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 #ifdef EM_SPARC32PLUS
2912 case EM_SPARC32PLUS:
2914 case EM_SPARC: IF_DEBUG(linker,debugBelch( "sparc" )); break;
2916 case EM_IA_64: IF_DEBUG(linker,debugBelch( "ia64" )); break;
2918 case EM_PPC: IF_DEBUG(linker,debugBelch( "powerpc32" )); break;
2920 case EM_X86_64: IF_DEBUG(linker,debugBelch( "x86_64" )); break;
2922 default: IF_DEBUG(linker,debugBelch( "unknown" ));
2923 errorBelch("%s: unknown architecture", oc->fileName);
2927 IF_DEBUG(linker,debugBelch(
2928 "\nSection header table: start %ld, n_entries %d, ent_size %d\n",
2929 (long)ehdr->e_shoff, ehdr->e_shnum, ehdr->e_shentsize ));
2931 ASSERT (ehdr->e_shentsize == sizeof(Elf_Shdr));
2933 shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
2935 if (ehdr->e_shstrndx == SHN_UNDEF) {
2936 errorBelch("%s: no section header string table", oc->fileName);
2939 IF_DEBUG(linker,debugBelch( "Section header string table is section %d\n",
2941 sh_strtab = ehdrC + shdr[ehdr->e_shstrndx].sh_offset;
2944 for (i = 0; i < ehdr->e_shnum; i++) {
2945 IF_DEBUG(linker,debugBelch("%2d: ", i ));
2946 IF_DEBUG(linker,debugBelch("type=%2d ", (int)shdr[i].sh_type ));
2947 IF_DEBUG(linker,debugBelch("size=%4d ", (int)shdr[i].sh_size ));
2948 IF_DEBUG(linker,debugBelch("offs=%4d ", (int)shdr[i].sh_offset ));
2949 IF_DEBUG(linker,debugBelch(" (%p .. %p) ",
2950 ehdrC + shdr[i].sh_offset,
2951 ehdrC + shdr[i].sh_offset + shdr[i].sh_size - 1));
2953 if (shdr[i].sh_type == SHT_REL) {
2954 IF_DEBUG(linker,debugBelch("Rel " ));
2955 } else if (shdr[i].sh_type == SHT_RELA) {
2956 IF_DEBUG(linker,debugBelch("RelA " ));
2958 IF_DEBUG(linker,debugBelch(" "));
2961 IF_DEBUG(linker,debugBelch("sname=%s\n", sh_strtab + shdr[i].sh_name ));
2965 IF_DEBUG(linker,debugBelch( "\nString tables" ));
2968 for (i = 0; i < ehdr->e_shnum; i++) {
2969 if (shdr[i].sh_type == SHT_STRTAB
2970 /* Ignore the section header's string table. */
2971 && i != ehdr->e_shstrndx
2972 /* Ignore string tables named .stabstr, as they contain
2974 && 0 != memcmp(".stabstr", sh_strtab + shdr[i].sh_name, 8)
2976 IF_DEBUG(linker,debugBelch(" section %d is a normal string table", i ));
2977 strtab = ehdrC + shdr[i].sh_offset;
2982 errorBelch("%s: no string tables, or too many", oc->fileName);
2987 IF_DEBUG(linker,debugBelch( "\nSymbol tables" ));
2988 for (i = 0; i < ehdr->e_shnum; i++) {
2989 if (shdr[i].sh_type != SHT_SYMTAB) continue;
2990 IF_DEBUG(linker,debugBelch( "section %d is a symbol table\n", i ));
2992 stab = (Elf_Sym*) (ehdrC + shdr[i].sh_offset);
2993 nent = shdr[i].sh_size / sizeof(Elf_Sym);
2994 IF_DEBUG(linker,debugBelch( " number of entries is apparently %d (%ld rem)\n",
2996 (long)shdr[i].sh_size % sizeof(Elf_Sym)
2998 if (0 != shdr[i].sh_size % sizeof(Elf_Sym)) {
2999 errorBelch("%s: non-integral number of symbol table entries", oc->fileName);
3002 for (j = 0; j < nent; j++) {
3003 IF_DEBUG(linker,debugBelch(" %2d ", j ));
3004 IF_DEBUG(linker,debugBelch(" sec=%-5d size=%-3d val=%5p ",
3005 (int)stab[j].st_shndx,
3006 (int)stab[j].st_size,
3007 (char*)stab[j].st_value ));
3009 IF_DEBUG(linker,debugBelch("type=" ));
3010 switch (ELF_ST_TYPE(stab[j].st_info)) {
3011 case STT_NOTYPE: IF_DEBUG(linker,debugBelch("notype " )); break;
3012 case STT_OBJECT: IF_DEBUG(linker,debugBelch("object " )); break;
3013 case STT_FUNC : IF_DEBUG(linker,debugBelch("func " )); break;
3014 case STT_SECTION: IF_DEBUG(linker,debugBelch("section" )); break;
3015 case STT_FILE: IF_DEBUG(linker,debugBelch("file " )); break;
3016 default: IF_DEBUG(linker,debugBelch("? " )); break;
3018 IF_DEBUG(linker,debugBelch(" " ));
3020 IF_DEBUG(linker,debugBelch("bind=" ));
3021 switch (ELF_ST_BIND(stab[j].st_info)) {
3022 case STB_LOCAL : IF_DEBUG(linker,debugBelch("local " )); break;
3023 case STB_GLOBAL: IF_DEBUG(linker,debugBelch("global" )); break;
3024 case STB_WEAK : IF_DEBUG(linker,debugBelch("weak " )); break;
3025 default: IF_DEBUG(linker,debugBelch("? " )); break;
3027 IF_DEBUG(linker,debugBelch(" " ));
3029 IF_DEBUG(linker,debugBelch("name=%s\n", strtab + stab[j].st_name ));
3033 if (nsymtabs == 0) {
3034 errorBelch("%s: didn't find any symbol tables", oc->fileName);
3041 static int getSectionKind_ELF( Elf_Shdr *hdr, int *is_bss )
3045 if (hdr->sh_type == SHT_PROGBITS
3046 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_EXECINSTR)) {
3047 /* .text-style section */
3048 return SECTIONKIND_CODE_OR_RODATA;
3051 if (hdr->sh_type == SHT_PROGBITS
3052 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_WRITE)) {
3053 /* .data-style section */
3054 return SECTIONKIND_RWDATA;
3057 if (hdr->sh_type == SHT_PROGBITS
3058 && (hdr->sh_flags & SHF_ALLOC) && !(hdr->sh_flags & SHF_WRITE)) {
3059 /* .rodata-style section */
3060 return SECTIONKIND_CODE_OR_RODATA;
3063 if (hdr->sh_type == SHT_NOBITS
3064 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_WRITE)) {
3065 /* .bss-style section */
3067 return SECTIONKIND_RWDATA;
3070 return SECTIONKIND_OTHER;
3075 ocGetNames_ELF ( ObjectCode* oc )
3080 char* ehdrC = (char*)(oc->image);
3081 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
3082 char* strtab = findElfSection ( ehdrC, SHT_STRTAB );
3083 Elf_Shdr* shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
3085 ASSERT(symhash != NULL);
3088 errorBelch("%s: no strtab", oc->fileName);
3093 for (i = 0; i < ehdr->e_shnum; i++) {
3094 /* Figure out what kind of section it is. Logic derived from
3095 Figure 1.14 ("Special Sections") of the ELF document
3096 ("Portable Formats Specification, Version 1.1"). */
3098 SectionKind kind = getSectionKind_ELF(&shdr[i], &is_bss);
3100 if (is_bss && shdr[i].sh_size > 0) {
3101 /* This is a non-empty .bss section. Allocate zeroed space for
3102 it, and set its .sh_offset field such that
3103 ehdrC + .sh_offset == addr_of_zeroed_space. */
3104 char* zspace = stgCallocBytes(1, shdr[i].sh_size,
3105 "ocGetNames_ELF(BSS)");
3106 shdr[i].sh_offset = ((char*)zspace) - ((char*)ehdrC);
3108 debugBelch("BSS section at 0x%x, size %d\n",
3109 zspace, shdr[i].sh_size);
3113 /* fill in the section info */
3114 if (kind != SECTIONKIND_OTHER && shdr[i].sh_size > 0) {
3115 addProddableBlock(oc, ehdrC + shdr[i].sh_offset, shdr[i].sh_size);
3116 addSection(oc, kind, ehdrC + shdr[i].sh_offset,
3117 ehdrC + shdr[i].sh_offset + shdr[i].sh_size - 1);
3120 if (shdr[i].sh_type != SHT_SYMTAB) continue;
3122 /* copy stuff into this module's object symbol table */
3123 stab = (Elf_Sym*) (ehdrC + shdr[i].sh_offset);
3124 nent = shdr[i].sh_size / sizeof(Elf_Sym);
3126 oc->n_symbols = nent;
3127 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
3128 "ocGetNames_ELF(oc->symbols)");
3130 for (j = 0; j < nent; j++) {
3132 char isLocal = FALSE; /* avoids uninit-var warning */
3134 char* nm = strtab + stab[j].st_name;
3135 int secno = stab[j].st_shndx;
3137 /* Figure out if we want to add it; if so, set ad to its
3138 address. Otherwise leave ad == NULL. */
3140 if (secno == SHN_COMMON) {
3142 ad = stgCallocBytes(1, stab[j].st_size, "ocGetNames_ELF(COMMON)");
3144 debugBelch("COMMON symbol, size %d name %s\n",
3145 stab[j].st_size, nm);
3147 /* Pointless to do addProddableBlock() for this area,
3148 since the linker should never poke around in it. */
3151 if ( ( ELF_ST_BIND(stab[j].st_info)==STB_GLOBAL
3152 || ELF_ST_BIND(stab[j].st_info)==STB_LOCAL
3154 /* and not an undefined symbol */
3155 && stab[j].st_shndx != SHN_UNDEF
3156 /* and not in a "special section" */
3157 && stab[j].st_shndx < SHN_LORESERVE
3159 /* and it's a not a section or string table or anything silly */
3160 ( ELF_ST_TYPE(stab[j].st_info)==STT_FUNC ||
3161 ELF_ST_TYPE(stab[j].st_info)==STT_OBJECT ||
3162 ELF_ST_TYPE(stab[j].st_info)==STT_NOTYPE
3165 /* Section 0 is the undefined section, hence > and not >=. */
3166 ASSERT(secno > 0 && secno < ehdr->e_shnum);
3168 if (shdr[secno].sh_type == SHT_NOBITS) {
3169 debugBelch(" BSS symbol, size %d off %d name %s\n",
3170 stab[j].st_size, stab[j].st_value, nm);
3173 ad = ehdrC + shdr[ secno ].sh_offset + stab[j].st_value;
3174 if (ELF_ST_BIND(stab[j].st_info)==STB_LOCAL) {
3177 #ifdef ELF_FUNCTION_DESC
3178 /* dlsym() and the initialisation table both give us function
3179 * descriptors, so to be consistent we store function descriptors
3180 * in the symbol table */
3181 if (ELF_ST_TYPE(stab[j].st_info) == STT_FUNC)
3182 ad = (char *)allocateFunctionDesc((Elf_Addr)ad);
3184 IF_DEBUG(linker,debugBelch( "addOTabName(GLOB): %10p %s %s",
3185 ad, oc->fileName, nm ));
3190 /* And the decision is ... */
3194 oc->symbols[j] = nm;
3197 /* Ignore entirely. */
3199 ghciInsertStrHashTable(oc->fileName, symhash, nm, ad);
3203 IF_DEBUG(linker,debugBelch( "skipping `%s'\n",
3204 strtab + stab[j].st_name ));
3207 "skipping bind = %d, type = %d, shndx = %d `%s'\n",
3208 (int)ELF_ST_BIND(stab[j].st_info),
3209 (int)ELF_ST_TYPE(stab[j].st_info),
3210 (int)stab[j].st_shndx,
3211 strtab + stab[j].st_name
3214 oc->symbols[j] = NULL;
3223 /* Do ELF relocations which lack an explicit addend. All x86-linux
3224 relocations appear to be of this form. */
3226 do_Elf_Rel_relocations ( ObjectCode* oc, char* ehdrC,
3227 Elf_Shdr* shdr, int shnum,
3228 Elf_Sym* stab, char* strtab )
3233 Elf_Rel* rtab = (Elf_Rel*) (ehdrC + shdr[shnum].sh_offset);
3234 int nent = shdr[shnum].sh_size / sizeof(Elf_Rel);
3235 int target_shndx = shdr[shnum].sh_info;
3236 int symtab_shndx = shdr[shnum].sh_link;
3238 stab = (Elf_Sym*) (ehdrC + shdr[ symtab_shndx ].sh_offset);
3239 targ = (Elf_Word*)(ehdrC + shdr[ target_shndx ].sh_offset);
3240 IF_DEBUG(linker,debugBelch( "relocations for section %d using symtab %d\n",
3241 target_shndx, symtab_shndx ));
3243 /* Skip sections that we're not interested in. */
3246 SectionKind kind = getSectionKind_ELF(&shdr[target_shndx], &is_bss);
3247 if (kind == SECTIONKIND_OTHER) {
3248 IF_DEBUG(linker,debugBelch( "skipping (target section not loaded)"));
3253 for (j = 0; j < nent; j++) {
3254 Elf_Addr offset = rtab[j].r_offset;
3255 Elf_Addr info = rtab[j].r_info;
3257 Elf_Addr P = ((Elf_Addr)targ) + offset;
3258 Elf_Word* pP = (Elf_Word*)P;
3263 StgStablePtr stablePtr;
3266 IF_DEBUG(linker,debugBelch( "Rel entry %3d is raw(%6p %6p)",
3267 j, (void*)offset, (void*)info ));
3269 IF_DEBUG(linker,debugBelch( " ZERO" ));
3272 Elf_Sym sym = stab[ELF_R_SYM(info)];
3273 /* First see if it is a local symbol. */
3274 if (ELF_ST_BIND(sym.st_info) == STB_LOCAL) {
3275 /* Yes, so we can get the address directly from the ELF symbol
3277 symbol = sym.st_name==0 ? "(noname)" : strtab+sym.st_name;
3279 (ehdrC + shdr[ sym.st_shndx ].sh_offset
3280 + stab[ELF_R_SYM(info)].st_value);
3283 symbol = strtab + sym.st_name;
3284 stablePtr = (StgStablePtr)lookupHashTable(stablehash, (StgWord)symbol);
3285 if (NULL == stablePtr) {
3286 /* No, so look up the name in our global table. */
3287 S_tmp = lookupSymbol( symbol );
3288 S = (Elf_Addr)S_tmp;
3290 stableVal = deRefStablePtr( stablePtr );
3291 addRootObject((void*)P);
3293 S = (Elf_Addr)S_tmp;
3297 errorBelch("%s: unknown symbol `%s'", oc->fileName, symbol);
3300 IF_DEBUG(linker,debugBelch( "`%s' resolves to %p\n", symbol, (void*)S ));
3303 IF_DEBUG(linker,debugBelch( "Reloc: P = %p S = %p A = %p\n",
3304 (void*)P, (void*)S, (void*)A ));
3305 checkProddableBlock ( oc, pP );
3309 switch (ELF_R_TYPE(info)) {
3310 # ifdef i386_HOST_ARCH
3311 case R_386_32: *pP = value; break;
3312 case R_386_PC32: *pP = value - P; break;
3315 errorBelch("%s: unhandled ELF relocation(Rel) type %lu\n",
3316 oc->fileName, (lnat)ELF_R_TYPE(info));
3324 /* Do ELF relocations for which explicit addends are supplied.
3325 sparc-solaris relocations appear to be of this form. */
3327 do_Elf_Rela_relocations ( ObjectCode* oc, char* ehdrC,
3328 Elf_Shdr* shdr, int shnum,
3329 Elf_Sym* stab, char* strtab )
3332 char *symbol = NULL;
3334 Elf_Rela* rtab = (Elf_Rela*) (ehdrC + shdr[shnum].sh_offset);
3335 int nent = shdr[shnum].sh_size / sizeof(Elf_Rela);
3336 int target_shndx = shdr[shnum].sh_info;
3337 int symtab_shndx = shdr[shnum].sh_link;
3339 stab = (Elf_Sym*) (ehdrC + shdr[ symtab_shndx ].sh_offset);
3340 targ = (Elf_Addr) (ehdrC + shdr[ target_shndx ].sh_offset);
3341 IF_DEBUG(linker,debugBelch( "relocations for section %d using symtab %d\n",
3342 target_shndx, symtab_shndx ));
3344 for (j = 0; j < nent; j++) {
3345 #if defined(DEBUG) || defined(sparc_HOST_ARCH) || defined(ia64_HOST_ARCH) || defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH)
3346 /* This #ifdef only serves to avoid unused-var warnings. */
3347 Elf_Addr offset = rtab[j].r_offset;
3348 Elf_Addr P = targ + offset;
3350 Elf_Addr info = rtab[j].r_info;
3351 Elf_Addr A = rtab[j].r_addend;
3355 # if defined(sparc_HOST_ARCH)
3356 Elf_Word* pP = (Elf_Word*)P;
3358 # elif defined(ia64_HOST_ARCH)
3359 Elf64_Xword *pP = (Elf64_Xword *)P;
3361 # elif defined(powerpc_HOST_ARCH)
3365 IF_DEBUG(linker,debugBelch( "Rel entry %3d is raw(%6p %6p %6p) ",
3366 j, (void*)offset, (void*)info,
3369 IF_DEBUG(linker,debugBelch( " ZERO" ));
3372 Elf_Sym sym = stab[ELF_R_SYM(info)];
3373 /* First see if it is a local symbol. */
3374 if (ELF_ST_BIND(sym.st_info) == STB_LOCAL) {
3375 /* Yes, so we can get the address directly from the ELF symbol
3377 symbol = sym.st_name==0 ? "(noname)" : strtab+sym.st_name;
3379 (ehdrC + shdr[ sym.st_shndx ].sh_offset
3380 + stab[ELF_R_SYM(info)].st_value);
3381 #ifdef ELF_FUNCTION_DESC
3382 /* Make a function descriptor for this function */
3383 if (S && ELF_ST_TYPE(sym.st_info) == STT_FUNC) {
3384 S = allocateFunctionDesc(S + A);
3389 /* No, so look up the name in our global table. */
3390 symbol = strtab + sym.st_name;
3391 S_tmp = lookupSymbol( symbol );
3392 S = (Elf_Addr)S_tmp;
3394 #ifdef ELF_FUNCTION_DESC
3395 /* If a function, already a function descriptor - we would
3396 have to copy it to add an offset. */
3397 if (S && (ELF_ST_TYPE(sym.st_info) == STT_FUNC) && (A != 0))
3398 errorBelch("%s: function %s with addend %p", oc->fileName, symbol, (void *)A);
3402 errorBelch("%s: unknown symbol `%s'", oc->fileName, symbol);
3405 IF_DEBUG(linker,debugBelch( "`%s' resolves to %p", symbol, (void*)S ));
3408 IF_DEBUG(linker,debugBelch("Reloc: P = %p S = %p A = %p\n",
3409 (void*)P, (void*)S, (void*)A ));
3410 /* checkProddableBlock ( oc, (void*)P ); */
3414 switch (ELF_R_TYPE(info)) {
3415 # if defined(sparc_HOST_ARCH)
3416 case R_SPARC_WDISP30:
3417 w1 = *pP & 0xC0000000;
3418 w2 = (Elf_Word)((value - P) >> 2);
3419 ASSERT((w2 & 0xC0000000) == 0);
3424 w1 = *pP & 0xFFC00000;
3425 w2 = (Elf_Word)(value >> 10);
3426 ASSERT((w2 & 0xFFC00000) == 0);
3432 w2 = (Elf_Word)(value & 0x3FF);
3433 ASSERT((w2 & ~0x3FF) == 0);
3437 /* According to the Sun documentation:
3439 This relocation type resembles R_SPARC_32, except it refers to an
3440 unaligned word. That is, the word to be relocated must be treated
3441 as four separate bytes with arbitrary alignment, not as a word
3442 aligned according to the architecture requirements.
3444 (JRS: which means that freeloading on the R_SPARC_32 case
3445 is probably wrong, but hey ...)
3449 w2 = (Elf_Word)value;
3452 # elif defined(ia64_HOST_ARCH)
3453 case R_IA64_DIR64LSB:
3454 case R_IA64_FPTR64LSB:
3457 case R_IA64_PCREL64LSB:
3460 case R_IA64_SEGREL64LSB:
3461 addr = findElfSegment(ehdrC, value);
3464 case R_IA64_GPREL22:
3465 ia64_reloc_gprel22(P, value);
3467 case R_IA64_LTOFF22:
3468 case R_IA64_LTOFF22X:
3469 case R_IA64_LTOFF_FPTR22:
3470 addr = allocateGOTEntry(value);
3471 ia64_reloc_gprel22(P, addr);
3473 case R_IA64_PCREL21B:
3474 ia64_reloc_pcrel21(P, S, oc);
3477 /* This goes with R_IA64_LTOFF22X and points to the load to
3478 * convert into a move. We don't implement relaxation. */
3480 # elif defined(powerpc_HOST_ARCH)
3481 case R_PPC_ADDR16_LO:
3482 *(Elf32_Half*) P = value;
3485 case R_PPC_ADDR16_HI:
3486 *(Elf32_Half*) P = value >> 16;
3489 case R_PPC_ADDR16_HA:
3490 *(Elf32_Half*) P = (value + 0x8000) >> 16;
3494 *(Elf32_Word *) P = value;
3498 *(Elf32_Word *) P = value - P;
3504 if( delta << 6 >> 6 != delta )
3506 value = makeJumpIsland( oc, ELF_R_SYM(info), value );
3509 if( value == 0 || delta << 6 >> 6 != delta )
3511 barf( "Unable to make ppcJumpIsland for #%d",
3517 *(Elf_Word *) P = (*(Elf_Word *) P & 0xfc000003)
3518 | (delta & 0x3fffffc);
3522 #if x86_64_HOST_ARCH
3524 *(Elf64_Xword *)P = value;
3529 StgInt64 off = value - P;
3530 if (off >= 0x7fffffffL || off < -0x80000000L) {
3531 barf("R_X86_64_PC32 relocation out of range: %s = %p",
3534 *(Elf64_Word *)P = (Elf64_Word)off;
3539 if (value >= 0x7fffffffL) {
3540 barf("R_X86_64_32 relocation out of range: %s = %p\n",
3543 *(Elf64_Word *)P = (Elf64_Word)value;
3547 if ((StgInt64)value > 0x7fffffffL || (StgInt64)value < -0x80000000L) {
3548 barf("R_X86_64_32S relocation out of range: %s = %p\n",
3551 *(Elf64_Sword *)P = (Elf64_Sword)value;
3556 errorBelch("%s: unhandled ELF relocation(RelA) type %lu\n",
3557 oc->fileName, (lnat)ELF_R_TYPE(info));
3566 ocResolve_ELF ( ObjectCode* oc )
3570 Elf_Sym* stab = NULL;
3571 char* ehdrC = (char*)(oc->image);
3572 Elf_Ehdr* ehdr = (Elf_Ehdr*) ehdrC;
3573 Elf_Shdr* shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
3575 /* first find "the" symbol table */
3576 stab = (Elf_Sym*) findElfSection ( ehdrC, SHT_SYMTAB );
3578 /* also go find the string table */
3579 strtab = findElfSection ( ehdrC, SHT_STRTAB );
3581 if (stab == NULL || strtab == NULL) {
3582 errorBelch("%s: can't find string or symbol table", oc->fileName);
3586 /* Process the relocation sections. */
3587 for (shnum = 0; shnum < ehdr->e_shnum; shnum++) {
3588 if (shdr[shnum].sh_type == SHT_REL) {
3589 ok = do_Elf_Rel_relocations ( oc, ehdrC, shdr,
3590 shnum, stab, strtab );
3594 if (shdr[shnum].sh_type == SHT_RELA) {
3595 ok = do_Elf_Rela_relocations ( oc, ehdrC, shdr,
3596 shnum, stab, strtab );
3601 /* Free the local symbol table; we won't need it again. */
3602 freeHashTable(oc->lochash, NULL);
3605 #if defined(powerpc_HOST_ARCH)
3606 ocFlushInstructionCache( oc );
3614 * Instructions are 41 bits long, packed into 128 bit bundles with a 5-bit template
3615 * at the front. The following utility functions pack and unpack instructions, and
3616 * take care of the most common relocations.
3619 #ifdef ia64_HOST_ARCH
3622 ia64_extract_instruction(Elf64_Xword *target)
3625 int slot = (Elf_Addr)target & 3;
3626 target = (Elf_Addr)target & ~3;
3634 return ((w1 >> 5) & 0x1ffffffffff);
3636 return (w1 >> 46) | ((w2 & 0x7fffff) << 18);
3640 barf("ia64_extract_instruction: invalid slot %p", target);
3645 ia64_deposit_instruction(Elf64_Xword *target, Elf64_Xword value)
3647 int slot = (Elf_Addr)target & 3;
3648 target = (Elf_Addr)target & ~3;
3653 *target |= value << 5;
3656 *target |= value << 46;
3657 *(target+1) |= value >> 18;
3660 *(target+1) |= value << 23;
3666 ia64_reloc_gprel22(Elf_Addr target, Elf_Addr value)
3668 Elf64_Xword instruction;
3669 Elf64_Sxword rel_value;
3671 rel_value = value - gp_val;
3672 if ((rel_value > 0x1fffff) || (rel_value < -0x1fffff))
3673 barf("GP-relative data out of range (address = 0x%lx, gp = 0x%lx)", value, gp_val);
3675 instruction = ia64_extract_instruction((Elf64_Xword *)target);
3676 instruction |= (((rel_value >> 0) & 0x07f) << 13) /* imm7b */
3677 | (((rel_value >> 7) & 0x1ff) << 27) /* imm9d */
3678 | (((rel_value >> 16) & 0x01f) << 22) /* imm5c */
3679 | ((Elf64_Xword)(rel_value < 0) << 36); /* s */
3680 ia64_deposit_instruction((Elf64_Xword *)target, instruction);
3684 ia64_reloc_pcrel21(Elf_Addr target, Elf_Addr value, ObjectCode *oc)
3686 Elf64_Xword instruction;
3687 Elf64_Sxword rel_value;
3690 entry = allocatePLTEntry(value, oc);
3692 rel_value = (entry >> 4) - (target >> 4);
3693 if ((rel_value > 0xfffff) || (rel_value < -0xfffff))
3694 barf("PLT entry too far away (entry = 0x%lx, target = 0x%lx)", entry, target);
3696 instruction = ia64_extract_instruction((Elf64_Xword *)target);
3697 instruction |= ((rel_value & 0xfffff) << 13) /* imm20b */
3698 | ((Elf64_Xword)(rel_value < 0) << 36); /* s */
3699 ia64_deposit_instruction((Elf64_Xword *)target, instruction);
3705 * PowerPC ELF specifics
3708 #ifdef powerpc_HOST_ARCH
3710 static int ocAllocateJumpIslands_ELF( ObjectCode *oc )
3716 ehdr = (Elf_Ehdr *) oc->image;
3717 shdr = (Elf_Shdr *) ( ((char *)oc->image) + ehdr->e_shoff );
3719 for( i = 0; i < ehdr->e_shnum; i++ )
3720 if( shdr[i].sh_type == SHT_SYMTAB )
3723 if( i == ehdr->e_shnum )
3725 errorBelch( "This ELF file contains no symtab" );
3729 if( shdr[i].sh_entsize != sizeof( Elf_Sym ) )
3731 errorBelch( "The entry size (%d) of the symtab isn't %d\n",
3732 shdr[i].sh_entsize, sizeof( Elf_Sym ) );
3737 return ocAllocateJumpIslands( oc, shdr[i].sh_size / sizeof( Elf_Sym ), 0 );
3740 #endif /* powerpc */
3744 /* --------------------------------------------------------------------------
3746 * ------------------------------------------------------------------------*/
3748 #if defined(OBJFORMAT_MACHO)
3751 Support for MachO linking on Darwin/MacOS X
3752 by Wolfgang Thaller (wolfgang.thaller@gmx.net)
3754 I hereby formally apologize for the hackish nature of this code.
3755 Things that need to be done:
3756 *) implement ocVerifyImage_MachO
3757 *) add still more sanity checks.
3760 #ifdef powerpc_HOST_ARCH
3761 static int ocAllocateJumpIslands_MachO(ObjectCode* oc)
3763 struct mach_header *header = (struct mach_header *) oc->image;
3764 struct load_command *lc = (struct load_command *) (header + 1);
3767 for( i = 0; i < header->ncmds; i++ )
3769 if( lc->cmd == LC_SYMTAB )
3771 // Find out the first and last undefined external
3772 // symbol, so we don't have to allocate too many
3774 struct symtab_command *symLC = (struct symtab_command *) lc;
3775 unsigned min = symLC->nsyms, max = 0;
3776 struct nlist *nlist =
3777 symLC ? (struct nlist*) ((char*) oc->image + symLC->symoff)
3779 for(i=0;i<symLC->nsyms;i++)
3781 if(nlist[i].n_type & N_STAB)
3783 else if(nlist[i].n_type & N_EXT)
3785 if((nlist[i].n_type & N_TYPE) == N_UNDF
3786 && (nlist[i].n_value == 0))
3796 return ocAllocateJumpIslands(oc, max - min + 1, min);
3801 lc = (struct load_command *) ( ((char *)lc) + lc->cmdsize );
3803 return ocAllocateJumpIslands(oc,0,0);
3807 static int ocVerifyImage_MachO(ObjectCode* oc STG_UNUSED)
3809 // FIXME: do some verifying here
3813 static int resolveImports(
3816 struct symtab_command *symLC,
3817 struct section *sect, // ptr to lazy or non-lazy symbol pointer section
3818 unsigned long *indirectSyms,
3819 struct nlist *nlist)
3822 size_t itemSize = 4;
3825 int isJumpTable = 0;
3826 if(!strcmp(sect->sectname,"__jump_table"))
3830 ASSERT(sect->reserved2 == itemSize);
3834 for(i=0; i*itemSize < sect->size;i++)
3836 // according to otool, reserved1 contains the first index into the indirect symbol table
3837 struct nlist *symbol = &nlist[indirectSyms[sect->reserved1+i]];
3838 char *nm = image + symLC->stroff + symbol->n_un.n_strx;
3841 if((symbol->n_type & N_TYPE) == N_UNDF
3842 && (symbol->n_type & N_EXT) && (symbol->n_value != 0))
3843 addr = (void*) (symbol->n_value);
3844 else if((addr = lookupLocalSymbol(oc,nm)) != NULL)
3847 addr = lookupSymbol(nm);
3850 errorBelch("\n%s: unknown symbol `%s'", oc->fileName, nm);
3858 checkProddableBlock(oc,image + sect->offset + i*itemSize);
3859 *(image + sect->offset + i*itemSize) = 0xe9; // jmp
3860 *(unsigned*)(image + sect->offset + i*itemSize + 1)
3861 = (char*)addr - (image + sect->offset + i*itemSize + 5);
3866 checkProddableBlock(oc,((void**)(image + sect->offset)) + i);
3867 ((void**)(image + sect->offset))[i] = addr;
3874 static unsigned long relocateAddress(
3877 struct section* sections,
3878 unsigned long address)
3881 for(i = 0; i < nSections; i++)
3883 if(sections[i].addr <= address
3884 && address < sections[i].addr + sections[i].size)
3886 return (unsigned long)oc->image
3887 + sections[i].offset + address - sections[i].addr;
3890 barf("Invalid Mach-O file:"
3891 "Address out of bounds while relocating object file");
3895 static int relocateSection(
3898 struct symtab_command *symLC, struct nlist *nlist,
3899 int nSections, struct section* sections, struct section *sect)
3901 struct relocation_info *relocs;
3904 if(!strcmp(sect->sectname,"__la_symbol_ptr"))
3906 else if(!strcmp(sect->sectname,"__nl_symbol_ptr"))
3908 else if(!strcmp(sect->sectname,"__la_sym_ptr2"))
3910 else if(!strcmp(sect->sectname,"__la_sym_ptr3"))
3914 relocs = (struct relocation_info*) (image + sect->reloff);
3918 if(relocs[i].r_address & R_SCATTERED)
3920 struct scattered_relocation_info *scat =
3921 (struct scattered_relocation_info*) &relocs[i];
3925 if(scat->r_length == 2)
3927 unsigned long word = 0;
3928 unsigned long* wordPtr = (unsigned long*) (image + sect->offset + scat->r_address);
3929 checkProddableBlock(oc,wordPtr);
3931 // Note on relocation types:
3932 // i386 uses the GENERIC_RELOC_* types,
3933 // while ppc uses special PPC_RELOC_* types.
3934 // *_RELOC_VANILLA and *_RELOC_PAIR have the same value
3935 // in both cases, all others are different.
3936 // Therefore, we use GENERIC_RELOC_VANILLA
3937 // and GENERIC_RELOC_PAIR instead of the PPC variants,
3938 // and use #ifdefs for the other types.
3940 // Step 1: Figure out what the relocated value should be
3941 if(scat->r_type == GENERIC_RELOC_VANILLA)
3943 word = *wordPtr + (unsigned long) relocateAddress(
3950 #ifdef powerpc_HOST_ARCH
3951 else if(scat->r_type == PPC_RELOC_SECTDIFF
3952 || scat->r_type == PPC_RELOC_LO16_SECTDIFF
3953 || scat->r_type == PPC_RELOC_HI16_SECTDIFF
3954 || scat->r_type == PPC_RELOC_HA16_SECTDIFF)
3956 else if(scat->r_type == GENERIC_RELOC_SECTDIFF)
3959 struct scattered_relocation_info *pair =
3960 (struct scattered_relocation_info*) &relocs[i+1];
3962 if(!pair->r_scattered || pair->r_type != GENERIC_RELOC_PAIR)
3963 barf("Invalid Mach-O file: "
3964 "RELOC_*_SECTDIFF not followed by RELOC_PAIR");
3966 word = (unsigned long)
3967 (relocateAddress(oc, nSections, sections, scat->r_value)
3968 - relocateAddress(oc, nSections, sections, pair->r_value));
3971 #ifdef powerpc_HOST_ARCH
3972 else if(scat->r_type == PPC_RELOC_HI16
3973 || scat->r_type == PPC_RELOC_LO16
3974 || scat->r_type == PPC_RELOC_HA16
3975 || scat->r_type == PPC_RELOC_LO14)
3976 { // these are generated by label+offset things
3977 struct relocation_info *pair = &relocs[i+1];
3978 if((pair->r_address & R_SCATTERED) || pair->r_type != PPC_RELOC_PAIR)
3979 barf("Invalid Mach-O file: "
3980 "PPC_RELOC_* not followed by PPC_RELOC_PAIR");
3982 if(scat->r_type == PPC_RELOC_LO16)
3984 word = ((unsigned short*) wordPtr)[1];
3985 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
3987 else if(scat->r_type == PPC_RELOC_LO14)
3989 barf("Unsupported Relocation: PPC_RELOC_LO14");
3990 word = ((unsigned short*) wordPtr)[1] & 0xFFFC;
3991 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
3993 else if(scat->r_type == PPC_RELOC_HI16)
3995 word = ((unsigned short*) wordPtr)[1] << 16;
3996 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF);
3998 else if(scat->r_type == PPC_RELOC_HA16)
4000 word = ((unsigned short*) wordPtr)[1] << 16;
4001 word += ((short)relocs[i+1].r_address & (short)0xFFFF);
4005 word += (unsigned long) relocateAddress(oc, nSections, sections, scat->r_value)
4012 continue; // ignore the others
4014 #ifdef powerpc_HOST_ARCH
4015 if(scat->r_type == GENERIC_RELOC_VANILLA
4016 || scat->r_type == PPC_RELOC_SECTDIFF)
4018 if(scat->r_type == GENERIC_RELOC_VANILLA
4019 || scat->r_type == GENERIC_RELOC_SECTDIFF)
4024 #ifdef powerpc_HOST_ARCH
4025 else if(scat->r_type == PPC_RELOC_LO16_SECTDIFF || scat->r_type == PPC_RELOC_LO16)
4027 ((unsigned short*) wordPtr)[1] = word & 0xFFFF;
4029 else if(scat->r_type == PPC_RELOC_HI16_SECTDIFF || scat->r_type == PPC_RELOC_HI16)
4031 ((unsigned short*) wordPtr)[1] = (word >> 16) & 0xFFFF;
4033 else if(scat->r_type == PPC_RELOC_HA16_SECTDIFF || scat->r_type == PPC_RELOC_HA16)
4035 ((unsigned short*) wordPtr)[1] = ((word >> 16) & 0xFFFF)
4036 + ((word & (1<<15)) ? 1 : 0);
4042 continue; // FIXME: I hope it's OK to ignore all the others.
4046 struct relocation_info *reloc = &relocs[i];
4047 if(reloc->r_pcrel && !reloc->r_extern)
4050 if(reloc->r_length == 2)
4052 unsigned long word = 0;
4053 #ifdef powerpc_HOST_ARCH
4054 unsigned long jumpIsland = 0;
4055 long offsetToJumpIsland = 0xBADBAD42; // initialise to bad value
4056 // to avoid warning and to catch
4060 unsigned long* wordPtr = (unsigned long*) (image + sect->offset + reloc->r_address);
4061 checkProddableBlock(oc,wordPtr);
4063 if(reloc->r_type == GENERIC_RELOC_VANILLA)
4067 #ifdef powerpc_HOST_ARCH
4068 else if(reloc->r_type == PPC_RELOC_LO16)
4070 word = ((unsigned short*) wordPtr)[1];
4071 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
4073 else if(reloc->r_type == PPC_RELOC_HI16)
4075 word = ((unsigned short*) wordPtr)[1] << 16;
4076 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF);
4078 else if(reloc->r_type == PPC_RELOC_HA16)
4080 word = ((unsigned short*) wordPtr)[1] << 16;
4081 word += ((short)relocs[i+1].r_address & (short)0xFFFF);
4083 else if(reloc->r_type == PPC_RELOC_BR24)
4086 word = (word & 0x03FFFFFC) | ((word & 0x02000000) ? 0xFC000000 : 0);
4090 if(!reloc->r_extern)
4093 sections[reloc->r_symbolnum-1].offset
4094 - sections[reloc->r_symbolnum-1].addr
4101 struct nlist *symbol = &nlist[reloc->r_symbolnum];
4102 char *nm = image + symLC->stroff + symbol->n_un.n_strx;
4103 void *symbolAddress = lookupSymbol(nm);
4106 errorBelch("\nunknown symbol `%s'", nm);
4112 #ifdef powerpc_HOST_ARCH
4113 // In the .o file, this should be a relative jump to NULL
4114 // and we'll change it to a relative jump to the symbol
4115 ASSERT(-word == reloc->r_address);
4116 jumpIsland = makeJumpIsland(oc,reloc->r_symbolnum,(unsigned long) symbolAddress);
4119 offsetToJumpIsland = word + jumpIsland
4120 - (((long)image) + sect->offset - sect->addr);
4123 word += (unsigned long) symbolAddress
4124 - (((long)image) + sect->offset - sect->addr);
4128 word += (unsigned long) symbolAddress;
4132 if(reloc->r_type == GENERIC_RELOC_VANILLA)
4137 #ifdef powerpc_HOST_ARCH
4138 else if(reloc->r_type == PPC_RELOC_LO16)
4140 ((unsigned short*) wordPtr)[1] = word & 0xFFFF;
4143 else if(reloc->r_type == PPC_RELOC_HI16)
4145 ((unsigned short*) wordPtr)[1] = (word >> 16) & 0xFFFF;
4148 else if(reloc->r_type == PPC_RELOC_HA16)
4150 ((unsigned short*) wordPtr)[1] = ((word >> 16) & 0xFFFF)
4151 + ((word & (1<<15)) ? 1 : 0);
4154 else if(reloc->r_type == PPC_RELOC_BR24)
4156 if((long)word > (long)0x01FFFFFF || (long)word < (long)0xFFE00000)
4158 // The branch offset is too large.
4159 // Therefore, we try to use a jump island.
4162 barf("unconditional relative branch out of range: "
4163 "no jump island available");
4166 word = offsetToJumpIsland;
4167 if((long)word > (long)0x01FFFFFF || (long)word < (long)0xFFE00000)
4168 barf("unconditional relative branch out of range: "
4169 "jump island out of range");
4171 *wordPtr = (*wordPtr & 0xFC000003) | (word & 0x03FFFFFC);
4176 barf("\nunknown relocation %d",reloc->r_type);
4183 static int ocGetNames_MachO(ObjectCode* oc)
4185 char *image = (char*) oc->image;
4186 struct mach_header *header = (struct mach_header*) image;
4187 struct load_command *lc = (struct load_command*) (image + sizeof(struct mach_header));
4188 unsigned i,curSymbol = 0;
4189 struct segment_command *segLC = NULL;
4190 struct section *sections;
4191 struct symtab_command *symLC = NULL;
4192 struct nlist *nlist;
4193 unsigned long commonSize = 0;
4194 char *commonStorage = NULL;
4195 unsigned long commonCounter;
4197 for(i=0;i<header->ncmds;i++)
4199 if(lc->cmd == LC_SEGMENT)
4200 segLC = (struct segment_command*) lc;
4201 else if(lc->cmd == LC_SYMTAB)
4202 symLC = (struct symtab_command*) lc;
4203 lc = (struct load_command *) ( ((char*)lc) + lc->cmdsize );
4206 sections = (struct section*) (segLC+1);
4207 nlist = symLC ? (struct nlist*) (image + symLC->symoff)
4210 for(i=0;i<segLC->nsects;i++)
4212 if(sections[i].size == 0)
4215 if((sections[i].flags & SECTION_TYPE) == S_ZEROFILL)
4217 char * zeroFillArea = stgCallocBytes(1,sections[i].size,
4218 "ocGetNames_MachO(common symbols)");
4219 sections[i].offset = zeroFillArea - image;
4222 if(!strcmp(sections[i].sectname,"__text"))
4223 addSection(oc, SECTIONKIND_CODE_OR_RODATA,
4224 (void*) (image + sections[i].offset),
4225 (void*) (image + sections[i].offset + sections[i].size));
4226 else if(!strcmp(sections[i].sectname,"__const"))
4227 addSection(oc, SECTIONKIND_RWDATA,
4228 (void*) (image + sections[i].offset),
4229 (void*) (image + sections[i].offset + sections[i].size));
4230 else if(!strcmp(sections[i].sectname,"__data"))
4231 addSection(oc, SECTIONKIND_RWDATA,
4232 (void*) (image + sections[i].offset),
4233 (void*) (image + sections[i].offset + sections[i].size));
4234 else if(!strcmp(sections[i].sectname,"__bss")
4235 || !strcmp(sections[i].sectname,"__common"))
4236 addSection(oc, SECTIONKIND_RWDATA,
4237 (void*) (image + sections[i].offset),
4238 (void*) (image + sections[i].offset + sections[i].size));
4240 addProddableBlock(oc, (void*) (image + sections[i].offset),
4244 // count external symbols defined here
4248 for(i=0;i<symLC->nsyms;i++)
4250 if(nlist[i].n_type & N_STAB)
4252 else if(nlist[i].n_type & N_EXT)
4254 if((nlist[i].n_type & N_TYPE) == N_UNDF
4255 && (nlist[i].n_value != 0))
4257 commonSize += nlist[i].n_value;
4260 else if((nlist[i].n_type & N_TYPE) == N_SECT)
4265 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
4266 "ocGetNames_MachO(oc->symbols)");
4270 for(i=0;i<symLC->nsyms;i++)
4272 if(nlist[i].n_type & N_STAB)
4274 else if((nlist[i].n_type & N_TYPE) == N_SECT)
4276 if(nlist[i].n_type & N_EXT)
4278 char *nm = image + symLC->stroff + nlist[i].n_un.n_strx;
4279 ghciInsertStrHashTable(oc->fileName, symhash, nm,
4281 + sections[nlist[i].n_sect-1].offset
4282 - sections[nlist[i].n_sect-1].addr
4283 + nlist[i].n_value);
4284 oc->symbols[curSymbol++] = nm;
4288 char *nm = image + symLC->stroff + nlist[i].n_un.n_strx;
4289 ghciInsertStrHashTable(oc->fileName, oc->lochash, nm,
4291 + sections[nlist[i].n_sect-1].offset
4292 - sections[nlist[i].n_sect-1].addr
4293 + nlist[i].n_value);
4299 commonStorage = stgCallocBytes(1,commonSize,"ocGetNames_MachO(common symbols)");
4300 commonCounter = (unsigned long)commonStorage;
4303 for(i=0;i<symLC->nsyms;i++)
4305 if((nlist[i].n_type & N_TYPE) == N_UNDF
4306 && (nlist[i].n_type & N_EXT) && (nlist[i].n_value != 0))
4308 char *nm = image + symLC->stroff + nlist[i].n_un.n_strx;
4309 unsigned long sz = nlist[i].n_value;
4311 nlist[i].n_value = commonCounter;
4313 ghciInsertStrHashTable(oc->fileName, symhash, nm,
4314 (void*)commonCounter);
4315 oc->symbols[curSymbol++] = nm;
4317 commonCounter += sz;
4324 static int ocResolve_MachO(ObjectCode* oc)
4326 char *image = (char*) oc->image;
4327 struct mach_header *header = (struct mach_header*) image;
4328 struct load_command *lc = (struct load_command*) (image + sizeof(struct mach_header));
4330 struct segment_command *segLC = NULL;
4331 struct section *sections;
4332 struct symtab_command *symLC = NULL;
4333 struct dysymtab_command *dsymLC = NULL;
4334 struct nlist *nlist;
4336 for(i=0;i<header->ncmds;i++)
4338 if(lc->cmd == LC_SEGMENT)
4339 segLC = (struct segment_command*) lc;
4340 else if(lc->cmd == LC_SYMTAB)
4341 symLC = (struct symtab_command*) lc;
4342 else if(lc->cmd == LC_DYSYMTAB)
4343 dsymLC = (struct dysymtab_command*) lc;
4344 lc = (struct load_command *) ( ((char*)lc) + lc->cmdsize );
4347 sections = (struct section*) (segLC+1);
4348 nlist = symLC ? (struct nlist*) (image + symLC->symoff)
4353 unsigned long *indirectSyms
4354 = (unsigned long*) (image + dsymLC->indirectsymoff);
4356 for(i=0;i<segLC->nsects;i++)
4358 if( !strcmp(sections[i].sectname,"__la_symbol_ptr")
4359 || !strcmp(sections[i].sectname,"__la_sym_ptr2")
4360 || !strcmp(sections[i].sectname,"__la_sym_ptr3"))
4362 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4365 else if(!strcmp(sections[i].sectname,"__nl_symbol_ptr")
4366 || !strcmp(sections[i].sectname,"__pointers"))
4368 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4371 else if(!strcmp(sections[i].sectname,"__jump_table"))
4373 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4379 for(i=0;i<segLC->nsects;i++)
4381 if(!relocateSection(oc,image,symLC,nlist,segLC->nsects,sections,§ions[i]))
4385 /* Free the local symbol table; we won't need it again. */
4386 freeHashTable(oc->lochash, NULL);
4389 #if defined (powerpc_HOST_ARCH)
4390 ocFlushInstructionCache( oc );
4396 #ifdef powerpc_HOST_ARCH
4398 * The Mach-O object format uses leading underscores. But not everywhere.
4399 * There is a small number of runtime support functions defined in
4400 * libcc_dynamic.a whose name does not have a leading underscore.
4401 * As a consequence, we can't get their address from C code.
4402 * We have to use inline assembler just to take the address of a function.
4406 static void machoInitSymbolsWithoutUnderscore()
4408 extern void* symbolsWithoutUnderscore[];
4409 void **p = symbolsWithoutUnderscore;
4410 __asm__ volatile(".globl _symbolsWithoutUnderscore\n.data\n_symbolsWithoutUnderscore:");
4414 __asm__ volatile(".long " # x);
4416 RTS_MACHO_NOUNDERLINE_SYMBOLS
4418 __asm__ volatile(".text");
4422 ghciInsertStrHashTable("(GHCi built-in symbols)", symhash, #x, *p++);
4424 RTS_MACHO_NOUNDERLINE_SYMBOLS
4431 * Figure out by how much to shift the entire Mach-O file in memory
4432 * when loading so that its single segment ends up 16-byte-aligned
4434 static int machoGetMisalignment( FILE * f )
4436 struct mach_header header;
4439 fread(&header, sizeof(header), 1, f);
4442 if(header.magic != MH_MAGIC)
4445 misalignment = (header.sizeofcmds + sizeof(header))
4448 return misalignment ? (16 - misalignment) : 0;