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) \
480 SymExtern(__gmpn_gcd_1) \
481 SymExtern(__gmpz_cmp) \
482 SymExtern(__gmpz_cmp_si) \
483 SymExtern(__gmpz_cmp_ui) \
484 SymExtern(__gmpz_get_si) \
485 SymExtern(__gmpz_get_ui) \
486 SymX(__int_encodeDouble) \
487 SymX(__int_encodeFloat) \
488 SymX(andIntegerzh_fast) \
489 SymX(atomicallyzh_fast) \
493 SymX(blockAsyncExceptionszh_fast) \
495 SymX(catchRetryzh_fast) \
496 SymX(catchSTMzh_fast) \
498 SymX(closure_flags) \
500 SymX(cmpIntegerzh_fast) \
501 SymX(cmpIntegerIntzh_fast) \
502 SymX(complementIntegerzh_fast) \
503 SymX(createAdjustor) \
504 SymX(decodeDoublezh_fast) \
505 SymX(decodeFloatzh_fast) \
508 SymX(deRefWeakzh_fast) \
509 SymX(deRefStablePtrzh_fast) \
510 SymX(dirty_MUT_VAR) \
511 SymX(divExactIntegerzh_fast) \
512 SymX(divModIntegerzh_fast) \
514 SymX(forkOnzh_fast) \
516 SymX(forkOS_createThread) \
517 SymX(freeHaskellFunctionPtr) \
518 SymX(freeStablePtr) \
519 SymX(getOrSetTypeableStore) \
520 SymX(gcdIntegerzh_fast) \
521 SymX(gcdIntegerIntzh_fast) \
522 SymX(gcdIntzh_fast) \
526 SymX(getFullProgArgv) \
532 SymX(hs_perform_gc) \
533 SymX(hs_free_stable_ptr) \
534 SymX(hs_free_fun_ptr) \
536 SymX(unpackClosurezh_fast) \
537 SymX(getApStackValzh_fast) \
538 SymX(int2Integerzh_fast) \
539 SymX(integer2Intzh_fast) \
540 SymX(integer2Wordzh_fast) \
541 SymX(isCurrentThreadBoundzh_fast) \
542 SymX(isDoubleDenormalized) \
543 SymX(isDoubleInfinite) \
545 SymX(isDoubleNegativeZero) \
546 SymX(isEmptyMVarzh_fast) \
547 SymX(isFloatDenormalized) \
548 SymX(isFloatInfinite) \
550 SymX(isFloatNegativeZero) \
551 SymX(killThreadzh_fast) \
553 SymX(insertStableSymbol) \
556 SymX(makeStablePtrzh_fast) \
557 SymX(minusIntegerzh_fast) \
558 SymX(mkApUpd0zh_fast) \
559 SymX(myThreadIdzh_fast) \
560 SymX(labelThreadzh_fast) \
561 SymX(newArrayzh_fast) \
562 SymX(newBCOzh_fast) \
563 SymX(newByteArrayzh_fast) \
564 SymX_redirect(newCAF, newDynCAF) \
565 SymX(newMVarzh_fast) \
566 SymX(newMutVarzh_fast) \
567 SymX(newTVarzh_fast) \
568 SymX(noDuplicatezh_fast) \
569 SymX(atomicModifyMutVarzh_fast) \
570 SymX(newPinnedByteArrayzh_fast) \
572 SymX(orIntegerzh_fast) \
574 SymX(performMajorGC) \
575 SymX(plusIntegerzh_fast) \
578 SymX(putMVarzh_fast) \
579 SymX(quotIntegerzh_fast) \
580 SymX(quotRemIntegerzh_fast) \
582 SymX(raiseIOzh_fast) \
583 SymX(readTVarzh_fast) \
584 SymX(remIntegerzh_fast) \
585 SymX(resetNonBlockingFd) \
590 SymX(rts_checkSchedStatus) \
593 SymX(rts_evalLazyIO) \
594 SymX(rts_evalStableIO) \
598 SymX(rts_getDouble) \
603 SymX(rts_getFunPtr) \
604 SymX(rts_getStablePtr) \
605 SymX(rts_getThreadId) \
607 SymX(rts_getWord32) \
620 SymX(rts_mkStablePtr) \
628 SymX(rtsSupportsBoundThreads) \
629 SymX(__hscore_get_saved_termios) \
630 SymX(__hscore_set_saved_termios) \
632 SymX(startupHaskell) \
633 SymX(shutdownHaskell) \
634 SymX(shutdownHaskellAndExit) \
635 SymX(stable_ptr_table) \
636 SymX(stackOverflow) \
637 SymX(stg_CAF_BLACKHOLE_info) \
638 SymX(awakenBlockedQueue) \
639 SymX(stg_CHARLIKE_closure) \
640 SymX(stg_EMPTY_MVAR_info) \
641 SymX(stg_IND_STATIC_info) \
642 SymX(stg_INTLIKE_closure) \
643 SymX(stg_MUT_ARR_PTRS_DIRTY_info) \
644 SymX(stg_MUT_ARR_PTRS_FROZEN_info) \
645 SymX(stg_MUT_ARR_PTRS_FROZEN0_info) \
646 SymX(stg_WEAK_info) \
647 SymX(stg_ap_v_info) \
648 SymX(stg_ap_f_info) \
649 SymX(stg_ap_d_info) \
650 SymX(stg_ap_l_info) \
651 SymX(stg_ap_n_info) \
652 SymX(stg_ap_p_info) \
653 SymX(stg_ap_pv_info) \
654 SymX(stg_ap_pp_info) \
655 SymX(stg_ap_ppv_info) \
656 SymX(stg_ap_ppp_info) \
657 SymX(stg_ap_pppv_info) \
658 SymX(stg_ap_pppp_info) \
659 SymX(stg_ap_ppppp_info) \
660 SymX(stg_ap_pppppp_info) \
661 SymX(stg_ap_0_fast) \
662 SymX(stg_ap_v_fast) \
663 SymX(stg_ap_f_fast) \
664 SymX(stg_ap_d_fast) \
665 SymX(stg_ap_l_fast) \
666 SymX(stg_ap_n_fast) \
667 SymX(stg_ap_p_fast) \
668 SymX(stg_ap_pv_fast) \
669 SymX(stg_ap_pp_fast) \
670 SymX(stg_ap_ppv_fast) \
671 SymX(stg_ap_ppp_fast) \
672 SymX(stg_ap_pppv_fast) \
673 SymX(stg_ap_pppp_fast) \
674 SymX(stg_ap_ppppp_fast) \
675 SymX(stg_ap_pppppp_fast) \
676 SymX(stg_ap_1_upd_info) \
677 SymX(stg_ap_2_upd_info) \
678 SymX(stg_ap_3_upd_info) \
679 SymX(stg_ap_4_upd_info) \
680 SymX(stg_ap_5_upd_info) \
681 SymX(stg_ap_6_upd_info) \
682 SymX(stg_ap_7_upd_info) \
684 SymX(stg_sel_0_upd_info) \
685 SymX(stg_sel_10_upd_info) \
686 SymX(stg_sel_11_upd_info) \
687 SymX(stg_sel_12_upd_info) \
688 SymX(stg_sel_13_upd_info) \
689 SymX(stg_sel_14_upd_info) \
690 SymX(stg_sel_15_upd_info) \
691 SymX(stg_sel_1_upd_info) \
692 SymX(stg_sel_2_upd_info) \
693 SymX(stg_sel_3_upd_info) \
694 SymX(stg_sel_4_upd_info) \
695 SymX(stg_sel_5_upd_info) \
696 SymX(stg_sel_6_upd_info) \
697 SymX(stg_sel_7_upd_info) \
698 SymX(stg_sel_8_upd_info) \
699 SymX(stg_sel_9_upd_info) \
700 SymX(stg_upd_frame_info) \
701 SymX(suspendThread) \
702 SymX(takeMVarzh_fast) \
703 SymX(timesIntegerzh_fast) \
704 SymX(tryPutMVarzh_fast) \
705 SymX(tryTakeMVarzh_fast) \
706 SymX(unblockAsyncExceptionszh_fast) \
708 SymX(unsafeThawArrayzh_fast) \
709 SymX(waitReadzh_fast) \
710 SymX(waitWritezh_fast) \
711 SymX(word2Integerzh_fast) \
712 SymX(writeTVarzh_fast) \
713 SymX(xorIntegerzh_fast) \
715 SymX(stg_interp_constr_entry) \
718 SymX(getAllocations) \
721 SymX(rts_breakpoint_io_action) \
722 SymX(rts_stop_next_breakpoint) \
723 SymX(rts_stop_on_exception) \
724 RTS_USER_SIGNALS_SYMBOLS
726 #ifdef SUPPORT_LONG_LONGS
727 #define RTS_LONG_LONG_SYMS \
728 SymX(int64ToIntegerzh_fast) \
729 SymX(word64ToIntegerzh_fast)
731 #define RTS_LONG_LONG_SYMS /* nothing */
734 // 64-bit support functions in libgcc.a
735 #if defined(__GNUC__) && SIZEOF_VOID_P <= 4
736 #define RTS_LIBGCC_SYMBOLS \
746 #elif defined(ia64_HOST_ARCH)
747 #define RTS_LIBGCC_SYMBOLS \
755 #define RTS_LIBGCC_SYMBOLS
758 #if defined(darwin_HOST_OS) && defined(powerpc_HOST_ARCH)
759 // Symbols that don't have a leading underscore
760 // on Mac OS X. They have to receive special treatment,
761 // see machoInitSymbolsWithoutUnderscore()
762 #define RTS_MACHO_NOUNDERLINE_SYMBOLS \
767 /* entirely bogus claims about types of these symbols */
768 #define Sym(vvv) extern void vvv(void);
769 #if defined(__PIC__) && defined(mingw32_TARGET_OS)
770 #define SymExtern(vvv) extern void _imp__ ## vvv (void);
772 #define SymExtern(vvv) SymX(vvv)
774 #define SymX(vvv) /**/
775 #define SymX_redirect(vvv,xxx) /**/
779 RTS_POSIX_ONLY_SYMBOLS
780 RTS_MINGW_ONLY_SYMBOLS
781 RTS_CYGWIN_ONLY_SYMBOLS
782 RTS_DARWIN_ONLY_SYMBOLS
789 #ifdef LEADING_UNDERSCORE
790 #define MAYBE_LEADING_UNDERSCORE_STR(s) ("_" s)
792 #define MAYBE_LEADING_UNDERSCORE_STR(s) (s)
795 #define Sym(vvv) { MAYBE_LEADING_UNDERSCORE_STR(#vvv), \
797 #define SymX(vvv) Sym(vvv)
798 #define SymExtern(vvv) { MAYBE_LEADING_UNDERSCORE_STR(#vvv), \
799 (void*)DLL_IMPORT_DATA_REF(vvv) },
801 // SymX_redirect allows us to redirect references to one symbol to
802 // another symbol. See newCAF/newDynCAF for an example.
803 #define SymX_redirect(vvv,xxx) \
804 { MAYBE_LEADING_UNDERSCORE_STR(#vvv), \
807 static RtsSymbolVal rtsSyms[] = {
811 RTS_POSIX_ONLY_SYMBOLS
812 RTS_MINGW_ONLY_SYMBOLS
813 RTS_CYGWIN_ONLY_SYMBOLS
814 RTS_DARWIN_ONLY_SYMBOLS
816 #if defined(darwin_HOST_OS) && defined(i386_HOST_ARCH)
817 // dyld stub code contains references to this,
818 // but it should never be called because we treat
819 // lazy pointers as nonlazy.
820 { "dyld_stub_binding_helper", (void*)0xDEADBEEF },
822 { 0, 0 } /* sentinel */
827 /* -----------------------------------------------------------------------------
828 * Insert symbols into hash tables, checking for duplicates.
831 static void ghciInsertStrHashTable ( char* obj_name,
837 if (lookupHashTable(table, (StgWord)key) == NULL)
839 insertStrHashTable(table, (StgWord)key, data);
844 "GHCi runtime linker: fatal error: I found a duplicate definition for symbol\n"
846 "whilst processing object file\n"
848 "This could be caused by:\n"
849 " * Loading two different object files which export the same symbol\n"
850 " * Specifying the same object file twice on the GHCi command line\n"
851 " * An incorrect `package.conf' entry, causing some object to be\n"
853 "GHCi cannot safely continue in this situation. Exiting now. Sorry.\n"
860 /* -----------------------------------------------------------------------------
861 * initialize the object linker
865 static int linker_init_done = 0 ;
867 #if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
868 static void *dl_prog_handle;
876 /* Make initLinker idempotent, so we can call it
877 before evey relevant operation; that means we
878 don't need to initialise the linker separately */
879 if (linker_init_done == 1) { return; } else {
880 linker_init_done = 1;
883 stablehash = allocStrHashTable();
884 symhash = allocStrHashTable();
886 /* populate the symbol table with stuff from the RTS */
887 for (sym = rtsSyms; sym->lbl != NULL; sym++) {
888 ghciInsertStrHashTable("(GHCi built-in symbols)",
889 symhash, sym->lbl, sym->addr);
891 # if defined(OBJFORMAT_MACHO) && defined(powerpc_HOST_ARCH)
892 machoInitSymbolsWithoutUnderscore();
895 # if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
896 # if defined(RTLD_DEFAULT)
897 dl_prog_handle = RTLD_DEFAULT;
899 dl_prog_handle = dlopen(NULL, RTLD_LAZY);
900 # endif /* RTLD_DEFAULT */
904 /* -----------------------------------------------------------------------------
905 * Loading DLL or .so dynamic libraries
906 * -----------------------------------------------------------------------------
908 * Add a DLL from which symbols may be found. In the ELF case, just
909 * do RTLD_GLOBAL-style add, so no further messing around needs to
910 * happen in order that symbols in the loaded .so are findable --
911 * lookupSymbol() will subsequently see them by dlsym on the program's
912 * dl-handle. Returns NULL if success, otherwise ptr to an err msg.
914 * In the PEi386 case, open the DLLs and put handles to them in a
915 * linked list. When looking for a symbol, try all handles in the
916 * list. This means that we need to load even DLLs that are guaranteed
917 * to be in the ghc.exe image already, just so we can get a handle
918 * to give to loadSymbol, so that we can find the symbols. For such
919 * libraries, the LoadLibrary call should be a no-op except for returning
924 #if defined(OBJFORMAT_PEi386)
925 /* A record for storing handles into DLLs. */
930 struct _OpenedDLL* next;
935 /* A list thereof. */
936 static OpenedDLL* opened_dlls = NULL;
940 addDLL( char *dll_name )
942 # if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
943 /* ------------------- ELF DLL loader ------------------- */
949 hdl= dlopen(dll_name, RTLD_NOW | RTLD_GLOBAL);
952 /* dlopen failed; return a ptr to the error msg. */
954 if (errmsg == NULL) errmsg = "addDLL: unknown error";
961 # elif defined(OBJFORMAT_PEi386)
962 /* ------------------- Win32 DLL loader ------------------- */
970 /* debugBelch("\naddDLL; dll_name = `%s'\n", dll_name); */
972 /* See if we've already got it, and ignore if so. */
973 for (o_dll = opened_dlls; o_dll != NULL; o_dll = o_dll->next) {
974 if (0 == strcmp(o_dll->name, dll_name))
978 /* The file name has no suffix (yet) so that we can try
979 both foo.dll and foo.drv
981 The documentation for LoadLibrary says:
982 If no file name extension is specified in the lpFileName
983 parameter, the default library extension .dll is
984 appended. However, the file name string can include a trailing
985 point character (.) to indicate that the module name has no
988 buf = stgMallocBytes(strlen(dll_name) + 10, "addDLL");
989 sprintf(buf, "%s.DLL", dll_name);
990 instance = LoadLibrary(buf);
991 if (instance == NULL) {
992 sprintf(buf, "%s.DRV", dll_name); // KAA: allow loading of drivers (like winspool.drv)
993 instance = LoadLibrary(buf);
994 if (instance == NULL) {
997 /* LoadLibrary failed; return a ptr to the error msg. */
998 return "addDLL: unknown error";
1003 /* Add this DLL to the list of DLLs in which to search for symbols. */
1004 o_dll = stgMallocBytes( sizeof(OpenedDLL), "addDLL" );
1005 o_dll->name = stgMallocBytes(1+strlen(dll_name), "addDLL");
1006 strcpy(o_dll->name, dll_name);
1007 o_dll->instance = instance;
1008 o_dll->next = opened_dlls;
1009 opened_dlls = o_dll;
1013 barf("addDLL: not implemented on this platform");
1017 /* -----------------------------------------------------------------------------
1018 * insert a stable symbol in the hash table
1022 insertStableSymbol(char* obj_name, char* key, StgPtr p)
1024 ghciInsertStrHashTable(obj_name, stablehash, key, getStablePtr(p));
1028 /* -----------------------------------------------------------------------------
1029 * insert a symbol in the hash table
1032 insertSymbol(char* obj_name, char* key, void* data)
1034 ghciInsertStrHashTable(obj_name, symhash, key, data);
1037 /* -----------------------------------------------------------------------------
1038 * lookup a symbol in the hash table
1041 lookupSymbol( char *lbl )
1045 ASSERT(symhash != NULL);
1046 val = lookupStrHashTable(symhash, lbl);
1049 # if defined(OBJFORMAT_ELF)
1050 # if defined(x86_64_HOST_ARCH)
1051 val = dlsym(dl_prog_handle, lbl);
1052 if (val >= (void *)0x80000000) {
1054 new_val = x86_64_high_symbol(lbl, val);
1055 IF_DEBUG(linker,debugBelch("lookupSymbol: relocating out of range symbol: %s = %p, now %p\n", lbl, val, new_val));
1061 return dlsym(dl_prog_handle, lbl);
1063 # elif defined(OBJFORMAT_MACHO)
1064 if(NSIsSymbolNameDefined(lbl)) {
1065 NSSymbol symbol = NSLookupAndBindSymbol(lbl);
1066 return NSAddressOfSymbol(symbol);
1070 # elif defined(OBJFORMAT_PEi386)
1073 for (o_dll = opened_dlls; o_dll != NULL; o_dll = o_dll->next) {
1074 /* debugBelch("look in %s for %s\n", o_dll->name, lbl); */
1075 if (lbl[0] == '_') {
1076 /* HACK: if the name has an initial underscore, try stripping
1077 it off & look that up first. I've yet to verify whether there's
1078 a Rule that governs whether an initial '_' *should always* be
1079 stripped off when mapping from import lib name to the DLL name.
1081 sym = GetProcAddress(o_dll->instance, (lbl+1));
1083 /*debugBelch("found %s in %s\n", lbl+1,o_dll->name);*/
1087 sym = GetProcAddress(o_dll->instance, lbl);
1089 /*debugBelch("found %s in %s\n", lbl,o_dll->name);*/
1104 __attribute((unused))
1106 lookupLocalSymbol( ObjectCode* oc, char *lbl )
1110 val = lookupStrHashTable(oc->lochash, lbl);
1120 /* -----------------------------------------------------------------------------
1121 * Debugging aid: look in GHCi's object symbol tables for symbols
1122 * within DELTA bytes of the specified address, and show their names.
1125 void ghci_enquire ( char* addr );
1127 void ghci_enquire ( char* addr )
1132 const int DELTA = 64;
1137 for (oc = objects; oc; oc = oc->next) {
1138 for (i = 0; i < oc->n_symbols; i++) {
1139 sym = oc->symbols[i];
1140 if (sym == NULL) continue;
1141 // debugBelch("enquire %p %p\n", sym, oc->lochash);
1143 if (oc->lochash != NULL) {
1144 a = lookupStrHashTable(oc->lochash, sym);
1147 a = lookupStrHashTable(symhash, sym);
1150 // debugBelch("ghci_enquire: can't find %s\n", sym);
1152 else if (addr-DELTA <= a && a <= addr+DELTA) {
1153 debugBelch("%p + %3d == `%s'\n", addr, (int)(a - addr), sym);
1160 #ifdef ia64_HOST_ARCH
1161 static unsigned int PLTSize(void);
1164 /* -----------------------------------------------------------------------------
1165 * Load an obj (populate the global symbol table, but don't resolve yet)
1167 * Returns: 1 if ok, 0 on error.
1170 loadObj( char *path )
1177 void *map_addr = NULL;
1183 /* debugBelch("loadObj %s\n", path ); */
1185 /* Check that we haven't already loaded this object.
1186 Ignore requests to load multiple times */
1190 for (o = objects; o; o = o->next) {
1191 if (0 == strcmp(o->fileName, path)) {
1193 break; /* don't need to search further */
1197 IF_DEBUG(linker, debugBelch(
1198 "GHCi runtime linker: warning: looks like you're trying to load the\n"
1199 "same object file twice:\n"
1201 "GHCi will ignore this, but be warned.\n"
1203 return 1; /* success */
1207 oc = stgMallocBytes(sizeof(ObjectCode), "loadObj(oc)");
1209 # if defined(OBJFORMAT_ELF)
1210 oc->formatName = "ELF";
1211 # elif defined(OBJFORMAT_PEi386)
1212 oc->formatName = "PEi386";
1213 # elif defined(OBJFORMAT_MACHO)
1214 oc->formatName = "Mach-O";
1217 barf("loadObj: not implemented on this platform");
1220 r = stat(path, &st);
1221 if (r == -1) { return 0; }
1223 /* sigh, strdup() isn't a POSIX function, so do it the long way */
1224 oc->fileName = stgMallocBytes( strlen(path)+1, "loadObj" );
1225 strcpy(oc->fileName, path);
1227 oc->fileSize = st.st_size;
1229 oc->sections = NULL;
1230 oc->lochash = allocStrHashTable();
1231 oc->proddables = NULL;
1233 /* chain it onto the list of objects */
1238 #define ROUND_UP(x,size) ((x + size - 1) & ~(size - 1))
1240 /* On many architectures malloc'd memory isn't executable, so we need to use mmap. */
1242 #if defined(openbsd_HOST_OS)
1243 fd = open(path, O_RDONLY, S_IRUSR);
1245 fd = open(path, O_RDONLY);
1248 barf("loadObj: can't open `%s'", path);
1250 pagesize = getpagesize();
1252 #ifdef ia64_HOST_ARCH
1253 /* The PLT needs to be right before the object */
1254 n = ROUND_UP(PLTSize(), pagesize);
1255 oc->plt = mmap(NULL, n, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
1256 if (oc->plt == MAP_FAILED)
1257 barf("loadObj: can't allocate PLT");
1260 map_addr = oc->plt + n;
1263 n = ROUND_UP(oc->fileSize, pagesize);
1265 /* Link objects into the lower 2Gb on x86_64. GHC assumes the
1266 * small memory model on this architecture (see gcc docs,
1269 #ifdef x86_64_HOST_ARCH
1270 #define EXTRA_MAP_FLAGS MAP_32BIT
1272 #define EXTRA_MAP_FLAGS 0
1275 oc->image = mmap(map_addr, n, PROT_EXEC|PROT_READ|PROT_WRITE,
1276 MAP_PRIVATE|EXTRA_MAP_FLAGS, fd, 0);
1277 if (oc->image == MAP_FAILED)
1278 barf("loadObj: can't map `%s'", path);
1282 #else /* !USE_MMAP */
1284 /* load the image into memory */
1285 f = fopen(path, "rb");
1287 barf("loadObj: can't read `%s'", path);
1289 # if defined(mingw32_HOST_OS)
1290 // TODO: We would like to use allocateExec here, but allocateExec
1291 // cannot currently allocate blocks large enough.
1292 oc->image = VirtualAlloc(NULL, oc->fileSize, MEM_RESERVE | MEM_COMMIT,
1293 PAGE_EXECUTE_READWRITE);
1294 # elif defined(darwin_HOST_OS)
1295 // In a Mach-O .o file, all sections can and will be misaligned
1296 // if the total size of the headers is not a multiple of the
1297 // desired alignment. This is fine for .o files that only serve
1298 // as input for the static linker, but it's not fine for us,
1299 // as SSE (used by gcc for floating point) and Altivec require
1300 // 16-byte alignment.
1301 // We calculate the correct alignment from the header before
1302 // reading the file, and then we misalign oc->image on purpose so
1303 // that the actual sections end up aligned again.
1304 oc->misalignment = machoGetMisalignment(f);
1305 oc->image = stgMallocBytes(oc->fileSize + oc->misalignment, "loadObj(image)");
1306 oc->image += oc->misalignment;
1308 oc->image = stgMallocBytes(oc->fileSize, "loadObj(image)");
1311 n = fread ( oc->image, 1, oc->fileSize, f );
1312 if (n != oc->fileSize)
1313 barf("loadObj: error whilst reading `%s'", path);
1316 #endif /* USE_MMAP */
1318 # if defined(OBJFORMAT_MACHO) && (defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH))
1319 r = ocAllocateSymbolExtras_MachO ( oc );
1320 if (!r) { return r; }
1321 # elif defined(OBJFORMAT_ELF) && defined(powerpc_HOST_ARCH)
1322 r = ocAllocateSymbolExtras_ELF ( oc );
1323 if (!r) { return r; }
1326 /* verify the in-memory image */
1327 # if defined(OBJFORMAT_ELF)
1328 r = ocVerifyImage_ELF ( oc );
1329 # elif defined(OBJFORMAT_PEi386)
1330 r = ocVerifyImage_PEi386 ( oc );
1331 # elif defined(OBJFORMAT_MACHO)
1332 r = ocVerifyImage_MachO ( oc );
1334 barf("loadObj: no verify method");
1336 if (!r) { return r; }
1338 /* build the symbol list for this image */
1339 # if defined(OBJFORMAT_ELF)
1340 r = ocGetNames_ELF ( oc );
1341 # elif defined(OBJFORMAT_PEi386)
1342 r = ocGetNames_PEi386 ( oc );
1343 # elif defined(OBJFORMAT_MACHO)
1344 r = ocGetNames_MachO ( oc );
1346 barf("loadObj: no getNames method");
1348 if (!r) { return r; }
1350 /* loaded, but not resolved yet */
1351 oc->status = OBJECT_LOADED;
1356 /* -----------------------------------------------------------------------------
1357 * resolve all the currently unlinked objects in memory
1359 * Returns: 1 if ok, 0 on error.
1369 for (oc = objects; oc; oc = oc->next) {
1370 if (oc->status != OBJECT_RESOLVED) {
1371 # if defined(OBJFORMAT_ELF)
1372 r = ocResolve_ELF ( oc );
1373 # elif defined(OBJFORMAT_PEi386)
1374 r = ocResolve_PEi386 ( oc );
1375 # elif defined(OBJFORMAT_MACHO)
1376 r = ocResolve_MachO ( oc );
1378 barf("resolveObjs: not implemented on this platform");
1380 if (!r) { return r; }
1381 oc->status = OBJECT_RESOLVED;
1387 /* -----------------------------------------------------------------------------
1388 * delete an object from the pool
1391 unloadObj( char *path )
1393 ObjectCode *oc, *prev;
1395 ASSERT(symhash != NULL);
1396 ASSERT(objects != NULL);
1401 for (oc = objects; oc; prev = oc, oc = oc->next) {
1402 if (!strcmp(oc->fileName,path)) {
1404 /* Remove all the mappings for the symbols within this
1409 for (i = 0; i < oc->n_symbols; i++) {
1410 if (oc->symbols[i] != NULL) {
1411 removeStrHashTable(symhash, oc->symbols[i], NULL);
1419 prev->next = oc->next;
1422 // We're going to leave this in place, in case there are
1423 // any pointers from the heap into it:
1424 // #ifdef mingw32_HOST_OS
1425 // VirtualFree(oc->image);
1427 // stgFree(oc->image);
1429 stgFree(oc->fileName);
1430 stgFree(oc->symbols);
1431 stgFree(oc->sections);
1432 /* The local hash table should have been freed at the end
1433 of the ocResolve_ call on it. */
1434 ASSERT(oc->lochash == NULL);
1440 errorBelch("unloadObj: can't find `%s' to unload", path);
1444 /* -----------------------------------------------------------------------------
1445 * Sanity checking. For each ObjectCode, maintain a list of address ranges
1446 * which may be prodded during relocation, and abort if we try and write
1447 * outside any of these.
1449 static void addProddableBlock ( ObjectCode* oc, void* start, int size )
1452 = stgMallocBytes(sizeof(ProddableBlock), "addProddableBlock");
1453 /* debugBelch("aPB %p %p %d\n", oc, start, size); */
1457 pb->next = oc->proddables;
1458 oc->proddables = pb;
1461 static void checkProddableBlock ( ObjectCode* oc, void* addr )
1464 for (pb = oc->proddables; pb != NULL; pb = pb->next) {
1465 char* s = (char*)(pb->start);
1466 char* e = s + pb->size - 1;
1467 char* a = (char*)addr;
1468 /* Assumes that the biggest fixup involves a 4-byte write. This
1469 probably needs to be changed to 8 (ie, +7) on 64-bit
1471 if (a >= s && (a+3) <= e) return;
1473 barf("checkProddableBlock: invalid fixup in runtime linker");
1476 /* -----------------------------------------------------------------------------
1477 * Section management.
1479 static void addSection ( ObjectCode* oc, SectionKind kind,
1480 void* start, void* end )
1482 Section* s = stgMallocBytes(sizeof(Section), "addSection");
1486 s->next = oc->sections;
1489 debugBelch("addSection: %p-%p (size %d), kind %d\n",
1490 start, ((char*)end)-1, end - start + 1, kind );
1495 /* --------------------------------------------------------------------------
1497 * This is about allocating a small chunk of memory for every symbol in the
1498 * object file. We make sure that the SymboLExtras are always "in range" of
1499 * limited-range PC-relative instructions on various platforms by allocating
1500 * them right next to the object code itself.
1503 #if defined(powerpc_HOST_ARCH) || (defined(x86_64_HOST_ARCH) \
1504 && defined(darwin_TARGET_OS))
1507 ocAllocateSymbolExtras
1509 Allocate additional space at the end of the object file image to make room
1510 for jump islands (powerpc, x86_64) and GOT entries (x86_64).
1512 PowerPC relative branch instructions have a 24 bit displacement field.
1513 As PPC code is always 4-byte-aligned, this yields a +-32MB range.
1514 If a particular imported symbol is outside this range, we have to redirect
1515 the jump to a short piece of new code that just loads the 32bit absolute
1516 address and jumps there.
1517 On x86_64, PC-relative jumps and PC-relative accesses to the GOT are limited
1520 This function just allocates space for one SymbolExtra for every
1521 undefined symbol in the object file. The code for the jump islands is
1522 filled in by makeSymbolExtra below.
1525 static int ocAllocateSymbolExtras( ObjectCode* oc, int count, int first )
1531 int misalignment = 0;
1533 misalignment = oc->misalignment;
1538 // round up to the nearest 4
1539 aligned = (oc->fileSize + 3) & ~3;
1542 #ifndef linux_HOST_OS /* mremap is a linux extension */
1543 #error ocAllocateSymbolExtras doesnt want USE_MMAP to be defined
1546 pagesize = getpagesize();
1547 n = ROUND_UP( oc->fileSize, pagesize );
1548 m = ROUND_UP( aligned + sizeof (SymbolExtra) * count, pagesize );
1550 /* If we have a half-page-size file and map one page of it then
1551 * the part of the page after the size of the file remains accessible.
1552 * If, however, we map in 2 pages, the 2nd page is not accessible
1553 * and will give a "Bus Error" on access. To get around this, we check
1554 * if we need any extra pages for the jump islands and map them in
1555 * anonymously. We must check that we actually require extra pages
1556 * otherwise the attempt to mmap 0 pages of anonymous memory will
1562 /* The effect of this mremap() call is only the ensure that we have
1563 * a sufficient number of virtually contiguous pages. As returned from
1564 * mremap, the pages past the end of the file are not backed. We give
1565 * them a backing by using MAP_FIXED to map in anonymous pages.
1567 oc->image = mremap( oc->image, n, m, MREMAP_MAYMOVE );
1569 if( oc->image == MAP_FAILED )
1571 errorBelch( "Unable to mremap for Jump Islands\n" );
1575 if( mmap( oc->image + n, m - n, PROT_READ | PROT_WRITE | PROT_EXEC,
1576 MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED, 0, 0 ) == MAP_FAILED )
1578 errorBelch( "Unable to mmap( MAP_FIXED ) for Jump Islands\n" );
1584 oc->image -= misalignment;
1585 oc->image = stgReallocBytes( oc->image,
1587 aligned + sizeof (SymbolExtra) * count,
1588 "ocAllocateSymbolExtras" );
1589 oc->image += misalignment;
1590 #endif /* USE_MMAP */
1592 oc->symbol_extras = (SymbolExtra *) (oc->image + aligned);
1593 memset( oc->symbol_extras, 0, sizeof (SymbolExtra) * count );
1596 oc->symbol_extras = NULL;
1598 oc->first_symbol_extra = first;
1599 oc->n_symbol_extras = count;
1604 static SymbolExtra* makeSymbolExtra( ObjectCode* oc,
1605 unsigned long symbolNumber,
1606 unsigned long target )
1610 ASSERT( symbolNumber >= oc->first_symbol_extra
1611 && symbolNumber - oc->first_symbol_extra < oc->n_symbol_extras);
1613 extra = &oc->symbol_extras[symbolNumber - oc->first_symbol_extra];
1615 #ifdef powerpc_HOST_ARCH
1616 // lis r12, hi16(target)
1617 extra->jumpIsland.lis_r12 = 0x3d80;
1618 extra->jumpIsland.hi_addr = target >> 16;
1620 // ori r12, r12, lo16(target)
1621 extra->jumpIsland.ori_r12_r12 = 0x618c;
1622 extra->jumpIsland.lo_addr = target & 0xffff;
1625 extra->jumpIsland.mtctr_r12 = 0x7d8903a6;
1628 extra->jumpIsland.bctr = 0x4e800420;
1630 #ifdef x86_64_HOST_ARCH
1632 static uint8_t jmp[] = { 0xFF, 0x25, 0xF2, 0xFF, 0xFF, 0xFF };
1633 extra->addr = target;
1634 memcpy(extra->jumpIsland, jmp, 6);
1642 /* --------------------------------------------------------------------------
1643 * PowerPC specifics (instruction cache flushing)
1644 * ------------------------------------------------------------------------*/
1646 #ifdef powerpc_TARGET_ARCH
1648 ocFlushInstructionCache
1650 Flush the data & instruction caches.
1651 Because the PPC has split data/instruction caches, we have to
1652 do that whenever we modify code at runtime.
1655 static void ocFlushInstructionCache( ObjectCode *oc )
1657 int n = (oc->fileSize + sizeof( SymbolExtra ) * oc->n_symbol_extras + 3) / 4;
1658 unsigned long *p = (unsigned long *) oc->image;
1662 __asm__ volatile ( "dcbf 0,%0\n\t"
1670 __asm__ volatile ( "sync\n\t"
1676 /* --------------------------------------------------------------------------
1677 * PEi386 specifics (Win32 targets)
1678 * ------------------------------------------------------------------------*/
1680 /* The information for this linker comes from
1681 Microsoft Portable Executable
1682 and Common Object File Format Specification
1683 revision 5.1 January 1998
1684 which SimonM says comes from the MS Developer Network CDs.
1686 It can be found there (on older CDs), but can also be found
1689 http://www.microsoft.com/hwdev/hardware/PECOFF.asp
1691 (this is Rev 6.0 from February 1999).
1693 Things move, so if that fails, try searching for it via
1695 http://www.google.com/search?q=PE+COFF+specification
1697 The ultimate reference for the PE format is the Winnt.h
1698 header file that comes with the Platform SDKs; as always,
1699 implementations will drift wrt their documentation.
1701 A good background article on the PE format is Matt Pietrek's
1702 March 1994 article in Microsoft System Journal (MSJ)
1703 (Vol.9, No. 3): "Peering Inside the PE: A Tour of the
1704 Win32 Portable Executable File Format." The info in there
1705 has recently been updated in a two part article in
1706 MSDN magazine, issues Feb and March 2002,
1707 "Inside Windows: An In-Depth Look into the Win32 Portable
1708 Executable File Format"
1710 John Levine's book "Linkers and Loaders" contains useful
1715 #if defined(OBJFORMAT_PEi386)
1719 typedef unsigned char UChar;
1720 typedef unsigned short UInt16;
1721 typedef unsigned int UInt32;
1728 UInt16 NumberOfSections;
1729 UInt32 TimeDateStamp;
1730 UInt32 PointerToSymbolTable;
1731 UInt32 NumberOfSymbols;
1732 UInt16 SizeOfOptionalHeader;
1733 UInt16 Characteristics;
1737 #define sizeof_COFF_header 20
1744 UInt32 VirtualAddress;
1745 UInt32 SizeOfRawData;
1746 UInt32 PointerToRawData;
1747 UInt32 PointerToRelocations;
1748 UInt32 PointerToLinenumbers;
1749 UInt16 NumberOfRelocations;
1750 UInt16 NumberOfLineNumbers;
1751 UInt32 Characteristics;
1755 #define sizeof_COFF_section 40
1762 UInt16 SectionNumber;
1765 UChar NumberOfAuxSymbols;
1769 #define sizeof_COFF_symbol 18
1774 UInt32 VirtualAddress;
1775 UInt32 SymbolTableIndex;
1780 #define sizeof_COFF_reloc 10
1783 /* From PE spec doc, section 3.3.2 */
1784 /* Note use of MYIMAGE_* since IMAGE_* are already defined in
1785 windows.h -- for the same purpose, but I want to know what I'm
1787 #define MYIMAGE_FILE_RELOCS_STRIPPED 0x0001
1788 #define MYIMAGE_FILE_EXECUTABLE_IMAGE 0x0002
1789 #define MYIMAGE_FILE_DLL 0x2000
1790 #define MYIMAGE_FILE_SYSTEM 0x1000
1791 #define MYIMAGE_FILE_BYTES_REVERSED_HI 0x8000
1792 #define MYIMAGE_FILE_BYTES_REVERSED_LO 0x0080
1793 #define MYIMAGE_FILE_32BIT_MACHINE 0x0100
1795 /* From PE spec doc, section 5.4.2 and 5.4.4 */
1796 #define MYIMAGE_SYM_CLASS_EXTERNAL 2
1797 #define MYIMAGE_SYM_CLASS_STATIC 3
1798 #define MYIMAGE_SYM_UNDEFINED 0
1800 /* From PE spec doc, section 4.1 */
1801 #define MYIMAGE_SCN_CNT_CODE 0x00000020
1802 #define MYIMAGE_SCN_CNT_INITIALIZED_DATA 0x00000040
1803 #define MYIMAGE_SCN_LNK_NRELOC_OVFL 0x01000000
1805 /* From PE spec doc, section 5.2.1 */
1806 #define MYIMAGE_REL_I386_DIR32 0x0006
1807 #define MYIMAGE_REL_I386_REL32 0x0014
1810 /* We use myindex to calculate array addresses, rather than
1811 simply doing the normal subscript thing. That's because
1812 some of the above structs have sizes which are not
1813 a whole number of words. GCC rounds their sizes up to a
1814 whole number of words, which means that the address calcs
1815 arising from using normal C indexing or pointer arithmetic
1816 are just plain wrong. Sigh.
1819 myindex ( int scale, void* base, int index )
1822 ((UChar*)base) + scale * index;
1827 printName ( UChar* name, UChar* strtab )
1829 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
1830 UInt32 strtab_offset = * (UInt32*)(name+4);
1831 debugBelch("%s", strtab + strtab_offset );
1834 for (i = 0; i < 8; i++) {
1835 if (name[i] == 0) break;
1836 debugBelch("%c", name[i] );
1843 copyName ( UChar* name, UChar* strtab, UChar* dst, int dstSize )
1845 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
1846 UInt32 strtab_offset = * (UInt32*)(name+4);
1847 strncpy ( dst, strtab+strtab_offset, dstSize );
1853 if (name[i] == 0) break;
1863 cstring_from_COFF_symbol_name ( UChar* name, UChar* strtab )
1866 /* If the string is longer than 8 bytes, look in the
1867 string table for it -- this will be correctly zero terminated.
1869 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
1870 UInt32 strtab_offset = * (UInt32*)(name+4);
1871 return ((UChar*)strtab) + strtab_offset;
1873 /* Otherwise, if shorter than 8 bytes, return the original,
1874 which by defn is correctly terminated.
1876 if (name[7]==0) return name;
1877 /* The annoying case: 8 bytes. Copy into a temporary
1878 (which is never freed ...)
1880 newstr = stgMallocBytes(9, "cstring_from_COFF_symbol_name");
1882 strncpy(newstr,name,8);
1888 /* Just compares the short names (first 8 chars) */
1889 static COFF_section *
1890 findPEi386SectionCalled ( ObjectCode* oc, char* name )
1894 = (COFF_header*)(oc->image);
1895 COFF_section* sectab
1897 ((UChar*)(oc->image))
1898 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
1900 for (i = 0; i < hdr->NumberOfSections; i++) {
1903 COFF_section* section_i
1905 myindex ( sizeof_COFF_section, sectab, i );
1906 n1 = (UChar*) &(section_i->Name);
1908 if (n1[0]==n2[0] && n1[1]==n2[1] && n1[2]==n2[2] &&
1909 n1[3]==n2[3] && n1[4]==n2[4] && n1[5]==n2[5] &&
1910 n1[6]==n2[6] && n1[7]==n2[7])
1919 zapTrailingAtSign ( UChar* sym )
1921 # define my_isdigit(c) ((c) >= '0' && (c) <= '9')
1923 if (sym[0] == 0) return;
1925 while (sym[i] != 0) i++;
1928 while (j > 0 && my_isdigit(sym[j])) j--;
1929 if (j > 0 && sym[j] == '@' && j != i) sym[j] = 0;
1935 ocVerifyImage_PEi386 ( ObjectCode* oc )
1940 COFF_section* sectab;
1941 COFF_symbol* symtab;
1943 /* debugBelch("\nLOADING %s\n", oc->fileName); */
1944 hdr = (COFF_header*)(oc->image);
1945 sectab = (COFF_section*) (
1946 ((UChar*)(oc->image))
1947 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
1949 symtab = (COFF_symbol*) (
1950 ((UChar*)(oc->image))
1951 + hdr->PointerToSymbolTable
1953 strtab = ((UChar*)symtab)
1954 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
1956 if (hdr->Machine != 0x14c) {
1957 errorBelch("%s: Not x86 PEi386", oc->fileName);
1960 if (hdr->SizeOfOptionalHeader != 0) {
1961 errorBelch("%s: PEi386 with nonempty optional header", oc->fileName);
1964 if ( /* (hdr->Characteristics & MYIMAGE_FILE_RELOCS_STRIPPED) || */
1965 (hdr->Characteristics & MYIMAGE_FILE_EXECUTABLE_IMAGE) ||
1966 (hdr->Characteristics & MYIMAGE_FILE_DLL) ||
1967 (hdr->Characteristics & MYIMAGE_FILE_SYSTEM) ) {
1968 errorBelch("%s: Not a PEi386 object file", oc->fileName);
1971 if ( (hdr->Characteristics & MYIMAGE_FILE_BYTES_REVERSED_HI)
1972 /* || !(hdr->Characteristics & MYIMAGE_FILE_32BIT_MACHINE) */ ) {
1973 errorBelch("%s: Invalid PEi386 word size or endiannness: %d",
1975 (int)(hdr->Characteristics));
1978 /* If the string table size is way crazy, this might indicate that
1979 there are more than 64k relocations, despite claims to the
1980 contrary. Hence this test. */
1981 /* debugBelch("strtab size %d\n", * (UInt32*)strtab); */
1983 if ( (*(UInt32*)strtab) > 600000 ) {
1984 /* Note that 600k has no special significance other than being
1985 big enough to handle the almost-2MB-sized lumps that
1986 constitute HSwin32*.o. */
1987 debugBelch("PEi386 object has suspiciously large string table; > 64k relocs?");
1992 /* No further verification after this point; only debug printing. */
1994 IF_DEBUG(linker, i=1);
1995 if (i == 0) return 1;
1997 debugBelch( "sectab offset = %d\n", ((UChar*)sectab) - ((UChar*)hdr) );
1998 debugBelch( "symtab offset = %d\n", ((UChar*)symtab) - ((UChar*)hdr) );
1999 debugBelch( "strtab offset = %d\n", ((UChar*)strtab) - ((UChar*)hdr) );
2002 debugBelch( "Machine: 0x%x\n", (UInt32)(hdr->Machine) );
2003 debugBelch( "# sections: %d\n", (UInt32)(hdr->NumberOfSections) );
2004 debugBelch( "time/date: 0x%x\n", (UInt32)(hdr->TimeDateStamp) );
2005 debugBelch( "symtab offset: %d\n", (UInt32)(hdr->PointerToSymbolTable) );
2006 debugBelch( "# symbols: %d\n", (UInt32)(hdr->NumberOfSymbols) );
2007 debugBelch( "sz of opt hdr: %d\n", (UInt32)(hdr->SizeOfOptionalHeader) );
2008 debugBelch( "characteristics: 0x%x\n", (UInt32)(hdr->Characteristics) );
2010 /* Print the section table. */
2012 for (i = 0; i < hdr->NumberOfSections; i++) {
2014 COFF_section* sectab_i
2016 myindex ( sizeof_COFF_section, sectab, i );
2023 printName ( sectab_i->Name, strtab );
2033 sectab_i->VirtualSize,
2034 sectab_i->VirtualAddress,
2035 sectab_i->SizeOfRawData,
2036 sectab_i->PointerToRawData,
2037 sectab_i->NumberOfRelocations,
2038 sectab_i->PointerToRelocations,
2039 sectab_i->PointerToRawData
2041 reltab = (COFF_reloc*) (
2042 ((UChar*)(oc->image)) + sectab_i->PointerToRelocations
2045 if ( sectab_i->Characteristics & MYIMAGE_SCN_LNK_NRELOC_OVFL ) {
2046 /* If the relocation field (a short) has overflowed, the
2047 * real count can be found in the first reloc entry.
2049 * See Section 4.1 (last para) of the PE spec (rev6.0).
2051 COFF_reloc* rel = (COFF_reloc*)
2052 myindex ( sizeof_COFF_reloc, reltab, 0 );
2053 noRelocs = rel->VirtualAddress;
2056 noRelocs = sectab_i->NumberOfRelocations;
2060 for (; j < noRelocs; j++) {
2062 COFF_reloc* rel = (COFF_reloc*)
2063 myindex ( sizeof_COFF_reloc, reltab, j );
2065 " type 0x%-4x vaddr 0x%-8x name `",
2067 rel->VirtualAddress );
2068 sym = (COFF_symbol*)
2069 myindex ( sizeof_COFF_symbol, symtab, rel->SymbolTableIndex );
2070 /* Hmm..mysterious looking offset - what's it for? SOF */
2071 printName ( sym->Name, strtab -10 );
2078 debugBelch("string table has size 0x%x\n", * (UInt32*)strtab );
2079 debugBelch("---START of string table---\n");
2080 for (i = 4; i < *(Int32*)strtab; i++) {
2082 debugBelch("\n"); else
2083 debugBelch("%c", strtab[i] );
2085 debugBelch("--- END of string table---\n");
2090 COFF_symbol* symtab_i;
2091 if (i >= (Int32)(hdr->NumberOfSymbols)) break;
2092 symtab_i = (COFF_symbol*)
2093 myindex ( sizeof_COFF_symbol, symtab, i );
2099 printName ( symtab_i->Name, strtab );
2108 (Int32)(symtab_i->SectionNumber),
2109 (UInt32)symtab_i->Type,
2110 (UInt32)symtab_i->StorageClass,
2111 (UInt32)symtab_i->NumberOfAuxSymbols
2113 i += symtab_i->NumberOfAuxSymbols;
2123 ocGetNames_PEi386 ( ObjectCode* oc )
2126 COFF_section* sectab;
2127 COFF_symbol* symtab;
2134 hdr = (COFF_header*)(oc->image);
2135 sectab = (COFF_section*) (
2136 ((UChar*)(oc->image))
2137 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2139 symtab = (COFF_symbol*) (
2140 ((UChar*)(oc->image))
2141 + hdr->PointerToSymbolTable
2143 strtab = ((UChar*)(oc->image))
2144 + hdr->PointerToSymbolTable
2145 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
2147 /* Allocate space for any (local, anonymous) .bss sections. */
2149 for (i = 0; i < hdr->NumberOfSections; i++) {
2152 COFF_section* sectab_i
2154 myindex ( sizeof_COFF_section, sectab, i );
2155 if (0 != strcmp(sectab_i->Name, ".bss")) continue;
2156 /* sof 10/05: the PE spec text isn't too clear regarding what
2157 * the SizeOfRawData field is supposed to hold for object
2158 * file sections containing just uninitialized data -- for executables,
2159 * it is supposed to be zero; unclear what it's supposed to be
2160 * for object files. However, VirtualSize is guaranteed to be
2161 * zero for object files, which definitely suggests that SizeOfRawData
2162 * will be non-zero (where else would the size of this .bss section be
2163 * stored?) Looking at the COFF_section info for incoming object files,
2164 * this certainly appears to be the case.
2166 * => I suspect we've been incorrectly handling .bss sections in (relocatable)
2167 * object files up until now. This turned out to bite us with ghc-6.4.1's use
2168 * of gcc-3.4.x, which has started to emit initially-zeroed-out local 'static'
2169 * variable decls into to the .bss section. (The specific function in Q which
2170 * triggered this is libraries/base/cbits/dirUtils.c:__hscore_getFolderPath())
2172 if (sectab_i->VirtualSize == 0 && sectab_i->SizeOfRawData == 0) continue;
2173 /* This is a non-empty .bss section. Allocate zeroed space for
2174 it, and set its PointerToRawData field such that oc->image +
2175 PointerToRawData == addr_of_zeroed_space. */
2176 bss_sz = sectab_i->VirtualSize;
2177 if ( bss_sz < sectab_i->SizeOfRawData) { bss_sz = sectab_i->SizeOfRawData; }
2178 zspace = stgCallocBytes(1, bss_sz, "ocGetNames_PEi386(anonymous bss)");
2179 sectab_i->PointerToRawData = ((UChar*)zspace) - ((UChar*)(oc->image));
2180 addProddableBlock(oc, zspace, bss_sz);
2181 /* debugBelch("BSS anon section at 0x%x\n", zspace); */
2184 /* Copy section information into the ObjectCode. */
2186 for (i = 0; i < hdr->NumberOfSections; i++) {
2192 = SECTIONKIND_OTHER;
2193 COFF_section* sectab_i
2195 myindex ( sizeof_COFF_section, sectab, i );
2196 IF_DEBUG(linker, debugBelch("section name = %s\n", sectab_i->Name ));
2199 /* I'm sure this is the Right Way to do it. However, the
2200 alternative of testing the sectab_i->Name field seems to
2201 work ok with Cygwin.
2203 if (sectab_i->Characteristics & MYIMAGE_SCN_CNT_CODE ||
2204 sectab_i->Characteristics & MYIMAGE_SCN_CNT_INITIALIZED_DATA)
2205 kind = SECTIONKIND_CODE_OR_RODATA;
2208 if (0==strcmp(".text",sectab_i->Name) ||
2209 0==strcmp(".rdata",sectab_i->Name)||
2210 0==strcmp(".rodata",sectab_i->Name))
2211 kind = SECTIONKIND_CODE_OR_RODATA;
2212 if (0==strcmp(".data",sectab_i->Name) ||
2213 0==strcmp(".bss",sectab_i->Name))
2214 kind = SECTIONKIND_RWDATA;
2216 ASSERT(sectab_i->SizeOfRawData == 0 || sectab_i->VirtualSize == 0);
2217 sz = sectab_i->SizeOfRawData;
2218 if (sz < sectab_i->VirtualSize) sz = sectab_i->VirtualSize;
2220 start = ((UChar*)(oc->image)) + sectab_i->PointerToRawData;
2221 end = start + sz - 1;
2223 if (kind == SECTIONKIND_OTHER
2224 /* Ignore sections called which contain stabs debugging
2226 && 0 != strcmp(".stab", sectab_i->Name)
2227 && 0 != strcmp(".stabstr", sectab_i->Name)
2228 /* ignore constructor section for now */
2229 && 0 != strcmp(".ctors", sectab_i->Name)
2230 /* ignore section generated from .ident */
2231 && 0!= strcmp("/4", sectab_i->Name)
2233 errorBelch("Unknown PEi386 section name `%s' (while processing: %s)", sectab_i->Name, oc->fileName);
2237 if (kind != SECTIONKIND_OTHER && end >= start) {
2238 addSection(oc, kind, start, end);
2239 addProddableBlock(oc, start, end - start + 1);
2243 /* Copy exported symbols into the ObjectCode. */
2245 oc->n_symbols = hdr->NumberOfSymbols;
2246 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
2247 "ocGetNames_PEi386(oc->symbols)");
2248 /* Call me paranoid; I don't care. */
2249 for (i = 0; i < oc->n_symbols; i++)
2250 oc->symbols[i] = NULL;
2254 COFF_symbol* symtab_i;
2255 if (i >= (Int32)(hdr->NumberOfSymbols)) break;
2256 symtab_i = (COFF_symbol*)
2257 myindex ( sizeof_COFF_symbol, symtab, i );
2261 if (symtab_i->StorageClass == MYIMAGE_SYM_CLASS_EXTERNAL
2262 && symtab_i->SectionNumber != MYIMAGE_SYM_UNDEFINED) {
2263 /* This symbol is global and defined, viz, exported */
2264 /* for MYIMAGE_SYMCLASS_EXTERNAL
2265 && !MYIMAGE_SYM_UNDEFINED,
2266 the address of the symbol is:
2267 address of relevant section + offset in section
2269 COFF_section* sectabent
2270 = (COFF_section*) myindex ( sizeof_COFF_section,
2272 symtab_i->SectionNumber-1 );
2273 addr = ((UChar*)(oc->image))
2274 + (sectabent->PointerToRawData
2278 if (symtab_i->SectionNumber == MYIMAGE_SYM_UNDEFINED
2279 && symtab_i->Value > 0) {
2280 /* This symbol isn't in any section at all, ie, global bss.
2281 Allocate zeroed space for it. */
2282 addr = stgCallocBytes(1, symtab_i->Value,
2283 "ocGetNames_PEi386(non-anonymous bss)");
2284 addSection(oc, SECTIONKIND_RWDATA, addr,
2285 ((UChar*)addr) + symtab_i->Value - 1);
2286 addProddableBlock(oc, addr, symtab_i->Value);
2287 /* debugBelch("BSS section at 0x%x\n", addr); */
2290 if (addr != NULL ) {
2291 sname = cstring_from_COFF_symbol_name ( symtab_i->Name, strtab );
2292 /* debugBelch("addSymbol %p `%s \n", addr,sname); */
2293 IF_DEBUG(linker, debugBelch("addSymbol %p `%s'\n", addr,sname);)
2294 ASSERT(i >= 0 && i < oc->n_symbols);
2295 /* cstring_from_COFF_symbol_name always succeeds. */
2296 oc->symbols[i] = sname;
2297 ghciInsertStrHashTable(oc->fileName, symhash, sname, addr);
2301 "IGNORING symbol %d\n"
2305 printName ( symtab_i->Name, strtab );
2314 (Int32)(symtab_i->SectionNumber),
2315 (UInt32)symtab_i->Type,
2316 (UInt32)symtab_i->StorageClass,
2317 (UInt32)symtab_i->NumberOfAuxSymbols
2322 i += symtab_i->NumberOfAuxSymbols;
2331 ocResolve_PEi386 ( ObjectCode* oc )
2334 COFF_section* sectab;
2335 COFF_symbol* symtab;
2345 /* ToDo: should be variable-sized? But is at least safe in the
2346 sense of buffer-overrun-proof. */
2348 /* debugBelch("resolving for %s\n", oc->fileName); */
2350 hdr = (COFF_header*)(oc->image);
2351 sectab = (COFF_section*) (
2352 ((UChar*)(oc->image))
2353 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2355 symtab = (COFF_symbol*) (
2356 ((UChar*)(oc->image))
2357 + hdr->PointerToSymbolTable
2359 strtab = ((UChar*)(oc->image))
2360 + hdr->PointerToSymbolTable
2361 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
2363 for (i = 0; i < hdr->NumberOfSections; i++) {
2364 COFF_section* sectab_i
2366 myindex ( sizeof_COFF_section, sectab, i );
2369 ((UChar*)(oc->image)) + sectab_i->PointerToRelocations
2372 /* Ignore sections called which contain stabs debugging
2374 if (0 == strcmp(".stab", sectab_i->Name)
2375 || 0 == strcmp(".stabstr", sectab_i->Name)
2376 || 0 == strcmp(".ctors", sectab_i->Name))
2379 if ( sectab_i->Characteristics & MYIMAGE_SCN_LNK_NRELOC_OVFL ) {
2380 /* If the relocation field (a short) has overflowed, the
2381 * real count can be found in the first reloc entry.
2383 * See Section 4.1 (last para) of the PE spec (rev6.0).
2385 * Nov2003 update: the GNU linker still doesn't correctly
2386 * handle the generation of relocatable object files with
2387 * overflown relocations. Hence the output to warn of potential
2390 COFF_reloc* rel = (COFF_reloc*)
2391 myindex ( sizeof_COFF_reloc, reltab, 0 );
2392 noRelocs = rel->VirtualAddress;
2394 /* 10/05: we now assume (and check for) a GNU ld that is capable
2395 * of handling object files with (>2^16) of relocs.
2398 debugBelch("WARNING: Overflown relocation field (# relocs found: %u)\n",
2403 noRelocs = sectab_i->NumberOfRelocations;
2408 for (; j < noRelocs; j++) {
2410 COFF_reloc* reltab_j
2412 myindex ( sizeof_COFF_reloc, reltab, j );
2414 /* the location to patch */
2416 ((UChar*)(oc->image))
2417 + (sectab_i->PointerToRawData
2418 + reltab_j->VirtualAddress
2419 - sectab_i->VirtualAddress )
2421 /* the existing contents of pP */
2423 /* the symbol to connect to */
2424 sym = (COFF_symbol*)
2425 myindex ( sizeof_COFF_symbol,
2426 symtab, reltab_j->SymbolTableIndex );
2429 "reloc sec %2d num %3d: type 0x%-4x "
2430 "vaddr 0x%-8x name `",
2432 (UInt32)reltab_j->Type,
2433 reltab_j->VirtualAddress );
2434 printName ( sym->Name, strtab );
2435 debugBelch("'\n" ));
2437 if (sym->StorageClass == MYIMAGE_SYM_CLASS_STATIC) {
2438 COFF_section* section_sym
2439 = findPEi386SectionCalled ( oc, sym->Name );
2441 errorBelch("%s: can't find section `%s'", oc->fileName, sym->Name);
2444 S = ((UInt32)(oc->image))
2445 + (section_sym->PointerToRawData
2448 copyName ( sym->Name, strtab, symbol, 1000-1 );
2449 S = (UInt32) lookupLocalSymbol( oc, symbol );
2450 if ((void*)S != NULL) goto foundit;
2451 S = (UInt32) lookupSymbol( symbol );
2452 if ((void*)S != NULL) goto foundit;
2453 zapTrailingAtSign ( symbol );
2454 S = (UInt32) lookupLocalSymbol( oc, symbol );
2455 if ((void*)S != NULL) goto foundit;
2456 S = (UInt32) lookupSymbol( symbol );
2457 if ((void*)S != NULL) goto foundit;
2458 /* Newline first because the interactive linker has printed "linking..." */
2459 errorBelch("\n%s: unknown symbol `%s'", oc->fileName, symbol);
2463 checkProddableBlock(oc, pP);
2464 switch (reltab_j->Type) {
2465 case MYIMAGE_REL_I386_DIR32:
2468 case MYIMAGE_REL_I386_REL32:
2469 /* Tricky. We have to insert a displacement at
2470 pP which, when added to the PC for the _next_
2471 insn, gives the address of the target (S).
2472 Problem is to know the address of the next insn
2473 when we only know pP. We assume that this
2474 literal field is always the last in the insn,
2475 so that the address of the next insn is pP+4
2476 -- hence the constant 4.
2477 Also I don't know if A should be added, but so
2478 far it has always been zero.
2480 SOF 05/2005: 'A' (old contents of *pP) have been observed
2481 to contain values other than zero (the 'wx' object file
2482 that came with wxhaskell-0.9.4; dunno how it was compiled..).
2483 So, add displacement to old value instead of asserting
2484 A to be zero. Fixes wxhaskell-related crashes, and no other
2485 ill effects have been observed.
2487 Update: the reason why we're seeing these more elaborate
2488 relocations is due to a switch in how the NCG compiles SRTs
2489 and offsets to them from info tables. SRTs live in .(ro)data,
2490 while info tables live in .text, causing GAS to emit REL32/DISP32
2491 relocations with non-zero values. Adding the displacement is
2492 the right thing to do.
2494 *pP = S - ((UInt32)pP) - 4 + A;
2497 debugBelch("%s: unhandled PEi386 relocation type %d",
2498 oc->fileName, reltab_j->Type);
2505 IF_DEBUG(linker, debugBelch("completed %s", oc->fileName));
2509 #endif /* defined(OBJFORMAT_PEi386) */
2512 /* --------------------------------------------------------------------------
2514 * ------------------------------------------------------------------------*/
2516 #if defined(OBJFORMAT_ELF)
2521 #if defined(sparc_HOST_ARCH)
2522 # define ELF_TARGET_SPARC /* Used inside <elf.h> */
2523 #elif defined(i386_HOST_ARCH)
2524 # define ELF_TARGET_386 /* Used inside <elf.h> */
2525 #elif defined(x86_64_HOST_ARCH)
2526 # define ELF_TARGET_X64_64
2528 #elif defined (ia64_HOST_ARCH)
2529 # define ELF_TARGET_IA64 /* Used inside <elf.h> */
2531 # define ELF_FUNCTION_DESC /* calling convention uses function descriptors */
2532 # define ELF_NEED_GOT /* needs Global Offset Table */
2533 # define ELF_NEED_PLT /* needs Procedure Linkage Tables */
2536 #if !defined(openbsd_HOST_OS)
2539 /* openbsd elf has things in different places, with diff names */
2540 #include <elf_abi.h>
2541 #include <machine/reloc.h>
2542 #define R_386_32 RELOC_32
2543 #define R_386_PC32 RELOC_PC32
2547 * Define a set of types which can be used for both ELF32 and ELF64
2551 #define ELFCLASS ELFCLASS64
2552 #define Elf_Addr Elf64_Addr
2553 #define Elf_Word Elf64_Word
2554 #define Elf_Sword Elf64_Sword
2555 #define Elf_Ehdr Elf64_Ehdr
2556 #define Elf_Phdr Elf64_Phdr
2557 #define Elf_Shdr Elf64_Shdr
2558 #define Elf_Sym Elf64_Sym
2559 #define Elf_Rel Elf64_Rel
2560 #define Elf_Rela Elf64_Rela
2561 #define ELF_ST_TYPE ELF64_ST_TYPE
2562 #define ELF_ST_BIND ELF64_ST_BIND
2563 #define ELF_R_TYPE ELF64_R_TYPE
2564 #define ELF_R_SYM ELF64_R_SYM
2566 #define ELFCLASS ELFCLASS32
2567 #define Elf_Addr Elf32_Addr
2568 #define Elf_Word Elf32_Word
2569 #define Elf_Sword Elf32_Sword
2570 #define Elf_Ehdr Elf32_Ehdr
2571 #define Elf_Phdr Elf32_Phdr
2572 #define Elf_Shdr Elf32_Shdr
2573 #define Elf_Sym Elf32_Sym
2574 #define Elf_Rel Elf32_Rel
2575 #define Elf_Rela Elf32_Rela
2577 #define ELF_ST_TYPE ELF32_ST_TYPE
2580 #define ELF_ST_BIND ELF32_ST_BIND
2583 #define ELF_R_TYPE ELF32_R_TYPE
2586 #define ELF_R_SYM ELF32_R_SYM
2592 * Functions to allocate entries in dynamic sections. Currently we simply
2593 * preallocate a large number, and we don't check if a entry for the given
2594 * target already exists (a linear search is too slow). Ideally these
2595 * entries would be associated with symbols.
2598 /* These sizes sufficient to load HSbase + HShaskell98 + a few modules */
2599 #define GOT_SIZE 0x20000
2600 #define FUNCTION_TABLE_SIZE 0x10000
2601 #define PLT_SIZE 0x08000
2604 static Elf_Addr got[GOT_SIZE];
2605 static unsigned int gotIndex;
2606 static Elf_Addr gp_val = (Elf_Addr)got;
2609 allocateGOTEntry(Elf_Addr target)
2613 if (gotIndex >= GOT_SIZE)
2614 barf("Global offset table overflow");
2616 entry = &got[gotIndex++];
2618 return (Elf_Addr)entry;
2622 #ifdef ELF_FUNCTION_DESC
2628 static FunctionDesc functionTable[FUNCTION_TABLE_SIZE];
2629 static unsigned int functionTableIndex;
2632 allocateFunctionDesc(Elf_Addr target)
2634 FunctionDesc *entry;
2636 if (functionTableIndex >= FUNCTION_TABLE_SIZE)
2637 barf("Function table overflow");
2639 entry = &functionTable[functionTableIndex++];
2641 entry->gp = (Elf_Addr)gp_val;
2642 return (Elf_Addr)entry;
2646 copyFunctionDesc(Elf_Addr target)
2648 FunctionDesc *olddesc = (FunctionDesc *)target;
2649 FunctionDesc *newdesc;
2651 newdesc = (FunctionDesc *)allocateFunctionDesc(olddesc->ip);
2652 newdesc->gp = olddesc->gp;
2653 return (Elf_Addr)newdesc;
2658 #ifdef ia64_HOST_ARCH
2659 static void ia64_reloc_gprel22(Elf_Addr target, Elf_Addr value);
2660 static void ia64_reloc_pcrel21(Elf_Addr target, Elf_Addr value, ObjectCode *oc);
2662 static unsigned char plt_code[] =
2664 /* taken from binutils bfd/elfxx-ia64.c */
2665 0x0b, 0x78, 0x00, 0x02, 0x00, 0x24, /* [MMI] addl r15=0,r1;; */
2666 0x00, 0x41, 0x3c, 0x30, 0x28, 0xc0, /* ld8 r16=[r15],8 */
2667 0x01, 0x08, 0x00, 0x84, /* mov r14=r1;; */
2668 0x11, 0x08, 0x00, 0x1e, 0x18, 0x10, /* [MIB] ld8 r1=[r15] */
2669 0x60, 0x80, 0x04, 0x80, 0x03, 0x00, /* mov b6=r16 */
2670 0x60, 0x00, 0x80, 0x00 /* br.few b6;; */
2673 /* If we can't get to the function descriptor via gp, take a local copy of it */
2674 #define PLT_RELOC(code, target) { \
2675 Elf64_Sxword rel_value = target - gp_val; \
2676 if ((rel_value > 0x1fffff) || (rel_value < -0x1fffff)) \
2677 ia64_reloc_gprel22((Elf_Addr)code, copyFunctionDesc(target)); \
2679 ia64_reloc_gprel22((Elf_Addr)code, target); \
2684 unsigned char code[sizeof(plt_code)];
2688 allocatePLTEntry(Elf_Addr target, ObjectCode *oc)
2690 PLTEntry *plt = (PLTEntry *)oc->plt;
2693 if (oc->pltIndex >= PLT_SIZE)
2694 barf("Procedure table overflow");
2696 entry = &plt[oc->pltIndex++];
2697 memcpy(entry->code, plt_code, sizeof(entry->code));
2698 PLT_RELOC(entry->code, target);
2699 return (Elf_Addr)entry;
2705 return (PLT_SIZE * sizeof(PLTEntry));
2710 #if x86_64_HOST_ARCH
2711 // On x86_64, 32-bit relocations are often used, which requires that
2712 // we can resolve a symbol to a 32-bit offset. However, shared
2713 // libraries are placed outside the 2Gb area, which leaves us with a
2714 // problem when we need to give a 32-bit offset to a symbol in a
2717 // For a function symbol, we can allocate a bounce sequence inside the
2718 // 2Gb area and resolve the symbol to this. The bounce sequence is
2719 // simply a long jump instruction to the real location of the symbol.
2721 // For data references, we're screwed.
2724 unsigned char jmp[8]; /* 6 byte instruction: jmpq *0x00000002(%rip) */
2728 #define X86_64_BB_SIZE 1024
2730 static x86_64_bounce *x86_64_bounce_buffer = NULL;
2731 static nat x86_64_bb_next_off;
2734 x86_64_high_symbol( char *lbl, void *addr )
2736 x86_64_bounce *bounce;
2738 if ( x86_64_bounce_buffer == NULL ||
2739 x86_64_bb_next_off >= X86_64_BB_SIZE ) {
2740 x86_64_bounce_buffer =
2741 mmap(NULL, X86_64_BB_SIZE * sizeof(x86_64_bounce),
2742 PROT_EXEC|PROT_READ|PROT_WRITE,
2743 MAP_PRIVATE|MAP_32BIT|MAP_ANONYMOUS, -1, 0);
2744 if (x86_64_bounce_buffer == MAP_FAILED) {
2745 barf("x86_64_high_symbol: mmap failed");
2747 x86_64_bb_next_off = 0;
2749 bounce = &x86_64_bounce_buffer[x86_64_bb_next_off];
2750 bounce->jmp[0] = 0xff;
2751 bounce->jmp[1] = 0x25;
2752 bounce->jmp[2] = 0x02;
2753 bounce->jmp[3] = 0x00;
2754 bounce->jmp[4] = 0x00;
2755 bounce->jmp[5] = 0x00;
2756 bounce->addr = addr;
2757 x86_64_bb_next_off++;
2759 IF_DEBUG(linker, debugBelch("x86_64: allocated bounce entry for %s->%p at %p\n",
2760 lbl, addr, bounce));
2762 insertStrHashTable(symhash, lbl, bounce);
2769 * Generic ELF functions
2773 findElfSection ( void* objImage, Elf_Word sh_type )
2775 char* ehdrC = (char*)objImage;
2776 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2777 Elf_Shdr* shdr = (Elf_Shdr*)(ehdrC + ehdr->e_shoff);
2778 char* sh_strtab = ehdrC + shdr[ehdr->e_shstrndx].sh_offset;
2782 for (i = 0; i < ehdr->e_shnum; i++) {
2783 if (shdr[i].sh_type == sh_type
2784 /* Ignore the section header's string table. */
2785 && i != ehdr->e_shstrndx
2786 /* Ignore string tables named .stabstr, as they contain
2788 && 0 != memcmp(".stabstr", sh_strtab + shdr[i].sh_name, 8)
2790 ptr = ehdrC + shdr[i].sh_offset;
2797 #if defined(ia64_HOST_ARCH)
2799 findElfSegment ( void* objImage, Elf_Addr vaddr )
2801 char* ehdrC = (char*)objImage;
2802 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2803 Elf_Phdr* phdr = (Elf_Phdr*)(ehdrC + ehdr->e_phoff);
2804 Elf_Addr segaddr = 0;
2807 for (i = 0; i < ehdr->e_phnum; i++) {
2808 segaddr = phdr[i].p_vaddr;
2809 if ((vaddr >= segaddr) && (vaddr < segaddr + phdr[i].p_memsz))
2817 ocVerifyImage_ELF ( ObjectCode* oc )
2821 int i, j, nent, nstrtab, nsymtabs;
2825 char* ehdrC = (char*)(oc->image);
2826 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2828 if (ehdr->e_ident[EI_MAG0] != ELFMAG0 ||
2829 ehdr->e_ident[EI_MAG1] != ELFMAG1 ||
2830 ehdr->e_ident[EI_MAG2] != ELFMAG2 ||
2831 ehdr->e_ident[EI_MAG3] != ELFMAG3) {
2832 errorBelch("%s: not an ELF object", oc->fileName);
2836 if (ehdr->e_ident[EI_CLASS] != ELFCLASS) {
2837 errorBelch("%s: unsupported ELF format", oc->fileName);
2841 if (ehdr->e_ident[EI_DATA] == ELFDATA2LSB) {
2842 IF_DEBUG(linker,debugBelch( "Is little-endian\n" ));
2844 if (ehdr->e_ident[EI_DATA] == ELFDATA2MSB) {
2845 IF_DEBUG(linker,debugBelch( "Is big-endian\n" ));
2847 errorBelch("%s: unknown endiannness", oc->fileName);
2851 if (ehdr->e_type != ET_REL) {
2852 errorBelch("%s: not a relocatable object (.o) file", oc->fileName);
2855 IF_DEBUG(linker, debugBelch( "Is a relocatable object (.o) file\n" ));
2857 IF_DEBUG(linker,debugBelch( "Architecture is " ));
2858 switch (ehdr->e_machine) {
2859 case EM_386: IF_DEBUG(linker,debugBelch( "x86" )); break;
2860 #ifdef EM_SPARC32PLUS
2861 case EM_SPARC32PLUS:
2863 case EM_SPARC: IF_DEBUG(linker,debugBelch( "sparc" )); break;
2865 case EM_IA_64: IF_DEBUG(linker,debugBelch( "ia64" )); break;
2867 case EM_PPC: IF_DEBUG(linker,debugBelch( "powerpc32" )); break;
2869 case EM_X86_64: IF_DEBUG(linker,debugBelch( "x86_64" )); break;
2871 default: IF_DEBUG(linker,debugBelch( "unknown" ));
2872 errorBelch("%s: unknown architecture", oc->fileName);
2876 IF_DEBUG(linker,debugBelch(
2877 "\nSection header table: start %ld, n_entries %d, ent_size %d\n",
2878 (long)ehdr->e_shoff, ehdr->e_shnum, ehdr->e_shentsize ));
2880 ASSERT (ehdr->e_shentsize == sizeof(Elf_Shdr));
2882 shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
2884 if (ehdr->e_shstrndx == SHN_UNDEF) {
2885 errorBelch("%s: no section header string table", oc->fileName);
2888 IF_DEBUG(linker,debugBelch( "Section header string table is section %d\n",
2890 sh_strtab = ehdrC + shdr[ehdr->e_shstrndx].sh_offset;
2893 for (i = 0; i < ehdr->e_shnum; i++) {
2894 IF_DEBUG(linker,debugBelch("%2d: ", i ));
2895 IF_DEBUG(linker,debugBelch("type=%2d ", (int)shdr[i].sh_type ));
2896 IF_DEBUG(linker,debugBelch("size=%4d ", (int)shdr[i].sh_size ));
2897 IF_DEBUG(linker,debugBelch("offs=%4d ", (int)shdr[i].sh_offset ));
2898 IF_DEBUG(linker,debugBelch(" (%p .. %p) ",
2899 ehdrC + shdr[i].sh_offset,
2900 ehdrC + shdr[i].sh_offset + shdr[i].sh_size - 1));
2902 if (shdr[i].sh_type == SHT_REL) {
2903 IF_DEBUG(linker,debugBelch("Rel " ));
2904 } else if (shdr[i].sh_type == SHT_RELA) {
2905 IF_DEBUG(linker,debugBelch("RelA " ));
2907 IF_DEBUG(linker,debugBelch(" "));
2910 IF_DEBUG(linker,debugBelch("sname=%s\n", sh_strtab + shdr[i].sh_name ));
2914 IF_DEBUG(linker,debugBelch( "\nString tables" ));
2917 for (i = 0; i < ehdr->e_shnum; i++) {
2918 if (shdr[i].sh_type == SHT_STRTAB
2919 /* Ignore the section header's string table. */
2920 && i != ehdr->e_shstrndx
2921 /* Ignore string tables named .stabstr, as they contain
2923 && 0 != memcmp(".stabstr", sh_strtab + shdr[i].sh_name, 8)
2925 IF_DEBUG(linker,debugBelch(" section %d is a normal string table", i ));
2926 strtab = ehdrC + shdr[i].sh_offset;
2931 errorBelch("%s: no string tables, or too many", oc->fileName);
2936 IF_DEBUG(linker,debugBelch( "\nSymbol tables" ));
2937 for (i = 0; i < ehdr->e_shnum; i++) {
2938 if (shdr[i].sh_type != SHT_SYMTAB) continue;
2939 IF_DEBUG(linker,debugBelch( "section %d is a symbol table\n", i ));
2941 stab = (Elf_Sym*) (ehdrC + shdr[i].sh_offset);
2942 nent = shdr[i].sh_size / sizeof(Elf_Sym);
2943 IF_DEBUG(linker,debugBelch( " number of entries is apparently %d (%ld rem)\n",
2945 (long)shdr[i].sh_size % sizeof(Elf_Sym)
2947 if (0 != shdr[i].sh_size % sizeof(Elf_Sym)) {
2948 errorBelch("%s: non-integral number of symbol table entries", oc->fileName);
2951 for (j = 0; j < nent; j++) {
2952 IF_DEBUG(linker,debugBelch(" %2d ", j ));
2953 IF_DEBUG(linker,debugBelch(" sec=%-5d size=%-3d val=%5p ",
2954 (int)stab[j].st_shndx,
2955 (int)stab[j].st_size,
2956 (char*)stab[j].st_value ));
2958 IF_DEBUG(linker,debugBelch("type=" ));
2959 switch (ELF_ST_TYPE(stab[j].st_info)) {
2960 case STT_NOTYPE: IF_DEBUG(linker,debugBelch("notype " )); break;
2961 case STT_OBJECT: IF_DEBUG(linker,debugBelch("object " )); break;
2962 case STT_FUNC : IF_DEBUG(linker,debugBelch("func " )); break;
2963 case STT_SECTION: IF_DEBUG(linker,debugBelch("section" )); break;
2964 case STT_FILE: IF_DEBUG(linker,debugBelch("file " )); break;
2965 default: IF_DEBUG(linker,debugBelch("? " )); break;
2967 IF_DEBUG(linker,debugBelch(" " ));
2969 IF_DEBUG(linker,debugBelch("bind=" ));
2970 switch (ELF_ST_BIND(stab[j].st_info)) {
2971 case STB_LOCAL : IF_DEBUG(linker,debugBelch("local " )); break;
2972 case STB_GLOBAL: IF_DEBUG(linker,debugBelch("global" )); break;
2973 case STB_WEAK : IF_DEBUG(linker,debugBelch("weak " )); break;
2974 default: IF_DEBUG(linker,debugBelch("? " )); break;
2976 IF_DEBUG(linker,debugBelch(" " ));
2978 IF_DEBUG(linker,debugBelch("name=%s\n", strtab + stab[j].st_name ));
2982 if (nsymtabs == 0) {
2983 errorBelch("%s: didn't find any symbol tables", oc->fileName);
2990 static int getSectionKind_ELF( Elf_Shdr *hdr, int *is_bss )
2994 if (hdr->sh_type == SHT_PROGBITS
2995 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_EXECINSTR)) {
2996 /* .text-style section */
2997 return SECTIONKIND_CODE_OR_RODATA;
3000 if (hdr->sh_type == SHT_PROGBITS
3001 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_WRITE)) {
3002 /* .data-style section */
3003 return SECTIONKIND_RWDATA;
3006 if (hdr->sh_type == SHT_PROGBITS
3007 && (hdr->sh_flags & SHF_ALLOC) && !(hdr->sh_flags & SHF_WRITE)) {
3008 /* .rodata-style section */
3009 return SECTIONKIND_CODE_OR_RODATA;
3012 if (hdr->sh_type == SHT_NOBITS
3013 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_WRITE)) {
3014 /* .bss-style section */
3016 return SECTIONKIND_RWDATA;
3019 return SECTIONKIND_OTHER;
3024 ocGetNames_ELF ( ObjectCode* oc )
3029 char* ehdrC = (char*)(oc->image);
3030 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
3031 char* strtab = findElfSection ( ehdrC, SHT_STRTAB );
3032 Elf_Shdr* shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
3034 ASSERT(symhash != NULL);
3037 errorBelch("%s: no strtab", oc->fileName);
3042 for (i = 0; i < ehdr->e_shnum; i++) {
3043 /* Figure out what kind of section it is. Logic derived from
3044 Figure 1.14 ("Special Sections") of the ELF document
3045 ("Portable Formats Specification, Version 1.1"). */
3047 SectionKind kind = getSectionKind_ELF(&shdr[i], &is_bss);
3049 if (is_bss && shdr[i].sh_size > 0) {
3050 /* This is a non-empty .bss section. Allocate zeroed space for
3051 it, and set its .sh_offset field such that
3052 ehdrC + .sh_offset == addr_of_zeroed_space. */
3053 char* zspace = stgCallocBytes(1, shdr[i].sh_size,
3054 "ocGetNames_ELF(BSS)");
3055 shdr[i].sh_offset = ((char*)zspace) - ((char*)ehdrC);
3057 debugBelch("BSS section at 0x%x, size %d\n",
3058 zspace, shdr[i].sh_size);
3062 /* fill in the section info */
3063 if (kind != SECTIONKIND_OTHER && shdr[i].sh_size > 0) {
3064 addProddableBlock(oc, ehdrC + shdr[i].sh_offset, shdr[i].sh_size);
3065 addSection(oc, kind, ehdrC + shdr[i].sh_offset,
3066 ehdrC + shdr[i].sh_offset + shdr[i].sh_size - 1);
3069 if (shdr[i].sh_type != SHT_SYMTAB) continue;
3071 /* copy stuff into this module's object symbol table */
3072 stab = (Elf_Sym*) (ehdrC + shdr[i].sh_offset);
3073 nent = shdr[i].sh_size / sizeof(Elf_Sym);
3075 oc->n_symbols = nent;
3076 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
3077 "ocGetNames_ELF(oc->symbols)");
3079 for (j = 0; j < nent; j++) {
3081 char isLocal = FALSE; /* avoids uninit-var warning */
3083 char* nm = strtab + stab[j].st_name;
3084 int secno = stab[j].st_shndx;
3086 /* Figure out if we want to add it; if so, set ad to its
3087 address. Otherwise leave ad == NULL. */
3089 if (secno == SHN_COMMON) {
3091 ad = stgCallocBytes(1, stab[j].st_size, "ocGetNames_ELF(COMMON)");
3093 debugBelch("COMMON symbol, size %d name %s\n",
3094 stab[j].st_size, nm);
3096 /* Pointless to do addProddableBlock() for this area,
3097 since the linker should never poke around in it. */
3100 if ( ( ELF_ST_BIND(stab[j].st_info)==STB_GLOBAL
3101 || ELF_ST_BIND(stab[j].st_info)==STB_LOCAL
3103 /* and not an undefined symbol */
3104 && stab[j].st_shndx != SHN_UNDEF
3105 /* and not in a "special section" */
3106 && stab[j].st_shndx < SHN_LORESERVE
3108 /* and it's a not a section or string table or anything silly */
3109 ( ELF_ST_TYPE(stab[j].st_info)==STT_FUNC ||
3110 ELF_ST_TYPE(stab[j].st_info)==STT_OBJECT ||
3111 ELF_ST_TYPE(stab[j].st_info)==STT_NOTYPE
3114 /* Section 0 is the undefined section, hence > and not >=. */
3115 ASSERT(secno > 0 && secno < ehdr->e_shnum);
3117 if (shdr[secno].sh_type == SHT_NOBITS) {
3118 debugBelch(" BSS symbol, size %d off %d name %s\n",
3119 stab[j].st_size, stab[j].st_value, nm);
3122 ad = ehdrC + shdr[ secno ].sh_offset + stab[j].st_value;
3123 if (ELF_ST_BIND(stab[j].st_info)==STB_LOCAL) {
3126 #ifdef ELF_FUNCTION_DESC
3127 /* dlsym() and the initialisation table both give us function
3128 * descriptors, so to be consistent we store function descriptors
3129 * in the symbol table */
3130 if (ELF_ST_TYPE(stab[j].st_info) == STT_FUNC)
3131 ad = (char *)allocateFunctionDesc((Elf_Addr)ad);
3133 IF_DEBUG(linker,debugBelch( "addOTabName(GLOB): %10p %s %s",
3134 ad, oc->fileName, nm ));
3139 /* And the decision is ... */
3143 oc->symbols[j] = nm;
3146 /* Ignore entirely. */
3148 ghciInsertStrHashTable(oc->fileName, symhash, nm, ad);
3152 IF_DEBUG(linker,debugBelch( "skipping `%s'\n",
3153 strtab + stab[j].st_name ));
3156 "skipping bind = %d, type = %d, shndx = %d `%s'\n",
3157 (int)ELF_ST_BIND(stab[j].st_info),
3158 (int)ELF_ST_TYPE(stab[j].st_info),
3159 (int)stab[j].st_shndx,
3160 strtab + stab[j].st_name
3163 oc->symbols[j] = NULL;
3172 /* Do ELF relocations which lack an explicit addend. All x86-linux
3173 relocations appear to be of this form. */
3175 do_Elf_Rel_relocations ( ObjectCode* oc, char* ehdrC,
3176 Elf_Shdr* shdr, int shnum,
3177 Elf_Sym* stab, char* strtab )
3182 Elf_Rel* rtab = (Elf_Rel*) (ehdrC + shdr[shnum].sh_offset);
3183 int nent = shdr[shnum].sh_size / sizeof(Elf_Rel);
3184 int target_shndx = shdr[shnum].sh_info;
3185 int symtab_shndx = shdr[shnum].sh_link;
3187 stab = (Elf_Sym*) (ehdrC + shdr[ symtab_shndx ].sh_offset);
3188 targ = (Elf_Word*)(ehdrC + shdr[ target_shndx ].sh_offset);
3189 IF_DEBUG(linker,debugBelch( "relocations for section %d using symtab %d\n",
3190 target_shndx, symtab_shndx ));
3192 /* Skip sections that we're not interested in. */
3195 SectionKind kind = getSectionKind_ELF(&shdr[target_shndx], &is_bss);
3196 if (kind == SECTIONKIND_OTHER) {
3197 IF_DEBUG(linker,debugBelch( "skipping (target section not loaded)"));
3202 for (j = 0; j < nent; j++) {
3203 Elf_Addr offset = rtab[j].r_offset;
3204 Elf_Addr info = rtab[j].r_info;
3206 Elf_Addr P = ((Elf_Addr)targ) + offset;
3207 Elf_Word* pP = (Elf_Word*)P;
3212 StgStablePtr stablePtr;
3215 IF_DEBUG(linker,debugBelch( "Rel entry %3d is raw(%6p %6p)",
3216 j, (void*)offset, (void*)info ));
3218 IF_DEBUG(linker,debugBelch( " ZERO" ));
3221 Elf_Sym sym = stab[ELF_R_SYM(info)];
3222 /* First see if it is a local symbol. */
3223 if (ELF_ST_BIND(sym.st_info) == STB_LOCAL) {
3224 /* Yes, so we can get the address directly from the ELF symbol
3226 symbol = sym.st_name==0 ? "(noname)" : strtab+sym.st_name;
3228 (ehdrC + shdr[ sym.st_shndx ].sh_offset
3229 + stab[ELF_R_SYM(info)].st_value);
3232 symbol = strtab + sym.st_name;
3233 stablePtr = (StgStablePtr)lookupHashTable(stablehash, (StgWord)symbol);
3234 if (NULL == stablePtr) {
3235 /* No, so look up the name in our global table. */
3236 S_tmp = lookupSymbol( symbol );
3237 S = (Elf_Addr)S_tmp;
3239 stableVal = deRefStablePtr( stablePtr );
3241 S = (Elf_Addr)S_tmp;
3245 errorBelch("%s: unknown symbol `%s'", oc->fileName, symbol);
3248 IF_DEBUG(linker,debugBelch( "`%s' resolves to %p\n", symbol, (void*)S ));
3251 IF_DEBUG(linker,debugBelch( "Reloc: P = %p S = %p A = %p\n",
3252 (void*)P, (void*)S, (void*)A ));
3253 checkProddableBlock ( oc, pP );
3257 switch (ELF_R_TYPE(info)) {
3258 # ifdef i386_HOST_ARCH
3259 case R_386_32: *pP = value; break;
3260 case R_386_PC32: *pP = value - P; break;
3263 errorBelch("%s: unhandled ELF relocation(Rel) type %lu\n",
3264 oc->fileName, (lnat)ELF_R_TYPE(info));
3272 /* Do ELF relocations for which explicit addends are supplied.
3273 sparc-solaris relocations appear to be of this form. */
3275 do_Elf_Rela_relocations ( ObjectCode* oc, char* ehdrC,
3276 Elf_Shdr* shdr, int shnum,
3277 Elf_Sym* stab, char* strtab )
3280 char *symbol = NULL;
3282 Elf_Rela* rtab = (Elf_Rela*) (ehdrC + shdr[shnum].sh_offset);
3283 int nent = shdr[shnum].sh_size / sizeof(Elf_Rela);
3284 int target_shndx = shdr[shnum].sh_info;
3285 int symtab_shndx = shdr[shnum].sh_link;
3287 stab = (Elf_Sym*) (ehdrC + shdr[ symtab_shndx ].sh_offset);
3288 targ = (Elf_Addr) (ehdrC + shdr[ target_shndx ].sh_offset);
3289 IF_DEBUG(linker,debugBelch( "relocations for section %d using symtab %d\n",
3290 target_shndx, symtab_shndx ));
3292 for (j = 0; j < nent; j++) {
3293 #if defined(DEBUG) || defined(sparc_HOST_ARCH) || defined(ia64_HOST_ARCH) || defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH)
3294 /* This #ifdef only serves to avoid unused-var warnings. */
3295 Elf_Addr offset = rtab[j].r_offset;
3296 Elf_Addr P = targ + offset;
3298 Elf_Addr info = rtab[j].r_info;
3299 Elf_Addr A = rtab[j].r_addend;
3303 # if defined(sparc_HOST_ARCH)
3304 Elf_Word* pP = (Elf_Word*)P;
3306 # elif defined(ia64_HOST_ARCH)
3307 Elf64_Xword *pP = (Elf64_Xword *)P;
3309 # elif defined(powerpc_HOST_ARCH)
3313 IF_DEBUG(linker,debugBelch( "Rel entry %3d is raw(%6p %6p %6p) ",
3314 j, (void*)offset, (void*)info,
3317 IF_DEBUG(linker,debugBelch( " ZERO" ));
3320 Elf_Sym sym = stab[ELF_R_SYM(info)];
3321 /* First see if it is a local symbol. */
3322 if (ELF_ST_BIND(sym.st_info) == STB_LOCAL) {
3323 /* Yes, so we can get the address directly from the ELF symbol
3325 symbol = sym.st_name==0 ? "(noname)" : strtab+sym.st_name;
3327 (ehdrC + shdr[ sym.st_shndx ].sh_offset
3328 + stab[ELF_R_SYM(info)].st_value);
3329 #ifdef ELF_FUNCTION_DESC
3330 /* Make a function descriptor for this function */
3331 if (S && ELF_ST_TYPE(sym.st_info) == STT_FUNC) {
3332 S = allocateFunctionDesc(S + A);
3337 /* No, so look up the name in our global table. */
3338 symbol = strtab + sym.st_name;
3339 S_tmp = lookupSymbol( symbol );
3340 S = (Elf_Addr)S_tmp;
3342 #ifdef ELF_FUNCTION_DESC
3343 /* If a function, already a function descriptor - we would
3344 have to copy it to add an offset. */
3345 if (S && (ELF_ST_TYPE(sym.st_info) == STT_FUNC) && (A != 0))
3346 errorBelch("%s: function %s with addend %p", oc->fileName, symbol, (void *)A);
3350 errorBelch("%s: unknown symbol `%s'", oc->fileName, symbol);
3353 IF_DEBUG(linker,debugBelch( "`%s' resolves to %p", symbol, (void*)S ));
3356 IF_DEBUG(linker,debugBelch("Reloc: P = %p S = %p A = %p\n",
3357 (void*)P, (void*)S, (void*)A ));
3358 /* checkProddableBlock ( oc, (void*)P ); */
3362 switch (ELF_R_TYPE(info)) {
3363 # if defined(sparc_HOST_ARCH)
3364 case R_SPARC_WDISP30:
3365 w1 = *pP & 0xC0000000;
3366 w2 = (Elf_Word)((value - P) >> 2);
3367 ASSERT((w2 & 0xC0000000) == 0);
3372 w1 = *pP & 0xFFC00000;
3373 w2 = (Elf_Word)(value >> 10);
3374 ASSERT((w2 & 0xFFC00000) == 0);
3380 w2 = (Elf_Word)(value & 0x3FF);
3381 ASSERT((w2 & ~0x3FF) == 0);
3385 /* According to the Sun documentation:
3387 This relocation type resembles R_SPARC_32, except it refers to an
3388 unaligned word. That is, the word to be relocated must be treated
3389 as four separate bytes with arbitrary alignment, not as a word
3390 aligned according to the architecture requirements.
3392 (JRS: which means that freeloading on the R_SPARC_32 case
3393 is probably wrong, but hey ...)
3397 w2 = (Elf_Word)value;
3400 # elif defined(ia64_HOST_ARCH)
3401 case R_IA64_DIR64LSB:
3402 case R_IA64_FPTR64LSB:
3405 case R_IA64_PCREL64LSB:
3408 case R_IA64_SEGREL64LSB:
3409 addr = findElfSegment(ehdrC, value);
3412 case R_IA64_GPREL22:
3413 ia64_reloc_gprel22(P, value);
3415 case R_IA64_LTOFF22:
3416 case R_IA64_LTOFF22X:
3417 case R_IA64_LTOFF_FPTR22:
3418 addr = allocateGOTEntry(value);
3419 ia64_reloc_gprel22(P, addr);
3421 case R_IA64_PCREL21B:
3422 ia64_reloc_pcrel21(P, S, oc);
3425 /* This goes with R_IA64_LTOFF22X and points to the load to
3426 * convert into a move. We don't implement relaxation. */
3428 # elif defined(powerpc_HOST_ARCH)
3429 case R_PPC_ADDR16_LO:
3430 *(Elf32_Half*) P = value;
3433 case R_PPC_ADDR16_HI:
3434 *(Elf32_Half*) P = value >> 16;
3437 case R_PPC_ADDR16_HA:
3438 *(Elf32_Half*) P = (value + 0x8000) >> 16;
3442 *(Elf32_Word *) P = value;
3446 *(Elf32_Word *) P = value - P;
3452 if( delta << 6 >> 6 != delta )
3454 value = (Elf_Addr) (&makeSymbolExtra( oc, ELF_R_SYM(info), value )
3458 if( value == 0 || delta << 6 >> 6 != delta )
3460 barf( "Unable to make SymbolExtra for #%d",
3466 *(Elf_Word *) P = (*(Elf_Word *) P & 0xfc000003)
3467 | (delta & 0x3fffffc);
3471 #if x86_64_HOST_ARCH
3473 *(Elf64_Xword *)P = value;
3478 StgInt64 off = value - P;
3479 if (off >= 0x7fffffffL || off < -0x80000000L) {
3480 barf("R_X86_64_PC32 relocation out of range: %s = %p",
3483 *(Elf64_Word *)P = (Elf64_Word)off;
3488 if (value >= 0x7fffffffL) {
3489 barf("R_X86_64_32 relocation out of range: %s = %p\n",
3492 *(Elf64_Word *)P = (Elf64_Word)value;
3496 if ((StgInt64)value > 0x7fffffffL || (StgInt64)value < -0x80000000L) {
3497 barf("R_X86_64_32S relocation out of range: %s = %p\n",
3500 *(Elf64_Sword *)P = (Elf64_Sword)value;
3505 errorBelch("%s: unhandled ELF relocation(RelA) type %lu\n",
3506 oc->fileName, (lnat)ELF_R_TYPE(info));
3515 ocResolve_ELF ( ObjectCode* oc )
3519 Elf_Sym* stab = NULL;
3520 char* ehdrC = (char*)(oc->image);
3521 Elf_Ehdr* ehdr = (Elf_Ehdr*) ehdrC;
3522 Elf_Shdr* shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
3524 /* first find "the" symbol table */
3525 stab = (Elf_Sym*) findElfSection ( ehdrC, SHT_SYMTAB );
3527 /* also go find the string table */
3528 strtab = findElfSection ( ehdrC, SHT_STRTAB );
3530 if (stab == NULL || strtab == NULL) {
3531 errorBelch("%s: can't find string or symbol table", oc->fileName);
3535 /* Process the relocation sections. */
3536 for (shnum = 0; shnum < ehdr->e_shnum; shnum++) {
3537 if (shdr[shnum].sh_type == SHT_REL) {
3538 ok = do_Elf_Rel_relocations ( oc, ehdrC, shdr,
3539 shnum, stab, strtab );
3543 if (shdr[shnum].sh_type == SHT_RELA) {
3544 ok = do_Elf_Rela_relocations ( oc, ehdrC, shdr,
3545 shnum, stab, strtab );
3550 /* Free the local symbol table; we won't need it again. */
3551 freeHashTable(oc->lochash, NULL);
3554 #if defined(powerpc_HOST_ARCH)
3555 ocFlushInstructionCache( oc );
3563 * Instructions are 41 bits long, packed into 128 bit bundles with a 5-bit template
3564 * at the front. The following utility functions pack and unpack instructions, and
3565 * take care of the most common relocations.
3568 #ifdef ia64_HOST_ARCH
3571 ia64_extract_instruction(Elf64_Xword *target)
3574 int slot = (Elf_Addr)target & 3;
3575 target = (Elf_Addr)target & ~3;
3583 return ((w1 >> 5) & 0x1ffffffffff);
3585 return (w1 >> 46) | ((w2 & 0x7fffff) << 18);
3589 barf("ia64_extract_instruction: invalid slot %p", target);
3594 ia64_deposit_instruction(Elf64_Xword *target, Elf64_Xword value)
3596 int slot = (Elf_Addr)target & 3;
3597 target = (Elf_Addr)target & ~3;
3602 *target |= value << 5;
3605 *target |= value << 46;
3606 *(target+1) |= value >> 18;
3609 *(target+1) |= value << 23;
3615 ia64_reloc_gprel22(Elf_Addr target, Elf_Addr value)
3617 Elf64_Xword instruction;
3618 Elf64_Sxword rel_value;
3620 rel_value = value - gp_val;
3621 if ((rel_value > 0x1fffff) || (rel_value < -0x1fffff))
3622 barf("GP-relative data out of range (address = 0x%lx, gp = 0x%lx)", value, gp_val);
3624 instruction = ia64_extract_instruction((Elf64_Xword *)target);
3625 instruction |= (((rel_value >> 0) & 0x07f) << 13) /* imm7b */
3626 | (((rel_value >> 7) & 0x1ff) << 27) /* imm9d */
3627 | (((rel_value >> 16) & 0x01f) << 22) /* imm5c */
3628 | ((Elf64_Xword)(rel_value < 0) << 36); /* s */
3629 ia64_deposit_instruction((Elf64_Xword *)target, instruction);
3633 ia64_reloc_pcrel21(Elf_Addr target, Elf_Addr value, ObjectCode *oc)
3635 Elf64_Xword instruction;
3636 Elf64_Sxword rel_value;
3639 entry = allocatePLTEntry(value, oc);
3641 rel_value = (entry >> 4) - (target >> 4);
3642 if ((rel_value > 0xfffff) || (rel_value < -0xfffff))
3643 barf("PLT entry too far away (entry = 0x%lx, target = 0x%lx)", entry, target);
3645 instruction = ia64_extract_instruction((Elf64_Xword *)target);
3646 instruction |= ((rel_value & 0xfffff) << 13) /* imm20b */
3647 | ((Elf64_Xword)(rel_value < 0) << 36); /* s */
3648 ia64_deposit_instruction((Elf64_Xword *)target, instruction);
3654 * PowerPC ELF specifics
3657 #ifdef powerpc_HOST_ARCH
3659 static int ocAllocateSymbolExtras_ELF( ObjectCode *oc )
3665 ehdr = (Elf_Ehdr *) oc->image;
3666 shdr = (Elf_Shdr *) ( ((char *)oc->image) + ehdr->e_shoff );
3668 for( i = 0; i < ehdr->e_shnum; i++ )
3669 if( shdr[i].sh_type == SHT_SYMTAB )
3672 if( i == ehdr->e_shnum )
3674 errorBelch( "This ELF file contains no symtab" );
3678 if( shdr[i].sh_entsize != sizeof( Elf_Sym ) )
3680 errorBelch( "The entry size (%d) of the symtab isn't %d\n",
3681 shdr[i].sh_entsize, sizeof( Elf_Sym ) );
3686 return ocAllocateSymbolExtras( oc, shdr[i].sh_size / sizeof( Elf_Sym ), 0 );
3689 #endif /* powerpc */
3693 /* --------------------------------------------------------------------------
3695 * ------------------------------------------------------------------------*/
3697 #if defined(OBJFORMAT_MACHO)
3700 Support for MachO linking on Darwin/MacOS X
3701 by Wolfgang Thaller (wolfgang.thaller@gmx.net)
3703 I hereby formally apologize for the hackish nature of this code.
3704 Things that need to be done:
3705 *) implement ocVerifyImage_MachO
3706 *) add still more sanity checks.
3709 #if x86_64_HOST_ARCH || powerpc64_HOST_ARCH
3710 #define mach_header mach_header_64
3711 #define segment_command segment_command_64
3712 #define section section_64
3713 #define nlist nlist_64
3716 #ifdef powerpc_HOST_ARCH
3717 static int ocAllocateSymbolExtras_MachO(ObjectCode* oc)
3719 struct mach_header *header = (struct mach_header *) oc->image;
3720 struct load_command *lc = (struct load_command *) (header + 1);
3723 for( i = 0; i < header->ncmds; i++ )
3725 if( lc->cmd == LC_SYMTAB )
3727 // Find out the first and last undefined external
3728 // symbol, so we don't have to allocate too many
3730 struct symtab_command *symLC = (struct symtab_command *) lc;
3731 unsigned min = symLC->nsyms, max = 0;
3732 struct nlist *nlist =
3733 symLC ? (struct nlist*) ((char*) oc->image + symLC->symoff)
3735 for(i=0;i<symLC->nsyms;i++)
3737 if(nlist[i].n_type & N_STAB)
3739 else if(nlist[i].n_type & N_EXT)
3741 if((nlist[i].n_type & N_TYPE) == N_UNDF
3742 && (nlist[i].n_value == 0))
3752 return ocAllocateSymbolExtras(oc, max - min + 1, min);
3757 lc = (struct load_command *) ( ((char *)lc) + lc->cmdsize );
3759 return ocAllocateSymbolExtras(oc,0,0);
3762 #ifdef x86_64_HOST_ARCH
3763 static int ocAllocateSymbolExtras_MachO(ObjectCode* oc)
3765 struct mach_header *header = (struct mach_header *) oc->image;
3766 struct load_command *lc = (struct load_command *) (header + 1);
3769 for( i = 0; i < header->ncmds; i++ )
3771 if( lc->cmd == LC_SYMTAB )
3773 // Just allocate one entry for every symbol
3774 struct symtab_command *symLC = (struct symtab_command *) lc;
3776 return ocAllocateSymbolExtras(oc, symLC->nsyms, 0);
3779 lc = (struct load_command *) ( ((char *)lc) + lc->cmdsize );
3781 return ocAllocateSymbolExtras(oc,0,0);
3785 static int ocVerifyImage_MachO(ObjectCode* oc)
3787 char *image = (char*) oc->image;
3788 struct mach_header *header = (struct mach_header*) image;
3790 #if x86_64_TARGET_ARCH || powerpc64_TARGET_ARCH
3791 if(header->magic != MH_MAGIC_64)
3794 if(header->magic != MH_MAGIC)
3797 // FIXME: do some more verifying here
3801 static int resolveImports(
3804 struct symtab_command *symLC,
3805 struct section *sect, // ptr to lazy or non-lazy symbol pointer section
3806 unsigned long *indirectSyms,
3807 struct nlist *nlist)
3810 size_t itemSize = 4;
3813 int isJumpTable = 0;
3814 if(!strcmp(sect->sectname,"__jump_table"))
3818 ASSERT(sect->reserved2 == itemSize);
3822 for(i=0; i*itemSize < sect->size;i++)
3824 // according to otool, reserved1 contains the first index into the indirect symbol table
3825 struct nlist *symbol = &nlist[indirectSyms[sect->reserved1+i]];
3826 char *nm = image + symLC->stroff + symbol->n_un.n_strx;
3829 if((symbol->n_type & N_TYPE) == N_UNDF
3830 && (symbol->n_type & N_EXT) && (symbol->n_value != 0))
3831 addr = (void*) (symbol->n_value);
3832 else if((addr = lookupLocalSymbol(oc,nm)) != NULL)
3835 addr = lookupSymbol(nm);
3838 errorBelch("\n%s: unknown symbol `%s'", oc->fileName, nm);
3846 checkProddableBlock(oc,image + sect->offset + i*itemSize);
3847 *(image + sect->offset + i*itemSize) = 0xe9; // jmp
3848 *(unsigned*)(image + sect->offset + i*itemSize + 1)
3849 = (char*)addr - (image + sect->offset + i*itemSize + 5);
3854 checkProddableBlock(oc,((void**)(image + sect->offset)) + i);
3855 ((void**)(image + sect->offset))[i] = addr;
3862 static unsigned long relocateAddress(
3865 struct section* sections,
3866 unsigned long address)
3869 for(i = 0; i < nSections; i++)
3871 if(sections[i].addr <= address
3872 && address < sections[i].addr + sections[i].size)
3874 return (unsigned long)oc->image
3875 + sections[i].offset + address - sections[i].addr;
3878 barf("Invalid Mach-O file:"
3879 "Address out of bounds while relocating object file");
3883 static int relocateSection(
3886 struct symtab_command *symLC, struct nlist *nlist,
3887 int nSections, struct section* sections, struct section *sect)
3889 struct relocation_info *relocs;
3892 if(!strcmp(sect->sectname,"__la_symbol_ptr"))
3894 else if(!strcmp(sect->sectname,"__nl_symbol_ptr"))
3896 else if(!strcmp(sect->sectname,"__la_sym_ptr2"))
3898 else if(!strcmp(sect->sectname,"__la_sym_ptr3"))
3902 relocs = (struct relocation_info*) (image + sect->reloff);
3906 #ifdef x86_64_HOST_ARCH
3907 struct relocation_info *reloc = &relocs[i];
3909 char *thingPtr = image + sect->offset + reloc->r_address;
3913 int type = reloc->r_type;
3915 checkProddableBlock(oc,thingPtr);
3916 switch(reloc->r_length)
3919 thing = *(uint8_t*)thingPtr;
3920 baseValue = (uint64_t)thingPtr + 1;
3923 thing = *(uint16_t*)thingPtr;
3924 baseValue = (uint64_t)thingPtr + 2;
3927 thing = *(uint32_t*)thingPtr;
3928 baseValue = (uint64_t)thingPtr + 4;
3931 thing = *(uint64_t*)thingPtr;
3932 baseValue = (uint64_t)thingPtr + 8;
3935 barf("Unknown size.");
3938 if(type == X86_64_RELOC_GOT
3939 || type == X86_64_RELOC_GOT_LOAD)
3941 ASSERT(reloc->r_extern);
3942 value = (uint64_t) &makeSymbolExtra(oc, reloc->r_symbolnum, value)->addr;
3944 type = X86_64_RELOC_SIGNED;
3946 else if(reloc->r_extern)
3948 struct nlist *symbol = &nlist[reloc->r_symbolnum];
3949 char *nm = image + symLC->stroff + symbol->n_un.n_strx;
3950 if(symbol->n_value == 0)
3951 value = (uint64_t) lookupSymbol(nm);
3953 value = relocateAddress(oc, nSections, sections,
3958 value = sections[reloc->r_symbolnum-1].offset
3959 - sections[reloc->r_symbolnum-1].addr
3963 if(type == X86_64_RELOC_BRANCH)
3965 if((int32_t)(value - baseValue) != (int64_t)(value - baseValue))
3967 ASSERT(reloc->r_extern);
3968 value = (uint64_t) &makeSymbolExtra(oc, reloc->r_symbolnum, value)
3971 ASSERT((int32_t)(value - baseValue) == (int64_t)(value - baseValue));
3972 type = X86_64_RELOC_SIGNED;
3977 case X86_64_RELOC_UNSIGNED:
3978 ASSERT(!reloc->r_pcrel);
3981 case X86_64_RELOC_SIGNED:
3982 ASSERT(reloc->r_pcrel);
3983 thing += value - baseValue;
3985 case X86_64_RELOC_SUBTRACTOR:
3986 ASSERT(!reloc->r_pcrel);
3990 barf("unkown relocation");
3993 switch(reloc->r_length)
3996 *(uint8_t*)thingPtr = thing;
3999 *(uint16_t*)thingPtr = thing;
4002 *(uint32_t*)thingPtr = thing;
4005 *(uint64_t*)thingPtr = thing;
4009 if(relocs[i].r_address & R_SCATTERED)
4011 struct scattered_relocation_info *scat =
4012 (struct scattered_relocation_info*) &relocs[i];
4016 if(scat->r_length == 2)
4018 unsigned long word = 0;
4019 unsigned long* wordPtr = (unsigned long*) (image + sect->offset + scat->r_address);
4020 checkProddableBlock(oc,wordPtr);
4022 // Note on relocation types:
4023 // i386 uses the GENERIC_RELOC_* types,
4024 // while ppc uses special PPC_RELOC_* types.
4025 // *_RELOC_VANILLA and *_RELOC_PAIR have the same value
4026 // in both cases, all others are different.
4027 // Therefore, we use GENERIC_RELOC_VANILLA
4028 // and GENERIC_RELOC_PAIR instead of the PPC variants,
4029 // and use #ifdefs for the other types.
4031 // Step 1: Figure out what the relocated value should be
4032 if(scat->r_type == GENERIC_RELOC_VANILLA)
4034 word = *wordPtr + (unsigned long) relocateAddress(
4041 #ifdef powerpc_HOST_ARCH
4042 else if(scat->r_type == PPC_RELOC_SECTDIFF
4043 || scat->r_type == PPC_RELOC_LO16_SECTDIFF
4044 || scat->r_type == PPC_RELOC_HI16_SECTDIFF
4045 || scat->r_type == PPC_RELOC_HA16_SECTDIFF)
4047 else if(scat->r_type == GENERIC_RELOC_SECTDIFF)
4050 struct scattered_relocation_info *pair =
4051 (struct scattered_relocation_info*) &relocs[i+1];
4053 if(!pair->r_scattered || pair->r_type != GENERIC_RELOC_PAIR)
4054 barf("Invalid Mach-O file: "
4055 "RELOC_*_SECTDIFF not followed by RELOC_PAIR");
4057 word = (unsigned long)
4058 (relocateAddress(oc, nSections, sections, scat->r_value)
4059 - relocateAddress(oc, nSections, sections, pair->r_value));
4062 #ifdef powerpc_HOST_ARCH
4063 else if(scat->r_type == PPC_RELOC_HI16
4064 || scat->r_type == PPC_RELOC_LO16
4065 || scat->r_type == PPC_RELOC_HA16
4066 || scat->r_type == PPC_RELOC_LO14)
4067 { // these are generated by label+offset things
4068 struct relocation_info *pair = &relocs[i+1];
4069 if((pair->r_address & R_SCATTERED) || pair->r_type != PPC_RELOC_PAIR)
4070 barf("Invalid Mach-O file: "
4071 "PPC_RELOC_* not followed by PPC_RELOC_PAIR");
4073 if(scat->r_type == PPC_RELOC_LO16)
4075 word = ((unsigned short*) wordPtr)[1];
4076 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
4078 else if(scat->r_type == PPC_RELOC_LO14)
4080 barf("Unsupported Relocation: PPC_RELOC_LO14");
4081 word = ((unsigned short*) wordPtr)[1] & 0xFFFC;
4082 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
4084 else if(scat->r_type == PPC_RELOC_HI16)
4086 word = ((unsigned short*) wordPtr)[1] << 16;
4087 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF);
4089 else if(scat->r_type == PPC_RELOC_HA16)
4091 word = ((unsigned short*) wordPtr)[1] << 16;
4092 word += ((short)relocs[i+1].r_address & (short)0xFFFF);
4096 word += (unsigned long) relocateAddress(oc, nSections, sections, scat->r_value)
4103 continue; // ignore the others
4105 #ifdef powerpc_HOST_ARCH
4106 if(scat->r_type == GENERIC_RELOC_VANILLA
4107 || scat->r_type == PPC_RELOC_SECTDIFF)
4109 if(scat->r_type == GENERIC_RELOC_VANILLA
4110 || scat->r_type == GENERIC_RELOC_SECTDIFF)
4115 #ifdef powerpc_HOST_ARCH
4116 else if(scat->r_type == PPC_RELOC_LO16_SECTDIFF || scat->r_type == PPC_RELOC_LO16)
4118 ((unsigned short*) wordPtr)[1] = word & 0xFFFF;
4120 else if(scat->r_type == PPC_RELOC_HI16_SECTDIFF || scat->r_type == PPC_RELOC_HI16)
4122 ((unsigned short*) wordPtr)[1] = (word >> 16) & 0xFFFF;
4124 else if(scat->r_type == PPC_RELOC_HA16_SECTDIFF || scat->r_type == PPC_RELOC_HA16)
4126 ((unsigned short*) wordPtr)[1] = ((word >> 16) & 0xFFFF)
4127 + ((word & (1<<15)) ? 1 : 0);
4133 continue; // FIXME: I hope it's OK to ignore all the others.
4137 struct relocation_info *reloc = &relocs[i];
4138 if(reloc->r_pcrel && !reloc->r_extern)
4141 if(reloc->r_length == 2)
4143 unsigned long word = 0;
4144 #ifdef powerpc_HOST_ARCH
4145 unsigned long jumpIsland = 0;
4146 long offsetToJumpIsland = 0xBADBAD42; // initialise to bad value
4147 // to avoid warning and to catch
4151 unsigned long* wordPtr = (unsigned long*) (image + sect->offset + reloc->r_address);
4152 checkProddableBlock(oc,wordPtr);
4154 if(reloc->r_type == GENERIC_RELOC_VANILLA)
4158 #ifdef powerpc_HOST_ARCH
4159 else if(reloc->r_type == PPC_RELOC_LO16)
4161 word = ((unsigned short*) wordPtr)[1];
4162 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
4164 else if(reloc->r_type == PPC_RELOC_HI16)
4166 word = ((unsigned short*) wordPtr)[1] << 16;
4167 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF);
4169 else if(reloc->r_type == PPC_RELOC_HA16)
4171 word = ((unsigned short*) wordPtr)[1] << 16;
4172 word += ((short)relocs[i+1].r_address & (short)0xFFFF);
4174 else if(reloc->r_type == PPC_RELOC_BR24)
4177 word = (word & 0x03FFFFFC) | ((word & 0x02000000) ? 0xFC000000 : 0);
4181 if(!reloc->r_extern)
4184 sections[reloc->r_symbolnum-1].offset
4185 - sections[reloc->r_symbolnum-1].addr
4192 struct nlist *symbol = &nlist[reloc->r_symbolnum];
4193 char *nm = image + symLC->stroff + symbol->n_un.n_strx;
4194 void *symbolAddress = lookupSymbol(nm);
4197 errorBelch("\nunknown symbol `%s'", nm);
4203 #ifdef powerpc_HOST_ARCH
4204 // In the .o file, this should be a relative jump to NULL
4205 // and we'll change it to a relative jump to the symbol
4206 ASSERT(-word == reloc->r_address);
4207 jumpIsland = (unsigned long)
4208 &makeSymbolExtra(oc,
4210 (unsigned long) symbolAddress)
4214 offsetToJumpIsland = word + jumpIsland
4215 - (((long)image) + sect->offset - sect->addr);
4218 word += (unsigned long) symbolAddress
4219 - (((long)image) + sect->offset - sect->addr);
4223 word += (unsigned long) symbolAddress;
4227 if(reloc->r_type == GENERIC_RELOC_VANILLA)
4232 #ifdef powerpc_HOST_ARCH
4233 else if(reloc->r_type == PPC_RELOC_LO16)
4235 ((unsigned short*) wordPtr)[1] = word & 0xFFFF;
4238 else if(reloc->r_type == PPC_RELOC_HI16)
4240 ((unsigned short*) wordPtr)[1] = (word >> 16) & 0xFFFF;
4243 else if(reloc->r_type == PPC_RELOC_HA16)
4245 ((unsigned short*) wordPtr)[1] = ((word >> 16) & 0xFFFF)
4246 + ((word & (1<<15)) ? 1 : 0);
4249 else if(reloc->r_type == PPC_RELOC_BR24)
4251 if((long)word > (long)0x01FFFFFF || (long)word < (long)0xFFE00000)
4253 // The branch offset is too large.
4254 // Therefore, we try to use a jump island.
4257 barf("unconditional relative branch out of range: "
4258 "no jump island available");
4261 word = offsetToJumpIsland;
4262 if((long)word > (long)0x01FFFFFF || (long)word < (long)0xFFE00000)
4263 barf("unconditional relative branch out of range: "
4264 "jump island out of range");
4266 *wordPtr = (*wordPtr & 0xFC000003) | (word & 0x03FFFFFC);
4271 barf("\nunknown relocation %d",reloc->r_type);
4279 static int ocGetNames_MachO(ObjectCode* oc)
4281 char *image = (char*) oc->image;
4282 struct mach_header *header = (struct mach_header*) image;
4283 struct load_command *lc = (struct load_command*) (image + sizeof(struct mach_header));
4284 unsigned i,curSymbol = 0;
4285 struct segment_command *segLC = NULL;
4286 struct section *sections;
4287 struct symtab_command *symLC = NULL;
4288 struct nlist *nlist;
4289 unsigned long commonSize = 0;
4290 char *commonStorage = NULL;
4291 unsigned long commonCounter;
4293 for(i=0;i<header->ncmds;i++)
4295 if(lc->cmd == LC_SEGMENT || lc->cmd == LC_SEGMENT_64)
4296 segLC = (struct segment_command*) lc;
4297 else if(lc->cmd == LC_SYMTAB)
4298 symLC = (struct symtab_command*) lc;
4299 lc = (struct load_command *) ( ((char*)lc) + lc->cmdsize );
4302 sections = (struct section*) (segLC+1);
4303 nlist = symLC ? (struct nlist*) (image + symLC->symoff)
4307 barf("ocGetNames_MachO: no segment load command");
4309 for(i=0;i<segLC->nsects;i++)
4311 if(sections[i].size == 0)
4314 if((sections[i].flags & SECTION_TYPE) == S_ZEROFILL)
4316 char * zeroFillArea = stgCallocBytes(1,sections[i].size,
4317 "ocGetNames_MachO(common symbols)");
4318 sections[i].offset = zeroFillArea - image;
4321 if(!strcmp(sections[i].sectname,"__text"))
4322 addSection(oc, SECTIONKIND_CODE_OR_RODATA,
4323 (void*) (image + sections[i].offset),
4324 (void*) (image + sections[i].offset + sections[i].size));
4325 else if(!strcmp(sections[i].sectname,"__const"))
4326 addSection(oc, SECTIONKIND_RWDATA,
4327 (void*) (image + sections[i].offset),
4328 (void*) (image + sections[i].offset + sections[i].size));
4329 else if(!strcmp(sections[i].sectname,"__data"))
4330 addSection(oc, SECTIONKIND_RWDATA,
4331 (void*) (image + sections[i].offset),
4332 (void*) (image + sections[i].offset + sections[i].size));
4333 else if(!strcmp(sections[i].sectname,"__bss")
4334 || !strcmp(sections[i].sectname,"__common"))
4335 addSection(oc, SECTIONKIND_RWDATA,
4336 (void*) (image + sections[i].offset),
4337 (void*) (image + sections[i].offset + sections[i].size));
4339 addProddableBlock(oc, (void*) (image + sections[i].offset),
4343 // count external symbols defined here
4347 for(i=0;i<symLC->nsyms;i++)
4349 if(nlist[i].n_type & N_STAB)
4351 else if(nlist[i].n_type & N_EXT)
4353 if((nlist[i].n_type & N_TYPE) == N_UNDF
4354 && (nlist[i].n_value != 0))
4356 commonSize += nlist[i].n_value;
4359 else if((nlist[i].n_type & N_TYPE) == N_SECT)
4364 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
4365 "ocGetNames_MachO(oc->symbols)");
4369 for(i=0;i<symLC->nsyms;i++)
4371 if(nlist[i].n_type & N_STAB)
4373 else if((nlist[i].n_type & N_TYPE) == N_SECT)
4375 if(nlist[i].n_type & N_EXT)
4377 char *nm = image + symLC->stroff + nlist[i].n_un.n_strx;
4378 if((nlist[i].n_desc & N_WEAK_DEF) && lookupSymbol(nm))
4379 ; // weak definition, and we already have a definition
4382 ghciInsertStrHashTable(oc->fileName, symhash, nm,
4384 + sections[nlist[i].n_sect-1].offset
4385 - sections[nlist[i].n_sect-1].addr
4386 + nlist[i].n_value);
4387 oc->symbols[curSymbol++] = nm;
4394 commonStorage = stgCallocBytes(1,commonSize,"ocGetNames_MachO(common symbols)");
4395 commonCounter = (unsigned long)commonStorage;
4398 for(i=0;i<symLC->nsyms;i++)
4400 if((nlist[i].n_type & N_TYPE) == N_UNDF
4401 && (nlist[i].n_type & N_EXT) && (nlist[i].n_value != 0))
4403 char *nm = image + symLC->stroff + nlist[i].n_un.n_strx;
4404 unsigned long sz = nlist[i].n_value;
4406 nlist[i].n_value = commonCounter;
4408 ghciInsertStrHashTable(oc->fileName, symhash, nm,
4409 (void*)commonCounter);
4410 oc->symbols[curSymbol++] = nm;
4412 commonCounter += sz;
4419 static int ocResolve_MachO(ObjectCode* oc)
4421 char *image = (char*) oc->image;
4422 struct mach_header *header = (struct mach_header*) image;
4423 struct load_command *lc = (struct load_command*) (image + sizeof(struct mach_header));
4425 struct segment_command *segLC = NULL;
4426 struct section *sections;
4427 struct symtab_command *symLC = NULL;
4428 struct dysymtab_command *dsymLC = NULL;
4429 struct nlist *nlist;
4431 for(i=0;i<header->ncmds;i++)
4433 if(lc->cmd == LC_SEGMENT || lc->cmd == LC_SEGMENT_64)
4434 segLC = (struct segment_command*) lc;
4435 else if(lc->cmd == LC_SYMTAB)
4436 symLC = (struct symtab_command*) lc;
4437 else if(lc->cmd == LC_DYSYMTAB)
4438 dsymLC = (struct dysymtab_command*) lc;
4439 lc = (struct load_command *) ( ((char*)lc) + lc->cmdsize );
4442 sections = (struct section*) (segLC+1);
4443 nlist = symLC ? (struct nlist*) (image + symLC->symoff)
4448 unsigned long *indirectSyms
4449 = (unsigned long*) (image + dsymLC->indirectsymoff);
4451 for(i=0;i<segLC->nsects;i++)
4453 if( !strcmp(sections[i].sectname,"__la_symbol_ptr")
4454 || !strcmp(sections[i].sectname,"__la_sym_ptr2")
4455 || !strcmp(sections[i].sectname,"__la_sym_ptr3"))
4457 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4460 else if(!strcmp(sections[i].sectname,"__nl_symbol_ptr")
4461 || !strcmp(sections[i].sectname,"__pointers"))
4463 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4466 else if(!strcmp(sections[i].sectname,"__jump_table"))
4468 if(!resolveImports(oc,image,symLC,§ions[i],indirectSyms,nlist))
4474 for(i=0;i<segLC->nsects;i++)
4476 if(!relocateSection(oc,image,symLC,nlist,segLC->nsects,sections,§ions[i]))
4480 /* Free the local symbol table; we won't need it again. */
4481 freeHashTable(oc->lochash, NULL);
4484 #if defined (powerpc_HOST_ARCH)
4485 ocFlushInstructionCache( oc );
4491 #ifdef powerpc_HOST_ARCH
4493 * The Mach-O object format uses leading underscores. But not everywhere.
4494 * There is a small number of runtime support functions defined in
4495 * libcc_dynamic.a whose name does not have a leading underscore.
4496 * As a consequence, we can't get their address from C code.
4497 * We have to use inline assembler just to take the address of a function.
4501 static void machoInitSymbolsWithoutUnderscore()
4503 extern void* symbolsWithoutUnderscore[];
4504 void **p = symbolsWithoutUnderscore;
4505 __asm__ volatile(".globl _symbolsWithoutUnderscore\n.data\n_symbolsWithoutUnderscore:");
4509 __asm__ volatile(".long " # x);
4511 RTS_MACHO_NOUNDERLINE_SYMBOLS
4513 __asm__ volatile(".text");
4517 ghciInsertStrHashTable("(GHCi built-in symbols)", symhash, #x, *p++);
4519 RTS_MACHO_NOUNDERLINE_SYMBOLS
4526 * Figure out by how much to shift the entire Mach-O file in memory
4527 * when loading so that its single segment ends up 16-byte-aligned
4529 static int machoGetMisalignment( FILE * f )
4531 struct mach_header header;
4534 fread(&header, sizeof(header), 1, f);
4537 #if x86_64_TARGET_ARCH || powerpc64_TARGET_ARCH
4538 if(header.magic != MH_MAGIC_64)
4541 if(header.magic != MH_MAGIC)
4545 misalignment = (header.sizeofcmds + sizeof(header))
4548 return misalignment ? (16 - misalignment) : 0;