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) \
343 RTS_MINGW_EXTRA_SYMS \
347 #if defined(darwin_TARGET_OS) && HAVE_PRINTF_LDBLSTUB
348 #define RTS_DARWIN_ONLY_SYMBOLS \
349 Sym(asprintf$LDBLStub) \
353 Sym(fprintf$LDBLStub) \
354 Sym(fscanf$LDBLStub) \
355 Sym(fwprintf$LDBLStub) \
356 Sym(fwscanf$LDBLStub) \
357 Sym(printf$LDBLStub) \
358 Sym(scanf$LDBLStub) \
359 Sym(snprintf$LDBLStub) \
360 Sym(sprintf$LDBLStub) \
361 Sym(sscanf$LDBLStub) \
362 Sym(strtold$LDBLStub) \
363 Sym(swprintf$LDBLStub) \
364 Sym(swscanf$LDBLStub) \
365 Sym(syslog$LDBLStub) \
366 Sym(vasprintf$LDBLStub) \
368 Sym(verrc$LDBLStub) \
369 Sym(verrx$LDBLStub) \
370 Sym(vfprintf$LDBLStub) \
371 Sym(vfscanf$LDBLStub) \
372 Sym(vfwprintf$LDBLStub) \
373 Sym(vfwscanf$LDBLStub) \
374 Sym(vprintf$LDBLStub) \
375 Sym(vscanf$LDBLStub) \
376 Sym(vsnprintf$LDBLStub) \
377 Sym(vsprintf$LDBLStub) \
378 Sym(vsscanf$LDBLStub) \
379 Sym(vswprintf$LDBLStub) \
380 Sym(vswscanf$LDBLStub) \
381 Sym(vsyslog$LDBLStub) \
382 Sym(vwarn$LDBLStub) \
383 Sym(vwarnc$LDBLStub) \
384 Sym(vwarnx$LDBLStub) \
385 Sym(vwprintf$LDBLStub) \
386 Sym(vwscanf$LDBLStub) \
388 Sym(warnc$LDBLStub) \
389 Sym(warnx$LDBLStub) \
390 Sym(wcstold$LDBLStub) \
391 Sym(wprintf$LDBLStub) \
394 #define RTS_DARWIN_ONLY_SYMBOLS
398 # define MAIN_CAP_SYM SymX(MainCapability)
400 # define MAIN_CAP_SYM
403 #if !defined(mingw32_HOST_OS)
404 #define RTS_USER_SIGNALS_SYMBOLS \
405 SymX(setIOManagerPipe)
407 #define RTS_USER_SIGNALS_SYMBOLS /* nothing */
410 #ifdef TABLES_NEXT_TO_CODE
411 #define RTS_RET_SYMBOLS /* nothing */
413 #define RTS_RET_SYMBOLS \
414 SymX(stg_enter_ret) \
415 SymX(stg_gc_fun_ret) \
422 SymX(stg_ap_pv_ret) \
423 SymX(stg_ap_pp_ret) \
424 SymX(stg_ap_ppv_ret) \
425 SymX(stg_ap_ppp_ret) \
426 SymX(stg_ap_pppv_ret) \
427 SymX(stg_ap_pppp_ret) \
428 SymX(stg_ap_ppppp_ret) \
429 SymX(stg_ap_pppppp_ret)
432 #define RTS_SYMBOLS \
435 SymX(stg_enter_info) \
436 SymX(stg_gc_void_info) \
437 SymX(__stg_gc_enter_1) \
438 SymX(stg_gc_noregs) \
439 SymX(stg_gc_unpt_r1_info) \
440 SymX(stg_gc_unpt_r1) \
441 SymX(stg_gc_unbx_r1_info) \
442 SymX(stg_gc_unbx_r1) \
443 SymX(stg_gc_f1_info) \
445 SymX(stg_gc_d1_info) \
447 SymX(stg_gc_l1_info) \
450 SymX(stg_gc_fun_info) \
452 SymX(stg_gc_gen_info) \
453 SymX(stg_gc_gen_hp) \
455 SymX(stg_gen_yield) \
456 SymX(stg_yield_noregs) \
457 SymX(stg_yield_to_interpreter) \
458 SymX(stg_gen_block) \
459 SymX(stg_block_noregs) \
461 SymX(stg_block_takemvar) \
462 SymX(stg_block_putmvar) \
463 SymX(stg_seq_frame_info) \
465 SymX(MallocFailHook) \
467 SymX(OutOfHeapHook) \
468 SymX(StackOverflowHook) \
469 SymX(__encodeDouble) \
470 SymX(__encodeFloat) \
474 SymX(__gmpz_cmp_si) \
475 SymX(__gmpz_cmp_ui) \
476 SymX(__gmpz_get_si) \
477 SymX(__gmpz_get_ui) \
478 SymX(__int_encodeDouble) \
479 SymX(__int_encodeFloat) \
480 SymX(andIntegerzh_fast) \
481 SymX(atomicallyzh_fast) \
485 SymX(blockAsyncExceptionszh_fast) \
487 SymX(catchRetryzh_fast) \
488 SymX(catchSTMzh_fast) \
489 SymX(closure_flags) \
491 SymX(cmpIntegerzh_fast) \
492 SymX(cmpIntegerIntzh_fast) \
493 SymX(complementIntegerzh_fast) \
494 SymX(createAdjustor) \
495 SymX(decodeDoublezh_fast) \
496 SymX(decodeFloatzh_fast) \
499 SymX(deRefWeakzh_fast) \
500 SymX(deRefStablePtrzh_fast) \
501 SymX(dirty_MUT_VAR) \
502 SymX(divExactIntegerzh_fast) \
503 SymX(divModIntegerzh_fast) \
505 SymX(forkOnzh_fast) \
507 SymX(forkOS_createThread) \
508 SymX(freeHaskellFunctionPtr) \
509 SymX(freeStablePtr) \
510 SymX(gcdIntegerzh_fast) \
511 SymX(gcdIntegerIntzh_fast) \
512 SymX(gcdIntzh_fast) \
521 SymX(hs_perform_gc) \
522 SymX(hs_free_stable_ptr) \
523 SymX(hs_free_fun_ptr) \
525 SymX(int2Integerzh_fast) \
526 SymX(integer2Intzh_fast) \
527 SymX(integer2Wordzh_fast) \
528 SymX(isCurrentThreadBoundzh_fast) \
529 SymX(isDoubleDenormalized) \
530 SymX(isDoubleInfinite) \
532 SymX(isDoubleNegativeZero) \
533 SymX(isEmptyMVarzh_fast) \
534 SymX(isFloatDenormalized) \
535 SymX(isFloatInfinite) \
537 SymX(isFloatNegativeZero) \
538 SymX(killThreadzh_fast) \
540 SymX(insertStableSymbol) \
543 SymX(makeStablePtrzh_fast) \
544 SymX(minusIntegerzh_fast) \
545 SymX(mkApUpd0zh_fast) \
546 SymX(myThreadIdzh_fast) \
547 SymX(labelThreadzh_fast) \
548 SymX(newArrayzh_fast) \
549 SymX(newBCOzh_fast) \
550 SymX(newByteArrayzh_fast) \
551 SymX_redirect(newCAF, newDynCAF) \
552 SymX(newMVarzh_fast) \
553 SymX(newMutVarzh_fast) \
554 SymX(newTVarzh_fast) \
555 SymX(atomicModifyMutVarzh_fast) \
556 SymX(newPinnedByteArrayzh_fast) \
558 SymX(orIntegerzh_fast) \
560 SymX(performMajorGC) \
561 SymX(plusIntegerzh_fast) \
564 SymX(putMVarzh_fast) \
565 SymX(quotIntegerzh_fast) \
566 SymX(quotRemIntegerzh_fast) \
568 SymX(raiseIOzh_fast) \
569 SymX(readTVarzh_fast) \
570 SymX(remIntegerzh_fast) \
571 SymX(resetNonBlockingFd) \
576 SymX(rts_checkSchedStatus) \
579 SymX(rts_evalLazyIO) \
580 SymX(rts_evalStableIO) \
584 SymX(rts_getDouble) \
589 SymX(rts_getFunPtr) \
590 SymX(rts_getStablePtr) \
591 SymX(rts_getThreadId) \
593 SymX(rts_getWord32) \
606 SymX(rts_mkStablePtr) \
614 SymX(rtsSupportsBoundThreads) \
615 SymX(__hscore_get_saved_termios) \
616 SymX(__hscore_set_saved_termios) \
618 SymX(startupHaskell) \
619 SymX(shutdownHaskell) \
620 SymX(shutdownHaskellAndExit) \
621 SymX(stable_ptr_table) \
622 SymX(stackOverflow) \
623 SymX(stg_CAF_BLACKHOLE_info) \
624 SymX(awakenBlockedQueue) \
625 SymX(stg_CHARLIKE_closure) \
626 SymX(stg_EMPTY_MVAR_info) \
627 SymX(stg_IND_STATIC_info) \
628 SymX(stg_INTLIKE_closure) \
629 SymX(stg_MUT_ARR_PTRS_DIRTY_info) \
630 SymX(stg_MUT_ARR_PTRS_FROZEN_info) \
631 SymX(stg_MUT_ARR_PTRS_FROZEN0_info) \
632 SymX(stg_WEAK_info) \
633 SymX(stg_ap_v_info) \
634 SymX(stg_ap_f_info) \
635 SymX(stg_ap_d_info) \
636 SymX(stg_ap_l_info) \
637 SymX(stg_ap_n_info) \
638 SymX(stg_ap_p_info) \
639 SymX(stg_ap_pv_info) \
640 SymX(stg_ap_pp_info) \
641 SymX(stg_ap_ppv_info) \
642 SymX(stg_ap_ppp_info) \
643 SymX(stg_ap_pppv_info) \
644 SymX(stg_ap_pppp_info) \
645 SymX(stg_ap_ppppp_info) \
646 SymX(stg_ap_pppppp_info) \
647 SymX(stg_ap_0_fast) \
648 SymX(stg_ap_v_fast) \
649 SymX(stg_ap_f_fast) \
650 SymX(stg_ap_d_fast) \
651 SymX(stg_ap_l_fast) \
652 SymX(stg_ap_n_fast) \
653 SymX(stg_ap_p_fast) \
654 SymX(stg_ap_pv_fast) \
655 SymX(stg_ap_pp_fast) \
656 SymX(stg_ap_ppv_fast) \
657 SymX(stg_ap_ppp_fast) \
658 SymX(stg_ap_pppv_fast) \
659 SymX(stg_ap_pppp_fast) \
660 SymX(stg_ap_ppppp_fast) \
661 SymX(stg_ap_pppppp_fast) \
662 SymX(stg_ap_1_upd_info) \
663 SymX(stg_ap_2_upd_info) \
664 SymX(stg_ap_3_upd_info) \
665 SymX(stg_ap_4_upd_info) \
666 SymX(stg_ap_5_upd_info) \
667 SymX(stg_ap_6_upd_info) \
668 SymX(stg_ap_7_upd_info) \
670 SymX(stg_sel_0_upd_info) \
671 SymX(stg_sel_10_upd_info) \
672 SymX(stg_sel_11_upd_info) \
673 SymX(stg_sel_12_upd_info) \
674 SymX(stg_sel_13_upd_info) \
675 SymX(stg_sel_14_upd_info) \
676 SymX(stg_sel_15_upd_info) \
677 SymX(stg_sel_1_upd_info) \
678 SymX(stg_sel_2_upd_info) \
679 SymX(stg_sel_3_upd_info) \
680 SymX(stg_sel_4_upd_info) \
681 SymX(stg_sel_5_upd_info) \
682 SymX(stg_sel_6_upd_info) \
683 SymX(stg_sel_7_upd_info) \
684 SymX(stg_sel_8_upd_info) \
685 SymX(stg_sel_9_upd_info) \
686 SymX(stg_upd_frame_info) \
687 SymX(suspendThread) \
688 SymX(takeMVarzh_fast) \
689 SymX(timesIntegerzh_fast) \
690 SymX(tryPutMVarzh_fast) \
691 SymX(tryTakeMVarzh_fast) \
692 SymX(unblockAsyncExceptionszh_fast) \
694 SymX(unsafeThawArrayzh_fast) \
695 SymX(waitReadzh_fast) \
696 SymX(waitWritezh_fast) \
697 SymX(word2Integerzh_fast) \
698 SymX(writeTVarzh_fast) \
699 SymX(xorIntegerzh_fast) \
701 SymX(stg_interp_constr_entry) \
702 SymX(stg_interp_constr1_entry) \
703 SymX(stg_interp_constr2_entry) \
704 SymX(stg_interp_constr3_entry) \
705 SymX(stg_interp_constr4_entry) \
706 SymX(stg_interp_constr5_entry) \
707 SymX(stg_interp_constr6_entry) \
708 SymX(stg_interp_constr7_entry) \
709 SymX(stg_interp_constr8_entry) \
712 SymX(getAllocations) \
715 RTS_USER_SIGNALS_SYMBOLS
717 #ifdef SUPPORT_LONG_LONGS
718 #define RTS_LONG_LONG_SYMS \
719 SymX(int64ToIntegerzh_fast) \
720 SymX(word64ToIntegerzh_fast)
722 #define RTS_LONG_LONG_SYMS /* nothing */
725 // 64-bit support functions in libgcc.a
726 #if defined(__GNUC__) && SIZEOF_VOID_P <= 4
727 #define RTS_LIBGCC_SYMBOLS \
737 #elif defined(ia64_HOST_ARCH)
738 #define RTS_LIBGCC_SYMBOLS \
746 #define RTS_LIBGCC_SYMBOLS
749 #if defined(darwin_HOST_OS) && defined(powerpc_HOST_ARCH)
750 // Symbols that don't have a leading underscore
751 // on Mac OS X. They have to receive special treatment,
752 // see machoInitSymbolsWithoutUnderscore()
753 #define RTS_MACHO_NOUNDERLINE_SYMBOLS \
758 /* entirely bogus claims about types of these symbols */
759 #define Sym(vvv) extern void vvv(void);
760 #define SymX(vvv) /**/
761 #define SymX_redirect(vvv,xxx) /**/
765 RTS_POSIX_ONLY_SYMBOLS
766 RTS_MINGW_ONLY_SYMBOLS
767 RTS_CYGWIN_ONLY_SYMBOLS
768 RTS_DARWIN_ONLY_SYMBOLS
774 #ifdef LEADING_UNDERSCORE
775 #define MAYBE_LEADING_UNDERSCORE_STR(s) ("_" s)
777 #define MAYBE_LEADING_UNDERSCORE_STR(s) (s)
780 #define Sym(vvv) { MAYBE_LEADING_UNDERSCORE_STR(#vvv), \
782 #define SymX(vvv) Sym(vvv)
784 // SymX_redirect allows us to redirect references to one symbol to
785 // another symbol. See newCAF/newDynCAF for an example.
786 #define SymX_redirect(vvv,xxx) \
787 { MAYBE_LEADING_UNDERSCORE_STR(#vvv), \
790 static RtsSymbolVal rtsSyms[] = {
794 RTS_POSIX_ONLY_SYMBOLS
795 RTS_MINGW_ONLY_SYMBOLS
796 RTS_CYGWIN_ONLY_SYMBOLS
798 #if defined(darwin_HOST_OS) && defined(i386_HOST_ARCH)
799 // dyld stub code contains references to this,
800 // but it should never be called because we treat
801 // lazy pointers as nonlazy.
802 { "dyld_stub_binding_helper", (void*)0xDEADBEEF },
804 { 0, 0 } /* sentinel */
808 /* -----------------------------------------------------------------------------
809 * Utilities for handling root pointers.
810 * -------------------------------------------------------------------------- */
813 #define INIT_RPT_SIZE 64
816 initFreeList(rootEntry *table, nat n, rootEntry *free)
820 for (p = table + n - 1; p >= table; p--) {
824 root_ptr_free = table;
828 initRootPtrTable(void)
833 RPT_size = INIT_RPT_SIZE;
834 root_ptr_table = stgMallocBytes(RPT_size * sizeof(rootEntry),
837 initFreeList(root_ptr_table,INIT_RPT_SIZE,NULL);
842 enlargeRootPtrTable(void)
844 nat old_RPT_size = RPT_size;
846 // 2nd and subsequent times
849 stgReallocBytes(root_ptr_table,
850 RPT_size * sizeof(rootEntry),
851 "enlargeRootPtrTable");
853 initFreeList(root_ptr_table + old_RPT_size, old_RPT_size, NULL);
857 addRootObject(void *addr)
861 if (root_ptr_free == NULL) {
862 enlargeRootPtrTable();
865 rt = root_ptr_free - root_ptr_table;
866 root_ptr_free = (rootEntry*)(root_ptr_free->addr);
867 root_ptr_table[rt].addr = addr;
870 /* -----------------------------------------------------------------------------
871 * Treat root pointers as roots for the garbage collector.
872 * -------------------------------------------------------------------------- */
875 markRootPtrTable(evac_fn evac)
877 rootEntry *p, *end_root_ptr_table;
880 end_root_ptr_table = &root_ptr_table[RPT_size];
882 for (p = root_ptr_table; p < end_root_ptr_table; p++) {
885 if (q && (q < (P_)root_ptr_table || q >= (P_)end_root_ptr_table)) {
886 evac((StgClosure **)p->addr);
891 /* -----------------------------------------------------------------------------
892 * End of utilities for handling root pointers.
893 * -------------------------------------------------------------------------- */
896 /* -----------------------------------------------------------------------------
897 * Insert symbols into hash tables, checking for duplicates.
899 static void ghciInsertStrHashTable ( char* obj_name,
905 if (lookupHashTable(table, (StgWord)key) == NULL)
907 insertStrHashTable(table, (StgWord)key, data);
912 "GHCi runtime linker: fatal error: I found a duplicate definition for symbol\n"
914 "whilst processing object file\n"
916 "This could be caused by:\n"
917 " * Loading two different object files which export the same symbol\n"
918 " * Specifying the same object file twice on the GHCi command line\n"
919 " * An incorrect `package.conf' entry, causing some object to be\n"
921 "GHCi cannot safely continue in this situation. Exiting now. Sorry.\n"
930 /* -----------------------------------------------------------------------------
931 * initialize the object linker
935 static int linker_init_done = 0 ;
937 #if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
938 static void *dl_prog_handle;
941 /* dlopen(NULL,..) doesn't work so we grab libc explicitly */
942 #if defined(openbsd_HOST_OS)
943 static void *dl_libc_handle;
951 /* Make initLinker idempotent, so we can call it
952 before evey relevant operation; that means we
953 don't need to initialise the linker separately */
954 if (linker_init_done == 1) { return; } else {
955 linker_init_done = 1;
958 stablehash = allocStrHashTable();
959 symhash = allocStrHashTable();
961 /* populate the symbol table with stuff from the RTS */
962 for (sym = rtsSyms; sym->lbl != NULL; sym++) {
963 ghciInsertStrHashTable("(GHCi built-in symbols)",
964 symhash, sym->lbl, sym->addr);
966 # if defined(OBJFORMAT_MACHO) && defined(powerpc_HOST_ARCH)
967 machoInitSymbolsWithoutUnderscore();
970 # if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
971 # if defined(RTLD_DEFAULT)
972 dl_prog_handle = RTLD_DEFAULT;
974 dl_prog_handle = dlopen(NULL, RTLD_LAZY);
975 # if defined(openbsd_HOST_OS)
976 dl_libc_handle = dlopen("libc.so", RTLD_LAZY);
978 # endif /* RTLD_DEFAULT */
982 /* -----------------------------------------------------------------------------
983 * Loading DLL or .so dynamic libraries
984 * -----------------------------------------------------------------------------
986 * Add a DLL from which symbols may be found. In the ELF case, just
987 * do RTLD_GLOBAL-style add, so no further messing around needs to
988 * happen in order that symbols in the loaded .so are findable --
989 * lookupSymbol() will subsequently see them by dlsym on the program's
990 * dl-handle. Returns NULL if success, otherwise ptr to an err msg.
992 * In the PEi386 case, open the DLLs and put handles to them in a
993 * linked list. When looking for a symbol, try all handles in the
994 * list. This means that we need to load even DLLs that are guaranteed
995 * to be in the ghc.exe image already, just so we can get a handle
996 * to give to loadSymbol, so that we can find the symbols. For such
997 * libraries, the LoadLibrary call should be a no-op except for returning
1002 #if defined(OBJFORMAT_PEi386)
1003 /* A record for storing handles into DLLs. */
1008 struct _OpenedDLL* next;
1013 /* A list thereof. */
1014 static OpenedDLL* opened_dlls = NULL;
1018 addDLL( char *dll_name )
1020 # if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
1021 /* ------------------- ELF DLL loader ------------------- */
1027 hdl= dlopen(dll_name, RTLD_NOW | RTLD_GLOBAL);
1030 /* dlopen failed; return a ptr to the error msg. */
1032 if (errmsg == NULL) errmsg = "addDLL: unknown error";
1039 # elif defined(OBJFORMAT_PEi386)
1040 /* ------------------- Win32 DLL loader ------------------- */
1048 /* debugBelch("\naddDLL; dll_name = `%s'\n", dll_name); */
1050 /* See if we've already got it, and ignore if so. */
1051 for (o_dll = opened_dlls; o_dll != NULL; o_dll = o_dll->next) {
1052 if (0 == strcmp(o_dll->name, dll_name))
1056 /* The file name has no suffix (yet) so that we can try
1057 both foo.dll and foo.drv
1059 The documentation for LoadLibrary says:
1060 If no file name extension is specified in the lpFileName
1061 parameter, the default library extension .dll is
1062 appended. However, the file name string can include a trailing
1063 point character (.) to indicate that the module name has no
1066 buf = stgMallocBytes(strlen(dll_name) + 10, "addDLL");
1067 sprintf(buf, "%s.DLL", dll_name);
1068 instance = LoadLibrary(buf);
1069 if (instance == NULL) {
1070 sprintf(buf, "%s.DRV", dll_name); // KAA: allow loading of drivers (like winspool.drv)
1071 instance = LoadLibrary(buf);
1072 if (instance == NULL) {
1075 /* LoadLibrary failed; return a ptr to the error msg. */
1076 return "addDLL: unknown error";
1081 /* Add this DLL to the list of DLLs in which to search for symbols. */
1082 o_dll = stgMallocBytes( sizeof(OpenedDLL), "addDLL" );
1083 o_dll->name = stgMallocBytes(1+strlen(dll_name), "addDLL");
1084 strcpy(o_dll->name, dll_name);
1085 o_dll->instance = instance;
1086 o_dll->next = opened_dlls;
1087 opened_dlls = o_dll;
1091 barf("addDLL: not implemented on this platform");
1095 /* -----------------------------------------------------------------------------
1096 * insert a stable symbol in the hash table
1100 insertStableSymbol(char* obj_name, char* key, StgPtr p)
1102 ghciInsertStrHashTable(obj_name, stablehash, key, getStablePtr(p));
1106 /* -----------------------------------------------------------------------------
1107 * insert a symbol in the hash table
1110 insertSymbol(char* obj_name, char* key, void* data)
1112 ghciInsertStrHashTable(obj_name, symhash, key, data);
1115 /* -----------------------------------------------------------------------------
1116 * lookup a symbol in the hash table
1119 lookupSymbol( char *lbl )
1123 ASSERT(symhash != NULL);
1124 val = lookupStrHashTable(symhash, lbl);
1127 # if defined(OBJFORMAT_ELF)
1128 # if defined(openbsd_HOST_OS)
1129 val = dlsym(dl_prog_handle, lbl);
1130 return (val != NULL) ? val : dlsym(dl_libc_handle,lbl);
1131 # elif defined(x86_64_HOST_ARCH)
1132 val = dlsym(dl_prog_handle, lbl);
1133 if (val >= (void *)0x80000000) {
1135 new_val = x86_64_high_symbol(lbl, val);
1136 IF_DEBUG(linker,debugBelch("lookupSymbol: relocating out of range symbol: %s = %p, now %p\n", lbl, val, new_val));
1141 # else /* not openbsd */
1142 return dlsym(dl_prog_handle, lbl);
1144 # elif defined(OBJFORMAT_MACHO)
1145 if(NSIsSymbolNameDefined(lbl)) {
1146 NSSymbol symbol = NSLookupAndBindSymbol(lbl);
1147 return NSAddressOfSymbol(symbol);
1151 # elif defined(OBJFORMAT_PEi386)
1154 for (o_dll = opened_dlls; o_dll != NULL; o_dll = o_dll->next) {
1155 /* debugBelch("look in %s for %s\n", o_dll->name, lbl); */
1156 if (lbl[0] == '_') {
1157 /* HACK: if the name has an initial underscore, try stripping
1158 it off & look that up first. I've yet to verify whether there's
1159 a Rule that governs whether an initial '_' *should always* be
1160 stripped off when mapping from import lib name to the DLL name.
1162 sym = GetProcAddress(o_dll->instance, (lbl+1));
1164 /*debugBelch("found %s in %s\n", lbl+1,o_dll->name);*/
1168 sym = GetProcAddress(o_dll->instance, lbl);
1170 /*debugBelch("found %s in %s\n", lbl,o_dll->name);*/
1185 __attribute((unused))
1187 lookupLocalSymbol( ObjectCode* oc, char *lbl )
1191 val = lookupStrHashTable(oc->lochash, lbl);
1201 /* -----------------------------------------------------------------------------
1202 * Debugging aid: look in GHCi's object symbol tables for symbols
1203 * within DELTA bytes of the specified address, and show their names.
1206 void ghci_enquire ( char* addr );
1208 void ghci_enquire ( char* addr )
1213 const int DELTA = 64;
1218 for (oc = objects; oc; oc = oc->next) {
1219 for (i = 0; i < oc->n_symbols; i++) {
1220 sym = oc->symbols[i];
1221 if (sym == NULL) continue;
1222 // debugBelch("enquire %p %p\n", sym, oc->lochash);
1224 if (oc->lochash != NULL) {
1225 a = lookupStrHashTable(oc->lochash, sym);
1228 a = lookupStrHashTable(symhash, sym);
1231 // debugBelch("ghci_enquire: can't find %s\n", sym);
1233 else if (addr-DELTA <= a && a <= addr+DELTA) {
1234 debugBelch("%p + %3d == `%s'\n", addr, (int)(a - addr), sym);
1241 #ifdef ia64_HOST_ARCH
1242 static unsigned int PLTSize(void);
1245 /* -----------------------------------------------------------------------------
1246 * Load an obj (populate the global symbol table, but don't resolve yet)
1248 * Returns: 1 if ok, 0 on error.
1251 loadObj( char *path )
1258 void *map_addr = NULL;
1265 /* debugBelch("loadObj %s\n", path ); */
1267 /* Check that we haven't already loaded this object.
1268 Ignore requests to load multiple times */
1272 for (o = objects; o; o = o->next) {
1273 if (0 == strcmp(o->fileName, path)) {
1275 break; /* don't need to search further */
1279 IF_DEBUG(linker, debugBelch(
1280 "GHCi runtime linker: warning: looks like you're trying to load the\n"
1281 "same object file twice:\n"
1283 "GHCi will ignore this, but be warned.\n"
1285 return 1; /* success */
1289 oc = stgMallocBytes(sizeof(ObjectCode), "loadObj(oc)");
1291 # if defined(OBJFORMAT_ELF)
1292 oc->formatName = "ELF";
1293 # elif defined(OBJFORMAT_PEi386)
1294 oc->formatName = "PEi386";
1295 # elif defined(OBJFORMAT_MACHO)
1296 oc->formatName = "Mach-O";
1299 barf("loadObj: not implemented on this platform");
1302 r = stat(path, &st);
1303 if (r == -1) { return 0; }
1305 /* sigh, strdup() isn't a POSIX function, so do it the long way */
1306 oc->fileName = stgMallocBytes( strlen(path)+1, "loadObj" );
1307 strcpy(oc->fileName, path);
1309 oc->fileSize = st.st_size;
1311 oc->sections = NULL;
1312 oc->lochash = allocStrHashTable();
1313 oc->proddables = NULL;
1315 /* chain it onto the list of objects */
1320 #define ROUND_UP(x,size) ((x + size - 1) & ~(size - 1))
1322 /* On many architectures malloc'd memory isn't executable, so we need to use mmap. */
1324 #if defined(openbsd_HOST_OS)
1325 fd = open(path, O_RDONLY, S_IRUSR);
1327 fd = open(path, O_RDONLY);
1330 barf("loadObj: can't open `%s'", path);
1332 pagesize = getpagesize();
1334 #ifdef ia64_HOST_ARCH
1335 /* The PLT needs to be right before the object */
1336 n = ROUND_UP(PLTSize(), pagesize);
1337 oc->plt = mmap(NULL, n, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
1338 if (oc->plt == MAP_FAILED)
1339 barf("loadObj: can't allocate PLT");
1342 map_addr = oc->plt + n;
1345 n = ROUND_UP(oc->fileSize, pagesize);
1347 /* Link objects into the lower 2Gb on x86_64. GHC assumes the
1348 * small memory model on this architecture (see gcc docs,
1351 #ifdef x86_64_HOST_ARCH
1352 #define EXTRA_MAP_FLAGS MAP_32BIT
1354 #define EXTRA_MAP_FLAGS 0
1357 oc->image = mmap(map_addr, n, PROT_EXEC|PROT_READ|PROT_WRITE,
1358 MAP_PRIVATE|EXTRA_MAP_FLAGS, fd, 0);
1359 if (oc->image == MAP_FAILED)
1360 barf("loadObj: can't map `%s'", path);
1364 #else /* !USE_MMAP */
1366 /* load the image into memory */
1367 f = fopen(path, "rb");
1369 barf("loadObj: can't read `%s'", path);
1371 #ifdef darwin_HOST_OS
1372 // In a Mach-O .o file, all sections can and will be misaligned
1373 // if the total size of the headers is not a multiple of the
1374 // desired alignment. This is fine for .o files that only serve
1375 // as input for the static linker, but it's not fine for us,
1376 // as SSE (used by gcc for floating point) and Altivec require
1377 // 16-byte alignment.
1378 // We calculate the correct alignment from the header before
1379 // reading the file, and then we misalign oc->image on purpose so
1380 // that the actual sections end up aligned again.
1381 misalignment = machoGetMisalignment(f);
1382 oc->misalignment = misalignment;
1387 oc->image = stgMallocBytes(oc->fileSize + misalignment, "loadObj(image)");
1388 oc->image += misalignment;
1390 n = fread ( oc->image, 1, oc->fileSize, f );
1391 if (n != oc->fileSize)
1392 barf("loadObj: error whilst reading `%s'", path);
1396 #endif /* USE_MMAP */
1398 # if defined(OBJFORMAT_MACHO) && defined(powerpc_HOST_ARCH)
1399 r = ocAllocateJumpIslands_MachO ( oc );
1400 if (!r) { return r; }
1401 # elif defined(OBJFORMAT_ELF) && defined(powerpc_HOST_ARCH)
1402 r = ocAllocateJumpIslands_ELF ( oc );
1403 if (!r) { return r; }
1406 /* verify the in-memory image */
1407 # if defined(OBJFORMAT_ELF)
1408 r = ocVerifyImage_ELF ( oc );
1409 # elif defined(OBJFORMAT_PEi386)
1410 r = ocVerifyImage_PEi386 ( oc );
1411 # elif defined(OBJFORMAT_MACHO)
1412 r = ocVerifyImage_MachO ( oc );
1414 barf("loadObj: no verify method");
1416 if (!r) { return r; }
1418 /* build the symbol list for this image */
1419 # if defined(OBJFORMAT_ELF)
1420 r = ocGetNames_ELF ( oc );
1421 # elif defined(OBJFORMAT_PEi386)
1422 r = ocGetNames_PEi386 ( oc );
1423 # elif defined(OBJFORMAT_MACHO)
1424 r = ocGetNames_MachO ( oc );
1426 barf("loadObj: no getNames method");
1428 if (!r) { return r; }
1430 /* loaded, but not resolved yet */
1431 oc->status = OBJECT_LOADED;
1436 /* -----------------------------------------------------------------------------
1437 * resolve all the currently unlinked objects in memory
1439 * Returns: 1 if ok, 0 on error.
1449 for (oc = objects; oc; oc = oc->next) {
1450 if (oc->status != OBJECT_RESOLVED) {
1451 # if defined(OBJFORMAT_ELF)
1452 r = ocResolve_ELF ( oc );
1453 # elif defined(OBJFORMAT_PEi386)
1454 r = ocResolve_PEi386 ( oc );
1455 # elif defined(OBJFORMAT_MACHO)
1456 r = ocResolve_MachO ( oc );
1458 barf("resolveObjs: not implemented on this platform");
1460 if (!r) { return r; }
1461 oc->status = OBJECT_RESOLVED;
1467 /* -----------------------------------------------------------------------------
1468 * delete an object from the pool
1471 unloadObj( char *path )
1473 ObjectCode *oc, *prev;
1475 ASSERT(symhash != NULL);
1476 ASSERT(objects != NULL);
1481 for (oc = objects; oc; prev = oc, oc = oc->next) {
1482 if (!strcmp(oc->fileName,path)) {
1484 /* Remove all the mappings for the symbols within this
1489 for (i = 0; i < oc->n_symbols; i++) {
1490 if (oc->symbols[i] != NULL) {
1491 removeStrHashTable(symhash, oc->symbols[i], NULL);
1499 prev->next = oc->next;
1502 /* We're going to leave this in place, in case there are
1503 any pointers from the heap into it: */
1504 /* stgFree(oc->image); */
1505 stgFree(oc->fileName);
1506 stgFree(oc->symbols);
1507 stgFree(oc->sections);
1508 /* The local hash table should have been freed at the end
1509 of the ocResolve_ call on it. */
1510 ASSERT(oc->lochash == NULL);
1516 errorBelch("unloadObj: can't find `%s' to unload", path);
1520 /* -----------------------------------------------------------------------------
1521 * Sanity checking. For each ObjectCode, maintain a list of address ranges
1522 * which may be prodded during relocation, and abort if we try and write
1523 * outside any of these.
1525 static void addProddableBlock ( ObjectCode* oc, void* start, int size )
1528 = stgMallocBytes(sizeof(ProddableBlock), "addProddableBlock");
1529 /* debugBelch("aPB %p %p %d\n", oc, start, size); */
1533 pb->next = oc->proddables;
1534 oc->proddables = pb;
1537 static void checkProddableBlock ( ObjectCode* oc, void* addr )
1540 for (pb = oc->proddables; pb != NULL; pb = pb->next) {
1541 char* s = (char*)(pb->start);
1542 char* e = s + pb->size - 1;
1543 char* a = (char*)addr;
1544 /* Assumes that the biggest fixup involves a 4-byte write. This
1545 probably needs to be changed to 8 (ie, +7) on 64-bit
1547 if (a >= s && (a+3) <= e) return;
1549 barf("checkProddableBlock: invalid fixup in runtime linker");
1552 /* -----------------------------------------------------------------------------
1553 * Section management.
1555 static void addSection ( ObjectCode* oc, SectionKind kind,
1556 void* start, void* end )
1558 Section* s = stgMallocBytes(sizeof(Section), "addSection");
1562 s->next = oc->sections;
1565 debugBelch("addSection: %p-%p (size %d), kind %d\n",
1566 start, ((char*)end)-1, end - start + 1, kind );
1571 /* --------------------------------------------------------------------------
1572 * PowerPC specifics (jump islands)
1573 * ------------------------------------------------------------------------*/
1575 #if defined(powerpc_HOST_ARCH)
1578 ocAllocateJumpIslands
1580 Allocate additional space at the end of the object file image to make room
1583 PowerPC relative branch instructions have a 24 bit displacement field.
1584 As PPC code is always 4-byte-aligned, this yields a +-32MB range.
1585 If a particular imported symbol is outside this range, we have to redirect
1586 the jump to a short piece of new code that just loads the 32bit absolute
1587 address and jumps there.
1588 This function just allocates space for one 16 byte ppcJumpIsland for every
1589 undefined symbol in the object file. The code for the islands is filled in by
1590 makeJumpIsland below.
1593 static int ocAllocateJumpIslands( ObjectCode* oc, int count, int first )
1599 int misalignment = 0;
1601 misalignment = oc->misalignment;
1606 // round up to the nearest 4
1607 aligned = (oc->fileSize + 3) & ~3;
1610 #ifndef linux_HOST_OS /* mremap is a linux extension */
1611 #error ocAllocateJumpIslands doesnt want USE_MMAP to be defined
1614 pagesize = getpagesize();
1615 n = ROUND_UP( oc->fileSize, pagesize );
1616 m = ROUND_UP( aligned + sizeof (ppcJumpIsland) * count, pagesize );
1618 /* If we have a half-page-size file and map one page of it then
1619 * the part of the page after the size of the file remains accessible.
1620 * If, however, we map in 2 pages, the 2nd page is not accessible
1621 * and will give a "Bus Error" on access. To get around this, we check
1622 * if we need any extra pages for the jump islands and map them in
1623 * anonymously. We must check that we actually require extra pages
1624 * otherwise the attempt to mmap 0 pages of anonymous memory will
1630 /* The effect of this mremap() call is only the ensure that we have
1631 * a sufficient number of virtually contiguous pages. As returned from
1632 * mremap, the pages past the end of the file are not backed. We give
1633 * them a backing by using MAP_FIXED to map in anonymous pages.
1635 oc->image = mremap( oc->image, n, m, MREMAP_MAYMOVE );
1637 if( oc->image == MAP_FAILED )
1639 errorBelch( "Unable to mremap for Jump Islands\n" );
1643 if( mmap( oc->image + n, m - n, PROT_READ | PROT_WRITE | PROT_EXEC,
1644 MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED, 0, 0 ) == MAP_FAILED )
1646 errorBelch( "Unable to mmap( MAP_FIXED ) for Jump Islands\n" );
1652 oc->image -= misalignment;
1653 oc->image = stgReallocBytes( oc->image,
1655 aligned + sizeof (ppcJumpIsland) * count,
1656 "ocAllocateJumpIslands" );
1657 oc->image += misalignment;
1658 #endif /* USE_MMAP */
1660 oc->jump_islands = (ppcJumpIsland *) (oc->image + aligned);
1661 memset( oc->jump_islands, 0, sizeof (ppcJumpIsland) * count );
1664 oc->jump_islands = NULL;
1666 oc->island_start_symbol = first;
1667 oc->n_islands = count;
1672 static unsigned long makeJumpIsland( ObjectCode* oc,
1673 unsigned long symbolNumber,
1674 unsigned long target )
1676 ppcJumpIsland *island;
1678 if( symbolNumber < oc->island_start_symbol ||
1679 symbolNumber - oc->island_start_symbol > oc->n_islands)
1682 island = &oc->jump_islands[symbolNumber - oc->island_start_symbol];
1684 // lis r12, hi16(target)
1685 island->lis_r12 = 0x3d80;
1686 island->hi_addr = target >> 16;
1688 // ori r12, r12, lo16(target)
1689 island->ori_r12_r12 = 0x618c;
1690 island->lo_addr = target & 0xffff;
1693 island->mtctr_r12 = 0x7d8903a6;
1696 island->bctr = 0x4e800420;
1698 return (unsigned long) island;
1702 ocFlushInstructionCache
1704 Flush the data & instruction caches.
1705 Because the PPC has split data/instruction caches, we have to
1706 do that whenever we modify code at runtime.
1709 static void ocFlushInstructionCache( ObjectCode *oc )
1711 int n = (oc->fileSize + sizeof( ppcJumpIsland ) * oc->n_islands + 3) / 4;
1712 unsigned long *p = (unsigned long *) oc->image;
1716 __asm__ volatile ( "dcbf 0,%0\n\t"
1724 __asm__ volatile ( "sync\n\t"
1730 /* --------------------------------------------------------------------------
1731 * PEi386 specifics (Win32 targets)
1732 * ------------------------------------------------------------------------*/
1734 /* The information for this linker comes from
1735 Microsoft Portable Executable
1736 and Common Object File Format Specification
1737 revision 5.1 January 1998
1738 which SimonM says comes from the MS Developer Network CDs.
1740 It can be found there (on older CDs), but can also be found
1743 http://www.microsoft.com/hwdev/hardware/PECOFF.asp
1745 (this is Rev 6.0 from February 1999).
1747 Things move, so if that fails, try searching for it via
1749 http://www.google.com/search?q=PE+COFF+specification
1751 The ultimate reference for the PE format is the Winnt.h
1752 header file that comes with the Platform SDKs; as always,
1753 implementations will drift wrt their documentation.
1755 A good background article on the PE format is Matt Pietrek's
1756 March 1994 article in Microsoft System Journal (MSJ)
1757 (Vol.9, No. 3): "Peering Inside the PE: A Tour of the
1758 Win32 Portable Executable File Format." The info in there
1759 has recently been updated in a two part article in
1760 MSDN magazine, issues Feb and March 2002,
1761 "Inside Windows: An In-Depth Look into the Win32 Portable
1762 Executable File Format"
1764 John Levine's book "Linkers and Loaders" contains useful
1769 #if defined(OBJFORMAT_PEi386)
1773 typedef unsigned char UChar;
1774 typedef unsigned short UInt16;
1775 typedef unsigned int UInt32;
1782 UInt16 NumberOfSections;
1783 UInt32 TimeDateStamp;
1784 UInt32 PointerToSymbolTable;
1785 UInt32 NumberOfSymbols;
1786 UInt16 SizeOfOptionalHeader;
1787 UInt16 Characteristics;
1791 #define sizeof_COFF_header 20
1798 UInt32 VirtualAddress;
1799 UInt32 SizeOfRawData;
1800 UInt32 PointerToRawData;
1801 UInt32 PointerToRelocations;
1802 UInt32 PointerToLinenumbers;
1803 UInt16 NumberOfRelocations;
1804 UInt16 NumberOfLineNumbers;
1805 UInt32 Characteristics;
1809 #define sizeof_COFF_section 40
1816 UInt16 SectionNumber;
1819 UChar NumberOfAuxSymbols;
1823 #define sizeof_COFF_symbol 18
1828 UInt32 VirtualAddress;
1829 UInt32 SymbolTableIndex;
1834 #define sizeof_COFF_reloc 10
1837 /* From PE spec doc, section 3.3.2 */
1838 /* Note use of MYIMAGE_* since IMAGE_* are already defined in
1839 windows.h -- for the same purpose, but I want to know what I'm
1841 #define MYIMAGE_FILE_RELOCS_STRIPPED 0x0001
1842 #define MYIMAGE_FILE_EXECUTABLE_IMAGE 0x0002
1843 #define MYIMAGE_FILE_DLL 0x2000
1844 #define MYIMAGE_FILE_SYSTEM 0x1000
1845 #define MYIMAGE_FILE_BYTES_REVERSED_HI 0x8000
1846 #define MYIMAGE_FILE_BYTES_REVERSED_LO 0x0080
1847 #define MYIMAGE_FILE_32BIT_MACHINE 0x0100
1849 /* From PE spec doc, section 5.4.2 and 5.4.4 */
1850 #define MYIMAGE_SYM_CLASS_EXTERNAL 2
1851 #define MYIMAGE_SYM_CLASS_STATIC 3
1852 #define MYIMAGE_SYM_UNDEFINED 0
1854 /* From PE spec doc, section 4.1 */
1855 #define MYIMAGE_SCN_CNT_CODE 0x00000020
1856 #define MYIMAGE_SCN_CNT_INITIALIZED_DATA 0x00000040
1857 #define MYIMAGE_SCN_LNK_NRELOC_OVFL 0x01000000
1859 /* From PE spec doc, section 5.2.1 */
1860 #define MYIMAGE_REL_I386_DIR32 0x0006
1861 #define MYIMAGE_REL_I386_REL32 0x0014
1864 /* We use myindex to calculate array addresses, rather than
1865 simply doing the normal subscript thing. That's because
1866 some of the above structs have sizes which are not
1867 a whole number of words. GCC rounds their sizes up to a
1868 whole number of words, which means that the address calcs
1869 arising from using normal C indexing or pointer arithmetic
1870 are just plain wrong. Sigh.
1873 myindex ( int scale, void* base, int index )
1876 ((UChar*)base) + scale * index;
1881 printName ( UChar* name, UChar* strtab )
1883 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
1884 UInt32 strtab_offset = * (UInt32*)(name+4);
1885 debugBelch("%s", strtab + strtab_offset );
1888 for (i = 0; i < 8; i++) {
1889 if (name[i] == 0) break;
1890 debugBelch("%c", name[i] );
1897 copyName ( UChar* name, UChar* strtab, UChar* dst, int dstSize )
1899 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
1900 UInt32 strtab_offset = * (UInt32*)(name+4);
1901 strncpy ( dst, strtab+strtab_offset, dstSize );
1907 if (name[i] == 0) break;
1917 cstring_from_COFF_symbol_name ( UChar* name, UChar* strtab )
1920 /* If the string is longer than 8 bytes, look in the
1921 string table for it -- this will be correctly zero terminated.
1923 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
1924 UInt32 strtab_offset = * (UInt32*)(name+4);
1925 return ((UChar*)strtab) + strtab_offset;
1927 /* Otherwise, if shorter than 8 bytes, return the original,
1928 which by defn is correctly terminated.
1930 if (name[7]==0) return name;
1931 /* The annoying case: 8 bytes. Copy into a temporary
1932 (which is never freed ...)
1934 newstr = stgMallocBytes(9, "cstring_from_COFF_symbol_name");
1936 strncpy(newstr,name,8);
1942 /* Just compares the short names (first 8 chars) */
1943 static COFF_section *
1944 findPEi386SectionCalled ( ObjectCode* oc, char* name )
1948 = (COFF_header*)(oc->image);
1949 COFF_section* sectab
1951 ((UChar*)(oc->image))
1952 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
1954 for (i = 0; i < hdr->NumberOfSections; i++) {
1957 COFF_section* section_i
1959 myindex ( sizeof_COFF_section, sectab, i );
1960 n1 = (UChar*) &(section_i->Name);
1962 if (n1[0]==n2[0] && n1[1]==n2[1] && n1[2]==n2[2] &&
1963 n1[3]==n2[3] && n1[4]==n2[4] && n1[5]==n2[5] &&
1964 n1[6]==n2[6] && n1[7]==n2[7])
1973 zapTrailingAtSign ( UChar* sym )
1975 # define my_isdigit(c) ((c) >= '0' && (c) <= '9')
1977 if (sym[0] == 0) return;
1979 while (sym[i] != 0) i++;
1982 while (j > 0 && my_isdigit(sym[j])) j--;
1983 if (j > 0 && sym[j] == '@' && j != i) sym[j] = 0;
1989 ocVerifyImage_PEi386 ( ObjectCode* oc )
1994 COFF_section* sectab;
1995 COFF_symbol* symtab;
1997 /* debugBelch("\nLOADING %s\n", oc->fileName); */
1998 hdr = (COFF_header*)(oc->image);
1999 sectab = (COFF_section*) (
2000 ((UChar*)(oc->image))
2001 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2003 symtab = (COFF_symbol*) (
2004 ((UChar*)(oc->image))
2005 + hdr->PointerToSymbolTable
2007 strtab = ((UChar*)symtab)
2008 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
2010 if (hdr->Machine != 0x14c) {
2011 errorBelch("%s: Not x86 PEi386", oc->fileName);
2014 if (hdr->SizeOfOptionalHeader != 0) {
2015 errorBelch("%s: PEi386 with nonempty optional header", oc->fileName);
2018 if ( /* (hdr->Characteristics & MYIMAGE_FILE_RELOCS_STRIPPED) || */
2019 (hdr->Characteristics & MYIMAGE_FILE_EXECUTABLE_IMAGE) ||
2020 (hdr->Characteristics & MYIMAGE_FILE_DLL) ||
2021 (hdr->Characteristics & MYIMAGE_FILE_SYSTEM) ) {
2022 errorBelch("%s: Not a PEi386 object file", oc->fileName);
2025 if ( (hdr->Characteristics & MYIMAGE_FILE_BYTES_REVERSED_HI)
2026 /* || !(hdr->Characteristics & MYIMAGE_FILE_32BIT_MACHINE) */ ) {
2027 errorBelch("%s: Invalid PEi386 word size or endiannness: %d",
2029 (int)(hdr->Characteristics));
2032 /* If the string table size is way crazy, this might indicate that
2033 there are more than 64k relocations, despite claims to the
2034 contrary. Hence this test. */
2035 /* debugBelch("strtab size %d\n", * (UInt32*)strtab); */
2037 if ( (*(UInt32*)strtab) > 600000 ) {
2038 /* Note that 600k has no special significance other than being
2039 big enough to handle the almost-2MB-sized lumps that
2040 constitute HSwin32*.o. */
2041 debugBelch("PEi386 object has suspiciously large string table; > 64k relocs?");
2046 /* No further verification after this point; only debug printing. */
2048 IF_DEBUG(linker, i=1);
2049 if (i == 0) return 1;
2051 debugBelch( "sectab offset = %d\n", ((UChar*)sectab) - ((UChar*)hdr) );
2052 debugBelch( "symtab offset = %d\n", ((UChar*)symtab) - ((UChar*)hdr) );
2053 debugBelch( "strtab offset = %d\n", ((UChar*)strtab) - ((UChar*)hdr) );
2056 debugBelch( "Machine: 0x%x\n", (UInt32)(hdr->Machine) );
2057 debugBelch( "# sections: %d\n", (UInt32)(hdr->NumberOfSections) );
2058 debugBelch( "time/date: 0x%x\n", (UInt32)(hdr->TimeDateStamp) );
2059 debugBelch( "symtab offset: %d\n", (UInt32)(hdr->PointerToSymbolTable) );
2060 debugBelch( "# symbols: %d\n", (UInt32)(hdr->NumberOfSymbols) );
2061 debugBelch( "sz of opt hdr: %d\n", (UInt32)(hdr->SizeOfOptionalHeader) );
2062 debugBelch( "characteristics: 0x%x\n", (UInt32)(hdr->Characteristics) );
2064 /* Print the section table. */
2066 for (i = 0; i < hdr->NumberOfSections; i++) {
2068 COFF_section* sectab_i
2070 myindex ( sizeof_COFF_section, sectab, i );
2077 printName ( sectab_i->Name, strtab );
2087 sectab_i->VirtualSize,
2088 sectab_i->VirtualAddress,
2089 sectab_i->SizeOfRawData,
2090 sectab_i->PointerToRawData,
2091 sectab_i->NumberOfRelocations,
2092 sectab_i->PointerToRelocations,
2093 sectab_i->PointerToRawData
2095 reltab = (COFF_reloc*) (
2096 ((UChar*)(oc->image)) + sectab_i->PointerToRelocations
2099 if ( sectab_i->Characteristics & MYIMAGE_SCN_LNK_NRELOC_OVFL ) {
2100 /* If the relocation field (a short) has overflowed, the
2101 * real count can be found in the first reloc entry.
2103 * See Section 4.1 (last para) of the PE spec (rev6.0).
2105 COFF_reloc* rel = (COFF_reloc*)
2106 myindex ( sizeof_COFF_reloc, reltab, 0 );
2107 noRelocs = rel->VirtualAddress;
2110 noRelocs = sectab_i->NumberOfRelocations;
2114 for (; j < noRelocs; j++) {
2116 COFF_reloc* rel = (COFF_reloc*)
2117 myindex ( sizeof_COFF_reloc, reltab, j );
2119 " type 0x%-4x vaddr 0x%-8x name `",
2121 rel->VirtualAddress );
2122 sym = (COFF_symbol*)
2123 myindex ( sizeof_COFF_symbol, symtab, rel->SymbolTableIndex );
2124 /* Hmm..mysterious looking offset - what's it for? SOF */
2125 printName ( sym->Name, strtab -10 );
2132 debugBelch("string table has size 0x%x\n", * (UInt32*)strtab );
2133 debugBelch("---START of string table---\n");
2134 for (i = 4; i < *(Int32*)strtab; i++) {
2136 debugBelch("\n"); else
2137 debugBelch("%c", strtab[i] );
2139 debugBelch("--- END of string table---\n");
2144 COFF_symbol* symtab_i;
2145 if (i >= (Int32)(hdr->NumberOfSymbols)) break;
2146 symtab_i = (COFF_symbol*)
2147 myindex ( sizeof_COFF_symbol, symtab, i );
2153 printName ( symtab_i->Name, strtab );
2162 (Int32)(symtab_i->SectionNumber),
2163 (UInt32)symtab_i->Type,
2164 (UInt32)symtab_i->StorageClass,
2165 (UInt32)symtab_i->NumberOfAuxSymbols
2167 i += symtab_i->NumberOfAuxSymbols;
2177 ocGetNames_PEi386 ( ObjectCode* oc )
2180 COFF_section* sectab;
2181 COFF_symbol* symtab;
2188 hdr = (COFF_header*)(oc->image);
2189 sectab = (COFF_section*) (
2190 ((UChar*)(oc->image))
2191 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2193 symtab = (COFF_symbol*) (
2194 ((UChar*)(oc->image))
2195 + hdr->PointerToSymbolTable
2197 strtab = ((UChar*)(oc->image))
2198 + hdr->PointerToSymbolTable
2199 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
2201 /* Allocate space for any (local, anonymous) .bss sections. */
2203 for (i = 0; i < hdr->NumberOfSections; i++) {
2206 COFF_section* sectab_i
2208 myindex ( sizeof_COFF_section, sectab, i );
2209 if (0 != strcmp(sectab_i->Name, ".bss")) continue;
2210 /* sof 10/05: the PE spec text isn't too clear regarding what
2211 * the SizeOfRawData field is supposed to hold for object
2212 * file sections containing just uninitialized data -- for executables,
2213 * it is supposed to be zero; unclear what it's supposed to be
2214 * for object files. However, VirtualSize is guaranteed to be
2215 * zero for object files, which definitely suggests that SizeOfRawData
2216 * will be non-zero (where else would the size of this .bss section be
2217 * stored?) Looking at the COFF_section info for incoming object files,
2218 * this certainly appears to be the case.
2220 * => I suspect we've been incorrectly handling .bss sections in (relocatable)
2221 * object files up until now. This turned out to bite us with ghc-6.4.1's use
2222 * of gcc-3.4.x, which has started to emit initially-zeroed-out local 'static'
2223 * variable decls into to the .bss section. (The specific function in Q which
2224 * triggered this is libraries/base/cbits/dirUtils.c:__hscore_getFolderPath())
2226 if (sectab_i->VirtualSize == 0 && sectab_i->SizeOfRawData == 0) continue;
2227 /* This is a non-empty .bss section. Allocate zeroed space for
2228 it, and set its PointerToRawData field such that oc->image +
2229 PointerToRawData == addr_of_zeroed_space. */
2230 bss_sz = sectab_i->VirtualSize;
2231 if ( bss_sz < sectab_i->SizeOfRawData) { bss_sz = sectab_i->SizeOfRawData; }
2232 zspace = stgCallocBytes(1, bss_sz, "ocGetNames_PEi386(anonymous bss)");
2233 sectab_i->PointerToRawData = ((UChar*)zspace) - ((UChar*)(oc->image));
2234 addProddableBlock(oc, zspace, bss_sz);
2235 /* debugBelch("BSS anon section at 0x%x\n", zspace); */
2238 /* Copy section information into the ObjectCode. */
2240 for (i = 0; i < hdr->NumberOfSections; i++) {
2246 = SECTIONKIND_OTHER;
2247 COFF_section* sectab_i
2249 myindex ( sizeof_COFF_section, sectab, i );
2250 IF_DEBUG(linker, debugBelch("section name = %s\n", sectab_i->Name ));
2253 /* I'm sure this is the Right Way to do it. However, the
2254 alternative of testing the sectab_i->Name field seems to
2255 work ok with Cygwin.
2257 if (sectab_i->Characteristics & MYIMAGE_SCN_CNT_CODE ||
2258 sectab_i->Characteristics & MYIMAGE_SCN_CNT_INITIALIZED_DATA)
2259 kind = SECTIONKIND_CODE_OR_RODATA;
2262 if (0==strcmp(".text",sectab_i->Name) ||
2263 0==strcmp(".rdata",sectab_i->Name)||
2264 0==strcmp(".rodata",sectab_i->Name))
2265 kind = SECTIONKIND_CODE_OR_RODATA;
2266 if (0==strcmp(".data",sectab_i->Name) ||
2267 0==strcmp(".bss",sectab_i->Name))
2268 kind = SECTIONKIND_RWDATA;
2270 ASSERT(sectab_i->SizeOfRawData == 0 || sectab_i->VirtualSize == 0);
2271 sz = sectab_i->SizeOfRawData;
2272 if (sz < sectab_i->VirtualSize) sz = sectab_i->VirtualSize;
2274 start = ((UChar*)(oc->image)) + sectab_i->PointerToRawData;
2275 end = start + sz - 1;
2277 if (kind == SECTIONKIND_OTHER
2278 /* Ignore sections called which contain stabs debugging
2280 && 0 != strcmp(".stab", sectab_i->Name)
2281 && 0 != strcmp(".stabstr", sectab_i->Name)
2282 /* ignore constructor section for now */
2283 && 0 != strcmp(".ctors", sectab_i->Name)
2285 errorBelch("Unknown PEi386 section name `%s' (while processing: %s)", sectab_i->Name, oc->fileName);
2289 if (kind != SECTIONKIND_OTHER && end >= start) {
2290 addSection(oc, kind, start, end);
2291 addProddableBlock(oc, start, end - start + 1);
2295 /* Copy exported symbols into the ObjectCode. */
2297 oc->n_symbols = hdr->NumberOfSymbols;
2298 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
2299 "ocGetNames_PEi386(oc->symbols)");
2300 /* Call me paranoid; I don't care. */
2301 for (i = 0; i < oc->n_symbols; i++)
2302 oc->symbols[i] = NULL;
2306 COFF_symbol* symtab_i;
2307 if (i >= (Int32)(hdr->NumberOfSymbols)) break;
2308 symtab_i = (COFF_symbol*)
2309 myindex ( sizeof_COFF_symbol, symtab, i );
2313 if (symtab_i->StorageClass == MYIMAGE_SYM_CLASS_EXTERNAL
2314 && symtab_i->SectionNumber != MYIMAGE_SYM_UNDEFINED) {
2315 /* This symbol is global and defined, viz, exported */
2316 /* for MYIMAGE_SYMCLASS_EXTERNAL
2317 && !MYIMAGE_SYM_UNDEFINED,
2318 the address of the symbol is:
2319 address of relevant section + offset in section
2321 COFF_section* sectabent
2322 = (COFF_section*) myindex ( sizeof_COFF_section,
2324 symtab_i->SectionNumber-1 );
2325 addr = ((UChar*)(oc->image))
2326 + (sectabent->PointerToRawData
2330 if (symtab_i->SectionNumber == MYIMAGE_SYM_UNDEFINED
2331 && symtab_i->Value > 0) {
2332 /* This symbol isn't in any section at all, ie, global bss.
2333 Allocate zeroed space for it. */
2334 addr = stgCallocBytes(1, symtab_i->Value,
2335 "ocGetNames_PEi386(non-anonymous bss)");
2336 addSection(oc, SECTIONKIND_RWDATA, addr,
2337 ((UChar*)addr) + symtab_i->Value - 1);
2338 addProddableBlock(oc, addr, symtab_i->Value);
2339 /* debugBelch("BSS section at 0x%x\n", addr); */
2342 if (addr != NULL ) {
2343 sname = cstring_from_COFF_symbol_name ( symtab_i->Name, strtab );
2344 /* debugBelch("addSymbol %p `%s \n", addr,sname); */
2345 IF_DEBUG(linker, debugBelch("addSymbol %p `%s'\n", addr,sname);)
2346 ASSERT(i >= 0 && i < oc->n_symbols);
2347 /* cstring_from_COFF_symbol_name always succeeds. */
2348 oc->symbols[i] = sname;
2349 ghciInsertStrHashTable(oc->fileName, symhash, sname, addr);
2353 "IGNORING symbol %d\n"
2357 printName ( symtab_i->Name, strtab );
2366 (Int32)(symtab_i->SectionNumber),
2367 (UInt32)symtab_i->Type,
2368 (UInt32)symtab_i->StorageClass,
2369 (UInt32)symtab_i->NumberOfAuxSymbols
2374 i += symtab_i->NumberOfAuxSymbols;
2383 ocResolve_PEi386 ( ObjectCode* oc )
2386 COFF_section* sectab;
2387 COFF_symbol* symtab;
2397 /* ToDo: should be variable-sized? But is at least safe in the
2398 sense of buffer-overrun-proof. */
2400 /* debugBelch("resolving for %s\n", oc->fileName); */
2402 hdr = (COFF_header*)(oc->image);
2403 sectab = (COFF_section*) (
2404 ((UChar*)(oc->image))
2405 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2407 symtab = (COFF_symbol*) (
2408 ((UChar*)(oc->image))
2409 + hdr->PointerToSymbolTable
2411 strtab = ((UChar*)(oc->image))
2412 + hdr->PointerToSymbolTable
2413 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
2415 for (i = 0; i < hdr->NumberOfSections; i++) {
2416 COFF_section* sectab_i
2418 myindex ( sizeof_COFF_section, sectab, i );
2421 ((UChar*)(oc->image)) + sectab_i->PointerToRelocations
2424 /* Ignore sections called which contain stabs debugging
2426 if (0 == strcmp(".stab", sectab_i->Name)
2427 || 0 == strcmp(".stabstr", sectab_i->Name)
2428 || 0 == strcmp(".ctors", sectab_i->Name))
2431 if ( sectab_i->Characteristics & MYIMAGE_SCN_LNK_NRELOC_OVFL ) {
2432 /* If the relocation field (a short) has overflowed, the
2433 * real count can be found in the first reloc entry.
2435 * See Section 4.1 (last para) of the PE spec (rev6.0).
2437 * Nov2003 update: the GNU linker still doesn't correctly
2438 * handle the generation of relocatable object files with
2439 * overflown relocations. Hence the output to warn of potential
2442 COFF_reloc* rel = (COFF_reloc*)
2443 myindex ( sizeof_COFF_reloc, reltab, 0 );
2444 noRelocs = rel->VirtualAddress;
2446 /* 10/05: we now assume (and check for) a GNU ld that is capable
2447 * of handling object files with (>2^16) of relocs.
2450 debugBelch("WARNING: Overflown relocation field (# relocs found: %u)\n",
2455 noRelocs = sectab_i->NumberOfRelocations;
2460 for (; j < noRelocs; j++) {
2462 COFF_reloc* reltab_j
2464 myindex ( sizeof_COFF_reloc, reltab, j );
2466 /* the location to patch */
2468 ((UChar*)(oc->image))
2469 + (sectab_i->PointerToRawData
2470 + reltab_j->VirtualAddress
2471 - sectab_i->VirtualAddress )
2473 /* the existing contents of pP */
2475 /* the symbol to connect to */
2476 sym = (COFF_symbol*)
2477 myindex ( sizeof_COFF_symbol,
2478 symtab, reltab_j->SymbolTableIndex );
2481 "reloc sec %2d num %3d: type 0x%-4x "
2482 "vaddr 0x%-8x name `",
2484 (UInt32)reltab_j->Type,
2485 reltab_j->VirtualAddress );
2486 printName ( sym->Name, strtab );
2487 debugBelch("'\n" ));
2489 if (sym->StorageClass == MYIMAGE_SYM_CLASS_STATIC) {
2490 COFF_section* section_sym
2491 = findPEi386SectionCalled ( oc, sym->Name );
2493 errorBelch("%s: can't find section `%s'", oc->fileName, sym->Name);
2496 S = ((UInt32)(oc->image))
2497 + (section_sym->PointerToRawData
2500 copyName ( sym->Name, strtab, symbol, 1000-1 );
2501 (void*)S = lookupLocalSymbol( oc, symbol );
2502 if ((void*)S != NULL) goto foundit;
2503 (void*)S = lookupSymbol( symbol );
2504 if ((void*)S != NULL) goto foundit;
2505 zapTrailingAtSign ( symbol );
2506 (void*)S = lookupLocalSymbol( oc, symbol );
2507 if ((void*)S != NULL) goto foundit;
2508 (void*)S = lookupSymbol( symbol );
2509 if ((void*)S != NULL) goto foundit;
2510 /* Newline first because the interactive linker has printed "linking..." */
2511 errorBelch("\n%s: unknown symbol `%s'", oc->fileName, symbol);
2515 checkProddableBlock(oc, pP);
2516 switch (reltab_j->Type) {
2517 case MYIMAGE_REL_I386_DIR32:
2520 case MYIMAGE_REL_I386_REL32:
2521 /* Tricky. We have to insert a displacement at
2522 pP which, when added to the PC for the _next_
2523 insn, gives the address of the target (S).
2524 Problem is to know the address of the next insn
2525 when we only know pP. We assume that this
2526 literal field is always the last in the insn,
2527 so that the address of the next insn is pP+4
2528 -- hence the constant 4.
2529 Also I don't know if A should be added, but so
2530 far it has always been zero.
2532 SOF 05/2005: 'A' (old contents of *pP) have been observed
2533 to contain values other than zero (the 'wx' object file
2534 that came with wxhaskell-0.9.4; dunno how it was compiled..).
2535 So, add displacement to old value instead of asserting
2536 A to be zero. Fixes wxhaskell-related crashes, and no other
2537 ill effects have been observed.
2539 Update: the reason why we're seeing these more elaborate
2540 relocations is due to a switch in how the NCG compiles SRTs
2541 and offsets to them from info tables. SRTs live in .(ro)data,
2542 while info tables live in .text, causing GAS to emit REL32/DISP32
2543 relocations with non-zero values. Adding the displacement is
2544 the right thing to do.
2546 *pP = S - ((UInt32)pP) - 4 + A;
2549 debugBelch("%s: unhandled PEi386 relocation type %d",
2550 oc->fileName, reltab_j->Type);
2557 IF_DEBUG(linker, debugBelch("completed %s", oc->fileName));
2561 #endif /* defined(OBJFORMAT_PEi386) */
2564 /* --------------------------------------------------------------------------
2566 * ------------------------------------------------------------------------*/
2568 #if defined(OBJFORMAT_ELF)
2573 #if defined(sparc_HOST_ARCH)
2574 # define ELF_TARGET_SPARC /* Used inside <elf.h> */
2575 #elif defined(i386_HOST_ARCH)
2576 # define ELF_TARGET_386 /* Used inside <elf.h> */
2577 #elif defined(x86_64_HOST_ARCH)
2578 # define ELF_TARGET_X64_64
2580 #elif defined (ia64_HOST_ARCH)
2581 # define ELF_TARGET_IA64 /* Used inside <elf.h> */
2583 # define ELF_FUNCTION_DESC /* calling convention uses function descriptors */
2584 # define ELF_NEED_GOT /* needs Global Offset Table */
2585 # define ELF_NEED_PLT /* needs Procedure Linkage Tables */
2588 #if !defined(openbsd_HOST_OS)
2591 /* openbsd elf has things in different places, with diff names */
2592 #include <elf_abi.h>
2593 #include <machine/reloc.h>
2594 #define R_386_32 RELOC_32
2595 #define R_386_PC32 RELOC_PC32
2599 * Define a set of types which can be used for both ELF32 and ELF64
2603 #define ELFCLASS ELFCLASS64
2604 #define Elf_Addr Elf64_Addr
2605 #define Elf_Word Elf64_Word
2606 #define Elf_Sword Elf64_Sword
2607 #define Elf_Ehdr Elf64_Ehdr
2608 #define Elf_Phdr Elf64_Phdr
2609 #define Elf_Shdr Elf64_Shdr
2610 #define Elf_Sym Elf64_Sym
2611 #define Elf_Rel Elf64_Rel
2612 #define Elf_Rela Elf64_Rela
2613 #define ELF_ST_TYPE ELF64_ST_TYPE
2614 #define ELF_ST_BIND ELF64_ST_BIND
2615 #define ELF_R_TYPE ELF64_R_TYPE
2616 #define ELF_R_SYM ELF64_R_SYM
2618 #define ELFCLASS ELFCLASS32
2619 #define Elf_Addr Elf32_Addr
2620 #define Elf_Word Elf32_Word
2621 #define Elf_Sword Elf32_Sword
2622 #define Elf_Ehdr Elf32_Ehdr
2623 #define Elf_Phdr Elf32_Phdr
2624 #define Elf_Shdr Elf32_Shdr
2625 #define Elf_Sym Elf32_Sym
2626 #define Elf_Rel Elf32_Rel
2627 #define Elf_Rela Elf32_Rela
2629 #define ELF_ST_TYPE ELF32_ST_TYPE
2632 #define ELF_ST_BIND ELF32_ST_BIND
2635 #define ELF_R_TYPE ELF32_R_TYPE
2638 #define ELF_R_SYM ELF32_R_SYM
2644 * Functions to allocate entries in dynamic sections. Currently we simply
2645 * preallocate a large number, and we don't check if a entry for the given
2646 * target already exists (a linear search is too slow). Ideally these
2647 * entries would be associated with symbols.
2650 /* These sizes sufficient to load HSbase + HShaskell98 + a few modules */
2651 #define GOT_SIZE 0x20000
2652 #define FUNCTION_TABLE_SIZE 0x10000
2653 #define PLT_SIZE 0x08000
2656 static Elf_Addr got[GOT_SIZE];
2657 static unsigned int gotIndex;
2658 static Elf_Addr gp_val = (Elf_Addr)got;
2661 allocateGOTEntry(Elf_Addr target)
2665 if (gotIndex >= GOT_SIZE)
2666 barf("Global offset table overflow");
2668 entry = &got[gotIndex++];
2670 return (Elf_Addr)entry;
2674 #ifdef ELF_FUNCTION_DESC
2680 static FunctionDesc functionTable[FUNCTION_TABLE_SIZE];
2681 static unsigned int functionTableIndex;
2684 allocateFunctionDesc(Elf_Addr target)
2686 FunctionDesc *entry;
2688 if (functionTableIndex >= FUNCTION_TABLE_SIZE)
2689 barf("Function table overflow");
2691 entry = &functionTable[functionTableIndex++];
2693 entry->gp = (Elf_Addr)gp_val;
2694 return (Elf_Addr)entry;
2698 copyFunctionDesc(Elf_Addr target)
2700 FunctionDesc *olddesc = (FunctionDesc *)target;
2701 FunctionDesc *newdesc;
2703 newdesc = (FunctionDesc *)allocateFunctionDesc(olddesc->ip);
2704 newdesc->gp = olddesc->gp;
2705 return (Elf_Addr)newdesc;
2710 #ifdef ia64_HOST_ARCH
2711 static void ia64_reloc_gprel22(Elf_Addr target, Elf_Addr value);
2712 static void ia64_reloc_pcrel21(Elf_Addr target, Elf_Addr value, ObjectCode *oc);
2714 static unsigned char plt_code[] =
2716 /* taken from binutils bfd/elfxx-ia64.c */
2717 0x0b, 0x78, 0x00, 0x02, 0x00, 0x24, /* [MMI] addl r15=0,r1;; */
2718 0x00, 0x41, 0x3c, 0x30, 0x28, 0xc0, /* ld8 r16=[r15],8 */
2719 0x01, 0x08, 0x00, 0x84, /* mov r14=r1;; */
2720 0x11, 0x08, 0x00, 0x1e, 0x18, 0x10, /* [MIB] ld8 r1=[r15] */
2721 0x60, 0x80, 0x04, 0x80, 0x03, 0x00, /* mov b6=r16 */
2722 0x60, 0x00, 0x80, 0x00 /* br.few b6;; */
2725 /* If we can't get to the function descriptor via gp, take a local copy of it */
2726 #define PLT_RELOC(code, target) { \
2727 Elf64_Sxword rel_value = target - gp_val; \
2728 if ((rel_value > 0x1fffff) || (rel_value < -0x1fffff)) \
2729 ia64_reloc_gprel22((Elf_Addr)code, copyFunctionDesc(target)); \
2731 ia64_reloc_gprel22((Elf_Addr)code, target); \
2736 unsigned char code[sizeof(plt_code)];
2740 allocatePLTEntry(Elf_Addr target, ObjectCode *oc)
2742 PLTEntry *plt = (PLTEntry *)oc->plt;
2745 if (oc->pltIndex >= PLT_SIZE)
2746 barf("Procedure table overflow");
2748 entry = &plt[oc->pltIndex++];
2749 memcpy(entry->code, plt_code, sizeof(entry->code));
2750 PLT_RELOC(entry->code, target);
2751 return (Elf_Addr)entry;
2757 return (PLT_SIZE * sizeof(PLTEntry));
2762 #if x86_64_HOST_ARCH
2763 // On x86_64, 32-bit relocations are often used, which requires that
2764 // we can resolve a symbol to a 32-bit offset. However, shared
2765 // libraries are placed outside the 2Gb area, which leaves us with a
2766 // problem when we need to give a 32-bit offset to a symbol in a
2769 // For a function symbol, we can allocate a bounce sequence inside the
2770 // 2Gb area and resolve the symbol to this. The bounce sequence is
2771 // simply a long jump instruction to the real location of the symbol.
2773 // For data references, we're screwed.
2776 unsigned char jmp[8]; /* 6 byte instruction: jmpq *0x00000002(%rip) */
2780 #define X86_64_BB_SIZE 1024
2782 static x86_64_bounce *x86_64_bounce_buffer = NULL;
2783 static nat x86_64_bb_next_off;
2786 x86_64_high_symbol( char *lbl, void *addr )
2788 x86_64_bounce *bounce;
2790 if ( x86_64_bounce_buffer == NULL ||
2791 x86_64_bb_next_off >= X86_64_BB_SIZE ) {
2792 x86_64_bounce_buffer =
2793 mmap(NULL, X86_64_BB_SIZE * sizeof(x86_64_bounce),
2794 PROT_EXEC|PROT_READ|PROT_WRITE,
2795 MAP_PRIVATE|MAP_32BIT|MAP_ANONYMOUS, -1, 0);
2796 if (x86_64_bounce_buffer == MAP_FAILED) {
2797 barf("x86_64_high_symbol: mmap failed");
2799 x86_64_bb_next_off = 0;
2801 bounce = &x86_64_bounce_buffer[x86_64_bb_next_off];
2802 bounce->jmp[0] = 0xff;
2803 bounce->jmp[1] = 0x25;
2804 bounce->jmp[2] = 0x02;
2805 bounce->jmp[3] = 0x00;
2806 bounce->jmp[4] = 0x00;
2807 bounce->jmp[5] = 0x00;
2808 bounce->addr = addr;
2809 x86_64_bb_next_off++;
2811 IF_DEBUG(linker, debugBelch("x86_64: allocated bounce entry for %s->%p at %p\n",
2812 lbl, addr, bounce));
2814 insertStrHashTable(symhash, lbl, bounce);
2821 * Generic ELF functions
2825 findElfSection ( void* objImage, Elf_Word sh_type )
2827 char* ehdrC = (char*)objImage;
2828 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2829 Elf_Shdr* shdr = (Elf_Shdr*)(ehdrC + ehdr->e_shoff);
2830 char* sh_strtab = ehdrC + shdr[ehdr->e_shstrndx].sh_offset;
2834 for (i = 0; i < ehdr->e_shnum; i++) {
2835 if (shdr[i].sh_type == sh_type
2836 /* Ignore the section header's string table. */
2837 && i != ehdr->e_shstrndx
2838 /* Ignore string tables named .stabstr, as they contain
2840 && 0 != memcmp(".stabstr", sh_strtab + shdr[i].sh_name, 8)
2842 ptr = ehdrC + shdr[i].sh_offset;
2849 #if defined(ia64_HOST_ARCH)
2851 findElfSegment ( void* objImage, Elf_Addr vaddr )
2853 char* ehdrC = (char*)objImage;
2854 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2855 Elf_Phdr* phdr = (Elf_Phdr*)(ehdrC + ehdr->e_phoff);
2856 Elf_Addr segaddr = 0;
2859 for (i = 0; i < ehdr->e_phnum; i++) {
2860 segaddr = phdr[i].p_vaddr;
2861 if ((vaddr >= segaddr) && (vaddr < segaddr + phdr[i].p_memsz))
2869 ocVerifyImage_ELF ( ObjectCode* oc )
2873 int i, j, nent, nstrtab, nsymtabs;
2877 char* ehdrC = (char*)(oc->image);
2878 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2880 if (ehdr->e_ident[EI_MAG0] != ELFMAG0 ||
2881 ehdr->e_ident[EI_MAG1] != ELFMAG1 ||
2882 ehdr->e_ident[EI_MAG2] != ELFMAG2 ||
2883 ehdr->e_ident[EI_MAG3] != ELFMAG3) {
2884 errorBelch("%s: not an ELF object", oc->fileName);
2888 if (ehdr->e_ident[EI_CLASS] != ELFCLASS) {
2889 errorBelch("%s: unsupported ELF format", oc->fileName);
2893 if (ehdr->e_ident[EI_DATA] == ELFDATA2LSB) {
2894 IF_DEBUG(linker,debugBelch( "Is little-endian\n" ));
2896 if (ehdr->e_ident[EI_DATA] == ELFDATA2MSB) {
2897 IF_DEBUG(linker,debugBelch( "Is big-endian\n" ));
2899 errorBelch("%s: unknown endiannness", oc->fileName);
2903 if (ehdr->e_type != ET_REL) {
2904 errorBelch("%s: not a relocatable object (.o) file", oc->fileName);
2907 IF_DEBUG(linker, debugBelch( "Is a relocatable object (.o) file\n" ));
2909 IF_DEBUG(linker,debugBelch( "Architecture is " ));
2910 switch (ehdr->e_machine) {
2911 case EM_386: IF_DEBUG(linker,debugBelch( "x86" )); break;
2912 #ifdef EM_SPARC32PLUS
2913 case EM_SPARC32PLUS:
2915 case EM_SPARC: IF_DEBUG(linker,debugBelch( "sparc" )); break;
2917 case EM_IA_64: IF_DEBUG(linker,debugBelch( "ia64" )); break;
2919 case EM_PPC: IF_DEBUG(linker,debugBelch( "powerpc32" )); break;
2921 case EM_X86_64: IF_DEBUG(linker,debugBelch( "x86_64" )); break;
2923 default: IF_DEBUG(linker,debugBelch( "unknown" ));
2924 errorBelch("%s: unknown architecture", oc->fileName);
2928 IF_DEBUG(linker,debugBelch(
2929 "\nSection header table: start %ld, n_entries %d, ent_size %d\n",
2930 (long)ehdr->e_shoff, ehdr->e_shnum, ehdr->e_shentsize ));
2932 ASSERT (ehdr->e_shentsize == sizeof(Elf_Shdr));
2934 shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
2936 if (ehdr->e_shstrndx == SHN_UNDEF) {
2937 errorBelch("%s: no section header string table", oc->fileName);
2940 IF_DEBUG(linker,debugBelch( "Section header string table is section %d\n",
2942 sh_strtab = ehdrC + shdr[ehdr->e_shstrndx].sh_offset;
2945 for (i = 0; i < ehdr->e_shnum; i++) {
2946 IF_DEBUG(linker,debugBelch("%2d: ", i ));
2947 IF_DEBUG(linker,debugBelch("type=%2d ", (int)shdr[i].sh_type ));
2948 IF_DEBUG(linker,debugBelch("size=%4d ", (int)shdr[i].sh_size ));
2949 IF_DEBUG(linker,debugBelch("offs=%4d ", (int)shdr[i].sh_offset ));
2950 IF_DEBUG(linker,debugBelch(" (%p .. %p) ",
2951 ehdrC + shdr[i].sh_offset,
2952 ehdrC + shdr[i].sh_offset + shdr[i].sh_size - 1));
2954 if (shdr[i].sh_type == SHT_REL) {
2955 IF_DEBUG(linker,debugBelch("Rel " ));
2956 } else if (shdr[i].sh_type == SHT_RELA) {
2957 IF_DEBUG(linker,debugBelch("RelA " ));
2959 IF_DEBUG(linker,debugBelch(" "));
2962 IF_DEBUG(linker,debugBelch("sname=%s\n", sh_strtab + shdr[i].sh_name ));
2966 IF_DEBUG(linker,debugBelch( "\nString tables" ));
2969 for (i = 0; i < ehdr->e_shnum; i++) {
2970 if (shdr[i].sh_type == SHT_STRTAB
2971 /* Ignore the section header's string table. */
2972 && i != ehdr->e_shstrndx
2973 /* Ignore string tables named .stabstr, as they contain
2975 && 0 != memcmp(".stabstr", sh_strtab + shdr[i].sh_name, 8)
2977 IF_DEBUG(linker,debugBelch(" section %d is a normal string table", i ));
2978 strtab = ehdrC + shdr[i].sh_offset;
2983 errorBelch("%s: no string tables, or too many", oc->fileName);
2988 IF_DEBUG(linker,debugBelch( "\nSymbol tables" ));
2989 for (i = 0; i < ehdr->e_shnum; i++) {
2990 if (shdr[i].sh_type != SHT_SYMTAB) continue;
2991 IF_DEBUG(linker,debugBelch( "section %d is a symbol table\n", i ));
2993 stab = (Elf_Sym*) (ehdrC + shdr[i].sh_offset);
2994 nent = shdr[i].sh_size / sizeof(Elf_Sym);
2995 IF_DEBUG(linker,debugBelch( " number of entries is apparently %d (%ld rem)\n",
2997 (long)shdr[i].sh_size % sizeof(Elf_Sym)
2999 if (0 != shdr[i].sh_size % sizeof(Elf_Sym)) {
3000 errorBelch("%s: non-integral number of symbol table entries", oc->fileName);
3003 for (j = 0; j < nent; j++) {
3004 IF_DEBUG(linker,debugBelch(" %2d ", j ));
3005 IF_DEBUG(linker,debugBelch(" sec=%-5d size=%-3d val=%5p ",
3006 (int)stab[j].st_shndx,
3007 (int)stab[j].st_size,
3008 (char*)stab[j].st_value ));
3010 IF_DEBUG(linker,debugBelch("type=" ));
3011 switch (ELF_ST_TYPE(stab[j].st_info)) {
3012 case STT_NOTYPE: IF_DEBUG(linker,debugBelch("notype " )); break;
3013 case STT_OBJECT: IF_DEBUG(linker,debugBelch("object " )); break;
3014 case STT_FUNC : IF_DEBUG(linker,debugBelch("func " )); break;
3015 case STT_SECTION: IF_DEBUG(linker,debugBelch("section" )); break;
3016 case STT_FILE: IF_DEBUG(linker,debugBelch("file " )); break;
3017 default: IF_DEBUG(linker,debugBelch("? " )); break;
3019 IF_DEBUG(linker,debugBelch(" " ));
3021 IF_DEBUG(linker,debugBelch("bind=" ));
3022 switch (ELF_ST_BIND(stab[j].st_info)) {
3023 case STB_LOCAL : IF_DEBUG(linker,debugBelch("local " )); break;
3024 case STB_GLOBAL: IF_DEBUG(linker,debugBelch("global" )); break;
3025 case STB_WEAK : IF_DEBUG(linker,debugBelch("weak " )); break;
3026 default: IF_DEBUG(linker,debugBelch("? " )); break;
3028 IF_DEBUG(linker,debugBelch(" " ));
3030 IF_DEBUG(linker,debugBelch("name=%s\n", strtab + stab[j].st_name ));
3034 if (nsymtabs == 0) {
3035 errorBelch("%s: didn't find any symbol tables", oc->fileName);
3042 static int getSectionKind_ELF( Elf_Shdr *hdr, int *is_bss )
3046 if (hdr->sh_type == SHT_PROGBITS
3047 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_EXECINSTR)) {
3048 /* .text-style section */
3049 return SECTIONKIND_CODE_OR_RODATA;
3052 if (hdr->sh_type == SHT_PROGBITS
3053 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_WRITE)) {
3054 /* .data-style section */
3055 return SECTIONKIND_RWDATA;
3058 if (hdr->sh_type == SHT_PROGBITS
3059 && (hdr->sh_flags & SHF_ALLOC) && !(hdr->sh_flags & SHF_WRITE)) {
3060 /* .rodata-style section */
3061 return SECTIONKIND_CODE_OR_RODATA;
3064 if (hdr->sh_type == SHT_NOBITS
3065 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_WRITE)) {
3066 /* .bss-style section */
3068 return SECTIONKIND_RWDATA;
3071 return SECTIONKIND_OTHER;
3076 ocGetNames_ELF ( ObjectCode* oc )
3081 char* ehdrC = (char*)(oc->image);
3082 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
3083 char* strtab = findElfSection ( ehdrC, SHT_STRTAB );
3084 Elf_Shdr* shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
3086 ASSERT(symhash != NULL);
3089 errorBelch("%s: no strtab", oc->fileName);
3094 for (i = 0; i < ehdr->e_shnum; i++) {
3095 /* Figure out what kind of section it is. Logic derived from
3096 Figure 1.14 ("Special Sections") of the ELF document
3097 ("Portable Formats Specification, Version 1.1"). */
3099 SectionKind kind = getSectionKind_ELF(&shdr[i], &is_bss);
3101 if (is_bss && shdr[i].sh_size > 0) {
3102 /* This is a non-empty .bss section. Allocate zeroed space for
3103 it, and set its .sh_offset field such that
3104 ehdrC + .sh_offset == addr_of_zeroed_space. */
3105 char* zspace = stgCallocBytes(1, shdr[i].sh_size,
3106 "ocGetNames_ELF(BSS)");
3107 shdr[i].sh_offset = ((char*)zspace) - ((char*)ehdrC);
3109 debugBelch("BSS section at 0x%x, size %d\n",
3110 zspace, shdr[i].sh_size);
3114 /* fill in the section info */
3115 if (kind != SECTIONKIND_OTHER && shdr[i].sh_size > 0) {
3116 addProddableBlock(oc, ehdrC + shdr[i].sh_offset, shdr[i].sh_size);
3117 addSection(oc, kind, ehdrC + shdr[i].sh_offset,
3118 ehdrC + shdr[i].sh_offset + shdr[i].sh_size - 1);
3121 if (shdr[i].sh_type != SHT_SYMTAB) continue;
3123 /* copy stuff into this module's object symbol table */
3124 stab = (Elf_Sym*) (ehdrC + shdr[i].sh_offset);
3125 nent = shdr[i].sh_size / sizeof(Elf_Sym);
3127 oc->n_symbols = nent;
3128 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
3129 "ocGetNames_ELF(oc->symbols)");
3131 for (j = 0; j < nent; j++) {
3133 char isLocal = FALSE; /* avoids uninit-var warning */
3135 char* nm = strtab + stab[j].st_name;
3136 int secno = stab[j].st_shndx;
3138 /* Figure out if we want to add it; if so, set ad to its
3139 address. Otherwise leave ad == NULL. */
3141 if (secno == SHN_COMMON) {
3143 ad = stgCallocBytes(1, stab[j].st_size, "ocGetNames_ELF(COMMON)");
3145 debugBelch("COMMON symbol, size %d name %s\n",
3146 stab[j].st_size, nm);
3148 /* Pointless to do addProddableBlock() for this area,
3149 since the linker should never poke around in it. */
3152 if ( ( ELF_ST_BIND(stab[j].st_info)==STB_GLOBAL
3153 || ELF_ST_BIND(stab[j].st_info)==STB_LOCAL
3155 /* and not an undefined symbol */
3156 && stab[j].st_shndx != SHN_UNDEF
3157 /* and not in a "special section" */
3158 && stab[j].st_shndx < SHN_LORESERVE
3160 /* and it's a not a section or string table or anything silly */
3161 ( ELF_ST_TYPE(stab[j].st_info)==STT_FUNC ||
3162 ELF_ST_TYPE(stab[j].st_info)==STT_OBJECT ||
3163 ELF_ST_TYPE(stab[j].st_info)==STT_NOTYPE
3166 /* Section 0 is the undefined section, hence > and not >=. */
3167 ASSERT(secno > 0 && secno < ehdr->e_shnum);
3169 if (shdr[secno].sh_type == SHT_NOBITS) {
3170 debugBelch(" BSS symbol, size %d off %d name %s\n",
3171 stab[j].st_size, stab[j].st_value, nm);
3174 ad = ehdrC + shdr[ secno ].sh_offset + stab[j].st_value;
3175 if (ELF_ST_BIND(stab[j].st_info)==STB_LOCAL) {
3178 #ifdef ELF_FUNCTION_DESC
3179 /* dlsym() and the initialisation table both give us function
3180 * descriptors, so to be consistent we store function descriptors
3181 * in the symbol table */
3182 if (ELF_ST_TYPE(stab[j].st_info) == STT_FUNC)
3183 ad = (char *)allocateFunctionDesc((Elf_Addr)ad);
3185 IF_DEBUG(linker,debugBelch( "addOTabName(GLOB): %10p %s %s",
3186 ad, oc->fileName, nm ));
3191 /* And the decision is ... */
3195 oc->symbols[j] = nm;
3198 /* Ignore entirely. */
3200 ghciInsertStrHashTable(oc->fileName, symhash, nm, ad);
3204 IF_DEBUG(linker,debugBelch( "skipping `%s'\n",
3205 strtab + stab[j].st_name ));
3208 "skipping bind = %d, type = %d, shndx = %d `%s'\n",
3209 (int)ELF_ST_BIND(stab[j].st_info),
3210 (int)ELF_ST_TYPE(stab[j].st_info),
3211 (int)stab[j].st_shndx,
3212 strtab + stab[j].st_name
3215 oc->symbols[j] = NULL;
3224 /* Do ELF relocations which lack an explicit addend. All x86-linux
3225 relocations appear to be of this form. */
3227 do_Elf_Rel_relocations ( ObjectCode* oc, char* ehdrC,
3228 Elf_Shdr* shdr, int shnum,
3229 Elf_Sym* stab, char* strtab )
3234 Elf_Rel* rtab = (Elf_Rel*) (ehdrC + shdr[shnum].sh_offset);
3235 int nent = shdr[shnum].sh_size / sizeof(Elf_Rel);
3236 int target_shndx = shdr[shnum].sh_info;
3237 int symtab_shndx = shdr[shnum].sh_link;
3239 stab = (Elf_Sym*) (ehdrC + shdr[ symtab_shndx ].sh_offset);
3240 targ = (Elf_Word*)(ehdrC + shdr[ target_shndx ].sh_offset);
3241 IF_DEBUG(linker,debugBelch( "relocations for section %d using symtab %d\n",
3242 target_shndx, symtab_shndx ));
3244 /* Skip sections that we're not interested in. */
3247 SectionKind kind = getSectionKind_ELF(&shdr[target_shndx], &is_bss);
3248 if (kind == SECTIONKIND_OTHER) {
3249 IF_DEBUG(linker,debugBelch( "skipping (target section not loaded)"));
3254 for (j = 0; j < nent; j++) {
3255 Elf_Addr offset = rtab[j].r_offset;
3256 Elf_Addr info = rtab[j].r_info;
3258 Elf_Addr P = ((Elf_Addr)targ) + offset;
3259 Elf_Word* pP = (Elf_Word*)P;
3264 StgStablePtr stablePtr;
3267 IF_DEBUG(linker,debugBelch( "Rel entry %3d is raw(%6p %6p)",
3268 j, (void*)offset, (void*)info ));
3270 IF_DEBUG(linker,debugBelch( " ZERO" ));
3273 Elf_Sym sym = stab[ELF_R_SYM(info)];
3274 /* First see if it is a local symbol. */
3275 if (ELF_ST_BIND(sym.st_info) == STB_LOCAL) {
3276 /* Yes, so we can get the address directly from the ELF symbol
3278 symbol = sym.st_name==0 ? "(noname)" : strtab+sym.st_name;
3280 (ehdrC + shdr[ sym.st_shndx ].sh_offset
3281 + stab[ELF_R_SYM(info)].st_value);
3284 symbol = strtab + sym.st_name;
3285 stablePtr = (StgStablePtr)lookupHashTable(stablehash, (StgWord)symbol);
3286 if (NULL == stablePtr) {
3287 /* No, so look up the name in our global table. */
3288 S_tmp = lookupSymbol( symbol );
3289 S = (Elf_Addr)S_tmp;
3291 stableVal = deRefStablePtr( stablePtr );
3292 addRootObject((void*)P);
3294 S = (Elf_Addr)S_tmp;
3298 errorBelch("%s: unknown symbol `%s'", oc->fileName, symbol);
3301 IF_DEBUG(linker,debugBelch( "`%s' resolves to %p\n", symbol, (void*)S ));
3304 IF_DEBUG(linker,debugBelch( "Reloc: P = %p S = %p A = %p\n",
3305 (void*)P, (void*)S, (void*)A ));
3306 checkProddableBlock ( oc, pP );
3310 switch (ELF_R_TYPE(info)) {
3311 # ifdef i386_HOST_ARCH
3312 case R_386_32: *pP = value; break;
3313 case R_386_PC32: *pP = value - P; break;
3316 errorBelch("%s: unhandled ELF relocation(Rel) type %lu\n",
3317 oc->fileName, (lnat)ELF_R_TYPE(info));
3325 /* Do ELF relocations for which explicit addends are supplied.
3326 sparc-solaris relocations appear to be of this form. */
3328 do_Elf_Rela_relocations ( ObjectCode* oc, char* ehdrC,
3329 Elf_Shdr* shdr, int shnum,
3330 Elf_Sym* stab, char* strtab )
3333 char *symbol = NULL;
3335 Elf_Rela* rtab = (Elf_Rela*) (ehdrC + shdr[shnum].sh_offset);
3336 int nent = shdr[shnum].sh_size / sizeof(Elf_Rela);
3337 int target_shndx = shdr[shnum].sh_info;
3338 int symtab_shndx = shdr[shnum].sh_link;
3340 stab = (Elf_Sym*) (ehdrC + shdr[ symtab_shndx ].sh_offset);
3341 targ = (Elf_Addr) (ehdrC + shdr[ target_shndx ].sh_offset);
3342 IF_DEBUG(linker,debugBelch( "relocations for section %d using symtab %d\n",
3343 target_shndx, symtab_shndx ));
3345 for (j = 0; j < nent; j++) {
3346 #if defined(DEBUG) || defined(sparc_HOST_ARCH) || defined(ia64_HOST_ARCH) || defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH)
3347 /* This #ifdef only serves to avoid unused-var warnings. */
3348 Elf_Addr offset = rtab[j].r_offset;
3349 Elf_Addr P = targ + offset;
3351 Elf_Addr info = rtab[j].r_info;
3352 Elf_Addr A = rtab[j].r_addend;
3356 # if defined(sparc_HOST_ARCH)
3357 Elf_Word* pP = (Elf_Word*)P;
3359 # elif defined(ia64_HOST_ARCH)
3360 Elf64_Xword *pP = (Elf64_Xword *)P;
3362 # elif defined(powerpc_HOST_ARCH)
3366 IF_DEBUG(linker,debugBelch( "Rel entry %3d is raw(%6p %6p %6p) ",
3367 j, (void*)offset, (void*)info,
3370 IF_DEBUG(linker,debugBelch( " ZERO" ));
3373 Elf_Sym sym = stab[ELF_R_SYM(info)];
3374 /* First see if it is a local symbol. */
3375 if (ELF_ST_BIND(sym.st_info) == STB_LOCAL) {
3376 /* Yes, so we can get the address directly from the ELF symbol
3378 symbol = sym.st_name==0 ? "(noname)" : strtab+sym.st_name;
3380 (ehdrC + shdr[ sym.st_shndx ].sh_offset
3381 + stab[ELF_R_SYM(info)].st_value);
3382 #ifdef ELF_FUNCTION_DESC
3383 /* Make a function descriptor for this function */
3384 if (S && ELF_ST_TYPE(sym.st_info) == STT_FUNC) {
3385 S = allocateFunctionDesc(S + A);
3390 /* No, so look up the name in our global table. */
3391 symbol = strtab + sym.st_name;
3392 S_tmp = lookupSymbol( symbol );
3393 S = (Elf_Addr)S_tmp;
3395 #ifdef ELF_FUNCTION_DESC
3396 /* If a function, already a function descriptor - we would
3397 have to copy it to add an offset. */
3398 if (S && (ELF_ST_TYPE(sym.st_info) == STT_FUNC) && (A != 0))
3399 errorBelch("%s: function %s with addend %p", oc->fileName, symbol, (void *)A);
3403 errorBelch("%s: unknown symbol `%s'", oc->fileName, symbol);
3406 IF_DEBUG(linker,debugBelch( "`%s' resolves to %p", symbol, (void*)S ));
3409 IF_DEBUG(linker,debugBelch("Reloc: P = %p S = %p A = %p\n",
3410 (void*)P, (void*)S, (void*)A ));
3411 /* checkProddableBlock ( oc, (void*)P ); */
3415 switch (ELF_R_TYPE(info)) {
3416 # if defined(sparc_HOST_ARCH)
3417 case R_SPARC_WDISP30:
3418 w1 = *pP & 0xC0000000;
3419 w2 = (Elf_Word)((value - P) >> 2);
3420 ASSERT((w2 & 0xC0000000) == 0);
3425 w1 = *pP & 0xFFC00000;
3426 w2 = (Elf_Word)(value >> 10);
3427 ASSERT((w2 & 0xFFC00000) == 0);
3433 w2 = (Elf_Word)(value & 0x3FF);
3434 ASSERT((w2 & ~0x3FF) == 0);
3438 /* According to the Sun documentation:
3440 This relocation type resembles R_SPARC_32, except it refers to an
3441 unaligned word. That is, the word to be relocated must be treated
3442 as four separate bytes with arbitrary alignment, not as a word
3443 aligned according to the architecture requirements.
3445 (JRS: which means that freeloading on the R_SPARC_32 case
3446 is probably wrong, but hey ...)
3450 w2 = (Elf_Word)value;
3453 # elif defined(ia64_HOST_ARCH)
3454 case R_IA64_DIR64LSB:
3455 case R_IA64_FPTR64LSB:
3458 case R_IA64_PCREL64LSB:
3461 case R_IA64_SEGREL64LSB:
3462 addr = findElfSegment(ehdrC, value);
3465 case R_IA64_GPREL22:
3466 ia64_reloc_gprel22(P, value);
3468 case R_IA64_LTOFF22:
3469 case R_IA64_LTOFF22X:
3470 case R_IA64_LTOFF_FPTR22:
3471 addr = allocateGOTEntry(value);
3472 ia64_reloc_gprel22(P, addr);
3474 case R_IA64_PCREL21B:
3475 ia64_reloc_pcrel21(P, S, oc);
3478 /* This goes with R_IA64_LTOFF22X and points to the load to
3479 * convert into a move. We don't implement relaxation. */
3481 # elif defined(powerpc_HOST_ARCH)
3482 case R_PPC_ADDR16_LO:
3483 *(Elf32_Half*) P = value;
3486 case R_PPC_ADDR16_HI:
3487 *(Elf32_Half*) P = value >> 16;
3490 case R_PPC_ADDR16_HA:
3491 *(Elf32_Half*) P = (value + 0x8000) >> 16;
3495 *(Elf32_Word *) P = value;
3499 *(Elf32_Word *) P = value - P;
3505 if( delta << 6 >> 6 != delta )
3507 value = makeJumpIsland( oc, ELF_R_SYM(info), value );
3510 if( value == 0 || delta << 6 >> 6 != delta )
3512 barf( "Unable to make ppcJumpIsland for #%d",
3518 *(Elf_Word *) P = (*(Elf_Word *) P & 0xfc000003)
3519 | (delta & 0x3fffffc);
3523 #if x86_64_HOST_ARCH
3525 *(Elf64_Xword *)P = value;
3530 StgInt64 off = value - P;
3531 if (off >= 0x7fffffffL || off < -0x80000000L) {
3532 barf("R_X86_64_PC32 relocation out of range: %s = %p",
3535 *(Elf64_Word *)P = (Elf64_Word)off;
3540 if (value >= 0x7fffffffL) {
3541 barf("R_X86_64_32 relocation out of range: %s = %p\n",
3544 *(Elf64_Word *)P = (Elf64_Word)value;
3548 if ((StgInt64)value > 0x7fffffffL || (StgInt64)value < -0x80000000L) {
3549 barf("R_X86_64_32S relocation out of range: %s = %p\n",
3552 *(Elf64_Sword *)P = (Elf64_Sword)value;
3557 errorBelch("%s: unhandled ELF relocation(RelA) type %lu\n",
3558 oc->fileName, (lnat)ELF_R_TYPE(info));
3567 ocResolve_ELF ( ObjectCode* oc )
3571 Elf_Sym* stab = NULL;
3572 char* ehdrC = (char*)(oc->image);
3573 Elf_Ehdr* ehdr = (Elf_Ehdr*) ehdrC;
3574 Elf_Shdr* shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
3576 /* first find "the" symbol table */
3577 stab = (Elf_Sym*) findElfSection ( ehdrC, SHT_SYMTAB );
3579 /* also go find the string table */
3580 strtab = findElfSection ( ehdrC, SHT_STRTAB );
3582 if (stab == NULL || strtab == NULL) {
3583 errorBelch("%s: can't find string or symbol table", oc->fileName);
3587 /* Process the relocation sections. */
3588 for (shnum = 0; shnum < ehdr->e_shnum; shnum++) {
3589 if (shdr[shnum].sh_type == SHT_REL) {
3590 ok = do_Elf_Rel_relocations ( oc, ehdrC, shdr,
3591 shnum, stab, strtab );
3595 if (shdr[shnum].sh_type == SHT_RELA) {
3596 ok = do_Elf_Rela_relocations ( oc, ehdrC, shdr,
3597 shnum, stab, strtab );
3602 /* Free the local symbol table; we won't need it again. */
3603 freeHashTable(oc->lochash, NULL);
3606 #if defined(powerpc_HOST_ARCH)
3607 ocFlushInstructionCache( oc );
3615 * Instructions are 41 bits long, packed into 128 bit bundles with a 5-bit template
3616 * at the front. The following utility functions pack and unpack instructions, and
3617 * take care of the most common relocations.
3620 #ifdef ia64_HOST_ARCH
3623 ia64_extract_instruction(Elf64_Xword *target)
3626 int slot = (Elf_Addr)target & 3;
3627 target = (Elf_Addr)target & ~3;
3635 return ((w1 >> 5) & 0x1ffffffffff);
3637 return (w1 >> 46) | ((w2 & 0x7fffff) << 18);
3641 barf("ia64_extract_instruction: invalid slot %p", target);
3646 ia64_deposit_instruction(Elf64_Xword *target, Elf64_Xword value)
3648 int slot = (Elf_Addr)target & 3;
3649 target = (Elf_Addr)target & ~3;
3654 *target |= value << 5;
3657 *target |= value << 46;
3658 *(target+1) |= value >> 18;
3661 *(target+1) |= value << 23;
3667 ia64_reloc_gprel22(Elf_Addr target, Elf_Addr value)
3669 Elf64_Xword instruction;
3670 Elf64_Sxword rel_value;
3672 rel_value = value - gp_val;
3673 if ((rel_value > 0x1fffff) || (rel_value < -0x1fffff))
3674 barf("GP-relative data out of range (address = 0x%lx, gp = 0x%lx)", value, gp_val);
3676 instruction = ia64_extract_instruction((Elf64_Xword *)target);
3677 instruction |= (((rel_value >> 0) & 0x07f) << 13) /* imm7b */
3678 | (((rel_value >> 7) & 0x1ff) << 27) /* imm9d */
3679 | (((rel_value >> 16) & 0x01f) << 22) /* imm5c */
3680 | ((Elf64_Xword)(rel_value < 0) << 36); /* s */
3681 ia64_deposit_instruction((Elf64_Xword *)target, instruction);
3685 ia64_reloc_pcrel21(Elf_Addr target, Elf_Addr value, ObjectCode *oc)
3687 Elf64_Xword instruction;
3688 Elf64_Sxword rel_value;
3691 entry = allocatePLTEntry(value, oc);
3693 rel_value = (entry >> 4) - (target >> 4);
3694 if ((rel_value > 0xfffff) || (rel_value < -0xfffff))
3695 barf("PLT entry too far away (entry = 0x%lx, target = 0x%lx)", entry, target);
3697 instruction = ia64_extract_instruction((Elf64_Xword *)target);
3698 instruction |= ((rel_value & 0xfffff) << 13) /* imm20b */
3699 | ((Elf64_Xword)(rel_value < 0) << 36); /* s */
3700 ia64_deposit_instruction((Elf64_Xword *)target, instruction);
3706 * PowerPC ELF specifics
3709 #ifdef powerpc_HOST_ARCH
3711 static int ocAllocateJumpIslands_ELF( ObjectCode *oc )
3717 ehdr = (Elf_Ehdr *) oc->image;
3718 shdr = (Elf_Shdr *) ( ((char *)oc->image) + ehdr->e_shoff );
3720 for( i = 0; i < ehdr->e_shnum; i++ )
3721 if( shdr[i].sh_type == SHT_SYMTAB )
3724 if( i == ehdr->e_shnum )
3726 errorBelch( "This ELF file contains no symtab" );
3730 if( shdr[i].sh_entsize != sizeof( Elf_Sym ) )
3732 errorBelch( "The entry size (%d) of the symtab isn't %d\n",
3733 shdr[i].sh_entsize, sizeof( Elf_Sym ) );
3738 return ocAllocateJumpIslands( oc, shdr[i].sh_size / sizeof( Elf_Sym ), 0 );
3741 #endif /* powerpc */
3745 /* --------------------------------------------------------------------------
3747 * ------------------------------------------------------------------------*/
3749 #if defined(OBJFORMAT_MACHO)
3752 Support for MachO linking on Darwin/MacOS X
3753 by Wolfgang Thaller (wolfgang.thaller@gmx.net)
3755 I hereby formally apologize for the hackish nature of this code.
3756 Things that need to be done:
3757 *) implement ocVerifyImage_MachO
3758 *) add still more sanity checks.
3761 #ifdef powerpc_HOST_ARCH
3762 static int ocAllocateJumpIslands_MachO(ObjectCode* oc)
3764 struct mach_header *header = (struct mach_header *) oc->image;
3765 struct load_command *lc = (struct load_command *) (header + 1);
3768 for( i = 0; i < header->ncmds; i++ )
3770 if( lc->cmd == LC_SYMTAB )
3772 // Find out the first and last undefined external
3773 // symbol, so we don't have to allocate too many
3775 struct symtab_command *symLC = (struct symtab_command *) lc;
3776 unsigned min = symLC->nsyms, max = 0;
3777 struct nlist *nlist =
3778 symLC ? (struct nlist*) ((char*) oc->image + symLC->symoff)
3780 for(i=0;i<symLC->nsyms;i++)
3782 if(nlist[i].n_type & N_STAB)
3784 else if(nlist[i].n_type & N_EXT)
3786 if((nlist[i].n_type & N_TYPE) == N_UNDF
3787 && (nlist[i].n_value == 0))
3797 return ocAllocateJumpIslands(oc, max - min + 1, min);
3802 lc = (struct load_command *) ( ((char *)lc) + lc->cmdsize );
3804 return ocAllocateJumpIslands(oc,0,0);
3808 static int ocVerifyImage_MachO(ObjectCode* oc STG_UNUSED)
3810 // FIXME: do some verifying here
3814 static int resolveImports(
3817 struct symtab_command *symLC,
3818 struct section *sect, // ptr to lazy or non-lazy symbol pointer section
3819 unsigned long *indirectSyms,
3820 struct nlist *nlist)
3823 size_t itemSize = 4;
3826 int isJumpTable = 0;
3827 if(!strcmp(sect->sectname,"__jump_table"))
3831 ASSERT(sect->reserved2 == itemSize);
3835 for(i=0; i*itemSize < sect->size;i++)
3837 // according to otool, reserved1 contains the first index into the indirect symbol table
3838 struct nlist *symbol = &nlist[indirectSyms[sect->reserved1+i]];
3839 char *nm = image + symLC->stroff + symbol->n_un.n_strx;
3842 if((symbol->n_type & N_TYPE) == N_UNDF
3843 && (symbol->n_type & N_EXT) && (symbol->n_value != 0))
3844 addr = (void*) (symbol->n_value);
3845 else if((addr = lookupLocalSymbol(oc,nm)) != NULL)
3848 addr = lookupSymbol(nm);
3851 errorBelch("\n%s: unknown symbol `%s'", oc->fileName, nm);
3859 checkProddableBlock(oc,image + sect->offset + i*itemSize);
3860 *(image + sect->offset + i*itemSize) = 0xe9; // jmp
3861 *(unsigned*)(image + sect->offset + i*itemSize + 1)
3862 = (char*)addr - (image + sect->offset + i*itemSize + 5);
3867 checkProddableBlock(oc,((void**)(image + sect->offset)) + i);
3868 ((void**)(image + sect->offset))[i] = addr;
3875 static unsigned long relocateAddress(
3878 struct section* sections,
3879 unsigned long address)
3882 for(i = 0; i < nSections; i++)
3884 if(sections[i].addr <= address
3885 && address < sections[i].addr + sections[i].size)
3887 return (unsigned long)oc->image
3888 + sections[i].offset + address - sections[i].addr;
3891 barf("Invalid Mach-O file:"
3892 "Address out of bounds while relocating object file");
3896 static int relocateSection(
3899 struct symtab_command *symLC, struct nlist *nlist,
3900 int nSections, struct section* sections, struct section *sect)
3902 struct relocation_info *relocs;
3905 if(!strcmp(sect->sectname,"__la_symbol_ptr"))
3907 else if(!strcmp(sect->sectname,"__nl_symbol_ptr"))
3909 else if(!strcmp(sect->sectname,"__la_sym_ptr2"))
3911 else if(!strcmp(sect->sectname,"__la_sym_ptr3"))
3915 relocs = (struct relocation_info*) (image + sect->reloff);
3919 if(relocs[i].r_address & R_SCATTERED)
3921 struct scattered_relocation_info *scat =
3922 (struct scattered_relocation_info*) &relocs[i];
3926 if(scat->r_length == 2)
3928 unsigned long word = 0;
3929 unsigned long* wordPtr = (unsigned long*) (image + sect->offset + scat->r_address);
3930 checkProddableBlock(oc,wordPtr);
3932 // Note on relocation types:
3933 // i386 uses the GENERIC_RELOC_* types,
3934 // while ppc uses special PPC_RELOC_* types.
3935 // *_RELOC_VANILLA and *_RELOC_PAIR have the same value
3936 // in both cases, all others are different.
3937 // Therefore, we use GENERIC_RELOC_VANILLA
3938 // and GENERIC_RELOC_PAIR instead of the PPC variants,
3939 // and use #ifdefs for the other types.
3941 // Step 1: Figure out what the relocated value should be
3942 if(scat->r_type == GENERIC_RELOC_VANILLA)
3944 word = *wordPtr + (unsigned long) relocateAddress(
3951 #ifdef powerpc_HOST_ARCH
3952 else if(scat->r_type == PPC_RELOC_SECTDIFF
3953 || scat->r_type == PPC_RELOC_LO16_SECTDIFF
3954 || scat->r_type == PPC_RELOC_HI16_SECTDIFF
3955 || scat->r_type == PPC_RELOC_HA16_SECTDIFF)
3957 else if(scat->r_type == GENERIC_RELOC_SECTDIFF)
3960 struct scattered_relocation_info *pair =
3961 (struct scattered_relocation_info*) &relocs[i+1];
3963 if(!pair->r_scattered || pair->r_type != GENERIC_RELOC_PAIR)
3964 barf("Invalid Mach-O file: "
3965 "RELOC_*_SECTDIFF not followed by RELOC_PAIR");
3967 word = (unsigned long)
3968 (relocateAddress(oc, nSections, sections, scat->r_value)
3969 - relocateAddress(oc, nSections, sections, pair->r_value));
3972 #ifdef powerpc_HOST_ARCH
3973 else if(scat->r_type == PPC_RELOC_HI16
3974 || scat->r_type == PPC_RELOC_LO16
3975 || scat->r_type == PPC_RELOC_HA16
3976 || scat->r_type == PPC_RELOC_LO14)
3977 { // these are generated by label+offset things
3978 struct relocation_info *pair = &relocs[i+1];
3979 if((pair->r_address & R_SCATTERED) || pair->r_type != PPC_RELOC_PAIR)
3980 barf("Invalid Mach-O file: "
3981 "PPC_RELOC_* not followed by PPC_RELOC_PAIR");
3983 if(scat->r_type == PPC_RELOC_LO16)
3985 word = ((unsigned short*) wordPtr)[1];
3986 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
3988 else if(scat->r_type == PPC_RELOC_LO14)
3990 barf("Unsupported Relocation: PPC_RELOC_LO14");
3991 word = ((unsigned short*) wordPtr)[1] & 0xFFFC;
3992 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
3994 else if(scat->r_type == PPC_RELOC_HI16)
3996 word = ((unsigned short*) wordPtr)[1] << 16;
3997 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF);
3999 else if(scat->r_type == PPC_RELOC_HA16)
4001 word = ((unsigned short*) wordPtr)[1] << 16;
4002 word += ((short)relocs[i+1].r_address & (short)0xFFFF);
4006 word += (unsigned long) relocateAddress(oc, nSections, sections, scat->r_value)
4013 continue; // ignore the others
4015 #ifdef powerpc_HOST_ARCH
4016 if(scat->r_type == GENERIC_RELOC_VANILLA
4017 || scat->r_type == PPC_RELOC_SECTDIFF)
4019 if(scat->r_type == GENERIC_RELOC_VANILLA
4020 || scat->r_type == GENERIC_RELOC_SECTDIFF)
4025 #ifdef powerpc_HOST_ARCH
4026 else if(scat->r_type == PPC_RELOC_LO16_SECTDIFF || scat->r_type == PPC_RELOC_LO16)
4028 ((unsigned short*) wordPtr)[1] = word & 0xFFFF;
4030 else if(scat->r_type == PPC_RELOC_HI16_SECTDIFF || scat->r_type == PPC_RELOC_HI16)
4032 ((unsigned short*) wordPtr)[1] = (word >> 16) & 0xFFFF;
4034 else if(scat->r_type == PPC_RELOC_HA16_SECTDIFF || scat->r_type == PPC_RELOC_HA16)
4036 ((unsigned short*) wordPtr)[1] = ((word >> 16) & 0xFFFF)
4037 + ((word & (1<<15)) ? 1 : 0);
4043 continue; // FIXME: I hope it's OK to ignore all the others.
4047 struct relocation_info *reloc = &relocs[i];
4048 if(reloc->r_pcrel && !reloc->r_extern)
4051 if(reloc->r_length == 2)
4053 unsigned long word = 0;
4054 #ifdef powerpc_HOST_ARCH
4055 unsigned long jumpIsland = 0;
4056 long offsetToJumpIsland = 0xBADBAD42; // initialise to bad value
4057 // to avoid warning and to catch
4061 unsigned long* wordPtr = (unsigned long*) (image + sect->offset + reloc->r_address);
4062 checkProddableBlock(oc,wordPtr);
4064 if(reloc->r_type == GENERIC_RELOC_VANILLA)
4068 #ifdef powerpc_HOST_ARCH
4069 else if(reloc->r_type == PPC_RELOC_LO16)
4071 word = ((unsigned short*) wordPtr)[1];
4072 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
4074 else if(reloc->r_type == PPC_RELOC_HI16)
4076 word = ((unsigned short*) wordPtr)[1] << 16;
4077 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF);
4079 else if(reloc->r_type == PPC_RELOC_HA16)
4081 word = ((unsigned short*) wordPtr)[1] << 16;
4082 word += ((short)relocs[i+1].r_address & (short)0xFFFF);
4084 else if(reloc->r_type == PPC_RELOC_BR24)
4087 word = (word & 0x03FFFFFC) | ((word & 0x02000000) ? 0xFC000000 : 0);
4091 if(!reloc->r_extern)
4094 sections[reloc->r_symbolnum-1].offset
4095 - sections[reloc->r_symbolnum-1].addr
4102 struct nlist *symbol = &nlist[reloc->r_symbolnum];
4103 char *nm = image + symLC->stroff + symbol->n_un.n_strx;
4104 void *symbolAddress = lookupSymbol(nm);
4107 errorBelch("\nunknown symbol `%s'", nm);
4113 #ifdef powerpc_HOST_ARCH
4114 // In the .o file, this should be a relative jump to NULL
4115 // and we'll change it to a relative jump to the symbol
4116 ASSERT(-word == reloc->r_address);
4117 jumpIsland = makeJumpIsland(oc,reloc->r_symbolnum,(unsigned long) symbolAddress);
4120 offsetToJumpIsland = word + jumpIsland
4121 - (((long)image) + sect->offset - sect->addr);
4124 word += (unsigned long) symbolAddress
4125 - (((long)image) + sect->offset - sect->addr);
4129 word += (unsigned long) symbolAddress;
4133 if(reloc->r_type == GENERIC_RELOC_VANILLA)
4138 #ifdef powerpc_HOST_ARCH
4139 else if(reloc->r_type == PPC_RELOC_LO16)
4141 ((unsigned short*) wordPtr)[1] = word & 0xFFFF;
4144 else if(reloc->r_type == PPC_RELOC_HI16)
4146 ((unsigned short*) wordPtr)[1] = (word >> 16) & 0xFFFF;
4149 else if(reloc->r_type == PPC_RELOC_HA16)
4151 ((unsigned short*) wordPtr)[1] = ((word >> 16) & 0xFFFF)
4152 + ((word & (1<<15)) ? 1 : 0);
4155 else if(reloc->r_type == PPC_RELOC_BR24)
4157 if((long)word > (long)0x01FFFFFF || (long)word < (long)0xFFE00000)
4159 // The branch offset is too large.
4160 // Therefore, we try to use a jump island.
4163 barf("unconditional relative branch out of range: "
4164 "no jump island available");
4167 word = offsetToJumpIsland;
4168 if((long)word > (long)0x01FFFFFF || (long)word < (long)0xFFE00000)
4169 barf("unconditional relative branch out of range: "
4170 "jump island out of range");
4172 *wordPtr = (*wordPtr & 0xFC000003) | (word & 0x03FFFFFC);
4177 barf("\nunknown relocation %d",reloc->r_type);
4184 static int ocGetNames_MachO(ObjectCode* oc)
4186 char *image = (char*) oc->image;
4187 struct mach_header *header = (struct mach_header*) image;
4188 struct load_command *lc = (struct load_command*) (image + sizeof(struct mach_header));
4189 unsigned i,curSymbol = 0;
4190 struct segment_command *segLC = NULL;
4191 struct section *sections;
4192 struct symtab_command *symLC = NULL;
4193 struct nlist *nlist;
4194 unsigned long commonSize = 0;
4195 char *commonStorage = NULL;
4196 unsigned long commonCounter;
4198 for(i=0;i<header->ncmds;i++)
4200 if(lc->cmd == LC_SEGMENT)
4201 segLC = (struct segment_command*) lc;
4202 else if(lc->cmd == LC_SYMTAB)
4203 symLC = (struct symtab_command*) lc;
4204 lc = (struct load_command *) ( ((char*)lc) + lc->cmdsize );
4207 sections = (struct section*) (segLC+1);
4208 nlist = symLC ? (struct nlist*) (image + symLC->symoff)
4211 for(i=0;i<segLC->nsects;i++)
4213 if(sections[i].size == 0)
4216 if((sections[i].flags & SECTION_TYPE) == S_ZEROFILL)
4218 char * zeroFillArea = stgCallocBytes(1,sections[i].size,
4219 "ocGetNames_MachO(common symbols)");
4220 sections[i].offset = zeroFillArea - image;
4223 if(!strcmp(sections[i].sectname,"__text"))
4224 addSection(oc, SECTIONKIND_CODE_OR_RODATA,
4225 (void*) (image + sections[i].offset),
4226 (void*) (image + sections[i].offset + sections[i].size));
4227 else if(!strcmp(sections[i].sectname,"__const"))
4228 addSection(oc, SECTIONKIND_RWDATA,
4229 (void*) (image + sections[i].offset),
4230 (void*) (image + sections[i].offset + sections[i].size));
4231 else if(!strcmp(sections[i].sectname,"__data"))
4232 addSection(oc, SECTIONKIND_RWDATA,
4233 (void*) (image + sections[i].offset),
4234 (void*) (image + sections[i].offset + sections[i].size));
4235 else if(!strcmp(sections[i].sectname,"__bss")
4236 || !strcmp(sections[i].sectname,"__common"))
4237 addSection(oc, SECTIONKIND_RWDATA,
4238 (void*) (image + sections[i].offset),
4239 (void*) (image + sections[i].offset + sections[i].size));
4241 addProddableBlock(oc, (void*) (image + sections[i].offset),
4245 // count external symbols defined here
4249 for(i=0;i<symLC->nsyms;i++)
4251 if(nlist[i].n_type & N_STAB)
4253 else if(nlist[i].n_type & N_EXT)
4255 if((nlist[i].n_type & N_TYPE) == N_UNDF
4256 && (nlist[i].n_value != 0))
4258 commonSize += nlist[i].n_value;
4261 else if((nlist[i].n_type & N_TYPE) == N_SECT)
4266 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
4267 "ocGetNames_MachO(oc->symbols)");
4271 for(i=0;i<symLC->nsyms;i++)
4273 if(nlist[i].n_type & N_STAB)
4275 else if((nlist[i].n_type & N_TYPE) == N_SECT)
4277 if(nlist[i].n_type & N_EXT)
4279 char *nm = image + symLC->stroff + nlist[i].n_un.n_strx;
4280 ghciInsertStrHashTable(oc->fileName, symhash, nm,
4282 + sections[nlist[i].n_sect-1].offset
4283 - sections[nlist[i].n_sect-1].addr
4284 + nlist[i].n_value);
4285 oc->symbols[curSymbol++] = nm;
4289 char *nm = image + symLC->stroff + nlist[i].n_un.n_strx;
4290 ghciInsertStrHashTable(oc->fileName, oc->lochash, nm,
4292 + sections[nlist[i].n_sect-1].offset
4293 - sections[nlist[i].n_sect-1].addr
4294 + nlist[i].n_value);
4300 commonStorage = stgCallocBytes(1,commonSize,"ocGetNames_MachO(common symbols)");
4301 commonCounter = (unsigned long)commonStorage;
4304 for(i=0;i<symLC->nsyms;i++)
4306 if((nlist[i].n_type & N_TYPE) == N_UNDF
4307 && (nlist[i].n_type & N_EXT) && (nlist[i].n_value != 0))
4309 char *nm = image + symLC->stroff + nlist[i].n_un.n_strx;
4310 unsigned long sz = nlist[i].n_value;
4312 nlist[i].n_value = commonCounter;
4314 ghciInsertStrHashTable(oc->fileName, symhash, nm,
4315 (void*)commonCounter);
4316 oc->symbols[curSymbol++] = nm;
4318 commonCounter += sz;
4325 static int ocResolve_MachO(ObjectCode* oc)
4327 char *image = (char*) oc->image;
4328 struct mach_header *header = (struct mach_header*) image;
4329 struct load_command *lc = (struct load_command*) (image + sizeof(struct mach_header));
4331 struct segment_command *segLC = NULL;
4332 struct section *sections;
4333 struct symtab_command *symLC = NULL;
4334 struct dysymtab_command *dsymLC = NULL;
4335 struct nlist *nlist;
4337 for(i=0;i<header->ncmds;i++)
4339 if(lc->cmd == LC_SEGMENT)
4340 segLC = (struct segment_command*) lc;
4341 else if(lc->cmd == LC_SYMTAB)
4342 symLC = (struct symtab_command*) lc;
4343 else if(lc->cmd == LC_DYSYMTAB)
4344 dsymLC = (struct dysymtab_command*) lc;
4345 lc = (struct load_command *) ( ((char*)lc) + lc->cmdsize );
4348 sections = (struct section*) (segLC+1);
4349 nlist = symLC ? (struct nlist*) (image + symLC->symoff)
4354 unsigned long *indirectSyms
4355 = (unsigned long*) (image + dsymLC->indirectsymoff);
4357 for(i=0;i<segLC->nsects;i++)
4359 if( !strcmp(sections[i].sectname,"__la_symbol_ptr")
4360 || !strcmp(sections[i].sectname,"__la_sym_ptr2")
4361 || !strcmp(sections[i].sectname,"__la_sym_ptr3"))
4363 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4366 else if(!strcmp(sections[i].sectname,"__nl_symbol_ptr")
4367 || !strcmp(sections[i].sectname,"__pointers"))
4369 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4372 else if(!strcmp(sections[i].sectname,"__jump_table"))
4374 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4380 for(i=0;i<segLC->nsects;i++)
4382 if(!relocateSection(oc,image,symLC,nlist,segLC->nsects,sections,§ions[i]))
4386 /* Free the local symbol table; we won't need it again. */
4387 freeHashTable(oc->lochash, NULL);
4390 #if defined (powerpc_HOST_ARCH)
4391 ocFlushInstructionCache( oc );
4397 #ifdef powerpc_HOST_ARCH
4399 * The Mach-O object format uses leading underscores. But not everywhere.
4400 * There is a small number of runtime support functions defined in
4401 * libcc_dynamic.a whose name does not have a leading underscore.
4402 * As a consequence, we can't get their address from C code.
4403 * We have to use inline assembler just to take the address of a function.
4407 static void machoInitSymbolsWithoutUnderscore()
4409 extern void* symbolsWithoutUnderscore[];
4410 void **p = symbolsWithoutUnderscore;
4411 __asm__ volatile(".globl _symbolsWithoutUnderscore\n.data\n_symbolsWithoutUnderscore:");
4415 __asm__ volatile(".long " # x);
4417 RTS_MACHO_NOUNDERLINE_SYMBOLS
4419 __asm__ volatile(".text");
4423 ghciInsertStrHashTable("(GHCi built-in symbols)", symhash, #x, *p++);
4425 RTS_MACHO_NOUNDERLINE_SYMBOLS
4432 * Figure out by how much to shift the entire Mach-O file in memory
4433 * when loading so that its single segment ends up 16-byte-aligned
4435 static int machoGetMisalignment( FILE * f )
4437 struct mach_header header;
4440 fread(&header, sizeof(header), 1, f);
4443 if(header.magic != MH_MAGIC)
4446 misalignment = (header.sizeofcmds + sizeof(header))
4449 return misalignment ? (16 - misalignment) : 0;