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"
30 #ifdef HAVE_SYS_TYPES_H
31 #include <sys/types.h>
37 #ifdef HAVE_SYS_STAT_H
41 #if defined(HAVE_DLFCN_H)
45 #if defined(cygwin32_HOST_OS)
50 #ifdef HAVE_SYS_TIME_H
54 #include <sys/fcntl.h>
55 #include <sys/termios.h>
56 #include <sys/utime.h>
57 #include <sys/utsname.h>
61 #if defined(ia64_HOST_ARCH) || defined(openbsd_HOST_OS) || defined(linux_HOST_OS) || defined(freebsd_HOST_OS)
66 #if defined(openbsd_HOST_OS) || defined(linux_HOST_OS) || defined(freebsd_HOST_OS)
74 #if defined(linux_HOST_OS) || defined(solaris2_HOST_OS) || defined(freebsd_HOST_OS) || defined(netbsd_HOST_OS) || defined(openbsd_HOST_OS)
75 # define OBJFORMAT_ELF
76 #elif defined(cygwin32_HOST_OS) || defined (mingw32_HOST_OS)
77 # define OBJFORMAT_PEi386
80 #elif defined(darwin_HOST_OS)
81 # define OBJFORMAT_MACHO
82 # include <mach-o/loader.h>
83 # include <mach-o/nlist.h>
84 # include <mach-o/reloc.h>
85 # include <mach-o/dyld.h>
86 #if defined(powerpc_HOST_ARCH)
87 # include <mach-o/ppc/reloc.h>
91 /* Hash table mapping symbol names to Symbol */
92 static /*Str*/HashTable *symhash;
94 /* List of currently loaded objects */
95 ObjectCode *objects = NULL; /* initially empty */
97 #if defined(OBJFORMAT_ELF)
98 static int ocVerifyImage_ELF ( ObjectCode* oc );
99 static int ocGetNames_ELF ( ObjectCode* oc );
100 static int ocResolve_ELF ( ObjectCode* oc );
101 #if defined(powerpc_HOST_ARCH)
102 static int ocAllocateJumpIslands_ELF ( ObjectCode* oc );
104 #elif defined(OBJFORMAT_PEi386)
105 static int ocVerifyImage_PEi386 ( ObjectCode* oc );
106 static int ocGetNames_PEi386 ( ObjectCode* oc );
107 static int ocResolve_PEi386 ( ObjectCode* oc );
108 #elif defined(OBJFORMAT_MACHO)
109 static int ocVerifyImage_MachO ( ObjectCode* oc );
110 static int ocGetNames_MachO ( ObjectCode* oc );
111 static int ocResolve_MachO ( ObjectCode* oc );
113 static int machoGetMisalignment( FILE * );
114 #ifdef powerpc_HOST_ARCH
115 static int ocAllocateJumpIslands_MachO ( ObjectCode* oc );
116 static void machoInitSymbolsWithoutUnderscore( void );
120 #if defined(x86_64_HOST_ARCH)
121 static void*x86_64_high_symbol( char *lbl, void *addr );
124 /* -----------------------------------------------------------------------------
125 * Built-in symbols from the RTS
128 typedef struct _RtsSymbolVal {
135 #define Maybe_Stable_Names SymX(mkWeakzh_fast) \
136 SymX(makeStableNamezh_fast) \
137 SymX(finalizzeWeakzh_fast)
139 /* These are not available in GUM!!! -- HWL */
140 #define Maybe_Stable_Names
143 #if !defined (mingw32_HOST_OS)
144 #define RTS_POSIX_ONLY_SYMBOLS \
145 SymX(signal_handlers) \
146 SymX(stg_sig_install) \
150 #if defined (cygwin32_HOST_OS)
151 #define RTS_MINGW_ONLY_SYMBOLS /**/
152 /* Don't have the ability to read import libs / archives, so
153 * we have to stupidly list a lot of what libcygwin.a
156 #define RTS_CYGWIN_ONLY_SYMBOLS \
234 #elif !defined(mingw32_HOST_OS)
235 #define RTS_MINGW_ONLY_SYMBOLS /**/
236 #define RTS_CYGWIN_ONLY_SYMBOLS /**/
237 #else /* defined(mingw32_HOST_OS) */
238 #define RTS_POSIX_ONLY_SYMBOLS /**/
239 #define RTS_CYGWIN_ONLY_SYMBOLS /**/
241 /* Extra syms gen'ed by mingw-2's gcc-3.2: */
243 #define RTS_MINGW_EXTRA_SYMS \
244 Sym(_imp____mb_cur_max) \
247 #define RTS_MINGW_EXTRA_SYMS
250 /* These are statically linked from the mingw libraries into the ghc
251 executable, so we have to employ this hack. */
252 #define RTS_MINGW_ONLY_SYMBOLS \
253 SymX(asyncReadzh_fast) \
254 SymX(asyncWritezh_fast) \
255 SymX(asyncDoProczh_fast) \
267 SymX(getservbyname) \
268 SymX(getservbyport) \
269 SymX(getprotobynumber) \
270 SymX(getprotobyname) \
271 SymX(gethostbyname) \
272 SymX(gethostbyaddr) \
306 SymX(rts_InstallConsoleEvent) \
307 SymX(rts_ConsoleHandlerDone) \
309 Sym(_imp___timezone) \
318 RTS_MINGW_EXTRA_SYMS \
322 #if defined(darwin_TARGET_OS) && HAVE_PRINTF_LDBLSTUB
323 #define RTS_DARWIN_ONLY_SYMBOLS \
324 Sym(asprintf$LDBLStub) \
328 Sym(fprintf$LDBLStub) \
329 Sym(fscanf$LDBLStub) \
330 Sym(fwprintf$LDBLStub) \
331 Sym(fwscanf$LDBLStub) \
332 Sym(printf$LDBLStub) \
333 Sym(scanf$LDBLStub) \
334 Sym(snprintf$LDBLStub) \
335 Sym(sprintf$LDBLStub) \
336 Sym(sscanf$LDBLStub) \
337 Sym(strtold$LDBLStub) \
338 Sym(swprintf$LDBLStub) \
339 Sym(swscanf$LDBLStub) \
340 Sym(syslog$LDBLStub) \
341 Sym(vasprintf$LDBLStub) \
343 Sym(verrc$LDBLStub) \
344 Sym(verrx$LDBLStub) \
345 Sym(vfprintf$LDBLStub) \
346 Sym(vfscanf$LDBLStub) \
347 Sym(vfwprintf$LDBLStub) \
348 Sym(vfwscanf$LDBLStub) \
349 Sym(vprintf$LDBLStub) \
350 Sym(vscanf$LDBLStub) \
351 Sym(vsnprintf$LDBLStub) \
352 Sym(vsprintf$LDBLStub) \
353 Sym(vsscanf$LDBLStub) \
354 Sym(vswprintf$LDBLStub) \
355 Sym(vswscanf$LDBLStub) \
356 Sym(vsyslog$LDBLStub) \
357 Sym(vwarn$LDBLStub) \
358 Sym(vwarnc$LDBLStub) \
359 Sym(vwarnx$LDBLStub) \
360 Sym(vwprintf$LDBLStub) \
361 Sym(vwscanf$LDBLStub) \
363 Sym(warnc$LDBLStub) \
364 Sym(warnx$LDBLStub) \
365 Sym(wcstold$LDBLStub) \
366 Sym(wprintf$LDBLStub) \
369 #define RTS_DARWIN_ONLY_SYMBOLS
373 # define MAIN_CAP_SYM SymX(MainCapability)
375 # define MAIN_CAP_SYM
378 #if !defined(mingw32_HOST_OS)
379 #define RTS_USER_SIGNALS_SYMBOLS \
380 SymX(setIOManagerPipe)
382 #define RTS_USER_SIGNALS_SYMBOLS /* nothing */
385 #ifdef TABLES_NEXT_TO_CODE
386 #define RTS_RET_SYMBOLS /* nothing */
388 #define RTS_RET_SYMBOLS \
389 SymX(stg_enter_ret) \
390 SymX(stg_gc_fun_ret) \
398 SymX(stg_ap_pv_ret) \
399 SymX(stg_ap_pp_ret) \
400 SymX(stg_ap_ppv_ret) \
401 SymX(stg_ap_ppp_ret) \
402 SymX(stg_ap_pppv_ret) \
403 SymX(stg_ap_pppp_ret) \
404 SymX(stg_ap_ppppp_ret) \
405 SymX(stg_ap_pppppp_ret)
408 #define RTS_SYMBOLS \
411 SymX(stg_enter_info) \
412 SymX(stg_gc_void_info) \
413 SymX(__stg_gc_enter_1) \
414 SymX(stg_gc_noregs) \
415 SymX(stg_gc_unpt_r1_info) \
416 SymX(stg_gc_unpt_r1) \
417 SymX(stg_gc_unbx_r1_info) \
418 SymX(stg_gc_unbx_r1) \
419 SymX(stg_gc_f1_info) \
421 SymX(stg_gc_d1_info) \
423 SymX(stg_gc_l1_info) \
426 SymX(stg_gc_fun_info) \
428 SymX(stg_gc_gen_info) \
429 SymX(stg_gc_gen_hp) \
431 SymX(stg_gen_yield) \
432 SymX(stg_yield_noregs) \
433 SymX(stg_yield_to_interpreter) \
434 SymX(stg_gen_block) \
435 SymX(stg_block_noregs) \
437 SymX(stg_block_takemvar) \
438 SymX(stg_block_putmvar) \
439 SymX(stg_seq_frame_info) \
441 SymX(MallocFailHook) \
443 SymX(OutOfHeapHook) \
444 SymX(StackOverflowHook) \
445 SymX(__encodeDouble) \
446 SymX(__encodeFloat) \
450 SymX(__gmpz_cmp_si) \
451 SymX(__gmpz_cmp_ui) \
452 SymX(__gmpz_get_si) \
453 SymX(__gmpz_get_ui) \
454 SymX(__int_encodeDouble) \
455 SymX(__int_encodeFloat) \
456 SymX(andIntegerzh_fast) \
457 SymX(atomicallyzh_fast) \
461 SymX(blockAsyncExceptionszh_fast) \
463 SymX(catchRetryzh_fast) \
464 SymX(catchSTMzh_fast) \
465 SymX(closure_flags) \
467 SymX(cmpIntegerzh_fast) \
468 SymX(cmpIntegerIntzh_fast) \
469 SymX(complementIntegerzh_fast) \
470 SymX(createAdjustor) \
471 SymX(decodeDoublezh_fast) \
472 SymX(decodeFloatzh_fast) \
475 SymX(deRefWeakzh_fast) \
476 SymX(deRefStablePtrzh_fast) \
477 SymX(dirty_MUT_VAR) \
478 SymX(divExactIntegerzh_fast) \
479 SymX(divModIntegerzh_fast) \
482 SymX(forkOS_createThread) \
483 SymX(freeHaskellFunctionPtr) \
484 SymX(freeStablePtr) \
485 SymX(gcdIntegerzh_fast) \
486 SymX(gcdIntegerIntzh_fast) \
487 SymX(gcdIntzh_fast) \
496 SymX(hs_perform_gc) \
497 SymX(hs_free_stable_ptr) \
498 SymX(hs_free_fun_ptr) \
500 SymX(int2Integerzh_fast) \
501 SymX(integer2Intzh_fast) \
502 SymX(integer2Wordzh_fast) \
503 SymX(isCurrentThreadBoundzh_fast) \
504 SymX(isDoubleDenormalized) \
505 SymX(isDoubleInfinite) \
507 SymX(isDoubleNegativeZero) \
508 SymX(isEmptyMVarzh_fast) \
509 SymX(isFloatDenormalized) \
510 SymX(isFloatInfinite) \
512 SymX(isFloatNegativeZero) \
513 SymX(killThreadzh_fast) \
516 SymX(makeStablePtrzh_fast) \
517 SymX(minusIntegerzh_fast) \
518 SymX(mkApUpd0zh_fast) \
519 SymX(myThreadIdzh_fast) \
520 SymX(labelThreadzh_fast) \
521 SymX(newArrayzh_fast) \
522 SymX(newBCOzh_fast) \
523 SymX(newByteArrayzh_fast) \
524 SymX_redirect(newCAF, newDynCAF) \
525 SymX(newMVarzh_fast) \
526 SymX(newMutVarzh_fast) \
527 SymX(newTVarzh_fast) \
528 SymX(atomicModifyMutVarzh_fast) \
529 SymX(newPinnedByteArrayzh_fast) \
530 SymX(orIntegerzh_fast) \
532 SymX(performMajorGC) \
533 SymX(plusIntegerzh_fast) \
536 SymX(putMVarzh_fast) \
537 SymX(quotIntegerzh_fast) \
538 SymX(quotRemIntegerzh_fast) \
540 SymX(raiseIOzh_fast) \
541 SymX(readTVarzh_fast) \
542 SymX(remIntegerzh_fast) \
543 SymX(resetNonBlockingFd) \
548 SymX(rts_checkSchedStatus) \
551 SymX(rts_evalLazyIO) \
552 SymX(rts_evalStableIO) \
556 SymX(rts_getDouble) \
561 SymX(rts_getFunPtr) \
562 SymX(rts_getStablePtr) \
563 SymX(rts_getThreadId) \
565 SymX(rts_getWord32) \
578 SymX(rts_mkStablePtr) \
586 SymX(rtsSupportsBoundThreads) \
587 SymX(__hscore_get_saved_termios) \
588 SymX(__hscore_set_saved_termios) \
590 SymX(startupHaskell) \
591 SymX(shutdownHaskell) \
592 SymX(shutdownHaskellAndExit) \
593 SymX(stable_ptr_table) \
594 SymX(stackOverflow) \
595 SymX(stg_CAF_BLACKHOLE_info) \
596 SymX(awakenBlockedQueue) \
597 SymX(stg_CHARLIKE_closure) \
598 SymX(stg_EMPTY_MVAR_info) \
599 SymX(stg_IND_STATIC_info) \
600 SymX(stg_INTLIKE_closure) \
601 SymX(stg_MUT_ARR_PTRS_DIRTY_info) \
602 SymX(stg_MUT_ARR_PTRS_FROZEN_info) \
603 SymX(stg_MUT_ARR_PTRS_FROZEN0_info) \
604 SymX(stg_WEAK_info) \
605 SymX(stg_ap_0_info) \
606 SymX(stg_ap_v_info) \
607 SymX(stg_ap_f_info) \
608 SymX(stg_ap_d_info) \
609 SymX(stg_ap_l_info) \
610 SymX(stg_ap_n_info) \
611 SymX(stg_ap_p_info) \
612 SymX(stg_ap_pv_info) \
613 SymX(stg_ap_pp_info) \
614 SymX(stg_ap_ppv_info) \
615 SymX(stg_ap_ppp_info) \
616 SymX(stg_ap_pppv_info) \
617 SymX(stg_ap_pppp_info) \
618 SymX(stg_ap_ppppp_info) \
619 SymX(stg_ap_pppppp_info) \
620 SymX(stg_ap_1_upd_info) \
621 SymX(stg_ap_2_upd_info) \
622 SymX(stg_ap_3_upd_info) \
623 SymX(stg_ap_4_upd_info) \
624 SymX(stg_ap_5_upd_info) \
625 SymX(stg_ap_6_upd_info) \
626 SymX(stg_ap_7_upd_info) \
628 SymX(stg_sel_0_upd_info) \
629 SymX(stg_sel_10_upd_info) \
630 SymX(stg_sel_11_upd_info) \
631 SymX(stg_sel_12_upd_info) \
632 SymX(stg_sel_13_upd_info) \
633 SymX(stg_sel_14_upd_info) \
634 SymX(stg_sel_15_upd_info) \
635 SymX(stg_sel_1_upd_info) \
636 SymX(stg_sel_2_upd_info) \
637 SymX(stg_sel_3_upd_info) \
638 SymX(stg_sel_4_upd_info) \
639 SymX(stg_sel_5_upd_info) \
640 SymX(stg_sel_6_upd_info) \
641 SymX(stg_sel_7_upd_info) \
642 SymX(stg_sel_8_upd_info) \
643 SymX(stg_sel_9_upd_info) \
644 SymX(stg_upd_frame_info) \
645 SymX(suspendThread) \
646 SymX(takeMVarzh_fast) \
647 SymX(timesIntegerzh_fast) \
648 SymX(tryPutMVarzh_fast) \
649 SymX(tryTakeMVarzh_fast) \
650 SymX(unblockAsyncExceptionszh_fast) \
652 SymX(unsafeThawArrayzh_fast) \
653 SymX(waitReadzh_fast) \
654 SymX(waitWritezh_fast) \
655 SymX(word2Integerzh_fast) \
656 SymX(writeTVarzh_fast) \
657 SymX(xorIntegerzh_fast) \
659 RTS_USER_SIGNALS_SYMBOLS
661 #ifdef SUPPORT_LONG_LONGS
662 #define RTS_LONG_LONG_SYMS \
663 SymX(int64ToIntegerzh_fast) \
664 SymX(word64ToIntegerzh_fast)
666 #define RTS_LONG_LONG_SYMS /* nothing */
669 // 64-bit support functions in libgcc.a
670 #if defined(__GNUC__) && SIZEOF_VOID_P <= 4
671 #define RTS_LIBGCC_SYMBOLS \
681 #elif defined(ia64_HOST_ARCH)
682 #define RTS_LIBGCC_SYMBOLS \
690 #define RTS_LIBGCC_SYMBOLS
693 #if defined(darwin_HOST_OS) && defined(powerpc_HOST_ARCH)
694 // Symbols that don't have a leading underscore
695 // on Mac OS X. They have to receive special treatment,
696 // see machoInitSymbolsWithoutUnderscore()
697 #define RTS_MACHO_NOUNDERLINE_SYMBOLS \
702 /* entirely bogus claims about types of these symbols */
703 #define Sym(vvv) extern void vvv(void);
704 #define SymX(vvv) /**/
705 #define SymX_redirect(vvv,xxx) /**/
709 RTS_POSIX_ONLY_SYMBOLS
710 RTS_MINGW_ONLY_SYMBOLS
711 RTS_CYGWIN_ONLY_SYMBOLS
712 RTS_DARWIN_ONLY_SYMBOLS
718 #ifdef LEADING_UNDERSCORE
719 #define MAYBE_LEADING_UNDERSCORE_STR(s) ("_" s)
721 #define MAYBE_LEADING_UNDERSCORE_STR(s) (s)
724 #define Sym(vvv) { MAYBE_LEADING_UNDERSCORE_STR(#vvv), \
726 #define SymX(vvv) Sym(vvv)
728 // SymX_redirect allows us to redirect references to one symbol to
729 // another symbol. See newCAF/newDynCAF for an example.
730 #define SymX_redirect(vvv,xxx) \
731 { MAYBE_LEADING_UNDERSCORE_STR(#vvv), \
734 static RtsSymbolVal rtsSyms[] = {
738 RTS_POSIX_ONLY_SYMBOLS
739 RTS_MINGW_ONLY_SYMBOLS
740 RTS_CYGWIN_ONLY_SYMBOLS
742 #if defined(darwin_HOST_OS) && defined(i386_HOST_ARCH)
743 // dyld stub code contains references to this,
744 // but it should never be called because we treat
745 // lazy pointers as nonlazy.
746 { "dyld_stub_binding_helper", (void*)0xDEADBEEF },
748 { 0, 0 } /* sentinel */
751 /* -----------------------------------------------------------------------------
752 * Insert symbols into hash tables, checking for duplicates.
754 static void ghciInsertStrHashTable ( char* obj_name,
760 if (lookupHashTable(table, (StgWord)key) == NULL)
762 insertStrHashTable(table, (StgWord)key, data);
767 "GHCi runtime linker: fatal error: I found a duplicate definition for symbol\n"
769 "whilst processing object file\n"
771 "This could be caused by:\n"
772 " * Loading two different object files which export the same symbol\n"
773 " * Specifying the same object file twice on the GHCi command line\n"
774 " * An incorrect `package.conf' entry, causing some object to be\n"
776 "GHCi cannot safely continue in this situation. Exiting now. Sorry.\n"
785 /* -----------------------------------------------------------------------------
786 * initialize the object linker
790 static int linker_init_done = 0 ;
792 #if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
793 static void *dl_prog_handle;
796 /* dlopen(NULL,..) doesn't work so we grab libc explicitly */
797 #if defined(openbsd_HOST_OS)
798 static void *dl_libc_handle;
806 /* Make initLinker idempotent, so we can call it
807 before evey relevant operation; that means we
808 don't need to initialise the linker separately */
809 if (linker_init_done == 1) { return; } else {
810 linker_init_done = 1;
813 symhash = allocStrHashTable();
815 /* populate the symbol table with stuff from the RTS */
816 for (sym = rtsSyms; sym->lbl != NULL; sym++) {
817 ghciInsertStrHashTable("(GHCi built-in symbols)",
818 symhash, sym->lbl, sym->addr);
820 # if defined(OBJFORMAT_MACHO) && defined(powerpc_HOST_ARCH)
821 machoInitSymbolsWithoutUnderscore();
824 # if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
825 # if defined(RTLD_DEFAULT)
826 dl_prog_handle = RTLD_DEFAULT;
828 dl_prog_handle = dlopen(NULL, RTLD_LAZY);
829 # if defined(openbsd_HOST_OS)
830 dl_libc_handle = dlopen("libc.so", RTLD_LAZY);
832 # endif /* RTLD_DEFAULT */
836 /* -----------------------------------------------------------------------------
837 * Loading DLL or .so dynamic libraries
838 * -----------------------------------------------------------------------------
840 * Add a DLL from which symbols may be found. In the ELF case, just
841 * do RTLD_GLOBAL-style add, so no further messing around needs to
842 * happen in order that symbols in the loaded .so are findable --
843 * lookupSymbol() will subsequently see them by dlsym on the program's
844 * dl-handle. Returns NULL if success, otherwise ptr to an err msg.
846 * In the PEi386 case, open the DLLs and put handles to them in a
847 * linked list. When looking for a symbol, try all handles in the
848 * list. This means that we need to load even DLLs that are guaranteed
849 * to be in the ghc.exe image already, just so we can get a handle
850 * to give to loadSymbol, so that we can find the symbols. For such
851 * libraries, the LoadLibrary call should be a no-op except for returning
856 #if defined(OBJFORMAT_PEi386)
857 /* A record for storing handles into DLLs. */
862 struct _OpenedDLL* next;
867 /* A list thereof. */
868 static OpenedDLL* opened_dlls = NULL;
872 addDLL( char *dll_name )
874 # if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
875 /* ------------------- ELF DLL loader ------------------- */
881 hdl= dlopen(dll_name, RTLD_NOW | RTLD_GLOBAL);
884 /* dlopen failed; return a ptr to the error msg. */
886 if (errmsg == NULL) errmsg = "addDLL: unknown error";
893 # elif defined(OBJFORMAT_PEi386)
894 /* ------------------- Win32 DLL loader ------------------- */
902 /* debugBelch("\naddDLL; dll_name = `%s'\n", dll_name); */
904 /* See if we've already got it, and ignore if so. */
905 for (o_dll = opened_dlls; o_dll != NULL; o_dll = o_dll->next) {
906 if (0 == strcmp(o_dll->name, dll_name))
910 /* The file name has no suffix (yet) so that we can try
911 both foo.dll and foo.drv
913 The documentation for LoadLibrary says:
914 If no file name extension is specified in the lpFileName
915 parameter, the default library extension .dll is
916 appended. However, the file name string can include a trailing
917 point character (.) to indicate that the module name has no
920 buf = stgMallocBytes(strlen(dll_name) + 10, "addDLL");
921 sprintf(buf, "%s.DLL", dll_name);
922 instance = LoadLibrary(buf);
923 if (instance == NULL) {
924 sprintf(buf, "%s.DRV", dll_name); // KAA: allow loading of drivers (like winspool.drv)
925 instance = LoadLibrary(buf);
926 if (instance == NULL) {
929 /* LoadLibrary failed; return a ptr to the error msg. */
930 return "addDLL: unknown error";
935 /* Add this DLL to the list of DLLs in which to search for symbols. */
936 o_dll = stgMallocBytes( sizeof(OpenedDLL), "addDLL" );
937 o_dll->name = stgMallocBytes(1+strlen(dll_name), "addDLL");
938 strcpy(o_dll->name, dll_name);
939 o_dll->instance = instance;
940 o_dll->next = opened_dlls;
945 barf("addDLL: not implemented on this platform");
949 /* -----------------------------------------------------------------------------
950 * lookup a symbol in the hash table
953 lookupSymbol( char *lbl )
957 ASSERT(symhash != NULL);
958 val = lookupStrHashTable(symhash, lbl);
961 # if defined(OBJFORMAT_ELF)
962 # if defined(openbsd_HOST_OS)
963 val = dlsym(dl_prog_handle, lbl);
964 return (val != NULL) ? val : dlsym(dl_libc_handle,lbl);
965 # elif defined(x86_64_HOST_ARCH)
966 val = dlsym(dl_prog_handle, lbl);
967 if (val >= (void *)0x80000000) {
969 new_val = x86_64_high_symbol(lbl, val);
970 IF_DEBUG(linker,debugBelch("lookupSymbol: relocating out of range symbol: %s = %p, now %p\n", lbl, val, new_val));
975 # else /* not openbsd */
976 return dlsym(dl_prog_handle, lbl);
978 # elif defined(OBJFORMAT_MACHO)
979 if(NSIsSymbolNameDefined(lbl)) {
980 NSSymbol symbol = NSLookupAndBindSymbol(lbl);
981 return NSAddressOfSymbol(symbol);
985 # elif defined(OBJFORMAT_PEi386)
988 for (o_dll = opened_dlls; o_dll != NULL; o_dll = o_dll->next) {
989 /* debugBelch("look in %s for %s\n", o_dll->name, lbl); */
991 /* HACK: if the name has an initial underscore, try stripping
992 it off & look that up first. I've yet to verify whether there's
993 a Rule that governs whether an initial '_' *should always* be
994 stripped off when mapping from import lib name to the DLL name.
996 sym = GetProcAddress(o_dll->instance, (lbl+1));
998 /*debugBelch("found %s in %s\n", lbl+1,o_dll->name);*/
1002 sym = GetProcAddress(o_dll->instance, lbl);
1004 /*debugBelch("found %s in %s\n", lbl,o_dll->name);*/
1019 __attribute((unused))
1021 lookupLocalSymbol( ObjectCode* oc, char *lbl )
1025 val = lookupStrHashTable(oc->lochash, lbl);
1035 /* -----------------------------------------------------------------------------
1036 * Debugging aid: look in GHCi's object symbol tables for symbols
1037 * within DELTA bytes of the specified address, and show their names.
1040 void ghci_enquire ( char* addr );
1042 void ghci_enquire ( char* addr )
1047 const int DELTA = 64;
1052 for (oc = objects; oc; oc = oc->next) {
1053 for (i = 0; i < oc->n_symbols; i++) {
1054 sym = oc->symbols[i];
1055 if (sym == NULL) continue;
1056 // debugBelch("enquire %p %p\n", sym, oc->lochash);
1058 if (oc->lochash != NULL) {
1059 a = lookupStrHashTable(oc->lochash, sym);
1062 a = lookupStrHashTable(symhash, sym);
1065 // debugBelch("ghci_enquire: can't find %s\n", sym);
1067 else if (addr-DELTA <= a && a <= addr+DELTA) {
1068 debugBelch("%p + %3d == `%s'\n", addr, (int)(a - addr), sym);
1075 #ifdef ia64_HOST_ARCH
1076 static unsigned int PLTSize(void);
1079 /* -----------------------------------------------------------------------------
1080 * Load an obj (populate the global symbol table, but don't resolve yet)
1082 * Returns: 1 if ok, 0 on error.
1085 loadObj( char *path )
1092 void *map_addr = NULL;
1099 /* debugBelch("loadObj %s\n", path ); */
1101 /* Check that we haven't already loaded this object.
1102 Ignore requests to load multiple times */
1106 for (o = objects; o; o = o->next) {
1107 if (0 == strcmp(o->fileName, path)) {
1109 break; /* don't need to search further */
1113 IF_DEBUG(linker, debugBelch(
1114 "GHCi runtime linker: warning: looks like you're trying to load the\n"
1115 "same object file twice:\n"
1117 "GHCi will ignore this, but be warned.\n"
1119 return 1; /* success */
1123 oc = stgMallocBytes(sizeof(ObjectCode), "loadObj(oc)");
1125 # if defined(OBJFORMAT_ELF)
1126 oc->formatName = "ELF";
1127 # elif defined(OBJFORMAT_PEi386)
1128 oc->formatName = "PEi386";
1129 # elif defined(OBJFORMAT_MACHO)
1130 oc->formatName = "Mach-O";
1133 barf("loadObj: not implemented on this platform");
1136 r = stat(path, &st);
1137 if (r == -1) { return 0; }
1139 /* sigh, strdup() isn't a POSIX function, so do it the long way */
1140 oc->fileName = stgMallocBytes( strlen(path)+1, "loadObj" );
1141 strcpy(oc->fileName, path);
1143 oc->fileSize = st.st_size;
1145 oc->sections = NULL;
1146 oc->lochash = allocStrHashTable();
1147 oc->proddables = NULL;
1149 /* chain it onto the list of objects */
1154 #define ROUND_UP(x,size) ((x + size - 1) & ~(size - 1))
1156 /* On many architectures malloc'd memory isn't executable, so we need to use mmap. */
1158 #if defined(openbsd_HOST_OS)
1159 fd = open(path, O_RDONLY, S_IRUSR);
1161 fd = open(path, O_RDONLY);
1164 barf("loadObj: can't open `%s'", path);
1166 pagesize = getpagesize();
1168 #ifdef ia64_HOST_ARCH
1169 /* The PLT needs to be right before the object */
1170 n = ROUND_UP(PLTSize(), pagesize);
1171 oc->plt = mmap(NULL, n, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
1172 if (oc->plt == MAP_FAILED)
1173 barf("loadObj: can't allocate PLT");
1176 map_addr = oc->plt + n;
1179 n = ROUND_UP(oc->fileSize, pagesize);
1181 /* Link objects into the lower 2Gb on x86_64. GHC assumes the
1182 * small memory model on this architecture (see gcc docs,
1185 #ifdef x86_64_HOST_ARCH
1186 #define EXTRA_MAP_FLAGS MAP_32BIT
1188 #define EXTRA_MAP_FLAGS 0
1191 oc->image = mmap(map_addr, n, PROT_EXEC|PROT_READ|PROT_WRITE,
1192 MAP_PRIVATE|EXTRA_MAP_FLAGS, fd, 0);
1193 if (oc->image == MAP_FAILED)
1194 barf("loadObj: can't map `%s'", path);
1198 #else /* !USE_MMAP */
1200 /* load the image into memory */
1201 f = fopen(path, "rb");
1203 barf("loadObj: can't read `%s'", path);
1205 #ifdef darwin_HOST_OS
1206 // In a Mach-O .o file, all sections can and will be misaligned
1207 // if the total size of the headers is not a multiple of the
1208 // desired alignment. This is fine for .o files that only serve
1209 // as input for the static linker, but it's not fine for us,
1210 // as SSE (used by gcc for floating point) and Altivec require
1211 // 16-byte alignment.
1212 // We calculate the correct alignment from the header before
1213 // reading the file, and then we misalign oc->image on purpose so
1214 // that the actual sections end up aligned again.
1215 misalignment = machoGetMisalignment(f);
1216 oc->misalignment = misalignment;
1221 oc->image = stgMallocBytes(oc->fileSize + misalignment, "loadObj(image)");
1222 oc->image += misalignment;
1224 n = fread ( oc->image, 1, oc->fileSize, f );
1225 if (n != oc->fileSize)
1226 barf("loadObj: error whilst reading `%s'", path);
1230 #endif /* USE_MMAP */
1232 # if defined(OBJFORMAT_MACHO) && defined(powerpc_HOST_ARCH)
1233 r = ocAllocateJumpIslands_MachO ( oc );
1234 if (!r) { return r; }
1235 # elif defined(OBJFORMAT_ELF) && defined(powerpc_HOST_ARCH)
1236 r = ocAllocateJumpIslands_ELF ( oc );
1237 if (!r) { return r; }
1240 /* verify the in-memory image */
1241 # if defined(OBJFORMAT_ELF)
1242 r = ocVerifyImage_ELF ( oc );
1243 # elif defined(OBJFORMAT_PEi386)
1244 r = ocVerifyImage_PEi386 ( oc );
1245 # elif defined(OBJFORMAT_MACHO)
1246 r = ocVerifyImage_MachO ( oc );
1248 barf("loadObj: no verify method");
1250 if (!r) { return r; }
1252 /* build the symbol list for this image */
1253 # if defined(OBJFORMAT_ELF)
1254 r = ocGetNames_ELF ( oc );
1255 # elif defined(OBJFORMAT_PEi386)
1256 r = ocGetNames_PEi386 ( oc );
1257 # elif defined(OBJFORMAT_MACHO)
1258 r = ocGetNames_MachO ( oc );
1260 barf("loadObj: no getNames method");
1262 if (!r) { return r; }
1264 /* loaded, but not resolved yet */
1265 oc->status = OBJECT_LOADED;
1270 /* -----------------------------------------------------------------------------
1271 * resolve all the currently unlinked objects in memory
1273 * Returns: 1 if ok, 0 on error.
1283 for (oc = objects; oc; oc = oc->next) {
1284 if (oc->status != OBJECT_RESOLVED) {
1285 # if defined(OBJFORMAT_ELF)
1286 r = ocResolve_ELF ( oc );
1287 # elif defined(OBJFORMAT_PEi386)
1288 r = ocResolve_PEi386 ( oc );
1289 # elif defined(OBJFORMAT_MACHO)
1290 r = ocResolve_MachO ( oc );
1292 barf("resolveObjs: not implemented on this platform");
1294 if (!r) { return r; }
1295 oc->status = OBJECT_RESOLVED;
1301 /* -----------------------------------------------------------------------------
1302 * delete an object from the pool
1305 unloadObj( char *path )
1307 ObjectCode *oc, *prev;
1309 ASSERT(symhash != NULL);
1310 ASSERT(objects != NULL);
1315 for (oc = objects; oc; prev = oc, oc = oc->next) {
1316 if (!strcmp(oc->fileName,path)) {
1318 /* Remove all the mappings for the symbols within this
1323 for (i = 0; i < oc->n_symbols; i++) {
1324 if (oc->symbols[i] != NULL) {
1325 removeStrHashTable(symhash, oc->symbols[i], NULL);
1333 prev->next = oc->next;
1336 /* We're going to leave this in place, in case there are
1337 any pointers from the heap into it: */
1338 /* stgFree(oc->image); */
1339 stgFree(oc->fileName);
1340 stgFree(oc->symbols);
1341 stgFree(oc->sections);
1342 /* The local hash table should have been freed at the end
1343 of the ocResolve_ call on it. */
1344 ASSERT(oc->lochash == NULL);
1350 errorBelch("unloadObj: can't find `%s' to unload", path);
1354 /* -----------------------------------------------------------------------------
1355 * Sanity checking. For each ObjectCode, maintain a list of address ranges
1356 * which may be prodded during relocation, and abort if we try and write
1357 * outside any of these.
1359 static void addProddableBlock ( ObjectCode* oc, void* start, int size )
1362 = stgMallocBytes(sizeof(ProddableBlock), "addProddableBlock");
1363 /* debugBelch("aPB %p %p %d\n", oc, start, size); */
1367 pb->next = oc->proddables;
1368 oc->proddables = pb;
1371 static void checkProddableBlock ( ObjectCode* oc, void* addr )
1374 for (pb = oc->proddables; pb != NULL; pb = pb->next) {
1375 char* s = (char*)(pb->start);
1376 char* e = s + pb->size - 1;
1377 char* a = (char*)addr;
1378 /* Assumes that the biggest fixup involves a 4-byte write. This
1379 probably needs to be changed to 8 (ie, +7) on 64-bit
1381 if (a >= s && (a+3) <= e) return;
1383 barf("checkProddableBlock: invalid fixup in runtime linker");
1386 /* -----------------------------------------------------------------------------
1387 * Section management.
1389 static void addSection ( ObjectCode* oc, SectionKind kind,
1390 void* start, void* end )
1392 Section* s = stgMallocBytes(sizeof(Section), "addSection");
1396 s->next = oc->sections;
1399 debugBelch("addSection: %p-%p (size %d), kind %d\n",
1400 start, ((char*)end)-1, end - start + 1, kind );
1405 /* --------------------------------------------------------------------------
1406 * PowerPC specifics (jump islands)
1407 * ------------------------------------------------------------------------*/
1409 #if defined(powerpc_HOST_ARCH)
1412 ocAllocateJumpIslands
1414 Allocate additional space at the end of the object file image to make room
1417 PowerPC relative branch instructions have a 24 bit displacement field.
1418 As PPC code is always 4-byte-aligned, this yields a +-32MB range.
1419 If a particular imported symbol is outside this range, we have to redirect
1420 the jump to a short piece of new code that just loads the 32bit absolute
1421 address and jumps there.
1422 This function just allocates space for one 16 byte ppcJumpIsland for every
1423 undefined symbol in the object file. The code for the islands is filled in by
1424 makeJumpIsland below.
1427 static int ocAllocateJumpIslands( ObjectCode* oc, int count, int first )
1433 int misalignment = 0;
1435 misalignment = oc->misalignment;
1440 // round up to the nearest 4
1441 aligned = (oc->fileSize + 3) & ~3;
1444 #ifndef linux_HOST_OS /* mremap is a linux extension */
1445 #error ocAllocateJumpIslands doesnt want USE_MMAP to be defined
1448 pagesize = getpagesize();
1449 n = ROUND_UP( oc->fileSize, pagesize );
1450 m = ROUND_UP( aligned + sizeof (ppcJumpIsland) * count, pagesize );
1452 /* If we have a half-page-size file and map one page of it then
1453 * the part of the page after the size of the file remains accessible.
1454 * If, however, we map in 2 pages, the 2nd page is not accessible
1455 * and will give a "Bus Error" on access. To get around this, we check
1456 * if we need any extra pages for the jump islands and map them in
1457 * anonymously. We must check that we actually require extra pages
1458 * otherwise the attempt to mmap 0 pages of anonymous memory will
1464 /* The effect of this mremap() call is only the ensure that we have
1465 * a sufficient number of virtually contiguous pages. As returned from
1466 * mremap, the pages past the end of the file are not backed. We give
1467 * them a backing by using MAP_FIXED to map in anonymous pages.
1469 oc->image = mremap( oc->image, n, m, MREMAP_MAYMOVE );
1471 if( oc->image == MAP_FAILED )
1473 errorBelch( "Unable to mremap for Jump Islands\n" );
1477 if( mmap( oc->image + n, m - n, PROT_READ | PROT_WRITE | PROT_EXEC,
1478 MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED, 0, 0 ) == MAP_FAILED )
1480 errorBelch( "Unable to mmap( MAP_FIXED ) for Jump Islands\n" );
1486 oc->image -= misalignment;
1487 oc->image = stgReallocBytes( oc->image,
1489 aligned + sizeof (ppcJumpIsland) * count,
1490 "ocAllocateJumpIslands" );
1491 oc->image += misalignment;
1492 #endif /* USE_MMAP */
1494 oc->jump_islands = (ppcJumpIsland *) (oc->image + aligned);
1495 memset( oc->jump_islands, 0, sizeof (ppcJumpIsland) * count );
1498 oc->jump_islands = NULL;
1500 oc->island_start_symbol = first;
1501 oc->n_islands = count;
1506 static unsigned long makeJumpIsland( ObjectCode* oc,
1507 unsigned long symbolNumber,
1508 unsigned long target )
1510 ppcJumpIsland *island;
1512 if( symbolNumber < oc->island_start_symbol ||
1513 symbolNumber - oc->island_start_symbol > oc->n_islands)
1516 island = &oc->jump_islands[symbolNumber - oc->island_start_symbol];
1518 // lis r12, hi16(target)
1519 island->lis_r12 = 0x3d80;
1520 island->hi_addr = target >> 16;
1522 // ori r12, r12, lo16(target)
1523 island->ori_r12_r12 = 0x618c;
1524 island->lo_addr = target & 0xffff;
1527 island->mtctr_r12 = 0x7d8903a6;
1530 island->bctr = 0x4e800420;
1532 return (unsigned long) island;
1536 ocFlushInstructionCache
1538 Flush the data & instruction caches.
1539 Because the PPC has split data/instruction caches, we have to
1540 do that whenever we modify code at runtime.
1543 static void ocFlushInstructionCache( ObjectCode *oc )
1545 int n = (oc->fileSize + sizeof( ppcJumpIsland ) * oc->n_islands + 3) / 4;
1546 unsigned long *p = (unsigned long *) oc->image;
1550 __asm__ volatile ( "dcbf 0,%0\n\t"
1558 __asm__ volatile ( "sync\n\t"
1564 /* --------------------------------------------------------------------------
1565 * PEi386 specifics (Win32 targets)
1566 * ------------------------------------------------------------------------*/
1568 /* The information for this linker comes from
1569 Microsoft Portable Executable
1570 and Common Object File Format Specification
1571 revision 5.1 January 1998
1572 which SimonM says comes from the MS Developer Network CDs.
1574 It can be found there (on older CDs), but can also be found
1577 http://www.microsoft.com/hwdev/hardware/PECOFF.asp
1579 (this is Rev 6.0 from February 1999).
1581 Things move, so if that fails, try searching for it via
1583 http://www.google.com/search?q=PE+COFF+specification
1585 The ultimate reference for the PE format is the Winnt.h
1586 header file that comes with the Platform SDKs; as always,
1587 implementations will drift wrt their documentation.
1589 A good background article on the PE format is Matt Pietrek's
1590 March 1994 article in Microsoft System Journal (MSJ)
1591 (Vol.9, No. 3): "Peering Inside the PE: A Tour of the
1592 Win32 Portable Executable File Format." The info in there
1593 has recently been updated in a two part article in
1594 MSDN magazine, issues Feb and March 2002,
1595 "Inside Windows: An In-Depth Look into the Win32 Portable
1596 Executable File Format"
1598 John Levine's book "Linkers and Loaders" contains useful
1603 #if defined(OBJFORMAT_PEi386)
1607 typedef unsigned char UChar;
1608 typedef unsigned short UInt16;
1609 typedef unsigned int UInt32;
1616 UInt16 NumberOfSections;
1617 UInt32 TimeDateStamp;
1618 UInt32 PointerToSymbolTable;
1619 UInt32 NumberOfSymbols;
1620 UInt16 SizeOfOptionalHeader;
1621 UInt16 Characteristics;
1625 #define sizeof_COFF_header 20
1632 UInt32 VirtualAddress;
1633 UInt32 SizeOfRawData;
1634 UInt32 PointerToRawData;
1635 UInt32 PointerToRelocations;
1636 UInt32 PointerToLinenumbers;
1637 UInt16 NumberOfRelocations;
1638 UInt16 NumberOfLineNumbers;
1639 UInt32 Characteristics;
1643 #define sizeof_COFF_section 40
1650 UInt16 SectionNumber;
1653 UChar NumberOfAuxSymbols;
1657 #define sizeof_COFF_symbol 18
1662 UInt32 VirtualAddress;
1663 UInt32 SymbolTableIndex;
1668 #define sizeof_COFF_reloc 10
1671 /* From PE spec doc, section 3.3.2 */
1672 /* Note use of MYIMAGE_* since IMAGE_* are already defined in
1673 windows.h -- for the same purpose, but I want to know what I'm
1675 #define MYIMAGE_FILE_RELOCS_STRIPPED 0x0001
1676 #define MYIMAGE_FILE_EXECUTABLE_IMAGE 0x0002
1677 #define MYIMAGE_FILE_DLL 0x2000
1678 #define MYIMAGE_FILE_SYSTEM 0x1000
1679 #define MYIMAGE_FILE_BYTES_REVERSED_HI 0x8000
1680 #define MYIMAGE_FILE_BYTES_REVERSED_LO 0x0080
1681 #define MYIMAGE_FILE_32BIT_MACHINE 0x0100
1683 /* From PE spec doc, section 5.4.2 and 5.4.4 */
1684 #define MYIMAGE_SYM_CLASS_EXTERNAL 2
1685 #define MYIMAGE_SYM_CLASS_STATIC 3
1686 #define MYIMAGE_SYM_UNDEFINED 0
1688 /* From PE spec doc, section 4.1 */
1689 #define MYIMAGE_SCN_CNT_CODE 0x00000020
1690 #define MYIMAGE_SCN_CNT_INITIALIZED_DATA 0x00000040
1691 #define MYIMAGE_SCN_LNK_NRELOC_OVFL 0x01000000
1693 /* From PE spec doc, section 5.2.1 */
1694 #define MYIMAGE_REL_I386_DIR32 0x0006
1695 #define MYIMAGE_REL_I386_REL32 0x0014
1698 /* We use myindex to calculate array addresses, rather than
1699 simply doing the normal subscript thing. That's because
1700 some of the above structs have sizes which are not
1701 a whole number of words. GCC rounds their sizes up to a
1702 whole number of words, which means that the address calcs
1703 arising from using normal C indexing or pointer arithmetic
1704 are just plain wrong. Sigh.
1707 myindex ( int scale, void* base, int index )
1710 ((UChar*)base) + scale * index;
1715 printName ( UChar* name, UChar* strtab )
1717 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
1718 UInt32 strtab_offset = * (UInt32*)(name+4);
1719 debugBelch("%s", strtab + strtab_offset );
1722 for (i = 0; i < 8; i++) {
1723 if (name[i] == 0) break;
1724 debugBelch("%c", name[i] );
1731 copyName ( UChar* name, UChar* strtab, UChar* dst, int dstSize )
1733 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
1734 UInt32 strtab_offset = * (UInt32*)(name+4);
1735 strncpy ( dst, strtab+strtab_offset, dstSize );
1741 if (name[i] == 0) break;
1751 cstring_from_COFF_symbol_name ( UChar* name, UChar* strtab )
1754 /* If the string is longer than 8 bytes, look in the
1755 string table for it -- this will be correctly zero terminated.
1757 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
1758 UInt32 strtab_offset = * (UInt32*)(name+4);
1759 return ((UChar*)strtab) + strtab_offset;
1761 /* Otherwise, if shorter than 8 bytes, return the original,
1762 which by defn is correctly terminated.
1764 if (name[7]==0) return name;
1765 /* The annoying case: 8 bytes. Copy into a temporary
1766 (which is never freed ...)
1768 newstr = stgMallocBytes(9, "cstring_from_COFF_symbol_name");
1770 strncpy(newstr,name,8);
1776 /* Just compares the short names (first 8 chars) */
1777 static COFF_section *
1778 findPEi386SectionCalled ( ObjectCode* oc, char* name )
1782 = (COFF_header*)(oc->image);
1783 COFF_section* sectab
1785 ((UChar*)(oc->image))
1786 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
1788 for (i = 0; i < hdr->NumberOfSections; i++) {
1791 COFF_section* section_i
1793 myindex ( sizeof_COFF_section, sectab, i );
1794 n1 = (UChar*) &(section_i->Name);
1796 if (n1[0]==n2[0] && n1[1]==n2[1] && n1[2]==n2[2] &&
1797 n1[3]==n2[3] && n1[4]==n2[4] && n1[5]==n2[5] &&
1798 n1[6]==n2[6] && n1[7]==n2[7])
1807 zapTrailingAtSign ( UChar* sym )
1809 # define my_isdigit(c) ((c) >= '0' && (c) <= '9')
1811 if (sym[0] == 0) return;
1813 while (sym[i] != 0) i++;
1816 while (j > 0 && my_isdigit(sym[j])) j--;
1817 if (j > 0 && sym[j] == '@' && j != i) sym[j] = 0;
1823 ocVerifyImage_PEi386 ( ObjectCode* oc )
1828 COFF_section* sectab;
1829 COFF_symbol* symtab;
1831 /* debugBelch("\nLOADING %s\n", oc->fileName); */
1832 hdr = (COFF_header*)(oc->image);
1833 sectab = (COFF_section*) (
1834 ((UChar*)(oc->image))
1835 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
1837 symtab = (COFF_symbol*) (
1838 ((UChar*)(oc->image))
1839 + hdr->PointerToSymbolTable
1841 strtab = ((UChar*)symtab)
1842 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
1844 if (hdr->Machine != 0x14c) {
1845 errorBelch("%s: Not x86 PEi386", oc->fileName);
1848 if (hdr->SizeOfOptionalHeader != 0) {
1849 errorBelch("%s: PEi386 with nonempty optional header", oc->fileName);
1852 if ( /* (hdr->Characteristics & MYIMAGE_FILE_RELOCS_STRIPPED) || */
1853 (hdr->Characteristics & MYIMAGE_FILE_EXECUTABLE_IMAGE) ||
1854 (hdr->Characteristics & MYIMAGE_FILE_DLL) ||
1855 (hdr->Characteristics & MYIMAGE_FILE_SYSTEM) ) {
1856 errorBelch("%s: Not a PEi386 object file", oc->fileName);
1859 if ( (hdr->Characteristics & MYIMAGE_FILE_BYTES_REVERSED_HI)
1860 /* || !(hdr->Characteristics & MYIMAGE_FILE_32BIT_MACHINE) */ ) {
1861 errorBelch("%s: Invalid PEi386 word size or endiannness: %d",
1863 (int)(hdr->Characteristics));
1866 /* If the string table size is way crazy, this might indicate that
1867 there are more than 64k relocations, despite claims to the
1868 contrary. Hence this test. */
1869 /* debugBelch("strtab size %d\n", * (UInt32*)strtab); */
1871 if ( (*(UInt32*)strtab) > 600000 ) {
1872 /* Note that 600k has no special significance other than being
1873 big enough to handle the almost-2MB-sized lumps that
1874 constitute HSwin32*.o. */
1875 debugBelch("PEi386 object has suspiciously large string table; > 64k relocs?");
1880 /* No further verification after this point; only debug printing. */
1882 IF_DEBUG(linker, i=1);
1883 if (i == 0) return 1;
1885 debugBelch( "sectab offset = %d\n", ((UChar*)sectab) - ((UChar*)hdr) );
1886 debugBelch( "symtab offset = %d\n", ((UChar*)symtab) - ((UChar*)hdr) );
1887 debugBelch( "strtab offset = %d\n", ((UChar*)strtab) - ((UChar*)hdr) );
1890 debugBelch( "Machine: 0x%x\n", (UInt32)(hdr->Machine) );
1891 debugBelch( "# sections: %d\n", (UInt32)(hdr->NumberOfSections) );
1892 debugBelch( "time/date: 0x%x\n", (UInt32)(hdr->TimeDateStamp) );
1893 debugBelch( "symtab offset: %d\n", (UInt32)(hdr->PointerToSymbolTable) );
1894 debugBelch( "# symbols: %d\n", (UInt32)(hdr->NumberOfSymbols) );
1895 debugBelch( "sz of opt hdr: %d\n", (UInt32)(hdr->SizeOfOptionalHeader) );
1896 debugBelch( "characteristics: 0x%x\n", (UInt32)(hdr->Characteristics) );
1898 /* Print the section table. */
1900 for (i = 0; i < hdr->NumberOfSections; i++) {
1902 COFF_section* sectab_i
1904 myindex ( sizeof_COFF_section, sectab, i );
1911 printName ( sectab_i->Name, strtab );
1921 sectab_i->VirtualSize,
1922 sectab_i->VirtualAddress,
1923 sectab_i->SizeOfRawData,
1924 sectab_i->PointerToRawData,
1925 sectab_i->NumberOfRelocations,
1926 sectab_i->PointerToRelocations,
1927 sectab_i->PointerToRawData
1929 reltab = (COFF_reloc*) (
1930 ((UChar*)(oc->image)) + sectab_i->PointerToRelocations
1933 if ( sectab_i->Characteristics & MYIMAGE_SCN_LNK_NRELOC_OVFL ) {
1934 /* If the relocation field (a short) has overflowed, the
1935 * real count can be found in the first reloc entry.
1937 * See Section 4.1 (last para) of the PE spec (rev6.0).
1939 COFF_reloc* rel = (COFF_reloc*)
1940 myindex ( sizeof_COFF_reloc, reltab, 0 );
1941 noRelocs = rel->VirtualAddress;
1944 noRelocs = sectab_i->NumberOfRelocations;
1948 for (; j < noRelocs; j++) {
1950 COFF_reloc* rel = (COFF_reloc*)
1951 myindex ( sizeof_COFF_reloc, reltab, j );
1953 " type 0x%-4x vaddr 0x%-8x name `",
1955 rel->VirtualAddress );
1956 sym = (COFF_symbol*)
1957 myindex ( sizeof_COFF_symbol, symtab, rel->SymbolTableIndex );
1958 /* Hmm..mysterious looking offset - what's it for? SOF */
1959 printName ( sym->Name, strtab -10 );
1966 debugBelch("string table has size 0x%x\n", * (UInt32*)strtab );
1967 debugBelch("---START of string table---\n");
1968 for (i = 4; i < *(Int32*)strtab; i++) {
1970 debugBelch("\n"); else
1971 debugBelch("%c", strtab[i] );
1973 debugBelch("--- END of string table---\n");
1978 COFF_symbol* symtab_i;
1979 if (i >= (Int32)(hdr->NumberOfSymbols)) break;
1980 symtab_i = (COFF_symbol*)
1981 myindex ( sizeof_COFF_symbol, symtab, i );
1987 printName ( symtab_i->Name, strtab );
1996 (Int32)(symtab_i->SectionNumber),
1997 (UInt32)symtab_i->Type,
1998 (UInt32)symtab_i->StorageClass,
1999 (UInt32)symtab_i->NumberOfAuxSymbols
2001 i += symtab_i->NumberOfAuxSymbols;
2011 ocGetNames_PEi386 ( ObjectCode* oc )
2014 COFF_section* sectab;
2015 COFF_symbol* symtab;
2022 hdr = (COFF_header*)(oc->image);
2023 sectab = (COFF_section*) (
2024 ((UChar*)(oc->image))
2025 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2027 symtab = (COFF_symbol*) (
2028 ((UChar*)(oc->image))
2029 + hdr->PointerToSymbolTable
2031 strtab = ((UChar*)(oc->image))
2032 + hdr->PointerToSymbolTable
2033 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
2035 /* Allocate space for any (local, anonymous) .bss sections. */
2037 for (i = 0; i < hdr->NumberOfSections; i++) {
2040 COFF_section* sectab_i
2042 myindex ( sizeof_COFF_section, sectab, i );
2043 if (0 != strcmp(sectab_i->Name, ".bss")) continue;
2044 /* sof 10/05: the PE spec text isn't too clear regarding what
2045 * the SizeOfRawData field is supposed to hold for object
2046 * file sections containing just uninitialized data -- for executables,
2047 * it is supposed to be zero; unclear what it's supposed to be
2048 * for object files. However, VirtualSize is guaranteed to be
2049 * zero for object files, which definitely suggests that SizeOfRawData
2050 * will be non-zero (where else would the size of this .bss section be
2051 * stored?) Looking at the COFF_section info for incoming object files,
2052 * this certainly appears to be the case.
2054 * => I suspect we've been incorrectly handling .bss sections in (relocatable)
2055 * object files up until now. This turned out to bite us with ghc-6.4.1's use
2056 * of gcc-3.4.x, which has started to emit initially-zeroed-out local 'static'
2057 * variable decls into to the .bss section. (The specific function in Q which
2058 * triggered this is libraries/base/cbits/dirUtils.c:__hscore_getFolderPath())
2060 if (sectab_i->VirtualSize == 0 && sectab_i->SizeOfRawData == 0) continue;
2061 /* This is a non-empty .bss section. Allocate zeroed space for
2062 it, and set its PointerToRawData field such that oc->image +
2063 PointerToRawData == addr_of_zeroed_space. */
2064 bss_sz = sectab_i->VirtualSize;
2065 if ( bss_sz < sectab_i->SizeOfRawData) { bss_sz = sectab_i->SizeOfRawData; }
2066 zspace = stgCallocBytes(1, bss_sz, "ocGetNames_PEi386(anonymous bss)");
2067 sectab_i->PointerToRawData = ((UChar*)zspace) - ((UChar*)(oc->image));
2068 addProddableBlock(oc, zspace, bss_sz);
2069 /* debugBelch("BSS anon section at 0x%x\n", zspace); */
2072 /* Copy section information into the ObjectCode. */
2074 for (i = 0; i < hdr->NumberOfSections; i++) {
2080 = SECTIONKIND_OTHER;
2081 COFF_section* sectab_i
2083 myindex ( sizeof_COFF_section, sectab, i );
2084 IF_DEBUG(linker, debugBelch("section name = %s\n", sectab_i->Name ));
2087 /* I'm sure this is the Right Way to do it. However, the
2088 alternative of testing the sectab_i->Name field seems to
2089 work ok with Cygwin.
2091 if (sectab_i->Characteristics & MYIMAGE_SCN_CNT_CODE ||
2092 sectab_i->Characteristics & MYIMAGE_SCN_CNT_INITIALIZED_DATA)
2093 kind = SECTIONKIND_CODE_OR_RODATA;
2096 if (0==strcmp(".text",sectab_i->Name) ||
2097 0==strcmp(".rdata",sectab_i->Name)||
2098 0==strcmp(".rodata",sectab_i->Name))
2099 kind = SECTIONKIND_CODE_OR_RODATA;
2100 if (0==strcmp(".data",sectab_i->Name) ||
2101 0==strcmp(".bss",sectab_i->Name))
2102 kind = SECTIONKIND_RWDATA;
2104 ASSERT(sectab_i->SizeOfRawData == 0 || sectab_i->VirtualSize == 0);
2105 sz = sectab_i->SizeOfRawData;
2106 if (sz < sectab_i->VirtualSize) sz = sectab_i->VirtualSize;
2108 start = ((UChar*)(oc->image)) + sectab_i->PointerToRawData;
2109 end = start + sz - 1;
2111 if (kind == SECTIONKIND_OTHER
2112 /* Ignore sections called which contain stabs debugging
2114 && 0 != strcmp(".stab", sectab_i->Name)
2115 && 0 != strcmp(".stabstr", sectab_i->Name)
2116 /* ignore constructor section for now */
2117 && 0 != strcmp(".ctors", sectab_i->Name)
2119 errorBelch("Unknown PEi386 section name `%s' (while processing: %s)", sectab_i->Name, oc->fileName);
2123 if (kind != SECTIONKIND_OTHER && end >= start) {
2124 addSection(oc, kind, start, end);
2125 addProddableBlock(oc, start, end - start + 1);
2129 /* Copy exported symbols into the ObjectCode. */
2131 oc->n_symbols = hdr->NumberOfSymbols;
2132 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
2133 "ocGetNames_PEi386(oc->symbols)");
2134 /* Call me paranoid; I don't care. */
2135 for (i = 0; i < oc->n_symbols; i++)
2136 oc->symbols[i] = NULL;
2140 COFF_symbol* symtab_i;
2141 if (i >= (Int32)(hdr->NumberOfSymbols)) break;
2142 symtab_i = (COFF_symbol*)
2143 myindex ( sizeof_COFF_symbol, symtab, i );
2147 if (symtab_i->StorageClass == MYIMAGE_SYM_CLASS_EXTERNAL
2148 && symtab_i->SectionNumber != MYIMAGE_SYM_UNDEFINED) {
2149 /* This symbol is global and defined, viz, exported */
2150 /* for MYIMAGE_SYMCLASS_EXTERNAL
2151 && !MYIMAGE_SYM_UNDEFINED,
2152 the address of the symbol is:
2153 address of relevant section + offset in section
2155 COFF_section* sectabent
2156 = (COFF_section*) myindex ( sizeof_COFF_section,
2158 symtab_i->SectionNumber-1 );
2159 addr = ((UChar*)(oc->image))
2160 + (sectabent->PointerToRawData
2164 if (symtab_i->SectionNumber == MYIMAGE_SYM_UNDEFINED
2165 && symtab_i->Value > 0) {
2166 /* This symbol isn't in any section at all, ie, global bss.
2167 Allocate zeroed space for it. */
2168 addr = stgCallocBytes(1, symtab_i->Value,
2169 "ocGetNames_PEi386(non-anonymous bss)");
2170 addSection(oc, SECTIONKIND_RWDATA, addr,
2171 ((UChar*)addr) + symtab_i->Value - 1);
2172 addProddableBlock(oc, addr, symtab_i->Value);
2173 /* debugBelch("BSS section at 0x%x\n", addr); */
2176 if (addr != NULL ) {
2177 sname = cstring_from_COFF_symbol_name ( symtab_i->Name, strtab );
2178 /* debugBelch("addSymbol %p `%s \n", addr,sname); */
2179 IF_DEBUG(linker, debugBelch("addSymbol %p `%s'\n", addr,sname);)
2180 ASSERT(i >= 0 && i < oc->n_symbols);
2181 /* cstring_from_COFF_symbol_name always succeeds. */
2182 oc->symbols[i] = sname;
2183 ghciInsertStrHashTable(oc->fileName, symhash, sname, addr);
2187 "IGNORING symbol %d\n"
2191 printName ( symtab_i->Name, strtab );
2200 (Int32)(symtab_i->SectionNumber),
2201 (UInt32)symtab_i->Type,
2202 (UInt32)symtab_i->StorageClass,
2203 (UInt32)symtab_i->NumberOfAuxSymbols
2208 i += symtab_i->NumberOfAuxSymbols;
2217 ocResolve_PEi386 ( ObjectCode* oc )
2220 COFF_section* sectab;
2221 COFF_symbol* symtab;
2231 /* ToDo: should be variable-sized? But is at least safe in the
2232 sense of buffer-overrun-proof. */
2234 /* debugBelch("resolving for %s\n", oc->fileName); */
2236 hdr = (COFF_header*)(oc->image);
2237 sectab = (COFF_section*) (
2238 ((UChar*)(oc->image))
2239 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2241 symtab = (COFF_symbol*) (
2242 ((UChar*)(oc->image))
2243 + hdr->PointerToSymbolTable
2245 strtab = ((UChar*)(oc->image))
2246 + hdr->PointerToSymbolTable
2247 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
2249 for (i = 0; i < hdr->NumberOfSections; i++) {
2250 COFF_section* sectab_i
2252 myindex ( sizeof_COFF_section, sectab, i );
2255 ((UChar*)(oc->image)) + sectab_i->PointerToRelocations
2258 /* Ignore sections called which contain stabs debugging
2260 if (0 == strcmp(".stab", sectab_i->Name)
2261 || 0 == strcmp(".stabstr", sectab_i->Name)
2262 || 0 == strcmp(".ctors", sectab_i->Name))
2265 if ( sectab_i->Characteristics & MYIMAGE_SCN_LNK_NRELOC_OVFL ) {
2266 /* If the relocation field (a short) has overflowed, the
2267 * real count can be found in the first reloc entry.
2269 * See Section 4.1 (last para) of the PE spec (rev6.0).
2271 * Nov2003 update: the GNU linker still doesn't correctly
2272 * handle the generation of relocatable object files with
2273 * overflown relocations. Hence the output to warn of potential
2276 COFF_reloc* rel = (COFF_reloc*)
2277 myindex ( sizeof_COFF_reloc, reltab, 0 );
2278 noRelocs = rel->VirtualAddress;
2280 /* 10/05: we now assume (and check for) a GNU ld that is capable
2281 * of handling object files with (>2^16) of relocs.
2284 debugBelch("WARNING: Overflown relocation field (# relocs found: %u)\n",
2289 noRelocs = sectab_i->NumberOfRelocations;
2294 for (; j < noRelocs; j++) {
2296 COFF_reloc* reltab_j
2298 myindex ( sizeof_COFF_reloc, reltab, j );
2300 /* the location to patch */
2302 ((UChar*)(oc->image))
2303 + (sectab_i->PointerToRawData
2304 + reltab_j->VirtualAddress
2305 - sectab_i->VirtualAddress )
2307 /* the existing contents of pP */
2309 /* the symbol to connect to */
2310 sym = (COFF_symbol*)
2311 myindex ( sizeof_COFF_symbol,
2312 symtab, reltab_j->SymbolTableIndex );
2315 "reloc sec %2d num %3d: type 0x%-4x "
2316 "vaddr 0x%-8x name `",
2318 (UInt32)reltab_j->Type,
2319 reltab_j->VirtualAddress );
2320 printName ( sym->Name, strtab );
2321 debugBelch("'\n" ));
2323 if (sym->StorageClass == MYIMAGE_SYM_CLASS_STATIC) {
2324 COFF_section* section_sym
2325 = findPEi386SectionCalled ( oc, sym->Name );
2327 errorBelch("%s: can't find section `%s'", oc->fileName, sym->Name);
2330 S = ((UInt32)(oc->image))
2331 + (section_sym->PointerToRawData
2334 copyName ( sym->Name, strtab, symbol, 1000-1 );
2335 (void*)S = lookupLocalSymbol( oc, symbol );
2336 if ((void*)S != NULL) goto foundit;
2337 (void*)S = lookupSymbol( symbol );
2338 if ((void*)S != NULL) goto foundit;
2339 zapTrailingAtSign ( symbol );
2340 (void*)S = lookupLocalSymbol( oc, symbol );
2341 if ((void*)S != NULL) goto foundit;
2342 (void*)S = lookupSymbol( symbol );
2343 if ((void*)S != NULL) goto foundit;
2344 /* Newline first because the interactive linker has printed "linking..." */
2345 errorBelch("\n%s: unknown symbol `%s'", oc->fileName, symbol);
2349 checkProddableBlock(oc, pP);
2350 switch (reltab_j->Type) {
2351 case MYIMAGE_REL_I386_DIR32:
2354 case MYIMAGE_REL_I386_REL32:
2355 /* Tricky. We have to insert a displacement at
2356 pP which, when added to the PC for the _next_
2357 insn, gives the address of the target (S).
2358 Problem is to know the address of the next insn
2359 when we only know pP. We assume that this
2360 literal field is always the last in the insn,
2361 so that the address of the next insn is pP+4
2362 -- hence the constant 4.
2363 Also I don't know if A should be added, but so
2364 far it has always been zero.
2366 SOF 05/2005: 'A' (old contents of *pP) have been observed
2367 to contain values other than zero (the 'wx' object file
2368 that came with wxhaskell-0.9.4; dunno how it was compiled..).
2369 So, add displacement to old value instead of asserting
2370 A to be zero. Fixes wxhaskell-related crashes, and no other
2371 ill effects have been observed.
2373 Update: the reason why we're seeing these more elaborate
2374 relocations is due to a switch in how the NCG compiles SRTs
2375 and offsets to them from info tables. SRTs live in .(ro)data,
2376 while info tables live in .text, causing GAS to emit REL32/DISP32
2377 relocations with non-zero values. Adding the displacement is
2378 the right thing to do.
2380 *pP = S - ((UInt32)pP) - 4 + A;
2383 debugBelch("%s: unhandled PEi386 relocation type %d",
2384 oc->fileName, reltab_j->Type);
2391 IF_DEBUG(linker, debugBelch("completed %s", oc->fileName));
2395 #endif /* defined(OBJFORMAT_PEi386) */
2398 /* --------------------------------------------------------------------------
2400 * ------------------------------------------------------------------------*/
2402 #if defined(OBJFORMAT_ELF)
2407 #if defined(sparc_HOST_ARCH)
2408 # define ELF_TARGET_SPARC /* Used inside <elf.h> */
2409 #elif defined(i386_HOST_ARCH)
2410 # define ELF_TARGET_386 /* Used inside <elf.h> */
2411 #elif defined(x86_64_HOST_ARCH)
2412 # define ELF_TARGET_X64_64
2414 #elif defined (ia64_HOST_ARCH)
2415 # define ELF_TARGET_IA64 /* Used inside <elf.h> */
2417 # define ELF_FUNCTION_DESC /* calling convention uses function descriptors */
2418 # define ELF_NEED_GOT /* needs Global Offset Table */
2419 # define ELF_NEED_PLT /* needs Procedure Linkage Tables */
2422 #if !defined(openbsd_HOST_OS)
2425 /* openbsd elf has things in different places, with diff names */
2426 #include <elf_abi.h>
2427 #include <machine/reloc.h>
2428 #define R_386_32 RELOC_32
2429 #define R_386_PC32 RELOC_PC32
2433 * Define a set of types which can be used for both ELF32 and ELF64
2437 #define ELFCLASS ELFCLASS64
2438 #define Elf_Addr Elf64_Addr
2439 #define Elf_Word Elf64_Word
2440 #define Elf_Sword Elf64_Sword
2441 #define Elf_Ehdr Elf64_Ehdr
2442 #define Elf_Phdr Elf64_Phdr
2443 #define Elf_Shdr Elf64_Shdr
2444 #define Elf_Sym Elf64_Sym
2445 #define Elf_Rel Elf64_Rel
2446 #define Elf_Rela Elf64_Rela
2447 #define ELF_ST_TYPE ELF64_ST_TYPE
2448 #define ELF_ST_BIND ELF64_ST_BIND
2449 #define ELF_R_TYPE ELF64_R_TYPE
2450 #define ELF_R_SYM ELF64_R_SYM
2452 #define ELFCLASS ELFCLASS32
2453 #define Elf_Addr Elf32_Addr
2454 #define Elf_Word Elf32_Word
2455 #define Elf_Sword Elf32_Sword
2456 #define Elf_Ehdr Elf32_Ehdr
2457 #define Elf_Phdr Elf32_Phdr
2458 #define Elf_Shdr Elf32_Shdr
2459 #define Elf_Sym Elf32_Sym
2460 #define Elf_Rel Elf32_Rel
2461 #define Elf_Rela Elf32_Rela
2463 #define ELF_ST_TYPE ELF32_ST_TYPE
2466 #define ELF_ST_BIND ELF32_ST_BIND
2469 #define ELF_R_TYPE ELF32_R_TYPE
2472 #define ELF_R_SYM ELF32_R_SYM
2478 * Functions to allocate entries in dynamic sections. Currently we simply
2479 * preallocate a large number, and we don't check if a entry for the given
2480 * target already exists (a linear search is too slow). Ideally these
2481 * entries would be associated with symbols.
2484 /* These sizes sufficient to load HSbase + HShaskell98 + a few modules */
2485 #define GOT_SIZE 0x20000
2486 #define FUNCTION_TABLE_SIZE 0x10000
2487 #define PLT_SIZE 0x08000
2490 static Elf_Addr got[GOT_SIZE];
2491 static unsigned int gotIndex;
2492 static Elf_Addr gp_val = (Elf_Addr)got;
2495 allocateGOTEntry(Elf_Addr target)
2499 if (gotIndex >= GOT_SIZE)
2500 barf("Global offset table overflow");
2502 entry = &got[gotIndex++];
2504 return (Elf_Addr)entry;
2508 #ifdef ELF_FUNCTION_DESC
2514 static FunctionDesc functionTable[FUNCTION_TABLE_SIZE];
2515 static unsigned int functionTableIndex;
2518 allocateFunctionDesc(Elf_Addr target)
2520 FunctionDesc *entry;
2522 if (functionTableIndex >= FUNCTION_TABLE_SIZE)
2523 barf("Function table overflow");
2525 entry = &functionTable[functionTableIndex++];
2527 entry->gp = (Elf_Addr)gp_val;
2528 return (Elf_Addr)entry;
2532 copyFunctionDesc(Elf_Addr target)
2534 FunctionDesc *olddesc = (FunctionDesc *)target;
2535 FunctionDesc *newdesc;
2537 newdesc = (FunctionDesc *)allocateFunctionDesc(olddesc->ip);
2538 newdesc->gp = olddesc->gp;
2539 return (Elf_Addr)newdesc;
2544 #ifdef ia64_HOST_ARCH
2545 static void ia64_reloc_gprel22(Elf_Addr target, Elf_Addr value);
2546 static void ia64_reloc_pcrel21(Elf_Addr target, Elf_Addr value, ObjectCode *oc);
2548 static unsigned char plt_code[] =
2550 /* taken from binutils bfd/elfxx-ia64.c */
2551 0x0b, 0x78, 0x00, 0x02, 0x00, 0x24, /* [MMI] addl r15=0,r1;; */
2552 0x00, 0x41, 0x3c, 0x30, 0x28, 0xc0, /* ld8 r16=[r15],8 */
2553 0x01, 0x08, 0x00, 0x84, /* mov r14=r1;; */
2554 0x11, 0x08, 0x00, 0x1e, 0x18, 0x10, /* [MIB] ld8 r1=[r15] */
2555 0x60, 0x80, 0x04, 0x80, 0x03, 0x00, /* mov b6=r16 */
2556 0x60, 0x00, 0x80, 0x00 /* br.few b6;; */
2559 /* If we can't get to the function descriptor via gp, take a local copy of it */
2560 #define PLT_RELOC(code, target) { \
2561 Elf64_Sxword rel_value = target - gp_val; \
2562 if ((rel_value > 0x1fffff) || (rel_value < -0x1fffff)) \
2563 ia64_reloc_gprel22((Elf_Addr)code, copyFunctionDesc(target)); \
2565 ia64_reloc_gprel22((Elf_Addr)code, target); \
2570 unsigned char code[sizeof(plt_code)];
2574 allocatePLTEntry(Elf_Addr target, ObjectCode *oc)
2576 PLTEntry *plt = (PLTEntry *)oc->plt;
2579 if (oc->pltIndex >= PLT_SIZE)
2580 barf("Procedure table overflow");
2582 entry = &plt[oc->pltIndex++];
2583 memcpy(entry->code, plt_code, sizeof(entry->code));
2584 PLT_RELOC(entry->code, target);
2585 return (Elf_Addr)entry;
2591 return (PLT_SIZE * sizeof(PLTEntry));
2596 #if x86_64_HOST_ARCH
2597 // On x86_64, 32-bit relocations are often used, which requires that
2598 // we can resolve a symbol to a 32-bit offset. However, shared
2599 // libraries are placed outside the 2Gb area, which leaves us with a
2600 // problem when we need to give a 32-bit offset to a symbol in a
2603 // For a function symbol, we can allocate a bounce sequence inside the
2604 // 2Gb area and resolve the symbol to this. The bounce sequence is
2605 // simply a long jump instruction to the real location of the symbol.
2607 // For data references, we're screwed.
2610 unsigned char jmp[8]; /* 6 byte instruction: jmpq *0x00000002(%rip) */
2614 #define X86_64_BB_SIZE 1024
2616 static x86_64_bounce *x86_64_bounce_buffer = NULL;
2617 static nat x86_64_bb_next_off;
2620 x86_64_high_symbol( char *lbl, void *addr )
2622 x86_64_bounce *bounce;
2624 if ( x86_64_bounce_buffer == NULL ||
2625 x86_64_bb_next_off >= X86_64_BB_SIZE ) {
2626 x86_64_bounce_buffer =
2627 mmap(NULL, X86_64_BB_SIZE * sizeof(x86_64_bounce),
2628 PROT_EXEC|PROT_READ|PROT_WRITE,
2629 MAP_PRIVATE|MAP_32BIT|MAP_ANONYMOUS, -1, 0);
2630 if (x86_64_bounce_buffer == MAP_FAILED) {
2631 barf("x86_64_high_symbol: mmap failed");
2633 x86_64_bb_next_off = 0;
2635 bounce = &x86_64_bounce_buffer[x86_64_bb_next_off];
2636 bounce->jmp[0] = 0xff;
2637 bounce->jmp[1] = 0x25;
2638 bounce->jmp[2] = 0x02;
2639 bounce->jmp[3] = 0x00;
2640 bounce->jmp[4] = 0x00;
2641 bounce->jmp[5] = 0x00;
2642 bounce->addr = addr;
2643 x86_64_bb_next_off++;
2645 IF_DEBUG(linker, debugBelch("x86_64: allocated bounce entry for %s->%p at %p\n",
2646 lbl, addr, bounce));
2648 insertStrHashTable(symhash, lbl, bounce);
2655 * Generic ELF functions
2659 findElfSection ( void* objImage, Elf_Word sh_type )
2661 char* ehdrC = (char*)objImage;
2662 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2663 Elf_Shdr* shdr = (Elf_Shdr*)(ehdrC + ehdr->e_shoff);
2664 char* sh_strtab = ehdrC + shdr[ehdr->e_shstrndx].sh_offset;
2668 for (i = 0; i < ehdr->e_shnum; i++) {
2669 if (shdr[i].sh_type == sh_type
2670 /* Ignore the section header's string table. */
2671 && i != ehdr->e_shstrndx
2672 /* Ignore string tables named .stabstr, as they contain
2674 && 0 != memcmp(".stabstr", sh_strtab + shdr[i].sh_name, 8)
2676 ptr = ehdrC + shdr[i].sh_offset;
2683 #if defined(ia64_HOST_ARCH)
2685 findElfSegment ( void* objImage, Elf_Addr vaddr )
2687 char* ehdrC = (char*)objImage;
2688 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2689 Elf_Phdr* phdr = (Elf_Phdr*)(ehdrC + ehdr->e_phoff);
2690 Elf_Addr segaddr = 0;
2693 for (i = 0; i < ehdr->e_phnum; i++) {
2694 segaddr = phdr[i].p_vaddr;
2695 if ((vaddr >= segaddr) && (vaddr < segaddr + phdr[i].p_memsz))
2703 ocVerifyImage_ELF ( ObjectCode* oc )
2707 int i, j, nent, nstrtab, nsymtabs;
2711 char* ehdrC = (char*)(oc->image);
2712 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2714 if (ehdr->e_ident[EI_MAG0] != ELFMAG0 ||
2715 ehdr->e_ident[EI_MAG1] != ELFMAG1 ||
2716 ehdr->e_ident[EI_MAG2] != ELFMAG2 ||
2717 ehdr->e_ident[EI_MAG3] != ELFMAG3) {
2718 errorBelch("%s: not an ELF object", oc->fileName);
2722 if (ehdr->e_ident[EI_CLASS] != ELFCLASS) {
2723 errorBelch("%s: unsupported ELF format", oc->fileName);
2727 if (ehdr->e_ident[EI_DATA] == ELFDATA2LSB) {
2728 IF_DEBUG(linker,debugBelch( "Is little-endian\n" ));
2730 if (ehdr->e_ident[EI_DATA] == ELFDATA2MSB) {
2731 IF_DEBUG(linker,debugBelch( "Is big-endian\n" ));
2733 errorBelch("%s: unknown endiannness", oc->fileName);
2737 if (ehdr->e_type != ET_REL) {
2738 errorBelch("%s: not a relocatable object (.o) file", oc->fileName);
2741 IF_DEBUG(linker, debugBelch( "Is a relocatable object (.o) file\n" ));
2743 IF_DEBUG(linker,debugBelch( "Architecture is " ));
2744 switch (ehdr->e_machine) {
2745 case EM_386: IF_DEBUG(linker,debugBelch( "x86" )); break;
2746 case EM_SPARC: IF_DEBUG(linker,debugBelch( "sparc" )); break;
2748 case EM_IA_64: IF_DEBUG(linker,debugBelch( "ia64" )); break;
2750 case EM_PPC: IF_DEBUG(linker,debugBelch( "powerpc32" )); break;
2752 case EM_X86_64: IF_DEBUG(linker,debugBelch( "x86_64" )); break;
2754 default: IF_DEBUG(linker,debugBelch( "unknown" ));
2755 errorBelch("%s: unknown architecture", oc->fileName);
2759 IF_DEBUG(linker,debugBelch(
2760 "\nSection header table: start %ld, n_entries %d, ent_size %d\n",
2761 (long)ehdr->e_shoff, ehdr->e_shnum, ehdr->e_shentsize ));
2763 ASSERT (ehdr->e_shentsize == sizeof(Elf_Shdr));
2765 shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
2767 if (ehdr->e_shstrndx == SHN_UNDEF) {
2768 errorBelch("%s: no section header string table", oc->fileName);
2771 IF_DEBUG(linker,debugBelch( "Section header string table is section %d\n",
2773 sh_strtab = ehdrC + shdr[ehdr->e_shstrndx].sh_offset;
2776 for (i = 0; i < ehdr->e_shnum; i++) {
2777 IF_DEBUG(linker,debugBelch("%2d: ", i ));
2778 IF_DEBUG(linker,debugBelch("type=%2d ", (int)shdr[i].sh_type ));
2779 IF_DEBUG(linker,debugBelch("size=%4d ", (int)shdr[i].sh_size ));
2780 IF_DEBUG(linker,debugBelch("offs=%4d ", (int)shdr[i].sh_offset ));
2781 IF_DEBUG(linker,debugBelch(" (%p .. %p) ",
2782 ehdrC + shdr[i].sh_offset,
2783 ehdrC + shdr[i].sh_offset + shdr[i].sh_size - 1));
2785 if (shdr[i].sh_type == SHT_REL) {
2786 IF_DEBUG(linker,debugBelch("Rel " ));
2787 } else if (shdr[i].sh_type == SHT_RELA) {
2788 IF_DEBUG(linker,debugBelch("RelA " ));
2790 IF_DEBUG(linker,debugBelch(" "));
2793 IF_DEBUG(linker,debugBelch("sname=%s\n", sh_strtab + shdr[i].sh_name ));
2797 IF_DEBUG(linker,debugBelch( "\nString tables" ));
2800 for (i = 0; i < ehdr->e_shnum; i++) {
2801 if (shdr[i].sh_type == SHT_STRTAB
2802 /* Ignore the section header's string table. */
2803 && i != ehdr->e_shstrndx
2804 /* Ignore string tables named .stabstr, as they contain
2806 && 0 != memcmp(".stabstr", sh_strtab + shdr[i].sh_name, 8)
2808 IF_DEBUG(linker,debugBelch(" section %d is a normal string table", i ));
2809 strtab = ehdrC + shdr[i].sh_offset;
2814 errorBelch("%s: no string tables, or too many", oc->fileName);
2819 IF_DEBUG(linker,debugBelch( "\nSymbol tables" ));
2820 for (i = 0; i < ehdr->e_shnum; i++) {
2821 if (shdr[i].sh_type != SHT_SYMTAB) continue;
2822 IF_DEBUG(linker,debugBelch( "section %d is a symbol table\n", i ));
2824 stab = (Elf_Sym*) (ehdrC + shdr[i].sh_offset);
2825 nent = shdr[i].sh_size / sizeof(Elf_Sym);
2826 IF_DEBUG(linker,debugBelch( " number of entries is apparently %d (%ld rem)\n",
2828 (long)shdr[i].sh_size % sizeof(Elf_Sym)
2830 if (0 != shdr[i].sh_size % sizeof(Elf_Sym)) {
2831 errorBelch("%s: non-integral number of symbol table entries", oc->fileName);
2834 for (j = 0; j < nent; j++) {
2835 IF_DEBUG(linker,debugBelch(" %2d ", j ));
2836 IF_DEBUG(linker,debugBelch(" sec=%-5d size=%-3d val=%5p ",
2837 (int)stab[j].st_shndx,
2838 (int)stab[j].st_size,
2839 (char*)stab[j].st_value ));
2841 IF_DEBUG(linker,debugBelch("type=" ));
2842 switch (ELF_ST_TYPE(stab[j].st_info)) {
2843 case STT_NOTYPE: IF_DEBUG(linker,debugBelch("notype " )); break;
2844 case STT_OBJECT: IF_DEBUG(linker,debugBelch("object " )); break;
2845 case STT_FUNC : IF_DEBUG(linker,debugBelch("func " )); break;
2846 case STT_SECTION: IF_DEBUG(linker,debugBelch("section" )); break;
2847 case STT_FILE: IF_DEBUG(linker,debugBelch("file " )); break;
2848 default: IF_DEBUG(linker,debugBelch("? " )); break;
2850 IF_DEBUG(linker,debugBelch(" " ));
2852 IF_DEBUG(linker,debugBelch("bind=" ));
2853 switch (ELF_ST_BIND(stab[j].st_info)) {
2854 case STB_LOCAL : IF_DEBUG(linker,debugBelch("local " )); break;
2855 case STB_GLOBAL: IF_DEBUG(linker,debugBelch("global" )); break;
2856 case STB_WEAK : IF_DEBUG(linker,debugBelch("weak " )); break;
2857 default: IF_DEBUG(linker,debugBelch("? " )); break;
2859 IF_DEBUG(linker,debugBelch(" " ));
2861 IF_DEBUG(linker,debugBelch("name=%s\n", strtab + stab[j].st_name ));
2865 if (nsymtabs == 0) {
2866 errorBelch("%s: didn't find any symbol tables", oc->fileName);
2873 static int getSectionKind_ELF( Elf_Shdr *hdr, int *is_bss )
2877 if (hdr->sh_type == SHT_PROGBITS
2878 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_EXECINSTR)) {
2879 /* .text-style section */
2880 return SECTIONKIND_CODE_OR_RODATA;
2883 if (hdr->sh_type == SHT_PROGBITS
2884 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_WRITE)) {
2885 /* .data-style section */
2886 return SECTIONKIND_RWDATA;
2889 if (hdr->sh_type == SHT_PROGBITS
2890 && (hdr->sh_flags & SHF_ALLOC) && !(hdr->sh_flags & SHF_WRITE)) {
2891 /* .rodata-style section */
2892 return SECTIONKIND_CODE_OR_RODATA;
2895 if (hdr->sh_type == SHT_NOBITS
2896 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_WRITE)) {
2897 /* .bss-style section */
2899 return SECTIONKIND_RWDATA;
2902 return SECTIONKIND_OTHER;
2907 ocGetNames_ELF ( ObjectCode* oc )
2912 char* ehdrC = (char*)(oc->image);
2913 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2914 char* strtab = findElfSection ( ehdrC, SHT_STRTAB );
2915 Elf_Shdr* shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
2917 ASSERT(symhash != NULL);
2920 errorBelch("%s: no strtab", oc->fileName);
2925 for (i = 0; i < ehdr->e_shnum; i++) {
2926 /* Figure out what kind of section it is. Logic derived from
2927 Figure 1.14 ("Special Sections") of the ELF document
2928 ("Portable Formats Specification, Version 1.1"). */
2930 SectionKind kind = getSectionKind_ELF(&shdr[i], &is_bss);
2932 if (is_bss && shdr[i].sh_size > 0) {
2933 /* This is a non-empty .bss section. Allocate zeroed space for
2934 it, and set its .sh_offset field such that
2935 ehdrC + .sh_offset == addr_of_zeroed_space. */
2936 char* zspace = stgCallocBytes(1, shdr[i].sh_size,
2937 "ocGetNames_ELF(BSS)");
2938 shdr[i].sh_offset = ((char*)zspace) - ((char*)ehdrC);
2940 debugBelch("BSS section at 0x%x, size %d\n",
2941 zspace, shdr[i].sh_size);
2945 /* fill in the section info */
2946 if (kind != SECTIONKIND_OTHER && shdr[i].sh_size > 0) {
2947 addProddableBlock(oc, ehdrC + shdr[i].sh_offset, shdr[i].sh_size);
2948 addSection(oc, kind, ehdrC + shdr[i].sh_offset,
2949 ehdrC + shdr[i].sh_offset + shdr[i].sh_size - 1);
2952 if (shdr[i].sh_type != SHT_SYMTAB) continue;
2954 /* copy stuff into this module's object symbol table */
2955 stab = (Elf_Sym*) (ehdrC + shdr[i].sh_offset);
2956 nent = shdr[i].sh_size / sizeof(Elf_Sym);
2958 oc->n_symbols = nent;
2959 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
2960 "ocGetNames_ELF(oc->symbols)");
2962 for (j = 0; j < nent; j++) {
2964 char isLocal = FALSE; /* avoids uninit-var warning */
2966 char* nm = strtab + stab[j].st_name;
2967 int secno = stab[j].st_shndx;
2969 /* Figure out if we want to add it; if so, set ad to its
2970 address. Otherwise leave ad == NULL. */
2972 if (secno == SHN_COMMON) {
2974 ad = stgCallocBytes(1, stab[j].st_size, "ocGetNames_ELF(COMMON)");
2976 debugBelch("COMMON symbol, size %d name %s\n",
2977 stab[j].st_size, nm);
2979 /* Pointless to do addProddableBlock() for this area,
2980 since the linker should never poke around in it. */
2983 if ( ( ELF_ST_BIND(stab[j].st_info)==STB_GLOBAL
2984 || ELF_ST_BIND(stab[j].st_info)==STB_LOCAL
2986 /* and not an undefined symbol */
2987 && stab[j].st_shndx != SHN_UNDEF
2988 /* and not in a "special section" */
2989 && stab[j].st_shndx < SHN_LORESERVE
2991 /* and it's a not a section or string table or anything silly */
2992 ( ELF_ST_TYPE(stab[j].st_info)==STT_FUNC ||
2993 ELF_ST_TYPE(stab[j].st_info)==STT_OBJECT ||
2994 ELF_ST_TYPE(stab[j].st_info)==STT_NOTYPE
2997 /* Section 0 is the undefined section, hence > and not >=. */
2998 ASSERT(secno > 0 && secno < ehdr->e_shnum);
3000 if (shdr[secno].sh_type == SHT_NOBITS) {
3001 debugBelch(" BSS symbol, size %d off %d name %s\n",
3002 stab[j].st_size, stab[j].st_value, nm);
3005 ad = ehdrC + shdr[ secno ].sh_offset + stab[j].st_value;
3006 if (ELF_ST_BIND(stab[j].st_info)==STB_LOCAL) {
3009 #ifdef ELF_FUNCTION_DESC
3010 /* dlsym() and the initialisation table both give us function
3011 * descriptors, so to be consistent we store function descriptors
3012 * in the symbol table */
3013 if (ELF_ST_TYPE(stab[j].st_info) == STT_FUNC)
3014 ad = (char *)allocateFunctionDesc((Elf_Addr)ad);
3016 IF_DEBUG(linker,debugBelch( "addOTabName(GLOB): %10p %s %s",
3017 ad, oc->fileName, nm ));
3022 /* And the decision is ... */
3026 oc->symbols[j] = nm;
3029 /* Ignore entirely. */
3031 ghciInsertStrHashTable(oc->fileName, symhash, nm, ad);
3035 IF_DEBUG(linker,debugBelch( "skipping `%s'\n",
3036 strtab + stab[j].st_name ));
3039 "skipping bind = %d, type = %d, shndx = %d `%s'\n",
3040 (int)ELF_ST_BIND(stab[j].st_info),
3041 (int)ELF_ST_TYPE(stab[j].st_info),
3042 (int)stab[j].st_shndx,
3043 strtab + stab[j].st_name
3046 oc->symbols[j] = NULL;
3055 /* Do ELF relocations which lack an explicit addend. All x86-linux
3056 relocations appear to be of this form. */
3058 do_Elf_Rel_relocations ( ObjectCode* oc, char* ehdrC,
3059 Elf_Shdr* shdr, int shnum,
3060 Elf_Sym* stab, char* strtab )
3065 Elf_Rel* rtab = (Elf_Rel*) (ehdrC + shdr[shnum].sh_offset);
3066 int nent = shdr[shnum].sh_size / sizeof(Elf_Rel);
3067 int target_shndx = shdr[shnum].sh_info;
3068 int symtab_shndx = shdr[shnum].sh_link;
3070 stab = (Elf_Sym*) (ehdrC + shdr[ symtab_shndx ].sh_offset);
3071 targ = (Elf_Word*)(ehdrC + shdr[ target_shndx ].sh_offset);
3072 IF_DEBUG(linker,debugBelch( "relocations for section %d using symtab %d\n",
3073 target_shndx, symtab_shndx ));
3075 /* Skip sections that we're not interested in. */
3078 SectionKind kind = getSectionKind_ELF(&shdr[target_shndx], &is_bss);
3079 if (kind == SECTIONKIND_OTHER) {
3080 IF_DEBUG(linker,debugBelch( "skipping (target section not loaded)"));
3085 for (j = 0; j < nent; j++) {
3086 Elf_Addr offset = rtab[j].r_offset;
3087 Elf_Addr info = rtab[j].r_info;
3089 Elf_Addr P = ((Elf_Addr)targ) + offset;
3090 Elf_Word* pP = (Elf_Word*)P;
3096 IF_DEBUG(linker,debugBelch( "Rel entry %3d is raw(%6p %6p)",
3097 j, (void*)offset, (void*)info ));
3099 IF_DEBUG(linker,debugBelch( " ZERO" ));
3102 Elf_Sym sym = stab[ELF_R_SYM(info)];
3103 /* First see if it is a local symbol. */
3104 if (ELF_ST_BIND(sym.st_info) == STB_LOCAL) {
3105 /* Yes, so we can get the address directly from the ELF symbol
3107 symbol = sym.st_name==0 ? "(noname)" : strtab+sym.st_name;
3109 (ehdrC + shdr[ sym.st_shndx ].sh_offset
3110 + stab[ELF_R_SYM(info)].st_value);
3113 /* No, so look up the name in our global table. */
3114 symbol = strtab + sym.st_name;
3115 S_tmp = lookupSymbol( symbol );
3116 S = (Elf_Addr)S_tmp;
3119 errorBelch("%s: unknown symbol `%s'", oc->fileName, symbol);
3122 IF_DEBUG(linker,debugBelch( "`%s' resolves to %p\n", symbol, (void*)S ));
3125 IF_DEBUG(linker,debugBelch( "Reloc: P = %p S = %p A = %p\n",
3126 (void*)P, (void*)S, (void*)A ));
3127 checkProddableBlock ( oc, pP );
3131 switch (ELF_R_TYPE(info)) {
3132 # ifdef i386_HOST_ARCH
3133 case R_386_32: *pP = value; break;
3134 case R_386_PC32: *pP = value - P; break;
3137 errorBelch("%s: unhandled ELF relocation(Rel) type %lu\n",
3138 oc->fileName, (lnat)ELF_R_TYPE(info));
3146 /* Do ELF relocations for which explicit addends are supplied.
3147 sparc-solaris relocations appear to be of this form. */
3149 do_Elf_Rela_relocations ( ObjectCode* oc, char* ehdrC,
3150 Elf_Shdr* shdr, int shnum,
3151 Elf_Sym* stab, char* strtab )
3154 char *symbol = NULL;
3156 Elf_Rela* rtab = (Elf_Rela*) (ehdrC + shdr[shnum].sh_offset);
3157 int nent = shdr[shnum].sh_size / sizeof(Elf_Rela);
3158 int target_shndx = shdr[shnum].sh_info;
3159 int symtab_shndx = shdr[shnum].sh_link;
3161 stab = (Elf_Sym*) (ehdrC + shdr[ symtab_shndx ].sh_offset);
3162 targ = (Elf_Addr) (ehdrC + shdr[ target_shndx ].sh_offset);
3163 IF_DEBUG(linker,debugBelch( "relocations for section %d using symtab %d\n",
3164 target_shndx, symtab_shndx ));
3166 for (j = 0; j < nent; j++) {
3167 #if defined(DEBUG) || defined(sparc_HOST_ARCH) || defined(ia64_HOST_ARCH) || defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH)
3168 /* This #ifdef only serves to avoid unused-var warnings. */
3169 Elf_Addr offset = rtab[j].r_offset;
3170 Elf_Addr P = targ + offset;
3172 Elf_Addr info = rtab[j].r_info;
3173 Elf_Addr A = rtab[j].r_addend;
3177 # if defined(sparc_HOST_ARCH)
3178 Elf_Word* pP = (Elf_Word*)P;
3180 # elif defined(ia64_HOST_ARCH)
3181 Elf64_Xword *pP = (Elf64_Xword *)P;
3183 # elif defined(powerpc_HOST_ARCH)
3187 IF_DEBUG(linker,debugBelch( "Rel entry %3d is raw(%6p %6p %6p) ",
3188 j, (void*)offset, (void*)info,
3191 IF_DEBUG(linker,debugBelch( " ZERO" ));
3194 Elf_Sym sym = stab[ELF_R_SYM(info)];
3195 /* First see if it is a local symbol. */
3196 if (ELF_ST_BIND(sym.st_info) == STB_LOCAL) {
3197 /* Yes, so we can get the address directly from the ELF symbol
3199 symbol = sym.st_name==0 ? "(noname)" : strtab+sym.st_name;
3201 (ehdrC + shdr[ sym.st_shndx ].sh_offset
3202 + stab[ELF_R_SYM(info)].st_value);
3203 #ifdef ELF_FUNCTION_DESC
3204 /* Make a function descriptor for this function */
3205 if (S && ELF_ST_TYPE(sym.st_info) == STT_FUNC) {
3206 S = allocateFunctionDesc(S + A);
3211 /* No, so look up the name in our global table. */
3212 symbol = strtab + sym.st_name;
3213 S_tmp = lookupSymbol( symbol );
3214 S = (Elf_Addr)S_tmp;
3216 #ifdef ELF_FUNCTION_DESC
3217 /* If a function, already a function descriptor - we would
3218 have to copy it to add an offset. */
3219 if (S && (ELF_ST_TYPE(sym.st_info) == STT_FUNC) && (A != 0))
3220 errorBelch("%s: function %s with addend %p", oc->fileName, symbol, (void *)A);
3224 errorBelch("%s: unknown symbol `%s'", oc->fileName, symbol);
3227 IF_DEBUG(linker,debugBelch( "`%s' resolves to %p", symbol, (void*)S ));
3230 IF_DEBUG(linker,debugBelch("Reloc: P = %p S = %p A = %p\n",
3231 (void*)P, (void*)S, (void*)A ));
3232 /* checkProddableBlock ( oc, (void*)P ); */
3236 switch (ELF_R_TYPE(info)) {
3237 # if defined(sparc_HOST_ARCH)
3238 case R_SPARC_WDISP30:
3239 w1 = *pP & 0xC0000000;
3240 w2 = (Elf_Word)((value - P) >> 2);
3241 ASSERT((w2 & 0xC0000000) == 0);
3246 w1 = *pP & 0xFFC00000;
3247 w2 = (Elf_Word)(value >> 10);
3248 ASSERT((w2 & 0xFFC00000) == 0);
3254 w2 = (Elf_Word)(value & 0x3FF);
3255 ASSERT((w2 & ~0x3FF) == 0);
3259 /* According to the Sun documentation:
3261 This relocation type resembles R_SPARC_32, except it refers to an
3262 unaligned word. That is, the word to be relocated must be treated
3263 as four separate bytes with arbitrary alignment, not as a word
3264 aligned according to the architecture requirements.
3266 (JRS: which means that freeloading on the R_SPARC_32 case
3267 is probably wrong, but hey ...)
3271 w2 = (Elf_Word)value;
3274 # elif defined(ia64_HOST_ARCH)
3275 case R_IA64_DIR64LSB:
3276 case R_IA64_FPTR64LSB:
3279 case R_IA64_PCREL64LSB:
3282 case R_IA64_SEGREL64LSB:
3283 addr = findElfSegment(ehdrC, value);
3286 case R_IA64_GPREL22:
3287 ia64_reloc_gprel22(P, value);
3289 case R_IA64_LTOFF22:
3290 case R_IA64_LTOFF22X:
3291 case R_IA64_LTOFF_FPTR22:
3292 addr = allocateGOTEntry(value);
3293 ia64_reloc_gprel22(P, addr);
3295 case R_IA64_PCREL21B:
3296 ia64_reloc_pcrel21(P, S, oc);
3299 /* This goes with R_IA64_LTOFF22X and points to the load to
3300 * convert into a move. We don't implement relaxation. */
3302 # elif defined(powerpc_HOST_ARCH)
3303 case R_PPC_ADDR16_LO:
3304 *(Elf32_Half*) P = value;
3307 case R_PPC_ADDR16_HI:
3308 *(Elf32_Half*) P = value >> 16;
3311 case R_PPC_ADDR16_HA:
3312 *(Elf32_Half*) P = (value + 0x8000) >> 16;
3316 *(Elf32_Word *) P = value;
3320 *(Elf32_Word *) P = value - P;
3326 if( delta << 6 >> 6 != delta )
3328 value = makeJumpIsland( oc, ELF_R_SYM(info), value );
3331 if( value == 0 || delta << 6 >> 6 != delta )
3333 barf( "Unable to make ppcJumpIsland for #%d",
3339 *(Elf_Word *) P = (*(Elf_Word *) P & 0xfc000003)
3340 | (delta & 0x3fffffc);
3344 #if x86_64_HOST_ARCH
3346 *(Elf64_Xword *)P = value;
3351 StgInt64 off = value - P;
3352 if (off >= 0x7fffffffL || off < -0x80000000L) {
3353 barf("R_X86_64_PC32 relocation out of range: %s = %p",
3356 *(Elf64_Word *)P = (Elf64_Word)off;
3361 if (value >= 0x7fffffffL) {
3362 barf("R_X86_64_32 relocation out of range: %s = %p\n",
3365 *(Elf64_Word *)P = (Elf64_Word)value;
3369 if ((StgInt64)value > 0x7fffffffL || (StgInt64)value < -0x80000000L) {
3370 barf("R_X86_64_32S relocation out of range: %s = %p\n",
3373 *(Elf64_Sword *)P = (Elf64_Sword)value;
3378 errorBelch("%s: unhandled ELF relocation(RelA) type %lu\n",
3379 oc->fileName, (lnat)ELF_R_TYPE(info));
3388 ocResolve_ELF ( ObjectCode* oc )
3392 Elf_Sym* stab = NULL;
3393 char* ehdrC = (char*)(oc->image);
3394 Elf_Ehdr* ehdr = (Elf_Ehdr*) ehdrC;
3395 Elf_Shdr* shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
3397 /* first find "the" symbol table */
3398 stab = (Elf_Sym*) findElfSection ( ehdrC, SHT_SYMTAB );
3400 /* also go find the string table */
3401 strtab = findElfSection ( ehdrC, SHT_STRTAB );
3403 if (stab == NULL || strtab == NULL) {
3404 errorBelch("%s: can't find string or symbol table", oc->fileName);
3408 /* Process the relocation sections. */
3409 for (shnum = 0; shnum < ehdr->e_shnum; shnum++) {
3410 if (shdr[shnum].sh_type == SHT_REL) {
3411 ok = do_Elf_Rel_relocations ( oc, ehdrC, shdr,
3412 shnum, stab, strtab );
3416 if (shdr[shnum].sh_type == SHT_RELA) {
3417 ok = do_Elf_Rela_relocations ( oc, ehdrC, shdr,
3418 shnum, stab, strtab );
3423 /* Free the local symbol table; we won't need it again. */
3424 freeHashTable(oc->lochash, NULL);
3427 #if defined(powerpc_HOST_ARCH)
3428 ocFlushInstructionCache( oc );
3436 * Instructions are 41 bits long, packed into 128 bit bundles with a 5-bit template
3437 * at the front. The following utility functions pack and unpack instructions, and
3438 * take care of the most common relocations.
3441 #ifdef ia64_HOST_ARCH
3444 ia64_extract_instruction(Elf64_Xword *target)
3447 int slot = (Elf_Addr)target & 3;
3448 target = (Elf_Addr)target & ~3;
3456 return ((w1 >> 5) & 0x1ffffffffff);
3458 return (w1 >> 46) | ((w2 & 0x7fffff) << 18);
3462 barf("ia64_extract_instruction: invalid slot %p", target);
3467 ia64_deposit_instruction(Elf64_Xword *target, Elf64_Xword value)
3469 int slot = (Elf_Addr)target & 3;
3470 target = (Elf_Addr)target & ~3;
3475 *target |= value << 5;
3478 *target |= value << 46;
3479 *(target+1) |= value >> 18;
3482 *(target+1) |= value << 23;
3488 ia64_reloc_gprel22(Elf_Addr target, Elf_Addr value)
3490 Elf64_Xword instruction;
3491 Elf64_Sxword rel_value;
3493 rel_value = value - gp_val;
3494 if ((rel_value > 0x1fffff) || (rel_value < -0x1fffff))
3495 barf("GP-relative data out of range (address = 0x%lx, gp = 0x%lx)", value, gp_val);
3497 instruction = ia64_extract_instruction((Elf64_Xword *)target);
3498 instruction |= (((rel_value >> 0) & 0x07f) << 13) /* imm7b */
3499 | (((rel_value >> 7) & 0x1ff) << 27) /* imm9d */
3500 | (((rel_value >> 16) & 0x01f) << 22) /* imm5c */
3501 | ((Elf64_Xword)(rel_value < 0) << 36); /* s */
3502 ia64_deposit_instruction((Elf64_Xword *)target, instruction);
3506 ia64_reloc_pcrel21(Elf_Addr target, Elf_Addr value, ObjectCode *oc)
3508 Elf64_Xword instruction;
3509 Elf64_Sxword rel_value;
3512 entry = allocatePLTEntry(value, oc);
3514 rel_value = (entry >> 4) - (target >> 4);
3515 if ((rel_value > 0xfffff) || (rel_value < -0xfffff))
3516 barf("PLT entry too far away (entry = 0x%lx, target = 0x%lx)", entry, target);
3518 instruction = ia64_extract_instruction((Elf64_Xword *)target);
3519 instruction |= ((rel_value & 0xfffff) << 13) /* imm20b */
3520 | ((Elf64_Xword)(rel_value < 0) << 36); /* s */
3521 ia64_deposit_instruction((Elf64_Xword *)target, instruction);
3527 * PowerPC ELF specifics
3530 #ifdef powerpc_HOST_ARCH
3532 static int ocAllocateJumpIslands_ELF( ObjectCode *oc )
3538 ehdr = (Elf_Ehdr *) oc->image;
3539 shdr = (Elf_Shdr *) ( ((char *)oc->image) + ehdr->e_shoff );
3541 for( i = 0; i < ehdr->e_shnum; i++ )
3542 if( shdr[i].sh_type == SHT_SYMTAB )
3545 if( i == ehdr->e_shnum )
3547 errorBelch( "This ELF file contains no symtab" );
3551 if( shdr[i].sh_entsize != sizeof( Elf_Sym ) )
3553 errorBelch( "The entry size (%d) of the symtab isn't %d\n",
3554 shdr[i].sh_entsize, sizeof( Elf_Sym ) );
3559 return ocAllocateJumpIslands( oc, shdr[i].sh_size / sizeof( Elf_Sym ), 0 );
3562 #endif /* powerpc */
3566 /* --------------------------------------------------------------------------
3568 * ------------------------------------------------------------------------*/
3570 #if defined(OBJFORMAT_MACHO)
3573 Support for MachO linking on Darwin/MacOS X
3574 by Wolfgang Thaller (wolfgang.thaller@gmx.net)
3576 I hereby formally apologize for the hackish nature of this code.
3577 Things that need to be done:
3578 *) implement ocVerifyImage_MachO
3579 *) add still more sanity checks.
3582 #ifdef powerpc_HOST_ARCH
3583 static int ocAllocateJumpIslands_MachO(ObjectCode* oc)
3585 struct mach_header *header = (struct mach_header *) oc->image;
3586 struct load_command *lc = (struct load_command *) (header + 1);
3589 for( i = 0; i < header->ncmds; i++ )
3591 if( lc->cmd == LC_SYMTAB )
3593 // Find out the first and last undefined external
3594 // symbol, so we don't have to allocate too many
3596 struct symtab_command *symLC = (struct symtab_command *) lc;
3597 unsigned min = symLC->nsyms, max = 0;
3598 struct nlist *nlist =
3599 symLC ? (struct nlist*) ((char*) oc->image + symLC->symoff)
3601 for(i=0;i<symLC->nsyms;i++)
3603 if(nlist[i].n_type & N_STAB)
3605 else if(nlist[i].n_type & N_EXT)
3607 if((nlist[i].n_type & N_TYPE) == N_UNDF
3608 && (nlist[i].n_value == 0))
3618 return ocAllocateJumpIslands(oc, max - min + 1, min);
3623 lc = (struct load_command *) ( ((char *)lc) + lc->cmdsize );
3625 return ocAllocateJumpIslands(oc,0,0);
3629 static int ocVerifyImage_MachO(ObjectCode* oc STG_UNUSED)
3631 // FIXME: do some verifying here
3635 static int resolveImports(
3638 struct symtab_command *symLC,
3639 struct section *sect, // ptr to lazy or non-lazy symbol pointer section
3640 unsigned long *indirectSyms,
3641 struct nlist *nlist)
3645 for(i=0;i*4<sect->size;i++)
3647 // according to otool, reserved1 contains the first index into the indirect symbol table
3648 struct nlist *symbol = &nlist[indirectSyms[sect->reserved1+i]];
3649 char *nm = image + symLC->stroff + symbol->n_un.n_strx;
3652 if((symbol->n_type & N_TYPE) == N_UNDF
3653 && (symbol->n_type & N_EXT) && (symbol->n_value != 0))
3654 addr = (void*) (symbol->n_value);
3655 else if((addr = lookupLocalSymbol(oc,nm)) != NULL)
3658 addr = lookupSymbol(nm);
3661 errorBelch("\n%s: unknown symbol `%s'", oc->fileName, nm);
3665 checkProddableBlock(oc,((void**)(image + sect->offset)) + i);
3666 ((void**)(image + sect->offset))[i] = addr;
3672 static unsigned long relocateAddress(
3675 struct section* sections,
3676 unsigned long address)
3679 for(i = 0; i < nSections; i++)
3681 if(sections[i].addr <= address
3682 && address < sections[i].addr + sections[i].size)
3684 return (unsigned long)oc->image
3685 + sections[i].offset + address - sections[i].addr;
3688 barf("Invalid Mach-O file:"
3689 "Address out of bounds while relocating object file");
3693 static int relocateSection(
3696 struct symtab_command *symLC, struct nlist *nlist,
3697 int nSections, struct section* sections, struct section *sect)
3699 struct relocation_info *relocs;
3702 if(!strcmp(sect->sectname,"__la_symbol_ptr"))
3704 else if(!strcmp(sect->sectname,"__nl_symbol_ptr"))
3706 else if(!strcmp(sect->sectname,"__la_sym_ptr2"))
3708 else if(!strcmp(sect->sectname,"__la_sym_ptr3"))
3712 relocs = (struct relocation_info*) (image + sect->reloff);
3716 if(relocs[i].r_address & R_SCATTERED)
3718 struct scattered_relocation_info *scat =
3719 (struct scattered_relocation_info*) &relocs[i];
3723 if(scat->r_length == 2)
3725 unsigned long word = 0;
3726 unsigned long* wordPtr = (unsigned long*) (image + sect->offset + scat->r_address);
3727 checkProddableBlock(oc,wordPtr);
3729 // Note on relocation types:
3730 // i386 uses the GENERIC_RELOC_* types,
3731 // while ppc uses special PPC_RELOC_* types.
3732 // *_RELOC_VANILLA and *_RELOC_PAIR have the same value
3733 // in both cases, all others are different.
3734 // Therefore, we use GENERIC_RELOC_VANILLA
3735 // and GENERIC_RELOC_PAIR instead of the PPC variants,
3736 // and use #ifdefs for the other types.
3738 // Step 1: Figure out what the relocated value should be
3739 if(scat->r_type == GENERIC_RELOC_VANILLA)
3741 word = *wordPtr + (unsigned long) relocateAddress(
3748 #ifdef powerpc_HOST_ARCH
3749 else if(scat->r_type == PPC_RELOC_SECTDIFF
3750 || scat->r_type == PPC_RELOC_LO16_SECTDIFF
3751 || scat->r_type == PPC_RELOC_HI16_SECTDIFF
3752 || scat->r_type == PPC_RELOC_HA16_SECTDIFF)
3754 else if(scat->r_type == GENERIC_RELOC_SECTDIFF)
3757 struct scattered_relocation_info *pair =
3758 (struct scattered_relocation_info*) &relocs[i+1];
3760 if(!pair->r_scattered || pair->r_type != GENERIC_RELOC_PAIR)
3761 barf("Invalid Mach-O file: "
3762 "RELOC_*_SECTDIFF not followed by RELOC_PAIR");
3764 word = (unsigned long)
3765 (relocateAddress(oc, nSections, sections, scat->r_value)
3766 - relocateAddress(oc, nSections, sections, pair->r_value));
3769 #ifdef powerpc_HOST_ARCH
3770 else if(scat->r_type == PPC_RELOC_HI16
3771 || scat->r_type == PPC_RELOC_LO16
3772 || scat->r_type == PPC_RELOC_HA16
3773 || scat->r_type == PPC_RELOC_LO14)
3774 { // these are generated by label+offset things
3775 struct relocation_info *pair = &relocs[i+1];
3776 if((pair->r_address & R_SCATTERED) || pair->r_type != PPC_RELOC_PAIR)
3777 barf("Invalid Mach-O file: "
3778 "PPC_RELOC_* not followed by PPC_RELOC_PAIR");
3780 if(scat->r_type == PPC_RELOC_LO16)
3782 word = ((unsigned short*) wordPtr)[1];
3783 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
3785 else if(scat->r_type == PPC_RELOC_LO14)
3787 barf("Unsupported Relocation: PPC_RELOC_LO14");
3788 word = ((unsigned short*) wordPtr)[1] & 0xFFFC;
3789 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
3791 else if(scat->r_type == PPC_RELOC_HI16)
3793 word = ((unsigned short*) wordPtr)[1] << 16;
3794 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF);
3796 else if(scat->r_type == PPC_RELOC_HA16)
3798 word = ((unsigned short*) wordPtr)[1] << 16;
3799 word += ((short)relocs[i+1].r_address & (short)0xFFFF);
3803 word += (unsigned long) relocateAddress(oc, nSections, sections, scat->r_value)
3810 continue; // ignore the others
3812 #ifdef powerpc_HOST_ARCH
3813 if(scat->r_type == GENERIC_RELOC_VANILLA
3814 || scat->r_type == PPC_RELOC_SECTDIFF)
3816 if(scat->r_type == GENERIC_RELOC_VANILLA
3817 || scat->r_type == GENERIC_RELOC_SECTDIFF)
3822 #ifdef powerpc_HOST_ARCH
3823 else if(scat->r_type == PPC_RELOC_LO16_SECTDIFF || scat->r_type == PPC_RELOC_LO16)
3825 ((unsigned short*) wordPtr)[1] = word & 0xFFFF;
3827 else if(scat->r_type == PPC_RELOC_HI16_SECTDIFF || scat->r_type == PPC_RELOC_HI16)
3829 ((unsigned short*) wordPtr)[1] = (word >> 16) & 0xFFFF;
3831 else if(scat->r_type == PPC_RELOC_HA16_SECTDIFF || scat->r_type == PPC_RELOC_HA16)
3833 ((unsigned short*) wordPtr)[1] = ((word >> 16) & 0xFFFF)
3834 + ((word & (1<<15)) ? 1 : 0);
3840 continue; // FIXME: I hope it's OK to ignore all the others.
3844 struct relocation_info *reloc = &relocs[i];
3845 if(reloc->r_pcrel && !reloc->r_extern)
3848 if(reloc->r_length == 2)
3850 unsigned long word = 0;
3851 #ifdef powerpc_HOST_ARCH
3852 unsigned long jumpIsland = 0;
3853 long offsetToJumpIsland = 0xBADBAD42; // initialise to bad value
3854 // to avoid warning and to catch
3858 unsigned long* wordPtr = (unsigned long*) (image + sect->offset + reloc->r_address);
3859 checkProddableBlock(oc,wordPtr);
3861 if(reloc->r_type == GENERIC_RELOC_VANILLA)
3865 #ifdef powerpc_HOST_ARCH
3866 else if(reloc->r_type == PPC_RELOC_LO16)
3868 word = ((unsigned short*) wordPtr)[1];
3869 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
3871 else if(reloc->r_type == PPC_RELOC_HI16)
3873 word = ((unsigned short*) wordPtr)[1] << 16;
3874 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF);
3876 else if(reloc->r_type == PPC_RELOC_HA16)
3878 word = ((unsigned short*) wordPtr)[1] << 16;
3879 word += ((short)relocs[i+1].r_address & (short)0xFFFF);
3881 else if(reloc->r_type == PPC_RELOC_BR24)
3884 word = (word & 0x03FFFFFC) | ((word & 0x02000000) ? 0xFC000000 : 0);
3888 if(!reloc->r_extern)
3891 sections[reloc->r_symbolnum-1].offset
3892 - sections[reloc->r_symbolnum-1].addr
3899 struct nlist *symbol = &nlist[reloc->r_symbolnum];
3900 char *nm = image + symLC->stroff + symbol->n_un.n_strx;
3901 void *symbolAddress = lookupSymbol(nm);
3904 errorBelch("\nunknown symbol `%s'", nm);
3910 #ifdef powerpc_HOST_ARCH
3911 // In the .o file, this should be a relative jump to NULL
3912 // and we'll change it to a relative jump to the symbol
3913 ASSERT(-word == reloc->r_address);
3914 jumpIsland = makeJumpIsland(oc,reloc->r_symbolnum,(unsigned long) symbolAddress);
3917 offsetToJumpIsland = word + jumpIsland
3918 - (((long)image) + sect->offset - sect->addr);
3921 word += (unsigned long) symbolAddress
3922 - (((long)image) + sect->offset - sect->addr);
3926 word += (unsigned long) symbolAddress;
3930 if(reloc->r_type == GENERIC_RELOC_VANILLA)
3935 #ifdef powerpc_HOST_ARCH
3936 else if(reloc->r_type == PPC_RELOC_LO16)
3938 ((unsigned short*) wordPtr)[1] = word & 0xFFFF;
3941 else if(reloc->r_type == PPC_RELOC_HI16)
3943 ((unsigned short*) wordPtr)[1] = (word >> 16) & 0xFFFF;
3946 else if(reloc->r_type == PPC_RELOC_HA16)
3948 ((unsigned short*) wordPtr)[1] = ((word >> 16) & 0xFFFF)
3949 + ((word & (1<<15)) ? 1 : 0);
3952 else if(reloc->r_type == PPC_RELOC_BR24)
3954 if((long)word > (long)0x01FFFFFF || (long)word < (long)0xFFE00000)
3956 // The branch offset is too large.
3957 // Therefore, we try to use a jump island.
3960 barf("unconditional relative branch out of range: "
3961 "no jump island available");
3964 word = offsetToJumpIsland;
3965 if((long)word > (long)0x01FFFFFF || (long)word < (long)0xFFE00000)
3966 barf("unconditional relative branch out of range: "
3967 "jump island out of range");
3969 *wordPtr = (*wordPtr & 0xFC000003) | (word & 0x03FFFFFC);
3974 barf("\nunknown relocation %d",reloc->r_type);
3981 static int ocGetNames_MachO(ObjectCode* oc)
3983 char *image = (char*) oc->image;
3984 struct mach_header *header = (struct mach_header*) image;
3985 struct load_command *lc = (struct load_command*) (image + sizeof(struct mach_header));
3986 unsigned i,curSymbol = 0;
3987 struct segment_command *segLC = NULL;
3988 struct section *sections;
3989 struct symtab_command *symLC = NULL;
3990 struct nlist *nlist;
3991 unsigned long commonSize = 0;
3992 char *commonStorage = NULL;
3993 unsigned long commonCounter;
3995 for(i=0;i<header->ncmds;i++)
3997 if(lc->cmd == LC_SEGMENT)
3998 segLC = (struct segment_command*) lc;
3999 else if(lc->cmd == LC_SYMTAB)
4000 symLC = (struct symtab_command*) lc;
4001 lc = (struct load_command *) ( ((char*)lc) + lc->cmdsize );
4004 sections = (struct section*) (segLC+1);
4005 nlist = symLC ? (struct nlist*) (image + symLC->symoff)
4008 for(i=0;i<segLC->nsects;i++)
4010 if(sections[i].size == 0)
4013 if((sections[i].flags & SECTION_TYPE) == S_ZEROFILL)
4015 char * zeroFillArea = stgCallocBytes(1,sections[i].size,
4016 "ocGetNames_MachO(common symbols)");
4017 sections[i].offset = zeroFillArea - image;
4020 if(!strcmp(sections[i].sectname,"__text"))
4021 addSection(oc, SECTIONKIND_CODE_OR_RODATA,
4022 (void*) (image + sections[i].offset),
4023 (void*) (image + sections[i].offset + sections[i].size));
4024 else if(!strcmp(sections[i].sectname,"__const"))
4025 addSection(oc, SECTIONKIND_RWDATA,
4026 (void*) (image + sections[i].offset),
4027 (void*) (image + sections[i].offset + sections[i].size));
4028 else if(!strcmp(sections[i].sectname,"__data"))
4029 addSection(oc, SECTIONKIND_RWDATA,
4030 (void*) (image + sections[i].offset),
4031 (void*) (image + sections[i].offset + sections[i].size));
4032 else if(!strcmp(sections[i].sectname,"__bss")
4033 || !strcmp(sections[i].sectname,"__common"))
4034 addSection(oc, SECTIONKIND_RWDATA,
4035 (void*) (image + sections[i].offset),
4036 (void*) (image + sections[i].offset + sections[i].size));
4038 addProddableBlock(oc, (void*) (image + sections[i].offset),
4042 // count external symbols defined here
4046 for(i=0;i<symLC->nsyms;i++)
4048 if(nlist[i].n_type & N_STAB)
4050 else if(nlist[i].n_type & N_EXT)
4052 if((nlist[i].n_type & N_TYPE) == N_UNDF
4053 && (nlist[i].n_value != 0))
4055 commonSize += nlist[i].n_value;
4058 else if((nlist[i].n_type & N_TYPE) == N_SECT)
4063 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
4064 "ocGetNames_MachO(oc->symbols)");
4068 for(i=0;i<symLC->nsyms;i++)
4070 if(nlist[i].n_type & N_STAB)
4072 else if((nlist[i].n_type & N_TYPE) == N_SECT)
4074 if(nlist[i].n_type & N_EXT)
4076 char *nm = image + symLC->stroff + nlist[i].n_un.n_strx;
4077 ghciInsertStrHashTable(oc->fileName, symhash, nm,
4079 + sections[nlist[i].n_sect-1].offset
4080 - sections[nlist[i].n_sect-1].addr
4081 + nlist[i].n_value);
4082 oc->symbols[curSymbol++] = nm;
4086 char *nm = image + symLC->stroff + nlist[i].n_un.n_strx;
4087 ghciInsertStrHashTable(oc->fileName, oc->lochash, nm,
4089 + sections[nlist[i].n_sect-1].offset
4090 - sections[nlist[i].n_sect-1].addr
4091 + nlist[i].n_value);
4097 commonStorage = stgCallocBytes(1,commonSize,"ocGetNames_MachO(common symbols)");
4098 commonCounter = (unsigned long)commonStorage;
4101 for(i=0;i<symLC->nsyms;i++)
4103 if((nlist[i].n_type & N_TYPE) == N_UNDF
4104 && (nlist[i].n_type & N_EXT) && (nlist[i].n_value != 0))
4106 char *nm = image + symLC->stroff + nlist[i].n_un.n_strx;
4107 unsigned long sz = nlist[i].n_value;
4109 nlist[i].n_value = commonCounter;
4111 ghciInsertStrHashTable(oc->fileName, symhash, nm,
4112 (void*)commonCounter);
4113 oc->symbols[curSymbol++] = nm;
4115 commonCounter += sz;
4122 static int ocResolve_MachO(ObjectCode* oc)
4124 char *image = (char*) oc->image;
4125 struct mach_header *header = (struct mach_header*) image;
4126 struct load_command *lc = (struct load_command*) (image + sizeof(struct mach_header));
4128 struct segment_command *segLC = NULL;
4129 struct section *sections, *la_ptrs = NULL, *nl_ptrs = NULL;
4130 struct symtab_command *symLC = NULL;
4131 struct dysymtab_command *dsymLC = NULL;
4132 struct nlist *nlist;
4134 for(i=0;i<header->ncmds;i++)
4136 if(lc->cmd == LC_SEGMENT)
4137 segLC = (struct segment_command*) lc;
4138 else if(lc->cmd == LC_SYMTAB)
4139 symLC = (struct symtab_command*) lc;
4140 else if(lc->cmd == LC_DYSYMTAB)
4141 dsymLC = (struct dysymtab_command*) lc;
4142 lc = (struct load_command *) ( ((char*)lc) + lc->cmdsize );
4145 sections = (struct section*) (segLC+1);
4146 nlist = symLC ? (struct nlist*) (image + symLC->symoff)
4149 for(i=0;i<segLC->nsects;i++)
4151 if(!strcmp(sections[i].sectname,"__la_symbol_ptr"))
4152 la_ptrs = §ions[i];
4153 else if(!strcmp(sections[i].sectname,"__nl_symbol_ptr"))
4154 nl_ptrs = §ions[i];
4155 else if(!strcmp(sections[i].sectname,"__la_sym_ptr2"))
4156 la_ptrs = §ions[i];
4157 else if(!strcmp(sections[i].sectname,"__la_sym_ptr3"))
4158 la_ptrs = §ions[i];
4163 unsigned long *indirectSyms
4164 = (unsigned long*) (image + dsymLC->indirectsymoff);
4167 if(!resolveImports(oc,image,symLC,la_ptrs,indirectSyms,nlist))
4170 if(!resolveImports(oc,image,symLC,nl_ptrs,indirectSyms,nlist))
4174 for(i=0;i<segLC->nsects;i++)
4176 if(!relocateSection(oc,image,symLC,nlist,segLC->nsects,sections,§ions[i]))
4180 /* Free the local symbol table; we won't need it again. */
4181 freeHashTable(oc->lochash, NULL);
4184 #if defined (powerpc_HOST_ARCH)
4185 ocFlushInstructionCache( oc );
4191 #ifdef powerpc_HOST_ARCH
4193 * The Mach-O object format uses leading underscores. But not everywhere.
4194 * There is a small number of runtime support functions defined in
4195 * libcc_dynamic.a whose name does not have a leading underscore.
4196 * As a consequence, we can't get their address from C code.
4197 * We have to use inline assembler just to take the address of a function.
4201 static void machoInitSymbolsWithoutUnderscore()
4203 extern void* symbolsWithoutUnderscore[];
4204 void **p = symbolsWithoutUnderscore;
4205 __asm__ volatile(".globl _symbolsWithoutUnderscore\n.data\n_symbolsWithoutUnderscore:");
4209 __asm__ volatile(".long " # x);
4211 RTS_MACHO_NOUNDERLINE_SYMBOLS
4213 __asm__ volatile(".text");
4217 ghciInsertStrHashTable("(GHCi built-in symbols)", symhash, #x, *p++);
4219 RTS_MACHO_NOUNDERLINE_SYMBOLS
4226 * Figure out by how much to shift the entire Mach-O file in memory
4227 * when loading so that its single segment ends up 16-byte-aligned
4229 static int machoGetMisalignment( FILE * f )
4231 struct mach_header header;
4234 fread(&header, sizeof(header), 1, f);
4237 if(header.magic != MH_MAGIC)
4240 misalignment = (header.sizeofcmds + sizeof(header))
4243 return misalignment ? (16 - misalignment) : 0;