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;
1167 /* debugBelch("loadObj %s\n", path ); */
1169 /* Check that we haven't already loaded this object.
1170 Ignore requests to load multiple times */
1174 for (o = objects; o; o = o->next) {
1175 if (0 == strcmp(o->fileName, path)) {
1177 break; /* don't need to search further */
1181 IF_DEBUG(linker, debugBelch(
1182 "GHCi runtime linker: warning: looks like you're trying to load the\n"
1183 "same object file twice:\n"
1185 "GHCi will ignore this, but be warned.\n"
1187 return 1; /* success */
1191 oc = stgMallocBytes(sizeof(ObjectCode), "loadObj(oc)");
1193 # if defined(OBJFORMAT_ELF)
1194 oc->formatName = "ELF";
1195 # elif defined(OBJFORMAT_PEi386)
1196 oc->formatName = "PEi386";
1197 # elif defined(OBJFORMAT_MACHO)
1198 oc->formatName = "Mach-O";
1201 barf("loadObj: not implemented on this platform");
1204 r = stat(path, &st);
1205 if (r == -1) { return 0; }
1207 /* sigh, strdup() isn't a POSIX function, so do it the long way */
1208 oc->fileName = stgMallocBytes( strlen(path)+1, "loadObj" );
1209 strcpy(oc->fileName, path);
1211 oc->fileSize = st.st_size;
1213 oc->sections = NULL;
1214 oc->lochash = allocStrHashTable();
1215 oc->proddables = NULL;
1217 /* chain it onto the list of objects */
1222 #define ROUND_UP(x,size) ((x + size - 1) & ~(size - 1))
1224 /* On many architectures malloc'd memory isn't executable, so we need to use mmap. */
1226 #if defined(openbsd_HOST_OS)
1227 fd = open(path, O_RDONLY, S_IRUSR);
1229 fd = open(path, O_RDONLY);
1232 barf("loadObj: can't open `%s'", path);
1234 pagesize = getpagesize();
1236 #ifdef ia64_HOST_ARCH
1237 /* The PLT needs to be right before the object */
1238 n = ROUND_UP(PLTSize(), pagesize);
1239 oc->plt = mmap(NULL, n, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
1240 if (oc->plt == MAP_FAILED)
1241 barf("loadObj: can't allocate PLT");
1244 map_addr = oc->plt + n;
1247 n = ROUND_UP(oc->fileSize, pagesize);
1249 /* Link objects into the lower 2Gb on x86_64. GHC assumes the
1250 * small memory model on this architecture (see gcc docs,
1253 #ifdef x86_64_HOST_ARCH
1254 #define EXTRA_MAP_FLAGS MAP_32BIT
1256 #define EXTRA_MAP_FLAGS 0
1259 oc->image = mmap(map_addr, n, PROT_EXEC|PROT_READ|PROT_WRITE,
1260 MAP_PRIVATE|EXTRA_MAP_FLAGS, fd, 0);
1261 if (oc->image == MAP_FAILED)
1262 barf("loadObj: can't map `%s'", path);
1266 #else /* !USE_MMAP */
1268 /* load the image into memory */
1269 f = fopen(path, "rb");
1271 barf("loadObj: can't read `%s'", path);
1273 # if defined(mingw32_HOST_OS)
1274 // TODO: We would like to use allocateExec here, but allocateExec
1275 // cannot currently allocate blocks large enough.
1276 oc->image = VirtualAlloc(NULL, oc->fileSize, MEM_RESERVE | MEM_COMMIT,
1277 PAGE_EXECUTE_READWRITE);
1278 # elif defined(darwin_HOST_OS)
1279 // In a Mach-O .o file, all sections can and will be misaligned
1280 // if the total size of the headers is not a multiple of the
1281 // desired alignment. This is fine for .o files that only serve
1282 // as input for the static linker, but it's not fine for us,
1283 // as SSE (used by gcc for floating point) and Altivec require
1284 // 16-byte alignment.
1285 // We calculate the correct alignment from the header before
1286 // reading the file, and then we misalign oc->image on purpose so
1287 // that the actual sections end up aligned again.
1288 oc->misalignment = machoGetMisalignment(f);
1289 oc->image = stgMallocBytes(oc->fileSize + misalignment, "loadObj(image)");
1291 oc->image = stgMallocBytes(oc->fileSize, "loadObj(image)");
1294 n = fread ( oc->image, 1, oc->fileSize, f );
1295 if (n != oc->fileSize)
1296 barf("loadObj: error whilst reading `%s'", path);
1300 #endif /* USE_MMAP */
1302 # if defined(OBJFORMAT_MACHO) && defined(powerpc_HOST_ARCH)
1303 r = ocAllocateJumpIslands_MachO ( oc );
1304 if (!r) { return r; }
1305 # elif defined(OBJFORMAT_ELF) && defined(powerpc_HOST_ARCH)
1306 r = ocAllocateJumpIslands_ELF ( oc );
1307 if (!r) { return r; }
1310 /* verify the in-memory image */
1311 # if defined(OBJFORMAT_ELF)
1312 r = ocVerifyImage_ELF ( oc );
1313 # elif defined(OBJFORMAT_PEi386)
1314 r = ocVerifyImage_PEi386 ( oc );
1315 # elif defined(OBJFORMAT_MACHO)
1316 r = ocVerifyImage_MachO ( oc );
1318 barf("loadObj: no verify method");
1320 if (!r) { return r; }
1322 /* build the symbol list for this image */
1323 # if defined(OBJFORMAT_ELF)
1324 r = ocGetNames_ELF ( oc );
1325 # elif defined(OBJFORMAT_PEi386)
1326 r = ocGetNames_PEi386 ( oc );
1327 # elif defined(OBJFORMAT_MACHO)
1328 r = ocGetNames_MachO ( oc );
1330 barf("loadObj: no getNames method");
1332 if (!r) { return r; }
1334 /* loaded, but not resolved yet */
1335 oc->status = OBJECT_LOADED;
1340 /* -----------------------------------------------------------------------------
1341 * resolve all the currently unlinked objects in memory
1343 * Returns: 1 if ok, 0 on error.
1353 for (oc = objects; oc; oc = oc->next) {
1354 if (oc->status != OBJECT_RESOLVED) {
1355 # if defined(OBJFORMAT_ELF)
1356 r = ocResolve_ELF ( oc );
1357 # elif defined(OBJFORMAT_PEi386)
1358 r = ocResolve_PEi386 ( oc );
1359 # elif defined(OBJFORMAT_MACHO)
1360 r = ocResolve_MachO ( oc );
1362 barf("resolveObjs: not implemented on this platform");
1364 if (!r) { return r; }
1365 oc->status = OBJECT_RESOLVED;
1371 /* -----------------------------------------------------------------------------
1372 * delete an object from the pool
1375 unloadObj( char *path )
1377 ObjectCode *oc, *prev;
1379 ASSERT(symhash != NULL);
1380 ASSERT(objects != NULL);
1385 for (oc = objects; oc; prev = oc, oc = oc->next) {
1386 if (!strcmp(oc->fileName,path)) {
1388 /* Remove all the mappings for the symbols within this
1393 for (i = 0; i < oc->n_symbols; i++) {
1394 if (oc->symbols[i] != NULL) {
1395 removeStrHashTable(symhash, oc->symbols[i], NULL);
1403 prev->next = oc->next;
1406 // We're going to leave this in place, in case there are
1407 // any pointers from the heap into it:
1408 // #ifdef mingw32_HOST_OS
1409 // VirtualFree(oc->image);
1411 // stgFree(oc->image);
1413 stgFree(oc->fileName);
1414 stgFree(oc->symbols);
1415 stgFree(oc->sections);
1416 /* The local hash table should have been freed at the end
1417 of the ocResolve_ call on it. */
1418 ASSERT(oc->lochash == NULL);
1424 errorBelch("unloadObj: can't find `%s' to unload", path);
1428 /* -----------------------------------------------------------------------------
1429 * Sanity checking. For each ObjectCode, maintain a list of address ranges
1430 * which may be prodded during relocation, and abort if we try and write
1431 * outside any of these.
1433 static void addProddableBlock ( ObjectCode* oc, void* start, int size )
1436 = stgMallocBytes(sizeof(ProddableBlock), "addProddableBlock");
1437 /* debugBelch("aPB %p %p %d\n", oc, start, size); */
1441 pb->next = oc->proddables;
1442 oc->proddables = pb;
1445 static void checkProddableBlock ( ObjectCode* oc, void* addr )
1448 for (pb = oc->proddables; pb != NULL; pb = pb->next) {
1449 char* s = (char*)(pb->start);
1450 char* e = s + pb->size - 1;
1451 char* a = (char*)addr;
1452 /* Assumes that the biggest fixup involves a 4-byte write. This
1453 probably needs to be changed to 8 (ie, +7) on 64-bit
1455 if (a >= s && (a+3) <= e) return;
1457 barf("checkProddableBlock: invalid fixup in runtime linker");
1460 /* -----------------------------------------------------------------------------
1461 * Section management.
1463 static void addSection ( ObjectCode* oc, SectionKind kind,
1464 void* start, void* end )
1466 Section* s = stgMallocBytes(sizeof(Section), "addSection");
1470 s->next = oc->sections;
1473 debugBelch("addSection: %p-%p (size %d), kind %d\n",
1474 start, ((char*)end)-1, end - start + 1, kind );
1479 /* --------------------------------------------------------------------------
1480 * PowerPC specifics (jump islands)
1481 * ------------------------------------------------------------------------*/
1483 #if defined(powerpc_HOST_ARCH)
1486 ocAllocateJumpIslands
1488 Allocate additional space at the end of the object file image to make room
1491 PowerPC relative branch instructions have a 24 bit displacement field.
1492 As PPC code is always 4-byte-aligned, this yields a +-32MB range.
1493 If a particular imported symbol is outside this range, we have to redirect
1494 the jump to a short piece of new code that just loads the 32bit absolute
1495 address and jumps there.
1496 This function just allocates space for one 16 byte ppcJumpIsland for every
1497 undefined symbol in the object file. The code for the islands is filled in by
1498 makeJumpIsland below.
1501 static int ocAllocateJumpIslands( ObjectCode* oc, int count, int first )
1507 int misalignment = 0;
1509 misalignment = oc->misalignment;
1514 // round up to the nearest 4
1515 aligned = (oc->fileSize + 3) & ~3;
1518 #ifndef linux_HOST_OS /* mremap is a linux extension */
1519 #error ocAllocateJumpIslands doesnt want USE_MMAP to be defined
1522 pagesize = getpagesize();
1523 n = ROUND_UP( oc->fileSize, pagesize );
1524 m = ROUND_UP( aligned + sizeof (ppcJumpIsland) * count, pagesize );
1526 /* If we have a half-page-size file and map one page of it then
1527 * the part of the page after the size of the file remains accessible.
1528 * If, however, we map in 2 pages, the 2nd page is not accessible
1529 * and will give a "Bus Error" on access. To get around this, we check
1530 * if we need any extra pages for the jump islands and map them in
1531 * anonymously. We must check that we actually require extra pages
1532 * otherwise the attempt to mmap 0 pages of anonymous memory will
1538 /* The effect of this mremap() call is only the ensure that we have
1539 * a sufficient number of virtually contiguous pages. As returned from
1540 * mremap, the pages past the end of the file are not backed. We give
1541 * them a backing by using MAP_FIXED to map in anonymous pages.
1543 oc->image = mremap( oc->image, n, m, MREMAP_MAYMOVE );
1545 if( oc->image == MAP_FAILED )
1547 errorBelch( "Unable to mremap for Jump Islands\n" );
1551 if( mmap( oc->image + n, m - n, PROT_READ | PROT_WRITE | PROT_EXEC,
1552 MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED, 0, 0 ) == MAP_FAILED )
1554 errorBelch( "Unable to mmap( MAP_FIXED ) for Jump Islands\n" );
1560 oc->image -= misalignment;
1561 oc->image = stgReallocBytes( oc->image,
1563 aligned + sizeof (ppcJumpIsland) * count,
1564 "ocAllocateJumpIslands" );
1565 oc->image += misalignment;
1566 #endif /* USE_MMAP */
1568 oc->jump_islands = (ppcJumpIsland *) (oc->image + aligned);
1569 memset( oc->jump_islands, 0, sizeof (ppcJumpIsland) * count );
1572 oc->jump_islands = NULL;
1574 oc->island_start_symbol = first;
1575 oc->n_islands = count;
1580 static unsigned long makeJumpIsland( ObjectCode* oc,
1581 unsigned long symbolNumber,
1582 unsigned long target )
1584 ppcJumpIsland *island;
1586 if( symbolNumber < oc->island_start_symbol ||
1587 symbolNumber - oc->island_start_symbol > oc->n_islands)
1590 island = &oc->jump_islands[symbolNumber - oc->island_start_symbol];
1592 // lis r12, hi16(target)
1593 island->lis_r12 = 0x3d80;
1594 island->hi_addr = target >> 16;
1596 // ori r12, r12, lo16(target)
1597 island->ori_r12_r12 = 0x618c;
1598 island->lo_addr = target & 0xffff;
1601 island->mtctr_r12 = 0x7d8903a6;
1604 island->bctr = 0x4e800420;
1606 return (unsigned long) island;
1610 ocFlushInstructionCache
1612 Flush the data & instruction caches.
1613 Because the PPC has split data/instruction caches, we have to
1614 do that whenever we modify code at runtime.
1617 static void ocFlushInstructionCache( ObjectCode *oc )
1619 int n = (oc->fileSize + sizeof( ppcJumpIsland ) * oc->n_islands + 3) / 4;
1620 unsigned long *p = (unsigned long *) oc->image;
1624 __asm__ volatile ( "dcbf 0,%0\n\t"
1632 __asm__ volatile ( "sync\n\t"
1638 /* --------------------------------------------------------------------------
1639 * PEi386 specifics (Win32 targets)
1640 * ------------------------------------------------------------------------*/
1642 /* The information for this linker comes from
1643 Microsoft Portable Executable
1644 and Common Object File Format Specification
1645 revision 5.1 January 1998
1646 which SimonM says comes from the MS Developer Network CDs.
1648 It can be found there (on older CDs), but can also be found
1651 http://www.microsoft.com/hwdev/hardware/PECOFF.asp
1653 (this is Rev 6.0 from February 1999).
1655 Things move, so if that fails, try searching for it via
1657 http://www.google.com/search?q=PE+COFF+specification
1659 The ultimate reference for the PE format is the Winnt.h
1660 header file that comes with the Platform SDKs; as always,
1661 implementations will drift wrt their documentation.
1663 A good background article on the PE format is Matt Pietrek's
1664 March 1994 article in Microsoft System Journal (MSJ)
1665 (Vol.9, No. 3): "Peering Inside the PE: A Tour of the
1666 Win32 Portable Executable File Format." The info in there
1667 has recently been updated in a two part article in
1668 MSDN magazine, issues Feb and March 2002,
1669 "Inside Windows: An In-Depth Look into the Win32 Portable
1670 Executable File Format"
1672 John Levine's book "Linkers and Loaders" contains useful
1677 #if defined(OBJFORMAT_PEi386)
1681 typedef unsigned char UChar;
1682 typedef unsigned short UInt16;
1683 typedef unsigned int UInt32;
1690 UInt16 NumberOfSections;
1691 UInt32 TimeDateStamp;
1692 UInt32 PointerToSymbolTable;
1693 UInt32 NumberOfSymbols;
1694 UInt16 SizeOfOptionalHeader;
1695 UInt16 Characteristics;
1699 #define sizeof_COFF_header 20
1706 UInt32 VirtualAddress;
1707 UInt32 SizeOfRawData;
1708 UInt32 PointerToRawData;
1709 UInt32 PointerToRelocations;
1710 UInt32 PointerToLinenumbers;
1711 UInt16 NumberOfRelocations;
1712 UInt16 NumberOfLineNumbers;
1713 UInt32 Characteristics;
1717 #define sizeof_COFF_section 40
1724 UInt16 SectionNumber;
1727 UChar NumberOfAuxSymbols;
1731 #define sizeof_COFF_symbol 18
1736 UInt32 VirtualAddress;
1737 UInt32 SymbolTableIndex;
1742 #define sizeof_COFF_reloc 10
1745 /* From PE spec doc, section 3.3.2 */
1746 /* Note use of MYIMAGE_* since IMAGE_* are already defined in
1747 windows.h -- for the same purpose, but I want to know what I'm
1749 #define MYIMAGE_FILE_RELOCS_STRIPPED 0x0001
1750 #define MYIMAGE_FILE_EXECUTABLE_IMAGE 0x0002
1751 #define MYIMAGE_FILE_DLL 0x2000
1752 #define MYIMAGE_FILE_SYSTEM 0x1000
1753 #define MYIMAGE_FILE_BYTES_REVERSED_HI 0x8000
1754 #define MYIMAGE_FILE_BYTES_REVERSED_LO 0x0080
1755 #define MYIMAGE_FILE_32BIT_MACHINE 0x0100
1757 /* From PE spec doc, section 5.4.2 and 5.4.4 */
1758 #define MYIMAGE_SYM_CLASS_EXTERNAL 2
1759 #define MYIMAGE_SYM_CLASS_STATIC 3
1760 #define MYIMAGE_SYM_UNDEFINED 0
1762 /* From PE spec doc, section 4.1 */
1763 #define MYIMAGE_SCN_CNT_CODE 0x00000020
1764 #define MYIMAGE_SCN_CNT_INITIALIZED_DATA 0x00000040
1765 #define MYIMAGE_SCN_LNK_NRELOC_OVFL 0x01000000
1767 /* From PE spec doc, section 5.2.1 */
1768 #define MYIMAGE_REL_I386_DIR32 0x0006
1769 #define MYIMAGE_REL_I386_REL32 0x0014
1772 /* We use myindex to calculate array addresses, rather than
1773 simply doing the normal subscript thing. That's because
1774 some of the above structs have sizes which are not
1775 a whole number of words. GCC rounds their sizes up to a
1776 whole number of words, which means that the address calcs
1777 arising from using normal C indexing or pointer arithmetic
1778 are just plain wrong. Sigh.
1781 myindex ( int scale, void* base, int index )
1784 ((UChar*)base) + scale * index;
1789 printName ( UChar* name, UChar* strtab )
1791 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
1792 UInt32 strtab_offset = * (UInt32*)(name+4);
1793 debugBelch("%s", strtab + strtab_offset );
1796 for (i = 0; i < 8; i++) {
1797 if (name[i] == 0) break;
1798 debugBelch("%c", name[i] );
1805 copyName ( UChar* name, UChar* strtab, UChar* dst, int dstSize )
1807 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
1808 UInt32 strtab_offset = * (UInt32*)(name+4);
1809 strncpy ( dst, strtab+strtab_offset, dstSize );
1815 if (name[i] == 0) break;
1825 cstring_from_COFF_symbol_name ( UChar* name, UChar* strtab )
1828 /* If the string is longer than 8 bytes, look in the
1829 string table for it -- this will be correctly zero terminated.
1831 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
1832 UInt32 strtab_offset = * (UInt32*)(name+4);
1833 return ((UChar*)strtab) + strtab_offset;
1835 /* Otherwise, if shorter than 8 bytes, return the original,
1836 which by defn is correctly terminated.
1838 if (name[7]==0) return name;
1839 /* The annoying case: 8 bytes. Copy into a temporary
1840 (which is never freed ...)
1842 newstr = stgMallocBytes(9, "cstring_from_COFF_symbol_name");
1844 strncpy(newstr,name,8);
1850 /* Just compares the short names (first 8 chars) */
1851 static COFF_section *
1852 findPEi386SectionCalled ( ObjectCode* oc, char* name )
1856 = (COFF_header*)(oc->image);
1857 COFF_section* sectab
1859 ((UChar*)(oc->image))
1860 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
1862 for (i = 0; i < hdr->NumberOfSections; i++) {
1865 COFF_section* section_i
1867 myindex ( sizeof_COFF_section, sectab, i );
1868 n1 = (UChar*) &(section_i->Name);
1870 if (n1[0]==n2[0] && n1[1]==n2[1] && n1[2]==n2[2] &&
1871 n1[3]==n2[3] && n1[4]==n2[4] && n1[5]==n2[5] &&
1872 n1[6]==n2[6] && n1[7]==n2[7])
1881 zapTrailingAtSign ( UChar* sym )
1883 # define my_isdigit(c) ((c) >= '0' && (c) <= '9')
1885 if (sym[0] == 0) return;
1887 while (sym[i] != 0) i++;
1890 while (j > 0 && my_isdigit(sym[j])) j--;
1891 if (j > 0 && sym[j] == '@' && j != i) sym[j] = 0;
1897 ocVerifyImage_PEi386 ( ObjectCode* oc )
1902 COFF_section* sectab;
1903 COFF_symbol* symtab;
1905 /* debugBelch("\nLOADING %s\n", oc->fileName); */
1906 hdr = (COFF_header*)(oc->image);
1907 sectab = (COFF_section*) (
1908 ((UChar*)(oc->image))
1909 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
1911 symtab = (COFF_symbol*) (
1912 ((UChar*)(oc->image))
1913 + hdr->PointerToSymbolTable
1915 strtab = ((UChar*)symtab)
1916 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
1918 if (hdr->Machine != 0x14c) {
1919 errorBelch("%s: Not x86 PEi386", oc->fileName);
1922 if (hdr->SizeOfOptionalHeader != 0) {
1923 errorBelch("%s: PEi386 with nonempty optional header", oc->fileName);
1926 if ( /* (hdr->Characteristics & MYIMAGE_FILE_RELOCS_STRIPPED) || */
1927 (hdr->Characteristics & MYIMAGE_FILE_EXECUTABLE_IMAGE) ||
1928 (hdr->Characteristics & MYIMAGE_FILE_DLL) ||
1929 (hdr->Characteristics & MYIMAGE_FILE_SYSTEM) ) {
1930 errorBelch("%s: Not a PEi386 object file", oc->fileName);
1933 if ( (hdr->Characteristics & MYIMAGE_FILE_BYTES_REVERSED_HI)
1934 /* || !(hdr->Characteristics & MYIMAGE_FILE_32BIT_MACHINE) */ ) {
1935 errorBelch("%s: Invalid PEi386 word size or endiannness: %d",
1937 (int)(hdr->Characteristics));
1940 /* If the string table size is way crazy, this might indicate that
1941 there are more than 64k relocations, despite claims to the
1942 contrary. Hence this test. */
1943 /* debugBelch("strtab size %d\n", * (UInt32*)strtab); */
1945 if ( (*(UInt32*)strtab) > 600000 ) {
1946 /* Note that 600k has no special significance other than being
1947 big enough to handle the almost-2MB-sized lumps that
1948 constitute HSwin32*.o. */
1949 debugBelch("PEi386 object has suspiciously large string table; > 64k relocs?");
1954 /* No further verification after this point; only debug printing. */
1956 IF_DEBUG(linker, i=1);
1957 if (i == 0) return 1;
1959 debugBelch( "sectab offset = %d\n", ((UChar*)sectab) - ((UChar*)hdr) );
1960 debugBelch( "symtab offset = %d\n", ((UChar*)symtab) - ((UChar*)hdr) );
1961 debugBelch( "strtab offset = %d\n", ((UChar*)strtab) - ((UChar*)hdr) );
1964 debugBelch( "Machine: 0x%x\n", (UInt32)(hdr->Machine) );
1965 debugBelch( "# sections: %d\n", (UInt32)(hdr->NumberOfSections) );
1966 debugBelch( "time/date: 0x%x\n", (UInt32)(hdr->TimeDateStamp) );
1967 debugBelch( "symtab offset: %d\n", (UInt32)(hdr->PointerToSymbolTable) );
1968 debugBelch( "# symbols: %d\n", (UInt32)(hdr->NumberOfSymbols) );
1969 debugBelch( "sz of opt hdr: %d\n", (UInt32)(hdr->SizeOfOptionalHeader) );
1970 debugBelch( "characteristics: 0x%x\n", (UInt32)(hdr->Characteristics) );
1972 /* Print the section table. */
1974 for (i = 0; i < hdr->NumberOfSections; i++) {
1976 COFF_section* sectab_i
1978 myindex ( sizeof_COFF_section, sectab, i );
1985 printName ( sectab_i->Name, strtab );
1995 sectab_i->VirtualSize,
1996 sectab_i->VirtualAddress,
1997 sectab_i->SizeOfRawData,
1998 sectab_i->PointerToRawData,
1999 sectab_i->NumberOfRelocations,
2000 sectab_i->PointerToRelocations,
2001 sectab_i->PointerToRawData
2003 reltab = (COFF_reloc*) (
2004 ((UChar*)(oc->image)) + sectab_i->PointerToRelocations
2007 if ( sectab_i->Characteristics & MYIMAGE_SCN_LNK_NRELOC_OVFL ) {
2008 /* If the relocation field (a short) has overflowed, the
2009 * real count can be found in the first reloc entry.
2011 * See Section 4.1 (last para) of the PE spec (rev6.0).
2013 COFF_reloc* rel = (COFF_reloc*)
2014 myindex ( sizeof_COFF_reloc, reltab, 0 );
2015 noRelocs = rel->VirtualAddress;
2018 noRelocs = sectab_i->NumberOfRelocations;
2022 for (; j < noRelocs; j++) {
2024 COFF_reloc* rel = (COFF_reloc*)
2025 myindex ( sizeof_COFF_reloc, reltab, j );
2027 " type 0x%-4x vaddr 0x%-8x name `",
2029 rel->VirtualAddress );
2030 sym = (COFF_symbol*)
2031 myindex ( sizeof_COFF_symbol, symtab, rel->SymbolTableIndex );
2032 /* Hmm..mysterious looking offset - what's it for? SOF */
2033 printName ( sym->Name, strtab -10 );
2040 debugBelch("string table has size 0x%x\n", * (UInt32*)strtab );
2041 debugBelch("---START of string table---\n");
2042 for (i = 4; i < *(Int32*)strtab; i++) {
2044 debugBelch("\n"); else
2045 debugBelch("%c", strtab[i] );
2047 debugBelch("--- END of string table---\n");
2052 COFF_symbol* symtab_i;
2053 if (i >= (Int32)(hdr->NumberOfSymbols)) break;
2054 symtab_i = (COFF_symbol*)
2055 myindex ( sizeof_COFF_symbol, symtab, i );
2061 printName ( symtab_i->Name, strtab );
2070 (Int32)(symtab_i->SectionNumber),
2071 (UInt32)symtab_i->Type,
2072 (UInt32)symtab_i->StorageClass,
2073 (UInt32)symtab_i->NumberOfAuxSymbols
2075 i += symtab_i->NumberOfAuxSymbols;
2085 ocGetNames_PEi386 ( ObjectCode* oc )
2088 COFF_section* sectab;
2089 COFF_symbol* symtab;
2096 hdr = (COFF_header*)(oc->image);
2097 sectab = (COFF_section*) (
2098 ((UChar*)(oc->image))
2099 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2101 symtab = (COFF_symbol*) (
2102 ((UChar*)(oc->image))
2103 + hdr->PointerToSymbolTable
2105 strtab = ((UChar*)(oc->image))
2106 + hdr->PointerToSymbolTable
2107 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
2109 /* Allocate space for any (local, anonymous) .bss sections. */
2111 for (i = 0; i < hdr->NumberOfSections; i++) {
2114 COFF_section* sectab_i
2116 myindex ( sizeof_COFF_section, sectab, i );
2117 if (0 != strcmp(sectab_i->Name, ".bss")) continue;
2118 /* sof 10/05: the PE spec text isn't too clear regarding what
2119 * the SizeOfRawData field is supposed to hold for object
2120 * file sections containing just uninitialized data -- for executables,
2121 * it is supposed to be zero; unclear what it's supposed to be
2122 * for object files. However, VirtualSize is guaranteed to be
2123 * zero for object files, which definitely suggests that SizeOfRawData
2124 * will be non-zero (where else would the size of this .bss section be
2125 * stored?) Looking at the COFF_section info for incoming object files,
2126 * this certainly appears to be the case.
2128 * => I suspect we've been incorrectly handling .bss sections in (relocatable)
2129 * object files up until now. This turned out to bite us with ghc-6.4.1's use
2130 * of gcc-3.4.x, which has started to emit initially-zeroed-out local 'static'
2131 * variable decls into to the .bss section. (The specific function in Q which
2132 * triggered this is libraries/base/cbits/dirUtils.c:__hscore_getFolderPath())
2134 if (sectab_i->VirtualSize == 0 && sectab_i->SizeOfRawData == 0) continue;
2135 /* This is a non-empty .bss section. Allocate zeroed space for
2136 it, and set its PointerToRawData field such that oc->image +
2137 PointerToRawData == addr_of_zeroed_space. */
2138 bss_sz = sectab_i->VirtualSize;
2139 if ( bss_sz < sectab_i->SizeOfRawData) { bss_sz = sectab_i->SizeOfRawData; }
2140 zspace = stgCallocBytes(1, bss_sz, "ocGetNames_PEi386(anonymous bss)");
2141 sectab_i->PointerToRawData = ((UChar*)zspace) - ((UChar*)(oc->image));
2142 addProddableBlock(oc, zspace, bss_sz);
2143 /* debugBelch("BSS anon section at 0x%x\n", zspace); */
2146 /* Copy section information into the ObjectCode. */
2148 for (i = 0; i < hdr->NumberOfSections; i++) {
2154 = SECTIONKIND_OTHER;
2155 COFF_section* sectab_i
2157 myindex ( sizeof_COFF_section, sectab, i );
2158 IF_DEBUG(linker, debugBelch("section name = %s\n", sectab_i->Name ));
2161 /* I'm sure this is the Right Way to do it. However, the
2162 alternative of testing the sectab_i->Name field seems to
2163 work ok with Cygwin.
2165 if (sectab_i->Characteristics & MYIMAGE_SCN_CNT_CODE ||
2166 sectab_i->Characteristics & MYIMAGE_SCN_CNT_INITIALIZED_DATA)
2167 kind = SECTIONKIND_CODE_OR_RODATA;
2170 if (0==strcmp(".text",sectab_i->Name) ||
2171 0==strcmp(".rdata",sectab_i->Name)||
2172 0==strcmp(".rodata",sectab_i->Name))
2173 kind = SECTIONKIND_CODE_OR_RODATA;
2174 if (0==strcmp(".data",sectab_i->Name) ||
2175 0==strcmp(".bss",sectab_i->Name))
2176 kind = SECTIONKIND_RWDATA;
2178 ASSERT(sectab_i->SizeOfRawData == 0 || sectab_i->VirtualSize == 0);
2179 sz = sectab_i->SizeOfRawData;
2180 if (sz < sectab_i->VirtualSize) sz = sectab_i->VirtualSize;
2182 start = ((UChar*)(oc->image)) + sectab_i->PointerToRawData;
2183 end = start + sz - 1;
2185 if (kind == SECTIONKIND_OTHER
2186 /* Ignore sections called which contain stabs debugging
2188 && 0 != strcmp(".stab", sectab_i->Name)
2189 && 0 != strcmp(".stabstr", sectab_i->Name)
2190 /* ignore constructor section for now */
2191 && 0 != strcmp(".ctors", sectab_i->Name)
2192 /* ignore section generated from .ident */
2193 && 0!= strcmp("/4", sectab_i->Name)
2195 errorBelch("Unknown PEi386 section name `%s' (while processing: %s)", sectab_i->Name, oc->fileName);
2199 if (kind != SECTIONKIND_OTHER && end >= start) {
2200 addSection(oc, kind, start, end);
2201 addProddableBlock(oc, start, end - start + 1);
2205 /* Copy exported symbols into the ObjectCode. */
2207 oc->n_symbols = hdr->NumberOfSymbols;
2208 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
2209 "ocGetNames_PEi386(oc->symbols)");
2210 /* Call me paranoid; I don't care. */
2211 for (i = 0; i < oc->n_symbols; i++)
2212 oc->symbols[i] = NULL;
2216 COFF_symbol* symtab_i;
2217 if (i >= (Int32)(hdr->NumberOfSymbols)) break;
2218 symtab_i = (COFF_symbol*)
2219 myindex ( sizeof_COFF_symbol, symtab, i );
2223 if (symtab_i->StorageClass == MYIMAGE_SYM_CLASS_EXTERNAL
2224 && symtab_i->SectionNumber != MYIMAGE_SYM_UNDEFINED) {
2225 /* This symbol is global and defined, viz, exported */
2226 /* for MYIMAGE_SYMCLASS_EXTERNAL
2227 && !MYIMAGE_SYM_UNDEFINED,
2228 the address of the symbol is:
2229 address of relevant section + offset in section
2231 COFF_section* sectabent
2232 = (COFF_section*) myindex ( sizeof_COFF_section,
2234 symtab_i->SectionNumber-1 );
2235 addr = ((UChar*)(oc->image))
2236 + (sectabent->PointerToRawData
2240 if (symtab_i->SectionNumber == MYIMAGE_SYM_UNDEFINED
2241 && symtab_i->Value > 0) {
2242 /* This symbol isn't in any section at all, ie, global bss.
2243 Allocate zeroed space for it. */
2244 addr = stgCallocBytes(1, symtab_i->Value,
2245 "ocGetNames_PEi386(non-anonymous bss)");
2246 addSection(oc, SECTIONKIND_RWDATA, addr,
2247 ((UChar*)addr) + symtab_i->Value - 1);
2248 addProddableBlock(oc, addr, symtab_i->Value);
2249 /* debugBelch("BSS section at 0x%x\n", addr); */
2252 if (addr != NULL ) {
2253 sname = cstring_from_COFF_symbol_name ( symtab_i->Name, strtab );
2254 /* debugBelch("addSymbol %p `%s \n", addr,sname); */
2255 IF_DEBUG(linker, debugBelch("addSymbol %p `%s'\n", addr,sname);)
2256 ASSERT(i >= 0 && i < oc->n_symbols);
2257 /* cstring_from_COFF_symbol_name always succeeds. */
2258 oc->symbols[i] = sname;
2259 ghciInsertStrHashTable(oc->fileName, symhash, sname, addr);
2263 "IGNORING symbol %d\n"
2267 printName ( symtab_i->Name, strtab );
2276 (Int32)(symtab_i->SectionNumber),
2277 (UInt32)symtab_i->Type,
2278 (UInt32)symtab_i->StorageClass,
2279 (UInt32)symtab_i->NumberOfAuxSymbols
2284 i += symtab_i->NumberOfAuxSymbols;
2293 ocResolve_PEi386 ( ObjectCode* oc )
2296 COFF_section* sectab;
2297 COFF_symbol* symtab;
2307 /* ToDo: should be variable-sized? But is at least safe in the
2308 sense of buffer-overrun-proof. */
2310 /* debugBelch("resolving for %s\n", oc->fileName); */
2312 hdr = (COFF_header*)(oc->image);
2313 sectab = (COFF_section*) (
2314 ((UChar*)(oc->image))
2315 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2317 symtab = (COFF_symbol*) (
2318 ((UChar*)(oc->image))
2319 + hdr->PointerToSymbolTable
2321 strtab = ((UChar*)(oc->image))
2322 + hdr->PointerToSymbolTable
2323 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
2325 for (i = 0; i < hdr->NumberOfSections; i++) {
2326 COFF_section* sectab_i
2328 myindex ( sizeof_COFF_section, sectab, i );
2331 ((UChar*)(oc->image)) + sectab_i->PointerToRelocations
2334 /* Ignore sections called which contain stabs debugging
2336 if (0 == strcmp(".stab", sectab_i->Name)
2337 || 0 == strcmp(".stabstr", sectab_i->Name)
2338 || 0 == strcmp(".ctors", sectab_i->Name))
2341 if ( sectab_i->Characteristics & MYIMAGE_SCN_LNK_NRELOC_OVFL ) {
2342 /* If the relocation field (a short) has overflowed, the
2343 * real count can be found in the first reloc entry.
2345 * See Section 4.1 (last para) of the PE spec (rev6.0).
2347 * Nov2003 update: the GNU linker still doesn't correctly
2348 * handle the generation of relocatable object files with
2349 * overflown relocations. Hence the output to warn of potential
2352 COFF_reloc* rel = (COFF_reloc*)
2353 myindex ( sizeof_COFF_reloc, reltab, 0 );
2354 noRelocs = rel->VirtualAddress;
2356 /* 10/05: we now assume (and check for) a GNU ld that is capable
2357 * of handling object files with (>2^16) of relocs.
2360 debugBelch("WARNING: Overflown relocation field (# relocs found: %u)\n",
2365 noRelocs = sectab_i->NumberOfRelocations;
2370 for (; j < noRelocs; j++) {
2372 COFF_reloc* reltab_j
2374 myindex ( sizeof_COFF_reloc, reltab, j );
2376 /* the location to patch */
2378 ((UChar*)(oc->image))
2379 + (sectab_i->PointerToRawData
2380 + reltab_j->VirtualAddress
2381 - sectab_i->VirtualAddress )
2383 /* the existing contents of pP */
2385 /* the symbol to connect to */
2386 sym = (COFF_symbol*)
2387 myindex ( sizeof_COFF_symbol,
2388 symtab, reltab_j->SymbolTableIndex );
2391 "reloc sec %2d num %3d: type 0x%-4x "
2392 "vaddr 0x%-8x name `",
2394 (UInt32)reltab_j->Type,
2395 reltab_j->VirtualAddress );
2396 printName ( sym->Name, strtab );
2397 debugBelch("'\n" ));
2399 if (sym->StorageClass == MYIMAGE_SYM_CLASS_STATIC) {
2400 COFF_section* section_sym
2401 = findPEi386SectionCalled ( oc, sym->Name );
2403 errorBelch("%s: can't find section `%s'", oc->fileName, sym->Name);
2406 S = ((UInt32)(oc->image))
2407 + (section_sym->PointerToRawData
2410 copyName ( sym->Name, strtab, symbol, 1000-1 );
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 zapTrailingAtSign ( symbol );
2416 S = (UInt32) lookupLocalSymbol( oc, symbol );
2417 if ((void*)S != NULL) goto foundit;
2418 S = (UInt32) lookupSymbol( symbol );
2419 if ((void*)S != NULL) goto foundit;
2420 /* Newline first because the interactive linker has printed "linking..." */
2421 errorBelch("\n%s: unknown symbol `%s'", oc->fileName, symbol);
2425 checkProddableBlock(oc, pP);
2426 switch (reltab_j->Type) {
2427 case MYIMAGE_REL_I386_DIR32:
2430 case MYIMAGE_REL_I386_REL32:
2431 /* Tricky. We have to insert a displacement at
2432 pP which, when added to the PC for the _next_
2433 insn, gives the address of the target (S).
2434 Problem is to know the address of the next insn
2435 when we only know pP. We assume that this
2436 literal field is always the last in the insn,
2437 so that the address of the next insn is pP+4
2438 -- hence the constant 4.
2439 Also I don't know if A should be added, but so
2440 far it has always been zero.
2442 SOF 05/2005: 'A' (old contents of *pP) have been observed
2443 to contain values other than zero (the 'wx' object file
2444 that came with wxhaskell-0.9.4; dunno how it was compiled..).
2445 So, add displacement to old value instead of asserting
2446 A to be zero. Fixes wxhaskell-related crashes, and no other
2447 ill effects have been observed.
2449 Update: the reason why we're seeing these more elaborate
2450 relocations is due to a switch in how the NCG compiles SRTs
2451 and offsets to them from info tables. SRTs live in .(ro)data,
2452 while info tables live in .text, causing GAS to emit REL32/DISP32
2453 relocations with non-zero values. Adding the displacement is
2454 the right thing to do.
2456 *pP = S - ((UInt32)pP) - 4 + A;
2459 debugBelch("%s: unhandled PEi386 relocation type %d",
2460 oc->fileName, reltab_j->Type);
2467 IF_DEBUG(linker, debugBelch("completed %s", oc->fileName));
2471 #endif /* defined(OBJFORMAT_PEi386) */
2474 /* --------------------------------------------------------------------------
2476 * ------------------------------------------------------------------------*/
2478 #if defined(OBJFORMAT_ELF)
2483 #if defined(sparc_HOST_ARCH)
2484 # define ELF_TARGET_SPARC /* Used inside <elf.h> */
2485 #elif defined(i386_HOST_ARCH)
2486 # define ELF_TARGET_386 /* Used inside <elf.h> */
2487 #elif defined(x86_64_HOST_ARCH)
2488 # define ELF_TARGET_X64_64
2490 #elif defined (ia64_HOST_ARCH)
2491 # define ELF_TARGET_IA64 /* Used inside <elf.h> */
2493 # define ELF_FUNCTION_DESC /* calling convention uses function descriptors */
2494 # define ELF_NEED_GOT /* needs Global Offset Table */
2495 # define ELF_NEED_PLT /* needs Procedure Linkage Tables */
2498 #if !defined(openbsd_HOST_OS)
2501 /* openbsd elf has things in different places, with diff names */
2502 #include <elf_abi.h>
2503 #include <machine/reloc.h>
2504 #define R_386_32 RELOC_32
2505 #define R_386_PC32 RELOC_PC32
2509 * Define a set of types which can be used for both ELF32 and ELF64
2513 #define ELFCLASS ELFCLASS64
2514 #define Elf_Addr Elf64_Addr
2515 #define Elf_Word Elf64_Word
2516 #define Elf_Sword Elf64_Sword
2517 #define Elf_Ehdr Elf64_Ehdr
2518 #define Elf_Phdr Elf64_Phdr
2519 #define Elf_Shdr Elf64_Shdr
2520 #define Elf_Sym Elf64_Sym
2521 #define Elf_Rel Elf64_Rel
2522 #define Elf_Rela Elf64_Rela
2523 #define ELF_ST_TYPE ELF64_ST_TYPE
2524 #define ELF_ST_BIND ELF64_ST_BIND
2525 #define ELF_R_TYPE ELF64_R_TYPE
2526 #define ELF_R_SYM ELF64_R_SYM
2528 #define ELFCLASS ELFCLASS32
2529 #define Elf_Addr Elf32_Addr
2530 #define Elf_Word Elf32_Word
2531 #define Elf_Sword Elf32_Sword
2532 #define Elf_Ehdr Elf32_Ehdr
2533 #define Elf_Phdr Elf32_Phdr
2534 #define Elf_Shdr Elf32_Shdr
2535 #define Elf_Sym Elf32_Sym
2536 #define Elf_Rel Elf32_Rel
2537 #define Elf_Rela Elf32_Rela
2539 #define ELF_ST_TYPE ELF32_ST_TYPE
2542 #define ELF_ST_BIND ELF32_ST_BIND
2545 #define ELF_R_TYPE ELF32_R_TYPE
2548 #define ELF_R_SYM ELF32_R_SYM
2554 * Functions to allocate entries in dynamic sections. Currently we simply
2555 * preallocate a large number, and we don't check if a entry for the given
2556 * target already exists (a linear search is too slow). Ideally these
2557 * entries would be associated with symbols.
2560 /* These sizes sufficient to load HSbase + HShaskell98 + a few modules */
2561 #define GOT_SIZE 0x20000
2562 #define FUNCTION_TABLE_SIZE 0x10000
2563 #define PLT_SIZE 0x08000
2566 static Elf_Addr got[GOT_SIZE];
2567 static unsigned int gotIndex;
2568 static Elf_Addr gp_val = (Elf_Addr)got;
2571 allocateGOTEntry(Elf_Addr target)
2575 if (gotIndex >= GOT_SIZE)
2576 barf("Global offset table overflow");
2578 entry = &got[gotIndex++];
2580 return (Elf_Addr)entry;
2584 #ifdef ELF_FUNCTION_DESC
2590 static FunctionDesc functionTable[FUNCTION_TABLE_SIZE];
2591 static unsigned int functionTableIndex;
2594 allocateFunctionDesc(Elf_Addr target)
2596 FunctionDesc *entry;
2598 if (functionTableIndex >= FUNCTION_TABLE_SIZE)
2599 barf("Function table overflow");
2601 entry = &functionTable[functionTableIndex++];
2603 entry->gp = (Elf_Addr)gp_val;
2604 return (Elf_Addr)entry;
2608 copyFunctionDesc(Elf_Addr target)
2610 FunctionDesc *olddesc = (FunctionDesc *)target;
2611 FunctionDesc *newdesc;
2613 newdesc = (FunctionDesc *)allocateFunctionDesc(olddesc->ip);
2614 newdesc->gp = olddesc->gp;
2615 return (Elf_Addr)newdesc;
2620 #ifdef ia64_HOST_ARCH
2621 static void ia64_reloc_gprel22(Elf_Addr target, Elf_Addr value);
2622 static void ia64_reloc_pcrel21(Elf_Addr target, Elf_Addr value, ObjectCode *oc);
2624 static unsigned char plt_code[] =
2626 /* taken from binutils bfd/elfxx-ia64.c */
2627 0x0b, 0x78, 0x00, 0x02, 0x00, 0x24, /* [MMI] addl r15=0,r1;; */
2628 0x00, 0x41, 0x3c, 0x30, 0x28, 0xc0, /* ld8 r16=[r15],8 */
2629 0x01, 0x08, 0x00, 0x84, /* mov r14=r1;; */
2630 0x11, 0x08, 0x00, 0x1e, 0x18, 0x10, /* [MIB] ld8 r1=[r15] */
2631 0x60, 0x80, 0x04, 0x80, 0x03, 0x00, /* mov b6=r16 */
2632 0x60, 0x00, 0x80, 0x00 /* br.few b6;; */
2635 /* If we can't get to the function descriptor via gp, take a local copy of it */
2636 #define PLT_RELOC(code, target) { \
2637 Elf64_Sxword rel_value = target - gp_val; \
2638 if ((rel_value > 0x1fffff) || (rel_value < -0x1fffff)) \
2639 ia64_reloc_gprel22((Elf_Addr)code, copyFunctionDesc(target)); \
2641 ia64_reloc_gprel22((Elf_Addr)code, target); \
2646 unsigned char code[sizeof(plt_code)];
2650 allocatePLTEntry(Elf_Addr target, ObjectCode *oc)
2652 PLTEntry *plt = (PLTEntry *)oc->plt;
2655 if (oc->pltIndex >= PLT_SIZE)
2656 barf("Procedure table overflow");
2658 entry = &plt[oc->pltIndex++];
2659 memcpy(entry->code, plt_code, sizeof(entry->code));
2660 PLT_RELOC(entry->code, target);
2661 return (Elf_Addr)entry;
2667 return (PLT_SIZE * sizeof(PLTEntry));
2672 #if x86_64_HOST_ARCH
2673 // On x86_64, 32-bit relocations are often used, which requires that
2674 // we can resolve a symbol to a 32-bit offset. However, shared
2675 // libraries are placed outside the 2Gb area, which leaves us with a
2676 // problem when we need to give a 32-bit offset to a symbol in a
2679 // For a function symbol, we can allocate a bounce sequence inside the
2680 // 2Gb area and resolve the symbol to this. The bounce sequence is
2681 // simply a long jump instruction to the real location of the symbol.
2683 // For data references, we're screwed.
2686 unsigned char jmp[8]; /* 6 byte instruction: jmpq *0x00000002(%rip) */
2690 #define X86_64_BB_SIZE 1024
2692 static x86_64_bounce *x86_64_bounce_buffer = NULL;
2693 static nat x86_64_bb_next_off;
2696 x86_64_high_symbol( char *lbl, void *addr )
2698 x86_64_bounce *bounce;
2700 if ( x86_64_bounce_buffer == NULL ||
2701 x86_64_bb_next_off >= X86_64_BB_SIZE ) {
2702 x86_64_bounce_buffer =
2703 mmap(NULL, X86_64_BB_SIZE * sizeof(x86_64_bounce),
2704 PROT_EXEC|PROT_READ|PROT_WRITE,
2705 MAP_PRIVATE|MAP_32BIT|MAP_ANONYMOUS, -1, 0);
2706 if (x86_64_bounce_buffer == MAP_FAILED) {
2707 barf("x86_64_high_symbol: mmap failed");
2709 x86_64_bb_next_off = 0;
2711 bounce = &x86_64_bounce_buffer[x86_64_bb_next_off];
2712 bounce->jmp[0] = 0xff;
2713 bounce->jmp[1] = 0x25;
2714 bounce->jmp[2] = 0x02;
2715 bounce->jmp[3] = 0x00;
2716 bounce->jmp[4] = 0x00;
2717 bounce->jmp[5] = 0x00;
2718 bounce->addr = addr;
2719 x86_64_bb_next_off++;
2721 IF_DEBUG(linker, debugBelch("x86_64: allocated bounce entry for %s->%p at %p\n",
2722 lbl, addr, bounce));
2724 insertStrHashTable(symhash, lbl, bounce);
2731 * Generic ELF functions
2735 findElfSection ( void* objImage, Elf_Word sh_type )
2737 char* ehdrC = (char*)objImage;
2738 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2739 Elf_Shdr* shdr = (Elf_Shdr*)(ehdrC + ehdr->e_shoff);
2740 char* sh_strtab = ehdrC + shdr[ehdr->e_shstrndx].sh_offset;
2744 for (i = 0; i < ehdr->e_shnum; i++) {
2745 if (shdr[i].sh_type == sh_type
2746 /* Ignore the section header's string table. */
2747 && i != ehdr->e_shstrndx
2748 /* Ignore string tables named .stabstr, as they contain
2750 && 0 != memcmp(".stabstr", sh_strtab + shdr[i].sh_name, 8)
2752 ptr = ehdrC + shdr[i].sh_offset;
2759 #if defined(ia64_HOST_ARCH)
2761 findElfSegment ( void* objImage, Elf_Addr vaddr )
2763 char* ehdrC = (char*)objImage;
2764 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2765 Elf_Phdr* phdr = (Elf_Phdr*)(ehdrC + ehdr->e_phoff);
2766 Elf_Addr segaddr = 0;
2769 for (i = 0; i < ehdr->e_phnum; i++) {
2770 segaddr = phdr[i].p_vaddr;
2771 if ((vaddr >= segaddr) && (vaddr < segaddr + phdr[i].p_memsz))
2779 ocVerifyImage_ELF ( ObjectCode* oc )
2783 int i, j, nent, nstrtab, nsymtabs;
2787 char* ehdrC = (char*)(oc->image);
2788 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2790 if (ehdr->e_ident[EI_MAG0] != ELFMAG0 ||
2791 ehdr->e_ident[EI_MAG1] != ELFMAG1 ||
2792 ehdr->e_ident[EI_MAG2] != ELFMAG2 ||
2793 ehdr->e_ident[EI_MAG3] != ELFMAG3) {
2794 errorBelch("%s: not an ELF object", oc->fileName);
2798 if (ehdr->e_ident[EI_CLASS] != ELFCLASS) {
2799 errorBelch("%s: unsupported ELF format", oc->fileName);
2803 if (ehdr->e_ident[EI_DATA] == ELFDATA2LSB) {
2804 IF_DEBUG(linker,debugBelch( "Is little-endian\n" ));
2806 if (ehdr->e_ident[EI_DATA] == ELFDATA2MSB) {
2807 IF_DEBUG(linker,debugBelch( "Is big-endian\n" ));
2809 errorBelch("%s: unknown endiannness", oc->fileName);
2813 if (ehdr->e_type != ET_REL) {
2814 errorBelch("%s: not a relocatable object (.o) file", oc->fileName);
2817 IF_DEBUG(linker, debugBelch( "Is a relocatable object (.o) file\n" ));
2819 IF_DEBUG(linker,debugBelch( "Architecture is " ));
2820 switch (ehdr->e_machine) {
2821 case EM_386: IF_DEBUG(linker,debugBelch( "x86" )); break;
2822 #ifdef EM_SPARC32PLUS
2823 case EM_SPARC32PLUS:
2825 case EM_SPARC: IF_DEBUG(linker,debugBelch( "sparc" )); break;
2827 case EM_IA_64: IF_DEBUG(linker,debugBelch( "ia64" )); break;
2829 case EM_PPC: IF_DEBUG(linker,debugBelch( "powerpc32" )); break;
2831 case EM_X86_64: IF_DEBUG(linker,debugBelch( "x86_64" )); break;
2833 default: IF_DEBUG(linker,debugBelch( "unknown" ));
2834 errorBelch("%s: unknown architecture", oc->fileName);
2838 IF_DEBUG(linker,debugBelch(
2839 "\nSection header table: start %ld, n_entries %d, ent_size %d\n",
2840 (long)ehdr->e_shoff, ehdr->e_shnum, ehdr->e_shentsize ));
2842 ASSERT (ehdr->e_shentsize == sizeof(Elf_Shdr));
2844 shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
2846 if (ehdr->e_shstrndx == SHN_UNDEF) {
2847 errorBelch("%s: no section header string table", oc->fileName);
2850 IF_DEBUG(linker,debugBelch( "Section header string table is section %d\n",
2852 sh_strtab = ehdrC + shdr[ehdr->e_shstrndx].sh_offset;
2855 for (i = 0; i < ehdr->e_shnum; i++) {
2856 IF_DEBUG(linker,debugBelch("%2d: ", i ));
2857 IF_DEBUG(linker,debugBelch("type=%2d ", (int)shdr[i].sh_type ));
2858 IF_DEBUG(linker,debugBelch("size=%4d ", (int)shdr[i].sh_size ));
2859 IF_DEBUG(linker,debugBelch("offs=%4d ", (int)shdr[i].sh_offset ));
2860 IF_DEBUG(linker,debugBelch(" (%p .. %p) ",
2861 ehdrC + shdr[i].sh_offset,
2862 ehdrC + shdr[i].sh_offset + shdr[i].sh_size - 1));
2864 if (shdr[i].sh_type == SHT_REL) {
2865 IF_DEBUG(linker,debugBelch("Rel " ));
2866 } else if (shdr[i].sh_type == SHT_RELA) {
2867 IF_DEBUG(linker,debugBelch("RelA " ));
2869 IF_DEBUG(linker,debugBelch(" "));
2872 IF_DEBUG(linker,debugBelch("sname=%s\n", sh_strtab + shdr[i].sh_name ));
2876 IF_DEBUG(linker,debugBelch( "\nString tables" ));
2879 for (i = 0; i < ehdr->e_shnum; i++) {
2880 if (shdr[i].sh_type == SHT_STRTAB
2881 /* Ignore the section header's string table. */
2882 && i != ehdr->e_shstrndx
2883 /* Ignore string tables named .stabstr, as they contain
2885 && 0 != memcmp(".stabstr", sh_strtab + shdr[i].sh_name, 8)
2887 IF_DEBUG(linker,debugBelch(" section %d is a normal string table", i ));
2888 strtab = ehdrC + shdr[i].sh_offset;
2893 errorBelch("%s: no string tables, or too many", oc->fileName);
2898 IF_DEBUG(linker,debugBelch( "\nSymbol tables" ));
2899 for (i = 0; i < ehdr->e_shnum; i++) {
2900 if (shdr[i].sh_type != SHT_SYMTAB) continue;
2901 IF_DEBUG(linker,debugBelch( "section %d is a symbol table\n", i ));
2903 stab = (Elf_Sym*) (ehdrC + shdr[i].sh_offset);
2904 nent = shdr[i].sh_size / sizeof(Elf_Sym);
2905 IF_DEBUG(linker,debugBelch( " number of entries is apparently %d (%ld rem)\n",
2907 (long)shdr[i].sh_size % sizeof(Elf_Sym)
2909 if (0 != shdr[i].sh_size % sizeof(Elf_Sym)) {
2910 errorBelch("%s: non-integral number of symbol table entries", oc->fileName);
2913 for (j = 0; j < nent; j++) {
2914 IF_DEBUG(linker,debugBelch(" %2d ", j ));
2915 IF_DEBUG(linker,debugBelch(" sec=%-5d size=%-3d val=%5p ",
2916 (int)stab[j].st_shndx,
2917 (int)stab[j].st_size,
2918 (char*)stab[j].st_value ));
2920 IF_DEBUG(linker,debugBelch("type=" ));
2921 switch (ELF_ST_TYPE(stab[j].st_info)) {
2922 case STT_NOTYPE: IF_DEBUG(linker,debugBelch("notype " )); break;
2923 case STT_OBJECT: IF_DEBUG(linker,debugBelch("object " )); break;
2924 case STT_FUNC : IF_DEBUG(linker,debugBelch("func " )); break;
2925 case STT_SECTION: IF_DEBUG(linker,debugBelch("section" )); break;
2926 case STT_FILE: IF_DEBUG(linker,debugBelch("file " )); break;
2927 default: IF_DEBUG(linker,debugBelch("? " )); break;
2929 IF_DEBUG(linker,debugBelch(" " ));
2931 IF_DEBUG(linker,debugBelch("bind=" ));
2932 switch (ELF_ST_BIND(stab[j].st_info)) {
2933 case STB_LOCAL : IF_DEBUG(linker,debugBelch("local " )); break;
2934 case STB_GLOBAL: IF_DEBUG(linker,debugBelch("global" )); break;
2935 case STB_WEAK : IF_DEBUG(linker,debugBelch("weak " )); break;
2936 default: IF_DEBUG(linker,debugBelch("? " )); break;
2938 IF_DEBUG(linker,debugBelch(" " ));
2940 IF_DEBUG(linker,debugBelch("name=%s\n", strtab + stab[j].st_name ));
2944 if (nsymtabs == 0) {
2945 errorBelch("%s: didn't find any symbol tables", oc->fileName);
2952 static int getSectionKind_ELF( Elf_Shdr *hdr, int *is_bss )
2956 if (hdr->sh_type == SHT_PROGBITS
2957 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_EXECINSTR)) {
2958 /* .text-style section */
2959 return SECTIONKIND_CODE_OR_RODATA;
2962 if (hdr->sh_type == SHT_PROGBITS
2963 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_WRITE)) {
2964 /* .data-style section */
2965 return SECTIONKIND_RWDATA;
2968 if (hdr->sh_type == SHT_PROGBITS
2969 && (hdr->sh_flags & SHF_ALLOC) && !(hdr->sh_flags & SHF_WRITE)) {
2970 /* .rodata-style section */
2971 return SECTIONKIND_CODE_OR_RODATA;
2974 if (hdr->sh_type == SHT_NOBITS
2975 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_WRITE)) {
2976 /* .bss-style section */
2978 return SECTIONKIND_RWDATA;
2981 return SECTIONKIND_OTHER;
2986 ocGetNames_ELF ( ObjectCode* oc )
2991 char* ehdrC = (char*)(oc->image);
2992 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2993 char* strtab = findElfSection ( ehdrC, SHT_STRTAB );
2994 Elf_Shdr* shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
2996 ASSERT(symhash != NULL);
2999 errorBelch("%s: no strtab", oc->fileName);
3004 for (i = 0; i < ehdr->e_shnum; i++) {
3005 /* Figure out what kind of section it is. Logic derived from
3006 Figure 1.14 ("Special Sections") of the ELF document
3007 ("Portable Formats Specification, Version 1.1"). */
3009 SectionKind kind = getSectionKind_ELF(&shdr[i], &is_bss);
3011 if (is_bss && shdr[i].sh_size > 0) {
3012 /* This is a non-empty .bss section. Allocate zeroed space for
3013 it, and set its .sh_offset field such that
3014 ehdrC + .sh_offset == addr_of_zeroed_space. */
3015 char* zspace = stgCallocBytes(1, shdr[i].sh_size,
3016 "ocGetNames_ELF(BSS)");
3017 shdr[i].sh_offset = ((char*)zspace) - ((char*)ehdrC);
3019 debugBelch("BSS section at 0x%x, size %d\n",
3020 zspace, shdr[i].sh_size);
3024 /* fill in the section info */
3025 if (kind != SECTIONKIND_OTHER && shdr[i].sh_size > 0) {
3026 addProddableBlock(oc, ehdrC + shdr[i].sh_offset, shdr[i].sh_size);
3027 addSection(oc, kind, ehdrC + shdr[i].sh_offset,
3028 ehdrC + shdr[i].sh_offset + shdr[i].sh_size - 1);
3031 if (shdr[i].sh_type != SHT_SYMTAB) continue;
3033 /* copy stuff into this module's object symbol table */
3034 stab = (Elf_Sym*) (ehdrC + shdr[i].sh_offset);
3035 nent = shdr[i].sh_size / sizeof(Elf_Sym);
3037 oc->n_symbols = nent;
3038 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
3039 "ocGetNames_ELF(oc->symbols)");
3041 for (j = 0; j < nent; j++) {
3043 char isLocal = FALSE; /* avoids uninit-var warning */
3045 char* nm = strtab + stab[j].st_name;
3046 int secno = stab[j].st_shndx;
3048 /* Figure out if we want to add it; if so, set ad to its
3049 address. Otherwise leave ad == NULL. */
3051 if (secno == SHN_COMMON) {
3053 ad = stgCallocBytes(1, stab[j].st_size, "ocGetNames_ELF(COMMON)");
3055 debugBelch("COMMON symbol, size %d name %s\n",
3056 stab[j].st_size, nm);
3058 /* Pointless to do addProddableBlock() for this area,
3059 since the linker should never poke around in it. */
3062 if ( ( ELF_ST_BIND(stab[j].st_info)==STB_GLOBAL
3063 || ELF_ST_BIND(stab[j].st_info)==STB_LOCAL
3065 /* and not an undefined symbol */
3066 && stab[j].st_shndx != SHN_UNDEF
3067 /* and not in a "special section" */
3068 && stab[j].st_shndx < SHN_LORESERVE
3070 /* and it's a not a section or string table or anything silly */
3071 ( ELF_ST_TYPE(stab[j].st_info)==STT_FUNC ||
3072 ELF_ST_TYPE(stab[j].st_info)==STT_OBJECT ||
3073 ELF_ST_TYPE(stab[j].st_info)==STT_NOTYPE
3076 /* Section 0 is the undefined section, hence > and not >=. */
3077 ASSERT(secno > 0 && secno < ehdr->e_shnum);
3079 if (shdr[secno].sh_type == SHT_NOBITS) {
3080 debugBelch(" BSS symbol, size %d off %d name %s\n",
3081 stab[j].st_size, stab[j].st_value, nm);
3084 ad = ehdrC + shdr[ secno ].sh_offset + stab[j].st_value;
3085 if (ELF_ST_BIND(stab[j].st_info)==STB_LOCAL) {
3088 #ifdef ELF_FUNCTION_DESC
3089 /* dlsym() and the initialisation table both give us function
3090 * descriptors, so to be consistent we store function descriptors
3091 * in the symbol table */
3092 if (ELF_ST_TYPE(stab[j].st_info) == STT_FUNC)
3093 ad = (char *)allocateFunctionDesc((Elf_Addr)ad);
3095 IF_DEBUG(linker,debugBelch( "addOTabName(GLOB): %10p %s %s",
3096 ad, oc->fileName, nm ));
3101 /* And the decision is ... */
3105 oc->symbols[j] = nm;
3108 /* Ignore entirely. */
3110 ghciInsertStrHashTable(oc->fileName, symhash, nm, ad);
3114 IF_DEBUG(linker,debugBelch( "skipping `%s'\n",
3115 strtab + stab[j].st_name ));
3118 "skipping bind = %d, type = %d, shndx = %d `%s'\n",
3119 (int)ELF_ST_BIND(stab[j].st_info),
3120 (int)ELF_ST_TYPE(stab[j].st_info),
3121 (int)stab[j].st_shndx,
3122 strtab + stab[j].st_name
3125 oc->symbols[j] = NULL;
3134 /* Do ELF relocations which lack an explicit addend. All x86-linux
3135 relocations appear to be of this form. */
3137 do_Elf_Rel_relocations ( ObjectCode* oc, char* ehdrC,
3138 Elf_Shdr* shdr, int shnum,
3139 Elf_Sym* stab, char* strtab )
3144 Elf_Rel* rtab = (Elf_Rel*) (ehdrC + shdr[shnum].sh_offset);
3145 int nent = shdr[shnum].sh_size / sizeof(Elf_Rel);
3146 int target_shndx = shdr[shnum].sh_info;
3147 int symtab_shndx = shdr[shnum].sh_link;
3149 stab = (Elf_Sym*) (ehdrC + shdr[ symtab_shndx ].sh_offset);
3150 targ = (Elf_Word*)(ehdrC + shdr[ target_shndx ].sh_offset);
3151 IF_DEBUG(linker,debugBelch( "relocations for section %d using symtab %d\n",
3152 target_shndx, symtab_shndx ));
3154 /* Skip sections that we're not interested in. */
3157 SectionKind kind = getSectionKind_ELF(&shdr[target_shndx], &is_bss);
3158 if (kind == SECTIONKIND_OTHER) {
3159 IF_DEBUG(linker,debugBelch( "skipping (target section not loaded)"));
3164 for (j = 0; j < nent; j++) {
3165 Elf_Addr offset = rtab[j].r_offset;
3166 Elf_Addr info = rtab[j].r_info;
3168 Elf_Addr P = ((Elf_Addr)targ) + offset;
3169 Elf_Word* pP = (Elf_Word*)P;
3174 StgStablePtr stablePtr;
3177 IF_DEBUG(linker,debugBelch( "Rel entry %3d is raw(%6p %6p)",
3178 j, (void*)offset, (void*)info ));
3180 IF_DEBUG(linker,debugBelch( " ZERO" ));
3183 Elf_Sym sym = stab[ELF_R_SYM(info)];
3184 /* First see if it is a local symbol. */
3185 if (ELF_ST_BIND(sym.st_info) == STB_LOCAL) {
3186 /* Yes, so we can get the address directly from the ELF symbol
3188 symbol = sym.st_name==0 ? "(noname)" : strtab+sym.st_name;
3190 (ehdrC + shdr[ sym.st_shndx ].sh_offset
3191 + stab[ELF_R_SYM(info)].st_value);
3194 symbol = strtab + sym.st_name;
3195 stablePtr = (StgStablePtr)lookupHashTable(stablehash, (StgWord)symbol);
3196 if (NULL == stablePtr) {
3197 /* No, so look up the name in our global table. */
3198 S_tmp = lookupSymbol( symbol );
3199 S = (Elf_Addr)S_tmp;
3201 stableVal = deRefStablePtr( stablePtr );
3203 S = (Elf_Addr)S_tmp;
3207 errorBelch("%s: unknown symbol `%s'", oc->fileName, symbol);
3210 IF_DEBUG(linker,debugBelch( "`%s' resolves to %p\n", symbol, (void*)S ));
3213 IF_DEBUG(linker,debugBelch( "Reloc: P = %p S = %p A = %p\n",
3214 (void*)P, (void*)S, (void*)A ));
3215 checkProddableBlock ( oc, pP );
3219 switch (ELF_R_TYPE(info)) {
3220 # ifdef i386_HOST_ARCH
3221 case R_386_32: *pP = value; break;
3222 case R_386_PC32: *pP = value - P; break;
3225 errorBelch("%s: unhandled ELF relocation(Rel) type %lu\n",
3226 oc->fileName, (lnat)ELF_R_TYPE(info));
3234 /* Do ELF relocations for which explicit addends are supplied.
3235 sparc-solaris relocations appear to be of this form. */
3237 do_Elf_Rela_relocations ( ObjectCode* oc, char* ehdrC,
3238 Elf_Shdr* shdr, int shnum,
3239 Elf_Sym* stab, char* strtab )
3242 char *symbol = NULL;
3244 Elf_Rela* rtab = (Elf_Rela*) (ehdrC + shdr[shnum].sh_offset);
3245 int nent = shdr[shnum].sh_size / sizeof(Elf_Rela);
3246 int target_shndx = shdr[shnum].sh_info;
3247 int symtab_shndx = shdr[shnum].sh_link;
3249 stab = (Elf_Sym*) (ehdrC + shdr[ symtab_shndx ].sh_offset);
3250 targ = (Elf_Addr) (ehdrC + shdr[ target_shndx ].sh_offset);
3251 IF_DEBUG(linker,debugBelch( "relocations for section %d using symtab %d\n",
3252 target_shndx, symtab_shndx ));
3254 for (j = 0; j < nent; j++) {
3255 #if defined(DEBUG) || defined(sparc_HOST_ARCH) || defined(ia64_HOST_ARCH) || defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH)
3256 /* This #ifdef only serves to avoid unused-var warnings. */
3257 Elf_Addr offset = rtab[j].r_offset;
3258 Elf_Addr P = targ + offset;
3260 Elf_Addr info = rtab[j].r_info;
3261 Elf_Addr A = rtab[j].r_addend;
3265 # if defined(sparc_HOST_ARCH)
3266 Elf_Word* pP = (Elf_Word*)P;
3268 # elif defined(ia64_HOST_ARCH)
3269 Elf64_Xword *pP = (Elf64_Xword *)P;
3271 # elif defined(powerpc_HOST_ARCH)
3275 IF_DEBUG(linker,debugBelch( "Rel entry %3d is raw(%6p %6p %6p) ",
3276 j, (void*)offset, (void*)info,
3279 IF_DEBUG(linker,debugBelch( " ZERO" ));
3282 Elf_Sym sym = stab[ELF_R_SYM(info)];
3283 /* First see if it is a local symbol. */
3284 if (ELF_ST_BIND(sym.st_info) == STB_LOCAL) {
3285 /* Yes, so we can get the address directly from the ELF symbol
3287 symbol = sym.st_name==0 ? "(noname)" : strtab+sym.st_name;
3289 (ehdrC + shdr[ sym.st_shndx ].sh_offset
3290 + stab[ELF_R_SYM(info)].st_value);
3291 #ifdef ELF_FUNCTION_DESC
3292 /* Make a function descriptor for this function */
3293 if (S && ELF_ST_TYPE(sym.st_info) == STT_FUNC) {
3294 S = allocateFunctionDesc(S + A);
3299 /* No, so look up the name in our global table. */
3300 symbol = strtab + sym.st_name;
3301 S_tmp = lookupSymbol( symbol );
3302 S = (Elf_Addr)S_tmp;
3304 #ifdef ELF_FUNCTION_DESC
3305 /* If a function, already a function descriptor - we would
3306 have to copy it to add an offset. */
3307 if (S && (ELF_ST_TYPE(sym.st_info) == STT_FUNC) && (A != 0))
3308 errorBelch("%s: function %s with addend %p", oc->fileName, symbol, (void *)A);
3312 errorBelch("%s: unknown symbol `%s'", oc->fileName, symbol);
3315 IF_DEBUG(linker,debugBelch( "`%s' resolves to %p", symbol, (void*)S ));
3318 IF_DEBUG(linker,debugBelch("Reloc: P = %p S = %p A = %p\n",
3319 (void*)P, (void*)S, (void*)A ));
3320 /* checkProddableBlock ( oc, (void*)P ); */
3324 switch (ELF_R_TYPE(info)) {
3325 # if defined(sparc_HOST_ARCH)
3326 case R_SPARC_WDISP30:
3327 w1 = *pP & 0xC0000000;
3328 w2 = (Elf_Word)((value - P) >> 2);
3329 ASSERT((w2 & 0xC0000000) == 0);
3334 w1 = *pP & 0xFFC00000;
3335 w2 = (Elf_Word)(value >> 10);
3336 ASSERT((w2 & 0xFFC00000) == 0);
3342 w2 = (Elf_Word)(value & 0x3FF);
3343 ASSERT((w2 & ~0x3FF) == 0);
3347 /* According to the Sun documentation:
3349 This relocation type resembles R_SPARC_32, except it refers to an
3350 unaligned word. That is, the word to be relocated must be treated
3351 as four separate bytes with arbitrary alignment, not as a word
3352 aligned according to the architecture requirements.
3354 (JRS: which means that freeloading on the R_SPARC_32 case
3355 is probably wrong, but hey ...)
3359 w2 = (Elf_Word)value;
3362 # elif defined(ia64_HOST_ARCH)
3363 case R_IA64_DIR64LSB:
3364 case R_IA64_FPTR64LSB:
3367 case R_IA64_PCREL64LSB:
3370 case R_IA64_SEGREL64LSB:
3371 addr = findElfSegment(ehdrC, value);
3374 case R_IA64_GPREL22:
3375 ia64_reloc_gprel22(P, value);
3377 case R_IA64_LTOFF22:
3378 case R_IA64_LTOFF22X:
3379 case R_IA64_LTOFF_FPTR22:
3380 addr = allocateGOTEntry(value);
3381 ia64_reloc_gprel22(P, addr);
3383 case R_IA64_PCREL21B:
3384 ia64_reloc_pcrel21(P, S, oc);
3387 /* This goes with R_IA64_LTOFF22X and points to the load to
3388 * convert into a move. We don't implement relaxation. */
3390 # elif defined(powerpc_HOST_ARCH)
3391 case R_PPC_ADDR16_LO:
3392 *(Elf32_Half*) P = value;
3395 case R_PPC_ADDR16_HI:
3396 *(Elf32_Half*) P = value >> 16;
3399 case R_PPC_ADDR16_HA:
3400 *(Elf32_Half*) P = (value + 0x8000) >> 16;
3404 *(Elf32_Word *) P = value;
3408 *(Elf32_Word *) P = value - P;
3414 if( delta << 6 >> 6 != delta )
3416 value = makeJumpIsland( oc, ELF_R_SYM(info), value );
3419 if( value == 0 || delta << 6 >> 6 != delta )
3421 barf( "Unable to make ppcJumpIsland for #%d",
3427 *(Elf_Word *) P = (*(Elf_Word *) P & 0xfc000003)
3428 | (delta & 0x3fffffc);
3432 #if x86_64_HOST_ARCH
3434 *(Elf64_Xword *)P = value;
3439 StgInt64 off = value - P;
3440 if (off >= 0x7fffffffL || off < -0x80000000L) {
3441 barf("R_X86_64_PC32 relocation out of range: %s = %p",
3444 *(Elf64_Word *)P = (Elf64_Word)off;
3449 if (value >= 0x7fffffffL) {
3450 barf("R_X86_64_32 relocation out of range: %s = %p\n",
3453 *(Elf64_Word *)P = (Elf64_Word)value;
3457 if ((StgInt64)value > 0x7fffffffL || (StgInt64)value < -0x80000000L) {
3458 barf("R_X86_64_32S relocation out of range: %s = %p\n",
3461 *(Elf64_Sword *)P = (Elf64_Sword)value;
3466 errorBelch("%s: unhandled ELF relocation(RelA) type %lu\n",
3467 oc->fileName, (lnat)ELF_R_TYPE(info));
3476 ocResolve_ELF ( ObjectCode* oc )
3480 Elf_Sym* stab = NULL;
3481 char* ehdrC = (char*)(oc->image);
3482 Elf_Ehdr* ehdr = (Elf_Ehdr*) ehdrC;
3483 Elf_Shdr* shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
3485 /* first find "the" symbol table */
3486 stab = (Elf_Sym*) findElfSection ( ehdrC, SHT_SYMTAB );
3488 /* also go find the string table */
3489 strtab = findElfSection ( ehdrC, SHT_STRTAB );
3491 if (stab == NULL || strtab == NULL) {
3492 errorBelch("%s: can't find string or symbol table", oc->fileName);
3496 /* Process the relocation sections. */
3497 for (shnum = 0; shnum < ehdr->e_shnum; shnum++) {
3498 if (shdr[shnum].sh_type == SHT_REL) {
3499 ok = do_Elf_Rel_relocations ( oc, ehdrC, shdr,
3500 shnum, stab, strtab );
3504 if (shdr[shnum].sh_type == SHT_RELA) {
3505 ok = do_Elf_Rela_relocations ( oc, ehdrC, shdr,
3506 shnum, stab, strtab );
3511 /* Free the local symbol table; we won't need it again. */
3512 freeHashTable(oc->lochash, NULL);
3515 #if defined(powerpc_HOST_ARCH)
3516 ocFlushInstructionCache( oc );
3524 * Instructions are 41 bits long, packed into 128 bit bundles with a 5-bit template
3525 * at the front. The following utility functions pack and unpack instructions, and
3526 * take care of the most common relocations.
3529 #ifdef ia64_HOST_ARCH
3532 ia64_extract_instruction(Elf64_Xword *target)
3535 int slot = (Elf_Addr)target & 3;
3536 target = (Elf_Addr)target & ~3;
3544 return ((w1 >> 5) & 0x1ffffffffff);
3546 return (w1 >> 46) | ((w2 & 0x7fffff) << 18);
3550 barf("ia64_extract_instruction: invalid slot %p", target);
3555 ia64_deposit_instruction(Elf64_Xword *target, Elf64_Xword value)
3557 int slot = (Elf_Addr)target & 3;
3558 target = (Elf_Addr)target & ~3;
3563 *target |= value << 5;
3566 *target |= value << 46;
3567 *(target+1) |= value >> 18;
3570 *(target+1) |= value << 23;
3576 ia64_reloc_gprel22(Elf_Addr target, Elf_Addr value)
3578 Elf64_Xword instruction;
3579 Elf64_Sxword rel_value;
3581 rel_value = value - gp_val;
3582 if ((rel_value > 0x1fffff) || (rel_value < -0x1fffff))
3583 barf("GP-relative data out of range (address = 0x%lx, gp = 0x%lx)", value, gp_val);
3585 instruction = ia64_extract_instruction((Elf64_Xword *)target);
3586 instruction |= (((rel_value >> 0) & 0x07f) << 13) /* imm7b */
3587 | (((rel_value >> 7) & 0x1ff) << 27) /* imm9d */
3588 | (((rel_value >> 16) & 0x01f) << 22) /* imm5c */
3589 | ((Elf64_Xword)(rel_value < 0) << 36); /* s */
3590 ia64_deposit_instruction((Elf64_Xword *)target, instruction);
3594 ia64_reloc_pcrel21(Elf_Addr target, Elf_Addr value, ObjectCode *oc)
3596 Elf64_Xword instruction;
3597 Elf64_Sxword rel_value;
3600 entry = allocatePLTEntry(value, oc);
3602 rel_value = (entry >> 4) - (target >> 4);
3603 if ((rel_value > 0xfffff) || (rel_value < -0xfffff))
3604 barf("PLT entry too far away (entry = 0x%lx, target = 0x%lx)", entry, target);
3606 instruction = ia64_extract_instruction((Elf64_Xword *)target);
3607 instruction |= ((rel_value & 0xfffff) << 13) /* imm20b */
3608 | ((Elf64_Xword)(rel_value < 0) << 36); /* s */
3609 ia64_deposit_instruction((Elf64_Xword *)target, instruction);
3615 * PowerPC ELF specifics
3618 #ifdef powerpc_HOST_ARCH
3620 static int ocAllocateJumpIslands_ELF( ObjectCode *oc )
3626 ehdr = (Elf_Ehdr *) oc->image;
3627 shdr = (Elf_Shdr *) ( ((char *)oc->image) + ehdr->e_shoff );
3629 for( i = 0; i < ehdr->e_shnum; i++ )
3630 if( shdr[i].sh_type == SHT_SYMTAB )
3633 if( i == ehdr->e_shnum )
3635 errorBelch( "This ELF file contains no symtab" );
3639 if( shdr[i].sh_entsize != sizeof( Elf_Sym ) )
3641 errorBelch( "The entry size (%d) of the symtab isn't %d\n",
3642 shdr[i].sh_entsize, sizeof( Elf_Sym ) );
3647 return ocAllocateJumpIslands( oc, shdr[i].sh_size / sizeof( Elf_Sym ), 0 );
3650 #endif /* powerpc */
3654 /* --------------------------------------------------------------------------
3656 * ------------------------------------------------------------------------*/
3658 #if defined(OBJFORMAT_MACHO)
3661 Support for MachO linking on Darwin/MacOS X
3662 by Wolfgang Thaller (wolfgang.thaller@gmx.net)
3664 I hereby formally apologize for the hackish nature of this code.
3665 Things that need to be done:
3666 *) implement ocVerifyImage_MachO
3667 *) add still more sanity checks.
3670 #ifdef powerpc_HOST_ARCH
3671 static int ocAllocateJumpIslands_MachO(ObjectCode* oc)
3673 struct mach_header *header = (struct mach_header *) oc->image;
3674 struct load_command *lc = (struct load_command *) (header + 1);
3677 for( i = 0; i < header->ncmds; i++ )
3679 if( lc->cmd == LC_SYMTAB )
3681 // Find out the first and last undefined external
3682 // symbol, so we don't have to allocate too many
3684 struct symtab_command *symLC = (struct symtab_command *) lc;
3685 unsigned min = symLC->nsyms, max = 0;
3686 struct nlist *nlist =
3687 symLC ? (struct nlist*) ((char*) oc->image + symLC->symoff)
3689 for(i=0;i<symLC->nsyms;i++)
3691 if(nlist[i].n_type & N_STAB)
3693 else if(nlist[i].n_type & N_EXT)
3695 if((nlist[i].n_type & N_TYPE) == N_UNDF
3696 && (nlist[i].n_value == 0))
3706 return ocAllocateJumpIslands(oc, max - min + 1, min);
3711 lc = (struct load_command *) ( ((char *)lc) + lc->cmdsize );
3713 return ocAllocateJumpIslands(oc,0,0);
3717 static int ocVerifyImage_MachO(ObjectCode* oc STG_UNUSED)
3719 // FIXME: do some verifying here
3723 static int resolveImports(
3726 struct symtab_command *symLC,
3727 struct section *sect, // ptr to lazy or non-lazy symbol pointer section
3728 unsigned long *indirectSyms,
3729 struct nlist *nlist)
3732 size_t itemSize = 4;
3735 int isJumpTable = 0;
3736 if(!strcmp(sect->sectname,"__jump_table"))
3740 ASSERT(sect->reserved2 == itemSize);
3744 for(i=0; i*itemSize < sect->size;i++)
3746 // according to otool, reserved1 contains the first index into the indirect symbol table
3747 struct nlist *symbol = &nlist[indirectSyms[sect->reserved1+i]];
3748 char *nm = image + symLC->stroff + symbol->n_un.n_strx;
3751 if((symbol->n_type & N_TYPE) == N_UNDF
3752 && (symbol->n_type & N_EXT) && (symbol->n_value != 0))
3753 addr = (void*) (symbol->n_value);
3754 else if((addr = lookupLocalSymbol(oc,nm)) != NULL)
3757 addr = lookupSymbol(nm);
3760 errorBelch("\n%s: unknown symbol `%s'", oc->fileName, nm);
3768 checkProddableBlock(oc,image + sect->offset + i*itemSize);
3769 *(image + sect->offset + i*itemSize) = 0xe9; // jmp
3770 *(unsigned*)(image + sect->offset + i*itemSize + 1)
3771 = (char*)addr - (image + sect->offset + i*itemSize + 5);
3776 checkProddableBlock(oc,((void**)(image + sect->offset)) + i);
3777 ((void**)(image + sect->offset))[i] = addr;
3784 static unsigned long relocateAddress(
3787 struct section* sections,
3788 unsigned long address)
3791 for(i = 0; i < nSections; i++)
3793 if(sections[i].addr <= address
3794 && address < sections[i].addr + sections[i].size)
3796 return (unsigned long)oc->image
3797 + sections[i].offset + address - sections[i].addr;
3800 barf("Invalid Mach-O file:"
3801 "Address out of bounds while relocating object file");
3805 static int relocateSection(
3808 struct symtab_command *symLC, struct nlist *nlist,
3809 int nSections, struct section* sections, struct section *sect)
3811 struct relocation_info *relocs;
3814 if(!strcmp(sect->sectname,"__la_symbol_ptr"))
3816 else if(!strcmp(sect->sectname,"__nl_symbol_ptr"))
3818 else if(!strcmp(sect->sectname,"__la_sym_ptr2"))
3820 else if(!strcmp(sect->sectname,"__la_sym_ptr3"))
3824 relocs = (struct relocation_info*) (image + sect->reloff);
3828 if(relocs[i].r_address & R_SCATTERED)
3830 struct scattered_relocation_info *scat =
3831 (struct scattered_relocation_info*) &relocs[i];
3835 if(scat->r_length == 2)
3837 unsigned long word = 0;
3838 unsigned long* wordPtr = (unsigned long*) (image + sect->offset + scat->r_address);
3839 checkProddableBlock(oc,wordPtr);
3841 // Note on relocation types:
3842 // i386 uses the GENERIC_RELOC_* types,
3843 // while ppc uses special PPC_RELOC_* types.
3844 // *_RELOC_VANILLA and *_RELOC_PAIR have the same value
3845 // in both cases, all others are different.
3846 // Therefore, we use GENERIC_RELOC_VANILLA
3847 // and GENERIC_RELOC_PAIR instead of the PPC variants,
3848 // and use #ifdefs for the other types.
3850 // Step 1: Figure out what the relocated value should be
3851 if(scat->r_type == GENERIC_RELOC_VANILLA)
3853 word = *wordPtr + (unsigned long) relocateAddress(
3860 #ifdef powerpc_HOST_ARCH
3861 else if(scat->r_type == PPC_RELOC_SECTDIFF
3862 || scat->r_type == PPC_RELOC_LO16_SECTDIFF
3863 || scat->r_type == PPC_RELOC_HI16_SECTDIFF
3864 || scat->r_type == PPC_RELOC_HA16_SECTDIFF)
3866 else if(scat->r_type == GENERIC_RELOC_SECTDIFF)
3869 struct scattered_relocation_info *pair =
3870 (struct scattered_relocation_info*) &relocs[i+1];
3872 if(!pair->r_scattered || pair->r_type != GENERIC_RELOC_PAIR)
3873 barf("Invalid Mach-O file: "
3874 "RELOC_*_SECTDIFF not followed by RELOC_PAIR");
3876 word = (unsigned long)
3877 (relocateAddress(oc, nSections, sections, scat->r_value)
3878 - relocateAddress(oc, nSections, sections, pair->r_value));
3881 #ifdef powerpc_HOST_ARCH
3882 else if(scat->r_type == PPC_RELOC_HI16
3883 || scat->r_type == PPC_RELOC_LO16
3884 || scat->r_type == PPC_RELOC_HA16
3885 || scat->r_type == PPC_RELOC_LO14)
3886 { // these are generated by label+offset things
3887 struct relocation_info *pair = &relocs[i+1];
3888 if((pair->r_address & R_SCATTERED) || pair->r_type != PPC_RELOC_PAIR)
3889 barf("Invalid Mach-O file: "
3890 "PPC_RELOC_* not followed by PPC_RELOC_PAIR");
3892 if(scat->r_type == PPC_RELOC_LO16)
3894 word = ((unsigned short*) wordPtr)[1];
3895 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
3897 else if(scat->r_type == PPC_RELOC_LO14)
3899 barf("Unsupported Relocation: PPC_RELOC_LO14");
3900 word = ((unsigned short*) wordPtr)[1] & 0xFFFC;
3901 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
3903 else if(scat->r_type == PPC_RELOC_HI16)
3905 word = ((unsigned short*) wordPtr)[1] << 16;
3906 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF);
3908 else if(scat->r_type == PPC_RELOC_HA16)
3910 word = ((unsigned short*) wordPtr)[1] << 16;
3911 word += ((short)relocs[i+1].r_address & (short)0xFFFF);
3915 word += (unsigned long) relocateAddress(oc, nSections, sections, scat->r_value)
3922 continue; // ignore the others
3924 #ifdef powerpc_HOST_ARCH
3925 if(scat->r_type == GENERIC_RELOC_VANILLA
3926 || scat->r_type == PPC_RELOC_SECTDIFF)
3928 if(scat->r_type == GENERIC_RELOC_VANILLA
3929 || scat->r_type == GENERIC_RELOC_SECTDIFF)
3934 #ifdef powerpc_HOST_ARCH
3935 else if(scat->r_type == PPC_RELOC_LO16_SECTDIFF || scat->r_type == PPC_RELOC_LO16)
3937 ((unsigned short*) wordPtr)[1] = word & 0xFFFF;
3939 else if(scat->r_type == PPC_RELOC_HI16_SECTDIFF || scat->r_type == PPC_RELOC_HI16)
3941 ((unsigned short*) wordPtr)[1] = (word >> 16) & 0xFFFF;
3943 else if(scat->r_type == PPC_RELOC_HA16_SECTDIFF || scat->r_type == PPC_RELOC_HA16)
3945 ((unsigned short*) wordPtr)[1] = ((word >> 16) & 0xFFFF)
3946 + ((word & (1<<15)) ? 1 : 0);
3952 continue; // FIXME: I hope it's OK to ignore all the others.
3956 struct relocation_info *reloc = &relocs[i];
3957 if(reloc->r_pcrel && !reloc->r_extern)
3960 if(reloc->r_length == 2)
3962 unsigned long word = 0;
3963 #ifdef powerpc_HOST_ARCH
3964 unsigned long jumpIsland = 0;
3965 long offsetToJumpIsland = 0xBADBAD42; // initialise to bad value
3966 // to avoid warning and to catch
3970 unsigned long* wordPtr = (unsigned long*) (image + sect->offset + reloc->r_address);
3971 checkProddableBlock(oc,wordPtr);
3973 if(reloc->r_type == GENERIC_RELOC_VANILLA)
3977 #ifdef powerpc_HOST_ARCH
3978 else if(reloc->r_type == PPC_RELOC_LO16)
3980 word = ((unsigned short*) wordPtr)[1];
3981 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
3983 else if(reloc->r_type == PPC_RELOC_HI16)
3985 word = ((unsigned short*) wordPtr)[1] << 16;
3986 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF);
3988 else if(reloc->r_type == PPC_RELOC_HA16)
3990 word = ((unsigned short*) wordPtr)[1] << 16;
3991 word += ((short)relocs[i+1].r_address & (short)0xFFFF);
3993 else if(reloc->r_type == PPC_RELOC_BR24)
3996 word = (word & 0x03FFFFFC) | ((word & 0x02000000) ? 0xFC000000 : 0);
4000 if(!reloc->r_extern)
4003 sections[reloc->r_symbolnum-1].offset
4004 - sections[reloc->r_symbolnum-1].addr
4011 struct nlist *symbol = &nlist[reloc->r_symbolnum];
4012 char *nm = image + symLC->stroff + symbol->n_un.n_strx;
4013 void *symbolAddress = lookupSymbol(nm);
4016 errorBelch("\nunknown symbol `%s'", nm);
4022 #ifdef powerpc_HOST_ARCH
4023 // In the .o file, this should be a relative jump to NULL
4024 // and we'll change it to a relative jump to the symbol
4025 ASSERT(-word == reloc->r_address);
4026 jumpIsland = makeJumpIsland(oc,reloc->r_symbolnum,(unsigned long) symbolAddress);
4029 offsetToJumpIsland = word + jumpIsland
4030 - (((long)image) + sect->offset - sect->addr);
4033 word += (unsigned long) symbolAddress
4034 - (((long)image) + sect->offset - sect->addr);
4038 word += (unsigned long) symbolAddress;
4042 if(reloc->r_type == GENERIC_RELOC_VANILLA)
4047 #ifdef powerpc_HOST_ARCH
4048 else if(reloc->r_type == PPC_RELOC_LO16)
4050 ((unsigned short*) wordPtr)[1] = word & 0xFFFF;
4053 else if(reloc->r_type == PPC_RELOC_HI16)
4055 ((unsigned short*) wordPtr)[1] = (word >> 16) & 0xFFFF;
4058 else if(reloc->r_type == PPC_RELOC_HA16)
4060 ((unsigned short*) wordPtr)[1] = ((word >> 16) & 0xFFFF)
4061 + ((word & (1<<15)) ? 1 : 0);
4064 else if(reloc->r_type == PPC_RELOC_BR24)
4066 if((long)word > (long)0x01FFFFFF || (long)word < (long)0xFFE00000)
4068 // The branch offset is too large.
4069 // Therefore, we try to use a jump island.
4072 barf("unconditional relative branch out of range: "
4073 "no jump island available");
4076 word = offsetToJumpIsland;
4077 if((long)word > (long)0x01FFFFFF || (long)word < (long)0xFFE00000)
4078 barf("unconditional relative branch out of range: "
4079 "jump island out of range");
4081 *wordPtr = (*wordPtr & 0xFC000003) | (word & 0x03FFFFFC);
4086 barf("\nunknown relocation %d",reloc->r_type);
4093 static int ocGetNames_MachO(ObjectCode* oc)
4095 char *image = (char*) oc->image;
4096 struct mach_header *header = (struct mach_header*) image;
4097 struct load_command *lc = (struct load_command*) (image + sizeof(struct mach_header));
4098 unsigned i,curSymbol = 0;
4099 struct segment_command *segLC = NULL;
4100 struct section *sections;
4101 struct symtab_command *symLC = NULL;
4102 struct nlist *nlist;
4103 unsigned long commonSize = 0;
4104 char *commonStorage = NULL;
4105 unsigned long commonCounter;
4107 for(i=0;i<header->ncmds;i++)
4109 if(lc->cmd == LC_SEGMENT)
4110 segLC = (struct segment_command*) lc;
4111 else if(lc->cmd == LC_SYMTAB)
4112 symLC = (struct symtab_command*) lc;
4113 lc = (struct load_command *) ( ((char*)lc) + lc->cmdsize );
4116 sections = (struct section*) (segLC+1);
4117 nlist = symLC ? (struct nlist*) (image + symLC->symoff)
4120 for(i=0;i<segLC->nsects;i++)
4122 if(sections[i].size == 0)
4125 if((sections[i].flags & SECTION_TYPE) == S_ZEROFILL)
4127 char * zeroFillArea = stgCallocBytes(1,sections[i].size,
4128 "ocGetNames_MachO(common symbols)");
4129 sections[i].offset = zeroFillArea - image;
4132 if(!strcmp(sections[i].sectname,"__text"))
4133 addSection(oc, SECTIONKIND_CODE_OR_RODATA,
4134 (void*) (image + sections[i].offset),
4135 (void*) (image + sections[i].offset + sections[i].size));
4136 else if(!strcmp(sections[i].sectname,"__const"))
4137 addSection(oc, SECTIONKIND_RWDATA,
4138 (void*) (image + sections[i].offset),
4139 (void*) (image + sections[i].offset + sections[i].size));
4140 else if(!strcmp(sections[i].sectname,"__data"))
4141 addSection(oc, SECTIONKIND_RWDATA,
4142 (void*) (image + sections[i].offset),
4143 (void*) (image + sections[i].offset + sections[i].size));
4144 else if(!strcmp(sections[i].sectname,"__bss")
4145 || !strcmp(sections[i].sectname,"__common"))
4146 addSection(oc, SECTIONKIND_RWDATA,
4147 (void*) (image + sections[i].offset),
4148 (void*) (image + sections[i].offset + sections[i].size));
4150 addProddableBlock(oc, (void*) (image + sections[i].offset),
4154 // count external symbols defined here
4158 for(i=0;i<symLC->nsyms;i++)
4160 if(nlist[i].n_type & N_STAB)
4162 else if(nlist[i].n_type & N_EXT)
4164 if((nlist[i].n_type & N_TYPE) == N_UNDF
4165 && (nlist[i].n_value != 0))
4167 commonSize += nlist[i].n_value;
4170 else if((nlist[i].n_type & N_TYPE) == N_SECT)
4175 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
4176 "ocGetNames_MachO(oc->symbols)");
4180 for(i=0;i<symLC->nsyms;i++)
4182 if(nlist[i].n_type & N_STAB)
4184 else if((nlist[i].n_type & N_TYPE) == N_SECT)
4186 if(nlist[i].n_type & N_EXT)
4188 char *nm = image + symLC->stroff + nlist[i].n_un.n_strx;
4189 ghciInsertStrHashTable(oc->fileName, symhash, nm,
4191 + sections[nlist[i].n_sect-1].offset
4192 - sections[nlist[i].n_sect-1].addr
4193 + nlist[i].n_value);
4194 oc->symbols[curSymbol++] = nm;
4198 char *nm = image + symLC->stroff + nlist[i].n_un.n_strx;
4199 ghciInsertStrHashTable(oc->fileName, oc->lochash, nm,
4201 + sections[nlist[i].n_sect-1].offset
4202 - sections[nlist[i].n_sect-1].addr
4203 + nlist[i].n_value);
4209 commonStorage = stgCallocBytes(1,commonSize,"ocGetNames_MachO(common symbols)");
4210 commonCounter = (unsigned long)commonStorage;
4213 for(i=0;i<symLC->nsyms;i++)
4215 if((nlist[i].n_type & N_TYPE) == N_UNDF
4216 && (nlist[i].n_type & N_EXT) && (nlist[i].n_value != 0))
4218 char *nm = image + symLC->stroff + nlist[i].n_un.n_strx;
4219 unsigned long sz = nlist[i].n_value;
4221 nlist[i].n_value = commonCounter;
4223 ghciInsertStrHashTable(oc->fileName, symhash, nm,
4224 (void*)commonCounter);
4225 oc->symbols[curSymbol++] = nm;
4227 commonCounter += sz;
4234 static int ocResolve_MachO(ObjectCode* oc)
4236 char *image = (char*) oc->image;
4237 struct mach_header *header = (struct mach_header*) image;
4238 struct load_command *lc = (struct load_command*) (image + sizeof(struct mach_header));
4240 struct segment_command *segLC = NULL;
4241 struct section *sections;
4242 struct symtab_command *symLC = NULL;
4243 struct dysymtab_command *dsymLC = NULL;
4244 struct nlist *nlist;
4246 for(i=0;i<header->ncmds;i++)
4248 if(lc->cmd == LC_SEGMENT)
4249 segLC = (struct segment_command*) lc;
4250 else if(lc->cmd == LC_SYMTAB)
4251 symLC = (struct symtab_command*) lc;
4252 else if(lc->cmd == LC_DYSYMTAB)
4253 dsymLC = (struct dysymtab_command*) lc;
4254 lc = (struct load_command *) ( ((char*)lc) + lc->cmdsize );
4257 sections = (struct section*) (segLC+1);
4258 nlist = symLC ? (struct nlist*) (image + symLC->symoff)
4263 unsigned long *indirectSyms
4264 = (unsigned long*) (image + dsymLC->indirectsymoff);
4266 for(i=0;i<segLC->nsects;i++)
4268 if( !strcmp(sections[i].sectname,"__la_symbol_ptr")
4269 || !strcmp(sections[i].sectname,"__la_sym_ptr2")
4270 || !strcmp(sections[i].sectname,"__la_sym_ptr3"))
4272 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4275 else if(!strcmp(sections[i].sectname,"__nl_symbol_ptr")
4276 || !strcmp(sections[i].sectname,"__pointers"))
4278 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4281 else if(!strcmp(sections[i].sectname,"__jump_table"))
4283 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4289 for(i=0;i<segLC->nsects;i++)
4291 if(!relocateSection(oc,image,symLC,nlist,segLC->nsects,sections,§ions[i]))
4295 /* Free the local symbol table; we won't need it again. */
4296 freeHashTable(oc->lochash, NULL);
4299 #if defined (powerpc_HOST_ARCH)
4300 ocFlushInstructionCache( oc );
4306 #ifdef powerpc_HOST_ARCH
4308 * The Mach-O object format uses leading underscores. But not everywhere.
4309 * There is a small number of runtime support functions defined in
4310 * libcc_dynamic.a whose name does not have a leading underscore.
4311 * As a consequence, we can't get their address from C code.
4312 * We have to use inline assembler just to take the address of a function.
4316 static void machoInitSymbolsWithoutUnderscore()
4318 extern void* symbolsWithoutUnderscore[];
4319 void **p = symbolsWithoutUnderscore;
4320 __asm__ volatile(".globl _symbolsWithoutUnderscore\n.data\n_symbolsWithoutUnderscore:");
4324 __asm__ volatile(".long " # x);
4326 RTS_MACHO_NOUNDERLINE_SYMBOLS
4328 __asm__ volatile(".text");
4332 ghciInsertStrHashTable("(GHCi built-in symbols)", symhash, #x, *p++);
4334 RTS_MACHO_NOUNDERLINE_SYMBOLS
4341 * Figure out by how much to shift the entire Mach-O file in memory
4342 * when loading so that its single segment ends up 16-byte-aligned
4344 static int machoGetMisalignment( FILE * f )
4346 struct mach_header header;
4349 fread(&header, sizeof(header), 1, f);
4352 if(header.magic != MH_MAGIC)
4355 misalignment = (header.sizeofcmds + sizeof(header))
4358 return misalignment ? (16 - misalignment) : 0;