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 #if defined(GHCI) && defined(BREAKPOINT)
99 /* Hash table mapping info table ptrs to DataCon names */
100 static HashTable *dchash;
103 /* List of currently loaded objects */
104 ObjectCode *objects = NULL; /* initially empty */
106 #if defined(OBJFORMAT_ELF)
107 static int ocVerifyImage_ELF ( ObjectCode* oc );
108 static int ocGetNames_ELF ( ObjectCode* oc );
109 static int ocResolve_ELF ( ObjectCode* oc );
110 #if defined(powerpc_HOST_ARCH)
111 static int ocAllocateJumpIslands_ELF ( ObjectCode* oc );
113 #elif defined(OBJFORMAT_PEi386)
114 static int ocVerifyImage_PEi386 ( ObjectCode* oc );
115 static int ocGetNames_PEi386 ( ObjectCode* oc );
116 static int ocResolve_PEi386 ( ObjectCode* oc );
117 #elif defined(OBJFORMAT_MACHO)
118 static int ocVerifyImage_MachO ( ObjectCode* oc );
119 static int ocGetNames_MachO ( ObjectCode* oc );
120 static int ocResolve_MachO ( ObjectCode* oc );
122 static int machoGetMisalignment( FILE * );
123 #ifdef powerpc_HOST_ARCH
124 static int ocAllocateJumpIslands_MachO ( ObjectCode* oc );
125 static void machoInitSymbolsWithoutUnderscore( void );
129 #if defined(x86_64_HOST_ARCH)
130 static void*x86_64_high_symbol( char *lbl, void *addr );
133 /* -----------------------------------------------------------------------------
134 * Built-in symbols from the RTS
137 typedef struct _RtsSymbolVal {
144 #define Maybe_Stable_Names SymX(mkWeakzh_fast) \
145 SymX(makeStableNamezh_fast) \
146 SymX(finalizzeWeakzh_fast)
148 /* These are not available in GUM!!! -- HWL */
149 #define Maybe_Stable_Names
152 #if !defined (mingw32_HOST_OS)
153 #define RTS_POSIX_ONLY_SYMBOLS \
154 SymX(signal_handlers) \
155 SymX(stg_sig_install) \
159 #if defined (cygwin32_HOST_OS)
160 #define RTS_MINGW_ONLY_SYMBOLS /**/
161 /* Don't have the ability to read import libs / archives, so
162 * we have to stupidly list a lot of what libcygwin.a
165 #define RTS_CYGWIN_ONLY_SYMBOLS \
243 #elif !defined(mingw32_HOST_OS)
244 #define RTS_MINGW_ONLY_SYMBOLS /**/
245 #define RTS_CYGWIN_ONLY_SYMBOLS /**/
246 #else /* defined(mingw32_HOST_OS) */
247 #define RTS_POSIX_ONLY_SYMBOLS /**/
248 #define RTS_CYGWIN_ONLY_SYMBOLS /**/
250 /* Extra syms gen'ed by mingw-2's gcc-3.2: */
252 #define RTS_MINGW_EXTRA_SYMS \
253 Sym(_imp____mb_cur_max) \
256 #define RTS_MINGW_EXTRA_SYMS
259 /* These are statically linked from the mingw libraries into the ghc
260 executable, so we have to employ this hack. */
261 #define RTS_MINGW_ONLY_SYMBOLS \
262 SymX(asyncReadzh_fast) \
263 SymX(asyncWritezh_fast) \
264 SymX(asyncDoProczh_fast) \
276 SymX(getservbyname) \
277 SymX(getservbyport) \
278 SymX(getprotobynumber) \
279 SymX(getprotobyname) \
280 SymX(gethostbyname) \
281 SymX(gethostbyaddr) \
328 SymX(rts_InstallConsoleEvent) \
329 SymX(rts_ConsoleHandlerDone) \
331 Sym(_imp___timezone) \
341 RTS_MINGW_EXTRA_SYMS \
345 #if defined(darwin_TARGET_OS) && HAVE_PRINTF_LDBLSTUB
346 #define RTS_DARWIN_ONLY_SYMBOLS \
347 Sym(asprintf$LDBLStub) \
351 Sym(fprintf$LDBLStub) \
352 Sym(fscanf$LDBLStub) \
353 Sym(fwprintf$LDBLStub) \
354 Sym(fwscanf$LDBLStub) \
355 Sym(printf$LDBLStub) \
356 Sym(scanf$LDBLStub) \
357 Sym(snprintf$LDBLStub) \
358 Sym(sprintf$LDBLStub) \
359 Sym(sscanf$LDBLStub) \
360 Sym(strtold$LDBLStub) \
361 Sym(swprintf$LDBLStub) \
362 Sym(swscanf$LDBLStub) \
363 Sym(syslog$LDBLStub) \
364 Sym(vasprintf$LDBLStub) \
366 Sym(verrc$LDBLStub) \
367 Sym(verrx$LDBLStub) \
368 Sym(vfprintf$LDBLStub) \
369 Sym(vfscanf$LDBLStub) \
370 Sym(vfwprintf$LDBLStub) \
371 Sym(vfwscanf$LDBLStub) \
372 Sym(vprintf$LDBLStub) \
373 Sym(vscanf$LDBLStub) \
374 Sym(vsnprintf$LDBLStub) \
375 Sym(vsprintf$LDBLStub) \
376 Sym(vsscanf$LDBLStub) \
377 Sym(vswprintf$LDBLStub) \
378 Sym(vswscanf$LDBLStub) \
379 Sym(vsyslog$LDBLStub) \
380 Sym(vwarn$LDBLStub) \
381 Sym(vwarnc$LDBLStub) \
382 Sym(vwarnx$LDBLStub) \
383 Sym(vwprintf$LDBLStub) \
384 Sym(vwscanf$LDBLStub) \
386 Sym(warnc$LDBLStub) \
387 Sym(warnx$LDBLStub) \
388 Sym(wcstold$LDBLStub) \
389 Sym(wprintf$LDBLStub) \
392 #define RTS_DARWIN_ONLY_SYMBOLS
396 # define MAIN_CAP_SYM SymX(MainCapability)
398 # define MAIN_CAP_SYM
401 #if !defined(mingw32_HOST_OS)
402 #define RTS_USER_SIGNALS_SYMBOLS \
403 SymX(setIOManagerPipe)
405 #define RTS_USER_SIGNALS_SYMBOLS \
406 SymX(sendIOManagerEvent) \
407 SymX(readIOManagerEvent) \
408 SymX(getIOManagerEvent) \
409 SymX(console_handler)
412 #ifdef TABLES_NEXT_TO_CODE
413 #define RTS_RET_SYMBOLS /* nothing */
415 #define RTS_RET_SYMBOLS \
416 SymX(stg_enter_ret) \
417 SymX(stg_gc_fun_ret) \
424 SymX(stg_ap_pv_ret) \
425 SymX(stg_ap_pp_ret) \
426 SymX(stg_ap_ppv_ret) \
427 SymX(stg_ap_ppp_ret) \
428 SymX(stg_ap_pppv_ret) \
429 SymX(stg_ap_pppp_ret) \
430 SymX(stg_ap_ppppp_ret) \
431 SymX(stg_ap_pppppp_ret)
434 #define RTS_SYMBOLS \
437 SymX(stg_enter_info) \
438 SymX(stg_gc_void_info) \
439 SymX(__stg_gc_enter_1) \
440 SymX(stg_gc_noregs) \
441 SymX(stg_gc_unpt_r1_info) \
442 SymX(stg_gc_unpt_r1) \
443 SymX(stg_gc_unbx_r1_info) \
444 SymX(stg_gc_unbx_r1) \
445 SymX(stg_gc_f1_info) \
447 SymX(stg_gc_d1_info) \
449 SymX(stg_gc_l1_info) \
452 SymX(stg_gc_fun_info) \
454 SymX(stg_gc_gen_info) \
455 SymX(stg_gc_gen_hp) \
457 SymX(stg_gen_yield) \
458 SymX(stg_yield_noregs) \
459 SymX(stg_yield_to_interpreter) \
460 SymX(stg_gen_block) \
461 SymX(stg_block_noregs) \
463 SymX(stg_block_takemvar) \
464 SymX(stg_block_putmvar) \
465 SymX(stg_seq_frame_info) \
467 SymX(MallocFailHook) \
469 SymX(OutOfHeapHook) \
470 SymX(StackOverflowHook) \
471 SymX(__encodeDouble) \
472 SymX(__encodeFloat) \
476 SymX(__gmpz_cmp_si) \
477 SymX(__gmpz_cmp_ui) \
478 SymX(__gmpz_get_si) \
479 SymX(__gmpz_get_ui) \
480 SymX(__int_encodeDouble) \
481 SymX(__int_encodeFloat) \
482 SymX(andIntegerzh_fast) \
483 SymX(atomicallyzh_fast) \
487 SymX(blockAsyncExceptionszh_fast) \
489 SymX(catchRetryzh_fast) \
490 SymX(catchSTMzh_fast) \
492 SymX(closure_flags) \
494 SymX(cmpIntegerzh_fast) \
495 SymX(cmpIntegerIntzh_fast) \
496 SymX(complementIntegerzh_fast) \
497 SymX(createAdjustor) \
498 SymX(decodeDoublezh_fast) \
499 SymX(decodeFloatzh_fast) \
502 SymX(deRefWeakzh_fast) \
503 SymX(deRefStablePtrzh_fast) \
504 SymX(dirty_MUT_VAR) \
505 SymX(divExactIntegerzh_fast) \
506 SymX(divModIntegerzh_fast) \
508 SymX(forkOnzh_fast) \
510 SymX(forkOS_createThread) \
511 SymX(freeHaskellFunctionPtr) \
512 SymX(freeStablePtr) \
513 SymX(getOrSetTypeableStore) \
514 SymX(gcdIntegerzh_fast) \
515 SymX(gcdIntegerIntzh_fast) \
516 SymX(gcdIntzh_fast) \
525 SymX(hs_perform_gc) \
526 SymX(hs_free_stable_ptr) \
527 SymX(hs_free_fun_ptr) \
529 SymX(infoPtrzh_fast) \
530 SymX(closurePayloadzh_fast) \
531 SymX(int2Integerzh_fast) \
532 SymX(integer2Intzh_fast) \
533 SymX(integer2Wordzh_fast) \
534 SymX(isCurrentThreadBoundzh_fast) \
535 SymX(isDoubleDenormalized) \
536 SymX(isDoubleInfinite) \
538 SymX(isDoubleNegativeZero) \
539 SymX(isEmptyMVarzh_fast) \
540 SymX(isFloatDenormalized) \
541 SymX(isFloatInfinite) \
543 SymX(isFloatNegativeZero) \
544 SymX(killThreadzh_fast) \
546 SymX(insertStableSymbol) \
549 SymX(lookupDataCon) \
550 SymX(makeStablePtrzh_fast) \
551 SymX(minusIntegerzh_fast) \
552 SymX(mkApUpd0zh_fast) \
553 SymX(myThreadIdzh_fast) \
554 SymX(labelThreadzh_fast) \
555 SymX(newArrayzh_fast) \
556 SymX(newBCOzh_fast) \
557 SymX(newByteArrayzh_fast) \
558 SymX_redirect(newCAF, newDynCAF) \
559 SymX(newMVarzh_fast) \
560 SymX(newMutVarzh_fast) \
561 SymX(newTVarzh_fast) \
562 SymX(atomicModifyMutVarzh_fast) \
563 SymX(newPinnedByteArrayzh_fast) \
565 SymX(orIntegerzh_fast) \
567 SymX(performMajorGC) \
568 SymX(plusIntegerzh_fast) \
571 SymX(putMVarzh_fast) \
572 SymX(quotIntegerzh_fast) \
573 SymX(quotRemIntegerzh_fast) \
575 SymX(raiseIOzh_fast) \
576 SymX(readTVarzh_fast) \
577 SymX(remIntegerzh_fast) \
578 SymX(resetNonBlockingFd) \
583 SymX(rts_checkSchedStatus) \
586 SymX(rts_evalLazyIO) \
587 SymX(rts_evalStableIO) \
591 SymX(rts_getDouble) \
596 SymX(rts_getFunPtr) \
597 SymX(rts_getStablePtr) \
598 SymX(rts_getThreadId) \
600 SymX(rts_getWord32) \
613 SymX(rts_mkStablePtr) \
621 SymX(rtsSupportsBoundThreads) \
622 SymX(__hscore_get_saved_termios) \
623 SymX(__hscore_set_saved_termios) \
625 SymX(startupHaskell) \
626 SymX(shutdownHaskell) \
627 SymX(shutdownHaskellAndExit) \
628 SymX(stable_ptr_table) \
629 SymX(stackOverflow) \
630 SymX(stg_CAF_BLACKHOLE_info) \
631 SymX(awakenBlockedQueue) \
632 SymX(stg_CHARLIKE_closure) \
633 SymX(stg_EMPTY_MVAR_info) \
634 SymX(stg_IND_STATIC_info) \
635 SymX(stg_INTLIKE_closure) \
636 SymX(stg_MUT_ARR_PTRS_DIRTY_info) \
637 SymX(stg_MUT_ARR_PTRS_FROZEN_info) \
638 SymX(stg_MUT_ARR_PTRS_FROZEN0_info) \
639 SymX(stg_WEAK_info) \
640 SymX(stg_ap_v_info) \
641 SymX(stg_ap_f_info) \
642 SymX(stg_ap_d_info) \
643 SymX(stg_ap_l_info) \
644 SymX(stg_ap_n_info) \
645 SymX(stg_ap_p_info) \
646 SymX(stg_ap_pv_info) \
647 SymX(stg_ap_pp_info) \
648 SymX(stg_ap_ppv_info) \
649 SymX(stg_ap_ppp_info) \
650 SymX(stg_ap_pppv_info) \
651 SymX(stg_ap_pppp_info) \
652 SymX(stg_ap_ppppp_info) \
653 SymX(stg_ap_pppppp_info) \
654 SymX(stg_ap_0_fast) \
655 SymX(stg_ap_v_fast) \
656 SymX(stg_ap_f_fast) \
657 SymX(stg_ap_d_fast) \
658 SymX(stg_ap_l_fast) \
659 SymX(stg_ap_n_fast) \
660 SymX(stg_ap_p_fast) \
661 SymX(stg_ap_pv_fast) \
662 SymX(stg_ap_pp_fast) \
663 SymX(stg_ap_ppv_fast) \
664 SymX(stg_ap_ppp_fast) \
665 SymX(stg_ap_pppv_fast) \
666 SymX(stg_ap_pppp_fast) \
667 SymX(stg_ap_ppppp_fast) \
668 SymX(stg_ap_pppppp_fast) \
669 SymX(stg_ap_1_upd_info) \
670 SymX(stg_ap_2_upd_info) \
671 SymX(stg_ap_3_upd_info) \
672 SymX(stg_ap_4_upd_info) \
673 SymX(stg_ap_5_upd_info) \
674 SymX(stg_ap_6_upd_info) \
675 SymX(stg_ap_7_upd_info) \
677 SymX(stg_sel_0_upd_info) \
678 SymX(stg_sel_10_upd_info) \
679 SymX(stg_sel_11_upd_info) \
680 SymX(stg_sel_12_upd_info) \
681 SymX(stg_sel_13_upd_info) \
682 SymX(stg_sel_14_upd_info) \
683 SymX(stg_sel_15_upd_info) \
684 SymX(stg_sel_1_upd_info) \
685 SymX(stg_sel_2_upd_info) \
686 SymX(stg_sel_3_upd_info) \
687 SymX(stg_sel_4_upd_info) \
688 SymX(stg_sel_5_upd_info) \
689 SymX(stg_sel_6_upd_info) \
690 SymX(stg_sel_7_upd_info) \
691 SymX(stg_sel_8_upd_info) \
692 SymX(stg_sel_9_upd_info) \
693 SymX(stg_upd_frame_info) \
694 SymX(suspendThread) \
695 SymX(takeMVarzh_fast) \
696 SymX(timesIntegerzh_fast) \
697 SymX(tryPutMVarzh_fast) \
698 SymX(tryTakeMVarzh_fast) \
699 SymX(unblockAsyncExceptionszh_fast) \
701 SymX(unsafeThawArrayzh_fast) \
702 SymX(waitReadzh_fast) \
703 SymX(waitWritezh_fast) \
704 SymX(word2Integerzh_fast) \
705 SymX(writeTVarzh_fast) \
706 SymX(xorIntegerzh_fast) \
708 SymX(stg_interp_constr_entry) \
709 SymX(stg_interp_constr1_entry) \
710 SymX(stg_interp_constr2_entry) \
711 SymX(stg_interp_constr3_entry) \
712 SymX(stg_interp_constr4_entry) \
713 SymX(stg_interp_constr5_entry) \
714 SymX(stg_interp_constr6_entry) \
715 SymX(stg_interp_constr7_entry) \
716 SymX(stg_interp_constr8_entry) \
719 SymX(getAllocations) \
722 RTS_USER_SIGNALS_SYMBOLS
724 #ifdef SUPPORT_LONG_LONGS
725 #define RTS_LONG_LONG_SYMS \
726 SymX(int64ToIntegerzh_fast) \
727 SymX(word64ToIntegerzh_fast)
729 #define RTS_LONG_LONG_SYMS /* nothing */
732 // 64-bit support functions in libgcc.a
733 #if defined(__GNUC__) && SIZEOF_VOID_P <= 4
734 #define RTS_LIBGCC_SYMBOLS \
744 #elif defined(ia64_HOST_ARCH)
745 #define RTS_LIBGCC_SYMBOLS \
753 #define RTS_LIBGCC_SYMBOLS
756 #if defined(darwin_HOST_OS) && defined(powerpc_HOST_ARCH)
757 // Symbols that don't have a leading underscore
758 // on Mac OS X. They have to receive special treatment,
759 // see machoInitSymbolsWithoutUnderscore()
760 #define RTS_MACHO_NOUNDERLINE_SYMBOLS \
765 /* entirely bogus claims about types of these symbols */
766 #define Sym(vvv) extern void vvv(void);
767 #define SymX(vvv) /**/
768 #define SymX_redirect(vvv,xxx) /**/
772 RTS_POSIX_ONLY_SYMBOLS
773 RTS_MINGW_ONLY_SYMBOLS
774 RTS_CYGWIN_ONLY_SYMBOLS
775 RTS_DARWIN_ONLY_SYMBOLS
781 #ifdef LEADING_UNDERSCORE
782 #define MAYBE_LEADING_UNDERSCORE_STR(s) ("_" s)
784 #define MAYBE_LEADING_UNDERSCORE_STR(s) (s)
787 #define Sym(vvv) { MAYBE_LEADING_UNDERSCORE_STR(#vvv), \
789 #define SymX(vvv) Sym(vvv)
791 // SymX_redirect allows us to redirect references to one symbol to
792 // another symbol. See newCAF/newDynCAF for an example.
793 #define SymX_redirect(vvv,xxx) \
794 { MAYBE_LEADING_UNDERSCORE_STR(#vvv), \
797 static RtsSymbolVal rtsSyms[] = {
801 RTS_POSIX_ONLY_SYMBOLS
802 RTS_MINGW_ONLY_SYMBOLS
803 RTS_CYGWIN_ONLY_SYMBOLS
804 RTS_DARWIN_ONLY_SYMBOLS
806 #if defined(darwin_HOST_OS) && defined(i386_HOST_ARCH)
807 // dyld stub code contains references to this,
808 // but it should never be called because we treat
809 // lazy pointers as nonlazy.
810 { "dyld_stub_binding_helper", (void*)0xDEADBEEF },
812 { 0, 0 } /* sentinel */
817 /* -----------------------------------------------------------------------------
818 * Insert symbols into hash tables, checking for duplicates.
821 static void ghciInsertStrHashTable ( char* obj_name,
827 if (lookupHashTable(table, (StgWord)key) == NULL)
829 insertStrHashTable(table, (StgWord)key, data);
830 #if defined(GHCI) && defined(BREAKPOINT)
831 // Insert the reverse pair in the datacon hash if it is a closure
833 if(isSuffixOf(key, "static_info") || isSuffixOf(key, "con_info")) {
834 insertHashTable(dchash, (StgWord)data, key);
835 // debugBelch("DChash addSymbol: %s (%p)\n", key, data);
843 "GHCi runtime linker: fatal error: I found a duplicate definition for symbol\n"
845 "whilst processing object file\n"
847 "This could be caused by:\n"
848 " * Loading two different object files which export the same symbol\n"
849 " * Specifying the same object file twice on the GHCi command line\n"
850 " * An incorrect `package.conf' entry, causing some object to be\n"
852 "GHCi cannot safely continue in this situation. Exiting now. Sorry.\n"
860 #if defined(GHCI) && defined(BREAKPOINT)
861 static void ghciInsertDCTable ( char* obj_name,
866 ghciInsertStrHashTable(obj_name, dchash, (char *)key, data);
870 /* -----------------------------------------------------------------------------
871 * initialize the object linker
875 static int linker_init_done = 0 ;
877 #if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
878 static void *dl_prog_handle;
886 /* Make initLinker idempotent, so we can call it
887 before evey relevant operation; that means we
888 don't need to initialise the linker separately */
889 if (linker_init_done == 1) { return; } else {
890 linker_init_done = 1;
893 stablehash = allocStrHashTable();
894 symhash = allocStrHashTable();
895 #if defined(GHCI) && defined(BREAKPOINT)
896 dchash = allocHashTable();
899 /* populate the symbol table with stuff from the RTS */
900 for (sym = rtsSyms; sym->lbl != NULL; sym++) {
901 ghciInsertStrHashTable("(GHCi built-in symbols)",
902 symhash, sym->lbl, sym->addr);
904 # if defined(OBJFORMAT_MACHO) && defined(powerpc_HOST_ARCH)
905 machoInitSymbolsWithoutUnderscore();
908 # if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
909 # if defined(RTLD_DEFAULT)
910 dl_prog_handle = RTLD_DEFAULT;
912 dl_prog_handle = dlopen(NULL, RTLD_LAZY);
913 # endif /* RTLD_DEFAULT */
917 /* -----------------------------------------------------------------------------
918 * Loading DLL or .so dynamic libraries
919 * -----------------------------------------------------------------------------
921 * Add a DLL from which symbols may be found. In the ELF case, just
922 * do RTLD_GLOBAL-style add, so no further messing around needs to
923 * happen in order that symbols in the loaded .so are findable --
924 * lookupSymbol() will subsequently see them by dlsym on the program's
925 * dl-handle. Returns NULL if success, otherwise ptr to an err msg.
927 * In the PEi386 case, open the DLLs and put handles to them in a
928 * linked list. When looking for a symbol, try all handles in the
929 * list. This means that we need to load even DLLs that are guaranteed
930 * to be in the ghc.exe image already, just so we can get a handle
931 * to give to loadSymbol, so that we can find the symbols. For such
932 * libraries, the LoadLibrary call should be a no-op except for returning
937 #if defined(OBJFORMAT_PEi386)
938 /* A record for storing handles into DLLs. */
943 struct _OpenedDLL* next;
948 /* A list thereof. */
949 static OpenedDLL* opened_dlls = NULL;
953 addDLL( char *dll_name )
955 # if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
956 /* ------------------- ELF DLL loader ------------------- */
962 hdl= dlopen(dll_name, RTLD_NOW | RTLD_GLOBAL);
965 /* dlopen failed; return a ptr to the error msg. */
967 if (errmsg == NULL) errmsg = "addDLL: unknown error";
974 # elif defined(OBJFORMAT_PEi386)
975 /* ------------------- Win32 DLL loader ------------------- */
983 /* debugBelch("\naddDLL; dll_name = `%s'\n", dll_name); */
985 /* See if we've already got it, and ignore if so. */
986 for (o_dll = opened_dlls; o_dll != NULL; o_dll = o_dll->next) {
987 if (0 == strcmp(o_dll->name, dll_name))
991 /* The file name has no suffix (yet) so that we can try
992 both foo.dll and foo.drv
994 The documentation for LoadLibrary says:
995 If no file name extension is specified in the lpFileName
996 parameter, the default library extension .dll is
997 appended. However, the file name string can include a trailing
998 point character (.) to indicate that the module name has no
1001 buf = stgMallocBytes(strlen(dll_name) + 10, "addDLL");
1002 sprintf(buf, "%s.DLL", dll_name);
1003 instance = LoadLibrary(buf);
1004 if (instance == NULL) {
1005 sprintf(buf, "%s.DRV", dll_name); // KAA: allow loading of drivers (like winspool.drv)
1006 instance = LoadLibrary(buf);
1007 if (instance == NULL) {
1010 /* LoadLibrary failed; return a ptr to the error msg. */
1011 return "addDLL: unknown error";
1016 /* Add this DLL to the list of DLLs in which to search for symbols. */
1017 o_dll = stgMallocBytes( sizeof(OpenedDLL), "addDLL" );
1018 o_dll->name = stgMallocBytes(1+strlen(dll_name), "addDLL");
1019 strcpy(o_dll->name, dll_name);
1020 o_dll->instance = instance;
1021 o_dll->next = opened_dlls;
1022 opened_dlls = o_dll;
1026 barf("addDLL: not implemented on this platform");
1030 /* -----------------------------------------------------------------------------
1031 * insert a stable symbol in the hash table
1035 insertStableSymbol(char* obj_name, char* key, StgPtr p)
1037 ghciInsertStrHashTable(obj_name, stablehash, key, getStablePtr(p));
1041 /* -----------------------------------------------------------------------------
1042 * insert a symbol in the hash table
1045 insertSymbol(char* obj_name, char* key, void* data)
1047 ghciInsertStrHashTable(obj_name, symhash, key, data);
1050 /* -----------------------------------------------------------------------------
1051 * lookup a symbol in the hash table
1054 lookupSymbol( char *lbl )
1058 ASSERT(symhash != NULL);
1059 val = lookupStrHashTable(symhash, lbl);
1062 # if defined(OBJFORMAT_ELF)
1063 # if defined(x86_64_HOST_ARCH)
1064 val = dlsym(dl_prog_handle, lbl);
1065 if (val >= (void *)0x80000000) {
1067 new_val = x86_64_high_symbol(lbl, val);
1068 IF_DEBUG(linker,debugBelch("lookupSymbol: relocating out of range symbol: %s = %p, now %p\n", lbl, val, new_val));
1074 return dlsym(dl_prog_handle, lbl);
1076 # elif defined(OBJFORMAT_MACHO)
1077 if(NSIsSymbolNameDefined(lbl)) {
1078 NSSymbol symbol = NSLookupAndBindSymbol(lbl);
1079 return NSAddressOfSymbol(symbol);
1083 # elif defined(OBJFORMAT_PEi386)
1086 for (o_dll = opened_dlls; o_dll != NULL; o_dll = o_dll->next) {
1087 /* debugBelch("look in %s for %s\n", o_dll->name, lbl); */
1088 if (lbl[0] == '_') {
1089 /* HACK: if the name has an initial underscore, try stripping
1090 it off & look that up first. I've yet to verify whether there's
1091 a Rule that governs whether an initial '_' *should always* be
1092 stripped off when mapping from import lib name to the DLL name.
1094 sym = GetProcAddress(o_dll->instance, (lbl+1));
1096 /*debugBelch("found %s in %s\n", lbl+1,o_dll->name);*/
1100 sym = GetProcAddress(o_dll->instance, lbl);
1102 /*debugBelch("found %s in %s\n", lbl,o_dll->name);*/
1116 #if defined(GHCI) && defined(BREAKPOINT)
1118 lookupDataCon( StgWord addr )
1122 ASSERT(dchash != NULL);
1123 val = lookupHashTable(dchash, addr);
1128 char* lookupDataCon( StgWord addr )
1135 __attribute((unused))
1137 lookupLocalSymbol( ObjectCode* oc, char *lbl )
1141 val = lookupStrHashTable(oc->lochash, lbl);
1151 /* -----------------------------------------------------------------------------
1152 * Debugging aid: look in GHCi's object symbol tables for symbols
1153 * within DELTA bytes of the specified address, and show their names.
1156 void ghci_enquire ( char* addr );
1158 void ghci_enquire ( char* addr )
1163 const int DELTA = 64;
1168 for (oc = objects; oc; oc = oc->next) {
1169 for (i = 0; i < oc->n_symbols; i++) {
1170 sym = oc->symbols[i];
1171 if (sym == NULL) continue;
1172 // debugBelch("enquire %p %p\n", sym, oc->lochash);
1174 if (oc->lochash != NULL) {
1175 a = lookupStrHashTable(oc->lochash, sym);
1178 a = lookupStrHashTable(symhash, sym);
1181 // debugBelch("ghci_enquire: can't find %s\n", sym);
1183 else if (addr-DELTA <= a && a <= addr+DELTA) {
1184 debugBelch("%p + %3d == `%s'\n", addr, (int)(a - addr), sym);
1191 #ifdef ia64_HOST_ARCH
1192 static unsigned int PLTSize(void);
1195 /* -----------------------------------------------------------------------------
1196 * Load an obj (populate the global symbol table, but don't resolve yet)
1198 * Returns: 1 if ok, 0 on error.
1201 loadObj( char *path )
1208 void *map_addr = NULL;
1214 /* debugBelch("loadObj %s\n", path ); */
1216 /* Check that we haven't already loaded this object.
1217 Ignore requests to load multiple times */
1221 for (o = objects; o; o = o->next) {
1222 if (0 == strcmp(o->fileName, path)) {
1224 break; /* don't need to search further */
1228 IF_DEBUG(linker, debugBelch(
1229 "GHCi runtime linker: warning: looks like you're trying to load the\n"
1230 "same object file twice:\n"
1232 "GHCi will ignore this, but be warned.\n"
1234 return 1; /* success */
1238 oc = stgMallocBytes(sizeof(ObjectCode), "loadObj(oc)");
1240 # if defined(OBJFORMAT_ELF)
1241 oc->formatName = "ELF";
1242 # elif defined(OBJFORMAT_PEi386)
1243 oc->formatName = "PEi386";
1244 # elif defined(OBJFORMAT_MACHO)
1245 oc->formatName = "Mach-O";
1248 barf("loadObj: not implemented on this platform");
1251 r = stat(path, &st);
1252 if (r == -1) { return 0; }
1254 /* sigh, strdup() isn't a POSIX function, so do it the long way */
1255 oc->fileName = stgMallocBytes( strlen(path)+1, "loadObj" );
1256 strcpy(oc->fileName, path);
1258 oc->fileSize = st.st_size;
1260 oc->sections = NULL;
1261 oc->lochash = allocStrHashTable();
1262 oc->proddables = NULL;
1264 /* chain it onto the list of objects */
1269 #define ROUND_UP(x,size) ((x + size - 1) & ~(size - 1))
1271 /* On many architectures malloc'd memory isn't executable, so we need to use mmap. */
1273 #if defined(openbsd_HOST_OS)
1274 fd = open(path, O_RDONLY, S_IRUSR);
1276 fd = open(path, O_RDONLY);
1279 barf("loadObj: can't open `%s'", path);
1281 pagesize = getpagesize();
1283 #ifdef ia64_HOST_ARCH
1284 /* The PLT needs to be right before the object */
1285 n = ROUND_UP(PLTSize(), pagesize);
1286 oc->plt = mmap(NULL, n, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
1287 if (oc->plt == MAP_FAILED)
1288 barf("loadObj: can't allocate PLT");
1291 map_addr = oc->plt + n;
1294 n = ROUND_UP(oc->fileSize, pagesize);
1296 /* Link objects into the lower 2Gb on x86_64. GHC assumes the
1297 * small memory model on this architecture (see gcc docs,
1300 #ifdef x86_64_HOST_ARCH
1301 #define EXTRA_MAP_FLAGS MAP_32BIT
1303 #define EXTRA_MAP_FLAGS 0
1306 oc->image = mmap(map_addr, n, PROT_EXEC|PROT_READ|PROT_WRITE,
1307 MAP_PRIVATE|EXTRA_MAP_FLAGS, fd, 0);
1308 if (oc->image == MAP_FAILED)
1309 barf("loadObj: can't map `%s'", path);
1313 #else /* !USE_MMAP */
1315 /* load the image into memory */
1316 f = fopen(path, "rb");
1318 barf("loadObj: can't read `%s'", path);
1320 # if defined(mingw32_HOST_OS)
1321 // TODO: We would like to use allocateExec here, but allocateExec
1322 // cannot currently allocate blocks large enough.
1323 oc->image = VirtualAlloc(NULL, oc->fileSize, MEM_RESERVE | MEM_COMMIT,
1324 PAGE_EXECUTE_READWRITE);
1325 # elif defined(darwin_HOST_OS)
1326 // In a Mach-O .o file, all sections can and will be misaligned
1327 // if the total size of the headers is not a multiple of the
1328 // desired alignment. This is fine for .o files that only serve
1329 // as input for the static linker, but it's not fine for us,
1330 // as SSE (used by gcc for floating point) and Altivec require
1331 // 16-byte alignment.
1332 // We calculate the correct alignment from the header before
1333 // reading the file, and then we misalign oc->image on purpose so
1334 // that the actual sections end up aligned again.
1335 oc->misalignment = machoGetMisalignment(f);
1336 oc->image = stgMallocBytes(oc->fileSize + oc->misalignment, "loadObj(image)");
1338 oc->image = stgMallocBytes(oc->fileSize, "loadObj(image)");
1341 n = fread ( oc->image, 1, oc->fileSize, f );
1342 if (n != oc->fileSize)
1343 barf("loadObj: error whilst reading `%s'", path);
1347 #endif /* USE_MMAP */
1349 # if defined(OBJFORMAT_MACHO) && defined(powerpc_HOST_ARCH)
1350 r = ocAllocateJumpIslands_MachO ( oc );
1351 if (!r) { return r; }
1352 # elif defined(OBJFORMAT_ELF) && defined(powerpc_HOST_ARCH)
1353 r = ocAllocateJumpIslands_ELF ( oc );
1354 if (!r) { return r; }
1357 /* verify the in-memory image */
1358 # if defined(OBJFORMAT_ELF)
1359 r = ocVerifyImage_ELF ( oc );
1360 # elif defined(OBJFORMAT_PEi386)
1361 r = ocVerifyImage_PEi386 ( oc );
1362 # elif defined(OBJFORMAT_MACHO)
1363 r = ocVerifyImage_MachO ( oc );
1365 barf("loadObj: no verify method");
1367 if (!r) { return r; }
1369 /* build the symbol list for this image */
1370 # if defined(OBJFORMAT_ELF)
1371 r = ocGetNames_ELF ( oc );
1372 # elif defined(OBJFORMAT_PEi386)
1373 r = ocGetNames_PEi386 ( oc );
1374 # elif defined(OBJFORMAT_MACHO)
1375 r = ocGetNames_MachO ( oc );
1377 barf("loadObj: no getNames method");
1379 if (!r) { return r; }
1381 /* loaded, but not resolved yet */
1382 oc->status = OBJECT_LOADED;
1387 /* -----------------------------------------------------------------------------
1388 * resolve all the currently unlinked objects in memory
1390 * Returns: 1 if ok, 0 on error.
1400 for (oc = objects; oc; oc = oc->next) {
1401 if (oc->status != OBJECT_RESOLVED) {
1402 # if defined(OBJFORMAT_ELF)
1403 r = ocResolve_ELF ( oc );
1404 # elif defined(OBJFORMAT_PEi386)
1405 r = ocResolve_PEi386 ( oc );
1406 # elif defined(OBJFORMAT_MACHO)
1407 r = ocResolve_MachO ( oc );
1409 barf("resolveObjs: not implemented on this platform");
1411 if (!r) { return r; }
1412 oc->status = OBJECT_RESOLVED;
1418 /* -----------------------------------------------------------------------------
1419 * delete an object from the pool
1422 unloadObj( char *path )
1424 ObjectCode *oc, *prev;
1426 ASSERT(symhash != NULL);
1427 ASSERT(objects != NULL);
1432 for (oc = objects; oc; prev = oc, oc = oc->next) {
1433 if (!strcmp(oc->fileName,path)) {
1435 /* Remove all the mappings for the symbols within this
1440 for (i = 0; i < oc->n_symbols; i++) {
1441 if (oc->symbols[i] != NULL) {
1442 removeStrHashTable(symhash, oc->symbols[i], NULL);
1450 prev->next = oc->next;
1453 // We're going to leave this in place, in case there are
1454 // any pointers from the heap into it:
1455 // #ifdef mingw32_HOST_OS
1456 // VirtualFree(oc->image);
1458 // stgFree(oc->image);
1460 stgFree(oc->fileName);
1461 stgFree(oc->symbols);
1462 stgFree(oc->sections);
1463 /* The local hash table should have been freed at the end
1464 of the ocResolve_ call on it. */
1465 ASSERT(oc->lochash == NULL);
1471 errorBelch("unloadObj: can't find `%s' to unload", path);
1475 /* -----------------------------------------------------------------------------
1476 * Sanity checking. For each ObjectCode, maintain a list of address ranges
1477 * which may be prodded during relocation, and abort if we try and write
1478 * outside any of these.
1480 static void addProddableBlock ( ObjectCode* oc, void* start, int size )
1483 = stgMallocBytes(sizeof(ProddableBlock), "addProddableBlock");
1484 /* debugBelch("aPB %p %p %d\n", oc, start, size); */
1488 pb->next = oc->proddables;
1489 oc->proddables = pb;
1492 static void checkProddableBlock ( ObjectCode* oc, void* addr )
1495 for (pb = oc->proddables; pb != NULL; pb = pb->next) {
1496 char* s = (char*)(pb->start);
1497 char* e = s + pb->size - 1;
1498 char* a = (char*)addr;
1499 /* Assumes that the biggest fixup involves a 4-byte write. This
1500 probably needs to be changed to 8 (ie, +7) on 64-bit
1502 if (a >= s && (a+3) <= e) return;
1504 barf("checkProddableBlock: invalid fixup in runtime linker");
1507 /* -----------------------------------------------------------------------------
1508 * Section management.
1510 static void addSection ( ObjectCode* oc, SectionKind kind,
1511 void* start, void* end )
1513 Section* s = stgMallocBytes(sizeof(Section), "addSection");
1517 s->next = oc->sections;
1520 debugBelch("addSection: %p-%p (size %d), kind %d\n",
1521 start, ((char*)end)-1, end - start + 1, kind );
1526 /* --------------------------------------------------------------------------
1527 * PowerPC specifics (jump islands)
1528 * ------------------------------------------------------------------------*/
1530 #if defined(powerpc_HOST_ARCH)
1533 ocAllocateJumpIslands
1535 Allocate additional space at the end of the object file image to make room
1538 PowerPC relative branch instructions have a 24 bit displacement field.
1539 As PPC code is always 4-byte-aligned, this yields a +-32MB range.
1540 If a particular imported symbol is outside this range, we have to redirect
1541 the jump to a short piece of new code that just loads the 32bit absolute
1542 address and jumps there.
1543 This function just allocates space for one 16 byte ppcJumpIsland for every
1544 undefined symbol in the object file. The code for the islands is filled in by
1545 makeJumpIsland below.
1548 static int ocAllocateJumpIslands( ObjectCode* oc, int count, int first )
1554 int misalignment = 0;
1556 misalignment = oc->misalignment;
1561 // round up to the nearest 4
1562 aligned = (oc->fileSize + 3) & ~3;
1565 #ifndef linux_HOST_OS /* mremap is a linux extension */
1566 #error ocAllocateJumpIslands doesnt want USE_MMAP to be defined
1569 pagesize = getpagesize();
1570 n = ROUND_UP( oc->fileSize, pagesize );
1571 m = ROUND_UP( aligned + sizeof (ppcJumpIsland) * count, pagesize );
1573 /* If we have a half-page-size file and map one page of it then
1574 * the part of the page after the size of the file remains accessible.
1575 * If, however, we map in 2 pages, the 2nd page is not accessible
1576 * and will give a "Bus Error" on access. To get around this, we check
1577 * if we need any extra pages for the jump islands and map them in
1578 * anonymously. We must check that we actually require extra pages
1579 * otherwise the attempt to mmap 0 pages of anonymous memory will
1585 /* The effect of this mremap() call is only the ensure that we have
1586 * a sufficient number of virtually contiguous pages. As returned from
1587 * mremap, the pages past the end of the file are not backed. We give
1588 * them a backing by using MAP_FIXED to map in anonymous pages.
1590 oc->image = mremap( oc->image, n, m, MREMAP_MAYMOVE );
1592 if( oc->image == MAP_FAILED )
1594 errorBelch( "Unable to mremap for Jump Islands\n" );
1598 if( mmap( oc->image + n, m - n, PROT_READ | PROT_WRITE | PROT_EXEC,
1599 MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED, 0, 0 ) == MAP_FAILED )
1601 errorBelch( "Unable to mmap( MAP_FIXED ) for Jump Islands\n" );
1607 oc->image -= misalignment;
1608 oc->image = stgReallocBytes( oc->image,
1610 aligned + sizeof (ppcJumpIsland) * count,
1611 "ocAllocateJumpIslands" );
1612 oc->image += misalignment;
1613 #endif /* USE_MMAP */
1615 oc->jump_islands = (ppcJumpIsland *) (oc->image + aligned);
1616 memset( oc->jump_islands, 0, sizeof (ppcJumpIsland) * count );
1619 oc->jump_islands = NULL;
1621 oc->island_start_symbol = first;
1622 oc->n_islands = count;
1627 static unsigned long makeJumpIsland( ObjectCode* oc,
1628 unsigned long symbolNumber,
1629 unsigned long target )
1631 ppcJumpIsland *island;
1633 if( symbolNumber < oc->island_start_symbol ||
1634 symbolNumber - oc->island_start_symbol > oc->n_islands)
1637 island = &oc->jump_islands[symbolNumber - oc->island_start_symbol];
1639 // lis r12, hi16(target)
1640 island->lis_r12 = 0x3d80;
1641 island->hi_addr = target >> 16;
1643 // ori r12, r12, lo16(target)
1644 island->ori_r12_r12 = 0x618c;
1645 island->lo_addr = target & 0xffff;
1648 island->mtctr_r12 = 0x7d8903a6;
1651 island->bctr = 0x4e800420;
1653 return (unsigned long) island;
1657 ocFlushInstructionCache
1659 Flush the data & instruction caches.
1660 Because the PPC has split data/instruction caches, we have to
1661 do that whenever we modify code at runtime.
1664 static void ocFlushInstructionCache( ObjectCode *oc )
1666 int n = (oc->fileSize + sizeof( ppcJumpIsland ) * oc->n_islands + 3) / 4;
1667 unsigned long *p = (unsigned long *) oc->image;
1671 __asm__ volatile ( "dcbf 0,%0\n\t"
1679 __asm__ volatile ( "sync\n\t"
1685 /* --------------------------------------------------------------------------
1686 * PEi386 specifics (Win32 targets)
1687 * ------------------------------------------------------------------------*/
1689 /* The information for this linker comes from
1690 Microsoft Portable Executable
1691 and Common Object File Format Specification
1692 revision 5.1 January 1998
1693 which SimonM says comes from the MS Developer Network CDs.
1695 It can be found there (on older CDs), but can also be found
1698 http://www.microsoft.com/hwdev/hardware/PECOFF.asp
1700 (this is Rev 6.0 from February 1999).
1702 Things move, so if that fails, try searching for it via
1704 http://www.google.com/search?q=PE+COFF+specification
1706 The ultimate reference for the PE format is the Winnt.h
1707 header file that comes with the Platform SDKs; as always,
1708 implementations will drift wrt their documentation.
1710 A good background article on the PE format is Matt Pietrek's
1711 March 1994 article in Microsoft System Journal (MSJ)
1712 (Vol.9, No. 3): "Peering Inside the PE: A Tour of the
1713 Win32 Portable Executable File Format." The info in there
1714 has recently been updated in a two part article in
1715 MSDN magazine, issues Feb and March 2002,
1716 "Inside Windows: An In-Depth Look into the Win32 Portable
1717 Executable File Format"
1719 John Levine's book "Linkers and Loaders" contains useful
1724 #if defined(OBJFORMAT_PEi386)
1728 typedef unsigned char UChar;
1729 typedef unsigned short UInt16;
1730 typedef unsigned int UInt32;
1737 UInt16 NumberOfSections;
1738 UInt32 TimeDateStamp;
1739 UInt32 PointerToSymbolTable;
1740 UInt32 NumberOfSymbols;
1741 UInt16 SizeOfOptionalHeader;
1742 UInt16 Characteristics;
1746 #define sizeof_COFF_header 20
1753 UInt32 VirtualAddress;
1754 UInt32 SizeOfRawData;
1755 UInt32 PointerToRawData;
1756 UInt32 PointerToRelocations;
1757 UInt32 PointerToLinenumbers;
1758 UInt16 NumberOfRelocations;
1759 UInt16 NumberOfLineNumbers;
1760 UInt32 Characteristics;
1764 #define sizeof_COFF_section 40
1771 UInt16 SectionNumber;
1774 UChar NumberOfAuxSymbols;
1778 #define sizeof_COFF_symbol 18
1783 UInt32 VirtualAddress;
1784 UInt32 SymbolTableIndex;
1789 #define sizeof_COFF_reloc 10
1792 /* From PE spec doc, section 3.3.2 */
1793 /* Note use of MYIMAGE_* since IMAGE_* are already defined in
1794 windows.h -- for the same purpose, but I want to know what I'm
1796 #define MYIMAGE_FILE_RELOCS_STRIPPED 0x0001
1797 #define MYIMAGE_FILE_EXECUTABLE_IMAGE 0x0002
1798 #define MYIMAGE_FILE_DLL 0x2000
1799 #define MYIMAGE_FILE_SYSTEM 0x1000
1800 #define MYIMAGE_FILE_BYTES_REVERSED_HI 0x8000
1801 #define MYIMAGE_FILE_BYTES_REVERSED_LO 0x0080
1802 #define MYIMAGE_FILE_32BIT_MACHINE 0x0100
1804 /* From PE spec doc, section 5.4.2 and 5.4.4 */
1805 #define MYIMAGE_SYM_CLASS_EXTERNAL 2
1806 #define MYIMAGE_SYM_CLASS_STATIC 3
1807 #define MYIMAGE_SYM_UNDEFINED 0
1809 /* From PE spec doc, section 4.1 */
1810 #define MYIMAGE_SCN_CNT_CODE 0x00000020
1811 #define MYIMAGE_SCN_CNT_INITIALIZED_DATA 0x00000040
1812 #define MYIMAGE_SCN_LNK_NRELOC_OVFL 0x01000000
1814 /* From PE spec doc, section 5.2.1 */
1815 #define MYIMAGE_REL_I386_DIR32 0x0006
1816 #define MYIMAGE_REL_I386_REL32 0x0014
1819 /* We use myindex to calculate array addresses, rather than
1820 simply doing the normal subscript thing. That's because
1821 some of the above structs have sizes which are not
1822 a whole number of words. GCC rounds their sizes up to a
1823 whole number of words, which means that the address calcs
1824 arising from using normal C indexing or pointer arithmetic
1825 are just plain wrong. Sigh.
1828 myindex ( int scale, void* base, int index )
1831 ((UChar*)base) + scale * index;
1836 printName ( UChar* name, UChar* strtab )
1838 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
1839 UInt32 strtab_offset = * (UInt32*)(name+4);
1840 debugBelch("%s", strtab + strtab_offset );
1843 for (i = 0; i < 8; i++) {
1844 if (name[i] == 0) break;
1845 debugBelch("%c", name[i] );
1852 copyName ( UChar* name, UChar* strtab, UChar* dst, int dstSize )
1854 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
1855 UInt32 strtab_offset = * (UInt32*)(name+4);
1856 strncpy ( dst, strtab+strtab_offset, dstSize );
1862 if (name[i] == 0) break;
1872 cstring_from_COFF_symbol_name ( UChar* name, UChar* strtab )
1875 /* If the string is longer than 8 bytes, look in the
1876 string table for it -- this will be correctly zero terminated.
1878 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
1879 UInt32 strtab_offset = * (UInt32*)(name+4);
1880 return ((UChar*)strtab) + strtab_offset;
1882 /* Otherwise, if shorter than 8 bytes, return the original,
1883 which by defn is correctly terminated.
1885 if (name[7]==0) return name;
1886 /* The annoying case: 8 bytes. Copy into a temporary
1887 (which is never freed ...)
1889 newstr = stgMallocBytes(9, "cstring_from_COFF_symbol_name");
1891 strncpy(newstr,name,8);
1897 /* Just compares the short names (first 8 chars) */
1898 static COFF_section *
1899 findPEi386SectionCalled ( ObjectCode* oc, char* name )
1903 = (COFF_header*)(oc->image);
1904 COFF_section* sectab
1906 ((UChar*)(oc->image))
1907 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
1909 for (i = 0; i < hdr->NumberOfSections; i++) {
1912 COFF_section* section_i
1914 myindex ( sizeof_COFF_section, sectab, i );
1915 n1 = (UChar*) &(section_i->Name);
1917 if (n1[0]==n2[0] && n1[1]==n2[1] && n1[2]==n2[2] &&
1918 n1[3]==n2[3] && n1[4]==n2[4] && n1[5]==n2[5] &&
1919 n1[6]==n2[6] && n1[7]==n2[7])
1928 zapTrailingAtSign ( UChar* sym )
1930 # define my_isdigit(c) ((c) >= '0' && (c) <= '9')
1932 if (sym[0] == 0) return;
1934 while (sym[i] != 0) i++;
1937 while (j > 0 && my_isdigit(sym[j])) j--;
1938 if (j > 0 && sym[j] == '@' && j != i) sym[j] = 0;
1944 ocVerifyImage_PEi386 ( ObjectCode* oc )
1949 COFF_section* sectab;
1950 COFF_symbol* symtab;
1952 /* debugBelch("\nLOADING %s\n", oc->fileName); */
1953 hdr = (COFF_header*)(oc->image);
1954 sectab = (COFF_section*) (
1955 ((UChar*)(oc->image))
1956 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
1958 symtab = (COFF_symbol*) (
1959 ((UChar*)(oc->image))
1960 + hdr->PointerToSymbolTable
1962 strtab = ((UChar*)symtab)
1963 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
1965 if (hdr->Machine != 0x14c) {
1966 errorBelch("%s: Not x86 PEi386", oc->fileName);
1969 if (hdr->SizeOfOptionalHeader != 0) {
1970 errorBelch("%s: PEi386 with nonempty optional header", oc->fileName);
1973 if ( /* (hdr->Characteristics & MYIMAGE_FILE_RELOCS_STRIPPED) || */
1974 (hdr->Characteristics & MYIMAGE_FILE_EXECUTABLE_IMAGE) ||
1975 (hdr->Characteristics & MYIMAGE_FILE_DLL) ||
1976 (hdr->Characteristics & MYIMAGE_FILE_SYSTEM) ) {
1977 errorBelch("%s: Not a PEi386 object file", oc->fileName);
1980 if ( (hdr->Characteristics & MYIMAGE_FILE_BYTES_REVERSED_HI)
1981 /* || !(hdr->Characteristics & MYIMAGE_FILE_32BIT_MACHINE) */ ) {
1982 errorBelch("%s: Invalid PEi386 word size or endiannness: %d",
1984 (int)(hdr->Characteristics));
1987 /* If the string table size is way crazy, this might indicate that
1988 there are more than 64k relocations, despite claims to the
1989 contrary. Hence this test. */
1990 /* debugBelch("strtab size %d\n", * (UInt32*)strtab); */
1992 if ( (*(UInt32*)strtab) > 600000 ) {
1993 /* Note that 600k has no special significance other than being
1994 big enough to handle the almost-2MB-sized lumps that
1995 constitute HSwin32*.o. */
1996 debugBelch("PEi386 object has suspiciously large string table; > 64k relocs?");
2001 /* No further verification after this point; only debug printing. */
2003 IF_DEBUG(linker, i=1);
2004 if (i == 0) return 1;
2006 debugBelch( "sectab offset = %d\n", ((UChar*)sectab) - ((UChar*)hdr) );
2007 debugBelch( "symtab offset = %d\n", ((UChar*)symtab) - ((UChar*)hdr) );
2008 debugBelch( "strtab offset = %d\n", ((UChar*)strtab) - ((UChar*)hdr) );
2011 debugBelch( "Machine: 0x%x\n", (UInt32)(hdr->Machine) );
2012 debugBelch( "# sections: %d\n", (UInt32)(hdr->NumberOfSections) );
2013 debugBelch( "time/date: 0x%x\n", (UInt32)(hdr->TimeDateStamp) );
2014 debugBelch( "symtab offset: %d\n", (UInt32)(hdr->PointerToSymbolTable) );
2015 debugBelch( "# symbols: %d\n", (UInt32)(hdr->NumberOfSymbols) );
2016 debugBelch( "sz of opt hdr: %d\n", (UInt32)(hdr->SizeOfOptionalHeader) );
2017 debugBelch( "characteristics: 0x%x\n", (UInt32)(hdr->Characteristics) );
2019 /* Print the section table. */
2021 for (i = 0; i < hdr->NumberOfSections; i++) {
2023 COFF_section* sectab_i
2025 myindex ( sizeof_COFF_section, sectab, i );
2032 printName ( sectab_i->Name, strtab );
2042 sectab_i->VirtualSize,
2043 sectab_i->VirtualAddress,
2044 sectab_i->SizeOfRawData,
2045 sectab_i->PointerToRawData,
2046 sectab_i->NumberOfRelocations,
2047 sectab_i->PointerToRelocations,
2048 sectab_i->PointerToRawData
2050 reltab = (COFF_reloc*) (
2051 ((UChar*)(oc->image)) + sectab_i->PointerToRelocations
2054 if ( sectab_i->Characteristics & MYIMAGE_SCN_LNK_NRELOC_OVFL ) {
2055 /* If the relocation field (a short) has overflowed, the
2056 * real count can be found in the first reloc entry.
2058 * See Section 4.1 (last para) of the PE spec (rev6.0).
2060 COFF_reloc* rel = (COFF_reloc*)
2061 myindex ( sizeof_COFF_reloc, reltab, 0 );
2062 noRelocs = rel->VirtualAddress;
2065 noRelocs = sectab_i->NumberOfRelocations;
2069 for (; j < noRelocs; j++) {
2071 COFF_reloc* rel = (COFF_reloc*)
2072 myindex ( sizeof_COFF_reloc, reltab, j );
2074 " type 0x%-4x vaddr 0x%-8x name `",
2076 rel->VirtualAddress );
2077 sym = (COFF_symbol*)
2078 myindex ( sizeof_COFF_symbol, symtab, rel->SymbolTableIndex );
2079 /* Hmm..mysterious looking offset - what's it for? SOF */
2080 printName ( sym->Name, strtab -10 );
2087 debugBelch("string table has size 0x%x\n", * (UInt32*)strtab );
2088 debugBelch("---START of string table---\n");
2089 for (i = 4; i < *(Int32*)strtab; i++) {
2091 debugBelch("\n"); else
2092 debugBelch("%c", strtab[i] );
2094 debugBelch("--- END of string table---\n");
2099 COFF_symbol* symtab_i;
2100 if (i >= (Int32)(hdr->NumberOfSymbols)) break;
2101 symtab_i = (COFF_symbol*)
2102 myindex ( sizeof_COFF_symbol, symtab, i );
2108 printName ( symtab_i->Name, strtab );
2117 (Int32)(symtab_i->SectionNumber),
2118 (UInt32)symtab_i->Type,
2119 (UInt32)symtab_i->StorageClass,
2120 (UInt32)symtab_i->NumberOfAuxSymbols
2122 i += symtab_i->NumberOfAuxSymbols;
2132 ocGetNames_PEi386 ( ObjectCode* oc )
2135 COFF_section* sectab;
2136 COFF_symbol* symtab;
2143 hdr = (COFF_header*)(oc->image);
2144 sectab = (COFF_section*) (
2145 ((UChar*)(oc->image))
2146 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2148 symtab = (COFF_symbol*) (
2149 ((UChar*)(oc->image))
2150 + hdr->PointerToSymbolTable
2152 strtab = ((UChar*)(oc->image))
2153 + hdr->PointerToSymbolTable
2154 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
2156 /* Allocate space for any (local, anonymous) .bss sections. */
2158 for (i = 0; i < hdr->NumberOfSections; i++) {
2161 COFF_section* sectab_i
2163 myindex ( sizeof_COFF_section, sectab, i );
2164 if (0 != strcmp(sectab_i->Name, ".bss")) continue;
2165 /* sof 10/05: the PE spec text isn't too clear regarding what
2166 * the SizeOfRawData field is supposed to hold for object
2167 * file sections containing just uninitialized data -- for executables,
2168 * it is supposed to be zero; unclear what it's supposed to be
2169 * for object files. However, VirtualSize is guaranteed to be
2170 * zero for object files, which definitely suggests that SizeOfRawData
2171 * will be non-zero (where else would the size of this .bss section be
2172 * stored?) Looking at the COFF_section info for incoming object files,
2173 * this certainly appears to be the case.
2175 * => I suspect we've been incorrectly handling .bss sections in (relocatable)
2176 * object files up until now. This turned out to bite us with ghc-6.4.1's use
2177 * of gcc-3.4.x, which has started to emit initially-zeroed-out local 'static'
2178 * variable decls into to the .bss section. (The specific function in Q which
2179 * triggered this is libraries/base/cbits/dirUtils.c:__hscore_getFolderPath())
2181 if (sectab_i->VirtualSize == 0 && sectab_i->SizeOfRawData == 0) continue;
2182 /* This is a non-empty .bss section. Allocate zeroed space for
2183 it, and set its PointerToRawData field such that oc->image +
2184 PointerToRawData == addr_of_zeroed_space. */
2185 bss_sz = sectab_i->VirtualSize;
2186 if ( bss_sz < sectab_i->SizeOfRawData) { bss_sz = sectab_i->SizeOfRawData; }
2187 zspace = stgCallocBytes(1, bss_sz, "ocGetNames_PEi386(anonymous bss)");
2188 sectab_i->PointerToRawData = ((UChar*)zspace) - ((UChar*)(oc->image));
2189 addProddableBlock(oc, zspace, bss_sz);
2190 /* debugBelch("BSS anon section at 0x%x\n", zspace); */
2193 /* Copy section information into the ObjectCode. */
2195 for (i = 0; i < hdr->NumberOfSections; i++) {
2201 = SECTIONKIND_OTHER;
2202 COFF_section* sectab_i
2204 myindex ( sizeof_COFF_section, sectab, i );
2205 IF_DEBUG(linker, debugBelch("section name = %s\n", sectab_i->Name ));
2208 /* I'm sure this is the Right Way to do it. However, the
2209 alternative of testing the sectab_i->Name field seems to
2210 work ok with Cygwin.
2212 if (sectab_i->Characteristics & MYIMAGE_SCN_CNT_CODE ||
2213 sectab_i->Characteristics & MYIMAGE_SCN_CNT_INITIALIZED_DATA)
2214 kind = SECTIONKIND_CODE_OR_RODATA;
2217 if (0==strcmp(".text",sectab_i->Name) ||
2218 0==strcmp(".rdata",sectab_i->Name)||
2219 0==strcmp(".rodata",sectab_i->Name))
2220 kind = SECTIONKIND_CODE_OR_RODATA;
2221 if (0==strcmp(".data",sectab_i->Name) ||
2222 0==strcmp(".bss",sectab_i->Name))
2223 kind = SECTIONKIND_RWDATA;
2225 ASSERT(sectab_i->SizeOfRawData == 0 || sectab_i->VirtualSize == 0);
2226 sz = sectab_i->SizeOfRawData;
2227 if (sz < sectab_i->VirtualSize) sz = sectab_i->VirtualSize;
2229 start = ((UChar*)(oc->image)) + sectab_i->PointerToRawData;
2230 end = start + sz - 1;
2232 if (kind == SECTIONKIND_OTHER
2233 /* Ignore sections called which contain stabs debugging
2235 && 0 != strcmp(".stab", sectab_i->Name)
2236 && 0 != strcmp(".stabstr", sectab_i->Name)
2237 /* ignore constructor section for now */
2238 && 0 != strcmp(".ctors", sectab_i->Name)
2239 /* ignore section generated from .ident */
2240 && 0!= strcmp("/4", sectab_i->Name)
2242 errorBelch("Unknown PEi386 section name `%s' (while processing: %s)", sectab_i->Name, oc->fileName);
2246 if (kind != SECTIONKIND_OTHER && end >= start) {
2247 addSection(oc, kind, start, end);
2248 addProddableBlock(oc, start, end - start + 1);
2252 /* Copy exported symbols into the ObjectCode. */
2254 oc->n_symbols = hdr->NumberOfSymbols;
2255 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
2256 "ocGetNames_PEi386(oc->symbols)");
2257 /* Call me paranoid; I don't care. */
2258 for (i = 0; i < oc->n_symbols; i++)
2259 oc->symbols[i] = NULL;
2263 COFF_symbol* symtab_i;
2264 if (i >= (Int32)(hdr->NumberOfSymbols)) break;
2265 symtab_i = (COFF_symbol*)
2266 myindex ( sizeof_COFF_symbol, symtab, i );
2270 if (symtab_i->StorageClass == MYIMAGE_SYM_CLASS_EXTERNAL
2271 && symtab_i->SectionNumber != MYIMAGE_SYM_UNDEFINED) {
2272 /* This symbol is global and defined, viz, exported */
2273 /* for MYIMAGE_SYMCLASS_EXTERNAL
2274 && !MYIMAGE_SYM_UNDEFINED,
2275 the address of the symbol is:
2276 address of relevant section + offset in section
2278 COFF_section* sectabent
2279 = (COFF_section*) myindex ( sizeof_COFF_section,
2281 symtab_i->SectionNumber-1 );
2282 addr = ((UChar*)(oc->image))
2283 + (sectabent->PointerToRawData
2287 if (symtab_i->SectionNumber == MYIMAGE_SYM_UNDEFINED
2288 && symtab_i->Value > 0) {
2289 /* This symbol isn't in any section at all, ie, global bss.
2290 Allocate zeroed space for it. */
2291 addr = stgCallocBytes(1, symtab_i->Value,
2292 "ocGetNames_PEi386(non-anonymous bss)");
2293 addSection(oc, SECTIONKIND_RWDATA, addr,
2294 ((UChar*)addr) + symtab_i->Value - 1);
2295 addProddableBlock(oc, addr, symtab_i->Value);
2296 /* debugBelch("BSS section at 0x%x\n", addr); */
2299 if (addr != NULL ) {
2300 sname = cstring_from_COFF_symbol_name ( symtab_i->Name, strtab );
2301 /* debugBelch("addSymbol %p `%s \n", addr,sname); */
2302 IF_DEBUG(linker, debugBelch("addSymbol %p `%s'\n", addr,sname);)
2303 ASSERT(i >= 0 && i < oc->n_symbols);
2304 /* cstring_from_COFF_symbol_name always succeeds. */
2305 oc->symbols[i] = sname;
2306 ghciInsertStrHashTable(oc->fileName, symhash, sname, addr);
2310 "IGNORING symbol %d\n"
2314 printName ( symtab_i->Name, strtab );
2323 (Int32)(symtab_i->SectionNumber),
2324 (UInt32)symtab_i->Type,
2325 (UInt32)symtab_i->StorageClass,
2326 (UInt32)symtab_i->NumberOfAuxSymbols
2331 i += symtab_i->NumberOfAuxSymbols;
2340 ocResolve_PEi386 ( ObjectCode* oc )
2343 COFF_section* sectab;
2344 COFF_symbol* symtab;
2354 /* ToDo: should be variable-sized? But is at least safe in the
2355 sense of buffer-overrun-proof. */
2357 /* debugBelch("resolving for %s\n", oc->fileName); */
2359 hdr = (COFF_header*)(oc->image);
2360 sectab = (COFF_section*) (
2361 ((UChar*)(oc->image))
2362 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2364 symtab = (COFF_symbol*) (
2365 ((UChar*)(oc->image))
2366 + hdr->PointerToSymbolTable
2368 strtab = ((UChar*)(oc->image))
2369 + hdr->PointerToSymbolTable
2370 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
2372 for (i = 0; i < hdr->NumberOfSections; i++) {
2373 COFF_section* sectab_i
2375 myindex ( sizeof_COFF_section, sectab, i );
2378 ((UChar*)(oc->image)) + sectab_i->PointerToRelocations
2381 /* Ignore sections called which contain stabs debugging
2383 if (0 == strcmp(".stab", sectab_i->Name)
2384 || 0 == strcmp(".stabstr", sectab_i->Name)
2385 || 0 == strcmp(".ctors", sectab_i->Name))
2388 if ( sectab_i->Characteristics & MYIMAGE_SCN_LNK_NRELOC_OVFL ) {
2389 /* If the relocation field (a short) has overflowed, the
2390 * real count can be found in the first reloc entry.
2392 * See Section 4.1 (last para) of the PE spec (rev6.0).
2394 * Nov2003 update: the GNU linker still doesn't correctly
2395 * handle the generation of relocatable object files with
2396 * overflown relocations. Hence the output to warn of potential
2399 COFF_reloc* rel = (COFF_reloc*)
2400 myindex ( sizeof_COFF_reloc, reltab, 0 );
2401 noRelocs = rel->VirtualAddress;
2403 /* 10/05: we now assume (and check for) a GNU ld that is capable
2404 * of handling object files with (>2^16) of relocs.
2407 debugBelch("WARNING: Overflown relocation field (# relocs found: %u)\n",
2412 noRelocs = sectab_i->NumberOfRelocations;
2417 for (; j < noRelocs; j++) {
2419 COFF_reloc* reltab_j
2421 myindex ( sizeof_COFF_reloc, reltab, j );
2423 /* the location to patch */
2425 ((UChar*)(oc->image))
2426 + (sectab_i->PointerToRawData
2427 + reltab_j->VirtualAddress
2428 - sectab_i->VirtualAddress )
2430 /* the existing contents of pP */
2432 /* the symbol to connect to */
2433 sym = (COFF_symbol*)
2434 myindex ( sizeof_COFF_symbol,
2435 symtab, reltab_j->SymbolTableIndex );
2438 "reloc sec %2d num %3d: type 0x%-4x "
2439 "vaddr 0x%-8x name `",
2441 (UInt32)reltab_j->Type,
2442 reltab_j->VirtualAddress );
2443 printName ( sym->Name, strtab );
2444 debugBelch("'\n" ));
2446 if (sym->StorageClass == MYIMAGE_SYM_CLASS_STATIC) {
2447 COFF_section* section_sym
2448 = findPEi386SectionCalled ( oc, sym->Name );
2450 errorBelch("%s: can't find section `%s'", oc->fileName, sym->Name);
2453 S = ((UInt32)(oc->image))
2454 + (section_sym->PointerToRawData
2457 copyName ( sym->Name, strtab, symbol, 1000-1 );
2458 S = (UInt32) lookupLocalSymbol( oc, symbol );
2459 if ((void*)S != NULL) goto foundit;
2460 S = (UInt32) lookupSymbol( symbol );
2461 if ((void*)S != NULL) goto foundit;
2462 zapTrailingAtSign ( symbol );
2463 S = (UInt32) lookupLocalSymbol( oc, symbol );
2464 if ((void*)S != NULL) goto foundit;
2465 S = (UInt32) lookupSymbol( symbol );
2466 if ((void*)S != NULL) goto foundit;
2467 /* Newline first because the interactive linker has printed "linking..." */
2468 errorBelch("\n%s: unknown symbol `%s'", oc->fileName, symbol);
2472 checkProddableBlock(oc, pP);
2473 switch (reltab_j->Type) {
2474 case MYIMAGE_REL_I386_DIR32:
2477 case MYIMAGE_REL_I386_REL32:
2478 /* Tricky. We have to insert a displacement at
2479 pP which, when added to the PC for the _next_
2480 insn, gives the address of the target (S).
2481 Problem is to know the address of the next insn
2482 when we only know pP. We assume that this
2483 literal field is always the last in the insn,
2484 so that the address of the next insn is pP+4
2485 -- hence the constant 4.
2486 Also I don't know if A should be added, but so
2487 far it has always been zero.
2489 SOF 05/2005: 'A' (old contents of *pP) have been observed
2490 to contain values other than zero (the 'wx' object file
2491 that came with wxhaskell-0.9.4; dunno how it was compiled..).
2492 So, add displacement to old value instead of asserting
2493 A to be zero. Fixes wxhaskell-related crashes, and no other
2494 ill effects have been observed.
2496 Update: the reason why we're seeing these more elaborate
2497 relocations is due to a switch in how the NCG compiles SRTs
2498 and offsets to them from info tables. SRTs live in .(ro)data,
2499 while info tables live in .text, causing GAS to emit REL32/DISP32
2500 relocations with non-zero values. Adding the displacement is
2501 the right thing to do.
2503 *pP = S - ((UInt32)pP) - 4 + A;
2506 debugBelch("%s: unhandled PEi386 relocation type %d",
2507 oc->fileName, reltab_j->Type);
2514 IF_DEBUG(linker, debugBelch("completed %s", oc->fileName));
2518 #endif /* defined(OBJFORMAT_PEi386) */
2521 /* --------------------------------------------------------------------------
2523 * ------------------------------------------------------------------------*/
2525 #if defined(OBJFORMAT_ELF)
2530 #if defined(sparc_HOST_ARCH)
2531 # define ELF_TARGET_SPARC /* Used inside <elf.h> */
2532 #elif defined(i386_HOST_ARCH)
2533 # define ELF_TARGET_386 /* Used inside <elf.h> */
2534 #elif defined(x86_64_HOST_ARCH)
2535 # define ELF_TARGET_X64_64
2537 #elif defined (ia64_HOST_ARCH)
2538 # define ELF_TARGET_IA64 /* Used inside <elf.h> */
2540 # define ELF_FUNCTION_DESC /* calling convention uses function descriptors */
2541 # define ELF_NEED_GOT /* needs Global Offset Table */
2542 # define ELF_NEED_PLT /* needs Procedure Linkage Tables */
2545 #if !defined(openbsd_HOST_OS)
2548 /* openbsd elf has things in different places, with diff names */
2549 #include <elf_abi.h>
2550 #include <machine/reloc.h>
2551 #define R_386_32 RELOC_32
2552 #define R_386_PC32 RELOC_PC32
2556 * Define a set of types which can be used for both ELF32 and ELF64
2560 #define ELFCLASS ELFCLASS64
2561 #define Elf_Addr Elf64_Addr
2562 #define Elf_Word Elf64_Word
2563 #define Elf_Sword Elf64_Sword
2564 #define Elf_Ehdr Elf64_Ehdr
2565 #define Elf_Phdr Elf64_Phdr
2566 #define Elf_Shdr Elf64_Shdr
2567 #define Elf_Sym Elf64_Sym
2568 #define Elf_Rel Elf64_Rel
2569 #define Elf_Rela Elf64_Rela
2570 #define ELF_ST_TYPE ELF64_ST_TYPE
2571 #define ELF_ST_BIND ELF64_ST_BIND
2572 #define ELF_R_TYPE ELF64_R_TYPE
2573 #define ELF_R_SYM ELF64_R_SYM
2575 #define ELFCLASS ELFCLASS32
2576 #define Elf_Addr Elf32_Addr
2577 #define Elf_Word Elf32_Word
2578 #define Elf_Sword Elf32_Sword
2579 #define Elf_Ehdr Elf32_Ehdr
2580 #define Elf_Phdr Elf32_Phdr
2581 #define Elf_Shdr Elf32_Shdr
2582 #define Elf_Sym Elf32_Sym
2583 #define Elf_Rel Elf32_Rel
2584 #define Elf_Rela Elf32_Rela
2586 #define ELF_ST_TYPE ELF32_ST_TYPE
2589 #define ELF_ST_BIND ELF32_ST_BIND
2592 #define ELF_R_TYPE ELF32_R_TYPE
2595 #define ELF_R_SYM ELF32_R_SYM
2601 * Functions to allocate entries in dynamic sections. Currently we simply
2602 * preallocate a large number, and we don't check if a entry for the given
2603 * target already exists (a linear search is too slow). Ideally these
2604 * entries would be associated with symbols.
2607 /* These sizes sufficient to load HSbase + HShaskell98 + a few modules */
2608 #define GOT_SIZE 0x20000
2609 #define FUNCTION_TABLE_SIZE 0x10000
2610 #define PLT_SIZE 0x08000
2613 static Elf_Addr got[GOT_SIZE];
2614 static unsigned int gotIndex;
2615 static Elf_Addr gp_val = (Elf_Addr)got;
2618 allocateGOTEntry(Elf_Addr target)
2622 if (gotIndex >= GOT_SIZE)
2623 barf("Global offset table overflow");
2625 entry = &got[gotIndex++];
2627 return (Elf_Addr)entry;
2631 #ifdef ELF_FUNCTION_DESC
2637 static FunctionDesc functionTable[FUNCTION_TABLE_SIZE];
2638 static unsigned int functionTableIndex;
2641 allocateFunctionDesc(Elf_Addr target)
2643 FunctionDesc *entry;
2645 if (functionTableIndex >= FUNCTION_TABLE_SIZE)
2646 barf("Function table overflow");
2648 entry = &functionTable[functionTableIndex++];
2650 entry->gp = (Elf_Addr)gp_val;
2651 return (Elf_Addr)entry;
2655 copyFunctionDesc(Elf_Addr target)
2657 FunctionDesc *olddesc = (FunctionDesc *)target;
2658 FunctionDesc *newdesc;
2660 newdesc = (FunctionDesc *)allocateFunctionDesc(olddesc->ip);
2661 newdesc->gp = olddesc->gp;
2662 return (Elf_Addr)newdesc;
2667 #ifdef ia64_HOST_ARCH
2668 static void ia64_reloc_gprel22(Elf_Addr target, Elf_Addr value);
2669 static void ia64_reloc_pcrel21(Elf_Addr target, Elf_Addr value, ObjectCode *oc);
2671 static unsigned char plt_code[] =
2673 /* taken from binutils bfd/elfxx-ia64.c */
2674 0x0b, 0x78, 0x00, 0x02, 0x00, 0x24, /* [MMI] addl r15=0,r1;; */
2675 0x00, 0x41, 0x3c, 0x30, 0x28, 0xc0, /* ld8 r16=[r15],8 */
2676 0x01, 0x08, 0x00, 0x84, /* mov r14=r1;; */
2677 0x11, 0x08, 0x00, 0x1e, 0x18, 0x10, /* [MIB] ld8 r1=[r15] */
2678 0x60, 0x80, 0x04, 0x80, 0x03, 0x00, /* mov b6=r16 */
2679 0x60, 0x00, 0x80, 0x00 /* br.few b6;; */
2682 /* If we can't get to the function descriptor via gp, take a local copy of it */
2683 #define PLT_RELOC(code, target) { \
2684 Elf64_Sxword rel_value = target - gp_val; \
2685 if ((rel_value > 0x1fffff) || (rel_value < -0x1fffff)) \
2686 ia64_reloc_gprel22((Elf_Addr)code, copyFunctionDesc(target)); \
2688 ia64_reloc_gprel22((Elf_Addr)code, target); \
2693 unsigned char code[sizeof(plt_code)];
2697 allocatePLTEntry(Elf_Addr target, ObjectCode *oc)
2699 PLTEntry *plt = (PLTEntry *)oc->plt;
2702 if (oc->pltIndex >= PLT_SIZE)
2703 barf("Procedure table overflow");
2705 entry = &plt[oc->pltIndex++];
2706 memcpy(entry->code, plt_code, sizeof(entry->code));
2707 PLT_RELOC(entry->code, target);
2708 return (Elf_Addr)entry;
2714 return (PLT_SIZE * sizeof(PLTEntry));
2719 #if x86_64_HOST_ARCH
2720 // On x86_64, 32-bit relocations are often used, which requires that
2721 // we can resolve a symbol to a 32-bit offset. However, shared
2722 // libraries are placed outside the 2Gb area, which leaves us with a
2723 // problem when we need to give a 32-bit offset to a symbol in a
2726 // For a function symbol, we can allocate a bounce sequence inside the
2727 // 2Gb area and resolve the symbol to this. The bounce sequence is
2728 // simply a long jump instruction to the real location of the symbol.
2730 // For data references, we're screwed.
2733 unsigned char jmp[8]; /* 6 byte instruction: jmpq *0x00000002(%rip) */
2737 #define X86_64_BB_SIZE 1024
2739 static x86_64_bounce *x86_64_bounce_buffer = NULL;
2740 static nat x86_64_bb_next_off;
2743 x86_64_high_symbol( char *lbl, void *addr )
2745 x86_64_bounce *bounce;
2747 if ( x86_64_bounce_buffer == NULL ||
2748 x86_64_bb_next_off >= X86_64_BB_SIZE ) {
2749 x86_64_bounce_buffer =
2750 mmap(NULL, X86_64_BB_SIZE * sizeof(x86_64_bounce),
2751 PROT_EXEC|PROT_READ|PROT_WRITE,
2752 MAP_PRIVATE|MAP_32BIT|MAP_ANONYMOUS, -1, 0);
2753 if (x86_64_bounce_buffer == MAP_FAILED) {
2754 barf("x86_64_high_symbol: mmap failed");
2756 x86_64_bb_next_off = 0;
2758 bounce = &x86_64_bounce_buffer[x86_64_bb_next_off];
2759 bounce->jmp[0] = 0xff;
2760 bounce->jmp[1] = 0x25;
2761 bounce->jmp[2] = 0x02;
2762 bounce->jmp[3] = 0x00;
2763 bounce->jmp[4] = 0x00;
2764 bounce->jmp[5] = 0x00;
2765 bounce->addr = addr;
2766 x86_64_bb_next_off++;
2768 IF_DEBUG(linker, debugBelch("x86_64: allocated bounce entry for %s->%p at %p\n",
2769 lbl, addr, bounce));
2771 insertStrHashTable(symhash, lbl, bounce);
2778 * Generic ELF functions
2782 findElfSection ( void* objImage, Elf_Word sh_type )
2784 char* ehdrC = (char*)objImage;
2785 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2786 Elf_Shdr* shdr = (Elf_Shdr*)(ehdrC + ehdr->e_shoff);
2787 char* sh_strtab = ehdrC + shdr[ehdr->e_shstrndx].sh_offset;
2791 for (i = 0; i < ehdr->e_shnum; i++) {
2792 if (shdr[i].sh_type == sh_type
2793 /* Ignore the section header's string table. */
2794 && i != ehdr->e_shstrndx
2795 /* Ignore string tables named .stabstr, as they contain
2797 && 0 != memcmp(".stabstr", sh_strtab + shdr[i].sh_name, 8)
2799 ptr = ehdrC + shdr[i].sh_offset;
2806 #if defined(ia64_HOST_ARCH)
2808 findElfSegment ( void* objImage, Elf_Addr vaddr )
2810 char* ehdrC = (char*)objImage;
2811 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2812 Elf_Phdr* phdr = (Elf_Phdr*)(ehdrC + ehdr->e_phoff);
2813 Elf_Addr segaddr = 0;
2816 for (i = 0; i < ehdr->e_phnum; i++) {
2817 segaddr = phdr[i].p_vaddr;
2818 if ((vaddr >= segaddr) && (vaddr < segaddr + phdr[i].p_memsz))
2826 ocVerifyImage_ELF ( ObjectCode* oc )
2830 int i, j, nent, nstrtab, nsymtabs;
2834 char* ehdrC = (char*)(oc->image);
2835 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2837 if (ehdr->e_ident[EI_MAG0] != ELFMAG0 ||
2838 ehdr->e_ident[EI_MAG1] != ELFMAG1 ||
2839 ehdr->e_ident[EI_MAG2] != ELFMAG2 ||
2840 ehdr->e_ident[EI_MAG3] != ELFMAG3) {
2841 errorBelch("%s: not an ELF object", oc->fileName);
2845 if (ehdr->e_ident[EI_CLASS] != ELFCLASS) {
2846 errorBelch("%s: unsupported ELF format", oc->fileName);
2850 if (ehdr->e_ident[EI_DATA] == ELFDATA2LSB) {
2851 IF_DEBUG(linker,debugBelch( "Is little-endian\n" ));
2853 if (ehdr->e_ident[EI_DATA] == ELFDATA2MSB) {
2854 IF_DEBUG(linker,debugBelch( "Is big-endian\n" ));
2856 errorBelch("%s: unknown endiannness", oc->fileName);
2860 if (ehdr->e_type != ET_REL) {
2861 errorBelch("%s: not a relocatable object (.o) file", oc->fileName);
2864 IF_DEBUG(linker, debugBelch( "Is a relocatable object (.o) file\n" ));
2866 IF_DEBUG(linker,debugBelch( "Architecture is " ));
2867 switch (ehdr->e_machine) {
2868 case EM_386: IF_DEBUG(linker,debugBelch( "x86" )); break;
2869 #ifdef EM_SPARC32PLUS
2870 case EM_SPARC32PLUS:
2872 case EM_SPARC: IF_DEBUG(linker,debugBelch( "sparc" )); break;
2874 case EM_IA_64: IF_DEBUG(linker,debugBelch( "ia64" )); break;
2876 case EM_PPC: IF_DEBUG(linker,debugBelch( "powerpc32" )); break;
2878 case EM_X86_64: IF_DEBUG(linker,debugBelch( "x86_64" )); break;
2880 default: IF_DEBUG(linker,debugBelch( "unknown" ));
2881 errorBelch("%s: unknown architecture", oc->fileName);
2885 IF_DEBUG(linker,debugBelch(
2886 "\nSection header table: start %ld, n_entries %d, ent_size %d\n",
2887 (long)ehdr->e_shoff, ehdr->e_shnum, ehdr->e_shentsize ));
2889 ASSERT (ehdr->e_shentsize == sizeof(Elf_Shdr));
2891 shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
2893 if (ehdr->e_shstrndx == SHN_UNDEF) {
2894 errorBelch("%s: no section header string table", oc->fileName);
2897 IF_DEBUG(linker,debugBelch( "Section header string table is section %d\n",
2899 sh_strtab = ehdrC + shdr[ehdr->e_shstrndx].sh_offset;
2902 for (i = 0; i < ehdr->e_shnum; i++) {
2903 IF_DEBUG(linker,debugBelch("%2d: ", i ));
2904 IF_DEBUG(linker,debugBelch("type=%2d ", (int)shdr[i].sh_type ));
2905 IF_DEBUG(linker,debugBelch("size=%4d ", (int)shdr[i].sh_size ));
2906 IF_DEBUG(linker,debugBelch("offs=%4d ", (int)shdr[i].sh_offset ));
2907 IF_DEBUG(linker,debugBelch(" (%p .. %p) ",
2908 ehdrC + shdr[i].sh_offset,
2909 ehdrC + shdr[i].sh_offset + shdr[i].sh_size - 1));
2911 if (shdr[i].sh_type == SHT_REL) {
2912 IF_DEBUG(linker,debugBelch("Rel " ));
2913 } else if (shdr[i].sh_type == SHT_RELA) {
2914 IF_DEBUG(linker,debugBelch("RelA " ));
2916 IF_DEBUG(linker,debugBelch(" "));
2919 IF_DEBUG(linker,debugBelch("sname=%s\n", sh_strtab + shdr[i].sh_name ));
2923 IF_DEBUG(linker,debugBelch( "\nString tables" ));
2926 for (i = 0; i < ehdr->e_shnum; i++) {
2927 if (shdr[i].sh_type == SHT_STRTAB
2928 /* Ignore the section header's string table. */
2929 && i != ehdr->e_shstrndx
2930 /* Ignore string tables named .stabstr, as they contain
2932 && 0 != memcmp(".stabstr", sh_strtab + shdr[i].sh_name, 8)
2934 IF_DEBUG(linker,debugBelch(" section %d is a normal string table", i ));
2935 strtab = ehdrC + shdr[i].sh_offset;
2940 errorBelch("%s: no string tables, or too many", oc->fileName);
2945 IF_DEBUG(linker,debugBelch( "\nSymbol tables" ));
2946 for (i = 0; i < ehdr->e_shnum; i++) {
2947 if (shdr[i].sh_type != SHT_SYMTAB) continue;
2948 IF_DEBUG(linker,debugBelch( "section %d is a symbol table\n", i ));
2950 stab = (Elf_Sym*) (ehdrC + shdr[i].sh_offset);
2951 nent = shdr[i].sh_size / sizeof(Elf_Sym);
2952 IF_DEBUG(linker,debugBelch( " number of entries is apparently %d (%ld rem)\n",
2954 (long)shdr[i].sh_size % sizeof(Elf_Sym)
2956 if (0 != shdr[i].sh_size % sizeof(Elf_Sym)) {
2957 errorBelch("%s: non-integral number of symbol table entries", oc->fileName);
2960 for (j = 0; j < nent; j++) {
2961 IF_DEBUG(linker,debugBelch(" %2d ", j ));
2962 IF_DEBUG(linker,debugBelch(" sec=%-5d size=%-3d val=%5p ",
2963 (int)stab[j].st_shndx,
2964 (int)stab[j].st_size,
2965 (char*)stab[j].st_value ));
2967 IF_DEBUG(linker,debugBelch("type=" ));
2968 switch (ELF_ST_TYPE(stab[j].st_info)) {
2969 case STT_NOTYPE: IF_DEBUG(linker,debugBelch("notype " )); break;
2970 case STT_OBJECT: IF_DEBUG(linker,debugBelch("object " )); break;
2971 case STT_FUNC : IF_DEBUG(linker,debugBelch("func " )); break;
2972 case STT_SECTION: IF_DEBUG(linker,debugBelch("section" )); break;
2973 case STT_FILE: IF_DEBUG(linker,debugBelch("file " )); break;
2974 default: IF_DEBUG(linker,debugBelch("? " )); break;
2976 IF_DEBUG(linker,debugBelch(" " ));
2978 IF_DEBUG(linker,debugBelch("bind=" ));
2979 switch (ELF_ST_BIND(stab[j].st_info)) {
2980 case STB_LOCAL : IF_DEBUG(linker,debugBelch("local " )); break;
2981 case STB_GLOBAL: IF_DEBUG(linker,debugBelch("global" )); break;
2982 case STB_WEAK : IF_DEBUG(linker,debugBelch("weak " )); break;
2983 default: IF_DEBUG(linker,debugBelch("? " )); break;
2985 IF_DEBUG(linker,debugBelch(" " ));
2987 IF_DEBUG(linker,debugBelch("name=%s\n", strtab + stab[j].st_name ));
2991 if (nsymtabs == 0) {
2992 errorBelch("%s: didn't find any symbol tables", oc->fileName);
2999 static int getSectionKind_ELF( Elf_Shdr *hdr, int *is_bss )
3003 if (hdr->sh_type == SHT_PROGBITS
3004 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_EXECINSTR)) {
3005 /* .text-style section */
3006 return SECTIONKIND_CODE_OR_RODATA;
3009 if (hdr->sh_type == SHT_PROGBITS
3010 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_WRITE)) {
3011 /* .data-style section */
3012 return SECTIONKIND_RWDATA;
3015 if (hdr->sh_type == SHT_PROGBITS
3016 && (hdr->sh_flags & SHF_ALLOC) && !(hdr->sh_flags & SHF_WRITE)) {
3017 /* .rodata-style section */
3018 return SECTIONKIND_CODE_OR_RODATA;
3021 if (hdr->sh_type == SHT_NOBITS
3022 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_WRITE)) {
3023 /* .bss-style section */
3025 return SECTIONKIND_RWDATA;
3028 return SECTIONKIND_OTHER;
3033 ocGetNames_ELF ( ObjectCode* oc )
3038 char* ehdrC = (char*)(oc->image);
3039 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
3040 char* strtab = findElfSection ( ehdrC, SHT_STRTAB );
3041 Elf_Shdr* shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
3043 ASSERT(symhash != NULL);
3046 errorBelch("%s: no strtab", oc->fileName);
3051 for (i = 0; i < ehdr->e_shnum; i++) {
3052 /* Figure out what kind of section it is. Logic derived from
3053 Figure 1.14 ("Special Sections") of the ELF document
3054 ("Portable Formats Specification, Version 1.1"). */
3056 SectionKind kind = getSectionKind_ELF(&shdr[i], &is_bss);
3058 if (is_bss && shdr[i].sh_size > 0) {
3059 /* This is a non-empty .bss section. Allocate zeroed space for
3060 it, and set its .sh_offset field such that
3061 ehdrC + .sh_offset == addr_of_zeroed_space. */
3062 char* zspace = stgCallocBytes(1, shdr[i].sh_size,
3063 "ocGetNames_ELF(BSS)");
3064 shdr[i].sh_offset = ((char*)zspace) - ((char*)ehdrC);
3066 debugBelch("BSS section at 0x%x, size %d\n",
3067 zspace, shdr[i].sh_size);
3071 /* fill in the section info */
3072 if (kind != SECTIONKIND_OTHER && shdr[i].sh_size > 0) {
3073 addProddableBlock(oc, ehdrC + shdr[i].sh_offset, shdr[i].sh_size);
3074 addSection(oc, kind, ehdrC + shdr[i].sh_offset,
3075 ehdrC + shdr[i].sh_offset + shdr[i].sh_size - 1);
3078 if (shdr[i].sh_type != SHT_SYMTAB) continue;
3080 /* copy stuff into this module's object symbol table */
3081 stab = (Elf_Sym*) (ehdrC + shdr[i].sh_offset);
3082 nent = shdr[i].sh_size / sizeof(Elf_Sym);
3084 oc->n_symbols = nent;
3085 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
3086 "ocGetNames_ELF(oc->symbols)");
3088 for (j = 0; j < nent; j++) {
3090 char isLocal = FALSE; /* avoids uninit-var warning */
3092 char* nm = strtab + stab[j].st_name;
3093 int secno = stab[j].st_shndx;
3095 /* Figure out if we want to add it; if so, set ad to its
3096 address. Otherwise leave ad == NULL. */
3098 if (secno == SHN_COMMON) {
3100 ad = stgCallocBytes(1, stab[j].st_size, "ocGetNames_ELF(COMMON)");
3102 debugBelch("COMMON symbol, size %d name %s\n",
3103 stab[j].st_size, nm);
3105 /* Pointless to do addProddableBlock() for this area,
3106 since the linker should never poke around in it. */
3109 if ( ( ELF_ST_BIND(stab[j].st_info)==STB_GLOBAL
3110 || ELF_ST_BIND(stab[j].st_info)==STB_LOCAL
3112 /* and not an undefined symbol */
3113 && stab[j].st_shndx != SHN_UNDEF
3114 /* and not in a "special section" */
3115 && stab[j].st_shndx < SHN_LORESERVE
3117 /* and it's a not a section or string table or anything silly */
3118 ( ELF_ST_TYPE(stab[j].st_info)==STT_FUNC ||
3119 ELF_ST_TYPE(stab[j].st_info)==STT_OBJECT ||
3120 ELF_ST_TYPE(stab[j].st_info)==STT_NOTYPE
3123 /* Section 0 is the undefined section, hence > and not >=. */
3124 ASSERT(secno > 0 && secno < ehdr->e_shnum);
3126 if (shdr[secno].sh_type == SHT_NOBITS) {
3127 debugBelch(" BSS symbol, size %d off %d name %s\n",
3128 stab[j].st_size, stab[j].st_value, nm);
3131 ad = ehdrC + shdr[ secno ].sh_offset + stab[j].st_value;
3132 if (ELF_ST_BIND(stab[j].st_info)==STB_LOCAL) {
3135 #ifdef ELF_FUNCTION_DESC
3136 /* dlsym() and the initialisation table both give us function
3137 * descriptors, so to be consistent we store function descriptors
3138 * in the symbol table */
3139 if (ELF_ST_TYPE(stab[j].st_info) == STT_FUNC)
3140 ad = (char *)allocateFunctionDesc((Elf_Addr)ad);
3142 IF_DEBUG(linker,debugBelch( "addOTabName(GLOB): %10p %s %s",
3143 ad, oc->fileName, nm ));
3148 /* And the decision is ... */
3152 oc->symbols[j] = nm;
3155 /* Ignore entirely. */
3157 ghciInsertStrHashTable(oc->fileName, symhash, nm, ad);
3161 IF_DEBUG(linker,debugBelch( "skipping `%s'\n",
3162 strtab + stab[j].st_name ));
3165 "skipping bind = %d, type = %d, shndx = %d `%s'\n",
3166 (int)ELF_ST_BIND(stab[j].st_info),
3167 (int)ELF_ST_TYPE(stab[j].st_info),
3168 (int)stab[j].st_shndx,
3169 strtab + stab[j].st_name
3172 oc->symbols[j] = NULL;
3181 /* Do ELF relocations which lack an explicit addend. All x86-linux
3182 relocations appear to be of this form. */
3184 do_Elf_Rel_relocations ( ObjectCode* oc, char* ehdrC,
3185 Elf_Shdr* shdr, int shnum,
3186 Elf_Sym* stab, char* strtab )
3191 Elf_Rel* rtab = (Elf_Rel*) (ehdrC + shdr[shnum].sh_offset);
3192 int nent = shdr[shnum].sh_size / sizeof(Elf_Rel);
3193 int target_shndx = shdr[shnum].sh_info;
3194 int symtab_shndx = shdr[shnum].sh_link;
3196 stab = (Elf_Sym*) (ehdrC + shdr[ symtab_shndx ].sh_offset);
3197 targ = (Elf_Word*)(ehdrC + shdr[ target_shndx ].sh_offset);
3198 IF_DEBUG(linker,debugBelch( "relocations for section %d using symtab %d\n",
3199 target_shndx, symtab_shndx ));
3201 /* Skip sections that we're not interested in. */
3204 SectionKind kind = getSectionKind_ELF(&shdr[target_shndx], &is_bss);
3205 if (kind == SECTIONKIND_OTHER) {
3206 IF_DEBUG(linker,debugBelch( "skipping (target section not loaded)"));
3211 for (j = 0; j < nent; j++) {
3212 Elf_Addr offset = rtab[j].r_offset;
3213 Elf_Addr info = rtab[j].r_info;
3215 Elf_Addr P = ((Elf_Addr)targ) + offset;
3216 Elf_Word* pP = (Elf_Word*)P;
3221 StgStablePtr stablePtr;
3224 IF_DEBUG(linker,debugBelch( "Rel entry %3d is raw(%6p %6p)",
3225 j, (void*)offset, (void*)info ));
3227 IF_DEBUG(linker,debugBelch( " ZERO" ));
3230 Elf_Sym sym = stab[ELF_R_SYM(info)];
3231 /* First see if it is a local symbol. */
3232 if (ELF_ST_BIND(sym.st_info) == STB_LOCAL) {
3233 /* Yes, so we can get the address directly from the ELF symbol
3235 symbol = sym.st_name==0 ? "(noname)" : strtab+sym.st_name;
3237 (ehdrC + shdr[ sym.st_shndx ].sh_offset
3238 + stab[ELF_R_SYM(info)].st_value);
3241 symbol = strtab + sym.st_name;
3242 stablePtr = (StgStablePtr)lookupHashTable(stablehash, (StgWord)symbol);
3243 if (NULL == stablePtr) {
3244 /* No, so look up the name in our global table. */
3245 S_tmp = lookupSymbol( symbol );
3246 S = (Elf_Addr)S_tmp;
3248 stableVal = deRefStablePtr( stablePtr );
3250 S = (Elf_Addr)S_tmp;
3254 errorBelch("%s: unknown symbol `%s'", oc->fileName, symbol);
3257 IF_DEBUG(linker,debugBelch( "`%s' resolves to %p\n", symbol, (void*)S ));
3260 IF_DEBUG(linker,debugBelch( "Reloc: P = %p S = %p A = %p\n",
3261 (void*)P, (void*)S, (void*)A ));
3262 checkProddableBlock ( oc, pP );
3266 switch (ELF_R_TYPE(info)) {
3267 # ifdef i386_HOST_ARCH
3268 case R_386_32: *pP = value; break;
3269 case R_386_PC32: *pP = value - P; break;
3272 errorBelch("%s: unhandled ELF relocation(Rel) type %lu\n",
3273 oc->fileName, (lnat)ELF_R_TYPE(info));
3281 /* Do ELF relocations for which explicit addends are supplied.
3282 sparc-solaris relocations appear to be of this form. */
3284 do_Elf_Rela_relocations ( ObjectCode* oc, char* ehdrC,
3285 Elf_Shdr* shdr, int shnum,
3286 Elf_Sym* stab, char* strtab )
3289 char *symbol = NULL;
3291 Elf_Rela* rtab = (Elf_Rela*) (ehdrC + shdr[shnum].sh_offset);
3292 int nent = shdr[shnum].sh_size / sizeof(Elf_Rela);
3293 int target_shndx = shdr[shnum].sh_info;
3294 int symtab_shndx = shdr[shnum].sh_link;
3296 stab = (Elf_Sym*) (ehdrC + shdr[ symtab_shndx ].sh_offset);
3297 targ = (Elf_Addr) (ehdrC + shdr[ target_shndx ].sh_offset);
3298 IF_DEBUG(linker,debugBelch( "relocations for section %d using symtab %d\n",
3299 target_shndx, symtab_shndx ));
3301 for (j = 0; j < nent; j++) {
3302 #if defined(DEBUG) || defined(sparc_HOST_ARCH) || defined(ia64_HOST_ARCH) || defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH)
3303 /* This #ifdef only serves to avoid unused-var warnings. */
3304 Elf_Addr offset = rtab[j].r_offset;
3305 Elf_Addr P = targ + offset;
3307 Elf_Addr info = rtab[j].r_info;
3308 Elf_Addr A = rtab[j].r_addend;
3312 # if defined(sparc_HOST_ARCH)
3313 Elf_Word* pP = (Elf_Word*)P;
3315 # elif defined(ia64_HOST_ARCH)
3316 Elf64_Xword *pP = (Elf64_Xword *)P;
3318 # elif defined(powerpc_HOST_ARCH)
3322 IF_DEBUG(linker,debugBelch( "Rel entry %3d is raw(%6p %6p %6p) ",
3323 j, (void*)offset, (void*)info,
3326 IF_DEBUG(linker,debugBelch( " ZERO" ));
3329 Elf_Sym sym = stab[ELF_R_SYM(info)];
3330 /* First see if it is a local symbol. */
3331 if (ELF_ST_BIND(sym.st_info) == STB_LOCAL) {
3332 /* Yes, so we can get the address directly from the ELF symbol
3334 symbol = sym.st_name==0 ? "(noname)" : strtab+sym.st_name;
3336 (ehdrC + shdr[ sym.st_shndx ].sh_offset
3337 + stab[ELF_R_SYM(info)].st_value);
3338 #ifdef ELF_FUNCTION_DESC
3339 /* Make a function descriptor for this function */
3340 if (S && ELF_ST_TYPE(sym.st_info) == STT_FUNC) {
3341 S = allocateFunctionDesc(S + A);
3346 /* No, so look up the name in our global table. */
3347 symbol = strtab + sym.st_name;
3348 S_tmp = lookupSymbol( symbol );
3349 S = (Elf_Addr)S_tmp;
3351 #ifdef ELF_FUNCTION_DESC
3352 /* If a function, already a function descriptor - we would
3353 have to copy it to add an offset. */
3354 if (S && (ELF_ST_TYPE(sym.st_info) == STT_FUNC) && (A != 0))
3355 errorBelch("%s: function %s with addend %p", oc->fileName, symbol, (void *)A);
3359 errorBelch("%s: unknown symbol `%s'", oc->fileName, symbol);
3362 IF_DEBUG(linker,debugBelch( "`%s' resolves to %p", symbol, (void*)S ));
3365 IF_DEBUG(linker,debugBelch("Reloc: P = %p S = %p A = %p\n",
3366 (void*)P, (void*)S, (void*)A ));
3367 /* checkProddableBlock ( oc, (void*)P ); */
3371 switch (ELF_R_TYPE(info)) {
3372 # if defined(sparc_HOST_ARCH)
3373 case R_SPARC_WDISP30:
3374 w1 = *pP & 0xC0000000;
3375 w2 = (Elf_Word)((value - P) >> 2);
3376 ASSERT((w2 & 0xC0000000) == 0);
3381 w1 = *pP & 0xFFC00000;
3382 w2 = (Elf_Word)(value >> 10);
3383 ASSERT((w2 & 0xFFC00000) == 0);
3389 w2 = (Elf_Word)(value & 0x3FF);
3390 ASSERT((w2 & ~0x3FF) == 0);
3394 /* According to the Sun documentation:
3396 This relocation type resembles R_SPARC_32, except it refers to an
3397 unaligned word. That is, the word to be relocated must be treated
3398 as four separate bytes with arbitrary alignment, not as a word
3399 aligned according to the architecture requirements.
3401 (JRS: which means that freeloading on the R_SPARC_32 case
3402 is probably wrong, but hey ...)
3406 w2 = (Elf_Word)value;
3409 # elif defined(ia64_HOST_ARCH)
3410 case R_IA64_DIR64LSB:
3411 case R_IA64_FPTR64LSB:
3414 case R_IA64_PCREL64LSB:
3417 case R_IA64_SEGREL64LSB:
3418 addr = findElfSegment(ehdrC, value);
3421 case R_IA64_GPREL22:
3422 ia64_reloc_gprel22(P, value);
3424 case R_IA64_LTOFF22:
3425 case R_IA64_LTOFF22X:
3426 case R_IA64_LTOFF_FPTR22:
3427 addr = allocateGOTEntry(value);
3428 ia64_reloc_gprel22(P, addr);
3430 case R_IA64_PCREL21B:
3431 ia64_reloc_pcrel21(P, S, oc);
3434 /* This goes with R_IA64_LTOFF22X and points to the load to
3435 * convert into a move. We don't implement relaxation. */
3437 # elif defined(powerpc_HOST_ARCH)
3438 case R_PPC_ADDR16_LO:
3439 *(Elf32_Half*) P = value;
3442 case R_PPC_ADDR16_HI:
3443 *(Elf32_Half*) P = value >> 16;
3446 case R_PPC_ADDR16_HA:
3447 *(Elf32_Half*) P = (value + 0x8000) >> 16;
3451 *(Elf32_Word *) P = value;
3455 *(Elf32_Word *) P = value - P;
3461 if( delta << 6 >> 6 != delta )
3463 value = makeJumpIsland( oc, ELF_R_SYM(info), value );
3466 if( value == 0 || delta << 6 >> 6 != delta )
3468 barf( "Unable to make ppcJumpIsland for #%d",
3474 *(Elf_Word *) P = (*(Elf_Word *) P & 0xfc000003)
3475 | (delta & 0x3fffffc);
3479 #if x86_64_HOST_ARCH
3481 *(Elf64_Xword *)P = value;
3486 StgInt64 off = value - P;
3487 if (off >= 0x7fffffffL || off < -0x80000000L) {
3488 barf("R_X86_64_PC32 relocation out of range: %s = %p",
3491 *(Elf64_Word *)P = (Elf64_Word)off;
3496 if (value >= 0x7fffffffL) {
3497 barf("R_X86_64_32 relocation out of range: %s = %p\n",
3500 *(Elf64_Word *)P = (Elf64_Word)value;
3504 if ((StgInt64)value > 0x7fffffffL || (StgInt64)value < -0x80000000L) {
3505 barf("R_X86_64_32S relocation out of range: %s = %p\n",
3508 *(Elf64_Sword *)P = (Elf64_Sword)value;
3513 errorBelch("%s: unhandled ELF relocation(RelA) type %lu\n",
3514 oc->fileName, (lnat)ELF_R_TYPE(info));
3523 ocResolve_ELF ( ObjectCode* oc )
3527 Elf_Sym* stab = NULL;
3528 char* ehdrC = (char*)(oc->image);
3529 Elf_Ehdr* ehdr = (Elf_Ehdr*) ehdrC;
3530 Elf_Shdr* shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
3532 /* first find "the" symbol table */
3533 stab = (Elf_Sym*) findElfSection ( ehdrC, SHT_SYMTAB );
3535 /* also go find the string table */
3536 strtab = findElfSection ( ehdrC, SHT_STRTAB );
3538 if (stab == NULL || strtab == NULL) {
3539 errorBelch("%s: can't find string or symbol table", oc->fileName);
3543 /* Process the relocation sections. */
3544 for (shnum = 0; shnum < ehdr->e_shnum; shnum++) {
3545 if (shdr[shnum].sh_type == SHT_REL) {
3546 ok = do_Elf_Rel_relocations ( oc, ehdrC, shdr,
3547 shnum, stab, strtab );
3551 if (shdr[shnum].sh_type == SHT_RELA) {
3552 ok = do_Elf_Rela_relocations ( oc, ehdrC, shdr,
3553 shnum, stab, strtab );
3558 /* Free the local symbol table; we won't need it again. */
3559 freeHashTable(oc->lochash, NULL);
3562 #if defined(powerpc_HOST_ARCH)
3563 ocFlushInstructionCache( oc );
3571 * Instructions are 41 bits long, packed into 128 bit bundles with a 5-bit template
3572 * at the front. The following utility functions pack and unpack instructions, and
3573 * take care of the most common relocations.
3576 #ifdef ia64_HOST_ARCH
3579 ia64_extract_instruction(Elf64_Xword *target)
3582 int slot = (Elf_Addr)target & 3;
3583 target = (Elf_Addr)target & ~3;
3591 return ((w1 >> 5) & 0x1ffffffffff);
3593 return (w1 >> 46) | ((w2 & 0x7fffff) << 18);
3597 barf("ia64_extract_instruction: invalid slot %p", target);
3602 ia64_deposit_instruction(Elf64_Xword *target, Elf64_Xword value)
3604 int slot = (Elf_Addr)target & 3;
3605 target = (Elf_Addr)target & ~3;
3610 *target |= value << 5;
3613 *target |= value << 46;
3614 *(target+1) |= value >> 18;
3617 *(target+1) |= value << 23;
3623 ia64_reloc_gprel22(Elf_Addr target, Elf_Addr value)
3625 Elf64_Xword instruction;
3626 Elf64_Sxword rel_value;
3628 rel_value = value - gp_val;
3629 if ((rel_value > 0x1fffff) || (rel_value < -0x1fffff))
3630 barf("GP-relative data out of range (address = 0x%lx, gp = 0x%lx)", value, gp_val);
3632 instruction = ia64_extract_instruction((Elf64_Xword *)target);
3633 instruction |= (((rel_value >> 0) & 0x07f) << 13) /* imm7b */
3634 | (((rel_value >> 7) & 0x1ff) << 27) /* imm9d */
3635 | (((rel_value >> 16) & 0x01f) << 22) /* imm5c */
3636 | ((Elf64_Xword)(rel_value < 0) << 36); /* s */
3637 ia64_deposit_instruction((Elf64_Xword *)target, instruction);
3641 ia64_reloc_pcrel21(Elf_Addr target, Elf_Addr value, ObjectCode *oc)
3643 Elf64_Xword instruction;
3644 Elf64_Sxword rel_value;
3647 entry = allocatePLTEntry(value, oc);
3649 rel_value = (entry >> 4) - (target >> 4);
3650 if ((rel_value > 0xfffff) || (rel_value < -0xfffff))
3651 barf("PLT entry too far away (entry = 0x%lx, target = 0x%lx)", entry, target);
3653 instruction = ia64_extract_instruction((Elf64_Xword *)target);
3654 instruction |= ((rel_value & 0xfffff) << 13) /* imm20b */
3655 | ((Elf64_Xword)(rel_value < 0) << 36); /* s */
3656 ia64_deposit_instruction((Elf64_Xword *)target, instruction);
3662 * PowerPC ELF specifics
3665 #ifdef powerpc_HOST_ARCH
3667 static int ocAllocateJumpIslands_ELF( ObjectCode *oc )
3673 ehdr = (Elf_Ehdr *) oc->image;
3674 shdr = (Elf_Shdr *) ( ((char *)oc->image) + ehdr->e_shoff );
3676 for( i = 0; i < ehdr->e_shnum; i++ )
3677 if( shdr[i].sh_type == SHT_SYMTAB )
3680 if( i == ehdr->e_shnum )
3682 errorBelch( "This ELF file contains no symtab" );
3686 if( shdr[i].sh_entsize != sizeof( Elf_Sym ) )
3688 errorBelch( "The entry size (%d) of the symtab isn't %d\n",
3689 shdr[i].sh_entsize, sizeof( Elf_Sym ) );
3694 return ocAllocateJumpIslands( oc, shdr[i].sh_size / sizeof( Elf_Sym ), 0 );
3697 #endif /* powerpc */
3701 /* --------------------------------------------------------------------------
3703 * ------------------------------------------------------------------------*/
3705 #if defined(OBJFORMAT_MACHO)
3708 Support for MachO linking on Darwin/MacOS X
3709 by Wolfgang Thaller (wolfgang.thaller@gmx.net)
3711 I hereby formally apologize for the hackish nature of this code.
3712 Things that need to be done:
3713 *) implement ocVerifyImage_MachO
3714 *) add still more sanity checks.
3717 #ifdef powerpc_HOST_ARCH
3718 static int ocAllocateJumpIslands_MachO(ObjectCode* oc)
3720 struct mach_header *header = (struct mach_header *) oc->image;
3721 struct load_command *lc = (struct load_command *) (header + 1);
3724 for( i = 0; i < header->ncmds; i++ )
3726 if( lc->cmd == LC_SYMTAB )
3728 // Find out the first and last undefined external
3729 // symbol, so we don't have to allocate too many
3731 struct symtab_command *symLC = (struct symtab_command *) lc;
3732 unsigned min = symLC->nsyms, max = 0;
3733 struct nlist *nlist =
3734 symLC ? (struct nlist*) ((char*) oc->image + symLC->symoff)
3736 for(i=0;i<symLC->nsyms;i++)
3738 if(nlist[i].n_type & N_STAB)
3740 else if(nlist[i].n_type & N_EXT)
3742 if((nlist[i].n_type & N_TYPE) == N_UNDF
3743 && (nlist[i].n_value == 0))
3753 return ocAllocateJumpIslands(oc, max - min + 1, min);
3758 lc = (struct load_command *) ( ((char *)lc) + lc->cmdsize );
3760 return ocAllocateJumpIslands(oc,0,0);
3764 static int ocVerifyImage_MachO(ObjectCode* oc STG_UNUSED)
3766 // FIXME: do some verifying here
3770 static int resolveImports(
3773 struct symtab_command *symLC,
3774 struct section *sect, // ptr to lazy or non-lazy symbol pointer section
3775 unsigned long *indirectSyms,
3776 struct nlist *nlist)
3779 size_t itemSize = 4;
3782 int isJumpTable = 0;
3783 if(!strcmp(sect->sectname,"__jump_table"))
3787 ASSERT(sect->reserved2 == itemSize);
3791 for(i=0; i*itemSize < sect->size;i++)
3793 // according to otool, reserved1 contains the first index into the indirect symbol table
3794 struct nlist *symbol = &nlist[indirectSyms[sect->reserved1+i]];
3795 char *nm = image + symLC->stroff + symbol->n_un.n_strx;
3798 if((symbol->n_type & N_TYPE) == N_UNDF
3799 && (symbol->n_type & N_EXT) && (symbol->n_value != 0))
3800 addr = (void*) (symbol->n_value);
3801 else if((addr = lookupLocalSymbol(oc,nm)) != NULL)
3804 addr = lookupSymbol(nm);
3807 errorBelch("\n%s: unknown symbol `%s'", oc->fileName, nm);
3815 checkProddableBlock(oc,image + sect->offset + i*itemSize);
3816 *(image + sect->offset + i*itemSize) = 0xe9; // jmp
3817 *(unsigned*)(image + sect->offset + i*itemSize + 1)
3818 = (char*)addr - (image + sect->offset + i*itemSize + 5);
3823 checkProddableBlock(oc,((void**)(image + sect->offset)) + i);
3824 ((void**)(image + sect->offset))[i] = addr;
3831 static unsigned long relocateAddress(
3834 struct section* sections,
3835 unsigned long address)
3838 for(i = 0; i < nSections; i++)
3840 if(sections[i].addr <= address
3841 && address < sections[i].addr + sections[i].size)
3843 return (unsigned long)oc->image
3844 + sections[i].offset + address - sections[i].addr;
3847 barf("Invalid Mach-O file:"
3848 "Address out of bounds while relocating object file");
3852 static int relocateSection(
3855 struct symtab_command *symLC, struct nlist *nlist,
3856 int nSections, struct section* sections, struct section *sect)
3858 struct relocation_info *relocs;
3861 if(!strcmp(sect->sectname,"__la_symbol_ptr"))
3863 else if(!strcmp(sect->sectname,"__nl_symbol_ptr"))
3865 else if(!strcmp(sect->sectname,"__la_sym_ptr2"))
3867 else if(!strcmp(sect->sectname,"__la_sym_ptr3"))
3871 relocs = (struct relocation_info*) (image + sect->reloff);
3875 if(relocs[i].r_address & R_SCATTERED)
3877 struct scattered_relocation_info *scat =
3878 (struct scattered_relocation_info*) &relocs[i];
3882 if(scat->r_length == 2)
3884 unsigned long word = 0;
3885 unsigned long* wordPtr = (unsigned long*) (image + sect->offset + scat->r_address);
3886 checkProddableBlock(oc,wordPtr);
3888 // Note on relocation types:
3889 // i386 uses the GENERIC_RELOC_* types,
3890 // while ppc uses special PPC_RELOC_* types.
3891 // *_RELOC_VANILLA and *_RELOC_PAIR have the same value
3892 // in both cases, all others are different.
3893 // Therefore, we use GENERIC_RELOC_VANILLA
3894 // and GENERIC_RELOC_PAIR instead of the PPC variants,
3895 // and use #ifdefs for the other types.
3897 // Step 1: Figure out what the relocated value should be
3898 if(scat->r_type == GENERIC_RELOC_VANILLA)
3900 word = *wordPtr + (unsigned long) relocateAddress(
3907 #ifdef powerpc_HOST_ARCH
3908 else if(scat->r_type == PPC_RELOC_SECTDIFF
3909 || scat->r_type == PPC_RELOC_LO16_SECTDIFF
3910 || scat->r_type == PPC_RELOC_HI16_SECTDIFF
3911 || scat->r_type == PPC_RELOC_HA16_SECTDIFF)
3913 else if(scat->r_type == GENERIC_RELOC_SECTDIFF)
3916 struct scattered_relocation_info *pair =
3917 (struct scattered_relocation_info*) &relocs[i+1];
3919 if(!pair->r_scattered || pair->r_type != GENERIC_RELOC_PAIR)
3920 barf("Invalid Mach-O file: "
3921 "RELOC_*_SECTDIFF not followed by RELOC_PAIR");
3923 word = (unsigned long)
3924 (relocateAddress(oc, nSections, sections, scat->r_value)
3925 - relocateAddress(oc, nSections, sections, pair->r_value));
3928 #ifdef powerpc_HOST_ARCH
3929 else if(scat->r_type == PPC_RELOC_HI16
3930 || scat->r_type == PPC_RELOC_LO16
3931 || scat->r_type == PPC_RELOC_HA16
3932 || scat->r_type == PPC_RELOC_LO14)
3933 { // these are generated by label+offset things
3934 struct relocation_info *pair = &relocs[i+1];
3935 if((pair->r_address & R_SCATTERED) || pair->r_type != PPC_RELOC_PAIR)
3936 barf("Invalid Mach-O file: "
3937 "PPC_RELOC_* not followed by PPC_RELOC_PAIR");
3939 if(scat->r_type == PPC_RELOC_LO16)
3941 word = ((unsigned short*) wordPtr)[1];
3942 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
3944 else if(scat->r_type == PPC_RELOC_LO14)
3946 barf("Unsupported Relocation: PPC_RELOC_LO14");
3947 word = ((unsigned short*) wordPtr)[1] & 0xFFFC;
3948 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
3950 else if(scat->r_type == PPC_RELOC_HI16)
3952 word = ((unsigned short*) wordPtr)[1] << 16;
3953 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF);
3955 else if(scat->r_type == PPC_RELOC_HA16)
3957 word = ((unsigned short*) wordPtr)[1] << 16;
3958 word += ((short)relocs[i+1].r_address & (short)0xFFFF);
3962 word += (unsigned long) relocateAddress(oc, nSections, sections, scat->r_value)
3969 continue; // ignore the others
3971 #ifdef powerpc_HOST_ARCH
3972 if(scat->r_type == GENERIC_RELOC_VANILLA
3973 || scat->r_type == PPC_RELOC_SECTDIFF)
3975 if(scat->r_type == GENERIC_RELOC_VANILLA
3976 || scat->r_type == GENERIC_RELOC_SECTDIFF)
3981 #ifdef powerpc_HOST_ARCH
3982 else if(scat->r_type == PPC_RELOC_LO16_SECTDIFF || scat->r_type == PPC_RELOC_LO16)
3984 ((unsigned short*) wordPtr)[1] = word & 0xFFFF;
3986 else if(scat->r_type == PPC_RELOC_HI16_SECTDIFF || scat->r_type == PPC_RELOC_HI16)
3988 ((unsigned short*) wordPtr)[1] = (word >> 16) & 0xFFFF;
3990 else if(scat->r_type == PPC_RELOC_HA16_SECTDIFF || scat->r_type == PPC_RELOC_HA16)
3992 ((unsigned short*) wordPtr)[1] = ((word >> 16) & 0xFFFF)
3993 + ((word & (1<<15)) ? 1 : 0);
3999 continue; // FIXME: I hope it's OK to ignore all the others.
4003 struct relocation_info *reloc = &relocs[i];
4004 if(reloc->r_pcrel && !reloc->r_extern)
4007 if(reloc->r_length == 2)
4009 unsigned long word = 0;
4010 #ifdef powerpc_HOST_ARCH
4011 unsigned long jumpIsland = 0;
4012 long offsetToJumpIsland = 0xBADBAD42; // initialise to bad value
4013 // to avoid warning and to catch
4017 unsigned long* wordPtr = (unsigned long*) (image + sect->offset + reloc->r_address);
4018 checkProddableBlock(oc,wordPtr);
4020 if(reloc->r_type == GENERIC_RELOC_VANILLA)
4024 #ifdef powerpc_HOST_ARCH
4025 else if(reloc->r_type == PPC_RELOC_LO16)
4027 word = ((unsigned short*) wordPtr)[1];
4028 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
4030 else if(reloc->r_type == PPC_RELOC_HI16)
4032 word = ((unsigned short*) wordPtr)[1] << 16;
4033 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF);
4035 else if(reloc->r_type == PPC_RELOC_HA16)
4037 word = ((unsigned short*) wordPtr)[1] << 16;
4038 word += ((short)relocs[i+1].r_address & (short)0xFFFF);
4040 else if(reloc->r_type == PPC_RELOC_BR24)
4043 word = (word & 0x03FFFFFC) | ((word & 0x02000000) ? 0xFC000000 : 0);
4047 if(!reloc->r_extern)
4050 sections[reloc->r_symbolnum-1].offset
4051 - sections[reloc->r_symbolnum-1].addr
4058 struct nlist *symbol = &nlist[reloc->r_symbolnum];
4059 char *nm = image + symLC->stroff + symbol->n_un.n_strx;
4060 void *symbolAddress = lookupSymbol(nm);
4063 errorBelch("\nunknown symbol `%s'", nm);
4069 #ifdef powerpc_HOST_ARCH
4070 // In the .o file, this should be a relative jump to NULL
4071 // and we'll change it to a relative jump to the symbol
4072 ASSERT(-word == reloc->r_address);
4073 jumpIsland = makeJumpIsland(oc,reloc->r_symbolnum,(unsigned long) symbolAddress);
4076 offsetToJumpIsland = word + jumpIsland
4077 - (((long)image) + sect->offset - sect->addr);
4080 word += (unsigned long) symbolAddress
4081 - (((long)image) + sect->offset - sect->addr);
4085 word += (unsigned long) symbolAddress;
4089 if(reloc->r_type == GENERIC_RELOC_VANILLA)
4094 #ifdef powerpc_HOST_ARCH
4095 else if(reloc->r_type == PPC_RELOC_LO16)
4097 ((unsigned short*) wordPtr)[1] = word & 0xFFFF;
4100 else if(reloc->r_type == PPC_RELOC_HI16)
4102 ((unsigned short*) wordPtr)[1] = (word >> 16) & 0xFFFF;
4105 else if(reloc->r_type == PPC_RELOC_HA16)
4107 ((unsigned short*) wordPtr)[1] = ((word >> 16) & 0xFFFF)
4108 + ((word & (1<<15)) ? 1 : 0);
4111 else if(reloc->r_type == PPC_RELOC_BR24)
4113 if((long)word > (long)0x01FFFFFF || (long)word < (long)0xFFE00000)
4115 // The branch offset is too large.
4116 // Therefore, we try to use a jump island.
4119 barf("unconditional relative branch out of range: "
4120 "no jump island available");
4123 word = offsetToJumpIsland;
4124 if((long)word > (long)0x01FFFFFF || (long)word < (long)0xFFE00000)
4125 barf("unconditional relative branch out of range: "
4126 "jump island out of range");
4128 *wordPtr = (*wordPtr & 0xFC000003) | (word & 0x03FFFFFC);
4133 barf("\nunknown relocation %d",reloc->r_type);
4140 static int ocGetNames_MachO(ObjectCode* oc)
4142 char *image = (char*) oc->image;
4143 struct mach_header *header = (struct mach_header*) image;
4144 struct load_command *lc = (struct load_command*) (image + sizeof(struct mach_header));
4145 unsigned i,curSymbol = 0;
4146 struct segment_command *segLC = NULL;
4147 struct section *sections;
4148 struct symtab_command *symLC = NULL;
4149 struct nlist *nlist;
4150 unsigned long commonSize = 0;
4151 char *commonStorage = NULL;
4152 unsigned long commonCounter;
4154 for(i=0;i<header->ncmds;i++)
4156 if(lc->cmd == LC_SEGMENT)
4157 segLC = (struct segment_command*) lc;
4158 else if(lc->cmd == LC_SYMTAB)
4159 symLC = (struct symtab_command*) lc;
4160 lc = (struct load_command *) ( ((char*)lc) + lc->cmdsize );
4163 sections = (struct section*) (segLC+1);
4164 nlist = symLC ? (struct nlist*) (image + symLC->symoff)
4167 for(i=0;i<segLC->nsects;i++)
4169 if(sections[i].size == 0)
4172 if((sections[i].flags & SECTION_TYPE) == S_ZEROFILL)
4174 char * zeroFillArea = stgCallocBytes(1,sections[i].size,
4175 "ocGetNames_MachO(common symbols)");
4176 sections[i].offset = zeroFillArea - image;
4179 if(!strcmp(sections[i].sectname,"__text"))
4180 addSection(oc, SECTIONKIND_CODE_OR_RODATA,
4181 (void*) (image + sections[i].offset),
4182 (void*) (image + sections[i].offset + sections[i].size));
4183 else if(!strcmp(sections[i].sectname,"__const"))
4184 addSection(oc, SECTIONKIND_RWDATA,
4185 (void*) (image + sections[i].offset),
4186 (void*) (image + sections[i].offset + sections[i].size));
4187 else if(!strcmp(sections[i].sectname,"__data"))
4188 addSection(oc, SECTIONKIND_RWDATA,
4189 (void*) (image + sections[i].offset),
4190 (void*) (image + sections[i].offset + sections[i].size));
4191 else if(!strcmp(sections[i].sectname,"__bss")
4192 || !strcmp(sections[i].sectname,"__common"))
4193 addSection(oc, SECTIONKIND_RWDATA,
4194 (void*) (image + sections[i].offset),
4195 (void*) (image + sections[i].offset + sections[i].size));
4197 addProddableBlock(oc, (void*) (image + sections[i].offset),
4201 // count external symbols defined here
4205 for(i=0;i<symLC->nsyms;i++)
4207 if(nlist[i].n_type & N_STAB)
4209 else if(nlist[i].n_type & N_EXT)
4211 if((nlist[i].n_type & N_TYPE) == N_UNDF
4212 && (nlist[i].n_value != 0))
4214 commonSize += nlist[i].n_value;
4217 else if((nlist[i].n_type & N_TYPE) == N_SECT)
4222 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
4223 "ocGetNames_MachO(oc->symbols)");
4227 for(i=0;i<symLC->nsyms;i++)
4229 if(nlist[i].n_type & N_STAB)
4231 else if((nlist[i].n_type & N_TYPE) == N_SECT)
4233 if(nlist[i].n_type & N_EXT)
4235 char *nm = image + symLC->stroff + nlist[i].n_un.n_strx;
4236 ghciInsertStrHashTable(oc->fileName, symhash, nm,
4238 + sections[nlist[i].n_sect-1].offset
4239 - sections[nlist[i].n_sect-1].addr
4240 + nlist[i].n_value);
4241 oc->symbols[curSymbol++] = nm;
4245 char *nm = image + symLC->stroff + nlist[i].n_un.n_strx;
4246 ghciInsertStrHashTable(oc->fileName, oc->lochash, nm,
4248 + sections[nlist[i].n_sect-1].offset
4249 - sections[nlist[i].n_sect-1].addr
4250 + nlist[i].n_value);
4256 commonStorage = stgCallocBytes(1,commonSize,"ocGetNames_MachO(common symbols)");
4257 commonCounter = (unsigned long)commonStorage;
4260 for(i=0;i<symLC->nsyms;i++)
4262 if((nlist[i].n_type & N_TYPE) == N_UNDF
4263 && (nlist[i].n_type & N_EXT) && (nlist[i].n_value != 0))
4265 char *nm = image + symLC->stroff + nlist[i].n_un.n_strx;
4266 unsigned long sz = nlist[i].n_value;
4268 nlist[i].n_value = commonCounter;
4270 ghciInsertStrHashTable(oc->fileName, symhash, nm,
4271 (void*)commonCounter);
4272 oc->symbols[curSymbol++] = nm;
4274 commonCounter += sz;
4281 static int ocResolve_MachO(ObjectCode* oc)
4283 char *image = (char*) oc->image;
4284 struct mach_header *header = (struct mach_header*) image;
4285 struct load_command *lc = (struct load_command*) (image + sizeof(struct mach_header));
4287 struct segment_command *segLC = NULL;
4288 struct section *sections;
4289 struct symtab_command *symLC = NULL;
4290 struct dysymtab_command *dsymLC = NULL;
4291 struct nlist *nlist;
4293 for(i=0;i<header->ncmds;i++)
4295 if(lc->cmd == LC_SEGMENT)
4296 segLC = (struct segment_command*) lc;
4297 else if(lc->cmd == LC_SYMTAB)
4298 symLC = (struct symtab_command*) lc;
4299 else if(lc->cmd == LC_DYSYMTAB)
4300 dsymLC = (struct dysymtab_command*) lc;
4301 lc = (struct load_command *) ( ((char*)lc) + lc->cmdsize );
4304 sections = (struct section*) (segLC+1);
4305 nlist = symLC ? (struct nlist*) (image + symLC->symoff)
4310 unsigned long *indirectSyms
4311 = (unsigned long*) (image + dsymLC->indirectsymoff);
4313 for(i=0;i<segLC->nsects;i++)
4315 if( !strcmp(sections[i].sectname,"__la_symbol_ptr")
4316 || !strcmp(sections[i].sectname,"__la_sym_ptr2")
4317 || !strcmp(sections[i].sectname,"__la_sym_ptr3"))
4319 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4322 else if(!strcmp(sections[i].sectname,"__nl_symbol_ptr")
4323 || !strcmp(sections[i].sectname,"__pointers"))
4325 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4328 else if(!strcmp(sections[i].sectname,"__jump_table"))
4330 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4336 for(i=0;i<segLC->nsects;i++)
4338 if(!relocateSection(oc,image,symLC,nlist,segLC->nsects,sections,§ions[i]))
4342 /* Free the local symbol table; we won't need it again. */
4343 freeHashTable(oc->lochash, NULL);
4346 #if defined (powerpc_HOST_ARCH)
4347 ocFlushInstructionCache( oc );
4353 #ifdef powerpc_HOST_ARCH
4355 * The Mach-O object format uses leading underscores. But not everywhere.
4356 * There is a small number of runtime support functions defined in
4357 * libcc_dynamic.a whose name does not have a leading underscore.
4358 * As a consequence, we can't get their address from C code.
4359 * We have to use inline assembler just to take the address of a function.
4363 static void machoInitSymbolsWithoutUnderscore()
4365 extern void* symbolsWithoutUnderscore[];
4366 void **p = symbolsWithoutUnderscore;
4367 __asm__ volatile(".globl _symbolsWithoutUnderscore\n.data\n_symbolsWithoutUnderscore:");
4371 __asm__ volatile(".long " # x);
4373 RTS_MACHO_NOUNDERLINE_SYMBOLS
4375 __asm__ volatile(".text");
4379 ghciInsertStrHashTable("(GHCi built-in symbols)", symhash, #x, *p++);
4381 RTS_MACHO_NOUNDERLINE_SYMBOLS
4388 * Figure out by how much to shift the entire Mach-O file in memory
4389 * when loading so that its single segment ends up 16-byte-aligned
4391 static int machoGetMisalignment( FILE * f )
4393 struct mach_header header;
4396 fread(&header, sizeof(header), 1, f);
4399 if(header.magic != MH_MAGIC)
4402 misalignment = (header.sizeofcmds + sizeof(header))
4405 return misalignment ? (16 - misalignment) : 0;
4410 #if defined(GHCI) && defined(BREAKPOINT)
4411 int isSuffixOf(char* x, char* suffix) {
4412 int suffix_len = strlen (suffix);
4413 int x_len = strlen (x);
4417 if (suffix_len > x_len)
4419 if (suffix_len == 0)
4422 char* x_suffix = &x[strlen(x)-strlen(suffix)];
4423 return strcmp(x_suffix, suffix) == 0;