1 /* -----------------------------------------------------------------------------
2 * $Id: Linker.c,v 1.54 2001/07/26 03:13:37 ken Exp $
4 * (c) The GHC Team, 2000
8 * ---------------------------------------------------------------------------*/
15 #include "LinkerInternals.h"
17 #include "StoragePriv.h"
19 #ifdef HAVE_SYS_TYPES_H
20 #include <sys/types.h>
23 #ifdef HAVE_SYS_STAT_H
31 #if defined(linux_TARGET_OS) || defined(solaris2_TARGET_OS) || defined(freebsd_TARGET_OS)
32 # define OBJFORMAT_ELF
33 #elif defined(cygwin32_TARGET_OS) || defined (mingw32_TARGET_OS)
34 # define OBJFORMAT_PEi386
38 /* Hash table mapping symbol names to Symbol */
39 /*Str*/HashTable *symhash;
41 #if defined(OBJFORMAT_ELF)
42 static int ocVerifyImage_ELF ( ObjectCode* oc );
43 static int ocGetNames_ELF ( ObjectCode* oc );
44 static int ocResolve_ELF ( ObjectCode* oc );
45 #elif defined(OBJFORMAT_PEi386)
46 static int ocVerifyImage_PEi386 ( ObjectCode* oc );
47 static int ocGetNames_PEi386 ( ObjectCode* oc );
48 static int ocResolve_PEi386 ( ObjectCode* oc );
51 /* -----------------------------------------------------------------------------
52 * Built-in symbols from the RTS
55 typedef struct _RtsSymbolVal {
62 #define Maybe_ForeignObj SymX(mkForeignObjzh_fast)
64 #define Maybe_Stable_Names SymX(mkWeakzh_fast) \
65 SymX(makeStableNamezh_fast) \
66 SymX(finalizzeWeakzh_fast)
68 /* These are not available in GUM!!! -- HWL */
69 #define Maybe_ForeignObj
70 #define Maybe_Stable_Names
73 #if !defined (mingw32_TARGET_OS)
75 #define RTS_POSIX_ONLY_SYMBOLS \
76 SymX(stg_sig_install) \
78 #define RTS_MINGW_ONLY_SYMBOLS /**/
82 #define RTS_POSIX_ONLY_SYMBOLS
84 /* These are statically linked from the mingw libraries into the ghc
85 executable, so we have to employ this hack. */
86 #define RTS_MINGW_ONLY_SYMBOLS \
100 SymX(getprotobynumber) \
101 SymX(getprotobyname) \
102 SymX(gethostbyname) \
103 SymX(gethostbyaddr) \
138 Sym(_imp___timezone) \
148 SymX(GetCurrentProcess) \
149 SymX(GetProcessTimes) \
151 SymX(GetExitCodeProcess) \
152 SymX(WaitForSingleObject) \
153 SymX(CreateProcessA) \
162 #define RTS_SYMBOLS \
164 Sym(stg_gc_enter_1) \
171 Sym(stg_gc_unpt_r1) \
172 Sym(stg_gc_unbx_r1) \
177 SymX(stg_update_PAP) \
178 SymX(stg_ap_1_upd_info) \
179 SymX(stg_ap_2_upd_info) \
180 SymX(stg_ap_3_upd_info) \
181 SymX(stg_ap_4_upd_info) \
182 SymX(stg_ap_5_upd_info) \
183 SymX(stg_ap_6_upd_info) \
184 SymX(stg_ap_7_upd_info) \
185 SymX(stg_ap_8_upd_info) \
186 SymX(stg_sel_0_upd_info) \
187 SymX(stg_sel_1_upd_info) \
188 SymX(stg_sel_2_upd_info) \
189 SymX(stg_sel_3_upd_info) \
190 SymX(stg_sel_4_upd_info) \
191 SymX(stg_sel_5_upd_info) \
192 SymX(stg_sel_6_upd_info) \
193 SymX(stg_sel_7_upd_info) \
194 SymX(stg_sel_8_upd_info) \
195 SymX(stg_sel_9_upd_info) \
196 SymX(stg_sel_10_upd_info) \
197 SymX(stg_sel_11_upd_info) \
198 SymX(stg_sel_12_upd_info) \
199 SymX(stg_sel_13_upd_info) \
200 SymX(stg_sel_14_upd_info) \
201 SymX(stg_sel_15_upd_info) \
202 SymX(stg_upd_frame_info) \
203 SymX(stg_seq_frame_info) \
204 SymX(stg_CAF_BLACKHOLE_info) \
205 SymX(stg_IND_STATIC_info) \
206 SymX(stg_EMPTY_MVAR_info) \
207 SymX(stg_MUT_ARR_PTRS_FROZEN_info) \
208 SymX(stg_WEAK_info) \
209 SymX(stg_CHARLIKE_closure) \
210 SymX(stg_INTLIKE_closure) \
212 SymX(newBCOzh_fast) \
213 SymX(mkApUpd0zh_fast) \
214 SymX(putMVarzh_fast) \
215 SymX(newMVarzh_fast) \
216 SymX(takeMVarzh_fast) \
217 SymX(tryTakeMVarzh_fast) \
218 SymX(tryPutMVarzh_fast) \
224 SymX(killThreadzh_fast) \
225 SymX(waitReadzh_fast) \
226 SymX(waitWritezh_fast) \
227 SymX(suspendThread) \
229 SymX(stackOverflow) \
230 SymX(int2Integerzh_fast) \
231 SymX(word2Integerzh_fast) \
233 SymX(__encodeDouble) \
234 SymX(decodeDoublezh_fast) \
235 SymX(decodeFloatzh_fast) \
236 SymX(gcdIntegerzh_fast) \
237 SymX(newArrayzh_fast) \
238 SymX(unsafeThawArrayzh_fast) \
239 SymX(newByteArrayzh_fast) \
240 SymX(newMutVarzh_fast) \
241 SymX(quotRemIntegerzh_fast) \
242 SymX(quotIntegerzh_fast) \
243 SymX(remIntegerzh_fast) \
244 SymX(divExactIntegerzh_fast) \
245 SymX(divModIntegerzh_fast) \
246 SymX(timesIntegerzh_fast) \
247 SymX(minusIntegerzh_fast) \
248 SymX(plusIntegerzh_fast) \
249 SymX(andIntegerzh_fast) \
250 SymX(orIntegerzh_fast) \
251 SymX(xorIntegerzh_fast) \
252 SymX(complementIntegerzh_fast) \
254 SymX(blockAsyncExceptionszh_fast) \
255 SymX(unblockAsyncExceptionszh_fast) \
257 SymX(isDoubleInfinite) \
258 SymX(isDoubleDenormalized) \
259 SymX(isDoubleNegativeZero) \
260 SymX(__encodeFloat) \
262 SymX(isFloatInfinite) \
263 SymX(isFloatDenormalized) \
264 SymX(isFloatNegativeZero) \
265 SymX(__int_encodeFloat) \
266 SymX(__int_encodeDouble) \
267 SymX(__gmpz_cmp_si) \
268 SymX(__gmpz_cmp_ui) \
271 SymX(__gmpz_get_si) \
272 SymX(__gmpz_get_ui) \
275 SymX(resetNonBlockingFd) \
278 SymX(stable_ptr_table) \
279 SymX(shutdownHaskellAndExit) \
280 Sym(stg_enterStackTop) \
281 Sym(stg_yield_to_interpreter) \
285 Sym(__init_PrelGHC) \
286 SymX(freeHaskellFunctionPtr) \
289 SymX(NoRunnableThreadsHook) \
290 SymX(StackOverflowHook) \
291 SymX(OutOfHeapHook) \
292 SymX(MallocFailHook) \
293 SymX(PatErrorHdrHook) \
296 SymX(PostTraceHook) \
297 SymX(createAdjustor) \
312 SymX(rts_mkStablePtr) \
321 SymX(rts_getWord32) \
324 SymX(rts_getDouble) \
325 SymX(rts_getStablePtr) \
331 SymX(rts_evalLazyIO) \
332 SymX(rts_checkSchedStatus)
334 #ifndef SUPPORT_LONG_LONGS
335 #define RTS_LONG_LONG_SYMS /* nothing */
337 #define RTS_LONG_LONG_SYMS \
338 SymX(int64ToIntegerzh_fast) \
339 SymX(word64ToIntegerzh_fast)
340 #endif /* SUPPORT_LONG_LONGS */
342 /* entirely bogus claims about types of these symbols */
343 #define Sym(vvv) extern void (vvv);
344 #define SymX(vvv) /**/
347 RTS_POSIX_ONLY_SYMBOLS
348 RTS_MINGW_ONLY_SYMBOLS
352 #ifdef LEADING_UNDERSCORE
353 #define MAYBE_LEADING_UNDERSCORE_STR(s) ("_" s)
355 #define MAYBE_LEADING_UNDERSCORE_STR(s) (s)
358 #define Sym(vvv) { MAYBE_LEADING_UNDERSCORE_STR(#vvv), \
360 #define SymX(vvv) Sym(vvv)
362 static RtsSymbolVal rtsSyms[] = {
365 RTS_POSIX_ONLY_SYMBOLS
366 RTS_MINGW_ONLY_SYMBOLS
367 { 0, 0 } /* sentinel */
370 /* -----------------------------------------------------------------------------
371 * initialize the object linker
373 #if defined(OBJFORMAT_ELF)
374 static void *dl_prog_handle;
382 symhash = allocStrHashTable();
384 /* populate the symbol table with stuff from the RTS */
385 for (sym = rtsSyms; sym->lbl != NULL; sym++) {
386 insertStrHashTable(symhash, sym->lbl, sym->addr);
388 # if defined(OBJFORMAT_ELF)
389 dl_prog_handle = dlopen(NULL, RTLD_LAZY);
393 /* -----------------------------------------------------------------------------
394 * Add a DLL from which symbols may be found. In the ELF case, just
395 * do RTLD_GLOBAL-style add, so no further messing around needs to
396 * happen in order that symbols in the loaded .so are findable --
397 * lookupSymbol() will subsequently see them by dlsym on the program's
398 * dl-handle. Returns NULL if success, otherwise ptr to an err msg.
400 * In the PEi386 case, open the DLLs and put handles to them in a
401 * linked list. When looking for a symbol, try all handles in the
405 #if defined(OBJFORMAT_PEi386)
406 /* A record for storing handles into DLLs. */
411 struct _OpenedDLL* next;
416 /* A list thereof. */
417 static OpenedDLL* opened_dlls = NULL;
423 addDLL ( char* path, char* dll_name )
425 # if defined(OBJFORMAT_ELF)
430 if (path == NULL || strlen(path) == 0) {
431 buf = stgMallocBytes(strlen(dll_name) + 10, "addDll");
432 sprintf(buf, "lib%s.so", dll_name);
434 buf = stgMallocBytes(strlen(path) + 1 + strlen(dll_name) + 10, "addDll");
435 sprintf(buf, "%s/lib%s.so", path, dll_name);
437 hdl = dlopen(buf, RTLD_NOW | RTLD_GLOBAL );
440 /* dlopen failed; return a ptr to the error msg. */
442 if (errmsg == NULL) errmsg = "addDLL: unknown error";
449 # elif defined(OBJFORMAT_PEi386)
451 /* Add this DLL to the list of DLLs in which to search for symbols.
452 The path argument is ignored. */
457 /* fprintf(stderr, "\naddDLL; path=`%s', dll_name = `%s'\n", path, dll_name); */
459 /* See if we've already got it, and ignore if so. */
460 for (o_dll = opened_dlls; o_dll != NULL; o_dll = o_dll->next) {
461 if (0 == strcmp(o_dll->name, dll_name))
465 buf = stgMallocBytes(strlen(dll_name) + 10, "addDLL");
466 sprintf(buf, "%s.DLL", dll_name);
467 instance = LoadLibrary(buf);
469 if (instance == NULL) {
470 /* LoadLibrary failed; return a ptr to the error msg. */
471 return "addDLL: unknown error";
474 o_dll = stgMallocBytes( sizeof(OpenedDLL), "addDLL" );
475 o_dll->name = stgMallocBytes(1+strlen(dll_name), "addDLL");
476 strcpy(o_dll->name, dll_name);
477 o_dll->instance = instance;
478 o_dll->next = opened_dlls;
483 barf("addDLL: not implemented on this platform");
487 /* -----------------------------------------------------------------------------
488 * lookup a symbol in the hash table
491 lookupSymbol( char *lbl )
494 ASSERT(symhash != NULL);
495 val = lookupStrHashTable(symhash, lbl);
498 # if defined(OBJFORMAT_ELF)
499 return dlsym(dl_prog_handle, lbl);
500 # elif defined(OBJFORMAT_PEi386)
503 for (o_dll = opened_dlls; o_dll != NULL; o_dll = o_dll->next) {
504 /* fprintf(stderr, "look in %s for %s\n", o_dll->name, lbl); */
506 /* HACK: if the name has an initial underscore, try stripping
507 it off & look that up first. I've yet to verify whether there's
508 a Rule that governs whether an initial '_' *should always* be
509 stripped off when mapping from import lib name to the DLL name.
511 sym = GetProcAddress(o_dll->instance, (lbl+1));
512 if (sym != NULL) return sym;
514 sym = GetProcAddress(o_dll->instance, lbl);
515 if (sym != NULL) return sym;
529 lookupLocalSymbol( ObjectCode* oc, char *lbl )
532 val = lookupStrHashTable(oc->lochash, lbl);
542 /* -----------------------------------------------------------------------------
543 * Load an obj (populate the global symbol table, but don't resolve yet)
545 * Returns: 1 if ok, 0 on error.
548 loadObj( char *path )
555 /* fprintf(stderr, "loadObj %s\n", path ); */
557 /* assert that we haven't already loaded this object */
560 for (o = objects; o; o = o->next)
561 ASSERT(strcmp(o->fileName, path));
565 oc = stgMallocBytes(sizeof(ObjectCode), "loadObj(oc)");
567 # if defined(OBJFORMAT_ELF)
568 oc->formatName = "ELF";
569 # elif defined(OBJFORMAT_PEi386)
570 oc->formatName = "PEi386";
573 barf("loadObj: not implemented on this platform");
577 if (r == -1) { return 0; }
579 /* sigh, strdup() isn't a POSIX function, so do it the long way */
580 oc->fileName = stgMallocBytes( strlen(path)+1, "loadObj" );
581 strcpy(oc->fileName, path);
583 oc->fileSize = st.st_size;
584 oc->image = stgMallocBytes( st.st_size, "loadObj(image)" );
587 oc->lochash = allocStrHashTable();
589 /* chain it onto the list of objects */
593 /* load the image into memory */
594 f = fopen(path, "rb");
596 barf("loadObj: can't read `%s'", path);
598 n = fread ( oc->image, 1, oc->fileSize, f );
599 if (n != oc->fileSize) {
601 barf("loadObj: error whilst reading `%s'", path);
604 /* verify the in-memory image */
605 # if defined(OBJFORMAT_ELF)
606 r = ocVerifyImage_ELF ( oc );
607 # elif defined(OBJFORMAT_PEi386)
608 r = ocVerifyImage_PEi386 ( oc );
610 barf("loadObj: no verify method");
612 if (!r) { return r; }
614 /* build the symbol list for this image */
615 # if defined(OBJFORMAT_ELF)
616 r = ocGetNames_ELF ( oc );
617 # elif defined(OBJFORMAT_PEi386)
618 r = ocGetNames_PEi386 ( oc );
620 barf("loadObj: no getNames method");
622 if (!r) { return r; }
624 /* loaded, but not resolved yet */
625 oc->status = OBJECT_LOADED;
630 /* -----------------------------------------------------------------------------
631 * resolve all the currently unlinked objects in memory
633 * Returns: 1 if ok, 0 on error.
641 for (oc = objects; oc; oc = oc->next) {
642 if (oc->status != OBJECT_RESOLVED) {
643 # if defined(OBJFORMAT_ELF)
644 r = ocResolve_ELF ( oc );
645 # elif defined(OBJFORMAT_PEi386)
646 r = ocResolve_PEi386 ( oc );
648 barf("resolveObjs: not implemented on this platform");
650 if (!r) { return r; }
651 oc->status = OBJECT_RESOLVED;
657 /* -----------------------------------------------------------------------------
658 * delete an object from the pool
661 unloadObj( char *path )
663 ObjectCode *oc, *prev;
665 ASSERT(symhash != NULL);
666 ASSERT(objects != NULL);
669 for (oc = objects; oc; prev = oc, oc = oc->next) {
670 if (!strcmp(oc->fileName,path)) {
672 /* Remove all the mappings for the symbols within this
677 for (i = 0; i < oc->n_symbols; i++) {
678 if (oc->symbols[i] != NULL) {
679 removeStrHashTable(symhash, oc->symbols[i], NULL);
687 prev->next = oc->next;
690 /* We're going to leave this in place, in case there are
691 any pointers from the heap into it: */
692 /* free(oc->image); */
696 /* The local hash table should have been freed at the end
697 of the ocResolve_ call on it. */
698 ASSERT(oc->lochash == NULL);
704 belch("unloadObj: can't find `%s' to unload", path);
708 /* --------------------------------------------------------------------------
709 * PEi386 specifics (Win32 targets)
710 * ------------------------------------------------------------------------*/
712 /* The information for this linker comes from
713 Microsoft Portable Executable
714 and Common Object File Format Specification
715 revision 5.1 January 1998
716 which SimonM says comes from the MS Developer Network CDs.
720 #if defined(OBJFORMAT_PEi386)
724 typedef unsigned char UChar;
725 typedef unsigned short UInt16;
726 typedef unsigned int UInt32;
733 UInt16 NumberOfSections;
734 UInt32 TimeDateStamp;
735 UInt32 PointerToSymbolTable;
736 UInt32 NumberOfSymbols;
737 UInt16 SizeOfOptionalHeader;
738 UInt16 Characteristics;
742 #define sizeof_COFF_header 20
749 UInt32 VirtualAddress;
750 UInt32 SizeOfRawData;
751 UInt32 PointerToRawData;
752 UInt32 PointerToRelocations;
753 UInt32 PointerToLinenumbers;
754 UInt16 NumberOfRelocations;
755 UInt16 NumberOfLineNumbers;
756 UInt32 Characteristics;
760 #define sizeof_COFF_section 40
767 UInt16 SectionNumber;
770 UChar NumberOfAuxSymbols;
774 #define sizeof_COFF_symbol 18
779 UInt32 VirtualAddress;
780 UInt32 SymbolTableIndex;
785 #define sizeof_COFF_reloc 10
788 /* From PE spec doc, section 3.3.2 */
789 /* Note use of MYIMAGE_* since IMAGE_* are already defined in
790 windows.h -- for the same purpose, but I want to know what I'm
792 #define MYIMAGE_FILE_RELOCS_STRIPPED 0x0001
793 #define MYIMAGE_FILE_EXECUTABLE_IMAGE 0x0002
794 #define MYIMAGE_FILE_DLL 0x2000
795 #define MYIMAGE_FILE_SYSTEM 0x1000
796 #define MYIMAGE_FILE_BYTES_REVERSED_HI 0x8000
797 #define MYIMAGE_FILE_BYTES_REVERSED_LO 0x0080
798 #define MYIMAGE_FILE_32BIT_MACHINE 0x0100
800 /* From PE spec doc, section 5.4.2 and 5.4.4 */
801 #define MYIMAGE_SYM_CLASS_EXTERNAL 2
802 #define MYIMAGE_SYM_CLASS_STATIC 3
803 #define MYIMAGE_SYM_UNDEFINED 0
805 /* From PE spec doc, section 4.1 */
806 #define MYIMAGE_SCN_CNT_CODE 0x00000020
807 #define MYIMAGE_SCN_CNT_INITIALIZED_DATA 0x00000040
809 /* From PE spec doc, section 5.2.1 */
810 #define MYIMAGE_REL_I386_DIR32 0x0006
811 #define MYIMAGE_REL_I386_REL32 0x0014
814 /* We use myindex to calculate array addresses, rather than
815 simply doing the normal subscript thing. That's because
816 some of the above structs have sizes which are not
817 a whole number of words. GCC rounds their sizes up to a
818 whole number of words, which means that the address calcs
819 arising from using normal C indexing or pointer arithmetic
820 are just plain wrong. Sigh.
823 myindex ( int scale, void* base, int index )
826 ((UChar*)base) + scale * index;
831 printName ( UChar* name, UChar* strtab )
833 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
834 UInt32 strtab_offset = * (UInt32*)(name+4);
835 fprintf ( stderr, "%s", strtab + strtab_offset );
838 for (i = 0; i < 8; i++) {
839 if (name[i] == 0) break;
840 fprintf ( stderr, "%c", name[i] );
847 copyName ( UChar* name, UChar* strtab, UChar* dst, int dstSize )
849 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
850 UInt32 strtab_offset = * (UInt32*)(name+4);
851 strncpy ( dst, strtab+strtab_offset, dstSize );
857 if (name[i] == 0) break;
867 cstring_from_COFF_symbol_name ( UChar* name, UChar* strtab )
870 /* If the string is longer than 8 bytes, look in the
871 string table for it -- this will be correctly zero terminated.
873 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
874 UInt32 strtab_offset = * (UInt32*)(name+4);
875 return ((UChar*)strtab) + strtab_offset;
877 /* Otherwise, if shorter than 8 bytes, return the original,
878 which by defn is correctly terminated.
880 if (name[7]==0) return name;
881 /* The annoying case: 8 bytes. Copy into a temporary
882 (which is never freed ...)
884 newstr = stgMallocBytes(9, "cstring_from_COFF_symbol_name");
886 strncpy(newstr,name,8);
892 /* Just compares the short names (first 8 chars) */
893 static COFF_section *
894 findPEi386SectionCalled ( ObjectCode* oc, char* name )
898 = (COFF_header*)(oc->image);
901 ((UChar*)(oc->image))
902 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
904 for (i = 0; i < hdr->NumberOfSections; i++) {
907 COFF_section* section_i
909 myindex ( sizeof_COFF_section, sectab, i );
910 n1 = (UChar*) &(section_i->Name);
912 if (n1[0]==n2[0] && n1[1]==n2[1] && n1[2]==n2[2] &&
913 n1[3]==n2[3] && n1[4]==n2[4] && n1[5]==n2[5] &&
914 n1[6]==n2[6] && n1[7]==n2[7])
923 zapTrailingAtSign ( UChar* sym )
925 # define my_isdigit(c) ((c) >= '0' && (c) <= '9')
927 if (sym[0] == 0) return;
929 while (sym[i] != 0) i++;
932 while (j > 0 && my_isdigit(sym[j])) j--;
933 if (j > 0 && sym[j] == '@' && j != i) sym[j] = 0;
939 ocVerifyImage_PEi386 ( ObjectCode* oc )
943 COFF_section* sectab;
946 /* fprintf(stderr, "\nLOADING %s\n", oc->fileName); */
947 hdr = (COFF_header*)(oc->image);
948 sectab = (COFF_section*) (
949 ((UChar*)(oc->image))
950 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
952 symtab = (COFF_symbol*) (
953 ((UChar*)(oc->image))
954 + hdr->PointerToSymbolTable
956 strtab = ((UChar*)symtab)
957 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
959 if (hdr->Machine != 0x14c) {
960 belch("Not x86 PEi386");
963 if (hdr->SizeOfOptionalHeader != 0) {
964 belch("PEi386 with nonempty optional header");
967 if ( /* (hdr->Characteristics & MYIMAGE_FILE_RELOCS_STRIPPED) || */
968 (hdr->Characteristics & MYIMAGE_FILE_EXECUTABLE_IMAGE) ||
969 (hdr->Characteristics & MYIMAGE_FILE_DLL) ||
970 (hdr->Characteristics & MYIMAGE_FILE_SYSTEM) ) {
971 belch("Not a PEi386 object file");
974 if ( (hdr->Characteristics & MYIMAGE_FILE_BYTES_REVERSED_HI)
975 /* || !(hdr->Characteristics & MYIMAGE_FILE_32BIT_MACHINE) */ ) {
976 belch("Invalid PEi386 word size or endiannness: %d",
977 (int)(hdr->Characteristics));
980 /* fprintf(stderr, "strtab size %d\n", * (UInt32*)strtab); */
981 if (* (UInt32*)strtab > 510000) {
982 belch("PEi386 object has suspiciously large string table; > 64k relocs?");
986 /* No further verification after this point; only debug printing. */
988 IF_DEBUG(linker, i=1);
989 if (i == 0) return 1;
992 "sectab offset = %d\n", ((UChar*)sectab) - ((UChar*)hdr) );
994 "symtab offset = %d\n", ((UChar*)symtab) - ((UChar*)hdr) );
996 "strtab offset = %d\n", ((UChar*)strtab) - ((UChar*)hdr) );
998 fprintf ( stderr, "\n" );
1000 "Machine: 0x%x\n", (UInt32)(hdr->Machine) );
1002 "# sections: %d\n", (UInt32)(hdr->NumberOfSections) );
1004 "time/date: 0x%x\n", (UInt32)(hdr->TimeDateStamp) );
1006 "symtab offset: %d\n", (UInt32)(hdr->PointerToSymbolTable) );
1008 "# symbols: %d\n", (UInt32)(hdr->NumberOfSymbols) );
1010 "sz of opt hdr: %d\n", (UInt32)(hdr->SizeOfOptionalHeader) );
1012 "characteristics: 0x%x\n", (UInt32)(hdr->Characteristics) );
1014 /* Print the section table. */
1015 fprintf ( stderr, "\n" );
1016 for (i = 0; i < hdr->NumberOfSections; i++) {
1018 COFF_section* sectab_i
1020 myindex ( sizeof_COFF_section, sectab, i );
1027 printName ( sectab_i->Name, strtab );
1036 sectab_i->VirtualSize,
1037 sectab_i->VirtualAddress,
1038 sectab_i->SizeOfRawData,
1039 sectab_i->PointerToRawData,
1040 sectab_i->NumberOfRelocations,
1041 sectab_i->PointerToRelocations
1043 reltab = (COFF_reloc*) (
1044 ((UChar*)(oc->image)) + sectab_i->PointerToRelocations
1047 for (j = 0; j < sectab_i->NumberOfRelocations; j++) {
1049 COFF_reloc* rel = (COFF_reloc*)
1050 myindex ( sizeof_COFF_reloc, reltab, j );
1052 " type 0x%-4x vaddr 0x%-8x name `",
1054 rel->VirtualAddress );
1055 sym = (COFF_symbol*)
1056 myindex ( sizeof_COFF_symbol, symtab, rel->SymbolTableIndex );
1057 printName ( sym->Name, strtab -10 );
1058 fprintf ( stderr, "'\n" );
1060 fprintf ( stderr, "\n" );
1063 fprintf ( stderr, "\n" );
1064 fprintf ( stderr, "string table has size 0x%x\n", * (UInt32*)strtab );
1065 fprintf ( stderr, "---START of string table---\n");
1066 for (i = 4; i < *(Int32*)strtab; i++) {
1068 fprintf ( stderr, "\n"); else
1069 fprintf( stderr, "%c", strtab[i] );
1071 fprintf ( stderr, "--- END of string table---\n");
1073 fprintf ( stderr, "\n" );
1076 COFF_symbol* symtab_i;
1077 if (i >= (Int32)(hdr->NumberOfSymbols)) break;
1078 symtab_i = (COFF_symbol*)
1079 myindex ( sizeof_COFF_symbol, symtab, i );
1085 printName ( symtab_i->Name, strtab );
1094 (Int32)(symtab_i->SectionNumber) - 1,
1095 (UInt32)symtab_i->Type,
1096 (UInt32)symtab_i->StorageClass,
1097 (UInt32)symtab_i->NumberOfAuxSymbols
1099 i += symtab_i->NumberOfAuxSymbols;
1103 fprintf ( stderr, "\n" );
1109 ocGetNames_PEi386 ( ObjectCode* oc )
1112 COFF_section* sectab;
1113 COFF_symbol* symtab;
1120 hdr = (COFF_header*)(oc->image);
1121 sectab = (COFF_section*) (
1122 ((UChar*)(oc->image))
1123 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
1125 symtab = (COFF_symbol*) (
1126 ((UChar*)(oc->image))
1127 + hdr->PointerToSymbolTable
1129 strtab = ((UChar*)(oc->image))
1130 + hdr->PointerToSymbolTable
1131 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
1133 /* Copy exported symbols into the ObjectCode. */
1135 oc->n_symbols = hdr->NumberOfSymbols;
1136 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
1137 "ocGetNames_PEi386(oc->symbols)");
1138 /* Call me paranoid; I don't care. */
1139 for (i = 0; i < oc->n_symbols; i++)
1140 oc->symbols[i] = NULL;
1144 COFF_symbol* symtab_i;
1145 if (i >= (Int32)(hdr->NumberOfSymbols)) break;
1146 symtab_i = (COFF_symbol*)
1147 myindex ( sizeof_COFF_symbol, symtab, i );
1149 if (symtab_i->StorageClass == MYIMAGE_SYM_CLASS_EXTERNAL &&
1150 symtab_i->SectionNumber != MYIMAGE_SYM_UNDEFINED) {
1152 /* This symbol is global and defined, viz, exported */
1153 COFF_section* sectabent;
1155 /* cstring_from_COFF_symbol_name always succeeds. */
1156 sname = cstring_from_COFF_symbol_name ( symtab_i->Name, strtab );
1158 /* for MYIMAGE_SYMCLASS_EXTERNAL
1159 && !MYIMAGE_SYM_UNDEFINED,
1160 the address of the symbol is:
1161 address of relevant section + offset in section
1163 sectabent = (COFF_section*)
1164 myindex ( sizeof_COFF_section,
1166 symtab_i->SectionNumber-1 );
1167 addr = ((UChar*)(oc->image))
1168 + (sectabent->PointerToRawData
1170 /* fprintf(stderr,"addSymbol %p `%s'\n", addr,sname); */
1171 IF_DEBUG(linker, belch("addSymbol %p `%s'\n", addr,sname);)
1172 ASSERT(i >= 0 && i < oc->n_symbols);
1173 oc->symbols[i] = sname;
1174 insertStrHashTable(symhash, sname, addr);
1176 i += symtab_i->NumberOfAuxSymbols;
1180 /* Copy section information into the ObjectCode. */
1182 oc->n_sections = hdr->NumberOfSections;
1183 oc->sections = stgMallocBytes( oc->n_sections * sizeof(Section),
1184 "ocGetNamesPEi386" );
1186 for (i = 0; i < oc->n_sections; i++) {
1191 = SECTIONKIND_OTHER;
1192 COFF_section* sectab_i
1194 myindex ( sizeof_COFF_section, sectab, i );
1195 IF_DEBUG(linker, belch("section name = %s\n", sectab_i->Name ));
1198 /* I'm sure this is the Right Way to do it. However, the
1199 alternative of testing the sectab_i->Name field seems to
1200 work ok with Cygwin.
1202 if (sectab_i->Characteristics & MYIMAGE_SCN_CNT_CODE ||
1203 sectab_i->Characteristics & MYIMAGE_SCN_CNT_INITIALIZED_DATA)
1204 kind = SECTIONKIND_CODE_OR_RODATA;
1207 if (0==strcmp(".text",sectab_i->Name) ||
1208 0==strcmp(".rodata",sectab_i->Name))
1209 kind = SECTIONKIND_CODE_OR_RODATA;
1210 if (0==strcmp(".data",sectab_i->Name) ||
1211 0==strcmp(".bss",sectab_i->Name))
1212 kind = SECTIONKIND_RWDATA;
1214 start = ((UChar*)(oc->image))
1215 + sectab_i->PointerToRawData;
1217 + sectab_i->SizeOfRawData - 1;
1219 if (kind == SECTIONKIND_OTHER) {
1220 belch("Unknown PEi386 section name `%s'", sectab_i->Name);
1224 oc->sections[i].start = start;
1225 oc->sections[i].end = end;
1226 oc->sections[i].kind = kind;
1234 ocResolve_PEi386 ( ObjectCode* oc )
1237 COFF_section* sectab;
1238 COFF_symbol* symtab;
1247 /* ToDo: should be variable-sized? But is at least safe in the
1248 sense of buffer-overrun-proof. */
1250 /* fprintf(stderr, "resolving for %s\n", oc->fileName); */
1252 hdr = (COFF_header*)(oc->image);
1253 sectab = (COFF_section*) (
1254 ((UChar*)(oc->image))
1255 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
1257 symtab = (COFF_symbol*) (
1258 ((UChar*)(oc->image))
1259 + hdr->PointerToSymbolTable
1261 strtab = ((UChar*)(oc->image))
1262 + hdr->PointerToSymbolTable
1263 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
1265 for (i = 0; i < hdr->NumberOfSections; i++) {
1266 COFF_section* sectab_i
1268 myindex ( sizeof_COFF_section, sectab, i );
1271 ((UChar*)(oc->image)) + sectab_i->PointerToRelocations
1273 for (j = 0; j < sectab_i->NumberOfRelocations; j++) {
1275 COFF_reloc* reltab_j
1277 myindex ( sizeof_COFF_reloc, reltab, j );
1279 /* the location to patch */
1281 ((UChar*)(oc->image))
1282 + (sectab_i->PointerToRawData
1283 + reltab_j->VirtualAddress
1284 - sectab_i->VirtualAddress )
1286 /* the existing contents of pP */
1288 /* the symbol to connect to */
1289 sym = (COFF_symbol*)
1290 myindex ( sizeof_COFF_symbol,
1291 symtab, reltab_j->SymbolTableIndex );
1294 "reloc sec %2d num %3d: type 0x%-4x "
1295 "vaddr 0x%-8x name `",
1297 (UInt32)reltab_j->Type,
1298 reltab_j->VirtualAddress );
1299 printName ( sym->Name, strtab );
1300 fprintf ( stderr, "'\n" ));
1302 if (sym->StorageClass == MYIMAGE_SYM_CLASS_STATIC) {
1303 COFF_section* section_sym
1304 = findPEi386SectionCalled ( oc, sym->Name );
1306 fprintf ( stderr, "bad section = `%s'\n", sym->Name );
1307 barf("Can't find abovementioned PEi386 section");
1310 S = ((UInt32)(oc->image))
1311 + (section_sym->PointerToRawData
1314 copyName ( sym->Name, strtab, symbol, 1000-1 );
1315 zapTrailingAtSign ( symbol );
1316 (void*)S = lookupLocalSymbol( oc, symbol );
1317 if ((void*)S == NULL)
1318 (void*)S = lookupSymbol( symbol );
1320 belch("ocResolve_PEi386: %s: unknown symbol `%s'",
1321 oc->fileName, symbol);
1326 switch (reltab_j->Type) {
1327 case MYIMAGE_REL_I386_DIR32:
1330 case MYIMAGE_REL_I386_REL32:
1331 /* Tricky. We have to insert a displacement at
1332 pP which, when added to the PC for the _next_
1333 insn, gives the address of the target (S).
1334 Problem is to know the address of the next insn
1335 when we only know pP. We assume that this
1336 literal field is always the last in the insn,
1337 so that the address of the next insn is pP+4
1338 -- hence the constant 4.
1339 Also I don't know if A should be added, but so
1340 far it has always been zero.
1343 *pP = S - ((UInt32)pP) - 4;
1347 "unhandled PEi386 relocation type %d\n",
1349 barf("unhandled PEi386 relocation type");
1356 /* fprintf(stderr, "completed %s\n", oc->fileName); */
1360 #endif /* defined(OBJFORMAT_PEi386) */
1363 /* --------------------------------------------------------------------------
1365 * ------------------------------------------------------------------------*/
1367 #if defined(OBJFORMAT_ELF)
1372 #if defined(sparc_TARGET_ARCH)
1373 # define ELF_TARGET_SPARC /* Used inside <elf.h> */
1374 #elif defined(i386_TARGET_ARCH)
1375 # define ELF_TARGET_386 /* Used inside <elf.h> */
1377 /* There is a similar case for IA64 in the Solaris2 headers if this
1378 * ever becomes relevant.
1384 findElfSection ( void* objImage, Elf32_Word sh_type )
1387 char* ehdrC = (char*)objImage;
1388 Elf32_Ehdr* ehdr = ( Elf32_Ehdr*)ehdrC;
1389 Elf32_Shdr* shdr = (Elf32_Shdr*) (ehdrC + ehdr->e_shoff);
1391 for (i = 0; i < ehdr->e_shnum; i++) {
1392 if (shdr[i].sh_type == sh_type &&
1393 i != ehdr->e_shstrndx) {
1394 ptr = ehdrC + shdr[i].sh_offset;
1403 ocVerifyImage_ELF ( ObjectCode* oc )
1407 int i, j, nent, nstrtab, nsymtabs;
1411 char* ehdrC = (char*)(oc->image);
1412 Elf32_Ehdr* ehdr = ( Elf32_Ehdr*)ehdrC;
1414 if (ehdr->e_ident[EI_MAG0] != ELFMAG0 ||
1415 ehdr->e_ident[EI_MAG1] != ELFMAG1 ||
1416 ehdr->e_ident[EI_MAG2] != ELFMAG2 ||
1417 ehdr->e_ident[EI_MAG3] != ELFMAG3) {
1418 belch("ocVerifyImage_ELF: not an ELF header");
1421 IF_DEBUG(linker,belch( "Is an ELF header" ));
1423 if (ehdr->e_ident[EI_CLASS] != ELFCLASS32) {
1424 belch("ocVerifyImage_ELF: not 32 bit ELF" );
1428 IF_DEBUG(linker,belch( "Is 32 bit ELF" ));
1430 if (ehdr->e_ident[EI_DATA] == ELFDATA2LSB) {
1431 IF_DEBUG(linker,belch( "Is little-endian" ));
1433 if (ehdr->e_ident[EI_DATA] == ELFDATA2MSB) {
1434 IF_DEBUG(linker,belch( "Is big-endian" ));
1436 belch("ocVerifyImage_ELF: unknown endiannness");
1440 if (ehdr->e_type != ET_REL) {
1441 belch("ocVerifyImage_ELF: not a relocatable object (.o) file");
1444 IF_DEBUG(linker, belch( "Is a relocatable object (.o) file" ));
1446 IF_DEBUG(linker,belch( "Architecture is " ));
1447 switch (ehdr->e_machine) {
1448 case EM_386: IF_DEBUG(linker,belch( "x86" )); break;
1449 case EM_SPARC: IF_DEBUG(linker,belch( "sparc" )); break;
1450 default: IF_DEBUG(linker,belch( "unknown" ));
1451 belch("ocVerifyImage_ELF: unknown architecture");
1455 IF_DEBUG(linker,belch(
1456 "\nSection header table: start %d, n_entries %d, ent_size %d",
1457 ehdr->e_shoff, ehdr->e_shnum, ehdr->e_shentsize ));
1459 ASSERT (ehdr->e_shentsize == sizeof(Elf32_Shdr));
1461 shdr = (Elf32_Shdr*) (ehdrC + ehdr->e_shoff);
1463 if (ehdr->e_shstrndx == SHN_UNDEF) {
1464 belch("ocVerifyImage_ELF: no section header string table");
1467 IF_DEBUG(linker,belch( "Section header string table is section %d",
1469 sh_strtab = ehdrC + shdr[ehdr->e_shstrndx].sh_offset;
1472 for (i = 0; i < ehdr->e_shnum; i++) {
1473 IF_DEBUG(linker,fprintf(stderr, "%2d: ", i ));
1474 IF_DEBUG(linker,fprintf(stderr, "type=%2d ", (int)shdr[i].sh_type ));
1475 IF_DEBUG(linker,fprintf(stderr, "size=%4d ", (int)shdr[i].sh_size ));
1476 IF_DEBUG(linker,fprintf(stderr, "offs=%4d ", (int)shdr[i].sh_offset ));
1477 IF_DEBUG(linker,fprintf(stderr, " (%p .. %p) ",
1478 ehdrC + shdr[i].sh_offset,
1479 ehdrC + shdr[i].sh_offset + shdr[i].sh_size - 1));
1481 if (shdr[i].sh_type == SHT_REL) {
1482 IF_DEBUG(linker,fprintf(stderr, "Rel " ));
1483 } else if (shdr[i].sh_type == SHT_RELA) {
1484 IF_DEBUG(linker,fprintf(stderr, "RelA " ));
1486 IF_DEBUG(linker,fprintf(stderr," "));
1489 IF_DEBUG(linker,fprintf(stderr, "sname=%s\n", sh_strtab + shdr[i].sh_name ));
1493 IF_DEBUG(linker,belch( "\nString tables" ));
1496 for (i = 0; i < ehdr->e_shnum; i++) {
1497 if (shdr[i].sh_type == SHT_STRTAB &&
1498 i != ehdr->e_shstrndx) {
1499 IF_DEBUG(linker,belch(" section %d is a normal string table", i ));
1500 strtab = ehdrC + shdr[i].sh_offset;
1505 belch("ocVerifyImage_ELF: no string tables, or too many");
1510 IF_DEBUG(linker,belch( "\nSymbol tables" ));
1511 for (i = 0; i < ehdr->e_shnum; i++) {
1512 if (shdr[i].sh_type != SHT_SYMTAB) continue;
1513 IF_DEBUG(linker,belch( "section %d is a symbol table", i ));
1515 stab = (Elf32_Sym*) (ehdrC + shdr[i].sh_offset);
1516 nent = shdr[i].sh_size / sizeof(Elf32_Sym);
1517 IF_DEBUG(linker,belch( " number of entries is apparently %d (%d rem)",
1519 shdr[i].sh_size % sizeof(Elf32_Sym)
1521 if (0 != shdr[i].sh_size % sizeof(Elf32_Sym)) {
1522 belch("ocVerifyImage_ELF: non-integral number of symbol table entries");
1525 for (j = 0; j < nent; j++) {
1526 IF_DEBUG(linker,fprintf(stderr, " %2d ", j ));
1527 IF_DEBUG(linker,fprintf(stderr, " sec=%-5d size=%-3d val=%5p ",
1528 (int)stab[j].st_shndx,
1529 (int)stab[j].st_size,
1530 (char*)stab[j].st_value ));
1532 IF_DEBUG(linker,fprintf(stderr, "type=" ));
1533 switch (ELF32_ST_TYPE(stab[j].st_info)) {
1534 case STT_NOTYPE: IF_DEBUG(linker,fprintf(stderr, "notype " )); break;
1535 case STT_OBJECT: IF_DEBUG(linker,fprintf(stderr, "object " )); break;
1536 case STT_FUNC : IF_DEBUG(linker,fprintf(stderr, "func " )); break;
1537 case STT_SECTION: IF_DEBUG(linker,fprintf(stderr, "section" )); break;
1538 case STT_FILE: IF_DEBUG(linker,fprintf(stderr, "file " )); break;
1539 default: IF_DEBUG(linker,fprintf(stderr, "? " )); break;
1541 IF_DEBUG(linker,fprintf(stderr, " " ));
1543 IF_DEBUG(linker,fprintf(stderr, "bind=" ));
1544 switch (ELF32_ST_BIND(stab[j].st_info)) {
1545 case STB_LOCAL : IF_DEBUG(linker,fprintf(stderr, "local " )); break;
1546 case STB_GLOBAL: IF_DEBUG(linker,fprintf(stderr, "global" )); break;
1547 case STB_WEAK : IF_DEBUG(linker,fprintf(stderr, "weak " )); break;
1548 default: IF_DEBUG(linker,fprintf(stderr, "? " )); break;
1550 IF_DEBUG(linker,fprintf(stderr, " " ));
1552 IF_DEBUG(linker,fprintf(stderr, "name=%s\n", strtab + stab[j].st_name ));
1556 if (nsymtabs == 0) {
1557 belch("ocVerifyImage_ELF: didn't find any symbol tables");
1566 ocGetNames_ELF ( ObjectCode* oc )
1571 char* ehdrC = (char*)(oc->image);
1572 Elf32_Ehdr* ehdr = (Elf32_Ehdr*)ehdrC;
1573 char* strtab = findElfSection ( ehdrC, SHT_STRTAB );
1574 Elf32_Shdr* shdr = (Elf32_Shdr*) (ehdrC + ehdr->e_shoff);
1575 char* sh_strtab = ehdrC + shdr[ehdr->e_shstrndx].sh_offset;
1577 ASSERT(symhash != NULL);
1580 belch("ocGetNames_ELF: no strtab");
1585 oc->n_sections = ehdr->e_shnum;
1586 oc->sections = stgMallocBytes( oc->n_sections * sizeof(Section),
1587 "ocGetNames_ELF(oc->sections)" );
1589 for (i = 0; i < oc->n_sections; i++) {
1591 /* make a section entry for relevant sections */
1592 SectionKind kind = SECTIONKIND_OTHER;
1593 if (!strcmp(".data",sh_strtab+shdr[i].sh_name) ||
1594 !strcmp(".data1",sh_strtab+shdr[i].sh_name))
1595 kind = SECTIONKIND_RWDATA;
1596 if (!strcmp(".text",sh_strtab+shdr[i].sh_name) ||
1597 !strcmp(".rodata",sh_strtab+shdr[i].sh_name) ||
1598 !strcmp(".rodata1",sh_strtab+shdr[i].sh_name))
1599 kind = SECTIONKIND_CODE_OR_RODATA;
1601 /* fill in the section info */
1602 oc->sections[i].start = ehdrC + shdr[i].sh_offset;
1603 oc->sections[i].end = ehdrC + shdr[i].sh_offset + shdr[i].sh_size - 1;
1604 oc->sections[i].kind = kind;
1606 if (shdr[i].sh_type != SHT_SYMTAB) continue;
1608 /* copy stuff into this module's object symbol table */
1609 stab = (Elf32_Sym*) (ehdrC + shdr[i].sh_offset);
1610 nent = shdr[i].sh_size / sizeof(Elf32_Sym);
1612 oc->n_symbols = nent;
1613 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
1614 "ocGetNames_ELF(oc->symbols)");
1616 for (j = 0; j < nent; j++) {
1617 if ( ( ELF32_ST_BIND(stab[j].st_info)==STB_GLOBAL
1618 || ELF32_ST_BIND(stab[j].st_info)==STB_LOCAL
1620 /* and not an undefined symbol */
1621 && stab[j].st_shndx != SHN_UNDEF
1622 /* and not in a "special section" */
1623 && stab[j].st_shndx < SHN_LORESERVE
1625 /* and it's a not a section or string table or anything silly */
1626 ( ELF32_ST_TYPE(stab[j].st_info)==STT_FUNC ||
1627 ELF32_ST_TYPE(stab[j].st_info)==STT_OBJECT ||
1628 ELF32_ST_TYPE(stab[j].st_info)==STT_NOTYPE
1631 char* nm = strtab + stab[j].st_name;
1633 + shdr[ stab[j].st_shndx ].sh_offset
1637 oc->symbols[j] = nm;
1638 if (ELF32_ST_BIND(stab[j].st_info)==STB_LOCAL) {
1639 IF_DEBUG(linker,belch( "addOTabName(LOCL): %10p %s %s",
1640 ad, oc->fileName, nm ));
1641 insertStrHashTable(oc->lochash, nm, ad);
1643 IF_DEBUG(linker,belch( "addOTabName(GLOB): %10p %s %s",
1644 ad, oc->fileName, nm ));
1645 insertStrHashTable(symhash, nm, ad);
1649 IF_DEBUG(linker,belch( "skipping `%s'",
1650 strtab + stab[j].st_name ));
1653 "skipping bind = %d, type = %d, shndx = %d `%s'\n",
1654 (int)ELF32_ST_BIND(stab[j].st_info),
1655 (int)ELF32_ST_TYPE(stab[j].st_info),
1656 (int)stab[j].st_shndx,
1657 strtab + stab[j].st_name
1660 oc->symbols[j] = NULL;
1669 /* Do ELF relocations which lack an explicit addend. All x86-linux
1670 relocations appear to be of this form. */
1671 static int do_Elf32_Rel_relocations ( ObjectCode* oc, char* ehdrC,
1672 Elf32_Shdr* shdr, int shnum,
1673 Elf32_Sym* stab, char* strtab )
1678 Elf32_Rel* rtab = (Elf32_Rel*) (ehdrC + shdr[shnum].sh_offset);
1679 int nent = shdr[shnum].sh_size / sizeof(Elf32_Rel);
1680 int target_shndx = shdr[shnum].sh_info;
1681 int symtab_shndx = shdr[shnum].sh_link;
1682 stab = (Elf32_Sym*) (ehdrC + shdr[ symtab_shndx ].sh_offset);
1683 targ = (Elf32_Word*)(ehdrC + shdr[ target_shndx ].sh_offset);
1684 IF_DEBUG(linker,belch( "relocations for section %d using symtab %d",
1685 target_shndx, symtab_shndx ));
1686 for (j = 0; j < nent; j++) {
1687 Elf32_Addr offset = rtab[j].r_offset;
1688 Elf32_Word info = rtab[j].r_info;
1690 Elf32_Addr P = ((Elf32_Addr)targ) + offset;
1691 Elf32_Word* pP = (Elf32_Word*)P;
1695 IF_DEBUG(linker,belch( "Rel entry %3d is raw(%6p %6p)",
1696 j, (void*)offset, (void*)info ));
1698 IF_DEBUG(linker,belch( " ZERO" ));
1701 /* First see if it is a nameless local symbol. */
1702 if (stab[ ELF32_R_SYM(info)].st_name == 0) {
1703 symbol = "(noname)";
1705 (ehdrC + shdr[stab[ELF32_R_SYM(info)].st_shndx ].sh_offset
1706 + stab[ELF32_R_SYM(info)].st_value);
1708 /* No? Should be in a symbol table then; first try the
1710 symbol = strtab+stab[ ELF32_R_SYM(info)].st_name;
1711 (void*)S = lookupLocalSymbol( oc, symbol );
1712 if ((void*)S == NULL)
1713 (void*)S = lookupSymbol( symbol );
1716 barf("do_Elf32_Rel_relocations: %s: unknown symbol `%s'",
1717 oc->fileName, symbol);
1719 IF_DEBUG(linker,belch( "`%s' resolves to %p", symbol, (void*)S ));
1721 IF_DEBUG(linker,belch( "Reloc: P = %p S = %p A = %p",
1722 (void*)P, (void*)S, (void*)A ));
1723 switch (ELF32_R_TYPE(info)) {
1724 # ifdef i386_TARGET_ARCH
1725 case R_386_32: *pP = S + A; break;
1726 case R_386_PC32: *pP = S + A - P; break;
1729 fprintf(stderr, "unhandled ELF relocation(Rel) type %d\n",
1730 ELF32_R_TYPE(info));
1731 barf("do_Elf32_Rel_relocations: unhandled ELF relocation type");
1740 /* Do ELF relocations for which explicit addends are supplied.
1741 sparc-solaris relocations appear to be of this form. */
1742 static int do_Elf32_Rela_relocations ( ObjectCode* oc, char* ehdrC,
1743 Elf32_Shdr* shdr, int shnum,
1744 Elf32_Sym* stab, char* strtab )
1749 Elf32_Rela* rtab = (Elf32_Rela*) (ehdrC + shdr[shnum].sh_offset);
1750 int nent = shdr[shnum].sh_size / sizeof(Elf32_Rela);
1751 int target_shndx = shdr[shnum].sh_info;
1752 int symtab_shndx = shdr[shnum].sh_link;
1753 stab = (Elf32_Sym*) (ehdrC + shdr[ symtab_shndx ].sh_offset);
1754 targ = (Elf32_Word*)(ehdrC + shdr[ target_shndx ].sh_offset);
1755 IF_DEBUG(linker,belch( "relocations for section %d using symtab %d",
1756 target_shndx, symtab_shndx ));
1757 for (j = 0; j < nent; j++) {
1758 Elf32_Addr offset = rtab[j].r_offset;
1759 Elf32_Word info = rtab[j].r_info;
1760 Elf32_Sword addend = rtab[j].r_addend;
1762 Elf32_Addr P = ((Elf32_Addr)targ) + offset;
1763 Elf32_Addr A = addend;
1765 # if defined(sparc_TARGET_ARCH)
1766 /* This #ifdef only serves to avoid unused-var warnings. */
1767 Elf32_Word* pP = (Elf32_Word*)P;
1771 IF_DEBUG(linker,belch( "Rel entry %3d is raw(%6p %6p %6p) ",
1772 j, (void*)offset, (void*)info,
1775 IF_DEBUG(linker,belch( " ZERO" ));
1778 /* First see if it is a nameless local symbol. */
1779 if (stab[ ELF32_R_SYM(info)].st_name == 0) {
1780 symbol = "(noname)";
1782 (ehdrC + shdr[stab[ELF32_R_SYM(info)].st_shndx ].sh_offset
1783 + stab[ELF32_R_SYM(info)].st_value);
1785 /* No? Should be in a symbol table then; first try the
1787 symbol = strtab+stab[ ELF32_R_SYM(info)].st_name;
1788 (void*)S = lookupLocalSymbol( oc, symbol );
1789 if ((void*)S == NULL)
1790 (void*)S = lookupSymbol( symbol );
1793 barf("do_Elf32_Rela_relocations: %s: unknown symbol `%s'",
1794 oc->fileName, symbol);
1797 fprintf ( stderr, "S %p A %p S+A %p S+A-P %p\n",S,A,S+A,S+A-P);
1800 IF_DEBUG(linker,belch( "`%s' resolves to %p", symbol, (void*)S ));
1802 IF_DEBUG(linker,fprintf ( stderr, "Reloc: P = %p S = %p A = %p\n",
1803 (void*)P, (void*)S, (void*)A ));
1804 switch (ELF32_R_TYPE(info)) {
1805 # if defined(sparc_TARGET_ARCH)
1806 case R_SPARC_WDISP30:
1807 w1 = *pP & 0xC0000000;
1808 w2 = (Elf32_Word)((S + A - P) >> 2);
1809 ASSERT((w2 & 0xC0000000) == 0);
1814 w1 = *pP & 0xFFC00000;
1815 w2 = (Elf32_Word)((S + A) >> 10);
1816 ASSERT((w2 & 0xFFC00000) == 0);
1822 w2 = (Elf32_Word)((S + A) & 0x3FF);
1823 ASSERT((w2 & ~0x3FF) == 0);
1828 w2 = (Elf32_Word)(S + A);
1833 fprintf(stderr, "unhandled ELF relocation(RelA) type %d\n",
1834 ELF32_R_TYPE(info));
1835 barf("do_Elf32_Rela_relocations: unhandled ELF relocation type");
1845 ocResolve_ELF ( ObjectCode* oc )
1849 Elf32_Sym* stab = NULL;
1850 char* ehdrC = (char*)(oc->image);
1851 Elf32_Ehdr* ehdr = (Elf32_Ehdr*) ehdrC;
1852 Elf32_Shdr* shdr = (Elf32_Shdr*) (ehdrC + ehdr->e_shoff);
1854 /* first find "the" symbol table */
1855 stab = (Elf32_Sym*) findElfSection ( ehdrC, SHT_SYMTAB );
1857 /* also go find the string table */
1858 strtab = findElfSection ( ehdrC, SHT_STRTAB );
1860 if (stab == NULL || strtab == NULL) {
1861 belch("ocResolve_ELF: can't find string or symbol table");
1865 /* Process the relocation sections. */
1866 for (shnum = 0; shnum < ehdr->e_shnum; shnum++) {
1867 if (shdr[shnum].sh_type == SHT_REL ) {
1868 ok = do_Elf32_Rel_relocations ( oc, ehdrC, shdr,
1869 shnum, stab, strtab );
1873 if (shdr[shnum].sh_type == SHT_RELA) {
1874 ok = do_Elf32_Rela_relocations ( oc, ehdrC, shdr,
1875 shnum, stab, strtab );
1880 /* Free the local symbol table; we won't need it again. */
1881 freeHashTable(oc->lochash, NULL);