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)");
1328 oc->image = stgMallocBytes(oc->fileSize, "loadObj(image)");
1331 n = fread ( oc->image, 1, oc->fileSize, f );
1332 if (n != oc->fileSize)
1333 barf("loadObj: error whilst reading `%s'", path);
1337 #endif /* USE_MMAP */
1339 # if defined(OBJFORMAT_MACHO) && defined(powerpc_HOST_ARCH)
1340 r = ocAllocateJumpIslands_MachO ( oc );
1341 if (!r) { return r; }
1342 # elif defined(OBJFORMAT_ELF) && defined(powerpc_HOST_ARCH)
1343 r = ocAllocateJumpIslands_ELF ( oc );
1344 if (!r) { return r; }
1347 /* verify the in-memory image */
1348 # if defined(OBJFORMAT_ELF)
1349 r = ocVerifyImage_ELF ( oc );
1350 # elif defined(OBJFORMAT_PEi386)
1351 r = ocVerifyImage_PEi386 ( oc );
1352 # elif defined(OBJFORMAT_MACHO)
1353 r = ocVerifyImage_MachO ( oc );
1355 barf("loadObj: no verify method");
1357 if (!r) { return r; }
1359 /* build the symbol list for this image */
1360 # if defined(OBJFORMAT_ELF)
1361 r = ocGetNames_ELF ( oc );
1362 # elif defined(OBJFORMAT_PEi386)
1363 r = ocGetNames_PEi386 ( oc );
1364 # elif defined(OBJFORMAT_MACHO)
1365 r = ocGetNames_MachO ( oc );
1367 barf("loadObj: no getNames method");
1369 if (!r) { return r; }
1371 /* loaded, but not resolved yet */
1372 oc->status = OBJECT_LOADED;
1377 /* -----------------------------------------------------------------------------
1378 * resolve all the currently unlinked objects in memory
1380 * Returns: 1 if ok, 0 on error.
1390 for (oc = objects; oc; oc = oc->next) {
1391 if (oc->status != OBJECT_RESOLVED) {
1392 # if defined(OBJFORMAT_ELF)
1393 r = ocResolve_ELF ( oc );
1394 # elif defined(OBJFORMAT_PEi386)
1395 r = ocResolve_PEi386 ( oc );
1396 # elif defined(OBJFORMAT_MACHO)
1397 r = ocResolve_MachO ( oc );
1399 barf("resolveObjs: not implemented on this platform");
1401 if (!r) { return r; }
1402 oc->status = OBJECT_RESOLVED;
1408 /* -----------------------------------------------------------------------------
1409 * delete an object from the pool
1412 unloadObj( char *path )
1414 ObjectCode *oc, *prev;
1416 ASSERT(symhash != NULL);
1417 ASSERT(objects != NULL);
1422 for (oc = objects; oc; prev = oc, oc = oc->next) {
1423 if (!strcmp(oc->fileName,path)) {
1425 /* Remove all the mappings for the symbols within this
1430 for (i = 0; i < oc->n_symbols; i++) {
1431 if (oc->symbols[i] != NULL) {
1432 removeStrHashTable(symhash, oc->symbols[i], NULL);
1440 prev->next = oc->next;
1443 // We're going to leave this in place, in case there are
1444 // any pointers from the heap into it:
1445 // #ifdef mingw32_HOST_OS
1446 // VirtualFree(oc->image);
1448 // stgFree(oc->image);
1450 stgFree(oc->fileName);
1451 stgFree(oc->symbols);
1452 stgFree(oc->sections);
1453 /* The local hash table should have been freed at the end
1454 of the ocResolve_ call on it. */
1455 ASSERT(oc->lochash == NULL);
1461 errorBelch("unloadObj: can't find `%s' to unload", path);
1465 /* -----------------------------------------------------------------------------
1466 * Sanity checking. For each ObjectCode, maintain a list of address ranges
1467 * which may be prodded during relocation, and abort if we try and write
1468 * outside any of these.
1470 static void addProddableBlock ( ObjectCode* oc, void* start, int size )
1473 = stgMallocBytes(sizeof(ProddableBlock), "addProddableBlock");
1474 /* debugBelch("aPB %p %p %d\n", oc, start, size); */
1478 pb->next = oc->proddables;
1479 oc->proddables = pb;
1482 static void checkProddableBlock ( ObjectCode* oc, void* addr )
1485 for (pb = oc->proddables; pb != NULL; pb = pb->next) {
1486 char* s = (char*)(pb->start);
1487 char* e = s + pb->size - 1;
1488 char* a = (char*)addr;
1489 /* Assumes that the biggest fixup involves a 4-byte write. This
1490 probably needs to be changed to 8 (ie, +7) on 64-bit
1492 if (a >= s && (a+3) <= e) return;
1494 barf("checkProddableBlock: invalid fixup in runtime linker");
1497 /* -----------------------------------------------------------------------------
1498 * Section management.
1500 static void addSection ( ObjectCode* oc, SectionKind kind,
1501 void* start, void* end )
1503 Section* s = stgMallocBytes(sizeof(Section), "addSection");
1507 s->next = oc->sections;
1510 debugBelch("addSection: %p-%p (size %d), kind %d\n",
1511 start, ((char*)end)-1, end - start + 1, kind );
1516 /* --------------------------------------------------------------------------
1517 * PowerPC specifics (jump islands)
1518 * ------------------------------------------------------------------------*/
1520 #if defined(powerpc_HOST_ARCH)
1523 ocAllocateJumpIslands
1525 Allocate additional space at the end of the object file image to make room
1528 PowerPC relative branch instructions have a 24 bit displacement field.
1529 As PPC code is always 4-byte-aligned, this yields a +-32MB range.
1530 If a particular imported symbol is outside this range, we have to redirect
1531 the jump to a short piece of new code that just loads the 32bit absolute
1532 address and jumps there.
1533 This function just allocates space for one 16 byte ppcJumpIsland for every
1534 undefined symbol in the object file. The code for the islands is filled in by
1535 makeJumpIsland below.
1538 static int ocAllocateJumpIslands( ObjectCode* oc, int count, int first )
1544 int misalignment = 0;
1546 misalignment = oc->misalignment;
1551 // round up to the nearest 4
1552 aligned = (oc->fileSize + 3) & ~3;
1555 #ifndef linux_HOST_OS /* mremap is a linux extension */
1556 #error ocAllocateJumpIslands doesnt want USE_MMAP to be defined
1559 pagesize = getpagesize();
1560 n = ROUND_UP( oc->fileSize, pagesize );
1561 m = ROUND_UP( aligned + sizeof (ppcJumpIsland) * count, pagesize );
1563 /* If we have a half-page-size file and map one page of it then
1564 * the part of the page after the size of the file remains accessible.
1565 * If, however, we map in 2 pages, the 2nd page is not accessible
1566 * and will give a "Bus Error" on access. To get around this, we check
1567 * if we need any extra pages for the jump islands and map them in
1568 * anonymously. We must check that we actually require extra pages
1569 * otherwise the attempt to mmap 0 pages of anonymous memory will
1575 /* The effect of this mremap() call is only the ensure that we have
1576 * a sufficient number of virtually contiguous pages. As returned from
1577 * mremap, the pages past the end of the file are not backed. We give
1578 * them a backing by using MAP_FIXED to map in anonymous pages.
1580 oc->image = mremap( oc->image, n, m, MREMAP_MAYMOVE );
1582 if( oc->image == MAP_FAILED )
1584 errorBelch( "Unable to mremap for Jump Islands\n" );
1588 if( mmap( oc->image + n, m - n, PROT_READ | PROT_WRITE | PROT_EXEC,
1589 MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED, 0, 0 ) == MAP_FAILED )
1591 errorBelch( "Unable to mmap( MAP_FIXED ) for Jump Islands\n" );
1597 oc->image -= misalignment;
1598 oc->image = stgReallocBytes( oc->image,
1600 aligned + sizeof (ppcJumpIsland) * count,
1601 "ocAllocateJumpIslands" );
1602 oc->image += misalignment;
1603 #endif /* USE_MMAP */
1605 oc->jump_islands = (ppcJumpIsland *) (oc->image + aligned);
1606 memset( oc->jump_islands, 0, sizeof (ppcJumpIsland) * count );
1609 oc->jump_islands = NULL;
1611 oc->island_start_symbol = first;
1612 oc->n_islands = count;
1617 static unsigned long makeJumpIsland( ObjectCode* oc,
1618 unsigned long symbolNumber,
1619 unsigned long target )
1621 ppcJumpIsland *island;
1623 if( symbolNumber < oc->island_start_symbol ||
1624 symbolNumber - oc->island_start_symbol > oc->n_islands)
1627 island = &oc->jump_islands[symbolNumber - oc->island_start_symbol];
1629 // lis r12, hi16(target)
1630 island->lis_r12 = 0x3d80;
1631 island->hi_addr = target >> 16;
1633 // ori r12, r12, lo16(target)
1634 island->ori_r12_r12 = 0x618c;
1635 island->lo_addr = target & 0xffff;
1638 island->mtctr_r12 = 0x7d8903a6;
1641 island->bctr = 0x4e800420;
1643 return (unsigned long) island;
1647 ocFlushInstructionCache
1649 Flush the data & instruction caches.
1650 Because the PPC has split data/instruction caches, we have to
1651 do that whenever we modify code at runtime.
1654 static void ocFlushInstructionCache( ObjectCode *oc )
1656 int n = (oc->fileSize + sizeof( ppcJumpIsland ) * oc->n_islands + 3) / 4;
1657 unsigned long *p = (unsigned long *) oc->image;
1661 __asm__ volatile ( "dcbf 0,%0\n\t"
1669 __asm__ volatile ( "sync\n\t"
1675 /* --------------------------------------------------------------------------
1676 * PEi386 specifics (Win32 targets)
1677 * ------------------------------------------------------------------------*/
1679 /* The information for this linker comes from
1680 Microsoft Portable Executable
1681 and Common Object File Format Specification
1682 revision 5.1 January 1998
1683 which SimonM says comes from the MS Developer Network CDs.
1685 It can be found there (on older CDs), but can also be found
1688 http://www.microsoft.com/hwdev/hardware/PECOFF.asp
1690 (this is Rev 6.0 from February 1999).
1692 Things move, so if that fails, try searching for it via
1694 http://www.google.com/search?q=PE+COFF+specification
1696 The ultimate reference for the PE format is the Winnt.h
1697 header file that comes with the Platform SDKs; as always,
1698 implementations will drift wrt their documentation.
1700 A good background article on the PE format is Matt Pietrek's
1701 March 1994 article in Microsoft System Journal (MSJ)
1702 (Vol.9, No. 3): "Peering Inside the PE: A Tour of the
1703 Win32 Portable Executable File Format." The info in there
1704 has recently been updated in a two part article in
1705 MSDN magazine, issues Feb and March 2002,
1706 "Inside Windows: An In-Depth Look into the Win32 Portable
1707 Executable File Format"
1709 John Levine's book "Linkers and Loaders" contains useful
1714 #if defined(OBJFORMAT_PEi386)
1718 typedef unsigned char UChar;
1719 typedef unsigned short UInt16;
1720 typedef unsigned int UInt32;
1727 UInt16 NumberOfSections;
1728 UInt32 TimeDateStamp;
1729 UInt32 PointerToSymbolTable;
1730 UInt32 NumberOfSymbols;
1731 UInt16 SizeOfOptionalHeader;
1732 UInt16 Characteristics;
1736 #define sizeof_COFF_header 20
1743 UInt32 VirtualAddress;
1744 UInt32 SizeOfRawData;
1745 UInt32 PointerToRawData;
1746 UInt32 PointerToRelocations;
1747 UInt32 PointerToLinenumbers;
1748 UInt16 NumberOfRelocations;
1749 UInt16 NumberOfLineNumbers;
1750 UInt32 Characteristics;
1754 #define sizeof_COFF_section 40
1761 UInt16 SectionNumber;
1764 UChar NumberOfAuxSymbols;
1768 #define sizeof_COFF_symbol 18
1773 UInt32 VirtualAddress;
1774 UInt32 SymbolTableIndex;
1779 #define sizeof_COFF_reloc 10
1782 /* From PE spec doc, section 3.3.2 */
1783 /* Note use of MYIMAGE_* since IMAGE_* are already defined in
1784 windows.h -- for the same purpose, but I want to know what I'm
1786 #define MYIMAGE_FILE_RELOCS_STRIPPED 0x0001
1787 #define MYIMAGE_FILE_EXECUTABLE_IMAGE 0x0002
1788 #define MYIMAGE_FILE_DLL 0x2000
1789 #define MYIMAGE_FILE_SYSTEM 0x1000
1790 #define MYIMAGE_FILE_BYTES_REVERSED_HI 0x8000
1791 #define MYIMAGE_FILE_BYTES_REVERSED_LO 0x0080
1792 #define MYIMAGE_FILE_32BIT_MACHINE 0x0100
1794 /* From PE spec doc, section 5.4.2 and 5.4.4 */
1795 #define MYIMAGE_SYM_CLASS_EXTERNAL 2
1796 #define MYIMAGE_SYM_CLASS_STATIC 3
1797 #define MYIMAGE_SYM_UNDEFINED 0
1799 /* From PE spec doc, section 4.1 */
1800 #define MYIMAGE_SCN_CNT_CODE 0x00000020
1801 #define MYIMAGE_SCN_CNT_INITIALIZED_DATA 0x00000040
1802 #define MYIMAGE_SCN_LNK_NRELOC_OVFL 0x01000000
1804 /* From PE spec doc, section 5.2.1 */
1805 #define MYIMAGE_REL_I386_DIR32 0x0006
1806 #define MYIMAGE_REL_I386_REL32 0x0014
1809 /* We use myindex to calculate array addresses, rather than
1810 simply doing the normal subscript thing. That's because
1811 some of the above structs have sizes which are not
1812 a whole number of words. GCC rounds their sizes up to a
1813 whole number of words, which means that the address calcs
1814 arising from using normal C indexing or pointer arithmetic
1815 are just plain wrong. Sigh.
1818 myindex ( int scale, void* base, int index )
1821 ((UChar*)base) + scale * index;
1826 printName ( UChar* name, UChar* strtab )
1828 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
1829 UInt32 strtab_offset = * (UInt32*)(name+4);
1830 debugBelch("%s", strtab + strtab_offset );
1833 for (i = 0; i < 8; i++) {
1834 if (name[i] == 0) break;
1835 debugBelch("%c", name[i] );
1842 copyName ( UChar* name, UChar* strtab, UChar* dst, int dstSize )
1844 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
1845 UInt32 strtab_offset = * (UInt32*)(name+4);
1846 strncpy ( dst, strtab+strtab_offset, dstSize );
1852 if (name[i] == 0) break;
1862 cstring_from_COFF_symbol_name ( UChar* name, UChar* strtab )
1865 /* If the string is longer than 8 bytes, look in the
1866 string table for it -- this will be correctly zero terminated.
1868 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
1869 UInt32 strtab_offset = * (UInt32*)(name+4);
1870 return ((UChar*)strtab) + strtab_offset;
1872 /* Otherwise, if shorter than 8 bytes, return the original,
1873 which by defn is correctly terminated.
1875 if (name[7]==0) return name;
1876 /* The annoying case: 8 bytes. Copy into a temporary
1877 (which is never freed ...)
1879 newstr = stgMallocBytes(9, "cstring_from_COFF_symbol_name");
1881 strncpy(newstr,name,8);
1887 /* Just compares the short names (first 8 chars) */
1888 static COFF_section *
1889 findPEi386SectionCalled ( ObjectCode* oc, char* name )
1893 = (COFF_header*)(oc->image);
1894 COFF_section* sectab
1896 ((UChar*)(oc->image))
1897 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
1899 for (i = 0; i < hdr->NumberOfSections; i++) {
1902 COFF_section* section_i
1904 myindex ( sizeof_COFF_section, sectab, i );
1905 n1 = (UChar*) &(section_i->Name);
1907 if (n1[0]==n2[0] && n1[1]==n2[1] && n1[2]==n2[2] &&
1908 n1[3]==n2[3] && n1[4]==n2[4] && n1[5]==n2[5] &&
1909 n1[6]==n2[6] && n1[7]==n2[7])
1918 zapTrailingAtSign ( UChar* sym )
1920 # define my_isdigit(c) ((c) >= '0' && (c) <= '9')
1922 if (sym[0] == 0) return;
1924 while (sym[i] != 0) i++;
1927 while (j > 0 && my_isdigit(sym[j])) j--;
1928 if (j > 0 && sym[j] == '@' && j != i) sym[j] = 0;
1934 ocVerifyImage_PEi386 ( ObjectCode* oc )
1939 COFF_section* sectab;
1940 COFF_symbol* symtab;
1942 /* debugBelch("\nLOADING %s\n", oc->fileName); */
1943 hdr = (COFF_header*)(oc->image);
1944 sectab = (COFF_section*) (
1945 ((UChar*)(oc->image))
1946 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
1948 symtab = (COFF_symbol*) (
1949 ((UChar*)(oc->image))
1950 + hdr->PointerToSymbolTable
1952 strtab = ((UChar*)symtab)
1953 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
1955 if (hdr->Machine != 0x14c) {
1956 errorBelch("%s: Not x86 PEi386", oc->fileName);
1959 if (hdr->SizeOfOptionalHeader != 0) {
1960 errorBelch("%s: PEi386 with nonempty optional header", oc->fileName);
1963 if ( /* (hdr->Characteristics & MYIMAGE_FILE_RELOCS_STRIPPED) || */
1964 (hdr->Characteristics & MYIMAGE_FILE_EXECUTABLE_IMAGE) ||
1965 (hdr->Characteristics & MYIMAGE_FILE_DLL) ||
1966 (hdr->Characteristics & MYIMAGE_FILE_SYSTEM) ) {
1967 errorBelch("%s: Not a PEi386 object file", oc->fileName);
1970 if ( (hdr->Characteristics & MYIMAGE_FILE_BYTES_REVERSED_HI)
1971 /* || !(hdr->Characteristics & MYIMAGE_FILE_32BIT_MACHINE) */ ) {
1972 errorBelch("%s: Invalid PEi386 word size or endiannness: %d",
1974 (int)(hdr->Characteristics));
1977 /* If the string table size is way crazy, this might indicate that
1978 there are more than 64k relocations, despite claims to the
1979 contrary. Hence this test. */
1980 /* debugBelch("strtab size %d\n", * (UInt32*)strtab); */
1982 if ( (*(UInt32*)strtab) > 600000 ) {
1983 /* Note that 600k has no special significance other than being
1984 big enough to handle the almost-2MB-sized lumps that
1985 constitute HSwin32*.o. */
1986 debugBelch("PEi386 object has suspiciously large string table; > 64k relocs?");
1991 /* No further verification after this point; only debug printing. */
1993 IF_DEBUG(linker, i=1);
1994 if (i == 0) return 1;
1996 debugBelch( "sectab offset = %d\n", ((UChar*)sectab) - ((UChar*)hdr) );
1997 debugBelch( "symtab offset = %d\n", ((UChar*)symtab) - ((UChar*)hdr) );
1998 debugBelch( "strtab offset = %d\n", ((UChar*)strtab) - ((UChar*)hdr) );
2001 debugBelch( "Machine: 0x%x\n", (UInt32)(hdr->Machine) );
2002 debugBelch( "# sections: %d\n", (UInt32)(hdr->NumberOfSections) );
2003 debugBelch( "time/date: 0x%x\n", (UInt32)(hdr->TimeDateStamp) );
2004 debugBelch( "symtab offset: %d\n", (UInt32)(hdr->PointerToSymbolTable) );
2005 debugBelch( "# symbols: %d\n", (UInt32)(hdr->NumberOfSymbols) );
2006 debugBelch( "sz of opt hdr: %d\n", (UInt32)(hdr->SizeOfOptionalHeader) );
2007 debugBelch( "characteristics: 0x%x\n", (UInt32)(hdr->Characteristics) );
2009 /* Print the section table. */
2011 for (i = 0; i < hdr->NumberOfSections; i++) {
2013 COFF_section* sectab_i
2015 myindex ( sizeof_COFF_section, sectab, i );
2022 printName ( sectab_i->Name, strtab );
2032 sectab_i->VirtualSize,
2033 sectab_i->VirtualAddress,
2034 sectab_i->SizeOfRawData,
2035 sectab_i->PointerToRawData,
2036 sectab_i->NumberOfRelocations,
2037 sectab_i->PointerToRelocations,
2038 sectab_i->PointerToRawData
2040 reltab = (COFF_reloc*) (
2041 ((UChar*)(oc->image)) + sectab_i->PointerToRelocations
2044 if ( sectab_i->Characteristics & MYIMAGE_SCN_LNK_NRELOC_OVFL ) {
2045 /* If the relocation field (a short) has overflowed, the
2046 * real count can be found in the first reloc entry.
2048 * See Section 4.1 (last para) of the PE spec (rev6.0).
2050 COFF_reloc* rel = (COFF_reloc*)
2051 myindex ( sizeof_COFF_reloc, reltab, 0 );
2052 noRelocs = rel->VirtualAddress;
2055 noRelocs = sectab_i->NumberOfRelocations;
2059 for (; j < noRelocs; j++) {
2061 COFF_reloc* rel = (COFF_reloc*)
2062 myindex ( sizeof_COFF_reloc, reltab, j );
2064 " type 0x%-4x vaddr 0x%-8x name `",
2066 rel->VirtualAddress );
2067 sym = (COFF_symbol*)
2068 myindex ( sizeof_COFF_symbol, symtab, rel->SymbolTableIndex );
2069 /* Hmm..mysterious looking offset - what's it for? SOF */
2070 printName ( sym->Name, strtab -10 );
2077 debugBelch("string table has size 0x%x\n", * (UInt32*)strtab );
2078 debugBelch("---START of string table---\n");
2079 for (i = 4; i < *(Int32*)strtab; i++) {
2081 debugBelch("\n"); else
2082 debugBelch("%c", strtab[i] );
2084 debugBelch("--- END of string table---\n");
2089 COFF_symbol* symtab_i;
2090 if (i >= (Int32)(hdr->NumberOfSymbols)) break;
2091 symtab_i = (COFF_symbol*)
2092 myindex ( sizeof_COFF_symbol, symtab, i );
2098 printName ( symtab_i->Name, strtab );
2107 (Int32)(symtab_i->SectionNumber),
2108 (UInt32)symtab_i->Type,
2109 (UInt32)symtab_i->StorageClass,
2110 (UInt32)symtab_i->NumberOfAuxSymbols
2112 i += symtab_i->NumberOfAuxSymbols;
2122 ocGetNames_PEi386 ( ObjectCode* oc )
2125 COFF_section* sectab;
2126 COFF_symbol* symtab;
2133 hdr = (COFF_header*)(oc->image);
2134 sectab = (COFF_section*) (
2135 ((UChar*)(oc->image))
2136 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2138 symtab = (COFF_symbol*) (
2139 ((UChar*)(oc->image))
2140 + hdr->PointerToSymbolTable
2142 strtab = ((UChar*)(oc->image))
2143 + hdr->PointerToSymbolTable
2144 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
2146 /* Allocate space for any (local, anonymous) .bss sections. */
2148 for (i = 0; i < hdr->NumberOfSections; i++) {
2151 COFF_section* sectab_i
2153 myindex ( sizeof_COFF_section, sectab, i );
2154 if (0 != strcmp(sectab_i->Name, ".bss")) continue;
2155 /* sof 10/05: the PE spec text isn't too clear regarding what
2156 * the SizeOfRawData field is supposed to hold for object
2157 * file sections containing just uninitialized data -- for executables,
2158 * it is supposed to be zero; unclear what it's supposed to be
2159 * for object files. However, VirtualSize is guaranteed to be
2160 * zero for object files, which definitely suggests that SizeOfRawData
2161 * will be non-zero (where else would the size of this .bss section be
2162 * stored?) Looking at the COFF_section info for incoming object files,
2163 * this certainly appears to be the case.
2165 * => I suspect we've been incorrectly handling .bss sections in (relocatable)
2166 * object files up until now. This turned out to bite us with ghc-6.4.1's use
2167 * of gcc-3.4.x, which has started to emit initially-zeroed-out local 'static'
2168 * variable decls into to the .bss section. (The specific function in Q which
2169 * triggered this is libraries/base/cbits/dirUtils.c:__hscore_getFolderPath())
2171 if (sectab_i->VirtualSize == 0 && sectab_i->SizeOfRawData == 0) continue;
2172 /* This is a non-empty .bss section. Allocate zeroed space for
2173 it, and set its PointerToRawData field such that oc->image +
2174 PointerToRawData == addr_of_zeroed_space. */
2175 bss_sz = sectab_i->VirtualSize;
2176 if ( bss_sz < sectab_i->SizeOfRawData) { bss_sz = sectab_i->SizeOfRawData; }
2177 zspace = stgCallocBytes(1, bss_sz, "ocGetNames_PEi386(anonymous bss)");
2178 sectab_i->PointerToRawData = ((UChar*)zspace) - ((UChar*)(oc->image));
2179 addProddableBlock(oc, zspace, bss_sz);
2180 /* debugBelch("BSS anon section at 0x%x\n", zspace); */
2183 /* Copy section information into the ObjectCode. */
2185 for (i = 0; i < hdr->NumberOfSections; i++) {
2191 = SECTIONKIND_OTHER;
2192 COFF_section* sectab_i
2194 myindex ( sizeof_COFF_section, sectab, i );
2195 IF_DEBUG(linker, debugBelch("section name = %s\n", sectab_i->Name ));
2198 /* I'm sure this is the Right Way to do it. However, the
2199 alternative of testing the sectab_i->Name field seems to
2200 work ok with Cygwin.
2202 if (sectab_i->Characteristics & MYIMAGE_SCN_CNT_CODE ||
2203 sectab_i->Characteristics & MYIMAGE_SCN_CNT_INITIALIZED_DATA)
2204 kind = SECTIONKIND_CODE_OR_RODATA;
2207 if (0==strcmp(".text",sectab_i->Name) ||
2208 0==strcmp(".rdata",sectab_i->Name)||
2209 0==strcmp(".rodata",sectab_i->Name))
2210 kind = SECTIONKIND_CODE_OR_RODATA;
2211 if (0==strcmp(".data",sectab_i->Name) ||
2212 0==strcmp(".bss",sectab_i->Name))
2213 kind = SECTIONKIND_RWDATA;
2215 ASSERT(sectab_i->SizeOfRawData == 0 || sectab_i->VirtualSize == 0);
2216 sz = sectab_i->SizeOfRawData;
2217 if (sz < sectab_i->VirtualSize) sz = sectab_i->VirtualSize;
2219 start = ((UChar*)(oc->image)) + sectab_i->PointerToRawData;
2220 end = start + sz - 1;
2222 if (kind == SECTIONKIND_OTHER
2223 /* Ignore sections called which contain stabs debugging
2225 && 0 != strcmp(".stab", sectab_i->Name)
2226 && 0 != strcmp(".stabstr", sectab_i->Name)
2227 /* ignore constructor section for now */
2228 && 0 != strcmp(".ctors", sectab_i->Name)
2229 /* ignore section generated from .ident */
2230 && 0!= strcmp("/4", sectab_i->Name)
2232 errorBelch("Unknown PEi386 section name `%s' (while processing: %s)", sectab_i->Name, oc->fileName);
2236 if (kind != SECTIONKIND_OTHER && end >= start) {
2237 addSection(oc, kind, start, end);
2238 addProddableBlock(oc, start, end - start + 1);
2242 /* Copy exported symbols into the ObjectCode. */
2244 oc->n_symbols = hdr->NumberOfSymbols;
2245 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
2246 "ocGetNames_PEi386(oc->symbols)");
2247 /* Call me paranoid; I don't care. */
2248 for (i = 0; i < oc->n_symbols; i++)
2249 oc->symbols[i] = NULL;
2253 COFF_symbol* symtab_i;
2254 if (i >= (Int32)(hdr->NumberOfSymbols)) break;
2255 symtab_i = (COFF_symbol*)
2256 myindex ( sizeof_COFF_symbol, symtab, i );
2260 if (symtab_i->StorageClass == MYIMAGE_SYM_CLASS_EXTERNAL
2261 && symtab_i->SectionNumber != MYIMAGE_SYM_UNDEFINED) {
2262 /* This symbol is global and defined, viz, exported */
2263 /* for MYIMAGE_SYMCLASS_EXTERNAL
2264 && !MYIMAGE_SYM_UNDEFINED,
2265 the address of the symbol is:
2266 address of relevant section + offset in section
2268 COFF_section* sectabent
2269 = (COFF_section*) myindex ( sizeof_COFF_section,
2271 symtab_i->SectionNumber-1 );
2272 addr = ((UChar*)(oc->image))
2273 + (sectabent->PointerToRawData
2277 if (symtab_i->SectionNumber == MYIMAGE_SYM_UNDEFINED
2278 && symtab_i->Value > 0) {
2279 /* This symbol isn't in any section at all, ie, global bss.
2280 Allocate zeroed space for it. */
2281 addr = stgCallocBytes(1, symtab_i->Value,
2282 "ocGetNames_PEi386(non-anonymous bss)");
2283 addSection(oc, SECTIONKIND_RWDATA, addr,
2284 ((UChar*)addr) + symtab_i->Value - 1);
2285 addProddableBlock(oc, addr, symtab_i->Value);
2286 /* debugBelch("BSS section at 0x%x\n", addr); */
2289 if (addr != NULL ) {
2290 sname = cstring_from_COFF_symbol_name ( symtab_i->Name, strtab );
2291 /* debugBelch("addSymbol %p `%s \n", addr,sname); */
2292 IF_DEBUG(linker, debugBelch("addSymbol %p `%s'\n", addr,sname);)
2293 ASSERT(i >= 0 && i < oc->n_symbols);
2294 /* cstring_from_COFF_symbol_name always succeeds. */
2295 oc->symbols[i] = sname;
2296 ghciInsertStrHashTable(oc->fileName, symhash, sname, addr);
2300 "IGNORING symbol %d\n"
2304 printName ( symtab_i->Name, strtab );
2313 (Int32)(symtab_i->SectionNumber),
2314 (UInt32)symtab_i->Type,
2315 (UInt32)symtab_i->StorageClass,
2316 (UInt32)symtab_i->NumberOfAuxSymbols
2321 i += symtab_i->NumberOfAuxSymbols;
2330 ocResolve_PEi386 ( ObjectCode* oc )
2333 COFF_section* sectab;
2334 COFF_symbol* symtab;
2344 /* ToDo: should be variable-sized? But is at least safe in the
2345 sense of buffer-overrun-proof. */
2347 /* debugBelch("resolving for %s\n", oc->fileName); */
2349 hdr = (COFF_header*)(oc->image);
2350 sectab = (COFF_section*) (
2351 ((UChar*)(oc->image))
2352 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2354 symtab = (COFF_symbol*) (
2355 ((UChar*)(oc->image))
2356 + hdr->PointerToSymbolTable
2358 strtab = ((UChar*)(oc->image))
2359 + hdr->PointerToSymbolTable
2360 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
2362 for (i = 0; i < hdr->NumberOfSections; i++) {
2363 COFF_section* sectab_i
2365 myindex ( sizeof_COFF_section, sectab, i );
2368 ((UChar*)(oc->image)) + sectab_i->PointerToRelocations
2371 /* Ignore sections called which contain stabs debugging
2373 if (0 == strcmp(".stab", sectab_i->Name)
2374 || 0 == strcmp(".stabstr", sectab_i->Name)
2375 || 0 == strcmp(".ctors", sectab_i->Name))
2378 if ( sectab_i->Characteristics & MYIMAGE_SCN_LNK_NRELOC_OVFL ) {
2379 /* If the relocation field (a short) has overflowed, the
2380 * real count can be found in the first reloc entry.
2382 * See Section 4.1 (last para) of the PE spec (rev6.0).
2384 * Nov2003 update: the GNU linker still doesn't correctly
2385 * handle the generation of relocatable object files with
2386 * overflown relocations. Hence the output to warn of potential
2389 COFF_reloc* rel = (COFF_reloc*)
2390 myindex ( sizeof_COFF_reloc, reltab, 0 );
2391 noRelocs = rel->VirtualAddress;
2393 /* 10/05: we now assume (and check for) a GNU ld that is capable
2394 * of handling object files with (>2^16) of relocs.
2397 debugBelch("WARNING: Overflown relocation field (# relocs found: %u)\n",
2402 noRelocs = sectab_i->NumberOfRelocations;
2407 for (; j < noRelocs; j++) {
2409 COFF_reloc* reltab_j
2411 myindex ( sizeof_COFF_reloc, reltab, j );
2413 /* the location to patch */
2415 ((UChar*)(oc->image))
2416 + (sectab_i->PointerToRawData
2417 + reltab_j->VirtualAddress
2418 - sectab_i->VirtualAddress )
2420 /* the existing contents of pP */
2422 /* the symbol to connect to */
2423 sym = (COFF_symbol*)
2424 myindex ( sizeof_COFF_symbol,
2425 symtab, reltab_j->SymbolTableIndex );
2428 "reloc sec %2d num %3d: type 0x%-4x "
2429 "vaddr 0x%-8x name `",
2431 (UInt32)reltab_j->Type,
2432 reltab_j->VirtualAddress );
2433 printName ( sym->Name, strtab );
2434 debugBelch("'\n" ));
2436 if (sym->StorageClass == MYIMAGE_SYM_CLASS_STATIC) {
2437 COFF_section* section_sym
2438 = findPEi386SectionCalled ( oc, sym->Name );
2440 errorBelch("%s: can't find section `%s'", oc->fileName, sym->Name);
2443 S = ((UInt32)(oc->image))
2444 + (section_sym->PointerToRawData
2447 copyName ( sym->Name, strtab, symbol, 1000-1 );
2448 S = (UInt32) lookupLocalSymbol( oc, symbol );
2449 if ((void*)S != NULL) goto foundit;
2450 S = (UInt32) lookupSymbol( symbol );
2451 if ((void*)S != NULL) goto foundit;
2452 zapTrailingAtSign ( symbol );
2453 S = (UInt32) lookupLocalSymbol( oc, symbol );
2454 if ((void*)S != NULL) goto foundit;
2455 S = (UInt32) lookupSymbol( symbol );
2456 if ((void*)S != NULL) goto foundit;
2457 /* Newline first because the interactive linker has printed "linking..." */
2458 errorBelch("\n%s: unknown symbol `%s'", oc->fileName, symbol);
2462 checkProddableBlock(oc, pP);
2463 switch (reltab_j->Type) {
2464 case MYIMAGE_REL_I386_DIR32:
2467 case MYIMAGE_REL_I386_REL32:
2468 /* Tricky. We have to insert a displacement at
2469 pP which, when added to the PC for the _next_
2470 insn, gives the address of the target (S).
2471 Problem is to know the address of the next insn
2472 when we only know pP. We assume that this
2473 literal field is always the last in the insn,
2474 so that the address of the next insn is pP+4
2475 -- hence the constant 4.
2476 Also I don't know if A should be added, but so
2477 far it has always been zero.
2479 SOF 05/2005: 'A' (old contents of *pP) have been observed
2480 to contain values other than zero (the 'wx' object file
2481 that came with wxhaskell-0.9.4; dunno how it was compiled..).
2482 So, add displacement to old value instead of asserting
2483 A to be zero. Fixes wxhaskell-related crashes, and no other
2484 ill effects have been observed.
2486 Update: the reason why we're seeing these more elaborate
2487 relocations is due to a switch in how the NCG compiles SRTs
2488 and offsets to them from info tables. SRTs live in .(ro)data,
2489 while info tables live in .text, causing GAS to emit REL32/DISP32
2490 relocations with non-zero values. Adding the displacement is
2491 the right thing to do.
2493 *pP = S - ((UInt32)pP) - 4 + A;
2496 debugBelch("%s: unhandled PEi386 relocation type %d",
2497 oc->fileName, reltab_j->Type);
2504 IF_DEBUG(linker, debugBelch("completed %s", oc->fileName));
2508 #endif /* defined(OBJFORMAT_PEi386) */
2511 /* --------------------------------------------------------------------------
2513 * ------------------------------------------------------------------------*/
2515 #if defined(OBJFORMAT_ELF)
2520 #if defined(sparc_HOST_ARCH)
2521 # define ELF_TARGET_SPARC /* Used inside <elf.h> */
2522 #elif defined(i386_HOST_ARCH)
2523 # define ELF_TARGET_386 /* Used inside <elf.h> */
2524 #elif defined(x86_64_HOST_ARCH)
2525 # define ELF_TARGET_X64_64
2527 #elif defined (ia64_HOST_ARCH)
2528 # define ELF_TARGET_IA64 /* Used inside <elf.h> */
2530 # define ELF_FUNCTION_DESC /* calling convention uses function descriptors */
2531 # define ELF_NEED_GOT /* needs Global Offset Table */
2532 # define ELF_NEED_PLT /* needs Procedure Linkage Tables */
2535 #if !defined(openbsd_HOST_OS)
2538 /* openbsd elf has things in different places, with diff names */
2539 #include <elf_abi.h>
2540 #include <machine/reloc.h>
2541 #define R_386_32 RELOC_32
2542 #define R_386_PC32 RELOC_PC32
2546 * Define a set of types which can be used for both ELF32 and ELF64
2550 #define ELFCLASS ELFCLASS64
2551 #define Elf_Addr Elf64_Addr
2552 #define Elf_Word Elf64_Word
2553 #define Elf_Sword Elf64_Sword
2554 #define Elf_Ehdr Elf64_Ehdr
2555 #define Elf_Phdr Elf64_Phdr
2556 #define Elf_Shdr Elf64_Shdr
2557 #define Elf_Sym Elf64_Sym
2558 #define Elf_Rel Elf64_Rel
2559 #define Elf_Rela Elf64_Rela
2560 #define ELF_ST_TYPE ELF64_ST_TYPE
2561 #define ELF_ST_BIND ELF64_ST_BIND
2562 #define ELF_R_TYPE ELF64_R_TYPE
2563 #define ELF_R_SYM ELF64_R_SYM
2565 #define ELFCLASS ELFCLASS32
2566 #define Elf_Addr Elf32_Addr
2567 #define Elf_Word Elf32_Word
2568 #define Elf_Sword Elf32_Sword
2569 #define Elf_Ehdr Elf32_Ehdr
2570 #define Elf_Phdr Elf32_Phdr
2571 #define Elf_Shdr Elf32_Shdr
2572 #define Elf_Sym Elf32_Sym
2573 #define Elf_Rel Elf32_Rel
2574 #define Elf_Rela Elf32_Rela
2576 #define ELF_ST_TYPE ELF32_ST_TYPE
2579 #define ELF_ST_BIND ELF32_ST_BIND
2582 #define ELF_R_TYPE ELF32_R_TYPE
2585 #define ELF_R_SYM ELF32_R_SYM
2591 * Functions to allocate entries in dynamic sections. Currently we simply
2592 * preallocate a large number, and we don't check if a entry for the given
2593 * target already exists (a linear search is too slow). Ideally these
2594 * entries would be associated with symbols.
2597 /* These sizes sufficient to load HSbase + HShaskell98 + a few modules */
2598 #define GOT_SIZE 0x20000
2599 #define FUNCTION_TABLE_SIZE 0x10000
2600 #define PLT_SIZE 0x08000
2603 static Elf_Addr got[GOT_SIZE];
2604 static unsigned int gotIndex;
2605 static Elf_Addr gp_val = (Elf_Addr)got;
2608 allocateGOTEntry(Elf_Addr target)
2612 if (gotIndex >= GOT_SIZE)
2613 barf("Global offset table overflow");
2615 entry = &got[gotIndex++];
2617 return (Elf_Addr)entry;
2621 #ifdef ELF_FUNCTION_DESC
2627 static FunctionDesc functionTable[FUNCTION_TABLE_SIZE];
2628 static unsigned int functionTableIndex;
2631 allocateFunctionDesc(Elf_Addr target)
2633 FunctionDesc *entry;
2635 if (functionTableIndex >= FUNCTION_TABLE_SIZE)
2636 barf("Function table overflow");
2638 entry = &functionTable[functionTableIndex++];
2640 entry->gp = (Elf_Addr)gp_val;
2641 return (Elf_Addr)entry;
2645 copyFunctionDesc(Elf_Addr target)
2647 FunctionDesc *olddesc = (FunctionDesc *)target;
2648 FunctionDesc *newdesc;
2650 newdesc = (FunctionDesc *)allocateFunctionDesc(olddesc->ip);
2651 newdesc->gp = olddesc->gp;
2652 return (Elf_Addr)newdesc;
2657 #ifdef ia64_HOST_ARCH
2658 static void ia64_reloc_gprel22(Elf_Addr target, Elf_Addr value);
2659 static void ia64_reloc_pcrel21(Elf_Addr target, Elf_Addr value, ObjectCode *oc);
2661 static unsigned char plt_code[] =
2663 /* taken from binutils bfd/elfxx-ia64.c */
2664 0x0b, 0x78, 0x00, 0x02, 0x00, 0x24, /* [MMI] addl r15=0,r1;; */
2665 0x00, 0x41, 0x3c, 0x30, 0x28, 0xc0, /* ld8 r16=[r15],8 */
2666 0x01, 0x08, 0x00, 0x84, /* mov r14=r1;; */
2667 0x11, 0x08, 0x00, 0x1e, 0x18, 0x10, /* [MIB] ld8 r1=[r15] */
2668 0x60, 0x80, 0x04, 0x80, 0x03, 0x00, /* mov b6=r16 */
2669 0x60, 0x00, 0x80, 0x00 /* br.few b6;; */
2672 /* If we can't get to the function descriptor via gp, take a local copy of it */
2673 #define PLT_RELOC(code, target) { \
2674 Elf64_Sxword rel_value = target - gp_val; \
2675 if ((rel_value > 0x1fffff) || (rel_value < -0x1fffff)) \
2676 ia64_reloc_gprel22((Elf_Addr)code, copyFunctionDesc(target)); \
2678 ia64_reloc_gprel22((Elf_Addr)code, target); \
2683 unsigned char code[sizeof(plt_code)];
2687 allocatePLTEntry(Elf_Addr target, ObjectCode *oc)
2689 PLTEntry *plt = (PLTEntry *)oc->plt;
2692 if (oc->pltIndex >= PLT_SIZE)
2693 barf("Procedure table overflow");
2695 entry = &plt[oc->pltIndex++];
2696 memcpy(entry->code, plt_code, sizeof(entry->code));
2697 PLT_RELOC(entry->code, target);
2698 return (Elf_Addr)entry;
2704 return (PLT_SIZE * sizeof(PLTEntry));
2709 #if x86_64_HOST_ARCH
2710 // On x86_64, 32-bit relocations are often used, which requires that
2711 // we can resolve a symbol to a 32-bit offset. However, shared
2712 // libraries are placed outside the 2Gb area, which leaves us with a
2713 // problem when we need to give a 32-bit offset to a symbol in a
2716 // For a function symbol, we can allocate a bounce sequence inside the
2717 // 2Gb area and resolve the symbol to this. The bounce sequence is
2718 // simply a long jump instruction to the real location of the symbol.
2720 // For data references, we're screwed.
2723 unsigned char jmp[8]; /* 6 byte instruction: jmpq *0x00000002(%rip) */
2727 #define X86_64_BB_SIZE 1024
2729 static x86_64_bounce *x86_64_bounce_buffer = NULL;
2730 static nat x86_64_bb_next_off;
2733 x86_64_high_symbol( char *lbl, void *addr )
2735 x86_64_bounce *bounce;
2737 if ( x86_64_bounce_buffer == NULL ||
2738 x86_64_bb_next_off >= X86_64_BB_SIZE ) {
2739 x86_64_bounce_buffer =
2740 mmap(NULL, X86_64_BB_SIZE * sizeof(x86_64_bounce),
2741 PROT_EXEC|PROT_READ|PROT_WRITE,
2742 MAP_PRIVATE|MAP_32BIT|MAP_ANONYMOUS, -1, 0);
2743 if (x86_64_bounce_buffer == MAP_FAILED) {
2744 barf("x86_64_high_symbol: mmap failed");
2746 x86_64_bb_next_off = 0;
2748 bounce = &x86_64_bounce_buffer[x86_64_bb_next_off];
2749 bounce->jmp[0] = 0xff;
2750 bounce->jmp[1] = 0x25;
2751 bounce->jmp[2] = 0x02;
2752 bounce->jmp[3] = 0x00;
2753 bounce->jmp[4] = 0x00;
2754 bounce->jmp[5] = 0x00;
2755 bounce->addr = addr;
2756 x86_64_bb_next_off++;
2758 IF_DEBUG(linker, debugBelch("x86_64: allocated bounce entry for %s->%p at %p\n",
2759 lbl, addr, bounce));
2761 insertStrHashTable(symhash, lbl, bounce);
2768 * Generic ELF functions
2772 findElfSection ( void* objImage, Elf_Word sh_type )
2774 char* ehdrC = (char*)objImage;
2775 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2776 Elf_Shdr* shdr = (Elf_Shdr*)(ehdrC + ehdr->e_shoff);
2777 char* sh_strtab = ehdrC + shdr[ehdr->e_shstrndx].sh_offset;
2781 for (i = 0; i < ehdr->e_shnum; i++) {
2782 if (shdr[i].sh_type == sh_type
2783 /* Ignore the section header's string table. */
2784 && i != ehdr->e_shstrndx
2785 /* Ignore string tables named .stabstr, as they contain
2787 && 0 != memcmp(".stabstr", sh_strtab + shdr[i].sh_name, 8)
2789 ptr = ehdrC + shdr[i].sh_offset;
2796 #if defined(ia64_HOST_ARCH)
2798 findElfSegment ( void* objImage, Elf_Addr vaddr )
2800 char* ehdrC = (char*)objImage;
2801 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2802 Elf_Phdr* phdr = (Elf_Phdr*)(ehdrC + ehdr->e_phoff);
2803 Elf_Addr segaddr = 0;
2806 for (i = 0; i < ehdr->e_phnum; i++) {
2807 segaddr = phdr[i].p_vaddr;
2808 if ((vaddr >= segaddr) && (vaddr < segaddr + phdr[i].p_memsz))
2816 ocVerifyImage_ELF ( ObjectCode* oc )
2820 int i, j, nent, nstrtab, nsymtabs;
2824 char* ehdrC = (char*)(oc->image);
2825 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2827 if (ehdr->e_ident[EI_MAG0] != ELFMAG0 ||
2828 ehdr->e_ident[EI_MAG1] != ELFMAG1 ||
2829 ehdr->e_ident[EI_MAG2] != ELFMAG2 ||
2830 ehdr->e_ident[EI_MAG3] != ELFMAG3) {
2831 errorBelch("%s: not an ELF object", oc->fileName);
2835 if (ehdr->e_ident[EI_CLASS] != ELFCLASS) {
2836 errorBelch("%s: unsupported ELF format", oc->fileName);
2840 if (ehdr->e_ident[EI_DATA] == ELFDATA2LSB) {
2841 IF_DEBUG(linker,debugBelch( "Is little-endian\n" ));
2843 if (ehdr->e_ident[EI_DATA] == ELFDATA2MSB) {
2844 IF_DEBUG(linker,debugBelch( "Is big-endian\n" ));
2846 errorBelch("%s: unknown endiannness", oc->fileName);
2850 if (ehdr->e_type != ET_REL) {
2851 errorBelch("%s: not a relocatable object (.o) file", oc->fileName);
2854 IF_DEBUG(linker, debugBelch( "Is a relocatable object (.o) file\n" ));
2856 IF_DEBUG(linker,debugBelch( "Architecture is " ));
2857 switch (ehdr->e_machine) {
2858 case EM_386: IF_DEBUG(linker,debugBelch( "x86" )); break;
2859 #ifdef EM_SPARC32PLUS
2860 case EM_SPARC32PLUS:
2862 case EM_SPARC: IF_DEBUG(linker,debugBelch( "sparc" )); break;
2864 case EM_IA_64: IF_DEBUG(linker,debugBelch( "ia64" )); break;
2866 case EM_PPC: IF_DEBUG(linker,debugBelch( "powerpc32" )); break;
2868 case EM_X86_64: IF_DEBUG(linker,debugBelch( "x86_64" )); break;
2870 default: IF_DEBUG(linker,debugBelch( "unknown" ));
2871 errorBelch("%s: unknown architecture", oc->fileName);
2875 IF_DEBUG(linker,debugBelch(
2876 "\nSection header table: start %ld, n_entries %d, ent_size %d\n",
2877 (long)ehdr->e_shoff, ehdr->e_shnum, ehdr->e_shentsize ));
2879 ASSERT (ehdr->e_shentsize == sizeof(Elf_Shdr));
2881 shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
2883 if (ehdr->e_shstrndx == SHN_UNDEF) {
2884 errorBelch("%s: no section header string table", oc->fileName);
2887 IF_DEBUG(linker,debugBelch( "Section header string table is section %d\n",
2889 sh_strtab = ehdrC + shdr[ehdr->e_shstrndx].sh_offset;
2892 for (i = 0; i < ehdr->e_shnum; i++) {
2893 IF_DEBUG(linker,debugBelch("%2d: ", i ));
2894 IF_DEBUG(linker,debugBelch("type=%2d ", (int)shdr[i].sh_type ));
2895 IF_DEBUG(linker,debugBelch("size=%4d ", (int)shdr[i].sh_size ));
2896 IF_DEBUG(linker,debugBelch("offs=%4d ", (int)shdr[i].sh_offset ));
2897 IF_DEBUG(linker,debugBelch(" (%p .. %p) ",
2898 ehdrC + shdr[i].sh_offset,
2899 ehdrC + shdr[i].sh_offset + shdr[i].sh_size - 1));
2901 if (shdr[i].sh_type == SHT_REL) {
2902 IF_DEBUG(linker,debugBelch("Rel " ));
2903 } else if (shdr[i].sh_type == SHT_RELA) {
2904 IF_DEBUG(linker,debugBelch("RelA " ));
2906 IF_DEBUG(linker,debugBelch(" "));
2909 IF_DEBUG(linker,debugBelch("sname=%s\n", sh_strtab + shdr[i].sh_name ));
2913 IF_DEBUG(linker,debugBelch( "\nString tables" ));
2916 for (i = 0; i < ehdr->e_shnum; i++) {
2917 if (shdr[i].sh_type == SHT_STRTAB
2918 /* Ignore the section header's string table. */
2919 && i != ehdr->e_shstrndx
2920 /* Ignore string tables named .stabstr, as they contain
2922 && 0 != memcmp(".stabstr", sh_strtab + shdr[i].sh_name, 8)
2924 IF_DEBUG(linker,debugBelch(" section %d is a normal string table", i ));
2925 strtab = ehdrC + shdr[i].sh_offset;
2930 errorBelch("%s: no string tables, or too many", oc->fileName);
2935 IF_DEBUG(linker,debugBelch( "\nSymbol tables" ));
2936 for (i = 0; i < ehdr->e_shnum; i++) {
2937 if (shdr[i].sh_type != SHT_SYMTAB) continue;
2938 IF_DEBUG(linker,debugBelch( "section %d is a symbol table\n", i ));
2940 stab = (Elf_Sym*) (ehdrC + shdr[i].sh_offset);
2941 nent = shdr[i].sh_size / sizeof(Elf_Sym);
2942 IF_DEBUG(linker,debugBelch( " number of entries is apparently %d (%ld rem)\n",
2944 (long)shdr[i].sh_size % sizeof(Elf_Sym)
2946 if (0 != shdr[i].sh_size % sizeof(Elf_Sym)) {
2947 errorBelch("%s: non-integral number of symbol table entries", oc->fileName);
2950 for (j = 0; j < nent; j++) {
2951 IF_DEBUG(linker,debugBelch(" %2d ", j ));
2952 IF_DEBUG(linker,debugBelch(" sec=%-5d size=%-3d val=%5p ",
2953 (int)stab[j].st_shndx,
2954 (int)stab[j].st_size,
2955 (char*)stab[j].st_value ));
2957 IF_DEBUG(linker,debugBelch("type=" ));
2958 switch (ELF_ST_TYPE(stab[j].st_info)) {
2959 case STT_NOTYPE: IF_DEBUG(linker,debugBelch("notype " )); break;
2960 case STT_OBJECT: IF_DEBUG(linker,debugBelch("object " )); break;
2961 case STT_FUNC : IF_DEBUG(linker,debugBelch("func " )); break;
2962 case STT_SECTION: IF_DEBUG(linker,debugBelch("section" )); break;
2963 case STT_FILE: IF_DEBUG(linker,debugBelch("file " )); break;
2964 default: IF_DEBUG(linker,debugBelch("? " )); break;
2966 IF_DEBUG(linker,debugBelch(" " ));
2968 IF_DEBUG(linker,debugBelch("bind=" ));
2969 switch (ELF_ST_BIND(stab[j].st_info)) {
2970 case STB_LOCAL : IF_DEBUG(linker,debugBelch("local " )); break;
2971 case STB_GLOBAL: IF_DEBUG(linker,debugBelch("global" )); break;
2972 case STB_WEAK : IF_DEBUG(linker,debugBelch("weak " )); break;
2973 default: IF_DEBUG(linker,debugBelch("? " )); break;
2975 IF_DEBUG(linker,debugBelch(" " ));
2977 IF_DEBUG(linker,debugBelch("name=%s\n", strtab + stab[j].st_name ));
2981 if (nsymtabs == 0) {
2982 errorBelch("%s: didn't find any symbol tables", oc->fileName);
2989 static int getSectionKind_ELF( Elf_Shdr *hdr, int *is_bss )
2993 if (hdr->sh_type == SHT_PROGBITS
2994 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_EXECINSTR)) {
2995 /* .text-style section */
2996 return SECTIONKIND_CODE_OR_RODATA;
2999 if (hdr->sh_type == SHT_PROGBITS
3000 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_WRITE)) {
3001 /* .data-style section */
3002 return SECTIONKIND_RWDATA;
3005 if (hdr->sh_type == SHT_PROGBITS
3006 && (hdr->sh_flags & SHF_ALLOC) && !(hdr->sh_flags & SHF_WRITE)) {
3007 /* .rodata-style section */
3008 return SECTIONKIND_CODE_OR_RODATA;
3011 if (hdr->sh_type == SHT_NOBITS
3012 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_WRITE)) {
3013 /* .bss-style section */
3015 return SECTIONKIND_RWDATA;
3018 return SECTIONKIND_OTHER;
3023 ocGetNames_ELF ( ObjectCode* oc )
3028 char* ehdrC = (char*)(oc->image);
3029 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
3030 char* strtab = findElfSection ( ehdrC, SHT_STRTAB );
3031 Elf_Shdr* shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
3033 ASSERT(symhash != NULL);
3036 errorBelch("%s: no strtab", oc->fileName);
3041 for (i = 0; i < ehdr->e_shnum; i++) {
3042 /* Figure out what kind of section it is. Logic derived from
3043 Figure 1.14 ("Special Sections") of the ELF document
3044 ("Portable Formats Specification, Version 1.1"). */
3046 SectionKind kind = getSectionKind_ELF(&shdr[i], &is_bss);
3048 if (is_bss && shdr[i].sh_size > 0) {
3049 /* This is a non-empty .bss section. Allocate zeroed space for
3050 it, and set its .sh_offset field such that
3051 ehdrC + .sh_offset == addr_of_zeroed_space. */
3052 char* zspace = stgCallocBytes(1, shdr[i].sh_size,
3053 "ocGetNames_ELF(BSS)");
3054 shdr[i].sh_offset = ((char*)zspace) - ((char*)ehdrC);
3056 debugBelch("BSS section at 0x%x, size %d\n",
3057 zspace, shdr[i].sh_size);
3061 /* fill in the section info */
3062 if (kind != SECTIONKIND_OTHER && shdr[i].sh_size > 0) {
3063 addProddableBlock(oc, ehdrC + shdr[i].sh_offset, shdr[i].sh_size);
3064 addSection(oc, kind, ehdrC + shdr[i].sh_offset,
3065 ehdrC + shdr[i].sh_offset + shdr[i].sh_size - 1);
3068 if (shdr[i].sh_type != SHT_SYMTAB) continue;
3070 /* copy stuff into this module's object symbol table */
3071 stab = (Elf_Sym*) (ehdrC + shdr[i].sh_offset);
3072 nent = shdr[i].sh_size / sizeof(Elf_Sym);
3074 oc->n_symbols = nent;
3075 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
3076 "ocGetNames_ELF(oc->symbols)");
3078 for (j = 0; j < nent; j++) {
3080 char isLocal = FALSE; /* avoids uninit-var warning */
3082 char* nm = strtab + stab[j].st_name;
3083 int secno = stab[j].st_shndx;
3085 /* Figure out if we want to add it; if so, set ad to its
3086 address. Otherwise leave ad == NULL. */
3088 if (secno == SHN_COMMON) {
3090 ad = stgCallocBytes(1, stab[j].st_size, "ocGetNames_ELF(COMMON)");
3092 debugBelch("COMMON symbol, size %d name %s\n",
3093 stab[j].st_size, nm);
3095 /* Pointless to do addProddableBlock() for this area,
3096 since the linker should never poke around in it. */
3099 if ( ( ELF_ST_BIND(stab[j].st_info)==STB_GLOBAL
3100 || ELF_ST_BIND(stab[j].st_info)==STB_LOCAL
3102 /* and not an undefined symbol */
3103 && stab[j].st_shndx != SHN_UNDEF
3104 /* and not in a "special section" */
3105 && stab[j].st_shndx < SHN_LORESERVE
3107 /* and it's a not a section or string table or anything silly */
3108 ( ELF_ST_TYPE(stab[j].st_info)==STT_FUNC ||
3109 ELF_ST_TYPE(stab[j].st_info)==STT_OBJECT ||
3110 ELF_ST_TYPE(stab[j].st_info)==STT_NOTYPE
3113 /* Section 0 is the undefined section, hence > and not >=. */
3114 ASSERT(secno > 0 && secno < ehdr->e_shnum);
3116 if (shdr[secno].sh_type == SHT_NOBITS) {
3117 debugBelch(" BSS symbol, size %d off %d name %s\n",
3118 stab[j].st_size, stab[j].st_value, nm);
3121 ad = ehdrC + shdr[ secno ].sh_offset + stab[j].st_value;
3122 if (ELF_ST_BIND(stab[j].st_info)==STB_LOCAL) {
3125 #ifdef ELF_FUNCTION_DESC
3126 /* dlsym() and the initialisation table both give us function
3127 * descriptors, so to be consistent we store function descriptors
3128 * in the symbol table */
3129 if (ELF_ST_TYPE(stab[j].st_info) == STT_FUNC)
3130 ad = (char *)allocateFunctionDesc((Elf_Addr)ad);
3132 IF_DEBUG(linker,debugBelch( "addOTabName(GLOB): %10p %s %s",
3133 ad, oc->fileName, nm ));
3138 /* And the decision is ... */
3142 oc->symbols[j] = nm;
3145 /* Ignore entirely. */
3147 ghciInsertStrHashTable(oc->fileName, symhash, nm, ad);
3151 IF_DEBUG(linker,debugBelch( "skipping `%s'\n",
3152 strtab + stab[j].st_name ));
3155 "skipping bind = %d, type = %d, shndx = %d `%s'\n",
3156 (int)ELF_ST_BIND(stab[j].st_info),
3157 (int)ELF_ST_TYPE(stab[j].st_info),
3158 (int)stab[j].st_shndx,
3159 strtab + stab[j].st_name
3162 oc->symbols[j] = NULL;
3171 /* Do ELF relocations which lack an explicit addend. All x86-linux
3172 relocations appear to be of this form. */
3174 do_Elf_Rel_relocations ( ObjectCode* oc, char* ehdrC,
3175 Elf_Shdr* shdr, int shnum,
3176 Elf_Sym* stab, char* strtab )
3181 Elf_Rel* rtab = (Elf_Rel*) (ehdrC + shdr[shnum].sh_offset);
3182 int nent = shdr[shnum].sh_size / sizeof(Elf_Rel);
3183 int target_shndx = shdr[shnum].sh_info;
3184 int symtab_shndx = shdr[shnum].sh_link;
3186 stab = (Elf_Sym*) (ehdrC + shdr[ symtab_shndx ].sh_offset);
3187 targ = (Elf_Word*)(ehdrC + shdr[ target_shndx ].sh_offset);
3188 IF_DEBUG(linker,debugBelch( "relocations for section %d using symtab %d\n",
3189 target_shndx, symtab_shndx ));
3191 /* Skip sections that we're not interested in. */
3194 SectionKind kind = getSectionKind_ELF(&shdr[target_shndx], &is_bss);
3195 if (kind == SECTIONKIND_OTHER) {
3196 IF_DEBUG(linker,debugBelch( "skipping (target section not loaded)"));
3201 for (j = 0; j < nent; j++) {
3202 Elf_Addr offset = rtab[j].r_offset;
3203 Elf_Addr info = rtab[j].r_info;
3205 Elf_Addr P = ((Elf_Addr)targ) + offset;
3206 Elf_Word* pP = (Elf_Word*)P;
3211 StgStablePtr stablePtr;
3214 IF_DEBUG(linker,debugBelch( "Rel entry %3d is raw(%6p %6p)",
3215 j, (void*)offset, (void*)info ));
3217 IF_DEBUG(linker,debugBelch( " ZERO" ));
3220 Elf_Sym sym = stab[ELF_R_SYM(info)];
3221 /* First see if it is a local symbol. */
3222 if (ELF_ST_BIND(sym.st_info) == STB_LOCAL) {
3223 /* Yes, so we can get the address directly from the ELF symbol
3225 symbol = sym.st_name==0 ? "(noname)" : strtab+sym.st_name;
3227 (ehdrC + shdr[ sym.st_shndx ].sh_offset
3228 + stab[ELF_R_SYM(info)].st_value);
3231 symbol = strtab + sym.st_name;
3232 stablePtr = (StgStablePtr)lookupHashTable(stablehash, (StgWord)symbol);
3233 if (NULL == stablePtr) {
3234 /* No, so look up the name in our global table. */
3235 S_tmp = lookupSymbol( symbol );
3236 S = (Elf_Addr)S_tmp;
3238 stableVal = deRefStablePtr( stablePtr );
3240 S = (Elf_Addr)S_tmp;
3244 errorBelch("%s: unknown symbol `%s'", oc->fileName, symbol);
3247 IF_DEBUG(linker,debugBelch( "`%s' resolves to %p\n", symbol, (void*)S ));
3250 IF_DEBUG(linker,debugBelch( "Reloc: P = %p S = %p A = %p\n",
3251 (void*)P, (void*)S, (void*)A ));
3252 checkProddableBlock ( oc, pP );
3256 switch (ELF_R_TYPE(info)) {
3257 # ifdef i386_HOST_ARCH
3258 case R_386_32: *pP = value; break;
3259 case R_386_PC32: *pP = value - P; break;
3262 errorBelch("%s: unhandled ELF relocation(Rel) type %lu\n",
3263 oc->fileName, (lnat)ELF_R_TYPE(info));
3271 /* Do ELF relocations for which explicit addends are supplied.
3272 sparc-solaris relocations appear to be of this form. */
3274 do_Elf_Rela_relocations ( ObjectCode* oc, char* ehdrC,
3275 Elf_Shdr* shdr, int shnum,
3276 Elf_Sym* stab, char* strtab )
3279 char *symbol = NULL;
3281 Elf_Rela* rtab = (Elf_Rela*) (ehdrC + shdr[shnum].sh_offset);
3282 int nent = shdr[shnum].sh_size / sizeof(Elf_Rela);
3283 int target_shndx = shdr[shnum].sh_info;
3284 int symtab_shndx = shdr[shnum].sh_link;
3286 stab = (Elf_Sym*) (ehdrC + shdr[ symtab_shndx ].sh_offset);
3287 targ = (Elf_Addr) (ehdrC + shdr[ target_shndx ].sh_offset);
3288 IF_DEBUG(linker,debugBelch( "relocations for section %d using symtab %d\n",
3289 target_shndx, symtab_shndx ));
3291 for (j = 0; j < nent; j++) {
3292 #if defined(DEBUG) || defined(sparc_HOST_ARCH) || defined(ia64_HOST_ARCH) || defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH)
3293 /* This #ifdef only serves to avoid unused-var warnings. */
3294 Elf_Addr offset = rtab[j].r_offset;
3295 Elf_Addr P = targ + offset;
3297 Elf_Addr info = rtab[j].r_info;
3298 Elf_Addr A = rtab[j].r_addend;
3302 # if defined(sparc_HOST_ARCH)
3303 Elf_Word* pP = (Elf_Word*)P;
3305 # elif defined(ia64_HOST_ARCH)
3306 Elf64_Xword *pP = (Elf64_Xword *)P;
3308 # elif defined(powerpc_HOST_ARCH)
3312 IF_DEBUG(linker,debugBelch( "Rel entry %3d is raw(%6p %6p %6p) ",
3313 j, (void*)offset, (void*)info,
3316 IF_DEBUG(linker,debugBelch( " ZERO" ));
3319 Elf_Sym sym = stab[ELF_R_SYM(info)];
3320 /* First see if it is a local symbol. */
3321 if (ELF_ST_BIND(sym.st_info) == STB_LOCAL) {
3322 /* Yes, so we can get the address directly from the ELF symbol
3324 symbol = sym.st_name==0 ? "(noname)" : strtab+sym.st_name;
3326 (ehdrC + shdr[ sym.st_shndx ].sh_offset
3327 + stab[ELF_R_SYM(info)].st_value);
3328 #ifdef ELF_FUNCTION_DESC
3329 /* Make a function descriptor for this function */
3330 if (S && ELF_ST_TYPE(sym.st_info) == STT_FUNC) {
3331 S = allocateFunctionDesc(S + A);
3336 /* No, so look up the name in our global table. */
3337 symbol = strtab + sym.st_name;
3338 S_tmp = lookupSymbol( symbol );
3339 S = (Elf_Addr)S_tmp;
3341 #ifdef ELF_FUNCTION_DESC
3342 /* If a function, already a function descriptor - we would
3343 have to copy it to add an offset. */
3344 if (S && (ELF_ST_TYPE(sym.st_info) == STT_FUNC) && (A != 0))
3345 errorBelch("%s: function %s with addend %p", oc->fileName, symbol, (void *)A);
3349 errorBelch("%s: unknown symbol `%s'", oc->fileName, symbol);
3352 IF_DEBUG(linker,debugBelch( "`%s' resolves to %p", symbol, (void*)S ));
3355 IF_DEBUG(linker,debugBelch("Reloc: P = %p S = %p A = %p\n",
3356 (void*)P, (void*)S, (void*)A ));
3357 /* checkProddableBlock ( oc, (void*)P ); */
3361 switch (ELF_R_TYPE(info)) {
3362 # if defined(sparc_HOST_ARCH)
3363 case R_SPARC_WDISP30:
3364 w1 = *pP & 0xC0000000;
3365 w2 = (Elf_Word)((value - P) >> 2);
3366 ASSERT((w2 & 0xC0000000) == 0);
3371 w1 = *pP & 0xFFC00000;
3372 w2 = (Elf_Word)(value >> 10);
3373 ASSERT((w2 & 0xFFC00000) == 0);
3379 w2 = (Elf_Word)(value & 0x3FF);
3380 ASSERT((w2 & ~0x3FF) == 0);
3384 /* According to the Sun documentation:
3386 This relocation type resembles R_SPARC_32, except it refers to an
3387 unaligned word. That is, the word to be relocated must be treated
3388 as four separate bytes with arbitrary alignment, not as a word
3389 aligned according to the architecture requirements.
3391 (JRS: which means that freeloading on the R_SPARC_32 case
3392 is probably wrong, but hey ...)
3396 w2 = (Elf_Word)value;
3399 # elif defined(ia64_HOST_ARCH)
3400 case R_IA64_DIR64LSB:
3401 case R_IA64_FPTR64LSB:
3404 case R_IA64_PCREL64LSB:
3407 case R_IA64_SEGREL64LSB:
3408 addr = findElfSegment(ehdrC, value);
3411 case R_IA64_GPREL22:
3412 ia64_reloc_gprel22(P, value);
3414 case R_IA64_LTOFF22:
3415 case R_IA64_LTOFF22X:
3416 case R_IA64_LTOFF_FPTR22:
3417 addr = allocateGOTEntry(value);
3418 ia64_reloc_gprel22(P, addr);
3420 case R_IA64_PCREL21B:
3421 ia64_reloc_pcrel21(P, S, oc);
3424 /* This goes with R_IA64_LTOFF22X and points to the load to
3425 * convert into a move. We don't implement relaxation. */
3427 # elif defined(powerpc_HOST_ARCH)
3428 case R_PPC_ADDR16_LO:
3429 *(Elf32_Half*) P = value;
3432 case R_PPC_ADDR16_HI:
3433 *(Elf32_Half*) P = value >> 16;
3436 case R_PPC_ADDR16_HA:
3437 *(Elf32_Half*) P = (value + 0x8000) >> 16;
3441 *(Elf32_Word *) P = value;
3445 *(Elf32_Word *) P = value - P;
3451 if( delta << 6 >> 6 != delta )
3453 value = makeJumpIsland( oc, ELF_R_SYM(info), value );
3456 if( value == 0 || delta << 6 >> 6 != delta )
3458 barf( "Unable to make ppcJumpIsland for #%d",
3464 *(Elf_Word *) P = (*(Elf_Word *) P & 0xfc000003)
3465 | (delta & 0x3fffffc);
3469 #if x86_64_HOST_ARCH
3471 *(Elf64_Xword *)P = value;
3476 StgInt64 off = value - P;
3477 if (off >= 0x7fffffffL || off < -0x80000000L) {
3478 barf("R_X86_64_PC32 relocation out of range: %s = %p",
3481 *(Elf64_Word *)P = (Elf64_Word)off;
3486 if (value >= 0x7fffffffL) {
3487 barf("R_X86_64_32 relocation out of range: %s = %p\n",
3490 *(Elf64_Word *)P = (Elf64_Word)value;
3494 if ((StgInt64)value > 0x7fffffffL || (StgInt64)value < -0x80000000L) {
3495 barf("R_X86_64_32S relocation out of range: %s = %p\n",
3498 *(Elf64_Sword *)P = (Elf64_Sword)value;
3503 errorBelch("%s: unhandled ELF relocation(RelA) type %lu\n",
3504 oc->fileName, (lnat)ELF_R_TYPE(info));
3513 ocResolve_ELF ( ObjectCode* oc )
3517 Elf_Sym* stab = NULL;
3518 char* ehdrC = (char*)(oc->image);
3519 Elf_Ehdr* ehdr = (Elf_Ehdr*) ehdrC;
3520 Elf_Shdr* shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
3522 /* first find "the" symbol table */
3523 stab = (Elf_Sym*) findElfSection ( ehdrC, SHT_SYMTAB );
3525 /* also go find the string table */
3526 strtab = findElfSection ( ehdrC, SHT_STRTAB );
3528 if (stab == NULL || strtab == NULL) {
3529 errorBelch("%s: can't find string or symbol table", oc->fileName);
3533 /* Process the relocation sections. */
3534 for (shnum = 0; shnum < ehdr->e_shnum; shnum++) {
3535 if (shdr[shnum].sh_type == SHT_REL) {
3536 ok = do_Elf_Rel_relocations ( oc, ehdrC, shdr,
3537 shnum, stab, strtab );
3541 if (shdr[shnum].sh_type == SHT_RELA) {
3542 ok = do_Elf_Rela_relocations ( oc, ehdrC, shdr,
3543 shnum, stab, strtab );
3548 /* Free the local symbol table; we won't need it again. */
3549 freeHashTable(oc->lochash, NULL);
3552 #if defined(powerpc_HOST_ARCH)
3553 ocFlushInstructionCache( oc );
3561 * Instructions are 41 bits long, packed into 128 bit bundles with a 5-bit template
3562 * at the front. The following utility functions pack and unpack instructions, and
3563 * take care of the most common relocations.
3566 #ifdef ia64_HOST_ARCH
3569 ia64_extract_instruction(Elf64_Xword *target)
3572 int slot = (Elf_Addr)target & 3;
3573 target = (Elf_Addr)target & ~3;
3581 return ((w1 >> 5) & 0x1ffffffffff);
3583 return (w1 >> 46) | ((w2 & 0x7fffff) << 18);
3587 barf("ia64_extract_instruction: invalid slot %p", target);
3592 ia64_deposit_instruction(Elf64_Xword *target, Elf64_Xword value)
3594 int slot = (Elf_Addr)target & 3;
3595 target = (Elf_Addr)target & ~3;
3600 *target |= value << 5;
3603 *target |= value << 46;
3604 *(target+1) |= value >> 18;
3607 *(target+1) |= value << 23;
3613 ia64_reloc_gprel22(Elf_Addr target, Elf_Addr value)
3615 Elf64_Xword instruction;
3616 Elf64_Sxword rel_value;
3618 rel_value = value - gp_val;
3619 if ((rel_value > 0x1fffff) || (rel_value < -0x1fffff))
3620 barf("GP-relative data out of range (address = 0x%lx, gp = 0x%lx)", value, gp_val);
3622 instruction = ia64_extract_instruction((Elf64_Xword *)target);
3623 instruction |= (((rel_value >> 0) & 0x07f) << 13) /* imm7b */
3624 | (((rel_value >> 7) & 0x1ff) << 27) /* imm9d */
3625 | (((rel_value >> 16) & 0x01f) << 22) /* imm5c */
3626 | ((Elf64_Xword)(rel_value < 0) << 36); /* s */
3627 ia64_deposit_instruction((Elf64_Xword *)target, instruction);
3631 ia64_reloc_pcrel21(Elf_Addr target, Elf_Addr value, ObjectCode *oc)
3633 Elf64_Xword instruction;
3634 Elf64_Sxword rel_value;
3637 entry = allocatePLTEntry(value, oc);
3639 rel_value = (entry >> 4) - (target >> 4);
3640 if ((rel_value > 0xfffff) || (rel_value < -0xfffff))
3641 barf("PLT entry too far away (entry = 0x%lx, target = 0x%lx)", entry, target);
3643 instruction = ia64_extract_instruction((Elf64_Xword *)target);
3644 instruction |= ((rel_value & 0xfffff) << 13) /* imm20b */
3645 | ((Elf64_Xword)(rel_value < 0) << 36); /* s */
3646 ia64_deposit_instruction((Elf64_Xword *)target, instruction);
3652 * PowerPC ELF specifics
3655 #ifdef powerpc_HOST_ARCH
3657 static int ocAllocateJumpIslands_ELF( ObjectCode *oc )
3663 ehdr = (Elf_Ehdr *) oc->image;
3664 shdr = (Elf_Shdr *) ( ((char *)oc->image) + ehdr->e_shoff );
3666 for( i = 0; i < ehdr->e_shnum; i++ )
3667 if( shdr[i].sh_type == SHT_SYMTAB )
3670 if( i == ehdr->e_shnum )
3672 errorBelch( "This ELF file contains no symtab" );
3676 if( shdr[i].sh_entsize != sizeof( Elf_Sym ) )
3678 errorBelch( "The entry size (%d) of the symtab isn't %d\n",
3679 shdr[i].sh_entsize, sizeof( Elf_Sym ) );
3684 return ocAllocateJumpIslands( oc, shdr[i].sh_size / sizeof( Elf_Sym ), 0 );
3687 #endif /* powerpc */
3691 /* --------------------------------------------------------------------------
3693 * ------------------------------------------------------------------------*/
3695 #if defined(OBJFORMAT_MACHO)
3698 Support for MachO linking on Darwin/MacOS X
3699 by Wolfgang Thaller (wolfgang.thaller@gmx.net)
3701 I hereby formally apologize for the hackish nature of this code.
3702 Things that need to be done:
3703 *) implement ocVerifyImage_MachO
3704 *) add still more sanity checks.
3707 #ifdef powerpc_HOST_ARCH
3708 static int ocAllocateJumpIslands_MachO(ObjectCode* oc)
3710 struct mach_header *header = (struct mach_header *) oc->image;
3711 struct load_command *lc = (struct load_command *) (header + 1);
3714 for( i = 0; i < header->ncmds; i++ )
3716 if( lc->cmd == LC_SYMTAB )
3718 // Find out the first and last undefined external
3719 // symbol, so we don't have to allocate too many
3721 struct symtab_command *symLC = (struct symtab_command *) lc;
3722 unsigned min = symLC->nsyms, max = 0;
3723 struct nlist *nlist =
3724 symLC ? (struct nlist*) ((char*) oc->image + symLC->symoff)
3726 for(i=0;i<symLC->nsyms;i++)
3728 if(nlist[i].n_type & N_STAB)
3730 else if(nlist[i].n_type & N_EXT)
3732 if((nlist[i].n_type & N_TYPE) == N_UNDF
3733 && (nlist[i].n_value == 0))
3743 return ocAllocateJumpIslands(oc, max - min + 1, min);
3748 lc = (struct load_command *) ( ((char *)lc) + lc->cmdsize );
3750 return ocAllocateJumpIslands(oc,0,0);
3754 static int ocVerifyImage_MachO(ObjectCode* oc STG_UNUSED)
3756 // FIXME: do some verifying here
3760 static int resolveImports(
3763 struct symtab_command *symLC,
3764 struct section *sect, // ptr to lazy or non-lazy symbol pointer section
3765 unsigned long *indirectSyms,
3766 struct nlist *nlist)
3769 size_t itemSize = 4;
3772 int isJumpTable = 0;
3773 if(!strcmp(sect->sectname,"__jump_table"))
3777 ASSERT(sect->reserved2 == itemSize);
3781 for(i=0; i*itemSize < sect->size;i++)
3783 // according to otool, reserved1 contains the first index into the indirect symbol table
3784 struct nlist *symbol = &nlist[indirectSyms[sect->reserved1+i]];
3785 char *nm = image + symLC->stroff + symbol->n_un.n_strx;
3788 if((symbol->n_type & N_TYPE) == N_UNDF
3789 && (symbol->n_type & N_EXT) && (symbol->n_value != 0))
3790 addr = (void*) (symbol->n_value);
3791 else if((addr = lookupLocalSymbol(oc,nm)) != NULL)
3794 addr = lookupSymbol(nm);
3797 errorBelch("\n%s: unknown symbol `%s'", oc->fileName, nm);
3805 checkProddableBlock(oc,image + sect->offset + i*itemSize);
3806 *(image + sect->offset + i*itemSize) = 0xe9; // jmp
3807 *(unsigned*)(image + sect->offset + i*itemSize + 1)
3808 = (char*)addr - (image + sect->offset + i*itemSize + 5);
3813 checkProddableBlock(oc,((void**)(image + sect->offset)) + i);
3814 ((void**)(image + sect->offset))[i] = addr;
3821 static unsigned long relocateAddress(
3824 struct section* sections,
3825 unsigned long address)
3828 for(i = 0; i < nSections; i++)
3830 if(sections[i].addr <= address
3831 && address < sections[i].addr + sections[i].size)
3833 return (unsigned long)oc->image
3834 + sections[i].offset + address - sections[i].addr;
3837 barf("Invalid Mach-O file:"
3838 "Address out of bounds while relocating object file");
3842 static int relocateSection(
3845 struct symtab_command *symLC, struct nlist *nlist,
3846 int nSections, struct section* sections, struct section *sect)
3848 struct relocation_info *relocs;
3851 if(!strcmp(sect->sectname,"__la_symbol_ptr"))
3853 else if(!strcmp(sect->sectname,"__nl_symbol_ptr"))
3855 else if(!strcmp(sect->sectname,"__la_sym_ptr2"))
3857 else if(!strcmp(sect->sectname,"__la_sym_ptr3"))
3861 relocs = (struct relocation_info*) (image + sect->reloff);
3865 if(relocs[i].r_address & R_SCATTERED)
3867 struct scattered_relocation_info *scat =
3868 (struct scattered_relocation_info*) &relocs[i];
3872 if(scat->r_length == 2)
3874 unsigned long word = 0;
3875 unsigned long* wordPtr = (unsigned long*) (image + sect->offset + scat->r_address);
3876 checkProddableBlock(oc,wordPtr);
3878 // Note on relocation types:
3879 // i386 uses the GENERIC_RELOC_* types,
3880 // while ppc uses special PPC_RELOC_* types.
3881 // *_RELOC_VANILLA and *_RELOC_PAIR have the same value
3882 // in both cases, all others are different.
3883 // Therefore, we use GENERIC_RELOC_VANILLA
3884 // and GENERIC_RELOC_PAIR instead of the PPC variants,
3885 // and use #ifdefs for the other types.
3887 // Step 1: Figure out what the relocated value should be
3888 if(scat->r_type == GENERIC_RELOC_VANILLA)
3890 word = *wordPtr + (unsigned long) relocateAddress(
3897 #ifdef powerpc_HOST_ARCH
3898 else if(scat->r_type == PPC_RELOC_SECTDIFF
3899 || scat->r_type == PPC_RELOC_LO16_SECTDIFF
3900 || scat->r_type == PPC_RELOC_HI16_SECTDIFF
3901 || scat->r_type == PPC_RELOC_HA16_SECTDIFF)
3903 else if(scat->r_type == GENERIC_RELOC_SECTDIFF)
3906 struct scattered_relocation_info *pair =
3907 (struct scattered_relocation_info*) &relocs[i+1];
3909 if(!pair->r_scattered || pair->r_type != GENERIC_RELOC_PAIR)
3910 barf("Invalid Mach-O file: "
3911 "RELOC_*_SECTDIFF not followed by RELOC_PAIR");
3913 word = (unsigned long)
3914 (relocateAddress(oc, nSections, sections, scat->r_value)
3915 - relocateAddress(oc, nSections, sections, pair->r_value));
3918 #ifdef powerpc_HOST_ARCH
3919 else if(scat->r_type == PPC_RELOC_HI16
3920 || scat->r_type == PPC_RELOC_LO16
3921 || scat->r_type == PPC_RELOC_HA16
3922 || scat->r_type == PPC_RELOC_LO14)
3923 { // these are generated by label+offset things
3924 struct relocation_info *pair = &relocs[i+1];
3925 if((pair->r_address & R_SCATTERED) || pair->r_type != PPC_RELOC_PAIR)
3926 barf("Invalid Mach-O file: "
3927 "PPC_RELOC_* not followed by PPC_RELOC_PAIR");
3929 if(scat->r_type == PPC_RELOC_LO16)
3931 word = ((unsigned short*) wordPtr)[1];
3932 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
3934 else if(scat->r_type == PPC_RELOC_LO14)
3936 barf("Unsupported Relocation: PPC_RELOC_LO14");
3937 word = ((unsigned short*) wordPtr)[1] & 0xFFFC;
3938 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
3940 else if(scat->r_type == PPC_RELOC_HI16)
3942 word = ((unsigned short*) wordPtr)[1] << 16;
3943 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF);
3945 else if(scat->r_type == PPC_RELOC_HA16)
3947 word = ((unsigned short*) wordPtr)[1] << 16;
3948 word += ((short)relocs[i+1].r_address & (short)0xFFFF);
3952 word += (unsigned long) relocateAddress(oc, nSections, sections, scat->r_value)
3959 continue; // ignore the others
3961 #ifdef powerpc_HOST_ARCH
3962 if(scat->r_type == GENERIC_RELOC_VANILLA
3963 || scat->r_type == PPC_RELOC_SECTDIFF)
3965 if(scat->r_type == GENERIC_RELOC_VANILLA
3966 || scat->r_type == GENERIC_RELOC_SECTDIFF)
3971 #ifdef powerpc_HOST_ARCH
3972 else if(scat->r_type == PPC_RELOC_LO16_SECTDIFF || scat->r_type == PPC_RELOC_LO16)
3974 ((unsigned short*) wordPtr)[1] = word & 0xFFFF;
3976 else if(scat->r_type == PPC_RELOC_HI16_SECTDIFF || scat->r_type == PPC_RELOC_HI16)
3978 ((unsigned short*) wordPtr)[1] = (word >> 16) & 0xFFFF;
3980 else if(scat->r_type == PPC_RELOC_HA16_SECTDIFF || scat->r_type == PPC_RELOC_HA16)
3982 ((unsigned short*) wordPtr)[1] = ((word >> 16) & 0xFFFF)
3983 + ((word & (1<<15)) ? 1 : 0);
3989 continue; // FIXME: I hope it's OK to ignore all the others.
3993 struct relocation_info *reloc = &relocs[i];
3994 if(reloc->r_pcrel && !reloc->r_extern)
3997 if(reloc->r_length == 2)
3999 unsigned long word = 0;
4000 #ifdef powerpc_HOST_ARCH
4001 unsigned long jumpIsland = 0;
4002 long offsetToJumpIsland = 0xBADBAD42; // initialise to bad value
4003 // to avoid warning and to catch
4007 unsigned long* wordPtr = (unsigned long*) (image + sect->offset + reloc->r_address);
4008 checkProddableBlock(oc,wordPtr);
4010 if(reloc->r_type == GENERIC_RELOC_VANILLA)
4014 #ifdef powerpc_HOST_ARCH
4015 else if(reloc->r_type == PPC_RELOC_LO16)
4017 word = ((unsigned short*) wordPtr)[1];
4018 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
4020 else if(reloc->r_type == PPC_RELOC_HI16)
4022 word = ((unsigned short*) wordPtr)[1] << 16;
4023 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF);
4025 else if(reloc->r_type == PPC_RELOC_HA16)
4027 word = ((unsigned short*) wordPtr)[1] << 16;
4028 word += ((short)relocs[i+1].r_address & (short)0xFFFF);
4030 else if(reloc->r_type == PPC_RELOC_BR24)
4033 word = (word & 0x03FFFFFC) | ((word & 0x02000000) ? 0xFC000000 : 0);
4037 if(!reloc->r_extern)
4040 sections[reloc->r_symbolnum-1].offset
4041 - sections[reloc->r_symbolnum-1].addr
4048 struct nlist *symbol = &nlist[reloc->r_symbolnum];
4049 char *nm = image + symLC->stroff + symbol->n_un.n_strx;
4050 void *symbolAddress = lookupSymbol(nm);
4053 errorBelch("\nunknown symbol `%s'", nm);
4059 #ifdef powerpc_HOST_ARCH
4060 // In the .o file, this should be a relative jump to NULL
4061 // and we'll change it to a relative jump to the symbol
4062 ASSERT(-word == reloc->r_address);
4063 jumpIsland = makeJumpIsland(oc,reloc->r_symbolnum,(unsigned long) symbolAddress);
4066 offsetToJumpIsland = word + jumpIsland
4067 - (((long)image) + sect->offset - sect->addr);
4070 word += (unsigned long) symbolAddress
4071 - (((long)image) + sect->offset - sect->addr);
4075 word += (unsigned long) symbolAddress;
4079 if(reloc->r_type == GENERIC_RELOC_VANILLA)
4084 #ifdef powerpc_HOST_ARCH
4085 else if(reloc->r_type == PPC_RELOC_LO16)
4087 ((unsigned short*) wordPtr)[1] = word & 0xFFFF;
4090 else if(reloc->r_type == PPC_RELOC_HI16)
4092 ((unsigned short*) wordPtr)[1] = (word >> 16) & 0xFFFF;
4095 else if(reloc->r_type == PPC_RELOC_HA16)
4097 ((unsigned short*) wordPtr)[1] = ((word >> 16) & 0xFFFF)
4098 + ((word & (1<<15)) ? 1 : 0);
4101 else if(reloc->r_type == PPC_RELOC_BR24)
4103 if((long)word > (long)0x01FFFFFF || (long)word < (long)0xFFE00000)
4105 // The branch offset is too large.
4106 // Therefore, we try to use a jump island.
4109 barf("unconditional relative branch out of range: "
4110 "no jump island available");
4113 word = offsetToJumpIsland;
4114 if((long)word > (long)0x01FFFFFF || (long)word < (long)0xFFE00000)
4115 barf("unconditional relative branch out of range: "
4116 "jump island out of range");
4118 *wordPtr = (*wordPtr & 0xFC000003) | (word & 0x03FFFFFC);
4123 barf("\nunknown relocation %d",reloc->r_type);
4130 static int ocGetNames_MachO(ObjectCode* oc)
4132 char *image = (char*) oc->image;
4133 struct mach_header *header = (struct mach_header*) image;
4134 struct load_command *lc = (struct load_command*) (image + sizeof(struct mach_header));
4135 unsigned i,curSymbol = 0;
4136 struct segment_command *segLC = NULL;
4137 struct section *sections;
4138 struct symtab_command *symLC = NULL;
4139 struct nlist *nlist;
4140 unsigned long commonSize = 0;
4141 char *commonStorage = NULL;
4142 unsigned long commonCounter;
4144 for(i=0;i<header->ncmds;i++)
4146 if(lc->cmd == LC_SEGMENT)
4147 segLC = (struct segment_command*) lc;
4148 else if(lc->cmd == LC_SYMTAB)
4149 symLC = (struct symtab_command*) lc;
4150 lc = (struct load_command *) ( ((char*)lc) + lc->cmdsize );
4153 sections = (struct section*) (segLC+1);
4154 nlist = symLC ? (struct nlist*) (image + symLC->symoff)
4157 for(i=0;i<segLC->nsects;i++)
4159 if(sections[i].size == 0)
4162 if((sections[i].flags & SECTION_TYPE) == S_ZEROFILL)
4164 char * zeroFillArea = stgCallocBytes(1,sections[i].size,
4165 "ocGetNames_MachO(common symbols)");
4166 sections[i].offset = zeroFillArea - image;
4169 if(!strcmp(sections[i].sectname,"__text"))
4170 addSection(oc, SECTIONKIND_CODE_OR_RODATA,
4171 (void*) (image + sections[i].offset),
4172 (void*) (image + sections[i].offset + sections[i].size));
4173 else if(!strcmp(sections[i].sectname,"__const"))
4174 addSection(oc, SECTIONKIND_RWDATA,
4175 (void*) (image + sections[i].offset),
4176 (void*) (image + sections[i].offset + sections[i].size));
4177 else if(!strcmp(sections[i].sectname,"__data"))
4178 addSection(oc, SECTIONKIND_RWDATA,
4179 (void*) (image + sections[i].offset),
4180 (void*) (image + sections[i].offset + sections[i].size));
4181 else if(!strcmp(sections[i].sectname,"__bss")
4182 || !strcmp(sections[i].sectname,"__common"))
4183 addSection(oc, SECTIONKIND_RWDATA,
4184 (void*) (image + sections[i].offset),
4185 (void*) (image + sections[i].offset + sections[i].size));
4187 addProddableBlock(oc, (void*) (image + sections[i].offset),
4191 // count external symbols defined here
4195 for(i=0;i<symLC->nsyms;i++)
4197 if(nlist[i].n_type & N_STAB)
4199 else if(nlist[i].n_type & N_EXT)
4201 if((nlist[i].n_type & N_TYPE) == N_UNDF
4202 && (nlist[i].n_value != 0))
4204 commonSize += nlist[i].n_value;
4207 else if((nlist[i].n_type & N_TYPE) == N_SECT)
4212 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
4213 "ocGetNames_MachO(oc->symbols)");
4217 for(i=0;i<symLC->nsyms;i++)
4219 if(nlist[i].n_type & N_STAB)
4221 else if((nlist[i].n_type & N_TYPE) == N_SECT)
4223 if(nlist[i].n_type & N_EXT)
4225 char *nm = image + symLC->stroff + nlist[i].n_un.n_strx;
4226 ghciInsertStrHashTable(oc->fileName, symhash, nm,
4228 + sections[nlist[i].n_sect-1].offset
4229 - sections[nlist[i].n_sect-1].addr
4230 + nlist[i].n_value);
4231 oc->symbols[curSymbol++] = nm;
4235 char *nm = image + symLC->stroff + nlist[i].n_un.n_strx;
4236 ghciInsertStrHashTable(oc->fileName, oc->lochash, nm,
4238 + sections[nlist[i].n_sect-1].offset
4239 - sections[nlist[i].n_sect-1].addr
4240 + nlist[i].n_value);
4246 commonStorage = stgCallocBytes(1,commonSize,"ocGetNames_MachO(common symbols)");
4247 commonCounter = (unsigned long)commonStorage;
4250 for(i=0;i<symLC->nsyms;i++)
4252 if((nlist[i].n_type & N_TYPE) == N_UNDF
4253 && (nlist[i].n_type & N_EXT) && (nlist[i].n_value != 0))
4255 char *nm = image + symLC->stroff + nlist[i].n_un.n_strx;
4256 unsigned long sz = nlist[i].n_value;
4258 nlist[i].n_value = commonCounter;
4260 ghciInsertStrHashTable(oc->fileName, symhash, nm,
4261 (void*)commonCounter);
4262 oc->symbols[curSymbol++] = nm;
4264 commonCounter += sz;
4271 static int ocResolve_MachO(ObjectCode* oc)
4273 char *image = (char*) oc->image;
4274 struct mach_header *header = (struct mach_header*) image;
4275 struct load_command *lc = (struct load_command*) (image + sizeof(struct mach_header));
4277 struct segment_command *segLC = NULL;
4278 struct section *sections;
4279 struct symtab_command *symLC = NULL;
4280 struct dysymtab_command *dsymLC = NULL;
4281 struct nlist *nlist;
4283 for(i=0;i<header->ncmds;i++)
4285 if(lc->cmd == LC_SEGMENT)
4286 segLC = (struct segment_command*) lc;
4287 else if(lc->cmd == LC_SYMTAB)
4288 symLC = (struct symtab_command*) lc;
4289 else if(lc->cmd == LC_DYSYMTAB)
4290 dsymLC = (struct dysymtab_command*) lc;
4291 lc = (struct load_command *) ( ((char*)lc) + lc->cmdsize );
4294 sections = (struct section*) (segLC+1);
4295 nlist = symLC ? (struct nlist*) (image + symLC->symoff)
4300 unsigned long *indirectSyms
4301 = (unsigned long*) (image + dsymLC->indirectsymoff);
4303 for(i=0;i<segLC->nsects;i++)
4305 if( !strcmp(sections[i].sectname,"__la_symbol_ptr")
4306 || !strcmp(sections[i].sectname,"__la_sym_ptr2")
4307 || !strcmp(sections[i].sectname,"__la_sym_ptr3"))
4309 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4312 else if(!strcmp(sections[i].sectname,"__nl_symbol_ptr")
4313 || !strcmp(sections[i].sectname,"__pointers"))
4315 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4318 else if(!strcmp(sections[i].sectname,"__jump_table"))
4320 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4326 for(i=0;i<segLC->nsects;i++)
4328 if(!relocateSection(oc,image,symLC,nlist,segLC->nsects,sections,§ions[i]))
4332 /* Free the local symbol table; we won't need it again. */
4333 freeHashTable(oc->lochash, NULL);
4336 #if defined (powerpc_HOST_ARCH)
4337 ocFlushInstructionCache( oc );
4343 #ifdef powerpc_HOST_ARCH
4345 * The Mach-O object format uses leading underscores. But not everywhere.
4346 * There is a small number of runtime support functions defined in
4347 * libcc_dynamic.a whose name does not have a leading underscore.
4348 * As a consequence, we can't get their address from C code.
4349 * We have to use inline assembler just to take the address of a function.
4353 static void machoInitSymbolsWithoutUnderscore()
4355 extern void* symbolsWithoutUnderscore[];
4356 void **p = symbolsWithoutUnderscore;
4357 __asm__ volatile(".globl _symbolsWithoutUnderscore\n.data\n_symbolsWithoutUnderscore:");
4361 __asm__ volatile(".long " # x);
4363 RTS_MACHO_NOUNDERLINE_SYMBOLS
4365 __asm__ volatile(".text");
4369 ghciInsertStrHashTable("(GHCi built-in symbols)", symhash, #x, *p++);
4371 RTS_MACHO_NOUNDERLINE_SYMBOLS
4378 * Figure out by how much to shift the entire Mach-O file in memory
4379 * when loading so that its single segment ends up 16-byte-aligned
4381 static int machoGetMisalignment( FILE * f )
4383 struct mach_header header;
4386 fread(&header, sizeof(header), 1, f);
4389 if(header.magic != MH_MAGIC)
4392 misalignment = (header.sizeofcmds + sizeof(header))
4395 return misalignment ? (16 - misalignment) : 0;
4400 int isSuffixOf(char* x, char* suffix) {
4401 int suffix_len = strlen (suffix);
4402 int x_len = strlen (x);
4406 if (suffix_len > x_len)
4408 if (suffix_len == 0)
4411 char* x_suffix = &x[strlen(x)-strlen(suffix)];
4412 return strcmp(x_suffix, suffix) == 0;