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"
30 #include "RtsTypeable.h"
32 #ifdef HAVE_SYS_TYPES_H
33 #include <sys/types.h>
39 #ifdef HAVE_SYS_STAT_H
43 #if defined(HAVE_DLFCN_H)
47 #if defined(cygwin32_HOST_OS)
52 #ifdef HAVE_SYS_TIME_H
56 #include <sys/fcntl.h>
57 #include <sys/termios.h>
58 #include <sys/utime.h>
59 #include <sys/utsname.h>
63 #if defined(ia64_HOST_ARCH) || defined(openbsd_HOST_OS) || defined(linux_HOST_OS) || defined(freebsd_HOST_OS)
68 #if defined(openbsd_HOST_OS) || defined(linux_HOST_OS) || defined(freebsd_HOST_OS)
76 #if defined(linux_HOST_OS) || defined(solaris2_HOST_OS) || defined(freebsd_HOST_OS) || defined(netbsd_HOST_OS) || defined(openbsd_HOST_OS)
77 # define OBJFORMAT_ELF
78 #elif defined(cygwin32_HOST_OS) || defined (mingw32_HOST_OS)
79 # define OBJFORMAT_PEi386
82 #elif defined(darwin_HOST_OS)
83 # define OBJFORMAT_MACHO
84 # include <mach-o/loader.h>
85 # include <mach-o/nlist.h>
86 # include <mach-o/reloc.h>
87 # include <mach-o/dyld.h>
88 #if defined(powerpc_HOST_ARCH)
89 # include <mach-o/ppc/reloc.h>
93 /* Hash table mapping symbol names to Symbol */
94 static /*Str*/HashTable *symhash;
100 /* Hash table mapping symbol names to StgStablePtr */
101 static /*Str*/HashTable *stablehash;
102 rootEntry *root_ptr_table = NULL;
103 static rootEntry *root_ptr_free = NULL;
105 static unsigned int RPT_size = 0;
107 /* List of currently loaded objects */
108 ObjectCode *objects = NULL; /* initially empty */
110 #if defined(OBJFORMAT_ELF)
111 static int ocVerifyImage_ELF ( ObjectCode* oc );
112 static int ocGetNames_ELF ( ObjectCode* oc );
113 static int ocResolve_ELF ( ObjectCode* oc );
114 #if defined(powerpc_HOST_ARCH)
115 static int ocAllocateJumpIslands_ELF ( ObjectCode* oc );
117 #elif defined(OBJFORMAT_PEi386)
118 static int ocVerifyImage_PEi386 ( ObjectCode* oc );
119 static int ocGetNames_PEi386 ( ObjectCode* oc );
120 static int ocResolve_PEi386 ( ObjectCode* oc );
121 #elif defined(OBJFORMAT_MACHO)
122 static int ocVerifyImage_MachO ( ObjectCode* oc );
123 static int ocGetNames_MachO ( ObjectCode* oc );
124 static int ocResolve_MachO ( ObjectCode* oc );
126 static int machoGetMisalignment( FILE * );
127 #ifdef powerpc_HOST_ARCH
128 static int ocAllocateJumpIslands_MachO ( ObjectCode* oc );
129 static void machoInitSymbolsWithoutUnderscore( void );
133 #if defined(x86_64_HOST_ARCH)
134 static void*x86_64_high_symbol( char *lbl, void *addr );
137 /* -----------------------------------------------------------------------------
138 * Built-in symbols from the RTS
141 typedef struct _RtsSymbolVal {
148 #define Maybe_Stable_Names SymX(mkWeakzh_fast) \
149 SymX(makeStableNamezh_fast) \
150 SymX(finalizzeWeakzh_fast)
152 /* These are not available in GUM!!! -- HWL */
153 #define Maybe_Stable_Names
156 #if !defined (mingw32_HOST_OS)
157 #define RTS_POSIX_ONLY_SYMBOLS \
158 SymX(signal_handlers) \
159 SymX(stg_sig_install) \
163 #if defined (cygwin32_HOST_OS)
164 #define RTS_MINGW_ONLY_SYMBOLS /**/
165 /* Don't have the ability to read import libs / archives, so
166 * we have to stupidly list a lot of what libcygwin.a
169 #define RTS_CYGWIN_ONLY_SYMBOLS \
247 #elif !defined(mingw32_HOST_OS)
248 #define RTS_MINGW_ONLY_SYMBOLS /**/
249 #define RTS_CYGWIN_ONLY_SYMBOLS /**/
250 #else /* defined(mingw32_HOST_OS) */
251 #define RTS_POSIX_ONLY_SYMBOLS /**/
252 #define RTS_CYGWIN_ONLY_SYMBOLS /**/
254 /* Extra syms gen'ed by mingw-2's gcc-3.2: */
256 #define RTS_MINGW_EXTRA_SYMS \
257 Sym(_imp____mb_cur_max) \
260 #define RTS_MINGW_EXTRA_SYMS
263 /* These are statically linked from the mingw libraries into the ghc
264 executable, so we have to employ this hack. */
265 #define RTS_MINGW_ONLY_SYMBOLS \
266 SymX(asyncReadzh_fast) \
267 SymX(asyncWritezh_fast) \
268 SymX(asyncDoProczh_fast) \
280 SymX(getservbyname) \
281 SymX(getservbyport) \
282 SymX(getprotobynumber) \
283 SymX(getprotobyname) \
284 SymX(gethostbyname) \
285 SymX(gethostbyaddr) \
332 SymX(rts_InstallConsoleEvent) \
333 SymX(rts_ConsoleHandlerDone) \
335 Sym(_imp___timezone) \
345 RTS_MINGW_EXTRA_SYMS \
349 #if defined(darwin_TARGET_OS) && HAVE_PRINTF_LDBLSTUB
350 #define RTS_DARWIN_ONLY_SYMBOLS \
351 Sym(asprintf$LDBLStub) \
355 Sym(fprintf$LDBLStub) \
356 Sym(fscanf$LDBLStub) \
357 Sym(fwprintf$LDBLStub) \
358 Sym(fwscanf$LDBLStub) \
359 Sym(printf$LDBLStub) \
360 Sym(scanf$LDBLStub) \
361 Sym(snprintf$LDBLStub) \
362 Sym(sprintf$LDBLStub) \
363 Sym(sscanf$LDBLStub) \
364 Sym(strtold$LDBLStub) \
365 Sym(swprintf$LDBLStub) \
366 Sym(swscanf$LDBLStub) \
367 Sym(syslog$LDBLStub) \
368 Sym(vasprintf$LDBLStub) \
370 Sym(verrc$LDBLStub) \
371 Sym(verrx$LDBLStub) \
372 Sym(vfprintf$LDBLStub) \
373 Sym(vfscanf$LDBLStub) \
374 Sym(vfwprintf$LDBLStub) \
375 Sym(vfwscanf$LDBLStub) \
376 Sym(vprintf$LDBLStub) \
377 Sym(vscanf$LDBLStub) \
378 Sym(vsnprintf$LDBLStub) \
379 Sym(vsprintf$LDBLStub) \
380 Sym(vsscanf$LDBLStub) \
381 Sym(vswprintf$LDBLStub) \
382 Sym(vswscanf$LDBLStub) \
383 Sym(vsyslog$LDBLStub) \
384 Sym(vwarn$LDBLStub) \
385 Sym(vwarnc$LDBLStub) \
386 Sym(vwarnx$LDBLStub) \
387 Sym(vwprintf$LDBLStub) \
388 Sym(vwscanf$LDBLStub) \
390 Sym(warnc$LDBLStub) \
391 Sym(warnx$LDBLStub) \
392 Sym(wcstold$LDBLStub) \
393 Sym(wprintf$LDBLStub) \
396 #define RTS_DARWIN_ONLY_SYMBOLS
400 # define MAIN_CAP_SYM SymX(MainCapability)
402 # define MAIN_CAP_SYM
405 #if !defined(mingw32_HOST_OS)
406 #define RTS_USER_SIGNALS_SYMBOLS \
407 SymX(setIOManagerPipe)
409 #define RTS_USER_SIGNALS_SYMBOLS /* nothing */
412 #ifdef TABLES_NEXT_TO_CODE
413 #define RTS_RET_SYMBOLS /* nothing */
415 #define RTS_RET_SYMBOLS \
416 SymX(stg_enter_ret) \
417 SymX(stg_gc_fun_ret) \
424 SymX(stg_ap_pv_ret) \
425 SymX(stg_ap_pp_ret) \
426 SymX(stg_ap_ppv_ret) \
427 SymX(stg_ap_ppp_ret) \
428 SymX(stg_ap_pppv_ret) \
429 SymX(stg_ap_pppp_ret) \
430 SymX(stg_ap_ppppp_ret) \
431 SymX(stg_ap_pppppp_ret)
434 #define RTS_SYMBOLS \
437 SymX(stg_enter_info) \
438 SymX(stg_gc_void_info) \
439 SymX(__stg_gc_enter_1) \
440 SymX(stg_gc_noregs) \
441 SymX(stg_gc_unpt_r1_info) \
442 SymX(stg_gc_unpt_r1) \
443 SymX(stg_gc_unbx_r1_info) \
444 SymX(stg_gc_unbx_r1) \
445 SymX(stg_gc_f1_info) \
447 SymX(stg_gc_d1_info) \
449 SymX(stg_gc_l1_info) \
452 SymX(stg_gc_fun_info) \
454 SymX(stg_gc_gen_info) \
455 SymX(stg_gc_gen_hp) \
457 SymX(stg_gen_yield) \
458 SymX(stg_yield_noregs) \
459 SymX(stg_yield_to_interpreter) \
460 SymX(stg_gen_block) \
461 SymX(stg_block_noregs) \
463 SymX(stg_block_takemvar) \
464 SymX(stg_block_putmvar) \
465 SymX(stg_seq_frame_info) \
467 SymX(MallocFailHook) \
469 SymX(OutOfHeapHook) \
470 SymX(StackOverflowHook) \
471 SymX(__encodeDouble) \
472 SymX(__encodeFloat) \
476 SymX(__gmpz_cmp_si) \
477 SymX(__gmpz_cmp_ui) \
478 SymX(__gmpz_get_si) \
479 SymX(__gmpz_get_ui) \
480 SymX(__int_encodeDouble) \
481 SymX(__int_encodeFloat) \
482 SymX(andIntegerzh_fast) \
483 SymX(atomicallyzh_fast) \
487 SymX(blockAsyncExceptionszh_fast) \
489 SymX(catchRetryzh_fast) \
490 SymX(catchSTMzh_fast) \
491 SymX(closure_flags) \
493 SymX(cmpIntegerzh_fast) \
494 SymX(cmpIntegerIntzh_fast) \
495 SymX(complementIntegerzh_fast) \
496 SymX(createAdjustor) \
497 SymX(decodeDoublezh_fast) \
498 SymX(decodeFloatzh_fast) \
501 SymX(deRefWeakzh_fast) \
502 SymX(deRefStablePtrzh_fast) \
503 SymX(dirty_MUT_VAR) \
504 SymX(divExactIntegerzh_fast) \
505 SymX(divModIntegerzh_fast) \
507 SymX(forkOnzh_fast) \
509 SymX(forkOS_createThread) \
510 SymX(freeHaskellFunctionPtr) \
511 SymX(freeStablePtr) \
512 SymX(getOrSetTypeableStore) \
513 SymX(gcdIntegerzh_fast) \
514 SymX(gcdIntegerIntzh_fast) \
515 SymX(gcdIntzh_fast) \
524 SymX(hs_perform_gc) \
525 SymX(hs_free_stable_ptr) \
526 SymX(hs_free_fun_ptr) \
528 SymX(int2Integerzh_fast) \
529 SymX(integer2Intzh_fast) \
530 SymX(integer2Wordzh_fast) \
531 SymX(isCurrentThreadBoundzh_fast) \
532 SymX(isDoubleDenormalized) \
533 SymX(isDoubleInfinite) \
535 SymX(isDoubleNegativeZero) \
536 SymX(isEmptyMVarzh_fast) \
537 SymX(isFloatDenormalized) \
538 SymX(isFloatInfinite) \
540 SymX(isFloatNegativeZero) \
541 SymX(killThreadzh_fast) \
543 SymX(insertStableSymbol) \
546 SymX(makeStablePtrzh_fast) \
547 SymX(minusIntegerzh_fast) \
548 SymX(mkApUpd0zh_fast) \
549 SymX(myThreadIdzh_fast) \
550 SymX(labelThreadzh_fast) \
551 SymX(newArrayzh_fast) \
552 SymX(newBCOzh_fast) \
553 SymX(newByteArrayzh_fast) \
554 SymX_redirect(newCAF, newDynCAF) \
555 SymX(newMVarzh_fast) \
556 SymX(newMutVarzh_fast) \
557 SymX(newTVarzh_fast) \
558 SymX(atomicModifyMutVarzh_fast) \
559 SymX(newPinnedByteArrayzh_fast) \
561 SymX(orIntegerzh_fast) \
563 SymX(performMajorGC) \
564 SymX(plusIntegerzh_fast) \
567 SymX(putMVarzh_fast) \
568 SymX(quotIntegerzh_fast) \
569 SymX(quotRemIntegerzh_fast) \
571 SymX(raiseIOzh_fast) \
572 SymX(readTVarzh_fast) \
573 SymX(remIntegerzh_fast) \
574 SymX(resetNonBlockingFd) \
579 SymX(rts_checkSchedStatus) \
582 SymX(rts_evalLazyIO) \
583 SymX(rts_evalStableIO) \
587 SymX(rts_getDouble) \
592 SymX(rts_getFunPtr) \
593 SymX(rts_getStablePtr) \
594 SymX(rts_getThreadId) \
596 SymX(rts_getWord32) \
609 SymX(rts_mkStablePtr) \
617 SymX(rtsSupportsBoundThreads) \
618 SymX(__hscore_get_saved_termios) \
619 SymX(__hscore_set_saved_termios) \
621 SymX(startupHaskell) \
622 SymX(shutdownHaskell) \
623 SymX(shutdownHaskellAndExit) \
624 SymX(stable_ptr_table) \
625 SymX(stackOverflow) \
626 SymX(stg_CAF_BLACKHOLE_info) \
627 SymX(awakenBlockedQueue) \
628 SymX(stg_CHARLIKE_closure) \
629 SymX(stg_EMPTY_MVAR_info) \
630 SymX(stg_IND_STATIC_info) \
631 SymX(stg_INTLIKE_closure) \
632 SymX(stg_MUT_ARR_PTRS_DIRTY_info) \
633 SymX(stg_MUT_ARR_PTRS_FROZEN_info) \
634 SymX(stg_MUT_ARR_PTRS_FROZEN0_info) \
635 SymX(stg_WEAK_info) \
636 SymX(stg_ap_v_info) \
637 SymX(stg_ap_f_info) \
638 SymX(stg_ap_d_info) \
639 SymX(stg_ap_l_info) \
640 SymX(stg_ap_n_info) \
641 SymX(stg_ap_p_info) \
642 SymX(stg_ap_pv_info) \
643 SymX(stg_ap_pp_info) \
644 SymX(stg_ap_ppv_info) \
645 SymX(stg_ap_ppp_info) \
646 SymX(stg_ap_pppv_info) \
647 SymX(stg_ap_pppp_info) \
648 SymX(stg_ap_ppppp_info) \
649 SymX(stg_ap_pppppp_info) \
650 SymX(stg_ap_0_fast) \
651 SymX(stg_ap_v_fast) \
652 SymX(stg_ap_f_fast) \
653 SymX(stg_ap_d_fast) \
654 SymX(stg_ap_l_fast) \
655 SymX(stg_ap_n_fast) \
656 SymX(stg_ap_p_fast) \
657 SymX(stg_ap_pv_fast) \
658 SymX(stg_ap_pp_fast) \
659 SymX(stg_ap_ppv_fast) \
660 SymX(stg_ap_ppp_fast) \
661 SymX(stg_ap_pppv_fast) \
662 SymX(stg_ap_pppp_fast) \
663 SymX(stg_ap_ppppp_fast) \
664 SymX(stg_ap_pppppp_fast) \
665 SymX(stg_ap_1_upd_info) \
666 SymX(stg_ap_2_upd_info) \
667 SymX(stg_ap_3_upd_info) \
668 SymX(stg_ap_4_upd_info) \
669 SymX(stg_ap_5_upd_info) \
670 SymX(stg_ap_6_upd_info) \
671 SymX(stg_ap_7_upd_info) \
673 SymX(stg_sel_0_upd_info) \
674 SymX(stg_sel_10_upd_info) \
675 SymX(stg_sel_11_upd_info) \
676 SymX(stg_sel_12_upd_info) \
677 SymX(stg_sel_13_upd_info) \
678 SymX(stg_sel_14_upd_info) \
679 SymX(stg_sel_15_upd_info) \
680 SymX(stg_sel_1_upd_info) \
681 SymX(stg_sel_2_upd_info) \
682 SymX(stg_sel_3_upd_info) \
683 SymX(stg_sel_4_upd_info) \
684 SymX(stg_sel_5_upd_info) \
685 SymX(stg_sel_6_upd_info) \
686 SymX(stg_sel_7_upd_info) \
687 SymX(stg_sel_8_upd_info) \
688 SymX(stg_sel_9_upd_info) \
689 SymX(stg_upd_frame_info) \
690 SymX(suspendThread) \
691 SymX(takeMVarzh_fast) \
692 SymX(timesIntegerzh_fast) \
693 SymX(tryPutMVarzh_fast) \
694 SymX(tryTakeMVarzh_fast) \
695 SymX(unblockAsyncExceptionszh_fast) \
697 SymX(unsafeThawArrayzh_fast) \
698 SymX(waitReadzh_fast) \
699 SymX(waitWritezh_fast) \
700 SymX(word2Integerzh_fast) \
701 SymX(writeTVarzh_fast) \
702 SymX(xorIntegerzh_fast) \
704 SymX(stg_interp_constr_entry) \
705 SymX(stg_interp_constr1_entry) \
706 SymX(stg_interp_constr2_entry) \
707 SymX(stg_interp_constr3_entry) \
708 SymX(stg_interp_constr4_entry) \
709 SymX(stg_interp_constr5_entry) \
710 SymX(stg_interp_constr6_entry) \
711 SymX(stg_interp_constr7_entry) \
712 SymX(stg_interp_constr8_entry) \
715 SymX(getAllocations) \
718 RTS_USER_SIGNALS_SYMBOLS
720 #ifdef SUPPORT_LONG_LONGS
721 #define RTS_LONG_LONG_SYMS \
722 SymX(int64ToIntegerzh_fast) \
723 SymX(word64ToIntegerzh_fast)
725 #define RTS_LONG_LONG_SYMS /* nothing */
728 // 64-bit support functions in libgcc.a
729 #if defined(__GNUC__) && SIZEOF_VOID_P <= 4
730 #define RTS_LIBGCC_SYMBOLS \
740 #elif defined(ia64_HOST_ARCH)
741 #define RTS_LIBGCC_SYMBOLS \
749 #define RTS_LIBGCC_SYMBOLS
752 #if defined(darwin_HOST_OS) && defined(powerpc_HOST_ARCH)
753 // Symbols that don't have a leading underscore
754 // on Mac OS X. They have to receive special treatment,
755 // see machoInitSymbolsWithoutUnderscore()
756 #define RTS_MACHO_NOUNDERLINE_SYMBOLS \
761 /* entirely bogus claims about types of these symbols */
762 #define Sym(vvv) extern void vvv(void);
763 #define SymX(vvv) /**/
764 #define SymX_redirect(vvv,xxx) /**/
768 RTS_POSIX_ONLY_SYMBOLS
769 RTS_MINGW_ONLY_SYMBOLS
770 RTS_CYGWIN_ONLY_SYMBOLS
771 RTS_DARWIN_ONLY_SYMBOLS
777 #ifdef LEADING_UNDERSCORE
778 #define MAYBE_LEADING_UNDERSCORE_STR(s) ("_" s)
780 #define MAYBE_LEADING_UNDERSCORE_STR(s) (s)
783 #define Sym(vvv) { MAYBE_LEADING_UNDERSCORE_STR(#vvv), \
785 #define SymX(vvv) Sym(vvv)
787 // SymX_redirect allows us to redirect references to one symbol to
788 // another symbol. See newCAF/newDynCAF for an example.
789 #define SymX_redirect(vvv,xxx) \
790 { MAYBE_LEADING_UNDERSCORE_STR(#vvv), \
793 static RtsSymbolVal rtsSyms[] = {
797 RTS_POSIX_ONLY_SYMBOLS
798 RTS_MINGW_ONLY_SYMBOLS
799 RTS_CYGWIN_ONLY_SYMBOLS
801 #if defined(darwin_HOST_OS) && defined(i386_HOST_ARCH)
802 // dyld stub code contains references to this,
803 // but it should never be called because we treat
804 // lazy pointers as nonlazy.
805 { "dyld_stub_binding_helper", (void*)0xDEADBEEF },
807 { 0, 0 } /* sentinel */
811 /* -----------------------------------------------------------------------------
812 * Utilities for handling root pointers.
813 * -------------------------------------------------------------------------- */
816 #define INIT_RPT_SIZE 64
819 initFreeList(rootEntry *table, nat n, rootEntry *free)
823 for (p = table + n - 1; p >= table; p--) {
827 root_ptr_free = table;
831 initRootPtrTable(void)
836 RPT_size = INIT_RPT_SIZE;
837 root_ptr_table = stgMallocBytes(RPT_size * sizeof(rootEntry),
840 initFreeList(root_ptr_table,INIT_RPT_SIZE,NULL);
845 enlargeRootPtrTable(void)
847 nat old_RPT_size = RPT_size;
849 // 2nd and subsequent times
852 stgReallocBytes(root_ptr_table,
853 RPT_size * sizeof(rootEntry),
854 "enlargeRootPtrTable");
856 initFreeList(root_ptr_table + old_RPT_size, old_RPT_size, NULL);
860 addRootObject(void *addr)
864 if (root_ptr_free == NULL) {
865 enlargeRootPtrTable();
868 rt = root_ptr_free - root_ptr_table;
869 root_ptr_free = (rootEntry*)(root_ptr_free->addr);
870 root_ptr_table[rt].addr = addr;
873 /* -----------------------------------------------------------------------------
874 * Treat root pointers as roots for the garbage collector.
875 * -------------------------------------------------------------------------- */
878 markRootPtrTable(evac_fn evac)
880 rootEntry *p, *end_root_ptr_table;
883 end_root_ptr_table = &root_ptr_table[RPT_size];
885 for (p = root_ptr_table; p < end_root_ptr_table; p++) {
888 if (q && (q < (P_)root_ptr_table || q >= (P_)end_root_ptr_table)) {
889 evac((StgClosure **)p->addr);
894 /* -----------------------------------------------------------------------------
895 * End of utilities for handling root pointers.
896 * -------------------------------------------------------------------------- */
899 /* -----------------------------------------------------------------------------
900 * Insert symbols into hash tables, checking for duplicates.
902 static void ghciInsertStrHashTable ( char* obj_name,
908 if (lookupHashTable(table, (StgWord)key) == NULL)
910 insertStrHashTable(table, (StgWord)key, data);
915 "GHCi runtime linker: fatal error: I found a duplicate definition for symbol\n"
917 "whilst processing object file\n"
919 "This could be caused by:\n"
920 " * Loading two different object files which export the same symbol\n"
921 " * Specifying the same object file twice on the GHCi command line\n"
922 " * An incorrect `package.conf' entry, causing some object to be\n"
924 "GHCi cannot safely continue in this situation. Exiting now. Sorry.\n"
933 /* -----------------------------------------------------------------------------
934 * initialize the object linker
938 static int linker_init_done = 0 ;
940 #if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
941 static void *dl_prog_handle;
944 /* dlopen(NULL,..) doesn't work so we grab libc explicitly */
945 #if defined(openbsd_HOST_OS)
946 static void *dl_libc_handle;
954 /* Make initLinker idempotent, so we can call it
955 before evey relevant operation; that means we
956 don't need to initialise the linker separately */
957 if (linker_init_done == 1) { return; } else {
958 linker_init_done = 1;
961 stablehash = allocStrHashTable();
962 symhash = allocStrHashTable();
964 /* populate the symbol table with stuff from the RTS */
965 for (sym = rtsSyms; sym->lbl != NULL; sym++) {
966 ghciInsertStrHashTable("(GHCi built-in symbols)",
967 symhash, sym->lbl, sym->addr);
969 # if defined(OBJFORMAT_MACHO) && defined(powerpc_HOST_ARCH)
970 machoInitSymbolsWithoutUnderscore();
973 # if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
974 # if defined(RTLD_DEFAULT)
975 dl_prog_handle = RTLD_DEFAULT;
977 dl_prog_handle = dlopen(NULL, RTLD_LAZY);
978 # if defined(openbsd_HOST_OS)
979 dl_libc_handle = dlopen("libc.so", RTLD_LAZY);
981 # endif /* RTLD_DEFAULT */
985 /* -----------------------------------------------------------------------------
986 * Loading DLL or .so dynamic libraries
987 * -----------------------------------------------------------------------------
989 * Add a DLL from which symbols may be found. In the ELF case, just
990 * do RTLD_GLOBAL-style add, so no further messing around needs to
991 * happen in order that symbols in the loaded .so are findable --
992 * lookupSymbol() will subsequently see them by dlsym on the program's
993 * dl-handle. Returns NULL if success, otherwise ptr to an err msg.
995 * In the PEi386 case, open the DLLs and put handles to them in a
996 * linked list. When looking for a symbol, try all handles in the
997 * list. This means that we need to load even DLLs that are guaranteed
998 * to be in the ghc.exe image already, just so we can get a handle
999 * to give to loadSymbol, so that we can find the symbols. For such
1000 * libraries, the LoadLibrary call should be a no-op except for returning
1005 #if defined(OBJFORMAT_PEi386)
1006 /* A record for storing handles into DLLs. */
1011 struct _OpenedDLL* next;
1016 /* A list thereof. */
1017 static OpenedDLL* opened_dlls = NULL;
1021 addDLL( char *dll_name )
1023 # if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
1024 /* ------------------- ELF DLL loader ------------------- */
1030 hdl= dlopen(dll_name, RTLD_NOW | RTLD_GLOBAL);
1033 /* dlopen failed; return a ptr to the error msg. */
1035 if (errmsg == NULL) errmsg = "addDLL: unknown error";
1042 # elif defined(OBJFORMAT_PEi386)
1043 /* ------------------- Win32 DLL loader ------------------- */
1051 /* debugBelch("\naddDLL; dll_name = `%s'\n", dll_name); */
1053 /* See if we've already got it, and ignore if so. */
1054 for (o_dll = opened_dlls; o_dll != NULL; o_dll = o_dll->next) {
1055 if (0 == strcmp(o_dll->name, dll_name))
1059 /* The file name has no suffix (yet) so that we can try
1060 both foo.dll and foo.drv
1062 The documentation for LoadLibrary says:
1063 If no file name extension is specified in the lpFileName
1064 parameter, the default library extension .dll is
1065 appended. However, the file name string can include a trailing
1066 point character (.) to indicate that the module name has no
1069 buf = stgMallocBytes(strlen(dll_name) + 10, "addDLL");
1070 sprintf(buf, "%s.DLL", dll_name);
1071 instance = LoadLibrary(buf);
1072 if (instance == NULL) {
1073 sprintf(buf, "%s.DRV", dll_name); // KAA: allow loading of drivers (like winspool.drv)
1074 instance = LoadLibrary(buf);
1075 if (instance == NULL) {
1078 /* LoadLibrary failed; return a ptr to the error msg. */
1079 return "addDLL: unknown error";
1084 /* Add this DLL to the list of DLLs in which to search for symbols. */
1085 o_dll = stgMallocBytes( sizeof(OpenedDLL), "addDLL" );
1086 o_dll->name = stgMallocBytes(1+strlen(dll_name), "addDLL");
1087 strcpy(o_dll->name, dll_name);
1088 o_dll->instance = instance;
1089 o_dll->next = opened_dlls;
1090 opened_dlls = o_dll;
1094 barf("addDLL: not implemented on this platform");
1098 /* -----------------------------------------------------------------------------
1099 * insert a stable symbol in the hash table
1103 insertStableSymbol(char* obj_name, char* key, StgPtr p)
1105 ghciInsertStrHashTable(obj_name, stablehash, key, getStablePtr(p));
1109 /* -----------------------------------------------------------------------------
1110 * insert a symbol in the hash table
1113 insertSymbol(char* obj_name, char* key, void* data)
1115 ghciInsertStrHashTable(obj_name, symhash, key, data);
1118 /* -----------------------------------------------------------------------------
1119 * lookup a symbol in the hash table
1122 lookupSymbol( char *lbl )
1126 ASSERT(symhash != NULL);
1127 val = lookupStrHashTable(symhash, lbl);
1130 # if defined(OBJFORMAT_ELF)
1131 # if defined(openbsd_HOST_OS)
1132 val = dlsym(dl_prog_handle, lbl);
1133 return (val != NULL) ? val : dlsym(dl_libc_handle,lbl);
1134 # elif defined(x86_64_HOST_ARCH)
1135 val = dlsym(dl_prog_handle, lbl);
1136 if (val >= (void *)0x80000000) {
1138 new_val = x86_64_high_symbol(lbl, val);
1139 IF_DEBUG(linker,debugBelch("lookupSymbol: relocating out of range symbol: %s = %p, now %p\n", lbl, val, new_val));
1144 # else /* not openbsd */
1145 return dlsym(dl_prog_handle, lbl);
1147 # elif defined(OBJFORMAT_MACHO)
1148 if(NSIsSymbolNameDefined(lbl)) {
1149 NSSymbol symbol = NSLookupAndBindSymbol(lbl);
1150 return NSAddressOfSymbol(symbol);
1154 # elif defined(OBJFORMAT_PEi386)
1157 for (o_dll = opened_dlls; o_dll != NULL; o_dll = o_dll->next) {
1158 /* debugBelch("look in %s for %s\n", o_dll->name, lbl); */
1159 if (lbl[0] == '_') {
1160 /* HACK: if the name has an initial underscore, try stripping
1161 it off & look that up first. I've yet to verify whether there's
1162 a Rule that governs whether an initial '_' *should always* be
1163 stripped off when mapping from import lib name to the DLL name.
1165 sym = GetProcAddress(o_dll->instance, (lbl+1));
1167 /*debugBelch("found %s in %s\n", lbl+1,o_dll->name);*/
1171 sym = GetProcAddress(o_dll->instance, lbl);
1173 /*debugBelch("found %s in %s\n", lbl,o_dll->name);*/
1188 __attribute((unused))
1190 lookupLocalSymbol( ObjectCode* oc, char *lbl )
1194 val = lookupStrHashTable(oc->lochash, lbl);
1204 /* -----------------------------------------------------------------------------
1205 * Debugging aid: look in GHCi's object symbol tables for symbols
1206 * within DELTA bytes of the specified address, and show their names.
1209 void ghci_enquire ( char* addr );
1211 void ghci_enquire ( char* addr )
1216 const int DELTA = 64;
1221 for (oc = objects; oc; oc = oc->next) {
1222 for (i = 0; i < oc->n_symbols; i++) {
1223 sym = oc->symbols[i];
1224 if (sym == NULL) continue;
1225 // debugBelch("enquire %p %p\n", sym, oc->lochash);
1227 if (oc->lochash != NULL) {
1228 a = lookupStrHashTable(oc->lochash, sym);
1231 a = lookupStrHashTable(symhash, sym);
1234 // debugBelch("ghci_enquire: can't find %s\n", sym);
1236 else if (addr-DELTA <= a && a <= addr+DELTA) {
1237 debugBelch("%p + %3d == `%s'\n", addr, (int)(a - addr), sym);
1244 #ifdef ia64_HOST_ARCH
1245 static unsigned int PLTSize(void);
1248 /* -----------------------------------------------------------------------------
1249 * Load an obj (populate the global symbol table, but don't resolve yet)
1251 * Returns: 1 if ok, 0 on error.
1254 loadObj( char *path )
1261 void *map_addr = NULL;
1268 /* debugBelch("loadObj %s\n", path ); */
1270 /* Check that we haven't already loaded this object.
1271 Ignore requests to load multiple times */
1275 for (o = objects; o; o = o->next) {
1276 if (0 == strcmp(o->fileName, path)) {
1278 break; /* don't need to search further */
1282 IF_DEBUG(linker, debugBelch(
1283 "GHCi runtime linker: warning: looks like you're trying to load the\n"
1284 "same object file twice:\n"
1286 "GHCi will ignore this, but be warned.\n"
1288 return 1; /* success */
1292 oc = stgMallocBytes(sizeof(ObjectCode), "loadObj(oc)");
1294 # if defined(OBJFORMAT_ELF)
1295 oc->formatName = "ELF";
1296 # elif defined(OBJFORMAT_PEi386)
1297 oc->formatName = "PEi386";
1298 # elif defined(OBJFORMAT_MACHO)
1299 oc->formatName = "Mach-O";
1302 barf("loadObj: not implemented on this platform");
1305 r = stat(path, &st);
1306 if (r == -1) { return 0; }
1308 /* sigh, strdup() isn't a POSIX function, so do it the long way */
1309 oc->fileName = stgMallocBytes( strlen(path)+1, "loadObj" );
1310 strcpy(oc->fileName, path);
1312 oc->fileSize = st.st_size;
1314 oc->sections = NULL;
1315 oc->lochash = allocStrHashTable();
1316 oc->proddables = NULL;
1318 /* chain it onto the list of objects */
1323 #define ROUND_UP(x,size) ((x + size - 1) & ~(size - 1))
1325 /* On many architectures malloc'd memory isn't executable, so we need to use mmap. */
1327 #if defined(openbsd_HOST_OS)
1328 fd = open(path, O_RDONLY, S_IRUSR);
1330 fd = open(path, O_RDONLY);
1333 barf("loadObj: can't open `%s'", path);
1335 pagesize = getpagesize();
1337 #ifdef ia64_HOST_ARCH
1338 /* The PLT needs to be right before the object */
1339 n = ROUND_UP(PLTSize(), pagesize);
1340 oc->plt = mmap(NULL, n, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
1341 if (oc->plt == MAP_FAILED)
1342 barf("loadObj: can't allocate PLT");
1345 map_addr = oc->plt + n;
1348 n = ROUND_UP(oc->fileSize, pagesize);
1350 /* Link objects into the lower 2Gb on x86_64. GHC assumes the
1351 * small memory model on this architecture (see gcc docs,
1354 #ifdef x86_64_HOST_ARCH
1355 #define EXTRA_MAP_FLAGS MAP_32BIT
1357 #define EXTRA_MAP_FLAGS 0
1360 oc->image = mmap(map_addr, n, PROT_EXEC|PROT_READ|PROT_WRITE,
1361 MAP_PRIVATE|EXTRA_MAP_FLAGS, fd, 0);
1362 if (oc->image == MAP_FAILED)
1363 barf("loadObj: can't map `%s'", path);
1367 #else /* !USE_MMAP */
1369 /* load the image into memory */
1370 f = fopen(path, "rb");
1372 barf("loadObj: can't read `%s'", path);
1374 #ifdef darwin_HOST_OS
1375 // In a Mach-O .o file, all sections can and will be misaligned
1376 // if the total size of the headers is not a multiple of the
1377 // desired alignment. This is fine for .o files that only serve
1378 // as input for the static linker, but it's not fine for us,
1379 // as SSE (used by gcc for floating point) and Altivec require
1380 // 16-byte alignment.
1381 // We calculate the correct alignment from the header before
1382 // reading the file, and then we misalign oc->image on purpose so
1383 // that the actual sections end up aligned again.
1384 misalignment = machoGetMisalignment(f);
1385 oc->misalignment = misalignment;
1390 oc->image = stgMallocBytes(oc->fileSize + misalignment, "loadObj(image)");
1391 oc->image += misalignment;
1393 n = fread ( oc->image, 1, oc->fileSize, f );
1394 if (n != oc->fileSize)
1395 barf("loadObj: error whilst reading `%s'", path);
1399 #endif /* USE_MMAP */
1401 # if defined(OBJFORMAT_MACHO) && defined(powerpc_HOST_ARCH)
1402 r = ocAllocateJumpIslands_MachO ( oc );
1403 if (!r) { return r; }
1404 # elif defined(OBJFORMAT_ELF) && defined(powerpc_HOST_ARCH)
1405 r = ocAllocateJumpIslands_ELF ( oc );
1406 if (!r) { return r; }
1409 /* verify the in-memory image */
1410 # if defined(OBJFORMAT_ELF)
1411 r = ocVerifyImage_ELF ( oc );
1412 # elif defined(OBJFORMAT_PEi386)
1413 r = ocVerifyImage_PEi386 ( oc );
1414 # elif defined(OBJFORMAT_MACHO)
1415 r = ocVerifyImage_MachO ( oc );
1417 barf("loadObj: no verify method");
1419 if (!r) { return r; }
1421 /* build the symbol list for this image */
1422 # if defined(OBJFORMAT_ELF)
1423 r = ocGetNames_ELF ( oc );
1424 # elif defined(OBJFORMAT_PEi386)
1425 r = ocGetNames_PEi386 ( oc );
1426 # elif defined(OBJFORMAT_MACHO)
1427 r = ocGetNames_MachO ( oc );
1429 barf("loadObj: no getNames method");
1431 if (!r) { return r; }
1433 /* loaded, but not resolved yet */
1434 oc->status = OBJECT_LOADED;
1439 /* -----------------------------------------------------------------------------
1440 * resolve all the currently unlinked objects in memory
1442 * Returns: 1 if ok, 0 on error.
1452 for (oc = objects; oc; oc = oc->next) {
1453 if (oc->status != OBJECT_RESOLVED) {
1454 # if defined(OBJFORMAT_ELF)
1455 r = ocResolve_ELF ( oc );
1456 # elif defined(OBJFORMAT_PEi386)
1457 r = ocResolve_PEi386 ( oc );
1458 # elif defined(OBJFORMAT_MACHO)
1459 r = ocResolve_MachO ( oc );
1461 barf("resolveObjs: not implemented on this platform");
1463 if (!r) { return r; }
1464 oc->status = OBJECT_RESOLVED;
1470 /* -----------------------------------------------------------------------------
1471 * delete an object from the pool
1474 unloadObj( char *path )
1476 ObjectCode *oc, *prev;
1478 ASSERT(symhash != NULL);
1479 ASSERT(objects != NULL);
1484 for (oc = objects; oc; prev = oc, oc = oc->next) {
1485 if (!strcmp(oc->fileName,path)) {
1487 /* Remove all the mappings for the symbols within this
1492 for (i = 0; i < oc->n_symbols; i++) {
1493 if (oc->symbols[i] != NULL) {
1494 removeStrHashTable(symhash, oc->symbols[i], NULL);
1502 prev->next = oc->next;
1505 /* We're going to leave this in place, in case there are
1506 any pointers from the heap into it: */
1507 /* stgFree(oc->image); */
1508 stgFree(oc->fileName);
1509 stgFree(oc->symbols);
1510 stgFree(oc->sections);
1511 /* The local hash table should have been freed at the end
1512 of the ocResolve_ call on it. */
1513 ASSERT(oc->lochash == NULL);
1519 errorBelch("unloadObj: can't find `%s' to unload", path);
1523 /* -----------------------------------------------------------------------------
1524 * Sanity checking. For each ObjectCode, maintain a list of address ranges
1525 * which may be prodded during relocation, and abort if we try and write
1526 * outside any of these.
1528 static void addProddableBlock ( ObjectCode* oc, void* start, int size )
1531 = stgMallocBytes(sizeof(ProddableBlock), "addProddableBlock");
1532 /* debugBelch("aPB %p %p %d\n", oc, start, size); */
1536 pb->next = oc->proddables;
1537 oc->proddables = pb;
1540 static void checkProddableBlock ( ObjectCode* oc, void* addr )
1543 for (pb = oc->proddables; pb != NULL; pb = pb->next) {
1544 char* s = (char*)(pb->start);
1545 char* e = s + pb->size - 1;
1546 char* a = (char*)addr;
1547 /* Assumes that the biggest fixup involves a 4-byte write. This
1548 probably needs to be changed to 8 (ie, +7) on 64-bit
1550 if (a >= s && (a+3) <= e) return;
1552 barf("checkProddableBlock: invalid fixup in runtime linker");
1555 /* -----------------------------------------------------------------------------
1556 * Section management.
1558 static void addSection ( ObjectCode* oc, SectionKind kind,
1559 void* start, void* end )
1561 Section* s = stgMallocBytes(sizeof(Section), "addSection");
1565 s->next = oc->sections;
1568 debugBelch("addSection: %p-%p (size %d), kind %d\n",
1569 start, ((char*)end)-1, end - start + 1, kind );
1574 /* --------------------------------------------------------------------------
1575 * PowerPC specifics (jump islands)
1576 * ------------------------------------------------------------------------*/
1578 #if defined(powerpc_HOST_ARCH)
1581 ocAllocateJumpIslands
1583 Allocate additional space at the end of the object file image to make room
1586 PowerPC relative branch instructions have a 24 bit displacement field.
1587 As PPC code is always 4-byte-aligned, this yields a +-32MB range.
1588 If a particular imported symbol is outside this range, we have to redirect
1589 the jump to a short piece of new code that just loads the 32bit absolute
1590 address and jumps there.
1591 This function just allocates space for one 16 byte ppcJumpIsland for every
1592 undefined symbol in the object file. The code for the islands is filled in by
1593 makeJumpIsland below.
1596 static int ocAllocateJumpIslands( ObjectCode* oc, int count, int first )
1602 int misalignment = 0;
1604 misalignment = oc->misalignment;
1609 // round up to the nearest 4
1610 aligned = (oc->fileSize + 3) & ~3;
1613 #ifndef linux_HOST_OS /* mremap is a linux extension */
1614 #error ocAllocateJumpIslands doesnt want USE_MMAP to be defined
1617 pagesize = getpagesize();
1618 n = ROUND_UP( oc->fileSize, pagesize );
1619 m = ROUND_UP( aligned + sizeof (ppcJumpIsland) * count, pagesize );
1621 /* If we have a half-page-size file and map one page of it then
1622 * the part of the page after the size of the file remains accessible.
1623 * If, however, we map in 2 pages, the 2nd page is not accessible
1624 * and will give a "Bus Error" on access. To get around this, we check
1625 * if we need any extra pages for the jump islands and map them in
1626 * anonymously. We must check that we actually require extra pages
1627 * otherwise the attempt to mmap 0 pages of anonymous memory will
1633 /* The effect of this mremap() call is only the ensure that we have
1634 * a sufficient number of virtually contiguous pages. As returned from
1635 * mremap, the pages past the end of the file are not backed. We give
1636 * them a backing by using MAP_FIXED to map in anonymous pages.
1638 oc->image = mremap( oc->image, n, m, MREMAP_MAYMOVE );
1640 if( oc->image == MAP_FAILED )
1642 errorBelch( "Unable to mremap for Jump Islands\n" );
1646 if( mmap( oc->image + n, m - n, PROT_READ | PROT_WRITE | PROT_EXEC,
1647 MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED, 0, 0 ) == MAP_FAILED )
1649 errorBelch( "Unable to mmap( MAP_FIXED ) for Jump Islands\n" );
1655 oc->image -= misalignment;
1656 oc->image = stgReallocBytes( oc->image,
1658 aligned + sizeof (ppcJumpIsland) * count,
1659 "ocAllocateJumpIslands" );
1660 oc->image += misalignment;
1661 #endif /* USE_MMAP */
1663 oc->jump_islands = (ppcJumpIsland *) (oc->image + aligned);
1664 memset( oc->jump_islands, 0, sizeof (ppcJumpIsland) * count );
1667 oc->jump_islands = NULL;
1669 oc->island_start_symbol = first;
1670 oc->n_islands = count;
1675 static unsigned long makeJumpIsland( ObjectCode* oc,
1676 unsigned long symbolNumber,
1677 unsigned long target )
1679 ppcJumpIsland *island;
1681 if( symbolNumber < oc->island_start_symbol ||
1682 symbolNumber - oc->island_start_symbol > oc->n_islands)
1685 island = &oc->jump_islands[symbolNumber - oc->island_start_symbol];
1687 // lis r12, hi16(target)
1688 island->lis_r12 = 0x3d80;
1689 island->hi_addr = target >> 16;
1691 // ori r12, r12, lo16(target)
1692 island->ori_r12_r12 = 0x618c;
1693 island->lo_addr = target & 0xffff;
1696 island->mtctr_r12 = 0x7d8903a6;
1699 island->bctr = 0x4e800420;
1701 return (unsigned long) island;
1705 ocFlushInstructionCache
1707 Flush the data & instruction caches.
1708 Because the PPC has split data/instruction caches, we have to
1709 do that whenever we modify code at runtime.
1712 static void ocFlushInstructionCache( ObjectCode *oc )
1714 int n = (oc->fileSize + sizeof( ppcJumpIsland ) * oc->n_islands + 3) / 4;
1715 unsigned long *p = (unsigned long *) oc->image;
1719 __asm__ volatile ( "dcbf 0,%0\n\t"
1727 __asm__ volatile ( "sync\n\t"
1733 /* --------------------------------------------------------------------------
1734 * PEi386 specifics (Win32 targets)
1735 * ------------------------------------------------------------------------*/
1737 /* The information for this linker comes from
1738 Microsoft Portable Executable
1739 and Common Object File Format Specification
1740 revision 5.1 January 1998
1741 which SimonM says comes from the MS Developer Network CDs.
1743 It can be found there (on older CDs), but can also be found
1746 http://www.microsoft.com/hwdev/hardware/PECOFF.asp
1748 (this is Rev 6.0 from February 1999).
1750 Things move, so if that fails, try searching for it via
1752 http://www.google.com/search?q=PE+COFF+specification
1754 The ultimate reference for the PE format is the Winnt.h
1755 header file that comes with the Platform SDKs; as always,
1756 implementations will drift wrt their documentation.
1758 A good background article on the PE format is Matt Pietrek's
1759 March 1994 article in Microsoft System Journal (MSJ)
1760 (Vol.9, No. 3): "Peering Inside the PE: A Tour of the
1761 Win32 Portable Executable File Format." The info in there
1762 has recently been updated in a two part article in
1763 MSDN magazine, issues Feb and March 2002,
1764 "Inside Windows: An In-Depth Look into the Win32 Portable
1765 Executable File Format"
1767 John Levine's book "Linkers and Loaders" contains useful
1772 #if defined(OBJFORMAT_PEi386)
1776 typedef unsigned char UChar;
1777 typedef unsigned short UInt16;
1778 typedef unsigned int UInt32;
1785 UInt16 NumberOfSections;
1786 UInt32 TimeDateStamp;
1787 UInt32 PointerToSymbolTable;
1788 UInt32 NumberOfSymbols;
1789 UInt16 SizeOfOptionalHeader;
1790 UInt16 Characteristics;
1794 #define sizeof_COFF_header 20
1801 UInt32 VirtualAddress;
1802 UInt32 SizeOfRawData;
1803 UInt32 PointerToRawData;
1804 UInt32 PointerToRelocations;
1805 UInt32 PointerToLinenumbers;
1806 UInt16 NumberOfRelocations;
1807 UInt16 NumberOfLineNumbers;
1808 UInt32 Characteristics;
1812 #define sizeof_COFF_section 40
1819 UInt16 SectionNumber;
1822 UChar NumberOfAuxSymbols;
1826 #define sizeof_COFF_symbol 18
1831 UInt32 VirtualAddress;
1832 UInt32 SymbolTableIndex;
1837 #define sizeof_COFF_reloc 10
1840 /* From PE spec doc, section 3.3.2 */
1841 /* Note use of MYIMAGE_* since IMAGE_* are already defined in
1842 windows.h -- for the same purpose, but I want to know what I'm
1844 #define MYIMAGE_FILE_RELOCS_STRIPPED 0x0001
1845 #define MYIMAGE_FILE_EXECUTABLE_IMAGE 0x0002
1846 #define MYIMAGE_FILE_DLL 0x2000
1847 #define MYIMAGE_FILE_SYSTEM 0x1000
1848 #define MYIMAGE_FILE_BYTES_REVERSED_HI 0x8000
1849 #define MYIMAGE_FILE_BYTES_REVERSED_LO 0x0080
1850 #define MYIMAGE_FILE_32BIT_MACHINE 0x0100
1852 /* From PE spec doc, section 5.4.2 and 5.4.4 */
1853 #define MYIMAGE_SYM_CLASS_EXTERNAL 2
1854 #define MYIMAGE_SYM_CLASS_STATIC 3
1855 #define MYIMAGE_SYM_UNDEFINED 0
1857 /* From PE spec doc, section 4.1 */
1858 #define MYIMAGE_SCN_CNT_CODE 0x00000020
1859 #define MYIMAGE_SCN_CNT_INITIALIZED_DATA 0x00000040
1860 #define MYIMAGE_SCN_LNK_NRELOC_OVFL 0x01000000
1862 /* From PE spec doc, section 5.2.1 */
1863 #define MYIMAGE_REL_I386_DIR32 0x0006
1864 #define MYIMAGE_REL_I386_REL32 0x0014
1867 /* We use myindex to calculate array addresses, rather than
1868 simply doing the normal subscript thing. That's because
1869 some of the above structs have sizes which are not
1870 a whole number of words. GCC rounds their sizes up to a
1871 whole number of words, which means that the address calcs
1872 arising from using normal C indexing or pointer arithmetic
1873 are just plain wrong. Sigh.
1876 myindex ( int scale, void* base, int index )
1879 ((UChar*)base) + scale * index;
1884 printName ( UChar* name, UChar* strtab )
1886 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
1887 UInt32 strtab_offset = * (UInt32*)(name+4);
1888 debugBelch("%s", strtab + strtab_offset );
1891 for (i = 0; i < 8; i++) {
1892 if (name[i] == 0) break;
1893 debugBelch("%c", name[i] );
1900 copyName ( UChar* name, UChar* strtab, UChar* dst, int dstSize )
1902 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
1903 UInt32 strtab_offset = * (UInt32*)(name+4);
1904 strncpy ( dst, strtab+strtab_offset, dstSize );
1910 if (name[i] == 0) break;
1920 cstring_from_COFF_symbol_name ( UChar* name, UChar* strtab )
1923 /* If the string is longer than 8 bytes, look in the
1924 string table for it -- this will be correctly zero terminated.
1926 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
1927 UInt32 strtab_offset = * (UInt32*)(name+4);
1928 return ((UChar*)strtab) + strtab_offset;
1930 /* Otherwise, if shorter than 8 bytes, return the original,
1931 which by defn is correctly terminated.
1933 if (name[7]==0) return name;
1934 /* The annoying case: 8 bytes. Copy into a temporary
1935 (which is never freed ...)
1937 newstr = stgMallocBytes(9, "cstring_from_COFF_symbol_name");
1939 strncpy(newstr,name,8);
1945 /* Just compares the short names (first 8 chars) */
1946 static COFF_section *
1947 findPEi386SectionCalled ( ObjectCode* oc, char* name )
1951 = (COFF_header*)(oc->image);
1952 COFF_section* sectab
1954 ((UChar*)(oc->image))
1955 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
1957 for (i = 0; i < hdr->NumberOfSections; i++) {
1960 COFF_section* section_i
1962 myindex ( sizeof_COFF_section, sectab, i );
1963 n1 = (UChar*) &(section_i->Name);
1965 if (n1[0]==n2[0] && n1[1]==n2[1] && n1[2]==n2[2] &&
1966 n1[3]==n2[3] && n1[4]==n2[4] && n1[5]==n2[5] &&
1967 n1[6]==n2[6] && n1[7]==n2[7])
1976 zapTrailingAtSign ( UChar* sym )
1978 # define my_isdigit(c) ((c) >= '0' && (c) <= '9')
1980 if (sym[0] == 0) return;
1982 while (sym[i] != 0) i++;
1985 while (j > 0 && my_isdigit(sym[j])) j--;
1986 if (j > 0 && sym[j] == '@' && j != i) sym[j] = 0;
1992 ocVerifyImage_PEi386 ( ObjectCode* oc )
1997 COFF_section* sectab;
1998 COFF_symbol* symtab;
2000 /* debugBelch("\nLOADING %s\n", oc->fileName); */
2001 hdr = (COFF_header*)(oc->image);
2002 sectab = (COFF_section*) (
2003 ((UChar*)(oc->image))
2004 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2006 symtab = (COFF_symbol*) (
2007 ((UChar*)(oc->image))
2008 + hdr->PointerToSymbolTable
2010 strtab = ((UChar*)symtab)
2011 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
2013 if (hdr->Machine != 0x14c) {
2014 errorBelch("%s: Not x86 PEi386", oc->fileName);
2017 if (hdr->SizeOfOptionalHeader != 0) {
2018 errorBelch("%s: PEi386 with nonempty optional header", oc->fileName);
2021 if ( /* (hdr->Characteristics & MYIMAGE_FILE_RELOCS_STRIPPED) || */
2022 (hdr->Characteristics & MYIMAGE_FILE_EXECUTABLE_IMAGE) ||
2023 (hdr->Characteristics & MYIMAGE_FILE_DLL) ||
2024 (hdr->Characteristics & MYIMAGE_FILE_SYSTEM) ) {
2025 errorBelch("%s: Not a PEi386 object file", oc->fileName);
2028 if ( (hdr->Characteristics & MYIMAGE_FILE_BYTES_REVERSED_HI)
2029 /* || !(hdr->Characteristics & MYIMAGE_FILE_32BIT_MACHINE) */ ) {
2030 errorBelch("%s: Invalid PEi386 word size or endiannness: %d",
2032 (int)(hdr->Characteristics));
2035 /* If the string table size is way crazy, this might indicate that
2036 there are more than 64k relocations, despite claims to the
2037 contrary. Hence this test. */
2038 /* debugBelch("strtab size %d\n", * (UInt32*)strtab); */
2040 if ( (*(UInt32*)strtab) > 600000 ) {
2041 /* Note that 600k has no special significance other than being
2042 big enough to handle the almost-2MB-sized lumps that
2043 constitute HSwin32*.o. */
2044 debugBelch("PEi386 object has suspiciously large string table; > 64k relocs?");
2049 /* No further verification after this point; only debug printing. */
2051 IF_DEBUG(linker, i=1);
2052 if (i == 0) return 1;
2054 debugBelch( "sectab offset = %d\n", ((UChar*)sectab) - ((UChar*)hdr) );
2055 debugBelch( "symtab offset = %d\n", ((UChar*)symtab) - ((UChar*)hdr) );
2056 debugBelch( "strtab offset = %d\n", ((UChar*)strtab) - ((UChar*)hdr) );
2059 debugBelch( "Machine: 0x%x\n", (UInt32)(hdr->Machine) );
2060 debugBelch( "# sections: %d\n", (UInt32)(hdr->NumberOfSections) );
2061 debugBelch( "time/date: 0x%x\n", (UInt32)(hdr->TimeDateStamp) );
2062 debugBelch( "symtab offset: %d\n", (UInt32)(hdr->PointerToSymbolTable) );
2063 debugBelch( "# symbols: %d\n", (UInt32)(hdr->NumberOfSymbols) );
2064 debugBelch( "sz of opt hdr: %d\n", (UInt32)(hdr->SizeOfOptionalHeader) );
2065 debugBelch( "characteristics: 0x%x\n", (UInt32)(hdr->Characteristics) );
2067 /* Print the section table. */
2069 for (i = 0; i < hdr->NumberOfSections; i++) {
2071 COFF_section* sectab_i
2073 myindex ( sizeof_COFF_section, sectab, i );
2080 printName ( sectab_i->Name, strtab );
2090 sectab_i->VirtualSize,
2091 sectab_i->VirtualAddress,
2092 sectab_i->SizeOfRawData,
2093 sectab_i->PointerToRawData,
2094 sectab_i->NumberOfRelocations,
2095 sectab_i->PointerToRelocations,
2096 sectab_i->PointerToRawData
2098 reltab = (COFF_reloc*) (
2099 ((UChar*)(oc->image)) + sectab_i->PointerToRelocations
2102 if ( sectab_i->Characteristics & MYIMAGE_SCN_LNK_NRELOC_OVFL ) {
2103 /* If the relocation field (a short) has overflowed, the
2104 * real count can be found in the first reloc entry.
2106 * See Section 4.1 (last para) of the PE spec (rev6.0).
2108 COFF_reloc* rel = (COFF_reloc*)
2109 myindex ( sizeof_COFF_reloc, reltab, 0 );
2110 noRelocs = rel->VirtualAddress;
2113 noRelocs = sectab_i->NumberOfRelocations;
2117 for (; j < noRelocs; j++) {
2119 COFF_reloc* rel = (COFF_reloc*)
2120 myindex ( sizeof_COFF_reloc, reltab, j );
2122 " type 0x%-4x vaddr 0x%-8x name `",
2124 rel->VirtualAddress );
2125 sym = (COFF_symbol*)
2126 myindex ( sizeof_COFF_symbol, symtab, rel->SymbolTableIndex );
2127 /* Hmm..mysterious looking offset - what's it for? SOF */
2128 printName ( sym->Name, strtab -10 );
2135 debugBelch("string table has size 0x%x\n", * (UInt32*)strtab );
2136 debugBelch("---START of string table---\n");
2137 for (i = 4; i < *(Int32*)strtab; i++) {
2139 debugBelch("\n"); else
2140 debugBelch("%c", strtab[i] );
2142 debugBelch("--- END of string table---\n");
2147 COFF_symbol* symtab_i;
2148 if (i >= (Int32)(hdr->NumberOfSymbols)) break;
2149 symtab_i = (COFF_symbol*)
2150 myindex ( sizeof_COFF_symbol, symtab, i );
2156 printName ( symtab_i->Name, strtab );
2165 (Int32)(symtab_i->SectionNumber),
2166 (UInt32)symtab_i->Type,
2167 (UInt32)symtab_i->StorageClass,
2168 (UInt32)symtab_i->NumberOfAuxSymbols
2170 i += symtab_i->NumberOfAuxSymbols;
2180 ocGetNames_PEi386 ( ObjectCode* oc )
2183 COFF_section* sectab;
2184 COFF_symbol* symtab;
2191 hdr = (COFF_header*)(oc->image);
2192 sectab = (COFF_section*) (
2193 ((UChar*)(oc->image))
2194 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2196 symtab = (COFF_symbol*) (
2197 ((UChar*)(oc->image))
2198 + hdr->PointerToSymbolTable
2200 strtab = ((UChar*)(oc->image))
2201 + hdr->PointerToSymbolTable
2202 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
2204 /* Allocate space for any (local, anonymous) .bss sections. */
2206 for (i = 0; i < hdr->NumberOfSections; i++) {
2209 COFF_section* sectab_i
2211 myindex ( sizeof_COFF_section, sectab, i );
2212 if (0 != strcmp(sectab_i->Name, ".bss")) continue;
2213 /* sof 10/05: the PE spec text isn't too clear regarding what
2214 * the SizeOfRawData field is supposed to hold for object
2215 * file sections containing just uninitialized data -- for executables,
2216 * it is supposed to be zero; unclear what it's supposed to be
2217 * for object files. However, VirtualSize is guaranteed to be
2218 * zero for object files, which definitely suggests that SizeOfRawData
2219 * will be non-zero (where else would the size of this .bss section be
2220 * stored?) Looking at the COFF_section info for incoming object files,
2221 * this certainly appears to be the case.
2223 * => I suspect we've been incorrectly handling .bss sections in (relocatable)
2224 * object files up until now. This turned out to bite us with ghc-6.4.1's use
2225 * of gcc-3.4.x, which has started to emit initially-zeroed-out local 'static'
2226 * variable decls into to the .bss section. (The specific function in Q which
2227 * triggered this is libraries/base/cbits/dirUtils.c:__hscore_getFolderPath())
2229 if (sectab_i->VirtualSize == 0 && sectab_i->SizeOfRawData == 0) continue;
2230 /* This is a non-empty .bss section. Allocate zeroed space for
2231 it, and set its PointerToRawData field such that oc->image +
2232 PointerToRawData == addr_of_zeroed_space. */
2233 bss_sz = sectab_i->VirtualSize;
2234 if ( bss_sz < sectab_i->SizeOfRawData) { bss_sz = sectab_i->SizeOfRawData; }
2235 zspace = stgCallocBytes(1, bss_sz, "ocGetNames_PEi386(anonymous bss)");
2236 sectab_i->PointerToRawData = ((UChar*)zspace) - ((UChar*)(oc->image));
2237 addProddableBlock(oc, zspace, bss_sz);
2238 /* debugBelch("BSS anon section at 0x%x\n", zspace); */
2241 /* Copy section information into the ObjectCode. */
2243 for (i = 0; i < hdr->NumberOfSections; i++) {
2249 = SECTIONKIND_OTHER;
2250 COFF_section* sectab_i
2252 myindex ( sizeof_COFF_section, sectab, i );
2253 IF_DEBUG(linker, debugBelch("section name = %s\n", sectab_i->Name ));
2256 /* I'm sure this is the Right Way to do it. However, the
2257 alternative of testing the sectab_i->Name field seems to
2258 work ok with Cygwin.
2260 if (sectab_i->Characteristics & MYIMAGE_SCN_CNT_CODE ||
2261 sectab_i->Characteristics & MYIMAGE_SCN_CNT_INITIALIZED_DATA)
2262 kind = SECTIONKIND_CODE_OR_RODATA;
2265 if (0==strcmp(".text",sectab_i->Name) ||
2266 0==strcmp(".rdata",sectab_i->Name)||
2267 0==strcmp(".rodata",sectab_i->Name))
2268 kind = SECTIONKIND_CODE_OR_RODATA;
2269 if (0==strcmp(".data",sectab_i->Name) ||
2270 0==strcmp(".bss",sectab_i->Name))
2271 kind = SECTIONKIND_RWDATA;
2273 ASSERT(sectab_i->SizeOfRawData == 0 || sectab_i->VirtualSize == 0);
2274 sz = sectab_i->SizeOfRawData;
2275 if (sz < sectab_i->VirtualSize) sz = sectab_i->VirtualSize;
2277 start = ((UChar*)(oc->image)) + sectab_i->PointerToRawData;
2278 end = start + sz - 1;
2280 if (kind == SECTIONKIND_OTHER
2281 /* Ignore sections called which contain stabs debugging
2283 && 0 != strcmp(".stab", sectab_i->Name)
2284 && 0 != strcmp(".stabstr", sectab_i->Name)
2285 /* ignore constructor section for now */
2286 && 0 != strcmp(".ctors", sectab_i->Name)
2287 /* ignore section generated from .ident */
2288 && 0!= strcmp("/4", sectab_i->Name)
2290 errorBelch("Unknown PEi386 section name `%s' (while processing: %s)", sectab_i->Name, oc->fileName);
2294 if (kind != SECTIONKIND_OTHER && end >= start) {
2295 addSection(oc, kind, start, end);
2296 addProddableBlock(oc, start, end - start + 1);
2300 /* Copy exported symbols into the ObjectCode. */
2302 oc->n_symbols = hdr->NumberOfSymbols;
2303 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
2304 "ocGetNames_PEi386(oc->symbols)");
2305 /* Call me paranoid; I don't care. */
2306 for (i = 0; i < oc->n_symbols; i++)
2307 oc->symbols[i] = NULL;
2311 COFF_symbol* symtab_i;
2312 if (i >= (Int32)(hdr->NumberOfSymbols)) break;
2313 symtab_i = (COFF_symbol*)
2314 myindex ( sizeof_COFF_symbol, symtab, i );
2318 if (symtab_i->StorageClass == MYIMAGE_SYM_CLASS_EXTERNAL
2319 && symtab_i->SectionNumber != MYIMAGE_SYM_UNDEFINED) {
2320 /* This symbol is global and defined, viz, exported */
2321 /* for MYIMAGE_SYMCLASS_EXTERNAL
2322 && !MYIMAGE_SYM_UNDEFINED,
2323 the address of the symbol is:
2324 address of relevant section + offset in section
2326 COFF_section* sectabent
2327 = (COFF_section*) myindex ( sizeof_COFF_section,
2329 symtab_i->SectionNumber-1 );
2330 addr = ((UChar*)(oc->image))
2331 + (sectabent->PointerToRawData
2335 if (symtab_i->SectionNumber == MYIMAGE_SYM_UNDEFINED
2336 && symtab_i->Value > 0) {
2337 /* This symbol isn't in any section at all, ie, global bss.
2338 Allocate zeroed space for it. */
2339 addr = stgCallocBytes(1, symtab_i->Value,
2340 "ocGetNames_PEi386(non-anonymous bss)");
2341 addSection(oc, SECTIONKIND_RWDATA, addr,
2342 ((UChar*)addr) + symtab_i->Value - 1);
2343 addProddableBlock(oc, addr, symtab_i->Value);
2344 /* debugBelch("BSS section at 0x%x\n", addr); */
2347 if (addr != NULL ) {
2348 sname = cstring_from_COFF_symbol_name ( symtab_i->Name, strtab );
2349 /* debugBelch("addSymbol %p `%s \n", addr,sname); */
2350 IF_DEBUG(linker, debugBelch("addSymbol %p `%s'\n", addr,sname);)
2351 ASSERT(i >= 0 && i < oc->n_symbols);
2352 /* cstring_from_COFF_symbol_name always succeeds. */
2353 oc->symbols[i] = sname;
2354 ghciInsertStrHashTable(oc->fileName, symhash, sname, addr);
2358 "IGNORING symbol %d\n"
2362 printName ( symtab_i->Name, strtab );
2371 (Int32)(symtab_i->SectionNumber),
2372 (UInt32)symtab_i->Type,
2373 (UInt32)symtab_i->StorageClass,
2374 (UInt32)symtab_i->NumberOfAuxSymbols
2379 i += symtab_i->NumberOfAuxSymbols;
2388 ocResolve_PEi386 ( ObjectCode* oc )
2391 COFF_section* sectab;
2392 COFF_symbol* symtab;
2402 /* ToDo: should be variable-sized? But is at least safe in the
2403 sense of buffer-overrun-proof. */
2405 /* debugBelch("resolving for %s\n", oc->fileName); */
2407 hdr = (COFF_header*)(oc->image);
2408 sectab = (COFF_section*) (
2409 ((UChar*)(oc->image))
2410 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2412 symtab = (COFF_symbol*) (
2413 ((UChar*)(oc->image))
2414 + hdr->PointerToSymbolTable
2416 strtab = ((UChar*)(oc->image))
2417 + hdr->PointerToSymbolTable
2418 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
2420 for (i = 0; i < hdr->NumberOfSections; i++) {
2421 COFF_section* sectab_i
2423 myindex ( sizeof_COFF_section, sectab, i );
2426 ((UChar*)(oc->image)) + sectab_i->PointerToRelocations
2429 /* Ignore sections called which contain stabs debugging
2431 if (0 == strcmp(".stab", sectab_i->Name)
2432 || 0 == strcmp(".stabstr", sectab_i->Name)
2433 || 0 == strcmp(".ctors", sectab_i->Name))
2436 if ( sectab_i->Characteristics & MYIMAGE_SCN_LNK_NRELOC_OVFL ) {
2437 /* If the relocation field (a short) has overflowed, the
2438 * real count can be found in the first reloc entry.
2440 * See Section 4.1 (last para) of the PE spec (rev6.0).
2442 * Nov2003 update: the GNU linker still doesn't correctly
2443 * handle the generation of relocatable object files with
2444 * overflown relocations. Hence the output to warn of potential
2447 COFF_reloc* rel = (COFF_reloc*)
2448 myindex ( sizeof_COFF_reloc, reltab, 0 );
2449 noRelocs = rel->VirtualAddress;
2451 /* 10/05: we now assume (and check for) a GNU ld that is capable
2452 * of handling object files with (>2^16) of relocs.
2455 debugBelch("WARNING: Overflown relocation field (# relocs found: %u)\n",
2460 noRelocs = sectab_i->NumberOfRelocations;
2465 for (; j < noRelocs; j++) {
2467 COFF_reloc* reltab_j
2469 myindex ( sizeof_COFF_reloc, reltab, j );
2471 /* the location to patch */
2473 ((UChar*)(oc->image))
2474 + (sectab_i->PointerToRawData
2475 + reltab_j->VirtualAddress
2476 - sectab_i->VirtualAddress )
2478 /* the existing contents of pP */
2480 /* the symbol to connect to */
2481 sym = (COFF_symbol*)
2482 myindex ( sizeof_COFF_symbol,
2483 symtab, reltab_j->SymbolTableIndex );
2486 "reloc sec %2d num %3d: type 0x%-4x "
2487 "vaddr 0x%-8x name `",
2489 (UInt32)reltab_j->Type,
2490 reltab_j->VirtualAddress );
2491 printName ( sym->Name, strtab );
2492 debugBelch("'\n" ));
2494 if (sym->StorageClass == MYIMAGE_SYM_CLASS_STATIC) {
2495 COFF_section* section_sym
2496 = findPEi386SectionCalled ( oc, sym->Name );
2498 errorBelch("%s: can't find section `%s'", oc->fileName, sym->Name);
2501 S = ((UInt32)(oc->image))
2502 + (section_sym->PointerToRawData
2505 copyName ( sym->Name, strtab, symbol, 1000-1 );
2506 (void*)S = lookupLocalSymbol( oc, symbol );
2507 if ((void*)S != NULL) goto foundit;
2508 (void*)S = lookupSymbol( symbol );
2509 if ((void*)S != NULL) goto foundit;
2510 zapTrailingAtSign ( symbol );
2511 (void*)S = lookupLocalSymbol( oc, symbol );
2512 if ((void*)S != NULL) goto foundit;
2513 (void*)S = lookupSymbol( symbol );
2514 if ((void*)S != NULL) goto foundit;
2515 /* Newline first because the interactive linker has printed "linking..." */
2516 errorBelch("\n%s: unknown symbol `%s'", oc->fileName, symbol);
2520 checkProddableBlock(oc, pP);
2521 switch (reltab_j->Type) {
2522 case MYIMAGE_REL_I386_DIR32:
2525 case MYIMAGE_REL_I386_REL32:
2526 /* Tricky. We have to insert a displacement at
2527 pP which, when added to the PC for the _next_
2528 insn, gives the address of the target (S).
2529 Problem is to know the address of the next insn
2530 when we only know pP. We assume that this
2531 literal field is always the last in the insn,
2532 so that the address of the next insn is pP+4
2533 -- hence the constant 4.
2534 Also I don't know if A should be added, but so
2535 far it has always been zero.
2537 SOF 05/2005: 'A' (old contents of *pP) have been observed
2538 to contain values other than zero (the 'wx' object file
2539 that came with wxhaskell-0.9.4; dunno how it was compiled..).
2540 So, add displacement to old value instead of asserting
2541 A to be zero. Fixes wxhaskell-related crashes, and no other
2542 ill effects have been observed.
2544 Update: the reason why we're seeing these more elaborate
2545 relocations is due to a switch in how the NCG compiles SRTs
2546 and offsets to them from info tables. SRTs live in .(ro)data,
2547 while info tables live in .text, causing GAS to emit REL32/DISP32
2548 relocations with non-zero values. Adding the displacement is
2549 the right thing to do.
2551 *pP = S - ((UInt32)pP) - 4 + A;
2554 debugBelch("%s: unhandled PEi386 relocation type %d",
2555 oc->fileName, reltab_j->Type);
2562 IF_DEBUG(linker, debugBelch("completed %s", oc->fileName));
2566 #endif /* defined(OBJFORMAT_PEi386) */
2569 /* --------------------------------------------------------------------------
2571 * ------------------------------------------------------------------------*/
2573 #if defined(OBJFORMAT_ELF)
2578 #if defined(sparc_HOST_ARCH)
2579 # define ELF_TARGET_SPARC /* Used inside <elf.h> */
2580 #elif defined(i386_HOST_ARCH)
2581 # define ELF_TARGET_386 /* Used inside <elf.h> */
2582 #elif defined(x86_64_HOST_ARCH)
2583 # define ELF_TARGET_X64_64
2585 #elif defined (ia64_HOST_ARCH)
2586 # define ELF_TARGET_IA64 /* Used inside <elf.h> */
2588 # define ELF_FUNCTION_DESC /* calling convention uses function descriptors */
2589 # define ELF_NEED_GOT /* needs Global Offset Table */
2590 # define ELF_NEED_PLT /* needs Procedure Linkage Tables */
2593 #if !defined(openbsd_HOST_OS)
2596 /* openbsd elf has things in different places, with diff names */
2597 #include <elf_abi.h>
2598 #include <machine/reloc.h>
2599 #define R_386_32 RELOC_32
2600 #define R_386_PC32 RELOC_PC32
2604 * Define a set of types which can be used for both ELF32 and ELF64
2608 #define ELFCLASS ELFCLASS64
2609 #define Elf_Addr Elf64_Addr
2610 #define Elf_Word Elf64_Word
2611 #define Elf_Sword Elf64_Sword
2612 #define Elf_Ehdr Elf64_Ehdr
2613 #define Elf_Phdr Elf64_Phdr
2614 #define Elf_Shdr Elf64_Shdr
2615 #define Elf_Sym Elf64_Sym
2616 #define Elf_Rel Elf64_Rel
2617 #define Elf_Rela Elf64_Rela
2618 #define ELF_ST_TYPE ELF64_ST_TYPE
2619 #define ELF_ST_BIND ELF64_ST_BIND
2620 #define ELF_R_TYPE ELF64_R_TYPE
2621 #define ELF_R_SYM ELF64_R_SYM
2623 #define ELFCLASS ELFCLASS32
2624 #define Elf_Addr Elf32_Addr
2625 #define Elf_Word Elf32_Word
2626 #define Elf_Sword Elf32_Sword
2627 #define Elf_Ehdr Elf32_Ehdr
2628 #define Elf_Phdr Elf32_Phdr
2629 #define Elf_Shdr Elf32_Shdr
2630 #define Elf_Sym Elf32_Sym
2631 #define Elf_Rel Elf32_Rel
2632 #define Elf_Rela Elf32_Rela
2634 #define ELF_ST_TYPE ELF32_ST_TYPE
2637 #define ELF_ST_BIND ELF32_ST_BIND
2640 #define ELF_R_TYPE ELF32_R_TYPE
2643 #define ELF_R_SYM ELF32_R_SYM
2649 * Functions to allocate entries in dynamic sections. Currently we simply
2650 * preallocate a large number, and we don't check if a entry for the given
2651 * target already exists (a linear search is too slow). Ideally these
2652 * entries would be associated with symbols.
2655 /* These sizes sufficient to load HSbase + HShaskell98 + a few modules */
2656 #define GOT_SIZE 0x20000
2657 #define FUNCTION_TABLE_SIZE 0x10000
2658 #define PLT_SIZE 0x08000
2661 static Elf_Addr got[GOT_SIZE];
2662 static unsigned int gotIndex;
2663 static Elf_Addr gp_val = (Elf_Addr)got;
2666 allocateGOTEntry(Elf_Addr target)
2670 if (gotIndex >= GOT_SIZE)
2671 barf("Global offset table overflow");
2673 entry = &got[gotIndex++];
2675 return (Elf_Addr)entry;
2679 #ifdef ELF_FUNCTION_DESC
2685 static FunctionDesc functionTable[FUNCTION_TABLE_SIZE];
2686 static unsigned int functionTableIndex;
2689 allocateFunctionDesc(Elf_Addr target)
2691 FunctionDesc *entry;
2693 if (functionTableIndex >= FUNCTION_TABLE_SIZE)
2694 barf("Function table overflow");
2696 entry = &functionTable[functionTableIndex++];
2698 entry->gp = (Elf_Addr)gp_val;
2699 return (Elf_Addr)entry;
2703 copyFunctionDesc(Elf_Addr target)
2705 FunctionDesc *olddesc = (FunctionDesc *)target;
2706 FunctionDesc *newdesc;
2708 newdesc = (FunctionDesc *)allocateFunctionDesc(olddesc->ip);
2709 newdesc->gp = olddesc->gp;
2710 return (Elf_Addr)newdesc;
2715 #ifdef ia64_HOST_ARCH
2716 static void ia64_reloc_gprel22(Elf_Addr target, Elf_Addr value);
2717 static void ia64_reloc_pcrel21(Elf_Addr target, Elf_Addr value, ObjectCode *oc);
2719 static unsigned char plt_code[] =
2721 /* taken from binutils bfd/elfxx-ia64.c */
2722 0x0b, 0x78, 0x00, 0x02, 0x00, 0x24, /* [MMI] addl r15=0,r1;; */
2723 0x00, 0x41, 0x3c, 0x30, 0x28, 0xc0, /* ld8 r16=[r15],8 */
2724 0x01, 0x08, 0x00, 0x84, /* mov r14=r1;; */
2725 0x11, 0x08, 0x00, 0x1e, 0x18, 0x10, /* [MIB] ld8 r1=[r15] */
2726 0x60, 0x80, 0x04, 0x80, 0x03, 0x00, /* mov b6=r16 */
2727 0x60, 0x00, 0x80, 0x00 /* br.few b6;; */
2730 /* If we can't get to the function descriptor via gp, take a local copy of it */
2731 #define PLT_RELOC(code, target) { \
2732 Elf64_Sxword rel_value = target - gp_val; \
2733 if ((rel_value > 0x1fffff) || (rel_value < -0x1fffff)) \
2734 ia64_reloc_gprel22((Elf_Addr)code, copyFunctionDesc(target)); \
2736 ia64_reloc_gprel22((Elf_Addr)code, target); \
2741 unsigned char code[sizeof(plt_code)];
2745 allocatePLTEntry(Elf_Addr target, ObjectCode *oc)
2747 PLTEntry *plt = (PLTEntry *)oc->plt;
2750 if (oc->pltIndex >= PLT_SIZE)
2751 barf("Procedure table overflow");
2753 entry = &plt[oc->pltIndex++];
2754 memcpy(entry->code, plt_code, sizeof(entry->code));
2755 PLT_RELOC(entry->code, target);
2756 return (Elf_Addr)entry;
2762 return (PLT_SIZE * sizeof(PLTEntry));
2767 #if x86_64_HOST_ARCH
2768 // On x86_64, 32-bit relocations are often used, which requires that
2769 // we can resolve a symbol to a 32-bit offset. However, shared
2770 // libraries are placed outside the 2Gb area, which leaves us with a
2771 // problem when we need to give a 32-bit offset to a symbol in a
2774 // For a function symbol, we can allocate a bounce sequence inside the
2775 // 2Gb area and resolve the symbol to this. The bounce sequence is
2776 // simply a long jump instruction to the real location of the symbol.
2778 // For data references, we're screwed.
2781 unsigned char jmp[8]; /* 6 byte instruction: jmpq *0x00000002(%rip) */
2785 #define X86_64_BB_SIZE 1024
2787 static x86_64_bounce *x86_64_bounce_buffer = NULL;
2788 static nat x86_64_bb_next_off;
2791 x86_64_high_symbol( char *lbl, void *addr )
2793 x86_64_bounce *bounce;
2795 if ( x86_64_bounce_buffer == NULL ||
2796 x86_64_bb_next_off >= X86_64_BB_SIZE ) {
2797 x86_64_bounce_buffer =
2798 mmap(NULL, X86_64_BB_SIZE * sizeof(x86_64_bounce),
2799 PROT_EXEC|PROT_READ|PROT_WRITE,
2800 MAP_PRIVATE|MAP_32BIT|MAP_ANONYMOUS, -1, 0);
2801 if (x86_64_bounce_buffer == MAP_FAILED) {
2802 barf("x86_64_high_symbol: mmap failed");
2804 x86_64_bb_next_off = 0;
2806 bounce = &x86_64_bounce_buffer[x86_64_bb_next_off];
2807 bounce->jmp[0] = 0xff;
2808 bounce->jmp[1] = 0x25;
2809 bounce->jmp[2] = 0x02;
2810 bounce->jmp[3] = 0x00;
2811 bounce->jmp[4] = 0x00;
2812 bounce->jmp[5] = 0x00;
2813 bounce->addr = addr;
2814 x86_64_bb_next_off++;
2816 IF_DEBUG(linker, debugBelch("x86_64: allocated bounce entry for %s->%p at %p\n",
2817 lbl, addr, bounce));
2819 insertStrHashTable(symhash, lbl, bounce);
2826 * Generic ELF functions
2830 findElfSection ( void* objImage, Elf_Word sh_type )
2832 char* ehdrC = (char*)objImage;
2833 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2834 Elf_Shdr* shdr = (Elf_Shdr*)(ehdrC + ehdr->e_shoff);
2835 char* sh_strtab = ehdrC + shdr[ehdr->e_shstrndx].sh_offset;
2839 for (i = 0; i < ehdr->e_shnum; i++) {
2840 if (shdr[i].sh_type == sh_type
2841 /* Ignore the section header's string table. */
2842 && i != ehdr->e_shstrndx
2843 /* Ignore string tables named .stabstr, as they contain
2845 && 0 != memcmp(".stabstr", sh_strtab + shdr[i].sh_name, 8)
2847 ptr = ehdrC + shdr[i].sh_offset;
2854 #if defined(ia64_HOST_ARCH)
2856 findElfSegment ( void* objImage, Elf_Addr vaddr )
2858 char* ehdrC = (char*)objImage;
2859 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2860 Elf_Phdr* phdr = (Elf_Phdr*)(ehdrC + ehdr->e_phoff);
2861 Elf_Addr segaddr = 0;
2864 for (i = 0; i < ehdr->e_phnum; i++) {
2865 segaddr = phdr[i].p_vaddr;
2866 if ((vaddr >= segaddr) && (vaddr < segaddr + phdr[i].p_memsz))
2874 ocVerifyImage_ELF ( ObjectCode* oc )
2878 int i, j, nent, nstrtab, nsymtabs;
2882 char* ehdrC = (char*)(oc->image);
2883 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2885 if (ehdr->e_ident[EI_MAG0] != ELFMAG0 ||
2886 ehdr->e_ident[EI_MAG1] != ELFMAG1 ||
2887 ehdr->e_ident[EI_MAG2] != ELFMAG2 ||
2888 ehdr->e_ident[EI_MAG3] != ELFMAG3) {
2889 errorBelch("%s: not an ELF object", oc->fileName);
2893 if (ehdr->e_ident[EI_CLASS] != ELFCLASS) {
2894 errorBelch("%s: unsupported ELF format", oc->fileName);
2898 if (ehdr->e_ident[EI_DATA] == ELFDATA2LSB) {
2899 IF_DEBUG(linker,debugBelch( "Is little-endian\n" ));
2901 if (ehdr->e_ident[EI_DATA] == ELFDATA2MSB) {
2902 IF_DEBUG(linker,debugBelch( "Is big-endian\n" ));
2904 errorBelch("%s: unknown endiannness", oc->fileName);
2908 if (ehdr->e_type != ET_REL) {
2909 errorBelch("%s: not a relocatable object (.o) file", oc->fileName);
2912 IF_DEBUG(linker, debugBelch( "Is a relocatable object (.o) file\n" ));
2914 IF_DEBUG(linker,debugBelch( "Architecture is " ));
2915 switch (ehdr->e_machine) {
2916 case EM_386: IF_DEBUG(linker,debugBelch( "x86" )); break;
2917 #ifdef EM_SPARC32PLUS
2918 case EM_SPARC32PLUS:
2920 case EM_SPARC: IF_DEBUG(linker,debugBelch( "sparc" )); break;
2922 case EM_IA_64: IF_DEBUG(linker,debugBelch( "ia64" )); break;
2924 case EM_PPC: IF_DEBUG(linker,debugBelch( "powerpc32" )); break;
2926 case EM_X86_64: IF_DEBUG(linker,debugBelch( "x86_64" )); break;
2928 default: IF_DEBUG(linker,debugBelch( "unknown" ));
2929 errorBelch("%s: unknown architecture", oc->fileName);
2933 IF_DEBUG(linker,debugBelch(
2934 "\nSection header table: start %ld, n_entries %d, ent_size %d\n",
2935 (long)ehdr->e_shoff, ehdr->e_shnum, ehdr->e_shentsize ));
2937 ASSERT (ehdr->e_shentsize == sizeof(Elf_Shdr));
2939 shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
2941 if (ehdr->e_shstrndx == SHN_UNDEF) {
2942 errorBelch("%s: no section header string table", oc->fileName);
2945 IF_DEBUG(linker,debugBelch( "Section header string table is section %d\n",
2947 sh_strtab = ehdrC + shdr[ehdr->e_shstrndx].sh_offset;
2950 for (i = 0; i < ehdr->e_shnum; i++) {
2951 IF_DEBUG(linker,debugBelch("%2d: ", i ));
2952 IF_DEBUG(linker,debugBelch("type=%2d ", (int)shdr[i].sh_type ));
2953 IF_DEBUG(linker,debugBelch("size=%4d ", (int)shdr[i].sh_size ));
2954 IF_DEBUG(linker,debugBelch("offs=%4d ", (int)shdr[i].sh_offset ));
2955 IF_DEBUG(linker,debugBelch(" (%p .. %p) ",
2956 ehdrC + shdr[i].sh_offset,
2957 ehdrC + shdr[i].sh_offset + shdr[i].sh_size - 1));
2959 if (shdr[i].sh_type == SHT_REL) {
2960 IF_DEBUG(linker,debugBelch("Rel " ));
2961 } else if (shdr[i].sh_type == SHT_RELA) {
2962 IF_DEBUG(linker,debugBelch("RelA " ));
2964 IF_DEBUG(linker,debugBelch(" "));
2967 IF_DEBUG(linker,debugBelch("sname=%s\n", sh_strtab + shdr[i].sh_name ));
2971 IF_DEBUG(linker,debugBelch( "\nString tables" ));
2974 for (i = 0; i < ehdr->e_shnum; i++) {
2975 if (shdr[i].sh_type == SHT_STRTAB
2976 /* Ignore the section header's string table. */
2977 && i != ehdr->e_shstrndx
2978 /* Ignore string tables named .stabstr, as they contain
2980 && 0 != memcmp(".stabstr", sh_strtab + shdr[i].sh_name, 8)
2982 IF_DEBUG(linker,debugBelch(" section %d is a normal string table", i ));
2983 strtab = ehdrC + shdr[i].sh_offset;
2988 errorBelch("%s: no string tables, or too many", oc->fileName);
2993 IF_DEBUG(linker,debugBelch( "\nSymbol tables" ));
2994 for (i = 0; i < ehdr->e_shnum; i++) {
2995 if (shdr[i].sh_type != SHT_SYMTAB) continue;
2996 IF_DEBUG(linker,debugBelch( "section %d is a symbol table\n", i ));
2998 stab = (Elf_Sym*) (ehdrC + shdr[i].sh_offset);
2999 nent = shdr[i].sh_size / sizeof(Elf_Sym);
3000 IF_DEBUG(linker,debugBelch( " number of entries is apparently %d (%ld rem)\n",
3002 (long)shdr[i].sh_size % sizeof(Elf_Sym)
3004 if (0 != shdr[i].sh_size % sizeof(Elf_Sym)) {
3005 errorBelch("%s: non-integral number of symbol table entries", oc->fileName);
3008 for (j = 0; j < nent; j++) {
3009 IF_DEBUG(linker,debugBelch(" %2d ", j ));
3010 IF_DEBUG(linker,debugBelch(" sec=%-5d size=%-3d val=%5p ",
3011 (int)stab[j].st_shndx,
3012 (int)stab[j].st_size,
3013 (char*)stab[j].st_value ));
3015 IF_DEBUG(linker,debugBelch("type=" ));
3016 switch (ELF_ST_TYPE(stab[j].st_info)) {
3017 case STT_NOTYPE: IF_DEBUG(linker,debugBelch("notype " )); break;
3018 case STT_OBJECT: IF_DEBUG(linker,debugBelch("object " )); break;
3019 case STT_FUNC : IF_DEBUG(linker,debugBelch("func " )); break;
3020 case STT_SECTION: IF_DEBUG(linker,debugBelch("section" )); break;
3021 case STT_FILE: IF_DEBUG(linker,debugBelch("file " )); break;
3022 default: IF_DEBUG(linker,debugBelch("? " )); break;
3024 IF_DEBUG(linker,debugBelch(" " ));
3026 IF_DEBUG(linker,debugBelch("bind=" ));
3027 switch (ELF_ST_BIND(stab[j].st_info)) {
3028 case STB_LOCAL : IF_DEBUG(linker,debugBelch("local " )); break;
3029 case STB_GLOBAL: IF_DEBUG(linker,debugBelch("global" )); break;
3030 case STB_WEAK : IF_DEBUG(linker,debugBelch("weak " )); break;
3031 default: IF_DEBUG(linker,debugBelch("? " )); break;
3033 IF_DEBUG(linker,debugBelch(" " ));
3035 IF_DEBUG(linker,debugBelch("name=%s\n", strtab + stab[j].st_name ));
3039 if (nsymtabs == 0) {
3040 errorBelch("%s: didn't find any symbol tables", oc->fileName);
3047 static int getSectionKind_ELF( Elf_Shdr *hdr, int *is_bss )
3051 if (hdr->sh_type == SHT_PROGBITS
3052 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_EXECINSTR)) {
3053 /* .text-style section */
3054 return SECTIONKIND_CODE_OR_RODATA;
3057 if (hdr->sh_type == SHT_PROGBITS
3058 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_WRITE)) {
3059 /* .data-style section */
3060 return SECTIONKIND_RWDATA;
3063 if (hdr->sh_type == SHT_PROGBITS
3064 && (hdr->sh_flags & SHF_ALLOC) && !(hdr->sh_flags & SHF_WRITE)) {
3065 /* .rodata-style section */
3066 return SECTIONKIND_CODE_OR_RODATA;
3069 if (hdr->sh_type == SHT_NOBITS
3070 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_WRITE)) {
3071 /* .bss-style section */
3073 return SECTIONKIND_RWDATA;
3076 return SECTIONKIND_OTHER;
3081 ocGetNames_ELF ( ObjectCode* oc )
3086 char* ehdrC = (char*)(oc->image);
3087 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
3088 char* strtab = findElfSection ( ehdrC, SHT_STRTAB );
3089 Elf_Shdr* shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
3091 ASSERT(symhash != NULL);
3094 errorBelch("%s: no strtab", oc->fileName);
3099 for (i = 0; i < ehdr->e_shnum; i++) {
3100 /* Figure out what kind of section it is. Logic derived from
3101 Figure 1.14 ("Special Sections") of the ELF document
3102 ("Portable Formats Specification, Version 1.1"). */
3104 SectionKind kind = getSectionKind_ELF(&shdr[i], &is_bss);
3106 if (is_bss && shdr[i].sh_size > 0) {
3107 /* This is a non-empty .bss section. Allocate zeroed space for
3108 it, and set its .sh_offset field such that
3109 ehdrC + .sh_offset == addr_of_zeroed_space. */
3110 char* zspace = stgCallocBytes(1, shdr[i].sh_size,
3111 "ocGetNames_ELF(BSS)");
3112 shdr[i].sh_offset = ((char*)zspace) - ((char*)ehdrC);
3114 debugBelch("BSS section at 0x%x, size %d\n",
3115 zspace, shdr[i].sh_size);
3119 /* fill in the section info */
3120 if (kind != SECTIONKIND_OTHER && shdr[i].sh_size > 0) {
3121 addProddableBlock(oc, ehdrC + shdr[i].sh_offset, shdr[i].sh_size);
3122 addSection(oc, kind, ehdrC + shdr[i].sh_offset,
3123 ehdrC + shdr[i].sh_offset + shdr[i].sh_size - 1);
3126 if (shdr[i].sh_type != SHT_SYMTAB) continue;
3128 /* copy stuff into this module's object symbol table */
3129 stab = (Elf_Sym*) (ehdrC + shdr[i].sh_offset);
3130 nent = shdr[i].sh_size / sizeof(Elf_Sym);
3132 oc->n_symbols = nent;
3133 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
3134 "ocGetNames_ELF(oc->symbols)");
3136 for (j = 0; j < nent; j++) {
3138 char isLocal = FALSE; /* avoids uninit-var warning */
3140 char* nm = strtab + stab[j].st_name;
3141 int secno = stab[j].st_shndx;
3143 /* Figure out if we want to add it; if so, set ad to its
3144 address. Otherwise leave ad == NULL. */
3146 if (secno == SHN_COMMON) {
3148 ad = stgCallocBytes(1, stab[j].st_size, "ocGetNames_ELF(COMMON)");
3150 debugBelch("COMMON symbol, size %d name %s\n",
3151 stab[j].st_size, nm);
3153 /* Pointless to do addProddableBlock() for this area,
3154 since the linker should never poke around in it. */
3157 if ( ( ELF_ST_BIND(stab[j].st_info)==STB_GLOBAL
3158 || ELF_ST_BIND(stab[j].st_info)==STB_LOCAL
3160 /* and not an undefined symbol */
3161 && stab[j].st_shndx != SHN_UNDEF
3162 /* and not in a "special section" */
3163 && stab[j].st_shndx < SHN_LORESERVE
3165 /* and it's a not a section or string table or anything silly */
3166 ( ELF_ST_TYPE(stab[j].st_info)==STT_FUNC ||
3167 ELF_ST_TYPE(stab[j].st_info)==STT_OBJECT ||
3168 ELF_ST_TYPE(stab[j].st_info)==STT_NOTYPE
3171 /* Section 0 is the undefined section, hence > and not >=. */
3172 ASSERT(secno > 0 && secno < ehdr->e_shnum);
3174 if (shdr[secno].sh_type == SHT_NOBITS) {
3175 debugBelch(" BSS symbol, size %d off %d name %s\n",
3176 stab[j].st_size, stab[j].st_value, nm);
3179 ad = ehdrC + shdr[ secno ].sh_offset + stab[j].st_value;
3180 if (ELF_ST_BIND(stab[j].st_info)==STB_LOCAL) {
3183 #ifdef ELF_FUNCTION_DESC
3184 /* dlsym() and the initialisation table both give us function
3185 * descriptors, so to be consistent we store function descriptors
3186 * in the symbol table */
3187 if (ELF_ST_TYPE(stab[j].st_info) == STT_FUNC)
3188 ad = (char *)allocateFunctionDesc((Elf_Addr)ad);
3190 IF_DEBUG(linker,debugBelch( "addOTabName(GLOB): %10p %s %s",
3191 ad, oc->fileName, nm ));
3196 /* And the decision is ... */
3200 oc->symbols[j] = nm;
3203 /* Ignore entirely. */
3205 ghciInsertStrHashTable(oc->fileName, symhash, nm, ad);
3209 IF_DEBUG(linker,debugBelch( "skipping `%s'\n",
3210 strtab + stab[j].st_name ));
3213 "skipping bind = %d, type = %d, shndx = %d `%s'\n",
3214 (int)ELF_ST_BIND(stab[j].st_info),
3215 (int)ELF_ST_TYPE(stab[j].st_info),
3216 (int)stab[j].st_shndx,
3217 strtab + stab[j].st_name
3220 oc->symbols[j] = NULL;
3229 /* Do ELF relocations which lack an explicit addend. All x86-linux
3230 relocations appear to be of this form. */
3232 do_Elf_Rel_relocations ( ObjectCode* oc, char* ehdrC,
3233 Elf_Shdr* shdr, int shnum,
3234 Elf_Sym* stab, char* strtab )
3239 Elf_Rel* rtab = (Elf_Rel*) (ehdrC + shdr[shnum].sh_offset);
3240 int nent = shdr[shnum].sh_size / sizeof(Elf_Rel);
3241 int target_shndx = shdr[shnum].sh_info;
3242 int symtab_shndx = shdr[shnum].sh_link;
3244 stab = (Elf_Sym*) (ehdrC + shdr[ symtab_shndx ].sh_offset);
3245 targ = (Elf_Word*)(ehdrC + shdr[ target_shndx ].sh_offset);
3246 IF_DEBUG(linker,debugBelch( "relocations for section %d using symtab %d\n",
3247 target_shndx, symtab_shndx ));
3249 /* Skip sections that we're not interested in. */
3252 SectionKind kind = getSectionKind_ELF(&shdr[target_shndx], &is_bss);
3253 if (kind == SECTIONKIND_OTHER) {
3254 IF_DEBUG(linker,debugBelch( "skipping (target section not loaded)"));
3259 for (j = 0; j < nent; j++) {
3260 Elf_Addr offset = rtab[j].r_offset;
3261 Elf_Addr info = rtab[j].r_info;
3263 Elf_Addr P = ((Elf_Addr)targ) + offset;
3264 Elf_Word* pP = (Elf_Word*)P;
3269 StgStablePtr stablePtr;
3272 IF_DEBUG(linker,debugBelch( "Rel entry %3d is raw(%6p %6p)",
3273 j, (void*)offset, (void*)info ));
3275 IF_DEBUG(linker,debugBelch( " ZERO" ));
3278 Elf_Sym sym = stab[ELF_R_SYM(info)];
3279 /* First see if it is a local symbol. */
3280 if (ELF_ST_BIND(sym.st_info) == STB_LOCAL) {
3281 /* Yes, so we can get the address directly from the ELF symbol
3283 symbol = sym.st_name==0 ? "(noname)" : strtab+sym.st_name;
3285 (ehdrC + shdr[ sym.st_shndx ].sh_offset
3286 + stab[ELF_R_SYM(info)].st_value);
3289 symbol = strtab + sym.st_name;
3290 stablePtr = (StgStablePtr)lookupHashTable(stablehash, (StgWord)symbol);
3291 if (NULL == stablePtr) {
3292 /* No, so look up the name in our global table. */
3293 S_tmp = lookupSymbol( symbol );
3294 S = (Elf_Addr)S_tmp;
3296 stableVal = deRefStablePtr( stablePtr );
3297 addRootObject((void*)P);
3299 S = (Elf_Addr)S_tmp;
3303 errorBelch("%s: unknown symbol `%s'", oc->fileName, symbol);
3306 IF_DEBUG(linker,debugBelch( "`%s' resolves to %p\n", symbol, (void*)S ));
3309 IF_DEBUG(linker,debugBelch( "Reloc: P = %p S = %p A = %p\n",
3310 (void*)P, (void*)S, (void*)A ));
3311 checkProddableBlock ( oc, pP );
3315 switch (ELF_R_TYPE(info)) {
3316 # ifdef i386_HOST_ARCH
3317 case R_386_32: *pP = value; break;
3318 case R_386_PC32: *pP = value - P; break;
3321 errorBelch("%s: unhandled ELF relocation(Rel) type %lu\n",
3322 oc->fileName, (lnat)ELF_R_TYPE(info));
3330 /* Do ELF relocations for which explicit addends are supplied.
3331 sparc-solaris relocations appear to be of this form. */
3333 do_Elf_Rela_relocations ( ObjectCode* oc, char* ehdrC,
3334 Elf_Shdr* shdr, int shnum,
3335 Elf_Sym* stab, char* strtab )
3338 char *symbol = NULL;
3340 Elf_Rela* rtab = (Elf_Rela*) (ehdrC + shdr[shnum].sh_offset);
3341 int nent = shdr[shnum].sh_size / sizeof(Elf_Rela);
3342 int target_shndx = shdr[shnum].sh_info;
3343 int symtab_shndx = shdr[shnum].sh_link;
3345 stab = (Elf_Sym*) (ehdrC + shdr[ symtab_shndx ].sh_offset);
3346 targ = (Elf_Addr) (ehdrC + shdr[ target_shndx ].sh_offset);
3347 IF_DEBUG(linker,debugBelch( "relocations for section %d using symtab %d\n",
3348 target_shndx, symtab_shndx ));
3350 for (j = 0; j < nent; j++) {
3351 #if defined(DEBUG) || defined(sparc_HOST_ARCH) || defined(ia64_HOST_ARCH) || defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH)
3352 /* This #ifdef only serves to avoid unused-var warnings. */
3353 Elf_Addr offset = rtab[j].r_offset;
3354 Elf_Addr P = targ + offset;
3356 Elf_Addr info = rtab[j].r_info;
3357 Elf_Addr A = rtab[j].r_addend;
3361 # if defined(sparc_HOST_ARCH)
3362 Elf_Word* pP = (Elf_Word*)P;
3364 # elif defined(ia64_HOST_ARCH)
3365 Elf64_Xword *pP = (Elf64_Xword *)P;
3367 # elif defined(powerpc_HOST_ARCH)
3371 IF_DEBUG(linker,debugBelch( "Rel entry %3d is raw(%6p %6p %6p) ",
3372 j, (void*)offset, (void*)info,
3375 IF_DEBUG(linker,debugBelch( " ZERO" ));
3378 Elf_Sym sym = stab[ELF_R_SYM(info)];
3379 /* First see if it is a local symbol. */
3380 if (ELF_ST_BIND(sym.st_info) == STB_LOCAL) {
3381 /* Yes, so we can get the address directly from the ELF symbol
3383 symbol = sym.st_name==0 ? "(noname)" : strtab+sym.st_name;
3385 (ehdrC + shdr[ sym.st_shndx ].sh_offset
3386 + stab[ELF_R_SYM(info)].st_value);
3387 #ifdef ELF_FUNCTION_DESC
3388 /* Make a function descriptor for this function */
3389 if (S && ELF_ST_TYPE(sym.st_info) == STT_FUNC) {
3390 S = allocateFunctionDesc(S + A);
3395 /* No, so look up the name in our global table. */
3396 symbol = strtab + sym.st_name;
3397 S_tmp = lookupSymbol( symbol );
3398 S = (Elf_Addr)S_tmp;
3400 #ifdef ELF_FUNCTION_DESC
3401 /* If a function, already a function descriptor - we would
3402 have to copy it to add an offset. */
3403 if (S && (ELF_ST_TYPE(sym.st_info) == STT_FUNC) && (A != 0))
3404 errorBelch("%s: function %s with addend %p", oc->fileName, symbol, (void *)A);
3408 errorBelch("%s: unknown symbol `%s'", oc->fileName, symbol);
3411 IF_DEBUG(linker,debugBelch( "`%s' resolves to %p", symbol, (void*)S ));
3414 IF_DEBUG(linker,debugBelch("Reloc: P = %p S = %p A = %p\n",
3415 (void*)P, (void*)S, (void*)A ));
3416 /* checkProddableBlock ( oc, (void*)P ); */
3420 switch (ELF_R_TYPE(info)) {
3421 # if defined(sparc_HOST_ARCH)
3422 case R_SPARC_WDISP30:
3423 w1 = *pP & 0xC0000000;
3424 w2 = (Elf_Word)((value - P) >> 2);
3425 ASSERT((w2 & 0xC0000000) == 0);
3430 w1 = *pP & 0xFFC00000;
3431 w2 = (Elf_Word)(value >> 10);
3432 ASSERT((w2 & 0xFFC00000) == 0);
3438 w2 = (Elf_Word)(value & 0x3FF);
3439 ASSERT((w2 & ~0x3FF) == 0);
3443 /* According to the Sun documentation:
3445 This relocation type resembles R_SPARC_32, except it refers to an
3446 unaligned word. That is, the word to be relocated must be treated
3447 as four separate bytes with arbitrary alignment, not as a word
3448 aligned according to the architecture requirements.
3450 (JRS: which means that freeloading on the R_SPARC_32 case
3451 is probably wrong, but hey ...)
3455 w2 = (Elf_Word)value;
3458 # elif defined(ia64_HOST_ARCH)
3459 case R_IA64_DIR64LSB:
3460 case R_IA64_FPTR64LSB:
3463 case R_IA64_PCREL64LSB:
3466 case R_IA64_SEGREL64LSB:
3467 addr = findElfSegment(ehdrC, value);
3470 case R_IA64_GPREL22:
3471 ia64_reloc_gprel22(P, value);
3473 case R_IA64_LTOFF22:
3474 case R_IA64_LTOFF22X:
3475 case R_IA64_LTOFF_FPTR22:
3476 addr = allocateGOTEntry(value);
3477 ia64_reloc_gprel22(P, addr);
3479 case R_IA64_PCREL21B:
3480 ia64_reloc_pcrel21(P, S, oc);
3483 /* This goes with R_IA64_LTOFF22X and points to the load to
3484 * convert into a move. We don't implement relaxation. */
3486 # elif defined(powerpc_HOST_ARCH)
3487 case R_PPC_ADDR16_LO:
3488 *(Elf32_Half*) P = value;
3491 case R_PPC_ADDR16_HI:
3492 *(Elf32_Half*) P = value >> 16;
3495 case R_PPC_ADDR16_HA:
3496 *(Elf32_Half*) P = (value + 0x8000) >> 16;
3500 *(Elf32_Word *) P = value;
3504 *(Elf32_Word *) P = value - P;
3510 if( delta << 6 >> 6 != delta )
3512 value = makeJumpIsland( oc, ELF_R_SYM(info), value );
3515 if( value == 0 || delta << 6 >> 6 != delta )
3517 barf( "Unable to make ppcJumpIsland for #%d",
3523 *(Elf_Word *) P = (*(Elf_Word *) P & 0xfc000003)
3524 | (delta & 0x3fffffc);
3528 #if x86_64_HOST_ARCH
3530 *(Elf64_Xword *)P = value;
3535 StgInt64 off = value - P;
3536 if (off >= 0x7fffffffL || off < -0x80000000L) {
3537 barf("R_X86_64_PC32 relocation out of range: %s = %p",
3540 *(Elf64_Word *)P = (Elf64_Word)off;
3545 if (value >= 0x7fffffffL) {
3546 barf("R_X86_64_32 relocation out of range: %s = %p\n",
3549 *(Elf64_Word *)P = (Elf64_Word)value;
3553 if ((StgInt64)value > 0x7fffffffL || (StgInt64)value < -0x80000000L) {
3554 barf("R_X86_64_32S relocation out of range: %s = %p\n",
3557 *(Elf64_Sword *)P = (Elf64_Sword)value;
3562 errorBelch("%s: unhandled ELF relocation(RelA) type %lu\n",
3563 oc->fileName, (lnat)ELF_R_TYPE(info));
3572 ocResolve_ELF ( ObjectCode* oc )
3576 Elf_Sym* stab = NULL;
3577 char* ehdrC = (char*)(oc->image);
3578 Elf_Ehdr* ehdr = (Elf_Ehdr*) ehdrC;
3579 Elf_Shdr* shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
3581 /* first find "the" symbol table */
3582 stab = (Elf_Sym*) findElfSection ( ehdrC, SHT_SYMTAB );
3584 /* also go find the string table */
3585 strtab = findElfSection ( ehdrC, SHT_STRTAB );
3587 if (stab == NULL || strtab == NULL) {
3588 errorBelch("%s: can't find string or symbol table", oc->fileName);
3592 /* Process the relocation sections. */
3593 for (shnum = 0; shnum < ehdr->e_shnum; shnum++) {
3594 if (shdr[shnum].sh_type == SHT_REL) {
3595 ok = do_Elf_Rel_relocations ( oc, ehdrC, shdr,
3596 shnum, stab, strtab );
3600 if (shdr[shnum].sh_type == SHT_RELA) {
3601 ok = do_Elf_Rela_relocations ( oc, ehdrC, shdr,
3602 shnum, stab, strtab );
3607 /* Free the local symbol table; we won't need it again. */
3608 freeHashTable(oc->lochash, NULL);
3611 #if defined(powerpc_HOST_ARCH)
3612 ocFlushInstructionCache( oc );
3620 * Instructions are 41 bits long, packed into 128 bit bundles with a 5-bit template
3621 * at the front. The following utility functions pack and unpack instructions, and
3622 * take care of the most common relocations.
3625 #ifdef ia64_HOST_ARCH
3628 ia64_extract_instruction(Elf64_Xword *target)
3631 int slot = (Elf_Addr)target & 3;
3632 target = (Elf_Addr)target & ~3;
3640 return ((w1 >> 5) & 0x1ffffffffff);
3642 return (w1 >> 46) | ((w2 & 0x7fffff) << 18);
3646 barf("ia64_extract_instruction: invalid slot %p", target);
3651 ia64_deposit_instruction(Elf64_Xword *target, Elf64_Xword value)
3653 int slot = (Elf_Addr)target & 3;
3654 target = (Elf_Addr)target & ~3;
3659 *target |= value << 5;
3662 *target |= value << 46;
3663 *(target+1) |= value >> 18;
3666 *(target+1) |= value << 23;
3672 ia64_reloc_gprel22(Elf_Addr target, Elf_Addr value)
3674 Elf64_Xword instruction;
3675 Elf64_Sxword rel_value;
3677 rel_value = value - gp_val;
3678 if ((rel_value > 0x1fffff) || (rel_value < -0x1fffff))
3679 barf("GP-relative data out of range (address = 0x%lx, gp = 0x%lx)", value, gp_val);
3681 instruction = ia64_extract_instruction((Elf64_Xword *)target);
3682 instruction |= (((rel_value >> 0) & 0x07f) << 13) /* imm7b */
3683 | (((rel_value >> 7) & 0x1ff) << 27) /* imm9d */
3684 | (((rel_value >> 16) & 0x01f) << 22) /* imm5c */
3685 | ((Elf64_Xword)(rel_value < 0) << 36); /* s */
3686 ia64_deposit_instruction((Elf64_Xword *)target, instruction);
3690 ia64_reloc_pcrel21(Elf_Addr target, Elf_Addr value, ObjectCode *oc)
3692 Elf64_Xword instruction;
3693 Elf64_Sxword rel_value;
3696 entry = allocatePLTEntry(value, oc);
3698 rel_value = (entry >> 4) - (target >> 4);
3699 if ((rel_value > 0xfffff) || (rel_value < -0xfffff))
3700 barf("PLT entry too far away (entry = 0x%lx, target = 0x%lx)", entry, target);
3702 instruction = ia64_extract_instruction((Elf64_Xword *)target);
3703 instruction |= ((rel_value & 0xfffff) << 13) /* imm20b */
3704 | ((Elf64_Xword)(rel_value < 0) << 36); /* s */
3705 ia64_deposit_instruction((Elf64_Xword *)target, instruction);
3711 * PowerPC ELF specifics
3714 #ifdef powerpc_HOST_ARCH
3716 static int ocAllocateJumpIslands_ELF( ObjectCode *oc )
3722 ehdr = (Elf_Ehdr *) oc->image;
3723 shdr = (Elf_Shdr *) ( ((char *)oc->image) + ehdr->e_shoff );
3725 for( i = 0; i < ehdr->e_shnum; i++ )
3726 if( shdr[i].sh_type == SHT_SYMTAB )
3729 if( i == ehdr->e_shnum )
3731 errorBelch( "This ELF file contains no symtab" );
3735 if( shdr[i].sh_entsize != sizeof( Elf_Sym ) )
3737 errorBelch( "The entry size (%d) of the symtab isn't %d\n",
3738 shdr[i].sh_entsize, sizeof( Elf_Sym ) );
3743 return ocAllocateJumpIslands( oc, shdr[i].sh_size / sizeof( Elf_Sym ), 0 );
3746 #endif /* powerpc */
3750 /* --------------------------------------------------------------------------
3752 * ------------------------------------------------------------------------*/
3754 #if defined(OBJFORMAT_MACHO)
3757 Support for MachO linking on Darwin/MacOS X
3758 by Wolfgang Thaller (wolfgang.thaller@gmx.net)
3760 I hereby formally apologize for the hackish nature of this code.
3761 Things that need to be done:
3762 *) implement ocVerifyImage_MachO
3763 *) add still more sanity checks.
3766 #ifdef powerpc_HOST_ARCH
3767 static int ocAllocateJumpIslands_MachO(ObjectCode* oc)
3769 struct mach_header *header = (struct mach_header *) oc->image;
3770 struct load_command *lc = (struct load_command *) (header + 1);
3773 for( i = 0; i < header->ncmds; i++ )
3775 if( lc->cmd == LC_SYMTAB )
3777 // Find out the first and last undefined external
3778 // symbol, so we don't have to allocate too many
3780 struct symtab_command *symLC = (struct symtab_command *) lc;
3781 unsigned min = symLC->nsyms, max = 0;
3782 struct nlist *nlist =
3783 symLC ? (struct nlist*) ((char*) oc->image + symLC->symoff)
3785 for(i=0;i<symLC->nsyms;i++)
3787 if(nlist[i].n_type & N_STAB)
3789 else if(nlist[i].n_type & N_EXT)
3791 if((nlist[i].n_type & N_TYPE) == N_UNDF
3792 && (nlist[i].n_value == 0))
3802 return ocAllocateJumpIslands(oc, max - min + 1, min);
3807 lc = (struct load_command *) ( ((char *)lc) + lc->cmdsize );
3809 return ocAllocateJumpIslands(oc,0,0);
3813 static int ocVerifyImage_MachO(ObjectCode* oc STG_UNUSED)
3815 // FIXME: do some verifying here
3819 static int resolveImports(
3822 struct symtab_command *symLC,
3823 struct section *sect, // ptr to lazy or non-lazy symbol pointer section
3824 unsigned long *indirectSyms,
3825 struct nlist *nlist)
3828 size_t itemSize = 4;
3831 int isJumpTable = 0;
3832 if(!strcmp(sect->sectname,"__jump_table"))
3836 ASSERT(sect->reserved2 == itemSize);
3840 for(i=0; i*itemSize < sect->size;i++)
3842 // according to otool, reserved1 contains the first index into the indirect symbol table
3843 struct nlist *symbol = &nlist[indirectSyms[sect->reserved1+i]];
3844 char *nm = image + symLC->stroff + symbol->n_un.n_strx;
3847 if((symbol->n_type & N_TYPE) == N_UNDF
3848 && (symbol->n_type & N_EXT) && (symbol->n_value != 0))
3849 addr = (void*) (symbol->n_value);
3850 else if((addr = lookupLocalSymbol(oc,nm)) != NULL)
3853 addr = lookupSymbol(nm);
3856 errorBelch("\n%s: unknown symbol `%s'", oc->fileName, nm);
3864 checkProddableBlock(oc,image + sect->offset + i*itemSize);
3865 *(image + sect->offset + i*itemSize) = 0xe9; // jmp
3866 *(unsigned*)(image + sect->offset + i*itemSize + 1)
3867 = (char*)addr - (image + sect->offset + i*itemSize + 5);
3872 checkProddableBlock(oc,((void**)(image + sect->offset)) + i);
3873 ((void**)(image + sect->offset))[i] = addr;
3880 static unsigned long relocateAddress(
3883 struct section* sections,
3884 unsigned long address)
3887 for(i = 0; i < nSections; i++)
3889 if(sections[i].addr <= address
3890 && address < sections[i].addr + sections[i].size)
3892 return (unsigned long)oc->image
3893 + sections[i].offset + address - sections[i].addr;
3896 barf("Invalid Mach-O file:"
3897 "Address out of bounds while relocating object file");
3901 static int relocateSection(
3904 struct symtab_command *symLC, struct nlist *nlist,
3905 int nSections, struct section* sections, struct section *sect)
3907 struct relocation_info *relocs;
3910 if(!strcmp(sect->sectname,"__la_symbol_ptr"))
3912 else if(!strcmp(sect->sectname,"__nl_symbol_ptr"))
3914 else if(!strcmp(sect->sectname,"__la_sym_ptr2"))
3916 else if(!strcmp(sect->sectname,"__la_sym_ptr3"))
3920 relocs = (struct relocation_info*) (image + sect->reloff);
3924 if(relocs[i].r_address & R_SCATTERED)
3926 struct scattered_relocation_info *scat =
3927 (struct scattered_relocation_info*) &relocs[i];
3931 if(scat->r_length == 2)
3933 unsigned long word = 0;
3934 unsigned long* wordPtr = (unsigned long*) (image + sect->offset + scat->r_address);
3935 checkProddableBlock(oc,wordPtr);
3937 // Note on relocation types:
3938 // i386 uses the GENERIC_RELOC_* types,
3939 // while ppc uses special PPC_RELOC_* types.
3940 // *_RELOC_VANILLA and *_RELOC_PAIR have the same value
3941 // in both cases, all others are different.
3942 // Therefore, we use GENERIC_RELOC_VANILLA
3943 // and GENERIC_RELOC_PAIR instead of the PPC variants,
3944 // and use #ifdefs for the other types.
3946 // Step 1: Figure out what the relocated value should be
3947 if(scat->r_type == GENERIC_RELOC_VANILLA)
3949 word = *wordPtr + (unsigned long) relocateAddress(
3956 #ifdef powerpc_HOST_ARCH
3957 else if(scat->r_type == PPC_RELOC_SECTDIFF
3958 || scat->r_type == PPC_RELOC_LO16_SECTDIFF
3959 || scat->r_type == PPC_RELOC_HI16_SECTDIFF
3960 || scat->r_type == PPC_RELOC_HA16_SECTDIFF)
3962 else if(scat->r_type == GENERIC_RELOC_SECTDIFF)
3965 struct scattered_relocation_info *pair =
3966 (struct scattered_relocation_info*) &relocs[i+1];
3968 if(!pair->r_scattered || pair->r_type != GENERIC_RELOC_PAIR)
3969 barf("Invalid Mach-O file: "
3970 "RELOC_*_SECTDIFF not followed by RELOC_PAIR");
3972 word = (unsigned long)
3973 (relocateAddress(oc, nSections, sections, scat->r_value)
3974 - relocateAddress(oc, nSections, sections, pair->r_value));
3977 #ifdef powerpc_HOST_ARCH
3978 else if(scat->r_type == PPC_RELOC_HI16
3979 || scat->r_type == PPC_RELOC_LO16
3980 || scat->r_type == PPC_RELOC_HA16
3981 || scat->r_type == PPC_RELOC_LO14)
3982 { // these are generated by label+offset things
3983 struct relocation_info *pair = &relocs[i+1];
3984 if((pair->r_address & R_SCATTERED) || pair->r_type != PPC_RELOC_PAIR)
3985 barf("Invalid Mach-O file: "
3986 "PPC_RELOC_* not followed by PPC_RELOC_PAIR");
3988 if(scat->r_type == PPC_RELOC_LO16)
3990 word = ((unsigned short*) wordPtr)[1];
3991 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
3993 else if(scat->r_type == PPC_RELOC_LO14)
3995 barf("Unsupported Relocation: PPC_RELOC_LO14");
3996 word = ((unsigned short*) wordPtr)[1] & 0xFFFC;
3997 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
3999 else if(scat->r_type == PPC_RELOC_HI16)
4001 word = ((unsigned short*) wordPtr)[1] << 16;
4002 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF);
4004 else if(scat->r_type == PPC_RELOC_HA16)
4006 word = ((unsigned short*) wordPtr)[1] << 16;
4007 word += ((short)relocs[i+1].r_address & (short)0xFFFF);
4011 word += (unsigned long) relocateAddress(oc, nSections, sections, scat->r_value)
4018 continue; // ignore the others
4020 #ifdef powerpc_HOST_ARCH
4021 if(scat->r_type == GENERIC_RELOC_VANILLA
4022 || scat->r_type == PPC_RELOC_SECTDIFF)
4024 if(scat->r_type == GENERIC_RELOC_VANILLA
4025 || scat->r_type == GENERIC_RELOC_SECTDIFF)
4030 #ifdef powerpc_HOST_ARCH
4031 else if(scat->r_type == PPC_RELOC_LO16_SECTDIFF || scat->r_type == PPC_RELOC_LO16)
4033 ((unsigned short*) wordPtr)[1] = word & 0xFFFF;
4035 else if(scat->r_type == PPC_RELOC_HI16_SECTDIFF || scat->r_type == PPC_RELOC_HI16)
4037 ((unsigned short*) wordPtr)[1] = (word >> 16) & 0xFFFF;
4039 else if(scat->r_type == PPC_RELOC_HA16_SECTDIFF || scat->r_type == PPC_RELOC_HA16)
4041 ((unsigned short*) wordPtr)[1] = ((word >> 16) & 0xFFFF)
4042 + ((word & (1<<15)) ? 1 : 0);
4048 continue; // FIXME: I hope it's OK to ignore all the others.
4052 struct relocation_info *reloc = &relocs[i];
4053 if(reloc->r_pcrel && !reloc->r_extern)
4056 if(reloc->r_length == 2)
4058 unsigned long word = 0;
4059 #ifdef powerpc_HOST_ARCH
4060 unsigned long jumpIsland = 0;
4061 long offsetToJumpIsland = 0xBADBAD42; // initialise to bad value
4062 // to avoid warning and to catch
4066 unsigned long* wordPtr = (unsigned long*) (image + sect->offset + reloc->r_address);
4067 checkProddableBlock(oc,wordPtr);
4069 if(reloc->r_type == GENERIC_RELOC_VANILLA)
4073 #ifdef powerpc_HOST_ARCH
4074 else if(reloc->r_type == PPC_RELOC_LO16)
4076 word = ((unsigned short*) wordPtr)[1];
4077 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
4079 else if(reloc->r_type == PPC_RELOC_HI16)
4081 word = ((unsigned short*) wordPtr)[1] << 16;
4082 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF);
4084 else if(reloc->r_type == PPC_RELOC_HA16)
4086 word = ((unsigned short*) wordPtr)[1] << 16;
4087 word += ((short)relocs[i+1].r_address & (short)0xFFFF);
4089 else if(reloc->r_type == PPC_RELOC_BR24)
4092 word = (word & 0x03FFFFFC) | ((word & 0x02000000) ? 0xFC000000 : 0);
4096 if(!reloc->r_extern)
4099 sections[reloc->r_symbolnum-1].offset
4100 - sections[reloc->r_symbolnum-1].addr
4107 struct nlist *symbol = &nlist[reloc->r_symbolnum];
4108 char *nm = image + symLC->stroff + symbol->n_un.n_strx;
4109 void *symbolAddress = lookupSymbol(nm);
4112 errorBelch("\nunknown symbol `%s'", nm);
4118 #ifdef powerpc_HOST_ARCH
4119 // In the .o file, this should be a relative jump to NULL
4120 // and we'll change it to a relative jump to the symbol
4121 ASSERT(-word == reloc->r_address);
4122 jumpIsland = makeJumpIsland(oc,reloc->r_symbolnum,(unsigned long) symbolAddress);
4125 offsetToJumpIsland = word + jumpIsland
4126 - (((long)image) + sect->offset - sect->addr);
4129 word += (unsigned long) symbolAddress
4130 - (((long)image) + sect->offset - sect->addr);
4134 word += (unsigned long) symbolAddress;
4138 if(reloc->r_type == GENERIC_RELOC_VANILLA)
4143 #ifdef powerpc_HOST_ARCH
4144 else if(reloc->r_type == PPC_RELOC_LO16)
4146 ((unsigned short*) wordPtr)[1] = word & 0xFFFF;
4149 else if(reloc->r_type == PPC_RELOC_HI16)
4151 ((unsigned short*) wordPtr)[1] = (word >> 16) & 0xFFFF;
4154 else if(reloc->r_type == PPC_RELOC_HA16)
4156 ((unsigned short*) wordPtr)[1] = ((word >> 16) & 0xFFFF)
4157 + ((word & (1<<15)) ? 1 : 0);
4160 else if(reloc->r_type == PPC_RELOC_BR24)
4162 if((long)word > (long)0x01FFFFFF || (long)word < (long)0xFFE00000)
4164 // The branch offset is too large.
4165 // Therefore, we try to use a jump island.
4168 barf("unconditional relative branch out of range: "
4169 "no jump island available");
4172 word = offsetToJumpIsland;
4173 if((long)word > (long)0x01FFFFFF || (long)word < (long)0xFFE00000)
4174 barf("unconditional relative branch out of range: "
4175 "jump island out of range");
4177 *wordPtr = (*wordPtr & 0xFC000003) | (word & 0x03FFFFFC);
4182 barf("\nunknown relocation %d",reloc->r_type);
4189 static int ocGetNames_MachO(ObjectCode* oc)
4191 char *image = (char*) oc->image;
4192 struct mach_header *header = (struct mach_header*) image;
4193 struct load_command *lc = (struct load_command*) (image + sizeof(struct mach_header));
4194 unsigned i,curSymbol = 0;
4195 struct segment_command *segLC = NULL;
4196 struct section *sections;
4197 struct symtab_command *symLC = NULL;
4198 struct nlist *nlist;
4199 unsigned long commonSize = 0;
4200 char *commonStorage = NULL;
4201 unsigned long commonCounter;
4203 for(i=0;i<header->ncmds;i++)
4205 if(lc->cmd == LC_SEGMENT)
4206 segLC = (struct segment_command*) lc;
4207 else if(lc->cmd == LC_SYMTAB)
4208 symLC = (struct symtab_command*) lc;
4209 lc = (struct load_command *) ( ((char*)lc) + lc->cmdsize );
4212 sections = (struct section*) (segLC+1);
4213 nlist = symLC ? (struct nlist*) (image + symLC->symoff)
4216 for(i=0;i<segLC->nsects;i++)
4218 if(sections[i].size == 0)
4221 if((sections[i].flags & SECTION_TYPE) == S_ZEROFILL)
4223 char * zeroFillArea = stgCallocBytes(1,sections[i].size,
4224 "ocGetNames_MachO(common symbols)");
4225 sections[i].offset = zeroFillArea - image;
4228 if(!strcmp(sections[i].sectname,"__text"))
4229 addSection(oc, SECTIONKIND_CODE_OR_RODATA,
4230 (void*) (image + sections[i].offset),
4231 (void*) (image + sections[i].offset + sections[i].size));
4232 else if(!strcmp(sections[i].sectname,"__const"))
4233 addSection(oc, SECTIONKIND_RWDATA,
4234 (void*) (image + sections[i].offset),
4235 (void*) (image + sections[i].offset + sections[i].size));
4236 else if(!strcmp(sections[i].sectname,"__data"))
4237 addSection(oc, SECTIONKIND_RWDATA,
4238 (void*) (image + sections[i].offset),
4239 (void*) (image + sections[i].offset + sections[i].size));
4240 else if(!strcmp(sections[i].sectname,"__bss")
4241 || !strcmp(sections[i].sectname,"__common"))
4242 addSection(oc, SECTIONKIND_RWDATA,
4243 (void*) (image + sections[i].offset),
4244 (void*) (image + sections[i].offset + sections[i].size));
4246 addProddableBlock(oc, (void*) (image + sections[i].offset),
4250 // count external symbols defined here
4254 for(i=0;i<symLC->nsyms;i++)
4256 if(nlist[i].n_type & N_STAB)
4258 else if(nlist[i].n_type & N_EXT)
4260 if((nlist[i].n_type & N_TYPE) == N_UNDF
4261 && (nlist[i].n_value != 0))
4263 commonSize += nlist[i].n_value;
4266 else if((nlist[i].n_type & N_TYPE) == N_SECT)
4271 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
4272 "ocGetNames_MachO(oc->symbols)");
4276 for(i=0;i<symLC->nsyms;i++)
4278 if(nlist[i].n_type & N_STAB)
4280 else if((nlist[i].n_type & N_TYPE) == N_SECT)
4282 if(nlist[i].n_type & N_EXT)
4284 char *nm = image + symLC->stroff + nlist[i].n_un.n_strx;
4285 ghciInsertStrHashTable(oc->fileName, symhash, nm,
4287 + sections[nlist[i].n_sect-1].offset
4288 - sections[nlist[i].n_sect-1].addr
4289 + nlist[i].n_value);
4290 oc->symbols[curSymbol++] = nm;
4294 char *nm = image + symLC->stroff + nlist[i].n_un.n_strx;
4295 ghciInsertStrHashTable(oc->fileName, oc->lochash, nm,
4297 + sections[nlist[i].n_sect-1].offset
4298 - sections[nlist[i].n_sect-1].addr
4299 + nlist[i].n_value);
4305 commonStorage = stgCallocBytes(1,commonSize,"ocGetNames_MachO(common symbols)");
4306 commonCounter = (unsigned long)commonStorage;
4309 for(i=0;i<symLC->nsyms;i++)
4311 if((nlist[i].n_type & N_TYPE) == N_UNDF
4312 && (nlist[i].n_type & N_EXT) && (nlist[i].n_value != 0))
4314 char *nm = image + symLC->stroff + nlist[i].n_un.n_strx;
4315 unsigned long sz = nlist[i].n_value;
4317 nlist[i].n_value = commonCounter;
4319 ghciInsertStrHashTable(oc->fileName, symhash, nm,
4320 (void*)commonCounter);
4321 oc->symbols[curSymbol++] = nm;
4323 commonCounter += sz;
4330 static int ocResolve_MachO(ObjectCode* oc)
4332 char *image = (char*) oc->image;
4333 struct mach_header *header = (struct mach_header*) image;
4334 struct load_command *lc = (struct load_command*) (image + sizeof(struct mach_header));
4336 struct segment_command *segLC = NULL;
4337 struct section *sections;
4338 struct symtab_command *symLC = NULL;
4339 struct dysymtab_command *dsymLC = NULL;
4340 struct nlist *nlist;
4342 for(i=0;i<header->ncmds;i++)
4344 if(lc->cmd == LC_SEGMENT)
4345 segLC = (struct segment_command*) lc;
4346 else if(lc->cmd == LC_SYMTAB)
4347 symLC = (struct symtab_command*) lc;
4348 else if(lc->cmd == LC_DYSYMTAB)
4349 dsymLC = (struct dysymtab_command*) lc;
4350 lc = (struct load_command *) ( ((char*)lc) + lc->cmdsize );
4353 sections = (struct section*) (segLC+1);
4354 nlist = symLC ? (struct nlist*) (image + symLC->symoff)
4359 unsigned long *indirectSyms
4360 = (unsigned long*) (image + dsymLC->indirectsymoff);
4362 for(i=0;i<segLC->nsects;i++)
4364 if( !strcmp(sections[i].sectname,"__la_symbol_ptr")
4365 || !strcmp(sections[i].sectname,"__la_sym_ptr2")
4366 || !strcmp(sections[i].sectname,"__la_sym_ptr3"))
4368 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4371 else if(!strcmp(sections[i].sectname,"__nl_symbol_ptr")
4372 || !strcmp(sections[i].sectname,"__pointers"))
4374 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4377 else if(!strcmp(sections[i].sectname,"__jump_table"))
4379 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4385 for(i=0;i<segLC->nsects;i++)
4387 if(!relocateSection(oc,image,symLC,nlist,segLC->nsects,sections,§ions[i]))
4391 /* Free the local symbol table; we won't need it again. */
4392 freeHashTable(oc->lochash, NULL);
4395 #if defined (powerpc_HOST_ARCH)
4396 ocFlushInstructionCache( oc );
4402 #ifdef powerpc_HOST_ARCH
4404 * The Mach-O object format uses leading underscores. But not everywhere.
4405 * There is a small number of runtime support functions defined in
4406 * libcc_dynamic.a whose name does not have a leading underscore.
4407 * As a consequence, we can't get their address from C code.
4408 * We have to use inline assembler just to take the address of a function.
4412 static void machoInitSymbolsWithoutUnderscore()
4414 extern void* symbolsWithoutUnderscore[];
4415 void **p = symbolsWithoutUnderscore;
4416 __asm__ volatile(".globl _symbolsWithoutUnderscore\n.data\n_symbolsWithoutUnderscore:");
4420 __asm__ volatile(".long " # x);
4422 RTS_MACHO_NOUNDERLINE_SYMBOLS
4424 __asm__ volatile(".text");
4428 ghciInsertStrHashTable("(GHCi built-in symbols)", symhash, #x, *p++);
4430 RTS_MACHO_NOUNDERLINE_SYMBOLS
4437 * Figure out by how much to shift the entire Mach-O file in memory
4438 * when loading so that its single segment ends up 16-byte-aligned
4440 static int machoGetMisalignment( FILE * f )
4442 struct mach_header header;
4445 fread(&header, sizeof(header), 1, f);
4448 if(header.magic != MH_MAGIC)
4451 misalignment = (header.sizeofcmds + sizeof(header))
4454 return misalignment ? (16 - misalignment) : 0;