1 /* -----------------------------------------------------------------------------
3 * (c) The GHC Team, 2000-2004
7 * ---------------------------------------------------------------------------*/
10 #include "PosixSource.h"
13 /* Linux needs _GNU_SOURCE to get RTLD_DEFAULT from <dlfcn.h> and
14 MREMAP_MAYMOVE from <sys/mman.h>.
25 #include "LinkerInternals.h"
29 #include "RtsTypeable.h"
31 #ifdef HAVE_SYS_TYPES_H
32 #include <sys/types.h>
38 #ifdef HAVE_SYS_STAT_H
42 #if defined(HAVE_DLFCN_H)
46 #if defined(cygwin32_HOST_OS)
51 #ifdef HAVE_SYS_TIME_H
55 #include <sys/fcntl.h>
56 #include <sys/termios.h>
57 #include <sys/utime.h>
58 #include <sys/utsname.h>
62 #if defined(ia64_HOST_ARCH) || defined(openbsd_HOST_OS) || defined(linux_HOST_OS) || defined(freebsd_HOST_OS)
67 #if defined(openbsd_HOST_OS) || defined(linux_HOST_OS) || defined(freebsd_HOST_OS)
75 #if defined(linux_HOST_OS) || defined(solaris2_HOST_OS) || defined(freebsd_HOST_OS) || defined(netbsd_HOST_OS) || defined(openbsd_HOST_OS)
76 # define OBJFORMAT_ELF
77 #elif defined(cygwin32_HOST_OS) || defined (mingw32_HOST_OS)
78 # define OBJFORMAT_PEi386
81 #elif defined(darwin_HOST_OS)
82 # define OBJFORMAT_MACHO
83 # include <mach-o/loader.h>
84 # include <mach-o/nlist.h>
85 # include <mach-o/reloc.h>
86 # include <mach-o/dyld.h>
87 #if defined(powerpc_HOST_ARCH)
88 # include <mach-o/ppc/reloc.h>
92 /* Hash table mapping symbol names to Symbol */
93 static /*Str*/HashTable *symhash;
95 /* Hash table mapping symbol names to StgStablePtr */
96 static /*Str*/HashTable *stablehash;
99 /* Hash table mapping info table ptrs to DataCon names */
100 static HashTable *dchash;
103 /* List of currently loaded objects */
104 ObjectCode *objects = NULL; /* initially empty */
106 #if defined(OBJFORMAT_ELF)
107 static int ocVerifyImage_ELF ( ObjectCode* oc );
108 static int ocGetNames_ELF ( ObjectCode* oc );
109 static int ocResolve_ELF ( ObjectCode* oc );
110 #if defined(powerpc_HOST_ARCH)
111 static int ocAllocateJumpIslands_ELF ( ObjectCode* oc );
113 #elif defined(OBJFORMAT_PEi386)
114 static int ocVerifyImage_PEi386 ( ObjectCode* oc );
115 static int ocGetNames_PEi386 ( ObjectCode* oc );
116 static int ocResolve_PEi386 ( ObjectCode* oc );
117 #elif defined(OBJFORMAT_MACHO)
118 static int ocVerifyImage_MachO ( ObjectCode* oc );
119 static int ocGetNames_MachO ( ObjectCode* oc );
120 static int ocResolve_MachO ( ObjectCode* oc );
122 static int machoGetMisalignment( FILE * );
123 #ifdef powerpc_HOST_ARCH
124 static int ocAllocateJumpIslands_MachO ( ObjectCode* oc );
125 static void machoInitSymbolsWithoutUnderscore( void );
129 #if defined(x86_64_HOST_ARCH)
130 static void*x86_64_high_symbol( char *lbl, void *addr );
133 /* -----------------------------------------------------------------------------
134 * Built-in symbols from the RTS
137 typedef struct _RtsSymbolVal {
144 #define Maybe_Stable_Names SymX(mkWeakzh_fast) \
145 SymX(makeStableNamezh_fast) \
146 SymX(finalizzeWeakzh_fast)
148 /* These are not available in GUM!!! -- HWL */
149 #define Maybe_Stable_Names
152 #if !defined (mingw32_HOST_OS)
153 #define RTS_POSIX_ONLY_SYMBOLS \
154 SymX(signal_handlers) \
155 SymX(stg_sig_install) \
159 #if defined (cygwin32_HOST_OS)
160 #define RTS_MINGW_ONLY_SYMBOLS /**/
161 /* Don't have the ability to read import libs / archives, so
162 * we have to stupidly list a lot of what libcygwin.a
165 #define RTS_CYGWIN_ONLY_SYMBOLS \
243 #elif !defined(mingw32_HOST_OS)
244 #define RTS_MINGW_ONLY_SYMBOLS /**/
245 #define RTS_CYGWIN_ONLY_SYMBOLS /**/
246 #else /* defined(mingw32_HOST_OS) */
247 #define RTS_POSIX_ONLY_SYMBOLS /**/
248 #define RTS_CYGWIN_ONLY_SYMBOLS /**/
250 /* Extra syms gen'ed by mingw-2's gcc-3.2: */
252 #define RTS_MINGW_EXTRA_SYMS \
253 Sym(_imp____mb_cur_max) \
256 #define RTS_MINGW_EXTRA_SYMS
259 /* These are statically linked from the mingw libraries into the ghc
260 executable, so we have to employ this hack. */
261 #define RTS_MINGW_ONLY_SYMBOLS \
262 SymX(asyncReadzh_fast) \
263 SymX(asyncWritezh_fast) \
264 SymX(asyncDoProczh_fast) \
276 SymX(getservbyname) \
277 SymX(getservbyport) \
278 SymX(getprotobynumber) \
279 SymX(getprotobyname) \
280 SymX(gethostbyname) \
281 SymX(gethostbyaddr) \
328 SymX(rts_InstallConsoleEvent) \
329 SymX(rts_ConsoleHandlerDone) \
331 Sym(_imp___timezone) \
341 RTS_MINGW_EXTRA_SYMS \
345 #if defined(darwin_TARGET_OS) && HAVE_PRINTF_LDBLSTUB
346 #define RTS_DARWIN_ONLY_SYMBOLS \
347 Sym(asprintf$LDBLStub) \
351 Sym(fprintf$LDBLStub) \
352 Sym(fscanf$LDBLStub) \
353 Sym(fwprintf$LDBLStub) \
354 Sym(fwscanf$LDBLStub) \
355 Sym(printf$LDBLStub) \
356 Sym(scanf$LDBLStub) \
357 Sym(snprintf$LDBLStub) \
358 Sym(sprintf$LDBLStub) \
359 Sym(sscanf$LDBLStub) \
360 Sym(strtold$LDBLStub) \
361 Sym(swprintf$LDBLStub) \
362 Sym(swscanf$LDBLStub) \
363 Sym(syslog$LDBLStub) \
364 Sym(vasprintf$LDBLStub) \
366 Sym(verrc$LDBLStub) \
367 Sym(verrx$LDBLStub) \
368 Sym(vfprintf$LDBLStub) \
369 Sym(vfscanf$LDBLStub) \
370 Sym(vfwprintf$LDBLStub) \
371 Sym(vfwscanf$LDBLStub) \
372 Sym(vprintf$LDBLStub) \
373 Sym(vscanf$LDBLStub) \
374 Sym(vsnprintf$LDBLStub) \
375 Sym(vsprintf$LDBLStub) \
376 Sym(vsscanf$LDBLStub) \
377 Sym(vswprintf$LDBLStub) \
378 Sym(vswscanf$LDBLStub) \
379 Sym(vsyslog$LDBLStub) \
380 Sym(vwarn$LDBLStub) \
381 Sym(vwarnc$LDBLStub) \
382 Sym(vwarnx$LDBLStub) \
383 Sym(vwprintf$LDBLStub) \
384 Sym(vwscanf$LDBLStub) \
386 Sym(warnc$LDBLStub) \
387 Sym(warnx$LDBLStub) \
388 Sym(wcstold$LDBLStub) \
389 Sym(wprintf$LDBLStub) \
392 #define RTS_DARWIN_ONLY_SYMBOLS
396 # define MAIN_CAP_SYM SymX(MainCapability)
398 # define MAIN_CAP_SYM
401 #if !defined(mingw32_HOST_OS)
402 #define RTS_USER_SIGNALS_SYMBOLS \
403 SymX(setIOManagerPipe)
405 #define RTS_USER_SIGNALS_SYMBOLS \
406 SymX(sendIOManagerEvent) \
407 SymX(readIOManagerEvent) \
408 SymX(getIOManagerEvent) \
409 SymX(console_handler)
412 #ifdef TABLES_NEXT_TO_CODE
413 #define RTS_RET_SYMBOLS /* nothing */
415 #define RTS_RET_SYMBOLS \
416 SymX(stg_enter_ret) \
417 SymX(stg_gc_fun_ret) \
424 SymX(stg_ap_pv_ret) \
425 SymX(stg_ap_pp_ret) \
426 SymX(stg_ap_ppv_ret) \
427 SymX(stg_ap_ppp_ret) \
428 SymX(stg_ap_pppv_ret) \
429 SymX(stg_ap_pppp_ret) \
430 SymX(stg_ap_ppppp_ret) \
431 SymX(stg_ap_pppppp_ret)
434 #define RTS_SYMBOLS \
437 SymX(stg_enter_info) \
438 SymX(stg_gc_void_info) \
439 SymX(__stg_gc_enter_1) \
440 SymX(stg_gc_noregs) \
441 SymX(stg_gc_unpt_r1_info) \
442 SymX(stg_gc_unpt_r1) \
443 SymX(stg_gc_unbx_r1_info) \
444 SymX(stg_gc_unbx_r1) \
445 SymX(stg_gc_f1_info) \
447 SymX(stg_gc_d1_info) \
449 SymX(stg_gc_l1_info) \
452 SymX(stg_gc_fun_info) \
454 SymX(stg_gc_gen_info) \
455 SymX(stg_gc_gen_hp) \
457 SymX(stg_gen_yield) \
458 SymX(stg_yield_noregs) \
459 SymX(stg_yield_to_interpreter) \
460 SymX(stg_gen_block) \
461 SymX(stg_block_noregs) \
463 SymX(stg_block_takemvar) \
464 SymX(stg_block_putmvar) \
465 SymX(stg_seq_frame_info) \
467 SymX(MallocFailHook) \
469 SymX(OutOfHeapHook) \
470 SymX(StackOverflowHook) \
471 SymX(__encodeDouble) \
472 SymX(__encodeFloat) \
476 SymX(__gmpz_cmp_si) \
477 SymX(__gmpz_cmp_ui) \
478 SymX(__gmpz_get_si) \
479 SymX(__gmpz_get_ui) \
480 SymX(__int_encodeDouble) \
481 SymX(__int_encodeFloat) \
482 SymX(andIntegerzh_fast) \
483 SymX(atomicallyzh_fast) \
487 SymX(blockAsyncExceptionszh_fast) \
489 SymX(catchRetryzh_fast) \
490 SymX(catchSTMzh_fast) \
492 SymX(closure_flags) \
494 SymX(cmpIntegerzh_fast) \
495 SymX(cmpIntegerIntzh_fast) \
496 SymX(complementIntegerzh_fast) \
497 SymX(createAdjustor) \
498 SymX(decodeDoublezh_fast) \
499 SymX(decodeFloatzh_fast) \
502 SymX(deRefWeakzh_fast) \
503 SymX(deRefStablePtrzh_fast) \
504 SymX(dirty_MUT_VAR) \
505 SymX(divExactIntegerzh_fast) \
506 SymX(divModIntegerzh_fast) \
508 SymX(forkOnzh_fast) \
510 SymX(forkOS_createThread) \
511 SymX(freeHaskellFunctionPtr) \
512 SymX(freeStablePtr) \
513 SymX(getOrSetTypeableStore) \
514 SymX(gcdIntegerzh_fast) \
515 SymX(gcdIntegerIntzh_fast) \
516 SymX(gcdIntzh_fast) \
525 SymX(hs_perform_gc) \
526 SymX(hs_free_stable_ptr) \
527 SymX(hs_free_fun_ptr) \
529 SymX(infoPtrzh_fast) \
530 SymX(closurePayloadzh_fast) \
531 SymX(int2Integerzh_fast) \
532 SymX(integer2Intzh_fast) \
533 SymX(integer2Wordzh_fast) \
534 SymX(isCurrentThreadBoundzh_fast) \
535 SymX(isDoubleDenormalized) \
536 SymX(isDoubleInfinite) \
538 SymX(isDoubleNegativeZero) \
539 SymX(isEmptyMVarzh_fast) \
540 SymX(isFloatDenormalized) \
541 SymX(isFloatInfinite) \
543 SymX(isFloatNegativeZero) \
544 SymX(killThreadzh_fast) \
546 SymX(insertStableSymbol) \
549 SymX(lookupDataCon) \
550 SymX(makeStablePtrzh_fast) \
551 SymX(minusIntegerzh_fast) \
552 SymX(mkApUpd0zh_fast) \
553 SymX(myThreadIdzh_fast) \
554 SymX(labelThreadzh_fast) \
555 SymX(newArrayzh_fast) \
556 SymX(newBCOzh_fast) \
557 SymX(newByteArrayzh_fast) \
558 SymX_redirect(newCAF, newDynCAF) \
559 SymX(newMVarzh_fast) \
560 SymX(newMutVarzh_fast) \
561 SymX(newTVarzh_fast) \
562 SymX(atomicModifyMutVarzh_fast) \
563 SymX(newPinnedByteArrayzh_fast) \
565 SymX(orIntegerzh_fast) \
567 SymX(performMajorGC) \
568 SymX(plusIntegerzh_fast) \
571 SymX(putMVarzh_fast) \
572 SymX(quotIntegerzh_fast) \
573 SymX(quotRemIntegerzh_fast) \
575 SymX(raiseIOzh_fast) \
576 SymX(readTVarzh_fast) \
577 SymX(remIntegerzh_fast) \
578 SymX(resetNonBlockingFd) \
583 SymX(rts_checkSchedStatus) \
586 SymX(rts_evalLazyIO) \
587 SymX(rts_evalStableIO) \
591 SymX(rts_getDouble) \
596 SymX(rts_getFunPtr) \
597 SymX(rts_getStablePtr) \
598 SymX(rts_getThreadId) \
600 SymX(rts_getWord32) \
613 SymX(rts_mkStablePtr) \
621 SymX(rtsSupportsBoundThreads) \
622 SymX(__hscore_get_saved_termios) \
623 SymX(__hscore_set_saved_termios) \
625 SymX(startupHaskell) \
626 SymX(shutdownHaskell) \
627 SymX(shutdownHaskellAndExit) \
628 SymX(stable_ptr_table) \
629 SymX(stackOverflow) \
630 SymX(stg_CAF_BLACKHOLE_info) \
631 SymX(awakenBlockedQueue) \
632 SymX(stg_CHARLIKE_closure) \
633 SymX(stg_EMPTY_MVAR_info) \
634 SymX(stg_IND_STATIC_info) \
635 SymX(stg_INTLIKE_closure) \
636 SymX(stg_MUT_ARR_PTRS_DIRTY_info) \
637 SymX(stg_MUT_ARR_PTRS_FROZEN_info) \
638 SymX(stg_MUT_ARR_PTRS_FROZEN0_info) \
639 SymX(stg_WEAK_info) \
640 SymX(stg_ap_v_info) \
641 SymX(stg_ap_f_info) \
642 SymX(stg_ap_d_info) \
643 SymX(stg_ap_l_info) \
644 SymX(stg_ap_n_info) \
645 SymX(stg_ap_p_info) \
646 SymX(stg_ap_pv_info) \
647 SymX(stg_ap_pp_info) \
648 SymX(stg_ap_ppv_info) \
649 SymX(stg_ap_ppp_info) \
650 SymX(stg_ap_pppv_info) \
651 SymX(stg_ap_pppp_info) \
652 SymX(stg_ap_ppppp_info) \
653 SymX(stg_ap_pppppp_info) \
654 SymX(stg_ap_0_fast) \
655 SymX(stg_ap_v_fast) \
656 SymX(stg_ap_f_fast) \
657 SymX(stg_ap_d_fast) \
658 SymX(stg_ap_l_fast) \
659 SymX(stg_ap_n_fast) \
660 SymX(stg_ap_p_fast) \
661 SymX(stg_ap_pv_fast) \
662 SymX(stg_ap_pp_fast) \
663 SymX(stg_ap_ppv_fast) \
664 SymX(stg_ap_ppp_fast) \
665 SymX(stg_ap_pppv_fast) \
666 SymX(stg_ap_pppp_fast) \
667 SymX(stg_ap_ppppp_fast) \
668 SymX(stg_ap_pppppp_fast) \
669 SymX(stg_ap_1_upd_info) \
670 SymX(stg_ap_2_upd_info) \
671 SymX(stg_ap_3_upd_info) \
672 SymX(stg_ap_4_upd_info) \
673 SymX(stg_ap_5_upd_info) \
674 SymX(stg_ap_6_upd_info) \
675 SymX(stg_ap_7_upd_info) \
677 SymX(stg_sel_0_upd_info) \
678 SymX(stg_sel_10_upd_info) \
679 SymX(stg_sel_11_upd_info) \
680 SymX(stg_sel_12_upd_info) \
681 SymX(stg_sel_13_upd_info) \
682 SymX(stg_sel_14_upd_info) \
683 SymX(stg_sel_15_upd_info) \
684 SymX(stg_sel_1_upd_info) \
685 SymX(stg_sel_2_upd_info) \
686 SymX(stg_sel_3_upd_info) \
687 SymX(stg_sel_4_upd_info) \
688 SymX(stg_sel_5_upd_info) \
689 SymX(stg_sel_6_upd_info) \
690 SymX(stg_sel_7_upd_info) \
691 SymX(stg_sel_8_upd_info) \
692 SymX(stg_sel_9_upd_info) \
693 SymX(stg_upd_frame_info) \
694 SymX(suspendThread) \
695 SymX(takeMVarzh_fast) \
696 SymX(timesIntegerzh_fast) \
697 SymX(tryPutMVarzh_fast) \
698 SymX(tryTakeMVarzh_fast) \
699 SymX(unblockAsyncExceptionszh_fast) \
701 SymX(unsafeThawArrayzh_fast) \
702 SymX(waitReadzh_fast) \
703 SymX(waitWritezh_fast) \
704 SymX(word2Integerzh_fast) \
705 SymX(writeTVarzh_fast) \
706 SymX(xorIntegerzh_fast) \
708 SymX(stg_interp_constr_entry) \
709 SymX(stg_interp_constr1_entry) \
710 SymX(stg_interp_constr2_entry) \
711 SymX(stg_interp_constr3_entry) \
712 SymX(stg_interp_constr4_entry) \
713 SymX(stg_interp_constr5_entry) \
714 SymX(stg_interp_constr6_entry) \
715 SymX(stg_interp_constr7_entry) \
716 SymX(stg_interp_constr8_entry) \
719 SymX(getAllocations) \
722 RTS_USER_SIGNALS_SYMBOLS
724 #ifdef SUPPORT_LONG_LONGS
725 #define RTS_LONG_LONG_SYMS \
726 SymX(int64ToIntegerzh_fast) \
727 SymX(word64ToIntegerzh_fast)
729 #define RTS_LONG_LONG_SYMS /* nothing */
732 // 64-bit support functions in libgcc.a
733 #if defined(__GNUC__) && SIZEOF_VOID_P <= 4
734 #define RTS_LIBGCC_SYMBOLS \
744 #elif defined(ia64_HOST_ARCH)
745 #define RTS_LIBGCC_SYMBOLS \
753 #define RTS_LIBGCC_SYMBOLS
756 #if defined(darwin_HOST_OS) && defined(powerpc_HOST_ARCH)
757 // Symbols that don't have a leading underscore
758 // on Mac OS X. They have to receive special treatment,
759 // see machoInitSymbolsWithoutUnderscore()
760 #define RTS_MACHO_NOUNDERLINE_SYMBOLS \
765 /* entirely bogus claims about types of these symbols */
766 #define Sym(vvv) extern void vvv(void);
767 #define SymX(vvv) /**/
768 #define SymX_redirect(vvv,xxx) /**/
772 RTS_POSIX_ONLY_SYMBOLS
773 RTS_MINGW_ONLY_SYMBOLS
774 RTS_CYGWIN_ONLY_SYMBOLS
775 RTS_DARWIN_ONLY_SYMBOLS
781 #ifdef LEADING_UNDERSCORE
782 #define MAYBE_LEADING_UNDERSCORE_STR(s) ("_" s)
784 #define MAYBE_LEADING_UNDERSCORE_STR(s) (s)
787 #define Sym(vvv) { MAYBE_LEADING_UNDERSCORE_STR(#vvv), \
789 #define SymX(vvv) Sym(vvv)
791 // SymX_redirect allows us to redirect references to one symbol to
792 // another symbol. See newCAF/newDynCAF for an example.
793 #define SymX_redirect(vvv,xxx) \
794 { MAYBE_LEADING_UNDERSCORE_STR(#vvv), \
797 static RtsSymbolVal rtsSyms[] = {
801 RTS_POSIX_ONLY_SYMBOLS
802 RTS_MINGW_ONLY_SYMBOLS
803 RTS_CYGWIN_ONLY_SYMBOLS
804 RTS_DARWIN_ONLY_SYMBOLS
806 #if defined(darwin_HOST_OS) && defined(i386_HOST_ARCH)
807 // dyld stub code contains references to this,
808 // but it should never be called because we treat
809 // lazy pointers as nonlazy.
810 { "dyld_stub_binding_helper", (void*)0xDEADBEEF },
812 { 0, 0 } /* sentinel */
817 /* -----------------------------------------------------------------------------
818 * Insert symbols into hash tables, checking for duplicates.
820 int isSuffixOf(char* x, char* suffix);
822 static void ghciInsertStrHashTable ( char* obj_name,
828 if (lookupHashTable(table, (StgWord)key) == NULL)
830 insertStrHashTable(table, (StgWord)key, data);
831 #if defined(DEBUGGER)
832 // Insert the reverse pair in the datacon hash if it is a closure
834 if(isSuffixOf(key, "static_info") || isSuffixOf(key, "con_info")) {
835 insertHashTable(dchash, (StgWord)data, key);
836 // debugBelch("DChash addSymbol: %s (%p)\n", key, data);
844 "GHCi runtime linker: fatal error: I found a duplicate definition for symbol\n"
846 "whilst processing object file\n"
848 "This could be caused by:\n"
849 " * Loading two different object files which export the same symbol\n"
850 " * Specifying the same object file twice on the GHCi command line\n"
851 " * An incorrect `package.conf' entry, causing some object to be\n"
853 "GHCi cannot safely continue in this situation. Exiting now. Sorry.\n"
860 /* -----------------------------------------------------------------------------
861 * initialize the object linker
865 static int linker_init_done = 0 ;
867 #if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
868 static void *dl_prog_handle;
876 /* Make initLinker idempotent, so we can call it
877 before evey relevant operation; that means we
878 don't need to initialise the linker separately */
879 if (linker_init_done == 1) { return; } else {
880 linker_init_done = 1;
883 stablehash = allocStrHashTable();
884 symhash = allocStrHashTable();
885 #if defined(DEBUGGER)
886 dchash = allocHashTable();
889 /* populate the symbol table with stuff from the RTS */
890 for (sym = rtsSyms; sym->lbl != NULL; sym++) {
891 ghciInsertStrHashTable("(GHCi built-in symbols)",
892 symhash, sym->lbl, sym->addr);
894 # if defined(OBJFORMAT_MACHO) && defined(powerpc_HOST_ARCH)
895 machoInitSymbolsWithoutUnderscore();
898 # if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
899 # if defined(RTLD_DEFAULT)
900 dl_prog_handle = RTLD_DEFAULT;
902 dl_prog_handle = dlopen(NULL, RTLD_LAZY);
903 # endif /* RTLD_DEFAULT */
907 /* -----------------------------------------------------------------------------
908 * Loading DLL or .so dynamic libraries
909 * -----------------------------------------------------------------------------
911 * Add a DLL from which symbols may be found. In the ELF case, just
912 * do RTLD_GLOBAL-style add, so no further messing around needs to
913 * happen in order that symbols in the loaded .so are findable --
914 * lookupSymbol() will subsequently see them by dlsym on the program's
915 * dl-handle. Returns NULL if success, otherwise ptr to an err msg.
917 * In the PEi386 case, open the DLLs and put handles to them in a
918 * linked list. When looking for a symbol, try all handles in the
919 * list. This means that we need to load even DLLs that are guaranteed
920 * to be in the ghc.exe image already, just so we can get a handle
921 * to give to loadSymbol, so that we can find the symbols. For such
922 * libraries, the LoadLibrary call should be a no-op except for returning
927 #if defined(OBJFORMAT_PEi386)
928 /* A record for storing handles into DLLs. */
933 struct _OpenedDLL* next;
938 /* A list thereof. */
939 static OpenedDLL* opened_dlls = NULL;
943 addDLL( char *dll_name )
945 # if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
946 /* ------------------- ELF DLL loader ------------------- */
952 hdl= dlopen(dll_name, RTLD_NOW | RTLD_GLOBAL);
955 /* dlopen failed; return a ptr to the error msg. */
957 if (errmsg == NULL) errmsg = "addDLL: unknown error";
964 # elif defined(OBJFORMAT_PEi386)
965 /* ------------------- Win32 DLL loader ------------------- */
973 /* debugBelch("\naddDLL; dll_name = `%s'\n", dll_name); */
975 /* See if we've already got it, and ignore if so. */
976 for (o_dll = opened_dlls; o_dll != NULL; o_dll = o_dll->next) {
977 if (0 == strcmp(o_dll->name, dll_name))
981 /* The file name has no suffix (yet) so that we can try
982 both foo.dll and foo.drv
984 The documentation for LoadLibrary says:
985 If no file name extension is specified in the lpFileName
986 parameter, the default library extension .dll is
987 appended. However, the file name string can include a trailing
988 point character (.) to indicate that the module name has no
991 buf = stgMallocBytes(strlen(dll_name) + 10, "addDLL");
992 sprintf(buf, "%s.DLL", dll_name);
993 instance = LoadLibrary(buf);
994 if (instance == NULL) {
995 sprintf(buf, "%s.DRV", dll_name); // KAA: allow loading of drivers (like winspool.drv)
996 instance = LoadLibrary(buf);
997 if (instance == NULL) {
1000 /* LoadLibrary failed; return a ptr to the error msg. */
1001 return "addDLL: unknown error";
1006 /* Add this DLL to the list of DLLs in which to search for symbols. */
1007 o_dll = stgMallocBytes( sizeof(OpenedDLL), "addDLL" );
1008 o_dll->name = stgMallocBytes(1+strlen(dll_name), "addDLL");
1009 strcpy(o_dll->name, dll_name);
1010 o_dll->instance = instance;
1011 o_dll->next = opened_dlls;
1012 opened_dlls = o_dll;
1016 barf("addDLL: not implemented on this platform");
1020 /* -----------------------------------------------------------------------------
1021 * insert a stable symbol in the hash table
1025 insertStableSymbol(char* obj_name, char* key, StgPtr p)
1027 ghciInsertStrHashTable(obj_name, stablehash, key, getStablePtr(p));
1031 /* -----------------------------------------------------------------------------
1032 * insert a symbol in the hash table
1035 insertSymbol(char* obj_name, char* key, void* data)
1037 ghciInsertStrHashTable(obj_name, symhash, key, data);
1040 /* -----------------------------------------------------------------------------
1041 * lookup a symbol in the hash table
1044 lookupSymbol( char *lbl )
1048 ASSERT(symhash != NULL);
1049 val = lookupStrHashTable(symhash, lbl);
1052 # if defined(OBJFORMAT_ELF)
1053 # if defined(x86_64_HOST_ARCH)
1054 val = dlsym(dl_prog_handle, lbl);
1055 if (val >= (void *)0x80000000) {
1057 new_val = x86_64_high_symbol(lbl, val);
1058 IF_DEBUG(linker,debugBelch("lookupSymbol: relocating out of range symbol: %s = %p, now %p\n", lbl, val, new_val));
1064 return dlsym(dl_prog_handle, lbl);
1066 # elif defined(OBJFORMAT_MACHO)
1067 if(NSIsSymbolNameDefined(lbl)) {
1068 NSSymbol symbol = NSLookupAndBindSymbol(lbl);
1069 return NSAddressOfSymbol(symbol);
1073 # elif defined(OBJFORMAT_PEi386)
1076 for (o_dll = opened_dlls; o_dll != NULL; o_dll = o_dll->next) {
1077 /* debugBelch("look in %s for %s\n", o_dll->name, lbl); */
1078 if (lbl[0] == '_') {
1079 /* HACK: if the name has an initial underscore, try stripping
1080 it off & look that up first. I've yet to verify whether there's
1081 a Rule that governs whether an initial '_' *should always* be
1082 stripped off when mapping from import lib name to the DLL name.
1084 sym = GetProcAddress(o_dll->instance, (lbl+1));
1086 /*debugBelch("found %s in %s\n", lbl+1,o_dll->name);*/
1090 sym = GetProcAddress(o_dll->instance, lbl);
1092 /*debugBelch("found %s in %s\n", lbl,o_dll->name);*/
1106 #if defined(DEBUGGER)
1108 lookupDataCon( StgWord addr )
1112 ASSERT(dchash != NULL);
1113 val = lookupHashTable(dchash, addr);
1118 char* lookupDataCon( StgWord addr )
1125 __attribute((unused))
1127 lookupLocalSymbol( ObjectCode* oc, char *lbl )
1131 val = lookupStrHashTable(oc->lochash, lbl);
1141 /* -----------------------------------------------------------------------------
1142 * Debugging aid: look in GHCi's object symbol tables for symbols
1143 * within DELTA bytes of the specified address, and show their names.
1146 void ghci_enquire ( char* addr );
1148 void ghci_enquire ( char* addr )
1153 const int DELTA = 64;
1158 for (oc = objects; oc; oc = oc->next) {
1159 for (i = 0; i < oc->n_symbols; i++) {
1160 sym = oc->symbols[i];
1161 if (sym == NULL) continue;
1162 // debugBelch("enquire %p %p\n", sym, oc->lochash);
1164 if (oc->lochash != NULL) {
1165 a = lookupStrHashTable(oc->lochash, sym);
1168 a = lookupStrHashTable(symhash, sym);
1171 // debugBelch("ghci_enquire: can't find %s\n", sym);
1173 else if (addr-DELTA <= a && a <= addr+DELTA) {
1174 debugBelch("%p + %3d == `%s'\n", addr, (int)(a - addr), sym);
1181 #ifdef ia64_HOST_ARCH
1182 static unsigned int PLTSize(void);
1185 /* -----------------------------------------------------------------------------
1186 * Load an obj (populate the global symbol table, but don't resolve yet)
1188 * Returns: 1 if ok, 0 on error.
1191 loadObj( char *path )
1198 void *map_addr = NULL;
1204 /* debugBelch("loadObj %s\n", path ); */
1206 /* Check that we haven't already loaded this object.
1207 Ignore requests to load multiple times */
1211 for (o = objects; o; o = o->next) {
1212 if (0 == strcmp(o->fileName, path)) {
1214 break; /* don't need to search further */
1218 IF_DEBUG(linker, debugBelch(
1219 "GHCi runtime linker: warning: looks like you're trying to load the\n"
1220 "same object file twice:\n"
1222 "GHCi will ignore this, but be warned.\n"
1224 return 1; /* success */
1228 oc = stgMallocBytes(sizeof(ObjectCode), "loadObj(oc)");
1230 # if defined(OBJFORMAT_ELF)
1231 oc->formatName = "ELF";
1232 # elif defined(OBJFORMAT_PEi386)
1233 oc->formatName = "PEi386";
1234 # elif defined(OBJFORMAT_MACHO)
1235 oc->formatName = "Mach-O";
1238 barf("loadObj: not implemented on this platform");
1241 r = stat(path, &st);
1242 if (r == -1) { return 0; }
1244 /* sigh, strdup() isn't a POSIX function, so do it the long way */
1245 oc->fileName = stgMallocBytes( strlen(path)+1, "loadObj" );
1246 strcpy(oc->fileName, path);
1248 oc->fileSize = st.st_size;
1250 oc->sections = NULL;
1251 oc->lochash = allocStrHashTable();
1252 oc->proddables = NULL;
1254 /* chain it onto the list of objects */
1259 #define ROUND_UP(x,size) ((x + size - 1) & ~(size - 1))
1261 /* On many architectures malloc'd memory isn't executable, so we need to use mmap. */
1263 #if defined(openbsd_HOST_OS)
1264 fd = open(path, O_RDONLY, S_IRUSR);
1266 fd = open(path, O_RDONLY);
1269 barf("loadObj: can't open `%s'", path);
1271 pagesize = getpagesize();
1273 #ifdef ia64_HOST_ARCH
1274 /* The PLT needs to be right before the object */
1275 n = ROUND_UP(PLTSize(), pagesize);
1276 oc->plt = mmap(NULL, n, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
1277 if (oc->plt == MAP_FAILED)
1278 barf("loadObj: can't allocate PLT");
1281 map_addr = oc->plt + n;
1284 n = ROUND_UP(oc->fileSize, pagesize);
1286 /* Link objects into the lower 2Gb on x86_64. GHC assumes the
1287 * small memory model on this architecture (see gcc docs,
1290 #ifdef x86_64_HOST_ARCH
1291 #define EXTRA_MAP_FLAGS MAP_32BIT
1293 #define EXTRA_MAP_FLAGS 0
1296 oc->image = mmap(map_addr, n, PROT_EXEC|PROT_READ|PROT_WRITE,
1297 MAP_PRIVATE|EXTRA_MAP_FLAGS, fd, 0);
1298 if (oc->image == MAP_FAILED)
1299 barf("loadObj: can't map `%s'", path);
1303 #else /* !USE_MMAP */
1305 /* load the image into memory */
1306 f = fopen(path, "rb");
1308 barf("loadObj: can't read `%s'", path);
1310 # if defined(mingw32_HOST_OS)
1311 // TODO: We would like to use allocateExec here, but allocateExec
1312 // cannot currently allocate blocks large enough.
1313 oc->image = VirtualAlloc(NULL, oc->fileSize, MEM_RESERVE | MEM_COMMIT,
1314 PAGE_EXECUTE_READWRITE);
1315 # elif defined(darwin_HOST_OS)
1316 // In a Mach-O .o file, all sections can and will be misaligned
1317 // if the total size of the headers is not a multiple of the
1318 // desired alignment. This is fine for .o files that only serve
1319 // as input for the static linker, but it's not fine for us,
1320 // as SSE (used by gcc for floating point) and Altivec require
1321 // 16-byte alignment.
1322 // We calculate the correct alignment from the header before
1323 // reading the file, and then we misalign oc->image on purpose so
1324 // that the actual sections end up aligned again.
1325 oc->misalignment = machoGetMisalignment(f);
1326 oc->image = stgMallocBytes(oc->fileSize + oc->misalignment, "loadObj(image)");
1327 oc->image += oc->misalignment;
1329 oc->image = stgMallocBytes(oc->fileSize, "loadObj(image)");
1332 n = fread ( oc->image, 1, oc->fileSize, f );
1333 if (n != oc->fileSize)
1334 barf("loadObj: error whilst reading `%s'", path);
1338 #endif /* USE_MMAP */
1340 # if defined(OBJFORMAT_MACHO) && defined(powerpc_HOST_ARCH)
1341 r = ocAllocateJumpIslands_MachO ( oc );
1342 if (!r) { return r; }
1343 # elif defined(OBJFORMAT_ELF) && defined(powerpc_HOST_ARCH)
1344 r = ocAllocateJumpIslands_ELF ( oc );
1345 if (!r) { return r; }
1348 /* verify the in-memory image */
1349 # if defined(OBJFORMAT_ELF)
1350 r = ocVerifyImage_ELF ( oc );
1351 # elif defined(OBJFORMAT_PEi386)
1352 r = ocVerifyImage_PEi386 ( oc );
1353 # elif defined(OBJFORMAT_MACHO)
1354 r = ocVerifyImage_MachO ( oc );
1356 barf("loadObj: no verify method");
1358 if (!r) { return r; }
1360 /* build the symbol list for this image */
1361 # if defined(OBJFORMAT_ELF)
1362 r = ocGetNames_ELF ( oc );
1363 # elif defined(OBJFORMAT_PEi386)
1364 r = ocGetNames_PEi386 ( oc );
1365 # elif defined(OBJFORMAT_MACHO)
1366 r = ocGetNames_MachO ( oc );
1368 barf("loadObj: no getNames method");
1370 if (!r) { return r; }
1372 /* loaded, but not resolved yet */
1373 oc->status = OBJECT_LOADED;
1378 /* -----------------------------------------------------------------------------
1379 * resolve all the currently unlinked objects in memory
1381 * Returns: 1 if ok, 0 on error.
1391 for (oc = objects; oc; oc = oc->next) {
1392 if (oc->status != OBJECT_RESOLVED) {
1393 # if defined(OBJFORMAT_ELF)
1394 r = ocResolve_ELF ( oc );
1395 # elif defined(OBJFORMAT_PEi386)
1396 r = ocResolve_PEi386 ( oc );
1397 # elif defined(OBJFORMAT_MACHO)
1398 r = ocResolve_MachO ( oc );
1400 barf("resolveObjs: not implemented on this platform");
1402 if (!r) { return r; }
1403 oc->status = OBJECT_RESOLVED;
1409 /* -----------------------------------------------------------------------------
1410 * delete an object from the pool
1413 unloadObj( char *path )
1415 ObjectCode *oc, *prev;
1417 ASSERT(symhash != NULL);
1418 ASSERT(objects != NULL);
1423 for (oc = objects; oc; prev = oc, oc = oc->next) {
1424 if (!strcmp(oc->fileName,path)) {
1426 /* Remove all the mappings for the symbols within this
1431 for (i = 0; i < oc->n_symbols; i++) {
1432 if (oc->symbols[i] != NULL) {
1433 removeStrHashTable(symhash, oc->symbols[i], NULL);
1441 prev->next = oc->next;
1444 // We're going to leave this in place, in case there are
1445 // any pointers from the heap into it:
1446 // #ifdef mingw32_HOST_OS
1447 // VirtualFree(oc->image);
1449 // stgFree(oc->image);
1451 stgFree(oc->fileName);
1452 stgFree(oc->symbols);
1453 stgFree(oc->sections);
1454 /* The local hash table should have been freed at the end
1455 of the ocResolve_ call on it. */
1456 ASSERT(oc->lochash == NULL);
1462 errorBelch("unloadObj: can't find `%s' to unload", path);
1466 /* -----------------------------------------------------------------------------
1467 * Sanity checking. For each ObjectCode, maintain a list of address ranges
1468 * which may be prodded during relocation, and abort if we try and write
1469 * outside any of these.
1471 static void addProddableBlock ( ObjectCode* oc, void* start, int size )
1474 = stgMallocBytes(sizeof(ProddableBlock), "addProddableBlock");
1475 /* debugBelch("aPB %p %p %d\n", oc, start, size); */
1479 pb->next = oc->proddables;
1480 oc->proddables = pb;
1483 static void checkProddableBlock ( ObjectCode* oc, void* addr )
1486 for (pb = oc->proddables; pb != NULL; pb = pb->next) {
1487 char* s = (char*)(pb->start);
1488 char* e = s + pb->size - 1;
1489 char* a = (char*)addr;
1490 /* Assumes that the biggest fixup involves a 4-byte write. This
1491 probably needs to be changed to 8 (ie, +7) on 64-bit
1493 if (a >= s && (a+3) <= e) return;
1495 barf("checkProddableBlock: invalid fixup in runtime linker");
1498 /* -----------------------------------------------------------------------------
1499 * Section management.
1501 static void addSection ( ObjectCode* oc, SectionKind kind,
1502 void* start, void* end )
1504 Section* s = stgMallocBytes(sizeof(Section), "addSection");
1508 s->next = oc->sections;
1511 debugBelch("addSection: %p-%p (size %d), kind %d\n",
1512 start, ((char*)end)-1, end - start + 1, kind );
1517 /* --------------------------------------------------------------------------
1518 * PowerPC specifics (jump islands)
1519 * ------------------------------------------------------------------------*/
1521 #if defined(powerpc_HOST_ARCH)
1524 ocAllocateJumpIslands
1526 Allocate additional space at the end of the object file image to make room
1529 PowerPC relative branch instructions have a 24 bit displacement field.
1530 As PPC code is always 4-byte-aligned, this yields a +-32MB range.
1531 If a particular imported symbol is outside this range, we have to redirect
1532 the jump to a short piece of new code that just loads the 32bit absolute
1533 address and jumps there.
1534 This function just allocates space for one 16 byte ppcJumpIsland for every
1535 undefined symbol in the object file. The code for the islands is filled in by
1536 makeJumpIsland below.
1539 static int ocAllocateJumpIslands( ObjectCode* oc, int count, int first )
1545 int misalignment = 0;
1547 misalignment = oc->misalignment;
1552 // round up to the nearest 4
1553 aligned = (oc->fileSize + 3) & ~3;
1556 #ifndef linux_HOST_OS /* mremap is a linux extension */
1557 #error ocAllocateJumpIslands doesnt want USE_MMAP to be defined
1560 pagesize = getpagesize();
1561 n = ROUND_UP( oc->fileSize, pagesize );
1562 m = ROUND_UP( aligned + sizeof (ppcJumpIsland) * count, pagesize );
1564 /* If we have a half-page-size file and map one page of it then
1565 * the part of the page after the size of the file remains accessible.
1566 * If, however, we map in 2 pages, the 2nd page is not accessible
1567 * and will give a "Bus Error" on access. To get around this, we check
1568 * if we need any extra pages for the jump islands and map them in
1569 * anonymously. We must check that we actually require extra pages
1570 * otherwise the attempt to mmap 0 pages of anonymous memory will
1576 /* The effect of this mremap() call is only the ensure that we have
1577 * a sufficient number of virtually contiguous pages. As returned from
1578 * mremap, the pages past the end of the file are not backed. We give
1579 * them a backing by using MAP_FIXED to map in anonymous pages.
1581 oc->image = mremap( oc->image, n, m, MREMAP_MAYMOVE );
1583 if( oc->image == MAP_FAILED )
1585 errorBelch( "Unable to mremap for Jump Islands\n" );
1589 if( mmap( oc->image + n, m - n, PROT_READ | PROT_WRITE | PROT_EXEC,
1590 MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED, 0, 0 ) == MAP_FAILED )
1592 errorBelch( "Unable to mmap( MAP_FIXED ) for Jump Islands\n" );
1598 oc->image -= misalignment;
1599 oc->image = stgReallocBytes( oc->image,
1601 aligned + sizeof (ppcJumpIsland) * count,
1602 "ocAllocateJumpIslands" );
1603 oc->image += misalignment;
1604 #endif /* USE_MMAP */
1606 oc->jump_islands = (ppcJumpIsland *) (oc->image + aligned);
1607 memset( oc->jump_islands, 0, sizeof (ppcJumpIsland) * count );
1610 oc->jump_islands = NULL;
1612 oc->island_start_symbol = first;
1613 oc->n_islands = count;
1618 static unsigned long makeJumpIsland( ObjectCode* oc,
1619 unsigned long symbolNumber,
1620 unsigned long target )
1622 ppcJumpIsland *island;
1624 if( symbolNumber < oc->island_start_symbol ||
1625 symbolNumber - oc->island_start_symbol > oc->n_islands)
1628 island = &oc->jump_islands[symbolNumber - oc->island_start_symbol];
1630 // lis r12, hi16(target)
1631 island->lis_r12 = 0x3d80;
1632 island->hi_addr = target >> 16;
1634 // ori r12, r12, lo16(target)
1635 island->ori_r12_r12 = 0x618c;
1636 island->lo_addr = target & 0xffff;
1639 island->mtctr_r12 = 0x7d8903a6;
1642 island->bctr = 0x4e800420;
1644 return (unsigned long) island;
1648 ocFlushInstructionCache
1650 Flush the data & instruction caches.
1651 Because the PPC has split data/instruction caches, we have to
1652 do that whenever we modify code at runtime.
1655 static void ocFlushInstructionCache( ObjectCode *oc )
1657 int n = (oc->fileSize + sizeof( ppcJumpIsland ) * oc->n_islands + 3) / 4;
1658 unsigned long *p = (unsigned long *) oc->image;
1662 __asm__ volatile ( "dcbf 0,%0\n\t"
1670 __asm__ volatile ( "sync\n\t"
1676 /* --------------------------------------------------------------------------
1677 * PEi386 specifics (Win32 targets)
1678 * ------------------------------------------------------------------------*/
1680 /* The information for this linker comes from
1681 Microsoft Portable Executable
1682 and Common Object File Format Specification
1683 revision 5.1 January 1998
1684 which SimonM says comes from the MS Developer Network CDs.
1686 It can be found there (on older CDs), but can also be found
1689 http://www.microsoft.com/hwdev/hardware/PECOFF.asp
1691 (this is Rev 6.0 from February 1999).
1693 Things move, so if that fails, try searching for it via
1695 http://www.google.com/search?q=PE+COFF+specification
1697 The ultimate reference for the PE format is the Winnt.h
1698 header file that comes with the Platform SDKs; as always,
1699 implementations will drift wrt their documentation.
1701 A good background article on the PE format is Matt Pietrek's
1702 March 1994 article in Microsoft System Journal (MSJ)
1703 (Vol.9, No. 3): "Peering Inside the PE: A Tour of the
1704 Win32 Portable Executable File Format." The info in there
1705 has recently been updated in a two part article in
1706 MSDN magazine, issues Feb and March 2002,
1707 "Inside Windows: An In-Depth Look into the Win32 Portable
1708 Executable File Format"
1710 John Levine's book "Linkers and Loaders" contains useful
1715 #if defined(OBJFORMAT_PEi386)
1719 typedef unsigned char UChar;
1720 typedef unsigned short UInt16;
1721 typedef unsigned int UInt32;
1728 UInt16 NumberOfSections;
1729 UInt32 TimeDateStamp;
1730 UInt32 PointerToSymbolTable;
1731 UInt32 NumberOfSymbols;
1732 UInt16 SizeOfOptionalHeader;
1733 UInt16 Characteristics;
1737 #define sizeof_COFF_header 20
1744 UInt32 VirtualAddress;
1745 UInt32 SizeOfRawData;
1746 UInt32 PointerToRawData;
1747 UInt32 PointerToRelocations;
1748 UInt32 PointerToLinenumbers;
1749 UInt16 NumberOfRelocations;
1750 UInt16 NumberOfLineNumbers;
1751 UInt32 Characteristics;
1755 #define sizeof_COFF_section 40
1762 UInt16 SectionNumber;
1765 UChar NumberOfAuxSymbols;
1769 #define sizeof_COFF_symbol 18
1774 UInt32 VirtualAddress;
1775 UInt32 SymbolTableIndex;
1780 #define sizeof_COFF_reloc 10
1783 /* From PE spec doc, section 3.3.2 */
1784 /* Note use of MYIMAGE_* since IMAGE_* are already defined in
1785 windows.h -- for the same purpose, but I want to know what I'm
1787 #define MYIMAGE_FILE_RELOCS_STRIPPED 0x0001
1788 #define MYIMAGE_FILE_EXECUTABLE_IMAGE 0x0002
1789 #define MYIMAGE_FILE_DLL 0x2000
1790 #define MYIMAGE_FILE_SYSTEM 0x1000
1791 #define MYIMAGE_FILE_BYTES_REVERSED_HI 0x8000
1792 #define MYIMAGE_FILE_BYTES_REVERSED_LO 0x0080
1793 #define MYIMAGE_FILE_32BIT_MACHINE 0x0100
1795 /* From PE spec doc, section 5.4.2 and 5.4.4 */
1796 #define MYIMAGE_SYM_CLASS_EXTERNAL 2
1797 #define MYIMAGE_SYM_CLASS_STATIC 3
1798 #define MYIMAGE_SYM_UNDEFINED 0
1800 /* From PE spec doc, section 4.1 */
1801 #define MYIMAGE_SCN_CNT_CODE 0x00000020
1802 #define MYIMAGE_SCN_CNT_INITIALIZED_DATA 0x00000040
1803 #define MYIMAGE_SCN_LNK_NRELOC_OVFL 0x01000000
1805 /* From PE spec doc, section 5.2.1 */
1806 #define MYIMAGE_REL_I386_DIR32 0x0006
1807 #define MYIMAGE_REL_I386_REL32 0x0014
1810 /* We use myindex to calculate array addresses, rather than
1811 simply doing the normal subscript thing. That's because
1812 some of the above structs have sizes which are not
1813 a whole number of words. GCC rounds their sizes up to a
1814 whole number of words, which means that the address calcs
1815 arising from using normal C indexing or pointer arithmetic
1816 are just plain wrong. Sigh.
1819 myindex ( int scale, void* base, int index )
1822 ((UChar*)base) + scale * index;
1827 printName ( UChar* name, UChar* strtab )
1829 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
1830 UInt32 strtab_offset = * (UInt32*)(name+4);
1831 debugBelch("%s", strtab + strtab_offset );
1834 for (i = 0; i < 8; i++) {
1835 if (name[i] == 0) break;
1836 debugBelch("%c", name[i] );
1843 copyName ( UChar* name, UChar* strtab, UChar* dst, int dstSize )
1845 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
1846 UInt32 strtab_offset = * (UInt32*)(name+4);
1847 strncpy ( dst, strtab+strtab_offset, dstSize );
1853 if (name[i] == 0) break;
1863 cstring_from_COFF_symbol_name ( UChar* name, UChar* strtab )
1866 /* If the string is longer than 8 bytes, look in the
1867 string table for it -- this will be correctly zero terminated.
1869 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
1870 UInt32 strtab_offset = * (UInt32*)(name+4);
1871 return ((UChar*)strtab) + strtab_offset;
1873 /* Otherwise, if shorter than 8 bytes, return the original,
1874 which by defn is correctly terminated.
1876 if (name[7]==0) return name;
1877 /* The annoying case: 8 bytes. Copy into a temporary
1878 (which is never freed ...)
1880 newstr = stgMallocBytes(9, "cstring_from_COFF_symbol_name");
1882 strncpy(newstr,name,8);
1888 /* Just compares the short names (first 8 chars) */
1889 static COFF_section *
1890 findPEi386SectionCalled ( ObjectCode* oc, char* name )
1894 = (COFF_header*)(oc->image);
1895 COFF_section* sectab
1897 ((UChar*)(oc->image))
1898 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
1900 for (i = 0; i < hdr->NumberOfSections; i++) {
1903 COFF_section* section_i
1905 myindex ( sizeof_COFF_section, sectab, i );
1906 n1 = (UChar*) &(section_i->Name);
1908 if (n1[0]==n2[0] && n1[1]==n2[1] && n1[2]==n2[2] &&
1909 n1[3]==n2[3] && n1[4]==n2[4] && n1[5]==n2[5] &&
1910 n1[6]==n2[6] && n1[7]==n2[7])
1919 zapTrailingAtSign ( UChar* sym )
1921 # define my_isdigit(c) ((c) >= '0' && (c) <= '9')
1923 if (sym[0] == 0) return;
1925 while (sym[i] != 0) i++;
1928 while (j > 0 && my_isdigit(sym[j])) j--;
1929 if (j > 0 && sym[j] == '@' && j != i) sym[j] = 0;
1935 ocVerifyImage_PEi386 ( ObjectCode* oc )
1940 COFF_section* sectab;
1941 COFF_symbol* symtab;
1943 /* debugBelch("\nLOADING %s\n", oc->fileName); */
1944 hdr = (COFF_header*)(oc->image);
1945 sectab = (COFF_section*) (
1946 ((UChar*)(oc->image))
1947 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
1949 symtab = (COFF_symbol*) (
1950 ((UChar*)(oc->image))
1951 + hdr->PointerToSymbolTable
1953 strtab = ((UChar*)symtab)
1954 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
1956 if (hdr->Machine != 0x14c) {
1957 errorBelch("%s: Not x86 PEi386", oc->fileName);
1960 if (hdr->SizeOfOptionalHeader != 0) {
1961 errorBelch("%s: PEi386 with nonempty optional header", oc->fileName);
1964 if ( /* (hdr->Characteristics & MYIMAGE_FILE_RELOCS_STRIPPED) || */
1965 (hdr->Characteristics & MYIMAGE_FILE_EXECUTABLE_IMAGE) ||
1966 (hdr->Characteristics & MYIMAGE_FILE_DLL) ||
1967 (hdr->Characteristics & MYIMAGE_FILE_SYSTEM) ) {
1968 errorBelch("%s: Not a PEi386 object file", oc->fileName);
1971 if ( (hdr->Characteristics & MYIMAGE_FILE_BYTES_REVERSED_HI)
1972 /* || !(hdr->Characteristics & MYIMAGE_FILE_32BIT_MACHINE) */ ) {
1973 errorBelch("%s: Invalid PEi386 word size or endiannness: %d",
1975 (int)(hdr->Characteristics));
1978 /* If the string table size is way crazy, this might indicate that
1979 there are more than 64k relocations, despite claims to the
1980 contrary. Hence this test. */
1981 /* debugBelch("strtab size %d\n", * (UInt32*)strtab); */
1983 if ( (*(UInt32*)strtab) > 600000 ) {
1984 /* Note that 600k has no special significance other than being
1985 big enough to handle the almost-2MB-sized lumps that
1986 constitute HSwin32*.o. */
1987 debugBelch("PEi386 object has suspiciously large string table; > 64k relocs?");
1992 /* No further verification after this point; only debug printing. */
1994 IF_DEBUG(linker, i=1);
1995 if (i == 0) return 1;
1997 debugBelch( "sectab offset = %d\n", ((UChar*)sectab) - ((UChar*)hdr) );
1998 debugBelch( "symtab offset = %d\n", ((UChar*)symtab) - ((UChar*)hdr) );
1999 debugBelch( "strtab offset = %d\n", ((UChar*)strtab) - ((UChar*)hdr) );
2002 debugBelch( "Machine: 0x%x\n", (UInt32)(hdr->Machine) );
2003 debugBelch( "# sections: %d\n", (UInt32)(hdr->NumberOfSections) );
2004 debugBelch( "time/date: 0x%x\n", (UInt32)(hdr->TimeDateStamp) );
2005 debugBelch( "symtab offset: %d\n", (UInt32)(hdr->PointerToSymbolTable) );
2006 debugBelch( "# symbols: %d\n", (UInt32)(hdr->NumberOfSymbols) );
2007 debugBelch( "sz of opt hdr: %d\n", (UInt32)(hdr->SizeOfOptionalHeader) );
2008 debugBelch( "characteristics: 0x%x\n", (UInt32)(hdr->Characteristics) );
2010 /* Print the section table. */
2012 for (i = 0; i < hdr->NumberOfSections; i++) {
2014 COFF_section* sectab_i
2016 myindex ( sizeof_COFF_section, sectab, i );
2023 printName ( sectab_i->Name, strtab );
2033 sectab_i->VirtualSize,
2034 sectab_i->VirtualAddress,
2035 sectab_i->SizeOfRawData,
2036 sectab_i->PointerToRawData,
2037 sectab_i->NumberOfRelocations,
2038 sectab_i->PointerToRelocations,
2039 sectab_i->PointerToRawData
2041 reltab = (COFF_reloc*) (
2042 ((UChar*)(oc->image)) + sectab_i->PointerToRelocations
2045 if ( sectab_i->Characteristics & MYIMAGE_SCN_LNK_NRELOC_OVFL ) {
2046 /* If the relocation field (a short) has overflowed, the
2047 * real count can be found in the first reloc entry.
2049 * See Section 4.1 (last para) of the PE spec (rev6.0).
2051 COFF_reloc* rel = (COFF_reloc*)
2052 myindex ( sizeof_COFF_reloc, reltab, 0 );
2053 noRelocs = rel->VirtualAddress;
2056 noRelocs = sectab_i->NumberOfRelocations;
2060 for (; j < noRelocs; j++) {
2062 COFF_reloc* rel = (COFF_reloc*)
2063 myindex ( sizeof_COFF_reloc, reltab, j );
2065 " type 0x%-4x vaddr 0x%-8x name `",
2067 rel->VirtualAddress );
2068 sym = (COFF_symbol*)
2069 myindex ( sizeof_COFF_symbol, symtab, rel->SymbolTableIndex );
2070 /* Hmm..mysterious looking offset - what's it for? SOF */
2071 printName ( sym->Name, strtab -10 );
2078 debugBelch("string table has size 0x%x\n", * (UInt32*)strtab );
2079 debugBelch("---START of string table---\n");
2080 for (i = 4; i < *(Int32*)strtab; i++) {
2082 debugBelch("\n"); else
2083 debugBelch("%c", strtab[i] );
2085 debugBelch("--- END of string table---\n");
2090 COFF_symbol* symtab_i;
2091 if (i >= (Int32)(hdr->NumberOfSymbols)) break;
2092 symtab_i = (COFF_symbol*)
2093 myindex ( sizeof_COFF_symbol, symtab, i );
2099 printName ( symtab_i->Name, strtab );
2108 (Int32)(symtab_i->SectionNumber),
2109 (UInt32)symtab_i->Type,
2110 (UInt32)symtab_i->StorageClass,
2111 (UInt32)symtab_i->NumberOfAuxSymbols
2113 i += symtab_i->NumberOfAuxSymbols;
2123 ocGetNames_PEi386 ( ObjectCode* oc )
2126 COFF_section* sectab;
2127 COFF_symbol* symtab;
2134 hdr = (COFF_header*)(oc->image);
2135 sectab = (COFF_section*) (
2136 ((UChar*)(oc->image))
2137 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2139 symtab = (COFF_symbol*) (
2140 ((UChar*)(oc->image))
2141 + hdr->PointerToSymbolTable
2143 strtab = ((UChar*)(oc->image))
2144 + hdr->PointerToSymbolTable
2145 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
2147 /* Allocate space for any (local, anonymous) .bss sections. */
2149 for (i = 0; i < hdr->NumberOfSections; i++) {
2152 COFF_section* sectab_i
2154 myindex ( sizeof_COFF_section, sectab, i );
2155 if (0 != strcmp(sectab_i->Name, ".bss")) continue;
2156 /* sof 10/05: the PE spec text isn't too clear regarding what
2157 * the SizeOfRawData field is supposed to hold for object
2158 * file sections containing just uninitialized data -- for executables,
2159 * it is supposed to be zero; unclear what it's supposed to be
2160 * for object files. However, VirtualSize is guaranteed to be
2161 * zero for object files, which definitely suggests that SizeOfRawData
2162 * will be non-zero (where else would the size of this .bss section be
2163 * stored?) Looking at the COFF_section info for incoming object files,
2164 * this certainly appears to be the case.
2166 * => I suspect we've been incorrectly handling .bss sections in (relocatable)
2167 * object files up until now. This turned out to bite us with ghc-6.4.1's use
2168 * of gcc-3.4.x, which has started to emit initially-zeroed-out local 'static'
2169 * variable decls into to the .bss section. (The specific function in Q which
2170 * triggered this is libraries/base/cbits/dirUtils.c:__hscore_getFolderPath())
2172 if (sectab_i->VirtualSize == 0 && sectab_i->SizeOfRawData == 0) continue;
2173 /* This is a non-empty .bss section. Allocate zeroed space for
2174 it, and set its PointerToRawData field such that oc->image +
2175 PointerToRawData == addr_of_zeroed_space. */
2176 bss_sz = sectab_i->VirtualSize;
2177 if ( bss_sz < sectab_i->SizeOfRawData) { bss_sz = sectab_i->SizeOfRawData; }
2178 zspace = stgCallocBytes(1, bss_sz, "ocGetNames_PEi386(anonymous bss)");
2179 sectab_i->PointerToRawData = ((UChar*)zspace) - ((UChar*)(oc->image));
2180 addProddableBlock(oc, zspace, bss_sz);
2181 /* debugBelch("BSS anon section at 0x%x\n", zspace); */
2184 /* Copy section information into the ObjectCode. */
2186 for (i = 0; i < hdr->NumberOfSections; i++) {
2192 = SECTIONKIND_OTHER;
2193 COFF_section* sectab_i
2195 myindex ( sizeof_COFF_section, sectab, i );
2196 IF_DEBUG(linker, debugBelch("section name = %s\n", sectab_i->Name ));
2199 /* I'm sure this is the Right Way to do it. However, the
2200 alternative of testing the sectab_i->Name field seems to
2201 work ok with Cygwin.
2203 if (sectab_i->Characteristics & MYIMAGE_SCN_CNT_CODE ||
2204 sectab_i->Characteristics & MYIMAGE_SCN_CNT_INITIALIZED_DATA)
2205 kind = SECTIONKIND_CODE_OR_RODATA;
2208 if (0==strcmp(".text",sectab_i->Name) ||
2209 0==strcmp(".rdata",sectab_i->Name)||
2210 0==strcmp(".rodata",sectab_i->Name))
2211 kind = SECTIONKIND_CODE_OR_RODATA;
2212 if (0==strcmp(".data",sectab_i->Name) ||
2213 0==strcmp(".bss",sectab_i->Name))
2214 kind = SECTIONKIND_RWDATA;
2216 ASSERT(sectab_i->SizeOfRawData == 0 || sectab_i->VirtualSize == 0);
2217 sz = sectab_i->SizeOfRawData;
2218 if (sz < sectab_i->VirtualSize) sz = sectab_i->VirtualSize;
2220 start = ((UChar*)(oc->image)) + sectab_i->PointerToRawData;
2221 end = start + sz - 1;
2223 if (kind == SECTIONKIND_OTHER
2224 /* Ignore sections called which contain stabs debugging
2226 && 0 != strcmp(".stab", sectab_i->Name)
2227 && 0 != strcmp(".stabstr", sectab_i->Name)
2228 /* ignore constructor section for now */
2229 && 0 != strcmp(".ctors", sectab_i->Name)
2230 /* ignore section generated from .ident */
2231 && 0!= strcmp("/4", sectab_i->Name)
2233 errorBelch("Unknown PEi386 section name `%s' (while processing: %s)", sectab_i->Name, oc->fileName);
2237 if (kind != SECTIONKIND_OTHER && end >= start) {
2238 addSection(oc, kind, start, end);
2239 addProddableBlock(oc, start, end - start + 1);
2243 /* Copy exported symbols into the ObjectCode. */
2245 oc->n_symbols = hdr->NumberOfSymbols;
2246 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
2247 "ocGetNames_PEi386(oc->symbols)");
2248 /* Call me paranoid; I don't care. */
2249 for (i = 0; i < oc->n_symbols; i++)
2250 oc->symbols[i] = NULL;
2254 COFF_symbol* symtab_i;
2255 if (i >= (Int32)(hdr->NumberOfSymbols)) break;
2256 symtab_i = (COFF_symbol*)
2257 myindex ( sizeof_COFF_symbol, symtab, i );
2261 if (symtab_i->StorageClass == MYIMAGE_SYM_CLASS_EXTERNAL
2262 && symtab_i->SectionNumber != MYIMAGE_SYM_UNDEFINED) {
2263 /* This symbol is global and defined, viz, exported */
2264 /* for MYIMAGE_SYMCLASS_EXTERNAL
2265 && !MYIMAGE_SYM_UNDEFINED,
2266 the address of the symbol is:
2267 address of relevant section + offset in section
2269 COFF_section* sectabent
2270 = (COFF_section*) myindex ( sizeof_COFF_section,
2272 symtab_i->SectionNumber-1 );
2273 addr = ((UChar*)(oc->image))
2274 + (sectabent->PointerToRawData
2278 if (symtab_i->SectionNumber == MYIMAGE_SYM_UNDEFINED
2279 && symtab_i->Value > 0) {
2280 /* This symbol isn't in any section at all, ie, global bss.
2281 Allocate zeroed space for it. */
2282 addr = stgCallocBytes(1, symtab_i->Value,
2283 "ocGetNames_PEi386(non-anonymous bss)");
2284 addSection(oc, SECTIONKIND_RWDATA, addr,
2285 ((UChar*)addr) + symtab_i->Value - 1);
2286 addProddableBlock(oc, addr, symtab_i->Value);
2287 /* debugBelch("BSS section at 0x%x\n", addr); */
2290 if (addr != NULL ) {
2291 sname = cstring_from_COFF_symbol_name ( symtab_i->Name, strtab );
2292 /* debugBelch("addSymbol %p `%s \n", addr,sname); */
2293 IF_DEBUG(linker, debugBelch("addSymbol %p `%s'\n", addr,sname);)
2294 ASSERT(i >= 0 && i < oc->n_symbols);
2295 /* cstring_from_COFF_symbol_name always succeeds. */
2296 oc->symbols[i] = sname;
2297 ghciInsertStrHashTable(oc->fileName, symhash, sname, addr);
2301 "IGNORING symbol %d\n"
2305 printName ( symtab_i->Name, strtab );
2314 (Int32)(symtab_i->SectionNumber),
2315 (UInt32)symtab_i->Type,
2316 (UInt32)symtab_i->StorageClass,
2317 (UInt32)symtab_i->NumberOfAuxSymbols
2322 i += symtab_i->NumberOfAuxSymbols;
2331 ocResolve_PEi386 ( ObjectCode* oc )
2334 COFF_section* sectab;
2335 COFF_symbol* symtab;
2345 /* ToDo: should be variable-sized? But is at least safe in the
2346 sense of buffer-overrun-proof. */
2348 /* debugBelch("resolving for %s\n", oc->fileName); */
2350 hdr = (COFF_header*)(oc->image);
2351 sectab = (COFF_section*) (
2352 ((UChar*)(oc->image))
2353 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2355 symtab = (COFF_symbol*) (
2356 ((UChar*)(oc->image))
2357 + hdr->PointerToSymbolTable
2359 strtab = ((UChar*)(oc->image))
2360 + hdr->PointerToSymbolTable
2361 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
2363 for (i = 0; i < hdr->NumberOfSections; i++) {
2364 COFF_section* sectab_i
2366 myindex ( sizeof_COFF_section, sectab, i );
2369 ((UChar*)(oc->image)) + sectab_i->PointerToRelocations
2372 /* Ignore sections called which contain stabs debugging
2374 if (0 == strcmp(".stab", sectab_i->Name)
2375 || 0 == strcmp(".stabstr", sectab_i->Name)
2376 || 0 == strcmp(".ctors", sectab_i->Name))
2379 if ( sectab_i->Characteristics & MYIMAGE_SCN_LNK_NRELOC_OVFL ) {
2380 /* If the relocation field (a short) has overflowed, the
2381 * real count can be found in the first reloc entry.
2383 * See Section 4.1 (last para) of the PE spec (rev6.0).
2385 * Nov2003 update: the GNU linker still doesn't correctly
2386 * handle the generation of relocatable object files with
2387 * overflown relocations. Hence the output to warn of potential
2390 COFF_reloc* rel = (COFF_reloc*)
2391 myindex ( sizeof_COFF_reloc, reltab, 0 );
2392 noRelocs = rel->VirtualAddress;
2394 /* 10/05: we now assume (and check for) a GNU ld that is capable
2395 * of handling object files with (>2^16) of relocs.
2398 debugBelch("WARNING: Overflown relocation field (# relocs found: %u)\n",
2403 noRelocs = sectab_i->NumberOfRelocations;
2408 for (; j < noRelocs; j++) {
2410 COFF_reloc* reltab_j
2412 myindex ( sizeof_COFF_reloc, reltab, j );
2414 /* the location to patch */
2416 ((UChar*)(oc->image))
2417 + (sectab_i->PointerToRawData
2418 + reltab_j->VirtualAddress
2419 - sectab_i->VirtualAddress )
2421 /* the existing contents of pP */
2423 /* the symbol to connect to */
2424 sym = (COFF_symbol*)
2425 myindex ( sizeof_COFF_symbol,
2426 symtab, reltab_j->SymbolTableIndex );
2429 "reloc sec %2d num %3d: type 0x%-4x "
2430 "vaddr 0x%-8x name `",
2432 (UInt32)reltab_j->Type,
2433 reltab_j->VirtualAddress );
2434 printName ( sym->Name, strtab );
2435 debugBelch("'\n" ));
2437 if (sym->StorageClass == MYIMAGE_SYM_CLASS_STATIC) {
2438 COFF_section* section_sym
2439 = findPEi386SectionCalled ( oc, sym->Name );
2441 errorBelch("%s: can't find section `%s'", oc->fileName, sym->Name);
2444 S = ((UInt32)(oc->image))
2445 + (section_sym->PointerToRawData
2448 copyName ( sym->Name, strtab, symbol, 1000-1 );
2449 S = (UInt32) lookupLocalSymbol( oc, symbol );
2450 if ((void*)S != NULL) goto foundit;
2451 S = (UInt32) lookupSymbol( symbol );
2452 if ((void*)S != NULL) goto foundit;
2453 zapTrailingAtSign ( symbol );
2454 S = (UInt32) lookupLocalSymbol( oc, symbol );
2455 if ((void*)S != NULL) goto foundit;
2456 S = (UInt32) lookupSymbol( symbol );
2457 if ((void*)S != NULL) goto foundit;
2458 /* Newline first because the interactive linker has printed "linking..." */
2459 errorBelch("\n%s: unknown symbol `%s'", oc->fileName, symbol);
2463 checkProddableBlock(oc, pP);
2464 switch (reltab_j->Type) {
2465 case MYIMAGE_REL_I386_DIR32:
2468 case MYIMAGE_REL_I386_REL32:
2469 /* Tricky. We have to insert a displacement at
2470 pP which, when added to the PC for the _next_
2471 insn, gives the address of the target (S).
2472 Problem is to know the address of the next insn
2473 when we only know pP. We assume that this
2474 literal field is always the last in the insn,
2475 so that the address of the next insn is pP+4
2476 -- hence the constant 4.
2477 Also I don't know if A should be added, but so
2478 far it has always been zero.
2480 SOF 05/2005: 'A' (old contents of *pP) have been observed
2481 to contain values other than zero (the 'wx' object file
2482 that came with wxhaskell-0.9.4; dunno how it was compiled..).
2483 So, add displacement to old value instead of asserting
2484 A to be zero. Fixes wxhaskell-related crashes, and no other
2485 ill effects have been observed.
2487 Update: the reason why we're seeing these more elaborate
2488 relocations is due to a switch in how the NCG compiles SRTs
2489 and offsets to them from info tables. SRTs live in .(ro)data,
2490 while info tables live in .text, causing GAS to emit REL32/DISP32
2491 relocations with non-zero values. Adding the displacement is
2492 the right thing to do.
2494 *pP = S - ((UInt32)pP) - 4 + A;
2497 debugBelch("%s: unhandled PEi386 relocation type %d",
2498 oc->fileName, reltab_j->Type);
2505 IF_DEBUG(linker, debugBelch("completed %s", oc->fileName));
2509 #endif /* defined(OBJFORMAT_PEi386) */
2512 /* --------------------------------------------------------------------------
2514 * ------------------------------------------------------------------------*/
2516 #if defined(OBJFORMAT_ELF)
2521 #if defined(sparc_HOST_ARCH)
2522 # define ELF_TARGET_SPARC /* Used inside <elf.h> */
2523 #elif defined(i386_HOST_ARCH)
2524 # define ELF_TARGET_386 /* Used inside <elf.h> */
2525 #elif defined(x86_64_HOST_ARCH)
2526 # define ELF_TARGET_X64_64
2528 #elif defined (ia64_HOST_ARCH)
2529 # define ELF_TARGET_IA64 /* Used inside <elf.h> */
2531 # define ELF_FUNCTION_DESC /* calling convention uses function descriptors */
2532 # define ELF_NEED_GOT /* needs Global Offset Table */
2533 # define ELF_NEED_PLT /* needs Procedure Linkage Tables */
2536 #if !defined(openbsd_HOST_OS)
2539 /* openbsd elf has things in different places, with diff names */
2540 #include <elf_abi.h>
2541 #include <machine/reloc.h>
2542 #define R_386_32 RELOC_32
2543 #define R_386_PC32 RELOC_PC32
2547 * Define a set of types which can be used for both ELF32 and ELF64
2551 #define ELFCLASS ELFCLASS64
2552 #define Elf_Addr Elf64_Addr
2553 #define Elf_Word Elf64_Word
2554 #define Elf_Sword Elf64_Sword
2555 #define Elf_Ehdr Elf64_Ehdr
2556 #define Elf_Phdr Elf64_Phdr
2557 #define Elf_Shdr Elf64_Shdr
2558 #define Elf_Sym Elf64_Sym
2559 #define Elf_Rel Elf64_Rel
2560 #define Elf_Rela Elf64_Rela
2561 #define ELF_ST_TYPE ELF64_ST_TYPE
2562 #define ELF_ST_BIND ELF64_ST_BIND
2563 #define ELF_R_TYPE ELF64_R_TYPE
2564 #define ELF_R_SYM ELF64_R_SYM
2566 #define ELFCLASS ELFCLASS32
2567 #define Elf_Addr Elf32_Addr
2568 #define Elf_Word Elf32_Word
2569 #define Elf_Sword Elf32_Sword
2570 #define Elf_Ehdr Elf32_Ehdr
2571 #define Elf_Phdr Elf32_Phdr
2572 #define Elf_Shdr Elf32_Shdr
2573 #define Elf_Sym Elf32_Sym
2574 #define Elf_Rel Elf32_Rel
2575 #define Elf_Rela Elf32_Rela
2577 #define ELF_ST_TYPE ELF32_ST_TYPE
2580 #define ELF_ST_BIND ELF32_ST_BIND
2583 #define ELF_R_TYPE ELF32_R_TYPE
2586 #define ELF_R_SYM ELF32_R_SYM
2592 * Functions to allocate entries in dynamic sections. Currently we simply
2593 * preallocate a large number, and we don't check if a entry for the given
2594 * target already exists (a linear search is too slow). Ideally these
2595 * entries would be associated with symbols.
2598 /* These sizes sufficient to load HSbase + HShaskell98 + a few modules */
2599 #define GOT_SIZE 0x20000
2600 #define FUNCTION_TABLE_SIZE 0x10000
2601 #define PLT_SIZE 0x08000
2604 static Elf_Addr got[GOT_SIZE];
2605 static unsigned int gotIndex;
2606 static Elf_Addr gp_val = (Elf_Addr)got;
2609 allocateGOTEntry(Elf_Addr target)
2613 if (gotIndex >= GOT_SIZE)
2614 barf("Global offset table overflow");
2616 entry = &got[gotIndex++];
2618 return (Elf_Addr)entry;
2622 #ifdef ELF_FUNCTION_DESC
2628 static FunctionDesc functionTable[FUNCTION_TABLE_SIZE];
2629 static unsigned int functionTableIndex;
2632 allocateFunctionDesc(Elf_Addr target)
2634 FunctionDesc *entry;
2636 if (functionTableIndex >= FUNCTION_TABLE_SIZE)
2637 barf("Function table overflow");
2639 entry = &functionTable[functionTableIndex++];
2641 entry->gp = (Elf_Addr)gp_val;
2642 return (Elf_Addr)entry;
2646 copyFunctionDesc(Elf_Addr target)
2648 FunctionDesc *olddesc = (FunctionDesc *)target;
2649 FunctionDesc *newdesc;
2651 newdesc = (FunctionDesc *)allocateFunctionDesc(olddesc->ip);
2652 newdesc->gp = olddesc->gp;
2653 return (Elf_Addr)newdesc;
2658 #ifdef ia64_HOST_ARCH
2659 static void ia64_reloc_gprel22(Elf_Addr target, Elf_Addr value);
2660 static void ia64_reloc_pcrel21(Elf_Addr target, Elf_Addr value, ObjectCode *oc);
2662 static unsigned char plt_code[] =
2664 /* taken from binutils bfd/elfxx-ia64.c */
2665 0x0b, 0x78, 0x00, 0x02, 0x00, 0x24, /* [MMI] addl r15=0,r1;; */
2666 0x00, 0x41, 0x3c, 0x30, 0x28, 0xc0, /* ld8 r16=[r15],8 */
2667 0x01, 0x08, 0x00, 0x84, /* mov r14=r1;; */
2668 0x11, 0x08, 0x00, 0x1e, 0x18, 0x10, /* [MIB] ld8 r1=[r15] */
2669 0x60, 0x80, 0x04, 0x80, 0x03, 0x00, /* mov b6=r16 */
2670 0x60, 0x00, 0x80, 0x00 /* br.few b6;; */
2673 /* If we can't get to the function descriptor via gp, take a local copy of it */
2674 #define PLT_RELOC(code, target) { \
2675 Elf64_Sxword rel_value = target - gp_val; \
2676 if ((rel_value > 0x1fffff) || (rel_value < -0x1fffff)) \
2677 ia64_reloc_gprel22((Elf_Addr)code, copyFunctionDesc(target)); \
2679 ia64_reloc_gprel22((Elf_Addr)code, target); \
2684 unsigned char code[sizeof(plt_code)];
2688 allocatePLTEntry(Elf_Addr target, ObjectCode *oc)
2690 PLTEntry *plt = (PLTEntry *)oc->plt;
2693 if (oc->pltIndex >= PLT_SIZE)
2694 barf("Procedure table overflow");
2696 entry = &plt[oc->pltIndex++];
2697 memcpy(entry->code, plt_code, sizeof(entry->code));
2698 PLT_RELOC(entry->code, target);
2699 return (Elf_Addr)entry;
2705 return (PLT_SIZE * sizeof(PLTEntry));
2710 #if x86_64_HOST_ARCH
2711 // On x86_64, 32-bit relocations are often used, which requires that
2712 // we can resolve a symbol to a 32-bit offset. However, shared
2713 // libraries are placed outside the 2Gb area, which leaves us with a
2714 // problem when we need to give a 32-bit offset to a symbol in a
2717 // For a function symbol, we can allocate a bounce sequence inside the
2718 // 2Gb area and resolve the symbol to this. The bounce sequence is
2719 // simply a long jump instruction to the real location of the symbol.
2721 // For data references, we're screwed.
2724 unsigned char jmp[8]; /* 6 byte instruction: jmpq *0x00000002(%rip) */
2728 #define X86_64_BB_SIZE 1024
2730 static x86_64_bounce *x86_64_bounce_buffer = NULL;
2731 static nat x86_64_bb_next_off;
2734 x86_64_high_symbol( char *lbl, void *addr )
2736 x86_64_bounce *bounce;
2738 if ( x86_64_bounce_buffer == NULL ||
2739 x86_64_bb_next_off >= X86_64_BB_SIZE ) {
2740 x86_64_bounce_buffer =
2741 mmap(NULL, X86_64_BB_SIZE * sizeof(x86_64_bounce),
2742 PROT_EXEC|PROT_READ|PROT_WRITE,
2743 MAP_PRIVATE|MAP_32BIT|MAP_ANONYMOUS, -1, 0);
2744 if (x86_64_bounce_buffer == MAP_FAILED) {
2745 barf("x86_64_high_symbol: mmap failed");
2747 x86_64_bb_next_off = 0;
2749 bounce = &x86_64_bounce_buffer[x86_64_bb_next_off];
2750 bounce->jmp[0] = 0xff;
2751 bounce->jmp[1] = 0x25;
2752 bounce->jmp[2] = 0x02;
2753 bounce->jmp[3] = 0x00;
2754 bounce->jmp[4] = 0x00;
2755 bounce->jmp[5] = 0x00;
2756 bounce->addr = addr;
2757 x86_64_bb_next_off++;
2759 IF_DEBUG(linker, debugBelch("x86_64: allocated bounce entry for %s->%p at %p\n",
2760 lbl, addr, bounce));
2762 insertStrHashTable(symhash, lbl, bounce);
2769 * Generic ELF functions
2773 findElfSection ( void* objImage, Elf_Word sh_type )
2775 char* ehdrC = (char*)objImage;
2776 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2777 Elf_Shdr* shdr = (Elf_Shdr*)(ehdrC + ehdr->e_shoff);
2778 char* sh_strtab = ehdrC + shdr[ehdr->e_shstrndx].sh_offset;
2782 for (i = 0; i < ehdr->e_shnum; i++) {
2783 if (shdr[i].sh_type == sh_type
2784 /* Ignore the section header's string table. */
2785 && i != ehdr->e_shstrndx
2786 /* Ignore string tables named .stabstr, as they contain
2788 && 0 != memcmp(".stabstr", sh_strtab + shdr[i].sh_name, 8)
2790 ptr = ehdrC + shdr[i].sh_offset;
2797 #if defined(ia64_HOST_ARCH)
2799 findElfSegment ( void* objImage, Elf_Addr vaddr )
2801 char* ehdrC = (char*)objImage;
2802 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2803 Elf_Phdr* phdr = (Elf_Phdr*)(ehdrC + ehdr->e_phoff);
2804 Elf_Addr segaddr = 0;
2807 for (i = 0; i < ehdr->e_phnum; i++) {
2808 segaddr = phdr[i].p_vaddr;
2809 if ((vaddr >= segaddr) && (vaddr < segaddr + phdr[i].p_memsz))
2817 ocVerifyImage_ELF ( ObjectCode* oc )
2821 int i, j, nent, nstrtab, nsymtabs;
2825 char* ehdrC = (char*)(oc->image);
2826 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2828 if (ehdr->e_ident[EI_MAG0] != ELFMAG0 ||
2829 ehdr->e_ident[EI_MAG1] != ELFMAG1 ||
2830 ehdr->e_ident[EI_MAG2] != ELFMAG2 ||
2831 ehdr->e_ident[EI_MAG3] != ELFMAG3) {
2832 errorBelch("%s: not an ELF object", oc->fileName);
2836 if (ehdr->e_ident[EI_CLASS] != ELFCLASS) {
2837 errorBelch("%s: unsupported ELF format", oc->fileName);
2841 if (ehdr->e_ident[EI_DATA] == ELFDATA2LSB) {
2842 IF_DEBUG(linker,debugBelch( "Is little-endian\n" ));
2844 if (ehdr->e_ident[EI_DATA] == ELFDATA2MSB) {
2845 IF_DEBUG(linker,debugBelch( "Is big-endian\n" ));
2847 errorBelch("%s: unknown endiannness", oc->fileName);
2851 if (ehdr->e_type != ET_REL) {
2852 errorBelch("%s: not a relocatable object (.o) file", oc->fileName);
2855 IF_DEBUG(linker, debugBelch( "Is a relocatable object (.o) file\n" ));
2857 IF_DEBUG(linker,debugBelch( "Architecture is " ));
2858 switch (ehdr->e_machine) {
2859 case EM_386: IF_DEBUG(linker,debugBelch( "x86" )); break;
2860 #ifdef EM_SPARC32PLUS
2861 case EM_SPARC32PLUS:
2863 case EM_SPARC: IF_DEBUG(linker,debugBelch( "sparc" )); break;
2865 case EM_IA_64: IF_DEBUG(linker,debugBelch( "ia64" )); break;
2867 case EM_PPC: IF_DEBUG(linker,debugBelch( "powerpc32" )); break;
2869 case EM_X86_64: IF_DEBUG(linker,debugBelch( "x86_64" )); break;
2871 default: IF_DEBUG(linker,debugBelch( "unknown" ));
2872 errorBelch("%s: unknown architecture", oc->fileName);
2876 IF_DEBUG(linker,debugBelch(
2877 "\nSection header table: start %ld, n_entries %d, ent_size %d\n",
2878 (long)ehdr->e_shoff, ehdr->e_shnum, ehdr->e_shentsize ));
2880 ASSERT (ehdr->e_shentsize == sizeof(Elf_Shdr));
2882 shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
2884 if (ehdr->e_shstrndx == SHN_UNDEF) {
2885 errorBelch("%s: no section header string table", oc->fileName);
2888 IF_DEBUG(linker,debugBelch( "Section header string table is section %d\n",
2890 sh_strtab = ehdrC + shdr[ehdr->e_shstrndx].sh_offset;
2893 for (i = 0; i < ehdr->e_shnum; i++) {
2894 IF_DEBUG(linker,debugBelch("%2d: ", i ));
2895 IF_DEBUG(linker,debugBelch("type=%2d ", (int)shdr[i].sh_type ));
2896 IF_DEBUG(linker,debugBelch("size=%4d ", (int)shdr[i].sh_size ));
2897 IF_DEBUG(linker,debugBelch("offs=%4d ", (int)shdr[i].sh_offset ));
2898 IF_DEBUG(linker,debugBelch(" (%p .. %p) ",
2899 ehdrC + shdr[i].sh_offset,
2900 ehdrC + shdr[i].sh_offset + shdr[i].sh_size - 1));
2902 if (shdr[i].sh_type == SHT_REL) {
2903 IF_DEBUG(linker,debugBelch("Rel " ));
2904 } else if (shdr[i].sh_type == SHT_RELA) {
2905 IF_DEBUG(linker,debugBelch("RelA " ));
2907 IF_DEBUG(linker,debugBelch(" "));
2910 IF_DEBUG(linker,debugBelch("sname=%s\n", sh_strtab + shdr[i].sh_name ));
2914 IF_DEBUG(linker,debugBelch( "\nString tables" ));
2917 for (i = 0; i < ehdr->e_shnum; i++) {
2918 if (shdr[i].sh_type == SHT_STRTAB
2919 /* Ignore the section header's string table. */
2920 && i != ehdr->e_shstrndx
2921 /* Ignore string tables named .stabstr, as they contain
2923 && 0 != memcmp(".stabstr", sh_strtab + shdr[i].sh_name, 8)
2925 IF_DEBUG(linker,debugBelch(" section %d is a normal string table", i ));
2926 strtab = ehdrC + shdr[i].sh_offset;
2931 errorBelch("%s: no string tables, or too many", oc->fileName);
2936 IF_DEBUG(linker,debugBelch( "\nSymbol tables" ));
2937 for (i = 0; i < ehdr->e_shnum; i++) {
2938 if (shdr[i].sh_type != SHT_SYMTAB) continue;
2939 IF_DEBUG(linker,debugBelch( "section %d is a symbol table\n", i ));
2941 stab = (Elf_Sym*) (ehdrC + shdr[i].sh_offset);
2942 nent = shdr[i].sh_size / sizeof(Elf_Sym);
2943 IF_DEBUG(linker,debugBelch( " number of entries is apparently %d (%ld rem)\n",
2945 (long)shdr[i].sh_size % sizeof(Elf_Sym)
2947 if (0 != shdr[i].sh_size % sizeof(Elf_Sym)) {
2948 errorBelch("%s: non-integral number of symbol table entries", oc->fileName);
2951 for (j = 0; j < nent; j++) {
2952 IF_DEBUG(linker,debugBelch(" %2d ", j ));
2953 IF_DEBUG(linker,debugBelch(" sec=%-5d size=%-3d val=%5p ",
2954 (int)stab[j].st_shndx,
2955 (int)stab[j].st_size,
2956 (char*)stab[j].st_value ));
2958 IF_DEBUG(linker,debugBelch("type=" ));
2959 switch (ELF_ST_TYPE(stab[j].st_info)) {
2960 case STT_NOTYPE: IF_DEBUG(linker,debugBelch("notype " )); break;
2961 case STT_OBJECT: IF_DEBUG(linker,debugBelch("object " )); break;
2962 case STT_FUNC : IF_DEBUG(linker,debugBelch("func " )); break;
2963 case STT_SECTION: IF_DEBUG(linker,debugBelch("section" )); break;
2964 case STT_FILE: IF_DEBUG(linker,debugBelch("file " )); break;
2965 default: IF_DEBUG(linker,debugBelch("? " )); break;
2967 IF_DEBUG(linker,debugBelch(" " ));
2969 IF_DEBUG(linker,debugBelch("bind=" ));
2970 switch (ELF_ST_BIND(stab[j].st_info)) {
2971 case STB_LOCAL : IF_DEBUG(linker,debugBelch("local " )); break;
2972 case STB_GLOBAL: IF_DEBUG(linker,debugBelch("global" )); break;
2973 case STB_WEAK : IF_DEBUG(linker,debugBelch("weak " )); break;
2974 default: IF_DEBUG(linker,debugBelch("? " )); break;
2976 IF_DEBUG(linker,debugBelch(" " ));
2978 IF_DEBUG(linker,debugBelch("name=%s\n", strtab + stab[j].st_name ));
2982 if (nsymtabs == 0) {
2983 errorBelch("%s: didn't find any symbol tables", oc->fileName);
2990 static int getSectionKind_ELF( Elf_Shdr *hdr, int *is_bss )
2994 if (hdr->sh_type == SHT_PROGBITS
2995 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_EXECINSTR)) {
2996 /* .text-style section */
2997 return SECTIONKIND_CODE_OR_RODATA;
3000 if (hdr->sh_type == SHT_PROGBITS
3001 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_WRITE)) {
3002 /* .data-style section */
3003 return SECTIONKIND_RWDATA;
3006 if (hdr->sh_type == SHT_PROGBITS
3007 && (hdr->sh_flags & SHF_ALLOC) && !(hdr->sh_flags & SHF_WRITE)) {
3008 /* .rodata-style section */
3009 return SECTIONKIND_CODE_OR_RODATA;
3012 if (hdr->sh_type == SHT_NOBITS
3013 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_WRITE)) {
3014 /* .bss-style section */
3016 return SECTIONKIND_RWDATA;
3019 return SECTIONKIND_OTHER;
3024 ocGetNames_ELF ( ObjectCode* oc )
3029 char* ehdrC = (char*)(oc->image);
3030 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
3031 char* strtab = findElfSection ( ehdrC, SHT_STRTAB );
3032 Elf_Shdr* shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
3034 ASSERT(symhash != NULL);
3037 errorBelch("%s: no strtab", oc->fileName);
3042 for (i = 0; i < ehdr->e_shnum; i++) {
3043 /* Figure out what kind of section it is. Logic derived from
3044 Figure 1.14 ("Special Sections") of the ELF document
3045 ("Portable Formats Specification, Version 1.1"). */
3047 SectionKind kind = getSectionKind_ELF(&shdr[i], &is_bss);
3049 if (is_bss && shdr[i].sh_size > 0) {
3050 /* This is a non-empty .bss section. Allocate zeroed space for
3051 it, and set its .sh_offset field such that
3052 ehdrC + .sh_offset == addr_of_zeroed_space. */
3053 char* zspace = stgCallocBytes(1, shdr[i].sh_size,
3054 "ocGetNames_ELF(BSS)");
3055 shdr[i].sh_offset = ((char*)zspace) - ((char*)ehdrC);
3057 debugBelch("BSS section at 0x%x, size %d\n",
3058 zspace, shdr[i].sh_size);
3062 /* fill in the section info */
3063 if (kind != SECTIONKIND_OTHER && shdr[i].sh_size > 0) {
3064 addProddableBlock(oc, ehdrC + shdr[i].sh_offset, shdr[i].sh_size);
3065 addSection(oc, kind, ehdrC + shdr[i].sh_offset,
3066 ehdrC + shdr[i].sh_offset + shdr[i].sh_size - 1);
3069 if (shdr[i].sh_type != SHT_SYMTAB) continue;
3071 /* copy stuff into this module's object symbol table */
3072 stab = (Elf_Sym*) (ehdrC + shdr[i].sh_offset);
3073 nent = shdr[i].sh_size / sizeof(Elf_Sym);
3075 oc->n_symbols = nent;
3076 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
3077 "ocGetNames_ELF(oc->symbols)");
3079 for (j = 0; j < nent; j++) {
3081 char isLocal = FALSE; /* avoids uninit-var warning */
3083 char* nm = strtab + stab[j].st_name;
3084 int secno = stab[j].st_shndx;
3086 /* Figure out if we want to add it; if so, set ad to its
3087 address. Otherwise leave ad == NULL. */
3089 if (secno == SHN_COMMON) {
3091 ad = stgCallocBytes(1, stab[j].st_size, "ocGetNames_ELF(COMMON)");
3093 debugBelch("COMMON symbol, size %d name %s\n",
3094 stab[j].st_size, nm);
3096 /* Pointless to do addProddableBlock() for this area,
3097 since the linker should never poke around in it. */
3100 if ( ( ELF_ST_BIND(stab[j].st_info)==STB_GLOBAL
3101 || ELF_ST_BIND(stab[j].st_info)==STB_LOCAL
3103 /* and not an undefined symbol */
3104 && stab[j].st_shndx != SHN_UNDEF
3105 /* and not in a "special section" */
3106 && stab[j].st_shndx < SHN_LORESERVE
3108 /* and it's a not a section or string table or anything silly */
3109 ( ELF_ST_TYPE(stab[j].st_info)==STT_FUNC ||
3110 ELF_ST_TYPE(stab[j].st_info)==STT_OBJECT ||
3111 ELF_ST_TYPE(stab[j].st_info)==STT_NOTYPE
3114 /* Section 0 is the undefined section, hence > and not >=. */
3115 ASSERT(secno > 0 && secno < ehdr->e_shnum);
3117 if (shdr[secno].sh_type == SHT_NOBITS) {
3118 debugBelch(" BSS symbol, size %d off %d name %s\n",
3119 stab[j].st_size, stab[j].st_value, nm);
3122 ad = ehdrC + shdr[ secno ].sh_offset + stab[j].st_value;
3123 if (ELF_ST_BIND(stab[j].st_info)==STB_LOCAL) {
3126 #ifdef ELF_FUNCTION_DESC
3127 /* dlsym() and the initialisation table both give us function
3128 * descriptors, so to be consistent we store function descriptors
3129 * in the symbol table */
3130 if (ELF_ST_TYPE(stab[j].st_info) == STT_FUNC)
3131 ad = (char *)allocateFunctionDesc((Elf_Addr)ad);
3133 IF_DEBUG(linker,debugBelch( "addOTabName(GLOB): %10p %s %s",
3134 ad, oc->fileName, nm ));
3139 /* And the decision is ... */
3143 oc->symbols[j] = nm;
3146 /* Ignore entirely. */
3148 ghciInsertStrHashTable(oc->fileName, symhash, nm, ad);
3152 IF_DEBUG(linker,debugBelch( "skipping `%s'\n",
3153 strtab + stab[j].st_name ));
3156 "skipping bind = %d, type = %d, shndx = %d `%s'\n",
3157 (int)ELF_ST_BIND(stab[j].st_info),
3158 (int)ELF_ST_TYPE(stab[j].st_info),
3159 (int)stab[j].st_shndx,
3160 strtab + stab[j].st_name
3163 oc->symbols[j] = NULL;
3172 /* Do ELF relocations which lack an explicit addend. All x86-linux
3173 relocations appear to be of this form. */
3175 do_Elf_Rel_relocations ( ObjectCode* oc, char* ehdrC,
3176 Elf_Shdr* shdr, int shnum,
3177 Elf_Sym* stab, char* strtab )
3182 Elf_Rel* rtab = (Elf_Rel*) (ehdrC + shdr[shnum].sh_offset);
3183 int nent = shdr[shnum].sh_size / sizeof(Elf_Rel);
3184 int target_shndx = shdr[shnum].sh_info;
3185 int symtab_shndx = shdr[shnum].sh_link;
3187 stab = (Elf_Sym*) (ehdrC + shdr[ symtab_shndx ].sh_offset);
3188 targ = (Elf_Word*)(ehdrC + shdr[ target_shndx ].sh_offset);
3189 IF_DEBUG(linker,debugBelch( "relocations for section %d using symtab %d\n",
3190 target_shndx, symtab_shndx ));
3192 /* Skip sections that we're not interested in. */
3195 SectionKind kind = getSectionKind_ELF(&shdr[target_shndx], &is_bss);
3196 if (kind == SECTIONKIND_OTHER) {
3197 IF_DEBUG(linker,debugBelch( "skipping (target section not loaded)"));
3202 for (j = 0; j < nent; j++) {
3203 Elf_Addr offset = rtab[j].r_offset;
3204 Elf_Addr info = rtab[j].r_info;
3206 Elf_Addr P = ((Elf_Addr)targ) + offset;
3207 Elf_Word* pP = (Elf_Word*)P;
3212 StgStablePtr stablePtr;
3215 IF_DEBUG(linker,debugBelch( "Rel entry %3d is raw(%6p %6p)",
3216 j, (void*)offset, (void*)info ));
3218 IF_DEBUG(linker,debugBelch( " ZERO" ));
3221 Elf_Sym sym = stab[ELF_R_SYM(info)];
3222 /* First see if it is a local symbol. */
3223 if (ELF_ST_BIND(sym.st_info) == STB_LOCAL) {
3224 /* Yes, so we can get the address directly from the ELF symbol
3226 symbol = sym.st_name==0 ? "(noname)" : strtab+sym.st_name;
3228 (ehdrC + shdr[ sym.st_shndx ].sh_offset
3229 + stab[ELF_R_SYM(info)].st_value);
3232 symbol = strtab + sym.st_name;
3233 stablePtr = (StgStablePtr)lookupHashTable(stablehash, (StgWord)symbol);
3234 if (NULL == stablePtr) {
3235 /* No, so look up the name in our global table. */
3236 S_tmp = lookupSymbol( symbol );
3237 S = (Elf_Addr)S_tmp;
3239 stableVal = deRefStablePtr( stablePtr );
3241 S = (Elf_Addr)S_tmp;
3245 errorBelch("%s: unknown symbol `%s'", oc->fileName, symbol);
3248 IF_DEBUG(linker,debugBelch( "`%s' resolves to %p\n", symbol, (void*)S ));
3251 IF_DEBUG(linker,debugBelch( "Reloc: P = %p S = %p A = %p\n",
3252 (void*)P, (void*)S, (void*)A ));
3253 checkProddableBlock ( oc, pP );
3257 switch (ELF_R_TYPE(info)) {
3258 # ifdef i386_HOST_ARCH
3259 case R_386_32: *pP = value; break;
3260 case R_386_PC32: *pP = value - P; break;
3263 errorBelch("%s: unhandled ELF relocation(Rel) type %lu\n",
3264 oc->fileName, (lnat)ELF_R_TYPE(info));
3272 /* Do ELF relocations for which explicit addends are supplied.
3273 sparc-solaris relocations appear to be of this form. */
3275 do_Elf_Rela_relocations ( ObjectCode* oc, char* ehdrC,
3276 Elf_Shdr* shdr, int shnum,
3277 Elf_Sym* stab, char* strtab )
3280 char *symbol = NULL;
3282 Elf_Rela* rtab = (Elf_Rela*) (ehdrC + shdr[shnum].sh_offset);
3283 int nent = shdr[shnum].sh_size / sizeof(Elf_Rela);
3284 int target_shndx = shdr[shnum].sh_info;
3285 int symtab_shndx = shdr[shnum].sh_link;
3287 stab = (Elf_Sym*) (ehdrC + shdr[ symtab_shndx ].sh_offset);
3288 targ = (Elf_Addr) (ehdrC + shdr[ target_shndx ].sh_offset);
3289 IF_DEBUG(linker,debugBelch( "relocations for section %d using symtab %d\n",
3290 target_shndx, symtab_shndx ));
3292 for (j = 0; j < nent; j++) {
3293 #if defined(DEBUG) || defined(sparc_HOST_ARCH) || defined(ia64_HOST_ARCH) || defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH)
3294 /* This #ifdef only serves to avoid unused-var warnings. */
3295 Elf_Addr offset = rtab[j].r_offset;
3296 Elf_Addr P = targ + offset;
3298 Elf_Addr info = rtab[j].r_info;
3299 Elf_Addr A = rtab[j].r_addend;
3303 # if defined(sparc_HOST_ARCH)
3304 Elf_Word* pP = (Elf_Word*)P;
3306 # elif defined(ia64_HOST_ARCH)
3307 Elf64_Xword *pP = (Elf64_Xword *)P;
3309 # elif defined(powerpc_HOST_ARCH)
3313 IF_DEBUG(linker,debugBelch( "Rel entry %3d is raw(%6p %6p %6p) ",
3314 j, (void*)offset, (void*)info,
3317 IF_DEBUG(linker,debugBelch( " ZERO" ));
3320 Elf_Sym sym = stab[ELF_R_SYM(info)];
3321 /* First see if it is a local symbol. */
3322 if (ELF_ST_BIND(sym.st_info) == STB_LOCAL) {
3323 /* Yes, so we can get the address directly from the ELF symbol
3325 symbol = sym.st_name==0 ? "(noname)" : strtab+sym.st_name;
3327 (ehdrC + shdr[ sym.st_shndx ].sh_offset
3328 + stab[ELF_R_SYM(info)].st_value);
3329 #ifdef ELF_FUNCTION_DESC
3330 /* Make a function descriptor for this function */
3331 if (S && ELF_ST_TYPE(sym.st_info) == STT_FUNC) {
3332 S = allocateFunctionDesc(S + A);
3337 /* No, so look up the name in our global table. */
3338 symbol = strtab + sym.st_name;
3339 S_tmp = lookupSymbol( symbol );
3340 S = (Elf_Addr)S_tmp;
3342 #ifdef ELF_FUNCTION_DESC
3343 /* If a function, already a function descriptor - we would
3344 have to copy it to add an offset. */
3345 if (S && (ELF_ST_TYPE(sym.st_info) == STT_FUNC) && (A != 0))
3346 errorBelch("%s: function %s with addend %p", oc->fileName, symbol, (void *)A);
3350 errorBelch("%s: unknown symbol `%s'", oc->fileName, symbol);
3353 IF_DEBUG(linker,debugBelch( "`%s' resolves to %p", symbol, (void*)S ));
3356 IF_DEBUG(linker,debugBelch("Reloc: P = %p S = %p A = %p\n",
3357 (void*)P, (void*)S, (void*)A ));
3358 /* checkProddableBlock ( oc, (void*)P ); */
3362 switch (ELF_R_TYPE(info)) {
3363 # if defined(sparc_HOST_ARCH)
3364 case R_SPARC_WDISP30:
3365 w1 = *pP & 0xC0000000;
3366 w2 = (Elf_Word)((value - P) >> 2);
3367 ASSERT((w2 & 0xC0000000) == 0);
3372 w1 = *pP & 0xFFC00000;
3373 w2 = (Elf_Word)(value >> 10);
3374 ASSERT((w2 & 0xFFC00000) == 0);
3380 w2 = (Elf_Word)(value & 0x3FF);
3381 ASSERT((w2 & ~0x3FF) == 0);
3385 /* According to the Sun documentation:
3387 This relocation type resembles R_SPARC_32, except it refers to an
3388 unaligned word. That is, the word to be relocated must be treated
3389 as four separate bytes with arbitrary alignment, not as a word
3390 aligned according to the architecture requirements.
3392 (JRS: which means that freeloading on the R_SPARC_32 case
3393 is probably wrong, but hey ...)
3397 w2 = (Elf_Word)value;
3400 # elif defined(ia64_HOST_ARCH)
3401 case R_IA64_DIR64LSB:
3402 case R_IA64_FPTR64LSB:
3405 case R_IA64_PCREL64LSB:
3408 case R_IA64_SEGREL64LSB:
3409 addr = findElfSegment(ehdrC, value);
3412 case R_IA64_GPREL22:
3413 ia64_reloc_gprel22(P, value);
3415 case R_IA64_LTOFF22:
3416 case R_IA64_LTOFF22X:
3417 case R_IA64_LTOFF_FPTR22:
3418 addr = allocateGOTEntry(value);
3419 ia64_reloc_gprel22(P, addr);
3421 case R_IA64_PCREL21B:
3422 ia64_reloc_pcrel21(P, S, oc);
3425 /* This goes with R_IA64_LTOFF22X and points to the load to
3426 * convert into a move. We don't implement relaxation. */
3428 # elif defined(powerpc_HOST_ARCH)
3429 case R_PPC_ADDR16_LO:
3430 *(Elf32_Half*) P = value;
3433 case R_PPC_ADDR16_HI:
3434 *(Elf32_Half*) P = value >> 16;
3437 case R_PPC_ADDR16_HA:
3438 *(Elf32_Half*) P = (value + 0x8000) >> 16;
3442 *(Elf32_Word *) P = value;
3446 *(Elf32_Word *) P = value - P;
3452 if( delta << 6 >> 6 != delta )
3454 value = makeJumpIsland( oc, ELF_R_SYM(info), value );
3457 if( value == 0 || delta << 6 >> 6 != delta )
3459 barf( "Unable to make ppcJumpIsland for #%d",
3465 *(Elf_Word *) P = (*(Elf_Word *) P & 0xfc000003)
3466 | (delta & 0x3fffffc);
3470 #if x86_64_HOST_ARCH
3472 *(Elf64_Xword *)P = value;
3477 StgInt64 off = value - P;
3478 if (off >= 0x7fffffffL || off < -0x80000000L) {
3479 barf("R_X86_64_PC32 relocation out of range: %s = %p",
3482 *(Elf64_Word *)P = (Elf64_Word)off;
3487 if (value >= 0x7fffffffL) {
3488 barf("R_X86_64_32 relocation out of range: %s = %p\n",
3491 *(Elf64_Word *)P = (Elf64_Word)value;
3495 if ((StgInt64)value > 0x7fffffffL || (StgInt64)value < -0x80000000L) {
3496 barf("R_X86_64_32S relocation out of range: %s = %p\n",
3499 *(Elf64_Sword *)P = (Elf64_Sword)value;
3504 errorBelch("%s: unhandled ELF relocation(RelA) type %lu\n",
3505 oc->fileName, (lnat)ELF_R_TYPE(info));
3514 ocResolve_ELF ( ObjectCode* oc )
3518 Elf_Sym* stab = NULL;
3519 char* ehdrC = (char*)(oc->image);
3520 Elf_Ehdr* ehdr = (Elf_Ehdr*) ehdrC;
3521 Elf_Shdr* shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
3523 /* first find "the" symbol table */
3524 stab = (Elf_Sym*) findElfSection ( ehdrC, SHT_SYMTAB );
3526 /* also go find the string table */
3527 strtab = findElfSection ( ehdrC, SHT_STRTAB );
3529 if (stab == NULL || strtab == NULL) {
3530 errorBelch("%s: can't find string or symbol table", oc->fileName);
3534 /* Process the relocation sections. */
3535 for (shnum = 0; shnum < ehdr->e_shnum; shnum++) {
3536 if (shdr[shnum].sh_type == SHT_REL) {
3537 ok = do_Elf_Rel_relocations ( oc, ehdrC, shdr,
3538 shnum, stab, strtab );
3542 if (shdr[shnum].sh_type == SHT_RELA) {
3543 ok = do_Elf_Rela_relocations ( oc, ehdrC, shdr,
3544 shnum, stab, strtab );
3549 /* Free the local symbol table; we won't need it again. */
3550 freeHashTable(oc->lochash, NULL);
3553 #if defined(powerpc_HOST_ARCH)
3554 ocFlushInstructionCache( oc );
3562 * Instructions are 41 bits long, packed into 128 bit bundles with a 5-bit template
3563 * at the front. The following utility functions pack and unpack instructions, and
3564 * take care of the most common relocations.
3567 #ifdef ia64_HOST_ARCH
3570 ia64_extract_instruction(Elf64_Xword *target)
3573 int slot = (Elf_Addr)target & 3;
3574 target = (Elf_Addr)target & ~3;
3582 return ((w1 >> 5) & 0x1ffffffffff);
3584 return (w1 >> 46) | ((w2 & 0x7fffff) << 18);
3588 barf("ia64_extract_instruction: invalid slot %p", target);
3593 ia64_deposit_instruction(Elf64_Xword *target, Elf64_Xword value)
3595 int slot = (Elf_Addr)target & 3;
3596 target = (Elf_Addr)target & ~3;
3601 *target |= value << 5;
3604 *target |= value << 46;
3605 *(target+1) |= value >> 18;
3608 *(target+1) |= value << 23;
3614 ia64_reloc_gprel22(Elf_Addr target, Elf_Addr value)
3616 Elf64_Xword instruction;
3617 Elf64_Sxword rel_value;
3619 rel_value = value - gp_val;
3620 if ((rel_value > 0x1fffff) || (rel_value < -0x1fffff))
3621 barf("GP-relative data out of range (address = 0x%lx, gp = 0x%lx)", value, gp_val);
3623 instruction = ia64_extract_instruction((Elf64_Xword *)target);
3624 instruction |= (((rel_value >> 0) & 0x07f) << 13) /* imm7b */
3625 | (((rel_value >> 7) & 0x1ff) << 27) /* imm9d */
3626 | (((rel_value >> 16) & 0x01f) << 22) /* imm5c */
3627 | ((Elf64_Xword)(rel_value < 0) << 36); /* s */
3628 ia64_deposit_instruction((Elf64_Xword *)target, instruction);
3632 ia64_reloc_pcrel21(Elf_Addr target, Elf_Addr value, ObjectCode *oc)
3634 Elf64_Xword instruction;
3635 Elf64_Sxword rel_value;
3638 entry = allocatePLTEntry(value, oc);
3640 rel_value = (entry >> 4) - (target >> 4);
3641 if ((rel_value > 0xfffff) || (rel_value < -0xfffff))
3642 barf("PLT entry too far away (entry = 0x%lx, target = 0x%lx)", entry, target);
3644 instruction = ia64_extract_instruction((Elf64_Xword *)target);
3645 instruction |= ((rel_value & 0xfffff) << 13) /* imm20b */
3646 | ((Elf64_Xword)(rel_value < 0) << 36); /* s */
3647 ia64_deposit_instruction((Elf64_Xword *)target, instruction);
3653 * PowerPC ELF specifics
3656 #ifdef powerpc_HOST_ARCH
3658 static int ocAllocateJumpIslands_ELF( ObjectCode *oc )
3664 ehdr = (Elf_Ehdr *) oc->image;
3665 shdr = (Elf_Shdr *) ( ((char *)oc->image) + ehdr->e_shoff );
3667 for( i = 0; i < ehdr->e_shnum; i++ )
3668 if( shdr[i].sh_type == SHT_SYMTAB )
3671 if( i == ehdr->e_shnum )
3673 errorBelch( "This ELF file contains no symtab" );
3677 if( shdr[i].sh_entsize != sizeof( Elf_Sym ) )
3679 errorBelch( "The entry size (%d) of the symtab isn't %d\n",
3680 shdr[i].sh_entsize, sizeof( Elf_Sym ) );
3685 return ocAllocateJumpIslands( oc, shdr[i].sh_size / sizeof( Elf_Sym ), 0 );
3688 #endif /* powerpc */
3692 /* --------------------------------------------------------------------------
3694 * ------------------------------------------------------------------------*/
3696 #if defined(OBJFORMAT_MACHO)
3699 Support for MachO linking on Darwin/MacOS X
3700 by Wolfgang Thaller (wolfgang.thaller@gmx.net)
3702 I hereby formally apologize for the hackish nature of this code.
3703 Things that need to be done:
3704 *) implement ocVerifyImage_MachO
3705 *) add still more sanity checks.
3708 #ifdef powerpc_HOST_ARCH
3709 static int ocAllocateJumpIslands_MachO(ObjectCode* oc)
3711 struct mach_header *header = (struct mach_header *) oc->image;
3712 struct load_command *lc = (struct load_command *) (header + 1);
3715 for( i = 0; i < header->ncmds; i++ )
3717 if( lc->cmd == LC_SYMTAB )
3719 // Find out the first and last undefined external
3720 // symbol, so we don't have to allocate too many
3722 struct symtab_command *symLC = (struct symtab_command *) lc;
3723 unsigned min = symLC->nsyms, max = 0;
3724 struct nlist *nlist =
3725 symLC ? (struct nlist*) ((char*) oc->image + symLC->symoff)
3727 for(i=0;i<symLC->nsyms;i++)
3729 if(nlist[i].n_type & N_STAB)
3731 else if(nlist[i].n_type & N_EXT)
3733 if((nlist[i].n_type & N_TYPE) == N_UNDF
3734 && (nlist[i].n_value == 0))
3744 return ocAllocateJumpIslands(oc, max - min + 1, min);
3749 lc = (struct load_command *) ( ((char *)lc) + lc->cmdsize );
3751 return ocAllocateJumpIslands(oc,0,0);
3755 static int ocVerifyImage_MachO(ObjectCode* oc STG_UNUSED)
3757 // FIXME: do some verifying here
3761 static int resolveImports(
3764 struct symtab_command *symLC,
3765 struct section *sect, // ptr to lazy or non-lazy symbol pointer section
3766 unsigned long *indirectSyms,
3767 struct nlist *nlist)
3770 size_t itemSize = 4;
3773 int isJumpTable = 0;
3774 if(!strcmp(sect->sectname,"__jump_table"))
3778 ASSERT(sect->reserved2 == itemSize);
3782 for(i=0; i*itemSize < sect->size;i++)
3784 // according to otool, reserved1 contains the first index into the indirect symbol table
3785 struct nlist *symbol = &nlist[indirectSyms[sect->reserved1+i]];
3786 char *nm = image + symLC->stroff + symbol->n_un.n_strx;
3789 if((symbol->n_type & N_TYPE) == N_UNDF
3790 && (symbol->n_type & N_EXT) && (symbol->n_value != 0))
3791 addr = (void*) (symbol->n_value);
3792 else if((addr = lookupLocalSymbol(oc,nm)) != NULL)
3795 addr = lookupSymbol(nm);
3798 errorBelch("\n%s: unknown symbol `%s'", oc->fileName, nm);
3806 checkProddableBlock(oc,image + sect->offset + i*itemSize);
3807 *(image + sect->offset + i*itemSize) = 0xe9; // jmp
3808 *(unsigned*)(image + sect->offset + i*itemSize + 1)
3809 = (char*)addr - (image + sect->offset + i*itemSize + 5);
3814 checkProddableBlock(oc,((void**)(image + sect->offset)) + i);
3815 ((void**)(image + sect->offset))[i] = addr;
3822 static unsigned long relocateAddress(
3825 struct section* sections,
3826 unsigned long address)
3829 for(i = 0; i < nSections; i++)
3831 if(sections[i].addr <= address
3832 && address < sections[i].addr + sections[i].size)
3834 return (unsigned long)oc->image
3835 + sections[i].offset + address - sections[i].addr;
3838 barf("Invalid Mach-O file:"
3839 "Address out of bounds while relocating object file");
3843 static int relocateSection(
3846 struct symtab_command *symLC, struct nlist *nlist,
3847 int nSections, struct section* sections, struct section *sect)
3849 struct relocation_info *relocs;
3852 if(!strcmp(sect->sectname,"__la_symbol_ptr"))
3854 else if(!strcmp(sect->sectname,"__nl_symbol_ptr"))
3856 else if(!strcmp(sect->sectname,"__la_sym_ptr2"))
3858 else if(!strcmp(sect->sectname,"__la_sym_ptr3"))
3862 relocs = (struct relocation_info*) (image + sect->reloff);
3866 if(relocs[i].r_address & R_SCATTERED)
3868 struct scattered_relocation_info *scat =
3869 (struct scattered_relocation_info*) &relocs[i];
3873 if(scat->r_length == 2)
3875 unsigned long word = 0;
3876 unsigned long* wordPtr = (unsigned long*) (image + sect->offset + scat->r_address);
3877 checkProddableBlock(oc,wordPtr);
3879 // Note on relocation types:
3880 // i386 uses the GENERIC_RELOC_* types,
3881 // while ppc uses special PPC_RELOC_* types.
3882 // *_RELOC_VANILLA and *_RELOC_PAIR have the same value
3883 // in both cases, all others are different.
3884 // Therefore, we use GENERIC_RELOC_VANILLA
3885 // and GENERIC_RELOC_PAIR instead of the PPC variants,
3886 // and use #ifdefs for the other types.
3888 // Step 1: Figure out what the relocated value should be
3889 if(scat->r_type == GENERIC_RELOC_VANILLA)
3891 word = *wordPtr + (unsigned long) relocateAddress(
3898 #ifdef powerpc_HOST_ARCH
3899 else if(scat->r_type == PPC_RELOC_SECTDIFF
3900 || scat->r_type == PPC_RELOC_LO16_SECTDIFF
3901 || scat->r_type == PPC_RELOC_HI16_SECTDIFF
3902 || scat->r_type == PPC_RELOC_HA16_SECTDIFF)
3904 else if(scat->r_type == GENERIC_RELOC_SECTDIFF)
3907 struct scattered_relocation_info *pair =
3908 (struct scattered_relocation_info*) &relocs[i+1];
3910 if(!pair->r_scattered || pair->r_type != GENERIC_RELOC_PAIR)
3911 barf("Invalid Mach-O file: "
3912 "RELOC_*_SECTDIFF not followed by RELOC_PAIR");
3914 word = (unsigned long)
3915 (relocateAddress(oc, nSections, sections, scat->r_value)
3916 - relocateAddress(oc, nSections, sections, pair->r_value));
3919 #ifdef powerpc_HOST_ARCH
3920 else if(scat->r_type == PPC_RELOC_HI16
3921 || scat->r_type == PPC_RELOC_LO16
3922 || scat->r_type == PPC_RELOC_HA16
3923 || scat->r_type == PPC_RELOC_LO14)
3924 { // these are generated by label+offset things
3925 struct relocation_info *pair = &relocs[i+1];
3926 if((pair->r_address & R_SCATTERED) || pair->r_type != PPC_RELOC_PAIR)
3927 barf("Invalid Mach-O file: "
3928 "PPC_RELOC_* not followed by PPC_RELOC_PAIR");
3930 if(scat->r_type == PPC_RELOC_LO16)
3932 word = ((unsigned short*) wordPtr)[1];
3933 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
3935 else if(scat->r_type == PPC_RELOC_LO14)
3937 barf("Unsupported Relocation: PPC_RELOC_LO14");
3938 word = ((unsigned short*) wordPtr)[1] & 0xFFFC;
3939 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
3941 else if(scat->r_type == PPC_RELOC_HI16)
3943 word = ((unsigned short*) wordPtr)[1] << 16;
3944 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF);
3946 else if(scat->r_type == PPC_RELOC_HA16)
3948 word = ((unsigned short*) wordPtr)[1] << 16;
3949 word += ((short)relocs[i+1].r_address & (short)0xFFFF);
3953 word += (unsigned long) relocateAddress(oc, nSections, sections, scat->r_value)
3960 continue; // ignore the others
3962 #ifdef powerpc_HOST_ARCH
3963 if(scat->r_type == GENERIC_RELOC_VANILLA
3964 || scat->r_type == PPC_RELOC_SECTDIFF)
3966 if(scat->r_type == GENERIC_RELOC_VANILLA
3967 || scat->r_type == GENERIC_RELOC_SECTDIFF)
3972 #ifdef powerpc_HOST_ARCH
3973 else if(scat->r_type == PPC_RELOC_LO16_SECTDIFF || scat->r_type == PPC_RELOC_LO16)
3975 ((unsigned short*) wordPtr)[1] = word & 0xFFFF;
3977 else if(scat->r_type == PPC_RELOC_HI16_SECTDIFF || scat->r_type == PPC_RELOC_HI16)
3979 ((unsigned short*) wordPtr)[1] = (word >> 16) & 0xFFFF;
3981 else if(scat->r_type == PPC_RELOC_HA16_SECTDIFF || scat->r_type == PPC_RELOC_HA16)
3983 ((unsigned short*) wordPtr)[1] = ((word >> 16) & 0xFFFF)
3984 + ((word & (1<<15)) ? 1 : 0);
3990 continue; // FIXME: I hope it's OK to ignore all the others.
3994 struct relocation_info *reloc = &relocs[i];
3995 if(reloc->r_pcrel && !reloc->r_extern)
3998 if(reloc->r_length == 2)
4000 unsigned long word = 0;
4001 #ifdef powerpc_HOST_ARCH
4002 unsigned long jumpIsland = 0;
4003 long offsetToJumpIsland = 0xBADBAD42; // initialise to bad value
4004 // to avoid warning and to catch
4008 unsigned long* wordPtr = (unsigned long*) (image + sect->offset + reloc->r_address);
4009 checkProddableBlock(oc,wordPtr);
4011 if(reloc->r_type == GENERIC_RELOC_VANILLA)
4015 #ifdef powerpc_HOST_ARCH
4016 else if(reloc->r_type == PPC_RELOC_LO16)
4018 word = ((unsigned short*) wordPtr)[1];
4019 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
4021 else if(reloc->r_type == PPC_RELOC_HI16)
4023 word = ((unsigned short*) wordPtr)[1] << 16;
4024 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF);
4026 else if(reloc->r_type == PPC_RELOC_HA16)
4028 word = ((unsigned short*) wordPtr)[1] << 16;
4029 word += ((short)relocs[i+1].r_address & (short)0xFFFF);
4031 else if(reloc->r_type == PPC_RELOC_BR24)
4034 word = (word & 0x03FFFFFC) | ((word & 0x02000000) ? 0xFC000000 : 0);
4038 if(!reloc->r_extern)
4041 sections[reloc->r_symbolnum-1].offset
4042 - sections[reloc->r_symbolnum-1].addr
4049 struct nlist *symbol = &nlist[reloc->r_symbolnum];
4050 char *nm = image + symLC->stroff + symbol->n_un.n_strx;
4051 void *symbolAddress = lookupSymbol(nm);
4054 errorBelch("\nunknown symbol `%s'", nm);
4060 #ifdef powerpc_HOST_ARCH
4061 // In the .o file, this should be a relative jump to NULL
4062 // and we'll change it to a relative jump to the symbol
4063 ASSERT(-word == reloc->r_address);
4064 jumpIsland = makeJumpIsland(oc,reloc->r_symbolnum,(unsigned long) symbolAddress);
4067 offsetToJumpIsland = word + jumpIsland
4068 - (((long)image) + sect->offset - sect->addr);
4071 word += (unsigned long) symbolAddress
4072 - (((long)image) + sect->offset - sect->addr);
4076 word += (unsigned long) symbolAddress;
4080 if(reloc->r_type == GENERIC_RELOC_VANILLA)
4085 #ifdef powerpc_HOST_ARCH
4086 else if(reloc->r_type == PPC_RELOC_LO16)
4088 ((unsigned short*) wordPtr)[1] = word & 0xFFFF;
4091 else if(reloc->r_type == PPC_RELOC_HI16)
4093 ((unsigned short*) wordPtr)[1] = (word >> 16) & 0xFFFF;
4096 else if(reloc->r_type == PPC_RELOC_HA16)
4098 ((unsigned short*) wordPtr)[1] = ((word >> 16) & 0xFFFF)
4099 + ((word & (1<<15)) ? 1 : 0);
4102 else if(reloc->r_type == PPC_RELOC_BR24)
4104 if((long)word > (long)0x01FFFFFF || (long)word < (long)0xFFE00000)
4106 // The branch offset is too large.
4107 // Therefore, we try to use a jump island.
4110 barf("unconditional relative branch out of range: "
4111 "no jump island available");
4114 word = offsetToJumpIsland;
4115 if((long)word > (long)0x01FFFFFF || (long)word < (long)0xFFE00000)
4116 barf("unconditional relative branch out of range: "
4117 "jump island out of range");
4119 *wordPtr = (*wordPtr & 0xFC000003) | (word & 0x03FFFFFC);
4124 barf("\nunknown relocation %d",reloc->r_type);
4131 static int ocGetNames_MachO(ObjectCode* oc)
4133 char *image = (char*) oc->image;
4134 struct mach_header *header = (struct mach_header*) image;
4135 struct load_command *lc = (struct load_command*) (image + sizeof(struct mach_header));
4136 unsigned i,curSymbol = 0;
4137 struct segment_command *segLC = NULL;
4138 struct section *sections;
4139 struct symtab_command *symLC = NULL;
4140 struct nlist *nlist;
4141 unsigned long commonSize = 0;
4142 char *commonStorage = NULL;
4143 unsigned long commonCounter;
4145 for(i=0;i<header->ncmds;i++)
4147 if(lc->cmd == LC_SEGMENT)
4148 segLC = (struct segment_command*) lc;
4149 else if(lc->cmd == LC_SYMTAB)
4150 symLC = (struct symtab_command*) lc;
4151 lc = (struct load_command *) ( ((char*)lc) + lc->cmdsize );
4154 sections = (struct section*) (segLC+1);
4155 nlist = symLC ? (struct nlist*) (image + symLC->symoff)
4158 for(i=0;i<segLC->nsects;i++)
4160 if(sections[i].size == 0)
4163 if((sections[i].flags & SECTION_TYPE) == S_ZEROFILL)
4165 char * zeroFillArea = stgCallocBytes(1,sections[i].size,
4166 "ocGetNames_MachO(common symbols)");
4167 sections[i].offset = zeroFillArea - image;
4170 if(!strcmp(sections[i].sectname,"__text"))
4171 addSection(oc, SECTIONKIND_CODE_OR_RODATA,
4172 (void*) (image + sections[i].offset),
4173 (void*) (image + sections[i].offset + sections[i].size));
4174 else if(!strcmp(sections[i].sectname,"__const"))
4175 addSection(oc, SECTIONKIND_RWDATA,
4176 (void*) (image + sections[i].offset),
4177 (void*) (image + sections[i].offset + sections[i].size));
4178 else if(!strcmp(sections[i].sectname,"__data"))
4179 addSection(oc, SECTIONKIND_RWDATA,
4180 (void*) (image + sections[i].offset),
4181 (void*) (image + sections[i].offset + sections[i].size));
4182 else if(!strcmp(sections[i].sectname,"__bss")
4183 || !strcmp(sections[i].sectname,"__common"))
4184 addSection(oc, SECTIONKIND_RWDATA,
4185 (void*) (image + sections[i].offset),
4186 (void*) (image + sections[i].offset + sections[i].size));
4188 addProddableBlock(oc, (void*) (image + sections[i].offset),
4192 // count external symbols defined here
4196 for(i=0;i<symLC->nsyms;i++)
4198 if(nlist[i].n_type & N_STAB)
4200 else if(nlist[i].n_type & N_EXT)
4202 if((nlist[i].n_type & N_TYPE) == N_UNDF
4203 && (nlist[i].n_value != 0))
4205 commonSize += nlist[i].n_value;
4208 else if((nlist[i].n_type & N_TYPE) == N_SECT)
4213 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
4214 "ocGetNames_MachO(oc->symbols)");
4218 for(i=0;i<symLC->nsyms;i++)
4220 if(nlist[i].n_type & N_STAB)
4222 else if((nlist[i].n_type & N_TYPE) == N_SECT)
4224 if(nlist[i].n_type & N_EXT)
4226 char *nm = image + symLC->stroff + nlist[i].n_un.n_strx;
4227 ghciInsertStrHashTable(oc->fileName, symhash, nm,
4229 + sections[nlist[i].n_sect-1].offset
4230 - sections[nlist[i].n_sect-1].addr
4231 + nlist[i].n_value);
4232 oc->symbols[curSymbol++] = nm;
4236 char *nm = image + symLC->stroff + nlist[i].n_un.n_strx;
4237 ghciInsertStrHashTable(oc->fileName, oc->lochash, nm,
4239 + sections[nlist[i].n_sect-1].offset
4240 - sections[nlist[i].n_sect-1].addr
4241 + nlist[i].n_value);
4247 commonStorage = stgCallocBytes(1,commonSize,"ocGetNames_MachO(common symbols)");
4248 commonCounter = (unsigned long)commonStorage;
4251 for(i=0;i<symLC->nsyms;i++)
4253 if((nlist[i].n_type & N_TYPE) == N_UNDF
4254 && (nlist[i].n_type & N_EXT) && (nlist[i].n_value != 0))
4256 char *nm = image + symLC->stroff + nlist[i].n_un.n_strx;
4257 unsigned long sz = nlist[i].n_value;
4259 nlist[i].n_value = commonCounter;
4261 ghciInsertStrHashTable(oc->fileName, symhash, nm,
4262 (void*)commonCounter);
4263 oc->symbols[curSymbol++] = nm;
4265 commonCounter += sz;
4272 static int ocResolve_MachO(ObjectCode* oc)
4274 char *image = (char*) oc->image;
4275 struct mach_header *header = (struct mach_header*) image;
4276 struct load_command *lc = (struct load_command*) (image + sizeof(struct mach_header));
4278 struct segment_command *segLC = NULL;
4279 struct section *sections;
4280 struct symtab_command *symLC = NULL;
4281 struct dysymtab_command *dsymLC = NULL;
4282 struct nlist *nlist;
4284 for(i=0;i<header->ncmds;i++)
4286 if(lc->cmd == LC_SEGMENT)
4287 segLC = (struct segment_command*) lc;
4288 else if(lc->cmd == LC_SYMTAB)
4289 symLC = (struct symtab_command*) lc;
4290 else if(lc->cmd == LC_DYSYMTAB)
4291 dsymLC = (struct dysymtab_command*) lc;
4292 lc = (struct load_command *) ( ((char*)lc) + lc->cmdsize );
4295 sections = (struct section*) (segLC+1);
4296 nlist = symLC ? (struct nlist*) (image + symLC->symoff)
4301 unsigned long *indirectSyms
4302 = (unsigned long*) (image + dsymLC->indirectsymoff);
4304 for(i=0;i<segLC->nsects;i++)
4306 if( !strcmp(sections[i].sectname,"__la_symbol_ptr")
4307 || !strcmp(sections[i].sectname,"__la_sym_ptr2")
4308 || !strcmp(sections[i].sectname,"__la_sym_ptr3"))
4310 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4313 else if(!strcmp(sections[i].sectname,"__nl_symbol_ptr")
4314 || !strcmp(sections[i].sectname,"__pointers"))
4316 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4319 else if(!strcmp(sections[i].sectname,"__jump_table"))
4321 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4327 for(i=0;i<segLC->nsects;i++)
4329 if(!relocateSection(oc,image,symLC,nlist,segLC->nsects,sections,§ions[i]))
4333 /* Free the local symbol table; we won't need it again. */
4334 freeHashTable(oc->lochash, NULL);
4337 #if defined (powerpc_HOST_ARCH)
4338 ocFlushInstructionCache( oc );
4344 #ifdef powerpc_HOST_ARCH
4346 * The Mach-O object format uses leading underscores. But not everywhere.
4347 * There is a small number of runtime support functions defined in
4348 * libcc_dynamic.a whose name does not have a leading underscore.
4349 * As a consequence, we can't get their address from C code.
4350 * We have to use inline assembler just to take the address of a function.
4354 static void machoInitSymbolsWithoutUnderscore()
4356 extern void* symbolsWithoutUnderscore[];
4357 void **p = symbolsWithoutUnderscore;
4358 __asm__ volatile(".globl _symbolsWithoutUnderscore\n.data\n_symbolsWithoutUnderscore:");
4362 __asm__ volatile(".long " # x);
4364 RTS_MACHO_NOUNDERLINE_SYMBOLS
4366 __asm__ volatile(".text");
4370 ghciInsertStrHashTable("(GHCi built-in symbols)", symhash, #x, *p++);
4372 RTS_MACHO_NOUNDERLINE_SYMBOLS
4379 * Figure out by how much to shift the entire Mach-O file in memory
4380 * when loading so that its single segment ends up 16-byte-aligned
4382 static int machoGetMisalignment( FILE * f )
4384 struct mach_header header;
4387 fread(&header, sizeof(header), 1, f);
4390 if(header.magic != MH_MAGIC)
4393 misalignment = (header.sizeofcmds + sizeof(header))
4396 return misalignment ? (16 - misalignment) : 0;
4401 int isSuffixOf(char* x, char* suffix) {
4402 int suffix_len = strlen (suffix);
4403 int x_len = strlen (x);
4407 if (suffix_len > x_len)
4409 if (suffix_len == 0)
4412 char* x_suffix = &x[strlen(x)-strlen(suffix)];
4413 return strcmp(x_suffix, suffix) == 0;