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"
31 #ifdef HAVE_SYS_TYPES_H
32 #include <sys/types.h>
38 #ifdef HAVE_SYS_STAT_H
42 #if defined(HAVE_DLFCN_H)
46 #if defined(cygwin32_HOST_OS)
51 #ifdef HAVE_SYS_TIME_H
55 #include <sys/fcntl.h>
56 #include <sys/termios.h>
57 #include <sys/utime.h>
58 #include <sys/utsname.h>
62 #if defined(ia64_HOST_ARCH) || defined(openbsd_HOST_OS) || defined(linux_HOST_OS) || defined(freebsd_HOST_OS)
67 #if defined(openbsd_HOST_OS) || defined(linux_HOST_OS) || defined(freebsd_HOST_OS)
75 #if defined(linux_HOST_OS) || defined(solaris2_HOST_OS) || defined(freebsd_HOST_OS) || defined(netbsd_HOST_OS) || defined(openbsd_HOST_OS)
76 # define OBJFORMAT_ELF
77 #elif defined(cygwin32_HOST_OS) || defined (mingw32_HOST_OS)
78 # define OBJFORMAT_PEi386
81 #elif defined(darwin_HOST_OS)
82 # define OBJFORMAT_MACHO
83 # include <mach-o/loader.h>
84 # include <mach-o/nlist.h>
85 # include <mach-o/reloc.h>
86 # include <mach-o/dyld.h>
87 #if defined(powerpc_HOST_ARCH)
88 # include <mach-o/ppc/reloc.h>
92 /* Hash table mapping symbol names to Symbol */
93 static /*Str*/HashTable *symhash;
99 /* Hash table mapping symbol names to StgStablePtr */
100 static /*Str*/HashTable *stablehash;
101 rootEntry *root_ptr_table = NULL;
102 static rootEntry *root_ptr_free = NULL;
104 static unsigned int RPT_size = 0;
106 /* List of currently loaded objects */
107 ObjectCode *objects = NULL; /* initially empty */
109 #if defined(OBJFORMAT_ELF)
110 static int ocVerifyImage_ELF ( ObjectCode* oc );
111 static int ocGetNames_ELF ( ObjectCode* oc );
112 static int ocResolve_ELF ( ObjectCode* oc );
113 #if defined(powerpc_HOST_ARCH)
114 static int ocAllocateJumpIslands_ELF ( ObjectCode* oc );
116 #elif defined(OBJFORMAT_PEi386)
117 static int ocVerifyImage_PEi386 ( ObjectCode* oc );
118 static int ocGetNames_PEi386 ( ObjectCode* oc );
119 static int ocResolve_PEi386 ( ObjectCode* oc );
120 #elif defined(OBJFORMAT_MACHO)
121 static int ocVerifyImage_MachO ( ObjectCode* oc );
122 static int ocGetNames_MachO ( ObjectCode* oc );
123 static int ocResolve_MachO ( ObjectCode* oc );
125 static int machoGetMisalignment( FILE * );
126 #ifdef powerpc_HOST_ARCH
127 static int ocAllocateJumpIslands_MachO ( ObjectCode* oc );
128 static void machoInitSymbolsWithoutUnderscore( void );
132 #if defined(x86_64_HOST_ARCH)
133 static void*x86_64_high_symbol( char *lbl, void *addr );
136 /* -----------------------------------------------------------------------------
137 * Built-in symbols from the RTS
140 typedef struct _RtsSymbolVal {
147 #define Maybe_Stable_Names SymX(mkWeakzh_fast) \
148 SymX(makeStableNamezh_fast) \
149 SymX(finalizzeWeakzh_fast)
151 /* These are not available in GUM!!! -- HWL */
152 #define Maybe_Stable_Names
155 #if !defined (mingw32_HOST_OS)
156 #define RTS_POSIX_ONLY_SYMBOLS \
157 SymX(signal_handlers) \
158 SymX(stg_sig_install) \
162 #if defined (cygwin32_HOST_OS)
163 #define RTS_MINGW_ONLY_SYMBOLS /**/
164 /* Don't have the ability to read import libs / archives, so
165 * we have to stupidly list a lot of what libcygwin.a
168 #define RTS_CYGWIN_ONLY_SYMBOLS \
246 #elif !defined(mingw32_HOST_OS)
247 #define RTS_MINGW_ONLY_SYMBOLS /**/
248 #define RTS_CYGWIN_ONLY_SYMBOLS /**/
249 #else /* defined(mingw32_HOST_OS) */
250 #define RTS_POSIX_ONLY_SYMBOLS /**/
251 #define RTS_CYGWIN_ONLY_SYMBOLS /**/
253 /* Extra syms gen'ed by mingw-2's gcc-3.2: */
255 #define RTS_MINGW_EXTRA_SYMS \
256 Sym(_imp____mb_cur_max) \
259 #define RTS_MINGW_EXTRA_SYMS
262 /* These are statically linked from the mingw libraries into the ghc
263 executable, so we have to employ this hack. */
264 #define RTS_MINGW_ONLY_SYMBOLS \
265 SymX(asyncReadzh_fast) \
266 SymX(asyncWritezh_fast) \
267 SymX(asyncDoProczh_fast) \
279 SymX(getservbyname) \
280 SymX(getservbyport) \
281 SymX(getprotobynumber) \
282 SymX(getprotobyname) \
283 SymX(gethostbyname) \
284 SymX(gethostbyaddr) \
331 SymX(rts_InstallConsoleEvent) \
332 SymX(rts_ConsoleHandlerDone) \
334 Sym(_imp___timezone) \
344 RTS_MINGW_EXTRA_SYMS \
348 #if defined(darwin_TARGET_OS) && HAVE_PRINTF_LDBLSTUB
349 #define RTS_DARWIN_ONLY_SYMBOLS \
350 Sym(asprintf$LDBLStub) \
354 Sym(fprintf$LDBLStub) \
355 Sym(fscanf$LDBLStub) \
356 Sym(fwprintf$LDBLStub) \
357 Sym(fwscanf$LDBLStub) \
358 Sym(printf$LDBLStub) \
359 Sym(scanf$LDBLStub) \
360 Sym(snprintf$LDBLStub) \
361 Sym(sprintf$LDBLStub) \
362 Sym(sscanf$LDBLStub) \
363 Sym(strtold$LDBLStub) \
364 Sym(swprintf$LDBLStub) \
365 Sym(swscanf$LDBLStub) \
366 Sym(syslog$LDBLStub) \
367 Sym(vasprintf$LDBLStub) \
369 Sym(verrc$LDBLStub) \
370 Sym(verrx$LDBLStub) \
371 Sym(vfprintf$LDBLStub) \
372 Sym(vfscanf$LDBLStub) \
373 Sym(vfwprintf$LDBLStub) \
374 Sym(vfwscanf$LDBLStub) \
375 Sym(vprintf$LDBLStub) \
376 Sym(vscanf$LDBLStub) \
377 Sym(vsnprintf$LDBLStub) \
378 Sym(vsprintf$LDBLStub) \
379 Sym(vsscanf$LDBLStub) \
380 Sym(vswprintf$LDBLStub) \
381 Sym(vswscanf$LDBLStub) \
382 Sym(vsyslog$LDBLStub) \
383 Sym(vwarn$LDBLStub) \
384 Sym(vwarnc$LDBLStub) \
385 Sym(vwarnx$LDBLStub) \
386 Sym(vwprintf$LDBLStub) \
387 Sym(vwscanf$LDBLStub) \
389 Sym(warnc$LDBLStub) \
390 Sym(warnx$LDBLStub) \
391 Sym(wcstold$LDBLStub) \
392 Sym(wprintf$LDBLStub) \
395 #define RTS_DARWIN_ONLY_SYMBOLS
399 # define MAIN_CAP_SYM SymX(MainCapability)
401 # define MAIN_CAP_SYM
404 #if !defined(mingw32_HOST_OS)
405 #define RTS_USER_SIGNALS_SYMBOLS \
406 SymX(setIOManagerPipe)
408 #define RTS_USER_SIGNALS_SYMBOLS /* nothing */
411 #ifdef TABLES_NEXT_TO_CODE
412 #define RTS_RET_SYMBOLS /* nothing */
414 #define RTS_RET_SYMBOLS \
415 SymX(stg_enter_ret) \
416 SymX(stg_gc_fun_ret) \
423 SymX(stg_ap_pv_ret) \
424 SymX(stg_ap_pp_ret) \
425 SymX(stg_ap_ppv_ret) \
426 SymX(stg_ap_ppp_ret) \
427 SymX(stg_ap_pppv_ret) \
428 SymX(stg_ap_pppp_ret) \
429 SymX(stg_ap_ppppp_ret) \
430 SymX(stg_ap_pppppp_ret)
433 #define RTS_SYMBOLS \
436 SymX(stg_enter_info) \
437 SymX(stg_gc_void_info) \
438 SymX(__stg_gc_enter_1) \
439 SymX(stg_gc_noregs) \
440 SymX(stg_gc_unpt_r1_info) \
441 SymX(stg_gc_unpt_r1) \
442 SymX(stg_gc_unbx_r1_info) \
443 SymX(stg_gc_unbx_r1) \
444 SymX(stg_gc_f1_info) \
446 SymX(stg_gc_d1_info) \
448 SymX(stg_gc_l1_info) \
451 SymX(stg_gc_fun_info) \
453 SymX(stg_gc_gen_info) \
454 SymX(stg_gc_gen_hp) \
456 SymX(stg_gen_yield) \
457 SymX(stg_yield_noregs) \
458 SymX(stg_yield_to_interpreter) \
459 SymX(stg_gen_block) \
460 SymX(stg_block_noregs) \
462 SymX(stg_block_takemvar) \
463 SymX(stg_block_putmvar) \
464 SymX(stg_seq_frame_info) \
466 SymX(MallocFailHook) \
468 SymX(OutOfHeapHook) \
469 SymX(StackOverflowHook) \
470 SymX(__encodeDouble) \
471 SymX(__encodeFloat) \
475 SymX(__gmpz_cmp_si) \
476 SymX(__gmpz_cmp_ui) \
477 SymX(__gmpz_get_si) \
478 SymX(__gmpz_get_ui) \
479 SymX(__int_encodeDouble) \
480 SymX(__int_encodeFloat) \
481 SymX(andIntegerzh_fast) \
482 SymX(atomicallyzh_fast) \
486 SymX(blockAsyncExceptionszh_fast) \
488 SymX(catchRetryzh_fast) \
489 SymX(catchSTMzh_fast) \
490 SymX(closure_flags) \
492 SymX(cmpIntegerzh_fast) \
493 SymX(cmpIntegerIntzh_fast) \
494 SymX(complementIntegerzh_fast) \
495 SymX(createAdjustor) \
496 SymX(decodeDoublezh_fast) \
497 SymX(decodeFloatzh_fast) \
500 SymX(deRefWeakzh_fast) \
501 SymX(deRefStablePtrzh_fast) \
502 SymX(dirty_MUT_VAR) \
503 SymX(divExactIntegerzh_fast) \
504 SymX(divModIntegerzh_fast) \
506 SymX(forkOnzh_fast) \
508 SymX(forkOS_createThread) \
509 SymX(freeHaskellFunctionPtr) \
510 SymX(freeStablePtr) \
511 SymX(gcdIntegerzh_fast) \
512 SymX(gcdIntegerIntzh_fast) \
513 SymX(gcdIntzh_fast) \
522 SymX(hs_perform_gc) \
523 SymX(hs_free_stable_ptr) \
524 SymX(hs_free_fun_ptr) \
526 SymX(int2Integerzh_fast) \
527 SymX(integer2Intzh_fast) \
528 SymX(integer2Wordzh_fast) \
529 SymX(isCurrentThreadBoundzh_fast) \
530 SymX(isDoubleDenormalized) \
531 SymX(isDoubleInfinite) \
533 SymX(isDoubleNegativeZero) \
534 SymX(isEmptyMVarzh_fast) \
535 SymX(isFloatDenormalized) \
536 SymX(isFloatInfinite) \
538 SymX(isFloatNegativeZero) \
539 SymX(killThreadzh_fast) \
541 SymX(insertStableSymbol) \
544 SymX(makeStablePtrzh_fast) \
545 SymX(minusIntegerzh_fast) \
546 SymX(mkApUpd0zh_fast) \
547 SymX(myThreadIdzh_fast) \
548 SymX(labelThreadzh_fast) \
549 SymX(newArrayzh_fast) \
550 SymX(newBCOzh_fast) \
551 SymX(newByteArrayzh_fast) \
552 SymX_redirect(newCAF, newDynCAF) \
553 SymX(newMVarzh_fast) \
554 SymX(newMutVarzh_fast) \
555 SymX(newTVarzh_fast) \
556 SymX(atomicModifyMutVarzh_fast) \
557 SymX(newPinnedByteArrayzh_fast) \
559 SymX(orIntegerzh_fast) \
561 SymX(performMajorGC) \
562 SymX(plusIntegerzh_fast) \
565 SymX(putMVarzh_fast) \
566 SymX(quotIntegerzh_fast) \
567 SymX(quotRemIntegerzh_fast) \
569 SymX(raiseIOzh_fast) \
570 SymX(readTVarzh_fast) \
571 SymX(remIntegerzh_fast) \
572 SymX(resetNonBlockingFd) \
577 SymX(rts_checkSchedStatus) \
580 SymX(rts_evalLazyIO) \
581 SymX(rts_evalStableIO) \
585 SymX(rts_getDouble) \
590 SymX(rts_getFunPtr) \
591 SymX(rts_getStablePtr) \
592 SymX(rts_getThreadId) \
594 SymX(rts_getWord32) \
607 SymX(rts_mkStablePtr) \
615 SymX(rtsSupportsBoundThreads) \
616 SymX(__hscore_get_saved_termios) \
617 SymX(__hscore_set_saved_termios) \
619 SymX(startupHaskell) \
620 SymX(shutdownHaskell) \
621 SymX(shutdownHaskellAndExit) \
622 SymX(stable_ptr_table) \
623 SymX(stackOverflow) \
624 SymX(stg_CAF_BLACKHOLE_info) \
625 SymX(awakenBlockedQueue) \
626 SymX(stg_CHARLIKE_closure) \
627 SymX(stg_EMPTY_MVAR_info) \
628 SymX(stg_IND_STATIC_info) \
629 SymX(stg_INTLIKE_closure) \
630 SymX(stg_MUT_ARR_PTRS_DIRTY_info) \
631 SymX(stg_MUT_ARR_PTRS_FROZEN_info) \
632 SymX(stg_MUT_ARR_PTRS_FROZEN0_info) \
633 SymX(stg_WEAK_info) \
634 SymX(stg_ap_v_info) \
635 SymX(stg_ap_f_info) \
636 SymX(stg_ap_d_info) \
637 SymX(stg_ap_l_info) \
638 SymX(stg_ap_n_info) \
639 SymX(stg_ap_p_info) \
640 SymX(stg_ap_pv_info) \
641 SymX(stg_ap_pp_info) \
642 SymX(stg_ap_ppv_info) \
643 SymX(stg_ap_ppp_info) \
644 SymX(stg_ap_pppv_info) \
645 SymX(stg_ap_pppp_info) \
646 SymX(stg_ap_ppppp_info) \
647 SymX(stg_ap_pppppp_info) \
648 SymX(stg_ap_0_fast) \
649 SymX(stg_ap_v_fast) \
650 SymX(stg_ap_f_fast) \
651 SymX(stg_ap_d_fast) \
652 SymX(stg_ap_l_fast) \
653 SymX(stg_ap_n_fast) \
654 SymX(stg_ap_p_fast) \
655 SymX(stg_ap_pv_fast) \
656 SymX(stg_ap_pp_fast) \
657 SymX(stg_ap_ppv_fast) \
658 SymX(stg_ap_ppp_fast) \
659 SymX(stg_ap_pppv_fast) \
660 SymX(stg_ap_pppp_fast) \
661 SymX(stg_ap_ppppp_fast) \
662 SymX(stg_ap_pppppp_fast) \
663 SymX(stg_ap_1_upd_info) \
664 SymX(stg_ap_2_upd_info) \
665 SymX(stg_ap_3_upd_info) \
666 SymX(stg_ap_4_upd_info) \
667 SymX(stg_ap_5_upd_info) \
668 SymX(stg_ap_6_upd_info) \
669 SymX(stg_ap_7_upd_info) \
671 SymX(stg_sel_0_upd_info) \
672 SymX(stg_sel_10_upd_info) \
673 SymX(stg_sel_11_upd_info) \
674 SymX(stg_sel_12_upd_info) \
675 SymX(stg_sel_13_upd_info) \
676 SymX(stg_sel_14_upd_info) \
677 SymX(stg_sel_15_upd_info) \
678 SymX(stg_sel_1_upd_info) \
679 SymX(stg_sel_2_upd_info) \
680 SymX(stg_sel_3_upd_info) \
681 SymX(stg_sel_4_upd_info) \
682 SymX(stg_sel_5_upd_info) \
683 SymX(stg_sel_6_upd_info) \
684 SymX(stg_sel_7_upd_info) \
685 SymX(stg_sel_8_upd_info) \
686 SymX(stg_sel_9_upd_info) \
687 SymX(stg_upd_frame_info) \
688 SymX(suspendThread) \
689 SymX(takeMVarzh_fast) \
690 SymX(timesIntegerzh_fast) \
691 SymX(tryPutMVarzh_fast) \
692 SymX(tryTakeMVarzh_fast) \
693 SymX(unblockAsyncExceptionszh_fast) \
695 SymX(unsafeThawArrayzh_fast) \
696 SymX(waitReadzh_fast) \
697 SymX(waitWritezh_fast) \
698 SymX(word2Integerzh_fast) \
699 SymX(writeTVarzh_fast) \
700 SymX(xorIntegerzh_fast) \
702 SymX(stg_interp_constr_entry) \
703 SymX(stg_interp_constr1_entry) \
704 SymX(stg_interp_constr2_entry) \
705 SymX(stg_interp_constr3_entry) \
706 SymX(stg_interp_constr4_entry) \
707 SymX(stg_interp_constr5_entry) \
708 SymX(stg_interp_constr6_entry) \
709 SymX(stg_interp_constr7_entry) \
710 SymX(stg_interp_constr8_entry) \
713 SymX(getAllocations) \
716 RTS_USER_SIGNALS_SYMBOLS
718 #ifdef SUPPORT_LONG_LONGS
719 #define RTS_LONG_LONG_SYMS \
720 SymX(int64ToIntegerzh_fast) \
721 SymX(word64ToIntegerzh_fast)
723 #define RTS_LONG_LONG_SYMS /* nothing */
726 // 64-bit support functions in libgcc.a
727 #if defined(__GNUC__) && SIZEOF_VOID_P <= 4
728 #define RTS_LIBGCC_SYMBOLS \
738 #elif defined(ia64_HOST_ARCH)
739 #define RTS_LIBGCC_SYMBOLS \
747 #define RTS_LIBGCC_SYMBOLS
750 #if defined(darwin_HOST_OS) && defined(powerpc_HOST_ARCH)
751 // Symbols that don't have a leading underscore
752 // on Mac OS X. They have to receive special treatment,
753 // see machoInitSymbolsWithoutUnderscore()
754 #define RTS_MACHO_NOUNDERLINE_SYMBOLS \
759 /* entirely bogus claims about types of these symbols */
760 #define Sym(vvv) extern void vvv(void);
761 #define SymX(vvv) /**/
762 #define SymX_redirect(vvv,xxx) /**/
766 RTS_POSIX_ONLY_SYMBOLS
767 RTS_MINGW_ONLY_SYMBOLS
768 RTS_CYGWIN_ONLY_SYMBOLS
769 RTS_DARWIN_ONLY_SYMBOLS
775 #ifdef LEADING_UNDERSCORE
776 #define MAYBE_LEADING_UNDERSCORE_STR(s) ("_" s)
778 #define MAYBE_LEADING_UNDERSCORE_STR(s) (s)
781 #define Sym(vvv) { MAYBE_LEADING_UNDERSCORE_STR(#vvv), \
783 #define SymX(vvv) Sym(vvv)
785 // SymX_redirect allows us to redirect references to one symbol to
786 // another symbol. See newCAF/newDynCAF for an example.
787 #define SymX_redirect(vvv,xxx) \
788 { MAYBE_LEADING_UNDERSCORE_STR(#vvv), \
791 static RtsSymbolVal rtsSyms[] = {
795 RTS_POSIX_ONLY_SYMBOLS
796 RTS_MINGW_ONLY_SYMBOLS
797 RTS_CYGWIN_ONLY_SYMBOLS
799 #if defined(darwin_HOST_OS) && defined(i386_HOST_ARCH)
800 // dyld stub code contains references to this,
801 // but it should never be called because we treat
802 // lazy pointers as nonlazy.
803 { "dyld_stub_binding_helper", (void*)0xDEADBEEF },
805 { 0, 0 } /* sentinel */
809 /* -----------------------------------------------------------------------------
810 * Utilities for handling root pointers.
811 * -------------------------------------------------------------------------- */
814 #define INIT_RPT_SIZE 64
817 initFreeList(rootEntry *table, nat n, rootEntry *free)
821 for (p = table + n - 1; p >= table; p--) {
825 root_ptr_free = table;
829 initRootPtrTable(void)
834 RPT_size = INIT_RPT_SIZE;
835 root_ptr_table = stgMallocBytes(RPT_size * sizeof(rootEntry),
838 initFreeList(root_ptr_table,INIT_RPT_SIZE,NULL);
843 enlargeRootPtrTable(void)
845 nat old_RPT_size = RPT_size;
847 // 2nd and subsequent times
850 stgReallocBytes(root_ptr_table,
851 RPT_size * sizeof(rootEntry),
852 "enlargeRootPtrTable");
854 initFreeList(root_ptr_table + old_RPT_size, old_RPT_size, NULL);
858 addRootObject(void *addr)
862 if (root_ptr_free == NULL) {
863 enlargeRootPtrTable();
866 rt = root_ptr_free - root_ptr_table;
867 root_ptr_free = (rootEntry*)(root_ptr_free->addr);
868 root_ptr_table[rt].addr = addr;
871 /* -----------------------------------------------------------------------------
872 * Treat root pointers as roots for the garbage collector.
873 * -------------------------------------------------------------------------- */
876 markRootPtrTable(evac_fn evac)
878 rootEntry *p, *end_root_ptr_table;
881 end_root_ptr_table = &root_ptr_table[RPT_size];
883 for (p = root_ptr_table; p < end_root_ptr_table; p++) {
886 if (q && (q < (P_)root_ptr_table || q >= (P_)end_root_ptr_table)) {
887 evac((StgClosure **)p->addr);
892 /* -----------------------------------------------------------------------------
893 * End of utilities for handling root pointers.
894 * -------------------------------------------------------------------------- */
897 /* -----------------------------------------------------------------------------
898 * Insert symbols into hash tables, checking for duplicates.
900 static void ghciInsertStrHashTable ( char* obj_name,
906 if (lookupHashTable(table, (StgWord)key) == NULL)
908 insertStrHashTable(table, (StgWord)key, data);
913 "GHCi runtime linker: fatal error: I found a duplicate definition for symbol\n"
915 "whilst processing object file\n"
917 "This could be caused by:\n"
918 " * Loading two different object files which export the same symbol\n"
919 " * Specifying the same object file twice on the GHCi command line\n"
920 " * An incorrect `package.conf' entry, causing some object to be\n"
922 "GHCi cannot safely continue in this situation. Exiting now. Sorry.\n"
931 /* -----------------------------------------------------------------------------
932 * initialize the object linker
936 static int linker_init_done = 0 ;
938 #if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
939 static void *dl_prog_handle;
942 /* dlopen(NULL,..) doesn't work so we grab libc explicitly */
943 #if defined(openbsd_HOST_OS)
944 static void *dl_libc_handle;
952 /* Make initLinker idempotent, so we can call it
953 before evey relevant operation; that means we
954 don't need to initialise the linker separately */
955 if (linker_init_done == 1) { return; } else {
956 linker_init_done = 1;
959 stablehash = allocStrHashTable();
960 symhash = allocStrHashTable();
962 /* populate the symbol table with stuff from the RTS */
963 for (sym = rtsSyms; sym->lbl != NULL; sym++) {
964 ghciInsertStrHashTable("(GHCi built-in symbols)",
965 symhash, sym->lbl, sym->addr);
967 # if defined(OBJFORMAT_MACHO) && defined(powerpc_HOST_ARCH)
968 machoInitSymbolsWithoutUnderscore();
971 # if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
972 # if defined(RTLD_DEFAULT)
973 dl_prog_handle = RTLD_DEFAULT;
975 dl_prog_handle = dlopen(NULL, RTLD_LAZY);
976 # if defined(openbsd_HOST_OS)
977 dl_libc_handle = dlopen("libc.so", RTLD_LAZY);
979 # endif /* RTLD_DEFAULT */
983 /* -----------------------------------------------------------------------------
984 * Loading DLL or .so dynamic libraries
985 * -----------------------------------------------------------------------------
987 * Add a DLL from which symbols may be found. In the ELF case, just
988 * do RTLD_GLOBAL-style add, so no further messing around needs to
989 * happen in order that symbols in the loaded .so are findable --
990 * lookupSymbol() will subsequently see them by dlsym on the program's
991 * dl-handle. Returns NULL if success, otherwise ptr to an err msg.
993 * In the PEi386 case, open the DLLs and put handles to them in a
994 * linked list. When looking for a symbol, try all handles in the
995 * list. This means that we need to load even DLLs that are guaranteed
996 * to be in the ghc.exe image already, just so we can get a handle
997 * to give to loadSymbol, so that we can find the symbols. For such
998 * libraries, the LoadLibrary call should be a no-op except for returning
1003 #if defined(OBJFORMAT_PEi386)
1004 /* A record for storing handles into DLLs. */
1009 struct _OpenedDLL* next;
1014 /* A list thereof. */
1015 static OpenedDLL* opened_dlls = NULL;
1019 addDLL( char *dll_name )
1021 # if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
1022 /* ------------------- ELF DLL loader ------------------- */
1028 hdl= dlopen(dll_name, RTLD_NOW | RTLD_GLOBAL);
1031 /* dlopen failed; return a ptr to the error msg. */
1033 if (errmsg == NULL) errmsg = "addDLL: unknown error";
1040 # elif defined(OBJFORMAT_PEi386)
1041 /* ------------------- Win32 DLL loader ------------------- */
1049 /* debugBelch("\naddDLL; dll_name = `%s'\n", dll_name); */
1051 /* See if we've already got it, and ignore if so. */
1052 for (o_dll = opened_dlls; o_dll != NULL; o_dll = o_dll->next) {
1053 if (0 == strcmp(o_dll->name, dll_name))
1057 /* The file name has no suffix (yet) so that we can try
1058 both foo.dll and foo.drv
1060 The documentation for LoadLibrary says:
1061 If no file name extension is specified in the lpFileName
1062 parameter, the default library extension .dll is
1063 appended. However, the file name string can include a trailing
1064 point character (.) to indicate that the module name has no
1067 buf = stgMallocBytes(strlen(dll_name) + 10, "addDLL");
1068 sprintf(buf, "%s.DLL", dll_name);
1069 instance = LoadLibrary(buf);
1070 if (instance == NULL) {
1071 sprintf(buf, "%s.DRV", dll_name); // KAA: allow loading of drivers (like winspool.drv)
1072 instance = LoadLibrary(buf);
1073 if (instance == NULL) {
1076 /* LoadLibrary failed; return a ptr to the error msg. */
1077 return "addDLL: unknown error";
1082 /* Add this DLL to the list of DLLs in which to search for symbols. */
1083 o_dll = stgMallocBytes( sizeof(OpenedDLL), "addDLL" );
1084 o_dll->name = stgMallocBytes(1+strlen(dll_name), "addDLL");
1085 strcpy(o_dll->name, dll_name);
1086 o_dll->instance = instance;
1087 o_dll->next = opened_dlls;
1088 opened_dlls = o_dll;
1092 barf("addDLL: not implemented on this platform");
1096 /* -----------------------------------------------------------------------------
1097 * insert a stable symbol in the hash table
1101 insertStableSymbol(char* obj_name, char* key, StgPtr p)
1103 ghciInsertStrHashTable(obj_name, stablehash, key, getStablePtr(p));
1107 /* -----------------------------------------------------------------------------
1108 * insert a symbol in the hash table
1111 insertSymbol(char* obj_name, char* key, void* data)
1113 ghciInsertStrHashTable(obj_name, symhash, key, data);
1116 /* -----------------------------------------------------------------------------
1117 * lookup a symbol in the hash table
1120 lookupSymbol( char *lbl )
1124 ASSERT(symhash != NULL);
1125 val = lookupStrHashTable(symhash, lbl);
1128 # if defined(OBJFORMAT_ELF)
1129 # if defined(openbsd_HOST_OS)
1130 val = dlsym(dl_prog_handle, lbl);
1131 return (val != NULL) ? val : dlsym(dl_libc_handle,lbl);
1132 # elif defined(x86_64_HOST_ARCH)
1133 val = dlsym(dl_prog_handle, lbl);
1134 if (val >= (void *)0x80000000) {
1136 new_val = x86_64_high_symbol(lbl, val);
1137 IF_DEBUG(linker,debugBelch("lookupSymbol: relocating out of range symbol: %s = %p, now %p\n", lbl, val, new_val));
1142 # else /* not openbsd */
1143 return dlsym(dl_prog_handle, lbl);
1145 # elif defined(OBJFORMAT_MACHO)
1146 if(NSIsSymbolNameDefined(lbl)) {
1147 NSSymbol symbol = NSLookupAndBindSymbol(lbl);
1148 return NSAddressOfSymbol(symbol);
1152 # elif defined(OBJFORMAT_PEi386)
1155 for (o_dll = opened_dlls; o_dll != NULL; o_dll = o_dll->next) {
1156 /* debugBelch("look in %s for %s\n", o_dll->name, lbl); */
1157 if (lbl[0] == '_') {
1158 /* HACK: if the name has an initial underscore, try stripping
1159 it off & look that up first. I've yet to verify whether there's
1160 a Rule that governs whether an initial '_' *should always* be
1161 stripped off when mapping from import lib name to the DLL name.
1163 sym = GetProcAddress(o_dll->instance, (lbl+1));
1165 /*debugBelch("found %s in %s\n", lbl+1,o_dll->name);*/
1169 sym = GetProcAddress(o_dll->instance, lbl);
1171 /*debugBelch("found %s in %s\n", lbl,o_dll->name);*/
1186 __attribute((unused))
1188 lookupLocalSymbol( ObjectCode* oc, char *lbl )
1192 val = lookupStrHashTable(oc->lochash, lbl);
1202 /* -----------------------------------------------------------------------------
1203 * Debugging aid: look in GHCi's object symbol tables for symbols
1204 * within DELTA bytes of the specified address, and show their names.
1207 void ghci_enquire ( char* addr );
1209 void ghci_enquire ( char* addr )
1214 const int DELTA = 64;
1219 for (oc = objects; oc; oc = oc->next) {
1220 for (i = 0; i < oc->n_symbols; i++) {
1221 sym = oc->symbols[i];
1222 if (sym == NULL) continue;
1223 // debugBelch("enquire %p %p\n", sym, oc->lochash);
1225 if (oc->lochash != NULL) {
1226 a = lookupStrHashTable(oc->lochash, sym);
1229 a = lookupStrHashTable(symhash, sym);
1232 // debugBelch("ghci_enquire: can't find %s\n", sym);
1234 else if (addr-DELTA <= a && a <= addr+DELTA) {
1235 debugBelch("%p + %3d == `%s'\n", addr, (int)(a - addr), sym);
1242 #ifdef ia64_HOST_ARCH
1243 static unsigned int PLTSize(void);
1246 /* -----------------------------------------------------------------------------
1247 * Load an obj (populate the global symbol table, but don't resolve yet)
1249 * Returns: 1 if ok, 0 on error.
1252 loadObj( char *path )
1259 void *map_addr = NULL;
1266 /* debugBelch("loadObj %s\n", path ); */
1268 /* Check that we haven't already loaded this object.
1269 Ignore requests to load multiple times */
1273 for (o = objects; o; o = o->next) {
1274 if (0 == strcmp(o->fileName, path)) {
1276 break; /* don't need to search further */
1280 IF_DEBUG(linker, debugBelch(
1281 "GHCi runtime linker: warning: looks like you're trying to load the\n"
1282 "same object file twice:\n"
1284 "GHCi will ignore this, but be warned.\n"
1286 return 1; /* success */
1290 oc = stgMallocBytes(sizeof(ObjectCode), "loadObj(oc)");
1292 # if defined(OBJFORMAT_ELF)
1293 oc->formatName = "ELF";
1294 # elif defined(OBJFORMAT_PEi386)
1295 oc->formatName = "PEi386";
1296 # elif defined(OBJFORMAT_MACHO)
1297 oc->formatName = "Mach-O";
1300 barf("loadObj: not implemented on this platform");
1303 r = stat(path, &st);
1304 if (r == -1) { return 0; }
1306 /* sigh, strdup() isn't a POSIX function, so do it the long way */
1307 oc->fileName = stgMallocBytes( strlen(path)+1, "loadObj" );
1308 strcpy(oc->fileName, path);
1310 oc->fileSize = st.st_size;
1312 oc->sections = NULL;
1313 oc->lochash = allocStrHashTable();
1314 oc->proddables = NULL;
1316 /* chain it onto the list of objects */
1321 #define ROUND_UP(x,size) ((x + size - 1) & ~(size - 1))
1323 /* On many architectures malloc'd memory isn't executable, so we need to use mmap. */
1325 #if defined(openbsd_HOST_OS)
1326 fd = open(path, O_RDONLY, S_IRUSR);
1328 fd = open(path, O_RDONLY);
1331 barf("loadObj: can't open `%s'", path);
1333 pagesize = getpagesize();
1335 #ifdef ia64_HOST_ARCH
1336 /* The PLT needs to be right before the object */
1337 n = ROUND_UP(PLTSize(), pagesize);
1338 oc->plt = mmap(NULL, n, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
1339 if (oc->plt == MAP_FAILED)
1340 barf("loadObj: can't allocate PLT");
1343 map_addr = oc->plt + n;
1346 n = ROUND_UP(oc->fileSize, pagesize);
1348 /* Link objects into the lower 2Gb on x86_64. GHC assumes the
1349 * small memory model on this architecture (see gcc docs,
1352 #ifdef x86_64_HOST_ARCH
1353 #define EXTRA_MAP_FLAGS MAP_32BIT
1355 #define EXTRA_MAP_FLAGS 0
1358 oc->image = mmap(map_addr, n, PROT_EXEC|PROT_READ|PROT_WRITE,
1359 MAP_PRIVATE|EXTRA_MAP_FLAGS, fd, 0);
1360 if (oc->image == MAP_FAILED)
1361 barf("loadObj: can't map `%s'", path);
1365 #else /* !USE_MMAP */
1367 /* load the image into memory */
1368 f = fopen(path, "rb");
1370 barf("loadObj: can't read `%s'", path);
1372 #ifdef darwin_HOST_OS
1373 // In a Mach-O .o file, all sections can and will be misaligned
1374 // if the total size of the headers is not a multiple of the
1375 // desired alignment. This is fine for .o files that only serve
1376 // as input for the static linker, but it's not fine for us,
1377 // as SSE (used by gcc for floating point) and Altivec require
1378 // 16-byte alignment.
1379 // We calculate the correct alignment from the header before
1380 // reading the file, and then we misalign oc->image on purpose so
1381 // that the actual sections end up aligned again.
1382 misalignment = machoGetMisalignment(f);
1383 oc->misalignment = misalignment;
1388 oc->image = stgMallocBytes(oc->fileSize + misalignment, "loadObj(image)");
1389 oc->image += misalignment;
1391 n = fread ( oc->image, 1, oc->fileSize, f );
1392 if (n != oc->fileSize)
1393 barf("loadObj: error whilst reading `%s'", path);
1397 #endif /* USE_MMAP */
1399 # if defined(OBJFORMAT_MACHO) && defined(powerpc_HOST_ARCH)
1400 r = ocAllocateJumpIslands_MachO ( oc );
1401 if (!r) { return r; }
1402 # elif defined(OBJFORMAT_ELF) && defined(powerpc_HOST_ARCH)
1403 r = ocAllocateJumpIslands_ELF ( oc );
1404 if (!r) { return r; }
1407 /* verify the in-memory image */
1408 # if defined(OBJFORMAT_ELF)
1409 r = ocVerifyImage_ELF ( oc );
1410 # elif defined(OBJFORMAT_PEi386)
1411 r = ocVerifyImage_PEi386 ( oc );
1412 # elif defined(OBJFORMAT_MACHO)
1413 r = ocVerifyImage_MachO ( oc );
1415 barf("loadObj: no verify method");
1417 if (!r) { return r; }
1419 /* build the symbol list for this image */
1420 # if defined(OBJFORMAT_ELF)
1421 r = ocGetNames_ELF ( oc );
1422 # elif defined(OBJFORMAT_PEi386)
1423 r = ocGetNames_PEi386 ( oc );
1424 # elif defined(OBJFORMAT_MACHO)
1425 r = ocGetNames_MachO ( oc );
1427 barf("loadObj: no getNames method");
1429 if (!r) { return r; }
1431 /* loaded, but not resolved yet */
1432 oc->status = OBJECT_LOADED;
1437 /* -----------------------------------------------------------------------------
1438 * resolve all the currently unlinked objects in memory
1440 * Returns: 1 if ok, 0 on error.
1450 for (oc = objects; oc; oc = oc->next) {
1451 if (oc->status != OBJECT_RESOLVED) {
1452 # if defined(OBJFORMAT_ELF)
1453 r = ocResolve_ELF ( oc );
1454 # elif defined(OBJFORMAT_PEi386)
1455 r = ocResolve_PEi386 ( oc );
1456 # elif defined(OBJFORMAT_MACHO)
1457 r = ocResolve_MachO ( oc );
1459 barf("resolveObjs: not implemented on this platform");
1461 if (!r) { return r; }
1462 oc->status = OBJECT_RESOLVED;
1468 /* -----------------------------------------------------------------------------
1469 * delete an object from the pool
1472 unloadObj( char *path )
1474 ObjectCode *oc, *prev;
1476 ASSERT(symhash != NULL);
1477 ASSERT(objects != NULL);
1482 for (oc = objects; oc; prev = oc, oc = oc->next) {
1483 if (!strcmp(oc->fileName,path)) {
1485 /* Remove all the mappings for the symbols within this
1490 for (i = 0; i < oc->n_symbols; i++) {
1491 if (oc->symbols[i] != NULL) {
1492 removeStrHashTable(symhash, oc->symbols[i], NULL);
1500 prev->next = oc->next;
1503 /* We're going to leave this in place, in case there are
1504 any pointers from the heap into it: */
1505 /* stgFree(oc->image); */
1506 stgFree(oc->fileName);
1507 stgFree(oc->symbols);
1508 stgFree(oc->sections);
1509 /* The local hash table should have been freed at the end
1510 of the ocResolve_ call on it. */
1511 ASSERT(oc->lochash == NULL);
1517 errorBelch("unloadObj: can't find `%s' to unload", path);
1521 /* -----------------------------------------------------------------------------
1522 * Sanity checking. For each ObjectCode, maintain a list of address ranges
1523 * which may be prodded during relocation, and abort if we try and write
1524 * outside any of these.
1526 static void addProddableBlock ( ObjectCode* oc, void* start, int size )
1529 = stgMallocBytes(sizeof(ProddableBlock), "addProddableBlock");
1530 /* debugBelch("aPB %p %p %d\n", oc, start, size); */
1534 pb->next = oc->proddables;
1535 oc->proddables = pb;
1538 static void checkProddableBlock ( ObjectCode* oc, void* addr )
1541 for (pb = oc->proddables; pb != NULL; pb = pb->next) {
1542 char* s = (char*)(pb->start);
1543 char* e = s + pb->size - 1;
1544 char* a = (char*)addr;
1545 /* Assumes that the biggest fixup involves a 4-byte write. This
1546 probably needs to be changed to 8 (ie, +7) on 64-bit
1548 if (a >= s && (a+3) <= e) return;
1550 barf("checkProddableBlock: invalid fixup in runtime linker");
1553 /* -----------------------------------------------------------------------------
1554 * Section management.
1556 static void addSection ( ObjectCode* oc, SectionKind kind,
1557 void* start, void* end )
1559 Section* s = stgMallocBytes(sizeof(Section), "addSection");
1563 s->next = oc->sections;
1566 debugBelch("addSection: %p-%p (size %d), kind %d\n",
1567 start, ((char*)end)-1, end - start + 1, kind );
1572 /* --------------------------------------------------------------------------
1573 * PowerPC specifics (jump islands)
1574 * ------------------------------------------------------------------------*/
1576 #if defined(powerpc_HOST_ARCH)
1579 ocAllocateJumpIslands
1581 Allocate additional space at the end of the object file image to make room
1584 PowerPC relative branch instructions have a 24 bit displacement field.
1585 As PPC code is always 4-byte-aligned, this yields a +-32MB range.
1586 If a particular imported symbol is outside this range, we have to redirect
1587 the jump to a short piece of new code that just loads the 32bit absolute
1588 address and jumps there.
1589 This function just allocates space for one 16 byte ppcJumpIsland for every
1590 undefined symbol in the object file. The code for the islands is filled in by
1591 makeJumpIsland below.
1594 static int ocAllocateJumpIslands( ObjectCode* oc, int count, int first )
1600 int misalignment = 0;
1602 misalignment = oc->misalignment;
1607 // round up to the nearest 4
1608 aligned = (oc->fileSize + 3) & ~3;
1611 #ifndef linux_HOST_OS /* mremap is a linux extension */
1612 #error ocAllocateJumpIslands doesnt want USE_MMAP to be defined
1615 pagesize = getpagesize();
1616 n = ROUND_UP( oc->fileSize, pagesize );
1617 m = ROUND_UP( aligned + sizeof (ppcJumpIsland) * count, pagesize );
1619 /* If we have a half-page-size file and map one page of it then
1620 * the part of the page after the size of the file remains accessible.
1621 * If, however, we map in 2 pages, the 2nd page is not accessible
1622 * and will give a "Bus Error" on access. To get around this, we check
1623 * if we need any extra pages for the jump islands and map them in
1624 * anonymously. We must check that we actually require extra pages
1625 * otherwise the attempt to mmap 0 pages of anonymous memory will
1631 /* The effect of this mremap() call is only the ensure that we have
1632 * a sufficient number of virtually contiguous pages. As returned from
1633 * mremap, the pages past the end of the file are not backed. We give
1634 * them a backing by using MAP_FIXED to map in anonymous pages.
1636 oc->image = mremap( oc->image, n, m, MREMAP_MAYMOVE );
1638 if( oc->image == MAP_FAILED )
1640 errorBelch( "Unable to mremap for Jump Islands\n" );
1644 if( mmap( oc->image + n, m - n, PROT_READ | PROT_WRITE | PROT_EXEC,
1645 MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED, 0, 0 ) == MAP_FAILED )
1647 errorBelch( "Unable to mmap( MAP_FIXED ) for Jump Islands\n" );
1653 oc->image -= misalignment;
1654 oc->image = stgReallocBytes( oc->image,
1656 aligned + sizeof (ppcJumpIsland) * count,
1657 "ocAllocateJumpIslands" );
1658 oc->image += misalignment;
1659 #endif /* USE_MMAP */
1661 oc->jump_islands = (ppcJumpIsland *) (oc->image + aligned);
1662 memset( oc->jump_islands, 0, sizeof (ppcJumpIsland) * count );
1665 oc->jump_islands = NULL;
1667 oc->island_start_symbol = first;
1668 oc->n_islands = count;
1673 static unsigned long makeJumpIsland( ObjectCode* oc,
1674 unsigned long symbolNumber,
1675 unsigned long target )
1677 ppcJumpIsland *island;
1679 if( symbolNumber < oc->island_start_symbol ||
1680 symbolNumber - oc->island_start_symbol > oc->n_islands)
1683 island = &oc->jump_islands[symbolNumber - oc->island_start_symbol];
1685 // lis r12, hi16(target)
1686 island->lis_r12 = 0x3d80;
1687 island->hi_addr = target >> 16;
1689 // ori r12, r12, lo16(target)
1690 island->ori_r12_r12 = 0x618c;
1691 island->lo_addr = target & 0xffff;
1694 island->mtctr_r12 = 0x7d8903a6;
1697 island->bctr = 0x4e800420;
1699 return (unsigned long) island;
1703 ocFlushInstructionCache
1705 Flush the data & instruction caches.
1706 Because the PPC has split data/instruction caches, we have to
1707 do that whenever we modify code at runtime.
1710 static void ocFlushInstructionCache( ObjectCode *oc )
1712 int n = (oc->fileSize + sizeof( ppcJumpIsland ) * oc->n_islands + 3) / 4;
1713 unsigned long *p = (unsigned long *) oc->image;
1717 __asm__ volatile ( "dcbf 0,%0\n\t"
1725 __asm__ volatile ( "sync\n\t"
1731 /* --------------------------------------------------------------------------
1732 * PEi386 specifics (Win32 targets)
1733 * ------------------------------------------------------------------------*/
1735 /* The information for this linker comes from
1736 Microsoft Portable Executable
1737 and Common Object File Format Specification
1738 revision 5.1 January 1998
1739 which SimonM says comes from the MS Developer Network CDs.
1741 It can be found there (on older CDs), but can also be found
1744 http://www.microsoft.com/hwdev/hardware/PECOFF.asp
1746 (this is Rev 6.0 from February 1999).
1748 Things move, so if that fails, try searching for it via
1750 http://www.google.com/search?q=PE+COFF+specification
1752 The ultimate reference for the PE format is the Winnt.h
1753 header file that comes with the Platform SDKs; as always,
1754 implementations will drift wrt their documentation.
1756 A good background article on the PE format is Matt Pietrek's
1757 March 1994 article in Microsoft System Journal (MSJ)
1758 (Vol.9, No. 3): "Peering Inside the PE: A Tour of the
1759 Win32 Portable Executable File Format." The info in there
1760 has recently been updated in a two part article in
1761 MSDN magazine, issues Feb and March 2002,
1762 "Inside Windows: An In-Depth Look into the Win32 Portable
1763 Executable File Format"
1765 John Levine's book "Linkers and Loaders" contains useful
1770 #if defined(OBJFORMAT_PEi386)
1774 typedef unsigned char UChar;
1775 typedef unsigned short UInt16;
1776 typedef unsigned int UInt32;
1783 UInt16 NumberOfSections;
1784 UInt32 TimeDateStamp;
1785 UInt32 PointerToSymbolTable;
1786 UInt32 NumberOfSymbols;
1787 UInt16 SizeOfOptionalHeader;
1788 UInt16 Characteristics;
1792 #define sizeof_COFF_header 20
1799 UInt32 VirtualAddress;
1800 UInt32 SizeOfRawData;
1801 UInt32 PointerToRawData;
1802 UInt32 PointerToRelocations;
1803 UInt32 PointerToLinenumbers;
1804 UInt16 NumberOfRelocations;
1805 UInt16 NumberOfLineNumbers;
1806 UInt32 Characteristics;
1810 #define sizeof_COFF_section 40
1817 UInt16 SectionNumber;
1820 UChar NumberOfAuxSymbols;
1824 #define sizeof_COFF_symbol 18
1829 UInt32 VirtualAddress;
1830 UInt32 SymbolTableIndex;
1835 #define sizeof_COFF_reloc 10
1838 /* From PE spec doc, section 3.3.2 */
1839 /* Note use of MYIMAGE_* since IMAGE_* are already defined in
1840 windows.h -- for the same purpose, but I want to know what I'm
1842 #define MYIMAGE_FILE_RELOCS_STRIPPED 0x0001
1843 #define MYIMAGE_FILE_EXECUTABLE_IMAGE 0x0002
1844 #define MYIMAGE_FILE_DLL 0x2000
1845 #define MYIMAGE_FILE_SYSTEM 0x1000
1846 #define MYIMAGE_FILE_BYTES_REVERSED_HI 0x8000
1847 #define MYIMAGE_FILE_BYTES_REVERSED_LO 0x0080
1848 #define MYIMAGE_FILE_32BIT_MACHINE 0x0100
1850 /* From PE spec doc, section 5.4.2 and 5.4.4 */
1851 #define MYIMAGE_SYM_CLASS_EXTERNAL 2
1852 #define MYIMAGE_SYM_CLASS_STATIC 3
1853 #define MYIMAGE_SYM_UNDEFINED 0
1855 /* From PE spec doc, section 4.1 */
1856 #define MYIMAGE_SCN_CNT_CODE 0x00000020
1857 #define MYIMAGE_SCN_CNT_INITIALIZED_DATA 0x00000040
1858 #define MYIMAGE_SCN_LNK_NRELOC_OVFL 0x01000000
1860 /* From PE spec doc, section 5.2.1 */
1861 #define MYIMAGE_REL_I386_DIR32 0x0006
1862 #define MYIMAGE_REL_I386_REL32 0x0014
1865 /* We use myindex to calculate array addresses, rather than
1866 simply doing the normal subscript thing. That's because
1867 some of the above structs have sizes which are not
1868 a whole number of words. GCC rounds their sizes up to a
1869 whole number of words, which means that the address calcs
1870 arising from using normal C indexing or pointer arithmetic
1871 are just plain wrong. Sigh.
1874 myindex ( int scale, void* base, int index )
1877 ((UChar*)base) + scale * index;
1882 printName ( UChar* name, UChar* strtab )
1884 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
1885 UInt32 strtab_offset = * (UInt32*)(name+4);
1886 debugBelch("%s", strtab + strtab_offset );
1889 for (i = 0; i < 8; i++) {
1890 if (name[i] == 0) break;
1891 debugBelch("%c", name[i] );
1898 copyName ( UChar* name, UChar* strtab, UChar* dst, int dstSize )
1900 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
1901 UInt32 strtab_offset = * (UInt32*)(name+4);
1902 strncpy ( dst, strtab+strtab_offset, dstSize );
1908 if (name[i] == 0) break;
1918 cstring_from_COFF_symbol_name ( UChar* name, UChar* strtab )
1921 /* If the string is longer than 8 bytes, look in the
1922 string table for it -- this will be correctly zero terminated.
1924 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
1925 UInt32 strtab_offset = * (UInt32*)(name+4);
1926 return ((UChar*)strtab) + strtab_offset;
1928 /* Otherwise, if shorter than 8 bytes, return the original,
1929 which by defn is correctly terminated.
1931 if (name[7]==0) return name;
1932 /* The annoying case: 8 bytes. Copy into a temporary
1933 (which is never freed ...)
1935 newstr = stgMallocBytes(9, "cstring_from_COFF_symbol_name");
1937 strncpy(newstr,name,8);
1943 /* Just compares the short names (first 8 chars) */
1944 static COFF_section *
1945 findPEi386SectionCalled ( ObjectCode* oc, char* name )
1949 = (COFF_header*)(oc->image);
1950 COFF_section* sectab
1952 ((UChar*)(oc->image))
1953 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
1955 for (i = 0; i < hdr->NumberOfSections; i++) {
1958 COFF_section* section_i
1960 myindex ( sizeof_COFF_section, sectab, i );
1961 n1 = (UChar*) &(section_i->Name);
1963 if (n1[0]==n2[0] && n1[1]==n2[1] && n1[2]==n2[2] &&
1964 n1[3]==n2[3] && n1[4]==n2[4] && n1[5]==n2[5] &&
1965 n1[6]==n2[6] && n1[7]==n2[7])
1974 zapTrailingAtSign ( UChar* sym )
1976 # define my_isdigit(c) ((c) >= '0' && (c) <= '9')
1978 if (sym[0] == 0) return;
1980 while (sym[i] != 0) i++;
1983 while (j > 0 && my_isdigit(sym[j])) j--;
1984 if (j > 0 && sym[j] == '@' && j != i) sym[j] = 0;
1990 ocVerifyImage_PEi386 ( ObjectCode* oc )
1995 COFF_section* sectab;
1996 COFF_symbol* symtab;
1998 /* debugBelch("\nLOADING %s\n", oc->fileName); */
1999 hdr = (COFF_header*)(oc->image);
2000 sectab = (COFF_section*) (
2001 ((UChar*)(oc->image))
2002 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2004 symtab = (COFF_symbol*) (
2005 ((UChar*)(oc->image))
2006 + hdr->PointerToSymbolTable
2008 strtab = ((UChar*)symtab)
2009 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
2011 if (hdr->Machine != 0x14c) {
2012 errorBelch("%s: Not x86 PEi386", oc->fileName);
2015 if (hdr->SizeOfOptionalHeader != 0) {
2016 errorBelch("%s: PEi386 with nonempty optional header", oc->fileName);
2019 if ( /* (hdr->Characteristics & MYIMAGE_FILE_RELOCS_STRIPPED) || */
2020 (hdr->Characteristics & MYIMAGE_FILE_EXECUTABLE_IMAGE) ||
2021 (hdr->Characteristics & MYIMAGE_FILE_DLL) ||
2022 (hdr->Characteristics & MYIMAGE_FILE_SYSTEM) ) {
2023 errorBelch("%s: Not a PEi386 object file", oc->fileName);
2026 if ( (hdr->Characteristics & MYIMAGE_FILE_BYTES_REVERSED_HI)
2027 /* || !(hdr->Characteristics & MYIMAGE_FILE_32BIT_MACHINE) */ ) {
2028 errorBelch("%s: Invalid PEi386 word size or endiannness: %d",
2030 (int)(hdr->Characteristics));
2033 /* If the string table size is way crazy, this might indicate that
2034 there are more than 64k relocations, despite claims to the
2035 contrary. Hence this test. */
2036 /* debugBelch("strtab size %d\n", * (UInt32*)strtab); */
2038 if ( (*(UInt32*)strtab) > 600000 ) {
2039 /* Note that 600k has no special significance other than being
2040 big enough to handle the almost-2MB-sized lumps that
2041 constitute HSwin32*.o. */
2042 debugBelch("PEi386 object has suspiciously large string table; > 64k relocs?");
2047 /* No further verification after this point; only debug printing. */
2049 IF_DEBUG(linker, i=1);
2050 if (i == 0) return 1;
2052 debugBelch( "sectab offset = %d\n", ((UChar*)sectab) - ((UChar*)hdr) );
2053 debugBelch( "symtab offset = %d\n", ((UChar*)symtab) - ((UChar*)hdr) );
2054 debugBelch( "strtab offset = %d\n", ((UChar*)strtab) - ((UChar*)hdr) );
2057 debugBelch( "Machine: 0x%x\n", (UInt32)(hdr->Machine) );
2058 debugBelch( "# sections: %d\n", (UInt32)(hdr->NumberOfSections) );
2059 debugBelch( "time/date: 0x%x\n", (UInt32)(hdr->TimeDateStamp) );
2060 debugBelch( "symtab offset: %d\n", (UInt32)(hdr->PointerToSymbolTable) );
2061 debugBelch( "# symbols: %d\n", (UInt32)(hdr->NumberOfSymbols) );
2062 debugBelch( "sz of opt hdr: %d\n", (UInt32)(hdr->SizeOfOptionalHeader) );
2063 debugBelch( "characteristics: 0x%x\n", (UInt32)(hdr->Characteristics) );
2065 /* Print the section table. */
2067 for (i = 0; i < hdr->NumberOfSections; i++) {
2069 COFF_section* sectab_i
2071 myindex ( sizeof_COFF_section, sectab, i );
2078 printName ( sectab_i->Name, strtab );
2088 sectab_i->VirtualSize,
2089 sectab_i->VirtualAddress,
2090 sectab_i->SizeOfRawData,
2091 sectab_i->PointerToRawData,
2092 sectab_i->NumberOfRelocations,
2093 sectab_i->PointerToRelocations,
2094 sectab_i->PointerToRawData
2096 reltab = (COFF_reloc*) (
2097 ((UChar*)(oc->image)) + sectab_i->PointerToRelocations
2100 if ( sectab_i->Characteristics & MYIMAGE_SCN_LNK_NRELOC_OVFL ) {
2101 /* If the relocation field (a short) has overflowed, the
2102 * real count can be found in the first reloc entry.
2104 * See Section 4.1 (last para) of the PE spec (rev6.0).
2106 COFF_reloc* rel = (COFF_reloc*)
2107 myindex ( sizeof_COFF_reloc, reltab, 0 );
2108 noRelocs = rel->VirtualAddress;
2111 noRelocs = sectab_i->NumberOfRelocations;
2115 for (; j < noRelocs; j++) {
2117 COFF_reloc* rel = (COFF_reloc*)
2118 myindex ( sizeof_COFF_reloc, reltab, j );
2120 " type 0x%-4x vaddr 0x%-8x name `",
2122 rel->VirtualAddress );
2123 sym = (COFF_symbol*)
2124 myindex ( sizeof_COFF_symbol, symtab, rel->SymbolTableIndex );
2125 /* Hmm..mysterious looking offset - what's it for? SOF */
2126 printName ( sym->Name, strtab -10 );
2133 debugBelch("string table has size 0x%x\n", * (UInt32*)strtab );
2134 debugBelch("---START of string table---\n");
2135 for (i = 4; i < *(Int32*)strtab; i++) {
2137 debugBelch("\n"); else
2138 debugBelch("%c", strtab[i] );
2140 debugBelch("--- END of string table---\n");
2145 COFF_symbol* symtab_i;
2146 if (i >= (Int32)(hdr->NumberOfSymbols)) break;
2147 symtab_i = (COFF_symbol*)
2148 myindex ( sizeof_COFF_symbol, symtab, i );
2154 printName ( symtab_i->Name, strtab );
2163 (Int32)(symtab_i->SectionNumber),
2164 (UInt32)symtab_i->Type,
2165 (UInt32)symtab_i->StorageClass,
2166 (UInt32)symtab_i->NumberOfAuxSymbols
2168 i += symtab_i->NumberOfAuxSymbols;
2178 ocGetNames_PEi386 ( ObjectCode* oc )
2181 COFF_section* sectab;
2182 COFF_symbol* symtab;
2189 hdr = (COFF_header*)(oc->image);
2190 sectab = (COFF_section*) (
2191 ((UChar*)(oc->image))
2192 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2194 symtab = (COFF_symbol*) (
2195 ((UChar*)(oc->image))
2196 + hdr->PointerToSymbolTable
2198 strtab = ((UChar*)(oc->image))
2199 + hdr->PointerToSymbolTable
2200 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
2202 /* Allocate space for any (local, anonymous) .bss sections. */
2204 for (i = 0; i < hdr->NumberOfSections; i++) {
2207 COFF_section* sectab_i
2209 myindex ( sizeof_COFF_section, sectab, i );
2210 if (0 != strcmp(sectab_i->Name, ".bss")) continue;
2211 /* sof 10/05: the PE spec text isn't too clear regarding what
2212 * the SizeOfRawData field is supposed to hold for object
2213 * file sections containing just uninitialized data -- for executables,
2214 * it is supposed to be zero; unclear what it's supposed to be
2215 * for object files. However, VirtualSize is guaranteed to be
2216 * zero for object files, which definitely suggests that SizeOfRawData
2217 * will be non-zero (where else would the size of this .bss section be
2218 * stored?) Looking at the COFF_section info for incoming object files,
2219 * this certainly appears to be the case.
2221 * => I suspect we've been incorrectly handling .bss sections in (relocatable)
2222 * object files up until now. This turned out to bite us with ghc-6.4.1's use
2223 * of gcc-3.4.x, which has started to emit initially-zeroed-out local 'static'
2224 * variable decls into to the .bss section. (The specific function in Q which
2225 * triggered this is libraries/base/cbits/dirUtils.c:__hscore_getFolderPath())
2227 if (sectab_i->VirtualSize == 0 && sectab_i->SizeOfRawData == 0) continue;
2228 /* This is a non-empty .bss section. Allocate zeroed space for
2229 it, and set its PointerToRawData field such that oc->image +
2230 PointerToRawData == addr_of_zeroed_space. */
2231 bss_sz = sectab_i->VirtualSize;
2232 if ( bss_sz < sectab_i->SizeOfRawData) { bss_sz = sectab_i->SizeOfRawData; }
2233 zspace = stgCallocBytes(1, bss_sz, "ocGetNames_PEi386(anonymous bss)");
2234 sectab_i->PointerToRawData = ((UChar*)zspace) - ((UChar*)(oc->image));
2235 addProddableBlock(oc, zspace, bss_sz);
2236 /* debugBelch("BSS anon section at 0x%x\n", zspace); */
2239 /* Copy section information into the ObjectCode. */
2241 for (i = 0; i < hdr->NumberOfSections; i++) {
2247 = SECTIONKIND_OTHER;
2248 COFF_section* sectab_i
2250 myindex ( sizeof_COFF_section, sectab, i );
2251 IF_DEBUG(linker, debugBelch("section name = %s\n", sectab_i->Name ));
2254 /* I'm sure this is the Right Way to do it. However, the
2255 alternative of testing the sectab_i->Name field seems to
2256 work ok with Cygwin.
2258 if (sectab_i->Characteristics & MYIMAGE_SCN_CNT_CODE ||
2259 sectab_i->Characteristics & MYIMAGE_SCN_CNT_INITIALIZED_DATA)
2260 kind = SECTIONKIND_CODE_OR_RODATA;
2263 if (0==strcmp(".text",sectab_i->Name) ||
2264 0==strcmp(".rdata",sectab_i->Name)||
2265 0==strcmp(".rodata",sectab_i->Name))
2266 kind = SECTIONKIND_CODE_OR_RODATA;
2267 if (0==strcmp(".data",sectab_i->Name) ||
2268 0==strcmp(".bss",sectab_i->Name))
2269 kind = SECTIONKIND_RWDATA;
2271 ASSERT(sectab_i->SizeOfRawData == 0 || sectab_i->VirtualSize == 0);
2272 sz = sectab_i->SizeOfRawData;
2273 if (sz < sectab_i->VirtualSize) sz = sectab_i->VirtualSize;
2275 start = ((UChar*)(oc->image)) + sectab_i->PointerToRawData;
2276 end = start + sz - 1;
2278 if (kind == SECTIONKIND_OTHER
2279 /* Ignore sections called which contain stabs debugging
2281 && 0 != strcmp(".stab", sectab_i->Name)
2282 && 0 != strcmp(".stabstr", sectab_i->Name)
2283 /* ignore constructor section for now */
2284 && 0 != strcmp(".ctors", sectab_i->Name)
2286 errorBelch("Unknown PEi386 section name `%s' (while processing: %s)", sectab_i->Name, oc->fileName);
2290 if (kind != SECTIONKIND_OTHER && end >= start) {
2291 addSection(oc, kind, start, end);
2292 addProddableBlock(oc, start, end - start + 1);
2296 /* Copy exported symbols into the ObjectCode. */
2298 oc->n_symbols = hdr->NumberOfSymbols;
2299 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
2300 "ocGetNames_PEi386(oc->symbols)");
2301 /* Call me paranoid; I don't care. */
2302 for (i = 0; i < oc->n_symbols; i++)
2303 oc->symbols[i] = NULL;
2307 COFF_symbol* symtab_i;
2308 if (i >= (Int32)(hdr->NumberOfSymbols)) break;
2309 symtab_i = (COFF_symbol*)
2310 myindex ( sizeof_COFF_symbol, symtab, i );
2314 if (symtab_i->StorageClass == MYIMAGE_SYM_CLASS_EXTERNAL
2315 && symtab_i->SectionNumber != MYIMAGE_SYM_UNDEFINED) {
2316 /* This symbol is global and defined, viz, exported */
2317 /* for MYIMAGE_SYMCLASS_EXTERNAL
2318 && !MYIMAGE_SYM_UNDEFINED,
2319 the address of the symbol is:
2320 address of relevant section + offset in section
2322 COFF_section* sectabent
2323 = (COFF_section*) myindex ( sizeof_COFF_section,
2325 symtab_i->SectionNumber-1 );
2326 addr = ((UChar*)(oc->image))
2327 + (sectabent->PointerToRawData
2331 if (symtab_i->SectionNumber == MYIMAGE_SYM_UNDEFINED
2332 && symtab_i->Value > 0) {
2333 /* This symbol isn't in any section at all, ie, global bss.
2334 Allocate zeroed space for it. */
2335 addr = stgCallocBytes(1, symtab_i->Value,
2336 "ocGetNames_PEi386(non-anonymous bss)");
2337 addSection(oc, SECTIONKIND_RWDATA, addr,
2338 ((UChar*)addr) + symtab_i->Value - 1);
2339 addProddableBlock(oc, addr, symtab_i->Value);
2340 /* debugBelch("BSS section at 0x%x\n", addr); */
2343 if (addr != NULL ) {
2344 sname = cstring_from_COFF_symbol_name ( symtab_i->Name, strtab );
2345 /* debugBelch("addSymbol %p `%s \n", addr,sname); */
2346 IF_DEBUG(linker, debugBelch("addSymbol %p `%s'\n", addr,sname);)
2347 ASSERT(i >= 0 && i < oc->n_symbols);
2348 /* cstring_from_COFF_symbol_name always succeeds. */
2349 oc->symbols[i] = sname;
2350 ghciInsertStrHashTable(oc->fileName, symhash, sname, addr);
2354 "IGNORING symbol %d\n"
2358 printName ( symtab_i->Name, strtab );
2367 (Int32)(symtab_i->SectionNumber),
2368 (UInt32)symtab_i->Type,
2369 (UInt32)symtab_i->StorageClass,
2370 (UInt32)symtab_i->NumberOfAuxSymbols
2375 i += symtab_i->NumberOfAuxSymbols;
2384 ocResolve_PEi386 ( ObjectCode* oc )
2387 COFF_section* sectab;
2388 COFF_symbol* symtab;
2398 /* ToDo: should be variable-sized? But is at least safe in the
2399 sense of buffer-overrun-proof. */
2401 /* debugBelch("resolving for %s\n", oc->fileName); */
2403 hdr = (COFF_header*)(oc->image);
2404 sectab = (COFF_section*) (
2405 ((UChar*)(oc->image))
2406 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2408 symtab = (COFF_symbol*) (
2409 ((UChar*)(oc->image))
2410 + hdr->PointerToSymbolTable
2412 strtab = ((UChar*)(oc->image))
2413 + hdr->PointerToSymbolTable
2414 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
2416 for (i = 0; i < hdr->NumberOfSections; i++) {
2417 COFF_section* sectab_i
2419 myindex ( sizeof_COFF_section, sectab, i );
2422 ((UChar*)(oc->image)) + sectab_i->PointerToRelocations
2425 /* Ignore sections called which contain stabs debugging
2427 if (0 == strcmp(".stab", sectab_i->Name)
2428 || 0 == strcmp(".stabstr", sectab_i->Name)
2429 || 0 == strcmp(".ctors", sectab_i->Name))
2432 if ( sectab_i->Characteristics & MYIMAGE_SCN_LNK_NRELOC_OVFL ) {
2433 /* If the relocation field (a short) has overflowed, the
2434 * real count can be found in the first reloc entry.
2436 * See Section 4.1 (last para) of the PE spec (rev6.0).
2438 * Nov2003 update: the GNU linker still doesn't correctly
2439 * handle the generation of relocatable object files with
2440 * overflown relocations. Hence the output to warn of potential
2443 COFF_reloc* rel = (COFF_reloc*)
2444 myindex ( sizeof_COFF_reloc, reltab, 0 );
2445 noRelocs = rel->VirtualAddress;
2447 /* 10/05: we now assume (and check for) a GNU ld that is capable
2448 * of handling object files with (>2^16) of relocs.
2451 debugBelch("WARNING: Overflown relocation field (# relocs found: %u)\n",
2456 noRelocs = sectab_i->NumberOfRelocations;
2461 for (; j < noRelocs; j++) {
2463 COFF_reloc* reltab_j
2465 myindex ( sizeof_COFF_reloc, reltab, j );
2467 /* the location to patch */
2469 ((UChar*)(oc->image))
2470 + (sectab_i->PointerToRawData
2471 + reltab_j->VirtualAddress
2472 - sectab_i->VirtualAddress )
2474 /* the existing contents of pP */
2476 /* the symbol to connect to */
2477 sym = (COFF_symbol*)
2478 myindex ( sizeof_COFF_symbol,
2479 symtab, reltab_j->SymbolTableIndex );
2482 "reloc sec %2d num %3d: type 0x%-4x "
2483 "vaddr 0x%-8x name `",
2485 (UInt32)reltab_j->Type,
2486 reltab_j->VirtualAddress );
2487 printName ( sym->Name, strtab );
2488 debugBelch("'\n" ));
2490 if (sym->StorageClass == MYIMAGE_SYM_CLASS_STATIC) {
2491 COFF_section* section_sym
2492 = findPEi386SectionCalled ( oc, sym->Name );
2494 errorBelch("%s: can't find section `%s'", oc->fileName, sym->Name);
2497 S = ((UInt32)(oc->image))
2498 + (section_sym->PointerToRawData
2501 copyName ( sym->Name, strtab, symbol, 1000-1 );
2502 (void*)S = lookupLocalSymbol( oc, symbol );
2503 if ((void*)S != NULL) goto foundit;
2504 (void*)S = lookupSymbol( symbol );
2505 if ((void*)S != NULL) goto foundit;
2506 zapTrailingAtSign ( symbol );
2507 (void*)S = lookupLocalSymbol( oc, symbol );
2508 if ((void*)S != NULL) goto foundit;
2509 (void*)S = lookupSymbol( symbol );
2510 if ((void*)S != NULL) goto foundit;
2511 /* Newline first because the interactive linker has printed "linking..." */
2512 errorBelch("\n%s: unknown symbol `%s'", oc->fileName, symbol);
2516 checkProddableBlock(oc, pP);
2517 switch (reltab_j->Type) {
2518 case MYIMAGE_REL_I386_DIR32:
2521 case MYIMAGE_REL_I386_REL32:
2522 /* Tricky. We have to insert a displacement at
2523 pP which, when added to the PC for the _next_
2524 insn, gives the address of the target (S).
2525 Problem is to know the address of the next insn
2526 when we only know pP. We assume that this
2527 literal field is always the last in the insn,
2528 so that the address of the next insn is pP+4
2529 -- hence the constant 4.
2530 Also I don't know if A should be added, but so
2531 far it has always been zero.
2533 SOF 05/2005: 'A' (old contents of *pP) have been observed
2534 to contain values other than zero (the 'wx' object file
2535 that came with wxhaskell-0.9.4; dunno how it was compiled..).
2536 So, add displacement to old value instead of asserting
2537 A to be zero. Fixes wxhaskell-related crashes, and no other
2538 ill effects have been observed.
2540 Update: the reason why we're seeing these more elaborate
2541 relocations is due to a switch in how the NCG compiles SRTs
2542 and offsets to them from info tables. SRTs live in .(ro)data,
2543 while info tables live in .text, causing GAS to emit REL32/DISP32
2544 relocations with non-zero values. Adding the displacement is
2545 the right thing to do.
2547 *pP = S - ((UInt32)pP) - 4 + A;
2550 debugBelch("%s: unhandled PEi386 relocation type %d",
2551 oc->fileName, reltab_j->Type);
2558 IF_DEBUG(linker, debugBelch("completed %s", oc->fileName));
2562 #endif /* defined(OBJFORMAT_PEi386) */
2565 /* --------------------------------------------------------------------------
2567 * ------------------------------------------------------------------------*/
2569 #if defined(OBJFORMAT_ELF)
2574 #if defined(sparc_HOST_ARCH)
2575 # define ELF_TARGET_SPARC /* Used inside <elf.h> */
2576 #elif defined(i386_HOST_ARCH)
2577 # define ELF_TARGET_386 /* Used inside <elf.h> */
2578 #elif defined(x86_64_HOST_ARCH)
2579 # define ELF_TARGET_X64_64
2581 #elif defined (ia64_HOST_ARCH)
2582 # define ELF_TARGET_IA64 /* Used inside <elf.h> */
2584 # define ELF_FUNCTION_DESC /* calling convention uses function descriptors */
2585 # define ELF_NEED_GOT /* needs Global Offset Table */
2586 # define ELF_NEED_PLT /* needs Procedure Linkage Tables */
2589 #if !defined(openbsd_HOST_OS)
2592 /* openbsd elf has things in different places, with diff names */
2593 #include <elf_abi.h>
2594 #include <machine/reloc.h>
2595 #define R_386_32 RELOC_32
2596 #define R_386_PC32 RELOC_PC32
2600 * Define a set of types which can be used for both ELF32 and ELF64
2604 #define ELFCLASS ELFCLASS64
2605 #define Elf_Addr Elf64_Addr
2606 #define Elf_Word Elf64_Word
2607 #define Elf_Sword Elf64_Sword
2608 #define Elf_Ehdr Elf64_Ehdr
2609 #define Elf_Phdr Elf64_Phdr
2610 #define Elf_Shdr Elf64_Shdr
2611 #define Elf_Sym Elf64_Sym
2612 #define Elf_Rel Elf64_Rel
2613 #define Elf_Rela Elf64_Rela
2614 #define ELF_ST_TYPE ELF64_ST_TYPE
2615 #define ELF_ST_BIND ELF64_ST_BIND
2616 #define ELF_R_TYPE ELF64_R_TYPE
2617 #define ELF_R_SYM ELF64_R_SYM
2619 #define ELFCLASS ELFCLASS32
2620 #define Elf_Addr Elf32_Addr
2621 #define Elf_Word Elf32_Word
2622 #define Elf_Sword Elf32_Sword
2623 #define Elf_Ehdr Elf32_Ehdr
2624 #define Elf_Phdr Elf32_Phdr
2625 #define Elf_Shdr Elf32_Shdr
2626 #define Elf_Sym Elf32_Sym
2627 #define Elf_Rel Elf32_Rel
2628 #define Elf_Rela Elf32_Rela
2630 #define ELF_ST_TYPE ELF32_ST_TYPE
2633 #define ELF_ST_BIND ELF32_ST_BIND
2636 #define ELF_R_TYPE ELF32_R_TYPE
2639 #define ELF_R_SYM ELF32_R_SYM
2645 * Functions to allocate entries in dynamic sections. Currently we simply
2646 * preallocate a large number, and we don't check if a entry for the given
2647 * target already exists (a linear search is too slow). Ideally these
2648 * entries would be associated with symbols.
2651 /* These sizes sufficient to load HSbase + HShaskell98 + a few modules */
2652 #define GOT_SIZE 0x20000
2653 #define FUNCTION_TABLE_SIZE 0x10000
2654 #define PLT_SIZE 0x08000
2657 static Elf_Addr got[GOT_SIZE];
2658 static unsigned int gotIndex;
2659 static Elf_Addr gp_val = (Elf_Addr)got;
2662 allocateGOTEntry(Elf_Addr target)
2666 if (gotIndex >= GOT_SIZE)
2667 barf("Global offset table overflow");
2669 entry = &got[gotIndex++];
2671 return (Elf_Addr)entry;
2675 #ifdef ELF_FUNCTION_DESC
2681 static FunctionDesc functionTable[FUNCTION_TABLE_SIZE];
2682 static unsigned int functionTableIndex;
2685 allocateFunctionDesc(Elf_Addr target)
2687 FunctionDesc *entry;
2689 if (functionTableIndex >= FUNCTION_TABLE_SIZE)
2690 barf("Function table overflow");
2692 entry = &functionTable[functionTableIndex++];
2694 entry->gp = (Elf_Addr)gp_val;
2695 return (Elf_Addr)entry;
2699 copyFunctionDesc(Elf_Addr target)
2701 FunctionDesc *olddesc = (FunctionDesc *)target;
2702 FunctionDesc *newdesc;
2704 newdesc = (FunctionDesc *)allocateFunctionDesc(olddesc->ip);
2705 newdesc->gp = olddesc->gp;
2706 return (Elf_Addr)newdesc;
2711 #ifdef ia64_HOST_ARCH
2712 static void ia64_reloc_gprel22(Elf_Addr target, Elf_Addr value);
2713 static void ia64_reloc_pcrel21(Elf_Addr target, Elf_Addr value, ObjectCode *oc);
2715 static unsigned char plt_code[] =
2717 /* taken from binutils bfd/elfxx-ia64.c */
2718 0x0b, 0x78, 0x00, 0x02, 0x00, 0x24, /* [MMI] addl r15=0,r1;; */
2719 0x00, 0x41, 0x3c, 0x30, 0x28, 0xc0, /* ld8 r16=[r15],8 */
2720 0x01, 0x08, 0x00, 0x84, /* mov r14=r1;; */
2721 0x11, 0x08, 0x00, 0x1e, 0x18, 0x10, /* [MIB] ld8 r1=[r15] */
2722 0x60, 0x80, 0x04, 0x80, 0x03, 0x00, /* mov b6=r16 */
2723 0x60, 0x00, 0x80, 0x00 /* br.few b6;; */
2726 /* If we can't get to the function descriptor via gp, take a local copy of it */
2727 #define PLT_RELOC(code, target) { \
2728 Elf64_Sxword rel_value = target - gp_val; \
2729 if ((rel_value > 0x1fffff) || (rel_value < -0x1fffff)) \
2730 ia64_reloc_gprel22((Elf_Addr)code, copyFunctionDesc(target)); \
2732 ia64_reloc_gprel22((Elf_Addr)code, target); \
2737 unsigned char code[sizeof(plt_code)];
2741 allocatePLTEntry(Elf_Addr target, ObjectCode *oc)
2743 PLTEntry *plt = (PLTEntry *)oc->plt;
2746 if (oc->pltIndex >= PLT_SIZE)
2747 barf("Procedure table overflow");
2749 entry = &plt[oc->pltIndex++];
2750 memcpy(entry->code, plt_code, sizeof(entry->code));
2751 PLT_RELOC(entry->code, target);
2752 return (Elf_Addr)entry;
2758 return (PLT_SIZE * sizeof(PLTEntry));
2763 #if x86_64_HOST_ARCH
2764 // On x86_64, 32-bit relocations are often used, which requires that
2765 // we can resolve a symbol to a 32-bit offset. However, shared
2766 // libraries are placed outside the 2Gb area, which leaves us with a
2767 // problem when we need to give a 32-bit offset to a symbol in a
2770 // For a function symbol, we can allocate a bounce sequence inside the
2771 // 2Gb area and resolve the symbol to this. The bounce sequence is
2772 // simply a long jump instruction to the real location of the symbol.
2774 // For data references, we're screwed.
2777 unsigned char jmp[8]; /* 6 byte instruction: jmpq *0x00000002(%rip) */
2781 #define X86_64_BB_SIZE 1024
2783 static x86_64_bounce *x86_64_bounce_buffer = NULL;
2784 static nat x86_64_bb_next_off;
2787 x86_64_high_symbol( char *lbl, void *addr )
2789 x86_64_bounce *bounce;
2791 if ( x86_64_bounce_buffer == NULL ||
2792 x86_64_bb_next_off >= X86_64_BB_SIZE ) {
2793 x86_64_bounce_buffer =
2794 mmap(NULL, X86_64_BB_SIZE * sizeof(x86_64_bounce),
2795 PROT_EXEC|PROT_READ|PROT_WRITE,
2796 MAP_PRIVATE|MAP_32BIT|MAP_ANONYMOUS, -1, 0);
2797 if (x86_64_bounce_buffer == MAP_FAILED) {
2798 barf("x86_64_high_symbol: mmap failed");
2800 x86_64_bb_next_off = 0;
2802 bounce = &x86_64_bounce_buffer[x86_64_bb_next_off];
2803 bounce->jmp[0] = 0xff;
2804 bounce->jmp[1] = 0x25;
2805 bounce->jmp[2] = 0x02;
2806 bounce->jmp[3] = 0x00;
2807 bounce->jmp[4] = 0x00;
2808 bounce->jmp[5] = 0x00;
2809 bounce->addr = addr;
2810 x86_64_bb_next_off++;
2812 IF_DEBUG(linker, debugBelch("x86_64: allocated bounce entry for %s->%p at %p\n",
2813 lbl, addr, bounce));
2815 insertStrHashTable(symhash, lbl, bounce);
2822 * Generic ELF functions
2826 findElfSection ( void* objImage, Elf_Word sh_type )
2828 char* ehdrC = (char*)objImage;
2829 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2830 Elf_Shdr* shdr = (Elf_Shdr*)(ehdrC + ehdr->e_shoff);
2831 char* sh_strtab = ehdrC + shdr[ehdr->e_shstrndx].sh_offset;
2835 for (i = 0; i < ehdr->e_shnum; i++) {
2836 if (shdr[i].sh_type == sh_type
2837 /* Ignore the section header's string table. */
2838 && i != ehdr->e_shstrndx
2839 /* Ignore string tables named .stabstr, as they contain
2841 && 0 != memcmp(".stabstr", sh_strtab + shdr[i].sh_name, 8)
2843 ptr = ehdrC + shdr[i].sh_offset;
2850 #if defined(ia64_HOST_ARCH)
2852 findElfSegment ( void* objImage, Elf_Addr vaddr )
2854 char* ehdrC = (char*)objImage;
2855 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2856 Elf_Phdr* phdr = (Elf_Phdr*)(ehdrC + ehdr->e_phoff);
2857 Elf_Addr segaddr = 0;
2860 for (i = 0; i < ehdr->e_phnum; i++) {
2861 segaddr = phdr[i].p_vaddr;
2862 if ((vaddr >= segaddr) && (vaddr < segaddr + phdr[i].p_memsz))
2870 ocVerifyImage_ELF ( ObjectCode* oc )
2874 int i, j, nent, nstrtab, nsymtabs;
2878 char* ehdrC = (char*)(oc->image);
2879 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2881 if (ehdr->e_ident[EI_MAG0] != ELFMAG0 ||
2882 ehdr->e_ident[EI_MAG1] != ELFMAG1 ||
2883 ehdr->e_ident[EI_MAG2] != ELFMAG2 ||
2884 ehdr->e_ident[EI_MAG3] != ELFMAG3) {
2885 errorBelch("%s: not an ELF object", oc->fileName);
2889 if (ehdr->e_ident[EI_CLASS] != ELFCLASS) {
2890 errorBelch("%s: unsupported ELF format", oc->fileName);
2894 if (ehdr->e_ident[EI_DATA] == ELFDATA2LSB) {
2895 IF_DEBUG(linker,debugBelch( "Is little-endian\n" ));
2897 if (ehdr->e_ident[EI_DATA] == ELFDATA2MSB) {
2898 IF_DEBUG(linker,debugBelch( "Is big-endian\n" ));
2900 errorBelch("%s: unknown endiannness", oc->fileName);
2904 if (ehdr->e_type != ET_REL) {
2905 errorBelch("%s: not a relocatable object (.o) file", oc->fileName);
2908 IF_DEBUG(linker, debugBelch( "Is a relocatable object (.o) file\n" ));
2910 IF_DEBUG(linker,debugBelch( "Architecture is " ));
2911 switch (ehdr->e_machine) {
2912 case EM_386: IF_DEBUG(linker,debugBelch( "x86" )); break;
2913 #ifdef EM_SPARC32PLUS
2914 case EM_SPARC32PLUS:
2916 case EM_SPARC: IF_DEBUG(linker,debugBelch( "sparc" )); break;
2918 case EM_IA_64: IF_DEBUG(linker,debugBelch( "ia64" )); break;
2920 case EM_PPC: IF_DEBUG(linker,debugBelch( "powerpc32" )); break;
2922 case EM_X86_64: IF_DEBUG(linker,debugBelch( "x86_64" )); break;
2924 default: IF_DEBUG(linker,debugBelch( "unknown" ));
2925 errorBelch("%s: unknown architecture", oc->fileName);
2929 IF_DEBUG(linker,debugBelch(
2930 "\nSection header table: start %ld, n_entries %d, ent_size %d\n",
2931 (long)ehdr->e_shoff, ehdr->e_shnum, ehdr->e_shentsize ));
2933 ASSERT (ehdr->e_shentsize == sizeof(Elf_Shdr));
2935 shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
2937 if (ehdr->e_shstrndx == SHN_UNDEF) {
2938 errorBelch("%s: no section header string table", oc->fileName);
2941 IF_DEBUG(linker,debugBelch( "Section header string table is section %d\n",
2943 sh_strtab = ehdrC + shdr[ehdr->e_shstrndx].sh_offset;
2946 for (i = 0; i < ehdr->e_shnum; i++) {
2947 IF_DEBUG(linker,debugBelch("%2d: ", i ));
2948 IF_DEBUG(linker,debugBelch("type=%2d ", (int)shdr[i].sh_type ));
2949 IF_DEBUG(linker,debugBelch("size=%4d ", (int)shdr[i].sh_size ));
2950 IF_DEBUG(linker,debugBelch("offs=%4d ", (int)shdr[i].sh_offset ));
2951 IF_DEBUG(linker,debugBelch(" (%p .. %p) ",
2952 ehdrC + shdr[i].sh_offset,
2953 ehdrC + shdr[i].sh_offset + shdr[i].sh_size - 1));
2955 if (shdr[i].sh_type == SHT_REL) {
2956 IF_DEBUG(linker,debugBelch("Rel " ));
2957 } else if (shdr[i].sh_type == SHT_RELA) {
2958 IF_DEBUG(linker,debugBelch("RelA " ));
2960 IF_DEBUG(linker,debugBelch(" "));
2963 IF_DEBUG(linker,debugBelch("sname=%s\n", sh_strtab + shdr[i].sh_name ));
2967 IF_DEBUG(linker,debugBelch( "\nString tables" ));
2970 for (i = 0; i < ehdr->e_shnum; i++) {
2971 if (shdr[i].sh_type == SHT_STRTAB
2972 /* Ignore the section header's string table. */
2973 && i != ehdr->e_shstrndx
2974 /* Ignore string tables named .stabstr, as they contain
2976 && 0 != memcmp(".stabstr", sh_strtab + shdr[i].sh_name, 8)
2978 IF_DEBUG(linker,debugBelch(" section %d is a normal string table", i ));
2979 strtab = ehdrC + shdr[i].sh_offset;
2984 errorBelch("%s: no string tables, or too many", oc->fileName);
2989 IF_DEBUG(linker,debugBelch( "\nSymbol tables" ));
2990 for (i = 0; i < ehdr->e_shnum; i++) {
2991 if (shdr[i].sh_type != SHT_SYMTAB) continue;
2992 IF_DEBUG(linker,debugBelch( "section %d is a symbol table\n", i ));
2994 stab = (Elf_Sym*) (ehdrC + shdr[i].sh_offset);
2995 nent = shdr[i].sh_size / sizeof(Elf_Sym);
2996 IF_DEBUG(linker,debugBelch( " number of entries is apparently %d (%ld rem)\n",
2998 (long)shdr[i].sh_size % sizeof(Elf_Sym)
3000 if (0 != shdr[i].sh_size % sizeof(Elf_Sym)) {
3001 errorBelch("%s: non-integral number of symbol table entries", oc->fileName);
3004 for (j = 0; j < nent; j++) {
3005 IF_DEBUG(linker,debugBelch(" %2d ", j ));
3006 IF_DEBUG(linker,debugBelch(" sec=%-5d size=%-3d val=%5p ",
3007 (int)stab[j].st_shndx,
3008 (int)stab[j].st_size,
3009 (char*)stab[j].st_value ));
3011 IF_DEBUG(linker,debugBelch("type=" ));
3012 switch (ELF_ST_TYPE(stab[j].st_info)) {
3013 case STT_NOTYPE: IF_DEBUG(linker,debugBelch("notype " )); break;
3014 case STT_OBJECT: IF_DEBUG(linker,debugBelch("object " )); break;
3015 case STT_FUNC : IF_DEBUG(linker,debugBelch("func " )); break;
3016 case STT_SECTION: IF_DEBUG(linker,debugBelch("section" )); break;
3017 case STT_FILE: IF_DEBUG(linker,debugBelch("file " )); break;
3018 default: IF_DEBUG(linker,debugBelch("? " )); break;
3020 IF_DEBUG(linker,debugBelch(" " ));
3022 IF_DEBUG(linker,debugBelch("bind=" ));
3023 switch (ELF_ST_BIND(stab[j].st_info)) {
3024 case STB_LOCAL : IF_DEBUG(linker,debugBelch("local " )); break;
3025 case STB_GLOBAL: IF_DEBUG(linker,debugBelch("global" )); break;
3026 case STB_WEAK : IF_DEBUG(linker,debugBelch("weak " )); break;
3027 default: IF_DEBUG(linker,debugBelch("? " )); break;
3029 IF_DEBUG(linker,debugBelch(" " ));
3031 IF_DEBUG(linker,debugBelch("name=%s\n", strtab + stab[j].st_name ));
3035 if (nsymtabs == 0) {
3036 errorBelch("%s: didn't find any symbol tables", oc->fileName);
3043 static int getSectionKind_ELF( Elf_Shdr *hdr, int *is_bss )
3047 if (hdr->sh_type == SHT_PROGBITS
3048 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_EXECINSTR)) {
3049 /* .text-style section */
3050 return SECTIONKIND_CODE_OR_RODATA;
3053 if (hdr->sh_type == SHT_PROGBITS
3054 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_WRITE)) {
3055 /* .data-style section */
3056 return SECTIONKIND_RWDATA;
3059 if (hdr->sh_type == SHT_PROGBITS
3060 && (hdr->sh_flags & SHF_ALLOC) && !(hdr->sh_flags & SHF_WRITE)) {
3061 /* .rodata-style section */
3062 return SECTIONKIND_CODE_OR_RODATA;
3065 if (hdr->sh_type == SHT_NOBITS
3066 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_WRITE)) {
3067 /* .bss-style section */
3069 return SECTIONKIND_RWDATA;
3072 return SECTIONKIND_OTHER;
3077 ocGetNames_ELF ( ObjectCode* oc )
3082 char* ehdrC = (char*)(oc->image);
3083 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
3084 char* strtab = findElfSection ( ehdrC, SHT_STRTAB );
3085 Elf_Shdr* shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
3087 ASSERT(symhash != NULL);
3090 errorBelch("%s: no strtab", oc->fileName);
3095 for (i = 0; i < ehdr->e_shnum; i++) {
3096 /* Figure out what kind of section it is. Logic derived from
3097 Figure 1.14 ("Special Sections") of the ELF document
3098 ("Portable Formats Specification, Version 1.1"). */
3100 SectionKind kind = getSectionKind_ELF(&shdr[i], &is_bss);
3102 if (is_bss && shdr[i].sh_size > 0) {
3103 /* This is a non-empty .bss section. Allocate zeroed space for
3104 it, and set its .sh_offset field such that
3105 ehdrC + .sh_offset == addr_of_zeroed_space. */
3106 char* zspace = stgCallocBytes(1, shdr[i].sh_size,
3107 "ocGetNames_ELF(BSS)");
3108 shdr[i].sh_offset = ((char*)zspace) - ((char*)ehdrC);
3110 debugBelch("BSS section at 0x%x, size %d\n",
3111 zspace, shdr[i].sh_size);
3115 /* fill in the section info */
3116 if (kind != SECTIONKIND_OTHER && shdr[i].sh_size > 0) {
3117 addProddableBlock(oc, ehdrC + shdr[i].sh_offset, shdr[i].sh_size);
3118 addSection(oc, kind, ehdrC + shdr[i].sh_offset,
3119 ehdrC + shdr[i].sh_offset + shdr[i].sh_size - 1);
3122 if (shdr[i].sh_type != SHT_SYMTAB) continue;
3124 /* copy stuff into this module's object symbol table */
3125 stab = (Elf_Sym*) (ehdrC + shdr[i].sh_offset);
3126 nent = shdr[i].sh_size / sizeof(Elf_Sym);
3128 oc->n_symbols = nent;
3129 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
3130 "ocGetNames_ELF(oc->symbols)");
3132 for (j = 0; j < nent; j++) {
3134 char isLocal = FALSE; /* avoids uninit-var warning */
3136 char* nm = strtab + stab[j].st_name;
3137 int secno = stab[j].st_shndx;
3139 /* Figure out if we want to add it; if so, set ad to its
3140 address. Otherwise leave ad == NULL. */
3142 if (secno == SHN_COMMON) {
3144 ad = stgCallocBytes(1, stab[j].st_size, "ocGetNames_ELF(COMMON)");
3146 debugBelch("COMMON symbol, size %d name %s\n",
3147 stab[j].st_size, nm);
3149 /* Pointless to do addProddableBlock() for this area,
3150 since the linker should never poke around in it. */
3153 if ( ( ELF_ST_BIND(stab[j].st_info)==STB_GLOBAL
3154 || ELF_ST_BIND(stab[j].st_info)==STB_LOCAL
3156 /* and not an undefined symbol */
3157 && stab[j].st_shndx != SHN_UNDEF
3158 /* and not in a "special section" */
3159 && stab[j].st_shndx < SHN_LORESERVE
3161 /* and it's a not a section or string table or anything silly */
3162 ( ELF_ST_TYPE(stab[j].st_info)==STT_FUNC ||
3163 ELF_ST_TYPE(stab[j].st_info)==STT_OBJECT ||
3164 ELF_ST_TYPE(stab[j].st_info)==STT_NOTYPE
3167 /* Section 0 is the undefined section, hence > and not >=. */
3168 ASSERT(secno > 0 && secno < ehdr->e_shnum);
3170 if (shdr[secno].sh_type == SHT_NOBITS) {
3171 debugBelch(" BSS symbol, size %d off %d name %s\n",
3172 stab[j].st_size, stab[j].st_value, nm);
3175 ad = ehdrC + shdr[ secno ].sh_offset + stab[j].st_value;
3176 if (ELF_ST_BIND(stab[j].st_info)==STB_LOCAL) {
3179 #ifdef ELF_FUNCTION_DESC
3180 /* dlsym() and the initialisation table both give us function
3181 * descriptors, so to be consistent we store function descriptors
3182 * in the symbol table */
3183 if (ELF_ST_TYPE(stab[j].st_info) == STT_FUNC)
3184 ad = (char *)allocateFunctionDesc((Elf_Addr)ad);
3186 IF_DEBUG(linker,debugBelch( "addOTabName(GLOB): %10p %s %s",
3187 ad, oc->fileName, nm ));
3192 /* And the decision is ... */
3196 oc->symbols[j] = nm;
3199 /* Ignore entirely. */
3201 ghciInsertStrHashTable(oc->fileName, symhash, nm, ad);
3205 IF_DEBUG(linker,debugBelch( "skipping `%s'\n",
3206 strtab + stab[j].st_name ));
3209 "skipping bind = %d, type = %d, shndx = %d `%s'\n",
3210 (int)ELF_ST_BIND(stab[j].st_info),
3211 (int)ELF_ST_TYPE(stab[j].st_info),
3212 (int)stab[j].st_shndx,
3213 strtab + stab[j].st_name
3216 oc->symbols[j] = NULL;
3225 /* Do ELF relocations which lack an explicit addend. All x86-linux
3226 relocations appear to be of this form. */
3228 do_Elf_Rel_relocations ( ObjectCode* oc, char* ehdrC,
3229 Elf_Shdr* shdr, int shnum,
3230 Elf_Sym* stab, char* strtab )
3235 Elf_Rel* rtab = (Elf_Rel*) (ehdrC + shdr[shnum].sh_offset);
3236 int nent = shdr[shnum].sh_size / sizeof(Elf_Rel);
3237 int target_shndx = shdr[shnum].sh_info;
3238 int symtab_shndx = shdr[shnum].sh_link;
3240 stab = (Elf_Sym*) (ehdrC + shdr[ symtab_shndx ].sh_offset);
3241 targ = (Elf_Word*)(ehdrC + shdr[ target_shndx ].sh_offset);
3242 IF_DEBUG(linker,debugBelch( "relocations for section %d using symtab %d\n",
3243 target_shndx, symtab_shndx ));
3245 /* Skip sections that we're not interested in. */
3248 SectionKind kind = getSectionKind_ELF(&shdr[target_shndx], &is_bss);
3249 if (kind == SECTIONKIND_OTHER) {
3250 IF_DEBUG(linker,debugBelch( "skipping (target section not loaded)"));
3255 for (j = 0; j < nent; j++) {
3256 Elf_Addr offset = rtab[j].r_offset;
3257 Elf_Addr info = rtab[j].r_info;
3259 Elf_Addr P = ((Elf_Addr)targ) + offset;
3260 Elf_Word* pP = (Elf_Word*)P;
3265 StgStablePtr stablePtr;
3268 IF_DEBUG(linker,debugBelch( "Rel entry %3d is raw(%6p %6p)",
3269 j, (void*)offset, (void*)info ));
3271 IF_DEBUG(linker,debugBelch( " ZERO" ));
3274 Elf_Sym sym = stab[ELF_R_SYM(info)];
3275 /* First see if it is a local symbol. */
3276 if (ELF_ST_BIND(sym.st_info) == STB_LOCAL) {
3277 /* Yes, so we can get the address directly from the ELF symbol
3279 symbol = sym.st_name==0 ? "(noname)" : strtab+sym.st_name;
3281 (ehdrC + shdr[ sym.st_shndx ].sh_offset
3282 + stab[ELF_R_SYM(info)].st_value);
3285 symbol = strtab + sym.st_name;
3286 stablePtr = (StgStablePtr)lookupHashTable(stablehash, (StgWord)symbol);
3287 if (NULL == stablePtr) {
3288 /* No, so look up the name in our global table. */
3289 S_tmp = lookupSymbol( symbol );
3290 S = (Elf_Addr)S_tmp;
3292 stableVal = deRefStablePtr( stablePtr );
3293 addRootObject((void*)P);
3295 S = (Elf_Addr)S_tmp;
3299 errorBelch("%s: unknown symbol `%s'", oc->fileName, symbol);
3302 IF_DEBUG(linker,debugBelch( "`%s' resolves to %p\n", symbol, (void*)S ));
3305 IF_DEBUG(linker,debugBelch( "Reloc: P = %p S = %p A = %p\n",
3306 (void*)P, (void*)S, (void*)A ));
3307 checkProddableBlock ( oc, pP );
3311 switch (ELF_R_TYPE(info)) {
3312 # ifdef i386_HOST_ARCH
3313 case R_386_32: *pP = value; break;
3314 case R_386_PC32: *pP = value - P; break;
3317 errorBelch("%s: unhandled ELF relocation(Rel) type %lu\n",
3318 oc->fileName, (lnat)ELF_R_TYPE(info));
3326 /* Do ELF relocations for which explicit addends are supplied.
3327 sparc-solaris relocations appear to be of this form. */
3329 do_Elf_Rela_relocations ( ObjectCode* oc, char* ehdrC,
3330 Elf_Shdr* shdr, int shnum,
3331 Elf_Sym* stab, char* strtab )
3334 char *symbol = NULL;
3336 Elf_Rela* rtab = (Elf_Rela*) (ehdrC + shdr[shnum].sh_offset);
3337 int nent = shdr[shnum].sh_size / sizeof(Elf_Rela);
3338 int target_shndx = shdr[shnum].sh_info;
3339 int symtab_shndx = shdr[shnum].sh_link;
3341 stab = (Elf_Sym*) (ehdrC + shdr[ symtab_shndx ].sh_offset);
3342 targ = (Elf_Addr) (ehdrC + shdr[ target_shndx ].sh_offset);
3343 IF_DEBUG(linker,debugBelch( "relocations for section %d using symtab %d\n",
3344 target_shndx, symtab_shndx ));
3346 for (j = 0; j < nent; j++) {
3347 #if defined(DEBUG) || defined(sparc_HOST_ARCH) || defined(ia64_HOST_ARCH) || defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH)
3348 /* This #ifdef only serves to avoid unused-var warnings. */
3349 Elf_Addr offset = rtab[j].r_offset;
3350 Elf_Addr P = targ + offset;
3352 Elf_Addr info = rtab[j].r_info;
3353 Elf_Addr A = rtab[j].r_addend;
3357 # if defined(sparc_HOST_ARCH)
3358 Elf_Word* pP = (Elf_Word*)P;
3360 # elif defined(ia64_HOST_ARCH)
3361 Elf64_Xword *pP = (Elf64_Xword *)P;
3363 # elif defined(powerpc_HOST_ARCH)
3367 IF_DEBUG(linker,debugBelch( "Rel entry %3d is raw(%6p %6p %6p) ",
3368 j, (void*)offset, (void*)info,
3371 IF_DEBUG(linker,debugBelch( " ZERO" ));
3374 Elf_Sym sym = stab[ELF_R_SYM(info)];
3375 /* First see if it is a local symbol. */
3376 if (ELF_ST_BIND(sym.st_info) == STB_LOCAL) {
3377 /* Yes, so we can get the address directly from the ELF symbol
3379 symbol = sym.st_name==0 ? "(noname)" : strtab+sym.st_name;
3381 (ehdrC + shdr[ sym.st_shndx ].sh_offset
3382 + stab[ELF_R_SYM(info)].st_value);
3383 #ifdef ELF_FUNCTION_DESC
3384 /* Make a function descriptor for this function */
3385 if (S && ELF_ST_TYPE(sym.st_info) == STT_FUNC) {
3386 S = allocateFunctionDesc(S + A);
3391 /* No, so look up the name in our global table. */
3392 symbol = strtab + sym.st_name;
3393 S_tmp = lookupSymbol( symbol );
3394 S = (Elf_Addr)S_tmp;
3396 #ifdef ELF_FUNCTION_DESC
3397 /* If a function, already a function descriptor - we would
3398 have to copy it to add an offset. */
3399 if (S && (ELF_ST_TYPE(sym.st_info) == STT_FUNC) && (A != 0))
3400 errorBelch("%s: function %s with addend %p", oc->fileName, symbol, (void *)A);
3404 errorBelch("%s: unknown symbol `%s'", oc->fileName, symbol);
3407 IF_DEBUG(linker,debugBelch( "`%s' resolves to %p", symbol, (void*)S ));
3410 IF_DEBUG(linker,debugBelch("Reloc: P = %p S = %p A = %p\n",
3411 (void*)P, (void*)S, (void*)A ));
3412 /* checkProddableBlock ( oc, (void*)P ); */
3416 switch (ELF_R_TYPE(info)) {
3417 # if defined(sparc_HOST_ARCH)
3418 case R_SPARC_WDISP30:
3419 w1 = *pP & 0xC0000000;
3420 w2 = (Elf_Word)((value - P) >> 2);
3421 ASSERT((w2 & 0xC0000000) == 0);
3426 w1 = *pP & 0xFFC00000;
3427 w2 = (Elf_Word)(value >> 10);
3428 ASSERT((w2 & 0xFFC00000) == 0);
3434 w2 = (Elf_Word)(value & 0x3FF);
3435 ASSERT((w2 & ~0x3FF) == 0);
3439 /* According to the Sun documentation:
3441 This relocation type resembles R_SPARC_32, except it refers to an
3442 unaligned word. That is, the word to be relocated must be treated
3443 as four separate bytes with arbitrary alignment, not as a word
3444 aligned according to the architecture requirements.
3446 (JRS: which means that freeloading on the R_SPARC_32 case
3447 is probably wrong, but hey ...)
3451 w2 = (Elf_Word)value;
3454 # elif defined(ia64_HOST_ARCH)
3455 case R_IA64_DIR64LSB:
3456 case R_IA64_FPTR64LSB:
3459 case R_IA64_PCREL64LSB:
3462 case R_IA64_SEGREL64LSB:
3463 addr = findElfSegment(ehdrC, value);
3466 case R_IA64_GPREL22:
3467 ia64_reloc_gprel22(P, value);
3469 case R_IA64_LTOFF22:
3470 case R_IA64_LTOFF22X:
3471 case R_IA64_LTOFF_FPTR22:
3472 addr = allocateGOTEntry(value);
3473 ia64_reloc_gprel22(P, addr);
3475 case R_IA64_PCREL21B:
3476 ia64_reloc_pcrel21(P, S, oc);
3479 /* This goes with R_IA64_LTOFF22X and points to the load to
3480 * convert into a move. We don't implement relaxation. */
3482 # elif defined(powerpc_HOST_ARCH)
3483 case R_PPC_ADDR16_LO:
3484 *(Elf32_Half*) P = value;
3487 case R_PPC_ADDR16_HI:
3488 *(Elf32_Half*) P = value >> 16;
3491 case R_PPC_ADDR16_HA:
3492 *(Elf32_Half*) P = (value + 0x8000) >> 16;
3496 *(Elf32_Word *) P = value;
3500 *(Elf32_Word *) P = value - P;
3506 if( delta << 6 >> 6 != delta )
3508 value = makeJumpIsland( oc, ELF_R_SYM(info), value );
3511 if( value == 0 || delta << 6 >> 6 != delta )
3513 barf( "Unable to make ppcJumpIsland for #%d",
3519 *(Elf_Word *) P = (*(Elf_Word *) P & 0xfc000003)
3520 | (delta & 0x3fffffc);
3524 #if x86_64_HOST_ARCH
3526 *(Elf64_Xword *)P = value;
3531 StgInt64 off = value - P;
3532 if (off >= 0x7fffffffL || off < -0x80000000L) {
3533 barf("R_X86_64_PC32 relocation out of range: %s = %p",
3536 *(Elf64_Word *)P = (Elf64_Word)off;
3541 if (value >= 0x7fffffffL) {
3542 barf("R_X86_64_32 relocation out of range: %s = %p\n",
3545 *(Elf64_Word *)P = (Elf64_Word)value;
3549 if ((StgInt64)value > 0x7fffffffL || (StgInt64)value < -0x80000000L) {
3550 barf("R_X86_64_32S relocation out of range: %s = %p\n",
3553 *(Elf64_Sword *)P = (Elf64_Sword)value;
3558 errorBelch("%s: unhandled ELF relocation(RelA) type %lu\n",
3559 oc->fileName, (lnat)ELF_R_TYPE(info));
3568 ocResolve_ELF ( ObjectCode* oc )
3572 Elf_Sym* stab = NULL;
3573 char* ehdrC = (char*)(oc->image);
3574 Elf_Ehdr* ehdr = (Elf_Ehdr*) ehdrC;
3575 Elf_Shdr* shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
3577 /* first find "the" symbol table */
3578 stab = (Elf_Sym*) findElfSection ( ehdrC, SHT_SYMTAB );
3580 /* also go find the string table */
3581 strtab = findElfSection ( ehdrC, SHT_STRTAB );
3583 if (stab == NULL || strtab == NULL) {
3584 errorBelch("%s: can't find string or symbol table", oc->fileName);
3588 /* Process the relocation sections. */
3589 for (shnum = 0; shnum < ehdr->e_shnum; shnum++) {
3590 if (shdr[shnum].sh_type == SHT_REL) {
3591 ok = do_Elf_Rel_relocations ( oc, ehdrC, shdr,
3592 shnum, stab, strtab );
3596 if (shdr[shnum].sh_type == SHT_RELA) {
3597 ok = do_Elf_Rela_relocations ( oc, ehdrC, shdr,
3598 shnum, stab, strtab );
3603 /* Free the local symbol table; we won't need it again. */
3604 freeHashTable(oc->lochash, NULL);
3607 #if defined(powerpc_HOST_ARCH)
3608 ocFlushInstructionCache( oc );
3616 * Instructions are 41 bits long, packed into 128 bit bundles with a 5-bit template
3617 * at the front. The following utility functions pack and unpack instructions, and
3618 * take care of the most common relocations.
3621 #ifdef ia64_HOST_ARCH
3624 ia64_extract_instruction(Elf64_Xword *target)
3627 int slot = (Elf_Addr)target & 3;
3628 target = (Elf_Addr)target & ~3;
3636 return ((w1 >> 5) & 0x1ffffffffff);
3638 return (w1 >> 46) | ((w2 & 0x7fffff) << 18);
3642 barf("ia64_extract_instruction: invalid slot %p", target);
3647 ia64_deposit_instruction(Elf64_Xword *target, Elf64_Xword value)
3649 int slot = (Elf_Addr)target & 3;
3650 target = (Elf_Addr)target & ~3;
3655 *target |= value << 5;
3658 *target |= value << 46;
3659 *(target+1) |= value >> 18;
3662 *(target+1) |= value << 23;
3668 ia64_reloc_gprel22(Elf_Addr target, Elf_Addr value)
3670 Elf64_Xword instruction;
3671 Elf64_Sxword rel_value;
3673 rel_value = value - gp_val;
3674 if ((rel_value > 0x1fffff) || (rel_value < -0x1fffff))
3675 barf("GP-relative data out of range (address = 0x%lx, gp = 0x%lx)", value, gp_val);
3677 instruction = ia64_extract_instruction((Elf64_Xword *)target);
3678 instruction |= (((rel_value >> 0) & 0x07f) << 13) /* imm7b */
3679 | (((rel_value >> 7) & 0x1ff) << 27) /* imm9d */
3680 | (((rel_value >> 16) & 0x01f) << 22) /* imm5c */
3681 | ((Elf64_Xword)(rel_value < 0) << 36); /* s */
3682 ia64_deposit_instruction((Elf64_Xword *)target, instruction);
3686 ia64_reloc_pcrel21(Elf_Addr target, Elf_Addr value, ObjectCode *oc)
3688 Elf64_Xword instruction;
3689 Elf64_Sxword rel_value;
3692 entry = allocatePLTEntry(value, oc);
3694 rel_value = (entry >> 4) - (target >> 4);
3695 if ((rel_value > 0xfffff) || (rel_value < -0xfffff))
3696 barf("PLT entry too far away (entry = 0x%lx, target = 0x%lx)", entry, target);
3698 instruction = ia64_extract_instruction((Elf64_Xword *)target);
3699 instruction |= ((rel_value & 0xfffff) << 13) /* imm20b */
3700 | ((Elf64_Xword)(rel_value < 0) << 36); /* s */
3701 ia64_deposit_instruction((Elf64_Xword *)target, instruction);
3707 * PowerPC ELF specifics
3710 #ifdef powerpc_HOST_ARCH
3712 static int ocAllocateJumpIslands_ELF( ObjectCode *oc )
3718 ehdr = (Elf_Ehdr *) oc->image;
3719 shdr = (Elf_Shdr *) ( ((char *)oc->image) + ehdr->e_shoff );
3721 for( i = 0; i < ehdr->e_shnum; i++ )
3722 if( shdr[i].sh_type == SHT_SYMTAB )
3725 if( i == ehdr->e_shnum )
3727 errorBelch( "This ELF file contains no symtab" );
3731 if( shdr[i].sh_entsize != sizeof( Elf_Sym ) )
3733 errorBelch( "The entry size (%d) of the symtab isn't %d\n",
3734 shdr[i].sh_entsize, sizeof( Elf_Sym ) );
3739 return ocAllocateJumpIslands( oc, shdr[i].sh_size / sizeof( Elf_Sym ), 0 );
3742 #endif /* powerpc */
3746 /* --------------------------------------------------------------------------
3748 * ------------------------------------------------------------------------*/
3750 #if defined(OBJFORMAT_MACHO)
3753 Support for MachO linking on Darwin/MacOS X
3754 by Wolfgang Thaller (wolfgang.thaller@gmx.net)
3756 I hereby formally apologize for the hackish nature of this code.
3757 Things that need to be done:
3758 *) implement ocVerifyImage_MachO
3759 *) add still more sanity checks.
3762 #ifdef powerpc_HOST_ARCH
3763 static int ocAllocateJumpIslands_MachO(ObjectCode* oc)
3765 struct mach_header *header = (struct mach_header *) oc->image;
3766 struct load_command *lc = (struct load_command *) (header + 1);
3769 for( i = 0; i < header->ncmds; i++ )
3771 if( lc->cmd == LC_SYMTAB )
3773 // Find out the first and last undefined external
3774 // symbol, so we don't have to allocate too many
3776 struct symtab_command *symLC = (struct symtab_command *) lc;
3777 unsigned min = symLC->nsyms, max = 0;
3778 struct nlist *nlist =
3779 symLC ? (struct nlist*) ((char*) oc->image + symLC->symoff)
3781 for(i=0;i<symLC->nsyms;i++)
3783 if(nlist[i].n_type & N_STAB)
3785 else if(nlist[i].n_type & N_EXT)
3787 if((nlist[i].n_type & N_TYPE) == N_UNDF
3788 && (nlist[i].n_value == 0))
3798 return ocAllocateJumpIslands(oc, max - min + 1, min);
3803 lc = (struct load_command *) ( ((char *)lc) + lc->cmdsize );
3805 return ocAllocateJumpIslands(oc,0,0);
3809 static int ocVerifyImage_MachO(ObjectCode* oc STG_UNUSED)
3811 // FIXME: do some verifying here
3815 static int resolveImports(
3818 struct symtab_command *symLC,
3819 struct section *sect, // ptr to lazy or non-lazy symbol pointer section
3820 unsigned long *indirectSyms,
3821 struct nlist *nlist)
3824 size_t itemSize = 4;
3827 int isJumpTable = 0;
3828 if(!strcmp(sect->sectname,"__jump_table"))
3832 ASSERT(sect->reserved2 == itemSize);
3836 for(i=0; i*itemSize < sect->size;i++)
3838 // according to otool, reserved1 contains the first index into the indirect symbol table
3839 struct nlist *symbol = &nlist[indirectSyms[sect->reserved1+i]];
3840 char *nm = image + symLC->stroff + symbol->n_un.n_strx;
3843 if((symbol->n_type & N_TYPE) == N_UNDF
3844 && (symbol->n_type & N_EXT) && (symbol->n_value != 0))
3845 addr = (void*) (symbol->n_value);
3846 else if((addr = lookupLocalSymbol(oc,nm)) != NULL)
3849 addr = lookupSymbol(nm);
3852 errorBelch("\n%s: unknown symbol `%s'", oc->fileName, nm);
3860 checkProddableBlock(oc,image + sect->offset + i*itemSize);
3861 *(image + sect->offset + i*itemSize) = 0xe9; // jmp
3862 *(unsigned*)(image + sect->offset + i*itemSize + 1)
3863 = (char*)addr - (image + sect->offset + i*itemSize + 5);
3868 checkProddableBlock(oc,((void**)(image + sect->offset)) + i);
3869 ((void**)(image + sect->offset))[i] = addr;
3876 static unsigned long relocateAddress(
3879 struct section* sections,
3880 unsigned long address)
3883 for(i = 0; i < nSections; i++)
3885 if(sections[i].addr <= address
3886 && address < sections[i].addr + sections[i].size)
3888 return (unsigned long)oc->image
3889 + sections[i].offset + address - sections[i].addr;
3892 barf("Invalid Mach-O file:"
3893 "Address out of bounds while relocating object file");
3897 static int relocateSection(
3900 struct symtab_command *symLC, struct nlist *nlist,
3901 int nSections, struct section* sections, struct section *sect)
3903 struct relocation_info *relocs;
3906 if(!strcmp(sect->sectname,"__la_symbol_ptr"))
3908 else if(!strcmp(sect->sectname,"__nl_symbol_ptr"))
3910 else if(!strcmp(sect->sectname,"__la_sym_ptr2"))
3912 else if(!strcmp(sect->sectname,"__la_sym_ptr3"))
3916 relocs = (struct relocation_info*) (image + sect->reloff);
3920 if(relocs[i].r_address & R_SCATTERED)
3922 struct scattered_relocation_info *scat =
3923 (struct scattered_relocation_info*) &relocs[i];
3927 if(scat->r_length == 2)
3929 unsigned long word = 0;
3930 unsigned long* wordPtr = (unsigned long*) (image + sect->offset + scat->r_address);
3931 checkProddableBlock(oc,wordPtr);
3933 // Note on relocation types:
3934 // i386 uses the GENERIC_RELOC_* types,
3935 // while ppc uses special PPC_RELOC_* types.
3936 // *_RELOC_VANILLA and *_RELOC_PAIR have the same value
3937 // in both cases, all others are different.
3938 // Therefore, we use GENERIC_RELOC_VANILLA
3939 // and GENERIC_RELOC_PAIR instead of the PPC variants,
3940 // and use #ifdefs for the other types.
3942 // Step 1: Figure out what the relocated value should be
3943 if(scat->r_type == GENERIC_RELOC_VANILLA)
3945 word = *wordPtr + (unsigned long) relocateAddress(
3952 #ifdef powerpc_HOST_ARCH
3953 else if(scat->r_type == PPC_RELOC_SECTDIFF
3954 || scat->r_type == PPC_RELOC_LO16_SECTDIFF
3955 || scat->r_type == PPC_RELOC_HI16_SECTDIFF
3956 || scat->r_type == PPC_RELOC_HA16_SECTDIFF)
3958 else if(scat->r_type == GENERIC_RELOC_SECTDIFF)
3961 struct scattered_relocation_info *pair =
3962 (struct scattered_relocation_info*) &relocs[i+1];
3964 if(!pair->r_scattered || pair->r_type != GENERIC_RELOC_PAIR)
3965 barf("Invalid Mach-O file: "
3966 "RELOC_*_SECTDIFF not followed by RELOC_PAIR");
3968 word = (unsigned long)
3969 (relocateAddress(oc, nSections, sections, scat->r_value)
3970 - relocateAddress(oc, nSections, sections, pair->r_value));
3973 #ifdef powerpc_HOST_ARCH
3974 else if(scat->r_type == PPC_RELOC_HI16
3975 || scat->r_type == PPC_RELOC_LO16
3976 || scat->r_type == PPC_RELOC_HA16
3977 || scat->r_type == PPC_RELOC_LO14)
3978 { // these are generated by label+offset things
3979 struct relocation_info *pair = &relocs[i+1];
3980 if((pair->r_address & R_SCATTERED) || pair->r_type != PPC_RELOC_PAIR)
3981 barf("Invalid Mach-O file: "
3982 "PPC_RELOC_* not followed by PPC_RELOC_PAIR");
3984 if(scat->r_type == PPC_RELOC_LO16)
3986 word = ((unsigned short*) wordPtr)[1];
3987 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
3989 else if(scat->r_type == PPC_RELOC_LO14)
3991 barf("Unsupported Relocation: PPC_RELOC_LO14");
3992 word = ((unsigned short*) wordPtr)[1] & 0xFFFC;
3993 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
3995 else if(scat->r_type == PPC_RELOC_HI16)
3997 word = ((unsigned short*) wordPtr)[1] << 16;
3998 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF);
4000 else if(scat->r_type == PPC_RELOC_HA16)
4002 word = ((unsigned short*) wordPtr)[1] << 16;
4003 word += ((short)relocs[i+1].r_address & (short)0xFFFF);
4007 word += (unsigned long) relocateAddress(oc, nSections, sections, scat->r_value)
4014 continue; // ignore the others
4016 #ifdef powerpc_HOST_ARCH
4017 if(scat->r_type == GENERIC_RELOC_VANILLA
4018 || scat->r_type == PPC_RELOC_SECTDIFF)
4020 if(scat->r_type == GENERIC_RELOC_VANILLA
4021 || scat->r_type == GENERIC_RELOC_SECTDIFF)
4026 #ifdef powerpc_HOST_ARCH
4027 else if(scat->r_type == PPC_RELOC_LO16_SECTDIFF || scat->r_type == PPC_RELOC_LO16)
4029 ((unsigned short*) wordPtr)[1] = word & 0xFFFF;
4031 else if(scat->r_type == PPC_RELOC_HI16_SECTDIFF || scat->r_type == PPC_RELOC_HI16)
4033 ((unsigned short*) wordPtr)[1] = (word >> 16) & 0xFFFF;
4035 else if(scat->r_type == PPC_RELOC_HA16_SECTDIFF || scat->r_type == PPC_RELOC_HA16)
4037 ((unsigned short*) wordPtr)[1] = ((word >> 16) & 0xFFFF)
4038 + ((word & (1<<15)) ? 1 : 0);
4044 continue; // FIXME: I hope it's OK to ignore all the others.
4048 struct relocation_info *reloc = &relocs[i];
4049 if(reloc->r_pcrel && !reloc->r_extern)
4052 if(reloc->r_length == 2)
4054 unsigned long word = 0;
4055 #ifdef powerpc_HOST_ARCH
4056 unsigned long jumpIsland = 0;
4057 long offsetToJumpIsland = 0xBADBAD42; // initialise to bad value
4058 // to avoid warning and to catch
4062 unsigned long* wordPtr = (unsigned long*) (image + sect->offset + reloc->r_address);
4063 checkProddableBlock(oc,wordPtr);
4065 if(reloc->r_type == GENERIC_RELOC_VANILLA)
4069 #ifdef powerpc_HOST_ARCH
4070 else if(reloc->r_type == PPC_RELOC_LO16)
4072 word = ((unsigned short*) wordPtr)[1];
4073 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
4075 else if(reloc->r_type == PPC_RELOC_HI16)
4077 word = ((unsigned short*) wordPtr)[1] << 16;
4078 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF);
4080 else if(reloc->r_type == PPC_RELOC_HA16)
4082 word = ((unsigned short*) wordPtr)[1] << 16;
4083 word += ((short)relocs[i+1].r_address & (short)0xFFFF);
4085 else if(reloc->r_type == PPC_RELOC_BR24)
4088 word = (word & 0x03FFFFFC) | ((word & 0x02000000) ? 0xFC000000 : 0);
4092 if(!reloc->r_extern)
4095 sections[reloc->r_symbolnum-1].offset
4096 - sections[reloc->r_symbolnum-1].addr
4103 struct nlist *symbol = &nlist[reloc->r_symbolnum];
4104 char *nm = image + symLC->stroff + symbol->n_un.n_strx;
4105 void *symbolAddress = lookupSymbol(nm);
4108 errorBelch("\nunknown symbol `%s'", nm);
4114 #ifdef powerpc_HOST_ARCH
4115 // In the .o file, this should be a relative jump to NULL
4116 // and we'll change it to a relative jump to the symbol
4117 ASSERT(-word == reloc->r_address);
4118 jumpIsland = makeJumpIsland(oc,reloc->r_symbolnum,(unsigned long) symbolAddress);
4121 offsetToJumpIsland = word + jumpIsland
4122 - (((long)image) + sect->offset - sect->addr);
4125 word += (unsigned long) symbolAddress
4126 - (((long)image) + sect->offset - sect->addr);
4130 word += (unsigned long) symbolAddress;
4134 if(reloc->r_type == GENERIC_RELOC_VANILLA)
4139 #ifdef powerpc_HOST_ARCH
4140 else if(reloc->r_type == PPC_RELOC_LO16)
4142 ((unsigned short*) wordPtr)[1] = word & 0xFFFF;
4145 else if(reloc->r_type == PPC_RELOC_HI16)
4147 ((unsigned short*) wordPtr)[1] = (word >> 16) & 0xFFFF;
4150 else if(reloc->r_type == PPC_RELOC_HA16)
4152 ((unsigned short*) wordPtr)[1] = ((word >> 16) & 0xFFFF)
4153 + ((word & (1<<15)) ? 1 : 0);
4156 else if(reloc->r_type == PPC_RELOC_BR24)
4158 if((long)word > (long)0x01FFFFFF || (long)word < (long)0xFFE00000)
4160 // The branch offset is too large.
4161 // Therefore, we try to use a jump island.
4164 barf("unconditional relative branch out of range: "
4165 "no jump island available");
4168 word = offsetToJumpIsland;
4169 if((long)word > (long)0x01FFFFFF || (long)word < (long)0xFFE00000)
4170 barf("unconditional relative branch out of range: "
4171 "jump island out of range");
4173 *wordPtr = (*wordPtr & 0xFC000003) | (word & 0x03FFFFFC);
4178 barf("\nunknown relocation %d",reloc->r_type);
4185 static int ocGetNames_MachO(ObjectCode* oc)
4187 char *image = (char*) oc->image;
4188 struct mach_header *header = (struct mach_header*) image;
4189 struct load_command *lc = (struct load_command*) (image + sizeof(struct mach_header));
4190 unsigned i,curSymbol = 0;
4191 struct segment_command *segLC = NULL;
4192 struct section *sections;
4193 struct symtab_command *symLC = NULL;
4194 struct nlist *nlist;
4195 unsigned long commonSize = 0;
4196 char *commonStorage = NULL;
4197 unsigned long commonCounter;
4199 for(i=0;i<header->ncmds;i++)
4201 if(lc->cmd == LC_SEGMENT)
4202 segLC = (struct segment_command*) lc;
4203 else if(lc->cmd == LC_SYMTAB)
4204 symLC = (struct symtab_command*) lc;
4205 lc = (struct load_command *) ( ((char*)lc) + lc->cmdsize );
4208 sections = (struct section*) (segLC+1);
4209 nlist = symLC ? (struct nlist*) (image + symLC->symoff)
4212 for(i=0;i<segLC->nsects;i++)
4214 if(sections[i].size == 0)
4217 if((sections[i].flags & SECTION_TYPE) == S_ZEROFILL)
4219 char * zeroFillArea = stgCallocBytes(1,sections[i].size,
4220 "ocGetNames_MachO(common symbols)");
4221 sections[i].offset = zeroFillArea - image;
4224 if(!strcmp(sections[i].sectname,"__text"))
4225 addSection(oc, SECTIONKIND_CODE_OR_RODATA,
4226 (void*) (image + sections[i].offset),
4227 (void*) (image + sections[i].offset + sections[i].size));
4228 else if(!strcmp(sections[i].sectname,"__const"))
4229 addSection(oc, SECTIONKIND_RWDATA,
4230 (void*) (image + sections[i].offset),
4231 (void*) (image + sections[i].offset + sections[i].size));
4232 else if(!strcmp(sections[i].sectname,"__data"))
4233 addSection(oc, SECTIONKIND_RWDATA,
4234 (void*) (image + sections[i].offset),
4235 (void*) (image + sections[i].offset + sections[i].size));
4236 else if(!strcmp(sections[i].sectname,"__bss")
4237 || !strcmp(sections[i].sectname,"__common"))
4238 addSection(oc, SECTIONKIND_RWDATA,
4239 (void*) (image + sections[i].offset),
4240 (void*) (image + sections[i].offset + sections[i].size));
4242 addProddableBlock(oc, (void*) (image + sections[i].offset),
4246 // count external symbols defined here
4250 for(i=0;i<symLC->nsyms;i++)
4252 if(nlist[i].n_type & N_STAB)
4254 else if(nlist[i].n_type & N_EXT)
4256 if((nlist[i].n_type & N_TYPE) == N_UNDF
4257 && (nlist[i].n_value != 0))
4259 commonSize += nlist[i].n_value;
4262 else if((nlist[i].n_type & N_TYPE) == N_SECT)
4267 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
4268 "ocGetNames_MachO(oc->symbols)");
4272 for(i=0;i<symLC->nsyms;i++)
4274 if(nlist[i].n_type & N_STAB)
4276 else if((nlist[i].n_type & N_TYPE) == N_SECT)
4278 if(nlist[i].n_type & N_EXT)
4280 char *nm = image + symLC->stroff + nlist[i].n_un.n_strx;
4281 ghciInsertStrHashTable(oc->fileName, symhash, nm,
4283 + sections[nlist[i].n_sect-1].offset
4284 - sections[nlist[i].n_sect-1].addr
4285 + nlist[i].n_value);
4286 oc->symbols[curSymbol++] = nm;
4290 char *nm = image + symLC->stroff + nlist[i].n_un.n_strx;
4291 ghciInsertStrHashTable(oc->fileName, oc->lochash, nm,
4293 + sections[nlist[i].n_sect-1].offset
4294 - sections[nlist[i].n_sect-1].addr
4295 + nlist[i].n_value);
4301 commonStorage = stgCallocBytes(1,commonSize,"ocGetNames_MachO(common symbols)");
4302 commonCounter = (unsigned long)commonStorage;
4305 for(i=0;i<symLC->nsyms;i++)
4307 if((nlist[i].n_type & N_TYPE) == N_UNDF
4308 && (nlist[i].n_type & N_EXT) && (nlist[i].n_value != 0))
4310 char *nm = image + symLC->stroff + nlist[i].n_un.n_strx;
4311 unsigned long sz = nlist[i].n_value;
4313 nlist[i].n_value = commonCounter;
4315 ghciInsertStrHashTable(oc->fileName, symhash, nm,
4316 (void*)commonCounter);
4317 oc->symbols[curSymbol++] = nm;
4319 commonCounter += sz;
4326 static int ocResolve_MachO(ObjectCode* oc)
4328 char *image = (char*) oc->image;
4329 struct mach_header *header = (struct mach_header*) image;
4330 struct load_command *lc = (struct load_command*) (image + sizeof(struct mach_header));
4332 struct segment_command *segLC = NULL;
4333 struct section *sections;
4334 struct symtab_command *symLC = NULL;
4335 struct dysymtab_command *dsymLC = NULL;
4336 struct nlist *nlist;
4338 for(i=0;i<header->ncmds;i++)
4340 if(lc->cmd == LC_SEGMENT)
4341 segLC = (struct segment_command*) lc;
4342 else if(lc->cmd == LC_SYMTAB)
4343 symLC = (struct symtab_command*) lc;
4344 else if(lc->cmd == LC_DYSYMTAB)
4345 dsymLC = (struct dysymtab_command*) lc;
4346 lc = (struct load_command *) ( ((char*)lc) + lc->cmdsize );
4349 sections = (struct section*) (segLC+1);
4350 nlist = symLC ? (struct nlist*) (image + symLC->symoff)
4355 unsigned long *indirectSyms
4356 = (unsigned long*) (image + dsymLC->indirectsymoff);
4358 for(i=0;i<segLC->nsects;i++)
4360 if( !strcmp(sections[i].sectname,"__la_symbol_ptr")
4361 || !strcmp(sections[i].sectname,"__la_sym_ptr2")
4362 || !strcmp(sections[i].sectname,"__la_sym_ptr3"))
4364 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4367 else if(!strcmp(sections[i].sectname,"__nl_symbol_ptr")
4368 || !strcmp(sections[i].sectname,"__pointers"))
4370 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4373 else if(!strcmp(sections[i].sectname,"__jump_table"))
4375 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4381 for(i=0;i<segLC->nsects;i++)
4383 if(!relocateSection(oc,image,symLC,nlist,segLC->nsects,sections,§ions[i]))
4387 /* Free the local symbol table; we won't need it again. */
4388 freeHashTable(oc->lochash, NULL);
4391 #if defined (powerpc_HOST_ARCH)
4392 ocFlushInstructionCache( oc );
4398 #ifdef powerpc_HOST_ARCH
4400 * The Mach-O object format uses leading underscores. But not everywhere.
4401 * There is a small number of runtime support functions defined in
4402 * libcc_dynamic.a whose name does not have a leading underscore.
4403 * As a consequence, we can't get their address from C code.
4404 * We have to use inline assembler just to take the address of a function.
4408 static void machoInitSymbolsWithoutUnderscore()
4410 extern void* symbolsWithoutUnderscore[];
4411 void **p = symbolsWithoutUnderscore;
4412 __asm__ volatile(".globl _symbolsWithoutUnderscore\n.data\n_symbolsWithoutUnderscore:");
4416 __asm__ volatile(".long " # x);
4418 RTS_MACHO_NOUNDERLINE_SYMBOLS
4420 __asm__ volatile(".text");
4424 ghciInsertStrHashTable("(GHCi built-in symbols)", symhash, #x, *p++);
4426 RTS_MACHO_NOUNDERLINE_SYMBOLS
4433 * Figure out by how much to shift the entire Mach-O file in memory
4434 * when loading so that its single segment ends up 16-byte-aligned
4436 static int machoGetMisalignment( FILE * f )
4438 struct mach_header header;
4441 fread(&header, sizeof(header), 1, f);
4444 if(header.magic != MH_MAGIC)
4447 misalignment = (header.sizeofcmds + sizeof(header))
4450 return misalignment ? (16 - misalignment) : 0;