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) \
461 SymX(MallocFailHook) \
463 SymX(OutOfHeapHook) \
464 SymX(StackOverflowHook) \
465 SymX(__encodeDouble) \
466 SymX(__encodeFloat) \
470 SymX(__gmpz_cmp_si) \
471 SymX(__gmpz_cmp_ui) \
472 SymX(__gmpz_get_si) \
473 SymX(__gmpz_get_ui) \
474 SymX(__int_encodeDouble) \
475 SymX(__int_encodeFloat) \
476 SymX(andIntegerzh_fast) \
477 SymX(atomicallyzh_fast) \
481 SymX(blockAsyncExceptionszh_fast) \
483 SymX(catchRetryzh_fast) \
484 SymX(catchSTMzh_fast) \
486 SymX(closure_flags) \
488 SymX(cmpIntegerzh_fast) \
489 SymX(cmpIntegerIntzh_fast) \
490 SymX(complementIntegerzh_fast) \
491 SymX(createAdjustor) \
492 SymX(decodeDoublezh_fast) \
493 SymX(decodeFloatzh_fast) \
496 SymX(deRefWeakzh_fast) \
497 SymX(deRefStablePtrzh_fast) \
498 SymX(dirty_MUT_VAR) \
499 SymX(divExactIntegerzh_fast) \
500 SymX(divModIntegerzh_fast) \
502 SymX(forkOnzh_fast) \
504 SymX(forkOS_createThread) \
505 SymX(freeHaskellFunctionPtr) \
506 SymX(freeStablePtr) \
507 SymX(getOrSetTypeableStore) \
508 SymX(gcdIntegerzh_fast) \
509 SymX(gcdIntegerIntzh_fast) \
510 SymX(gcdIntzh_fast) \
519 SymX(hs_perform_gc) \
520 SymX(hs_free_stable_ptr) \
521 SymX(hs_free_fun_ptr) \
523 SymX(infoPtrzh_fast) \
524 SymX(closurePayloadzh_fast) \
525 SymX(int2Integerzh_fast) \
526 SymX(integer2Intzh_fast) \
527 SymX(integer2Wordzh_fast) \
528 SymX(isCurrentThreadBoundzh_fast) \
529 SymX(isDoubleDenormalized) \
530 SymX(isDoubleInfinite) \
532 SymX(isDoubleNegativeZero) \
533 SymX(isEmptyMVarzh_fast) \
534 SymX(isFloatDenormalized) \
535 SymX(isFloatInfinite) \
537 SymX(isFloatNegativeZero) \
538 SymX(killThreadzh_fast) \
540 SymX(insertStableSymbol) \
543 SymX(makeStablePtrzh_fast) \
544 SymX(minusIntegerzh_fast) \
545 SymX(mkApUpd0zh_fast) \
546 SymX(myThreadIdzh_fast) \
547 SymX(labelThreadzh_fast) \
548 SymX(newArrayzh_fast) \
549 SymX(newBCOzh_fast) \
550 SymX(newByteArrayzh_fast) \
551 SymX_redirect(newCAF, newDynCAF) \
552 SymX(newMVarzh_fast) \
553 SymX(newMutVarzh_fast) \
554 SymX(newTVarzh_fast) \
555 SymX(noDuplicatezh_fast) \
556 SymX(atomicModifyMutVarzh_fast) \
557 SymX(newPinnedByteArrayzh_fast) \
559 SymX(orIntegerzh_fast) \
561 SymX(performMajorGC) \
562 SymX(plusIntegerzh_fast) \
565 SymX(putMVarzh_fast) \
566 SymX(quotIntegerzh_fast) \
567 SymX(quotRemIntegerzh_fast) \
569 SymX(raiseIOzh_fast) \
570 SymX(readTVarzh_fast) \
571 SymX(remIntegerzh_fast) \
572 SymX(resetNonBlockingFd) \
577 SymX(rts_checkSchedStatus) \
580 SymX(rts_evalLazyIO) \
581 SymX(rts_evalStableIO) \
585 SymX(rts_getDouble) \
590 SymX(rts_getFunPtr) \
591 SymX(rts_getStablePtr) \
592 SymX(rts_getThreadId) \
594 SymX(rts_getWord32) \
607 SymX(rts_mkStablePtr) \
615 SymX(rtsSupportsBoundThreads) \
616 SymX(__hscore_get_saved_termios) \
617 SymX(__hscore_set_saved_termios) \
619 SymX(startupHaskell) \
620 SymX(shutdownHaskell) \
621 SymX(shutdownHaskellAndExit) \
622 SymX(stable_ptr_table) \
623 SymX(stackOverflow) \
624 SymX(stg_CAF_BLACKHOLE_info) \
625 SymX(awakenBlockedQueue) \
626 SymX(stg_CHARLIKE_closure) \
627 SymX(stg_EMPTY_MVAR_info) \
628 SymX(stg_IND_STATIC_info) \
629 SymX(stg_INTLIKE_closure) \
630 SymX(stg_MUT_ARR_PTRS_DIRTY_info) \
631 SymX(stg_MUT_ARR_PTRS_FROZEN_info) \
632 SymX(stg_MUT_ARR_PTRS_FROZEN0_info) \
633 SymX(stg_WEAK_info) \
634 SymX(stg_ap_v_info) \
635 SymX(stg_ap_f_info) \
636 SymX(stg_ap_d_info) \
637 SymX(stg_ap_l_info) \
638 SymX(stg_ap_n_info) \
639 SymX(stg_ap_p_info) \
640 SymX(stg_ap_pv_info) \
641 SymX(stg_ap_pp_info) \
642 SymX(stg_ap_ppv_info) \
643 SymX(stg_ap_ppp_info) \
644 SymX(stg_ap_pppv_info) \
645 SymX(stg_ap_pppp_info) \
646 SymX(stg_ap_ppppp_info) \
647 SymX(stg_ap_pppppp_info) \
648 SymX(stg_ap_0_fast) \
649 SymX(stg_ap_v_fast) \
650 SymX(stg_ap_f_fast) \
651 SymX(stg_ap_d_fast) \
652 SymX(stg_ap_l_fast) \
653 SymX(stg_ap_n_fast) \
654 SymX(stg_ap_p_fast) \
655 SymX(stg_ap_pv_fast) \
656 SymX(stg_ap_pp_fast) \
657 SymX(stg_ap_ppv_fast) \
658 SymX(stg_ap_ppp_fast) \
659 SymX(stg_ap_pppv_fast) \
660 SymX(stg_ap_pppp_fast) \
661 SymX(stg_ap_ppppp_fast) \
662 SymX(stg_ap_pppppp_fast) \
663 SymX(stg_ap_1_upd_info) \
664 SymX(stg_ap_2_upd_info) \
665 SymX(stg_ap_3_upd_info) \
666 SymX(stg_ap_4_upd_info) \
667 SymX(stg_ap_5_upd_info) \
668 SymX(stg_ap_6_upd_info) \
669 SymX(stg_ap_7_upd_info) \
671 SymX(stg_sel_0_upd_info) \
672 SymX(stg_sel_10_upd_info) \
673 SymX(stg_sel_11_upd_info) \
674 SymX(stg_sel_12_upd_info) \
675 SymX(stg_sel_13_upd_info) \
676 SymX(stg_sel_14_upd_info) \
677 SymX(stg_sel_15_upd_info) \
678 SymX(stg_sel_1_upd_info) \
679 SymX(stg_sel_2_upd_info) \
680 SymX(stg_sel_3_upd_info) \
681 SymX(stg_sel_4_upd_info) \
682 SymX(stg_sel_5_upd_info) \
683 SymX(stg_sel_6_upd_info) \
684 SymX(stg_sel_7_upd_info) \
685 SymX(stg_sel_8_upd_info) \
686 SymX(stg_sel_9_upd_info) \
687 SymX(stg_upd_frame_info) \
688 SymX(suspendThread) \
689 SymX(takeMVarzh_fast) \
690 SymX(timesIntegerzh_fast) \
691 SymX(tryPutMVarzh_fast) \
692 SymX(tryTakeMVarzh_fast) \
693 SymX(unblockAsyncExceptionszh_fast) \
695 SymX(unsafeThawArrayzh_fast) \
696 SymX(waitReadzh_fast) \
697 SymX(waitWritezh_fast) \
698 SymX(word2Integerzh_fast) \
699 SymX(writeTVarzh_fast) \
700 SymX(xorIntegerzh_fast) \
702 SymX(stg_interp_constr_entry) \
705 SymX(getAllocations) \
708 RTS_USER_SIGNALS_SYMBOLS
710 #ifdef SUPPORT_LONG_LONGS
711 #define RTS_LONG_LONG_SYMS \
712 SymX(int64ToIntegerzh_fast) \
713 SymX(word64ToIntegerzh_fast)
715 #define RTS_LONG_LONG_SYMS /* nothing */
718 // 64-bit support functions in libgcc.a
719 #if defined(__GNUC__) && SIZEOF_VOID_P <= 4
720 #define RTS_LIBGCC_SYMBOLS \
730 #elif defined(ia64_HOST_ARCH)
731 #define RTS_LIBGCC_SYMBOLS \
739 #define RTS_LIBGCC_SYMBOLS
742 #if defined(darwin_HOST_OS) && defined(powerpc_HOST_ARCH)
743 // Symbols that don't have a leading underscore
744 // on Mac OS X. They have to receive special treatment,
745 // see machoInitSymbolsWithoutUnderscore()
746 #define RTS_MACHO_NOUNDERLINE_SYMBOLS \
751 /* entirely bogus claims about types of these symbols */
752 #define Sym(vvv) extern void vvv(void);
753 #define SymX(vvv) /**/
754 #define SymX_redirect(vvv,xxx) /**/
758 RTS_POSIX_ONLY_SYMBOLS
759 RTS_MINGW_ONLY_SYMBOLS
760 RTS_CYGWIN_ONLY_SYMBOLS
761 RTS_DARWIN_ONLY_SYMBOLS
767 #ifdef LEADING_UNDERSCORE
768 #define MAYBE_LEADING_UNDERSCORE_STR(s) ("_" s)
770 #define MAYBE_LEADING_UNDERSCORE_STR(s) (s)
773 #define Sym(vvv) { MAYBE_LEADING_UNDERSCORE_STR(#vvv), \
775 #define SymX(vvv) Sym(vvv)
777 // SymX_redirect allows us to redirect references to one symbol to
778 // another symbol. See newCAF/newDynCAF for an example.
779 #define SymX_redirect(vvv,xxx) \
780 { MAYBE_LEADING_UNDERSCORE_STR(#vvv), \
783 static RtsSymbolVal rtsSyms[] = {
787 RTS_POSIX_ONLY_SYMBOLS
788 RTS_MINGW_ONLY_SYMBOLS
789 RTS_CYGWIN_ONLY_SYMBOLS
790 RTS_DARWIN_ONLY_SYMBOLS
792 #if defined(darwin_HOST_OS) && defined(i386_HOST_ARCH)
793 // dyld stub code contains references to this,
794 // but it should never be called because we treat
795 // lazy pointers as nonlazy.
796 { "dyld_stub_binding_helper", (void*)0xDEADBEEF },
798 { 0, 0 } /* sentinel */
803 /* -----------------------------------------------------------------------------
804 * Insert symbols into hash tables, checking for duplicates.
807 static void ghciInsertStrHashTable ( char* obj_name,
813 if (lookupHashTable(table, (StgWord)key) == NULL)
815 insertStrHashTable(table, (StgWord)key, data);
820 "GHCi runtime linker: fatal error: I found a duplicate definition for symbol\n"
822 "whilst processing object file\n"
824 "This could be caused by:\n"
825 " * Loading two different object files which export the same symbol\n"
826 " * Specifying the same object file twice on the GHCi command line\n"
827 " * An incorrect `package.conf' entry, causing some object to be\n"
829 "GHCi cannot safely continue in this situation. Exiting now. Sorry.\n"
836 /* -----------------------------------------------------------------------------
837 * initialize the object linker
841 static int linker_init_done = 0 ;
843 #if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
844 static void *dl_prog_handle;
852 /* Make initLinker idempotent, so we can call it
853 before evey relevant operation; that means we
854 don't need to initialise the linker separately */
855 if (linker_init_done == 1) { return; } else {
856 linker_init_done = 1;
859 stablehash = allocStrHashTable();
860 symhash = allocStrHashTable();
862 /* populate the symbol table with stuff from the RTS */
863 for (sym = rtsSyms; sym->lbl != NULL; sym++) {
864 ghciInsertStrHashTable("(GHCi built-in symbols)",
865 symhash, sym->lbl, sym->addr);
867 # if defined(OBJFORMAT_MACHO) && defined(powerpc_HOST_ARCH)
868 machoInitSymbolsWithoutUnderscore();
871 # if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
872 # if defined(RTLD_DEFAULT)
873 dl_prog_handle = RTLD_DEFAULT;
875 dl_prog_handle = dlopen(NULL, RTLD_LAZY);
876 # endif /* RTLD_DEFAULT */
880 /* -----------------------------------------------------------------------------
881 * Loading DLL or .so dynamic libraries
882 * -----------------------------------------------------------------------------
884 * Add a DLL from which symbols may be found. In the ELF case, just
885 * do RTLD_GLOBAL-style add, so no further messing around needs to
886 * happen in order that symbols in the loaded .so are findable --
887 * lookupSymbol() will subsequently see them by dlsym on the program's
888 * dl-handle. Returns NULL if success, otherwise ptr to an err msg.
890 * In the PEi386 case, open the DLLs and put handles to them in a
891 * linked list. When looking for a symbol, try all handles in the
892 * list. This means that we need to load even DLLs that are guaranteed
893 * to be in the ghc.exe image already, just so we can get a handle
894 * to give to loadSymbol, so that we can find the symbols. For such
895 * libraries, the LoadLibrary call should be a no-op except for returning
900 #if defined(OBJFORMAT_PEi386)
901 /* A record for storing handles into DLLs. */
906 struct _OpenedDLL* next;
911 /* A list thereof. */
912 static OpenedDLL* opened_dlls = NULL;
916 addDLL( char *dll_name )
918 # if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
919 /* ------------------- ELF DLL loader ------------------- */
925 hdl= dlopen(dll_name, RTLD_NOW | RTLD_GLOBAL);
928 /* dlopen failed; return a ptr to the error msg. */
930 if (errmsg == NULL) errmsg = "addDLL: unknown error";
937 # elif defined(OBJFORMAT_PEi386)
938 /* ------------------- Win32 DLL loader ------------------- */
946 /* debugBelch("\naddDLL; dll_name = `%s'\n", dll_name); */
948 /* See if we've already got it, and ignore if so. */
949 for (o_dll = opened_dlls; o_dll != NULL; o_dll = o_dll->next) {
950 if (0 == strcmp(o_dll->name, dll_name))
954 /* The file name has no suffix (yet) so that we can try
955 both foo.dll and foo.drv
957 The documentation for LoadLibrary says:
958 If no file name extension is specified in the lpFileName
959 parameter, the default library extension .dll is
960 appended. However, the file name string can include a trailing
961 point character (.) to indicate that the module name has no
964 buf = stgMallocBytes(strlen(dll_name) + 10, "addDLL");
965 sprintf(buf, "%s.DLL", dll_name);
966 instance = LoadLibrary(buf);
967 if (instance == NULL) {
968 sprintf(buf, "%s.DRV", dll_name); // KAA: allow loading of drivers (like winspool.drv)
969 instance = LoadLibrary(buf);
970 if (instance == NULL) {
973 /* LoadLibrary failed; return a ptr to the error msg. */
974 return "addDLL: unknown error";
979 /* Add this DLL to the list of DLLs in which to search for symbols. */
980 o_dll = stgMallocBytes( sizeof(OpenedDLL), "addDLL" );
981 o_dll->name = stgMallocBytes(1+strlen(dll_name), "addDLL");
982 strcpy(o_dll->name, dll_name);
983 o_dll->instance = instance;
984 o_dll->next = opened_dlls;
989 barf("addDLL: not implemented on this platform");
993 /* -----------------------------------------------------------------------------
994 * insert a stable symbol in the hash table
998 insertStableSymbol(char* obj_name, char* key, StgPtr p)
1000 ghciInsertStrHashTable(obj_name, stablehash, key, getStablePtr(p));
1004 /* -----------------------------------------------------------------------------
1005 * insert a symbol in the hash table
1008 insertSymbol(char* obj_name, char* key, void* data)
1010 ghciInsertStrHashTable(obj_name, symhash, key, data);
1013 /* -----------------------------------------------------------------------------
1014 * lookup a symbol in the hash table
1017 lookupSymbol( char *lbl )
1021 ASSERT(symhash != NULL);
1022 val = lookupStrHashTable(symhash, lbl);
1025 # if defined(OBJFORMAT_ELF)
1026 # if defined(x86_64_HOST_ARCH)
1027 val = dlsym(dl_prog_handle, lbl);
1028 if (val >= (void *)0x80000000) {
1030 new_val = x86_64_high_symbol(lbl, val);
1031 IF_DEBUG(linker,debugBelch("lookupSymbol: relocating out of range symbol: %s = %p, now %p\n", lbl, val, new_val));
1037 return dlsym(dl_prog_handle, lbl);
1039 # elif defined(OBJFORMAT_MACHO)
1040 if(NSIsSymbolNameDefined(lbl)) {
1041 NSSymbol symbol = NSLookupAndBindSymbol(lbl);
1042 return NSAddressOfSymbol(symbol);
1046 # elif defined(OBJFORMAT_PEi386)
1049 for (o_dll = opened_dlls; o_dll != NULL; o_dll = o_dll->next) {
1050 /* debugBelch("look in %s for %s\n", o_dll->name, lbl); */
1051 if (lbl[0] == '_') {
1052 /* HACK: if the name has an initial underscore, try stripping
1053 it off & look that up first. I've yet to verify whether there's
1054 a Rule that governs whether an initial '_' *should always* be
1055 stripped off when mapping from import lib name to the DLL name.
1057 sym = GetProcAddress(o_dll->instance, (lbl+1));
1059 /*debugBelch("found %s in %s\n", lbl+1,o_dll->name);*/
1063 sym = GetProcAddress(o_dll->instance, lbl);
1065 /*debugBelch("found %s in %s\n", lbl,o_dll->name);*/
1080 __attribute((unused))
1082 lookupLocalSymbol( ObjectCode* oc, char *lbl )
1086 val = lookupStrHashTable(oc->lochash, lbl);
1096 /* -----------------------------------------------------------------------------
1097 * Debugging aid: look in GHCi's object symbol tables for symbols
1098 * within DELTA bytes of the specified address, and show their names.
1101 void ghci_enquire ( char* addr );
1103 void ghci_enquire ( char* addr )
1108 const int DELTA = 64;
1113 for (oc = objects; oc; oc = oc->next) {
1114 for (i = 0; i < oc->n_symbols; i++) {
1115 sym = oc->symbols[i];
1116 if (sym == NULL) continue;
1117 // debugBelch("enquire %p %p\n", sym, oc->lochash);
1119 if (oc->lochash != NULL) {
1120 a = lookupStrHashTable(oc->lochash, sym);
1123 a = lookupStrHashTable(symhash, sym);
1126 // debugBelch("ghci_enquire: can't find %s\n", sym);
1128 else if (addr-DELTA <= a && a <= addr+DELTA) {
1129 debugBelch("%p + %3d == `%s'\n", addr, (int)(a - addr), sym);
1136 #ifdef ia64_HOST_ARCH
1137 static unsigned int PLTSize(void);
1140 /* -----------------------------------------------------------------------------
1141 * Load an obj (populate the global symbol table, but don't resolve yet)
1143 * Returns: 1 if ok, 0 on error.
1146 loadObj( char *path )
1153 void *map_addr = NULL;
1159 /* debugBelch("loadObj %s\n", path ); */
1161 /* Check that we haven't already loaded this object.
1162 Ignore requests to load multiple times */
1166 for (o = objects; o; o = o->next) {
1167 if (0 == strcmp(o->fileName, path)) {
1169 break; /* don't need to search further */
1173 IF_DEBUG(linker, debugBelch(
1174 "GHCi runtime linker: warning: looks like you're trying to load the\n"
1175 "same object file twice:\n"
1177 "GHCi will ignore this, but be warned.\n"
1179 return 1; /* success */
1183 oc = stgMallocBytes(sizeof(ObjectCode), "loadObj(oc)");
1185 # if defined(OBJFORMAT_ELF)
1186 oc->formatName = "ELF";
1187 # elif defined(OBJFORMAT_PEi386)
1188 oc->formatName = "PEi386";
1189 # elif defined(OBJFORMAT_MACHO)
1190 oc->formatName = "Mach-O";
1193 barf("loadObj: not implemented on this platform");
1196 r = stat(path, &st);
1197 if (r == -1) { return 0; }
1199 /* sigh, strdup() isn't a POSIX function, so do it the long way */
1200 oc->fileName = stgMallocBytes( strlen(path)+1, "loadObj" );
1201 strcpy(oc->fileName, path);
1203 oc->fileSize = st.st_size;
1205 oc->sections = NULL;
1206 oc->lochash = allocStrHashTable();
1207 oc->proddables = NULL;
1209 /* chain it onto the list of objects */
1214 #define ROUND_UP(x,size) ((x + size - 1) & ~(size - 1))
1216 /* On many architectures malloc'd memory isn't executable, so we need to use mmap. */
1218 #if defined(openbsd_HOST_OS)
1219 fd = open(path, O_RDONLY, S_IRUSR);
1221 fd = open(path, O_RDONLY);
1224 barf("loadObj: can't open `%s'", path);
1226 pagesize = getpagesize();
1228 #ifdef ia64_HOST_ARCH
1229 /* The PLT needs to be right before the object */
1230 n = ROUND_UP(PLTSize(), pagesize);
1231 oc->plt = mmap(NULL, n, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
1232 if (oc->plt == MAP_FAILED)
1233 barf("loadObj: can't allocate PLT");
1236 map_addr = oc->plt + n;
1239 n = ROUND_UP(oc->fileSize, pagesize);
1241 /* Link objects into the lower 2Gb on x86_64. GHC assumes the
1242 * small memory model on this architecture (see gcc docs,
1245 #ifdef x86_64_HOST_ARCH
1246 #define EXTRA_MAP_FLAGS MAP_32BIT
1248 #define EXTRA_MAP_FLAGS 0
1251 oc->image = mmap(map_addr, n, PROT_EXEC|PROT_READ|PROT_WRITE,
1252 MAP_PRIVATE|EXTRA_MAP_FLAGS, fd, 0);
1253 if (oc->image == MAP_FAILED)
1254 barf("loadObj: can't map `%s'", path);
1258 #else /* !USE_MMAP */
1260 /* load the image into memory */
1261 f = fopen(path, "rb");
1263 barf("loadObj: can't read `%s'", path);
1265 # if defined(mingw32_HOST_OS)
1266 // TODO: We would like to use allocateExec here, but allocateExec
1267 // cannot currently allocate blocks large enough.
1268 oc->image = VirtualAlloc(NULL, oc->fileSize, MEM_RESERVE | MEM_COMMIT,
1269 PAGE_EXECUTE_READWRITE);
1270 # elif defined(darwin_HOST_OS)
1271 // In a Mach-O .o file, all sections can and will be misaligned
1272 // if the total size of the headers is not a multiple of the
1273 // desired alignment. This is fine for .o files that only serve
1274 // as input for the static linker, but it's not fine for us,
1275 // as SSE (used by gcc for floating point) and Altivec require
1276 // 16-byte alignment.
1277 // We calculate the correct alignment from the header before
1278 // reading the file, and then we misalign oc->image on purpose so
1279 // that the actual sections end up aligned again.
1280 oc->misalignment = machoGetMisalignment(f);
1281 oc->image = stgMallocBytes(oc->fileSize + oc->misalignment, "loadObj(image)");
1282 oc->image += oc->misalignment;
1284 oc->image = stgMallocBytes(oc->fileSize, "loadObj(image)");
1287 n = fread ( oc->image, 1, oc->fileSize, f );
1288 if (n != oc->fileSize)
1289 barf("loadObj: error whilst reading `%s'", path);
1293 #endif /* USE_MMAP */
1295 # if defined(OBJFORMAT_MACHO) && defined(powerpc_HOST_ARCH)
1296 r = ocAllocateJumpIslands_MachO ( oc );
1297 if (!r) { return r; }
1298 # elif defined(OBJFORMAT_ELF) && defined(powerpc_HOST_ARCH)
1299 r = ocAllocateJumpIslands_ELF ( oc );
1300 if (!r) { return r; }
1303 /* verify the in-memory image */
1304 # if defined(OBJFORMAT_ELF)
1305 r = ocVerifyImage_ELF ( oc );
1306 # elif defined(OBJFORMAT_PEi386)
1307 r = ocVerifyImage_PEi386 ( oc );
1308 # elif defined(OBJFORMAT_MACHO)
1309 r = ocVerifyImage_MachO ( oc );
1311 barf("loadObj: no verify method");
1313 if (!r) { return r; }
1315 /* build the symbol list for this image */
1316 # if defined(OBJFORMAT_ELF)
1317 r = ocGetNames_ELF ( oc );
1318 # elif defined(OBJFORMAT_PEi386)
1319 r = ocGetNames_PEi386 ( oc );
1320 # elif defined(OBJFORMAT_MACHO)
1321 r = ocGetNames_MachO ( oc );
1323 barf("loadObj: no getNames method");
1325 if (!r) { return r; }
1327 /* loaded, but not resolved yet */
1328 oc->status = OBJECT_LOADED;
1333 /* -----------------------------------------------------------------------------
1334 * resolve all the currently unlinked objects in memory
1336 * Returns: 1 if ok, 0 on error.
1346 for (oc = objects; oc; oc = oc->next) {
1347 if (oc->status != OBJECT_RESOLVED) {
1348 # if defined(OBJFORMAT_ELF)
1349 r = ocResolve_ELF ( oc );
1350 # elif defined(OBJFORMAT_PEi386)
1351 r = ocResolve_PEi386 ( oc );
1352 # elif defined(OBJFORMAT_MACHO)
1353 r = ocResolve_MachO ( oc );
1355 barf("resolveObjs: not implemented on this platform");
1357 if (!r) { return r; }
1358 oc->status = OBJECT_RESOLVED;
1364 /* -----------------------------------------------------------------------------
1365 * delete an object from the pool
1368 unloadObj( char *path )
1370 ObjectCode *oc, *prev;
1372 ASSERT(symhash != NULL);
1373 ASSERT(objects != NULL);
1378 for (oc = objects; oc; prev = oc, oc = oc->next) {
1379 if (!strcmp(oc->fileName,path)) {
1381 /* Remove all the mappings for the symbols within this
1386 for (i = 0; i < oc->n_symbols; i++) {
1387 if (oc->symbols[i] != NULL) {
1388 removeStrHashTable(symhash, oc->symbols[i], NULL);
1396 prev->next = oc->next;
1399 // We're going to leave this in place, in case there are
1400 // any pointers from the heap into it:
1401 // #ifdef mingw32_HOST_OS
1402 // VirtualFree(oc->image);
1404 // stgFree(oc->image);
1406 stgFree(oc->fileName);
1407 stgFree(oc->symbols);
1408 stgFree(oc->sections);
1409 /* The local hash table should have been freed at the end
1410 of the ocResolve_ call on it. */
1411 ASSERT(oc->lochash == NULL);
1417 errorBelch("unloadObj: can't find `%s' to unload", path);
1421 /* -----------------------------------------------------------------------------
1422 * Sanity checking. For each ObjectCode, maintain a list of address ranges
1423 * which may be prodded during relocation, and abort if we try and write
1424 * outside any of these.
1426 static void addProddableBlock ( ObjectCode* oc, void* start, int size )
1429 = stgMallocBytes(sizeof(ProddableBlock), "addProddableBlock");
1430 /* debugBelch("aPB %p %p %d\n", oc, start, size); */
1434 pb->next = oc->proddables;
1435 oc->proddables = pb;
1438 static void checkProddableBlock ( ObjectCode* oc, void* addr )
1441 for (pb = oc->proddables; pb != NULL; pb = pb->next) {
1442 char* s = (char*)(pb->start);
1443 char* e = s + pb->size - 1;
1444 char* a = (char*)addr;
1445 /* Assumes that the biggest fixup involves a 4-byte write. This
1446 probably needs to be changed to 8 (ie, +7) on 64-bit
1448 if (a >= s && (a+3) <= e) return;
1450 barf("checkProddableBlock: invalid fixup in runtime linker");
1453 /* -----------------------------------------------------------------------------
1454 * Section management.
1456 static void addSection ( ObjectCode* oc, SectionKind kind,
1457 void* start, void* end )
1459 Section* s = stgMallocBytes(sizeof(Section), "addSection");
1463 s->next = oc->sections;
1466 debugBelch("addSection: %p-%p (size %d), kind %d\n",
1467 start, ((char*)end)-1, end - start + 1, kind );
1472 /* --------------------------------------------------------------------------
1473 * PowerPC specifics (jump islands)
1474 * ------------------------------------------------------------------------*/
1476 #if defined(powerpc_HOST_ARCH)
1479 ocAllocateJumpIslands
1481 Allocate additional space at the end of the object file image to make room
1484 PowerPC relative branch instructions have a 24 bit displacement field.
1485 As PPC code is always 4-byte-aligned, this yields a +-32MB range.
1486 If a particular imported symbol is outside this range, we have to redirect
1487 the jump to a short piece of new code that just loads the 32bit absolute
1488 address and jumps there.
1489 This function just allocates space for one 16 byte ppcJumpIsland for every
1490 undefined symbol in the object file. The code for the islands is filled in by
1491 makeJumpIsland below.
1494 static int ocAllocateJumpIslands( ObjectCode* oc, int count, int first )
1500 int misalignment = 0;
1502 misalignment = oc->misalignment;
1507 // round up to the nearest 4
1508 aligned = (oc->fileSize + 3) & ~3;
1511 #ifndef linux_HOST_OS /* mremap is a linux extension */
1512 #error ocAllocateJumpIslands doesnt want USE_MMAP to be defined
1515 pagesize = getpagesize();
1516 n = ROUND_UP( oc->fileSize, pagesize );
1517 m = ROUND_UP( aligned + sizeof (ppcJumpIsland) * count, pagesize );
1519 /* If we have a half-page-size file and map one page of it then
1520 * the part of the page after the size of the file remains accessible.
1521 * If, however, we map in 2 pages, the 2nd page is not accessible
1522 * and will give a "Bus Error" on access. To get around this, we check
1523 * if we need any extra pages for the jump islands and map them in
1524 * anonymously. We must check that we actually require extra pages
1525 * otherwise the attempt to mmap 0 pages of anonymous memory will
1531 /* The effect of this mremap() call is only the ensure that we have
1532 * a sufficient number of virtually contiguous pages. As returned from
1533 * mremap, the pages past the end of the file are not backed. We give
1534 * them a backing by using MAP_FIXED to map in anonymous pages.
1536 oc->image = mremap( oc->image, n, m, MREMAP_MAYMOVE );
1538 if( oc->image == MAP_FAILED )
1540 errorBelch( "Unable to mremap for Jump Islands\n" );
1544 if( mmap( oc->image + n, m - n, PROT_READ | PROT_WRITE | PROT_EXEC,
1545 MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED, 0, 0 ) == MAP_FAILED )
1547 errorBelch( "Unable to mmap( MAP_FIXED ) for Jump Islands\n" );
1553 oc->image -= misalignment;
1554 oc->image = stgReallocBytes( oc->image,
1556 aligned + sizeof (ppcJumpIsland) * count,
1557 "ocAllocateJumpIslands" );
1558 oc->image += misalignment;
1559 #endif /* USE_MMAP */
1561 oc->jump_islands = (ppcJumpIsland *) (oc->image + aligned);
1562 memset( oc->jump_islands, 0, sizeof (ppcJumpIsland) * count );
1565 oc->jump_islands = NULL;
1567 oc->island_start_symbol = first;
1568 oc->n_islands = count;
1573 static unsigned long makeJumpIsland( ObjectCode* oc,
1574 unsigned long symbolNumber,
1575 unsigned long target )
1577 ppcJumpIsland *island;
1579 if( symbolNumber < oc->island_start_symbol ||
1580 symbolNumber - oc->island_start_symbol > oc->n_islands)
1583 island = &oc->jump_islands[symbolNumber - oc->island_start_symbol];
1585 // lis r12, hi16(target)
1586 island->lis_r12 = 0x3d80;
1587 island->hi_addr = target >> 16;
1589 // ori r12, r12, lo16(target)
1590 island->ori_r12_r12 = 0x618c;
1591 island->lo_addr = target & 0xffff;
1594 island->mtctr_r12 = 0x7d8903a6;
1597 island->bctr = 0x4e800420;
1599 return (unsigned long) island;
1603 ocFlushInstructionCache
1605 Flush the data & instruction caches.
1606 Because the PPC has split data/instruction caches, we have to
1607 do that whenever we modify code at runtime.
1610 static void ocFlushInstructionCache( ObjectCode *oc )
1612 int n = (oc->fileSize + sizeof( ppcJumpIsland ) * oc->n_islands + 3) / 4;
1613 unsigned long *p = (unsigned long *) oc->image;
1617 __asm__ volatile ( "dcbf 0,%0\n\t"
1625 __asm__ volatile ( "sync\n\t"
1631 /* --------------------------------------------------------------------------
1632 * PEi386 specifics (Win32 targets)
1633 * ------------------------------------------------------------------------*/
1635 /* The information for this linker comes from
1636 Microsoft Portable Executable
1637 and Common Object File Format Specification
1638 revision 5.1 January 1998
1639 which SimonM says comes from the MS Developer Network CDs.
1641 It can be found there (on older CDs), but can also be found
1644 http://www.microsoft.com/hwdev/hardware/PECOFF.asp
1646 (this is Rev 6.0 from February 1999).
1648 Things move, so if that fails, try searching for it via
1650 http://www.google.com/search?q=PE+COFF+specification
1652 The ultimate reference for the PE format is the Winnt.h
1653 header file that comes with the Platform SDKs; as always,
1654 implementations will drift wrt their documentation.
1656 A good background article on the PE format is Matt Pietrek's
1657 March 1994 article in Microsoft System Journal (MSJ)
1658 (Vol.9, No. 3): "Peering Inside the PE: A Tour of the
1659 Win32 Portable Executable File Format." The info in there
1660 has recently been updated in a two part article in
1661 MSDN magazine, issues Feb and March 2002,
1662 "Inside Windows: An In-Depth Look into the Win32 Portable
1663 Executable File Format"
1665 John Levine's book "Linkers and Loaders" contains useful
1670 #if defined(OBJFORMAT_PEi386)
1674 typedef unsigned char UChar;
1675 typedef unsigned short UInt16;
1676 typedef unsigned int UInt32;
1683 UInt16 NumberOfSections;
1684 UInt32 TimeDateStamp;
1685 UInt32 PointerToSymbolTable;
1686 UInt32 NumberOfSymbols;
1687 UInt16 SizeOfOptionalHeader;
1688 UInt16 Characteristics;
1692 #define sizeof_COFF_header 20
1699 UInt32 VirtualAddress;
1700 UInt32 SizeOfRawData;
1701 UInt32 PointerToRawData;
1702 UInt32 PointerToRelocations;
1703 UInt32 PointerToLinenumbers;
1704 UInt16 NumberOfRelocations;
1705 UInt16 NumberOfLineNumbers;
1706 UInt32 Characteristics;
1710 #define sizeof_COFF_section 40
1717 UInt16 SectionNumber;
1720 UChar NumberOfAuxSymbols;
1724 #define sizeof_COFF_symbol 18
1729 UInt32 VirtualAddress;
1730 UInt32 SymbolTableIndex;
1735 #define sizeof_COFF_reloc 10
1738 /* From PE spec doc, section 3.3.2 */
1739 /* Note use of MYIMAGE_* since IMAGE_* are already defined in
1740 windows.h -- for the same purpose, but I want to know what I'm
1742 #define MYIMAGE_FILE_RELOCS_STRIPPED 0x0001
1743 #define MYIMAGE_FILE_EXECUTABLE_IMAGE 0x0002
1744 #define MYIMAGE_FILE_DLL 0x2000
1745 #define MYIMAGE_FILE_SYSTEM 0x1000
1746 #define MYIMAGE_FILE_BYTES_REVERSED_HI 0x8000
1747 #define MYIMAGE_FILE_BYTES_REVERSED_LO 0x0080
1748 #define MYIMAGE_FILE_32BIT_MACHINE 0x0100
1750 /* From PE spec doc, section 5.4.2 and 5.4.4 */
1751 #define MYIMAGE_SYM_CLASS_EXTERNAL 2
1752 #define MYIMAGE_SYM_CLASS_STATIC 3
1753 #define MYIMAGE_SYM_UNDEFINED 0
1755 /* From PE spec doc, section 4.1 */
1756 #define MYIMAGE_SCN_CNT_CODE 0x00000020
1757 #define MYIMAGE_SCN_CNT_INITIALIZED_DATA 0x00000040
1758 #define MYIMAGE_SCN_LNK_NRELOC_OVFL 0x01000000
1760 /* From PE spec doc, section 5.2.1 */
1761 #define MYIMAGE_REL_I386_DIR32 0x0006
1762 #define MYIMAGE_REL_I386_REL32 0x0014
1765 /* We use myindex to calculate array addresses, rather than
1766 simply doing the normal subscript thing. That's because
1767 some of the above structs have sizes which are not
1768 a whole number of words. GCC rounds their sizes up to a
1769 whole number of words, which means that the address calcs
1770 arising from using normal C indexing or pointer arithmetic
1771 are just plain wrong. Sigh.
1774 myindex ( int scale, void* base, int index )
1777 ((UChar*)base) + scale * index;
1782 printName ( UChar* name, UChar* strtab )
1784 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
1785 UInt32 strtab_offset = * (UInt32*)(name+4);
1786 debugBelch("%s", strtab + strtab_offset );
1789 for (i = 0; i < 8; i++) {
1790 if (name[i] == 0) break;
1791 debugBelch("%c", name[i] );
1798 copyName ( UChar* name, UChar* strtab, UChar* dst, int dstSize )
1800 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
1801 UInt32 strtab_offset = * (UInt32*)(name+4);
1802 strncpy ( dst, strtab+strtab_offset, dstSize );
1808 if (name[i] == 0) break;
1818 cstring_from_COFF_symbol_name ( UChar* name, UChar* strtab )
1821 /* If the string is longer than 8 bytes, look in the
1822 string table for it -- this will be correctly zero terminated.
1824 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
1825 UInt32 strtab_offset = * (UInt32*)(name+4);
1826 return ((UChar*)strtab) + strtab_offset;
1828 /* Otherwise, if shorter than 8 bytes, return the original,
1829 which by defn is correctly terminated.
1831 if (name[7]==0) return name;
1832 /* The annoying case: 8 bytes. Copy into a temporary
1833 (which is never freed ...)
1835 newstr = stgMallocBytes(9, "cstring_from_COFF_symbol_name");
1837 strncpy(newstr,name,8);
1843 /* Just compares the short names (first 8 chars) */
1844 static COFF_section *
1845 findPEi386SectionCalled ( ObjectCode* oc, char* name )
1849 = (COFF_header*)(oc->image);
1850 COFF_section* sectab
1852 ((UChar*)(oc->image))
1853 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
1855 for (i = 0; i < hdr->NumberOfSections; i++) {
1858 COFF_section* section_i
1860 myindex ( sizeof_COFF_section, sectab, i );
1861 n1 = (UChar*) &(section_i->Name);
1863 if (n1[0]==n2[0] && n1[1]==n2[1] && n1[2]==n2[2] &&
1864 n1[3]==n2[3] && n1[4]==n2[4] && n1[5]==n2[5] &&
1865 n1[6]==n2[6] && n1[7]==n2[7])
1874 zapTrailingAtSign ( UChar* sym )
1876 # define my_isdigit(c) ((c) >= '0' && (c) <= '9')
1878 if (sym[0] == 0) return;
1880 while (sym[i] != 0) i++;
1883 while (j > 0 && my_isdigit(sym[j])) j--;
1884 if (j > 0 && sym[j] == '@' && j != i) sym[j] = 0;
1890 ocVerifyImage_PEi386 ( ObjectCode* oc )
1895 COFF_section* sectab;
1896 COFF_symbol* symtab;
1898 /* debugBelch("\nLOADING %s\n", oc->fileName); */
1899 hdr = (COFF_header*)(oc->image);
1900 sectab = (COFF_section*) (
1901 ((UChar*)(oc->image))
1902 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
1904 symtab = (COFF_symbol*) (
1905 ((UChar*)(oc->image))
1906 + hdr->PointerToSymbolTable
1908 strtab = ((UChar*)symtab)
1909 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
1911 if (hdr->Machine != 0x14c) {
1912 errorBelch("%s: Not x86 PEi386", oc->fileName);
1915 if (hdr->SizeOfOptionalHeader != 0) {
1916 errorBelch("%s: PEi386 with nonempty optional header", oc->fileName);
1919 if ( /* (hdr->Characteristics & MYIMAGE_FILE_RELOCS_STRIPPED) || */
1920 (hdr->Characteristics & MYIMAGE_FILE_EXECUTABLE_IMAGE) ||
1921 (hdr->Characteristics & MYIMAGE_FILE_DLL) ||
1922 (hdr->Characteristics & MYIMAGE_FILE_SYSTEM) ) {
1923 errorBelch("%s: Not a PEi386 object file", oc->fileName);
1926 if ( (hdr->Characteristics & MYIMAGE_FILE_BYTES_REVERSED_HI)
1927 /* || !(hdr->Characteristics & MYIMAGE_FILE_32BIT_MACHINE) */ ) {
1928 errorBelch("%s: Invalid PEi386 word size or endiannness: %d",
1930 (int)(hdr->Characteristics));
1933 /* If the string table size is way crazy, this might indicate that
1934 there are more than 64k relocations, despite claims to the
1935 contrary. Hence this test. */
1936 /* debugBelch("strtab size %d\n", * (UInt32*)strtab); */
1938 if ( (*(UInt32*)strtab) > 600000 ) {
1939 /* Note that 600k has no special significance other than being
1940 big enough to handle the almost-2MB-sized lumps that
1941 constitute HSwin32*.o. */
1942 debugBelch("PEi386 object has suspiciously large string table; > 64k relocs?");
1947 /* No further verification after this point; only debug printing. */
1949 IF_DEBUG(linker, i=1);
1950 if (i == 0) return 1;
1952 debugBelch( "sectab offset = %d\n", ((UChar*)sectab) - ((UChar*)hdr) );
1953 debugBelch( "symtab offset = %d\n", ((UChar*)symtab) - ((UChar*)hdr) );
1954 debugBelch( "strtab offset = %d\n", ((UChar*)strtab) - ((UChar*)hdr) );
1957 debugBelch( "Machine: 0x%x\n", (UInt32)(hdr->Machine) );
1958 debugBelch( "# sections: %d\n", (UInt32)(hdr->NumberOfSections) );
1959 debugBelch( "time/date: 0x%x\n", (UInt32)(hdr->TimeDateStamp) );
1960 debugBelch( "symtab offset: %d\n", (UInt32)(hdr->PointerToSymbolTable) );
1961 debugBelch( "# symbols: %d\n", (UInt32)(hdr->NumberOfSymbols) );
1962 debugBelch( "sz of opt hdr: %d\n", (UInt32)(hdr->SizeOfOptionalHeader) );
1963 debugBelch( "characteristics: 0x%x\n", (UInt32)(hdr->Characteristics) );
1965 /* Print the section table. */
1967 for (i = 0; i < hdr->NumberOfSections; i++) {
1969 COFF_section* sectab_i
1971 myindex ( sizeof_COFF_section, sectab, i );
1978 printName ( sectab_i->Name, strtab );
1988 sectab_i->VirtualSize,
1989 sectab_i->VirtualAddress,
1990 sectab_i->SizeOfRawData,
1991 sectab_i->PointerToRawData,
1992 sectab_i->NumberOfRelocations,
1993 sectab_i->PointerToRelocations,
1994 sectab_i->PointerToRawData
1996 reltab = (COFF_reloc*) (
1997 ((UChar*)(oc->image)) + sectab_i->PointerToRelocations
2000 if ( sectab_i->Characteristics & MYIMAGE_SCN_LNK_NRELOC_OVFL ) {
2001 /* If the relocation field (a short) has overflowed, the
2002 * real count can be found in the first reloc entry.
2004 * See Section 4.1 (last para) of the PE spec (rev6.0).
2006 COFF_reloc* rel = (COFF_reloc*)
2007 myindex ( sizeof_COFF_reloc, reltab, 0 );
2008 noRelocs = rel->VirtualAddress;
2011 noRelocs = sectab_i->NumberOfRelocations;
2015 for (; j < noRelocs; j++) {
2017 COFF_reloc* rel = (COFF_reloc*)
2018 myindex ( sizeof_COFF_reloc, reltab, j );
2020 " type 0x%-4x vaddr 0x%-8x name `",
2022 rel->VirtualAddress );
2023 sym = (COFF_symbol*)
2024 myindex ( sizeof_COFF_symbol, symtab, rel->SymbolTableIndex );
2025 /* Hmm..mysterious looking offset - what's it for? SOF */
2026 printName ( sym->Name, strtab -10 );
2033 debugBelch("string table has size 0x%x\n", * (UInt32*)strtab );
2034 debugBelch("---START of string table---\n");
2035 for (i = 4; i < *(Int32*)strtab; i++) {
2037 debugBelch("\n"); else
2038 debugBelch("%c", strtab[i] );
2040 debugBelch("--- END of string table---\n");
2045 COFF_symbol* symtab_i;
2046 if (i >= (Int32)(hdr->NumberOfSymbols)) break;
2047 symtab_i = (COFF_symbol*)
2048 myindex ( sizeof_COFF_symbol, symtab, i );
2054 printName ( symtab_i->Name, strtab );
2063 (Int32)(symtab_i->SectionNumber),
2064 (UInt32)symtab_i->Type,
2065 (UInt32)symtab_i->StorageClass,
2066 (UInt32)symtab_i->NumberOfAuxSymbols
2068 i += symtab_i->NumberOfAuxSymbols;
2078 ocGetNames_PEi386 ( ObjectCode* oc )
2081 COFF_section* sectab;
2082 COFF_symbol* symtab;
2089 hdr = (COFF_header*)(oc->image);
2090 sectab = (COFF_section*) (
2091 ((UChar*)(oc->image))
2092 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2094 symtab = (COFF_symbol*) (
2095 ((UChar*)(oc->image))
2096 + hdr->PointerToSymbolTable
2098 strtab = ((UChar*)(oc->image))
2099 + hdr->PointerToSymbolTable
2100 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
2102 /* Allocate space for any (local, anonymous) .bss sections. */
2104 for (i = 0; i < hdr->NumberOfSections; i++) {
2107 COFF_section* sectab_i
2109 myindex ( sizeof_COFF_section, sectab, i );
2110 if (0 != strcmp(sectab_i->Name, ".bss")) continue;
2111 /* sof 10/05: the PE spec text isn't too clear regarding what
2112 * the SizeOfRawData field is supposed to hold for object
2113 * file sections containing just uninitialized data -- for executables,
2114 * it is supposed to be zero; unclear what it's supposed to be
2115 * for object files. However, VirtualSize is guaranteed to be
2116 * zero for object files, which definitely suggests that SizeOfRawData
2117 * will be non-zero (where else would the size of this .bss section be
2118 * stored?) Looking at the COFF_section info for incoming object files,
2119 * this certainly appears to be the case.
2121 * => I suspect we've been incorrectly handling .bss sections in (relocatable)
2122 * object files up until now. This turned out to bite us with ghc-6.4.1's use
2123 * of gcc-3.4.x, which has started to emit initially-zeroed-out local 'static'
2124 * variable decls into to the .bss section. (The specific function in Q which
2125 * triggered this is libraries/base/cbits/dirUtils.c:__hscore_getFolderPath())
2127 if (sectab_i->VirtualSize == 0 && sectab_i->SizeOfRawData == 0) continue;
2128 /* This is a non-empty .bss section. Allocate zeroed space for
2129 it, and set its PointerToRawData field such that oc->image +
2130 PointerToRawData == addr_of_zeroed_space. */
2131 bss_sz = sectab_i->VirtualSize;
2132 if ( bss_sz < sectab_i->SizeOfRawData) { bss_sz = sectab_i->SizeOfRawData; }
2133 zspace = stgCallocBytes(1, bss_sz, "ocGetNames_PEi386(anonymous bss)");
2134 sectab_i->PointerToRawData = ((UChar*)zspace) - ((UChar*)(oc->image));
2135 addProddableBlock(oc, zspace, bss_sz);
2136 /* debugBelch("BSS anon section at 0x%x\n", zspace); */
2139 /* Copy section information into the ObjectCode. */
2141 for (i = 0; i < hdr->NumberOfSections; i++) {
2147 = SECTIONKIND_OTHER;
2148 COFF_section* sectab_i
2150 myindex ( sizeof_COFF_section, sectab, i );
2151 IF_DEBUG(linker, debugBelch("section name = %s\n", sectab_i->Name ));
2154 /* I'm sure this is the Right Way to do it. However, the
2155 alternative of testing the sectab_i->Name field seems to
2156 work ok with Cygwin.
2158 if (sectab_i->Characteristics & MYIMAGE_SCN_CNT_CODE ||
2159 sectab_i->Characteristics & MYIMAGE_SCN_CNT_INITIALIZED_DATA)
2160 kind = SECTIONKIND_CODE_OR_RODATA;
2163 if (0==strcmp(".text",sectab_i->Name) ||
2164 0==strcmp(".rdata",sectab_i->Name)||
2165 0==strcmp(".rodata",sectab_i->Name))
2166 kind = SECTIONKIND_CODE_OR_RODATA;
2167 if (0==strcmp(".data",sectab_i->Name) ||
2168 0==strcmp(".bss",sectab_i->Name))
2169 kind = SECTIONKIND_RWDATA;
2171 ASSERT(sectab_i->SizeOfRawData == 0 || sectab_i->VirtualSize == 0);
2172 sz = sectab_i->SizeOfRawData;
2173 if (sz < sectab_i->VirtualSize) sz = sectab_i->VirtualSize;
2175 start = ((UChar*)(oc->image)) + sectab_i->PointerToRawData;
2176 end = start + sz - 1;
2178 if (kind == SECTIONKIND_OTHER
2179 /* Ignore sections called which contain stabs debugging
2181 && 0 != strcmp(".stab", sectab_i->Name)
2182 && 0 != strcmp(".stabstr", sectab_i->Name)
2183 /* ignore constructor section for now */
2184 && 0 != strcmp(".ctors", sectab_i->Name)
2185 /* ignore section generated from .ident */
2186 && 0!= strcmp("/4", sectab_i->Name)
2188 errorBelch("Unknown PEi386 section name `%s' (while processing: %s)", sectab_i->Name, oc->fileName);
2192 if (kind != SECTIONKIND_OTHER && end >= start) {
2193 addSection(oc, kind, start, end);
2194 addProddableBlock(oc, start, end - start + 1);
2198 /* Copy exported symbols into the ObjectCode. */
2200 oc->n_symbols = hdr->NumberOfSymbols;
2201 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
2202 "ocGetNames_PEi386(oc->symbols)");
2203 /* Call me paranoid; I don't care. */
2204 for (i = 0; i < oc->n_symbols; i++)
2205 oc->symbols[i] = NULL;
2209 COFF_symbol* symtab_i;
2210 if (i >= (Int32)(hdr->NumberOfSymbols)) break;
2211 symtab_i = (COFF_symbol*)
2212 myindex ( sizeof_COFF_symbol, symtab, i );
2216 if (symtab_i->StorageClass == MYIMAGE_SYM_CLASS_EXTERNAL
2217 && symtab_i->SectionNumber != MYIMAGE_SYM_UNDEFINED) {
2218 /* This symbol is global and defined, viz, exported */
2219 /* for MYIMAGE_SYMCLASS_EXTERNAL
2220 && !MYIMAGE_SYM_UNDEFINED,
2221 the address of the symbol is:
2222 address of relevant section + offset in section
2224 COFF_section* sectabent
2225 = (COFF_section*) myindex ( sizeof_COFF_section,
2227 symtab_i->SectionNumber-1 );
2228 addr = ((UChar*)(oc->image))
2229 + (sectabent->PointerToRawData
2233 if (symtab_i->SectionNumber == MYIMAGE_SYM_UNDEFINED
2234 && symtab_i->Value > 0) {
2235 /* This symbol isn't in any section at all, ie, global bss.
2236 Allocate zeroed space for it. */
2237 addr = stgCallocBytes(1, symtab_i->Value,
2238 "ocGetNames_PEi386(non-anonymous bss)");
2239 addSection(oc, SECTIONKIND_RWDATA, addr,
2240 ((UChar*)addr) + symtab_i->Value - 1);
2241 addProddableBlock(oc, addr, symtab_i->Value);
2242 /* debugBelch("BSS section at 0x%x\n", addr); */
2245 if (addr != NULL ) {
2246 sname = cstring_from_COFF_symbol_name ( symtab_i->Name, strtab );
2247 /* debugBelch("addSymbol %p `%s \n", addr,sname); */
2248 IF_DEBUG(linker, debugBelch("addSymbol %p `%s'\n", addr,sname);)
2249 ASSERT(i >= 0 && i < oc->n_symbols);
2250 /* cstring_from_COFF_symbol_name always succeeds. */
2251 oc->symbols[i] = sname;
2252 ghciInsertStrHashTable(oc->fileName, symhash, sname, addr);
2256 "IGNORING symbol %d\n"
2260 printName ( symtab_i->Name, strtab );
2269 (Int32)(symtab_i->SectionNumber),
2270 (UInt32)symtab_i->Type,
2271 (UInt32)symtab_i->StorageClass,
2272 (UInt32)symtab_i->NumberOfAuxSymbols
2277 i += symtab_i->NumberOfAuxSymbols;
2286 ocResolve_PEi386 ( ObjectCode* oc )
2289 COFF_section* sectab;
2290 COFF_symbol* symtab;
2300 /* ToDo: should be variable-sized? But is at least safe in the
2301 sense of buffer-overrun-proof. */
2303 /* debugBelch("resolving for %s\n", oc->fileName); */
2305 hdr = (COFF_header*)(oc->image);
2306 sectab = (COFF_section*) (
2307 ((UChar*)(oc->image))
2308 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2310 symtab = (COFF_symbol*) (
2311 ((UChar*)(oc->image))
2312 + hdr->PointerToSymbolTable
2314 strtab = ((UChar*)(oc->image))
2315 + hdr->PointerToSymbolTable
2316 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
2318 for (i = 0; i < hdr->NumberOfSections; i++) {
2319 COFF_section* sectab_i
2321 myindex ( sizeof_COFF_section, sectab, i );
2324 ((UChar*)(oc->image)) + sectab_i->PointerToRelocations
2327 /* Ignore sections called which contain stabs debugging
2329 if (0 == strcmp(".stab", sectab_i->Name)
2330 || 0 == strcmp(".stabstr", sectab_i->Name)
2331 || 0 == strcmp(".ctors", sectab_i->Name))
2334 if ( sectab_i->Characteristics & MYIMAGE_SCN_LNK_NRELOC_OVFL ) {
2335 /* If the relocation field (a short) has overflowed, the
2336 * real count can be found in the first reloc entry.
2338 * See Section 4.1 (last para) of the PE spec (rev6.0).
2340 * Nov2003 update: the GNU linker still doesn't correctly
2341 * handle the generation of relocatable object files with
2342 * overflown relocations. Hence the output to warn of potential
2345 COFF_reloc* rel = (COFF_reloc*)
2346 myindex ( sizeof_COFF_reloc, reltab, 0 );
2347 noRelocs = rel->VirtualAddress;
2349 /* 10/05: we now assume (and check for) a GNU ld that is capable
2350 * of handling object files with (>2^16) of relocs.
2353 debugBelch("WARNING: Overflown relocation field (# relocs found: %u)\n",
2358 noRelocs = sectab_i->NumberOfRelocations;
2363 for (; j < noRelocs; j++) {
2365 COFF_reloc* reltab_j
2367 myindex ( sizeof_COFF_reloc, reltab, j );
2369 /* the location to patch */
2371 ((UChar*)(oc->image))
2372 + (sectab_i->PointerToRawData
2373 + reltab_j->VirtualAddress
2374 - sectab_i->VirtualAddress )
2376 /* the existing contents of pP */
2378 /* the symbol to connect to */
2379 sym = (COFF_symbol*)
2380 myindex ( sizeof_COFF_symbol,
2381 symtab, reltab_j->SymbolTableIndex );
2384 "reloc sec %2d num %3d: type 0x%-4x "
2385 "vaddr 0x%-8x name `",
2387 (UInt32)reltab_j->Type,
2388 reltab_j->VirtualAddress );
2389 printName ( sym->Name, strtab );
2390 debugBelch("'\n" ));
2392 if (sym->StorageClass == MYIMAGE_SYM_CLASS_STATIC) {
2393 COFF_section* section_sym
2394 = findPEi386SectionCalled ( oc, sym->Name );
2396 errorBelch("%s: can't find section `%s'", oc->fileName, sym->Name);
2399 S = ((UInt32)(oc->image))
2400 + (section_sym->PointerToRawData
2403 copyName ( sym->Name, strtab, symbol, 1000-1 );
2404 S = (UInt32) lookupLocalSymbol( oc, symbol );
2405 if ((void*)S != NULL) goto foundit;
2406 S = (UInt32) lookupSymbol( symbol );
2407 if ((void*)S != NULL) goto foundit;
2408 zapTrailingAtSign ( symbol );
2409 S = (UInt32) lookupLocalSymbol( oc, symbol );
2410 if ((void*)S != NULL) goto foundit;
2411 S = (UInt32) lookupSymbol( symbol );
2412 if ((void*)S != NULL) goto foundit;
2413 /* Newline first because the interactive linker has printed "linking..." */
2414 errorBelch("\n%s: unknown symbol `%s'", oc->fileName, symbol);
2418 checkProddableBlock(oc, pP);
2419 switch (reltab_j->Type) {
2420 case MYIMAGE_REL_I386_DIR32:
2423 case MYIMAGE_REL_I386_REL32:
2424 /* Tricky. We have to insert a displacement at
2425 pP which, when added to the PC for the _next_
2426 insn, gives the address of the target (S).
2427 Problem is to know the address of the next insn
2428 when we only know pP. We assume that this
2429 literal field is always the last in the insn,
2430 so that the address of the next insn is pP+4
2431 -- hence the constant 4.
2432 Also I don't know if A should be added, but so
2433 far it has always been zero.
2435 SOF 05/2005: 'A' (old contents of *pP) have been observed
2436 to contain values other than zero (the 'wx' object file
2437 that came with wxhaskell-0.9.4; dunno how it was compiled..).
2438 So, add displacement to old value instead of asserting
2439 A to be zero. Fixes wxhaskell-related crashes, and no other
2440 ill effects have been observed.
2442 Update: the reason why we're seeing these more elaborate
2443 relocations is due to a switch in how the NCG compiles SRTs
2444 and offsets to them from info tables. SRTs live in .(ro)data,
2445 while info tables live in .text, causing GAS to emit REL32/DISP32
2446 relocations with non-zero values. Adding the displacement is
2447 the right thing to do.
2449 *pP = S - ((UInt32)pP) - 4 + A;
2452 debugBelch("%s: unhandled PEi386 relocation type %d",
2453 oc->fileName, reltab_j->Type);
2460 IF_DEBUG(linker, debugBelch("completed %s", oc->fileName));
2464 #endif /* defined(OBJFORMAT_PEi386) */
2467 /* --------------------------------------------------------------------------
2469 * ------------------------------------------------------------------------*/
2471 #if defined(OBJFORMAT_ELF)
2476 #if defined(sparc_HOST_ARCH)
2477 # define ELF_TARGET_SPARC /* Used inside <elf.h> */
2478 #elif defined(i386_HOST_ARCH)
2479 # define ELF_TARGET_386 /* Used inside <elf.h> */
2480 #elif defined(x86_64_HOST_ARCH)
2481 # define ELF_TARGET_X64_64
2483 #elif defined (ia64_HOST_ARCH)
2484 # define ELF_TARGET_IA64 /* Used inside <elf.h> */
2486 # define ELF_FUNCTION_DESC /* calling convention uses function descriptors */
2487 # define ELF_NEED_GOT /* needs Global Offset Table */
2488 # define ELF_NEED_PLT /* needs Procedure Linkage Tables */
2491 #if !defined(openbsd_HOST_OS)
2494 /* openbsd elf has things in different places, with diff names */
2495 #include <elf_abi.h>
2496 #include <machine/reloc.h>
2497 #define R_386_32 RELOC_32
2498 #define R_386_PC32 RELOC_PC32
2502 * Define a set of types which can be used for both ELF32 and ELF64
2506 #define ELFCLASS ELFCLASS64
2507 #define Elf_Addr Elf64_Addr
2508 #define Elf_Word Elf64_Word
2509 #define Elf_Sword Elf64_Sword
2510 #define Elf_Ehdr Elf64_Ehdr
2511 #define Elf_Phdr Elf64_Phdr
2512 #define Elf_Shdr Elf64_Shdr
2513 #define Elf_Sym Elf64_Sym
2514 #define Elf_Rel Elf64_Rel
2515 #define Elf_Rela Elf64_Rela
2516 #define ELF_ST_TYPE ELF64_ST_TYPE
2517 #define ELF_ST_BIND ELF64_ST_BIND
2518 #define ELF_R_TYPE ELF64_R_TYPE
2519 #define ELF_R_SYM ELF64_R_SYM
2521 #define ELFCLASS ELFCLASS32
2522 #define Elf_Addr Elf32_Addr
2523 #define Elf_Word Elf32_Word
2524 #define Elf_Sword Elf32_Sword
2525 #define Elf_Ehdr Elf32_Ehdr
2526 #define Elf_Phdr Elf32_Phdr
2527 #define Elf_Shdr Elf32_Shdr
2528 #define Elf_Sym Elf32_Sym
2529 #define Elf_Rel Elf32_Rel
2530 #define Elf_Rela Elf32_Rela
2532 #define ELF_ST_TYPE ELF32_ST_TYPE
2535 #define ELF_ST_BIND ELF32_ST_BIND
2538 #define ELF_R_TYPE ELF32_R_TYPE
2541 #define ELF_R_SYM ELF32_R_SYM
2547 * Functions to allocate entries in dynamic sections. Currently we simply
2548 * preallocate a large number, and we don't check if a entry for the given
2549 * target already exists (a linear search is too slow). Ideally these
2550 * entries would be associated with symbols.
2553 /* These sizes sufficient to load HSbase + HShaskell98 + a few modules */
2554 #define GOT_SIZE 0x20000
2555 #define FUNCTION_TABLE_SIZE 0x10000
2556 #define PLT_SIZE 0x08000
2559 static Elf_Addr got[GOT_SIZE];
2560 static unsigned int gotIndex;
2561 static Elf_Addr gp_val = (Elf_Addr)got;
2564 allocateGOTEntry(Elf_Addr target)
2568 if (gotIndex >= GOT_SIZE)
2569 barf("Global offset table overflow");
2571 entry = &got[gotIndex++];
2573 return (Elf_Addr)entry;
2577 #ifdef ELF_FUNCTION_DESC
2583 static FunctionDesc functionTable[FUNCTION_TABLE_SIZE];
2584 static unsigned int functionTableIndex;
2587 allocateFunctionDesc(Elf_Addr target)
2589 FunctionDesc *entry;
2591 if (functionTableIndex >= FUNCTION_TABLE_SIZE)
2592 barf("Function table overflow");
2594 entry = &functionTable[functionTableIndex++];
2596 entry->gp = (Elf_Addr)gp_val;
2597 return (Elf_Addr)entry;
2601 copyFunctionDesc(Elf_Addr target)
2603 FunctionDesc *olddesc = (FunctionDesc *)target;
2604 FunctionDesc *newdesc;
2606 newdesc = (FunctionDesc *)allocateFunctionDesc(olddesc->ip);
2607 newdesc->gp = olddesc->gp;
2608 return (Elf_Addr)newdesc;
2613 #ifdef ia64_HOST_ARCH
2614 static void ia64_reloc_gprel22(Elf_Addr target, Elf_Addr value);
2615 static void ia64_reloc_pcrel21(Elf_Addr target, Elf_Addr value, ObjectCode *oc);
2617 static unsigned char plt_code[] =
2619 /* taken from binutils bfd/elfxx-ia64.c */
2620 0x0b, 0x78, 0x00, 0x02, 0x00, 0x24, /* [MMI] addl r15=0,r1;; */
2621 0x00, 0x41, 0x3c, 0x30, 0x28, 0xc0, /* ld8 r16=[r15],8 */
2622 0x01, 0x08, 0x00, 0x84, /* mov r14=r1;; */
2623 0x11, 0x08, 0x00, 0x1e, 0x18, 0x10, /* [MIB] ld8 r1=[r15] */
2624 0x60, 0x80, 0x04, 0x80, 0x03, 0x00, /* mov b6=r16 */
2625 0x60, 0x00, 0x80, 0x00 /* br.few b6;; */
2628 /* If we can't get to the function descriptor via gp, take a local copy of it */
2629 #define PLT_RELOC(code, target) { \
2630 Elf64_Sxword rel_value = target - gp_val; \
2631 if ((rel_value > 0x1fffff) || (rel_value < -0x1fffff)) \
2632 ia64_reloc_gprel22((Elf_Addr)code, copyFunctionDesc(target)); \
2634 ia64_reloc_gprel22((Elf_Addr)code, target); \
2639 unsigned char code[sizeof(plt_code)];
2643 allocatePLTEntry(Elf_Addr target, ObjectCode *oc)
2645 PLTEntry *plt = (PLTEntry *)oc->plt;
2648 if (oc->pltIndex >= PLT_SIZE)
2649 barf("Procedure table overflow");
2651 entry = &plt[oc->pltIndex++];
2652 memcpy(entry->code, plt_code, sizeof(entry->code));
2653 PLT_RELOC(entry->code, target);
2654 return (Elf_Addr)entry;
2660 return (PLT_SIZE * sizeof(PLTEntry));
2665 #if x86_64_HOST_ARCH
2666 // On x86_64, 32-bit relocations are often used, which requires that
2667 // we can resolve a symbol to a 32-bit offset. However, shared
2668 // libraries are placed outside the 2Gb area, which leaves us with a
2669 // problem when we need to give a 32-bit offset to a symbol in a
2672 // For a function symbol, we can allocate a bounce sequence inside the
2673 // 2Gb area and resolve the symbol to this. The bounce sequence is
2674 // simply a long jump instruction to the real location of the symbol.
2676 // For data references, we're screwed.
2679 unsigned char jmp[8]; /* 6 byte instruction: jmpq *0x00000002(%rip) */
2683 #define X86_64_BB_SIZE 1024
2685 static x86_64_bounce *x86_64_bounce_buffer = NULL;
2686 static nat x86_64_bb_next_off;
2689 x86_64_high_symbol( char *lbl, void *addr )
2691 x86_64_bounce *bounce;
2693 if ( x86_64_bounce_buffer == NULL ||
2694 x86_64_bb_next_off >= X86_64_BB_SIZE ) {
2695 x86_64_bounce_buffer =
2696 mmap(NULL, X86_64_BB_SIZE * sizeof(x86_64_bounce),
2697 PROT_EXEC|PROT_READ|PROT_WRITE,
2698 MAP_PRIVATE|MAP_32BIT|MAP_ANONYMOUS, -1, 0);
2699 if (x86_64_bounce_buffer == MAP_FAILED) {
2700 barf("x86_64_high_symbol: mmap failed");
2702 x86_64_bb_next_off = 0;
2704 bounce = &x86_64_bounce_buffer[x86_64_bb_next_off];
2705 bounce->jmp[0] = 0xff;
2706 bounce->jmp[1] = 0x25;
2707 bounce->jmp[2] = 0x02;
2708 bounce->jmp[3] = 0x00;
2709 bounce->jmp[4] = 0x00;
2710 bounce->jmp[5] = 0x00;
2711 bounce->addr = addr;
2712 x86_64_bb_next_off++;
2714 IF_DEBUG(linker, debugBelch("x86_64: allocated bounce entry for %s->%p at %p\n",
2715 lbl, addr, bounce));
2717 insertStrHashTable(symhash, lbl, bounce);
2724 * Generic ELF functions
2728 findElfSection ( void* objImage, Elf_Word sh_type )
2730 char* ehdrC = (char*)objImage;
2731 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2732 Elf_Shdr* shdr = (Elf_Shdr*)(ehdrC + ehdr->e_shoff);
2733 char* sh_strtab = ehdrC + shdr[ehdr->e_shstrndx].sh_offset;
2737 for (i = 0; i < ehdr->e_shnum; i++) {
2738 if (shdr[i].sh_type == sh_type
2739 /* Ignore the section header's string table. */
2740 && i != ehdr->e_shstrndx
2741 /* Ignore string tables named .stabstr, as they contain
2743 && 0 != memcmp(".stabstr", sh_strtab + shdr[i].sh_name, 8)
2745 ptr = ehdrC + shdr[i].sh_offset;
2752 #if defined(ia64_HOST_ARCH)
2754 findElfSegment ( void* objImage, Elf_Addr vaddr )
2756 char* ehdrC = (char*)objImage;
2757 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2758 Elf_Phdr* phdr = (Elf_Phdr*)(ehdrC + ehdr->e_phoff);
2759 Elf_Addr segaddr = 0;
2762 for (i = 0; i < ehdr->e_phnum; i++) {
2763 segaddr = phdr[i].p_vaddr;
2764 if ((vaddr >= segaddr) && (vaddr < segaddr + phdr[i].p_memsz))
2772 ocVerifyImage_ELF ( ObjectCode* oc )
2776 int i, j, nent, nstrtab, nsymtabs;
2780 char* ehdrC = (char*)(oc->image);
2781 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2783 if (ehdr->e_ident[EI_MAG0] != ELFMAG0 ||
2784 ehdr->e_ident[EI_MAG1] != ELFMAG1 ||
2785 ehdr->e_ident[EI_MAG2] != ELFMAG2 ||
2786 ehdr->e_ident[EI_MAG3] != ELFMAG3) {
2787 errorBelch("%s: not an ELF object", oc->fileName);
2791 if (ehdr->e_ident[EI_CLASS] != ELFCLASS) {
2792 errorBelch("%s: unsupported ELF format", oc->fileName);
2796 if (ehdr->e_ident[EI_DATA] == ELFDATA2LSB) {
2797 IF_DEBUG(linker,debugBelch( "Is little-endian\n" ));
2799 if (ehdr->e_ident[EI_DATA] == ELFDATA2MSB) {
2800 IF_DEBUG(linker,debugBelch( "Is big-endian\n" ));
2802 errorBelch("%s: unknown endiannness", oc->fileName);
2806 if (ehdr->e_type != ET_REL) {
2807 errorBelch("%s: not a relocatable object (.o) file", oc->fileName);
2810 IF_DEBUG(linker, debugBelch( "Is a relocatable object (.o) file\n" ));
2812 IF_DEBUG(linker,debugBelch( "Architecture is " ));
2813 switch (ehdr->e_machine) {
2814 case EM_386: IF_DEBUG(linker,debugBelch( "x86" )); break;
2815 #ifdef EM_SPARC32PLUS
2816 case EM_SPARC32PLUS:
2818 case EM_SPARC: IF_DEBUG(linker,debugBelch( "sparc" )); break;
2820 case EM_IA_64: IF_DEBUG(linker,debugBelch( "ia64" )); break;
2822 case EM_PPC: IF_DEBUG(linker,debugBelch( "powerpc32" )); break;
2824 case EM_X86_64: IF_DEBUG(linker,debugBelch( "x86_64" )); break;
2826 default: IF_DEBUG(linker,debugBelch( "unknown" ));
2827 errorBelch("%s: unknown architecture", oc->fileName);
2831 IF_DEBUG(linker,debugBelch(
2832 "\nSection header table: start %ld, n_entries %d, ent_size %d\n",
2833 (long)ehdr->e_shoff, ehdr->e_shnum, ehdr->e_shentsize ));
2835 ASSERT (ehdr->e_shentsize == sizeof(Elf_Shdr));
2837 shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
2839 if (ehdr->e_shstrndx == SHN_UNDEF) {
2840 errorBelch("%s: no section header string table", oc->fileName);
2843 IF_DEBUG(linker,debugBelch( "Section header string table is section %d\n",
2845 sh_strtab = ehdrC + shdr[ehdr->e_shstrndx].sh_offset;
2848 for (i = 0; i < ehdr->e_shnum; i++) {
2849 IF_DEBUG(linker,debugBelch("%2d: ", i ));
2850 IF_DEBUG(linker,debugBelch("type=%2d ", (int)shdr[i].sh_type ));
2851 IF_DEBUG(linker,debugBelch("size=%4d ", (int)shdr[i].sh_size ));
2852 IF_DEBUG(linker,debugBelch("offs=%4d ", (int)shdr[i].sh_offset ));
2853 IF_DEBUG(linker,debugBelch(" (%p .. %p) ",
2854 ehdrC + shdr[i].sh_offset,
2855 ehdrC + shdr[i].sh_offset + shdr[i].sh_size - 1));
2857 if (shdr[i].sh_type == SHT_REL) {
2858 IF_DEBUG(linker,debugBelch("Rel " ));
2859 } else if (shdr[i].sh_type == SHT_RELA) {
2860 IF_DEBUG(linker,debugBelch("RelA " ));
2862 IF_DEBUG(linker,debugBelch(" "));
2865 IF_DEBUG(linker,debugBelch("sname=%s\n", sh_strtab + shdr[i].sh_name ));
2869 IF_DEBUG(linker,debugBelch( "\nString tables" ));
2872 for (i = 0; i < ehdr->e_shnum; i++) {
2873 if (shdr[i].sh_type == SHT_STRTAB
2874 /* Ignore the section header's string table. */
2875 && i != ehdr->e_shstrndx
2876 /* Ignore string tables named .stabstr, as they contain
2878 && 0 != memcmp(".stabstr", sh_strtab + shdr[i].sh_name, 8)
2880 IF_DEBUG(linker,debugBelch(" section %d is a normal string table", i ));
2881 strtab = ehdrC + shdr[i].sh_offset;
2886 errorBelch("%s: no string tables, or too many", oc->fileName);
2891 IF_DEBUG(linker,debugBelch( "\nSymbol tables" ));
2892 for (i = 0; i < ehdr->e_shnum; i++) {
2893 if (shdr[i].sh_type != SHT_SYMTAB) continue;
2894 IF_DEBUG(linker,debugBelch( "section %d is a symbol table\n", i ));
2896 stab = (Elf_Sym*) (ehdrC + shdr[i].sh_offset);
2897 nent = shdr[i].sh_size / sizeof(Elf_Sym);
2898 IF_DEBUG(linker,debugBelch( " number of entries is apparently %d (%ld rem)\n",
2900 (long)shdr[i].sh_size % sizeof(Elf_Sym)
2902 if (0 != shdr[i].sh_size % sizeof(Elf_Sym)) {
2903 errorBelch("%s: non-integral number of symbol table entries", oc->fileName);
2906 for (j = 0; j < nent; j++) {
2907 IF_DEBUG(linker,debugBelch(" %2d ", j ));
2908 IF_DEBUG(linker,debugBelch(" sec=%-5d size=%-3d val=%5p ",
2909 (int)stab[j].st_shndx,
2910 (int)stab[j].st_size,
2911 (char*)stab[j].st_value ));
2913 IF_DEBUG(linker,debugBelch("type=" ));
2914 switch (ELF_ST_TYPE(stab[j].st_info)) {
2915 case STT_NOTYPE: IF_DEBUG(linker,debugBelch("notype " )); break;
2916 case STT_OBJECT: IF_DEBUG(linker,debugBelch("object " )); break;
2917 case STT_FUNC : IF_DEBUG(linker,debugBelch("func " )); break;
2918 case STT_SECTION: IF_DEBUG(linker,debugBelch("section" )); break;
2919 case STT_FILE: IF_DEBUG(linker,debugBelch("file " )); break;
2920 default: IF_DEBUG(linker,debugBelch("? " )); break;
2922 IF_DEBUG(linker,debugBelch(" " ));
2924 IF_DEBUG(linker,debugBelch("bind=" ));
2925 switch (ELF_ST_BIND(stab[j].st_info)) {
2926 case STB_LOCAL : IF_DEBUG(linker,debugBelch("local " )); break;
2927 case STB_GLOBAL: IF_DEBUG(linker,debugBelch("global" )); break;
2928 case STB_WEAK : IF_DEBUG(linker,debugBelch("weak " )); break;
2929 default: IF_DEBUG(linker,debugBelch("? " )); break;
2931 IF_DEBUG(linker,debugBelch(" " ));
2933 IF_DEBUG(linker,debugBelch("name=%s\n", strtab + stab[j].st_name ));
2937 if (nsymtabs == 0) {
2938 errorBelch("%s: didn't find any symbol tables", oc->fileName);
2945 static int getSectionKind_ELF( Elf_Shdr *hdr, int *is_bss )
2949 if (hdr->sh_type == SHT_PROGBITS
2950 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_EXECINSTR)) {
2951 /* .text-style section */
2952 return SECTIONKIND_CODE_OR_RODATA;
2955 if (hdr->sh_type == SHT_PROGBITS
2956 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_WRITE)) {
2957 /* .data-style section */
2958 return SECTIONKIND_RWDATA;
2961 if (hdr->sh_type == SHT_PROGBITS
2962 && (hdr->sh_flags & SHF_ALLOC) && !(hdr->sh_flags & SHF_WRITE)) {
2963 /* .rodata-style section */
2964 return SECTIONKIND_CODE_OR_RODATA;
2967 if (hdr->sh_type == SHT_NOBITS
2968 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_WRITE)) {
2969 /* .bss-style section */
2971 return SECTIONKIND_RWDATA;
2974 return SECTIONKIND_OTHER;
2979 ocGetNames_ELF ( ObjectCode* oc )
2984 char* ehdrC = (char*)(oc->image);
2985 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2986 char* strtab = findElfSection ( ehdrC, SHT_STRTAB );
2987 Elf_Shdr* shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
2989 ASSERT(symhash != NULL);
2992 errorBelch("%s: no strtab", oc->fileName);
2997 for (i = 0; i < ehdr->e_shnum; i++) {
2998 /* Figure out what kind of section it is. Logic derived from
2999 Figure 1.14 ("Special Sections") of the ELF document
3000 ("Portable Formats Specification, Version 1.1"). */
3002 SectionKind kind = getSectionKind_ELF(&shdr[i], &is_bss);
3004 if (is_bss && shdr[i].sh_size > 0) {
3005 /* This is a non-empty .bss section. Allocate zeroed space for
3006 it, and set its .sh_offset field such that
3007 ehdrC + .sh_offset == addr_of_zeroed_space. */
3008 char* zspace = stgCallocBytes(1, shdr[i].sh_size,
3009 "ocGetNames_ELF(BSS)");
3010 shdr[i].sh_offset = ((char*)zspace) - ((char*)ehdrC);
3012 debugBelch("BSS section at 0x%x, size %d\n",
3013 zspace, shdr[i].sh_size);
3017 /* fill in the section info */
3018 if (kind != SECTIONKIND_OTHER && shdr[i].sh_size > 0) {
3019 addProddableBlock(oc, ehdrC + shdr[i].sh_offset, shdr[i].sh_size);
3020 addSection(oc, kind, ehdrC + shdr[i].sh_offset,
3021 ehdrC + shdr[i].sh_offset + shdr[i].sh_size - 1);
3024 if (shdr[i].sh_type != SHT_SYMTAB) continue;
3026 /* copy stuff into this module's object symbol table */
3027 stab = (Elf_Sym*) (ehdrC + shdr[i].sh_offset);
3028 nent = shdr[i].sh_size / sizeof(Elf_Sym);
3030 oc->n_symbols = nent;
3031 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
3032 "ocGetNames_ELF(oc->symbols)");
3034 for (j = 0; j < nent; j++) {
3036 char isLocal = FALSE; /* avoids uninit-var warning */
3038 char* nm = strtab + stab[j].st_name;
3039 int secno = stab[j].st_shndx;
3041 /* Figure out if we want to add it; if so, set ad to its
3042 address. Otherwise leave ad == NULL. */
3044 if (secno == SHN_COMMON) {
3046 ad = stgCallocBytes(1, stab[j].st_size, "ocGetNames_ELF(COMMON)");
3048 debugBelch("COMMON symbol, size %d name %s\n",
3049 stab[j].st_size, nm);
3051 /* Pointless to do addProddableBlock() for this area,
3052 since the linker should never poke around in it. */
3055 if ( ( ELF_ST_BIND(stab[j].st_info)==STB_GLOBAL
3056 || ELF_ST_BIND(stab[j].st_info)==STB_LOCAL
3058 /* and not an undefined symbol */
3059 && stab[j].st_shndx != SHN_UNDEF
3060 /* and not in a "special section" */
3061 && stab[j].st_shndx < SHN_LORESERVE
3063 /* and it's a not a section or string table or anything silly */
3064 ( ELF_ST_TYPE(stab[j].st_info)==STT_FUNC ||
3065 ELF_ST_TYPE(stab[j].st_info)==STT_OBJECT ||
3066 ELF_ST_TYPE(stab[j].st_info)==STT_NOTYPE
3069 /* Section 0 is the undefined section, hence > and not >=. */
3070 ASSERT(secno > 0 && secno < ehdr->e_shnum);
3072 if (shdr[secno].sh_type == SHT_NOBITS) {
3073 debugBelch(" BSS symbol, size %d off %d name %s\n",
3074 stab[j].st_size, stab[j].st_value, nm);
3077 ad = ehdrC + shdr[ secno ].sh_offset + stab[j].st_value;
3078 if (ELF_ST_BIND(stab[j].st_info)==STB_LOCAL) {
3081 #ifdef ELF_FUNCTION_DESC
3082 /* dlsym() and the initialisation table both give us function
3083 * descriptors, so to be consistent we store function descriptors
3084 * in the symbol table */
3085 if (ELF_ST_TYPE(stab[j].st_info) == STT_FUNC)
3086 ad = (char *)allocateFunctionDesc((Elf_Addr)ad);
3088 IF_DEBUG(linker,debugBelch( "addOTabName(GLOB): %10p %s %s",
3089 ad, oc->fileName, nm ));
3094 /* And the decision is ... */
3098 oc->symbols[j] = nm;
3101 /* Ignore entirely. */
3103 ghciInsertStrHashTable(oc->fileName, symhash, nm, ad);
3107 IF_DEBUG(linker,debugBelch( "skipping `%s'\n",
3108 strtab + stab[j].st_name ));
3111 "skipping bind = %d, type = %d, shndx = %d `%s'\n",
3112 (int)ELF_ST_BIND(stab[j].st_info),
3113 (int)ELF_ST_TYPE(stab[j].st_info),
3114 (int)stab[j].st_shndx,
3115 strtab + stab[j].st_name
3118 oc->symbols[j] = NULL;
3127 /* Do ELF relocations which lack an explicit addend. All x86-linux
3128 relocations appear to be of this form. */
3130 do_Elf_Rel_relocations ( ObjectCode* oc, char* ehdrC,
3131 Elf_Shdr* shdr, int shnum,
3132 Elf_Sym* stab, char* strtab )
3137 Elf_Rel* rtab = (Elf_Rel*) (ehdrC + shdr[shnum].sh_offset);
3138 int nent = shdr[shnum].sh_size / sizeof(Elf_Rel);
3139 int target_shndx = shdr[shnum].sh_info;
3140 int symtab_shndx = shdr[shnum].sh_link;
3142 stab = (Elf_Sym*) (ehdrC + shdr[ symtab_shndx ].sh_offset);
3143 targ = (Elf_Word*)(ehdrC + shdr[ target_shndx ].sh_offset);
3144 IF_DEBUG(linker,debugBelch( "relocations for section %d using symtab %d\n",
3145 target_shndx, symtab_shndx ));
3147 /* Skip sections that we're not interested in. */
3150 SectionKind kind = getSectionKind_ELF(&shdr[target_shndx], &is_bss);
3151 if (kind == SECTIONKIND_OTHER) {
3152 IF_DEBUG(linker,debugBelch( "skipping (target section not loaded)"));
3157 for (j = 0; j < nent; j++) {
3158 Elf_Addr offset = rtab[j].r_offset;
3159 Elf_Addr info = rtab[j].r_info;
3161 Elf_Addr P = ((Elf_Addr)targ) + offset;
3162 Elf_Word* pP = (Elf_Word*)P;
3167 StgStablePtr stablePtr;
3170 IF_DEBUG(linker,debugBelch( "Rel entry %3d is raw(%6p %6p)",
3171 j, (void*)offset, (void*)info ));
3173 IF_DEBUG(linker,debugBelch( " ZERO" ));
3176 Elf_Sym sym = stab[ELF_R_SYM(info)];
3177 /* First see if it is a local symbol. */
3178 if (ELF_ST_BIND(sym.st_info) == STB_LOCAL) {
3179 /* Yes, so we can get the address directly from the ELF symbol
3181 symbol = sym.st_name==0 ? "(noname)" : strtab+sym.st_name;
3183 (ehdrC + shdr[ sym.st_shndx ].sh_offset
3184 + stab[ELF_R_SYM(info)].st_value);
3187 symbol = strtab + sym.st_name;
3188 stablePtr = (StgStablePtr)lookupHashTable(stablehash, (StgWord)symbol);
3189 if (NULL == stablePtr) {
3190 /* No, so look up the name in our global table. */
3191 S_tmp = lookupSymbol( symbol );
3192 S = (Elf_Addr)S_tmp;
3194 stableVal = deRefStablePtr( stablePtr );
3196 S = (Elf_Addr)S_tmp;
3200 errorBelch("%s: unknown symbol `%s'", oc->fileName, symbol);
3203 IF_DEBUG(linker,debugBelch( "`%s' resolves to %p\n", symbol, (void*)S ));
3206 IF_DEBUG(linker,debugBelch( "Reloc: P = %p S = %p A = %p\n",
3207 (void*)P, (void*)S, (void*)A ));
3208 checkProddableBlock ( oc, pP );
3212 switch (ELF_R_TYPE(info)) {
3213 # ifdef i386_HOST_ARCH
3214 case R_386_32: *pP = value; break;
3215 case R_386_PC32: *pP = value - P; break;
3218 errorBelch("%s: unhandled ELF relocation(Rel) type %lu\n",
3219 oc->fileName, (lnat)ELF_R_TYPE(info));
3227 /* Do ELF relocations for which explicit addends are supplied.
3228 sparc-solaris relocations appear to be of this form. */
3230 do_Elf_Rela_relocations ( ObjectCode* oc, char* ehdrC,
3231 Elf_Shdr* shdr, int shnum,
3232 Elf_Sym* stab, char* strtab )
3235 char *symbol = NULL;
3237 Elf_Rela* rtab = (Elf_Rela*) (ehdrC + shdr[shnum].sh_offset);
3238 int nent = shdr[shnum].sh_size / sizeof(Elf_Rela);
3239 int target_shndx = shdr[shnum].sh_info;
3240 int symtab_shndx = shdr[shnum].sh_link;
3242 stab = (Elf_Sym*) (ehdrC + shdr[ symtab_shndx ].sh_offset);
3243 targ = (Elf_Addr) (ehdrC + shdr[ target_shndx ].sh_offset);
3244 IF_DEBUG(linker,debugBelch( "relocations for section %d using symtab %d\n",
3245 target_shndx, symtab_shndx ));
3247 for (j = 0; j < nent; j++) {
3248 #if defined(DEBUG) || defined(sparc_HOST_ARCH) || defined(ia64_HOST_ARCH) || defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH)
3249 /* This #ifdef only serves to avoid unused-var warnings. */
3250 Elf_Addr offset = rtab[j].r_offset;
3251 Elf_Addr P = targ + offset;
3253 Elf_Addr info = rtab[j].r_info;
3254 Elf_Addr A = rtab[j].r_addend;
3258 # if defined(sparc_HOST_ARCH)
3259 Elf_Word* pP = (Elf_Word*)P;
3261 # elif defined(ia64_HOST_ARCH)
3262 Elf64_Xword *pP = (Elf64_Xword *)P;
3264 # elif defined(powerpc_HOST_ARCH)
3268 IF_DEBUG(linker,debugBelch( "Rel entry %3d is raw(%6p %6p %6p) ",
3269 j, (void*)offset, (void*)info,
3272 IF_DEBUG(linker,debugBelch( " ZERO" ));
3275 Elf_Sym sym = stab[ELF_R_SYM(info)];
3276 /* First see if it is a local symbol. */
3277 if (ELF_ST_BIND(sym.st_info) == STB_LOCAL) {
3278 /* Yes, so we can get the address directly from the ELF symbol
3280 symbol = sym.st_name==0 ? "(noname)" : strtab+sym.st_name;
3282 (ehdrC + shdr[ sym.st_shndx ].sh_offset
3283 + stab[ELF_R_SYM(info)].st_value);
3284 #ifdef ELF_FUNCTION_DESC
3285 /* Make a function descriptor for this function */
3286 if (S && ELF_ST_TYPE(sym.st_info) == STT_FUNC) {
3287 S = allocateFunctionDesc(S + A);
3292 /* No, so look up the name in our global table. */
3293 symbol = strtab + sym.st_name;
3294 S_tmp = lookupSymbol( symbol );
3295 S = (Elf_Addr)S_tmp;
3297 #ifdef ELF_FUNCTION_DESC
3298 /* If a function, already a function descriptor - we would
3299 have to copy it to add an offset. */
3300 if (S && (ELF_ST_TYPE(sym.st_info) == STT_FUNC) && (A != 0))
3301 errorBelch("%s: function %s with addend %p", oc->fileName, symbol, (void *)A);
3305 errorBelch("%s: unknown symbol `%s'", oc->fileName, symbol);
3308 IF_DEBUG(linker,debugBelch( "`%s' resolves to %p", symbol, (void*)S ));
3311 IF_DEBUG(linker,debugBelch("Reloc: P = %p S = %p A = %p\n",
3312 (void*)P, (void*)S, (void*)A ));
3313 /* checkProddableBlock ( oc, (void*)P ); */
3317 switch (ELF_R_TYPE(info)) {
3318 # if defined(sparc_HOST_ARCH)
3319 case R_SPARC_WDISP30:
3320 w1 = *pP & 0xC0000000;
3321 w2 = (Elf_Word)((value - P) >> 2);
3322 ASSERT((w2 & 0xC0000000) == 0);
3327 w1 = *pP & 0xFFC00000;
3328 w2 = (Elf_Word)(value >> 10);
3329 ASSERT((w2 & 0xFFC00000) == 0);
3335 w2 = (Elf_Word)(value & 0x3FF);
3336 ASSERT((w2 & ~0x3FF) == 0);
3340 /* According to the Sun documentation:
3342 This relocation type resembles R_SPARC_32, except it refers to an
3343 unaligned word. That is, the word to be relocated must be treated
3344 as four separate bytes with arbitrary alignment, not as a word
3345 aligned according to the architecture requirements.
3347 (JRS: which means that freeloading on the R_SPARC_32 case
3348 is probably wrong, but hey ...)
3352 w2 = (Elf_Word)value;
3355 # elif defined(ia64_HOST_ARCH)
3356 case R_IA64_DIR64LSB:
3357 case R_IA64_FPTR64LSB:
3360 case R_IA64_PCREL64LSB:
3363 case R_IA64_SEGREL64LSB:
3364 addr = findElfSegment(ehdrC, value);
3367 case R_IA64_GPREL22:
3368 ia64_reloc_gprel22(P, value);
3370 case R_IA64_LTOFF22:
3371 case R_IA64_LTOFF22X:
3372 case R_IA64_LTOFF_FPTR22:
3373 addr = allocateGOTEntry(value);
3374 ia64_reloc_gprel22(P, addr);
3376 case R_IA64_PCREL21B:
3377 ia64_reloc_pcrel21(P, S, oc);
3380 /* This goes with R_IA64_LTOFF22X and points to the load to
3381 * convert into a move. We don't implement relaxation. */
3383 # elif defined(powerpc_HOST_ARCH)
3384 case R_PPC_ADDR16_LO:
3385 *(Elf32_Half*) P = value;
3388 case R_PPC_ADDR16_HI:
3389 *(Elf32_Half*) P = value >> 16;
3392 case R_PPC_ADDR16_HA:
3393 *(Elf32_Half*) P = (value + 0x8000) >> 16;
3397 *(Elf32_Word *) P = value;
3401 *(Elf32_Word *) P = value - P;
3407 if( delta << 6 >> 6 != delta )
3409 value = makeJumpIsland( oc, ELF_R_SYM(info), value );
3412 if( value == 0 || delta << 6 >> 6 != delta )
3414 barf( "Unable to make ppcJumpIsland for #%d",
3420 *(Elf_Word *) P = (*(Elf_Word *) P & 0xfc000003)
3421 | (delta & 0x3fffffc);
3425 #if x86_64_HOST_ARCH
3427 *(Elf64_Xword *)P = value;
3432 StgInt64 off = value - P;
3433 if (off >= 0x7fffffffL || off < -0x80000000L) {
3434 barf("R_X86_64_PC32 relocation out of range: %s = %p",
3437 *(Elf64_Word *)P = (Elf64_Word)off;
3442 if (value >= 0x7fffffffL) {
3443 barf("R_X86_64_32 relocation out of range: %s = %p\n",
3446 *(Elf64_Word *)P = (Elf64_Word)value;
3450 if ((StgInt64)value > 0x7fffffffL || (StgInt64)value < -0x80000000L) {
3451 barf("R_X86_64_32S relocation out of range: %s = %p\n",
3454 *(Elf64_Sword *)P = (Elf64_Sword)value;
3459 errorBelch("%s: unhandled ELF relocation(RelA) type %lu\n",
3460 oc->fileName, (lnat)ELF_R_TYPE(info));
3469 ocResolve_ELF ( ObjectCode* oc )
3473 Elf_Sym* stab = NULL;
3474 char* ehdrC = (char*)(oc->image);
3475 Elf_Ehdr* ehdr = (Elf_Ehdr*) ehdrC;
3476 Elf_Shdr* shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
3478 /* first find "the" symbol table */
3479 stab = (Elf_Sym*) findElfSection ( ehdrC, SHT_SYMTAB );
3481 /* also go find the string table */
3482 strtab = findElfSection ( ehdrC, SHT_STRTAB );
3484 if (stab == NULL || strtab == NULL) {
3485 errorBelch("%s: can't find string or symbol table", oc->fileName);
3489 /* Process the relocation sections. */
3490 for (shnum = 0; shnum < ehdr->e_shnum; shnum++) {
3491 if (shdr[shnum].sh_type == SHT_REL) {
3492 ok = do_Elf_Rel_relocations ( oc, ehdrC, shdr,
3493 shnum, stab, strtab );
3497 if (shdr[shnum].sh_type == SHT_RELA) {
3498 ok = do_Elf_Rela_relocations ( oc, ehdrC, shdr,
3499 shnum, stab, strtab );
3504 /* Free the local symbol table; we won't need it again. */
3505 freeHashTable(oc->lochash, NULL);
3508 #if defined(powerpc_HOST_ARCH)
3509 ocFlushInstructionCache( oc );
3517 * Instructions are 41 bits long, packed into 128 bit bundles with a 5-bit template
3518 * at the front. The following utility functions pack and unpack instructions, and
3519 * take care of the most common relocations.
3522 #ifdef ia64_HOST_ARCH
3525 ia64_extract_instruction(Elf64_Xword *target)
3528 int slot = (Elf_Addr)target & 3;
3529 target = (Elf_Addr)target & ~3;
3537 return ((w1 >> 5) & 0x1ffffffffff);
3539 return (w1 >> 46) | ((w2 & 0x7fffff) << 18);
3543 barf("ia64_extract_instruction: invalid slot %p", target);
3548 ia64_deposit_instruction(Elf64_Xword *target, Elf64_Xword value)
3550 int slot = (Elf_Addr)target & 3;
3551 target = (Elf_Addr)target & ~3;
3556 *target |= value << 5;
3559 *target |= value << 46;
3560 *(target+1) |= value >> 18;
3563 *(target+1) |= value << 23;
3569 ia64_reloc_gprel22(Elf_Addr target, Elf_Addr value)
3571 Elf64_Xword instruction;
3572 Elf64_Sxword rel_value;
3574 rel_value = value - gp_val;
3575 if ((rel_value > 0x1fffff) || (rel_value < -0x1fffff))
3576 barf("GP-relative data out of range (address = 0x%lx, gp = 0x%lx)", value, gp_val);
3578 instruction = ia64_extract_instruction((Elf64_Xword *)target);
3579 instruction |= (((rel_value >> 0) & 0x07f) << 13) /* imm7b */
3580 | (((rel_value >> 7) & 0x1ff) << 27) /* imm9d */
3581 | (((rel_value >> 16) & 0x01f) << 22) /* imm5c */
3582 | ((Elf64_Xword)(rel_value < 0) << 36); /* s */
3583 ia64_deposit_instruction((Elf64_Xword *)target, instruction);
3587 ia64_reloc_pcrel21(Elf_Addr target, Elf_Addr value, ObjectCode *oc)
3589 Elf64_Xword instruction;
3590 Elf64_Sxword rel_value;
3593 entry = allocatePLTEntry(value, oc);
3595 rel_value = (entry >> 4) - (target >> 4);
3596 if ((rel_value > 0xfffff) || (rel_value < -0xfffff))
3597 barf("PLT entry too far away (entry = 0x%lx, target = 0x%lx)", entry, target);
3599 instruction = ia64_extract_instruction((Elf64_Xword *)target);
3600 instruction |= ((rel_value & 0xfffff) << 13) /* imm20b */
3601 | ((Elf64_Xword)(rel_value < 0) << 36); /* s */
3602 ia64_deposit_instruction((Elf64_Xword *)target, instruction);
3608 * PowerPC ELF specifics
3611 #ifdef powerpc_HOST_ARCH
3613 static int ocAllocateJumpIslands_ELF( ObjectCode *oc )
3619 ehdr = (Elf_Ehdr *) oc->image;
3620 shdr = (Elf_Shdr *) ( ((char *)oc->image) + ehdr->e_shoff );
3622 for( i = 0; i < ehdr->e_shnum; i++ )
3623 if( shdr[i].sh_type == SHT_SYMTAB )
3626 if( i == ehdr->e_shnum )
3628 errorBelch( "This ELF file contains no symtab" );
3632 if( shdr[i].sh_entsize != sizeof( Elf_Sym ) )
3634 errorBelch( "The entry size (%d) of the symtab isn't %d\n",
3635 shdr[i].sh_entsize, sizeof( Elf_Sym ) );
3640 return ocAllocateJumpIslands( oc, shdr[i].sh_size / sizeof( Elf_Sym ), 0 );
3643 #endif /* powerpc */
3647 /* --------------------------------------------------------------------------
3649 * ------------------------------------------------------------------------*/
3651 #if defined(OBJFORMAT_MACHO)
3654 Support for MachO linking on Darwin/MacOS X
3655 by Wolfgang Thaller (wolfgang.thaller@gmx.net)
3657 I hereby formally apologize for the hackish nature of this code.
3658 Things that need to be done:
3659 *) implement ocVerifyImage_MachO
3660 *) add still more sanity checks.
3663 #ifdef powerpc_HOST_ARCH
3664 static int ocAllocateJumpIslands_MachO(ObjectCode* oc)
3666 struct mach_header *header = (struct mach_header *) oc->image;
3667 struct load_command *lc = (struct load_command *) (header + 1);
3670 for( i = 0; i < header->ncmds; i++ )
3672 if( lc->cmd == LC_SYMTAB )
3674 // Find out the first and last undefined external
3675 // symbol, so we don't have to allocate too many
3677 struct symtab_command *symLC = (struct symtab_command *) lc;
3678 unsigned min = symLC->nsyms, max = 0;
3679 struct nlist *nlist =
3680 symLC ? (struct nlist*) ((char*) oc->image + symLC->symoff)
3682 for(i=0;i<symLC->nsyms;i++)
3684 if(nlist[i].n_type & N_STAB)
3686 else if(nlist[i].n_type & N_EXT)
3688 if((nlist[i].n_type & N_TYPE) == N_UNDF
3689 && (nlist[i].n_value == 0))
3699 return ocAllocateJumpIslands(oc, max - min + 1, min);
3704 lc = (struct load_command *) ( ((char *)lc) + lc->cmdsize );
3706 return ocAllocateJumpIslands(oc,0,0);
3710 static int ocVerifyImage_MachO(ObjectCode* oc STG_UNUSED)
3712 // FIXME: do some verifying here
3716 static int resolveImports(
3719 struct symtab_command *symLC,
3720 struct section *sect, // ptr to lazy or non-lazy symbol pointer section
3721 unsigned long *indirectSyms,
3722 struct nlist *nlist)
3725 size_t itemSize = 4;
3728 int isJumpTable = 0;
3729 if(!strcmp(sect->sectname,"__jump_table"))
3733 ASSERT(sect->reserved2 == itemSize);
3737 for(i=0; i*itemSize < sect->size;i++)
3739 // according to otool, reserved1 contains the first index into the indirect symbol table
3740 struct nlist *symbol = &nlist[indirectSyms[sect->reserved1+i]];
3741 char *nm = image + symLC->stroff + symbol->n_un.n_strx;
3744 if((symbol->n_type & N_TYPE) == N_UNDF
3745 && (symbol->n_type & N_EXT) && (symbol->n_value != 0))
3746 addr = (void*) (symbol->n_value);
3747 else if((addr = lookupLocalSymbol(oc,nm)) != NULL)
3750 addr = lookupSymbol(nm);
3753 errorBelch("\n%s: unknown symbol `%s'", oc->fileName, nm);
3761 checkProddableBlock(oc,image + sect->offset + i*itemSize);
3762 *(image + sect->offset + i*itemSize) = 0xe9; // jmp
3763 *(unsigned*)(image + sect->offset + i*itemSize + 1)
3764 = (char*)addr - (image + sect->offset + i*itemSize + 5);
3769 checkProddableBlock(oc,((void**)(image + sect->offset)) + i);
3770 ((void**)(image + sect->offset))[i] = addr;
3777 static unsigned long relocateAddress(
3780 struct section* sections,
3781 unsigned long address)
3784 for(i = 0; i < nSections; i++)
3786 if(sections[i].addr <= address
3787 && address < sections[i].addr + sections[i].size)
3789 return (unsigned long)oc->image
3790 + sections[i].offset + address - sections[i].addr;
3793 barf("Invalid Mach-O file:"
3794 "Address out of bounds while relocating object file");
3798 static int relocateSection(
3801 struct symtab_command *symLC, struct nlist *nlist,
3802 int nSections, struct section* sections, struct section *sect)
3804 struct relocation_info *relocs;
3807 if(!strcmp(sect->sectname,"__la_symbol_ptr"))
3809 else if(!strcmp(sect->sectname,"__nl_symbol_ptr"))
3811 else if(!strcmp(sect->sectname,"__la_sym_ptr2"))
3813 else if(!strcmp(sect->sectname,"__la_sym_ptr3"))
3817 relocs = (struct relocation_info*) (image + sect->reloff);
3821 if(relocs[i].r_address & R_SCATTERED)
3823 struct scattered_relocation_info *scat =
3824 (struct scattered_relocation_info*) &relocs[i];
3828 if(scat->r_length == 2)
3830 unsigned long word = 0;
3831 unsigned long* wordPtr = (unsigned long*) (image + sect->offset + scat->r_address);
3832 checkProddableBlock(oc,wordPtr);
3834 // Note on relocation types:
3835 // i386 uses the GENERIC_RELOC_* types,
3836 // while ppc uses special PPC_RELOC_* types.
3837 // *_RELOC_VANILLA and *_RELOC_PAIR have the same value
3838 // in both cases, all others are different.
3839 // Therefore, we use GENERIC_RELOC_VANILLA
3840 // and GENERIC_RELOC_PAIR instead of the PPC variants,
3841 // and use #ifdefs for the other types.
3843 // Step 1: Figure out what the relocated value should be
3844 if(scat->r_type == GENERIC_RELOC_VANILLA)
3846 word = *wordPtr + (unsigned long) relocateAddress(
3853 #ifdef powerpc_HOST_ARCH
3854 else if(scat->r_type == PPC_RELOC_SECTDIFF
3855 || scat->r_type == PPC_RELOC_LO16_SECTDIFF
3856 || scat->r_type == PPC_RELOC_HI16_SECTDIFF
3857 || scat->r_type == PPC_RELOC_HA16_SECTDIFF)
3859 else if(scat->r_type == GENERIC_RELOC_SECTDIFF)
3862 struct scattered_relocation_info *pair =
3863 (struct scattered_relocation_info*) &relocs[i+1];
3865 if(!pair->r_scattered || pair->r_type != GENERIC_RELOC_PAIR)
3866 barf("Invalid Mach-O file: "
3867 "RELOC_*_SECTDIFF not followed by RELOC_PAIR");
3869 word = (unsigned long)
3870 (relocateAddress(oc, nSections, sections, scat->r_value)
3871 - relocateAddress(oc, nSections, sections, pair->r_value));
3874 #ifdef powerpc_HOST_ARCH
3875 else if(scat->r_type == PPC_RELOC_HI16
3876 || scat->r_type == PPC_RELOC_LO16
3877 || scat->r_type == PPC_RELOC_HA16
3878 || scat->r_type == PPC_RELOC_LO14)
3879 { // these are generated by label+offset things
3880 struct relocation_info *pair = &relocs[i+1];
3881 if((pair->r_address & R_SCATTERED) || pair->r_type != PPC_RELOC_PAIR)
3882 barf("Invalid Mach-O file: "
3883 "PPC_RELOC_* not followed by PPC_RELOC_PAIR");
3885 if(scat->r_type == PPC_RELOC_LO16)
3887 word = ((unsigned short*) wordPtr)[1];
3888 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
3890 else if(scat->r_type == PPC_RELOC_LO14)
3892 barf("Unsupported Relocation: PPC_RELOC_LO14");
3893 word = ((unsigned short*) wordPtr)[1] & 0xFFFC;
3894 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
3896 else if(scat->r_type == PPC_RELOC_HI16)
3898 word = ((unsigned short*) wordPtr)[1] << 16;
3899 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF);
3901 else if(scat->r_type == PPC_RELOC_HA16)
3903 word = ((unsigned short*) wordPtr)[1] << 16;
3904 word += ((short)relocs[i+1].r_address & (short)0xFFFF);
3908 word += (unsigned long) relocateAddress(oc, nSections, sections, scat->r_value)
3915 continue; // ignore the others
3917 #ifdef powerpc_HOST_ARCH
3918 if(scat->r_type == GENERIC_RELOC_VANILLA
3919 || scat->r_type == PPC_RELOC_SECTDIFF)
3921 if(scat->r_type == GENERIC_RELOC_VANILLA
3922 || scat->r_type == GENERIC_RELOC_SECTDIFF)
3927 #ifdef powerpc_HOST_ARCH
3928 else if(scat->r_type == PPC_RELOC_LO16_SECTDIFF || scat->r_type == PPC_RELOC_LO16)
3930 ((unsigned short*) wordPtr)[1] = word & 0xFFFF;
3932 else if(scat->r_type == PPC_RELOC_HI16_SECTDIFF || scat->r_type == PPC_RELOC_HI16)
3934 ((unsigned short*) wordPtr)[1] = (word >> 16) & 0xFFFF;
3936 else if(scat->r_type == PPC_RELOC_HA16_SECTDIFF || scat->r_type == PPC_RELOC_HA16)
3938 ((unsigned short*) wordPtr)[1] = ((word >> 16) & 0xFFFF)
3939 + ((word & (1<<15)) ? 1 : 0);
3945 continue; // FIXME: I hope it's OK to ignore all the others.
3949 struct relocation_info *reloc = &relocs[i];
3950 if(reloc->r_pcrel && !reloc->r_extern)
3953 if(reloc->r_length == 2)
3955 unsigned long word = 0;
3956 #ifdef powerpc_HOST_ARCH
3957 unsigned long jumpIsland = 0;
3958 long offsetToJumpIsland = 0xBADBAD42; // initialise to bad value
3959 // to avoid warning and to catch
3963 unsigned long* wordPtr = (unsigned long*) (image + sect->offset + reloc->r_address);
3964 checkProddableBlock(oc,wordPtr);
3966 if(reloc->r_type == GENERIC_RELOC_VANILLA)
3970 #ifdef powerpc_HOST_ARCH
3971 else if(reloc->r_type == PPC_RELOC_LO16)
3973 word = ((unsigned short*) wordPtr)[1];
3974 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
3976 else if(reloc->r_type == PPC_RELOC_HI16)
3978 word = ((unsigned short*) wordPtr)[1] << 16;
3979 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF);
3981 else if(reloc->r_type == PPC_RELOC_HA16)
3983 word = ((unsigned short*) wordPtr)[1] << 16;
3984 word += ((short)relocs[i+1].r_address & (short)0xFFFF);
3986 else if(reloc->r_type == PPC_RELOC_BR24)
3989 word = (word & 0x03FFFFFC) | ((word & 0x02000000) ? 0xFC000000 : 0);
3993 if(!reloc->r_extern)
3996 sections[reloc->r_symbolnum-1].offset
3997 - sections[reloc->r_symbolnum-1].addr
4004 struct nlist *symbol = &nlist[reloc->r_symbolnum];
4005 char *nm = image + symLC->stroff + symbol->n_un.n_strx;
4006 void *symbolAddress = lookupSymbol(nm);
4009 errorBelch("\nunknown symbol `%s'", nm);
4015 #ifdef powerpc_HOST_ARCH
4016 // In the .o file, this should be a relative jump to NULL
4017 // and we'll change it to a relative jump to the symbol
4018 ASSERT(-word == reloc->r_address);
4019 jumpIsland = makeJumpIsland(oc,reloc->r_symbolnum,(unsigned long) symbolAddress);
4022 offsetToJumpIsland = word + jumpIsland
4023 - (((long)image) + sect->offset - sect->addr);
4026 word += (unsigned long) symbolAddress
4027 - (((long)image) + sect->offset - sect->addr);
4031 word += (unsigned long) symbolAddress;
4035 if(reloc->r_type == GENERIC_RELOC_VANILLA)
4040 #ifdef powerpc_HOST_ARCH
4041 else if(reloc->r_type == PPC_RELOC_LO16)
4043 ((unsigned short*) wordPtr)[1] = word & 0xFFFF;
4046 else if(reloc->r_type == PPC_RELOC_HI16)
4048 ((unsigned short*) wordPtr)[1] = (word >> 16) & 0xFFFF;
4051 else if(reloc->r_type == PPC_RELOC_HA16)
4053 ((unsigned short*) wordPtr)[1] = ((word >> 16) & 0xFFFF)
4054 + ((word & (1<<15)) ? 1 : 0);
4057 else if(reloc->r_type == PPC_RELOC_BR24)
4059 if((long)word > (long)0x01FFFFFF || (long)word < (long)0xFFE00000)
4061 // The branch offset is too large.
4062 // Therefore, we try to use a jump island.
4065 barf("unconditional relative branch out of range: "
4066 "no jump island available");
4069 word = offsetToJumpIsland;
4070 if((long)word > (long)0x01FFFFFF || (long)word < (long)0xFFE00000)
4071 barf("unconditional relative branch out of range: "
4072 "jump island out of range");
4074 *wordPtr = (*wordPtr & 0xFC000003) | (word & 0x03FFFFFC);
4079 barf("\nunknown relocation %d",reloc->r_type);
4086 static int ocGetNames_MachO(ObjectCode* oc)
4088 char *image = (char*) oc->image;
4089 struct mach_header *header = (struct mach_header*) image;
4090 struct load_command *lc = (struct load_command*) (image + sizeof(struct mach_header));
4091 unsigned i,curSymbol = 0;
4092 struct segment_command *segLC = NULL;
4093 struct section *sections;
4094 struct symtab_command *symLC = NULL;
4095 struct nlist *nlist;
4096 unsigned long commonSize = 0;
4097 char *commonStorage = NULL;
4098 unsigned long commonCounter;
4100 for(i=0;i<header->ncmds;i++)
4102 if(lc->cmd == LC_SEGMENT)
4103 segLC = (struct segment_command*) lc;
4104 else if(lc->cmd == LC_SYMTAB)
4105 symLC = (struct symtab_command*) lc;
4106 lc = (struct load_command *) ( ((char*)lc) + lc->cmdsize );
4109 sections = (struct section*) (segLC+1);
4110 nlist = symLC ? (struct nlist*) (image + symLC->symoff)
4113 for(i=0;i<segLC->nsects;i++)
4115 if(sections[i].size == 0)
4118 if((sections[i].flags & SECTION_TYPE) == S_ZEROFILL)
4120 char * zeroFillArea = stgCallocBytes(1,sections[i].size,
4121 "ocGetNames_MachO(common symbols)");
4122 sections[i].offset = zeroFillArea - image;
4125 if(!strcmp(sections[i].sectname,"__text"))
4126 addSection(oc, SECTIONKIND_CODE_OR_RODATA,
4127 (void*) (image + sections[i].offset),
4128 (void*) (image + sections[i].offset + sections[i].size));
4129 else if(!strcmp(sections[i].sectname,"__const"))
4130 addSection(oc, SECTIONKIND_RWDATA,
4131 (void*) (image + sections[i].offset),
4132 (void*) (image + sections[i].offset + sections[i].size));
4133 else if(!strcmp(sections[i].sectname,"__data"))
4134 addSection(oc, SECTIONKIND_RWDATA,
4135 (void*) (image + sections[i].offset),
4136 (void*) (image + sections[i].offset + sections[i].size));
4137 else if(!strcmp(sections[i].sectname,"__bss")
4138 || !strcmp(sections[i].sectname,"__common"))
4139 addSection(oc, SECTIONKIND_RWDATA,
4140 (void*) (image + sections[i].offset),
4141 (void*) (image + sections[i].offset + sections[i].size));
4143 addProddableBlock(oc, (void*) (image + sections[i].offset),
4147 // count external symbols defined here
4151 for(i=0;i<symLC->nsyms;i++)
4153 if(nlist[i].n_type & N_STAB)
4155 else if(nlist[i].n_type & N_EXT)
4157 if((nlist[i].n_type & N_TYPE) == N_UNDF
4158 && (nlist[i].n_value != 0))
4160 commonSize += nlist[i].n_value;
4163 else if((nlist[i].n_type & N_TYPE) == N_SECT)
4168 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
4169 "ocGetNames_MachO(oc->symbols)");
4173 for(i=0;i<symLC->nsyms;i++)
4175 if(nlist[i].n_type & N_STAB)
4177 else if((nlist[i].n_type & N_TYPE) == N_SECT)
4179 if(nlist[i].n_type & N_EXT)
4181 char *nm = image + symLC->stroff + nlist[i].n_un.n_strx;
4182 ghciInsertStrHashTable(oc->fileName, symhash, nm,
4184 + sections[nlist[i].n_sect-1].offset
4185 - sections[nlist[i].n_sect-1].addr
4186 + nlist[i].n_value);
4187 oc->symbols[curSymbol++] = nm;
4191 char *nm = image + symLC->stroff + nlist[i].n_un.n_strx;
4192 ghciInsertStrHashTable(oc->fileName, oc->lochash, nm,
4194 + sections[nlist[i].n_sect-1].offset
4195 - sections[nlist[i].n_sect-1].addr
4196 + nlist[i].n_value);
4202 commonStorage = stgCallocBytes(1,commonSize,"ocGetNames_MachO(common symbols)");
4203 commonCounter = (unsigned long)commonStorage;
4206 for(i=0;i<symLC->nsyms;i++)
4208 if((nlist[i].n_type & N_TYPE) == N_UNDF
4209 && (nlist[i].n_type & N_EXT) && (nlist[i].n_value != 0))
4211 char *nm = image + symLC->stroff + nlist[i].n_un.n_strx;
4212 unsigned long sz = nlist[i].n_value;
4214 nlist[i].n_value = commonCounter;
4216 ghciInsertStrHashTable(oc->fileName, symhash, nm,
4217 (void*)commonCounter);
4218 oc->symbols[curSymbol++] = nm;
4220 commonCounter += sz;
4227 static int ocResolve_MachO(ObjectCode* oc)
4229 char *image = (char*) oc->image;
4230 struct mach_header *header = (struct mach_header*) image;
4231 struct load_command *lc = (struct load_command*) (image + sizeof(struct mach_header));
4233 struct segment_command *segLC = NULL;
4234 struct section *sections;
4235 struct symtab_command *symLC = NULL;
4236 struct dysymtab_command *dsymLC = NULL;
4237 struct nlist *nlist;
4239 for(i=0;i<header->ncmds;i++)
4241 if(lc->cmd == LC_SEGMENT)
4242 segLC = (struct segment_command*) lc;
4243 else if(lc->cmd == LC_SYMTAB)
4244 symLC = (struct symtab_command*) lc;
4245 else if(lc->cmd == LC_DYSYMTAB)
4246 dsymLC = (struct dysymtab_command*) lc;
4247 lc = (struct load_command *) ( ((char*)lc) + lc->cmdsize );
4250 sections = (struct section*) (segLC+1);
4251 nlist = symLC ? (struct nlist*) (image + symLC->symoff)
4256 unsigned long *indirectSyms
4257 = (unsigned long*) (image + dsymLC->indirectsymoff);
4259 for(i=0;i<segLC->nsects;i++)
4261 if( !strcmp(sections[i].sectname,"__la_symbol_ptr")
4262 || !strcmp(sections[i].sectname,"__la_sym_ptr2")
4263 || !strcmp(sections[i].sectname,"__la_sym_ptr3"))
4265 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4268 else if(!strcmp(sections[i].sectname,"__nl_symbol_ptr")
4269 || !strcmp(sections[i].sectname,"__pointers"))
4271 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4274 else if(!strcmp(sections[i].sectname,"__jump_table"))
4276 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4282 for(i=0;i<segLC->nsects;i++)
4284 if(!relocateSection(oc,image,symLC,nlist,segLC->nsects,sections,§ions[i]))
4288 /* Free the local symbol table; we won't need it again. */
4289 freeHashTable(oc->lochash, NULL);
4292 #if defined (powerpc_HOST_ARCH)
4293 ocFlushInstructionCache( oc );
4299 #ifdef powerpc_HOST_ARCH
4301 * The Mach-O object format uses leading underscores. But not everywhere.
4302 * There is a small number of runtime support functions defined in
4303 * libcc_dynamic.a whose name does not have a leading underscore.
4304 * As a consequence, we can't get their address from C code.
4305 * We have to use inline assembler just to take the address of a function.
4309 static void machoInitSymbolsWithoutUnderscore()
4311 extern void* symbolsWithoutUnderscore[];
4312 void **p = symbolsWithoutUnderscore;
4313 __asm__ volatile(".globl _symbolsWithoutUnderscore\n.data\n_symbolsWithoutUnderscore:");
4317 __asm__ volatile(".long " # x);
4319 RTS_MACHO_NOUNDERLINE_SYMBOLS
4321 __asm__ volatile(".text");
4325 ghciInsertStrHashTable("(GHCi built-in symbols)", symhash, #x, *p++);
4327 RTS_MACHO_NOUNDERLINE_SYMBOLS
4334 * Figure out by how much to shift the entire Mach-O file in memory
4335 * when loading so that its single segment ends up 16-byte-aligned
4337 static int machoGetMisalignment( FILE * f )
4339 struct mach_header header;
4342 fread(&header, sizeof(header), 1, f);
4345 if(header.magic != MH_MAGIC)
4348 misalignment = (header.sizeofcmds + sizeof(header))
4351 return misalignment ? (16 - misalignment) : 0;