1 /* -----------------------------------------------------------------------------
3 * (c) The GHC Team, 2000-2004
7 * ---------------------------------------------------------------------------*/
10 #include "PosixSource.h"
13 /* Linux needs _GNU_SOURCE to get RTLD_DEFAULT from <dlfcn.h> and
14 MREMAP_MAYMOVE from <sys/mman.h>.
25 #include "LinkerInternals.h"
29 #include "RtsGlobals.h"
33 #ifdef HAVE_SYS_TYPES_H
34 #include <sys/types.h>
40 #ifdef HAVE_SYS_STAT_H
44 #if defined(HAVE_DLFCN_H)
48 #if defined(cygwin32_HOST_OS)
53 #ifdef HAVE_SYS_TIME_H
57 #include <sys/fcntl.h>
58 #include <sys/termios.h>
59 #include <sys/utime.h>
60 #include <sys/utsname.h>
64 #if defined(ia64_HOST_ARCH) || defined(linux_HOST_OS) || defined(freebsd_HOST_OS) || defined(netbsd_HOST_OS) || defined(openbsd_HOST_OS)
69 #if defined(linux_HOST_OS) || defined(freebsd_HOST_OS) || defined(netbsd_HOST_OS) || defined(openbsd_HOST_OS)
77 #if defined(linux_HOST_OS) || defined(solaris2_HOST_OS) || defined(freebsd_HOST_OS) || defined(netbsd_HOST_OS) || defined(openbsd_HOST_OS)
78 # define OBJFORMAT_ELF
79 #elif defined(cygwin32_HOST_OS) || defined (mingw32_HOST_OS)
80 # define OBJFORMAT_PEi386
83 #elif defined(darwin_HOST_OS)
84 # define OBJFORMAT_MACHO
85 # include <mach-o/loader.h>
86 # include <mach-o/nlist.h>
87 # include <mach-o/reloc.h>
88 #if !defined(HAVE_DLFCN_H)
89 # include <mach-o/dyld.h>
91 #if defined(powerpc_HOST_ARCH)
92 # include <mach-o/ppc/reloc.h>
94 #if defined(x86_64_HOST_ARCH)
95 # include <mach-o/x86_64/reloc.h>
99 /* Hash table mapping symbol names to Symbol */
100 static /*Str*/HashTable *symhash;
102 /* Hash table mapping symbol names to StgStablePtr */
103 static /*Str*/HashTable *stablehash;
105 /* List of currently loaded objects */
106 ObjectCode *objects = NULL; /* initially empty */
108 #if defined(OBJFORMAT_ELF)
109 static int ocVerifyImage_ELF ( ObjectCode* oc );
110 static int ocGetNames_ELF ( ObjectCode* oc );
111 static int ocResolve_ELF ( ObjectCode* oc );
112 #if defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH)
113 static int ocAllocateSymbolExtras_ELF ( ObjectCode* oc );
115 #elif defined(OBJFORMAT_PEi386)
116 static int ocVerifyImage_PEi386 ( ObjectCode* oc );
117 static int ocGetNames_PEi386 ( ObjectCode* oc );
118 static int ocResolve_PEi386 ( ObjectCode* oc );
119 static void *lookupSymbolInDLLs ( unsigned char *lbl );
120 static void zapTrailingAtSign ( unsigned char *sym );
121 #elif defined(OBJFORMAT_MACHO)
122 static int ocVerifyImage_MachO ( ObjectCode* oc );
123 static int ocGetNames_MachO ( ObjectCode* oc );
124 static int ocResolve_MachO ( ObjectCode* oc );
126 static int machoGetMisalignment( FILE * );
127 #if defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH)
128 static int ocAllocateSymbolExtras_MachO ( ObjectCode* oc );
130 #ifdef powerpc_HOST_ARCH
131 static void machoInitSymbolsWithoutUnderscore( void );
135 /* on x86_64 we have a problem with relocating symbol references in
136 * code that was compiled without -fPIC. By default, the small memory
137 * model is used, which assumes that symbol references can fit in a
138 * 32-bit slot. The system dynamic linker makes this work for
139 * references to shared libraries by either (a) allocating a jump
140 * table slot for code references, or (b) moving the symbol at load
141 * time (and copying its contents, if necessary) for data references.
143 * We unfortunately can't tell whether symbol references are to code
144 * or data. So for now we assume they are code (the vast majority
145 * are), and allocate jump-table slots. Unfortunately this will
146 * SILENTLY generate crashing code for data references. This hack is
147 * enabled by X86_64_ELF_NONPIC_HACK.
149 * One workaround is to use shared Haskell libraries. This is
150 * coming. Another workaround is to keep the static libraries but
151 * compile them with -fPIC, because that will generate PIC references
152 * to data which can be relocated. The PIC code is still too green to
153 * do this systematically, though.
156 * See thread http://www.haskell.org/pipermail/cvs-ghc/2007-September/038458.html
158 * Naming Scheme for Symbol Macros
160 * SymI_*: symbol is internal to the RTS. It resides in an object
161 * file/library that is statically.
162 * SymE_*: symbol is external to the RTS library. It might be linked
165 * Sym*_HasProto : the symbol prototype is imported in an include file
166 * or defined explicitly
167 * Sym*_NeedsProto: the symbol is undefined and we add a dummy
168 * default proto extern void sym(void);
170 #define X86_64_ELF_NONPIC_HACK 1
172 /* Link objects into the lower 2Gb on x86_64. GHC assumes the
173 * small memory model on this architecture (see gcc docs,
176 * MAP_32BIT not available on OpenBSD/amd64
178 #if defined(x86_64_HOST_ARCH) && defined(MAP_32BIT)
179 #define TRY_MAP_32BIT MAP_32BIT
181 #define TRY_MAP_32BIT 0
185 * Due to the small memory model (see above), on x86_64 we have to map
186 * all our non-PIC object files into the low 2Gb of the address space
187 * (why 2Gb and not 4Gb? Because all addresses must be reachable
188 * using a 32-bit signed PC-relative offset). On Linux we can do this
189 * using the MAP_32BIT flag to mmap(), however on other OSs
190 * (e.g. *BSD, see #2063, and also on Linux inside Xen, see #2512), we
191 * can't do this. So on these systems, we have to pick a base address
192 * in the low 2Gb of the address space and try to allocate memory from
195 * We pick a default address based on the OS, but also make this
196 * configurable via an RTS flag (+RTS -xm)
198 #if defined(x86_64_HOST_ARCH)
200 #if defined(MAP_32BIT)
201 // Try to use MAP_32BIT
202 #define MMAP_32BIT_BASE_DEFAULT 0
205 #define MMAP_32BIT_BASE_DEFAULT 0x40000000
208 static void *mmap_32bit_base = (void *)MMAP_32BIT_BASE_DEFAULT;
211 /* MAP_ANONYMOUS is MAP_ANON on some systems, e.g. OpenBSD */
212 #if !defined(MAP_ANONYMOUS) && defined(MAP_ANON)
213 #define MAP_ANONYMOUS MAP_ANON
216 /* -----------------------------------------------------------------------------
217 * Built-in symbols from the RTS
220 typedef struct _RtsSymbolVal {
225 #define Maybe_Stable_Names SymI_HasProto(mkWeakzh_fast) \
226 SymI_HasProto(mkWeakForeignEnvzh_fast) \
227 SymI_HasProto(makeStableNamezh_fast) \
228 SymI_HasProto(finalizzeWeakzh_fast)
230 #if !defined (mingw32_HOST_OS)
231 #define RTS_POSIX_ONLY_SYMBOLS \
232 SymI_HasProto(shutdownHaskellAndSignal) \
233 SymI_NeedsProto(lockFile) \
234 SymI_NeedsProto(unlockFile) \
235 SymI_HasProto(signal_handlers) \
236 SymI_HasProto(stg_sig_install) \
237 SymI_NeedsProto(nocldstop)
240 #if defined (cygwin32_HOST_OS)
241 #define RTS_MINGW_ONLY_SYMBOLS /**/
242 /* Don't have the ability to read import libs / archives, so
243 * we have to stupidly list a lot of what libcygwin.a
246 #define RTS_CYGWIN_ONLY_SYMBOLS \
247 SymI_HasProto(regfree) \
248 SymI_HasProto(regexec) \
249 SymI_HasProto(regerror) \
250 SymI_HasProto(regcomp) \
251 SymI_HasProto(__errno) \
252 SymI_HasProto(access) \
253 SymI_HasProto(chmod) \
254 SymI_HasProto(chdir) \
255 SymI_HasProto(close) \
256 SymI_HasProto(creat) \
258 SymI_HasProto(dup2) \
259 SymI_HasProto(fstat) \
260 SymI_HasProto(fcntl) \
261 SymI_HasProto(getcwd) \
262 SymI_HasProto(getenv) \
263 SymI_HasProto(lseek) \
264 SymI_HasProto(open) \
265 SymI_HasProto(fpathconf) \
266 SymI_HasProto(pathconf) \
267 SymI_HasProto(stat) \
269 SymI_HasProto(tanh) \
270 SymI_HasProto(cosh) \
271 SymI_HasProto(sinh) \
272 SymI_HasProto(atan) \
273 SymI_HasProto(acos) \
274 SymI_HasProto(asin) \
280 SymI_HasProto(sqrt) \
281 SymI_HasProto(localtime_r) \
282 SymI_HasProto(gmtime_r) \
283 SymI_HasProto(mktime) \
284 SymI_NeedsProto(_imp___tzname) \
285 SymI_HasProto(gettimeofday) \
286 SymI_HasProto(timezone) \
287 SymI_HasProto(tcgetattr) \
288 SymI_HasProto(tcsetattr) \
289 SymI_HasProto(memcpy) \
290 SymI_HasProto(memmove) \
291 SymI_HasProto(realloc) \
292 SymI_HasProto(malloc) \
293 SymI_HasProto(free) \
294 SymI_HasProto(fork) \
295 SymI_HasProto(lstat) \
296 SymI_HasProto(isatty) \
297 SymI_HasProto(mkdir) \
298 SymI_HasProto(opendir) \
299 SymI_HasProto(readdir) \
300 SymI_HasProto(rewinddir) \
301 SymI_HasProto(closedir) \
302 SymI_HasProto(link) \
303 SymI_HasProto(mkfifo) \
304 SymI_HasProto(pipe) \
305 SymI_HasProto(read) \
306 SymI_HasProto(rename) \
307 SymI_HasProto(rmdir) \
308 SymI_HasProto(select) \
309 SymI_HasProto(system) \
310 SymI_HasProto(write) \
311 SymI_HasProto(strcmp) \
312 SymI_HasProto(strcpy) \
313 SymI_HasProto(strncpy) \
314 SymI_HasProto(strerror) \
315 SymI_HasProto(sigaddset) \
316 SymI_HasProto(sigemptyset) \
317 SymI_HasProto(sigprocmask) \
318 SymI_HasProto(umask) \
319 SymI_HasProto(uname) \
320 SymI_HasProto(unlink) \
321 SymI_HasProto(utime) \
322 SymI_HasProto(waitpid)
324 #elif !defined(mingw32_HOST_OS)
325 #define RTS_MINGW_ONLY_SYMBOLS /**/
326 #define RTS_CYGWIN_ONLY_SYMBOLS /**/
327 #else /* defined(mingw32_HOST_OS) */
328 #define RTS_POSIX_ONLY_SYMBOLS /**/
329 #define RTS_CYGWIN_ONLY_SYMBOLS /**/
331 /* Extra syms gen'ed by mingw-2's gcc-3.2: */
333 #define RTS_MINGW_EXTRA_SYMS \
334 SymI_NeedsProto(_imp____mb_cur_max) \
335 SymI_NeedsProto(_imp___pctype)
337 #define RTS_MINGW_EXTRA_SYMS
340 #if HAVE_GETTIMEOFDAY
341 #define RTS_MINGW_GETTIMEOFDAY_SYM SymI_NeedsProto(gettimeofday)
343 #define RTS_MINGW_GETTIMEOFDAY_SYM /**/
346 #if HAVE___MINGW_VFPRINTF
347 #define RTS___MINGW_VFPRINTF_SYM SymI_HasProto(__mingw_vfprintf)
349 #define RTS___MINGW_VFPRINTF_SYM /**/
352 /* These are statically linked from the mingw libraries into the ghc
353 executable, so we have to employ this hack. */
354 #define RTS_MINGW_ONLY_SYMBOLS \
355 SymI_HasProto(asyncReadzh_fast) \
356 SymI_HasProto(asyncWritezh_fast) \
357 SymI_HasProto(asyncDoProczh_fast) \
358 SymI_HasProto(memset) \
359 SymI_HasProto(inet_ntoa) \
360 SymI_HasProto(inet_addr) \
361 SymI_HasProto(htonl) \
362 SymI_HasProto(recvfrom) \
363 SymI_HasProto(listen) \
364 SymI_HasProto(bind) \
365 SymI_HasProto(shutdown) \
366 SymI_HasProto(connect) \
367 SymI_HasProto(htons) \
368 SymI_HasProto(ntohs) \
369 SymI_HasProto(getservbyname) \
370 SymI_HasProto(getservbyport) \
371 SymI_HasProto(getprotobynumber) \
372 SymI_HasProto(getprotobyname) \
373 SymI_HasProto(gethostbyname) \
374 SymI_HasProto(gethostbyaddr) \
375 SymI_HasProto(gethostname) \
376 SymI_HasProto(strcpy) \
377 SymI_HasProto(strncpy) \
378 SymI_HasProto(abort) \
379 SymI_NeedsProto(_alloca) \
380 SymI_NeedsProto(isxdigit) \
381 SymI_NeedsProto(isupper) \
382 SymI_NeedsProto(ispunct) \
383 SymI_NeedsProto(islower) \
384 SymI_NeedsProto(isspace) \
385 SymI_NeedsProto(isprint) \
386 SymI_NeedsProto(isdigit) \
387 SymI_NeedsProto(iscntrl) \
388 SymI_NeedsProto(isalpha) \
389 SymI_NeedsProto(isalnum) \
390 SymI_NeedsProto(isascii) \
391 RTS___MINGW_VFPRINTF_SYM \
392 SymI_HasProto(strcmp) \
393 SymI_HasProto(memmove) \
394 SymI_HasProto(realloc) \
395 SymI_HasProto(malloc) \
397 SymI_HasProto(tanh) \
398 SymI_HasProto(cosh) \
399 SymI_HasProto(sinh) \
400 SymI_HasProto(atan) \
401 SymI_HasProto(acos) \
402 SymI_HasProto(asin) \
408 SymI_HasProto(sqrt) \
409 SymI_HasProto(powf) \
410 SymI_HasProto(tanhf) \
411 SymI_HasProto(coshf) \
412 SymI_HasProto(sinhf) \
413 SymI_HasProto(atanf) \
414 SymI_HasProto(acosf) \
415 SymI_HasProto(asinf) \
416 SymI_HasProto(tanf) \
417 SymI_HasProto(cosf) \
418 SymI_HasProto(sinf) \
419 SymI_HasProto(expf) \
420 SymI_HasProto(logf) \
421 SymI_HasProto(sqrtf) \
422 SymI_HasProto(memcpy) \
423 SymI_HasProto(rts_InstallConsoleEvent) \
424 SymI_HasProto(rts_ConsoleHandlerDone) \
425 SymI_NeedsProto(mktime) \
426 SymI_NeedsProto(_imp___timezone) \
427 SymI_NeedsProto(_imp___tzname) \
428 SymI_NeedsProto(_imp__tzname) \
429 SymI_NeedsProto(_imp___iob) \
430 SymI_NeedsProto(_imp___osver) \
431 SymI_NeedsProto(localtime) \
432 SymI_NeedsProto(gmtime) \
433 SymI_NeedsProto(opendir) \
434 SymI_NeedsProto(readdir) \
435 SymI_NeedsProto(rewinddir) \
436 RTS_MINGW_EXTRA_SYMS \
437 RTS_MINGW_GETTIMEOFDAY_SYM \
438 SymI_NeedsProto(closedir)
441 #if defined(darwin_TARGET_OS) && HAVE_PRINTF_LDBLSTUB
442 #define RTS_DARWIN_ONLY_SYMBOLS \
443 SymI_NeedsProto(asprintf$LDBLStub) \
444 SymI_NeedsProto(err$LDBLStub) \
445 SymI_NeedsProto(errc$LDBLStub) \
446 SymI_NeedsProto(errx$LDBLStub) \
447 SymI_NeedsProto(fprintf$LDBLStub) \
448 SymI_NeedsProto(fscanf$LDBLStub) \
449 SymI_NeedsProto(fwprintf$LDBLStub) \
450 SymI_NeedsProto(fwscanf$LDBLStub) \
451 SymI_NeedsProto(printf$LDBLStub) \
452 SymI_NeedsProto(scanf$LDBLStub) \
453 SymI_NeedsProto(snprintf$LDBLStub) \
454 SymI_NeedsProto(sprintf$LDBLStub) \
455 SymI_NeedsProto(sscanf$LDBLStub) \
456 SymI_NeedsProto(strtold$LDBLStub) \
457 SymI_NeedsProto(swprintf$LDBLStub) \
458 SymI_NeedsProto(swscanf$LDBLStub) \
459 SymI_NeedsProto(syslog$LDBLStub) \
460 SymI_NeedsProto(vasprintf$LDBLStub) \
461 SymI_NeedsProto(verr$LDBLStub) \
462 SymI_NeedsProto(verrc$LDBLStub) \
463 SymI_NeedsProto(verrx$LDBLStub) \
464 SymI_NeedsProto(vfprintf$LDBLStub) \
465 SymI_NeedsProto(vfscanf$LDBLStub) \
466 SymI_NeedsProto(vfwprintf$LDBLStub) \
467 SymI_NeedsProto(vfwscanf$LDBLStub) \
468 SymI_NeedsProto(vprintf$LDBLStub) \
469 SymI_NeedsProto(vscanf$LDBLStub) \
470 SymI_NeedsProto(vsnprintf$LDBLStub) \
471 SymI_NeedsProto(vsprintf$LDBLStub) \
472 SymI_NeedsProto(vsscanf$LDBLStub) \
473 SymI_NeedsProto(vswprintf$LDBLStub) \
474 SymI_NeedsProto(vswscanf$LDBLStub) \
475 SymI_NeedsProto(vsyslog$LDBLStub) \
476 SymI_NeedsProto(vwarn$LDBLStub) \
477 SymI_NeedsProto(vwarnc$LDBLStub) \
478 SymI_NeedsProto(vwarnx$LDBLStub) \
479 SymI_NeedsProto(vwprintf$LDBLStub) \
480 SymI_NeedsProto(vwscanf$LDBLStub) \
481 SymI_NeedsProto(warn$LDBLStub) \
482 SymI_NeedsProto(warnc$LDBLStub) \
483 SymI_NeedsProto(warnx$LDBLStub) \
484 SymI_NeedsProto(wcstold$LDBLStub) \
485 SymI_NeedsProto(wprintf$LDBLStub) \
486 SymI_NeedsProto(wscanf$LDBLStub)
488 #define RTS_DARWIN_ONLY_SYMBOLS
492 # define MAIN_CAP_SYM SymI_HasProto(MainCapability)
494 # define MAIN_CAP_SYM
497 #if !defined(mingw32_HOST_OS)
498 #define RTS_USER_SIGNALS_SYMBOLS \
499 SymI_HasProto(setIOManagerPipe) \
500 SymI_NeedsProto(blockUserSignals) \
501 SymI_NeedsProto(unblockUserSignals)
503 #define RTS_USER_SIGNALS_SYMBOLS \
504 SymI_HasProto(sendIOManagerEvent) \
505 SymI_HasProto(readIOManagerEvent) \
506 SymI_HasProto(getIOManagerEvent) \
507 SymI_HasProto(console_handler)
510 #define RTS_LIBFFI_SYMBOLS \
511 SymE_NeedsProto(ffi_prep_cif) \
512 SymE_NeedsProto(ffi_call) \
513 SymE_NeedsProto(ffi_type_void) \
514 SymE_NeedsProto(ffi_type_float) \
515 SymE_NeedsProto(ffi_type_double) \
516 SymE_NeedsProto(ffi_type_sint64) \
517 SymE_NeedsProto(ffi_type_uint64) \
518 SymE_NeedsProto(ffi_type_sint32) \
519 SymE_NeedsProto(ffi_type_uint32) \
520 SymE_NeedsProto(ffi_type_sint16) \
521 SymE_NeedsProto(ffi_type_uint16) \
522 SymE_NeedsProto(ffi_type_sint8) \
523 SymE_NeedsProto(ffi_type_uint8) \
524 SymE_NeedsProto(ffi_type_pointer)
526 #ifdef TABLES_NEXT_TO_CODE
527 #define RTS_RET_SYMBOLS /* nothing */
529 #define RTS_RET_SYMBOLS \
530 SymI_HasProto(stg_enter_ret) \
531 SymI_HasProto(stg_gc_fun_ret) \
532 SymI_HasProto(stg_ap_v_ret) \
533 SymI_HasProto(stg_ap_f_ret) \
534 SymI_HasProto(stg_ap_d_ret) \
535 SymI_HasProto(stg_ap_l_ret) \
536 SymI_HasProto(stg_ap_n_ret) \
537 SymI_HasProto(stg_ap_p_ret) \
538 SymI_HasProto(stg_ap_pv_ret) \
539 SymI_HasProto(stg_ap_pp_ret) \
540 SymI_HasProto(stg_ap_ppv_ret) \
541 SymI_HasProto(stg_ap_ppp_ret) \
542 SymI_HasProto(stg_ap_pppv_ret) \
543 SymI_HasProto(stg_ap_pppp_ret) \
544 SymI_HasProto(stg_ap_ppppp_ret) \
545 SymI_HasProto(stg_ap_pppppp_ret)
548 #define RTS_SYMBOLS \
550 SymI_HasProto(StgReturn) \
551 SymI_HasProto(stg_enter_info) \
552 SymI_HasProto(stg_gc_void_info) \
553 SymI_HasProto(__stg_gc_enter_1) \
554 SymI_HasProto(stg_gc_noregs) \
555 SymI_HasProto(stg_gc_unpt_r1_info) \
556 SymI_HasProto(stg_gc_unpt_r1) \
557 SymI_HasProto(stg_gc_unbx_r1_info) \
558 SymI_HasProto(stg_gc_unbx_r1) \
559 SymI_HasProto(stg_gc_f1_info) \
560 SymI_HasProto(stg_gc_f1) \
561 SymI_HasProto(stg_gc_d1_info) \
562 SymI_HasProto(stg_gc_d1) \
563 SymI_HasProto(stg_gc_l1_info) \
564 SymI_HasProto(stg_gc_l1) \
565 SymI_HasProto(__stg_gc_fun) \
566 SymI_HasProto(stg_gc_fun_info) \
567 SymI_HasProto(stg_gc_gen) \
568 SymI_HasProto(stg_gc_gen_info) \
569 SymI_HasProto(stg_gc_gen_hp) \
570 SymI_HasProto(stg_gc_ut) \
571 SymI_HasProto(stg_gen_yield) \
572 SymI_HasProto(stg_yield_noregs) \
573 SymI_HasProto(stg_yield_to_interpreter) \
574 SymI_HasProto(stg_gen_block) \
575 SymI_HasProto(stg_block_noregs) \
576 SymI_HasProto(stg_block_1) \
577 SymI_HasProto(stg_block_takemvar) \
578 SymI_HasProto(stg_block_putmvar) \
580 SymI_HasProto(MallocFailHook) \
581 SymI_HasProto(OnExitHook) \
582 SymI_HasProto(OutOfHeapHook) \
583 SymI_HasProto(StackOverflowHook) \
584 SymI_HasProto(addDLL) \
585 SymI_HasProto(__int_encodeDouble) \
586 SymI_HasProto(__word_encodeDouble) \
587 SymI_HasProto(__2Int_encodeDouble) \
588 SymI_HasProto(__int_encodeFloat) \
589 SymI_HasProto(__word_encodeFloat) \
590 SymI_HasProto(atomicallyzh_fast) \
591 SymI_HasProto(barf) \
592 SymI_HasProto(debugBelch) \
593 SymI_HasProto(errorBelch) \
594 SymI_HasProto(sysErrorBelch) \
595 SymI_HasProto(asyncExceptionsBlockedzh_fast) \
596 SymI_HasProto(blockAsyncExceptionszh_fast) \
597 SymI_HasProto(catchzh_fast) \
598 SymI_HasProto(catchRetryzh_fast) \
599 SymI_HasProto(catchSTMzh_fast) \
600 SymI_HasProto(checkzh_fast) \
601 SymI_HasProto(closure_flags) \
602 SymI_HasProto(cmp_thread) \
603 SymI_HasProto(createAdjustor) \
604 SymI_HasProto(decodeDoublezu2Intzh_fast) \
605 SymI_HasProto(decodeFloatzuIntzh_fast) \
606 SymI_HasProto(defaultsHook) \
607 SymI_HasProto(delayzh_fast) \
608 SymI_HasProto(deRefWeakzh_fast) \
609 SymI_HasProto(deRefStablePtrzh_fast) \
610 SymI_HasProto(dirty_MUT_VAR) \
611 SymI_HasProto(forkzh_fast) \
612 SymI_HasProto(forkOnzh_fast) \
613 SymI_HasProto(forkProcess) \
614 SymI_HasProto(forkOS_createThread) \
615 SymI_HasProto(freeHaskellFunctionPtr) \
616 SymI_HasProto(freeStablePtr) \
617 SymI_HasProto(getOrSetTypeableStore) \
618 SymI_HasProto(getOrSetSignalHandlerStore) \
619 SymI_HasProto(genSymZh) \
620 SymI_HasProto(genericRaise) \
621 SymI_HasProto(getProgArgv) \
622 SymI_HasProto(getFullProgArgv) \
623 SymI_HasProto(getStablePtr) \
624 SymI_HasProto(hs_init) \
625 SymI_HasProto(hs_exit) \
626 SymI_HasProto(hs_set_argv) \
627 SymI_HasProto(hs_add_root) \
628 SymI_HasProto(hs_perform_gc) \
629 SymI_HasProto(hs_free_stable_ptr) \
630 SymI_HasProto(hs_free_fun_ptr) \
631 SymI_HasProto(hs_hpc_rootModule) \
632 SymI_HasProto(hs_hpc_module) \
633 SymI_HasProto(initLinker) \
634 SymI_HasProto(unpackClosurezh_fast) \
635 SymI_HasProto(getApStackValzh_fast) \
636 SymI_HasProto(getSparkzh_fast) \
637 SymI_HasProto(isCurrentThreadBoundzh_fast) \
638 SymI_HasProto(isDoubleDenormalized) \
639 SymI_HasProto(isDoubleInfinite) \
640 SymI_HasProto(isDoubleNaN) \
641 SymI_HasProto(isDoubleNegativeZero) \
642 SymI_HasProto(isEmptyMVarzh_fast) \
643 SymI_HasProto(isFloatDenormalized) \
644 SymI_HasProto(isFloatInfinite) \
645 SymI_HasProto(isFloatNaN) \
646 SymI_HasProto(isFloatNegativeZero) \
647 SymI_HasProto(killThreadzh_fast) \
648 SymI_HasProto(loadObj) \
649 SymI_HasProto(insertStableSymbol) \
650 SymI_HasProto(insertSymbol) \
651 SymI_HasProto(lookupSymbol) \
652 SymI_HasProto(makeStablePtrzh_fast) \
653 SymI_HasProto(mkApUpd0zh_fast) \
654 SymI_HasProto(myThreadIdzh_fast) \
655 SymI_HasProto(labelThreadzh_fast) \
656 SymI_HasProto(newArrayzh_fast) \
657 SymI_HasProto(newBCOzh_fast) \
658 SymI_HasProto(newByteArrayzh_fast) \
659 SymI_HasProto_redirect(newCAF, newDynCAF) \
660 SymI_HasProto(newMVarzh_fast) \
661 SymI_HasProto(newMutVarzh_fast) \
662 SymI_HasProto(newTVarzh_fast) \
663 SymI_HasProto(noDuplicatezh_fast) \
664 SymI_HasProto(atomicModifyMutVarzh_fast) \
665 SymI_HasProto(newPinnedByteArrayzh_fast) \
666 SymI_HasProto(newAlignedPinnedByteArrayzh_fast) \
667 SymI_HasProto(newSpark) \
668 SymI_HasProto(performGC) \
669 SymI_HasProto(performMajorGC) \
670 SymI_HasProto(prog_argc) \
671 SymI_HasProto(prog_argv) \
672 SymI_HasProto(putMVarzh_fast) \
673 SymI_HasProto(raisezh_fast) \
674 SymI_HasProto(raiseIOzh_fast) \
675 SymI_HasProto(readTVarzh_fast) \
676 SymI_HasProto(readTVarIOzh_fast) \
677 SymI_HasProto(resetNonBlockingFd) \
678 SymI_HasProto(resumeThread) \
679 SymI_HasProto(resolveObjs) \
680 SymI_HasProto(retryzh_fast) \
681 SymI_HasProto(rts_apply) \
682 SymI_HasProto(rts_checkSchedStatus) \
683 SymI_HasProto(rts_eval) \
684 SymI_HasProto(rts_evalIO) \
685 SymI_HasProto(rts_evalLazyIO) \
686 SymI_HasProto(rts_evalStableIO) \
687 SymI_HasProto(rts_eval_) \
688 SymI_HasProto(rts_getBool) \
689 SymI_HasProto(rts_getChar) \
690 SymI_HasProto(rts_getDouble) \
691 SymI_HasProto(rts_getFloat) \
692 SymI_HasProto(rts_getInt) \
693 SymI_HasProto(rts_getInt8) \
694 SymI_HasProto(rts_getInt16) \
695 SymI_HasProto(rts_getInt32) \
696 SymI_HasProto(rts_getInt64) \
697 SymI_HasProto(rts_getPtr) \
698 SymI_HasProto(rts_getFunPtr) \
699 SymI_HasProto(rts_getStablePtr) \
700 SymI_HasProto(rts_getThreadId) \
701 SymI_HasProto(rts_getWord) \
702 SymI_HasProto(rts_getWord8) \
703 SymI_HasProto(rts_getWord16) \
704 SymI_HasProto(rts_getWord32) \
705 SymI_HasProto(rts_getWord64) \
706 SymI_HasProto(rts_lock) \
707 SymI_HasProto(rts_mkBool) \
708 SymI_HasProto(rts_mkChar) \
709 SymI_HasProto(rts_mkDouble) \
710 SymI_HasProto(rts_mkFloat) \
711 SymI_HasProto(rts_mkInt) \
712 SymI_HasProto(rts_mkInt8) \
713 SymI_HasProto(rts_mkInt16) \
714 SymI_HasProto(rts_mkInt32) \
715 SymI_HasProto(rts_mkInt64) \
716 SymI_HasProto(rts_mkPtr) \
717 SymI_HasProto(rts_mkFunPtr) \
718 SymI_HasProto(rts_mkStablePtr) \
719 SymI_HasProto(rts_mkString) \
720 SymI_HasProto(rts_mkWord) \
721 SymI_HasProto(rts_mkWord8) \
722 SymI_HasProto(rts_mkWord16) \
723 SymI_HasProto(rts_mkWord32) \
724 SymI_HasProto(rts_mkWord64) \
725 SymI_HasProto(rts_unlock) \
726 SymI_HasProto(rts_unsafeGetMyCapability) \
727 SymI_HasProto(rtsSupportsBoundThreads) \
728 SymI_HasProto(__hscore_get_saved_termios) \
729 SymI_HasProto(__hscore_set_saved_termios) \
730 SymI_HasProto(setProgArgv) \
731 SymI_HasProto(startupHaskell) \
732 SymI_HasProto(shutdownHaskell) \
733 SymI_HasProto(shutdownHaskellAndExit) \
734 SymI_HasProto(stable_ptr_table) \
735 SymI_HasProto(stackOverflow) \
736 SymI_HasProto(stg_CAF_BLACKHOLE_info) \
737 SymI_HasProto(__stg_EAGER_BLACKHOLE_info) \
738 SymI_HasProto(awakenBlockedQueue) \
739 SymI_HasProto(startTimer) \
740 SymI_HasProto(stg_CHARLIKE_closure) \
741 SymI_HasProto(stg_MVAR_CLEAN_info) \
742 SymI_HasProto(stg_MVAR_DIRTY_info) \
743 SymI_HasProto(stg_IND_STATIC_info) \
744 SymI_HasProto(stg_INTLIKE_closure) \
745 SymI_HasProto(stg_ARR_WORDS_info) \
746 SymI_HasProto(stg_MUT_ARR_PTRS_DIRTY_info) \
747 SymI_HasProto(stg_MUT_ARR_PTRS_FROZEN_info) \
748 SymI_HasProto(stg_MUT_ARR_PTRS_FROZEN0_info) \
749 SymI_HasProto(stg_WEAK_info) \
750 SymI_HasProto(stg_ap_v_info) \
751 SymI_HasProto(stg_ap_f_info) \
752 SymI_HasProto(stg_ap_d_info) \
753 SymI_HasProto(stg_ap_l_info) \
754 SymI_HasProto(stg_ap_n_info) \
755 SymI_HasProto(stg_ap_p_info) \
756 SymI_HasProto(stg_ap_pv_info) \
757 SymI_HasProto(stg_ap_pp_info) \
758 SymI_HasProto(stg_ap_ppv_info) \
759 SymI_HasProto(stg_ap_ppp_info) \
760 SymI_HasProto(stg_ap_pppv_info) \
761 SymI_HasProto(stg_ap_pppp_info) \
762 SymI_HasProto(stg_ap_ppppp_info) \
763 SymI_HasProto(stg_ap_pppppp_info) \
764 SymI_HasProto(stg_ap_0_fast) \
765 SymI_HasProto(stg_ap_v_fast) \
766 SymI_HasProto(stg_ap_f_fast) \
767 SymI_HasProto(stg_ap_d_fast) \
768 SymI_HasProto(stg_ap_l_fast) \
769 SymI_HasProto(stg_ap_n_fast) \
770 SymI_HasProto(stg_ap_p_fast) \
771 SymI_HasProto(stg_ap_pv_fast) \
772 SymI_HasProto(stg_ap_pp_fast) \
773 SymI_HasProto(stg_ap_ppv_fast) \
774 SymI_HasProto(stg_ap_ppp_fast) \
775 SymI_HasProto(stg_ap_pppv_fast) \
776 SymI_HasProto(stg_ap_pppp_fast) \
777 SymI_HasProto(stg_ap_ppppp_fast) \
778 SymI_HasProto(stg_ap_pppppp_fast) \
779 SymI_HasProto(stg_ap_1_upd_info) \
780 SymI_HasProto(stg_ap_2_upd_info) \
781 SymI_HasProto(stg_ap_3_upd_info) \
782 SymI_HasProto(stg_ap_4_upd_info) \
783 SymI_HasProto(stg_ap_5_upd_info) \
784 SymI_HasProto(stg_ap_6_upd_info) \
785 SymI_HasProto(stg_ap_7_upd_info) \
786 SymI_HasProto(stg_exit) \
787 SymI_HasProto(stg_sel_0_upd_info) \
788 SymI_HasProto(stg_sel_10_upd_info) \
789 SymI_HasProto(stg_sel_11_upd_info) \
790 SymI_HasProto(stg_sel_12_upd_info) \
791 SymI_HasProto(stg_sel_13_upd_info) \
792 SymI_HasProto(stg_sel_14_upd_info) \
793 SymI_HasProto(stg_sel_15_upd_info) \
794 SymI_HasProto(stg_sel_1_upd_info) \
795 SymI_HasProto(stg_sel_2_upd_info) \
796 SymI_HasProto(stg_sel_3_upd_info) \
797 SymI_HasProto(stg_sel_4_upd_info) \
798 SymI_HasProto(stg_sel_5_upd_info) \
799 SymI_HasProto(stg_sel_6_upd_info) \
800 SymI_HasProto(stg_sel_7_upd_info) \
801 SymI_HasProto(stg_sel_8_upd_info) \
802 SymI_HasProto(stg_sel_9_upd_info) \
803 SymI_HasProto(stg_upd_frame_info) \
804 SymI_HasProto(suspendThread) \
805 SymI_HasProto(takeMVarzh_fast) \
806 SymI_HasProto(threadStatuszh_fast) \
807 SymI_HasProto(tryPutMVarzh_fast) \
808 SymI_HasProto(tryTakeMVarzh_fast) \
809 SymI_HasProto(unblockAsyncExceptionszh_fast) \
810 SymI_HasProto(unloadObj) \
811 SymI_HasProto(unsafeThawArrayzh_fast) \
812 SymI_HasProto(waitReadzh_fast) \
813 SymI_HasProto(waitWritezh_fast) \
814 SymI_HasProto(writeTVarzh_fast) \
815 SymI_HasProto(yieldzh_fast) \
816 SymI_NeedsProto(stg_interp_constr_entry) \
817 SymI_HasProto(alloc_blocks) \
818 SymI_HasProto(alloc_blocks_lim) \
819 SymI_HasProto(allocateLocal) \
820 SymI_HasProto(allocateExec) \
821 SymI_HasProto(freeExec) \
822 SymI_HasProto(getAllocations) \
823 SymI_HasProto(revertCAFs) \
824 SymI_HasProto(RtsFlags) \
825 SymI_NeedsProto(rts_breakpoint_io_action) \
826 SymI_NeedsProto(rts_stop_next_breakpoint) \
827 SymI_NeedsProto(rts_stop_on_exception) \
828 SymI_HasProto(stopTimer) \
829 SymI_HasProto(n_capabilities) \
830 SymI_HasProto(traceCcszh_fast) \
831 RTS_USER_SIGNALS_SYMBOLS
834 // 64-bit support functions in libgcc.a
835 #if defined(__GNUC__) && SIZEOF_VOID_P <= 4
836 #define RTS_LIBGCC_SYMBOLS \
837 SymI_NeedsProto(__divdi3) \
838 SymI_NeedsProto(__udivdi3) \
839 SymI_NeedsProto(__moddi3) \
840 SymI_NeedsProto(__umoddi3) \
841 SymI_NeedsProto(__muldi3) \
842 SymI_NeedsProto(__ashldi3) \
843 SymI_NeedsProto(__ashrdi3) \
844 SymI_NeedsProto(__lshrdi3) \
845 SymI_NeedsProto(__eprintf)
846 #elif defined(ia64_HOST_ARCH)
847 #define RTS_LIBGCC_SYMBOLS \
848 SymI_NeedsProto(__divdi3) \
849 SymI_NeedsProto(__udivdi3) \
850 SymI_NeedsProto(__moddi3) \
851 SymI_NeedsProto(__umoddi3) \
852 SymI_NeedsProto(__divsf3) \
853 SymI_NeedsProto(__divdf3)
855 #define RTS_LIBGCC_SYMBOLS
858 #if defined(darwin_HOST_OS) && defined(powerpc_HOST_ARCH)
859 // Symbols that don't have a leading underscore
860 // on Mac OS X. They have to receive special treatment,
861 // see machoInitSymbolsWithoutUnderscore()
862 #define RTS_MACHO_NOUNDERLINE_SYMBOLS \
863 SymI_NeedsProto(saveFP) \
864 SymI_NeedsProto(restFP)
867 /* entirely bogus claims about types of these symbols */
868 #define SymI_NeedsProto(vvv) extern void vvv(void);
869 #if defined(__PIC__) && defined(mingw32_TARGET_OS)
870 #define SymE_HasProto(vvv) SymE_HasProto(vvv);
871 #define SymE_NeedsProto(vvv) extern void _imp__ ## vvv (void);
873 #define SymE_NeedsProto(vvv) SymI_NeedsProto(vvv);
874 #define SymE_HasProto(vvv) SymI_HasProto(vvv)
876 #define SymI_HasProto(vvv) /**/
877 #define SymI_HasProto_redirect(vvv,xxx) /**/
880 RTS_POSIX_ONLY_SYMBOLS
881 RTS_MINGW_ONLY_SYMBOLS
882 RTS_CYGWIN_ONLY_SYMBOLS
883 RTS_DARWIN_ONLY_SYMBOLS
886 #undef SymI_NeedsProto
888 #undef SymI_HasProto_redirect
890 #undef SymE_NeedsProto
892 #ifdef LEADING_UNDERSCORE
893 #define MAYBE_LEADING_UNDERSCORE_STR(s) ("_" s)
895 #define MAYBE_LEADING_UNDERSCORE_STR(s) (s)
898 #define SymI_HasProto(vvv) { MAYBE_LEADING_UNDERSCORE_STR(#vvv), \
900 #define SymE_HasProto(vvv) { MAYBE_LEADING_UNDERSCORE_STR(#vvv), \
901 (void*)DLL_IMPORT_DATA_REF(vvv) },
903 #define SymI_NeedsProto(vvv) SymI_HasProto(vvv)
904 #define SymE_NeedsProto(vvv) SymE_HasProto(vvv)
906 // SymI_HasProto_redirect allows us to redirect references to one symbol to
907 // another symbol. See newCAF/newDynCAF for an example.
908 #define SymI_HasProto_redirect(vvv,xxx) \
909 { MAYBE_LEADING_UNDERSCORE_STR(#vvv), \
912 static RtsSymbolVal rtsSyms[] = {
915 RTS_POSIX_ONLY_SYMBOLS
916 RTS_MINGW_ONLY_SYMBOLS
917 RTS_CYGWIN_ONLY_SYMBOLS
918 RTS_DARWIN_ONLY_SYMBOLS
921 #if defined(darwin_HOST_OS) && defined(i386_HOST_ARCH)
922 // dyld stub code contains references to this,
923 // but it should never be called because we treat
924 // lazy pointers as nonlazy.
925 { "dyld_stub_binding_helper", (void*)0xDEADBEEF },
927 { 0, 0 } /* sentinel */
932 /* -----------------------------------------------------------------------------
933 * Insert symbols into hash tables, checking for duplicates.
936 static void ghciInsertStrHashTable ( char* obj_name,
942 if (lookupHashTable(table, (StgWord)key) == NULL)
944 insertStrHashTable(table, (StgWord)key, data);
949 "GHCi runtime linker: fatal error: I found a duplicate definition for symbol\n"
951 "whilst processing object file\n"
953 "This could be caused by:\n"
954 " * Loading two different object files which export the same symbol\n"
955 " * Specifying the same object file twice on the GHCi command line\n"
956 " * An incorrect `package.conf' entry, causing some object to be\n"
958 "GHCi cannot safely continue in this situation. Exiting now. Sorry.\n"
965 /* -----------------------------------------------------------------------------
966 * initialize the object linker
970 static int linker_init_done = 0 ;
972 #if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
973 static void *dl_prog_handle;
981 /* Make initLinker idempotent, so we can call it
982 before evey relevant operation; that means we
983 don't need to initialise the linker separately */
984 if (linker_init_done == 1) { return; } else {
985 linker_init_done = 1;
988 stablehash = allocStrHashTable();
989 symhash = allocStrHashTable();
991 /* populate the symbol table with stuff from the RTS */
992 for (sym = rtsSyms; sym->lbl != NULL; sym++) {
993 ghciInsertStrHashTable("(GHCi built-in symbols)",
994 symhash, sym->lbl, sym->addr);
996 # if defined(OBJFORMAT_MACHO) && defined(powerpc_HOST_ARCH)
997 machoInitSymbolsWithoutUnderscore();
1000 # if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
1001 # if defined(RTLD_DEFAULT)
1002 dl_prog_handle = RTLD_DEFAULT;
1004 dl_prog_handle = dlopen(NULL, RTLD_LAZY);
1005 # endif /* RTLD_DEFAULT */
1008 #if defined(x86_64_HOST_ARCH)
1009 if (RtsFlags.MiscFlags.linkerMemBase != 0) {
1010 // User-override for mmap_32bit_base
1011 mmap_32bit_base = (void*)RtsFlags.MiscFlags.linkerMemBase;
1015 #if defined(mingw32_HOST_OS)
1017 * These two libraries cause problems when added to the static link,
1018 * but are necessary for resolving symbols in GHCi, hence we load
1019 * them manually here.
1026 /* -----------------------------------------------------------------------------
1027 * Loading DLL or .so dynamic libraries
1028 * -----------------------------------------------------------------------------
1030 * Add a DLL from which symbols may be found. In the ELF case, just
1031 * do RTLD_GLOBAL-style add, so no further messing around needs to
1032 * happen in order that symbols in the loaded .so are findable --
1033 * lookupSymbol() will subsequently see them by dlsym on the program's
1034 * dl-handle. Returns NULL if success, otherwise ptr to an err msg.
1036 * In the PEi386 case, open the DLLs and put handles to them in a
1037 * linked list. When looking for a symbol, try all handles in the
1038 * list. This means that we need to load even DLLs that are guaranteed
1039 * to be in the ghc.exe image already, just so we can get a handle
1040 * to give to loadSymbol, so that we can find the symbols. For such
1041 * libraries, the LoadLibrary call should be a no-op except for returning
1046 #if defined(OBJFORMAT_PEi386)
1047 /* A record for storing handles into DLLs. */
1052 struct _OpenedDLL* next;
1057 /* A list thereof. */
1058 static OpenedDLL* opened_dlls = NULL;
1062 addDLL( char *dll_name )
1064 # if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
1065 /* ------------------- ELF DLL loader ------------------- */
1071 // omitted: RTLD_NOW
1072 // see http://www.haskell.org/pipermail/cvs-ghc/2007-September/038570.html
1073 hdl= dlopen(dll_name, RTLD_LAZY | RTLD_GLOBAL);
1076 /* dlopen failed; return a ptr to the error msg. */
1078 if (errmsg == NULL) errmsg = "addDLL: unknown error";
1085 # elif defined(OBJFORMAT_PEi386)
1086 /* ------------------- Win32 DLL loader ------------------- */
1094 /* debugBelch("\naddDLL; dll_name = `%s'\n", dll_name); */
1096 /* See if we've already got it, and ignore if so. */
1097 for (o_dll = opened_dlls; o_dll != NULL; o_dll = o_dll->next) {
1098 if (0 == strcmp(o_dll->name, dll_name))
1102 /* The file name has no suffix (yet) so that we can try
1103 both foo.dll and foo.drv
1105 The documentation for LoadLibrary says:
1106 If no file name extension is specified in the lpFileName
1107 parameter, the default library extension .dll is
1108 appended. However, the file name string can include a trailing
1109 point character (.) to indicate that the module name has no
1112 buf = stgMallocBytes(strlen(dll_name) + 10, "addDLL");
1113 sprintf(buf, "%s.DLL", dll_name);
1114 instance = LoadLibrary(buf);
1115 if (instance == NULL) {
1116 if (GetLastError() != ERROR_MOD_NOT_FOUND) goto error;
1117 // KAA: allow loading of drivers (like winspool.drv)
1118 sprintf(buf, "%s.DRV", dll_name);
1119 instance = LoadLibrary(buf);
1120 if (instance == NULL) {
1121 if (GetLastError() != ERROR_MOD_NOT_FOUND) goto error;
1122 // #1883: allow loading of unix-style libfoo.dll DLLs
1123 sprintf(buf, "lib%s.DLL", dll_name);
1124 instance = LoadLibrary(buf);
1125 if (instance == NULL) {
1132 /* Add this DLL to the list of DLLs in which to search for symbols. */
1133 o_dll = stgMallocBytes( sizeof(OpenedDLL), "addDLL" );
1134 o_dll->name = stgMallocBytes(1+strlen(dll_name), "addDLL");
1135 strcpy(o_dll->name, dll_name);
1136 o_dll->instance = instance;
1137 o_dll->next = opened_dlls;
1138 opened_dlls = o_dll;
1144 sysErrorBelch(dll_name);
1146 /* LoadLibrary failed; return a ptr to the error msg. */
1147 return "addDLL: could not load DLL";
1150 barf("addDLL: not implemented on this platform");
1154 /* -----------------------------------------------------------------------------
1155 * insert a stable symbol in the hash table
1159 insertStableSymbol(char* obj_name, char* key, StgPtr p)
1161 ghciInsertStrHashTable(obj_name, stablehash, key, getStablePtr(p));
1165 /* -----------------------------------------------------------------------------
1166 * insert a symbol in the hash table
1169 insertSymbol(char* obj_name, char* key, void* data)
1171 ghciInsertStrHashTable(obj_name, symhash, key, data);
1174 /* -----------------------------------------------------------------------------
1175 * lookup a symbol in the hash table
1178 lookupSymbol( char *lbl )
1182 ASSERT(symhash != NULL);
1183 val = lookupStrHashTable(symhash, lbl);
1186 # if defined(OBJFORMAT_ELF)
1187 return dlsym(dl_prog_handle, lbl);
1188 # elif defined(OBJFORMAT_MACHO)
1190 /* On OS X 10.3 and later, we use dlsym instead of the old legacy
1193 HACK: On OS X, global symbols are prefixed with an underscore.
1194 However, dlsym wants us to omit the leading underscore from the
1195 symbol name. For now, we simply strip it off here (and ONLY
1198 ASSERT(lbl[0] == '_');
1199 return dlsym(dl_prog_handle, lbl+1);
1201 if(NSIsSymbolNameDefined(lbl)) {
1202 NSSymbol symbol = NSLookupAndBindSymbol(lbl);
1203 return NSAddressOfSymbol(symbol);
1207 # endif /* HAVE_DLFCN_H */
1208 # elif defined(OBJFORMAT_PEi386)
1211 sym = lookupSymbolInDLLs(lbl);
1212 if (sym != NULL) { return sym; };
1214 // Also try looking up the symbol without the @N suffix. Some
1215 // DLLs have the suffixes on their symbols, some don't.
1216 zapTrailingAtSign ( lbl );
1217 sym = lookupSymbolInDLLs(lbl);
1218 if (sym != NULL) { return sym; };
1230 /* -----------------------------------------------------------------------------
1231 * Debugging aid: look in GHCi's object symbol tables for symbols
1232 * within DELTA bytes of the specified address, and show their names.
1235 void ghci_enquire ( char* addr );
1237 void ghci_enquire ( char* addr )
1242 const int DELTA = 64;
1247 for (oc = objects; oc; oc = oc->next) {
1248 for (i = 0; i < oc->n_symbols; i++) {
1249 sym = oc->symbols[i];
1250 if (sym == NULL) continue;
1253 a = lookupStrHashTable(symhash, sym);
1256 // debugBelch("ghci_enquire: can't find %s\n", sym);
1258 else if (addr-DELTA <= a && a <= addr+DELTA) {
1259 debugBelch("%p + %3d == `%s'\n", addr, (int)(a - addr), sym);
1266 #ifdef ia64_HOST_ARCH
1267 static unsigned int PLTSize(void);
1271 #define ROUND_UP(x,size) ((x + size - 1) & ~(size - 1))
1274 mmapForLinker (size_t bytes, nat flags, int fd)
1276 void *map_addr = NULL;
1279 static nat fixed = 0;
1281 pagesize = getpagesize();
1282 size = ROUND_UP(bytes, pagesize);
1284 #if defined(x86_64_HOST_ARCH)
1287 if (mmap_32bit_base != 0) {
1288 map_addr = mmap_32bit_base;
1292 result = mmap(map_addr, size, PROT_EXEC|PROT_READ|PROT_WRITE,
1293 MAP_PRIVATE|TRY_MAP_32BIT|fixed|flags, fd, 0);
1295 if (result == MAP_FAILED) {
1296 sysErrorBelch("mmap %lu bytes at %p",(lnat)size,map_addr);
1297 errorBelch("Try specifying an address with +RTS -xm<addr> -RTS");
1298 stg_exit(EXIT_FAILURE);
1301 #if defined(x86_64_HOST_ARCH)
1302 if (mmap_32bit_base != 0) {
1303 if (result == map_addr) {
1304 mmap_32bit_base = map_addr + size;
1306 if ((W_)result > 0x80000000) {
1307 // oops, we were given memory over 2Gb
1308 #if defined(freebsd_HOST_OS)
1309 // Some platforms require MAP_FIXED. This is normally
1310 // a bad idea, because MAP_FIXED will overwrite
1311 // existing mappings.
1312 munmap(result,size);
1316 barf("loadObj: failed to mmap() memory below 2Gb; asked for %lu bytes at %p. Try specifying an address with +RTS -xm<addr> -RTS", size, map_addr, result);
1319 // hmm, we were given memory somewhere else, but it's
1320 // still under 2Gb so we can use it. Next time, ask
1321 // for memory right after the place we just got some
1322 mmap_32bit_base = (void*)result + size;
1326 if ((W_)result > 0x80000000) {
1327 // oops, we were given memory over 2Gb
1328 // ... try allocating memory somewhere else?;
1329 debugTrace(DEBUG_linker,"MAP_32BIT didn't work; gave us %lu bytes at 0x%p", bytes, result);
1330 munmap(result, size);
1332 // Set a base address and try again... (guess: 1Gb)
1333 mmap_32bit_base = (void*)0x40000000;
1343 /* -----------------------------------------------------------------------------
1344 * Load an obj (populate the global symbol table, but don't resolve yet)
1346 * Returns: 1 if ok, 0 on error.
1349 loadObj( char *path )
1361 /* debugBelch("loadObj %s\n", path ); */
1363 /* Check that we haven't already loaded this object.
1364 Ignore requests to load multiple times */
1368 for (o = objects; o; o = o->next) {
1369 if (0 == strcmp(o->fileName, path)) {
1371 break; /* don't need to search further */
1375 IF_DEBUG(linker, debugBelch(
1376 "GHCi runtime linker: warning: looks like you're trying to load the\n"
1377 "same object file twice:\n"
1379 "GHCi will ignore this, but be warned.\n"
1381 return 1; /* success */
1385 oc = stgMallocBytes(sizeof(ObjectCode), "loadObj(oc)");
1387 # if defined(OBJFORMAT_ELF)
1388 oc->formatName = "ELF";
1389 # elif defined(OBJFORMAT_PEi386)
1390 oc->formatName = "PEi386";
1391 # elif defined(OBJFORMAT_MACHO)
1392 oc->formatName = "Mach-O";
1395 barf("loadObj: not implemented on this platform");
1398 r = stat(path, &st);
1399 if (r == -1) { return 0; }
1401 /* sigh, strdup() isn't a POSIX function, so do it the long way */
1402 oc->fileName = stgMallocBytes( strlen(path)+1, "loadObj" );
1403 strcpy(oc->fileName, path);
1405 oc->fileSize = st.st_size;
1407 oc->sections = NULL;
1408 oc->proddables = NULL;
1410 /* chain it onto the list of objects */
1415 /* On many architectures malloc'd memory isn't executable, so we need to use mmap. */
1417 #if defined(openbsd_HOST_OS)
1418 fd = open(path, O_RDONLY, S_IRUSR);
1420 fd = open(path, O_RDONLY);
1423 barf("loadObj: can't open `%s'", path);
1425 #ifdef ia64_HOST_ARCH
1426 /* The PLT needs to be right before the object */
1429 pagesize = getpagesize();
1430 n = ROUND_UP(PLTSize(), pagesize);
1431 oc->plt = mmap(NULL, n, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
1432 if (oc->plt == MAP_FAILED)
1433 barf("loadObj: can't allocate PLT");
1436 map_addr = oc->plt + n;
1438 n = ROUND_UP(oc->fileSize, pagesize);
1439 oc->image = mmap(map_addr, n, PROT_EXEC|PROT_READ|PROT_WRITE,
1440 MAP_PRIVATE|TRY_MAP_32BIT, fd, 0);
1441 if (oc->image == MAP_FAILED)
1442 barf("loadObj: can't map `%s'", path);
1445 oc->image = mmapForLinker(oc->fileSize, 0, fd);
1450 #else /* !USE_MMAP */
1451 /* load the image into memory */
1452 f = fopen(path, "rb");
1454 barf("loadObj: can't read `%s'", path);
1456 # if defined(mingw32_HOST_OS)
1457 // TODO: We would like to use allocateExec here, but allocateExec
1458 // cannot currently allocate blocks large enough.
1459 oc->image = VirtualAlloc(NULL, oc->fileSize, MEM_RESERVE | MEM_COMMIT,
1460 PAGE_EXECUTE_READWRITE);
1461 # elif defined(darwin_HOST_OS)
1462 // In a Mach-O .o file, all sections can and will be misaligned
1463 // if the total size of the headers is not a multiple of the
1464 // desired alignment. This is fine for .o files that only serve
1465 // as input for the static linker, but it's not fine for us,
1466 // as SSE (used by gcc for floating point) and Altivec require
1467 // 16-byte alignment.
1468 // We calculate the correct alignment from the header before
1469 // reading the file, and then we misalign oc->image on purpose so
1470 // that the actual sections end up aligned again.
1471 oc->misalignment = machoGetMisalignment(f);
1472 oc->image = stgMallocBytes(oc->fileSize + oc->misalignment, "loadObj(image)");
1473 oc->image += oc->misalignment;
1475 oc->image = stgMallocBytes(oc->fileSize, "loadObj(image)");
1480 n = fread ( oc->image, 1, oc->fileSize, f );
1481 if (n != oc->fileSize)
1482 barf("loadObj: error whilst reading `%s'", path);
1485 #endif /* USE_MMAP */
1487 # if defined(OBJFORMAT_MACHO) && (defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH))
1488 r = ocAllocateSymbolExtras_MachO ( oc );
1489 if (!r) { return r; }
1490 # elif defined(OBJFORMAT_ELF) && (defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH))
1491 r = ocAllocateSymbolExtras_ELF ( oc );
1492 if (!r) { return r; }
1495 /* verify the in-memory image */
1496 # if defined(OBJFORMAT_ELF)
1497 r = ocVerifyImage_ELF ( oc );
1498 # elif defined(OBJFORMAT_PEi386)
1499 r = ocVerifyImage_PEi386 ( oc );
1500 # elif defined(OBJFORMAT_MACHO)
1501 r = ocVerifyImage_MachO ( oc );
1503 barf("loadObj: no verify method");
1505 if (!r) { return r; }
1507 /* build the symbol list for this image */
1508 # if defined(OBJFORMAT_ELF)
1509 r = ocGetNames_ELF ( oc );
1510 # elif defined(OBJFORMAT_PEi386)
1511 r = ocGetNames_PEi386 ( oc );
1512 # elif defined(OBJFORMAT_MACHO)
1513 r = ocGetNames_MachO ( oc );
1515 barf("loadObj: no getNames method");
1517 if (!r) { return r; }
1519 /* loaded, but not resolved yet */
1520 oc->status = OBJECT_LOADED;
1525 /* -----------------------------------------------------------------------------
1526 * resolve all the currently unlinked objects in memory
1528 * Returns: 1 if ok, 0 on error.
1538 for (oc = objects; oc; oc = oc->next) {
1539 if (oc->status != OBJECT_RESOLVED) {
1540 # if defined(OBJFORMAT_ELF)
1541 r = ocResolve_ELF ( oc );
1542 # elif defined(OBJFORMAT_PEi386)
1543 r = ocResolve_PEi386 ( oc );
1544 # elif defined(OBJFORMAT_MACHO)
1545 r = ocResolve_MachO ( oc );
1547 barf("resolveObjs: not implemented on this platform");
1549 if (!r) { return r; }
1550 oc->status = OBJECT_RESOLVED;
1556 /* -----------------------------------------------------------------------------
1557 * delete an object from the pool
1560 unloadObj( char *path )
1562 ObjectCode *oc, *prev;
1564 ASSERT(symhash != NULL);
1565 ASSERT(objects != NULL);
1570 for (oc = objects; oc; prev = oc, oc = oc->next) {
1571 if (!strcmp(oc->fileName,path)) {
1573 /* Remove all the mappings for the symbols within this
1578 for (i = 0; i < oc->n_symbols; i++) {
1579 if (oc->symbols[i] != NULL) {
1580 removeStrHashTable(symhash, oc->symbols[i], NULL);
1588 prev->next = oc->next;
1591 // We're going to leave this in place, in case there are
1592 // any pointers from the heap into it:
1593 // #ifdef mingw32_HOST_OS
1594 // VirtualFree(oc->image);
1596 // stgFree(oc->image);
1598 stgFree(oc->fileName);
1599 stgFree(oc->symbols);
1600 stgFree(oc->sections);
1606 errorBelch("unloadObj: can't find `%s' to unload", path);
1610 /* -----------------------------------------------------------------------------
1611 * Sanity checking. For each ObjectCode, maintain a list of address ranges
1612 * which may be prodded during relocation, and abort if we try and write
1613 * outside any of these.
1615 static void addProddableBlock ( ObjectCode* oc, void* start, int size )
1618 = stgMallocBytes(sizeof(ProddableBlock), "addProddableBlock");
1619 /* debugBelch("aPB %p %p %d\n", oc, start, size); */
1623 pb->next = oc->proddables;
1624 oc->proddables = pb;
1627 static void checkProddableBlock ( ObjectCode* oc, void* addr )
1630 for (pb = oc->proddables; pb != NULL; pb = pb->next) {
1631 char* s = (char*)(pb->start);
1632 char* e = s + pb->size - 1;
1633 char* a = (char*)addr;
1634 /* Assumes that the biggest fixup involves a 4-byte write. This
1635 probably needs to be changed to 8 (ie, +7) on 64-bit
1637 if (a >= s && (a+3) <= e) return;
1639 barf("checkProddableBlock: invalid fixup in runtime linker");
1642 /* -----------------------------------------------------------------------------
1643 * Section management.
1645 static void addSection ( ObjectCode* oc, SectionKind kind,
1646 void* start, void* end )
1648 Section* s = stgMallocBytes(sizeof(Section), "addSection");
1652 s->next = oc->sections;
1655 debugBelch("addSection: %p-%p (size %d), kind %d\n",
1656 start, ((char*)end)-1, end - start + 1, kind );
1661 /* --------------------------------------------------------------------------
1663 * This is about allocating a small chunk of memory for every symbol in the
1664 * object file. We make sure that the SymboLExtras are always "in range" of
1665 * limited-range PC-relative instructions on various platforms by allocating
1666 * them right next to the object code itself.
1669 #if defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH)
1672 ocAllocateSymbolExtras
1674 Allocate additional space at the end of the object file image to make room
1675 for jump islands (powerpc, x86_64) and GOT entries (x86_64).
1677 PowerPC relative branch instructions have a 24 bit displacement field.
1678 As PPC code is always 4-byte-aligned, this yields a +-32MB range.
1679 If a particular imported symbol is outside this range, we have to redirect
1680 the jump to a short piece of new code that just loads the 32bit absolute
1681 address and jumps there.
1682 On x86_64, PC-relative jumps and PC-relative accesses to the GOT are limited
1685 This function just allocates space for one SymbolExtra for every
1686 undefined symbol in the object file. The code for the jump islands is
1687 filled in by makeSymbolExtra below.
1690 static int ocAllocateSymbolExtras( ObjectCode* oc, int count, int first )
1697 int misalignment = 0;
1698 #ifdef darwin_HOST_OS
1699 misalignment = oc->misalignment;
1705 // round up to the nearest 4
1706 aligned = (oc->fileSize + 3) & ~3;
1709 pagesize = getpagesize();
1710 n = ROUND_UP( oc->fileSize, pagesize );
1711 m = ROUND_UP( aligned + sizeof (SymbolExtra) * count, pagesize );
1713 /* we try to use spare space at the end of the last page of the
1714 * image for the jump islands, but if there isn't enough space
1715 * then we have to map some (anonymously, remembering MAP_32BIT).
1717 if( m > n ) // we need to allocate more pages
1719 oc->symbol_extras = mmapForLinker(sizeof(SymbolExtra) * count,
1724 oc->symbol_extras = (SymbolExtra *) (oc->image + aligned);
1727 oc->image -= misalignment;
1728 oc->image = stgReallocBytes( oc->image,
1730 aligned + sizeof (SymbolExtra) * count,
1731 "ocAllocateSymbolExtras" );
1732 oc->image += misalignment;
1734 oc->symbol_extras = (SymbolExtra *) (oc->image + aligned);
1735 #endif /* USE_MMAP */
1737 memset( oc->symbol_extras, 0, sizeof (SymbolExtra) * count );
1740 oc->symbol_extras = NULL;
1742 oc->first_symbol_extra = first;
1743 oc->n_symbol_extras = count;
1748 static SymbolExtra* makeSymbolExtra( ObjectCode* oc,
1749 unsigned long symbolNumber,
1750 unsigned long target )
1754 ASSERT( symbolNumber >= oc->first_symbol_extra
1755 && symbolNumber - oc->first_symbol_extra < oc->n_symbol_extras);
1757 extra = &oc->symbol_extras[symbolNumber - oc->first_symbol_extra];
1759 #ifdef powerpc_HOST_ARCH
1760 // lis r12, hi16(target)
1761 extra->jumpIsland.lis_r12 = 0x3d80;
1762 extra->jumpIsland.hi_addr = target >> 16;
1764 // ori r12, r12, lo16(target)
1765 extra->jumpIsland.ori_r12_r12 = 0x618c;
1766 extra->jumpIsland.lo_addr = target & 0xffff;
1769 extra->jumpIsland.mtctr_r12 = 0x7d8903a6;
1772 extra->jumpIsland.bctr = 0x4e800420;
1774 #ifdef x86_64_HOST_ARCH
1776 static uint8_t jmp[] = { 0xFF, 0x25, 0xF2, 0xFF, 0xFF, 0xFF };
1777 extra->addr = target;
1778 memcpy(extra->jumpIsland, jmp, 6);
1786 /* --------------------------------------------------------------------------
1787 * PowerPC specifics (instruction cache flushing)
1788 * ------------------------------------------------------------------------*/
1790 #ifdef powerpc_TARGET_ARCH
1792 ocFlushInstructionCache
1794 Flush the data & instruction caches.
1795 Because the PPC has split data/instruction caches, we have to
1796 do that whenever we modify code at runtime.
1799 static void ocFlushInstructionCache( ObjectCode *oc )
1801 int n = (oc->fileSize + sizeof( SymbolExtra ) * oc->n_symbol_extras + 3) / 4;
1802 unsigned long *p = (unsigned long *) oc->image;
1806 __asm__ volatile ( "dcbf 0,%0\n\t"
1814 __asm__ volatile ( "sync\n\t"
1820 /* --------------------------------------------------------------------------
1821 * PEi386 specifics (Win32 targets)
1822 * ------------------------------------------------------------------------*/
1824 /* The information for this linker comes from
1825 Microsoft Portable Executable
1826 and Common Object File Format Specification
1827 revision 5.1 January 1998
1828 which SimonM says comes from the MS Developer Network CDs.
1830 It can be found there (on older CDs), but can also be found
1833 http://www.microsoft.com/hwdev/hardware/PECOFF.asp
1835 (this is Rev 6.0 from February 1999).
1837 Things move, so if that fails, try searching for it via
1839 http://www.google.com/search?q=PE+COFF+specification
1841 The ultimate reference for the PE format is the Winnt.h
1842 header file that comes with the Platform SDKs; as always,
1843 implementations will drift wrt their documentation.
1845 A good background article on the PE format is Matt Pietrek's
1846 March 1994 article in Microsoft System Journal (MSJ)
1847 (Vol.9, No. 3): "Peering Inside the PE: A Tour of the
1848 Win32 Portable Executable File Format." The info in there
1849 has recently been updated in a two part article in
1850 MSDN magazine, issues Feb and March 2002,
1851 "Inside Windows: An In-Depth Look into the Win32 Portable
1852 Executable File Format"
1854 John Levine's book "Linkers and Loaders" contains useful
1859 #if defined(OBJFORMAT_PEi386)
1863 typedef unsigned char UChar;
1864 typedef unsigned short UInt16;
1865 typedef unsigned int UInt32;
1872 UInt16 NumberOfSections;
1873 UInt32 TimeDateStamp;
1874 UInt32 PointerToSymbolTable;
1875 UInt32 NumberOfSymbols;
1876 UInt16 SizeOfOptionalHeader;
1877 UInt16 Characteristics;
1881 #define sizeof_COFF_header 20
1888 UInt32 VirtualAddress;
1889 UInt32 SizeOfRawData;
1890 UInt32 PointerToRawData;
1891 UInt32 PointerToRelocations;
1892 UInt32 PointerToLinenumbers;
1893 UInt16 NumberOfRelocations;
1894 UInt16 NumberOfLineNumbers;
1895 UInt32 Characteristics;
1899 #define sizeof_COFF_section 40
1906 UInt16 SectionNumber;
1909 UChar NumberOfAuxSymbols;
1913 #define sizeof_COFF_symbol 18
1918 UInt32 VirtualAddress;
1919 UInt32 SymbolTableIndex;
1924 #define sizeof_COFF_reloc 10
1927 /* From PE spec doc, section 3.3.2 */
1928 /* Note use of MYIMAGE_* since IMAGE_* are already defined in
1929 windows.h -- for the same purpose, but I want to know what I'm
1931 #define MYIMAGE_FILE_RELOCS_STRIPPED 0x0001
1932 #define MYIMAGE_FILE_EXECUTABLE_IMAGE 0x0002
1933 #define MYIMAGE_FILE_DLL 0x2000
1934 #define MYIMAGE_FILE_SYSTEM 0x1000
1935 #define MYIMAGE_FILE_BYTES_REVERSED_HI 0x8000
1936 #define MYIMAGE_FILE_BYTES_REVERSED_LO 0x0080
1937 #define MYIMAGE_FILE_32BIT_MACHINE 0x0100
1939 /* From PE spec doc, section 5.4.2 and 5.4.4 */
1940 #define MYIMAGE_SYM_CLASS_EXTERNAL 2
1941 #define MYIMAGE_SYM_CLASS_STATIC 3
1942 #define MYIMAGE_SYM_UNDEFINED 0
1944 /* From PE spec doc, section 4.1 */
1945 #define MYIMAGE_SCN_CNT_CODE 0x00000020
1946 #define MYIMAGE_SCN_CNT_INITIALIZED_DATA 0x00000040
1947 #define MYIMAGE_SCN_LNK_NRELOC_OVFL 0x01000000
1949 /* From PE spec doc, section 5.2.1 */
1950 #define MYIMAGE_REL_I386_DIR32 0x0006
1951 #define MYIMAGE_REL_I386_REL32 0x0014
1954 /* We use myindex to calculate array addresses, rather than
1955 simply doing the normal subscript thing. That's because
1956 some of the above structs have sizes which are not
1957 a whole number of words. GCC rounds their sizes up to a
1958 whole number of words, which means that the address calcs
1959 arising from using normal C indexing or pointer arithmetic
1960 are just plain wrong. Sigh.
1963 myindex ( int scale, void* base, int index )
1966 ((UChar*)base) + scale * index;
1971 printName ( UChar* name, UChar* strtab )
1973 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
1974 UInt32 strtab_offset = * (UInt32*)(name+4);
1975 debugBelch("%s", strtab + strtab_offset );
1978 for (i = 0; i < 8; i++) {
1979 if (name[i] == 0) break;
1980 debugBelch("%c", name[i] );
1987 copyName ( UChar* name, UChar* strtab, UChar* dst, int dstSize )
1989 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
1990 UInt32 strtab_offset = * (UInt32*)(name+4);
1991 strncpy ( dst, strtab+strtab_offset, dstSize );
1997 if (name[i] == 0) break;
2007 cstring_from_COFF_symbol_name ( UChar* name, UChar* strtab )
2010 /* If the string is longer than 8 bytes, look in the
2011 string table for it -- this will be correctly zero terminated.
2013 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
2014 UInt32 strtab_offset = * (UInt32*)(name+4);
2015 return ((UChar*)strtab) + strtab_offset;
2017 /* Otherwise, if shorter than 8 bytes, return the original,
2018 which by defn is correctly terminated.
2020 if (name[7]==0) return name;
2021 /* The annoying case: 8 bytes. Copy into a temporary
2022 (which is never freed ...)
2024 newstr = stgMallocBytes(9, "cstring_from_COFF_symbol_name");
2026 strncpy(newstr,name,8);
2032 /* Just compares the short names (first 8 chars) */
2033 static COFF_section *
2034 findPEi386SectionCalled ( ObjectCode* oc, char* name )
2038 = (COFF_header*)(oc->image);
2039 COFF_section* sectab
2041 ((UChar*)(oc->image))
2042 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2044 for (i = 0; i < hdr->NumberOfSections; i++) {
2047 COFF_section* section_i
2049 myindex ( sizeof_COFF_section, sectab, i );
2050 n1 = (UChar*) &(section_i->Name);
2052 if (n1[0]==n2[0] && n1[1]==n2[1] && n1[2]==n2[2] &&
2053 n1[3]==n2[3] && n1[4]==n2[4] && n1[5]==n2[5] &&
2054 n1[6]==n2[6] && n1[7]==n2[7])
2063 zapTrailingAtSign ( UChar* sym )
2065 # define my_isdigit(c) ((c) >= '0' && (c) <= '9')
2067 if (sym[0] == 0) return;
2069 while (sym[i] != 0) i++;
2072 while (j > 0 && my_isdigit(sym[j])) j--;
2073 if (j > 0 && sym[j] == '@' && j != i) sym[j] = 0;
2078 lookupSymbolInDLLs ( UChar *lbl )
2083 for (o_dll = opened_dlls; o_dll != NULL; o_dll = o_dll->next) {
2084 /* debugBelch("look in %s for %s\n", o_dll->name, lbl); */
2086 if (lbl[0] == '_') {
2087 /* HACK: if the name has an initial underscore, try stripping
2088 it off & look that up first. I've yet to verify whether there's
2089 a Rule that governs whether an initial '_' *should always* be
2090 stripped off when mapping from import lib name to the DLL name.
2092 sym = GetProcAddress(o_dll->instance, (lbl+1));
2094 /*debugBelch("found %s in %s\n", lbl+1,o_dll->name);*/
2098 sym = GetProcAddress(o_dll->instance, lbl);
2100 /*debugBelch("found %s in %s\n", lbl,o_dll->name);*/
2109 ocVerifyImage_PEi386 ( ObjectCode* oc )
2114 COFF_section* sectab;
2115 COFF_symbol* symtab;
2117 /* debugBelch("\nLOADING %s\n", oc->fileName); */
2118 hdr = (COFF_header*)(oc->image);
2119 sectab = (COFF_section*) (
2120 ((UChar*)(oc->image))
2121 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2123 symtab = (COFF_symbol*) (
2124 ((UChar*)(oc->image))
2125 + hdr->PointerToSymbolTable
2127 strtab = ((UChar*)symtab)
2128 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
2130 if (hdr->Machine != 0x14c) {
2131 errorBelch("%s: Not x86 PEi386", oc->fileName);
2134 if (hdr->SizeOfOptionalHeader != 0) {
2135 errorBelch("%s: PEi386 with nonempty optional header", oc->fileName);
2138 if ( /* (hdr->Characteristics & MYIMAGE_FILE_RELOCS_STRIPPED) || */
2139 (hdr->Characteristics & MYIMAGE_FILE_EXECUTABLE_IMAGE) ||
2140 (hdr->Characteristics & MYIMAGE_FILE_DLL) ||
2141 (hdr->Characteristics & MYIMAGE_FILE_SYSTEM) ) {
2142 errorBelch("%s: Not a PEi386 object file", oc->fileName);
2145 if ( (hdr->Characteristics & MYIMAGE_FILE_BYTES_REVERSED_HI)
2146 /* || !(hdr->Characteristics & MYIMAGE_FILE_32BIT_MACHINE) */ ) {
2147 errorBelch("%s: Invalid PEi386 word size or endiannness: %d",
2149 (int)(hdr->Characteristics));
2152 /* If the string table size is way crazy, this might indicate that
2153 there are more than 64k relocations, despite claims to the
2154 contrary. Hence this test. */
2155 /* debugBelch("strtab size %d\n", * (UInt32*)strtab); */
2157 if ( (*(UInt32*)strtab) > 600000 ) {
2158 /* Note that 600k has no special significance other than being
2159 big enough to handle the almost-2MB-sized lumps that
2160 constitute HSwin32*.o. */
2161 debugBelch("PEi386 object has suspiciously large string table; > 64k relocs?");
2166 /* No further verification after this point; only debug printing. */
2168 IF_DEBUG(linker, i=1);
2169 if (i == 0) return 1;
2171 debugBelch( "sectab offset = %d\n", ((UChar*)sectab) - ((UChar*)hdr) );
2172 debugBelch( "symtab offset = %d\n", ((UChar*)symtab) - ((UChar*)hdr) );
2173 debugBelch( "strtab offset = %d\n", ((UChar*)strtab) - ((UChar*)hdr) );
2176 debugBelch( "Machine: 0x%x\n", (UInt32)(hdr->Machine) );
2177 debugBelch( "# sections: %d\n", (UInt32)(hdr->NumberOfSections) );
2178 debugBelch( "time/date: 0x%x\n", (UInt32)(hdr->TimeDateStamp) );
2179 debugBelch( "symtab offset: %d\n", (UInt32)(hdr->PointerToSymbolTable) );
2180 debugBelch( "# symbols: %d\n", (UInt32)(hdr->NumberOfSymbols) );
2181 debugBelch( "sz of opt hdr: %d\n", (UInt32)(hdr->SizeOfOptionalHeader) );
2182 debugBelch( "characteristics: 0x%x\n", (UInt32)(hdr->Characteristics) );
2184 /* Print the section table. */
2186 for (i = 0; i < hdr->NumberOfSections; i++) {
2188 COFF_section* sectab_i
2190 myindex ( sizeof_COFF_section, sectab, i );
2197 printName ( sectab_i->Name, strtab );
2207 sectab_i->VirtualSize,
2208 sectab_i->VirtualAddress,
2209 sectab_i->SizeOfRawData,
2210 sectab_i->PointerToRawData,
2211 sectab_i->NumberOfRelocations,
2212 sectab_i->PointerToRelocations,
2213 sectab_i->PointerToRawData
2215 reltab = (COFF_reloc*) (
2216 ((UChar*)(oc->image)) + sectab_i->PointerToRelocations
2219 if ( sectab_i->Characteristics & MYIMAGE_SCN_LNK_NRELOC_OVFL ) {
2220 /* If the relocation field (a short) has overflowed, the
2221 * real count can be found in the first reloc entry.
2223 * See Section 4.1 (last para) of the PE spec (rev6.0).
2225 COFF_reloc* rel = (COFF_reloc*)
2226 myindex ( sizeof_COFF_reloc, reltab, 0 );
2227 noRelocs = rel->VirtualAddress;
2230 noRelocs = sectab_i->NumberOfRelocations;
2234 for (; j < noRelocs; j++) {
2236 COFF_reloc* rel = (COFF_reloc*)
2237 myindex ( sizeof_COFF_reloc, reltab, j );
2239 " type 0x%-4x vaddr 0x%-8x name `",
2241 rel->VirtualAddress );
2242 sym = (COFF_symbol*)
2243 myindex ( sizeof_COFF_symbol, symtab, rel->SymbolTableIndex );
2244 /* Hmm..mysterious looking offset - what's it for? SOF */
2245 printName ( sym->Name, strtab -10 );
2252 debugBelch("string table has size 0x%x\n", * (UInt32*)strtab );
2253 debugBelch("---START of string table---\n");
2254 for (i = 4; i < *(Int32*)strtab; i++) {
2256 debugBelch("\n"); else
2257 debugBelch("%c", strtab[i] );
2259 debugBelch("--- END of string table---\n");
2264 COFF_symbol* symtab_i;
2265 if (i >= (Int32)(hdr->NumberOfSymbols)) break;
2266 symtab_i = (COFF_symbol*)
2267 myindex ( sizeof_COFF_symbol, symtab, i );
2273 printName ( symtab_i->Name, strtab );
2282 (Int32)(symtab_i->SectionNumber),
2283 (UInt32)symtab_i->Type,
2284 (UInt32)symtab_i->StorageClass,
2285 (UInt32)symtab_i->NumberOfAuxSymbols
2287 i += symtab_i->NumberOfAuxSymbols;
2297 ocGetNames_PEi386 ( ObjectCode* oc )
2300 COFF_section* sectab;
2301 COFF_symbol* symtab;
2308 hdr = (COFF_header*)(oc->image);
2309 sectab = (COFF_section*) (
2310 ((UChar*)(oc->image))
2311 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2313 symtab = (COFF_symbol*) (
2314 ((UChar*)(oc->image))
2315 + hdr->PointerToSymbolTable
2317 strtab = ((UChar*)(oc->image))
2318 + hdr->PointerToSymbolTable
2319 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
2321 /* Allocate space for any (local, anonymous) .bss sections. */
2323 for (i = 0; i < hdr->NumberOfSections; i++) {
2326 COFF_section* sectab_i
2328 myindex ( sizeof_COFF_section, sectab, i );
2329 if (0 != strcmp(sectab_i->Name, ".bss")) continue;
2330 /* sof 10/05: the PE spec text isn't too clear regarding what
2331 * the SizeOfRawData field is supposed to hold for object
2332 * file sections containing just uninitialized data -- for executables,
2333 * it is supposed to be zero; unclear what it's supposed to be
2334 * for object files. However, VirtualSize is guaranteed to be
2335 * zero for object files, which definitely suggests that SizeOfRawData
2336 * will be non-zero (where else would the size of this .bss section be
2337 * stored?) Looking at the COFF_section info for incoming object files,
2338 * this certainly appears to be the case.
2340 * => I suspect we've been incorrectly handling .bss sections in (relocatable)
2341 * object files up until now. This turned out to bite us with ghc-6.4.1's use
2342 * of gcc-3.4.x, which has started to emit initially-zeroed-out local 'static'
2343 * variable decls into to the .bss section. (The specific function in Q which
2344 * triggered this is libraries/base/cbits/dirUtils.c:__hscore_getFolderPath())
2346 if (sectab_i->VirtualSize == 0 && sectab_i->SizeOfRawData == 0) continue;
2347 /* This is a non-empty .bss section. Allocate zeroed space for
2348 it, and set its PointerToRawData field such that oc->image +
2349 PointerToRawData == addr_of_zeroed_space. */
2350 bss_sz = sectab_i->VirtualSize;
2351 if ( bss_sz < sectab_i->SizeOfRawData) { bss_sz = sectab_i->SizeOfRawData; }
2352 zspace = stgCallocBytes(1, bss_sz, "ocGetNames_PEi386(anonymous bss)");
2353 sectab_i->PointerToRawData = ((UChar*)zspace) - ((UChar*)(oc->image));
2354 addProddableBlock(oc, zspace, bss_sz);
2355 /* debugBelch("BSS anon section at 0x%x\n", zspace); */
2358 /* Copy section information into the ObjectCode. */
2360 for (i = 0; i < hdr->NumberOfSections; i++) {
2366 = SECTIONKIND_OTHER;
2367 COFF_section* sectab_i
2369 myindex ( sizeof_COFF_section, sectab, i );
2370 IF_DEBUG(linker, debugBelch("section name = %s\n", sectab_i->Name ));
2373 /* I'm sure this is the Right Way to do it. However, the
2374 alternative of testing the sectab_i->Name field seems to
2375 work ok with Cygwin.
2377 if (sectab_i->Characteristics & MYIMAGE_SCN_CNT_CODE ||
2378 sectab_i->Characteristics & MYIMAGE_SCN_CNT_INITIALIZED_DATA)
2379 kind = SECTIONKIND_CODE_OR_RODATA;
2382 if (0==strcmp(".text",sectab_i->Name) ||
2383 0==strcmp(".rdata",sectab_i->Name)||
2384 0==strcmp(".rodata",sectab_i->Name))
2385 kind = SECTIONKIND_CODE_OR_RODATA;
2386 if (0==strcmp(".data",sectab_i->Name) ||
2387 0==strcmp(".bss",sectab_i->Name))
2388 kind = SECTIONKIND_RWDATA;
2390 ASSERT(sectab_i->SizeOfRawData == 0 || sectab_i->VirtualSize == 0);
2391 sz = sectab_i->SizeOfRawData;
2392 if (sz < sectab_i->VirtualSize) sz = sectab_i->VirtualSize;
2394 start = ((UChar*)(oc->image)) + sectab_i->PointerToRawData;
2395 end = start + sz - 1;
2397 if (kind == SECTIONKIND_OTHER
2398 /* Ignore sections called which contain stabs debugging
2400 && 0 != strcmp(".stab", sectab_i->Name)
2401 && 0 != strcmp(".stabstr", sectab_i->Name)
2402 /* ignore constructor section for now */
2403 && 0 != strcmp(".ctors", sectab_i->Name)
2404 /* ignore section generated from .ident */
2405 && 0!= strcmp("/4", sectab_i->Name)
2406 /* ignore unknown section that appeared in gcc 3.4.5(?) */
2407 && 0!= strcmp(".reloc", sectab_i->Name)
2409 errorBelch("Unknown PEi386 section name `%s' (while processing: %s)", sectab_i->Name, oc->fileName);
2413 if (kind != SECTIONKIND_OTHER && end >= start) {
2414 addSection(oc, kind, start, end);
2415 addProddableBlock(oc, start, end - start + 1);
2419 /* Copy exported symbols into the ObjectCode. */
2421 oc->n_symbols = hdr->NumberOfSymbols;
2422 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
2423 "ocGetNames_PEi386(oc->symbols)");
2424 /* Call me paranoid; I don't care. */
2425 for (i = 0; i < oc->n_symbols; i++)
2426 oc->symbols[i] = NULL;
2430 COFF_symbol* symtab_i;
2431 if (i >= (Int32)(hdr->NumberOfSymbols)) break;
2432 symtab_i = (COFF_symbol*)
2433 myindex ( sizeof_COFF_symbol, symtab, i );
2437 if (symtab_i->StorageClass == MYIMAGE_SYM_CLASS_EXTERNAL
2438 && symtab_i->SectionNumber != MYIMAGE_SYM_UNDEFINED) {
2439 /* This symbol is global and defined, viz, exported */
2440 /* for MYIMAGE_SYMCLASS_EXTERNAL
2441 && !MYIMAGE_SYM_UNDEFINED,
2442 the address of the symbol is:
2443 address of relevant section + offset in section
2445 COFF_section* sectabent
2446 = (COFF_section*) myindex ( sizeof_COFF_section,
2448 symtab_i->SectionNumber-1 );
2449 addr = ((UChar*)(oc->image))
2450 + (sectabent->PointerToRawData
2454 if (symtab_i->SectionNumber == MYIMAGE_SYM_UNDEFINED
2455 && symtab_i->Value > 0) {
2456 /* This symbol isn't in any section at all, ie, global bss.
2457 Allocate zeroed space for it. */
2458 addr = stgCallocBytes(1, symtab_i->Value,
2459 "ocGetNames_PEi386(non-anonymous bss)");
2460 addSection(oc, SECTIONKIND_RWDATA, addr,
2461 ((UChar*)addr) + symtab_i->Value - 1);
2462 addProddableBlock(oc, addr, symtab_i->Value);
2463 /* debugBelch("BSS section at 0x%x\n", addr); */
2466 if (addr != NULL ) {
2467 sname = cstring_from_COFF_symbol_name ( symtab_i->Name, strtab );
2468 /* debugBelch("addSymbol %p `%s \n", addr,sname); */
2469 IF_DEBUG(linker, debugBelch("addSymbol %p `%s'\n", addr,sname);)
2470 ASSERT(i >= 0 && i < oc->n_symbols);
2471 /* cstring_from_COFF_symbol_name always succeeds. */
2472 oc->symbols[i] = sname;
2473 ghciInsertStrHashTable(oc->fileName, symhash, sname, addr);
2477 "IGNORING symbol %d\n"
2481 printName ( symtab_i->Name, strtab );
2490 (Int32)(symtab_i->SectionNumber),
2491 (UInt32)symtab_i->Type,
2492 (UInt32)symtab_i->StorageClass,
2493 (UInt32)symtab_i->NumberOfAuxSymbols
2498 i += symtab_i->NumberOfAuxSymbols;
2507 ocResolve_PEi386 ( ObjectCode* oc )
2510 COFF_section* sectab;
2511 COFF_symbol* symtab;
2521 /* ToDo: should be variable-sized? But is at least safe in the
2522 sense of buffer-overrun-proof. */
2524 /* debugBelch("resolving for %s\n", oc->fileName); */
2526 hdr = (COFF_header*)(oc->image);
2527 sectab = (COFF_section*) (
2528 ((UChar*)(oc->image))
2529 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2531 symtab = (COFF_symbol*) (
2532 ((UChar*)(oc->image))
2533 + hdr->PointerToSymbolTable
2535 strtab = ((UChar*)(oc->image))
2536 + hdr->PointerToSymbolTable
2537 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
2539 for (i = 0; i < hdr->NumberOfSections; i++) {
2540 COFF_section* sectab_i
2542 myindex ( sizeof_COFF_section, sectab, i );
2545 ((UChar*)(oc->image)) + sectab_i->PointerToRelocations
2548 /* Ignore sections called which contain stabs debugging
2550 if (0 == strcmp(".stab", sectab_i->Name)
2551 || 0 == strcmp(".stabstr", sectab_i->Name)
2552 || 0 == strcmp(".ctors", sectab_i->Name))
2555 if ( sectab_i->Characteristics & MYIMAGE_SCN_LNK_NRELOC_OVFL ) {
2556 /* If the relocation field (a short) has overflowed, the
2557 * real count can be found in the first reloc entry.
2559 * See Section 4.1 (last para) of the PE spec (rev6.0).
2561 * Nov2003 update: the GNU linker still doesn't correctly
2562 * handle the generation of relocatable object files with
2563 * overflown relocations. Hence the output to warn of potential
2566 COFF_reloc* rel = (COFF_reloc*)
2567 myindex ( sizeof_COFF_reloc, reltab, 0 );
2568 noRelocs = rel->VirtualAddress;
2570 /* 10/05: we now assume (and check for) a GNU ld that is capable
2571 * of handling object files with (>2^16) of relocs.
2574 debugBelch("WARNING: Overflown relocation field (# relocs found: %u)\n",
2579 noRelocs = sectab_i->NumberOfRelocations;
2584 for (; j < noRelocs; j++) {
2586 COFF_reloc* reltab_j
2588 myindex ( sizeof_COFF_reloc, reltab, j );
2590 /* the location to patch */
2592 ((UChar*)(oc->image))
2593 + (sectab_i->PointerToRawData
2594 + reltab_j->VirtualAddress
2595 - sectab_i->VirtualAddress )
2597 /* the existing contents of pP */
2599 /* the symbol to connect to */
2600 sym = (COFF_symbol*)
2601 myindex ( sizeof_COFF_symbol,
2602 symtab, reltab_j->SymbolTableIndex );
2605 "reloc sec %2d num %3d: type 0x%-4x "
2606 "vaddr 0x%-8x name `",
2608 (UInt32)reltab_j->Type,
2609 reltab_j->VirtualAddress );
2610 printName ( sym->Name, strtab );
2611 debugBelch("'\n" ));
2613 if (sym->StorageClass == MYIMAGE_SYM_CLASS_STATIC) {
2614 COFF_section* section_sym
2615 = findPEi386SectionCalled ( oc, sym->Name );
2617 errorBelch("%s: can't find section `%s'", oc->fileName, sym->Name);
2620 S = ((UInt32)(oc->image))
2621 + (section_sym->PointerToRawData
2624 copyName ( sym->Name, strtab, symbol, 1000-1 );
2625 S = (UInt32) lookupSymbol( symbol );
2626 if ((void*)S != NULL) goto foundit;
2627 errorBelch("%s: unknown symbol `%s'", oc->fileName, symbol);
2631 checkProddableBlock(oc, pP);
2632 switch (reltab_j->Type) {
2633 case MYIMAGE_REL_I386_DIR32:
2636 case MYIMAGE_REL_I386_REL32:
2637 /* Tricky. We have to insert a displacement at
2638 pP which, when added to the PC for the _next_
2639 insn, gives the address of the target (S).
2640 Problem is to know the address of the next insn
2641 when we only know pP. We assume that this
2642 literal field is always the last in the insn,
2643 so that the address of the next insn is pP+4
2644 -- hence the constant 4.
2645 Also I don't know if A should be added, but so
2646 far it has always been zero.
2648 SOF 05/2005: 'A' (old contents of *pP) have been observed
2649 to contain values other than zero (the 'wx' object file
2650 that came with wxhaskell-0.9.4; dunno how it was compiled..).
2651 So, add displacement to old value instead of asserting
2652 A to be zero. Fixes wxhaskell-related crashes, and no other
2653 ill effects have been observed.
2655 Update: the reason why we're seeing these more elaborate
2656 relocations is due to a switch in how the NCG compiles SRTs
2657 and offsets to them from info tables. SRTs live in .(ro)data,
2658 while info tables live in .text, causing GAS to emit REL32/DISP32
2659 relocations with non-zero values. Adding the displacement is
2660 the right thing to do.
2662 *pP = S - ((UInt32)pP) - 4 + A;
2665 debugBelch("%s: unhandled PEi386 relocation type %d",
2666 oc->fileName, reltab_j->Type);
2673 IF_DEBUG(linker, debugBelch("completed %s", oc->fileName));
2677 #endif /* defined(OBJFORMAT_PEi386) */
2680 /* --------------------------------------------------------------------------
2682 * ------------------------------------------------------------------------*/
2684 #if defined(OBJFORMAT_ELF)
2689 #if defined(sparc_HOST_ARCH)
2690 # define ELF_TARGET_SPARC /* Used inside <elf.h> */
2691 #elif defined(i386_HOST_ARCH)
2692 # define ELF_TARGET_386 /* Used inside <elf.h> */
2693 #elif defined(x86_64_HOST_ARCH)
2694 # define ELF_TARGET_X64_64
2696 #elif defined (ia64_HOST_ARCH)
2697 # define ELF_TARGET_IA64 /* Used inside <elf.h> */
2699 # define ELF_FUNCTION_DESC /* calling convention uses function descriptors */
2700 # define ELF_NEED_GOT /* needs Global Offset Table */
2701 # define ELF_NEED_PLT /* needs Procedure Linkage Tables */
2704 #if !defined(openbsd_HOST_OS)
2707 /* openbsd elf has things in different places, with diff names */
2708 # include <elf_abi.h>
2709 # include <machine/reloc.h>
2710 # define R_386_32 RELOC_32
2711 # define R_386_PC32 RELOC_PC32
2714 /* If elf.h doesn't define it */
2715 # ifndef R_X86_64_PC64
2716 # define R_X86_64_PC64 24
2720 * Define a set of types which can be used for both ELF32 and ELF64
2724 #define ELFCLASS ELFCLASS64
2725 #define Elf_Addr Elf64_Addr
2726 #define Elf_Word Elf64_Word
2727 #define Elf_Sword Elf64_Sword
2728 #define Elf_Ehdr Elf64_Ehdr
2729 #define Elf_Phdr Elf64_Phdr
2730 #define Elf_Shdr Elf64_Shdr
2731 #define Elf_Sym Elf64_Sym
2732 #define Elf_Rel Elf64_Rel
2733 #define Elf_Rela Elf64_Rela
2734 #define ELF_ST_TYPE ELF64_ST_TYPE
2735 #define ELF_ST_BIND ELF64_ST_BIND
2736 #define ELF_R_TYPE ELF64_R_TYPE
2737 #define ELF_R_SYM ELF64_R_SYM
2739 #define ELFCLASS ELFCLASS32
2740 #define Elf_Addr Elf32_Addr
2741 #define Elf_Word Elf32_Word
2742 #define Elf_Sword Elf32_Sword
2743 #define Elf_Ehdr Elf32_Ehdr
2744 #define Elf_Phdr Elf32_Phdr
2745 #define Elf_Shdr Elf32_Shdr
2746 #define Elf_Sym Elf32_Sym
2747 #define Elf_Rel Elf32_Rel
2748 #define Elf_Rela Elf32_Rela
2750 #define ELF_ST_TYPE ELF32_ST_TYPE
2753 #define ELF_ST_BIND ELF32_ST_BIND
2756 #define ELF_R_TYPE ELF32_R_TYPE
2759 #define ELF_R_SYM ELF32_R_SYM
2765 * Functions to allocate entries in dynamic sections. Currently we simply
2766 * preallocate a large number, and we don't check if a entry for the given
2767 * target already exists (a linear search is too slow). Ideally these
2768 * entries would be associated with symbols.
2771 /* These sizes sufficient to load HSbase + HShaskell98 + a few modules */
2772 #define GOT_SIZE 0x20000
2773 #define FUNCTION_TABLE_SIZE 0x10000
2774 #define PLT_SIZE 0x08000
2777 static Elf_Addr got[GOT_SIZE];
2778 static unsigned int gotIndex;
2779 static Elf_Addr gp_val = (Elf_Addr)got;
2782 allocateGOTEntry(Elf_Addr target)
2786 if (gotIndex >= GOT_SIZE)
2787 barf("Global offset table overflow");
2789 entry = &got[gotIndex++];
2791 return (Elf_Addr)entry;
2795 #ifdef ELF_FUNCTION_DESC
2801 static FunctionDesc functionTable[FUNCTION_TABLE_SIZE];
2802 static unsigned int functionTableIndex;
2805 allocateFunctionDesc(Elf_Addr target)
2807 FunctionDesc *entry;
2809 if (functionTableIndex >= FUNCTION_TABLE_SIZE)
2810 barf("Function table overflow");
2812 entry = &functionTable[functionTableIndex++];
2814 entry->gp = (Elf_Addr)gp_val;
2815 return (Elf_Addr)entry;
2819 copyFunctionDesc(Elf_Addr target)
2821 FunctionDesc *olddesc = (FunctionDesc *)target;
2822 FunctionDesc *newdesc;
2824 newdesc = (FunctionDesc *)allocateFunctionDesc(olddesc->ip);
2825 newdesc->gp = olddesc->gp;
2826 return (Elf_Addr)newdesc;
2831 #ifdef ia64_HOST_ARCH
2832 static void ia64_reloc_gprel22(Elf_Addr target, Elf_Addr value);
2833 static void ia64_reloc_pcrel21(Elf_Addr target, Elf_Addr value, ObjectCode *oc);
2835 static unsigned char plt_code[] =
2837 /* taken from binutils bfd/elfxx-ia64.c */
2838 0x0b, 0x78, 0x00, 0x02, 0x00, 0x24, /* [MMI] addl r15=0,r1;; */
2839 0x00, 0x41, 0x3c, 0x30, 0x28, 0xc0, /* ld8 r16=[r15],8 */
2840 0x01, 0x08, 0x00, 0x84, /* mov r14=r1;; */
2841 0x11, 0x08, 0x00, 0x1e, 0x18, 0x10, /* [MIB] ld8 r1=[r15] */
2842 0x60, 0x80, 0x04, 0x80, 0x03, 0x00, /* mov b6=r16 */
2843 0x60, 0x00, 0x80, 0x00 /* br.few b6;; */
2846 /* If we can't get to the function descriptor via gp, take a local copy of it */
2847 #define PLT_RELOC(code, target) { \
2848 Elf64_Sxword rel_value = target - gp_val; \
2849 if ((rel_value > 0x1fffff) || (rel_value < -0x1fffff)) \
2850 ia64_reloc_gprel22((Elf_Addr)code, copyFunctionDesc(target)); \
2852 ia64_reloc_gprel22((Elf_Addr)code, target); \
2857 unsigned char code[sizeof(plt_code)];
2861 allocatePLTEntry(Elf_Addr target, ObjectCode *oc)
2863 PLTEntry *plt = (PLTEntry *)oc->plt;
2866 if (oc->pltIndex >= PLT_SIZE)
2867 barf("Procedure table overflow");
2869 entry = &plt[oc->pltIndex++];
2870 memcpy(entry->code, plt_code, sizeof(entry->code));
2871 PLT_RELOC(entry->code, target);
2872 return (Elf_Addr)entry;
2878 return (PLT_SIZE * sizeof(PLTEntry));
2884 * Generic ELF functions
2888 findElfSection ( void* objImage, Elf_Word sh_type )
2890 char* ehdrC = (char*)objImage;
2891 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2892 Elf_Shdr* shdr = (Elf_Shdr*)(ehdrC + ehdr->e_shoff);
2893 char* sh_strtab = ehdrC + shdr[ehdr->e_shstrndx].sh_offset;
2897 for (i = 0; i < ehdr->e_shnum; i++) {
2898 if (shdr[i].sh_type == sh_type
2899 /* Ignore the section header's string table. */
2900 && i != ehdr->e_shstrndx
2901 /* Ignore string tables named .stabstr, as they contain
2903 && 0 != memcmp(".stabstr", sh_strtab + shdr[i].sh_name, 8)
2905 ptr = ehdrC + shdr[i].sh_offset;
2912 #if defined(ia64_HOST_ARCH)
2914 findElfSegment ( void* objImage, Elf_Addr vaddr )
2916 char* ehdrC = (char*)objImage;
2917 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2918 Elf_Phdr* phdr = (Elf_Phdr*)(ehdrC + ehdr->e_phoff);
2919 Elf_Addr segaddr = 0;
2922 for (i = 0; i < ehdr->e_phnum; i++) {
2923 segaddr = phdr[i].p_vaddr;
2924 if ((vaddr >= segaddr) && (vaddr < segaddr + phdr[i].p_memsz))
2932 ocVerifyImage_ELF ( ObjectCode* oc )
2936 int i, j, nent, nstrtab, nsymtabs;
2940 char* ehdrC = (char*)(oc->image);
2941 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2943 if (ehdr->e_ident[EI_MAG0] != ELFMAG0 ||
2944 ehdr->e_ident[EI_MAG1] != ELFMAG1 ||
2945 ehdr->e_ident[EI_MAG2] != ELFMAG2 ||
2946 ehdr->e_ident[EI_MAG3] != ELFMAG3) {
2947 errorBelch("%s: not an ELF object", oc->fileName);
2951 if (ehdr->e_ident[EI_CLASS] != ELFCLASS) {
2952 errorBelch("%s: unsupported ELF format", oc->fileName);
2956 if (ehdr->e_ident[EI_DATA] == ELFDATA2LSB) {
2957 IF_DEBUG(linker,debugBelch( "Is little-endian\n" ));
2959 if (ehdr->e_ident[EI_DATA] == ELFDATA2MSB) {
2960 IF_DEBUG(linker,debugBelch( "Is big-endian\n" ));
2962 errorBelch("%s: unknown endiannness", oc->fileName);
2966 if (ehdr->e_type != ET_REL) {
2967 errorBelch("%s: not a relocatable object (.o) file", oc->fileName);
2970 IF_DEBUG(linker, debugBelch( "Is a relocatable object (.o) file\n" ));
2972 IF_DEBUG(linker,debugBelch( "Architecture is " ));
2973 switch (ehdr->e_machine) {
2974 case EM_386: IF_DEBUG(linker,debugBelch( "x86" )); break;
2975 #ifdef EM_SPARC32PLUS
2976 case EM_SPARC32PLUS:
2978 case EM_SPARC: IF_DEBUG(linker,debugBelch( "sparc" )); break;
2980 case EM_IA_64: IF_DEBUG(linker,debugBelch( "ia64" )); break;
2982 case EM_PPC: IF_DEBUG(linker,debugBelch( "powerpc32" )); break;
2984 case EM_X86_64: IF_DEBUG(linker,debugBelch( "x86_64" )); break;
2985 #elif defined(EM_AMD64)
2986 case EM_AMD64: IF_DEBUG(linker,debugBelch( "amd64" )); break;
2988 default: IF_DEBUG(linker,debugBelch( "unknown" ));
2989 errorBelch("%s: unknown architecture (e_machine == %d)"
2990 , oc->fileName, ehdr->e_machine);
2994 IF_DEBUG(linker,debugBelch(
2995 "\nSection header table: start %ld, n_entries %d, ent_size %d\n",
2996 (long)ehdr->e_shoff, ehdr->e_shnum, ehdr->e_shentsize ));
2998 ASSERT (ehdr->e_shentsize == sizeof(Elf_Shdr));
3000 shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
3002 if (ehdr->e_shstrndx == SHN_UNDEF) {
3003 errorBelch("%s: no section header string table", oc->fileName);
3006 IF_DEBUG(linker,debugBelch( "Section header string table is section %d\n",
3008 sh_strtab = ehdrC + shdr[ehdr->e_shstrndx].sh_offset;
3011 for (i = 0; i < ehdr->e_shnum; i++) {
3012 IF_DEBUG(linker,debugBelch("%2d: ", i ));
3013 IF_DEBUG(linker,debugBelch("type=%2d ", (int)shdr[i].sh_type ));
3014 IF_DEBUG(linker,debugBelch("size=%4d ", (int)shdr[i].sh_size ));
3015 IF_DEBUG(linker,debugBelch("offs=%4d ", (int)shdr[i].sh_offset ));
3016 IF_DEBUG(linker,debugBelch(" (%p .. %p) ",
3017 ehdrC + shdr[i].sh_offset,
3018 ehdrC + shdr[i].sh_offset + shdr[i].sh_size - 1));
3020 if (shdr[i].sh_type == SHT_REL) {
3021 IF_DEBUG(linker,debugBelch("Rel " ));
3022 } else if (shdr[i].sh_type == SHT_RELA) {
3023 IF_DEBUG(linker,debugBelch("RelA " ));
3025 IF_DEBUG(linker,debugBelch(" "));
3028 IF_DEBUG(linker,debugBelch("sname=%s\n", sh_strtab + shdr[i].sh_name ));
3032 IF_DEBUG(linker,debugBelch( "\nString tables" ));
3035 for (i = 0; i < ehdr->e_shnum; i++) {
3036 if (shdr[i].sh_type == SHT_STRTAB
3037 /* Ignore the section header's string table. */
3038 && i != ehdr->e_shstrndx
3039 /* Ignore string tables named .stabstr, as they contain
3041 && 0 != memcmp(".stabstr", sh_strtab + shdr[i].sh_name, 8)
3043 IF_DEBUG(linker,debugBelch(" section %d is a normal string table", i ));
3044 strtab = ehdrC + shdr[i].sh_offset;
3049 errorBelch("%s: no string tables, or too many", oc->fileName);
3054 IF_DEBUG(linker,debugBelch( "\nSymbol tables" ));
3055 for (i = 0; i < ehdr->e_shnum; i++) {
3056 if (shdr[i].sh_type != SHT_SYMTAB) continue;
3057 IF_DEBUG(linker,debugBelch( "section %d is a symbol table\n", i ));
3059 stab = (Elf_Sym*) (ehdrC + shdr[i].sh_offset);
3060 nent = shdr[i].sh_size / sizeof(Elf_Sym);
3061 IF_DEBUG(linker,debugBelch( " number of entries is apparently %d (%ld rem)\n",
3063 (long)shdr[i].sh_size % sizeof(Elf_Sym)
3065 if (0 != shdr[i].sh_size % sizeof(Elf_Sym)) {
3066 errorBelch("%s: non-integral number of symbol table entries", oc->fileName);
3069 for (j = 0; j < nent; j++) {
3070 IF_DEBUG(linker,debugBelch(" %2d ", j ));
3071 IF_DEBUG(linker,debugBelch(" sec=%-5d size=%-3d val=%5p ",
3072 (int)stab[j].st_shndx,
3073 (int)stab[j].st_size,
3074 (char*)stab[j].st_value ));
3076 IF_DEBUG(linker,debugBelch("type=" ));
3077 switch (ELF_ST_TYPE(stab[j].st_info)) {
3078 case STT_NOTYPE: IF_DEBUG(linker,debugBelch("notype " )); break;
3079 case STT_OBJECT: IF_DEBUG(linker,debugBelch("object " )); break;
3080 case STT_FUNC : IF_DEBUG(linker,debugBelch("func " )); break;
3081 case STT_SECTION: IF_DEBUG(linker,debugBelch("section" )); break;
3082 case STT_FILE: IF_DEBUG(linker,debugBelch("file " )); break;
3083 default: IF_DEBUG(linker,debugBelch("? " )); break;
3085 IF_DEBUG(linker,debugBelch(" " ));
3087 IF_DEBUG(linker,debugBelch("bind=" ));
3088 switch (ELF_ST_BIND(stab[j].st_info)) {
3089 case STB_LOCAL : IF_DEBUG(linker,debugBelch("local " )); break;
3090 case STB_GLOBAL: IF_DEBUG(linker,debugBelch("global" )); break;
3091 case STB_WEAK : IF_DEBUG(linker,debugBelch("weak " )); break;
3092 default: IF_DEBUG(linker,debugBelch("? " )); break;
3094 IF_DEBUG(linker,debugBelch(" " ));
3096 IF_DEBUG(linker,debugBelch("name=%s\n", strtab + stab[j].st_name ));
3100 if (nsymtabs == 0) {
3101 errorBelch("%s: didn't find any symbol tables", oc->fileName);
3108 static int getSectionKind_ELF( Elf_Shdr *hdr, int *is_bss )
3112 if (hdr->sh_type == SHT_PROGBITS
3113 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_EXECINSTR)) {
3114 /* .text-style section */
3115 return SECTIONKIND_CODE_OR_RODATA;
3118 if (hdr->sh_type == SHT_PROGBITS
3119 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_WRITE)) {
3120 /* .data-style section */
3121 return SECTIONKIND_RWDATA;
3124 if (hdr->sh_type == SHT_PROGBITS
3125 && (hdr->sh_flags & SHF_ALLOC) && !(hdr->sh_flags & SHF_WRITE)) {
3126 /* .rodata-style section */
3127 return SECTIONKIND_CODE_OR_RODATA;
3130 if (hdr->sh_type == SHT_NOBITS
3131 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_WRITE)) {
3132 /* .bss-style section */
3134 return SECTIONKIND_RWDATA;
3137 return SECTIONKIND_OTHER;
3142 ocGetNames_ELF ( ObjectCode* oc )
3147 char* ehdrC = (char*)(oc->image);
3148 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
3149 char* strtab = findElfSection ( ehdrC, SHT_STRTAB );
3150 Elf_Shdr* shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
3152 ASSERT(symhash != NULL);
3155 errorBelch("%s: no strtab", oc->fileName);
3160 for (i = 0; i < ehdr->e_shnum; i++) {
3161 /* Figure out what kind of section it is. Logic derived from
3162 Figure 1.14 ("Special Sections") of the ELF document
3163 ("Portable Formats Specification, Version 1.1"). */
3165 SectionKind kind = getSectionKind_ELF(&shdr[i], &is_bss);
3167 if (is_bss && shdr[i].sh_size > 0) {
3168 /* This is a non-empty .bss section. Allocate zeroed space for
3169 it, and set its .sh_offset field such that
3170 ehdrC + .sh_offset == addr_of_zeroed_space. */
3171 char* zspace = stgCallocBytes(1, shdr[i].sh_size,
3172 "ocGetNames_ELF(BSS)");
3173 shdr[i].sh_offset = ((char*)zspace) - ((char*)ehdrC);
3175 debugBelch("BSS section at 0x%x, size %d\n",
3176 zspace, shdr[i].sh_size);
3180 /* fill in the section info */
3181 if (kind != SECTIONKIND_OTHER && shdr[i].sh_size > 0) {
3182 addProddableBlock(oc, ehdrC + shdr[i].sh_offset, shdr[i].sh_size);
3183 addSection(oc, kind, ehdrC + shdr[i].sh_offset,
3184 ehdrC + shdr[i].sh_offset + shdr[i].sh_size - 1);
3187 if (shdr[i].sh_type != SHT_SYMTAB) continue;
3189 /* copy stuff into this module's object symbol table */
3190 stab = (Elf_Sym*) (ehdrC + shdr[i].sh_offset);
3191 nent = shdr[i].sh_size / sizeof(Elf_Sym);
3193 oc->n_symbols = nent;
3194 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
3195 "ocGetNames_ELF(oc->symbols)");
3197 for (j = 0; j < nent; j++) {
3199 char isLocal = FALSE; /* avoids uninit-var warning */
3201 char* nm = strtab + stab[j].st_name;
3202 int secno = stab[j].st_shndx;
3204 /* Figure out if we want to add it; if so, set ad to its
3205 address. Otherwise leave ad == NULL. */
3207 if (secno == SHN_COMMON) {
3209 ad = stgCallocBytes(1, stab[j].st_size, "ocGetNames_ELF(COMMON)");
3211 debugBelch("COMMON symbol, size %d name %s\n",
3212 stab[j].st_size, nm);
3214 /* Pointless to do addProddableBlock() for this area,
3215 since the linker should never poke around in it. */
3218 if ( ( ELF_ST_BIND(stab[j].st_info)==STB_GLOBAL
3219 || ELF_ST_BIND(stab[j].st_info)==STB_LOCAL
3221 /* and not an undefined symbol */
3222 && stab[j].st_shndx != SHN_UNDEF
3223 /* and not in a "special section" */
3224 && stab[j].st_shndx < SHN_LORESERVE
3226 /* and it's a not a section or string table or anything silly */
3227 ( ELF_ST_TYPE(stab[j].st_info)==STT_FUNC ||
3228 ELF_ST_TYPE(stab[j].st_info)==STT_OBJECT ||
3229 ELF_ST_TYPE(stab[j].st_info)==STT_NOTYPE
3232 /* Section 0 is the undefined section, hence > and not >=. */
3233 ASSERT(secno > 0 && secno < ehdr->e_shnum);
3235 if (shdr[secno].sh_type == SHT_NOBITS) {
3236 debugBelch(" BSS symbol, size %d off %d name %s\n",
3237 stab[j].st_size, stab[j].st_value, nm);
3240 ad = ehdrC + shdr[ secno ].sh_offset + stab[j].st_value;
3241 if (ELF_ST_BIND(stab[j].st_info)==STB_LOCAL) {
3244 #ifdef ELF_FUNCTION_DESC
3245 /* dlsym() and the initialisation table both give us function
3246 * descriptors, so to be consistent we store function descriptors
3247 * in the symbol table */
3248 if (ELF_ST_TYPE(stab[j].st_info) == STT_FUNC)
3249 ad = (char *)allocateFunctionDesc((Elf_Addr)ad);
3251 IF_DEBUG(linker,debugBelch( "addOTabName(GLOB): %10p %s %s\n",
3252 ad, oc->fileName, nm ));
3257 /* And the decision is ... */
3261 oc->symbols[j] = nm;
3264 /* Ignore entirely. */
3266 ghciInsertStrHashTable(oc->fileName, symhash, nm, ad);
3270 IF_DEBUG(linker,debugBelch( "skipping `%s'\n",
3271 strtab + stab[j].st_name ));
3274 "skipping bind = %d, type = %d, shndx = %d `%s'\n",
3275 (int)ELF_ST_BIND(stab[j].st_info),
3276 (int)ELF_ST_TYPE(stab[j].st_info),
3277 (int)stab[j].st_shndx,
3278 strtab + stab[j].st_name
3281 oc->symbols[j] = NULL;
3290 /* Do ELF relocations which lack an explicit addend. All x86-linux
3291 relocations appear to be of this form. */
3293 do_Elf_Rel_relocations ( ObjectCode* oc, char* ehdrC,
3294 Elf_Shdr* shdr, int shnum,
3295 Elf_Sym* stab, char* strtab )
3300 Elf_Rel* rtab = (Elf_Rel*) (ehdrC + shdr[shnum].sh_offset);
3301 int nent = shdr[shnum].sh_size / sizeof(Elf_Rel);
3302 int target_shndx = shdr[shnum].sh_info;
3303 int symtab_shndx = shdr[shnum].sh_link;
3305 stab = (Elf_Sym*) (ehdrC + shdr[ symtab_shndx ].sh_offset);
3306 targ = (Elf_Word*)(ehdrC + shdr[ target_shndx ].sh_offset);
3307 IF_DEBUG(linker,debugBelch( "relocations for section %d using symtab %d\n",
3308 target_shndx, symtab_shndx ));
3310 /* Skip sections that we're not interested in. */
3313 SectionKind kind = getSectionKind_ELF(&shdr[target_shndx], &is_bss);
3314 if (kind == SECTIONKIND_OTHER) {
3315 IF_DEBUG(linker,debugBelch( "skipping (target section not loaded)"));
3320 for (j = 0; j < nent; j++) {
3321 Elf_Addr offset = rtab[j].r_offset;
3322 Elf_Addr info = rtab[j].r_info;
3324 Elf_Addr P = ((Elf_Addr)targ) + offset;
3325 Elf_Word* pP = (Elf_Word*)P;
3330 StgStablePtr stablePtr;
3333 IF_DEBUG(linker,debugBelch( "Rel entry %3d is raw(%6p %6p)",
3334 j, (void*)offset, (void*)info ));
3336 IF_DEBUG(linker,debugBelch( " ZERO" ));
3339 Elf_Sym sym = stab[ELF_R_SYM(info)];
3340 /* First see if it is a local symbol. */
3341 if (ELF_ST_BIND(sym.st_info) == STB_LOCAL) {
3342 /* Yes, so we can get the address directly from the ELF symbol
3344 symbol = sym.st_name==0 ? "(noname)" : strtab+sym.st_name;
3346 (ehdrC + shdr[ sym.st_shndx ].sh_offset
3347 + stab[ELF_R_SYM(info)].st_value);
3350 symbol = strtab + sym.st_name;
3351 stablePtr = (StgStablePtr)lookupHashTable(stablehash, (StgWord)symbol);
3352 if (NULL == stablePtr) {
3353 /* No, so look up the name in our global table. */
3354 S_tmp = lookupSymbol( symbol );
3355 S = (Elf_Addr)S_tmp;
3357 stableVal = deRefStablePtr( stablePtr );
3359 S = (Elf_Addr)S_tmp;
3363 errorBelch("%s: unknown symbol `%s'", oc->fileName, symbol);
3366 IF_DEBUG(linker,debugBelch( "`%s' resolves to %p\n", symbol, (void*)S ));
3369 IF_DEBUG(linker,debugBelch( "Reloc: P = %p S = %p A = %p\n",
3370 (void*)P, (void*)S, (void*)A ));
3371 checkProddableBlock ( oc, pP );
3375 switch (ELF_R_TYPE(info)) {
3376 # ifdef i386_HOST_ARCH
3377 case R_386_32: *pP = value; break;
3378 case R_386_PC32: *pP = value - P; break;
3381 errorBelch("%s: unhandled ELF relocation(Rel) type %lu\n",
3382 oc->fileName, (lnat)ELF_R_TYPE(info));
3390 /* Do ELF relocations for which explicit addends are supplied.
3391 sparc-solaris relocations appear to be of this form. */
3393 do_Elf_Rela_relocations ( ObjectCode* oc, char* ehdrC,
3394 Elf_Shdr* shdr, int shnum,
3395 Elf_Sym* stab, char* strtab )
3398 char *symbol = NULL;
3400 Elf_Rela* rtab = (Elf_Rela*) (ehdrC + shdr[shnum].sh_offset);
3401 int nent = shdr[shnum].sh_size / sizeof(Elf_Rela);
3402 int target_shndx = shdr[shnum].sh_info;
3403 int symtab_shndx = shdr[shnum].sh_link;
3405 stab = (Elf_Sym*) (ehdrC + shdr[ symtab_shndx ].sh_offset);
3406 targ = (Elf_Addr) (ehdrC + shdr[ target_shndx ].sh_offset);
3407 IF_DEBUG(linker,debugBelch( "relocations for section %d using symtab %d\n",
3408 target_shndx, symtab_shndx ));
3410 for (j = 0; j < nent; j++) {
3411 #if defined(DEBUG) || defined(sparc_HOST_ARCH) || defined(ia64_HOST_ARCH) || defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH)
3412 /* This #ifdef only serves to avoid unused-var warnings. */
3413 Elf_Addr offset = rtab[j].r_offset;
3414 Elf_Addr P = targ + offset;
3416 Elf_Addr info = rtab[j].r_info;
3417 Elf_Addr A = rtab[j].r_addend;
3421 # if defined(sparc_HOST_ARCH)
3422 Elf_Word* pP = (Elf_Word*)P;
3424 # elif defined(ia64_HOST_ARCH)
3425 Elf64_Xword *pP = (Elf64_Xword *)P;
3427 # elif defined(powerpc_HOST_ARCH)
3431 IF_DEBUG(linker,debugBelch( "Rel entry %3d is raw(%6p %6p %6p) ",
3432 j, (void*)offset, (void*)info,
3435 IF_DEBUG(linker,debugBelch( " ZERO" ));
3438 Elf_Sym sym = stab[ELF_R_SYM(info)];
3439 /* First see if it is a local symbol. */
3440 if (ELF_ST_BIND(sym.st_info) == STB_LOCAL) {
3441 /* Yes, so we can get the address directly from the ELF symbol
3443 symbol = sym.st_name==0 ? "(noname)" : strtab+sym.st_name;
3445 (ehdrC + shdr[ sym.st_shndx ].sh_offset
3446 + stab[ELF_R_SYM(info)].st_value);
3447 #ifdef ELF_FUNCTION_DESC
3448 /* Make a function descriptor for this function */
3449 if (S && ELF_ST_TYPE(sym.st_info) == STT_FUNC) {
3450 S = allocateFunctionDesc(S + A);
3455 /* No, so look up the name in our global table. */
3456 symbol = strtab + sym.st_name;
3457 S_tmp = lookupSymbol( symbol );
3458 S = (Elf_Addr)S_tmp;
3460 #ifdef ELF_FUNCTION_DESC
3461 /* If a function, already a function descriptor - we would
3462 have to copy it to add an offset. */
3463 if (S && (ELF_ST_TYPE(sym.st_info) == STT_FUNC) && (A != 0))
3464 errorBelch("%s: function %s with addend %p", oc->fileName, symbol, (void *)A);
3468 errorBelch("%s: unknown symbol `%s'", oc->fileName, symbol);
3471 IF_DEBUG(linker,debugBelch( "`%s' resolves to %p", symbol, (void*)S ));
3474 IF_DEBUG(linker,debugBelch("Reloc: P = %p S = %p A = %p\n",
3475 (void*)P, (void*)S, (void*)A ));
3476 /* checkProddableBlock ( oc, (void*)P ); */
3480 switch (ELF_R_TYPE(info)) {
3481 # if defined(sparc_HOST_ARCH)
3482 case R_SPARC_WDISP30:
3483 w1 = *pP & 0xC0000000;
3484 w2 = (Elf_Word)((value - P) >> 2);
3485 ASSERT((w2 & 0xC0000000) == 0);
3490 w1 = *pP & 0xFFC00000;
3491 w2 = (Elf_Word)(value >> 10);
3492 ASSERT((w2 & 0xFFC00000) == 0);
3498 w2 = (Elf_Word)(value & 0x3FF);
3499 ASSERT((w2 & ~0x3FF) == 0);
3504 /* According to the Sun documentation:
3506 This relocation type resembles R_SPARC_32, except it refers to an
3507 unaligned word. That is, the word to be relocated must be treated
3508 as four separate bytes with arbitrary alignment, not as a word
3509 aligned according to the architecture requirements.
3512 w2 = (Elf_Word)value;
3514 // SPARC doesn't do misaligned writes of 32 bit words,
3515 // so we have to do this one byte-at-a-time.
3516 char *pPc = (char*)pP;
3517 pPc[0] = (char) ((Elf_Word)(w2 & 0xff000000) >> 24);
3518 pPc[1] = (char) ((Elf_Word)(w2 & 0x00ff0000) >> 16);
3519 pPc[2] = (char) ((Elf_Word)(w2 & 0x0000ff00) >> 8);
3520 pPc[3] = (char) ((Elf_Word)(w2 & 0x000000ff));
3524 w2 = (Elf_Word)value;
3527 # elif defined(ia64_HOST_ARCH)
3528 case R_IA64_DIR64LSB:
3529 case R_IA64_FPTR64LSB:
3532 case R_IA64_PCREL64LSB:
3535 case R_IA64_SEGREL64LSB:
3536 addr = findElfSegment(ehdrC, value);
3539 case R_IA64_GPREL22:
3540 ia64_reloc_gprel22(P, value);
3542 case R_IA64_LTOFF22:
3543 case R_IA64_LTOFF22X:
3544 case R_IA64_LTOFF_FPTR22:
3545 addr = allocateGOTEntry(value);
3546 ia64_reloc_gprel22(P, addr);
3548 case R_IA64_PCREL21B:
3549 ia64_reloc_pcrel21(P, S, oc);
3552 /* This goes with R_IA64_LTOFF22X and points to the load to
3553 * convert into a move. We don't implement relaxation. */
3555 # elif defined(powerpc_HOST_ARCH)
3556 case R_PPC_ADDR16_LO:
3557 *(Elf32_Half*) P = value;
3560 case R_PPC_ADDR16_HI:
3561 *(Elf32_Half*) P = value >> 16;
3564 case R_PPC_ADDR16_HA:
3565 *(Elf32_Half*) P = (value + 0x8000) >> 16;
3569 *(Elf32_Word *) P = value;
3573 *(Elf32_Word *) P = value - P;
3579 if( delta << 6 >> 6 != delta )
3581 value = (Elf_Addr) (&makeSymbolExtra( oc, ELF_R_SYM(info), value )
3585 if( value == 0 || delta << 6 >> 6 != delta )
3587 barf( "Unable to make SymbolExtra for #%d",
3593 *(Elf_Word *) P = (*(Elf_Word *) P & 0xfc000003)
3594 | (delta & 0x3fffffc);
3598 #if x86_64_HOST_ARCH
3600 *(Elf64_Xword *)P = value;
3605 StgInt64 off = value - P;
3606 if (off >= 0x7fffffffL || off < -0x80000000L) {
3607 #if X86_64_ELF_NONPIC_HACK
3608 StgInt64 pltAddress = (StgInt64) &makeSymbolExtra(oc, ELF_R_SYM(info), S)
3610 off = pltAddress + A - P;
3612 barf("R_X86_64_PC32 relocation out of range: %s = %p\nRecompile %s with -fPIC.",
3613 symbol, off, oc->fileName );
3616 *(Elf64_Word *)P = (Elf64_Word)off;
3622 StgInt64 off = value - P;
3623 *(Elf64_Word *)P = (Elf64_Word)off;
3628 if (value >= 0x7fffffffL) {
3629 #if X86_64_ELF_NONPIC_HACK
3630 StgInt64 pltAddress = (StgInt64) &makeSymbolExtra(oc, ELF_R_SYM(info), S)
3632 value = pltAddress + A;
3634 barf("R_X86_64_32 relocation out of range: %s = %p\nRecompile %s with -fPIC.",
3635 symbol, value, oc->fileName );
3638 *(Elf64_Word *)P = (Elf64_Word)value;
3642 if ((StgInt64)value > 0x7fffffffL || (StgInt64)value < -0x80000000L) {
3643 #if X86_64_ELF_NONPIC_HACK
3644 StgInt64 pltAddress = (StgInt64) &makeSymbolExtra(oc, ELF_R_SYM(info), S)
3646 value = pltAddress + A;
3648 barf("R_X86_64_32S relocation out of range: %s = %p\nRecompile %s with -fPIC.",
3649 symbol, value, oc->fileName );
3652 *(Elf64_Sword *)P = (Elf64_Sword)value;
3655 case R_X86_64_GOTPCREL:
3657 StgInt64 gotAddress = (StgInt64) &makeSymbolExtra(oc, ELF_R_SYM(info), S)->addr;
3658 StgInt64 off = gotAddress + A - P;
3659 *(Elf64_Word *)P = (Elf64_Word)off;
3663 case R_X86_64_PLT32:
3665 StgInt64 off = value - P;
3666 if (off >= 0x7fffffffL || off < -0x80000000L) {
3667 StgInt64 pltAddress = (StgInt64) &makeSymbolExtra(oc, ELF_R_SYM(info), S)
3669 off = pltAddress + A - P;
3671 *(Elf64_Word *)P = (Elf64_Word)off;
3677 errorBelch("%s: unhandled ELF relocation(RelA) type %lu\n",
3678 oc->fileName, (lnat)ELF_R_TYPE(info));
3687 ocResolve_ELF ( ObjectCode* oc )
3691 Elf_Sym* stab = NULL;
3692 char* ehdrC = (char*)(oc->image);
3693 Elf_Ehdr* ehdr = (Elf_Ehdr*) ehdrC;
3694 Elf_Shdr* shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
3696 /* first find "the" symbol table */
3697 stab = (Elf_Sym*) findElfSection ( ehdrC, SHT_SYMTAB );
3699 /* also go find the string table */
3700 strtab = findElfSection ( ehdrC, SHT_STRTAB );
3702 if (stab == NULL || strtab == NULL) {
3703 errorBelch("%s: can't find string or symbol table", oc->fileName);
3707 /* Process the relocation sections. */
3708 for (shnum = 0; shnum < ehdr->e_shnum; shnum++) {
3709 if (shdr[shnum].sh_type == SHT_REL) {
3710 ok = do_Elf_Rel_relocations ( oc, ehdrC, shdr,
3711 shnum, stab, strtab );
3715 if (shdr[shnum].sh_type == SHT_RELA) {
3716 ok = do_Elf_Rela_relocations ( oc, ehdrC, shdr,
3717 shnum, stab, strtab );
3722 #if defined(powerpc_HOST_ARCH)
3723 ocFlushInstructionCache( oc );
3731 * Instructions are 41 bits long, packed into 128 bit bundles with a 5-bit template
3732 * at the front. The following utility functions pack and unpack instructions, and
3733 * take care of the most common relocations.
3736 #ifdef ia64_HOST_ARCH
3739 ia64_extract_instruction(Elf64_Xword *target)
3742 int slot = (Elf_Addr)target & 3;
3743 target = (Elf_Addr)target & ~3;
3751 return ((w1 >> 5) & 0x1ffffffffff);
3753 return (w1 >> 46) | ((w2 & 0x7fffff) << 18);
3757 barf("ia64_extract_instruction: invalid slot %p", target);
3762 ia64_deposit_instruction(Elf64_Xword *target, Elf64_Xword value)
3764 int slot = (Elf_Addr)target & 3;
3765 target = (Elf_Addr)target & ~3;
3770 *target |= value << 5;
3773 *target |= value << 46;
3774 *(target+1) |= value >> 18;
3777 *(target+1) |= value << 23;
3783 ia64_reloc_gprel22(Elf_Addr target, Elf_Addr value)
3785 Elf64_Xword instruction;
3786 Elf64_Sxword rel_value;
3788 rel_value = value - gp_val;
3789 if ((rel_value > 0x1fffff) || (rel_value < -0x1fffff))
3790 barf("GP-relative data out of range (address = 0x%lx, gp = 0x%lx)", value, gp_val);
3792 instruction = ia64_extract_instruction((Elf64_Xword *)target);
3793 instruction |= (((rel_value >> 0) & 0x07f) << 13) /* imm7b */
3794 | (((rel_value >> 7) & 0x1ff) << 27) /* imm9d */
3795 | (((rel_value >> 16) & 0x01f) << 22) /* imm5c */
3796 | ((Elf64_Xword)(rel_value < 0) << 36); /* s */
3797 ia64_deposit_instruction((Elf64_Xword *)target, instruction);
3801 ia64_reloc_pcrel21(Elf_Addr target, Elf_Addr value, ObjectCode *oc)
3803 Elf64_Xword instruction;
3804 Elf64_Sxword rel_value;
3807 entry = allocatePLTEntry(value, oc);
3809 rel_value = (entry >> 4) - (target >> 4);
3810 if ((rel_value > 0xfffff) || (rel_value < -0xfffff))
3811 barf("PLT entry too far away (entry = 0x%lx, target = 0x%lx)", entry, target);
3813 instruction = ia64_extract_instruction((Elf64_Xword *)target);
3814 instruction |= ((rel_value & 0xfffff) << 13) /* imm20b */
3815 | ((Elf64_Xword)(rel_value < 0) << 36); /* s */
3816 ia64_deposit_instruction((Elf64_Xword *)target, instruction);
3822 * PowerPC & X86_64 ELF specifics
3825 #if defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH)
3827 static int ocAllocateSymbolExtras_ELF( ObjectCode *oc )
3833 ehdr = (Elf_Ehdr *) oc->image;
3834 shdr = (Elf_Shdr *) ( ((char *)oc->image) + ehdr->e_shoff );
3836 for( i = 0; i < ehdr->e_shnum; i++ )
3837 if( shdr[i].sh_type == SHT_SYMTAB )
3840 if( i == ehdr->e_shnum )
3842 errorBelch( "This ELF file contains no symtab" );
3846 if( shdr[i].sh_entsize != sizeof( Elf_Sym ) )
3848 errorBelch( "The entry size (%d) of the symtab isn't %d\n",
3849 (int) shdr[i].sh_entsize, (int) sizeof( Elf_Sym ) );
3854 return ocAllocateSymbolExtras( oc, shdr[i].sh_size / sizeof( Elf_Sym ), 0 );
3857 #endif /* powerpc */
3861 /* --------------------------------------------------------------------------
3863 * ------------------------------------------------------------------------*/
3865 #if defined(OBJFORMAT_MACHO)
3868 Support for MachO linking on Darwin/MacOS X
3869 by Wolfgang Thaller (wolfgang.thaller@gmx.net)
3871 I hereby formally apologize for the hackish nature of this code.
3872 Things that need to be done:
3873 *) implement ocVerifyImage_MachO
3874 *) add still more sanity checks.
3877 #if x86_64_HOST_ARCH || powerpc64_HOST_ARCH
3878 #define mach_header mach_header_64
3879 #define segment_command segment_command_64
3880 #define section section_64
3881 #define nlist nlist_64
3884 #ifdef powerpc_HOST_ARCH
3885 static int ocAllocateSymbolExtras_MachO(ObjectCode* oc)
3887 struct mach_header *header = (struct mach_header *) oc->image;
3888 struct load_command *lc = (struct load_command *) (header + 1);
3891 for( i = 0; i < header->ncmds; i++ )
3893 if( lc->cmd == LC_SYMTAB )
3895 // Find out the first and last undefined external
3896 // symbol, so we don't have to allocate too many
3898 struct symtab_command *symLC = (struct symtab_command *) lc;
3899 unsigned min = symLC->nsyms, max = 0;
3900 struct nlist *nlist =
3901 symLC ? (struct nlist*) ((char*) oc->image + symLC->symoff)
3903 for(i=0;i<symLC->nsyms;i++)
3905 if(nlist[i].n_type & N_STAB)
3907 else if(nlist[i].n_type & N_EXT)
3909 if((nlist[i].n_type & N_TYPE) == N_UNDF
3910 && (nlist[i].n_value == 0))
3920 return ocAllocateSymbolExtras(oc, max - min + 1, min);
3925 lc = (struct load_command *) ( ((char *)lc) + lc->cmdsize );
3927 return ocAllocateSymbolExtras(oc,0,0);
3930 #ifdef x86_64_HOST_ARCH
3931 static int ocAllocateSymbolExtras_MachO(ObjectCode* oc)
3933 struct mach_header *header = (struct mach_header *) oc->image;
3934 struct load_command *lc = (struct load_command *) (header + 1);
3937 for( i = 0; i < header->ncmds; i++ )
3939 if( lc->cmd == LC_SYMTAB )
3941 // Just allocate one entry for every symbol
3942 struct symtab_command *symLC = (struct symtab_command *) lc;
3944 return ocAllocateSymbolExtras(oc, symLC->nsyms, 0);
3947 lc = (struct load_command *) ( ((char *)lc) + lc->cmdsize );
3949 return ocAllocateSymbolExtras(oc,0,0);
3953 static int ocVerifyImage_MachO(ObjectCode* oc)
3955 char *image = (char*) oc->image;
3956 struct mach_header *header = (struct mach_header*) image;
3958 #if x86_64_TARGET_ARCH || powerpc64_TARGET_ARCH
3959 if(header->magic != MH_MAGIC_64)
3962 if(header->magic != MH_MAGIC)
3965 // FIXME: do some more verifying here
3969 static int resolveImports(
3972 struct symtab_command *symLC,
3973 struct section *sect, // ptr to lazy or non-lazy symbol pointer section
3974 unsigned long *indirectSyms,
3975 struct nlist *nlist)
3978 size_t itemSize = 4;
3981 int isJumpTable = 0;
3982 if(!strcmp(sect->sectname,"__jump_table"))
3986 ASSERT(sect->reserved2 == itemSize);
3990 for(i=0; i*itemSize < sect->size;i++)
3992 // according to otool, reserved1 contains the first index into the indirect symbol table
3993 struct nlist *symbol = &nlist[indirectSyms[sect->reserved1+i]];
3994 char *nm = image + symLC->stroff + symbol->n_un.n_strx;
3997 if((symbol->n_type & N_TYPE) == N_UNDF
3998 && (symbol->n_type & N_EXT) && (symbol->n_value != 0))
3999 addr = (void*) (symbol->n_value);
4001 addr = lookupSymbol(nm);
4004 errorBelch("\n%s: unknown symbol `%s'", oc->fileName, nm);
4012 checkProddableBlock(oc,image + sect->offset + i*itemSize);
4013 *(image + sect->offset + i*itemSize) = 0xe9; // jmp
4014 *(unsigned*)(image + sect->offset + i*itemSize + 1)
4015 = (char*)addr - (image + sect->offset + i*itemSize + 5);
4020 checkProddableBlock(oc,((void**)(image + sect->offset)) + i);
4021 ((void**)(image + sect->offset))[i] = addr;
4028 static unsigned long relocateAddress(
4031 struct section* sections,
4032 unsigned long address)
4035 for(i = 0; i < nSections; i++)
4037 if(sections[i].addr <= address
4038 && address < sections[i].addr + sections[i].size)
4040 return (unsigned long)oc->image
4041 + sections[i].offset + address - sections[i].addr;
4044 barf("Invalid Mach-O file:"
4045 "Address out of bounds while relocating object file");
4049 static int relocateSection(
4052 struct symtab_command *symLC, struct nlist *nlist,
4053 int nSections, struct section* sections, struct section *sect)
4055 struct relocation_info *relocs;
4058 if(!strcmp(sect->sectname,"__la_symbol_ptr"))
4060 else if(!strcmp(sect->sectname,"__nl_symbol_ptr"))
4062 else if(!strcmp(sect->sectname,"__la_sym_ptr2"))
4064 else if(!strcmp(sect->sectname,"__la_sym_ptr3"))
4068 relocs = (struct relocation_info*) (image + sect->reloff);
4072 #ifdef x86_64_HOST_ARCH
4073 struct relocation_info *reloc = &relocs[i];
4075 char *thingPtr = image + sect->offset + reloc->r_address;
4077 /* We shouldn't need to initialise this, but gcc on OS X 64 bit
4078 complains that it may be used uninitialized if we don't */
4081 int type = reloc->r_type;
4083 checkProddableBlock(oc,thingPtr);
4084 switch(reloc->r_length)
4087 thing = *(uint8_t*)thingPtr;
4088 baseValue = (uint64_t)thingPtr + 1;
4091 thing = *(uint16_t*)thingPtr;
4092 baseValue = (uint64_t)thingPtr + 2;
4095 thing = *(uint32_t*)thingPtr;
4096 baseValue = (uint64_t)thingPtr + 4;
4099 thing = *(uint64_t*)thingPtr;
4100 baseValue = (uint64_t)thingPtr + 8;
4103 barf("Unknown size.");
4106 if(type == X86_64_RELOC_GOT
4107 || type == X86_64_RELOC_GOT_LOAD)
4109 ASSERT(reloc->r_extern);
4110 value = (uint64_t) &makeSymbolExtra(oc, reloc->r_symbolnum, value)->addr;
4112 type = X86_64_RELOC_SIGNED;
4114 else if(reloc->r_extern)
4116 struct nlist *symbol = &nlist[reloc->r_symbolnum];
4117 char *nm = image + symLC->stroff + symbol->n_un.n_strx;
4118 if(symbol->n_value == 0)
4119 value = (uint64_t) lookupSymbol(nm);
4121 value = relocateAddress(oc, nSections, sections,
4126 value = sections[reloc->r_symbolnum-1].offset
4127 - sections[reloc->r_symbolnum-1].addr
4131 if(type == X86_64_RELOC_BRANCH)
4133 if((int32_t)(value - baseValue) != (int64_t)(value - baseValue))
4135 ASSERT(reloc->r_extern);
4136 value = (uint64_t) &makeSymbolExtra(oc, reloc->r_symbolnum, value)
4139 ASSERT((int32_t)(value - baseValue) == (int64_t)(value - baseValue));
4140 type = X86_64_RELOC_SIGNED;
4145 case X86_64_RELOC_UNSIGNED:
4146 ASSERT(!reloc->r_pcrel);
4149 case X86_64_RELOC_SIGNED:
4150 ASSERT(reloc->r_pcrel);
4151 thing += value - baseValue;
4153 case X86_64_RELOC_SUBTRACTOR:
4154 ASSERT(!reloc->r_pcrel);
4158 barf("unkown relocation");
4161 switch(reloc->r_length)
4164 *(uint8_t*)thingPtr = thing;
4167 *(uint16_t*)thingPtr = thing;
4170 *(uint32_t*)thingPtr = thing;
4173 *(uint64_t*)thingPtr = thing;
4177 if(relocs[i].r_address & R_SCATTERED)
4179 struct scattered_relocation_info *scat =
4180 (struct scattered_relocation_info*) &relocs[i];
4184 if(scat->r_length == 2)
4186 unsigned long word = 0;
4187 unsigned long* wordPtr = (unsigned long*) (image + sect->offset + scat->r_address);
4188 checkProddableBlock(oc,wordPtr);
4190 // Note on relocation types:
4191 // i386 uses the GENERIC_RELOC_* types,
4192 // while ppc uses special PPC_RELOC_* types.
4193 // *_RELOC_VANILLA and *_RELOC_PAIR have the same value
4194 // in both cases, all others are different.
4195 // Therefore, we use GENERIC_RELOC_VANILLA
4196 // and GENERIC_RELOC_PAIR instead of the PPC variants,
4197 // and use #ifdefs for the other types.
4199 // Step 1: Figure out what the relocated value should be
4200 if(scat->r_type == GENERIC_RELOC_VANILLA)
4202 word = *wordPtr + (unsigned long) relocateAddress(
4209 #ifdef powerpc_HOST_ARCH
4210 else if(scat->r_type == PPC_RELOC_SECTDIFF
4211 || scat->r_type == PPC_RELOC_LO16_SECTDIFF
4212 || scat->r_type == PPC_RELOC_HI16_SECTDIFF
4213 || scat->r_type == PPC_RELOC_HA16_SECTDIFF)
4215 else if(scat->r_type == GENERIC_RELOC_SECTDIFF)
4218 struct scattered_relocation_info *pair =
4219 (struct scattered_relocation_info*) &relocs[i+1];
4221 if(!pair->r_scattered || pair->r_type != GENERIC_RELOC_PAIR)
4222 barf("Invalid Mach-O file: "
4223 "RELOC_*_SECTDIFF not followed by RELOC_PAIR");
4225 word = (unsigned long)
4226 (relocateAddress(oc, nSections, sections, scat->r_value)
4227 - relocateAddress(oc, nSections, sections, pair->r_value));
4230 #ifdef powerpc_HOST_ARCH
4231 else if(scat->r_type == PPC_RELOC_HI16
4232 || scat->r_type == PPC_RELOC_LO16
4233 || scat->r_type == PPC_RELOC_HA16
4234 || scat->r_type == PPC_RELOC_LO14)
4235 { // these are generated by label+offset things
4236 struct relocation_info *pair = &relocs[i+1];
4237 if((pair->r_address & R_SCATTERED) || pair->r_type != PPC_RELOC_PAIR)
4238 barf("Invalid Mach-O file: "
4239 "PPC_RELOC_* not followed by PPC_RELOC_PAIR");
4241 if(scat->r_type == PPC_RELOC_LO16)
4243 word = ((unsigned short*) wordPtr)[1];
4244 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
4246 else if(scat->r_type == PPC_RELOC_LO14)
4248 barf("Unsupported Relocation: PPC_RELOC_LO14");
4249 word = ((unsigned short*) wordPtr)[1] & 0xFFFC;
4250 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
4252 else if(scat->r_type == PPC_RELOC_HI16)
4254 word = ((unsigned short*) wordPtr)[1] << 16;
4255 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF);
4257 else if(scat->r_type == PPC_RELOC_HA16)
4259 word = ((unsigned short*) wordPtr)[1] << 16;
4260 word += ((short)relocs[i+1].r_address & (short)0xFFFF);
4264 word += (unsigned long) relocateAddress(oc, nSections, sections, scat->r_value)
4271 continue; // ignore the others
4273 #ifdef powerpc_HOST_ARCH
4274 if(scat->r_type == GENERIC_RELOC_VANILLA
4275 || scat->r_type == PPC_RELOC_SECTDIFF)
4277 if(scat->r_type == GENERIC_RELOC_VANILLA
4278 || scat->r_type == GENERIC_RELOC_SECTDIFF)
4283 #ifdef powerpc_HOST_ARCH
4284 else if(scat->r_type == PPC_RELOC_LO16_SECTDIFF || scat->r_type == PPC_RELOC_LO16)
4286 ((unsigned short*) wordPtr)[1] = word & 0xFFFF;
4288 else if(scat->r_type == PPC_RELOC_HI16_SECTDIFF || scat->r_type == PPC_RELOC_HI16)
4290 ((unsigned short*) wordPtr)[1] = (word >> 16) & 0xFFFF;
4292 else if(scat->r_type == PPC_RELOC_HA16_SECTDIFF || scat->r_type == PPC_RELOC_HA16)
4294 ((unsigned short*) wordPtr)[1] = ((word >> 16) & 0xFFFF)
4295 + ((word & (1<<15)) ? 1 : 0);
4301 continue; // FIXME: I hope it's OK to ignore all the others.
4305 struct relocation_info *reloc = &relocs[i];
4306 if(reloc->r_pcrel && !reloc->r_extern)
4309 if(reloc->r_length == 2)
4311 unsigned long word = 0;
4312 #ifdef powerpc_HOST_ARCH
4313 unsigned long jumpIsland = 0;
4314 long offsetToJumpIsland = 0xBADBAD42; // initialise to bad value
4315 // to avoid warning and to catch
4319 unsigned long* wordPtr = (unsigned long*) (image + sect->offset + reloc->r_address);
4320 checkProddableBlock(oc,wordPtr);
4322 if(reloc->r_type == GENERIC_RELOC_VANILLA)
4326 #ifdef powerpc_HOST_ARCH
4327 else if(reloc->r_type == PPC_RELOC_LO16)
4329 word = ((unsigned short*) wordPtr)[1];
4330 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
4332 else if(reloc->r_type == PPC_RELOC_HI16)
4334 word = ((unsigned short*) wordPtr)[1] << 16;
4335 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF);
4337 else if(reloc->r_type == PPC_RELOC_HA16)
4339 word = ((unsigned short*) wordPtr)[1] << 16;
4340 word += ((short)relocs[i+1].r_address & (short)0xFFFF);
4342 else if(reloc->r_type == PPC_RELOC_BR24)
4345 word = (word & 0x03FFFFFC) | ((word & 0x02000000) ? 0xFC000000 : 0);
4349 if(!reloc->r_extern)
4352 sections[reloc->r_symbolnum-1].offset
4353 - sections[reloc->r_symbolnum-1].addr
4360 struct nlist *symbol = &nlist[reloc->r_symbolnum];
4361 char *nm = image + symLC->stroff + symbol->n_un.n_strx;
4362 void *symbolAddress = lookupSymbol(nm);
4365 errorBelch("\nunknown symbol `%s'", nm);
4371 #ifdef powerpc_HOST_ARCH
4372 // In the .o file, this should be a relative jump to NULL
4373 // and we'll change it to a relative jump to the symbol
4374 ASSERT(word + reloc->r_address == 0);
4375 jumpIsland = (unsigned long)
4376 &makeSymbolExtra(oc,
4378 (unsigned long) symbolAddress)
4382 offsetToJumpIsland = word + jumpIsland
4383 - (((long)image) + sect->offset - sect->addr);
4386 word += (unsigned long) symbolAddress
4387 - (((long)image) + sect->offset - sect->addr);
4391 word += (unsigned long) symbolAddress;
4395 if(reloc->r_type == GENERIC_RELOC_VANILLA)
4400 #ifdef powerpc_HOST_ARCH
4401 else if(reloc->r_type == PPC_RELOC_LO16)
4403 ((unsigned short*) wordPtr)[1] = word & 0xFFFF;
4406 else if(reloc->r_type == PPC_RELOC_HI16)
4408 ((unsigned short*) wordPtr)[1] = (word >> 16) & 0xFFFF;
4411 else if(reloc->r_type == PPC_RELOC_HA16)
4413 ((unsigned short*) wordPtr)[1] = ((word >> 16) & 0xFFFF)
4414 + ((word & (1<<15)) ? 1 : 0);
4417 else if(reloc->r_type == PPC_RELOC_BR24)
4419 if((long)word > (long)0x01FFFFFF || (long)word < (long)0xFFE00000)
4421 // The branch offset is too large.
4422 // Therefore, we try to use a jump island.
4425 barf("unconditional relative branch out of range: "
4426 "no jump island available");
4429 word = offsetToJumpIsland;
4430 if((long)word > (long)0x01FFFFFF || (long)word < (long)0xFFE00000)
4431 barf("unconditional relative branch out of range: "
4432 "jump island out of range");
4434 *wordPtr = (*wordPtr & 0xFC000003) | (word & 0x03FFFFFC);
4439 barf("\nunknown relocation %d",reloc->r_type);
4447 static int ocGetNames_MachO(ObjectCode* oc)
4449 char *image = (char*) oc->image;
4450 struct mach_header *header = (struct mach_header*) image;
4451 struct load_command *lc = (struct load_command*) (image + sizeof(struct mach_header));
4452 unsigned i,curSymbol = 0;
4453 struct segment_command *segLC = NULL;
4454 struct section *sections;
4455 struct symtab_command *symLC = NULL;
4456 struct nlist *nlist;
4457 unsigned long commonSize = 0;
4458 char *commonStorage = NULL;
4459 unsigned long commonCounter;
4461 for(i=0;i<header->ncmds;i++)
4463 if(lc->cmd == LC_SEGMENT || lc->cmd == LC_SEGMENT_64)
4464 segLC = (struct segment_command*) lc;
4465 else if(lc->cmd == LC_SYMTAB)
4466 symLC = (struct symtab_command*) lc;
4467 lc = (struct load_command *) ( ((char*)lc) + lc->cmdsize );
4470 sections = (struct section*) (segLC+1);
4471 nlist = symLC ? (struct nlist*) (image + symLC->symoff)
4475 barf("ocGetNames_MachO: no segment load command");
4477 for(i=0;i<segLC->nsects;i++)
4479 if(sections[i].size == 0)
4482 if((sections[i].flags & SECTION_TYPE) == S_ZEROFILL)
4484 char * zeroFillArea = stgCallocBytes(1,sections[i].size,
4485 "ocGetNames_MachO(common symbols)");
4486 sections[i].offset = zeroFillArea - image;
4489 if(!strcmp(sections[i].sectname,"__text"))
4490 addSection(oc, SECTIONKIND_CODE_OR_RODATA,
4491 (void*) (image + sections[i].offset),
4492 (void*) (image + sections[i].offset + sections[i].size));
4493 else if(!strcmp(sections[i].sectname,"__const"))
4494 addSection(oc, SECTIONKIND_RWDATA,
4495 (void*) (image + sections[i].offset),
4496 (void*) (image + sections[i].offset + sections[i].size));
4497 else if(!strcmp(sections[i].sectname,"__data"))
4498 addSection(oc, SECTIONKIND_RWDATA,
4499 (void*) (image + sections[i].offset),
4500 (void*) (image + sections[i].offset + sections[i].size));
4501 else if(!strcmp(sections[i].sectname,"__bss")
4502 || !strcmp(sections[i].sectname,"__common"))
4503 addSection(oc, SECTIONKIND_RWDATA,
4504 (void*) (image + sections[i].offset),
4505 (void*) (image + sections[i].offset + sections[i].size));
4507 addProddableBlock(oc, (void*) (image + sections[i].offset),
4511 // count external symbols defined here
4515 for(i=0;i<symLC->nsyms;i++)
4517 if(nlist[i].n_type & N_STAB)
4519 else if(nlist[i].n_type & N_EXT)
4521 if((nlist[i].n_type & N_TYPE) == N_UNDF
4522 && (nlist[i].n_value != 0))
4524 commonSize += nlist[i].n_value;
4527 else if((nlist[i].n_type & N_TYPE) == N_SECT)
4532 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
4533 "ocGetNames_MachO(oc->symbols)");
4537 for(i=0;i<symLC->nsyms;i++)
4539 if(nlist[i].n_type & N_STAB)
4541 else if((nlist[i].n_type & N_TYPE) == N_SECT)
4543 if(nlist[i].n_type & N_EXT)
4545 char *nm = image + symLC->stroff + nlist[i].n_un.n_strx;
4546 if((nlist[i].n_desc & N_WEAK_DEF) && lookupSymbol(nm))
4547 ; // weak definition, and we already have a definition
4550 ghciInsertStrHashTable(oc->fileName, symhash, nm,
4552 + sections[nlist[i].n_sect-1].offset
4553 - sections[nlist[i].n_sect-1].addr
4554 + nlist[i].n_value);
4555 oc->symbols[curSymbol++] = nm;
4562 commonStorage = stgCallocBytes(1,commonSize,"ocGetNames_MachO(common symbols)");
4563 commonCounter = (unsigned long)commonStorage;
4566 for(i=0;i<symLC->nsyms;i++)
4568 if((nlist[i].n_type & N_TYPE) == N_UNDF
4569 && (nlist[i].n_type & N_EXT) && (nlist[i].n_value != 0))
4571 char *nm = image + symLC->stroff + nlist[i].n_un.n_strx;
4572 unsigned long sz = nlist[i].n_value;
4574 nlist[i].n_value = commonCounter;
4576 ghciInsertStrHashTable(oc->fileName, symhash, nm,
4577 (void*)commonCounter);
4578 oc->symbols[curSymbol++] = nm;
4580 commonCounter += sz;
4587 static int ocResolve_MachO(ObjectCode* oc)
4589 char *image = (char*) oc->image;
4590 struct mach_header *header = (struct mach_header*) image;
4591 struct load_command *lc = (struct load_command*) (image + sizeof(struct mach_header));
4593 struct segment_command *segLC = NULL;
4594 struct section *sections;
4595 struct symtab_command *symLC = NULL;
4596 struct dysymtab_command *dsymLC = NULL;
4597 struct nlist *nlist;
4599 for(i=0;i<header->ncmds;i++)
4601 if(lc->cmd == LC_SEGMENT || lc->cmd == LC_SEGMENT_64)
4602 segLC = (struct segment_command*) lc;
4603 else if(lc->cmd == LC_SYMTAB)
4604 symLC = (struct symtab_command*) lc;
4605 else if(lc->cmd == LC_DYSYMTAB)
4606 dsymLC = (struct dysymtab_command*) lc;
4607 lc = (struct load_command *) ( ((char*)lc) + lc->cmdsize );
4610 sections = (struct section*) (segLC+1);
4611 nlist = symLC ? (struct nlist*) (image + symLC->symoff)
4616 unsigned long *indirectSyms
4617 = (unsigned long*) (image + dsymLC->indirectsymoff);
4619 for(i=0;i<segLC->nsects;i++)
4621 if( !strcmp(sections[i].sectname,"__la_symbol_ptr")
4622 || !strcmp(sections[i].sectname,"__la_sym_ptr2")
4623 || !strcmp(sections[i].sectname,"__la_sym_ptr3"))
4625 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4628 else if(!strcmp(sections[i].sectname,"__nl_symbol_ptr")
4629 || !strcmp(sections[i].sectname,"__pointers"))
4631 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4634 else if(!strcmp(sections[i].sectname,"__jump_table"))
4636 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4642 for(i=0;i<segLC->nsects;i++)
4644 if(!relocateSection(oc,image,symLC,nlist,segLC->nsects,sections,§ions[i]))
4648 #if defined (powerpc_HOST_ARCH)
4649 ocFlushInstructionCache( oc );
4655 #ifdef powerpc_HOST_ARCH
4657 * The Mach-O object format uses leading underscores. But not everywhere.
4658 * There is a small number of runtime support functions defined in
4659 * libcc_dynamic.a whose name does not have a leading underscore.
4660 * As a consequence, we can't get their address from C code.
4661 * We have to use inline assembler just to take the address of a function.
4665 static void machoInitSymbolsWithoutUnderscore()
4667 extern void* symbolsWithoutUnderscore[];
4668 void **p = symbolsWithoutUnderscore;
4669 __asm__ volatile(".globl _symbolsWithoutUnderscore\n.data\n_symbolsWithoutUnderscore:");
4671 #undef SymI_NeedsProto
4672 #define SymI_NeedsProto(x) \
4673 __asm__ volatile(".long " # x);
4675 RTS_MACHO_NOUNDERLINE_SYMBOLS
4677 __asm__ volatile(".text");
4679 #undef SymI_NeedsProto
4680 #define SymI_NeedsProto(x) \
4681 ghciInsertStrHashTable("(GHCi built-in symbols)", symhash, #x, *p++);
4683 RTS_MACHO_NOUNDERLINE_SYMBOLS
4685 #undef SymI_NeedsProto
4690 * Figure out by how much to shift the entire Mach-O file in memory
4691 * when loading so that its single segment ends up 16-byte-aligned
4693 static int machoGetMisalignment( FILE * f )
4695 struct mach_header header;
4698 fread(&header, sizeof(header), 1, f);
4701 #if x86_64_TARGET_ARCH || powerpc64_TARGET_ARCH
4702 if(header.magic != MH_MAGIC_64)
4705 if(header.magic != MH_MAGIC)
4709 misalignment = (header.sizeofcmds + sizeof(header))
4712 return misalignment ? (16 - misalignment) : 0;