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>.
27 #include "LinkerInternals.h"
31 #include "RtsTypeable.h"
33 #ifdef HAVE_SYS_TYPES_H
34 #include <sys/types.h>
40 #ifdef HAVE_SYS_STAT_H
44 #if defined(HAVE_DLFCN_H)
48 #if defined(cygwin32_HOST_OS)
53 #ifdef HAVE_SYS_TIME_H
57 #include <sys/fcntl.h>
58 #include <sys/termios.h>
59 #include <sys/utime.h>
60 #include <sys/utsname.h>
64 #if defined(ia64_HOST_ARCH) || defined(openbsd_HOST_OS) || defined(linux_HOST_OS) || defined(freebsd_HOST_OS)
69 #if defined(openbsd_HOST_OS) || defined(linux_HOST_OS) || defined(freebsd_HOST_OS)
77 #if defined(linux_HOST_OS) || defined(solaris2_HOST_OS) || defined(freebsd_HOST_OS) || defined(netbsd_HOST_OS) || defined(openbsd_HOST_OS)
78 # define OBJFORMAT_ELF
79 #elif defined(cygwin32_HOST_OS) || defined (mingw32_HOST_OS)
80 # define OBJFORMAT_PEi386
83 #elif defined(darwin_HOST_OS)
84 # define OBJFORMAT_MACHO
85 # include <mach-o/loader.h>
86 # include <mach-o/nlist.h>
87 # include <mach-o/reloc.h>
88 # include <mach-o/dyld.h>
89 #if defined(powerpc_HOST_ARCH)
90 # include <mach-o/ppc/reloc.h>
94 /* Hash table mapping symbol names to Symbol */
95 static /*Str*/HashTable *symhash;
101 /* Hash table mapping symbol names to StgStablePtr */
102 static /*Str*/HashTable *stablehash;
103 rootEntry *root_ptr_table = NULL;
104 static rootEntry *root_ptr_free = NULL;
106 static unsigned int RPT_size = 0;
108 /* List of currently loaded objects */
109 ObjectCode *objects = NULL; /* initially empty */
111 #if defined(OBJFORMAT_ELF)
112 static int ocVerifyImage_ELF ( ObjectCode* oc );
113 static int ocGetNames_ELF ( ObjectCode* oc );
114 static int ocResolve_ELF ( ObjectCode* oc );
115 #if defined(powerpc_HOST_ARCH)
116 static int ocAllocateJumpIslands_ELF ( ObjectCode* oc );
118 #elif defined(OBJFORMAT_PEi386)
119 static int ocVerifyImage_PEi386 ( ObjectCode* oc );
120 static int ocGetNames_PEi386 ( ObjectCode* oc );
121 static int ocResolve_PEi386 ( ObjectCode* oc );
122 #elif defined(OBJFORMAT_MACHO)
123 static int ocVerifyImage_MachO ( ObjectCode* oc );
124 static int ocGetNames_MachO ( ObjectCode* oc );
125 static int ocResolve_MachO ( ObjectCode* oc );
127 static int machoGetMisalignment( FILE * );
128 #ifdef powerpc_HOST_ARCH
129 static int ocAllocateJumpIslands_MachO ( ObjectCode* oc );
130 static void machoInitSymbolsWithoutUnderscore( void );
134 #if defined(x86_64_HOST_ARCH)
135 static void*x86_64_high_symbol( char *lbl, void *addr );
138 /* -----------------------------------------------------------------------------
139 * Built-in symbols from the RTS
142 typedef struct _RtsSymbolVal {
149 #define Maybe_Stable_Names SymX(mkWeakzh_fast) \
150 SymX(makeStableNamezh_fast) \
151 SymX(finalizzeWeakzh_fast)
153 /* These are not available in GUM!!! -- HWL */
154 #define Maybe_Stable_Names
157 #if !defined (mingw32_HOST_OS)
158 #define RTS_POSIX_ONLY_SYMBOLS \
159 SymX(signal_handlers) \
160 SymX(stg_sig_install) \
164 #if defined (cygwin32_HOST_OS)
165 #define RTS_MINGW_ONLY_SYMBOLS /**/
166 /* Don't have the ability to read import libs / archives, so
167 * we have to stupidly list a lot of what libcygwin.a
170 #define RTS_CYGWIN_ONLY_SYMBOLS \
248 #elif !defined(mingw32_HOST_OS)
249 #define RTS_MINGW_ONLY_SYMBOLS /**/
250 #define RTS_CYGWIN_ONLY_SYMBOLS /**/
251 #else /* defined(mingw32_HOST_OS) */
252 #define RTS_POSIX_ONLY_SYMBOLS /**/
253 #define RTS_CYGWIN_ONLY_SYMBOLS /**/
255 /* Extra syms gen'ed by mingw-2's gcc-3.2: */
257 #define RTS_MINGW_EXTRA_SYMS \
258 Sym(_imp____mb_cur_max) \
261 #define RTS_MINGW_EXTRA_SYMS
264 /* These are statically linked from the mingw libraries into the ghc
265 executable, so we have to employ this hack. */
266 #define RTS_MINGW_ONLY_SYMBOLS \
267 SymX(asyncReadzh_fast) \
268 SymX(asyncWritezh_fast) \
269 SymX(asyncDoProczh_fast) \
281 SymX(getservbyname) \
282 SymX(getservbyport) \
283 SymX(getprotobynumber) \
284 SymX(getprotobyname) \
285 SymX(gethostbyname) \
286 SymX(gethostbyaddr) \
333 SymX(rts_InstallConsoleEvent) \
334 SymX(rts_ConsoleHandlerDone) \
336 Sym(_imp___timezone) \
346 RTS_MINGW_EXTRA_SYMS \
350 #if defined(darwin_TARGET_OS) && HAVE_PRINTF_LDBLSTUB
351 #define RTS_DARWIN_ONLY_SYMBOLS \
352 Sym(asprintf$LDBLStub) \
356 Sym(fprintf$LDBLStub) \
357 Sym(fscanf$LDBLStub) \
358 Sym(fwprintf$LDBLStub) \
359 Sym(fwscanf$LDBLStub) \
360 Sym(printf$LDBLStub) \
361 Sym(scanf$LDBLStub) \
362 Sym(snprintf$LDBLStub) \
363 Sym(sprintf$LDBLStub) \
364 Sym(sscanf$LDBLStub) \
365 Sym(strtold$LDBLStub) \
366 Sym(swprintf$LDBLStub) \
367 Sym(swscanf$LDBLStub) \
368 Sym(syslog$LDBLStub) \
369 Sym(vasprintf$LDBLStub) \
371 Sym(verrc$LDBLStub) \
372 Sym(verrx$LDBLStub) \
373 Sym(vfprintf$LDBLStub) \
374 Sym(vfscanf$LDBLStub) \
375 Sym(vfwprintf$LDBLStub) \
376 Sym(vfwscanf$LDBLStub) \
377 Sym(vprintf$LDBLStub) \
378 Sym(vscanf$LDBLStub) \
379 Sym(vsnprintf$LDBLStub) \
380 Sym(vsprintf$LDBLStub) \
381 Sym(vsscanf$LDBLStub) \
382 Sym(vswprintf$LDBLStub) \
383 Sym(vswscanf$LDBLStub) \
384 Sym(vsyslog$LDBLStub) \
385 Sym(vwarn$LDBLStub) \
386 Sym(vwarnc$LDBLStub) \
387 Sym(vwarnx$LDBLStub) \
388 Sym(vwprintf$LDBLStub) \
389 Sym(vwscanf$LDBLStub) \
391 Sym(warnc$LDBLStub) \
392 Sym(warnx$LDBLStub) \
393 Sym(wcstold$LDBLStub) \
394 Sym(wprintf$LDBLStub) \
397 #define RTS_DARWIN_ONLY_SYMBOLS
401 # define MAIN_CAP_SYM SymX(MainCapability)
403 # define MAIN_CAP_SYM
406 #if !defined(mingw32_HOST_OS)
407 #define RTS_USER_SIGNALS_SYMBOLS \
408 SymX(setIOManagerPipe)
410 #define RTS_USER_SIGNALS_SYMBOLS /* nothing */
413 #ifdef TABLES_NEXT_TO_CODE
414 #define RTS_RET_SYMBOLS /* nothing */
416 #define RTS_RET_SYMBOLS \
417 SymX(stg_enter_ret) \
418 SymX(stg_gc_fun_ret) \
425 SymX(stg_ap_pv_ret) \
426 SymX(stg_ap_pp_ret) \
427 SymX(stg_ap_ppv_ret) \
428 SymX(stg_ap_ppp_ret) \
429 SymX(stg_ap_pppv_ret) \
430 SymX(stg_ap_pppp_ret) \
431 SymX(stg_ap_ppppp_ret) \
432 SymX(stg_ap_pppppp_ret)
435 #define RTS_SYMBOLS \
438 SymX(stg_enter_info) \
439 SymX(stg_gc_void_info) \
440 SymX(__stg_gc_enter_1) \
441 SymX(stg_gc_noregs) \
442 SymX(stg_gc_unpt_r1_info) \
443 SymX(stg_gc_unpt_r1) \
444 SymX(stg_gc_unbx_r1_info) \
445 SymX(stg_gc_unbx_r1) \
446 SymX(stg_gc_f1_info) \
448 SymX(stg_gc_d1_info) \
450 SymX(stg_gc_l1_info) \
453 SymX(stg_gc_fun_info) \
455 SymX(stg_gc_gen_info) \
456 SymX(stg_gc_gen_hp) \
458 SymX(stg_gen_yield) \
459 SymX(stg_yield_noregs) \
460 SymX(stg_yield_to_interpreter) \
461 SymX(stg_gen_block) \
462 SymX(stg_block_noregs) \
464 SymX(stg_block_takemvar) \
465 SymX(stg_block_putmvar) \
466 SymX(stg_seq_frame_info) \
468 SymX(MallocFailHook) \
470 SymX(OutOfHeapHook) \
471 SymX(StackOverflowHook) \
472 SymX(__encodeDouble) \
473 SymX(__encodeFloat) \
477 SymX(__gmpz_cmp_si) \
478 SymX(__gmpz_cmp_ui) \
479 SymX(__gmpz_get_si) \
480 SymX(__gmpz_get_ui) \
481 SymX(__int_encodeDouble) \
482 SymX(__int_encodeFloat) \
483 SymX(andIntegerzh_fast) \
484 SymX(atomicallyzh_fast) \
488 SymX(blockAsyncExceptionszh_fast) \
490 SymX(catchRetryzh_fast) \
491 SymX(catchSTMzh_fast) \
493 SymX(closure_flags) \
495 SymX(cmpIntegerzh_fast) \
496 SymX(cmpIntegerIntzh_fast) \
497 SymX(complementIntegerzh_fast) \
498 SymX(createAdjustor) \
499 SymX(decodeDoublezh_fast) \
500 SymX(decodeFloatzh_fast) \
503 SymX(deRefWeakzh_fast) \
504 SymX(deRefStablePtrzh_fast) \
505 SymX(dirty_MUT_VAR) \
506 SymX(divExactIntegerzh_fast) \
507 SymX(divModIntegerzh_fast) \
509 SymX(forkOnzh_fast) \
511 SymX(forkOS_createThread) \
512 SymX(freeHaskellFunctionPtr) \
513 SymX(freeStablePtr) \
514 SymX(getOrSetTypeableStore) \
515 SymX(gcdIntegerzh_fast) \
516 SymX(gcdIntegerIntzh_fast) \
517 SymX(gcdIntzh_fast) \
526 SymX(hs_perform_gc) \
527 SymX(hs_free_stable_ptr) \
528 SymX(hs_free_fun_ptr) \
530 SymX(int2Integerzh_fast) \
531 SymX(integer2Intzh_fast) \
532 SymX(integer2Wordzh_fast) \
533 SymX(isCurrentThreadBoundzh_fast) \
534 SymX(isDoubleDenormalized) \
535 SymX(isDoubleInfinite) \
537 SymX(isDoubleNegativeZero) \
538 SymX(isEmptyMVarzh_fast) \
539 SymX(isFloatDenormalized) \
540 SymX(isFloatInfinite) \
542 SymX(isFloatNegativeZero) \
543 SymX(killThreadzh_fast) \
545 SymX(insertStableSymbol) \
548 SymX(makeStablePtrzh_fast) \
549 SymX(minusIntegerzh_fast) \
550 SymX(mkApUpd0zh_fast) \
551 SymX(myThreadIdzh_fast) \
552 SymX(labelThreadzh_fast) \
553 SymX(newArrayzh_fast) \
554 SymX(newBCOzh_fast) \
555 SymX(newByteArrayzh_fast) \
556 SymX_redirect(newCAF, newDynCAF) \
557 SymX(newMVarzh_fast) \
558 SymX(newMutVarzh_fast) \
559 SymX(newTVarzh_fast) \
560 SymX(atomicModifyMutVarzh_fast) \
561 SymX(newPinnedByteArrayzh_fast) \
563 SymX(orIntegerzh_fast) \
565 SymX(performMajorGC) \
566 SymX(plusIntegerzh_fast) \
569 SymX(putMVarzh_fast) \
570 SymX(quotIntegerzh_fast) \
571 SymX(quotRemIntegerzh_fast) \
573 SymX(raiseIOzh_fast) \
574 SymX(readTVarzh_fast) \
575 SymX(remIntegerzh_fast) \
576 SymX(resetNonBlockingFd) \
581 SymX(rts_checkSchedStatus) \
584 SymX(rts_evalLazyIO) \
585 SymX(rts_evalStableIO) \
589 SymX(rts_getDouble) \
594 SymX(rts_getFunPtr) \
595 SymX(rts_getStablePtr) \
596 SymX(rts_getThreadId) \
598 SymX(rts_getWord32) \
611 SymX(rts_mkStablePtr) \
619 SymX(rtsSupportsBoundThreads) \
620 SymX(__hscore_get_saved_termios) \
621 SymX(__hscore_set_saved_termios) \
623 SymX(startupHaskell) \
624 SymX(shutdownHaskell) \
625 SymX(shutdownHaskellAndExit) \
626 SymX(stable_ptr_table) \
627 SymX(stackOverflow) \
628 SymX(stg_CAF_BLACKHOLE_info) \
629 SymX(awakenBlockedQueue) \
630 SymX(stg_CHARLIKE_closure) \
631 SymX(stg_EMPTY_MVAR_info) \
632 SymX(stg_IND_STATIC_info) \
633 SymX(stg_INTLIKE_closure) \
634 SymX(stg_MUT_ARR_PTRS_DIRTY_info) \
635 SymX(stg_MUT_ARR_PTRS_FROZEN_info) \
636 SymX(stg_MUT_ARR_PTRS_FROZEN0_info) \
637 SymX(stg_WEAK_info) \
638 SymX(stg_ap_v_info) \
639 SymX(stg_ap_f_info) \
640 SymX(stg_ap_d_info) \
641 SymX(stg_ap_l_info) \
642 SymX(stg_ap_n_info) \
643 SymX(stg_ap_p_info) \
644 SymX(stg_ap_pv_info) \
645 SymX(stg_ap_pp_info) \
646 SymX(stg_ap_ppv_info) \
647 SymX(stg_ap_ppp_info) \
648 SymX(stg_ap_pppv_info) \
649 SymX(stg_ap_pppp_info) \
650 SymX(stg_ap_ppppp_info) \
651 SymX(stg_ap_pppppp_info) \
652 SymX(stg_ap_0_fast) \
653 SymX(stg_ap_v_fast) \
654 SymX(stg_ap_f_fast) \
655 SymX(stg_ap_d_fast) \
656 SymX(stg_ap_l_fast) \
657 SymX(stg_ap_n_fast) \
658 SymX(stg_ap_p_fast) \
659 SymX(stg_ap_pv_fast) \
660 SymX(stg_ap_pp_fast) \
661 SymX(stg_ap_ppv_fast) \
662 SymX(stg_ap_ppp_fast) \
663 SymX(stg_ap_pppv_fast) \
664 SymX(stg_ap_pppp_fast) \
665 SymX(stg_ap_ppppp_fast) \
666 SymX(stg_ap_pppppp_fast) \
667 SymX(stg_ap_1_upd_info) \
668 SymX(stg_ap_2_upd_info) \
669 SymX(stg_ap_3_upd_info) \
670 SymX(stg_ap_4_upd_info) \
671 SymX(stg_ap_5_upd_info) \
672 SymX(stg_ap_6_upd_info) \
673 SymX(stg_ap_7_upd_info) \
675 SymX(stg_sel_0_upd_info) \
676 SymX(stg_sel_10_upd_info) \
677 SymX(stg_sel_11_upd_info) \
678 SymX(stg_sel_12_upd_info) \
679 SymX(stg_sel_13_upd_info) \
680 SymX(stg_sel_14_upd_info) \
681 SymX(stg_sel_15_upd_info) \
682 SymX(stg_sel_1_upd_info) \
683 SymX(stg_sel_2_upd_info) \
684 SymX(stg_sel_3_upd_info) \
685 SymX(stg_sel_4_upd_info) \
686 SymX(stg_sel_5_upd_info) \
687 SymX(stg_sel_6_upd_info) \
688 SymX(stg_sel_7_upd_info) \
689 SymX(stg_sel_8_upd_info) \
690 SymX(stg_sel_9_upd_info) \
691 SymX(stg_upd_frame_info) \
692 SymX(suspendThread) \
693 SymX(takeMVarzh_fast) \
694 SymX(timesIntegerzh_fast) \
695 SymX(tryPutMVarzh_fast) \
696 SymX(tryTakeMVarzh_fast) \
697 SymX(unblockAsyncExceptionszh_fast) \
699 SymX(unsafeThawArrayzh_fast) \
700 SymX(waitReadzh_fast) \
701 SymX(waitWritezh_fast) \
702 SymX(word2Integerzh_fast) \
703 SymX(writeTVarzh_fast) \
704 SymX(xorIntegerzh_fast) \
706 SymX(stg_interp_constr_entry) \
707 SymX(stg_interp_constr1_entry) \
708 SymX(stg_interp_constr2_entry) \
709 SymX(stg_interp_constr3_entry) \
710 SymX(stg_interp_constr4_entry) \
711 SymX(stg_interp_constr5_entry) \
712 SymX(stg_interp_constr6_entry) \
713 SymX(stg_interp_constr7_entry) \
714 SymX(stg_interp_constr8_entry) \
717 SymX(getAllocations) \
720 RTS_USER_SIGNALS_SYMBOLS
722 #ifdef SUPPORT_LONG_LONGS
723 #define RTS_LONG_LONG_SYMS \
724 SymX(int64ToIntegerzh_fast) \
725 SymX(word64ToIntegerzh_fast)
727 #define RTS_LONG_LONG_SYMS /* nothing */
730 // 64-bit support functions in libgcc.a
731 #if defined(__GNUC__) && SIZEOF_VOID_P <= 4
732 #define RTS_LIBGCC_SYMBOLS \
742 #elif defined(ia64_HOST_ARCH)
743 #define RTS_LIBGCC_SYMBOLS \
751 #define RTS_LIBGCC_SYMBOLS
754 #if defined(darwin_HOST_OS) && defined(powerpc_HOST_ARCH)
755 // Symbols that don't have a leading underscore
756 // on Mac OS X. They have to receive special treatment,
757 // see machoInitSymbolsWithoutUnderscore()
758 #define RTS_MACHO_NOUNDERLINE_SYMBOLS \
763 /* entirely bogus claims about types of these symbols */
764 #define Sym(vvv) extern void vvv(void);
765 #define SymX(vvv) /**/
766 #define SymX_redirect(vvv,xxx) /**/
770 RTS_POSIX_ONLY_SYMBOLS
771 RTS_MINGW_ONLY_SYMBOLS
772 RTS_CYGWIN_ONLY_SYMBOLS
773 RTS_DARWIN_ONLY_SYMBOLS
779 #ifdef LEADING_UNDERSCORE
780 #define MAYBE_LEADING_UNDERSCORE_STR(s) ("_" s)
782 #define MAYBE_LEADING_UNDERSCORE_STR(s) (s)
785 #define Sym(vvv) { MAYBE_LEADING_UNDERSCORE_STR(#vvv), \
787 #define SymX(vvv) Sym(vvv)
789 // SymX_redirect allows us to redirect references to one symbol to
790 // another symbol. See newCAF/newDynCAF for an example.
791 #define SymX_redirect(vvv,xxx) \
792 { MAYBE_LEADING_UNDERSCORE_STR(#vvv), \
795 static RtsSymbolVal rtsSyms[] = {
799 RTS_POSIX_ONLY_SYMBOLS
800 RTS_MINGW_ONLY_SYMBOLS
801 RTS_CYGWIN_ONLY_SYMBOLS
803 #if defined(darwin_HOST_OS) && defined(i386_HOST_ARCH)
804 // dyld stub code contains references to this,
805 // but it should never be called because we treat
806 // lazy pointers as nonlazy.
807 { "dyld_stub_binding_helper", (void*)0xDEADBEEF },
809 { 0, 0 } /* sentinel */
813 /* -----------------------------------------------------------------------------
814 * Utilities for handling root pointers.
815 * -------------------------------------------------------------------------- */
818 #define INIT_RPT_SIZE 64
821 initFreeList(rootEntry *table, nat n, rootEntry *free)
825 for (p = table + n - 1; p >= table; p--) {
829 root_ptr_free = table;
833 initRootPtrTable(void)
838 RPT_size = INIT_RPT_SIZE;
839 root_ptr_table = stgMallocBytes(RPT_size * sizeof(rootEntry),
842 initFreeList(root_ptr_table,INIT_RPT_SIZE,NULL);
847 enlargeRootPtrTable(void)
849 nat old_RPT_size = RPT_size;
851 // 2nd and subsequent times
854 stgReallocBytes(root_ptr_table,
855 RPT_size * sizeof(rootEntry),
856 "enlargeRootPtrTable");
858 initFreeList(root_ptr_table + old_RPT_size, old_RPT_size, NULL);
862 addRootObject(void *addr)
866 if (root_ptr_free == NULL) {
867 enlargeRootPtrTable();
870 rt = root_ptr_free - root_ptr_table;
871 root_ptr_free = (rootEntry*)(root_ptr_free->addr);
872 root_ptr_table[rt].addr = addr;
875 /* -----------------------------------------------------------------------------
876 * Treat root pointers as roots for the garbage collector.
877 * -------------------------------------------------------------------------- */
880 markRootPtrTable(evac_fn evac)
882 rootEntry *p, *end_root_ptr_table;
885 end_root_ptr_table = &root_ptr_table[RPT_size];
887 for (p = root_ptr_table; p < end_root_ptr_table; p++) {
890 if (q && (q < (P_)root_ptr_table || q >= (P_)end_root_ptr_table)) {
891 evac((StgClosure **)p->addr);
896 /* -----------------------------------------------------------------------------
897 * End of utilities for handling root pointers.
898 * -------------------------------------------------------------------------- */
901 /* -----------------------------------------------------------------------------
902 * Insert symbols into hash tables, checking for duplicates.
904 static void ghciInsertStrHashTable ( char* obj_name,
910 if (lookupHashTable(table, (StgWord)key) == NULL)
912 insertStrHashTable(table, (StgWord)key, data);
917 "GHCi runtime linker: fatal error: I found a duplicate definition for symbol\n"
919 "whilst processing object file\n"
921 "This could be caused by:\n"
922 " * Loading two different object files which export the same symbol\n"
923 " * Specifying the same object file twice on the GHCi command line\n"
924 " * An incorrect `package.conf' entry, causing some object to be\n"
926 "GHCi cannot safely continue in this situation. Exiting now. Sorry.\n"
935 /* -----------------------------------------------------------------------------
936 * initialize the object linker
940 static int linker_init_done = 0 ;
942 #if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
943 static void *dl_prog_handle;
951 /* Make initLinker idempotent, so we can call it
952 before evey relevant operation; that means we
953 don't need to initialise the linker separately */
954 if (linker_init_done == 1) { return; } else {
955 linker_init_done = 1;
958 stablehash = allocStrHashTable();
959 symhash = allocStrHashTable();
961 /* populate the symbol table with stuff from the RTS */
962 for (sym = rtsSyms; sym->lbl != NULL; sym++) {
963 ghciInsertStrHashTable("(GHCi built-in symbols)",
964 symhash, sym->lbl, sym->addr);
966 # if defined(OBJFORMAT_MACHO) && defined(powerpc_HOST_ARCH)
967 machoInitSymbolsWithoutUnderscore();
970 # if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
971 # if defined(RTLD_DEFAULT)
972 dl_prog_handle = RTLD_DEFAULT;
974 dl_prog_handle = dlopen(NULL, RTLD_LAZY);
975 # endif /* RTLD_DEFAULT */
979 /* -----------------------------------------------------------------------------
980 * Loading DLL or .so dynamic libraries
981 * -----------------------------------------------------------------------------
983 * Add a DLL from which symbols may be found. In the ELF case, just
984 * do RTLD_GLOBAL-style add, so no further messing around needs to
985 * happen in order that symbols in the loaded .so are findable --
986 * lookupSymbol() will subsequently see them by dlsym on the program's
987 * dl-handle. Returns NULL if success, otherwise ptr to an err msg.
989 * In the PEi386 case, open the DLLs and put handles to them in a
990 * linked list. When looking for a symbol, try all handles in the
991 * list. This means that we need to load even DLLs that are guaranteed
992 * to be in the ghc.exe image already, just so we can get a handle
993 * to give to loadSymbol, so that we can find the symbols. For such
994 * libraries, the LoadLibrary call should be a no-op except for returning
999 #if defined(OBJFORMAT_PEi386)
1000 /* A record for storing handles into DLLs. */
1005 struct _OpenedDLL* next;
1010 /* A list thereof. */
1011 static OpenedDLL* opened_dlls = NULL;
1015 addDLL( char *dll_name )
1017 # if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
1018 /* ------------------- ELF DLL loader ------------------- */
1024 hdl= dlopen(dll_name, RTLD_NOW | RTLD_GLOBAL);
1027 /* dlopen failed; return a ptr to the error msg. */
1029 if (errmsg == NULL) errmsg = "addDLL: unknown error";
1036 # elif defined(OBJFORMAT_PEi386)
1037 /* ------------------- Win32 DLL loader ------------------- */
1045 /* debugBelch("\naddDLL; dll_name = `%s'\n", dll_name); */
1047 /* See if we've already got it, and ignore if so. */
1048 for (o_dll = opened_dlls; o_dll != NULL; o_dll = o_dll->next) {
1049 if (0 == strcmp(o_dll->name, dll_name))
1053 /* The file name has no suffix (yet) so that we can try
1054 both foo.dll and foo.drv
1056 The documentation for LoadLibrary says:
1057 If no file name extension is specified in the lpFileName
1058 parameter, the default library extension .dll is
1059 appended. However, the file name string can include a trailing
1060 point character (.) to indicate that the module name has no
1063 buf = stgMallocBytes(strlen(dll_name) + 10, "addDLL");
1064 sprintf(buf, "%s.DLL", dll_name);
1065 instance = LoadLibrary(buf);
1066 if (instance == NULL) {
1067 sprintf(buf, "%s.DRV", dll_name); // KAA: allow loading of drivers (like winspool.drv)
1068 instance = LoadLibrary(buf);
1069 if (instance == NULL) {
1072 /* LoadLibrary failed; return a ptr to the error msg. */
1073 return "addDLL: unknown error";
1078 /* Add this DLL to the list of DLLs in which to search for symbols. */
1079 o_dll = stgMallocBytes( sizeof(OpenedDLL), "addDLL" );
1080 o_dll->name = stgMallocBytes(1+strlen(dll_name), "addDLL");
1081 strcpy(o_dll->name, dll_name);
1082 o_dll->instance = instance;
1083 o_dll->next = opened_dlls;
1084 opened_dlls = o_dll;
1088 barf("addDLL: not implemented on this platform");
1092 /* -----------------------------------------------------------------------------
1093 * insert a stable symbol in the hash table
1097 insertStableSymbol(char* obj_name, char* key, StgPtr p)
1099 ghciInsertStrHashTable(obj_name, stablehash, key, getStablePtr(p));
1103 /* -----------------------------------------------------------------------------
1104 * insert a symbol in the hash table
1107 insertSymbol(char* obj_name, char* key, void* data)
1109 ghciInsertStrHashTable(obj_name, symhash, key, data);
1112 /* -----------------------------------------------------------------------------
1113 * lookup a symbol in the hash table
1116 lookupSymbol( char *lbl )
1120 ASSERT(symhash != NULL);
1121 val = lookupStrHashTable(symhash, lbl);
1124 # if defined(OBJFORMAT_ELF)
1125 # if defined(x86_64_HOST_ARCH)
1126 val = dlsym(dl_prog_handle, lbl);
1127 if (val >= (void *)0x80000000) {
1129 new_val = x86_64_high_symbol(lbl, val);
1130 IF_DEBUG(linker,debugBelch("lookupSymbol: relocating out of range symbol: %s = %p, now %p\n", lbl, val, new_val));
1136 return dlsym(dl_prog_handle, lbl);
1138 # elif defined(OBJFORMAT_MACHO)
1139 if(NSIsSymbolNameDefined(lbl)) {
1140 NSSymbol symbol = NSLookupAndBindSymbol(lbl);
1141 return NSAddressOfSymbol(symbol);
1145 # elif defined(OBJFORMAT_PEi386)
1148 for (o_dll = opened_dlls; o_dll != NULL; o_dll = o_dll->next) {
1149 /* debugBelch("look in %s for %s\n", o_dll->name, lbl); */
1150 if (lbl[0] == '_') {
1151 /* HACK: if the name has an initial underscore, try stripping
1152 it off & look that up first. I've yet to verify whether there's
1153 a Rule that governs whether an initial '_' *should always* be
1154 stripped off when mapping from import lib name to the DLL name.
1156 sym = GetProcAddress(o_dll->instance, (lbl+1));
1158 /*debugBelch("found %s in %s\n", lbl+1,o_dll->name);*/
1162 sym = GetProcAddress(o_dll->instance, lbl);
1164 /*debugBelch("found %s in %s\n", lbl,o_dll->name);*/
1179 __attribute((unused))
1181 lookupLocalSymbol( ObjectCode* oc, char *lbl )
1185 val = lookupStrHashTable(oc->lochash, lbl);
1195 /* -----------------------------------------------------------------------------
1196 * Debugging aid: look in GHCi's object symbol tables for symbols
1197 * within DELTA bytes of the specified address, and show their names.
1200 void ghci_enquire ( char* addr );
1202 void ghci_enquire ( char* addr )
1207 const int DELTA = 64;
1212 for (oc = objects; oc; oc = oc->next) {
1213 for (i = 0; i < oc->n_symbols; i++) {
1214 sym = oc->symbols[i];
1215 if (sym == NULL) continue;
1216 // debugBelch("enquire %p %p\n", sym, oc->lochash);
1218 if (oc->lochash != NULL) {
1219 a = lookupStrHashTable(oc->lochash, sym);
1222 a = lookupStrHashTable(symhash, sym);
1225 // debugBelch("ghci_enquire: can't find %s\n", sym);
1227 else if (addr-DELTA <= a && a <= addr+DELTA) {
1228 debugBelch("%p + %3d == `%s'\n", addr, (int)(a - addr), sym);
1235 #ifdef ia64_HOST_ARCH
1236 static unsigned int PLTSize(void);
1239 /* -----------------------------------------------------------------------------
1240 * Load an obj (populate the global symbol table, but don't resolve yet)
1242 * Returns: 1 if ok, 0 on error.
1245 loadObj( char *path )
1252 void *map_addr = NULL;
1259 /* debugBelch("loadObj %s\n", path ); */
1261 /* Check that we haven't already loaded this object.
1262 Ignore requests to load multiple times */
1266 for (o = objects; o; o = o->next) {
1267 if (0 == strcmp(o->fileName, path)) {
1269 break; /* don't need to search further */
1273 IF_DEBUG(linker, debugBelch(
1274 "GHCi runtime linker: warning: looks like you're trying to load the\n"
1275 "same object file twice:\n"
1277 "GHCi will ignore this, but be warned.\n"
1279 return 1; /* success */
1283 oc = stgMallocBytes(sizeof(ObjectCode), "loadObj(oc)");
1285 # if defined(OBJFORMAT_ELF)
1286 oc->formatName = "ELF";
1287 # elif defined(OBJFORMAT_PEi386)
1288 oc->formatName = "PEi386";
1289 # elif defined(OBJFORMAT_MACHO)
1290 oc->formatName = "Mach-O";
1293 barf("loadObj: not implemented on this platform");
1296 r = stat(path, &st);
1297 if (r == -1) { return 0; }
1299 /* sigh, strdup() isn't a POSIX function, so do it the long way */
1300 oc->fileName = stgMallocBytes( strlen(path)+1, "loadObj" );
1301 strcpy(oc->fileName, path);
1303 oc->fileSize = st.st_size;
1305 oc->sections = NULL;
1306 oc->lochash = allocStrHashTable();
1307 oc->proddables = NULL;
1309 /* chain it onto the list of objects */
1314 #define ROUND_UP(x,size) ((x + size - 1) & ~(size - 1))
1316 /* On many architectures malloc'd memory isn't executable, so we need to use mmap. */
1318 #if defined(openbsd_HOST_OS)
1319 fd = open(path, O_RDONLY, S_IRUSR);
1321 fd = open(path, O_RDONLY);
1324 barf("loadObj: can't open `%s'", path);
1326 pagesize = getpagesize();
1328 #ifdef ia64_HOST_ARCH
1329 /* The PLT needs to be right before the object */
1330 n = ROUND_UP(PLTSize(), pagesize);
1331 oc->plt = mmap(NULL, n, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
1332 if (oc->plt == MAP_FAILED)
1333 barf("loadObj: can't allocate PLT");
1336 map_addr = oc->plt + n;
1339 n = ROUND_UP(oc->fileSize, pagesize);
1341 /* Link objects into the lower 2Gb on x86_64. GHC assumes the
1342 * small memory model on this architecture (see gcc docs,
1345 #ifdef x86_64_HOST_ARCH
1346 #define EXTRA_MAP_FLAGS MAP_32BIT
1348 #define EXTRA_MAP_FLAGS 0
1351 oc->image = mmap(map_addr, n, PROT_EXEC|PROT_READ|PROT_WRITE,
1352 MAP_PRIVATE|EXTRA_MAP_FLAGS, fd, 0);
1353 if (oc->image == MAP_FAILED)
1354 barf("loadObj: can't map `%s'", path);
1358 #else /* !USE_MMAP */
1360 /* load the image into memory */
1361 f = fopen(path, "rb");
1363 barf("loadObj: can't read `%s'", path);
1365 #ifdef darwin_HOST_OS
1366 // In a Mach-O .o file, all sections can and will be misaligned
1367 // if the total size of the headers is not a multiple of the
1368 // desired alignment. This is fine for .o files that only serve
1369 // as input for the static linker, but it's not fine for us,
1370 // as SSE (used by gcc for floating point) and Altivec require
1371 // 16-byte alignment.
1372 // We calculate the correct alignment from the header before
1373 // reading the file, and then we misalign oc->image on purpose so
1374 // that the actual sections end up aligned again.
1375 misalignment = machoGetMisalignment(f);
1376 oc->misalignment = misalignment;
1381 oc->image = stgMallocBytes(oc->fileSize + misalignment, "loadObj(image)");
1382 oc->image += misalignment;
1384 n = fread ( oc->image, 1, oc->fileSize, f );
1385 if (n != oc->fileSize)
1386 barf("loadObj: error whilst reading `%s'", path);
1390 #endif /* USE_MMAP */
1392 # if defined(OBJFORMAT_MACHO) && defined(powerpc_HOST_ARCH)
1393 r = ocAllocateJumpIslands_MachO ( oc );
1394 if (!r) { return r; }
1395 # elif defined(OBJFORMAT_ELF) && defined(powerpc_HOST_ARCH)
1396 r = ocAllocateJumpIslands_ELF ( oc );
1397 if (!r) { return r; }
1400 /* verify the in-memory image */
1401 # if defined(OBJFORMAT_ELF)
1402 r = ocVerifyImage_ELF ( oc );
1403 # elif defined(OBJFORMAT_PEi386)
1404 r = ocVerifyImage_PEi386 ( oc );
1405 # elif defined(OBJFORMAT_MACHO)
1406 r = ocVerifyImage_MachO ( oc );
1408 barf("loadObj: no verify method");
1410 if (!r) { return r; }
1412 /* build the symbol list for this image */
1413 # if defined(OBJFORMAT_ELF)
1414 r = ocGetNames_ELF ( oc );
1415 # elif defined(OBJFORMAT_PEi386)
1416 r = ocGetNames_PEi386 ( oc );
1417 # elif defined(OBJFORMAT_MACHO)
1418 r = ocGetNames_MachO ( oc );
1420 barf("loadObj: no getNames method");
1422 if (!r) { return r; }
1424 /* loaded, but not resolved yet */
1425 oc->status = OBJECT_LOADED;
1430 /* -----------------------------------------------------------------------------
1431 * resolve all the currently unlinked objects in memory
1433 * Returns: 1 if ok, 0 on error.
1443 for (oc = objects; oc; oc = oc->next) {
1444 if (oc->status != OBJECT_RESOLVED) {
1445 # if defined(OBJFORMAT_ELF)
1446 r = ocResolve_ELF ( oc );
1447 # elif defined(OBJFORMAT_PEi386)
1448 r = ocResolve_PEi386 ( oc );
1449 # elif defined(OBJFORMAT_MACHO)
1450 r = ocResolve_MachO ( oc );
1452 barf("resolveObjs: not implemented on this platform");
1454 if (!r) { return r; }
1455 oc->status = OBJECT_RESOLVED;
1461 /* -----------------------------------------------------------------------------
1462 * delete an object from the pool
1465 unloadObj( char *path )
1467 ObjectCode *oc, *prev;
1469 ASSERT(symhash != NULL);
1470 ASSERT(objects != NULL);
1475 for (oc = objects; oc; prev = oc, oc = oc->next) {
1476 if (!strcmp(oc->fileName,path)) {
1478 /* Remove all the mappings for the symbols within this
1483 for (i = 0; i < oc->n_symbols; i++) {
1484 if (oc->symbols[i] != NULL) {
1485 removeStrHashTable(symhash, oc->symbols[i], NULL);
1493 prev->next = oc->next;
1496 /* We're going to leave this in place, in case there are
1497 any pointers from the heap into it: */
1498 /* stgFree(oc->image); */
1499 stgFree(oc->fileName);
1500 stgFree(oc->symbols);
1501 stgFree(oc->sections);
1502 /* The local hash table should have been freed at the end
1503 of the ocResolve_ call on it. */
1504 ASSERT(oc->lochash == NULL);
1510 errorBelch("unloadObj: can't find `%s' to unload", path);
1514 /* -----------------------------------------------------------------------------
1515 * Sanity checking. For each ObjectCode, maintain a list of address ranges
1516 * which may be prodded during relocation, and abort if we try and write
1517 * outside any of these.
1519 static void addProddableBlock ( ObjectCode* oc, void* start, int size )
1522 = stgMallocBytes(sizeof(ProddableBlock), "addProddableBlock");
1523 /* debugBelch("aPB %p %p %d\n", oc, start, size); */
1527 pb->next = oc->proddables;
1528 oc->proddables = pb;
1531 static void checkProddableBlock ( ObjectCode* oc, void* addr )
1534 for (pb = oc->proddables; pb != NULL; pb = pb->next) {
1535 char* s = (char*)(pb->start);
1536 char* e = s + pb->size - 1;
1537 char* a = (char*)addr;
1538 /* Assumes that the biggest fixup involves a 4-byte write. This
1539 probably needs to be changed to 8 (ie, +7) on 64-bit
1541 if (a >= s && (a+3) <= e) return;
1543 barf("checkProddableBlock: invalid fixup in runtime linker");
1546 /* -----------------------------------------------------------------------------
1547 * Section management.
1549 static void addSection ( ObjectCode* oc, SectionKind kind,
1550 void* start, void* end )
1552 Section* s = stgMallocBytes(sizeof(Section), "addSection");
1556 s->next = oc->sections;
1559 debugBelch("addSection: %p-%p (size %d), kind %d\n",
1560 start, ((char*)end)-1, end - start + 1, kind );
1565 /* --------------------------------------------------------------------------
1566 * PowerPC specifics (jump islands)
1567 * ------------------------------------------------------------------------*/
1569 #if defined(powerpc_HOST_ARCH)
1572 ocAllocateJumpIslands
1574 Allocate additional space at the end of the object file image to make room
1577 PowerPC relative branch instructions have a 24 bit displacement field.
1578 As PPC code is always 4-byte-aligned, this yields a +-32MB range.
1579 If a particular imported symbol is outside this range, we have to redirect
1580 the jump to a short piece of new code that just loads the 32bit absolute
1581 address and jumps there.
1582 This function just allocates space for one 16 byte ppcJumpIsland for every
1583 undefined symbol in the object file. The code for the islands is filled in by
1584 makeJumpIsland below.
1587 static int ocAllocateJumpIslands( ObjectCode* oc, int count, int first )
1593 int misalignment = 0;
1595 misalignment = oc->misalignment;
1600 // round up to the nearest 4
1601 aligned = (oc->fileSize + 3) & ~3;
1604 #ifndef linux_HOST_OS /* mremap is a linux extension */
1605 #error ocAllocateJumpIslands doesnt want USE_MMAP to be defined
1608 pagesize = getpagesize();
1609 n = ROUND_UP( oc->fileSize, pagesize );
1610 m = ROUND_UP( aligned + sizeof (ppcJumpIsland) * count, pagesize );
1612 /* If we have a half-page-size file and map one page of it then
1613 * the part of the page after the size of the file remains accessible.
1614 * If, however, we map in 2 pages, the 2nd page is not accessible
1615 * and will give a "Bus Error" on access. To get around this, we check
1616 * if we need any extra pages for the jump islands and map them in
1617 * anonymously. We must check that we actually require extra pages
1618 * otherwise the attempt to mmap 0 pages of anonymous memory will
1624 /* The effect of this mremap() call is only the ensure that we have
1625 * a sufficient number of virtually contiguous pages. As returned from
1626 * mremap, the pages past the end of the file are not backed. We give
1627 * them a backing by using MAP_FIXED to map in anonymous pages.
1629 oc->image = mremap( oc->image, n, m, MREMAP_MAYMOVE );
1631 if( oc->image == MAP_FAILED )
1633 errorBelch( "Unable to mremap for Jump Islands\n" );
1637 if( mmap( oc->image + n, m - n, PROT_READ | PROT_WRITE | PROT_EXEC,
1638 MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED, 0, 0 ) == MAP_FAILED )
1640 errorBelch( "Unable to mmap( MAP_FIXED ) for Jump Islands\n" );
1646 oc->image -= misalignment;
1647 oc->image = stgReallocBytes( oc->image,
1649 aligned + sizeof (ppcJumpIsland) * count,
1650 "ocAllocateJumpIslands" );
1651 oc->image += misalignment;
1652 #endif /* USE_MMAP */
1654 oc->jump_islands = (ppcJumpIsland *) (oc->image + aligned);
1655 memset( oc->jump_islands, 0, sizeof (ppcJumpIsland) * count );
1658 oc->jump_islands = NULL;
1660 oc->island_start_symbol = first;
1661 oc->n_islands = count;
1666 static unsigned long makeJumpIsland( ObjectCode* oc,
1667 unsigned long symbolNumber,
1668 unsigned long target )
1670 ppcJumpIsland *island;
1672 if( symbolNumber < oc->island_start_symbol ||
1673 symbolNumber - oc->island_start_symbol > oc->n_islands)
1676 island = &oc->jump_islands[symbolNumber - oc->island_start_symbol];
1678 // lis r12, hi16(target)
1679 island->lis_r12 = 0x3d80;
1680 island->hi_addr = target >> 16;
1682 // ori r12, r12, lo16(target)
1683 island->ori_r12_r12 = 0x618c;
1684 island->lo_addr = target & 0xffff;
1687 island->mtctr_r12 = 0x7d8903a6;
1690 island->bctr = 0x4e800420;
1692 return (unsigned long) island;
1696 ocFlushInstructionCache
1698 Flush the data & instruction caches.
1699 Because the PPC has split data/instruction caches, we have to
1700 do that whenever we modify code at runtime.
1703 static void ocFlushInstructionCache( ObjectCode *oc )
1705 int n = (oc->fileSize + sizeof( ppcJumpIsland ) * oc->n_islands + 3) / 4;
1706 unsigned long *p = (unsigned long *) oc->image;
1710 __asm__ volatile ( "dcbf 0,%0\n\t"
1718 __asm__ volatile ( "sync\n\t"
1724 /* --------------------------------------------------------------------------
1725 * PEi386 specifics (Win32 targets)
1726 * ------------------------------------------------------------------------*/
1728 /* The information for this linker comes from
1729 Microsoft Portable Executable
1730 and Common Object File Format Specification
1731 revision 5.1 January 1998
1732 which SimonM says comes from the MS Developer Network CDs.
1734 It can be found there (on older CDs), but can also be found
1737 http://www.microsoft.com/hwdev/hardware/PECOFF.asp
1739 (this is Rev 6.0 from February 1999).
1741 Things move, so if that fails, try searching for it via
1743 http://www.google.com/search?q=PE+COFF+specification
1745 The ultimate reference for the PE format is the Winnt.h
1746 header file that comes with the Platform SDKs; as always,
1747 implementations will drift wrt their documentation.
1749 A good background article on the PE format is Matt Pietrek's
1750 March 1994 article in Microsoft System Journal (MSJ)
1751 (Vol.9, No. 3): "Peering Inside the PE: A Tour of the
1752 Win32 Portable Executable File Format." The info in there
1753 has recently been updated in a two part article in
1754 MSDN magazine, issues Feb and March 2002,
1755 "Inside Windows: An In-Depth Look into the Win32 Portable
1756 Executable File Format"
1758 John Levine's book "Linkers and Loaders" contains useful
1763 #if defined(OBJFORMAT_PEi386)
1767 typedef unsigned char UChar;
1768 typedef unsigned short UInt16;
1769 typedef unsigned int UInt32;
1776 UInt16 NumberOfSections;
1777 UInt32 TimeDateStamp;
1778 UInt32 PointerToSymbolTable;
1779 UInt32 NumberOfSymbols;
1780 UInt16 SizeOfOptionalHeader;
1781 UInt16 Characteristics;
1785 #define sizeof_COFF_header 20
1792 UInt32 VirtualAddress;
1793 UInt32 SizeOfRawData;
1794 UInt32 PointerToRawData;
1795 UInt32 PointerToRelocations;
1796 UInt32 PointerToLinenumbers;
1797 UInt16 NumberOfRelocations;
1798 UInt16 NumberOfLineNumbers;
1799 UInt32 Characteristics;
1803 #define sizeof_COFF_section 40
1810 UInt16 SectionNumber;
1813 UChar NumberOfAuxSymbols;
1817 #define sizeof_COFF_symbol 18
1822 UInt32 VirtualAddress;
1823 UInt32 SymbolTableIndex;
1828 #define sizeof_COFF_reloc 10
1831 /* From PE spec doc, section 3.3.2 */
1832 /* Note use of MYIMAGE_* since IMAGE_* are already defined in
1833 windows.h -- for the same purpose, but I want to know what I'm
1835 #define MYIMAGE_FILE_RELOCS_STRIPPED 0x0001
1836 #define MYIMAGE_FILE_EXECUTABLE_IMAGE 0x0002
1837 #define MYIMAGE_FILE_DLL 0x2000
1838 #define MYIMAGE_FILE_SYSTEM 0x1000
1839 #define MYIMAGE_FILE_BYTES_REVERSED_HI 0x8000
1840 #define MYIMAGE_FILE_BYTES_REVERSED_LO 0x0080
1841 #define MYIMAGE_FILE_32BIT_MACHINE 0x0100
1843 /* From PE spec doc, section 5.4.2 and 5.4.4 */
1844 #define MYIMAGE_SYM_CLASS_EXTERNAL 2
1845 #define MYIMAGE_SYM_CLASS_STATIC 3
1846 #define MYIMAGE_SYM_UNDEFINED 0
1848 /* From PE spec doc, section 4.1 */
1849 #define MYIMAGE_SCN_CNT_CODE 0x00000020
1850 #define MYIMAGE_SCN_CNT_INITIALIZED_DATA 0x00000040
1851 #define MYIMAGE_SCN_LNK_NRELOC_OVFL 0x01000000
1853 /* From PE spec doc, section 5.2.1 */
1854 #define MYIMAGE_REL_I386_DIR32 0x0006
1855 #define MYIMAGE_REL_I386_REL32 0x0014
1858 /* We use myindex to calculate array addresses, rather than
1859 simply doing the normal subscript thing. That's because
1860 some of the above structs have sizes which are not
1861 a whole number of words. GCC rounds their sizes up to a
1862 whole number of words, which means that the address calcs
1863 arising from using normal C indexing or pointer arithmetic
1864 are just plain wrong. Sigh.
1867 myindex ( int scale, void* base, int index )
1870 ((UChar*)base) + scale * index;
1875 printName ( UChar* name, UChar* strtab )
1877 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
1878 UInt32 strtab_offset = * (UInt32*)(name+4);
1879 debugBelch("%s", strtab + strtab_offset );
1882 for (i = 0; i < 8; i++) {
1883 if (name[i] == 0) break;
1884 debugBelch("%c", name[i] );
1891 copyName ( UChar* name, UChar* strtab, UChar* dst, int dstSize )
1893 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
1894 UInt32 strtab_offset = * (UInt32*)(name+4);
1895 strncpy ( dst, strtab+strtab_offset, dstSize );
1901 if (name[i] == 0) break;
1911 cstring_from_COFF_symbol_name ( UChar* name, UChar* strtab )
1914 /* If the string is longer than 8 bytes, look in the
1915 string table for it -- this will be correctly zero terminated.
1917 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
1918 UInt32 strtab_offset = * (UInt32*)(name+4);
1919 return ((UChar*)strtab) + strtab_offset;
1921 /* Otherwise, if shorter than 8 bytes, return the original,
1922 which by defn is correctly terminated.
1924 if (name[7]==0) return name;
1925 /* The annoying case: 8 bytes. Copy into a temporary
1926 (which is never freed ...)
1928 newstr = stgMallocBytes(9, "cstring_from_COFF_symbol_name");
1930 strncpy(newstr,name,8);
1936 /* Just compares the short names (first 8 chars) */
1937 static COFF_section *
1938 findPEi386SectionCalled ( ObjectCode* oc, char* name )
1942 = (COFF_header*)(oc->image);
1943 COFF_section* sectab
1945 ((UChar*)(oc->image))
1946 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
1948 for (i = 0; i < hdr->NumberOfSections; i++) {
1951 COFF_section* section_i
1953 myindex ( sizeof_COFF_section, sectab, i );
1954 n1 = (UChar*) &(section_i->Name);
1956 if (n1[0]==n2[0] && n1[1]==n2[1] && n1[2]==n2[2] &&
1957 n1[3]==n2[3] && n1[4]==n2[4] && n1[5]==n2[5] &&
1958 n1[6]==n2[6] && n1[7]==n2[7])
1967 zapTrailingAtSign ( UChar* sym )
1969 # define my_isdigit(c) ((c) >= '0' && (c) <= '9')
1971 if (sym[0] == 0) return;
1973 while (sym[i] != 0) i++;
1976 while (j > 0 && my_isdigit(sym[j])) j--;
1977 if (j > 0 && sym[j] == '@' && j != i) sym[j] = 0;
1983 ocVerifyImage_PEi386 ( ObjectCode* oc )
1988 COFF_section* sectab;
1989 COFF_symbol* symtab;
1991 /* debugBelch("\nLOADING %s\n", oc->fileName); */
1992 hdr = (COFF_header*)(oc->image);
1993 sectab = (COFF_section*) (
1994 ((UChar*)(oc->image))
1995 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
1997 symtab = (COFF_symbol*) (
1998 ((UChar*)(oc->image))
1999 + hdr->PointerToSymbolTable
2001 strtab = ((UChar*)symtab)
2002 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
2004 if (hdr->Machine != 0x14c) {
2005 errorBelch("%s: Not x86 PEi386", oc->fileName);
2008 if (hdr->SizeOfOptionalHeader != 0) {
2009 errorBelch("%s: PEi386 with nonempty optional header", oc->fileName);
2012 if ( /* (hdr->Characteristics & MYIMAGE_FILE_RELOCS_STRIPPED) || */
2013 (hdr->Characteristics & MYIMAGE_FILE_EXECUTABLE_IMAGE) ||
2014 (hdr->Characteristics & MYIMAGE_FILE_DLL) ||
2015 (hdr->Characteristics & MYIMAGE_FILE_SYSTEM) ) {
2016 errorBelch("%s: Not a PEi386 object file", oc->fileName);
2019 if ( (hdr->Characteristics & MYIMAGE_FILE_BYTES_REVERSED_HI)
2020 /* || !(hdr->Characteristics & MYIMAGE_FILE_32BIT_MACHINE) */ ) {
2021 errorBelch("%s: Invalid PEi386 word size or endiannness: %d",
2023 (int)(hdr->Characteristics));
2026 /* If the string table size is way crazy, this might indicate that
2027 there are more than 64k relocations, despite claims to the
2028 contrary. Hence this test. */
2029 /* debugBelch("strtab size %d\n", * (UInt32*)strtab); */
2031 if ( (*(UInt32*)strtab) > 600000 ) {
2032 /* Note that 600k has no special significance other than being
2033 big enough to handle the almost-2MB-sized lumps that
2034 constitute HSwin32*.o. */
2035 debugBelch("PEi386 object has suspiciously large string table; > 64k relocs?");
2040 /* No further verification after this point; only debug printing. */
2042 IF_DEBUG(linker, i=1);
2043 if (i == 0) return 1;
2045 debugBelch( "sectab offset = %d\n", ((UChar*)sectab) - ((UChar*)hdr) );
2046 debugBelch( "symtab offset = %d\n", ((UChar*)symtab) - ((UChar*)hdr) );
2047 debugBelch( "strtab offset = %d\n", ((UChar*)strtab) - ((UChar*)hdr) );
2050 debugBelch( "Machine: 0x%x\n", (UInt32)(hdr->Machine) );
2051 debugBelch( "# sections: %d\n", (UInt32)(hdr->NumberOfSections) );
2052 debugBelch( "time/date: 0x%x\n", (UInt32)(hdr->TimeDateStamp) );
2053 debugBelch( "symtab offset: %d\n", (UInt32)(hdr->PointerToSymbolTable) );
2054 debugBelch( "# symbols: %d\n", (UInt32)(hdr->NumberOfSymbols) );
2055 debugBelch( "sz of opt hdr: %d\n", (UInt32)(hdr->SizeOfOptionalHeader) );
2056 debugBelch( "characteristics: 0x%x\n", (UInt32)(hdr->Characteristics) );
2058 /* Print the section table. */
2060 for (i = 0; i < hdr->NumberOfSections; i++) {
2062 COFF_section* sectab_i
2064 myindex ( sizeof_COFF_section, sectab, i );
2071 printName ( sectab_i->Name, strtab );
2081 sectab_i->VirtualSize,
2082 sectab_i->VirtualAddress,
2083 sectab_i->SizeOfRawData,
2084 sectab_i->PointerToRawData,
2085 sectab_i->NumberOfRelocations,
2086 sectab_i->PointerToRelocations,
2087 sectab_i->PointerToRawData
2089 reltab = (COFF_reloc*) (
2090 ((UChar*)(oc->image)) + sectab_i->PointerToRelocations
2093 if ( sectab_i->Characteristics & MYIMAGE_SCN_LNK_NRELOC_OVFL ) {
2094 /* If the relocation field (a short) has overflowed, the
2095 * real count can be found in the first reloc entry.
2097 * See Section 4.1 (last para) of the PE spec (rev6.0).
2099 COFF_reloc* rel = (COFF_reloc*)
2100 myindex ( sizeof_COFF_reloc, reltab, 0 );
2101 noRelocs = rel->VirtualAddress;
2104 noRelocs = sectab_i->NumberOfRelocations;
2108 for (; j < noRelocs; j++) {
2110 COFF_reloc* rel = (COFF_reloc*)
2111 myindex ( sizeof_COFF_reloc, reltab, j );
2113 " type 0x%-4x vaddr 0x%-8x name `",
2115 rel->VirtualAddress );
2116 sym = (COFF_symbol*)
2117 myindex ( sizeof_COFF_symbol, symtab, rel->SymbolTableIndex );
2118 /* Hmm..mysterious looking offset - what's it for? SOF */
2119 printName ( sym->Name, strtab -10 );
2126 debugBelch("string table has size 0x%x\n", * (UInt32*)strtab );
2127 debugBelch("---START of string table---\n");
2128 for (i = 4; i < *(Int32*)strtab; i++) {
2130 debugBelch("\n"); else
2131 debugBelch("%c", strtab[i] );
2133 debugBelch("--- END of string table---\n");
2138 COFF_symbol* symtab_i;
2139 if (i >= (Int32)(hdr->NumberOfSymbols)) break;
2140 symtab_i = (COFF_symbol*)
2141 myindex ( sizeof_COFF_symbol, symtab, i );
2147 printName ( symtab_i->Name, strtab );
2156 (Int32)(symtab_i->SectionNumber),
2157 (UInt32)symtab_i->Type,
2158 (UInt32)symtab_i->StorageClass,
2159 (UInt32)symtab_i->NumberOfAuxSymbols
2161 i += symtab_i->NumberOfAuxSymbols;
2171 ocGetNames_PEi386 ( ObjectCode* oc )
2174 COFF_section* sectab;
2175 COFF_symbol* symtab;
2182 hdr = (COFF_header*)(oc->image);
2183 sectab = (COFF_section*) (
2184 ((UChar*)(oc->image))
2185 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2187 symtab = (COFF_symbol*) (
2188 ((UChar*)(oc->image))
2189 + hdr->PointerToSymbolTable
2191 strtab = ((UChar*)(oc->image))
2192 + hdr->PointerToSymbolTable
2193 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
2195 /* Allocate space for any (local, anonymous) .bss sections. */
2197 for (i = 0; i < hdr->NumberOfSections; i++) {
2200 COFF_section* sectab_i
2202 myindex ( sizeof_COFF_section, sectab, i );
2203 if (0 != strcmp(sectab_i->Name, ".bss")) continue;
2204 /* sof 10/05: the PE spec text isn't too clear regarding what
2205 * the SizeOfRawData field is supposed to hold for object
2206 * file sections containing just uninitialized data -- for executables,
2207 * it is supposed to be zero; unclear what it's supposed to be
2208 * for object files. However, VirtualSize is guaranteed to be
2209 * zero for object files, which definitely suggests that SizeOfRawData
2210 * will be non-zero (where else would the size of this .bss section be
2211 * stored?) Looking at the COFF_section info for incoming object files,
2212 * this certainly appears to be the case.
2214 * => I suspect we've been incorrectly handling .bss sections in (relocatable)
2215 * object files up until now. This turned out to bite us with ghc-6.4.1's use
2216 * of gcc-3.4.x, which has started to emit initially-zeroed-out local 'static'
2217 * variable decls into to the .bss section. (The specific function in Q which
2218 * triggered this is libraries/base/cbits/dirUtils.c:__hscore_getFolderPath())
2220 if (sectab_i->VirtualSize == 0 && sectab_i->SizeOfRawData == 0) continue;
2221 /* This is a non-empty .bss section. Allocate zeroed space for
2222 it, and set its PointerToRawData field such that oc->image +
2223 PointerToRawData == addr_of_zeroed_space. */
2224 bss_sz = sectab_i->VirtualSize;
2225 if ( bss_sz < sectab_i->SizeOfRawData) { bss_sz = sectab_i->SizeOfRawData; }
2226 zspace = stgCallocBytes(1, bss_sz, "ocGetNames_PEi386(anonymous bss)");
2227 sectab_i->PointerToRawData = ((UChar*)zspace) - ((UChar*)(oc->image));
2228 addProddableBlock(oc, zspace, bss_sz);
2229 /* debugBelch("BSS anon section at 0x%x\n", zspace); */
2232 /* Copy section information into the ObjectCode. */
2234 for (i = 0; i < hdr->NumberOfSections; i++) {
2240 = SECTIONKIND_OTHER;
2241 COFF_section* sectab_i
2243 myindex ( sizeof_COFF_section, sectab, i );
2244 IF_DEBUG(linker, debugBelch("section name = %s\n", sectab_i->Name ));
2247 /* I'm sure this is the Right Way to do it. However, the
2248 alternative of testing the sectab_i->Name field seems to
2249 work ok with Cygwin.
2251 if (sectab_i->Characteristics & MYIMAGE_SCN_CNT_CODE ||
2252 sectab_i->Characteristics & MYIMAGE_SCN_CNT_INITIALIZED_DATA)
2253 kind = SECTIONKIND_CODE_OR_RODATA;
2256 if (0==strcmp(".text",sectab_i->Name) ||
2257 0==strcmp(".rdata",sectab_i->Name)||
2258 0==strcmp(".rodata",sectab_i->Name))
2259 kind = SECTIONKIND_CODE_OR_RODATA;
2260 if (0==strcmp(".data",sectab_i->Name) ||
2261 0==strcmp(".bss",sectab_i->Name))
2262 kind = SECTIONKIND_RWDATA;
2264 ASSERT(sectab_i->SizeOfRawData == 0 || sectab_i->VirtualSize == 0);
2265 sz = sectab_i->SizeOfRawData;
2266 if (sz < sectab_i->VirtualSize) sz = sectab_i->VirtualSize;
2268 start = ((UChar*)(oc->image)) + sectab_i->PointerToRawData;
2269 end = start + sz - 1;
2271 if (kind == SECTIONKIND_OTHER
2272 /* Ignore sections called which contain stabs debugging
2274 && 0 != strcmp(".stab", sectab_i->Name)
2275 && 0 != strcmp(".stabstr", sectab_i->Name)
2276 /* ignore constructor section for now */
2277 && 0 != strcmp(".ctors", sectab_i->Name)
2278 /* ignore section generated from .ident */
2279 && 0!= strcmp("/4", sectab_i->Name)
2281 errorBelch("Unknown PEi386 section name `%s' (while processing: %s)", sectab_i->Name, oc->fileName);
2285 if (kind != SECTIONKIND_OTHER && end >= start) {
2286 addSection(oc, kind, start, end);
2287 addProddableBlock(oc, start, end - start + 1);
2291 /* Copy exported symbols into the ObjectCode. */
2293 oc->n_symbols = hdr->NumberOfSymbols;
2294 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
2295 "ocGetNames_PEi386(oc->symbols)");
2296 /* Call me paranoid; I don't care. */
2297 for (i = 0; i < oc->n_symbols; i++)
2298 oc->symbols[i] = NULL;
2302 COFF_symbol* symtab_i;
2303 if (i >= (Int32)(hdr->NumberOfSymbols)) break;
2304 symtab_i = (COFF_symbol*)
2305 myindex ( sizeof_COFF_symbol, symtab, i );
2309 if (symtab_i->StorageClass == MYIMAGE_SYM_CLASS_EXTERNAL
2310 && symtab_i->SectionNumber != MYIMAGE_SYM_UNDEFINED) {
2311 /* This symbol is global and defined, viz, exported */
2312 /* for MYIMAGE_SYMCLASS_EXTERNAL
2313 && !MYIMAGE_SYM_UNDEFINED,
2314 the address of the symbol is:
2315 address of relevant section + offset in section
2317 COFF_section* sectabent
2318 = (COFF_section*) myindex ( sizeof_COFF_section,
2320 symtab_i->SectionNumber-1 );
2321 addr = ((UChar*)(oc->image))
2322 + (sectabent->PointerToRawData
2326 if (symtab_i->SectionNumber == MYIMAGE_SYM_UNDEFINED
2327 && symtab_i->Value > 0) {
2328 /* This symbol isn't in any section at all, ie, global bss.
2329 Allocate zeroed space for it. */
2330 addr = stgCallocBytes(1, symtab_i->Value,
2331 "ocGetNames_PEi386(non-anonymous bss)");
2332 addSection(oc, SECTIONKIND_RWDATA, addr,
2333 ((UChar*)addr) + symtab_i->Value - 1);
2334 addProddableBlock(oc, addr, symtab_i->Value);
2335 /* debugBelch("BSS section at 0x%x\n", addr); */
2338 if (addr != NULL ) {
2339 sname = cstring_from_COFF_symbol_name ( symtab_i->Name, strtab );
2340 /* debugBelch("addSymbol %p `%s \n", addr,sname); */
2341 IF_DEBUG(linker, debugBelch("addSymbol %p `%s'\n", addr,sname);)
2342 ASSERT(i >= 0 && i < oc->n_symbols);
2343 /* cstring_from_COFF_symbol_name always succeeds. */
2344 oc->symbols[i] = sname;
2345 ghciInsertStrHashTable(oc->fileName, symhash, sname, addr);
2349 "IGNORING symbol %d\n"
2353 printName ( symtab_i->Name, strtab );
2362 (Int32)(symtab_i->SectionNumber),
2363 (UInt32)symtab_i->Type,
2364 (UInt32)symtab_i->StorageClass,
2365 (UInt32)symtab_i->NumberOfAuxSymbols
2370 i += symtab_i->NumberOfAuxSymbols;
2379 ocResolve_PEi386 ( ObjectCode* oc )
2382 COFF_section* sectab;
2383 COFF_symbol* symtab;
2393 /* ToDo: should be variable-sized? But is at least safe in the
2394 sense of buffer-overrun-proof. */
2396 /* debugBelch("resolving for %s\n", oc->fileName); */
2398 hdr = (COFF_header*)(oc->image);
2399 sectab = (COFF_section*) (
2400 ((UChar*)(oc->image))
2401 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2403 symtab = (COFF_symbol*) (
2404 ((UChar*)(oc->image))
2405 + hdr->PointerToSymbolTable
2407 strtab = ((UChar*)(oc->image))
2408 + hdr->PointerToSymbolTable
2409 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
2411 for (i = 0; i < hdr->NumberOfSections; i++) {
2412 COFF_section* sectab_i
2414 myindex ( sizeof_COFF_section, sectab, i );
2417 ((UChar*)(oc->image)) + sectab_i->PointerToRelocations
2420 /* Ignore sections called which contain stabs debugging
2422 if (0 == strcmp(".stab", sectab_i->Name)
2423 || 0 == strcmp(".stabstr", sectab_i->Name)
2424 || 0 == strcmp(".ctors", sectab_i->Name))
2427 if ( sectab_i->Characteristics & MYIMAGE_SCN_LNK_NRELOC_OVFL ) {
2428 /* If the relocation field (a short) has overflowed, the
2429 * real count can be found in the first reloc entry.
2431 * See Section 4.1 (last para) of the PE spec (rev6.0).
2433 * Nov2003 update: the GNU linker still doesn't correctly
2434 * handle the generation of relocatable object files with
2435 * overflown relocations. Hence the output to warn of potential
2438 COFF_reloc* rel = (COFF_reloc*)
2439 myindex ( sizeof_COFF_reloc, reltab, 0 );
2440 noRelocs = rel->VirtualAddress;
2442 /* 10/05: we now assume (and check for) a GNU ld that is capable
2443 * of handling object files with (>2^16) of relocs.
2446 debugBelch("WARNING: Overflown relocation field (# relocs found: %u)\n",
2451 noRelocs = sectab_i->NumberOfRelocations;
2456 for (; j < noRelocs; j++) {
2458 COFF_reloc* reltab_j
2460 myindex ( sizeof_COFF_reloc, reltab, j );
2462 /* the location to patch */
2464 ((UChar*)(oc->image))
2465 + (sectab_i->PointerToRawData
2466 + reltab_j->VirtualAddress
2467 - sectab_i->VirtualAddress )
2469 /* the existing contents of pP */
2471 /* the symbol to connect to */
2472 sym = (COFF_symbol*)
2473 myindex ( sizeof_COFF_symbol,
2474 symtab, reltab_j->SymbolTableIndex );
2477 "reloc sec %2d num %3d: type 0x%-4x "
2478 "vaddr 0x%-8x name `",
2480 (UInt32)reltab_j->Type,
2481 reltab_j->VirtualAddress );
2482 printName ( sym->Name, strtab );
2483 debugBelch("'\n" ));
2485 if (sym->StorageClass == MYIMAGE_SYM_CLASS_STATIC) {
2486 COFF_section* section_sym
2487 = findPEi386SectionCalled ( oc, sym->Name );
2489 errorBelch("%s: can't find section `%s'", oc->fileName, sym->Name);
2492 S = ((UInt32)(oc->image))
2493 + (section_sym->PointerToRawData
2496 copyName ( sym->Name, strtab, symbol, 1000-1 );
2497 S = (UInt32) lookupLocalSymbol( oc, symbol );
2498 if ((void*)S != NULL) goto foundit;
2499 S = (UInt32) lookupSymbol( symbol );
2500 if ((void*)S != NULL) goto foundit;
2501 zapTrailingAtSign ( symbol );
2502 S = (UInt32) lookupLocalSymbol( oc, symbol );
2503 if ((void*)S != NULL) goto foundit;
2504 S = (UInt32) lookupSymbol( symbol );
2505 if ((void*)S != NULL) goto foundit;
2506 /* Newline first because the interactive linker has printed "linking..." */
2507 errorBelch("\n%s: unknown symbol `%s'", oc->fileName, symbol);
2511 checkProddableBlock(oc, pP);
2512 switch (reltab_j->Type) {
2513 case MYIMAGE_REL_I386_DIR32:
2516 case MYIMAGE_REL_I386_REL32:
2517 /* Tricky. We have to insert a displacement at
2518 pP which, when added to the PC for the _next_
2519 insn, gives the address of the target (S).
2520 Problem is to know the address of the next insn
2521 when we only know pP. We assume that this
2522 literal field is always the last in the insn,
2523 so that the address of the next insn is pP+4
2524 -- hence the constant 4.
2525 Also I don't know if A should be added, but so
2526 far it has always been zero.
2528 SOF 05/2005: 'A' (old contents of *pP) have been observed
2529 to contain values other than zero (the 'wx' object file
2530 that came with wxhaskell-0.9.4; dunno how it was compiled..).
2531 So, add displacement to old value instead of asserting
2532 A to be zero. Fixes wxhaskell-related crashes, and no other
2533 ill effects have been observed.
2535 Update: the reason why we're seeing these more elaborate
2536 relocations is due to a switch in how the NCG compiles SRTs
2537 and offsets to them from info tables. SRTs live in .(ro)data,
2538 while info tables live in .text, causing GAS to emit REL32/DISP32
2539 relocations with non-zero values. Adding the displacement is
2540 the right thing to do.
2542 *pP = S - ((UInt32)pP) - 4 + A;
2545 debugBelch("%s: unhandled PEi386 relocation type %d",
2546 oc->fileName, reltab_j->Type);
2553 IF_DEBUG(linker, debugBelch("completed %s", oc->fileName));
2557 #endif /* defined(OBJFORMAT_PEi386) */
2560 /* --------------------------------------------------------------------------
2562 * ------------------------------------------------------------------------*/
2564 #if defined(OBJFORMAT_ELF)
2569 #if defined(sparc_HOST_ARCH)
2570 # define ELF_TARGET_SPARC /* Used inside <elf.h> */
2571 #elif defined(i386_HOST_ARCH)
2572 # define ELF_TARGET_386 /* Used inside <elf.h> */
2573 #elif defined(x86_64_HOST_ARCH)
2574 # define ELF_TARGET_X64_64
2576 #elif defined (ia64_HOST_ARCH)
2577 # define ELF_TARGET_IA64 /* Used inside <elf.h> */
2579 # define ELF_FUNCTION_DESC /* calling convention uses function descriptors */
2580 # define ELF_NEED_GOT /* needs Global Offset Table */
2581 # define ELF_NEED_PLT /* needs Procedure Linkage Tables */
2584 #if !defined(openbsd_HOST_OS)
2587 /* openbsd elf has things in different places, with diff names */
2588 #include <elf_abi.h>
2589 #include <machine/reloc.h>
2590 #define R_386_32 RELOC_32
2591 #define R_386_PC32 RELOC_PC32
2595 * Define a set of types which can be used for both ELF32 and ELF64
2599 #define ELFCLASS ELFCLASS64
2600 #define Elf_Addr Elf64_Addr
2601 #define Elf_Word Elf64_Word
2602 #define Elf_Sword Elf64_Sword
2603 #define Elf_Ehdr Elf64_Ehdr
2604 #define Elf_Phdr Elf64_Phdr
2605 #define Elf_Shdr Elf64_Shdr
2606 #define Elf_Sym Elf64_Sym
2607 #define Elf_Rel Elf64_Rel
2608 #define Elf_Rela Elf64_Rela
2609 #define ELF_ST_TYPE ELF64_ST_TYPE
2610 #define ELF_ST_BIND ELF64_ST_BIND
2611 #define ELF_R_TYPE ELF64_R_TYPE
2612 #define ELF_R_SYM ELF64_R_SYM
2614 #define ELFCLASS ELFCLASS32
2615 #define Elf_Addr Elf32_Addr
2616 #define Elf_Word Elf32_Word
2617 #define Elf_Sword Elf32_Sword
2618 #define Elf_Ehdr Elf32_Ehdr
2619 #define Elf_Phdr Elf32_Phdr
2620 #define Elf_Shdr Elf32_Shdr
2621 #define Elf_Sym Elf32_Sym
2622 #define Elf_Rel Elf32_Rel
2623 #define Elf_Rela Elf32_Rela
2625 #define ELF_ST_TYPE ELF32_ST_TYPE
2628 #define ELF_ST_BIND ELF32_ST_BIND
2631 #define ELF_R_TYPE ELF32_R_TYPE
2634 #define ELF_R_SYM ELF32_R_SYM
2640 * Functions to allocate entries in dynamic sections. Currently we simply
2641 * preallocate a large number, and we don't check if a entry for the given
2642 * target already exists (a linear search is too slow). Ideally these
2643 * entries would be associated with symbols.
2646 /* These sizes sufficient to load HSbase + HShaskell98 + a few modules */
2647 #define GOT_SIZE 0x20000
2648 #define FUNCTION_TABLE_SIZE 0x10000
2649 #define PLT_SIZE 0x08000
2652 static Elf_Addr got[GOT_SIZE];
2653 static unsigned int gotIndex;
2654 static Elf_Addr gp_val = (Elf_Addr)got;
2657 allocateGOTEntry(Elf_Addr target)
2661 if (gotIndex >= GOT_SIZE)
2662 barf("Global offset table overflow");
2664 entry = &got[gotIndex++];
2666 return (Elf_Addr)entry;
2670 #ifdef ELF_FUNCTION_DESC
2676 static FunctionDesc functionTable[FUNCTION_TABLE_SIZE];
2677 static unsigned int functionTableIndex;
2680 allocateFunctionDesc(Elf_Addr target)
2682 FunctionDesc *entry;
2684 if (functionTableIndex >= FUNCTION_TABLE_SIZE)
2685 barf("Function table overflow");
2687 entry = &functionTable[functionTableIndex++];
2689 entry->gp = (Elf_Addr)gp_val;
2690 return (Elf_Addr)entry;
2694 copyFunctionDesc(Elf_Addr target)
2696 FunctionDesc *olddesc = (FunctionDesc *)target;
2697 FunctionDesc *newdesc;
2699 newdesc = (FunctionDesc *)allocateFunctionDesc(olddesc->ip);
2700 newdesc->gp = olddesc->gp;
2701 return (Elf_Addr)newdesc;
2706 #ifdef ia64_HOST_ARCH
2707 static void ia64_reloc_gprel22(Elf_Addr target, Elf_Addr value);
2708 static void ia64_reloc_pcrel21(Elf_Addr target, Elf_Addr value, ObjectCode *oc);
2710 static unsigned char plt_code[] =
2712 /* taken from binutils bfd/elfxx-ia64.c */
2713 0x0b, 0x78, 0x00, 0x02, 0x00, 0x24, /* [MMI] addl r15=0,r1;; */
2714 0x00, 0x41, 0x3c, 0x30, 0x28, 0xc0, /* ld8 r16=[r15],8 */
2715 0x01, 0x08, 0x00, 0x84, /* mov r14=r1;; */
2716 0x11, 0x08, 0x00, 0x1e, 0x18, 0x10, /* [MIB] ld8 r1=[r15] */
2717 0x60, 0x80, 0x04, 0x80, 0x03, 0x00, /* mov b6=r16 */
2718 0x60, 0x00, 0x80, 0x00 /* br.few b6;; */
2721 /* If we can't get to the function descriptor via gp, take a local copy of it */
2722 #define PLT_RELOC(code, target) { \
2723 Elf64_Sxword rel_value = target - gp_val; \
2724 if ((rel_value > 0x1fffff) || (rel_value < -0x1fffff)) \
2725 ia64_reloc_gprel22((Elf_Addr)code, copyFunctionDesc(target)); \
2727 ia64_reloc_gprel22((Elf_Addr)code, target); \
2732 unsigned char code[sizeof(plt_code)];
2736 allocatePLTEntry(Elf_Addr target, ObjectCode *oc)
2738 PLTEntry *plt = (PLTEntry *)oc->plt;
2741 if (oc->pltIndex >= PLT_SIZE)
2742 barf("Procedure table overflow");
2744 entry = &plt[oc->pltIndex++];
2745 memcpy(entry->code, plt_code, sizeof(entry->code));
2746 PLT_RELOC(entry->code, target);
2747 return (Elf_Addr)entry;
2753 return (PLT_SIZE * sizeof(PLTEntry));
2758 #if x86_64_HOST_ARCH
2759 // On x86_64, 32-bit relocations are often used, which requires that
2760 // we can resolve a symbol to a 32-bit offset. However, shared
2761 // libraries are placed outside the 2Gb area, which leaves us with a
2762 // problem when we need to give a 32-bit offset to a symbol in a
2765 // For a function symbol, we can allocate a bounce sequence inside the
2766 // 2Gb area and resolve the symbol to this. The bounce sequence is
2767 // simply a long jump instruction to the real location of the symbol.
2769 // For data references, we're screwed.
2772 unsigned char jmp[8]; /* 6 byte instruction: jmpq *0x00000002(%rip) */
2776 #define X86_64_BB_SIZE 1024
2778 static x86_64_bounce *x86_64_bounce_buffer = NULL;
2779 static nat x86_64_bb_next_off;
2782 x86_64_high_symbol( char *lbl, void *addr )
2784 x86_64_bounce *bounce;
2786 if ( x86_64_bounce_buffer == NULL ||
2787 x86_64_bb_next_off >= X86_64_BB_SIZE ) {
2788 x86_64_bounce_buffer =
2789 mmap(NULL, X86_64_BB_SIZE * sizeof(x86_64_bounce),
2790 PROT_EXEC|PROT_READ|PROT_WRITE,
2791 MAP_PRIVATE|MAP_32BIT|MAP_ANONYMOUS, -1, 0);
2792 if (x86_64_bounce_buffer == MAP_FAILED) {
2793 barf("x86_64_high_symbol: mmap failed");
2795 x86_64_bb_next_off = 0;
2797 bounce = &x86_64_bounce_buffer[x86_64_bb_next_off];
2798 bounce->jmp[0] = 0xff;
2799 bounce->jmp[1] = 0x25;
2800 bounce->jmp[2] = 0x02;
2801 bounce->jmp[3] = 0x00;
2802 bounce->jmp[4] = 0x00;
2803 bounce->jmp[5] = 0x00;
2804 bounce->addr = addr;
2805 x86_64_bb_next_off++;
2807 IF_DEBUG(linker, debugBelch("x86_64: allocated bounce entry for %s->%p at %p\n",
2808 lbl, addr, bounce));
2810 insertStrHashTable(symhash, lbl, bounce);
2817 * Generic ELF functions
2821 findElfSection ( void* objImage, Elf_Word sh_type )
2823 char* ehdrC = (char*)objImage;
2824 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2825 Elf_Shdr* shdr = (Elf_Shdr*)(ehdrC + ehdr->e_shoff);
2826 char* sh_strtab = ehdrC + shdr[ehdr->e_shstrndx].sh_offset;
2830 for (i = 0; i < ehdr->e_shnum; i++) {
2831 if (shdr[i].sh_type == sh_type
2832 /* Ignore the section header's string table. */
2833 && i != ehdr->e_shstrndx
2834 /* Ignore string tables named .stabstr, as they contain
2836 && 0 != memcmp(".stabstr", sh_strtab + shdr[i].sh_name, 8)
2838 ptr = ehdrC + shdr[i].sh_offset;
2845 #if defined(ia64_HOST_ARCH)
2847 findElfSegment ( void* objImage, Elf_Addr vaddr )
2849 char* ehdrC = (char*)objImage;
2850 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2851 Elf_Phdr* phdr = (Elf_Phdr*)(ehdrC + ehdr->e_phoff);
2852 Elf_Addr segaddr = 0;
2855 for (i = 0; i < ehdr->e_phnum; i++) {
2856 segaddr = phdr[i].p_vaddr;
2857 if ((vaddr >= segaddr) && (vaddr < segaddr + phdr[i].p_memsz))
2865 ocVerifyImage_ELF ( ObjectCode* oc )
2869 int i, j, nent, nstrtab, nsymtabs;
2873 char* ehdrC = (char*)(oc->image);
2874 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2876 if (ehdr->e_ident[EI_MAG0] != ELFMAG0 ||
2877 ehdr->e_ident[EI_MAG1] != ELFMAG1 ||
2878 ehdr->e_ident[EI_MAG2] != ELFMAG2 ||
2879 ehdr->e_ident[EI_MAG3] != ELFMAG3) {
2880 errorBelch("%s: not an ELF object", oc->fileName);
2884 if (ehdr->e_ident[EI_CLASS] != ELFCLASS) {
2885 errorBelch("%s: unsupported ELF format", oc->fileName);
2889 if (ehdr->e_ident[EI_DATA] == ELFDATA2LSB) {
2890 IF_DEBUG(linker,debugBelch( "Is little-endian\n" ));
2892 if (ehdr->e_ident[EI_DATA] == ELFDATA2MSB) {
2893 IF_DEBUG(linker,debugBelch( "Is big-endian\n" ));
2895 errorBelch("%s: unknown endiannness", oc->fileName);
2899 if (ehdr->e_type != ET_REL) {
2900 errorBelch("%s: not a relocatable object (.o) file", oc->fileName);
2903 IF_DEBUG(linker, debugBelch( "Is a relocatable object (.o) file\n" ));
2905 IF_DEBUG(linker,debugBelch( "Architecture is " ));
2906 switch (ehdr->e_machine) {
2907 case EM_386: IF_DEBUG(linker,debugBelch( "x86" )); break;
2908 #ifdef EM_SPARC32PLUS
2909 case EM_SPARC32PLUS:
2911 case EM_SPARC: IF_DEBUG(linker,debugBelch( "sparc" )); break;
2913 case EM_IA_64: IF_DEBUG(linker,debugBelch( "ia64" )); break;
2915 case EM_PPC: IF_DEBUG(linker,debugBelch( "powerpc32" )); break;
2917 case EM_X86_64: IF_DEBUG(linker,debugBelch( "x86_64" )); break;
2919 default: IF_DEBUG(linker,debugBelch( "unknown" ));
2920 errorBelch("%s: unknown architecture", oc->fileName);
2924 IF_DEBUG(linker,debugBelch(
2925 "\nSection header table: start %ld, n_entries %d, ent_size %d\n",
2926 (long)ehdr->e_shoff, ehdr->e_shnum, ehdr->e_shentsize ));
2928 ASSERT (ehdr->e_shentsize == sizeof(Elf_Shdr));
2930 shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
2932 if (ehdr->e_shstrndx == SHN_UNDEF) {
2933 errorBelch("%s: no section header string table", oc->fileName);
2936 IF_DEBUG(linker,debugBelch( "Section header string table is section %d\n",
2938 sh_strtab = ehdrC + shdr[ehdr->e_shstrndx].sh_offset;
2941 for (i = 0; i < ehdr->e_shnum; i++) {
2942 IF_DEBUG(linker,debugBelch("%2d: ", i ));
2943 IF_DEBUG(linker,debugBelch("type=%2d ", (int)shdr[i].sh_type ));
2944 IF_DEBUG(linker,debugBelch("size=%4d ", (int)shdr[i].sh_size ));
2945 IF_DEBUG(linker,debugBelch("offs=%4d ", (int)shdr[i].sh_offset ));
2946 IF_DEBUG(linker,debugBelch(" (%p .. %p) ",
2947 ehdrC + shdr[i].sh_offset,
2948 ehdrC + shdr[i].sh_offset + shdr[i].sh_size - 1));
2950 if (shdr[i].sh_type == SHT_REL) {
2951 IF_DEBUG(linker,debugBelch("Rel " ));
2952 } else if (shdr[i].sh_type == SHT_RELA) {
2953 IF_DEBUG(linker,debugBelch("RelA " ));
2955 IF_DEBUG(linker,debugBelch(" "));
2958 IF_DEBUG(linker,debugBelch("sname=%s\n", sh_strtab + shdr[i].sh_name ));
2962 IF_DEBUG(linker,debugBelch( "\nString tables" ));
2965 for (i = 0; i < ehdr->e_shnum; i++) {
2966 if (shdr[i].sh_type == SHT_STRTAB
2967 /* Ignore the section header's string table. */
2968 && i != ehdr->e_shstrndx
2969 /* Ignore string tables named .stabstr, as they contain
2971 && 0 != memcmp(".stabstr", sh_strtab + shdr[i].sh_name, 8)
2973 IF_DEBUG(linker,debugBelch(" section %d is a normal string table", i ));
2974 strtab = ehdrC + shdr[i].sh_offset;
2979 errorBelch("%s: no string tables, or too many", oc->fileName);
2984 IF_DEBUG(linker,debugBelch( "\nSymbol tables" ));
2985 for (i = 0; i < ehdr->e_shnum; i++) {
2986 if (shdr[i].sh_type != SHT_SYMTAB) continue;
2987 IF_DEBUG(linker,debugBelch( "section %d is a symbol table\n", i ));
2989 stab = (Elf_Sym*) (ehdrC + shdr[i].sh_offset);
2990 nent = shdr[i].sh_size / sizeof(Elf_Sym);
2991 IF_DEBUG(linker,debugBelch( " number of entries is apparently %d (%ld rem)\n",
2993 (long)shdr[i].sh_size % sizeof(Elf_Sym)
2995 if (0 != shdr[i].sh_size % sizeof(Elf_Sym)) {
2996 errorBelch("%s: non-integral number of symbol table entries", oc->fileName);
2999 for (j = 0; j < nent; j++) {
3000 IF_DEBUG(linker,debugBelch(" %2d ", j ));
3001 IF_DEBUG(linker,debugBelch(" sec=%-5d size=%-3d val=%5p ",
3002 (int)stab[j].st_shndx,
3003 (int)stab[j].st_size,
3004 (char*)stab[j].st_value ));
3006 IF_DEBUG(linker,debugBelch("type=" ));
3007 switch (ELF_ST_TYPE(stab[j].st_info)) {
3008 case STT_NOTYPE: IF_DEBUG(linker,debugBelch("notype " )); break;
3009 case STT_OBJECT: IF_DEBUG(linker,debugBelch("object " )); break;
3010 case STT_FUNC : IF_DEBUG(linker,debugBelch("func " )); break;
3011 case STT_SECTION: IF_DEBUG(linker,debugBelch("section" )); break;
3012 case STT_FILE: IF_DEBUG(linker,debugBelch("file " )); break;
3013 default: IF_DEBUG(linker,debugBelch("? " )); break;
3015 IF_DEBUG(linker,debugBelch(" " ));
3017 IF_DEBUG(linker,debugBelch("bind=" ));
3018 switch (ELF_ST_BIND(stab[j].st_info)) {
3019 case STB_LOCAL : IF_DEBUG(linker,debugBelch("local " )); break;
3020 case STB_GLOBAL: IF_DEBUG(linker,debugBelch("global" )); break;
3021 case STB_WEAK : IF_DEBUG(linker,debugBelch("weak " )); break;
3022 default: IF_DEBUG(linker,debugBelch("? " )); break;
3024 IF_DEBUG(linker,debugBelch(" " ));
3026 IF_DEBUG(linker,debugBelch("name=%s\n", strtab + stab[j].st_name ));
3030 if (nsymtabs == 0) {
3031 errorBelch("%s: didn't find any symbol tables", oc->fileName);
3038 static int getSectionKind_ELF( Elf_Shdr *hdr, int *is_bss )
3042 if (hdr->sh_type == SHT_PROGBITS
3043 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_EXECINSTR)) {
3044 /* .text-style section */
3045 return SECTIONKIND_CODE_OR_RODATA;
3048 if (hdr->sh_type == SHT_PROGBITS
3049 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_WRITE)) {
3050 /* .data-style section */
3051 return SECTIONKIND_RWDATA;
3054 if (hdr->sh_type == SHT_PROGBITS
3055 && (hdr->sh_flags & SHF_ALLOC) && !(hdr->sh_flags & SHF_WRITE)) {
3056 /* .rodata-style section */
3057 return SECTIONKIND_CODE_OR_RODATA;
3060 if (hdr->sh_type == SHT_NOBITS
3061 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_WRITE)) {
3062 /* .bss-style section */
3064 return SECTIONKIND_RWDATA;
3067 return SECTIONKIND_OTHER;
3072 ocGetNames_ELF ( ObjectCode* oc )
3077 char* ehdrC = (char*)(oc->image);
3078 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
3079 char* strtab = findElfSection ( ehdrC, SHT_STRTAB );
3080 Elf_Shdr* shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
3082 ASSERT(symhash != NULL);
3085 errorBelch("%s: no strtab", oc->fileName);
3090 for (i = 0; i < ehdr->e_shnum; i++) {
3091 /* Figure out what kind of section it is. Logic derived from
3092 Figure 1.14 ("Special Sections") of the ELF document
3093 ("Portable Formats Specification, Version 1.1"). */
3095 SectionKind kind = getSectionKind_ELF(&shdr[i], &is_bss);
3097 if (is_bss && shdr[i].sh_size > 0) {
3098 /* This is a non-empty .bss section. Allocate zeroed space for
3099 it, and set its .sh_offset field such that
3100 ehdrC + .sh_offset == addr_of_zeroed_space. */
3101 char* zspace = stgCallocBytes(1, shdr[i].sh_size,
3102 "ocGetNames_ELF(BSS)");
3103 shdr[i].sh_offset = ((char*)zspace) - ((char*)ehdrC);
3105 debugBelch("BSS section at 0x%x, size %d\n",
3106 zspace, shdr[i].sh_size);
3110 /* fill in the section info */
3111 if (kind != SECTIONKIND_OTHER && shdr[i].sh_size > 0) {
3112 addProddableBlock(oc, ehdrC + shdr[i].sh_offset, shdr[i].sh_size);
3113 addSection(oc, kind, ehdrC + shdr[i].sh_offset,
3114 ehdrC + shdr[i].sh_offset + shdr[i].sh_size - 1);
3117 if (shdr[i].sh_type != SHT_SYMTAB) continue;
3119 /* copy stuff into this module's object symbol table */
3120 stab = (Elf_Sym*) (ehdrC + shdr[i].sh_offset);
3121 nent = shdr[i].sh_size / sizeof(Elf_Sym);
3123 oc->n_symbols = nent;
3124 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
3125 "ocGetNames_ELF(oc->symbols)");
3127 for (j = 0; j < nent; j++) {
3129 char isLocal = FALSE; /* avoids uninit-var warning */
3131 char* nm = strtab + stab[j].st_name;
3132 int secno = stab[j].st_shndx;
3134 /* Figure out if we want to add it; if so, set ad to its
3135 address. Otherwise leave ad == NULL. */
3137 if (secno == SHN_COMMON) {
3139 ad = stgCallocBytes(1, stab[j].st_size, "ocGetNames_ELF(COMMON)");
3141 debugBelch("COMMON symbol, size %d name %s\n",
3142 stab[j].st_size, nm);
3144 /* Pointless to do addProddableBlock() for this area,
3145 since the linker should never poke around in it. */
3148 if ( ( ELF_ST_BIND(stab[j].st_info)==STB_GLOBAL
3149 || ELF_ST_BIND(stab[j].st_info)==STB_LOCAL
3151 /* and not an undefined symbol */
3152 && stab[j].st_shndx != SHN_UNDEF
3153 /* and not in a "special section" */
3154 && stab[j].st_shndx < SHN_LORESERVE
3156 /* and it's a not a section or string table or anything silly */
3157 ( ELF_ST_TYPE(stab[j].st_info)==STT_FUNC ||
3158 ELF_ST_TYPE(stab[j].st_info)==STT_OBJECT ||
3159 ELF_ST_TYPE(stab[j].st_info)==STT_NOTYPE
3162 /* Section 0 is the undefined section, hence > and not >=. */
3163 ASSERT(secno > 0 && secno < ehdr->e_shnum);
3165 if (shdr[secno].sh_type == SHT_NOBITS) {
3166 debugBelch(" BSS symbol, size %d off %d name %s\n",
3167 stab[j].st_size, stab[j].st_value, nm);
3170 ad = ehdrC + shdr[ secno ].sh_offset + stab[j].st_value;
3171 if (ELF_ST_BIND(stab[j].st_info)==STB_LOCAL) {
3174 #ifdef ELF_FUNCTION_DESC
3175 /* dlsym() and the initialisation table both give us function
3176 * descriptors, so to be consistent we store function descriptors
3177 * in the symbol table */
3178 if (ELF_ST_TYPE(stab[j].st_info) == STT_FUNC)
3179 ad = (char *)allocateFunctionDesc((Elf_Addr)ad);
3181 IF_DEBUG(linker,debugBelch( "addOTabName(GLOB): %10p %s %s",
3182 ad, oc->fileName, nm ));
3187 /* And the decision is ... */
3191 oc->symbols[j] = nm;
3194 /* Ignore entirely. */
3196 ghciInsertStrHashTable(oc->fileName, symhash, nm, ad);
3200 IF_DEBUG(linker,debugBelch( "skipping `%s'\n",
3201 strtab + stab[j].st_name ));
3204 "skipping bind = %d, type = %d, shndx = %d `%s'\n",
3205 (int)ELF_ST_BIND(stab[j].st_info),
3206 (int)ELF_ST_TYPE(stab[j].st_info),
3207 (int)stab[j].st_shndx,
3208 strtab + stab[j].st_name
3211 oc->symbols[j] = NULL;
3220 /* Do ELF relocations which lack an explicit addend. All x86-linux
3221 relocations appear to be of this form. */
3223 do_Elf_Rel_relocations ( ObjectCode* oc, char* ehdrC,
3224 Elf_Shdr* shdr, int shnum,
3225 Elf_Sym* stab, char* strtab )
3230 Elf_Rel* rtab = (Elf_Rel*) (ehdrC + shdr[shnum].sh_offset);
3231 int nent = shdr[shnum].sh_size / sizeof(Elf_Rel);
3232 int target_shndx = shdr[shnum].sh_info;
3233 int symtab_shndx = shdr[shnum].sh_link;
3235 stab = (Elf_Sym*) (ehdrC + shdr[ symtab_shndx ].sh_offset);
3236 targ = (Elf_Word*)(ehdrC + shdr[ target_shndx ].sh_offset);
3237 IF_DEBUG(linker,debugBelch( "relocations for section %d using symtab %d\n",
3238 target_shndx, symtab_shndx ));
3240 /* Skip sections that we're not interested in. */
3243 SectionKind kind = getSectionKind_ELF(&shdr[target_shndx], &is_bss);
3244 if (kind == SECTIONKIND_OTHER) {
3245 IF_DEBUG(linker,debugBelch( "skipping (target section not loaded)"));
3250 for (j = 0; j < nent; j++) {
3251 Elf_Addr offset = rtab[j].r_offset;
3252 Elf_Addr info = rtab[j].r_info;
3254 Elf_Addr P = ((Elf_Addr)targ) + offset;
3255 Elf_Word* pP = (Elf_Word*)P;
3260 StgStablePtr stablePtr;
3263 IF_DEBUG(linker,debugBelch( "Rel entry %3d is raw(%6p %6p)",
3264 j, (void*)offset, (void*)info ));
3266 IF_DEBUG(linker,debugBelch( " ZERO" ));
3269 Elf_Sym sym = stab[ELF_R_SYM(info)];
3270 /* First see if it is a local symbol. */
3271 if (ELF_ST_BIND(sym.st_info) == STB_LOCAL) {
3272 /* Yes, so we can get the address directly from the ELF symbol
3274 symbol = sym.st_name==0 ? "(noname)" : strtab+sym.st_name;
3276 (ehdrC + shdr[ sym.st_shndx ].sh_offset
3277 + stab[ELF_R_SYM(info)].st_value);
3280 symbol = strtab + sym.st_name;
3281 stablePtr = (StgStablePtr)lookupHashTable(stablehash, (StgWord)symbol);
3282 if (NULL == stablePtr) {
3283 /* No, so look up the name in our global table. */
3284 S_tmp = lookupSymbol( symbol );
3285 S = (Elf_Addr)S_tmp;
3287 stableVal = deRefStablePtr( stablePtr );
3288 addRootObject((void*)P);
3290 S = (Elf_Addr)S_tmp;
3294 errorBelch("%s: unknown symbol `%s'", oc->fileName, symbol);
3297 IF_DEBUG(linker,debugBelch( "`%s' resolves to %p\n", symbol, (void*)S ));
3300 IF_DEBUG(linker,debugBelch( "Reloc: P = %p S = %p A = %p\n",
3301 (void*)P, (void*)S, (void*)A ));
3302 checkProddableBlock ( oc, pP );
3306 switch (ELF_R_TYPE(info)) {
3307 # ifdef i386_HOST_ARCH
3308 case R_386_32: *pP = value; break;
3309 case R_386_PC32: *pP = value - P; break;
3312 errorBelch("%s: unhandled ELF relocation(Rel) type %lu\n",
3313 oc->fileName, (lnat)ELF_R_TYPE(info));
3321 /* Do ELF relocations for which explicit addends are supplied.
3322 sparc-solaris relocations appear to be of this form. */
3324 do_Elf_Rela_relocations ( ObjectCode* oc, char* ehdrC,
3325 Elf_Shdr* shdr, int shnum,
3326 Elf_Sym* stab, char* strtab )
3329 char *symbol = NULL;
3331 Elf_Rela* rtab = (Elf_Rela*) (ehdrC + shdr[shnum].sh_offset);
3332 int nent = shdr[shnum].sh_size / sizeof(Elf_Rela);
3333 int target_shndx = shdr[shnum].sh_info;
3334 int symtab_shndx = shdr[shnum].sh_link;
3336 stab = (Elf_Sym*) (ehdrC + shdr[ symtab_shndx ].sh_offset);
3337 targ = (Elf_Addr) (ehdrC + shdr[ target_shndx ].sh_offset);
3338 IF_DEBUG(linker,debugBelch( "relocations for section %d using symtab %d\n",
3339 target_shndx, symtab_shndx ));
3341 for (j = 0; j < nent; j++) {
3342 #if defined(DEBUG) || defined(sparc_HOST_ARCH) || defined(ia64_HOST_ARCH) || defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH)
3343 /* This #ifdef only serves to avoid unused-var warnings. */
3344 Elf_Addr offset = rtab[j].r_offset;
3345 Elf_Addr P = targ + offset;
3347 Elf_Addr info = rtab[j].r_info;
3348 Elf_Addr A = rtab[j].r_addend;
3352 # if defined(sparc_HOST_ARCH)
3353 Elf_Word* pP = (Elf_Word*)P;
3355 # elif defined(ia64_HOST_ARCH)
3356 Elf64_Xword *pP = (Elf64_Xword *)P;
3358 # elif defined(powerpc_HOST_ARCH)
3362 IF_DEBUG(linker,debugBelch( "Rel entry %3d is raw(%6p %6p %6p) ",
3363 j, (void*)offset, (void*)info,
3366 IF_DEBUG(linker,debugBelch( " ZERO" ));
3369 Elf_Sym sym = stab[ELF_R_SYM(info)];
3370 /* First see if it is a local symbol. */
3371 if (ELF_ST_BIND(sym.st_info) == STB_LOCAL) {
3372 /* Yes, so we can get the address directly from the ELF symbol
3374 symbol = sym.st_name==0 ? "(noname)" : strtab+sym.st_name;
3376 (ehdrC + shdr[ sym.st_shndx ].sh_offset
3377 + stab[ELF_R_SYM(info)].st_value);
3378 #ifdef ELF_FUNCTION_DESC
3379 /* Make a function descriptor for this function */
3380 if (S && ELF_ST_TYPE(sym.st_info) == STT_FUNC) {
3381 S = allocateFunctionDesc(S + A);
3386 /* No, so look up the name in our global table. */
3387 symbol = strtab + sym.st_name;
3388 S_tmp = lookupSymbol( symbol );
3389 S = (Elf_Addr)S_tmp;
3391 #ifdef ELF_FUNCTION_DESC
3392 /* If a function, already a function descriptor - we would
3393 have to copy it to add an offset. */
3394 if (S && (ELF_ST_TYPE(sym.st_info) == STT_FUNC) && (A != 0))
3395 errorBelch("%s: function %s with addend %p", oc->fileName, symbol, (void *)A);
3399 errorBelch("%s: unknown symbol `%s'", oc->fileName, symbol);
3402 IF_DEBUG(linker,debugBelch( "`%s' resolves to %p", symbol, (void*)S ));
3405 IF_DEBUG(linker,debugBelch("Reloc: P = %p S = %p A = %p\n",
3406 (void*)P, (void*)S, (void*)A ));
3407 /* checkProddableBlock ( oc, (void*)P ); */
3411 switch (ELF_R_TYPE(info)) {
3412 # if defined(sparc_HOST_ARCH)
3413 case R_SPARC_WDISP30:
3414 w1 = *pP & 0xC0000000;
3415 w2 = (Elf_Word)((value - P) >> 2);
3416 ASSERT((w2 & 0xC0000000) == 0);
3421 w1 = *pP & 0xFFC00000;
3422 w2 = (Elf_Word)(value >> 10);
3423 ASSERT((w2 & 0xFFC00000) == 0);
3429 w2 = (Elf_Word)(value & 0x3FF);
3430 ASSERT((w2 & ~0x3FF) == 0);
3434 /* According to the Sun documentation:
3436 This relocation type resembles R_SPARC_32, except it refers to an
3437 unaligned word. That is, the word to be relocated must be treated
3438 as four separate bytes with arbitrary alignment, not as a word
3439 aligned according to the architecture requirements.
3441 (JRS: which means that freeloading on the R_SPARC_32 case
3442 is probably wrong, but hey ...)
3446 w2 = (Elf_Word)value;
3449 # elif defined(ia64_HOST_ARCH)
3450 case R_IA64_DIR64LSB:
3451 case R_IA64_FPTR64LSB:
3454 case R_IA64_PCREL64LSB:
3457 case R_IA64_SEGREL64LSB:
3458 addr = findElfSegment(ehdrC, value);
3461 case R_IA64_GPREL22:
3462 ia64_reloc_gprel22(P, value);
3464 case R_IA64_LTOFF22:
3465 case R_IA64_LTOFF22X:
3466 case R_IA64_LTOFF_FPTR22:
3467 addr = allocateGOTEntry(value);
3468 ia64_reloc_gprel22(P, addr);
3470 case R_IA64_PCREL21B:
3471 ia64_reloc_pcrel21(P, S, oc);
3474 /* This goes with R_IA64_LTOFF22X and points to the load to
3475 * convert into a move. We don't implement relaxation. */
3477 # elif defined(powerpc_HOST_ARCH)
3478 case R_PPC_ADDR16_LO:
3479 *(Elf32_Half*) P = value;
3482 case R_PPC_ADDR16_HI:
3483 *(Elf32_Half*) P = value >> 16;
3486 case R_PPC_ADDR16_HA:
3487 *(Elf32_Half*) P = (value + 0x8000) >> 16;
3491 *(Elf32_Word *) P = value;
3495 *(Elf32_Word *) P = value - P;
3501 if( delta << 6 >> 6 != delta )
3503 value = makeJumpIsland( oc, ELF_R_SYM(info), value );
3506 if( value == 0 || delta << 6 >> 6 != delta )
3508 barf( "Unable to make ppcJumpIsland for #%d",
3514 *(Elf_Word *) P = (*(Elf_Word *) P & 0xfc000003)
3515 | (delta & 0x3fffffc);
3519 #if x86_64_HOST_ARCH
3521 *(Elf64_Xword *)P = value;
3526 StgInt64 off = value - P;
3527 if (off >= 0x7fffffffL || off < -0x80000000L) {
3528 barf("R_X86_64_PC32 relocation out of range: %s = %p",
3531 *(Elf64_Word *)P = (Elf64_Word)off;
3536 if (value >= 0x7fffffffL) {
3537 barf("R_X86_64_32 relocation out of range: %s = %p\n",
3540 *(Elf64_Word *)P = (Elf64_Word)value;
3544 if ((StgInt64)value > 0x7fffffffL || (StgInt64)value < -0x80000000L) {
3545 barf("R_X86_64_32S relocation out of range: %s = %p\n",
3548 *(Elf64_Sword *)P = (Elf64_Sword)value;
3553 errorBelch("%s: unhandled ELF relocation(RelA) type %lu\n",
3554 oc->fileName, (lnat)ELF_R_TYPE(info));
3563 ocResolve_ELF ( ObjectCode* oc )
3567 Elf_Sym* stab = NULL;
3568 char* ehdrC = (char*)(oc->image);
3569 Elf_Ehdr* ehdr = (Elf_Ehdr*) ehdrC;
3570 Elf_Shdr* shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
3572 /* first find "the" symbol table */
3573 stab = (Elf_Sym*) findElfSection ( ehdrC, SHT_SYMTAB );
3575 /* also go find the string table */
3576 strtab = findElfSection ( ehdrC, SHT_STRTAB );
3578 if (stab == NULL || strtab == NULL) {
3579 errorBelch("%s: can't find string or symbol table", oc->fileName);
3583 /* Process the relocation sections. */
3584 for (shnum = 0; shnum < ehdr->e_shnum; shnum++) {
3585 if (shdr[shnum].sh_type == SHT_REL) {
3586 ok = do_Elf_Rel_relocations ( oc, ehdrC, shdr,
3587 shnum, stab, strtab );
3591 if (shdr[shnum].sh_type == SHT_RELA) {
3592 ok = do_Elf_Rela_relocations ( oc, ehdrC, shdr,
3593 shnum, stab, strtab );
3598 /* Free the local symbol table; we won't need it again. */
3599 freeHashTable(oc->lochash, NULL);
3602 #if defined(powerpc_HOST_ARCH)
3603 ocFlushInstructionCache( oc );
3611 * Instructions are 41 bits long, packed into 128 bit bundles with a 5-bit template
3612 * at the front. The following utility functions pack and unpack instructions, and
3613 * take care of the most common relocations.
3616 #ifdef ia64_HOST_ARCH
3619 ia64_extract_instruction(Elf64_Xword *target)
3622 int slot = (Elf_Addr)target & 3;
3623 target = (Elf_Addr)target & ~3;
3631 return ((w1 >> 5) & 0x1ffffffffff);
3633 return (w1 >> 46) | ((w2 & 0x7fffff) << 18);
3637 barf("ia64_extract_instruction: invalid slot %p", target);
3642 ia64_deposit_instruction(Elf64_Xword *target, Elf64_Xword value)
3644 int slot = (Elf_Addr)target & 3;
3645 target = (Elf_Addr)target & ~3;
3650 *target |= value << 5;
3653 *target |= value << 46;
3654 *(target+1) |= value >> 18;
3657 *(target+1) |= value << 23;
3663 ia64_reloc_gprel22(Elf_Addr target, Elf_Addr value)
3665 Elf64_Xword instruction;
3666 Elf64_Sxword rel_value;
3668 rel_value = value - gp_val;
3669 if ((rel_value > 0x1fffff) || (rel_value < -0x1fffff))
3670 barf("GP-relative data out of range (address = 0x%lx, gp = 0x%lx)", value, gp_val);
3672 instruction = ia64_extract_instruction((Elf64_Xword *)target);
3673 instruction |= (((rel_value >> 0) & 0x07f) << 13) /* imm7b */
3674 | (((rel_value >> 7) & 0x1ff) << 27) /* imm9d */
3675 | (((rel_value >> 16) & 0x01f) << 22) /* imm5c */
3676 | ((Elf64_Xword)(rel_value < 0) << 36); /* s */
3677 ia64_deposit_instruction((Elf64_Xword *)target, instruction);
3681 ia64_reloc_pcrel21(Elf_Addr target, Elf_Addr value, ObjectCode *oc)
3683 Elf64_Xword instruction;
3684 Elf64_Sxword rel_value;
3687 entry = allocatePLTEntry(value, oc);
3689 rel_value = (entry >> 4) - (target >> 4);
3690 if ((rel_value > 0xfffff) || (rel_value < -0xfffff))
3691 barf("PLT entry too far away (entry = 0x%lx, target = 0x%lx)", entry, target);
3693 instruction = ia64_extract_instruction((Elf64_Xword *)target);
3694 instruction |= ((rel_value & 0xfffff) << 13) /* imm20b */
3695 | ((Elf64_Xword)(rel_value < 0) << 36); /* s */
3696 ia64_deposit_instruction((Elf64_Xword *)target, instruction);
3702 * PowerPC ELF specifics
3705 #ifdef powerpc_HOST_ARCH
3707 static int ocAllocateJumpIslands_ELF( ObjectCode *oc )
3713 ehdr = (Elf_Ehdr *) oc->image;
3714 shdr = (Elf_Shdr *) ( ((char *)oc->image) + ehdr->e_shoff );
3716 for( i = 0; i < ehdr->e_shnum; i++ )
3717 if( shdr[i].sh_type == SHT_SYMTAB )
3720 if( i == ehdr->e_shnum )
3722 errorBelch( "This ELF file contains no symtab" );
3726 if( shdr[i].sh_entsize != sizeof( Elf_Sym ) )
3728 errorBelch( "The entry size (%d) of the symtab isn't %d\n",
3729 shdr[i].sh_entsize, sizeof( Elf_Sym ) );
3734 return ocAllocateJumpIslands( oc, shdr[i].sh_size / sizeof( Elf_Sym ), 0 );
3737 #endif /* powerpc */
3741 /* --------------------------------------------------------------------------
3743 * ------------------------------------------------------------------------*/
3745 #if defined(OBJFORMAT_MACHO)
3748 Support for MachO linking on Darwin/MacOS X
3749 by Wolfgang Thaller (wolfgang.thaller@gmx.net)
3751 I hereby formally apologize for the hackish nature of this code.
3752 Things that need to be done:
3753 *) implement ocVerifyImage_MachO
3754 *) add still more sanity checks.
3757 #ifdef powerpc_HOST_ARCH
3758 static int ocAllocateJumpIslands_MachO(ObjectCode* oc)
3760 struct mach_header *header = (struct mach_header *) oc->image;
3761 struct load_command *lc = (struct load_command *) (header + 1);
3764 for( i = 0; i < header->ncmds; i++ )
3766 if( lc->cmd == LC_SYMTAB )
3768 // Find out the first and last undefined external
3769 // symbol, so we don't have to allocate too many
3771 struct symtab_command *symLC = (struct symtab_command *) lc;
3772 unsigned min = symLC->nsyms, max = 0;
3773 struct nlist *nlist =
3774 symLC ? (struct nlist*) ((char*) oc->image + symLC->symoff)
3776 for(i=0;i<symLC->nsyms;i++)
3778 if(nlist[i].n_type & N_STAB)
3780 else if(nlist[i].n_type & N_EXT)
3782 if((nlist[i].n_type & N_TYPE) == N_UNDF
3783 && (nlist[i].n_value == 0))
3793 return ocAllocateJumpIslands(oc, max - min + 1, min);
3798 lc = (struct load_command *) ( ((char *)lc) + lc->cmdsize );
3800 return ocAllocateJumpIslands(oc,0,0);
3804 static int ocVerifyImage_MachO(ObjectCode* oc STG_UNUSED)
3806 // FIXME: do some verifying here
3810 static int resolveImports(
3813 struct symtab_command *symLC,
3814 struct section *sect, // ptr to lazy or non-lazy symbol pointer section
3815 unsigned long *indirectSyms,
3816 struct nlist *nlist)
3819 size_t itemSize = 4;
3822 int isJumpTable = 0;
3823 if(!strcmp(sect->sectname,"__jump_table"))
3827 ASSERT(sect->reserved2 == itemSize);
3831 for(i=0; i*itemSize < sect->size;i++)
3833 // according to otool, reserved1 contains the first index into the indirect symbol table
3834 struct nlist *symbol = &nlist[indirectSyms[sect->reserved1+i]];
3835 char *nm = image + symLC->stroff + symbol->n_un.n_strx;
3838 if((symbol->n_type & N_TYPE) == N_UNDF
3839 && (symbol->n_type & N_EXT) && (symbol->n_value != 0))
3840 addr = (void*) (symbol->n_value);
3841 else if((addr = lookupLocalSymbol(oc,nm)) != NULL)
3844 addr = lookupSymbol(nm);
3847 errorBelch("\n%s: unknown symbol `%s'", oc->fileName, nm);
3855 checkProddableBlock(oc,image + sect->offset + i*itemSize);
3856 *(image + sect->offset + i*itemSize) = 0xe9; // jmp
3857 *(unsigned*)(image + sect->offset + i*itemSize + 1)
3858 = (char*)addr - (image + sect->offset + i*itemSize + 5);
3863 checkProddableBlock(oc,((void**)(image + sect->offset)) + i);
3864 ((void**)(image + sect->offset))[i] = addr;
3871 static unsigned long relocateAddress(
3874 struct section* sections,
3875 unsigned long address)
3878 for(i = 0; i < nSections; i++)
3880 if(sections[i].addr <= address
3881 && address < sections[i].addr + sections[i].size)
3883 return (unsigned long)oc->image
3884 + sections[i].offset + address - sections[i].addr;
3887 barf("Invalid Mach-O file:"
3888 "Address out of bounds while relocating object file");
3892 static int relocateSection(
3895 struct symtab_command *symLC, struct nlist *nlist,
3896 int nSections, struct section* sections, struct section *sect)
3898 struct relocation_info *relocs;
3901 if(!strcmp(sect->sectname,"__la_symbol_ptr"))
3903 else if(!strcmp(sect->sectname,"__nl_symbol_ptr"))
3905 else if(!strcmp(sect->sectname,"__la_sym_ptr2"))
3907 else if(!strcmp(sect->sectname,"__la_sym_ptr3"))
3911 relocs = (struct relocation_info*) (image + sect->reloff);
3915 if(relocs[i].r_address & R_SCATTERED)
3917 struct scattered_relocation_info *scat =
3918 (struct scattered_relocation_info*) &relocs[i];
3922 if(scat->r_length == 2)
3924 unsigned long word = 0;
3925 unsigned long* wordPtr = (unsigned long*) (image + sect->offset + scat->r_address);
3926 checkProddableBlock(oc,wordPtr);
3928 // Note on relocation types:
3929 // i386 uses the GENERIC_RELOC_* types,
3930 // while ppc uses special PPC_RELOC_* types.
3931 // *_RELOC_VANILLA and *_RELOC_PAIR have the same value
3932 // in both cases, all others are different.
3933 // Therefore, we use GENERIC_RELOC_VANILLA
3934 // and GENERIC_RELOC_PAIR instead of the PPC variants,
3935 // and use #ifdefs for the other types.
3937 // Step 1: Figure out what the relocated value should be
3938 if(scat->r_type == GENERIC_RELOC_VANILLA)
3940 word = *wordPtr + (unsigned long) relocateAddress(
3947 #ifdef powerpc_HOST_ARCH
3948 else if(scat->r_type == PPC_RELOC_SECTDIFF
3949 || scat->r_type == PPC_RELOC_LO16_SECTDIFF
3950 || scat->r_type == PPC_RELOC_HI16_SECTDIFF
3951 || scat->r_type == PPC_RELOC_HA16_SECTDIFF)
3953 else if(scat->r_type == GENERIC_RELOC_SECTDIFF)
3956 struct scattered_relocation_info *pair =
3957 (struct scattered_relocation_info*) &relocs[i+1];
3959 if(!pair->r_scattered || pair->r_type != GENERIC_RELOC_PAIR)
3960 barf("Invalid Mach-O file: "
3961 "RELOC_*_SECTDIFF not followed by RELOC_PAIR");
3963 word = (unsigned long)
3964 (relocateAddress(oc, nSections, sections, scat->r_value)
3965 - relocateAddress(oc, nSections, sections, pair->r_value));
3968 #ifdef powerpc_HOST_ARCH
3969 else if(scat->r_type == PPC_RELOC_HI16
3970 || scat->r_type == PPC_RELOC_LO16
3971 || scat->r_type == PPC_RELOC_HA16
3972 || scat->r_type == PPC_RELOC_LO14)
3973 { // these are generated by label+offset things
3974 struct relocation_info *pair = &relocs[i+1];
3975 if((pair->r_address & R_SCATTERED) || pair->r_type != PPC_RELOC_PAIR)
3976 barf("Invalid Mach-O file: "
3977 "PPC_RELOC_* not followed by PPC_RELOC_PAIR");
3979 if(scat->r_type == PPC_RELOC_LO16)
3981 word = ((unsigned short*) wordPtr)[1];
3982 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
3984 else if(scat->r_type == PPC_RELOC_LO14)
3986 barf("Unsupported Relocation: PPC_RELOC_LO14");
3987 word = ((unsigned short*) wordPtr)[1] & 0xFFFC;
3988 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
3990 else if(scat->r_type == PPC_RELOC_HI16)
3992 word = ((unsigned short*) wordPtr)[1] << 16;
3993 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF);
3995 else if(scat->r_type == PPC_RELOC_HA16)
3997 word = ((unsigned short*) wordPtr)[1] << 16;
3998 word += ((short)relocs[i+1].r_address & (short)0xFFFF);
4002 word += (unsigned long) relocateAddress(oc, nSections, sections, scat->r_value)
4009 continue; // ignore the others
4011 #ifdef powerpc_HOST_ARCH
4012 if(scat->r_type == GENERIC_RELOC_VANILLA
4013 || scat->r_type == PPC_RELOC_SECTDIFF)
4015 if(scat->r_type == GENERIC_RELOC_VANILLA
4016 || scat->r_type == GENERIC_RELOC_SECTDIFF)
4021 #ifdef powerpc_HOST_ARCH
4022 else if(scat->r_type == PPC_RELOC_LO16_SECTDIFF || scat->r_type == PPC_RELOC_LO16)
4024 ((unsigned short*) wordPtr)[1] = word & 0xFFFF;
4026 else if(scat->r_type == PPC_RELOC_HI16_SECTDIFF || scat->r_type == PPC_RELOC_HI16)
4028 ((unsigned short*) wordPtr)[1] = (word >> 16) & 0xFFFF;
4030 else if(scat->r_type == PPC_RELOC_HA16_SECTDIFF || scat->r_type == PPC_RELOC_HA16)
4032 ((unsigned short*) wordPtr)[1] = ((word >> 16) & 0xFFFF)
4033 + ((word & (1<<15)) ? 1 : 0);
4039 continue; // FIXME: I hope it's OK to ignore all the others.
4043 struct relocation_info *reloc = &relocs[i];
4044 if(reloc->r_pcrel && !reloc->r_extern)
4047 if(reloc->r_length == 2)
4049 unsigned long word = 0;
4050 #ifdef powerpc_HOST_ARCH
4051 unsigned long jumpIsland = 0;
4052 long offsetToJumpIsland = 0xBADBAD42; // initialise to bad value
4053 // to avoid warning and to catch
4057 unsigned long* wordPtr = (unsigned long*) (image + sect->offset + reloc->r_address);
4058 checkProddableBlock(oc,wordPtr);
4060 if(reloc->r_type == GENERIC_RELOC_VANILLA)
4064 #ifdef powerpc_HOST_ARCH
4065 else if(reloc->r_type == PPC_RELOC_LO16)
4067 word = ((unsigned short*) wordPtr)[1];
4068 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
4070 else if(reloc->r_type == PPC_RELOC_HI16)
4072 word = ((unsigned short*) wordPtr)[1] << 16;
4073 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF);
4075 else if(reloc->r_type == PPC_RELOC_HA16)
4077 word = ((unsigned short*) wordPtr)[1] << 16;
4078 word += ((short)relocs[i+1].r_address & (short)0xFFFF);
4080 else if(reloc->r_type == PPC_RELOC_BR24)
4083 word = (word & 0x03FFFFFC) | ((word & 0x02000000) ? 0xFC000000 : 0);
4087 if(!reloc->r_extern)
4090 sections[reloc->r_symbolnum-1].offset
4091 - sections[reloc->r_symbolnum-1].addr
4098 struct nlist *symbol = &nlist[reloc->r_symbolnum];
4099 char *nm = image + symLC->stroff + symbol->n_un.n_strx;
4100 void *symbolAddress = lookupSymbol(nm);
4103 errorBelch("\nunknown symbol `%s'", nm);
4109 #ifdef powerpc_HOST_ARCH
4110 // In the .o file, this should be a relative jump to NULL
4111 // and we'll change it to a relative jump to the symbol
4112 ASSERT(-word == reloc->r_address);
4113 jumpIsland = makeJumpIsland(oc,reloc->r_symbolnum,(unsigned long) symbolAddress);
4116 offsetToJumpIsland = word + jumpIsland
4117 - (((long)image) + sect->offset - sect->addr);
4120 word += (unsigned long) symbolAddress
4121 - (((long)image) + sect->offset - sect->addr);
4125 word += (unsigned long) symbolAddress;
4129 if(reloc->r_type == GENERIC_RELOC_VANILLA)
4134 #ifdef powerpc_HOST_ARCH
4135 else if(reloc->r_type == PPC_RELOC_LO16)
4137 ((unsigned short*) wordPtr)[1] = word & 0xFFFF;
4140 else if(reloc->r_type == PPC_RELOC_HI16)
4142 ((unsigned short*) wordPtr)[1] = (word >> 16) & 0xFFFF;
4145 else if(reloc->r_type == PPC_RELOC_HA16)
4147 ((unsigned short*) wordPtr)[1] = ((word >> 16) & 0xFFFF)
4148 + ((word & (1<<15)) ? 1 : 0);
4151 else if(reloc->r_type == PPC_RELOC_BR24)
4153 if((long)word > (long)0x01FFFFFF || (long)word < (long)0xFFE00000)
4155 // The branch offset is too large.
4156 // Therefore, we try to use a jump island.
4159 barf("unconditional relative branch out of range: "
4160 "no jump island available");
4163 word = offsetToJumpIsland;
4164 if((long)word > (long)0x01FFFFFF || (long)word < (long)0xFFE00000)
4165 barf("unconditional relative branch out of range: "
4166 "jump island out of range");
4168 *wordPtr = (*wordPtr & 0xFC000003) | (word & 0x03FFFFFC);
4173 barf("\nunknown relocation %d",reloc->r_type);
4180 static int ocGetNames_MachO(ObjectCode* oc)
4182 char *image = (char*) oc->image;
4183 struct mach_header *header = (struct mach_header*) image;
4184 struct load_command *lc = (struct load_command*) (image + sizeof(struct mach_header));
4185 unsigned i,curSymbol = 0;
4186 struct segment_command *segLC = NULL;
4187 struct section *sections;
4188 struct symtab_command *symLC = NULL;
4189 struct nlist *nlist;
4190 unsigned long commonSize = 0;
4191 char *commonStorage = NULL;
4192 unsigned long commonCounter;
4194 for(i=0;i<header->ncmds;i++)
4196 if(lc->cmd == LC_SEGMENT)
4197 segLC = (struct segment_command*) lc;
4198 else if(lc->cmd == LC_SYMTAB)
4199 symLC = (struct symtab_command*) lc;
4200 lc = (struct load_command *) ( ((char*)lc) + lc->cmdsize );
4203 sections = (struct section*) (segLC+1);
4204 nlist = symLC ? (struct nlist*) (image + symLC->symoff)
4207 for(i=0;i<segLC->nsects;i++)
4209 if(sections[i].size == 0)
4212 if((sections[i].flags & SECTION_TYPE) == S_ZEROFILL)
4214 char * zeroFillArea = stgCallocBytes(1,sections[i].size,
4215 "ocGetNames_MachO(common symbols)");
4216 sections[i].offset = zeroFillArea - image;
4219 if(!strcmp(sections[i].sectname,"__text"))
4220 addSection(oc, SECTIONKIND_CODE_OR_RODATA,
4221 (void*) (image + sections[i].offset),
4222 (void*) (image + sections[i].offset + sections[i].size));
4223 else if(!strcmp(sections[i].sectname,"__const"))
4224 addSection(oc, SECTIONKIND_RWDATA,
4225 (void*) (image + sections[i].offset),
4226 (void*) (image + sections[i].offset + sections[i].size));
4227 else if(!strcmp(sections[i].sectname,"__data"))
4228 addSection(oc, SECTIONKIND_RWDATA,
4229 (void*) (image + sections[i].offset),
4230 (void*) (image + sections[i].offset + sections[i].size));
4231 else if(!strcmp(sections[i].sectname,"__bss")
4232 || !strcmp(sections[i].sectname,"__common"))
4233 addSection(oc, SECTIONKIND_RWDATA,
4234 (void*) (image + sections[i].offset),
4235 (void*) (image + sections[i].offset + sections[i].size));
4237 addProddableBlock(oc, (void*) (image + sections[i].offset),
4241 // count external symbols defined here
4245 for(i=0;i<symLC->nsyms;i++)
4247 if(nlist[i].n_type & N_STAB)
4249 else if(nlist[i].n_type & N_EXT)
4251 if((nlist[i].n_type & N_TYPE) == N_UNDF
4252 && (nlist[i].n_value != 0))
4254 commonSize += nlist[i].n_value;
4257 else if((nlist[i].n_type & N_TYPE) == N_SECT)
4262 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
4263 "ocGetNames_MachO(oc->symbols)");
4267 for(i=0;i<symLC->nsyms;i++)
4269 if(nlist[i].n_type & N_STAB)
4271 else if((nlist[i].n_type & N_TYPE) == N_SECT)
4273 if(nlist[i].n_type & N_EXT)
4275 char *nm = image + symLC->stroff + nlist[i].n_un.n_strx;
4276 ghciInsertStrHashTable(oc->fileName, symhash, nm,
4278 + sections[nlist[i].n_sect-1].offset
4279 - sections[nlist[i].n_sect-1].addr
4280 + nlist[i].n_value);
4281 oc->symbols[curSymbol++] = nm;
4285 char *nm = image + symLC->stroff + nlist[i].n_un.n_strx;
4286 ghciInsertStrHashTable(oc->fileName, oc->lochash, nm,
4288 + sections[nlist[i].n_sect-1].offset
4289 - sections[nlist[i].n_sect-1].addr
4290 + nlist[i].n_value);
4296 commonStorage = stgCallocBytes(1,commonSize,"ocGetNames_MachO(common symbols)");
4297 commonCounter = (unsigned long)commonStorage;
4300 for(i=0;i<symLC->nsyms;i++)
4302 if((nlist[i].n_type & N_TYPE) == N_UNDF
4303 && (nlist[i].n_type & N_EXT) && (nlist[i].n_value != 0))
4305 char *nm = image + symLC->stroff + nlist[i].n_un.n_strx;
4306 unsigned long sz = nlist[i].n_value;
4308 nlist[i].n_value = commonCounter;
4310 ghciInsertStrHashTable(oc->fileName, symhash, nm,
4311 (void*)commonCounter);
4312 oc->symbols[curSymbol++] = nm;
4314 commonCounter += sz;
4321 static int ocResolve_MachO(ObjectCode* oc)
4323 char *image = (char*) oc->image;
4324 struct mach_header *header = (struct mach_header*) image;
4325 struct load_command *lc = (struct load_command*) (image + sizeof(struct mach_header));
4327 struct segment_command *segLC = NULL;
4328 struct section *sections;
4329 struct symtab_command *symLC = NULL;
4330 struct dysymtab_command *dsymLC = NULL;
4331 struct nlist *nlist;
4333 for(i=0;i<header->ncmds;i++)
4335 if(lc->cmd == LC_SEGMENT)
4336 segLC = (struct segment_command*) lc;
4337 else if(lc->cmd == LC_SYMTAB)
4338 symLC = (struct symtab_command*) lc;
4339 else if(lc->cmd == LC_DYSYMTAB)
4340 dsymLC = (struct dysymtab_command*) lc;
4341 lc = (struct load_command *) ( ((char*)lc) + lc->cmdsize );
4344 sections = (struct section*) (segLC+1);
4345 nlist = symLC ? (struct nlist*) (image + symLC->symoff)
4350 unsigned long *indirectSyms
4351 = (unsigned long*) (image + dsymLC->indirectsymoff);
4353 for(i=0;i<segLC->nsects;i++)
4355 if( !strcmp(sections[i].sectname,"__la_symbol_ptr")
4356 || !strcmp(sections[i].sectname,"__la_sym_ptr2")
4357 || !strcmp(sections[i].sectname,"__la_sym_ptr3"))
4359 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4362 else if(!strcmp(sections[i].sectname,"__nl_symbol_ptr")
4363 || !strcmp(sections[i].sectname,"__pointers"))
4365 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4368 else if(!strcmp(sections[i].sectname,"__jump_table"))
4370 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4376 for(i=0;i<segLC->nsects;i++)
4378 if(!relocateSection(oc,image,symLC,nlist,segLC->nsects,sections,§ions[i]))
4382 /* Free the local symbol table; we won't need it again. */
4383 freeHashTable(oc->lochash, NULL);
4386 #if defined (powerpc_HOST_ARCH)
4387 ocFlushInstructionCache( oc );
4393 #ifdef powerpc_HOST_ARCH
4395 * The Mach-O object format uses leading underscores. But not everywhere.
4396 * There is a small number of runtime support functions defined in
4397 * libcc_dynamic.a whose name does not have a leading underscore.
4398 * As a consequence, we can't get their address from C code.
4399 * We have to use inline assembler just to take the address of a function.
4403 static void machoInitSymbolsWithoutUnderscore()
4405 extern void* symbolsWithoutUnderscore[];
4406 void **p = symbolsWithoutUnderscore;
4407 __asm__ volatile(".globl _symbolsWithoutUnderscore\n.data\n_symbolsWithoutUnderscore:");
4411 __asm__ volatile(".long " # x);
4413 RTS_MACHO_NOUNDERLINE_SYMBOLS
4415 __asm__ volatile(".text");
4419 ghciInsertStrHashTable("(GHCi built-in symbols)", symhash, #x, *p++);
4421 RTS_MACHO_NOUNDERLINE_SYMBOLS
4428 * Figure out by how much to shift the entire Mach-O file in memory
4429 * when loading so that its single segment ends up 16-byte-aligned
4431 static int machoGetMisalignment( FILE * f )
4433 struct mach_header header;
4436 fread(&header, sizeof(header), 1, f);
4439 if(header.magic != MH_MAGIC)
4442 misalignment = (header.sizeofcmds + sizeof(header))
4445 return misalignment ? (16 - misalignment) : 0;