1 /* -----------------------------------------------------------------------------
3 * (c) The GHC Team, 2000-2004
7 * ---------------------------------------------------------------------------*/
10 #include "PosixSource.h"
13 /* Linux needs _GNU_SOURCE to get RTLD_DEFAULT from <dlfcn.h> and
14 MREMAP_MAYMOVE from <sys/mman.h>.
25 #include "LinkerInternals.h"
31 #ifdef HAVE_SYS_TYPES_H
32 #include <sys/types.h>
38 #ifdef HAVE_SYS_STAT_H
42 #if defined(HAVE_DLFCN_H)
46 #if defined(cygwin32_HOST_OS)
51 #ifdef HAVE_SYS_TIME_H
55 #include <sys/fcntl.h>
56 #include <sys/termios.h>
57 #include <sys/utime.h>
58 #include <sys/utsname.h>
62 #if defined(ia64_HOST_ARCH) || defined(openbsd_HOST_OS) || defined(linux_HOST_OS) || defined(freebsd_HOST_OS)
67 #if defined(openbsd_HOST_OS) || defined(linux_HOST_OS) || defined(freebsd_HOST_OS)
75 #if defined(linux_HOST_OS) || defined(solaris2_HOST_OS) || defined(freebsd_HOST_OS) || defined(netbsd_HOST_OS) || defined(openbsd_HOST_OS)
76 # define OBJFORMAT_ELF
77 #elif defined(cygwin32_HOST_OS) || defined (mingw32_HOST_OS)
78 # define OBJFORMAT_PEi386
81 #elif defined(darwin_HOST_OS)
82 # define OBJFORMAT_MACHO
83 # include <mach-o/loader.h>
84 # include <mach-o/nlist.h>
85 # include <mach-o/reloc.h>
86 # include <mach-o/dyld.h>
87 #if defined(powerpc_HOST_ARCH)
88 # include <mach-o/ppc/reloc.h>
92 /* Hash table mapping symbol names to Symbol */
93 static /*Str*/HashTable *symhash;
99 /* Hash table mapping symbol names to StgStablePtr */
100 static /*Str*/HashTable *stablehash;
101 rootEntry *root_ptr_table = NULL;
102 static rootEntry *root_ptr_free = NULL;
104 static unsigned int RPT_size = 0;
106 /* List of currently loaded objects */
107 ObjectCode *objects = NULL; /* initially empty */
109 #if defined(OBJFORMAT_ELF)
110 static int ocVerifyImage_ELF ( ObjectCode* oc );
111 static int ocGetNames_ELF ( ObjectCode* oc );
112 static int ocResolve_ELF ( ObjectCode* oc );
113 #if defined(powerpc_HOST_ARCH)
114 static int ocAllocateJumpIslands_ELF ( ObjectCode* oc );
116 #elif defined(OBJFORMAT_PEi386)
117 static int ocVerifyImage_PEi386 ( ObjectCode* oc );
118 static int ocGetNames_PEi386 ( ObjectCode* oc );
119 static int ocResolve_PEi386 ( ObjectCode* oc );
120 #elif defined(OBJFORMAT_MACHO)
121 static int ocVerifyImage_MachO ( ObjectCode* oc );
122 static int ocGetNames_MachO ( ObjectCode* oc );
123 static int ocResolve_MachO ( ObjectCode* oc );
125 static int machoGetMisalignment( FILE * );
126 #ifdef powerpc_HOST_ARCH
127 static int ocAllocateJumpIslands_MachO ( ObjectCode* oc );
128 static void machoInitSymbolsWithoutUnderscore( void );
132 #if defined(x86_64_HOST_ARCH)
133 static void*x86_64_high_symbol( char *lbl, void *addr );
136 /* -----------------------------------------------------------------------------
137 * Built-in symbols from the RTS
140 typedef struct _RtsSymbolVal {
147 #define Maybe_Stable_Names SymX(mkWeakzh_fast) \
148 SymX(makeStableNamezh_fast) \
149 SymX(finalizzeWeakzh_fast)
151 /* These are not available in GUM!!! -- HWL */
152 #define Maybe_Stable_Names
155 #if !defined (mingw32_HOST_OS)
156 #define RTS_POSIX_ONLY_SYMBOLS \
157 SymX(signal_handlers) \
158 SymX(stg_sig_install) \
162 #if defined (cygwin32_HOST_OS)
163 #define RTS_MINGW_ONLY_SYMBOLS /**/
164 /* Don't have the ability to read import libs / archives, so
165 * we have to stupidly list a lot of what libcygwin.a
168 #define RTS_CYGWIN_ONLY_SYMBOLS \
246 #elif !defined(mingw32_HOST_OS)
247 #define RTS_MINGW_ONLY_SYMBOLS /**/
248 #define RTS_CYGWIN_ONLY_SYMBOLS /**/
249 #else /* defined(mingw32_HOST_OS) */
250 #define RTS_POSIX_ONLY_SYMBOLS /**/
251 #define RTS_CYGWIN_ONLY_SYMBOLS /**/
253 /* Extra syms gen'ed by mingw-2's gcc-3.2: */
255 #define RTS_MINGW_EXTRA_SYMS \
256 Sym(_imp____mb_cur_max) \
259 #define RTS_MINGW_EXTRA_SYMS
262 /* These are statically linked from the mingw libraries into the ghc
263 executable, so we have to employ this hack. */
264 #define RTS_MINGW_ONLY_SYMBOLS \
265 SymX(asyncReadzh_fast) \
266 SymX(asyncWritezh_fast) \
267 SymX(asyncDoProczh_fast) \
279 SymX(getservbyname) \
280 SymX(getservbyport) \
281 SymX(getprotobynumber) \
282 SymX(getprotobyname) \
283 SymX(gethostbyname) \
284 SymX(gethostbyaddr) \
331 SymX(rts_InstallConsoleEvent) \
332 SymX(rts_ConsoleHandlerDone) \
334 Sym(_imp___timezone) \
344 RTS_MINGW_EXTRA_SYMS \
348 #if defined(darwin_TARGET_OS) && HAVE_PRINTF_LDBLSTUB
349 #define RTS_DARWIN_ONLY_SYMBOLS \
350 Sym(asprintf$LDBLStub) \
354 Sym(fprintf$LDBLStub) \
355 Sym(fscanf$LDBLStub) \
356 Sym(fwprintf$LDBLStub) \
357 Sym(fwscanf$LDBLStub) \
358 Sym(printf$LDBLStub) \
359 Sym(scanf$LDBLStub) \
360 Sym(snprintf$LDBLStub) \
361 Sym(sprintf$LDBLStub) \
362 Sym(sscanf$LDBLStub) \
363 Sym(strtold$LDBLStub) \
364 Sym(swprintf$LDBLStub) \
365 Sym(swscanf$LDBLStub) \
366 Sym(syslog$LDBLStub) \
367 Sym(vasprintf$LDBLStub) \
369 Sym(verrc$LDBLStub) \
370 Sym(verrx$LDBLStub) \
371 Sym(vfprintf$LDBLStub) \
372 Sym(vfscanf$LDBLStub) \
373 Sym(vfwprintf$LDBLStub) \
374 Sym(vfwscanf$LDBLStub) \
375 Sym(vprintf$LDBLStub) \
376 Sym(vscanf$LDBLStub) \
377 Sym(vsnprintf$LDBLStub) \
378 Sym(vsprintf$LDBLStub) \
379 Sym(vsscanf$LDBLStub) \
380 Sym(vswprintf$LDBLStub) \
381 Sym(vswscanf$LDBLStub) \
382 Sym(vsyslog$LDBLStub) \
383 Sym(vwarn$LDBLStub) \
384 Sym(vwarnc$LDBLStub) \
385 Sym(vwarnx$LDBLStub) \
386 Sym(vwprintf$LDBLStub) \
387 Sym(vwscanf$LDBLStub) \
389 Sym(warnc$LDBLStub) \
390 Sym(warnx$LDBLStub) \
391 Sym(wcstold$LDBLStub) \
392 Sym(wprintf$LDBLStub) \
395 #define RTS_DARWIN_ONLY_SYMBOLS
399 # define MAIN_CAP_SYM SymX(MainCapability)
401 # define MAIN_CAP_SYM
404 #if !defined(mingw32_HOST_OS)
405 #define RTS_USER_SIGNALS_SYMBOLS \
406 SymX(setIOManagerPipe)
408 #define RTS_USER_SIGNALS_SYMBOLS /* nothing */
411 #ifdef TABLES_NEXT_TO_CODE
412 #define RTS_RET_SYMBOLS /* nothing */
414 #define RTS_RET_SYMBOLS \
415 SymX(stg_enter_ret) \
416 SymX(stg_gc_fun_ret) \
423 SymX(stg_ap_pv_ret) \
424 SymX(stg_ap_pp_ret) \
425 SymX(stg_ap_ppv_ret) \
426 SymX(stg_ap_ppp_ret) \
427 SymX(stg_ap_pppv_ret) \
428 SymX(stg_ap_pppp_ret) \
429 SymX(stg_ap_ppppp_ret) \
430 SymX(stg_ap_pppppp_ret)
433 #define RTS_SYMBOLS \
436 SymX(stg_enter_info) \
437 SymX(stg_gc_void_info) \
438 SymX(__stg_gc_enter_1) \
439 SymX(stg_gc_noregs) \
440 SymX(stg_gc_unpt_r1_info) \
441 SymX(stg_gc_unpt_r1) \
442 SymX(stg_gc_unbx_r1_info) \
443 SymX(stg_gc_unbx_r1) \
444 SymX(stg_gc_f1_info) \
446 SymX(stg_gc_d1_info) \
448 SymX(stg_gc_l1_info) \
451 SymX(stg_gc_fun_info) \
453 SymX(stg_gc_gen_info) \
454 SymX(stg_gc_gen_hp) \
456 SymX(stg_gen_yield) \
457 SymX(stg_yield_noregs) \
458 SymX(stg_yield_to_interpreter) \
459 SymX(stg_gen_block) \
460 SymX(stg_block_noregs) \
462 SymX(stg_block_takemvar) \
463 SymX(stg_block_putmvar) \
464 SymX(stg_seq_frame_info) \
466 SymX(MallocFailHook) \
468 SymX(OutOfHeapHook) \
469 SymX(StackOverflowHook) \
470 SymX(__encodeDouble) \
471 SymX(__encodeFloat) \
475 SymX(__gmpz_cmp_si) \
476 SymX(__gmpz_cmp_ui) \
477 SymX(__gmpz_get_si) \
478 SymX(__gmpz_get_ui) \
479 SymX(__int_encodeDouble) \
480 SymX(__int_encodeFloat) \
481 SymX(andIntegerzh_fast) \
482 SymX(atomicallyzh_fast) \
486 SymX(blockAsyncExceptionszh_fast) \
488 SymX(catchRetryzh_fast) \
489 SymX(catchSTMzh_fast) \
490 SymX(closure_flags) \
492 SymX(cmpIntegerzh_fast) \
493 SymX(cmpIntegerIntzh_fast) \
494 SymX(complementIntegerzh_fast) \
495 SymX(createAdjustor) \
496 SymX(decodeDoublezh_fast) \
497 SymX(decodeFloatzh_fast) \
500 SymX(deRefWeakzh_fast) \
501 SymX(deRefStablePtrzh_fast) \
502 SymX(dirty_MUT_VAR) \
503 SymX(divExactIntegerzh_fast) \
504 SymX(divModIntegerzh_fast) \
506 SymX(forkOnzh_fast) \
508 SymX(forkOS_createThread) \
509 SymX(freeHaskellFunctionPtr) \
510 SymX(freeStablePtr) \
511 SymX(gcdIntegerzh_fast) \
512 SymX(gcdIntegerIntzh_fast) \
513 SymX(gcdIntzh_fast) \
522 SymX(hs_perform_gc) \
523 SymX(hs_free_stable_ptr) \
524 SymX(hs_free_fun_ptr) \
526 SymX(int2Integerzh_fast) \
527 SymX(integer2Intzh_fast) \
528 SymX(integer2Wordzh_fast) \
529 SymX(isCurrentThreadBoundzh_fast) \
530 SymX(isDoubleDenormalized) \
531 SymX(isDoubleInfinite) \
533 SymX(isDoubleNegativeZero) \
534 SymX(isEmptyMVarzh_fast) \
535 SymX(isFloatDenormalized) \
536 SymX(isFloatInfinite) \
538 SymX(isFloatNegativeZero) \
539 SymX(killThreadzh_fast) \
541 SymX(insertStableSymbol) \
544 SymX(makeStablePtrzh_fast) \
545 SymX(minusIntegerzh_fast) \
546 SymX(mkApUpd0zh_fast) \
547 SymX(myThreadIdzh_fast) \
548 SymX(labelThreadzh_fast) \
549 SymX(newArrayzh_fast) \
550 SymX(newBCOzh_fast) \
551 SymX(newByteArrayzh_fast) \
552 SymX_redirect(newCAF, newDynCAF) \
553 SymX(newMVarzh_fast) \
554 SymX(newMutVarzh_fast) \
555 SymX(newTVarzh_fast) \
556 SymX(atomicModifyMutVarzh_fast) \
557 SymX(newPinnedByteArrayzh_fast) \
559 SymX(orIntegerzh_fast) \
561 SymX(performMajorGC) \
562 SymX(plusIntegerzh_fast) \
565 SymX(putMVarzh_fast) \
566 SymX(quotIntegerzh_fast) \
567 SymX(quotRemIntegerzh_fast) \
569 SymX(raiseIOzh_fast) \
570 SymX(readTVarzh_fast) \
571 SymX(remIntegerzh_fast) \
572 SymX(resetNonBlockingFd) \
577 SymX(rts_checkSchedStatus) \
580 SymX(rts_evalLazyIO) \
581 SymX(rts_evalStableIO) \
585 SymX(rts_getDouble) \
590 SymX(rts_getFunPtr) \
591 SymX(rts_getStablePtr) \
592 SymX(rts_getThreadId) \
594 SymX(rts_getWord32) \
607 SymX(rts_mkStablePtr) \
615 SymX(rtsSupportsBoundThreads) \
616 SymX(__hscore_get_saved_termios) \
617 SymX(__hscore_set_saved_termios) \
619 SymX(startupHaskell) \
620 SymX(shutdownHaskell) \
621 SymX(shutdownHaskellAndExit) \
622 SymX(stable_ptr_table) \
623 SymX(stackOverflow) \
624 SymX(stg_CAF_BLACKHOLE_info) \
625 SymX(awakenBlockedQueue) \
626 SymX(stg_CHARLIKE_closure) \
627 SymX(stg_EMPTY_MVAR_info) \
628 SymX(stg_IND_STATIC_info) \
629 SymX(stg_INTLIKE_closure) \
630 SymX(stg_MUT_ARR_PTRS_DIRTY_info) \
631 SymX(stg_MUT_ARR_PTRS_FROZEN_info) \
632 SymX(stg_MUT_ARR_PTRS_FROZEN0_info) \
633 SymX(stg_WEAK_info) \
634 SymX(stg_ap_v_info) \
635 SymX(stg_ap_f_info) \
636 SymX(stg_ap_d_info) \
637 SymX(stg_ap_l_info) \
638 SymX(stg_ap_n_info) \
639 SymX(stg_ap_p_info) \
640 SymX(stg_ap_pv_info) \
641 SymX(stg_ap_pp_info) \
642 SymX(stg_ap_ppv_info) \
643 SymX(stg_ap_ppp_info) \
644 SymX(stg_ap_pppv_info) \
645 SymX(stg_ap_pppp_info) \
646 SymX(stg_ap_ppppp_info) \
647 SymX(stg_ap_pppppp_info) \
648 SymX(stg_ap_0_fast) \
649 SymX(stg_ap_v_fast) \
650 SymX(stg_ap_f_fast) \
651 SymX(stg_ap_d_fast) \
652 SymX(stg_ap_l_fast) \
653 SymX(stg_ap_n_fast) \
654 SymX(stg_ap_p_fast) \
655 SymX(stg_ap_pv_fast) \
656 SymX(stg_ap_pp_fast) \
657 SymX(stg_ap_ppv_fast) \
658 SymX(stg_ap_ppp_fast) \
659 SymX(stg_ap_pppv_fast) \
660 SymX(stg_ap_pppp_fast) \
661 SymX(stg_ap_ppppp_fast) \
662 SymX(stg_ap_pppppp_fast) \
663 SymX(stg_ap_1_upd_info) \
664 SymX(stg_ap_2_upd_info) \
665 SymX(stg_ap_3_upd_info) \
666 SymX(stg_ap_4_upd_info) \
667 SymX(stg_ap_5_upd_info) \
668 SymX(stg_ap_6_upd_info) \
669 SymX(stg_ap_7_upd_info) \
671 SymX(stg_sel_0_upd_info) \
672 SymX(stg_sel_10_upd_info) \
673 SymX(stg_sel_11_upd_info) \
674 SymX(stg_sel_12_upd_info) \
675 SymX(stg_sel_13_upd_info) \
676 SymX(stg_sel_14_upd_info) \
677 SymX(stg_sel_15_upd_info) \
678 SymX(stg_sel_1_upd_info) \
679 SymX(stg_sel_2_upd_info) \
680 SymX(stg_sel_3_upd_info) \
681 SymX(stg_sel_4_upd_info) \
682 SymX(stg_sel_5_upd_info) \
683 SymX(stg_sel_6_upd_info) \
684 SymX(stg_sel_7_upd_info) \
685 SymX(stg_sel_8_upd_info) \
686 SymX(stg_sel_9_upd_info) \
687 SymX(stg_upd_frame_info) \
688 SymX(suspendThread) \
689 SymX(takeMVarzh_fast) \
690 SymX(timesIntegerzh_fast) \
691 SymX(tryPutMVarzh_fast) \
692 SymX(tryTakeMVarzh_fast) \
693 SymX(unblockAsyncExceptionszh_fast) \
695 SymX(unsafeThawArrayzh_fast) \
696 SymX(waitReadzh_fast) \
697 SymX(waitWritezh_fast) \
698 SymX(word2Integerzh_fast) \
699 SymX(writeTVarzh_fast) \
700 SymX(xorIntegerzh_fast) \
702 SymX(stg_interp_constr_entry) \
703 SymX(stg_interp_constr1_entry) \
704 SymX(stg_interp_constr2_entry) \
705 SymX(stg_interp_constr3_entry) \
706 SymX(stg_interp_constr4_entry) \
707 SymX(stg_interp_constr5_entry) \
708 SymX(stg_interp_constr6_entry) \
709 SymX(stg_interp_constr7_entry) \
710 SymX(stg_interp_constr8_entry) \
713 SymX(getAllocations) \
716 RTS_USER_SIGNALS_SYMBOLS
718 #ifdef SUPPORT_LONG_LONGS
719 #define RTS_LONG_LONG_SYMS \
720 SymX(int64ToIntegerzh_fast) \
721 SymX(word64ToIntegerzh_fast)
723 #define RTS_LONG_LONG_SYMS /* nothing */
726 // 64-bit support functions in libgcc.a
727 #if defined(__GNUC__) && SIZEOF_VOID_P <= 4
728 #define RTS_LIBGCC_SYMBOLS \
738 #elif defined(ia64_HOST_ARCH)
739 #define RTS_LIBGCC_SYMBOLS \
747 #define RTS_LIBGCC_SYMBOLS
750 #if defined(darwin_HOST_OS) && defined(powerpc_HOST_ARCH)
751 // Symbols that don't have a leading underscore
752 // on Mac OS X. They have to receive special treatment,
753 // see machoInitSymbolsWithoutUnderscore()
754 #define RTS_MACHO_NOUNDERLINE_SYMBOLS \
759 /* entirely bogus claims about types of these symbols */
760 #define Sym(vvv) extern void vvv(void);
761 #define SymX(vvv) /**/
762 #define SymX_redirect(vvv,xxx) /**/
766 RTS_POSIX_ONLY_SYMBOLS
767 RTS_MINGW_ONLY_SYMBOLS
768 RTS_CYGWIN_ONLY_SYMBOLS
769 RTS_DARWIN_ONLY_SYMBOLS
775 #ifdef LEADING_UNDERSCORE
776 #define MAYBE_LEADING_UNDERSCORE_STR(s) ("_" s)
778 #define MAYBE_LEADING_UNDERSCORE_STR(s) (s)
781 #define Sym(vvv) { MAYBE_LEADING_UNDERSCORE_STR(#vvv), \
783 #define SymX(vvv) Sym(vvv)
785 // SymX_redirect allows us to redirect references to one symbol to
786 // another symbol. See newCAF/newDynCAF for an example.
787 #define SymX_redirect(vvv,xxx) \
788 { MAYBE_LEADING_UNDERSCORE_STR(#vvv), \
791 static RtsSymbolVal rtsSyms[] = {
795 RTS_POSIX_ONLY_SYMBOLS
796 RTS_MINGW_ONLY_SYMBOLS
797 RTS_CYGWIN_ONLY_SYMBOLS
799 #if defined(darwin_HOST_OS) && defined(i386_HOST_ARCH)
800 // dyld stub code contains references to this,
801 // but it should never be called because we treat
802 // lazy pointers as nonlazy.
803 { "dyld_stub_binding_helper", (void*)0xDEADBEEF },
805 { 0, 0 } /* sentinel */
809 /* -----------------------------------------------------------------------------
810 * Utilities for handling root pointers.
811 * -------------------------------------------------------------------------- */
814 #define INIT_RPT_SIZE 64
817 initFreeList(rootEntry *table, nat n, rootEntry *free)
821 for (p = table + n - 1; p >= table; p--) {
825 root_ptr_free = table;
829 initRootPtrTable(void)
834 RPT_size = INIT_RPT_SIZE;
835 root_ptr_table = stgMallocBytes(RPT_size * sizeof(rootEntry),
838 initFreeList(root_ptr_table,INIT_RPT_SIZE,NULL);
843 enlargeRootPtrTable(void)
845 nat old_RPT_size = RPT_size;
847 // 2nd and subsequent times
850 stgReallocBytes(root_ptr_table,
851 RPT_size * sizeof(rootEntry),
852 "enlargeRootPtrTable");
854 initFreeList(root_ptr_table + old_RPT_size, old_RPT_size, NULL);
858 addRootObject(void *addr)
862 if (root_ptr_free == NULL) {
863 enlargeRootPtrTable();
866 rt = root_ptr_free - root_ptr_table;
867 root_ptr_free = (rootEntry*)(root_ptr_free->addr);
868 root_ptr_table[rt].addr = addr;
871 /* -----------------------------------------------------------------------------
872 * Treat root pointers as roots for the garbage collector.
873 * -------------------------------------------------------------------------- */
876 markRootPtrTable(evac_fn evac)
878 rootEntry *p, *end_root_ptr_table;
881 end_root_ptr_table = &root_ptr_table[RPT_size];
883 for (p = root_ptr_table; p < end_root_ptr_table; p++) {
886 if (q && (q < (P_)root_ptr_table || q >= (P_)end_root_ptr_table)) {
887 evac((StgClosure **)p->addr);
892 /* -----------------------------------------------------------------------------
893 * End of utilities for handling root pointers.
894 * -------------------------------------------------------------------------- */
897 /* -----------------------------------------------------------------------------
898 * Insert symbols into hash tables, checking for duplicates.
900 static void ghciInsertStrHashTable ( char* obj_name,
906 if (lookupHashTable(table, (StgWord)key) == NULL)
908 insertStrHashTable(table, (StgWord)key, data);
913 "GHCi runtime linker: fatal error: I found a duplicate definition for symbol\n"
915 "whilst processing object file\n"
917 "This could be caused by:\n"
918 " * Loading two different object files which export the same symbol\n"
919 " * Specifying the same object file twice on the GHCi command line\n"
920 " * An incorrect `package.conf' entry, causing some object to be\n"
922 "GHCi cannot safely continue in this situation. Exiting now. Sorry.\n"
931 /* -----------------------------------------------------------------------------
932 * initialize the object linker
936 static int linker_init_done = 0 ;
938 #if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
939 static void *dl_prog_handle;
942 /* dlopen(NULL,..) doesn't work so we grab libc explicitly */
943 #if defined(openbsd_HOST_OS)
944 static void *dl_libc_handle;
952 /* Make initLinker idempotent, so we can call it
953 before evey relevant operation; that means we
954 don't need to initialise the linker separately */
955 if (linker_init_done == 1) { return; } else {
956 linker_init_done = 1;
959 stablehash = allocStrHashTable();
960 symhash = allocStrHashTable();
962 /* populate the symbol table with stuff from the RTS */
963 for (sym = rtsSyms; sym->lbl != NULL; sym++) {
964 ghciInsertStrHashTable("(GHCi built-in symbols)",
965 symhash, sym->lbl, sym->addr);
967 # if defined(OBJFORMAT_MACHO) && defined(powerpc_HOST_ARCH)
968 machoInitSymbolsWithoutUnderscore();
971 # if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
972 # if defined(RTLD_DEFAULT)
973 dl_prog_handle = RTLD_DEFAULT;
975 dl_prog_handle = dlopen(NULL, RTLD_LAZY);
976 # if defined(openbsd_HOST_OS)
977 dl_libc_handle = dlopen("libc.so", RTLD_LAZY);
979 # endif /* RTLD_DEFAULT */
983 /* -----------------------------------------------------------------------------
984 * Loading DLL or .so dynamic libraries
985 * -----------------------------------------------------------------------------
987 * Add a DLL from which symbols may be found. In the ELF case, just
988 * do RTLD_GLOBAL-style add, so no further messing around needs to
989 * happen in order that symbols in the loaded .so are findable --
990 * lookupSymbol() will subsequently see them by dlsym on the program's
991 * dl-handle. Returns NULL if success, otherwise ptr to an err msg.
993 * In the PEi386 case, open the DLLs and put handles to them in a
994 * linked list. When looking for a symbol, try all handles in the
995 * list. This means that we need to load even DLLs that are guaranteed
996 * to be in the ghc.exe image already, just so we can get a handle
997 * to give to loadSymbol, so that we can find the symbols. For such
998 * libraries, the LoadLibrary call should be a no-op except for returning
1003 #if defined(OBJFORMAT_PEi386)
1004 /* A record for storing handles into DLLs. */
1009 struct _OpenedDLL* next;
1014 /* A list thereof. */
1015 static OpenedDLL* opened_dlls = NULL;
1019 addDLL( char *dll_name )
1021 # if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
1022 /* ------------------- ELF DLL loader ------------------- */
1028 hdl= dlopen(dll_name, RTLD_NOW | RTLD_GLOBAL);
1031 /* dlopen failed; return a ptr to the error msg. */
1033 if (errmsg == NULL) errmsg = "addDLL: unknown error";
1040 # elif defined(OBJFORMAT_PEi386)
1041 /* ------------------- Win32 DLL loader ------------------- */
1049 /* debugBelch("\naddDLL; dll_name = `%s'\n", dll_name); */
1051 /* See if we've already got it, and ignore if so. */
1052 for (o_dll = opened_dlls; o_dll != NULL; o_dll = o_dll->next) {
1053 if (0 == strcmp(o_dll->name, dll_name))
1057 /* The file name has no suffix (yet) so that we can try
1058 both foo.dll and foo.drv
1060 The documentation for LoadLibrary says:
1061 If no file name extension is specified in the lpFileName
1062 parameter, the default library extension .dll is
1063 appended. However, the file name string can include a trailing
1064 point character (.) to indicate that the module name has no
1067 buf = stgMallocBytes(strlen(dll_name) + 10, "addDLL");
1068 sprintf(buf, "%s.DLL", dll_name);
1069 instance = LoadLibrary(buf);
1070 if (instance == NULL) {
1071 sprintf(buf, "%s.DRV", dll_name); // KAA: allow loading of drivers (like winspool.drv)
1072 instance = LoadLibrary(buf);
1073 if (instance == NULL) {
1076 /* LoadLibrary failed; return a ptr to the error msg. */
1077 return "addDLL: unknown error";
1082 /* Add this DLL to the list of DLLs in which to search for symbols. */
1083 o_dll = stgMallocBytes( sizeof(OpenedDLL), "addDLL" );
1084 o_dll->name = stgMallocBytes(1+strlen(dll_name), "addDLL");
1085 strcpy(o_dll->name, dll_name);
1086 o_dll->instance = instance;
1087 o_dll->next = opened_dlls;
1088 opened_dlls = o_dll;
1092 barf("addDLL: not implemented on this platform");
1096 /* -----------------------------------------------------------------------------
1097 * insert a stable symbol in the hash table
1101 insertStableSymbol(char* obj_name, char* key, StgPtr p)
1103 ghciInsertStrHashTable(obj_name, stablehash, key, getStablePtr(p));
1107 /* -----------------------------------------------------------------------------
1108 * insert a symbol in the hash table
1111 insertSymbol(char* obj_name, char* key, void* data)
1113 ghciInsertStrHashTable(obj_name, symhash, key, data);
1116 /* -----------------------------------------------------------------------------
1117 * lookup a symbol in the hash table
1120 lookupSymbol( char *lbl )
1124 ASSERT(symhash != NULL);
1125 val = lookupStrHashTable(symhash, lbl);
1128 # if defined(OBJFORMAT_ELF)
1129 # if defined(openbsd_HOST_OS)
1130 val = dlsym(dl_prog_handle, lbl);
1131 return (val != NULL) ? val : dlsym(dl_libc_handle,lbl);
1132 # elif defined(x86_64_HOST_ARCH)
1133 val = dlsym(dl_prog_handle, lbl);
1134 if (val >= (void *)0x80000000) {
1136 new_val = x86_64_high_symbol(lbl, val);
1137 IF_DEBUG(linker,debugBelch("lookupSymbol: relocating out of range symbol: %s = %p, now %p\n", lbl, val, new_val));
1142 # else /* not openbsd */
1143 return dlsym(dl_prog_handle, lbl);
1145 # elif defined(OBJFORMAT_MACHO)
1146 if(NSIsSymbolNameDefined(lbl)) {
1147 NSSymbol symbol = NSLookupAndBindSymbol(lbl);
1148 return NSAddressOfSymbol(symbol);
1152 # elif defined(OBJFORMAT_PEi386)
1155 for (o_dll = opened_dlls; o_dll != NULL; o_dll = o_dll->next) {
1156 /* debugBelch("look in %s for %s\n", o_dll->name, lbl); */
1157 if (lbl[0] == '_') {
1158 /* HACK: if the name has an initial underscore, try stripping
1159 it off & look that up first. I've yet to verify whether there's
1160 a Rule that governs whether an initial '_' *should always* be
1161 stripped off when mapping from import lib name to the DLL name.
1163 sym = GetProcAddress(o_dll->instance, (lbl+1));
1165 /*debugBelch("found %s in %s\n", lbl+1,o_dll->name);*/
1169 sym = GetProcAddress(o_dll->instance, lbl);
1171 /*debugBelch("found %s in %s\n", lbl,o_dll->name);*/
1186 __attribute((unused))
1188 lookupLocalSymbol( ObjectCode* oc, char *lbl )
1192 val = lookupStrHashTable(oc->lochash, lbl);
1202 /* -----------------------------------------------------------------------------
1203 * Debugging aid: look in GHCi's object symbol tables for symbols
1204 * within DELTA bytes of the specified address, and show their names.
1207 void ghci_enquire ( char* addr );
1209 void ghci_enquire ( char* addr )
1214 const int DELTA = 64;
1219 for (oc = objects; oc; oc = oc->next) {
1220 for (i = 0; i < oc->n_symbols; i++) {
1221 sym = oc->symbols[i];
1222 if (sym == NULL) continue;
1223 // debugBelch("enquire %p %p\n", sym, oc->lochash);
1225 if (oc->lochash != NULL) {
1226 a = lookupStrHashTable(oc->lochash, sym);
1229 a = lookupStrHashTable(symhash, sym);
1232 // debugBelch("ghci_enquire: can't find %s\n", sym);
1234 else if (addr-DELTA <= a && a <= addr+DELTA) {
1235 debugBelch("%p + %3d == `%s'\n", addr, (int)(a - addr), sym);
1242 #ifdef ia64_HOST_ARCH
1243 static unsigned int PLTSize(void);
1246 /* -----------------------------------------------------------------------------
1247 * Load an obj (populate the global symbol table, but don't resolve yet)
1249 * Returns: 1 if ok, 0 on error.
1252 loadObj( char *path )
1259 void *map_addr = NULL;
1266 /* debugBelch("loadObj %s\n", path ); */
1268 /* Check that we haven't already loaded this object.
1269 Ignore requests to load multiple times */
1273 for (o = objects; o; o = o->next) {
1274 if (0 == strcmp(o->fileName, path)) {
1276 break; /* don't need to search further */
1280 IF_DEBUG(linker, debugBelch(
1281 "GHCi runtime linker: warning: looks like you're trying to load the\n"
1282 "same object file twice:\n"
1284 "GHCi will ignore this, but be warned.\n"
1286 return 1; /* success */
1290 oc = stgMallocBytes(sizeof(ObjectCode), "loadObj(oc)");
1292 # if defined(OBJFORMAT_ELF)
1293 oc->formatName = "ELF";
1294 # elif defined(OBJFORMAT_PEi386)
1295 oc->formatName = "PEi386";
1296 # elif defined(OBJFORMAT_MACHO)
1297 oc->formatName = "Mach-O";
1300 barf("loadObj: not implemented on this platform");
1303 r = stat(path, &st);
1304 if (r == -1) { return 0; }
1306 /* sigh, strdup() isn't a POSIX function, so do it the long way */
1307 oc->fileName = stgMallocBytes( strlen(path)+1, "loadObj" );
1308 strcpy(oc->fileName, path);
1310 oc->fileSize = st.st_size;
1312 oc->sections = NULL;
1313 oc->lochash = allocStrHashTable();
1314 oc->proddables = NULL;
1316 /* chain it onto the list of objects */
1321 #define ROUND_UP(x,size) ((x + size - 1) & ~(size - 1))
1323 /* On many architectures malloc'd memory isn't executable, so we need to use mmap. */
1325 #if defined(openbsd_HOST_OS)
1326 fd = open(path, O_RDONLY, S_IRUSR);
1328 fd = open(path, O_RDONLY);
1331 barf("loadObj: can't open `%s'", path);
1333 pagesize = getpagesize();
1335 #ifdef ia64_HOST_ARCH
1336 /* The PLT needs to be right before the object */
1337 n = ROUND_UP(PLTSize(), pagesize);
1338 oc->plt = mmap(NULL, n, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
1339 if (oc->plt == MAP_FAILED)
1340 barf("loadObj: can't allocate PLT");
1343 map_addr = oc->plt + n;
1346 n = ROUND_UP(oc->fileSize, pagesize);
1348 /* Link objects into the lower 2Gb on x86_64. GHC assumes the
1349 * small memory model on this architecture (see gcc docs,
1352 #ifdef x86_64_HOST_ARCH
1353 #define EXTRA_MAP_FLAGS MAP_32BIT
1355 #define EXTRA_MAP_FLAGS 0
1358 oc->image = mmap(map_addr, n, PROT_EXEC|PROT_READ|PROT_WRITE,
1359 MAP_PRIVATE|EXTRA_MAP_FLAGS, fd, 0);
1360 if (oc->image == MAP_FAILED)
1361 barf("loadObj: can't map `%s'", path);
1365 #else /* !USE_MMAP */
1367 /* load the image into memory */
1368 f = fopen(path, "rb");
1370 barf("loadObj: can't read `%s'", path);
1372 #ifdef darwin_HOST_OS
1373 // In a Mach-O .o file, all sections can and will be misaligned
1374 // if the total size of the headers is not a multiple of the
1375 // desired alignment. This is fine for .o files that only serve
1376 // as input for the static linker, but it's not fine for us,
1377 // as SSE (used by gcc for floating point) and Altivec require
1378 // 16-byte alignment.
1379 // We calculate the correct alignment from the header before
1380 // reading the file, and then we misalign oc->image on purpose so
1381 // that the actual sections end up aligned again.
1382 misalignment = machoGetMisalignment(f);
1383 oc->misalignment = misalignment;
1388 oc->image = stgMallocBytes(oc->fileSize + misalignment, "loadObj(image)");
1389 oc->image += misalignment;
1391 n = fread ( oc->image, 1, oc->fileSize, f );
1392 if (n != oc->fileSize)
1393 barf("loadObj: error whilst reading `%s'", path);
1397 #endif /* USE_MMAP */
1399 # if defined(OBJFORMAT_MACHO) && defined(powerpc_HOST_ARCH)
1400 r = ocAllocateJumpIslands_MachO ( oc );
1401 if (!r) { return r; }
1402 # elif defined(OBJFORMAT_ELF) && defined(powerpc_HOST_ARCH)
1403 r = ocAllocateJumpIslands_ELF ( oc );
1404 if (!r) { return r; }
1407 /* verify the in-memory image */
1408 # if defined(OBJFORMAT_ELF)
1409 r = ocVerifyImage_ELF ( oc );
1410 # elif defined(OBJFORMAT_PEi386)
1411 r = ocVerifyImage_PEi386 ( oc );
1412 # elif defined(OBJFORMAT_MACHO)
1413 r = ocVerifyImage_MachO ( oc );
1415 barf("loadObj: no verify method");
1417 if (!r) { return r; }
1419 /* build the symbol list for this image */
1420 # if defined(OBJFORMAT_ELF)
1421 r = ocGetNames_ELF ( oc );
1422 # elif defined(OBJFORMAT_PEi386)
1423 r = ocGetNames_PEi386 ( oc );
1424 # elif defined(OBJFORMAT_MACHO)
1425 r = ocGetNames_MachO ( oc );
1427 barf("loadObj: no getNames method");
1429 if (!r) { return r; }
1431 /* loaded, but not resolved yet */
1432 oc->status = OBJECT_LOADED;
1437 /* -----------------------------------------------------------------------------
1438 * resolve all the currently unlinked objects in memory
1440 * Returns: 1 if ok, 0 on error.
1450 for (oc = objects; oc; oc = oc->next) {
1451 if (oc->status != OBJECT_RESOLVED) {
1452 # if defined(OBJFORMAT_ELF)
1453 r = ocResolve_ELF ( oc );
1454 # elif defined(OBJFORMAT_PEi386)
1455 r = ocResolve_PEi386 ( oc );
1456 # elif defined(OBJFORMAT_MACHO)
1457 r = ocResolve_MachO ( oc );
1459 barf("resolveObjs: not implemented on this platform");
1461 if (!r) { return r; }
1462 oc->status = OBJECT_RESOLVED;
1468 /* -----------------------------------------------------------------------------
1469 * delete an object from the pool
1472 unloadObj( char *path )
1474 ObjectCode *oc, *prev;
1476 ASSERT(symhash != NULL);
1477 ASSERT(objects != NULL);
1482 for (oc = objects; oc; prev = oc, oc = oc->next) {
1483 if (!strcmp(oc->fileName,path)) {
1485 /* Remove all the mappings for the symbols within this
1490 for (i = 0; i < oc->n_symbols; i++) {
1491 if (oc->symbols[i] != NULL) {
1492 removeStrHashTable(symhash, oc->symbols[i], NULL);
1500 prev->next = oc->next;
1503 /* We're going to leave this in place, in case there are
1504 any pointers from the heap into it: */
1505 /* stgFree(oc->image); */
1506 stgFree(oc->fileName);
1507 stgFree(oc->symbols);
1508 stgFree(oc->sections);
1509 /* The local hash table should have been freed at the end
1510 of the ocResolve_ call on it. */
1511 ASSERT(oc->lochash == NULL);
1517 errorBelch("unloadObj: can't find `%s' to unload", path);
1521 /* -----------------------------------------------------------------------------
1522 * Sanity checking. For each ObjectCode, maintain a list of address ranges
1523 * which may be prodded during relocation, and abort if we try and write
1524 * outside any of these.
1526 static void addProddableBlock ( ObjectCode* oc, void* start, int size )
1529 = stgMallocBytes(sizeof(ProddableBlock), "addProddableBlock");
1530 /* debugBelch("aPB %p %p %d\n", oc, start, size); */
1534 pb->next = oc->proddables;
1535 oc->proddables = pb;
1538 static void checkProddableBlock ( ObjectCode* oc, void* addr )
1541 for (pb = oc->proddables; pb != NULL; pb = pb->next) {
1542 char* s = (char*)(pb->start);
1543 char* e = s + pb->size - 1;
1544 char* a = (char*)addr;
1545 /* Assumes that the biggest fixup involves a 4-byte write. This
1546 probably needs to be changed to 8 (ie, +7) on 64-bit
1548 if (a >= s && (a+3) <= e) return;
1550 barf("checkProddableBlock: invalid fixup in runtime linker");
1553 /* -----------------------------------------------------------------------------
1554 * Section management.
1556 static void addSection ( ObjectCode* oc, SectionKind kind,
1557 void* start, void* end )
1559 Section* s = stgMallocBytes(sizeof(Section), "addSection");
1563 s->next = oc->sections;
1566 debugBelch("addSection: %p-%p (size %d), kind %d\n",
1567 start, ((char*)end)-1, end - start + 1, kind );
1572 /* --------------------------------------------------------------------------
1573 * PowerPC specifics (jump islands)
1574 * ------------------------------------------------------------------------*/
1576 #if defined(powerpc_HOST_ARCH)
1579 ocAllocateJumpIslands
1581 Allocate additional space at the end of the object file image to make room
1584 PowerPC relative branch instructions have a 24 bit displacement field.
1585 As PPC code is always 4-byte-aligned, this yields a +-32MB range.
1586 If a particular imported symbol is outside this range, we have to redirect
1587 the jump to a short piece of new code that just loads the 32bit absolute
1588 address and jumps there.
1589 This function just allocates space for one 16 byte ppcJumpIsland for every
1590 undefined symbol in the object file. The code for the islands is filled in by
1591 makeJumpIsland below.
1594 static int ocAllocateJumpIslands( ObjectCode* oc, int count, int first )
1600 int misalignment = 0;
1602 misalignment = oc->misalignment;
1607 // round up to the nearest 4
1608 aligned = (oc->fileSize + 3) & ~3;
1611 #ifndef linux_HOST_OS /* mremap is a linux extension */
1612 #error ocAllocateJumpIslands doesnt want USE_MMAP to be defined
1615 pagesize = getpagesize();
1616 n = ROUND_UP( oc->fileSize, pagesize );
1617 m = ROUND_UP( aligned + sizeof (ppcJumpIsland) * count, pagesize );
1619 /* If we have a half-page-size file and map one page of it then
1620 * the part of the page after the size of the file remains accessible.
1621 * If, however, we map in 2 pages, the 2nd page is not accessible
1622 * and will give a "Bus Error" on access. To get around this, we check
1623 * if we need any extra pages for the jump islands and map them in
1624 * anonymously. We must check that we actually require extra pages
1625 * otherwise the attempt to mmap 0 pages of anonymous memory will
1631 /* The effect of this mremap() call is only the ensure that we have
1632 * a sufficient number of virtually contiguous pages. As returned from
1633 * mremap, the pages past the end of the file are not backed. We give
1634 * them a backing by using MAP_FIXED to map in anonymous pages.
1636 oc->image = mremap( oc->image, n, m, MREMAP_MAYMOVE );
1638 if( oc->image == MAP_FAILED )
1640 errorBelch( "Unable to mremap for Jump Islands\n" );
1644 if( mmap( oc->image + n, m - n, PROT_READ | PROT_WRITE | PROT_EXEC,
1645 MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED, 0, 0 ) == MAP_FAILED )
1647 errorBelch( "Unable to mmap( MAP_FIXED ) for Jump Islands\n" );
1653 oc->image -= misalignment;
1654 oc->image = stgReallocBytes( oc->image,
1656 aligned + sizeof (ppcJumpIsland) * count,
1657 "ocAllocateJumpIslands" );
1658 oc->image += misalignment;
1659 #endif /* USE_MMAP */
1661 oc->jump_islands = (ppcJumpIsland *) (oc->image + aligned);
1662 memset( oc->jump_islands, 0, sizeof (ppcJumpIsland) * count );
1665 oc->jump_islands = NULL;
1667 oc->island_start_symbol = first;
1668 oc->n_islands = count;
1673 static unsigned long makeJumpIsland( ObjectCode* oc,
1674 unsigned long symbolNumber,
1675 unsigned long target )
1677 ppcJumpIsland *island;
1679 if( symbolNumber < oc->island_start_symbol ||
1680 symbolNumber - oc->island_start_symbol > oc->n_islands)
1683 island = &oc->jump_islands[symbolNumber - oc->island_start_symbol];
1685 // lis r12, hi16(target)
1686 island->lis_r12 = 0x3d80;
1687 island->hi_addr = target >> 16;
1689 // ori r12, r12, lo16(target)
1690 island->ori_r12_r12 = 0x618c;
1691 island->lo_addr = target & 0xffff;
1694 island->mtctr_r12 = 0x7d8903a6;
1697 island->bctr = 0x4e800420;
1699 return (unsigned long) island;
1703 ocFlushInstructionCache
1705 Flush the data & instruction caches.
1706 Because the PPC has split data/instruction caches, we have to
1707 do that whenever we modify code at runtime.
1710 static void ocFlushInstructionCache( ObjectCode *oc )
1712 int n = (oc->fileSize + sizeof( ppcJumpIsland ) * oc->n_islands + 3) / 4;
1713 unsigned long *p = (unsigned long *) oc->image;
1717 __asm__ volatile ( "dcbf 0,%0\n\t"
1725 __asm__ volatile ( "sync\n\t"
1731 /* --------------------------------------------------------------------------
1732 * PEi386 specifics (Win32 targets)
1733 * ------------------------------------------------------------------------*/
1735 /* The information for this linker comes from
1736 Microsoft Portable Executable
1737 and Common Object File Format Specification
1738 revision 5.1 January 1998
1739 which SimonM says comes from the MS Developer Network CDs.
1741 It can be found there (on older CDs), but can also be found
1744 http://www.microsoft.com/hwdev/hardware/PECOFF.asp
1746 (this is Rev 6.0 from February 1999).
1748 Things move, so if that fails, try searching for it via
1750 http://www.google.com/search?q=PE+COFF+specification
1752 The ultimate reference for the PE format is the Winnt.h
1753 header file that comes with the Platform SDKs; as always,
1754 implementations will drift wrt their documentation.
1756 A good background article on the PE format is Matt Pietrek's
1757 March 1994 article in Microsoft System Journal (MSJ)
1758 (Vol.9, No. 3): "Peering Inside the PE: A Tour of the
1759 Win32 Portable Executable File Format." The info in there
1760 has recently been updated in a two part article in
1761 MSDN magazine, issues Feb and March 2002,
1762 "Inside Windows: An In-Depth Look into the Win32 Portable
1763 Executable File Format"
1765 John Levine's book "Linkers and Loaders" contains useful
1770 #if defined(OBJFORMAT_PEi386)
1774 typedef unsigned char UChar;
1775 typedef unsigned short UInt16;
1776 typedef unsigned int UInt32;
1783 UInt16 NumberOfSections;
1784 UInt32 TimeDateStamp;
1785 UInt32 PointerToSymbolTable;
1786 UInt32 NumberOfSymbols;
1787 UInt16 SizeOfOptionalHeader;
1788 UInt16 Characteristics;
1792 #define sizeof_COFF_header 20
1799 UInt32 VirtualAddress;
1800 UInt32 SizeOfRawData;
1801 UInt32 PointerToRawData;
1802 UInt32 PointerToRelocations;
1803 UInt32 PointerToLinenumbers;
1804 UInt16 NumberOfRelocations;
1805 UInt16 NumberOfLineNumbers;
1806 UInt32 Characteristics;
1810 #define sizeof_COFF_section 40
1817 UInt16 SectionNumber;
1820 UChar NumberOfAuxSymbols;
1824 #define sizeof_COFF_symbol 18
1829 UInt32 VirtualAddress;
1830 UInt32 SymbolTableIndex;
1835 #define sizeof_COFF_reloc 10
1838 /* From PE spec doc, section 3.3.2 */
1839 /* Note use of MYIMAGE_* since IMAGE_* are already defined in
1840 windows.h -- for the same purpose, but I want to know what I'm
1842 #define MYIMAGE_FILE_RELOCS_STRIPPED 0x0001
1843 #define MYIMAGE_FILE_EXECUTABLE_IMAGE 0x0002
1844 #define MYIMAGE_FILE_DLL 0x2000
1845 #define MYIMAGE_FILE_SYSTEM 0x1000
1846 #define MYIMAGE_FILE_BYTES_REVERSED_HI 0x8000
1847 #define MYIMAGE_FILE_BYTES_REVERSED_LO 0x0080
1848 #define MYIMAGE_FILE_32BIT_MACHINE 0x0100
1850 /* From PE spec doc, section 5.4.2 and 5.4.4 */
1851 #define MYIMAGE_SYM_CLASS_EXTERNAL 2
1852 #define MYIMAGE_SYM_CLASS_STATIC 3
1853 #define MYIMAGE_SYM_UNDEFINED 0
1855 /* From PE spec doc, section 4.1 */
1856 #define MYIMAGE_SCN_CNT_CODE 0x00000020
1857 #define MYIMAGE_SCN_CNT_INITIALIZED_DATA 0x00000040
1858 #define MYIMAGE_SCN_LNK_NRELOC_OVFL 0x01000000
1860 /* From PE spec doc, section 5.2.1 */
1861 #define MYIMAGE_REL_I386_DIR32 0x0006
1862 #define MYIMAGE_REL_I386_REL32 0x0014
1865 /* We use myindex to calculate array addresses, rather than
1866 simply doing the normal subscript thing. That's because
1867 some of the above structs have sizes which are not
1868 a whole number of words. GCC rounds their sizes up to a
1869 whole number of words, which means that the address calcs
1870 arising from using normal C indexing or pointer arithmetic
1871 are just plain wrong. Sigh.
1874 myindex ( int scale, void* base, int index )
1877 ((UChar*)base) + scale * index;
1882 printName ( UChar* name, UChar* strtab )
1884 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
1885 UInt32 strtab_offset = * (UInt32*)(name+4);
1886 debugBelch("%s", strtab + strtab_offset );
1889 for (i = 0; i < 8; i++) {
1890 if (name[i] == 0) break;
1891 debugBelch("%c", name[i] );
1898 copyName ( UChar* name, UChar* strtab, UChar* dst, int dstSize )
1900 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
1901 UInt32 strtab_offset = * (UInt32*)(name+4);
1902 strncpy ( dst, strtab+strtab_offset, dstSize );
1908 if (name[i] == 0) break;
1918 cstring_from_COFF_symbol_name ( UChar* name, UChar* strtab )
1921 /* If the string is longer than 8 bytes, look in the
1922 string table for it -- this will be correctly zero terminated.
1924 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
1925 UInt32 strtab_offset = * (UInt32*)(name+4);
1926 return ((UChar*)strtab) + strtab_offset;
1928 /* Otherwise, if shorter than 8 bytes, return the original,
1929 which by defn is correctly terminated.
1931 if (name[7]==0) return name;
1932 /* The annoying case: 8 bytes. Copy into a temporary
1933 (which is never freed ...)
1935 newstr = stgMallocBytes(9, "cstring_from_COFF_symbol_name");
1937 strncpy(newstr,name,8);
1943 /* Just compares the short names (first 8 chars) */
1944 static COFF_section *
1945 findPEi386SectionCalled ( ObjectCode* oc, char* name )
1949 = (COFF_header*)(oc->image);
1950 COFF_section* sectab
1952 ((UChar*)(oc->image))
1953 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
1955 for (i = 0; i < hdr->NumberOfSections; i++) {
1958 COFF_section* section_i
1960 myindex ( sizeof_COFF_section, sectab, i );
1961 n1 = (UChar*) &(section_i->Name);
1963 if (n1[0]==n2[0] && n1[1]==n2[1] && n1[2]==n2[2] &&
1964 n1[3]==n2[3] && n1[4]==n2[4] && n1[5]==n2[5] &&
1965 n1[6]==n2[6] && n1[7]==n2[7])
1974 zapTrailingAtSign ( UChar* sym )
1976 # define my_isdigit(c) ((c) >= '0' && (c) <= '9')
1978 if (sym[0] == 0) return;
1980 while (sym[i] != 0) i++;
1983 while (j > 0 && my_isdigit(sym[j])) j--;
1984 if (j > 0 && sym[j] == '@' && j != i) sym[j] = 0;
1990 ocVerifyImage_PEi386 ( ObjectCode* oc )
1995 COFF_section* sectab;
1996 COFF_symbol* symtab;
1998 /* debugBelch("\nLOADING %s\n", oc->fileName); */
1999 hdr = (COFF_header*)(oc->image);
2000 sectab = (COFF_section*) (
2001 ((UChar*)(oc->image))
2002 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2004 symtab = (COFF_symbol*) (
2005 ((UChar*)(oc->image))
2006 + hdr->PointerToSymbolTable
2008 strtab = ((UChar*)symtab)
2009 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
2011 if (hdr->Machine != 0x14c) {
2012 errorBelch("%s: Not x86 PEi386", oc->fileName);
2015 if (hdr->SizeOfOptionalHeader != 0) {
2016 errorBelch("%s: PEi386 with nonempty optional header", oc->fileName);
2019 if ( /* (hdr->Characteristics & MYIMAGE_FILE_RELOCS_STRIPPED) || */
2020 (hdr->Characteristics & MYIMAGE_FILE_EXECUTABLE_IMAGE) ||
2021 (hdr->Characteristics & MYIMAGE_FILE_DLL) ||
2022 (hdr->Characteristics & MYIMAGE_FILE_SYSTEM) ) {
2023 errorBelch("%s: Not a PEi386 object file", oc->fileName);
2026 if ( (hdr->Characteristics & MYIMAGE_FILE_BYTES_REVERSED_HI)
2027 /* || !(hdr->Characteristics & MYIMAGE_FILE_32BIT_MACHINE) */ ) {
2028 errorBelch("%s: Invalid PEi386 word size or endiannness: %d",
2030 (int)(hdr->Characteristics));
2033 /* If the string table size is way crazy, this might indicate that
2034 there are more than 64k relocations, despite claims to the
2035 contrary. Hence this test. */
2036 /* debugBelch("strtab size %d\n", * (UInt32*)strtab); */
2038 if ( (*(UInt32*)strtab) > 600000 ) {
2039 /* Note that 600k has no special significance other than being
2040 big enough to handle the almost-2MB-sized lumps that
2041 constitute HSwin32*.o. */
2042 debugBelch("PEi386 object has suspiciously large string table; > 64k relocs?");
2047 /* No further verification after this point; only debug printing. */
2049 IF_DEBUG(linker, i=1);
2050 if (i == 0) return 1;
2052 debugBelch( "sectab offset = %d\n", ((UChar*)sectab) - ((UChar*)hdr) );
2053 debugBelch( "symtab offset = %d\n", ((UChar*)symtab) - ((UChar*)hdr) );
2054 debugBelch( "strtab offset = %d\n", ((UChar*)strtab) - ((UChar*)hdr) );
2057 debugBelch( "Machine: 0x%x\n", (UInt32)(hdr->Machine) );
2058 debugBelch( "# sections: %d\n", (UInt32)(hdr->NumberOfSections) );
2059 debugBelch( "time/date: 0x%x\n", (UInt32)(hdr->TimeDateStamp) );
2060 debugBelch( "symtab offset: %d\n", (UInt32)(hdr->PointerToSymbolTable) );
2061 debugBelch( "# symbols: %d\n", (UInt32)(hdr->NumberOfSymbols) );
2062 debugBelch( "sz of opt hdr: %d\n", (UInt32)(hdr->SizeOfOptionalHeader) );
2063 debugBelch( "characteristics: 0x%x\n", (UInt32)(hdr->Characteristics) );
2065 /* Print the section table. */
2067 for (i = 0; i < hdr->NumberOfSections; i++) {
2069 COFF_section* sectab_i
2071 myindex ( sizeof_COFF_section, sectab, i );
2078 printName ( sectab_i->Name, strtab );
2088 sectab_i->VirtualSize,
2089 sectab_i->VirtualAddress,
2090 sectab_i->SizeOfRawData,
2091 sectab_i->PointerToRawData,
2092 sectab_i->NumberOfRelocations,
2093 sectab_i->PointerToRelocations,
2094 sectab_i->PointerToRawData
2096 reltab = (COFF_reloc*) (
2097 ((UChar*)(oc->image)) + sectab_i->PointerToRelocations
2100 if ( sectab_i->Characteristics & MYIMAGE_SCN_LNK_NRELOC_OVFL ) {
2101 /* If the relocation field (a short) has overflowed, the
2102 * real count can be found in the first reloc entry.
2104 * See Section 4.1 (last para) of the PE spec (rev6.0).
2106 COFF_reloc* rel = (COFF_reloc*)
2107 myindex ( sizeof_COFF_reloc, reltab, 0 );
2108 noRelocs = rel->VirtualAddress;
2111 noRelocs = sectab_i->NumberOfRelocations;
2115 for (; j < noRelocs; j++) {
2117 COFF_reloc* rel = (COFF_reloc*)
2118 myindex ( sizeof_COFF_reloc, reltab, j );
2120 " type 0x%-4x vaddr 0x%-8x name `",
2122 rel->VirtualAddress );
2123 sym = (COFF_symbol*)
2124 myindex ( sizeof_COFF_symbol, symtab, rel->SymbolTableIndex );
2125 /* Hmm..mysterious looking offset - what's it for? SOF */
2126 printName ( sym->Name, strtab -10 );
2133 debugBelch("string table has size 0x%x\n", * (UInt32*)strtab );
2134 debugBelch("---START of string table---\n");
2135 for (i = 4; i < *(Int32*)strtab; i++) {
2137 debugBelch("\n"); else
2138 debugBelch("%c", strtab[i] );
2140 debugBelch("--- END of string table---\n");
2145 COFF_symbol* symtab_i;
2146 if (i >= (Int32)(hdr->NumberOfSymbols)) break;
2147 symtab_i = (COFF_symbol*)
2148 myindex ( sizeof_COFF_symbol, symtab, i );
2154 printName ( symtab_i->Name, strtab );
2163 (Int32)(symtab_i->SectionNumber),
2164 (UInt32)symtab_i->Type,
2165 (UInt32)symtab_i->StorageClass,
2166 (UInt32)symtab_i->NumberOfAuxSymbols
2168 i += symtab_i->NumberOfAuxSymbols;
2178 ocGetNames_PEi386 ( ObjectCode* oc )
2181 COFF_section* sectab;
2182 COFF_symbol* symtab;
2189 hdr = (COFF_header*)(oc->image);
2190 sectab = (COFF_section*) (
2191 ((UChar*)(oc->image))
2192 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2194 symtab = (COFF_symbol*) (
2195 ((UChar*)(oc->image))
2196 + hdr->PointerToSymbolTable
2198 strtab = ((UChar*)(oc->image))
2199 + hdr->PointerToSymbolTable
2200 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
2202 /* Allocate space for any (local, anonymous) .bss sections. */
2204 for (i = 0; i < hdr->NumberOfSections; i++) {
2207 COFF_section* sectab_i
2209 myindex ( sizeof_COFF_section, sectab, i );
2210 if (0 != strcmp(sectab_i->Name, ".bss")) continue;
2211 /* sof 10/05: the PE spec text isn't too clear regarding what
2212 * the SizeOfRawData field is supposed to hold for object
2213 * file sections containing just uninitialized data -- for executables,
2214 * it is supposed to be zero; unclear what it's supposed to be
2215 * for object files. However, VirtualSize is guaranteed to be
2216 * zero for object files, which definitely suggests that SizeOfRawData
2217 * will be non-zero (where else would the size of this .bss section be
2218 * stored?) Looking at the COFF_section info for incoming object files,
2219 * this certainly appears to be the case.
2221 * => I suspect we've been incorrectly handling .bss sections in (relocatable)
2222 * object files up until now. This turned out to bite us with ghc-6.4.1's use
2223 * of gcc-3.4.x, which has started to emit initially-zeroed-out local 'static'
2224 * variable decls into to the .bss section. (The specific function in Q which
2225 * triggered this is libraries/base/cbits/dirUtils.c:__hscore_getFolderPath())
2227 if (sectab_i->VirtualSize == 0 && sectab_i->SizeOfRawData == 0) continue;
2228 /* This is a non-empty .bss section. Allocate zeroed space for
2229 it, and set its PointerToRawData field such that oc->image +
2230 PointerToRawData == addr_of_zeroed_space. */
2231 bss_sz = sectab_i->VirtualSize;
2232 if ( bss_sz < sectab_i->SizeOfRawData) { bss_sz = sectab_i->SizeOfRawData; }
2233 zspace = stgCallocBytes(1, bss_sz, "ocGetNames_PEi386(anonymous bss)");
2234 sectab_i->PointerToRawData = ((UChar*)zspace) - ((UChar*)(oc->image));
2235 addProddableBlock(oc, zspace, bss_sz);
2236 /* debugBelch("BSS anon section at 0x%x\n", zspace); */
2239 /* Copy section information into the ObjectCode. */
2241 for (i = 0; i < hdr->NumberOfSections; i++) {
2247 = SECTIONKIND_OTHER;
2248 COFF_section* sectab_i
2250 myindex ( sizeof_COFF_section, sectab, i );
2251 IF_DEBUG(linker, debugBelch("section name = %s\n", sectab_i->Name ));
2254 /* I'm sure this is the Right Way to do it. However, the
2255 alternative of testing the sectab_i->Name field seems to
2256 work ok with Cygwin.
2258 if (sectab_i->Characteristics & MYIMAGE_SCN_CNT_CODE ||
2259 sectab_i->Characteristics & MYIMAGE_SCN_CNT_INITIALIZED_DATA)
2260 kind = SECTIONKIND_CODE_OR_RODATA;
2263 if (0==strcmp(".text",sectab_i->Name) ||
2264 0==strcmp(".rdata",sectab_i->Name)||
2265 0==strcmp(".rodata",sectab_i->Name))
2266 kind = SECTIONKIND_CODE_OR_RODATA;
2267 if (0==strcmp(".data",sectab_i->Name) ||
2268 0==strcmp(".bss",sectab_i->Name))
2269 kind = SECTIONKIND_RWDATA;
2271 ASSERT(sectab_i->SizeOfRawData == 0 || sectab_i->VirtualSize == 0);
2272 sz = sectab_i->SizeOfRawData;
2273 if (sz < sectab_i->VirtualSize) sz = sectab_i->VirtualSize;
2275 start = ((UChar*)(oc->image)) + sectab_i->PointerToRawData;
2276 end = start + sz - 1;
2278 if (kind == SECTIONKIND_OTHER
2279 /* Ignore sections called which contain stabs debugging
2281 && 0 != strcmp(".stab", sectab_i->Name)
2282 && 0 != strcmp(".stabstr", sectab_i->Name)
2283 /* ignore constructor section for now */
2284 && 0 != strcmp(".ctors", sectab_i->Name)
2285 /* ignore section generated from .ident */
2286 && 0!= strcmp("/4", sectab_i->Name)
2288 errorBelch("Unknown PEi386 section name `%s' (while processing: %s)", sectab_i->Name, oc->fileName);
2292 if (kind != SECTIONKIND_OTHER && end >= start) {
2293 addSection(oc, kind, start, end);
2294 addProddableBlock(oc, start, end - start + 1);
2298 /* Copy exported symbols into the ObjectCode. */
2300 oc->n_symbols = hdr->NumberOfSymbols;
2301 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
2302 "ocGetNames_PEi386(oc->symbols)");
2303 /* Call me paranoid; I don't care. */
2304 for (i = 0; i < oc->n_symbols; i++)
2305 oc->symbols[i] = NULL;
2309 COFF_symbol* symtab_i;
2310 if (i >= (Int32)(hdr->NumberOfSymbols)) break;
2311 symtab_i = (COFF_symbol*)
2312 myindex ( sizeof_COFF_symbol, symtab, i );
2316 if (symtab_i->StorageClass == MYIMAGE_SYM_CLASS_EXTERNAL
2317 && symtab_i->SectionNumber != MYIMAGE_SYM_UNDEFINED) {
2318 /* This symbol is global and defined, viz, exported */
2319 /* for MYIMAGE_SYMCLASS_EXTERNAL
2320 && !MYIMAGE_SYM_UNDEFINED,
2321 the address of the symbol is:
2322 address of relevant section + offset in section
2324 COFF_section* sectabent
2325 = (COFF_section*) myindex ( sizeof_COFF_section,
2327 symtab_i->SectionNumber-1 );
2328 addr = ((UChar*)(oc->image))
2329 + (sectabent->PointerToRawData
2333 if (symtab_i->SectionNumber == MYIMAGE_SYM_UNDEFINED
2334 && symtab_i->Value > 0) {
2335 /* This symbol isn't in any section at all, ie, global bss.
2336 Allocate zeroed space for it. */
2337 addr = stgCallocBytes(1, symtab_i->Value,
2338 "ocGetNames_PEi386(non-anonymous bss)");
2339 addSection(oc, SECTIONKIND_RWDATA, addr,
2340 ((UChar*)addr) + symtab_i->Value - 1);
2341 addProddableBlock(oc, addr, symtab_i->Value);
2342 /* debugBelch("BSS section at 0x%x\n", addr); */
2345 if (addr != NULL ) {
2346 sname = cstring_from_COFF_symbol_name ( symtab_i->Name, strtab );
2347 /* debugBelch("addSymbol %p `%s \n", addr,sname); */
2348 IF_DEBUG(linker, debugBelch("addSymbol %p `%s'\n", addr,sname);)
2349 ASSERT(i >= 0 && i < oc->n_symbols);
2350 /* cstring_from_COFF_symbol_name always succeeds. */
2351 oc->symbols[i] = sname;
2352 ghciInsertStrHashTable(oc->fileName, symhash, sname, addr);
2356 "IGNORING symbol %d\n"
2360 printName ( symtab_i->Name, strtab );
2369 (Int32)(symtab_i->SectionNumber),
2370 (UInt32)symtab_i->Type,
2371 (UInt32)symtab_i->StorageClass,
2372 (UInt32)symtab_i->NumberOfAuxSymbols
2377 i += symtab_i->NumberOfAuxSymbols;
2386 ocResolve_PEi386 ( ObjectCode* oc )
2389 COFF_section* sectab;
2390 COFF_symbol* symtab;
2400 /* ToDo: should be variable-sized? But is at least safe in the
2401 sense of buffer-overrun-proof. */
2403 /* debugBelch("resolving for %s\n", oc->fileName); */
2405 hdr = (COFF_header*)(oc->image);
2406 sectab = (COFF_section*) (
2407 ((UChar*)(oc->image))
2408 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2410 symtab = (COFF_symbol*) (
2411 ((UChar*)(oc->image))
2412 + hdr->PointerToSymbolTable
2414 strtab = ((UChar*)(oc->image))
2415 + hdr->PointerToSymbolTable
2416 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
2418 for (i = 0; i < hdr->NumberOfSections; i++) {
2419 COFF_section* sectab_i
2421 myindex ( sizeof_COFF_section, sectab, i );
2424 ((UChar*)(oc->image)) + sectab_i->PointerToRelocations
2427 /* Ignore sections called which contain stabs debugging
2429 if (0 == strcmp(".stab", sectab_i->Name)
2430 || 0 == strcmp(".stabstr", sectab_i->Name)
2431 || 0 == strcmp(".ctors", sectab_i->Name))
2434 if ( sectab_i->Characteristics & MYIMAGE_SCN_LNK_NRELOC_OVFL ) {
2435 /* If the relocation field (a short) has overflowed, the
2436 * real count can be found in the first reloc entry.
2438 * See Section 4.1 (last para) of the PE spec (rev6.0).
2440 * Nov2003 update: the GNU linker still doesn't correctly
2441 * handle the generation of relocatable object files with
2442 * overflown relocations. Hence the output to warn of potential
2445 COFF_reloc* rel = (COFF_reloc*)
2446 myindex ( sizeof_COFF_reloc, reltab, 0 );
2447 noRelocs = rel->VirtualAddress;
2449 /* 10/05: we now assume (and check for) a GNU ld that is capable
2450 * of handling object files with (>2^16) of relocs.
2453 debugBelch("WARNING: Overflown relocation field (# relocs found: %u)\n",
2458 noRelocs = sectab_i->NumberOfRelocations;
2463 for (; j < noRelocs; j++) {
2465 COFF_reloc* reltab_j
2467 myindex ( sizeof_COFF_reloc, reltab, j );
2469 /* the location to patch */
2471 ((UChar*)(oc->image))
2472 + (sectab_i->PointerToRawData
2473 + reltab_j->VirtualAddress
2474 - sectab_i->VirtualAddress )
2476 /* the existing contents of pP */
2478 /* the symbol to connect to */
2479 sym = (COFF_symbol*)
2480 myindex ( sizeof_COFF_symbol,
2481 symtab, reltab_j->SymbolTableIndex );
2484 "reloc sec %2d num %3d: type 0x%-4x "
2485 "vaddr 0x%-8x name `",
2487 (UInt32)reltab_j->Type,
2488 reltab_j->VirtualAddress );
2489 printName ( sym->Name, strtab );
2490 debugBelch("'\n" ));
2492 if (sym->StorageClass == MYIMAGE_SYM_CLASS_STATIC) {
2493 COFF_section* section_sym
2494 = findPEi386SectionCalled ( oc, sym->Name );
2496 errorBelch("%s: can't find section `%s'", oc->fileName, sym->Name);
2499 S = ((UInt32)(oc->image))
2500 + (section_sym->PointerToRawData
2503 copyName ( sym->Name, strtab, symbol, 1000-1 );
2504 (void*)S = lookupLocalSymbol( oc, symbol );
2505 if ((void*)S != NULL) goto foundit;
2506 (void*)S = lookupSymbol( symbol );
2507 if ((void*)S != NULL) goto foundit;
2508 zapTrailingAtSign ( symbol );
2509 (void*)S = lookupLocalSymbol( oc, symbol );
2510 if ((void*)S != NULL) goto foundit;
2511 (void*)S = lookupSymbol( symbol );
2512 if ((void*)S != NULL) goto foundit;
2513 /* Newline first because the interactive linker has printed "linking..." */
2514 errorBelch("\n%s: unknown symbol `%s'", oc->fileName, symbol);
2518 checkProddableBlock(oc, pP);
2519 switch (reltab_j->Type) {
2520 case MYIMAGE_REL_I386_DIR32:
2523 case MYIMAGE_REL_I386_REL32:
2524 /* Tricky. We have to insert a displacement at
2525 pP which, when added to the PC for the _next_
2526 insn, gives the address of the target (S).
2527 Problem is to know the address of the next insn
2528 when we only know pP. We assume that this
2529 literal field is always the last in the insn,
2530 so that the address of the next insn is pP+4
2531 -- hence the constant 4.
2532 Also I don't know if A should be added, but so
2533 far it has always been zero.
2535 SOF 05/2005: 'A' (old contents of *pP) have been observed
2536 to contain values other than zero (the 'wx' object file
2537 that came with wxhaskell-0.9.4; dunno how it was compiled..).
2538 So, add displacement to old value instead of asserting
2539 A to be zero. Fixes wxhaskell-related crashes, and no other
2540 ill effects have been observed.
2542 Update: the reason why we're seeing these more elaborate
2543 relocations is due to a switch in how the NCG compiles SRTs
2544 and offsets to them from info tables. SRTs live in .(ro)data,
2545 while info tables live in .text, causing GAS to emit REL32/DISP32
2546 relocations with non-zero values. Adding the displacement is
2547 the right thing to do.
2549 *pP = S - ((UInt32)pP) - 4 + A;
2552 debugBelch("%s: unhandled PEi386 relocation type %d",
2553 oc->fileName, reltab_j->Type);
2560 IF_DEBUG(linker, debugBelch("completed %s", oc->fileName));
2564 #endif /* defined(OBJFORMAT_PEi386) */
2567 /* --------------------------------------------------------------------------
2569 * ------------------------------------------------------------------------*/
2571 #if defined(OBJFORMAT_ELF)
2576 #if defined(sparc_HOST_ARCH)
2577 # define ELF_TARGET_SPARC /* Used inside <elf.h> */
2578 #elif defined(i386_HOST_ARCH)
2579 # define ELF_TARGET_386 /* Used inside <elf.h> */
2580 #elif defined(x86_64_HOST_ARCH)
2581 # define ELF_TARGET_X64_64
2583 #elif defined (ia64_HOST_ARCH)
2584 # define ELF_TARGET_IA64 /* Used inside <elf.h> */
2586 # define ELF_FUNCTION_DESC /* calling convention uses function descriptors */
2587 # define ELF_NEED_GOT /* needs Global Offset Table */
2588 # define ELF_NEED_PLT /* needs Procedure Linkage Tables */
2591 #if !defined(openbsd_HOST_OS)
2594 /* openbsd elf has things in different places, with diff names */
2595 #include <elf_abi.h>
2596 #include <machine/reloc.h>
2597 #define R_386_32 RELOC_32
2598 #define R_386_PC32 RELOC_PC32
2602 * Define a set of types which can be used for both ELF32 and ELF64
2606 #define ELFCLASS ELFCLASS64
2607 #define Elf_Addr Elf64_Addr
2608 #define Elf_Word Elf64_Word
2609 #define Elf_Sword Elf64_Sword
2610 #define Elf_Ehdr Elf64_Ehdr
2611 #define Elf_Phdr Elf64_Phdr
2612 #define Elf_Shdr Elf64_Shdr
2613 #define Elf_Sym Elf64_Sym
2614 #define Elf_Rel Elf64_Rel
2615 #define Elf_Rela Elf64_Rela
2616 #define ELF_ST_TYPE ELF64_ST_TYPE
2617 #define ELF_ST_BIND ELF64_ST_BIND
2618 #define ELF_R_TYPE ELF64_R_TYPE
2619 #define ELF_R_SYM ELF64_R_SYM
2621 #define ELFCLASS ELFCLASS32
2622 #define Elf_Addr Elf32_Addr
2623 #define Elf_Word Elf32_Word
2624 #define Elf_Sword Elf32_Sword
2625 #define Elf_Ehdr Elf32_Ehdr
2626 #define Elf_Phdr Elf32_Phdr
2627 #define Elf_Shdr Elf32_Shdr
2628 #define Elf_Sym Elf32_Sym
2629 #define Elf_Rel Elf32_Rel
2630 #define Elf_Rela Elf32_Rela
2632 #define ELF_ST_TYPE ELF32_ST_TYPE
2635 #define ELF_ST_BIND ELF32_ST_BIND
2638 #define ELF_R_TYPE ELF32_R_TYPE
2641 #define ELF_R_SYM ELF32_R_SYM
2647 * Functions to allocate entries in dynamic sections. Currently we simply
2648 * preallocate a large number, and we don't check if a entry for the given
2649 * target already exists (a linear search is too slow). Ideally these
2650 * entries would be associated with symbols.
2653 /* These sizes sufficient to load HSbase + HShaskell98 + a few modules */
2654 #define GOT_SIZE 0x20000
2655 #define FUNCTION_TABLE_SIZE 0x10000
2656 #define PLT_SIZE 0x08000
2659 static Elf_Addr got[GOT_SIZE];
2660 static unsigned int gotIndex;
2661 static Elf_Addr gp_val = (Elf_Addr)got;
2664 allocateGOTEntry(Elf_Addr target)
2668 if (gotIndex >= GOT_SIZE)
2669 barf("Global offset table overflow");
2671 entry = &got[gotIndex++];
2673 return (Elf_Addr)entry;
2677 #ifdef ELF_FUNCTION_DESC
2683 static FunctionDesc functionTable[FUNCTION_TABLE_SIZE];
2684 static unsigned int functionTableIndex;
2687 allocateFunctionDesc(Elf_Addr target)
2689 FunctionDesc *entry;
2691 if (functionTableIndex >= FUNCTION_TABLE_SIZE)
2692 barf("Function table overflow");
2694 entry = &functionTable[functionTableIndex++];
2696 entry->gp = (Elf_Addr)gp_val;
2697 return (Elf_Addr)entry;
2701 copyFunctionDesc(Elf_Addr target)
2703 FunctionDesc *olddesc = (FunctionDesc *)target;
2704 FunctionDesc *newdesc;
2706 newdesc = (FunctionDesc *)allocateFunctionDesc(olddesc->ip);
2707 newdesc->gp = olddesc->gp;
2708 return (Elf_Addr)newdesc;
2713 #ifdef ia64_HOST_ARCH
2714 static void ia64_reloc_gprel22(Elf_Addr target, Elf_Addr value);
2715 static void ia64_reloc_pcrel21(Elf_Addr target, Elf_Addr value, ObjectCode *oc);
2717 static unsigned char plt_code[] =
2719 /* taken from binutils bfd/elfxx-ia64.c */
2720 0x0b, 0x78, 0x00, 0x02, 0x00, 0x24, /* [MMI] addl r15=0,r1;; */
2721 0x00, 0x41, 0x3c, 0x30, 0x28, 0xc0, /* ld8 r16=[r15],8 */
2722 0x01, 0x08, 0x00, 0x84, /* mov r14=r1;; */
2723 0x11, 0x08, 0x00, 0x1e, 0x18, 0x10, /* [MIB] ld8 r1=[r15] */
2724 0x60, 0x80, 0x04, 0x80, 0x03, 0x00, /* mov b6=r16 */
2725 0x60, 0x00, 0x80, 0x00 /* br.few b6;; */
2728 /* If we can't get to the function descriptor via gp, take a local copy of it */
2729 #define PLT_RELOC(code, target) { \
2730 Elf64_Sxword rel_value = target - gp_val; \
2731 if ((rel_value > 0x1fffff) || (rel_value < -0x1fffff)) \
2732 ia64_reloc_gprel22((Elf_Addr)code, copyFunctionDesc(target)); \
2734 ia64_reloc_gprel22((Elf_Addr)code, target); \
2739 unsigned char code[sizeof(plt_code)];
2743 allocatePLTEntry(Elf_Addr target, ObjectCode *oc)
2745 PLTEntry *plt = (PLTEntry *)oc->plt;
2748 if (oc->pltIndex >= PLT_SIZE)
2749 barf("Procedure table overflow");
2751 entry = &plt[oc->pltIndex++];
2752 memcpy(entry->code, plt_code, sizeof(entry->code));
2753 PLT_RELOC(entry->code, target);
2754 return (Elf_Addr)entry;
2760 return (PLT_SIZE * sizeof(PLTEntry));
2765 #if x86_64_HOST_ARCH
2766 // On x86_64, 32-bit relocations are often used, which requires that
2767 // we can resolve a symbol to a 32-bit offset. However, shared
2768 // libraries are placed outside the 2Gb area, which leaves us with a
2769 // problem when we need to give a 32-bit offset to a symbol in a
2772 // For a function symbol, we can allocate a bounce sequence inside the
2773 // 2Gb area and resolve the symbol to this. The bounce sequence is
2774 // simply a long jump instruction to the real location of the symbol.
2776 // For data references, we're screwed.
2779 unsigned char jmp[8]; /* 6 byte instruction: jmpq *0x00000002(%rip) */
2783 #define X86_64_BB_SIZE 1024
2785 static x86_64_bounce *x86_64_bounce_buffer = NULL;
2786 static nat x86_64_bb_next_off;
2789 x86_64_high_symbol( char *lbl, void *addr )
2791 x86_64_bounce *bounce;
2793 if ( x86_64_bounce_buffer == NULL ||
2794 x86_64_bb_next_off >= X86_64_BB_SIZE ) {
2795 x86_64_bounce_buffer =
2796 mmap(NULL, X86_64_BB_SIZE * sizeof(x86_64_bounce),
2797 PROT_EXEC|PROT_READ|PROT_WRITE,
2798 MAP_PRIVATE|MAP_32BIT|MAP_ANONYMOUS, -1, 0);
2799 if (x86_64_bounce_buffer == MAP_FAILED) {
2800 barf("x86_64_high_symbol: mmap failed");
2802 x86_64_bb_next_off = 0;
2804 bounce = &x86_64_bounce_buffer[x86_64_bb_next_off];
2805 bounce->jmp[0] = 0xff;
2806 bounce->jmp[1] = 0x25;
2807 bounce->jmp[2] = 0x02;
2808 bounce->jmp[3] = 0x00;
2809 bounce->jmp[4] = 0x00;
2810 bounce->jmp[5] = 0x00;
2811 bounce->addr = addr;
2812 x86_64_bb_next_off++;
2814 IF_DEBUG(linker, debugBelch("x86_64: allocated bounce entry for %s->%p at %p\n",
2815 lbl, addr, bounce));
2817 insertStrHashTable(symhash, lbl, bounce);
2824 * Generic ELF functions
2828 findElfSection ( void* objImage, Elf_Word sh_type )
2830 char* ehdrC = (char*)objImage;
2831 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2832 Elf_Shdr* shdr = (Elf_Shdr*)(ehdrC + ehdr->e_shoff);
2833 char* sh_strtab = ehdrC + shdr[ehdr->e_shstrndx].sh_offset;
2837 for (i = 0; i < ehdr->e_shnum; i++) {
2838 if (shdr[i].sh_type == sh_type
2839 /* Ignore the section header's string table. */
2840 && i != ehdr->e_shstrndx
2841 /* Ignore string tables named .stabstr, as they contain
2843 && 0 != memcmp(".stabstr", sh_strtab + shdr[i].sh_name, 8)
2845 ptr = ehdrC + shdr[i].sh_offset;
2852 #if defined(ia64_HOST_ARCH)
2854 findElfSegment ( void* objImage, Elf_Addr vaddr )
2856 char* ehdrC = (char*)objImage;
2857 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2858 Elf_Phdr* phdr = (Elf_Phdr*)(ehdrC + ehdr->e_phoff);
2859 Elf_Addr segaddr = 0;
2862 for (i = 0; i < ehdr->e_phnum; i++) {
2863 segaddr = phdr[i].p_vaddr;
2864 if ((vaddr >= segaddr) && (vaddr < segaddr + phdr[i].p_memsz))
2872 ocVerifyImage_ELF ( ObjectCode* oc )
2876 int i, j, nent, nstrtab, nsymtabs;
2880 char* ehdrC = (char*)(oc->image);
2881 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2883 if (ehdr->e_ident[EI_MAG0] != ELFMAG0 ||
2884 ehdr->e_ident[EI_MAG1] != ELFMAG1 ||
2885 ehdr->e_ident[EI_MAG2] != ELFMAG2 ||
2886 ehdr->e_ident[EI_MAG3] != ELFMAG3) {
2887 errorBelch("%s: not an ELF object", oc->fileName);
2891 if (ehdr->e_ident[EI_CLASS] != ELFCLASS) {
2892 errorBelch("%s: unsupported ELF format", oc->fileName);
2896 if (ehdr->e_ident[EI_DATA] == ELFDATA2LSB) {
2897 IF_DEBUG(linker,debugBelch( "Is little-endian\n" ));
2899 if (ehdr->e_ident[EI_DATA] == ELFDATA2MSB) {
2900 IF_DEBUG(linker,debugBelch( "Is big-endian\n" ));
2902 errorBelch("%s: unknown endiannness", oc->fileName);
2906 if (ehdr->e_type != ET_REL) {
2907 errorBelch("%s: not a relocatable object (.o) file", oc->fileName);
2910 IF_DEBUG(linker, debugBelch( "Is a relocatable object (.o) file\n" ));
2912 IF_DEBUG(linker,debugBelch( "Architecture is " ));
2913 switch (ehdr->e_machine) {
2914 case EM_386: IF_DEBUG(linker,debugBelch( "x86" )); break;
2915 #ifdef EM_SPARC32PLUS
2916 case EM_SPARC32PLUS:
2918 case EM_SPARC: IF_DEBUG(linker,debugBelch( "sparc" )); break;
2920 case EM_IA_64: IF_DEBUG(linker,debugBelch( "ia64" )); break;
2922 case EM_PPC: IF_DEBUG(linker,debugBelch( "powerpc32" )); break;
2924 case EM_X86_64: IF_DEBUG(linker,debugBelch( "x86_64" )); break;
2926 default: IF_DEBUG(linker,debugBelch( "unknown" ));
2927 errorBelch("%s: unknown architecture", oc->fileName);
2931 IF_DEBUG(linker,debugBelch(
2932 "\nSection header table: start %ld, n_entries %d, ent_size %d\n",
2933 (long)ehdr->e_shoff, ehdr->e_shnum, ehdr->e_shentsize ));
2935 ASSERT (ehdr->e_shentsize == sizeof(Elf_Shdr));
2937 shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
2939 if (ehdr->e_shstrndx == SHN_UNDEF) {
2940 errorBelch("%s: no section header string table", oc->fileName);
2943 IF_DEBUG(linker,debugBelch( "Section header string table is section %d\n",
2945 sh_strtab = ehdrC + shdr[ehdr->e_shstrndx].sh_offset;
2948 for (i = 0; i < ehdr->e_shnum; i++) {
2949 IF_DEBUG(linker,debugBelch("%2d: ", i ));
2950 IF_DEBUG(linker,debugBelch("type=%2d ", (int)shdr[i].sh_type ));
2951 IF_DEBUG(linker,debugBelch("size=%4d ", (int)shdr[i].sh_size ));
2952 IF_DEBUG(linker,debugBelch("offs=%4d ", (int)shdr[i].sh_offset ));
2953 IF_DEBUG(linker,debugBelch(" (%p .. %p) ",
2954 ehdrC + shdr[i].sh_offset,
2955 ehdrC + shdr[i].sh_offset + shdr[i].sh_size - 1));
2957 if (shdr[i].sh_type == SHT_REL) {
2958 IF_DEBUG(linker,debugBelch("Rel " ));
2959 } else if (shdr[i].sh_type == SHT_RELA) {
2960 IF_DEBUG(linker,debugBelch("RelA " ));
2962 IF_DEBUG(linker,debugBelch(" "));
2965 IF_DEBUG(linker,debugBelch("sname=%s\n", sh_strtab + shdr[i].sh_name ));
2969 IF_DEBUG(linker,debugBelch( "\nString tables" ));
2972 for (i = 0; i < ehdr->e_shnum; i++) {
2973 if (shdr[i].sh_type == SHT_STRTAB
2974 /* Ignore the section header's string table. */
2975 && i != ehdr->e_shstrndx
2976 /* Ignore string tables named .stabstr, as they contain
2978 && 0 != memcmp(".stabstr", sh_strtab + shdr[i].sh_name, 8)
2980 IF_DEBUG(linker,debugBelch(" section %d is a normal string table", i ));
2981 strtab = ehdrC + shdr[i].sh_offset;
2986 errorBelch("%s: no string tables, or too many", oc->fileName);
2991 IF_DEBUG(linker,debugBelch( "\nSymbol tables" ));
2992 for (i = 0; i < ehdr->e_shnum; i++) {
2993 if (shdr[i].sh_type != SHT_SYMTAB) continue;
2994 IF_DEBUG(linker,debugBelch( "section %d is a symbol table\n", i ));
2996 stab = (Elf_Sym*) (ehdrC + shdr[i].sh_offset);
2997 nent = shdr[i].sh_size / sizeof(Elf_Sym);
2998 IF_DEBUG(linker,debugBelch( " number of entries is apparently %d (%ld rem)\n",
3000 (long)shdr[i].sh_size % sizeof(Elf_Sym)
3002 if (0 != shdr[i].sh_size % sizeof(Elf_Sym)) {
3003 errorBelch("%s: non-integral number of symbol table entries", oc->fileName);
3006 for (j = 0; j < nent; j++) {
3007 IF_DEBUG(linker,debugBelch(" %2d ", j ));
3008 IF_DEBUG(linker,debugBelch(" sec=%-5d size=%-3d val=%5p ",
3009 (int)stab[j].st_shndx,
3010 (int)stab[j].st_size,
3011 (char*)stab[j].st_value ));
3013 IF_DEBUG(linker,debugBelch("type=" ));
3014 switch (ELF_ST_TYPE(stab[j].st_info)) {
3015 case STT_NOTYPE: IF_DEBUG(linker,debugBelch("notype " )); break;
3016 case STT_OBJECT: IF_DEBUG(linker,debugBelch("object " )); break;
3017 case STT_FUNC : IF_DEBUG(linker,debugBelch("func " )); break;
3018 case STT_SECTION: IF_DEBUG(linker,debugBelch("section" )); break;
3019 case STT_FILE: IF_DEBUG(linker,debugBelch("file " )); break;
3020 default: IF_DEBUG(linker,debugBelch("? " )); break;
3022 IF_DEBUG(linker,debugBelch(" " ));
3024 IF_DEBUG(linker,debugBelch("bind=" ));
3025 switch (ELF_ST_BIND(stab[j].st_info)) {
3026 case STB_LOCAL : IF_DEBUG(linker,debugBelch("local " )); break;
3027 case STB_GLOBAL: IF_DEBUG(linker,debugBelch("global" )); break;
3028 case STB_WEAK : IF_DEBUG(linker,debugBelch("weak " )); break;
3029 default: IF_DEBUG(linker,debugBelch("? " )); break;
3031 IF_DEBUG(linker,debugBelch(" " ));
3033 IF_DEBUG(linker,debugBelch("name=%s\n", strtab + stab[j].st_name ));
3037 if (nsymtabs == 0) {
3038 errorBelch("%s: didn't find any symbol tables", oc->fileName);
3045 static int getSectionKind_ELF( Elf_Shdr *hdr, int *is_bss )
3049 if (hdr->sh_type == SHT_PROGBITS
3050 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_EXECINSTR)) {
3051 /* .text-style section */
3052 return SECTIONKIND_CODE_OR_RODATA;
3055 if (hdr->sh_type == SHT_PROGBITS
3056 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_WRITE)) {
3057 /* .data-style section */
3058 return SECTIONKIND_RWDATA;
3061 if (hdr->sh_type == SHT_PROGBITS
3062 && (hdr->sh_flags & SHF_ALLOC) && !(hdr->sh_flags & SHF_WRITE)) {
3063 /* .rodata-style section */
3064 return SECTIONKIND_CODE_OR_RODATA;
3067 if (hdr->sh_type == SHT_NOBITS
3068 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_WRITE)) {
3069 /* .bss-style section */
3071 return SECTIONKIND_RWDATA;
3074 return SECTIONKIND_OTHER;
3079 ocGetNames_ELF ( ObjectCode* oc )
3084 char* ehdrC = (char*)(oc->image);
3085 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
3086 char* strtab = findElfSection ( ehdrC, SHT_STRTAB );
3087 Elf_Shdr* shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
3089 ASSERT(symhash != NULL);
3092 errorBelch("%s: no strtab", oc->fileName);
3097 for (i = 0; i < ehdr->e_shnum; i++) {
3098 /* Figure out what kind of section it is. Logic derived from
3099 Figure 1.14 ("Special Sections") of the ELF document
3100 ("Portable Formats Specification, Version 1.1"). */
3102 SectionKind kind = getSectionKind_ELF(&shdr[i], &is_bss);
3104 if (is_bss && shdr[i].sh_size > 0) {
3105 /* This is a non-empty .bss section. Allocate zeroed space for
3106 it, and set its .sh_offset field such that
3107 ehdrC + .sh_offset == addr_of_zeroed_space. */
3108 char* zspace = stgCallocBytes(1, shdr[i].sh_size,
3109 "ocGetNames_ELF(BSS)");
3110 shdr[i].sh_offset = ((char*)zspace) - ((char*)ehdrC);
3112 debugBelch("BSS section at 0x%x, size %d\n",
3113 zspace, shdr[i].sh_size);
3117 /* fill in the section info */
3118 if (kind != SECTIONKIND_OTHER && shdr[i].sh_size > 0) {
3119 addProddableBlock(oc, ehdrC + shdr[i].sh_offset, shdr[i].sh_size);
3120 addSection(oc, kind, ehdrC + shdr[i].sh_offset,
3121 ehdrC + shdr[i].sh_offset + shdr[i].sh_size - 1);
3124 if (shdr[i].sh_type != SHT_SYMTAB) continue;
3126 /* copy stuff into this module's object symbol table */
3127 stab = (Elf_Sym*) (ehdrC + shdr[i].sh_offset);
3128 nent = shdr[i].sh_size / sizeof(Elf_Sym);
3130 oc->n_symbols = nent;
3131 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
3132 "ocGetNames_ELF(oc->symbols)");
3134 for (j = 0; j < nent; j++) {
3136 char isLocal = FALSE; /* avoids uninit-var warning */
3138 char* nm = strtab + stab[j].st_name;
3139 int secno = stab[j].st_shndx;
3141 /* Figure out if we want to add it; if so, set ad to its
3142 address. Otherwise leave ad == NULL. */
3144 if (secno == SHN_COMMON) {
3146 ad = stgCallocBytes(1, stab[j].st_size, "ocGetNames_ELF(COMMON)");
3148 debugBelch("COMMON symbol, size %d name %s\n",
3149 stab[j].st_size, nm);
3151 /* Pointless to do addProddableBlock() for this area,
3152 since the linker should never poke around in it. */
3155 if ( ( ELF_ST_BIND(stab[j].st_info)==STB_GLOBAL
3156 || ELF_ST_BIND(stab[j].st_info)==STB_LOCAL
3158 /* and not an undefined symbol */
3159 && stab[j].st_shndx != SHN_UNDEF
3160 /* and not in a "special section" */
3161 && stab[j].st_shndx < SHN_LORESERVE
3163 /* and it's a not a section or string table or anything silly */
3164 ( ELF_ST_TYPE(stab[j].st_info)==STT_FUNC ||
3165 ELF_ST_TYPE(stab[j].st_info)==STT_OBJECT ||
3166 ELF_ST_TYPE(stab[j].st_info)==STT_NOTYPE
3169 /* Section 0 is the undefined section, hence > and not >=. */
3170 ASSERT(secno > 0 && secno < ehdr->e_shnum);
3172 if (shdr[secno].sh_type == SHT_NOBITS) {
3173 debugBelch(" BSS symbol, size %d off %d name %s\n",
3174 stab[j].st_size, stab[j].st_value, nm);
3177 ad = ehdrC + shdr[ secno ].sh_offset + stab[j].st_value;
3178 if (ELF_ST_BIND(stab[j].st_info)==STB_LOCAL) {
3181 #ifdef ELF_FUNCTION_DESC
3182 /* dlsym() and the initialisation table both give us function
3183 * descriptors, so to be consistent we store function descriptors
3184 * in the symbol table */
3185 if (ELF_ST_TYPE(stab[j].st_info) == STT_FUNC)
3186 ad = (char *)allocateFunctionDesc((Elf_Addr)ad);
3188 IF_DEBUG(linker,debugBelch( "addOTabName(GLOB): %10p %s %s",
3189 ad, oc->fileName, nm ));
3194 /* And the decision is ... */
3198 oc->symbols[j] = nm;
3201 /* Ignore entirely. */
3203 ghciInsertStrHashTable(oc->fileName, symhash, nm, ad);
3207 IF_DEBUG(linker,debugBelch( "skipping `%s'\n",
3208 strtab + stab[j].st_name ));
3211 "skipping bind = %d, type = %d, shndx = %d `%s'\n",
3212 (int)ELF_ST_BIND(stab[j].st_info),
3213 (int)ELF_ST_TYPE(stab[j].st_info),
3214 (int)stab[j].st_shndx,
3215 strtab + stab[j].st_name
3218 oc->symbols[j] = NULL;
3227 /* Do ELF relocations which lack an explicit addend. All x86-linux
3228 relocations appear to be of this form. */
3230 do_Elf_Rel_relocations ( ObjectCode* oc, char* ehdrC,
3231 Elf_Shdr* shdr, int shnum,
3232 Elf_Sym* stab, char* strtab )
3237 Elf_Rel* rtab = (Elf_Rel*) (ehdrC + shdr[shnum].sh_offset);
3238 int nent = shdr[shnum].sh_size / sizeof(Elf_Rel);
3239 int target_shndx = shdr[shnum].sh_info;
3240 int symtab_shndx = shdr[shnum].sh_link;
3242 stab = (Elf_Sym*) (ehdrC + shdr[ symtab_shndx ].sh_offset);
3243 targ = (Elf_Word*)(ehdrC + shdr[ target_shndx ].sh_offset);
3244 IF_DEBUG(linker,debugBelch( "relocations for section %d using symtab %d\n",
3245 target_shndx, symtab_shndx ));
3247 /* Skip sections that we're not interested in. */
3250 SectionKind kind = getSectionKind_ELF(&shdr[target_shndx], &is_bss);
3251 if (kind == SECTIONKIND_OTHER) {
3252 IF_DEBUG(linker,debugBelch( "skipping (target section not loaded)"));
3257 for (j = 0; j < nent; j++) {
3258 Elf_Addr offset = rtab[j].r_offset;
3259 Elf_Addr info = rtab[j].r_info;
3261 Elf_Addr P = ((Elf_Addr)targ) + offset;
3262 Elf_Word* pP = (Elf_Word*)P;
3267 StgStablePtr stablePtr;
3270 IF_DEBUG(linker,debugBelch( "Rel entry %3d is raw(%6p %6p)",
3271 j, (void*)offset, (void*)info ));
3273 IF_DEBUG(linker,debugBelch( " ZERO" ));
3276 Elf_Sym sym = stab[ELF_R_SYM(info)];
3277 /* First see if it is a local symbol. */
3278 if (ELF_ST_BIND(sym.st_info) == STB_LOCAL) {
3279 /* Yes, so we can get the address directly from the ELF symbol
3281 symbol = sym.st_name==0 ? "(noname)" : strtab+sym.st_name;
3283 (ehdrC + shdr[ sym.st_shndx ].sh_offset
3284 + stab[ELF_R_SYM(info)].st_value);
3287 symbol = strtab + sym.st_name;
3288 stablePtr = (StgStablePtr)lookupHashTable(stablehash, (StgWord)symbol);
3289 if (NULL == stablePtr) {
3290 /* No, so look up the name in our global table. */
3291 S_tmp = lookupSymbol( symbol );
3292 S = (Elf_Addr)S_tmp;
3294 stableVal = deRefStablePtr( stablePtr );
3295 addRootObject((void*)P);
3297 S = (Elf_Addr)S_tmp;
3301 errorBelch("%s: unknown symbol `%s'", oc->fileName, symbol);
3304 IF_DEBUG(linker,debugBelch( "`%s' resolves to %p\n", symbol, (void*)S ));
3307 IF_DEBUG(linker,debugBelch( "Reloc: P = %p S = %p A = %p\n",
3308 (void*)P, (void*)S, (void*)A ));
3309 checkProddableBlock ( oc, pP );
3313 switch (ELF_R_TYPE(info)) {
3314 # ifdef i386_HOST_ARCH
3315 case R_386_32: *pP = value; break;
3316 case R_386_PC32: *pP = value - P; break;
3319 errorBelch("%s: unhandled ELF relocation(Rel) type %lu\n",
3320 oc->fileName, (lnat)ELF_R_TYPE(info));
3328 /* Do ELF relocations for which explicit addends are supplied.
3329 sparc-solaris relocations appear to be of this form. */
3331 do_Elf_Rela_relocations ( ObjectCode* oc, char* ehdrC,
3332 Elf_Shdr* shdr, int shnum,
3333 Elf_Sym* stab, char* strtab )
3336 char *symbol = NULL;
3338 Elf_Rela* rtab = (Elf_Rela*) (ehdrC + shdr[shnum].sh_offset);
3339 int nent = shdr[shnum].sh_size / sizeof(Elf_Rela);
3340 int target_shndx = shdr[shnum].sh_info;
3341 int symtab_shndx = shdr[shnum].sh_link;
3343 stab = (Elf_Sym*) (ehdrC + shdr[ symtab_shndx ].sh_offset);
3344 targ = (Elf_Addr) (ehdrC + shdr[ target_shndx ].sh_offset);
3345 IF_DEBUG(linker,debugBelch( "relocations for section %d using symtab %d\n",
3346 target_shndx, symtab_shndx ));
3348 for (j = 0; j < nent; j++) {
3349 #if defined(DEBUG) || defined(sparc_HOST_ARCH) || defined(ia64_HOST_ARCH) || defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH)
3350 /* This #ifdef only serves to avoid unused-var warnings. */
3351 Elf_Addr offset = rtab[j].r_offset;
3352 Elf_Addr P = targ + offset;
3354 Elf_Addr info = rtab[j].r_info;
3355 Elf_Addr A = rtab[j].r_addend;
3359 # if defined(sparc_HOST_ARCH)
3360 Elf_Word* pP = (Elf_Word*)P;
3362 # elif defined(ia64_HOST_ARCH)
3363 Elf64_Xword *pP = (Elf64_Xword *)P;
3365 # elif defined(powerpc_HOST_ARCH)
3369 IF_DEBUG(linker,debugBelch( "Rel entry %3d is raw(%6p %6p %6p) ",
3370 j, (void*)offset, (void*)info,
3373 IF_DEBUG(linker,debugBelch( " ZERO" ));
3376 Elf_Sym sym = stab[ELF_R_SYM(info)];
3377 /* First see if it is a local symbol. */
3378 if (ELF_ST_BIND(sym.st_info) == STB_LOCAL) {
3379 /* Yes, so we can get the address directly from the ELF symbol
3381 symbol = sym.st_name==0 ? "(noname)" : strtab+sym.st_name;
3383 (ehdrC + shdr[ sym.st_shndx ].sh_offset
3384 + stab[ELF_R_SYM(info)].st_value);
3385 #ifdef ELF_FUNCTION_DESC
3386 /* Make a function descriptor for this function */
3387 if (S && ELF_ST_TYPE(sym.st_info) == STT_FUNC) {
3388 S = allocateFunctionDesc(S + A);
3393 /* No, so look up the name in our global table. */
3394 symbol = strtab + sym.st_name;
3395 S_tmp = lookupSymbol( symbol );
3396 S = (Elf_Addr)S_tmp;
3398 #ifdef ELF_FUNCTION_DESC
3399 /* If a function, already a function descriptor - we would
3400 have to copy it to add an offset. */
3401 if (S && (ELF_ST_TYPE(sym.st_info) == STT_FUNC) && (A != 0))
3402 errorBelch("%s: function %s with addend %p", oc->fileName, symbol, (void *)A);
3406 errorBelch("%s: unknown symbol `%s'", oc->fileName, symbol);
3409 IF_DEBUG(linker,debugBelch( "`%s' resolves to %p", symbol, (void*)S ));
3412 IF_DEBUG(linker,debugBelch("Reloc: P = %p S = %p A = %p\n",
3413 (void*)P, (void*)S, (void*)A ));
3414 /* checkProddableBlock ( oc, (void*)P ); */
3418 switch (ELF_R_TYPE(info)) {
3419 # if defined(sparc_HOST_ARCH)
3420 case R_SPARC_WDISP30:
3421 w1 = *pP & 0xC0000000;
3422 w2 = (Elf_Word)((value - P) >> 2);
3423 ASSERT((w2 & 0xC0000000) == 0);
3428 w1 = *pP & 0xFFC00000;
3429 w2 = (Elf_Word)(value >> 10);
3430 ASSERT((w2 & 0xFFC00000) == 0);
3436 w2 = (Elf_Word)(value & 0x3FF);
3437 ASSERT((w2 & ~0x3FF) == 0);
3441 /* According to the Sun documentation:
3443 This relocation type resembles R_SPARC_32, except it refers to an
3444 unaligned word. That is, the word to be relocated must be treated
3445 as four separate bytes with arbitrary alignment, not as a word
3446 aligned according to the architecture requirements.
3448 (JRS: which means that freeloading on the R_SPARC_32 case
3449 is probably wrong, but hey ...)
3453 w2 = (Elf_Word)value;
3456 # elif defined(ia64_HOST_ARCH)
3457 case R_IA64_DIR64LSB:
3458 case R_IA64_FPTR64LSB:
3461 case R_IA64_PCREL64LSB:
3464 case R_IA64_SEGREL64LSB:
3465 addr = findElfSegment(ehdrC, value);
3468 case R_IA64_GPREL22:
3469 ia64_reloc_gprel22(P, value);
3471 case R_IA64_LTOFF22:
3472 case R_IA64_LTOFF22X:
3473 case R_IA64_LTOFF_FPTR22:
3474 addr = allocateGOTEntry(value);
3475 ia64_reloc_gprel22(P, addr);
3477 case R_IA64_PCREL21B:
3478 ia64_reloc_pcrel21(P, S, oc);
3481 /* This goes with R_IA64_LTOFF22X and points to the load to
3482 * convert into a move. We don't implement relaxation. */
3484 # elif defined(powerpc_HOST_ARCH)
3485 case R_PPC_ADDR16_LO:
3486 *(Elf32_Half*) P = value;
3489 case R_PPC_ADDR16_HI:
3490 *(Elf32_Half*) P = value >> 16;
3493 case R_PPC_ADDR16_HA:
3494 *(Elf32_Half*) P = (value + 0x8000) >> 16;
3498 *(Elf32_Word *) P = value;
3502 *(Elf32_Word *) P = value - P;
3508 if( delta << 6 >> 6 != delta )
3510 value = makeJumpIsland( oc, ELF_R_SYM(info), value );
3513 if( value == 0 || delta << 6 >> 6 != delta )
3515 barf( "Unable to make ppcJumpIsland for #%d",
3521 *(Elf_Word *) P = (*(Elf_Word *) P & 0xfc000003)
3522 | (delta & 0x3fffffc);
3526 #if x86_64_HOST_ARCH
3528 *(Elf64_Xword *)P = value;
3533 StgInt64 off = value - P;
3534 if (off >= 0x7fffffffL || off < -0x80000000L) {
3535 barf("R_X86_64_PC32 relocation out of range: %s = %p",
3538 *(Elf64_Word *)P = (Elf64_Word)off;
3543 if (value >= 0x7fffffffL) {
3544 barf("R_X86_64_32 relocation out of range: %s = %p\n",
3547 *(Elf64_Word *)P = (Elf64_Word)value;
3551 if ((StgInt64)value > 0x7fffffffL || (StgInt64)value < -0x80000000L) {
3552 barf("R_X86_64_32S relocation out of range: %s = %p\n",
3555 *(Elf64_Sword *)P = (Elf64_Sword)value;
3560 errorBelch("%s: unhandled ELF relocation(RelA) type %lu\n",
3561 oc->fileName, (lnat)ELF_R_TYPE(info));
3570 ocResolve_ELF ( ObjectCode* oc )
3574 Elf_Sym* stab = NULL;
3575 char* ehdrC = (char*)(oc->image);
3576 Elf_Ehdr* ehdr = (Elf_Ehdr*) ehdrC;
3577 Elf_Shdr* shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
3579 /* first find "the" symbol table */
3580 stab = (Elf_Sym*) findElfSection ( ehdrC, SHT_SYMTAB );
3582 /* also go find the string table */
3583 strtab = findElfSection ( ehdrC, SHT_STRTAB );
3585 if (stab == NULL || strtab == NULL) {
3586 errorBelch("%s: can't find string or symbol table", oc->fileName);
3590 /* Process the relocation sections. */
3591 for (shnum = 0; shnum < ehdr->e_shnum; shnum++) {
3592 if (shdr[shnum].sh_type == SHT_REL) {
3593 ok = do_Elf_Rel_relocations ( oc, ehdrC, shdr,
3594 shnum, stab, strtab );
3598 if (shdr[shnum].sh_type == SHT_RELA) {
3599 ok = do_Elf_Rela_relocations ( oc, ehdrC, shdr,
3600 shnum, stab, strtab );
3605 /* Free the local symbol table; we won't need it again. */
3606 freeHashTable(oc->lochash, NULL);
3609 #if defined(powerpc_HOST_ARCH)
3610 ocFlushInstructionCache( oc );
3618 * Instructions are 41 bits long, packed into 128 bit bundles with a 5-bit template
3619 * at the front. The following utility functions pack and unpack instructions, and
3620 * take care of the most common relocations.
3623 #ifdef ia64_HOST_ARCH
3626 ia64_extract_instruction(Elf64_Xword *target)
3629 int slot = (Elf_Addr)target & 3;
3630 target = (Elf_Addr)target & ~3;
3638 return ((w1 >> 5) & 0x1ffffffffff);
3640 return (w1 >> 46) | ((w2 & 0x7fffff) << 18);
3644 barf("ia64_extract_instruction: invalid slot %p", target);
3649 ia64_deposit_instruction(Elf64_Xword *target, Elf64_Xword value)
3651 int slot = (Elf_Addr)target & 3;
3652 target = (Elf_Addr)target & ~3;
3657 *target |= value << 5;
3660 *target |= value << 46;
3661 *(target+1) |= value >> 18;
3664 *(target+1) |= value << 23;
3670 ia64_reloc_gprel22(Elf_Addr target, Elf_Addr value)
3672 Elf64_Xword instruction;
3673 Elf64_Sxword rel_value;
3675 rel_value = value - gp_val;
3676 if ((rel_value > 0x1fffff) || (rel_value < -0x1fffff))
3677 barf("GP-relative data out of range (address = 0x%lx, gp = 0x%lx)", value, gp_val);
3679 instruction = ia64_extract_instruction((Elf64_Xword *)target);
3680 instruction |= (((rel_value >> 0) & 0x07f) << 13) /* imm7b */
3681 | (((rel_value >> 7) & 0x1ff) << 27) /* imm9d */
3682 | (((rel_value >> 16) & 0x01f) << 22) /* imm5c */
3683 | ((Elf64_Xword)(rel_value < 0) << 36); /* s */
3684 ia64_deposit_instruction((Elf64_Xword *)target, instruction);
3688 ia64_reloc_pcrel21(Elf_Addr target, Elf_Addr value, ObjectCode *oc)
3690 Elf64_Xword instruction;
3691 Elf64_Sxword rel_value;
3694 entry = allocatePLTEntry(value, oc);
3696 rel_value = (entry >> 4) - (target >> 4);
3697 if ((rel_value > 0xfffff) || (rel_value < -0xfffff))
3698 barf("PLT entry too far away (entry = 0x%lx, target = 0x%lx)", entry, target);
3700 instruction = ia64_extract_instruction((Elf64_Xword *)target);
3701 instruction |= ((rel_value & 0xfffff) << 13) /* imm20b */
3702 | ((Elf64_Xword)(rel_value < 0) << 36); /* s */
3703 ia64_deposit_instruction((Elf64_Xword *)target, instruction);
3709 * PowerPC ELF specifics
3712 #ifdef powerpc_HOST_ARCH
3714 static int ocAllocateJumpIslands_ELF( ObjectCode *oc )
3720 ehdr = (Elf_Ehdr *) oc->image;
3721 shdr = (Elf_Shdr *) ( ((char *)oc->image) + ehdr->e_shoff );
3723 for( i = 0; i < ehdr->e_shnum; i++ )
3724 if( shdr[i].sh_type == SHT_SYMTAB )
3727 if( i == ehdr->e_shnum )
3729 errorBelch( "This ELF file contains no symtab" );
3733 if( shdr[i].sh_entsize != sizeof( Elf_Sym ) )
3735 errorBelch( "The entry size (%d) of the symtab isn't %d\n",
3736 shdr[i].sh_entsize, sizeof( Elf_Sym ) );
3741 return ocAllocateJumpIslands( oc, shdr[i].sh_size / sizeof( Elf_Sym ), 0 );
3744 #endif /* powerpc */
3748 /* --------------------------------------------------------------------------
3750 * ------------------------------------------------------------------------*/
3752 #if defined(OBJFORMAT_MACHO)
3755 Support for MachO linking on Darwin/MacOS X
3756 by Wolfgang Thaller (wolfgang.thaller@gmx.net)
3758 I hereby formally apologize for the hackish nature of this code.
3759 Things that need to be done:
3760 *) implement ocVerifyImage_MachO
3761 *) add still more sanity checks.
3764 #ifdef powerpc_HOST_ARCH
3765 static int ocAllocateJumpIslands_MachO(ObjectCode* oc)
3767 struct mach_header *header = (struct mach_header *) oc->image;
3768 struct load_command *lc = (struct load_command *) (header + 1);
3771 for( i = 0; i < header->ncmds; i++ )
3773 if( lc->cmd == LC_SYMTAB )
3775 // Find out the first and last undefined external
3776 // symbol, so we don't have to allocate too many
3778 struct symtab_command *symLC = (struct symtab_command *) lc;
3779 unsigned min = symLC->nsyms, max = 0;
3780 struct nlist *nlist =
3781 symLC ? (struct nlist*) ((char*) oc->image + symLC->symoff)
3783 for(i=0;i<symLC->nsyms;i++)
3785 if(nlist[i].n_type & N_STAB)
3787 else if(nlist[i].n_type & N_EXT)
3789 if((nlist[i].n_type & N_TYPE) == N_UNDF
3790 && (nlist[i].n_value == 0))
3800 return ocAllocateJumpIslands(oc, max - min + 1, min);
3805 lc = (struct load_command *) ( ((char *)lc) + lc->cmdsize );
3807 return ocAllocateJumpIslands(oc,0,0);
3811 static int ocVerifyImage_MachO(ObjectCode* oc STG_UNUSED)
3813 // FIXME: do some verifying here
3817 static int resolveImports(
3820 struct symtab_command *symLC,
3821 struct section *sect, // ptr to lazy or non-lazy symbol pointer section
3822 unsigned long *indirectSyms,
3823 struct nlist *nlist)
3826 size_t itemSize = 4;
3829 int isJumpTable = 0;
3830 if(!strcmp(sect->sectname,"__jump_table"))
3834 ASSERT(sect->reserved2 == itemSize);
3838 for(i=0; i*itemSize < sect->size;i++)
3840 // according to otool, reserved1 contains the first index into the indirect symbol table
3841 struct nlist *symbol = &nlist[indirectSyms[sect->reserved1+i]];
3842 char *nm = image + symLC->stroff + symbol->n_un.n_strx;
3845 if((symbol->n_type & N_TYPE) == N_UNDF
3846 && (symbol->n_type & N_EXT) && (symbol->n_value != 0))
3847 addr = (void*) (symbol->n_value);
3848 else if((addr = lookupLocalSymbol(oc,nm)) != NULL)
3851 addr = lookupSymbol(nm);
3854 errorBelch("\n%s: unknown symbol `%s'", oc->fileName, nm);
3862 checkProddableBlock(oc,image + sect->offset + i*itemSize);
3863 *(image + sect->offset + i*itemSize) = 0xe9; // jmp
3864 *(unsigned*)(image + sect->offset + i*itemSize + 1)
3865 = (char*)addr - (image + sect->offset + i*itemSize + 5);
3870 checkProddableBlock(oc,((void**)(image + sect->offset)) + i);
3871 ((void**)(image + sect->offset))[i] = addr;
3878 static unsigned long relocateAddress(
3881 struct section* sections,
3882 unsigned long address)
3885 for(i = 0; i < nSections; i++)
3887 if(sections[i].addr <= address
3888 && address < sections[i].addr + sections[i].size)
3890 return (unsigned long)oc->image
3891 + sections[i].offset + address - sections[i].addr;
3894 barf("Invalid Mach-O file:"
3895 "Address out of bounds while relocating object file");
3899 static int relocateSection(
3902 struct symtab_command *symLC, struct nlist *nlist,
3903 int nSections, struct section* sections, struct section *sect)
3905 struct relocation_info *relocs;
3908 if(!strcmp(sect->sectname,"__la_symbol_ptr"))
3910 else if(!strcmp(sect->sectname,"__nl_symbol_ptr"))
3912 else if(!strcmp(sect->sectname,"__la_sym_ptr2"))
3914 else if(!strcmp(sect->sectname,"__la_sym_ptr3"))
3918 relocs = (struct relocation_info*) (image + sect->reloff);
3922 if(relocs[i].r_address & R_SCATTERED)
3924 struct scattered_relocation_info *scat =
3925 (struct scattered_relocation_info*) &relocs[i];
3929 if(scat->r_length == 2)
3931 unsigned long word = 0;
3932 unsigned long* wordPtr = (unsigned long*) (image + sect->offset + scat->r_address);
3933 checkProddableBlock(oc,wordPtr);
3935 // Note on relocation types:
3936 // i386 uses the GENERIC_RELOC_* types,
3937 // while ppc uses special PPC_RELOC_* types.
3938 // *_RELOC_VANILLA and *_RELOC_PAIR have the same value
3939 // in both cases, all others are different.
3940 // Therefore, we use GENERIC_RELOC_VANILLA
3941 // and GENERIC_RELOC_PAIR instead of the PPC variants,
3942 // and use #ifdefs for the other types.
3944 // Step 1: Figure out what the relocated value should be
3945 if(scat->r_type == GENERIC_RELOC_VANILLA)
3947 word = *wordPtr + (unsigned long) relocateAddress(
3954 #ifdef powerpc_HOST_ARCH
3955 else if(scat->r_type == PPC_RELOC_SECTDIFF
3956 || scat->r_type == PPC_RELOC_LO16_SECTDIFF
3957 || scat->r_type == PPC_RELOC_HI16_SECTDIFF
3958 || scat->r_type == PPC_RELOC_HA16_SECTDIFF)
3960 else if(scat->r_type == GENERIC_RELOC_SECTDIFF)
3963 struct scattered_relocation_info *pair =
3964 (struct scattered_relocation_info*) &relocs[i+1];
3966 if(!pair->r_scattered || pair->r_type != GENERIC_RELOC_PAIR)
3967 barf("Invalid Mach-O file: "
3968 "RELOC_*_SECTDIFF not followed by RELOC_PAIR");
3970 word = (unsigned long)
3971 (relocateAddress(oc, nSections, sections, scat->r_value)
3972 - relocateAddress(oc, nSections, sections, pair->r_value));
3975 #ifdef powerpc_HOST_ARCH
3976 else if(scat->r_type == PPC_RELOC_HI16
3977 || scat->r_type == PPC_RELOC_LO16
3978 || scat->r_type == PPC_RELOC_HA16
3979 || scat->r_type == PPC_RELOC_LO14)
3980 { // these are generated by label+offset things
3981 struct relocation_info *pair = &relocs[i+1];
3982 if((pair->r_address & R_SCATTERED) || pair->r_type != PPC_RELOC_PAIR)
3983 barf("Invalid Mach-O file: "
3984 "PPC_RELOC_* not followed by PPC_RELOC_PAIR");
3986 if(scat->r_type == PPC_RELOC_LO16)
3988 word = ((unsigned short*) wordPtr)[1];
3989 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
3991 else if(scat->r_type == PPC_RELOC_LO14)
3993 barf("Unsupported Relocation: PPC_RELOC_LO14");
3994 word = ((unsigned short*) wordPtr)[1] & 0xFFFC;
3995 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
3997 else if(scat->r_type == PPC_RELOC_HI16)
3999 word = ((unsigned short*) wordPtr)[1] << 16;
4000 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF);
4002 else if(scat->r_type == PPC_RELOC_HA16)
4004 word = ((unsigned short*) wordPtr)[1] << 16;
4005 word += ((short)relocs[i+1].r_address & (short)0xFFFF);
4009 word += (unsigned long) relocateAddress(oc, nSections, sections, scat->r_value)
4016 continue; // ignore the others
4018 #ifdef powerpc_HOST_ARCH
4019 if(scat->r_type == GENERIC_RELOC_VANILLA
4020 || scat->r_type == PPC_RELOC_SECTDIFF)
4022 if(scat->r_type == GENERIC_RELOC_VANILLA
4023 || scat->r_type == GENERIC_RELOC_SECTDIFF)
4028 #ifdef powerpc_HOST_ARCH
4029 else if(scat->r_type == PPC_RELOC_LO16_SECTDIFF || scat->r_type == PPC_RELOC_LO16)
4031 ((unsigned short*) wordPtr)[1] = word & 0xFFFF;
4033 else if(scat->r_type == PPC_RELOC_HI16_SECTDIFF || scat->r_type == PPC_RELOC_HI16)
4035 ((unsigned short*) wordPtr)[1] = (word >> 16) & 0xFFFF;
4037 else if(scat->r_type == PPC_RELOC_HA16_SECTDIFF || scat->r_type == PPC_RELOC_HA16)
4039 ((unsigned short*) wordPtr)[1] = ((word >> 16) & 0xFFFF)
4040 + ((word & (1<<15)) ? 1 : 0);
4046 continue; // FIXME: I hope it's OK to ignore all the others.
4050 struct relocation_info *reloc = &relocs[i];
4051 if(reloc->r_pcrel && !reloc->r_extern)
4054 if(reloc->r_length == 2)
4056 unsigned long word = 0;
4057 #ifdef powerpc_HOST_ARCH
4058 unsigned long jumpIsland = 0;
4059 long offsetToJumpIsland = 0xBADBAD42; // initialise to bad value
4060 // to avoid warning and to catch
4064 unsigned long* wordPtr = (unsigned long*) (image + sect->offset + reloc->r_address);
4065 checkProddableBlock(oc,wordPtr);
4067 if(reloc->r_type == GENERIC_RELOC_VANILLA)
4071 #ifdef powerpc_HOST_ARCH
4072 else if(reloc->r_type == PPC_RELOC_LO16)
4074 word = ((unsigned short*) wordPtr)[1];
4075 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
4077 else if(reloc->r_type == PPC_RELOC_HI16)
4079 word = ((unsigned short*) wordPtr)[1] << 16;
4080 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF);
4082 else if(reloc->r_type == PPC_RELOC_HA16)
4084 word = ((unsigned short*) wordPtr)[1] << 16;
4085 word += ((short)relocs[i+1].r_address & (short)0xFFFF);
4087 else if(reloc->r_type == PPC_RELOC_BR24)
4090 word = (word & 0x03FFFFFC) | ((word & 0x02000000) ? 0xFC000000 : 0);
4094 if(!reloc->r_extern)
4097 sections[reloc->r_symbolnum-1].offset
4098 - sections[reloc->r_symbolnum-1].addr
4105 struct nlist *symbol = &nlist[reloc->r_symbolnum];
4106 char *nm = image + symLC->stroff + symbol->n_un.n_strx;
4107 void *symbolAddress = lookupSymbol(nm);
4110 errorBelch("\nunknown symbol `%s'", nm);
4116 #ifdef powerpc_HOST_ARCH
4117 // In the .o file, this should be a relative jump to NULL
4118 // and we'll change it to a relative jump to the symbol
4119 ASSERT(-word == reloc->r_address);
4120 jumpIsland = makeJumpIsland(oc,reloc->r_symbolnum,(unsigned long) symbolAddress);
4123 offsetToJumpIsland = word + jumpIsland
4124 - (((long)image) + sect->offset - sect->addr);
4127 word += (unsigned long) symbolAddress
4128 - (((long)image) + sect->offset - sect->addr);
4132 word += (unsigned long) symbolAddress;
4136 if(reloc->r_type == GENERIC_RELOC_VANILLA)
4141 #ifdef powerpc_HOST_ARCH
4142 else if(reloc->r_type == PPC_RELOC_LO16)
4144 ((unsigned short*) wordPtr)[1] = word & 0xFFFF;
4147 else if(reloc->r_type == PPC_RELOC_HI16)
4149 ((unsigned short*) wordPtr)[1] = (word >> 16) & 0xFFFF;
4152 else if(reloc->r_type == PPC_RELOC_HA16)
4154 ((unsigned short*) wordPtr)[1] = ((word >> 16) & 0xFFFF)
4155 + ((word & (1<<15)) ? 1 : 0);
4158 else if(reloc->r_type == PPC_RELOC_BR24)
4160 if((long)word > (long)0x01FFFFFF || (long)word < (long)0xFFE00000)
4162 // The branch offset is too large.
4163 // Therefore, we try to use a jump island.
4166 barf("unconditional relative branch out of range: "
4167 "no jump island available");
4170 word = offsetToJumpIsland;
4171 if((long)word > (long)0x01FFFFFF || (long)word < (long)0xFFE00000)
4172 barf("unconditional relative branch out of range: "
4173 "jump island out of range");
4175 *wordPtr = (*wordPtr & 0xFC000003) | (word & 0x03FFFFFC);
4180 barf("\nunknown relocation %d",reloc->r_type);
4187 static int ocGetNames_MachO(ObjectCode* oc)
4189 char *image = (char*) oc->image;
4190 struct mach_header *header = (struct mach_header*) image;
4191 struct load_command *lc = (struct load_command*) (image + sizeof(struct mach_header));
4192 unsigned i,curSymbol = 0;
4193 struct segment_command *segLC = NULL;
4194 struct section *sections;
4195 struct symtab_command *symLC = NULL;
4196 struct nlist *nlist;
4197 unsigned long commonSize = 0;
4198 char *commonStorage = NULL;
4199 unsigned long commonCounter;
4201 for(i=0;i<header->ncmds;i++)
4203 if(lc->cmd == LC_SEGMENT)
4204 segLC = (struct segment_command*) lc;
4205 else if(lc->cmd == LC_SYMTAB)
4206 symLC = (struct symtab_command*) lc;
4207 lc = (struct load_command *) ( ((char*)lc) + lc->cmdsize );
4210 sections = (struct section*) (segLC+1);
4211 nlist = symLC ? (struct nlist*) (image + symLC->symoff)
4214 for(i=0;i<segLC->nsects;i++)
4216 if(sections[i].size == 0)
4219 if((sections[i].flags & SECTION_TYPE) == S_ZEROFILL)
4221 char * zeroFillArea = stgCallocBytes(1,sections[i].size,
4222 "ocGetNames_MachO(common symbols)");
4223 sections[i].offset = zeroFillArea - image;
4226 if(!strcmp(sections[i].sectname,"__text"))
4227 addSection(oc, SECTIONKIND_CODE_OR_RODATA,
4228 (void*) (image + sections[i].offset),
4229 (void*) (image + sections[i].offset + sections[i].size));
4230 else if(!strcmp(sections[i].sectname,"__const"))
4231 addSection(oc, SECTIONKIND_RWDATA,
4232 (void*) (image + sections[i].offset),
4233 (void*) (image + sections[i].offset + sections[i].size));
4234 else if(!strcmp(sections[i].sectname,"__data"))
4235 addSection(oc, SECTIONKIND_RWDATA,
4236 (void*) (image + sections[i].offset),
4237 (void*) (image + sections[i].offset + sections[i].size));
4238 else if(!strcmp(sections[i].sectname,"__bss")
4239 || !strcmp(sections[i].sectname,"__common"))
4240 addSection(oc, SECTIONKIND_RWDATA,
4241 (void*) (image + sections[i].offset),
4242 (void*) (image + sections[i].offset + sections[i].size));
4244 addProddableBlock(oc, (void*) (image + sections[i].offset),
4248 // count external symbols defined here
4252 for(i=0;i<symLC->nsyms;i++)
4254 if(nlist[i].n_type & N_STAB)
4256 else if(nlist[i].n_type & N_EXT)
4258 if((nlist[i].n_type & N_TYPE) == N_UNDF
4259 && (nlist[i].n_value != 0))
4261 commonSize += nlist[i].n_value;
4264 else if((nlist[i].n_type & N_TYPE) == N_SECT)
4269 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
4270 "ocGetNames_MachO(oc->symbols)");
4274 for(i=0;i<symLC->nsyms;i++)
4276 if(nlist[i].n_type & N_STAB)
4278 else if((nlist[i].n_type & N_TYPE) == N_SECT)
4280 if(nlist[i].n_type & N_EXT)
4282 char *nm = image + symLC->stroff + nlist[i].n_un.n_strx;
4283 ghciInsertStrHashTable(oc->fileName, symhash, nm,
4285 + sections[nlist[i].n_sect-1].offset
4286 - sections[nlist[i].n_sect-1].addr
4287 + nlist[i].n_value);
4288 oc->symbols[curSymbol++] = nm;
4292 char *nm = image + symLC->stroff + nlist[i].n_un.n_strx;
4293 ghciInsertStrHashTable(oc->fileName, oc->lochash, nm,
4295 + sections[nlist[i].n_sect-1].offset
4296 - sections[nlist[i].n_sect-1].addr
4297 + nlist[i].n_value);
4303 commonStorage = stgCallocBytes(1,commonSize,"ocGetNames_MachO(common symbols)");
4304 commonCounter = (unsigned long)commonStorage;
4307 for(i=0;i<symLC->nsyms;i++)
4309 if((nlist[i].n_type & N_TYPE) == N_UNDF
4310 && (nlist[i].n_type & N_EXT) && (nlist[i].n_value != 0))
4312 char *nm = image + symLC->stroff + nlist[i].n_un.n_strx;
4313 unsigned long sz = nlist[i].n_value;
4315 nlist[i].n_value = commonCounter;
4317 ghciInsertStrHashTable(oc->fileName, symhash, nm,
4318 (void*)commonCounter);
4319 oc->symbols[curSymbol++] = nm;
4321 commonCounter += sz;
4328 static int ocResolve_MachO(ObjectCode* oc)
4330 char *image = (char*) oc->image;
4331 struct mach_header *header = (struct mach_header*) image;
4332 struct load_command *lc = (struct load_command*) (image + sizeof(struct mach_header));
4334 struct segment_command *segLC = NULL;
4335 struct section *sections;
4336 struct symtab_command *symLC = NULL;
4337 struct dysymtab_command *dsymLC = NULL;
4338 struct nlist *nlist;
4340 for(i=0;i<header->ncmds;i++)
4342 if(lc->cmd == LC_SEGMENT)
4343 segLC = (struct segment_command*) lc;
4344 else if(lc->cmd == LC_SYMTAB)
4345 symLC = (struct symtab_command*) lc;
4346 else if(lc->cmd == LC_DYSYMTAB)
4347 dsymLC = (struct dysymtab_command*) lc;
4348 lc = (struct load_command *) ( ((char*)lc) + lc->cmdsize );
4351 sections = (struct section*) (segLC+1);
4352 nlist = symLC ? (struct nlist*) (image + symLC->symoff)
4357 unsigned long *indirectSyms
4358 = (unsigned long*) (image + dsymLC->indirectsymoff);
4360 for(i=0;i<segLC->nsects;i++)
4362 if( !strcmp(sections[i].sectname,"__la_symbol_ptr")
4363 || !strcmp(sections[i].sectname,"__la_sym_ptr2")
4364 || !strcmp(sections[i].sectname,"__la_sym_ptr3"))
4366 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4369 else if(!strcmp(sections[i].sectname,"__nl_symbol_ptr")
4370 || !strcmp(sections[i].sectname,"__pointers"))
4372 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4375 else if(!strcmp(sections[i].sectname,"__jump_table"))
4377 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4383 for(i=0;i<segLC->nsects;i++)
4385 if(!relocateSection(oc,image,symLC,nlist,segLC->nsects,sections,§ions[i]))
4389 /* Free the local symbol table; we won't need it again. */
4390 freeHashTable(oc->lochash, NULL);
4393 #if defined (powerpc_HOST_ARCH)
4394 ocFlushInstructionCache( oc );
4400 #ifdef powerpc_HOST_ARCH
4402 * The Mach-O object format uses leading underscores. But not everywhere.
4403 * There is a small number of runtime support functions defined in
4404 * libcc_dynamic.a whose name does not have a leading underscore.
4405 * As a consequence, we can't get their address from C code.
4406 * We have to use inline assembler just to take the address of a function.
4410 static void machoInitSymbolsWithoutUnderscore()
4412 extern void* symbolsWithoutUnderscore[];
4413 void **p = symbolsWithoutUnderscore;
4414 __asm__ volatile(".globl _symbolsWithoutUnderscore\n.data\n_symbolsWithoutUnderscore:");
4418 __asm__ volatile(".long " # x);
4420 RTS_MACHO_NOUNDERLINE_SYMBOLS
4422 __asm__ volatile(".text");
4426 ghciInsertStrHashTable("(GHCi built-in symbols)", symhash, #x, *p++);
4428 RTS_MACHO_NOUNDERLINE_SYMBOLS
4435 * Figure out by how much to shift the entire Mach-O file in memory
4436 * when loading so that its single segment ends up 16-byte-aligned
4438 static int machoGetMisalignment( FILE * f )
4440 struct mach_header header;
4443 fread(&header, sizeof(header), 1, f);
4446 if(header.magic != MH_MAGIC)
4449 misalignment = (header.sizeofcmds + sizeof(header))
4452 return misalignment ? (16 - misalignment) : 0;