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 /* These are statically linked from the mingw libraries into the ghc
347 executable, so we have to employ this hack. */
348 #define RTS_MINGW_ONLY_SYMBOLS \
349 SymI_HasProto(asyncReadzh_fast) \
350 SymI_HasProto(asyncWritezh_fast) \
351 SymI_HasProto(asyncDoProczh_fast) \
352 SymI_HasProto(memset) \
353 SymI_HasProto(inet_ntoa) \
354 SymI_HasProto(inet_addr) \
355 SymI_HasProto(htonl) \
356 SymI_HasProto(recvfrom) \
357 SymI_HasProto(listen) \
358 SymI_HasProto(bind) \
359 SymI_HasProto(shutdown) \
360 SymI_HasProto(connect) \
361 SymI_HasProto(htons) \
362 SymI_HasProto(ntohs) \
363 SymI_HasProto(getservbyname) \
364 SymI_HasProto(getservbyport) \
365 SymI_HasProto(getprotobynumber) \
366 SymI_HasProto(getprotobyname) \
367 SymI_HasProto(gethostbyname) \
368 SymI_HasProto(gethostbyaddr) \
369 SymI_HasProto(gethostname) \
370 SymI_HasProto(strcpy) \
371 SymI_HasProto(strncpy) \
372 SymI_HasProto(abort) \
373 SymI_NeedsProto(_alloca) \
374 SymI_NeedsProto(isxdigit) \
375 SymI_NeedsProto(isupper) \
376 SymI_NeedsProto(ispunct) \
377 SymI_NeedsProto(islower) \
378 SymI_NeedsProto(isspace) \
379 SymI_NeedsProto(isprint) \
380 SymI_NeedsProto(isdigit) \
381 SymI_NeedsProto(iscntrl) \
382 SymI_NeedsProto(isalpha) \
383 SymI_NeedsProto(isalnum) \
384 SymI_HasProto(strcmp) \
385 SymI_HasProto(memmove) \
386 SymI_HasProto(realloc) \
387 SymI_HasProto(malloc) \
389 SymI_HasProto(tanh) \
390 SymI_HasProto(cosh) \
391 SymI_HasProto(sinh) \
392 SymI_HasProto(atan) \
393 SymI_HasProto(acos) \
394 SymI_HasProto(asin) \
400 SymI_HasProto(sqrt) \
401 SymI_HasProto(powf) \
402 SymI_HasProto(tanhf) \
403 SymI_HasProto(coshf) \
404 SymI_HasProto(sinhf) \
405 SymI_HasProto(atanf) \
406 SymI_HasProto(acosf) \
407 SymI_HasProto(asinf) \
408 SymI_HasProto(tanf) \
409 SymI_HasProto(cosf) \
410 SymI_HasProto(sinf) \
411 SymI_HasProto(expf) \
412 SymI_HasProto(logf) \
413 SymI_HasProto(sqrtf) \
414 SymI_HasProto(memcpy) \
415 SymI_HasProto(rts_InstallConsoleEvent) \
416 SymI_HasProto(rts_ConsoleHandlerDone) \
417 SymI_NeedsProto(mktime) \
418 SymI_NeedsProto(_imp___timezone) \
419 SymI_NeedsProto(_imp___tzname) \
420 SymI_NeedsProto(_imp__tzname) \
421 SymI_NeedsProto(_imp___iob) \
422 SymI_NeedsProto(_imp___osver) \
423 SymI_NeedsProto(localtime) \
424 SymI_NeedsProto(gmtime) \
425 SymI_NeedsProto(opendir) \
426 SymI_NeedsProto(readdir) \
427 SymI_NeedsProto(rewinddir) \
428 RTS_MINGW_EXTRA_SYMS \
429 RTS_MINGW_GETTIMEOFDAY_SYM \
430 SymI_NeedsProto(closedir)
433 #if defined(darwin_TARGET_OS) && HAVE_PRINTF_LDBLSTUB
434 #define RTS_DARWIN_ONLY_SYMBOLS \
435 SymI_NeedsProto(asprintf$LDBLStub) \
436 SymI_NeedsProto(err$LDBLStub) \
437 SymI_NeedsProto(errc$LDBLStub) \
438 SymI_NeedsProto(errx$LDBLStub) \
439 SymI_NeedsProto(fprintf$LDBLStub) \
440 SymI_NeedsProto(fscanf$LDBLStub) \
441 SymI_NeedsProto(fwprintf$LDBLStub) \
442 SymI_NeedsProto(fwscanf$LDBLStub) \
443 SymI_NeedsProto(printf$LDBLStub) \
444 SymI_NeedsProto(scanf$LDBLStub) \
445 SymI_NeedsProto(snprintf$LDBLStub) \
446 SymI_NeedsProto(sprintf$LDBLStub) \
447 SymI_NeedsProto(sscanf$LDBLStub) \
448 SymI_NeedsProto(strtold$LDBLStub) \
449 SymI_NeedsProto(swprintf$LDBLStub) \
450 SymI_NeedsProto(swscanf$LDBLStub) \
451 SymI_NeedsProto(syslog$LDBLStub) \
452 SymI_NeedsProto(vasprintf$LDBLStub) \
453 SymI_NeedsProto(verr$LDBLStub) \
454 SymI_NeedsProto(verrc$LDBLStub) \
455 SymI_NeedsProto(verrx$LDBLStub) \
456 SymI_NeedsProto(vfprintf$LDBLStub) \
457 SymI_NeedsProto(vfscanf$LDBLStub) \
458 SymI_NeedsProto(vfwprintf$LDBLStub) \
459 SymI_NeedsProto(vfwscanf$LDBLStub) \
460 SymI_NeedsProto(vprintf$LDBLStub) \
461 SymI_NeedsProto(vscanf$LDBLStub) \
462 SymI_NeedsProto(vsnprintf$LDBLStub) \
463 SymI_NeedsProto(vsprintf$LDBLStub) \
464 SymI_NeedsProto(vsscanf$LDBLStub) \
465 SymI_NeedsProto(vswprintf$LDBLStub) \
466 SymI_NeedsProto(vswscanf$LDBLStub) \
467 SymI_NeedsProto(vsyslog$LDBLStub) \
468 SymI_NeedsProto(vwarn$LDBLStub) \
469 SymI_NeedsProto(vwarnc$LDBLStub) \
470 SymI_NeedsProto(vwarnx$LDBLStub) \
471 SymI_NeedsProto(vwprintf$LDBLStub) \
472 SymI_NeedsProto(vwscanf$LDBLStub) \
473 SymI_NeedsProto(warn$LDBLStub) \
474 SymI_NeedsProto(warnc$LDBLStub) \
475 SymI_NeedsProto(warnx$LDBLStub) \
476 SymI_NeedsProto(wcstold$LDBLStub) \
477 SymI_NeedsProto(wprintf$LDBLStub) \
478 SymI_NeedsProto(wscanf$LDBLStub)
480 #define RTS_DARWIN_ONLY_SYMBOLS
484 # define MAIN_CAP_SYM SymI_HasProto(MainCapability)
486 # define MAIN_CAP_SYM
489 #if !defined(mingw32_HOST_OS)
490 #define RTS_USER_SIGNALS_SYMBOLS \
491 SymI_HasProto(setIOManagerPipe) \
492 SymI_NeedsProto(blockUserSignals) \
493 SymI_NeedsProto(unblockUserSignals)
495 #define RTS_USER_SIGNALS_SYMBOLS \
496 SymI_HasProto(sendIOManagerEvent) \
497 SymI_HasProto(readIOManagerEvent) \
498 SymI_HasProto(getIOManagerEvent) \
499 SymI_HasProto(console_handler)
502 #define RTS_LIBFFI_SYMBOLS \
503 SymE_NeedsProto(ffi_prep_cif) \
504 SymE_NeedsProto(ffi_call) \
505 SymE_NeedsProto(ffi_type_void) \
506 SymE_NeedsProto(ffi_type_float) \
507 SymE_NeedsProto(ffi_type_double) \
508 SymE_NeedsProto(ffi_type_sint64) \
509 SymE_NeedsProto(ffi_type_uint64) \
510 SymE_NeedsProto(ffi_type_sint32) \
511 SymE_NeedsProto(ffi_type_uint32) \
512 SymE_NeedsProto(ffi_type_sint16) \
513 SymE_NeedsProto(ffi_type_uint16) \
514 SymE_NeedsProto(ffi_type_sint8) \
515 SymE_NeedsProto(ffi_type_uint8) \
516 SymE_NeedsProto(ffi_type_pointer)
518 #ifdef TABLES_NEXT_TO_CODE
519 #define RTS_RET_SYMBOLS /* nothing */
521 #define RTS_RET_SYMBOLS \
522 SymI_HasProto(stg_enter_ret) \
523 SymI_HasProto(stg_gc_fun_ret) \
524 SymI_HasProto(stg_ap_v_ret) \
525 SymI_HasProto(stg_ap_f_ret) \
526 SymI_HasProto(stg_ap_d_ret) \
527 SymI_HasProto(stg_ap_l_ret) \
528 SymI_HasProto(stg_ap_n_ret) \
529 SymI_HasProto(stg_ap_p_ret) \
530 SymI_HasProto(stg_ap_pv_ret) \
531 SymI_HasProto(stg_ap_pp_ret) \
532 SymI_HasProto(stg_ap_ppv_ret) \
533 SymI_HasProto(stg_ap_ppp_ret) \
534 SymI_HasProto(stg_ap_pppv_ret) \
535 SymI_HasProto(stg_ap_pppp_ret) \
536 SymI_HasProto(stg_ap_ppppp_ret) \
537 SymI_HasProto(stg_ap_pppppp_ret)
540 /* On Windows, we link libgmp.a statically into libHSrts.dll */
541 #ifdef mingw32_HOST_OS
543 SymI_HasProto(__gmpz_cmp) \
544 SymI_HasProto(__gmpz_cmp_si) \
545 SymI_HasProto(__gmpz_cmp_ui) \
546 SymI_HasProto(__gmpz_get_si) \
547 SymI_HasProto(__gmpz_get_ui)
550 SymE_HasProto(__gmpz_cmp) \
551 SymE_HasProto(__gmpz_cmp_si) \
552 SymE_HasProto(__gmpz_cmp_ui) \
553 SymE_HasProto(__gmpz_get_si) \
554 SymE_HasProto(__gmpz_get_ui)
557 #define RTS_SYMBOLS \
559 SymI_HasProto(StgReturn) \
560 SymI_HasProto(stg_enter_info) \
561 SymI_HasProto(stg_gc_void_info) \
562 SymI_HasProto(__stg_gc_enter_1) \
563 SymI_HasProto(stg_gc_noregs) \
564 SymI_HasProto(stg_gc_unpt_r1_info) \
565 SymI_HasProto(stg_gc_unpt_r1) \
566 SymI_HasProto(stg_gc_unbx_r1_info) \
567 SymI_HasProto(stg_gc_unbx_r1) \
568 SymI_HasProto(stg_gc_f1_info) \
569 SymI_HasProto(stg_gc_f1) \
570 SymI_HasProto(stg_gc_d1_info) \
571 SymI_HasProto(stg_gc_d1) \
572 SymI_HasProto(stg_gc_l1_info) \
573 SymI_HasProto(stg_gc_l1) \
574 SymI_HasProto(__stg_gc_fun) \
575 SymI_HasProto(stg_gc_fun_info) \
576 SymI_HasProto(stg_gc_gen) \
577 SymI_HasProto(stg_gc_gen_info) \
578 SymI_HasProto(stg_gc_gen_hp) \
579 SymI_HasProto(stg_gc_ut) \
580 SymI_HasProto(stg_gen_yield) \
581 SymI_HasProto(stg_yield_noregs) \
582 SymI_HasProto(stg_yield_to_interpreter) \
583 SymI_HasProto(stg_gen_block) \
584 SymI_HasProto(stg_block_noregs) \
585 SymI_HasProto(stg_block_1) \
586 SymI_HasProto(stg_block_takemvar) \
587 SymI_HasProto(stg_block_putmvar) \
589 SymI_HasProto(MallocFailHook) \
590 SymI_HasProto(OnExitHook) \
591 SymI_HasProto(OutOfHeapHook) \
592 SymI_HasProto(StackOverflowHook) \
593 SymI_HasProto(__encodeDouble) \
594 SymI_HasProto(__encodeFloat) \
595 SymI_HasProto(addDLL) \
597 SymI_HasProto(__int_encodeDouble) \
598 SymI_HasProto(__word_encodeDouble) \
599 SymI_HasProto(__2Int_encodeDouble) \
600 SymI_HasProto(__int_encodeFloat) \
601 SymI_HasProto(__word_encodeFloat) \
602 SymI_HasProto(andIntegerzh_fast) \
603 SymI_HasProto(atomicallyzh_fast) \
604 SymI_HasProto(barf) \
605 SymI_HasProto(debugBelch) \
606 SymI_HasProto(errorBelch) \
607 SymI_HasProto(sysErrorBelch) \
608 SymI_HasProto(asyncExceptionsBlockedzh_fast) \
609 SymI_HasProto(blockAsyncExceptionszh_fast) \
610 SymI_HasProto(catchzh_fast) \
611 SymI_HasProto(catchRetryzh_fast) \
612 SymI_HasProto(catchSTMzh_fast) \
613 SymI_HasProto(checkzh_fast) \
614 SymI_HasProto(closure_flags) \
615 SymI_HasProto(cmp_thread) \
616 SymI_HasProto(cmpIntegerzh_fast) \
617 SymI_HasProto(cmpIntegerIntzh_fast) \
618 SymI_HasProto(complementIntegerzh_fast) \
619 SymI_HasProto(createAdjustor) \
620 SymI_HasProto(decodeDoublezh_fast) \
621 SymI_HasProto(decodeDoublezu2Intzh_fast) \
622 SymI_HasProto(decodeFloatzuIntzh_fast) \
623 SymI_HasProto(defaultsHook) \
624 SymI_HasProto(delayzh_fast) \
625 SymI_HasProto(deRefWeakzh_fast) \
626 SymI_HasProto(deRefStablePtrzh_fast) \
627 SymI_HasProto(dirty_MUT_VAR) \
628 SymI_HasProto(divExactIntegerzh_fast) \
629 SymI_HasProto(divModIntegerzh_fast) \
630 SymI_HasProto(forkzh_fast) \
631 SymI_HasProto(forkOnzh_fast) \
632 SymI_HasProto(forkProcess) \
633 SymI_HasProto(forkOS_createThread) \
634 SymI_HasProto(freeHaskellFunctionPtr) \
635 SymI_HasProto(freeStablePtr) \
636 SymI_HasProto(getOrSetTypeableStore) \
637 SymI_HasProto(getOrSetSignalHandlerStore) \
638 SymI_HasProto(gcdIntegerzh_fast) \
639 SymI_HasProto(gcdIntegerIntzh_fast) \
640 SymI_HasProto(gcdIntzh_fast) \
641 SymI_HasProto(genSymZh) \
642 SymI_HasProto(genericRaise) \
643 SymI_HasProto(getProgArgv) \
644 SymI_HasProto(getFullProgArgv) \
645 SymI_HasProto(getStablePtr) \
646 SymI_HasProto(hs_init) \
647 SymI_HasProto(hs_exit) \
648 SymI_HasProto(hs_set_argv) \
649 SymI_HasProto(hs_add_root) \
650 SymI_HasProto(hs_perform_gc) \
651 SymI_HasProto(hs_free_stable_ptr) \
652 SymI_HasProto(hs_free_fun_ptr) \
653 SymI_HasProto(hs_hpc_rootModule) \
654 SymI_HasProto(hs_hpc_module) \
655 SymI_HasProto(initLinker) \
656 SymI_HasProto(unpackClosurezh_fast) \
657 SymI_HasProto(getApStackValzh_fast) \
658 SymI_HasProto(getSparkzh_fast) \
659 SymI_HasProto(int2Integerzh_fast) \
660 SymI_HasProto(integer2Intzh_fast) \
661 SymI_HasProto(integer2Wordzh_fast) \
662 SymI_HasProto(isCurrentThreadBoundzh_fast) \
663 SymI_HasProto(isDoubleDenormalized) \
664 SymI_HasProto(isDoubleInfinite) \
665 SymI_HasProto(isDoubleNaN) \
666 SymI_HasProto(isDoubleNegativeZero) \
667 SymI_HasProto(isEmptyMVarzh_fast) \
668 SymI_HasProto(isFloatDenormalized) \
669 SymI_HasProto(isFloatInfinite) \
670 SymI_HasProto(isFloatNaN) \
671 SymI_HasProto(isFloatNegativeZero) \
672 SymI_HasProto(killThreadzh_fast) \
673 SymI_HasProto(loadObj) \
674 SymI_HasProto(insertStableSymbol) \
675 SymI_HasProto(insertSymbol) \
676 SymI_HasProto(lookupSymbol) \
677 SymI_HasProto(makeStablePtrzh_fast) \
678 SymI_HasProto(minusIntegerzh_fast) \
679 SymI_HasProto(mkApUpd0zh_fast) \
680 SymI_HasProto(myThreadIdzh_fast) \
681 SymI_HasProto(labelThreadzh_fast) \
682 SymI_HasProto(newArrayzh_fast) \
683 SymI_HasProto(newBCOzh_fast) \
684 SymI_HasProto(newByteArrayzh_fast) \
685 SymI_HasProto_redirect(newCAF, newDynCAF) \
686 SymI_HasProto(newMVarzh_fast) \
687 SymI_HasProto(newMutVarzh_fast) \
688 SymI_HasProto(newTVarzh_fast) \
689 SymI_HasProto(noDuplicatezh_fast) \
690 SymI_HasProto(atomicModifyMutVarzh_fast) \
691 SymI_HasProto(newPinnedByteArrayzh_fast) \
692 SymI_HasProto(newAlignedPinnedByteArrayzh_fast) \
693 SymI_HasProto(newSpark) \
694 SymI_HasProto(orIntegerzh_fast) \
695 SymI_HasProto(performGC) \
696 SymI_HasProto(performMajorGC) \
697 SymI_HasProto(plusIntegerzh_fast) \
698 SymI_HasProto(prog_argc) \
699 SymI_HasProto(prog_argv) \
700 SymI_HasProto(putMVarzh_fast) \
701 SymI_HasProto(quotIntegerzh_fast) \
702 SymI_HasProto(quotRemIntegerzh_fast) \
703 SymI_HasProto(raisezh_fast) \
704 SymI_HasProto(raiseIOzh_fast) \
705 SymI_HasProto(readTVarzh_fast) \
706 SymI_HasProto(readTVarIOzh_fast) \
707 SymI_HasProto(remIntegerzh_fast) \
708 SymI_HasProto(resetNonBlockingFd) \
709 SymI_HasProto(resumeThread) \
710 SymI_HasProto(resolveObjs) \
711 SymI_HasProto(retryzh_fast) \
712 SymI_HasProto(rts_apply) \
713 SymI_HasProto(rts_checkSchedStatus) \
714 SymI_HasProto(rts_eval) \
715 SymI_HasProto(rts_evalIO) \
716 SymI_HasProto(rts_evalLazyIO) \
717 SymI_HasProto(rts_evalStableIO) \
718 SymI_HasProto(rts_eval_) \
719 SymI_HasProto(rts_getBool) \
720 SymI_HasProto(rts_getChar) \
721 SymI_HasProto(rts_getDouble) \
722 SymI_HasProto(rts_getFloat) \
723 SymI_HasProto(rts_getInt) \
724 SymI_HasProto(rts_getInt8) \
725 SymI_HasProto(rts_getInt16) \
726 SymI_HasProto(rts_getInt32) \
727 SymI_HasProto(rts_getInt64) \
728 SymI_HasProto(rts_getPtr) \
729 SymI_HasProto(rts_getFunPtr) \
730 SymI_HasProto(rts_getStablePtr) \
731 SymI_HasProto(rts_getThreadId) \
732 SymI_HasProto(rts_getWord) \
733 SymI_HasProto(rts_getWord8) \
734 SymI_HasProto(rts_getWord16) \
735 SymI_HasProto(rts_getWord32) \
736 SymI_HasProto(rts_getWord64) \
737 SymI_HasProto(rts_lock) \
738 SymI_HasProto(rts_mkBool) \
739 SymI_HasProto(rts_mkChar) \
740 SymI_HasProto(rts_mkDouble) \
741 SymI_HasProto(rts_mkFloat) \
742 SymI_HasProto(rts_mkInt) \
743 SymI_HasProto(rts_mkInt8) \
744 SymI_HasProto(rts_mkInt16) \
745 SymI_HasProto(rts_mkInt32) \
746 SymI_HasProto(rts_mkInt64) \
747 SymI_HasProto(rts_mkPtr) \
748 SymI_HasProto(rts_mkFunPtr) \
749 SymI_HasProto(rts_mkStablePtr) \
750 SymI_HasProto(rts_mkString) \
751 SymI_HasProto(rts_mkWord) \
752 SymI_HasProto(rts_mkWord8) \
753 SymI_HasProto(rts_mkWord16) \
754 SymI_HasProto(rts_mkWord32) \
755 SymI_HasProto(rts_mkWord64) \
756 SymI_HasProto(rts_unlock) \
757 SymI_HasProto(rtsSupportsBoundThreads) \
758 SymI_HasProto(__hscore_get_saved_termios) \
759 SymI_HasProto(__hscore_set_saved_termios) \
760 SymI_HasProto(setProgArgv) \
761 SymI_HasProto(startupHaskell) \
762 SymI_HasProto(shutdownHaskell) \
763 SymI_HasProto(shutdownHaskellAndExit) \
764 SymI_HasProto(stable_ptr_table) \
765 SymI_HasProto(stackOverflow) \
766 SymI_HasProto(stg_CAF_BLACKHOLE_info) \
767 SymI_HasProto(__stg_EAGER_BLACKHOLE_info) \
768 SymI_HasProto(awakenBlockedQueue) \
769 SymI_HasProto(startTimer) \
770 SymI_HasProto(stg_CHARLIKE_closure) \
771 SymI_HasProto(stg_MVAR_CLEAN_info) \
772 SymI_HasProto(stg_MVAR_DIRTY_info) \
773 SymI_HasProto(stg_IND_STATIC_info) \
774 SymI_HasProto(stg_INTLIKE_closure) \
775 SymI_HasProto(stg_MUT_ARR_PTRS_DIRTY_info) \
776 SymI_HasProto(stg_MUT_ARR_PTRS_FROZEN_info) \
777 SymI_HasProto(stg_MUT_ARR_PTRS_FROZEN0_info) \
778 SymI_HasProto(stg_WEAK_info) \
779 SymI_HasProto(stg_ap_v_info) \
780 SymI_HasProto(stg_ap_f_info) \
781 SymI_HasProto(stg_ap_d_info) \
782 SymI_HasProto(stg_ap_l_info) \
783 SymI_HasProto(stg_ap_n_info) \
784 SymI_HasProto(stg_ap_p_info) \
785 SymI_HasProto(stg_ap_pv_info) \
786 SymI_HasProto(stg_ap_pp_info) \
787 SymI_HasProto(stg_ap_ppv_info) \
788 SymI_HasProto(stg_ap_ppp_info) \
789 SymI_HasProto(stg_ap_pppv_info) \
790 SymI_HasProto(stg_ap_pppp_info) \
791 SymI_HasProto(stg_ap_ppppp_info) \
792 SymI_HasProto(stg_ap_pppppp_info) \
793 SymI_HasProto(stg_ap_0_fast) \
794 SymI_HasProto(stg_ap_v_fast) \
795 SymI_HasProto(stg_ap_f_fast) \
796 SymI_HasProto(stg_ap_d_fast) \
797 SymI_HasProto(stg_ap_l_fast) \
798 SymI_HasProto(stg_ap_n_fast) \
799 SymI_HasProto(stg_ap_p_fast) \
800 SymI_HasProto(stg_ap_pv_fast) \
801 SymI_HasProto(stg_ap_pp_fast) \
802 SymI_HasProto(stg_ap_ppv_fast) \
803 SymI_HasProto(stg_ap_ppp_fast) \
804 SymI_HasProto(stg_ap_pppv_fast) \
805 SymI_HasProto(stg_ap_pppp_fast) \
806 SymI_HasProto(stg_ap_ppppp_fast) \
807 SymI_HasProto(stg_ap_pppppp_fast) \
808 SymI_HasProto(stg_ap_1_upd_info) \
809 SymI_HasProto(stg_ap_2_upd_info) \
810 SymI_HasProto(stg_ap_3_upd_info) \
811 SymI_HasProto(stg_ap_4_upd_info) \
812 SymI_HasProto(stg_ap_5_upd_info) \
813 SymI_HasProto(stg_ap_6_upd_info) \
814 SymI_HasProto(stg_ap_7_upd_info) \
815 SymI_HasProto(stg_exit) \
816 SymI_HasProto(stg_sel_0_upd_info) \
817 SymI_HasProto(stg_sel_10_upd_info) \
818 SymI_HasProto(stg_sel_11_upd_info) \
819 SymI_HasProto(stg_sel_12_upd_info) \
820 SymI_HasProto(stg_sel_13_upd_info) \
821 SymI_HasProto(stg_sel_14_upd_info) \
822 SymI_HasProto(stg_sel_15_upd_info) \
823 SymI_HasProto(stg_sel_1_upd_info) \
824 SymI_HasProto(stg_sel_2_upd_info) \
825 SymI_HasProto(stg_sel_3_upd_info) \
826 SymI_HasProto(stg_sel_4_upd_info) \
827 SymI_HasProto(stg_sel_5_upd_info) \
828 SymI_HasProto(stg_sel_6_upd_info) \
829 SymI_HasProto(stg_sel_7_upd_info) \
830 SymI_HasProto(stg_sel_8_upd_info) \
831 SymI_HasProto(stg_sel_9_upd_info) \
832 SymI_HasProto(stg_upd_frame_info) \
833 SymI_HasProto(suspendThread) \
834 SymI_HasProto(takeMVarzh_fast) \
835 SymI_HasProto(threadStatuszh_fast) \
836 SymI_HasProto(timesIntegerzh_fast) \
837 SymI_HasProto(tryPutMVarzh_fast) \
838 SymI_HasProto(tryTakeMVarzh_fast) \
839 SymI_HasProto(unblockAsyncExceptionszh_fast) \
840 SymI_HasProto(unloadObj) \
841 SymI_HasProto(unsafeThawArrayzh_fast) \
842 SymI_HasProto(waitReadzh_fast) \
843 SymI_HasProto(waitWritezh_fast) \
844 SymI_HasProto(word2Integerzh_fast) \
845 SymI_HasProto(writeTVarzh_fast) \
846 SymI_HasProto(xorIntegerzh_fast) \
847 SymI_HasProto(yieldzh_fast) \
848 SymI_NeedsProto(stg_interp_constr_entry) \
849 SymI_HasProto(allocateExec) \
850 SymI_HasProto(freeExec) \
851 SymI_HasProto(getAllocations) \
852 SymI_HasProto(revertCAFs) \
853 SymI_HasProto(RtsFlags) \
854 SymI_NeedsProto(rts_breakpoint_io_action) \
855 SymI_NeedsProto(rts_stop_next_breakpoint) \
856 SymI_NeedsProto(rts_stop_on_exception) \
857 SymI_HasProto(stopTimer) \
858 SymI_HasProto(n_capabilities) \
859 SymI_HasProto(traceCcszh_fast) \
860 RTS_USER_SIGNALS_SYMBOLS
862 #ifdef SUPPORT_LONG_LONGS
863 #define RTS_LONG_LONG_SYMS \
864 SymI_HasProto(int64ToIntegerzh_fast) \
865 SymI_HasProto(word64ToIntegerzh_fast)
867 #define RTS_LONG_LONG_SYMS /* nothing */
870 // 64-bit support functions in libgcc.a
871 #if defined(__GNUC__) && SIZEOF_VOID_P <= 4
872 #define RTS_LIBGCC_SYMBOLS \
873 SymI_NeedsProto(__divdi3) \
874 SymI_NeedsProto(__udivdi3) \
875 SymI_NeedsProto(__moddi3) \
876 SymI_NeedsProto(__umoddi3) \
877 SymI_NeedsProto(__muldi3) \
878 SymI_NeedsProto(__ashldi3) \
879 SymI_NeedsProto(__ashrdi3) \
880 SymI_NeedsProto(__lshrdi3) \
881 SymI_NeedsProto(__eprintf)
882 #elif defined(ia64_HOST_ARCH)
883 #define RTS_LIBGCC_SYMBOLS \
884 SymI_NeedsProto(__divdi3) \
885 SymI_NeedsProto(__udivdi3) \
886 SymI_NeedsProto(__moddi3) \
887 SymI_NeedsProto(__umoddi3) \
888 SymI_NeedsProto(__divsf3) \
889 SymI_NeedsProto(__divdf3)
891 #define RTS_LIBGCC_SYMBOLS
894 #if defined(darwin_HOST_OS) && defined(powerpc_HOST_ARCH)
895 // Symbols that don't have a leading underscore
896 // on Mac OS X. They have to receive special treatment,
897 // see machoInitSymbolsWithoutUnderscore()
898 #define RTS_MACHO_NOUNDERLINE_SYMBOLS \
899 SymI_NeedsProto(saveFP) \
900 SymI_NeedsProto(restFP)
903 /* entirely bogus claims about types of these symbols */
904 #define SymI_NeedsProto(vvv) extern void vvv(void);
905 #if defined(__PIC__) && defined(mingw32_TARGET_OS)
906 #define SymE_HasProto(vvv) SymE_HasProto(vvv);
907 #define SymE_NeedsProto(vvv) extern void _imp__ ## vvv (void);
909 #define SymE_NeedsProto(vvv) SymI_NeedsProto(vvv);
910 #define SymE_HasProto(vvv) SymI_HasProto(vvv)
912 #define SymI_HasProto(vvv) /**/
913 #define SymI_HasProto_redirect(vvv,xxx) /**/
917 RTS_POSIX_ONLY_SYMBOLS
918 RTS_MINGW_ONLY_SYMBOLS
919 RTS_CYGWIN_ONLY_SYMBOLS
920 RTS_DARWIN_ONLY_SYMBOLS
923 #undef SymI_NeedsProto
925 #undef SymI_HasProto_redirect
927 #undef SymE_NeedsProto
929 #ifdef LEADING_UNDERSCORE
930 #define MAYBE_LEADING_UNDERSCORE_STR(s) ("_" s)
932 #define MAYBE_LEADING_UNDERSCORE_STR(s) (s)
935 #define SymI_HasProto(vvv) { MAYBE_LEADING_UNDERSCORE_STR(#vvv), \
937 #define SymE_HasProto(vvv) { MAYBE_LEADING_UNDERSCORE_STR(#vvv), \
938 (void*)DLL_IMPORT_DATA_REF(vvv) },
940 #define SymI_NeedsProto(vvv) SymI_HasProto(vvv)
941 #define SymE_NeedsProto(vvv) SymE_HasProto(vvv)
943 // SymI_HasProto_redirect allows us to redirect references to one symbol to
944 // another symbol. See newCAF/newDynCAF for an example.
945 #define SymI_HasProto_redirect(vvv,xxx) \
946 { MAYBE_LEADING_UNDERSCORE_STR(#vvv), \
949 static RtsSymbolVal rtsSyms[] = {
953 RTS_POSIX_ONLY_SYMBOLS
954 RTS_MINGW_ONLY_SYMBOLS
955 RTS_CYGWIN_ONLY_SYMBOLS
956 RTS_DARWIN_ONLY_SYMBOLS
959 #if defined(darwin_HOST_OS) && defined(i386_HOST_ARCH)
960 // dyld stub code contains references to this,
961 // but it should never be called because we treat
962 // lazy pointers as nonlazy.
963 { "dyld_stub_binding_helper", (void*)0xDEADBEEF },
965 { 0, 0 } /* sentinel */
970 /* -----------------------------------------------------------------------------
971 * Insert symbols into hash tables, checking for duplicates.
974 static void ghciInsertStrHashTable ( char* obj_name,
980 if (lookupHashTable(table, (StgWord)key) == NULL)
982 insertStrHashTable(table, (StgWord)key, data);
987 "GHCi runtime linker: fatal error: I found a duplicate definition for symbol\n"
989 "whilst processing object file\n"
991 "This could be caused by:\n"
992 " * Loading two different object files which export the same symbol\n"
993 " * Specifying the same object file twice on the GHCi command line\n"
994 " * An incorrect `package.conf' entry, causing some object to be\n"
996 "GHCi cannot safely continue in this situation. Exiting now. Sorry.\n"
1003 /* -----------------------------------------------------------------------------
1004 * initialize the object linker
1008 static int linker_init_done = 0 ;
1010 #if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
1011 static void *dl_prog_handle;
1019 /* Make initLinker idempotent, so we can call it
1020 before evey relevant operation; that means we
1021 don't need to initialise the linker separately */
1022 if (linker_init_done == 1) { return; } else {
1023 linker_init_done = 1;
1026 stablehash = allocStrHashTable();
1027 symhash = allocStrHashTable();
1029 /* populate the symbol table with stuff from the RTS */
1030 for (sym = rtsSyms; sym->lbl != NULL; sym++) {
1031 ghciInsertStrHashTable("(GHCi built-in symbols)",
1032 symhash, sym->lbl, sym->addr);
1034 # if defined(OBJFORMAT_MACHO) && defined(powerpc_HOST_ARCH)
1035 machoInitSymbolsWithoutUnderscore();
1038 # if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
1039 # if defined(RTLD_DEFAULT)
1040 dl_prog_handle = RTLD_DEFAULT;
1042 dl_prog_handle = dlopen(NULL, RTLD_LAZY);
1043 # endif /* RTLD_DEFAULT */
1046 #if defined(x86_64_HOST_ARCH)
1047 if (RtsFlags.MiscFlags.linkerMemBase != 0) {
1048 // User-override for mmap_32bit_base
1049 mmap_32bit_base = (void*)RtsFlags.MiscFlags.linkerMemBase;
1053 #if defined(mingw32_HOST_OS)
1055 * These two libraries cause problems when added to the static link,
1056 * but are necessary for resolving symbols in GHCi, hence we load
1057 * them manually here.
1064 /* -----------------------------------------------------------------------------
1065 * Loading DLL or .so dynamic libraries
1066 * -----------------------------------------------------------------------------
1068 * Add a DLL from which symbols may be found. In the ELF case, just
1069 * do RTLD_GLOBAL-style add, so no further messing around needs to
1070 * happen in order that symbols in the loaded .so are findable --
1071 * lookupSymbol() will subsequently see them by dlsym on the program's
1072 * dl-handle. Returns NULL if success, otherwise ptr to an err msg.
1074 * In the PEi386 case, open the DLLs and put handles to them in a
1075 * linked list. When looking for a symbol, try all handles in the
1076 * list. This means that we need to load even DLLs that are guaranteed
1077 * to be in the ghc.exe image already, just so we can get a handle
1078 * to give to loadSymbol, so that we can find the symbols. For such
1079 * libraries, the LoadLibrary call should be a no-op except for returning
1084 #if defined(OBJFORMAT_PEi386)
1085 /* A record for storing handles into DLLs. */
1090 struct _OpenedDLL* next;
1095 /* A list thereof. */
1096 static OpenedDLL* opened_dlls = NULL;
1100 addDLL( char *dll_name )
1102 # if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
1103 /* ------------------- ELF DLL loader ------------------- */
1109 // omitted: RTLD_NOW
1110 // see http://www.haskell.org/pipermail/cvs-ghc/2007-September/038570.html
1111 hdl= dlopen(dll_name, RTLD_LAZY | RTLD_GLOBAL);
1114 /* dlopen failed; return a ptr to the error msg. */
1116 if (errmsg == NULL) errmsg = "addDLL: unknown error";
1123 # elif defined(OBJFORMAT_PEi386)
1124 /* ------------------- Win32 DLL loader ------------------- */
1132 /* debugBelch("\naddDLL; dll_name = `%s'\n", dll_name); */
1134 /* See if we've already got it, and ignore if so. */
1135 for (o_dll = opened_dlls; o_dll != NULL; o_dll = o_dll->next) {
1136 if (0 == strcmp(o_dll->name, dll_name))
1140 /* The file name has no suffix (yet) so that we can try
1141 both foo.dll and foo.drv
1143 The documentation for LoadLibrary says:
1144 If no file name extension is specified in the lpFileName
1145 parameter, the default library extension .dll is
1146 appended. However, the file name string can include a trailing
1147 point character (.) to indicate that the module name has no
1150 buf = stgMallocBytes(strlen(dll_name) + 10, "addDLL");
1151 sprintf(buf, "%s.DLL", dll_name);
1152 instance = LoadLibrary(buf);
1153 if (instance == NULL) {
1154 if (GetLastError() != ERROR_MOD_NOT_FOUND) goto error;
1155 // KAA: allow loading of drivers (like winspool.drv)
1156 sprintf(buf, "%s.DRV", dll_name);
1157 instance = LoadLibrary(buf);
1158 if (instance == NULL) {
1159 if (GetLastError() != ERROR_MOD_NOT_FOUND) goto error;
1160 // #1883: allow loading of unix-style libfoo.dll DLLs
1161 sprintf(buf, "lib%s.DLL", dll_name);
1162 instance = LoadLibrary(buf);
1163 if (instance == NULL) {
1170 /* Add this DLL to the list of DLLs in which to search for symbols. */
1171 o_dll = stgMallocBytes( sizeof(OpenedDLL), "addDLL" );
1172 o_dll->name = stgMallocBytes(1+strlen(dll_name), "addDLL");
1173 strcpy(o_dll->name, dll_name);
1174 o_dll->instance = instance;
1175 o_dll->next = opened_dlls;
1176 opened_dlls = o_dll;
1182 sysErrorBelch(dll_name);
1184 /* LoadLibrary failed; return a ptr to the error msg. */
1185 return "addDLL: could not load DLL";
1188 barf("addDLL: not implemented on this platform");
1192 /* -----------------------------------------------------------------------------
1193 * insert a stable symbol in the hash table
1197 insertStableSymbol(char* obj_name, char* key, StgPtr p)
1199 ghciInsertStrHashTable(obj_name, stablehash, key, getStablePtr(p));
1203 /* -----------------------------------------------------------------------------
1204 * insert a symbol in the hash table
1207 insertSymbol(char* obj_name, char* key, void* data)
1209 ghciInsertStrHashTable(obj_name, symhash, key, data);
1212 /* -----------------------------------------------------------------------------
1213 * lookup a symbol in the hash table
1216 lookupSymbol( char *lbl )
1220 ASSERT(symhash != NULL);
1221 val = lookupStrHashTable(symhash, lbl);
1224 # if defined(OBJFORMAT_ELF)
1225 return dlsym(dl_prog_handle, lbl);
1226 # elif defined(OBJFORMAT_MACHO)
1228 /* On OS X 10.3 and later, we use dlsym instead of the old legacy
1231 HACK: On OS X, global symbols are prefixed with an underscore.
1232 However, dlsym wants us to omit the leading underscore from the
1233 symbol name. For now, we simply strip it off here (and ONLY
1236 ASSERT(lbl[0] == '_');
1237 return dlsym(dl_prog_handle, lbl+1);
1239 if(NSIsSymbolNameDefined(lbl)) {
1240 NSSymbol symbol = NSLookupAndBindSymbol(lbl);
1241 return NSAddressOfSymbol(symbol);
1245 # endif /* HAVE_DLFCN_H */
1246 # elif defined(OBJFORMAT_PEi386)
1249 sym = lookupSymbolInDLLs(lbl);
1250 if (sym != NULL) { return sym; };
1252 // Also try looking up the symbol without the @N suffix. Some
1253 // DLLs have the suffixes on their symbols, some don't.
1254 zapTrailingAtSign ( lbl );
1255 sym = lookupSymbolInDLLs(lbl);
1256 if (sym != NULL) { return sym; };
1268 /* -----------------------------------------------------------------------------
1269 * Debugging aid: look in GHCi's object symbol tables for symbols
1270 * within DELTA bytes of the specified address, and show their names.
1273 void ghci_enquire ( char* addr );
1275 void ghci_enquire ( char* addr )
1280 const int DELTA = 64;
1285 for (oc = objects; oc; oc = oc->next) {
1286 for (i = 0; i < oc->n_symbols; i++) {
1287 sym = oc->symbols[i];
1288 if (sym == NULL) continue;
1291 a = lookupStrHashTable(symhash, sym);
1294 // debugBelch("ghci_enquire: can't find %s\n", sym);
1296 else if (addr-DELTA <= a && a <= addr+DELTA) {
1297 debugBelch("%p + %3d == `%s'\n", addr, (int)(a - addr), sym);
1304 #ifdef ia64_HOST_ARCH
1305 static unsigned int PLTSize(void);
1309 #define ROUND_UP(x,size) ((x + size - 1) & ~(size - 1))
1312 mmapForLinker (size_t bytes, nat flags, int fd)
1314 void *map_addr = NULL;
1317 static nat fixed = 0;
1319 pagesize = getpagesize();
1320 size = ROUND_UP(bytes, pagesize);
1322 #if defined(x86_64_HOST_ARCH)
1325 if (mmap_32bit_base != 0) {
1326 map_addr = mmap_32bit_base;
1330 result = mmap(map_addr, size, PROT_EXEC|PROT_READ|PROT_WRITE,
1331 MAP_PRIVATE|TRY_MAP_32BIT|fixed|flags, fd, 0);
1333 if (result == MAP_FAILED) {
1334 sysErrorBelch("mmap %lu bytes at %p",(lnat)size,map_addr);
1335 errorBelch("Try specifying an address with +RTS -xm<addr> -RTS");
1336 stg_exit(EXIT_FAILURE);
1339 #if defined(x86_64_HOST_ARCH)
1340 if (mmap_32bit_base != 0) {
1341 if (result == map_addr) {
1342 mmap_32bit_base = map_addr + size;
1344 if ((W_)result > 0x80000000) {
1345 // oops, we were given memory over 2Gb
1346 #if defined(freebsd_HOST_OS)
1347 // Some platforms require MAP_FIXED. This is normally
1348 // a bad idea, because MAP_FIXED will overwrite
1349 // existing mappings.
1350 munmap(result,size);
1354 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);
1357 // hmm, we were given memory somewhere else, but it's
1358 // still under 2Gb so we can use it. Next time, ask
1359 // for memory right after the place we just got some
1360 mmap_32bit_base = (void*)result + size;
1364 if ((W_)result > 0x80000000) {
1365 // oops, we were given memory over 2Gb
1366 // ... try allocating memory somewhere else?;
1367 debugTrace(DEBUG_linker,"MAP_32BIT didn't work; gave us %lu bytes at 0x%p", bytes, result);
1368 munmap(result, size);
1370 // Set a base address and try again... (guess: 1Gb)
1371 mmap_32bit_base = (void*)0x40000000;
1381 /* -----------------------------------------------------------------------------
1382 * Load an obj (populate the global symbol table, but don't resolve yet)
1384 * Returns: 1 if ok, 0 on error.
1387 loadObj( char *path )
1399 /* debugBelch("loadObj %s\n", path ); */
1401 /* Check that we haven't already loaded this object.
1402 Ignore requests to load multiple times */
1406 for (o = objects; o; o = o->next) {
1407 if (0 == strcmp(o->fileName, path)) {
1409 break; /* don't need to search further */
1413 IF_DEBUG(linker, debugBelch(
1414 "GHCi runtime linker: warning: looks like you're trying to load the\n"
1415 "same object file twice:\n"
1417 "GHCi will ignore this, but be warned.\n"
1419 return 1; /* success */
1423 oc = stgMallocBytes(sizeof(ObjectCode), "loadObj(oc)");
1425 # if defined(OBJFORMAT_ELF)
1426 oc->formatName = "ELF";
1427 # elif defined(OBJFORMAT_PEi386)
1428 oc->formatName = "PEi386";
1429 # elif defined(OBJFORMAT_MACHO)
1430 oc->formatName = "Mach-O";
1433 barf("loadObj: not implemented on this platform");
1436 r = stat(path, &st);
1437 if (r == -1) { return 0; }
1439 /* sigh, strdup() isn't a POSIX function, so do it the long way */
1440 oc->fileName = stgMallocBytes( strlen(path)+1, "loadObj" );
1441 strcpy(oc->fileName, path);
1443 oc->fileSize = st.st_size;
1445 oc->sections = NULL;
1446 oc->proddables = NULL;
1448 /* chain it onto the list of objects */
1453 /* On many architectures malloc'd memory isn't executable, so we need to use mmap. */
1455 #if defined(openbsd_HOST_OS)
1456 fd = open(path, O_RDONLY, S_IRUSR);
1458 fd = open(path, O_RDONLY);
1461 barf("loadObj: can't open `%s'", path);
1463 #ifdef ia64_HOST_ARCH
1464 /* The PLT needs to be right before the object */
1467 pagesize = getpagesize();
1468 n = ROUND_UP(PLTSize(), pagesize);
1469 oc->plt = mmap(NULL, n, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
1470 if (oc->plt == MAP_FAILED)
1471 barf("loadObj: can't allocate PLT");
1474 map_addr = oc->plt + n;
1476 n = ROUND_UP(oc->fileSize, pagesize);
1477 oc->image = mmap(map_addr, n, PROT_EXEC|PROT_READ|PROT_WRITE,
1478 MAP_PRIVATE|TRY_MAP_32BIT, fd, 0);
1479 if (oc->image == MAP_FAILED)
1480 barf("loadObj: can't map `%s'", path);
1483 oc->image = mmapForLinker(oc->fileSize, 0, fd);
1488 #else /* !USE_MMAP */
1489 /* load the image into memory */
1490 f = fopen(path, "rb");
1492 barf("loadObj: can't read `%s'", path);
1494 # if defined(mingw32_HOST_OS)
1495 // TODO: We would like to use allocateExec here, but allocateExec
1496 // cannot currently allocate blocks large enough.
1497 oc->image = VirtualAlloc(NULL, oc->fileSize, MEM_RESERVE | MEM_COMMIT,
1498 PAGE_EXECUTE_READWRITE);
1499 # elif defined(darwin_HOST_OS)
1500 // In a Mach-O .o file, all sections can and will be misaligned
1501 // if the total size of the headers is not a multiple of the
1502 // desired alignment. This is fine for .o files that only serve
1503 // as input for the static linker, but it's not fine for us,
1504 // as SSE (used by gcc for floating point) and Altivec require
1505 // 16-byte alignment.
1506 // We calculate the correct alignment from the header before
1507 // reading the file, and then we misalign oc->image on purpose so
1508 // that the actual sections end up aligned again.
1509 oc->misalignment = machoGetMisalignment(f);
1510 oc->image = stgMallocBytes(oc->fileSize + oc->misalignment, "loadObj(image)");
1511 oc->image += oc->misalignment;
1513 oc->image = stgMallocBytes(oc->fileSize, "loadObj(image)");
1518 n = fread ( oc->image, 1, oc->fileSize, f );
1519 if (n != oc->fileSize)
1520 barf("loadObj: error whilst reading `%s'", path);
1523 #endif /* USE_MMAP */
1525 # if defined(OBJFORMAT_MACHO) && (defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH))
1526 r = ocAllocateSymbolExtras_MachO ( oc );
1527 if (!r) { return r; }
1528 # elif defined(OBJFORMAT_ELF) && (defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH))
1529 r = ocAllocateSymbolExtras_ELF ( oc );
1530 if (!r) { return r; }
1533 /* verify the in-memory image */
1534 # if defined(OBJFORMAT_ELF)
1535 r = ocVerifyImage_ELF ( oc );
1536 # elif defined(OBJFORMAT_PEi386)
1537 r = ocVerifyImage_PEi386 ( oc );
1538 # elif defined(OBJFORMAT_MACHO)
1539 r = ocVerifyImage_MachO ( oc );
1541 barf("loadObj: no verify method");
1543 if (!r) { return r; }
1545 /* build the symbol list for this image */
1546 # if defined(OBJFORMAT_ELF)
1547 r = ocGetNames_ELF ( oc );
1548 # elif defined(OBJFORMAT_PEi386)
1549 r = ocGetNames_PEi386 ( oc );
1550 # elif defined(OBJFORMAT_MACHO)
1551 r = ocGetNames_MachO ( oc );
1553 barf("loadObj: no getNames method");
1555 if (!r) { return r; }
1557 /* loaded, but not resolved yet */
1558 oc->status = OBJECT_LOADED;
1563 /* -----------------------------------------------------------------------------
1564 * resolve all the currently unlinked objects in memory
1566 * Returns: 1 if ok, 0 on error.
1576 for (oc = objects; oc; oc = oc->next) {
1577 if (oc->status != OBJECT_RESOLVED) {
1578 # if defined(OBJFORMAT_ELF)
1579 r = ocResolve_ELF ( oc );
1580 # elif defined(OBJFORMAT_PEi386)
1581 r = ocResolve_PEi386 ( oc );
1582 # elif defined(OBJFORMAT_MACHO)
1583 r = ocResolve_MachO ( oc );
1585 barf("resolveObjs: not implemented on this platform");
1587 if (!r) { return r; }
1588 oc->status = OBJECT_RESOLVED;
1594 /* -----------------------------------------------------------------------------
1595 * delete an object from the pool
1598 unloadObj( char *path )
1600 ObjectCode *oc, *prev;
1602 ASSERT(symhash != NULL);
1603 ASSERT(objects != NULL);
1608 for (oc = objects; oc; prev = oc, oc = oc->next) {
1609 if (!strcmp(oc->fileName,path)) {
1611 /* Remove all the mappings for the symbols within this
1616 for (i = 0; i < oc->n_symbols; i++) {
1617 if (oc->symbols[i] != NULL) {
1618 removeStrHashTable(symhash, oc->symbols[i], NULL);
1626 prev->next = oc->next;
1629 // We're going to leave this in place, in case there are
1630 // any pointers from the heap into it:
1631 // #ifdef mingw32_HOST_OS
1632 // VirtualFree(oc->image);
1634 // stgFree(oc->image);
1636 stgFree(oc->fileName);
1637 stgFree(oc->symbols);
1638 stgFree(oc->sections);
1644 errorBelch("unloadObj: can't find `%s' to unload", path);
1648 /* -----------------------------------------------------------------------------
1649 * Sanity checking. For each ObjectCode, maintain a list of address ranges
1650 * which may be prodded during relocation, and abort if we try and write
1651 * outside any of these.
1653 static void addProddableBlock ( ObjectCode* oc, void* start, int size )
1656 = stgMallocBytes(sizeof(ProddableBlock), "addProddableBlock");
1657 /* debugBelch("aPB %p %p %d\n", oc, start, size); */
1661 pb->next = oc->proddables;
1662 oc->proddables = pb;
1665 static void checkProddableBlock ( ObjectCode* oc, void* addr )
1668 for (pb = oc->proddables; pb != NULL; pb = pb->next) {
1669 char* s = (char*)(pb->start);
1670 char* e = s + pb->size - 1;
1671 char* a = (char*)addr;
1672 /* Assumes that the biggest fixup involves a 4-byte write. This
1673 probably needs to be changed to 8 (ie, +7) on 64-bit
1675 if (a >= s && (a+3) <= e) return;
1677 barf("checkProddableBlock: invalid fixup in runtime linker");
1680 /* -----------------------------------------------------------------------------
1681 * Section management.
1683 static void addSection ( ObjectCode* oc, SectionKind kind,
1684 void* start, void* end )
1686 Section* s = stgMallocBytes(sizeof(Section), "addSection");
1690 s->next = oc->sections;
1693 debugBelch("addSection: %p-%p (size %d), kind %d\n",
1694 start, ((char*)end)-1, end - start + 1, kind );
1699 /* --------------------------------------------------------------------------
1701 * This is about allocating a small chunk of memory for every symbol in the
1702 * object file. We make sure that the SymboLExtras are always "in range" of
1703 * limited-range PC-relative instructions on various platforms by allocating
1704 * them right next to the object code itself.
1707 #if defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH)
1710 ocAllocateSymbolExtras
1712 Allocate additional space at the end of the object file image to make room
1713 for jump islands (powerpc, x86_64) and GOT entries (x86_64).
1715 PowerPC relative branch instructions have a 24 bit displacement field.
1716 As PPC code is always 4-byte-aligned, this yields a +-32MB range.
1717 If a particular imported symbol is outside this range, we have to redirect
1718 the jump to a short piece of new code that just loads the 32bit absolute
1719 address and jumps there.
1720 On x86_64, PC-relative jumps and PC-relative accesses to the GOT are limited
1723 This function just allocates space for one SymbolExtra for every
1724 undefined symbol in the object file. The code for the jump islands is
1725 filled in by makeSymbolExtra below.
1728 static int ocAllocateSymbolExtras( ObjectCode* oc, int count, int first )
1735 int misalignment = 0;
1736 #ifdef darwin_HOST_OS
1737 misalignment = oc->misalignment;
1743 // round up to the nearest 4
1744 aligned = (oc->fileSize + 3) & ~3;
1747 pagesize = getpagesize();
1748 n = ROUND_UP( oc->fileSize, pagesize );
1749 m = ROUND_UP( aligned + sizeof (SymbolExtra) * count, pagesize );
1751 /* we try to use spare space at the end of the last page of the
1752 * image for the jump islands, but if there isn't enough space
1753 * then we have to map some (anonymously, remembering MAP_32BIT).
1755 if( m > n ) // we need to allocate more pages
1757 oc->symbol_extras = mmapForLinker(sizeof(SymbolExtra) * count,
1762 oc->symbol_extras = (SymbolExtra *) (oc->image + aligned);
1765 oc->image -= misalignment;
1766 oc->image = stgReallocBytes( oc->image,
1768 aligned + sizeof (SymbolExtra) * count,
1769 "ocAllocateSymbolExtras" );
1770 oc->image += misalignment;
1772 oc->symbol_extras = (SymbolExtra *) (oc->image + aligned);
1773 #endif /* USE_MMAP */
1775 memset( oc->symbol_extras, 0, sizeof (SymbolExtra) * count );
1778 oc->symbol_extras = NULL;
1780 oc->first_symbol_extra = first;
1781 oc->n_symbol_extras = count;
1786 static SymbolExtra* makeSymbolExtra( ObjectCode* oc,
1787 unsigned long symbolNumber,
1788 unsigned long target )
1792 ASSERT( symbolNumber >= oc->first_symbol_extra
1793 && symbolNumber - oc->first_symbol_extra < oc->n_symbol_extras);
1795 extra = &oc->symbol_extras[symbolNumber - oc->first_symbol_extra];
1797 #ifdef powerpc_HOST_ARCH
1798 // lis r12, hi16(target)
1799 extra->jumpIsland.lis_r12 = 0x3d80;
1800 extra->jumpIsland.hi_addr = target >> 16;
1802 // ori r12, r12, lo16(target)
1803 extra->jumpIsland.ori_r12_r12 = 0x618c;
1804 extra->jumpIsland.lo_addr = target & 0xffff;
1807 extra->jumpIsland.mtctr_r12 = 0x7d8903a6;
1810 extra->jumpIsland.bctr = 0x4e800420;
1812 #ifdef x86_64_HOST_ARCH
1814 static uint8_t jmp[] = { 0xFF, 0x25, 0xF2, 0xFF, 0xFF, 0xFF };
1815 extra->addr = target;
1816 memcpy(extra->jumpIsland, jmp, 6);
1824 /* --------------------------------------------------------------------------
1825 * PowerPC specifics (instruction cache flushing)
1826 * ------------------------------------------------------------------------*/
1828 #ifdef powerpc_TARGET_ARCH
1830 ocFlushInstructionCache
1832 Flush the data & instruction caches.
1833 Because the PPC has split data/instruction caches, we have to
1834 do that whenever we modify code at runtime.
1837 static void ocFlushInstructionCache( ObjectCode *oc )
1839 int n = (oc->fileSize + sizeof( SymbolExtra ) * oc->n_symbol_extras + 3) / 4;
1840 unsigned long *p = (unsigned long *) oc->image;
1844 __asm__ volatile ( "dcbf 0,%0\n\t"
1852 __asm__ volatile ( "sync\n\t"
1858 /* --------------------------------------------------------------------------
1859 * PEi386 specifics (Win32 targets)
1860 * ------------------------------------------------------------------------*/
1862 /* The information for this linker comes from
1863 Microsoft Portable Executable
1864 and Common Object File Format Specification
1865 revision 5.1 January 1998
1866 which SimonM says comes from the MS Developer Network CDs.
1868 It can be found there (on older CDs), but can also be found
1871 http://www.microsoft.com/hwdev/hardware/PECOFF.asp
1873 (this is Rev 6.0 from February 1999).
1875 Things move, so if that fails, try searching for it via
1877 http://www.google.com/search?q=PE+COFF+specification
1879 The ultimate reference for the PE format is the Winnt.h
1880 header file that comes with the Platform SDKs; as always,
1881 implementations will drift wrt their documentation.
1883 A good background article on the PE format is Matt Pietrek's
1884 March 1994 article in Microsoft System Journal (MSJ)
1885 (Vol.9, No. 3): "Peering Inside the PE: A Tour of the
1886 Win32 Portable Executable File Format." The info in there
1887 has recently been updated in a two part article in
1888 MSDN magazine, issues Feb and March 2002,
1889 "Inside Windows: An In-Depth Look into the Win32 Portable
1890 Executable File Format"
1892 John Levine's book "Linkers and Loaders" contains useful
1897 #if defined(OBJFORMAT_PEi386)
1901 typedef unsigned char UChar;
1902 typedef unsigned short UInt16;
1903 typedef unsigned int UInt32;
1910 UInt16 NumberOfSections;
1911 UInt32 TimeDateStamp;
1912 UInt32 PointerToSymbolTable;
1913 UInt32 NumberOfSymbols;
1914 UInt16 SizeOfOptionalHeader;
1915 UInt16 Characteristics;
1919 #define sizeof_COFF_header 20
1926 UInt32 VirtualAddress;
1927 UInt32 SizeOfRawData;
1928 UInt32 PointerToRawData;
1929 UInt32 PointerToRelocations;
1930 UInt32 PointerToLinenumbers;
1931 UInt16 NumberOfRelocations;
1932 UInt16 NumberOfLineNumbers;
1933 UInt32 Characteristics;
1937 #define sizeof_COFF_section 40
1944 UInt16 SectionNumber;
1947 UChar NumberOfAuxSymbols;
1951 #define sizeof_COFF_symbol 18
1956 UInt32 VirtualAddress;
1957 UInt32 SymbolTableIndex;
1962 #define sizeof_COFF_reloc 10
1965 /* From PE spec doc, section 3.3.2 */
1966 /* Note use of MYIMAGE_* since IMAGE_* are already defined in
1967 windows.h -- for the same purpose, but I want to know what I'm
1969 #define MYIMAGE_FILE_RELOCS_STRIPPED 0x0001
1970 #define MYIMAGE_FILE_EXECUTABLE_IMAGE 0x0002
1971 #define MYIMAGE_FILE_DLL 0x2000
1972 #define MYIMAGE_FILE_SYSTEM 0x1000
1973 #define MYIMAGE_FILE_BYTES_REVERSED_HI 0x8000
1974 #define MYIMAGE_FILE_BYTES_REVERSED_LO 0x0080
1975 #define MYIMAGE_FILE_32BIT_MACHINE 0x0100
1977 /* From PE spec doc, section 5.4.2 and 5.4.4 */
1978 #define MYIMAGE_SYM_CLASS_EXTERNAL 2
1979 #define MYIMAGE_SYM_CLASS_STATIC 3
1980 #define MYIMAGE_SYM_UNDEFINED 0
1982 /* From PE spec doc, section 4.1 */
1983 #define MYIMAGE_SCN_CNT_CODE 0x00000020
1984 #define MYIMAGE_SCN_CNT_INITIALIZED_DATA 0x00000040
1985 #define MYIMAGE_SCN_LNK_NRELOC_OVFL 0x01000000
1987 /* From PE spec doc, section 5.2.1 */
1988 #define MYIMAGE_REL_I386_DIR32 0x0006
1989 #define MYIMAGE_REL_I386_REL32 0x0014
1992 /* We use myindex to calculate array addresses, rather than
1993 simply doing the normal subscript thing. That's because
1994 some of the above structs have sizes which are not
1995 a whole number of words. GCC rounds their sizes up to a
1996 whole number of words, which means that the address calcs
1997 arising from using normal C indexing or pointer arithmetic
1998 are just plain wrong. Sigh.
2001 myindex ( int scale, void* base, int index )
2004 ((UChar*)base) + scale * index;
2009 printName ( UChar* name, UChar* strtab )
2011 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
2012 UInt32 strtab_offset = * (UInt32*)(name+4);
2013 debugBelch("%s", strtab + strtab_offset );
2016 for (i = 0; i < 8; i++) {
2017 if (name[i] == 0) break;
2018 debugBelch("%c", name[i] );
2025 copyName ( UChar* name, UChar* strtab, UChar* dst, int dstSize )
2027 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
2028 UInt32 strtab_offset = * (UInt32*)(name+4);
2029 strncpy ( dst, strtab+strtab_offset, dstSize );
2035 if (name[i] == 0) break;
2045 cstring_from_COFF_symbol_name ( UChar* name, UChar* strtab )
2048 /* If the string is longer than 8 bytes, look in the
2049 string table for it -- this will be correctly zero terminated.
2051 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
2052 UInt32 strtab_offset = * (UInt32*)(name+4);
2053 return ((UChar*)strtab) + strtab_offset;
2055 /* Otherwise, if shorter than 8 bytes, return the original,
2056 which by defn is correctly terminated.
2058 if (name[7]==0) return name;
2059 /* The annoying case: 8 bytes. Copy into a temporary
2060 (which is never freed ...)
2062 newstr = stgMallocBytes(9, "cstring_from_COFF_symbol_name");
2064 strncpy(newstr,name,8);
2070 /* Just compares the short names (first 8 chars) */
2071 static COFF_section *
2072 findPEi386SectionCalled ( ObjectCode* oc, char* name )
2076 = (COFF_header*)(oc->image);
2077 COFF_section* sectab
2079 ((UChar*)(oc->image))
2080 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2082 for (i = 0; i < hdr->NumberOfSections; i++) {
2085 COFF_section* section_i
2087 myindex ( sizeof_COFF_section, sectab, i );
2088 n1 = (UChar*) &(section_i->Name);
2090 if (n1[0]==n2[0] && n1[1]==n2[1] && n1[2]==n2[2] &&
2091 n1[3]==n2[3] && n1[4]==n2[4] && n1[5]==n2[5] &&
2092 n1[6]==n2[6] && n1[7]==n2[7])
2101 zapTrailingAtSign ( UChar* sym )
2103 # define my_isdigit(c) ((c) >= '0' && (c) <= '9')
2105 if (sym[0] == 0) return;
2107 while (sym[i] != 0) i++;
2110 while (j > 0 && my_isdigit(sym[j])) j--;
2111 if (j > 0 && sym[j] == '@' && j != i) sym[j] = 0;
2116 lookupSymbolInDLLs ( UChar *lbl )
2121 for (o_dll = opened_dlls; o_dll != NULL; o_dll = o_dll->next) {
2122 /* debugBelch("look in %s for %s\n", o_dll->name, lbl); */
2124 if (lbl[0] == '_') {
2125 /* HACK: if the name has an initial underscore, try stripping
2126 it off & look that up first. I've yet to verify whether there's
2127 a Rule that governs whether an initial '_' *should always* be
2128 stripped off when mapping from import lib name to the DLL name.
2130 sym = GetProcAddress(o_dll->instance, (lbl+1));
2132 /*debugBelch("found %s in %s\n", lbl+1,o_dll->name);*/
2136 sym = GetProcAddress(o_dll->instance, lbl);
2138 /*debugBelch("found %s in %s\n", lbl,o_dll->name);*/
2147 ocVerifyImage_PEi386 ( ObjectCode* oc )
2152 COFF_section* sectab;
2153 COFF_symbol* symtab;
2155 /* debugBelch("\nLOADING %s\n", oc->fileName); */
2156 hdr = (COFF_header*)(oc->image);
2157 sectab = (COFF_section*) (
2158 ((UChar*)(oc->image))
2159 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2161 symtab = (COFF_symbol*) (
2162 ((UChar*)(oc->image))
2163 + hdr->PointerToSymbolTable
2165 strtab = ((UChar*)symtab)
2166 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
2168 if (hdr->Machine != 0x14c) {
2169 errorBelch("%s: Not x86 PEi386", oc->fileName);
2172 if (hdr->SizeOfOptionalHeader != 0) {
2173 errorBelch("%s: PEi386 with nonempty optional header", oc->fileName);
2176 if ( /* (hdr->Characteristics & MYIMAGE_FILE_RELOCS_STRIPPED) || */
2177 (hdr->Characteristics & MYIMAGE_FILE_EXECUTABLE_IMAGE) ||
2178 (hdr->Characteristics & MYIMAGE_FILE_DLL) ||
2179 (hdr->Characteristics & MYIMAGE_FILE_SYSTEM) ) {
2180 errorBelch("%s: Not a PEi386 object file", oc->fileName);
2183 if ( (hdr->Characteristics & MYIMAGE_FILE_BYTES_REVERSED_HI)
2184 /* || !(hdr->Characteristics & MYIMAGE_FILE_32BIT_MACHINE) */ ) {
2185 errorBelch("%s: Invalid PEi386 word size or endiannness: %d",
2187 (int)(hdr->Characteristics));
2190 /* If the string table size is way crazy, this might indicate that
2191 there are more than 64k relocations, despite claims to the
2192 contrary. Hence this test. */
2193 /* debugBelch("strtab size %d\n", * (UInt32*)strtab); */
2195 if ( (*(UInt32*)strtab) > 600000 ) {
2196 /* Note that 600k has no special significance other than being
2197 big enough to handle the almost-2MB-sized lumps that
2198 constitute HSwin32*.o. */
2199 debugBelch("PEi386 object has suspiciously large string table; > 64k relocs?");
2204 /* No further verification after this point; only debug printing. */
2206 IF_DEBUG(linker, i=1);
2207 if (i == 0) return 1;
2209 debugBelch( "sectab offset = %d\n", ((UChar*)sectab) - ((UChar*)hdr) );
2210 debugBelch( "symtab offset = %d\n", ((UChar*)symtab) - ((UChar*)hdr) );
2211 debugBelch( "strtab offset = %d\n", ((UChar*)strtab) - ((UChar*)hdr) );
2214 debugBelch( "Machine: 0x%x\n", (UInt32)(hdr->Machine) );
2215 debugBelch( "# sections: %d\n", (UInt32)(hdr->NumberOfSections) );
2216 debugBelch( "time/date: 0x%x\n", (UInt32)(hdr->TimeDateStamp) );
2217 debugBelch( "symtab offset: %d\n", (UInt32)(hdr->PointerToSymbolTable) );
2218 debugBelch( "# symbols: %d\n", (UInt32)(hdr->NumberOfSymbols) );
2219 debugBelch( "sz of opt hdr: %d\n", (UInt32)(hdr->SizeOfOptionalHeader) );
2220 debugBelch( "characteristics: 0x%x\n", (UInt32)(hdr->Characteristics) );
2222 /* Print the section table. */
2224 for (i = 0; i < hdr->NumberOfSections; i++) {
2226 COFF_section* sectab_i
2228 myindex ( sizeof_COFF_section, sectab, i );
2235 printName ( sectab_i->Name, strtab );
2245 sectab_i->VirtualSize,
2246 sectab_i->VirtualAddress,
2247 sectab_i->SizeOfRawData,
2248 sectab_i->PointerToRawData,
2249 sectab_i->NumberOfRelocations,
2250 sectab_i->PointerToRelocations,
2251 sectab_i->PointerToRawData
2253 reltab = (COFF_reloc*) (
2254 ((UChar*)(oc->image)) + sectab_i->PointerToRelocations
2257 if ( sectab_i->Characteristics & MYIMAGE_SCN_LNK_NRELOC_OVFL ) {
2258 /* If the relocation field (a short) has overflowed, the
2259 * real count can be found in the first reloc entry.
2261 * See Section 4.1 (last para) of the PE spec (rev6.0).
2263 COFF_reloc* rel = (COFF_reloc*)
2264 myindex ( sizeof_COFF_reloc, reltab, 0 );
2265 noRelocs = rel->VirtualAddress;
2268 noRelocs = sectab_i->NumberOfRelocations;
2272 for (; j < noRelocs; j++) {
2274 COFF_reloc* rel = (COFF_reloc*)
2275 myindex ( sizeof_COFF_reloc, reltab, j );
2277 " type 0x%-4x vaddr 0x%-8x name `",
2279 rel->VirtualAddress );
2280 sym = (COFF_symbol*)
2281 myindex ( sizeof_COFF_symbol, symtab, rel->SymbolTableIndex );
2282 /* Hmm..mysterious looking offset - what's it for? SOF */
2283 printName ( sym->Name, strtab -10 );
2290 debugBelch("string table has size 0x%x\n", * (UInt32*)strtab );
2291 debugBelch("---START of string table---\n");
2292 for (i = 4; i < *(Int32*)strtab; i++) {
2294 debugBelch("\n"); else
2295 debugBelch("%c", strtab[i] );
2297 debugBelch("--- END of string table---\n");
2302 COFF_symbol* symtab_i;
2303 if (i >= (Int32)(hdr->NumberOfSymbols)) break;
2304 symtab_i = (COFF_symbol*)
2305 myindex ( sizeof_COFF_symbol, symtab, i );
2311 printName ( symtab_i->Name, strtab );
2320 (Int32)(symtab_i->SectionNumber),
2321 (UInt32)symtab_i->Type,
2322 (UInt32)symtab_i->StorageClass,
2323 (UInt32)symtab_i->NumberOfAuxSymbols
2325 i += symtab_i->NumberOfAuxSymbols;
2335 ocGetNames_PEi386 ( ObjectCode* oc )
2338 COFF_section* sectab;
2339 COFF_symbol* symtab;
2346 hdr = (COFF_header*)(oc->image);
2347 sectab = (COFF_section*) (
2348 ((UChar*)(oc->image))
2349 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2351 symtab = (COFF_symbol*) (
2352 ((UChar*)(oc->image))
2353 + hdr->PointerToSymbolTable
2355 strtab = ((UChar*)(oc->image))
2356 + hdr->PointerToSymbolTable
2357 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
2359 /* Allocate space for any (local, anonymous) .bss sections. */
2361 for (i = 0; i < hdr->NumberOfSections; i++) {
2364 COFF_section* sectab_i
2366 myindex ( sizeof_COFF_section, sectab, i );
2367 if (0 != strcmp(sectab_i->Name, ".bss")) continue;
2368 /* sof 10/05: the PE spec text isn't too clear regarding what
2369 * the SizeOfRawData field is supposed to hold for object
2370 * file sections containing just uninitialized data -- for executables,
2371 * it is supposed to be zero; unclear what it's supposed to be
2372 * for object files. However, VirtualSize is guaranteed to be
2373 * zero for object files, which definitely suggests that SizeOfRawData
2374 * will be non-zero (where else would the size of this .bss section be
2375 * stored?) Looking at the COFF_section info for incoming object files,
2376 * this certainly appears to be the case.
2378 * => I suspect we've been incorrectly handling .bss sections in (relocatable)
2379 * object files up until now. This turned out to bite us with ghc-6.4.1's use
2380 * of gcc-3.4.x, which has started to emit initially-zeroed-out local 'static'
2381 * variable decls into to the .bss section. (The specific function in Q which
2382 * triggered this is libraries/base/cbits/dirUtils.c:__hscore_getFolderPath())
2384 if (sectab_i->VirtualSize == 0 && sectab_i->SizeOfRawData == 0) continue;
2385 /* This is a non-empty .bss section. Allocate zeroed space for
2386 it, and set its PointerToRawData field such that oc->image +
2387 PointerToRawData == addr_of_zeroed_space. */
2388 bss_sz = sectab_i->VirtualSize;
2389 if ( bss_sz < sectab_i->SizeOfRawData) { bss_sz = sectab_i->SizeOfRawData; }
2390 zspace = stgCallocBytes(1, bss_sz, "ocGetNames_PEi386(anonymous bss)");
2391 sectab_i->PointerToRawData = ((UChar*)zspace) - ((UChar*)(oc->image));
2392 addProddableBlock(oc, zspace, bss_sz);
2393 /* debugBelch("BSS anon section at 0x%x\n", zspace); */
2396 /* Copy section information into the ObjectCode. */
2398 for (i = 0; i < hdr->NumberOfSections; i++) {
2404 = SECTIONKIND_OTHER;
2405 COFF_section* sectab_i
2407 myindex ( sizeof_COFF_section, sectab, i );
2408 IF_DEBUG(linker, debugBelch("section name = %s\n", sectab_i->Name ));
2411 /* I'm sure this is the Right Way to do it. However, the
2412 alternative of testing the sectab_i->Name field seems to
2413 work ok with Cygwin.
2415 if (sectab_i->Characteristics & MYIMAGE_SCN_CNT_CODE ||
2416 sectab_i->Characteristics & MYIMAGE_SCN_CNT_INITIALIZED_DATA)
2417 kind = SECTIONKIND_CODE_OR_RODATA;
2420 if (0==strcmp(".text",sectab_i->Name) ||
2421 0==strcmp(".rdata",sectab_i->Name)||
2422 0==strcmp(".rodata",sectab_i->Name))
2423 kind = SECTIONKIND_CODE_OR_RODATA;
2424 if (0==strcmp(".data",sectab_i->Name) ||
2425 0==strcmp(".bss",sectab_i->Name))
2426 kind = SECTIONKIND_RWDATA;
2428 ASSERT(sectab_i->SizeOfRawData == 0 || sectab_i->VirtualSize == 0);
2429 sz = sectab_i->SizeOfRawData;
2430 if (sz < sectab_i->VirtualSize) sz = sectab_i->VirtualSize;
2432 start = ((UChar*)(oc->image)) + sectab_i->PointerToRawData;
2433 end = start + sz - 1;
2435 if (kind == SECTIONKIND_OTHER
2436 /* Ignore sections called which contain stabs debugging
2438 && 0 != strcmp(".stab", sectab_i->Name)
2439 && 0 != strcmp(".stabstr", sectab_i->Name)
2440 /* ignore constructor section for now */
2441 && 0 != strcmp(".ctors", sectab_i->Name)
2442 /* ignore section generated from .ident */
2443 && 0!= strcmp("/4", sectab_i->Name)
2444 /* ignore unknown section that appeared in gcc 3.4.5(?) */
2445 && 0!= strcmp(".reloc", sectab_i->Name)
2447 errorBelch("Unknown PEi386 section name `%s' (while processing: %s)", sectab_i->Name, oc->fileName);
2451 if (kind != SECTIONKIND_OTHER && end >= start) {
2452 addSection(oc, kind, start, end);
2453 addProddableBlock(oc, start, end - start + 1);
2457 /* Copy exported symbols into the ObjectCode. */
2459 oc->n_symbols = hdr->NumberOfSymbols;
2460 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
2461 "ocGetNames_PEi386(oc->symbols)");
2462 /* Call me paranoid; I don't care. */
2463 for (i = 0; i < oc->n_symbols; i++)
2464 oc->symbols[i] = NULL;
2468 COFF_symbol* symtab_i;
2469 if (i >= (Int32)(hdr->NumberOfSymbols)) break;
2470 symtab_i = (COFF_symbol*)
2471 myindex ( sizeof_COFF_symbol, symtab, i );
2475 if (symtab_i->StorageClass == MYIMAGE_SYM_CLASS_EXTERNAL
2476 && symtab_i->SectionNumber != MYIMAGE_SYM_UNDEFINED) {
2477 /* This symbol is global and defined, viz, exported */
2478 /* for MYIMAGE_SYMCLASS_EXTERNAL
2479 && !MYIMAGE_SYM_UNDEFINED,
2480 the address of the symbol is:
2481 address of relevant section + offset in section
2483 COFF_section* sectabent
2484 = (COFF_section*) myindex ( sizeof_COFF_section,
2486 symtab_i->SectionNumber-1 );
2487 addr = ((UChar*)(oc->image))
2488 + (sectabent->PointerToRawData
2492 if (symtab_i->SectionNumber == MYIMAGE_SYM_UNDEFINED
2493 && symtab_i->Value > 0) {
2494 /* This symbol isn't in any section at all, ie, global bss.
2495 Allocate zeroed space for it. */
2496 addr = stgCallocBytes(1, symtab_i->Value,
2497 "ocGetNames_PEi386(non-anonymous bss)");
2498 addSection(oc, SECTIONKIND_RWDATA, addr,
2499 ((UChar*)addr) + symtab_i->Value - 1);
2500 addProddableBlock(oc, addr, symtab_i->Value);
2501 /* debugBelch("BSS section at 0x%x\n", addr); */
2504 if (addr != NULL ) {
2505 sname = cstring_from_COFF_symbol_name ( symtab_i->Name, strtab );
2506 /* debugBelch("addSymbol %p `%s \n", addr,sname); */
2507 IF_DEBUG(linker, debugBelch("addSymbol %p `%s'\n", addr,sname);)
2508 ASSERT(i >= 0 && i < oc->n_symbols);
2509 /* cstring_from_COFF_symbol_name always succeeds. */
2510 oc->symbols[i] = sname;
2511 ghciInsertStrHashTable(oc->fileName, symhash, sname, addr);
2515 "IGNORING symbol %d\n"
2519 printName ( symtab_i->Name, strtab );
2528 (Int32)(symtab_i->SectionNumber),
2529 (UInt32)symtab_i->Type,
2530 (UInt32)symtab_i->StorageClass,
2531 (UInt32)symtab_i->NumberOfAuxSymbols
2536 i += symtab_i->NumberOfAuxSymbols;
2545 ocResolve_PEi386 ( ObjectCode* oc )
2548 COFF_section* sectab;
2549 COFF_symbol* symtab;
2559 /* ToDo: should be variable-sized? But is at least safe in the
2560 sense of buffer-overrun-proof. */
2562 /* debugBelch("resolving for %s\n", oc->fileName); */
2564 hdr = (COFF_header*)(oc->image);
2565 sectab = (COFF_section*) (
2566 ((UChar*)(oc->image))
2567 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2569 symtab = (COFF_symbol*) (
2570 ((UChar*)(oc->image))
2571 + hdr->PointerToSymbolTable
2573 strtab = ((UChar*)(oc->image))
2574 + hdr->PointerToSymbolTable
2575 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
2577 for (i = 0; i < hdr->NumberOfSections; i++) {
2578 COFF_section* sectab_i
2580 myindex ( sizeof_COFF_section, sectab, i );
2583 ((UChar*)(oc->image)) + sectab_i->PointerToRelocations
2586 /* Ignore sections called which contain stabs debugging
2588 if (0 == strcmp(".stab", sectab_i->Name)
2589 || 0 == strcmp(".stabstr", sectab_i->Name)
2590 || 0 == strcmp(".ctors", sectab_i->Name))
2593 if ( sectab_i->Characteristics & MYIMAGE_SCN_LNK_NRELOC_OVFL ) {
2594 /* If the relocation field (a short) has overflowed, the
2595 * real count can be found in the first reloc entry.
2597 * See Section 4.1 (last para) of the PE spec (rev6.0).
2599 * Nov2003 update: the GNU linker still doesn't correctly
2600 * handle the generation of relocatable object files with
2601 * overflown relocations. Hence the output to warn of potential
2604 COFF_reloc* rel = (COFF_reloc*)
2605 myindex ( sizeof_COFF_reloc, reltab, 0 );
2606 noRelocs = rel->VirtualAddress;
2608 /* 10/05: we now assume (and check for) a GNU ld that is capable
2609 * of handling object files with (>2^16) of relocs.
2612 debugBelch("WARNING: Overflown relocation field (# relocs found: %u)\n",
2617 noRelocs = sectab_i->NumberOfRelocations;
2622 for (; j < noRelocs; j++) {
2624 COFF_reloc* reltab_j
2626 myindex ( sizeof_COFF_reloc, reltab, j );
2628 /* the location to patch */
2630 ((UChar*)(oc->image))
2631 + (sectab_i->PointerToRawData
2632 + reltab_j->VirtualAddress
2633 - sectab_i->VirtualAddress )
2635 /* the existing contents of pP */
2637 /* the symbol to connect to */
2638 sym = (COFF_symbol*)
2639 myindex ( sizeof_COFF_symbol,
2640 symtab, reltab_j->SymbolTableIndex );
2643 "reloc sec %2d num %3d: type 0x%-4x "
2644 "vaddr 0x%-8x name `",
2646 (UInt32)reltab_j->Type,
2647 reltab_j->VirtualAddress );
2648 printName ( sym->Name, strtab );
2649 debugBelch("'\n" ));
2651 if (sym->StorageClass == MYIMAGE_SYM_CLASS_STATIC) {
2652 COFF_section* section_sym
2653 = findPEi386SectionCalled ( oc, sym->Name );
2655 errorBelch("%s: can't find section `%s'", oc->fileName, sym->Name);
2658 S = ((UInt32)(oc->image))
2659 + (section_sym->PointerToRawData
2662 copyName ( sym->Name, strtab, symbol, 1000-1 );
2663 S = (UInt32) lookupSymbol( symbol );
2664 if ((void*)S != NULL) goto foundit;
2665 errorBelch("%s: unknown symbol `%s'", oc->fileName, symbol);
2669 checkProddableBlock(oc, pP);
2670 switch (reltab_j->Type) {
2671 case MYIMAGE_REL_I386_DIR32:
2674 case MYIMAGE_REL_I386_REL32:
2675 /* Tricky. We have to insert a displacement at
2676 pP which, when added to the PC for the _next_
2677 insn, gives the address of the target (S).
2678 Problem is to know the address of the next insn
2679 when we only know pP. We assume that this
2680 literal field is always the last in the insn,
2681 so that the address of the next insn is pP+4
2682 -- hence the constant 4.
2683 Also I don't know if A should be added, but so
2684 far it has always been zero.
2686 SOF 05/2005: 'A' (old contents of *pP) have been observed
2687 to contain values other than zero (the 'wx' object file
2688 that came with wxhaskell-0.9.4; dunno how it was compiled..).
2689 So, add displacement to old value instead of asserting
2690 A to be zero. Fixes wxhaskell-related crashes, and no other
2691 ill effects have been observed.
2693 Update: the reason why we're seeing these more elaborate
2694 relocations is due to a switch in how the NCG compiles SRTs
2695 and offsets to them from info tables. SRTs live in .(ro)data,
2696 while info tables live in .text, causing GAS to emit REL32/DISP32
2697 relocations with non-zero values. Adding the displacement is
2698 the right thing to do.
2700 *pP = S - ((UInt32)pP) - 4 + A;
2703 debugBelch("%s: unhandled PEi386 relocation type %d",
2704 oc->fileName, reltab_j->Type);
2711 IF_DEBUG(linker, debugBelch("completed %s", oc->fileName));
2715 #endif /* defined(OBJFORMAT_PEi386) */
2718 /* --------------------------------------------------------------------------
2720 * ------------------------------------------------------------------------*/
2722 #if defined(OBJFORMAT_ELF)
2727 #if defined(sparc_HOST_ARCH)
2728 # define ELF_TARGET_SPARC /* Used inside <elf.h> */
2729 #elif defined(i386_HOST_ARCH)
2730 # define ELF_TARGET_386 /* Used inside <elf.h> */
2731 #elif defined(x86_64_HOST_ARCH)
2732 # define ELF_TARGET_X64_64
2734 #elif defined (ia64_HOST_ARCH)
2735 # define ELF_TARGET_IA64 /* Used inside <elf.h> */
2737 # define ELF_FUNCTION_DESC /* calling convention uses function descriptors */
2738 # define ELF_NEED_GOT /* needs Global Offset Table */
2739 # define ELF_NEED_PLT /* needs Procedure Linkage Tables */
2742 #if !defined(openbsd_HOST_OS)
2745 /* openbsd elf has things in different places, with diff names */
2746 # include <elf_abi.h>
2747 # include <machine/reloc.h>
2748 # define R_386_32 RELOC_32
2749 # define R_386_PC32 RELOC_PC32
2752 /* If elf.h doesn't define it */
2753 # ifndef R_X86_64_PC64
2754 # define R_X86_64_PC64 24
2758 * Define a set of types which can be used for both ELF32 and ELF64
2762 #define ELFCLASS ELFCLASS64
2763 #define Elf_Addr Elf64_Addr
2764 #define Elf_Word Elf64_Word
2765 #define Elf_Sword Elf64_Sword
2766 #define Elf_Ehdr Elf64_Ehdr
2767 #define Elf_Phdr Elf64_Phdr
2768 #define Elf_Shdr Elf64_Shdr
2769 #define Elf_Sym Elf64_Sym
2770 #define Elf_Rel Elf64_Rel
2771 #define Elf_Rela Elf64_Rela
2772 #define ELF_ST_TYPE ELF64_ST_TYPE
2773 #define ELF_ST_BIND ELF64_ST_BIND
2774 #define ELF_R_TYPE ELF64_R_TYPE
2775 #define ELF_R_SYM ELF64_R_SYM
2777 #define ELFCLASS ELFCLASS32
2778 #define Elf_Addr Elf32_Addr
2779 #define Elf_Word Elf32_Word
2780 #define Elf_Sword Elf32_Sword
2781 #define Elf_Ehdr Elf32_Ehdr
2782 #define Elf_Phdr Elf32_Phdr
2783 #define Elf_Shdr Elf32_Shdr
2784 #define Elf_Sym Elf32_Sym
2785 #define Elf_Rel Elf32_Rel
2786 #define Elf_Rela Elf32_Rela
2788 #define ELF_ST_TYPE ELF32_ST_TYPE
2791 #define ELF_ST_BIND ELF32_ST_BIND
2794 #define ELF_R_TYPE ELF32_R_TYPE
2797 #define ELF_R_SYM ELF32_R_SYM
2803 * Functions to allocate entries in dynamic sections. Currently we simply
2804 * preallocate a large number, and we don't check if a entry for the given
2805 * target already exists (a linear search is too slow). Ideally these
2806 * entries would be associated with symbols.
2809 /* These sizes sufficient to load HSbase + HShaskell98 + a few modules */
2810 #define GOT_SIZE 0x20000
2811 #define FUNCTION_TABLE_SIZE 0x10000
2812 #define PLT_SIZE 0x08000
2815 static Elf_Addr got[GOT_SIZE];
2816 static unsigned int gotIndex;
2817 static Elf_Addr gp_val = (Elf_Addr)got;
2820 allocateGOTEntry(Elf_Addr target)
2824 if (gotIndex >= GOT_SIZE)
2825 barf("Global offset table overflow");
2827 entry = &got[gotIndex++];
2829 return (Elf_Addr)entry;
2833 #ifdef ELF_FUNCTION_DESC
2839 static FunctionDesc functionTable[FUNCTION_TABLE_SIZE];
2840 static unsigned int functionTableIndex;
2843 allocateFunctionDesc(Elf_Addr target)
2845 FunctionDesc *entry;
2847 if (functionTableIndex >= FUNCTION_TABLE_SIZE)
2848 barf("Function table overflow");
2850 entry = &functionTable[functionTableIndex++];
2852 entry->gp = (Elf_Addr)gp_val;
2853 return (Elf_Addr)entry;
2857 copyFunctionDesc(Elf_Addr target)
2859 FunctionDesc *olddesc = (FunctionDesc *)target;
2860 FunctionDesc *newdesc;
2862 newdesc = (FunctionDesc *)allocateFunctionDesc(olddesc->ip);
2863 newdesc->gp = olddesc->gp;
2864 return (Elf_Addr)newdesc;
2869 #ifdef ia64_HOST_ARCH
2870 static void ia64_reloc_gprel22(Elf_Addr target, Elf_Addr value);
2871 static void ia64_reloc_pcrel21(Elf_Addr target, Elf_Addr value, ObjectCode *oc);
2873 static unsigned char plt_code[] =
2875 /* taken from binutils bfd/elfxx-ia64.c */
2876 0x0b, 0x78, 0x00, 0x02, 0x00, 0x24, /* [MMI] addl r15=0,r1;; */
2877 0x00, 0x41, 0x3c, 0x30, 0x28, 0xc0, /* ld8 r16=[r15],8 */
2878 0x01, 0x08, 0x00, 0x84, /* mov r14=r1;; */
2879 0x11, 0x08, 0x00, 0x1e, 0x18, 0x10, /* [MIB] ld8 r1=[r15] */
2880 0x60, 0x80, 0x04, 0x80, 0x03, 0x00, /* mov b6=r16 */
2881 0x60, 0x00, 0x80, 0x00 /* br.few b6;; */
2884 /* If we can't get to the function descriptor via gp, take a local copy of it */
2885 #define PLT_RELOC(code, target) { \
2886 Elf64_Sxword rel_value = target - gp_val; \
2887 if ((rel_value > 0x1fffff) || (rel_value < -0x1fffff)) \
2888 ia64_reloc_gprel22((Elf_Addr)code, copyFunctionDesc(target)); \
2890 ia64_reloc_gprel22((Elf_Addr)code, target); \
2895 unsigned char code[sizeof(plt_code)];
2899 allocatePLTEntry(Elf_Addr target, ObjectCode *oc)
2901 PLTEntry *plt = (PLTEntry *)oc->plt;
2904 if (oc->pltIndex >= PLT_SIZE)
2905 barf("Procedure table overflow");
2907 entry = &plt[oc->pltIndex++];
2908 memcpy(entry->code, plt_code, sizeof(entry->code));
2909 PLT_RELOC(entry->code, target);
2910 return (Elf_Addr)entry;
2916 return (PLT_SIZE * sizeof(PLTEntry));
2922 * Generic ELF functions
2926 findElfSection ( void* objImage, Elf_Word sh_type )
2928 char* ehdrC = (char*)objImage;
2929 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2930 Elf_Shdr* shdr = (Elf_Shdr*)(ehdrC + ehdr->e_shoff);
2931 char* sh_strtab = ehdrC + shdr[ehdr->e_shstrndx].sh_offset;
2935 for (i = 0; i < ehdr->e_shnum; i++) {
2936 if (shdr[i].sh_type == sh_type
2937 /* Ignore the section header's string table. */
2938 && i != ehdr->e_shstrndx
2939 /* Ignore string tables named .stabstr, as they contain
2941 && 0 != memcmp(".stabstr", sh_strtab + shdr[i].sh_name, 8)
2943 ptr = ehdrC + shdr[i].sh_offset;
2950 #if defined(ia64_HOST_ARCH)
2952 findElfSegment ( void* objImage, Elf_Addr vaddr )
2954 char* ehdrC = (char*)objImage;
2955 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2956 Elf_Phdr* phdr = (Elf_Phdr*)(ehdrC + ehdr->e_phoff);
2957 Elf_Addr segaddr = 0;
2960 for (i = 0; i < ehdr->e_phnum; i++) {
2961 segaddr = phdr[i].p_vaddr;
2962 if ((vaddr >= segaddr) && (vaddr < segaddr + phdr[i].p_memsz))
2970 ocVerifyImage_ELF ( ObjectCode* oc )
2974 int i, j, nent, nstrtab, nsymtabs;
2978 char* ehdrC = (char*)(oc->image);
2979 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2981 if (ehdr->e_ident[EI_MAG0] != ELFMAG0 ||
2982 ehdr->e_ident[EI_MAG1] != ELFMAG1 ||
2983 ehdr->e_ident[EI_MAG2] != ELFMAG2 ||
2984 ehdr->e_ident[EI_MAG3] != ELFMAG3) {
2985 errorBelch("%s: not an ELF object", oc->fileName);
2989 if (ehdr->e_ident[EI_CLASS] != ELFCLASS) {
2990 errorBelch("%s: unsupported ELF format", oc->fileName);
2994 if (ehdr->e_ident[EI_DATA] == ELFDATA2LSB) {
2995 IF_DEBUG(linker,debugBelch( "Is little-endian\n" ));
2997 if (ehdr->e_ident[EI_DATA] == ELFDATA2MSB) {
2998 IF_DEBUG(linker,debugBelch( "Is big-endian\n" ));
3000 errorBelch("%s: unknown endiannness", oc->fileName);
3004 if (ehdr->e_type != ET_REL) {
3005 errorBelch("%s: not a relocatable object (.o) file", oc->fileName);
3008 IF_DEBUG(linker, debugBelch( "Is a relocatable object (.o) file\n" ));
3010 IF_DEBUG(linker,debugBelch( "Architecture is " ));
3011 switch (ehdr->e_machine) {
3012 case EM_386: IF_DEBUG(linker,debugBelch( "x86" )); break;
3013 #ifdef EM_SPARC32PLUS
3014 case EM_SPARC32PLUS:
3016 case EM_SPARC: IF_DEBUG(linker,debugBelch( "sparc" )); break;
3018 case EM_IA_64: IF_DEBUG(linker,debugBelch( "ia64" )); break;
3020 case EM_PPC: IF_DEBUG(linker,debugBelch( "powerpc32" )); break;
3022 case EM_X86_64: IF_DEBUG(linker,debugBelch( "x86_64" )); break;
3023 #elif defined(EM_AMD64)
3024 case EM_AMD64: IF_DEBUG(linker,debugBelch( "amd64" )); break;
3026 default: IF_DEBUG(linker,debugBelch( "unknown" ));
3027 errorBelch("%s: unknown architecture (e_machine == %d)"
3028 , oc->fileName, ehdr->e_machine);
3032 IF_DEBUG(linker,debugBelch(
3033 "\nSection header table: start %ld, n_entries %d, ent_size %d\n",
3034 (long)ehdr->e_shoff, ehdr->e_shnum, ehdr->e_shentsize ));
3036 ASSERT (ehdr->e_shentsize == sizeof(Elf_Shdr));
3038 shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
3040 if (ehdr->e_shstrndx == SHN_UNDEF) {
3041 errorBelch("%s: no section header string table", oc->fileName);
3044 IF_DEBUG(linker,debugBelch( "Section header string table is section %d\n",
3046 sh_strtab = ehdrC + shdr[ehdr->e_shstrndx].sh_offset;
3049 for (i = 0; i < ehdr->e_shnum; i++) {
3050 IF_DEBUG(linker,debugBelch("%2d: ", i ));
3051 IF_DEBUG(linker,debugBelch("type=%2d ", (int)shdr[i].sh_type ));
3052 IF_DEBUG(linker,debugBelch("size=%4d ", (int)shdr[i].sh_size ));
3053 IF_DEBUG(linker,debugBelch("offs=%4d ", (int)shdr[i].sh_offset ));
3054 IF_DEBUG(linker,debugBelch(" (%p .. %p) ",
3055 ehdrC + shdr[i].sh_offset,
3056 ehdrC + shdr[i].sh_offset + shdr[i].sh_size - 1));
3058 if (shdr[i].sh_type == SHT_REL) {
3059 IF_DEBUG(linker,debugBelch("Rel " ));
3060 } else if (shdr[i].sh_type == SHT_RELA) {
3061 IF_DEBUG(linker,debugBelch("RelA " ));
3063 IF_DEBUG(linker,debugBelch(" "));
3066 IF_DEBUG(linker,debugBelch("sname=%s\n", sh_strtab + shdr[i].sh_name ));
3070 IF_DEBUG(linker,debugBelch( "\nString tables" ));
3073 for (i = 0; i < ehdr->e_shnum; i++) {
3074 if (shdr[i].sh_type == SHT_STRTAB
3075 /* Ignore the section header's string table. */
3076 && i != ehdr->e_shstrndx
3077 /* Ignore string tables named .stabstr, as they contain
3079 && 0 != memcmp(".stabstr", sh_strtab + shdr[i].sh_name, 8)
3081 IF_DEBUG(linker,debugBelch(" section %d is a normal string table", i ));
3082 strtab = ehdrC + shdr[i].sh_offset;
3087 errorBelch("%s: no string tables, or too many", oc->fileName);
3092 IF_DEBUG(linker,debugBelch( "\nSymbol tables" ));
3093 for (i = 0; i < ehdr->e_shnum; i++) {
3094 if (shdr[i].sh_type != SHT_SYMTAB) continue;
3095 IF_DEBUG(linker,debugBelch( "section %d is a symbol table\n", i ));
3097 stab = (Elf_Sym*) (ehdrC + shdr[i].sh_offset);
3098 nent = shdr[i].sh_size / sizeof(Elf_Sym);
3099 IF_DEBUG(linker,debugBelch( " number of entries is apparently %d (%ld rem)\n",
3101 (long)shdr[i].sh_size % sizeof(Elf_Sym)
3103 if (0 != shdr[i].sh_size % sizeof(Elf_Sym)) {
3104 errorBelch("%s: non-integral number of symbol table entries", oc->fileName);
3107 for (j = 0; j < nent; j++) {
3108 IF_DEBUG(linker,debugBelch(" %2d ", j ));
3109 IF_DEBUG(linker,debugBelch(" sec=%-5d size=%-3d val=%5p ",
3110 (int)stab[j].st_shndx,
3111 (int)stab[j].st_size,
3112 (char*)stab[j].st_value ));
3114 IF_DEBUG(linker,debugBelch("type=" ));
3115 switch (ELF_ST_TYPE(stab[j].st_info)) {
3116 case STT_NOTYPE: IF_DEBUG(linker,debugBelch("notype " )); break;
3117 case STT_OBJECT: IF_DEBUG(linker,debugBelch("object " )); break;
3118 case STT_FUNC : IF_DEBUG(linker,debugBelch("func " )); break;
3119 case STT_SECTION: IF_DEBUG(linker,debugBelch("section" )); break;
3120 case STT_FILE: IF_DEBUG(linker,debugBelch("file " )); break;
3121 default: IF_DEBUG(linker,debugBelch("? " )); break;
3123 IF_DEBUG(linker,debugBelch(" " ));
3125 IF_DEBUG(linker,debugBelch("bind=" ));
3126 switch (ELF_ST_BIND(stab[j].st_info)) {
3127 case STB_LOCAL : IF_DEBUG(linker,debugBelch("local " )); break;
3128 case STB_GLOBAL: IF_DEBUG(linker,debugBelch("global" )); break;
3129 case STB_WEAK : IF_DEBUG(linker,debugBelch("weak " )); break;
3130 default: IF_DEBUG(linker,debugBelch("? " )); break;
3132 IF_DEBUG(linker,debugBelch(" " ));
3134 IF_DEBUG(linker,debugBelch("name=%s\n", strtab + stab[j].st_name ));
3138 if (nsymtabs == 0) {
3139 errorBelch("%s: didn't find any symbol tables", oc->fileName);
3146 static int getSectionKind_ELF( Elf_Shdr *hdr, int *is_bss )
3150 if (hdr->sh_type == SHT_PROGBITS
3151 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_EXECINSTR)) {
3152 /* .text-style section */
3153 return SECTIONKIND_CODE_OR_RODATA;
3156 if (hdr->sh_type == SHT_PROGBITS
3157 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_WRITE)) {
3158 /* .data-style section */
3159 return SECTIONKIND_RWDATA;
3162 if (hdr->sh_type == SHT_PROGBITS
3163 && (hdr->sh_flags & SHF_ALLOC) && !(hdr->sh_flags & SHF_WRITE)) {
3164 /* .rodata-style section */
3165 return SECTIONKIND_CODE_OR_RODATA;
3168 if (hdr->sh_type == SHT_NOBITS
3169 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_WRITE)) {
3170 /* .bss-style section */
3172 return SECTIONKIND_RWDATA;
3175 return SECTIONKIND_OTHER;
3180 ocGetNames_ELF ( ObjectCode* oc )
3185 char* ehdrC = (char*)(oc->image);
3186 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
3187 char* strtab = findElfSection ( ehdrC, SHT_STRTAB );
3188 Elf_Shdr* shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
3190 ASSERT(symhash != NULL);
3193 errorBelch("%s: no strtab", oc->fileName);
3198 for (i = 0; i < ehdr->e_shnum; i++) {
3199 /* Figure out what kind of section it is. Logic derived from
3200 Figure 1.14 ("Special Sections") of the ELF document
3201 ("Portable Formats Specification, Version 1.1"). */
3203 SectionKind kind = getSectionKind_ELF(&shdr[i], &is_bss);
3205 if (is_bss && shdr[i].sh_size > 0) {
3206 /* This is a non-empty .bss section. Allocate zeroed space for
3207 it, and set its .sh_offset field such that
3208 ehdrC + .sh_offset == addr_of_zeroed_space. */
3209 char* zspace = stgCallocBytes(1, shdr[i].sh_size,
3210 "ocGetNames_ELF(BSS)");
3211 shdr[i].sh_offset = ((char*)zspace) - ((char*)ehdrC);
3213 debugBelch("BSS section at 0x%x, size %d\n",
3214 zspace, shdr[i].sh_size);
3218 /* fill in the section info */
3219 if (kind != SECTIONKIND_OTHER && shdr[i].sh_size > 0) {
3220 addProddableBlock(oc, ehdrC + shdr[i].sh_offset, shdr[i].sh_size);
3221 addSection(oc, kind, ehdrC + shdr[i].sh_offset,
3222 ehdrC + shdr[i].sh_offset + shdr[i].sh_size - 1);
3225 if (shdr[i].sh_type != SHT_SYMTAB) continue;
3227 /* copy stuff into this module's object symbol table */
3228 stab = (Elf_Sym*) (ehdrC + shdr[i].sh_offset);
3229 nent = shdr[i].sh_size / sizeof(Elf_Sym);
3231 oc->n_symbols = nent;
3232 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
3233 "ocGetNames_ELF(oc->symbols)");
3235 for (j = 0; j < nent; j++) {
3237 char isLocal = FALSE; /* avoids uninit-var warning */
3239 char* nm = strtab + stab[j].st_name;
3240 int secno = stab[j].st_shndx;
3242 /* Figure out if we want to add it; if so, set ad to its
3243 address. Otherwise leave ad == NULL. */
3245 if (secno == SHN_COMMON) {
3247 ad = stgCallocBytes(1, stab[j].st_size, "ocGetNames_ELF(COMMON)");
3249 debugBelch("COMMON symbol, size %d name %s\n",
3250 stab[j].st_size, nm);
3252 /* Pointless to do addProddableBlock() for this area,
3253 since the linker should never poke around in it. */
3256 if ( ( ELF_ST_BIND(stab[j].st_info)==STB_GLOBAL
3257 || ELF_ST_BIND(stab[j].st_info)==STB_LOCAL
3259 /* and not an undefined symbol */
3260 && stab[j].st_shndx != SHN_UNDEF
3261 /* and not in a "special section" */
3262 && stab[j].st_shndx < SHN_LORESERVE
3264 /* and it's a not a section or string table or anything silly */
3265 ( ELF_ST_TYPE(stab[j].st_info)==STT_FUNC ||
3266 ELF_ST_TYPE(stab[j].st_info)==STT_OBJECT ||
3267 ELF_ST_TYPE(stab[j].st_info)==STT_NOTYPE
3270 /* Section 0 is the undefined section, hence > and not >=. */
3271 ASSERT(secno > 0 && secno < ehdr->e_shnum);
3273 if (shdr[secno].sh_type == SHT_NOBITS) {
3274 debugBelch(" BSS symbol, size %d off %d name %s\n",
3275 stab[j].st_size, stab[j].st_value, nm);
3278 ad = ehdrC + shdr[ secno ].sh_offset + stab[j].st_value;
3279 if (ELF_ST_BIND(stab[j].st_info)==STB_LOCAL) {
3282 #ifdef ELF_FUNCTION_DESC
3283 /* dlsym() and the initialisation table both give us function
3284 * descriptors, so to be consistent we store function descriptors
3285 * in the symbol table */
3286 if (ELF_ST_TYPE(stab[j].st_info) == STT_FUNC)
3287 ad = (char *)allocateFunctionDesc((Elf_Addr)ad);
3289 IF_DEBUG(linker,debugBelch( "addOTabName(GLOB): %10p %s %s\n",
3290 ad, oc->fileName, nm ));
3295 /* And the decision is ... */
3299 oc->symbols[j] = nm;
3302 /* Ignore entirely. */
3304 ghciInsertStrHashTable(oc->fileName, symhash, nm, ad);
3308 IF_DEBUG(linker,debugBelch( "skipping `%s'\n",
3309 strtab + stab[j].st_name ));
3312 "skipping bind = %d, type = %d, shndx = %d `%s'\n",
3313 (int)ELF_ST_BIND(stab[j].st_info),
3314 (int)ELF_ST_TYPE(stab[j].st_info),
3315 (int)stab[j].st_shndx,
3316 strtab + stab[j].st_name
3319 oc->symbols[j] = NULL;
3328 /* Do ELF relocations which lack an explicit addend. All x86-linux
3329 relocations appear to be of this form. */
3331 do_Elf_Rel_relocations ( ObjectCode* oc, char* ehdrC,
3332 Elf_Shdr* shdr, int shnum,
3333 Elf_Sym* stab, char* strtab )
3338 Elf_Rel* rtab = (Elf_Rel*) (ehdrC + shdr[shnum].sh_offset);
3339 int nent = shdr[shnum].sh_size / sizeof(Elf_Rel);
3340 int target_shndx = shdr[shnum].sh_info;
3341 int symtab_shndx = shdr[shnum].sh_link;
3343 stab = (Elf_Sym*) (ehdrC + shdr[ symtab_shndx ].sh_offset);
3344 targ = (Elf_Word*)(ehdrC + shdr[ target_shndx ].sh_offset);
3345 IF_DEBUG(linker,debugBelch( "relocations for section %d using symtab %d\n",
3346 target_shndx, symtab_shndx ));
3348 /* Skip sections that we're not interested in. */
3351 SectionKind kind = getSectionKind_ELF(&shdr[target_shndx], &is_bss);
3352 if (kind == SECTIONKIND_OTHER) {
3353 IF_DEBUG(linker,debugBelch( "skipping (target section not loaded)"));
3358 for (j = 0; j < nent; j++) {
3359 Elf_Addr offset = rtab[j].r_offset;
3360 Elf_Addr info = rtab[j].r_info;
3362 Elf_Addr P = ((Elf_Addr)targ) + offset;
3363 Elf_Word* pP = (Elf_Word*)P;
3368 StgStablePtr stablePtr;
3371 IF_DEBUG(linker,debugBelch( "Rel entry %3d is raw(%6p %6p)",
3372 j, (void*)offset, (void*)info ));
3374 IF_DEBUG(linker,debugBelch( " ZERO" ));
3377 Elf_Sym sym = stab[ELF_R_SYM(info)];
3378 /* First see if it is a local symbol. */
3379 if (ELF_ST_BIND(sym.st_info) == STB_LOCAL) {
3380 /* Yes, so we can get the address directly from the ELF symbol
3382 symbol = sym.st_name==0 ? "(noname)" : strtab+sym.st_name;
3384 (ehdrC + shdr[ sym.st_shndx ].sh_offset
3385 + stab[ELF_R_SYM(info)].st_value);
3388 symbol = strtab + sym.st_name;
3389 stablePtr = (StgStablePtr)lookupHashTable(stablehash, (StgWord)symbol);
3390 if (NULL == stablePtr) {
3391 /* No, so look up the name in our global table. */
3392 S_tmp = lookupSymbol( symbol );
3393 S = (Elf_Addr)S_tmp;
3395 stableVal = deRefStablePtr( stablePtr );
3397 S = (Elf_Addr)S_tmp;
3401 errorBelch("%s: unknown symbol `%s'", oc->fileName, symbol);
3404 IF_DEBUG(linker,debugBelch( "`%s' resolves to %p\n", symbol, (void*)S ));
3407 IF_DEBUG(linker,debugBelch( "Reloc: P = %p S = %p A = %p\n",
3408 (void*)P, (void*)S, (void*)A ));
3409 checkProddableBlock ( oc, pP );
3413 switch (ELF_R_TYPE(info)) {
3414 # ifdef i386_HOST_ARCH
3415 case R_386_32: *pP = value; break;
3416 case R_386_PC32: *pP = value - P; break;
3419 errorBelch("%s: unhandled ELF relocation(Rel) type %lu\n",
3420 oc->fileName, (lnat)ELF_R_TYPE(info));
3428 /* Do ELF relocations for which explicit addends are supplied.
3429 sparc-solaris relocations appear to be of this form. */
3431 do_Elf_Rela_relocations ( ObjectCode* oc, char* ehdrC,
3432 Elf_Shdr* shdr, int shnum,
3433 Elf_Sym* stab, char* strtab )
3436 char *symbol = NULL;
3438 Elf_Rela* rtab = (Elf_Rela*) (ehdrC + shdr[shnum].sh_offset);
3439 int nent = shdr[shnum].sh_size / sizeof(Elf_Rela);
3440 int target_shndx = shdr[shnum].sh_info;
3441 int symtab_shndx = shdr[shnum].sh_link;
3443 stab = (Elf_Sym*) (ehdrC + shdr[ symtab_shndx ].sh_offset);
3444 targ = (Elf_Addr) (ehdrC + shdr[ target_shndx ].sh_offset);
3445 IF_DEBUG(linker,debugBelch( "relocations for section %d using symtab %d\n",
3446 target_shndx, symtab_shndx ));
3448 for (j = 0; j < nent; j++) {
3449 #if defined(DEBUG) || defined(sparc_HOST_ARCH) || defined(ia64_HOST_ARCH) || defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH)
3450 /* This #ifdef only serves to avoid unused-var warnings. */
3451 Elf_Addr offset = rtab[j].r_offset;
3452 Elf_Addr P = targ + offset;
3454 Elf_Addr info = rtab[j].r_info;
3455 Elf_Addr A = rtab[j].r_addend;
3459 # if defined(sparc_HOST_ARCH)
3460 Elf_Word* pP = (Elf_Word*)P;
3462 # elif defined(ia64_HOST_ARCH)
3463 Elf64_Xword *pP = (Elf64_Xword *)P;
3465 # elif defined(powerpc_HOST_ARCH)
3469 IF_DEBUG(linker,debugBelch( "Rel entry %3d is raw(%6p %6p %6p) ",
3470 j, (void*)offset, (void*)info,
3473 IF_DEBUG(linker,debugBelch( " ZERO" ));
3476 Elf_Sym sym = stab[ELF_R_SYM(info)];
3477 /* First see if it is a local symbol. */
3478 if (ELF_ST_BIND(sym.st_info) == STB_LOCAL) {
3479 /* Yes, so we can get the address directly from the ELF symbol
3481 symbol = sym.st_name==0 ? "(noname)" : strtab+sym.st_name;
3483 (ehdrC + shdr[ sym.st_shndx ].sh_offset
3484 + stab[ELF_R_SYM(info)].st_value);
3485 #ifdef ELF_FUNCTION_DESC
3486 /* Make a function descriptor for this function */
3487 if (S && ELF_ST_TYPE(sym.st_info) == STT_FUNC) {
3488 S = allocateFunctionDesc(S + A);
3493 /* No, so look up the name in our global table. */
3494 symbol = strtab + sym.st_name;
3495 S_tmp = lookupSymbol( symbol );
3496 S = (Elf_Addr)S_tmp;
3498 #ifdef ELF_FUNCTION_DESC
3499 /* If a function, already a function descriptor - we would
3500 have to copy it to add an offset. */
3501 if (S && (ELF_ST_TYPE(sym.st_info) == STT_FUNC) && (A != 0))
3502 errorBelch("%s: function %s with addend %p", oc->fileName, symbol, (void *)A);
3506 errorBelch("%s: unknown symbol `%s'", oc->fileName, symbol);
3509 IF_DEBUG(linker,debugBelch( "`%s' resolves to %p", symbol, (void*)S ));
3512 IF_DEBUG(linker,debugBelch("Reloc: P = %p S = %p A = %p\n",
3513 (void*)P, (void*)S, (void*)A ));
3514 /* checkProddableBlock ( oc, (void*)P ); */
3518 switch (ELF_R_TYPE(info)) {
3519 # if defined(sparc_HOST_ARCH)
3520 case R_SPARC_WDISP30:
3521 w1 = *pP & 0xC0000000;
3522 w2 = (Elf_Word)((value - P) >> 2);
3523 ASSERT((w2 & 0xC0000000) == 0);
3528 w1 = *pP & 0xFFC00000;
3529 w2 = (Elf_Word)(value >> 10);
3530 ASSERT((w2 & 0xFFC00000) == 0);
3536 w2 = (Elf_Word)(value & 0x3FF);
3537 ASSERT((w2 & ~0x3FF) == 0);
3542 /* According to the Sun documentation:
3544 This relocation type resembles R_SPARC_32, except it refers to an
3545 unaligned word. That is, the word to be relocated must be treated
3546 as four separate bytes with arbitrary alignment, not as a word
3547 aligned according to the architecture requirements.
3550 w2 = (Elf_Word)value;
3552 // SPARC doesn't do misaligned writes of 32 bit words,
3553 // so we have to do this one byte-at-a-time.
3554 char *pPc = (char*)pP;
3555 pPc[0] = (char) ((Elf_Word)(w2 & 0xff000000) >> 24);
3556 pPc[1] = (char) ((Elf_Word)(w2 & 0x00ff0000) >> 16);
3557 pPc[2] = (char) ((Elf_Word)(w2 & 0x0000ff00) >> 8);
3558 pPc[3] = (char) ((Elf_Word)(w2 & 0x000000ff));
3562 w2 = (Elf_Word)value;
3565 # elif defined(ia64_HOST_ARCH)
3566 case R_IA64_DIR64LSB:
3567 case R_IA64_FPTR64LSB:
3570 case R_IA64_PCREL64LSB:
3573 case R_IA64_SEGREL64LSB:
3574 addr = findElfSegment(ehdrC, value);
3577 case R_IA64_GPREL22:
3578 ia64_reloc_gprel22(P, value);
3580 case R_IA64_LTOFF22:
3581 case R_IA64_LTOFF22X:
3582 case R_IA64_LTOFF_FPTR22:
3583 addr = allocateGOTEntry(value);
3584 ia64_reloc_gprel22(P, addr);
3586 case R_IA64_PCREL21B:
3587 ia64_reloc_pcrel21(P, S, oc);
3590 /* This goes with R_IA64_LTOFF22X and points to the load to
3591 * convert into a move. We don't implement relaxation. */
3593 # elif defined(powerpc_HOST_ARCH)
3594 case R_PPC_ADDR16_LO:
3595 *(Elf32_Half*) P = value;
3598 case R_PPC_ADDR16_HI:
3599 *(Elf32_Half*) P = value >> 16;
3602 case R_PPC_ADDR16_HA:
3603 *(Elf32_Half*) P = (value + 0x8000) >> 16;
3607 *(Elf32_Word *) P = value;
3611 *(Elf32_Word *) P = value - P;
3617 if( delta << 6 >> 6 != delta )
3619 value = (Elf_Addr) (&makeSymbolExtra( oc, ELF_R_SYM(info), value )
3623 if( value == 0 || delta << 6 >> 6 != delta )
3625 barf( "Unable to make SymbolExtra for #%d",
3631 *(Elf_Word *) P = (*(Elf_Word *) P & 0xfc000003)
3632 | (delta & 0x3fffffc);
3636 #if x86_64_HOST_ARCH
3638 *(Elf64_Xword *)P = value;
3643 StgInt64 off = value - P;
3644 if (off >= 0x7fffffffL || off < -0x80000000L) {
3645 #if X86_64_ELF_NONPIC_HACK
3646 StgInt64 pltAddress = (StgInt64) &makeSymbolExtra(oc, ELF_R_SYM(info), S)
3648 off = pltAddress + A - P;
3650 barf("R_X86_64_PC32 relocation out of range: %s = %p\nRecompile %s with -fPIC.",
3651 symbol, off, oc->fileName );
3654 *(Elf64_Word *)P = (Elf64_Word)off;
3660 StgInt64 off = value - P;
3661 *(Elf64_Word *)P = (Elf64_Word)off;
3666 if (value >= 0x7fffffffL) {
3667 #if X86_64_ELF_NONPIC_HACK
3668 StgInt64 pltAddress = (StgInt64) &makeSymbolExtra(oc, ELF_R_SYM(info), S)
3670 value = pltAddress + A;
3672 barf("R_X86_64_32 relocation out of range: %s = %p\nRecompile %s with -fPIC.",
3673 symbol, value, oc->fileName );
3676 *(Elf64_Word *)P = (Elf64_Word)value;
3680 if ((StgInt64)value > 0x7fffffffL || (StgInt64)value < -0x80000000L) {
3681 #if X86_64_ELF_NONPIC_HACK
3682 StgInt64 pltAddress = (StgInt64) &makeSymbolExtra(oc, ELF_R_SYM(info), S)
3684 value = pltAddress + A;
3686 barf("R_X86_64_32S relocation out of range: %s = %p\nRecompile %s with -fPIC.",
3687 symbol, value, oc->fileName );
3690 *(Elf64_Sword *)P = (Elf64_Sword)value;
3693 case R_X86_64_GOTPCREL:
3695 StgInt64 gotAddress = (StgInt64) &makeSymbolExtra(oc, ELF_R_SYM(info), S)->addr;
3696 StgInt64 off = gotAddress + A - P;
3697 *(Elf64_Word *)P = (Elf64_Word)off;
3701 case R_X86_64_PLT32:
3703 StgInt64 off = value - P;
3704 if (off >= 0x7fffffffL || off < -0x80000000L) {
3705 StgInt64 pltAddress = (StgInt64) &makeSymbolExtra(oc, ELF_R_SYM(info), S)
3707 off = pltAddress + A - P;
3709 *(Elf64_Word *)P = (Elf64_Word)off;
3715 errorBelch("%s: unhandled ELF relocation(RelA) type %lu\n",
3716 oc->fileName, (lnat)ELF_R_TYPE(info));
3725 ocResolve_ELF ( ObjectCode* oc )
3729 Elf_Sym* stab = NULL;
3730 char* ehdrC = (char*)(oc->image);
3731 Elf_Ehdr* ehdr = (Elf_Ehdr*) ehdrC;
3732 Elf_Shdr* shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
3734 /* first find "the" symbol table */
3735 stab = (Elf_Sym*) findElfSection ( ehdrC, SHT_SYMTAB );
3737 /* also go find the string table */
3738 strtab = findElfSection ( ehdrC, SHT_STRTAB );
3740 if (stab == NULL || strtab == NULL) {
3741 errorBelch("%s: can't find string or symbol table", oc->fileName);
3745 /* Process the relocation sections. */
3746 for (shnum = 0; shnum < ehdr->e_shnum; shnum++) {
3747 if (shdr[shnum].sh_type == SHT_REL) {
3748 ok = do_Elf_Rel_relocations ( oc, ehdrC, shdr,
3749 shnum, stab, strtab );
3753 if (shdr[shnum].sh_type == SHT_RELA) {
3754 ok = do_Elf_Rela_relocations ( oc, ehdrC, shdr,
3755 shnum, stab, strtab );
3760 #if defined(powerpc_HOST_ARCH)
3761 ocFlushInstructionCache( oc );
3769 * Instructions are 41 bits long, packed into 128 bit bundles with a 5-bit template
3770 * at the front. The following utility functions pack and unpack instructions, and
3771 * take care of the most common relocations.
3774 #ifdef ia64_HOST_ARCH
3777 ia64_extract_instruction(Elf64_Xword *target)
3780 int slot = (Elf_Addr)target & 3;
3781 target = (Elf_Addr)target & ~3;
3789 return ((w1 >> 5) & 0x1ffffffffff);
3791 return (w1 >> 46) | ((w2 & 0x7fffff) << 18);
3795 barf("ia64_extract_instruction: invalid slot %p", target);
3800 ia64_deposit_instruction(Elf64_Xword *target, Elf64_Xword value)
3802 int slot = (Elf_Addr)target & 3;
3803 target = (Elf_Addr)target & ~3;
3808 *target |= value << 5;
3811 *target |= value << 46;
3812 *(target+1) |= value >> 18;
3815 *(target+1) |= value << 23;
3821 ia64_reloc_gprel22(Elf_Addr target, Elf_Addr value)
3823 Elf64_Xword instruction;
3824 Elf64_Sxword rel_value;
3826 rel_value = value - gp_val;
3827 if ((rel_value > 0x1fffff) || (rel_value < -0x1fffff))
3828 barf("GP-relative data out of range (address = 0x%lx, gp = 0x%lx)", value, gp_val);
3830 instruction = ia64_extract_instruction((Elf64_Xword *)target);
3831 instruction |= (((rel_value >> 0) & 0x07f) << 13) /* imm7b */
3832 | (((rel_value >> 7) & 0x1ff) << 27) /* imm9d */
3833 | (((rel_value >> 16) & 0x01f) << 22) /* imm5c */
3834 | ((Elf64_Xword)(rel_value < 0) << 36); /* s */
3835 ia64_deposit_instruction((Elf64_Xword *)target, instruction);
3839 ia64_reloc_pcrel21(Elf_Addr target, Elf_Addr value, ObjectCode *oc)
3841 Elf64_Xword instruction;
3842 Elf64_Sxword rel_value;
3845 entry = allocatePLTEntry(value, oc);
3847 rel_value = (entry >> 4) - (target >> 4);
3848 if ((rel_value > 0xfffff) || (rel_value < -0xfffff))
3849 barf("PLT entry too far away (entry = 0x%lx, target = 0x%lx)", entry, target);
3851 instruction = ia64_extract_instruction((Elf64_Xword *)target);
3852 instruction |= ((rel_value & 0xfffff) << 13) /* imm20b */
3853 | ((Elf64_Xword)(rel_value < 0) << 36); /* s */
3854 ia64_deposit_instruction((Elf64_Xword *)target, instruction);
3860 * PowerPC & X86_64 ELF specifics
3863 #if defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH)
3865 static int ocAllocateSymbolExtras_ELF( ObjectCode *oc )
3871 ehdr = (Elf_Ehdr *) oc->image;
3872 shdr = (Elf_Shdr *) ( ((char *)oc->image) + ehdr->e_shoff );
3874 for( i = 0; i < ehdr->e_shnum; i++ )
3875 if( shdr[i].sh_type == SHT_SYMTAB )
3878 if( i == ehdr->e_shnum )
3880 errorBelch( "This ELF file contains no symtab" );
3884 if( shdr[i].sh_entsize != sizeof( Elf_Sym ) )
3886 errorBelch( "The entry size (%d) of the symtab isn't %d\n",
3887 (int) shdr[i].sh_entsize, (int) sizeof( Elf_Sym ) );
3892 return ocAllocateSymbolExtras( oc, shdr[i].sh_size / sizeof( Elf_Sym ), 0 );
3895 #endif /* powerpc */
3899 /* --------------------------------------------------------------------------
3901 * ------------------------------------------------------------------------*/
3903 #if defined(OBJFORMAT_MACHO)
3906 Support for MachO linking on Darwin/MacOS X
3907 by Wolfgang Thaller (wolfgang.thaller@gmx.net)
3909 I hereby formally apologize for the hackish nature of this code.
3910 Things that need to be done:
3911 *) implement ocVerifyImage_MachO
3912 *) add still more sanity checks.
3915 #if x86_64_HOST_ARCH || powerpc64_HOST_ARCH
3916 #define mach_header mach_header_64
3917 #define segment_command segment_command_64
3918 #define section section_64
3919 #define nlist nlist_64
3922 #ifdef powerpc_HOST_ARCH
3923 static int ocAllocateSymbolExtras_MachO(ObjectCode* oc)
3925 struct mach_header *header = (struct mach_header *) oc->image;
3926 struct load_command *lc = (struct load_command *) (header + 1);
3929 for( i = 0; i < header->ncmds; i++ )
3931 if( lc->cmd == LC_SYMTAB )
3933 // Find out the first and last undefined external
3934 // symbol, so we don't have to allocate too many
3936 struct symtab_command *symLC = (struct symtab_command *) lc;
3937 unsigned min = symLC->nsyms, max = 0;
3938 struct nlist *nlist =
3939 symLC ? (struct nlist*) ((char*) oc->image + symLC->symoff)
3941 for(i=0;i<symLC->nsyms;i++)
3943 if(nlist[i].n_type & N_STAB)
3945 else if(nlist[i].n_type & N_EXT)
3947 if((nlist[i].n_type & N_TYPE) == N_UNDF
3948 && (nlist[i].n_value == 0))
3958 return ocAllocateSymbolExtras(oc, max - min + 1, min);
3963 lc = (struct load_command *) ( ((char *)lc) + lc->cmdsize );
3965 return ocAllocateSymbolExtras(oc,0,0);
3968 #ifdef x86_64_HOST_ARCH
3969 static int ocAllocateSymbolExtras_MachO(ObjectCode* oc)
3971 struct mach_header *header = (struct mach_header *) oc->image;
3972 struct load_command *lc = (struct load_command *) (header + 1);
3975 for( i = 0; i < header->ncmds; i++ )
3977 if( lc->cmd == LC_SYMTAB )
3979 // Just allocate one entry for every symbol
3980 struct symtab_command *symLC = (struct symtab_command *) lc;
3982 return ocAllocateSymbolExtras(oc, symLC->nsyms, 0);
3985 lc = (struct load_command *) ( ((char *)lc) + lc->cmdsize );
3987 return ocAllocateSymbolExtras(oc,0,0);
3991 static int ocVerifyImage_MachO(ObjectCode* oc)
3993 char *image = (char*) oc->image;
3994 struct mach_header *header = (struct mach_header*) image;
3996 #if x86_64_TARGET_ARCH || powerpc64_TARGET_ARCH
3997 if(header->magic != MH_MAGIC_64)
4000 if(header->magic != MH_MAGIC)
4003 // FIXME: do some more verifying here
4007 static int resolveImports(
4010 struct symtab_command *symLC,
4011 struct section *sect, // ptr to lazy or non-lazy symbol pointer section
4012 unsigned long *indirectSyms,
4013 struct nlist *nlist)
4016 size_t itemSize = 4;
4019 int isJumpTable = 0;
4020 if(!strcmp(sect->sectname,"__jump_table"))
4024 ASSERT(sect->reserved2 == itemSize);
4028 for(i=0; i*itemSize < sect->size;i++)
4030 // according to otool, reserved1 contains the first index into the indirect symbol table
4031 struct nlist *symbol = &nlist[indirectSyms[sect->reserved1+i]];
4032 char *nm = image + symLC->stroff + symbol->n_un.n_strx;
4035 if((symbol->n_type & N_TYPE) == N_UNDF
4036 && (symbol->n_type & N_EXT) && (symbol->n_value != 0))
4037 addr = (void*) (symbol->n_value);
4039 addr = lookupSymbol(nm);
4042 errorBelch("\n%s: unknown symbol `%s'", oc->fileName, nm);
4050 checkProddableBlock(oc,image + sect->offset + i*itemSize);
4051 *(image + sect->offset + i*itemSize) = 0xe9; // jmp
4052 *(unsigned*)(image + sect->offset + i*itemSize + 1)
4053 = (char*)addr - (image + sect->offset + i*itemSize + 5);
4058 checkProddableBlock(oc,((void**)(image + sect->offset)) + i);
4059 ((void**)(image + sect->offset))[i] = addr;
4066 static unsigned long relocateAddress(
4069 struct section* sections,
4070 unsigned long address)
4073 for(i = 0; i < nSections; i++)
4075 if(sections[i].addr <= address
4076 && address < sections[i].addr + sections[i].size)
4078 return (unsigned long)oc->image
4079 + sections[i].offset + address - sections[i].addr;
4082 barf("Invalid Mach-O file:"
4083 "Address out of bounds while relocating object file");
4087 static int relocateSection(
4090 struct symtab_command *symLC, struct nlist *nlist,
4091 int nSections, struct section* sections, struct section *sect)
4093 struct relocation_info *relocs;
4096 if(!strcmp(sect->sectname,"__la_symbol_ptr"))
4098 else if(!strcmp(sect->sectname,"__nl_symbol_ptr"))
4100 else if(!strcmp(sect->sectname,"__la_sym_ptr2"))
4102 else if(!strcmp(sect->sectname,"__la_sym_ptr3"))
4106 relocs = (struct relocation_info*) (image + sect->reloff);
4110 #ifdef x86_64_HOST_ARCH
4111 struct relocation_info *reloc = &relocs[i];
4113 char *thingPtr = image + sect->offset + reloc->r_address;
4115 /* We shouldn't need to initialise this, but gcc on OS X 64 bit
4116 complains that it may be used uninitialized if we don't */
4119 int type = reloc->r_type;
4121 checkProddableBlock(oc,thingPtr);
4122 switch(reloc->r_length)
4125 thing = *(uint8_t*)thingPtr;
4126 baseValue = (uint64_t)thingPtr + 1;
4129 thing = *(uint16_t*)thingPtr;
4130 baseValue = (uint64_t)thingPtr + 2;
4133 thing = *(uint32_t*)thingPtr;
4134 baseValue = (uint64_t)thingPtr + 4;
4137 thing = *(uint64_t*)thingPtr;
4138 baseValue = (uint64_t)thingPtr + 8;
4141 barf("Unknown size.");
4144 if(type == X86_64_RELOC_GOT
4145 || type == X86_64_RELOC_GOT_LOAD)
4147 ASSERT(reloc->r_extern);
4148 value = (uint64_t) &makeSymbolExtra(oc, reloc->r_symbolnum, value)->addr;
4150 type = X86_64_RELOC_SIGNED;
4152 else if(reloc->r_extern)
4154 struct nlist *symbol = &nlist[reloc->r_symbolnum];
4155 char *nm = image + symLC->stroff + symbol->n_un.n_strx;
4156 if(symbol->n_value == 0)
4157 value = (uint64_t) lookupSymbol(nm);
4159 value = relocateAddress(oc, nSections, sections,
4164 value = sections[reloc->r_symbolnum-1].offset
4165 - sections[reloc->r_symbolnum-1].addr
4169 if(type == X86_64_RELOC_BRANCH)
4171 if((int32_t)(value - baseValue) != (int64_t)(value - baseValue))
4173 ASSERT(reloc->r_extern);
4174 value = (uint64_t) &makeSymbolExtra(oc, reloc->r_symbolnum, value)
4177 ASSERT((int32_t)(value - baseValue) == (int64_t)(value - baseValue));
4178 type = X86_64_RELOC_SIGNED;
4183 case X86_64_RELOC_UNSIGNED:
4184 ASSERT(!reloc->r_pcrel);
4187 case X86_64_RELOC_SIGNED:
4188 ASSERT(reloc->r_pcrel);
4189 thing += value - baseValue;
4191 case X86_64_RELOC_SUBTRACTOR:
4192 ASSERT(!reloc->r_pcrel);
4196 barf("unkown relocation");
4199 switch(reloc->r_length)
4202 *(uint8_t*)thingPtr = thing;
4205 *(uint16_t*)thingPtr = thing;
4208 *(uint32_t*)thingPtr = thing;
4211 *(uint64_t*)thingPtr = thing;
4215 if(relocs[i].r_address & R_SCATTERED)
4217 struct scattered_relocation_info *scat =
4218 (struct scattered_relocation_info*) &relocs[i];
4222 if(scat->r_length == 2)
4224 unsigned long word = 0;
4225 unsigned long* wordPtr = (unsigned long*) (image + sect->offset + scat->r_address);
4226 checkProddableBlock(oc,wordPtr);
4228 // Note on relocation types:
4229 // i386 uses the GENERIC_RELOC_* types,
4230 // while ppc uses special PPC_RELOC_* types.
4231 // *_RELOC_VANILLA and *_RELOC_PAIR have the same value
4232 // in both cases, all others are different.
4233 // Therefore, we use GENERIC_RELOC_VANILLA
4234 // and GENERIC_RELOC_PAIR instead of the PPC variants,
4235 // and use #ifdefs for the other types.
4237 // Step 1: Figure out what the relocated value should be
4238 if(scat->r_type == GENERIC_RELOC_VANILLA)
4240 word = *wordPtr + (unsigned long) relocateAddress(
4247 #ifdef powerpc_HOST_ARCH
4248 else if(scat->r_type == PPC_RELOC_SECTDIFF
4249 || scat->r_type == PPC_RELOC_LO16_SECTDIFF
4250 || scat->r_type == PPC_RELOC_HI16_SECTDIFF
4251 || scat->r_type == PPC_RELOC_HA16_SECTDIFF)
4253 else if(scat->r_type == GENERIC_RELOC_SECTDIFF)
4256 struct scattered_relocation_info *pair =
4257 (struct scattered_relocation_info*) &relocs[i+1];
4259 if(!pair->r_scattered || pair->r_type != GENERIC_RELOC_PAIR)
4260 barf("Invalid Mach-O file: "
4261 "RELOC_*_SECTDIFF not followed by RELOC_PAIR");
4263 word = (unsigned long)
4264 (relocateAddress(oc, nSections, sections, scat->r_value)
4265 - relocateAddress(oc, nSections, sections, pair->r_value));
4268 #ifdef powerpc_HOST_ARCH
4269 else if(scat->r_type == PPC_RELOC_HI16
4270 || scat->r_type == PPC_RELOC_LO16
4271 || scat->r_type == PPC_RELOC_HA16
4272 || scat->r_type == PPC_RELOC_LO14)
4273 { // these are generated by label+offset things
4274 struct relocation_info *pair = &relocs[i+1];
4275 if((pair->r_address & R_SCATTERED) || pair->r_type != PPC_RELOC_PAIR)
4276 barf("Invalid Mach-O file: "
4277 "PPC_RELOC_* not followed by PPC_RELOC_PAIR");
4279 if(scat->r_type == PPC_RELOC_LO16)
4281 word = ((unsigned short*) wordPtr)[1];
4282 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
4284 else if(scat->r_type == PPC_RELOC_LO14)
4286 barf("Unsupported Relocation: PPC_RELOC_LO14");
4287 word = ((unsigned short*) wordPtr)[1] & 0xFFFC;
4288 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
4290 else if(scat->r_type == PPC_RELOC_HI16)
4292 word = ((unsigned short*) wordPtr)[1] << 16;
4293 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF);
4295 else if(scat->r_type == PPC_RELOC_HA16)
4297 word = ((unsigned short*) wordPtr)[1] << 16;
4298 word += ((short)relocs[i+1].r_address & (short)0xFFFF);
4302 word += (unsigned long) relocateAddress(oc, nSections, sections, scat->r_value)
4309 continue; // ignore the others
4311 #ifdef powerpc_HOST_ARCH
4312 if(scat->r_type == GENERIC_RELOC_VANILLA
4313 || scat->r_type == PPC_RELOC_SECTDIFF)
4315 if(scat->r_type == GENERIC_RELOC_VANILLA
4316 || scat->r_type == GENERIC_RELOC_SECTDIFF)
4321 #ifdef powerpc_HOST_ARCH
4322 else if(scat->r_type == PPC_RELOC_LO16_SECTDIFF || scat->r_type == PPC_RELOC_LO16)
4324 ((unsigned short*) wordPtr)[1] = word & 0xFFFF;
4326 else if(scat->r_type == PPC_RELOC_HI16_SECTDIFF || scat->r_type == PPC_RELOC_HI16)
4328 ((unsigned short*) wordPtr)[1] = (word >> 16) & 0xFFFF;
4330 else if(scat->r_type == PPC_RELOC_HA16_SECTDIFF || scat->r_type == PPC_RELOC_HA16)
4332 ((unsigned short*) wordPtr)[1] = ((word >> 16) & 0xFFFF)
4333 + ((word & (1<<15)) ? 1 : 0);
4339 continue; // FIXME: I hope it's OK to ignore all the others.
4343 struct relocation_info *reloc = &relocs[i];
4344 if(reloc->r_pcrel && !reloc->r_extern)
4347 if(reloc->r_length == 2)
4349 unsigned long word = 0;
4350 #ifdef powerpc_HOST_ARCH
4351 unsigned long jumpIsland = 0;
4352 long offsetToJumpIsland = 0xBADBAD42; // initialise to bad value
4353 // to avoid warning and to catch
4357 unsigned long* wordPtr = (unsigned long*) (image + sect->offset + reloc->r_address);
4358 checkProddableBlock(oc,wordPtr);
4360 if(reloc->r_type == GENERIC_RELOC_VANILLA)
4364 #ifdef powerpc_HOST_ARCH
4365 else if(reloc->r_type == PPC_RELOC_LO16)
4367 word = ((unsigned short*) wordPtr)[1];
4368 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
4370 else if(reloc->r_type == PPC_RELOC_HI16)
4372 word = ((unsigned short*) wordPtr)[1] << 16;
4373 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF);
4375 else if(reloc->r_type == PPC_RELOC_HA16)
4377 word = ((unsigned short*) wordPtr)[1] << 16;
4378 word += ((short)relocs[i+1].r_address & (short)0xFFFF);
4380 else if(reloc->r_type == PPC_RELOC_BR24)
4383 word = (word & 0x03FFFFFC) | ((word & 0x02000000) ? 0xFC000000 : 0);
4387 if(!reloc->r_extern)
4390 sections[reloc->r_symbolnum-1].offset
4391 - sections[reloc->r_symbolnum-1].addr
4398 struct nlist *symbol = &nlist[reloc->r_symbolnum];
4399 char *nm = image + symLC->stroff + symbol->n_un.n_strx;
4400 void *symbolAddress = lookupSymbol(nm);
4403 errorBelch("\nunknown symbol `%s'", nm);
4409 #ifdef powerpc_HOST_ARCH
4410 // In the .o file, this should be a relative jump to NULL
4411 // and we'll change it to a relative jump to the symbol
4412 ASSERT(word + reloc->r_address == 0);
4413 jumpIsland = (unsigned long)
4414 &makeSymbolExtra(oc,
4416 (unsigned long) symbolAddress)
4420 offsetToJumpIsland = word + jumpIsland
4421 - (((long)image) + sect->offset - sect->addr);
4424 word += (unsigned long) symbolAddress
4425 - (((long)image) + sect->offset - sect->addr);
4429 word += (unsigned long) symbolAddress;
4433 if(reloc->r_type == GENERIC_RELOC_VANILLA)
4438 #ifdef powerpc_HOST_ARCH
4439 else if(reloc->r_type == PPC_RELOC_LO16)
4441 ((unsigned short*) wordPtr)[1] = word & 0xFFFF;
4444 else if(reloc->r_type == PPC_RELOC_HI16)
4446 ((unsigned short*) wordPtr)[1] = (word >> 16) & 0xFFFF;
4449 else if(reloc->r_type == PPC_RELOC_HA16)
4451 ((unsigned short*) wordPtr)[1] = ((word >> 16) & 0xFFFF)
4452 + ((word & (1<<15)) ? 1 : 0);
4455 else if(reloc->r_type == PPC_RELOC_BR24)
4457 if((long)word > (long)0x01FFFFFF || (long)word < (long)0xFFE00000)
4459 // The branch offset is too large.
4460 // Therefore, we try to use a jump island.
4463 barf("unconditional relative branch out of range: "
4464 "no jump island available");
4467 word = offsetToJumpIsland;
4468 if((long)word > (long)0x01FFFFFF || (long)word < (long)0xFFE00000)
4469 barf("unconditional relative branch out of range: "
4470 "jump island out of range");
4472 *wordPtr = (*wordPtr & 0xFC000003) | (word & 0x03FFFFFC);
4477 barf("\nunknown relocation %d",reloc->r_type);
4485 static int ocGetNames_MachO(ObjectCode* oc)
4487 char *image = (char*) oc->image;
4488 struct mach_header *header = (struct mach_header*) image;
4489 struct load_command *lc = (struct load_command*) (image + sizeof(struct mach_header));
4490 unsigned i,curSymbol = 0;
4491 struct segment_command *segLC = NULL;
4492 struct section *sections;
4493 struct symtab_command *symLC = NULL;
4494 struct nlist *nlist;
4495 unsigned long commonSize = 0;
4496 char *commonStorage = NULL;
4497 unsigned long commonCounter;
4499 for(i=0;i<header->ncmds;i++)
4501 if(lc->cmd == LC_SEGMENT || lc->cmd == LC_SEGMENT_64)
4502 segLC = (struct segment_command*) lc;
4503 else if(lc->cmd == LC_SYMTAB)
4504 symLC = (struct symtab_command*) lc;
4505 lc = (struct load_command *) ( ((char*)lc) + lc->cmdsize );
4508 sections = (struct section*) (segLC+1);
4509 nlist = symLC ? (struct nlist*) (image + symLC->symoff)
4513 barf("ocGetNames_MachO: no segment load command");
4515 for(i=0;i<segLC->nsects;i++)
4517 if(sections[i].size == 0)
4520 if((sections[i].flags & SECTION_TYPE) == S_ZEROFILL)
4522 char * zeroFillArea = stgCallocBytes(1,sections[i].size,
4523 "ocGetNames_MachO(common symbols)");
4524 sections[i].offset = zeroFillArea - image;
4527 if(!strcmp(sections[i].sectname,"__text"))
4528 addSection(oc, SECTIONKIND_CODE_OR_RODATA,
4529 (void*) (image + sections[i].offset),
4530 (void*) (image + sections[i].offset + sections[i].size));
4531 else if(!strcmp(sections[i].sectname,"__const"))
4532 addSection(oc, SECTIONKIND_RWDATA,
4533 (void*) (image + sections[i].offset),
4534 (void*) (image + sections[i].offset + sections[i].size));
4535 else if(!strcmp(sections[i].sectname,"__data"))
4536 addSection(oc, SECTIONKIND_RWDATA,
4537 (void*) (image + sections[i].offset),
4538 (void*) (image + sections[i].offset + sections[i].size));
4539 else if(!strcmp(sections[i].sectname,"__bss")
4540 || !strcmp(sections[i].sectname,"__common"))
4541 addSection(oc, SECTIONKIND_RWDATA,
4542 (void*) (image + sections[i].offset),
4543 (void*) (image + sections[i].offset + sections[i].size));
4545 addProddableBlock(oc, (void*) (image + sections[i].offset),
4549 // count external symbols defined here
4553 for(i=0;i<symLC->nsyms;i++)
4555 if(nlist[i].n_type & N_STAB)
4557 else if(nlist[i].n_type & N_EXT)
4559 if((nlist[i].n_type & N_TYPE) == N_UNDF
4560 && (nlist[i].n_value != 0))
4562 commonSize += nlist[i].n_value;
4565 else if((nlist[i].n_type & N_TYPE) == N_SECT)
4570 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
4571 "ocGetNames_MachO(oc->symbols)");
4575 for(i=0;i<symLC->nsyms;i++)
4577 if(nlist[i].n_type & N_STAB)
4579 else if((nlist[i].n_type & N_TYPE) == N_SECT)
4581 if(nlist[i].n_type & N_EXT)
4583 char *nm = image + symLC->stroff + nlist[i].n_un.n_strx;
4584 if((nlist[i].n_desc & N_WEAK_DEF) && lookupSymbol(nm))
4585 ; // weak definition, and we already have a definition
4588 ghciInsertStrHashTable(oc->fileName, symhash, nm,
4590 + sections[nlist[i].n_sect-1].offset
4591 - sections[nlist[i].n_sect-1].addr
4592 + nlist[i].n_value);
4593 oc->symbols[curSymbol++] = nm;
4600 commonStorage = stgCallocBytes(1,commonSize,"ocGetNames_MachO(common symbols)");
4601 commonCounter = (unsigned long)commonStorage;
4604 for(i=0;i<symLC->nsyms;i++)
4606 if((nlist[i].n_type & N_TYPE) == N_UNDF
4607 && (nlist[i].n_type & N_EXT) && (nlist[i].n_value != 0))
4609 char *nm = image + symLC->stroff + nlist[i].n_un.n_strx;
4610 unsigned long sz = nlist[i].n_value;
4612 nlist[i].n_value = commonCounter;
4614 ghciInsertStrHashTable(oc->fileName, symhash, nm,
4615 (void*)commonCounter);
4616 oc->symbols[curSymbol++] = nm;
4618 commonCounter += sz;
4625 static int ocResolve_MachO(ObjectCode* oc)
4627 char *image = (char*) oc->image;
4628 struct mach_header *header = (struct mach_header*) image;
4629 struct load_command *lc = (struct load_command*) (image + sizeof(struct mach_header));
4631 struct segment_command *segLC = NULL;
4632 struct section *sections;
4633 struct symtab_command *symLC = NULL;
4634 struct dysymtab_command *dsymLC = NULL;
4635 struct nlist *nlist;
4637 for(i=0;i<header->ncmds;i++)
4639 if(lc->cmd == LC_SEGMENT || lc->cmd == LC_SEGMENT_64)
4640 segLC = (struct segment_command*) lc;
4641 else if(lc->cmd == LC_SYMTAB)
4642 symLC = (struct symtab_command*) lc;
4643 else if(lc->cmd == LC_DYSYMTAB)
4644 dsymLC = (struct dysymtab_command*) lc;
4645 lc = (struct load_command *) ( ((char*)lc) + lc->cmdsize );
4648 sections = (struct section*) (segLC+1);
4649 nlist = symLC ? (struct nlist*) (image + symLC->symoff)
4654 unsigned long *indirectSyms
4655 = (unsigned long*) (image + dsymLC->indirectsymoff);
4657 for(i=0;i<segLC->nsects;i++)
4659 if( !strcmp(sections[i].sectname,"__la_symbol_ptr")
4660 || !strcmp(sections[i].sectname,"__la_sym_ptr2")
4661 || !strcmp(sections[i].sectname,"__la_sym_ptr3"))
4663 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4666 else if(!strcmp(sections[i].sectname,"__nl_symbol_ptr")
4667 || !strcmp(sections[i].sectname,"__pointers"))
4669 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4672 else if(!strcmp(sections[i].sectname,"__jump_table"))
4674 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4680 for(i=0;i<segLC->nsects;i++)
4682 if(!relocateSection(oc,image,symLC,nlist,segLC->nsects,sections,§ions[i]))
4686 #if defined (powerpc_HOST_ARCH)
4687 ocFlushInstructionCache( oc );
4693 #ifdef powerpc_HOST_ARCH
4695 * The Mach-O object format uses leading underscores. But not everywhere.
4696 * There is a small number of runtime support functions defined in
4697 * libcc_dynamic.a whose name does not have a leading underscore.
4698 * As a consequence, we can't get their address from C code.
4699 * We have to use inline assembler just to take the address of a function.
4703 static void machoInitSymbolsWithoutUnderscore()
4705 extern void* symbolsWithoutUnderscore[];
4706 void **p = symbolsWithoutUnderscore;
4707 __asm__ volatile(".globl _symbolsWithoutUnderscore\n.data\n_symbolsWithoutUnderscore:");
4709 #undef SymI_NeedsProto
4710 #define SymI_NeedsProto(x) \
4711 __asm__ volatile(".long " # x);
4713 RTS_MACHO_NOUNDERLINE_SYMBOLS
4715 __asm__ volatile(".text");
4717 #undef SymI_NeedsProto
4718 #define SymI_NeedsProto(x) \
4719 ghciInsertStrHashTable("(GHCi built-in symbols)", symhash, #x, *p++);
4721 RTS_MACHO_NOUNDERLINE_SYMBOLS
4723 #undef SymI_NeedsProto
4728 * Figure out by how much to shift the entire Mach-O file in memory
4729 * when loading so that its single segment ends up 16-byte-aligned
4731 static int machoGetMisalignment( FILE * f )
4733 struct mach_header header;
4736 fread(&header, sizeof(header), 1, f);
4739 #if x86_64_TARGET_ARCH || powerpc64_TARGET_ARCH
4740 if(header.magic != MH_MAGIC_64)
4743 if(header.magic != MH_MAGIC)
4747 misalignment = (header.sizeofcmds + sizeof(header))
4750 return misalignment ? (16 - misalignment) : 0;