1 /* -----------------------------------------------------------------------------
2 * $Id: Linker.c,v 1.80 2002/01/29 06:15:03 sof Exp $
4 * (c) The GHC Team, 2000, 2001
8 * ---------------------------------------------------------------------------*/
10 #include "PosixSource.h"
16 #include "LinkerInternals.h"
18 #include "StoragePriv.h"
21 #ifdef HAVE_SYS_TYPES_H
22 #include <sys/types.h>
25 #ifdef HAVE_SYS_STAT_H
33 #if defined(linux_TARGET_OS) || defined(solaris2_TARGET_OS) || defined(freebsd_TARGET_OS)
34 # define OBJFORMAT_ELF
35 #elif defined(cygwin32_TARGET_OS) || defined (mingw32_TARGET_OS)
36 # define OBJFORMAT_PEi386
40 /* Hash table mapping symbol names to Symbol */
41 /*Str*/HashTable *symhash;
43 #if defined(OBJFORMAT_ELF)
44 static int ocVerifyImage_ELF ( ObjectCode* oc );
45 static int ocGetNames_ELF ( ObjectCode* oc );
46 static int ocResolve_ELF ( ObjectCode* oc );
47 #elif defined(OBJFORMAT_PEi386)
48 static int ocVerifyImage_PEi386 ( ObjectCode* oc );
49 static int ocGetNames_PEi386 ( ObjectCode* oc );
50 static int ocResolve_PEi386 ( ObjectCode* oc );
53 /* -----------------------------------------------------------------------------
54 * Built-in symbols from the RTS
57 typedef struct _RtsSymbolVal {
64 #define Maybe_ForeignObj SymX(mkForeignObjzh_fast)
66 #define Maybe_Stable_Names SymX(mkWeakzh_fast) \
67 SymX(makeStableNamezh_fast) \
68 SymX(finalizzeWeakzh_fast)
70 /* These are not available in GUM!!! -- HWL */
71 #define Maybe_ForeignObj
72 #define Maybe_Stable_Names
75 #if !defined (mingw32_TARGET_OS)
77 #define RTS_POSIX_ONLY_SYMBOLS \
78 SymX(stg_sig_install) \
80 #define RTS_MINGW_ONLY_SYMBOLS /**/
84 #define RTS_POSIX_ONLY_SYMBOLS
86 /* These are statically linked from the mingw libraries into the ghc
87 executable, so we have to employ this hack. */
88 #define RTS_MINGW_ONLY_SYMBOLS \
100 SymX(getservbyname) \
101 SymX(getservbyport) \
102 SymX(getprotobynumber) \
103 SymX(getprotobyname) \
104 SymX(gethostbyname) \
105 SymX(gethostbyaddr) \
140 Sym(_imp___timezone) \
155 # define MAIN_CAP_SYM SymX(MainCapability)
157 # define MAIN_CAP_SYM
160 #define RTS_SYMBOLS \
164 Sym(__stginit_PrelGHC) \
168 Sym(stg_enterStackTop) \
171 SymX(__stg_gc_enter_1) \
173 SymX(stg_gc_noregs) \
175 SymX(stg_gc_unbx_r1) \
176 SymX(stg_gc_unpt_r1) \
177 SymX(stg_gc_ut_0_1) \
178 SymX(stg_gc_ut_1_0) \
180 SymX(stg_yield_to_interpreter) \
183 SymX(MallocFailHook) \
184 SymX(NoRunnableThreadsHook) \
186 SymX(OutOfHeapHook) \
187 SymX(PatErrorHdrHook) \
188 SymX(PostTraceHook) \
190 SymX(StackOverflowHook) \
191 SymX(__encodeDouble) \
192 SymX(__encodeFloat) \
195 SymX(__gmpz_cmp_si) \
196 SymX(__gmpz_cmp_ui) \
197 SymX(__gmpz_get_si) \
198 SymX(__gmpz_get_ui) \
199 SymX(__int_encodeDouble) \
200 SymX(__int_encodeFloat) \
201 SymX(andIntegerzh_fast) \
202 SymX(blockAsyncExceptionszh_fast) \
205 SymX(complementIntegerzh_fast) \
206 SymX(cmpIntegerzh_fast) \
207 SymX(cmpIntegerIntzh_fast) \
208 SymX(createAdjustor) \
209 SymX(decodeDoublezh_fast) \
210 SymX(decodeFloatzh_fast) \
213 SymX(deRefWeakzh_fast) \
214 SymX(deRefStablePtrzh_fast) \
215 SymX(divExactIntegerzh_fast) \
216 SymX(divModIntegerzh_fast) \
218 SymX(freeHaskellFunctionPtr) \
219 SymX(freeStablePtr) \
220 SymX(gcdIntegerzh_fast) \
221 SymX(gcdIntegerIntzh_fast) \
222 SymX(gcdIntzh_fast) \
225 SymX(int2Integerzh_fast) \
226 SymX(integer2Intzh_fast) \
227 SymX(integer2Wordzh_fast) \
228 SymX(isDoubleDenormalized) \
229 SymX(isDoubleInfinite) \
231 SymX(isDoubleNegativeZero) \
232 SymX(isEmptyMVarzh_fast) \
233 SymX(isFloatDenormalized) \
234 SymX(isFloatInfinite) \
236 SymX(isFloatNegativeZero) \
237 SymX(killThreadzh_fast) \
238 SymX(makeStablePtrzh_fast) \
239 SymX(minusIntegerzh_fast) \
240 SymX(mkApUpd0zh_fast) \
241 SymX(myThreadIdzh_fast) \
242 SymX(newArrayzh_fast) \
243 SymX(newBCOzh_fast) \
244 SymX(newByteArrayzh_fast) \
246 SymX(newMVarzh_fast) \
247 SymX(newMutVarzh_fast) \
248 SymX(newPinnedByteArrayzh_fast) \
249 SymX(orIntegerzh_fast) \
251 SymX(plusIntegerzh_fast) \
254 SymX(putMVarzh_fast) \
255 SymX(quotIntegerzh_fast) \
256 SymX(quotRemIntegerzh_fast) \
258 SymX(remIntegerzh_fast) \
259 SymX(resetNonBlockingFd) \
262 SymX(rts_checkSchedStatus) \
265 SymX(rts_evalLazyIO) \
270 SymX(rts_getDouble) \
275 SymX(rts_getStablePtr) \
276 SymX(rts_getThreadId) \
278 SymX(rts_getWord32) \
290 SymX(rts_mkStablePtr) \
299 SymX(shutdownHaskellAndExit) \
300 SymX(stable_ptr_table) \
301 SymX(stackOverflow) \
302 SymX(stg_CAF_BLACKHOLE_info) \
303 SymX(stg_CHARLIKE_closure) \
304 SymX(stg_EMPTY_MVAR_info) \
305 SymX(stg_IND_STATIC_info) \
306 SymX(stg_INTLIKE_closure) \
307 SymX(stg_MUT_ARR_PTRS_FROZEN_info) \
308 SymX(stg_WEAK_info) \
309 SymX(stg_ap_1_upd_info) \
310 SymX(stg_ap_2_upd_info) \
311 SymX(stg_ap_3_upd_info) \
312 SymX(stg_ap_4_upd_info) \
313 SymX(stg_ap_5_upd_info) \
314 SymX(stg_ap_6_upd_info) \
315 SymX(stg_ap_7_upd_info) \
316 SymX(stg_ap_8_upd_info) \
318 SymX(stg_sel_0_upd_info) \
319 SymX(stg_sel_10_upd_info) \
320 SymX(stg_sel_11_upd_info) \
321 SymX(stg_sel_12_upd_info) \
322 SymX(stg_sel_13_upd_info) \
323 SymX(stg_sel_14_upd_info) \
324 SymX(stg_sel_15_upd_info) \
325 SymX(stg_sel_1_upd_info) \
326 SymX(stg_sel_2_upd_info) \
327 SymX(stg_sel_3_upd_info) \
328 SymX(stg_sel_4_upd_info) \
329 SymX(stg_sel_5_upd_info) \
330 SymX(stg_sel_6_upd_info) \
331 SymX(stg_sel_7_upd_info) \
332 SymX(stg_sel_8_upd_info) \
333 SymX(stg_sel_9_upd_info) \
334 SymX(stg_seq_frame_info) \
335 SymX(stg_upd_frame_info) \
336 SymX(__stg_update_PAP) \
337 SymX(suspendThread) \
338 SymX(takeMVarzh_fast) \
339 SymX(timesIntegerzh_fast) \
340 SymX(tryPutMVarzh_fast) \
341 SymX(tryTakeMVarzh_fast) \
342 SymX(unblockAsyncExceptionszh_fast) \
343 SymX(unsafeThawArrayzh_fast) \
344 SymX(waitReadzh_fast) \
345 SymX(waitWritezh_fast) \
346 SymX(word2Integerzh_fast) \
347 SymX(xorIntegerzh_fast) \
350 #ifndef SUPPORT_LONG_LONGS
351 #define RTS_LONG_LONG_SYMS /* nothing */
353 #define RTS_LONG_LONG_SYMS \
354 SymX(int64ToIntegerzh_fast) \
355 SymX(word64ToIntegerzh_fast)
356 #endif /* SUPPORT_LONG_LONGS */
358 /* entirely bogus claims about types of these symbols */
359 #define Sym(vvv) extern void (vvv);
360 #define SymX(vvv) /**/
363 RTS_POSIX_ONLY_SYMBOLS
364 RTS_MINGW_ONLY_SYMBOLS
368 #ifdef LEADING_UNDERSCORE
369 #define MAYBE_LEADING_UNDERSCORE_STR(s) ("_" s)
371 #define MAYBE_LEADING_UNDERSCORE_STR(s) (s)
374 #define Sym(vvv) { MAYBE_LEADING_UNDERSCORE_STR(#vvv), \
376 #define SymX(vvv) Sym(vvv)
378 static RtsSymbolVal rtsSyms[] = {
381 RTS_POSIX_ONLY_SYMBOLS
382 RTS_MINGW_ONLY_SYMBOLS
383 { 0, 0 } /* sentinel */
386 /* -----------------------------------------------------------------------------
387 * Insert symbols into hash tables, checking for duplicates.
389 static void ghciInsertStrHashTable ( char* obj_name,
395 if (lookupHashTable(table, (StgWord)key) == NULL)
397 insertStrHashTable(table, (StgWord)key, data);
402 "GHCi runtime linker: fatal error: I found a duplicate definition for symbol\n"
404 "whilst processing object file\n"
406 "This could be caused by:\n"
407 " * Loading two different object files which export the same symbol\n"
408 " * Specifying the same object file twice on the GHCi command line\n"
409 " * An incorrect `package.conf' entry, causing some object to be\n"
411 "GHCi cannot safely continue in this situation. Exiting now. Sorry.\n"
420 /* -----------------------------------------------------------------------------
421 * initialize the object linker
423 #if defined(OBJFORMAT_ELF)
424 static void *dl_prog_handle;
432 symhash = allocStrHashTable();
434 /* populate the symbol table with stuff from the RTS */
435 for (sym = rtsSyms; sym->lbl != NULL; sym++) {
436 ghciInsertStrHashTable("(GHCi built-in symbols)",
437 symhash, sym->lbl, sym->addr);
439 # if defined(OBJFORMAT_ELF)
440 dl_prog_handle = dlopen(NULL, RTLD_LAZY);
444 /* -----------------------------------------------------------------------------
445 * Add a DLL from which symbols may be found. In the ELF case, just
446 * do RTLD_GLOBAL-style add, so no further messing around needs to
447 * happen in order that symbols in the loaded .so are findable --
448 * lookupSymbol() will subsequently see them by dlsym on the program's
449 * dl-handle. Returns NULL if success, otherwise ptr to an err msg.
451 * In the PEi386 case, open the DLLs and put handles to them in a
452 * linked list. When looking for a symbol, try all handles in the
456 #if defined(OBJFORMAT_PEi386)
457 /* A record for storing handles into DLLs. */
462 struct _OpenedDLL* next;
467 /* A list thereof. */
468 static OpenedDLL* opened_dlls = NULL;
474 addDLL ( __attribute((unused)) char* path, char* dll_name )
476 # if defined(OBJFORMAT_ELF)
481 if (path == NULL || strlen(path) == 0) {
482 buf = stgMallocBytes(strlen(dll_name) + 10, "addDll");
483 sprintf(buf, "lib%s.so", dll_name);
485 buf = stgMallocBytes(strlen(path) + 1 + strlen(dll_name) + 10, "addDll");
486 sprintf(buf, "%s/lib%s.so", path, dll_name);
488 hdl = dlopen(buf, RTLD_NOW | RTLD_GLOBAL );
491 /* dlopen failed; return a ptr to the error msg. */
493 if (errmsg == NULL) errmsg = "addDLL: unknown error";
500 # elif defined(OBJFORMAT_PEi386)
502 /* Add this DLL to the list of DLLs in which to search for symbols.
503 The path argument is ignored. */
508 /* fprintf(stderr, "\naddDLL; path=`%s', dll_name = `%s'\n", path, dll_name); */
510 /* See if we've already got it, and ignore if so. */
511 for (o_dll = opened_dlls; o_dll != NULL; o_dll = o_dll->next) {
512 if (0 == strcmp(o_dll->name, dll_name))
516 buf = stgMallocBytes(strlen(dll_name) + 10, "addDLL");
517 sprintf(buf, "%s.DLL", dll_name);
518 instance = LoadLibrary(buf);
520 if (instance == NULL) {
521 /* LoadLibrary failed; return a ptr to the error msg. */
522 return "addDLL: unknown error";
525 o_dll = stgMallocBytes( sizeof(OpenedDLL), "addDLL" );
526 o_dll->name = stgMallocBytes(1+strlen(dll_name), "addDLL");
527 strcpy(o_dll->name, dll_name);
528 o_dll->instance = instance;
529 o_dll->next = opened_dlls;
534 barf("addDLL: not implemented on this platform");
538 /* -----------------------------------------------------------------------------
539 * lookup a symbol in the hash table
542 lookupSymbol( char *lbl )
545 ASSERT(symhash != NULL);
546 val = lookupStrHashTable(symhash, lbl);
549 # if defined(OBJFORMAT_ELF)
550 return dlsym(dl_prog_handle, lbl);
551 # elif defined(OBJFORMAT_PEi386)
554 for (o_dll = opened_dlls; o_dll != NULL; o_dll = o_dll->next) {
555 /* fprintf(stderr, "look in %s for %s\n", o_dll->name, lbl); */
557 /* HACK: if the name has an initial underscore, try stripping
558 it off & look that up first. I've yet to verify whether there's
559 a Rule that governs whether an initial '_' *should always* be
560 stripped off when mapping from import lib name to the DLL name.
562 sym = GetProcAddress(o_dll->instance, (lbl+1));
564 /*fprintf(stderr, "found %s in %s\n", lbl+1,o_dll->name); fflush(stderr);*/
568 sym = GetProcAddress(o_dll->instance, lbl);
570 /*fprintf(stderr, "found %s in %s\n", lbl,o_dll->name); fflush(stderr);*/
585 __attribute((unused))
587 lookupLocalSymbol( ObjectCode* oc, char *lbl )
590 val = lookupStrHashTable(oc->lochash, lbl);
600 /* -----------------------------------------------------------------------------
601 * Debugging aid: look in GHCi's object symbol tables for symbols
602 * within DELTA bytes of the specified address, and show their names.
605 void ghci_enquire ( char* addr );
607 void ghci_enquire ( char* addr )
612 const int DELTA = 64;
614 for (oc = objects; oc; oc = oc->next) {
615 for (i = 0; i < oc->n_symbols; i++) {
616 sym = oc->symbols[i];
617 if (sym == NULL) continue;
618 /* fprintf(stderr, "enquire %p %p\n", sym, oc->lochash); */
620 if (oc->lochash != NULL)
621 a = lookupStrHashTable(oc->lochash, sym);
623 a = lookupStrHashTable(symhash, sym);
625 /* fprintf(stderr, "ghci_enquire: can't find %s\n", sym); */
627 else if (addr-DELTA <= a && a <= addr+DELTA) {
628 fprintf(stderr, "%p + %3d == `%s'\n", addr, a - addr, sym);
636 /* -----------------------------------------------------------------------------
637 * Load an obj (populate the global symbol table, but don't resolve yet)
639 * Returns: 1 if ok, 0 on error.
642 loadObj( char *path )
649 /* fprintf(stderr, "loadObj %s\n", path ); */
651 /* Check that we haven't already loaded this object. Don't give up
652 at this stage; ocGetNames_* will barf later. */
656 for (o = objects; o; o = o->next) {
657 if (0 == strcmp(o->fileName, path))
663 "GHCi runtime linker: warning: looks like you're trying to load the\n"
664 "same object file twice:\n"
666 "GHCi will continue, but a duplicate-symbol error may shortly follow.\n"
672 oc = stgMallocBytes(sizeof(ObjectCode), "loadObj(oc)");
674 # if defined(OBJFORMAT_ELF)
675 oc->formatName = "ELF";
676 # elif defined(OBJFORMAT_PEi386)
677 oc->formatName = "PEi386";
680 barf("loadObj: not implemented on this platform");
684 if (r == -1) { return 0; }
686 /* sigh, strdup() isn't a POSIX function, so do it the long way */
687 oc->fileName = stgMallocBytes( strlen(path)+1, "loadObj" );
688 strcpy(oc->fileName, path);
690 oc->fileSize = st.st_size;
691 oc->image = stgMallocBytes( st.st_size, "loadObj(image)" );
694 oc->lochash = allocStrHashTable();
695 oc->proddables = NULL;
697 /* chain it onto the list of objects */
701 /* load the image into memory */
702 f = fopen(path, "rb");
704 barf("loadObj: can't read `%s'", path);
706 n = fread ( oc->image, 1, oc->fileSize, f );
707 if (n != oc->fileSize) {
709 barf("loadObj: error whilst reading `%s'", path);
712 /* verify the in-memory image */
713 # if defined(OBJFORMAT_ELF)
714 r = ocVerifyImage_ELF ( oc );
715 # elif defined(OBJFORMAT_PEi386)
716 r = ocVerifyImage_PEi386 ( oc );
718 barf("loadObj: no verify method");
720 if (!r) { return r; }
722 /* build the symbol list for this image */
723 # if defined(OBJFORMAT_ELF)
724 r = ocGetNames_ELF ( oc );
725 # elif defined(OBJFORMAT_PEi386)
726 r = ocGetNames_PEi386 ( oc );
728 barf("loadObj: no getNames method");
730 if (!r) { return r; }
732 /* loaded, but not resolved yet */
733 oc->status = OBJECT_LOADED;
738 /* -----------------------------------------------------------------------------
739 * resolve all the currently unlinked objects in memory
741 * Returns: 1 if ok, 0 on error.
749 for (oc = objects; oc; oc = oc->next) {
750 if (oc->status != OBJECT_RESOLVED) {
751 # if defined(OBJFORMAT_ELF)
752 r = ocResolve_ELF ( oc );
753 # elif defined(OBJFORMAT_PEi386)
754 r = ocResolve_PEi386 ( oc );
756 barf("resolveObjs: not implemented on this platform");
758 if (!r) { return r; }
759 oc->status = OBJECT_RESOLVED;
765 /* -----------------------------------------------------------------------------
766 * delete an object from the pool
769 unloadObj( char *path )
771 ObjectCode *oc, *prev;
773 ASSERT(symhash != NULL);
774 ASSERT(objects != NULL);
777 for (oc = objects; oc; prev = oc, oc = oc->next) {
778 if (!strcmp(oc->fileName,path)) {
780 /* Remove all the mappings for the symbols within this
785 for (i = 0; i < oc->n_symbols; i++) {
786 if (oc->symbols[i] != NULL) {
787 removeStrHashTable(symhash, oc->symbols[i], NULL);
795 prev->next = oc->next;
798 /* We're going to leave this in place, in case there are
799 any pointers from the heap into it: */
800 /* free(oc->image); */
804 /* The local hash table should have been freed at the end
805 of the ocResolve_ call on it. */
806 ASSERT(oc->lochash == NULL);
812 belch("unloadObj: can't find `%s' to unload", path);
816 /* -----------------------------------------------------------------------------
817 * Sanity checking. For each ObjectCode, maintain a list of address ranges
818 * which may be prodded during relocation, and abort if we try and write
819 * outside any of these.
821 static void addProddableBlock ( ObjectCode* oc, void* start, int size )
824 = stgMallocBytes(sizeof(ProddableBlock), "addProddableBlock");
825 /* fprintf(stderr, "aPB %p %p %d\n", oc, start, size); */
829 pb->next = oc->proddables;
833 static void checkProddableBlock ( ObjectCode* oc, void* addr )
836 for (pb = oc->proddables; pb != NULL; pb = pb->next) {
837 char* s = (char*)(pb->start);
838 char* e = s + pb->size - 1;
839 char* a = (char*)addr;
840 /* Assumes that the biggest fixup involves a 4-byte write. This
841 probably needs to be changed to 8 (ie, +7) on 64-bit
843 if (a >= s && (a+3) <= e) return;
845 barf("checkProddableBlock: invalid fixup in runtime linker");
848 /* -----------------------------------------------------------------------------
849 * Section management.
851 static void addSection ( ObjectCode* oc, SectionKind kind,
852 void* start, void* end )
854 Section* s = stgMallocBytes(sizeof(Section), "addSection");
858 s->next = oc->sections;
864 /* --------------------------------------------------------------------------
865 * PEi386 specifics (Win32 targets)
866 * ------------------------------------------------------------------------*/
868 /* The information for this linker comes from
869 Microsoft Portable Executable
870 and Common Object File Format Specification
871 revision 5.1 January 1998
872 which SimonM says comes from the MS Developer Network CDs.
876 #if defined(OBJFORMAT_PEi386)
880 typedef unsigned char UChar;
881 typedef unsigned short UInt16;
882 typedef unsigned int UInt32;
889 UInt16 NumberOfSections;
890 UInt32 TimeDateStamp;
891 UInt32 PointerToSymbolTable;
892 UInt32 NumberOfSymbols;
893 UInt16 SizeOfOptionalHeader;
894 UInt16 Characteristics;
898 #define sizeof_COFF_header 20
905 UInt32 VirtualAddress;
906 UInt32 SizeOfRawData;
907 UInt32 PointerToRawData;
908 UInt32 PointerToRelocations;
909 UInt32 PointerToLinenumbers;
910 UInt16 NumberOfRelocations;
911 UInt16 NumberOfLineNumbers;
912 UInt32 Characteristics;
916 #define sizeof_COFF_section 40
923 UInt16 SectionNumber;
926 UChar NumberOfAuxSymbols;
930 #define sizeof_COFF_symbol 18
935 UInt32 VirtualAddress;
936 UInt32 SymbolTableIndex;
941 #define sizeof_COFF_reloc 10
944 /* From PE spec doc, section 3.3.2 */
945 /* Note use of MYIMAGE_* since IMAGE_* are already defined in
946 windows.h -- for the same purpose, but I want to know what I'm
948 #define MYIMAGE_FILE_RELOCS_STRIPPED 0x0001
949 #define MYIMAGE_FILE_EXECUTABLE_IMAGE 0x0002
950 #define MYIMAGE_FILE_DLL 0x2000
951 #define MYIMAGE_FILE_SYSTEM 0x1000
952 #define MYIMAGE_FILE_BYTES_REVERSED_HI 0x8000
953 #define MYIMAGE_FILE_BYTES_REVERSED_LO 0x0080
954 #define MYIMAGE_FILE_32BIT_MACHINE 0x0100
956 /* From PE spec doc, section 5.4.2 and 5.4.4 */
957 #define MYIMAGE_SYM_CLASS_EXTERNAL 2
958 #define MYIMAGE_SYM_CLASS_STATIC 3
959 #define MYIMAGE_SYM_UNDEFINED 0
961 /* From PE spec doc, section 4.1 */
962 #define MYIMAGE_SCN_CNT_CODE 0x00000020
963 #define MYIMAGE_SCN_CNT_INITIALIZED_DATA 0x00000040
964 #define MYIMAGE_SCN_LNK_NRELOC_OVFL 0x01000000
966 /* From PE spec doc, section 5.2.1 */
967 #define MYIMAGE_REL_I386_DIR32 0x0006
968 #define MYIMAGE_REL_I386_REL32 0x0014
971 /* We use myindex to calculate array addresses, rather than
972 simply doing the normal subscript thing. That's because
973 some of the above structs have sizes which are not
974 a whole number of words. GCC rounds their sizes up to a
975 whole number of words, which means that the address calcs
976 arising from using normal C indexing or pointer arithmetic
977 are just plain wrong. Sigh.
980 myindex ( int scale, void* base, int index )
983 ((UChar*)base) + scale * index;
988 printName ( UChar* name, UChar* strtab )
990 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
991 UInt32 strtab_offset = * (UInt32*)(name+4);
992 fprintf ( stderr, "%s", strtab + strtab_offset );
995 for (i = 0; i < 8; i++) {
996 if (name[i] == 0) break;
997 fprintf ( stderr, "%c", name[i] );
1004 copyName ( UChar* name, UChar* strtab, UChar* dst, int dstSize )
1006 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
1007 UInt32 strtab_offset = * (UInt32*)(name+4);
1008 strncpy ( dst, strtab+strtab_offset, dstSize );
1014 if (name[i] == 0) break;
1024 cstring_from_COFF_symbol_name ( UChar* name, UChar* strtab )
1027 /* If the string is longer than 8 bytes, look in the
1028 string table for it -- this will be correctly zero terminated.
1030 if (name[0]==0 && name[1]==0 && name[2]==0 && name[3]==0) {
1031 UInt32 strtab_offset = * (UInt32*)(name+4);
1032 return ((UChar*)strtab) + strtab_offset;
1034 /* Otherwise, if shorter than 8 bytes, return the original,
1035 which by defn is correctly terminated.
1037 if (name[7]==0) return name;
1038 /* The annoying case: 8 bytes. Copy into a temporary
1039 (which is never freed ...)
1041 newstr = stgMallocBytes(9, "cstring_from_COFF_symbol_name");
1043 strncpy(newstr,name,8);
1049 /* Just compares the short names (first 8 chars) */
1050 static COFF_section *
1051 findPEi386SectionCalled ( ObjectCode* oc, char* name )
1055 = (COFF_header*)(oc->image);
1056 COFF_section* sectab
1058 ((UChar*)(oc->image))
1059 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
1061 for (i = 0; i < hdr->NumberOfSections; i++) {
1064 COFF_section* section_i
1066 myindex ( sizeof_COFF_section, sectab, i );
1067 n1 = (UChar*) &(section_i->Name);
1069 if (n1[0]==n2[0] && n1[1]==n2[1] && n1[2]==n2[2] &&
1070 n1[3]==n2[3] && n1[4]==n2[4] && n1[5]==n2[5] &&
1071 n1[6]==n2[6] && n1[7]==n2[7])
1080 zapTrailingAtSign ( UChar* sym )
1082 # define my_isdigit(c) ((c) >= '0' && (c) <= '9')
1084 if (sym[0] == 0) return;
1086 while (sym[i] != 0) i++;
1089 while (j > 0 && my_isdigit(sym[j])) j--;
1090 if (j > 0 && sym[j] == '@' && j != i) sym[j] = 0;
1096 ocVerifyImage_PEi386 ( ObjectCode* oc )
1101 COFF_section* sectab;
1102 COFF_symbol* symtab;
1104 /* fprintf(stderr, "\nLOADING %s\n", oc->fileName); */
1105 hdr = (COFF_header*)(oc->image);
1106 sectab = (COFF_section*) (
1107 ((UChar*)(oc->image))
1108 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
1110 symtab = (COFF_symbol*) (
1111 ((UChar*)(oc->image))
1112 + hdr->PointerToSymbolTable
1114 strtab = ((UChar*)symtab)
1115 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
1117 if (hdr->Machine != 0x14c) {
1118 belch("Not x86 PEi386");
1121 if (hdr->SizeOfOptionalHeader != 0) {
1122 belch("PEi386 with nonempty optional header");
1125 if ( /* (hdr->Characteristics & MYIMAGE_FILE_RELOCS_STRIPPED) || */
1126 (hdr->Characteristics & MYIMAGE_FILE_EXECUTABLE_IMAGE) ||
1127 (hdr->Characteristics & MYIMAGE_FILE_DLL) ||
1128 (hdr->Characteristics & MYIMAGE_FILE_SYSTEM) ) {
1129 belch("Not a PEi386 object file");
1132 if ( (hdr->Characteristics & MYIMAGE_FILE_BYTES_REVERSED_HI)
1133 /* || !(hdr->Characteristics & MYIMAGE_FILE_32BIT_MACHINE) */ ) {
1134 belch("Invalid PEi386 word size or endiannness: %d",
1135 (int)(hdr->Characteristics));
1138 /* If the string table size is way crazy, this might indicate that
1139 there are more than 64k relocations, despite claims to the
1140 contrary. Hence this test. */
1141 /* fprintf(stderr, "strtab size %d\n", * (UInt32*)strtab); */
1143 if ( (*(UInt32*)strtab) > 600000 ) {
1144 /* Note that 600k has no special significance other than being
1145 big enough to handle the almost-2MB-sized lumps that
1146 constitute HSwin32*.o. */
1147 belch("PEi386 object has suspiciously large string table; > 64k relocs?");
1152 /* No further verification after this point; only debug printing. */
1154 IF_DEBUG(linker, i=1);
1155 if (i == 0) return 1;
1158 "sectab offset = %d\n", ((UChar*)sectab) - ((UChar*)hdr) );
1160 "symtab offset = %d\n", ((UChar*)symtab) - ((UChar*)hdr) );
1162 "strtab offset = %d\n", ((UChar*)strtab) - ((UChar*)hdr) );
1164 fprintf ( stderr, "\n" );
1166 "Machine: 0x%x\n", (UInt32)(hdr->Machine) );
1168 "# sections: %d\n", (UInt32)(hdr->NumberOfSections) );
1170 "time/date: 0x%x\n", (UInt32)(hdr->TimeDateStamp) );
1172 "symtab offset: %d\n", (UInt32)(hdr->PointerToSymbolTable) );
1174 "# symbols: %d\n", (UInt32)(hdr->NumberOfSymbols) );
1176 "sz of opt hdr: %d\n", (UInt32)(hdr->SizeOfOptionalHeader) );
1178 "characteristics: 0x%x\n", (UInt32)(hdr->Characteristics) );
1180 /* Print the section table. */
1181 fprintf ( stderr, "\n" );
1182 for (i = 0; i < hdr->NumberOfSections; i++) {
1184 COFF_section* sectab_i
1186 myindex ( sizeof_COFF_section, sectab, i );
1193 printName ( sectab_i->Name, strtab );
1203 sectab_i->VirtualSize,
1204 sectab_i->VirtualAddress,
1205 sectab_i->SizeOfRawData,
1206 sectab_i->PointerToRawData,
1207 sectab_i->NumberOfRelocations,
1208 sectab_i->PointerToRelocations,
1209 sectab_i->PointerToRawData
1211 reltab = (COFF_reloc*) (
1212 ((UChar*)(oc->image)) + sectab_i->PointerToRelocations
1215 if ( sectab_i->Characteristics & MYIMAGE_SCN_LNK_NRELOC_OVFL ) {
1216 /* If the relocation field (a short) has overflowed, the
1217 * real count can be found in the first reloc entry.
1219 * See Section 4.1 (last para) of the PE spec (rev6.0).
1221 COFF_reloc* rel = (COFF_reloc*)
1222 myindex ( sizeof_COFF_reloc, reltab, 0 );
1223 noRelocs = rel->VirtualAddress;
1226 noRelocs = sectab_i->NumberOfRelocations;
1230 for (; j < noRelocs; j++) {
1232 COFF_reloc* rel = (COFF_reloc*)
1233 myindex ( sizeof_COFF_reloc, reltab, j );
1235 " type 0x%-4x vaddr 0x%-8x name `",
1237 rel->VirtualAddress );
1238 sym = (COFF_symbol*)
1239 myindex ( sizeof_COFF_symbol, symtab, rel->SymbolTableIndex );
1240 /* Hmm..mysterious looking offset - what's it for? SOF */
1241 printName ( sym->Name, strtab -10 );
1242 fprintf ( stderr, "'\n" );
1245 fprintf ( stderr, "\n" );
1247 fprintf ( stderr, "\n" );
1248 fprintf ( stderr, "string table has size 0x%x\n", * (UInt32*)strtab );
1249 fprintf ( stderr, "---START of string table---\n");
1250 for (i = 4; i < *(Int32*)strtab; i++) {
1252 fprintf ( stderr, "\n"); else
1253 fprintf( stderr, "%c", strtab[i] );
1255 fprintf ( stderr, "--- END of string table---\n");
1257 fprintf ( stderr, "\n" );
1260 COFF_symbol* symtab_i;
1261 if (i >= (Int32)(hdr->NumberOfSymbols)) break;
1262 symtab_i = (COFF_symbol*)
1263 myindex ( sizeof_COFF_symbol, symtab, i );
1269 printName ( symtab_i->Name, strtab );
1278 (Int32)(symtab_i->SectionNumber),
1279 (UInt32)symtab_i->Type,
1280 (UInt32)symtab_i->StorageClass,
1281 (UInt32)symtab_i->NumberOfAuxSymbols
1283 i += symtab_i->NumberOfAuxSymbols;
1287 fprintf ( stderr, "\n" );
1293 ocGetNames_PEi386 ( ObjectCode* oc )
1296 COFF_section* sectab;
1297 COFF_symbol* symtab;
1304 hdr = (COFF_header*)(oc->image);
1305 sectab = (COFF_section*) (
1306 ((UChar*)(oc->image))
1307 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
1309 symtab = (COFF_symbol*) (
1310 ((UChar*)(oc->image))
1311 + hdr->PointerToSymbolTable
1313 strtab = ((UChar*)(oc->image))
1314 + hdr->PointerToSymbolTable
1315 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
1317 /* Allocate space for any (local, anonymous) .bss sections. */
1319 for (i = 0; i < hdr->NumberOfSections; i++) {
1321 COFF_section* sectab_i
1323 myindex ( sizeof_COFF_section, sectab, i );
1324 if (0 != strcmp(sectab_i->Name, ".bss")) continue;
1325 if (sectab_i->VirtualSize == 0) continue;
1326 /* This is a non-empty .bss section. Allocate zeroed space for
1327 it, and set its PointerToRawData field such that oc->image +
1328 PointerToRawData == addr_of_zeroed_space. */
1329 zspace = stgCallocBytes(1, sectab_i->VirtualSize,
1330 "ocGetNames_PEi386(anonymous bss)");
1331 sectab_i->PointerToRawData = ((UChar*)zspace) - ((UChar*)(oc->image));
1332 addProddableBlock(oc, zspace, sectab_i->VirtualSize);
1333 /* fprintf(stderr, "BSS anon section at 0x%x\n", zspace); */
1336 /* Copy section information into the ObjectCode. */
1338 for (i = 0; i < hdr->NumberOfSections; i++) {
1344 = SECTIONKIND_OTHER;
1345 COFF_section* sectab_i
1347 myindex ( sizeof_COFF_section, sectab, i );
1348 IF_DEBUG(linker, belch("section name = %s\n", sectab_i->Name ));
1351 /* I'm sure this is the Right Way to do it. However, the
1352 alternative of testing the sectab_i->Name field seems to
1353 work ok with Cygwin.
1355 if (sectab_i->Characteristics & MYIMAGE_SCN_CNT_CODE ||
1356 sectab_i->Characteristics & MYIMAGE_SCN_CNT_INITIALIZED_DATA)
1357 kind = SECTIONKIND_CODE_OR_RODATA;
1360 if (0==strcmp(".text",sectab_i->Name) ||
1361 0==strcmp(".rodata",sectab_i->Name))
1362 kind = SECTIONKIND_CODE_OR_RODATA;
1363 if (0==strcmp(".data",sectab_i->Name) ||
1364 0==strcmp(".bss",sectab_i->Name))
1365 kind = SECTIONKIND_RWDATA;
1367 ASSERT(sectab_i->SizeOfRawData == 0 || sectab_i->VirtualSize == 0);
1368 sz = sectab_i->SizeOfRawData;
1369 if (sz < sectab_i->VirtualSize) sz = sectab_i->VirtualSize;
1371 start = ((UChar*)(oc->image)) + sectab_i->PointerToRawData;
1372 end = start + sz - 1;
1374 if (kind == SECTIONKIND_OTHER
1375 /* Ignore sections called which contain stabs debugging
1377 && 0 != strcmp(".stab", sectab_i->Name)
1378 && 0 != strcmp(".stabstr", sectab_i->Name)
1380 belch("Unknown PEi386 section name `%s'", sectab_i->Name);
1384 if (kind != SECTIONKIND_OTHER && end >= start) {
1385 addSection(oc, kind, start, end);
1386 addProddableBlock(oc, start, end - start + 1);
1390 /* Copy exported symbols into the ObjectCode. */
1392 oc->n_symbols = hdr->NumberOfSymbols;
1393 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
1394 "ocGetNames_PEi386(oc->symbols)");
1395 /* Call me paranoid; I don't care. */
1396 for (i = 0; i < oc->n_symbols; i++)
1397 oc->symbols[i] = NULL;
1401 COFF_symbol* symtab_i;
1402 if (i >= (Int32)(hdr->NumberOfSymbols)) break;
1403 symtab_i = (COFF_symbol*)
1404 myindex ( sizeof_COFF_symbol, symtab, i );
1408 if (symtab_i->StorageClass == MYIMAGE_SYM_CLASS_EXTERNAL
1409 && symtab_i->SectionNumber != MYIMAGE_SYM_UNDEFINED) {
1410 /* This symbol is global and defined, viz, exported */
1411 /* for MYIMAGE_SYMCLASS_EXTERNAL
1412 && !MYIMAGE_SYM_UNDEFINED,
1413 the address of the symbol is:
1414 address of relevant section + offset in section
1416 COFF_section* sectabent
1417 = (COFF_section*) myindex ( sizeof_COFF_section,
1419 symtab_i->SectionNumber-1 );
1420 addr = ((UChar*)(oc->image))
1421 + (sectabent->PointerToRawData
1425 if (symtab_i->SectionNumber == MYIMAGE_SYM_UNDEFINED
1426 && symtab_i->Value > 0) {
1427 /* This symbol isn't in any section at all, ie, global bss.
1428 Allocate zeroed space for it. */
1429 addr = stgCallocBytes(1, symtab_i->Value,
1430 "ocGetNames_PEi386(non-anonymous bss)");
1431 addSection(oc, SECTIONKIND_RWDATA, addr,
1432 ((UChar*)addr) + symtab_i->Value - 1);
1433 addProddableBlock(oc, addr, symtab_i->Value);
1434 /* fprintf(stderr, "BSS section at 0x%x\n", addr); */
1437 if (addr != NULL ) {
1438 sname = cstring_from_COFF_symbol_name ( symtab_i->Name, strtab );
1439 /* fprintf(stderr,"addSymbol %p `%s \n", addr,sname); */
1440 IF_DEBUG(linker, belch("addSymbol %p `%s'\n", addr,sname);)
1441 ASSERT(i >= 0 && i < oc->n_symbols);
1442 /* cstring_from_COFF_symbol_name always succeeds. */
1443 oc->symbols[i] = sname;
1444 ghciInsertStrHashTable(oc->fileName, symhash, sname, addr);
1448 "IGNORING symbol %d\n"
1452 printName ( symtab_i->Name, strtab );
1461 (Int32)(symtab_i->SectionNumber),
1462 (UInt32)symtab_i->Type,
1463 (UInt32)symtab_i->StorageClass,
1464 (UInt32)symtab_i->NumberOfAuxSymbols
1469 i += symtab_i->NumberOfAuxSymbols;
1478 ocResolve_PEi386 ( ObjectCode* oc )
1481 COFF_section* sectab;
1482 COFF_symbol* symtab;
1492 /* ToDo: should be variable-sized? But is at least safe in the
1493 sense of buffer-overrun-proof. */
1495 /* fprintf(stderr, "resolving for %s\n", oc->fileName); */
1497 hdr = (COFF_header*)(oc->image);
1498 sectab = (COFF_section*) (
1499 ((UChar*)(oc->image))
1500 + sizeof_COFF_header + hdr->SizeOfOptionalHeader
1502 symtab = (COFF_symbol*) (
1503 ((UChar*)(oc->image))
1504 + hdr->PointerToSymbolTable
1506 strtab = ((UChar*)(oc->image))
1507 + hdr->PointerToSymbolTable
1508 + hdr->NumberOfSymbols * sizeof_COFF_symbol;
1510 for (i = 0; i < hdr->NumberOfSections; i++) {
1511 COFF_section* sectab_i
1513 myindex ( sizeof_COFF_section, sectab, i );
1516 ((UChar*)(oc->image)) + sectab_i->PointerToRelocations
1519 /* Ignore sections called which contain stabs debugging
1521 if (0 == strcmp(".stab", sectab_i->Name)
1522 || 0 == strcmp(".stabstr", sectab_i->Name))
1525 if ( sectab_i->Characteristics & MYIMAGE_SCN_LNK_NRELOC_OVFL ) {
1526 /* If the relocation field (a short) has overflowed, the
1527 * real count can be found in the first reloc entry.
1529 * See Section 4.1 (last para) of the PE spec (rev6.0).
1531 COFF_reloc* rel = (COFF_reloc*)
1532 myindex ( sizeof_COFF_reloc, reltab, 0 );
1533 noRelocs = rel->VirtualAddress;
1534 fprintf(stderr, "Overflown relocs: %u\n", noRelocs);
1537 noRelocs = sectab_i->NumberOfRelocations;
1542 for (; j < noRelocs; j++) {
1544 COFF_reloc* reltab_j
1546 myindex ( sizeof_COFF_reloc, reltab, j );
1548 /* the location to patch */
1550 ((UChar*)(oc->image))
1551 + (sectab_i->PointerToRawData
1552 + reltab_j->VirtualAddress
1553 - sectab_i->VirtualAddress )
1555 /* the existing contents of pP */
1557 /* the symbol to connect to */
1558 sym = (COFF_symbol*)
1559 myindex ( sizeof_COFF_symbol,
1560 symtab, reltab_j->SymbolTableIndex );
1563 "reloc sec %2d num %3d: type 0x%-4x "
1564 "vaddr 0x%-8x name `",
1566 (UInt32)reltab_j->Type,
1567 reltab_j->VirtualAddress );
1568 printName ( sym->Name, strtab );
1569 fprintf ( stderr, "'\n" ));
1571 if (sym->StorageClass == MYIMAGE_SYM_CLASS_STATIC) {
1572 COFF_section* section_sym
1573 = findPEi386SectionCalled ( oc, sym->Name );
1575 belch("%s: can't find section `%s'", oc->fileName, sym->Name);
1578 S = ((UInt32)(oc->image))
1579 + (section_sym->PointerToRawData
1582 copyName ( sym->Name, strtab, symbol, 1000-1 );
1583 (void*)S = lookupLocalSymbol( oc, symbol );
1584 if ((void*)S != NULL) goto foundit;
1585 (void*)S = lookupSymbol( symbol );
1586 if ((void*)S != NULL) goto foundit;
1587 zapTrailingAtSign ( symbol );
1588 (void*)S = lookupLocalSymbol( oc, symbol );
1589 if ((void*)S != NULL) goto foundit;
1590 (void*)S = lookupSymbol( symbol );
1591 if ((void*)S != NULL) goto foundit;
1592 belch("%s: unknown symbol `%s'", oc->fileName, symbol);
1596 checkProddableBlock(oc, pP);
1597 switch (reltab_j->Type) {
1598 case MYIMAGE_REL_I386_DIR32:
1601 case MYIMAGE_REL_I386_REL32:
1602 /* Tricky. We have to insert a displacement at
1603 pP which, when added to the PC for the _next_
1604 insn, gives the address of the target (S).
1605 Problem is to know the address of the next insn
1606 when we only know pP. We assume that this
1607 literal field is always the last in the insn,
1608 so that the address of the next insn is pP+4
1609 -- hence the constant 4.
1610 Also I don't know if A should be added, but so
1611 far it has always been zero.
1614 *pP = S - ((UInt32)pP) - 4;
1617 belch("%s: unhandled PEi386 relocation type %d",
1618 oc->fileName, reltab_j->Type);
1625 IF_DEBUG(linker, belch("completed %s", oc->fileName));
1629 #endif /* defined(OBJFORMAT_PEi386) */
1632 /* --------------------------------------------------------------------------
1634 * ------------------------------------------------------------------------*/
1636 #if defined(OBJFORMAT_ELF)
1641 #if defined(sparc_TARGET_ARCH)
1642 # define ELF_TARGET_SPARC /* Used inside <elf.h> */
1643 #elif defined(i386_TARGET_ARCH)
1644 # define ELF_TARGET_386 /* Used inside <elf.h> */
1646 /* There is a similar case for IA64 in the Solaris2 headers if this
1647 * ever becomes relevant.
1654 findElfSection ( void* objImage, Elf32_Word sh_type )
1657 char* ehdrC = (char*)objImage;
1658 Elf32_Ehdr* ehdr = (Elf32_Ehdr*)ehdrC;
1659 Elf32_Shdr* shdr = (Elf32_Shdr*)(ehdrC + ehdr->e_shoff);
1660 char* sh_strtab = ehdrC + shdr[ehdr->e_shstrndx].sh_offset;
1662 for (i = 0; i < ehdr->e_shnum; i++) {
1663 if (shdr[i].sh_type == sh_type
1664 /* Ignore the section header's string table. */
1665 && i != ehdr->e_shstrndx
1666 /* Ignore string tables named .stabstr, as they contain
1668 && 0 != strncmp(".stabstr", sh_strtab + shdr[i].sh_name, 8)
1670 ptr = ehdrC + shdr[i].sh_offset;
1679 ocVerifyImage_ELF ( ObjectCode* oc )
1683 int i, j, nent, nstrtab, nsymtabs;
1687 char* ehdrC = (char*)(oc->image);
1688 Elf32_Ehdr* ehdr = ( Elf32_Ehdr*)ehdrC;
1690 if (ehdr->e_ident[EI_MAG0] != ELFMAG0 ||
1691 ehdr->e_ident[EI_MAG1] != ELFMAG1 ||
1692 ehdr->e_ident[EI_MAG2] != ELFMAG2 ||
1693 ehdr->e_ident[EI_MAG3] != ELFMAG3) {
1694 belch("%s: not an ELF header", oc->fileName);
1697 IF_DEBUG(linker,belch( "Is an ELF header" ));
1699 if (ehdr->e_ident[EI_CLASS] != ELFCLASS32) {
1700 belch("%s: not 32 bit ELF", oc->fileName);
1704 IF_DEBUG(linker,belch( "Is 32 bit ELF" ));
1706 if (ehdr->e_ident[EI_DATA] == ELFDATA2LSB) {
1707 IF_DEBUG(linker,belch( "Is little-endian" ));
1709 if (ehdr->e_ident[EI_DATA] == ELFDATA2MSB) {
1710 IF_DEBUG(linker,belch( "Is big-endian" ));
1712 belch("%s: unknown endiannness", oc->fileName);
1716 if (ehdr->e_type != ET_REL) {
1717 belch("%s: not a relocatable object (.o) file", oc->fileName);
1720 IF_DEBUG(linker, belch( "Is a relocatable object (.o) file" ));
1722 IF_DEBUG(linker,belch( "Architecture is " ));
1723 switch (ehdr->e_machine) {
1724 case EM_386: IF_DEBUG(linker,belch( "x86" )); break;
1725 case EM_SPARC: IF_DEBUG(linker,belch( "sparc" )); break;
1726 default: IF_DEBUG(linker,belch( "unknown" ));
1727 belch("%s: unknown architecture", oc->fileName);
1731 IF_DEBUG(linker,belch(
1732 "\nSection header table: start %d, n_entries %d, ent_size %d",
1733 ehdr->e_shoff, ehdr->e_shnum, ehdr->e_shentsize ));
1735 ASSERT (ehdr->e_shentsize == sizeof(Elf32_Shdr));
1737 shdr = (Elf32_Shdr*) (ehdrC + ehdr->e_shoff);
1739 if (ehdr->e_shstrndx == SHN_UNDEF) {
1740 belch("%s: no section header string table", oc->fileName);
1743 IF_DEBUG(linker,belch( "Section header string table is section %d",
1745 sh_strtab = ehdrC + shdr[ehdr->e_shstrndx].sh_offset;
1748 for (i = 0; i < ehdr->e_shnum; i++) {
1749 IF_DEBUG(linker,fprintf(stderr, "%2d: ", i ));
1750 IF_DEBUG(linker,fprintf(stderr, "type=%2d ", (int)shdr[i].sh_type ));
1751 IF_DEBUG(linker,fprintf(stderr, "size=%4d ", (int)shdr[i].sh_size ));
1752 IF_DEBUG(linker,fprintf(stderr, "offs=%4d ", (int)shdr[i].sh_offset ));
1753 IF_DEBUG(linker,fprintf(stderr, " (%p .. %p) ",
1754 ehdrC + shdr[i].sh_offset,
1755 ehdrC + shdr[i].sh_offset + shdr[i].sh_size - 1));
1757 if (shdr[i].sh_type == SHT_REL) {
1758 IF_DEBUG(linker,fprintf(stderr, "Rel " ));
1759 } else if (shdr[i].sh_type == SHT_RELA) {
1760 IF_DEBUG(linker,fprintf(stderr, "RelA " ));
1762 IF_DEBUG(linker,fprintf(stderr," "));
1765 IF_DEBUG(linker,fprintf(stderr, "sname=%s\n", sh_strtab + shdr[i].sh_name ));
1769 IF_DEBUG(linker,belch( "\nString tables" ));
1772 for (i = 0; i < ehdr->e_shnum; i++) {
1773 if (shdr[i].sh_type == SHT_STRTAB
1774 /* Ignore the section header's string table. */
1775 && i != ehdr->e_shstrndx
1776 /* Ignore string tables named .stabstr, as they contain
1778 && 0 != strncmp(".stabstr", sh_strtab + shdr[i].sh_name, 8)
1780 IF_DEBUG(linker,belch(" section %d is a normal string table", i ));
1781 strtab = ehdrC + shdr[i].sh_offset;
1786 belch("%s: no string tables, or too many", oc->fileName);
1791 IF_DEBUG(linker,belch( "\nSymbol tables" ));
1792 for (i = 0; i < ehdr->e_shnum; i++) {
1793 if (shdr[i].sh_type != SHT_SYMTAB) continue;
1794 IF_DEBUG(linker,belch( "section %d is a symbol table", i ));
1796 stab = (Elf32_Sym*) (ehdrC + shdr[i].sh_offset);
1797 nent = shdr[i].sh_size / sizeof(Elf32_Sym);
1798 IF_DEBUG(linker,belch( " number of entries is apparently %d (%d rem)",
1800 shdr[i].sh_size % sizeof(Elf32_Sym)
1802 if (0 != shdr[i].sh_size % sizeof(Elf32_Sym)) {
1803 belch("%s: non-integral number of symbol table entries", oc->fileName);
1806 for (j = 0; j < nent; j++) {
1807 IF_DEBUG(linker,fprintf(stderr, " %2d ", j ));
1808 IF_DEBUG(linker,fprintf(stderr, " sec=%-5d size=%-3d val=%5p ",
1809 (int)stab[j].st_shndx,
1810 (int)stab[j].st_size,
1811 (char*)stab[j].st_value ));
1813 IF_DEBUG(linker,fprintf(stderr, "type=" ));
1814 switch (ELF32_ST_TYPE(stab[j].st_info)) {
1815 case STT_NOTYPE: IF_DEBUG(linker,fprintf(stderr, "notype " )); break;
1816 case STT_OBJECT: IF_DEBUG(linker,fprintf(stderr, "object " )); break;
1817 case STT_FUNC : IF_DEBUG(linker,fprintf(stderr, "func " )); break;
1818 case STT_SECTION: IF_DEBUG(linker,fprintf(stderr, "section" )); break;
1819 case STT_FILE: IF_DEBUG(linker,fprintf(stderr, "file " )); break;
1820 default: IF_DEBUG(linker,fprintf(stderr, "? " )); break;
1822 IF_DEBUG(linker,fprintf(stderr, " " ));
1824 IF_DEBUG(linker,fprintf(stderr, "bind=" ));
1825 switch (ELF32_ST_BIND(stab[j].st_info)) {
1826 case STB_LOCAL : IF_DEBUG(linker,fprintf(stderr, "local " )); break;
1827 case STB_GLOBAL: IF_DEBUG(linker,fprintf(stderr, "global" )); break;
1828 case STB_WEAK : IF_DEBUG(linker,fprintf(stderr, "weak " )); break;
1829 default: IF_DEBUG(linker,fprintf(stderr, "? " )); break;
1831 IF_DEBUG(linker,fprintf(stderr, " " ));
1833 IF_DEBUG(linker,fprintf(stderr, "name=%s\n", strtab + stab[j].st_name ));
1837 if (nsymtabs == 0) {
1838 belch("%s: didn't find any symbol tables", oc->fileName);
1847 ocGetNames_ELF ( ObjectCode* oc )
1852 char* ehdrC = (char*)(oc->image);
1853 Elf32_Ehdr* ehdr = (Elf32_Ehdr*)ehdrC;
1854 char* strtab = findElfSection ( ehdrC, SHT_STRTAB );
1855 Elf32_Shdr* shdr = (Elf32_Shdr*) (ehdrC + ehdr->e_shoff);
1857 ASSERT(symhash != NULL);
1860 belch("%s: no strtab", oc->fileName);
1865 for (i = 0; i < ehdr->e_shnum; i++) {
1866 /* Figure out what kind of section it is. Logic derived from
1867 Figure 1.14 ("Special Sections") of the ELF document
1868 ("Portable Formats Specification, Version 1.1"). */
1869 Elf32_Shdr hdr = shdr[i];
1870 SectionKind kind = SECTIONKIND_OTHER;
1873 if (hdr.sh_type == SHT_PROGBITS
1874 && (hdr.sh_flags & SHF_ALLOC) && (hdr.sh_flags & SHF_EXECINSTR)) {
1875 /* .text-style section */
1876 kind = SECTIONKIND_CODE_OR_RODATA;
1879 if (hdr.sh_type == SHT_PROGBITS
1880 && (hdr.sh_flags & SHF_ALLOC) && (hdr.sh_flags & SHF_WRITE)) {
1881 /* .data-style section */
1882 kind = SECTIONKIND_RWDATA;
1885 if (hdr.sh_type == SHT_PROGBITS
1886 && (hdr.sh_flags & SHF_ALLOC) && !(hdr.sh_flags & SHF_WRITE)) {
1887 /* .rodata-style section */
1888 kind = SECTIONKIND_CODE_OR_RODATA;
1891 if (hdr.sh_type == SHT_NOBITS
1892 && (hdr.sh_flags & SHF_ALLOC) && (hdr.sh_flags & SHF_WRITE)) {
1893 /* .bss-style section */
1894 kind = SECTIONKIND_RWDATA;
1898 if (is_bss && shdr[i].sh_size > 0) {
1899 /* This is a non-empty .bss section. Allocate zeroed space for
1900 it, and set its .sh_offset field such that
1901 ehdrC + .sh_offset == addr_of_zeroed_space. */
1902 char* zspace = stgCallocBytes(1, shdr[i].sh_size,
1903 "ocGetNames_ELF(BSS)");
1904 shdr[i].sh_offset = ((char*)zspace) - ((char*)ehdrC);
1906 fprintf(stderr, "BSS section at 0x%x, size %d\n",
1907 zspace, shdr[i].sh_size);
1911 /* fill in the section info */
1912 addSection(oc, kind, ehdrC + shdr[i].sh_offset,
1913 ehdrC + shdr[i].sh_offset + shdr[i].sh_size - 1);
1914 if (kind != SECTIONKIND_OTHER && shdr[i].sh_size > 0)
1915 addProddableBlock(oc, ehdrC + shdr[i].sh_offset, shdr[i].sh_size);
1917 if (shdr[i].sh_type != SHT_SYMTAB) continue;
1919 /* copy stuff into this module's object symbol table */
1920 stab = (Elf32_Sym*) (ehdrC + shdr[i].sh_offset);
1921 nent = shdr[i].sh_size / sizeof(Elf32_Sym);
1923 oc->n_symbols = nent;
1924 oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
1925 "ocGetNames_ELF(oc->symbols)");
1927 for (j = 0; j < nent; j++) {
1929 char isLocal = FALSE; /* avoids uninit-var warning */
1931 char* nm = strtab + stab[j].st_name;
1932 int secno = stab[j].st_shndx;
1934 /* Figure out if we want to add it; if so, set ad to its
1935 address. Otherwise leave ad == NULL. */
1937 if (secno == SHN_COMMON) {
1939 ad = stgCallocBytes(1, stab[j].st_size, "ocGetNames_ELF(COMMON)");
1941 fprintf(stderr, "COMMON symbol, size %d name %s\n",
1942 stab[j].st_size, nm);
1944 /* Pointless to do addProddableBlock() for this area,
1945 since the linker should never poke around in it. */
1948 if ( ( ELF32_ST_BIND(stab[j].st_info)==STB_GLOBAL
1949 || ELF32_ST_BIND(stab[j].st_info)==STB_LOCAL
1951 /* and not an undefined symbol */
1952 && stab[j].st_shndx != SHN_UNDEF
1953 /* and not in a "special section" */
1954 && stab[j].st_shndx < SHN_LORESERVE
1956 /* and it's a not a section or string table or anything silly */
1957 ( ELF32_ST_TYPE(stab[j].st_info)==STT_FUNC ||
1958 ELF32_ST_TYPE(stab[j].st_info)==STT_OBJECT ||
1959 ELF32_ST_TYPE(stab[j].st_info)==STT_NOTYPE
1962 /* Section 0 is the undefined section, hence > and not >=. */
1963 ASSERT(secno > 0 && secno < ehdr->e_shnum);
1965 if (shdr[secno].sh_type == SHT_NOBITS) {
1966 fprintf(stderr, " BSS symbol, size %d off %d name %s\n",
1967 stab[j].st_size, stab[j].st_value, nm);
1970 ad = ehdrC + shdr[ secno ].sh_offset + stab[j].st_value;
1971 if (ELF32_ST_BIND(stab[j].st_info)==STB_LOCAL) {
1974 IF_DEBUG(linker,belch( "addOTabName(GLOB): %10p %s %s",
1975 ad, oc->fileName, nm ));
1980 /* And the decision is ... */
1984 oc->symbols[j] = nm;
1987 /* Ignore entirely. */
1989 ghciInsertStrHashTable(oc->fileName, symhash, nm, ad);
1993 IF_DEBUG(linker,belch( "skipping `%s'",
1994 strtab + stab[j].st_name ));
1997 "skipping bind = %d, type = %d, shndx = %d `%s'\n",
1998 (int)ELF32_ST_BIND(stab[j].st_info),
1999 (int)ELF32_ST_TYPE(stab[j].st_info),
2000 (int)stab[j].st_shndx,
2001 strtab + stab[j].st_name
2004 oc->symbols[j] = NULL;
2014 /* Do ELF relocations which lack an explicit addend. All x86-linux
2015 relocations appear to be of this form. */
2017 do_Elf32_Rel_relocations ( ObjectCode* oc, char* ehdrC,
2018 Elf32_Shdr* shdr, int shnum,
2019 Elf32_Sym* stab, char* strtab )
2024 Elf32_Rel* rtab = (Elf32_Rel*) (ehdrC + shdr[shnum].sh_offset);
2025 int nent = shdr[shnum].sh_size / sizeof(Elf32_Rel);
2026 int target_shndx = shdr[shnum].sh_info;
2027 int symtab_shndx = shdr[shnum].sh_link;
2028 stab = (Elf32_Sym*) (ehdrC + shdr[ symtab_shndx ].sh_offset);
2029 targ = (Elf32_Word*)(ehdrC + shdr[ target_shndx ].sh_offset);
2030 IF_DEBUG(linker,belch( "relocations for section %d using symtab %d",
2031 target_shndx, symtab_shndx ));
2032 for (j = 0; j < nent; j++) {
2033 Elf32_Addr offset = rtab[j].r_offset;
2034 Elf32_Word info = rtab[j].r_info;
2036 Elf32_Addr P = ((Elf32_Addr)targ) + offset;
2037 Elf32_Word* pP = (Elf32_Word*)P;
2041 IF_DEBUG(linker,belch( "Rel entry %3d is raw(%6p %6p)",
2042 j, (void*)offset, (void*)info ));
2044 IF_DEBUG(linker,belch( " ZERO" ));
2047 Elf32_Sym sym = stab[ELF32_R_SYM(info)];
2048 /* First see if it is a local symbol. */
2049 if (ELF32_ST_BIND(sym.st_info) == STB_LOCAL) {
2050 /* Yes, so we can get the address directly from the ELF symbol
2052 symbol = sym.st_name==0 ? "(noname)" : strtab+sym.st_name;
2054 (ehdrC + shdr[ sym.st_shndx ].sh_offset
2055 + stab[ELF32_R_SYM(info)].st_value);
2058 /* No, so look up the name in our global table. */
2059 symbol = strtab + sym.st_name;
2060 (void*)S = lookupSymbol( symbol );
2063 belch("%s: unknown symbol `%s'", oc->fileName, symbol);
2066 IF_DEBUG(linker,belch( "`%s' resolves to %p", symbol, (void*)S ));
2068 IF_DEBUG(linker,belch( "Reloc: P = %p S = %p A = %p",
2069 (void*)P, (void*)S, (void*)A ));
2070 checkProddableBlock ( oc, pP );
2071 switch (ELF32_R_TYPE(info)) {
2072 # ifdef i386_TARGET_ARCH
2073 case R_386_32: *pP = S + A; break;
2074 case R_386_PC32: *pP = S + A - P; break;
2077 belch("%s: unhandled ELF relocation(Rel) type %d\n",
2078 oc->fileName, ELF32_R_TYPE(info));
2087 /* Do ELF relocations for which explicit addends are supplied.
2088 sparc-solaris relocations appear to be of this form. */
2090 do_Elf32_Rela_relocations ( ObjectCode* oc, char* ehdrC,
2091 Elf32_Shdr* shdr, int shnum,
2092 Elf32_Sym* stab, char* strtab )
2097 Elf32_Rela* rtab = (Elf32_Rela*) (ehdrC + shdr[shnum].sh_offset);
2098 int nent = shdr[shnum].sh_size / sizeof(Elf32_Rela);
2099 int target_shndx = shdr[shnum].sh_info;
2100 int symtab_shndx = shdr[shnum].sh_link;
2101 stab = (Elf32_Sym*) (ehdrC + shdr[ symtab_shndx ].sh_offset);
2102 targ = (Elf32_Word*)(ehdrC + shdr[ target_shndx ].sh_offset);
2103 IF_DEBUG(linker,belch( "relocations for section %d using symtab %d",
2104 target_shndx, symtab_shndx ));
2105 for (j = 0; j < nent; j++) {
2106 Elf32_Addr offset = rtab[j].r_offset;
2107 Elf32_Word info = rtab[j].r_info;
2108 Elf32_Sword addend = rtab[j].r_addend;
2109 Elf32_Addr P = ((Elf32_Addr)targ) + offset;
2110 Elf32_Addr A = addend; /* Do not delete this; it is used on sparc. */
2112 # if defined(sparc_TARGET_ARCH)
2113 /* This #ifdef only serves to avoid unused-var warnings. */
2114 Elf32_Word* pP = (Elf32_Word*)P;
2118 IF_DEBUG(linker,belch( "Rel entry %3d is raw(%6p %6p %6p) ",
2119 j, (void*)offset, (void*)info,
2122 IF_DEBUG(linker,belch( " ZERO" ));
2125 Elf32_Sym sym = stab[ELF32_R_SYM(info)];
2126 /* First see if it is a local symbol. */
2127 if (ELF32_ST_BIND(sym.st_info) == STB_LOCAL) {
2128 /* Yes, so we can get the address directly from the ELF symbol
2130 symbol = sym.st_name==0 ? "(noname)" : strtab+sym.st_name;
2132 (ehdrC + shdr[ sym.st_shndx ].sh_offset
2133 + stab[ELF32_R_SYM(info)].st_value);
2136 /* No, so look up the name in our global table. */
2137 symbol = strtab + sym.st_name;
2138 (void*)S = lookupSymbol( symbol );
2141 belch("%s: unknown symbol `%s'", oc->fileName, symbol);
2145 fprintf ( stderr, "S %p A %p S+A %p S+A-P %p\n",S,A,S+A,S+A-P);
2148 IF_DEBUG(linker,belch( "`%s' resolves to %p", symbol, (void*)S ));
2150 IF_DEBUG(linker,fprintf ( stderr, "Reloc: P = %p S = %p A = %p\n",
2151 (void*)P, (void*)S, (void*)A ));
2152 checkProddableBlock ( oc, (void*)P );
2153 switch (ELF32_R_TYPE(info)) {
2154 # if defined(sparc_TARGET_ARCH)
2155 case R_SPARC_WDISP30:
2156 w1 = *pP & 0xC0000000;
2157 w2 = (Elf32_Word)((S + A - P) >> 2);
2158 ASSERT((w2 & 0xC0000000) == 0);
2163 w1 = *pP & 0xFFC00000;
2164 w2 = (Elf32_Word)((S + A) >> 10);
2165 ASSERT((w2 & 0xFFC00000) == 0);
2171 w2 = (Elf32_Word)((S + A) & 0x3FF);
2172 ASSERT((w2 & ~0x3FF) == 0);
2176 /* According to the Sun documentation:
2178 This relocation type resembles R_SPARC_32, except it refers to an
2179 unaligned word. That is, the word to be relocated must be treated
2180 as four separate bytes with arbitrary alignment, not as a word
2181 aligned according to the architecture requirements.
2183 (JRS: which means that freeloading on the R_SPARC_32 case
2184 is probably wrong, but hey ...)
2188 w2 = (Elf32_Word)(S + A);
2193 belch("%s: unhandled ELF relocation(RelA) type %d\n",
2194 oc->fileName, ELF32_R_TYPE(info));
2204 ocResolve_ELF ( ObjectCode* oc )
2208 Elf32_Sym* stab = NULL;
2209 char* ehdrC = (char*)(oc->image);
2210 Elf32_Ehdr* ehdr = (Elf32_Ehdr*) ehdrC;
2211 Elf32_Shdr* shdr = (Elf32_Shdr*) (ehdrC + ehdr->e_shoff);
2212 char* sh_strtab = ehdrC + shdr[ehdr->e_shstrndx].sh_offset;
2214 /* first find "the" symbol table */
2215 stab = (Elf32_Sym*) findElfSection ( ehdrC, SHT_SYMTAB );
2217 /* also go find the string table */
2218 strtab = findElfSection ( ehdrC, SHT_STRTAB );
2220 if (stab == NULL || strtab == NULL) {
2221 belch("%s: can't find string or symbol table", oc->fileName);
2225 /* Process the relocation sections. */
2226 for (shnum = 0; shnum < ehdr->e_shnum; shnum++) {
2228 /* Skip sections called ".rel.stab". These appear to contain
2229 relocation entries that, when done, make the stabs debugging
2230 info point at the right places. We ain't interested in all
2232 if (0 == strncmp(".rel.stab", sh_strtab + shdr[shnum].sh_name, 9))
2235 if (shdr[shnum].sh_type == SHT_REL ) {
2236 ok = do_Elf32_Rel_relocations ( oc, ehdrC, shdr,
2237 shnum, stab, strtab );
2241 if (shdr[shnum].sh_type == SHT_RELA) {
2242 ok = do_Elf32_Rela_relocations ( oc, ehdrC, shdr,
2243 shnum, stab, strtab );
2249 /* Free the local symbol table; we won't need it again. */
2250 freeHashTable(oc->lochash, NULL);