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) \
531 SymX(hs_perform_gc) \
532 SymX(hs_free_stable_ptr) \
533 SymX(hs_free_fun_ptr) \
535 SymX(unpackClosurezh_fast) \
536 SymX(getApStackValzh_fast) \
537 SymX(int2Integerzh_fast) \
538 SymX(integer2Intzh_fast) \
539 SymX(integer2Wordzh_fast) \
540 SymX(isCurrentThreadBoundzh_fast) \
541 SymX(isDoubleDenormalized) \
542 SymX(isDoubleInfinite) \
544 SymX(isDoubleNegativeZero) \
545 SymX(isEmptyMVarzh_fast) \
546 SymX(isFloatDenormalized) \
547 SymX(isFloatInfinite) \
549 SymX(isFloatNegativeZero) \
550 SymX(killThreadzh_fast) \
552 SymX(insertStableSymbol) \
555 SymX(makeStablePtrzh_fast) \
556 SymX(minusIntegerzh_fast) \
557 SymX(mkApUpd0zh_fast) \
558 SymX(myThreadIdzh_fast) \
559 SymX(labelThreadzh_fast) \
560 SymX(newArrayzh_fast) \
561 SymX(newBCOzh_fast) \
562 SymX(newByteArrayzh_fast) \
563 SymX_redirect(newCAF, newDynCAF) \
564 SymX(newMVarzh_fast) \
565 SymX(newMutVarzh_fast) \
566 SymX(newTVarzh_fast) \
567 SymX(noDuplicatezh_fast) \
568 SymX(atomicModifyMutVarzh_fast) \
569 SymX(newPinnedByteArrayzh_fast) \
571 SymX(orIntegerzh_fast) \
573 SymX(performMajorGC) \
574 SymX(plusIntegerzh_fast) \
577 SymX(putMVarzh_fast) \
578 SymX(quotIntegerzh_fast) \
579 SymX(quotRemIntegerzh_fast) \
581 SymX(raiseIOzh_fast) \
582 SymX(readTVarzh_fast) \
583 SymX(remIntegerzh_fast) \
584 SymX(resetNonBlockingFd) \
589 SymX(rts_checkSchedStatus) \
592 SymX(rts_evalLazyIO) \
593 SymX(rts_evalStableIO) \
597 SymX(rts_getDouble) \
602 SymX(rts_getFunPtr) \
603 SymX(rts_getStablePtr) \
604 SymX(rts_getThreadId) \
606 SymX(rts_getWord32) \
619 SymX(rts_mkStablePtr) \
627 SymX(rtsSupportsBoundThreads) \
628 SymX(__hscore_get_saved_termios) \
629 SymX(__hscore_set_saved_termios) \
631 SymX(startupHaskell) \
632 SymX(shutdownHaskell) \
633 SymX(shutdownHaskellAndExit) \
634 SymX(stable_ptr_table) \
635 SymX(stackOverflow) \
636 SymX(stg_CAF_BLACKHOLE_info) \
637 SymX(awakenBlockedQueue) \
638 SymX(stg_CHARLIKE_closure) \
639 SymX(stg_EMPTY_MVAR_info) \
640 SymX(stg_IND_STATIC_info) \
641 SymX(stg_INTLIKE_closure) \
642 SymX(stg_MUT_ARR_PTRS_DIRTY_info) \
643 SymX(stg_MUT_ARR_PTRS_FROZEN_info) \
644 SymX(stg_MUT_ARR_PTRS_FROZEN0_info) \
645 SymX(stg_WEAK_info) \
646 SymX(stg_ap_v_info) \
647 SymX(stg_ap_f_info) \
648 SymX(stg_ap_d_info) \
649 SymX(stg_ap_l_info) \
650 SymX(stg_ap_n_info) \
651 SymX(stg_ap_p_info) \
652 SymX(stg_ap_pv_info) \
653 SymX(stg_ap_pp_info) \
654 SymX(stg_ap_ppv_info) \
655 SymX(stg_ap_ppp_info) \
656 SymX(stg_ap_pppv_info) \
657 SymX(stg_ap_pppp_info) \
658 SymX(stg_ap_ppppp_info) \
659 SymX(stg_ap_pppppp_info) \
660 SymX(stg_ap_0_fast) \
661 SymX(stg_ap_v_fast) \
662 SymX(stg_ap_f_fast) \
663 SymX(stg_ap_d_fast) \
664 SymX(stg_ap_l_fast) \
665 SymX(stg_ap_n_fast) \
666 SymX(stg_ap_p_fast) \
667 SymX(stg_ap_pv_fast) \
668 SymX(stg_ap_pp_fast) \
669 SymX(stg_ap_ppv_fast) \
670 SymX(stg_ap_ppp_fast) \
671 SymX(stg_ap_pppv_fast) \
672 SymX(stg_ap_pppp_fast) \
673 SymX(stg_ap_ppppp_fast) \
674 SymX(stg_ap_pppppp_fast) \
675 SymX(stg_ap_1_upd_info) \
676 SymX(stg_ap_2_upd_info) \
677 SymX(stg_ap_3_upd_info) \
678 SymX(stg_ap_4_upd_info) \
679 SymX(stg_ap_5_upd_info) \
680 SymX(stg_ap_6_upd_info) \
681 SymX(stg_ap_7_upd_info) \
683 SymX(stg_sel_0_upd_info) \
684 SymX(stg_sel_10_upd_info) \
685 SymX(stg_sel_11_upd_info) \
686 SymX(stg_sel_12_upd_info) \
687 SymX(stg_sel_13_upd_info) \
688 SymX(stg_sel_14_upd_info) \
689 SymX(stg_sel_15_upd_info) \
690 SymX(stg_sel_1_upd_info) \
691 SymX(stg_sel_2_upd_info) \
692 SymX(stg_sel_3_upd_info) \
693 SymX(stg_sel_4_upd_info) \
694 SymX(stg_sel_5_upd_info) \
695 SymX(stg_sel_6_upd_info) \
696 SymX(stg_sel_7_upd_info) \
697 SymX(stg_sel_8_upd_info) \
698 SymX(stg_sel_9_upd_info) \
699 SymX(stg_upd_frame_info) \
700 SymX(suspendThread) \
701 SymX(takeMVarzh_fast) \
702 SymX(timesIntegerzh_fast) \
703 SymX(tryPutMVarzh_fast) \
704 SymX(tryTakeMVarzh_fast) \
705 SymX(unblockAsyncExceptionszh_fast) \
707 SymX(unsafeThawArrayzh_fast) \
708 SymX(waitReadzh_fast) \
709 SymX(waitWritezh_fast) \
710 SymX(word2Integerzh_fast) \
711 SymX(writeTVarzh_fast) \
712 SymX(xorIntegerzh_fast) \
714 SymX(stg_interp_constr_entry) \
717 SymX(getAllocations) \
720 SymX(rts_breakpoint_io_action) \
721 RTS_USER_SIGNALS_SYMBOLS
723 #ifdef SUPPORT_LONG_LONGS
724 #define RTS_LONG_LONG_SYMS \
725 SymX(int64ToIntegerzh_fast) \
726 SymX(word64ToIntegerzh_fast)
728 #define RTS_LONG_LONG_SYMS /* nothing */
731 // 64-bit support functions in libgcc.a
732 #if defined(__GNUC__) && SIZEOF_VOID_P <= 4
733 #define RTS_LIBGCC_SYMBOLS \
743 #elif defined(ia64_HOST_ARCH)
744 #define RTS_LIBGCC_SYMBOLS \
752 #define RTS_LIBGCC_SYMBOLS
755 #if defined(darwin_HOST_OS) && defined(powerpc_HOST_ARCH)
756 // Symbols that don't have a leading underscore
757 // on Mac OS X. They have to receive special treatment,
758 // see machoInitSymbolsWithoutUnderscore()
759 #define RTS_MACHO_NOUNDERLINE_SYMBOLS \
764 /* entirely bogus claims about types of these symbols */
765 #define Sym(vvv) extern void vvv(void);
766 #define SymX(vvv) /**/
767 #define SymX_redirect(vvv,xxx) /**/
771 RTS_POSIX_ONLY_SYMBOLS
772 RTS_MINGW_ONLY_SYMBOLS
773 RTS_CYGWIN_ONLY_SYMBOLS
774 RTS_DARWIN_ONLY_SYMBOLS
780 #ifdef LEADING_UNDERSCORE
781 #define MAYBE_LEADING_UNDERSCORE_STR(s) ("_" s)
783 #define MAYBE_LEADING_UNDERSCORE_STR(s) (s)
786 #define Sym(vvv) { MAYBE_LEADING_UNDERSCORE_STR(#vvv), \
788 #define SymX(vvv) Sym(vvv)
790 // SymX_redirect allows us to redirect references to one symbol to
791 // another symbol. See newCAF/newDynCAF for an example.
792 #define SymX_redirect(vvv,xxx) \
793 { MAYBE_LEADING_UNDERSCORE_STR(#vvv), \
796 static RtsSymbolVal rtsSyms[] = {
800 RTS_POSIX_ONLY_SYMBOLS
801 RTS_MINGW_ONLY_SYMBOLS
802 RTS_CYGWIN_ONLY_SYMBOLS
803 RTS_DARWIN_ONLY_SYMBOLS
805 #if defined(darwin_HOST_OS) && defined(i386_HOST_ARCH)
806 // dyld stub code contains references to this,
807 // but it should never be called because we treat
808 // lazy pointers as nonlazy.
809 { "dyld_stub_binding_helper", (void*)0xDEADBEEF },
811 { 0, 0 } /* sentinel */
816 /* -----------------------------------------------------------------------------
817 * Insert symbols into hash tables, checking for duplicates.
820 static void ghciInsertStrHashTable ( char* obj_name,
826 if (lookupHashTable(table, (StgWord)key) == NULL)
828 insertStrHashTable(table, (StgWord)key, data);
833 "GHCi runtime linker: fatal error: I found a duplicate definition for symbol\n"
835 "whilst processing object file\n"
837 "This could be caused by:\n"
838 " * Loading two different object files which export the same symbol\n"
839 " * Specifying the same object file twice on the GHCi command line\n"
840 " * An incorrect `package.conf' entry, causing some object to be\n"
842 "GHCi cannot safely continue in this situation. Exiting now. Sorry.\n"
849 /* -----------------------------------------------------------------------------
850 * initialize the object linker
854 static int linker_init_done = 0 ;
856 #if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
857 static void *dl_prog_handle;
865 /* Make initLinker idempotent, so we can call it
866 before evey relevant operation; that means we
867 don't need to initialise the linker separately */
868 if (linker_init_done == 1) { return; } else {
869 linker_init_done = 1;
872 stablehash = allocStrHashTable();
873 symhash = allocStrHashTable();
875 /* populate the symbol table with stuff from the RTS */
876 for (sym = rtsSyms; sym->lbl != NULL; sym++) {
877 ghciInsertStrHashTable("(GHCi built-in symbols)",
878 symhash, sym->lbl, sym->addr);
880 # if defined(OBJFORMAT_MACHO) && defined(powerpc_HOST_ARCH)
881 machoInitSymbolsWithoutUnderscore();
884 # if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
885 # if defined(RTLD_DEFAULT)
886 dl_prog_handle = RTLD_DEFAULT;
888 dl_prog_handle = dlopen(NULL, RTLD_LAZY);
889 # endif /* RTLD_DEFAULT */
893 /* -----------------------------------------------------------------------------
894 * Loading DLL or .so dynamic libraries
895 * -----------------------------------------------------------------------------
897 * Add a DLL from which symbols may be found. In the ELF case, just
898 * do RTLD_GLOBAL-style add, so no further messing around needs to
899 * happen in order that symbols in the loaded .so are findable --
900 * lookupSymbol() will subsequently see them by dlsym on the program's
901 * dl-handle. Returns NULL if success, otherwise ptr to an err msg.
903 * In the PEi386 case, open the DLLs and put handles to them in a
904 * linked list. When looking for a symbol, try all handles in the
905 * list. This means that we need to load even DLLs that are guaranteed
906 * to be in the ghc.exe image already, just so we can get a handle
907 * to give to loadSymbol, so that we can find the symbols. For such
908 * libraries, the LoadLibrary call should be a no-op except for returning
913 #if defined(OBJFORMAT_PEi386)
914 /* A record for storing handles into DLLs. */
919 struct _OpenedDLL* next;
924 /* A list thereof. */
925 static OpenedDLL* opened_dlls = NULL;
929 addDLL( char *dll_name )
931 # if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
932 /* ------------------- ELF DLL loader ------------------- */
938 hdl= dlopen(dll_name, RTLD_NOW | RTLD_GLOBAL);
941 /* dlopen failed; return a ptr to the error msg. */
943 if (errmsg == NULL) errmsg = "addDLL: unknown error";
950 # elif defined(OBJFORMAT_PEi386)
951 /* ------------------- Win32 DLL loader ------------------- */
959 /* debugBelch("\naddDLL; dll_name = `%s'\n", dll_name); */
961 /* See if we've already got it, and ignore if so. */
962 for (o_dll = opened_dlls; o_dll != NULL; o_dll = o_dll->next) {
963 if (0 == strcmp(o_dll->name, dll_name))
967 /* The file name has no suffix (yet) so that we can try
968 both foo.dll and foo.drv
970 The documentation for LoadLibrary says:
971 If no file name extension is specified in the lpFileName
972 parameter, the default library extension .dll is
973 appended. However, the file name string can include a trailing
974 point character (.) to indicate that the module name has no
977 buf = stgMallocBytes(strlen(dll_name) + 10, "addDLL");
978 sprintf(buf, "%s.DLL", dll_name);
979 instance = LoadLibrary(buf);
980 if (instance == NULL) {
981 sprintf(buf, "%s.DRV", dll_name); // KAA: allow loading of drivers (like winspool.drv)
982 instance = LoadLibrary(buf);
983 if (instance == NULL) {
986 /* LoadLibrary failed; return a ptr to the error msg. */
987 return "addDLL: unknown error";
992 /* Add this DLL to the list of DLLs in which to search for symbols. */
993 o_dll = stgMallocBytes( sizeof(OpenedDLL), "addDLL" );
994 o_dll->name = stgMallocBytes(1+strlen(dll_name), "addDLL");
995 strcpy(o_dll->name, dll_name);
996 o_dll->instance = instance;
997 o_dll->next = opened_dlls;
1002 barf("addDLL: not implemented on this platform");
1006 /* -----------------------------------------------------------------------------
1007 * insert a stable symbol in the hash table
1011 insertStableSymbol(char* obj_name, char* key, StgPtr p)
1013 ghciInsertStrHashTable(obj_name, stablehash, key, getStablePtr(p));
1017 /* -----------------------------------------------------------------------------
1018 * insert a symbol in the hash table
1021 insertSymbol(char* obj_name, char* key, void* data)
1023 ghciInsertStrHashTable(obj_name, symhash, key, data);
1026 /* -----------------------------------------------------------------------------
1027 * lookup a symbol in the hash table
1030 lookupSymbol( char *lbl )
1034 ASSERT(symhash != NULL);
1035 val = lookupStrHashTable(symhash, lbl);
1038 # if defined(OBJFORMAT_ELF)
1039 # if defined(x86_64_HOST_ARCH)
1040 val = dlsym(dl_prog_handle, lbl);
1041 if (val >= (void *)0x80000000) {
1043 new_val = x86_64_high_symbol(lbl, val);
1044 IF_DEBUG(linker,debugBelch("lookupSymbol: relocating out of range symbol: %s = %p, now %p\n", lbl, val, new_val));
1050 return dlsym(dl_prog_handle, lbl);
1052 # elif defined(OBJFORMAT_MACHO)
1053 if(NSIsSymbolNameDefined(lbl)) {
1054 NSSymbol symbol = NSLookupAndBindSymbol(lbl);
1055 return NSAddressOfSymbol(symbol);
1059 # elif defined(OBJFORMAT_PEi386)
1062 for (o_dll = opened_dlls; o_dll != NULL; o_dll = o_dll->next) {
1063 /* debugBelch("look in %s for %s\n", o_dll->name, lbl); */
1064 if (lbl[0] == '_') {
1065 /* HACK: if the name has an initial underscore, try stripping
1066 it off & look that up first. I've yet to verify whether there's
1067 a Rule that governs whether an initial '_' *should always* be
1068 stripped off when mapping from import lib name to the DLL name.
1070 sym = GetProcAddress(o_dll->instance, (lbl+1));
1072 /*debugBelch("found %s in %s\n", lbl+1,o_dll->name);*/
1076 sym = GetProcAddress(o_dll->instance, lbl);
1078 /*debugBelch("found %s in %s\n", lbl,o_dll->name);*/
1093 __attribute((unused))
1095 lookupLocalSymbol( ObjectCode* oc, char *lbl )
1099 val = lookupStrHashTable(oc->lochash, lbl);
1109 /* -----------------------------------------------------------------------------
1110 * Debugging aid: look in GHCi's object symbol tables for symbols
1111 * within DELTA bytes of the specified address, and show their names.
1114 void ghci_enquire ( char* addr );
1116 void ghci_enquire ( char* addr )
1121 const int DELTA = 64;
1126 for (oc = objects; oc; oc = oc->next) {
1127 for (i = 0; i < oc->n_symbols; i++) {
1128 sym = oc->symbols[i];
1129 if (sym == NULL) continue;
1130 // debugBelch("enquire %p %p\n", sym, oc->lochash);
1132 if (oc->lochash != NULL) {
1133 a = lookupStrHashTable(oc->lochash, sym);
1136 a = lookupStrHashTable(symhash, sym);
1139 // debugBelch("ghci_enquire: can't find %s\n", sym);
1141 else if (addr-DELTA <= a && a <= addr+DELTA) {
1142 debugBelch("%p + %3d == `%s'\n", addr, (int)(a - addr), sym);
1149 #ifdef ia64_HOST_ARCH
1150 static unsigned int PLTSize(void);
1153 /* -----------------------------------------------------------------------------
1154 * Load an obj (populate the global symbol table, but don't resolve yet)
1156 * Returns: 1 if ok, 0 on error.
1159 loadObj( char *path )
1166 void *map_addr = NULL;
1172 /* debugBelch("loadObj %s\n", path ); */
1174 /* Check that we haven't already loaded this object.
1175 Ignore requests to load multiple times */
1179 for (o = objects; o; o = o->next) {
1180 if (0 == strcmp(o->fileName, path)) {
1182 break; /* don't need to search further */
1186 IF_DEBUG(linker, debugBelch(
1187 "GHCi runtime linker: warning: looks like you're trying to load the\n"
1188 "same object file twice:\n"
1190 "GHCi will ignore this, but be warned.\n"
1192 return 1; /* success */
1196 oc = stgMallocBytes(sizeof(ObjectCode), "loadObj(oc)");
1198 # if defined(OBJFORMAT_ELF)
1199 oc->formatName = "ELF";
1200 # elif defined(OBJFORMAT_PEi386)
1201 oc->formatName = "PEi386";
1202 # elif defined(OBJFORMAT_MACHO)
1203 oc->formatName = "Mach-O";
1206 barf("loadObj: not implemented on this platform");
1209 r = stat(path, &st);
1210 if (r == -1) { return 0; }
1212 /* sigh, strdup() isn't a POSIX function, so do it the long way */
1213 oc->fileName = stgMallocBytes( strlen(path)+1, "loadObj" );
1214 strcpy(oc->fileName, path);
1216 oc->fileSize = st.st_size;
1218 oc->sections = NULL;
1219 oc->lochash = allocStrHashTable();
1220 oc->proddables = NULL;
1222 /* chain it onto the list of objects */
1227 #define ROUND_UP(x,size) ((x + size - 1) & ~(size - 1))
1229 /* On many architectures malloc'd memory isn't executable, so we need to use mmap. */
1231 #if defined(openbsd_HOST_OS)
1232 fd = open(path, O_RDONLY, S_IRUSR);
1234 fd = open(path, O_RDONLY);
1237 barf("loadObj: can't open `%s'", path);
1239 pagesize = getpagesize();
1241 #ifdef ia64_HOST_ARCH
1242 /* The PLT needs to be right before the object */
1243 n = ROUND_UP(PLTSize(), pagesize);
1244 oc->plt = mmap(NULL, n, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
1245 if (oc->plt == MAP_FAILED)
1246 barf("loadObj: can't allocate PLT");
1249 map_addr = oc->plt + n;
1252 n = ROUND_UP(oc->fileSize, pagesize);
1254 /* Link objects into the lower 2Gb on x86_64. GHC assumes the
1255 * small memory model on this architecture (see gcc docs,
1258 #ifdef x86_64_HOST_ARCH
1259 #define EXTRA_MAP_FLAGS MAP_32BIT
1261 #define EXTRA_MAP_FLAGS 0
1264 oc->image = mmap(map_addr, n, PROT_EXEC|PROT_READ|PROT_WRITE,
1265 MAP_PRIVATE|EXTRA_MAP_FLAGS, fd, 0);
1266 if (oc->image == MAP_FAILED)
1267 barf("loadObj: can't map `%s'", path);
1271 #else /* !USE_MMAP */
1273 /* load the image into memory */
1274 f = fopen(path, "rb");
1276 barf("loadObj: can't read `%s'", path);
1278 # if defined(mingw32_HOST_OS)
1279 // TODO: We would like to use allocateExec here, but allocateExec
1280 // cannot currently allocate blocks large enough.
1281 oc->image = VirtualAlloc(NULL, oc->fileSize, MEM_RESERVE | MEM_COMMIT,
1282 PAGE_EXECUTE_READWRITE);
1283 # elif defined(darwin_HOST_OS)
1284 // In a Mach-O .o file, all sections can and will be misaligned
1285 // if the total size of the headers is not a multiple of the
1286 // desired alignment. This is fine for .o files that only serve
1287 // as input for the static linker, but it's not fine for us,
1288 // as SSE (used by gcc for floating point) and Altivec require
1289 // 16-byte alignment.
1290 // We calculate the correct alignment from the header before
1291 // reading the file, and then we misalign oc->image on purpose so
1292 // that the actual sections end up aligned again.
1293 oc->misalignment = machoGetMisalignment(f);
1294 oc->image = stgMallocBytes(oc->fileSize + oc->misalignment, "loadObj(image)");
1295 oc->image += oc->misalignment;
1297 oc->image = stgMallocBytes(oc->fileSize, "loadObj(image)");
1300 n = fread ( oc->image, 1, oc->fileSize, f );
1301 if (n != oc->fileSize)
1302 barf("loadObj: error whilst reading `%s'", path);
1305 #endif /* USE_MMAP */
1307 # if defined(OBJFORMAT_MACHO) && (defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH))
1308 r = ocAllocateSymbolExtras_MachO ( oc );
1309 if (!r) { return r; }
1310 # elif defined(OBJFORMAT_ELF) && defined(powerpc_HOST_ARCH)
1311 r = ocAllocateSymbolExtras_ELF ( oc );
1312 if (!r) { return r; }
1315 /* verify the in-memory image */
1316 # if defined(OBJFORMAT_ELF)
1317 r = ocVerifyImage_ELF ( oc );
1318 # elif defined(OBJFORMAT_PEi386)
1319 r = ocVerifyImage_PEi386 ( oc );
1320 # elif defined(OBJFORMAT_MACHO)
1321 r = ocVerifyImage_MachO ( oc );
1323 barf("loadObj: no verify method");
1325 if (!r) { return r; }
1327 /* build the symbol list for this image */
1328 # if defined(OBJFORMAT_ELF)
1329 r = ocGetNames_ELF ( oc );
1330 # elif defined(OBJFORMAT_PEi386)
1331 r = ocGetNames_PEi386 ( oc );
1332 # elif defined(OBJFORMAT_MACHO)
1333 r = ocGetNames_MachO ( oc );
1335 barf("loadObj: no getNames method");
1337 if (!r) { return r; }
1339 /* loaded, but not resolved yet */
1340 oc->status = OBJECT_LOADED;
1345 /* -----------------------------------------------------------------------------
1346 * resolve all the currently unlinked objects in memory
1348 * Returns: 1 if ok, 0 on error.
1358 for (oc = objects; oc; oc = oc->next) {
1359 if (oc->status != OBJECT_RESOLVED) {
1360 # if defined(OBJFORMAT_ELF)
1361 r = ocResolve_ELF ( oc );
1362 # elif defined(OBJFORMAT_PEi386)
1363 r = ocResolve_PEi386 ( oc );
1364 # elif defined(OBJFORMAT_MACHO)
1365 r = ocResolve_MachO ( oc );
1367 barf("resolveObjs: not implemented on this platform");
1369 if (!r) { return r; }
1370 oc->status = OBJECT_RESOLVED;
1376 /* -----------------------------------------------------------------------------
1377 * delete an object from the pool
1380 unloadObj( char *path )
1382 ObjectCode *oc, *prev;
1384 ASSERT(symhash != NULL);
1385 ASSERT(objects != NULL);
1390 for (oc = objects; oc; prev = oc, oc = oc->next) {
1391 if (!strcmp(oc->fileName,path)) {
1393 /* Remove all the mappings for the symbols within this
1398 for (i = 0; i < oc->n_symbols; i++) {
1399 if (oc->symbols[i] != NULL) {
1400 removeStrHashTable(symhash, oc->symbols[i], NULL);
1408 prev->next = oc->next;
1411 // We're going to leave this in place, in case there are
1412 // any pointers from the heap into it:
1413 // #ifdef mingw32_HOST_OS
1414 // VirtualFree(oc->image);
1416 // stgFree(oc->image);
1418 stgFree(oc->fileName);
1419 stgFree(oc->symbols);
1420 stgFree(oc->sections);
1421 /* The local hash table should have been freed at the end
1422 of the ocResolve_ call on it. */
1423 ASSERT(oc->lochash == NULL);
1429 errorBelch("unloadObj: can't find `%s' to unload", path);
1433 /* -----------------------------------------------------------------------------
1434 * Sanity checking. For each ObjectCode, maintain a list of address ranges
1435 * which may be prodded during relocation, and abort if we try and write
1436 * outside any of these.
1438 static void addProddableBlock ( ObjectCode* oc, void* start, int size )
1441 = stgMallocBytes(sizeof(ProddableBlock), "addProddableBlock");
1442 /* debugBelch("aPB %p %p %d\n", oc, start, size); */
1446 pb->next = oc->proddables;
1447 oc->proddables = pb;
1450 static void checkProddableBlock ( ObjectCode* oc, void* addr )
1453 for (pb = oc->proddables; pb != NULL; pb = pb->next) {
1454 char* s = (char*)(pb->start);
1455 char* e = s + pb->size - 1;
1456 char* a = (char*)addr;
1457 /* Assumes that the biggest fixup involves a 4-byte write. This
1458 probably needs to be changed to 8 (ie, +7) on 64-bit
1460 if (a >= s && (a+3) <= e) return;
1462 barf("checkProddableBlock: invalid fixup in runtime linker");
1465 /* -----------------------------------------------------------------------------
1466 * Section management.
1468 static void addSection ( ObjectCode* oc, SectionKind kind,
1469 void* start, void* end )
1471 Section* s = stgMallocBytes(sizeof(Section), "addSection");
1475 s->next = oc->sections;
1478 debugBelch("addSection: %p-%p (size %d), kind %d\n",
1479 start, ((char*)end)-1, end - start + 1, kind );
1484 /* --------------------------------------------------------------------------
1486 * This is about allocating a small chunk of memory for every symbol in the
1487 * object file. We make sure that the SymboLExtras are always "in range" of
1488 * limited-range PC-relative instructions on various platforms by allocating
1489 * them right next to the object code itself.
1492 #if defined(powerpc_HOST_ARCH) || (defined(x86_64_HOST_ARCH) \
1493 && defined(darwin_TARGET_OS))
1496 ocAllocateSymbolExtras
1498 Allocate additional space at the end of the object file image to make room
1499 for jump islands (powerpc, x86_64) and GOT entries (x86_64).
1501 PowerPC relative branch instructions have a 24 bit displacement field.
1502 As PPC code is always 4-byte-aligned, this yields a +-32MB range.
1503 If a particular imported symbol is outside this range, we have to redirect
1504 the jump to a short piece of new code that just loads the 32bit absolute
1505 address and jumps there.
1506 On x86_64, PC-relative jumps and PC-relative accesses to the GOT are limited
1509 This function just allocates space for one SymbolExtra for every
1510 undefined symbol in the object file. The code for the jump islands is
1511 filled in by makeSymbolExtra below.
1514 static int ocAllocateSymbolExtras( ObjectCode* oc, int count, int first )
1520 int misalignment = 0;
1522 misalignment = oc->misalignment;
1527 // round up to the nearest 4
1528 aligned = (oc->fileSize + 3) & ~3;
1531 #ifndef linux_HOST_OS /* mremap is a linux extension */
1532 #error ocAllocateSymbolExtras doesnt want USE_MMAP to be defined
1535 pagesize = getpagesize();
1536 n = ROUND_UP( oc->fileSize, pagesize );
1537 m = ROUND_UP( aligned + sizeof (SymbolExtra) * count, pagesize );
1539 /* If we have a half-page-size file and map one page of it then
1540 * the part of the page after the size of the file remains accessible.
1541 * If, however, we map in 2 pages, the 2nd page is not accessible
1542 * and will give a "Bus Error" on access. To get around this, we check
1543 * if we need any extra pages for the jump islands and map them in
1544 * anonymously. We must check that we actually require extra pages
1545 * otherwise the attempt to mmap 0 pages of anonymous memory will
1551 /* The effect of this mremap() call is only the ensure that we have
1552 * a sufficient number of virtually contiguous pages. As returned from
1553 * mremap, the pages past the end of the file are not backed. We give
1554 * them a backing by using MAP_FIXED to map in anonymous pages.
1556 oc->image = mremap( oc->image, n, m, MREMAP_MAYMOVE );
1558 if( oc->image == MAP_FAILED )
1560 errorBelch( "Unable to mremap for Jump Islands\n" );
1564 if( mmap( oc->image + n, m - n, PROT_READ | PROT_WRITE | PROT_EXEC,
1565 MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED, 0, 0 ) == MAP_FAILED )
1567 errorBelch( "Unable to mmap( MAP_FIXED ) for Jump Islands\n" );
1573 oc->image -= misalignment;
1574 oc->image = stgReallocBytes( oc->image,
1576 aligned + sizeof (SymbolExtra) * count,
1577 "ocAllocateSymbolExtras" );
1578 oc->image += misalignment;
1579 #endif /* USE_MMAP */
1581 oc->symbol_extras = (SymbolExtra *) (oc->image + aligned);
1582 memset( oc->symbol_extras, 0, sizeof (SymbolExtra) * count );
1585 oc->symbol_extras = NULL;
1587 oc->first_symbol_extra = first;
1588 oc->n_symbol_extras = count;
1593 static SymbolExtra* makeSymbolExtra( ObjectCode* oc,
1594 unsigned long symbolNumber,
1595 unsigned long target )
1599 ASSERT( symbolNumber >= oc->first_symbol_extra
1600 && symbolNumber - oc->first_symbol_extra < oc->n_symbol_extras);
1602 extra = &oc->symbol_extras[symbolNumber - oc->first_symbol_extra];
1604 #ifdef powerpc_HOST_ARCH
1605 // lis r12, hi16(target)
1606 extra->jumpIsland.lis_r12 = 0x3d80;
1607 extra->jumpIsland.hi_addr = target >> 16;
1609 // ori r12, r12, lo16(target)
1610 extra->jumpIsland.ori_r12_r12 = 0x618c;
1611 extra->jumpIsland.lo_addr = target & 0xffff;
1614 extra->jumpIsland.mtctr_r12 = 0x7d8903a6;
1617 extra->jumpIsland.bctr = 0x4e800420;
1619 #ifdef x86_64_HOST_ARCH
1621 static uint8_t jmp[] = { 0xFF, 0x25, 0xF2, 0xFF, 0xFF, 0xFF };
1622 extra->addr = target;
1623 memcpy(extra->jumpIsland, jmp, 6);
1631 /* --------------------------------------------------------------------------
1632 * PowerPC specifics (instruction cache flushing)
1633 * ------------------------------------------------------------------------*/
1635 #ifdef powerpc_TARGET_ARCH
1637 ocFlushInstructionCache
1639 Flush the data & instruction caches.
1640 Because the PPC has split data/instruction caches, we have to
1641 do that whenever we modify code at runtime.
1644 static void ocFlushInstructionCache( ObjectCode *oc )
1646 int n = (oc->fileSize + sizeof( SymbolExtra ) * oc->n_symbol_extras + 3) / 4;
1647 unsigned long *p = (unsigned long *) oc->image;
1651 __asm__ volatile ( "dcbf 0,%0\n\t"
1659 __asm__ volatile ( "sync\n\t"
1665 /* --------------------------------------------------------------------------
1666 * PEi386 specifics (Win32 targets)
1667 * ------------------------------------------------------------------------*/
1669 /* The information for this linker comes from
1670 Microsoft Portable Executable
1671 and Common Object File Format Specification
1672 revision 5.1 January 1998
1673 which SimonM says comes from the MS Developer Network CDs.
1675 It can be found there (on older CDs), but can also be found
1678 http://www.microsoft.com/hwdev/hardware/PECOFF.asp
1680 (this is Rev 6.0 from February 1999).
1682 Things move, so if that fails, try searching for it via
1684 http://www.google.com/search?q=PE+COFF+specification
1686 The ultimate reference for the PE format is the Winnt.h
1687 header file that comes with the Platform SDKs; as always,
1688 implementations will drift wrt their documentation.
1690 A good background article on the PE format is Matt Pietrek's
1691 March 1994 article in Microsoft System Journal (MSJ)
1692 (Vol.9, No. 3): "Peering Inside the PE: A Tour of the
1693 Win32 Portable Executable File Format." The info in there
1694 has recently been updated in a two part article in
1695 MSDN magazine, issues Feb and March 2002,
1696 "Inside Windows: An In-Depth Look into the Win32 Portable
1697 Executable File Format"
1699 John Levine's book "Linkers and Loaders" contains useful
1704 #if defined(OBJFORMAT_PEi386)
1708 typedef unsigned char UChar;
1709 typedef unsigned short UInt16;
1710 typedef unsigned int UInt32;
1717 UInt16 NumberOfSections;
1718 UInt32 TimeDateStamp;
1719 UInt32 PointerToSymbolTable;
1720 UInt32 NumberOfSymbols;
1721 UInt16 SizeOfOptionalHeader;
1722 UInt16 Characteristics;
1726 #define sizeof_COFF_header 20
1733 UInt32 VirtualAddress;
1734 UInt32 SizeOfRawData;
1735 UInt32 PointerToRawData;
1736 UInt32 PointerToRelocations;
1737 UInt32 PointerToLinenumbers;
1738 UInt16 NumberOfRelocations;
1739 UInt16 NumberOfLineNumbers;
1740 UInt32 Characteristics;
1744 #define sizeof_COFF_section 40
1751 UInt16 SectionNumber;
1754 UChar NumberOfAuxSymbols;
1758 #define sizeof_COFF_symbol 18
1763 UInt32 VirtualAddress;
1764 UInt32 SymbolTableIndex;
1769 #define sizeof_COFF_reloc 10
1772 /* From PE spec doc, section 3.3.2 */
1773 /* Note use of MYIMAGE_* since IMAGE_* are already defined in
1774 windows.h -- for the same purpose, but I want to know what I'm
1776 #define MYIMAGE_FILE_RELOCS_STRIPPED 0x0001
1777 #define MYIMAGE_FILE_EXECUTABLE_IMAGE 0x0002
1778 #define MYIMAGE_FILE_DLL 0x2000
1779 #define MYIMAGE_FILE_SYSTEM 0x1000
1780 #define MYIMAGE_FILE_BYTES_REVERSED_HI 0x8000
1781 #define MYIMAGE_FILE_BYTES_REVERSED_LO 0x0080
1782 #define MYIMAGE_FILE_32BIT_MACHINE 0x0100
1784 /* From PE spec doc, section 5.4.2 and 5.4.4 */
1785 #define MYIMAGE_SYM_CLASS_EXTERNAL 2
1786 #define MYIMAGE_SYM_CLASS_STATIC 3
1787 #define MYIMAGE_SYM_UNDEFINED 0
1789 /* From PE spec doc, section 4.1 */
1790 #define MYIMAGE_SCN_CNT_CODE 0x00000020
1791 #define MYIMAGE_SCN_CNT_INITIALIZED_DATA 0x00000040
1792 #define MYIMAGE_SCN_LNK_NRELOC_OVFL 0x01000000
1794 /* From PE spec doc, section 5.2.1 */
1795 #define MYIMAGE_REL_I386_DIR32 0x0006
1796 #define MYIMAGE_REL_I386_REL32 0x0014
1799 /* We use myindex to calculate array addresses, rather than
1800 simply doing the normal subscript thing. That's because
1801 some of the above structs have sizes which are not
1802 a whole number of words. GCC rounds their sizes up to a
1803 whole number of words, which means that the address calcs
1804 arising from using normal C indexing or pointer arithmetic
1805 are just plain wrong. Sigh.
1808 myindex ( int scale, void* base, int index )
1811 ((UChar*)base) + scale * index;
1816 printName ( UChar* name, UChar* strtab )
1818 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
1819 UInt32 strtab_offset = * (UInt32*)(name+4);
1820 debugBelch("%s", strtab + strtab_offset );
1823 for (i = 0; i < 8; i++) {
1824 if (name[i] == 0) break;
1825 debugBelch("%c", name[i] );
1832 copyName ( UChar* name, UChar* strtab, UChar* dst, int dstSize )
1834 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
1835 UInt32 strtab_offset = * (UInt32*)(name+4);
1836 strncpy ( dst, strtab+strtab_offset, dstSize );
1842 if (name[i] == 0) break;
1852 cstring_from_COFF_symbol_name ( UChar* name, UChar* strtab )
1855 /* If the string is longer than 8 bytes, look in the
1856 string table for it -- this will be correctly zero terminated.
1858 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
1859 UInt32 strtab_offset = * (UInt32*)(name+4);
1860 return ((UChar*)strtab) + strtab_offset;
1862 /* Otherwise, if shorter than 8 bytes, return the original,
1863 which by defn is correctly terminated.
1865 if (name[7]==0) return name;
1866 /* The annoying case: 8 bytes. Copy into a temporary
1867 (which is never freed ...)
1869 newstr = stgMallocBytes(9, "cstring_from_COFF_symbol_name");
1871 strncpy(newstr,name,8);
1877 /* Just compares the short names (first 8 chars) */
1878 static COFF_section *
1879 findPEi386SectionCalled ( ObjectCode* oc, char* name )
1883 = (COFF_header*)(oc->image);
1884 COFF_section* sectab
1886 ((UChar*)(oc->image))
1887 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
1889 for (i = 0; i < hdr->NumberOfSections; i++) {
1892 COFF_section* section_i
1894 myindex ( sizeof_COFF_section, sectab, i );
1895 n1 = (UChar*) &(section_i->Name);
1897 if (n1[0]==n2[0] && n1[1]==n2[1] && n1[2]==n2[2] &&
1898 n1[3]==n2[3] && n1[4]==n2[4] && n1[5]==n2[5] &&
1899 n1[6]==n2[6] && n1[7]==n2[7])
1908 zapTrailingAtSign ( UChar* sym )
1910 # define my_isdigit(c) ((c) >= '0' && (c) <= '9')
1912 if (sym[0] == 0) return;
1914 while (sym[i] != 0) i++;
1917 while (j > 0 && my_isdigit(sym[j])) j--;
1918 if (j > 0 && sym[j] == '@' && j != i) sym[j] = 0;
1924 ocVerifyImage_PEi386 ( ObjectCode* oc )
1929 COFF_section* sectab;
1930 COFF_symbol* symtab;
1932 /* debugBelch("\nLOADING %s\n", oc->fileName); */
1933 hdr = (COFF_header*)(oc->image);
1934 sectab = (COFF_section*) (
1935 ((UChar*)(oc->image))
1936 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
1938 symtab = (COFF_symbol*) (
1939 ((UChar*)(oc->image))
1940 + hdr->PointerToSymbolTable
1942 strtab = ((UChar*)symtab)
1943 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
1945 if (hdr->Machine != 0x14c) {
1946 errorBelch("%s: Not x86 PEi386", oc->fileName);
1949 if (hdr->SizeOfOptionalHeader != 0) {
1950 errorBelch("%s: PEi386 with nonempty optional header", oc->fileName);
1953 if ( /* (hdr->Characteristics & MYIMAGE_FILE_RELOCS_STRIPPED) || */
1954 (hdr->Characteristics & MYIMAGE_FILE_EXECUTABLE_IMAGE) ||
1955 (hdr->Characteristics & MYIMAGE_FILE_DLL) ||
1956 (hdr->Characteristics & MYIMAGE_FILE_SYSTEM) ) {
1957 errorBelch("%s: Not a PEi386 object file", oc->fileName);
1960 if ( (hdr->Characteristics & MYIMAGE_FILE_BYTES_REVERSED_HI)
1961 /* || !(hdr->Characteristics & MYIMAGE_FILE_32BIT_MACHINE) */ ) {
1962 errorBelch("%s: Invalid PEi386 word size or endiannness: %d",
1964 (int)(hdr->Characteristics));
1967 /* If the string table size is way crazy, this might indicate that
1968 there are more than 64k relocations, despite claims to the
1969 contrary. Hence this test. */
1970 /* debugBelch("strtab size %d\n", * (UInt32*)strtab); */
1972 if ( (*(UInt32*)strtab) > 600000 ) {
1973 /* Note that 600k has no special significance other than being
1974 big enough to handle the almost-2MB-sized lumps that
1975 constitute HSwin32*.o. */
1976 debugBelch("PEi386 object has suspiciously large string table; > 64k relocs?");
1981 /* No further verification after this point; only debug printing. */
1983 IF_DEBUG(linker, i=1);
1984 if (i == 0) return 1;
1986 debugBelch( "sectab offset = %d\n", ((UChar*)sectab) - ((UChar*)hdr) );
1987 debugBelch( "symtab offset = %d\n", ((UChar*)symtab) - ((UChar*)hdr) );
1988 debugBelch( "strtab offset = %d\n", ((UChar*)strtab) - ((UChar*)hdr) );
1991 debugBelch( "Machine: 0x%x\n", (UInt32)(hdr->Machine) );
1992 debugBelch( "# sections: %d\n", (UInt32)(hdr->NumberOfSections) );
1993 debugBelch( "time/date: 0x%x\n", (UInt32)(hdr->TimeDateStamp) );
1994 debugBelch( "symtab offset: %d\n", (UInt32)(hdr->PointerToSymbolTable) );
1995 debugBelch( "# symbols: %d\n", (UInt32)(hdr->NumberOfSymbols) );
1996 debugBelch( "sz of opt hdr: %d\n", (UInt32)(hdr->SizeOfOptionalHeader) );
1997 debugBelch( "characteristics: 0x%x\n", (UInt32)(hdr->Characteristics) );
1999 /* Print the section table. */
2001 for (i = 0; i < hdr->NumberOfSections; i++) {
2003 COFF_section* sectab_i
2005 myindex ( sizeof_COFF_section, sectab, i );
2012 printName ( sectab_i->Name, strtab );
2022 sectab_i->VirtualSize,
2023 sectab_i->VirtualAddress,
2024 sectab_i->SizeOfRawData,
2025 sectab_i->PointerToRawData,
2026 sectab_i->NumberOfRelocations,
2027 sectab_i->PointerToRelocations,
2028 sectab_i->PointerToRawData
2030 reltab = (COFF_reloc*) (
2031 ((UChar*)(oc->image)) + sectab_i->PointerToRelocations
2034 if ( sectab_i->Characteristics & MYIMAGE_SCN_LNK_NRELOC_OVFL ) {
2035 /* If the relocation field (a short) has overflowed, the
2036 * real count can be found in the first reloc entry.
2038 * See Section 4.1 (last para) of the PE spec (rev6.0).
2040 COFF_reloc* rel = (COFF_reloc*)
2041 myindex ( sizeof_COFF_reloc, reltab, 0 );
2042 noRelocs = rel->VirtualAddress;
2045 noRelocs = sectab_i->NumberOfRelocations;
2049 for (; j < noRelocs; j++) {
2051 COFF_reloc* rel = (COFF_reloc*)
2052 myindex ( sizeof_COFF_reloc, reltab, j );
2054 " type 0x%-4x vaddr 0x%-8x name `",
2056 rel->VirtualAddress );
2057 sym = (COFF_symbol*)
2058 myindex ( sizeof_COFF_symbol, symtab, rel->SymbolTableIndex );
2059 /* Hmm..mysterious looking offset - what's it for? SOF */
2060 printName ( sym->Name, strtab -10 );
2067 debugBelch("string table has size 0x%x\n", * (UInt32*)strtab );
2068 debugBelch("---START of string table---\n");
2069 for (i = 4; i < *(Int32*)strtab; i++) {
2071 debugBelch("\n"); else
2072 debugBelch("%c", strtab[i] );
2074 debugBelch("--- END of string table---\n");
2079 COFF_symbol* symtab_i;
2080 if (i >= (Int32)(hdr->NumberOfSymbols)) break;
2081 symtab_i = (COFF_symbol*)
2082 myindex ( sizeof_COFF_symbol, symtab, i );
2088 printName ( symtab_i->Name, strtab );
2097 (Int32)(symtab_i->SectionNumber),
2098 (UInt32)symtab_i->Type,
2099 (UInt32)symtab_i->StorageClass,
2100 (UInt32)symtab_i->NumberOfAuxSymbols
2102 i += symtab_i->NumberOfAuxSymbols;
2112 ocGetNames_PEi386 ( ObjectCode* oc )
2115 COFF_section* sectab;
2116 COFF_symbol* symtab;
2123 hdr = (COFF_header*)(oc->image);
2124 sectab = (COFF_section*) (
2125 ((UChar*)(oc->image))
2126 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2128 symtab = (COFF_symbol*) (
2129 ((UChar*)(oc->image))
2130 + hdr->PointerToSymbolTable
2132 strtab = ((UChar*)(oc->image))
2133 + hdr->PointerToSymbolTable
2134 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
2136 /* Allocate space for any (local, anonymous) .bss sections. */
2138 for (i = 0; i < hdr->NumberOfSections; i++) {
2141 COFF_section* sectab_i
2143 myindex ( sizeof_COFF_section, sectab, i );
2144 if (0 != strcmp(sectab_i->Name, ".bss")) continue;
2145 /* sof 10/05: the PE spec text isn't too clear regarding what
2146 * the SizeOfRawData field is supposed to hold for object
2147 * file sections containing just uninitialized data -- for executables,
2148 * it is supposed to be zero; unclear what it's supposed to be
2149 * for object files. However, VirtualSize is guaranteed to be
2150 * zero for object files, which definitely suggests that SizeOfRawData
2151 * will be non-zero (where else would the size of this .bss section be
2152 * stored?) Looking at the COFF_section info for incoming object files,
2153 * this certainly appears to be the case.
2155 * => I suspect we've been incorrectly handling .bss sections in (relocatable)
2156 * object files up until now. This turned out to bite us with ghc-6.4.1's use
2157 * of gcc-3.4.x, which has started to emit initially-zeroed-out local 'static'
2158 * variable decls into to the .bss section. (The specific function in Q which
2159 * triggered this is libraries/base/cbits/dirUtils.c:__hscore_getFolderPath())
2161 if (sectab_i->VirtualSize == 0 && sectab_i->SizeOfRawData == 0) continue;
2162 /* This is a non-empty .bss section. Allocate zeroed space for
2163 it, and set its PointerToRawData field such that oc->image +
2164 PointerToRawData == addr_of_zeroed_space. */
2165 bss_sz = sectab_i->VirtualSize;
2166 if ( bss_sz < sectab_i->SizeOfRawData) { bss_sz = sectab_i->SizeOfRawData; }
2167 zspace = stgCallocBytes(1, bss_sz, "ocGetNames_PEi386(anonymous bss)");
2168 sectab_i->PointerToRawData = ((UChar*)zspace) - ((UChar*)(oc->image));
2169 addProddableBlock(oc, zspace, bss_sz);
2170 /* debugBelch("BSS anon section at 0x%x\n", zspace); */
2173 /* Copy section information into the ObjectCode. */
2175 for (i = 0; i < hdr->NumberOfSections; i++) {
2181 = SECTIONKIND_OTHER;
2182 COFF_section* sectab_i
2184 myindex ( sizeof_COFF_section, sectab, i );
2185 IF_DEBUG(linker, debugBelch("section name = %s\n", sectab_i->Name ));
2188 /* I'm sure this is the Right Way to do it. However, the
2189 alternative of testing the sectab_i->Name field seems to
2190 work ok with Cygwin.
2192 if (sectab_i->Characteristics & MYIMAGE_SCN_CNT_CODE ||
2193 sectab_i->Characteristics & MYIMAGE_SCN_CNT_INITIALIZED_DATA)
2194 kind = SECTIONKIND_CODE_OR_RODATA;
2197 if (0==strcmp(".text",sectab_i->Name) ||
2198 0==strcmp(".rdata",sectab_i->Name)||
2199 0==strcmp(".rodata",sectab_i->Name))
2200 kind = SECTIONKIND_CODE_OR_RODATA;
2201 if (0==strcmp(".data",sectab_i->Name) ||
2202 0==strcmp(".bss",sectab_i->Name))
2203 kind = SECTIONKIND_RWDATA;
2205 ASSERT(sectab_i->SizeOfRawData == 0 || sectab_i->VirtualSize == 0);
2206 sz = sectab_i->SizeOfRawData;
2207 if (sz < sectab_i->VirtualSize) sz = sectab_i->VirtualSize;
2209 start = ((UChar*)(oc->image)) + sectab_i->PointerToRawData;
2210 end = start + sz - 1;
2212 if (kind == SECTIONKIND_OTHER
2213 /* Ignore sections called which contain stabs debugging
2215 && 0 != strcmp(".stab", sectab_i->Name)
2216 && 0 != strcmp(".stabstr", sectab_i->Name)
2217 /* ignore constructor section for now */
2218 && 0 != strcmp(".ctors", sectab_i->Name)
2219 /* ignore section generated from .ident */
2220 && 0!= strcmp("/4", sectab_i->Name)
2222 errorBelch("Unknown PEi386 section name `%s' (while processing: %s)", sectab_i->Name, oc->fileName);
2226 if (kind != SECTIONKIND_OTHER && end >= start) {
2227 addSection(oc, kind, start, end);
2228 addProddableBlock(oc, start, end - start + 1);
2232 /* Copy exported symbols into the ObjectCode. */
2234 oc->n_symbols = hdr->NumberOfSymbols;
2235 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
2236 "ocGetNames_PEi386(oc->symbols)");
2237 /* Call me paranoid; I don't care. */
2238 for (i = 0; i < oc->n_symbols; i++)
2239 oc->symbols[i] = NULL;
2243 COFF_symbol* symtab_i;
2244 if (i >= (Int32)(hdr->NumberOfSymbols)) break;
2245 symtab_i = (COFF_symbol*)
2246 myindex ( sizeof_COFF_symbol, symtab, i );
2250 if (symtab_i->StorageClass == MYIMAGE_SYM_CLASS_EXTERNAL
2251 && symtab_i->SectionNumber != MYIMAGE_SYM_UNDEFINED) {
2252 /* This symbol is global and defined, viz, exported */
2253 /* for MYIMAGE_SYMCLASS_EXTERNAL
2254 && !MYIMAGE_SYM_UNDEFINED,
2255 the address of the symbol is:
2256 address of relevant section + offset in section
2258 COFF_section* sectabent
2259 = (COFF_section*) myindex ( sizeof_COFF_section,
2261 symtab_i->SectionNumber-1 );
2262 addr = ((UChar*)(oc->image))
2263 + (sectabent->PointerToRawData
2267 if (symtab_i->SectionNumber == MYIMAGE_SYM_UNDEFINED
2268 && symtab_i->Value > 0) {
2269 /* This symbol isn't in any section at all, ie, global bss.
2270 Allocate zeroed space for it. */
2271 addr = stgCallocBytes(1, symtab_i->Value,
2272 "ocGetNames_PEi386(non-anonymous bss)");
2273 addSection(oc, SECTIONKIND_RWDATA, addr,
2274 ((UChar*)addr) + symtab_i->Value - 1);
2275 addProddableBlock(oc, addr, symtab_i->Value);
2276 /* debugBelch("BSS section at 0x%x\n", addr); */
2279 if (addr != NULL ) {
2280 sname = cstring_from_COFF_symbol_name ( symtab_i->Name, strtab );
2281 /* debugBelch("addSymbol %p `%s \n", addr,sname); */
2282 IF_DEBUG(linker, debugBelch("addSymbol %p `%s'\n", addr,sname);)
2283 ASSERT(i >= 0 && i < oc->n_symbols);
2284 /* cstring_from_COFF_symbol_name always succeeds. */
2285 oc->symbols[i] = sname;
2286 ghciInsertStrHashTable(oc->fileName, symhash, sname, addr);
2290 "IGNORING symbol %d\n"
2294 printName ( symtab_i->Name, strtab );
2303 (Int32)(symtab_i->SectionNumber),
2304 (UInt32)symtab_i->Type,
2305 (UInt32)symtab_i->StorageClass,
2306 (UInt32)symtab_i->NumberOfAuxSymbols
2311 i += symtab_i->NumberOfAuxSymbols;
2320 ocResolve_PEi386 ( ObjectCode* oc )
2323 COFF_section* sectab;
2324 COFF_symbol* symtab;
2334 /* ToDo: should be variable-sized? But is at least safe in the
2335 sense of buffer-overrun-proof. */
2337 /* debugBelch("resolving for %s\n", oc->fileName); */
2339 hdr = (COFF_header*)(oc->image);
2340 sectab = (COFF_section*) (
2341 ((UChar*)(oc->image))
2342 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2344 symtab = (COFF_symbol*) (
2345 ((UChar*)(oc->image))
2346 + hdr->PointerToSymbolTable
2348 strtab = ((UChar*)(oc->image))
2349 + hdr->PointerToSymbolTable
2350 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
2352 for (i = 0; i < hdr->NumberOfSections; i++) {
2353 COFF_section* sectab_i
2355 myindex ( sizeof_COFF_section, sectab, i );
2358 ((UChar*)(oc->image)) + sectab_i->PointerToRelocations
2361 /* Ignore sections called which contain stabs debugging
2363 if (0 == strcmp(".stab", sectab_i->Name)
2364 || 0 == strcmp(".stabstr", sectab_i->Name)
2365 || 0 == strcmp(".ctors", sectab_i->Name))
2368 if ( sectab_i->Characteristics & MYIMAGE_SCN_LNK_NRELOC_OVFL ) {
2369 /* If the relocation field (a short) has overflowed, the
2370 * real count can be found in the first reloc entry.
2372 * See Section 4.1 (last para) of the PE spec (rev6.0).
2374 * Nov2003 update: the GNU linker still doesn't correctly
2375 * handle the generation of relocatable object files with
2376 * overflown relocations. Hence the output to warn of potential
2379 COFF_reloc* rel = (COFF_reloc*)
2380 myindex ( sizeof_COFF_reloc, reltab, 0 );
2381 noRelocs = rel->VirtualAddress;
2383 /* 10/05: we now assume (and check for) a GNU ld that is capable
2384 * of handling object files with (>2^16) of relocs.
2387 debugBelch("WARNING: Overflown relocation field (# relocs found: %u)\n",
2392 noRelocs = sectab_i->NumberOfRelocations;
2397 for (; j < noRelocs; j++) {
2399 COFF_reloc* reltab_j
2401 myindex ( sizeof_COFF_reloc, reltab, j );
2403 /* the location to patch */
2405 ((UChar*)(oc->image))
2406 + (sectab_i->PointerToRawData
2407 + reltab_j->VirtualAddress
2408 - sectab_i->VirtualAddress )
2410 /* the existing contents of pP */
2412 /* the symbol to connect to */
2413 sym = (COFF_symbol*)
2414 myindex ( sizeof_COFF_symbol,
2415 symtab, reltab_j->SymbolTableIndex );
2418 "reloc sec %2d num %3d: type 0x%-4x "
2419 "vaddr 0x%-8x name `",
2421 (UInt32)reltab_j->Type,
2422 reltab_j->VirtualAddress );
2423 printName ( sym->Name, strtab );
2424 debugBelch("'\n" ));
2426 if (sym->StorageClass == MYIMAGE_SYM_CLASS_STATIC) {
2427 COFF_section* section_sym
2428 = findPEi386SectionCalled ( oc, sym->Name );
2430 errorBelch("%s: can't find section `%s'", oc->fileName, sym->Name);
2433 S = ((UInt32)(oc->image))
2434 + (section_sym->PointerToRawData
2437 copyName ( sym->Name, strtab, symbol, 1000-1 );
2438 S = (UInt32) lookupLocalSymbol( oc, symbol );
2439 if ((void*)S != NULL) goto foundit;
2440 S = (UInt32) lookupSymbol( symbol );
2441 if ((void*)S != NULL) goto foundit;
2442 zapTrailingAtSign ( symbol );
2443 S = (UInt32) lookupLocalSymbol( oc, symbol );
2444 if ((void*)S != NULL) goto foundit;
2445 S = (UInt32) lookupSymbol( symbol );
2446 if ((void*)S != NULL) goto foundit;
2447 /* Newline first because the interactive linker has printed "linking..." */
2448 errorBelch("\n%s: unknown symbol `%s'", oc->fileName, symbol);
2452 checkProddableBlock(oc, pP);
2453 switch (reltab_j->Type) {
2454 case MYIMAGE_REL_I386_DIR32:
2457 case MYIMAGE_REL_I386_REL32:
2458 /* Tricky. We have to insert a displacement at
2459 pP which, when added to the PC for the _next_
2460 insn, gives the address of the target (S).
2461 Problem is to know the address of the next insn
2462 when we only know pP. We assume that this
2463 literal field is always the last in the insn,
2464 so that the address of the next insn is pP+4
2465 -- hence the constant 4.
2466 Also I don't know if A should be added, but so
2467 far it has always been zero.
2469 SOF 05/2005: 'A' (old contents of *pP) have been observed
2470 to contain values other than zero (the 'wx' object file
2471 that came with wxhaskell-0.9.4; dunno how it was compiled..).
2472 So, add displacement to old value instead of asserting
2473 A to be zero. Fixes wxhaskell-related crashes, and no other
2474 ill effects have been observed.
2476 Update: the reason why we're seeing these more elaborate
2477 relocations is due to a switch in how the NCG compiles SRTs
2478 and offsets to them from info tables. SRTs live in .(ro)data,
2479 while info tables live in .text, causing GAS to emit REL32/DISP32
2480 relocations with non-zero values. Adding the displacement is
2481 the right thing to do.
2483 *pP = S - ((UInt32)pP) - 4 + A;
2486 debugBelch("%s: unhandled PEi386 relocation type %d",
2487 oc->fileName, reltab_j->Type);
2494 IF_DEBUG(linker, debugBelch("completed %s", oc->fileName));
2498 #endif /* defined(OBJFORMAT_PEi386) */
2501 /* --------------------------------------------------------------------------
2503 * ------------------------------------------------------------------------*/
2505 #if defined(OBJFORMAT_ELF)
2510 #if defined(sparc_HOST_ARCH)
2511 # define ELF_TARGET_SPARC /* Used inside <elf.h> */
2512 #elif defined(i386_HOST_ARCH)
2513 # define ELF_TARGET_386 /* Used inside <elf.h> */
2514 #elif defined(x86_64_HOST_ARCH)
2515 # define ELF_TARGET_X64_64
2517 #elif defined (ia64_HOST_ARCH)
2518 # define ELF_TARGET_IA64 /* Used inside <elf.h> */
2520 # define ELF_FUNCTION_DESC /* calling convention uses function descriptors */
2521 # define ELF_NEED_GOT /* needs Global Offset Table */
2522 # define ELF_NEED_PLT /* needs Procedure Linkage Tables */
2525 #if !defined(openbsd_HOST_OS)
2528 /* openbsd elf has things in different places, with diff names */
2529 #include <elf_abi.h>
2530 #include <machine/reloc.h>
2531 #define R_386_32 RELOC_32
2532 #define R_386_PC32 RELOC_PC32
2536 * Define a set of types which can be used for both ELF32 and ELF64
2540 #define ELFCLASS ELFCLASS64
2541 #define Elf_Addr Elf64_Addr
2542 #define Elf_Word Elf64_Word
2543 #define Elf_Sword Elf64_Sword
2544 #define Elf_Ehdr Elf64_Ehdr
2545 #define Elf_Phdr Elf64_Phdr
2546 #define Elf_Shdr Elf64_Shdr
2547 #define Elf_Sym Elf64_Sym
2548 #define Elf_Rel Elf64_Rel
2549 #define Elf_Rela Elf64_Rela
2550 #define ELF_ST_TYPE ELF64_ST_TYPE
2551 #define ELF_ST_BIND ELF64_ST_BIND
2552 #define ELF_R_TYPE ELF64_R_TYPE
2553 #define ELF_R_SYM ELF64_R_SYM
2555 #define ELFCLASS ELFCLASS32
2556 #define Elf_Addr Elf32_Addr
2557 #define Elf_Word Elf32_Word
2558 #define Elf_Sword Elf32_Sword
2559 #define Elf_Ehdr Elf32_Ehdr
2560 #define Elf_Phdr Elf32_Phdr
2561 #define Elf_Shdr Elf32_Shdr
2562 #define Elf_Sym Elf32_Sym
2563 #define Elf_Rel Elf32_Rel
2564 #define Elf_Rela Elf32_Rela
2566 #define ELF_ST_TYPE ELF32_ST_TYPE
2569 #define ELF_ST_BIND ELF32_ST_BIND
2572 #define ELF_R_TYPE ELF32_R_TYPE
2575 #define ELF_R_SYM ELF32_R_SYM
2581 * Functions to allocate entries in dynamic sections. Currently we simply
2582 * preallocate a large number, and we don't check if a entry for the given
2583 * target already exists (a linear search is too slow). Ideally these
2584 * entries would be associated with symbols.
2587 /* These sizes sufficient to load HSbase + HShaskell98 + a few modules */
2588 #define GOT_SIZE 0x20000
2589 #define FUNCTION_TABLE_SIZE 0x10000
2590 #define PLT_SIZE 0x08000
2593 static Elf_Addr got[GOT_SIZE];
2594 static unsigned int gotIndex;
2595 static Elf_Addr gp_val = (Elf_Addr)got;
2598 allocateGOTEntry(Elf_Addr target)
2602 if (gotIndex >= GOT_SIZE)
2603 barf("Global offset table overflow");
2605 entry = &got[gotIndex++];
2607 return (Elf_Addr)entry;
2611 #ifdef ELF_FUNCTION_DESC
2617 static FunctionDesc functionTable[FUNCTION_TABLE_SIZE];
2618 static unsigned int functionTableIndex;
2621 allocateFunctionDesc(Elf_Addr target)
2623 FunctionDesc *entry;
2625 if (functionTableIndex >= FUNCTION_TABLE_SIZE)
2626 barf("Function table overflow");
2628 entry = &functionTable[functionTableIndex++];
2630 entry->gp = (Elf_Addr)gp_val;
2631 return (Elf_Addr)entry;
2635 copyFunctionDesc(Elf_Addr target)
2637 FunctionDesc *olddesc = (FunctionDesc *)target;
2638 FunctionDesc *newdesc;
2640 newdesc = (FunctionDesc *)allocateFunctionDesc(olddesc->ip);
2641 newdesc->gp = olddesc->gp;
2642 return (Elf_Addr)newdesc;
2647 #ifdef ia64_HOST_ARCH
2648 static void ia64_reloc_gprel22(Elf_Addr target, Elf_Addr value);
2649 static void ia64_reloc_pcrel21(Elf_Addr target, Elf_Addr value, ObjectCode *oc);
2651 static unsigned char plt_code[] =
2653 /* taken from binutils bfd/elfxx-ia64.c */
2654 0x0b, 0x78, 0x00, 0x02, 0x00, 0x24, /* [MMI] addl r15=0,r1;; */
2655 0x00, 0x41, 0x3c, 0x30, 0x28, 0xc0, /* ld8 r16=[r15],8 */
2656 0x01, 0x08, 0x00, 0x84, /* mov r14=r1;; */
2657 0x11, 0x08, 0x00, 0x1e, 0x18, 0x10, /* [MIB] ld8 r1=[r15] */
2658 0x60, 0x80, 0x04, 0x80, 0x03, 0x00, /* mov b6=r16 */
2659 0x60, 0x00, 0x80, 0x00 /* br.few b6;; */
2662 /* If we can't get to the function descriptor via gp, take a local copy of it */
2663 #define PLT_RELOC(code, target) { \
2664 Elf64_Sxword rel_value = target - gp_val; \
2665 if ((rel_value > 0x1fffff) || (rel_value < -0x1fffff)) \
2666 ia64_reloc_gprel22((Elf_Addr)code, copyFunctionDesc(target)); \
2668 ia64_reloc_gprel22((Elf_Addr)code, target); \
2673 unsigned char code[sizeof(plt_code)];
2677 allocatePLTEntry(Elf_Addr target, ObjectCode *oc)
2679 PLTEntry *plt = (PLTEntry *)oc->plt;
2682 if (oc->pltIndex >= PLT_SIZE)
2683 barf("Procedure table overflow");
2685 entry = &plt[oc->pltIndex++];
2686 memcpy(entry->code, plt_code, sizeof(entry->code));
2687 PLT_RELOC(entry->code, target);
2688 return (Elf_Addr)entry;
2694 return (PLT_SIZE * sizeof(PLTEntry));
2699 #if x86_64_HOST_ARCH
2700 // On x86_64, 32-bit relocations are often used, which requires that
2701 // we can resolve a symbol to a 32-bit offset. However, shared
2702 // libraries are placed outside the 2Gb area, which leaves us with a
2703 // problem when we need to give a 32-bit offset to a symbol in a
2706 // For a function symbol, we can allocate a bounce sequence inside the
2707 // 2Gb area and resolve the symbol to this. The bounce sequence is
2708 // simply a long jump instruction to the real location of the symbol.
2710 // For data references, we're screwed.
2713 unsigned char jmp[8]; /* 6 byte instruction: jmpq *0x00000002(%rip) */
2717 #define X86_64_BB_SIZE 1024
2719 static x86_64_bounce *x86_64_bounce_buffer = NULL;
2720 static nat x86_64_bb_next_off;
2723 x86_64_high_symbol( char *lbl, void *addr )
2725 x86_64_bounce *bounce;
2727 if ( x86_64_bounce_buffer == NULL ||
2728 x86_64_bb_next_off >= X86_64_BB_SIZE ) {
2729 x86_64_bounce_buffer =
2730 mmap(NULL, X86_64_BB_SIZE * sizeof(x86_64_bounce),
2731 PROT_EXEC|PROT_READ|PROT_WRITE,
2732 MAP_PRIVATE|MAP_32BIT|MAP_ANONYMOUS, -1, 0);
2733 if (x86_64_bounce_buffer == MAP_FAILED) {
2734 barf("x86_64_high_symbol: mmap failed");
2736 x86_64_bb_next_off = 0;
2738 bounce = &x86_64_bounce_buffer[x86_64_bb_next_off];
2739 bounce->jmp[0] = 0xff;
2740 bounce->jmp[1] = 0x25;
2741 bounce->jmp[2] = 0x02;
2742 bounce->jmp[3] = 0x00;
2743 bounce->jmp[4] = 0x00;
2744 bounce->jmp[5] = 0x00;
2745 bounce->addr = addr;
2746 x86_64_bb_next_off++;
2748 IF_DEBUG(linker, debugBelch("x86_64: allocated bounce entry for %s->%p at %p\n",
2749 lbl, addr, bounce));
2751 insertStrHashTable(symhash, lbl, bounce);
2758 * Generic ELF functions
2762 findElfSection ( void* objImage, Elf_Word sh_type )
2764 char* ehdrC = (char*)objImage;
2765 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2766 Elf_Shdr* shdr = (Elf_Shdr*)(ehdrC + ehdr->e_shoff);
2767 char* sh_strtab = ehdrC + shdr[ehdr->e_shstrndx].sh_offset;
2771 for (i = 0; i < ehdr->e_shnum; i++) {
2772 if (shdr[i].sh_type == sh_type
2773 /* Ignore the section header's string table. */
2774 && i != ehdr->e_shstrndx
2775 /* Ignore string tables named .stabstr, as they contain
2777 && 0 != memcmp(".stabstr", sh_strtab + shdr[i].sh_name, 8)
2779 ptr = ehdrC + shdr[i].sh_offset;
2786 #if defined(ia64_HOST_ARCH)
2788 findElfSegment ( void* objImage, Elf_Addr vaddr )
2790 char* ehdrC = (char*)objImage;
2791 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2792 Elf_Phdr* phdr = (Elf_Phdr*)(ehdrC + ehdr->e_phoff);
2793 Elf_Addr segaddr = 0;
2796 for (i = 0; i < ehdr->e_phnum; i++) {
2797 segaddr = phdr[i].p_vaddr;
2798 if ((vaddr >= segaddr) && (vaddr < segaddr + phdr[i].p_memsz))
2806 ocVerifyImage_ELF ( ObjectCode* oc )
2810 int i, j, nent, nstrtab, nsymtabs;
2814 char* ehdrC = (char*)(oc->image);
2815 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2817 if (ehdr->e_ident[EI_MAG0] != ELFMAG0 ||
2818 ehdr->e_ident[EI_MAG1] != ELFMAG1 ||
2819 ehdr->e_ident[EI_MAG2] != ELFMAG2 ||
2820 ehdr->e_ident[EI_MAG3] != ELFMAG3) {
2821 errorBelch("%s: not an ELF object", oc->fileName);
2825 if (ehdr->e_ident[EI_CLASS] != ELFCLASS) {
2826 errorBelch("%s: unsupported ELF format", oc->fileName);
2830 if (ehdr->e_ident[EI_DATA] == ELFDATA2LSB) {
2831 IF_DEBUG(linker,debugBelch( "Is little-endian\n" ));
2833 if (ehdr->e_ident[EI_DATA] == ELFDATA2MSB) {
2834 IF_DEBUG(linker,debugBelch( "Is big-endian\n" ));
2836 errorBelch("%s: unknown endiannness", oc->fileName);
2840 if (ehdr->e_type != ET_REL) {
2841 errorBelch("%s: not a relocatable object (.o) file", oc->fileName);
2844 IF_DEBUG(linker, debugBelch( "Is a relocatable object (.o) file\n" ));
2846 IF_DEBUG(linker,debugBelch( "Architecture is " ));
2847 switch (ehdr->e_machine) {
2848 case EM_386: IF_DEBUG(linker,debugBelch( "x86" )); break;
2849 #ifdef EM_SPARC32PLUS
2850 case EM_SPARC32PLUS:
2852 case EM_SPARC: IF_DEBUG(linker,debugBelch( "sparc" )); break;
2854 case EM_IA_64: IF_DEBUG(linker,debugBelch( "ia64" )); break;
2856 case EM_PPC: IF_DEBUG(linker,debugBelch( "powerpc32" )); break;
2858 case EM_X86_64: IF_DEBUG(linker,debugBelch( "x86_64" )); break;
2860 default: IF_DEBUG(linker,debugBelch( "unknown" ));
2861 errorBelch("%s: unknown architecture", oc->fileName);
2865 IF_DEBUG(linker,debugBelch(
2866 "\nSection header table: start %ld, n_entries %d, ent_size %d\n",
2867 (long)ehdr->e_shoff, ehdr->e_shnum, ehdr->e_shentsize ));
2869 ASSERT (ehdr->e_shentsize == sizeof(Elf_Shdr));
2871 shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
2873 if (ehdr->e_shstrndx == SHN_UNDEF) {
2874 errorBelch("%s: no section header string table", oc->fileName);
2877 IF_DEBUG(linker,debugBelch( "Section header string table is section %d\n",
2879 sh_strtab = ehdrC + shdr[ehdr->e_shstrndx].sh_offset;
2882 for (i = 0; i < ehdr->e_shnum; i++) {
2883 IF_DEBUG(linker,debugBelch("%2d: ", i ));
2884 IF_DEBUG(linker,debugBelch("type=%2d ", (int)shdr[i].sh_type ));
2885 IF_DEBUG(linker,debugBelch("size=%4d ", (int)shdr[i].sh_size ));
2886 IF_DEBUG(linker,debugBelch("offs=%4d ", (int)shdr[i].sh_offset ));
2887 IF_DEBUG(linker,debugBelch(" (%p .. %p) ",
2888 ehdrC + shdr[i].sh_offset,
2889 ehdrC + shdr[i].sh_offset + shdr[i].sh_size - 1));
2891 if (shdr[i].sh_type == SHT_REL) {
2892 IF_DEBUG(linker,debugBelch("Rel " ));
2893 } else if (shdr[i].sh_type == SHT_RELA) {
2894 IF_DEBUG(linker,debugBelch("RelA " ));
2896 IF_DEBUG(linker,debugBelch(" "));
2899 IF_DEBUG(linker,debugBelch("sname=%s\n", sh_strtab + shdr[i].sh_name ));
2903 IF_DEBUG(linker,debugBelch( "\nString tables" ));
2906 for (i = 0; i < ehdr->e_shnum; i++) {
2907 if (shdr[i].sh_type == SHT_STRTAB
2908 /* Ignore the section header's string table. */
2909 && i != ehdr->e_shstrndx
2910 /* Ignore string tables named .stabstr, as they contain
2912 && 0 != memcmp(".stabstr", sh_strtab + shdr[i].sh_name, 8)
2914 IF_DEBUG(linker,debugBelch(" section %d is a normal string table", i ));
2915 strtab = ehdrC + shdr[i].sh_offset;
2920 errorBelch("%s: no string tables, or too many", oc->fileName);
2925 IF_DEBUG(linker,debugBelch( "\nSymbol tables" ));
2926 for (i = 0; i < ehdr->e_shnum; i++) {
2927 if (shdr[i].sh_type != SHT_SYMTAB) continue;
2928 IF_DEBUG(linker,debugBelch( "section %d is a symbol table\n", i ));
2930 stab = (Elf_Sym*) (ehdrC + shdr[i].sh_offset);
2931 nent = shdr[i].sh_size / sizeof(Elf_Sym);
2932 IF_DEBUG(linker,debugBelch( " number of entries is apparently %d (%ld rem)\n",
2934 (long)shdr[i].sh_size % sizeof(Elf_Sym)
2936 if (0 != shdr[i].sh_size % sizeof(Elf_Sym)) {
2937 errorBelch("%s: non-integral number of symbol table entries", oc->fileName);
2940 for (j = 0; j < nent; j++) {
2941 IF_DEBUG(linker,debugBelch(" %2d ", j ));
2942 IF_DEBUG(linker,debugBelch(" sec=%-5d size=%-3d val=%5p ",
2943 (int)stab[j].st_shndx,
2944 (int)stab[j].st_size,
2945 (char*)stab[j].st_value ));
2947 IF_DEBUG(linker,debugBelch("type=" ));
2948 switch (ELF_ST_TYPE(stab[j].st_info)) {
2949 case STT_NOTYPE: IF_DEBUG(linker,debugBelch("notype " )); break;
2950 case STT_OBJECT: IF_DEBUG(linker,debugBelch("object " )); break;
2951 case STT_FUNC : IF_DEBUG(linker,debugBelch("func " )); break;
2952 case STT_SECTION: IF_DEBUG(linker,debugBelch("section" )); break;
2953 case STT_FILE: IF_DEBUG(linker,debugBelch("file " )); break;
2954 default: IF_DEBUG(linker,debugBelch("? " )); break;
2956 IF_DEBUG(linker,debugBelch(" " ));
2958 IF_DEBUG(linker,debugBelch("bind=" ));
2959 switch (ELF_ST_BIND(stab[j].st_info)) {
2960 case STB_LOCAL : IF_DEBUG(linker,debugBelch("local " )); break;
2961 case STB_GLOBAL: IF_DEBUG(linker,debugBelch("global" )); break;
2962 case STB_WEAK : IF_DEBUG(linker,debugBelch("weak " )); break;
2963 default: IF_DEBUG(linker,debugBelch("? " )); break;
2965 IF_DEBUG(linker,debugBelch(" " ));
2967 IF_DEBUG(linker,debugBelch("name=%s\n", strtab + stab[j].st_name ));
2971 if (nsymtabs == 0) {
2972 errorBelch("%s: didn't find any symbol tables", oc->fileName);
2979 static int getSectionKind_ELF( Elf_Shdr *hdr, int *is_bss )
2983 if (hdr->sh_type == SHT_PROGBITS
2984 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_EXECINSTR)) {
2985 /* .text-style section */
2986 return SECTIONKIND_CODE_OR_RODATA;
2989 if (hdr->sh_type == SHT_PROGBITS
2990 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_WRITE)) {
2991 /* .data-style section */
2992 return SECTIONKIND_RWDATA;
2995 if (hdr->sh_type == SHT_PROGBITS
2996 && (hdr->sh_flags & SHF_ALLOC) && !(hdr->sh_flags & SHF_WRITE)) {
2997 /* .rodata-style section */
2998 return SECTIONKIND_CODE_OR_RODATA;
3001 if (hdr->sh_type == SHT_NOBITS
3002 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_WRITE)) {
3003 /* .bss-style section */
3005 return SECTIONKIND_RWDATA;
3008 return SECTIONKIND_OTHER;
3013 ocGetNames_ELF ( ObjectCode* oc )
3018 char* ehdrC = (char*)(oc->image);
3019 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
3020 char* strtab = findElfSection ( ehdrC, SHT_STRTAB );
3021 Elf_Shdr* shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
3023 ASSERT(symhash != NULL);
3026 errorBelch("%s: no strtab", oc->fileName);
3031 for (i = 0; i < ehdr->e_shnum; i++) {
3032 /* Figure out what kind of section it is. Logic derived from
3033 Figure 1.14 ("Special Sections") of the ELF document
3034 ("Portable Formats Specification, Version 1.1"). */
3036 SectionKind kind = getSectionKind_ELF(&shdr[i], &is_bss);
3038 if (is_bss && shdr[i].sh_size > 0) {
3039 /* This is a non-empty .bss section. Allocate zeroed space for
3040 it, and set its .sh_offset field such that
3041 ehdrC + .sh_offset == addr_of_zeroed_space. */
3042 char* zspace = stgCallocBytes(1, shdr[i].sh_size,
3043 "ocGetNames_ELF(BSS)");
3044 shdr[i].sh_offset = ((char*)zspace) - ((char*)ehdrC);
3046 debugBelch("BSS section at 0x%x, size %d\n",
3047 zspace, shdr[i].sh_size);
3051 /* fill in the section info */
3052 if (kind != SECTIONKIND_OTHER && shdr[i].sh_size > 0) {
3053 addProddableBlock(oc, ehdrC + shdr[i].sh_offset, shdr[i].sh_size);
3054 addSection(oc, kind, ehdrC + shdr[i].sh_offset,
3055 ehdrC + shdr[i].sh_offset + shdr[i].sh_size - 1);
3058 if (shdr[i].sh_type != SHT_SYMTAB) continue;
3060 /* copy stuff into this module's object symbol table */
3061 stab = (Elf_Sym*) (ehdrC + shdr[i].sh_offset);
3062 nent = shdr[i].sh_size / sizeof(Elf_Sym);
3064 oc->n_symbols = nent;
3065 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
3066 "ocGetNames_ELF(oc->symbols)");
3068 for (j = 0; j < nent; j++) {
3070 char isLocal = FALSE; /* avoids uninit-var warning */
3072 char* nm = strtab + stab[j].st_name;
3073 int secno = stab[j].st_shndx;
3075 /* Figure out if we want to add it; if so, set ad to its
3076 address. Otherwise leave ad == NULL. */
3078 if (secno == SHN_COMMON) {
3080 ad = stgCallocBytes(1, stab[j].st_size, "ocGetNames_ELF(COMMON)");
3082 debugBelch("COMMON symbol, size %d name %s\n",
3083 stab[j].st_size, nm);
3085 /* Pointless to do addProddableBlock() for this area,
3086 since the linker should never poke around in it. */
3089 if ( ( ELF_ST_BIND(stab[j].st_info)==STB_GLOBAL
3090 || ELF_ST_BIND(stab[j].st_info)==STB_LOCAL
3092 /* and not an undefined symbol */
3093 && stab[j].st_shndx != SHN_UNDEF
3094 /* and not in a "special section" */
3095 && stab[j].st_shndx < SHN_LORESERVE
3097 /* and it's a not a section or string table or anything silly */
3098 ( ELF_ST_TYPE(stab[j].st_info)==STT_FUNC ||
3099 ELF_ST_TYPE(stab[j].st_info)==STT_OBJECT ||
3100 ELF_ST_TYPE(stab[j].st_info)==STT_NOTYPE
3103 /* Section 0 is the undefined section, hence > and not >=. */
3104 ASSERT(secno > 0 && secno < ehdr->e_shnum);
3106 if (shdr[secno].sh_type == SHT_NOBITS) {
3107 debugBelch(" BSS symbol, size %d off %d name %s\n",
3108 stab[j].st_size, stab[j].st_value, nm);
3111 ad = ehdrC + shdr[ secno ].sh_offset + stab[j].st_value;
3112 if (ELF_ST_BIND(stab[j].st_info)==STB_LOCAL) {
3115 #ifdef ELF_FUNCTION_DESC
3116 /* dlsym() and the initialisation table both give us function
3117 * descriptors, so to be consistent we store function descriptors
3118 * in the symbol table */
3119 if (ELF_ST_TYPE(stab[j].st_info) == STT_FUNC)
3120 ad = (char *)allocateFunctionDesc((Elf_Addr)ad);
3122 IF_DEBUG(linker,debugBelch( "addOTabName(GLOB): %10p %s %s",
3123 ad, oc->fileName, nm ));
3128 /* And the decision is ... */
3132 oc->symbols[j] = nm;
3135 /* Ignore entirely. */
3137 ghciInsertStrHashTable(oc->fileName, symhash, nm, ad);
3141 IF_DEBUG(linker,debugBelch( "skipping `%s'\n",
3142 strtab + stab[j].st_name ));
3145 "skipping bind = %d, type = %d, shndx = %d `%s'\n",
3146 (int)ELF_ST_BIND(stab[j].st_info),
3147 (int)ELF_ST_TYPE(stab[j].st_info),
3148 (int)stab[j].st_shndx,
3149 strtab + stab[j].st_name
3152 oc->symbols[j] = NULL;
3161 /* Do ELF relocations which lack an explicit addend. All x86-linux
3162 relocations appear to be of this form. */
3164 do_Elf_Rel_relocations ( ObjectCode* oc, char* ehdrC,
3165 Elf_Shdr* shdr, int shnum,
3166 Elf_Sym* stab, char* strtab )
3171 Elf_Rel* rtab = (Elf_Rel*) (ehdrC + shdr[shnum].sh_offset);
3172 int nent = shdr[shnum].sh_size / sizeof(Elf_Rel);
3173 int target_shndx = shdr[shnum].sh_info;
3174 int symtab_shndx = shdr[shnum].sh_link;
3176 stab = (Elf_Sym*) (ehdrC + shdr[ symtab_shndx ].sh_offset);
3177 targ = (Elf_Word*)(ehdrC + shdr[ target_shndx ].sh_offset);
3178 IF_DEBUG(linker,debugBelch( "relocations for section %d using symtab %d\n",
3179 target_shndx, symtab_shndx ));
3181 /* Skip sections that we're not interested in. */
3184 SectionKind kind = getSectionKind_ELF(&shdr[target_shndx], &is_bss);
3185 if (kind == SECTIONKIND_OTHER) {
3186 IF_DEBUG(linker,debugBelch( "skipping (target section not loaded)"));
3191 for (j = 0; j < nent; j++) {
3192 Elf_Addr offset = rtab[j].r_offset;
3193 Elf_Addr info = rtab[j].r_info;
3195 Elf_Addr P = ((Elf_Addr)targ) + offset;
3196 Elf_Word* pP = (Elf_Word*)P;
3201 StgStablePtr stablePtr;
3204 IF_DEBUG(linker,debugBelch( "Rel entry %3d is raw(%6p %6p)",
3205 j, (void*)offset, (void*)info ));
3207 IF_DEBUG(linker,debugBelch( " ZERO" ));
3210 Elf_Sym sym = stab[ELF_R_SYM(info)];
3211 /* First see if it is a local symbol. */
3212 if (ELF_ST_BIND(sym.st_info) == STB_LOCAL) {
3213 /* Yes, so we can get the address directly from the ELF symbol
3215 symbol = sym.st_name==0 ? "(noname)" : strtab+sym.st_name;
3217 (ehdrC + shdr[ sym.st_shndx ].sh_offset
3218 + stab[ELF_R_SYM(info)].st_value);
3221 symbol = strtab + sym.st_name;
3222 stablePtr = (StgStablePtr)lookupHashTable(stablehash, (StgWord)symbol);
3223 if (NULL == stablePtr) {
3224 /* No, so look up the name in our global table. */
3225 S_tmp = lookupSymbol( symbol );
3226 S = (Elf_Addr)S_tmp;
3228 stableVal = deRefStablePtr( stablePtr );
3230 S = (Elf_Addr)S_tmp;
3234 errorBelch("%s: unknown symbol `%s'", oc->fileName, symbol);
3237 IF_DEBUG(linker,debugBelch( "`%s' resolves to %p\n", symbol, (void*)S ));
3240 IF_DEBUG(linker,debugBelch( "Reloc: P = %p S = %p A = %p\n",
3241 (void*)P, (void*)S, (void*)A ));
3242 checkProddableBlock ( oc, pP );
3246 switch (ELF_R_TYPE(info)) {
3247 # ifdef i386_HOST_ARCH
3248 case R_386_32: *pP = value; break;
3249 case R_386_PC32: *pP = value - P; break;
3252 errorBelch("%s: unhandled ELF relocation(Rel) type %lu\n",
3253 oc->fileName, (lnat)ELF_R_TYPE(info));
3261 /* Do ELF relocations for which explicit addends are supplied.
3262 sparc-solaris relocations appear to be of this form. */
3264 do_Elf_Rela_relocations ( ObjectCode* oc, char* ehdrC,
3265 Elf_Shdr* shdr, int shnum,
3266 Elf_Sym* stab, char* strtab )
3269 char *symbol = NULL;
3271 Elf_Rela* rtab = (Elf_Rela*) (ehdrC + shdr[shnum].sh_offset);
3272 int nent = shdr[shnum].sh_size / sizeof(Elf_Rela);
3273 int target_shndx = shdr[shnum].sh_info;
3274 int symtab_shndx = shdr[shnum].sh_link;
3276 stab = (Elf_Sym*) (ehdrC + shdr[ symtab_shndx ].sh_offset);
3277 targ = (Elf_Addr) (ehdrC + shdr[ target_shndx ].sh_offset);
3278 IF_DEBUG(linker,debugBelch( "relocations for section %d using symtab %d\n",
3279 target_shndx, symtab_shndx ));
3281 for (j = 0; j < nent; j++) {
3282 #if defined(DEBUG) || defined(sparc_HOST_ARCH) || defined(ia64_HOST_ARCH) || defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH)
3283 /* This #ifdef only serves to avoid unused-var warnings. */
3284 Elf_Addr offset = rtab[j].r_offset;
3285 Elf_Addr P = targ + offset;
3287 Elf_Addr info = rtab[j].r_info;
3288 Elf_Addr A = rtab[j].r_addend;
3292 # if defined(sparc_HOST_ARCH)
3293 Elf_Word* pP = (Elf_Word*)P;
3295 # elif defined(ia64_HOST_ARCH)
3296 Elf64_Xword *pP = (Elf64_Xword *)P;
3298 # elif defined(powerpc_HOST_ARCH)
3302 IF_DEBUG(linker,debugBelch( "Rel entry %3d is raw(%6p %6p %6p) ",
3303 j, (void*)offset, (void*)info,
3306 IF_DEBUG(linker,debugBelch( " ZERO" ));
3309 Elf_Sym sym = stab[ELF_R_SYM(info)];
3310 /* First see if it is a local symbol. */
3311 if (ELF_ST_BIND(sym.st_info) == STB_LOCAL) {
3312 /* Yes, so we can get the address directly from the ELF symbol
3314 symbol = sym.st_name==0 ? "(noname)" : strtab+sym.st_name;
3316 (ehdrC + shdr[ sym.st_shndx ].sh_offset
3317 + stab[ELF_R_SYM(info)].st_value);
3318 #ifdef ELF_FUNCTION_DESC
3319 /* Make a function descriptor for this function */
3320 if (S && ELF_ST_TYPE(sym.st_info) == STT_FUNC) {
3321 S = allocateFunctionDesc(S + A);
3326 /* No, so look up the name in our global table. */
3327 symbol = strtab + sym.st_name;
3328 S_tmp = lookupSymbol( symbol );
3329 S = (Elf_Addr)S_tmp;
3331 #ifdef ELF_FUNCTION_DESC
3332 /* If a function, already a function descriptor - we would
3333 have to copy it to add an offset. */
3334 if (S && (ELF_ST_TYPE(sym.st_info) == STT_FUNC) && (A != 0))
3335 errorBelch("%s: function %s with addend %p", oc->fileName, symbol, (void *)A);
3339 errorBelch("%s: unknown symbol `%s'", oc->fileName, symbol);
3342 IF_DEBUG(linker,debugBelch( "`%s' resolves to %p", symbol, (void*)S ));
3345 IF_DEBUG(linker,debugBelch("Reloc: P = %p S = %p A = %p\n",
3346 (void*)P, (void*)S, (void*)A ));
3347 /* checkProddableBlock ( oc, (void*)P ); */
3351 switch (ELF_R_TYPE(info)) {
3352 # if defined(sparc_HOST_ARCH)
3353 case R_SPARC_WDISP30:
3354 w1 = *pP & 0xC0000000;
3355 w2 = (Elf_Word)((value - P) >> 2);
3356 ASSERT((w2 & 0xC0000000) == 0);
3361 w1 = *pP & 0xFFC00000;
3362 w2 = (Elf_Word)(value >> 10);
3363 ASSERT((w2 & 0xFFC00000) == 0);
3369 w2 = (Elf_Word)(value & 0x3FF);
3370 ASSERT((w2 & ~0x3FF) == 0);
3374 /* According to the Sun documentation:
3376 This relocation type resembles R_SPARC_32, except it refers to an
3377 unaligned word. That is, the word to be relocated must be treated
3378 as four separate bytes with arbitrary alignment, not as a word
3379 aligned according to the architecture requirements.
3381 (JRS: which means that freeloading on the R_SPARC_32 case
3382 is probably wrong, but hey ...)
3386 w2 = (Elf_Word)value;
3389 # elif defined(ia64_HOST_ARCH)
3390 case R_IA64_DIR64LSB:
3391 case R_IA64_FPTR64LSB:
3394 case R_IA64_PCREL64LSB:
3397 case R_IA64_SEGREL64LSB:
3398 addr = findElfSegment(ehdrC, value);
3401 case R_IA64_GPREL22:
3402 ia64_reloc_gprel22(P, value);
3404 case R_IA64_LTOFF22:
3405 case R_IA64_LTOFF22X:
3406 case R_IA64_LTOFF_FPTR22:
3407 addr = allocateGOTEntry(value);
3408 ia64_reloc_gprel22(P, addr);
3410 case R_IA64_PCREL21B:
3411 ia64_reloc_pcrel21(P, S, oc);
3414 /* This goes with R_IA64_LTOFF22X and points to the load to
3415 * convert into a move. We don't implement relaxation. */
3417 # elif defined(powerpc_HOST_ARCH)
3418 case R_PPC_ADDR16_LO:
3419 *(Elf32_Half*) P = value;
3422 case R_PPC_ADDR16_HI:
3423 *(Elf32_Half*) P = value >> 16;
3426 case R_PPC_ADDR16_HA:
3427 *(Elf32_Half*) P = (value + 0x8000) >> 16;
3431 *(Elf32_Word *) P = value;
3435 *(Elf32_Word *) P = value - P;
3441 if( delta << 6 >> 6 != delta )
3443 value = (Elf_Addr) (&makeSymbolExtra( oc, ELF_R_SYM(info), value )
3447 if( value == 0 || delta << 6 >> 6 != delta )
3449 barf( "Unable to make SymbolExtra for #%d",
3455 *(Elf_Word *) P = (*(Elf_Word *) P & 0xfc000003)
3456 | (delta & 0x3fffffc);
3460 #if x86_64_HOST_ARCH
3462 *(Elf64_Xword *)P = value;
3467 StgInt64 off = value - P;
3468 if (off >= 0x7fffffffL || off < -0x80000000L) {
3469 barf("R_X86_64_PC32 relocation out of range: %s = %p",
3472 *(Elf64_Word *)P = (Elf64_Word)off;
3477 if (value >= 0x7fffffffL) {
3478 barf("R_X86_64_32 relocation out of range: %s = %p\n",
3481 *(Elf64_Word *)P = (Elf64_Word)value;
3485 if ((StgInt64)value > 0x7fffffffL || (StgInt64)value < -0x80000000L) {
3486 barf("R_X86_64_32S relocation out of range: %s = %p\n",
3489 *(Elf64_Sword *)P = (Elf64_Sword)value;
3494 errorBelch("%s: unhandled ELF relocation(RelA) type %lu\n",
3495 oc->fileName, (lnat)ELF_R_TYPE(info));
3504 ocResolve_ELF ( ObjectCode* oc )
3508 Elf_Sym* stab = NULL;
3509 char* ehdrC = (char*)(oc->image);
3510 Elf_Ehdr* ehdr = (Elf_Ehdr*) ehdrC;
3511 Elf_Shdr* shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
3513 /* first find "the" symbol table */
3514 stab = (Elf_Sym*) findElfSection ( ehdrC, SHT_SYMTAB );
3516 /* also go find the string table */
3517 strtab = findElfSection ( ehdrC, SHT_STRTAB );
3519 if (stab == NULL || strtab == NULL) {
3520 errorBelch("%s: can't find string or symbol table", oc->fileName);
3524 /* Process the relocation sections. */
3525 for (shnum = 0; shnum < ehdr->e_shnum; shnum++) {
3526 if (shdr[shnum].sh_type == SHT_REL) {
3527 ok = do_Elf_Rel_relocations ( oc, ehdrC, shdr,
3528 shnum, stab, strtab );
3532 if (shdr[shnum].sh_type == SHT_RELA) {
3533 ok = do_Elf_Rela_relocations ( oc, ehdrC, shdr,
3534 shnum, stab, strtab );
3539 /* Free the local symbol table; we won't need it again. */
3540 freeHashTable(oc->lochash, NULL);
3543 #if defined(powerpc_HOST_ARCH)
3544 ocFlushInstructionCache( oc );
3552 * Instructions are 41 bits long, packed into 128 bit bundles with a 5-bit template
3553 * at the front. The following utility functions pack and unpack instructions, and
3554 * take care of the most common relocations.
3557 #ifdef ia64_HOST_ARCH
3560 ia64_extract_instruction(Elf64_Xword *target)
3563 int slot = (Elf_Addr)target & 3;
3564 target = (Elf_Addr)target & ~3;
3572 return ((w1 >> 5) & 0x1ffffffffff);
3574 return (w1 >> 46) | ((w2 & 0x7fffff) << 18);
3578 barf("ia64_extract_instruction: invalid slot %p", target);
3583 ia64_deposit_instruction(Elf64_Xword *target, Elf64_Xword value)
3585 int slot = (Elf_Addr)target & 3;
3586 target = (Elf_Addr)target & ~3;
3591 *target |= value << 5;
3594 *target |= value << 46;
3595 *(target+1) |= value >> 18;
3598 *(target+1) |= value << 23;
3604 ia64_reloc_gprel22(Elf_Addr target, Elf_Addr value)
3606 Elf64_Xword instruction;
3607 Elf64_Sxword rel_value;
3609 rel_value = value - gp_val;
3610 if ((rel_value > 0x1fffff) || (rel_value < -0x1fffff))
3611 barf("GP-relative data out of range (address = 0x%lx, gp = 0x%lx)", value, gp_val);
3613 instruction = ia64_extract_instruction((Elf64_Xword *)target);
3614 instruction |= (((rel_value >> 0) & 0x07f) << 13) /* imm7b */
3615 | (((rel_value >> 7) & 0x1ff) << 27) /* imm9d */
3616 | (((rel_value >> 16) & 0x01f) << 22) /* imm5c */
3617 | ((Elf64_Xword)(rel_value < 0) << 36); /* s */
3618 ia64_deposit_instruction((Elf64_Xword *)target, instruction);
3622 ia64_reloc_pcrel21(Elf_Addr target, Elf_Addr value, ObjectCode *oc)
3624 Elf64_Xword instruction;
3625 Elf64_Sxword rel_value;
3628 entry = allocatePLTEntry(value, oc);
3630 rel_value = (entry >> 4) - (target >> 4);
3631 if ((rel_value > 0xfffff) || (rel_value < -0xfffff))
3632 barf("PLT entry too far away (entry = 0x%lx, target = 0x%lx)", entry, target);
3634 instruction = ia64_extract_instruction((Elf64_Xword *)target);
3635 instruction |= ((rel_value & 0xfffff) << 13) /* imm20b */
3636 | ((Elf64_Xword)(rel_value < 0) << 36); /* s */
3637 ia64_deposit_instruction((Elf64_Xword *)target, instruction);
3643 * PowerPC ELF specifics
3646 #ifdef powerpc_HOST_ARCH
3648 static int ocAllocateSymbolExtras_ELF( ObjectCode *oc )
3654 ehdr = (Elf_Ehdr *) oc->image;
3655 shdr = (Elf_Shdr *) ( ((char *)oc->image) + ehdr->e_shoff );
3657 for( i = 0; i < ehdr->e_shnum; i++ )
3658 if( shdr[i].sh_type == SHT_SYMTAB )
3661 if( i == ehdr->e_shnum )
3663 errorBelch( "This ELF file contains no symtab" );
3667 if( shdr[i].sh_entsize != sizeof( Elf_Sym ) )
3669 errorBelch( "The entry size (%d) of the symtab isn't %d\n",
3670 shdr[i].sh_entsize, sizeof( Elf_Sym ) );
3675 return ocAllocateSymbolExtras( oc, shdr[i].sh_size / sizeof( Elf_Sym ), 0 );
3678 #endif /* powerpc */
3682 /* --------------------------------------------------------------------------
3684 * ------------------------------------------------------------------------*/
3686 #if defined(OBJFORMAT_MACHO)
3689 Support for MachO linking on Darwin/MacOS X
3690 by Wolfgang Thaller (wolfgang.thaller@gmx.net)
3692 I hereby formally apologize for the hackish nature of this code.
3693 Things that need to be done:
3694 *) implement ocVerifyImage_MachO
3695 *) add still more sanity checks.
3698 #if x86_64_HOST_ARCH || powerpc64_HOST_ARCH
3699 #define mach_header mach_header_64
3700 #define segment_command segment_command_64
3701 #define section section_64
3702 #define nlist nlist_64
3705 #ifdef powerpc_HOST_ARCH
3706 static int ocAllocateSymbolExtras_MachO(ObjectCode* oc)
3708 struct mach_header *header = (struct mach_header *) oc->image;
3709 struct load_command *lc = (struct load_command *) (header + 1);
3712 for( i = 0; i < header->ncmds; i++ )
3714 if( lc->cmd == LC_SYMTAB )
3716 // Find out the first and last undefined external
3717 // symbol, so we don't have to allocate too many
3719 struct symtab_command *symLC = (struct symtab_command *) lc;
3720 unsigned min = symLC->nsyms, max = 0;
3721 struct nlist *nlist =
3722 symLC ? (struct nlist*) ((char*) oc->image + symLC->symoff)
3724 for(i=0;i<symLC->nsyms;i++)
3726 if(nlist[i].n_type & N_STAB)
3728 else if(nlist[i].n_type & N_EXT)
3730 if((nlist[i].n_type & N_TYPE) == N_UNDF
3731 && (nlist[i].n_value == 0))
3741 return ocAllocateSymbolExtras(oc, max - min + 1, min);
3746 lc = (struct load_command *) ( ((char *)lc) + lc->cmdsize );
3748 return ocAllocateSymbolExtras(oc,0,0);
3751 #ifdef x86_64_HOST_ARCH
3752 static int ocAllocateSymbolExtras_MachO(ObjectCode* oc)
3754 struct mach_header *header = (struct mach_header *) oc->image;
3755 struct load_command *lc = (struct load_command *) (header + 1);
3758 for( i = 0; i < header->ncmds; i++ )
3760 if( lc->cmd == LC_SYMTAB )
3762 // Just allocate one entry for every symbol
3763 struct symtab_command *symLC = (struct symtab_command *) lc;
3765 return ocAllocateSymbolExtras(oc, symLC->nsyms, 0);
3768 lc = (struct load_command *) ( ((char *)lc) + lc->cmdsize );
3770 return ocAllocateSymbolExtras(oc,0,0);
3774 static int ocVerifyImage_MachO(ObjectCode* oc)
3776 char *image = (char*) oc->image;
3777 struct mach_header *header = (struct mach_header*) image;
3779 #if x86_64_TARGET_ARCH || powerpc64_TARGET_ARCH
3780 if(header->magic != MH_MAGIC_64)
3783 if(header->magic != MH_MAGIC)
3786 // FIXME: do some more verifying here
3790 static int resolveImports(
3793 struct symtab_command *symLC,
3794 struct section *sect, // ptr to lazy or non-lazy symbol pointer section
3795 unsigned long *indirectSyms,
3796 struct nlist *nlist)
3799 size_t itemSize = 4;
3802 int isJumpTable = 0;
3803 if(!strcmp(sect->sectname,"__jump_table"))
3807 ASSERT(sect->reserved2 == itemSize);
3811 for(i=0; i*itemSize < sect->size;i++)
3813 // according to otool, reserved1 contains the first index into the indirect symbol table
3814 struct nlist *symbol = &nlist[indirectSyms[sect->reserved1+i]];
3815 char *nm = image + symLC->stroff + symbol->n_un.n_strx;
3818 if((symbol->n_type & N_TYPE) == N_UNDF
3819 && (symbol->n_type & N_EXT) && (symbol->n_value != 0))
3820 addr = (void*) (symbol->n_value);
3821 else if((addr = lookupLocalSymbol(oc,nm)) != NULL)
3824 addr = lookupSymbol(nm);
3827 errorBelch("\n%s: unknown symbol `%s'", oc->fileName, nm);
3835 checkProddableBlock(oc,image + sect->offset + i*itemSize);
3836 *(image + sect->offset + i*itemSize) = 0xe9; // jmp
3837 *(unsigned*)(image + sect->offset + i*itemSize + 1)
3838 = (char*)addr - (image + sect->offset + i*itemSize + 5);
3843 checkProddableBlock(oc,((void**)(image + sect->offset)) + i);
3844 ((void**)(image + sect->offset))[i] = addr;
3851 static unsigned long relocateAddress(
3854 struct section* sections,
3855 unsigned long address)
3858 for(i = 0; i < nSections; i++)
3860 if(sections[i].addr <= address
3861 && address < sections[i].addr + sections[i].size)
3863 return (unsigned long)oc->image
3864 + sections[i].offset + address - sections[i].addr;
3867 barf("Invalid Mach-O file:"
3868 "Address out of bounds while relocating object file");
3872 static int relocateSection(
3875 struct symtab_command *symLC, struct nlist *nlist,
3876 int nSections, struct section* sections, struct section *sect)
3878 struct relocation_info *relocs;
3881 if(!strcmp(sect->sectname,"__la_symbol_ptr"))
3883 else if(!strcmp(sect->sectname,"__nl_symbol_ptr"))
3885 else if(!strcmp(sect->sectname,"__la_sym_ptr2"))
3887 else if(!strcmp(sect->sectname,"__la_sym_ptr3"))
3891 relocs = (struct relocation_info*) (image + sect->reloff);
3895 #ifdef x86_64_HOST_ARCH
3896 struct relocation_info *reloc = &relocs[i];
3898 char *thingPtr = image + sect->offset + reloc->r_address;
3902 int type = reloc->r_type;
3904 checkProddableBlock(oc,thingPtr);
3905 switch(reloc->r_length)
3908 thing = *(uint8_t*)thingPtr;
3909 baseValue = (uint64_t)thingPtr + 1;
3912 thing = *(uint16_t*)thingPtr;
3913 baseValue = (uint64_t)thingPtr + 2;
3916 thing = *(uint32_t*)thingPtr;
3917 baseValue = (uint64_t)thingPtr + 4;
3920 thing = *(uint64_t*)thingPtr;
3921 baseValue = (uint64_t)thingPtr + 8;
3924 barf("Unknown size.");
3927 if(type == X86_64_RELOC_GOT
3928 || type == X86_64_RELOC_GOT_LOAD)
3930 ASSERT(reloc->r_extern);
3931 value = (uint64_t) &makeSymbolExtra(oc, reloc->r_symbolnum, value)->addr;
3933 type = X86_64_RELOC_SIGNED;
3935 else if(reloc->r_extern)
3937 struct nlist *symbol = &nlist[reloc->r_symbolnum];
3938 char *nm = image + symLC->stroff + symbol->n_un.n_strx;
3939 if(symbol->n_value == 0)
3940 value = (uint64_t) lookupSymbol(nm);
3942 value = relocateAddress(oc, nSections, sections,
3947 value = sections[reloc->r_symbolnum-1].offset
3948 - sections[reloc->r_symbolnum-1].addr
3952 if(type == X86_64_RELOC_BRANCH)
3954 if((int32_t)(value - baseValue) != (int64_t)(value - baseValue))
3956 ASSERT(reloc->r_extern);
3957 value = (uint64_t) &makeSymbolExtra(oc, reloc->r_symbolnum, value)
3960 ASSERT((int32_t)(value - baseValue) == (int64_t)(value - baseValue));
3961 type = X86_64_RELOC_SIGNED;
3966 case X86_64_RELOC_UNSIGNED:
3967 ASSERT(!reloc->r_pcrel);
3970 case X86_64_RELOC_SIGNED:
3971 ASSERT(reloc->r_pcrel);
3972 thing += value - baseValue;
3974 case X86_64_RELOC_SUBTRACTOR:
3975 ASSERT(!reloc->r_pcrel);
3979 barf("unkown relocation");
3982 switch(reloc->r_length)
3985 *(uint8_t*)thingPtr = thing;
3988 *(uint16_t*)thingPtr = thing;
3991 *(uint32_t*)thingPtr = thing;
3994 *(uint64_t*)thingPtr = thing;
3998 if(relocs[i].r_address & R_SCATTERED)
4000 struct scattered_relocation_info *scat =
4001 (struct scattered_relocation_info*) &relocs[i];
4005 if(scat->r_length == 2)
4007 unsigned long word = 0;
4008 unsigned long* wordPtr = (unsigned long*) (image + sect->offset + scat->r_address);
4009 checkProddableBlock(oc,wordPtr);
4011 // Note on relocation types:
4012 // i386 uses the GENERIC_RELOC_* types,
4013 // while ppc uses special PPC_RELOC_* types.
4014 // *_RELOC_VANILLA and *_RELOC_PAIR have the same value
4015 // in both cases, all others are different.
4016 // Therefore, we use GENERIC_RELOC_VANILLA
4017 // and GENERIC_RELOC_PAIR instead of the PPC variants,
4018 // and use #ifdefs for the other types.
4020 // Step 1: Figure out what the relocated value should be
4021 if(scat->r_type == GENERIC_RELOC_VANILLA)
4023 word = *wordPtr + (unsigned long) relocateAddress(
4030 #ifdef powerpc_HOST_ARCH
4031 else if(scat->r_type == PPC_RELOC_SECTDIFF
4032 || scat->r_type == PPC_RELOC_LO16_SECTDIFF
4033 || scat->r_type == PPC_RELOC_HI16_SECTDIFF
4034 || scat->r_type == PPC_RELOC_HA16_SECTDIFF)
4036 else if(scat->r_type == GENERIC_RELOC_SECTDIFF)
4039 struct scattered_relocation_info *pair =
4040 (struct scattered_relocation_info*) &relocs[i+1];
4042 if(!pair->r_scattered || pair->r_type != GENERIC_RELOC_PAIR)
4043 barf("Invalid Mach-O file: "
4044 "RELOC_*_SECTDIFF not followed by RELOC_PAIR");
4046 word = (unsigned long)
4047 (relocateAddress(oc, nSections, sections, scat->r_value)
4048 - relocateAddress(oc, nSections, sections, pair->r_value));
4051 #ifdef powerpc_HOST_ARCH
4052 else if(scat->r_type == PPC_RELOC_HI16
4053 || scat->r_type == PPC_RELOC_LO16
4054 || scat->r_type == PPC_RELOC_HA16
4055 || scat->r_type == PPC_RELOC_LO14)
4056 { // these are generated by label+offset things
4057 struct relocation_info *pair = &relocs[i+1];
4058 if((pair->r_address & R_SCATTERED) || pair->r_type != PPC_RELOC_PAIR)
4059 barf("Invalid Mach-O file: "
4060 "PPC_RELOC_* not followed by PPC_RELOC_PAIR");
4062 if(scat->r_type == PPC_RELOC_LO16)
4064 word = ((unsigned short*) wordPtr)[1];
4065 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
4067 else if(scat->r_type == PPC_RELOC_LO14)
4069 barf("Unsupported Relocation: PPC_RELOC_LO14");
4070 word = ((unsigned short*) wordPtr)[1] & 0xFFFC;
4071 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
4073 else if(scat->r_type == PPC_RELOC_HI16)
4075 word = ((unsigned short*) wordPtr)[1] << 16;
4076 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF);
4078 else if(scat->r_type == PPC_RELOC_HA16)
4080 word = ((unsigned short*) wordPtr)[1] << 16;
4081 word += ((short)relocs[i+1].r_address & (short)0xFFFF);
4085 word += (unsigned long) relocateAddress(oc, nSections, sections, scat->r_value)
4092 continue; // ignore the others
4094 #ifdef powerpc_HOST_ARCH
4095 if(scat->r_type == GENERIC_RELOC_VANILLA
4096 || scat->r_type == PPC_RELOC_SECTDIFF)
4098 if(scat->r_type == GENERIC_RELOC_VANILLA
4099 || scat->r_type == GENERIC_RELOC_SECTDIFF)
4104 #ifdef powerpc_HOST_ARCH
4105 else if(scat->r_type == PPC_RELOC_LO16_SECTDIFF || scat->r_type == PPC_RELOC_LO16)
4107 ((unsigned short*) wordPtr)[1] = word & 0xFFFF;
4109 else if(scat->r_type == PPC_RELOC_HI16_SECTDIFF || scat->r_type == PPC_RELOC_HI16)
4111 ((unsigned short*) wordPtr)[1] = (word >> 16) & 0xFFFF;
4113 else if(scat->r_type == PPC_RELOC_HA16_SECTDIFF || scat->r_type == PPC_RELOC_HA16)
4115 ((unsigned short*) wordPtr)[1] = ((word >> 16) & 0xFFFF)
4116 + ((word & (1<<15)) ? 1 : 0);
4122 continue; // FIXME: I hope it's OK to ignore all the others.
4126 struct relocation_info *reloc = &relocs[i];
4127 if(reloc->r_pcrel && !reloc->r_extern)
4130 if(reloc->r_length == 2)
4132 unsigned long word = 0;
4133 #ifdef powerpc_HOST_ARCH
4134 unsigned long jumpIsland = 0;
4135 long offsetToJumpIsland = 0xBADBAD42; // initialise to bad value
4136 // to avoid warning and to catch
4140 unsigned long* wordPtr = (unsigned long*) (image + sect->offset + reloc->r_address);
4141 checkProddableBlock(oc,wordPtr);
4143 if(reloc->r_type == GENERIC_RELOC_VANILLA)
4147 #ifdef powerpc_HOST_ARCH
4148 else if(reloc->r_type == PPC_RELOC_LO16)
4150 word = ((unsigned short*) wordPtr)[1];
4151 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
4153 else if(reloc->r_type == PPC_RELOC_HI16)
4155 word = ((unsigned short*) wordPtr)[1] << 16;
4156 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF);
4158 else if(reloc->r_type == PPC_RELOC_HA16)
4160 word = ((unsigned short*) wordPtr)[1] << 16;
4161 word += ((short)relocs[i+1].r_address & (short)0xFFFF);
4163 else if(reloc->r_type == PPC_RELOC_BR24)
4166 word = (word & 0x03FFFFFC) | ((word & 0x02000000) ? 0xFC000000 : 0);
4170 if(!reloc->r_extern)
4173 sections[reloc->r_symbolnum-1].offset
4174 - sections[reloc->r_symbolnum-1].addr
4181 struct nlist *symbol = &nlist[reloc->r_symbolnum];
4182 char *nm = image + symLC->stroff + symbol->n_un.n_strx;
4183 void *symbolAddress = lookupSymbol(nm);
4186 errorBelch("\nunknown symbol `%s'", nm);
4192 #ifdef powerpc_HOST_ARCH
4193 // In the .o file, this should be a relative jump to NULL
4194 // and we'll change it to a relative jump to the symbol
4195 ASSERT(-word == reloc->r_address);
4196 jumpIsland = (unsigned long)
4197 &makeSymbolExtra(oc,
4199 (unsigned long) symbolAddress)
4203 offsetToJumpIsland = word + jumpIsland
4204 - (((long)image) + sect->offset - sect->addr);
4207 word += (unsigned long) symbolAddress
4208 - (((long)image) + sect->offset - sect->addr);
4212 word += (unsigned long) symbolAddress;
4216 if(reloc->r_type == GENERIC_RELOC_VANILLA)
4221 #ifdef powerpc_HOST_ARCH
4222 else if(reloc->r_type == PPC_RELOC_LO16)
4224 ((unsigned short*) wordPtr)[1] = word & 0xFFFF;
4227 else if(reloc->r_type == PPC_RELOC_HI16)
4229 ((unsigned short*) wordPtr)[1] = (word >> 16) & 0xFFFF;
4232 else if(reloc->r_type == PPC_RELOC_HA16)
4234 ((unsigned short*) wordPtr)[1] = ((word >> 16) & 0xFFFF)
4235 + ((word & (1<<15)) ? 1 : 0);
4238 else if(reloc->r_type == PPC_RELOC_BR24)
4240 if((long)word > (long)0x01FFFFFF || (long)word < (long)0xFFE00000)
4242 // The branch offset is too large.
4243 // Therefore, we try to use a jump island.
4246 barf("unconditional relative branch out of range: "
4247 "no jump island available");
4250 word = offsetToJumpIsland;
4251 if((long)word > (long)0x01FFFFFF || (long)word < (long)0xFFE00000)
4252 barf("unconditional relative branch out of range: "
4253 "jump island out of range");
4255 *wordPtr = (*wordPtr & 0xFC000003) | (word & 0x03FFFFFC);
4260 barf("\nunknown relocation %d",reloc->r_type);
4268 static int ocGetNames_MachO(ObjectCode* oc)
4270 char *image = (char*) oc->image;
4271 struct mach_header *header = (struct mach_header*) image;
4272 struct load_command *lc = (struct load_command*) (image + sizeof(struct mach_header));
4273 unsigned i,curSymbol = 0;
4274 struct segment_command *segLC = NULL;
4275 struct section *sections;
4276 struct symtab_command *symLC = NULL;
4277 struct nlist *nlist;
4278 unsigned long commonSize = 0;
4279 char *commonStorage = NULL;
4280 unsigned long commonCounter;
4282 for(i=0;i<header->ncmds;i++)
4284 if(lc->cmd == LC_SEGMENT || lc->cmd == LC_SEGMENT_64)
4285 segLC = (struct segment_command*) lc;
4286 else if(lc->cmd == LC_SYMTAB)
4287 symLC = (struct symtab_command*) lc;
4288 lc = (struct load_command *) ( ((char*)lc) + lc->cmdsize );
4291 sections = (struct section*) (segLC+1);
4292 nlist = symLC ? (struct nlist*) (image + symLC->symoff)
4296 barf("ocGetNames_MachO: no segment load command");
4298 for(i=0;i<segLC->nsects;i++)
4300 if(sections[i].size == 0)
4303 if((sections[i].flags & SECTION_TYPE) == S_ZEROFILL)
4305 char * zeroFillArea = stgCallocBytes(1,sections[i].size,
4306 "ocGetNames_MachO(common symbols)");
4307 sections[i].offset = zeroFillArea - image;
4310 if(!strcmp(sections[i].sectname,"__text"))
4311 addSection(oc, SECTIONKIND_CODE_OR_RODATA,
4312 (void*) (image + sections[i].offset),
4313 (void*) (image + sections[i].offset + sections[i].size));
4314 else if(!strcmp(sections[i].sectname,"__const"))
4315 addSection(oc, SECTIONKIND_RWDATA,
4316 (void*) (image + sections[i].offset),
4317 (void*) (image + sections[i].offset + sections[i].size));
4318 else if(!strcmp(sections[i].sectname,"__data"))
4319 addSection(oc, SECTIONKIND_RWDATA,
4320 (void*) (image + sections[i].offset),
4321 (void*) (image + sections[i].offset + sections[i].size));
4322 else if(!strcmp(sections[i].sectname,"__bss")
4323 || !strcmp(sections[i].sectname,"__common"))
4324 addSection(oc, SECTIONKIND_RWDATA,
4325 (void*) (image + sections[i].offset),
4326 (void*) (image + sections[i].offset + sections[i].size));
4328 addProddableBlock(oc, (void*) (image + sections[i].offset),
4332 // count external symbols defined here
4336 for(i=0;i<symLC->nsyms;i++)
4338 if(nlist[i].n_type & N_STAB)
4340 else if(nlist[i].n_type & N_EXT)
4342 if((nlist[i].n_type & N_TYPE) == N_UNDF
4343 && (nlist[i].n_value != 0))
4345 commonSize += nlist[i].n_value;
4348 else if((nlist[i].n_type & N_TYPE) == N_SECT)
4353 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
4354 "ocGetNames_MachO(oc->symbols)");
4358 for(i=0;i<symLC->nsyms;i++)
4360 if(nlist[i].n_type & N_STAB)
4362 else if((nlist[i].n_type & N_TYPE) == N_SECT)
4364 if(nlist[i].n_type & N_EXT)
4366 char *nm = image + symLC->stroff + nlist[i].n_un.n_strx;
4367 if((nlist[i].n_desc & N_WEAK_DEF) && lookupSymbol(nm))
4368 ; // weak definition, and we already have a definition
4371 ghciInsertStrHashTable(oc->fileName, symhash, nm,
4373 + sections[nlist[i].n_sect-1].offset
4374 - sections[nlist[i].n_sect-1].addr
4375 + nlist[i].n_value);
4376 oc->symbols[curSymbol++] = nm;
4383 commonStorage = stgCallocBytes(1,commonSize,"ocGetNames_MachO(common symbols)");
4384 commonCounter = (unsigned long)commonStorage;
4387 for(i=0;i<symLC->nsyms;i++)
4389 if((nlist[i].n_type & N_TYPE) == N_UNDF
4390 && (nlist[i].n_type & N_EXT) && (nlist[i].n_value != 0))
4392 char *nm = image + symLC->stroff + nlist[i].n_un.n_strx;
4393 unsigned long sz = nlist[i].n_value;
4395 nlist[i].n_value = commonCounter;
4397 ghciInsertStrHashTable(oc->fileName, symhash, nm,
4398 (void*)commonCounter);
4399 oc->symbols[curSymbol++] = nm;
4401 commonCounter += sz;
4408 static int ocResolve_MachO(ObjectCode* oc)
4410 char *image = (char*) oc->image;
4411 struct mach_header *header = (struct mach_header*) image;
4412 struct load_command *lc = (struct load_command*) (image + sizeof(struct mach_header));
4414 struct segment_command *segLC = NULL;
4415 struct section *sections;
4416 struct symtab_command *symLC = NULL;
4417 struct dysymtab_command *dsymLC = NULL;
4418 struct nlist *nlist;
4420 for(i=0;i<header->ncmds;i++)
4422 if(lc->cmd == LC_SEGMENT || lc->cmd == LC_SEGMENT_64)
4423 segLC = (struct segment_command*) lc;
4424 else if(lc->cmd == LC_SYMTAB)
4425 symLC = (struct symtab_command*) lc;
4426 else if(lc->cmd == LC_DYSYMTAB)
4427 dsymLC = (struct dysymtab_command*) lc;
4428 lc = (struct load_command *) ( ((char*)lc) + lc->cmdsize );
4431 sections = (struct section*) (segLC+1);
4432 nlist = symLC ? (struct nlist*) (image + symLC->symoff)
4437 unsigned long *indirectSyms
4438 = (unsigned long*) (image + dsymLC->indirectsymoff);
4440 for(i=0;i<segLC->nsects;i++)
4442 if( !strcmp(sections[i].sectname,"__la_symbol_ptr")
4443 || !strcmp(sections[i].sectname,"__la_sym_ptr2")
4444 || !strcmp(sections[i].sectname,"__la_sym_ptr3"))
4446 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4449 else if(!strcmp(sections[i].sectname,"__nl_symbol_ptr")
4450 || !strcmp(sections[i].sectname,"__pointers"))
4452 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4455 else if(!strcmp(sections[i].sectname,"__jump_table"))
4457 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4463 for(i=0;i<segLC->nsects;i++)
4465 if(!relocateSection(oc,image,symLC,nlist,segLC->nsects,sections,§ions[i]))
4469 /* Free the local symbol table; we won't need it again. */
4470 freeHashTable(oc->lochash, NULL);
4473 #if defined (powerpc_HOST_ARCH)
4474 ocFlushInstructionCache( oc );
4480 #ifdef powerpc_HOST_ARCH
4482 * The Mach-O object format uses leading underscores. But not everywhere.
4483 * There is a small number of runtime support functions defined in
4484 * libcc_dynamic.a whose name does not have a leading underscore.
4485 * As a consequence, we can't get their address from C code.
4486 * We have to use inline assembler just to take the address of a function.
4490 static void machoInitSymbolsWithoutUnderscore()
4492 extern void* symbolsWithoutUnderscore[];
4493 void **p = symbolsWithoutUnderscore;
4494 __asm__ volatile(".globl _symbolsWithoutUnderscore\n.data\n_symbolsWithoutUnderscore:");
4498 __asm__ volatile(".long " # x);
4500 RTS_MACHO_NOUNDERLINE_SYMBOLS
4502 __asm__ volatile(".text");
4506 ghciInsertStrHashTable("(GHCi built-in symbols)", symhash, #x, *p++);
4508 RTS_MACHO_NOUNDERLINE_SYMBOLS
4515 * Figure out by how much to shift the entire Mach-O file in memory
4516 * when loading so that its single segment ends up 16-byte-aligned
4518 static int machoGetMisalignment( FILE * f )
4520 struct mach_header header;
4523 fread(&header, sizeof(header), 1, f);
4526 #if x86_64_TARGET_ARCH || powerpc64_TARGET_ARCH
4527 if(header.magic != MH_MAGIC_64)
4530 if(header.magic != MH_MAGIC)
4534 misalignment = (header.sizeofcmds + sizeof(header))
4537 return misalignment ? (16 - misalignment) : 0;