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>
90 #if defined(x86_64_HOST_ARCH)
91 # include <mach-o/x86_64/reloc.h>
95 /* Hash table mapping symbol names to Symbol */
96 static /*Str*/HashTable *symhash;
98 /* Hash table mapping symbol names to StgStablePtr */
99 static /*Str*/HashTable *stablehash;
101 /* List of currently loaded objects */
102 ObjectCode *objects = NULL; /* initially empty */
104 #if defined(OBJFORMAT_ELF)
105 static int ocVerifyImage_ELF ( ObjectCode* oc );
106 static int ocGetNames_ELF ( ObjectCode* oc );
107 static int ocResolve_ELF ( ObjectCode* oc );
108 #if defined(powerpc_HOST_ARCH)
109 static int ocAllocateSymbolExtras_ELF ( ObjectCode* oc );
111 #elif defined(OBJFORMAT_PEi386)
112 static int ocVerifyImage_PEi386 ( ObjectCode* oc );
113 static int ocGetNames_PEi386 ( ObjectCode* oc );
114 static int ocResolve_PEi386 ( ObjectCode* oc );
115 #elif defined(OBJFORMAT_MACHO)
116 static int ocVerifyImage_MachO ( ObjectCode* oc );
117 static int ocGetNames_MachO ( ObjectCode* oc );
118 static int ocResolve_MachO ( ObjectCode* oc );
120 static int machoGetMisalignment( FILE * );
121 #if defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH)
122 static int ocAllocateSymbolExtras_MachO ( ObjectCode* oc );
124 #ifdef powerpc_HOST_ARCH
125 static void machoInitSymbolsWithoutUnderscore( void );
129 #if defined(x86_64_HOST_ARCH) && defined(OBJFORMAT_ELF)
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 #if HAVE_GETTIMEOFDAY
260 #define RTS_MINGW_GETTIMEOFDAY_SYM Sym(gettimeofday)
262 #define RTS_MINGW_GETTIMEOFDAY_SYM /**/
265 /* These are statically linked from the mingw libraries into the ghc
266 executable, so we have to employ this hack. */
267 #define RTS_MINGW_ONLY_SYMBOLS \
268 SymX(asyncReadzh_fast) \
269 SymX(asyncWritezh_fast) \
270 SymX(asyncDoProczh_fast) \
282 SymX(getservbyname) \
283 SymX(getservbyport) \
284 SymX(getprotobynumber) \
285 SymX(getprotobyname) \
286 SymX(gethostbyname) \
287 SymX(gethostbyaddr) \
334 SymX(rts_InstallConsoleEvent) \
335 SymX(rts_ConsoleHandlerDone) \
337 Sym(_imp___timezone) \
347 RTS_MINGW_EXTRA_SYMS \
348 RTS_MINGW_GETTIMEOFDAY_SYM \
352 #if defined(darwin_TARGET_OS) && HAVE_PRINTF_LDBLSTUB
353 #define RTS_DARWIN_ONLY_SYMBOLS \
354 Sym(asprintf$LDBLStub) \
358 Sym(fprintf$LDBLStub) \
359 Sym(fscanf$LDBLStub) \
360 Sym(fwprintf$LDBLStub) \
361 Sym(fwscanf$LDBLStub) \
362 Sym(printf$LDBLStub) \
363 Sym(scanf$LDBLStub) \
364 Sym(snprintf$LDBLStub) \
365 Sym(sprintf$LDBLStub) \
366 Sym(sscanf$LDBLStub) \
367 Sym(strtold$LDBLStub) \
368 Sym(swprintf$LDBLStub) \
369 Sym(swscanf$LDBLStub) \
370 Sym(syslog$LDBLStub) \
371 Sym(vasprintf$LDBLStub) \
373 Sym(verrc$LDBLStub) \
374 Sym(verrx$LDBLStub) \
375 Sym(vfprintf$LDBLStub) \
376 Sym(vfscanf$LDBLStub) \
377 Sym(vfwprintf$LDBLStub) \
378 Sym(vfwscanf$LDBLStub) \
379 Sym(vprintf$LDBLStub) \
380 Sym(vscanf$LDBLStub) \
381 Sym(vsnprintf$LDBLStub) \
382 Sym(vsprintf$LDBLStub) \
383 Sym(vsscanf$LDBLStub) \
384 Sym(vswprintf$LDBLStub) \
385 Sym(vswscanf$LDBLStub) \
386 Sym(vsyslog$LDBLStub) \
387 Sym(vwarn$LDBLStub) \
388 Sym(vwarnc$LDBLStub) \
389 Sym(vwarnx$LDBLStub) \
390 Sym(vwprintf$LDBLStub) \
391 Sym(vwscanf$LDBLStub) \
393 Sym(warnc$LDBLStub) \
394 Sym(warnx$LDBLStub) \
395 Sym(wcstold$LDBLStub) \
396 Sym(wprintf$LDBLStub) \
399 #define RTS_DARWIN_ONLY_SYMBOLS
403 # define MAIN_CAP_SYM SymX(MainCapability)
405 # define MAIN_CAP_SYM
408 #if !defined(mingw32_HOST_OS)
409 #define RTS_USER_SIGNALS_SYMBOLS \
410 SymX(setIOManagerPipe)
412 #define RTS_USER_SIGNALS_SYMBOLS \
413 SymX(sendIOManagerEvent) \
414 SymX(readIOManagerEvent) \
415 SymX(getIOManagerEvent) \
416 SymX(console_handler)
419 #ifdef TABLES_NEXT_TO_CODE
420 #define RTS_RET_SYMBOLS /* nothing */
422 #define RTS_RET_SYMBOLS \
423 SymX(stg_enter_ret) \
424 SymX(stg_gc_fun_ret) \
431 SymX(stg_ap_pv_ret) \
432 SymX(stg_ap_pp_ret) \
433 SymX(stg_ap_ppv_ret) \
434 SymX(stg_ap_ppp_ret) \
435 SymX(stg_ap_pppv_ret) \
436 SymX(stg_ap_pppp_ret) \
437 SymX(stg_ap_ppppp_ret) \
438 SymX(stg_ap_pppppp_ret)
441 #define RTS_SYMBOLS \
444 SymX(stg_enter_info) \
445 SymX(stg_gc_void_info) \
446 SymX(__stg_gc_enter_1) \
447 SymX(stg_gc_noregs) \
448 SymX(stg_gc_unpt_r1_info) \
449 SymX(stg_gc_unpt_r1) \
450 SymX(stg_gc_unbx_r1_info) \
451 SymX(stg_gc_unbx_r1) \
452 SymX(stg_gc_f1_info) \
454 SymX(stg_gc_d1_info) \
456 SymX(stg_gc_l1_info) \
459 SymX(stg_gc_fun_info) \
461 SymX(stg_gc_gen_info) \
462 SymX(stg_gc_gen_hp) \
464 SymX(stg_gen_yield) \
465 SymX(stg_yield_noregs) \
466 SymX(stg_yield_to_interpreter) \
467 SymX(stg_gen_block) \
468 SymX(stg_block_noregs) \
470 SymX(stg_block_takemvar) \
471 SymX(stg_block_putmvar) \
473 SymX(MallocFailHook) \
475 SymX(OutOfHeapHook) \
476 SymX(StackOverflowHook) \
477 SymX(__encodeDouble) \
478 SymX(__encodeFloat) \
482 SymX(__gmpz_cmp_si) \
483 SymX(__gmpz_cmp_ui) \
484 SymX(__gmpz_get_si) \
485 SymX(__gmpz_get_ui) \
486 SymX(__int_encodeDouble) \
487 SymX(__int_encodeFloat) \
488 SymX(andIntegerzh_fast) \
489 SymX(atomicallyzh_fast) \
493 SymX(blockAsyncExceptionszh_fast) \
495 SymX(catchRetryzh_fast) \
496 SymX(catchSTMzh_fast) \
498 SymX(closure_flags) \
500 SymX(cmpIntegerzh_fast) \
501 SymX(cmpIntegerIntzh_fast) \
502 SymX(complementIntegerzh_fast) \
503 SymX(createAdjustor) \
504 SymX(decodeDoublezh_fast) \
505 SymX(decodeFloatzh_fast) \
508 SymX(deRefWeakzh_fast) \
509 SymX(deRefStablePtrzh_fast) \
510 SymX(dirty_MUT_VAR) \
511 SymX(divExactIntegerzh_fast) \
512 SymX(divModIntegerzh_fast) \
514 SymX(forkOnzh_fast) \
516 SymX(forkOS_createThread) \
517 SymX(freeHaskellFunctionPtr) \
518 SymX(freeStablePtr) \
519 SymX(getOrSetTypeableStore) \
520 SymX(gcdIntegerzh_fast) \
521 SymX(gcdIntegerIntzh_fast) \
522 SymX(gcdIntzh_fast) \
526 SymX(getFullProgArgv) \
532 SymX(hs_perform_gc) \
533 SymX(hs_free_stable_ptr) \
534 SymX(hs_free_fun_ptr) \
536 SymX(unpackClosurezh_fast) \
537 SymX(getApStackValzh_fast) \
538 SymX(int2Integerzh_fast) \
539 SymX(integer2Intzh_fast) \
540 SymX(integer2Wordzh_fast) \
541 SymX(isCurrentThreadBoundzh_fast) \
542 SymX(isDoubleDenormalized) \
543 SymX(isDoubleInfinite) \
545 SymX(isDoubleNegativeZero) \
546 SymX(isEmptyMVarzh_fast) \
547 SymX(isFloatDenormalized) \
548 SymX(isFloatInfinite) \
550 SymX(isFloatNegativeZero) \
551 SymX(killThreadzh_fast) \
553 SymX(insertStableSymbol) \
556 SymX(makeStablePtrzh_fast) \
557 SymX(minusIntegerzh_fast) \
558 SymX(mkApUpd0zh_fast) \
559 SymX(myThreadIdzh_fast) \
560 SymX(labelThreadzh_fast) \
561 SymX(newArrayzh_fast) \
562 SymX(newBCOzh_fast) \
563 SymX(newByteArrayzh_fast) \
564 SymX_redirect(newCAF, newDynCAF) \
565 SymX(newMVarzh_fast) \
566 SymX(newMutVarzh_fast) \
567 SymX(newTVarzh_fast) \
568 SymX(noDuplicatezh_fast) \
569 SymX(atomicModifyMutVarzh_fast) \
570 SymX(newPinnedByteArrayzh_fast) \
572 SymX(orIntegerzh_fast) \
574 SymX(performMajorGC) \
575 SymX(plusIntegerzh_fast) \
578 SymX(putMVarzh_fast) \
579 SymX(quotIntegerzh_fast) \
580 SymX(quotRemIntegerzh_fast) \
582 SymX(raiseIOzh_fast) \
583 SymX(readTVarzh_fast) \
584 SymX(remIntegerzh_fast) \
585 SymX(resetNonBlockingFd) \
590 SymX(rts_checkSchedStatus) \
593 SymX(rts_evalLazyIO) \
594 SymX(rts_evalStableIO) \
598 SymX(rts_getDouble) \
603 SymX(rts_getFunPtr) \
604 SymX(rts_getStablePtr) \
605 SymX(rts_getThreadId) \
607 SymX(rts_getWord32) \
620 SymX(rts_mkStablePtr) \
628 SymX(rtsSupportsBoundThreads) \
629 SymX(__hscore_get_saved_termios) \
630 SymX(__hscore_set_saved_termios) \
632 SymX(startupHaskell) \
633 SymX(shutdownHaskell) \
634 SymX(shutdownHaskellAndExit) \
635 SymX(stable_ptr_table) \
636 SymX(stackOverflow) \
637 SymX(stg_CAF_BLACKHOLE_info) \
638 SymX(awakenBlockedQueue) \
639 SymX(stg_CHARLIKE_closure) \
640 SymX(stg_EMPTY_MVAR_info) \
641 SymX(stg_IND_STATIC_info) \
642 SymX(stg_INTLIKE_closure) \
643 SymX(stg_MUT_ARR_PTRS_DIRTY_info) \
644 SymX(stg_MUT_ARR_PTRS_FROZEN_info) \
645 SymX(stg_MUT_ARR_PTRS_FROZEN0_info) \
646 SymX(stg_WEAK_info) \
647 SymX(stg_ap_v_info) \
648 SymX(stg_ap_f_info) \
649 SymX(stg_ap_d_info) \
650 SymX(stg_ap_l_info) \
651 SymX(stg_ap_n_info) \
652 SymX(stg_ap_p_info) \
653 SymX(stg_ap_pv_info) \
654 SymX(stg_ap_pp_info) \
655 SymX(stg_ap_ppv_info) \
656 SymX(stg_ap_ppp_info) \
657 SymX(stg_ap_pppv_info) \
658 SymX(stg_ap_pppp_info) \
659 SymX(stg_ap_ppppp_info) \
660 SymX(stg_ap_pppppp_info) \
661 SymX(stg_ap_0_fast) \
662 SymX(stg_ap_v_fast) \
663 SymX(stg_ap_f_fast) \
664 SymX(stg_ap_d_fast) \
665 SymX(stg_ap_l_fast) \
666 SymX(stg_ap_n_fast) \
667 SymX(stg_ap_p_fast) \
668 SymX(stg_ap_pv_fast) \
669 SymX(stg_ap_pp_fast) \
670 SymX(stg_ap_ppv_fast) \
671 SymX(stg_ap_ppp_fast) \
672 SymX(stg_ap_pppv_fast) \
673 SymX(stg_ap_pppp_fast) \
674 SymX(stg_ap_ppppp_fast) \
675 SymX(stg_ap_pppppp_fast) \
676 SymX(stg_ap_1_upd_info) \
677 SymX(stg_ap_2_upd_info) \
678 SymX(stg_ap_3_upd_info) \
679 SymX(stg_ap_4_upd_info) \
680 SymX(stg_ap_5_upd_info) \
681 SymX(stg_ap_6_upd_info) \
682 SymX(stg_ap_7_upd_info) \
684 SymX(stg_sel_0_upd_info) \
685 SymX(stg_sel_10_upd_info) \
686 SymX(stg_sel_11_upd_info) \
687 SymX(stg_sel_12_upd_info) \
688 SymX(stg_sel_13_upd_info) \
689 SymX(stg_sel_14_upd_info) \
690 SymX(stg_sel_15_upd_info) \
691 SymX(stg_sel_1_upd_info) \
692 SymX(stg_sel_2_upd_info) \
693 SymX(stg_sel_3_upd_info) \
694 SymX(stg_sel_4_upd_info) \
695 SymX(stg_sel_5_upd_info) \
696 SymX(stg_sel_6_upd_info) \
697 SymX(stg_sel_7_upd_info) \
698 SymX(stg_sel_8_upd_info) \
699 SymX(stg_sel_9_upd_info) \
700 SymX(stg_upd_frame_info) \
701 SymX(suspendThread) \
702 SymX(takeMVarzh_fast) \
703 SymX(timesIntegerzh_fast) \
704 SymX(tryPutMVarzh_fast) \
705 SymX(tryTakeMVarzh_fast) \
706 SymX(unblockAsyncExceptionszh_fast) \
708 SymX(unsafeThawArrayzh_fast) \
709 SymX(waitReadzh_fast) \
710 SymX(waitWritezh_fast) \
711 SymX(word2Integerzh_fast) \
712 SymX(writeTVarzh_fast) \
713 SymX(xorIntegerzh_fast) \
715 SymX(stg_interp_constr_entry) \
718 SymX(getAllocations) \
721 SymX(rts_breakpoint_io_action) \
722 SymX(rts_stop_next_breakpoint) \
723 SymX(rts_stop_on_exception) \
724 RTS_USER_SIGNALS_SYMBOLS
726 #ifdef SUPPORT_LONG_LONGS
727 #define RTS_LONG_LONG_SYMS \
728 SymX(int64ToIntegerzh_fast) \
729 SymX(word64ToIntegerzh_fast)
731 #define RTS_LONG_LONG_SYMS /* nothing */
734 // 64-bit support functions in libgcc.a
735 #if defined(__GNUC__) && SIZEOF_VOID_P <= 4
736 #define RTS_LIBGCC_SYMBOLS \
746 #elif defined(ia64_HOST_ARCH)
747 #define RTS_LIBGCC_SYMBOLS \
755 #define RTS_LIBGCC_SYMBOLS
758 #if defined(darwin_HOST_OS) && defined(powerpc_HOST_ARCH)
759 // Symbols that don't have a leading underscore
760 // on Mac OS X. They have to receive special treatment,
761 // see machoInitSymbolsWithoutUnderscore()
762 #define RTS_MACHO_NOUNDERLINE_SYMBOLS \
767 /* entirely bogus claims about types of these symbols */
768 #define Sym(vvv) extern void vvv(void);
769 #define SymX(vvv) /**/
770 #define SymX_redirect(vvv,xxx) /**/
774 RTS_POSIX_ONLY_SYMBOLS
775 RTS_MINGW_ONLY_SYMBOLS
776 RTS_CYGWIN_ONLY_SYMBOLS
777 RTS_DARWIN_ONLY_SYMBOLS
783 #ifdef LEADING_UNDERSCORE
784 #define MAYBE_LEADING_UNDERSCORE_STR(s) ("_" s)
786 #define MAYBE_LEADING_UNDERSCORE_STR(s) (s)
789 #define Sym(vvv) { MAYBE_LEADING_UNDERSCORE_STR(#vvv), \
791 #define SymX(vvv) Sym(vvv)
793 // SymX_redirect allows us to redirect references to one symbol to
794 // another symbol. See newCAF/newDynCAF for an example.
795 #define SymX_redirect(vvv,xxx) \
796 { MAYBE_LEADING_UNDERSCORE_STR(#vvv), \
799 static RtsSymbolVal rtsSyms[] = {
803 RTS_POSIX_ONLY_SYMBOLS
804 RTS_MINGW_ONLY_SYMBOLS
805 RTS_CYGWIN_ONLY_SYMBOLS
806 RTS_DARWIN_ONLY_SYMBOLS
808 #if defined(darwin_HOST_OS) && defined(i386_HOST_ARCH)
809 // dyld stub code contains references to this,
810 // but it should never be called because we treat
811 // lazy pointers as nonlazy.
812 { "dyld_stub_binding_helper", (void*)0xDEADBEEF },
814 { 0, 0 } /* sentinel */
819 /* -----------------------------------------------------------------------------
820 * Insert symbols into hash tables, checking for duplicates.
823 static void ghciInsertStrHashTable ( char* obj_name,
829 if (lookupHashTable(table, (StgWord)key) == NULL)
831 insertStrHashTable(table, (StgWord)key, data);
836 "GHCi runtime linker: fatal error: I found a duplicate definition for symbol\n"
838 "whilst processing object file\n"
840 "This could be caused by:\n"
841 " * Loading two different object files which export the same symbol\n"
842 " * Specifying the same object file twice on the GHCi command line\n"
843 " * An incorrect `package.conf' entry, causing some object to be\n"
845 "GHCi cannot safely continue in this situation. Exiting now. Sorry.\n"
852 /* -----------------------------------------------------------------------------
853 * initialize the object linker
857 static int linker_init_done = 0 ;
859 #if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
860 static void *dl_prog_handle;
868 /* Make initLinker idempotent, so we can call it
869 before evey relevant operation; that means we
870 don't need to initialise the linker separately */
871 if (linker_init_done == 1) { return; } else {
872 linker_init_done = 1;
875 stablehash = allocStrHashTable();
876 symhash = allocStrHashTable();
878 /* populate the symbol table with stuff from the RTS */
879 for (sym = rtsSyms; sym->lbl != NULL; sym++) {
880 ghciInsertStrHashTable("(GHCi built-in symbols)",
881 symhash, sym->lbl, sym->addr);
883 # if defined(OBJFORMAT_MACHO) && defined(powerpc_HOST_ARCH)
884 machoInitSymbolsWithoutUnderscore();
887 # if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
888 # if defined(RTLD_DEFAULT)
889 dl_prog_handle = RTLD_DEFAULT;
891 dl_prog_handle = dlopen(NULL, RTLD_LAZY);
892 # endif /* RTLD_DEFAULT */
896 /* -----------------------------------------------------------------------------
897 * Loading DLL or .so dynamic libraries
898 * -----------------------------------------------------------------------------
900 * Add a DLL from which symbols may be found. In the ELF case, just
901 * do RTLD_GLOBAL-style add, so no further messing around needs to
902 * happen in order that symbols in the loaded .so are findable --
903 * lookupSymbol() will subsequently see them by dlsym on the program's
904 * dl-handle. Returns NULL if success, otherwise ptr to an err msg.
906 * In the PEi386 case, open the DLLs and put handles to them in a
907 * linked list. When looking for a symbol, try all handles in the
908 * list. This means that we need to load even DLLs that are guaranteed
909 * to be in the ghc.exe image already, just so we can get a handle
910 * to give to loadSymbol, so that we can find the symbols. For such
911 * libraries, the LoadLibrary call should be a no-op except for returning
916 #if defined(OBJFORMAT_PEi386)
917 /* A record for storing handles into DLLs. */
922 struct _OpenedDLL* next;
927 /* A list thereof. */
928 static OpenedDLL* opened_dlls = NULL;
932 addDLL( char *dll_name )
934 # if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
935 /* ------------------- ELF DLL loader ------------------- */
941 hdl= dlopen(dll_name, RTLD_NOW | RTLD_GLOBAL);
944 /* dlopen failed; return a ptr to the error msg. */
946 if (errmsg == NULL) errmsg = "addDLL: unknown error";
953 # elif defined(OBJFORMAT_PEi386)
954 /* ------------------- Win32 DLL loader ------------------- */
962 /* debugBelch("\naddDLL; dll_name = `%s'\n", dll_name); */
964 /* See if we've already got it, and ignore if so. */
965 for (o_dll = opened_dlls; o_dll != NULL; o_dll = o_dll->next) {
966 if (0 == strcmp(o_dll->name, dll_name))
970 /* The file name has no suffix (yet) so that we can try
971 both foo.dll and foo.drv
973 The documentation for LoadLibrary says:
974 If no file name extension is specified in the lpFileName
975 parameter, the default library extension .dll is
976 appended. However, the file name string can include a trailing
977 point character (.) to indicate that the module name has no
980 buf = stgMallocBytes(strlen(dll_name) + 10, "addDLL");
981 sprintf(buf, "%s.DLL", dll_name);
982 instance = LoadLibrary(buf);
983 if (instance == NULL) {
984 sprintf(buf, "%s.DRV", dll_name); // KAA: allow loading of drivers (like winspool.drv)
985 instance = LoadLibrary(buf);
986 if (instance == NULL) {
989 /* LoadLibrary failed; return a ptr to the error msg. */
990 return "addDLL: unknown error";
995 /* Add this DLL to the list of DLLs in which to search for symbols. */
996 o_dll = stgMallocBytes( sizeof(OpenedDLL), "addDLL" );
997 o_dll->name = stgMallocBytes(1+strlen(dll_name), "addDLL");
998 strcpy(o_dll->name, dll_name);
999 o_dll->instance = instance;
1000 o_dll->next = opened_dlls;
1001 opened_dlls = o_dll;
1005 barf("addDLL: not implemented on this platform");
1009 /* -----------------------------------------------------------------------------
1010 * insert a stable symbol in the hash table
1014 insertStableSymbol(char* obj_name, char* key, StgPtr p)
1016 ghciInsertStrHashTable(obj_name, stablehash, key, getStablePtr(p));
1020 /* -----------------------------------------------------------------------------
1021 * insert a symbol in the hash table
1024 insertSymbol(char* obj_name, char* key, void* data)
1026 ghciInsertStrHashTable(obj_name, symhash, key, data);
1029 /* -----------------------------------------------------------------------------
1030 * lookup a symbol in the hash table
1033 lookupSymbol( char *lbl )
1037 ASSERT(symhash != NULL);
1038 val = lookupStrHashTable(symhash, lbl);
1041 # if defined(OBJFORMAT_ELF)
1042 # if defined(x86_64_HOST_ARCH)
1043 val = dlsym(dl_prog_handle, lbl);
1044 if (val >= (void *)0x80000000) {
1046 new_val = x86_64_high_symbol(lbl, val);
1047 IF_DEBUG(linker,debugBelch("lookupSymbol: relocating out of range symbol: %s = %p, now %p\n", lbl, val, new_val));
1053 return dlsym(dl_prog_handle, lbl);
1055 # elif defined(OBJFORMAT_MACHO)
1056 if(NSIsSymbolNameDefined(lbl)) {
1057 NSSymbol symbol = NSLookupAndBindSymbol(lbl);
1058 return NSAddressOfSymbol(symbol);
1062 # elif defined(OBJFORMAT_PEi386)
1065 for (o_dll = opened_dlls; o_dll != NULL; o_dll = o_dll->next) {
1066 /* debugBelch("look in %s for %s\n", o_dll->name, lbl); */
1067 if (lbl[0] == '_') {
1068 /* HACK: if the name has an initial underscore, try stripping
1069 it off & look that up first. I've yet to verify whether there's
1070 a Rule that governs whether an initial '_' *should always* be
1071 stripped off when mapping from import lib name to the DLL name.
1073 sym = GetProcAddress(o_dll->instance, (lbl+1));
1075 /*debugBelch("found %s in %s\n", lbl+1,o_dll->name);*/
1079 sym = GetProcAddress(o_dll->instance, lbl);
1081 /*debugBelch("found %s in %s\n", lbl,o_dll->name);*/
1096 __attribute((unused))
1098 lookupLocalSymbol( ObjectCode* oc, char *lbl )
1102 val = lookupStrHashTable(oc->lochash, lbl);
1112 /* -----------------------------------------------------------------------------
1113 * Debugging aid: look in GHCi's object symbol tables for symbols
1114 * within DELTA bytes of the specified address, and show their names.
1117 void ghci_enquire ( char* addr );
1119 void ghci_enquire ( char* addr )
1124 const int DELTA = 64;
1129 for (oc = objects; oc; oc = oc->next) {
1130 for (i = 0; i < oc->n_symbols; i++) {
1131 sym = oc->symbols[i];
1132 if (sym == NULL) continue;
1133 // debugBelch("enquire %p %p\n", sym, oc->lochash);
1135 if (oc->lochash != NULL) {
1136 a = lookupStrHashTable(oc->lochash, sym);
1139 a = lookupStrHashTable(symhash, sym);
1142 // debugBelch("ghci_enquire: can't find %s\n", sym);
1144 else if (addr-DELTA <= a && a <= addr+DELTA) {
1145 debugBelch("%p + %3d == `%s'\n", addr, (int)(a - addr), sym);
1152 #ifdef ia64_HOST_ARCH
1153 static unsigned int PLTSize(void);
1156 /* -----------------------------------------------------------------------------
1157 * Load an obj (populate the global symbol table, but don't resolve yet)
1159 * Returns: 1 if ok, 0 on error.
1162 loadObj( char *path )
1169 void *map_addr = NULL;
1175 /* debugBelch("loadObj %s\n", path ); */
1177 /* Check that we haven't already loaded this object.
1178 Ignore requests to load multiple times */
1182 for (o = objects; o; o = o->next) {
1183 if (0 == strcmp(o->fileName, path)) {
1185 break; /* don't need to search further */
1189 IF_DEBUG(linker, debugBelch(
1190 "GHCi runtime linker: warning: looks like you're trying to load the\n"
1191 "same object file twice:\n"
1193 "GHCi will ignore this, but be warned.\n"
1195 return 1; /* success */
1199 oc = stgMallocBytes(sizeof(ObjectCode), "loadObj(oc)");
1201 # if defined(OBJFORMAT_ELF)
1202 oc->formatName = "ELF";
1203 # elif defined(OBJFORMAT_PEi386)
1204 oc->formatName = "PEi386";
1205 # elif defined(OBJFORMAT_MACHO)
1206 oc->formatName = "Mach-O";
1209 barf("loadObj: not implemented on this platform");
1212 r = stat(path, &st);
1213 if (r == -1) { return 0; }
1215 /* sigh, strdup() isn't a POSIX function, so do it the long way */
1216 oc->fileName = stgMallocBytes( strlen(path)+1, "loadObj" );
1217 strcpy(oc->fileName, path);
1219 oc->fileSize = st.st_size;
1221 oc->sections = NULL;
1222 oc->lochash = allocStrHashTable();
1223 oc->proddables = NULL;
1225 /* chain it onto the list of objects */
1230 #define ROUND_UP(x,size) ((x + size - 1) & ~(size - 1))
1232 /* On many architectures malloc'd memory isn't executable, so we need to use mmap. */
1234 #if defined(openbsd_HOST_OS)
1235 fd = open(path, O_RDONLY, S_IRUSR);
1237 fd = open(path, O_RDONLY);
1240 barf("loadObj: can't open `%s'", path);
1242 pagesize = getpagesize();
1244 #ifdef ia64_HOST_ARCH
1245 /* The PLT needs to be right before the object */
1246 n = ROUND_UP(PLTSize(), pagesize);
1247 oc->plt = mmap(NULL, n, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
1248 if (oc->plt == MAP_FAILED)
1249 barf("loadObj: can't allocate PLT");
1252 map_addr = oc->plt + n;
1255 n = ROUND_UP(oc->fileSize, pagesize);
1257 /* Link objects into the lower 2Gb on x86_64. GHC assumes the
1258 * small memory model on this architecture (see gcc docs,
1261 #ifdef x86_64_HOST_ARCH
1262 #define EXTRA_MAP_FLAGS MAP_32BIT
1264 #define EXTRA_MAP_FLAGS 0
1267 oc->image = mmap(map_addr, n, PROT_EXEC|PROT_READ|PROT_WRITE,
1268 MAP_PRIVATE|EXTRA_MAP_FLAGS, fd, 0);
1269 if (oc->image == MAP_FAILED)
1270 barf("loadObj: can't map `%s'", path);
1274 #else /* !USE_MMAP */
1276 /* load the image into memory */
1277 f = fopen(path, "rb");
1279 barf("loadObj: can't read `%s'", path);
1281 # if defined(mingw32_HOST_OS)
1282 // TODO: We would like to use allocateExec here, but allocateExec
1283 // cannot currently allocate blocks large enough.
1284 oc->image = VirtualAlloc(NULL, oc->fileSize, MEM_RESERVE | MEM_COMMIT,
1285 PAGE_EXECUTE_READWRITE);
1286 # elif defined(darwin_HOST_OS)
1287 // In a Mach-O .o file, all sections can and will be misaligned
1288 // if the total size of the headers is not a multiple of the
1289 // desired alignment. This is fine for .o files that only serve
1290 // as input for the static linker, but it's not fine for us,
1291 // as SSE (used by gcc for floating point) and Altivec require
1292 // 16-byte alignment.
1293 // We calculate the correct alignment from the header before
1294 // reading the file, and then we misalign oc->image on purpose so
1295 // that the actual sections end up aligned again.
1296 oc->misalignment = machoGetMisalignment(f);
1297 oc->image = stgMallocBytes(oc->fileSize + oc->misalignment, "loadObj(image)");
1298 oc->image += oc->misalignment;
1300 oc->image = stgMallocBytes(oc->fileSize, "loadObj(image)");
1303 n = fread ( oc->image, 1, oc->fileSize, f );
1304 if (n != oc->fileSize)
1305 barf("loadObj: error whilst reading `%s'", path);
1308 #endif /* USE_MMAP */
1310 # if defined(OBJFORMAT_MACHO) && (defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH))
1311 r = ocAllocateSymbolExtras_MachO ( oc );
1312 if (!r) { return r; }
1313 # elif defined(OBJFORMAT_ELF) && defined(powerpc_HOST_ARCH)
1314 r = ocAllocateSymbolExtras_ELF ( oc );
1315 if (!r) { return r; }
1318 /* verify the in-memory image */
1319 # if defined(OBJFORMAT_ELF)
1320 r = ocVerifyImage_ELF ( oc );
1321 # elif defined(OBJFORMAT_PEi386)
1322 r = ocVerifyImage_PEi386 ( oc );
1323 # elif defined(OBJFORMAT_MACHO)
1324 r = ocVerifyImage_MachO ( oc );
1326 barf("loadObj: no verify method");
1328 if (!r) { return r; }
1330 /* build the symbol list for this image */
1331 # if defined(OBJFORMAT_ELF)
1332 r = ocGetNames_ELF ( oc );
1333 # elif defined(OBJFORMAT_PEi386)
1334 r = ocGetNames_PEi386 ( oc );
1335 # elif defined(OBJFORMAT_MACHO)
1336 r = ocGetNames_MachO ( oc );
1338 barf("loadObj: no getNames method");
1340 if (!r) { return r; }
1342 /* loaded, but not resolved yet */
1343 oc->status = OBJECT_LOADED;
1348 /* -----------------------------------------------------------------------------
1349 * resolve all the currently unlinked objects in memory
1351 * Returns: 1 if ok, 0 on error.
1361 for (oc = objects; oc; oc = oc->next) {
1362 if (oc->status != OBJECT_RESOLVED) {
1363 # if defined(OBJFORMAT_ELF)
1364 r = ocResolve_ELF ( oc );
1365 # elif defined(OBJFORMAT_PEi386)
1366 r = ocResolve_PEi386 ( oc );
1367 # elif defined(OBJFORMAT_MACHO)
1368 r = ocResolve_MachO ( oc );
1370 barf("resolveObjs: not implemented on this platform");
1372 if (!r) { return r; }
1373 oc->status = OBJECT_RESOLVED;
1379 /* -----------------------------------------------------------------------------
1380 * delete an object from the pool
1383 unloadObj( char *path )
1385 ObjectCode *oc, *prev;
1387 ASSERT(symhash != NULL);
1388 ASSERT(objects != NULL);
1393 for (oc = objects; oc; prev = oc, oc = oc->next) {
1394 if (!strcmp(oc->fileName,path)) {
1396 /* Remove all the mappings for the symbols within this
1401 for (i = 0; i < oc->n_symbols; i++) {
1402 if (oc->symbols[i] != NULL) {
1403 removeStrHashTable(symhash, oc->symbols[i], NULL);
1411 prev->next = oc->next;
1414 // We're going to leave this in place, in case there are
1415 // any pointers from the heap into it:
1416 // #ifdef mingw32_HOST_OS
1417 // VirtualFree(oc->image);
1419 // stgFree(oc->image);
1421 stgFree(oc->fileName);
1422 stgFree(oc->symbols);
1423 stgFree(oc->sections);
1424 /* The local hash table should have been freed at the end
1425 of the ocResolve_ call on it. */
1426 ASSERT(oc->lochash == NULL);
1432 errorBelch("unloadObj: can't find `%s' to unload", path);
1436 /* -----------------------------------------------------------------------------
1437 * Sanity checking. For each ObjectCode, maintain a list of address ranges
1438 * which may be prodded during relocation, and abort if we try and write
1439 * outside any of these.
1441 static void addProddableBlock ( ObjectCode* oc, void* start, int size )
1444 = stgMallocBytes(sizeof(ProddableBlock), "addProddableBlock");
1445 /* debugBelch("aPB %p %p %d\n", oc, start, size); */
1449 pb->next = oc->proddables;
1450 oc->proddables = pb;
1453 static void checkProddableBlock ( ObjectCode* oc, void* addr )
1456 for (pb = oc->proddables; pb != NULL; pb = pb->next) {
1457 char* s = (char*)(pb->start);
1458 char* e = s + pb->size - 1;
1459 char* a = (char*)addr;
1460 /* Assumes that the biggest fixup involves a 4-byte write. This
1461 probably needs to be changed to 8 (ie, +7) on 64-bit
1463 if (a >= s && (a+3) <= e) return;
1465 barf("checkProddableBlock: invalid fixup in runtime linker");
1468 /* -----------------------------------------------------------------------------
1469 * Section management.
1471 static void addSection ( ObjectCode* oc, SectionKind kind,
1472 void* start, void* end )
1474 Section* s = stgMallocBytes(sizeof(Section), "addSection");
1478 s->next = oc->sections;
1481 debugBelch("addSection: %p-%p (size %d), kind %d\n",
1482 start, ((char*)end)-1, end - start + 1, kind );
1487 /* --------------------------------------------------------------------------
1489 * This is about allocating a small chunk of memory for every symbol in the
1490 * object file. We make sure that the SymboLExtras are always "in range" of
1491 * limited-range PC-relative instructions on various platforms by allocating
1492 * them right next to the object code itself.
1495 #if defined(powerpc_HOST_ARCH) || (defined(x86_64_HOST_ARCH) \
1496 && defined(darwin_TARGET_OS))
1499 ocAllocateSymbolExtras
1501 Allocate additional space at the end of the object file image to make room
1502 for jump islands (powerpc, x86_64) and GOT entries (x86_64).
1504 PowerPC relative branch instructions have a 24 bit displacement field.
1505 As PPC code is always 4-byte-aligned, this yields a +-32MB range.
1506 If a particular imported symbol is outside this range, we have to redirect
1507 the jump to a short piece of new code that just loads the 32bit absolute
1508 address and jumps there.
1509 On x86_64, PC-relative jumps and PC-relative accesses to the GOT are limited
1512 This function just allocates space for one SymbolExtra for every
1513 undefined symbol in the object file. The code for the jump islands is
1514 filled in by makeSymbolExtra below.
1517 static int ocAllocateSymbolExtras( ObjectCode* oc, int count, int first )
1523 int misalignment = 0;
1525 misalignment = oc->misalignment;
1530 // round up to the nearest 4
1531 aligned = (oc->fileSize + 3) & ~3;
1534 #ifndef linux_HOST_OS /* mremap is a linux extension */
1535 #error ocAllocateSymbolExtras doesnt want USE_MMAP to be defined
1538 pagesize = getpagesize();
1539 n = ROUND_UP( oc->fileSize, pagesize );
1540 m = ROUND_UP( aligned + sizeof (SymbolExtra) * count, pagesize );
1542 /* If we have a half-page-size file and map one page of it then
1543 * the part of the page after the size of the file remains accessible.
1544 * If, however, we map in 2 pages, the 2nd page is not accessible
1545 * and will give a "Bus Error" on access. To get around this, we check
1546 * if we need any extra pages for the jump islands and map them in
1547 * anonymously. We must check that we actually require extra pages
1548 * otherwise the attempt to mmap 0 pages of anonymous memory will
1554 /* The effect of this mremap() call is only the ensure that we have
1555 * a sufficient number of virtually contiguous pages. As returned from
1556 * mremap, the pages past the end of the file are not backed. We give
1557 * them a backing by using MAP_FIXED to map in anonymous pages.
1559 oc->image = mremap( oc->image, n, m, MREMAP_MAYMOVE );
1561 if( oc->image == MAP_FAILED )
1563 errorBelch( "Unable to mremap for Jump Islands\n" );
1567 if( mmap( oc->image + n, m - n, PROT_READ | PROT_WRITE | PROT_EXEC,
1568 MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED, 0, 0 ) == MAP_FAILED )
1570 errorBelch( "Unable to mmap( MAP_FIXED ) for Jump Islands\n" );
1576 oc->image -= misalignment;
1577 oc->image = stgReallocBytes( oc->image,
1579 aligned + sizeof (SymbolExtra) * count,
1580 "ocAllocateSymbolExtras" );
1581 oc->image += misalignment;
1582 #endif /* USE_MMAP */
1584 oc->symbol_extras = (SymbolExtra *) (oc->image + aligned);
1585 memset( oc->symbol_extras, 0, sizeof (SymbolExtra) * count );
1588 oc->symbol_extras = NULL;
1590 oc->first_symbol_extra = first;
1591 oc->n_symbol_extras = count;
1596 static SymbolExtra* makeSymbolExtra( ObjectCode* oc,
1597 unsigned long symbolNumber,
1598 unsigned long target )
1602 ASSERT( symbolNumber >= oc->first_symbol_extra
1603 && symbolNumber - oc->first_symbol_extra < oc->n_symbol_extras);
1605 extra = &oc->symbol_extras[symbolNumber - oc->first_symbol_extra];
1607 #ifdef powerpc_HOST_ARCH
1608 // lis r12, hi16(target)
1609 extra->jumpIsland.lis_r12 = 0x3d80;
1610 extra->jumpIsland.hi_addr = target >> 16;
1612 // ori r12, r12, lo16(target)
1613 extra->jumpIsland.ori_r12_r12 = 0x618c;
1614 extra->jumpIsland.lo_addr = target & 0xffff;
1617 extra->jumpIsland.mtctr_r12 = 0x7d8903a6;
1620 extra->jumpIsland.bctr = 0x4e800420;
1622 #ifdef x86_64_HOST_ARCH
1624 static uint8_t jmp[] = { 0xFF, 0x25, 0xF2, 0xFF, 0xFF, 0xFF };
1625 extra->addr = target;
1626 memcpy(extra->jumpIsland, jmp, 6);
1634 /* --------------------------------------------------------------------------
1635 * PowerPC specifics (instruction cache flushing)
1636 * ------------------------------------------------------------------------*/
1638 #ifdef powerpc_TARGET_ARCH
1640 ocFlushInstructionCache
1642 Flush the data & instruction caches.
1643 Because the PPC has split data/instruction caches, we have to
1644 do that whenever we modify code at runtime.
1647 static void ocFlushInstructionCache( ObjectCode *oc )
1649 int n = (oc->fileSize + sizeof( SymbolExtra ) * oc->n_symbol_extras + 3) / 4;
1650 unsigned long *p = (unsigned long *) oc->image;
1654 __asm__ volatile ( "dcbf 0,%0\n\t"
1662 __asm__ volatile ( "sync\n\t"
1668 /* --------------------------------------------------------------------------
1669 * PEi386 specifics (Win32 targets)
1670 * ------------------------------------------------------------------------*/
1672 /* The information for this linker comes from
1673 Microsoft Portable Executable
1674 and Common Object File Format Specification
1675 revision 5.1 January 1998
1676 which SimonM says comes from the MS Developer Network CDs.
1678 It can be found there (on older CDs), but can also be found
1681 http://www.microsoft.com/hwdev/hardware/PECOFF.asp
1683 (this is Rev 6.0 from February 1999).
1685 Things move, so if that fails, try searching for it via
1687 http://www.google.com/search?q=PE+COFF+specification
1689 The ultimate reference for the PE format is the Winnt.h
1690 header file that comes with the Platform SDKs; as always,
1691 implementations will drift wrt their documentation.
1693 A good background article on the PE format is Matt Pietrek's
1694 March 1994 article in Microsoft System Journal (MSJ)
1695 (Vol.9, No. 3): "Peering Inside the PE: A Tour of the
1696 Win32 Portable Executable File Format." The info in there
1697 has recently been updated in a two part article in
1698 MSDN magazine, issues Feb and March 2002,
1699 "Inside Windows: An In-Depth Look into the Win32 Portable
1700 Executable File Format"
1702 John Levine's book "Linkers and Loaders" contains useful
1707 #if defined(OBJFORMAT_PEi386)
1711 typedef unsigned char UChar;
1712 typedef unsigned short UInt16;
1713 typedef unsigned int UInt32;
1720 UInt16 NumberOfSections;
1721 UInt32 TimeDateStamp;
1722 UInt32 PointerToSymbolTable;
1723 UInt32 NumberOfSymbols;
1724 UInt16 SizeOfOptionalHeader;
1725 UInt16 Characteristics;
1729 #define sizeof_COFF_header 20
1736 UInt32 VirtualAddress;
1737 UInt32 SizeOfRawData;
1738 UInt32 PointerToRawData;
1739 UInt32 PointerToRelocations;
1740 UInt32 PointerToLinenumbers;
1741 UInt16 NumberOfRelocations;
1742 UInt16 NumberOfLineNumbers;
1743 UInt32 Characteristics;
1747 #define sizeof_COFF_section 40
1754 UInt16 SectionNumber;
1757 UChar NumberOfAuxSymbols;
1761 #define sizeof_COFF_symbol 18
1766 UInt32 VirtualAddress;
1767 UInt32 SymbolTableIndex;
1772 #define sizeof_COFF_reloc 10
1775 /* From PE spec doc, section 3.3.2 */
1776 /* Note use of MYIMAGE_* since IMAGE_* are already defined in
1777 windows.h -- for the same purpose, but I want to know what I'm
1779 #define MYIMAGE_FILE_RELOCS_STRIPPED 0x0001
1780 #define MYIMAGE_FILE_EXECUTABLE_IMAGE 0x0002
1781 #define MYIMAGE_FILE_DLL 0x2000
1782 #define MYIMAGE_FILE_SYSTEM 0x1000
1783 #define MYIMAGE_FILE_BYTES_REVERSED_HI 0x8000
1784 #define MYIMAGE_FILE_BYTES_REVERSED_LO 0x0080
1785 #define MYIMAGE_FILE_32BIT_MACHINE 0x0100
1787 /* From PE spec doc, section 5.4.2 and 5.4.4 */
1788 #define MYIMAGE_SYM_CLASS_EXTERNAL 2
1789 #define MYIMAGE_SYM_CLASS_STATIC 3
1790 #define MYIMAGE_SYM_UNDEFINED 0
1792 /* From PE spec doc, section 4.1 */
1793 #define MYIMAGE_SCN_CNT_CODE 0x00000020
1794 #define MYIMAGE_SCN_CNT_INITIALIZED_DATA 0x00000040
1795 #define MYIMAGE_SCN_LNK_NRELOC_OVFL 0x01000000
1797 /* From PE spec doc, section 5.2.1 */
1798 #define MYIMAGE_REL_I386_DIR32 0x0006
1799 #define MYIMAGE_REL_I386_REL32 0x0014
1802 /* We use myindex to calculate array addresses, rather than
1803 simply doing the normal subscript thing. That's because
1804 some of the above structs have sizes which are not
1805 a whole number of words. GCC rounds their sizes up to a
1806 whole number of words, which means that the address calcs
1807 arising from using normal C indexing or pointer arithmetic
1808 are just plain wrong. Sigh.
1811 myindex ( int scale, void* base, int index )
1814 ((UChar*)base) + scale * index;
1819 printName ( UChar* name, UChar* strtab )
1821 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
1822 UInt32 strtab_offset = * (UInt32*)(name+4);
1823 debugBelch("%s", strtab + strtab_offset );
1826 for (i = 0; i < 8; i++) {
1827 if (name[i] == 0) break;
1828 debugBelch("%c", name[i] );
1835 copyName ( UChar* name, UChar* strtab, UChar* dst, int dstSize )
1837 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
1838 UInt32 strtab_offset = * (UInt32*)(name+4);
1839 strncpy ( dst, strtab+strtab_offset, dstSize );
1845 if (name[i] == 0) break;
1855 cstring_from_COFF_symbol_name ( UChar* name, UChar* strtab )
1858 /* If the string is longer than 8 bytes, look in the
1859 string table for it -- this will be correctly zero terminated.
1861 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
1862 UInt32 strtab_offset = * (UInt32*)(name+4);
1863 return ((UChar*)strtab) + strtab_offset;
1865 /* Otherwise, if shorter than 8 bytes, return the original,
1866 which by defn is correctly terminated.
1868 if (name[7]==0) return name;
1869 /* The annoying case: 8 bytes. Copy into a temporary
1870 (which is never freed ...)
1872 newstr = stgMallocBytes(9, "cstring_from_COFF_symbol_name");
1874 strncpy(newstr,name,8);
1880 /* Just compares the short names (first 8 chars) */
1881 static COFF_section *
1882 findPEi386SectionCalled ( ObjectCode* oc, char* name )
1886 = (COFF_header*)(oc->image);
1887 COFF_section* sectab
1889 ((UChar*)(oc->image))
1890 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
1892 for (i = 0; i < hdr->NumberOfSections; i++) {
1895 COFF_section* section_i
1897 myindex ( sizeof_COFF_section, sectab, i );
1898 n1 = (UChar*) &(section_i->Name);
1900 if (n1[0]==n2[0] && n1[1]==n2[1] && n1[2]==n2[2] &&
1901 n1[3]==n2[3] && n1[4]==n2[4] && n1[5]==n2[5] &&
1902 n1[6]==n2[6] && n1[7]==n2[7])
1911 zapTrailingAtSign ( UChar* sym )
1913 # define my_isdigit(c) ((c) >= '0' && (c) <= '9')
1915 if (sym[0] == 0) return;
1917 while (sym[i] != 0) i++;
1920 while (j > 0 && my_isdigit(sym[j])) j--;
1921 if (j > 0 && sym[j] == '@' && j != i) sym[j] = 0;
1927 ocVerifyImage_PEi386 ( ObjectCode* oc )
1932 COFF_section* sectab;
1933 COFF_symbol* symtab;
1935 /* debugBelch("\nLOADING %s\n", oc->fileName); */
1936 hdr = (COFF_header*)(oc->image);
1937 sectab = (COFF_section*) (
1938 ((UChar*)(oc->image))
1939 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
1941 symtab = (COFF_symbol*) (
1942 ((UChar*)(oc->image))
1943 + hdr->PointerToSymbolTable
1945 strtab = ((UChar*)symtab)
1946 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
1948 if (hdr->Machine != 0x14c) {
1949 errorBelch("%s: Not x86 PEi386", oc->fileName);
1952 if (hdr->SizeOfOptionalHeader != 0) {
1953 errorBelch("%s: PEi386 with nonempty optional header", oc->fileName);
1956 if ( /* (hdr->Characteristics & MYIMAGE_FILE_RELOCS_STRIPPED) || */
1957 (hdr->Characteristics & MYIMAGE_FILE_EXECUTABLE_IMAGE) ||
1958 (hdr->Characteristics & MYIMAGE_FILE_DLL) ||
1959 (hdr->Characteristics & MYIMAGE_FILE_SYSTEM) ) {
1960 errorBelch("%s: Not a PEi386 object file", oc->fileName);
1963 if ( (hdr->Characteristics & MYIMAGE_FILE_BYTES_REVERSED_HI)
1964 /* || !(hdr->Characteristics & MYIMAGE_FILE_32BIT_MACHINE) */ ) {
1965 errorBelch("%s: Invalid PEi386 word size or endiannness: %d",
1967 (int)(hdr->Characteristics));
1970 /* If the string table size is way crazy, this might indicate that
1971 there are more than 64k relocations, despite claims to the
1972 contrary. Hence this test. */
1973 /* debugBelch("strtab size %d\n", * (UInt32*)strtab); */
1975 if ( (*(UInt32*)strtab) > 600000 ) {
1976 /* Note that 600k has no special significance other than being
1977 big enough to handle the almost-2MB-sized lumps that
1978 constitute HSwin32*.o. */
1979 debugBelch("PEi386 object has suspiciously large string table; > 64k relocs?");
1984 /* No further verification after this point; only debug printing. */
1986 IF_DEBUG(linker, i=1);
1987 if (i == 0) return 1;
1989 debugBelch( "sectab offset = %d\n", ((UChar*)sectab) - ((UChar*)hdr) );
1990 debugBelch( "symtab offset = %d\n", ((UChar*)symtab) - ((UChar*)hdr) );
1991 debugBelch( "strtab offset = %d\n", ((UChar*)strtab) - ((UChar*)hdr) );
1994 debugBelch( "Machine: 0x%x\n", (UInt32)(hdr->Machine) );
1995 debugBelch( "# sections: %d\n", (UInt32)(hdr->NumberOfSections) );
1996 debugBelch( "time/date: 0x%x\n", (UInt32)(hdr->TimeDateStamp) );
1997 debugBelch( "symtab offset: %d\n", (UInt32)(hdr->PointerToSymbolTable) );
1998 debugBelch( "# symbols: %d\n", (UInt32)(hdr->NumberOfSymbols) );
1999 debugBelch( "sz of opt hdr: %d\n", (UInt32)(hdr->SizeOfOptionalHeader) );
2000 debugBelch( "characteristics: 0x%x\n", (UInt32)(hdr->Characteristics) );
2002 /* Print the section table. */
2004 for (i = 0; i < hdr->NumberOfSections; i++) {
2006 COFF_section* sectab_i
2008 myindex ( sizeof_COFF_section, sectab, i );
2015 printName ( sectab_i->Name, strtab );
2025 sectab_i->VirtualSize,
2026 sectab_i->VirtualAddress,
2027 sectab_i->SizeOfRawData,
2028 sectab_i->PointerToRawData,
2029 sectab_i->NumberOfRelocations,
2030 sectab_i->PointerToRelocations,
2031 sectab_i->PointerToRawData
2033 reltab = (COFF_reloc*) (
2034 ((UChar*)(oc->image)) + sectab_i->PointerToRelocations
2037 if ( sectab_i->Characteristics & MYIMAGE_SCN_LNK_NRELOC_OVFL ) {
2038 /* If the relocation field (a short) has overflowed, the
2039 * real count can be found in the first reloc entry.
2041 * See Section 4.1 (last para) of the PE spec (rev6.0).
2043 COFF_reloc* rel = (COFF_reloc*)
2044 myindex ( sizeof_COFF_reloc, reltab, 0 );
2045 noRelocs = rel->VirtualAddress;
2048 noRelocs = sectab_i->NumberOfRelocations;
2052 for (; j < noRelocs; j++) {
2054 COFF_reloc* rel = (COFF_reloc*)
2055 myindex ( sizeof_COFF_reloc, reltab, j );
2057 " type 0x%-4x vaddr 0x%-8x name `",
2059 rel->VirtualAddress );
2060 sym = (COFF_symbol*)
2061 myindex ( sizeof_COFF_symbol, symtab, rel->SymbolTableIndex );
2062 /* Hmm..mysterious looking offset - what's it for? SOF */
2063 printName ( sym->Name, strtab -10 );
2070 debugBelch("string table has size 0x%x\n", * (UInt32*)strtab );
2071 debugBelch("---START of string table---\n");
2072 for (i = 4; i < *(Int32*)strtab; i++) {
2074 debugBelch("\n"); else
2075 debugBelch("%c", strtab[i] );
2077 debugBelch("--- END of string table---\n");
2082 COFF_symbol* symtab_i;
2083 if (i >= (Int32)(hdr->NumberOfSymbols)) break;
2084 symtab_i = (COFF_symbol*)
2085 myindex ( sizeof_COFF_symbol, symtab, i );
2091 printName ( symtab_i->Name, strtab );
2100 (Int32)(symtab_i->SectionNumber),
2101 (UInt32)symtab_i->Type,
2102 (UInt32)symtab_i->StorageClass,
2103 (UInt32)symtab_i->NumberOfAuxSymbols
2105 i += symtab_i->NumberOfAuxSymbols;
2115 ocGetNames_PEi386 ( ObjectCode* oc )
2118 COFF_section* sectab;
2119 COFF_symbol* symtab;
2126 hdr = (COFF_header*)(oc->image);
2127 sectab = (COFF_section*) (
2128 ((UChar*)(oc->image))
2129 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2131 symtab = (COFF_symbol*) (
2132 ((UChar*)(oc->image))
2133 + hdr->PointerToSymbolTable
2135 strtab = ((UChar*)(oc->image))
2136 + hdr->PointerToSymbolTable
2137 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
2139 /* Allocate space for any (local, anonymous) .bss sections. */
2141 for (i = 0; i < hdr->NumberOfSections; i++) {
2144 COFF_section* sectab_i
2146 myindex ( sizeof_COFF_section, sectab, i );
2147 if (0 != strcmp(sectab_i->Name, ".bss")) continue;
2148 /* sof 10/05: the PE spec text isn't too clear regarding what
2149 * the SizeOfRawData field is supposed to hold for object
2150 * file sections containing just uninitialized data -- for executables,
2151 * it is supposed to be zero; unclear what it's supposed to be
2152 * for object files. However, VirtualSize is guaranteed to be
2153 * zero for object files, which definitely suggests that SizeOfRawData
2154 * will be non-zero (where else would the size of this .bss section be
2155 * stored?) Looking at the COFF_section info for incoming object files,
2156 * this certainly appears to be the case.
2158 * => I suspect we've been incorrectly handling .bss sections in (relocatable)
2159 * object files up until now. This turned out to bite us with ghc-6.4.1's use
2160 * of gcc-3.4.x, which has started to emit initially-zeroed-out local 'static'
2161 * variable decls into to the .bss section. (The specific function in Q which
2162 * triggered this is libraries/base/cbits/dirUtils.c:__hscore_getFolderPath())
2164 if (sectab_i->VirtualSize == 0 && sectab_i->SizeOfRawData == 0) continue;
2165 /* This is a non-empty .bss section. Allocate zeroed space for
2166 it, and set its PointerToRawData field such that oc->image +
2167 PointerToRawData == addr_of_zeroed_space. */
2168 bss_sz = sectab_i->VirtualSize;
2169 if ( bss_sz < sectab_i->SizeOfRawData) { bss_sz = sectab_i->SizeOfRawData; }
2170 zspace = stgCallocBytes(1, bss_sz, "ocGetNames_PEi386(anonymous bss)");
2171 sectab_i->PointerToRawData = ((UChar*)zspace) - ((UChar*)(oc->image));
2172 addProddableBlock(oc, zspace, bss_sz);
2173 /* debugBelch("BSS anon section at 0x%x\n", zspace); */
2176 /* Copy section information into the ObjectCode. */
2178 for (i = 0; i < hdr->NumberOfSections; i++) {
2184 = SECTIONKIND_OTHER;
2185 COFF_section* sectab_i
2187 myindex ( sizeof_COFF_section, sectab, i );
2188 IF_DEBUG(linker, debugBelch("section name = %s\n", sectab_i->Name ));
2191 /* I'm sure this is the Right Way to do it. However, the
2192 alternative of testing the sectab_i->Name field seems to
2193 work ok with Cygwin.
2195 if (sectab_i->Characteristics & MYIMAGE_SCN_CNT_CODE ||
2196 sectab_i->Characteristics & MYIMAGE_SCN_CNT_INITIALIZED_DATA)
2197 kind = SECTIONKIND_CODE_OR_RODATA;
2200 if (0==strcmp(".text",sectab_i->Name) ||
2201 0==strcmp(".rdata",sectab_i->Name)||
2202 0==strcmp(".rodata",sectab_i->Name))
2203 kind = SECTIONKIND_CODE_OR_RODATA;
2204 if (0==strcmp(".data",sectab_i->Name) ||
2205 0==strcmp(".bss",sectab_i->Name))
2206 kind = SECTIONKIND_RWDATA;
2208 ASSERT(sectab_i->SizeOfRawData == 0 || sectab_i->VirtualSize == 0);
2209 sz = sectab_i->SizeOfRawData;
2210 if (sz < sectab_i->VirtualSize) sz = sectab_i->VirtualSize;
2212 start = ((UChar*)(oc->image)) + sectab_i->PointerToRawData;
2213 end = start + sz - 1;
2215 if (kind == SECTIONKIND_OTHER
2216 /* Ignore sections called which contain stabs debugging
2218 && 0 != strcmp(".stab", sectab_i->Name)
2219 && 0 != strcmp(".stabstr", sectab_i->Name)
2220 /* ignore constructor section for now */
2221 && 0 != strcmp(".ctors", sectab_i->Name)
2222 /* ignore section generated from .ident */
2223 && 0!= strcmp("/4", sectab_i->Name)
2225 errorBelch("Unknown PEi386 section name `%s' (while processing: %s)", sectab_i->Name, oc->fileName);
2229 if (kind != SECTIONKIND_OTHER && end >= start) {
2230 addSection(oc, kind, start, end);
2231 addProddableBlock(oc, start, end - start + 1);
2235 /* Copy exported symbols into the ObjectCode. */
2237 oc->n_symbols = hdr->NumberOfSymbols;
2238 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
2239 "ocGetNames_PEi386(oc->symbols)");
2240 /* Call me paranoid; I don't care. */
2241 for (i = 0; i < oc->n_symbols; i++)
2242 oc->symbols[i] = NULL;
2246 COFF_symbol* symtab_i;
2247 if (i >= (Int32)(hdr->NumberOfSymbols)) break;
2248 symtab_i = (COFF_symbol*)
2249 myindex ( sizeof_COFF_symbol, symtab, i );
2253 if (symtab_i->StorageClass == MYIMAGE_SYM_CLASS_EXTERNAL
2254 && symtab_i->SectionNumber != MYIMAGE_SYM_UNDEFINED) {
2255 /* This symbol is global and defined, viz, exported */
2256 /* for MYIMAGE_SYMCLASS_EXTERNAL
2257 && !MYIMAGE_SYM_UNDEFINED,
2258 the address of the symbol is:
2259 address of relevant section + offset in section
2261 COFF_section* sectabent
2262 = (COFF_section*) myindex ( sizeof_COFF_section,
2264 symtab_i->SectionNumber-1 );
2265 addr = ((UChar*)(oc->image))
2266 + (sectabent->PointerToRawData
2270 if (symtab_i->SectionNumber == MYIMAGE_SYM_UNDEFINED
2271 && symtab_i->Value > 0) {
2272 /* This symbol isn't in any section at all, ie, global bss.
2273 Allocate zeroed space for it. */
2274 addr = stgCallocBytes(1, symtab_i->Value,
2275 "ocGetNames_PEi386(non-anonymous bss)");
2276 addSection(oc, SECTIONKIND_RWDATA, addr,
2277 ((UChar*)addr) + symtab_i->Value - 1);
2278 addProddableBlock(oc, addr, symtab_i->Value);
2279 /* debugBelch("BSS section at 0x%x\n", addr); */
2282 if (addr != NULL ) {
2283 sname = cstring_from_COFF_symbol_name ( symtab_i->Name, strtab );
2284 /* debugBelch("addSymbol %p `%s \n", addr,sname); */
2285 IF_DEBUG(linker, debugBelch("addSymbol %p `%s'\n", addr,sname);)
2286 ASSERT(i >= 0 && i < oc->n_symbols);
2287 /* cstring_from_COFF_symbol_name always succeeds. */
2288 oc->symbols[i] = sname;
2289 ghciInsertStrHashTable(oc->fileName, symhash, sname, addr);
2293 "IGNORING symbol %d\n"
2297 printName ( symtab_i->Name, strtab );
2306 (Int32)(symtab_i->SectionNumber),
2307 (UInt32)symtab_i->Type,
2308 (UInt32)symtab_i->StorageClass,
2309 (UInt32)symtab_i->NumberOfAuxSymbols
2314 i += symtab_i->NumberOfAuxSymbols;
2323 ocResolve_PEi386 ( ObjectCode* oc )
2326 COFF_section* sectab;
2327 COFF_symbol* symtab;
2337 /* ToDo: should be variable-sized? But is at least safe in the
2338 sense of buffer-overrun-proof. */
2340 /* debugBelch("resolving for %s\n", oc->fileName); */
2342 hdr = (COFF_header*)(oc->image);
2343 sectab = (COFF_section*) (
2344 ((UChar*)(oc->image))
2345 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2347 symtab = (COFF_symbol*) (
2348 ((UChar*)(oc->image))
2349 + hdr->PointerToSymbolTable
2351 strtab = ((UChar*)(oc->image))
2352 + hdr->PointerToSymbolTable
2353 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
2355 for (i = 0; i < hdr->NumberOfSections; i++) {
2356 COFF_section* sectab_i
2358 myindex ( sizeof_COFF_section, sectab, i );
2361 ((UChar*)(oc->image)) + sectab_i->PointerToRelocations
2364 /* Ignore sections called which contain stabs debugging
2366 if (0 == strcmp(".stab", sectab_i->Name)
2367 || 0 == strcmp(".stabstr", sectab_i->Name)
2368 || 0 == strcmp(".ctors", sectab_i->Name))
2371 if ( sectab_i->Characteristics & MYIMAGE_SCN_LNK_NRELOC_OVFL ) {
2372 /* If the relocation field (a short) has overflowed, the
2373 * real count can be found in the first reloc entry.
2375 * See Section 4.1 (last para) of the PE spec (rev6.0).
2377 * Nov2003 update: the GNU linker still doesn't correctly
2378 * handle the generation of relocatable object files with
2379 * overflown relocations. Hence the output to warn of potential
2382 COFF_reloc* rel = (COFF_reloc*)
2383 myindex ( sizeof_COFF_reloc, reltab, 0 );
2384 noRelocs = rel->VirtualAddress;
2386 /* 10/05: we now assume (and check for) a GNU ld that is capable
2387 * of handling object files with (>2^16) of relocs.
2390 debugBelch("WARNING: Overflown relocation field (# relocs found: %u)\n",
2395 noRelocs = sectab_i->NumberOfRelocations;
2400 for (; j < noRelocs; j++) {
2402 COFF_reloc* reltab_j
2404 myindex ( sizeof_COFF_reloc, reltab, j );
2406 /* the location to patch */
2408 ((UChar*)(oc->image))
2409 + (sectab_i->PointerToRawData
2410 + reltab_j->VirtualAddress
2411 - sectab_i->VirtualAddress )
2413 /* the existing contents of pP */
2415 /* the symbol to connect to */
2416 sym = (COFF_symbol*)
2417 myindex ( sizeof_COFF_symbol,
2418 symtab, reltab_j->SymbolTableIndex );
2421 "reloc sec %2d num %3d: type 0x%-4x "
2422 "vaddr 0x%-8x name `",
2424 (UInt32)reltab_j->Type,
2425 reltab_j->VirtualAddress );
2426 printName ( sym->Name, strtab );
2427 debugBelch("'\n" ));
2429 if (sym->StorageClass == MYIMAGE_SYM_CLASS_STATIC) {
2430 COFF_section* section_sym
2431 = findPEi386SectionCalled ( oc, sym->Name );
2433 errorBelch("%s: can't find section `%s'", oc->fileName, sym->Name);
2436 S = ((UInt32)(oc->image))
2437 + (section_sym->PointerToRawData
2440 copyName ( sym->Name, strtab, symbol, 1000-1 );
2441 S = (UInt32) lookupLocalSymbol( oc, symbol );
2442 if ((void*)S != NULL) goto foundit;
2443 S = (UInt32) lookupSymbol( symbol );
2444 if ((void*)S != NULL) goto foundit;
2445 zapTrailingAtSign ( symbol );
2446 S = (UInt32) lookupLocalSymbol( oc, symbol );
2447 if ((void*)S != NULL) goto foundit;
2448 S = (UInt32) lookupSymbol( symbol );
2449 if ((void*)S != NULL) goto foundit;
2450 /* Newline first because the interactive linker has printed "linking..." */
2451 errorBelch("\n%s: unknown symbol `%s'", oc->fileName, symbol);
2455 checkProddableBlock(oc, pP);
2456 switch (reltab_j->Type) {
2457 case MYIMAGE_REL_I386_DIR32:
2460 case MYIMAGE_REL_I386_REL32:
2461 /* Tricky. We have to insert a displacement at
2462 pP which, when added to the PC for the _next_
2463 insn, gives the address of the target (S).
2464 Problem is to know the address of the next insn
2465 when we only know pP. We assume that this
2466 literal field is always the last in the insn,
2467 so that the address of the next insn is pP+4
2468 -- hence the constant 4.
2469 Also I don't know if A should be added, but so
2470 far it has always been zero.
2472 SOF 05/2005: 'A' (old contents of *pP) have been observed
2473 to contain values other than zero (the 'wx' object file
2474 that came with wxhaskell-0.9.4; dunno how it was compiled..).
2475 So, add displacement to old value instead of asserting
2476 A to be zero. Fixes wxhaskell-related crashes, and no other
2477 ill effects have been observed.
2479 Update: the reason why we're seeing these more elaborate
2480 relocations is due to a switch in how the NCG compiles SRTs
2481 and offsets to them from info tables. SRTs live in .(ro)data,
2482 while info tables live in .text, causing GAS to emit REL32/DISP32
2483 relocations with non-zero values. Adding the displacement is
2484 the right thing to do.
2486 *pP = S - ((UInt32)pP) - 4 + A;
2489 debugBelch("%s: unhandled PEi386 relocation type %d",
2490 oc->fileName, reltab_j->Type);
2497 IF_DEBUG(linker, debugBelch("completed %s", oc->fileName));
2501 #endif /* defined(OBJFORMAT_PEi386) */
2504 /* --------------------------------------------------------------------------
2506 * ------------------------------------------------------------------------*/
2508 #if defined(OBJFORMAT_ELF)
2513 #if defined(sparc_HOST_ARCH)
2514 # define ELF_TARGET_SPARC /* Used inside <elf.h> */
2515 #elif defined(i386_HOST_ARCH)
2516 # define ELF_TARGET_386 /* Used inside <elf.h> */
2517 #elif defined(x86_64_HOST_ARCH)
2518 # define ELF_TARGET_X64_64
2520 #elif defined (ia64_HOST_ARCH)
2521 # define ELF_TARGET_IA64 /* Used inside <elf.h> */
2523 # define ELF_FUNCTION_DESC /* calling convention uses function descriptors */
2524 # define ELF_NEED_GOT /* needs Global Offset Table */
2525 # define ELF_NEED_PLT /* needs Procedure Linkage Tables */
2528 #if !defined(openbsd_HOST_OS)
2531 /* openbsd elf has things in different places, with diff names */
2532 #include <elf_abi.h>
2533 #include <machine/reloc.h>
2534 #define R_386_32 RELOC_32
2535 #define R_386_PC32 RELOC_PC32
2539 * Define a set of types which can be used for both ELF32 and ELF64
2543 #define ELFCLASS ELFCLASS64
2544 #define Elf_Addr Elf64_Addr
2545 #define Elf_Word Elf64_Word
2546 #define Elf_Sword Elf64_Sword
2547 #define Elf_Ehdr Elf64_Ehdr
2548 #define Elf_Phdr Elf64_Phdr
2549 #define Elf_Shdr Elf64_Shdr
2550 #define Elf_Sym Elf64_Sym
2551 #define Elf_Rel Elf64_Rel
2552 #define Elf_Rela Elf64_Rela
2553 #define ELF_ST_TYPE ELF64_ST_TYPE
2554 #define ELF_ST_BIND ELF64_ST_BIND
2555 #define ELF_R_TYPE ELF64_R_TYPE
2556 #define ELF_R_SYM ELF64_R_SYM
2558 #define ELFCLASS ELFCLASS32
2559 #define Elf_Addr Elf32_Addr
2560 #define Elf_Word Elf32_Word
2561 #define Elf_Sword Elf32_Sword
2562 #define Elf_Ehdr Elf32_Ehdr
2563 #define Elf_Phdr Elf32_Phdr
2564 #define Elf_Shdr Elf32_Shdr
2565 #define Elf_Sym Elf32_Sym
2566 #define Elf_Rel Elf32_Rel
2567 #define Elf_Rela Elf32_Rela
2569 #define ELF_ST_TYPE ELF32_ST_TYPE
2572 #define ELF_ST_BIND ELF32_ST_BIND
2575 #define ELF_R_TYPE ELF32_R_TYPE
2578 #define ELF_R_SYM ELF32_R_SYM
2584 * Functions to allocate entries in dynamic sections. Currently we simply
2585 * preallocate a large number, and we don't check if a entry for the given
2586 * target already exists (a linear search is too slow). Ideally these
2587 * entries would be associated with symbols.
2590 /* These sizes sufficient to load HSbase + HShaskell98 + a few modules */
2591 #define GOT_SIZE 0x20000
2592 #define FUNCTION_TABLE_SIZE 0x10000
2593 #define PLT_SIZE 0x08000
2596 static Elf_Addr got[GOT_SIZE];
2597 static unsigned int gotIndex;
2598 static Elf_Addr gp_val = (Elf_Addr)got;
2601 allocateGOTEntry(Elf_Addr target)
2605 if (gotIndex >= GOT_SIZE)
2606 barf("Global offset table overflow");
2608 entry = &got[gotIndex++];
2610 return (Elf_Addr)entry;
2614 #ifdef ELF_FUNCTION_DESC
2620 static FunctionDesc functionTable[FUNCTION_TABLE_SIZE];
2621 static unsigned int functionTableIndex;
2624 allocateFunctionDesc(Elf_Addr target)
2626 FunctionDesc *entry;
2628 if (functionTableIndex >= FUNCTION_TABLE_SIZE)
2629 barf("Function table overflow");
2631 entry = &functionTable[functionTableIndex++];
2633 entry->gp = (Elf_Addr)gp_val;
2634 return (Elf_Addr)entry;
2638 copyFunctionDesc(Elf_Addr target)
2640 FunctionDesc *olddesc = (FunctionDesc *)target;
2641 FunctionDesc *newdesc;
2643 newdesc = (FunctionDesc *)allocateFunctionDesc(olddesc->ip);
2644 newdesc->gp = olddesc->gp;
2645 return (Elf_Addr)newdesc;
2650 #ifdef ia64_HOST_ARCH
2651 static void ia64_reloc_gprel22(Elf_Addr target, Elf_Addr value);
2652 static void ia64_reloc_pcrel21(Elf_Addr target, Elf_Addr value, ObjectCode *oc);
2654 static unsigned char plt_code[] =
2656 /* taken from binutils bfd/elfxx-ia64.c */
2657 0x0b, 0x78, 0x00, 0x02, 0x00, 0x24, /* [MMI] addl r15=0,r1;; */
2658 0x00, 0x41, 0x3c, 0x30, 0x28, 0xc0, /* ld8 r16=[r15],8 */
2659 0x01, 0x08, 0x00, 0x84, /* mov r14=r1;; */
2660 0x11, 0x08, 0x00, 0x1e, 0x18, 0x10, /* [MIB] ld8 r1=[r15] */
2661 0x60, 0x80, 0x04, 0x80, 0x03, 0x00, /* mov b6=r16 */
2662 0x60, 0x00, 0x80, 0x00 /* br.few b6;; */
2665 /* If we can't get to the function descriptor via gp, take a local copy of it */
2666 #define PLT_RELOC(code, target) { \
2667 Elf64_Sxword rel_value = target - gp_val; \
2668 if ((rel_value > 0x1fffff) || (rel_value < -0x1fffff)) \
2669 ia64_reloc_gprel22((Elf_Addr)code, copyFunctionDesc(target)); \
2671 ia64_reloc_gprel22((Elf_Addr)code, target); \
2676 unsigned char code[sizeof(plt_code)];
2680 allocatePLTEntry(Elf_Addr target, ObjectCode *oc)
2682 PLTEntry *plt = (PLTEntry *)oc->plt;
2685 if (oc->pltIndex >= PLT_SIZE)
2686 barf("Procedure table overflow");
2688 entry = &plt[oc->pltIndex++];
2689 memcpy(entry->code, plt_code, sizeof(entry->code));
2690 PLT_RELOC(entry->code, target);
2691 return (Elf_Addr)entry;
2697 return (PLT_SIZE * sizeof(PLTEntry));
2702 #if x86_64_HOST_ARCH
2703 // On x86_64, 32-bit relocations are often used, which requires that
2704 // we can resolve a symbol to a 32-bit offset. However, shared
2705 // libraries are placed outside the 2Gb area, which leaves us with a
2706 // problem when we need to give a 32-bit offset to a symbol in a
2709 // For a function symbol, we can allocate a bounce sequence inside the
2710 // 2Gb area and resolve the symbol to this. The bounce sequence is
2711 // simply a long jump instruction to the real location of the symbol.
2713 // For data references, we're screwed.
2716 unsigned char jmp[8]; /* 6 byte instruction: jmpq *0x00000002(%rip) */
2720 #define X86_64_BB_SIZE 1024
2722 static x86_64_bounce *x86_64_bounce_buffer = NULL;
2723 static nat x86_64_bb_next_off;
2726 x86_64_high_symbol( char *lbl, void *addr )
2728 x86_64_bounce *bounce;
2730 if ( x86_64_bounce_buffer == NULL ||
2731 x86_64_bb_next_off >= X86_64_BB_SIZE ) {
2732 x86_64_bounce_buffer =
2733 mmap(NULL, X86_64_BB_SIZE * sizeof(x86_64_bounce),
2734 PROT_EXEC|PROT_READ|PROT_WRITE,
2735 MAP_PRIVATE|MAP_32BIT|MAP_ANONYMOUS, -1, 0);
2736 if (x86_64_bounce_buffer == MAP_FAILED) {
2737 barf("x86_64_high_symbol: mmap failed");
2739 x86_64_bb_next_off = 0;
2741 bounce = &x86_64_bounce_buffer[x86_64_bb_next_off];
2742 bounce->jmp[0] = 0xff;
2743 bounce->jmp[1] = 0x25;
2744 bounce->jmp[2] = 0x02;
2745 bounce->jmp[3] = 0x00;
2746 bounce->jmp[4] = 0x00;
2747 bounce->jmp[5] = 0x00;
2748 bounce->addr = addr;
2749 x86_64_bb_next_off++;
2751 IF_DEBUG(linker, debugBelch("x86_64: allocated bounce entry for %s->%p at %p\n",
2752 lbl, addr, bounce));
2754 insertStrHashTable(symhash, lbl, bounce);
2761 * Generic ELF functions
2765 findElfSection ( void* objImage, Elf_Word sh_type )
2767 char* ehdrC = (char*)objImage;
2768 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2769 Elf_Shdr* shdr = (Elf_Shdr*)(ehdrC + ehdr->e_shoff);
2770 char* sh_strtab = ehdrC + shdr[ehdr->e_shstrndx].sh_offset;
2774 for (i = 0; i < ehdr->e_shnum; i++) {
2775 if (shdr[i].sh_type == sh_type
2776 /* Ignore the section header's string table. */
2777 && i != ehdr->e_shstrndx
2778 /* Ignore string tables named .stabstr, as they contain
2780 && 0 != memcmp(".stabstr", sh_strtab + shdr[i].sh_name, 8)
2782 ptr = ehdrC + shdr[i].sh_offset;
2789 #if defined(ia64_HOST_ARCH)
2791 findElfSegment ( void* objImage, Elf_Addr vaddr )
2793 char* ehdrC = (char*)objImage;
2794 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2795 Elf_Phdr* phdr = (Elf_Phdr*)(ehdrC + ehdr->e_phoff);
2796 Elf_Addr segaddr = 0;
2799 for (i = 0; i < ehdr->e_phnum; i++) {
2800 segaddr = phdr[i].p_vaddr;
2801 if ((vaddr >= segaddr) && (vaddr < segaddr + phdr[i].p_memsz))
2809 ocVerifyImage_ELF ( ObjectCode* oc )
2813 int i, j, nent, nstrtab, nsymtabs;
2817 char* ehdrC = (char*)(oc->image);
2818 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2820 if (ehdr->e_ident[EI_MAG0] != ELFMAG0 ||
2821 ehdr->e_ident[EI_MAG1] != ELFMAG1 ||
2822 ehdr->e_ident[EI_MAG2] != ELFMAG2 ||
2823 ehdr->e_ident[EI_MAG3] != ELFMAG3) {
2824 errorBelch("%s: not an ELF object", oc->fileName);
2828 if (ehdr->e_ident[EI_CLASS] != ELFCLASS) {
2829 errorBelch("%s: unsupported ELF format", oc->fileName);
2833 if (ehdr->e_ident[EI_DATA] == ELFDATA2LSB) {
2834 IF_DEBUG(linker,debugBelch( "Is little-endian\n" ));
2836 if (ehdr->e_ident[EI_DATA] == ELFDATA2MSB) {
2837 IF_DEBUG(linker,debugBelch( "Is big-endian\n" ));
2839 errorBelch("%s: unknown endiannness", oc->fileName);
2843 if (ehdr->e_type != ET_REL) {
2844 errorBelch("%s: not a relocatable object (.o) file", oc->fileName);
2847 IF_DEBUG(linker, debugBelch( "Is a relocatable object (.o) file\n" ));
2849 IF_DEBUG(linker,debugBelch( "Architecture is " ));
2850 switch (ehdr->e_machine) {
2851 case EM_386: IF_DEBUG(linker,debugBelch( "x86" )); break;
2852 #ifdef EM_SPARC32PLUS
2853 case EM_SPARC32PLUS:
2855 case EM_SPARC: IF_DEBUG(linker,debugBelch( "sparc" )); break;
2857 case EM_IA_64: IF_DEBUG(linker,debugBelch( "ia64" )); break;
2859 case EM_PPC: IF_DEBUG(linker,debugBelch( "powerpc32" )); break;
2861 case EM_X86_64: IF_DEBUG(linker,debugBelch( "x86_64" )); break;
2863 default: IF_DEBUG(linker,debugBelch( "unknown" ));
2864 errorBelch("%s: unknown architecture", oc->fileName);
2868 IF_DEBUG(linker,debugBelch(
2869 "\nSection header table: start %ld, n_entries %d, ent_size %d\n",
2870 (long)ehdr->e_shoff, ehdr->e_shnum, ehdr->e_shentsize ));
2872 ASSERT (ehdr->e_shentsize == sizeof(Elf_Shdr));
2874 shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
2876 if (ehdr->e_shstrndx == SHN_UNDEF) {
2877 errorBelch("%s: no section header string table", oc->fileName);
2880 IF_DEBUG(linker,debugBelch( "Section header string table is section %d\n",
2882 sh_strtab = ehdrC + shdr[ehdr->e_shstrndx].sh_offset;
2885 for (i = 0; i < ehdr->e_shnum; i++) {
2886 IF_DEBUG(linker,debugBelch("%2d: ", i ));
2887 IF_DEBUG(linker,debugBelch("type=%2d ", (int)shdr[i].sh_type ));
2888 IF_DEBUG(linker,debugBelch("size=%4d ", (int)shdr[i].sh_size ));
2889 IF_DEBUG(linker,debugBelch("offs=%4d ", (int)shdr[i].sh_offset ));
2890 IF_DEBUG(linker,debugBelch(" (%p .. %p) ",
2891 ehdrC + shdr[i].sh_offset,
2892 ehdrC + shdr[i].sh_offset + shdr[i].sh_size - 1));
2894 if (shdr[i].sh_type == SHT_REL) {
2895 IF_DEBUG(linker,debugBelch("Rel " ));
2896 } else if (shdr[i].sh_type == SHT_RELA) {
2897 IF_DEBUG(linker,debugBelch("RelA " ));
2899 IF_DEBUG(linker,debugBelch(" "));
2902 IF_DEBUG(linker,debugBelch("sname=%s\n", sh_strtab + shdr[i].sh_name ));
2906 IF_DEBUG(linker,debugBelch( "\nString tables" ));
2909 for (i = 0; i < ehdr->e_shnum; i++) {
2910 if (shdr[i].sh_type == SHT_STRTAB
2911 /* Ignore the section header's string table. */
2912 && i != ehdr->e_shstrndx
2913 /* Ignore string tables named .stabstr, as they contain
2915 && 0 != memcmp(".stabstr", sh_strtab + shdr[i].sh_name, 8)
2917 IF_DEBUG(linker,debugBelch(" section %d is a normal string table", i ));
2918 strtab = ehdrC + shdr[i].sh_offset;
2923 errorBelch("%s: no string tables, or too many", oc->fileName);
2928 IF_DEBUG(linker,debugBelch( "\nSymbol tables" ));
2929 for (i = 0; i < ehdr->e_shnum; i++) {
2930 if (shdr[i].sh_type != SHT_SYMTAB) continue;
2931 IF_DEBUG(linker,debugBelch( "section %d is a symbol table\n", i ));
2933 stab = (Elf_Sym*) (ehdrC + shdr[i].sh_offset);
2934 nent = shdr[i].sh_size / sizeof(Elf_Sym);
2935 IF_DEBUG(linker,debugBelch( " number of entries is apparently %d (%ld rem)\n",
2937 (long)shdr[i].sh_size % sizeof(Elf_Sym)
2939 if (0 != shdr[i].sh_size % sizeof(Elf_Sym)) {
2940 errorBelch("%s: non-integral number of symbol table entries", oc->fileName);
2943 for (j = 0; j < nent; j++) {
2944 IF_DEBUG(linker,debugBelch(" %2d ", j ));
2945 IF_DEBUG(linker,debugBelch(" sec=%-5d size=%-3d val=%5p ",
2946 (int)stab[j].st_shndx,
2947 (int)stab[j].st_size,
2948 (char*)stab[j].st_value ));
2950 IF_DEBUG(linker,debugBelch("type=" ));
2951 switch (ELF_ST_TYPE(stab[j].st_info)) {
2952 case STT_NOTYPE: IF_DEBUG(linker,debugBelch("notype " )); break;
2953 case STT_OBJECT: IF_DEBUG(linker,debugBelch("object " )); break;
2954 case STT_FUNC : IF_DEBUG(linker,debugBelch("func " )); break;
2955 case STT_SECTION: IF_DEBUG(linker,debugBelch("section" )); break;
2956 case STT_FILE: IF_DEBUG(linker,debugBelch("file " )); break;
2957 default: IF_DEBUG(linker,debugBelch("? " )); break;
2959 IF_DEBUG(linker,debugBelch(" " ));
2961 IF_DEBUG(linker,debugBelch("bind=" ));
2962 switch (ELF_ST_BIND(stab[j].st_info)) {
2963 case STB_LOCAL : IF_DEBUG(linker,debugBelch("local " )); break;
2964 case STB_GLOBAL: IF_DEBUG(linker,debugBelch("global" )); break;
2965 case STB_WEAK : IF_DEBUG(linker,debugBelch("weak " )); break;
2966 default: IF_DEBUG(linker,debugBelch("? " )); break;
2968 IF_DEBUG(linker,debugBelch(" " ));
2970 IF_DEBUG(linker,debugBelch("name=%s\n", strtab + stab[j].st_name ));
2974 if (nsymtabs == 0) {
2975 errorBelch("%s: didn't find any symbol tables", oc->fileName);
2982 static int getSectionKind_ELF( Elf_Shdr *hdr, int *is_bss )
2986 if (hdr->sh_type == SHT_PROGBITS
2987 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_EXECINSTR)) {
2988 /* .text-style section */
2989 return SECTIONKIND_CODE_OR_RODATA;
2992 if (hdr->sh_type == SHT_PROGBITS
2993 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_WRITE)) {
2994 /* .data-style section */
2995 return SECTIONKIND_RWDATA;
2998 if (hdr->sh_type == SHT_PROGBITS
2999 && (hdr->sh_flags & SHF_ALLOC) && !(hdr->sh_flags & SHF_WRITE)) {
3000 /* .rodata-style section */
3001 return SECTIONKIND_CODE_OR_RODATA;
3004 if (hdr->sh_type == SHT_NOBITS
3005 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_WRITE)) {
3006 /* .bss-style section */
3008 return SECTIONKIND_RWDATA;
3011 return SECTIONKIND_OTHER;
3016 ocGetNames_ELF ( ObjectCode* oc )
3021 char* ehdrC = (char*)(oc->image);
3022 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
3023 char* strtab = findElfSection ( ehdrC, SHT_STRTAB );
3024 Elf_Shdr* shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
3026 ASSERT(symhash != NULL);
3029 errorBelch("%s: no strtab", oc->fileName);
3034 for (i = 0; i < ehdr->e_shnum; i++) {
3035 /* Figure out what kind of section it is. Logic derived from
3036 Figure 1.14 ("Special Sections") of the ELF document
3037 ("Portable Formats Specification, Version 1.1"). */
3039 SectionKind kind = getSectionKind_ELF(&shdr[i], &is_bss);
3041 if (is_bss && shdr[i].sh_size > 0) {
3042 /* This is a non-empty .bss section. Allocate zeroed space for
3043 it, and set its .sh_offset field such that
3044 ehdrC + .sh_offset == addr_of_zeroed_space. */
3045 char* zspace = stgCallocBytes(1, shdr[i].sh_size,
3046 "ocGetNames_ELF(BSS)");
3047 shdr[i].sh_offset = ((char*)zspace) - ((char*)ehdrC);
3049 debugBelch("BSS section at 0x%x, size %d\n",
3050 zspace, shdr[i].sh_size);
3054 /* fill in the section info */
3055 if (kind != SECTIONKIND_OTHER && shdr[i].sh_size > 0) {
3056 addProddableBlock(oc, ehdrC + shdr[i].sh_offset, shdr[i].sh_size);
3057 addSection(oc, kind, ehdrC + shdr[i].sh_offset,
3058 ehdrC + shdr[i].sh_offset + shdr[i].sh_size - 1);
3061 if (shdr[i].sh_type != SHT_SYMTAB) continue;
3063 /* copy stuff into this module's object symbol table */
3064 stab = (Elf_Sym*) (ehdrC + shdr[i].sh_offset);
3065 nent = shdr[i].sh_size / sizeof(Elf_Sym);
3067 oc->n_symbols = nent;
3068 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
3069 "ocGetNames_ELF(oc->symbols)");
3071 for (j = 0; j < nent; j++) {
3073 char isLocal = FALSE; /* avoids uninit-var warning */
3075 char* nm = strtab + stab[j].st_name;
3076 int secno = stab[j].st_shndx;
3078 /* Figure out if we want to add it; if so, set ad to its
3079 address. Otherwise leave ad == NULL. */
3081 if (secno == SHN_COMMON) {
3083 ad = stgCallocBytes(1, stab[j].st_size, "ocGetNames_ELF(COMMON)");
3085 debugBelch("COMMON symbol, size %d name %s\n",
3086 stab[j].st_size, nm);
3088 /* Pointless to do addProddableBlock() for this area,
3089 since the linker should never poke around in it. */
3092 if ( ( ELF_ST_BIND(stab[j].st_info)==STB_GLOBAL
3093 || ELF_ST_BIND(stab[j].st_info)==STB_LOCAL
3095 /* and not an undefined symbol */
3096 && stab[j].st_shndx != SHN_UNDEF
3097 /* and not in a "special section" */
3098 && stab[j].st_shndx < SHN_LORESERVE
3100 /* and it's a not a section or string table or anything silly */
3101 ( ELF_ST_TYPE(stab[j].st_info)==STT_FUNC ||
3102 ELF_ST_TYPE(stab[j].st_info)==STT_OBJECT ||
3103 ELF_ST_TYPE(stab[j].st_info)==STT_NOTYPE
3106 /* Section 0 is the undefined section, hence > and not >=. */
3107 ASSERT(secno > 0 && secno < ehdr->e_shnum);
3109 if (shdr[secno].sh_type == SHT_NOBITS) {
3110 debugBelch(" BSS symbol, size %d off %d name %s\n",
3111 stab[j].st_size, stab[j].st_value, nm);
3114 ad = ehdrC + shdr[ secno ].sh_offset + stab[j].st_value;
3115 if (ELF_ST_BIND(stab[j].st_info)==STB_LOCAL) {
3118 #ifdef ELF_FUNCTION_DESC
3119 /* dlsym() and the initialisation table both give us function
3120 * descriptors, so to be consistent we store function descriptors
3121 * in the symbol table */
3122 if (ELF_ST_TYPE(stab[j].st_info) == STT_FUNC)
3123 ad = (char *)allocateFunctionDesc((Elf_Addr)ad);
3125 IF_DEBUG(linker,debugBelch( "addOTabName(GLOB): %10p %s %s",
3126 ad, oc->fileName, nm ));
3131 /* And the decision is ... */
3135 oc->symbols[j] = nm;
3138 /* Ignore entirely. */
3140 ghciInsertStrHashTable(oc->fileName, symhash, nm, ad);
3144 IF_DEBUG(linker,debugBelch( "skipping `%s'\n",
3145 strtab + stab[j].st_name ));
3148 "skipping bind = %d, type = %d, shndx = %d `%s'\n",
3149 (int)ELF_ST_BIND(stab[j].st_info),
3150 (int)ELF_ST_TYPE(stab[j].st_info),
3151 (int)stab[j].st_shndx,
3152 strtab + stab[j].st_name
3155 oc->symbols[j] = NULL;
3164 /* Do ELF relocations which lack an explicit addend. All x86-linux
3165 relocations appear to be of this form. */
3167 do_Elf_Rel_relocations ( ObjectCode* oc, char* ehdrC,
3168 Elf_Shdr* shdr, int shnum,
3169 Elf_Sym* stab, char* strtab )
3174 Elf_Rel* rtab = (Elf_Rel*) (ehdrC + shdr[shnum].sh_offset);
3175 int nent = shdr[shnum].sh_size / sizeof(Elf_Rel);
3176 int target_shndx = shdr[shnum].sh_info;
3177 int symtab_shndx = shdr[shnum].sh_link;
3179 stab = (Elf_Sym*) (ehdrC + shdr[ symtab_shndx ].sh_offset);
3180 targ = (Elf_Word*)(ehdrC + shdr[ target_shndx ].sh_offset);
3181 IF_DEBUG(linker,debugBelch( "relocations for section %d using symtab %d\n",
3182 target_shndx, symtab_shndx ));
3184 /* Skip sections that we're not interested in. */
3187 SectionKind kind = getSectionKind_ELF(&shdr[target_shndx], &is_bss);
3188 if (kind == SECTIONKIND_OTHER) {
3189 IF_DEBUG(linker,debugBelch( "skipping (target section not loaded)"));
3194 for (j = 0; j < nent; j++) {
3195 Elf_Addr offset = rtab[j].r_offset;
3196 Elf_Addr info = rtab[j].r_info;
3198 Elf_Addr P = ((Elf_Addr)targ) + offset;
3199 Elf_Word* pP = (Elf_Word*)P;
3204 StgStablePtr stablePtr;
3207 IF_DEBUG(linker,debugBelch( "Rel entry %3d is raw(%6p %6p)",
3208 j, (void*)offset, (void*)info ));
3210 IF_DEBUG(linker,debugBelch( " ZERO" ));
3213 Elf_Sym sym = stab[ELF_R_SYM(info)];
3214 /* First see if it is a local symbol. */
3215 if (ELF_ST_BIND(sym.st_info) == STB_LOCAL) {
3216 /* Yes, so we can get the address directly from the ELF symbol
3218 symbol = sym.st_name==0 ? "(noname)" : strtab+sym.st_name;
3220 (ehdrC + shdr[ sym.st_shndx ].sh_offset
3221 + stab[ELF_R_SYM(info)].st_value);
3224 symbol = strtab + sym.st_name;
3225 stablePtr = (StgStablePtr)lookupHashTable(stablehash, (StgWord)symbol);
3226 if (NULL == stablePtr) {
3227 /* No, so look up the name in our global table. */
3228 S_tmp = lookupSymbol( symbol );
3229 S = (Elf_Addr)S_tmp;
3231 stableVal = deRefStablePtr( stablePtr );
3233 S = (Elf_Addr)S_tmp;
3237 errorBelch("%s: unknown symbol `%s'", oc->fileName, symbol);
3240 IF_DEBUG(linker,debugBelch( "`%s' resolves to %p\n", symbol, (void*)S ));
3243 IF_DEBUG(linker,debugBelch( "Reloc: P = %p S = %p A = %p\n",
3244 (void*)P, (void*)S, (void*)A ));
3245 checkProddableBlock ( oc, pP );
3249 switch (ELF_R_TYPE(info)) {
3250 # ifdef i386_HOST_ARCH
3251 case R_386_32: *pP = value; break;
3252 case R_386_PC32: *pP = value - P; break;
3255 errorBelch("%s: unhandled ELF relocation(Rel) type %lu\n",
3256 oc->fileName, (lnat)ELF_R_TYPE(info));
3264 /* Do ELF relocations for which explicit addends are supplied.
3265 sparc-solaris relocations appear to be of this form. */
3267 do_Elf_Rela_relocations ( ObjectCode* oc, char* ehdrC,
3268 Elf_Shdr* shdr, int shnum,
3269 Elf_Sym* stab, char* strtab )
3272 char *symbol = NULL;
3274 Elf_Rela* rtab = (Elf_Rela*) (ehdrC + shdr[shnum].sh_offset);
3275 int nent = shdr[shnum].sh_size / sizeof(Elf_Rela);
3276 int target_shndx = shdr[shnum].sh_info;
3277 int symtab_shndx = shdr[shnum].sh_link;
3279 stab = (Elf_Sym*) (ehdrC + shdr[ symtab_shndx ].sh_offset);
3280 targ = (Elf_Addr) (ehdrC + shdr[ target_shndx ].sh_offset);
3281 IF_DEBUG(linker,debugBelch( "relocations for section %d using symtab %d\n",
3282 target_shndx, symtab_shndx ));
3284 for (j = 0; j < nent; j++) {
3285 #if defined(DEBUG) || defined(sparc_HOST_ARCH) || defined(ia64_HOST_ARCH) || defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH)
3286 /* This #ifdef only serves to avoid unused-var warnings. */
3287 Elf_Addr offset = rtab[j].r_offset;
3288 Elf_Addr P = targ + offset;
3290 Elf_Addr info = rtab[j].r_info;
3291 Elf_Addr A = rtab[j].r_addend;
3295 # if defined(sparc_HOST_ARCH)
3296 Elf_Word* pP = (Elf_Word*)P;
3298 # elif defined(ia64_HOST_ARCH)
3299 Elf64_Xword *pP = (Elf64_Xword *)P;
3301 # elif defined(powerpc_HOST_ARCH)
3305 IF_DEBUG(linker,debugBelch( "Rel entry %3d is raw(%6p %6p %6p) ",
3306 j, (void*)offset, (void*)info,
3309 IF_DEBUG(linker,debugBelch( " ZERO" ));
3312 Elf_Sym sym = stab[ELF_R_SYM(info)];
3313 /* First see if it is a local symbol. */
3314 if (ELF_ST_BIND(sym.st_info) == STB_LOCAL) {
3315 /* Yes, so we can get the address directly from the ELF symbol
3317 symbol = sym.st_name==0 ? "(noname)" : strtab+sym.st_name;
3319 (ehdrC + shdr[ sym.st_shndx ].sh_offset
3320 + stab[ELF_R_SYM(info)].st_value);
3321 #ifdef ELF_FUNCTION_DESC
3322 /* Make a function descriptor for this function */
3323 if (S && ELF_ST_TYPE(sym.st_info) == STT_FUNC) {
3324 S = allocateFunctionDesc(S + A);
3329 /* No, so look up the name in our global table. */
3330 symbol = strtab + sym.st_name;
3331 S_tmp = lookupSymbol( symbol );
3332 S = (Elf_Addr)S_tmp;
3334 #ifdef ELF_FUNCTION_DESC
3335 /* If a function, already a function descriptor - we would
3336 have to copy it to add an offset. */
3337 if (S && (ELF_ST_TYPE(sym.st_info) == STT_FUNC) && (A != 0))
3338 errorBelch("%s: function %s with addend %p", oc->fileName, symbol, (void *)A);
3342 errorBelch("%s: unknown symbol `%s'", oc->fileName, symbol);
3345 IF_DEBUG(linker,debugBelch( "`%s' resolves to %p", symbol, (void*)S ));
3348 IF_DEBUG(linker,debugBelch("Reloc: P = %p S = %p A = %p\n",
3349 (void*)P, (void*)S, (void*)A ));
3350 /* checkProddableBlock ( oc, (void*)P ); */
3354 switch (ELF_R_TYPE(info)) {
3355 # if defined(sparc_HOST_ARCH)
3356 case R_SPARC_WDISP30:
3357 w1 = *pP & 0xC0000000;
3358 w2 = (Elf_Word)((value - P) >> 2);
3359 ASSERT((w2 & 0xC0000000) == 0);
3364 w1 = *pP & 0xFFC00000;
3365 w2 = (Elf_Word)(value >> 10);
3366 ASSERT((w2 & 0xFFC00000) == 0);
3372 w2 = (Elf_Word)(value & 0x3FF);
3373 ASSERT((w2 & ~0x3FF) == 0);
3377 /* According to the Sun documentation:
3379 This relocation type resembles R_SPARC_32, except it refers to an
3380 unaligned word. That is, the word to be relocated must be treated
3381 as four separate bytes with arbitrary alignment, not as a word
3382 aligned according to the architecture requirements.
3384 (JRS: which means that freeloading on the R_SPARC_32 case
3385 is probably wrong, but hey ...)
3389 w2 = (Elf_Word)value;
3392 # elif defined(ia64_HOST_ARCH)
3393 case R_IA64_DIR64LSB:
3394 case R_IA64_FPTR64LSB:
3397 case R_IA64_PCREL64LSB:
3400 case R_IA64_SEGREL64LSB:
3401 addr = findElfSegment(ehdrC, value);
3404 case R_IA64_GPREL22:
3405 ia64_reloc_gprel22(P, value);
3407 case R_IA64_LTOFF22:
3408 case R_IA64_LTOFF22X:
3409 case R_IA64_LTOFF_FPTR22:
3410 addr = allocateGOTEntry(value);
3411 ia64_reloc_gprel22(P, addr);
3413 case R_IA64_PCREL21B:
3414 ia64_reloc_pcrel21(P, S, oc);
3417 /* This goes with R_IA64_LTOFF22X and points to the load to
3418 * convert into a move. We don't implement relaxation. */
3420 # elif defined(powerpc_HOST_ARCH)
3421 case R_PPC_ADDR16_LO:
3422 *(Elf32_Half*) P = value;
3425 case R_PPC_ADDR16_HI:
3426 *(Elf32_Half*) P = value >> 16;
3429 case R_PPC_ADDR16_HA:
3430 *(Elf32_Half*) P = (value + 0x8000) >> 16;
3434 *(Elf32_Word *) P = value;
3438 *(Elf32_Word *) P = value - P;
3444 if( delta << 6 >> 6 != delta )
3446 value = (Elf_Addr) (&makeSymbolExtra( oc, ELF_R_SYM(info), value )
3450 if( value == 0 || delta << 6 >> 6 != delta )
3452 barf( "Unable to make SymbolExtra for #%d",
3458 *(Elf_Word *) P = (*(Elf_Word *) P & 0xfc000003)
3459 | (delta & 0x3fffffc);
3463 #if x86_64_HOST_ARCH
3465 *(Elf64_Xword *)P = value;
3470 StgInt64 off = value - P;
3471 if (off >= 0x7fffffffL || off < -0x80000000L) {
3472 barf("R_X86_64_PC32 relocation out of range: %s = %p",
3475 *(Elf64_Word *)P = (Elf64_Word)off;
3480 if (value >= 0x7fffffffL) {
3481 barf("R_X86_64_32 relocation out of range: %s = %p\n",
3484 *(Elf64_Word *)P = (Elf64_Word)value;
3488 if ((StgInt64)value > 0x7fffffffL || (StgInt64)value < -0x80000000L) {
3489 barf("R_X86_64_32S relocation out of range: %s = %p\n",
3492 *(Elf64_Sword *)P = (Elf64_Sword)value;
3497 errorBelch("%s: unhandled ELF relocation(RelA) type %lu\n",
3498 oc->fileName, (lnat)ELF_R_TYPE(info));
3507 ocResolve_ELF ( ObjectCode* oc )
3511 Elf_Sym* stab = NULL;
3512 char* ehdrC = (char*)(oc->image);
3513 Elf_Ehdr* ehdr = (Elf_Ehdr*) ehdrC;
3514 Elf_Shdr* shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
3516 /* first find "the" symbol table */
3517 stab = (Elf_Sym*) findElfSection ( ehdrC, SHT_SYMTAB );
3519 /* also go find the string table */
3520 strtab = findElfSection ( ehdrC, SHT_STRTAB );
3522 if (stab == NULL || strtab == NULL) {
3523 errorBelch("%s: can't find string or symbol table", oc->fileName);
3527 /* Process the relocation sections. */
3528 for (shnum = 0; shnum < ehdr->e_shnum; shnum++) {
3529 if (shdr[shnum].sh_type == SHT_REL) {
3530 ok = do_Elf_Rel_relocations ( oc, ehdrC, shdr,
3531 shnum, stab, strtab );
3535 if (shdr[shnum].sh_type == SHT_RELA) {
3536 ok = do_Elf_Rela_relocations ( oc, ehdrC, shdr,
3537 shnum, stab, strtab );
3542 /* Free the local symbol table; we won't need it again. */
3543 freeHashTable(oc->lochash, NULL);
3546 #if defined(powerpc_HOST_ARCH)
3547 ocFlushInstructionCache( oc );
3555 * Instructions are 41 bits long, packed into 128 bit bundles with a 5-bit template
3556 * at the front. The following utility functions pack and unpack instructions, and
3557 * take care of the most common relocations.
3560 #ifdef ia64_HOST_ARCH
3563 ia64_extract_instruction(Elf64_Xword *target)
3566 int slot = (Elf_Addr)target & 3;
3567 target = (Elf_Addr)target & ~3;
3575 return ((w1 >> 5) & 0x1ffffffffff);
3577 return (w1 >> 46) | ((w2 & 0x7fffff) << 18);
3581 barf("ia64_extract_instruction: invalid slot %p", target);
3586 ia64_deposit_instruction(Elf64_Xword *target, Elf64_Xword value)
3588 int slot = (Elf_Addr)target & 3;
3589 target = (Elf_Addr)target & ~3;
3594 *target |= value << 5;
3597 *target |= value << 46;
3598 *(target+1) |= value >> 18;
3601 *(target+1) |= value << 23;
3607 ia64_reloc_gprel22(Elf_Addr target, Elf_Addr value)
3609 Elf64_Xword instruction;
3610 Elf64_Sxword rel_value;
3612 rel_value = value - gp_val;
3613 if ((rel_value > 0x1fffff) || (rel_value < -0x1fffff))
3614 barf("GP-relative data out of range (address = 0x%lx, gp = 0x%lx)", value, gp_val);
3616 instruction = ia64_extract_instruction((Elf64_Xword *)target);
3617 instruction |= (((rel_value >> 0) & 0x07f) << 13) /* imm7b */
3618 | (((rel_value >> 7) & 0x1ff) << 27) /* imm9d */
3619 | (((rel_value >> 16) & 0x01f) << 22) /* imm5c */
3620 | ((Elf64_Xword)(rel_value < 0) << 36); /* s */
3621 ia64_deposit_instruction((Elf64_Xword *)target, instruction);
3625 ia64_reloc_pcrel21(Elf_Addr target, Elf_Addr value, ObjectCode *oc)
3627 Elf64_Xword instruction;
3628 Elf64_Sxword rel_value;
3631 entry = allocatePLTEntry(value, oc);
3633 rel_value = (entry >> 4) - (target >> 4);
3634 if ((rel_value > 0xfffff) || (rel_value < -0xfffff))
3635 barf("PLT entry too far away (entry = 0x%lx, target = 0x%lx)", entry, target);
3637 instruction = ia64_extract_instruction((Elf64_Xword *)target);
3638 instruction |= ((rel_value & 0xfffff) << 13) /* imm20b */
3639 | ((Elf64_Xword)(rel_value < 0) << 36); /* s */
3640 ia64_deposit_instruction((Elf64_Xword *)target, instruction);
3646 * PowerPC ELF specifics
3649 #ifdef powerpc_HOST_ARCH
3651 static int ocAllocateSymbolExtras_ELF( ObjectCode *oc )
3657 ehdr = (Elf_Ehdr *) oc->image;
3658 shdr = (Elf_Shdr *) ( ((char *)oc->image) + ehdr->e_shoff );
3660 for( i = 0; i < ehdr->e_shnum; i++ )
3661 if( shdr[i].sh_type == SHT_SYMTAB )
3664 if( i == ehdr->e_shnum )
3666 errorBelch( "This ELF file contains no symtab" );
3670 if( shdr[i].sh_entsize != sizeof( Elf_Sym ) )
3672 errorBelch( "The entry size (%d) of the symtab isn't %d\n",
3673 shdr[i].sh_entsize, sizeof( Elf_Sym ) );
3678 return ocAllocateSymbolExtras( oc, shdr[i].sh_size / sizeof( Elf_Sym ), 0 );
3681 #endif /* powerpc */
3685 /* --------------------------------------------------------------------------
3687 * ------------------------------------------------------------------------*/
3689 #if defined(OBJFORMAT_MACHO)
3692 Support for MachO linking on Darwin/MacOS X
3693 by Wolfgang Thaller (wolfgang.thaller@gmx.net)
3695 I hereby formally apologize for the hackish nature of this code.
3696 Things that need to be done:
3697 *) implement ocVerifyImage_MachO
3698 *) add still more sanity checks.
3701 #if x86_64_HOST_ARCH || powerpc64_HOST_ARCH
3702 #define mach_header mach_header_64
3703 #define segment_command segment_command_64
3704 #define section section_64
3705 #define nlist nlist_64
3708 #ifdef powerpc_HOST_ARCH
3709 static int ocAllocateSymbolExtras_MachO(ObjectCode* oc)
3711 struct mach_header *header = (struct mach_header *) oc->image;
3712 struct load_command *lc = (struct load_command *) (header + 1);
3715 for( i = 0; i < header->ncmds; i++ )
3717 if( lc->cmd == LC_SYMTAB )
3719 // Find out the first and last undefined external
3720 // symbol, so we don't have to allocate too many
3722 struct symtab_command *symLC = (struct symtab_command *) lc;
3723 unsigned min = symLC->nsyms, max = 0;
3724 struct nlist *nlist =
3725 symLC ? (struct nlist*) ((char*) oc->image + symLC->symoff)
3727 for(i=0;i<symLC->nsyms;i++)
3729 if(nlist[i].n_type & N_STAB)
3731 else if(nlist[i].n_type & N_EXT)
3733 if((nlist[i].n_type & N_TYPE) == N_UNDF
3734 && (nlist[i].n_value == 0))
3744 return ocAllocateSymbolExtras(oc, max - min + 1, min);
3749 lc = (struct load_command *) ( ((char *)lc) + lc->cmdsize );
3751 return ocAllocateSymbolExtras(oc,0,0);
3754 #ifdef x86_64_HOST_ARCH
3755 static int ocAllocateSymbolExtras_MachO(ObjectCode* oc)
3757 struct mach_header *header = (struct mach_header *) oc->image;
3758 struct load_command *lc = (struct load_command *) (header + 1);
3761 for( i = 0; i < header->ncmds; i++ )
3763 if( lc->cmd == LC_SYMTAB )
3765 // Just allocate one entry for every symbol
3766 struct symtab_command *symLC = (struct symtab_command *) lc;
3768 return ocAllocateSymbolExtras(oc, symLC->nsyms, 0);
3771 lc = (struct load_command *) ( ((char *)lc) + lc->cmdsize );
3773 return ocAllocateSymbolExtras(oc,0,0);
3777 static int ocVerifyImage_MachO(ObjectCode* oc)
3779 char *image = (char*) oc->image;
3780 struct mach_header *header = (struct mach_header*) image;
3782 #if x86_64_TARGET_ARCH || powerpc64_TARGET_ARCH
3783 if(header->magic != MH_MAGIC_64)
3786 if(header->magic != MH_MAGIC)
3789 // FIXME: do some more verifying here
3793 static int resolveImports(
3796 struct symtab_command *symLC,
3797 struct section *sect, // ptr to lazy or non-lazy symbol pointer section
3798 unsigned long *indirectSyms,
3799 struct nlist *nlist)
3802 size_t itemSize = 4;
3805 int isJumpTable = 0;
3806 if(!strcmp(sect->sectname,"__jump_table"))
3810 ASSERT(sect->reserved2 == itemSize);
3814 for(i=0; i*itemSize < sect->size;i++)
3816 // according to otool, reserved1 contains the first index into the indirect symbol table
3817 struct nlist *symbol = &nlist[indirectSyms[sect->reserved1+i]];
3818 char *nm = image + symLC->stroff + symbol->n_un.n_strx;
3821 if((symbol->n_type & N_TYPE) == N_UNDF
3822 && (symbol->n_type & N_EXT) && (symbol->n_value != 0))
3823 addr = (void*) (symbol->n_value);
3824 else if((addr = lookupLocalSymbol(oc,nm)) != NULL)
3827 addr = lookupSymbol(nm);
3830 errorBelch("\n%s: unknown symbol `%s'", oc->fileName, nm);
3838 checkProddableBlock(oc,image + sect->offset + i*itemSize);
3839 *(image + sect->offset + i*itemSize) = 0xe9; // jmp
3840 *(unsigned*)(image + sect->offset + i*itemSize + 1)
3841 = (char*)addr - (image + sect->offset + i*itemSize + 5);
3846 checkProddableBlock(oc,((void**)(image + sect->offset)) + i);
3847 ((void**)(image + sect->offset))[i] = addr;
3854 static unsigned long relocateAddress(
3857 struct section* sections,
3858 unsigned long address)
3861 for(i = 0; i < nSections; i++)
3863 if(sections[i].addr <= address
3864 && address < sections[i].addr + sections[i].size)
3866 return (unsigned long)oc->image
3867 + sections[i].offset + address - sections[i].addr;
3870 barf("Invalid Mach-O file:"
3871 "Address out of bounds while relocating object file");
3875 static int relocateSection(
3878 struct symtab_command *symLC, struct nlist *nlist,
3879 int nSections, struct section* sections, struct section *sect)
3881 struct relocation_info *relocs;
3884 if(!strcmp(sect->sectname,"__la_symbol_ptr"))
3886 else if(!strcmp(sect->sectname,"__nl_symbol_ptr"))
3888 else if(!strcmp(sect->sectname,"__la_sym_ptr2"))
3890 else if(!strcmp(sect->sectname,"__la_sym_ptr3"))
3894 relocs = (struct relocation_info*) (image + sect->reloff);
3898 #ifdef x86_64_HOST_ARCH
3899 struct relocation_info *reloc = &relocs[i];
3901 char *thingPtr = image + sect->offset + reloc->r_address;
3905 int type = reloc->r_type;
3907 checkProddableBlock(oc,thingPtr);
3908 switch(reloc->r_length)
3911 thing = *(uint8_t*)thingPtr;
3912 baseValue = (uint64_t)thingPtr + 1;
3915 thing = *(uint16_t*)thingPtr;
3916 baseValue = (uint64_t)thingPtr + 2;
3919 thing = *(uint32_t*)thingPtr;
3920 baseValue = (uint64_t)thingPtr + 4;
3923 thing = *(uint64_t*)thingPtr;
3924 baseValue = (uint64_t)thingPtr + 8;
3927 barf("Unknown size.");
3930 if(type == X86_64_RELOC_GOT
3931 || type == X86_64_RELOC_GOT_LOAD)
3933 ASSERT(reloc->r_extern);
3934 value = (uint64_t) &makeSymbolExtra(oc, reloc->r_symbolnum, value)->addr;
3936 type = X86_64_RELOC_SIGNED;
3938 else if(reloc->r_extern)
3940 struct nlist *symbol = &nlist[reloc->r_symbolnum];
3941 char *nm = image + symLC->stroff + symbol->n_un.n_strx;
3942 if(symbol->n_value == 0)
3943 value = (uint64_t) lookupSymbol(nm);
3945 value = relocateAddress(oc, nSections, sections,
3950 value = sections[reloc->r_symbolnum-1].offset
3951 - sections[reloc->r_symbolnum-1].addr
3955 if(type == X86_64_RELOC_BRANCH)
3957 if((int32_t)(value - baseValue) != (int64_t)(value - baseValue))
3959 ASSERT(reloc->r_extern);
3960 value = (uint64_t) &makeSymbolExtra(oc, reloc->r_symbolnum, value)
3963 ASSERT((int32_t)(value - baseValue) == (int64_t)(value - baseValue));
3964 type = X86_64_RELOC_SIGNED;
3969 case X86_64_RELOC_UNSIGNED:
3970 ASSERT(!reloc->r_pcrel);
3973 case X86_64_RELOC_SIGNED:
3974 ASSERT(reloc->r_pcrel);
3975 thing += value - baseValue;
3977 case X86_64_RELOC_SUBTRACTOR:
3978 ASSERT(!reloc->r_pcrel);
3982 barf("unkown relocation");
3985 switch(reloc->r_length)
3988 *(uint8_t*)thingPtr = thing;
3991 *(uint16_t*)thingPtr = thing;
3994 *(uint32_t*)thingPtr = thing;
3997 *(uint64_t*)thingPtr = thing;
4001 if(relocs[i].r_address & R_SCATTERED)
4003 struct scattered_relocation_info *scat =
4004 (struct scattered_relocation_info*) &relocs[i];
4008 if(scat->r_length == 2)
4010 unsigned long word = 0;
4011 unsigned long* wordPtr = (unsigned long*) (image + sect->offset + scat->r_address);
4012 checkProddableBlock(oc,wordPtr);
4014 // Note on relocation types:
4015 // i386 uses the GENERIC_RELOC_* types,
4016 // while ppc uses special PPC_RELOC_* types.
4017 // *_RELOC_VANILLA and *_RELOC_PAIR have the same value
4018 // in both cases, all others are different.
4019 // Therefore, we use GENERIC_RELOC_VANILLA
4020 // and GENERIC_RELOC_PAIR instead of the PPC variants,
4021 // and use #ifdefs for the other types.
4023 // Step 1: Figure out what the relocated value should be
4024 if(scat->r_type == GENERIC_RELOC_VANILLA)
4026 word = *wordPtr + (unsigned long) relocateAddress(
4033 #ifdef powerpc_HOST_ARCH
4034 else if(scat->r_type == PPC_RELOC_SECTDIFF
4035 || scat->r_type == PPC_RELOC_LO16_SECTDIFF
4036 || scat->r_type == PPC_RELOC_HI16_SECTDIFF
4037 || scat->r_type == PPC_RELOC_HA16_SECTDIFF)
4039 else if(scat->r_type == GENERIC_RELOC_SECTDIFF)
4042 struct scattered_relocation_info *pair =
4043 (struct scattered_relocation_info*) &relocs[i+1];
4045 if(!pair->r_scattered || pair->r_type != GENERIC_RELOC_PAIR)
4046 barf("Invalid Mach-O file: "
4047 "RELOC_*_SECTDIFF not followed by RELOC_PAIR");
4049 word = (unsigned long)
4050 (relocateAddress(oc, nSections, sections, scat->r_value)
4051 - relocateAddress(oc, nSections, sections, pair->r_value));
4054 #ifdef powerpc_HOST_ARCH
4055 else if(scat->r_type == PPC_RELOC_HI16
4056 || scat->r_type == PPC_RELOC_LO16
4057 || scat->r_type == PPC_RELOC_HA16
4058 || scat->r_type == PPC_RELOC_LO14)
4059 { // these are generated by label+offset things
4060 struct relocation_info *pair = &relocs[i+1];
4061 if((pair->r_address & R_SCATTERED) || pair->r_type != PPC_RELOC_PAIR)
4062 barf("Invalid Mach-O file: "
4063 "PPC_RELOC_* not followed by PPC_RELOC_PAIR");
4065 if(scat->r_type == PPC_RELOC_LO16)
4067 word = ((unsigned short*) wordPtr)[1];
4068 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
4070 else if(scat->r_type == PPC_RELOC_LO14)
4072 barf("Unsupported Relocation: PPC_RELOC_LO14");
4073 word = ((unsigned short*) wordPtr)[1] & 0xFFFC;
4074 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
4076 else if(scat->r_type == PPC_RELOC_HI16)
4078 word = ((unsigned short*) wordPtr)[1] << 16;
4079 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF);
4081 else if(scat->r_type == PPC_RELOC_HA16)
4083 word = ((unsigned short*) wordPtr)[1] << 16;
4084 word += ((short)relocs[i+1].r_address & (short)0xFFFF);
4088 word += (unsigned long) relocateAddress(oc, nSections, sections, scat->r_value)
4095 continue; // ignore the others
4097 #ifdef powerpc_HOST_ARCH
4098 if(scat->r_type == GENERIC_RELOC_VANILLA
4099 || scat->r_type == PPC_RELOC_SECTDIFF)
4101 if(scat->r_type == GENERIC_RELOC_VANILLA
4102 || scat->r_type == GENERIC_RELOC_SECTDIFF)
4107 #ifdef powerpc_HOST_ARCH
4108 else if(scat->r_type == PPC_RELOC_LO16_SECTDIFF || scat->r_type == PPC_RELOC_LO16)
4110 ((unsigned short*) wordPtr)[1] = word & 0xFFFF;
4112 else if(scat->r_type == PPC_RELOC_HI16_SECTDIFF || scat->r_type == PPC_RELOC_HI16)
4114 ((unsigned short*) wordPtr)[1] = (word >> 16) & 0xFFFF;
4116 else if(scat->r_type == PPC_RELOC_HA16_SECTDIFF || scat->r_type == PPC_RELOC_HA16)
4118 ((unsigned short*) wordPtr)[1] = ((word >> 16) & 0xFFFF)
4119 + ((word & (1<<15)) ? 1 : 0);
4125 continue; // FIXME: I hope it's OK to ignore all the others.
4129 struct relocation_info *reloc = &relocs[i];
4130 if(reloc->r_pcrel && !reloc->r_extern)
4133 if(reloc->r_length == 2)
4135 unsigned long word = 0;
4136 #ifdef powerpc_HOST_ARCH
4137 unsigned long jumpIsland = 0;
4138 long offsetToJumpIsland = 0xBADBAD42; // initialise to bad value
4139 // to avoid warning and to catch
4143 unsigned long* wordPtr = (unsigned long*) (image + sect->offset + reloc->r_address);
4144 checkProddableBlock(oc,wordPtr);
4146 if(reloc->r_type == GENERIC_RELOC_VANILLA)
4150 #ifdef powerpc_HOST_ARCH
4151 else if(reloc->r_type == PPC_RELOC_LO16)
4153 word = ((unsigned short*) wordPtr)[1];
4154 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
4156 else if(reloc->r_type == PPC_RELOC_HI16)
4158 word = ((unsigned short*) wordPtr)[1] << 16;
4159 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF);
4161 else if(reloc->r_type == PPC_RELOC_HA16)
4163 word = ((unsigned short*) wordPtr)[1] << 16;
4164 word += ((short)relocs[i+1].r_address & (short)0xFFFF);
4166 else if(reloc->r_type == PPC_RELOC_BR24)
4169 word = (word & 0x03FFFFFC) | ((word & 0x02000000) ? 0xFC000000 : 0);
4173 if(!reloc->r_extern)
4176 sections[reloc->r_symbolnum-1].offset
4177 - sections[reloc->r_symbolnum-1].addr
4184 struct nlist *symbol = &nlist[reloc->r_symbolnum];
4185 char *nm = image + symLC->stroff + symbol->n_un.n_strx;
4186 void *symbolAddress = lookupSymbol(nm);
4189 errorBelch("\nunknown symbol `%s'", nm);
4195 #ifdef powerpc_HOST_ARCH
4196 // In the .o file, this should be a relative jump to NULL
4197 // and we'll change it to a relative jump to the symbol
4198 ASSERT(-word == reloc->r_address);
4199 jumpIsland = (unsigned long)
4200 &makeSymbolExtra(oc,
4202 (unsigned long) symbolAddress)
4206 offsetToJumpIsland = word + jumpIsland
4207 - (((long)image) + sect->offset - sect->addr);
4210 word += (unsigned long) symbolAddress
4211 - (((long)image) + sect->offset - sect->addr);
4215 word += (unsigned long) symbolAddress;
4219 if(reloc->r_type == GENERIC_RELOC_VANILLA)
4224 #ifdef powerpc_HOST_ARCH
4225 else if(reloc->r_type == PPC_RELOC_LO16)
4227 ((unsigned short*) wordPtr)[1] = word & 0xFFFF;
4230 else if(reloc->r_type == PPC_RELOC_HI16)
4232 ((unsigned short*) wordPtr)[1] = (word >> 16) & 0xFFFF;
4235 else if(reloc->r_type == PPC_RELOC_HA16)
4237 ((unsigned short*) wordPtr)[1] = ((word >> 16) & 0xFFFF)
4238 + ((word & (1<<15)) ? 1 : 0);
4241 else if(reloc->r_type == PPC_RELOC_BR24)
4243 if((long)word > (long)0x01FFFFFF || (long)word < (long)0xFFE00000)
4245 // The branch offset is too large.
4246 // Therefore, we try to use a jump island.
4249 barf("unconditional relative branch out of range: "
4250 "no jump island available");
4253 word = offsetToJumpIsland;
4254 if((long)word > (long)0x01FFFFFF || (long)word < (long)0xFFE00000)
4255 barf("unconditional relative branch out of range: "
4256 "jump island out of range");
4258 *wordPtr = (*wordPtr & 0xFC000003) | (word & 0x03FFFFFC);
4263 barf("\nunknown relocation %d",reloc->r_type);
4271 static int ocGetNames_MachO(ObjectCode* oc)
4273 char *image = (char*) oc->image;
4274 struct mach_header *header = (struct mach_header*) image;
4275 struct load_command *lc = (struct load_command*) (image + sizeof(struct mach_header));
4276 unsigned i,curSymbol = 0;
4277 struct segment_command *segLC = NULL;
4278 struct section *sections;
4279 struct symtab_command *symLC = NULL;
4280 struct nlist *nlist;
4281 unsigned long commonSize = 0;
4282 char *commonStorage = NULL;
4283 unsigned long commonCounter;
4285 for(i=0;i<header->ncmds;i++)
4287 if(lc->cmd == LC_SEGMENT || lc->cmd == LC_SEGMENT_64)
4288 segLC = (struct segment_command*) lc;
4289 else if(lc->cmd == LC_SYMTAB)
4290 symLC = (struct symtab_command*) lc;
4291 lc = (struct load_command *) ( ((char*)lc) + lc->cmdsize );
4294 sections = (struct section*) (segLC+1);
4295 nlist = symLC ? (struct nlist*) (image + symLC->symoff)
4299 barf("ocGetNames_MachO: no segment load command");
4301 for(i=0;i<segLC->nsects;i++)
4303 if(sections[i].size == 0)
4306 if((sections[i].flags & SECTION_TYPE) == S_ZEROFILL)
4308 char * zeroFillArea = stgCallocBytes(1,sections[i].size,
4309 "ocGetNames_MachO(common symbols)");
4310 sections[i].offset = zeroFillArea - image;
4313 if(!strcmp(sections[i].sectname,"__text"))
4314 addSection(oc, SECTIONKIND_CODE_OR_RODATA,
4315 (void*) (image + sections[i].offset),
4316 (void*) (image + sections[i].offset + sections[i].size));
4317 else if(!strcmp(sections[i].sectname,"__const"))
4318 addSection(oc, SECTIONKIND_RWDATA,
4319 (void*) (image + sections[i].offset),
4320 (void*) (image + sections[i].offset + sections[i].size));
4321 else if(!strcmp(sections[i].sectname,"__data"))
4322 addSection(oc, SECTIONKIND_RWDATA,
4323 (void*) (image + sections[i].offset),
4324 (void*) (image + sections[i].offset + sections[i].size));
4325 else if(!strcmp(sections[i].sectname,"__bss")
4326 || !strcmp(sections[i].sectname,"__common"))
4327 addSection(oc, SECTIONKIND_RWDATA,
4328 (void*) (image + sections[i].offset),
4329 (void*) (image + sections[i].offset + sections[i].size));
4331 addProddableBlock(oc, (void*) (image + sections[i].offset),
4335 // count external symbols defined here
4339 for(i=0;i<symLC->nsyms;i++)
4341 if(nlist[i].n_type & N_STAB)
4343 else if(nlist[i].n_type & N_EXT)
4345 if((nlist[i].n_type & N_TYPE) == N_UNDF
4346 && (nlist[i].n_value != 0))
4348 commonSize += nlist[i].n_value;
4351 else if((nlist[i].n_type & N_TYPE) == N_SECT)
4356 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
4357 "ocGetNames_MachO(oc->symbols)");
4361 for(i=0;i<symLC->nsyms;i++)
4363 if(nlist[i].n_type & N_STAB)
4365 else if((nlist[i].n_type & N_TYPE) == N_SECT)
4367 if(nlist[i].n_type & N_EXT)
4369 char *nm = image + symLC->stroff + nlist[i].n_un.n_strx;
4370 if((nlist[i].n_desc & N_WEAK_DEF) && lookupSymbol(nm))
4371 ; // weak definition, and we already have a definition
4374 ghciInsertStrHashTable(oc->fileName, symhash, nm,
4376 + sections[nlist[i].n_sect-1].offset
4377 - sections[nlist[i].n_sect-1].addr
4378 + nlist[i].n_value);
4379 oc->symbols[curSymbol++] = nm;
4386 commonStorage = stgCallocBytes(1,commonSize,"ocGetNames_MachO(common symbols)");
4387 commonCounter = (unsigned long)commonStorage;
4390 for(i=0;i<symLC->nsyms;i++)
4392 if((nlist[i].n_type & N_TYPE) == N_UNDF
4393 && (nlist[i].n_type & N_EXT) && (nlist[i].n_value != 0))
4395 char *nm = image + symLC->stroff + nlist[i].n_un.n_strx;
4396 unsigned long sz = nlist[i].n_value;
4398 nlist[i].n_value = commonCounter;
4400 ghciInsertStrHashTable(oc->fileName, symhash, nm,
4401 (void*)commonCounter);
4402 oc->symbols[curSymbol++] = nm;
4404 commonCounter += sz;
4411 static int ocResolve_MachO(ObjectCode* oc)
4413 char *image = (char*) oc->image;
4414 struct mach_header *header = (struct mach_header*) image;
4415 struct load_command *lc = (struct load_command*) (image + sizeof(struct mach_header));
4417 struct segment_command *segLC = NULL;
4418 struct section *sections;
4419 struct symtab_command *symLC = NULL;
4420 struct dysymtab_command *dsymLC = NULL;
4421 struct nlist *nlist;
4423 for(i=0;i<header->ncmds;i++)
4425 if(lc->cmd == LC_SEGMENT || lc->cmd == LC_SEGMENT_64)
4426 segLC = (struct segment_command*) lc;
4427 else if(lc->cmd == LC_SYMTAB)
4428 symLC = (struct symtab_command*) lc;
4429 else if(lc->cmd == LC_DYSYMTAB)
4430 dsymLC = (struct dysymtab_command*) lc;
4431 lc = (struct load_command *) ( ((char*)lc) + lc->cmdsize );
4434 sections = (struct section*) (segLC+1);
4435 nlist = symLC ? (struct nlist*) (image + symLC->symoff)
4440 unsigned long *indirectSyms
4441 = (unsigned long*) (image + dsymLC->indirectsymoff);
4443 for(i=0;i<segLC->nsects;i++)
4445 if( !strcmp(sections[i].sectname,"__la_symbol_ptr")
4446 || !strcmp(sections[i].sectname,"__la_sym_ptr2")
4447 || !strcmp(sections[i].sectname,"__la_sym_ptr3"))
4449 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4452 else if(!strcmp(sections[i].sectname,"__nl_symbol_ptr")
4453 || !strcmp(sections[i].sectname,"__pointers"))
4455 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4458 else if(!strcmp(sections[i].sectname,"__jump_table"))
4460 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4466 for(i=0;i<segLC->nsects;i++)
4468 if(!relocateSection(oc,image,symLC,nlist,segLC->nsects,sections,§ions[i]))
4472 /* Free the local symbol table; we won't need it again. */
4473 freeHashTable(oc->lochash, NULL);
4476 #if defined (powerpc_HOST_ARCH)
4477 ocFlushInstructionCache( oc );
4483 #ifdef powerpc_HOST_ARCH
4485 * The Mach-O object format uses leading underscores. But not everywhere.
4486 * There is a small number of runtime support functions defined in
4487 * libcc_dynamic.a whose name does not have a leading underscore.
4488 * As a consequence, we can't get their address from C code.
4489 * We have to use inline assembler just to take the address of a function.
4493 static void machoInitSymbolsWithoutUnderscore()
4495 extern void* symbolsWithoutUnderscore[];
4496 void **p = symbolsWithoutUnderscore;
4497 __asm__ volatile(".globl _symbolsWithoutUnderscore\n.data\n_symbolsWithoutUnderscore:");
4501 __asm__ volatile(".long " # x);
4503 RTS_MACHO_NOUNDERLINE_SYMBOLS
4505 __asm__ volatile(".text");
4509 ghciInsertStrHashTable("(GHCi built-in symbols)", symhash, #x, *p++);
4511 RTS_MACHO_NOUNDERLINE_SYMBOLS
4518 * Figure out by how much to shift the entire Mach-O file in memory
4519 * when loading so that its single segment ends up 16-byte-aligned
4521 static int machoGetMisalignment( FILE * f )
4523 struct mach_header header;
4526 fread(&header, sizeof(header), 1, f);
4529 #if x86_64_TARGET_ARCH || powerpc64_TARGET_ARCH
4530 if(header.magic != MH_MAGIC_64)
4533 if(header.magic != MH_MAGIC)
4537 misalignment = (header.sizeofcmds + sizeof(header))
4540 return misalignment ? (16 - misalignment) : 0;