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) \
492 SymX(closure_flags) \
494 SymX(cmpIntegerzh_fast) \
495 SymX(cmpIntegerIntzh_fast) \
496 SymX(complementIntegerzh_fast) \
497 SymX(createAdjustor) \
498 SymX(decodeDoublezh_fast) \
499 SymX(decodeFloatzh_fast) \
502 SymX(deRefWeakzh_fast) \
503 SymX(deRefStablePtrzh_fast) \
504 SymX(dirty_MUT_VAR) \
505 SymX(divExactIntegerzh_fast) \
506 SymX(divModIntegerzh_fast) \
508 SymX(forkOnzh_fast) \
510 SymX(forkOS_createThread) \
511 SymX(freeHaskellFunctionPtr) \
512 SymX(freeStablePtr) \
513 SymX(getOrSetTypeableStore) \
514 SymX(gcdIntegerzh_fast) \
515 SymX(gcdIntegerIntzh_fast) \
516 SymX(gcdIntzh_fast) \
525 SymX(hs_perform_gc) \
526 SymX(hs_free_stable_ptr) \
527 SymX(hs_free_fun_ptr) \
529 SymX(int2Integerzh_fast) \
530 SymX(integer2Intzh_fast) \
531 SymX(integer2Wordzh_fast) \
532 SymX(isCurrentThreadBoundzh_fast) \
533 SymX(isDoubleDenormalized) \
534 SymX(isDoubleInfinite) \
536 SymX(isDoubleNegativeZero) \
537 SymX(isEmptyMVarzh_fast) \
538 SymX(isFloatDenormalized) \
539 SymX(isFloatInfinite) \
541 SymX(isFloatNegativeZero) \
542 SymX(killThreadzh_fast) \
544 SymX(insertStableSymbol) \
547 SymX(makeStablePtrzh_fast) \
548 SymX(minusIntegerzh_fast) \
549 SymX(mkApUpd0zh_fast) \
550 SymX(myThreadIdzh_fast) \
551 SymX(labelThreadzh_fast) \
552 SymX(newArrayzh_fast) \
553 SymX(newBCOzh_fast) \
554 SymX(newByteArrayzh_fast) \
555 SymX_redirect(newCAF, newDynCAF) \
556 SymX(newMVarzh_fast) \
557 SymX(newMutVarzh_fast) \
558 SymX(newTVarzh_fast) \
559 SymX(atomicModifyMutVarzh_fast) \
560 SymX(newPinnedByteArrayzh_fast) \
562 SymX(orIntegerzh_fast) \
564 SymX(performMajorGC) \
565 SymX(plusIntegerzh_fast) \
568 SymX(putMVarzh_fast) \
569 SymX(quotIntegerzh_fast) \
570 SymX(quotRemIntegerzh_fast) \
572 SymX(raiseIOzh_fast) \
573 SymX(readTVarzh_fast) \
574 SymX(remIntegerzh_fast) \
575 SymX(resetNonBlockingFd) \
580 SymX(rts_checkSchedStatus) \
583 SymX(rts_evalLazyIO) \
584 SymX(rts_evalStableIO) \
588 SymX(rts_getDouble) \
593 SymX(rts_getFunPtr) \
594 SymX(rts_getStablePtr) \
595 SymX(rts_getThreadId) \
597 SymX(rts_getWord32) \
610 SymX(rts_mkStablePtr) \
618 SymX(rtsSupportsBoundThreads) \
619 SymX(__hscore_get_saved_termios) \
620 SymX(__hscore_set_saved_termios) \
622 SymX(startupHaskell) \
623 SymX(shutdownHaskell) \
624 SymX(shutdownHaskellAndExit) \
625 SymX(stable_ptr_table) \
626 SymX(stackOverflow) \
627 SymX(stg_CAF_BLACKHOLE_info) \
628 SymX(awakenBlockedQueue) \
629 SymX(stg_CHARLIKE_closure) \
630 SymX(stg_EMPTY_MVAR_info) \
631 SymX(stg_IND_STATIC_info) \
632 SymX(stg_INTLIKE_closure) \
633 SymX(stg_MUT_ARR_PTRS_DIRTY_info) \
634 SymX(stg_MUT_ARR_PTRS_FROZEN_info) \
635 SymX(stg_MUT_ARR_PTRS_FROZEN0_info) \
636 SymX(stg_WEAK_info) \
637 SymX(stg_ap_v_info) \
638 SymX(stg_ap_f_info) \
639 SymX(stg_ap_d_info) \
640 SymX(stg_ap_l_info) \
641 SymX(stg_ap_n_info) \
642 SymX(stg_ap_p_info) \
643 SymX(stg_ap_pv_info) \
644 SymX(stg_ap_pp_info) \
645 SymX(stg_ap_ppv_info) \
646 SymX(stg_ap_ppp_info) \
647 SymX(stg_ap_pppv_info) \
648 SymX(stg_ap_pppp_info) \
649 SymX(stg_ap_ppppp_info) \
650 SymX(stg_ap_pppppp_info) \
651 SymX(stg_ap_0_fast) \
652 SymX(stg_ap_v_fast) \
653 SymX(stg_ap_f_fast) \
654 SymX(stg_ap_d_fast) \
655 SymX(stg_ap_l_fast) \
656 SymX(stg_ap_n_fast) \
657 SymX(stg_ap_p_fast) \
658 SymX(stg_ap_pv_fast) \
659 SymX(stg_ap_pp_fast) \
660 SymX(stg_ap_ppv_fast) \
661 SymX(stg_ap_ppp_fast) \
662 SymX(stg_ap_pppv_fast) \
663 SymX(stg_ap_pppp_fast) \
664 SymX(stg_ap_ppppp_fast) \
665 SymX(stg_ap_pppppp_fast) \
666 SymX(stg_ap_1_upd_info) \
667 SymX(stg_ap_2_upd_info) \
668 SymX(stg_ap_3_upd_info) \
669 SymX(stg_ap_4_upd_info) \
670 SymX(stg_ap_5_upd_info) \
671 SymX(stg_ap_6_upd_info) \
672 SymX(stg_ap_7_upd_info) \
674 SymX(stg_sel_0_upd_info) \
675 SymX(stg_sel_10_upd_info) \
676 SymX(stg_sel_11_upd_info) \
677 SymX(stg_sel_12_upd_info) \
678 SymX(stg_sel_13_upd_info) \
679 SymX(stg_sel_14_upd_info) \
680 SymX(stg_sel_15_upd_info) \
681 SymX(stg_sel_1_upd_info) \
682 SymX(stg_sel_2_upd_info) \
683 SymX(stg_sel_3_upd_info) \
684 SymX(stg_sel_4_upd_info) \
685 SymX(stg_sel_5_upd_info) \
686 SymX(stg_sel_6_upd_info) \
687 SymX(stg_sel_7_upd_info) \
688 SymX(stg_sel_8_upd_info) \
689 SymX(stg_sel_9_upd_info) \
690 SymX(stg_upd_frame_info) \
691 SymX(suspendThread) \
692 SymX(takeMVarzh_fast) \
693 SymX(timesIntegerzh_fast) \
694 SymX(tryPutMVarzh_fast) \
695 SymX(tryTakeMVarzh_fast) \
696 SymX(unblockAsyncExceptionszh_fast) \
698 SymX(unsafeThawArrayzh_fast) \
699 SymX(waitReadzh_fast) \
700 SymX(waitWritezh_fast) \
701 SymX(word2Integerzh_fast) \
702 SymX(writeTVarzh_fast) \
703 SymX(xorIntegerzh_fast) \
705 SymX(stg_interp_constr_entry) \
706 SymX(stg_interp_constr1_entry) \
707 SymX(stg_interp_constr2_entry) \
708 SymX(stg_interp_constr3_entry) \
709 SymX(stg_interp_constr4_entry) \
710 SymX(stg_interp_constr5_entry) \
711 SymX(stg_interp_constr6_entry) \
712 SymX(stg_interp_constr7_entry) \
713 SymX(stg_interp_constr8_entry) \
716 SymX(getAllocations) \
719 RTS_USER_SIGNALS_SYMBOLS
721 #ifdef SUPPORT_LONG_LONGS
722 #define RTS_LONG_LONG_SYMS \
723 SymX(int64ToIntegerzh_fast) \
724 SymX(word64ToIntegerzh_fast)
726 #define RTS_LONG_LONG_SYMS /* nothing */
729 // 64-bit support functions in libgcc.a
730 #if defined(__GNUC__) && SIZEOF_VOID_P <= 4
731 #define RTS_LIBGCC_SYMBOLS \
741 #elif defined(ia64_HOST_ARCH)
742 #define RTS_LIBGCC_SYMBOLS \
750 #define RTS_LIBGCC_SYMBOLS
753 #if defined(darwin_HOST_OS) && defined(powerpc_HOST_ARCH)
754 // Symbols that don't have a leading underscore
755 // on Mac OS X. They have to receive special treatment,
756 // see machoInitSymbolsWithoutUnderscore()
757 #define RTS_MACHO_NOUNDERLINE_SYMBOLS \
762 /* entirely bogus claims about types of these symbols */
763 #define Sym(vvv) extern void vvv(void);
764 #define SymX(vvv) /**/
765 #define SymX_redirect(vvv,xxx) /**/
769 RTS_POSIX_ONLY_SYMBOLS
770 RTS_MINGW_ONLY_SYMBOLS
771 RTS_CYGWIN_ONLY_SYMBOLS
772 RTS_DARWIN_ONLY_SYMBOLS
778 #ifdef LEADING_UNDERSCORE
779 #define MAYBE_LEADING_UNDERSCORE_STR(s) ("_" s)
781 #define MAYBE_LEADING_UNDERSCORE_STR(s) (s)
784 #define Sym(vvv) { MAYBE_LEADING_UNDERSCORE_STR(#vvv), \
786 #define SymX(vvv) Sym(vvv)
788 // SymX_redirect allows us to redirect references to one symbol to
789 // another symbol. See newCAF/newDynCAF for an example.
790 #define SymX_redirect(vvv,xxx) \
791 { MAYBE_LEADING_UNDERSCORE_STR(#vvv), \
794 static RtsSymbolVal rtsSyms[] = {
798 RTS_POSIX_ONLY_SYMBOLS
799 RTS_MINGW_ONLY_SYMBOLS
800 RTS_CYGWIN_ONLY_SYMBOLS
802 #if defined(darwin_HOST_OS) && defined(i386_HOST_ARCH)
803 // dyld stub code contains references to this,
804 // but it should never be called because we treat
805 // lazy pointers as nonlazy.
806 { "dyld_stub_binding_helper", (void*)0xDEADBEEF },
808 { 0, 0 } /* sentinel */
812 /* -----------------------------------------------------------------------------
813 * Utilities for handling root pointers.
814 * -------------------------------------------------------------------------- */
817 #define INIT_RPT_SIZE 64
820 initFreeList(rootEntry *table, nat n, rootEntry *free)
824 for (p = table + n - 1; p >= table; p--) {
828 root_ptr_free = table;
832 initRootPtrTable(void)
837 RPT_size = INIT_RPT_SIZE;
838 root_ptr_table = stgMallocBytes(RPT_size * sizeof(rootEntry),
841 initFreeList(root_ptr_table,INIT_RPT_SIZE,NULL);
846 enlargeRootPtrTable(void)
848 nat old_RPT_size = RPT_size;
850 // 2nd and subsequent times
853 stgReallocBytes(root_ptr_table,
854 RPT_size * sizeof(rootEntry),
855 "enlargeRootPtrTable");
857 initFreeList(root_ptr_table + old_RPT_size, old_RPT_size, NULL);
861 addRootObject(void *addr)
865 if (root_ptr_free == NULL) {
866 enlargeRootPtrTable();
869 rt = root_ptr_free - root_ptr_table;
870 root_ptr_free = (rootEntry*)(root_ptr_free->addr);
871 root_ptr_table[rt].addr = addr;
874 /* -----------------------------------------------------------------------------
875 * Treat root pointers as roots for the garbage collector.
876 * -------------------------------------------------------------------------- */
879 markRootPtrTable(evac_fn evac)
881 rootEntry *p, *end_root_ptr_table;
884 end_root_ptr_table = &root_ptr_table[RPT_size];
886 for (p = root_ptr_table; p < end_root_ptr_table; p++) {
889 if (q && (q < (P_)root_ptr_table || q >= (P_)end_root_ptr_table)) {
890 evac((StgClosure **)p->addr);
895 /* -----------------------------------------------------------------------------
896 * End of utilities for handling root pointers.
897 * -------------------------------------------------------------------------- */
900 /* -----------------------------------------------------------------------------
901 * Insert symbols into hash tables, checking for duplicates.
903 static void ghciInsertStrHashTable ( char* obj_name,
909 if (lookupHashTable(table, (StgWord)key) == NULL)
911 insertStrHashTable(table, (StgWord)key, data);
916 "GHCi runtime linker: fatal error: I found a duplicate definition for symbol\n"
918 "whilst processing object file\n"
920 "This could be caused by:\n"
921 " * Loading two different object files which export the same symbol\n"
922 " * Specifying the same object file twice on the GHCi command line\n"
923 " * An incorrect `package.conf' entry, causing some object to be\n"
925 "GHCi cannot safely continue in this situation. Exiting now. Sorry.\n"
934 /* -----------------------------------------------------------------------------
935 * initialize the object linker
939 static int linker_init_done = 0 ;
941 #if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
942 static void *dl_prog_handle;
950 /* Make initLinker idempotent, so we can call it
951 before evey relevant operation; that means we
952 don't need to initialise the linker separately */
953 if (linker_init_done == 1) { return; } else {
954 linker_init_done = 1;
957 stablehash = allocStrHashTable();
958 symhash = allocStrHashTable();
960 /* populate the symbol table with stuff from the RTS */
961 for (sym = rtsSyms; sym->lbl != NULL; sym++) {
962 ghciInsertStrHashTable("(GHCi built-in symbols)",
963 symhash, sym->lbl, sym->addr);
965 # if defined(OBJFORMAT_MACHO) && defined(powerpc_HOST_ARCH)
966 machoInitSymbolsWithoutUnderscore();
969 # if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
970 # if defined(RTLD_DEFAULT)
971 dl_prog_handle = RTLD_DEFAULT;
973 dl_prog_handle = dlopen(NULL, RTLD_LAZY);
974 # endif /* RTLD_DEFAULT */
978 /* -----------------------------------------------------------------------------
979 * Loading DLL or .so dynamic libraries
980 * -----------------------------------------------------------------------------
982 * Add a DLL from which symbols may be found. In the ELF case, just
983 * do RTLD_GLOBAL-style add, so no further messing around needs to
984 * happen in order that symbols in the loaded .so are findable --
985 * lookupSymbol() will subsequently see them by dlsym on the program's
986 * dl-handle. Returns NULL if success, otherwise ptr to an err msg.
988 * In the PEi386 case, open the DLLs and put handles to them in a
989 * linked list. When looking for a symbol, try all handles in the
990 * list. This means that we need to load even DLLs that are guaranteed
991 * to be in the ghc.exe image already, just so we can get a handle
992 * to give to loadSymbol, so that we can find the symbols. For such
993 * libraries, the LoadLibrary call should be a no-op except for returning
998 #if defined(OBJFORMAT_PEi386)
999 /* A record for storing handles into DLLs. */
1004 struct _OpenedDLL* next;
1009 /* A list thereof. */
1010 static OpenedDLL* opened_dlls = NULL;
1014 addDLL( char *dll_name )
1016 # if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
1017 /* ------------------- ELF DLL loader ------------------- */
1023 hdl= dlopen(dll_name, RTLD_NOW | RTLD_GLOBAL);
1026 /* dlopen failed; return a ptr to the error msg. */
1028 if (errmsg == NULL) errmsg = "addDLL: unknown error";
1035 # elif defined(OBJFORMAT_PEi386)
1036 /* ------------------- Win32 DLL loader ------------------- */
1044 /* debugBelch("\naddDLL; dll_name = `%s'\n", dll_name); */
1046 /* See if we've already got it, and ignore if so. */
1047 for (o_dll = opened_dlls; o_dll != NULL; o_dll = o_dll->next) {
1048 if (0 == strcmp(o_dll->name, dll_name))
1052 /* The file name has no suffix (yet) so that we can try
1053 both foo.dll and foo.drv
1055 The documentation for LoadLibrary says:
1056 If no file name extension is specified in the lpFileName
1057 parameter, the default library extension .dll is
1058 appended. However, the file name string can include a trailing
1059 point character (.) to indicate that the module name has no
1062 buf = stgMallocBytes(strlen(dll_name) + 10, "addDLL");
1063 sprintf(buf, "%s.DLL", dll_name);
1064 instance = LoadLibrary(buf);
1065 if (instance == NULL) {
1066 sprintf(buf, "%s.DRV", dll_name); // KAA: allow loading of drivers (like winspool.drv)
1067 instance = LoadLibrary(buf);
1068 if (instance == NULL) {
1071 /* LoadLibrary failed; return a ptr to the error msg. */
1072 return "addDLL: unknown error";
1077 /* Add this DLL to the list of DLLs in which to search for symbols. */
1078 o_dll = stgMallocBytes( sizeof(OpenedDLL), "addDLL" );
1079 o_dll->name = stgMallocBytes(1+strlen(dll_name), "addDLL");
1080 strcpy(o_dll->name, dll_name);
1081 o_dll->instance = instance;
1082 o_dll->next = opened_dlls;
1083 opened_dlls = o_dll;
1087 barf("addDLL: not implemented on this platform");
1091 /* -----------------------------------------------------------------------------
1092 * insert a stable symbol in the hash table
1096 insertStableSymbol(char* obj_name, char* key, StgPtr p)
1098 ghciInsertStrHashTable(obj_name, stablehash, key, getStablePtr(p));
1102 /* -----------------------------------------------------------------------------
1103 * insert a symbol in the hash table
1106 insertSymbol(char* obj_name, char* key, void* data)
1108 ghciInsertStrHashTable(obj_name, symhash, key, data);
1111 /* -----------------------------------------------------------------------------
1112 * lookup a symbol in the hash table
1115 lookupSymbol( char *lbl )
1119 ASSERT(symhash != NULL);
1120 val = lookupStrHashTable(symhash, lbl);
1123 # if defined(OBJFORMAT_ELF)
1124 # if defined(x86_64_HOST_ARCH)
1125 val = dlsym(dl_prog_handle, lbl);
1126 if (val >= (void *)0x80000000) {
1128 new_val = x86_64_high_symbol(lbl, val);
1129 IF_DEBUG(linker,debugBelch("lookupSymbol: relocating out of range symbol: %s = %p, now %p\n", lbl, val, new_val));
1135 return dlsym(dl_prog_handle, lbl);
1137 # elif defined(OBJFORMAT_MACHO)
1138 if(NSIsSymbolNameDefined(lbl)) {
1139 NSSymbol symbol = NSLookupAndBindSymbol(lbl);
1140 return NSAddressOfSymbol(symbol);
1144 # elif defined(OBJFORMAT_PEi386)
1147 for (o_dll = opened_dlls; o_dll != NULL; o_dll = o_dll->next) {
1148 /* debugBelch("look in %s for %s\n", o_dll->name, lbl); */
1149 if (lbl[0] == '_') {
1150 /* HACK: if the name has an initial underscore, try stripping
1151 it off & look that up first. I've yet to verify whether there's
1152 a Rule that governs whether an initial '_' *should always* be
1153 stripped off when mapping from import lib name to the DLL name.
1155 sym = GetProcAddress(o_dll->instance, (lbl+1));
1157 /*debugBelch("found %s in %s\n", lbl+1,o_dll->name);*/
1161 sym = GetProcAddress(o_dll->instance, lbl);
1163 /*debugBelch("found %s in %s\n", lbl,o_dll->name);*/
1178 __attribute((unused))
1180 lookupLocalSymbol( ObjectCode* oc, char *lbl )
1184 val = lookupStrHashTable(oc->lochash, lbl);
1194 /* -----------------------------------------------------------------------------
1195 * Debugging aid: look in GHCi's object symbol tables for symbols
1196 * within DELTA bytes of the specified address, and show their names.
1199 void ghci_enquire ( char* addr );
1201 void ghci_enquire ( char* addr )
1206 const int DELTA = 64;
1211 for (oc = objects; oc; oc = oc->next) {
1212 for (i = 0; i < oc->n_symbols; i++) {
1213 sym = oc->symbols[i];
1214 if (sym == NULL) continue;
1215 // debugBelch("enquire %p %p\n", sym, oc->lochash);
1217 if (oc->lochash != NULL) {
1218 a = lookupStrHashTable(oc->lochash, sym);
1221 a = lookupStrHashTable(symhash, sym);
1224 // debugBelch("ghci_enquire: can't find %s\n", sym);
1226 else if (addr-DELTA <= a && a <= addr+DELTA) {
1227 debugBelch("%p + %3d == `%s'\n", addr, (int)(a - addr), sym);
1234 #ifdef ia64_HOST_ARCH
1235 static unsigned int PLTSize(void);
1238 /* -----------------------------------------------------------------------------
1239 * Load an obj (populate the global symbol table, but don't resolve yet)
1241 * Returns: 1 if ok, 0 on error.
1244 loadObj( char *path )
1251 void *map_addr = NULL;
1258 /* debugBelch("loadObj %s\n", path ); */
1260 /* Check that we haven't already loaded this object.
1261 Ignore requests to load multiple times */
1265 for (o = objects; o; o = o->next) {
1266 if (0 == strcmp(o->fileName, path)) {
1268 break; /* don't need to search further */
1272 IF_DEBUG(linker, debugBelch(
1273 "GHCi runtime linker: warning: looks like you're trying to load the\n"
1274 "same object file twice:\n"
1276 "GHCi will ignore this, but be warned.\n"
1278 return 1; /* success */
1282 oc = stgMallocBytes(sizeof(ObjectCode), "loadObj(oc)");
1284 # if defined(OBJFORMAT_ELF)
1285 oc->formatName = "ELF";
1286 # elif defined(OBJFORMAT_PEi386)
1287 oc->formatName = "PEi386";
1288 # elif defined(OBJFORMAT_MACHO)
1289 oc->formatName = "Mach-O";
1292 barf("loadObj: not implemented on this platform");
1295 r = stat(path, &st);
1296 if (r == -1) { return 0; }
1298 /* sigh, strdup() isn't a POSIX function, so do it the long way */
1299 oc->fileName = stgMallocBytes( strlen(path)+1, "loadObj" );
1300 strcpy(oc->fileName, path);
1302 oc->fileSize = st.st_size;
1304 oc->sections = NULL;
1305 oc->lochash = allocStrHashTable();
1306 oc->proddables = NULL;
1308 /* chain it onto the list of objects */
1313 #define ROUND_UP(x,size) ((x + size - 1) & ~(size - 1))
1315 /* On many architectures malloc'd memory isn't executable, so we need to use mmap. */
1317 #if defined(openbsd_HOST_OS)
1318 fd = open(path, O_RDONLY, S_IRUSR);
1320 fd = open(path, O_RDONLY);
1323 barf("loadObj: can't open `%s'", path);
1325 pagesize = getpagesize();
1327 #ifdef ia64_HOST_ARCH
1328 /* The PLT needs to be right before the object */
1329 n = ROUND_UP(PLTSize(), pagesize);
1330 oc->plt = mmap(NULL, n, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
1331 if (oc->plt == MAP_FAILED)
1332 barf("loadObj: can't allocate PLT");
1335 map_addr = oc->plt + n;
1338 n = ROUND_UP(oc->fileSize, pagesize);
1340 /* Link objects into the lower 2Gb on x86_64. GHC assumes the
1341 * small memory model on this architecture (see gcc docs,
1344 #ifdef x86_64_HOST_ARCH
1345 #define EXTRA_MAP_FLAGS MAP_32BIT
1347 #define EXTRA_MAP_FLAGS 0
1350 oc->image = mmap(map_addr, n, PROT_EXEC|PROT_READ|PROT_WRITE,
1351 MAP_PRIVATE|EXTRA_MAP_FLAGS, fd, 0);
1352 if (oc->image == MAP_FAILED)
1353 barf("loadObj: can't map `%s'", path);
1357 #else /* !USE_MMAP */
1359 /* load the image into memory */
1360 f = fopen(path, "rb");
1362 barf("loadObj: can't read `%s'", path);
1364 #ifdef darwin_HOST_OS
1365 // In a Mach-O .o file, all sections can and will be misaligned
1366 // if the total size of the headers is not a multiple of the
1367 // desired alignment. This is fine for .o files that only serve
1368 // as input for the static linker, but it's not fine for us,
1369 // as SSE (used by gcc for floating point) and Altivec require
1370 // 16-byte alignment.
1371 // We calculate the correct alignment from the header before
1372 // reading the file, and then we misalign oc->image on purpose so
1373 // that the actual sections end up aligned again.
1374 misalignment = machoGetMisalignment(f);
1375 oc->misalignment = misalignment;
1380 oc->image = stgMallocBytes(oc->fileSize + misalignment, "loadObj(image)");
1381 oc->image += misalignment;
1383 n = fread ( oc->image, 1, oc->fileSize, f );
1384 if (n != oc->fileSize)
1385 barf("loadObj: error whilst reading `%s'", path);
1389 #endif /* USE_MMAP */
1391 # if defined(OBJFORMAT_MACHO) && defined(powerpc_HOST_ARCH)
1392 r = ocAllocateJumpIslands_MachO ( oc );
1393 if (!r) { return r; }
1394 # elif defined(OBJFORMAT_ELF) && defined(powerpc_HOST_ARCH)
1395 r = ocAllocateJumpIslands_ELF ( oc );
1396 if (!r) { return r; }
1399 /* verify the in-memory image */
1400 # if defined(OBJFORMAT_ELF)
1401 r = ocVerifyImage_ELF ( oc );
1402 # elif defined(OBJFORMAT_PEi386)
1403 r = ocVerifyImage_PEi386 ( oc );
1404 # elif defined(OBJFORMAT_MACHO)
1405 r = ocVerifyImage_MachO ( oc );
1407 barf("loadObj: no verify method");
1409 if (!r) { return r; }
1411 /* build the symbol list for this image */
1412 # if defined(OBJFORMAT_ELF)
1413 r = ocGetNames_ELF ( oc );
1414 # elif defined(OBJFORMAT_PEi386)
1415 r = ocGetNames_PEi386 ( oc );
1416 # elif defined(OBJFORMAT_MACHO)
1417 r = ocGetNames_MachO ( oc );
1419 barf("loadObj: no getNames method");
1421 if (!r) { return r; }
1423 /* loaded, but not resolved yet */
1424 oc->status = OBJECT_LOADED;
1429 /* -----------------------------------------------------------------------------
1430 * resolve all the currently unlinked objects in memory
1432 * Returns: 1 if ok, 0 on error.
1442 for (oc = objects; oc; oc = oc->next) {
1443 if (oc->status != OBJECT_RESOLVED) {
1444 # if defined(OBJFORMAT_ELF)
1445 r = ocResolve_ELF ( oc );
1446 # elif defined(OBJFORMAT_PEi386)
1447 r = ocResolve_PEi386 ( oc );
1448 # elif defined(OBJFORMAT_MACHO)
1449 r = ocResolve_MachO ( oc );
1451 barf("resolveObjs: not implemented on this platform");
1453 if (!r) { return r; }
1454 oc->status = OBJECT_RESOLVED;
1460 /* -----------------------------------------------------------------------------
1461 * delete an object from the pool
1464 unloadObj( char *path )
1466 ObjectCode *oc, *prev;
1468 ASSERT(symhash != NULL);
1469 ASSERT(objects != NULL);
1474 for (oc = objects; oc; prev = oc, oc = oc->next) {
1475 if (!strcmp(oc->fileName,path)) {
1477 /* Remove all the mappings for the symbols within this
1482 for (i = 0; i < oc->n_symbols; i++) {
1483 if (oc->symbols[i] != NULL) {
1484 removeStrHashTable(symhash, oc->symbols[i], NULL);
1492 prev->next = oc->next;
1495 /* We're going to leave this in place, in case there are
1496 any pointers from the heap into it: */
1497 /* stgFree(oc->image); */
1498 stgFree(oc->fileName);
1499 stgFree(oc->symbols);
1500 stgFree(oc->sections);
1501 /* The local hash table should have been freed at the end
1502 of the ocResolve_ call on it. */
1503 ASSERT(oc->lochash == NULL);
1509 errorBelch("unloadObj: can't find `%s' to unload", path);
1513 /* -----------------------------------------------------------------------------
1514 * Sanity checking. For each ObjectCode, maintain a list of address ranges
1515 * which may be prodded during relocation, and abort if we try and write
1516 * outside any of these.
1518 static void addProddableBlock ( ObjectCode* oc, void* start, int size )
1521 = stgMallocBytes(sizeof(ProddableBlock), "addProddableBlock");
1522 /* debugBelch("aPB %p %p %d\n", oc, start, size); */
1526 pb->next = oc->proddables;
1527 oc->proddables = pb;
1530 static void checkProddableBlock ( ObjectCode* oc, void* addr )
1533 for (pb = oc->proddables; pb != NULL; pb = pb->next) {
1534 char* s = (char*)(pb->start);
1535 char* e = s + pb->size - 1;
1536 char* a = (char*)addr;
1537 /* Assumes that the biggest fixup involves a 4-byte write. This
1538 probably needs to be changed to 8 (ie, +7) on 64-bit
1540 if (a >= s && (a+3) <= e) return;
1542 barf("checkProddableBlock: invalid fixup in runtime linker");
1545 /* -----------------------------------------------------------------------------
1546 * Section management.
1548 static void addSection ( ObjectCode* oc, SectionKind kind,
1549 void* start, void* end )
1551 Section* s = stgMallocBytes(sizeof(Section), "addSection");
1555 s->next = oc->sections;
1558 debugBelch("addSection: %p-%p (size %d), kind %d\n",
1559 start, ((char*)end)-1, end - start + 1, kind );
1564 /* --------------------------------------------------------------------------
1565 * PowerPC specifics (jump islands)
1566 * ------------------------------------------------------------------------*/
1568 #if defined(powerpc_HOST_ARCH)
1571 ocAllocateJumpIslands
1573 Allocate additional space at the end of the object file image to make room
1576 PowerPC relative branch instructions have a 24 bit displacement field.
1577 As PPC code is always 4-byte-aligned, this yields a +-32MB range.
1578 If a particular imported symbol is outside this range, we have to redirect
1579 the jump to a short piece of new code that just loads the 32bit absolute
1580 address and jumps there.
1581 This function just allocates space for one 16 byte ppcJumpIsland for every
1582 undefined symbol in the object file. The code for the islands is filled in by
1583 makeJumpIsland below.
1586 static int ocAllocateJumpIslands( ObjectCode* oc, int count, int first )
1592 int misalignment = 0;
1594 misalignment = oc->misalignment;
1599 // round up to the nearest 4
1600 aligned = (oc->fileSize + 3) & ~3;
1603 #ifndef linux_HOST_OS /* mremap is a linux extension */
1604 #error ocAllocateJumpIslands doesnt want USE_MMAP to be defined
1607 pagesize = getpagesize();
1608 n = ROUND_UP( oc->fileSize, pagesize );
1609 m = ROUND_UP( aligned + sizeof (ppcJumpIsland) * count, pagesize );
1611 /* If we have a half-page-size file and map one page of it then
1612 * the part of the page after the size of the file remains accessible.
1613 * If, however, we map in 2 pages, the 2nd page is not accessible
1614 * and will give a "Bus Error" on access. To get around this, we check
1615 * if we need any extra pages for the jump islands and map them in
1616 * anonymously. We must check that we actually require extra pages
1617 * otherwise the attempt to mmap 0 pages of anonymous memory will
1623 /* The effect of this mremap() call is only the ensure that we have
1624 * a sufficient number of virtually contiguous pages. As returned from
1625 * mremap, the pages past the end of the file are not backed. We give
1626 * them a backing by using MAP_FIXED to map in anonymous pages.
1628 oc->image = mremap( oc->image, n, m, MREMAP_MAYMOVE );
1630 if( oc->image == MAP_FAILED )
1632 errorBelch( "Unable to mremap for Jump Islands\n" );
1636 if( mmap( oc->image + n, m - n, PROT_READ | PROT_WRITE | PROT_EXEC,
1637 MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED, 0, 0 ) == MAP_FAILED )
1639 errorBelch( "Unable to mmap( MAP_FIXED ) for Jump Islands\n" );
1645 oc->image -= misalignment;
1646 oc->image = stgReallocBytes( oc->image,
1648 aligned + sizeof (ppcJumpIsland) * count,
1649 "ocAllocateJumpIslands" );
1650 oc->image += misalignment;
1651 #endif /* USE_MMAP */
1653 oc->jump_islands = (ppcJumpIsland *) (oc->image + aligned);
1654 memset( oc->jump_islands, 0, sizeof (ppcJumpIsland) * count );
1657 oc->jump_islands = NULL;
1659 oc->island_start_symbol = first;
1660 oc->n_islands = count;
1665 static unsigned long makeJumpIsland( ObjectCode* oc,
1666 unsigned long symbolNumber,
1667 unsigned long target )
1669 ppcJumpIsland *island;
1671 if( symbolNumber < oc->island_start_symbol ||
1672 symbolNumber - oc->island_start_symbol > oc->n_islands)
1675 island = &oc->jump_islands[symbolNumber - oc->island_start_symbol];
1677 // lis r12, hi16(target)
1678 island->lis_r12 = 0x3d80;
1679 island->hi_addr = target >> 16;
1681 // ori r12, r12, lo16(target)
1682 island->ori_r12_r12 = 0x618c;
1683 island->lo_addr = target & 0xffff;
1686 island->mtctr_r12 = 0x7d8903a6;
1689 island->bctr = 0x4e800420;
1691 return (unsigned long) island;
1695 ocFlushInstructionCache
1697 Flush the data & instruction caches.
1698 Because the PPC has split data/instruction caches, we have to
1699 do that whenever we modify code at runtime.
1702 static void ocFlushInstructionCache( ObjectCode *oc )
1704 int n = (oc->fileSize + sizeof( ppcJumpIsland ) * oc->n_islands + 3) / 4;
1705 unsigned long *p = (unsigned long *) oc->image;
1709 __asm__ volatile ( "dcbf 0,%0\n\t"
1717 __asm__ volatile ( "sync\n\t"
1723 /* --------------------------------------------------------------------------
1724 * PEi386 specifics (Win32 targets)
1725 * ------------------------------------------------------------------------*/
1727 /* The information for this linker comes from
1728 Microsoft Portable Executable
1729 and Common Object File Format Specification
1730 revision 5.1 January 1998
1731 which SimonM says comes from the MS Developer Network CDs.
1733 It can be found there (on older CDs), but can also be found
1736 http://www.microsoft.com/hwdev/hardware/PECOFF.asp
1738 (this is Rev 6.0 from February 1999).
1740 Things move, so if that fails, try searching for it via
1742 http://www.google.com/search?q=PE+COFF+specification
1744 The ultimate reference for the PE format is the Winnt.h
1745 header file that comes with the Platform SDKs; as always,
1746 implementations will drift wrt their documentation.
1748 A good background article on the PE format is Matt Pietrek's
1749 March 1994 article in Microsoft System Journal (MSJ)
1750 (Vol.9, No. 3): "Peering Inside the PE: A Tour of the
1751 Win32 Portable Executable File Format." The info in there
1752 has recently been updated in a two part article in
1753 MSDN magazine, issues Feb and March 2002,
1754 "Inside Windows: An In-Depth Look into the Win32 Portable
1755 Executable File Format"
1757 John Levine's book "Linkers and Loaders" contains useful
1762 #if defined(OBJFORMAT_PEi386)
1766 typedef unsigned char UChar;
1767 typedef unsigned short UInt16;
1768 typedef unsigned int UInt32;
1775 UInt16 NumberOfSections;
1776 UInt32 TimeDateStamp;
1777 UInt32 PointerToSymbolTable;
1778 UInt32 NumberOfSymbols;
1779 UInt16 SizeOfOptionalHeader;
1780 UInt16 Characteristics;
1784 #define sizeof_COFF_header 20
1791 UInt32 VirtualAddress;
1792 UInt32 SizeOfRawData;
1793 UInt32 PointerToRawData;
1794 UInt32 PointerToRelocations;
1795 UInt32 PointerToLinenumbers;
1796 UInt16 NumberOfRelocations;
1797 UInt16 NumberOfLineNumbers;
1798 UInt32 Characteristics;
1802 #define sizeof_COFF_section 40
1809 UInt16 SectionNumber;
1812 UChar NumberOfAuxSymbols;
1816 #define sizeof_COFF_symbol 18
1821 UInt32 VirtualAddress;
1822 UInt32 SymbolTableIndex;
1827 #define sizeof_COFF_reloc 10
1830 /* From PE spec doc, section 3.3.2 */
1831 /* Note use of MYIMAGE_* since IMAGE_* are already defined in
1832 windows.h -- for the same purpose, but I want to know what I'm
1834 #define MYIMAGE_FILE_RELOCS_STRIPPED 0x0001
1835 #define MYIMAGE_FILE_EXECUTABLE_IMAGE 0x0002
1836 #define MYIMAGE_FILE_DLL 0x2000
1837 #define MYIMAGE_FILE_SYSTEM 0x1000
1838 #define MYIMAGE_FILE_BYTES_REVERSED_HI 0x8000
1839 #define MYIMAGE_FILE_BYTES_REVERSED_LO 0x0080
1840 #define MYIMAGE_FILE_32BIT_MACHINE 0x0100
1842 /* From PE spec doc, section 5.4.2 and 5.4.4 */
1843 #define MYIMAGE_SYM_CLASS_EXTERNAL 2
1844 #define MYIMAGE_SYM_CLASS_STATIC 3
1845 #define MYIMAGE_SYM_UNDEFINED 0
1847 /* From PE spec doc, section 4.1 */
1848 #define MYIMAGE_SCN_CNT_CODE 0x00000020
1849 #define MYIMAGE_SCN_CNT_INITIALIZED_DATA 0x00000040
1850 #define MYIMAGE_SCN_LNK_NRELOC_OVFL 0x01000000
1852 /* From PE spec doc, section 5.2.1 */
1853 #define MYIMAGE_REL_I386_DIR32 0x0006
1854 #define MYIMAGE_REL_I386_REL32 0x0014
1857 /* We use myindex to calculate array addresses, rather than
1858 simply doing the normal subscript thing. That's because
1859 some of the above structs have sizes which are not
1860 a whole number of words. GCC rounds their sizes up to a
1861 whole number of words, which means that the address calcs
1862 arising from using normal C indexing or pointer arithmetic
1863 are just plain wrong. Sigh.
1866 myindex ( int scale, void* base, int index )
1869 ((UChar*)base) + scale * index;
1874 printName ( UChar* name, UChar* strtab )
1876 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
1877 UInt32 strtab_offset = * (UInt32*)(name+4);
1878 debugBelch("%s", strtab + strtab_offset );
1881 for (i = 0; i < 8; i++) {
1882 if (name[i] == 0) break;
1883 debugBelch("%c", name[i] );
1890 copyName ( UChar* name, UChar* strtab, UChar* dst, int dstSize )
1892 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
1893 UInt32 strtab_offset = * (UInt32*)(name+4);
1894 strncpy ( dst, strtab+strtab_offset, dstSize );
1900 if (name[i] == 0) break;
1910 cstring_from_COFF_symbol_name ( UChar* name, UChar* strtab )
1913 /* If the string is longer than 8 bytes, look in the
1914 string table for it -- this will be correctly zero terminated.
1916 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
1917 UInt32 strtab_offset = * (UInt32*)(name+4);
1918 return ((UChar*)strtab) + strtab_offset;
1920 /* Otherwise, if shorter than 8 bytes, return the original,
1921 which by defn is correctly terminated.
1923 if (name[7]==0) return name;
1924 /* The annoying case: 8 bytes. Copy into a temporary
1925 (which is never freed ...)
1927 newstr = stgMallocBytes(9, "cstring_from_COFF_symbol_name");
1929 strncpy(newstr,name,8);
1935 /* Just compares the short names (first 8 chars) */
1936 static COFF_section *
1937 findPEi386SectionCalled ( ObjectCode* oc, char* name )
1941 = (COFF_header*)(oc->image);
1942 COFF_section* sectab
1944 ((UChar*)(oc->image))
1945 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
1947 for (i = 0; i < hdr->NumberOfSections; i++) {
1950 COFF_section* section_i
1952 myindex ( sizeof_COFF_section, sectab, i );
1953 n1 = (UChar*) &(section_i->Name);
1955 if (n1[0]==n2[0] && n1[1]==n2[1] && n1[2]==n2[2] &&
1956 n1[3]==n2[3] && n1[4]==n2[4] && n1[5]==n2[5] &&
1957 n1[6]==n2[6] && n1[7]==n2[7])
1966 zapTrailingAtSign ( UChar* sym )
1968 # define my_isdigit(c) ((c) >= '0' && (c) <= '9')
1970 if (sym[0] == 0) return;
1972 while (sym[i] != 0) i++;
1975 while (j > 0 && my_isdigit(sym[j])) j--;
1976 if (j > 0 && sym[j] == '@' && j != i) sym[j] = 0;
1982 ocVerifyImage_PEi386 ( ObjectCode* oc )
1987 COFF_section* sectab;
1988 COFF_symbol* symtab;
1990 /* debugBelch("\nLOADING %s\n", oc->fileName); */
1991 hdr = (COFF_header*)(oc->image);
1992 sectab = (COFF_section*) (
1993 ((UChar*)(oc->image))
1994 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
1996 symtab = (COFF_symbol*) (
1997 ((UChar*)(oc->image))
1998 + hdr->PointerToSymbolTable
2000 strtab = ((UChar*)symtab)
2001 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
2003 if (hdr->Machine != 0x14c) {
2004 errorBelch("%s: Not x86 PEi386", oc->fileName);
2007 if (hdr->SizeOfOptionalHeader != 0) {
2008 errorBelch("%s: PEi386 with nonempty optional header", oc->fileName);
2011 if ( /* (hdr->Characteristics & MYIMAGE_FILE_RELOCS_STRIPPED) || */
2012 (hdr->Characteristics & MYIMAGE_FILE_EXECUTABLE_IMAGE) ||
2013 (hdr->Characteristics & MYIMAGE_FILE_DLL) ||
2014 (hdr->Characteristics & MYIMAGE_FILE_SYSTEM) ) {
2015 errorBelch("%s: Not a PEi386 object file", oc->fileName);
2018 if ( (hdr->Characteristics & MYIMAGE_FILE_BYTES_REVERSED_HI)
2019 /* || !(hdr->Characteristics & MYIMAGE_FILE_32BIT_MACHINE) */ ) {
2020 errorBelch("%s: Invalid PEi386 word size or endiannness: %d",
2022 (int)(hdr->Characteristics));
2025 /* If the string table size is way crazy, this might indicate that
2026 there are more than 64k relocations, despite claims to the
2027 contrary. Hence this test. */
2028 /* debugBelch("strtab size %d\n", * (UInt32*)strtab); */
2030 if ( (*(UInt32*)strtab) > 600000 ) {
2031 /* Note that 600k has no special significance other than being
2032 big enough to handle the almost-2MB-sized lumps that
2033 constitute HSwin32*.o. */
2034 debugBelch("PEi386 object has suspiciously large string table; > 64k relocs?");
2039 /* No further verification after this point; only debug printing. */
2041 IF_DEBUG(linker, i=1);
2042 if (i == 0) return 1;
2044 debugBelch( "sectab offset = %d\n", ((UChar*)sectab) - ((UChar*)hdr) );
2045 debugBelch( "symtab offset = %d\n", ((UChar*)symtab) - ((UChar*)hdr) );
2046 debugBelch( "strtab offset = %d\n", ((UChar*)strtab) - ((UChar*)hdr) );
2049 debugBelch( "Machine: 0x%x\n", (UInt32)(hdr->Machine) );
2050 debugBelch( "# sections: %d\n", (UInt32)(hdr->NumberOfSections) );
2051 debugBelch( "time/date: 0x%x\n", (UInt32)(hdr->TimeDateStamp) );
2052 debugBelch( "symtab offset: %d\n", (UInt32)(hdr->PointerToSymbolTable) );
2053 debugBelch( "# symbols: %d\n", (UInt32)(hdr->NumberOfSymbols) );
2054 debugBelch( "sz of opt hdr: %d\n", (UInt32)(hdr->SizeOfOptionalHeader) );
2055 debugBelch( "characteristics: 0x%x\n", (UInt32)(hdr->Characteristics) );
2057 /* Print the section table. */
2059 for (i = 0; i < hdr->NumberOfSections; i++) {
2061 COFF_section* sectab_i
2063 myindex ( sizeof_COFF_section, sectab, i );
2070 printName ( sectab_i->Name, strtab );
2080 sectab_i->VirtualSize,
2081 sectab_i->VirtualAddress,
2082 sectab_i->SizeOfRawData,
2083 sectab_i->PointerToRawData,
2084 sectab_i->NumberOfRelocations,
2085 sectab_i->PointerToRelocations,
2086 sectab_i->PointerToRawData
2088 reltab = (COFF_reloc*) (
2089 ((UChar*)(oc->image)) + sectab_i->PointerToRelocations
2092 if ( sectab_i->Characteristics & MYIMAGE_SCN_LNK_NRELOC_OVFL ) {
2093 /* If the relocation field (a short) has overflowed, the
2094 * real count can be found in the first reloc entry.
2096 * See Section 4.1 (last para) of the PE spec (rev6.0).
2098 COFF_reloc* rel = (COFF_reloc*)
2099 myindex ( sizeof_COFF_reloc, reltab, 0 );
2100 noRelocs = rel->VirtualAddress;
2103 noRelocs = sectab_i->NumberOfRelocations;
2107 for (; j < noRelocs; j++) {
2109 COFF_reloc* rel = (COFF_reloc*)
2110 myindex ( sizeof_COFF_reloc, reltab, j );
2112 " type 0x%-4x vaddr 0x%-8x name `",
2114 rel->VirtualAddress );
2115 sym = (COFF_symbol*)
2116 myindex ( sizeof_COFF_symbol, symtab, rel->SymbolTableIndex );
2117 /* Hmm..mysterious looking offset - what's it for? SOF */
2118 printName ( sym->Name, strtab -10 );
2125 debugBelch("string table has size 0x%x\n", * (UInt32*)strtab );
2126 debugBelch("---START of string table---\n");
2127 for (i = 4; i < *(Int32*)strtab; i++) {
2129 debugBelch("\n"); else
2130 debugBelch("%c", strtab[i] );
2132 debugBelch("--- END of string table---\n");
2137 COFF_symbol* symtab_i;
2138 if (i >= (Int32)(hdr->NumberOfSymbols)) break;
2139 symtab_i = (COFF_symbol*)
2140 myindex ( sizeof_COFF_symbol, symtab, i );
2146 printName ( symtab_i->Name, strtab );
2155 (Int32)(symtab_i->SectionNumber),
2156 (UInt32)symtab_i->Type,
2157 (UInt32)symtab_i->StorageClass,
2158 (UInt32)symtab_i->NumberOfAuxSymbols
2160 i += symtab_i->NumberOfAuxSymbols;
2170 ocGetNames_PEi386 ( ObjectCode* oc )
2173 COFF_section* sectab;
2174 COFF_symbol* symtab;
2181 hdr = (COFF_header*)(oc->image);
2182 sectab = (COFF_section*) (
2183 ((UChar*)(oc->image))
2184 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2186 symtab = (COFF_symbol*) (
2187 ((UChar*)(oc->image))
2188 + hdr->PointerToSymbolTable
2190 strtab = ((UChar*)(oc->image))
2191 + hdr->PointerToSymbolTable
2192 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
2194 /* Allocate space for any (local, anonymous) .bss sections. */
2196 for (i = 0; i < hdr->NumberOfSections; i++) {
2199 COFF_section* sectab_i
2201 myindex ( sizeof_COFF_section, sectab, i );
2202 if (0 != strcmp(sectab_i->Name, ".bss")) continue;
2203 /* sof 10/05: the PE spec text isn't too clear regarding what
2204 * the SizeOfRawData field is supposed to hold for object
2205 * file sections containing just uninitialized data -- for executables,
2206 * it is supposed to be zero; unclear what it's supposed to be
2207 * for object files. However, VirtualSize is guaranteed to be
2208 * zero for object files, which definitely suggests that SizeOfRawData
2209 * will be non-zero (where else would the size of this .bss section be
2210 * stored?) Looking at the COFF_section info for incoming object files,
2211 * this certainly appears to be the case.
2213 * => I suspect we've been incorrectly handling .bss sections in (relocatable)
2214 * object files up until now. This turned out to bite us with ghc-6.4.1's use
2215 * of gcc-3.4.x, which has started to emit initially-zeroed-out local 'static'
2216 * variable decls into to the .bss section. (The specific function in Q which
2217 * triggered this is libraries/base/cbits/dirUtils.c:__hscore_getFolderPath())
2219 if (sectab_i->VirtualSize == 0 && sectab_i->SizeOfRawData == 0) continue;
2220 /* This is a non-empty .bss section. Allocate zeroed space for
2221 it, and set its PointerToRawData field such that oc->image +
2222 PointerToRawData == addr_of_zeroed_space. */
2223 bss_sz = sectab_i->VirtualSize;
2224 if ( bss_sz < sectab_i->SizeOfRawData) { bss_sz = sectab_i->SizeOfRawData; }
2225 zspace = stgCallocBytes(1, bss_sz, "ocGetNames_PEi386(anonymous bss)");
2226 sectab_i->PointerToRawData = ((UChar*)zspace) - ((UChar*)(oc->image));
2227 addProddableBlock(oc, zspace, bss_sz);
2228 /* debugBelch("BSS anon section at 0x%x\n", zspace); */
2231 /* Copy section information into the ObjectCode. */
2233 for (i = 0; i < hdr->NumberOfSections; i++) {
2239 = SECTIONKIND_OTHER;
2240 COFF_section* sectab_i
2242 myindex ( sizeof_COFF_section, sectab, i );
2243 IF_DEBUG(linker, debugBelch("section name = %s\n", sectab_i->Name ));
2246 /* I'm sure this is the Right Way to do it. However, the
2247 alternative of testing the sectab_i->Name field seems to
2248 work ok with Cygwin.
2250 if (sectab_i->Characteristics & MYIMAGE_SCN_CNT_CODE ||
2251 sectab_i->Characteristics & MYIMAGE_SCN_CNT_INITIALIZED_DATA)
2252 kind = SECTIONKIND_CODE_OR_RODATA;
2255 if (0==strcmp(".text",sectab_i->Name) ||
2256 0==strcmp(".rdata",sectab_i->Name)||
2257 0==strcmp(".rodata",sectab_i->Name))
2258 kind = SECTIONKIND_CODE_OR_RODATA;
2259 if (0==strcmp(".data",sectab_i->Name) ||
2260 0==strcmp(".bss",sectab_i->Name))
2261 kind = SECTIONKIND_RWDATA;
2263 ASSERT(sectab_i->SizeOfRawData == 0 || sectab_i->VirtualSize == 0);
2264 sz = sectab_i->SizeOfRawData;
2265 if (sz < sectab_i->VirtualSize) sz = sectab_i->VirtualSize;
2267 start = ((UChar*)(oc->image)) + sectab_i->PointerToRawData;
2268 end = start + sz - 1;
2270 if (kind == SECTIONKIND_OTHER
2271 /* Ignore sections called which contain stabs debugging
2273 && 0 != strcmp(".stab", sectab_i->Name)
2274 && 0 != strcmp(".stabstr", sectab_i->Name)
2275 /* ignore constructor section for now */
2276 && 0 != strcmp(".ctors", sectab_i->Name)
2277 /* ignore section generated from .ident */
2278 && 0!= strcmp("/4", sectab_i->Name)
2280 errorBelch("Unknown PEi386 section name `%s' (while processing: %s)", sectab_i->Name, oc->fileName);
2284 if (kind != SECTIONKIND_OTHER && end >= start) {
2285 addSection(oc, kind, start, end);
2286 addProddableBlock(oc, start, end - start + 1);
2290 /* Copy exported symbols into the ObjectCode. */
2292 oc->n_symbols = hdr->NumberOfSymbols;
2293 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
2294 "ocGetNames_PEi386(oc->symbols)");
2295 /* Call me paranoid; I don't care. */
2296 for (i = 0; i < oc->n_symbols; i++)
2297 oc->symbols[i] = NULL;
2301 COFF_symbol* symtab_i;
2302 if (i >= (Int32)(hdr->NumberOfSymbols)) break;
2303 symtab_i = (COFF_symbol*)
2304 myindex ( sizeof_COFF_symbol, symtab, i );
2308 if (symtab_i->StorageClass == MYIMAGE_SYM_CLASS_EXTERNAL
2309 && symtab_i->SectionNumber != MYIMAGE_SYM_UNDEFINED) {
2310 /* This symbol is global and defined, viz, exported */
2311 /* for MYIMAGE_SYMCLASS_EXTERNAL
2312 && !MYIMAGE_SYM_UNDEFINED,
2313 the address of the symbol is:
2314 address of relevant section + offset in section
2316 COFF_section* sectabent
2317 = (COFF_section*) myindex ( sizeof_COFF_section,
2319 symtab_i->SectionNumber-1 );
2320 addr = ((UChar*)(oc->image))
2321 + (sectabent->PointerToRawData
2325 if (symtab_i->SectionNumber == MYIMAGE_SYM_UNDEFINED
2326 && symtab_i->Value > 0) {
2327 /* This symbol isn't in any section at all, ie, global bss.
2328 Allocate zeroed space for it. */
2329 addr = stgCallocBytes(1, symtab_i->Value,
2330 "ocGetNames_PEi386(non-anonymous bss)");
2331 addSection(oc, SECTIONKIND_RWDATA, addr,
2332 ((UChar*)addr) + symtab_i->Value - 1);
2333 addProddableBlock(oc, addr, symtab_i->Value);
2334 /* debugBelch("BSS section at 0x%x\n", addr); */
2337 if (addr != NULL ) {
2338 sname = cstring_from_COFF_symbol_name ( symtab_i->Name, strtab );
2339 /* debugBelch("addSymbol %p `%s \n", addr,sname); */
2340 IF_DEBUG(linker, debugBelch("addSymbol %p `%s'\n", addr,sname);)
2341 ASSERT(i >= 0 && i < oc->n_symbols);
2342 /* cstring_from_COFF_symbol_name always succeeds. */
2343 oc->symbols[i] = sname;
2344 ghciInsertStrHashTable(oc->fileName, symhash, sname, addr);
2348 "IGNORING symbol %d\n"
2352 printName ( symtab_i->Name, strtab );
2361 (Int32)(symtab_i->SectionNumber),
2362 (UInt32)symtab_i->Type,
2363 (UInt32)symtab_i->StorageClass,
2364 (UInt32)symtab_i->NumberOfAuxSymbols
2369 i += symtab_i->NumberOfAuxSymbols;
2378 ocResolve_PEi386 ( ObjectCode* oc )
2381 COFF_section* sectab;
2382 COFF_symbol* symtab;
2392 /* ToDo: should be variable-sized? But is at least safe in the
2393 sense of buffer-overrun-proof. */
2395 /* debugBelch("resolving for %s\n", oc->fileName); */
2397 hdr = (COFF_header*)(oc->image);
2398 sectab = (COFF_section*) (
2399 ((UChar*)(oc->image))
2400 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2402 symtab = (COFF_symbol*) (
2403 ((UChar*)(oc->image))
2404 + hdr->PointerToSymbolTable
2406 strtab = ((UChar*)(oc->image))
2407 + hdr->PointerToSymbolTable
2408 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
2410 for (i = 0; i < hdr->NumberOfSections; i++) {
2411 COFF_section* sectab_i
2413 myindex ( sizeof_COFF_section, sectab, i );
2416 ((UChar*)(oc->image)) + sectab_i->PointerToRelocations
2419 /* Ignore sections called which contain stabs debugging
2421 if (0 == strcmp(".stab", sectab_i->Name)
2422 || 0 == strcmp(".stabstr", sectab_i->Name)
2423 || 0 == strcmp(".ctors", sectab_i->Name))
2426 if ( sectab_i->Characteristics & MYIMAGE_SCN_LNK_NRELOC_OVFL ) {
2427 /* If the relocation field (a short) has overflowed, the
2428 * real count can be found in the first reloc entry.
2430 * See Section 4.1 (last para) of the PE spec (rev6.0).
2432 * Nov2003 update: the GNU linker still doesn't correctly
2433 * handle the generation of relocatable object files with
2434 * overflown relocations. Hence the output to warn of potential
2437 COFF_reloc* rel = (COFF_reloc*)
2438 myindex ( sizeof_COFF_reloc, reltab, 0 );
2439 noRelocs = rel->VirtualAddress;
2441 /* 10/05: we now assume (and check for) a GNU ld that is capable
2442 * of handling object files with (>2^16) of relocs.
2445 debugBelch("WARNING: Overflown relocation field (# relocs found: %u)\n",
2450 noRelocs = sectab_i->NumberOfRelocations;
2455 for (; j < noRelocs; j++) {
2457 COFF_reloc* reltab_j
2459 myindex ( sizeof_COFF_reloc, reltab, j );
2461 /* the location to patch */
2463 ((UChar*)(oc->image))
2464 + (sectab_i->PointerToRawData
2465 + reltab_j->VirtualAddress
2466 - sectab_i->VirtualAddress )
2468 /* the existing contents of pP */
2470 /* the symbol to connect to */
2471 sym = (COFF_symbol*)
2472 myindex ( sizeof_COFF_symbol,
2473 symtab, reltab_j->SymbolTableIndex );
2476 "reloc sec %2d num %3d: type 0x%-4x "
2477 "vaddr 0x%-8x name `",
2479 (UInt32)reltab_j->Type,
2480 reltab_j->VirtualAddress );
2481 printName ( sym->Name, strtab );
2482 debugBelch("'\n" ));
2484 if (sym->StorageClass == MYIMAGE_SYM_CLASS_STATIC) {
2485 COFF_section* section_sym
2486 = findPEi386SectionCalled ( oc, sym->Name );
2488 errorBelch("%s: can't find section `%s'", oc->fileName, sym->Name);
2491 S = ((UInt32)(oc->image))
2492 + (section_sym->PointerToRawData
2495 copyName ( sym->Name, strtab, symbol, 1000-1 );
2496 S = (UInt32) lookupLocalSymbol( oc, symbol );
2497 if ((void*)S != NULL) goto foundit;
2498 S = (UInt32) lookupSymbol( symbol );
2499 if ((void*)S != NULL) goto foundit;
2500 zapTrailingAtSign ( symbol );
2501 S = (UInt32) lookupLocalSymbol( oc, symbol );
2502 if ((void*)S != NULL) goto foundit;
2503 S = (UInt32) lookupSymbol( symbol );
2504 if ((void*)S != NULL) goto foundit;
2505 /* Newline first because the interactive linker has printed "linking..." */
2506 errorBelch("\n%s: unknown symbol `%s'", oc->fileName, symbol);
2510 checkProddableBlock(oc, pP);
2511 switch (reltab_j->Type) {
2512 case MYIMAGE_REL_I386_DIR32:
2515 case MYIMAGE_REL_I386_REL32:
2516 /* Tricky. We have to insert a displacement at
2517 pP which, when added to the PC for the _next_
2518 insn, gives the address of the target (S).
2519 Problem is to know the address of the next insn
2520 when we only know pP. We assume that this
2521 literal field is always the last in the insn,
2522 so that the address of the next insn is pP+4
2523 -- hence the constant 4.
2524 Also I don't know if A should be added, but so
2525 far it has always been zero.
2527 SOF 05/2005: 'A' (old contents of *pP) have been observed
2528 to contain values other than zero (the 'wx' object file
2529 that came with wxhaskell-0.9.4; dunno how it was compiled..).
2530 So, add displacement to old value instead of asserting
2531 A to be zero. Fixes wxhaskell-related crashes, and no other
2532 ill effects have been observed.
2534 Update: the reason why we're seeing these more elaborate
2535 relocations is due to a switch in how the NCG compiles SRTs
2536 and offsets to them from info tables. SRTs live in .(ro)data,
2537 while info tables live in .text, causing GAS to emit REL32/DISP32
2538 relocations with non-zero values. Adding the displacement is
2539 the right thing to do.
2541 *pP = S - ((UInt32)pP) - 4 + A;
2544 debugBelch("%s: unhandled PEi386 relocation type %d",
2545 oc->fileName, reltab_j->Type);
2552 IF_DEBUG(linker, debugBelch("completed %s", oc->fileName));
2556 #endif /* defined(OBJFORMAT_PEi386) */
2559 /* --------------------------------------------------------------------------
2561 * ------------------------------------------------------------------------*/
2563 #if defined(OBJFORMAT_ELF)
2568 #if defined(sparc_HOST_ARCH)
2569 # define ELF_TARGET_SPARC /* Used inside <elf.h> */
2570 #elif defined(i386_HOST_ARCH)
2571 # define ELF_TARGET_386 /* Used inside <elf.h> */
2572 #elif defined(x86_64_HOST_ARCH)
2573 # define ELF_TARGET_X64_64
2575 #elif defined (ia64_HOST_ARCH)
2576 # define ELF_TARGET_IA64 /* Used inside <elf.h> */
2578 # define ELF_FUNCTION_DESC /* calling convention uses function descriptors */
2579 # define ELF_NEED_GOT /* needs Global Offset Table */
2580 # define ELF_NEED_PLT /* needs Procedure Linkage Tables */
2583 #if !defined(openbsd_HOST_OS)
2586 /* openbsd elf has things in different places, with diff names */
2587 #include <elf_abi.h>
2588 #include <machine/reloc.h>
2589 #define R_386_32 RELOC_32
2590 #define R_386_PC32 RELOC_PC32
2594 * Define a set of types which can be used for both ELF32 and ELF64
2598 #define ELFCLASS ELFCLASS64
2599 #define Elf_Addr Elf64_Addr
2600 #define Elf_Word Elf64_Word
2601 #define Elf_Sword Elf64_Sword
2602 #define Elf_Ehdr Elf64_Ehdr
2603 #define Elf_Phdr Elf64_Phdr
2604 #define Elf_Shdr Elf64_Shdr
2605 #define Elf_Sym Elf64_Sym
2606 #define Elf_Rel Elf64_Rel
2607 #define Elf_Rela Elf64_Rela
2608 #define ELF_ST_TYPE ELF64_ST_TYPE
2609 #define ELF_ST_BIND ELF64_ST_BIND
2610 #define ELF_R_TYPE ELF64_R_TYPE
2611 #define ELF_R_SYM ELF64_R_SYM
2613 #define ELFCLASS ELFCLASS32
2614 #define Elf_Addr Elf32_Addr
2615 #define Elf_Word Elf32_Word
2616 #define Elf_Sword Elf32_Sword
2617 #define Elf_Ehdr Elf32_Ehdr
2618 #define Elf_Phdr Elf32_Phdr
2619 #define Elf_Shdr Elf32_Shdr
2620 #define Elf_Sym Elf32_Sym
2621 #define Elf_Rel Elf32_Rel
2622 #define Elf_Rela Elf32_Rela
2624 #define ELF_ST_TYPE ELF32_ST_TYPE
2627 #define ELF_ST_BIND ELF32_ST_BIND
2630 #define ELF_R_TYPE ELF32_R_TYPE
2633 #define ELF_R_SYM ELF32_R_SYM
2639 * Functions to allocate entries in dynamic sections. Currently we simply
2640 * preallocate a large number, and we don't check if a entry for the given
2641 * target already exists (a linear search is too slow). Ideally these
2642 * entries would be associated with symbols.
2645 /* These sizes sufficient to load HSbase + HShaskell98 + a few modules */
2646 #define GOT_SIZE 0x20000
2647 #define FUNCTION_TABLE_SIZE 0x10000
2648 #define PLT_SIZE 0x08000
2651 static Elf_Addr got[GOT_SIZE];
2652 static unsigned int gotIndex;
2653 static Elf_Addr gp_val = (Elf_Addr)got;
2656 allocateGOTEntry(Elf_Addr target)
2660 if (gotIndex >= GOT_SIZE)
2661 barf("Global offset table overflow");
2663 entry = &got[gotIndex++];
2665 return (Elf_Addr)entry;
2669 #ifdef ELF_FUNCTION_DESC
2675 static FunctionDesc functionTable[FUNCTION_TABLE_SIZE];
2676 static unsigned int functionTableIndex;
2679 allocateFunctionDesc(Elf_Addr target)
2681 FunctionDesc *entry;
2683 if (functionTableIndex >= FUNCTION_TABLE_SIZE)
2684 barf("Function table overflow");
2686 entry = &functionTable[functionTableIndex++];
2688 entry->gp = (Elf_Addr)gp_val;
2689 return (Elf_Addr)entry;
2693 copyFunctionDesc(Elf_Addr target)
2695 FunctionDesc *olddesc = (FunctionDesc *)target;
2696 FunctionDesc *newdesc;
2698 newdesc = (FunctionDesc *)allocateFunctionDesc(olddesc->ip);
2699 newdesc->gp = olddesc->gp;
2700 return (Elf_Addr)newdesc;
2705 #ifdef ia64_HOST_ARCH
2706 static void ia64_reloc_gprel22(Elf_Addr target, Elf_Addr value);
2707 static void ia64_reloc_pcrel21(Elf_Addr target, Elf_Addr value, ObjectCode *oc);
2709 static unsigned char plt_code[] =
2711 /* taken from binutils bfd/elfxx-ia64.c */
2712 0x0b, 0x78, 0x00, 0x02, 0x00, 0x24, /* [MMI] addl r15=0,r1;; */
2713 0x00, 0x41, 0x3c, 0x30, 0x28, 0xc0, /* ld8 r16=[r15],8 */
2714 0x01, 0x08, 0x00, 0x84, /* mov r14=r1;; */
2715 0x11, 0x08, 0x00, 0x1e, 0x18, 0x10, /* [MIB] ld8 r1=[r15] */
2716 0x60, 0x80, 0x04, 0x80, 0x03, 0x00, /* mov b6=r16 */
2717 0x60, 0x00, 0x80, 0x00 /* br.few b6;; */
2720 /* If we can't get to the function descriptor via gp, take a local copy of it */
2721 #define PLT_RELOC(code, target) { \
2722 Elf64_Sxword rel_value = target - gp_val; \
2723 if ((rel_value > 0x1fffff) || (rel_value < -0x1fffff)) \
2724 ia64_reloc_gprel22((Elf_Addr)code, copyFunctionDesc(target)); \
2726 ia64_reloc_gprel22((Elf_Addr)code, target); \
2731 unsigned char code[sizeof(plt_code)];
2735 allocatePLTEntry(Elf_Addr target, ObjectCode *oc)
2737 PLTEntry *plt = (PLTEntry *)oc->plt;
2740 if (oc->pltIndex >= PLT_SIZE)
2741 barf("Procedure table overflow");
2743 entry = &plt[oc->pltIndex++];
2744 memcpy(entry->code, plt_code, sizeof(entry->code));
2745 PLT_RELOC(entry->code, target);
2746 return (Elf_Addr)entry;
2752 return (PLT_SIZE * sizeof(PLTEntry));
2757 #if x86_64_HOST_ARCH
2758 // On x86_64, 32-bit relocations are often used, which requires that
2759 // we can resolve a symbol to a 32-bit offset. However, shared
2760 // libraries are placed outside the 2Gb area, which leaves us with a
2761 // problem when we need to give a 32-bit offset to a symbol in a
2764 // For a function symbol, we can allocate a bounce sequence inside the
2765 // 2Gb area and resolve the symbol to this. The bounce sequence is
2766 // simply a long jump instruction to the real location of the symbol.
2768 // For data references, we're screwed.
2771 unsigned char jmp[8]; /* 6 byte instruction: jmpq *0x00000002(%rip) */
2775 #define X86_64_BB_SIZE 1024
2777 static x86_64_bounce *x86_64_bounce_buffer = NULL;
2778 static nat x86_64_bb_next_off;
2781 x86_64_high_symbol( char *lbl, void *addr )
2783 x86_64_bounce *bounce;
2785 if ( x86_64_bounce_buffer == NULL ||
2786 x86_64_bb_next_off >= X86_64_BB_SIZE ) {
2787 x86_64_bounce_buffer =
2788 mmap(NULL, X86_64_BB_SIZE * sizeof(x86_64_bounce),
2789 PROT_EXEC|PROT_READ|PROT_WRITE,
2790 MAP_PRIVATE|MAP_32BIT|MAP_ANONYMOUS, -1, 0);
2791 if (x86_64_bounce_buffer == MAP_FAILED) {
2792 barf("x86_64_high_symbol: mmap failed");
2794 x86_64_bb_next_off = 0;
2796 bounce = &x86_64_bounce_buffer[x86_64_bb_next_off];
2797 bounce->jmp[0] = 0xff;
2798 bounce->jmp[1] = 0x25;
2799 bounce->jmp[2] = 0x02;
2800 bounce->jmp[3] = 0x00;
2801 bounce->jmp[4] = 0x00;
2802 bounce->jmp[5] = 0x00;
2803 bounce->addr = addr;
2804 x86_64_bb_next_off++;
2806 IF_DEBUG(linker, debugBelch("x86_64: allocated bounce entry for %s->%p at %p\n",
2807 lbl, addr, bounce));
2809 insertStrHashTable(symhash, lbl, bounce);
2816 * Generic ELF functions
2820 findElfSection ( void* objImage, Elf_Word sh_type )
2822 char* ehdrC = (char*)objImage;
2823 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2824 Elf_Shdr* shdr = (Elf_Shdr*)(ehdrC + ehdr->e_shoff);
2825 char* sh_strtab = ehdrC + shdr[ehdr->e_shstrndx].sh_offset;
2829 for (i = 0; i < ehdr->e_shnum; i++) {
2830 if (shdr[i].sh_type == sh_type
2831 /* Ignore the section header's string table. */
2832 && i != ehdr->e_shstrndx
2833 /* Ignore string tables named .stabstr, as they contain
2835 && 0 != memcmp(".stabstr", sh_strtab + shdr[i].sh_name, 8)
2837 ptr = ehdrC + shdr[i].sh_offset;
2844 #if defined(ia64_HOST_ARCH)
2846 findElfSegment ( void* objImage, Elf_Addr vaddr )
2848 char* ehdrC = (char*)objImage;
2849 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2850 Elf_Phdr* phdr = (Elf_Phdr*)(ehdrC + ehdr->e_phoff);
2851 Elf_Addr segaddr = 0;
2854 for (i = 0; i < ehdr->e_phnum; i++) {
2855 segaddr = phdr[i].p_vaddr;
2856 if ((vaddr >= segaddr) && (vaddr < segaddr + phdr[i].p_memsz))
2864 ocVerifyImage_ELF ( ObjectCode* oc )
2868 int i, j, nent, nstrtab, nsymtabs;
2872 char* ehdrC = (char*)(oc->image);
2873 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2875 if (ehdr->e_ident[EI_MAG0] != ELFMAG0 ||
2876 ehdr->e_ident[EI_MAG1] != ELFMAG1 ||
2877 ehdr->e_ident[EI_MAG2] != ELFMAG2 ||
2878 ehdr->e_ident[EI_MAG3] != ELFMAG3) {
2879 errorBelch("%s: not an ELF object", oc->fileName);
2883 if (ehdr->e_ident[EI_CLASS] != ELFCLASS) {
2884 errorBelch("%s: unsupported ELF format", oc->fileName);
2888 if (ehdr->e_ident[EI_DATA] == ELFDATA2LSB) {
2889 IF_DEBUG(linker,debugBelch( "Is little-endian\n" ));
2891 if (ehdr->e_ident[EI_DATA] == ELFDATA2MSB) {
2892 IF_DEBUG(linker,debugBelch( "Is big-endian\n" ));
2894 errorBelch("%s: unknown endiannness", oc->fileName);
2898 if (ehdr->e_type != ET_REL) {
2899 errorBelch("%s: not a relocatable object (.o) file", oc->fileName);
2902 IF_DEBUG(linker, debugBelch( "Is a relocatable object (.o) file\n" ));
2904 IF_DEBUG(linker,debugBelch( "Architecture is " ));
2905 switch (ehdr->e_machine) {
2906 case EM_386: IF_DEBUG(linker,debugBelch( "x86" )); break;
2907 #ifdef EM_SPARC32PLUS
2908 case EM_SPARC32PLUS:
2910 case EM_SPARC: IF_DEBUG(linker,debugBelch( "sparc" )); break;
2912 case EM_IA_64: IF_DEBUG(linker,debugBelch( "ia64" )); break;
2914 case EM_PPC: IF_DEBUG(linker,debugBelch( "powerpc32" )); break;
2916 case EM_X86_64: IF_DEBUG(linker,debugBelch( "x86_64" )); break;
2918 default: IF_DEBUG(linker,debugBelch( "unknown" ));
2919 errorBelch("%s: unknown architecture", oc->fileName);
2923 IF_DEBUG(linker,debugBelch(
2924 "\nSection header table: start %ld, n_entries %d, ent_size %d\n",
2925 (long)ehdr->e_shoff, ehdr->e_shnum, ehdr->e_shentsize ));
2927 ASSERT (ehdr->e_shentsize == sizeof(Elf_Shdr));
2929 shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
2931 if (ehdr->e_shstrndx == SHN_UNDEF) {
2932 errorBelch("%s: no section header string table", oc->fileName);
2935 IF_DEBUG(linker,debugBelch( "Section header string table is section %d\n",
2937 sh_strtab = ehdrC + shdr[ehdr->e_shstrndx].sh_offset;
2940 for (i = 0; i < ehdr->e_shnum; i++) {
2941 IF_DEBUG(linker,debugBelch("%2d: ", i ));
2942 IF_DEBUG(linker,debugBelch("type=%2d ", (int)shdr[i].sh_type ));
2943 IF_DEBUG(linker,debugBelch("size=%4d ", (int)shdr[i].sh_size ));
2944 IF_DEBUG(linker,debugBelch("offs=%4d ", (int)shdr[i].sh_offset ));
2945 IF_DEBUG(linker,debugBelch(" (%p .. %p) ",
2946 ehdrC + shdr[i].sh_offset,
2947 ehdrC + shdr[i].sh_offset + shdr[i].sh_size - 1));
2949 if (shdr[i].sh_type == SHT_REL) {
2950 IF_DEBUG(linker,debugBelch("Rel " ));
2951 } else if (shdr[i].sh_type == SHT_RELA) {
2952 IF_DEBUG(linker,debugBelch("RelA " ));
2954 IF_DEBUG(linker,debugBelch(" "));
2957 IF_DEBUG(linker,debugBelch("sname=%s\n", sh_strtab + shdr[i].sh_name ));
2961 IF_DEBUG(linker,debugBelch( "\nString tables" ));
2964 for (i = 0; i < ehdr->e_shnum; i++) {
2965 if (shdr[i].sh_type == SHT_STRTAB
2966 /* Ignore the section header's string table. */
2967 && i != ehdr->e_shstrndx
2968 /* Ignore string tables named .stabstr, as they contain
2970 && 0 != memcmp(".stabstr", sh_strtab + shdr[i].sh_name, 8)
2972 IF_DEBUG(linker,debugBelch(" section %d is a normal string table", i ));
2973 strtab = ehdrC + shdr[i].sh_offset;
2978 errorBelch("%s: no string tables, or too many", oc->fileName);
2983 IF_DEBUG(linker,debugBelch( "\nSymbol tables" ));
2984 for (i = 0; i < ehdr->e_shnum; i++) {
2985 if (shdr[i].sh_type != SHT_SYMTAB) continue;
2986 IF_DEBUG(linker,debugBelch( "section %d is a symbol table\n", i ));
2988 stab = (Elf_Sym*) (ehdrC + shdr[i].sh_offset);
2989 nent = shdr[i].sh_size / sizeof(Elf_Sym);
2990 IF_DEBUG(linker,debugBelch( " number of entries is apparently %d (%ld rem)\n",
2992 (long)shdr[i].sh_size % sizeof(Elf_Sym)
2994 if (0 != shdr[i].sh_size % sizeof(Elf_Sym)) {
2995 errorBelch("%s: non-integral number of symbol table entries", oc->fileName);
2998 for (j = 0; j < nent; j++) {
2999 IF_DEBUG(linker,debugBelch(" %2d ", j ));
3000 IF_DEBUG(linker,debugBelch(" sec=%-5d size=%-3d val=%5p ",
3001 (int)stab[j].st_shndx,
3002 (int)stab[j].st_size,
3003 (char*)stab[j].st_value ));
3005 IF_DEBUG(linker,debugBelch("type=" ));
3006 switch (ELF_ST_TYPE(stab[j].st_info)) {
3007 case STT_NOTYPE: IF_DEBUG(linker,debugBelch("notype " )); break;
3008 case STT_OBJECT: IF_DEBUG(linker,debugBelch("object " )); break;
3009 case STT_FUNC : IF_DEBUG(linker,debugBelch("func " )); break;
3010 case STT_SECTION: IF_DEBUG(linker,debugBelch("section" )); break;
3011 case STT_FILE: IF_DEBUG(linker,debugBelch("file " )); break;
3012 default: IF_DEBUG(linker,debugBelch("? " )); break;
3014 IF_DEBUG(linker,debugBelch(" " ));
3016 IF_DEBUG(linker,debugBelch("bind=" ));
3017 switch (ELF_ST_BIND(stab[j].st_info)) {
3018 case STB_LOCAL : IF_DEBUG(linker,debugBelch("local " )); break;
3019 case STB_GLOBAL: IF_DEBUG(linker,debugBelch("global" )); break;
3020 case STB_WEAK : IF_DEBUG(linker,debugBelch("weak " )); break;
3021 default: IF_DEBUG(linker,debugBelch("? " )); break;
3023 IF_DEBUG(linker,debugBelch(" " ));
3025 IF_DEBUG(linker,debugBelch("name=%s\n", strtab + stab[j].st_name ));
3029 if (nsymtabs == 0) {
3030 errorBelch("%s: didn't find any symbol tables", oc->fileName);
3037 static int getSectionKind_ELF( Elf_Shdr *hdr, int *is_bss )
3041 if (hdr->sh_type == SHT_PROGBITS
3042 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_EXECINSTR)) {
3043 /* .text-style section */
3044 return SECTIONKIND_CODE_OR_RODATA;
3047 if (hdr->sh_type == SHT_PROGBITS
3048 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_WRITE)) {
3049 /* .data-style section */
3050 return SECTIONKIND_RWDATA;
3053 if (hdr->sh_type == SHT_PROGBITS
3054 && (hdr->sh_flags & SHF_ALLOC) && !(hdr->sh_flags & SHF_WRITE)) {
3055 /* .rodata-style section */
3056 return SECTIONKIND_CODE_OR_RODATA;
3059 if (hdr->sh_type == SHT_NOBITS
3060 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_WRITE)) {
3061 /* .bss-style section */
3063 return SECTIONKIND_RWDATA;
3066 return SECTIONKIND_OTHER;
3071 ocGetNames_ELF ( ObjectCode* oc )
3076 char* ehdrC = (char*)(oc->image);
3077 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
3078 char* strtab = findElfSection ( ehdrC, SHT_STRTAB );
3079 Elf_Shdr* shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
3081 ASSERT(symhash != NULL);
3084 errorBelch("%s: no strtab", oc->fileName);
3089 for (i = 0; i < ehdr->e_shnum; i++) {
3090 /* Figure out what kind of section it is. Logic derived from
3091 Figure 1.14 ("Special Sections") of the ELF document
3092 ("Portable Formats Specification, Version 1.1"). */
3094 SectionKind kind = getSectionKind_ELF(&shdr[i], &is_bss);
3096 if (is_bss && shdr[i].sh_size > 0) {
3097 /* This is a non-empty .bss section. Allocate zeroed space for
3098 it, and set its .sh_offset field such that
3099 ehdrC + .sh_offset == addr_of_zeroed_space. */
3100 char* zspace = stgCallocBytes(1, shdr[i].sh_size,
3101 "ocGetNames_ELF(BSS)");
3102 shdr[i].sh_offset = ((char*)zspace) - ((char*)ehdrC);
3104 debugBelch("BSS section at 0x%x, size %d\n",
3105 zspace, shdr[i].sh_size);
3109 /* fill in the section info */
3110 if (kind != SECTIONKIND_OTHER && shdr[i].sh_size > 0) {
3111 addProddableBlock(oc, ehdrC + shdr[i].sh_offset, shdr[i].sh_size);
3112 addSection(oc, kind, ehdrC + shdr[i].sh_offset,
3113 ehdrC + shdr[i].sh_offset + shdr[i].sh_size - 1);
3116 if (shdr[i].sh_type != SHT_SYMTAB) continue;
3118 /* copy stuff into this module's object symbol table */
3119 stab = (Elf_Sym*) (ehdrC + shdr[i].sh_offset);
3120 nent = shdr[i].sh_size / sizeof(Elf_Sym);
3122 oc->n_symbols = nent;
3123 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
3124 "ocGetNames_ELF(oc->symbols)");
3126 for (j = 0; j < nent; j++) {
3128 char isLocal = FALSE; /* avoids uninit-var warning */
3130 char* nm = strtab + stab[j].st_name;
3131 int secno = stab[j].st_shndx;
3133 /* Figure out if we want to add it; if so, set ad to its
3134 address. Otherwise leave ad == NULL. */
3136 if (secno == SHN_COMMON) {
3138 ad = stgCallocBytes(1, stab[j].st_size, "ocGetNames_ELF(COMMON)");
3140 debugBelch("COMMON symbol, size %d name %s\n",
3141 stab[j].st_size, nm);
3143 /* Pointless to do addProddableBlock() for this area,
3144 since the linker should never poke around in it. */
3147 if ( ( ELF_ST_BIND(stab[j].st_info)==STB_GLOBAL
3148 || ELF_ST_BIND(stab[j].st_info)==STB_LOCAL
3150 /* and not an undefined symbol */
3151 && stab[j].st_shndx != SHN_UNDEF
3152 /* and not in a "special section" */
3153 && stab[j].st_shndx < SHN_LORESERVE
3155 /* and it's a not a section or string table or anything silly */
3156 ( ELF_ST_TYPE(stab[j].st_info)==STT_FUNC ||
3157 ELF_ST_TYPE(stab[j].st_info)==STT_OBJECT ||
3158 ELF_ST_TYPE(stab[j].st_info)==STT_NOTYPE
3161 /* Section 0 is the undefined section, hence > and not >=. */
3162 ASSERT(secno > 0 && secno < ehdr->e_shnum);
3164 if (shdr[secno].sh_type == SHT_NOBITS) {
3165 debugBelch(" BSS symbol, size %d off %d name %s\n",
3166 stab[j].st_size, stab[j].st_value, nm);
3169 ad = ehdrC + shdr[ secno ].sh_offset + stab[j].st_value;
3170 if (ELF_ST_BIND(stab[j].st_info)==STB_LOCAL) {
3173 #ifdef ELF_FUNCTION_DESC
3174 /* dlsym() and the initialisation table both give us function
3175 * descriptors, so to be consistent we store function descriptors
3176 * in the symbol table */
3177 if (ELF_ST_TYPE(stab[j].st_info) == STT_FUNC)
3178 ad = (char *)allocateFunctionDesc((Elf_Addr)ad);
3180 IF_DEBUG(linker,debugBelch( "addOTabName(GLOB): %10p %s %s",
3181 ad, oc->fileName, nm ));
3186 /* And the decision is ... */
3190 oc->symbols[j] = nm;
3193 /* Ignore entirely. */
3195 ghciInsertStrHashTable(oc->fileName, symhash, nm, ad);
3199 IF_DEBUG(linker,debugBelch( "skipping `%s'\n",
3200 strtab + stab[j].st_name ));
3203 "skipping bind = %d, type = %d, shndx = %d `%s'\n",
3204 (int)ELF_ST_BIND(stab[j].st_info),
3205 (int)ELF_ST_TYPE(stab[j].st_info),
3206 (int)stab[j].st_shndx,
3207 strtab + stab[j].st_name
3210 oc->symbols[j] = NULL;
3219 /* Do ELF relocations which lack an explicit addend. All x86-linux
3220 relocations appear to be of this form. */
3222 do_Elf_Rel_relocations ( ObjectCode* oc, char* ehdrC,
3223 Elf_Shdr* shdr, int shnum,
3224 Elf_Sym* stab, char* strtab )
3229 Elf_Rel* rtab = (Elf_Rel*) (ehdrC + shdr[shnum].sh_offset);
3230 int nent = shdr[shnum].sh_size / sizeof(Elf_Rel);
3231 int target_shndx = shdr[shnum].sh_info;
3232 int symtab_shndx = shdr[shnum].sh_link;
3234 stab = (Elf_Sym*) (ehdrC + shdr[ symtab_shndx ].sh_offset);
3235 targ = (Elf_Word*)(ehdrC + shdr[ target_shndx ].sh_offset);
3236 IF_DEBUG(linker,debugBelch( "relocations for section %d using symtab %d\n",
3237 target_shndx, symtab_shndx ));
3239 /* Skip sections that we're not interested in. */
3242 SectionKind kind = getSectionKind_ELF(&shdr[target_shndx], &is_bss);
3243 if (kind == SECTIONKIND_OTHER) {
3244 IF_DEBUG(linker,debugBelch( "skipping (target section not loaded)"));
3249 for (j = 0; j < nent; j++) {
3250 Elf_Addr offset = rtab[j].r_offset;
3251 Elf_Addr info = rtab[j].r_info;
3253 Elf_Addr P = ((Elf_Addr)targ) + offset;
3254 Elf_Word* pP = (Elf_Word*)P;
3259 StgStablePtr stablePtr;
3262 IF_DEBUG(linker,debugBelch( "Rel entry %3d is raw(%6p %6p)",
3263 j, (void*)offset, (void*)info ));
3265 IF_DEBUG(linker,debugBelch( " ZERO" ));
3268 Elf_Sym sym = stab[ELF_R_SYM(info)];
3269 /* First see if it is a local symbol. */
3270 if (ELF_ST_BIND(sym.st_info) == STB_LOCAL) {
3271 /* Yes, so we can get the address directly from the ELF symbol
3273 symbol = sym.st_name==0 ? "(noname)" : strtab+sym.st_name;
3275 (ehdrC + shdr[ sym.st_shndx ].sh_offset
3276 + stab[ELF_R_SYM(info)].st_value);
3279 symbol = strtab + sym.st_name;
3280 stablePtr = (StgStablePtr)lookupHashTable(stablehash, (StgWord)symbol);
3281 if (NULL == stablePtr) {
3282 /* No, so look up the name in our global table. */
3283 S_tmp = lookupSymbol( symbol );
3284 S = (Elf_Addr)S_tmp;
3286 stableVal = deRefStablePtr( stablePtr );
3287 addRootObject((void*)P);
3289 S = (Elf_Addr)S_tmp;
3293 errorBelch("%s: unknown symbol `%s'", oc->fileName, symbol);
3296 IF_DEBUG(linker,debugBelch( "`%s' resolves to %p\n", symbol, (void*)S ));
3299 IF_DEBUG(linker,debugBelch( "Reloc: P = %p S = %p A = %p\n",
3300 (void*)P, (void*)S, (void*)A ));
3301 checkProddableBlock ( oc, pP );
3305 switch (ELF_R_TYPE(info)) {
3306 # ifdef i386_HOST_ARCH
3307 case R_386_32: *pP = value; break;
3308 case R_386_PC32: *pP = value - P; break;
3311 errorBelch("%s: unhandled ELF relocation(Rel) type %lu\n",
3312 oc->fileName, (lnat)ELF_R_TYPE(info));
3320 /* Do ELF relocations for which explicit addends are supplied.
3321 sparc-solaris relocations appear to be of this form. */
3323 do_Elf_Rela_relocations ( ObjectCode* oc, char* ehdrC,
3324 Elf_Shdr* shdr, int shnum,
3325 Elf_Sym* stab, char* strtab )
3328 char *symbol = NULL;
3330 Elf_Rela* rtab = (Elf_Rela*) (ehdrC + shdr[shnum].sh_offset);
3331 int nent = shdr[shnum].sh_size / sizeof(Elf_Rela);
3332 int target_shndx = shdr[shnum].sh_info;
3333 int symtab_shndx = shdr[shnum].sh_link;
3335 stab = (Elf_Sym*) (ehdrC + shdr[ symtab_shndx ].sh_offset);
3336 targ = (Elf_Addr) (ehdrC + shdr[ target_shndx ].sh_offset);
3337 IF_DEBUG(linker,debugBelch( "relocations for section %d using symtab %d\n",
3338 target_shndx, symtab_shndx ));
3340 for (j = 0; j < nent; j++) {
3341 #if defined(DEBUG) || defined(sparc_HOST_ARCH) || defined(ia64_HOST_ARCH) || defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH)
3342 /* This #ifdef only serves to avoid unused-var warnings. */
3343 Elf_Addr offset = rtab[j].r_offset;
3344 Elf_Addr P = targ + offset;
3346 Elf_Addr info = rtab[j].r_info;
3347 Elf_Addr A = rtab[j].r_addend;
3351 # if defined(sparc_HOST_ARCH)
3352 Elf_Word* pP = (Elf_Word*)P;
3354 # elif defined(ia64_HOST_ARCH)
3355 Elf64_Xword *pP = (Elf64_Xword *)P;
3357 # elif defined(powerpc_HOST_ARCH)
3361 IF_DEBUG(linker,debugBelch( "Rel entry %3d is raw(%6p %6p %6p) ",
3362 j, (void*)offset, (void*)info,
3365 IF_DEBUG(linker,debugBelch( " ZERO" ));
3368 Elf_Sym sym = stab[ELF_R_SYM(info)];
3369 /* First see if it is a local symbol. */
3370 if (ELF_ST_BIND(sym.st_info) == STB_LOCAL) {
3371 /* Yes, so we can get the address directly from the ELF symbol
3373 symbol = sym.st_name==0 ? "(noname)" : strtab+sym.st_name;
3375 (ehdrC + shdr[ sym.st_shndx ].sh_offset
3376 + stab[ELF_R_SYM(info)].st_value);
3377 #ifdef ELF_FUNCTION_DESC
3378 /* Make a function descriptor for this function */
3379 if (S && ELF_ST_TYPE(sym.st_info) == STT_FUNC) {
3380 S = allocateFunctionDesc(S + A);
3385 /* No, so look up the name in our global table. */
3386 symbol = strtab + sym.st_name;
3387 S_tmp = lookupSymbol( symbol );
3388 S = (Elf_Addr)S_tmp;
3390 #ifdef ELF_FUNCTION_DESC
3391 /* If a function, already a function descriptor - we would
3392 have to copy it to add an offset. */
3393 if (S && (ELF_ST_TYPE(sym.st_info) == STT_FUNC) && (A != 0))
3394 errorBelch("%s: function %s with addend %p", oc->fileName, symbol, (void *)A);
3398 errorBelch("%s: unknown symbol `%s'", oc->fileName, symbol);
3401 IF_DEBUG(linker,debugBelch( "`%s' resolves to %p", symbol, (void*)S ));
3404 IF_DEBUG(linker,debugBelch("Reloc: P = %p S = %p A = %p\n",
3405 (void*)P, (void*)S, (void*)A ));
3406 /* checkProddableBlock ( oc, (void*)P ); */
3410 switch (ELF_R_TYPE(info)) {
3411 # if defined(sparc_HOST_ARCH)
3412 case R_SPARC_WDISP30:
3413 w1 = *pP & 0xC0000000;
3414 w2 = (Elf_Word)((value - P) >> 2);
3415 ASSERT((w2 & 0xC0000000) == 0);
3420 w1 = *pP & 0xFFC00000;
3421 w2 = (Elf_Word)(value >> 10);
3422 ASSERT((w2 & 0xFFC00000) == 0);
3428 w2 = (Elf_Word)(value & 0x3FF);
3429 ASSERT((w2 & ~0x3FF) == 0);
3433 /* According to the Sun documentation:
3435 This relocation type resembles R_SPARC_32, except it refers to an
3436 unaligned word. That is, the word to be relocated must be treated
3437 as four separate bytes with arbitrary alignment, not as a word
3438 aligned according to the architecture requirements.
3440 (JRS: which means that freeloading on the R_SPARC_32 case
3441 is probably wrong, but hey ...)
3445 w2 = (Elf_Word)value;
3448 # elif defined(ia64_HOST_ARCH)
3449 case R_IA64_DIR64LSB:
3450 case R_IA64_FPTR64LSB:
3453 case R_IA64_PCREL64LSB:
3456 case R_IA64_SEGREL64LSB:
3457 addr = findElfSegment(ehdrC, value);
3460 case R_IA64_GPREL22:
3461 ia64_reloc_gprel22(P, value);
3463 case R_IA64_LTOFF22:
3464 case R_IA64_LTOFF22X:
3465 case R_IA64_LTOFF_FPTR22:
3466 addr = allocateGOTEntry(value);
3467 ia64_reloc_gprel22(P, addr);
3469 case R_IA64_PCREL21B:
3470 ia64_reloc_pcrel21(P, S, oc);
3473 /* This goes with R_IA64_LTOFF22X and points to the load to
3474 * convert into a move. We don't implement relaxation. */
3476 # elif defined(powerpc_HOST_ARCH)
3477 case R_PPC_ADDR16_LO:
3478 *(Elf32_Half*) P = value;
3481 case R_PPC_ADDR16_HI:
3482 *(Elf32_Half*) P = value >> 16;
3485 case R_PPC_ADDR16_HA:
3486 *(Elf32_Half*) P = (value + 0x8000) >> 16;
3490 *(Elf32_Word *) P = value;
3494 *(Elf32_Word *) P = value - P;
3500 if( delta << 6 >> 6 != delta )
3502 value = makeJumpIsland( oc, ELF_R_SYM(info), value );
3505 if( value == 0 || delta << 6 >> 6 != delta )
3507 barf( "Unable to make ppcJumpIsland for #%d",
3513 *(Elf_Word *) P = (*(Elf_Word *) P & 0xfc000003)
3514 | (delta & 0x3fffffc);
3518 #if x86_64_HOST_ARCH
3520 *(Elf64_Xword *)P = value;
3525 StgInt64 off = value - P;
3526 if (off >= 0x7fffffffL || off < -0x80000000L) {
3527 barf("R_X86_64_PC32 relocation out of range: %s = %p",
3530 *(Elf64_Word *)P = (Elf64_Word)off;
3535 if (value >= 0x7fffffffL) {
3536 barf("R_X86_64_32 relocation out of range: %s = %p\n",
3539 *(Elf64_Word *)P = (Elf64_Word)value;
3543 if ((StgInt64)value > 0x7fffffffL || (StgInt64)value < -0x80000000L) {
3544 barf("R_X86_64_32S relocation out of range: %s = %p\n",
3547 *(Elf64_Sword *)P = (Elf64_Sword)value;
3552 errorBelch("%s: unhandled ELF relocation(RelA) type %lu\n",
3553 oc->fileName, (lnat)ELF_R_TYPE(info));
3562 ocResolve_ELF ( ObjectCode* oc )
3566 Elf_Sym* stab = NULL;
3567 char* ehdrC = (char*)(oc->image);
3568 Elf_Ehdr* ehdr = (Elf_Ehdr*) ehdrC;
3569 Elf_Shdr* shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
3571 /* first find "the" symbol table */
3572 stab = (Elf_Sym*) findElfSection ( ehdrC, SHT_SYMTAB );
3574 /* also go find the string table */
3575 strtab = findElfSection ( ehdrC, SHT_STRTAB );
3577 if (stab == NULL || strtab == NULL) {
3578 errorBelch("%s: can't find string or symbol table", oc->fileName);
3582 /* Process the relocation sections. */
3583 for (shnum = 0; shnum < ehdr->e_shnum; shnum++) {
3584 if (shdr[shnum].sh_type == SHT_REL) {
3585 ok = do_Elf_Rel_relocations ( oc, ehdrC, shdr,
3586 shnum, stab, strtab );
3590 if (shdr[shnum].sh_type == SHT_RELA) {
3591 ok = do_Elf_Rela_relocations ( oc, ehdrC, shdr,
3592 shnum, stab, strtab );
3597 /* Free the local symbol table; we won't need it again. */
3598 freeHashTable(oc->lochash, NULL);
3601 #if defined(powerpc_HOST_ARCH)
3602 ocFlushInstructionCache( oc );
3610 * Instructions are 41 bits long, packed into 128 bit bundles with a 5-bit template
3611 * at the front. The following utility functions pack and unpack instructions, and
3612 * take care of the most common relocations.
3615 #ifdef ia64_HOST_ARCH
3618 ia64_extract_instruction(Elf64_Xword *target)
3621 int slot = (Elf_Addr)target & 3;
3622 target = (Elf_Addr)target & ~3;
3630 return ((w1 >> 5) & 0x1ffffffffff);
3632 return (w1 >> 46) | ((w2 & 0x7fffff) << 18);
3636 barf("ia64_extract_instruction: invalid slot %p", target);
3641 ia64_deposit_instruction(Elf64_Xword *target, Elf64_Xword value)
3643 int slot = (Elf_Addr)target & 3;
3644 target = (Elf_Addr)target & ~3;
3649 *target |= value << 5;
3652 *target |= value << 46;
3653 *(target+1) |= value >> 18;
3656 *(target+1) |= value << 23;
3662 ia64_reloc_gprel22(Elf_Addr target, Elf_Addr value)
3664 Elf64_Xword instruction;
3665 Elf64_Sxword rel_value;
3667 rel_value = value - gp_val;
3668 if ((rel_value > 0x1fffff) || (rel_value < -0x1fffff))
3669 barf("GP-relative data out of range (address = 0x%lx, gp = 0x%lx)", value, gp_val);
3671 instruction = ia64_extract_instruction((Elf64_Xword *)target);
3672 instruction |= (((rel_value >> 0) & 0x07f) << 13) /* imm7b */
3673 | (((rel_value >> 7) & 0x1ff) << 27) /* imm9d */
3674 | (((rel_value >> 16) & 0x01f) << 22) /* imm5c */
3675 | ((Elf64_Xword)(rel_value < 0) << 36); /* s */
3676 ia64_deposit_instruction((Elf64_Xword *)target, instruction);
3680 ia64_reloc_pcrel21(Elf_Addr target, Elf_Addr value, ObjectCode *oc)
3682 Elf64_Xword instruction;
3683 Elf64_Sxword rel_value;
3686 entry = allocatePLTEntry(value, oc);
3688 rel_value = (entry >> 4) - (target >> 4);
3689 if ((rel_value > 0xfffff) || (rel_value < -0xfffff))
3690 barf("PLT entry too far away (entry = 0x%lx, target = 0x%lx)", entry, target);
3692 instruction = ia64_extract_instruction((Elf64_Xword *)target);
3693 instruction |= ((rel_value & 0xfffff) << 13) /* imm20b */
3694 | ((Elf64_Xword)(rel_value < 0) << 36); /* s */
3695 ia64_deposit_instruction((Elf64_Xword *)target, instruction);
3701 * PowerPC ELF specifics
3704 #ifdef powerpc_HOST_ARCH
3706 static int ocAllocateJumpIslands_ELF( ObjectCode *oc )
3712 ehdr = (Elf_Ehdr *) oc->image;
3713 shdr = (Elf_Shdr *) ( ((char *)oc->image) + ehdr->e_shoff );
3715 for( i = 0; i < ehdr->e_shnum; i++ )
3716 if( shdr[i].sh_type == SHT_SYMTAB )
3719 if( i == ehdr->e_shnum )
3721 errorBelch( "This ELF file contains no symtab" );
3725 if( shdr[i].sh_entsize != sizeof( Elf_Sym ) )
3727 errorBelch( "The entry size (%d) of the symtab isn't %d\n",
3728 shdr[i].sh_entsize, sizeof( Elf_Sym ) );
3733 return ocAllocateJumpIslands( oc, shdr[i].sh_size / sizeof( Elf_Sym ), 0 );
3736 #endif /* powerpc */
3740 /* --------------------------------------------------------------------------
3742 * ------------------------------------------------------------------------*/
3744 #if defined(OBJFORMAT_MACHO)
3747 Support for MachO linking on Darwin/MacOS X
3748 by Wolfgang Thaller (wolfgang.thaller@gmx.net)
3750 I hereby formally apologize for the hackish nature of this code.
3751 Things that need to be done:
3752 *) implement ocVerifyImage_MachO
3753 *) add still more sanity checks.
3756 #ifdef powerpc_HOST_ARCH
3757 static int ocAllocateJumpIslands_MachO(ObjectCode* oc)
3759 struct mach_header *header = (struct mach_header *) oc->image;
3760 struct load_command *lc = (struct load_command *) (header + 1);
3763 for( i = 0; i < header->ncmds; i++ )
3765 if( lc->cmd == LC_SYMTAB )
3767 // Find out the first and last undefined external
3768 // symbol, so we don't have to allocate too many
3770 struct symtab_command *symLC = (struct symtab_command *) lc;
3771 unsigned min = symLC->nsyms, max = 0;
3772 struct nlist *nlist =
3773 symLC ? (struct nlist*) ((char*) oc->image + symLC->symoff)
3775 for(i=0;i<symLC->nsyms;i++)
3777 if(nlist[i].n_type & N_STAB)
3779 else if(nlist[i].n_type & N_EXT)
3781 if((nlist[i].n_type & N_TYPE) == N_UNDF
3782 && (nlist[i].n_value == 0))
3792 return ocAllocateJumpIslands(oc, max - min + 1, min);
3797 lc = (struct load_command *) ( ((char *)lc) + lc->cmdsize );
3799 return ocAllocateJumpIslands(oc,0,0);
3803 static int ocVerifyImage_MachO(ObjectCode* oc STG_UNUSED)
3805 // FIXME: do some verifying here
3809 static int resolveImports(
3812 struct symtab_command *symLC,
3813 struct section *sect, // ptr to lazy or non-lazy symbol pointer section
3814 unsigned long *indirectSyms,
3815 struct nlist *nlist)
3818 size_t itemSize = 4;
3821 int isJumpTable = 0;
3822 if(!strcmp(sect->sectname,"__jump_table"))
3826 ASSERT(sect->reserved2 == itemSize);
3830 for(i=0; i*itemSize < sect->size;i++)
3832 // according to otool, reserved1 contains the first index into the indirect symbol table
3833 struct nlist *symbol = &nlist[indirectSyms[sect->reserved1+i]];
3834 char *nm = image + symLC->stroff + symbol->n_un.n_strx;
3837 if((symbol->n_type & N_TYPE) == N_UNDF
3838 && (symbol->n_type & N_EXT) && (symbol->n_value != 0))
3839 addr = (void*) (symbol->n_value);
3840 else if((addr = lookupLocalSymbol(oc,nm)) != NULL)
3843 addr = lookupSymbol(nm);
3846 errorBelch("\n%s: unknown symbol `%s'", oc->fileName, nm);
3854 checkProddableBlock(oc,image + sect->offset + i*itemSize);
3855 *(image + sect->offset + i*itemSize) = 0xe9; // jmp
3856 *(unsigned*)(image + sect->offset + i*itemSize + 1)
3857 = (char*)addr - (image + sect->offset + i*itemSize + 5);
3862 checkProddableBlock(oc,((void**)(image + sect->offset)) + i);
3863 ((void**)(image + sect->offset))[i] = addr;
3870 static unsigned long relocateAddress(
3873 struct section* sections,
3874 unsigned long address)
3877 for(i = 0; i < nSections; i++)
3879 if(sections[i].addr <= address
3880 && address < sections[i].addr + sections[i].size)
3882 return (unsigned long)oc->image
3883 + sections[i].offset + address - sections[i].addr;
3886 barf("Invalid Mach-O file:"
3887 "Address out of bounds while relocating object file");
3891 static int relocateSection(
3894 struct symtab_command *symLC, struct nlist *nlist,
3895 int nSections, struct section* sections, struct section *sect)
3897 struct relocation_info *relocs;
3900 if(!strcmp(sect->sectname,"__la_symbol_ptr"))
3902 else if(!strcmp(sect->sectname,"__nl_symbol_ptr"))
3904 else if(!strcmp(sect->sectname,"__la_sym_ptr2"))
3906 else if(!strcmp(sect->sectname,"__la_sym_ptr3"))
3910 relocs = (struct relocation_info*) (image + sect->reloff);
3914 if(relocs[i].r_address & R_SCATTERED)
3916 struct scattered_relocation_info *scat =
3917 (struct scattered_relocation_info*) &relocs[i];
3921 if(scat->r_length == 2)
3923 unsigned long word = 0;
3924 unsigned long* wordPtr = (unsigned long*) (image + sect->offset + scat->r_address);
3925 checkProddableBlock(oc,wordPtr);
3927 // Note on relocation types:
3928 // i386 uses the GENERIC_RELOC_* types,
3929 // while ppc uses special PPC_RELOC_* types.
3930 // *_RELOC_VANILLA and *_RELOC_PAIR have the same value
3931 // in both cases, all others are different.
3932 // Therefore, we use GENERIC_RELOC_VANILLA
3933 // and GENERIC_RELOC_PAIR instead of the PPC variants,
3934 // and use #ifdefs for the other types.
3936 // Step 1: Figure out what the relocated value should be
3937 if(scat->r_type == GENERIC_RELOC_VANILLA)
3939 word = *wordPtr + (unsigned long) relocateAddress(
3946 #ifdef powerpc_HOST_ARCH
3947 else if(scat->r_type == PPC_RELOC_SECTDIFF
3948 || scat->r_type == PPC_RELOC_LO16_SECTDIFF
3949 || scat->r_type == PPC_RELOC_HI16_SECTDIFF
3950 || scat->r_type == PPC_RELOC_HA16_SECTDIFF)
3952 else if(scat->r_type == GENERIC_RELOC_SECTDIFF)
3955 struct scattered_relocation_info *pair =
3956 (struct scattered_relocation_info*) &relocs[i+1];
3958 if(!pair->r_scattered || pair->r_type != GENERIC_RELOC_PAIR)
3959 barf("Invalid Mach-O file: "
3960 "RELOC_*_SECTDIFF not followed by RELOC_PAIR");
3962 word = (unsigned long)
3963 (relocateAddress(oc, nSections, sections, scat->r_value)
3964 - relocateAddress(oc, nSections, sections, pair->r_value));
3967 #ifdef powerpc_HOST_ARCH
3968 else if(scat->r_type == PPC_RELOC_HI16
3969 || scat->r_type == PPC_RELOC_LO16
3970 || scat->r_type == PPC_RELOC_HA16
3971 || scat->r_type == PPC_RELOC_LO14)
3972 { // these are generated by label+offset things
3973 struct relocation_info *pair = &relocs[i+1];
3974 if((pair->r_address & R_SCATTERED) || pair->r_type != PPC_RELOC_PAIR)
3975 barf("Invalid Mach-O file: "
3976 "PPC_RELOC_* not followed by PPC_RELOC_PAIR");
3978 if(scat->r_type == PPC_RELOC_LO16)
3980 word = ((unsigned short*) wordPtr)[1];
3981 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
3983 else if(scat->r_type == PPC_RELOC_LO14)
3985 barf("Unsupported Relocation: PPC_RELOC_LO14");
3986 word = ((unsigned short*) wordPtr)[1] & 0xFFFC;
3987 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
3989 else if(scat->r_type == PPC_RELOC_HI16)
3991 word = ((unsigned short*) wordPtr)[1] << 16;
3992 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF);
3994 else if(scat->r_type == PPC_RELOC_HA16)
3996 word = ((unsigned short*) wordPtr)[1] << 16;
3997 word += ((short)relocs[i+1].r_address & (short)0xFFFF);
4001 word += (unsigned long) relocateAddress(oc, nSections, sections, scat->r_value)
4008 continue; // ignore the others
4010 #ifdef powerpc_HOST_ARCH
4011 if(scat->r_type == GENERIC_RELOC_VANILLA
4012 || scat->r_type == PPC_RELOC_SECTDIFF)
4014 if(scat->r_type == GENERIC_RELOC_VANILLA
4015 || scat->r_type == GENERIC_RELOC_SECTDIFF)
4020 #ifdef powerpc_HOST_ARCH
4021 else if(scat->r_type == PPC_RELOC_LO16_SECTDIFF || scat->r_type == PPC_RELOC_LO16)
4023 ((unsigned short*) wordPtr)[1] = word & 0xFFFF;
4025 else if(scat->r_type == PPC_RELOC_HI16_SECTDIFF || scat->r_type == PPC_RELOC_HI16)
4027 ((unsigned short*) wordPtr)[1] = (word >> 16) & 0xFFFF;
4029 else if(scat->r_type == PPC_RELOC_HA16_SECTDIFF || scat->r_type == PPC_RELOC_HA16)
4031 ((unsigned short*) wordPtr)[1] = ((word >> 16) & 0xFFFF)
4032 + ((word & (1<<15)) ? 1 : 0);
4038 continue; // FIXME: I hope it's OK to ignore all the others.
4042 struct relocation_info *reloc = &relocs[i];
4043 if(reloc->r_pcrel && !reloc->r_extern)
4046 if(reloc->r_length == 2)
4048 unsigned long word = 0;
4049 #ifdef powerpc_HOST_ARCH
4050 unsigned long jumpIsland = 0;
4051 long offsetToJumpIsland = 0xBADBAD42; // initialise to bad value
4052 // to avoid warning and to catch
4056 unsigned long* wordPtr = (unsigned long*) (image + sect->offset + reloc->r_address);
4057 checkProddableBlock(oc,wordPtr);
4059 if(reloc->r_type == GENERIC_RELOC_VANILLA)
4063 #ifdef powerpc_HOST_ARCH
4064 else if(reloc->r_type == PPC_RELOC_LO16)
4066 word = ((unsigned short*) wordPtr)[1];
4067 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
4069 else if(reloc->r_type == PPC_RELOC_HI16)
4071 word = ((unsigned short*) wordPtr)[1] << 16;
4072 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF);
4074 else if(reloc->r_type == PPC_RELOC_HA16)
4076 word = ((unsigned short*) wordPtr)[1] << 16;
4077 word += ((short)relocs[i+1].r_address & (short)0xFFFF);
4079 else if(reloc->r_type == PPC_RELOC_BR24)
4082 word = (word & 0x03FFFFFC) | ((word & 0x02000000) ? 0xFC000000 : 0);
4086 if(!reloc->r_extern)
4089 sections[reloc->r_symbolnum-1].offset
4090 - sections[reloc->r_symbolnum-1].addr
4097 struct nlist *symbol = &nlist[reloc->r_symbolnum];
4098 char *nm = image + symLC->stroff + symbol->n_un.n_strx;
4099 void *symbolAddress = lookupSymbol(nm);
4102 errorBelch("\nunknown symbol `%s'", nm);
4108 #ifdef powerpc_HOST_ARCH
4109 // In the .o file, this should be a relative jump to NULL
4110 // and we'll change it to a relative jump to the symbol
4111 ASSERT(-word == reloc->r_address);
4112 jumpIsland = makeJumpIsland(oc,reloc->r_symbolnum,(unsigned long) symbolAddress);
4115 offsetToJumpIsland = word + jumpIsland
4116 - (((long)image) + sect->offset - sect->addr);
4119 word += (unsigned long) symbolAddress
4120 - (((long)image) + sect->offset - sect->addr);
4124 word += (unsigned long) symbolAddress;
4128 if(reloc->r_type == GENERIC_RELOC_VANILLA)
4133 #ifdef powerpc_HOST_ARCH
4134 else if(reloc->r_type == PPC_RELOC_LO16)
4136 ((unsigned short*) wordPtr)[1] = word & 0xFFFF;
4139 else if(reloc->r_type == PPC_RELOC_HI16)
4141 ((unsigned short*) wordPtr)[1] = (word >> 16) & 0xFFFF;
4144 else if(reloc->r_type == PPC_RELOC_HA16)
4146 ((unsigned short*) wordPtr)[1] = ((word >> 16) & 0xFFFF)
4147 + ((word & (1<<15)) ? 1 : 0);
4150 else if(reloc->r_type == PPC_RELOC_BR24)
4152 if((long)word > (long)0x01FFFFFF || (long)word < (long)0xFFE00000)
4154 // The branch offset is too large.
4155 // Therefore, we try to use a jump island.
4158 barf("unconditional relative branch out of range: "
4159 "no jump island available");
4162 word = offsetToJumpIsland;
4163 if((long)word > (long)0x01FFFFFF || (long)word < (long)0xFFE00000)
4164 barf("unconditional relative branch out of range: "
4165 "jump island out of range");
4167 *wordPtr = (*wordPtr & 0xFC000003) | (word & 0x03FFFFFC);
4172 barf("\nunknown relocation %d",reloc->r_type);
4179 static int ocGetNames_MachO(ObjectCode* oc)
4181 char *image = (char*) oc->image;
4182 struct mach_header *header = (struct mach_header*) image;
4183 struct load_command *lc = (struct load_command*) (image + sizeof(struct mach_header));
4184 unsigned i,curSymbol = 0;
4185 struct segment_command *segLC = NULL;
4186 struct section *sections;
4187 struct symtab_command *symLC = NULL;
4188 struct nlist *nlist;
4189 unsigned long commonSize = 0;
4190 char *commonStorage = NULL;
4191 unsigned long commonCounter;
4193 for(i=0;i<header->ncmds;i++)
4195 if(lc->cmd == LC_SEGMENT)
4196 segLC = (struct segment_command*) lc;
4197 else if(lc->cmd == LC_SYMTAB)
4198 symLC = (struct symtab_command*) lc;
4199 lc = (struct load_command *) ( ((char*)lc) + lc->cmdsize );
4202 sections = (struct section*) (segLC+1);
4203 nlist = symLC ? (struct nlist*) (image + symLC->symoff)
4206 for(i=0;i<segLC->nsects;i++)
4208 if(sections[i].size == 0)
4211 if((sections[i].flags & SECTION_TYPE) == S_ZEROFILL)
4213 char * zeroFillArea = stgCallocBytes(1,sections[i].size,
4214 "ocGetNames_MachO(common symbols)");
4215 sections[i].offset = zeroFillArea - image;
4218 if(!strcmp(sections[i].sectname,"__text"))
4219 addSection(oc, SECTIONKIND_CODE_OR_RODATA,
4220 (void*) (image + sections[i].offset),
4221 (void*) (image + sections[i].offset + sections[i].size));
4222 else if(!strcmp(sections[i].sectname,"__const"))
4223 addSection(oc, SECTIONKIND_RWDATA,
4224 (void*) (image + sections[i].offset),
4225 (void*) (image + sections[i].offset + sections[i].size));
4226 else if(!strcmp(sections[i].sectname,"__data"))
4227 addSection(oc, SECTIONKIND_RWDATA,
4228 (void*) (image + sections[i].offset),
4229 (void*) (image + sections[i].offset + sections[i].size));
4230 else if(!strcmp(sections[i].sectname,"__bss")
4231 || !strcmp(sections[i].sectname,"__common"))
4232 addSection(oc, SECTIONKIND_RWDATA,
4233 (void*) (image + sections[i].offset),
4234 (void*) (image + sections[i].offset + sections[i].size));
4236 addProddableBlock(oc, (void*) (image + sections[i].offset),
4240 // count external symbols defined here
4244 for(i=0;i<symLC->nsyms;i++)
4246 if(nlist[i].n_type & N_STAB)
4248 else if(nlist[i].n_type & N_EXT)
4250 if((nlist[i].n_type & N_TYPE) == N_UNDF
4251 && (nlist[i].n_value != 0))
4253 commonSize += nlist[i].n_value;
4256 else if((nlist[i].n_type & N_TYPE) == N_SECT)
4261 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
4262 "ocGetNames_MachO(oc->symbols)");
4266 for(i=0;i<symLC->nsyms;i++)
4268 if(nlist[i].n_type & N_STAB)
4270 else if((nlist[i].n_type & N_TYPE) == N_SECT)
4272 if(nlist[i].n_type & N_EXT)
4274 char *nm = image + symLC->stroff + nlist[i].n_un.n_strx;
4275 ghciInsertStrHashTable(oc->fileName, symhash, nm,
4277 + sections[nlist[i].n_sect-1].offset
4278 - sections[nlist[i].n_sect-1].addr
4279 + nlist[i].n_value);
4280 oc->symbols[curSymbol++] = nm;
4284 char *nm = image + symLC->stroff + nlist[i].n_un.n_strx;
4285 ghciInsertStrHashTable(oc->fileName, oc->lochash, nm,
4287 + sections[nlist[i].n_sect-1].offset
4288 - sections[nlist[i].n_sect-1].addr
4289 + nlist[i].n_value);
4295 commonStorage = stgCallocBytes(1,commonSize,"ocGetNames_MachO(common symbols)");
4296 commonCounter = (unsigned long)commonStorage;
4299 for(i=0;i<symLC->nsyms;i++)
4301 if((nlist[i].n_type & N_TYPE) == N_UNDF
4302 && (nlist[i].n_type & N_EXT) && (nlist[i].n_value != 0))
4304 char *nm = image + symLC->stroff + nlist[i].n_un.n_strx;
4305 unsigned long sz = nlist[i].n_value;
4307 nlist[i].n_value = commonCounter;
4309 ghciInsertStrHashTable(oc->fileName, symhash, nm,
4310 (void*)commonCounter);
4311 oc->symbols[curSymbol++] = nm;
4313 commonCounter += sz;
4320 static int ocResolve_MachO(ObjectCode* oc)
4322 char *image = (char*) oc->image;
4323 struct mach_header *header = (struct mach_header*) image;
4324 struct load_command *lc = (struct load_command*) (image + sizeof(struct mach_header));
4326 struct segment_command *segLC = NULL;
4327 struct section *sections;
4328 struct symtab_command *symLC = NULL;
4329 struct dysymtab_command *dsymLC = NULL;
4330 struct nlist *nlist;
4332 for(i=0;i<header->ncmds;i++)
4334 if(lc->cmd == LC_SEGMENT)
4335 segLC = (struct segment_command*) lc;
4336 else if(lc->cmd == LC_SYMTAB)
4337 symLC = (struct symtab_command*) lc;
4338 else if(lc->cmd == LC_DYSYMTAB)
4339 dsymLC = (struct dysymtab_command*) lc;
4340 lc = (struct load_command *) ( ((char*)lc) + lc->cmdsize );
4343 sections = (struct section*) (segLC+1);
4344 nlist = symLC ? (struct nlist*) (image + symLC->symoff)
4349 unsigned long *indirectSyms
4350 = (unsigned long*) (image + dsymLC->indirectsymoff);
4352 for(i=0;i<segLC->nsects;i++)
4354 if( !strcmp(sections[i].sectname,"__la_symbol_ptr")
4355 || !strcmp(sections[i].sectname,"__la_sym_ptr2")
4356 || !strcmp(sections[i].sectname,"__la_sym_ptr3"))
4358 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4361 else if(!strcmp(sections[i].sectname,"__nl_symbol_ptr")
4362 || !strcmp(sections[i].sectname,"__pointers"))
4364 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4367 else if(!strcmp(sections[i].sectname,"__jump_table"))
4369 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4375 for(i=0;i<segLC->nsects;i++)
4377 if(!relocateSection(oc,image,symLC,nlist,segLC->nsects,sections,§ions[i]))
4381 /* Free the local symbol table; we won't need it again. */
4382 freeHashTable(oc->lochash, NULL);
4385 #if defined (powerpc_HOST_ARCH)
4386 ocFlushInstructionCache( oc );
4392 #ifdef powerpc_HOST_ARCH
4394 * The Mach-O object format uses leading underscores. But not everywhere.
4395 * There is a small number of runtime support functions defined in
4396 * libcc_dynamic.a whose name does not have a leading underscore.
4397 * As a consequence, we can't get their address from C code.
4398 * We have to use inline assembler just to take the address of a function.
4402 static void machoInitSymbolsWithoutUnderscore()
4404 extern void* symbolsWithoutUnderscore[];
4405 void **p = symbolsWithoutUnderscore;
4406 __asm__ volatile(".globl _symbolsWithoutUnderscore\n.data\n_symbolsWithoutUnderscore:");
4410 __asm__ volatile(".long " # x);
4412 RTS_MACHO_NOUNDERLINE_SYMBOLS
4414 __asm__ volatile(".text");
4418 ghciInsertStrHashTable("(GHCi built-in symbols)", symhash, #x, *p++);
4420 RTS_MACHO_NOUNDERLINE_SYMBOLS
4427 * Figure out by how much to shift the entire Mach-O file in memory
4428 * when loading so that its single segment ends up 16-byte-aligned
4430 static int machoGetMisalignment( FILE * f )
4432 struct mach_header header;
4435 fread(&header, sizeof(header), 1, f);
4438 if(header.magic != MH_MAGIC)
4441 misalignment = (header.sizeofcmds + sizeof(header))
4444 return misalignment ? (16 - misalignment) : 0;