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"
30 #ifdef HAVE_SYS_TYPES_H
31 #include <sys/types.h>
37 #ifdef HAVE_SYS_STAT_H
41 #if defined(HAVE_DLFCN_H)
45 #if defined(cygwin32_HOST_OS)
50 #ifdef HAVE_SYS_TIME_H
54 #include <sys/fcntl.h>
55 #include <sys/termios.h>
56 #include <sys/utime.h>
57 #include <sys/utsname.h>
61 #if defined(ia64_HOST_ARCH) || defined(openbsd_HOST_OS) || defined(linux_HOST_OS) || defined(freebsd_HOST_OS)
66 #if defined(openbsd_HOST_OS) || defined(linux_HOST_OS) || defined(freebsd_HOST_OS)
74 #if defined(linux_HOST_OS) || defined(solaris2_HOST_OS) || defined(freebsd_HOST_OS) || defined(netbsd_HOST_OS) || defined(openbsd_HOST_OS)
75 # define OBJFORMAT_ELF
76 #elif defined(cygwin32_HOST_OS) || defined (mingw32_HOST_OS)
77 # define OBJFORMAT_PEi386
80 #elif defined(darwin_HOST_OS)
81 # define OBJFORMAT_MACHO
82 # include <mach-o/loader.h>
83 # include <mach-o/nlist.h>
84 # include <mach-o/reloc.h>
85 # include <mach-o/dyld.h>
86 #if defined(powerpc_HOST_ARCH)
87 # include <mach-o/ppc/reloc.h>
91 /* Hash table mapping symbol names to Symbol */
92 static /*Str*/HashTable *symhash;
94 /* List of currently loaded objects */
95 ObjectCode *objects = NULL; /* initially empty */
97 #if defined(OBJFORMAT_ELF)
98 static int ocVerifyImage_ELF ( ObjectCode* oc );
99 static int ocGetNames_ELF ( ObjectCode* oc );
100 static int ocResolve_ELF ( ObjectCode* oc );
101 #if defined(powerpc_HOST_ARCH)
102 static int ocAllocateJumpIslands_ELF ( ObjectCode* oc );
104 #elif defined(OBJFORMAT_PEi386)
105 static int ocVerifyImage_PEi386 ( ObjectCode* oc );
106 static int ocGetNames_PEi386 ( ObjectCode* oc );
107 static int ocResolve_PEi386 ( ObjectCode* oc );
108 #elif defined(OBJFORMAT_MACHO)
109 static int ocVerifyImage_MachO ( ObjectCode* oc );
110 static int ocGetNames_MachO ( ObjectCode* oc );
111 static int ocResolve_MachO ( ObjectCode* oc );
113 static int machoGetMisalignment( FILE * );
114 #ifdef powerpc_HOST_ARCH
115 static int ocAllocateJumpIslands_MachO ( ObjectCode* oc );
116 static void machoInitSymbolsWithoutUnderscore( void );
120 /* -----------------------------------------------------------------------------
121 * Built-in symbols from the RTS
124 typedef struct _RtsSymbolVal {
131 #define Maybe_ForeignObj SymX(mkForeignObjzh_fast)
133 #define Maybe_Stable_Names SymX(mkWeakzh_fast) \
134 SymX(makeStableNamezh_fast) \
135 SymX(finalizzeWeakzh_fast)
137 /* These are not available in GUM!!! -- HWL */
138 #define Maybe_ForeignObj
139 #define Maybe_Stable_Names
142 #if !defined (mingw32_HOST_OS)
143 #define RTS_POSIX_ONLY_SYMBOLS \
144 SymX(stg_sig_install) \
148 #if defined (cygwin32_HOST_OS)
149 #define RTS_MINGW_ONLY_SYMBOLS /**/
150 /* Don't have the ability to read import libs / archives, so
151 * we have to stupidly list a lot of what libcygwin.a
154 #define RTS_CYGWIN_ONLY_SYMBOLS \
232 #elif !defined(mingw32_HOST_OS)
233 #define RTS_MINGW_ONLY_SYMBOLS /**/
234 #define RTS_CYGWIN_ONLY_SYMBOLS /**/
235 #else /* defined(mingw32_HOST_OS) */
236 #define RTS_POSIX_ONLY_SYMBOLS /**/
237 #define RTS_CYGWIN_ONLY_SYMBOLS /**/
239 /* Extra syms gen'ed by mingw-2's gcc-3.2: */
241 #define RTS_MINGW_EXTRA_SYMS \
242 Sym(_imp____mb_cur_max) \
245 #define RTS_MINGW_EXTRA_SYMS
248 /* These are statically linked from the mingw libraries into the ghc
249 executable, so we have to employ this hack. */
250 #define RTS_MINGW_ONLY_SYMBOLS \
251 SymX(asyncReadzh_fast) \
252 SymX(asyncWritezh_fast) \
253 SymX(asyncDoProczh_fast) \
265 SymX(getservbyname) \
266 SymX(getservbyport) \
267 SymX(getprotobynumber) \
268 SymX(getprotobyname) \
269 SymX(gethostbyname) \
270 SymX(gethostbyaddr) \
304 SymX(rts_InstallConsoleEvent) \
305 SymX(rts_ConsoleHandlerDone) \
307 Sym(_imp___timezone) \
316 RTS_MINGW_EXTRA_SYMS \
321 # define MAIN_CAP_SYM SymX(MainCapability)
323 # define MAIN_CAP_SYM
326 #if !defined(mingw32_HOST_OS)
327 #define RTS_USER_SIGNALS_SYMBOLS \
328 SymX(startSignalHandler) \
329 SymX(setIOManagerPipe)
331 #define RTS_USER_SIGNALS_SYMBOLS /* nothing */
334 #ifdef TABLES_NEXT_TO_CODE
335 #define RTS_RET_SYMBOLS /* nothing */
337 #define RTS_RET_SYMBOLS \
338 SymX(stg_enter_ret) \
339 SymX(stg_gc_fun_ret) \
347 SymX(stg_ap_pv_ret) \
348 SymX(stg_ap_pp_ret) \
349 SymX(stg_ap_ppv_ret) \
350 SymX(stg_ap_ppp_ret) \
351 SymX(stg_ap_pppv_ret) \
352 SymX(stg_ap_pppp_ret) \
353 SymX(stg_ap_ppppp_ret) \
354 SymX(stg_ap_pppppp_ret)
357 #define RTS_SYMBOLS \
361 SymX(stg_enter_info) \
362 SymX(stg_gc_void_info) \
363 SymX(__stg_gc_enter_1) \
364 SymX(stg_gc_noregs) \
365 SymX(stg_gc_unpt_r1_info) \
366 SymX(stg_gc_unpt_r1) \
367 SymX(stg_gc_unbx_r1_info) \
368 SymX(stg_gc_unbx_r1) \
369 SymX(stg_gc_f1_info) \
371 SymX(stg_gc_d1_info) \
373 SymX(stg_gc_l1_info) \
376 SymX(stg_gc_fun_info) \
378 SymX(stg_gc_gen_info) \
379 SymX(stg_gc_gen_hp) \
381 SymX(stg_gen_yield) \
382 SymX(stg_yield_noregs) \
383 SymX(stg_yield_to_interpreter) \
384 SymX(stg_gen_block) \
385 SymX(stg_block_noregs) \
387 SymX(stg_block_takemvar) \
388 SymX(stg_block_putmvar) \
389 SymX(stg_seq_frame_info) \
391 SymX(MallocFailHook) \
393 SymX(OutOfHeapHook) \
394 SymX(StackOverflowHook) \
395 SymX(__encodeDouble) \
396 SymX(__encodeFloat) \
400 SymX(__gmpz_cmp_si) \
401 SymX(__gmpz_cmp_ui) \
402 SymX(__gmpz_get_si) \
403 SymX(__gmpz_get_ui) \
404 SymX(__int_encodeDouble) \
405 SymX(__int_encodeFloat) \
406 SymX(andIntegerzh_fast) \
407 SymX(atomicallyzh_fast) \
411 SymX(blockAsyncExceptionszh_fast) \
413 SymX(catchRetryzh_fast) \
414 SymX(catchSTMzh_fast) \
415 SymX(closure_flags) \
417 SymX(cmpIntegerzh_fast) \
418 SymX(cmpIntegerIntzh_fast) \
419 SymX(complementIntegerzh_fast) \
420 SymX(createAdjustor) \
421 SymX(decodeDoublezh_fast) \
422 SymX(decodeFloatzh_fast) \
425 SymX(deRefWeakzh_fast) \
426 SymX(deRefStablePtrzh_fast) \
427 SymX(divExactIntegerzh_fast) \
428 SymX(divModIntegerzh_fast) \
431 SymX(forkOS_createThread) \
432 SymX(freeHaskellFunctionPtr) \
433 SymX(freeStablePtr) \
434 SymX(gcdIntegerzh_fast) \
435 SymX(gcdIntegerIntzh_fast) \
436 SymX(gcdIntzh_fast) \
445 SymX(hs_perform_gc) \
446 SymX(hs_free_stable_ptr) \
447 SymX(hs_free_fun_ptr) \
449 SymX(int2Integerzh_fast) \
450 SymX(integer2Intzh_fast) \
451 SymX(integer2Wordzh_fast) \
452 SymX(isCurrentThreadBoundzh_fast) \
453 SymX(isDoubleDenormalized) \
454 SymX(isDoubleInfinite) \
456 SymX(isDoubleNegativeZero) \
457 SymX(isEmptyMVarzh_fast) \
458 SymX(isFloatDenormalized) \
459 SymX(isFloatInfinite) \
461 SymX(isFloatNegativeZero) \
462 SymX(killThreadzh_fast) \
465 SymX(makeStablePtrzh_fast) \
466 SymX(minusIntegerzh_fast) \
467 SymX(mkApUpd0zh_fast) \
468 SymX(myThreadIdzh_fast) \
469 SymX(labelThreadzh_fast) \
470 SymX(newArrayzh_fast) \
471 SymX(newBCOzh_fast) \
472 SymX(newByteArrayzh_fast) \
473 SymX_redirect(newCAF, newDynCAF) \
474 SymX(newMVarzh_fast) \
475 SymX(newMutVarzh_fast) \
476 SymX(newTVarzh_fast) \
477 SymX(atomicModifyMutVarzh_fast) \
478 SymX(newPinnedByteArrayzh_fast) \
479 SymX(orIntegerzh_fast) \
481 SymX(performMajorGC) \
482 SymX(plusIntegerzh_fast) \
485 SymX(putMVarzh_fast) \
486 SymX(quotIntegerzh_fast) \
487 SymX(quotRemIntegerzh_fast) \
489 SymX(raiseIOzh_fast) \
490 SymX(readTVarzh_fast) \
491 SymX(remIntegerzh_fast) \
492 SymX(resetNonBlockingFd) \
497 SymX(rts_checkSchedStatus) \
500 SymX(rts_evalLazyIO) \
501 SymX(rts_evalStableIO) \
505 SymX(rts_getDouble) \
510 SymX(rts_getFunPtr) \
511 SymX(rts_getStablePtr) \
512 SymX(rts_getThreadId) \
514 SymX(rts_getWord32) \
527 SymX(rts_mkStablePtr) \
535 SymX(rtsSupportsBoundThreads) \
537 SymX(__hscore_get_saved_termios) \
538 SymX(__hscore_set_saved_termios) \
540 SymX(startupHaskell) \
541 SymX(shutdownHaskell) \
542 SymX(shutdownHaskellAndExit) \
543 SymX(stable_ptr_table) \
544 SymX(stackOverflow) \
545 SymX(stg_CAF_BLACKHOLE_info) \
546 SymX(awakenBlockedQueue) \
547 SymX(stg_CHARLIKE_closure) \
548 SymX(stg_EMPTY_MVAR_info) \
549 SymX(stg_IND_STATIC_info) \
550 SymX(stg_INTLIKE_closure) \
551 SymX(stg_MUT_ARR_PTRS_FROZEN_info) \
552 SymX(stg_MUT_ARR_PTRS_FROZEN0_info) \
553 SymX(stg_WEAK_info) \
554 SymX(stg_ap_0_info) \
555 SymX(stg_ap_v_info) \
556 SymX(stg_ap_f_info) \
557 SymX(stg_ap_d_info) \
558 SymX(stg_ap_l_info) \
559 SymX(stg_ap_n_info) \
560 SymX(stg_ap_p_info) \
561 SymX(stg_ap_pv_info) \
562 SymX(stg_ap_pp_info) \
563 SymX(stg_ap_ppv_info) \
564 SymX(stg_ap_ppp_info) \
565 SymX(stg_ap_pppv_info) \
566 SymX(stg_ap_pppp_info) \
567 SymX(stg_ap_ppppp_info) \
568 SymX(stg_ap_pppppp_info) \
569 SymX(stg_ap_1_upd_info) \
570 SymX(stg_ap_2_upd_info) \
571 SymX(stg_ap_3_upd_info) \
572 SymX(stg_ap_4_upd_info) \
573 SymX(stg_ap_5_upd_info) \
574 SymX(stg_ap_6_upd_info) \
575 SymX(stg_ap_7_upd_info) \
577 SymX(stg_sel_0_upd_info) \
578 SymX(stg_sel_10_upd_info) \
579 SymX(stg_sel_11_upd_info) \
580 SymX(stg_sel_12_upd_info) \
581 SymX(stg_sel_13_upd_info) \
582 SymX(stg_sel_14_upd_info) \
583 SymX(stg_sel_15_upd_info) \
584 SymX(stg_sel_1_upd_info) \
585 SymX(stg_sel_2_upd_info) \
586 SymX(stg_sel_3_upd_info) \
587 SymX(stg_sel_4_upd_info) \
588 SymX(stg_sel_5_upd_info) \
589 SymX(stg_sel_6_upd_info) \
590 SymX(stg_sel_7_upd_info) \
591 SymX(stg_sel_8_upd_info) \
592 SymX(stg_sel_9_upd_info) \
593 SymX(stg_upd_frame_info) \
594 SymX(suspendThread) \
595 SymX(takeMVarzh_fast) \
596 SymX(timesIntegerzh_fast) \
597 SymX(tryPutMVarzh_fast) \
598 SymX(tryTakeMVarzh_fast) \
599 SymX(unblockAsyncExceptionszh_fast) \
601 SymX(unsafeThawArrayzh_fast) \
602 SymX(waitReadzh_fast) \
603 SymX(waitWritezh_fast) \
604 SymX(word2Integerzh_fast) \
605 SymX(writeTVarzh_fast) \
606 SymX(xorIntegerzh_fast) \
608 RTS_USER_SIGNALS_SYMBOLS
610 #ifdef SUPPORT_LONG_LONGS
611 #define RTS_LONG_LONG_SYMS \
612 SymX(int64ToIntegerzh_fast) \
613 SymX(word64ToIntegerzh_fast)
615 #define RTS_LONG_LONG_SYMS /* nothing */
618 // 64-bit support functions in libgcc.a
619 #if defined(__GNUC__) && SIZEOF_VOID_P <= 4
620 #define RTS_LIBGCC_SYMBOLS \
630 #elif defined(ia64_HOST_ARCH)
631 #define RTS_LIBGCC_SYMBOLS \
639 #define RTS_LIBGCC_SYMBOLS
642 #if defined(darwin_HOST_OS) && defined(powerpc_HOST_ARCH)
643 // Symbols that don't have a leading underscore
644 // on Mac OS X. They have to receive special treatment,
645 // see machoInitSymbolsWithoutUnderscore()
646 #define RTS_MACHO_NOUNDERLINE_SYMBOLS \
651 /* entirely bogus claims about types of these symbols */
652 #define Sym(vvv) extern void vvv(void);
653 #define SymX(vvv) /**/
654 #define SymX_redirect(vvv,xxx) /**/
658 RTS_POSIX_ONLY_SYMBOLS
659 RTS_MINGW_ONLY_SYMBOLS
660 RTS_CYGWIN_ONLY_SYMBOLS
666 #ifdef LEADING_UNDERSCORE
667 #define MAYBE_LEADING_UNDERSCORE_STR(s) ("_" s)
669 #define MAYBE_LEADING_UNDERSCORE_STR(s) (s)
672 #define Sym(vvv) { MAYBE_LEADING_UNDERSCORE_STR(#vvv), \
674 #define SymX(vvv) Sym(vvv)
676 // SymX_redirect allows us to redirect references to one symbol to
677 // another symbol. See newCAF/newDynCAF for an example.
678 #define SymX_redirect(vvv,xxx) \
679 { MAYBE_LEADING_UNDERSCORE_STR(#vvv), \
682 static RtsSymbolVal rtsSyms[] = {
686 RTS_POSIX_ONLY_SYMBOLS
687 RTS_MINGW_ONLY_SYMBOLS
688 RTS_CYGWIN_ONLY_SYMBOLS
690 #if defined(darwin_HOST_OS) && defined(i386_HOST_ARCH)
691 // dyld stub code contains references to this,
692 // but it should never be called because we treat
693 // lazy pointers as nonlazy.
694 { "dyld_stub_binding_helper", (void*)0xDEADBEEF },
696 { 0, 0 } /* sentinel */
699 /* -----------------------------------------------------------------------------
700 * Insert symbols into hash tables, checking for duplicates.
702 static void ghciInsertStrHashTable ( char* obj_name,
708 if (lookupHashTable(table, (StgWord)key) == NULL)
710 insertStrHashTable(table, (StgWord)key, data);
715 "GHCi runtime linker: fatal error: I found a duplicate definition for symbol\n"
717 "whilst processing object file\n"
719 "This could be caused by:\n"
720 " * Loading two different object files which export the same symbol\n"
721 " * Specifying the same object file twice on the GHCi command line\n"
722 " * An incorrect `package.conf' entry, causing some object to be\n"
724 "GHCi cannot safely continue in this situation. Exiting now. Sorry.\n"
733 /* -----------------------------------------------------------------------------
734 * initialize the object linker
738 static int linker_init_done = 0 ;
740 #if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
741 static void *dl_prog_handle;
744 /* dlopen(NULL,..) doesn't work so we grab libc explicitly */
745 #if defined(openbsd_HOST_OS)
746 static void *dl_libc_handle;
754 /* Make initLinker idempotent, so we can call it
755 before evey relevant operation; that means we
756 don't need to initialise the linker separately */
757 if (linker_init_done == 1) { return; } else {
758 linker_init_done = 1;
761 symhash = allocStrHashTable();
763 /* populate the symbol table with stuff from the RTS */
764 for (sym = rtsSyms; sym->lbl != NULL; sym++) {
765 ghciInsertStrHashTable("(GHCi built-in symbols)",
766 symhash, sym->lbl, sym->addr);
768 # if defined(OBJFORMAT_MACHO) && defined(powerpc_HOST_ARCH)
769 machoInitSymbolsWithoutUnderscore();
772 # if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
773 # if defined(RTLD_DEFAULT)
774 dl_prog_handle = RTLD_DEFAULT;
776 dl_prog_handle = dlopen(NULL, RTLD_LAZY);
777 # if defined(openbsd_HOST_OS)
778 dl_libc_handle = dlopen("libc.so", RTLD_LAZY);
780 # endif /* RTLD_DEFAULT */
784 /* -----------------------------------------------------------------------------
785 * Loading DLL or .so dynamic libraries
786 * -----------------------------------------------------------------------------
788 * Add a DLL from which symbols may be found. In the ELF case, just
789 * do RTLD_GLOBAL-style add, so no further messing around needs to
790 * happen in order that symbols in the loaded .so are findable --
791 * lookupSymbol() will subsequently see them by dlsym on the program's
792 * dl-handle. Returns NULL if success, otherwise ptr to an err msg.
794 * In the PEi386 case, open the DLLs and put handles to them in a
795 * linked list. When looking for a symbol, try all handles in the
796 * list. This means that we need to load even DLLs that are guaranteed
797 * to be in the ghc.exe image already, just so we can get a handle
798 * to give to loadSymbol, so that we can find the symbols. For such
799 * libraries, the LoadLibrary call should be a no-op except for returning
804 #if defined(OBJFORMAT_PEi386)
805 /* A record for storing handles into DLLs. */
810 struct _OpenedDLL* next;
815 /* A list thereof. */
816 static OpenedDLL* opened_dlls = NULL;
820 addDLL( char *dll_name )
822 # if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
823 /* ------------------- ELF DLL loader ------------------- */
829 hdl= dlopen(dll_name, RTLD_NOW | RTLD_GLOBAL);
832 /* dlopen failed; return a ptr to the error msg. */
834 if (errmsg == NULL) errmsg = "addDLL: unknown error";
841 # elif defined(OBJFORMAT_PEi386)
842 /* ------------------- Win32 DLL loader ------------------- */
850 /* debugBelch("\naddDLL; dll_name = `%s'\n", dll_name); */
852 /* See if we've already got it, and ignore if so. */
853 for (o_dll = opened_dlls; o_dll != NULL; o_dll = o_dll->next) {
854 if (0 == strcmp(o_dll->name, dll_name))
858 /* The file name has no suffix (yet) so that we can try
859 both foo.dll and foo.drv
861 The documentation for LoadLibrary says:
862 If no file name extension is specified in the lpFileName
863 parameter, the default library extension .dll is
864 appended. However, the file name string can include a trailing
865 point character (.) to indicate that the module name has no
868 buf = stgMallocBytes(strlen(dll_name) + 10, "addDLL");
869 sprintf(buf, "%s.DLL", dll_name);
870 instance = LoadLibrary(buf);
871 if (instance == NULL) {
872 sprintf(buf, "%s.DRV", dll_name); // KAA: allow loading of drivers (like winspool.drv)
873 instance = LoadLibrary(buf);
874 if (instance == NULL) {
877 /* LoadLibrary failed; return a ptr to the error msg. */
878 return "addDLL: unknown error";
883 /* Add this DLL to the list of DLLs in which to search for symbols. */
884 o_dll = stgMallocBytes( sizeof(OpenedDLL), "addDLL" );
885 o_dll->name = stgMallocBytes(1+strlen(dll_name), "addDLL");
886 strcpy(o_dll->name, dll_name);
887 o_dll->instance = instance;
888 o_dll->next = opened_dlls;
893 barf("addDLL: not implemented on this platform");
897 /* -----------------------------------------------------------------------------
898 * lookup a symbol in the hash table
901 lookupSymbol( char *lbl )
905 ASSERT(symhash != NULL);
906 val = lookupStrHashTable(symhash, lbl);
909 # if defined(OBJFORMAT_ELF)
910 # if defined(openbsd_HOST_OS)
911 val = dlsym(dl_prog_handle, lbl);
912 return (val != NULL) ? val : dlsym(dl_libc_handle,lbl);
913 # else /* not openbsd */
914 return dlsym(dl_prog_handle, lbl);
916 # elif defined(OBJFORMAT_MACHO)
917 if(NSIsSymbolNameDefined(lbl)) {
918 NSSymbol symbol = NSLookupAndBindSymbol(lbl);
919 return NSAddressOfSymbol(symbol);
923 # elif defined(OBJFORMAT_PEi386)
926 for (o_dll = opened_dlls; o_dll != NULL; o_dll = o_dll->next) {
927 /* debugBelch("look in %s for %s\n", o_dll->name, lbl); */
929 /* HACK: if the name has an initial underscore, try stripping
930 it off & look that up first. I've yet to verify whether there's
931 a Rule that governs whether an initial '_' *should always* be
932 stripped off when mapping from import lib name to the DLL name.
934 sym = GetProcAddress(o_dll->instance, (lbl+1));
936 /*debugBelch("found %s in %s\n", lbl+1,o_dll->name);*/
940 sym = GetProcAddress(o_dll->instance, lbl);
942 /*debugBelch("found %s in %s\n", lbl,o_dll->name);*/
957 __attribute((unused))
959 lookupLocalSymbol( ObjectCode* oc, char *lbl )
963 val = lookupStrHashTable(oc->lochash, lbl);
973 /* -----------------------------------------------------------------------------
974 * Debugging aid: look in GHCi's object symbol tables for symbols
975 * within DELTA bytes of the specified address, and show their names.
978 void ghci_enquire ( char* addr );
980 void ghci_enquire ( char* addr )
985 const int DELTA = 64;
990 for (oc = objects; oc; oc = oc->next) {
991 for (i = 0; i < oc->n_symbols; i++) {
992 sym = oc->symbols[i];
993 if (sym == NULL) continue;
994 // debugBelch("enquire %p %p\n", sym, oc->lochash);
996 if (oc->lochash != NULL) {
997 a = lookupStrHashTable(oc->lochash, sym);
1000 a = lookupStrHashTable(symhash, sym);
1003 // debugBelch("ghci_enquire: can't find %s\n", sym);
1005 else if (addr-DELTA <= a && a <= addr+DELTA) {
1006 debugBelch("%p + %3d == `%s'\n", addr, a - addr, sym);
1013 #ifdef ia64_HOST_ARCH
1014 static unsigned int PLTSize(void);
1017 /* -----------------------------------------------------------------------------
1018 * Load an obj (populate the global symbol table, but don't resolve yet)
1020 * Returns: 1 if ok, 0 on error.
1023 loadObj( char *path )
1030 void *map_addr = NULL;
1037 /* debugBelch("loadObj %s\n", path ); */
1039 /* Check that we haven't already loaded this object.
1040 Ignore requests to load multiple times */
1044 for (o = objects; o; o = o->next) {
1045 if (0 == strcmp(o->fileName, path)) {
1047 break; /* don't need to search further */
1051 IF_DEBUG(linker, debugBelch(
1052 "GHCi runtime linker: warning: looks like you're trying to load the\n"
1053 "same object file twice:\n"
1055 "GHCi will ignore this, but be warned.\n"
1057 return 1; /* success */
1061 oc = stgMallocBytes(sizeof(ObjectCode), "loadObj(oc)");
1063 # if defined(OBJFORMAT_ELF)
1064 oc->formatName = "ELF";
1065 # elif defined(OBJFORMAT_PEi386)
1066 oc->formatName = "PEi386";
1067 # elif defined(OBJFORMAT_MACHO)
1068 oc->formatName = "Mach-O";
1071 barf("loadObj: not implemented on this platform");
1074 r = stat(path, &st);
1075 if (r == -1) { return 0; }
1077 /* sigh, strdup() isn't a POSIX function, so do it the long way */
1078 oc->fileName = stgMallocBytes( strlen(path)+1, "loadObj" );
1079 strcpy(oc->fileName, path);
1081 oc->fileSize = st.st_size;
1083 oc->sections = NULL;
1084 oc->lochash = allocStrHashTable();
1085 oc->proddables = NULL;
1087 /* chain it onto the list of objects */
1092 #define ROUND_UP(x,size) ((x + size - 1) & ~(size - 1))
1094 /* On many architectures malloc'd memory isn't executable, so we need to use mmap. */
1096 #if defined(openbsd_HOST_OS)
1097 fd = open(path, O_RDONLY, S_IRUSR);
1099 fd = open(path, O_RDONLY);
1102 barf("loadObj: can't open `%s'", path);
1104 pagesize = getpagesize();
1106 #ifdef ia64_HOST_ARCH
1107 /* The PLT needs to be right before the object */
1108 n = ROUND_UP(PLTSize(), pagesize);
1109 oc->plt = mmap(NULL, n, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
1110 if (oc->plt == MAP_FAILED)
1111 barf("loadObj: can't allocate PLT");
1114 map_addr = oc->plt + n;
1117 n = ROUND_UP(oc->fileSize, pagesize);
1119 /* Link objects into the lower 2Gb on x86_64. GHC assumes the
1120 * small memory model on this architecture (see gcc docs,
1123 #ifdef x86_64_HOST_ARCH
1124 #define EXTRA_MAP_FLAGS MAP_32BIT
1126 #define EXTRA_MAP_FLAGS 0
1129 oc->image = mmap(map_addr, n, PROT_EXEC|PROT_READ|PROT_WRITE,
1130 MAP_PRIVATE|EXTRA_MAP_FLAGS, fd, 0);
1131 if (oc->image == MAP_FAILED)
1132 barf("loadObj: can't map `%s'", path);
1136 #else /* !USE_MMAP */
1138 /* load the image into memory */
1139 f = fopen(path, "rb");
1141 barf("loadObj: can't read `%s'", path);
1143 #ifdef darwin_HOST_OS
1144 // In a Mach-O .o file, all sections can and will be misaligned
1145 // if the total size of the headers is not a multiple of the
1146 // desired alignment. This is fine for .o files that only serve
1147 // as input for the static linker, but it's not fine for us,
1148 // as SSE (used by gcc for floating point) and Altivec require
1149 // 16-byte alignment.
1150 // We calculate the correct alignment from the header before
1151 // reading the file, and then we misalign oc->image on purpose so
1152 // that the actual sections end up aligned again.
1153 misalignment = machoGetMisalignment(f);
1158 oc->image = stgMallocBytes(oc->fileSize + misalignment, "loadObj(image)");
1159 oc->image += misalignment;
1161 n = fread ( oc->image, 1, oc->fileSize, f );
1162 if (n != oc->fileSize)
1163 barf("loadObj: error whilst reading `%s'", path);
1167 #endif /* USE_MMAP */
1169 # if defined(OBJFORMAT_MACHO) && defined(powerpc_HOST_ARCH)
1170 r = ocAllocateJumpIslands_MachO ( oc );
1171 if (!r) { return r; }
1172 # elif defined(OBJFORMAT_ELF) && defined(powerpc_HOST_ARCH)
1173 r = ocAllocateJumpIslands_ELF ( oc );
1174 if (!r) { return r; }
1177 /* verify the in-memory image */
1178 # if defined(OBJFORMAT_ELF)
1179 r = ocVerifyImage_ELF ( oc );
1180 # elif defined(OBJFORMAT_PEi386)
1181 r = ocVerifyImage_PEi386 ( oc );
1182 # elif defined(OBJFORMAT_MACHO)
1183 r = ocVerifyImage_MachO ( oc );
1185 barf("loadObj: no verify method");
1187 if (!r) { return r; }
1189 /* build the symbol list for this image */
1190 # if defined(OBJFORMAT_ELF)
1191 r = ocGetNames_ELF ( oc );
1192 # elif defined(OBJFORMAT_PEi386)
1193 r = ocGetNames_PEi386 ( oc );
1194 # elif defined(OBJFORMAT_MACHO)
1195 r = ocGetNames_MachO ( oc );
1197 barf("loadObj: no getNames method");
1199 if (!r) { return r; }
1201 /* loaded, but not resolved yet */
1202 oc->status = OBJECT_LOADED;
1207 /* -----------------------------------------------------------------------------
1208 * resolve all the currently unlinked objects in memory
1210 * Returns: 1 if ok, 0 on error.
1220 for (oc = objects; oc; oc = oc->next) {
1221 if (oc->status != OBJECT_RESOLVED) {
1222 # if defined(OBJFORMAT_ELF)
1223 r = ocResolve_ELF ( oc );
1224 # elif defined(OBJFORMAT_PEi386)
1225 r = ocResolve_PEi386 ( oc );
1226 # elif defined(OBJFORMAT_MACHO)
1227 r = ocResolve_MachO ( oc );
1229 barf("resolveObjs: not implemented on this platform");
1231 if (!r) { return r; }
1232 oc->status = OBJECT_RESOLVED;
1238 /* -----------------------------------------------------------------------------
1239 * delete an object from the pool
1242 unloadObj( char *path )
1244 ObjectCode *oc, *prev;
1246 ASSERT(symhash != NULL);
1247 ASSERT(objects != NULL);
1252 for (oc = objects; oc; prev = oc, oc = oc->next) {
1253 if (!strcmp(oc->fileName,path)) {
1255 /* Remove all the mappings for the symbols within this
1260 for (i = 0; i < oc->n_symbols; i++) {
1261 if (oc->symbols[i] != NULL) {
1262 removeStrHashTable(symhash, oc->symbols[i], NULL);
1270 prev->next = oc->next;
1273 /* We're going to leave this in place, in case there are
1274 any pointers from the heap into it: */
1275 /* stgFree(oc->image); */
1276 stgFree(oc->fileName);
1277 stgFree(oc->symbols);
1278 stgFree(oc->sections);
1279 /* The local hash table should have been freed at the end
1280 of the ocResolve_ call on it. */
1281 ASSERT(oc->lochash == NULL);
1287 errorBelch("unloadObj: can't find `%s' to unload", path);
1291 /* -----------------------------------------------------------------------------
1292 * Sanity checking. For each ObjectCode, maintain a list of address ranges
1293 * which may be prodded during relocation, and abort if we try and write
1294 * outside any of these.
1296 static void addProddableBlock ( ObjectCode* oc, void* start, int size )
1299 = stgMallocBytes(sizeof(ProddableBlock), "addProddableBlock");
1300 /* debugBelch("aPB %p %p %d\n", oc, start, size); */
1304 pb->next = oc->proddables;
1305 oc->proddables = pb;
1308 static void checkProddableBlock ( ObjectCode* oc, void* addr )
1311 for (pb = oc->proddables; pb != NULL; pb = pb->next) {
1312 char* s = (char*)(pb->start);
1313 char* e = s + pb->size - 1;
1314 char* a = (char*)addr;
1315 /* Assumes that the biggest fixup involves a 4-byte write. This
1316 probably needs to be changed to 8 (ie, +7) on 64-bit
1318 if (a >= s && (a+3) <= e) return;
1320 barf("checkProddableBlock: invalid fixup in runtime linker");
1323 /* -----------------------------------------------------------------------------
1324 * Section management.
1326 static void addSection ( ObjectCode* oc, SectionKind kind,
1327 void* start, void* end )
1329 Section* s = stgMallocBytes(sizeof(Section), "addSection");
1333 s->next = oc->sections;
1336 debugBelch("addSection: %p-%p (size %d), kind %d\n",
1337 start, ((char*)end)-1, end - start + 1, kind );
1342 /* --------------------------------------------------------------------------
1343 * PowerPC specifics (jump islands)
1344 * ------------------------------------------------------------------------*/
1346 #if defined(powerpc_HOST_ARCH)
1349 ocAllocateJumpIslands
1351 Allocate additional space at the end of the object file image to make room
1354 PowerPC relative branch instructions have a 24 bit displacement field.
1355 As PPC code is always 4-byte-aligned, this yields a +-32MB range.
1356 If a particular imported symbol is outside this range, we have to redirect
1357 the jump to a short piece of new code that just loads the 32bit absolute
1358 address and jumps there.
1359 This function just allocates space for one 16 byte ppcJumpIsland for every
1360 undefined symbol in the object file. The code for the islands is filled in by
1361 makeJumpIsland below.
1364 static int ocAllocateJumpIslands( ObjectCode* oc, int count, int first )
1373 // round up to the nearest 4
1374 aligned = (oc->fileSize + 3) & ~3;
1377 #ifndef linux_HOST_OS /* mremap is a linux extension */
1378 #error ocAllocateJumpIslands doesnt want USE_MMAP to be defined
1381 pagesize = getpagesize();
1382 n = ROUND_UP( oc->fileSize, pagesize );
1383 m = ROUND_UP( aligned + sizeof (ppcJumpIsland) * count, pagesize );
1385 /* The effect of this mremap() call is only the ensure that we have
1386 * a sufficient number of virtually contiguous pages. As returned from
1387 * mremap, the pages past the end of the file are not backed. We give
1388 * them a backing by using MAP_FIXED to map in anonymous pages.
1390 if( (oc->image = mremap( oc->image, n, m, MREMAP_MAYMOVE )) == MAP_FAILED )
1392 errorBelch( "Unable to mremap for Jump Islands\n" );
1396 if( mmap( oc->image + n, m - n, PROT_READ | PROT_WRITE | PROT_EXEC,
1397 MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED, 0, 0 ) == MAP_FAILED )
1399 errorBelch( "Unable to mmap( MAP_FIXED ) for Jump Islands\n" );
1404 oc->image = stgReallocBytes( oc->image,
1405 aligned + sizeof (ppcJumpIsland) * count,
1406 "ocAllocateJumpIslands" );
1407 #endif /* USE_MMAP */
1409 oc->jump_islands = (ppcJumpIsland *) (oc->image + aligned);
1410 memset( oc->jump_islands, 0, sizeof (ppcJumpIsland) * count );
1413 oc->jump_islands = NULL;
1415 oc->island_start_symbol = first;
1416 oc->n_islands = count;
1421 static unsigned long makeJumpIsland( ObjectCode* oc,
1422 unsigned long symbolNumber,
1423 unsigned long target )
1425 ppcJumpIsland *island;
1427 if( symbolNumber < oc->island_start_symbol ||
1428 symbolNumber - oc->island_start_symbol > oc->n_islands)
1431 island = &oc->jump_islands[symbolNumber - oc->island_start_symbol];
1433 // lis r12, hi16(target)
1434 island->lis_r12 = 0x3d80;
1435 island->hi_addr = target >> 16;
1437 // ori r12, r12, lo16(target)
1438 island->ori_r12_r12 = 0x618c;
1439 island->lo_addr = target & 0xffff;
1442 island->mtctr_r12 = 0x7d8903a6;
1445 island->bctr = 0x4e800420;
1447 return (unsigned long) island;
1451 ocFlushInstructionCache
1453 Flush the data & instruction caches.
1454 Because the PPC has split data/instruction caches, we have to
1455 do that whenever we modify code at runtime.
1458 static void ocFlushInstructionCache( ObjectCode *oc )
1460 int n = (oc->fileSize + sizeof( ppcJumpIsland ) * oc->n_islands + 3) / 4;
1461 unsigned long *p = (unsigned long *) oc->image;
1465 __asm__ volatile ( "dcbf 0,%0\n\t"
1473 __asm__ volatile ( "sync\n\t"
1479 /* --------------------------------------------------------------------------
1480 * PEi386 specifics (Win32 targets)
1481 * ------------------------------------------------------------------------*/
1483 /* The information for this linker comes from
1484 Microsoft Portable Executable
1485 and Common Object File Format Specification
1486 revision 5.1 January 1998
1487 which SimonM says comes from the MS Developer Network CDs.
1489 It can be found there (on older CDs), but can also be found
1492 http://www.microsoft.com/hwdev/hardware/PECOFF.asp
1494 (this is Rev 6.0 from February 1999).
1496 Things move, so if that fails, try searching for it via
1498 http://www.google.com/search?q=PE+COFF+specification
1500 The ultimate reference for the PE format is the Winnt.h
1501 header file that comes with the Platform SDKs; as always,
1502 implementations will drift wrt their documentation.
1504 A good background article on the PE format is Matt Pietrek's
1505 March 1994 article in Microsoft System Journal (MSJ)
1506 (Vol.9, No. 3): "Peering Inside the PE: A Tour of the
1507 Win32 Portable Executable File Format." The info in there
1508 has recently been updated in a two part article in
1509 MSDN magazine, issues Feb and March 2002,
1510 "Inside Windows: An In-Depth Look into the Win32 Portable
1511 Executable File Format"
1513 John Levine's book "Linkers and Loaders" contains useful
1518 #if defined(OBJFORMAT_PEi386)
1522 typedef unsigned char UChar;
1523 typedef unsigned short UInt16;
1524 typedef unsigned int UInt32;
1531 UInt16 NumberOfSections;
1532 UInt32 TimeDateStamp;
1533 UInt32 PointerToSymbolTable;
1534 UInt32 NumberOfSymbols;
1535 UInt16 SizeOfOptionalHeader;
1536 UInt16 Characteristics;
1540 #define sizeof_COFF_header 20
1547 UInt32 VirtualAddress;
1548 UInt32 SizeOfRawData;
1549 UInt32 PointerToRawData;
1550 UInt32 PointerToRelocations;
1551 UInt32 PointerToLinenumbers;
1552 UInt16 NumberOfRelocations;
1553 UInt16 NumberOfLineNumbers;
1554 UInt32 Characteristics;
1558 #define sizeof_COFF_section 40
1565 UInt16 SectionNumber;
1568 UChar NumberOfAuxSymbols;
1572 #define sizeof_COFF_symbol 18
1577 UInt32 VirtualAddress;
1578 UInt32 SymbolTableIndex;
1583 #define sizeof_COFF_reloc 10
1586 /* From PE spec doc, section 3.3.2 */
1587 /* Note use of MYIMAGE_* since IMAGE_* are already defined in
1588 windows.h -- for the same purpose, but I want to know what I'm
1590 #define MYIMAGE_FILE_RELOCS_STRIPPED 0x0001
1591 #define MYIMAGE_FILE_EXECUTABLE_IMAGE 0x0002
1592 #define MYIMAGE_FILE_DLL 0x2000
1593 #define MYIMAGE_FILE_SYSTEM 0x1000
1594 #define MYIMAGE_FILE_BYTES_REVERSED_HI 0x8000
1595 #define MYIMAGE_FILE_BYTES_REVERSED_LO 0x0080
1596 #define MYIMAGE_FILE_32BIT_MACHINE 0x0100
1598 /* From PE spec doc, section 5.4.2 and 5.4.4 */
1599 #define MYIMAGE_SYM_CLASS_EXTERNAL 2
1600 #define MYIMAGE_SYM_CLASS_STATIC 3
1601 #define MYIMAGE_SYM_UNDEFINED 0
1603 /* From PE spec doc, section 4.1 */
1604 #define MYIMAGE_SCN_CNT_CODE 0x00000020
1605 #define MYIMAGE_SCN_CNT_INITIALIZED_DATA 0x00000040
1606 #define MYIMAGE_SCN_LNK_NRELOC_OVFL 0x01000000
1608 /* From PE spec doc, section 5.2.1 */
1609 #define MYIMAGE_REL_I386_DIR32 0x0006
1610 #define MYIMAGE_REL_I386_REL32 0x0014
1613 /* We use myindex to calculate array addresses, rather than
1614 simply doing the normal subscript thing. That's because
1615 some of the above structs have sizes which are not
1616 a whole number of words. GCC rounds their sizes up to a
1617 whole number of words, which means that the address calcs
1618 arising from using normal C indexing or pointer arithmetic
1619 are just plain wrong. Sigh.
1622 myindex ( int scale, void* base, int index )
1625 ((UChar*)base) + scale * index;
1630 printName ( UChar* name, UChar* strtab )
1632 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
1633 UInt32 strtab_offset = * (UInt32*)(name+4);
1634 debugBelch("%s", strtab + strtab_offset );
1637 for (i = 0; i < 8; i++) {
1638 if (name[i] == 0) break;
1639 debugBelch("%c", name[i] );
1646 copyName ( UChar* name, UChar* strtab, UChar* dst, int dstSize )
1648 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
1649 UInt32 strtab_offset = * (UInt32*)(name+4);
1650 strncpy ( dst, strtab+strtab_offset, dstSize );
1656 if (name[i] == 0) break;
1666 cstring_from_COFF_symbol_name ( UChar* name, UChar* strtab )
1669 /* If the string is longer than 8 bytes, look in the
1670 string table for it -- this will be correctly zero terminated.
1672 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
1673 UInt32 strtab_offset = * (UInt32*)(name+4);
1674 return ((UChar*)strtab) + strtab_offset;
1676 /* Otherwise, if shorter than 8 bytes, return the original,
1677 which by defn is correctly terminated.
1679 if (name[7]==0) return name;
1680 /* The annoying case: 8 bytes. Copy into a temporary
1681 (which is never freed ...)
1683 newstr = stgMallocBytes(9, "cstring_from_COFF_symbol_name");
1685 strncpy(newstr,name,8);
1691 /* Just compares the short names (first 8 chars) */
1692 static COFF_section *
1693 findPEi386SectionCalled ( ObjectCode* oc, char* name )
1697 = (COFF_header*)(oc->image);
1698 COFF_section* sectab
1700 ((UChar*)(oc->image))
1701 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
1703 for (i = 0; i < hdr->NumberOfSections; i++) {
1706 COFF_section* section_i
1708 myindex ( sizeof_COFF_section, sectab, i );
1709 n1 = (UChar*) &(section_i->Name);
1711 if (n1[0]==n2[0] && n1[1]==n2[1] && n1[2]==n2[2] &&
1712 n1[3]==n2[3] && n1[4]==n2[4] && n1[5]==n2[5] &&
1713 n1[6]==n2[6] && n1[7]==n2[7])
1722 zapTrailingAtSign ( UChar* sym )
1724 # define my_isdigit(c) ((c) >= '0' && (c) <= '9')
1726 if (sym[0] == 0) return;
1728 while (sym[i] != 0) i++;
1731 while (j > 0 && my_isdigit(sym[j])) j--;
1732 if (j > 0 && sym[j] == '@' && j != i) sym[j] = 0;
1738 ocVerifyImage_PEi386 ( ObjectCode* oc )
1743 COFF_section* sectab;
1744 COFF_symbol* symtab;
1746 /* debugBelch("\nLOADING %s\n", oc->fileName); */
1747 hdr = (COFF_header*)(oc->image);
1748 sectab = (COFF_section*) (
1749 ((UChar*)(oc->image))
1750 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
1752 symtab = (COFF_symbol*) (
1753 ((UChar*)(oc->image))
1754 + hdr->PointerToSymbolTable
1756 strtab = ((UChar*)symtab)
1757 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
1759 if (hdr->Machine != 0x14c) {
1760 errorBelch("%s: Not x86 PEi386", oc->fileName);
1763 if (hdr->SizeOfOptionalHeader != 0) {
1764 errorBelch("%s: PEi386 with nonempty optional header", oc->fileName);
1767 if ( /* (hdr->Characteristics & MYIMAGE_FILE_RELOCS_STRIPPED) || */
1768 (hdr->Characteristics & MYIMAGE_FILE_EXECUTABLE_IMAGE) ||
1769 (hdr->Characteristics & MYIMAGE_FILE_DLL) ||
1770 (hdr->Characteristics & MYIMAGE_FILE_SYSTEM) ) {
1771 errorBelch("%s: Not a PEi386 object file", oc->fileName);
1774 if ( (hdr->Characteristics & MYIMAGE_FILE_BYTES_REVERSED_HI)
1775 /* || !(hdr->Characteristics & MYIMAGE_FILE_32BIT_MACHINE) */ ) {
1776 errorBelch("%s: Invalid PEi386 word size or endiannness: %d",
1778 (int)(hdr->Characteristics));
1781 /* If the string table size is way crazy, this might indicate that
1782 there are more than 64k relocations, despite claims to the
1783 contrary. Hence this test. */
1784 /* debugBelch("strtab size %d\n", * (UInt32*)strtab); */
1786 if ( (*(UInt32*)strtab) > 600000 ) {
1787 /* Note that 600k has no special significance other than being
1788 big enough to handle the almost-2MB-sized lumps that
1789 constitute HSwin32*.o. */
1790 debugBelch("PEi386 object has suspiciously large string table; > 64k relocs?");
1795 /* No further verification after this point; only debug printing. */
1797 IF_DEBUG(linker, i=1);
1798 if (i == 0) return 1;
1800 debugBelch( "sectab offset = %d\n", ((UChar*)sectab) - ((UChar*)hdr) );
1801 debugBelch( "symtab offset = %d\n", ((UChar*)symtab) - ((UChar*)hdr) );
1802 debugBelch( "strtab offset = %d\n", ((UChar*)strtab) - ((UChar*)hdr) );
1805 debugBelch( "Machine: 0x%x\n", (UInt32)(hdr->Machine) );
1806 debugBelch( "# sections: %d\n", (UInt32)(hdr->NumberOfSections) );
1807 debugBelch( "time/date: 0x%x\n", (UInt32)(hdr->TimeDateStamp) );
1808 debugBelch( "symtab offset: %d\n", (UInt32)(hdr->PointerToSymbolTable) );
1809 debugBelch( "# symbols: %d\n", (UInt32)(hdr->NumberOfSymbols) );
1810 debugBelch( "sz of opt hdr: %d\n", (UInt32)(hdr->SizeOfOptionalHeader) );
1811 debugBelch( "characteristics: 0x%x\n", (UInt32)(hdr->Characteristics) );
1813 /* Print the section table. */
1815 for (i = 0; i < hdr->NumberOfSections; i++) {
1817 COFF_section* sectab_i
1819 myindex ( sizeof_COFF_section, sectab, i );
1826 printName ( sectab_i->Name, strtab );
1836 sectab_i->VirtualSize,
1837 sectab_i->VirtualAddress,
1838 sectab_i->SizeOfRawData,
1839 sectab_i->PointerToRawData,
1840 sectab_i->NumberOfRelocations,
1841 sectab_i->PointerToRelocations,
1842 sectab_i->PointerToRawData
1844 reltab = (COFF_reloc*) (
1845 ((UChar*)(oc->image)) + sectab_i->PointerToRelocations
1848 if ( sectab_i->Characteristics & MYIMAGE_SCN_LNK_NRELOC_OVFL ) {
1849 /* If the relocation field (a short) has overflowed, the
1850 * real count can be found in the first reloc entry.
1852 * See Section 4.1 (last para) of the PE spec (rev6.0).
1854 COFF_reloc* rel = (COFF_reloc*)
1855 myindex ( sizeof_COFF_reloc, reltab, 0 );
1856 noRelocs = rel->VirtualAddress;
1859 noRelocs = sectab_i->NumberOfRelocations;
1863 for (; j < noRelocs; j++) {
1865 COFF_reloc* rel = (COFF_reloc*)
1866 myindex ( sizeof_COFF_reloc, reltab, j );
1868 " type 0x%-4x vaddr 0x%-8x name `",
1870 rel->VirtualAddress );
1871 sym = (COFF_symbol*)
1872 myindex ( sizeof_COFF_symbol, symtab, rel->SymbolTableIndex );
1873 /* Hmm..mysterious looking offset - what's it for? SOF */
1874 printName ( sym->Name, strtab -10 );
1881 debugBelch("string table has size 0x%x\n", * (UInt32*)strtab );
1882 debugBelch("---START of string table---\n");
1883 for (i = 4; i < *(Int32*)strtab; i++) {
1885 debugBelch("\n"); else
1886 debugBelch("%c", strtab[i] );
1888 debugBelch("--- END of string table---\n");
1893 COFF_symbol* symtab_i;
1894 if (i >= (Int32)(hdr->NumberOfSymbols)) break;
1895 symtab_i = (COFF_symbol*)
1896 myindex ( sizeof_COFF_symbol, symtab, i );
1902 printName ( symtab_i->Name, strtab );
1911 (Int32)(symtab_i->SectionNumber),
1912 (UInt32)symtab_i->Type,
1913 (UInt32)symtab_i->StorageClass,
1914 (UInt32)symtab_i->NumberOfAuxSymbols
1916 i += symtab_i->NumberOfAuxSymbols;
1926 ocGetNames_PEi386 ( ObjectCode* oc )
1929 COFF_section* sectab;
1930 COFF_symbol* symtab;
1937 hdr = (COFF_header*)(oc->image);
1938 sectab = (COFF_section*) (
1939 ((UChar*)(oc->image))
1940 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
1942 symtab = (COFF_symbol*) (
1943 ((UChar*)(oc->image))
1944 + hdr->PointerToSymbolTable
1946 strtab = ((UChar*)(oc->image))
1947 + hdr->PointerToSymbolTable
1948 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
1950 /* Allocate space for any (local, anonymous) .bss sections. */
1952 for (i = 0; i < hdr->NumberOfSections; i++) {
1954 COFF_section* sectab_i
1956 myindex ( sizeof_COFF_section, sectab, i );
1957 if (0 != strcmp(sectab_i->Name, ".bss")) continue;
1958 if (sectab_i->VirtualSize == 0) continue;
1959 /* This is a non-empty .bss section. Allocate zeroed space for
1960 it, and set its PointerToRawData field such that oc->image +
1961 PointerToRawData == addr_of_zeroed_space. */
1962 zspace = stgCallocBytes(1, sectab_i->VirtualSize,
1963 "ocGetNames_PEi386(anonymous bss)");
1964 sectab_i->PointerToRawData = ((UChar*)zspace) - ((UChar*)(oc->image));
1965 addProddableBlock(oc, zspace, sectab_i->VirtualSize);
1966 /* debugBelch("BSS anon section at 0x%x\n", zspace); */
1969 /* Copy section information into the ObjectCode. */
1971 for (i = 0; i < hdr->NumberOfSections; i++) {
1977 = SECTIONKIND_OTHER;
1978 COFF_section* sectab_i
1980 myindex ( sizeof_COFF_section, sectab, i );
1981 IF_DEBUG(linker, debugBelch("section name = %s\n", sectab_i->Name ));
1984 /* I'm sure this is the Right Way to do it. However, the
1985 alternative of testing the sectab_i->Name field seems to
1986 work ok with Cygwin.
1988 if (sectab_i->Characteristics & MYIMAGE_SCN_CNT_CODE ||
1989 sectab_i->Characteristics & MYIMAGE_SCN_CNT_INITIALIZED_DATA)
1990 kind = SECTIONKIND_CODE_OR_RODATA;
1993 if (0==strcmp(".text",sectab_i->Name) ||
1994 0==strcmp(".rdata",sectab_i->Name)||
1995 0==strcmp(".rodata",sectab_i->Name))
1996 kind = SECTIONKIND_CODE_OR_RODATA;
1997 if (0==strcmp(".data",sectab_i->Name) ||
1998 0==strcmp(".bss",sectab_i->Name))
1999 kind = SECTIONKIND_RWDATA;
2001 ASSERT(sectab_i->SizeOfRawData == 0 || sectab_i->VirtualSize == 0);
2002 sz = sectab_i->SizeOfRawData;
2003 if (sz < sectab_i->VirtualSize) sz = sectab_i->VirtualSize;
2005 start = ((UChar*)(oc->image)) + sectab_i->PointerToRawData;
2006 end = start + sz - 1;
2008 if (kind == SECTIONKIND_OTHER
2009 /* Ignore sections called which contain stabs debugging
2011 && 0 != strcmp(".stab", sectab_i->Name)
2012 && 0 != strcmp(".stabstr", sectab_i->Name)
2013 /* ignore constructor section for now */
2014 && 0 != strcmp(".ctors", sectab_i->Name)
2016 errorBelch("Unknown PEi386 section name `%s' (while processing: %s)", sectab_i->Name, oc->fileName);
2020 if (kind != SECTIONKIND_OTHER && end >= start) {
2021 addSection(oc, kind, start, end);
2022 addProddableBlock(oc, start, end - start + 1);
2026 /* Copy exported symbols into the ObjectCode. */
2028 oc->n_symbols = hdr->NumberOfSymbols;
2029 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
2030 "ocGetNames_PEi386(oc->symbols)");
2031 /* Call me paranoid; I don't care. */
2032 for (i = 0; i < oc->n_symbols; i++)
2033 oc->symbols[i] = NULL;
2037 COFF_symbol* symtab_i;
2038 if (i >= (Int32)(hdr->NumberOfSymbols)) break;
2039 symtab_i = (COFF_symbol*)
2040 myindex ( sizeof_COFF_symbol, symtab, i );
2044 if (symtab_i->StorageClass == MYIMAGE_SYM_CLASS_EXTERNAL
2045 && symtab_i->SectionNumber != MYIMAGE_SYM_UNDEFINED) {
2046 /* This symbol is global and defined, viz, exported */
2047 /* for MYIMAGE_SYMCLASS_EXTERNAL
2048 && !MYIMAGE_SYM_UNDEFINED,
2049 the address of the symbol is:
2050 address of relevant section + offset in section
2052 COFF_section* sectabent
2053 = (COFF_section*) myindex ( sizeof_COFF_section,
2055 symtab_i->SectionNumber-1 );
2056 addr = ((UChar*)(oc->image))
2057 + (sectabent->PointerToRawData
2061 if (symtab_i->SectionNumber == MYIMAGE_SYM_UNDEFINED
2062 && symtab_i->Value > 0) {
2063 /* This symbol isn't in any section at all, ie, global bss.
2064 Allocate zeroed space for it. */
2065 addr = stgCallocBytes(1, symtab_i->Value,
2066 "ocGetNames_PEi386(non-anonymous bss)");
2067 addSection(oc, SECTIONKIND_RWDATA, addr,
2068 ((UChar*)addr) + symtab_i->Value - 1);
2069 addProddableBlock(oc, addr, symtab_i->Value);
2070 /* debugBelch("BSS section at 0x%x\n", addr); */
2073 if (addr != NULL ) {
2074 sname = cstring_from_COFF_symbol_name ( symtab_i->Name, strtab );
2075 /* debugBelch("addSymbol %p `%s \n", addr,sname); */
2076 IF_DEBUG(linker, debugBelch("addSymbol %p `%s'\n", addr,sname);)
2077 ASSERT(i >= 0 && i < oc->n_symbols);
2078 /* cstring_from_COFF_symbol_name always succeeds. */
2079 oc->symbols[i] = sname;
2080 ghciInsertStrHashTable(oc->fileName, symhash, sname, addr);
2084 "IGNORING symbol %d\n"
2088 printName ( symtab_i->Name, strtab );
2097 (Int32)(symtab_i->SectionNumber),
2098 (UInt32)symtab_i->Type,
2099 (UInt32)symtab_i->StorageClass,
2100 (UInt32)symtab_i->NumberOfAuxSymbols
2105 i += symtab_i->NumberOfAuxSymbols;
2114 ocResolve_PEi386 ( ObjectCode* oc )
2117 COFF_section* sectab;
2118 COFF_symbol* symtab;
2128 /* ToDo: should be variable-sized? But is at least safe in the
2129 sense of buffer-overrun-proof. */
2131 /* debugBelch("resolving for %s\n", oc->fileName); */
2133 hdr = (COFF_header*)(oc->image);
2134 sectab = (COFF_section*) (
2135 ((UChar*)(oc->image))
2136 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
2138 symtab = (COFF_symbol*) (
2139 ((UChar*)(oc->image))
2140 + hdr->PointerToSymbolTable
2142 strtab = ((UChar*)(oc->image))
2143 + hdr->PointerToSymbolTable
2144 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
2146 for (i = 0; i < hdr->NumberOfSections; i++) {
2147 COFF_section* sectab_i
2149 myindex ( sizeof_COFF_section, sectab, i );
2152 ((UChar*)(oc->image)) + sectab_i->PointerToRelocations
2155 /* Ignore sections called which contain stabs debugging
2157 if (0 == strcmp(".stab", sectab_i->Name)
2158 || 0 == strcmp(".stabstr", sectab_i->Name)
2159 || 0 == strcmp(".ctors", sectab_i->Name))
2162 if ( sectab_i->Characteristics & MYIMAGE_SCN_LNK_NRELOC_OVFL ) {
2163 /* If the relocation field (a short) has overflowed, the
2164 * real count can be found in the first reloc entry.
2166 * See Section 4.1 (last para) of the PE spec (rev6.0).
2168 * Nov2003 update: the GNU linker still doesn't correctly
2169 * handle the generation of relocatable object files with
2170 * overflown relocations. Hence the output to warn of potential
2173 COFF_reloc* rel = (COFF_reloc*)
2174 myindex ( sizeof_COFF_reloc, reltab, 0 );
2175 noRelocs = rel->VirtualAddress;
2176 debugBelch("WARNING: Overflown relocation field (# relocs found: %u)\n",
2180 noRelocs = sectab_i->NumberOfRelocations;
2185 for (; j < noRelocs; j++) {
2187 COFF_reloc* reltab_j
2189 myindex ( sizeof_COFF_reloc, reltab, j );
2191 /* the location to patch */
2193 ((UChar*)(oc->image))
2194 + (sectab_i->PointerToRawData
2195 + reltab_j->VirtualAddress
2196 - sectab_i->VirtualAddress )
2198 /* the existing contents of pP */
2200 /* the symbol to connect to */
2201 sym = (COFF_symbol*)
2202 myindex ( sizeof_COFF_symbol,
2203 symtab, reltab_j->SymbolTableIndex );
2206 "reloc sec %2d num %3d: type 0x%-4x "
2207 "vaddr 0x%-8x name `",
2209 (UInt32)reltab_j->Type,
2210 reltab_j->VirtualAddress );
2211 printName ( sym->Name, strtab );
2212 debugBelch("'\n" ));
2214 if (sym->StorageClass == MYIMAGE_SYM_CLASS_STATIC) {
2215 COFF_section* section_sym
2216 = findPEi386SectionCalled ( oc, sym->Name );
2218 errorBelch("%s: can't find section `%s'", oc->fileName, sym->Name);
2221 S = ((UInt32)(oc->image))
2222 + (section_sym->PointerToRawData
2225 copyName ( sym->Name, strtab, symbol, 1000-1 );
2226 (void*)S = lookupLocalSymbol( oc, symbol );
2227 if ((void*)S != NULL) goto foundit;
2228 (void*)S = lookupSymbol( symbol );
2229 if ((void*)S != NULL) goto foundit;
2230 zapTrailingAtSign ( symbol );
2231 (void*)S = lookupLocalSymbol( oc, symbol );
2232 if ((void*)S != NULL) goto foundit;
2233 (void*)S = lookupSymbol( symbol );
2234 if ((void*)S != NULL) goto foundit;
2235 /* Newline first because the interactive linker has printed "linking..." */
2236 errorBelch("\n%s: unknown symbol `%s'", oc->fileName, symbol);
2240 checkProddableBlock(oc, pP);
2241 switch (reltab_j->Type) {
2242 case MYIMAGE_REL_I386_DIR32:
2245 case MYIMAGE_REL_I386_REL32:
2246 /* Tricky. We have to insert a displacement at
2247 pP which, when added to the PC for the _next_
2248 insn, gives the address of the target (S).
2249 Problem is to know the address of the next insn
2250 when we only know pP. We assume that this
2251 literal field is always the last in the insn,
2252 so that the address of the next insn is pP+4
2253 -- hence the constant 4.
2254 Also I don't know if A should be added, but so
2255 far it has always been zero.
2257 SOF 05/2005: 'A' (old contents of *pP) have been observed
2258 to contain values other than zero (the 'wx' object file
2259 that came with wxhaskell-0.9.4; dunno how it was compiled..).
2260 So, add displacement to old value instead of asserting
2261 A to be zero. Fixes wxhaskell-related crashes, and no other
2262 ill effects have been observed.
2264 Update: the reason why we're seeing these more elaborate
2265 relocations is due to a switch in how the NCG compiles SRTs
2266 and offsets to them from info tables. SRTs live in .(ro)data,
2267 while info tables live in .text, causing GAS to emit REL32/DISP32
2268 relocations with non-zero values. Adding the displacement is
2269 the right thing to do.
2271 *pP = S - ((UInt32)pP) - 4 + A;
2274 debugBelch("%s: unhandled PEi386 relocation type %d",
2275 oc->fileName, reltab_j->Type);
2282 IF_DEBUG(linker, debugBelch("completed %s", oc->fileName));
2286 #endif /* defined(OBJFORMAT_PEi386) */
2289 /* --------------------------------------------------------------------------
2291 * ------------------------------------------------------------------------*/
2293 #if defined(OBJFORMAT_ELF)
2298 #if defined(sparc_HOST_ARCH)
2299 # define ELF_TARGET_SPARC /* Used inside <elf.h> */
2300 #elif defined(i386_HOST_ARCH)
2301 # define ELF_TARGET_386 /* Used inside <elf.h> */
2302 #elif defined(x86_64_HOST_ARCH)
2303 # define ELF_TARGET_X64_64
2305 #elif defined (ia64_HOST_ARCH)
2306 # define ELF_TARGET_IA64 /* Used inside <elf.h> */
2308 # define ELF_FUNCTION_DESC /* calling convention uses function descriptors */
2309 # define ELF_NEED_GOT /* needs Global Offset Table */
2310 # define ELF_NEED_PLT /* needs Procedure Linkage Tables */
2313 #if !defined(openbsd_HOST_OS)
2316 /* openbsd elf has things in different places, with diff names */
2317 #include <elf_abi.h>
2318 #include <machine/reloc.h>
2319 #define R_386_32 RELOC_32
2320 #define R_386_PC32 RELOC_PC32
2324 * Define a set of types which can be used for both ELF32 and ELF64
2328 #define ELFCLASS ELFCLASS64
2329 #define Elf_Addr Elf64_Addr
2330 #define Elf_Word Elf64_Word
2331 #define Elf_Sword Elf64_Sword
2332 #define Elf_Ehdr Elf64_Ehdr
2333 #define Elf_Phdr Elf64_Phdr
2334 #define Elf_Shdr Elf64_Shdr
2335 #define Elf_Sym Elf64_Sym
2336 #define Elf_Rel Elf64_Rel
2337 #define Elf_Rela Elf64_Rela
2338 #define ELF_ST_TYPE ELF64_ST_TYPE
2339 #define ELF_ST_BIND ELF64_ST_BIND
2340 #define ELF_R_TYPE ELF64_R_TYPE
2341 #define ELF_R_SYM ELF64_R_SYM
2343 #define ELFCLASS ELFCLASS32
2344 #define Elf_Addr Elf32_Addr
2345 #define Elf_Word Elf32_Word
2346 #define Elf_Sword Elf32_Sword
2347 #define Elf_Ehdr Elf32_Ehdr
2348 #define Elf_Phdr Elf32_Phdr
2349 #define Elf_Shdr Elf32_Shdr
2350 #define Elf_Sym Elf32_Sym
2351 #define Elf_Rel Elf32_Rel
2352 #define Elf_Rela Elf32_Rela
2354 #define ELF_ST_TYPE ELF32_ST_TYPE
2357 #define ELF_ST_BIND ELF32_ST_BIND
2360 #define ELF_R_TYPE ELF32_R_TYPE
2363 #define ELF_R_SYM ELF32_R_SYM
2369 * Functions to allocate entries in dynamic sections. Currently we simply
2370 * preallocate a large number, and we don't check if a entry for the given
2371 * target already exists (a linear search is too slow). Ideally these
2372 * entries would be associated with symbols.
2375 /* These sizes sufficient to load HSbase + HShaskell98 + a few modules */
2376 #define GOT_SIZE 0x20000
2377 #define FUNCTION_TABLE_SIZE 0x10000
2378 #define PLT_SIZE 0x08000
2381 static Elf_Addr got[GOT_SIZE];
2382 static unsigned int gotIndex;
2383 static Elf_Addr gp_val = (Elf_Addr)got;
2386 allocateGOTEntry(Elf_Addr target)
2390 if (gotIndex >= GOT_SIZE)
2391 barf("Global offset table overflow");
2393 entry = &got[gotIndex++];
2395 return (Elf_Addr)entry;
2399 #ifdef ELF_FUNCTION_DESC
2405 static FunctionDesc functionTable[FUNCTION_TABLE_SIZE];
2406 static unsigned int functionTableIndex;
2409 allocateFunctionDesc(Elf_Addr target)
2411 FunctionDesc *entry;
2413 if (functionTableIndex >= FUNCTION_TABLE_SIZE)
2414 barf("Function table overflow");
2416 entry = &functionTable[functionTableIndex++];
2418 entry->gp = (Elf_Addr)gp_val;
2419 return (Elf_Addr)entry;
2423 copyFunctionDesc(Elf_Addr target)
2425 FunctionDesc *olddesc = (FunctionDesc *)target;
2426 FunctionDesc *newdesc;
2428 newdesc = (FunctionDesc *)allocateFunctionDesc(olddesc->ip);
2429 newdesc->gp = olddesc->gp;
2430 return (Elf_Addr)newdesc;
2435 #ifdef ia64_HOST_ARCH
2436 static void ia64_reloc_gprel22(Elf_Addr target, Elf_Addr value);
2437 static void ia64_reloc_pcrel21(Elf_Addr target, Elf_Addr value, ObjectCode *oc);
2439 static unsigned char plt_code[] =
2441 /* taken from binutils bfd/elfxx-ia64.c */
2442 0x0b, 0x78, 0x00, 0x02, 0x00, 0x24, /* [MMI] addl r15=0,r1;; */
2443 0x00, 0x41, 0x3c, 0x30, 0x28, 0xc0, /* ld8 r16=[r15],8 */
2444 0x01, 0x08, 0x00, 0x84, /* mov r14=r1;; */
2445 0x11, 0x08, 0x00, 0x1e, 0x18, 0x10, /* [MIB] ld8 r1=[r15] */
2446 0x60, 0x80, 0x04, 0x80, 0x03, 0x00, /* mov b6=r16 */
2447 0x60, 0x00, 0x80, 0x00 /* br.few b6;; */
2450 /* If we can't get to the function descriptor via gp, take a local copy of it */
2451 #define PLT_RELOC(code, target) { \
2452 Elf64_Sxword rel_value = target - gp_val; \
2453 if ((rel_value > 0x1fffff) || (rel_value < -0x1fffff)) \
2454 ia64_reloc_gprel22((Elf_Addr)code, copyFunctionDesc(target)); \
2456 ia64_reloc_gprel22((Elf_Addr)code, target); \
2461 unsigned char code[sizeof(plt_code)];
2465 allocatePLTEntry(Elf_Addr target, ObjectCode *oc)
2467 PLTEntry *plt = (PLTEntry *)oc->plt;
2470 if (oc->pltIndex >= PLT_SIZE)
2471 barf("Procedure table overflow");
2473 entry = &plt[oc->pltIndex++];
2474 memcpy(entry->code, plt_code, sizeof(entry->code));
2475 PLT_RELOC(entry->code, target);
2476 return (Elf_Addr)entry;
2482 return (PLT_SIZE * sizeof(PLTEntry));
2488 * Generic ELF functions
2492 findElfSection ( void* objImage, Elf_Word sh_type )
2494 char* ehdrC = (char*)objImage;
2495 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2496 Elf_Shdr* shdr = (Elf_Shdr*)(ehdrC + ehdr->e_shoff);
2497 char* sh_strtab = ehdrC + shdr[ehdr->e_shstrndx].sh_offset;
2501 for (i = 0; i < ehdr->e_shnum; i++) {
2502 if (shdr[i].sh_type == sh_type
2503 /* Ignore the section header's string table. */
2504 && i != ehdr->e_shstrndx
2505 /* Ignore string tables named .stabstr, as they contain
2507 && 0 != memcmp(".stabstr", sh_strtab + shdr[i].sh_name, 8)
2509 ptr = ehdrC + shdr[i].sh_offset;
2516 #if defined(ia64_HOST_ARCH)
2518 findElfSegment ( void* objImage, Elf_Addr vaddr )
2520 char* ehdrC = (char*)objImage;
2521 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2522 Elf_Phdr* phdr = (Elf_Phdr*)(ehdrC + ehdr->e_phoff);
2523 Elf_Addr segaddr = 0;
2526 for (i = 0; i < ehdr->e_phnum; i++) {
2527 segaddr = phdr[i].p_vaddr;
2528 if ((vaddr >= segaddr) && (vaddr < segaddr + phdr[i].p_memsz))
2536 ocVerifyImage_ELF ( ObjectCode* oc )
2540 int i, j, nent, nstrtab, nsymtabs;
2544 char* ehdrC = (char*)(oc->image);
2545 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2547 if (ehdr->e_ident[EI_MAG0] != ELFMAG0 ||
2548 ehdr->e_ident[EI_MAG1] != ELFMAG1 ||
2549 ehdr->e_ident[EI_MAG2] != ELFMAG2 ||
2550 ehdr->e_ident[EI_MAG3] != ELFMAG3) {
2551 errorBelch("%s: not an ELF object", oc->fileName);
2555 if (ehdr->e_ident[EI_CLASS] != ELFCLASS) {
2556 errorBelch("%s: unsupported ELF format", oc->fileName);
2560 if (ehdr->e_ident[EI_DATA] == ELFDATA2LSB) {
2561 IF_DEBUG(linker,debugBelch( "Is little-endian\n" ));
2563 if (ehdr->e_ident[EI_DATA] == ELFDATA2MSB) {
2564 IF_DEBUG(linker,debugBelch( "Is big-endian\n" ));
2566 errorBelch("%s: unknown endiannness", oc->fileName);
2570 if (ehdr->e_type != ET_REL) {
2571 errorBelch("%s: not a relocatable object (.o) file", oc->fileName);
2574 IF_DEBUG(linker, debugBelch( "Is a relocatable object (.o) file\n" ));
2576 IF_DEBUG(linker,debugBelch( "Architecture is " ));
2577 switch (ehdr->e_machine) {
2578 case EM_386: IF_DEBUG(linker,debugBelch( "x86" )); break;
2579 case EM_SPARC: IF_DEBUG(linker,debugBelch( "sparc" )); break;
2581 case EM_IA_64: IF_DEBUG(linker,debugBelch( "ia64" )); break;
2583 case EM_PPC: IF_DEBUG(linker,debugBelch( "powerpc32" )); break;
2585 case EM_X86_64: IF_DEBUG(linker,debugBelch( "x86_64" )); break;
2587 default: IF_DEBUG(linker,debugBelch( "unknown" ));
2588 errorBelch("%s: unknown architecture", oc->fileName);
2592 IF_DEBUG(linker,debugBelch(
2593 "\nSection header table: start %d, n_entries %d, ent_size %d\n",
2594 ehdr->e_shoff, ehdr->e_shnum, ehdr->e_shentsize ));
2596 ASSERT (ehdr->e_shentsize == sizeof(Elf_Shdr));
2598 shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
2600 if (ehdr->e_shstrndx == SHN_UNDEF) {
2601 errorBelch("%s: no section header string table", oc->fileName);
2604 IF_DEBUG(linker,debugBelch( "Section header string table is section %d\n",
2606 sh_strtab = ehdrC + shdr[ehdr->e_shstrndx].sh_offset;
2609 for (i = 0; i < ehdr->e_shnum; i++) {
2610 IF_DEBUG(linker,debugBelch("%2d: ", i ));
2611 IF_DEBUG(linker,debugBelch("type=%2d ", (int)shdr[i].sh_type ));
2612 IF_DEBUG(linker,debugBelch("size=%4d ", (int)shdr[i].sh_size ));
2613 IF_DEBUG(linker,debugBelch("offs=%4d ", (int)shdr[i].sh_offset ));
2614 IF_DEBUG(linker,debugBelch(" (%p .. %p) ",
2615 ehdrC + shdr[i].sh_offset,
2616 ehdrC + shdr[i].sh_offset + shdr[i].sh_size - 1));
2618 if (shdr[i].sh_type == SHT_REL) {
2619 IF_DEBUG(linker,debugBelch("Rel " ));
2620 } else if (shdr[i].sh_type == SHT_RELA) {
2621 IF_DEBUG(linker,debugBelch("RelA " ));
2623 IF_DEBUG(linker,debugBelch(" "));
2626 IF_DEBUG(linker,debugBelch("sname=%s\n", sh_strtab + shdr[i].sh_name ));
2630 IF_DEBUG(linker,debugBelch( "\nString tables" ));
2633 for (i = 0; i < ehdr->e_shnum; i++) {
2634 if (shdr[i].sh_type == SHT_STRTAB
2635 /* Ignore the section header's string table. */
2636 && i != ehdr->e_shstrndx
2637 /* Ignore string tables named .stabstr, as they contain
2639 && 0 != memcmp(".stabstr", sh_strtab + shdr[i].sh_name, 8)
2641 IF_DEBUG(linker,debugBelch(" section %d is a normal string table", i ));
2642 strtab = ehdrC + shdr[i].sh_offset;
2647 errorBelch("%s: no string tables, or too many", oc->fileName);
2652 IF_DEBUG(linker,debugBelch( "\nSymbol tables" ));
2653 for (i = 0; i < ehdr->e_shnum; i++) {
2654 if (shdr[i].sh_type != SHT_SYMTAB) continue;
2655 IF_DEBUG(linker,debugBelch( "section %d is a symbol table\n", i ));
2657 stab = (Elf_Sym*) (ehdrC + shdr[i].sh_offset);
2658 nent = shdr[i].sh_size / sizeof(Elf_Sym);
2659 IF_DEBUG(linker,debugBelch( " number of entries is apparently %d (%d rem)\n",
2661 shdr[i].sh_size % sizeof(Elf_Sym)
2663 if (0 != shdr[i].sh_size % sizeof(Elf_Sym)) {
2664 errorBelch("%s: non-integral number of symbol table entries", oc->fileName);
2667 for (j = 0; j < nent; j++) {
2668 IF_DEBUG(linker,debugBelch(" %2d ", j ));
2669 IF_DEBUG(linker,debugBelch(" sec=%-5d size=%-3d val=%5p ",
2670 (int)stab[j].st_shndx,
2671 (int)stab[j].st_size,
2672 (char*)stab[j].st_value ));
2674 IF_DEBUG(linker,debugBelch("type=" ));
2675 switch (ELF_ST_TYPE(stab[j].st_info)) {
2676 case STT_NOTYPE: IF_DEBUG(linker,debugBelch("notype " )); break;
2677 case STT_OBJECT: IF_DEBUG(linker,debugBelch("object " )); break;
2678 case STT_FUNC : IF_DEBUG(linker,debugBelch("func " )); break;
2679 case STT_SECTION: IF_DEBUG(linker,debugBelch("section" )); break;
2680 case STT_FILE: IF_DEBUG(linker,debugBelch("file " )); break;
2681 default: IF_DEBUG(linker,debugBelch("? " )); break;
2683 IF_DEBUG(linker,debugBelch(" " ));
2685 IF_DEBUG(linker,debugBelch("bind=" ));
2686 switch (ELF_ST_BIND(stab[j].st_info)) {
2687 case STB_LOCAL : IF_DEBUG(linker,debugBelch("local " )); break;
2688 case STB_GLOBAL: IF_DEBUG(linker,debugBelch("global" )); break;
2689 case STB_WEAK : IF_DEBUG(linker,debugBelch("weak " )); break;
2690 default: IF_DEBUG(linker,debugBelch("? " )); break;
2692 IF_DEBUG(linker,debugBelch(" " ));
2694 IF_DEBUG(linker,debugBelch("name=%s\n", strtab + stab[j].st_name ));
2698 if (nsymtabs == 0) {
2699 errorBelch("%s: didn't find any symbol tables", oc->fileName);
2706 static int getSectionKind_ELF( Elf_Shdr *hdr, int *is_bss )
2710 if (hdr->sh_type == SHT_PROGBITS
2711 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_EXECINSTR)) {
2712 /* .text-style section */
2713 return SECTIONKIND_CODE_OR_RODATA;
2716 if (hdr->sh_type == SHT_PROGBITS
2717 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_WRITE)) {
2718 /* .data-style section */
2719 return SECTIONKIND_RWDATA;
2722 if (hdr->sh_type == SHT_PROGBITS
2723 && (hdr->sh_flags & SHF_ALLOC) && !(hdr->sh_flags & SHF_WRITE)) {
2724 /* .rodata-style section */
2725 return SECTIONKIND_CODE_OR_RODATA;
2728 if (hdr->sh_type == SHT_NOBITS
2729 && (hdr->sh_flags & SHF_ALLOC) && (hdr->sh_flags & SHF_WRITE)) {
2730 /* .bss-style section */
2732 return SECTIONKIND_RWDATA;
2735 return SECTIONKIND_OTHER;
2740 ocGetNames_ELF ( ObjectCode* oc )
2745 char* ehdrC = (char*)(oc->image);
2746 Elf_Ehdr* ehdr = (Elf_Ehdr*)ehdrC;
2747 char* strtab = findElfSection ( ehdrC, SHT_STRTAB );
2748 Elf_Shdr* shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
2750 ASSERT(symhash != NULL);
2753 errorBelch("%s: no strtab", oc->fileName);
2758 for (i = 0; i < ehdr->e_shnum; i++) {
2759 /* Figure out what kind of section it is. Logic derived from
2760 Figure 1.14 ("Special Sections") of the ELF document
2761 ("Portable Formats Specification, Version 1.1"). */
2763 SectionKind kind = getSectionKind_ELF(&shdr[i], &is_bss);
2765 if (is_bss && shdr[i].sh_size > 0) {
2766 /* This is a non-empty .bss section. Allocate zeroed space for
2767 it, and set its .sh_offset field such that
2768 ehdrC + .sh_offset == addr_of_zeroed_space. */
2769 char* zspace = stgCallocBytes(1, shdr[i].sh_size,
2770 "ocGetNames_ELF(BSS)");
2771 shdr[i].sh_offset = ((char*)zspace) - ((char*)ehdrC);
2773 debugBelch("BSS section at 0x%x, size %d\n",
2774 zspace, shdr[i].sh_size);
2778 /* fill in the section info */
2779 if (kind != SECTIONKIND_OTHER && shdr[i].sh_size > 0) {
2780 addProddableBlock(oc, ehdrC + shdr[i].sh_offset, shdr[i].sh_size);
2781 addSection(oc, kind, ehdrC + shdr[i].sh_offset,
2782 ehdrC + shdr[i].sh_offset + shdr[i].sh_size - 1);
2785 if (shdr[i].sh_type != SHT_SYMTAB) continue;
2787 /* copy stuff into this module's object symbol table */
2788 stab = (Elf_Sym*) (ehdrC + shdr[i].sh_offset);
2789 nent = shdr[i].sh_size / sizeof(Elf_Sym);
2791 oc->n_symbols = nent;
2792 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
2793 "ocGetNames_ELF(oc->symbols)");
2795 for (j = 0; j < nent; j++) {
2797 char isLocal = FALSE; /* avoids uninit-var warning */
2799 char* nm = strtab + stab[j].st_name;
2800 int secno = stab[j].st_shndx;
2802 /* Figure out if we want to add it; if so, set ad to its
2803 address. Otherwise leave ad == NULL. */
2805 if (secno == SHN_COMMON) {
2807 ad = stgCallocBytes(1, stab[j].st_size, "ocGetNames_ELF(COMMON)");
2809 debugBelch("COMMON symbol, size %d name %s\n",
2810 stab[j].st_size, nm);
2812 /* Pointless to do addProddableBlock() for this area,
2813 since the linker should never poke around in it. */
2816 if ( ( ELF_ST_BIND(stab[j].st_info)==STB_GLOBAL
2817 || ELF_ST_BIND(stab[j].st_info)==STB_LOCAL
2819 /* and not an undefined symbol */
2820 && stab[j].st_shndx != SHN_UNDEF
2821 /* and not in a "special section" */
2822 && stab[j].st_shndx < SHN_LORESERVE
2824 /* and it's a not a section or string table or anything silly */
2825 ( ELF_ST_TYPE(stab[j].st_info)==STT_FUNC ||
2826 ELF_ST_TYPE(stab[j].st_info)==STT_OBJECT ||
2827 ELF_ST_TYPE(stab[j].st_info)==STT_NOTYPE
2830 /* Section 0 is the undefined section, hence > and not >=. */
2831 ASSERT(secno > 0 && secno < ehdr->e_shnum);
2833 if (shdr[secno].sh_type == SHT_NOBITS) {
2834 debugBelch(" BSS symbol, size %d off %d name %s\n",
2835 stab[j].st_size, stab[j].st_value, nm);
2838 ad = ehdrC + shdr[ secno ].sh_offset + stab[j].st_value;
2839 if (ELF_ST_BIND(stab[j].st_info)==STB_LOCAL) {
2842 #ifdef ELF_FUNCTION_DESC
2843 /* dlsym() and the initialisation table both give us function
2844 * descriptors, so to be consistent we store function descriptors
2845 * in the symbol table */
2846 if (ELF_ST_TYPE(stab[j].st_info) == STT_FUNC)
2847 ad = (char *)allocateFunctionDesc((Elf_Addr)ad);
2849 IF_DEBUG(linker,debugBelch( "addOTabName(GLOB): %10p %s %s",
2850 ad, oc->fileName, nm ));
2855 /* And the decision is ... */
2859 oc->symbols[j] = nm;
2862 /* Ignore entirely. */
2864 ghciInsertStrHashTable(oc->fileName, symhash, nm, ad);
2868 IF_DEBUG(linker,debugBelch( "skipping `%s'\n",
2869 strtab + stab[j].st_name ));
2872 "skipping bind = %d, type = %d, shndx = %d `%s'\n",
2873 (int)ELF_ST_BIND(stab[j].st_info),
2874 (int)ELF_ST_TYPE(stab[j].st_info),
2875 (int)stab[j].st_shndx,
2876 strtab + stab[j].st_name
2879 oc->symbols[j] = NULL;
2888 /* Do ELF relocations which lack an explicit addend. All x86-linux
2889 relocations appear to be of this form. */
2891 do_Elf_Rel_relocations ( ObjectCode* oc, char* ehdrC,
2892 Elf_Shdr* shdr, int shnum,
2893 Elf_Sym* stab, char* strtab )
2898 Elf_Rel* rtab = (Elf_Rel*) (ehdrC + shdr[shnum].sh_offset);
2899 int nent = shdr[shnum].sh_size / sizeof(Elf_Rel);
2900 int target_shndx = shdr[shnum].sh_info;
2901 int symtab_shndx = shdr[shnum].sh_link;
2903 stab = (Elf_Sym*) (ehdrC + shdr[ symtab_shndx ].sh_offset);
2904 targ = (Elf_Word*)(ehdrC + shdr[ target_shndx ].sh_offset);
2905 IF_DEBUG(linker,debugBelch( "relocations for section %d using symtab %d\n",
2906 target_shndx, symtab_shndx ));
2908 /* Skip sections that we're not interested in. */
2911 SectionKind kind = getSectionKind_ELF(&shdr[target_shndx], &is_bss);
2912 if (kind == SECTIONKIND_OTHER) {
2913 IF_DEBUG(linker,debugBelch( "skipping (target section not loaded)"));
2918 for (j = 0; j < nent; j++) {
2919 Elf_Addr offset = rtab[j].r_offset;
2920 Elf_Addr info = rtab[j].r_info;
2922 Elf_Addr P = ((Elf_Addr)targ) + offset;
2923 Elf_Word* pP = (Elf_Word*)P;
2929 IF_DEBUG(linker,debugBelch( "Rel entry %3d is raw(%6p %6p)",
2930 j, (void*)offset, (void*)info ));
2932 IF_DEBUG(linker,debugBelch( " ZERO" ));
2935 Elf_Sym sym = stab[ELF_R_SYM(info)];
2936 /* First see if it is a local symbol. */
2937 if (ELF_ST_BIND(sym.st_info) == STB_LOCAL) {
2938 /* Yes, so we can get the address directly from the ELF symbol
2940 symbol = sym.st_name==0 ? "(noname)" : strtab+sym.st_name;
2942 (ehdrC + shdr[ sym.st_shndx ].sh_offset
2943 + stab[ELF_R_SYM(info)].st_value);
2946 /* No, so look up the name in our global table. */
2947 symbol = strtab + sym.st_name;
2948 S_tmp = lookupSymbol( symbol );
2949 S = (Elf_Addr)S_tmp;
2952 errorBelch("%s: unknown symbol `%s'", oc->fileName, symbol);
2955 IF_DEBUG(linker,debugBelch( "`%s' resolves to %p\n", symbol, (void*)S ));
2958 IF_DEBUG(linker,debugBelch( "Reloc: P = %p S = %p A = %p\n",
2959 (void*)P, (void*)S, (void*)A ));
2960 checkProddableBlock ( oc, pP );
2964 switch (ELF_R_TYPE(info)) {
2965 # ifdef i386_HOST_ARCH
2966 case R_386_32: *pP = value; break;
2967 case R_386_PC32: *pP = value - P; break;
2970 errorBelch("%s: unhandled ELF relocation(Rel) type %d\n",
2971 oc->fileName, ELF_R_TYPE(info));
2979 /* Do ELF relocations for which explicit addends are supplied.
2980 sparc-solaris relocations appear to be of this form. */
2982 do_Elf_Rela_relocations ( ObjectCode* oc, char* ehdrC,
2983 Elf_Shdr* shdr, int shnum,
2984 Elf_Sym* stab, char* strtab )
2989 Elf_Rela* rtab = (Elf_Rela*) (ehdrC + shdr[shnum].sh_offset);
2990 int nent = shdr[shnum].sh_size / sizeof(Elf_Rela);
2991 int target_shndx = shdr[shnum].sh_info;
2992 int symtab_shndx = shdr[shnum].sh_link;
2994 stab = (Elf_Sym*) (ehdrC + shdr[ symtab_shndx ].sh_offset);
2995 targ = (Elf_Addr) (ehdrC + shdr[ target_shndx ].sh_offset);
2996 IF_DEBUG(linker,debugBelch( "relocations for section %d using symtab %d\n",
2997 target_shndx, symtab_shndx ));
2999 for (j = 0; j < nent; j++) {
3000 #if defined(DEBUG) || defined(sparc_HOST_ARCH) || defined(ia64_HOST_ARCH) || defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH)
3001 /* This #ifdef only serves to avoid unused-var warnings. */
3002 Elf_Addr offset = rtab[j].r_offset;
3003 Elf_Addr P = targ + offset;
3005 Elf_Addr info = rtab[j].r_info;
3006 Elf_Addr A = rtab[j].r_addend;
3010 # if defined(sparc_HOST_ARCH)
3011 Elf_Word* pP = (Elf_Word*)P;
3013 # elif defined(ia64_HOST_ARCH)
3014 Elf64_Xword *pP = (Elf64_Xword *)P;
3016 # elif defined(powerpc_HOST_ARCH)
3020 IF_DEBUG(linker,debugBelch( "Rel entry %3d is raw(%6p %6p %6p) ",
3021 j, (void*)offset, (void*)info,
3024 IF_DEBUG(linker,debugBelch( " ZERO" ));
3027 Elf_Sym sym = stab[ELF_R_SYM(info)];
3028 /* First see if it is a local symbol. */
3029 if (ELF_ST_BIND(sym.st_info) == STB_LOCAL) {
3030 /* Yes, so we can get the address directly from the ELF symbol
3032 symbol = sym.st_name==0 ? "(noname)" : strtab+sym.st_name;
3034 (ehdrC + shdr[ sym.st_shndx ].sh_offset
3035 + stab[ELF_R_SYM(info)].st_value);
3036 #ifdef ELF_FUNCTION_DESC
3037 /* Make a function descriptor for this function */
3038 if (S && ELF_ST_TYPE(sym.st_info) == STT_FUNC) {
3039 S = allocateFunctionDesc(S + A);
3044 /* No, so look up the name in our global table. */
3045 symbol = strtab + sym.st_name;
3046 S_tmp = lookupSymbol( symbol );
3047 S = (Elf_Addr)S_tmp;
3049 #ifdef ELF_FUNCTION_DESC
3050 /* If a function, already a function descriptor - we would
3051 have to copy it to add an offset. */
3052 if (S && (ELF_ST_TYPE(sym.st_info) == STT_FUNC) && (A != 0))
3053 errorBelch("%s: function %s with addend %p", oc->fileName, symbol, (void *)A);
3057 errorBelch("%s: unknown symbol `%s'", oc->fileName, symbol);
3060 IF_DEBUG(linker,debugBelch( "`%s' resolves to %p", symbol, (void*)S ));
3063 IF_DEBUG(linker,debugBelch("Reloc: P = %p S = %p A = %p\n",
3064 (void*)P, (void*)S, (void*)A ));
3065 /* checkProddableBlock ( oc, (void*)P ); */
3069 switch (ELF_R_TYPE(info)) {
3070 # if defined(sparc_HOST_ARCH)
3071 case R_SPARC_WDISP30:
3072 w1 = *pP & 0xC0000000;
3073 w2 = (Elf_Word)((value - P) >> 2);
3074 ASSERT((w2 & 0xC0000000) == 0);
3079 w1 = *pP & 0xFFC00000;
3080 w2 = (Elf_Word)(value >> 10);
3081 ASSERT((w2 & 0xFFC00000) == 0);
3087 w2 = (Elf_Word)(value & 0x3FF);
3088 ASSERT((w2 & ~0x3FF) == 0);
3092 /* According to the Sun documentation:
3094 This relocation type resembles R_SPARC_32, except it refers to an
3095 unaligned word. That is, the word to be relocated must be treated
3096 as four separate bytes with arbitrary alignment, not as a word
3097 aligned according to the architecture requirements.
3099 (JRS: which means that freeloading on the R_SPARC_32 case
3100 is probably wrong, but hey ...)
3104 w2 = (Elf_Word)value;
3107 # elif defined(ia64_HOST_ARCH)
3108 case R_IA64_DIR64LSB:
3109 case R_IA64_FPTR64LSB:
3112 case R_IA64_PCREL64LSB:
3115 case R_IA64_SEGREL64LSB:
3116 addr = findElfSegment(ehdrC, value);
3119 case R_IA64_GPREL22:
3120 ia64_reloc_gprel22(P, value);
3122 case R_IA64_LTOFF22:
3123 case R_IA64_LTOFF22X:
3124 case R_IA64_LTOFF_FPTR22:
3125 addr = allocateGOTEntry(value);
3126 ia64_reloc_gprel22(P, addr);
3128 case R_IA64_PCREL21B:
3129 ia64_reloc_pcrel21(P, S, oc);
3132 /* This goes with R_IA64_LTOFF22X and points to the load to
3133 * convert into a move. We don't implement relaxation. */
3135 # elif defined(powerpc_HOST_ARCH)
3136 case R_PPC_ADDR16_LO:
3137 *(Elf32_Half*) P = value;
3140 case R_PPC_ADDR16_HI:
3141 *(Elf32_Half*) P = value >> 16;
3144 case R_PPC_ADDR16_HA:
3145 *(Elf32_Half*) P = (value + 0x8000) >> 16;
3149 *(Elf32_Word *) P = value;
3153 *(Elf32_Word *) P = value - P;
3159 if( delta << 6 >> 6 != delta )
3161 value = makeJumpIsland( oc, ELF_R_SYM(info), value );
3164 if( value == 0 || delta << 6 >> 6 != delta )
3166 barf( "Unable to make ppcJumpIsland for #%d",
3172 *(Elf_Word *) P = (*(Elf_Word *) P & 0xfc000003)
3173 | (delta & 0x3fffffc);
3179 *(Elf64_Xword *)P = value;
3183 *(Elf64_Word *)P = (Elf64_Word) (value - P);
3187 *(Elf64_Word *)P = (Elf64_Word)value;
3191 *(Elf64_Sword *)P = (Elf64_Sword)value;
3196 errorBelch("%s: unhandled ELF relocation(RelA) type %d\n",
3197 oc->fileName, ELF_R_TYPE(info));
3206 ocResolve_ELF ( ObjectCode* oc )
3210 Elf_Sym* stab = NULL;
3211 char* ehdrC = (char*)(oc->image);
3212 Elf_Ehdr* ehdr = (Elf_Ehdr*) ehdrC;
3213 Elf_Shdr* shdr = (Elf_Shdr*) (ehdrC + ehdr->e_shoff);
3215 /* first find "the" symbol table */
3216 stab = (Elf_Sym*) findElfSection ( ehdrC, SHT_SYMTAB );
3218 /* also go find the string table */
3219 strtab = findElfSection ( ehdrC, SHT_STRTAB );
3221 if (stab == NULL || strtab == NULL) {
3222 errorBelch("%s: can't find string or symbol table", oc->fileName);
3226 /* Process the relocation sections. */
3227 for (shnum = 0; shnum < ehdr->e_shnum; shnum++) {
3228 if (shdr[shnum].sh_type == SHT_REL) {
3229 ok = do_Elf_Rel_relocations ( oc, ehdrC, shdr,
3230 shnum, stab, strtab );
3234 if (shdr[shnum].sh_type == SHT_RELA) {
3235 ok = do_Elf_Rela_relocations ( oc, ehdrC, shdr,
3236 shnum, stab, strtab );
3241 /* Free the local symbol table; we won't need it again. */
3242 freeHashTable(oc->lochash, NULL);
3245 #if defined(powerpc_HOST_ARCH)
3246 ocFlushInstructionCache( oc );
3254 * Instructions are 41 bits long, packed into 128 bit bundles with a 5-bit template
3255 * at the front. The following utility functions pack and unpack instructions, and
3256 * take care of the most common relocations.
3259 #ifdef ia64_HOST_ARCH
3262 ia64_extract_instruction(Elf64_Xword *target)
3265 int slot = (Elf_Addr)target & 3;
3266 (Elf_Addr)target &= ~3;
3274 return ((w1 >> 5) & 0x1ffffffffff);
3276 return (w1 >> 46) | ((w2 & 0x7fffff) << 18);
3280 barf("ia64_extract_instruction: invalid slot %p", target);
3285 ia64_deposit_instruction(Elf64_Xword *target, Elf64_Xword value)
3287 int slot = (Elf_Addr)target & 3;
3288 (Elf_Addr)target &= ~3;
3293 *target |= value << 5;
3296 *target |= value << 46;
3297 *(target+1) |= value >> 18;
3300 *(target+1) |= value << 23;
3306 ia64_reloc_gprel22(Elf_Addr target, Elf_Addr value)
3308 Elf64_Xword instruction;
3309 Elf64_Sxword rel_value;
3311 rel_value = value - gp_val;
3312 if ((rel_value > 0x1fffff) || (rel_value < -0x1fffff))
3313 barf("GP-relative data out of range (address = 0x%lx, gp = 0x%lx)", value, gp_val);
3315 instruction = ia64_extract_instruction((Elf64_Xword *)target);
3316 instruction |= (((rel_value >> 0) & 0x07f) << 13) /* imm7b */
3317 | (((rel_value >> 7) & 0x1ff) << 27) /* imm9d */
3318 | (((rel_value >> 16) & 0x01f) << 22) /* imm5c */
3319 | ((Elf64_Xword)(rel_value < 0) << 36); /* s */
3320 ia64_deposit_instruction((Elf64_Xword *)target, instruction);
3324 ia64_reloc_pcrel21(Elf_Addr target, Elf_Addr value, ObjectCode *oc)
3326 Elf64_Xword instruction;
3327 Elf64_Sxword rel_value;
3330 entry = allocatePLTEntry(value, oc);
3332 rel_value = (entry >> 4) - (target >> 4);
3333 if ((rel_value > 0xfffff) || (rel_value < -0xfffff))
3334 barf("PLT entry too far away (entry = 0x%lx, target = 0x%lx)", entry, target);
3336 instruction = ia64_extract_instruction((Elf64_Xword *)target);
3337 instruction |= ((rel_value & 0xfffff) << 13) /* imm20b */
3338 | ((Elf64_Xword)(rel_value < 0) << 36); /* s */
3339 ia64_deposit_instruction((Elf64_Xword *)target, instruction);
3345 * PowerPC ELF specifics
3348 #ifdef powerpc_HOST_ARCH
3350 static int ocAllocateJumpIslands_ELF( ObjectCode *oc )
3356 ehdr = (Elf_Ehdr *) oc->image;
3357 shdr = (Elf_Shdr *) ( ((char *)oc->image) + ehdr->e_shoff );
3359 for( i = 0; i < ehdr->e_shnum; i++ )
3360 if( shdr[i].sh_type == SHT_SYMTAB )
3363 if( i == ehdr->e_shnum )
3365 errorBelch( "This ELF file contains no symtab" );
3369 if( shdr[i].sh_entsize != sizeof( Elf_Sym ) )
3371 errorBelch( "The entry size (%d) of the symtab isn't %d\n",
3372 shdr[i].sh_entsize, sizeof( Elf_Sym ) );
3377 return ocAllocateJumpIslands( oc, shdr[i].sh_size / sizeof( Elf_Sym ), 0 );
3380 #endif /* powerpc */
3384 /* --------------------------------------------------------------------------
3386 * ------------------------------------------------------------------------*/
3388 #if defined(OBJFORMAT_MACHO)
3391 Support for MachO linking on Darwin/MacOS X
3392 by Wolfgang Thaller (wolfgang.thaller@gmx.net)
3394 I hereby formally apologize for the hackish nature of this code.
3395 Things that need to be done:
3396 *) implement ocVerifyImage_MachO
3397 *) add still more sanity checks.
3400 #ifdef powerpc_HOST_ARCH
3401 static int ocAllocateJumpIslands_MachO(ObjectCode* oc)
3403 struct mach_header *header = (struct mach_header *) oc->image;
3404 struct load_command *lc = (struct load_command *) (header + 1);
3407 for( i = 0; i < header->ncmds; i++ )
3409 if( lc->cmd == LC_SYMTAB )
3411 // Find out the first and last undefined external
3412 // symbol, so we don't have to allocate too many
3414 struct symtab_command *symLC = (struct symtab_command *) lc;
3415 unsigned min = symLC->nsyms, max = 0;
3416 struct nlist *nlist =
3417 symLC ? (struct nlist*) ((char*) oc->image + symLC->symoff)
3419 for(i=0;i<symLC->nsyms;i++)
3421 if(nlist[i].n_type & N_STAB)
3423 else if(nlist[i].n_type & N_EXT)
3425 if((nlist[i].n_type & N_TYPE) == N_UNDF
3426 && (nlist[i].n_value == 0))
3436 return ocAllocateJumpIslands(oc, max - min + 1, min);
3441 lc = (struct load_command *) ( ((char *)lc) + lc->cmdsize );
3443 return ocAllocateJumpIslands(oc,0,0);
3447 static int ocVerifyImage_MachO(ObjectCode* oc STG_UNUSED)
3449 // FIXME: do some verifying here
3453 static int resolveImports(
3456 struct symtab_command *symLC,
3457 struct section *sect, // ptr to lazy or non-lazy symbol pointer section
3458 unsigned long *indirectSyms,
3459 struct nlist *nlist)
3463 for(i=0;i*4<sect->size;i++)
3465 // according to otool, reserved1 contains the first index into the indirect symbol table
3466 struct nlist *symbol = &nlist[indirectSyms[sect->reserved1+i]];
3467 char *nm = image + symLC->stroff + symbol->n_un.n_strx;
3470 if((symbol->n_type & N_TYPE) == N_UNDF
3471 && (symbol->n_type & N_EXT) && (symbol->n_value != 0))
3472 addr = (void*) (symbol->n_value);
3473 else if((addr = lookupLocalSymbol(oc,nm)) != NULL)
3476 addr = lookupSymbol(nm);
3479 errorBelch("\n%s: unknown symbol `%s'", oc->fileName, nm);
3483 checkProddableBlock(oc,((void**)(image + sect->offset)) + i);
3484 ((void**)(image + sect->offset))[i] = addr;
3490 static unsigned long relocateAddress(
3493 struct section* sections,
3494 unsigned long address)
3497 for(i = 0; i < nSections; i++)
3499 if(sections[i].addr <= address
3500 && address < sections[i].addr + sections[i].size)
3502 return (unsigned long)oc->image
3503 + sections[i].offset + address - sections[i].addr;
3506 barf("Invalid Mach-O file:"
3507 "Address out of bounds while relocating object file");
3511 static int relocateSection(
3514 struct symtab_command *symLC, struct nlist *nlist,
3515 int nSections, struct section* sections, struct section *sect)
3517 struct relocation_info *relocs;
3520 if(!strcmp(sect->sectname,"__la_symbol_ptr"))
3522 else if(!strcmp(sect->sectname,"__nl_symbol_ptr"))
3524 else if(!strcmp(sect->sectname,"__la_sym_ptr2"))
3526 else if(!strcmp(sect->sectname,"__la_sym_ptr3"))
3530 relocs = (struct relocation_info*) (image + sect->reloff);
3534 if(relocs[i].r_address & R_SCATTERED)
3536 struct scattered_relocation_info *scat =
3537 (struct scattered_relocation_info*) &relocs[i];
3541 if(scat->r_length == 2)
3543 unsigned long word = 0;
3544 unsigned long* wordPtr = (unsigned long*) (image + sect->offset + scat->r_address);
3545 checkProddableBlock(oc,wordPtr);
3547 // Note on relocation types:
3548 // i386 uses the GENERIC_RELOC_* types,
3549 // while ppc uses special PPC_RELOC_* types.
3550 // *_RELOC_VANILLA and *_RELOC_PAIR have the same value
3551 // in both cases, all others are different.
3552 // Therefore, we use GENERIC_RELOC_VANILLA
3553 // and GENERIC_RELOC_PAIR instead of the PPC variants,
3554 // and use #ifdefs for the other types.
3556 // Step 1: Figure out what the relocated value should be
3557 if(scat->r_type == GENERIC_RELOC_VANILLA)
3559 word = *wordPtr + (unsigned long) relocateAddress(
3566 #ifdef powerpc_HOST_ARCH
3567 else if(scat->r_type == PPC_RELOC_SECTDIFF
3568 || scat->r_type == PPC_RELOC_LO16_SECTDIFF
3569 || scat->r_type == PPC_RELOC_HI16_SECTDIFF
3570 || scat->r_type == PPC_RELOC_HA16_SECTDIFF)
3572 else if(scat->r_type == GENERIC_RELOC_SECTDIFF)
3575 struct scattered_relocation_info *pair =
3576 (struct scattered_relocation_info*) &relocs[i+1];
3578 if(!pair->r_scattered || pair->r_type != GENERIC_RELOC_PAIR)
3579 barf("Invalid Mach-O file: "
3580 "RELOC_*_SECTDIFF not followed by RELOC_PAIR");
3582 word = (unsigned long)
3583 (relocateAddress(oc, nSections, sections, scat->r_value)
3584 - relocateAddress(oc, nSections, sections, pair->r_value));
3587 #ifdef powerpc_HOST_ARCH
3588 else if(scat->r_type == PPC_RELOC_HI16
3589 || scat->r_type == PPC_RELOC_LO16
3590 || scat->r_type == PPC_RELOC_HA16
3591 || scat->r_type == PPC_RELOC_LO14)
3592 { // these are generated by label+offset things
3593 struct relocation_info *pair = &relocs[i+1];
3594 if((pair->r_address & R_SCATTERED) || pair->r_type != PPC_RELOC_PAIR)
3595 barf("Invalid Mach-O file: "
3596 "PPC_RELOC_* not followed by PPC_RELOC_PAIR");
3598 if(scat->r_type == PPC_RELOC_LO16)
3600 word = ((unsigned short*) wordPtr)[1];
3601 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
3603 else if(scat->r_type == PPC_RELOC_LO14)
3605 barf("Unsupported Relocation: PPC_RELOC_LO14");
3606 word = ((unsigned short*) wordPtr)[1] & 0xFFFC;
3607 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
3609 else if(scat->r_type == PPC_RELOC_HI16)
3611 word = ((unsigned short*) wordPtr)[1] << 16;
3612 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF);
3614 else if(scat->r_type == PPC_RELOC_HA16)
3616 word = ((unsigned short*) wordPtr)[1] << 16;
3617 word += ((short)relocs[i+1].r_address & (short)0xFFFF);
3621 word += (unsigned long) relocateAddress(oc, nSections, sections, scat->r_value)
3628 continue; // ignore the others
3630 #ifdef powerpc_HOST_ARCH
3631 if(scat->r_type == GENERIC_RELOC_VANILLA
3632 || scat->r_type == PPC_RELOC_SECTDIFF)
3634 if(scat->r_type == GENERIC_RELOC_VANILLA
3635 || scat->r_type == GENERIC_RELOC_SECTDIFF)
3640 #ifdef powerpc_HOST_ARCH
3641 else if(scat->r_type == PPC_RELOC_LO16_SECTDIFF || scat->r_type == PPC_RELOC_LO16)
3643 ((unsigned short*) wordPtr)[1] = word & 0xFFFF;
3645 else if(scat->r_type == PPC_RELOC_HI16_SECTDIFF || scat->r_type == PPC_RELOC_HI16)
3647 ((unsigned short*) wordPtr)[1] = (word >> 16) & 0xFFFF;
3649 else if(scat->r_type == PPC_RELOC_HA16_SECTDIFF || scat->r_type == PPC_RELOC_HA16)
3651 ((unsigned short*) wordPtr)[1] = ((word >> 16) & 0xFFFF)
3652 + ((word & (1<<15)) ? 1 : 0);
3658 continue; // FIXME: I hope it's OK to ignore all the others.
3662 struct relocation_info *reloc = &relocs[i];
3663 if(reloc->r_pcrel && !reloc->r_extern)
3666 if(reloc->r_length == 2)
3668 unsigned long word = 0;
3669 #ifdef powerpc_HOST_ARCH
3670 unsigned long jumpIsland = 0;
3671 long offsetToJumpIsland = 0xBADBAD42; // initialise to bad value
3672 // to avoid warning and to catch
3676 unsigned long* wordPtr = (unsigned long*) (image + sect->offset + reloc->r_address);
3677 checkProddableBlock(oc,wordPtr);
3679 if(reloc->r_type == GENERIC_RELOC_VANILLA)
3683 #ifdef powerpc_HOST_ARCH
3684 else if(reloc->r_type == PPC_RELOC_LO16)
3686 word = ((unsigned short*) wordPtr)[1];
3687 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF) << 16;
3689 else if(reloc->r_type == PPC_RELOC_HI16)
3691 word = ((unsigned short*) wordPtr)[1] << 16;
3692 word |= ((unsigned long) relocs[i+1].r_address & 0xFFFF);
3694 else if(reloc->r_type == PPC_RELOC_HA16)
3696 word = ((unsigned short*) wordPtr)[1] << 16;
3697 word += ((short)relocs[i+1].r_address & (short)0xFFFF);
3699 else if(reloc->r_type == PPC_RELOC_BR24)
3702 word = (word & 0x03FFFFFC) | ((word & 0x02000000) ? 0xFC000000 : 0);
3706 if(!reloc->r_extern)
3709 sections[reloc->r_symbolnum-1].offset
3710 - sections[reloc->r_symbolnum-1].addr
3717 struct nlist *symbol = &nlist[reloc->r_symbolnum];
3718 char *nm = image + symLC->stroff + symbol->n_un.n_strx;
3719 void *symbolAddress = lookupSymbol(nm);
3722 errorBelch("\nunknown symbol `%s'", nm);
3728 #ifdef powerpc_HOST_ARCH
3729 // In the .o file, this should be a relative jump to NULL
3730 // and we'll change it to a relative jump to the symbol
3731 ASSERT(-word == reloc->r_address);
3732 jumpIsland = makeJumpIsland(oc,reloc->r_symbolnum,(unsigned long) symbolAddress);
3735 offsetToJumpIsland = word + jumpIsland
3736 - (((long)image) + sect->offset - sect->addr);
3739 word += (unsigned long) symbolAddress
3740 - (((long)image) + sect->offset - sect->addr);
3744 word += (unsigned long) symbolAddress;
3748 if(reloc->r_type == GENERIC_RELOC_VANILLA)
3753 #ifdef powerpc_HOST_ARCH
3754 else if(reloc->r_type == PPC_RELOC_LO16)
3756 ((unsigned short*) wordPtr)[1] = word & 0xFFFF;
3759 else if(reloc->r_type == PPC_RELOC_HI16)
3761 ((unsigned short*) wordPtr)[1] = (word >> 16) & 0xFFFF;
3764 else if(reloc->r_type == PPC_RELOC_HA16)
3766 ((unsigned short*) wordPtr)[1] = ((word >> 16) & 0xFFFF)
3767 + ((word & (1<<15)) ? 1 : 0);
3770 else if(reloc->r_type == PPC_RELOC_BR24)
3772 if((long)word > (long)0x01FFFFFF || (long)word < (long)0xFFE00000)
3774 // The branch offset is too large.
3775 // Therefore, we try to use a jump island.
3778 barf("unconditional relative branch out of range: "
3779 "no jump island available");
3782 word = offsetToJumpIsland;
3783 if((long)word > (long)0x01FFFFFF || (long)word < (long)0xFFE00000)
3784 barf("unconditional relative branch out of range: "
3785 "jump island out of range");
3787 *wordPtr = (*wordPtr & 0xFC000003) | (word & 0x03FFFFFC);
3792 barf("\nunknown relocation %d",reloc->r_type);
3799 static int ocGetNames_MachO(ObjectCode* oc)
3801 char *image = (char*) oc->image;
3802 struct mach_header *header = (struct mach_header*) image;
3803 struct load_command *lc = (struct load_command*) (image + sizeof(struct mach_header));
3804 unsigned i,curSymbol = 0;
3805 struct segment_command *segLC = NULL;
3806 struct section *sections;
3807 struct symtab_command *symLC = NULL;
3808 struct nlist *nlist;
3809 unsigned long commonSize = 0;
3810 char *commonStorage = NULL;
3811 unsigned long commonCounter;
3813 for(i=0;i<header->ncmds;i++)
3815 if(lc->cmd == LC_SEGMENT)
3816 segLC = (struct segment_command*) lc;
3817 else if(lc->cmd == LC_SYMTAB)
3818 symLC = (struct symtab_command*) lc;
3819 lc = (struct load_command *) ( ((char*)lc) + lc->cmdsize );
3822 sections = (struct section*) (segLC+1);
3823 nlist = symLC ? (struct nlist*) (image + symLC->symoff)
3826 for(i=0;i<segLC->nsects;i++)
3828 if(sections[i].size == 0)
3831 if((sections[i].flags & SECTION_TYPE) == S_ZEROFILL)
3833 char * zeroFillArea = stgCallocBytes(1,sections[i].size,
3834 "ocGetNames_MachO(common symbols)");
3835 sections[i].offset = zeroFillArea - image;
3838 if(!strcmp(sections[i].sectname,"__text"))
3839 addSection(oc, SECTIONKIND_CODE_OR_RODATA,
3840 (void*) (image + sections[i].offset),
3841 (void*) (image + sections[i].offset + sections[i].size));
3842 else if(!strcmp(sections[i].sectname,"__const"))
3843 addSection(oc, SECTIONKIND_RWDATA,
3844 (void*) (image + sections[i].offset),
3845 (void*) (image + sections[i].offset + sections[i].size));
3846 else if(!strcmp(sections[i].sectname,"__data"))
3847 addSection(oc, SECTIONKIND_RWDATA,
3848 (void*) (image + sections[i].offset),
3849 (void*) (image + sections[i].offset + sections[i].size));
3850 else if(!strcmp(sections[i].sectname,"__bss")
3851 || !strcmp(sections[i].sectname,"__common"))
3852 addSection(oc, SECTIONKIND_RWDATA,
3853 (void*) (image + sections[i].offset),
3854 (void*) (image + sections[i].offset + sections[i].size));
3856 addProddableBlock(oc, (void*) (image + sections[i].offset),
3860 // count external symbols defined here
3864 for(i=0;i<symLC->nsyms;i++)
3866 if(nlist[i].n_type & N_STAB)
3868 else if(nlist[i].n_type & N_EXT)
3870 if((nlist[i].n_type & N_TYPE) == N_UNDF
3871 && (nlist[i].n_value != 0))
3873 commonSize += nlist[i].n_value;
3876 else if((nlist[i].n_type & N_TYPE) == N_SECT)
3881 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
3882 "ocGetNames_MachO(oc->symbols)");
3886 for(i=0;i<symLC->nsyms;i++)
3888 if(nlist[i].n_type & N_STAB)
3890 else if((nlist[i].n_type & N_TYPE) == N_SECT)
3892 if(nlist[i].n_type & N_EXT)
3894 char *nm = image + symLC->stroff + nlist[i].n_un.n_strx;
3895 ghciInsertStrHashTable(oc->fileName, symhash, nm,
3897 + sections[nlist[i].n_sect-1].offset
3898 - sections[nlist[i].n_sect-1].addr
3899 + nlist[i].n_value);
3900 oc->symbols[curSymbol++] = nm;
3904 char *nm = image + symLC->stroff + nlist[i].n_un.n_strx;
3905 ghciInsertStrHashTable(oc->fileName, oc->lochash, nm,
3907 + sections[nlist[i].n_sect-1].offset
3908 - sections[nlist[i].n_sect-1].addr
3909 + nlist[i].n_value);
3915 commonStorage = stgCallocBytes(1,commonSize,"ocGetNames_MachO(common symbols)");
3916 commonCounter = (unsigned long)commonStorage;
3919 for(i=0;i<symLC->nsyms;i++)
3921 if((nlist[i].n_type & N_TYPE) == N_UNDF
3922 && (nlist[i].n_type & N_EXT) && (nlist[i].n_value != 0))
3924 char *nm = image + symLC->stroff + nlist[i].n_un.n_strx;
3925 unsigned long sz = nlist[i].n_value;
3927 nlist[i].n_value = commonCounter;
3929 ghciInsertStrHashTable(oc->fileName, symhash, nm,
3930 (void*)commonCounter);
3931 oc->symbols[curSymbol++] = nm;
3933 commonCounter += sz;
3940 static int ocResolve_MachO(ObjectCode* oc)
3942 char *image = (char*) oc->image;
3943 struct mach_header *header = (struct mach_header*) image;
3944 struct load_command *lc = (struct load_command*) (image + sizeof(struct mach_header));
3946 struct segment_command *segLC = NULL;
3947 struct section *sections, *la_ptrs = NULL, *nl_ptrs = NULL;
3948 struct symtab_command *symLC = NULL;
3949 struct dysymtab_command *dsymLC = NULL;
3950 struct nlist *nlist;
3952 for(i=0;i<header->ncmds;i++)
3954 if(lc->cmd == LC_SEGMENT)
3955 segLC = (struct segment_command*) lc;
3956 else if(lc->cmd == LC_SYMTAB)
3957 symLC = (struct symtab_command*) lc;
3958 else if(lc->cmd == LC_DYSYMTAB)
3959 dsymLC = (struct dysymtab_command*) lc;
3960 lc = (struct load_command *) ( ((char*)lc) + lc->cmdsize );
3963 sections = (struct section*) (segLC+1);
3964 nlist = symLC ? (struct nlist*) (image + symLC->symoff)
3967 for(i=0;i<segLC->nsects;i++)
3969 if(!strcmp(sections[i].sectname,"__la_symbol_ptr"))
3970 la_ptrs = §ions[i];
3971 else if(!strcmp(sections[i].sectname,"__nl_symbol_ptr"))
3972 nl_ptrs = §ions[i];
3973 else if(!strcmp(sections[i].sectname,"__la_sym_ptr2"))
3974 la_ptrs = §ions[i];
3975 else if(!strcmp(sections[i].sectname,"__la_sym_ptr3"))
3976 la_ptrs = §ions[i];
3981 unsigned long *indirectSyms
3982 = (unsigned long*) (image + dsymLC->indirectsymoff);
3985 if(!resolveImports(oc,image,symLC,la_ptrs,indirectSyms,nlist))
3988 if(!resolveImports(oc,image,symLC,nl_ptrs,indirectSyms,nlist))
3992 for(i=0;i<segLC->nsects;i++)
3994 if(!relocateSection(oc,image,symLC,nlist,segLC->nsects,sections,§ions[i]))
3998 /* Free the local symbol table; we won't need it again. */
3999 freeHashTable(oc->lochash, NULL);
4002 #if defined (powerpc_HOST_ARCH)
4003 ocFlushInstructionCache( oc );
4009 #ifdef powerpc_HOST_ARCH
4011 * The Mach-O object format uses leading underscores. But not everywhere.
4012 * There is a small number of runtime support functions defined in
4013 * libcc_dynamic.a whose name does not have a leading underscore.
4014 * As a consequence, we can't get their address from C code.
4015 * We have to use inline assembler just to take the address of a function.
4019 static void machoInitSymbolsWithoutUnderscore()
4021 extern void* symbolsWithoutUnderscore[];
4022 void **p = symbolsWithoutUnderscore;
4023 __asm__ volatile(".globl _symbolsWithoutUnderscore\n.data\n_symbolsWithoutUnderscore:");
4027 __asm__ volatile(".long " # x);
4029 RTS_MACHO_NOUNDERLINE_SYMBOLS
4031 __asm__ volatile(".text");
4035 ghciInsertStrHashTable("(GHCi built-in symbols)", symhash, #x, *p++);
4037 RTS_MACHO_NOUNDERLINE_SYMBOLS
4044 * Figure out by how much to shift the entire Mach-O file in memory
4045 * when loading so that its single segment ends up 16-byte-aligned
4047 static int machoGetMisalignment( FILE * f )
4049 struct mach_header header;
4052 fread(&header, sizeof(header), 1, f);
4055 if(header.magic != MH_MAGIC)
4058 misalignment = (header.sizeofcmds + sizeof(header))
4061 return misalignment ? (16 - misalignment) : 0;