ghc/rts/Linker.c

   1 /* -----------------------------------------------------------------------------
   2  *
   3  * (c) The GHC Team, 2000-2004
   4  *
   5  * RTS Object Linker
   6  *
   7  * ---------------------------------------------------------------------------*/
   8
   9 #if 0
  10 #include "PosixSource.h"
  11 #endif
  12
  13 /* Linux needs _GNU_SOURCE to get RTLD_DEFAULT from <dlfcn.h> and
  14    MREMAP_MAYMOVE from <sys/mman.h>.
  15  */
  16 #ifdef __linux__
  17 #define _GNU_SOURCE
  18 #endif
  19
  20 #include "Rts.h"
  21 #include "RtsFlags.h"
  22 #include "HsFFI.h"
  23 #include "Hash.h"
  24 #include "Linker.h"
  25 #include "LinkerInternals.h"
  26 #include "RtsUtils.h"
  27 #include "Schedule.h"
  28 #include "Storage.h"
  29
  30 #ifdef HAVE_SYS_TYPES_H
  31 #include <sys/types.h>
  32 #endif
  33
  34 #include <stdlib.h>
  35 #include <string.h>
  36
  37 #ifdef HAVE_SYS_STAT_H
  38 #include <sys/stat.h>
  39 #endif
  40
  41 #if defined(HAVE_DLFCN_H)
  42 #include <dlfcn.h>
  43 #endif
  44
  45 #if defined(cygwin32_HOST_OS)
  46 #ifdef HAVE_DIRENT_H
  47 #include <dirent.h>
  48 #endif
  49
  50 #ifdef HAVE_SYS_TIME_H
  51 #include <sys/time.h>
  52 #endif
  53 #include <regex.h>
  54 #include <sys/fcntl.h>
  55 #include <sys/termios.h>
  56 #include <sys/utime.h>
  57 #include <sys/utsname.h>
  58 #include <sys/wait.h>
  59 #endif
  60
  61 #if defined(ia64_HOST_ARCH) || defined(openbsd_HOST_OS) || defined(linux_HOST_OS) || defined(freebsd_HOST_OS)
  62 #define USE_MMAP
  63 #include <fcntl.h>
  64 #include <sys/mman.h>
  65
  66 #if defined(openbsd_HOST_OS) || defined(linux_HOST_OS) || defined(freebsd_HOST_OS)
  67 #ifdef HAVE_UNISTD_H
  68 #include <unistd.h>
  69 #endif
  70 #endif
  71
  72 #endif
  73
  74 #if defined(linux_HOST_OS) || defined(solaris2_HOST_OS) || defined(freebsd_HOST_OS) || defined(netbsd_HOST_OS) || defined(openbsd_HOST_OS)
  75 #  define OBJFORMAT_ELF
  76 #elif defined(cygwin32_HOST_OS) || defined (mingw32_HOST_OS)
  77 #  define OBJFORMAT_PEi386
  78 #  include <windows.h>
  79 #  include <math.h>
  80 #elif defined(darwin_HOST_OS)
  81 #  include <mach-o/ppc/reloc.h>
  82 #  define OBJFORMAT_MACHO
  83 #  include <mach-o/loader.h>
  84 #  include <mach-o/nlist.h>
  85 #  include <mach-o/reloc.h>
  86 #  include <mach-o/dyld.h>
  87 #endif
  88
  89 /* Hash table mapping symbol names to Symbol */
  90 static /*Str*/HashTable *symhash;
  91
  92 /* List of currently loaded objects */
  93 ObjectCode *objects = NULL;     /* initially empty */
  94
  95 #if defined(OBJFORMAT_ELF)
  96 static int ocVerifyImage_ELF    ( ObjectCode* oc );
  97 static int ocGetNames_ELF       ( ObjectCode* oc );
  98 static int ocResolve_ELF        ( ObjectCode* oc );
  99 #if defined(powerpc_HOST_ARCH)
 100 static int ocAllocateJumpIslands_ELF ( ObjectCode* oc );
 101 #endif
 102 #elif defined(OBJFORMAT_PEi386)
 103 static int ocVerifyImage_PEi386 ( ObjectCode* oc );
 104 static int ocGetNames_PEi386    ( ObjectCode* oc );
 105 static int ocResolve_PEi386     ( ObjectCode* oc );
 106 #elif defined(OBJFORMAT_MACHO)
 107 static int ocAllocateJumpIslands_MachO ( ObjectCode* oc );
 108 static int ocVerifyImage_MachO    ( ObjectCode* oc );
 109 static int ocGetNames_MachO       ( ObjectCode* oc );
 110 static int ocResolve_MachO        ( ObjectCode* oc );
 111
 112 static void machoInitSymbolsWithoutUnderscore( void );
 113 #endif
 114
 115 /* -----------------------------------------------------------------------------
 116  * Built-in symbols from the RTS
 117  */
 118
 119 typedef struct _RtsSymbolVal {
 120     char   *lbl;
 121     void   *addr;
 122 } RtsSymbolVal;
 123
 124
 125 #if !defined(PAR)
 126 #define Maybe_ForeignObj        SymX(mkForeignObjzh_fast)
 127
 128 #define Maybe_Stable_Names      SymX(mkWeakzh_fast)                     \
 129                                 SymX(makeStableNamezh_fast)             \
 130                                 SymX(finalizzeWeakzh_fast)
 131 #else
 132 /* These are not available in GUM!!! -- HWL */
 133 #define Maybe_ForeignObj
 134 #define Maybe_Stable_Names
 135 #endif
 136
 137 #if !defined (mingw32_HOST_OS)
 138 #define RTS_POSIX_ONLY_SYMBOLS                  \
 139       SymX(stg_sig_install)                     \
 140       Sym(nocldstop)
 141 #endif
 142
 143 #if defined (cygwin32_HOST_OS)
 144 #define RTS_MINGW_ONLY_SYMBOLS /**/
 145 /* Don't have the ability to read import libs / archives, so
 146  * we have to stupidly list a lot of what libcygwin.a
 147  * exports; sigh.
 148  */
 149 #define RTS_CYGWIN_ONLY_SYMBOLS                 \
 150       SymX(regfree)                             \
 151       SymX(regexec)                             \
 152       SymX(regerror)                            \
 153       SymX(regcomp)                             \
 154       SymX(__errno)                             \
 155       SymX(access)                              \
 156       SymX(chmod)                               \
 157       SymX(chdir)                               \
 158       SymX(close)                               \
 159       SymX(creat)                               \
 160       SymX(dup)                                 \
 161       SymX(dup2)                                \
 162       SymX(fstat)                               \
 163       SymX(fcntl)                               \
 164       SymX(getcwd)                              \
 165       SymX(getenv)                              \
 166       SymX(lseek)                               \
 167       SymX(open)                                \
 168       SymX(fpathconf)                           \
 169       SymX(pathconf)                            \
 170       SymX(stat)                                \
 171       SymX(pow)                                 \
 172       SymX(tanh)                                \
 173       SymX(cosh)                                \
 174       SymX(sinh)                                \
 175       SymX(atan)                                \
 176       SymX(acos)                                \
 177       SymX(asin)                                \
 178       SymX(tan)                                 \
 179       SymX(cos)                                 \
 180       SymX(sin)                                 \
 181       SymX(exp)                                 \
 182       SymX(log)                                 \
 183       SymX(sqrt)                                \
 184       SymX(localtime_r)                         \
 185       SymX(gmtime_r)                            \
 186       SymX(mktime)                              \
 187       Sym(_imp___tzname)                        \
 188       SymX(gettimeofday)                        \
 189       SymX(timezone)                            \
 190       SymX(tcgetattr)                           \
 191       SymX(tcsetattr)                           \
 192       SymX(memcpy)                              \
 193       SymX(memmove)                             \
 194       SymX(realloc)                             \
 195       SymX(malloc)                              \
 196       SymX(free)                                \
 197       SymX(fork)                                \
 198       SymX(lstat)                               \
 199       SymX(isatty)                              \
 200       SymX(mkdir)                               \
 201       SymX(opendir)                             \
 202       SymX(readdir)                             \
 203       SymX(rewinddir)                           \
 204       SymX(closedir)                            \
 205       SymX(link)                                \
 206       SymX(mkfifo)                              \
 207       SymX(pipe)                                \
 208       SymX(read)                                \
 209       SymX(rename)                              \
 210       SymX(rmdir)                               \
 211       SymX(select)                              \
 212       SymX(system)                              \
 213       SymX(write)                               \
 214       SymX(strcmp)                              \
 215       SymX(strcpy)                              \
 216       SymX(strncpy)                             \
 217       SymX(strerror)                            \
 218       SymX(sigaddset)                           \
 219       SymX(sigemptyset)                         \
 220       SymX(sigprocmask)                         \
 221       SymX(umask)                               \
 222       SymX(uname)                               \
 223       SymX(unlink)                              \
 224       SymX(utime)                               \
 225       SymX(waitpid)
 226
 227 #elif !defined(mingw32_HOST_OS)
 228 #define RTS_MINGW_ONLY_SYMBOLS /**/
 229 #define RTS_CYGWIN_ONLY_SYMBOLS /**/
 230 #else /* defined(mingw32_HOST_OS) */
 231 #define RTS_POSIX_ONLY_SYMBOLS  /**/
 232 #define RTS_CYGWIN_ONLY_SYMBOLS /**/
 233
 234 /* Extra syms gen'ed by mingw-2's gcc-3.2: */
 235 #if __GNUC__>=3
 236 #define RTS_MINGW_EXTRA_SYMS                    \
 237       Sym(_imp____mb_cur_max)                   \
 238       Sym(_imp___pctype)
 239 #else
 240 #define RTS_MINGW_EXTRA_SYMS
 241 #endif
 242
 243 /* These are statically linked from the mingw libraries into the ghc
 244    executable, so we have to employ this hack. */
 245 #define RTS_MINGW_ONLY_SYMBOLS                  \
 246       SymX(asyncReadzh_fast)                    \
 247       SymX(asyncWritezh_fast)                   \
 248       SymX(asyncDoProczh_fast)                  \
 249       SymX(memset)                              \
 250       SymX(inet_ntoa)                           \
 251       SymX(inet_addr)                           \
 252       SymX(htonl)                               \
 253       SymX(recvfrom)                            \
 254       SymX(listen)                              \
 255       SymX(bind)                                \
 256       SymX(shutdown)                            \
 257       SymX(connect)                             \
 258       SymX(htons)                               \
 259       SymX(ntohs)                               \
 260       SymX(getservbyname)                       \
 261       SymX(getservbyport)                       \
 262       SymX(getprotobynumber)                    \
 263       SymX(getprotobyname)                      \
 264       SymX(gethostbyname)                       \
 265       SymX(gethostbyaddr)                       \
 266       SymX(gethostname)                         \
 267       SymX(strcpy)                              \
 268       SymX(strncpy)                             \
 269       SymX(abort)                               \
 270       Sym(_alloca)                              \
 271       Sym(isxdigit)                             \
 272       Sym(isupper)                              \
 273       Sym(ispunct)                              \
 274       Sym(islower)                              \
 275       Sym(isspace)                              \
 276       Sym(isprint)                              \
 277       Sym(isdigit)                              \
 278       Sym(iscntrl)                              \
 279       Sym(isalpha)                              \
 280       Sym(isalnum)                              \
 281       SymX(strcmp)                              \
 282       SymX(memmove)                             \
 283       SymX(realloc)                             \
 284       SymX(malloc)                              \
 285       SymX(pow)                                 \
 286       SymX(tanh)                                \
 287       SymX(cosh)                                \
 288       SymX(sinh)                                \
 289       SymX(atan)                                \
 290       SymX(acos)                                \
 291       SymX(asin)                                \
 292       SymX(tan)                                 \
 293       SymX(cos)                                 \
 294       SymX(sin)                                 \
 295       SymX(exp)                                 \
 296       SymX(log)                                 \
 297       SymX(sqrt)                                \
 298       SymX(memcpy)                              \
 299       SymX(rts_InstallConsoleEvent)             \
 300       SymX(rts_ConsoleHandlerDone)              \
 301       Sym(mktime)                               \
 302       Sym(_imp___timezone)                      \
 303       Sym(_imp___tzname)                        \
 304       Sym(_imp___iob)                           \
 305       Sym(_imp___osver)                         \
 306       Sym(localtime)                            \
 307       Sym(gmtime)                               \
 308       Sym(opendir)                              \
 309       Sym(readdir)                              \
 310       Sym(rewinddir)                            \
 311       RTS_MINGW_EXTRA_SYMS                      \
 312       Sym(closedir)
 313 #endif
 314
 315 #ifndef SMP
 316 # define MAIN_CAP_SYM SymX(MainCapability)
 317 #else
 318 # define MAIN_CAP_SYM
 319 #endif
 320
 321 #if !defined(mingw32_HOST_OS)
 322 #define RTS_USER_SIGNALS_SYMBOLS \
 323    SymX(startSignalHandler) \
 324    SymX(setIOManagerPipe)
 325 #else
 326 #define RTS_USER_SIGNALS_SYMBOLS /* nothing */
 327 #endif
 328
 329 #ifdef TABLES_NEXT_TO_CODE
 330 #define RTS_RET_SYMBOLS /* nothing */
 331 #else
 332 #define RTS_RET_SYMBOLS                         \
 333       SymX(stg_enter_ret)                       \
 334       SymX(stg_gc_fun_ret)                      \
 335       SymX(stg_ap_0_ret)                        \
 336       SymX(stg_ap_v_ret)                        \
 337       SymX(stg_ap_f_ret)                        \
 338       SymX(stg_ap_d_ret)                        \
 339       SymX(stg_ap_l_ret)                        \
 340       SymX(stg_ap_n_ret)                        \
 341       SymX(stg_ap_p_ret)                        \
 342       SymX(stg_ap_pv_ret)                       \
 343       SymX(stg_ap_pp_ret)                       \
 344       SymX(stg_ap_ppv_ret)                      \
 345       SymX(stg_ap_ppp_ret)                      \
 346       SymX(stg_ap_pppv_ret)                     \
 347       SymX(stg_ap_pppp_ret)                     \
 348       SymX(stg_ap_ppppp_ret)                    \
 349       SymX(stg_ap_pppppp_ret)
 350 #endif
 351
 352 #define RTS_SYMBOLS                             \
 353       Maybe_ForeignObj                          \
 354       Maybe_Stable_Names                        \
 355       Sym(StgReturn)                            \
 356       SymX(stg_enter_info)                      \
 357       SymX(stg_gc_void_info)                    \
 358       SymX(__stg_gc_enter_1)                    \
 359       SymX(stg_gc_noregs)                       \
 360       SymX(stg_gc_unpt_r1_info)                 \
 361       SymX(stg_gc_unpt_r1)                      \
 362       SymX(stg_gc_unbx_r1_info)                 \
 363       SymX(stg_gc_unbx_r1)                      \
 364       SymX(stg_gc_f1_info)                      \
 365       SymX(stg_gc_f1)                           \
 366       SymX(stg_gc_d1_info)                      \
 367       SymX(stg_gc_d1)                           \
 368       SymX(stg_gc_l1_info)                      \
 369       SymX(stg_gc_l1)                           \
 370       SymX(__stg_gc_fun)                        \
 371       SymX(stg_gc_fun_info)                     \
 372       SymX(stg_gc_gen)                          \
 373       SymX(stg_gc_gen_info)                     \
 374       SymX(stg_gc_gen_hp)                       \
 375       SymX(stg_gc_ut)                           \
 376       SymX(stg_gen_yield)                       \
 377       SymX(stg_yield_noregs)                    \
 378       SymX(stg_yield_to_interpreter)            \
 379       SymX(stg_gen_block)                       \
 380       SymX(stg_block_noregs)                    \
 381       SymX(stg_block_1)                         \
 382       SymX(stg_block_takemvar)                  \
 383       SymX(stg_block_putmvar)                   \
 384       SymX(stg_seq_frame_info)                  \
 385       MAIN_CAP_SYM                              \
 386       SymX(MallocFailHook)                      \
 387       SymX(OnExitHook)                          \
 388       SymX(OutOfHeapHook)                       \
 389       SymX(StackOverflowHook)                   \
 390       SymX(__encodeDouble)                      \
 391       SymX(__encodeFloat)                       \
 392       SymX(addDLL)                              \
 393       SymX(__gmpn_gcd_1)                        \
 394       SymX(__gmpz_cmp)                          \
 395       SymX(__gmpz_cmp_si)                       \
 396       SymX(__gmpz_cmp_ui)                       \
 397       SymX(__gmpz_get_si)                       \
 398       SymX(__gmpz_get_ui)                       \
 399       SymX(__int_encodeDouble)                  \
 400       SymX(__int_encodeFloat)                   \
 401       SymX(andIntegerzh_fast)                   \
 402       SymX(atomicallyzh_fast)                   \
 403       SymX(barf)                                \
 404       SymX(debugBelch)                          \
 405       SymX(errorBelch)                          \
 406       SymX(blockAsyncExceptionszh_fast)         \
 407       SymX(catchzh_fast)                        \
 408       SymX(catchRetryzh_fast)                   \
 409       SymX(catchSTMzh_fast)                     \
 410       SymX(closure_flags)                       \
 411       SymX(cmp_thread)                          \
 412       SymX(cmpIntegerzh_fast)                   \
 413       SymX(cmpIntegerIntzh_fast)                \
 414       SymX(complementIntegerzh_fast)            \
 415       SymX(createAdjustor)                      \
 416       SymX(decodeDoublezh_fast)                 \
 417       SymX(decodeFloatzh_fast)                  \
 418       SymX(defaultsHook)                        \
 419       SymX(delayzh_fast)                        \
 420       SymX(deRefWeakzh_fast)                    \
 421       SymX(deRefStablePtrzh_fast)               \
 422       SymX(divExactIntegerzh_fast)              \
 423       SymX(divModIntegerzh_fast)                \
 424       SymX(forkzh_fast)                         \
 425       SymX(forkProcess)                         \
 426       SymX(forkOS_createThread)                 \
 427       SymX(freeHaskellFunctionPtr)              \
 428       SymX(freeStablePtr)                       \
 429       SymX(gcdIntegerzh_fast)                   \
 430       SymX(gcdIntegerIntzh_fast)                \
 431       SymX(gcdIntzh_fast)                       \
 432       SymX(genSymZh)                            \
 433       SymX(genericRaise)                        \
 434       SymX(getProgArgv)                         \
 435       SymX(getStablePtr)                        \
 436       SymX(hs_init)                             \
 437       SymX(hs_exit)                             \
 438       SymX(hs_set_argv)                         \
 439       SymX(hs_add_root)                         \
 440       SymX(hs_perform_gc)                       \
 441       SymX(hs_free_stable_ptr)                  \
 442       SymX(hs_free_fun_ptr)                     \
 443       SymX(initLinker)                          \
 444       SymX(int2Integerzh_fast)                  \
 445       SymX(integer2Intzh_fast)                  \
 446       SymX(integer2Wordzh_fast)                 \
 447       SymX(isCurrentThreadBoundzh_fast)         \
 448       SymX(isDoubleDenormalized)                \
 449       SymX(isDoubleInfinite)                    \
 450       SymX(isDoubleNaN)                         \
 451       SymX(isDoubleNegativeZero)                \
 452       SymX(isEmptyMVarzh_fast)                  \
 453       SymX(isFloatDenormalized)                 \
 454       SymX(isFloatInfinite)                     \
 455       SymX(isFloatNaN)                          \
 456       SymX(isFloatNegativeZero)                 \
 457       SymX(killThreadzh_fast)                   \
 458       SymX(loadObj)                             \
 459       SymX(lookupSymbol)                        \
 460       SymX(makeStablePtrzh_fast)                \
 461       SymX(minusIntegerzh_fast)                 \
 462       SymX(mkApUpd0zh_fast)                     \
 463       SymX(myThreadIdzh_fast)                   \
 464       SymX(labelThreadzh_fast)                  \
 465       SymX(newArrayzh_fast)                     \
 466       SymX(newBCOzh_fast)                       \
 467       SymX(newByteArrayzh_fast)                 \
 468       SymX_redirect(newCAF, newDynCAF)          \
 469       SymX(newMVarzh_fast)                      \
 470       SymX(newMutVarzh_fast)                    \
 471       SymX(newTVarzh_fast)                      \
 472       SymX(atomicModifyMutVarzh_fast)           \
 473       SymX(newPinnedByteArrayzh_fast)           \
 474       SymX(orIntegerzh_fast)                    \
 475       SymX(performGC)                           \
 476       SymX(performMajorGC)                      \
 477       SymX(plusIntegerzh_fast)                  \
 478       SymX(prog_argc)                           \
 479       SymX(prog_argv)                           \
 480       SymX(putMVarzh_fast)                      \
 481       SymX(quotIntegerzh_fast)                  \
 482       SymX(quotRemIntegerzh_fast)               \
 483       SymX(raisezh_fast)                        \
 484       SymX(raiseIOzh_fast)                      \
 485       SymX(readTVarzh_fast)                     \
 486       SymX(remIntegerzh_fast)                   \
 487       SymX(resetNonBlockingFd)                  \
 488       SymX(resumeThread)                        \
 489       SymX(resolveObjs)                         \
 490       SymX(retryzh_fast)                        \
 491       SymX(rts_apply)                           \
 492       SymX(rts_checkSchedStatus)                \
 493       SymX(rts_eval)                            \
 494       SymX(rts_evalIO)                          \
 495       SymX(rts_evalLazyIO)                      \
 496       SymX(rts_evalStableIO)                    \
 497       SymX(rts_eval_)                           \
 498       SymX(rts_getBool)                         \
 499       SymX(rts_getChar)                         \
 500       SymX(rts_getDouble)                       \
 501       SymX(rts_getFloat)                        \
 502       SymX(rts_getInt)                          \
 503       SymX(rts_getInt32)                        \
 504       SymX(rts_getPtr)                          \
 505       SymX(rts_getFunPtr)                       \
 506       SymX(rts_getStablePtr)                    \
 507       SymX(rts_getThreadId)                     \
 508       SymX(rts_getWord)                         \
 509       SymX(rts_getWord32)                       \
 510       SymX(rts_lock)                            \
 511       SymX(rts_mkBool)                          \
 512       SymX(rts_mkChar)                          \
 513       SymX(rts_mkDouble)                        \
 514       SymX(rts_mkFloat)                         \
 515       SymX(rts_mkInt)                           \
 516       SymX(rts_mkInt16)                         \
 517       SymX(rts_mkInt32)                         \
 518       SymX(rts_mkInt64)                         \
 519       SymX(rts_mkInt8)                          \
 520       SymX(rts_mkPtr)                           \
 521       SymX(rts_mkFunPtr)                        \
 522       SymX(rts_mkStablePtr)                     \
 523       SymX(rts_mkString)                        \
 524       SymX(rts_mkWord)                          \
 525       SymX(rts_mkWord16)                        \
 526       SymX(rts_mkWord32)                        \
 527       SymX(rts_mkWord64)                        \
 528       SymX(rts_mkWord8)                         \
 529       SymX(rts_unlock)                          \
 530       SymX(rtsSupportsBoundThreads)             \
 531       SymX(run_queue_hd)                        \
 532       SymX(__hscore_get_saved_termios)          \
 533       SymX(__hscore_set_saved_termios)          \
 534       SymX(setProgArgv)                         \
 535       SymX(startupHaskell)                      \
 536       SymX(shutdownHaskell)                     \
 537       SymX(shutdownHaskellAndExit)              \
 538       SymX(stable_ptr_table)                    \
 539       SymX(stackOverflow)                       \
 540       SymX(stg_CAF_BLACKHOLE_info)              \
 541       SymX(awakenBlockedQueue)                  \
 542       SymX(stg_CHARLIKE_closure)                \
 543       SymX(stg_EMPTY_MVAR_info)                 \
 544       SymX(stg_IND_STATIC_info)                 \
 545       SymX(stg_INTLIKE_closure)                 \
 546       SymX(stg_MUT_ARR_PTRS_FROZEN_info)        \
 547       SymX(stg_MUT_ARR_PTRS_FROZEN0_info)       \
 548       SymX(stg_WEAK_info)                       \
 549       SymX(stg_ap_0_info)                       \
 550       SymX(stg_ap_v_info)                       \
 551       SymX(stg_ap_f_info)                       \
 552       SymX(stg_ap_d_info)                       \
 553       SymX(stg_ap_l_info)                       \
 554       SymX(stg_ap_n_info)                       \
 555       SymX(stg_ap_p_info)                       \
 556       SymX(stg_ap_pv_info)                      \
 557       SymX(stg_ap_pp_info)                      \
 558       SymX(stg_ap_ppv_info)                     \
 559       SymX(stg_ap_ppp_info)                     \
 560       SymX(stg_ap_pppv_info)                    \
 561       SymX(stg_ap_pppp_info)                    \
 562       SymX(stg_ap_ppppp_info)                   \
 563       SymX(stg_ap_pppppp_info)                  \
 564       SymX(stg_ap_1_upd_info)                   \
 565       SymX(stg_ap_2_upd_info)                   \
 566       SymX(stg_ap_3_upd_info)                   \
 567       SymX(stg_ap_4_upd_info)                   \
 568       SymX(stg_ap_5_upd_info)                   \
 569       SymX(stg_ap_6_upd_info)                   \
 570       SymX(stg_ap_7_upd_info)                   \
 571       SymX(stg_exit)                            \
 572       SymX(stg_sel_0_upd_info)                  \
 573       SymX(stg_sel_10_upd_info)                 \
 574       SymX(stg_sel_11_upd_info)                 \
 575       SymX(stg_sel_12_upd_info)                 \
 576       SymX(stg_sel_13_upd_info)                 \
 577       SymX(stg_sel_14_upd_info)                 \
 578       SymX(stg_sel_15_upd_info)                 \
 579       SymX(stg_sel_1_upd_info)                  \
 580       SymX(stg_sel_2_upd_info)                  \
 581       SymX(stg_sel_3_upd_info)                  \
 582       SymX(stg_sel_4_upd_info)                  \
 583       SymX(stg_sel_5_upd_info)                  \
 584       SymX(stg_sel_6_upd_info)                  \
 585       SymX(stg_sel_7_upd_info)                  \
 586       SymX(stg_sel_8_upd_info)                  \
 587       SymX(stg_sel_9_upd_info)                  \
 588       SymX(stg_upd_frame_info)                  \
 589       SymX(suspendThread)                       \
 590       SymX(takeMVarzh_fast)                     \
 591       SymX(timesIntegerzh_fast)                 \
 592       SymX(tryPutMVarzh_fast)                   \
 593       SymX(tryTakeMVarzh_fast)                  \
 594       SymX(unblockAsyncExceptionszh_fast)       \
 595       SymX(unloadObj)                           \
 596       SymX(unsafeThawArrayzh_fast)              \
 597       SymX(waitReadzh_fast)                     \
 598       SymX(waitWritezh_fast)                    \
 599       SymX(word2Integerzh_fast)                 \
 600       SymX(writeTVarzh_fast)                    \
 601       SymX(xorIntegerzh_fast)                   \
 602       SymX(yieldzh_fast)                        \
 603       RTS_USER_SIGNALS_SYMBOLS
 604
 605 #ifdef SUPPORT_LONG_LONGS
 606 #define RTS_LONG_LONG_SYMS                      \
 607       SymX(int64ToIntegerzh_fast)               \
 608       SymX(word64ToIntegerzh_fast)
 609 #else
 610 #define RTS_LONG_LONG_SYMS /* nothing */
 611 #endif
 612
 613 // 64-bit support functions in libgcc.a
 614 #if defined(__GNUC__) && SIZEOF_VOID_P <= 4
 615 #define RTS_LIBGCC_SYMBOLS                      \
 616       Sym(__divdi3)                             \
 617       Sym(__udivdi3)                            \
 618       Sym(__moddi3)                             \
 619       Sym(__umoddi3)                            \
 620       Sym(__muldi3)                             \
 621       Sym(__ashldi3)                            \
 622       Sym(__ashrdi3)                            \
 623       Sym(__lshrdi3)                            \
 624       Sym(__eprintf)
 625 #elif defined(ia64_HOST_ARCH)
 626 #define RTS_LIBGCC_SYMBOLS                      \
 627       Sym(__divdi3)                             \
 628       Sym(__udivdi3)                            \
 629       Sym(__moddi3)                             \
 630       Sym(__umoddi3)                            \
 631       Sym(__divsf3)                             \
 632       Sym(__divdf3)
 633 #else
 634 #define RTS_LIBGCC_SYMBOLS
 635 #endif
 636
 637 #ifdef darwin_HOST_OS
 638       // Symbols that don't have a leading underscore
 639       // on Mac OS X. They have to receive special treatment,
 640       // see machoInitSymbolsWithoutUnderscore()
 641 #define RTS_MACHO_NOUNDERLINE_SYMBOLS           \
 642       Sym(saveFP)                               \
 643       Sym(restFP)
 644 #endif
 645
 646 /* entirely bogus claims about types of these symbols */
 647 #define Sym(vvv)  extern void vvv(void);
 648 #define SymX(vvv) /**/
 649 #define SymX_redirect(vvv,xxx) /**/
 650 RTS_SYMBOLS
 651 RTS_RET_SYMBOLS
 652 RTS_LONG_LONG_SYMS
 653 RTS_POSIX_ONLY_SYMBOLS
 654 RTS_MINGW_ONLY_SYMBOLS
 655 RTS_CYGWIN_ONLY_SYMBOLS
 656 RTS_LIBGCC_SYMBOLS
 657 #undef Sym
 658 #undef SymX
 659 #undef SymX_redirect
 660
 661 #ifdef LEADING_UNDERSCORE
 662 #define MAYBE_LEADING_UNDERSCORE_STR(s) ("_" s)
 663 #else
 664 #define MAYBE_LEADING_UNDERSCORE_STR(s) (s)
 665 #endif
 666
 667 #define Sym(vvv) { MAYBE_LEADING_UNDERSCORE_STR(#vvv), \
 668                     (void*)(&(vvv)) },
 669 #define SymX(vvv) Sym(vvv)
 670
 671 // SymX_redirect allows us to redirect references to one symbol to
 672 // another symbol.  See newCAF/newDynCAF for an example.
 673 #define SymX_redirect(vvv,xxx) \
 674     { MAYBE_LEADING_UNDERSCORE_STR(#vvv), \
 675       (void*)(&(xxx)) },
 676
 677 static RtsSymbolVal rtsSyms[] = {
 678       RTS_SYMBOLS
 679       RTS_RET_SYMBOLS
 680       RTS_LONG_LONG_SYMS
 681       RTS_POSIX_ONLY_SYMBOLS
 682       RTS_MINGW_ONLY_SYMBOLS
 683       RTS_CYGWIN_ONLY_SYMBOLS
 684       RTS_LIBGCC_SYMBOLS
 685       { 0, 0 } /* sentinel */
 686 };
 687
 688 /* -----------------------------------------------------------------------------
 689  * Insert symbols into hash tables, checking for duplicates.
 690  */
 691 static void ghciInsertStrHashTable ( char* obj_name,
 692                                      HashTable *table,
 693                                      char* key,
 694                                      void *data
 695                                    )
 696 {
 697    if (lookupHashTable(table, (StgWord)key) == NULL)
 698    {
 699       insertStrHashTable(table, (StgWord)key, data);
 700       return;
 701    }
 702    debugBelch(
 703       "\n\n"
 704       "GHCi runtime linker: fatal error: I found a duplicate definition for symbol\n"
 705       "   %s\n"
 706       "whilst processing object file\n"
 707       "   %s\n"
 708       "This could be caused by:\n"
 709       "   * Loading two different object files which export the same symbol\n"
 710       "   * Specifying the same object file twice on the GHCi command line\n"
 711       "   * An incorrect `package.conf' entry, causing some object to be\n"
 712       "     loaded twice.\n"
 713       "GHCi cannot safely continue in this situation.  Exiting now.  Sorry.\n"
 714       "\n",
 715       (char*)key,
 716       obj_name
 717    );
 718    exit(1);
 719 }
 720
 721
 722 /* -----------------------------------------------------------------------------
 723  * initialize the object linker
 724  */
 725
 726
 727 static int linker_init_done = 0 ;
 728
 729 #if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
 730 static void *dl_prog_handle;
 731 #endif
 732
 733 /* dlopen(NULL,..) doesn't work so we grab libc explicitly */
 734 #if defined(openbsd_HOST_OS)
 735 static void *dl_libc_handle;
 736 #endif
 737
 738 void
 739 initLinker( void )
 740 {
 741     RtsSymbolVal *sym;
 742
 743     /* Make initLinker idempotent, so we can call it
 744        before evey relevant operation; that means we
 745        don't need to initialise the linker separately */
 746     if (linker_init_done == 1) { return; } else {
 747       linker_init_done = 1;
 748     }
 749
 750     symhash = allocStrHashTable();
 751
 752     /* populate the symbol table with stuff from the RTS */
 753     for (sym = rtsSyms; sym->lbl != NULL; sym++) {
 754         ghciInsertStrHashTable("(GHCi built-in symbols)",
 755                                symhash, sym->lbl, sym->addr);
 756     }
 757 #   if defined(OBJFORMAT_MACHO)
 758     machoInitSymbolsWithoutUnderscore();
 759 #   endif
 760
 761 #   if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
 762 #   if defined(RTLD_DEFAULT)
 763     dl_prog_handle = RTLD_DEFAULT;
 764 #   else
 765     dl_prog_handle = dlopen(NULL, RTLD_LAZY);
 766 #   if defined(openbsd_HOST_OS)
 767     dl_libc_handle = dlopen("libc.so", RTLD_LAZY);
 768 #   endif
 769 #   endif /* RTLD_DEFAULT */
 770 #   endif
 771 }
 772
 773 /* -----------------------------------------------------------------------------
 774  *                  Loading DLL or .so dynamic libraries
 775  * -----------------------------------------------------------------------------
 776  *
 777  * Add a DLL from which symbols may be found.  In the ELF case, just
 778  * do RTLD_GLOBAL-style add, so no further messing around needs to
 779  * happen in order that symbols in the loaded .so are findable --
 780  * lookupSymbol() will subsequently see them by dlsym on the program's
 781  * dl-handle.  Returns NULL if success, otherwise ptr to an err msg.
 782  *
 783  * In the PEi386 case, open the DLLs and put handles to them in a
 784  * linked list.  When looking for a symbol, try all handles in the
 785  * list.  This means that we need to load even DLLs that are guaranteed
 786  * to be in the ghc.exe image already, just so we can get a handle
 787  * to give to loadSymbol, so that we can find the symbols.  For such
 788  * libraries, the LoadLibrary call should be a no-op except for returning
 789  * the handle.
 790  *
 791  */
 792
 793 #if defined(OBJFORMAT_PEi386)
 794 /* A record for storing handles into DLLs. */
 795
 796 typedef
 797    struct _OpenedDLL {
 798       char*              name;
 799       struct _OpenedDLL* next;
 800       HINSTANCE instance;
 801    }
 802    OpenedDLL;
 803
 804 /* A list thereof. */
 805 static OpenedDLL* opened_dlls = NULL;
 806 #endif
 807
 808 char *
 809 addDLL( char *dll_name )
 810 {
 811 #  if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
 812    /* ------------------- ELF DLL loader ------------------- */
 813    void *hdl;
 814    char *errmsg;
 815
 816    initLinker();
 817
 818    hdl= dlopen(dll_name, RTLD_NOW | RTLD_GLOBAL);
 819
 820    if (hdl == NULL) {
 821       /* dlopen failed; return a ptr to the error msg. */
 822       errmsg = dlerror();
 823       if (errmsg == NULL) errmsg = "addDLL: unknown error";
 824       return errmsg;
 825    } else {
 826       return NULL;
 827    }
 828    /*NOTREACHED*/
 829
 830 #  elif defined(OBJFORMAT_PEi386)
 831    /* ------------------- Win32 DLL loader ------------------- */
 832
 833    char*      buf;
 834    OpenedDLL* o_dll;
 835    HINSTANCE  instance;
 836
 837    initLinker();
 838
 839    /* debugBelch("\naddDLL; dll_name = `%s'\n", dll_name); */
 840
 841    /* See if we've already got it, and ignore if so. */
 842    for (o_dll = opened_dlls; o_dll != NULL; o_dll = o_dll->next) {
 843       if (0 == strcmp(o_dll->name, dll_name))
 844          return NULL;
 845    }
 846
 847    /* The file name has no suffix (yet) so that we can try
 848       both foo.dll and foo.drv
 849
 850       The documentation for LoadLibrary says:
 851         If no file name extension is specified in the lpFileName
 852         parameter, the default library extension .dll is
 853         appended. However, the file name string can include a trailing
 854         point character (.) to indicate that the module name has no
 855         extension. */
 856
 857    buf = stgMallocBytes(strlen(dll_name) + 10, "addDLL");
 858    sprintf(buf, "%s.DLL", dll_name);
 859    instance = LoadLibrary(buf);
 860    if (instance == NULL) {
 861          sprintf(buf, "%s.DRV", dll_name);      // KAA: allow loading of drivers (like winspool.drv)
 862          instance = LoadLibrary(buf);
 863          if (instance == NULL) {
 864                 stgFree(buf);
 865
 866             /* LoadLibrary failed; return a ptr to the error msg. */
 867             return "addDLL: unknown error";
 868          }
 869    }
 870    stgFree(buf);
 871
 872    /* Add this DLL to the list of DLLs in which to search for symbols. */
 873    o_dll = stgMallocBytes( sizeof(OpenedDLL), "addDLL" );
 874    o_dll->name     = stgMallocBytes(1+strlen(dll_name), "addDLL");
 875    strcpy(o_dll->name, dll_name);
 876    o_dll->instance = instance;
 877    o_dll->next     = opened_dlls;
 878    opened_dlls     = o_dll;
 879
 880    return NULL;
 881 #  else
 882    barf("addDLL: not implemented on this platform");
 883 #  endif
 884 }
 885
 886 /* -----------------------------------------------------------------------------
 887  * lookup a symbol in the hash table
 888  */
 889 void *
 890 lookupSymbol( char *lbl )
 891 {
 892     void *val;
 893     initLinker() ;
 894     ASSERT(symhash != NULL);
 895     val = lookupStrHashTable(symhash, lbl);
 896
 897     if (val == NULL) {
 898 #       if defined(OBJFORMAT_ELF)
 899 #       if defined(openbsd_HOST_OS)
 900         val = dlsym(dl_prog_handle, lbl);
 901         return (val != NULL) ? val : dlsym(dl_libc_handle,lbl);
 902 #       else /* not openbsd */
 903         return dlsym(dl_prog_handle, lbl);
 904 #       endif
 905 #       elif defined(OBJFORMAT_MACHO)
 906         if(NSIsSymbolNameDefined(lbl)) {
 907             NSSymbol symbol = NSLookupAndBindSymbol(lbl);
 908             return NSAddressOfSymbol(symbol);
 909         } else {
 910             return NULL;
 911         }
 912 #       elif defined(OBJFORMAT_PEi386)
 913         OpenedDLL* o_dll;
 914         void* sym;
 915         for (o_dll = opened_dlls; o_dll != NULL; o_dll = o_dll->next) {
 916           /* debugBelch("look in %s for %s\n", o_dll->name, lbl); */
 917            if (lbl[0] == '_') {
 918               /* HACK: if the name has an initial underscore, try stripping
 919                  it off & look that up first. I've yet to verify whether there's
 920                  a Rule that governs whether an initial '_' *should always* be
 921                  stripped off when mapping from import lib name to the DLL name.
 922               */
 923               sym = GetProcAddress(o_dll->instance, (lbl+1));
 924               if (sym != NULL) {
 925                 /*debugBelch("found %s in %s\n", lbl+1,o_dll->name);*/
 926                 return sym;
 927               }
 928            }
 929            sym = GetProcAddress(o_dll->instance, lbl);
 930            if (sym != NULL) {
 931              /*debugBelch("found %s in %s\n", lbl,o_dll->name);*/
 932              return sym;
 933            }
 934         }
 935         return NULL;
 936 #       else
 937         ASSERT(2+2 == 5);
 938         return NULL;
 939 #       endif
 940     } else {
 941         return val;
 942     }
 943 }
 944
 945 static
 946 __attribute((unused))
 947 void *
 948 lookupLocalSymbol( ObjectCode* oc, char *lbl )
 949 {
 950     void *val;
 951     initLinker() ;
 952     val = lookupStrHashTable(oc->lochash, lbl);
 953
 954     if (val == NULL) {
 955         return NULL;
 956     } else {
 957         return val;
 958     }
 959 }
 960
 961
 962 /* -----------------------------------------------------------------------------
 963  * Debugging aid: look in GHCi's object symbol tables for symbols
 964  * within DELTA bytes of the specified address, and show their names.
 965  */
 966 #ifdef DEBUG
 967 void ghci_enquire ( char* addr );
 968
 969 void ghci_enquire ( char* addr )
 970 {
 971    int   i;
 972    char* sym;
 973    char* a;
 974    const int DELTA = 64;
 975    ObjectCode* oc;
 976
 977    initLinker();
 978
 979    for (oc = objects; oc; oc = oc->next) {
 980       for (i = 0; i < oc->n_symbols; i++) {
 981          sym = oc->symbols[i];
 982          if (sym == NULL) continue;
 983          // debugBelch("enquire %p %p\n", sym, oc->lochash);
 984          a = NULL;
 985          if (oc->lochash != NULL) {
 986             a = lookupStrHashTable(oc->lochash, sym);
 987          }
 988          if (a == NULL) {
 989             a = lookupStrHashTable(symhash, sym);
 990          }
 991          if (a == NULL) {
 992              // debugBelch("ghci_enquire: can't find %s\n", sym);
 993          }
 994          else if (addr-DELTA <= a && a <= addr+DELTA) {
 995             debugBelch("%p + %3d  ==  `%s'\n", addr, a - addr, sym);
 996          }
 997       }
 998    }
 999 }
1000 #endif
1001
1002 #ifdef ia64_HOST_ARCH
1003 static unsigned int PLTSize(void);
1004 #endif
1005
1006 /* -----------------------------------------------------------------------------
1007  * Load an obj (populate the global symbol table, but don't resolve yet)
1008  *
1009  * Returns: 1 if ok, 0 on error.
1010  */
1011 HsInt
1012 loadObj( char *path )
1013 {
1014    ObjectCode* oc;
1015    struct stat st;
1016    int r, n;
1017 #ifdef USE_MMAP
1018    int fd, pagesize;
1019    void *map_addr = NULL;
1020 #else
1021    FILE *f;
1022 #endif
1023
1024    initLinker();
1025
1026    /* debugBelch("loadObj %s\n", path ); */
1027
1028    /* Check that we haven't already loaded this object.
1029       Ignore requests to load multiple times */
1030    {
1031        ObjectCode *o;
1032        int is_dup = 0;
1033        for (o = objects; o; o = o->next) {
1034           if (0 == strcmp(o->fileName, path)) {
1035              is_dup = 1;
1036              break; /* don't need to search further */
1037           }
1038        }
1039        if (is_dup) {
1040           IF_DEBUG(linker, debugBelch(
1041             "GHCi runtime linker: warning: looks like you're trying to load the\n"
1042             "same object file twice:\n"
1043             "   %s\n"
1044             "GHCi will ignore this, but be warned.\n"
1045             , path));
1046           return 1; /* success */
1047        }
1048    }
1049
1050    oc = stgMallocBytes(sizeof(ObjectCode), "loadObj(oc)");
1051
1052 #  if defined(OBJFORMAT_ELF)
1053    oc->formatName = "ELF";
1054 #  elif defined(OBJFORMAT_PEi386)
1055    oc->formatName = "PEi386";
1056 #  elif defined(OBJFORMAT_MACHO)
1057    oc->formatName = "Mach-O";
1058 #  else
1059    stgFree(oc);
1060    barf("loadObj: not implemented on this platform");
1061 #  endif
1062
1063    r = stat(path, &st);
1064    if (r == -1) { return 0; }
1065
1066    /* sigh, strdup() isn't a POSIX function, so do it the long way */
1067    oc->fileName = stgMallocBytes( strlen(path)+1, "loadObj" );
1068    strcpy(oc->fileName, path);
1069
1070    oc->fileSize          = st.st_size;
1071    oc->symbols           = NULL;
1072    oc->sections          = NULL;
1073    oc->lochash           = allocStrHashTable();
1074    oc->proddables        = NULL;
1075
1076    /* chain it onto the list of objects */
1077    oc->next              = objects;
1078    objects               = oc;
1079
1080 #ifdef USE_MMAP
1081 #define ROUND_UP(x,size) ((x + size - 1) & ~(size - 1))
1082
1083    /* On many architectures malloc'd memory isn't executable, so we need to use mmap. */
1084
1085 #if defined(openbsd_HOST_OS)
1086    fd = open(path, O_RDONLY, S_IRUSR);
1087 #else
1088    fd = open(path, O_RDONLY);
1089 #endif
1090    if (fd == -1)
1091       barf("loadObj: can't open `%s'", path);
1092
1093    pagesize = getpagesize();
1094
1095 #ifdef ia64_HOST_ARCH
1096    /* The PLT needs to be right before the object */
1097    n = ROUND_UP(PLTSize(), pagesize);
1098    oc->plt = mmap(NULL, n, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
1099    if (oc->plt == MAP_FAILED)
1100       barf("loadObj: can't allocate PLT");
1101
1102    oc->pltIndex = 0;
1103    map_addr = oc->plt + n;
1104 #endif
1105
1106    n = ROUND_UP(oc->fileSize, pagesize);
1107
1108    /* Link objects into the lower 2Gb on x86_64.  GHC assumes the
1109     * small memory model on this architecture (see gcc docs,
1110     * -mcmodel=small).
1111     */
1112 #ifdef x86_64_HOST_ARCH
1113 #define EXTRA_MAP_FLAGS MAP_32BIT
1114 #else
1115 #define EXTRA_MAP_FLAGS 0
1116 #endif
1117
1118    oc->image = mmap(map_addr, n, PROT_EXEC|PROT_READ|PROT_WRITE,
1119                     MAP_PRIVATE|EXTRA_MAP_FLAGS, fd, 0);
1120    if (oc->image == MAP_FAILED)
1121       barf("loadObj: can't map `%s'", path);
1122
1123    close(fd);
1124
1125 #else /* !USE_MMAP */
1126
1127    oc->image = stgMallocBytes(oc->fileSize, "loadObj(image)");
1128
1129    /* load the image into memory */
1130    f = fopen(path, "rb");
1131    if (!f)
1132        barf("loadObj: can't read `%s'", path);
1133
1134    n = fread ( oc->image, 1, oc->fileSize, f );
1135    if (n != oc->fileSize)
1136       barf("loadObj: error whilst reading `%s'", path);
1137
1138    fclose(f);
1139
1140 #endif /* USE_MMAP */
1141
1142 #  if defined(OBJFORMAT_MACHO)
1143    r = ocAllocateJumpIslands_MachO ( oc );
1144    if (!r) { return r; }
1145 #  elif defined(OBJFORMAT_ELF) && defined(powerpc_HOST_ARCH)
1146    r = ocAllocateJumpIslands_ELF ( oc );
1147    if (!r) { return r; }
1148 #endif
1149
1150    /* verify the in-memory image */
1151 #  if defined(OBJFORMAT_ELF)
1152    r = ocVerifyImage_ELF ( oc );
1153 #  elif defined(OBJFORMAT_PEi386)
1154    r = ocVerifyImage_PEi386 ( oc );
1155 #  elif defined(OBJFORMAT_MACHO)
1156    r = ocVerifyImage_MachO ( oc );
1157 #  else
1158    barf("loadObj: no verify method");
1159 #  endif
1160    if (!r) { return r; }
1161
1162    /* build the symbol list for this image */
1163 #  if defined(OBJFORMAT_ELF)
1164    r = ocGetNames_ELF ( oc );
1165 #  elif defined(OBJFORMAT_PEi386)
1166    r = ocGetNames_PEi386 ( oc );
1167 #  elif defined(OBJFORMAT_MACHO)
1168    r = ocGetNames_MachO ( oc );
1169 #  else
1170    barf("loadObj: no getNames method");
1171 #  endif
1172    if (!r) { return r; }
1173
1174    /* loaded, but not resolved yet */
1175    oc->status = OBJECT_LOADED;
1176
1177    return 1;
1178 }
1179
1180 /* -----------------------------------------------------------------------------
1181  * resolve all the currently unlinked objects in memory
1182  *
1183  * Returns: 1 if ok, 0 on error.
1184  */
1185 HsInt
1186 resolveObjs( void )
1187 {
1188     ObjectCode *oc;
1189     int r;
1190
1191     initLinker();
1192
1193     for (oc = objects; oc; oc = oc->next) {
1194         if (oc->status != OBJECT_RESOLVED) {
1195 #           if defined(OBJFORMAT_ELF)
1196             r = ocResolve_ELF ( oc );
1197 #           elif defined(OBJFORMAT_PEi386)
1198             r = ocResolve_PEi386 ( oc );
1199 #           elif defined(OBJFORMAT_MACHO)
1200             r = ocResolve_MachO ( oc );
1201 #           else
1202             barf("resolveObjs: not implemented on this platform");
1203 #           endif
1204             if (!r) { return r; }
1205             oc->status = OBJECT_RESOLVED;
1206         }
1207     }
1208     return 1;
1209 }
1210
1211 /* -----------------------------------------------------------------------------
1212  * delete an object from the pool
1213  */
1214 HsInt
1215 unloadObj( char *path )
1216 {
1217     ObjectCode *oc, *prev;
1218
1219     ASSERT(symhash != NULL);
1220     ASSERT(objects != NULL);
1221
1222     initLinker();
1223
1224     prev = NULL;
1225     for (oc = objects; oc; prev = oc, oc = oc->next) {
1226         if (!strcmp(oc->fileName,path)) {
1227
1228             /* Remove all the mappings for the symbols within this
1229              * object..
1230              */
1231             {
1232                 int i;
1233                 for (i = 0; i < oc->n_symbols; i++) {
1234                    if (oc->symbols[i] != NULL) {
1235                        removeStrHashTable(symhash, oc->symbols[i], NULL);
1236                    }
1237                 }
1238             }
1239
1240             if (prev == NULL) {
1241                 objects = oc->next;
1242             } else {
1243                 prev->next = oc->next;
1244             }
1245
1246             /* We're going to leave this in place, in case there are
1247                any pointers from the heap into it: */
1248             /* stgFree(oc->image); */
1249             stgFree(oc->fileName);
1250             stgFree(oc->symbols);
1251             stgFree(oc->sections);
1252             /* The local hash table should have been freed at the end
1253                of the ocResolve_ call on it. */
1254             ASSERT(oc->lochash == NULL);
1255             stgFree(oc);
1256             return 1;
1257         }
1258     }
1259
1260     errorBelch("unloadObj: can't find `%s' to unload", path);
1261     return 0;
1262 }
1263
1264 /* -----------------------------------------------------------------------------
1265  * Sanity checking.  For each ObjectCode, maintain a list of address ranges
1266  * which may be prodded during relocation, and abort if we try and write
1267  * outside any of these.
1268  */
1269 static void addProddableBlock ( ObjectCode* oc, void* start, int size )
1270 {
1271    ProddableBlock* pb
1272       = stgMallocBytes(sizeof(ProddableBlock), "addProddableBlock");
1273    /* debugBelch("aPB %p %p %d\n", oc, start, size); */
1274    ASSERT(size > 0);
1275    pb->start      = start;
1276    pb->size       = size;
1277    pb->next       = oc->proddables;
1278    oc->proddables = pb;
1279 }
1280
1281 static void checkProddableBlock ( ObjectCode* oc, void* addr )
1282 {
1283    ProddableBlock* pb;
1284    for (pb = oc->proddables; pb != NULL; pb = pb->next) {
1285       char* s = (char*)(pb->start);
1286       char* e = s + pb->size - 1;
1287       char* a = (char*)addr;
1288       /* Assumes that the biggest fixup involves a 4-byte write.  This
1289          probably needs to be changed to 8 (ie, +7) on 64-bit
1290          plats. */
1291       if (a >= s && (a+3) <= e) return;
1292    }
1293    barf("checkProddableBlock: invalid fixup in runtime linker");
1294 }
1295
1296 /* -----------------------------------------------------------------------------
1297  * Section management.
1298  */
1299 static void addSection ( ObjectCode* oc, SectionKind kind,
1300                          void* start, void* end )
1301 {
1302    Section* s   = stgMallocBytes(sizeof(Section), "addSection");
1303    s->start     = start;
1304    s->end       = end;
1305    s->kind      = kind;
1306    s->next      = oc->sections;
1307    oc->sections = s;
1308    /*
1309    debugBelch("addSection: %p-%p (size %d), kind %d\n",
1310                    start, ((char*)end)-1, end - start + 1, kind );
1311    */
1312 }
1313
1314
1315 /* --------------------------------------------------------------------------
1316  * PowerPC specifics (jump islands)
1317  * ------------------------------------------------------------------------*/
1318
1319 #if defined(powerpc_HOST_ARCH)
1320
1321 /*
1322   ocAllocateJumpIslands
1323
1324   Allocate additional space at the end of the object file image to make room
1325   for jump islands.
1326
1327   PowerPC relative branch instructions have a 24 bit displacement field.
1328   As PPC code is always 4-byte-aligned, this yields a +-32MB range.
1329   If a particular imported symbol is outside this range, we have to redirect
1330   the jump to a short piece of new code that just loads the 32bit absolute
1331   address and jumps there.
1332   This function just allocates space for one 16 byte ppcJumpIsland for every
1333   undefined symbol in the object file. The code for the islands is filled in by
1334   makeJumpIsland below.
1335 */
1336
1337 static int ocAllocateJumpIslands( ObjectCode* oc, int count, int first )
1338 {
1339 #ifdef USE_MMAP
1340   int pagesize, n, m;
1341 #endif
1342   int aligned;
1343
1344   if( count > 0 )
1345   {
1346     // round up to the nearest 4
1347     aligned = (oc->fileSize + 3) & ~3;
1348
1349 #ifdef USE_MMAP
1350     #ifndef linux_HOST_OS /* mremap is a linux extension */
1351         #error ocAllocateJumpIslands doesnt want USE_MMAP to be defined
1352     #endif
1353
1354     pagesize = getpagesize();
1355     n = ROUND_UP( oc->fileSize, pagesize );
1356     m = ROUND_UP( aligned + sizeof (ppcJumpIsland) * count, pagesize );
1357
1358     /* The effect of this mremap() call is only the ensure that we have
1359      * a sufficient number of virtually contiguous pages.  As returned from
1360      * mremap, the pages past the end of the file are not backed.  We give
1361      * them a backing by using MAP_FIXED to map in anonymous pages.
1362      */
1363     if( (oc->image = mremap( oc->image, n, m, MREMAP_MAYMOVE )) == MAP_FAILED )
1364     {
1365       errorBelch( "Unable to mremap for Jump Islands\n" );
1366       return 0;
1367     }
1368
1369     if( mmap( oc->image + n, m - n, PROT_READ | PROT_WRITE | PROT_EXEC,
1370               MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED, 0, 0 ) == MAP_FAILED )
1371     {
1372       errorBelch( "Unable to mmap( MAP_FIXED ) for Jump Islands\n" );
1373       return 0;
1374     }
1375
1376 #else
1377     oc->image = stgReallocBytes( oc->image,
1378                                  aligned + sizeof (ppcJumpIsland) * count,
1379                                  "ocAllocateJumpIslands" );
1380 #endif /* USE_MMAP */
1381
1382     oc->jump_islands = (ppcJumpIsland *) (oc->image + aligned);
1383     memset( oc->jump_islands, 0, sizeof (ppcJumpIsland) * count );
1384   }
1385   else
1386     oc->jump_islands = NULL;
1387
1388   oc->island_start_symbol = first;
1389   oc->n_islands = count;
1390
1391   return 1;
1392 }
1393
1394 static unsigned long makeJumpIsland( ObjectCode* oc,
1395                                      unsigned long symbolNumber,
1396                                      unsigned long target )
1397 {
1398   ppcJumpIsland *island;
1399
1400   if( symbolNumber < oc->island_start_symbol ||
1401       symbolNumber - oc->island_start_symbol > oc->n_islands)
1402     return 0;
1403
1404   island = &oc->jump_islands[symbolNumber - oc->island_start_symbol];
1405
1406   // lis r12, hi16(target)
1407   island->lis_r12     = 0x3d80;
1408   island->hi_addr     = target >> 16;
1409
1410   // ori r12, r12, lo16(target)
1411   island->ori_r12_r12 = 0x618c;
1412   island->lo_addr     = target & 0xffff;
1413
1414   // mtctr r12
1415   island->mtctr_r12   = 0x7d8903a6;
1416
1417   // bctr
1418   island->bctr        = 0x4e800420;
1419
1420   return (unsigned long) island;
1421 }
1422
1423 /*
1424    ocFlushInstructionCache
1425
1426    Flush the data & instruction caches.
1427    Because the PPC has split data/instruction caches, we have to
1428    do that whenever we modify code at runtime.
1429  */
1430
1431 static void ocFlushInstructionCache( ObjectCode *oc )
1432 {
1433     int n = (oc->fileSize + sizeof( ppcJumpIsland ) * oc->n_islands + 3) / 4;
1434     unsigned long *p = (unsigned long *) oc->image;
1435
1436     while( n-- )
1437     {
1438         __asm__ volatile ( "dcbf 0,%0\n\t"
1439                            "sync\n\t"
1440                            "icbi 0,%0"
1441                            :
1442                            : "r" (p)
1443                          );
1444         p++;
1445     }
1446     __asm__ volatile ( "sync\n\t"
1447                        "isync"
1448                      );
1449 }
1450 #endif
1451
1452 /* --------------------------------------------------------------------------
1453  * PEi386 specifics (Win32 targets)
1454  * ------------------------------------------------------------------------*/
1455
1456 /* The information for this linker comes from
1457       Microsoft Portable Executable
1458       and Common Object File Format Specification
1459       revision 5.1 January 1998
1460    which SimonM says comes from the MS Developer Network CDs.
1461
1462    It can be found there (on older CDs), but can also be found
1463    online at:
1464
1465       http://www.microsoft.com/hwdev/hardware/PECOFF.asp
1466
1467    (this is Rev 6.0 from February 1999).
1468
1469    Things move, so if that fails, try searching for it via
1470
1471       http://www.google.com/search?q=PE+COFF+specification
1472
1473    The ultimate reference for the PE format is the Winnt.h
1474    header file that comes with the Platform SDKs; as always,
1475    implementations will drift wrt their documentation.
1476
1477    A good background article on the PE format is Matt Pietrek's
1478    March 1994 article in Microsoft System Journal (MSJ)
1479    (Vol.9, No. 3): "Peering Inside the PE: A Tour of the
1480    Win32 Portable Executable File Format." The info in there
1481    has recently been updated in a two part article in
1482    MSDN magazine, issues Feb and March 2002,
1483    "Inside Windows: An In-Depth Look into the Win32 Portable
1484    Executable File Format"
1485
1486    John Levine's book "Linkers and Loaders" contains useful
1487    info on PE too.
1488 */
1489
1490
1491 #if defined(OBJFORMAT_PEi386)
1492
1493
1494
1495 typedef unsigned char  UChar;
1496 typedef unsigned short UInt16;
1497 typedef unsigned int   UInt32;
1498 typedef          int   Int32;
1499
1500
1501 typedef
1502    struct {
1503       UInt16 Machine;
1504       UInt16 NumberOfSections;
1505       UInt32 TimeDateStamp;
1506       UInt32 PointerToSymbolTable;
1507       UInt32 NumberOfSymbols;
1508       UInt16 SizeOfOptionalHeader;
1509       UInt16 Characteristics;
1510    }
1511    COFF_header;
1512
1513 #define sizeof_COFF_header 20
1514
1515
1516 typedef
1517    struct {
1518       UChar  Name[8];
1519       UInt32 VirtualSize;
1520       UInt32 VirtualAddress;
1521       UInt32 SizeOfRawData;
1522       UInt32 PointerToRawData;
1523       UInt32 PointerToRelocations;
1524       UInt32 PointerToLinenumbers;
1525       UInt16 NumberOfRelocations;
1526       UInt16 NumberOfLineNumbers;
1527       UInt32 Characteristics;
1528    }
1529    COFF_section;
1530
1531 #define sizeof_COFF_section 40
1532
1533
1534 typedef
1535    struct {
1536       UChar  Name[8];
1537       UInt32 Value;
1538       UInt16 SectionNumber;
1539       UInt16 Type;
1540       UChar  StorageClass;
1541       UChar  NumberOfAuxSymbols;
1542    }
1543    COFF_symbol;
1544
1545 #define sizeof_COFF_symbol 18
1546
1547
1548 typedef
1549    struct {
1550       UInt32 VirtualAddress;
1551       UInt32 SymbolTableIndex;
1552       UInt16 Type;
1553    }
1554    COFF_reloc;
1555
1556 #define sizeof_COFF_reloc 10
1557
1558
1559 /* From PE spec doc, section 3.3.2 */
1560 /* Note use of MYIMAGE_* since IMAGE_* are already defined in
1561    windows.h -- for the same purpose, but I want to know what I'm
1562    getting, here. */
1563 #define MYIMAGE_FILE_RELOCS_STRIPPED     0x0001
1564 #define MYIMAGE_FILE_EXECUTABLE_IMAGE    0x0002
1565 #define MYIMAGE_FILE_DLL                 0x2000
1566 #define MYIMAGE_FILE_SYSTEM              0x1000
1567 #define MYIMAGE_FILE_BYTES_REVERSED_HI   0x8000
1568 #define MYIMAGE_FILE_BYTES_REVERSED_LO   0x0080
1569 #define MYIMAGE_FILE_32BIT_MACHINE       0x0100
1570
1571 /* From PE spec doc, section 5.4.2 and 5.4.4 */
1572 #define MYIMAGE_SYM_CLASS_EXTERNAL       2
1573 #define MYIMAGE_SYM_CLASS_STATIC         3
1574 #define MYIMAGE_SYM_UNDEFINED            0
1575
1576 /* From PE spec doc, section 4.1 */
1577 #define MYIMAGE_SCN_CNT_CODE             0x00000020
1578 #define MYIMAGE_SCN_CNT_INITIALIZED_DATA 0x00000040
1579 #define MYIMAGE_SCN_LNK_NRELOC_OVFL      0x01000000
1580
1581 /* From PE spec doc, section 5.2.1 */
1582 #define MYIMAGE_REL_I386_DIR32           0x0006
1583 #define MYIMAGE_REL_I386_REL32           0x0014
1584
1585
1586 /* We use myindex to calculate array addresses, rather than
1587    simply doing the normal subscript thing.  That's because
1588    some of the above structs have sizes which are not
1589    a whole number of words.  GCC rounds their sizes up to a
1590    whole number of words, which means that the address calcs
1591    arising from using normal C indexing or pointer arithmetic
1592    are just plain wrong.  Sigh.
1593 */
1594 static UChar *
1595 myindex ( int scale, void* base, int index )
1596 {
1597    return
1598       ((UChar*)base) + scale * index;
1599 }
1600
1601
1602 static void
1603 printName ( UChar* name, UChar* strtab )
1604 {
1605    if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
1606       UInt32 strtab_offset = * (UInt32*)(name+4);
1607       debugBelch("%s", strtab + strtab_offset );
1608    } else {
1609       int i;
1610       for (i = 0; i < 8; i++) {
1611          if (name[i] == 0) break;
1612          debugBelch("%c", name[i] );
1613       }
1614    }
1615 }
1616
1617
1618 static void
1619 copyName ( UChar* name, UChar* strtab, UChar* dst, int dstSize )
1620 {
1621    if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
1622       UInt32 strtab_offset = * (UInt32*)(name+4);
1623       strncpy ( dst, strtab+strtab_offset, dstSize );
1624       dst[dstSize-1] = 0;
1625    } else {
1626       int i = 0;
1627       while (1) {
1628          if (i >= 8) break;
1629          if (name[i] == 0) break;
1630          dst[i] = name[i];
1631          i++;
1632       }
1633       dst[i] = 0;
1634    }
1635 }
1636
1637
1638 static UChar *
1639 cstring_from_COFF_symbol_name ( UChar* name, UChar* strtab )
1640 {
1641    UChar* newstr;
1642    /* If the string is longer than 8 bytes, look in the
1643       string table for it -- this will be correctly zero terminated.
1644    */
1645    if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
1646       UInt32 strtab_offset = * (UInt32*)(name+4);
1647       return ((UChar*)strtab) + strtab_offset;
1648    }
1649    /* Otherwise, if shorter than 8 bytes, return the original,
1650       which by defn is correctly terminated.
1651    */
1652    if (name[7]==0) return name;
1653    /* The annoying case: 8 bytes.  Copy into a temporary
1654       (which is never freed ...)
1655    */
1656    newstr = stgMallocBytes(9, "cstring_from_COFF_symbol_name");
1657    ASSERT(newstr);
1658    strncpy(newstr,name,8);
1659    newstr[8] = 0;
1660    return newstr;
1661 }
1662
1663
1664 /* Just compares the short names (first 8 chars) */
1665 static COFF_section *
1666 findPEi386SectionCalled ( ObjectCode* oc,  char* name )
1667 {
1668    int i;
1669    COFF_header* hdr
1670       = (COFF_header*)(oc->image);
1671    COFF_section* sectab
1672       = (COFF_section*) (
1673            ((UChar*)(oc->image))
1674            + sizeof_COFF_header + hdr->SizeOfOptionalHeader
1675         );
1676    for (i = 0; i < hdr->NumberOfSections; i++) {
1677       UChar* n1;
1678       UChar* n2;
1679       COFF_section* section_i
1680          = (COFF_section*)
1681            myindex ( sizeof_COFF_section, sectab, i );
1682       n1 = (UChar*) &(section_i->Name);
1683       n2 = name;
1684       if (n1[0]==n2[0] && n1[1]==n2[1] && n1[2]==n2[2] &&
1685           n1[3]==n2[3] && n1[4]==n2[4] && n1[5]==n2[5] &&
1686           n1[6]==n2[6] && n1[7]==n2[7])
1687          return section_i;
1688    }
1689
1690    return NULL;
1691 }
1692
1693
1694 static void
1695 zapTrailingAtSign ( UChar* sym )
1696 {
1697 #  define my_isdigit(c) ((c) >= '0' && (c) <= '9')
1698    int i, j;
1699    if (sym[0] == 0) return;
1700    i = 0;
1701    while (sym[i] != 0) i++;
1702    i--;
1703    j = i;
1704    while (j > 0 && my_isdigit(sym[j])) j--;
1705    if (j > 0 && sym[j] == '@' && j != i) sym[j] = 0;
1706 #  undef my_isdigit
1707 }
1708
1709
1710 static int
1711 ocVerifyImage_PEi386 ( ObjectCode* oc )
1712 {
1713    int i;
1714    UInt32 j, noRelocs;
1715    COFF_header*  hdr;
1716    COFF_section* sectab;
1717    COFF_symbol*  symtab;
1718    UChar*        strtab;
1719    /* debugBelch("\nLOADING %s\n", oc->fileName); */
1720    hdr = (COFF_header*)(oc->image);
1721    sectab = (COFF_section*) (
1722                ((UChar*)(oc->image))
1723                + sizeof_COFF_header + hdr->SizeOfOptionalHeader
1724             );
1725    symtab = (COFF_symbol*) (
1726                ((UChar*)(oc->image))
1727                + hdr->PointerToSymbolTable
1728             );
1729    strtab = ((UChar*)symtab)
1730             + hdr->NumberOfSymbols * sizeof_COFF_symbol;
1731
1732    if (hdr->Machine != 0x14c) {
1733       errorBelch("Not x86 PEi386");
1734       return 0;
1735    }
1736    if (hdr->SizeOfOptionalHeader != 0) {
1737       errorBelch("PEi386 with nonempty optional header");
1738       return 0;
1739    }
1740    if ( /* (hdr->Characteristics & MYIMAGE_FILE_RELOCS_STRIPPED) || */
1741         (hdr->Characteristics & MYIMAGE_FILE_EXECUTABLE_IMAGE) ||
1742         (hdr->Characteristics & MYIMAGE_FILE_DLL) ||
1743         (hdr->Characteristics & MYIMAGE_FILE_SYSTEM) ) {
1744       errorBelch("Not a PEi386 object file");
1745       return 0;
1746    }
1747    if ( (hdr->Characteristics & MYIMAGE_FILE_BYTES_REVERSED_HI)
1748         /* || !(hdr->Characteristics & MYIMAGE_FILE_32BIT_MACHINE) */ ) {
1749       errorBelch("Invalid PEi386 word size or endiannness: %d",
1750             (int)(hdr->Characteristics));
1751       return 0;
1752    }
1753    /* If the string table size is way crazy, this might indicate that
1754       there are more than 64k relocations, despite claims to the
1755       contrary.  Hence this test. */
1756    /* debugBelch("strtab size %d\n", * (UInt32*)strtab); */
1757 #if 0
1758    if ( (*(UInt32*)strtab) > 600000 ) {
1759       /* Note that 600k has no special significance other than being
1760          big enough to handle the almost-2MB-sized lumps that
1761          constitute HSwin32*.o. */
1762       debugBelch("PEi386 object has suspiciously large string table; > 64k relocs?");
1763       return 0;
1764    }
1765 #endif
1766
1767    /* No further verification after this point; only debug printing. */
1768    i = 0;
1769    IF_DEBUG(linker, i=1);
1770    if (i == 0) return 1;
1771
1772    debugBelch( "sectab offset = %d\n", ((UChar*)sectab) - ((UChar*)hdr) );
1773    debugBelch( "symtab offset = %d\n", ((UChar*)symtab) - ((UChar*)hdr) );
1774    debugBelch( "strtab offset = %d\n", ((UChar*)strtab) - ((UChar*)hdr) );
1775
1776    debugBelch("\n" );
1777    debugBelch( "Machine:           0x%x\n", (UInt32)(hdr->Machine) );
1778    debugBelch( "# sections:        %d\n",   (UInt32)(hdr->NumberOfSections) );
1779    debugBelch( "time/date:         0x%x\n", (UInt32)(hdr->TimeDateStamp) );
1780    debugBelch( "symtab offset:     %d\n",   (UInt32)(hdr->PointerToSymbolTable) );
1781    debugBelch( "# symbols:         %d\n",   (UInt32)(hdr->NumberOfSymbols) );
1782    debugBelch( "sz of opt hdr:     %d\n",   (UInt32)(hdr->SizeOfOptionalHeader) );
1783    debugBelch( "characteristics:   0x%x\n", (UInt32)(hdr->Characteristics) );
1784
1785    /* Print the section table. */
1786    debugBelch("\n" );
1787    for (i = 0; i < hdr->NumberOfSections; i++) {
1788       COFF_reloc* reltab;
1789       COFF_section* sectab_i
1790          = (COFF_section*)
1791            myindex ( sizeof_COFF_section, sectab, i );
1792       debugBelch(
1793                 "\n"
1794                 "section %d\n"
1795                 "     name `",
1796                 i
1797               );
1798       printName ( sectab_i->Name, strtab );
1799       debugBelch(
1800                 "'\n"
1801                 "    vsize %d\n"
1802                 "    vaddr %d\n"
1803                 "  data sz %d\n"
1804                 " data off %d\n"
1805                 "  num rel %d\n"
1806                 "  off rel %d\n"
1807                 "  ptr raw 0x%x\n",
1808                 sectab_i->VirtualSize,
1809                 sectab_i->VirtualAddress,
1810                 sectab_i->SizeOfRawData,
1811                 sectab_i->PointerToRawData,
1812                 sectab_i->NumberOfRelocations,
1813                 sectab_i->PointerToRelocations,
1814                 sectab_i->PointerToRawData
1815               );
1816       reltab = (COFF_reloc*) (
1817                   ((UChar*)(oc->image)) + sectab_i->PointerToRelocations
1818                );
1819
1820       if ( sectab_i->Characteristics & MYIMAGE_SCN_LNK_NRELOC_OVFL ) {
1821         /* If the relocation field (a short) has overflowed, the
1822          * real count can be found in the first reloc entry.
1823          *
1824          * See Section 4.1 (last para) of the PE spec (rev6.0).
1825          */
1826         COFF_reloc* rel = (COFF_reloc*)
1827                            myindex ( sizeof_COFF_reloc, reltab, 0 );
1828         noRelocs = rel->VirtualAddress;
1829         j = 1;
1830       } else {
1831         noRelocs = sectab_i->NumberOfRelocations;
1832         j = 0;
1833       }
1834
1835       for (; j < noRelocs; j++) {
1836          COFF_symbol* sym;
1837          COFF_reloc* rel = (COFF_reloc*)
1838                            myindex ( sizeof_COFF_reloc, reltab, j );
1839          debugBelch(
1840                    "        type 0x%-4x   vaddr 0x%-8x   name `",
1841                    (UInt32)rel->Type,
1842                    rel->VirtualAddress );
1843          sym = (COFF_symbol*)
1844                myindex ( sizeof_COFF_symbol, symtab, rel->SymbolTableIndex );
1845          /* Hmm..mysterious looking offset - what's it for? SOF */
1846          printName ( sym->Name, strtab -10 );
1847          debugBelch("'\n" );
1848       }
1849
1850       debugBelch("\n" );
1851    }
1852    debugBelch("\n" );
1853    debugBelch("string table has size 0x%x\n", * (UInt32*)strtab );
1854    debugBelch("---START of string table---\n");
1855    for (i = 4; i < *(Int32*)strtab; i++) {
1856       if (strtab[i] == 0)
1857          debugBelch("\n"); else
1858          debugBelch("%c", strtab[i] );
1859    }
1860    debugBelch("--- END  of string table---\n");
1861
1862    debugBelch("\n" );
1863    i = 0;
1864    while (1) {
1865       COFF_symbol* symtab_i;
1866       if (i >= (Int32)(hdr->NumberOfSymbols)) break;
1867       symtab_i = (COFF_symbol*)
1868                  myindex ( sizeof_COFF_symbol, symtab, i );
1869       debugBelch(
1870                 "symbol %d\n"
1871                 "     name `",
1872                 i
1873               );
1874       printName ( symtab_i->Name, strtab );
1875       debugBelch(
1876                 "'\n"
1877                 "    value 0x%x\n"
1878                 "   1+sec# %d\n"
1879                 "     type 0x%x\n"
1880                 "   sclass 0x%x\n"
1881                 "     nAux %d\n",
1882                 symtab_i->Value,
1883                 (Int32)(symtab_i->SectionNumber),
1884                 (UInt32)symtab_i->Type,
1885                 (UInt32)symtab_i->StorageClass,
1886                 (UInt32)symtab_i->NumberOfAuxSymbols
1887               );
1888       i += symtab_i->NumberOfAuxSymbols;
1889       i++;
1890    }
1891
1892    debugBelch("\n" );
1893    return 1;
1894 }
1895
1896
1897 static int
1898 ocGetNames_PEi386 ( ObjectCode* oc )
1899 {
1900    COFF_header*  hdr;
1901    COFF_section* sectab;
1902    COFF_symbol*  symtab;
1903    UChar*        strtab;
1904
1905    UChar* sname;
1906    void*  addr;
1907    int    i;
1908
1909    hdr = (COFF_header*)(oc->image);
1910    sectab = (COFF_section*) (
1911                ((UChar*)(oc->image))
1912                + sizeof_COFF_header + hdr->SizeOfOptionalHeader
1913             );
1914    symtab = (COFF_symbol*) (
1915                ((UChar*)(oc->image))
1916                + hdr->PointerToSymbolTable
1917             );
1918    strtab = ((UChar*)(oc->image))
1919             + hdr->PointerToSymbolTable
1920             + hdr->NumberOfSymbols * sizeof_COFF_symbol;
1921
1922    /* Allocate space for any (local, anonymous) .bss sections. */
1923
1924    for (i = 0; i < hdr->NumberOfSections; i++) {
1925       UChar* zspace;
1926       COFF_section* sectab_i
1927          = (COFF_section*)
1928            myindex ( sizeof_COFF_section, sectab, i );
1929       if (0 != strcmp(sectab_i->Name, ".bss")) continue;
1930       if (sectab_i->VirtualSize == 0) continue;
1931       /* This is a non-empty .bss section.  Allocate zeroed space for
1932          it, and set its PointerToRawData field such that oc->image +
1933          PointerToRawData == addr_of_zeroed_space.  */
1934       zspace = stgCallocBytes(1, sectab_i->VirtualSize,
1935                               "ocGetNames_PEi386(anonymous bss)");
1936       sectab_i->PointerToRawData = ((UChar*)zspace) - ((UChar*)(oc->image));
1937       addProddableBlock(oc, zspace, sectab_i->VirtualSize);
1938       /* debugBelch("BSS anon section at 0x%x\n", zspace); */
1939    }
1940
1941    /* Copy section information into the ObjectCode. */
1942
1943    for (i = 0; i < hdr->NumberOfSections; i++) {
1944       UChar* start;
1945       UChar* end;
1946       UInt32 sz;
1947
1948       SectionKind kind
1949          = SECTIONKIND_OTHER;
1950       COFF_section* sectab_i
1951          = (COFF_section*)
1952            myindex ( sizeof_COFF_section, sectab, i );
1953       IF_DEBUG(linker, debugBelch("section name = %s\n", sectab_i->Name ));
1954
1955 #     if 0
1956       /* I'm sure this is the Right Way to do it.  However, the
1957          alternative of testing the sectab_i->Name field seems to
1958          work ok with Cygwin.
1959       */
1960       if (sectab_i->Characteristics & MYIMAGE_SCN_CNT_CODE ||
1961           sectab_i->Characteristics & MYIMAGE_SCN_CNT_INITIALIZED_DATA)
1962          kind = SECTIONKIND_CODE_OR_RODATA;
1963 #     endif
1964
1965       if (0==strcmp(".text",sectab_i->Name) ||
1966           0==strcmp(".rdata",sectab_i->Name)||
1967           0==strcmp(".rodata",sectab_i->Name))
1968          kind = SECTIONKIND_CODE_OR_RODATA;
1969       if (0==strcmp(".data",sectab_i->Name) ||
1970           0==strcmp(".bss",sectab_i->Name))
1971          kind = SECTIONKIND_RWDATA;
1972
1973       ASSERT(sectab_i->SizeOfRawData == 0 || sectab_i->VirtualSize == 0);
1974       sz = sectab_i->SizeOfRawData;
1975       if (sz < sectab_i->VirtualSize) sz = sectab_i->VirtualSize;
1976
1977       start = ((UChar*)(oc->image)) + sectab_i->PointerToRawData;
1978       end   = start + sz - 1;
1979
1980       if (kind == SECTIONKIND_OTHER
1981           /* Ignore sections called which contain stabs debugging
1982              information. */
1983           && 0 != strcmp(".stab", sectab_i->Name)
1984           && 0 != strcmp(".stabstr", sectab_i->Name)
1985           /* ignore constructor section for now */
1986           && 0 != strcmp(".ctors", sectab_i->Name)
1987          ) {
1988          errorBelch("Unknown PEi386 section name `%s' (while processing: %s)", sectab_i->Name, oc->fileName);
1989          return 0;
1990       }
1991
1992       if (kind != SECTIONKIND_OTHER && end >= start) {
1993          addSection(oc, kind, start, end);
1994          addProddableBlock(oc, start, end - start + 1);
1995       }
1996    }
1997
1998    /* Copy exported symbols into the ObjectCode. */
1999
2000    oc->n_symbols = hdr->NumberOfSymbols;
2001    oc->symbols   = stgMallocBytes(oc->n_symbols * sizeof(char*),
2002                                   "ocGetNames_PEi386(oc->symbols)");
2003    /* Call me paranoid; I don't care. */
2004    for (i = 0; i < oc->n_symbols; i++)
2005       oc->symbols[i] = NULL;
2006
2007    i = 0;
2008    while (1) {
2009       COFF_symbol* symtab_i;
2010       if (i >= (Int32)(hdr->NumberOfSymbols)) break;
2011       symtab_i = (COFF_symbol*)
2012                  myindex ( sizeof_COFF_symbol, symtab, i );
2013
2014       addr  = NULL;
2015
2016       if (symtab_i->StorageClass == MYIMAGE_SYM_CLASS_EXTERNAL
2017           && symtab_i->SectionNumber != MYIMAGE_SYM_UNDEFINED) {
2018          /* This symbol is global and defined, viz, exported */
2019          /* for MYIMAGE_SYMCLASS_EXTERNAL
2020                 && !MYIMAGE_SYM_UNDEFINED,
2021             the address of the symbol is:
2022                 address of relevant section + offset in section
2023          */
2024          COFF_section* sectabent
2025             = (COFF_section*) myindex ( sizeof_COFF_section,
2026                                         sectab,
2027                                         symtab_i->SectionNumber-1 );
2028          addr = ((UChar*)(oc->image))
2029                 + (sectabent->PointerToRawData
2030                    + symtab_i->Value);
2031       }
2032       else
2033       if (symtab_i->SectionNumber == MYIMAGE_SYM_UNDEFINED
2034           && symtab_i->Value > 0) {
2035          /* This symbol isn't in any section at all, ie, global bss.
2036             Allocate zeroed space for it. */
2037          addr = stgCallocBytes(1, symtab_i->Value,
2038                                "ocGetNames_PEi386(non-anonymous bss)");
2039          addSection(oc, SECTIONKIND_RWDATA, addr,
2040                         ((UChar*)addr) + symtab_i->Value - 1);
2041          addProddableBlock(oc, addr, symtab_i->Value);
2042          /* debugBelch("BSS      section at 0x%x\n", addr); */
2043       }
2044
2045       if (addr != NULL ) {
2046          sname = cstring_from_COFF_symbol_name ( symtab_i->Name, strtab );
2047          /* debugBelch("addSymbol %p `%s \n", addr,sname);  */
2048          IF_DEBUG(linker, debugBelch("addSymbol %p `%s'\n", addr,sname);)
2049          ASSERT(i >= 0 && i < oc->n_symbols);
2050          /* cstring_from_COFF_symbol_name always succeeds. */
2051          oc->symbols[i] = sname;
2052          ghciInsertStrHashTable(oc->fileName, symhash, sname, addr);
2053       } else {
2054 #        if 0
2055          debugBelch(
2056                    "IGNORING symbol %d\n"
2057                    "     name `",
2058                    i
2059                  );
2060          printName ( symtab_i->Name, strtab );
2061          debugBelch(
2062                    "'\n"
2063                    "    value 0x%x\n"
2064                    "   1+sec# %d\n"
2065                    "     type 0x%x\n"
2066                    "   sclass 0x%x\n"
2067                    "     nAux %d\n",
2068                    symtab_i->Value,
2069                    (Int32)(symtab_i->SectionNumber),
2070                    (UInt32)symtab_i->Type,
2071                    (UInt32)symtab_i->StorageClass,
2072                    (UInt32)symtab_i->NumberOfAuxSymbols
2073                  );
2074 #        endif
2075       }
2076
2077       i += symtab_i->NumberOfAuxSymbols;
2078       i++;
2079    }
2080
2081    return 1;
2082 }
2083
2084
2085 static int
2086 ocResolve_PEi386 ( ObjectCode* oc )
2087 {
2088    COFF_header*  hdr;
2089    COFF_section* sectab;
2090    COFF_symbol*  symtab;
2091    UChar*        strtab;
2092
2093    UInt32        A;
2094    UInt32        S;
2095    UInt32*       pP;
2096
2097    int i;
2098    UInt32 j, noRelocs;
2099
2100    /* ToDo: should be variable-sized?  But is at least safe in the
2101       sense of buffer-overrun-proof. */
2102    char symbol[1000];
2103    /* debugBelch("resolving for %s\n", oc->fileName); */
2104
2105    hdr = (COFF_header*)(oc->image);
2106    sectab = (COFF_section*) (
2107                ((UChar*)(oc->image))
2108                + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2109             );
2110    symtab = (COFF_symbol*) (
2111                ((UChar*)(oc->image))
2112                + hdr->PointerToSymbolTable
2113             );
2114    strtab = ((UChar*)(oc->image))
2115             + hdr->PointerToSymbolTable
2116             + hdr->NumberOfSymbols * sizeof_COFF_symbol;
2117
2118    for (i = 0; i < hdr->NumberOfSections; i++) {
2119       COFF_section* sectab_i
2120          = (COFF_section*)
2121            myindex ( sizeof_COFF_section, sectab, i );
2122       COFF_reloc* reltab
2123          = (COFF_reloc*) (
2124               ((UChar*)(oc->image)) + sectab_i->PointerToRelocations
2125            );
2126
2127       /* Ignore sections called which contain stabs debugging
2128          information. */
2129       if (0 == strcmp(".stab", sectab_i->Name)
2130           || 0 == strcmp(".stabstr", sectab_i->Name)
2131           || 0 == strcmp(".ctors", sectab_i->Name))
2132          continue;
2133
2134       if ( sectab_i->Characteristics & MYIMAGE_SCN_LNK_NRELOC_OVFL ) {
2135         /* If the relocation field (a short) has overflowed, the
2136          * real count can be found in the first reloc entry.
2137          *
2138          * See Section 4.1 (last para) of the PE spec (rev6.0).
2139          *
2140          * Nov2003 update: the GNU linker still doesn't correctly
2141          * handle the generation of relocatable object files with
2142          * overflown relocations. Hence the output to warn of potential
2143          * troubles.
2144          */
2145         COFF_reloc* rel = (COFF_reloc*)
2146                            myindex ( sizeof_COFF_reloc, reltab, 0 );
2147         noRelocs = rel->VirtualAddress;
2148         debugBelch("WARNING: Overflown relocation field (# relocs found: %u)\n",
2149                    noRelocs);
2150         j = 1;
2151       } else {
2152         noRelocs = sectab_i->NumberOfRelocations;
2153         j = 0;
2154       }
2155
2156
2157       for (; j < noRelocs; j++) {
2158          COFF_symbol* sym;
2159          COFF_reloc* reltab_j
2160             = (COFF_reloc*)
2161               myindex ( sizeof_COFF_reloc, reltab, j );
2162
2163          /* the location to patch */
2164          pP = (UInt32*)(
2165                  ((UChar*)(oc->image))
2166                  + (sectab_i->PointerToRawData
2167                     + reltab_j->VirtualAddress
2168                     - sectab_i->VirtualAddress )
2169               );
2170          /* the existing contents of pP */
2171          A = *pP;
2172          /* the symbol to connect to */
2173          sym = (COFF_symbol*)
2174                myindex ( sizeof_COFF_symbol,
2175                          symtab, reltab_j->SymbolTableIndex );
2176          IF_DEBUG(linker,
2177                   debugBelch(
2178                             "reloc sec %2d num %3d:  type 0x%-4x   "
2179                             "vaddr 0x%-8x   name `",
2180                             i, j,
2181                             (UInt32)reltab_j->Type,
2182                             reltab_j->VirtualAddress );
2183                             printName ( sym->Name, strtab );
2184                             debugBelch("'\n" ));
2185
2186          if (sym->StorageClass == MYIMAGE_SYM_CLASS_STATIC) {
2187             COFF_section* section_sym
2188                = findPEi386SectionCalled ( oc, sym->Name );
2189             if (!section_sym) {
2190                errorBelch("%s: can't find section `%s'", oc->fileName, sym->Name);
2191                return 0;
2192             }
2193             S = ((UInt32)(oc->image))
2194                 + (section_sym->PointerToRawData
2195                    + sym->Value);
2196          } else {
2197             copyName ( sym->Name, strtab, symbol, 1000-1 );
2198             (void*)S = lookupLocalSymbol( oc, symbol );
2199             if ((void*)S != NULL) goto foundit;
2200             (void*)S = lookupSymbol( symbol );
2201             if ((void*)S != NULL) goto foundit;
2202             zapTrailingAtSign ( symbol );
2203             (void*)S = lookupLocalSymbol( oc, symbol );
2204             if ((void*)S != NULL) goto foundit;
2205             (void*)S = lookupSymbol( symbol );
2206             if ((void*)S != NULL) goto foundit;
2207             /* Newline first because the interactive linker has printed "linking..." */
2208             errorBelch("\n%s: unknown symbol `%s'", oc->fileName, symbol);
2209             return 0;
2210            foundit:;
2211          }
2212          checkProddableBlock(oc, pP);
2213          switch (reltab_j->Type) {
2214             case MYIMAGE_REL_I386_DIR32:
2215                *pP = A + S;
2216                break;
2217             case MYIMAGE_REL_I386_REL32:
2218                /* Tricky.  We have to insert a displacement at
2219                   pP which, when added to the PC for the _next_
2220                   insn, gives the address of the target (S).
2221                   Problem is to know the address of the next insn
2222                   when we only know pP.  We assume that this
2223                   literal field is always the last in the insn,
2224                   so that the address of the next insn is pP+4
2225                   -- hence the constant 4.
2226                   Also I don't know if A should be added, but so
2227                   far it has always been zero.
2228
2229                   SOF 05/2005: 'A' (old contents of *pP) have been observed
2230                   to contain values other than zero (the 'wx' object file
2231                   that came with wxhaskell-0.9.4; dunno how it was compiled..).
2232                   So, add displacement to old value instead of asserting
2233                   A to be zero. Fixes wxhaskell-related crashes, and no other
2234                   ill effects have been observed.
2235
2236                   Update: the reason why we're seeing these more elaborate
2237                   relocations is due to a switch in how the NCG compiles SRTs
2238                   and offsets to them from info tables. SRTs live in .(ro)data,
2239                   while info tables live in .text, causing GAS to emit REL32/DISP32
2240                   relocations with non-zero values. Adding the displacement is
2241                   the right thing to do.
2242                */
2243                *pP = S - ((UInt32)pP) - 4 + A;
2244                break;
2245             default:
2246                debugBelch("%s: unhandled PEi386 relocation type %d",
2247                      oc->fileName, reltab_j->Type);
2248                return 0;
2249          }
2250
2251       }
2252    }
2253
2254    IF_DEBUG(linker, debugBelch("completed %s", oc->fileName));
2255    return 1;
2256 }
2257
2258 #endif /* defined(OBJFORMAT_PEi386) */
2259
2260
2261 /* --------------------------------------------------------------------------
2262  * ELF specifics
2263  * ------------------------------------------------------------------------*/
2264
2265 #if defined(OBJFORMAT_ELF)
2266
2267 #define FALSE 0
2268 #define TRUE  1
2269
2270 #if defined(sparc_HOST_ARCH)
2271 #  define ELF_TARGET_SPARC  /* Used inside <elf.h> */
2272 #elif defined(i386_HOST_ARCH)
2273 #  define ELF_TARGET_386    /* Used inside <elf.h> */
2274 #elif defined(x86_64_HOST_ARCH)
2275 #  define ELF_TARGET_X64_64
2276 #  define ELF_64BIT
2277 #elif defined (ia64_HOST_ARCH)
2278 #  define ELF_TARGET_IA64   /* Used inside <elf.h> */
2279 #  define ELF_64BIT
2280 #  define ELF_FUNCTION_DESC /* calling convention uses function descriptors */
2281 #  define ELF_NEED_GOT      /* needs Global Offset Table */
2282 #  define ELF_NEED_PLT      /* needs Procedure Linkage Tables */
2283 #endif
2284
2285 #if !defined(openbsd_HOST_OS)
2286 #include <elf.h>
2287 #else
2288 /* openbsd elf has things in different places, with diff names */
2289 #include <elf_abi.h>
2290 #include <machine/reloc.h>
2291 #define R_386_32    RELOC_32
2292 #define R_386_PC32  RELOC_PC32
2293 #endif
2294
2295 /*
2296  * Define a set of types which can be used for both ELF32 and ELF64
2297  */
2298
2299 #ifdef ELF_64BIT
2300 #define ELFCLASS    ELFCLASS64
2301 #define Elf_Addr    Elf64_Addr
2302 #define Elf_Word    Elf64_Word
2303 #define Elf_Sword   Elf64_Sword
2304 #define Elf_Ehdr    Elf64_Ehdr
2305 #define Elf_Phdr    Elf64_Phdr
2306 #define Elf_Shdr    Elf64_Shdr
2307 #define Elf_Sym     Elf64_Sym
2308 #define Elf_Rel     Elf64_Rel
2309 #define Elf_Rela    Elf64_Rela
2310 #define ELF_ST_TYPE ELF64_ST_TYPE
2311 #define ELF_ST_BIND ELF64_ST_BIND
2312 #define ELF_R_TYPE  ELF64_R_TYPE
2313 #define ELF_R_SYM   ELF64_R_SYM
2314 #else
2315 #define ELFCLASS    ELFCLASS32
2316 #define Elf_Addr    Elf32_Addr
2317 #define Elf_Word    Elf32_Word
2318 #define Elf_Sword   Elf32_Sword
2319 #define Elf_Ehdr    Elf32_Ehdr
2320 #define Elf_Phdr    Elf32_Phdr
2321 #define Elf_Shdr    Elf32_Shdr
2322 #define Elf_Sym     Elf32_Sym
2323 #define Elf_Rel     Elf32_Rel
2324 #define Elf_Rela    Elf32_Rela
2325 #ifndef ELF_ST_TYPE
2326 #define ELF_ST_TYPE ELF32_ST_TYPE
2327 #endif
2328 #ifndef ELF_ST_BIND
2329 #define ELF_ST_BIND ELF32_ST_BIND
2330 #endif
2331 #ifndef ELF_R_TYPE
2332 #define ELF_R_TYPE  ELF32_R_TYPE
2333 #endif
2334 #ifndef ELF_R_SYM
2335 #define ELF_R_SYM   ELF32_R_SYM
2336 #endif
2337 #endif
2338
2339
2340 /*
2341  * Functions to allocate entries in dynamic sections.  Currently we simply
2342  * preallocate a large number, and we don't check if a entry for the given
2343  * target already exists (a linear search is too slow).  Ideally these
2344  * entries would be associated with symbols.
2345  */
2346
2347 /* These sizes sufficient to load HSbase + HShaskell98 + a few modules */
2348 #define GOT_SIZE            0x20000
2349 #define FUNCTION_TABLE_SIZE 0x10000
2350 #define PLT_SIZE            0x08000
2351
2352 #ifdef ELF_NEED_GOT
2353 static Elf_Addr got[GOT_SIZE];
2354 static unsigned int gotIndex;
2355 static Elf_Addr gp_val = (Elf_Addr)got;
2356
2357 static Elf_Addr
2358 allocateGOTEntry(Elf_Addr target)
2359 {
2360    Elf_Addr *entry;
2361
2362    if (gotIndex >= GOT_SIZE)
2363       barf("Global offset table overflow");
2364
2365    entry = &got[gotIndex++];
2366    *entry = target;
2367    return (Elf_Addr)entry;
2368 }
2369 #endif
2370
2371 #ifdef ELF_FUNCTION_DESC
2372 typedef struct {
2373    Elf_Addr ip;
2374    Elf_Addr gp;
2375 } FunctionDesc;
2376
2377 static FunctionDesc functionTable[FUNCTION_TABLE_SIZE];
2378 static unsigned int functionTableIndex;
2379
2380 static Elf_Addr
2381 allocateFunctionDesc(Elf_Addr target)
2382 {
2383    FunctionDesc *entry;
2384
2385    if (functionTableIndex >= FUNCTION_TABLE_SIZE)
2386       barf("Function table overflow");
2387
2388    entry = &functionTable[functionTableIndex++];
2389    entry->ip = target;
2390    entry->gp = (Elf_Addr)gp_val;
2391    return (Elf_Addr)entry;
2392 }
2393
2394 static Elf_Addr
2395 copyFunctionDesc(Elf_Addr target)
2396 {
2397    FunctionDesc *olddesc = (FunctionDesc *)target;
2398    FunctionDesc *newdesc;
2399
2400    newdesc = (FunctionDesc *)allocateFunctionDesc(olddesc->ip);
2401    newdesc->gp = olddesc->gp;
2402    return (Elf_Addr)newdesc;
2403 }
2404 #endif
2405
2406 #ifdef ELF_NEED_PLT
2407 #ifdef ia64_HOST_ARCH
2408 static void ia64_reloc_gprel22(Elf_Addr target, Elf_Addr value);
2409 static void ia64_reloc_pcrel21(Elf_Addr target, Elf_Addr value, ObjectCode *oc);
2410
2411 static unsigned char plt_code[] =
2412 {
2413    /* taken from binutils bfd/elfxx-ia64.c */
2414    0x0b, 0x78, 0x00, 0x02, 0x00, 0x24,  /*   [MMI]       addl r15=0,r1;;    */
2415    0x00, 0x41, 0x3c, 0x30, 0x28, 0xc0,  /*               ld8 r16=[r15],8    */
2416    0x01, 0x08, 0x00, 0x84,              /*               mov r14=r1;;       */
2417    0x11, 0x08, 0x00, 0x1e, 0x18, 0x10,  /*   [MIB]       ld8 r1=[r15]       */
2418    0x60, 0x80, 0x04, 0x80, 0x03, 0x00,  /*               mov b6=r16         */
2419    0x60, 0x00, 0x80, 0x00               /*               br.few b6;;        */
2420 };
2421
2422 /* If we can't get to the function descriptor via gp, take a local copy of it */
2423 #define PLT_RELOC(code, target) { \
2424    Elf64_Sxword rel_value = target - gp_val; \
2425    if ((rel_value > 0x1fffff) || (rel_value < -0x1fffff)) \
2426       ia64_reloc_gprel22((Elf_Addr)code, copyFunctionDesc(target)); \
2427    else \
2428       ia64_reloc_gprel22((Elf_Addr)code, target); \
2429    }
2430 #endif
2431
2432 typedef struct {
2433    unsigned char code[sizeof(plt_code)];
2434 } PLTEntry;
2435
2436 static Elf_Addr
2437 allocatePLTEntry(Elf_Addr target, ObjectCode *oc)
2438 {
2439    PLTEntry *plt = (PLTEntry *)oc->plt;
2440    PLTEntry *entry;
2441
2442    if (oc->pltIndex >= PLT_SIZE)
2443       barf("Procedure table overflow");
2444
2445    entry = &plt[oc->pltIndex++];
2446    memcpy(entry->code, plt_code, sizeof(entry->code));
2447    PLT_RELOC(entry->code, target);
2448    return (Elf_Addr)entry;
2449 }
2450
2451 static unsigned int
2452 PLTSize(void)
2453 {
2454    return (PLT_SIZE * sizeof(PLTEntry));
2455 }
2456 #endif
2457
2458
2459 /*
2460  * Generic ELF functions
2461  */
2462
2463 static char *
2464 findElfSection ( void* objImage, Elf_Word sh_type )
2465 {
2466    char* ehdrC = (char*)objImage;
2467    Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2468    Elf_Shdr* shdr = (Elf_Shdr*)(ehdrC + ehdr->e_shoff);
2469    char* sh_strtab = ehdrC + shdr[ehdr->e_shstrndx].sh_offset;
2470    char* ptr = NULL;
2471    int i;
2472
2473    for (i = 0; i < ehdr->e_shnum; i++) {
2474       if (shdr[i].sh_type == sh_type
2475           /* Ignore the section header's string table. */
2476           && i != ehdr->e_shstrndx
2477           /* Ignore string tables named .stabstr, as they contain
2478              debugging info. */
2479           && 0 != memcmp(".stabstr", sh_strtab + shdr[i].sh_name, 8)
2480          ) {
2481          ptr = ehdrC + shdr[i].sh_offset;
2482          break;
2483       }
2484    }
2485    return ptr;
2486 }
2487
2488 #if defined(ia64_HOST_ARCH)
2489 static Elf_Addr
2490 findElfSegment ( void* objImage, Elf_Addr vaddr )
2491 {
2492    char* ehdrC = (char*)objImage;
2493    Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2494    Elf_Phdr* phdr = (Elf_Phdr*)(ehdrC + ehdr->e_phoff);
2495    Elf_Addr segaddr = 0;
2496    int i;
2497
2498    for (i = 0; i < ehdr->e_phnum; i++) {
2499       segaddr = phdr[i].p_vaddr;
2500       if ((vaddr >= segaddr) && (vaddr < segaddr + phdr[i].p_memsz))
2501               break;
2502    }
2503    return segaddr;
2504 }
2505 #endif
2506
2507 static int
2508 ocVerifyImage_ELF ( ObjectCode* oc )
2509 {
2510    Elf_Shdr* shdr;
2511    Elf_Sym*  stab;
2512    int i, j, nent, nstrtab, nsymtabs;
2513    char* sh_strtab;
2514    char* strtab;
2515
2516    char*     ehdrC = (char*)(oc->image);
2517    Elf_Ehdr* ehdr  = (Elf_Ehdr*)ehdrC;
2518
2519    if (ehdr->e_ident[EI_MAG0] != ELFMAG0 ||
2520        ehdr->e_ident[EI_MAG1] != ELFMAG1 ||
2521        ehdr->e_ident[EI_MAG2] != ELFMAG2 ||
2522        ehdr->e_ident[EI_MAG3] != ELFMAG3) {
2523       errorBelch("%s: not an ELF object", oc->fileName);
2524       return 0;
2525    }
2526
2527    if (ehdr->e_ident[EI_CLASS] != ELFCLASS) {
2528       errorBelch("%s: unsupported ELF format", oc->fileName);
2529       return 0;
2530    }
2531
2532    if (ehdr->e_ident[EI_DATA] == ELFDATA2LSB) {
2533        IF_DEBUG(linker,debugBelch( "Is little-endian\n" ));
2534    } else
2535    if (ehdr->e_ident[EI_DATA] == ELFDATA2MSB) {
2536        IF_DEBUG(linker,debugBelch( "Is big-endian\n" ));
2537    } else {
2538        errorBelch("%s: unknown endiannness", oc->fileName);
2539        return 0;
2540    }
2541
2542    if (ehdr->e_type != ET_REL) {
2543       errorBelch("%s: not a relocatable object (.o) file", oc->fileName);
2544       return 0;
2545    }
2546    IF_DEBUG(linker, debugBelch( "Is a relocatable object (.o) file\n" ));
2547
2548    IF_DEBUG(linker,debugBelch( "Architecture is " ));
2549    switch (ehdr->e_machine) {
2550       case EM_386:   IF_DEBUG(linker,debugBelch( "x86" )); break;
2551       case EM_SPARC: IF_DEBUG(linker,debugBelch( "sparc" )); break;
2552 #ifdef EM_IA_64
2553       case EM_IA_64: IF_DEBUG(linker,debugBelch( "ia64" )); break;
2554 #endif
2555       case EM_PPC:   IF_DEBUG(linker,debugBelch( "powerpc32" )); break;
2556 #ifdef EM_X86_64
2557       case EM_X86_64: IF_DEBUG(linker,debugBelch( "x86_64" )); break;
2558 #endif
2559       default:       IF_DEBUG(linker,debugBelch( "unknown" ));
2560                      errorBelch("%s: unknown architecture", oc->fileName);
2561                      return 0;
2562    }
2563
2564    IF_DEBUG(linker,debugBelch(
2565              "\nSection header table: start %d, n_entries %d, ent_size %d\n",
2566              ehdr->e_shoff, ehdr->e_shnum, ehdr->e_shentsize  ));
2567
2568    ASSERT (ehdr->e_shentsize == sizeof(Elf_Shdr));
2569
2570    shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
2571
2572    if (ehdr->e_shstrndx == SHN_UNDEF) {
2573       errorBelch("%s: no section header string table", oc->fileName);
2574       return 0;
2575    } else {
2576       IF_DEBUG(linker,debugBelch( "Section header string table is section %d\n",
2577                           ehdr->e_shstrndx));
2578       sh_strtab = ehdrC + shdr[ehdr->e_shstrndx].sh_offset;
2579    }
2580
2581    for (i = 0; i < ehdr->e_shnum; i++) {
2582       IF_DEBUG(linker,debugBelch("%2d:  ", i ));
2583       IF_DEBUG(linker,debugBelch("type=%2d  ", (int)shdr[i].sh_type ));
2584       IF_DEBUG(linker,debugBelch("size=%4d  ", (int)shdr[i].sh_size ));
2585       IF_DEBUG(linker,debugBelch("offs=%4d  ", (int)shdr[i].sh_offset ));
2586       IF_DEBUG(linker,debugBelch("  (%p .. %p)  ",
2587                ehdrC + shdr[i].sh_offset,
2588                       ehdrC + shdr[i].sh_offset + shdr[i].sh_size - 1));
2589
2590       if (shdr[i].sh_type == SHT_REL) {
2591           IF_DEBUG(linker,debugBelch("Rel  " ));
2592       } else if (shdr[i].sh_type == SHT_RELA) {
2593           IF_DEBUG(linker,debugBelch("RelA " ));
2594       } else {
2595           IF_DEBUG(linker,debugBelch("     "));
2596       }
2597       if (sh_strtab) {
2598           IF_DEBUG(linker,debugBelch("sname=%s\n", sh_strtab + shdr[i].sh_name ));
2599       }
2600    }
2601
2602    IF_DEBUG(linker,debugBelch( "\nString tables" ));
2603    strtab = NULL;
2604    nstrtab = 0;
2605    for (i = 0; i < ehdr->e_shnum; i++) {
2606       if (shdr[i].sh_type == SHT_STRTAB
2607           /* Ignore the section header's string table. */
2608           && i != ehdr->e_shstrndx
2609           /* Ignore string tables named .stabstr, as they contain
2610              debugging info. */
2611           && 0 != memcmp(".stabstr", sh_strtab + shdr[i].sh_name, 8)
2612          ) {
2613          IF_DEBUG(linker,debugBelch("   section %d is a normal string table", i ));
2614          strtab = ehdrC + shdr[i].sh_offset;
2615          nstrtab++;
2616       }
2617    }
2618    if (nstrtab != 1) {
2619       errorBelch("%s: no string tables, or too many", oc->fileName);
2620       return 0;
2621    }
2622
2623    nsymtabs = 0;
2624    IF_DEBUG(linker,debugBelch( "\nSymbol tables" ));
2625    for (i = 0; i < ehdr->e_shnum; i++) {
2626       if (shdr[i].sh_type != SHT_SYMTAB) continue;
2627       IF_DEBUG(linker,debugBelch( "section %d is a symbol table\n", i ));
2628       nsymtabs++;
2629       stab = (Elf_Sym*) (ehdrC + shdr[i].sh_offset);
2630       nent = shdr[i].sh_size / sizeof(Elf_Sym);
2631       IF_DEBUG(linker,debugBelch( "   number of entries is apparently %d (%d rem)\n",
2632                nent,
2633                shdr[i].sh_size % sizeof(Elf_Sym)
2634              ));
2635       if (0 != shdr[i].sh_size % sizeof(Elf_Sym)) {
2636          errorBelch("%s: non-integral number of symbol table entries", oc->fileName);
2637          return 0;
2638       }
2639       for (j = 0; j < nent; j++) {
2640          IF_DEBUG(linker,debugBelch("   %2d  ", j ));
2641          IF_DEBUG(linker,debugBelch("  sec=%-5d  size=%-3d  val=%5p  ",
2642                              (int)stab[j].st_shndx,
2643                              (int)stab[j].st_size,
2644                              (char*)stab[j].st_value ));
2645
2646          IF_DEBUG(linker,debugBelch("type=" ));
2647          switch (ELF_ST_TYPE(stab[j].st_info)) {
2648             case STT_NOTYPE:  IF_DEBUG(linker,debugBelch("notype " )); break;
2649             case STT_OBJECT:  IF_DEBUG(linker,debugBelch("object " )); break;
2650             case STT_FUNC  :  IF_DEBUG(linker,debugBelch("func   " )); break;
2651             case STT_SECTION: IF_DEBUG(linker,debugBelch("section" )); break;
2652             case STT_FILE:    IF_DEBUG(linker,debugBelch("file   " )); break;
2653             default:          IF_DEBUG(linker,debugBelch("?      " )); break;
2654          }
2655          IF_DEBUG(linker,debugBelch("  " ));
2656
2657          IF_DEBUG(linker,debugBelch("bind=" ));
2658          switch (ELF_ST_BIND(stab[j].st_info)) {
2659             case STB_LOCAL :  IF_DEBUG(linker,debugBelch("local " )); break;
2660             case STB_GLOBAL:  IF_DEBUG(linker,debugBelch("global" )); break;
2661             case STB_WEAK  :  IF_DEBUG(linker,debugBelch("weak  " )); break;
2662             default:          IF_DEBUG(linker,debugBelch("?     " )); break;
2663          }
2664          IF_DEBUG(linker,debugBelch("  " ));
2665
2666          IF_DEBUG(linker,debugBelch("name=%s\n", strtab + stab[j].st_name ));
2667       }
2668    }
2669
2670    if (nsymtabs == 0) {
2671       errorBelch("%s: didn't find any symbol tables", oc->fileName);
2672       return 0;
2673    }
2674
2675    return 1;
2676 }
2677
2678 static int getSectionKind_ELF( Elf_Shdr *hdr, int *is_bss )
2679 {
2680     *is_bss = FALSE;
2681
2682     if (hdr->sh_type == SHT_PROGBITS
2683         && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_EXECINSTR)) {
2684         /* .text-style section */
2685         return SECTIONKIND_CODE_OR_RODATA;
2686     }
2687
2688     if (hdr->sh_type == SHT_PROGBITS
2689             && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_WRITE)) {
2690             /* .data-style section */
2691             return SECTIONKIND_RWDATA;
2692     }
2693
2694     if (hdr->sh_type == SHT_PROGBITS
2695         && (hdr->sh_flags & SHF_ALLOC) && !(hdr->sh_flags & SHF_WRITE)) {
2696         /* .rodata-style section */
2697         return SECTIONKIND_CODE_OR_RODATA;
2698     }
2699
2700     if (hdr->sh_type == SHT_NOBITS
2701         && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_WRITE)) {
2702         /* .bss-style section */
2703         *is_bss = TRUE;
2704         return SECTIONKIND_RWDATA;
2705     }
2706
2707     return SECTIONKIND_OTHER;
2708 }
2709
2710
2711 static int
2712 ocGetNames_ELF ( ObjectCode* oc )
2713 {
2714    int i, j, k, nent;
2715    Elf_Sym* stab;
2716
2717    char*     ehdrC    = (char*)(oc->image);
2718    Elf_Ehdr* ehdr     = (Elf_Ehdr*)ehdrC;
2719    char*     strtab   = findElfSection ( ehdrC, SHT_STRTAB );
2720    Elf_Shdr* shdr     = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
2721
2722    ASSERT(symhash != NULL);
2723
2724    if (!strtab) {
2725       errorBelch("%s: no strtab", oc->fileName);
2726       return 0;
2727    }
2728
2729    k = 0;
2730    for (i = 0; i < ehdr->e_shnum; i++) {
2731       /* Figure out what kind of section it is.  Logic derived from
2732          Figure 1.14 ("Special Sections") of the ELF document
2733          ("Portable Formats Specification, Version 1.1"). */
2734       int         is_bss = FALSE;
2735       SectionKind kind   = getSectionKind_ELF(&shdr[i], &is_bss);
2736
2737       if (is_bss && shdr[i].sh_size > 0) {
2738          /* This is a non-empty .bss section.  Allocate zeroed space for
2739             it, and set its .sh_offset field such that
2740             ehdrC + .sh_offset == addr_of_zeroed_space.  */
2741          char* zspace = stgCallocBytes(1, shdr[i].sh_size,
2742                                        "ocGetNames_ELF(BSS)");
2743          shdr[i].sh_offset = ((char*)zspace) - ((char*)ehdrC);
2744          /*
2745          debugBelch("BSS section at 0x%x, size %d\n",
2746                          zspace, shdr[i].sh_size);
2747          */
2748       }
2749
2750       /* fill in the section info */
2751       if (kind != SECTIONKIND_OTHER && shdr[i].sh_size > 0) {
2752          addProddableBlock(oc, ehdrC + shdr[i].sh_offset, shdr[i].sh_size);
2753          addSection(oc, kind, ehdrC + shdr[i].sh_offset,
2754                         ehdrC + shdr[i].sh_offset + shdr[i].sh_size - 1);
2755       }
2756
2757       if (shdr[i].sh_type != SHT_SYMTAB) continue;
2758
2759       /* copy stuff into this module's object symbol table */
2760       stab = (Elf_Sym*) (ehdrC + shdr[i].sh_offset);
2761       nent = shdr[i].sh_size / sizeof(Elf_Sym);
2762
2763       oc->n_symbols = nent;
2764       oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
2765                                    "ocGetNames_ELF(oc->symbols)");
2766
2767       for (j = 0; j < nent; j++) {
2768
2769          char  isLocal = FALSE; /* avoids uninit-var warning */
2770          char* ad      = NULL;
2771          char* nm      = strtab + stab[j].st_name;
2772          int   secno   = stab[j].st_shndx;
2773
2774          /* Figure out if we want to add it; if so, set ad to its
2775             address.  Otherwise leave ad == NULL. */
2776
2777          if (secno == SHN_COMMON) {
2778             isLocal = FALSE;
2779             ad = stgCallocBytes(1, stab[j].st_size, "ocGetNames_ELF(COMMON)");
2780             /*
2781             debugBelch("COMMON symbol, size %d name %s\n",
2782                             stab[j].st_size, nm);
2783             */
2784             /* Pointless to do addProddableBlock() for this area,
2785                since the linker should never poke around in it. */
2786          }
2787          else
2788          if ( ( ELF_ST_BIND(stab[j].st_info)==STB_GLOBAL
2789                 || ELF_ST_BIND(stab[j].st_info)==STB_LOCAL
2790               )
2791               /* and not an undefined symbol */
2792               && stab[j].st_shndx != SHN_UNDEF
2793               /* and not in a "special section" */
2794               && stab[j].st_shndx < SHN_LORESERVE
2795               &&
2796               /* and it's a not a section or string table or anything silly */
2797               ( ELF_ST_TYPE(stab[j].st_info)==STT_FUNC ||
2798                 ELF_ST_TYPE(stab[j].st_info)==STT_OBJECT ||
2799                 ELF_ST_TYPE(stab[j].st_info)==STT_NOTYPE
2800               )
2801             ) {
2802             /* Section 0 is the undefined section, hence > and not >=. */
2803             ASSERT(secno > 0 && secno < ehdr->e_shnum);
2804             /*
2805             if (shdr[secno].sh_type == SHT_NOBITS) {
2806                debugBelch("   BSS symbol, size %d off %d name %s\n",
2807                                stab[j].st_size, stab[j].st_value, nm);
2808             }
2809             */
2810             ad = ehdrC + shdr[ secno ].sh_offset + stab[j].st_value;
2811             if (ELF_ST_BIND(stab[j].st_info)==STB_LOCAL) {
2812                isLocal = TRUE;
2813             } else {
2814 #ifdef ELF_FUNCTION_DESC
2815                /* dlsym() and the initialisation table both give us function
2816                 * descriptors, so to be consistent we store function descriptors
2817                 * in the symbol table */
2818                if (ELF_ST_TYPE(stab[j].st_info) == STT_FUNC)
2819                    ad = (char *)allocateFunctionDesc((Elf_Addr)ad);
2820 #endif
2821                IF_DEBUG(linker,debugBelch( "addOTabName(GLOB): %10p  %s %s",
2822                                       ad, oc->fileName, nm ));
2823                isLocal = FALSE;
2824             }
2825          }
2826
2827          /* And the decision is ... */
2828
2829          if (ad != NULL) {
2830             ASSERT(nm != NULL);
2831             oc->symbols[j] = nm;
2832             /* Acquire! */
2833             if (isLocal) {
2834                /* Ignore entirely. */
2835             } else {
2836                ghciInsertStrHashTable(oc->fileName, symhash, nm, ad);
2837             }
2838          } else {
2839             /* Skip. */
2840             IF_DEBUG(linker,debugBelch( "skipping `%s'\n",
2841                                    strtab + stab[j].st_name ));
2842             /*
2843             debugBelch(
2844                     "skipping   bind = %d,  type = %d,  shndx = %d   `%s'\n",
2845                     (int)ELF_ST_BIND(stab[j].st_info),
2846                     (int)ELF_ST_TYPE(stab[j].st_info),
2847                     (int)stab[j].st_shndx,
2848                     strtab + stab[j].st_name
2849                    );
2850             */
2851             oc->symbols[j] = NULL;
2852          }
2853
2854       }
2855    }
2856
2857    return 1;
2858 }
2859
2860 /* Do ELF relocations which lack an explicit addend.  All x86-linux
2861    relocations appear to be of this form. */
2862 static int
2863 do_Elf_Rel_relocations ( ObjectCode* oc, char* ehdrC,
2864                          Elf_Shdr* shdr, int shnum,
2865                          Elf_Sym*  stab, char* strtab )
2866 {
2867    int j;
2868    char *symbol;
2869    Elf_Word* targ;
2870    Elf_Rel*  rtab = (Elf_Rel*) (ehdrC + shdr[shnum].sh_offset);
2871    int         nent = shdr[shnum].sh_size / sizeof(Elf_Rel);
2872    int target_shndx = shdr[shnum].sh_info;
2873    int symtab_shndx = shdr[shnum].sh_link;
2874
2875    stab  = (Elf_Sym*) (ehdrC + shdr[ symtab_shndx ].sh_offset);
2876    targ  = (Elf_Word*)(ehdrC + shdr[ target_shndx ].sh_offset);
2877    IF_DEBUG(linker,debugBelch( "relocations for section %d using symtab %d\n",
2878                           target_shndx, symtab_shndx ));
2879
2880    /* Skip sections that we're not interested in. */
2881    {
2882        int is_bss;
2883        SectionKind kind = getSectionKind_ELF(&shdr[target_shndx], &is_bss);
2884        if (kind == SECTIONKIND_OTHER) {
2885            IF_DEBUG(linker,debugBelch( "skipping (target section not loaded)"));
2886            return 1;
2887        }
2888    }
2889
2890    for (j = 0; j < nent; j++) {
2891       Elf_Addr offset = rtab[j].r_offset;
2892       Elf_Addr info   = rtab[j].r_info;
2893
2894       Elf_Addr  P  = ((Elf_Addr)targ) + offset;
2895       Elf_Word* pP = (Elf_Word*)P;
2896       Elf_Addr  A  = *pP;
2897       Elf_Addr  S;
2898       void*     S_tmp;
2899       Elf_Addr  value;
2900
2901       IF_DEBUG(linker,debugBelch( "Rel entry %3d is raw(%6p %6p)",
2902                              j, (void*)offset, (void*)info ));
2903       if (!info) {
2904          IF_DEBUG(linker,debugBelch( " ZERO" ));
2905          S = 0;
2906       } else {
2907          Elf_Sym sym = stab[ELF_R_SYM(info)];
2908          /* First see if it is a local symbol. */
2909          if (ELF_ST_BIND(sym.st_info) == STB_LOCAL) {
2910             /* Yes, so we can get the address directly from the ELF symbol
2911                table. */
2912             symbol = sym.st_name==0 ? "(noname)" : strtab+sym.st_name;
2913             S = (Elf_Addr)
2914                 (ehdrC + shdr[ sym.st_shndx ].sh_offset
2915                        + stab[ELF_R_SYM(info)].st_value);
2916
2917          } else {
2918             /* No, so look up the name in our global table. */
2919             symbol = strtab + sym.st_name;
2920             S_tmp = lookupSymbol( symbol );
2921             S = (Elf_Addr)S_tmp;
2922          }
2923          if (!S) {
2924             errorBelch("%s: unknown symbol `%s'", oc->fileName, symbol);
2925             return 0;
2926          }
2927          IF_DEBUG(linker,debugBelch( "`%s' resolves to %p\n", symbol, (void*)S ));
2928       }
2929
2930       IF_DEBUG(linker,debugBelch( "Reloc: P = %p   S = %p   A = %p\n",
2931                              (void*)P, (void*)S, (void*)A ));
2932       checkProddableBlock ( oc, pP );
2933
2934       value = S + A;
2935
2936       switch (ELF_R_TYPE(info)) {
2937 #        ifdef i386_HOST_ARCH
2938          case R_386_32:   *pP = value;     break;
2939          case R_386_PC32: *pP = value - P; break;
2940 #        endif
2941          default:
2942             errorBelch("%s: unhandled ELF relocation(Rel) type %d\n",
2943                   oc->fileName, ELF_R_TYPE(info));
2944             return 0;
2945       }
2946
2947    }
2948    return 1;
2949 }
2950
2951 /* Do ELF relocations for which explicit addends are supplied.
2952    sparc-solaris relocations appear to be of this form. */
2953 static int
2954 do_Elf_Rela_relocations ( ObjectCode* oc, char* ehdrC,
2955                           Elf_Shdr* shdr, int shnum,
2956                           Elf_Sym*  stab, char* strtab )
2957 {
2958    int j;
2959    char *symbol;
2960    Elf_Addr targ;
2961    Elf_Rela* rtab = (Elf_Rela*) (ehdrC + shdr[shnum].sh_offset);
2962    int         nent = shdr[shnum].sh_size / sizeof(Elf_Rela);
2963    int target_shndx = shdr[shnum].sh_info;
2964    int symtab_shndx = shdr[shnum].sh_link;
2965
2966    stab  = (Elf_Sym*) (ehdrC + shdr[ symtab_shndx ].sh_offset);
2967    targ  = (Elf_Addr) (ehdrC + shdr[ target_shndx ].sh_offset);
2968    IF_DEBUG(linker,debugBelch( "relocations for section %d using symtab %d\n",
2969                           target_shndx, symtab_shndx ));
2970
2971    for (j = 0; j < nent; j++) {
2972 #if defined(DEBUG) || defined(sparc_HOST_ARCH) || defined(ia64_HOST_ARCH) || defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH)
2973       /* This #ifdef only serves to avoid unused-var warnings. */
2974       Elf_Addr  offset = rtab[j].r_offset;
2975       Elf_Addr  P      = targ + offset;
2976 #endif
2977       Elf_Addr  info   = rtab[j].r_info;
2978       Elf_Addr  A      = rtab[j].r_addend;
2979       Elf_Addr  S;
2980       void*     S_tmp;
2981       Elf_Addr  value;
2982 #     if defined(sparc_HOST_ARCH)
2983       Elf_Word* pP = (Elf_Word*)P;
2984       Elf_Word  w1, w2;
2985 #     elif defined(ia64_HOST_ARCH)
2986       Elf64_Xword *pP = (Elf64_Xword *)P;
2987       Elf_Addr addr;
2988 #     elif defined(powerpc_HOST_ARCH)
2989       Elf_Sword delta;
2990 #     endif
2991
2992       IF_DEBUG(linker,debugBelch( "Rel entry %3d is raw(%6p %6p %6p)   ",
2993                              j, (void*)offset, (void*)info,
2994                                 (void*)A ));
2995       if (!info) {
2996          IF_DEBUG(linker,debugBelch( " ZERO" ));
2997          S = 0;
2998       } else {
2999          Elf_Sym sym = stab[ELF_R_SYM(info)];
3000          /* First see if it is a local symbol. */
3001          if (ELF_ST_BIND(sym.st_info) == STB_LOCAL) {
3002             /* Yes, so we can get the address directly from the ELF symbol
3003                table. */
3004             symbol = sym.st_name==0 ? "(noname)" : strtab+sym.st_name;
3005             S = (Elf_Addr)
3006                 (ehdrC + shdr[ sym.st_shndx ].sh_offset
3007                        + stab[ELF_R_SYM(info)].st_value);
3008 #ifdef ELF_FUNCTION_DESC
3009             /* Make a function descriptor for this function */
3010             if (S && ELF_ST_TYPE(sym.st_info) == STT_FUNC) {
3011                S = allocateFunctionDesc(S + A);
3012                A = 0;
3013             }
3014 #endif
3015          } else {
3016             /* No, so look up the name in our global table. */
3017             symbol = strtab + sym.st_name;
3018             S_tmp = lookupSymbol( symbol );
3019             S = (Elf_Addr)S_tmp;
3020
3021 #ifdef ELF_FUNCTION_DESC
3022             /* If a function, already a function descriptor - we would
3023                have to copy it to add an offset. */
3024             if (S && (ELF_ST_TYPE(sym.st_info) == STT_FUNC) && (A != 0))
3025                errorBelch("%s: function %s with addend %p", oc->fileName, symbol, (void *)A);
3026 #endif
3027          }
3028          if (!S) {
3029            errorBelch("%s: unknown symbol `%s'", oc->fileName, symbol);
3030            return 0;
3031          }
3032          IF_DEBUG(linker,debugBelch( "`%s' resolves to %p", symbol, (void*)S ));
3033       }
3034
3035       IF_DEBUG(linker,debugBelch("Reloc: P = %p   S = %p   A = %p\n",
3036                                         (void*)P, (void*)S, (void*)A ));
3037       /* checkProddableBlock ( oc, (void*)P ); */
3038
3039       value = S + A;
3040
3041       switch (ELF_R_TYPE(info)) {
3042 #        if defined(sparc_HOST_ARCH)
3043          case R_SPARC_WDISP30:
3044             w1 = *pP & 0xC0000000;
3045             w2 = (Elf_Word)((value - P) >> 2);
3046             ASSERT((w2 & 0xC0000000) == 0);
3047             w1 |= w2;
3048             *pP = w1;
3049             break;
3050          case R_SPARC_HI22:
3051             w1 = *pP & 0xFFC00000;
3052             w2 = (Elf_Word)(value >> 10);
3053             ASSERT((w2 & 0xFFC00000) == 0);
3054             w1 |= w2;
3055             *pP = w1;
3056             break;
3057          case R_SPARC_LO10:
3058             w1 = *pP & ~0x3FF;
3059             w2 = (Elf_Word)(value & 0x3FF);
3060             ASSERT((w2 & ~0x3FF) == 0);
3061             w1 |= w2;
3062             *pP = w1;
3063             break;
3064          /* According to the Sun documentation:
3065             R_SPARC_UA32
3066             This relocation type resembles R_SPARC_32, except it refers to an
3067             unaligned word. That is, the word to be relocated must be treated
3068             as four separate bytes with arbitrary alignment, not as a word
3069             aligned according to the architecture requirements.
3070
3071             (JRS: which means that freeloading on the R_SPARC_32 case
3072             is probably wrong, but hey ...)
3073          */
3074          case R_SPARC_UA32:
3075          case R_SPARC_32:
3076             w2 = (Elf_Word)value;
3077             *pP = w2;
3078             break;
3079 #        elif defined(ia64_HOST_ARCH)
3080          case R_IA64_DIR64LSB:
3081          case R_IA64_FPTR64LSB:
3082             *pP = value;
3083             break;
3084          case R_IA64_PCREL64LSB:
3085             *pP = value - P;
3086             break;
3087          case R_IA64_SEGREL64LSB:
3088             addr = findElfSegment(ehdrC, value);
3089             *pP = value - addr;
3090             break;
3091          case R_IA64_GPREL22:
3092             ia64_reloc_gprel22(P, value);
3093             break;
3094          case R_IA64_LTOFF22:
3095          case R_IA64_LTOFF22X:
3096          case R_IA64_LTOFF_FPTR22:
3097             addr = allocateGOTEntry(value);
3098             ia64_reloc_gprel22(P, addr);
3099             break;
3100          case R_IA64_PCREL21B:
3101             ia64_reloc_pcrel21(P, S, oc);
3102             break;
3103          case R_IA64_LDXMOV:
3104             /* This goes with R_IA64_LTOFF22X and points to the load to
3105              * convert into a move.  We don't implement relaxation. */
3106             break;
3107 #        elif defined(powerpc_HOST_ARCH)
3108          case R_PPC_ADDR16_LO:
3109             *(Elf32_Half*) P = value;
3110             break;
3111
3112          case R_PPC_ADDR16_HI:
3113             *(Elf32_Half*) P = value >> 16;
3114             break;
3115
3116          case R_PPC_ADDR16_HA:
3117             *(Elf32_Half*) P = (value + 0x8000) >> 16;
3118             break;
3119
3120          case R_PPC_ADDR32:
3121             *(Elf32_Word *) P = value;
3122             break;
3123
3124          case R_PPC_REL32:
3125             *(Elf32_Word *) P = value - P;
3126             break;
3127
3128          case R_PPC_REL24:
3129             delta = value - P;
3130
3131             if( delta << 6 >> 6 != delta )
3132             {
3133                value = makeJumpIsland( oc, ELF_R_SYM(info), value );
3134                delta = value - P;
3135
3136                if( value == 0 || delta << 6 >> 6 != delta )
3137                {
3138                   barf( "Unable to make ppcJumpIsland for #%d",
3139                         ELF_R_SYM(info) );
3140                   return 0;
3141                }
3142             }
3143
3144             *(Elf_Word *) P = (*(Elf_Word *) P & 0xfc000003)
3145                                           | (delta & 0x3fffffc);
3146             break;
3147 #        endif
3148
3149 #if x86_64_HOST_OS
3150       case R_X86_64_64:
3151           *(Elf64_Xword *)P = value;
3152           break;
3153
3154       case R_X86_64_PC32:
3155           *(Elf64_Word *)P = (Elf64_Word) (value - P);
3156           break;
3157
3158       case R_X86_64_32:
3159           *(Elf64_Word *)P = (Elf64_Word)value;
3160           break;
3161
3162       case R_X86_64_32S:
3163           *(Elf64_Sword *)P = (Elf64_Sword)value;
3164           break;
3165 #endif
3166
3167          default:
3168             errorBelch("%s: unhandled ELF relocation(RelA) type %d\n",
3169                   oc->fileName, ELF_R_TYPE(info));
3170             return 0;
3171       }
3172
3173    }
3174    return 1;
3175 }
3176
3177 static int
3178 ocResolve_ELF ( ObjectCode* oc )
3179 {
3180    char *strtab;
3181    int   shnum, ok;
3182    Elf_Sym*  stab  = NULL;
3183    char*     ehdrC = (char*)(oc->image);
3184    Elf_Ehdr* ehdr  = (Elf_Ehdr*) ehdrC;
3185    Elf_Shdr* shdr  = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
3186
3187    /* first find "the" symbol table */
3188    stab = (Elf_Sym*) findElfSection ( ehdrC, SHT_SYMTAB );
3189
3190    /* also go find the string table */
3191    strtab = findElfSection ( ehdrC, SHT_STRTAB );
3192
3193    if (stab == NULL || strtab == NULL) {
3194       errorBelch("%s: can't find string or symbol table", oc->fileName);
3195       return 0;
3196    }
3197
3198    /* Process the relocation sections. */
3199    for (shnum = 0; shnum < ehdr->e_shnum; shnum++) {
3200       if (shdr[shnum].sh_type == SHT_REL) {
3201          ok = do_Elf_Rel_relocations ( oc, ehdrC, shdr,
3202                                        shnum, stab, strtab );
3203          if (!ok) return ok;
3204       }
3205       else
3206       if (shdr[shnum].sh_type == SHT_RELA) {
3207          ok = do_Elf_Rela_relocations ( oc, ehdrC, shdr,
3208                                         shnum, stab, strtab );
3209          if (!ok) return ok;
3210       }
3211    }
3212
3213    /* Free the local symbol table; we won't need it again. */
3214    freeHashTable(oc->lochash, NULL);
3215    oc->lochash = NULL;
3216
3217 #if defined(powerpc_HOST_ARCH)
3218    ocFlushInstructionCache( oc );
3219 #endif
3220
3221    return 1;
3222 }
3223
3224 /*
3225  * IA64 specifics
3226  * Instructions are 41 bits long, packed into 128 bit bundles with a 5-bit template
3227  * at the front.  The following utility functions pack and unpack instructions, and
3228  * take care of the most common relocations.
3229  */
3230
3231 #ifdef ia64_HOST_ARCH
3232
3233 static Elf64_Xword
3234 ia64_extract_instruction(Elf64_Xword *target)
3235 {
3236    Elf64_Xword w1, w2;
3237    int slot = (Elf_Addr)target & 3;
3238    (Elf_Addr)target &= ~3;
3239
3240    w1 = *target;
3241    w2 = *(target+1);
3242
3243    switch (slot)
3244    {
3245       case 0:
3246          return ((w1 >> 5) & 0x1ffffffffff);
3247       case 1:
3248          return (w1 >> 46) | ((w2 & 0x7fffff) << 18);
3249       case 2:
3250          return (w2 >> 23);
3251       default:
3252          barf("ia64_extract_instruction: invalid slot %p", target);
3253    }
3254 }
3255
3256 static void
3257 ia64_deposit_instruction(Elf64_Xword *target, Elf64_Xword value)
3258 {
3259    int slot = (Elf_Addr)target & 3;
3260    (Elf_Addr)target &= ~3;
3261
3262    switch (slot)
3263    {
3264       case 0:
3265          *target |= value << 5;
3266          break;
3267       case 1:
3268          *target |= value << 46;
3269          *(target+1) |= value >> 18;
3270          break;
3271       case 2:
3272          *(target+1) |= value << 23;
3273          break;
3274    }
3275 }
3276
3277 static void
3278 ia64_reloc_gprel22(Elf_Addr target, Elf_Addr value)
3279 {
3280    Elf64_Xword instruction;
3281    Elf64_Sxword rel_value;
3282
3283    rel_value = value - gp_val;
3284    if ((rel_value > 0x1fffff) || (rel_value < -0x1fffff))
3285       barf("GP-relative data out of range (address = 0x%lx, gp = 0x%lx)", value, gp_val);
3286
3287    instruction = ia64_extract_instruction((Elf64_Xword *)target);
3288    instruction |= (((rel_value >> 0) & 0x07f) << 13)            /* imm7b */
3289                     | (((rel_value >> 7) & 0x1ff) << 27)        /* imm9d */
3290                     | (((rel_value >> 16) & 0x01f) << 22)       /* imm5c */
3291                     | ((Elf64_Xword)(rel_value < 0) << 36);     /* s */
3292    ia64_deposit_instruction((Elf64_Xword *)target, instruction);
3293 }
3294
3295 static void
3296 ia64_reloc_pcrel21(Elf_Addr target, Elf_Addr value, ObjectCode *oc)
3297 {
3298    Elf64_Xword instruction;
3299    Elf64_Sxword rel_value;
3300    Elf_Addr entry;
3301
3302    entry = allocatePLTEntry(value, oc);
3303
3304    rel_value = (entry >> 4) - (target >> 4);
3305    if ((rel_value > 0xfffff) || (rel_value < -0xfffff))
3306       barf("PLT entry too far away (entry = 0x%lx, target = 0x%lx)", entry, target);
3307
3308    instruction = ia64_extract_instruction((Elf64_Xword *)target);
3309    instruction |= ((rel_value & 0xfffff) << 13)                 /* imm20b */
3310                     | ((Elf64_Xword)(rel_value < 0) << 36);     /* s */
3311    ia64_deposit_instruction((Elf64_Xword *)target, instruction);
3312 }
3313
3314 #endif /* ia64 */
3315
3316 /*
3317  * PowerPC ELF specifics
3318  */
3319
3320 #ifdef powerpc_HOST_ARCH
3321
3322 static int ocAllocateJumpIslands_ELF( ObjectCode *oc )
3323 {
3324   Elf_Ehdr *ehdr;
3325   Elf_Shdr* shdr;
3326   int i;
3327
3328   ehdr = (Elf_Ehdr *) oc->image;
3329   shdr = (Elf_Shdr *) ( ((char *)oc->image) + ehdr->e_shoff );
3330
3331   for( i = 0; i < ehdr->e_shnum; i++ )
3332     if( shdr[i].sh_type == SHT_SYMTAB )
3333       break;
3334
3335   if( i == ehdr->e_shnum )
3336   {
3337     errorBelch( "This ELF file contains no symtab" );
3338     return 0;
3339   }
3340
3341   if( shdr[i].sh_entsize != sizeof( Elf_Sym ) )
3342   {
3343     errorBelch( "The entry size (%d) of the symtab isn't %d\n",
3344       shdr[i].sh_entsize, sizeof( Elf_Sym ) );
3345
3346     return 0;
3347   }
3348
3349   return ocAllocateJumpIslands( oc, shdr[i].sh_size / sizeof( Elf_Sym ), 0 );
3350 }
3351
3352 #endif /* powerpc */
3353
3354 #endif /* ELF */
3355
3356 /* --------------------------------------------------------------------------
3357  * Mach-O specifics
3358  * ------------------------------------------------------------------------*/
3359
3360 #if defined(OBJFORMAT_MACHO)
3361
3362 /*
3363   Support for MachO linking on Darwin/MacOS X on PowerPC chips
3364   by Wolfgang Thaller (wolfgang.thaller@gmx.net)
3365
3366   I hereby formally apologize for the hackish nature of this code.
3367   Things that need to be done:
3368   *) implement ocVerifyImage_MachO
3369   *) add still more sanity checks.
3370 */
3371
3372 static int ocAllocateJumpIslands_MachO(ObjectCode* oc)
3373 {
3374     struct mach_header *header = (struct mach_header *) oc->image;
3375     struct load_command *lc = (struct load_command *) (header + 1);
3376     unsigned i;
3377
3378     for( i = 0; i < header->ncmds; i++ )
3379     {
3380         if( lc->cmd == LC_SYMTAB )
3381         {
3382                 // Find out the first and last undefined external
3383                 // symbol, so we don't have to allocate too many
3384                 // jump islands.
3385             struct symtab_command *symLC = (struct symtab_command *) lc;
3386             unsigned min = symLC->nsyms, max = 0;
3387             struct nlist *nlist =
3388                 symLC ? (struct nlist*) ((char*) oc->image + symLC->symoff)
3389                       : NULL;
3390             for(i=0;i<symLC->nsyms;i++)
3391             {
3392                 if(nlist[i].n_type & N_STAB)
3393                     ;
3394                 else if(nlist[i].n_type & N_EXT)
3395                 {
3396                     if((nlist[i].n_type & N_TYPE) == N_UNDF
3397                         && (nlist[i].n_value == 0))
3398                     {
3399                         if(i < min)
3400                             min = i;
3401                         if(i > max)
3402                             max = i;
3403                     }
3404                 }
3405             }
3406             if(max >= min)
3407                 return ocAllocateJumpIslands(oc, max - min + 1, min);
3408
3409             break;
3410         }
3411
3412         lc = (struct load_command *) ( ((char *)lc) + lc->cmdsize );
3413     }
3414     return ocAllocateJumpIslands(oc,0,0);
3415 }
3416
3417 static int ocVerifyImage_MachO(ObjectCode* oc STG_UNUSED)
3418 {
3419     // FIXME: do some verifying here
3420     return 1;
3421 }
3422
3423 static int resolveImports(
3424     ObjectCode* oc,
3425     char *image,
3426     struct symtab_command *symLC,
3427     struct section *sect,    // ptr to lazy or non-lazy symbol pointer section
3428     unsigned long *indirectSyms,
3429     struct nlist *nlist)
3430 {
3431     unsigned i;
3432
3433     for(i=0;i*4<sect->size;i++)
3434     {
3435         // according to otool, reserved1 contains the first index into the indirect symbol table
3436         struct nlist *symbol = &nlist[indirectSyms[sect->reserved1+i]];
3437         char *nm = image + symLC->stroff + symbol->n_un.n_strx;
3438         void *addr = NULL;
3439
3440         if((symbol->n_type & N_TYPE) == N_UNDF
3441             && (symbol->n_type & N_EXT) && (symbol->n_value != 0))
3442             addr = (void*) (symbol->n_value);
3443         else if((addr = lookupLocalSymbol(oc,nm)) != NULL)
3444             ;
3445         else
3446             addr = lookupSymbol(nm);
3447         if(!addr)
3448         {
3449             errorBelch("\n%s: unknown symbol `%s'", oc->fileName, nm);
3450             return 0;
3451         }
3452         ASSERT(addr);
3453         checkProddableBlock(oc,((void**)(image + sect->offset)) + i);
3454         ((void**)(image + sect->offset))[i] = addr;
3455     }
3456
3457     return 1;
3458 }
3459
3460 static unsigned long relocateAddress(
3461     ObjectCode* oc,
3462     int nSections,
3463     struct section* sections,
3464     unsigned long address)
3465 {
3466     int i;
3467     for(i = 0; i < nSections; i++)
3468     {
3469         if(sections[i].addr <= address
3470             && address < sections[i].addr + sections[i].size)
3471         {
3472             return (unsigned long)oc->image
3473                     + sections[i].offset + address - sections[i].addr;
3474         }
3475     }
3476     barf("Invalid Mach-O file:"
3477          "Address out of bounds while relocating object file");
3478     return 0;
3479 }
3480
3481 static int relocateSection(
3482     ObjectCode* oc,
3483     char *image,
3484     struct symtab_command *symLC, struct nlist *nlist,
3485     int nSections, struct section* sections, struct section *sect)
3486 {
3487     struct relocation_info *relocs;
3488     int i,n;
3489
3490     if(!strcmp(sect->sectname,"__la_symbol_ptr"))
3491         return 1;
3492     else if(!strcmp(sect->sectname,"__nl_symbol_ptr"))
3493         return 1;
3494
3495     n = sect->nreloc;
3496     relocs = (struct relocation_info*) (image + sect->reloff);
3497
3498     for(i=0;i<n;i++)
3499     {
3500         if(relocs[i].r_address & R_SCATTERED)
3501         {
3502             struct scattered_relocation_info *scat =
3503                 (struct scattered_relocation_info*) &relocs[i];
3504
3505             if(!scat->r_pcrel)
3506             {
3507                 if(scat->r_length == 2)
3508                 {
3509                     unsigned long word = 0;
3510                     unsigned long* wordPtr = (unsigned long*) (image + sect->offset + scat->r_address);
3511                     checkProddableBlock(oc,wordPtr);
3512
3513                     // Step 1: Figure out what the relocated value should be
3514                     if(scat->r_type == GENERIC_RELOC_VANILLA)
3515                     {
3516                         word = *wordPtr + (unsigned long) relocateAddress(
3517                                                                 oc,
3518                                                                 nSections,
3519                                                                 sections,
3520                                                                 scat->r_value)
3521                                         - scat->r_value;
3522                     }
3523                     else if(scat->r_type == PPC_RELOC_SECTDIFF
3524                         || scat->r_type == PPC_RELOC_LO16_SECTDIFF
3525                         || scat->r_type == PPC_RELOC_HI16_SECTDIFF
3526                         || scat->r_type == PPC_RELOC_HA16_SECTDIFF)
3527                     {
3528                         struct scattered_relocation_info *pair =
3529                                 (struct scattered_relocation_info*) &relocs[i+1];
3530
3531                         if(!pair->r_scattered || pair->r_type != PPC_RELOC_PAIR)
3532                             barf("Invalid Mach-O file: "
3533                                  "PPC_RELOC_*_SECTDIFF not followed by PPC_RELOC_PAIR");
3534
3535                         word = (unsigned long)
3536                                (relocateAddress(oc, nSections, sections, scat->r_value)
3537                               - relocateAddress(oc, nSections, sections, pair->r_value));
3538                         i++;
3539                     }
3540                     else if(scat->r_type == PPC_RELOC_HI16
3541                          || scat->r_type == PPC_RELOC_LO16
3542                          || scat->r_type == PPC_RELOC_HA16
3543                          || scat->r_type == PPC_RELOC_LO14)
3544                     {   // these are generated by label+offset things
3545                         struct relocation_info *pair = &relocs[i+1];
3546                         if((pair->r_address & R_SCATTERED) || pair->r_type != PPC_RELOC_PAIR)
3547                             barf("Invalid Mach-O file: "
3548                                  "PPC_RELOC_* not followed by PPC_RELOC_PAIR");
3549
3550                         if(scat->r_type == PPC_RELOC_LO16)
3551                         {
3552                             word = ((unsigned short*) wordPtr)[1];
3553                             word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
3554                         }
3555                         else if(scat->r_type == PPC_RELOC_LO14)
3556                         {
3557                             barf("Unsupported Relocation: PPC_RELOC_LO14");
3558                             word = ((unsigned short*) wordPtr)[1] & 0xFFFC;
3559                             word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
3560                         }
3561                         else if(scat->r_type == PPC_RELOC_HI16)
3562                         {
3563                             word = ((unsigned short*) wordPtr)[1] << 16;
3564                             word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF);
3565                         }
3566                         else if(scat->r_type == PPC_RELOC_HA16)
3567                         {
3568                             word = ((unsigned short*) wordPtr)[1] << 16;
3569                             word += ((short)relocs[i+1].r_address & (short)0xFFFF);
3570                         }
3571
3572
3573                         word += (unsigned long) relocateAddress(oc, nSections, sections, scat->r_value)
3574                                                 - scat->r_value;
3575
3576                         i++;
3577                     }
3578                     else
3579                         continue;  // ignore the others
3580
3581                     if(scat->r_type == GENERIC_RELOC_VANILLA
3582                         || scat->r_type == PPC_RELOC_SECTDIFF)
3583                     {
3584                         *wordPtr = word;
3585                     }
3586                     else if(scat->r_type == PPC_RELOC_LO16_SECTDIFF || scat->r_type == PPC_RELOC_LO16)
3587                     {
3588                         ((unsigned short*) wordPtr)[1] = word & 0xFFFF;
3589                     }
3590                     else if(scat->r_type == PPC_RELOC_HI16_SECTDIFF || scat->r_type == PPC_RELOC_HI16)
3591                     {
3592                         ((unsigned short*) wordPtr)[1] = (word >> 16) & 0xFFFF;
3593                     }
3594                     else if(scat->r_type == PPC_RELOC_HA16_SECTDIFF || scat->r_type == PPC_RELOC_HA16)
3595                     {
3596                         ((unsigned short*) wordPtr)[1] = ((word >> 16) & 0xFFFF)
3597                             + ((word & (1<<15)) ? 1 : 0);
3598                     }
3599                 }
3600             }
3601
3602             continue; // FIXME: I hope it's OK to ignore all the others.
3603         }
3604         else
3605         {
3606             struct relocation_info *reloc = &relocs[i];
3607             if(reloc->r_pcrel && !reloc->r_extern)
3608                 continue;
3609
3610             if(reloc->r_length == 2)
3611             {
3612                 unsigned long word = 0;
3613                 unsigned long jumpIsland = 0;
3614                 long offsetToJumpIsland = 0xBADBAD42; // initialise to bad value
3615                                                       // to avoid warning and to catch
3616                                                       // bugs.
3617
3618                 unsigned long* wordPtr = (unsigned long*) (image + sect->offset + reloc->r_address);
3619                 checkProddableBlock(oc,wordPtr);
3620
3621                 if(reloc->r_type == GENERIC_RELOC_VANILLA)
3622                 {
3623                     word = *wordPtr;
3624                 }
3625                 else if(reloc->r_type == PPC_RELOC_LO16)
3626                 {
3627                     word = ((unsigned short*) wordPtr)[1];
3628                     word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
3629                 }
3630                 else if(reloc->r_type == PPC_RELOC_HI16)
3631                 {
3632                     word = ((unsigned short*) wordPtr)[1] << 16;
3633                     word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF);
3634                 }
3635                 else if(reloc->r_type == PPC_RELOC_HA16)
3636                 {
3637                     word = ((unsigned short*) wordPtr)[1] << 16;
3638                     word += ((short)relocs[i+1].r_address & (short)0xFFFF);
3639                 }
3640                 else if(reloc->r_type == PPC_RELOC_BR24)
3641                 {
3642                     word = *wordPtr;
3643                     word = (word & 0x03FFFFFC) | ((word & 0x02000000) ? 0xFC000000 : 0);
3644                 }
3645
3646
3647                 if(!reloc->r_extern)
3648                 {
3649                     long delta =
3650                         sections[reloc->r_symbolnum-1].offset
3651                         - sections[reloc->r_symbolnum-1].addr
3652                         + ((long) image);
3653
3654                     word += delta;
3655                 }
3656                 else
3657                 {
3658                     struct nlist *symbol = &nlist[reloc->r_symbolnum];
3659                     char *nm = image + symLC->stroff + symbol->n_un.n_strx;
3660                     void *symbolAddress = lookupSymbol(nm);
3661                     if(!symbolAddress)
3662                     {
3663                         errorBelch("\nunknown symbol `%s'", nm);
3664                         return 0;
3665                     }
3666
3667                     if(reloc->r_pcrel)
3668                     {
3669                             // In the .o file, this should be a relative jump to NULL
3670                             // and we'll change it to a jump to a relative jump to the symbol
3671                         ASSERT(-word == reloc->r_address);
3672                         word = (unsigned long) symbolAddress;
3673                         jumpIsland = makeJumpIsland(oc,reloc->r_symbolnum,word);
3674                         word -= ((long)image) + sect->offset + reloc->r_address;
3675                         if(jumpIsland != 0)
3676                         {
3677                             offsetToJumpIsland = jumpIsland
3678                                 - (((long)image) + sect->offset + reloc->r_address);
3679                         }
3680                     }
3681                     else
3682                     {
3683                         word += (unsigned long) symbolAddress;
3684                     }
3685                 }
3686
3687                 if(reloc->r_type == GENERIC_RELOC_VANILLA)
3688                 {
3689                     *wordPtr = word;
3690                     continue;
3691                 }
3692                 else if(reloc->r_type == PPC_RELOC_LO16)
3693                 {
3694                     ((unsigned short*) wordPtr)[1] = word & 0xFFFF;
3695                     i++; continue;
3696                 }
3697                 else if(reloc->r_type == PPC_RELOC_HI16)
3698                 {
3699                     ((unsigned short*) wordPtr)[1] = (word >> 16) & 0xFFFF;
3700                     i++; continue;
3701                 }
3702                 else if(reloc->r_type == PPC_RELOC_HA16)
3703                 {
3704                     ((unsigned short*) wordPtr)[1] = ((word >> 16) & 0xFFFF)
3705                         + ((word & (1<<15)) ? 1 : 0);
3706                     i++; continue;
3707                 }
3708                 else if(reloc->r_type == PPC_RELOC_BR24)
3709                 {
3710                     if((long)word > (long)0x01FFFFFF || (long)word < (long)0xFFE00000)
3711                     {
3712                         // The branch offset is too large.
3713                         // Therefore, we try to use a jump island.
3714                         if(jumpIsland == 0)
3715                         {
3716                             barf("unconditional relative branch out of range: "
3717                                  "no jump island available");
3718                         }
3719
3720                         word = offsetToJumpIsland;
3721                         if((long)word > (long)0x01FFFFFF || (long)word < (long)0xFFE00000)
3722                             barf("unconditional relative branch out of range: "
3723                                  "jump island out of range");
3724                     }
3725                     *wordPtr = (*wordPtr & 0xFC000003) | (word & 0x03FFFFFC);
3726                     continue;
3727                 }
3728             }
3729             barf("\nunknown relocation %d",reloc->r_type);
3730             return 0;
3731         }
3732     }
3733     return 1;
3734 }
3735
3736 static int ocGetNames_MachO(ObjectCode* oc)
3737 {
3738     char *image = (char*) oc->image;
3739     struct mach_header *header = (struct mach_header*) image;
3740     struct load_command *lc = (struct load_command*) (image + sizeof(struct mach_header));
3741     unsigned i,curSymbol = 0;
3742     struct segment_command *segLC = NULL;
3743     struct section *sections;
3744     struct symtab_command *symLC = NULL;
3745     struct nlist *nlist;
3746     unsigned long commonSize = 0;
3747     char    *commonStorage = NULL;
3748     unsigned long commonCounter;
3749
3750     for(i=0;i<header->ncmds;i++)
3751     {
3752         if(lc->cmd == LC_SEGMENT)
3753             segLC = (struct segment_command*) lc;
3754         else if(lc->cmd == LC_SYMTAB)
3755             symLC = (struct symtab_command*) lc;
3756         lc = (struct load_command *) ( ((char*)lc) + lc->cmdsize );
3757     }
3758
3759     sections = (struct section*) (segLC+1);
3760     nlist = symLC ? (struct nlist*) (image + symLC->symoff)
3761                   : NULL;
3762
3763     for(i=0;i<segLC->nsects;i++)
3764     {
3765         if(sections[i].size == 0)
3766             continue;
3767
3768         if((sections[i].flags & SECTION_TYPE) == S_ZEROFILL)
3769         {
3770             char * zeroFillArea = stgCallocBytes(1,sections[i].size,
3771                                       "ocGetNames_MachO(common symbols)");
3772             sections[i].offset = zeroFillArea - image;
3773         }
3774
3775         if(!strcmp(sections[i].sectname,"__text"))
3776             addSection(oc, SECTIONKIND_CODE_OR_RODATA,
3777                 (void*) (image + sections[i].offset),
3778                 (void*) (image + sections[i].offset + sections[i].size));
3779         else if(!strcmp(sections[i].sectname,"__const"))
3780             addSection(oc, SECTIONKIND_RWDATA,
3781                 (void*) (image + sections[i].offset),
3782                 (void*) (image + sections[i].offset + sections[i].size));
3783         else if(!strcmp(sections[i].sectname,"__data"))
3784             addSection(oc, SECTIONKIND_RWDATA,
3785                 (void*) (image + sections[i].offset),
3786                 (void*) (image + sections[i].offset + sections[i].size));
3787         else if(!strcmp(sections[i].sectname,"__bss")
3788                 || !strcmp(sections[i].sectname,"__common"))
3789             addSection(oc, SECTIONKIND_RWDATA,
3790                 (void*) (image + sections[i].offset),
3791                 (void*) (image + sections[i].offset + sections[i].size));
3792
3793         addProddableBlock(oc, (void*) (image + sections[i].offset),
3794                                         sections[i].size);
3795     }
3796
3797         // count external symbols defined here
3798     oc->n_symbols = 0;
3799     if(symLC)
3800     {
3801         for(i=0;i<symLC->nsyms;i++)
3802         {
3803             if(nlist[i].n_type & N_STAB)
3804                 ;
3805             else if(nlist[i].n_type & N_EXT)
3806             {
3807                 if((nlist[i].n_type & N_TYPE) == N_UNDF
3808                     && (nlist[i].n_value != 0))
3809                 {
3810                     commonSize += nlist[i].n_value;
3811                     oc->n_symbols++;
3812                 }
3813                 else if((nlist[i].n_type & N_TYPE) == N_SECT)
3814                     oc->n_symbols++;
3815             }
3816         }
3817     }
3818     oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
3819                                    "ocGetNames_MachO(oc->symbols)");
3820
3821     if(symLC)
3822     {
3823         for(i=0;i<symLC->nsyms;i++)
3824         {
3825             if(nlist[i].n_type & N_STAB)
3826                 ;
3827             else if((nlist[i].n_type & N_TYPE) == N_SECT)
3828             {
3829                 if(nlist[i].n_type & N_EXT)
3830                 {
3831                     char *nm = image + symLC->stroff + nlist[i].n_un.n_strx;
3832                     ghciInsertStrHashTable(oc->fileName, symhash, nm,
3833                                             image
3834                                             + sections[nlist[i].n_sect-1].offset
3835                                             - sections[nlist[i].n_sect-1].addr
3836                                             + nlist[i].n_value);
3837                     oc->symbols[curSymbol++] = nm;
3838                 }
3839                 else
3840                 {
3841                     char *nm = image + symLC->stroff + nlist[i].n_un.n_strx;
3842                     ghciInsertStrHashTable(oc->fileName, oc->lochash, nm,
3843                                             image
3844                                             + sections[nlist[i].n_sect-1].offset
3845                                             - sections[nlist[i].n_sect-1].addr
3846                                             + nlist[i].n_value);
3847                 }
3848             }
3849         }
3850     }
3851
3852     commonStorage = stgCallocBytes(1,commonSize,"ocGetNames_MachO(common symbols)");
3853     commonCounter = (unsigned long)commonStorage;
3854     if(symLC)
3855     {
3856         for(i=0;i<symLC->nsyms;i++)
3857         {
3858             if((nlist[i].n_type & N_TYPE) == N_UNDF
3859                     && (nlist[i].n_type & N_EXT) && (nlist[i].n_value != 0))
3860             {
3861                 char *nm = image + symLC->stroff + nlist[i].n_un.n_strx;
3862                 unsigned long sz = nlist[i].n_value;
3863
3864                 nlist[i].n_value = commonCounter;
3865
3866                 ghciInsertStrHashTable(oc->fileName, symhash, nm,
3867                                        (void*)commonCounter);
3868                 oc->symbols[curSymbol++] = nm;
3869
3870                 commonCounter += sz;
3871             }
3872         }
3873     }
3874     return 1;
3875 }
3876
3877 static int ocResolve_MachO(ObjectCode* oc)
3878 {
3879     char *image = (char*) oc->image;
3880     struct mach_header *header = (struct mach_header*) image;
3881     struct load_command *lc = (struct load_command*) (image + sizeof(struct mach_header));
3882     unsigned i;
3883     struct segment_command *segLC = NULL;
3884     struct section *sections, *la_ptrs = NULL, *nl_ptrs = NULL;
3885     struct symtab_command *symLC = NULL;
3886     struct dysymtab_command *dsymLC = NULL;
3887     struct nlist *nlist;
3888
3889     for(i=0;i<header->ncmds;i++)
3890     {
3891         if(lc->cmd == LC_SEGMENT)
3892             segLC = (struct segment_command*) lc;
3893         else if(lc->cmd == LC_SYMTAB)
3894             symLC = (struct symtab_command*) lc;
3895         else if(lc->cmd == LC_DYSYMTAB)
3896             dsymLC = (struct dysymtab_command*) lc;
3897         lc = (struct load_command *) ( ((char*)lc) + lc->cmdsize );
3898     }
3899
3900     sections = (struct section*) (segLC+1);
3901     nlist = symLC ? (struct nlist*) (image + symLC->symoff)
3902                   : NULL;
3903
3904     for(i=0;i<segLC->nsects;i++)
3905     {
3906         if(!strcmp(sections[i].sectname,"__la_symbol_ptr"))
3907             la_ptrs = &sections[i];
3908         else if(!strcmp(sections[i].sectname,"__nl_symbol_ptr"))
3909             nl_ptrs = &sections[i];
3910     }
3911
3912     if(dsymLC)
3913     {
3914         unsigned long *indirectSyms
3915             = (unsigned long*) (image + dsymLC->indirectsymoff);
3916
3917         if(la_ptrs)
3918             if(!resolveImports(oc,image,symLC,la_ptrs,indirectSyms,nlist))
3919                 return 0;
3920         if(nl_ptrs)
3921             if(!resolveImports(oc,image,symLC,nl_ptrs,indirectSyms,nlist))
3922                 return 0;
3923     }
3924
3925     for(i=0;i<segLC->nsects;i++)
3926     {
3927         if(!relocateSection(oc,image,symLC,nlist,segLC->nsects,sections,&sections[i]))
3928             return 0;
3929     }
3930
3931     /* Free the local symbol table; we won't need it again. */
3932     freeHashTable(oc->lochash, NULL);
3933     oc->lochash = NULL;
3934
3935 #if defined (powerpc_HOST_ARCH)
3936     ocFlushInstructionCache( oc );
3937 #endif
3938
3939     return 1;
3940 }
3941
3942 /*
3943  * The Mach-O object format uses leading underscores. But not everywhere.
3944  * There is a small number of runtime support functions defined in
3945  * libcc_dynamic.a whose name does not have a leading underscore.
3946  * As a consequence, we can't get their address from C code.
3947  * We have to use inline assembler just to take the address of a function.
3948  * Yuck.
3949  */
3950
3951 static void machoInitSymbolsWithoutUnderscore()
3952 {
3953     extern void* symbolsWithoutUnderscore[];
3954     void **p = symbolsWithoutUnderscore;
3955     __asm__ volatile(".globl _symbolsWithoutUnderscore\n.data\n_symbolsWithoutUnderscore:");
3956
3957 #undef Sym
3958 #define Sym(x)  \
3959     __asm__ volatile(".long " # x);
3960
3961     RTS_MACHO_NOUNDERLINE_SYMBOLS
3962
3963     __asm__ volatile(".text");
3964
3965 #undef Sym
3966 #define Sym(x)  \
3967     ghciInsertStrHashTable("(GHCi built-in symbols)", symhash, #x, *p++);
3968
3969     RTS_MACHO_NOUNDERLINE_SYMBOLS
3970
3971 #undef Sym
3972 }
3973 #endif