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;
98 /* List of currently loaded objects */
99 ObjectCode *objects = NULL; /* initially empty */
101 #if defined(OBJFORMAT_ELF)
102 static int ocVerifyImage_ELF ( ObjectCode* oc );
103 static int ocGetNames_ELF ( ObjectCode* oc );
104 static int ocResolve_ELF ( ObjectCode* oc );
105 #if defined(powerpc_HOST_ARCH)
106 static int ocAllocateJumpIslands_ELF ( ObjectCode* oc );
108 #elif defined(OBJFORMAT_PEi386)
109 static int ocVerifyImage_PEi386 ( ObjectCode* oc );
110 static int ocGetNames_PEi386 ( ObjectCode* oc );
111 static int ocResolve_PEi386 ( ObjectCode* oc );
112 #elif defined(OBJFORMAT_MACHO)
113 static int ocVerifyImage_MachO ( ObjectCode* oc );
114 static int ocGetNames_MachO ( ObjectCode* oc );
115 static int ocResolve_MachO ( ObjectCode* oc );
117 static int machoGetMisalignment( FILE * );
118 #ifdef powerpc_HOST_ARCH
119 static int ocAllocateJumpIslands_MachO ( ObjectCode* oc );
120 static void machoInitSymbolsWithoutUnderscore( void );
124 #if defined(x86_64_HOST_ARCH)
125 static void*x86_64_high_symbol( char *lbl, void *addr );
128 /* -----------------------------------------------------------------------------
129 * Built-in symbols from the RTS
132 typedef struct _RtsSymbolVal {
139 #define Maybe_Stable_Names SymX(mkWeakzh_fast) \
140 SymX(makeStableNamezh_fast) \
141 SymX(finalizzeWeakzh_fast)
143 /* These are not available in GUM!!! -- HWL */
144 #define Maybe_Stable_Names
147 #if !defined (mingw32_HOST_OS)
148 #define RTS_POSIX_ONLY_SYMBOLS \
149 SymX(signal_handlers) \
150 SymX(stg_sig_install) \
154 #if defined (cygwin32_HOST_OS)
155 #define RTS_MINGW_ONLY_SYMBOLS /**/
156 /* Don't have the ability to read import libs / archives, so
157 * we have to stupidly list a lot of what libcygwin.a
160 #define RTS_CYGWIN_ONLY_SYMBOLS \
238 #elif !defined(mingw32_HOST_OS)
239 #define RTS_MINGW_ONLY_SYMBOLS /**/
240 #define RTS_CYGWIN_ONLY_SYMBOLS /**/
241 #else /* defined(mingw32_HOST_OS) */
242 #define RTS_POSIX_ONLY_SYMBOLS /**/
243 #define RTS_CYGWIN_ONLY_SYMBOLS /**/
245 /* Extra syms gen'ed by mingw-2's gcc-3.2: */
247 #define RTS_MINGW_EXTRA_SYMS \
248 Sym(_imp____mb_cur_max) \
251 #define RTS_MINGW_EXTRA_SYMS
254 /* These are statically linked from the mingw libraries into the ghc
255 executable, so we have to employ this hack. */
256 #define RTS_MINGW_ONLY_SYMBOLS \
257 SymX(asyncReadzh_fast) \
258 SymX(asyncWritezh_fast) \
259 SymX(asyncDoProczh_fast) \
271 SymX(getservbyname) \
272 SymX(getservbyport) \
273 SymX(getprotobynumber) \
274 SymX(getprotobyname) \
275 SymX(gethostbyname) \
276 SymX(gethostbyaddr) \
323 SymX(rts_InstallConsoleEvent) \
324 SymX(rts_ConsoleHandlerDone) \
326 Sym(_imp___timezone) \
336 RTS_MINGW_EXTRA_SYMS \
340 #if defined(darwin_TARGET_OS) && HAVE_PRINTF_LDBLSTUB
341 #define RTS_DARWIN_ONLY_SYMBOLS \
342 Sym(asprintf$LDBLStub) \
346 Sym(fprintf$LDBLStub) \
347 Sym(fscanf$LDBLStub) \
348 Sym(fwprintf$LDBLStub) \
349 Sym(fwscanf$LDBLStub) \
350 Sym(printf$LDBLStub) \
351 Sym(scanf$LDBLStub) \
352 Sym(snprintf$LDBLStub) \
353 Sym(sprintf$LDBLStub) \
354 Sym(sscanf$LDBLStub) \
355 Sym(strtold$LDBLStub) \
356 Sym(swprintf$LDBLStub) \
357 Sym(swscanf$LDBLStub) \
358 Sym(syslog$LDBLStub) \
359 Sym(vasprintf$LDBLStub) \
361 Sym(verrc$LDBLStub) \
362 Sym(verrx$LDBLStub) \
363 Sym(vfprintf$LDBLStub) \
364 Sym(vfscanf$LDBLStub) \
365 Sym(vfwprintf$LDBLStub) \
366 Sym(vfwscanf$LDBLStub) \
367 Sym(vprintf$LDBLStub) \
368 Sym(vscanf$LDBLStub) \
369 Sym(vsnprintf$LDBLStub) \
370 Sym(vsprintf$LDBLStub) \
371 Sym(vsscanf$LDBLStub) \
372 Sym(vswprintf$LDBLStub) \
373 Sym(vswscanf$LDBLStub) \
374 Sym(vsyslog$LDBLStub) \
375 Sym(vwarn$LDBLStub) \
376 Sym(vwarnc$LDBLStub) \
377 Sym(vwarnx$LDBLStub) \
378 Sym(vwprintf$LDBLStub) \
379 Sym(vwscanf$LDBLStub) \
381 Sym(warnc$LDBLStub) \
382 Sym(warnx$LDBLStub) \
383 Sym(wcstold$LDBLStub) \
384 Sym(wprintf$LDBLStub) \
387 #define RTS_DARWIN_ONLY_SYMBOLS
391 # define MAIN_CAP_SYM SymX(MainCapability)
393 # define MAIN_CAP_SYM
396 #if !defined(mingw32_HOST_OS)
397 #define RTS_USER_SIGNALS_SYMBOLS \
398 SymX(setIOManagerPipe)
400 #define RTS_USER_SIGNALS_SYMBOLS /* nothing */
403 #ifdef TABLES_NEXT_TO_CODE
404 #define RTS_RET_SYMBOLS /* nothing */
406 #define RTS_RET_SYMBOLS \
407 SymX(stg_enter_ret) \
408 SymX(stg_gc_fun_ret) \
415 SymX(stg_ap_pv_ret) \
416 SymX(stg_ap_pp_ret) \
417 SymX(stg_ap_ppv_ret) \
418 SymX(stg_ap_ppp_ret) \
419 SymX(stg_ap_pppv_ret) \
420 SymX(stg_ap_pppp_ret) \
421 SymX(stg_ap_ppppp_ret) \
422 SymX(stg_ap_pppppp_ret)
425 #define RTS_SYMBOLS \
428 SymX(stg_enter_info) \
429 SymX(stg_gc_void_info) \
430 SymX(__stg_gc_enter_1) \
431 SymX(stg_gc_noregs) \
432 SymX(stg_gc_unpt_r1_info) \
433 SymX(stg_gc_unpt_r1) \
434 SymX(stg_gc_unbx_r1_info) \
435 SymX(stg_gc_unbx_r1) \
436 SymX(stg_gc_f1_info) \
438 SymX(stg_gc_d1_info) \
440 SymX(stg_gc_l1_info) \
443 SymX(stg_gc_fun_info) \
445 SymX(stg_gc_gen_info) \
446 SymX(stg_gc_gen_hp) \
448 SymX(stg_gen_yield) \
449 SymX(stg_yield_noregs) \
450 SymX(stg_yield_to_interpreter) \
451 SymX(stg_gen_block) \
452 SymX(stg_block_noregs) \
454 SymX(stg_block_takemvar) \
455 SymX(stg_block_putmvar) \
456 SymX(stg_seq_frame_info) \
458 SymX(MallocFailHook) \
460 SymX(OutOfHeapHook) \
461 SymX(StackOverflowHook) \
462 SymX(__encodeDouble) \
463 SymX(__encodeFloat) \
467 SymX(__gmpz_cmp_si) \
468 SymX(__gmpz_cmp_ui) \
469 SymX(__gmpz_get_si) \
470 SymX(__gmpz_get_ui) \
471 SymX(__int_encodeDouble) \
472 SymX(__int_encodeFloat) \
473 SymX(andIntegerzh_fast) \
474 SymX(atomicallyzh_fast) \
478 SymX(blockAsyncExceptionszh_fast) \
480 SymX(catchRetryzh_fast) \
481 SymX(catchSTMzh_fast) \
483 SymX(closure_flags) \
485 SymX(cmpIntegerzh_fast) \
486 SymX(cmpIntegerIntzh_fast) \
487 SymX(complementIntegerzh_fast) \
488 SymX(createAdjustor) \
489 SymX(decodeDoublezh_fast) \
490 SymX(decodeFloatzh_fast) \
493 SymX(deRefWeakzh_fast) \
494 SymX(deRefStablePtrzh_fast) \
495 SymX(dirty_MUT_VAR) \
496 SymX(divExactIntegerzh_fast) \
497 SymX(divModIntegerzh_fast) \
499 SymX(forkOnzh_fast) \
501 SymX(forkOS_createThread) \
502 SymX(freeHaskellFunctionPtr) \
503 SymX(freeStablePtr) \
504 SymX(getOrSetTypeableStore) \
505 SymX(gcdIntegerzh_fast) \
506 SymX(gcdIntegerIntzh_fast) \
507 SymX(gcdIntzh_fast) \
516 SymX(hs_perform_gc) \
517 SymX(hs_free_stable_ptr) \
518 SymX(hs_free_fun_ptr) \
520 SymX(int2Integerzh_fast) \
521 SymX(integer2Intzh_fast) \
522 SymX(integer2Wordzh_fast) \
523 SymX(isCurrentThreadBoundzh_fast) \
524 SymX(isDoubleDenormalized) \
525 SymX(isDoubleInfinite) \
527 SymX(isDoubleNegativeZero) \
528 SymX(isEmptyMVarzh_fast) \
529 SymX(isFloatDenormalized) \
530 SymX(isFloatInfinite) \
532 SymX(isFloatNegativeZero) \
533 SymX(killThreadzh_fast) \
535 SymX(insertStableSymbol) \
538 SymX(makeStablePtrzh_fast) \
539 SymX(minusIntegerzh_fast) \
540 SymX(mkApUpd0zh_fast) \
541 SymX(myThreadIdzh_fast) \
542 SymX(labelThreadzh_fast) \
543 SymX(newArrayzh_fast) \
544 SymX(newBCOzh_fast) \
545 SymX(newByteArrayzh_fast) \
546 SymX_redirect(newCAF, newDynCAF) \
547 SymX(newMVarzh_fast) \
548 SymX(newMutVarzh_fast) \
549 SymX(newTVarzh_fast) \
550 SymX(atomicModifyMutVarzh_fast) \
551 SymX(newPinnedByteArrayzh_fast) \
553 SymX(orIntegerzh_fast) \
555 SymX(performMajorGC) \
556 SymX(plusIntegerzh_fast) \
559 SymX(putMVarzh_fast) \
560 SymX(quotIntegerzh_fast) \
561 SymX(quotRemIntegerzh_fast) \
563 SymX(raiseIOzh_fast) \
564 SymX(readTVarzh_fast) \
565 SymX(remIntegerzh_fast) \
566 SymX(resetNonBlockingFd) \
571 SymX(rts_checkSchedStatus) \
574 SymX(rts_evalLazyIO) \
575 SymX(rts_evalStableIO) \
579 SymX(rts_getDouble) \
584 SymX(rts_getFunPtr) \
585 SymX(rts_getStablePtr) \
586 SymX(rts_getThreadId) \
588 SymX(rts_getWord32) \
601 SymX(rts_mkStablePtr) \
609 SymX(rtsSupportsBoundThreads) \
610 SymX(__hscore_get_saved_termios) \
611 SymX(__hscore_set_saved_termios) \
613 SymX(startupHaskell) \
614 SymX(shutdownHaskell) \
615 SymX(shutdownHaskellAndExit) \
616 SymX(stable_ptr_table) \
617 SymX(stackOverflow) \
618 SymX(stg_CAF_BLACKHOLE_info) \
619 SymX(awakenBlockedQueue) \
620 SymX(stg_CHARLIKE_closure) \
621 SymX(stg_EMPTY_MVAR_info) \
622 SymX(stg_IND_STATIC_info) \
623 SymX(stg_INTLIKE_closure) \
624 SymX(stg_MUT_ARR_PTRS_DIRTY_info) \
625 SymX(stg_MUT_ARR_PTRS_FROZEN_info) \
626 SymX(stg_MUT_ARR_PTRS_FROZEN0_info) \
627 SymX(stg_WEAK_info) \
628 SymX(stg_ap_v_info) \
629 SymX(stg_ap_f_info) \
630 SymX(stg_ap_d_info) \
631 SymX(stg_ap_l_info) \
632 SymX(stg_ap_n_info) \
633 SymX(stg_ap_p_info) \
634 SymX(stg_ap_pv_info) \
635 SymX(stg_ap_pp_info) \
636 SymX(stg_ap_ppv_info) \
637 SymX(stg_ap_ppp_info) \
638 SymX(stg_ap_pppv_info) \
639 SymX(stg_ap_pppp_info) \
640 SymX(stg_ap_ppppp_info) \
641 SymX(stg_ap_pppppp_info) \
642 SymX(stg_ap_0_fast) \
643 SymX(stg_ap_v_fast) \
644 SymX(stg_ap_f_fast) \
645 SymX(stg_ap_d_fast) \
646 SymX(stg_ap_l_fast) \
647 SymX(stg_ap_n_fast) \
648 SymX(stg_ap_p_fast) \
649 SymX(stg_ap_pv_fast) \
650 SymX(stg_ap_pp_fast) \
651 SymX(stg_ap_ppv_fast) \
652 SymX(stg_ap_ppp_fast) \
653 SymX(stg_ap_pppv_fast) \
654 SymX(stg_ap_pppp_fast) \
655 SymX(stg_ap_ppppp_fast) \
656 SymX(stg_ap_pppppp_fast) \
657 SymX(stg_ap_1_upd_info) \
658 SymX(stg_ap_2_upd_info) \
659 SymX(stg_ap_3_upd_info) \
660 SymX(stg_ap_4_upd_info) \
661 SymX(stg_ap_5_upd_info) \
662 SymX(stg_ap_6_upd_info) \
663 SymX(stg_ap_7_upd_info) \
665 SymX(stg_sel_0_upd_info) \
666 SymX(stg_sel_10_upd_info) \
667 SymX(stg_sel_11_upd_info) \
668 SymX(stg_sel_12_upd_info) \
669 SymX(stg_sel_13_upd_info) \
670 SymX(stg_sel_14_upd_info) \
671 SymX(stg_sel_15_upd_info) \
672 SymX(stg_sel_1_upd_info) \
673 SymX(stg_sel_2_upd_info) \
674 SymX(stg_sel_3_upd_info) \
675 SymX(stg_sel_4_upd_info) \
676 SymX(stg_sel_5_upd_info) \
677 SymX(stg_sel_6_upd_info) \
678 SymX(stg_sel_7_upd_info) \
679 SymX(stg_sel_8_upd_info) \
680 SymX(stg_sel_9_upd_info) \
681 SymX(stg_upd_frame_info) \
682 SymX(suspendThread) \
683 SymX(takeMVarzh_fast) \
684 SymX(timesIntegerzh_fast) \
685 SymX(tryPutMVarzh_fast) \
686 SymX(tryTakeMVarzh_fast) \
687 SymX(unblockAsyncExceptionszh_fast) \
689 SymX(unsafeThawArrayzh_fast) \
690 SymX(waitReadzh_fast) \
691 SymX(waitWritezh_fast) \
692 SymX(word2Integerzh_fast) \
693 SymX(writeTVarzh_fast) \
694 SymX(xorIntegerzh_fast) \
696 SymX(stg_interp_constr_entry) \
697 SymX(stg_interp_constr1_entry) \
698 SymX(stg_interp_constr2_entry) \
699 SymX(stg_interp_constr3_entry) \
700 SymX(stg_interp_constr4_entry) \
701 SymX(stg_interp_constr5_entry) \
702 SymX(stg_interp_constr6_entry) \
703 SymX(stg_interp_constr7_entry) \
704 SymX(stg_interp_constr8_entry) \
707 SymX(getAllocations) \
710 RTS_USER_SIGNALS_SYMBOLS
712 #ifdef SUPPORT_LONG_LONGS
713 #define RTS_LONG_LONG_SYMS \
714 SymX(int64ToIntegerzh_fast) \
715 SymX(word64ToIntegerzh_fast)
717 #define RTS_LONG_LONG_SYMS /* nothing */
720 // 64-bit support functions in libgcc.a
721 #if defined(__GNUC__) && SIZEOF_VOID_P <= 4
722 #define RTS_LIBGCC_SYMBOLS \
732 #elif defined(ia64_HOST_ARCH)
733 #define RTS_LIBGCC_SYMBOLS \
741 #define RTS_LIBGCC_SYMBOLS
744 #if defined(darwin_HOST_OS) && defined(powerpc_HOST_ARCH)
745 // Symbols that don't have a leading underscore
746 // on Mac OS X. They have to receive special treatment,
747 // see machoInitSymbolsWithoutUnderscore()
748 #define RTS_MACHO_NOUNDERLINE_SYMBOLS \
753 /* entirely bogus claims about types of these symbols */
754 #define Sym(vvv) extern void vvv(void);
755 #define SymX(vvv) /**/
756 #define SymX_redirect(vvv,xxx) /**/
760 RTS_POSIX_ONLY_SYMBOLS
761 RTS_MINGW_ONLY_SYMBOLS
762 RTS_CYGWIN_ONLY_SYMBOLS
763 RTS_DARWIN_ONLY_SYMBOLS
769 #ifdef LEADING_UNDERSCORE
770 #define MAYBE_LEADING_UNDERSCORE_STR(s) ("_" s)
772 #define MAYBE_LEADING_UNDERSCORE_STR(s) (s)
775 #define Sym(vvv) { MAYBE_LEADING_UNDERSCORE_STR(#vvv), \
777 #define SymX(vvv) Sym(vvv)
779 // SymX_redirect allows us to redirect references to one symbol to
780 // another symbol. See newCAF/newDynCAF for an example.
781 #define SymX_redirect(vvv,xxx) \
782 { MAYBE_LEADING_UNDERSCORE_STR(#vvv), \
785 static RtsSymbolVal rtsSyms[] = {
789 RTS_POSIX_ONLY_SYMBOLS
790 RTS_MINGW_ONLY_SYMBOLS
791 RTS_CYGWIN_ONLY_SYMBOLS
792 RTS_DARWIN_ONLY_SYMBOLS
794 #if defined(darwin_HOST_OS) && defined(i386_HOST_ARCH)
795 // dyld stub code contains references to this,
796 // but it should never be called because we treat
797 // lazy pointers as nonlazy.
798 { "dyld_stub_binding_helper", (void*)0xDEADBEEF },
800 { 0, 0 } /* sentinel */
806 /* -----------------------------------------------------------------------------
807 * Insert symbols into hash tables, checking for duplicates.
809 static void ghciInsertStrHashTable ( char* obj_name,
815 if (lookupHashTable(table, (StgWord)key) == NULL)
817 insertStrHashTable(table, (StgWord)key, data);
822 "GHCi runtime linker: fatal error: I found a duplicate definition for symbol\n"
824 "whilst processing object file\n"
826 "This could be caused by:\n"
827 " * Loading two different object files which export the same symbol\n"
828 " * Specifying the same object file twice on the GHCi command line\n"
829 " * An incorrect `package.conf' entry, causing some object to be\n"
831 "GHCi cannot safely continue in this situation. Exiting now. Sorry.\n"
840 /* -----------------------------------------------------------------------------
841 * initialize the object linker
845 static int linker_init_done = 0 ;
847 #if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
848 static void *dl_prog_handle;
856 /* Make initLinker idempotent, so we can call it
857 before evey relevant operation; that means we
858 don't need to initialise the linker separately */
859 if (linker_init_done == 1) { return; } else {
860 linker_init_done = 1;
863 stablehash = allocStrHashTable();
864 symhash = allocStrHashTable();
866 /* populate the symbol table with stuff from the RTS */
867 for (sym = rtsSyms; sym->lbl != NULL; sym++) {
868 ghciInsertStrHashTable("(GHCi built-in symbols)",
869 symhash, sym->lbl, sym->addr);
871 # if defined(OBJFORMAT_MACHO) && defined(powerpc_HOST_ARCH)
872 machoInitSymbolsWithoutUnderscore();
875 # if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
876 # if defined(RTLD_DEFAULT)
877 dl_prog_handle = RTLD_DEFAULT;
879 dl_prog_handle = dlopen(NULL, RTLD_LAZY);
880 # endif /* RTLD_DEFAULT */
884 /* -----------------------------------------------------------------------------
885 * Loading DLL or .so dynamic libraries
886 * -----------------------------------------------------------------------------
888 * Add a DLL from which symbols may be found. In the ELF case, just
889 * do RTLD_GLOBAL-style add, so no further messing around needs to
890 * happen in order that symbols in the loaded .so are findable --
891 * lookupSymbol() will subsequently see them by dlsym on the program's
892 * dl-handle. Returns NULL if success, otherwise ptr to an err msg.
894 * In the PEi386 case, open the DLLs and put handles to them in a
895 * linked list. When looking for a symbol, try all handles in the
896 * list. This means that we need to load even DLLs that are guaranteed
897 * to be in the ghc.exe image already, just so we can get a handle
898 * to give to loadSymbol, so that we can find the symbols. For such
899 * libraries, the LoadLibrary call should be a no-op except for returning
904 #if defined(OBJFORMAT_PEi386)
905 /* A record for storing handles into DLLs. */
910 struct _OpenedDLL* next;
915 /* A list thereof. */
916 static OpenedDLL* opened_dlls = NULL;
920 addDLL( char *dll_name )
922 # if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
923 /* ------------------- ELF DLL loader ------------------- */
929 hdl= dlopen(dll_name, RTLD_NOW | RTLD_GLOBAL);
932 /* dlopen failed; return a ptr to the error msg. */
934 if (errmsg == NULL) errmsg = "addDLL: unknown error";
941 # elif defined(OBJFORMAT_PEi386)
942 /* ------------------- Win32 DLL loader ------------------- */
950 /* debugBelch("\naddDLL; dll_name = `%s'\n", dll_name); */
952 /* See if we've already got it, and ignore if so. */
953 for (o_dll = opened_dlls; o_dll != NULL; o_dll = o_dll->next) {
954 if (0 == strcmp(o_dll->name, dll_name))
958 /* The file name has no suffix (yet) so that we can try
959 both foo.dll and foo.drv
961 The documentation for LoadLibrary says:
962 If no file name extension is specified in the lpFileName
963 parameter, the default library extension .dll is
964 appended. However, the file name string can include a trailing
965 point character (.) to indicate that the module name has no
968 buf = stgMallocBytes(strlen(dll_name) + 10, "addDLL");
969 sprintf(buf, "%s.DLL", dll_name);
970 instance = LoadLibrary(buf);
971 if (instance == NULL) {
972 sprintf(buf, "%s.DRV", dll_name); // KAA: allow loading of drivers (like winspool.drv)
973 instance = LoadLibrary(buf);
974 if (instance == NULL) {
977 /* LoadLibrary failed; return a ptr to the error msg. */
978 return "addDLL: unknown error";
983 /* Add this DLL to the list of DLLs in which to search for symbols. */
984 o_dll = stgMallocBytes( sizeof(OpenedDLL), "addDLL" );
985 o_dll->name = stgMallocBytes(1+strlen(dll_name), "addDLL");
986 strcpy(o_dll->name, dll_name);
987 o_dll->instance = instance;
988 o_dll->next = opened_dlls;
993 barf("addDLL: not implemented on this platform");
997 /* -----------------------------------------------------------------------------
998 * insert a stable symbol in the hash table
1002 insertStableSymbol(char* obj_name, char* key, StgPtr p)
1004 ghciInsertStrHashTable(obj_name, stablehash, key, getStablePtr(p));
1008 /* -----------------------------------------------------------------------------
1009 * insert a symbol in the hash table
1012 insertSymbol(char* obj_name, char* key, void* data)
1014 ghciInsertStrHashTable(obj_name, symhash, key, data);
1017 /* -----------------------------------------------------------------------------
1018 * lookup a symbol in the hash table
1021 lookupSymbol( char *lbl )
1025 ASSERT(symhash != NULL);
1026 val = lookupStrHashTable(symhash, lbl);
1029 # if defined(OBJFORMAT_ELF)
1030 # if defined(x86_64_HOST_ARCH)
1031 val = dlsym(dl_prog_handle, lbl);
1032 if (val >= (void *)0x80000000) {
1034 new_val = x86_64_high_symbol(lbl, val);
1035 IF_DEBUG(linker,debugBelch("lookupSymbol: relocating out of range symbol: %s = %p, now %p\n", lbl, val, new_val));
1041 return dlsym(dl_prog_handle, lbl);
1043 # elif defined(OBJFORMAT_MACHO)
1044 if(NSIsSymbolNameDefined(lbl)) {
1045 NSSymbol symbol = NSLookupAndBindSymbol(lbl);
1046 return NSAddressOfSymbol(symbol);
1050 # elif defined(OBJFORMAT_PEi386)
1053 for (o_dll = opened_dlls; o_dll != NULL; o_dll = o_dll->next) {
1054 /* debugBelch("look in %s for %s\n", o_dll->name, lbl); */
1055 if (lbl[0] == '_') {
1056 /* HACK: if the name has an initial underscore, try stripping
1057 it off & look that up first. I've yet to verify whether there's
1058 a Rule that governs whether an initial '_' *should always* be
1059 stripped off when mapping from import lib name to the DLL name.
1061 sym = GetProcAddress(o_dll->instance, (lbl+1));
1063 /*debugBelch("found %s in %s\n", lbl+1,o_dll->name);*/
1067 sym = GetProcAddress(o_dll->instance, lbl);
1069 /*debugBelch("found %s in %s\n", lbl,o_dll->name);*/
1084 __attribute((unused))
1086 lookupLocalSymbol( ObjectCode* oc, char *lbl )
1090 val = lookupStrHashTable(oc->lochash, lbl);
1100 /* -----------------------------------------------------------------------------
1101 * Debugging aid: look in GHCi's object symbol tables for symbols
1102 * within DELTA bytes of the specified address, and show their names.
1105 void ghci_enquire ( char* addr );
1107 void ghci_enquire ( char* addr )
1112 const int DELTA = 64;
1117 for (oc = objects; oc; oc = oc->next) {
1118 for (i = 0; i < oc->n_symbols; i++) {
1119 sym = oc->symbols[i];
1120 if (sym == NULL) continue;
1121 // debugBelch("enquire %p %p\n", sym, oc->lochash);
1123 if (oc->lochash != NULL) {
1124 a = lookupStrHashTable(oc->lochash, sym);
1127 a = lookupStrHashTable(symhash, sym);
1130 // debugBelch("ghci_enquire: can't find %s\n", sym);
1132 else if (addr-DELTA <= a && a <= addr+DELTA) {
1133 debugBelch("%p + %3d == `%s'\n", addr, (int)(a - addr), sym);
1140 #ifdef ia64_HOST_ARCH
1141 static unsigned int PLTSize(void);
1144 /* -----------------------------------------------------------------------------
1145 * Load an obj (populate the global symbol table, but don't resolve yet)
1147 * Returns: 1 if ok, 0 on error.
1150 loadObj( char *path )
1157 void *map_addr = NULL;
1164 /* debugBelch("loadObj %s\n", path ); */
1166 /* Check that we haven't already loaded this object.
1167 Ignore requests to load multiple times */
1171 for (o = objects; o; o = o->next) {
1172 if (0 == strcmp(o->fileName, path)) {
1174 break; /* don't need to search further */
1178 IF_DEBUG(linker, debugBelch(
1179 "GHCi runtime linker: warning: looks like you're trying to load the\n"
1180 "same object file twice:\n"
1182 "GHCi will ignore this, but be warned.\n"
1184 return 1; /* success */
1188 oc = stgMallocBytes(sizeof(ObjectCode), "loadObj(oc)");
1190 # if defined(OBJFORMAT_ELF)
1191 oc->formatName = "ELF";
1192 # elif defined(OBJFORMAT_PEi386)
1193 oc->formatName = "PEi386";
1194 # elif defined(OBJFORMAT_MACHO)
1195 oc->formatName = "Mach-O";
1198 barf("loadObj: not implemented on this platform");
1201 r = stat(path, &st);
1202 if (r == -1) { return 0; }
1204 /* sigh, strdup() isn't a POSIX function, so do it the long way */
1205 oc->fileName = stgMallocBytes( strlen(path)+1, "loadObj" );
1206 strcpy(oc->fileName, path);
1208 oc->fileSize = st.st_size;
1210 oc->sections = NULL;
1211 oc->lochash = allocStrHashTable();
1212 oc->proddables = NULL;
1214 /* chain it onto the list of objects */
1219 #define ROUND_UP(x,size) ((x + size - 1) & ~(size - 1))
1221 /* On many architectures malloc'd memory isn't executable, so we need to use mmap. */
1223 #if defined(openbsd_HOST_OS)
1224 fd = open(path, O_RDONLY, S_IRUSR);
1226 fd = open(path, O_RDONLY);
1229 barf("loadObj: can't open `%s'", path);
1231 pagesize = getpagesize();
1233 #ifdef ia64_HOST_ARCH
1234 /* The PLT needs to be right before the object */
1235 n = ROUND_UP(PLTSize(), pagesize);
1236 oc->plt = mmap(NULL, n, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
1237 if (oc->plt == MAP_FAILED)
1238 barf("loadObj: can't allocate PLT");
1241 map_addr = oc->plt + n;
1244 n = ROUND_UP(oc->fileSize, pagesize);
1246 /* Link objects into the lower 2Gb on x86_64. GHC assumes the
1247 * small memory model on this architecture (see gcc docs,
1250 #ifdef x86_64_HOST_ARCH
1251 #define EXTRA_MAP_FLAGS MAP_32BIT
1253 #define EXTRA_MAP_FLAGS 0
1256 oc->image = mmap(map_addr, n, PROT_EXEC|PROT_READ|PROT_WRITE,
1257 MAP_PRIVATE|EXTRA_MAP_FLAGS, fd, 0);
1258 if (oc->image == MAP_FAILED)
1259 barf("loadObj: can't map `%s'", path);
1263 #else /* !USE_MMAP */
1265 /* load the image into memory */
1266 f = fopen(path, "rb");
1268 barf("loadObj: can't read `%s'", path);
1270 #ifdef darwin_HOST_OS
1271 // In a Mach-O .o file, all sections can and will be misaligned
1272 // if the total size of the headers is not a multiple of the
1273 // desired alignment. This is fine for .o files that only serve
1274 // as input for the static linker, but it's not fine for us,
1275 // as SSE (used by gcc for floating point) and Altivec require
1276 // 16-byte alignment.
1277 // We calculate the correct alignment from the header before
1278 // reading the file, and then we misalign oc->image on purpose so
1279 // that the actual sections end up aligned again.
1280 misalignment = machoGetMisalignment(f);
1281 oc->misalignment = misalignment;
1286 oc->image = stgMallocBytes(oc->fileSize + misalignment, "loadObj(image)");
1287 oc->image += misalignment;
1289 n = fread ( oc->image, 1, oc->fileSize, f );
1290 if (n != oc->fileSize)
1291 barf("loadObj: error whilst reading `%s'", path);
1295 #endif /* USE_MMAP */
1297 # if defined(OBJFORMAT_MACHO) && defined(powerpc_HOST_ARCH)
1298 r = ocAllocateJumpIslands_MachO ( oc );
1299 if (!r) { return r; }
1300 # elif defined(OBJFORMAT_ELF) && defined(powerpc_HOST_ARCH)
1301 r = ocAllocateJumpIslands_ELF ( oc );
1302 if (!r) { return r; }
1305 /* verify the in-memory image */
1306 # if defined(OBJFORMAT_ELF)
1307 r = ocVerifyImage_ELF ( oc );
1308 # elif defined(OBJFORMAT_PEi386)
1309 r = ocVerifyImage_PEi386 ( oc );
1310 # elif defined(OBJFORMAT_MACHO)
1311 r = ocVerifyImage_MachO ( oc );
1313 barf("loadObj: no verify method");
1315 if (!r) { return r; }
1317 /* build the symbol list for this image */
1318 # if defined(OBJFORMAT_ELF)
1319 r = ocGetNames_ELF ( oc );
1320 # elif defined(OBJFORMAT_PEi386)
1321 r = ocGetNames_PEi386 ( oc );
1322 # elif defined(OBJFORMAT_MACHO)
1323 r = ocGetNames_MachO ( oc );
1325 barf("loadObj: no getNames method");
1327 if (!r) { return r; }
1329 /* loaded, but not resolved yet */
1330 oc->status = OBJECT_LOADED;
1335 /* -----------------------------------------------------------------------------
1336 * resolve all the currently unlinked objects in memory
1338 * Returns: 1 if ok, 0 on error.
1348 for (oc = objects; oc; oc = oc->next) {
1349 if (oc->status != OBJECT_RESOLVED) {
1350 # if defined(OBJFORMAT_ELF)
1351 r = ocResolve_ELF ( oc );
1352 # elif defined(OBJFORMAT_PEi386)
1353 r = ocResolve_PEi386 ( oc );
1354 # elif defined(OBJFORMAT_MACHO)
1355 r = ocResolve_MachO ( oc );
1357 barf("resolveObjs: not implemented on this platform");
1359 if (!r) { return r; }
1360 oc->status = OBJECT_RESOLVED;
1366 /* -----------------------------------------------------------------------------
1367 * delete an object from the pool
1370 unloadObj( char *path )
1372 ObjectCode *oc, *prev;
1374 ASSERT(symhash != NULL);
1375 ASSERT(objects != NULL);
1380 for (oc = objects; oc; prev = oc, oc = oc->next) {
1381 if (!strcmp(oc->fileName,path)) {
1383 /* Remove all the mappings for the symbols within this
1388 for (i = 0; i < oc->n_symbols; i++) {
1389 if (oc->symbols[i] != NULL) {
1390 removeStrHashTable(symhash, oc->symbols[i], NULL);
1398 prev->next = oc->next;
1401 /* We're going to leave this in place, in case there are
1402 any pointers from the heap into it: */
1403 /* stgFree(oc->image); */
1404 stgFree(oc->fileName);
1405 stgFree(oc->symbols);
1406 stgFree(oc->sections);
1407 /* The local hash table should have been freed at the end
1408 of the ocResolve_ call on it. */
1409 ASSERT(oc->lochash == NULL);
1415 errorBelch("unloadObj: can't find `%s' to unload", path);
1419 /* -----------------------------------------------------------------------------
1420 * Sanity checking. For each ObjectCode, maintain a list of address ranges
1421 * which may be prodded during relocation, and abort if we try and write
1422 * outside any of these.
1424 static void addProddableBlock ( ObjectCode* oc, void* start, int size )
1427 = stgMallocBytes(sizeof(ProddableBlock), "addProddableBlock");
1428 /* debugBelch("aPB %p %p %d\n", oc, start, size); */
1432 pb->next = oc->proddables;
1433 oc->proddables = pb;
1436 static void checkProddableBlock ( ObjectCode* oc, void* addr )
1439 for (pb = oc->proddables; pb != NULL; pb = pb->next) {
1440 char* s = (char*)(pb->start);
1441 char* e = s + pb->size - 1;
1442 char* a = (char*)addr;
1443 /* Assumes that the biggest fixup involves a 4-byte write. This
1444 probably needs to be changed to 8 (ie, +7) on 64-bit
1446 if (a >= s && (a+3) <= e) return;
1448 barf("checkProddableBlock: invalid fixup in runtime linker");
1451 /* -----------------------------------------------------------------------------
1452 * Section management.
1454 static void addSection ( ObjectCode* oc, SectionKind kind,
1455 void* start, void* end )
1457 Section* s = stgMallocBytes(sizeof(Section), "addSection");
1461 s->next = oc->sections;
1464 debugBelch("addSection: %p-%p (size %d), kind %d\n",
1465 start, ((char*)end)-1, end - start + 1, kind );
1470 /* --------------------------------------------------------------------------
1471 * PowerPC specifics (jump islands)
1472 * ------------------------------------------------------------------------*/
1474 #if defined(powerpc_HOST_ARCH)
1477 ocAllocateJumpIslands
1479 Allocate additional space at the end of the object file image to make room
1482 PowerPC relative branch instructions have a 24 bit displacement field.
1483 As PPC code is always 4-byte-aligned, this yields a +-32MB range.
1484 If a particular imported symbol is outside this range, we have to redirect
1485 the jump to a short piece of new code that just loads the 32bit absolute
1486 address and jumps there.
1487 This function just allocates space for one 16 byte ppcJumpIsland for every
1488 undefined symbol in the object file. The code for the islands is filled in by
1489 makeJumpIsland below.
1492 static int ocAllocateJumpIslands( ObjectCode* oc, int count, int first )
1498 int misalignment = 0;
1500 misalignment = oc->misalignment;
1505 // round up to the nearest 4
1506 aligned = (oc->fileSize + 3) & ~3;
1509 #ifndef linux_HOST_OS /* mremap is a linux extension */
1510 #error ocAllocateJumpIslands doesnt want USE_MMAP to be defined
1513 pagesize = getpagesize();
1514 n = ROUND_UP( oc->fileSize, pagesize );
1515 m = ROUND_UP( aligned + sizeof (ppcJumpIsland) * count, pagesize );
1517 /* If we have a half-page-size file and map one page of it then
1518 * the part of the page after the size of the file remains accessible.
1519 * If, however, we map in 2 pages, the 2nd page is not accessible
1520 * and will give a "Bus Error" on access. To get around this, we check
1521 * if we need any extra pages for the jump islands and map them in
1522 * anonymously. We must check that we actually require extra pages
1523 * otherwise the attempt to mmap 0 pages of anonymous memory will
1529 /* The effect of this mremap() call is only the ensure that we have
1530 * a sufficient number of virtually contiguous pages. As returned from
1531 * mremap, the pages past the end of the file are not backed. We give
1532 * them a backing by using MAP_FIXED to map in anonymous pages.
1534 oc->image = mremap( oc->image, n, m, MREMAP_MAYMOVE );
1536 if( oc->image == MAP_FAILED )
1538 errorBelch( "Unable to mremap for Jump Islands\n" );
1542 if( mmap( oc->image + n, m - n, PROT_READ | PROT_WRITE | PROT_EXEC,
1543 MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED, 0, 0 ) == MAP_FAILED )
1545 errorBelch( "Unable to mmap( MAP_FIXED ) for Jump Islands\n" );
1551 oc->image -= misalignment;
1552 oc->image = stgReallocBytes( oc->image,
1554 aligned + sizeof (ppcJumpIsland) * count,
1555 "ocAllocateJumpIslands" );
1556 oc->image += misalignment;
1557 #endif /* USE_MMAP */
1559 oc->jump_islands = (ppcJumpIsland *) (oc->image + aligned);
1560 memset( oc->jump_islands, 0, sizeof (ppcJumpIsland) * count );
1563 oc->jump_islands = NULL;
1565 oc->island_start_symbol = first;
1566 oc->n_islands = count;
1571 static unsigned long makeJumpIsland( ObjectCode* oc,
1572 unsigned long symbolNumber,
1573 unsigned long target )
1575 ppcJumpIsland *island;
1577 if( symbolNumber < oc->island_start_symbol ||
1578 symbolNumber - oc->island_start_symbol > oc->n_islands)
1581 island = &oc->jump_islands[symbolNumber - oc->island_start_symbol];
1583 // lis r12, hi16(target)
1584 island->lis_r12 = 0x3d80;
1585 island->hi_addr = target >> 16;
1587 // ori r12, r12, lo16(target)
1588 island->ori_r12_r12 = 0x618c;
1589 island->lo_addr = target & 0xffff;
1592 island->mtctr_r12 = 0x7d8903a6;
1595 island->bctr = 0x4e800420;
1597 return (unsigned long) island;
1601 ocFlushInstructionCache
1603 Flush the data & instruction caches.
1604 Because the PPC has split data/instruction caches, we have to
1605 do that whenever we modify code at runtime.
1608 static void ocFlushInstructionCache( ObjectCode *oc )
1610 int n = (oc->fileSize + sizeof( ppcJumpIsland ) * oc->n_islands + 3) / 4;
1611 unsigned long *p = (unsigned long *) oc->image;
1615 __asm__ volatile ( "dcbf 0,%0\n\t"
1623 __asm__ volatile ( "sync\n\t"
1629 /* --------------------------------------------------------------------------
1630 * PEi386 specifics (Win32 targets)
1631 * ------------------------------------------------------------------------*/
1633 /* The information for this linker comes from
1634 Microsoft Portable Executable
1635 and Common Object File Format Specification
1636 revision 5.1 January 1998
1637 which SimonM says comes from the MS Developer Network CDs.
1639 It can be found there (on older CDs), but can also be found
1642 http://www.microsoft.com/hwdev/hardware/PECOFF.asp
1644 (this is Rev 6.0 from February 1999).
1646 Things move, so if that fails, try searching for it via
1648 http://www.google.com/search?q=PE+COFF+specification
1650 The ultimate reference for the PE format is the Winnt.h
1651 header file that comes with the Platform SDKs; as always,
1652 implementations will drift wrt their documentation.
1654 A good background article on the PE format is Matt Pietrek's
1655 March 1994 article in Microsoft System Journal (MSJ)
1656 (Vol.9, No. 3): "Peering Inside the PE: A Tour of the
1657 Win32 Portable Executable File Format." The info in there
1658 has recently been updated in a two part article in
1659 MSDN magazine, issues Feb and March 2002,
1660 "Inside Windows: An In-Depth Look into the Win32 Portable
1661 Executable File Format"
1663 John Levine's book "Linkers and Loaders" contains useful
1668 #if defined(OBJFORMAT_PEi386)
1672 typedef unsigned char UChar;
1673 typedef unsigned short UInt16;
1674 typedef unsigned int UInt32;
1681 UInt16 NumberOfSections;
1682 UInt32 TimeDateStamp;
1683 UInt32 PointerToSymbolTable;
1684 UInt32 NumberOfSymbols;
1685 UInt16 SizeOfOptionalHeader;
1686 UInt16 Characteristics;
1690 #define sizeof_COFF_header 20
1697 UInt32 VirtualAddress;
1698 UInt32 SizeOfRawData;
1699 UInt32 PointerToRawData;
1700 UInt32 PointerToRelocations;
1701 UInt32 PointerToLinenumbers;
1702 UInt16 NumberOfRelocations;
1703 UInt16 NumberOfLineNumbers;
1704 UInt32 Characteristics;
1708 #define sizeof_COFF_section 40
1715 UInt16 SectionNumber;
1718 UChar NumberOfAuxSymbols;
1722 #define sizeof_COFF_symbol 18
1727 UInt32 VirtualAddress;
1728 UInt32 SymbolTableIndex;
1733 #define sizeof_COFF_reloc 10
1736 /* From PE spec doc, section 3.3.2 */
1737 /* Note use of MYIMAGE_* since IMAGE_* are already defined in
1738 windows.h -- for the same purpose, but I want to know what I'm
1740 #define MYIMAGE_FILE_RELOCS_STRIPPED 0x0001
1741 #define MYIMAGE_FILE_EXECUTABLE_IMAGE 0x0002
1742 #define MYIMAGE_FILE_DLL 0x2000
1743 #define MYIMAGE_FILE_SYSTEM 0x1000
1744 #define MYIMAGE_FILE_BYTES_REVERSED_HI 0x8000
1745 #define MYIMAGE_FILE_BYTES_REVERSED_LO 0x0080
1746 #define MYIMAGE_FILE_32BIT_MACHINE 0x0100
1748 /* From PE spec doc, section 5.4.2 and 5.4.4 */
1749 #define MYIMAGE_SYM_CLASS_EXTERNAL 2
1750 #define MYIMAGE_SYM_CLASS_STATIC 3
1751 #define MYIMAGE_SYM_UNDEFINED 0
1753 /* From PE spec doc, section 4.1 */
1754 #define MYIMAGE_SCN_CNT_CODE 0x00000020
1755 #define MYIMAGE_SCN_CNT_INITIALIZED_DATA 0x00000040
1756 #define MYIMAGE_SCN_LNK_NRELOC_OVFL 0x01000000
1758 /* From PE spec doc, section 5.2.1 */
1759 #define MYIMAGE_REL_I386_DIR32 0x0006
1760 #define MYIMAGE_REL_I386_REL32 0x0014
1763 /* We use myindex to calculate array addresses, rather than
1764 simply doing the normal subscript thing. That's because
1765 some of the above structs have sizes which are not
1766 a whole number of words. GCC rounds their sizes up to a
1767 whole number of words, which means that the address calcs
1768 arising from using normal C indexing or pointer arithmetic
1769 are just plain wrong. Sigh.
1772 myindex ( int scale, void* base, int index )
1775 ((UChar*)base) + scale * index;
1780 printName ( UChar* name, UChar* strtab )
1782 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
1783 UInt32 strtab_offset = * (UInt32*)(name+4);
1784 debugBelch("%s", strtab + strtab_offset );
1787 for (i = 0; i < 8; i++) {
1788 if (name[i] == 0) break;
1789 debugBelch("%c", name[i] );
1796 copyName ( UChar* name, UChar* strtab, UChar* dst, int dstSize )
1798 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
1799 UInt32 strtab_offset = * (UInt32*)(name+4);
1800 strncpy ( dst, strtab+strtab_offset, dstSize );
1806 if (name[i] == 0) break;
1816 cstring_from_COFF_symbol_name ( UChar* name, UChar* strtab )
1819 /* If the string is longer than 8 bytes, look in the
1820 string table for it -- this will be correctly zero terminated.
1822 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
1823 UInt32 strtab_offset = * (UInt32*)(name+4);
1824 return ((UChar*)strtab) + strtab_offset;
1826 /* Otherwise, if shorter than 8 bytes, return the original,
1827 which by defn is correctly terminated.
1829 if (name[7]==0) return name;
1830 /* The annoying case: 8 bytes. Copy into a temporary
1831 (which is never freed ...)
1833 newstr = stgMallocBytes(9, "cstring_from_COFF_symbol_name");
1835 strncpy(newstr,name,8);
1841 /* Just compares the short names (first 8 chars) */
1842 static COFF_section *
1843 findPEi386SectionCalled ( ObjectCode* oc, char* name )
1847 = (COFF_header*)(oc->image);
1848 COFF_section* sectab
1850 ((UChar*)(oc->image))
1851 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
1853 for (i = 0; i < hdr->NumberOfSections; i++) {
1856 COFF_section* section_i
1858 myindex ( sizeof_COFF_section, sectab, i );
1859 n1 = (UChar*) &(section_i->Name);
1861 if (n1[0]==n2[0] && n1[1]==n2[1] && n1[2]==n2[2] &&
1862 n1[3]==n2[3] && n1[4]==n2[4] && n1[5]==n2[5] &&
1863 n1[6]==n2[6] && n1[7]==n2[7])
1872 zapTrailingAtSign ( UChar* sym )
1874 # define my_isdigit(c) ((c) >= '0' && (c) <= '9')
1876 if (sym[0] == 0) return;
1878 while (sym[i] != 0) i++;
1881 while (j > 0 && my_isdigit(sym[j])) j--;
1882 if (j > 0 && sym[j] == '@' && j != i) sym[j] = 0;
1888 ocVerifyImage_PEi386 ( ObjectCode* oc )
1893 COFF_section* sectab;
1894 COFF_symbol* symtab;
1896 /* debugBelch("\nLOADING %s\n", oc->fileName); */
1897 hdr = (COFF_header*)(oc->image);
1898 sectab = (COFF_section*) (
1899 ((UChar*)(oc->image))
1900 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
1902 symtab = (COFF_symbol*) (
1903 ((UChar*)(oc->image))
1904 + hdr->PointerToSymbolTable
1906 strtab = ((UChar*)symtab)
1907 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
1909 if (hdr->Machine != 0x14c) {
1910 errorBelch("%s: Not x86 PEi386", oc->fileName);
1913 if (hdr->SizeOfOptionalHeader != 0) {
1914 errorBelch("%s: PEi386 with nonempty optional header", oc->fileName);
1917 if ( /* (hdr->Characteristics & MYIMAGE_FILE_RELOCS_STRIPPED) || */
1918 (hdr->Characteristics & MYIMAGE_FILE_EXECUTABLE_IMAGE) ||
1919 (hdr->Characteristics & MYIMAGE_FILE_DLL) ||
1920 (hdr->Characteristics & MYIMAGE_FILE_SYSTEM) ) {
1921 errorBelch("%s: Not a PEi386 object file", oc->fileName);
1924 if ( (hdr->Characteristics & MYIMAGE_FILE_BYTES_REVERSED_HI)
1925 /* || !(hdr->Characteristics & MYIMAGE_FILE_32BIT_MACHINE) */ ) {
1926 errorBelch("%s: Invalid PEi386 word size or endiannness: %d",
1928 (int)(hdr->Characteristics));
1931 /* If the string table size is way crazy, this might indicate that
1932 there are more than 64k relocations, despite claims to the
1933 contrary. Hence this test. */
1934 /* debugBelch("strtab size %d\n", * (UInt32*)strtab); */
1936 if ( (*(UInt32*)strtab) > 600000 ) {
1937 /* Note that 600k has no special significance other than being
1938 big enough to handle the almost-2MB-sized lumps that
1939 constitute HSwin32*.o. */
1940 debugBelch("PEi386 object has suspiciously large string table; > 64k relocs?");
1945 /* No further verification after this point; only debug printing. */
1947 IF_DEBUG(linker, i=1);
1948 if (i == 0) return 1;
1950 debugBelch( "sectab offset = %d\n", ((UChar*)sectab) - ((UChar*)hdr) );
1951 debugBelch( "symtab offset = %d\n", ((UChar*)symtab) - ((UChar*)hdr) );
1952 debugBelch( "strtab offset = %d\n", ((UChar*)strtab) - ((UChar*)hdr) );
1955 debugBelch( "Machine: 0x%x\n", (UInt32)(hdr->Machine) );
1956 debugBelch( "# sections: %d\n", (UInt32)(hdr->NumberOfSections) );
1957 debugBelch( "time/date: 0x%x\n", (UInt32)(hdr->TimeDateStamp) );
1958 debugBelch( "symtab offset: %d\n", (UInt32)(hdr->PointerToSymbolTable) );
1959 debugBelch( "# symbols: %d\n", (UInt32)(hdr->NumberOfSymbols) );
1960 debugBelch( "sz of opt hdr: %d\n", (UInt32)(hdr->SizeOfOptionalHeader) );
1961 debugBelch( "characteristics: 0x%x\n", (UInt32)(hdr->Characteristics) );
1963 /* Print the section table. */
1965 for (i = 0; i < hdr->NumberOfSections; i++) {
1967 COFF_section* sectab_i
1969 myindex ( sizeof_COFF_section, sectab, i );
1976 printName ( sectab_i->Name, strtab );
1986 sectab_i->VirtualSize,
1987 sectab_i->VirtualAddress,
1988 sectab_i->SizeOfRawData,
1989 sectab_i->PointerToRawData,
1990 sectab_i->NumberOfRelocations,
1991 sectab_i->PointerToRelocations,
1992 sectab_i->PointerToRawData
1994 reltab = (COFF_reloc*) (
1995 ((UChar*)(oc->image)) + sectab_i->PointerToRelocations
1998 if ( sectab_i->Characteristics & MYIMAGE_SCN_LNK_NRELOC_OVFL ) {
1999 /* If the relocation field (a short) has overflowed, the
2000 * real count can be found in the first reloc entry.
2002 * See Section 4.1 (last para) of the PE spec (rev6.0).
2004 COFF_reloc* rel = (COFF_reloc*)
2005 myindex ( sizeof_COFF_reloc, reltab, 0 );
2006 noRelocs = rel->VirtualAddress;
2009 noRelocs = sectab_i->NumberOfRelocations;
2013 for (; j < noRelocs; j++) {
2015 COFF_reloc* rel = (COFF_reloc*)
2016 myindex ( sizeof_COFF_reloc, reltab, j );
2018 " type 0x%-4x vaddr 0x%-8x name `",
2020 rel->VirtualAddress );
2021 sym = (COFF_symbol*)
2022 myindex ( sizeof_COFF_symbol, symtab, rel->SymbolTableIndex );
2023 /* Hmm..mysterious looking offset - what's it for? SOF */
2024 printName ( sym->Name, strtab -10 );
2031 debugBelch("string table has size 0x%x\n", * (UInt32*)strtab );
2032 debugBelch("---START of string table---\n");
2033 for (i = 4; i < *(Int32*)strtab; i++) {
2035 debugBelch("\n"); else
2036 debugBelch("%c", strtab[i] );
2038 debugBelch("--- END of string table---\n");
2043 COFF_symbol* symtab_i;
2044 if (i >= (Int32)(hdr->NumberOfSymbols)) break;
2045 symtab_i = (COFF_symbol*)
2046 myindex ( sizeof_COFF_symbol, symtab, i );
2052 printName ( symtab_i->Name, strtab );
2061 (Int32)(symtab_i->SectionNumber),
2062 (UInt32)symtab_i->Type,
2063 (UInt32)symtab_i->StorageClass,
2064 (UInt32)symtab_i->NumberOfAuxSymbols
2066 i += symtab_i->NumberOfAuxSymbols;
2076 ocGetNames_PEi386 ( ObjectCode* oc )
2079 COFF_section* sectab;
2080 COFF_symbol* symtab;
2087 hdr = (COFF_header*)(oc->image);
2088 sectab = (COFF_section*) (
2089 ((UChar*)(oc->image))
2090 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2092 symtab = (COFF_symbol*) (
2093 ((UChar*)(oc->image))
2094 + hdr->PointerToSymbolTable
2096 strtab = ((UChar*)(oc->image))
2097 + hdr->PointerToSymbolTable
2098 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
2100 /* Allocate space for any (local, anonymous) .bss sections. */
2102 for (i = 0; i < hdr->NumberOfSections; i++) {
2105 COFF_section* sectab_i
2107 myindex ( sizeof_COFF_section, sectab, i );
2108 if (0 != strcmp(sectab_i->Name, ".bss")) continue;
2109 /* sof 10/05: the PE spec text isn't too clear regarding what
2110 * the SizeOfRawData field is supposed to hold for object
2111 * file sections containing just uninitialized data -- for executables,
2112 * it is supposed to be zero; unclear what it's supposed to be
2113 * for object files. However, VirtualSize is guaranteed to be
2114 * zero for object files, which definitely suggests that SizeOfRawData
2115 * will be non-zero (where else would the size of this .bss section be
2116 * stored?) Looking at the COFF_section info for incoming object files,
2117 * this certainly appears to be the case.
2119 * => I suspect we've been incorrectly handling .bss sections in (relocatable)
2120 * object files up until now. This turned out to bite us with ghc-6.4.1's use
2121 * of gcc-3.4.x, which has started to emit initially-zeroed-out local 'static'
2122 * variable decls into to the .bss section. (The specific function in Q which
2123 * triggered this is libraries/base/cbits/dirUtils.c:__hscore_getFolderPath())
2125 if (sectab_i->VirtualSize == 0 && sectab_i->SizeOfRawData == 0) continue;
2126 /* This is a non-empty .bss section. Allocate zeroed space for
2127 it, and set its PointerToRawData field such that oc->image +
2128 PointerToRawData == addr_of_zeroed_space. */
2129 bss_sz = sectab_i->VirtualSize;
2130 if ( bss_sz < sectab_i->SizeOfRawData) { bss_sz = sectab_i->SizeOfRawData; }
2131 zspace = stgCallocBytes(1, bss_sz, "ocGetNames_PEi386(anonymous bss)");
2132 sectab_i->PointerToRawData = ((UChar*)zspace) - ((UChar*)(oc->image));
2133 addProddableBlock(oc, zspace, bss_sz);
2134 /* debugBelch("BSS anon section at 0x%x\n", zspace); */
2137 /* Copy section information into the ObjectCode. */
2139 for (i = 0; i < hdr->NumberOfSections; i++) {
2145 = SECTIONKIND_OTHER;
2146 COFF_section* sectab_i
2148 myindex ( sizeof_COFF_section, sectab, i );
2149 IF_DEBUG(linker, debugBelch("section name = %s\n", sectab_i->Name ));
2152 /* I'm sure this is the Right Way to do it. However, the
2153 alternative of testing the sectab_i->Name field seems to
2154 work ok with Cygwin.
2156 if (sectab_i->Characteristics & MYIMAGE_SCN_CNT_CODE ||
2157 sectab_i->Characteristics & MYIMAGE_SCN_CNT_INITIALIZED_DATA)
2158 kind = SECTIONKIND_CODE_OR_RODATA;
2161 if (0==strcmp(".text",sectab_i->Name) ||
2162 0==strcmp(".rdata",sectab_i->Name)||
2163 0==strcmp(".rodata",sectab_i->Name))
2164 kind = SECTIONKIND_CODE_OR_RODATA;
2165 if (0==strcmp(".data",sectab_i->Name) ||
2166 0==strcmp(".bss",sectab_i->Name))
2167 kind = SECTIONKIND_RWDATA;
2169 ASSERT(sectab_i->SizeOfRawData == 0 || sectab_i->VirtualSize == 0);
2170 sz = sectab_i->SizeOfRawData;
2171 if (sz < sectab_i->VirtualSize) sz = sectab_i->VirtualSize;
2173 start = ((UChar*)(oc->image)) + sectab_i->PointerToRawData;
2174 end = start + sz - 1;
2176 if (kind == SECTIONKIND_OTHER
2177 /* Ignore sections called which contain stabs debugging
2179 && 0 != strcmp(".stab", sectab_i->Name)
2180 && 0 != strcmp(".stabstr", sectab_i->Name)
2181 /* ignore constructor section for now */
2182 && 0 != strcmp(".ctors", sectab_i->Name)
2183 /* ignore section generated from .ident */
2184 && 0!= strcmp("/4", sectab_i->Name)
2186 errorBelch("Unknown PEi386 section name `%s' (while processing: %s)", sectab_i->Name, oc->fileName);
2190 if (kind != SECTIONKIND_OTHER && end >= start) {
2191 addSection(oc, kind, start, end);
2192 addProddableBlock(oc, start, end - start + 1);
2196 /* Copy exported symbols into the ObjectCode. */
2198 oc->n_symbols = hdr->NumberOfSymbols;
2199 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
2200 "ocGetNames_PEi386(oc->symbols)");
2201 /* Call me paranoid; I don't care. */
2202 for (i = 0; i < oc->n_symbols; i++)
2203 oc->symbols[i] = NULL;
2207 COFF_symbol* symtab_i;
2208 if (i >= (Int32)(hdr->NumberOfSymbols)) break;
2209 symtab_i = (COFF_symbol*)
2210 myindex ( sizeof_COFF_symbol, symtab, i );
2214 if (symtab_i->StorageClass == MYIMAGE_SYM_CLASS_EXTERNAL
2215 && symtab_i->SectionNumber != MYIMAGE_SYM_UNDEFINED) {
2216 /* This symbol is global and defined, viz, exported */
2217 /* for MYIMAGE_SYMCLASS_EXTERNAL
2218 && !MYIMAGE_SYM_UNDEFINED,
2219 the address of the symbol is:
2220 address of relevant section + offset in section
2222 COFF_section* sectabent
2223 = (COFF_section*) myindex ( sizeof_COFF_section,
2225 symtab_i->SectionNumber-1 );
2226 addr = ((UChar*)(oc->image))
2227 + (sectabent->PointerToRawData
2231 if (symtab_i->SectionNumber == MYIMAGE_SYM_UNDEFINED
2232 && symtab_i->Value > 0) {
2233 /* This symbol isn't in any section at all, ie, global bss.
2234 Allocate zeroed space for it. */
2235 addr = stgCallocBytes(1, symtab_i->Value,
2236 "ocGetNames_PEi386(non-anonymous bss)");
2237 addSection(oc, SECTIONKIND_RWDATA, addr,
2238 ((UChar*)addr) + symtab_i->Value - 1);
2239 addProddableBlock(oc, addr, symtab_i->Value);
2240 /* debugBelch("BSS section at 0x%x\n", addr); */
2243 if (addr != NULL ) {
2244 sname = cstring_from_COFF_symbol_name ( symtab_i->Name, strtab );
2245 /* debugBelch("addSymbol %p `%s \n", addr,sname); */
2246 IF_DEBUG(linker, debugBelch("addSymbol %p `%s'\n", addr,sname);)
2247 ASSERT(i >= 0 && i < oc->n_symbols);
2248 /* cstring_from_COFF_symbol_name always succeeds. */
2249 oc->symbols[i] = sname;
2250 ghciInsertStrHashTable(oc->fileName, symhash, sname, addr);
2254 "IGNORING symbol %d\n"
2258 printName ( symtab_i->Name, strtab );
2267 (Int32)(symtab_i->SectionNumber),
2268 (UInt32)symtab_i->Type,
2269 (UInt32)symtab_i->StorageClass,
2270 (UInt32)symtab_i->NumberOfAuxSymbols
2275 i += symtab_i->NumberOfAuxSymbols;
2284 ocResolve_PEi386 ( ObjectCode* oc )
2287 COFF_section* sectab;
2288 COFF_symbol* symtab;
2298 /* ToDo: should be variable-sized? But is at least safe in the
2299 sense of buffer-overrun-proof. */
2301 /* debugBelch("resolving for %s\n", oc->fileName); */
2303 hdr = (COFF_header*)(oc->image);
2304 sectab = (COFF_section*) (
2305 ((UChar*)(oc->image))
2306 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2308 symtab = (COFF_symbol*) (
2309 ((UChar*)(oc->image))
2310 + hdr->PointerToSymbolTable
2312 strtab = ((UChar*)(oc->image))
2313 + hdr->PointerToSymbolTable
2314 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
2316 for (i = 0; i < hdr->NumberOfSections; i++) {
2317 COFF_section* sectab_i
2319 myindex ( sizeof_COFF_section, sectab, i );
2322 ((UChar*)(oc->image)) + sectab_i->PointerToRelocations
2325 /* Ignore sections called which contain stabs debugging
2327 if (0 == strcmp(".stab", sectab_i->Name)
2328 || 0 == strcmp(".stabstr", sectab_i->Name)
2329 || 0 == strcmp(".ctors", sectab_i->Name))
2332 if ( sectab_i->Characteristics & MYIMAGE_SCN_LNK_NRELOC_OVFL ) {
2333 /* If the relocation field (a short) has overflowed, the
2334 * real count can be found in the first reloc entry.
2336 * See Section 4.1 (last para) of the PE spec (rev6.0).
2338 * Nov2003 update: the GNU linker still doesn't correctly
2339 * handle the generation of relocatable object files with
2340 * overflown relocations. Hence the output to warn of potential
2343 COFF_reloc* rel = (COFF_reloc*)
2344 myindex ( sizeof_COFF_reloc, reltab, 0 );
2345 noRelocs = rel->VirtualAddress;
2347 /* 10/05: we now assume (and check for) a GNU ld that is capable
2348 * of handling object files with (>2^16) of relocs.
2351 debugBelch("WARNING: Overflown relocation field (# relocs found: %u)\n",
2356 noRelocs = sectab_i->NumberOfRelocations;
2361 for (; j < noRelocs; j++) {
2363 COFF_reloc* reltab_j
2365 myindex ( sizeof_COFF_reloc, reltab, j );
2367 /* the location to patch */
2369 ((UChar*)(oc->image))
2370 + (sectab_i->PointerToRawData
2371 + reltab_j->VirtualAddress
2372 - sectab_i->VirtualAddress )
2374 /* the existing contents of pP */
2376 /* the symbol to connect to */
2377 sym = (COFF_symbol*)
2378 myindex ( sizeof_COFF_symbol,
2379 symtab, reltab_j->SymbolTableIndex );
2382 "reloc sec %2d num %3d: type 0x%-4x "
2383 "vaddr 0x%-8x name `",
2385 (UInt32)reltab_j->Type,
2386 reltab_j->VirtualAddress );
2387 printName ( sym->Name, strtab );
2388 debugBelch("'\n" ));
2390 if (sym->StorageClass == MYIMAGE_SYM_CLASS_STATIC) {
2391 COFF_section* section_sym
2392 = findPEi386SectionCalled ( oc, sym->Name );
2394 errorBelch("%s: can't find section `%s'", oc->fileName, sym->Name);
2397 S = ((UInt32)(oc->image))
2398 + (section_sym->PointerToRawData
2401 copyName ( sym->Name, strtab, symbol, 1000-1 );
2402 S = (UInt32) lookupLocalSymbol( oc, symbol );
2403 if ((void*)S != NULL) goto foundit;
2404 S = (UInt32) lookupSymbol( symbol );
2405 if ((void*)S != NULL) goto foundit;
2406 zapTrailingAtSign ( symbol );
2407 S = (UInt32) lookupLocalSymbol( oc, symbol );
2408 if ((void*)S != NULL) goto foundit;
2409 S = (UInt32) lookupSymbol( symbol );
2410 if ((void*)S != NULL) goto foundit;
2411 /* Newline first because the interactive linker has printed "linking..." */
2412 errorBelch("\n%s: unknown symbol `%s'", oc->fileName, symbol);
2416 checkProddableBlock(oc, pP);
2417 switch (reltab_j->Type) {
2418 case MYIMAGE_REL_I386_DIR32:
2421 case MYIMAGE_REL_I386_REL32:
2422 /* Tricky. We have to insert a displacement at
2423 pP which, when added to the PC for the _next_
2424 insn, gives the address of the target (S).
2425 Problem is to know the address of the next insn
2426 when we only know pP. We assume that this
2427 literal field is always the last in the insn,
2428 so that the address of the next insn is pP+4
2429 -- hence the constant 4.
2430 Also I don't know if A should be added, but so
2431 far it has always been zero.
2433 SOF 05/2005: 'A' (old contents of *pP) have been observed
2434 to contain values other than zero (the 'wx' object file
2435 that came with wxhaskell-0.9.4; dunno how it was compiled..).
2436 So, add displacement to old value instead of asserting
2437 A to be zero. Fixes wxhaskell-related crashes, and no other
2438 ill effects have been observed.
2440 Update: the reason why we're seeing these more elaborate
2441 relocations is due to a switch in how the NCG compiles SRTs
2442 and offsets to them from info tables. SRTs live in .(ro)data,
2443 while info tables live in .text, causing GAS to emit REL32/DISP32
2444 relocations with non-zero values. Adding the displacement is
2445 the right thing to do.
2447 *pP = S - ((UInt32)pP) - 4 + A;
2450 debugBelch("%s: unhandled PEi386 relocation type %d",
2451 oc->fileName, reltab_j->Type);
2458 IF_DEBUG(linker, debugBelch("completed %s", oc->fileName));
2462 #endif /* defined(OBJFORMAT_PEi386) */
2465 /* --------------------------------------------------------------------------
2467 * ------------------------------------------------------------------------*/
2469 #if defined(OBJFORMAT_ELF)
2474 #if defined(sparc_HOST_ARCH)
2475 # define ELF_TARGET_SPARC /* Used inside <elf.h> */
2476 #elif defined(i386_HOST_ARCH)
2477 # define ELF_TARGET_386 /* Used inside <elf.h> */
2478 #elif defined(x86_64_HOST_ARCH)
2479 # define ELF_TARGET_X64_64
2481 #elif defined (ia64_HOST_ARCH)
2482 # define ELF_TARGET_IA64 /* Used inside <elf.h> */
2484 # define ELF_FUNCTION_DESC /* calling convention uses function descriptors */
2485 # define ELF_NEED_GOT /* needs Global Offset Table */
2486 # define ELF_NEED_PLT /* needs Procedure Linkage Tables */
2489 #if !defined(openbsd_HOST_OS)
2492 /* openbsd elf has things in different places, with diff names */
2493 #include <elf_abi.h>
2494 #include <machine/reloc.h>
2495 #define R_386_32 RELOC_32
2496 #define R_386_PC32 RELOC_PC32
2500 * Define a set of types which can be used for both ELF32 and ELF64
2504 #define ELFCLASS ELFCLASS64
2505 #define Elf_Addr Elf64_Addr
2506 #define Elf_Word Elf64_Word
2507 #define Elf_Sword Elf64_Sword
2508 #define Elf_Ehdr Elf64_Ehdr
2509 #define Elf_Phdr Elf64_Phdr
2510 #define Elf_Shdr Elf64_Shdr
2511 #define Elf_Sym Elf64_Sym
2512 #define Elf_Rel Elf64_Rel
2513 #define Elf_Rela Elf64_Rela
2514 #define ELF_ST_TYPE ELF64_ST_TYPE
2515 #define ELF_ST_BIND ELF64_ST_BIND
2516 #define ELF_R_TYPE ELF64_R_TYPE
2517 #define ELF_R_SYM ELF64_R_SYM
2519 #define ELFCLASS ELFCLASS32
2520 #define Elf_Addr Elf32_Addr
2521 #define Elf_Word Elf32_Word
2522 #define Elf_Sword Elf32_Sword
2523 #define Elf_Ehdr Elf32_Ehdr
2524 #define Elf_Phdr Elf32_Phdr
2525 #define Elf_Shdr Elf32_Shdr
2526 #define Elf_Sym Elf32_Sym
2527 #define Elf_Rel Elf32_Rel
2528 #define Elf_Rela Elf32_Rela
2530 #define ELF_ST_TYPE ELF32_ST_TYPE
2533 #define ELF_ST_BIND ELF32_ST_BIND
2536 #define ELF_R_TYPE ELF32_R_TYPE
2539 #define ELF_R_SYM ELF32_R_SYM
2545 * Functions to allocate entries in dynamic sections. Currently we simply
2546 * preallocate a large number, and we don't check if a entry for the given
2547 * target already exists (a linear search is too slow). Ideally these
2548 * entries would be associated with symbols.
2551 /* These sizes sufficient to load HSbase + HShaskell98 + a few modules */
2552 #define GOT_SIZE 0x20000
2553 #define FUNCTION_TABLE_SIZE 0x10000
2554 #define PLT_SIZE 0x08000
2557 static Elf_Addr got[GOT_SIZE];
2558 static unsigned int gotIndex;
2559 static Elf_Addr gp_val = (Elf_Addr)got;
2562 allocateGOTEntry(Elf_Addr target)
2566 if (gotIndex >= GOT_SIZE)
2567 barf("Global offset table overflow");
2569 entry = &got[gotIndex++];
2571 return (Elf_Addr)entry;
2575 #ifdef ELF_FUNCTION_DESC
2581 static FunctionDesc functionTable[FUNCTION_TABLE_SIZE];
2582 static unsigned int functionTableIndex;
2585 allocateFunctionDesc(Elf_Addr target)
2587 FunctionDesc *entry;
2589 if (functionTableIndex >= FUNCTION_TABLE_SIZE)
2590 barf("Function table overflow");
2592 entry = &functionTable[functionTableIndex++];
2594 entry->gp = (Elf_Addr)gp_val;
2595 return (Elf_Addr)entry;
2599 copyFunctionDesc(Elf_Addr target)
2601 FunctionDesc *olddesc = (FunctionDesc *)target;
2602 FunctionDesc *newdesc;
2604 newdesc = (FunctionDesc *)allocateFunctionDesc(olddesc->ip);
2605 newdesc->gp = olddesc->gp;
2606 return (Elf_Addr)newdesc;
2611 #ifdef ia64_HOST_ARCH
2612 static void ia64_reloc_gprel22(Elf_Addr target, Elf_Addr value);
2613 static void ia64_reloc_pcrel21(Elf_Addr target, Elf_Addr value, ObjectCode *oc);
2615 static unsigned char plt_code[] =
2617 /* taken from binutils bfd/elfxx-ia64.c */
2618 0x0b, 0x78, 0x00, 0x02, 0x00, 0x24, /* [MMI] addl r15=0,r1;; */
2619 0x00, 0x41, 0x3c, 0x30, 0x28, 0xc0, /* ld8 r16=[r15],8 */
2620 0x01, 0x08, 0x00, 0x84, /* mov r14=r1;; */
2621 0x11, 0x08, 0x00, 0x1e, 0x18, 0x10, /* [MIB] ld8 r1=[r15] */
2622 0x60, 0x80, 0x04, 0x80, 0x03, 0x00, /* mov b6=r16 */
2623 0x60, 0x00, 0x80, 0x00 /* br.few b6;; */
2626 /* If we can't get to the function descriptor via gp, take a local copy of it */
2627 #define PLT_RELOC(code, target) { \
2628 Elf64_Sxword rel_value = target - gp_val; \
2629 if ((rel_value > 0x1fffff) || (rel_value < -0x1fffff)) \
2630 ia64_reloc_gprel22((Elf_Addr)code, copyFunctionDesc(target)); \
2632 ia64_reloc_gprel22((Elf_Addr)code, target); \
2637 unsigned char code[sizeof(plt_code)];
2641 allocatePLTEntry(Elf_Addr target, ObjectCode *oc)
2643 PLTEntry *plt = (PLTEntry *)oc->plt;
2646 if (oc->pltIndex >= PLT_SIZE)
2647 barf("Procedure table overflow");
2649 entry = &plt[oc->pltIndex++];
2650 memcpy(entry->code, plt_code, sizeof(entry->code));
2651 PLT_RELOC(entry->code, target);
2652 return (Elf_Addr)entry;
2658 return (PLT_SIZE * sizeof(PLTEntry));
2663 #if x86_64_HOST_ARCH
2664 // On x86_64, 32-bit relocations are often used, which requires that
2665 // we can resolve a symbol to a 32-bit offset. However, shared
2666 // libraries are placed outside the 2Gb area, which leaves us with a
2667 // problem when we need to give a 32-bit offset to a symbol in a
2670 // For a function symbol, we can allocate a bounce sequence inside the
2671 // 2Gb area and resolve the symbol to this. The bounce sequence is
2672 // simply a long jump instruction to the real location of the symbol.
2674 // For data references, we're screwed.
2677 unsigned char jmp[8]; /* 6 byte instruction: jmpq *0x00000002(%rip) */
2681 #define X86_64_BB_SIZE 1024
2683 static x86_64_bounce *x86_64_bounce_buffer = NULL;
2684 static nat x86_64_bb_next_off;
2687 x86_64_high_symbol( char *lbl, void *addr )
2689 x86_64_bounce *bounce;
2691 if ( x86_64_bounce_buffer == NULL ||
2692 x86_64_bb_next_off >= X86_64_BB_SIZE ) {
2693 x86_64_bounce_buffer =
2694 mmap(NULL, X86_64_BB_SIZE * sizeof(x86_64_bounce),
2695 PROT_EXEC|PROT_READ|PROT_WRITE,
2696 MAP_PRIVATE|MAP_32BIT|MAP_ANONYMOUS, -1, 0);
2697 if (x86_64_bounce_buffer == MAP_FAILED) {
2698 barf("x86_64_high_symbol: mmap failed");
2700 x86_64_bb_next_off = 0;
2702 bounce = &x86_64_bounce_buffer[x86_64_bb_next_off];
2703 bounce->jmp[0] = 0xff;
2704 bounce->jmp[1] = 0x25;
2705 bounce->jmp[2] = 0x02;
2706 bounce->jmp[3] = 0x00;
2707 bounce->jmp[4] = 0x00;
2708 bounce->jmp[5] = 0x00;
2709 bounce->addr = addr;
2710 x86_64_bb_next_off++;
2712 IF_DEBUG(linker, debugBelch("x86_64: allocated bounce entry for %s->%p at %p\n",
2713 lbl, addr, bounce));
2715 insertStrHashTable(symhash, lbl, bounce);
2722 * Generic ELF functions
2726 findElfSection ( void* objImage, Elf_Word sh_type )
2728 char* ehdrC = (char*)objImage;
2729 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2730 Elf_Shdr* shdr = (Elf_Shdr*)(ehdrC + ehdr->e_shoff);
2731 char* sh_strtab = ehdrC + shdr[ehdr->e_shstrndx].sh_offset;
2735 for (i = 0; i < ehdr->e_shnum; i++) {
2736 if (shdr[i].sh_type == sh_type
2737 /* Ignore the section header's string table. */
2738 && i != ehdr->e_shstrndx
2739 /* Ignore string tables named .stabstr, as they contain
2741 && 0 != memcmp(".stabstr", sh_strtab + shdr[i].sh_name, 8)
2743 ptr = ehdrC + shdr[i].sh_offset;
2750 #if defined(ia64_HOST_ARCH)
2752 findElfSegment ( void* objImage, Elf_Addr vaddr )
2754 char* ehdrC = (char*)objImage;
2755 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2756 Elf_Phdr* phdr = (Elf_Phdr*)(ehdrC + ehdr->e_phoff);
2757 Elf_Addr segaddr = 0;
2760 for (i = 0; i < ehdr->e_phnum; i++) {
2761 segaddr = phdr[i].p_vaddr;
2762 if ((vaddr >= segaddr) && (vaddr < segaddr + phdr[i].p_memsz))
2770 ocVerifyImage_ELF ( ObjectCode* oc )
2774 int i, j, nent, nstrtab, nsymtabs;
2778 char* ehdrC = (char*)(oc->image);
2779 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2781 if (ehdr->e_ident[EI_MAG0] != ELFMAG0 ||
2782 ehdr->e_ident[EI_MAG1] != ELFMAG1 ||
2783 ehdr->e_ident[EI_MAG2] != ELFMAG2 ||
2784 ehdr->e_ident[EI_MAG3] != ELFMAG3) {
2785 errorBelch("%s: not an ELF object", oc->fileName);
2789 if (ehdr->e_ident[EI_CLASS] != ELFCLASS) {
2790 errorBelch("%s: unsupported ELF format", oc->fileName);
2794 if (ehdr->e_ident[EI_DATA] == ELFDATA2LSB) {
2795 IF_DEBUG(linker,debugBelch( "Is little-endian\n" ));
2797 if (ehdr->e_ident[EI_DATA] == ELFDATA2MSB) {
2798 IF_DEBUG(linker,debugBelch( "Is big-endian\n" ));
2800 errorBelch("%s: unknown endiannness", oc->fileName);
2804 if (ehdr->e_type != ET_REL) {
2805 errorBelch("%s: not a relocatable object (.o) file", oc->fileName);
2808 IF_DEBUG(linker, debugBelch( "Is a relocatable object (.o) file\n" ));
2810 IF_DEBUG(linker,debugBelch( "Architecture is " ));
2811 switch (ehdr->e_machine) {
2812 case EM_386: IF_DEBUG(linker,debugBelch( "x86" )); break;
2813 #ifdef EM_SPARC32PLUS
2814 case EM_SPARC32PLUS:
2816 case EM_SPARC: IF_DEBUG(linker,debugBelch( "sparc" )); break;
2818 case EM_IA_64: IF_DEBUG(linker,debugBelch( "ia64" )); break;
2820 case EM_PPC: IF_DEBUG(linker,debugBelch( "powerpc32" )); break;
2822 case EM_X86_64: IF_DEBUG(linker,debugBelch( "x86_64" )); break;
2824 default: IF_DEBUG(linker,debugBelch( "unknown" ));
2825 errorBelch("%s: unknown architecture", oc->fileName);
2829 IF_DEBUG(linker,debugBelch(
2830 "\nSection header table: start %ld, n_entries %d, ent_size %d\n",
2831 (long)ehdr->e_shoff, ehdr->e_shnum, ehdr->e_shentsize ));
2833 ASSERT (ehdr->e_shentsize == sizeof(Elf_Shdr));
2835 shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
2837 if (ehdr->e_shstrndx == SHN_UNDEF) {
2838 errorBelch("%s: no section header string table", oc->fileName);
2841 IF_DEBUG(linker,debugBelch( "Section header string table is section %d\n",
2843 sh_strtab = ehdrC + shdr[ehdr->e_shstrndx].sh_offset;
2846 for (i = 0; i < ehdr->e_shnum; i++) {
2847 IF_DEBUG(linker,debugBelch("%2d: ", i ));
2848 IF_DEBUG(linker,debugBelch("type=%2d ", (int)shdr[i].sh_type ));
2849 IF_DEBUG(linker,debugBelch("size=%4d ", (int)shdr[i].sh_size ));
2850 IF_DEBUG(linker,debugBelch("offs=%4d ", (int)shdr[i].sh_offset ));
2851 IF_DEBUG(linker,debugBelch(" (%p .. %p) ",
2852 ehdrC + shdr[i].sh_offset,
2853 ehdrC + shdr[i].sh_offset + shdr[i].sh_size - 1));
2855 if (shdr[i].sh_type == SHT_REL) {
2856 IF_DEBUG(linker,debugBelch("Rel " ));
2857 } else if (shdr[i].sh_type == SHT_RELA) {
2858 IF_DEBUG(linker,debugBelch("RelA " ));
2860 IF_DEBUG(linker,debugBelch(" "));
2863 IF_DEBUG(linker,debugBelch("sname=%s\n", sh_strtab + shdr[i].sh_name ));
2867 IF_DEBUG(linker,debugBelch( "\nString tables" ));
2870 for (i = 0; i < ehdr->e_shnum; i++) {
2871 if (shdr[i].sh_type == SHT_STRTAB
2872 /* Ignore the section header's string table. */
2873 && i != ehdr->e_shstrndx
2874 /* Ignore string tables named .stabstr, as they contain
2876 && 0 != memcmp(".stabstr", sh_strtab + shdr[i].sh_name, 8)
2878 IF_DEBUG(linker,debugBelch(" section %d is a normal string table", i ));
2879 strtab = ehdrC + shdr[i].sh_offset;
2884 errorBelch("%s: no string tables, or too many", oc->fileName);
2889 IF_DEBUG(linker,debugBelch( "\nSymbol tables" ));
2890 for (i = 0; i < ehdr->e_shnum; i++) {
2891 if (shdr[i].sh_type != SHT_SYMTAB) continue;
2892 IF_DEBUG(linker,debugBelch( "section %d is a symbol table\n", i ));
2894 stab = (Elf_Sym*) (ehdrC + shdr[i].sh_offset);
2895 nent = shdr[i].sh_size / sizeof(Elf_Sym);
2896 IF_DEBUG(linker,debugBelch( " number of entries is apparently %d (%ld rem)\n",
2898 (long)shdr[i].sh_size % sizeof(Elf_Sym)
2900 if (0 != shdr[i].sh_size % sizeof(Elf_Sym)) {
2901 errorBelch("%s: non-integral number of symbol table entries", oc->fileName);
2904 for (j = 0; j < nent; j++) {
2905 IF_DEBUG(linker,debugBelch(" %2d ", j ));
2906 IF_DEBUG(linker,debugBelch(" sec=%-5d size=%-3d val=%5p ",
2907 (int)stab[j].st_shndx,
2908 (int)stab[j].st_size,
2909 (char*)stab[j].st_value ));
2911 IF_DEBUG(linker,debugBelch("type=" ));
2912 switch (ELF_ST_TYPE(stab[j].st_info)) {
2913 case STT_NOTYPE: IF_DEBUG(linker,debugBelch("notype " )); break;
2914 case STT_OBJECT: IF_DEBUG(linker,debugBelch("object " )); break;
2915 case STT_FUNC : IF_DEBUG(linker,debugBelch("func " )); break;
2916 case STT_SECTION: IF_DEBUG(linker,debugBelch("section" )); break;
2917 case STT_FILE: IF_DEBUG(linker,debugBelch("file " )); break;
2918 default: IF_DEBUG(linker,debugBelch("? " )); break;
2920 IF_DEBUG(linker,debugBelch(" " ));
2922 IF_DEBUG(linker,debugBelch("bind=" ));
2923 switch (ELF_ST_BIND(stab[j].st_info)) {
2924 case STB_LOCAL : IF_DEBUG(linker,debugBelch("local " )); break;
2925 case STB_GLOBAL: IF_DEBUG(linker,debugBelch("global" )); break;
2926 case STB_WEAK : IF_DEBUG(linker,debugBelch("weak " )); break;
2927 default: IF_DEBUG(linker,debugBelch("? " )); break;
2929 IF_DEBUG(linker,debugBelch(" " ));
2931 IF_DEBUG(linker,debugBelch("name=%s\n", strtab + stab[j].st_name ));
2935 if (nsymtabs == 0) {
2936 errorBelch("%s: didn't find any symbol tables", oc->fileName);
2943 static int getSectionKind_ELF( Elf_Shdr *hdr, int *is_bss )
2947 if (hdr->sh_type == SHT_PROGBITS
2948 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_EXECINSTR)) {
2949 /* .text-style section */
2950 return SECTIONKIND_CODE_OR_RODATA;
2953 if (hdr->sh_type == SHT_PROGBITS
2954 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_WRITE)) {
2955 /* .data-style section */
2956 return SECTIONKIND_RWDATA;
2959 if (hdr->sh_type == SHT_PROGBITS
2960 && (hdr->sh_flags & SHF_ALLOC) && !(hdr->sh_flags & SHF_WRITE)) {
2961 /* .rodata-style section */
2962 return SECTIONKIND_CODE_OR_RODATA;
2965 if (hdr->sh_type == SHT_NOBITS
2966 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_WRITE)) {
2967 /* .bss-style section */
2969 return SECTIONKIND_RWDATA;
2972 return SECTIONKIND_OTHER;
2977 ocGetNames_ELF ( ObjectCode* oc )
2982 char* ehdrC = (char*)(oc->image);
2983 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2984 char* strtab = findElfSection ( ehdrC, SHT_STRTAB );
2985 Elf_Shdr* shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
2987 ASSERT(symhash != NULL);
2990 errorBelch("%s: no strtab", oc->fileName);
2995 for (i = 0; i < ehdr->e_shnum; i++) {
2996 /* Figure out what kind of section it is. Logic derived from
2997 Figure 1.14 ("Special Sections") of the ELF document
2998 ("Portable Formats Specification, Version 1.1"). */
3000 SectionKind kind = getSectionKind_ELF(&shdr[i], &is_bss);
3002 if (is_bss && shdr[i].sh_size > 0) {
3003 /* This is a non-empty .bss section. Allocate zeroed space for
3004 it, and set its .sh_offset field such that
3005 ehdrC + .sh_offset == addr_of_zeroed_space. */
3006 char* zspace = stgCallocBytes(1, shdr[i].sh_size,
3007 "ocGetNames_ELF(BSS)");
3008 shdr[i].sh_offset = ((char*)zspace) - ((char*)ehdrC);
3010 debugBelch("BSS section at 0x%x, size %d\n",
3011 zspace, shdr[i].sh_size);
3015 /* fill in the section info */
3016 if (kind != SECTIONKIND_OTHER && shdr[i].sh_size > 0) {
3017 addProddableBlock(oc, ehdrC + shdr[i].sh_offset, shdr[i].sh_size);
3018 addSection(oc, kind, ehdrC + shdr[i].sh_offset,
3019 ehdrC + shdr[i].sh_offset + shdr[i].sh_size - 1);
3022 if (shdr[i].sh_type != SHT_SYMTAB) continue;
3024 /* copy stuff into this module's object symbol table */
3025 stab = (Elf_Sym*) (ehdrC + shdr[i].sh_offset);
3026 nent = shdr[i].sh_size / sizeof(Elf_Sym);
3028 oc->n_symbols = nent;
3029 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
3030 "ocGetNames_ELF(oc->symbols)");
3032 for (j = 0; j < nent; j++) {
3034 char isLocal = FALSE; /* avoids uninit-var warning */
3036 char* nm = strtab + stab[j].st_name;
3037 int secno = stab[j].st_shndx;
3039 /* Figure out if we want to add it; if so, set ad to its
3040 address. Otherwise leave ad == NULL. */
3042 if (secno == SHN_COMMON) {
3044 ad = stgCallocBytes(1, stab[j].st_size, "ocGetNames_ELF(COMMON)");
3046 debugBelch("COMMON symbol, size %d name %s\n",
3047 stab[j].st_size, nm);
3049 /* Pointless to do addProddableBlock() for this area,
3050 since the linker should never poke around in it. */
3053 if ( ( ELF_ST_BIND(stab[j].st_info)==STB_GLOBAL
3054 || ELF_ST_BIND(stab[j].st_info)==STB_LOCAL
3056 /* and not an undefined symbol */
3057 && stab[j].st_shndx != SHN_UNDEF
3058 /* and not in a "special section" */
3059 && stab[j].st_shndx < SHN_LORESERVE
3061 /* and it's a not a section or string table or anything silly */
3062 ( ELF_ST_TYPE(stab[j].st_info)==STT_FUNC ||
3063 ELF_ST_TYPE(stab[j].st_info)==STT_OBJECT ||
3064 ELF_ST_TYPE(stab[j].st_info)==STT_NOTYPE
3067 /* Section 0 is the undefined section, hence > and not >=. */
3068 ASSERT(secno > 0 && secno < ehdr->e_shnum);
3070 if (shdr[secno].sh_type == SHT_NOBITS) {
3071 debugBelch(" BSS symbol, size %d off %d name %s\n",
3072 stab[j].st_size, stab[j].st_value, nm);
3075 ad = ehdrC + shdr[ secno ].sh_offset + stab[j].st_value;
3076 if (ELF_ST_BIND(stab[j].st_info)==STB_LOCAL) {
3079 #ifdef ELF_FUNCTION_DESC
3080 /* dlsym() and the initialisation table both give us function
3081 * descriptors, so to be consistent we store function descriptors
3082 * in the symbol table */
3083 if (ELF_ST_TYPE(stab[j].st_info) == STT_FUNC)
3084 ad = (char *)allocateFunctionDesc((Elf_Addr)ad);
3086 IF_DEBUG(linker,debugBelch( "addOTabName(GLOB): %10p %s %s",
3087 ad, oc->fileName, nm ));
3092 /* And the decision is ... */
3096 oc->symbols[j] = nm;
3099 /* Ignore entirely. */
3101 ghciInsertStrHashTable(oc->fileName, symhash, nm, ad);
3105 IF_DEBUG(linker,debugBelch( "skipping `%s'\n",
3106 strtab + stab[j].st_name ));
3109 "skipping bind = %d, type = %d, shndx = %d `%s'\n",
3110 (int)ELF_ST_BIND(stab[j].st_info),
3111 (int)ELF_ST_TYPE(stab[j].st_info),
3112 (int)stab[j].st_shndx,
3113 strtab + stab[j].st_name
3116 oc->symbols[j] = NULL;
3125 /* Do ELF relocations which lack an explicit addend. All x86-linux
3126 relocations appear to be of this form. */
3128 do_Elf_Rel_relocations ( ObjectCode* oc, char* ehdrC,
3129 Elf_Shdr* shdr, int shnum,
3130 Elf_Sym* stab, char* strtab )
3135 Elf_Rel* rtab = (Elf_Rel*) (ehdrC + shdr[shnum].sh_offset);
3136 int nent = shdr[shnum].sh_size / sizeof(Elf_Rel);
3137 int target_shndx = shdr[shnum].sh_info;
3138 int symtab_shndx = shdr[shnum].sh_link;
3140 stab = (Elf_Sym*) (ehdrC + shdr[ symtab_shndx ].sh_offset);
3141 targ = (Elf_Word*)(ehdrC + shdr[ target_shndx ].sh_offset);
3142 IF_DEBUG(linker,debugBelch( "relocations for section %d using symtab %d\n",
3143 target_shndx, symtab_shndx ));
3145 /* Skip sections that we're not interested in. */
3148 SectionKind kind = getSectionKind_ELF(&shdr[target_shndx], &is_bss);
3149 if (kind == SECTIONKIND_OTHER) {
3150 IF_DEBUG(linker,debugBelch( "skipping (target section not loaded)"));
3155 for (j = 0; j < nent; j++) {
3156 Elf_Addr offset = rtab[j].r_offset;
3157 Elf_Addr info = rtab[j].r_info;
3159 Elf_Addr P = ((Elf_Addr)targ) + offset;
3160 Elf_Word* pP = (Elf_Word*)P;
3165 StgStablePtr stablePtr;
3168 IF_DEBUG(linker,debugBelch( "Rel entry %3d is raw(%6p %6p)",
3169 j, (void*)offset, (void*)info ));
3171 IF_DEBUG(linker,debugBelch( " ZERO" ));
3174 Elf_Sym sym = stab[ELF_R_SYM(info)];
3175 /* First see if it is a local symbol. */
3176 if (ELF_ST_BIND(sym.st_info) == STB_LOCAL) {
3177 /* Yes, so we can get the address directly from the ELF symbol
3179 symbol = sym.st_name==0 ? "(noname)" : strtab+sym.st_name;
3181 (ehdrC + shdr[ sym.st_shndx ].sh_offset
3182 + stab[ELF_R_SYM(info)].st_value);
3185 symbol = strtab + sym.st_name;
3186 stablePtr = (StgStablePtr)lookupHashTable(stablehash, (StgWord)symbol);
3187 if (NULL == stablePtr) {
3188 /* No, so look up the name in our global table. */
3189 S_tmp = lookupSymbol( symbol );
3190 S = (Elf_Addr)S_tmp;
3192 stableVal = deRefStablePtr( stablePtr );
3194 S = (Elf_Addr)S_tmp;
3198 errorBelch("%s: unknown symbol `%s'", oc->fileName, symbol);
3201 IF_DEBUG(linker,debugBelch( "`%s' resolves to %p\n", symbol, (void*)S ));
3204 IF_DEBUG(linker,debugBelch( "Reloc: P = %p S = %p A = %p\n",
3205 (void*)P, (void*)S, (void*)A ));
3206 checkProddableBlock ( oc, pP );
3210 switch (ELF_R_TYPE(info)) {
3211 # ifdef i386_HOST_ARCH
3212 case R_386_32: *pP = value; break;
3213 case R_386_PC32: *pP = value - P; break;
3216 errorBelch("%s: unhandled ELF relocation(Rel) type %lu\n",
3217 oc->fileName, (lnat)ELF_R_TYPE(info));
3225 /* Do ELF relocations for which explicit addends are supplied.
3226 sparc-solaris relocations appear to be of this form. */
3228 do_Elf_Rela_relocations ( ObjectCode* oc, char* ehdrC,
3229 Elf_Shdr* shdr, int shnum,
3230 Elf_Sym* stab, char* strtab )
3233 char *symbol = NULL;
3235 Elf_Rela* rtab = (Elf_Rela*) (ehdrC + shdr[shnum].sh_offset);
3236 int nent = shdr[shnum].sh_size / sizeof(Elf_Rela);
3237 int target_shndx = shdr[shnum].sh_info;
3238 int symtab_shndx = shdr[shnum].sh_link;
3240 stab = (Elf_Sym*) (ehdrC + shdr[ symtab_shndx ].sh_offset);
3241 targ = (Elf_Addr) (ehdrC + shdr[ target_shndx ].sh_offset);
3242 IF_DEBUG(linker,debugBelch( "relocations for section %d using symtab %d\n",
3243 target_shndx, symtab_shndx ));
3245 for (j = 0; j < nent; j++) {
3246 #if defined(DEBUG) || defined(sparc_HOST_ARCH) || defined(ia64_HOST_ARCH) || defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH)
3247 /* This #ifdef only serves to avoid unused-var warnings. */
3248 Elf_Addr offset = rtab[j].r_offset;
3249 Elf_Addr P = targ + offset;
3251 Elf_Addr info = rtab[j].r_info;
3252 Elf_Addr A = rtab[j].r_addend;
3256 # if defined(sparc_HOST_ARCH)
3257 Elf_Word* pP = (Elf_Word*)P;
3259 # elif defined(ia64_HOST_ARCH)
3260 Elf64_Xword *pP = (Elf64_Xword *)P;
3262 # elif defined(powerpc_HOST_ARCH)
3266 IF_DEBUG(linker,debugBelch( "Rel entry %3d is raw(%6p %6p %6p) ",
3267 j, (void*)offset, (void*)info,
3270 IF_DEBUG(linker,debugBelch( " ZERO" ));
3273 Elf_Sym sym = stab[ELF_R_SYM(info)];
3274 /* First see if it is a local symbol. */
3275 if (ELF_ST_BIND(sym.st_info) == STB_LOCAL) {
3276 /* Yes, so we can get the address directly from the ELF symbol
3278 symbol = sym.st_name==0 ? "(noname)" : strtab+sym.st_name;
3280 (ehdrC + shdr[ sym.st_shndx ].sh_offset
3281 + stab[ELF_R_SYM(info)].st_value);
3282 #ifdef ELF_FUNCTION_DESC
3283 /* Make a function descriptor for this function */
3284 if (S && ELF_ST_TYPE(sym.st_info) == STT_FUNC) {
3285 S = allocateFunctionDesc(S + A);
3290 /* No, so look up the name in our global table. */
3291 symbol = strtab + sym.st_name;
3292 S_tmp = lookupSymbol( symbol );
3293 S = (Elf_Addr)S_tmp;
3295 #ifdef ELF_FUNCTION_DESC
3296 /* If a function, already a function descriptor - we would
3297 have to copy it to add an offset. */
3298 if (S && (ELF_ST_TYPE(sym.st_info) == STT_FUNC) && (A != 0))
3299 errorBelch("%s: function %s with addend %p", oc->fileName, symbol, (void *)A);
3303 errorBelch("%s: unknown symbol `%s'", oc->fileName, symbol);
3306 IF_DEBUG(linker,debugBelch( "`%s' resolves to %p", symbol, (void*)S ));
3309 IF_DEBUG(linker,debugBelch("Reloc: P = %p S = %p A = %p\n",
3310 (void*)P, (void*)S, (void*)A ));
3311 /* checkProddableBlock ( oc, (void*)P ); */
3315 switch (ELF_R_TYPE(info)) {
3316 # if defined(sparc_HOST_ARCH)
3317 case R_SPARC_WDISP30:
3318 w1 = *pP & 0xC0000000;
3319 w2 = (Elf_Word)((value - P) >> 2);
3320 ASSERT((w2 & 0xC0000000) == 0);
3325 w1 = *pP & 0xFFC00000;
3326 w2 = (Elf_Word)(value >> 10);
3327 ASSERT((w2 & 0xFFC00000) == 0);
3333 w2 = (Elf_Word)(value & 0x3FF);
3334 ASSERT((w2 & ~0x3FF) == 0);
3338 /* According to the Sun documentation:
3340 This relocation type resembles R_SPARC_32, except it refers to an
3341 unaligned word. That is, the word to be relocated must be treated
3342 as four separate bytes with arbitrary alignment, not as a word
3343 aligned according to the architecture requirements.
3345 (JRS: which means that freeloading on the R_SPARC_32 case
3346 is probably wrong, but hey ...)
3350 w2 = (Elf_Word)value;
3353 # elif defined(ia64_HOST_ARCH)
3354 case R_IA64_DIR64LSB:
3355 case R_IA64_FPTR64LSB:
3358 case R_IA64_PCREL64LSB:
3361 case R_IA64_SEGREL64LSB:
3362 addr = findElfSegment(ehdrC, value);
3365 case R_IA64_GPREL22:
3366 ia64_reloc_gprel22(P, value);
3368 case R_IA64_LTOFF22:
3369 case R_IA64_LTOFF22X:
3370 case R_IA64_LTOFF_FPTR22:
3371 addr = allocateGOTEntry(value);
3372 ia64_reloc_gprel22(P, addr);
3374 case R_IA64_PCREL21B:
3375 ia64_reloc_pcrel21(P, S, oc);
3378 /* This goes with R_IA64_LTOFF22X and points to the load to
3379 * convert into a move. We don't implement relaxation. */
3381 # elif defined(powerpc_HOST_ARCH)
3382 case R_PPC_ADDR16_LO:
3383 *(Elf32_Half*) P = value;
3386 case R_PPC_ADDR16_HI:
3387 *(Elf32_Half*) P = value >> 16;
3390 case R_PPC_ADDR16_HA:
3391 *(Elf32_Half*) P = (value + 0x8000) >> 16;
3395 *(Elf32_Word *) P = value;
3399 *(Elf32_Word *) P = value - P;
3405 if( delta << 6 >> 6 != delta )
3407 value = makeJumpIsland( oc, ELF_R_SYM(info), value );
3410 if( value == 0 || delta << 6 >> 6 != delta )
3412 barf( "Unable to make ppcJumpIsland for #%d",
3418 *(Elf_Word *) P = (*(Elf_Word *) P & 0xfc000003)
3419 | (delta & 0x3fffffc);
3423 #if x86_64_HOST_ARCH
3425 *(Elf64_Xword *)P = value;
3430 StgInt64 off = value - P;
3431 if (off >= 0x7fffffffL || off < -0x80000000L) {
3432 barf("R_X86_64_PC32 relocation out of range: %s = %p",
3435 *(Elf64_Word *)P = (Elf64_Word)off;
3440 if (value >= 0x7fffffffL) {
3441 barf("R_X86_64_32 relocation out of range: %s = %p\n",
3444 *(Elf64_Word *)P = (Elf64_Word)value;
3448 if ((StgInt64)value > 0x7fffffffL || (StgInt64)value < -0x80000000L) {
3449 barf("R_X86_64_32S relocation out of range: %s = %p\n",
3452 *(Elf64_Sword *)P = (Elf64_Sword)value;
3457 errorBelch("%s: unhandled ELF relocation(RelA) type %lu\n",
3458 oc->fileName, (lnat)ELF_R_TYPE(info));
3467 ocResolve_ELF ( ObjectCode* oc )
3471 Elf_Sym* stab = NULL;
3472 char* ehdrC = (char*)(oc->image);
3473 Elf_Ehdr* ehdr = (Elf_Ehdr*) ehdrC;
3474 Elf_Shdr* shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
3476 /* first find "the" symbol table */
3477 stab = (Elf_Sym*) findElfSection ( ehdrC, SHT_SYMTAB );
3479 /* also go find the string table */
3480 strtab = findElfSection ( ehdrC, SHT_STRTAB );
3482 if (stab == NULL || strtab == NULL) {
3483 errorBelch("%s: can't find string or symbol table", oc->fileName);
3487 /* Process the relocation sections. */
3488 for (shnum = 0; shnum < ehdr->e_shnum; shnum++) {
3489 if (shdr[shnum].sh_type == SHT_REL) {
3490 ok = do_Elf_Rel_relocations ( oc, ehdrC, shdr,
3491 shnum, stab, strtab );
3495 if (shdr[shnum].sh_type == SHT_RELA) {
3496 ok = do_Elf_Rela_relocations ( oc, ehdrC, shdr,
3497 shnum, stab, strtab );
3502 /* Free the local symbol table; we won't need it again. */
3503 freeHashTable(oc->lochash, NULL);
3506 #if defined(powerpc_HOST_ARCH)
3507 ocFlushInstructionCache( oc );
3515 * Instructions are 41 bits long, packed into 128 bit bundles with a 5-bit template
3516 * at the front. The following utility functions pack and unpack instructions, and
3517 * take care of the most common relocations.
3520 #ifdef ia64_HOST_ARCH
3523 ia64_extract_instruction(Elf64_Xword *target)
3526 int slot = (Elf_Addr)target & 3;
3527 target = (Elf_Addr)target & ~3;
3535 return ((w1 >> 5) & 0x1ffffffffff);
3537 return (w1 >> 46) | ((w2 & 0x7fffff) << 18);
3541 barf("ia64_extract_instruction: invalid slot %p", target);
3546 ia64_deposit_instruction(Elf64_Xword *target, Elf64_Xword value)
3548 int slot = (Elf_Addr)target & 3;
3549 target = (Elf_Addr)target & ~3;
3554 *target |= value << 5;
3557 *target |= value << 46;
3558 *(target+1) |= value >> 18;
3561 *(target+1) |= value << 23;
3567 ia64_reloc_gprel22(Elf_Addr target, Elf_Addr value)
3569 Elf64_Xword instruction;
3570 Elf64_Sxword rel_value;
3572 rel_value = value - gp_val;
3573 if ((rel_value > 0x1fffff) || (rel_value < -0x1fffff))
3574 barf("GP-relative data out of range (address = 0x%lx, gp = 0x%lx)", value, gp_val);
3576 instruction = ia64_extract_instruction((Elf64_Xword *)target);
3577 instruction |= (((rel_value >> 0) & 0x07f) << 13) /* imm7b */
3578 | (((rel_value >> 7) & 0x1ff) << 27) /* imm9d */
3579 | (((rel_value >> 16) & 0x01f) << 22) /* imm5c */
3580 | ((Elf64_Xword)(rel_value < 0) << 36); /* s */
3581 ia64_deposit_instruction((Elf64_Xword *)target, instruction);
3585 ia64_reloc_pcrel21(Elf_Addr target, Elf_Addr value, ObjectCode *oc)
3587 Elf64_Xword instruction;
3588 Elf64_Sxword rel_value;
3591 entry = allocatePLTEntry(value, oc);
3593 rel_value = (entry >> 4) - (target >> 4);
3594 if ((rel_value > 0xfffff) || (rel_value < -0xfffff))
3595 barf("PLT entry too far away (entry = 0x%lx, target = 0x%lx)", entry, target);
3597 instruction = ia64_extract_instruction((Elf64_Xword *)target);
3598 instruction |= ((rel_value & 0xfffff) << 13) /* imm20b */
3599 | ((Elf64_Xword)(rel_value < 0) << 36); /* s */
3600 ia64_deposit_instruction((Elf64_Xword *)target, instruction);
3606 * PowerPC ELF specifics
3609 #ifdef powerpc_HOST_ARCH
3611 static int ocAllocateJumpIslands_ELF( ObjectCode *oc )
3617 ehdr = (Elf_Ehdr *) oc->image;
3618 shdr = (Elf_Shdr *) ( ((char *)oc->image) + ehdr->e_shoff );
3620 for( i = 0; i < ehdr->e_shnum; i++ )
3621 if( shdr[i].sh_type == SHT_SYMTAB )
3624 if( i == ehdr->e_shnum )
3626 errorBelch( "This ELF file contains no symtab" );
3630 if( shdr[i].sh_entsize != sizeof( Elf_Sym ) )
3632 errorBelch( "The entry size (%d) of the symtab isn't %d\n",
3633 shdr[i].sh_entsize, sizeof( Elf_Sym ) );
3638 return ocAllocateJumpIslands( oc, shdr[i].sh_size / sizeof( Elf_Sym ), 0 );
3641 #endif /* powerpc */
3645 /* --------------------------------------------------------------------------
3647 * ------------------------------------------------------------------------*/
3649 #if defined(OBJFORMAT_MACHO)
3652 Support for MachO linking on Darwin/MacOS X
3653 by Wolfgang Thaller (wolfgang.thaller@gmx.net)
3655 I hereby formally apologize for the hackish nature of this code.
3656 Things that need to be done:
3657 *) implement ocVerifyImage_MachO
3658 *) add still more sanity checks.
3661 #ifdef powerpc_HOST_ARCH
3662 static int ocAllocateJumpIslands_MachO(ObjectCode* oc)
3664 struct mach_header *header = (struct mach_header *) oc->image;
3665 struct load_command *lc = (struct load_command *) (header + 1);
3668 for( i = 0; i < header->ncmds; i++ )
3670 if( lc->cmd == LC_SYMTAB )
3672 // Find out the first and last undefined external
3673 // symbol, so we don't have to allocate too many
3675 struct symtab_command *symLC = (struct symtab_command *) lc;
3676 unsigned min = symLC->nsyms, max = 0;
3677 struct nlist *nlist =
3678 symLC ? (struct nlist*) ((char*) oc->image + symLC->symoff)
3680 for(i=0;i<symLC->nsyms;i++)
3682 if(nlist[i].n_type & N_STAB)
3684 else if(nlist[i].n_type & N_EXT)
3686 if((nlist[i].n_type & N_TYPE) == N_UNDF
3687 && (nlist[i].n_value == 0))
3697 return ocAllocateJumpIslands(oc, max - min + 1, min);
3702 lc = (struct load_command *) ( ((char *)lc) + lc->cmdsize );
3704 return ocAllocateJumpIslands(oc,0,0);
3708 static int ocVerifyImage_MachO(ObjectCode* oc STG_UNUSED)
3710 // FIXME: do some verifying here
3714 static int resolveImports(
3717 struct symtab_command *symLC,
3718 struct section *sect, // ptr to lazy or non-lazy symbol pointer section
3719 unsigned long *indirectSyms,
3720 struct nlist *nlist)
3723 size_t itemSize = 4;
3726 int isJumpTable = 0;
3727 if(!strcmp(sect->sectname,"__jump_table"))
3731 ASSERT(sect->reserved2 == itemSize);
3735 for(i=0; i*itemSize < sect->size;i++)
3737 // according to otool, reserved1 contains the first index into the indirect symbol table
3738 struct nlist *symbol = &nlist[indirectSyms[sect->reserved1+i]];
3739 char *nm = image + symLC->stroff + symbol->n_un.n_strx;
3742 if((symbol->n_type & N_TYPE) == N_UNDF
3743 && (symbol->n_type & N_EXT) && (symbol->n_value != 0))
3744 addr = (void*) (symbol->n_value);
3745 else if((addr = lookupLocalSymbol(oc,nm)) != NULL)
3748 addr = lookupSymbol(nm);
3751 errorBelch("\n%s: unknown symbol `%s'", oc->fileName, nm);
3759 checkProddableBlock(oc,image + sect->offset + i*itemSize);
3760 *(image + sect->offset + i*itemSize) = 0xe9; // jmp
3761 *(unsigned*)(image + sect->offset + i*itemSize + 1)
3762 = (char*)addr - (image + sect->offset + i*itemSize + 5);
3767 checkProddableBlock(oc,((void**)(image + sect->offset)) + i);
3768 ((void**)(image + sect->offset))[i] = addr;
3775 static unsigned long relocateAddress(
3778 struct section* sections,
3779 unsigned long address)
3782 for(i = 0; i < nSections; i++)
3784 if(sections[i].addr <= address
3785 && address < sections[i].addr + sections[i].size)
3787 return (unsigned long)oc->image
3788 + sections[i].offset + address - sections[i].addr;
3791 barf("Invalid Mach-O file:"
3792 "Address out of bounds while relocating object file");
3796 static int relocateSection(
3799 struct symtab_command *symLC, struct nlist *nlist,
3800 int nSections, struct section* sections, struct section *sect)
3802 struct relocation_info *relocs;
3805 if(!strcmp(sect->sectname,"__la_symbol_ptr"))
3807 else if(!strcmp(sect->sectname,"__nl_symbol_ptr"))
3809 else if(!strcmp(sect->sectname,"__la_sym_ptr2"))
3811 else if(!strcmp(sect->sectname,"__la_sym_ptr3"))
3815 relocs = (struct relocation_info*) (image + sect->reloff);
3819 if(relocs[i].r_address & R_SCATTERED)
3821 struct scattered_relocation_info *scat =
3822 (struct scattered_relocation_info*) &relocs[i];
3826 if(scat->r_length == 2)
3828 unsigned long word = 0;
3829 unsigned long* wordPtr = (unsigned long*) (image + sect->offset + scat->r_address);
3830 checkProddableBlock(oc,wordPtr);
3832 // Note on relocation types:
3833 // i386 uses the GENERIC_RELOC_* types,
3834 // while ppc uses special PPC_RELOC_* types.
3835 // *_RELOC_VANILLA and *_RELOC_PAIR have the same value
3836 // in both cases, all others are different.
3837 // Therefore, we use GENERIC_RELOC_VANILLA
3838 // and GENERIC_RELOC_PAIR instead of the PPC variants,
3839 // and use #ifdefs for the other types.
3841 // Step 1: Figure out what the relocated value should be
3842 if(scat->r_type == GENERIC_RELOC_VANILLA)
3844 word = *wordPtr + (unsigned long) relocateAddress(
3851 #ifdef powerpc_HOST_ARCH
3852 else if(scat->r_type == PPC_RELOC_SECTDIFF
3853 || scat->r_type == PPC_RELOC_LO16_SECTDIFF
3854 || scat->r_type == PPC_RELOC_HI16_SECTDIFF
3855 || scat->r_type == PPC_RELOC_HA16_SECTDIFF)
3857 else if(scat->r_type == GENERIC_RELOC_SECTDIFF)
3860 struct scattered_relocation_info *pair =
3861 (struct scattered_relocation_info*) &relocs[i+1];
3863 if(!pair->r_scattered || pair->r_type != GENERIC_RELOC_PAIR)
3864 barf("Invalid Mach-O file: "
3865 "RELOC_*_SECTDIFF not followed by RELOC_PAIR");
3867 word = (unsigned long)
3868 (relocateAddress(oc, nSections, sections, scat->r_value)
3869 - relocateAddress(oc, nSections, sections, pair->r_value));
3872 #ifdef powerpc_HOST_ARCH
3873 else if(scat->r_type == PPC_RELOC_HI16
3874 || scat->r_type == PPC_RELOC_LO16
3875 || scat->r_type == PPC_RELOC_HA16
3876 || scat->r_type == PPC_RELOC_LO14)
3877 { // these are generated by label+offset things
3878 struct relocation_info *pair = &relocs[i+1];
3879 if((pair->r_address & R_SCATTERED) || pair->r_type != PPC_RELOC_PAIR)
3880 barf("Invalid Mach-O file: "
3881 "PPC_RELOC_* not followed by PPC_RELOC_PAIR");
3883 if(scat->r_type == PPC_RELOC_LO16)
3885 word = ((unsigned short*) wordPtr)[1];
3886 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
3888 else if(scat->r_type == PPC_RELOC_LO14)
3890 barf("Unsupported Relocation: PPC_RELOC_LO14");
3891 word = ((unsigned short*) wordPtr)[1] & 0xFFFC;
3892 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
3894 else if(scat->r_type == PPC_RELOC_HI16)
3896 word = ((unsigned short*) wordPtr)[1] << 16;
3897 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF);
3899 else if(scat->r_type == PPC_RELOC_HA16)
3901 word = ((unsigned short*) wordPtr)[1] << 16;
3902 word += ((short)relocs[i+1].r_address & (short)0xFFFF);
3906 word += (unsigned long) relocateAddress(oc, nSections, sections, scat->r_value)
3913 continue; // ignore the others
3915 #ifdef powerpc_HOST_ARCH
3916 if(scat->r_type == GENERIC_RELOC_VANILLA
3917 || scat->r_type == PPC_RELOC_SECTDIFF)
3919 if(scat->r_type == GENERIC_RELOC_VANILLA
3920 || scat->r_type == GENERIC_RELOC_SECTDIFF)
3925 #ifdef powerpc_HOST_ARCH
3926 else if(scat->r_type == PPC_RELOC_LO16_SECTDIFF || scat->r_type == PPC_RELOC_LO16)
3928 ((unsigned short*) wordPtr)[1] = word & 0xFFFF;
3930 else if(scat->r_type == PPC_RELOC_HI16_SECTDIFF || scat->r_type == PPC_RELOC_HI16)
3932 ((unsigned short*) wordPtr)[1] = (word >> 16) & 0xFFFF;
3934 else if(scat->r_type == PPC_RELOC_HA16_SECTDIFF || scat->r_type == PPC_RELOC_HA16)
3936 ((unsigned short*) wordPtr)[1] = ((word >> 16) & 0xFFFF)
3937 + ((word & (1<<15)) ? 1 : 0);
3943 continue; // FIXME: I hope it's OK to ignore all the others.
3947 struct relocation_info *reloc = &relocs[i];
3948 if(reloc->r_pcrel && !reloc->r_extern)
3951 if(reloc->r_length == 2)
3953 unsigned long word = 0;
3954 #ifdef powerpc_HOST_ARCH
3955 unsigned long jumpIsland = 0;
3956 long offsetToJumpIsland = 0xBADBAD42; // initialise to bad value
3957 // to avoid warning and to catch
3961 unsigned long* wordPtr = (unsigned long*) (image + sect->offset + reloc->r_address);
3962 checkProddableBlock(oc,wordPtr);
3964 if(reloc->r_type == GENERIC_RELOC_VANILLA)
3968 #ifdef powerpc_HOST_ARCH
3969 else if(reloc->r_type == PPC_RELOC_LO16)
3971 word = ((unsigned short*) wordPtr)[1];
3972 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
3974 else if(reloc->r_type == PPC_RELOC_HI16)
3976 word = ((unsigned short*) wordPtr)[1] << 16;
3977 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF);
3979 else if(reloc->r_type == PPC_RELOC_HA16)
3981 word = ((unsigned short*) wordPtr)[1] << 16;
3982 word += ((short)relocs[i+1].r_address & (short)0xFFFF);
3984 else if(reloc->r_type == PPC_RELOC_BR24)
3987 word = (word & 0x03FFFFFC) | ((word & 0x02000000) ? 0xFC000000 : 0);
3991 if(!reloc->r_extern)
3994 sections[reloc->r_symbolnum-1].offset
3995 - sections[reloc->r_symbolnum-1].addr
4002 struct nlist *symbol = &nlist[reloc->r_symbolnum];
4003 char *nm = image + symLC->stroff + symbol->n_un.n_strx;
4004 void *symbolAddress = lookupSymbol(nm);
4007 errorBelch("\nunknown symbol `%s'", nm);
4013 #ifdef powerpc_HOST_ARCH
4014 // In the .o file, this should be a relative jump to NULL
4015 // and we'll change it to a relative jump to the symbol
4016 ASSERT(-word == reloc->r_address);
4017 jumpIsland = makeJumpIsland(oc,reloc->r_symbolnum,(unsigned long) symbolAddress);
4020 offsetToJumpIsland = word + jumpIsland
4021 - (((long)image) + sect->offset - sect->addr);
4024 word += (unsigned long) symbolAddress
4025 - (((long)image) + sect->offset - sect->addr);
4029 word += (unsigned long) symbolAddress;
4033 if(reloc->r_type == GENERIC_RELOC_VANILLA)
4038 #ifdef powerpc_HOST_ARCH
4039 else if(reloc->r_type == PPC_RELOC_LO16)
4041 ((unsigned short*) wordPtr)[1] = word & 0xFFFF;
4044 else if(reloc->r_type == PPC_RELOC_HI16)
4046 ((unsigned short*) wordPtr)[1] = (word >> 16) & 0xFFFF;
4049 else if(reloc->r_type == PPC_RELOC_HA16)
4051 ((unsigned short*) wordPtr)[1] = ((word >> 16) & 0xFFFF)
4052 + ((word & (1<<15)) ? 1 : 0);
4055 else if(reloc->r_type == PPC_RELOC_BR24)
4057 if((long)word > (long)0x01FFFFFF || (long)word < (long)0xFFE00000)
4059 // The branch offset is too large.
4060 // Therefore, we try to use a jump island.
4063 barf("unconditional relative branch out of range: "
4064 "no jump island available");
4067 word = offsetToJumpIsland;
4068 if((long)word > (long)0x01FFFFFF || (long)word < (long)0xFFE00000)
4069 barf("unconditional relative branch out of range: "
4070 "jump island out of range");
4072 *wordPtr = (*wordPtr & 0xFC000003) | (word & 0x03FFFFFC);
4077 barf("\nunknown relocation %d",reloc->r_type);
4084 static int ocGetNames_MachO(ObjectCode* oc)
4086 char *image = (char*) oc->image;
4087 struct mach_header *header = (struct mach_header*) image;
4088 struct load_command *lc = (struct load_command*) (image + sizeof(struct mach_header));
4089 unsigned i,curSymbol = 0;
4090 struct segment_command *segLC = NULL;
4091 struct section *sections;
4092 struct symtab_command *symLC = NULL;
4093 struct nlist *nlist;
4094 unsigned long commonSize = 0;
4095 char *commonStorage = NULL;
4096 unsigned long commonCounter;
4098 for(i=0;i<header->ncmds;i++)
4100 if(lc->cmd == LC_SEGMENT)
4101 segLC = (struct segment_command*) lc;
4102 else if(lc->cmd == LC_SYMTAB)
4103 symLC = (struct symtab_command*) lc;
4104 lc = (struct load_command *) ( ((char*)lc) + lc->cmdsize );
4107 sections = (struct section*) (segLC+1);
4108 nlist = symLC ? (struct nlist*) (image + symLC->symoff)
4111 for(i=0;i<segLC->nsects;i++)
4113 if(sections[i].size == 0)
4116 if((sections[i].flags & SECTION_TYPE) == S_ZEROFILL)
4118 char * zeroFillArea = stgCallocBytes(1,sections[i].size,
4119 "ocGetNames_MachO(common symbols)");
4120 sections[i].offset = zeroFillArea - image;
4123 if(!strcmp(sections[i].sectname,"__text"))
4124 addSection(oc, SECTIONKIND_CODE_OR_RODATA,
4125 (void*) (image + sections[i].offset),
4126 (void*) (image + sections[i].offset + sections[i].size));
4127 else if(!strcmp(sections[i].sectname,"__const"))
4128 addSection(oc, SECTIONKIND_RWDATA,
4129 (void*) (image + sections[i].offset),
4130 (void*) (image + sections[i].offset + sections[i].size));
4131 else if(!strcmp(sections[i].sectname,"__data"))
4132 addSection(oc, SECTIONKIND_RWDATA,
4133 (void*) (image + sections[i].offset),
4134 (void*) (image + sections[i].offset + sections[i].size));
4135 else if(!strcmp(sections[i].sectname,"__bss")
4136 || !strcmp(sections[i].sectname,"__common"))
4137 addSection(oc, SECTIONKIND_RWDATA,
4138 (void*) (image + sections[i].offset),
4139 (void*) (image + sections[i].offset + sections[i].size));
4141 addProddableBlock(oc, (void*) (image + sections[i].offset),
4145 // count external symbols defined here
4149 for(i=0;i<symLC->nsyms;i++)
4151 if(nlist[i].n_type & N_STAB)
4153 else if(nlist[i].n_type & N_EXT)
4155 if((nlist[i].n_type & N_TYPE) == N_UNDF
4156 && (nlist[i].n_value != 0))
4158 commonSize += nlist[i].n_value;
4161 else if((nlist[i].n_type & N_TYPE) == N_SECT)
4166 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
4167 "ocGetNames_MachO(oc->symbols)");
4171 for(i=0;i<symLC->nsyms;i++)
4173 if(nlist[i].n_type & N_STAB)
4175 else if((nlist[i].n_type & N_TYPE) == N_SECT)
4177 if(nlist[i].n_type & N_EXT)
4179 char *nm = image + symLC->stroff + nlist[i].n_un.n_strx;
4180 ghciInsertStrHashTable(oc->fileName, symhash, nm,
4182 + sections[nlist[i].n_sect-1].offset
4183 - sections[nlist[i].n_sect-1].addr
4184 + nlist[i].n_value);
4185 oc->symbols[curSymbol++] = nm;
4189 char *nm = image + symLC->stroff + nlist[i].n_un.n_strx;
4190 ghciInsertStrHashTable(oc->fileName, oc->lochash, nm,
4192 + sections[nlist[i].n_sect-1].offset
4193 - sections[nlist[i].n_sect-1].addr
4194 + nlist[i].n_value);
4200 commonStorage = stgCallocBytes(1,commonSize,"ocGetNames_MachO(common symbols)");
4201 commonCounter = (unsigned long)commonStorage;
4204 for(i=0;i<symLC->nsyms;i++)
4206 if((nlist[i].n_type & N_TYPE) == N_UNDF
4207 && (nlist[i].n_type & N_EXT) && (nlist[i].n_value != 0))
4209 char *nm = image + symLC->stroff + nlist[i].n_un.n_strx;
4210 unsigned long sz = nlist[i].n_value;
4212 nlist[i].n_value = commonCounter;
4214 ghciInsertStrHashTable(oc->fileName, symhash, nm,
4215 (void*)commonCounter);
4216 oc->symbols[curSymbol++] = nm;
4218 commonCounter += sz;
4225 static int ocResolve_MachO(ObjectCode* oc)
4227 char *image = (char*) oc->image;
4228 struct mach_header *header = (struct mach_header*) image;
4229 struct load_command *lc = (struct load_command*) (image + sizeof(struct mach_header));
4231 struct segment_command *segLC = NULL;
4232 struct section *sections;
4233 struct symtab_command *symLC = NULL;
4234 struct dysymtab_command *dsymLC = NULL;
4235 struct nlist *nlist;
4237 for(i=0;i<header->ncmds;i++)
4239 if(lc->cmd == LC_SEGMENT)
4240 segLC = (struct segment_command*) lc;
4241 else if(lc->cmd == LC_SYMTAB)
4242 symLC = (struct symtab_command*) lc;
4243 else if(lc->cmd == LC_DYSYMTAB)
4244 dsymLC = (struct dysymtab_command*) lc;
4245 lc = (struct load_command *) ( ((char*)lc) + lc->cmdsize );
4248 sections = (struct section*) (segLC+1);
4249 nlist = symLC ? (struct nlist*) (image + symLC->symoff)
4254 unsigned long *indirectSyms
4255 = (unsigned long*) (image + dsymLC->indirectsymoff);
4257 for(i=0;i<segLC->nsects;i++)
4259 if( !strcmp(sections[i].sectname,"__la_symbol_ptr")
4260 || !strcmp(sections[i].sectname,"__la_sym_ptr2")
4261 || !strcmp(sections[i].sectname,"__la_sym_ptr3"))
4263 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4266 else if(!strcmp(sections[i].sectname,"__nl_symbol_ptr")
4267 || !strcmp(sections[i].sectname,"__pointers"))
4269 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4272 else if(!strcmp(sections[i].sectname,"__jump_table"))
4274 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4280 for(i=0;i<segLC->nsects;i++)
4282 if(!relocateSection(oc,image,symLC,nlist,segLC->nsects,sections,§ions[i]))
4286 /* Free the local symbol table; we won't need it again. */
4287 freeHashTable(oc->lochash, NULL);
4290 #if defined (powerpc_HOST_ARCH)
4291 ocFlushInstructionCache( oc );
4297 #ifdef powerpc_HOST_ARCH
4299 * The Mach-O object format uses leading underscores. But not everywhere.
4300 * There is a small number of runtime support functions defined in
4301 * libcc_dynamic.a whose name does not have a leading underscore.
4302 * As a consequence, we can't get their address from C code.
4303 * We have to use inline assembler just to take the address of a function.
4307 static void machoInitSymbolsWithoutUnderscore()
4309 extern void* symbolsWithoutUnderscore[];
4310 void **p = symbolsWithoutUnderscore;
4311 __asm__ volatile(".globl _symbolsWithoutUnderscore\n.data\n_symbolsWithoutUnderscore:");
4315 __asm__ volatile(".long " # x);
4317 RTS_MACHO_NOUNDERLINE_SYMBOLS
4319 __asm__ volatile(".text");
4323 ghciInsertStrHashTable("(GHCi built-in symbols)", symhash, #x, *p++);
4325 RTS_MACHO_NOUNDERLINE_SYMBOLS
4332 * Figure out by how much to shift the entire Mach-O file in memory
4333 * when loading so that its single segment ends up 16-byte-aligned
4335 static int machoGetMisalignment( FILE * f )
4337 struct mach_header header;
4340 fread(&header, sizeof(header), 1, f);
4343 if(header.magic != MH_MAGIC)
4346 misalignment = (header.sizeofcmds + sizeof(header))
4349 return misalignment ? (16 - misalignment) : 0;