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 SymX(rts_stop_next_breakpoint) \
722 SymX(rts_stop_on_exception) \
723 RTS_USER_SIGNALS_SYMBOLS
725 #ifdef SUPPORT_LONG_LONGS
726 #define RTS_LONG_LONG_SYMS \
727 SymX(int64ToIntegerzh_fast) \
728 SymX(word64ToIntegerzh_fast)
730 #define RTS_LONG_LONG_SYMS /* nothing */
733 // 64-bit support functions in libgcc.a
734 #if defined(__GNUC__) && SIZEOF_VOID_P <= 4
735 #define RTS_LIBGCC_SYMBOLS \
745 #elif defined(ia64_HOST_ARCH)
746 #define RTS_LIBGCC_SYMBOLS \
754 #define RTS_LIBGCC_SYMBOLS
757 #if defined(darwin_HOST_OS) && defined(powerpc_HOST_ARCH)
758 // Symbols that don't have a leading underscore
759 // on Mac OS X. They have to receive special treatment,
760 // see machoInitSymbolsWithoutUnderscore()
761 #define RTS_MACHO_NOUNDERLINE_SYMBOLS \
766 /* entirely bogus claims about types of these symbols */
767 #define Sym(vvv) extern void vvv(void);
768 #define SymX(vvv) /**/
769 #define SymX_redirect(vvv,xxx) /**/
773 RTS_POSIX_ONLY_SYMBOLS
774 RTS_MINGW_ONLY_SYMBOLS
775 RTS_CYGWIN_ONLY_SYMBOLS
776 RTS_DARWIN_ONLY_SYMBOLS
782 #ifdef LEADING_UNDERSCORE
783 #define MAYBE_LEADING_UNDERSCORE_STR(s) ("_" s)
785 #define MAYBE_LEADING_UNDERSCORE_STR(s) (s)
788 #define Sym(vvv) { MAYBE_LEADING_UNDERSCORE_STR(#vvv), \
790 #define SymX(vvv) Sym(vvv)
792 // SymX_redirect allows us to redirect references to one symbol to
793 // another symbol. See newCAF/newDynCAF for an example.
794 #define SymX_redirect(vvv,xxx) \
795 { MAYBE_LEADING_UNDERSCORE_STR(#vvv), \
798 static RtsSymbolVal rtsSyms[] = {
802 RTS_POSIX_ONLY_SYMBOLS
803 RTS_MINGW_ONLY_SYMBOLS
804 RTS_CYGWIN_ONLY_SYMBOLS
805 RTS_DARWIN_ONLY_SYMBOLS
807 #if defined(darwin_HOST_OS) && defined(i386_HOST_ARCH)
808 // dyld stub code contains references to this,
809 // but it should never be called because we treat
810 // lazy pointers as nonlazy.
811 { "dyld_stub_binding_helper", (void*)0xDEADBEEF },
813 { 0, 0 } /* sentinel */
818 /* -----------------------------------------------------------------------------
819 * Insert symbols into hash tables, checking for duplicates.
822 static void ghciInsertStrHashTable ( char* obj_name,
828 if (lookupHashTable(table, (StgWord)key) == NULL)
830 insertStrHashTable(table, (StgWord)key, data);
835 "GHCi runtime linker: fatal error: I found a duplicate definition for symbol\n"
837 "whilst processing object file\n"
839 "This could be caused by:\n"
840 " * Loading two different object files which export the same symbol\n"
841 " * Specifying the same object file twice on the GHCi command line\n"
842 " * An incorrect `package.conf' entry, causing some object to be\n"
844 "GHCi cannot safely continue in this situation. Exiting now. Sorry.\n"
851 /* -----------------------------------------------------------------------------
852 * initialize the object linker
856 static int linker_init_done = 0 ;
858 #if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
859 static void *dl_prog_handle;
867 /* Make initLinker idempotent, so we can call it
868 before evey relevant operation; that means we
869 don't need to initialise the linker separately */
870 if (linker_init_done == 1) { return; } else {
871 linker_init_done = 1;
874 stablehash = allocStrHashTable();
875 symhash = allocStrHashTable();
877 /* populate the symbol table with stuff from the RTS */
878 for (sym = rtsSyms; sym->lbl != NULL; sym++) {
879 ghciInsertStrHashTable("(GHCi built-in symbols)",
880 symhash, sym->lbl, sym->addr);
882 # if defined(OBJFORMAT_MACHO) && defined(powerpc_HOST_ARCH)
883 machoInitSymbolsWithoutUnderscore();
886 # if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
887 # if defined(RTLD_DEFAULT)
888 dl_prog_handle = RTLD_DEFAULT;
890 dl_prog_handle = dlopen(NULL, RTLD_LAZY);
891 # endif /* RTLD_DEFAULT */
895 /* -----------------------------------------------------------------------------
896 * Loading DLL or .so dynamic libraries
897 * -----------------------------------------------------------------------------
899 * Add a DLL from which symbols may be found. In the ELF case, just
900 * do RTLD_GLOBAL-style add, so no further messing around needs to
901 * happen in order that symbols in the loaded .so are findable --
902 * lookupSymbol() will subsequently see them by dlsym on the program's
903 * dl-handle. Returns NULL if success, otherwise ptr to an err msg.
905 * In the PEi386 case, open the DLLs and put handles to them in a
906 * linked list. When looking for a symbol, try all handles in the
907 * list. This means that we need to load even DLLs that are guaranteed
908 * to be in the ghc.exe image already, just so we can get a handle
909 * to give to loadSymbol, so that we can find the symbols. For such
910 * libraries, the LoadLibrary call should be a no-op except for returning
915 #if defined(OBJFORMAT_PEi386)
916 /* A record for storing handles into DLLs. */
921 struct _OpenedDLL* next;
926 /* A list thereof. */
927 static OpenedDLL* opened_dlls = NULL;
931 addDLL( char *dll_name )
933 # if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
934 /* ------------------- ELF DLL loader ------------------- */
940 hdl= dlopen(dll_name, RTLD_NOW | RTLD_GLOBAL);
943 /* dlopen failed; return a ptr to the error msg. */
945 if (errmsg == NULL) errmsg = "addDLL: unknown error";
952 # elif defined(OBJFORMAT_PEi386)
953 /* ------------------- Win32 DLL loader ------------------- */
961 /* debugBelch("\naddDLL; dll_name = `%s'\n", dll_name); */
963 /* See if we've already got it, and ignore if so. */
964 for (o_dll = opened_dlls; o_dll != NULL; o_dll = o_dll->next) {
965 if (0 == strcmp(o_dll->name, dll_name))
969 /* The file name has no suffix (yet) so that we can try
970 both foo.dll and foo.drv
972 The documentation for LoadLibrary says:
973 If no file name extension is specified in the lpFileName
974 parameter, the default library extension .dll is
975 appended. However, the file name string can include a trailing
976 point character (.) to indicate that the module name has no
979 buf = stgMallocBytes(strlen(dll_name) + 10, "addDLL");
980 sprintf(buf, "%s.DLL", dll_name);
981 instance = LoadLibrary(buf);
982 if (instance == NULL) {
983 sprintf(buf, "%s.DRV", dll_name); // KAA: allow loading of drivers (like winspool.drv)
984 instance = LoadLibrary(buf);
985 if (instance == NULL) {
988 /* LoadLibrary failed; return a ptr to the error msg. */
989 return "addDLL: unknown error";
994 /* Add this DLL to the list of DLLs in which to search for symbols. */
995 o_dll = stgMallocBytes( sizeof(OpenedDLL), "addDLL" );
996 o_dll->name = stgMallocBytes(1+strlen(dll_name), "addDLL");
997 strcpy(o_dll->name, dll_name);
998 o_dll->instance = instance;
999 o_dll->next = opened_dlls;
1000 opened_dlls = o_dll;
1004 barf("addDLL: not implemented on this platform");
1008 /* -----------------------------------------------------------------------------
1009 * insert a stable symbol in the hash table
1013 insertStableSymbol(char* obj_name, char* key, StgPtr p)
1015 ghciInsertStrHashTable(obj_name, stablehash, key, getStablePtr(p));
1019 /* -----------------------------------------------------------------------------
1020 * insert a symbol in the hash table
1023 insertSymbol(char* obj_name, char* key, void* data)
1025 ghciInsertStrHashTable(obj_name, symhash, key, data);
1028 /* -----------------------------------------------------------------------------
1029 * lookup a symbol in the hash table
1032 lookupSymbol( char *lbl )
1036 ASSERT(symhash != NULL);
1037 val = lookupStrHashTable(symhash, lbl);
1040 # if defined(OBJFORMAT_ELF)
1041 # if defined(x86_64_HOST_ARCH)
1042 val = dlsym(dl_prog_handle, lbl);
1043 if (val >= (void *)0x80000000) {
1045 new_val = x86_64_high_symbol(lbl, val);
1046 IF_DEBUG(linker,debugBelch("lookupSymbol: relocating out of range symbol: %s = %p, now %p\n", lbl, val, new_val));
1052 return dlsym(dl_prog_handle, lbl);
1054 # elif defined(OBJFORMAT_MACHO)
1055 if(NSIsSymbolNameDefined(lbl)) {
1056 NSSymbol symbol = NSLookupAndBindSymbol(lbl);
1057 return NSAddressOfSymbol(symbol);
1061 # elif defined(OBJFORMAT_PEi386)
1064 for (o_dll = opened_dlls; o_dll != NULL; o_dll = o_dll->next) {
1065 /* debugBelch("look in %s for %s\n", o_dll->name, lbl); */
1066 if (lbl[0] == '_') {
1067 /* HACK: if the name has an initial underscore, try stripping
1068 it off & look that up first. I've yet to verify whether there's
1069 a Rule that governs whether an initial '_' *should always* be
1070 stripped off when mapping from import lib name to the DLL name.
1072 sym = GetProcAddress(o_dll->instance, (lbl+1));
1074 /*debugBelch("found %s in %s\n", lbl+1,o_dll->name);*/
1078 sym = GetProcAddress(o_dll->instance, lbl);
1080 /*debugBelch("found %s in %s\n", lbl,o_dll->name);*/
1095 __attribute((unused))
1097 lookupLocalSymbol( ObjectCode* oc, char *lbl )
1101 val = lookupStrHashTable(oc->lochash, lbl);
1111 /* -----------------------------------------------------------------------------
1112 * Debugging aid: look in GHCi's object symbol tables for symbols
1113 * within DELTA bytes of the specified address, and show their names.
1116 void ghci_enquire ( char* addr );
1118 void ghci_enquire ( char* addr )
1123 const int DELTA = 64;
1128 for (oc = objects; oc; oc = oc->next) {
1129 for (i = 0; i < oc->n_symbols; i++) {
1130 sym = oc->symbols[i];
1131 if (sym == NULL) continue;
1132 // debugBelch("enquire %p %p\n", sym, oc->lochash);
1134 if (oc->lochash != NULL) {
1135 a = lookupStrHashTable(oc->lochash, sym);
1138 a = lookupStrHashTable(symhash, sym);
1141 // debugBelch("ghci_enquire: can't find %s\n", sym);
1143 else if (addr-DELTA <= a && a <= addr+DELTA) {
1144 debugBelch("%p + %3d == `%s'\n", addr, (int)(a - addr), sym);
1151 #ifdef ia64_HOST_ARCH
1152 static unsigned int PLTSize(void);
1155 /* -----------------------------------------------------------------------------
1156 * Load an obj (populate the global symbol table, but don't resolve yet)
1158 * Returns: 1 if ok, 0 on error.
1161 loadObj( char *path )
1168 void *map_addr = NULL;
1174 /* debugBelch("loadObj %s\n", path ); */
1176 /* Check that we haven't already loaded this object.
1177 Ignore requests to load multiple times */
1181 for (o = objects; o; o = o->next) {
1182 if (0 == strcmp(o->fileName, path)) {
1184 break; /* don't need to search further */
1188 IF_DEBUG(linker, debugBelch(
1189 "GHCi runtime linker: warning: looks like you're trying to load the\n"
1190 "same object file twice:\n"
1192 "GHCi will ignore this, but be warned.\n"
1194 return 1; /* success */
1198 oc = stgMallocBytes(sizeof(ObjectCode), "loadObj(oc)");
1200 # if defined(OBJFORMAT_ELF)
1201 oc->formatName = "ELF";
1202 # elif defined(OBJFORMAT_PEi386)
1203 oc->formatName = "PEi386";
1204 # elif defined(OBJFORMAT_MACHO)
1205 oc->formatName = "Mach-O";
1208 barf("loadObj: not implemented on this platform");
1211 r = stat(path, &st);
1212 if (r == -1) { return 0; }
1214 /* sigh, strdup() isn't a POSIX function, so do it the long way */
1215 oc->fileName = stgMallocBytes( strlen(path)+1, "loadObj" );
1216 strcpy(oc->fileName, path);
1218 oc->fileSize = st.st_size;
1220 oc->sections = NULL;
1221 oc->lochash = allocStrHashTable();
1222 oc->proddables = NULL;
1224 /* chain it onto the list of objects */
1229 #define ROUND_UP(x,size) ((x + size - 1) & ~(size - 1))
1231 /* On many architectures malloc'd memory isn't executable, so we need to use mmap. */
1233 #if defined(openbsd_HOST_OS)
1234 fd = open(path, O_RDONLY, S_IRUSR);
1236 fd = open(path, O_RDONLY);
1239 barf("loadObj: can't open `%s'", path);
1241 pagesize = getpagesize();
1243 #ifdef ia64_HOST_ARCH
1244 /* The PLT needs to be right before the object */
1245 n = ROUND_UP(PLTSize(), pagesize);
1246 oc->plt = mmap(NULL, n, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
1247 if (oc->plt == MAP_FAILED)
1248 barf("loadObj: can't allocate PLT");
1251 map_addr = oc->plt + n;
1254 n = ROUND_UP(oc->fileSize, pagesize);
1256 /* Link objects into the lower 2Gb on x86_64. GHC assumes the
1257 * small memory model on this architecture (see gcc docs,
1260 #ifdef x86_64_HOST_ARCH
1261 #define EXTRA_MAP_FLAGS MAP_32BIT
1263 #define EXTRA_MAP_FLAGS 0
1266 oc->image = mmap(map_addr, n, PROT_EXEC|PROT_READ|PROT_WRITE,
1267 MAP_PRIVATE|EXTRA_MAP_FLAGS, fd, 0);
1268 if (oc->image == MAP_FAILED)
1269 barf("loadObj: can't map `%s'", path);
1273 #else /* !USE_MMAP */
1275 /* load the image into memory */
1276 f = fopen(path, "rb");
1278 barf("loadObj: can't read `%s'", path);
1280 # if defined(mingw32_HOST_OS)
1281 // TODO: We would like to use allocateExec here, but allocateExec
1282 // cannot currently allocate blocks large enough.
1283 oc->image = VirtualAlloc(NULL, oc->fileSize, MEM_RESERVE | MEM_COMMIT,
1284 PAGE_EXECUTE_READWRITE);
1285 # elif defined(darwin_HOST_OS)
1286 // In a Mach-O .o file, all sections can and will be misaligned
1287 // if the total size of the headers is not a multiple of the
1288 // desired alignment. This is fine for .o files that only serve
1289 // as input for the static linker, but it's not fine for us,
1290 // as SSE (used by gcc for floating point) and Altivec require
1291 // 16-byte alignment.
1292 // We calculate the correct alignment from the header before
1293 // reading the file, and then we misalign oc->image on purpose so
1294 // that the actual sections end up aligned again.
1295 oc->misalignment = machoGetMisalignment(f);
1296 oc->image = stgMallocBytes(oc->fileSize + oc->misalignment, "loadObj(image)");
1297 oc->image += oc->misalignment;
1299 oc->image = stgMallocBytes(oc->fileSize, "loadObj(image)");
1302 n = fread ( oc->image, 1, oc->fileSize, f );
1303 if (n != oc->fileSize)
1304 barf("loadObj: error whilst reading `%s'", path);
1307 #endif /* USE_MMAP */
1309 # if defined(OBJFORMAT_MACHO) && (defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH))
1310 r = ocAllocateSymbolExtras_MachO ( oc );
1311 if (!r) { return r; }
1312 # elif defined(OBJFORMAT_ELF) && defined(powerpc_HOST_ARCH)
1313 r = ocAllocateSymbolExtras_ELF ( oc );
1314 if (!r) { return r; }
1317 /* verify the in-memory image */
1318 # if defined(OBJFORMAT_ELF)
1319 r = ocVerifyImage_ELF ( oc );
1320 # elif defined(OBJFORMAT_PEi386)
1321 r = ocVerifyImage_PEi386 ( oc );
1322 # elif defined(OBJFORMAT_MACHO)
1323 r = ocVerifyImage_MachO ( oc );
1325 barf("loadObj: no verify method");
1327 if (!r) { return r; }
1329 /* build the symbol list for this image */
1330 # if defined(OBJFORMAT_ELF)
1331 r = ocGetNames_ELF ( oc );
1332 # elif defined(OBJFORMAT_PEi386)
1333 r = ocGetNames_PEi386 ( oc );
1334 # elif defined(OBJFORMAT_MACHO)
1335 r = ocGetNames_MachO ( oc );
1337 barf("loadObj: no getNames method");
1339 if (!r) { return r; }
1341 /* loaded, but not resolved yet */
1342 oc->status = OBJECT_LOADED;
1347 /* -----------------------------------------------------------------------------
1348 * resolve all the currently unlinked objects in memory
1350 * Returns: 1 if ok, 0 on error.
1360 for (oc = objects; oc; oc = oc->next) {
1361 if (oc->status != OBJECT_RESOLVED) {
1362 # if defined(OBJFORMAT_ELF)
1363 r = ocResolve_ELF ( oc );
1364 # elif defined(OBJFORMAT_PEi386)
1365 r = ocResolve_PEi386 ( oc );
1366 # elif defined(OBJFORMAT_MACHO)
1367 r = ocResolve_MachO ( oc );
1369 barf("resolveObjs: not implemented on this platform");
1371 if (!r) { return r; }
1372 oc->status = OBJECT_RESOLVED;
1378 /* -----------------------------------------------------------------------------
1379 * delete an object from the pool
1382 unloadObj( char *path )
1384 ObjectCode *oc, *prev;
1386 ASSERT(symhash != NULL);
1387 ASSERT(objects != NULL);
1392 for (oc = objects; oc; prev = oc, oc = oc->next) {
1393 if (!strcmp(oc->fileName,path)) {
1395 /* Remove all the mappings for the symbols within this
1400 for (i = 0; i < oc->n_symbols; i++) {
1401 if (oc->symbols[i] != NULL) {
1402 removeStrHashTable(symhash, oc->symbols[i], NULL);
1410 prev->next = oc->next;
1413 // We're going to leave this in place, in case there are
1414 // any pointers from the heap into it:
1415 // #ifdef mingw32_HOST_OS
1416 // VirtualFree(oc->image);
1418 // stgFree(oc->image);
1420 stgFree(oc->fileName);
1421 stgFree(oc->symbols);
1422 stgFree(oc->sections);
1423 /* The local hash table should have been freed at the end
1424 of the ocResolve_ call on it. */
1425 ASSERT(oc->lochash == NULL);
1431 errorBelch("unloadObj: can't find `%s' to unload", path);
1435 /* -----------------------------------------------------------------------------
1436 * Sanity checking. For each ObjectCode, maintain a list of address ranges
1437 * which may be prodded during relocation, and abort if we try and write
1438 * outside any of these.
1440 static void addProddableBlock ( ObjectCode* oc, void* start, int size )
1443 = stgMallocBytes(sizeof(ProddableBlock), "addProddableBlock");
1444 /* debugBelch("aPB %p %p %d\n", oc, start, size); */
1448 pb->next = oc->proddables;
1449 oc->proddables = pb;
1452 static void checkProddableBlock ( ObjectCode* oc, void* addr )
1455 for (pb = oc->proddables; pb != NULL; pb = pb->next) {
1456 char* s = (char*)(pb->start);
1457 char* e = s + pb->size - 1;
1458 char* a = (char*)addr;
1459 /* Assumes that the biggest fixup involves a 4-byte write. This
1460 probably needs to be changed to 8 (ie, +7) on 64-bit
1462 if (a >= s && (a+3) <= e) return;
1464 barf("checkProddableBlock: invalid fixup in runtime linker");
1467 /* -----------------------------------------------------------------------------
1468 * Section management.
1470 static void addSection ( ObjectCode* oc, SectionKind kind,
1471 void* start, void* end )
1473 Section* s = stgMallocBytes(sizeof(Section), "addSection");
1477 s->next = oc->sections;
1480 debugBelch("addSection: %p-%p (size %d), kind %d\n",
1481 start, ((char*)end)-1, end - start + 1, kind );
1486 /* --------------------------------------------------------------------------
1488 * This is about allocating a small chunk of memory for every symbol in the
1489 * object file. We make sure that the SymboLExtras are always "in range" of
1490 * limited-range PC-relative instructions on various platforms by allocating
1491 * them right next to the object code itself.
1494 #if defined(powerpc_HOST_ARCH) || (defined(x86_64_HOST_ARCH) \
1495 && defined(darwin_TARGET_OS))
1498 ocAllocateSymbolExtras
1500 Allocate additional space at the end of the object file image to make room
1501 for jump islands (powerpc, x86_64) and GOT entries (x86_64).
1503 PowerPC relative branch instructions have a 24 bit displacement field.
1504 As PPC code is always 4-byte-aligned, this yields a +-32MB range.
1505 If a particular imported symbol is outside this range, we have to redirect
1506 the jump to a short piece of new code that just loads the 32bit absolute
1507 address and jumps there.
1508 On x86_64, PC-relative jumps and PC-relative accesses to the GOT are limited
1511 This function just allocates space for one SymbolExtra for every
1512 undefined symbol in the object file. The code for the jump islands is
1513 filled in by makeSymbolExtra below.
1516 static int ocAllocateSymbolExtras( ObjectCode* oc, int count, int first )
1522 int misalignment = 0;
1524 misalignment = oc->misalignment;
1529 // round up to the nearest 4
1530 aligned = (oc->fileSize + 3) & ~3;
1533 #ifndef linux_HOST_OS /* mremap is a linux extension */
1534 #error ocAllocateSymbolExtras doesnt want USE_MMAP to be defined
1537 pagesize = getpagesize();
1538 n = ROUND_UP( oc->fileSize, pagesize );
1539 m = ROUND_UP( aligned + sizeof (SymbolExtra) * count, pagesize );
1541 /* If we have a half-page-size file and map one page of it then
1542 * the part of the page after the size of the file remains accessible.
1543 * If, however, we map in 2 pages, the 2nd page is not accessible
1544 * and will give a "Bus Error" on access. To get around this, we check
1545 * if we need any extra pages for the jump islands and map them in
1546 * anonymously. We must check that we actually require extra pages
1547 * otherwise the attempt to mmap 0 pages of anonymous memory will
1553 /* The effect of this mremap() call is only the ensure that we have
1554 * a sufficient number of virtually contiguous pages. As returned from
1555 * mremap, the pages past the end of the file are not backed. We give
1556 * them a backing by using MAP_FIXED to map in anonymous pages.
1558 oc->image = mremap( oc->image, n, m, MREMAP_MAYMOVE );
1560 if( oc->image == MAP_FAILED )
1562 errorBelch( "Unable to mremap for Jump Islands\n" );
1566 if( mmap( oc->image + n, m - n, PROT_READ | PROT_WRITE | PROT_EXEC,
1567 MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED, 0, 0 ) == MAP_FAILED )
1569 errorBelch( "Unable to mmap( MAP_FIXED ) for Jump Islands\n" );
1575 oc->image -= misalignment;
1576 oc->image = stgReallocBytes( oc->image,
1578 aligned + sizeof (SymbolExtra) * count,
1579 "ocAllocateSymbolExtras" );
1580 oc->image += misalignment;
1581 #endif /* USE_MMAP */
1583 oc->symbol_extras = (SymbolExtra *) (oc->image + aligned);
1584 memset( oc->symbol_extras, 0, sizeof (SymbolExtra) * count );
1587 oc->symbol_extras = NULL;
1589 oc->first_symbol_extra = first;
1590 oc->n_symbol_extras = count;
1595 static SymbolExtra* makeSymbolExtra( ObjectCode* oc,
1596 unsigned long symbolNumber,
1597 unsigned long target )
1601 ASSERT( symbolNumber >= oc->first_symbol_extra
1602 && symbolNumber - oc->first_symbol_extra < oc->n_symbol_extras);
1604 extra = &oc->symbol_extras[symbolNumber - oc->first_symbol_extra];
1606 #ifdef powerpc_HOST_ARCH
1607 // lis r12, hi16(target)
1608 extra->jumpIsland.lis_r12 = 0x3d80;
1609 extra->jumpIsland.hi_addr = target >> 16;
1611 // ori r12, r12, lo16(target)
1612 extra->jumpIsland.ori_r12_r12 = 0x618c;
1613 extra->jumpIsland.lo_addr = target & 0xffff;
1616 extra->jumpIsland.mtctr_r12 = 0x7d8903a6;
1619 extra->jumpIsland.bctr = 0x4e800420;
1621 #ifdef x86_64_HOST_ARCH
1623 static uint8_t jmp[] = { 0xFF, 0x25, 0xF2, 0xFF, 0xFF, 0xFF };
1624 extra->addr = target;
1625 memcpy(extra->jumpIsland, jmp, 6);
1633 /* --------------------------------------------------------------------------
1634 * PowerPC specifics (instruction cache flushing)
1635 * ------------------------------------------------------------------------*/
1637 #ifdef powerpc_TARGET_ARCH
1639 ocFlushInstructionCache
1641 Flush the data & instruction caches.
1642 Because the PPC has split data/instruction caches, we have to
1643 do that whenever we modify code at runtime.
1646 static void ocFlushInstructionCache( ObjectCode *oc )
1648 int n = (oc->fileSize + sizeof( SymbolExtra ) * oc->n_symbol_extras + 3) / 4;
1649 unsigned long *p = (unsigned long *) oc->image;
1653 __asm__ volatile ( "dcbf 0,%0\n\t"
1661 __asm__ volatile ( "sync\n\t"
1667 /* --------------------------------------------------------------------------
1668 * PEi386 specifics (Win32 targets)
1669 * ------------------------------------------------------------------------*/
1671 /* The information for this linker comes from
1672 Microsoft Portable Executable
1673 and Common Object File Format Specification
1674 revision 5.1 January 1998
1675 which SimonM says comes from the MS Developer Network CDs.
1677 It can be found there (on older CDs), but can also be found
1680 http://www.microsoft.com/hwdev/hardware/PECOFF.asp
1682 (this is Rev 6.0 from February 1999).
1684 Things move, so if that fails, try searching for it via
1686 http://www.google.com/search?q=PE+COFF+specification
1688 The ultimate reference for the PE format is the Winnt.h
1689 header file that comes with the Platform SDKs; as always,
1690 implementations will drift wrt their documentation.
1692 A good background article on the PE format is Matt Pietrek's
1693 March 1994 article in Microsoft System Journal (MSJ)
1694 (Vol.9, No. 3): "Peering Inside the PE: A Tour of the
1695 Win32 Portable Executable File Format." The info in there
1696 has recently been updated in a two part article in
1697 MSDN magazine, issues Feb and March 2002,
1698 "Inside Windows: An In-Depth Look into the Win32 Portable
1699 Executable File Format"
1701 John Levine's book "Linkers and Loaders" contains useful
1706 #if defined(OBJFORMAT_PEi386)
1710 typedef unsigned char UChar;
1711 typedef unsigned short UInt16;
1712 typedef unsigned int UInt32;
1719 UInt16 NumberOfSections;
1720 UInt32 TimeDateStamp;
1721 UInt32 PointerToSymbolTable;
1722 UInt32 NumberOfSymbols;
1723 UInt16 SizeOfOptionalHeader;
1724 UInt16 Characteristics;
1728 #define sizeof_COFF_header 20
1735 UInt32 VirtualAddress;
1736 UInt32 SizeOfRawData;
1737 UInt32 PointerToRawData;
1738 UInt32 PointerToRelocations;
1739 UInt32 PointerToLinenumbers;
1740 UInt16 NumberOfRelocations;
1741 UInt16 NumberOfLineNumbers;
1742 UInt32 Characteristics;
1746 #define sizeof_COFF_section 40
1753 UInt16 SectionNumber;
1756 UChar NumberOfAuxSymbols;
1760 #define sizeof_COFF_symbol 18
1765 UInt32 VirtualAddress;
1766 UInt32 SymbolTableIndex;
1771 #define sizeof_COFF_reloc 10
1774 /* From PE spec doc, section 3.3.2 */
1775 /* Note use of MYIMAGE_* since IMAGE_* are already defined in
1776 windows.h -- for the same purpose, but I want to know what I'm
1778 #define MYIMAGE_FILE_RELOCS_STRIPPED 0x0001
1779 #define MYIMAGE_FILE_EXECUTABLE_IMAGE 0x0002
1780 #define MYIMAGE_FILE_DLL 0x2000
1781 #define MYIMAGE_FILE_SYSTEM 0x1000
1782 #define MYIMAGE_FILE_BYTES_REVERSED_HI 0x8000
1783 #define MYIMAGE_FILE_BYTES_REVERSED_LO 0x0080
1784 #define MYIMAGE_FILE_32BIT_MACHINE 0x0100
1786 /* From PE spec doc, section 5.4.2 and 5.4.4 */
1787 #define MYIMAGE_SYM_CLASS_EXTERNAL 2
1788 #define MYIMAGE_SYM_CLASS_STATIC 3
1789 #define MYIMAGE_SYM_UNDEFINED 0
1791 /* From PE spec doc, section 4.1 */
1792 #define MYIMAGE_SCN_CNT_CODE 0x00000020
1793 #define MYIMAGE_SCN_CNT_INITIALIZED_DATA 0x00000040
1794 #define MYIMAGE_SCN_LNK_NRELOC_OVFL 0x01000000
1796 /* From PE spec doc, section 5.2.1 */
1797 #define MYIMAGE_REL_I386_DIR32 0x0006
1798 #define MYIMAGE_REL_I386_REL32 0x0014
1801 /* We use myindex to calculate array addresses, rather than
1802 simply doing the normal subscript thing. That's because
1803 some of the above structs have sizes which are not
1804 a whole number of words. GCC rounds their sizes up to a
1805 whole number of words, which means that the address calcs
1806 arising from using normal C indexing or pointer arithmetic
1807 are just plain wrong. Sigh.
1810 myindex ( int scale, void* base, int index )
1813 ((UChar*)base) + scale * index;
1818 printName ( UChar* name, UChar* strtab )
1820 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
1821 UInt32 strtab_offset = * (UInt32*)(name+4);
1822 debugBelch("%s", strtab + strtab_offset );
1825 for (i = 0; i < 8; i++) {
1826 if (name[i] == 0) break;
1827 debugBelch("%c", name[i] );
1834 copyName ( UChar* name, UChar* strtab, UChar* dst, int dstSize )
1836 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
1837 UInt32 strtab_offset = * (UInt32*)(name+4);
1838 strncpy ( dst, strtab+strtab_offset, dstSize );
1844 if (name[i] == 0) break;
1854 cstring_from_COFF_symbol_name ( UChar* name, UChar* strtab )
1857 /* If the string is longer than 8 bytes, look in the
1858 string table for it -- this will be correctly zero terminated.
1860 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
1861 UInt32 strtab_offset = * (UInt32*)(name+4);
1862 return ((UChar*)strtab) + strtab_offset;
1864 /* Otherwise, if shorter than 8 bytes, return the original,
1865 which by defn is correctly terminated.
1867 if (name[7]==0) return name;
1868 /* The annoying case: 8 bytes. Copy into a temporary
1869 (which is never freed ...)
1871 newstr = stgMallocBytes(9, "cstring_from_COFF_symbol_name");
1873 strncpy(newstr,name,8);
1879 /* Just compares the short names (first 8 chars) */
1880 static COFF_section *
1881 findPEi386SectionCalled ( ObjectCode* oc, char* name )
1885 = (COFF_header*)(oc->image);
1886 COFF_section* sectab
1888 ((UChar*)(oc->image))
1889 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
1891 for (i = 0; i < hdr->NumberOfSections; i++) {
1894 COFF_section* section_i
1896 myindex ( sizeof_COFF_section, sectab, i );
1897 n1 = (UChar*) &(section_i->Name);
1899 if (n1[0]==n2[0] && n1[1]==n2[1] && n1[2]==n2[2] &&
1900 n1[3]==n2[3] && n1[4]==n2[4] && n1[5]==n2[5] &&
1901 n1[6]==n2[6] && n1[7]==n2[7])
1910 zapTrailingAtSign ( UChar* sym )
1912 # define my_isdigit(c) ((c) >= '0' && (c) <= '9')
1914 if (sym[0] == 0) return;
1916 while (sym[i] != 0) i++;
1919 while (j > 0 && my_isdigit(sym[j])) j--;
1920 if (j > 0 && sym[j] == '@' && j != i) sym[j] = 0;
1926 ocVerifyImage_PEi386 ( ObjectCode* oc )
1931 COFF_section* sectab;
1932 COFF_symbol* symtab;
1934 /* debugBelch("\nLOADING %s\n", oc->fileName); */
1935 hdr = (COFF_header*)(oc->image);
1936 sectab = (COFF_section*) (
1937 ((UChar*)(oc->image))
1938 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
1940 symtab = (COFF_symbol*) (
1941 ((UChar*)(oc->image))
1942 + hdr->PointerToSymbolTable
1944 strtab = ((UChar*)symtab)
1945 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
1947 if (hdr->Machine != 0x14c) {
1948 errorBelch("%s: Not x86 PEi386", oc->fileName);
1951 if (hdr->SizeOfOptionalHeader != 0) {
1952 errorBelch("%s: PEi386 with nonempty optional header", oc->fileName);
1955 if ( /* (hdr->Characteristics & MYIMAGE_FILE_RELOCS_STRIPPED) || */
1956 (hdr->Characteristics & MYIMAGE_FILE_EXECUTABLE_IMAGE) ||
1957 (hdr->Characteristics & MYIMAGE_FILE_DLL) ||
1958 (hdr->Characteristics & MYIMAGE_FILE_SYSTEM) ) {
1959 errorBelch("%s: Not a PEi386 object file", oc->fileName);
1962 if ( (hdr->Characteristics & MYIMAGE_FILE_BYTES_REVERSED_HI)
1963 /* || !(hdr->Characteristics & MYIMAGE_FILE_32BIT_MACHINE) */ ) {
1964 errorBelch("%s: Invalid PEi386 word size or endiannness: %d",
1966 (int)(hdr->Characteristics));
1969 /* If the string table size is way crazy, this might indicate that
1970 there are more than 64k relocations, despite claims to the
1971 contrary. Hence this test. */
1972 /* debugBelch("strtab size %d\n", * (UInt32*)strtab); */
1974 if ( (*(UInt32*)strtab) > 600000 ) {
1975 /* Note that 600k has no special significance other than being
1976 big enough to handle the almost-2MB-sized lumps that
1977 constitute HSwin32*.o. */
1978 debugBelch("PEi386 object has suspiciously large string table; > 64k relocs?");
1983 /* No further verification after this point; only debug printing. */
1985 IF_DEBUG(linker, i=1);
1986 if (i == 0) return 1;
1988 debugBelch( "sectab offset = %d\n", ((UChar*)sectab) - ((UChar*)hdr) );
1989 debugBelch( "symtab offset = %d\n", ((UChar*)symtab) - ((UChar*)hdr) );
1990 debugBelch( "strtab offset = %d\n", ((UChar*)strtab) - ((UChar*)hdr) );
1993 debugBelch( "Machine: 0x%x\n", (UInt32)(hdr->Machine) );
1994 debugBelch( "# sections: %d\n", (UInt32)(hdr->NumberOfSections) );
1995 debugBelch( "time/date: 0x%x\n", (UInt32)(hdr->TimeDateStamp) );
1996 debugBelch( "symtab offset: %d\n", (UInt32)(hdr->PointerToSymbolTable) );
1997 debugBelch( "# symbols: %d\n", (UInt32)(hdr->NumberOfSymbols) );
1998 debugBelch( "sz of opt hdr: %d\n", (UInt32)(hdr->SizeOfOptionalHeader) );
1999 debugBelch( "characteristics: 0x%x\n", (UInt32)(hdr->Characteristics) );
2001 /* Print the section table. */
2003 for (i = 0; i < hdr->NumberOfSections; i++) {
2005 COFF_section* sectab_i
2007 myindex ( sizeof_COFF_section, sectab, i );
2014 printName ( sectab_i->Name, strtab );
2024 sectab_i->VirtualSize,
2025 sectab_i->VirtualAddress,
2026 sectab_i->SizeOfRawData,
2027 sectab_i->PointerToRawData,
2028 sectab_i->NumberOfRelocations,
2029 sectab_i->PointerToRelocations,
2030 sectab_i->PointerToRawData
2032 reltab = (COFF_reloc*) (
2033 ((UChar*)(oc->image)) + sectab_i->PointerToRelocations
2036 if ( sectab_i->Characteristics & MYIMAGE_SCN_LNK_NRELOC_OVFL ) {
2037 /* If the relocation field (a short) has overflowed, the
2038 * real count can be found in the first reloc entry.
2040 * See Section 4.1 (last para) of the PE spec (rev6.0).
2042 COFF_reloc* rel = (COFF_reloc*)
2043 myindex ( sizeof_COFF_reloc, reltab, 0 );
2044 noRelocs = rel->VirtualAddress;
2047 noRelocs = sectab_i->NumberOfRelocations;
2051 for (; j < noRelocs; j++) {
2053 COFF_reloc* rel = (COFF_reloc*)
2054 myindex ( sizeof_COFF_reloc, reltab, j );
2056 " type 0x%-4x vaddr 0x%-8x name `",
2058 rel->VirtualAddress );
2059 sym = (COFF_symbol*)
2060 myindex ( sizeof_COFF_symbol, symtab, rel->SymbolTableIndex );
2061 /* Hmm..mysterious looking offset - what's it for? SOF */
2062 printName ( sym->Name, strtab -10 );
2069 debugBelch("string table has size 0x%x\n", * (UInt32*)strtab );
2070 debugBelch("---START of string table---\n");
2071 for (i = 4; i < *(Int32*)strtab; i++) {
2073 debugBelch("\n"); else
2074 debugBelch("%c", strtab[i] );
2076 debugBelch("--- END of string table---\n");
2081 COFF_symbol* symtab_i;
2082 if (i >= (Int32)(hdr->NumberOfSymbols)) break;
2083 symtab_i = (COFF_symbol*)
2084 myindex ( sizeof_COFF_symbol, symtab, i );
2090 printName ( symtab_i->Name, strtab );
2099 (Int32)(symtab_i->SectionNumber),
2100 (UInt32)symtab_i->Type,
2101 (UInt32)symtab_i->StorageClass,
2102 (UInt32)symtab_i->NumberOfAuxSymbols
2104 i += symtab_i->NumberOfAuxSymbols;
2114 ocGetNames_PEi386 ( ObjectCode* oc )
2117 COFF_section* sectab;
2118 COFF_symbol* symtab;
2125 hdr = (COFF_header*)(oc->image);
2126 sectab = (COFF_section*) (
2127 ((UChar*)(oc->image))
2128 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2130 symtab = (COFF_symbol*) (
2131 ((UChar*)(oc->image))
2132 + hdr->PointerToSymbolTable
2134 strtab = ((UChar*)(oc->image))
2135 + hdr->PointerToSymbolTable
2136 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
2138 /* Allocate space for any (local, anonymous) .bss sections. */
2140 for (i = 0; i < hdr->NumberOfSections; i++) {
2143 COFF_section* sectab_i
2145 myindex ( sizeof_COFF_section, sectab, i );
2146 if (0 != strcmp(sectab_i->Name, ".bss")) continue;
2147 /* sof 10/05: the PE spec text isn't too clear regarding what
2148 * the SizeOfRawData field is supposed to hold for object
2149 * file sections containing just uninitialized data -- for executables,
2150 * it is supposed to be zero; unclear what it's supposed to be
2151 * for object files. However, VirtualSize is guaranteed to be
2152 * zero for object files, which definitely suggests that SizeOfRawData
2153 * will be non-zero (where else would the size of this .bss section be
2154 * stored?) Looking at the COFF_section info for incoming object files,
2155 * this certainly appears to be the case.
2157 * => I suspect we've been incorrectly handling .bss sections in (relocatable)
2158 * object files up until now. This turned out to bite us with ghc-6.4.1's use
2159 * of gcc-3.4.x, which has started to emit initially-zeroed-out local 'static'
2160 * variable decls into to the .bss section. (The specific function in Q which
2161 * triggered this is libraries/base/cbits/dirUtils.c:__hscore_getFolderPath())
2163 if (sectab_i->VirtualSize == 0 && sectab_i->SizeOfRawData == 0) continue;
2164 /* This is a non-empty .bss section. Allocate zeroed space for
2165 it, and set its PointerToRawData field such that oc->image +
2166 PointerToRawData == addr_of_zeroed_space. */
2167 bss_sz = sectab_i->VirtualSize;
2168 if ( bss_sz < sectab_i->SizeOfRawData) { bss_sz = sectab_i->SizeOfRawData; }
2169 zspace = stgCallocBytes(1, bss_sz, "ocGetNames_PEi386(anonymous bss)");
2170 sectab_i->PointerToRawData = ((UChar*)zspace) - ((UChar*)(oc->image));
2171 addProddableBlock(oc, zspace, bss_sz);
2172 /* debugBelch("BSS anon section at 0x%x\n", zspace); */
2175 /* Copy section information into the ObjectCode. */
2177 for (i = 0; i < hdr->NumberOfSections; i++) {
2183 = SECTIONKIND_OTHER;
2184 COFF_section* sectab_i
2186 myindex ( sizeof_COFF_section, sectab, i );
2187 IF_DEBUG(linker, debugBelch("section name = %s\n", sectab_i->Name ));
2190 /* I'm sure this is the Right Way to do it. However, the
2191 alternative of testing the sectab_i->Name field seems to
2192 work ok with Cygwin.
2194 if (sectab_i->Characteristics & MYIMAGE_SCN_CNT_CODE ||
2195 sectab_i->Characteristics & MYIMAGE_SCN_CNT_INITIALIZED_DATA)
2196 kind = SECTIONKIND_CODE_OR_RODATA;
2199 if (0==strcmp(".text",sectab_i->Name) ||
2200 0==strcmp(".rdata",sectab_i->Name)||
2201 0==strcmp(".rodata",sectab_i->Name))
2202 kind = SECTIONKIND_CODE_OR_RODATA;
2203 if (0==strcmp(".data",sectab_i->Name) ||
2204 0==strcmp(".bss",sectab_i->Name))
2205 kind = SECTIONKIND_RWDATA;
2207 ASSERT(sectab_i->SizeOfRawData == 0 || sectab_i->VirtualSize == 0);
2208 sz = sectab_i->SizeOfRawData;
2209 if (sz < sectab_i->VirtualSize) sz = sectab_i->VirtualSize;
2211 start = ((UChar*)(oc->image)) + sectab_i->PointerToRawData;
2212 end = start + sz - 1;
2214 if (kind == SECTIONKIND_OTHER
2215 /* Ignore sections called which contain stabs debugging
2217 && 0 != strcmp(".stab", sectab_i->Name)
2218 && 0 != strcmp(".stabstr", sectab_i->Name)
2219 /* ignore constructor section for now */
2220 && 0 != strcmp(".ctors", sectab_i->Name)
2221 /* ignore section generated from .ident */
2222 && 0!= strcmp("/4", sectab_i->Name)
2224 errorBelch("Unknown PEi386 section name `%s' (while processing: %s)", sectab_i->Name, oc->fileName);
2228 if (kind != SECTIONKIND_OTHER && end >= start) {
2229 addSection(oc, kind, start, end);
2230 addProddableBlock(oc, start, end - start + 1);
2234 /* Copy exported symbols into the ObjectCode. */
2236 oc->n_symbols = hdr->NumberOfSymbols;
2237 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
2238 "ocGetNames_PEi386(oc->symbols)");
2239 /* Call me paranoid; I don't care. */
2240 for (i = 0; i < oc->n_symbols; i++)
2241 oc->symbols[i] = NULL;
2245 COFF_symbol* symtab_i;
2246 if (i >= (Int32)(hdr->NumberOfSymbols)) break;
2247 symtab_i = (COFF_symbol*)
2248 myindex ( sizeof_COFF_symbol, symtab, i );
2252 if (symtab_i->StorageClass == MYIMAGE_SYM_CLASS_EXTERNAL
2253 && symtab_i->SectionNumber != MYIMAGE_SYM_UNDEFINED) {
2254 /* This symbol is global and defined, viz, exported */
2255 /* for MYIMAGE_SYMCLASS_EXTERNAL
2256 && !MYIMAGE_SYM_UNDEFINED,
2257 the address of the symbol is:
2258 address of relevant section + offset in section
2260 COFF_section* sectabent
2261 = (COFF_section*) myindex ( sizeof_COFF_section,
2263 symtab_i->SectionNumber-1 );
2264 addr = ((UChar*)(oc->image))
2265 + (sectabent->PointerToRawData
2269 if (symtab_i->SectionNumber == MYIMAGE_SYM_UNDEFINED
2270 && symtab_i->Value > 0) {
2271 /* This symbol isn't in any section at all, ie, global bss.
2272 Allocate zeroed space for it. */
2273 addr = stgCallocBytes(1, symtab_i->Value,
2274 "ocGetNames_PEi386(non-anonymous bss)");
2275 addSection(oc, SECTIONKIND_RWDATA, addr,
2276 ((UChar*)addr) + symtab_i->Value - 1);
2277 addProddableBlock(oc, addr, symtab_i->Value);
2278 /* debugBelch("BSS section at 0x%x\n", addr); */
2281 if (addr != NULL ) {
2282 sname = cstring_from_COFF_symbol_name ( symtab_i->Name, strtab );
2283 /* debugBelch("addSymbol %p `%s \n", addr,sname); */
2284 IF_DEBUG(linker, debugBelch("addSymbol %p `%s'\n", addr,sname);)
2285 ASSERT(i >= 0 && i < oc->n_symbols);
2286 /* cstring_from_COFF_symbol_name always succeeds. */
2287 oc->symbols[i] = sname;
2288 ghciInsertStrHashTable(oc->fileName, symhash, sname, addr);
2292 "IGNORING symbol %d\n"
2296 printName ( symtab_i->Name, strtab );
2305 (Int32)(symtab_i->SectionNumber),
2306 (UInt32)symtab_i->Type,
2307 (UInt32)symtab_i->StorageClass,
2308 (UInt32)symtab_i->NumberOfAuxSymbols
2313 i += symtab_i->NumberOfAuxSymbols;
2322 ocResolve_PEi386 ( ObjectCode* oc )
2325 COFF_section* sectab;
2326 COFF_symbol* symtab;
2336 /* ToDo: should be variable-sized? But is at least safe in the
2337 sense of buffer-overrun-proof. */
2339 /* debugBelch("resolving for %s\n", oc->fileName); */
2341 hdr = (COFF_header*)(oc->image);
2342 sectab = (COFF_section*) (
2343 ((UChar*)(oc->image))
2344 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2346 symtab = (COFF_symbol*) (
2347 ((UChar*)(oc->image))
2348 + hdr->PointerToSymbolTable
2350 strtab = ((UChar*)(oc->image))
2351 + hdr->PointerToSymbolTable
2352 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
2354 for (i = 0; i < hdr->NumberOfSections; i++) {
2355 COFF_section* sectab_i
2357 myindex ( sizeof_COFF_section, sectab, i );
2360 ((UChar*)(oc->image)) + sectab_i->PointerToRelocations
2363 /* Ignore sections called which contain stabs debugging
2365 if (0 == strcmp(".stab", sectab_i->Name)
2366 || 0 == strcmp(".stabstr", sectab_i->Name)
2367 || 0 == strcmp(".ctors", sectab_i->Name))
2370 if ( sectab_i->Characteristics & MYIMAGE_SCN_LNK_NRELOC_OVFL ) {
2371 /* If the relocation field (a short) has overflowed, the
2372 * real count can be found in the first reloc entry.
2374 * See Section 4.1 (last para) of the PE spec (rev6.0).
2376 * Nov2003 update: the GNU linker still doesn't correctly
2377 * handle the generation of relocatable object files with
2378 * overflown relocations. Hence the output to warn of potential
2381 COFF_reloc* rel = (COFF_reloc*)
2382 myindex ( sizeof_COFF_reloc, reltab, 0 );
2383 noRelocs = rel->VirtualAddress;
2385 /* 10/05: we now assume (and check for) a GNU ld that is capable
2386 * of handling object files with (>2^16) of relocs.
2389 debugBelch("WARNING: Overflown relocation field (# relocs found: %u)\n",
2394 noRelocs = sectab_i->NumberOfRelocations;
2399 for (; j < noRelocs; j++) {
2401 COFF_reloc* reltab_j
2403 myindex ( sizeof_COFF_reloc, reltab, j );
2405 /* the location to patch */
2407 ((UChar*)(oc->image))
2408 + (sectab_i->PointerToRawData
2409 + reltab_j->VirtualAddress
2410 - sectab_i->VirtualAddress )
2412 /* the existing contents of pP */
2414 /* the symbol to connect to */
2415 sym = (COFF_symbol*)
2416 myindex ( sizeof_COFF_symbol,
2417 symtab, reltab_j->SymbolTableIndex );
2420 "reloc sec %2d num %3d: type 0x%-4x "
2421 "vaddr 0x%-8x name `",
2423 (UInt32)reltab_j->Type,
2424 reltab_j->VirtualAddress );
2425 printName ( sym->Name, strtab );
2426 debugBelch("'\n" ));
2428 if (sym->StorageClass == MYIMAGE_SYM_CLASS_STATIC) {
2429 COFF_section* section_sym
2430 = findPEi386SectionCalled ( oc, sym->Name );
2432 errorBelch("%s: can't find section `%s'", oc->fileName, sym->Name);
2435 S = ((UInt32)(oc->image))
2436 + (section_sym->PointerToRawData
2439 copyName ( sym->Name, strtab, symbol, 1000-1 );
2440 S = (UInt32) lookupLocalSymbol( oc, symbol );
2441 if ((void*)S != NULL) goto foundit;
2442 S = (UInt32) lookupSymbol( symbol );
2443 if ((void*)S != NULL) goto foundit;
2444 zapTrailingAtSign ( symbol );
2445 S = (UInt32) lookupLocalSymbol( oc, symbol );
2446 if ((void*)S != NULL) goto foundit;
2447 S = (UInt32) lookupSymbol( symbol );
2448 if ((void*)S != NULL) goto foundit;
2449 /* Newline first because the interactive linker has printed "linking..." */
2450 errorBelch("\n%s: unknown symbol `%s'", oc->fileName, symbol);
2454 checkProddableBlock(oc, pP);
2455 switch (reltab_j->Type) {
2456 case MYIMAGE_REL_I386_DIR32:
2459 case MYIMAGE_REL_I386_REL32:
2460 /* Tricky. We have to insert a displacement at
2461 pP which, when added to the PC for the _next_
2462 insn, gives the address of the target (S).
2463 Problem is to know the address of the next insn
2464 when we only know pP. We assume that this
2465 literal field is always the last in the insn,
2466 so that the address of the next insn is pP+4
2467 -- hence the constant 4.
2468 Also I don't know if A should be added, but so
2469 far it has always been zero.
2471 SOF 05/2005: 'A' (old contents of *pP) have been observed
2472 to contain values other than zero (the 'wx' object file
2473 that came with wxhaskell-0.9.4; dunno how it was compiled..).
2474 So, add displacement to old value instead of asserting
2475 A to be zero. Fixes wxhaskell-related crashes, and no other
2476 ill effects have been observed.
2478 Update: the reason why we're seeing these more elaborate
2479 relocations is due to a switch in how the NCG compiles SRTs
2480 and offsets to them from info tables. SRTs live in .(ro)data,
2481 while info tables live in .text, causing GAS to emit REL32/DISP32
2482 relocations with non-zero values. Adding the displacement is
2483 the right thing to do.
2485 *pP = S - ((UInt32)pP) - 4 + A;
2488 debugBelch("%s: unhandled PEi386 relocation type %d",
2489 oc->fileName, reltab_j->Type);
2496 IF_DEBUG(linker, debugBelch("completed %s", oc->fileName));
2500 #endif /* defined(OBJFORMAT_PEi386) */
2503 /* --------------------------------------------------------------------------
2505 * ------------------------------------------------------------------------*/
2507 #if defined(OBJFORMAT_ELF)
2512 #if defined(sparc_HOST_ARCH)
2513 # define ELF_TARGET_SPARC /* Used inside <elf.h> */
2514 #elif defined(i386_HOST_ARCH)
2515 # define ELF_TARGET_386 /* Used inside <elf.h> */
2516 #elif defined(x86_64_HOST_ARCH)
2517 # define ELF_TARGET_X64_64
2519 #elif defined (ia64_HOST_ARCH)
2520 # define ELF_TARGET_IA64 /* Used inside <elf.h> */
2522 # define ELF_FUNCTION_DESC /* calling convention uses function descriptors */
2523 # define ELF_NEED_GOT /* needs Global Offset Table */
2524 # define ELF_NEED_PLT /* needs Procedure Linkage Tables */
2527 #if !defined(openbsd_HOST_OS)
2530 /* openbsd elf has things in different places, with diff names */
2531 #include <elf_abi.h>
2532 #include <machine/reloc.h>
2533 #define R_386_32 RELOC_32
2534 #define R_386_PC32 RELOC_PC32
2538 * Define a set of types which can be used for both ELF32 and ELF64
2542 #define ELFCLASS ELFCLASS64
2543 #define Elf_Addr Elf64_Addr
2544 #define Elf_Word Elf64_Word
2545 #define Elf_Sword Elf64_Sword
2546 #define Elf_Ehdr Elf64_Ehdr
2547 #define Elf_Phdr Elf64_Phdr
2548 #define Elf_Shdr Elf64_Shdr
2549 #define Elf_Sym Elf64_Sym
2550 #define Elf_Rel Elf64_Rel
2551 #define Elf_Rela Elf64_Rela
2552 #define ELF_ST_TYPE ELF64_ST_TYPE
2553 #define ELF_ST_BIND ELF64_ST_BIND
2554 #define ELF_R_TYPE ELF64_R_TYPE
2555 #define ELF_R_SYM ELF64_R_SYM
2557 #define ELFCLASS ELFCLASS32
2558 #define Elf_Addr Elf32_Addr
2559 #define Elf_Word Elf32_Word
2560 #define Elf_Sword Elf32_Sword
2561 #define Elf_Ehdr Elf32_Ehdr
2562 #define Elf_Phdr Elf32_Phdr
2563 #define Elf_Shdr Elf32_Shdr
2564 #define Elf_Sym Elf32_Sym
2565 #define Elf_Rel Elf32_Rel
2566 #define Elf_Rela Elf32_Rela
2568 #define ELF_ST_TYPE ELF32_ST_TYPE
2571 #define ELF_ST_BIND ELF32_ST_BIND
2574 #define ELF_R_TYPE ELF32_R_TYPE
2577 #define ELF_R_SYM ELF32_R_SYM
2583 * Functions to allocate entries in dynamic sections. Currently we simply
2584 * preallocate a large number, and we don't check if a entry for the given
2585 * target already exists (a linear search is too slow). Ideally these
2586 * entries would be associated with symbols.
2589 /* These sizes sufficient to load HSbase + HShaskell98 + a few modules */
2590 #define GOT_SIZE 0x20000
2591 #define FUNCTION_TABLE_SIZE 0x10000
2592 #define PLT_SIZE 0x08000
2595 static Elf_Addr got[GOT_SIZE];
2596 static unsigned int gotIndex;
2597 static Elf_Addr gp_val = (Elf_Addr)got;
2600 allocateGOTEntry(Elf_Addr target)
2604 if (gotIndex >= GOT_SIZE)
2605 barf("Global offset table overflow");
2607 entry = &got[gotIndex++];
2609 return (Elf_Addr)entry;
2613 #ifdef ELF_FUNCTION_DESC
2619 static FunctionDesc functionTable[FUNCTION_TABLE_SIZE];
2620 static unsigned int functionTableIndex;
2623 allocateFunctionDesc(Elf_Addr target)
2625 FunctionDesc *entry;
2627 if (functionTableIndex >= FUNCTION_TABLE_SIZE)
2628 barf("Function table overflow");
2630 entry = &functionTable[functionTableIndex++];
2632 entry->gp = (Elf_Addr)gp_val;
2633 return (Elf_Addr)entry;
2637 copyFunctionDesc(Elf_Addr target)
2639 FunctionDesc *olddesc = (FunctionDesc *)target;
2640 FunctionDesc *newdesc;
2642 newdesc = (FunctionDesc *)allocateFunctionDesc(olddesc->ip);
2643 newdesc->gp = olddesc->gp;
2644 return (Elf_Addr)newdesc;
2649 #ifdef ia64_HOST_ARCH
2650 static void ia64_reloc_gprel22(Elf_Addr target, Elf_Addr value);
2651 static void ia64_reloc_pcrel21(Elf_Addr target, Elf_Addr value, ObjectCode *oc);
2653 static unsigned char plt_code[] =
2655 /* taken from binutils bfd/elfxx-ia64.c */
2656 0x0b, 0x78, 0x00, 0x02, 0x00, 0x24, /* [MMI] addl r15=0,r1;; */
2657 0x00, 0x41, 0x3c, 0x30, 0x28, 0xc0, /* ld8 r16=[r15],8 */
2658 0x01, 0x08, 0x00, 0x84, /* mov r14=r1;; */
2659 0x11, 0x08, 0x00, 0x1e, 0x18, 0x10, /* [MIB] ld8 r1=[r15] */
2660 0x60, 0x80, 0x04, 0x80, 0x03, 0x00, /* mov b6=r16 */
2661 0x60, 0x00, 0x80, 0x00 /* br.few b6;; */
2664 /* If we can't get to the function descriptor via gp, take a local copy of it */
2665 #define PLT_RELOC(code, target) { \
2666 Elf64_Sxword rel_value = target - gp_val; \
2667 if ((rel_value > 0x1fffff) || (rel_value < -0x1fffff)) \
2668 ia64_reloc_gprel22((Elf_Addr)code, copyFunctionDesc(target)); \
2670 ia64_reloc_gprel22((Elf_Addr)code, target); \
2675 unsigned char code[sizeof(plt_code)];
2679 allocatePLTEntry(Elf_Addr target, ObjectCode *oc)
2681 PLTEntry *plt = (PLTEntry *)oc->plt;
2684 if (oc->pltIndex >= PLT_SIZE)
2685 barf("Procedure table overflow");
2687 entry = &plt[oc->pltIndex++];
2688 memcpy(entry->code, plt_code, sizeof(entry->code));
2689 PLT_RELOC(entry->code, target);
2690 return (Elf_Addr)entry;
2696 return (PLT_SIZE * sizeof(PLTEntry));
2701 #if x86_64_HOST_ARCH
2702 // On x86_64, 32-bit relocations are often used, which requires that
2703 // we can resolve a symbol to a 32-bit offset. However, shared
2704 // libraries are placed outside the 2Gb area, which leaves us with a
2705 // problem when we need to give a 32-bit offset to a symbol in a
2708 // For a function symbol, we can allocate a bounce sequence inside the
2709 // 2Gb area and resolve the symbol to this. The bounce sequence is
2710 // simply a long jump instruction to the real location of the symbol.
2712 // For data references, we're screwed.
2715 unsigned char jmp[8]; /* 6 byte instruction: jmpq *0x00000002(%rip) */
2719 #define X86_64_BB_SIZE 1024
2721 static x86_64_bounce *x86_64_bounce_buffer = NULL;
2722 static nat x86_64_bb_next_off;
2725 x86_64_high_symbol( char *lbl, void *addr )
2727 x86_64_bounce *bounce;
2729 if ( x86_64_bounce_buffer == NULL ||
2730 x86_64_bb_next_off >= X86_64_BB_SIZE ) {
2731 x86_64_bounce_buffer =
2732 mmap(NULL, X86_64_BB_SIZE * sizeof(x86_64_bounce),
2733 PROT_EXEC|PROT_READ|PROT_WRITE,
2734 MAP_PRIVATE|MAP_32BIT|MAP_ANONYMOUS, -1, 0);
2735 if (x86_64_bounce_buffer == MAP_FAILED) {
2736 barf("x86_64_high_symbol: mmap failed");
2738 x86_64_bb_next_off = 0;
2740 bounce = &x86_64_bounce_buffer[x86_64_bb_next_off];
2741 bounce->jmp[0] = 0xff;
2742 bounce->jmp[1] = 0x25;
2743 bounce->jmp[2] = 0x02;
2744 bounce->jmp[3] = 0x00;
2745 bounce->jmp[4] = 0x00;
2746 bounce->jmp[5] = 0x00;
2747 bounce->addr = addr;
2748 x86_64_bb_next_off++;
2750 IF_DEBUG(linker, debugBelch("x86_64: allocated bounce entry for %s->%p at %p\n",
2751 lbl, addr, bounce));
2753 insertStrHashTable(symhash, lbl, bounce);
2760 * Generic ELF functions
2764 findElfSection ( void* objImage, Elf_Word sh_type )
2766 char* ehdrC = (char*)objImage;
2767 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2768 Elf_Shdr* shdr = (Elf_Shdr*)(ehdrC + ehdr->e_shoff);
2769 char* sh_strtab = ehdrC + shdr[ehdr->e_shstrndx].sh_offset;
2773 for (i = 0; i < ehdr->e_shnum; i++) {
2774 if (shdr[i].sh_type == sh_type
2775 /* Ignore the section header's string table. */
2776 && i != ehdr->e_shstrndx
2777 /* Ignore string tables named .stabstr, as they contain
2779 && 0 != memcmp(".stabstr", sh_strtab + shdr[i].sh_name, 8)
2781 ptr = ehdrC + shdr[i].sh_offset;
2788 #if defined(ia64_HOST_ARCH)
2790 findElfSegment ( void* objImage, Elf_Addr vaddr )
2792 char* ehdrC = (char*)objImage;
2793 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2794 Elf_Phdr* phdr = (Elf_Phdr*)(ehdrC + ehdr->e_phoff);
2795 Elf_Addr segaddr = 0;
2798 for (i = 0; i < ehdr->e_phnum; i++) {
2799 segaddr = phdr[i].p_vaddr;
2800 if ((vaddr >= segaddr) && (vaddr < segaddr + phdr[i].p_memsz))
2808 ocVerifyImage_ELF ( ObjectCode* oc )
2812 int i, j, nent, nstrtab, nsymtabs;
2816 char* ehdrC = (char*)(oc->image);
2817 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2819 if (ehdr->e_ident[EI_MAG0] != ELFMAG0 ||
2820 ehdr->e_ident[EI_MAG1] != ELFMAG1 ||
2821 ehdr->e_ident[EI_MAG2] != ELFMAG2 ||
2822 ehdr->e_ident[EI_MAG3] != ELFMAG3) {
2823 errorBelch("%s: not an ELF object", oc->fileName);
2827 if (ehdr->e_ident[EI_CLASS] != ELFCLASS) {
2828 errorBelch("%s: unsupported ELF format", oc->fileName);
2832 if (ehdr->e_ident[EI_DATA] == ELFDATA2LSB) {
2833 IF_DEBUG(linker,debugBelch( "Is little-endian\n" ));
2835 if (ehdr->e_ident[EI_DATA] == ELFDATA2MSB) {
2836 IF_DEBUG(linker,debugBelch( "Is big-endian\n" ));
2838 errorBelch("%s: unknown endiannness", oc->fileName);
2842 if (ehdr->e_type != ET_REL) {
2843 errorBelch("%s: not a relocatable object (.o) file", oc->fileName);
2846 IF_DEBUG(linker, debugBelch( "Is a relocatable object (.o) file\n" ));
2848 IF_DEBUG(linker,debugBelch( "Architecture is " ));
2849 switch (ehdr->e_machine) {
2850 case EM_386: IF_DEBUG(linker,debugBelch( "x86" )); break;
2851 #ifdef EM_SPARC32PLUS
2852 case EM_SPARC32PLUS:
2854 case EM_SPARC: IF_DEBUG(linker,debugBelch( "sparc" )); break;
2856 case EM_IA_64: IF_DEBUG(linker,debugBelch( "ia64" )); break;
2858 case EM_PPC: IF_DEBUG(linker,debugBelch( "powerpc32" )); break;
2860 case EM_X86_64: IF_DEBUG(linker,debugBelch( "x86_64" )); break;
2862 default: IF_DEBUG(linker,debugBelch( "unknown" ));
2863 errorBelch("%s: unknown architecture", oc->fileName);
2867 IF_DEBUG(linker,debugBelch(
2868 "\nSection header table: start %ld, n_entries %d, ent_size %d\n",
2869 (long)ehdr->e_shoff, ehdr->e_shnum, ehdr->e_shentsize ));
2871 ASSERT (ehdr->e_shentsize == sizeof(Elf_Shdr));
2873 shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
2875 if (ehdr->e_shstrndx == SHN_UNDEF) {
2876 errorBelch("%s: no section header string table", oc->fileName);
2879 IF_DEBUG(linker,debugBelch( "Section header string table is section %d\n",
2881 sh_strtab = ehdrC + shdr[ehdr->e_shstrndx].sh_offset;
2884 for (i = 0; i < ehdr->e_shnum; i++) {
2885 IF_DEBUG(linker,debugBelch("%2d: ", i ));
2886 IF_DEBUG(linker,debugBelch("type=%2d ", (int)shdr[i].sh_type ));
2887 IF_DEBUG(linker,debugBelch("size=%4d ", (int)shdr[i].sh_size ));
2888 IF_DEBUG(linker,debugBelch("offs=%4d ", (int)shdr[i].sh_offset ));
2889 IF_DEBUG(linker,debugBelch(" (%p .. %p) ",
2890 ehdrC + shdr[i].sh_offset,
2891 ehdrC + shdr[i].sh_offset + shdr[i].sh_size - 1));
2893 if (shdr[i].sh_type == SHT_REL) {
2894 IF_DEBUG(linker,debugBelch("Rel " ));
2895 } else if (shdr[i].sh_type == SHT_RELA) {
2896 IF_DEBUG(linker,debugBelch("RelA " ));
2898 IF_DEBUG(linker,debugBelch(" "));
2901 IF_DEBUG(linker,debugBelch("sname=%s\n", sh_strtab + shdr[i].sh_name ));
2905 IF_DEBUG(linker,debugBelch( "\nString tables" ));
2908 for (i = 0; i < ehdr->e_shnum; i++) {
2909 if (shdr[i].sh_type == SHT_STRTAB
2910 /* Ignore the section header's string table. */
2911 && i != ehdr->e_shstrndx
2912 /* Ignore string tables named .stabstr, as they contain
2914 && 0 != memcmp(".stabstr", sh_strtab + shdr[i].sh_name, 8)
2916 IF_DEBUG(linker,debugBelch(" section %d is a normal string table", i ));
2917 strtab = ehdrC + shdr[i].sh_offset;
2922 errorBelch("%s: no string tables, or too many", oc->fileName);
2927 IF_DEBUG(linker,debugBelch( "\nSymbol tables" ));
2928 for (i = 0; i < ehdr->e_shnum; i++) {
2929 if (shdr[i].sh_type != SHT_SYMTAB) continue;
2930 IF_DEBUG(linker,debugBelch( "section %d is a symbol table\n", i ));
2932 stab = (Elf_Sym*) (ehdrC + shdr[i].sh_offset);
2933 nent = shdr[i].sh_size / sizeof(Elf_Sym);
2934 IF_DEBUG(linker,debugBelch( " number of entries is apparently %d (%ld rem)\n",
2936 (long)shdr[i].sh_size % sizeof(Elf_Sym)
2938 if (0 != shdr[i].sh_size % sizeof(Elf_Sym)) {
2939 errorBelch("%s: non-integral number of symbol table entries", oc->fileName);
2942 for (j = 0; j < nent; j++) {
2943 IF_DEBUG(linker,debugBelch(" %2d ", j ));
2944 IF_DEBUG(linker,debugBelch(" sec=%-5d size=%-3d val=%5p ",
2945 (int)stab[j].st_shndx,
2946 (int)stab[j].st_size,
2947 (char*)stab[j].st_value ));
2949 IF_DEBUG(linker,debugBelch("type=" ));
2950 switch (ELF_ST_TYPE(stab[j].st_info)) {
2951 case STT_NOTYPE: IF_DEBUG(linker,debugBelch("notype " )); break;
2952 case STT_OBJECT: IF_DEBUG(linker,debugBelch("object " )); break;
2953 case STT_FUNC : IF_DEBUG(linker,debugBelch("func " )); break;
2954 case STT_SECTION: IF_DEBUG(linker,debugBelch("section" )); break;
2955 case STT_FILE: IF_DEBUG(linker,debugBelch("file " )); break;
2956 default: IF_DEBUG(linker,debugBelch("? " )); break;
2958 IF_DEBUG(linker,debugBelch(" " ));
2960 IF_DEBUG(linker,debugBelch("bind=" ));
2961 switch (ELF_ST_BIND(stab[j].st_info)) {
2962 case STB_LOCAL : IF_DEBUG(linker,debugBelch("local " )); break;
2963 case STB_GLOBAL: IF_DEBUG(linker,debugBelch("global" )); break;
2964 case STB_WEAK : IF_DEBUG(linker,debugBelch("weak " )); break;
2965 default: IF_DEBUG(linker,debugBelch("? " )); break;
2967 IF_DEBUG(linker,debugBelch(" " ));
2969 IF_DEBUG(linker,debugBelch("name=%s\n", strtab + stab[j].st_name ));
2973 if (nsymtabs == 0) {
2974 errorBelch("%s: didn't find any symbol tables", oc->fileName);
2981 static int getSectionKind_ELF( Elf_Shdr *hdr, int *is_bss )
2985 if (hdr->sh_type == SHT_PROGBITS
2986 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_EXECINSTR)) {
2987 /* .text-style section */
2988 return SECTIONKIND_CODE_OR_RODATA;
2991 if (hdr->sh_type == SHT_PROGBITS
2992 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_WRITE)) {
2993 /* .data-style section */
2994 return SECTIONKIND_RWDATA;
2997 if (hdr->sh_type == SHT_PROGBITS
2998 && (hdr->sh_flags & SHF_ALLOC) && !(hdr->sh_flags & SHF_WRITE)) {
2999 /* .rodata-style section */
3000 return SECTIONKIND_CODE_OR_RODATA;
3003 if (hdr->sh_type == SHT_NOBITS
3004 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_WRITE)) {
3005 /* .bss-style section */
3007 return SECTIONKIND_RWDATA;
3010 return SECTIONKIND_OTHER;
3015 ocGetNames_ELF ( ObjectCode* oc )
3020 char* ehdrC = (char*)(oc->image);
3021 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
3022 char* strtab = findElfSection ( ehdrC, SHT_STRTAB );
3023 Elf_Shdr* shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
3025 ASSERT(symhash != NULL);
3028 errorBelch("%s: no strtab", oc->fileName);
3033 for (i = 0; i < ehdr->e_shnum; i++) {
3034 /* Figure out what kind of section it is. Logic derived from
3035 Figure 1.14 ("Special Sections") of the ELF document
3036 ("Portable Formats Specification, Version 1.1"). */
3038 SectionKind kind = getSectionKind_ELF(&shdr[i], &is_bss);
3040 if (is_bss && shdr[i].sh_size > 0) {
3041 /* This is a non-empty .bss section. Allocate zeroed space for
3042 it, and set its .sh_offset field such that
3043 ehdrC + .sh_offset == addr_of_zeroed_space. */
3044 char* zspace = stgCallocBytes(1, shdr[i].sh_size,
3045 "ocGetNames_ELF(BSS)");
3046 shdr[i].sh_offset = ((char*)zspace) - ((char*)ehdrC);
3048 debugBelch("BSS section at 0x%x, size %d\n",
3049 zspace, shdr[i].sh_size);
3053 /* fill in the section info */
3054 if (kind != SECTIONKIND_OTHER && shdr[i].sh_size > 0) {
3055 addProddableBlock(oc, ehdrC + shdr[i].sh_offset, shdr[i].sh_size);
3056 addSection(oc, kind, ehdrC + shdr[i].sh_offset,
3057 ehdrC + shdr[i].sh_offset + shdr[i].sh_size - 1);
3060 if (shdr[i].sh_type != SHT_SYMTAB) continue;
3062 /* copy stuff into this module's object symbol table */
3063 stab = (Elf_Sym*) (ehdrC + shdr[i].sh_offset);
3064 nent = shdr[i].sh_size / sizeof(Elf_Sym);
3066 oc->n_symbols = nent;
3067 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
3068 "ocGetNames_ELF(oc->symbols)");
3070 for (j = 0; j < nent; j++) {
3072 char isLocal = FALSE; /* avoids uninit-var warning */
3074 char* nm = strtab + stab[j].st_name;
3075 int secno = stab[j].st_shndx;
3077 /* Figure out if we want to add it; if so, set ad to its
3078 address. Otherwise leave ad == NULL. */
3080 if (secno == SHN_COMMON) {
3082 ad = stgCallocBytes(1, stab[j].st_size, "ocGetNames_ELF(COMMON)");
3084 debugBelch("COMMON symbol, size %d name %s\n",
3085 stab[j].st_size, nm);
3087 /* Pointless to do addProddableBlock() for this area,
3088 since the linker should never poke around in it. */
3091 if ( ( ELF_ST_BIND(stab[j].st_info)==STB_GLOBAL
3092 || ELF_ST_BIND(stab[j].st_info)==STB_LOCAL
3094 /* and not an undefined symbol */
3095 && stab[j].st_shndx != SHN_UNDEF
3096 /* and not in a "special section" */
3097 && stab[j].st_shndx < SHN_LORESERVE
3099 /* and it's a not a section or string table or anything silly */
3100 ( ELF_ST_TYPE(stab[j].st_info)==STT_FUNC ||
3101 ELF_ST_TYPE(stab[j].st_info)==STT_OBJECT ||
3102 ELF_ST_TYPE(stab[j].st_info)==STT_NOTYPE
3105 /* Section 0 is the undefined section, hence > and not >=. */
3106 ASSERT(secno > 0 && secno < ehdr->e_shnum);
3108 if (shdr[secno].sh_type == SHT_NOBITS) {
3109 debugBelch(" BSS symbol, size %d off %d name %s\n",
3110 stab[j].st_size, stab[j].st_value, nm);
3113 ad = ehdrC + shdr[ secno ].sh_offset + stab[j].st_value;
3114 if (ELF_ST_BIND(stab[j].st_info)==STB_LOCAL) {
3117 #ifdef ELF_FUNCTION_DESC
3118 /* dlsym() and the initialisation table both give us function
3119 * descriptors, so to be consistent we store function descriptors
3120 * in the symbol table */
3121 if (ELF_ST_TYPE(stab[j].st_info) == STT_FUNC)
3122 ad = (char *)allocateFunctionDesc((Elf_Addr)ad);
3124 IF_DEBUG(linker,debugBelch( "addOTabName(GLOB): %10p %s %s",
3125 ad, oc->fileName, nm ));
3130 /* And the decision is ... */
3134 oc->symbols[j] = nm;
3137 /* Ignore entirely. */
3139 ghciInsertStrHashTable(oc->fileName, symhash, nm, ad);
3143 IF_DEBUG(linker,debugBelch( "skipping `%s'\n",
3144 strtab + stab[j].st_name ));
3147 "skipping bind = %d, type = %d, shndx = %d `%s'\n",
3148 (int)ELF_ST_BIND(stab[j].st_info),
3149 (int)ELF_ST_TYPE(stab[j].st_info),
3150 (int)stab[j].st_shndx,
3151 strtab + stab[j].st_name
3154 oc->symbols[j] = NULL;
3163 /* Do ELF relocations which lack an explicit addend. All x86-linux
3164 relocations appear to be of this form. */
3166 do_Elf_Rel_relocations ( ObjectCode* oc, char* ehdrC,
3167 Elf_Shdr* shdr, int shnum,
3168 Elf_Sym* stab, char* strtab )
3173 Elf_Rel* rtab = (Elf_Rel*) (ehdrC + shdr[shnum].sh_offset);
3174 int nent = shdr[shnum].sh_size / sizeof(Elf_Rel);
3175 int target_shndx = shdr[shnum].sh_info;
3176 int symtab_shndx = shdr[shnum].sh_link;
3178 stab = (Elf_Sym*) (ehdrC + shdr[ symtab_shndx ].sh_offset);
3179 targ = (Elf_Word*)(ehdrC + shdr[ target_shndx ].sh_offset);
3180 IF_DEBUG(linker,debugBelch( "relocations for section %d using symtab %d\n",
3181 target_shndx, symtab_shndx ));
3183 /* Skip sections that we're not interested in. */
3186 SectionKind kind = getSectionKind_ELF(&shdr[target_shndx], &is_bss);
3187 if (kind == SECTIONKIND_OTHER) {
3188 IF_DEBUG(linker,debugBelch( "skipping (target section not loaded)"));
3193 for (j = 0; j < nent; j++) {
3194 Elf_Addr offset = rtab[j].r_offset;
3195 Elf_Addr info = rtab[j].r_info;
3197 Elf_Addr P = ((Elf_Addr)targ) + offset;
3198 Elf_Word* pP = (Elf_Word*)P;
3203 StgStablePtr stablePtr;
3206 IF_DEBUG(linker,debugBelch( "Rel entry %3d is raw(%6p %6p)",
3207 j, (void*)offset, (void*)info ));
3209 IF_DEBUG(linker,debugBelch( " ZERO" ));
3212 Elf_Sym sym = stab[ELF_R_SYM(info)];
3213 /* First see if it is a local symbol. */
3214 if (ELF_ST_BIND(sym.st_info) == STB_LOCAL) {
3215 /* Yes, so we can get the address directly from the ELF symbol
3217 symbol = sym.st_name==0 ? "(noname)" : strtab+sym.st_name;
3219 (ehdrC + shdr[ sym.st_shndx ].sh_offset
3220 + stab[ELF_R_SYM(info)].st_value);
3223 symbol = strtab + sym.st_name;
3224 stablePtr = (StgStablePtr)lookupHashTable(stablehash, (StgWord)symbol);
3225 if (NULL == stablePtr) {
3226 /* No, so look up the name in our global table. */
3227 S_tmp = lookupSymbol( symbol );
3228 S = (Elf_Addr)S_tmp;
3230 stableVal = deRefStablePtr( stablePtr );
3232 S = (Elf_Addr)S_tmp;
3236 errorBelch("%s: unknown symbol `%s'", oc->fileName, symbol);
3239 IF_DEBUG(linker,debugBelch( "`%s' resolves to %p\n", symbol, (void*)S ));
3242 IF_DEBUG(linker,debugBelch( "Reloc: P = %p S = %p A = %p\n",
3243 (void*)P, (void*)S, (void*)A ));
3244 checkProddableBlock ( oc, pP );
3248 switch (ELF_R_TYPE(info)) {
3249 # ifdef i386_HOST_ARCH
3250 case R_386_32: *pP = value; break;
3251 case R_386_PC32: *pP = value - P; break;
3254 errorBelch("%s: unhandled ELF relocation(Rel) type %lu\n",
3255 oc->fileName, (lnat)ELF_R_TYPE(info));
3263 /* Do ELF relocations for which explicit addends are supplied.
3264 sparc-solaris relocations appear to be of this form. */
3266 do_Elf_Rela_relocations ( ObjectCode* oc, char* ehdrC,
3267 Elf_Shdr* shdr, int shnum,
3268 Elf_Sym* stab, char* strtab )
3271 char *symbol = NULL;
3273 Elf_Rela* rtab = (Elf_Rela*) (ehdrC + shdr[shnum].sh_offset);
3274 int nent = shdr[shnum].sh_size / sizeof(Elf_Rela);
3275 int target_shndx = shdr[shnum].sh_info;
3276 int symtab_shndx = shdr[shnum].sh_link;
3278 stab = (Elf_Sym*) (ehdrC + shdr[ symtab_shndx ].sh_offset);
3279 targ = (Elf_Addr) (ehdrC + shdr[ target_shndx ].sh_offset);
3280 IF_DEBUG(linker,debugBelch( "relocations for section %d using symtab %d\n",
3281 target_shndx, symtab_shndx ));
3283 for (j = 0; j < nent; j++) {
3284 #if defined(DEBUG) || defined(sparc_HOST_ARCH) || defined(ia64_HOST_ARCH) || defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH)
3285 /* This #ifdef only serves to avoid unused-var warnings. */
3286 Elf_Addr offset = rtab[j].r_offset;
3287 Elf_Addr P = targ + offset;
3289 Elf_Addr info = rtab[j].r_info;
3290 Elf_Addr A = rtab[j].r_addend;
3294 # if defined(sparc_HOST_ARCH)
3295 Elf_Word* pP = (Elf_Word*)P;
3297 # elif defined(ia64_HOST_ARCH)
3298 Elf64_Xword *pP = (Elf64_Xword *)P;
3300 # elif defined(powerpc_HOST_ARCH)
3304 IF_DEBUG(linker,debugBelch( "Rel entry %3d is raw(%6p %6p %6p) ",
3305 j, (void*)offset, (void*)info,
3308 IF_DEBUG(linker,debugBelch( " ZERO" ));
3311 Elf_Sym sym = stab[ELF_R_SYM(info)];
3312 /* First see if it is a local symbol. */
3313 if (ELF_ST_BIND(sym.st_info) == STB_LOCAL) {
3314 /* Yes, so we can get the address directly from the ELF symbol
3316 symbol = sym.st_name==0 ? "(noname)" : strtab+sym.st_name;
3318 (ehdrC + shdr[ sym.st_shndx ].sh_offset
3319 + stab[ELF_R_SYM(info)].st_value);
3320 #ifdef ELF_FUNCTION_DESC
3321 /* Make a function descriptor for this function */
3322 if (S && ELF_ST_TYPE(sym.st_info) == STT_FUNC) {
3323 S = allocateFunctionDesc(S + A);
3328 /* No, so look up the name in our global table. */
3329 symbol = strtab + sym.st_name;
3330 S_tmp = lookupSymbol( symbol );
3331 S = (Elf_Addr)S_tmp;
3333 #ifdef ELF_FUNCTION_DESC
3334 /* If a function, already a function descriptor - we would
3335 have to copy it to add an offset. */
3336 if (S && (ELF_ST_TYPE(sym.st_info) == STT_FUNC) && (A != 0))
3337 errorBelch("%s: function %s with addend %p", oc->fileName, symbol, (void *)A);
3341 errorBelch("%s: unknown symbol `%s'", oc->fileName, symbol);
3344 IF_DEBUG(linker,debugBelch( "`%s' resolves to %p", symbol, (void*)S ));
3347 IF_DEBUG(linker,debugBelch("Reloc: P = %p S = %p A = %p\n",
3348 (void*)P, (void*)S, (void*)A ));
3349 /* checkProddableBlock ( oc, (void*)P ); */
3353 switch (ELF_R_TYPE(info)) {
3354 # if defined(sparc_HOST_ARCH)
3355 case R_SPARC_WDISP30:
3356 w1 = *pP & 0xC0000000;
3357 w2 = (Elf_Word)((value - P) >> 2);
3358 ASSERT((w2 & 0xC0000000) == 0);
3363 w1 = *pP & 0xFFC00000;
3364 w2 = (Elf_Word)(value >> 10);
3365 ASSERT((w2 & 0xFFC00000) == 0);
3371 w2 = (Elf_Word)(value & 0x3FF);
3372 ASSERT((w2 & ~0x3FF) == 0);
3376 /* According to the Sun documentation:
3378 This relocation type resembles R_SPARC_32, except it refers to an
3379 unaligned word. That is, the word to be relocated must be treated
3380 as four separate bytes with arbitrary alignment, not as a word
3381 aligned according to the architecture requirements.
3383 (JRS: which means that freeloading on the R_SPARC_32 case
3384 is probably wrong, but hey ...)
3388 w2 = (Elf_Word)value;
3391 # elif defined(ia64_HOST_ARCH)
3392 case R_IA64_DIR64LSB:
3393 case R_IA64_FPTR64LSB:
3396 case R_IA64_PCREL64LSB:
3399 case R_IA64_SEGREL64LSB:
3400 addr = findElfSegment(ehdrC, value);
3403 case R_IA64_GPREL22:
3404 ia64_reloc_gprel22(P, value);
3406 case R_IA64_LTOFF22:
3407 case R_IA64_LTOFF22X:
3408 case R_IA64_LTOFF_FPTR22:
3409 addr = allocateGOTEntry(value);
3410 ia64_reloc_gprel22(P, addr);
3412 case R_IA64_PCREL21B:
3413 ia64_reloc_pcrel21(P, S, oc);
3416 /* This goes with R_IA64_LTOFF22X and points to the load to
3417 * convert into a move. We don't implement relaxation. */
3419 # elif defined(powerpc_HOST_ARCH)
3420 case R_PPC_ADDR16_LO:
3421 *(Elf32_Half*) P = value;
3424 case R_PPC_ADDR16_HI:
3425 *(Elf32_Half*) P = value >> 16;
3428 case R_PPC_ADDR16_HA:
3429 *(Elf32_Half*) P = (value + 0x8000) >> 16;
3433 *(Elf32_Word *) P = value;
3437 *(Elf32_Word *) P = value - P;
3443 if( delta << 6 >> 6 != delta )
3445 value = (Elf_Addr) (&makeSymbolExtra( oc, ELF_R_SYM(info), value )
3449 if( value == 0 || delta << 6 >> 6 != delta )
3451 barf( "Unable to make SymbolExtra for #%d",
3457 *(Elf_Word *) P = (*(Elf_Word *) P & 0xfc000003)
3458 | (delta & 0x3fffffc);
3462 #if x86_64_HOST_ARCH
3464 *(Elf64_Xword *)P = value;
3469 StgInt64 off = value - P;
3470 if (off >= 0x7fffffffL || off < -0x80000000L) {
3471 barf("R_X86_64_PC32 relocation out of range: %s = %p",
3474 *(Elf64_Word *)P = (Elf64_Word)off;
3479 if (value >= 0x7fffffffL) {
3480 barf("R_X86_64_32 relocation out of range: %s = %p\n",
3483 *(Elf64_Word *)P = (Elf64_Word)value;
3487 if ((StgInt64)value > 0x7fffffffL || (StgInt64)value < -0x80000000L) {
3488 barf("R_X86_64_32S relocation out of range: %s = %p\n",
3491 *(Elf64_Sword *)P = (Elf64_Sword)value;
3496 errorBelch("%s: unhandled ELF relocation(RelA) type %lu\n",
3497 oc->fileName, (lnat)ELF_R_TYPE(info));
3506 ocResolve_ELF ( ObjectCode* oc )
3510 Elf_Sym* stab = NULL;
3511 char* ehdrC = (char*)(oc->image);
3512 Elf_Ehdr* ehdr = (Elf_Ehdr*) ehdrC;
3513 Elf_Shdr* shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
3515 /* first find "the" symbol table */
3516 stab = (Elf_Sym*) findElfSection ( ehdrC, SHT_SYMTAB );
3518 /* also go find the string table */
3519 strtab = findElfSection ( ehdrC, SHT_STRTAB );
3521 if (stab == NULL || strtab == NULL) {
3522 errorBelch("%s: can't find string or symbol table", oc->fileName);
3526 /* Process the relocation sections. */
3527 for (shnum = 0; shnum < ehdr->e_shnum; shnum++) {
3528 if (shdr[shnum].sh_type == SHT_REL) {
3529 ok = do_Elf_Rel_relocations ( oc, ehdrC, shdr,
3530 shnum, stab, strtab );
3534 if (shdr[shnum].sh_type == SHT_RELA) {
3535 ok = do_Elf_Rela_relocations ( oc, ehdrC, shdr,
3536 shnum, stab, strtab );
3541 /* Free the local symbol table; we won't need it again. */
3542 freeHashTable(oc->lochash, NULL);
3545 #if defined(powerpc_HOST_ARCH)
3546 ocFlushInstructionCache( oc );
3554 * Instructions are 41 bits long, packed into 128 bit bundles with a 5-bit template
3555 * at the front. The following utility functions pack and unpack instructions, and
3556 * take care of the most common relocations.
3559 #ifdef ia64_HOST_ARCH
3562 ia64_extract_instruction(Elf64_Xword *target)
3565 int slot = (Elf_Addr)target & 3;
3566 target = (Elf_Addr)target & ~3;
3574 return ((w1 >> 5) & 0x1ffffffffff);
3576 return (w1 >> 46) | ((w2 & 0x7fffff) << 18);
3580 barf("ia64_extract_instruction: invalid slot %p", target);
3585 ia64_deposit_instruction(Elf64_Xword *target, Elf64_Xword value)
3587 int slot = (Elf_Addr)target & 3;
3588 target = (Elf_Addr)target & ~3;
3593 *target |= value << 5;
3596 *target |= value << 46;
3597 *(target+1) |= value >> 18;
3600 *(target+1) |= value << 23;
3606 ia64_reloc_gprel22(Elf_Addr target, Elf_Addr value)
3608 Elf64_Xword instruction;
3609 Elf64_Sxword rel_value;
3611 rel_value = value - gp_val;
3612 if ((rel_value > 0x1fffff) || (rel_value < -0x1fffff))
3613 barf("GP-relative data out of range (address = 0x%lx, gp = 0x%lx)", value, gp_val);
3615 instruction = ia64_extract_instruction((Elf64_Xword *)target);
3616 instruction |= (((rel_value >> 0) & 0x07f) << 13) /* imm7b */
3617 | (((rel_value >> 7) & 0x1ff) << 27) /* imm9d */
3618 | (((rel_value >> 16) & 0x01f) << 22) /* imm5c */
3619 | ((Elf64_Xword)(rel_value < 0) << 36); /* s */
3620 ia64_deposit_instruction((Elf64_Xword *)target, instruction);
3624 ia64_reloc_pcrel21(Elf_Addr target, Elf_Addr value, ObjectCode *oc)
3626 Elf64_Xword instruction;
3627 Elf64_Sxword rel_value;
3630 entry = allocatePLTEntry(value, oc);
3632 rel_value = (entry >> 4) - (target >> 4);
3633 if ((rel_value > 0xfffff) || (rel_value < -0xfffff))
3634 barf("PLT entry too far away (entry = 0x%lx, target = 0x%lx)", entry, target);
3636 instruction = ia64_extract_instruction((Elf64_Xword *)target);
3637 instruction |= ((rel_value & 0xfffff) << 13) /* imm20b */
3638 | ((Elf64_Xword)(rel_value < 0) << 36); /* s */
3639 ia64_deposit_instruction((Elf64_Xword *)target, instruction);
3645 * PowerPC ELF specifics
3648 #ifdef powerpc_HOST_ARCH
3650 static int ocAllocateSymbolExtras_ELF( ObjectCode *oc )
3656 ehdr = (Elf_Ehdr *) oc->image;
3657 shdr = (Elf_Shdr *) ( ((char *)oc->image) + ehdr->e_shoff );
3659 for( i = 0; i < ehdr->e_shnum; i++ )
3660 if( shdr[i].sh_type == SHT_SYMTAB )
3663 if( i == ehdr->e_shnum )
3665 errorBelch( "This ELF file contains no symtab" );
3669 if( shdr[i].sh_entsize != sizeof( Elf_Sym ) )
3671 errorBelch( "The entry size (%d) of the symtab isn't %d\n",
3672 shdr[i].sh_entsize, sizeof( Elf_Sym ) );
3677 return ocAllocateSymbolExtras( oc, shdr[i].sh_size / sizeof( Elf_Sym ), 0 );
3680 #endif /* powerpc */
3684 /* --------------------------------------------------------------------------
3686 * ------------------------------------------------------------------------*/
3688 #if defined(OBJFORMAT_MACHO)
3691 Support for MachO linking on Darwin/MacOS X
3692 by Wolfgang Thaller (wolfgang.thaller@gmx.net)
3694 I hereby formally apologize for the hackish nature of this code.
3695 Things that need to be done:
3696 *) implement ocVerifyImage_MachO
3697 *) add still more sanity checks.
3700 #if x86_64_HOST_ARCH || powerpc64_HOST_ARCH
3701 #define mach_header mach_header_64
3702 #define segment_command segment_command_64
3703 #define section section_64
3704 #define nlist nlist_64
3707 #ifdef powerpc_HOST_ARCH
3708 static int ocAllocateSymbolExtras_MachO(ObjectCode* oc)
3710 struct mach_header *header = (struct mach_header *) oc->image;
3711 struct load_command *lc = (struct load_command *) (header + 1);
3714 for( i = 0; i < header->ncmds; i++ )
3716 if( lc->cmd == LC_SYMTAB )
3718 // Find out the first and last undefined external
3719 // symbol, so we don't have to allocate too many
3721 struct symtab_command *symLC = (struct symtab_command *) lc;
3722 unsigned min = symLC->nsyms, max = 0;
3723 struct nlist *nlist =
3724 symLC ? (struct nlist*) ((char*) oc->image + symLC->symoff)
3726 for(i=0;i<symLC->nsyms;i++)
3728 if(nlist[i].n_type & N_STAB)
3730 else if(nlist[i].n_type & N_EXT)
3732 if((nlist[i].n_type & N_TYPE) == N_UNDF
3733 && (nlist[i].n_value == 0))
3743 return ocAllocateSymbolExtras(oc, max - min + 1, min);
3748 lc = (struct load_command *) ( ((char *)lc) + lc->cmdsize );
3750 return ocAllocateSymbolExtras(oc,0,0);
3753 #ifdef x86_64_HOST_ARCH
3754 static int ocAllocateSymbolExtras_MachO(ObjectCode* oc)
3756 struct mach_header *header = (struct mach_header *) oc->image;
3757 struct load_command *lc = (struct load_command *) (header + 1);
3760 for( i = 0; i < header->ncmds; i++ )
3762 if( lc->cmd == LC_SYMTAB )
3764 // Just allocate one entry for every symbol
3765 struct symtab_command *symLC = (struct symtab_command *) lc;
3767 return ocAllocateSymbolExtras(oc, symLC->nsyms, 0);
3770 lc = (struct load_command *) ( ((char *)lc) + lc->cmdsize );
3772 return ocAllocateSymbolExtras(oc,0,0);
3776 static int ocVerifyImage_MachO(ObjectCode* oc)
3778 char *image = (char*) oc->image;
3779 struct mach_header *header = (struct mach_header*) image;
3781 #if x86_64_TARGET_ARCH || powerpc64_TARGET_ARCH
3782 if(header->magic != MH_MAGIC_64)
3785 if(header->magic != MH_MAGIC)
3788 // FIXME: do some more verifying here
3792 static int resolveImports(
3795 struct symtab_command *symLC,
3796 struct section *sect, // ptr to lazy or non-lazy symbol pointer section
3797 unsigned long *indirectSyms,
3798 struct nlist *nlist)
3801 size_t itemSize = 4;
3804 int isJumpTable = 0;
3805 if(!strcmp(sect->sectname,"__jump_table"))
3809 ASSERT(sect->reserved2 == itemSize);
3813 for(i=0; i*itemSize < sect->size;i++)
3815 // according to otool, reserved1 contains the first index into the indirect symbol table
3816 struct nlist *symbol = &nlist[indirectSyms[sect->reserved1+i]];
3817 char *nm = image + symLC->stroff + symbol->n_un.n_strx;
3820 if((symbol->n_type & N_TYPE) == N_UNDF
3821 && (symbol->n_type & N_EXT) && (symbol->n_value != 0))
3822 addr = (void*) (symbol->n_value);
3823 else if((addr = lookupLocalSymbol(oc,nm)) != NULL)
3826 addr = lookupSymbol(nm);
3829 errorBelch("\n%s: unknown symbol `%s'", oc->fileName, nm);
3837 checkProddableBlock(oc,image + sect->offset + i*itemSize);
3838 *(image + sect->offset + i*itemSize) = 0xe9; // jmp
3839 *(unsigned*)(image + sect->offset + i*itemSize + 1)
3840 = (char*)addr - (image + sect->offset + i*itemSize + 5);
3845 checkProddableBlock(oc,((void**)(image + sect->offset)) + i);
3846 ((void**)(image + sect->offset))[i] = addr;
3853 static unsigned long relocateAddress(
3856 struct section* sections,
3857 unsigned long address)
3860 for(i = 0; i < nSections; i++)
3862 if(sections[i].addr <= address
3863 && address < sections[i].addr + sections[i].size)
3865 return (unsigned long)oc->image
3866 + sections[i].offset + address - sections[i].addr;
3869 barf("Invalid Mach-O file:"
3870 "Address out of bounds while relocating object file");
3874 static int relocateSection(
3877 struct symtab_command *symLC, struct nlist *nlist,
3878 int nSections, struct section* sections, struct section *sect)
3880 struct relocation_info *relocs;
3883 if(!strcmp(sect->sectname,"__la_symbol_ptr"))
3885 else if(!strcmp(sect->sectname,"__nl_symbol_ptr"))
3887 else if(!strcmp(sect->sectname,"__la_sym_ptr2"))
3889 else if(!strcmp(sect->sectname,"__la_sym_ptr3"))
3893 relocs = (struct relocation_info*) (image + sect->reloff);
3897 #ifdef x86_64_HOST_ARCH
3898 struct relocation_info *reloc = &relocs[i];
3900 char *thingPtr = image + sect->offset + reloc->r_address;
3904 int type = reloc->r_type;
3906 checkProddableBlock(oc,thingPtr);
3907 switch(reloc->r_length)
3910 thing = *(uint8_t*)thingPtr;
3911 baseValue = (uint64_t)thingPtr + 1;
3914 thing = *(uint16_t*)thingPtr;
3915 baseValue = (uint64_t)thingPtr + 2;
3918 thing = *(uint32_t*)thingPtr;
3919 baseValue = (uint64_t)thingPtr + 4;
3922 thing = *(uint64_t*)thingPtr;
3923 baseValue = (uint64_t)thingPtr + 8;
3926 barf("Unknown size.");
3929 if(type == X86_64_RELOC_GOT
3930 || type == X86_64_RELOC_GOT_LOAD)
3932 ASSERT(reloc->r_extern);
3933 value = (uint64_t) &makeSymbolExtra(oc, reloc->r_symbolnum, value)->addr;
3935 type = X86_64_RELOC_SIGNED;
3937 else if(reloc->r_extern)
3939 struct nlist *symbol = &nlist[reloc->r_symbolnum];
3940 char *nm = image + symLC->stroff + symbol->n_un.n_strx;
3941 if(symbol->n_value == 0)
3942 value = (uint64_t) lookupSymbol(nm);
3944 value = relocateAddress(oc, nSections, sections,
3949 value = sections[reloc->r_symbolnum-1].offset
3950 - sections[reloc->r_symbolnum-1].addr
3954 if(type == X86_64_RELOC_BRANCH)
3956 if((int32_t)(value - baseValue) != (int64_t)(value - baseValue))
3958 ASSERT(reloc->r_extern);
3959 value = (uint64_t) &makeSymbolExtra(oc, reloc->r_symbolnum, value)
3962 ASSERT((int32_t)(value - baseValue) == (int64_t)(value - baseValue));
3963 type = X86_64_RELOC_SIGNED;
3968 case X86_64_RELOC_UNSIGNED:
3969 ASSERT(!reloc->r_pcrel);
3972 case X86_64_RELOC_SIGNED:
3973 ASSERT(reloc->r_pcrel);
3974 thing += value - baseValue;
3976 case X86_64_RELOC_SUBTRACTOR:
3977 ASSERT(!reloc->r_pcrel);
3981 barf("unkown relocation");
3984 switch(reloc->r_length)
3987 *(uint8_t*)thingPtr = thing;
3990 *(uint16_t*)thingPtr = thing;
3993 *(uint32_t*)thingPtr = thing;
3996 *(uint64_t*)thingPtr = thing;
4000 if(relocs[i].r_address & R_SCATTERED)
4002 struct scattered_relocation_info *scat =
4003 (struct scattered_relocation_info*) &relocs[i];
4007 if(scat->r_length == 2)
4009 unsigned long word = 0;
4010 unsigned long* wordPtr = (unsigned long*) (image + sect->offset + scat->r_address);
4011 checkProddableBlock(oc,wordPtr);
4013 // Note on relocation types:
4014 // i386 uses the GENERIC_RELOC_* types,
4015 // while ppc uses special PPC_RELOC_* types.
4016 // *_RELOC_VANILLA and *_RELOC_PAIR have the same value
4017 // in both cases, all others are different.
4018 // Therefore, we use GENERIC_RELOC_VANILLA
4019 // and GENERIC_RELOC_PAIR instead of the PPC variants,
4020 // and use #ifdefs for the other types.
4022 // Step 1: Figure out what the relocated value should be
4023 if(scat->r_type == GENERIC_RELOC_VANILLA)
4025 word = *wordPtr + (unsigned long) relocateAddress(
4032 #ifdef powerpc_HOST_ARCH
4033 else if(scat->r_type == PPC_RELOC_SECTDIFF
4034 || scat->r_type == PPC_RELOC_LO16_SECTDIFF
4035 || scat->r_type == PPC_RELOC_HI16_SECTDIFF
4036 || scat->r_type == PPC_RELOC_HA16_SECTDIFF)
4038 else if(scat->r_type == GENERIC_RELOC_SECTDIFF)
4041 struct scattered_relocation_info *pair =
4042 (struct scattered_relocation_info*) &relocs[i+1];
4044 if(!pair->r_scattered || pair->r_type != GENERIC_RELOC_PAIR)
4045 barf("Invalid Mach-O file: "
4046 "RELOC_*_SECTDIFF not followed by RELOC_PAIR");
4048 word = (unsigned long)
4049 (relocateAddress(oc, nSections, sections, scat->r_value)
4050 - relocateAddress(oc, nSections, sections, pair->r_value));
4053 #ifdef powerpc_HOST_ARCH
4054 else if(scat->r_type == PPC_RELOC_HI16
4055 || scat->r_type == PPC_RELOC_LO16
4056 || scat->r_type == PPC_RELOC_HA16
4057 || scat->r_type == PPC_RELOC_LO14)
4058 { // these are generated by label+offset things
4059 struct relocation_info *pair = &relocs[i+1];
4060 if((pair->r_address & R_SCATTERED) || pair->r_type != PPC_RELOC_PAIR)
4061 barf("Invalid Mach-O file: "
4062 "PPC_RELOC_* not followed by PPC_RELOC_PAIR");
4064 if(scat->r_type == PPC_RELOC_LO16)
4066 word = ((unsigned short*) wordPtr)[1];
4067 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
4069 else if(scat->r_type == PPC_RELOC_LO14)
4071 barf("Unsupported Relocation: PPC_RELOC_LO14");
4072 word = ((unsigned short*) wordPtr)[1] & 0xFFFC;
4073 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
4075 else if(scat->r_type == PPC_RELOC_HI16)
4077 word = ((unsigned short*) wordPtr)[1] << 16;
4078 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF);
4080 else if(scat->r_type == PPC_RELOC_HA16)
4082 word = ((unsigned short*) wordPtr)[1] << 16;
4083 word += ((short)relocs[i+1].r_address & (short)0xFFFF);
4087 word += (unsigned long) relocateAddress(oc, nSections, sections, scat->r_value)
4094 continue; // ignore the others
4096 #ifdef powerpc_HOST_ARCH
4097 if(scat->r_type == GENERIC_RELOC_VANILLA
4098 || scat->r_type == PPC_RELOC_SECTDIFF)
4100 if(scat->r_type == GENERIC_RELOC_VANILLA
4101 || scat->r_type == GENERIC_RELOC_SECTDIFF)
4106 #ifdef powerpc_HOST_ARCH
4107 else if(scat->r_type == PPC_RELOC_LO16_SECTDIFF || scat->r_type == PPC_RELOC_LO16)
4109 ((unsigned short*) wordPtr)[1] = word & 0xFFFF;
4111 else if(scat->r_type == PPC_RELOC_HI16_SECTDIFF || scat->r_type == PPC_RELOC_HI16)
4113 ((unsigned short*) wordPtr)[1] = (word >> 16) & 0xFFFF;
4115 else if(scat->r_type == PPC_RELOC_HA16_SECTDIFF || scat->r_type == PPC_RELOC_HA16)
4117 ((unsigned short*) wordPtr)[1] = ((word >> 16) & 0xFFFF)
4118 + ((word & (1<<15)) ? 1 : 0);
4124 continue; // FIXME: I hope it's OK to ignore all the others.
4128 struct relocation_info *reloc = &relocs[i];
4129 if(reloc->r_pcrel && !reloc->r_extern)
4132 if(reloc->r_length == 2)
4134 unsigned long word = 0;
4135 #ifdef powerpc_HOST_ARCH
4136 unsigned long jumpIsland = 0;
4137 long offsetToJumpIsland = 0xBADBAD42; // initialise to bad value
4138 // to avoid warning and to catch
4142 unsigned long* wordPtr = (unsigned long*) (image + sect->offset + reloc->r_address);
4143 checkProddableBlock(oc,wordPtr);
4145 if(reloc->r_type == GENERIC_RELOC_VANILLA)
4149 #ifdef powerpc_HOST_ARCH
4150 else if(reloc->r_type == PPC_RELOC_LO16)
4152 word = ((unsigned short*) wordPtr)[1];
4153 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
4155 else if(reloc->r_type == PPC_RELOC_HI16)
4157 word = ((unsigned short*) wordPtr)[1] << 16;
4158 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF);
4160 else if(reloc->r_type == PPC_RELOC_HA16)
4162 word = ((unsigned short*) wordPtr)[1] << 16;
4163 word += ((short)relocs[i+1].r_address & (short)0xFFFF);
4165 else if(reloc->r_type == PPC_RELOC_BR24)
4168 word = (word & 0x03FFFFFC) | ((word & 0x02000000) ? 0xFC000000 : 0);
4172 if(!reloc->r_extern)
4175 sections[reloc->r_symbolnum-1].offset
4176 - sections[reloc->r_symbolnum-1].addr
4183 struct nlist *symbol = &nlist[reloc->r_symbolnum];
4184 char *nm = image + symLC->stroff + symbol->n_un.n_strx;
4185 void *symbolAddress = lookupSymbol(nm);
4188 errorBelch("\nunknown symbol `%s'", nm);
4194 #ifdef powerpc_HOST_ARCH
4195 // In the .o file, this should be a relative jump to NULL
4196 // and we'll change it to a relative jump to the symbol
4197 ASSERT(-word == reloc->r_address);
4198 jumpIsland = (unsigned long)
4199 &makeSymbolExtra(oc,
4201 (unsigned long) symbolAddress)
4205 offsetToJumpIsland = word + jumpIsland
4206 - (((long)image) + sect->offset - sect->addr);
4209 word += (unsigned long) symbolAddress
4210 - (((long)image) + sect->offset - sect->addr);
4214 word += (unsigned long) symbolAddress;
4218 if(reloc->r_type == GENERIC_RELOC_VANILLA)
4223 #ifdef powerpc_HOST_ARCH
4224 else if(reloc->r_type == PPC_RELOC_LO16)
4226 ((unsigned short*) wordPtr)[1] = word & 0xFFFF;
4229 else if(reloc->r_type == PPC_RELOC_HI16)
4231 ((unsigned short*) wordPtr)[1] = (word >> 16) & 0xFFFF;
4234 else if(reloc->r_type == PPC_RELOC_HA16)
4236 ((unsigned short*) wordPtr)[1] = ((word >> 16) & 0xFFFF)
4237 + ((word & (1<<15)) ? 1 : 0);
4240 else if(reloc->r_type == PPC_RELOC_BR24)
4242 if((long)word > (long)0x01FFFFFF || (long)word < (long)0xFFE00000)
4244 // The branch offset is too large.
4245 // Therefore, we try to use a jump island.
4248 barf("unconditional relative branch out of range: "
4249 "no jump island available");
4252 word = offsetToJumpIsland;
4253 if((long)word > (long)0x01FFFFFF || (long)word < (long)0xFFE00000)
4254 barf("unconditional relative branch out of range: "
4255 "jump island out of range");
4257 *wordPtr = (*wordPtr & 0xFC000003) | (word & 0x03FFFFFC);
4262 barf("\nunknown relocation %d",reloc->r_type);
4270 static int ocGetNames_MachO(ObjectCode* oc)
4272 char *image = (char*) oc->image;
4273 struct mach_header *header = (struct mach_header*) image;
4274 struct load_command *lc = (struct load_command*) (image + sizeof(struct mach_header));
4275 unsigned i,curSymbol = 0;
4276 struct segment_command *segLC = NULL;
4277 struct section *sections;
4278 struct symtab_command *symLC = NULL;
4279 struct nlist *nlist;
4280 unsigned long commonSize = 0;
4281 char *commonStorage = NULL;
4282 unsigned long commonCounter;
4284 for(i=0;i<header->ncmds;i++)
4286 if(lc->cmd == LC_SEGMENT || lc->cmd == LC_SEGMENT_64)
4287 segLC = (struct segment_command*) lc;
4288 else if(lc->cmd == LC_SYMTAB)
4289 symLC = (struct symtab_command*) lc;
4290 lc = (struct load_command *) ( ((char*)lc) + lc->cmdsize );
4293 sections = (struct section*) (segLC+1);
4294 nlist = symLC ? (struct nlist*) (image + symLC->symoff)
4298 barf("ocGetNames_MachO: no segment load command");
4300 for(i=0;i<segLC->nsects;i++)
4302 if(sections[i].size == 0)
4305 if((sections[i].flags & SECTION_TYPE) == S_ZEROFILL)
4307 char * zeroFillArea = stgCallocBytes(1,sections[i].size,
4308 "ocGetNames_MachO(common symbols)");
4309 sections[i].offset = zeroFillArea - image;
4312 if(!strcmp(sections[i].sectname,"__text"))
4313 addSection(oc, SECTIONKIND_CODE_OR_RODATA,
4314 (void*) (image + sections[i].offset),
4315 (void*) (image + sections[i].offset + sections[i].size));
4316 else if(!strcmp(sections[i].sectname,"__const"))
4317 addSection(oc, SECTIONKIND_RWDATA,
4318 (void*) (image + sections[i].offset),
4319 (void*) (image + sections[i].offset + sections[i].size));
4320 else if(!strcmp(sections[i].sectname,"__data"))
4321 addSection(oc, SECTIONKIND_RWDATA,
4322 (void*) (image + sections[i].offset),
4323 (void*) (image + sections[i].offset + sections[i].size));
4324 else if(!strcmp(sections[i].sectname,"__bss")
4325 || !strcmp(sections[i].sectname,"__common"))
4326 addSection(oc, SECTIONKIND_RWDATA,
4327 (void*) (image + sections[i].offset),
4328 (void*) (image + sections[i].offset + sections[i].size));
4330 addProddableBlock(oc, (void*) (image + sections[i].offset),
4334 // count external symbols defined here
4338 for(i=0;i<symLC->nsyms;i++)
4340 if(nlist[i].n_type & N_STAB)
4342 else if(nlist[i].n_type & N_EXT)
4344 if((nlist[i].n_type & N_TYPE) == N_UNDF
4345 && (nlist[i].n_value != 0))
4347 commonSize += nlist[i].n_value;
4350 else if((nlist[i].n_type & N_TYPE) == N_SECT)
4355 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
4356 "ocGetNames_MachO(oc->symbols)");
4360 for(i=0;i<symLC->nsyms;i++)
4362 if(nlist[i].n_type & N_STAB)
4364 else if((nlist[i].n_type & N_TYPE) == N_SECT)
4366 if(nlist[i].n_type & N_EXT)
4368 char *nm = image + symLC->stroff + nlist[i].n_un.n_strx;
4369 if((nlist[i].n_desc & N_WEAK_DEF) && lookupSymbol(nm))
4370 ; // weak definition, and we already have a definition
4373 ghciInsertStrHashTable(oc->fileName, symhash, nm,
4375 + sections[nlist[i].n_sect-1].offset
4376 - sections[nlist[i].n_sect-1].addr
4377 + nlist[i].n_value);
4378 oc->symbols[curSymbol++] = nm;
4385 commonStorage = stgCallocBytes(1,commonSize,"ocGetNames_MachO(common symbols)");
4386 commonCounter = (unsigned long)commonStorage;
4389 for(i=0;i<symLC->nsyms;i++)
4391 if((nlist[i].n_type & N_TYPE) == N_UNDF
4392 && (nlist[i].n_type & N_EXT) && (nlist[i].n_value != 0))
4394 char *nm = image + symLC->stroff + nlist[i].n_un.n_strx;
4395 unsigned long sz = nlist[i].n_value;
4397 nlist[i].n_value = commonCounter;
4399 ghciInsertStrHashTable(oc->fileName, symhash, nm,
4400 (void*)commonCounter);
4401 oc->symbols[curSymbol++] = nm;
4403 commonCounter += sz;
4410 static int ocResolve_MachO(ObjectCode* oc)
4412 char *image = (char*) oc->image;
4413 struct mach_header *header = (struct mach_header*) image;
4414 struct load_command *lc = (struct load_command*) (image + sizeof(struct mach_header));
4416 struct segment_command *segLC = NULL;
4417 struct section *sections;
4418 struct symtab_command *symLC = NULL;
4419 struct dysymtab_command *dsymLC = NULL;
4420 struct nlist *nlist;
4422 for(i=0;i<header->ncmds;i++)
4424 if(lc->cmd == LC_SEGMENT || lc->cmd == LC_SEGMENT_64)
4425 segLC = (struct segment_command*) lc;
4426 else if(lc->cmd == LC_SYMTAB)
4427 symLC = (struct symtab_command*) lc;
4428 else if(lc->cmd == LC_DYSYMTAB)
4429 dsymLC = (struct dysymtab_command*) lc;
4430 lc = (struct load_command *) ( ((char*)lc) + lc->cmdsize );
4433 sections = (struct section*) (segLC+1);
4434 nlist = symLC ? (struct nlist*) (image + symLC->symoff)
4439 unsigned long *indirectSyms
4440 = (unsigned long*) (image + dsymLC->indirectsymoff);
4442 for(i=0;i<segLC->nsects;i++)
4444 if( !strcmp(sections[i].sectname,"__la_symbol_ptr")
4445 || !strcmp(sections[i].sectname,"__la_sym_ptr2")
4446 || !strcmp(sections[i].sectname,"__la_sym_ptr3"))
4448 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4451 else if(!strcmp(sections[i].sectname,"__nl_symbol_ptr")
4452 || !strcmp(sections[i].sectname,"__pointers"))
4454 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4457 else if(!strcmp(sections[i].sectname,"__jump_table"))
4459 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4465 for(i=0;i<segLC->nsects;i++)
4467 if(!relocateSection(oc,image,symLC,nlist,segLC->nsects,sections,§ions[i]))
4471 /* Free the local symbol table; we won't need it again. */
4472 freeHashTable(oc->lochash, NULL);
4475 #if defined (powerpc_HOST_ARCH)
4476 ocFlushInstructionCache( oc );
4482 #ifdef powerpc_HOST_ARCH
4484 * The Mach-O object format uses leading underscores. But not everywhere.
4485 * There is a small number of runtime support functions defined in
4486 * libcc_dynamic.a whose name does not have a leading underscore.
4487 * As a consequence, we can't get their address from C code.
4488 * We have to use inline assembler just to take the address of a function.
4492 static void machoInitSymbolsWithoutUnderscore()
4494 extern void* symbolsWithoutUnderscore[];
4495 void **p = symbolsWithoutUnderscore;
4496 __asm__ volatile(".globl _symbolsWithoutUnderscore\n.data\n_symbolsWithoutUnderscore:");
4500 __asm__ volatile(".long " # x);
4502 RTS_MACHO_NOUNDERLINE_SYMBOLS
4504 __asm__ volatile(".text");
4508 ghciInsertStrHashTable("(GHCi built-in symbols)", symhash, #x, *p++);
4510 RTS_MACHO_NOUNDERLINE_SYMBOLS
4517 * Figure out by how much to shift the entire Mach-O file in memory
4518 * when loading so that its single segment ends up 16-byte-aligned
4520 static int machoGetMisalignment( FILE * f )
4522 struct mach_header header;
4525 fread(&header, sizeof(header), 1, f);
4528 #if x86_64_TARGET_ARCH || powerpc64_TARGET_ARCH
4529 if(header.magic != MH_MAGIC_64)
4532 if(header.magic != MH_MAGIC)
4536 misalignment = (header.sizeofcmds + sizeof(header))
4539 return misalignment ? (16 - misalignment) : 0;