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 \
401 SymX(sendIOManagerEvent) \
402 SymX(readIOManagerEvent) \
403 SymX(getIOManagerEvent) \
404 SymX(console_handler)
407 #ifdef TABLES_NEXT_TO_CODE
408 #define RTS_RET_SYMBOLS /* nothing */
410 #define RTS_RET_SYMBOLS \
411 SymX(stg_enter_ret) \
412 SymX(stg_gc_fun_ret) \
419 SymX(stg_ap_pv_ret) \
420 SymX(stg_ap_pp_ret) \
421 SymX(stg_ap_ppv_ret) \
422 SymX(stg_ap_ppp_ret) \
423 SymX(stg_ap_pppv_ret) \
424 SymX(stg_ap_pppp_ret) \
425 SymX(stg_ap_ppppp_ret) \
426 SymX(stg_ap_pppppp_ret)
429 #define RTS_SYMBOLS \
432 SymX(stg_enter_info) \
433 SymX(stg_gc_void_info) \
434 SymX(__stg_gc_enter_1) \
435 SymX(stg_gc_noregs) \
436 SymX(stg_gc_unpt_r1_info) \
437 SymX(stg_gc_unpt_r1) \
438 SymX(stg_gc_unbx_r1_info) \
439 SymX(stg_gc_unbx_r1) \
440 SymX(stg_gc_f1_info) \
442 SymX(stg_gc_d1_info) \
444 SymX(stg_gc_l1_info) \
447 SymX(stg_gc_fun_info) \
449 SymX(stg_gc_gen_info) \
450 SymX(stg_gc_gen_hp) \
452 SymX(stg_gen_yield) \
453 SymX(stg_yield_noregs) \
454 SymX(stg_yield_to_interpreter) \
455 SymX(stg_gen_block) \
456 SymX(stg_block_noregs) \
458 SymX(stg_block_takemvar) \
459 SymX(stg_block_putmvar) \
460 SymX(stg_seq_frame_info) \
462 SymX(MallocFailHook) \
464 SymX(OutOfHeapHook) \
465 SymX(StackOverflowHook) \
466 SymX(__encodeDouble) \
467 SymX(__encodeFloat) \
471 SymX(__gmpz_cmp_si) \
472 SymX(__gmpz_cmp_ui) \
473 SymX(__gmpz_get_si) \
474 SymX(__gmpz_get_ui) \
475 SymX(__int_encodeDouble) \
476 SymX(__int_encodeFloat) \
477 SymX(andIntegerzh_fast) \
478 SymX(atomicallyzh_fast) \
482 SymX(blockAsyncExceptionszh_fast) \
484 SymX(catchRetryzh_fast) \
485 SymX(catchSTMzh_fast) \
487 SymX(closure_flags) \
489 SymX(cmpIntegerzh_fast) \
490 SymX(cmpIntegerIntzh_fast) \
491 SymX(complementIntegerzh_fast) \
492 SymX(createAdjustor) \
493 SymX(decodeDoublezh_fast) \
494 SymX(decodeFloatzh_fast) \
497 SymX(deRefWeakzh_fast) \
498 SymX(deRefStablePtrzh_fast) \
499 SymX(dirty_MUT_VAR) \
500 SymX(divExactIntegerzh_fast) \
501 SymX(divModIntegerzh_fast) \
503 SymX(forkOnzh_fast) \
505 SymX(forkOS_createThread) \
506 SymX(freeHaskellFunctionPtr) \
507 SymX(freeStablePtr) \
508 SymX(getOrSetTypeableStore) \
509 SymX(gcdIntegerzh_fast) \
510 SymX(gcdIntegerIntzh_fast) \
511 SymX(gcdIntzh_fast) \
520 SymX(hs_perform_gc) \
521 SymX(hs_free_stable_ptr) \
522 SymX(hs_free_fun_ptr) \
524 SymX(int2Integerzh_fast) \
525 SymX(integer2Intzh_fast) \
526 SymX(integer2Wordzh_fast) \
527 SymX(isCurrentThreadBoundzh_fast) \
528 SymX(isDoubleDenormalized) \
529 SymX(isDoubleInfinite) \
531 SymX(isDoubleNegativeZero) \
532 SymX(isEmptyMVarzh_fast) \
533 SymX(isFloatDenormalized) \
534 SymX(isFloatInfinite) \
536 SymX(isFloatNegativeZero) \
537 SymX(killThreadzh_fast) \
539 SymX(insertStableSymbol) \
542 SymX(makeStablePtrzh_fast) \
543 SymX(minusIntegerzh_fast) \
544 SymX(mkApUpd0zh_fast) \
545 SymX(myThreadIdzh_fast) \
546 SymX(labelThreadzh_fast) \
547 SymX(newArrayzh_fast) \
548 SymX(newBCOzh_fast) \
549 SymX(newByteArrayzh_fast) \
550 SymX_redirect(newCAF, newDynCAF) \
551 SymX(newMVarzh_fast) \
552 SymX(newMutVarzh_fast) \
553 SymX(newTVarzh_fast) \
554 SymX(atomicModifyMutVarzh_fast) \
555 SymX(newPinnedByteArrayzh_fast) \
557 SymX(orIntegerzh_fast) \
559 SymX(performMajorGC) \
560 SymX(plusIntegerzh_fast) \
563 SymX(putMVarzh_fast) \
564 SymX(quotIntegerzh_fast) \
565 SymX(quotRemIntegerzh_fast) \
567 SymX(raiseIOzh_fast) \
568 SymX(readTVarzh_fast) \
569 SymX(remIntegerzh_fast) \
570 SymX(resetNonBlockingFd) \
575 SymX(rts_checkSchedStatus) \
578 SymX(rts_evalLazyIO) \
579 SymX(rts_evalStableIO) \
583 SymX(rts_getDouble) \
588 SymX(rts_getFunPtr) \
589 SymX(rts_getStablePtr) \
590 SymX(rts_getThreadId) \
592 SymX(rts_getWord32) \
605 SymX(rts_mkStablePtr) \
613 SymX(rtsSupportsBoundThreads) \
614 SymX(__hscore_get_saved_termios) \
615 SymX(__hscore_set_saved_termios) \
617 SymX(startupHaskell) \
618 SymX(shutdownHaskell) \
619 SymX(shutdownHaskellAndExit) \
620 SymX(stable_ptr_table) \
621 SymX(stackOverflow) \
622 SymX(stg_CAF_BLACKHOLE_info) \
623 SymX(awakenBlockedQueue) \
624 SymX(stg_CHARLIKE_closure) \
625 SymX(stg_EMPTY_MVAR_info) \
626 SymX(stg_IND_STATIC_info) \
627 SymX(stg_INTLIKE_closure) \
628 SymX(stg_MUT_ARR_PTRS_DIRTY_info) \
629 SymX(stg_MUT_ARR_PTRS_FROZEN_info) \
630 SymX(stg_MUT_ARR_PTRS_FROZEN0_info) \
631 SymX(stg_WEAK_info) \
632 SymX(stg_ap_v_info) \
633 SymX(stg_ap_f_info) \
634 SymX(stg_ap_d_info) \
635 SymX(stg_ap_l_info) \
636 SymX(stg_ap_n_info) \
637 SymX(stg_ap_p_info) \
638 SymX(stg_ap_pv_info) \
639 SymX(stg_ap_pp_info) \
640 SymX(stg_ap_ppv_info) \
641 SymX(stg_ap_ppp_info) \
642 SymX(stg_ap_pppv_info) \
643 SymX(stg_ap_pppp_info) \
644 SymX(stg_ap_ppppp_info) \
645 SymX(stg_ap_pppppp_info) \
646 SymX(stg_ap_0_fast) \
647 SymX(stg_ap_v_fast) \
648 SymX(stg_ap_f_fast) \
649 SymX(stg_ap_d_fast) \
650 SymX(stg_ap_l_fast) \
651 SymX(stg_ap_n_fast) \
652 SymX(stg_ap_p_fast) \
653 SymX(stg_ap_pv_fast) \
654 SymX(stg_ap_pp_fast) \
655 SymX(stg_ap_ppv_fast) \
656 SymX(stg_ap_ppp_fast) \
657 SymX(stg_ap_pppv_fast) \
658 SymX(stg_ap_pppp_fast) \
659 SymX(stg_ap_ppppp_fast) \
660 SymX(stg_ap_pppppp_fast) \
661 SymX(stg_ap_1_upd_info) \
662 SymX(stg_ap_2_upd_info) \
663 SymX(stg_ap_3_upd_info) \
664 SymX(stg_ap_4_upd_info) \
665 SymX(stg_ap_5_upd_info) \
666 SymX(stg_ap_6_upd_info) \
667 SymX(stg_ap_7_upd_info) \
669 SymX(stg_sel_0_upd_info) \
670 SymX(stg_sel_10_upd_info) \
671 SymX(stg_sel_11_upd_info) \
672 SymX(stg_sel_12_upd_info) \
673 SymX(stg_sel_13_upd_info) \
674 SymX(stg_sel_14_upd_info) \
675 SymX(stg_sel_15_upd_info) \
676 SymX(stg_sel_1_upd_info) \
677 SymX(stg_sel_2_upd_info) \
678 SymX(stg_sel_3_upd_info) \
679 SymX(stg_sel_4_upd_info) \
680 SymX(stg_sel_5_upd_info) \
681 SymX(stg_sel_6_upd_info) \
682 SymX(stg_sel_7_upd_info) \
683 SymX(stg_sel_8_upd_info) \
684 SymX(stg_sel_9_upd_info) \
685 SymX(stg_upd_frame_info) \
686 SymX(suspendThread) \
687 SymX(takeMVarzh_fast) \
688 SymX(timesIntegerzh_fast) \
689 SymX(tryPutMVarzh_fast) \
690 SymX(tryTakeMVarzh_fast) \
691 SymX(unblockAsyncExceptionszh_fast) \
693 SymX(unsafeThawArrayzh_fast) \
694 SymX(waitReadzh_fast) \
695 SymX(waitWritezh_fast) \
696 SymX(word2Integerzh_fast) \
697 SymX(writeTVarzh_fast) \
698 SymX(xorIntegerzh_fast) \
700 SymX(stg_interp_constr_entry) \
701 SymX(stg_interp_constr1_entry) \
702 SymX(stg_interp_constr2_entry) \
703 SymX(stg_interp_constr3_entry) \
704 SymX(stg_interp_constr4_entry) \
705 SymX(stg_interp_constr5_entry) \
706 SymX(stg_interp_constr6_entry) \
707 SymX(stg_interp_constr7_entry) \
708 SymX(stg_interp_constr8_entry) \
711 SymX(getAllocations) \
714 RTS_USER_SIGNALS_SYMBOLS
716 #ifdef SUPPORT_LONG_LONGS
717 #define RTS_LONG_LONG_SYMS \
718 SymX(int64ToIntegerzh_fast) \
719 SymX(word64ToIntegerzh_fast)
721 #define RTS_LONG_LONG_SYMS /* nothing */
724 // 64-bit support functions in libgcc.a
725 #if defined(__GNUC__) && SIZEOF_VOID_P <= 4
726 #define RTS_LIBGCC_SYMBOLS \
736 #elif defined(ia64_HOST_ARCH)
737 #define RTS_LIBGCC_SYMBOLS \
745 #define RTS_LIBGCC_SYMBOLS
748 #if defined(darwin_HOST_OS) && defined(powerpc_HOST_ARCH)
749 // Symbols that don't have a leading underscore
750 // on Mac OS X. They have to receive special treatment,
751 // see machoInitSymbolsWithoutUnderscore()
752 #define RTS_MACHO_NOUNDERLINE_SYMBOLS \
757 /* entirely bogus claims about types of these symbols */
758 #define Sym(vvv) extern void vvv(void);
759 #define SymX(vvv) /**/
760 #define SymX_redirect(vvv,xxx) /**/
764 RTS_POSIX_ONLY_SYMBOLS
765 RTS_MINGW_ONLY_SYMBOLS
766 RTS_CYGWIN_ONLY_SYMBOLS
767 RTS_DARWIN_ONLY_SYMBOLS
773 #ifdef LEADING_UNDERSCORE
774 #define MAYBE_LEADING_UNDERSCORE_STR(s) ("_" s)
776 #define MAYBE_LEADING_UNDERSCORE_STR(s) (s)
779 #define Sym(vvv) { MAYBE_LEADING_UNDERSCORE_STR(#vvv), \
781 #define SymX(vvv) Sym(vvv)
783 // SymX_redirect allows us to redirect references to one symbol to
784 // another symbol. See newCAF/newDynCAF for an example.
785 #define SymX_redirect(vvv,xxx) \
786 { MAYBE_LEADING_UNDERSCORE_STR(#vvv), \
789 static RtsSymbolVal rtsSyms[] = {
793 RTS_POSIX_ONLY_SYMBOLS
794 RTS_MINGW_ONLY_SYMBOLS
795 RTS_CYGWIN_ONLY_SYMBOLS
796 RTS_DARWIN_ONLY_SYMBOLS
798 #if defined(darwin_HOST_OS) && defined(i386_HOST_ARCH)
799 // dyld stub code contains references to this,
800 // but it should never be called because we treat
801 // lazy pointers as nonlazy.
802 { "dyld_stub_binding_helper", (void*)0xDEADBEEF },
804 { 0, 0 } /* sentinel */
810 /* -----------------------------------------------------------------------------
811 * Insert symbols into hash tables, checking for duplicates.
813 static void ghciInsertStrHashTable ( char* obj_name,
819 if (lookupHashTable(table, (StgWord)key) == NULL)
821 insertStrHashTable(table, (StgWord)key, data);
826 "GHCi runtime linker: fatal error: I found a duplicate definition for symbol\n"
828 "whilst processing object file\n"
830 "This could be caused by:\n"
831 " * Loading two different object files which export the same symbol\n"
832 " * Specifying the same object file twice on the GHCi command line\n"
833 " * An incorrect `package.conf' entry, causing some object to be\n"
835 "GHCi cannot safely continue in this situation. Exiting now. Sorry.\n"
844 /* -----------------------------------------------------------------------------
845 * initialize the object linker
849 static int linker_init_done = 0 ;
851 #if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
852 static void *dl_prog_handle;
860 /* Make initLinker idempotent, so we can call it
861 before evey relevant operation; that means we
862 don't need to initialise the linker separately */
863 if (linker_init_done == 1) { return; } else {
864 linker_init_done = 1;
867 stablehash = allocStrHashTable();
868 symhash = allocStrHashTable();
870 /* populate the symbol table with stuff from the RTS */
871 for (sym = rtsSyms; sym->lbl != NULL; sym++) {
872 ghciInsertStrHashTable("(GHCi built-in symbols)",
873 symhash, sym->lbl, sym->addr);
875 # if defined(OBJFORMAT_MACHO) && defined(powerpc_HOST_ARCH)
876 machoInitSymbolsWithoutUnderscore();
879 # if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
880 # if defined(RTLD_DEFAULT)
881 dl_prog_handle = RTLD_DEFAULT;
883 dl_prog_handle = dlopen(NULL, RTLD_LAZY);
884 # endif /* RTLD_DEFAULT */
888 /* -----------------------------------------------------------------------------
889 * Loading DLL or .so dynamic libraries
890 * -----------------------------------------------------------------------------
892 * Add a DLL from which symbols may be found. In the ELF case, just
893 * do RTLD_GLOBAL-style add, so no further messing around needs to
894 * happen in order that symbols in the loaded .so are findable --
895 * lookupSymbol() will subsequently see them by dlsym on the program's
896 * dl-handle. Returns NULL if success, otherwise ptr to an err msg.
898 * In the PEi386 case, open the DLLs and put handles to them in a
899 * linked list. When looking for a symbol, try all handles in the
900 * list. This means that we need to load even DLLs that are guaranteed
901 * to be in the ghc.exe image already, just so we can get a handle
902 * to give to loadSymbol, so that we can find the symbols. For such
903 * libraries, the LoadLibrary call should be a no-op except for returning
908 #if defined(OBJFORMAT_PEi386)
909 /* A record for storing handles into DLLs. */
914 struct _OpenedDLL* next;
919 /* A list thereof. */
920 static OpenedDLL* opened_dlls = NULL;
924 addDLL( char *dll_name )
926 # if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
927 /* ------------------- ELF DLL loader ------------------- */
933 hdl= dlopen(dll_name, RTLD_NOW | RTLD_GLOBAL);
936 /* dlopen failed; return a ptr to the error msg. */
938 if (errmsg == NULL) errmsg = "addDLL: unknown error";
945 # elif defined(OBJFORMAT_PEi386)
946 /* ------------------- Win32 DLL loader ------------------- */
954 /* debugBelch("\naddDLL; dll_name = `%s'\n", dll_name); */
956 /* See if we've already got it, and ignore if so. */
957 for (o_dll = opened_dlls; o_dll != NULL; o_dll = o_dll->next) {
958 if (0 == strcmp(o_dll->name, dll_name))
962 /* The file name has no suffix (yet) so that we can try
963 both foo.dll and foo.drv
965 The documentation for LoadLibrary says:
966 If no file name extension is specified in the lpFileName
967 parameter, the default library extension .dll is
968 appended. However, the file name string can include a trailing
969 point character (.) to indicate that the module name has no
972 buf = stgMallocBytes(strlen(dll_name) + 10, "addDLL");
973 sprintf(buf, "%s.DLL", dll_name);
974 instance = LoadLibrary(buf);
975 if (instance == NULL) {
976 sprintf(buf, "%s.DRV", dll_name); // KAA: allow loading of drivers (like winspool.drv)
977 instance = LoadLibrary(buf);
978 if (instance == NULL) {
981 /* LoadLibrary failed; return a ptr to the error msg. */
982 return "addDLL: unknown error";
987 /* Add this DLL to the list of DLLs in which to search for symbols. */
988 o_dll = stgMallocBytes( sizeof(OpenedDLL), "addDLL" );
989 o_dll->name = stgMallocBytes(1+strlen(dll_name), "addDLL");
990 strcpy(o_dll->name, dll_name);
991 o_dll->instance = instance;
992 o_dll->next = opened_dlls;
997 barf("addDLL: not implemented on this platform");
1001 /* -----------------------------------------------------------------------------
1002 * insert a stable symbol in the hash table
1006 insertStableSymbol(char* obj_name, char* key, StgPtr p)
1008 ghciInsertStrHashTable(obj_name, stablehash, key, getStablePtr(p));
1012 /* -----------------------------------------------------------------------------
1013 * insert a symbol in the hash table
1016 insertSymbol(char* obj_name, char* key, void* data)
1018 ghciInsertStrHashTable(obj_name, symhash, key, data);
1021 /* -----------------------------------------------------------------------------
1022 * lookup a symbol in the hash table
1025 lookupSymbol( char *lbl )
1029 ASSERT(symhash != NULL);
1030 val = lookupStrHashTable(symhash, lbl);
1033 # if defined(OBJFORMAT_ELF)
1034 # if defined(x86_64_HOST_ARCH)
1035 val = dlsym(dl_prog_handle, lbl);
1036 if (val >= (void *)0x80000000) {
1038 new_val = x86_64_high_symbol(lbl, val);
1039 IF_DEBUG(linker,debugBelch("lookupSymbol: relocating out of range symbol: %s = %p, now %p\n", lbl, val, new_val));
1045 return dlsym(dl_prog_handle, lbl);
1047 # elif defined(OBJFORMAT_MACHO)
1048 if(NSIsSymbolNameDefined(lbl)) {
1049 NSSymbol symbol = NSLookupAndBindSymbol(lbl);
1050 return NSAddressOfSymbol(symbol);
1054 # elif defined(OBJFORMAT_PEi386)
1057 for (o_dll = opened_dlls; o_dll != NULL; o_dll = o_dll->next) {
1058 /* debugBelch("look in %s for %s\n", o_dll->name, lbl); */
1059 if (lbl[0] == '_') {
1060 /* HACK: if the name has an initial underscore, try stripping
1061 it off & look that up first. I've yet to verify whether there's
1062 a Rule that governs whether an initial '_' *should always* be
1063 stripped off when mapping from import lib name to the DLL name.
1065 sym = GetProcAddress(o_dll->instance, (lbl+1));
1067 /*debugBelch("found %s in %s\n", lbl+1,o_dll->name);*/
1071 sym = GetProcAddress(o_dll->instance, lbl);
1073 /*debugBelch("found %s in %s\n", lbl,o_dll->name);*/
1088 __attribute((unused))
1090 lookupLocalSymbol( ObjectCode* oc, char *lbl )
1094 val = lookupStrHashTable(oc->lochash, lbl);
1104 /* -----------------------------------------------------------------------------
1105 * Debugging aid: look in GHCi's object symbol tables for symbols
1106 * within DELTA bytes of the specified address, and show their names.
1109 void ghci_enquire ( char* addr );
1111 void ghci_enquire ( char* addr )
1116 const int DELTA = 64;
1121 for (oc = objects; oc; oc = oc->next) {
1122 for (i = 0; i < oc->n_symbols; i++) {
1123 sym = oc->symbols[i];
1124 if (sym == NULL) continue;
1125 // debugBelch("enquire %p %p\n", sym, oc->lochash);
1127 if (oc->lochash != NULL) {
1128 a = lookupStrHashTable(oc->lochash, sym);
1131 a = lookupStrHashTable(symhash, sym);
1134 // debugBelch("ghci_enquire: can't find %s\n", sym);
1136 else if (addr-DELTA <= a && a <= addr+DELTA) {
1137 debugBelch("%p + %3d == `%s'\n", addr, (int)(a - addr), sym);
1144 #ifdef ia64_HOST_ARCH
1145 static unsigned int PLTSize(void);
1148 /* -----------------------------------------------------------------------------
1149 * Load an obj (populate the global symbol table, but don't resolve yet)
1151 * Returns: 1 if ok, 0 on error.
1154 loadObj( char *path )
1161 void *map_addr = NULL;
1168 /* debugBelch("loadObj %s\n", path ); */
1170 /* Check that we haven't already loaded this object.
1171 Ignore requests to load multiple times */
1175 for (o = objects; o; o = o->next) {
1176 if (0 == strcmp(o->fileName, path)) {
1178 break; /* don't need to search further */
1182 IF_DEBUG(linker, debugBelch(
1183 "GHCi runtime linker: warning: looks like you're trying to load the\n"
1184 "same object file twice:\n"
1186 "GHCi will ignore this, but be warned.\n"
1188 return 1; /* success */
1192 oc = stgMallocBytes(sizeof(ObjectCode), "loadObj(oc)");
1194 # if defined(OBJFORMAT_ELF)
1195 oc->formatName = "ELF";
1196 # elif defined(OBJFORMAT_PEi386)
1197 oc->formatName = "PEi386";
1198 # elif defined(OBJFORMAT_MACHO)
1199 oc->formatName = "Mach-O";
1202 barf("loadObj: not implemented on this platform");
1205 r = stat(path, &st);
1206 if (r == -1) { return 0; }
1208 /* sigh, strdup() isn't a POSIX function, so do it the long way */
1209 oc->fileName = stgMallocBytes( strlen(path)+1, "loadObj" );
1210 strcpy(oc->fileName, path);
1212 oc->fileSize = st.st_size;
1214 oc->sections = NULL;
1215 oc->lochash = allocStrHashTable();
1216 oc->proddables = NULL;
1218 /* chain it onto the list of objects */
1223 #define ROUND_UP(x,size) ((x + size - 1) & ~(size - 1))
1225 /* On many architectures malloc'd memory isn't executable, so we need to use mmap. */
1227 #if defined(openbsd_HOST_OS)
1228 fd = open(path, O_RDONLY, S_IRUSR);
1230 fd = open(path, O_RDONLY);
1233 barf("loadObj: can't open `%s'", path);
1235 pagesize = getpagesize();
1237 #ifdef ia64_HOST_ARCH
1238 /* The PLT needs to be right before the object */
1239 n = ROUND_UP(PLTSize(), pagesize);
1240 oc->plt = mmap(NULL, n, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
1241 if (oc->plt == MAP_FAILED)
1242 barf("loadObj: can't allocate PLT");
1245 map_addr = oc->plt + n;
1248 n = ROUND_UP(oc->fileSize, pagesize);
1250 /* Link objects into the lower 2Gb on x86_64. GHC assumes the
1251 * small memory model on this architecture (see gcc docs,
1254 #ifdef x86_64_HOST_ARCH
1255 #define EXTRA_MAP_FLAGS MAP_32BIT
1257 #define EXTRA_MAP_FLAGS 0
1260 oc->image = mmap(map_addr, n, PROT_EXEC|PROT_READ|PROT_WRITE,
1261 MAP_PRIVATE|EXTRA_MAP_FLAGS, fd, 0);
1262 if (oc->image == MAP_FAILED)
1263 barf("loadObj: can't map `%s'", path);
1267 #else /* !USE_MMAP */
1269 /* load the image into memory */
1270 f = fopen(path, "rb");
1272 barf("loadObj: can't read `%s'", path);
1274 #ifdef darwin_HOST_OS
1275 // In a Mach-O .o file, all sections can and will be misaligned
1276 // if the total size of the headers is not a multiple of the
1277 // desired alignment. This is fine for .o files that only serve
1278 // as input for the static linker, but it's not fine for us,
1279 // as SSE (used by gcc for floating point) and Altivec require
1280 // 16-byte alignment.
1281 // We calculate the correct alignment from the header before
1282 // reading the file, and then we misalign oc->image on purpose so
1283 // that the actual sections end up aligned again.
1284 misalignment = machoGetMisalignment(f);
1285 oc->misalignment = misalignment;
1290 oc->image = stgMallocBytes(oc->fileSize + misalignment, "loadObj(image)");
1291 oc->image += misalignment;
1293 n = fread ( oc->image, 1, oc->fileSize, f );
1294 if (n != oc->fileSize)
1295 barf("loadObj: error whilst reading `%s'", path);
1299 #endif /* USE_MMAP */
1301 # if defined(OBJFORMAT_MACHO) && defined(powerpc_HOST_ARCH)
1302 r = ocAllocateJumpIslands_MachO ( oc );
1303 if (!r) { return r; }
1304 # elif defined(OBJFORMAT_ELF) && defined(powerpc_HOST_ARCH)
1305 r = ocAllocateJumpIslands_ELF ( oc );
1306 if (!r) { return r; }
1309 /* verify the in-memory image */
1310 # if defined(OBJFORMAT_ELF)
1311 r = ocVerifyImage_ELF ( oc );
1312 # elif defined(OBJFORMAT_PEi386)
1313 r = ocVerifyImage_PEi386 ( oc );
1314 # elif defined(OBJFORMAT_MACHO)
1315 r = ocVerifyImage_MachO ( oc );
1317 barf("loadObj: no verify method");
1319 if (!r) { return r; }
1321 /* build the symbol list for this image */
1322 # if defined(OBJFORMAT_ELF)
1323 r = ocGetNames_ELF ( oc );
1324 # elif defined(OBJFORMAT_PEi386)
1325 r = ocGetNames_PEi386 ( oc );
1326 # elif defined(OBJFORMAT_MACHO)
1327 r = ocGetNames_MachO ( oc );
1329 barf("loadObj: no getNames method");
1331 if (!r) { return r; }
1333 /* loaded, but not resolved yet */
1334 oc->status = OBJECT_LOADED;
1339 /* -----------------------------------------------------------------------------
1340 * resolve all the currently unlinked objects in memory
1342 * Returns: 1 if ok, 0 on error.
1352 for (oc = objects; oc; oc = oc->next) {
1353 if (oc->status != OBJECT_RESOLVED) {
1354 # if defined(OBJFORMAT_ELF)
1355 r = ocResolve_ELF ( oc );
1356 # elif defined(OBJFORMAT_PEi386)
1357 r = ocResolve_PEi386 ( oc );
1358 # elif defined(OBJFORMAT_MACHO)
1359 r = ocResolve_MachO ( oc );
1361 barf("resolveObjs: not implemented on this platform");
1363 if (!r) { return r; }
1364 oc->status = OBJECT_RESOLVED;
1370 /* -----------------------------------------------------------------------------
1371 * delete an object from the pool
1374 unloadObj( char *path )
1376 ObjectCode *oc, *prev;
1378 ASSERT(symhash != NULL);
1379 ASSERT(objects != NULL);
1384 for (oc = objects; oc; prev = oc, oc = oc->next) {
1385 if (!strcmp(oc->fileName,path)) {
1387 /* Remove all the mappings for the symbols within this
1392 for (i = 0; i < oc->n_symbols; i++) {
1393 if (oc->symbols[i] != NULL) {
1394 removeStrHashTable(symhash, oc->symbols[i], NULL);
1402 prev->next = oc->next;
1405 /* We're going to leave this in place, in case there are
1406 any pointers from the heap into it: */
1407 /* stgFree(oc->image); */
1408 stgFree(oc->fileName);
1409 stgFree(oc->symbols);
1410 stgFree(oc->sections);
1411 /* The local hash table should have been freed at the end
1412 of the ocResolve_ call on it. */
1413 ASSERT(oc->lochash == NULL);
1419 errorBelch("unloadObj: can't find `%s' to unload", path);
1423 /* -----------------------------------------------------------------------------
1424 * Sanity checking. For each ObjectCode, maintain a list of address ranges
1425 * which may be prodded during relocation, and abort if we try and write
1426 * outside any of these.
1428 static void addProddableBlock ( ObjectCode* oc, void* start, int size )
1431 = stgMallocBytes(sizeof(ProddableBlock), "addProddableBlock");
1432 /* debugBelch("aPB %p %p %d\n", oc, start, size); */
1436 pb->next = oc->proddables;
1437 oc->proddables = pb;
1440 static void checkProddableBlock ( ObjectCode* oc, void* addr )
1443 for (pb = oc->proddables; pb != NULL; pb = pb->next) {
1444 char* s = (char*)(pb->start);
1445 char* e = s + pb->size - 1;
1446 char* a = (char*)addr;
1447 /* Assumes that the biggest fixup involves a 4-byte write. This
1448 probably needs to be changed to 8 (ie, +7) on 64-bit
1450 if (a >= s && (a+3) <= e) return;
1452 barf("checkProddableBlock: invalid fixup in runtime linker");
1455 /* -----------------------------------------------------------------------------
1456 * Section management.
1458 static void addSection ( ObjectCode* oc, SectionKind kind,
1459 void* start, void* end )
1461 Section* s = stgMallocBytes(sizeof(Section), "addSection");
1465 s->next = oc->sections;
1468 debugBelch("addSection: %p-%p (size %d), kind %d\n",
1469 start, ((char*)end)-1, end - start + 1, kind );
1474 /* --------------------------------------------------------------------------
1475 * PowerPC specifics (jump islands)
1476 * ------------------------------------------------------------------------*/
1478 #if defined(powerpc_HOST_ARCH)
1481 ocAllocateJumpIslands
1483 Allocate additional space at the end of the object file image to make room
1486 PowerPC relative branch instructions have a 24 bit displacement field.
1487 As PPC code is always 4-byte-aligned, this yields a +-32MB range.
1488 If a particular imported symbol is outside this range, we have to redirect
1489 the jump to a short piece of new code that just loads the 32bit absolute
1490 address and jumps there.
1491 This function just allocates space for one 16 byte ppcJumpIsland for every
1492 undefined symbol in the object file. The code for the islands is filled in by
1493 makeJumpIsland below.
1496 static int ocAllocateJumpIslands( ObjectCode* oc, int count, int first )
1502 int misalignment = 0;
1504 misalignment = oc->misalignment;
1509 // round up to the nearest 4
1510 aligned = (oc->fileSize + 3) & ~3;
1513 #ifndef linux_HOST_OS /* mremap is a linux extension */
1514 #error ocAllocateJumpIslands doesnt want USE_MMAP to be defined
1517 pagesize = getpagesize();
1518 n = ROUND_UP( oc->fileSize, pagesize );
1519 m = ROUND_UP( aligned + sizeof (ppcJumpIsland) * count, pagesize );
1521 /* If we have a half-page-size file and map one page of it then
1522 * the part of the page after the size of the file remains accessible.
1523 * If, however, we map in 2 pages, the 2nd page is not accessible
1524 * and will give a "Bus Error" on access. To get around this, we check
1525 * if we need any extra pages for the jump islands and map them in
1526 * anonymously. We must check that we actually require extra pages
1527 * otherwise the attempt to mmap 0 pages of anonymous memory will
1533 /* The effect of this mremap() call is only the ensure that we have
1534 * a sufficient number of virtually contiguous pages. As returned from
1535 * mremap, the pages past the end of the file are not backed. We give
1536 * them a backing by using MAP_FIXED to map in anonymous pages.
1538 oc->image = mremap( oc->image, n, m, MREMAP_MAYMOVE );
1540 if( oc->image == MAP_FAILED )
1542 errorBelch( "Unable to mremap for Jump Islands\n" );
1546 if( mmap( oc->image + n, m - n, PROT_READ | PROT_WRITE | PROT_EXEC,
1547 MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED, 0, 0 ) == MAP_FAILED )
1549 errorBelch( "Unable to mmap( MAP_FIXED ) for Jump Islands\n" );
1555 oc->image -= misalignment;
1556 oc->image = stgReallocBytes( oc->image,
1558 aligned + sizeof (ppcJumpIsland) * count,
1559 "ocAllocateJumpIslands" );
1560 oc->image += misalignment;
1561 #endif /* USE_MMAP */
1563 oc->jump_islands = (ppcJumpIsland *) (oc->image + aligned);
1564 memset( oc->jump_islands, 0, sizeof (ppcJumpIsland) * count );
1567 oc->jump_islands = NULL;
1569 oc->island_start_symbol = first;
1570 oc->n_islands = count;
1575 static unsigned long makeJumpIsland( ObjectCode* oc,
1576 unsigned long symbolNumber,
1577 unsigned long target )
1579 ppcJumpIsland *island;
1581 if( symbolNumber < oc->island_start_symbol ||
1582 symbolNumber - oc->island_start_symbol > oc->n_islands)
1585 island = &oc->jump_islands[symbolNumber - oc->island_start_symbol];
1587 // lis r12, hi16(target)
1588 island->lis_r12 = 0x3d80;
1589 island->hi_addr = target >> 16;
1591 // ori r12, r12, lo16(target)
1592 island->ori_r12_r12 = 0x618c;
1593 island->lo_addr = target & 0xffff;
1596 island->mtctr_r12 = 0x7d8903a6;
1599 island->bctr = 0x4e800420;
1601 return (unsigned long) island;
1605 ocFlushInstructionCache
1607 Flush the data & instruction caches.
1608 Because the PPC has split data/instruction caches, we have to
1609 do that whenever we modify code at runtime.
1612 static void ocFlushInstructionCache( ObjectCode *oc )
1614 int n = (oc->fileSize + sizeof( ppcJumpIsland ) * oc->n_islands + 3) / 4;
1615 unsigned long *p = (unsigned long *) oc->image;
1619 __asm__ volatile ( "dcbf 0,%0\n\t"
1627 __asm__ volatile ( "sync\n\t"
1633 /* --------------------------------------------------------------------------
1634 * PEi386 specifics (Win32 targets)
1635 * ------------------------------------------------------------------------*/
1637 /* The information for this linker comes from
1638 Microsoft Portable Executable
1639 and Common Object File Format Specification
1640 revision 5.1 January 1998
1641 which SimonM says comes from the MS Developer Network CDs.
1643 It can be found there (on older CDs), but can also be found
1646 http://www.microsoft.com/hwdev/hardware/PECOFF.asp
1648 (this is Rev 6.0 from February 1999).
1650 Things move, so if that fails, try searching for it via
1652 http://www.google.com/search?q=PE+COFF+specification
1654 The ultimate reference for the PE format is the Winnt.h
1655 header file that comes with the Platform SDKs; as always,
1656 implementations will drift wrt their documentation.
1658 A good background article on the PE format is Matt Pietrek's
1659 March 1994 article in Microsoft System Journal (MSJ)
1660 (Vol.9, No. 3): "Peering Inside the PE: A Tour of the
1661 Win32 Portable Executable File Format." The info in there
1662 has recently been updated in a two part article in
1663 MSDN magazine, issues Feb and March 2002,
1664 "Inside Windows: An In-Depth Look into the Win32 Portable
1665 Executable File Format"
1667 John Levine's book "Linkers and Loaders" contains useful
1672 #if defined(OBJFORMAT_PEi386)
1676 typedef unsigned char UChar;
1677 typedef unsigned short UInt16;
1678 typedef unsigned int UInt32;
1685 UInt16 NumberOfSections;
1686 UInt32 TimeDateStamp;
1687 UInt32 PointerToSymbolTable;
1688 UInt32 NumberOfSymbols;
1689 UInt16 SizeOfOptionalHeader;
1690 UInt16 Characteristics;
1694 #define sizeof_COFF_header 20
1701 UInt32 VirtualAddress;
1702 UInt32 SizeOfRawData;
1703 UInt32 PointerToRawData;
1704 UInt32 PointerToRelocations;
1705 UInt32 PointerToLinenumbers;
1706 UInt16 NumberOfRelocations;
1707 UInt16 NumberOfLineNumbers;
1708 UInt32 Characteristics;
1712 #define sizeof_COFF_section 40
1719 UInt16 SectionNumber;
1722 UChar NumberOfAuxSymbols;
1726 #define sizeof_COFF_symbol 18
1731 UInt32 VirtualAddress;
1732 UInt32 SymbolTableIndex;
1737 #define sizeof_COFF_reloc 10
1740 /* From PE spec doc, section 3.3.2 */
1741 /* Note use of MYIMAGE_* since IMAGE_* are already defined in
1742 windows.h -- for the same purpose, but I want to know what I'm
1744 #define MYIMAGE_FILE_RELOCS_STRIPPED 0x0001
1745 #define MYIMAGE_FILE_EXECUTABLE_IMAGE 0x0002
1746 #define MYIMAGE_FILE_DLL 0x2000
1747 #define MYIMAGE_FILE_SYSTEM 0x1000
1748 #define MYIMAGE_FILE_BYTES_REVERSED_HI 0x8000
1749 #define MYIMAGE_FILE_BYTES_REVERSED_LO 0x0080
1750 #define MYIMAGE_FILE_32BIT_MACHINE 0x0100
1752 /* From PE spec doc, section 5.4.2 and 5.4.4 */
1753 #define MYIMAGE_SYM_CLASS_EXTERNAL 2
1754 #define MYIMAGE_SYM_CLASS_STATIC 3
1755 #define MYIMAGE_SYM_UNDEFINED 0
1757 /* From PE spec doc, section 4.1 */
1758 #define MYIMAGE_SCN_CNT_CODE 0x00000020
1759 #define MYIMAGE_SCN_CNT_INITIALIZED_DATA 0x00000040
1760 #define MYIMAGE_SCN_LNK_NRELOC_OVFL 0x01000000
1762 /* From PE spec doc, section 5.2.1 */
1763 #define MYIMAGE_REL_I386_DIR32 0x0006
1764 #define MYIMAGE_REL_I386_REL32 0x0014
1767 /* We use myindex to calculate array addresses, rather than
1768 simply doing the normal subscript thing. That's because
1769 some of the above structs have sizes which are not
1770 a whole number of words. GCC rounds their sizes up to a
1771 whole number of words, which means that the address calcs
1772 arising from using normal C indexing or pointer arithmetic
1773 are just plain wrong. Sigh.
1776 myindex ( int scale, void* base, int index )
1779 ((UChar*)base) + scale * index;
1784 printName ( UChar* name, UChar* strtab )
1786 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
1787 UInt32 strtab_offset = * (UInt32*)(name+4);
1788 debugBelch("%s", strtab + strtab_offset );
1791 for (i = 0; i < 8; i++) {
1792 if (name[i] == 0) break;
1793 debugBelch("%c", name[i] );
1800 copyName ( UChar* name, UChar* strtab, UChar* dst, int dstSize )
1802 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
1803 UInt32 strtab_offset = * (UInt32*)(name+4);
1804 strncpy ( dst, strtab+strtab_offset, dstSize );
1810 if (name[i] == 0) break;
1820 cstring_from_COFF_symbol_name ( UChar* name, UChar* strtab )
1823 /* If the string is longer than 8 bytes, look in the
1824 string table for it -- this will be correctly zero terminated.
1826 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
1827 UInt32 strtab_offset = * (UInt32*)(name+4);
1828 return ((UChar*)strtab) + strtab_offset;
1830 /* Otherwise, if shorter than 8 bytes, return the original,
1831 which by defn is correctly terminated.
1833 if (name[7]==0) return name;
1834 /* The annoying case: 8 bytes. Copy into a temporary
1835 (which is never freed ...)
1837 newstr = stgMallocBytes(9, "cstring_from_COFF_symbol_name");
1839 strncpy(newstr,name,8);
1845 /* Just compares the short names (first 8 chars) */
1846 static COFF_section *
1847 findPEi386SectionCalled ( ObjectCode* oc, char* name )
1851 = (COFF_header*)(oc->image);
1852 COFF_section* sectab
1854 ((UChar*)(oc->image))
1855 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
1857 for (i = 0; i < hdr->NumberOfSections; i++) {
1860 COFF_section* section_i
1862 myindex ( sizeof_COFF_section, sectab, i );
1863 n1 = (UChar*) &(section_i->Name);
1865 if (n1[0]==n2[0] && n1[1]==n2[1] && n1[2]==n2[2] &&
1866 n1[3]==n2[3] && n1[4]==n2[4] && n1[5]==n2[5] &&
1867 n1[6]==n2[6] && n1[7]==n2[7])
1876 zapTrailingAtSign ( UChar* sym )
1878 # define my_isdigit(c) ((c) >= '0' && (c) <= '9')
1880 if (sym[0] == 0) return;
1882 while (sym[i] != 0) i++;
1885 while (j > 0 && my_isdigit(sym[j])) j--;
1886 if (j > 0 && sym[j] == '@' && j != i) sym[j] = 0;
1892 ocVerifyImage_PEi386 ( ObjectCode* oc )
1897 COFF_section* sectab;
1898 COFF_symbol* symtab;
1900 /* debugBelch("\nLOADING %s\n", oc->fileName); */
1901 hdr = (COFF_header*)(oc->image);
1902 sectab = (COFF_section*) (
1903 ((UChar*)(oc->image))
1904 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
1906 symtab = (COFF_symbol*) (
1907 ((UChar*)(oc->image))
1908 + hdr->PointerToSymbolTable
1910 strtab = ((UChar*)symtab)
1911 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
1913 if (hdr->Machine != 0x14c) {
1914 errorBelch("%s: Not x86 PEi386", oc->fileName);
1917 if (hdr->SizeOfOptionalHeader != 0) {
1918 errorBelch("%s: PEi386 with nonempty optional header", oc->fileName);
1921 if ( /* (hdr->Characteristics & MYIMAGE_FILE_RELOCS_STRIPPED) || */
1922 (hdr->Characteristics & MYIMAGE_FILE_EXECUTABLE_IMAGE) ||
1923 (hdr->Characteristics & MYIMAGE_FILE_DLL) ||
1924 (hdr->Characteristics & MYIMAGE_FILE_SYSTEM) ) {
1925 errorBelch("%s: Not a PEi386 object file", oc->fileName);
1928 if ( (hdr->Characteristics & MYIMAGE_FILE_BYTES_REVERSED_HI)
1929 /* || !(hdr->Characteristics & MYIMAGE_FILE_32BIT_MACHINE) */ ) {
1930 errorBelch("%s: Invalid PEi386 word size or endiannness: %d",
1932 (int)(hdr->Characteristics));
1935 /* If the string table size is way crazy, this might indicate that
1936 there are more than 64k relocations, despite claims to the
1937 contrary. Hence this test. */
1938 /* debugBelch("strtab size %d\n", * (UInt32*)strtab); */
1940 if ( (*(UInt32*)strtab) > 600000 ) {
1941 /* Note that 600k has no special significance other than being
1942 big enough to handle the almost-2MB-sized lumps that
1943 constitute HSwin32*.o. */
1944 debugBelch("PEi386 object has suspiciously large string table; > 64k relocs?");
1949 /* No further verification after this point; only debug printing. */
1951 IF_DEBUG(linker, i=1);
1952 if (i == 0) return 1;
1954 debugBelch( "sectab offset = %d\n", ((UChar*)sectab) - ((UChar*)hdr) );
1955 debugBelch( "symtab offset = %d\n", ((UChar*)symtab) - ((UChar*)hdr) );
1956 debugBelch( "strtab offset = %d\n", ((UChar*)strtab) - ((UChar*)hdr) );
1959 debugBelch( "Machine: 0x%x\n", (UInt32)(hdr->Machine) );
1960 debugBelch( "# sections: %d\n", (UInt32)(hdr->NumberOfSections) );
1961 debugBelch( "time/date: 0x%x\n", (UInt32)(hdr->TimeDateStamp) );
1962 debugBelch( "symtab offset: %d\n", (UInt32)(hdr->PointerToSymbolTable) );
1963 debugBelch( "# symbols: %d\n", (UInt32)(hdr->NumberOfSymbols) );
1964 debugBelch( "sz of opt hdr: %d\n", (UInt32)(hdr->SizeOfOptionalHeader) );
1965 debugBelch( "characteristics: 0x%x\n", (UInt32)(hdr->Characteristics) );
1967 /* Print the section table. */
1969 for (i = 0; i < hdr->NumberOfSections; i++) {
1971 COFF_section* sectab_i
1973 myindex ( sizeof_COFF_section, sectab, i );
1980 printName ( sectab_i->Name, strtab );
1990 sectab_i->VirtualSize,
1991 sectab_i->VirtualAddress,
1992 sectab_i->SizeOfRawData,
1993 sectab_i->PointerToRawData,
1994 sectab_i->NumberOfRelocations,
1995 sectab_i->PointerToRelocations,
1996 sectab_i->PointerToRawData
1998 reltab = (COFF_reloc*) (
1999 ((UChar*)(oc->image)) + sectab_i->PointerToRelocations
2002 if ( sectab_i->Characteristics & MYIMAGE_SCN_LNK_NRELOC_OVFL ) {
2003 /* If the relocation field (a short) has overflowed, the
2004 * real count can be found in the first reloc entry.
2006 * See Section 4.1 (last para) of the PE spec (rev6.0).
2008 COFF_reloc* rel = (COFF_reloc*)
2009 myindex ( sizeof_COFF_reloc, reltab, 0 );
2010 noRelocs = rel->VirtualAddress;
2013 noRelocs = sectab_i->NumberOfRelocations;
2017 for (; j < noRelocs; j++) {
2019 COFF_reloc* rel = (COFF_reloc*)
2020 myindex ( sizeof_COFF_reloc, reltab, j );
2022 " type 0x%-4x vaddr 0x%-8x name `",
2024 rel->VirtualAddress );
2025 sym = (COFF_symbol*)
2026 myindex ( sizeof_COFF_symbol, symtab, rel->SymbolTableIndex );
2027 /* Hmm..mysterious looking offset - what's it for? SOF */
2028 printName ( sym->Name, strtab -10 );
2035 debugBelch("string table has size 0x%x\n", * (UInt32*)strtab );
2036 debugBelch("---START of string table---\n");
2037 for (i = 4; i < *(Int32*)strtab; i++) {
2039 debugBelch("\n"); else
2040 debugBelch("%c", strtab[i] );
2042 debugBelch("--- END of string table---\n");
2047 COFF_symbol* symtab_i;
2048 if (i >= (Int32)(hdr->NumberOfSymbols)) break;
2049 symtab_i = (COFF_symbol*)
2050 myindex ( sizeof_COFF_symbol, symtab, i );
2056 printName ( symtab_i->Name, strtab );
2065 (Int32)(symtab_i->SectionNumber),
2066 (UInt32)symtab_i->Type,
2067 (UInt32)symtab_i->StorageClass,
2068 (UInt32)symtab_i->NumberOfAuxSymbols
2070 i += symtab_i->NumberOfAuxSymbols;
2080 ocGetNames_PEi386 ( ObjectCode* oc )
2083 COFF_section* sectab;
2084 COFF_symbol* symtab;
2091 hdr = (COFF_header*)(oc->image);
2092 sectab = (COFF_section*) (
2093 ((UChar*)(oc->image))
2094 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2096 symtab = (COFF_symbol*) (
2097 ((UChar*)(oc->image))
2098 + hdr->PointerToSymbolTable
2100 strtab = ((UChar*)(oc->image))
2101 + hdr->PointerToSymbolTable
2102 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
2104 /* Allocate space for any (local, anonymous) .bss sections. */
2106 for (i = 0; i < hdr->NumberOfSections; i++) {
2109 COFF_section* sectab_i
2111 myindex ( sizeof_COFF_section, sectab, i );
2112 if (0 != strcmp(sectab_i->Name, ".bss")) continue;
2113 /* sof 10/05: the PE spec text isn't too clear regarding what
2114 * the SizeOfRawData field is supposed to hold for object
2115 * file sections containing just uninitialized data -- for executables,
2116 * it is supposed to be zero; unclear what it's supposed to be
2117 * for object files. However, VirtualSize is guaranteed to be
2118 * zero for object files, which definitely suggests that SizeOfRawData
2119 * will be non-zero (where else would the size of this .bss section be
2120 * stored?) Looking at the COFF_section info for incoming object files,
2121 * this certainly appears to be the case.
2123 * => I suspect we've been incorrectly handling .bss sections in (relocatable)
2124 * object files up until now. This turned out to bite us with ghc-6.4.1's use
2125 * of gcc-3.4.x, which has started to emit initially-zeroed-out local 'static'
2126 * variable decls into to the .bss section. (The specific function in Q which
2127 * triggered this is libraries/base/cbits/dirUtils.c:__hscore_getFolderPath())
2129 if (sectab_i->VirtualSize == 0 && sectab_i->SizeOfRawData == 0) continue;
2130 /* This is a non-empty .bss section. Allocate zeroed space for
2131 it, and set its PointerToRawData field such that oc->image +
2132 PointerToRawData == addr_of_zeroed_space. */
2133 bss_sz = sectab_i->VirtualSize;
2134 if ( bss_sz < sectab_i->SizeOfRawData) { bss_sz = sectab_i->SizeOfRawData; }
2135 zspace = stgCallocBytes(1, bss_sz, "ocGetNames_PEi386(anonymous bss)");
2136 sectab_i->PointerToRawData = ((UChar*)zspace) - ((UChar*)(oc->image));
2137 addProddableBlock(oc, zspace, bss_sz);
2138 /* debugBelch("BSS anon section at 0x%x\n", zspace); */
2141 /* Copy section information into the ObjectCode. */
2143 for (i = 0; i < hdr->NumberOfSections; i++) {
2149 = SECTIONKIND_OTHER;
2150 COFF_section* sectab_i
2152 myindex ( sizeof_COFF_section, sectab, i );
2153 IF_DEBUG(linker, debugBelch("section name = %s\n", sectab_i->Name ));
2156 /* I'm sure this is the Right Way to do it. However, the
2157 alternative of testing the sectab_i->Name field seems to
2158 work ok with Cygwin.
2160 if (sectab_i->Characteristics & MYIMAGE_SCN_CNT_CODE ||
2161 sectab_i->Characteristics & MYIMAGE_SCN_CNT_INITIALIZED_DATA)
2162 kind = SECTIONKIND_CODE_OR_RODATA;
2165 if (0==strcmp(".text",sectab_i->Name) ||
2166 0==strcmp(".rdata",sectab_i->Name)||
2167 0==strcmp(".rodata",sectab_i->Name))
2168 kind = SECTIONKIND_CODE_OR_RODATA;
2169 if (0==strcmp(".data",sectab_i->Name) ||
2170 0==strcmp(".bss",sectab_i->Name))
2171 kind = SECTIONKIND_RWDATA;
2173 ASSERT(sectab_i->SizeOfRawData == 0 || sectab_i->VirtualSize == 0);
2174 sz = sectab_i->SizeOfRawData;
2175 if (sz < sectab_i->VirtualSize) sz = sectab_i->VirtualSize;
2177 start = ((UChar*)(oc->image)) + sectab_i->PointerToRawData;
2178 end = start + sz - 1;
2180 if (kind == SECTIONKIND_OTHER
2181 /* Ignore sections called which contain stabs debugging
2183 && 0 != strcmp(".stab", sectab_i->Name)
2184 && 0 != strcmp(".stabstr", sectab_i->Name)
2185 /* ignore constructor section for now */
2186 && 0 != strcmp(".ctors", sectab_i->Name)
2187 /* ignore section generated from .ident */
2188 && 0!= strcmp("/4", sectab_i->Name)
2190 errorBelch("Unknown PEi386 section name `%s' (while processing: %s)", sectab_i->Name, oc->fileName);
2194 if (kind != SECTIONKIND_OTHER && end >= start) {
2195 addSection(oc, kind, start, end);
2196 addProddableBlock(oc, start, end - start + 1);
2200 /* Copy exported symbols into the ObjectCode. */
2202 oc->n_symbols = hdr->NumberOfSymbols;
2203 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
2204 "ocGetNames_PEi386(oc->symbols)");
2205 /* Call me paranoid; I don't care. */
2206 for (i = 0; i < oc->n_symbols; i++)
2207 oc->symbols[i] = NULL;
2211 COFF_symbol* symtab_i;
2212 if (i >= (Int32)(hdr->NumberOfSymbols)) break;
2213 symtab_i = (COFF_symbol*)
2214 myindex ( sizeof_COFF_symbol, symtab, i );
2218 if (symtab_i->StorageClass == MYIMAGE_SYM_CLASS_EXTERNAL
2219 && symtab_i->SectionNumber != MYIMAGE_SYM_UNDEFINED) {
2220 /* This symbol is global and defined, viz, exported */
2221 /* for MYIMAGE_SYMCLASS_EXTERNAL
2222 && !MYIMAGE_SYM_UNDEFINED,
2223 the address of the symbol is:
2224 address of relevant section + offset in section
2226 COFF_section* sectabent
2227 = (COFF_section*) myindex ( sizeof_COFF_section,
2229 symtab_i->SectionNumber-1 );
2230 addr = ((UChar*)(oc->image))
2231 + (sectabent->PointerToRawData
2235 if (symtab_i->SectionNumber == MYIMAGE_SYM_UNDEFINED
2236 && symtab_i->Value > 0) {
2237 /* This symbol isn't in any section at all, ie, global bss.
2238 Allocate zeroed space for it. */
2239 addr = stgCallocBytes(1, symtab_i->Value,
2240 "ocGetNames_PEi386(non-anonymous bss)");
2241 addSection(oc, SECTIONKIND_RWDATA, addr,
2242 ((UChar*)addr) + symtab_i->Value - 1);
2243 addProddableBlock(oc, addr, symtab_i->Value);
2244 /* debugBelch("BSS section at 0x%x\n", addr); */
2247 if (addr != NULL ) {
2248 sname = cstring_from_COFF_symbol_name ( symtab_i->Name, strtab );
2249 /* debugBelch("addSymbol %p `%s \n", addr,sname); */
2250 IF_DEBUG(linker, debugBelch("addSymbol %p `%s'\n", addr,sname);)
2251 ASSERT(i >= 0 && i < oc->n_symbols);
2252 /* cstring_from_COFF_symbol_name always succeeds. */
2253 oc->symbols[i] = sname;
2254 ghciInsertStrHashTable(oc->fileName, symhash, sname, addr);
2258 "IGNORING symbol %d\n"
2262 printName ( symtab_i->Name, strtab );
2271 (Int32)(symtab_i->SectionNumber),
2272 (UInt32)symtab_i->Type,
2273 (UInt32)symtab_i->StorageClass,
2274 (UInt32)symtab_i->NumberOfAuxSymbols
2279 i += symtab_i->NumberOfAuxSymbols;
2288 ocResolve_PEi386 ( ObjectCode* oc )
2291 COFF_section* sectab;
2292 COFF_symbol* symtab;
2302 /* ToDo: should be variable-sized? But is at least safe in the
2303 sense of buffer-overrun-proof. */
2305 /* debugBelch("resolving for %s\n", oc->fileName); */
2307 hdr = (COFF_header*)(oc->image);
2308 sectab = (COFF_section*) (
2309 ((UChar*)(oc->image))
2310 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2312 symtab = (COFF_symbol*) (
2313 ((UChar*)(oc->image))
2314 + hdr->PointerToSymbolTable
2316 strtab = ((UChar*)(oc->image))
2317 + hdr->PointerToSymbolTable
2318 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
2320 for (i = 0; i < hdr->NumberOfSections; i++) {
2321 COFF_section* sectab_i
2323 myindex ( sizeof_COFF_section, sectab, i );
2326 ((UChar*)(oc->image)) + sectab_i->PointerToRelocations
2329 /* Ignore sections called which contain stabs debugging
2331 if (0 == strcmp(".stab", sectab_i->Name)
2332 || 0 == strcmp(".stabstr", sectab_i->Name)
2333 || 0 == strcmp(".ctors", sectab_i->Name))
2336 if ( sectab_i->Characteristics & MYIMAGE_SCN_LNK_NRELOC_OVFL ) {
2337 /* If the relocation field (a short) has overflowed, the
2338 * real count can be found in the first reloc entry.
2340 * See Section 4.1 (last para) of the PE spec (rev6.0).
2342 * Nov2003 update: the GNU linker still doesn't correctly
2343 * handle the generation of relocatable object files with
2344 * overflown relocations. Hence the output to warn of potential
2347 COFF_reloc* rel = (COFF_reloc*)
2348 myindex ( sizeof_COFF_reloc, reltab, 0 );
2349 noRelocs = rel->VirtualAddress;
2351 /* 10/05: we now assume (and check for) a GNU ld that is capable
2352 * of handling object files with (>2^16) of relocs.
2355 debugBelch("WARNING: Overflown relocation field (# relocs found: %u)\n",
2360 noRelocs = sectab_i->NumberOfRelocations;
2365 for (; j < noRelocs; j++) {
2367 COFF_reloc* reltab_j
2369 myindex ( sizeof_COFF_reloc, reltab, j );
2371 /* the location to patch */
2373 ((UChar*)(oc->image))
2374 + (sectab_i->PointerToRawData
2375 + reltab_j->VirtualAddress
2376 - sectab_i->VirtualAddress )
2378 /* the existing contents of pP */
2380 /* the symbol to connect to */
2381 sym = (COFF_symbol*)
2382 myindex ( sizeof_COFF_symbol,
2383 symtab, reltab_j->SymbolTableIndex );
2386 "reloc sec %2d num %3d: type 0x%-4x "
2387 "vaddr 0x%-8x name `",
2389 (UInt32)reltab_j->Type,
2390 reltab_j->VirtualAddress );
2391 printName ( sym->Name, strtab );
2392 debugBelch("'\n" ));
2394 if (sym->StorageClass == MYIMAGE_SYM_CLASS_STATIC) {
2395 COFF_section* section_sym
2396 = findPEi386SectionCalled ( oc, sym->Name );
2398 errorBelch("%s: can't find section `%s'", oc->fileName, sym->Name);
2401 S = ((UInt32)(oc->image))
2402 + (section_sym->PointerToRawData
2405 copyName ( sym->Name, strtab, symbol, 1000-1 );
2406 S = (UInt32) lookupLocalSymbol( oc, symbol );
2407 if ((void*)S != NULL) goto foundit;
2408 S = (UInt32) lookupSymbol( symbol );
2409 if ((void*)S != NULL) goto foundit;
2410 zapTrailingAtSign ( symbol );
2411 S = (UInt32) lookupLocalSymbol( oc, symbol );
2412 if ((void*)S != NULL) goto foundit;
2413 S = (UInt32) lookupSymbol( symbol );
2414 if ((void*)S != NULL) goto foundit;
2415 /* Newline first because the interactive linker has printed "linking..." */
2416 errorBelch("\n%s: unknown symbol `%s'", oc->fileName, symbol);
2420 checkProddableBlock(oc, pP);
2421 switch (reltab_j->Type) {
2422 case MYIMAGE_REL_I386_DIR32:
2425 case MYIMAGE_REL_I386_REL32:
2426 /* Tricky. We have to insert a displacement at
2427 pP which, when added to the PC for the _next_
2428 insn, gives the address of the target (S).
2429 Problem is to know the address of the next insn
2430 when we only know pP. We assume that this
2431 literal field is always the last in the insn,
2432 so that the address of the next insn is pP+4
2433 -- hence the constant 4.
2434 Also I don't know if A should be added, but so
2435 far it has always been zero.
2437 SOF 05/2005: 'A' (old contents of *pP) have been observed
2438 to contain values other than zero (the 'wx' object file
2439 that came with wxhaskell-0.9.4; dunno how it was compiled..).
2440 So, add displacement to old value instead of asserting
2441 A to be zero. Fixes wxhaskell-related crashes, and no other
2442 ill effects have been observed.
2444 Update: the reason why we're seeing these more elaborate
2445 relocations is due to a switch in how the NCG compiles SRTs
2446 and offsets to them from info tables. SRTs live in .(ro)data,
2447 while info tables live in .text, causing GAS to emit REL32/DISP32
2448 relocations with non-zero values. Adding the displacement is
2449 the right thing to do.
2451 *pP = S - ((UInt32)pP) - 4 + A;
2454 debugBelch("%s: unhandled PEi386 relocation type %d",
2455 oc->fileName, reltab_j->Type);
2462 IF_DEBUG(linker, debugBelch("completed %s", oc->fileName));
2466 #endif /* defined(OBJFORMAT_PEi386) */
2469 /* --------------------------------------------------------------------------
2471 * ------------------------------------------------------------------------*/
2473 #if defined(OBJFORMAT_ELF)
2478 #if defined(sparc_HOST_ARCH)
2479 # define ELF_TARGET_SPARC /* Used inside <elf.h> */
2480 #elif defined(i386_HOST_ARCH)
2481 # define ELF_TARGET_386 /* Used inside <elf.h> */
2482 #elif defined(x86_64_HOST_ARCH)
2483 # define ELF_TARGET_X64_64
2485 #elif defined (ia64_HOST_ARCH)
2486 # define ELF_TARGET_IA64 /* Used inside <elf.h> */
2488 # define ELF_FUNCTION_DESC /* calling convention uses function descriptors */
2489 # define ELF_NEED_GOT /* needs Global Offset Table */
2490 # define ELF_NEED_PLT /* needs Procedure Linkage Tables */
2493 #if !defined(openbsd_HOST_OS)
2496 /* openbsd elf has things in different places, with diff names */
2497 #include <elf_abi.h>
2498 #include <machine/reloc.h>
2499 #define R_386_32 RELOC_32
2500 #define R_386_PC32 RELOC_PC32
2504 * Define a set of types which can be used for both ELF32 and ELF64
2508 #define ELFCLASS ELFCLASS64
2509 #define Elf_Addr Elf64_Addr
2510 #define Elf_Word Elf64_Word
2511 #define Elf_Sword Elf64_Sword
2512 #define Elf_Ehdr Elf64_Ehdr
2513 #define Elf_Phdr Elf64_Phdr
2514 #define Elf_Shdr Elf64_Shdr
2515 #define Elf_Sym Elf64_Sym
2516 #define Elf_Rel Elf64_Rel
2517 #define Elf_Rela Elf64_Rela
2518 #define ELF_ST_TYPE ELF64_ST_TYPE
2519 #define ELF_ST_BIND ELF64_ST_BIND
2520 #define ELF_R_TYPE ELF64_R_TYPE
2521 #define ELF_R_SYM ELF64_R_SYM
2523 #define ELFCLASS ELFCLASS32
2524 #define Elf_Addr Elf32_Addr
2525 #define Elf_Word Elf32_Word
2526 #define Elf_Sword Elf32_Sword
2527 #define Elf_Ehdr Elf32_Ehdr
2528 #define Elf_Phdr Elf32_Phdr
2529 #define Elf_Shdr Elf32_Shdr
2530 #define Elf_Sym Elf32_Sym
2531 #define Elf_Rel Elf32_Rel
2532 #define Elf_Rela Elf32_Rela
2534 #define ELF_ST_TYPE ELF32_ST_TYPE
2537 #define ELF_ST_BIND ELF32_ST_BIND
2540 #define ELF_R_TYPE ELF32_R_TYPE
2543 #define ELF_R_SYM ELF32_R_SYM
2549 * Functions to allocate entries in dynamic sections. Currently we simply
2550 * preallocate a large number, and we don't check if a entry for the given
2551 * target already exists (a linear search is too slow). Ideally these
2552 * entries would be associated with symbols.
2555 /* These sizes sufficient to load HSbase + HShaskell98 + a few modules */
2556 #define GOT_SIZE 0x20000
2557 #define FUNCTION_TABLE_SIZE 0x10000
2558 #define PLT_SIZE 0x08000
2561 static Elf_Addr got[GOT_SIZE];
2562 static unsigned int gotIndex;
2563 static Elf_Addr gp_val = (Elf_Addr)got;
2566 allocateGOTEntry(Elf_Addr target)
2570 if (gotIndex >= GOT_SIZE)
2571 barf("Global offset table overflow");
2573 entry = &got[gotIndex++];
2575 return (Elf_Addr)entry;
2579 #ifdef ELF_FUNCTION_DESC
2585 static FunctionDesc functionTable[FUNCTION_TABLE_SIZE];
2586 static unsigned int functionTableIndex;
2589 allocateFunctionDesc(Elf_Addr target)
2591 FunctionDesc *entry;
2593 if (functionTableIndex >= FUNCTION_TABLE_SIZE)
2594 barf("Function table overflow");
2596 entry = &functionTable[functionTableIndex++];
2598 entry->gp = (Elf_Addr)gp_val;
2599 return (Elf_Addr)entry;
2603 copyFunctionDesc(Elf_Addr target)
2605 FunctionDesc *olddesc = (FunctionDesc *)target;
2606 FunctionDesc *newdesc;
2608 newdesc = (FunctionDesc *)allocateFunctionDesc(olddesc->ip);
2609 newdesc->gp = olddesc->gp;
2610 return (Elf_Addr)newdesc;
2615 #ifdef ia64_HOST_ARCH
2616 static void ia64_reloc_gprel22(Elf_Addr target, Elf_Addr value);
2617 static void ia64_reloc_pcrel21(Elf_Addr target, Elf_Addr value, ObjectCode *oc);
2619 static unsigned char plt_code[] =
2621 /* taken from binutils bfd/elfxx-ia64.c */
2622 0x0b, 0x78, 0x00, 0x02, 0x00, 0x24, /* [MMI] addl r15=0,r1;; */
2623 0x00, 0x41, 0x3c, 0x30, 0x28, 0xc0, /* ld8 r16=[r15],8 */
2624 0x01, 0x08, 0x00, 0x84, /* mov r14=r1;; */
2625 0x11, 0x08, 0x00, 0x1e, 0x18, 0x10, /* [MIB] ld8 r1=[r15] */
2626 0x60, 0x80, 0x04, 0x80, 0x03, 0x00, /* mov b6=r16 */
2627 0x60, 0x00, 0x80, 0x00 /* br.few b6;; */
2630 /* If we can't get to the function descriptor via gp, take a local copy of it */
2631 #define PLT_RELOC(code, target) { \
2632 Elf64_Sxword rel_value = target - gp_val; \
2633 if ((rel_value > 0x1fffff) || (rel_value < -0x1fffff)) \
2634 ia64_reloc_gprel22((Elf_Addr)code, copyFunctionDesc(target)); \
2636 ia64_reloc_gprel22((Elf_Addr)code, target); \
2641 unsigned char code[sizeof(plt_code)];
2645 allocatePLTEntry(Elf_Addr target, ObjectCode *oc)
2647 PLTEntry *plt = (PLTEntry *)oc->plt;
2650 if (oc->pltIndex >= PLT_SIZE)
2651 barf("Procedure table overflow");
2653 entry = &plt[oc->pltIndex++];
2654 memcpy(entry->code, plt_code, sizeof(entry->code));
2655 PLT_RELOC(entry->code, target);
2656 return (Elf_Addr)entry;
2662 return (PLT_SIZE * sizeof(PLTEntry));
2667 #if x86_64_HOST_ARCH
2668 // On x86_64, 32-bit relocations are often used, which requires that
2669 // we can resolve a symbol to a 32-bit offset. However, shared
2670 // libraries are placed outside the 2Gb area, which leaves us with a
2671 // problem when we need to give a 32-bit offset to a symbol in a
2674 // For a function symbol, we can allocate a bounce sequence inside the
2675 // 2Gb area and resolve the symbol to this. The bounce sequence is
2676 // simply a long jump instruction to the real location of the symbol.
2678 // For data references, we're screwed.
2681 unsigned char jmp[8]; /* 6 byte instruction: jmpq *0x00000002(%rip) */
2685 #define X86_64_BB_SIZE 1024
2687 static x86_64_bounce *x86_64_bounce_buffer = NULL;
2688 static nat x86_64_bb_next_off;
2691 x86_64_high_symbol( char *lbl, void *addr )
2693 x86_64_bounce *bounce;
2695 if ( x86_64_bounce_buffer == NULL ||
2696 x86_64_bb_next_off >= X86_64_BB_SIZE ) {
2697 x86_64_bounce_buffer =
2698 mmap(NULL, X86_64_BB_SIZE * sizeof(x86_64_bounce),
2699 PROT_EXEC|PROT_READ|PROT_WRITE,
2700 MAP_PRIVATE|MAP_32BIT|MAP_ANONYMOUS, -1, 0);
2701 if (x86_64_bounce_buffer == MAP_FAILED) {
2702 barf("x86_64_high_symbol: mmap failed");
2704 x86_64_bb_next_off = 0;
2706 bounce = &x86_64_bounce_buffer[x86_64_bb_next_off];
2707 bounce->jmp[0] = 0xff;
2708 bounce->jmp[1] = 0x25;
2709 bounce->jmp[2] = 0x02;
2710 bounce->jmp[3] = 0x00;
2711 bounce->jmp[4] = 0x00;
2712 bounce->jmp[5] = 0x00;
2713 bounce->addr = addr;
2714 x86_64_bb_next_off++;
2716 IF_DEBUG(linker, debugBelch("x86_64: allocated bounce entry for %s->%p at %p\n",
2717 lbl, addr, bounce));
2719 insertStrHashTable(symhash, lbl, bounce);
2726 * Generic ELF functions
2730 findElfSection ( void* objImage, Elf_Word sh_type )
2732 char* ehdrC = (char*)objImage;
2733 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2734 Elf_Shdr* shdr = (Elf_Shdr*)(ehdrC + ehdr->e_shoff);
2735 char* sh_strtab = ehdrC + shdr[ehdr->e_shstrndx].sh_offset;
2739 for (i = 0; i < ehdr->e_shnum; i++) {
2740 if (shdr[i].sh_type == sh_type
2741 /* Ignore the section header's string table. */
2742 && i != ehdr->e_shstrndx
2743 /* Ignore string tables named .stabstr, as they contain
2745 && 0 != memcmp(".stabstr", sh_strtab + shdr[i].sh_name, 8)
2747 ptr = ehdrC + shdr[i].sh_offset;
2754 #if defined(ia64_HOST_ARCH)
2756 findElfSegment ( void* objImage, Elf_Addr vaddr )
2758 char* ehdrC = (char*)objImage;
2759 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2760 Elf_Phdr* phdr = (Elf_Phdr*)(ehdrC + ehdr->e_phoff);
2761 Elf_Addr segaddr = 0;
2764 for (i = 0; i < ehdr->e_phnum; i++) {
2765 segaddr = phdr[i].p_vaddr;
2766 if ((vaddr >= segaddr) && (vaddr < segaddr + phdr[i].p_memsz))
2774 ocVerifyImage_ELF ( ObjectCode* oc )
2778 int i, j, nent, nstrtab, nsymtabs;
2782 char* ehdrC = (char*)(oc->image);
2783 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2785 if (ehdr->e_ident[EI_MAG0] != ELFMAG0 ||
2786 ehdr->e_ident[EI_MAG1] != ELFMAG1 ||
2787 ehdr->e_ident[EI_MAG2] != ELFMAG2 ||
2788 ehdr->e_ident[EI_MAG3] != ELFMAG3) {
2789 errorBelch("%s: not an ELF object", oc->fileName);
2793 if (ehdr->e_ident[EI_CLASS] != ELFCLASS) {
2794 errorBelch("%s: unsupported ELF format", oc->fileName);
2798 if (ehdr->e_ident[EI_DATA] == ELFDATA2LSB) {
2799 IF_DEBUG(linker,debugBelch( "Is little-endian\n" ));
2801 if (ehdr->e_ident[EI_DATA] == ELFDATA2MSB) {
2802 IF_DEBUG(linker,debugBelch( "Is big-endian\n" ));
2804 errorBelch("%s: unknown endiannness", oc->fileName);
2808 if (ehdr->e_type != ET_REL) {
2809 errorBelch("%s: not a relocatable object (.o) file", oc->fileName);
2812 IF_DEBUG(linker, debugBelch( "Is a relocatable object (.o) file\n" ));
2814 IF_DEBUG(linker,debugBelch( "Architecture is " ));
2815 switch (ehdr->e_machine) {
2816 case EM_386: IF_DEBUG(linker,debugBelch( "x86" )); break;
2817 #ifdef EM_SPARC32PLUS
2818 case EM_SPARC32PLUS:
2820 case EM_SPARC: IF_DEBUG(linker,debugBelch( "sparc" )); break;
2822 case EM_IA_64: IF_DEBUG(linker,debugBelch( "ia64" )); break;
2824 case EM_PPC: IF_DEBUG(linker,debugBelch( "powerpc32" )); break;
2826 case EM_X86_64: IF_DEBUG(linker,debugBelch( "x86_64" )); break;
2828 default: IF_DEBUG(linker,debugBelch( "unknown" ));
2829 errorBelch("%s: unknown architecture", oc->fileName);
2833 IF_DEBUG(linker,debugBelch(
2834 "\nSection header table: start %ld, n_entries %d, ent_size %d\n",
2835 (long)ehdr->e_shoff, ehdr->e_shnum, ehdr->e_shentsize ));
2837 ASSERT (ehdr->e_shentsize == sizeof(Elf_Shdr));
2839 shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
2841 if (ehdr->e_shstrndx == SHN_UNDEF) {
2842 errorBelch("%s: no section header string table", oc->fileName);
2845 IF_DEBUG(linker,debugBelch( "Section header string table is section %d\n",
2847 sh_strtab = ehdrC + shdr[ehdr->e_shstrndx].sh_offset;
2850 for (i = 0; i < ehdr->e_shnum; i++) {
2851 IF_DEBUG(linker,debugBelch("%2d: ", i ));
2852 IF_DEBUG(linker,debugBelch("type=%2d ", (int)shdr[i].sh_type ));
2853 IF_DEBUG(linker,debugBelch("size=%4d ", (int)shdr[i].sh_size ));
2854 IF_DEBUG(linker,debugBelch("offs=%4d ", (int)shdr[i].sh_offset ));
2855 IF_DEBUG(linker,debugBelch(" (%p .. %p) ",
2856 ehdrC + shdr[i].sh_offset,
2857 ehdrC + shdr[i].sh_offset + shdr[i].sh_size - 1));
2859 if (shdr[i].sh_type == SHT_REL) {
2860 IF_DEBUG(linker,debugBelch("Rel " ));
2861 } else if (shdr[i].sh_type == SHT_RELA) {
2862 IF_DEBUG(linker,debugBelch("RelA " ));
2864 IF_DEBUG(linker,debugBelch(" "));
2867 IF_DEBUG(linker,debugBelch("sname=%s\n", sh_strtab + shdr[i].sh_name ));
2871 IF_DEBUG(linker,debugBelch( "\nString tables" ));
2874 for (i = 0; i < ehdr->e_shnum; i++) {
2875 if (shdr[i].sh_type == SHT_STRTAB
2876 /* Ignore the section header's string table. */
2877 && i != ehdr->e_shstrndx
2878 /* Ignore string tables named .stabstr, as they contain
2880 && 0 != memcmp(".stabstr", sh_strtab + shdr[i].sh_name, 8)
2882 IF_DEBUG(linker,debugBelch(" section %d is a normal string table", i ));
2883 strtab = ehdrC + shdr[i].sh_offset;
2888 errorBelch("%s: no string tables, or too many", oc->fileName);
2893 IF_DEBUG(linker,debugBelch( "\nSymbol tables" ));
2894 for (i = 0; i < ehdr->e_shnum; i++) {
2895 if (shdr[i].sh_type != SHT_SYMTAB) continue;
2896 IF_DEBUG(linker,debugBelch( "section %d is a symbol table\n", i ));
2898 stab = (Elf_Sym*) (ehdrC + shdr[i].sh_offset);
2899 nent = shdr[i].sh_size / sizeof(Elf_Sym);
2900 IF_DEBUG(linker,debugBelch( " number of entries is apparently %d (%ld rem)\n",
2902 (long)shdr[i].sh_size % sizeof(Elf_Sym)
2904 if (0 != shdr[i].sh_size % sizeof(Elf_Sym)) {
2905 errorBelch("%s: non-integral number of symbol table entries", oc->fileName);
2908 for (j = 0; j < nent; j++) {
2909 IF_DEBUG(linker,debugBelch(" %2d ", j ));
2910 IF_DEBUG(linker,debugBelch(" sec=%-5d size=%-3d val=%5p ",
2911 (int)stab[j].st_shndx,
2912 (int)stab[j].st_size,
2913 (char*)stab[j].st_value ));
2915 IF_DEBUG(linker,debugBelch("type=" ));
2916 switch (ELF_ST_TYPE(stab[j].st_info)) {
2917 case STT_NOTYPE: IF_DEBUG(linker,debugBelch("notype " )); break;
2918 case STT_OBJECT: IF_DEBUG(linker,debugBelch("object " )); break;
2919 case STT_FUNC : IF_DEBUG(linker,debugBelch("func " )); break;
2920 case STT_SECTION: IF_DEBUG(linker,debugBelch("section" )); break;
2921 case STT_FILE: IF_DEBUG(linker,debugBelch("file " )); break;
2922 default: IF_DEBUG(linker,debugBelch("? " )); break;
2924 IF_DEBUG(linker,debugBelch(" " ));
2926 IF_DEBUG(linker,debugBelch("bind=" ));
2927 switch (ELF_ST_BIND(stab[j].st_info)) {
2928 case STB_LOCAL : IF_DEBUG(linker,debugBelch("local " )); break;
2929 case STB_GLOBAL: IF_DEBUG(linker,debugBelch("global" )); break;
2930 case STB_WEAK : IF_DEBUG(linker,debugBelch("weak " )); break;
2931 default: IF_DEBUG(linker,debugBelch("? " )); break;
2933 IF_DEBUG(linker,debugBelch(" " ));
2935 IF_DEBUG(linker,debugBelch("name=%s\n", strtab + stab[j].st_name ));
2939 if (nsymtabs == 0) {
2940 errorBelch("%s: didn't find any symbol tables", oc->fileName);
2947 static int getSectionKind_ELF( Elf_Shdr *hdr, int *is_bss )
2951 if (hdr->sh_type == SHT_PROGBITS
2952 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_EXECINSTR)) {
2953 /* .text-style section */
2954 return SECTIONKIND_CODE_OR_RODATA;
2957 if (hdr->sh_type == SHT_PROGBITS
2958 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_WRITE)) {
2959 /* .data-style section */
2960 return SECTIONKIND_RWDATA;
2963 if (hdr->sh_type == SHT_PROGBITS
2964 && (hdr->sh_flags & SHF_ALLOC) && !(hdr->sh_flags & SHF_WRITE)) {
2965 /* .rodata-style section */
2966 return SECTIONKIND_CODE_OR_RODATA;
2969 if (hdr->sh_type == SHT_NOBITS
2970 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_WRITE)) {
2971 /* .bss-style section */
2973 return SECTIONKIND_RWDATA;
2976 return SECTIONKIND_OTHER;
2981 ocGetNames_ELF ( ObjectCode* oc )
2986 char* ehdrC = (char*)(oc->image);
2987 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2988 char* strtab = findElfSection ( ehdrC, SHT_STRTAB );
2989 Elf_Shdr* shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
2991 ASSERT(symhash != NULL);
2994 errorBelch("%s: no strtab", oc->fileName);
2999 for (i = 0; i < ehdr->e_shnum; i++) {
3000 /* Figure out what kind of section it is. Logic derived from
3001 Figure 1.14 ("Special Sections") of the ELF document
3002 ("Portable Formats Specification, Version 1.1"). */
3004 SectionKind kind = getSectionKind_ELF(&shdr[i], &is_bss);
3006 if (is_bss && shdr[i].sh_size > 0) {
3007 /* This is a non-empty .bss section. Allocate zeroed space for
3008 it, and set its .sh_offset field such that
3009 ehdrC + .sh_offset == addr_of_zeroed_space. */
3010 char* zspace = stgCallocBytes(1, shdr[i].sh_size,
3011 "ocGetNames_ELF(BSS)");
3012 shdr[i].sh_offset = ((char*)zspace) - ((char*)ehdrC);
3014 debugBelch("BSS section at 0x%x, size %d\n",
3015 zspace, shdr[i].sh_size);
3019 /* fill in the section info */
3020 if (kind != SECTIONKIND_OTHER && shdr[i].sh_size > 0) {
3021 addProddableBlock(oc, ehdrC + shdr[i].sh_offset, shdr[i].sh_size);
3022 addSection(oc, kind, ehdrC + shdr[i].sh_offset,
3023 ehdrC + shdr[i].sh_offset + shdr[i].sh_size - 1);
3026 if (shdr[i].sh_type != SHT_SYMTAB) continue;
3028 /* copy stuff into this module's object symbol table */
3029 stab = (Elf_Sym*) (ehdrC + shdr[i].sh_offset);
3030 nent = shdr[i].sh_size / sizeof(Elf_Sym);
3032 oc->n_symbols = nent;
3033 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
3034 "ocGetNames_ELF(oc->symbols)");
3036 for (j = 0; j < nent; j++) {
3038 char isLocal = FALSE; /* avoids uninit-var warning */
3040 char* nm = strtab + stab[j].st_name;
3041 int secno = stab[j].st_shndx;
3043 /* Figure out if we want to add it; if so, set ad to its
3044 address. Otherwise leave ad == NULL. */
3046 if (secno == SHN_COMMON) {
3048 ad = stgCallocBytes(1, stab[j].st_size, "ocGetNames_ELF(COMMON)");
3050 debugBelch("COMMON symbol, size %d name %s\n",
3051 stab[j].st_size, nm);
3053 /* Pointless to do addProddableBlock() for this area,
3054 since the linker should never poke around in it. */
3057 if ( ( ELF_ST_BIND(stab[j].st_info)==STB_GLOBAL
3058 || ELF_ST_BIND(stab[j].st_info)==STB_LOCAL
3060 /* and not an undefined symbol */
3061 && stab[j].st_shndx != SHN_UNDEF
3062 /* and not in a "special section" */
3063 && stab[j].st_shndx < SHN_LORESERVE
3065 /* and it's a not a section or string table or anything silly */
3066 ( ELF_ST_TYPE(stab[j].st_info)==STT_FUNC ||
3067 ELF_ST_TYPE(stab[j].st_info)==STT_OBJECT ||
3068 ELF_ST_TYPE(stab[j].st_info)==STT_NOTYPE
3071 /* Section 0 is the undefined section, hence > and not >=. */
3072 ASSERT(secno > 0 && secno < ehdr->e_shnum);
3074 if (shdr[secno].sh_type == SHT_NOBITS) {
3075 debugBelch(" BSS symbol, size %d off %d name %s\n",
3076 stab[j].st_size, stab[j].st_value, nm);
3079 ad = ehdrC + shdr[ secno ].sh_offset + stab[j].st_value;
3080 if (ELF_ST_BIND(stab[j].st_info)==STB_LOCAL) {
3083 #ifdef ELF_FUNCTION_DESC
3084 /* dlsym() and the initialisation table both give us function
3085 * descriptors, so to be consistent we store function descriptors
3086 * in the symbol table */
3087 if (ELF_ST_TYPE(stab[j].st_info) == STT_FUNC)
3088 ad = (char *)allocateFunctionDesc((Elf_Addr)ad);
3090 IF_DEBUG(linker,debugBelch( "addOTabName(GLOB): %10p %s %s",
3091 ad, oc->fileName, nm ));
3096 /* And the decision is ... */
3100 oc->symbols[j] = nm;
3103 /* Ignore entirely. */
3105 ghciInsertStrHashTable(oc->fileName, symhash, nm, ad);
3109 IF_DEBUG(linker,debugBelch( "skipping `%s'\n",
3110 strtab + stab[j].st_name ));
3113 "skipping bind = %d, type = %d, shndx = %d `%s'\n",
3114 (int)ELF_ST_BIND(stab[j].st_info),
3115 (int)ELF_ST_TYPE(stab[j].st_info),
3116 (int)stab[j].st_shndx,
3117 strtab + stab[j].st_name
3120 oc->symbols[j] = NULL;
3129 /* Do ELF relocations which lack an explicit addend. All x86-linux
3130 relocations appear to be of this form. */
3132 do_Elf_Rel_relocations ( ObjectCode* oc, char* ehdrC,
3133 Elf_Shdr* shdr, int shnum,
3134 Elf_Sym* stab, char* strtab )
3139 Elf_Rel* rtab = (Elf_Rel*) (ehdrC + shdr[shnum].sh_offset);
3140 int nent = shdr[shnum].sh_size / sizeof(Elf_Rel);
3141 int target_shndx = shdr[shnum].sh_info;
3142 int symtab_shndx = shdr[shnum].sh_link;
3144 stab = (Elf_Sym*) (ehdrC + shdr[ symtab_shndx ].sh_offset);
3145 targ = (Elf_Word*)(ehdrC + shdr[ target_shndx ].sh_offset);
3146 IF_DEBUG(linker,debugBelch( "relocations for section %d using symtab %d\n",
3147 target_shndx, symtab_shndx ));
3149 /* Skip sections that we're not interested in. */
3152 SectionKind kind = getSectionKind_ELF(&shdr[target_shndx], &is_bss);
3153 if (kind == SECTIONKIND_OTHER) {
3154 IF_DEBUG(linker,debugBelch( "skipping (target section not loaded)"));
3159 for (j = 0; j < nent; j++) {
3160 Elf_Addr offset = rtab[j].r_offset;
3161 Elf_Addr info = rtab[j].r_info;
3163 Elf_Addr P = ((Elf_Addr)targ) + offset;
3164 Elf_Word* pP = (Elf_Word*)P;
3169 StgStablePtr stablePtr;
3172 IF_DEBUG(linker,debugBelch( "Rel entry %3d is raw(%6p %6p)",
3173 j, (void*)offset, (void*)info ));
3175 IF_DEBUG(linker,debugBelch( " ZERO" ));
3178 Elf_Sym sym = stab[ELF_R_SYM(info)];
3179 /* First see if it is a local symbol. */
3180 if (ELF_ST_BIND(sym.st_info) == STB_LOCAL) {
3181 /* Yes, so we can get the address directly from the ELF symbol
3183 symbol = sym.st_name==0 ? "(noname)" : strtab+sym.st_name;
3185 (ehdrC + shdr[ sym.st_shndx ].sh_offset
3186 + stab[ELF_R_SYM(info)].st_value);
3189 symbol = strtab + sym.st_name;
3190 stablePtr = (StgStablePtr)lookupHashTable(stablehash, (StgWord)symbol);
3191 if (NULL == stablePtr) {
3192 /* No, so look up the name in our global table. */
3193 S_tmp = lookupSymbol( symbol );
3194 S = (Elf_Addr)S_tmp;
3196 stableVal = deRefStablePtr( stablePtr );
3198 S = (Elf_Addr)S_tmp;
3202 errorBelch("%s: unknown symbol `%s'", oc->fileName, symbol);
3205 IF_DEBUG(linker,debugBelch( "`%s' resolves to %p\n", symbol, (void*)S ));
3208 IF_DEBUG(linker,debugBelch( "Reloc: P = %p S = %p A = %p\n",
3209 (void*)P, (void*)S, (void*)A ));
3210 checkProddableBlock ( oc, pP );
3214 switch (ELF_R_TYPE(info)) {
3215 # ifdef i386_HOST_ARCH
3216 case R_386_32: *pP = value; break;
3217 case R_386_PC32: *pP = value - P; break;
3220 errorBelch("%s: unhandled ELF relocation(Rel) type %lu\n",
3221 oc->fileName, (lnat)ELF_R_TYPE(info));
3229 /* Do ELF relocations for which explicit addends are supplied.
3230 sparc-solaris relocations appear to be of this form. */
3232 do_Elf_Rela_relocations ( ObjectCode* oc, char* ehdrC,
3233 Elf_Shdr* shdr, int shnum,
3234 Elf_Sym* stab, char* strtab )
3237 char *symbol = NULL;
3239 Elf_Rela* rtab = (Elf_Rela*) (ehdrC + shdr[shnum].sh_offset);
3240 int nent = shdr[shnum].sh_size / sizeof(Elf_Rela);
3241 int target_shndx = shdr[shnum].sh_info;
3242 int symtab_shndx = shdr[shnum].sh_link;
3244 stab = (Elf_Sym*) (ehdrC + shdr[ symtab_shndx ].sh_offset);
3245 targ = (Elf_Addr) (ehdrC + shdr[ target_shndx ].sh_offset);
3246 IF_DEBUG(linker,debugBelch( "relocations for section %d using symtab %d\n",
3247 target_shndx, symtab_shndx ));
3249 for (j = 0; j < nent; j++) {
3250 #if defined(DEBUG) || defined(sparc_HOST_ARCH) || defined(ia64_HOST_ARCH) || defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH)
3251 /* This #ifdef only serves to avoid unused-var warnings. */
3252 Elf_Addr offset = rtab[j].r_offset;
3253 Elf_Addr P = targ + offset;
3255 Elf_Addr info = rtab[j].r_info;
3256 Elf_Addr A = rtab[j].r_addend;
3260 # if defined(sparc_HOST_ARCH)
3261 Elf_Word* pP = (Elf_Word*)P;
3263 # elif defined(ia64_HOST_ARCH)
3264 Elf64_Xword *pP = (Elf64_Xword *)P;
3266 # elif defined(powerpc_HOST_ARCH)
3270 IF_DEBUG(linker,debugBelch( "Rel entry %3d is raw(%6p %6p %6p) ",
3271 j, (void*)offset, (void*)info,
3274 IF_DEBUG(linker,debugBelch( " ZERO" ));
3277 Elf_Sym sym = stab[ELF_R_SYM(info)];
3278 /* First see if it is a local symbol. */
3279 if (ELF_ST_BIND(sym.st_info) == STB_LOCAL) {
3280 /* Yes, so we can get the address directly from the ELF symbol
3282 symbol = sym.st_name==0 ? "(noname)" : strtab+sym.st_name;
3284 (ehdrC + shdr[ sym.st_shndx ].sh_offset
3285 + stab[ELF_R_SYM(info)].st_value);
3286 #ifdef ELF_FUNCTION_DESC
3287 /* Make a function descriptor for this function */
3288 if (S && ELF_ST_TYPE(sym.st_info) == STT_FUNC) {
3289 S = allocateFunctionDesc(S + A);
3294 /* No, so look up the name in our global table. */
3295 symbol = strtab + sym.st_name;
3296 S_tmp = lookupSymbol( symbol );
3297 S = (Elf_Addr)S_tmp;
3299 #ifdef ELF_FUNCTION_DESC
3300 /* If a function, already a function descriptor - we would
3301 have to copy it to add an offset. */
3302 if (S && (ELF_ST_TYPE(sym.st_info) == STT_FUNC) && (A != 0))
3303 errorBelch("%s: function %s with addend %p", oc->fileName, symbol, (void *)A);
3307 errorBelch("%s: unknown symbol `%s'", oc->fileName, symbol);
3310 IF_DEBUG(linker,debugBelch( "`%s' resolves to %p", symbol, (void*)S ));
3313 IF_DEBUG(linker,debugBelch("Reloc: P = %p S = %p A = %p\n",
3314 (void*)P, (void*)S, (void*)A ));
3315 /* checkProddableBlock ( oc, (void*)P ); */
3319 switch (ELF_R_TYPE(info)) {
3320 # if defined(sparc_HOST_ARCH)
3321 case R_SPARC_WDISP30:
3322 w1 = *pP & 0xC0000000;
3323 w2 = (Elf_Word)((value - P) >> 2);
3324 ASSERT((w2 & 0xC0000000) == 0);
3329 w1 = *pP & 0xFFC00000;
3330 w2 = (Elf_Word)(value >> 10);
3331 ASSERT((w2 & 0xFFC00000) == 0);
3337 w2 = (Elf_Word)(value & 0x3FF);
3338 ASSERT((w2 & ~0x3FF) == 0);
3342 /* According to the Sun documentation:
3344 This relocation type resembles R_SPARC_32, except it refers to an
3345 unaligned word. That is, the word to be relocated must be treated
3346 as four separate bytes with arbitrary alignment, not as a word
3347 aligned according to the architecture requirements.
3349 (JRS: which means that freeloading on the R_SPARC_32 case
3350 is probably wrong, but hey ...)
3354 w2 = (Elf_Word)value;
3357 # elif defined(ia64_HOST_ARCH)
3358 case R_IA64_DIR64LSB:
3359 case R_IA64_FPTR64LSB:
3362 case R_IA64_PCREL64LSB:
3365 case R_IA64_SEGREL64LSB:
3366 addr = findElfSegment(ehdrC, value);
3369 case R_IA64_GPREL22:
3370 ia64_reloc_gprel22(P, value);
3372 case R_IA64_LTOFF22:
3373 case R_IA64_LTOFF22X:
3374 case R_IA64_LTOFF_FPTR22:
3375 addr = allocateGOTEntry(value);
3376 ia64_reloc_gprel22(P, addr);
3378 case R_IA64_PCREL21B:
3379 ia64_reloc_pcrel21(P, S, oc);
3382 /* This goes with R_IA64_LTOFF22X and points to the load to
3383 * convert into a move. We don't implement relaxation. */
3385 # elif defined(powerpc_HOST_ARCH)
3386 case R_PPC_ADDR16_LO:
3387 *(Elf32_Half*) P = value;
3390 case R_PPC_ADDR16_HI:
3391 *(Elf32_Half*) P = value >> 16;
3394 case R_PPC_ADDR16_HA:
3395 *(Elf32_Half*) P = (value + 0x8000) >> 16;
3399 *(Elf32_Word *) P = value;
3403 *(Elf32_Word *) P = value - P;
3409 if( delta << 6 >> 6 != delta )
3411 value = makeJumpIsland( oc, ELF_R_SYM(info), value );
3414 if( value == 0 || delta << 6 >> 6 != delta )
3416 barf( "Unable to make ppcJumpIsland for #%d",
3422 *(Elf_Word *) P = (*(Elf_Word *) P & 0xfc000003)
3423 | (delta & 0x3fffffc);
3427 #if x86_64_HOST_ARCH
3429 *(Elf64_Xword *)P = value;
3434 StgInt64 off = value - P;
3435 if (off >= 0x7fffffffL || off < -0x80000000L) {
3436 barf("R_X86_64_PC32 relocation out of range: %s = %p",
3439 *(Elf64_Word *)P = (Elf64_Word)off;
3444 if (value >= 0x7fffffffL) {
3445 barf("R_X86_64_32 relocation out of range: %s = %p\n",
3448 *(Elf64_Word *)P = (Elf64_Word)value;
3452 if ((StgInt64)value > 0x7fffffffL || (StgInt64)value < -0x80000000L) {
3453 barf("R_X86_64_32S relocation out of range: %s = %p\n",
3456 *(Elf64_Sword *)P = (Elf64_Sword)value;
3461 errorBelch("%s: unhandled ELF relocation(RelA) type %lu\n",
3462 oc->fileName, (lnat)ELF_R_TYPE(info));
3471 ocResolve_ELF ( ObjectCode* oc )
3475 Elf_Sym* stab = NULL;
3476 char* ehdrC = (char*)(oc->image);
3477 Elf_Ehdr* ehdr = (Elf_Ehdr*) ehdrC;
3478 Elf_Shdr* shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
3480 /* first find "the" symbol table */
3481 stab = (Elf_Sym*) findElfSection ( ehdrC, SHT_SYMTAB );
3483 /* also go find the string table */
3484 strtab = findElfSection ( ehdrC, SHT_STRTAB );
3486 if (stab == NULL || strtab == NULL) {
3487 errorBelch("%s: can't find string or symbol table", oc->fileName);
3491 /* Process the relocation sections. */
3492 for (shnum = 0; shnum < ehdr->e_shnum; shnum++) {
3493 if (shdr[shnum].sh_type == SHT_REL) {
3494 ok = do_Elf_Rel_relocations ( oc, ehdrC, shdr,
3495 shnum, stab, strtab );
3499 if (shdr[shnum].sh_type == SHT_RELA) {
3500 ok = do_Elf_Rela_relocations ( oc, ehdrC, shdr,
3501 shnum, stab, strtab );
3506 /* Free the local symbol table; we won't need it again. */
3507 freeHashTable(oc->lochash, NULL);
3510 #if defined(powerpc_HOST_ARCH)
3511 ocFlushInstructionCache( oc );
3519 * Instructions are 41 bits long, packed into 128 bit bundles with a 5-bit template
3520 * at the front. The following utility functions pack and unpack instructions, and
3521 * take care of the most common relocations.
3524 #ifdef ia64_HOST_ARCH
3527 ia64_extract_instruction(Elf64_Xword *target)
3530 int slot = (Elf_Addr)target & 3;
3531 target = (Elf_Addr)target & ~3;
3539 return ((w1 >> 5) & 0x1ffffffffff);
3541 return (w1 >> 46) | ((w2 & 0x7fffff) << 18);
3545 barf("ia64_extract_instruction: invalid slot %p", target);
3550 ia64_deposit_instruction(Elf64_Xword *target, Elf64_Xword value)
3552 int slot = (Elf_Addr)target & 3;
3553 target = (Elf_Addr)target & ~3;
3558 *target |= value << 5;
3561 *target |= value << 46;
3562 *(target+1) |= value >> 18;
3565 *(target+1) |= value << 23;
3571 ia64_reloc_gprel22(Elf_Addr target, Elf_Addr value)
3573 Elf64_Xword instruction;
3574 Elf64_Sxword rel_value;
3576 rel_value = value - gp_val;
3577 if ((rel_value > 0x1fffff) || (rel_value < -0x1fffff))
3578 barf("GP-relative data out of range (address = 0x%lx, gp = 0x%lx)", value, gp_val);
3580 instruction = ia64_extract_instruction((Elf64_Xword *)target);
3581 instruction |= (((rel_value >> 0) & 0x07f) << 13) /* imm7b */
3582 | (((rel_value >> 7) & 0x1ff) << 27) /* imm9d */
3583 | (((rel_value >> 16) & 0x01f) << 22) /* imm5c */
3584 | ((Elf64_Xword)(rel_value < 0) << 36); /* s */
3585 ia64_deposit_instruction((Elf64_Xword *)target, instruction);
3589 ia64_reloc_pcrel21(Elf_Addr target, Elf_Addr value, ObjectCode *oc)
3591 Elf64_Xword instruction;
3592 Elf64_Sxword rel_value;
3595 entry = allocatePLTEntry(value, oc);
3597 rel_value = (entry >> 4) - (target >> 4);
3598 if ((rel_value > 0xfffff) || (rel_value < -0xfffff))
3599 barf("PLT entry too far away (entry = 0x%lx, target = 0x%lx)", entry, target);
3601 instruction = ia64_extract_instruction((Elf64_Xword *)target);
3602 instruction |= ((rel_value & 0xfffff) << 13) /* imm20b */
3603 | ((Elf64_Xword)(rel_value < 0) << 36); /* s */
3604 ia64_deposit_instruction((Elf64_Xword *)target, instruction);
3610 * PowerPC ELF specifics
3613 #ifdef powerpc_HOST_ARCH
3615 static int ocAllocateJumpIslands_ELF( ObjectCode *oc )
3621 ehdr = (Elf_Ehdr *) oc->image;
3622 shdr = (Elf_Shdr *) ( ((char *)oc->image) + ehdr->e_shoff );
3624 for( i = 0; i < ehdr->e_shnum; i++ )
3625 if( shdr[i].sh_type == SHT_SYMTAB )
3628 if( i == ehdr->e_shnum )
3630 errorBelch( "This ELF file contains no symtab" );
3634 if( shdr[i].sh_entsize != sizeof( Elf_Sym ) )
3636 errorBelch( "The entry size (%d) of the symtab isn't %d\n",
3637 shdr[i].sh_entsize, sizeof( Elf_Sym ) );
3642 return ocAllocateJumpIslands( oc, shdr[i].sh_size / sizeof( Elf_Sym ), 0 );
3645 #endif /* powerpc */
3649 /* --------------------------------------------------------------------------
3651 * ------------------------------------------------------------------------*/
3653 #if defined(OBJFORMAT_MACHO)
3656 Support for MachO linking on Darwin/MacOS X
3657 by Wolfgang Thaller (wolfgang.thaller@gmx.net)
3659 I hereby formally apologize for the hackish nature of this code.
3660 Things that need to be done:
3661 *) implement ocVerifyImage_MachO
3662 *) add still more sanity checks.
3665 #ifdef powerpc_HOST_ARCH
3666 static int ocAllocateJumpIslands_MachO(ObjectCode* oc)
3668 struct mach_header *header = (struct mach_header *) oc->image;
3669 struct load_command *lc = (struct load_command *) (header + 1);
3672 for( i = 0; i < header->ncmds; i++ )
3674 if( lc->cmd == LC_SYMTAB )
3676 // Find out the first and last undefined external
3677 // symbol, so we don't have to allocate too many
3679 struct symtab_command *symLC = (struct symtab_command *) lc;
3680 unsigned min = symLC->nsyms, max = 0;
3681 struct nlist *nlist =
3682 symLC ? (struct nlist*) ((char*) oc->image + symLC->symoff)
3684 for(i=0;i<symLC->nsyms;i++)
3686 if(nlist[i].n_type & N_STAB)
3688 else if(nlist[i].n_type & N_EXT)
3690 if((nlist[i].n_type & N_TYPE) == N_UNDF
3691 && (nlist[i].n_value == 0))
3701 return ocAllocateJumpIslands(oc, max - min + 1, min);
3706 lc = (struct load_command *) ( ((char *)lc) + lc->cmdsize );
3708 return ocAllocateJumpIslands(oc,0,0);
3712 static int ocVerifyImage_MachO(ObjectCode* oc STG_UNUSED)
3714 // FIXME: do some verifying here
3718 static int resolveImports(
3721 struct symtab_command *symLC,
3722 struct section *sect, // ptr to lazy or non-lazy symbol pointer section
3723 unsigned long *indirectSyms,
3724 struct nlist *nlist)
3727 size_t itemSize = 4;
3730 int isJumpTable = 0;
3731 if(!strcmp(sect->sectname,"__jump_table"))
3735 ASSERT(sect->reserved2 == itemSize);
3739 for(i=0; i*itemSize < sect->size;i++)
3741 // according to otool, reserved1 contains the first index into the indirect symbol table
3742 struct nlist *symbol = &nlist[indirectSyms[sect->reserved1+i]];
3743 char *nm = image + symLC->stroff + symbol->n_un.n_strx;
3746 if((symbol->n_type & N_TYPE) == N_UNDF
3747 && (symbol->n_type & N_EXT) && (symbol->n_value != 0))
3748 addr = (void*) (symbol->n_value);
3749 else if((addr = lookupLocalSymbol(oc,nm)) != NULL)
3752 addr = lookupSymbol(nm);
3755 errorBelch("\n%s: unknown symbol `%s'", oc->fileName, nm);
3763 checkProddableBlock(oc,image + sect->offset + i*itemSize);
3764 *(image + sect->offset + i*itemSize) = 0xe9; // jmp
3765 *(unsigned*)(image + sect->offset + i*itemSize + 1)
3766 = (char*)addr - (image + sect->offset + i*itemSize + 5);
3771 checkProddableBlock(oc,((void**)(image + sect->offset)) + i);
3772 ((void**)(image + sect->offset))[i] = addr;
3779 static unsigned long relocateAddress(
3782 struct section* sections,
3783 unsigned long address)
3786 for(i = 0; i < nSections; i++)
3788 if(sections[i].addr <= address
3789 && address < sections[i].addr + sections[i].size)
3791 return (unsigned long)oc->image
3792 + sections[i].offset + address - sections[i].addr;
3795 barf("Invalid Mach-O file:"
3796 "Address out of bounds while relocating object file");
3800 static int relocateSection(
3803 struct symtab_command *symLC, struct nlist *nlist,
3804 int nSections, struct section* sections, struct section *sect)
3806 struct relocation_info *relocs;
3809 if(!strcmp(sect->sectname,"__la_symbol_ptr"))
3811 else if(!strcmp(sect->sectname,"__nl_symbol_ptr"))
3813 else if(!strcmp(sect->sectname,"__la_sym_ptr2"))
3815 else if(!strcmp(sect->sectname,"__la_sym_ptr3"))
3819 relocs = (struct relocation_info*) (image + sect->reloff);
3823 if(relocs[i].r_address & R_SCATTERED)
3825 struct scattered_relocation_info *scat =
3826 (struct scattered_relocation_info*) &relocs[i];
3830 if(scat->r_length == 2)
3832 unsigned long word = 0;
3833 unsigned long* wordPtr = (unsigned long*) (image + sect->offset + scat->r_address);
3834 checkProddableBlock(oc,wordPtr);
3836 // Note on relocation types:
3837 // i386 uses the GENERIC_RELOC_* types,
3838 // while ppc uses special PPC_RELOC_* types.
3839 // *_RELOC_VANILLA and *_RELOC_PAIR have the same value
3840 // in both cases, all others are different.
3841 // Therefore, we use GENERIC_RELOC_VANILLA
3842 // and GENERIC_RELOC_PAIR instead of the PPC variants,
3843 // and use #ifdefs for the other types.
3845 // Step 1: Figure out what the relocated value should be
3846 if(scat->r_type == GENERIC_RELOC_VANILLA)
3848 word = *wordPtr + (unsigned long) relocateAddress(
3855 #ifdef powerpc_HOST_ARCH
3856 else if(scat->r_type == PPC_RELOC_SECTDIFF
3857 || scat->r_type == PPC_RELOC_LO16_SECTDIFF
3858 || scat->r_type == PPC_RELOC_HI16_SECTDIFF
3859 || scat->r_type == PPC_RELOC_HA16_SECTDIFF)
3861 else if(scat->r_type == GENERIC_RELOC_SECTDIFF)
3864 struct scattered_relocation_info *pair =
3865 (struct scattered_relocation_info*) &relocs[i+1];
3867 if(!pair->r_scattered || pair->r_type != GENERIC_RELOC_PAIR)
3868 barf("Invalid Mach-O file: "
3869 "RELOC_*_SECTDIFF not followed by RELOC_PAIR");
3871 word = (unsigned long)
3872 (relocateAddress(oc, nSections, sections, scat->r_value)
3873 - relocateAddress(oc, nSections, sections, pair->r_value));
3876 #ifdef powerpc_HOST_ARCH
3877 else if(scat->r_type == PPC_RELOC_HI16
3878 || scat->r_type == PPC_RELOC_LO16
3879 || scat->r_type == PPC_RELOC_HA16
3880 || scat->r_type == PPC_RELOC_LO14)
3881 { // these are generated by label+offset things
3882 struct relocation_info *pair = &relocs[i+1];
3883 if((pair->r_address & R_SCATTERED) || pair->r_type != PPC_RELOC_PAIR)
3884 barf("Invalid Mach-O file: "
3885 "PPC_RELOC_* not followed by PPC_RELOC_PAIR");
3887 if(scat->r_type == PPC_RELOC_LO16)
3889 word = ((unsigned short*) wordPtr)[1];
3890 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
3892 else if(scat->r_type == PPC_RELOC_LO14)
3894 barf("Unsupported Relocation: PPC_RELOC_LO14");
3895 word = ((unsigned short*) wordPtr)[1] & 0xFFFC;
3896 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
3898 else if(scat->r_type == PPC_RELOC_HI16)
3900 word = ((unsigned short*) wordPtr)[1] << 16;
3901 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF);
3903 else if(scat->r_type == PPC_RELOC_HA16)
3905 word = ((unsigned short*) wordPtr)[1] << 16;
3906 word += ((short)relocs[i+1].r_address & (short)0xFFFF);
3910 word += (unsigned long) relocateAddress(oc, nSections, sections, scat->r_value)
3917 continue; // ignore the others
3919 #ifdef powerpc_HOST_ARCH
3920 if(scat->r_type == GENERIC_RELOC_VANILLA
3921 || scat->r_type == PPC_RELOC_SECTDIFF)
3923 if(scat->r_type == GENERIC_RELOC_VANILLA
3924 || scat->r_type == GENERIC_RELOC_SECTDIFF)
3929 #ifdef powerpc_HOST_ARCH
3930 else if(scat->r_type == PPC_RELOC_LO16_SECTDIFF || scat->r_type == PPC_RELOC_LO16)
3932 ((unsigned short*) wordPtr)[1] = word & 0xFFFF;
3934 else if(scat->r_type == PPC_RELOC_HI16_SECTDIFF || scat->r_type == PPC_RELOC_HI16)
3936 ((unsigned short*) wordPtr)[1] = (word >> 16) & 0xFFFF;
3938 else if(scat->r_type == PPC_RELOC_HA16_SECTDIFF || scat->r_type == PPC_RELOC_HA16)
3940 ((unsigned short*) wordPtr)[1] = ((word >> 16) & 0xFFFF)
3941 + ((word & (1<<15)) ? 1 : 0);
3947 continue; // FIXME: I hope it's OK to ignore all the others.
3951 struct relocation_info *reloc = &relocs[i];
3952 if(reloc->r_pcrel && !reloc->r_extern)
3955 if(reloc->r_length == 2)
3957 unsigned long word = 0;
3958 #ifdef powerpc_HOST_ARCH
3959 unsigned long jumpIsland = 0;
3960 long offsetToJumpIsland = 0xBADBAD42; // initialise to bad value
3961 // to avoid warning and to catch
3965 unsigned long* wordPtr = (unsigned long*) (image + sect->offset + reloc->r_address);
3966 checkProddableBlock(oc,wordPtr);
3968 if(reloc->r_type == GENERIC_RELOC_VANILLA)
3972 #ifdef powerpc_HOST_ARCH
3973 else if(reloc->r_type == PPC_RELOC_LO16)
3975 word = ((unsigned short*) wordPtr)[1];
3976 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
3978 else if(reloc->r_type == PPC_RELOC_HI16)
3980 word = ((unsigned short*) wordPtr)[1] << 16;
3981 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF);
3983 else if(reloc->r_type == PPC_RELOC_HA16)
3985 word = ((unsigned short*) wordPtr)[1] << 16;
3986 word += ((short)relocs[i+1].r_address & (short)0xFFFF);
3988 else if(reloc->r_type == PPC_RELOC_BR24)
3991 word = (word & 0x03FFFFFC) | ((word & 0x02000000) ? 0xFC000000 : 0);
3995 if(!reloc->r_extern)
3998 sections[reloc->r_symbolnum-1].offset
3999 - sections[reloc->r_symbolnum-1].addr
4006 struct nlist *symbol = &nlist[reloc->r_symbolnum];
4007 char *nm = image + symLC->stroff + symbol->n_un.n_strx;
4008 void *symbolAddress = lookupSymbol(nm);
4011 errorBelch("\nunknown symbol `%s'", nm);
4017 #ifdef powerpc_HOST_ARCH
4018 // In the .o file, this should be a relative jump to NULL
4019 // and we'll change it to a relative jump to the symbol
4020 ASSERT(-word == reloc->r_address);
4021 jumpIsland = makeJumpIsland(oc,reloc->r_symbolnum,(unsigned long) symbolAddress);
4024 offsetToJumpIsland = word + jumpIsland
4025 - (((long)image) + sect->offset - sect->addr);
4028 word += (unsigned long) symbolAddress
4029 - (((long)image) + sect->offset - sect->addr);
4033 word += (unsigned long) symbolAddress;
4037 if(reloc->r_type == GENERIC_RELOC_VANILLA)
4042 #ifdef powerpc_HOST_ARCH
4043 else if(reloc->r_type == PPC_RELOC_LO16)
4045 ((unsigned short*) wordPtr)[1] = word & 0xFFFF;
4048 else if(reloc->r_type == PPC_RELOC_HI16)
4050 ((unsigned short*) wordPtr)[1] = (word >> 16) & 0xFFFF;
4053 else if(reloc->r_type == PPC_RELOC_HA16)
4055 ((unsigned short*) wordPtr)[1] = ((word >> 16) & 0xFFFF)
4056 + ((word & (1<<15)) ? 1 : 0);
4059 else if(reloc->r_type == PPC_RELOC_BR24)
4061 if((long)word > (long)0x01FFFFFF || (long)word < (long)0xFFE00000)
4063 // The branch offset is too large.
4064 // Therefore, we try to use a jump island.
4067 barf("unconditional relative branch out of range: "
4068 "no jump island available");
4071 word = offsetToJumpIsland;
4072 if((long)word > (long)0x01FFFFFF || (long)word < (long)0xFFE00000)
4073 barf("unconditional relative branch out of range: "
4074 "jump island out of range");
4076 *wordPtr = (*wordPtr & 0xFC000003) | (word & 0x03FFFFFC);
4081 barf("\nunknown relocation %d",reloc->r_type);
4088 static int ocGetNames_MachO(ObjectCode* oc)
4090 char *image = (char*) oc->image;
4091 struct mach_header *header = (struct mach_header*) image;
4092 struct load_command *lc = (struct load_command*) (image + sizeof(struct mach_header));
4093 unsigned i,curSymbol = 0;
4094 struct segment_command *segLC = NULL;
4095 struct section *sections;
4096 struct symtab_command *symLC = NULL;
4097 struct nlist *nlist;
4098 unsigned long commonSize = 0;
4099 char *commonStorage = NULL;
4100 unsigned long commonCounter;
4102 for(i=0;i<header->ncmds;i++)
4104 if(lc->cmd == LC_SEGMENT)
4105 segLC = (struct segment_command*) lc;
4106 else if(lc->cmd == LC_SYMTAB)
4107 symLC = (struct symtab_command*) lc;
4108 lc = (struct load_command *) ( ((char*)lc) + lc->cmdsize );
4111 sections = (struct section*) (segLC+1);
4112 nlist = symLC ? (struct nlist*) (image + symLC->symoff)
4115 for(i=0;i<segLC->nsects;i++)
4117 if(sections[i].size == 0)
4120 if((sections[i].flags & SECTION_TYPE) == S_ZEROFILL)
4122 char * zeroFillArea = stgCallocBytes(1,sections[i].size,
4123 "ocGetNames_MachO(common symbols)");
4124 sections[i].offset = zeroFillArea - image;
4127 if(!strcmp(sections[i].sectname,"__text"))
4128 addSection(oc, SECTIONKIND_CODE_OR_RODATA,
4129 (void*) (image + sections[i].offset),
4130 (void*) (image + sections[i].offset + sections[i].size));
4131 else if(!strcmp(sections[i].sectname,"__const"))
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,"__data"))
4136 addSection(oc, SECTIONKIND_RWDATA,
4137 (void*) (image + sections[i].offset),
4138 (void*) (image + sections[i].offset + sections[i].size));
4139 else if(!strcmp(sections[i].sectname,"__bss")
4140 || !strcmp(sections[i].sectname,"__common"))
4141 addSection(oc, SECTIONKIND_RWDATA,
4142 (void*) (image + sections[i].offset),
4143 (void*) (image + sections[i].offset + sections[i].size));
4145 addProddableBlock(oc, (void*) (image + sections[i].offset),
4149 // count external symbols defined here
4153 for(i=0;i<symLC->nsyms;i++)
4155 if(nlist[i].n_type & N_STAB)
4157 else if(nlist[i].n_type & N_EXT)
4159 if((nlist[i].n_type & N_TYPE) == N_UNDF
4160 && (nlist[i].n_value != 0))
4162 commonSize += nlist[i].n_value;
4165 else if((nlist[i].n_type & N_TYPE) == N_SECT)
4170 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
4171 "ocGetNames_MachO(oc->symbols)");
4175 for(i=0;i<symLC->nsyms;i++)
4177 if(nlist[i].n_type & N_STAB)
4179 else if((nlist[i].n_type & N_TYPE) == N_SECT)
4181 if(nlist[i].n_type & N_EXT)
4183 char *nm = image + symLC->stroff + nlist[i].n_un.n_strx;
4184 ghciInsertStrHashTable(oc->fileName, symhash, nm,
4186 + sections[nlist[i].n_sect-1].offset
4187 - sections[nlist[i].n_sect-1].addr
4188 + nlist[i].n_value);
4189 oc->symbols[curSymbol++] = nm;
4193 char *nm = image + symLC->stroff + nlist[i].n_un.n_strx;
4194 ghciInsertStrHashTable(oc->fileName, oc->lochash, nm,
4196 + sections[nlist[i].n_sect-1].offset
4197 - sections[nlist[i].n_sect-1].addr
4198 + nlist[i].n_value);
4204 commonStorage = stgCallocBytes(1,commonSize,"ocGetNames_MachO(common symbols)");
4205 commonCounter = (unsigned long)commonStorage;
4208 for(i=0;i<symLC->nsyms;i++)
4210 if((nlist[i].n_type & N_TYPE) == N_UNDF
4211 && (nlist[i].n_type & N_EXT) && (nlist[i].n_value != 0))
4213 char *nm = image + symLC->stroff + nlist[i].n_un.n_strx;
4214 unsigned long sz = nlist[i].n_value;
4216 nlist[i].n_value = commonCounter;
4218 ghciInsertStrHashTable(oc->fileName, symhash, nm,
4219 (void*)commonCounter);
4220 oc->symbols[curSymbol++] = nm;
4222 commonCounter += sz;
4229 static int ocResolve_MachO(ObjectCode* oc)
4231 char *image = (char*) oc->image;
4232 struct mach_header *header = (struct mach_header*) image;
4233 struct load_command *lc = (struct load_command*) (image + sizeof(struct mach_header));
4235 struct segment_command *segLC = NULL;
4236 struct section *sections;
4237 struct symtab_command *symLC = NULL;
4238 struct dysymtab_command *dsymLC = NULL;
4239 struct nlist *nlist;
4241 for(i=0;i<header->ncmds;i++)
4243 if(lc->cmd == LC_SEGMENT)
4244 segLC = (struct segment_command*) lc;
4245 else if(lc->cmd == LC_SYMTAB)
4246 symLC = (struct symtab_command*) lc;
4247 else if(lc->cmd == LC_DYSYMTAB)
4248 dsymLC = (struct dysymtab_command*) lc;
4249 lc = (struct load_command *) ( ((char*)lc) + lc->cmdsize );
4252 sections = (struct section*) (segLC+1);
4253 nlist = symLC ? (struct nlist*) (image + symLC->symoff)
4258 unsigned long *indirectSyms
4259 = (unsigned long*) (image + dsymLC->indirectsymoff);
4261 for(i=0;i<segLC->nsects;i++)
4263 if( !strcmp(sections[i].sectname,"__la_symbol_ptr")
4264 || !strcmp(sections[i].sectname,"__la_sym_ptr2")
4265 || !strcmp(sections[i].sectname,"__la_sym_ptr3"))
4267 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4270 else if(!strcmp(sections[i].sectname,"__nl_symbol_ptr")
4271 || !strcmp(sections[i].sectname,"__pointers"))
4273 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4276 else if(!strcmp(sections[i].sectname,"__jump_table"))
4278 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4284 for(i=0;i<segLC->nsects;i++)
4286 if(!relocateSection(oc,image,symLC,nlist,segLC->nsects,sections,§ions[i]))
4290 /* Free the local symbol table; we won't need it again. */
4291 freeHashTable(oc->lochash, NULL);
4294 #if defined (powerpc_HOST_ARCH)
4295 ocFlushInstructionCache( oc );
4301 #ifdef powerpc_HOST_ARCH
4303 * The Mach-O object format uses leading underscores. But not everywhere.
4304 * There is a small number of runtime support functions defined in
4305 * libcc_dynamic.a whose name does not have a leading underscore.
4306 * As a consequence, we can't get their address from C code.
4307 * We have to use inline assembler just to take the address of a function.
4311 static void machoInitSymbolsWithoutUnderscore()
4313 extern void* symbolsWithoutUnderscore[];
4314 void **p = symbolsWithoutUnderscore;
4315 __asm__ volatile(".globl _symbolsWithoutUnderscore\n.data\n_symbolsWithoutUnderscore:");
4319 __asm__ volatile(".long " # x);
4321 RTS_MACHO_NOUNDERLINE_SYMBOLS
4323 __asm__ volatile(".text");
4327 ghciInsertStrHashTable("(GHCi built-in symbols)", symhash, #x, *p++);
4329 RTS_MACHO_NOUNDERLINE_SYMBOLS
4336 * Figure out by how much to shift the entire Mach-O file in memory
4337 * when loading so that its single segment ends up 16-byte-aligned
4339 static int machoGetMisalignment( FILE * f )
4341 struct mach_header header;
4344 fread(&header, sizeof(header), 1, f);
4347 if(header.magic != MH_MAGIC)
4350 misalignment = (header.sizeofcmds + sizeof(header))
4353 return misalignment ? (16 - misalignment) : 0;