1 /* -----------------------------------------------------------------------------
3 * (c) The GHC Team, 2000-2004
7 * ---------------------------------------------------------------------------*/
10 #include "PosixSource.h"
13 /* Linux needs _GNU_SOURCE to get RTLD_DEFAULT from <dlfcn.h> and
14 MREMAP_MAYMOVE from <sys/mman.h>.
25 #include "LinkerInternals.h"
31 #ifdef HAVE_SYS_TYPES_H
32 #include <sys/types.h>
38 #ifdef HAVE_SYS_STAT_H
42 #if defined(HAVE_DLFCN_H)
46 #if defined(cygwin32_HOST_OS)
51 #ifdef HAVE_SYS_TIME_H
55 #include <sys/fcntl.h>
56 #include <sys/termios.h>
57 #include <sys/utime.h>
58 #include <sys/utsname.h>
62 #if defined(ia64_HOST_ARCH) || defined(openbsd_HOST_OS) || defined(linux_HOST_OS) || defined(freebsd_HOST_OS)
67 #if defined(openbsd_HOST_OS) || defined(linux_HOST_OS) || defined(freebsd_HOST_OS)
75 #if defined(linux_HOST_OS) || defined(solaris2_HOST_OS) || defined(freebsd_HOST_OS) || defined(netbsd_HOST_OS) || defined(openbsd_HOST_OS)
76 # define OBJFORMAT_ELF
77 #elif defined(cygwin32_HOST_OS) || defined (mingw32_HOST_OS)
78 # define OBJFORMAT_PEi386
81 #elif defined(darwin_HOST_OS)
82 # define OBJFORMAT_MACHO
83 # include <mach-o/loader.h>
84 # include <mach-o/nlist.h>
85 # include <mach-o/reloc.h>
86 # include <mach-o/dyld.h>
87 #if defined(powerpc_HOST_ARCH)
88 # include <mach-o/ppc/reloc.h>
92 /* Hash table mapping symbol names to Symbol */
93 static /*Str*/HashTable *symhash;
99 /* Hash table mapping symbol names to StgStablePtr */
100 static /*Str*/HashTable *stablehash;
101 rootEntry *root_ptr_table = NULL;
102 static rootEntry *root_ptr_free = NULL;
104 static unsigned int RPT_size = 0;
106 /* List of currently loaded objects */
107 ObjectCode *objects = NULL; /* initially empty */
109 #if defined(OBJFORMAT_ELF)
110 static int ocVerifyImage_ELF ( ObjectCode* oc );
111 static int ocGetNames_ELF ( ObjectCode* oc );
112 static int ocResolve_ELF ( ObjectCode* oc );
113 #if defined(powerpc_HOST_ARCH)
114 static int ocAllocateJumpIslands_ELF ( ObjectCode* oc );
116 #elif defined(OBJFORMAT_PEi386)
117 static int ocVerifyImage_PEi386 ( ObjectCode* oc );
118 static int ocGetNames_PEi386 ( ObjectCode* oc );
119 static int ocResolve_PEi386 ( ObjectCode* oc );
120 #elif defined(OBJFORMAT_MACHO)
121 static int ocVerifyImage_MachO ( ObjectCode* oc );
122 static int ocGetNames_MachO ( ObjectCode* oc );
123 static int ocResolve_MachO ( ObjectCode* oc );
125 static int machoGetMisalignment( FILE * );
126 #ifdef powerpc_HOST_ARCH
127 static int ocAllocateJumpIslands_MachO ( ObjectCode* oc );
128 static void machoInitSymbolsWithoutUnderscore( void );
132 #if defined(x86_64_HOST_ARCH)
133 static void*x86_64_high_symbol( char *lbl, void *addr );
136 /* -----------------------------------------------------------------------------
137 * Built-in symbols from the RTS
140 typedef struct _RtsSymbolVal {
147 #define Maybe_Stable_Names SymX(mkWeakzh_fast) \
148 SymX(makeStableNamezh_fast) \
149 SymX(finalizzeWeakzh_fast)
151 /* These are not available in GUM!!! -- HWL */
152 #define Maybe_Stable_Names
155 #if !defined (mingw32_HOST_OS)
156 #define RTS_POSIX_ONLY_SYMBOLS \
157 SymX(signal_handlers) \
158 SymX(stg_sig_install) \
162 #if defined (cygwin32_HOST_OS)
163 #define RTS_MINGW_ONLY_SYMBOLS /**/
164 /* Don't have the ability to read import libs / archives, so
165 * we have to stupidly list a lot of what libcygwin.a
168 #define RTS_CYGWIN_ONLY_SYMBOLS \
246 #elif !defined(mingw32_HOST_OS)
247 #define RTS_MINGW_ONLY_SYMBOLS /**/
248 #define RTS_CYGWIN_ONLY_SYMBOLS /**/
249 #else /* defined(mingw32_HOST_OS) */
250 #define RTS_POSIX_ONLY_SYMBOLS /**/
251 #define RTS_CYGWIN_ONLY_SYMBOLS /**/
253 /* Extra syms gen'ed by mingw-2's gcc-3.2: */
255 #define RTS_MINGW_EXTRA_SYMS \
256 Sym(_imp____mb_cur_max) \
259 #define RTS_MINGW_EXTRA_SYMS
262 /* These are statically linked from the mingw libraries into the ghc
263 executable, so we have to employ this hack. */
264 #define RTS_MINGW_ONLY_SYMBOLS \
265 SymX(asyncReadzh_fast) \
266 SymX(asyncWritezh_fast) \
267 SymX(asyncDoProczh_fast) \
279 SymX(getservbyname) \
280 SymX(getservbyport) \
281 SymX(getprotobynumber) \
282 SymX(getprotobyname) \
283 SymX(gethostbyname) \
284 SymX(gethostbyaddr) \
331 SymX(rts_InstallConsoleEvent) \
332 SymX(rts_ConsoleHandlerDone) \
334 Sym(_imp___timezone) \
343 RTS_MINGW_EXTRA_SYMS \
347 #if defined(darwin_TARGET_OS) && HAVE_PRINTF_LDBLSTUB
348 #define RTS_DARWIN_ONLY_SYMBOLS \
349 Sym(asprintf$LDBLStub) \
353 Sym(fprintf$LDBLStub) \
354 Sym(fscanf$LDBLStub) \
355 Sym(fwprintf$LDBLStub) \
356 Sym(fwscanf$LDBLStub) \
357 Sym(printf$LDBLStub) \
358 Sym(scanf$LDBLStub) \
359 Sym(snprintf$LDBLStub) \
360 Sym(sprintf$LDBLStub) \
361 Sym(sscanf$LDBLStub) \
362 Sym(strtold$LDBLStub) \
363 Sym(swprintf$LDBLStub) \
364 Sym(swscanf$LDBLStub) \
365 Sym(syslog$LDBLStub) \
366 Sym(vasprintf$LDBLStub) \
368 Sym(verrc$LDBLStub) \
369 Sym(verrx$LDBLStub) \
370 Sym(vfprintf$LDBLStub) \
371 Sym(vfscanf$LDBLStub) \
372 Sym(vfwprintf$LDBLStub) \
373 Sym(vfwscanf$LDBLStub) \
374 Sym(vprintf$LDBLStub) \
375 Sym(vscanf$LDBLStub) \
376 Sym(vsnprintf$LDBLStub) \
377 Sym(vsprintf$LDBLStub) \
378 Sym(vsscanf$LDBLStub) \
379 Sym(vswprintf$LDBLStub) \
380 Sym(vswscanf$LDBLStub) \
381 Sym(vsyslog$LDBLStub) \
382 Sym(vwarn$LDBLStub) \
383 Sym(vwarnc$LDBLStub) \
384 Sym(vwarnx$LDBLStub) \
385 Sym(vwprintf$LDBLStub) \
386 Sym(vwscanf$LDBLStub) \
388 Sym(warnc$LDBLStub) \
389 Sym(warnx$LDBLStub) \
390 Sym(wcstold$LDBLStub) \
391 Sym(wprintf$LDBLStub) \
394 #define RTS_DARWIN_ONLY_SYMBOLS
398 # define MAIN_CAP_SYM SymX(MainCapability)
400 # define MAIN_CAP_SYM
403 #if !defined(mingw32_HOST_OS)
404 #define RTS_USER_SIGNALS_SYMBOLS \
405 SymX(setIOManagerPipe)
407 #define RTS_USER_SIGNALS_SYMBOLS /* nothing */
410 #ifdef TABLES_NEXT_TO_CODE
411 #define RTS_RET_SYMBOLS /* nothing */
413 #define RTS_RET_SYMBOLS \
414 SymX(stg_enter_ret) \
415 SymX(stg_gc_fun_ret) \
422 SymX(stg_ap_pv_ret) \
423 SymX(stg_ap_pp_ret) \
424 SymX(stg_ap_ppv_ret) \
425 SymX(stg_ap_ppp_ret) \
426 SymX(stg_ap_pppv_ret) \
427 SymX(stg_ap_pppp_ret) \
428 SymX(stg_ap_ppppp_ret) \
429 SymX(stg_ap_pppppp_ret)
432 #define RTS_SYMBOLS \
435 SymX(stg_enter_info) \
436 SymX(stg_gc_void_info) \
437 SymX(__stg_gc_enter_1) \
438 SymX(stg_gc_noregs) \
439 SymX(stg_gc_unpt_r1_info) \
440 SymX(stg_gc_unpt_r1) \
441 SymX(stg_gc_unbx_r1_info) \
442 SymX(stg_gc_unbx_r1) \
443 SymX(stg_gc_f1_info) \
445 SymX(stg_gc_d1_info) \
447 SymX(stg_gc_l1_info) \
450 SymX(stg_gc_fun_info) \
452 SymX(stg_gc_gen_info) \
453 SymX(stg_gc_gen_hp) \
455 SymX(stg_gen_yield) \
456 SymX(stg_yield_noregs) \
457 SymX(stg_yield_to_interpreter) \
458 SymX(stg_gen_block) \
459 SymX(stg_block_noregs) \
461 SymX(stg_block_takemvar) \
462 SymX(stg_block_putmvar) \
463 SymX(stg_seq_frame_info) \
465 SymX(MallocFailHook) \
467 SymX(OutOfHeapHook) \
468 SymX(StackOverflowHook) \
469 SymX(__encodeDouble) \
470 SymX(__encodeFloat) \
474 SymX(__gmpz_cmp_si) \
475 SymX(__gmpz_cmp_ui) \
476 SymX(__gmpz_get_si) \
477 SymX(__gmpz_get_ui) \
478 SymX(__int_encodeDouble) \
479 SymX(__int_encodeFloat) \
480 SymX(andIntegerzh_fast) \
481 SymX(atomicallyzh_fast) \
485 SymX(blockAsyncExceptionszh_fast) \
487 SymX(catchRetryzh_fast) \
488 SymX(catchSTMzh_fast) \
489 SymX(closure_flags) \
491 SymX(cmpIntegerzh_fast) \
492 SymX(cmpIntegerIntzh_fast) \
493 SymX(complementIntegerzh_fast) \
494 SymX(createAdjustor) \
495 SymX(decodeDoublezh_fast) \
496 SymX(decodeFloatzh_fast) \
499 SymX(deRefWeakzh_fast) \
500 SymX(deRefStablePtrzh_fast) \
501 SymX(dirty_MUT_VAR) \
502 SymX(divExactIntegerzh_fast) \
503 SymX(divModIntegerzh_fast) \
505 SymX(forkOnzh_fast) \
507 SymX(forkOS_createThread) \
508 SymX(freeHaskellFunctionPtr) \
509 SymX(freeStablePtr) \
510 SymX(gcdIntegerzh_fast) \
511 SymX(gcdIntegerIntzh_fast) \
512 SymX(gcdIntzh_fast) \
521 SymX(hs_perform_gc) \
522 SymX(hs_free_stable_ptr) \
523 SymX(hs_free_fun_ptr) \
525 SymX(int2Integerzh_fast) \
526 SymX(integer2Intzh_fast) \
527 SymX(integer2Wordzh_fast) \
528 SymX(isCurrentThreadBoundzh_fast) \
529 SymX(isDoubleDenormalized) \
530 SymX(isDoubleInfinite) \
532 SymX(isDoubleNegativeZero) \
533 SymX(isEmptyMVarzh_fast) \
534 SymX(isFloatDenormalized) \
535 SymX(isFloatInfinite) \
537 SymX(isFloatNegativeZero) \
538 SymX(killThreadzh_fast) \
540 SymX(insertStableSymbol) \
543 SymX(makeStablePtrzh_fast) \
544 SymX(minusIntegerzh_fast) \
545 SymX(mkApUpd0zh_fast) \
546 SymX(myThreadIdzh_fast) \
547 SymX(labelThreadzh_fast) \
548 SymX(newArrayzh_fast) \
549 SymX(newBCOzh_fast) \
550 SymX(newByteArrayzh_fast) \
551 SymX_redirect(newCAF, newDynCAF) \
552 SymX(newMVarzh_fast) \
553 SymX(newMutVarzh_fast) \
554 SymX(newTVarzh_fast) \
555 SymX(atomicModifyMutVarzh_fast) \
556 SymX(newPinnedByteArrayzh_fast) \
558 SymX(orIntegerzh_fast) \
560 SymX(performMajorGC) \
561 SymX(plusIntegerzh_fast) \
564 SymX(putMVarzh_fast) \
565 SymX(quotIntegerzh_fast) \
566 SymX(quotRemIntegerzh_fast) \
568 SymX(raiseIOzh_fast) \
569 SymX(readTVarzh_fast) \
570 SymX(remIntegerzh_fast) \
571 SymX(resetNonBlockingFd) \
576 SymX(rts_checkSchedStatus) \
579 SymX(rts_evalLazyIO) \
580 SymX(rts_evalStableIO) \
584 SymX(rts_getDouble) \
589 SymX(rts_getFunPtr) \
590 SymX(rts_getStablePtr) \
591 SymX(rts_getThreadId) \
593 SymX(rts_getWord32) \
606 SymX(rts_mkStablePtr) \
614 SymX(rtsSupportsBoundThreads) \
615 SymX(__hscore_get_saved_termios) \
616 SymX(__hscore_set_saved_termios) \
618 SymX(startupHaskell) \
619 SymX(shutdownHaskell) \
620 SymX(shutdownHaskellAndExit) \
621 SymX(stable_ptr_table) \
622 SymX(stackOverflow) \
623 SymX(stg_CAF_BLACKHOLE_info) \
624 SymX(awakenBlockedQueue) \
625 SymX(stg_CHARLIKE_closure) \
626 SymX(stg_EMPTY_MVAR_info) \
627 SymX(stg_IND_STATIC_info) \
628 SymX(stg_INTLIKE_closure) \
629 SymX(stg_MUT_ARR_PTRS_DIRTY_info) \
630 SymX(stg_MUT_ARR_PTRS_FROZEN_info) \
631 SymX(stg_MUT_ARR_PTRS_FROZEN0_info) \
632 SymX(stg_WEAK_info) \
633 SymX(stg_ap_v_info) \
634 SymX(stg_ap_f_info) \
635 SymX(stg_ap_d_info) \
636 SymX(stg_ap_l_info) \
637 SymX(stg_ap_n_info) \
638 SymX(stg_ap_p_info) \
639 SymX(stg_ap_pv_info) \
640 SymX(stg_ap_pp_info) \
641 SymX(stg_ap_ppv_info) \
642 SymX(stg_ap_ppp_info) \
643 SymX(stg_ap_pppv_info) \
644 SymX(stg_ap_pppp_info) \
645 SymX(stg_ap_ppppp_info) \
646 SymX(stg_ap_pppppp_info) \
647 SymX(stg_ap_0_fast) \
648 SymX(stg_ap_v_fast) \
649 SymX(stg_ap_f_fast) \
650 SymX(stg_ap_d_fast) \
651 SymX(stg_ap_l_fast) \
652 SymX(stg_ap_n_fast) \
653 SymX(stg_ap_p_fast) \
654 SymX(stg_ap_pv_fast) \
655 SymX(stg_ap_pp_fast) \
656 SymX(stg_ap_ppv_fast) \
657 SymX(stg_ap_ppp_fast) \
658 SymX(stg_ap_pppv_fast) \
659 SymX(stg_ap_pppp_fast) \
660 SymX(stg_ap_ppppp_fast) \
661 SymX(stg_ap_pppppp_fast) \
662 SymX(stg_ap_1_upd_info) \
663 SymX(stg_ap_2_upd_info) \
664 SymX(stg_ap_3_upd_info) \
665 SymX(stg_ap_4_upd_info) \
666 SymX(stg_ap_5_upd_info) \
667 SymX(stg_ap_6_upd_info) \
668 SymX(stg_ap_7_upd_info) \
670 SymX(stg_sel_0_upd_info) \
671 SymX(stg_sel_10_upd_info) \
672 SymX(stg_sel_11_upd_info) \
673 SymX(stg_sel_12_upd_info) \
674 SymX(stg_sel_13_upd_info) \
675 SymX(stg_sel_14_upd_info) \
676 SymX(stg_sel_15_upd_info) \
677 SymX(stg_sel_1_upd_info) \
678 SymX(stg_sel_2_upd_info) \
679 SymX(stg_sel_3_upd_info) \
680 SymX(stg_sel_4_upd_info) \
681 SymX(stg_sel_5_upd_info) \
682 SymX(stg_sel_6_upd_info) \
683 SymX(stg_sel_7_upd_info) \
684 SymX(stg_sel_8_upd_info) \
685 SymX(stg_sel_9_upd_info) \
686 SymX(stg_upd_frame_info) \
687 SymX(suspendThread) \
688 SymX(takeMVarzh_fast) \
689 SymX(timesIntegerzh_fast) \
690 SymX(tryPutMVarzh_fast) \
691 SymX(tryTakeMVarzh_fast) \
692 SymX(unblockAsyncExceptionszh_fast) \
694 SymX(unsafeThawArrayzh_fast) \
695 SymX(waitReadzh_fast) \
696 SymX(waitWritezh_fast) \
697 SymX(word2Integerzh_fast) \
698 SymX(writeTVarzh_fast) \
699 SymX(xorIntegerzh_fast) \
701 SymX(stg_interp_constr_entry) \
702 SymX(stg_interp_constr1_entry) \
703 SymX(stg_interp_constr2_entry) \
704 SymX(stg_interp_constr3_entry) \
705 SymX(stg_interp_constr4_entry) \
706 SymX(stg_interp_constr5_entry) \
707 SymX(stg_interp_constr6_entry) \
708 SymX(stg_interp_constr7_entry) \
709 SymX(stg_interp_constr8_entry) \
710 SymX(stgMallocBytesRWX) \
711 SymX(getAllocations) \
714 RTS_USER_SIGNALS_SYMBOLS
716 #ifdef SUPPORT_LONG_LONGS
717 #define RTS_LONG_LONG_SYMS \
718 SymX(int64ToIntegerzh_fast) \
719 SymX(word64ToIntegerzh_fast)
721 #define RTS_LONG_LONG_SYMS /* nothing */
724 // 64-bit support functions in libgcc.a
725 #if defined(__GNUC__) && SIZEOF_VOID_P <= 4
726 #define RTS_LIBGCC_SYMBOLS \
736 #elif defined(ia64_HOST_ARCH)
737 #define RTS_LIBGCC_SYMBOLS \
745 #define RTS_LIBGCC_SYMBOLS
748 #if defined(darwin_HOST_OS) && defined(powerpc_HOST_ARCH)
749 // Symbols that don't have a leading underscore
750 // on Mac OS X. They have to receive special treatment,
751 // see machoInitSymbolsWithoutUnderscore()
752 #define RTS_MACHO_NOUNDERLINE_SYMBOLS \
757 /* entirely bogus claims about types of these symbols */
758 #define Sym(vvv) extern void vvv(void);
759 #define SymX(vvv) /**/
760 #define SymX_redirect(vvv,xxx) /**/
764 RTS_POSIX_ONLY_SYMBOLS
765 RTS_MINGW_ONLY_SYMBOLS
766 RTS_CYGWIN_ONLY_SYMBOLS
767 RTS_DARWIN_ONLY_SYMBOLS
773 #ifdef LEADING_UNDERSCORE
774 #define MAYBE_LEADING_UNDERSCORE_STR(s) ("_" s)
776 #define MAYBE_LEADING_UNDERSCORE_STR(s) (s)
779 #define Sym(vvv) { MAYBE_LEADING_UNDERSCORE_STR(#vvv), \
781 #define SymX(vvv) Sym(vvv)
783 // SymX_redirect allows us to redirect references to one symbol to
784 // another symbol. See newCAF/newDynCAF for an example.
785 #define SymX_redirect(vvv,xxx) \
786 { MAYBE_LEADING_UNDERSCORE_STR(#vvv), \
789 static RtsSymbolVal rtsSyms[] = {
793 RTS_POSIX_ONLY_SYMBOLS
794 RTS_MINGW_ONLY_SYMBOLS
795 RTS_CYGWIN_ONLY_SYMBOLS
797 #if defined(darwin_HOST_OS) && defined(i386_HOST_ARCH)
798 // dyld stub code contains references to this,
799 // but it should never be called because we treat
800 // lazy pointers as nonlazy.
801 { "dyld_stub_binding_helper", (void*)0xDEADBEEF },
803 { 0, 0 } /* sentinel */
807 /* -----------------------------------------------------------------------------
808 * Utilities for handling root pointers.
809 * -------------------------------------------------------------------------- */
812 #define INIT_RPT_SIZE 64
815 initFreeList(rootEntry *table, nat n, rootEntry *free)
819 for (p = table + n - 1; p >= table; p--) {
823 root_ptr_free = table;
827 initRootPtrTable(void)
832 RPT_size = INIT_RPT_SIZE;
833 root_ptr_table = stgMallocBytes(RPT_size * sizeof(rootEntry),
836 initFreeList(root_ptr_table,INIT_RPT_SIZE,NULL);
841 enlargeRootPtrTable(void)
843 nat old_RPT_size = RPT_size;
845 // 2nd and subsequent times
848 stgReallocBytes(root_ptr_table,
849 RPT_size * sizeof(rootEntry),
850 "enlargeRootPtrTable");
852 initFreeList(root_ptr_table + old_RPT_size, old_RPT_size, NULL);
856 addRootObject(void *addr)
860 if (root_ptr_free == NULL) {
861 enlargeRootPtrTable();
864 rt = root_ptr_free - root_ptr_table;
865 root_ptr_free = (rootEntry*)(root_ptr_free->addr);
866 root_ptr_table[rt].addr = addr;
869 /* -----------------------------------------------------------------------------
870 * Treat root pointers as roots for the garbage collector.
871 * -------------------------------------------------------------------------- */
874 markRootPtrTable(evac_fn evac)
876 rootEntry *p, *end_root_ptr_table;
879 end_root_ptr_table = &root_ptr_table[RPT_size];
881 for (p = root_ptr_table; p < end_root_ptr_table; p++) {
884 if (q && (q < (P_)root_ptr_table || q >= (P_)end_root_ptr_table)) {
885 evac((StgClosure **)p->addr);
890 /* -----------------------------------------------------------------------------
891 * End of utilities for handling root pointers.
892 * -------------------------------------------------------------------------- */
895 /* -----------------------------------------------------------------------------
896 * Insert symbols into hash tables, checking for duplicates.
898 static void ghciInsertStrHashTable ( char* obj_name,
904 if (lookupHashTable(table, (StgWord)key) == NULL)
906 insertStrHashTable(table, (StgWord)key, data);
911 "GHCi runtime linker: fatal error: I found a duplicate definition for symbol\n"
913 "whilst processing object file\n"
915 "This could be caused by:\n"
916 " * Loading two different object files which export the same symbol\n"
917 " * Specifying the same object file twice on the GHCi command line\n"
918 " * An incorrect `package.conf' entry, causing some object to be\n"
920 "GHCi cannot safely continue in this situation. Exiting now. Sorry.\n"
929 /* -----------------------------------------------------------------------------
930 * initialize the object linker
934 static int linker_init_done = 0 ;
936 #if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
937 static void *dl_prog_handle;
940 /* dlopen(NULL,..) doesn't work so we grab libc explicitly */
941 #if defined(openbsd_HOST_OS)
942 static void *dl_libc_handle;
950 /* Make initLinker idempotent, so we can call it
951 before evey relevant operation; that means we
952 don't need to initialise the linker separately */
953 if (linker_init_done == 1) { return; } else {
954 linker_init_done = 1;
957 stablehash = allocStrHashTable();
958 symhash = allocStrHashTable();
960 /* populate the symbol table with stuff from the RTS */
961 for (sym = rtsSyms; sym->lbl != NULL; sym++) {
962 ghciInsertStrHashTable("(GHCi built-in symbols)",
963 symhash, sym->lbl, sym->addr);
965 # if defined(OBJFORMAT_MACHO) && defined(powerpc_HOST_ARCH)
966 machoInitSymbolsWithoutUnderscore();
969 # if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
970 # if defined(RTLD_DEFAULT)
971 dl_prog_handle = RTLD_DEFAULT;
973 dl_prog_handle = dlopen(NULL, RTLD_LAZY);
974 # if defined(openbsd_HOST_OS)
975 dl_libc_handle = dlopen("libc.so", RTLD_LAZY);
977 # endif /* RTLD_DEFAULT */
981 /* -----------------------------------------------------------------------------
982 * Loading DLL or .so dynamic libraries
983 * -----------------------------------------------------------------------------
985 * Add a DLL from which symbols may be found. In the ELF case, just
986 * do RTLD_GLOBAL-style add, so no further messing around needs to
987 * happen in order that symbols in the loaded .so are findable --
988 * lookupSymbol() will subsequently see them by dlsym on the program's
989 * dl-handle. Returns NULL if success, otherwise ptr to an err msg.
991 * In the PEi386 case, open the DLLs and put handles to them in a
992 * linked list. When looking for a symbol, try all handles in the
993 * list. This means that we need to load even DLLs that are guaranteed
994 * to be in the ghc.exe image already, just so we can get a handle
995 * to give to loadSymbol, so that we can find the symbols. For such
996 * libraries, the LoadLibrary call should be a no-op except for returning
1001 #if defined(OBJFORMAT_PEi386)
1002 /* A record for storing handles into DLLs. */
1007 struct _OpenedDLL* next;
1012 /* A list thereof. */
1013 static OpenedDLL* opened_dlls = NULL;
1017 addDLL( char *dll_name )
1019 # if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
1020 /* ------------------- ELF DLL loader ------------------- */
1026 hdl= dlopen(dll_name, RTLD_NOW | RTLD_GLOBAL);
1029 /* dlopen failed; return a ptr to the error msg. */
1031 if (errmsg == NULL) errmsg = "addDLL: unknown error";
1038 # elif defined(OBJFORMAT_PEi386)
1039 /* ------------------- Win32 DLL loader ------------------- */
1047 /* debugBelch("\naddDLL; dll_name = `%s'\n", dll_name); */
1049 /* See if we've already got it, and ignore if so. */
1050 for (o_dll = opened_dlls; o_dll != NULL; o_dll = o_dll->next) {
1051 if (0 == strcmp(o_dll->name, dll_name))
1055 /* The file name has no suffix (yet) so that we can try
1056 both foo.dll and foo.drv
1058 The documentation for LoadLibrary says:
1059 If no file name extension is specified in the lpFileName
1060 parameter, the default library extension .dll is
1061 appended. However, the file name string can include a trailing
1062 point character (.) to indicate that the module name has no
1065 buf = stgMallocBytes(strlen(dll_name) + 10, "addDLL");
1066 sprintf(buf, "%s.DLL", dll_name);
1067 instance = LoadLibrary(buf);
1068 if (instance == NULL) {
1069 sprintf(buf, "%s.DRV", dll_name); // KAA: allow loading of drivers (like winspool.drv)
1070 instance = LoadLibrary(buf);
1071 if (instance == NULL) {
1074 /* LoadLibrary failed; return a ptr to the error msg. */
1075 return "addDLL: unknown error";
1080 /* Add this DLL to the list of DLLs in which to search for symbols. */
1081 o_dll = stgMallocBytes( sizeof(OpenedDLL), "addDLL" );
1082 o_dll->name = stgMallocBytes(1+strlen(dll_name), "addDLL");
1083 strcpy(o_dll->name, dll_name);
1084 o_dll->instance = instance;
1085 o_dll->next = opened_dlls;
1086 opened_dlls = o_dll;
1090 barf("addDLL: not implemented on this platform");
1094 /* -----------------------------------------------------------------------------
1095 * insert a stable symbol in the hash table
1099 insertStableSymbol(char* obj_name, char* key, StgPtr p)
1101 ghciInsertStrHashTable(obj_name, stablehash, key, getStablePtr(p));
1105 /* -----------------------------------------------------------------------------
1106 * insert a symbol in the hash table
1109 insertSymbol(char* obj_name, char* key, void* data)
1111 ghciInsertStrHashTable(obj_name, symhash, key, data);
1114 /* -----------------------------------------------------------------------------
1115 * lookup a symbol in the hash table
1118 lookupSymbol( char *lbl )
1122 ASSERT(symhash != NULL);
1123 val = lookupStrHashTable(symhash, lbl);
1126 # if defined(OBJFORMAT_ELF)
1127 # if defined(openbsd_HOST_OS)
1128 val = dlsym(dl_prog_handle, lbl);
1129 return (val != NULL) ? val : dlsym(dl_libc_handle,lbl);
1130 # elif defined(x86_64_HOST_ARCH)
1131 val = dlsym(dl_prog_handle, lbl);
1132 if (val >= (void *)0x80000000) {
1134 new_val = x86_64_high_symbol(lbl, val);
1135 IF_DEBUG(linker,debugBelch("lookupSymbol: relocating out of range symbol: %s = %p, now %p\n", lbl, val, new_val));
1140 # else /* not openbsd */
1141 return dlsym(dl_prog_handle, lbl);
1143 # elif defined(OBJFORMAT_MACHO)
1144 if(NSIsSymbolNameDefined(lbl)) {
1145 NSSymbol symbol = NSLookupAndBindSymbol(lbl);
1146 return NSAddressOfSymbol(symbol);
1150 # elif defined(OBJFORMAT_PEi386)
1153 for (o_dll = opened_dlls; o_dll != NULL; o_dll = o_dll->next) {
1154 /* debugBelch("look in %s for %s\n", o_dll->name, lbl); */
1155 if (lbl[0] == '_') {
1156 /* HACK: if the name has an initial underscore, try stripping
1157 it off & look that up first. I've yet to verify whether there's
1158 a Rule that governs whether an initial '_' *should always* be
1159 stripped off when mapping from import lib name to the DLL name.
1161 sym = GetProcAddress(o_dll->instance, (lbl+1));
1163 /*debugBelch("found %s in %s\n", lbl+1,o_dll->name);*/
1167 sym = GetProcAddress(o_dll->instance, lbl);
1169 /*debugBelch("found %s in %s\n", lbl,o_dll->name);*/
1184 __attribute((unused))
1186 lookupLocalSymbol( ObjectCode* oc, char *lbl )
1190 val = lookupStrHashTable(oc->lochash, lbl);
1200 /* -----------------------------------------------------------------------------
1201 * Debugging aid: look in GHCi's object symbol tables for symbols
1202 * within DELTA bytes of the specified address, and show their names.
1205 void ghci_enquire ( char* addr );
1207 void ghci_enquire ( char* addr )
1212 const int DELTA = 64;
1217 for (oc = objects; oc; oc = oc->next) {
1218 for (i = 0; i < oc->n_symbols; i++) {
1219 sym = oc->symbols[i];
1220 if (sym == NULL) continue;
1221 // debugBelch("enquire %p %p\n", sym, oc->lochash);
1223 if (oc->lochash != NULL) {
1224 a = lookupStrHashTable(oc->lochash, sym);
1227 a = lookupStrHashTable(symhash, sym);
1230 // debugBelch("ghci_enquire: can't find %s\n", sym);
1232 else if (addr-DELTA <= a && a <= addr+DELTA) {
1233 debugBelch("%p + %3d == `%s'\n", addr, (int)(a - addr), sym);
1240 #ifdef ia64_HOST_ARCH
1241 static unsigned int PLTSize(void);
1244 /* -----------------------------------------------------------------------------
1245 * Load an obj (populate the global symbol table, but don't resolve yet)
1247 * Returns: 1 if ok, 0 on error.
1250 loadObj( char *path )
1257 void *map_addr = NULL;
1264 /* debugBelch("loadObj %s\n", path ); */
1266 /* Check that we haven't already loaded this object.
1267 Ignore requests to load multiple times */
1271 for (o = objects; o; o = o->next) {
1272 if (0 == strcmp(o->fileName, path)) {
1274 break; /* don't need to search further */
1278 IF_DEBUG(linker, debugBelch(
1279 "GHCi runtime linker: warning: looks like you're trying to load the\n"
1280 "same object file twice:\n"
1282 "GHCi will ignore this, but be warned.\n"
1284 return 1; /* success */
1288 oc = stgMallocBytes(sizeof(ObjectCode), "loadObj(oc)");
1290 # if defined(OBJFORMAT_ELF)
1291 oc->formatName = "ELF";
1292 # elif defined(OBJFORMAT_PEi386)
1293 oc->formatName = "PEi386";
1294 # elif defined(OBJFORMAT_MACHO)
1295 oc->formatName = "Mach-O";
1298 barf("loadObj: not implemented on this platform");
1301 r = stat(path, &st);
1302 if (r == -1) { return 0; }
1304 /* sigh, strdup() isn't a POSIX function, so do it the long way */
1305 oc->fileName = stgMallocBytes( strlen(path)+1, "loadObj" );
1306 strcpy(oc->fileName, path);
1308 oc->fileSize = st.st_size;
1310 oc->sections = NULL;
1311 oc->lochash = allocStrHashTable();
1312 oc->proddables = NULL;
1314 /* chain it onto the list of objects */
1319 #define ROUND_UP(x,size) ((x + size - 1) & ~(size - 1))
1321 /* On many architectures malloc'd memory isn't executable, so we need to use mmap. */
1323 #if defined(openbsd_HOST_OS)
1324 fd = open(path, O_RDONLY, S_IRUSR);
1326 fd = open(path, O_RDONLY);
1329 barf("loadObj: can't open `%s'", path);
1331 pagesize = getpagesize();
1333 #ifdef ia64_HOST_ARCH
1334 /* The PLT needs to be right before the object */
1335 n = ROUND_UP(PLTSize(), pagesize);
1336 oc->plt = mmap(NULL, n, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
1337 if (oc->plt == MAP_FAILED)
1338 barf("loadObj: can't allocate PLT");
1341 map_addr = oc->plt + n;
1344 n = ROUND_UP(oc->fileSize, pagesize);
1346 /* Link objects into the lower 2Gb on x86_64. GHC assumes the
1347 * small memory model on this architecture (see gcc docs,
1350 #ifdef x86_64_HOST_ARCH
1351 #define EXTRA_MAP_FLAGS MAP_32BIT
1353 #define EXTRA_MAP_FLAGS 0
1356 oc->image = mmap(map_addr, n, PROT_EXEC|PROT_READ|PROT_WRITE,
1357 MAP_PRIVATE|EXTRA_MAP_FLAGS, fd, 0);
1358 if (oc->image == MAP_FAILED)
1359 barf("loadObj: can't map `%s'", path);
1363 #else /* !USE_MMAP */
1365 /* load the image into memory */
1366 f = fopen(path, "rb");
1368 barf("loadObj: can't read `%s'", path);
1370 #ifdef darwin_HOST_OS
1371 // In a Mach-O .o file, all sections can and will be misaligned
1372 // if the total size of the headers is not a multiple of the
1373 // desired alignment. This is fine for .o files that only serve
1374 // as input for the static linker, but it's not fine for us,
1375 // as SSE (used by gcc for floating point) and Altivec require
1376 // 16-byte alignment.
1377 // We calculate the correct alignment from the header before
1378 // reading the file, and then we misalign oc->image on purpose so
1379 // that the actual sections end up aligned again.
1380 misalignment = machoGetMisalignment(f);
1381 oc->misalignment = misalignment;
1386 oc->image = stgMallocBytes(oc->fileSize + misalignment, "loadObj(image)");
1387 oc->image += misalignment;
1389 n = fread ( oc->image, 1, oc->fileSize, f );
1390 if (n != oc->fileSize)
1391 barf("loadObj: error whilst reading `%s'", path);
1395 #endif /* USE_MMAP */
1397 # if defined(OBJFORMAT_MACHO) && defined(powerpc_HOST_ARCH)
1398 r = ocAllocateJumpIslands_MachO ( oc );
1399 if (!r) { return r; }
1400 # elif defined(OBJFORMAT_ELF) && defined(powerpc_HOST_ARCH)
1401 r = ocAllocateJumpIslands_ELF ( oc );
1402 if (!r) { return r; }
1405 /* verify the in-memory image */
1406 # if defined(OBJFORMAT_ELF)
1407 r = ocVerifyImage_ELF ( oc );
1408 # elif defined(OBJFORMAT_PEi386)
1409 r = ocVerifyImage_PEi386 ( oc );
1410 # elif defined(OBJFORMAT_MACHO)
1411 r = ocVerifyImage_MachO ( oc );
1413 barf("loadObj: no verify method");
1415 if (!r) { return r; }
1417 /* build the symbol list for this image */
1418 # if defined(OBJFORMAT_ELF)
1419 r = ocGetNames_ELF ( oc );
1420 # elif defined(OBJFORMAT_PEi386)
1421 r = ocGetNames_PEi386 ( oc );
1422 # elif defined(OBJFORMAT_MACHO)
1423 r = ocGetNames_MachO ( oc );
1425 barf("loadObj: no getNames method");
1427 if (!r) { return r; }
1429 /* loaded, but not resolved yet */
1430 oc->status = OBJECT_LOADED;
1435 /* -----------------------------------------------------------------------------
1436 * resolve all the currently unlinked objects in memory
1438 * Returns: 1 if ok, 0 on error.
1448 for (oc = objects; oc; oc = oc->next) {
1449 if (oc->status != OBJECT_RESOLVED) {
1450 # if defined(OBJFORMAT_ELF)
1451 r = ocResolve_ELF ( oc );
1452 # elif defined(OBJFORMAT_PEi386)
1453 r = ocResolve_PEi386 ( oc );
1454 # elif defined(OBJFORMAT_MACHO)
1455 r = ocResolve_MachO ( oc );
1457 barf("resolveObjs: not implemented on this platform");
1459 if (!r) { return r; }
1460 oc->status = OBJECT_RESOLVED;
1466 /* -----------------------------------------------------------------------------
1467 * delete an object from the pool
1470 unloadObj( char *path )
1472 ObjectCode *oc, *prev;
1474 ASSERT(symhash != NULL);
1475 ASSERT(objects != NULL);
1480 for (oc = objects; oc; prev = oc, oc = oc->next) {
1481 if (!strcmp(oc->fileName,path)) {
1483 /* Remove all the mappings for the symbols within this
1488 for (i = 0; i < oc->n_symbols; i++) {
1489 if (oc->symbols[i] != NULL) {
1490 removeStrHashTable(symhash, oc->symbols[i], NULL);
1498 prev->next = oc->next;
1501 /* We're going to leave this in place, in case there are
1502 any pointers from the heap into it: */
1503 /* stgFree(oc->image); */
1504 stgFree(oc->fileName);
1505 stgFree(oc->symbols);
1506 stgFree(oc->sections);
1507 /* The local hash table should have been freed at the end
1508 of the ocResolve_ call on it. */
1509 ASSERT(oc->lochash == NULL);
1515 errorBelch("unloadObj: can't find `%s' to unload", path);
1519 /* -----------------------------------------------------------------------------
1520 * Sanity checking. For each ObjectCode, maintain a list of address ranges
1521 * which may be prodded during relocation, and abort if we try and write
1522 * outside any of these.
1524 static void addProddableBlock ( ObjectCode* oc, void* start, int size )
1527 = stgMallocBytes(sizeof(ProddableBlock), "addProddableBlock");
1528 /* debugBelch("aPB %p %p %d\n", oc, start, size); */
1532 pb->next = oc->proddables;
1533 oc->proddables = pb;
1536 static void checkProddableBlock ( ObjectCode* oc, void* addr )
1539 for (pb = oc->proddables; pb != NULL; pb = pb->next) {
1540 char* s = (char*)(pb->start);
1541 char* e = s + pb->size - 1;
1542 char* a = (char*)addr;
1543 /* Assumes that the biggest fixup involves a 4-byte write. This
1544 probably needs to be changed to 8 (ie, +7) on 64-bit
1546 if (a >= s && (a+3) <= e) return;
1548 barf("checkProddableBlock: invalid fixup in runtime linker");
1551 /* -----------------------------------------------------------------------------
1552 * Section management.
1554 static void addSection ( ObjectCode* oc, SectionKind kind,
1555 void* start, void* end )
1557 Section* s = stgMallocBytes(sizeof(Section), "addSection");
1561 s->next = oc->sections;
1564 debugBelch("addSection: %p-%p (size %d), kind %d\n",
1565 start, ((char*)end)-1, end - start + 1, kind );
1570 /* --------------------------------------------------------------------------
1571 * PowerPC specifics (jump islands)
1572 * ------------------------------------------------------------------------*/
1574 #if defined(powerpc_HOST_ARCH)
1577 ocAllocateJumpIslands
1579 Allocate additional space at the end of the object file image to make room
1582 PowerPC relative branch instructions have a 24 bit displacement field.
1583 As PPC code is always 4-byte-aligned, this yields a +-32MB range.
1584 If a particular imported symbol is outside this range, we have to redirect
1585 the jump to a short piece of new code that just loads the 32bit absolute
1586 address and jumps there.
1587 This function just allocates space for one 16 byte ppcJumpIsland for every
1588 undefined symbol in the object file. The code for the islands is filled in by
1589 makeJumpIsland below.
1592 static int ocAllocateJumpIslands( ObjectCode* oc, int count, int first )
1598 int misalignment = 0;
1600 misalignment = oc->misalignment;
1605 // round up to the nearest 4
1606 aligned = (oc->fileSize + 3) & ~3;
1609 #ifndef linux_HOST_OS /* mremap is a linux extension */
1610 #error ocAllocateJumpIslands doesnt want USE_MMAP to be defined
1613 pagesize = getpagesize();
1614 n = ROUND_UP( oc->fileSize, pagesize );
1615 m = ROUND_UP( aligned + sizeof (ppcJumpIsland) * count, pagesize );
1617 /* If we have a half-page-size file and map one page of it then
1618 * the part of the page after the size of the file remains accessible.
1619 * If, however, we map in 2 pages, the 2nd page is not accessible
1620 * and will give a "Bus Error" on access. To get around this, we check
1621 * if we need any extra pages for the jump islands and map them in
1622 * anonymously. We must check that we actually require extra pages
1623 * otherwise the attempt to mmap 0 pages of anonymous memory will
1629 /* The effect of this mremap() call is only the ensure that we have
1630 * a sufficient number of virtually contiguous pages. As returned from
1631 * mremap, the pages past the end of the file are not backed. We give
1632 * them a backing by using MAP_FIXED to map in anonymous pages.
1634 oc->image = mremap( oc->image, n, m, MREMAP_MAYMOVE );
1636 if( oc->image == MAP_FAILED )
1638 errorBelch( "Unable to mremap for Jump Islands\n" );
1642 if( mmap( oc->image + n, m - n, PROT_READ | PROT_WRITE | PROT_EXEC,
1643 MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED, 0, 0 ) == MAP_FAILED )
1645 errorBelch( "Unable to mmap( MAP_FIXED ) for Jump Islands\n" );
1651 oc->image -= misalignment;
1652 oc->image = stgReallocBytes( oc->image,
1654 aligned + sizeof (ppcJumpIsland) * count,
1655 "ocAllocateJumpIslands" );
1656 oc->image += misalignment;
1657 #endif /* USE_MMAP */
1659 oc->jump_islands = (ppcJumpIsland *) (oc->image + aligned);
1660 memset( oc->jump_islands, 0, sizeof (ppcJumpIsland) * count );
1663 oc->jump_islands = NULL;
1665 oc->island_start_symbol = first;
1666 oc->n_islands = count;
1671 static unsigned long makeJumpIsland( ObjectCode* oc,
1672 unsigned long symbolNumber,
1673 unsigned long target )
1675 ppcJumpIsland *island;
1677 if( symbolNumber < oc->island_start_symbol ||
1678 symbolNumber - oc->island_start_symbol > oc->n_islands)
1681 island = &oc->jump_islands[symbolNumber - oc->island_start_symbol];
1683 // lis r12, hi16(target)
1684 island->lis_r12 = 0x3d80;
1685 island->hi_addr = target >> 16;
1687 // ori r12, r12, lo16(target)
1688 island->ori_r12_r12 = 0x618c;
1689 island->lo_addr = target & 0xffff;
1692 island->mtctr_r12 = 0x7d8903a6;
1695 island->bctr = 0x4e800420;
1697 return (unsigned long) island;
1701 ocFlushInstructionCache
1703 Flush the data & instruction caches.
1704 Because the PPC has split data/instruction caches, we have to
1705 do that whenever we modify code at runtime.
1708 static void ocFlushInstructionCache( ObjectCode *oc )
1710 int n = (oc->fileSize + sizeof( ppcJumpIsland ) * oc->n_islands + 3) / 4;
1711 unsigned long *p = (unsigned long *) oc->image;
1715 __asm__ volatile ( "dcbf 0,%0\n\t"
1723 __asm__ volatile ( "sync\n\t"
1729 /* --------------------------------------------------------------------------
1730 * PEi386 specifics (Win32 targets)
1731 * ------------------------------------------------------------------------*/
1733 /* The information for this linker comes from
1734 Microsoft Portable Executable
1735 and Common Object File Format Specification
1736 revision 5.1 January 1998
1737 which SimonM says comes from the MS Developer Network CDs.
1739 It can be found there (on older CDs), but can also be found
1742 http://www.microsoft.com/hwdev/hardware/PECOFF.asp
1744 (this is Rev 6.0 from February 1999).
1746 Things move, so if that fails, try searching for it via
1748 http://www.google.com/search?q=PE+COFF+specification
1750 The ultimate reference for the PE format is the Winnt.h
1751 header file that comes with the Platform SDKs; as always,
1752 implementations will drift wrt their documentation.
1754 A good background article on the PE format is Matt Pietrek's
1755 March 1994 article in Microsoft System Journal (MSJ)
1756 (Vol.9, No. 3): "Peering Inside the PE: A Tour of the
1757 Win32 Portable Executable File Format." The info in there
1758 has recently been updated in a two part article in
1759 MSDN magazine, issues Feb and March 2002,
1760 "Inside Windows: An In-Depth Look into the Win32 Portable
1761 Executable File Format"
1763 John Levine's book "Linkers and Loaders" contains useful
1768 #if defined(OBJFORMAT_PEi386)
1772 typedef unsigned char UChar;
1773 typedef unsigned short UInt16;
1774 typedef unsigned int UInt32;
1781 UInt16 NumberOfSections;
1782 UInt32 TimeDateStamp;
1783 UInt32 PointerToSymbolTable;
1784 UInt32 NumberOfSymbols;
1785 UInt16 SizeOfOptionalHeader;
1786 UInt16 Characteristics;
1790 #define sizeof_COFF_header 20
1797 UInt32 VirtualAddress;
1798 UInt32 SizeOfRawData;
1799 UInt32 PointerToRawData;
1800 UInt32 PointerToRelocations;
1801 UInt32 PointerToLinenumbers;
1802 UInt16 NumberOfRelocations;
1803 UInt16 NumberOfLineNumbers;
1804 UInt32 Characteristics;
1808 #define sizeof_COFF_section 40
1815 UInt16 SectionNumber;
1818 UChar NumberOfAuxSymbols;
1822 #define sizeof_COFF_symbol 18
1827 UInt32 VirtualAddress;
1828 UInt32 SymbolTableIndex;
1833 #define sizeof_COFF_reloc 10
1836 /* From PE spec doc, section 3.3.2 */
1837 /* Note use of MYIMAGE_* since IMAGE_* are already defined in
1838 windows.h -- for the same purpose, but I want to know what I'm
1840 #define MYIMAGE_FILE_RELOCS_STRIPPED 0x0001
1841 #define MYIMAGE_FILE_EXECUTABLE_IMAGE 0x0002
1842 #define MYIMAGE_FILE_DLL 0x2000
1843 #define MYIMAGE_FILE_SYSTEM 0x1000
1844 #define MYIMAGE_FILE_BYTES_REVERSED_HI 0x8000
1845 #define MYIMAGE_FILE_BYTES_REVERSED_LO 0x0080
1846 #define MYIMAGE_FILE_32BIT_MACHINE 0x0100
1848 /* From PE spec doc, section 5.4.2 and 5.4.4 */
1849 #define MYIMAGE_SYM_CLASS_EXTERNAL 2
1850 #define MYIMAGE_SYM_CLASS_STATIC 3
1851 #define MYIMAGE_SYM_UNDEFINED 0
1853 /* From PE spec doc, section 4.1 */
1854 #define MYIMAGE_SCN_CNT_CODE 0x00000020
1855 #define MYIMAGE_SCN_CNT_INITIALIZED_DATA 0x00000040
1856 #define MYIMAGE_SCN_LNK_NRELOC_OVFL 0x01000000
1858 /* From PE spec doc, section 5.2.1 */
1859 #define MYIMAGE_REL_I386_DIR32 0x0006
1860 #define MYIMAGE_REL_I386_REL32 0x0014
1863 /* We use myindex to calculate array addresses, rather than
1864 simply doing the normal subscript thing. That's because
1865 some of the above structs have sizes which are not
1866 a whole number of words. GCC rounds their sizes up to a
1867 whole number of words, which means that the address calcs
1868 arising from using normal C indexing or pointer arithmetic
1869 are just plain wrong. Sigh.
1872 myindex ( int scale, void* base, int index )
1875 ((UChar*)base) + scale * index;
1880 printName ( UChar* name, UChar* strtab )
1882 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
1883 UInt32 strtab_offset = * (UInt32*)(name+4);
1884 debugBelch("%s", strtab + strtab_offset );
1887 for (i = 0; i < 8; i++) {
1888 if (name[i] == 0) break;
1889 debugBelch("%c", name[i] );
1896 copyName ( UChar* name, UChar* strtab, UChar* dst, int dstSize )
1898 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
1899 UInt32 strtab_offset = * (UInt32*)(name+4);
1900 strncpy ( dst, strtab+strtab_offset, dstSize );
1906 if (name[i] == 0) break;
1916 cstring_from_COFF_symbol_name ( UChar* name, UChar* strtab )
1919 /* If the string is longer than 8 bytes, look in the
1920 string table for it -- this will be correctly zero terminated.
1922 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
1923 UInt32 strtab_offset = * (UInt32*)(name+4);
1924 return ((UChar*)strtab) + strtab_offset;
1926 /* Otherwise, if shorter than 8 bytes, return the original,
1927 which by defn is correctly terminated.
1929 if (name[7]==0) return name;
1930 /* The annoying case: 8 bytes. Copy into a temporary
1931 (which is never freed ...)
1933 newstr = stgMallocBytes(9, "cstring_from_COFF_symbol_name");
1935 strncpy(newstr,name,8);
1941 /* Just compares the short names (first 8 chars) */
1942 static COFF_section *
1943 findPEi386SectionCalled ( ObjectCode* oc, char* name )
1947 = (COFF_header*)(oc->image);
1948 COFF_section* sectab
1950 ((UChar*)(oc->image))
1951 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
1953 for (i = 0; i < hdr->NumberOfSections; i++) {
1956 COFF_section* section_i
1958 myindex ( sizeof_COFF_section, sectab, i );
1959 n1 = (UChar*) &(section_i->Name);
1961 if (n1[0]==n2[0] && n1[1]==n2[1] && n1[2]==n2[2] &&
1962 n1[3]==n2[3] && n1[4]==n2[4] && n1[5]==n2[5] &&
1963 n1[6]==n2[6] && n1[7]==n2[7])
1972 zapTrailingAtSign ( UChar* sym )
1974 # define my_isdigit(c) ((c) >= '0' && (c) <= '9')
1976 if (sym[0] == 0) return;
1978 while (sym[i] != 0) i++;
1981 while (j > 0 && my_isdigit(sym[j])) j--;
1982 if (j > 0 && sym[j] == '@' && j != i) sym[j] = 0;
1988 ocVerifyImage_PEi386 ( ObjectCode* oc )
1993 COFF_section* sectab;
1994 COFF_symbol* symtab;
1996 /* debugBelch("\nLOADING %s\n", oc->fileName); */
1997 hdr = (COFF_header*)(oc->image);
1998 sectab = (COFF_section*) (
1999 ((UChar*)(oc->image))
2000 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2002 symtab = (COFF_symbol*) (
2003 ((UChar*)(oc->image))
2004 + hdr->PointerToSymbolTable
2006 strtab = ((UChar*)symtab)
2007 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
2009 if (hdr->Machine != 0x14c) {
2010 errorBelch("%s: Not x86 PEi386", oc->fileName);
2013 if (hdr->SizeOfOptionalHeader != 0) {
2014 errorBelch("%s: PEi386 with nonempty optional header", oc->fileName);
2017 if ( /* (hdr->Characteristics & MYIMAGE_FILE_RELOCS_STRIPPED) || */
2018 (hdr->Characteristics & MYIMAGE_FILE_EXECUTABLE_IMAGE) ||
2019 (hdr->Characteristics & MYIMAGE_FILE_DLL) ||
2020 (hdr->Characteristics & MYIMAGE_FILE_SYSTEM) ) {
2021 errorBelch("%s: Not a PEi386 object file", oc->fileName);
2024 if ( (hdr->Characteristics & MYIMAGE_FILE_BYTES_REVERSED_HI)
2025 /* || !(hdr->Characteristics & MYIMAGE_FILE_32BIT_MACHINE) */ ) {
2026 errorBelch("%s: Invalid PEi386 word size or endiannness: %d",
2028 (int)(hdr->Characteristics));
2031 /* If the string table size is way crazy, this might indicate that
2032 there are more than 64k relocations, despite claims to the
2033 contrary. Hence this test. */
2034 /* debugBelch("strtab size %d\n", * (UInt32*)strtab); */
2036 if ( (*(UInt32*)strtab) > 600000 ) {
2037 /* Note that 600k has no special significance other than being
2038 big enough to handle the almost-2MB-sized lumps that
2039 constitute HSwin32*.o. */
2040 debugBelch("PEi386 object has suspiciously large string table; > 64k relocs?");
2045 /* No further verification after this point; only debug printing. */
2047 IF_DEBUG(linker, i=1);
2048 if (i == 0) return 1;
2050 debugBelch( "sectab offset = %d\n", ((UChar*)sectab) - ((UChar*)hdr) );
2051 debugBelch( "symtab offset = %d\n", ((UChar*)symtab) - ((UChar*)hdr) );
2052 debugBelch( "strtab offset = %d\n", ((UChar*)strtab) - ((UChar*)hdr) );
2055 debugBelch( "Machine: 0x%x\n", (UInt32)(hdr->Machine) );
2056 debugBelch( "# sections: %d\n", (UInt32)(hdr->NumberOfSections) );
2057 debugBelch( "time/date: 0x%x\n", (UInt32)(hdr->TimeDateStamp) );
2058 debugBelch( "symtab offset: %d\n", (UInt32)(hdr->PointerToSymbolTable) );
2059 debugBelch( "# symbols: %d\n", (UInt32)(hdr->NumberOfSymbols) );
2060 debugBelch( "sz of opt hdr: %d\n", (UInt32)(hdr->SizeOfOptionalHeader) );
2061 debugBelch( "characteristics: 0x%x\n", (UInt32)(hdr->Characteristics) );
2063 /* Print the section table. */
2065 for (i = 0; i < hdr->NumberOfSections; i++) {
2067 COFF_section* sectab_i
2069 myindex ( sizeof_COFF_section, sectab, i );
2076 printName ( sectab_i->Name, strtab );
2086 sectab_i->VirtualSize,
2087 sectab_i->VirtualAddress,
2088 sectab_i->SizeOfRawData,
2089 sectab_i->PointerToRawData,
2090 sectab_i->NumberOfRelocations,
2091 sectab_i->PointerToRelocations,
2092 sectab_i->PointerToRawData
2094 reltab = (COFF_reloc*) (
2095 ((UChar*)(oc->image)) + sectab_i->PointerToRelocations
2098 if ( sectab_i->Characteristics & MYIMAGE_SCN_LNK_NRELOC_OVFL ) {
2099 /* If the relocation field (a short) has overflowed, the
2100 * real count can be found in the first reloc entry.
2102 * See Section 4.1 (last para) of the PE spec (rev6.0).
2104 COFF_reloc* rel = (COFF_reloc*)
2105 myindex ( sizeof_COFF_reloc, reltab, 0 );
2106 noRelocs = rel->VirtualAddress;
2109 noRelocs = sectab_i->NumberOfRelocations;
2113 for (; j < noRelocs; j++) {
2115 COFF_reloc* rel = (COFF_reloc*)
2116 myindex ( sizeof_COFF_reloc, reltab, j );
2118 " type 0x%-4x vaddr 0x%-8x name `",
2120 rel->VirtualAddress );
2121 sym = (COFF_symbol*)
2122 myindex ( sizeof_COFF_symbol, symtab, rel->SymbolTableIndex );
2123 /* Hmm..mysterious looking offset - what's it for? SOF */
2124 printName ( sym->Name, strtab -10 );
2131 debugBelch("string table has size 0x%x\n", * (UInt32*)strtab );
2132 debugBelch("---START of string table---\n");
2133 for (i = 4; i < *(Int32*)strtab; i++) {
2135 debugBelch("\n"); else
2136 debugBelch("%c", strtab[i] );
2138 debugBelch("--- END of string table---\n");
2143 COFF_symbol* symtab_i;
2144 if (i >= (Int32)(hdr->NumberOfSymbols)) break;
2145 symtab_i = (COFF_symbol*)
2146 myindex ( sizeof_COFF_symbol, symtab, i );
2152 printName ( symtab_i->Name, strtab );
2161 (Int32)(symtab_i->SectionNumber),
2162 (UInt32)symtab_i->Type,
2163 (UInt32)symtab_i->StorageClass,
2164 (UInt32)symtab_i->NumberOfAuxSymbols
2166 i += symtab_i->NumberOfAuxSymbols;
2176 ocGetNames_PEi386 ( ObjectCode* oc )
2179 COFF_section* sectab;
2180 COFF_symbol* symtab;
2187 hdr = (COFF_header*)(oc->image);
2188 sectab = (COFF_section*) (
2189 ((UChar*)(oc->image))
2190 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2192 symtab = (COFF_symbol*) (
2193 ((UChar*)(oc->image))
2194 + hdr->PointerToSymbolTable
2196 strtab = ((UChar*)(oc->image))
2197 + hdr->PointerToSymbolTable
2198 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
2200 /* Allocate space for any (local, anonymous) .bss sections. */
2202 for (i = 0; i < hdr->NumberOfSections; i++) {
2205 COFF_section* sectab_i
2207 myindex ( sizeof_COFF_section, sectab, i );
2208 if (0 != strcmp(sectab_i->Name, ".bss")) continue;
2209 /* sof 10/05: the PE spec text isn't too clear regarding what
2210 * the SizeOfRawData field is supposed to hold for object
2211 * file sections containing just uninitialized data -- for executables,
2212 * it is supposed to be zero; unclear what it's supposed to be
2213 * for object files. However, VirtualSize is guaranteed to be
2214 * zero for object files, which definitely suggests that SizeOfRawData
2215 * will be non-zero (where else would the size of this .bss section be
2216 * stored?) Looking at the COFF_section info for incoming object files,
2217 * this certainly appears to be the case.
2219 * => I suspect we've been incorrectly handling .bss sections in (relocatable)
2220 * object files up until now. This turned out to bite us with ghc-6.4.1's use
2221 * of gcc-3.4.x, which has started to emit initially-zeroed-out local 'static'
2222 * variable decls into to the .bss section. (The specific function in Q which
2223 * triggered this is libraries/base/cbits/dirUtils.c:__hscore_getFolderPath())
2225 if (sectab_i->VirtualSize == 0 && sectab_i->SizeOfRawData == 0) continue;
2226 /* This is a non-empty .bss section. Allocate zeroed space for
2227 it, and set its PointerToRawData field such that oc->image +
2228 PointerToRawData == addr_of_zeroed_space. */
2229 bss_sz = sectab_i->VirtualSize;
2230 if ( bss_sz < sectab_i->SizeOfRawData) { bss_sz = sectab_i->SizeOfRawData; }
2231 zspace = stgCallocBytes(1, bss_sz, "ocGetNames_PEi386(anonymous bss)");
2232 sectab_i->PointerToRawData = ((UChar*)zspace) - ((UChar*)(oc->image));
2233 addProddableBlock(oc, zspace, bss_sz);
2234 /* debugBelch("BSS anon section at 0x%x\n", zspace); */
2237 /* Copy section information into the ObjectCode. */
2239 for (i = 0; i < hdr->NumberOfSections; i++) {
2245 = SECTIONKIND_OTHER;
2246 COFF_section* sectab_i
2248 myindex ( sizeof_COFF_section, sectab, i );
2249 IF_DEBUG(linker, debugBelch("section name = %s\n", sectab_i->Name ));
2252 /* I'm sure this is the Right Way to do it. However, the
2253 alternative of testing the sectab_i->Name field seems to
2254 work ok with Cygwin.
2256 if (sectab_i->Characteristics & MYIMAGE_SCN_CNT_CODE ||
2257 sectab_i->Characteristics & MYIMAGE_SCN_CNT_INITIALIZED_DATA)
2258 kind = SECTIONKIND_CODE_OR_RODATA;
2261 if (0==strcmp(".text",sectab_i->Name) ||
2262 0==strcmp(".rdata",sectab_i->Name)||
2263 0==strcmp(".rodata",sectab_i->Name))
2264 kind = SECTIONKIND_CODE_OR_RODATA;
2265 if (0==strcmp(".data",sectab_i->Name) ||
2266 0==strcmp(".bss",sectab_i->Name))
2267 kind = SECTIONKIND_RWDATA;
2269 ASSERT(sectab_i->SizeOfRawData == 0 || sectab_i->VirtualSize == 0);
2270 sz = sectab_i->SizeOfRawData;
2271 if (sz < sectab_i->VirtualSize) sz = sectab_i->VirtualSize;
2273 start = ((UChar*)(oc->image)) + sectab_i->PointerToRawData;
2274 end = start + sz - 1;
2276 if (kind == SECTIONKIND_OTHER
2277 /* Ignore sections called which contain stabs debugging
2279 && 0 != strcmp(".stab", sectab_i->Name)
2280 && 0 != strcmp(".stabstr", sectab_i->Name)
2281 /* ignore constructor section for now */
2282 && 0 != strcmp(".ctors", sectab_i->Name)
2284 errorBelch("Unknown PEi386 section name `%s' (while processing: %s)", sectab_i->Name, oc->fileName);
2288 if (kind != SECTIONKIND_OTHER && end >= start) {
2289 addSection(oc, kind, start, end);
2290 addProddableBlock(oc, start, end - start + 1);
2294 /* Copy exported symbols into the ObjectCode. */
2296 oc->n_symbols = hdr->NumberOfSymbols;
2297 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
2298 "ocGetNames_PEi386(oc->symbols)");
2299 /* Call me paranoid; I don't care. */
2300 for (i = 0; i < oc->n_symbols; i++)
2301 oc->symbols[i] = NULL;
2305 COFF_symbol* symtab_i;
2306 if (i >= (Int32)(hdr->NumberOfSymbols)) break;
2307 symtab_i = (COFF_symbol*)
2308 myindex ( sizeof_COFF_symbol, symtab, i );
2312 if (symtab_i->StorageClass == MYIMAGE_SYM_CLASS_EXTERNAL
2313 && symtab_i->SectionNumber != MYIMAGE_SYM_UNDEFINED) {
2314 /* This symbol is global and defined, viz, exported */
2315 /* for MYIMAGE_SYMCLASS_EXTERNAL
2316 && !MYIMAGE_SYM_UNDEFINED,
2317 the address of the symbol is:
2318 address of relevant section + offset in section
2320 COFF_section* sectabent
2321 = (COFF_section*) myindex ( sizeof_COFF_section,
2323 symtab_i->SectionNumber-1 );
2324 addr = ((UChar*)(oc->image))
2325 + (sectabent->PointerToRawData
2329 if (symtab_i->SectionNumber == MYIMAGE_SYM_UNDEFINED
2330 && symtab_i->Value > 0) {
2331 /* This symbol isn't in any section at all, ie, global bss.
2332 Allocate zeroed space for it. */
2333 addr = stgCallocBytes(1, symtab_i->Value,
2334 "ocGetNames_PEi386(non-anonymous bss)");
2335 addSection(oc, SECTIONKIND_RWDATA, addr,
2336 ((UChar*)addr) + symtab_i->Value - 1);
2337 addProddableBlock(oc, addr, symtab_i->Value);
2338 /* debugBelch("BSS section at 0x%x\n", addr); */
2341 if (addr != NULL ) {
2342 sname = cstring_from_COFF_symbol_name ( symtab_i->Name, strtab );
2343 /* debugBelch("addSymbol %p `%s \n", addr,sname); */
2344 IF_DEBUG(linker, debugBelch("addSymbol %p `%s'\n", addr,sname);)
2345 ASSERT(i >= 0 && i < oc->n_symbols);
2346 /* cstring_from_COFF_symbol_name always succeeds. */
2347 oc->symbols[i] = sname;
2348 ghciInsertStrHashTable(oc->fileName, symhash, sname, addr);
2352 "IGNORING symbol %d\n"
2356 printName ( symtab_i->Name, strtab );
2365 (Int32)(symtab_i->SectionNumber),
2366 (UInt32)symtab_i->Type,
2367 (UInt32)symtab_i->StorageClass,
2368 (UInt32)symtab_i->NumberOfAuxSymbols
2373 i += symtab_i->NumberOfAuxSymbols;
2382 ocResolve_PEi386 ( ObjectCode* oc )
2385 COFF_section* sectab;
2386 COFF_symbol* symtab;
2396 /* ToDo: should be variable-sized? But is at least safe in the
2397 sense of buffer-overrun-proof. */
2399 /* debugBelch("resolving for %s\n", oc->fileName); */
2401 hdr = (COFF_header*)(oc->image);
2402 sectab = (COFF_section*) (
2403 ((UChar*)(oc->image))
2404 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2406 symtab = (COFF_symbol*) (
2407 ((UChar*)(oc->image))
2408 + hdr->PointerToSymbolTable
2410 strtab = ((UChar*)(oc->image))
2411 + hdr->PointerToSymbolTable
2412 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
2414 for (i = 0; i < hdr->NumberOfSections; i++) {
2415 COFF_section* sectab_i
2417 myindex ( sizeof_COFF_section, sectab, i );
2420 ((UChar*)(oc->image)) + sectab_i->PointerToRelocations
2423 /* Ignore sections called which contain stabs debugging
2425 if (0 == strcmp(".stab", sectab_i->Name)
2426 || 0 == strcmp(".stabstr", sectab_i->Name)
2427 || 0 == strcmp(".ctors", sectab_i->Name))
2430 if ( sectab_i->Characteristics & MYIMAGE_SCN_LNK_NRELOC_OVFL ) {
2431 /* If the relocation field (a short) has overflowed, the
2432 * real count can be found in the first reloc entry.
2434 * See Section 4.1 (last para) of the PE spec (rev6.0).
2436 * Nov2003 update: the GNU linker still doesn't correctly
2437 * handle the generation of relocatable object files with
2438 * overflown relocations. Hence the output to warn of potential
2441 COFF_reloc* rel = (COFF_reloc*)
2442 myindex ( sizeof_COFF_reloc, reltab, 0 );
2443 noRelocs = rel->VirtualAddress;
2445 /* 10/05: we now assume (and check for) a GNU ld that is capable
2446 * of handling object files with (>2^16) of relocs.
2449 debugBelch("WARNING: Overflown relocation field (# relocs found: %u)\n",
2454 noRelocs = sectab_i->NumberOfRelocations;
2459 for (; j < noRelocs; j++) {
2461 COFF_reloc* reltab_j
2463 myindex ( sizeof_COFF_reloc, reltab, j );
2465 /* the location to patch */
2467 ((UChar*)(oc->image))
2468 + (sectab_i->PointerToRawData
2469 + reltab_j->VirtualAddress
2470 - sectab_i->VirtualAddress )
2472 /* the existing contents of pP */
2474 /* the symbol to connect to */
2475 sym = (COFF_symbol*)
2476 myindex ( sizeof_COFF_symbol,
2477 symtab, reltab_j->SymbolTableIndex );
2480 "reloc sec %2d num %3d: type 0x%-4x "
2481 "vaddr 0x%-8x name `",
2483 (UInt32)reltab_j->Type,
2484 reltab_j->VirtualAddress );
2485 printName ( sym->Name, strtab );
2486 debugBelch("'\n" ));
2488 if (sym->StorageClass == MYIMAGE_SYM_CLASS_STATIC) {
2489 COFF_section* section_sym
2490 = findPEi386SectionCalled ( oc, sym->Name );
2492 errorBelch("%s: can't find section `%s'", oc->fileName, sym->Name);
2495 S = ((UInt32)(oc->image))
2496 + (section_sym->PointerToRawData
2499 copyName ( sym->Name, strtab, symbol, 1000-1 );
2500 (void*)S = lookupLocalSymbol( oc, symbol );
2501 if ((void*)S != NULL) goto foundit;
2502 (void*)S = lookupSymbol( symbol );
2503 if ((void*)S != NULL) goto foundit;
2504 zapTrailingAtSign ( symbol );
2505 (void*)S = lookupLocalSymbol( oc, symbol );
2506 if ((void*)S != NULL) goto foundit;
2507 (void*)S = lookupSymbol( symbol );
2508 if ((void*)S != NULL) goto foundit;
2509 /* Newline first because the interactive linker has printed "linking..." */
2510 errorBelch("\n%s: unknown symbol `%s'", oc->fileName, symbol);
2514 checkProddableBlock(oc, pP);
2515 switch (reltab_j->Type) {
2516 case MYIMAGE_REL_I386_DIR32:
2519 case MYIMAGE_REL_I386_REL32:
2520 /* Tricky. We have to insert a displacement at
2521 pP which, when added to the PC for the _next_
2522 insn, gives the address of the target (S).
2523 Problem is to know the address of the next insn
2524 when we only know pP. We assume that this
2525 literal field is always the last in the insn,
2526 so that the address of the next insn is pP+4
2527 -- hence the constant 4.
2528 Also I don't know if A should be added, but so
2529 far it has always been zero.
2531 SOF 05/2005: 'A' (old contents of *pP) have been observed
2532 to contain values other than zero (the 'wx' object file
2533 that came with wxhaskell-0.9.4; dunno how it was compiled..).
2534 So, add displacement to old value instead of asserting
2535 A to be zero. Fixes wxhaskell-related crashes, and no other
2536 ill effects have been observed.
2538 Update: the reason why we're seeing these more elaborate
2539 relocations is due to a switch in how the NCG compiles SRTs
2540 and offsets to them from info tables. SRTs live in .(ro)data,
2541 while info tables live in .text, causing GAS to emit REL32/DISP32
2542 relocations with non-zero values. Adding the displacement is
2543 the right thing to do.
2545 *pP = S - ((UInt32)pP) - 4 + A;
2548 debugBelch("%s: unhandled PEi386 relocation type %d",
2549 oc->fileName, reltab_j->Type);
2556 IF_DEBUG(linker, debugBelch("completed %s", oc->fileName));
2560 #endif /* defined(OBJFORMAT_PEi386) */
2563 /* --------------------------------------------------------------------------
2565 * ------------------------------------------------------------------------*/
2567 #if defined(OBJFORMAT_ELF)
2572 #if defined(sparc_HOST_ARCH)
2573 # define ELF_TARGET_SPARC /* Used inside <elf.h> */
2574 #elif defined(i386_HOST_ARCH)
2575 # define ELF_TARGET_386 /* Used inside <elf.h> */
2576 #elif defined(x86_64_HOST_ARCH)
2577 # define ELF_TARGET_X64_64
2579 #elif defined (ia64_HOST_ARCH)
2580 # define ELF_TARGET_IA64 /* Used inside <elf.h> */
2582 # define ELF_FUNCTION_DESC /* calling convention uses function descriptors */
2583 # define ELF_NEED_GOT /* needs Global Offset Table */
2584 # define ELF_NEED_PLT /* needs Procedure Linkage Tables */
2587 #if !defined(openbsd_HOST_OS)
2590 /* openbsd elf has things in different places, with diff names */
2591 #include <elf_abi.h>
2592 #include <machine/reloc.h>
2593 #define R_386_32 RELOC_32
2594 #define R_386_PC32 RELOC_PC32
2598 * Define a set of types which can be used for both ELF32 and ELF64
2602 #define ELFCLASS ELFCLASS64
2603 #define Elf_Addr Elf64_Addr
2604 #define Elf_Word Elf64_Word
2605 #define Elf_Sword Elf64_Sword
2606 #define Elf_Ehdr Elf64_Ehdr
2607 #define Elf_Phdr Elf64_Phdr
2608 #define Elf_Shdr Elf64_Shdr
2609 #define Elf_Sym Elf64_Sym
2610 #define Elf_Rel Elf64_Rel
2611 #define Elf_Rela Elf64_Rela
2612 #define ELF_ST_TYPE ELF64_ST_TYPE
2613 #define ELF_ST_BIND ELF64_ST_BIND
2614 #define ELF_R_TYPE ELF64_R_TYPE
2615 #define ELF_R_SYM ELF64_R_SYM
2617 #define ELFCLASS ELFCLASS32
2618 #define Elf_Addr Elf32_Addr
2619 #define Elf_Word Elf32_Word
2620 #define Elf_Sword Elf32_Sword
2621 #define Elf_Ehdr Elf32_Ehdr
2622 #define Elf_Phdr Elf32_Phdr
2623 #define Elf_Shdr Elf32_Shdr
2624 #define Elf_Sym Elf32_Sym
2625 #define Elf_Rel Elf32_Rel
2626 #define Elf_Rela Elf32_Rela
2628 #define ELF_ST_TYPE ELF32_ST_TYPE
2631 #define ELF_ST_BIND ELF32_ST_BIND
2634 #define ELF_R_TYPE ELF32_R_TYPE
2637 #define ELF_R_SYM ELF32_R_SYM
2643 * Functions to allocate entries in dynamic sections. Currently we simply
2644 * preallocate a large number, and we don't check if a entry for the given
2645 * target already exists (a linear search is too slow). Ideally these
2646 * entries would be associated with symbols.
2649 /* These sizes sufficient to load HSbase + HShaskell98 + a few modules */
2650 #define GOT_SIZE 0x20000
2651 #define FUNCTION_TABLE_SIZE 0x10000
2652 #define PLT_SIZE 0x08000
2655 static Elf_Addr got[GOT_SIZE];
2656 static unsigned int gotIndex;
2657 static Elf_Addr gp_val = (Elf_Addr)got;
2660 allocateGOTEntry(Elf_Addr target)
2664 if (gotIndex >= GOT_SIZE)
2665 barf("Global offset table overflow");
2667 entry = &got[gotIndex++];
2669 return (Elf_Addr)entry;
2673 #ifdef ELF_FUNCTION_DESC
2679 static FunctionDesc functionTable[FUNCTION_TABLE_SIZE];
2680 static unsigned int functionTableIndex;
2683 allocateFunctionDesc(Elf_Addr target)
2685 FunctionDesc *entry;
2687 if (functionTableIndex >= FUNCTION_TABLE_SIZE)
2688 barf("Function table overflow");
2690 entry = &functionTable[functionTableIndex++];
2692 entry->gp = (Elf_Addr)gp_val;
2693 return (Elf_Addr)entry;
2697 copyFunctionDesc(Elf_Addr target)
2699 FunctionDesc *olddesc = (FunctionDesc *)target;
2700 FunctionDesc *newdesc;
2702 newdesc = (FunctionDesc *)allocateFunctionDesc(olddesc->ip);
2703 newdesc->gp = olddesc->gp;
2704 return (Elf_Addr)newdesc;
2709 #ifdef ia64_HOST_ARCH
2710 static void ia64_reloc_gprel22(Elf_Addr target, Elf_Addr value);
2711 static void ia64_reloc_pcrel21(Elf_Addr target, Elf_Addr value, ObjectCode *oc);
2713 static unsigned char plt_code[] =
2715 /* taken from binutils bfd/elfxx-ia64.c */
2716 0x0b, 0x78, 0x00, 0x02, 0x00, 0x24, /* [MMI] addl r15=0,r1;; */
2717 0x00, 0x41, 0x3c, 0x30, 0x28, 0xc0, /* ld8 r16=[r15],8 */
2718 0x01, 0x08, 0x00, 0x84, /* mov r14=r1;; */
2719 0x11, 0x08, 0x00, 0x1e, 0x18, 0x10, /* [MIB] ld8 r1=[r15] */
2720 0x60, 0x80, 0x04, 0x80, 0x03, 0x00, /* mov b6=r16 */
2721 0x60, 0x00, 0x80, 0x00 /* br.few b6;; */
2724 /* If we can't get to the function descriptor via gp, take a local copy of it */
2725 #define PLT_RELOC(code, target) { \
2726 Elf64_Sxword rel_value = target - gp_val; \
2727 if ((rel_value > 0x1fffff) || (rel_value < -0x1fffff)) \
2728 ia64_reloc_gprel22((Elf_Addr)code, copyFunctionDesc(target)); \
2730 ia64_reloc_gprel22((Elf_Addr)code, target); \
2735 unsigned char code[sizeof(plt_code)];
2739 allocatePLTEntry(Elf_Addr target, ObjectCode *oc)
2741 PLTEntry *plt = (PLTEntry *)oc->plt;
2744 if (oc->pltIndex >= PLT_SIZE)
2745 barf("Procedure table overflow");
2747 entry = &plt[oc->pltIndex++];
2748 memcpy(entry->code, plt_code, sizeof(entry->code));
2749 PLT_RELOC(entry->code, target);
2750 return (Elf_Addr)entry;
2756 return (PLT_SIZE * sizeof(PLTEntry));
2761 #if x86_64_HOST_ARCH
2762 // On x86_64, 32-bit relocations are often used, which requires that
2763 // we can resolve a symbol to a 32-bit offset. However, shared
2764 // libraries are placed outside the 2Gb area, which leaves us with a
2765 // problem when we need to give a 32-bit offset to a symbol in a
2768 // For a function symbol, we can allocate a bounce sequence inside the
2769 // 2Gb area and resolve the symbol to this. The bounce sequence is
2770 // simply a long jump instruction to the real location of the symbol.
2772 // For data references, we're screwed.
2775 unsigned char jmp[8]; /* 6 byte instruction: jmpq *0x00000002(%rip) */
2779 #define X86_64_BB_SIZE 1024
2781 static x86_64_bounce *x86_64_bounce_buffer = NULL;
2782 static nat x86_64_bb_next_off;
2785 x86_64_high_symbol( char *lbl, void *addr )
2787 x86_64_bounce *bounce;
2789 if ( x86_64_bounce_buffer == NULL ||
2790 x86_64_bb_next_off >= X86_64_BB_SIZE ) {
2791 x86_64_bounce_buffer =
2792 mmap(NULL, X86_64_BB_SIZE * sizeof(x86_64_bounce),
2793 PROT_EXEC|PROT_READ|PROT_WRITE,
2794 MAP_PRIVATE|MAP_32BIT|MAP_ANONYMOUS, -1, 0);
2795 if (x86_64_bounce_buffer == MAP_FAILED) {
2796 barf("x86_64_high_symbol: mmap failed");
2798 x86_64_bb_next_off = 0;
2800 bounce = &x86_64_bounce_buffer[x86_64_bb_next_off];
2801 bounce->jmp[0] = 0xff;
2802 bounce->jmp[1] = 0x25;
2803 bounce->jmp[2] = 0x02;
2804 bounce->jmp[3] = 0x00;
2805 bounce->jmp[4] = 0x00;
2806 bounce->jmp[5] = 0x00;
2807 bounce->addr = addr;
2808 x86_64_bb_next_off++;
2810 IF_DEBUG(linker, debugBelch("x86_64: allocated bounce entry for %s->%p at %p\n",
2811 lbl, addr, bounce));
2813 insertStrHashTable(symhash, lbl, bounce);
2820 * Generic ELF functions
2824 findElfSection ( void* objImage, Elf_Word sh_type )
2826 char* ehdrC = (char*)objImage;
2827 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2828 Elf_Shdr* shdr = (Elf_Shdr*)(ehdrC + ehdr->e_shoff);
2829 char* sh_strtab = ehdrC + shdr[ehdr->e_shstrndx].sh_offset;
2833 for (i = 0; i < ehdr->e_shnum; i++) {
2834 if (shdr[i].sh_type == sh_type
2835 /* Ignore the section header's string table. */
2836 && i != ehdr->e_shstrndx
2837 /* Ignore string tables named .stabstr, as they contain
2839 && 0 != memcmp(".stabstr", sh_strtab + shdr[i].sh_name, 8)
2841 ptr = ehdrC + shdr[i].sh_offset;
2848 #if defined(ia64_HOST_ARCH)
2850 findElfSegment ( void* objImage, Elf_Addr vaddr )
2852 char* ehdrC = (char*)objImage;
2853 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2854 Elf_Phdr* phdr = (Elf_Phdr*)(ehdrC + ehdr->e_phoff);
2855 Elf_Addr segaddr = 0;
2858 for (i = 0; i < ehdr->e_phnum; i++) {
2859 segaddr = phdr[i].p_vaddr;
2860 if ((vaddr >= segaddr) && (vaddr < segaddr + phdr[i].p_memsz))
2868 ocVerifyImage_ELF ( ObjectCode* oc )
2872 int i, j, nent, nstrtab, nsymtabs;
2876 char* ehdrC = (char*)(oc->image);
2877 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2879 if (ehdr->e_ident[EI_MAG0] != ELFMAG0 ||
2880 ehdr->e_ident[EI_MAG1] != ELFMAG1 ||
2881 ehdr->e_ident[EI_MAG2] != ELFMAG2 ||
2882 ehdr->e_ident[EI_MAG3] != ELFMAG3) {
2883 errorBelch("%s: not an ELF object", oc->fileName);
2887 if (ehdr->e_ident[EI_CLASS] != ELFCLASS) {
2888 errorBelch("%s: unsupported ELF format", oc->fileName);
2892 if (ehdr->e_ident[EI_DATA] == ELFDATA2LSB) {
2893 IF_DEBUG(linker,debugBelch( "Is little-endian\n" ));
2895 if (ehdr->e_ident[EI_DATA] == ELFDATA2MSB) {
2896 IF_DEBUG(linker,debugBelch( "Is big-endian\n" ));
2898 errorBelch("%s: unknown endiannness", oc->fileName);
2902 if (ehdr->e_type != ET_REL) {
2903 errorBelch("%s: not a relocatable object (.o) file", oc->fileName);
2906 IF_DEBUG(linker, debugBelch( "Is a relocatable object (.o) file\n" ));
2908 IF_DEBUG(linker,debugBelch( "Architecture is " ));
2909 switch (ehdr->e_machine) {
2910 case EM_386: IF_DEBUG(linker,debugBelch( "x86" )); break;
2911 case EM_SPARC: IF_DEBUG(linker,debugBelch( "sparc" )); break;
2913 case EM_IA_64: IF_DEBUG(linker,debugBelch( "ia64" )); break;
2915 case EM_PPC: IF_DEBUG(linker,debugBelch( "powerpc32" )); break;
2917 case EM_X86_64: IF_DEBUG(linker,debugBelch( "x86_64" )); break;
2919 default: IF_DEBUG(linker,debugBelch( "unknown" ));
2920 errorBelch("%s: unknown architecture", oc->fileName);
2924 IF_DEBUG(linker,debugBelch(
2925 "\nSection header table: start %ld, n_entries %d, ent_size %d\n",
2926 (long)ehdr->e_shoff, ehdr->e_shnum, ehdr->e_shentsize ));
2928 ASSERT (ehdr->e_shentsize == sizeof(Elf_Shdr));
2930 shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
2932 if (ehdr->e_shstrndx == SHN_UNDEF) {
2933 errorBelch("%s: no section header string table", oc->fileName);
2936 IF_DEBUG(linker,debugBelch( "Section header string table is section %d\n",
2938 sh_strtab = ehdrC + shdr[ehdr->e_shstrndx].sh_offset;
2941 for (i = 0; i < ehdr->e_shnum; i++) {
2942 IF_DEBUG(linker,debugBelch("%2d: ", i ));
2943 IF_DEBUG(linker,debugBelch("type=%2d ", (int)shdr[i].sh_type ));
2944 IF_DEBUG(linker,debugBelch("size=%4d ", (int)shdr[i].sh_size ));
2945 IF_DEBUG(linker,debugBelch("offs=%4d ", (int)shdr[i].sh_offset ));
2946 IF_DEBUG(linker,debugBelch(" (%p .. %p) ",
2947 ehdrC + shdr[i].sh_offset,
2948 ehdrC + shdr[i].sh_offset + shdr[i].sh_size - 1));
2950 if (shdr[i].sh_type == SHT_REL) {
2951 IF_DEBUG(linker,debugBelch("Rel " ));
2952 } else if (shdr[i].sh_type == SHT_RELA) {
2953 IF_DEBUG(linker,debugBelch("RelA " ));
2955 IF_DEBUG(linker,debugBelch(" "));
2958 IF_DEBUG(linker,debugBelch("sname=%s\n", sh_strtab + shdr[i].sh_name ));
2962 IF_DEBUG(linker,debugBelch( "\nString tables" ));
2965 for (i = 0; i < ehdr->e_shnum; i++) {
2966 if (shdr[i].sh_type == SHT_STRTAB
2967 /* Ignore the section header's string table. */
2968 && i != ehdr->e_shstrndx
2969 /* Ignore string tables named .stabstr, as they contain
2971 && 0 != memcmp(".stabstr", sh_strtab + shdr[i].sh_name, 8)
2973 IF_DEBUG(linker,debugBelch(" section %d is a normal string table", i ));
2974 strtab = ehdrC + shdr[i].sh_offset;
2979 errorBelch("%s: no string tables, or too many", oc->fileName);
2984 IF_DEBUG(linker,debugBelch( "\nSymbol tables" ));
2985 for (i = 0; i < ehdr->e_shnum; i++) {
2986 if (shdr[i].sh_type != SHT_SYMTAB) continue;
2987 IF_DEBUG(linker,debugBelch( "section %d is a symbol table\n", i ));
2989 stab = (Elf_Sym*) (ehdrC + shdr[i].sh_offset);
2990 nent = shdr[i].sh_size / sizeof(Elf_Sym);
2991 IF_DEBUG(linker,debugBelch( " number of entries is apparently %d (%ld rem)\n",
2993 (long)shdr[i].sh_size % sizeof(Elf_Sym)
2995 if (0 != shdr[i].sh_size % sizeof(Elf_Sym)) {
2996 errorBelch("%s: non-integral number of symbol table entries", oc->fileName);
2999 for (j = 0; j < nent; j++) {
3000 IF_DEBUG(linker,debugBelch(" %2d ", j ));
3001 IF_DEBUG(linker,debugBelch(" sec=%-5d size=%-3d val=%5p ",
3002 (int)stab[j].st_shndx,
3003 (int)stab[j].st_size,
3004 (char*)stab[j].st_value ));
3006 IF_DEBUG(linker,debugBelch("type=" ));
3007 switch (ELF_ST_TYPE(stab[j].st_info)) {
3008 case STT_NOTYPE: IF_DEBUG(linker,debugBelch("notype " )); break;
3009 case STT_OBJECT: IF_DEBUG(linker,debugBelch("object " )); break;
3010 case STT_FUNC : IF_DEBUG(linker,debugBelch("func " )); break;
3011 case STT_SECTION: IF_DEBUG(linker,debugBelch("section" )); break;
3012 case STT_FILE: IF_DEBUG(linker,debugBelch("file " )); break;
3013 default: IF_DEBUG(linker,debugBelch("? " )); break;
3015 IF_DEBUG(linker,debugBelch(" " ));
3017 IF_DEBUG(linker,debugBelch("bind=" ));
3018 switch (ELF_ST_BIND(stab[j].st_info)) {
3019 case STB_LOCAL : IF_DEBUG(linker,debugBelch("local " )); break;
3020 case STB_GLOBAL: IF_DEBUG(linker,debugBelch("global" )); break;
3021 case STB_WEAK : IF_DEBUG(linker,debugBelch("weak " )); break;
3022 default: IF_DEBUG(linker,debugBelch("? " )); break;
3024 IF_DEBUG(linker,debugBelch(" " ));
3026 IF_DEBUG(linker,debugBelch("name=%s\n", strtab + stab[j].st_name ));
3030 if (nsymtabs == 0) {
3031 errorBelch("%s: didn't find any symbol tables", oc->fileName);
3038 static int getSectionKind_ELF( Elf_Shdr *hdr, int *is_bss )
3042 if (hdr->sh_type == SHT_PROGBITS
3043 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_EXECINSTR)) {
3044 /* .text-style section */
3045 return SECTIONKIND_CODE_OR_RODATA;
3048 if (hdr->sh_type == SHT_PROGBITS
3049 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_WRITE)) {
3050 /* .data-style section */
3051 return SECTIONKIND_RWDATA;
3054 if (hdr->sh_type == SHT_PROGBITS
3055 && (hdr->sh_flags & SHF_ALLOC) && !(hdr->sh_flags & SHF_WRITE)) {
3056 /* .rodata-style section */
3057 return SECTIONKIND_CODE_OR_RODATA;
3060 if (hdr->sh_type == SHT_NOBITS
3061 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_WRITE)) {
3062 /* .bss-style section */
3064 return SECTIONKIND_RWDATA;
3067 return SECTIONKIND_OTHER;
3072 ocGetNames_ELF ( ObjectCode* oc )
3077 char* ehdrC = (char*)(oc->image);
3078 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
3079 char* strtab = findElfSection ( ehdrC, SHT_STRTAB );
3080 Elf_Shdr* shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
3082 ASSERT(symhash != NULL);
3085 errorBelch("%s: no strtab", oc->fileName);
3090 for (i = 0; i < ehdr->e_shnum; i++) {
3091 /* Figure out what kind of section it is. Logic derived from
3092 Figure 1.14 ("Special Sections") of the ELF document
3093 ("Portable Formats Specification, Version 1.1"). */
3095 SectionKind kind = getSectionKind_ELF(&shdr[i], &is_bss);
3097 if (is_bss && shdr[i].sh_size > 0) {
3098 /* This is a non-empty .bss section. Allocate zeroed space for
3099 it, and set its .sh_offset field such that
3100 ehdrC + .sh_offset == addr_of_zeroed_space. */
3101 char* zspace = stgCallocBytes(1, shdr[i].sh_size,
3102 "ocGetNames_ELF(BSS)");
3103 shdr[i].sh_offset = ((char*)zspace) - ((char*)ehdrC);
3105 debugBelch("BSS section at 0x%x, size %d\n",
3106 zspace, shdr[i].sh_size);
3110 /* fill in the section info */
3111 if (kind != SECTIONKIND_OTHER && shdr[i].sh_size > 0) {
3112 addProddableBlock(oc, ehdrC + shdr[i].sh_offset, shdr[i].sh_size);
3113 addSection(oc, kind, ehdrC + shdr[i].sh_offset,
3114 ehdrC + shdr[i].sh_offset + shdr[i].sh_size - 1);
3117 if (shdr[i].sh_type != SHT_SYMTAB) continue;
3119 /* copy stuff into this module's object symbol table */
3120 stab = (Elf_Sym*) (ehdrC + shdr[i].sh_offset);
3121 nent = shdr[i].sh_size / sizeof(Elf_Sym);
3123 oc->n_symbols = nent;
3124 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
3125 "ocGetNames_ELF(oc->symbols)");
3127 for (j = 0; j < nent; j++) {
3129 char isLocal = FALSE; /* avoids uninit-var warning */
3131 char* nm = strtab + stab[j].st_name;
3132 int secno = stab[j].st_shndx;
3134 /* Figure out if we want to add it; if so, set ad to its
3135 address. Otherwise leave ad == NULL. */
3137 if (secno == SHN_COMMON) {
3139 ad = stgCallocBytes(1, stab[j].st_size, "ocGetNames_ELF(COMMON)");
3141 debugBelch("COMMON symbol, size %d name %s\n",
3142 stab[j].st_size, nm);
3144 /* Pointless to do addProddableBlock() for this area,
3145 since the linker should never poke around in it. */
3148 if ( ( ELF_ST_BIND(stab[j].st_info)==STB_GLOBAL
3149 || ELF_ST_BIND(stab[j].st_info)==STB_LOCAL
3151 /* and not an undefined symbol */
3152 && stab[j].st_shndx != SHN_UNDEF
3153 /* and not in a "special section" */
3154 && stab[j].st_shndx < SHN_LORESERVE
3156 /* and it's a not a section or string table or anything silly */
3157 ( ELF_ST_TYPE(stab[j].st_info)==STT_FUNC ||
3158 ELF_ST_TYPE(stab[j].st_info)==STT_OBJECT ||
3159 ELF_ST_TYPE(stab[j].st_info)==STT_NOTYPE
3162 /* Section 0 is the undefined section, hence > and not >=. */
3163 ASSERT(secno > 0 && secno < ehdr->e_shnum);
3165 if (shdr[secno].sh_type == SHT_NOBITS) {
3166 debugBelch(" BSS symbol, size %d off %d name %s\n",
3167 stab[j].st_size, stab[j].st_value, nm);
3170 ad = ehdrC + shdr[ secno ].sh_offset + stab[j].st_value;
3171 if (ELF_ST_BIND(stab[j].st_info)==STB_LOCAL) {
3174 #ifdef ELF_FUNCTION_DESC
3175 /* dlsym() and the initialisation table both give us function
3176 * descriptors, so to be consistent we store function descriptors
3177 * in the symbol table */
3178 if (ELF_ST_TYPE(stab[j].st_info) == STT_FUNC)
3179 ad = (char *)allocateFunctionDesc((Elf_Addr)ad);
3181 IF_DEBUG(linker,debugBelch( "addOTabName(GLOB): %10p %s %s",
3182 ad, oc->fileName, nm ));
3187 /* And the decision is ... */
3191 oc->symbols[j] = nm;
3194 /* Ignore entirely. */
3196 ghciInsertStrHashTable(oc->fileName, symhash, nm, ad);
3200 IF_DEBUG(linker,debugBelch( "skipping `%s'\n",
3201 strtab + stab[j].st_name ));
3204 "skipping bind = %d, type = %d, shndx = %d `%s'\n",
3205 (int)ELF_ST_BIND(stab[j].st_info),
3206 (int)ELF_ST_TYPE(stab[j].st_info),
3207 (int)stab[j].st_shndx,
3208 strtab + stab[j].st_name
3211 oc->symbols[j] = NULL;
3220 /* Do ELF relocations which lack an explicit addend. All x86-linux
3221 relocations appear to be of this form. */
3223 do_Elf_Rel_relocations ( ObjectCode* oc, char* ehdrC,
3224 Elf_Shdr* shdr, int shnum,
3225 Elf_Sym* stab, char* strtab )
3230 Elf_Rel* rtab = (Elf_Rel*) (ehdrC + shdr[shnum].sh_offset);
3231 int nent = shdr[shnum].sh_size / sizeof(Elf_Rel);
3232 int target_shndx = shdr[shnum].sh_info;
3233 int symtab_shndx = shdr[shnum].sh_link;
3235 stab = (Elf_Sym*) (ehdrC + shdr[ symtab_shndx ].sh_offset);
3236 targ = (Elf_Word*)(ehdrC + shdr[ target_shndx ].sh_offset);
3237 IF_DEBUG(linker,debugBelch( "relocations for section %d using symtab %d\n",
3238 target_shndx, symtab_shndx ));
3240 /* Skip sections that we're not interested in. */
3243 SectionKind kind = getSectionKind_ELF(&shdr[target_shndx], &is_bss);
3244 if (kind == SECTIONKIND_OTHER) {
3245 IF_DEBUG(linker,debugBelch( "skipping (target section not loaded)"));
3250 for (j = 0; j < nent; j++) {
3251 Elf_Addr offset = rtab[j].r_offset;
3252 Elf_Addr info = rtab[j].r_info;
3254 Elf_Addr P = ((Elf_Addr)targ) + offset;
3255 Elf_Word* pP = (Elf_Word*)P;
3260 StgStablePtr stablePtr;
3263 IF_DEBUG(linker,debugBelch( "Rel entry %3d is raw(%6p %6p)",
3264 j, (void*)offset, (void*)info ));
3266 IF_DEBUG(linker,debugBelch( " ZERO" ));
3269 Elf_Sym sym = stab[ELF_R_SYM(info)];
3270 /* First see if it is a local symbol. */
3271 if (ELF_ST_BIND(sym.st_info) == STB_LOCAL) {
3272 /* Yes, so we can get the address directly from the ELF symbol
3274 symbol = sym.st_name==0 ? "(noname)" : strtab+sym.st_name;
3276 (ehdrC + shdr[ sym.st_shndx ].sh_offset
3277 + stab[ELF_R_SYM(info)].st_value);
3280 symbol = strtab + sym.st_name;
3281 stablePtr = (StgStablePtr)lookupHashTable(stablehash, (StgWord)symbol);
3282 if (NULL == stablePtr) {
3283 /* No, so look up the name in our global table. */
3284 S_tmp = lookupSymbol( symbol );
3285 S = (Elf_Addr)S_tmp;
3287 stableVal = deRefStablePtr( stablePtr );
3288 addRootObject((void*)P);
3290 S = (Elf_Addr)S_tmp;
3294 errorBelch("%s: unknown symbol `%s'", oc->fileName, symbol);
3297 IF_DEBUG(linker,debugBelch( "`%s' resolves to %p\n", symbol, (void*)S ));
3300 IF_DEBUG(linker,debugBelch( "Reloc: P = %p S = %p A = %p\n",
3301 (void*)P, (void*)S, (void*)A ));
3302 checkProddableBlock ( oc, pP );
3306 switch (ELF_R_TYPE(info)) {
3307 # ifdef i386_HOST_ARCH
3308 case R_386_32: *pP = value; break;
3309 case R_386_PC32: *pP = value - P; break;
3312 errorBelch("%s: unhandled ELF relocation(Rel) type %lu\n",
3313 oc->fileName, (lnat)ELF_R_TYPE(info));
3321 /* Do ELF relocations for which explicit addends are supplied.
3322 sparc-solaris relocations appear to be of this form. */
3324 do_Elf_Rela_relocations ( ObjectCode* oc, char* ehdrC,
3325 Elf_Shdr* shdr, int shnum,
3326 Elf_Sym* stab, char* strtab )
3329 char *symbol = NULL;
3331 Elf_Rela* rtab = (Elf_Rela*) (ehdrC + shdr[shnum].sh_offset);
3332 int nent = shdr[shnum].sh_size / sizeof(Elf_Rela);
3333 int target_shndx = shdr[shnum].sh_info;
3334 int symtab_shndx = shdr[shnum].sh_link;
3336 stab = (Elf_Sym*) (ehdrC + shdr[ symtab_shndx ].sh_offset);
3337 targ = (Elf_Addr) (ehdrC + shdr[ target_shndx ].sh_offset);
3338 IF_DEBUG(linker,debugBelch( "relocations for section %d using symtab %d\n",
3339 target_shndx, symtab_shndx ));
3341 for (j = 0; j < nent; j++) {
3342 #if defined(DEBUG) || defined(sparc_HOST_ARCH) || defined(ia64_HOST_ARCH) || defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH)
3343 /* This #ifdef only serves to avoid unused-var warnings. */
3344 Elf_Addr offset = rtab[j].r_offset;
3345 Elf_Addr P = targ + offset;
3347 Elf_Addr info = rtab[j].r_info;
3348 Elf_Addr A = rtab[j].r_addend;
3352 # if defined(sparc_HOST_ARCH)
3353 Elf_Word* pP = (Elf_Word*)P;
3355 # elif defined(ia64_HOST_ARCH)
3356 Elf64_Xword *pP = (Elf64_Xword *)P;
3358 # elif defined(powerpc_HOST_ARCH)
3362 IF_DEBUG(linker,debugBelch( "Rel entry %3d is raw(%6p %6p %6p) ",
3363 j, (void*)offset, (void*)info,
3366 IF_DEBUG(linker,debugBelch( " ZERO" ));
3369 Elf_Sym sym = stab[ELF_R_SYM(info)];
3370 /* First see if it is a local symbol. */
3371 if (ELF_ST_BIND(sym.st_info) == STB_LOCAL) {
3372 /* Yes, so we can get the address directly from the ELF symbol
3374 symbol = sym.st_name==0 ? "(noname)" : strtab+sym.st_name;
3376 (ehdrC + shdr[ sym.st_shndx ].sh_offset
3377 + stab[ELF_R_SYM(info)].st_value);
3378 #ifdef ELF_FUNCTION_DESC
3379 /* Make a function descriptor for this function */
3380 if (S && ELF_ST_TYPE(sym.st_info) == STT_FUNC) {
3381 S = allocateFunctionDesc(S + A);
3386 /* No, so look up the name in our global table. */
3387 symbol = strtab + sym.st_name;
3388 S_tmp = lookupSymbol( symbol );
3389 S = (Elf_Addr)S_tmp;
3391 #ifdef ELF_FUNCTION_DESC
3392 /* If a function, already a function descriptor - we would
3393 have to copy it to add an offset. */
3394 if (S && (ELF_ST_TYPE(sym.st_info) == STT_FUNC) && (A != 0))
3395 errorBelch("%s: function %s with addend %p", oc->fileName, symbol, (void *)A);
3399 errorBelch("%s: unknown symbol `%s'", oc->fileName, symbol);
3402 IF_DEBUG(linker,debugBelch( "`%s' resolves to %p", symbol, (void*)S ));
3405 IF_DEBUG(linker,debugBelch("Reloc: P = %p S = %p A = %p\n",
3406 (void*)P, (void*)S, (void*)A ));
3407 /* checkProddableBlock ( oc, (void*)P ); */
3411 switch (ELF_R_TYPE(info)) {
3412 # if defined(sparc_HOST_ARCH)
3413 case R_SPARC_WDISP30:
3414 w1 = *pP & 0xC0000000;
3415 w2 = (Elf_Word)((value - P) >> 2);
3416 ASSERT((w2 & 0xC0000000) == 0);
3421 w1 = *pP & 0xFFC00000;
3422 w2 = (Elf_Word)(value >> 10);
3423 ASSERT((w2 & 0xFFC00000) == 0);
3429 w2 = (Elf_Word)(value & 0x3FF);
3430 ASSERT((w2 & ~0x3FF) == 0);
3434 /* According to the Sun documentation:
3436 This relocation type resembles R_SPARC_32, except it refers to an
3437 unaligned word. That is, the word to be relocated must be treated
3438 as four separate bytes with arbitrary alignment, not as a word
3439 aligned according to the architecture requirements.
3441 (JRS: which means that freeloading on the R_SPARC_32 case
3442 is probably wrong, but hey ...)
3446 w2 = (Elf_Word)value;
3449 # elif defined(ia64_HOST_ARCH)
3450 case R_IA64_DIR64LSB:
3451 case R_IA64_FPTR64LSB:
3454 case R_IA64_PCREL64LSB:
3457 case R_IA64_SEGREL64LSB:
3458 addr = findElfSegment(ehdrC, value);
3461 case R_IA64_GPREL22:
3462 ia64_reloc_gprel22(P, value);
3464 case R_IA64_LTOFF22:
3465 case R_IA64_LTOFF22X:
3466 case R_IA64_LTOFF_FPTR22:
3467 addr = allocateGOTEntry(value);
3468 ia64_reloc_gprel22(P, addr);
3470 case R_IA64_PCREL21B:
3471 ia64_reloc_pcrel21(P, S, oc);
3474 /* This goes with R_IA64_LTOFF22X and points to the load to
3475 * convert into a move. We don't implement relaxation. */
3477 # elif defined(powerpc_HOST_ARCH)
3478 case R_PPC_ADDR16_LO:
3479 *(Elf32_Half*) P = value;
3482 case R_PPC_ADDR16_HI:
3483 *(Elf32_Half*) P = value >> 16;
3486 case R_PPC_ADDR16_HA:
3487 *(Elf32_Half*) P = (value + 0x8000) >> 16;
3491 *(Elf32_Word *) P = value;
3495 *(Elf32_Word *) P = value - P;
3501 if( delta << 6 >> 6 != delta )
3503 value = makeJumpIsland( oc, ELF_R_SYM(info), value );
3506 if( value == 0 || delta << 6 >> 6 != delta )
3508 barf( "Unable to make ppcJumpIsland for #%d",
3514 *(Elf_Word *) P = (*(Elf_Word *) P & 0xfc000003)
3515 | (delta & 0x3fffffc);
3519 #if x86_64_HOST_ARCH
3521 *(Elf64_Xword *)P = value;
3526 StgInt64 off = value - P;
3527 if (off >= 0x7fffffffL || off < -0x80000000L) {
3528 barf("R_X86_64_PC32 relocation out of range: %s = %p",
3531 *(Elf64_Word *)P = (Elf64_Word)off;
3536 if (value >= 0x7fffffffL) {
3537 barf("R_X86_64_32 relocation out of range: %s = %p\n",
3540 *(Elf64_Word *)P = (Elf64_Word)value;
3544 if ((StgInt64)value > 0x7fffffffL || (StgInt64)value < -0x80000000L) {
3545 barf("R_X86_64_32S relocation out of range: %s = %p\n",
3548 *(Elf64_Sword *)P = (Elf64_Sword)value;
3553 errorBelch("%s: unhandled ELF relocation(RelA) type %lu\n",
3554 oc->fileName, (lnat)ELF_R_TYPE(info));
3563 ocResolve_ELF ( ObjectCode* oc )
3567 Elf_Sym* stab = NULL;
3568 char* ehdrC = (char*)(oc->image);
3569 Elf_Ehdr* ehdr = (Elf_Ehdr*) ehdrC;
3570 Elf_Shdr* shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
3572 /* first find "the" symbol table */
3573 stab = (Elf_Sym*) findElfSection ( ehdrC, SHT_SYMTAB );
3575 /* also go find the string table */
3576 strtab = findElfSection ( ehdrC, SHT_STRTAB );
3578 if (stab == NULL || strtab == NULL) {
3579 errorBelch("%s: can't find string or symbol table", oc->fileName);
3583 /* Process the relocation sections. */
3584 for (shnum = 0; shnum < ehdr->e_shnum; shnum++) {
3585 if (shdr[shnum].sh_type == SHT_REL) {
3586 ok = do_Elf_Rel_relocations ( oc, ehdrC, shdr,
3587 shnum, stab, strtab );
3591 if (shdr[shnum].sh_type == SHT_RELA) {
3592 ok = do_Elf_Rela_relocations ( oc, ehdrC, shdr,
3593 shnum, stab, strtab );
3598 /* Free the local symbol table; we won't need it again. */
3599 freeHashTable(oc->lochash, NULL);
3602 #if defined(powerpc_HOST_ARCH)
3603 ocFlushInstructionCache( oc );
3611 * Instructions are 41 bits long, packed into 128 bit bundles with a 5-bit template
3612 * at the front. The following utility functions pack and unpack instructions, and
3613 * take care of the most common relocations.
3616 #ifdef ia64_HOST_ARCH
3619 ia64_extract_instruction(Elf64_Xword *target)
3622 int slot = (Elf_Addr)target & 3;
3623 target = (Elf_Addr)target & ~3;
3631 return ((w1 >> 5) & 0x1ffffffffff);
3633 return (w1 >> 46) | ((w2 & 0x7fffff) << 18);
3637 barf("ia64_extract_instruction: invalid slot %p", target);
3642 ia64_deposit_instruction(Elf64_Xword *target, Elf64_Xword value)
3644 int slot = (Elf_Addr)target & 3;
3645 target = (Elf_Addr)target & ~3;
3650 *target |= value << 5;
3653 *target |= value << 46;
3654 *(target+1) |= value >> 18;
3657 *(target+1) |= value << 23;
3663 ia64_reloc_gprel22(Elf_Addr target, Elf_Addr value)
3665 Elf64_Xword instruction;
3666 Elf64_Sxword rel_value;
3668 rel_value = value - gp_val;
3669 if ((rel_value > 0x1fffff) || (rel_value < -0x1fffff))
3670 barf("GP-relative data out of range (address = 0x%lx, gp = 0x%lx)", value, gp_val);
3672 instruction = ia64_extract_instruction((Elf64_Xword *)target);
3673 instruction |= (((rel_value >> 0) & 0x07f) << 13) /* imm7b */
3674 | (((rel_value >> 7) & 0x1ff) << 27) /* imm9d */
3675 | (((rel_value >> 16) & 0x01f) << 22) /* imm5c */
3676 | ((Elf64_Xword)(rel_value < 0) << 36); /* s */
3677 ia64_deposit_instruction((Elf64_Xword *)target, instruction);
3681 ia64_reloc_pcrel21(Elf_Addr target, Elf_Addr value, ObjectCode *oc)
3683 Elf64_Xword instruction;
3684 Elf64_Sxword rel_value;
3687 entry = allocatePLTEntry(value, oc);
3689 rel_value = (entry >> 4) - (target >> 4);
3690 if ((rel_value > 0xfffff) || (rel_value < -0xfffff))
3691 barf("PLT entry too far away (entry = 0x%lx, target = 0x%lx)", entry, target);
3693 instruction = ia64_extract_instruction((Elf64_Xword *)target);
3694 instruction |= ((rel_value & 0xfffff) << 13) /* imm20b */
3695 | ((Elf64_Xword)(rel_value < 0) << 36); /* s */
3696 ia64_deposit_instruction((Elf64_Xword *)target, instruction);
3702 * PowerPC ELF specifics
3705 #ifdef powerpc_HOST_ARCH
3707 static int ocAllocateJumpIslands_ELF( ObjectCode *oc )
3713 ehdr = (Elf_Ehdr *) oc->image;
3714 shdr = (Elf_Shdr *) ( ((char *)oc->image) + ehdr->e_shoff );
3716 for( i = 0; i < ehdr->e_shnum; i++ )
3717 if( shdr[i].sh_type == SHT_SYMTAB )
3720 if( i == ehdr->e_shnum )
3722 errorBelch( "This ELF file contains no symtab" );
3726 if( shdr[i].sh_entsize != sizeof( Elf_Sym ) )
3728 errorBelch( "The entry size (%d) of the symtab isn't %d\n",
3729 shdr[i].sh_entsize, sizeof( Elf_Sym ) );
3734 return ocAllocateJumpIslands( oc, shdr[i].sh_size / sizeof( Elf_Sym ), 0 );
3737 #endif /* powerpc */
3741 /* --------------------------------------------------------------------------
3743 * ------------------------------------------------------------------------*/
3745 #if defined(OBJFORMAT_MACHO)
3748 Support for MachO linking on Darwin/MacOS X
3749 by Wolfgang Thaller (wolfgang.thaller@gmx.net)
3751 I hereby formally apologize for the hackish nature of this code.
3752 Things that need to be done:
3753 *) implement ocVerifyImage_MachO
3754 *) add still more sanity checks.
3757 #ifdef powerpc_HOST_ARCH
3758 static int ocAllocateJumpIslands_MachO(ObjectCode* oc)
3760 struct mach_header *header = (struct mach_header *) oc->image;
3761 struct load_command *lc = (struct load_command *) (header + 1);
3764 for( i = 0; i < header->ncmds; i++ )
3766 if( lc->cmd == LC_SYMTAB )
3768 // Find out the first and last undefined external
3769 // symbol, so we don't have to allocate too many
3771 struct symtab_command *symLC = (struct symtab_command *) lc;
3772 unsigned min = symLC->nsyms, max = 0;
3773 struct nlist *nlist =
3774 symLC ? (struct nlist*) ((char*) oc->image + symLC->symoff)
3776 for(i=0;i<symLC->nsyms;i++)
3778 if(nlist[i].n_type & N_STAB)
3780 else if(nlist[i].n_type & N_EXT)
3782 if((nlist[i].n_type & N_TYPE) == N_UNDF
3783 && (nlist[i].n_value == 0))
3793 return ocAllocateJumpIslands(oc, max - min + 1, min);
3798 lc = (struct load_command *) ( ((char *)lc) + lc->cmdsize );
3800 return ocAllocateJumpIslands(oc,0,0);
3804 static int ocVerifyImage_MachO(ObjectCode* oc STG_UNUSED)
3806 // FIXME: do some verifying here
3810 static int resolveImports(
3813 struct symtab_command *symLC,
3814 struct section *sect, // ptr to lazy or non-lazy symbol pointer section
3815 unsigned long *indirectSyms,
3816 struct nlist *nlist)
3819 size_t itemSize = 4;
3822 int isJumpTable = 0;
3823 if(!strcmp(sect->sectname,"__jump_table"))
3827 ASSERT(sect->reserved2 == itemSize);
3831 for(i=0; i*itemSize < sect->size;i++)
3833 // according to otool, reserved1 contains the first index into the indirect symbol table
3834 struct nlist *symbol = &nlist[indirectSyms[sect->reserved1+i]];
3835 char *nm = image + symLC->stroff + symbol->n_un.n_strx;
3838 if((symbol->n_type & N_TYPE) == N_UNDF
3839 && (symbol->n_type & N_EXT) && (symbol->n_value != 0))
3840 addr = (void*) (symbol->n_value);
3841 else if((addr = lookupLocalSymbol(oc,nm)) != NULL)
3844 addr = lookupSymbol(nm);
3847 errorBelch("\n%s: unknown symbol `%s'", oc->fileName, nm);
3855 checkProddableBlock(oc,image + sect->offset + i*itemSize);
3856 *(image + sect->offset + i*itemSize) = 0xe9; // jmp
3857 *(unsigned*)(image + sect->offset + i*itemSize + 1)
3858 = (char*)addr - (image + sect->offset + i*itemSize + 5);
3863 checkProddableBlock(oc,((void**)(image + sect->offset)) + i);
3864 ((void**)(image + sect->offset))[i] = addr;
3871 static unsigned long relocateAddress(
3874 struct section* sections,
3875 unsigned long address)
3878 for(i = 0; i < nSections; i++)
3880 if(sections[i].addr <= address
3881 && address < sections[i].addr + sections[i].size)
3883 return (unsigned long)oc->image
3884 + sections[i].offset + address - sections[i].addr;
3887 barf("Invalid Mach-O file:"
3888 "Address out of bounds while relocating object file");
3892 static int relocateSection(
3895 struct symtab_command *symLC, struct nlist *nlist,
3896 int nSections, struct section* sections, struct section *sect)
3898 struct relocation_info *relocs;
3901 if(!strcmp(sect->sectname,"__la_symbol_ptr"))
3903 else if(!strcmp(sect->sectname,"__nl_symbol_ptr"))
3905 else if(!strcmp(sect->sectname,"__la_sym_ptr2"))
3907 else if(!strcmp(sect->sectname,"__la_sym_ptr3"))
3911 relocs = (struct relocation_info*) (image + sect->reloff);
3915 if(relocs[i].r_address & R_SCATTERED)
3917 struct scattered_relocation_info *scat =
3918 (struct scattered_relocation_info*) &relocs[i];
3922 if(scat->r_length == 2)
3924 unsigned long word = 0;
3925 unsigned long* wordPtr = (unsigned long*) (image + sect->offset + scat->r_address);
3926 checkProddableBlock(oc,wordPtr);
3928 // Note on relocation types:
3929 // i386 uses the GENERIC_RELOC_* types,
3930 // while ppc uses special PPC_RELOC_* types.
3931 // *_RELOC_VANILLA and *_RELOC_PAIR have the same value
3932 // in both cases, all others are different.
3933 // Therefore, we use GENERIC_RELOC_VANILLA
3934 // and GENERIC_RELOC_PAIR instead of the PPC variants,
3935 // and use #ifdefs for the other types.
3937 // Step 1: Figure out what the relocated value should be
3938 if(scat->r_type == GENERIC_RELOC_VANILLA)
3940 word = *wordPtr + (unsigned long) relocateAddress(
3947 #ifdef powerpc_HOST_ARCH
3948 else if(scat->r_type == PPC_RELOC_SECTDIFF
3949 || scat->r_type == PPC_RELOC_LO16_SECTDIFF
3950 || scat->r_type == PPC_RELOC_HI16_SECTDIFF
3951 || scat->r_type == PPC_RELOC_HA16_SECTDIFF)
3953 else if(scat->r_type == GENERIC_RELOC_SECTDIFF)
3956 struct scattered_relocation_info *pair =
3957 (struct scattered_relocation_info*) &relocs[i+1];
3959 if(!pair->r_scattered || pair->r_type != GENERIC_RELOC_PAIR)
3960 barf("Invalid Mach-O file: "
3961 "RELOC_*_SECTDIFF not followed by RELOC_PAIR");
3963 word = (unsigned long)
3964 (relocateAddress(oc, nSections, sections, scat->r_value)
3965 - relocateAddress(oc, nSections, sections, pair->r_value));
3968 #ifdef powerpc_HOST_ARCH
3969 else if(scat->r_type == PPC_RELOC_HI16
3970 || scat->r_type == PPC_RELOC_LO16
3971 || scat->r_type == PPC_RELOC_HA16
3972 || scat->r_type == PPC_RELOC_LO14)
3973 { // these are generated by label+offset things
3974 struct relocation_info *pair = &relocs[i+1];
3975 if((pair->r_address & R_SCATTERED) || pair->r_type != PPC_RELOC_PAIR)
3976 barf("Invalid Mach-O file: "
3977 "PPC_RELOC_* not followed by PPC_RELOC_PAIR");
3979 if(scat->r_type == PPC_RELOC_LO16)
3981 word = ((unsigned short*) wordPtr)[1];
3982 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
3984 else if(scat->r_type == PPC_RELOC_LO14)
3986 barf("Unsupported Relocation: PPC_RELOC_LO14");
3987 word = ((unsigned short*) wordPtr)[1] & 0xFFFC;
3988 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
3990 else if(scat->r_type == PPC_RELOC_HI16)
3992 word = ((unsigned short*) wordPtr)[1] << 16;
3993 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF);
3995 else if(scat->r_type == PPC_RELOC_HA16)
3997 word = ((unsigned short*) wordPtr)[1] << 16;
3998 word += ((short)relocs[i+1].r_address & (short)0xFFFF);
4002 word += (unsigned long) relocateAddress(oc, nSections, sections, scat->r_value)
4009 continue; // ignore the others
4011 #ifdef powerpc_HOST_ARCH
4012 if(scat->r_type == GENERIC_RELOC_VANILLA
4013 || scat->r_type == PPC_RELOC_SECTDIFF)
4015 if(scat->r_type == GENERIC_RELOC_VANILLA
4016 || scat->r_type == GENERIC_RELOC_SECTDIFF)
4021 #ifdef powerpc_HOST_ARCH
4022 else if(scat->r_type == PPC_RELOC_LO16_SECTDIFF || scat->r_type == PPC_RELOC_LO16)
4024 ((unsigned short*) wordPtr)[1] = word & 0xFFFF;
4026 else if(scat->r_type == PPC_RELOC_HI16_SECTDIFF || scat->r_type == PPC_RELOC_HI16)
4028 ((unsigned short*) wordPtr)[1] = (word >> 16) & 0xFFFF;
4030 else if(scat->r_type == PPC_RELOC_HA16_SECTDIFF || scat->r_type == PPC_RELOC_HA16)
4032 ((unsigned short*) wordPtr)[1] = ((word >> 16) & 0xFFFF)
4033 + ((word & (1<<15)) ? 1 : 0);
4039 continue; // FIXME: I hope it's OK to ignore all the others.
4043 struct relocation_info *reloc = &relocs[i];
4044 if(reloc->r_pcrel && !reloc->r_extern)
4047 if(reloc->r_length == 2)
4049 unsigned long word = 0;
4050 #ifdef powerpc_HOST_ARCH
4051 unsigned long jumpIsland = 0;
4052 long offsetToJumpIsland = 0xBADBAD42; // initialise to bad value
4053 // to avoid warning and to catch
4057 unsigned long* wordPtr = (unsigned long*) (image + sect->offset + reloc->r_address);
4058 checkProddableBlock(oc,wordPtr);
4060 if(reloc->r_type == GENERIC_RELOC_VANILLA)
4064 #ifdef powerpc_HOST_ARCH
4065 else if(reloc->r_type == PPC_RELOC_LO16)
4067 word = ((unsigned short*) wordPtr)[1];
4068 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
4070 else if(reloc->r_type == PPC_RELOC_HI16)
4072 word = ((unsigned short*) wordPtr)[1] << 16;
4073 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF);
4075 else if(reloc->r_type == PPC_RELOC_HA16)
4077 word = ((unsigned short*) wordPtr)[1] << 16;
4078 word += ((short)relocs[i+1].r_address & (short)0xFFFF);
4080 else if(reloc->r_type == PPC_RELOC_BR24)
4083 word = (word & 0x03FFFFFC) | ((word & 0x02000000) ? 0xFC000000 : 0);
4087 if(!reloc->r_extern)
4090 sections[reloc->r_symbolnum-1].offset
4091 - sections[reloc->r_symbolnum-1].addr
4098 struct nlist *symbol = &nlist[reloc->r_symbolnum];
4099 char *nm = image + symLC->stroff + symbol->n_un.n_strx;
4100 void *symbolAddress = lookupSymbol(nm);
4103 errorBelch("\nunknown symbol `%s'", nm);
4109 #ifdef powerpc_HOST_ARCH
4110 // In the .o file, this should be a relative jump to NULL
4111 // and we'll change it to a relative jump to the symbol
4112 ASSERT(-word == reloc->r_address);
4113 jumpIsland = makeJumpIsland(oc,reloc->r_symbolnum,(unsigned long) symbolAddress);
4116 offsetToJumpIsland = word + jumpIsland
4117 - (((long)image) + sect->offset - sect->addr);
4120 word += (unsigned long) symbolAddress
4121 - (((long)image) + sect->offset - sect->addr);
4125 word += (unsigned long) symbolAddress;
4129 if(reloc->r_type == GENERIC_RELOC_VANILLA)
4134 #ifdef powerpc_HOST_ARCH
4135 else if(reloc->r_type == PPC_RELOC_LO16)
4137 ((unsigned short*) wordPtr)[1] = word & 0xFFFF;
4140 else if(reloc->r_type == PPC_RELOC_HI16)
4142 ((unsigned short*) wordPtr)[1] = (word >> 16) & 0xFFFF;
4145 else if(reloc->r_type == PPC_RELOC_HA16)
4147 ((unsigned short*) wordPtr)[1] = ((word >> 16) & 0xFFFF)
4148 + ((word & (1<<15)) ? 1 : 0);
4151 else if(reloc->r_type == PPC_RELOC_BR24)
4153 if((long)word > (long)0x01FFFFFF || (long)word < (long)0xFFE00000)
4155 // The branch offset is too large.
4156 // Therefore, we try to use a jump island.
4159 barf("unconditional relative branch out of range: "
4160 "no jump island available");
4163 word = offsetToJumpIsland;
4164 if((long)word > (long)0x01FFFFFF || (long)word < (long)0xFFE00000)
4165 barf("unconditional relative branch out of range: "
4166 "jump island out of range");
4168 *wordPtr = (*wordPtr & 0xFC000003) | (word & 0x03FFFFFC);
4173 barf("\nunknown relocation %d",reloc->r_type);
4180 static int ocGetNames_MachO(ObjectCode* oc)
4182 char *image = (char*) oc->image;
4183 struct mach_header *header = (struct mach_header*) image;
4184 struct load_command *lc = (struct load_command*) (image + sizeof(struct mach_header));
4185 unsigned i,curSymbol = 0;
4186 struct segment_command *segLC = NULL;
4187 struct section *sections;
4188 struct symtab_command *symLC = NULL;
4189 struct nlist *nlist;
4190 unsigned long commonSize = 0;
4191 char *commonStorage = NULL;
4192 unsigned long commonCounter;
4194 for(i=0;i<header->ncmds;i++)
4196 if(lc->cmd == LC_SEGMENT)
4197 segLC = (struct segment_command*) lc;
4198 else if(lc->cmd == LC_SYMTAB)
4199 symLC = (struct symtab_command*) lc;
4200 lc = (struct load_command *) ( ((char*)lc) + lc->cmdsize );
4203 sections = (struct section*) (segLC+1);
4204 nlist = symLC ? (struct nlist*) (image + symLC->symoff)
4207 for(i=0;i<segLC->nsects;i++)
4209 if(sections[i].size == 0)
4212 if((sections[i].flags & SECTION_TYPE) == S_ZEROFILL)
4214 char * zeroFillArea = stgCallocBytes(1,sections[i].size,
4215 "ocGetNames_MachO(common symbols)");
4216 sections[i].offset = zeroFillArea - image;
4219 if(!strcmp(sections[i].sectname,"__text"))
4220 addSection(oc, SECTIONKIND_CODE_OR_RODATA,
4221 (void*) (image + sections[i].offset),
4222 (void*) (image + sections[i].offset + sections[i].size));
4223 else if(!strcmp(sections[i].sectname,"__const"))
4224 addSection(oc, SECTIONKIND_RWDATA,
4225 (void*) (image + sections[i].offset),
4226 (void*) (image + sections[i].offset + sections[i].size));
4227 else if(!strcmp(sections[i].sectname,"__data"))
4228 addSection(oc, SECTIONKIND_RWDATA,
4229 (void*) (image + sections[i].offset),
4230 (void*) (image + sections[i].offset + sections[i].size));
4231 else if(!strcmp(sections[i].sectname,"__bss")
4232 || !strcmp(sections[i].sectname,"__common"))
4233 addSection(oc, SECTIONKIND_RWDATA,
4234 (void*) (image + sections[i].offset),
4235 (void*) (image + sections[i].offset + sections[i].size));
4237 addProddableBlock(oc, (void*) (image + sections[i].offset),
4241 // count external symbols defined here
4245 for(i=0;i<symLC->nsyms;i++)
4247 if(nlist[i].n_type & N_STAB)
4249 else if(nlist[i].n_type & N_EXT)
4251 if((nlist[i].n_type & N_TYPE) == N_UNDF
4252 && (nlist[i].n_value != 0))
4254 commonSize += nlist[i].n_value;
4257 else if((nlist[i].n_type & N_TYPE) == N_SECT)
4262 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
4263 "ocGetNames_MachO(oc->symbols)");
4267 for(i=0;i<symLC->nsyms;i++)
4269 if(nlist[i].n_type & N_STAB)
4271 else if((nlist[i].n_type & N_TYPE) == N_SECT)
4273 if(nlist[i].n_type & N_EXT)
4275 char *nm = image + symLC->stroff + nlist[i].n_un.n_strx;
4276 ghciInsertStrHashTable(oc->fileName, symhash, nm,
4278 + sections[nlist[i].n_sect-1].offset
4279 - sections[nlist[i].n_sect-1].addr
4280 + nlist[i].n_value);
4281 oc->symbols[curSymbol++] = nm;
4285 char *nm = image + symLC->stroff + nlist[i].n_un.n_strx;
4286 ghciInsertStrHashTable(oc->fileName, oc->lochash, nm,
4288 + sections[nlist[i].n_sect-1].offset
4289 - sections[nlist[i].n_sect-1].addr
4290 + nlist[i].n_value);
4296 commonStorage = stgCallocBytes(1,commonSize,"ocGetNames_MachO(common symbols)");
4297 commonCounter = (unsigned long)commonStorage;
4300 for(i=0;i<symLC->nsyms;i++)
4302 if((nlist[i].n_type & N_TYPE) == N_UNDF
4303 && (nlist[i].n_type & N_EXT) && (nlist[i].n_value != 0))
4305 char *nm = image + symLC->stroff + nlist[i].n_un.n_strx;
4306 unsigned long sz = nlist[i].n_value;
4308 nlist[i].n_value = commonCounter;
4310 ghciInsertStrHashTable(oc->fileName, symhash, nm,
4311 (void*)commonCounter);
4312 oc->symbols[curSymbol++] = nm;
4314 commonCounter += sz;
4321 static int ocResolve_MachO(ObjectCode* oc)
4323 char *image = (char*) oc->image;
4324 struct mach_header *header = (struct mach_header*) image;
4325 struct load_command *lc = (struct load_command*) (image + sizeof(struct mach_header));
4327 struct segment_command *segLC = NULL;
4328 struct section *sections;
4329 struct symtab_command *symLC = NULL;
4330 struct dysymtab_command *dsymLC = NULL;
4331 struct nlist *nlist;
4333 for(i=0;i<header->ncmds;i++)
4335 if(lc->cmd == LC_SEGMENT)
4336 segLC = (struct segment_command*) lc;
4337 else if(lc->cmd == LC_SYMTAB)
4338 symLC = (struct symtab_command*) lc;
4339 else if(lc->cmd == LC_DYSYMTAB)
4340 dsymLC = (struct dysymtab_command*) lc;
4341 lc = (struct load_command *) ( ((char*)lc) + lc->cmdsize );
4344 sections = (struct section*) (segLC+1);
4345 nlist = symLC ? (struct nlist*) (image + symLC->symoff)
4350 unsigned long *indirectSyms
4351 = (unsigned long*) (image + dsymLC->indirectsymoff);
4353 for(i=0;i<segLC->nsects;i++)
4355 if( !strcmp(sections[i].sectname,"__la_symbol_ptr")
4356 || !strcmp(sections[i].sectname,"__la_sym_ptr2")
4357 || !strcmp(sections[i].sectname,"__la_sym_ptr3"))
4359 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4362 else if(!strcmp(sections[i].sectname,"__nl_symbol_ptr")
4363 || !strcmp(sections[i].sectname,"__pointers"))
4365 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4368 else if(!strcmp(sections[i].sectname,"__jump_table"))
4370 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4376 for(i=0;i<segLC->nsects;i++)
4378 if(!relocateSection(oc,image,symLC,nlist,segLC->nsects,sections,§ions[i]))
4382 /* Free the local symbol table; we won't need it again. */
4383 freeHashTable(oc->lochash, NULL);
4386 #if defined (powerpc_HOST_ARCH)
4387 ocFlushInstructionCache( oc );
4393 #ifdef powerpc_HOST_ARCH
4395 * The Mach-O object format uses leading underscores. But not everywhere.
4396 * There is a small number of runtime support functions defined in
4397 * libcc_dynamic.a whose name does not have a leading underscore.
4398 * As a consequence, we can't get their address from C code.
4399 * We have to use inline assembler just to take the address of a function.
4403 static void machoInitSymbolsWithoutUnderscore()
4405 extern void* symbolsWithoutUnderscore[];
4406 void **p = symbolsWithoutUnderscore;
4407 __asm__ volatile(".globl _symbolsWithoutUnderscore\n.data\n_symbolsWithoutUnderscore:");
4411 __asm__ volatile(".long " # x);
4413 RTS_MACHO_NOUNDERLINE_SYMBOLS
4415 __asm__ volatile(".text");
4419 ghciInsertStrHashTable("(GHCi built-in symbols)", symhash, #x, *p++);
4421 RTS_MACHO_NOUNDERLINE_SYMBOLS
4428 * Figure out by how much to shift the entire Mach-O file in memory
4429 * when loading so that its single segment ends up 16-byte-aligned
4431 static int machoGetMisalignment( FILE * f )
4433 struct mach_header header;
4436 fread(&header, sizeof(header), 1, f);
4439 if(header.magic != MH_MAGIC)
4442 misalignment = (header.sizeofcmds + sizeof(header))
4445 return misalignment ? (16 - misalignment) : 0;