2 * Acess2 Dynamic Linker
3 * - By John Hodge (thePowersGang)
6 * - ELF32/ELF64 relocation
16 # define DEBUGS(v...) SysDebug("ld-acess - " v)
22 # define SUPPORT_ELF64
27 //static const char *csaDT_NAMES[] = {"DT_NULL", "DT_NEEDED", "DT_PLTRELSZ", "DT_PLTGOT", "DT_HASH", "DT_STRTAB", "DT_SYMTAB", "DT_RELA", "DT_RELASZ", "DT_RELAENT", "DT_STRSZ", "DT_SYMENT", "DT_INIT", "DT_FINI", "DT_SONAME", "DT_RPATH", "DT_SYMBOLIC", "DT_REL", "DT_RELSZ", "DT_RELENT", "DT_PLTREL", "DT_DEBUG", "DT_TEXTREL", "DT_JMPREL"};
28 static const char *csaR_NAMES[] = {"R_386_NONE", "R_386_32", "R_386_PC32", "R_386_GOT32", "R_386_PLT32", "R_386_COPY", "R_386_GLOB_DAT", "R_386_JMP_SLOT", "R_386_RELATIVE", "R_386_GOTOFF", "R_386_GOTPC", "R_386_LAST"};
32 void *ElfRelocate(void *Base, char **envp, const char *Filename);
33 int ElfGetSymbol(void *Base, const char *Name, void **Ret, size_t *Size);
34 void *Elf32Relocate(void *Base, char **envp, const char *Filename);
35 int Elf32GetSymbol(void *Base, const char *Name, void **Ret, size_t *Size);
37 void *Elf64Relocate(void *Base, char **envp, const char *Filename);
38 int Elf64GetSymbol(void *Base, const char *Name, void **Ret, size_t *Size);
40 uint32_t ElfHashString(const char *name);
44 * \fn int ElfRelocate(void *Base, char **envp, const char *Filename)
45 * \brief Relocates a loaded ELF Executable
47 void *ElfRelocate(void *Base, char **envp, const char *Filename)
49 Elf32_Ehdr *hdr = Base;
51 switch(hdr->e_ident[4])
54 return Elf32Relocate(Base, envp, Filename);
57 return Elf64Relocate(Base, envp, Filename);
60 SysDebug("ld-acess - ElfRelocate: Unknown file class %i", hdr->e_ident[4]);
66 * \fn int ElfGetSymbol(Uint Base, const char *name, void **ret)
68 int ElfGetSymbol(void *Base, const char *Name, void **ret, size_t *Size)
70 Elf32_Ehdr *hdr = Base;
72 switch(hdr->e_ident[4])
75 return Elf32GetSymbol(Base, Name, ret, Size);
78 return Elf64GetSymbol(Base, Name, ret, Size);
81 SysDebug("ld-acess - ElfRelocate: Unknown file class %i", hdr->e_ident[4]);
86 void *Elf32Relocate(void *Base, char **envp, const char *Filename)
88 Elf32_Ehdr *hdr = Base;
92 intptr_t iRealBase = -1;
96 Elf32_Rel *rel = NULL;
97 Elf32_Rela *rela = NULL;
99 int relSz=0, relEntSz=8;
100 int relaSz=0, relaEntSz=8;
101 int pltSz=0, pltType=0;
102 Elf32_Dyn *dynamicTab = NULL; // Dynamic Table Pointer
103 char *dynstrtab = NULL; // .dynamic String Table
104 Elf32_Sym *dynsymtab;
105 void (*do_relocate)(uint32_t t_info, uint32_t *ptr, Elf32_Addr addend, int Type, int bRela, const char *Sym);
107 DEBUGS("ElfRelocate: (Base=0x%x)", Base);
109 // Check magic header
112 // Parse Program Header to get Dynamic Table
113 phtab = Base + hdr->phoff;
114 iSegmentCount = hdr->phentcount;
115 for(i=0;i<iSegmentCount;i++)
117 // Determine linked base address
118 if(phtab[i].Type == PT_LOAD && iRealBase > phtab[i].VAddr)
119 iRealBase = phtab[i].VAddr;
121 // Find Dynamic Section
122 if(phtab[i].Type == PT_DYNAMIC) {
124 DEBUGS(" WARNING - elf_relocate: Multiple PT_DYNAMIC segments");
127 dynamicTab = (void *) (intptr_t) phtab[i].VAddr;
128 j = i; // Save Dynamic Table ID
132 // Page Align real base
134 DEBUGS(" elf_relocate: True Base = 0x%x, Compiled Base = 0x%x", Base, iRealBase);
136 // Adjust "Real" Base
137 iBaseDiff = (intptr_t)Base - iRealBase;
139 // hdr->entrypoint += iBaseDiff; // Adjust Entrypoint
141 // Check if a PT_DYNAMIC segement was found
143 SysDebug(" elf_relocate: No PT_DYNAMIC segment in image %p, returning", Base);
144 return (void *)(intptr_t)(hdr->entrypoint + iBaseDiff);
147 // Adjust Dynamic Table
148 dynamicTab = (void *)( (intptr_t)dynamicTab + iBaseDiff );
150 // === Get Symbol table and String Table ===
151 for( j = 0; dynamicTab[j].d_tag != DT_NULL; j++)
153 switch(dynamicTab[j].d_tag)
155 // --- Symbol Table ---
157 DEBUGS(" elf_relocate: DYNAMIC Symbol Table 0x%x (0x%x)",
158 dynamicTab[j].d_val, dynamicTab[j].d_val + iBaseDiff);
159 if(iBaseDiff != 0) dynamicTab[j].d_val += iBaseDiff;
160 dynsymtab = (void*)(intptr_t)dynamicTab[j].d_val;
162 // --- String Table ---
164 DEBUGS(" elf_relocate: DYNAMIC String Table 0x%x (0x%x)",
165 dynamicTab[j].d_val, dynamicTab[j].d_val + iBaseDiff);
166 if(iBaseDiff != 0) dynamicTab[j].d_val += iBaseDiff;
167 dynstrtab = (void*)(intptr_t)dynamicTab[j].d_val;
171 if(iBaseDiff != 0) dynamicTab[j].d_val += iBaseDiff;
172 // iSymCount = ((Elf32_Word*)(intptr_t)dynamicTab[j].d_val)[1];
177 if(dynsymtab == NULL) {
178 SysDebug("ld-acess.so - WARNING: No Dynamic Symbol table in %p, returning", hdr);
179 return (void *)(intptr_t) (hdr->entrypoint + iBaseDiff);
182 // === Add to loaded list (can be imported now) ===
183 AddLoaded( Filename, Base );
185 // === Parse Relocation Data ===
186 DEBUGS(" elf_relocate: dynamicTab = 0x%x", dynamicTab);
187 for( j = 0; dynamicTab[j].d_tag != DT_NULL; j++)
189 switch(dynamicTab[j].d_tag)
191 // --- Shared Library Name ---
193 DEBUGS(" elf_relocate: .so Name '%s'", dynstrtab+dynamicTab[j].d_val);
195 // --- Needed Library ---
197 libPath = dynstrtab + dynamicTab[j].d_val;
198 DEBUGS(" Required Library '%s'", libPath);
199 if(LoadLibrary(libPath, NULL, envp) == 0) {
201 DEBUGS(" elf_relocate: Unable to load '%s'", libPath);
203 SysDebug("Unable to load required library '%s'", libPath);
207 DEBUGS(" Lib loaded");
210 // case DT_PLTGOT: pltgot = (void*)(iBaseDiff + dynamicTab[j].d_val); break;
211 case DT_JMPREL: plt = (void*)(iBaseDiff + dynamicTab[j].d_val); break;
212 case DT_PLTREL: pltType = dynamicTab[j].d_val; break;
213 case DT_PLTRELSZ: pltSz = dynamicTab[j].d_val; break;
215 // --- Relocation ---
216 case DT_REL: rel = (void*)(iBaseDiff + dynamicTab[j].d_val); break;
217 case DT_RELSZ: relSz = dynamicTab[j].d_val; break;
218 case DT_RELENT: relEntSz = dynamicTab[j].d_val; break;
219 case DT_RELA: rela = (void*)(iBaseDiff + dynamicTab[j].d_val); break;
220 case DT_RELASZ: relaSz = dynamicTab[j].d_val; break;
221 case DT_RELAENT: relaEntSz = dynamicTab[j].d_val; break;
223 // --- Symbol Table ---
225 // --- Hash Table ---
227 // --- String Table ---
233 if(dynamicTab[j].d_tag > DT_JMPREL) continue;
234 //DEBUGS(" elf_relocate: %i-%i = %s,0x%x",
235 // i,j, csaDT_NAMES[dynamicTab[j].d_tag],dynamicTab[j].d_val);
240 DEBUGS(" elf_relocate: Beginning Relocation");
242 void elf_doRelocate_386(uint32_t r_info, uint32_t *ptr, Elf32_Addr addend, int type, int bRela, const char *Sym)
247 // Standard 32 Bit Relocation (S+A)
249 val = (intptr_t) GetSymbol(Sym, NULL);
250 DEBUGS(" elf_doRelocate: R_386_32 *0x%x += 0x%x('%s')",
255 // 32 Bit Relocation wrt. Offset (S+A-P)
257 DEBUGS(" elf_doRelocate: '%s'", Sym);
258 val = (intptr_t) GetSymbol(Sym, NULL);
259 DEBUGS(" elf_doRelocate: R_386_PC32 *0x%x = 0x%x + 0x%x - 0x%x",
260 ptr, *ptr, val, (intptr_t)ptr );
261 *ptr = val + addend - (intptr_t)ptr;
262 //*ptr = val + addend - ((Uint)ptr - iBaseDiff);
265 // Absolute Value of a symbol (S)
268 DEBUGS(" elf_doRelocate: '%s'", Sym);
269 val = (intptr_t) GetSymbol( Sym, NULL );
270 DEBUGS(" elf_doRelocate: %s *0x%x = 0x%x", csaR_NAMES[type], ptr, val);
274 // Base Address (B+A)
276 DEBUGS(" elf_doRelocate: R_386_RELATIVE *0x%x = 0x%x + 0x%x", ptr, iBaseDiff, addend);
277 *ptr = iBaseDiff + addend;
282 void *src = GetSymbol(Sym, &size);
283 DEBUGS(" elf_doRelocate_386: R_386_COPY (%p, %p, %i)", ptr, src, size);
284 memcpy(ptr, src, size);
288 SysDebug("elf_doRelocate_386: Unknown relocation %i", type);
293 void elf_doRelocate_arm(uint32_t r_info, uint32_t *ptr, Elf32_Addr addend, int type, int bRela, const char *Sym)
300 DEBUGS(" elf_doRelocate_arm: R_ARM_GLOB_DAT %p (%s + %x)", ptr, Sym, addend);
301 val = (intptr_t)GetSymbol(Sym, NULL);
304 case R_ARM_JUMP_SLOT:
305 if(!bRela) addend = 0;
306 DEBUGS(" elf_doRelocate_arm: R_ARM_JUMP_SLOT %p (%s + %x)", ptr, Sym, addend);
307 val = (intptr_t)GetSymbol(Sym, NULL);
312 void *src = GetSymbol(Sym, &size);
313 DEBUGS(" elf_doRelocate_arm: R_ARM_COPY (%p, %p, %i)", ptr, src, size);
314 memcpy(ptr, src, size);
317 SysDebug("elf_doRelocate_arm: Unknown Relocation, %i", type);
322 void _doRelocate(uint32_t r_info, uint32_t *ptr, int bRela, Elf32_Addr addend)
324 int type = ELF32_R_TYPE(r_info);
325 int sym = ELF32_R_SYM(r_info);
326 const char *symname = dynstrtab + dynsymtab[sym].nameOfs;
327 do_relocate(r_info, ptr, addend, type, bRela, symname);
333 do_relocate = elf_doRelocate_386;
336 do_relocate = elf_doRelocate_arm;
339 SysDebug("Elf32Relocate: Unknown machine type %i", hdr->machine);
343 // Parse Relocation Entries
347 DEBUGS(" elf_relocate: rel=0x%x, relSz=0x%x, relEntSz=0x%x", rel, relSz, relEntSz);
348 j = relSz / relEntSz;
349 for( i = 0; i < j; i++ )
351 //DEBUGS(" Rel %i: 0x%x+0x%x", i, iBaseDiff, rel[i].r_offset);
352 ptr = (void*)(iBaseDiff + rel[i].r_offset);
353 _doRelocate(rel[i].r_info, ptr, 0, *ptr);
356 // Parse Relocation Entries
360 DEBUGS(" elf_relocate: rela=0x%x, relaSz=0x%x, relaEntSz=0x%x", rela, relaSz, relaEntSz);
361 j = relaSz / relaEntSz;
362 for( i = 0; i < j; i++ )
364 ptr = (void*)(iBaseDiff + rela[i].r_offset);
365 _doRelocate(rel[i].r_info, ptr, 1, rela[i].r_addend);
369 // === Process PLT (Procedure Linkage Table) ===
373 DEBUGS(" elf_relocate: Relocate PLT, plt=0x%x", plt);
374 if(pltType == DT_REL)
376 Elf32_Rel *pltRel = plt;
377 j = pltSz / sizeof(Elf32_Rel);
378 DEBUGS(" elf_relocate: PLT Reloc Type = Rel, %i entries", j);
381 ptr = (void*)(iBaseDiff + pltRel[i].r_offset);
382 _doRelocate(pltRel[i].r_info, ptr, 0, *ptr);
387 Elf32_Rela *pltRela = plt;
388 j = pltSz / sizeof(Elf32_Rela);
389 DEBUGS(" elf_relocate: PLT Reloc Type = Rela, %i entries", j);
392 ptr = (void*)(iRealBase + pltRela[i].r_offset);
393 _doRelocate(pltRela[i].r_info, ptr, 1, pltRela[i].r_addend);
398 DEBUGS("ElfRelocate: RETURN 0x%x to %p", hdr->entrypoint + iBaseDiff, __builtin_return_address(0));
399 return (void*)(intptr_t)( hdr->entrypoint + iBaseDiff );
402 int Elf32GetSymbol(void *Base, const char *Name, void **ret, size_t *Size)
404 Elf32_Ehdr *hdr = Base;
407 // int iSymCount = 0;
409 Elf32_Word *pBuckets;
412 const char *dynstrtab;
413 uintptr_t iBaseDiff = -1;
415 Elf32_Dyn *dynTab = NULL;
418 phtab = (void*)( Base + hdr->phoff );
419 for( i = 0; i < hdr->phentcount; i ++ )
421 if(phtab[i].Type == PT_LOAD && iBaseDiff > phtab[i].VAddr)
422 iBaseDiff = phtab[i].VAddr;
423 if( phtab[i].Type == PT_DYNAMIC ) {
424 dynTab = (void*)(intptr_t)phtab[i].VAddr;
428 SysDebug("ERROR - Unable to find DYNAMIC segment in %p", Base);
431 iBaseDiff = (intptr_t)Base - iBaseDiff; // Make iBaseDiff actually the diff
432 dynTab = (void*)( (intptr_t)dynTab + iBaseDiff );
433 for( i = 0; dynTab[i].d_tag != DT_NULL; i++)
435 switch(dynTab[i].d_tag)
437 // --- Symbol Table ---
439 symtab = (void*)(intptr_t) dynTab[i].d_val; // Rebased in Relocate
442 dynstrtab = (void*)(intptr_t) dynTab[i].d_val;
446 pBuckets = (void*)(intptr_t) dynTab[i].d_val;
451 nbuckets = pBuckets[0];
452 // iSymCount = pBuckets[1];
453 pBuckets = &pBuckets[2];
454 pChains = &pBuckets[ nbuckets ];
457 iNameHash = ElfHashString(Name);
458 iNameHash %= nbuckets;
461 i = pBuckets[ iNameHash ];
462 if(symtab[i].shndx != SHN_UNDEF && strcmp(dynstrtab + symtab[i].nameOfs, Name) == 0) {
463 *ret = (void*) (intptr_t) symtab[ i ].value + iBaseDiff;
464 if(Size) *Size = symtab[i].size;
468 while(pChains[i] != STN_UNDEF)
471 if(symtab[i].shndx != SHN_UNDEF && strcmp(dynstrtab + symtab[ i ].nameOfs, Name) == 0) {
472 *ret = (void*)(intptr_t)symtab[ i ].value + iBaseDiff;
473 if(Size) *Size = symtab[i].size;
482 void *Elf64Relocate(void *Base, char **envp, const char *Filename)
485 Elf64_Ehdr *hdr = Base;
488 Elf64_Addr compiledBase = -1, baseDiff;
489 Elf64_Sym *symtab = NULL;
491 Elf64_Word *hashtab = NULL;
492 Elf64_Rel *rel = NULL;
494 Elf64_Rela *rela = NULL;
497 int plt_size = 0, plt_type = 0;
499 DEBUGS("Elf64Relocate: hdr = {");
500 DEBUGS("Elf64Relocate: e_ident = '%.16s'", hdr->e_ident);
501 DEBUGS("Elf64Relocate: e_type = 0x%x", hdr->e_type);
502 DEBUGS("Elf64Relocate: e_machine = 0x%x", hdr->e_machine);
503 DEBUGS("Elf64Relocate: e_version = 0x%x", hdr->e_version);
504 DEBUGS("Elf64Relocate: e_entry = %p", hdr->e_entry);
505 DEBUGS("Elf64Relocate: e_phoff = 0x%llx", hdr->e_phoff);
506 DEBUGS("Elf64Relocate: e_shoff = 0x%llx", hdr->e_shoff);
507 DEBUGS("Elf64Relocate: e_flags = 0x%x", hdr->e_flags);
508 DEBUGS("Elf64Relocate: e_ehsize = 0x%x", hdr->e_ehsize);
509 DEBUGS("Elf64Relocate: e_phentsize = 0x%x", hdr->e_phentsize);
510 DEBUGS("Elf64Relocate: e_phnum = %i", hdr->e_phnum);
512 // Scan for the dynamic table (and find the compiled base)
513 phtab = Base + hdr->e_phoff;
514 for( i = 0; i < hdr->e_phnum; i ++ )
516 if(phtab[i].p_type == PT_DYNAMIC)
517 dyntab = (void *)(intptr_t)phtab[i].p_vaddr;
518 if(phtab[i].p_type == PT_LOAD && compiledBase > phtab[i].p_vaddr)
519 compiledBase = phtab[i].p_vaddr;
522 baseDiff = (uintptr_t)Base - compiledBase;
524 DEBUGS("baseDiff = %p", baseDiff);
527 SysDebug(" Elf64Relocate: No PT_DYNAMIC segment in image %p, returning", Base);
528 return (void *)(uintptr_t)(hdr->e_entry + baseDiff);
531 dyntab = (void *)(uintptr_t)((uintptr_t)dyntab + baseDiff);
533 // Parse the dynamic table (first pass)
534 // - Search for String, Symbol and Hash tables
535 for(i = 0; dyntab[i].d_tag != DT_NULL; i ++)
537 switch(dyntab[i].d_tag)
540 dyntab[i].d_un.d_ptr += baseDiff;
541 symtab = (void *)(uintptr_t)dyntab[i].d_un.d_ptr;
544 dyntab[i].d_un.d_ptr += baseDiff;
545 strtab = (void *)(uintptr_t)dyntab[i].d_un.d_ptr;
548 dyntab[i].d_un.d_ptr += baseDiff;
549 hashtab = (void *)(uintptr_t)dyntab[i].d_un.d_ptr;
554 if( !symtab || !strtab || !hashtab ) {
555 SysDebug("ld-acess - Elf64Relocate: Missing Symbol, string or hash table");
559 // Ready for symbol use
560 AddLoaded( Filename, Base );
562 // Second pass on dynamic table
563 for(i = 0; dyntab[i].d_tag != DT_NULL; i ++)
565 DEBUGS("dyntab[%i].d_tag = %i", i, dyntab[i].d_tag);
566 switch(dyntab[i].d_tag)
568 case DT_SONAME: break;
571 char *libPath = strtab + dyntab[i].d_un.d_val;
572 DEBUGS("Elf64Relocate: libPath = '%s'", libPath);
573 if(LoadLibrary(libPath, NULL, envp) == 0) {
574 SysDebug("ld-acess - Elf64Relocate: Unable to load '%s'", libPath);
579 // Relocation entries
581 dyntab[i].d_un.d_ptr += baseDiff;
582 rel = (void *)(uintptr_t)dyntab[i].d_un.d_ptr;
585 rel_count = dyntab[i].d_un.d_val / sizeof(Elf64_Rel);
588 if( dyntab[i].d_un.d_val != sizeof(Elf64_Rel) ) {
589 SysDebug("ld-acess - Elf64Relocate: DT_RELENT(%i) != sizeof(Elf64_Rel)(%i)",
590 dyntab[i].d_un.d_val, sizeof(Elf64_Rel));
595 dyntab[i].d_un.d_ptr += baseDiff;
596 rela = (void *)(uintptr_t)dyntab[i].d_un.d_ptr;
599 rela_count = dyntab[i].d_un.d_val / sizeof(Elf64_Rela);
602 if( dyntab[i].d_un.d_val != sizeof(Elf64_Rela) ) {
603 SysDebug("ld-acess - Elf64Relocate: DT_RELAENT(%i) != sizeof(Elf64_Rela)(%i)",
604 dyntab[i].d_un.d_val, sizeof(Elf64_Rela));
609 dyntab[i].d_un.d_ptr += baseDiff;
610 pltrel = (void *)(uintptr_t)dyntab[i].d_un.d_ptr;
613 plt_type = dyntab[i].d_un.d_val;
616 plt_size = dyntab[i].d_un.d_val;
621 // Relocation function
622 void _Elf64DoReloc(Elf64_Xword r_info, void *ptr, Elf64_Sxword addend)
624 int sym = ELF64_R_SYM(r_info);
625 int type = ELF64_R_TYPE(r_info);
626 const char *symname = strtab + symtab[sym].st_name;
632 *(uint64_t*)ptr = (uintptr_t)GetSymbol(symname, NULL) + addend;
634 case R_X86_64_COPY: {
636 void *sym = GetSymbol(symname, &size);
637 memcpy(ptr, sym, size);
639 case R_X86_64_GLOB_DAT:
640 *(uint64_t*)ptr = (uintptr_t)GetSymbol(symname, NULL);
642 case R_X86_64_JUMP_SLOT:
643 *(uint64_t*)ptr = (uintptr_t)GetSymbol(symname, NULL);
645 case R_X86_64_RELATIVE:
646 *(uint64_t*)ptr = (uintptr_t)Base + addend;
649 SysDebug("ld-acess - _Elf64DoReloc: Unknown relocation type %i", type);
656 DEBUGS("rel_count = %i", rel_count);
657 for( i = 0; i < rel_count; i ++ )
659 uint64_t *ptr = (void *)(uintptr_t)( rel[i].r_offset + baseDiff );
660 _Elf64DoReloc( rel[i].r_info, ptr, *ptr);
666 DEBUGS("rela_count = %i", rela_count);
667 for( i = 0; i < rela_count; i ++ )
669 uint64_t *ptr = (void *)(uintptr_t)( rela[i].r_offset + baseDiff );
670 _Elf64DoReloc( rela[i].r_info, ptr, rela[i].r_addend );
674 if( pltrel && plt_type )
676 if( plt_type == DT_REL ) {
677 Elf64_Rel *plt = pltrel;
678 int count = plt_size / sizeof(Elf64_Rel);
679 DEBUGS("plt rel count = %i", count);
680 for( i = 0; i < count; i ++ )
682 uint64_t *ptr = (void *)(uintptr_t)( plt[i].r_offset + baseDiff );
683 _Elf64DoReloc( plt[i].r_info, ptr, *ptr);
687 Elf64_Rela *plt = pltrel;
688 int count = plt_size / sizeof(Elf64_Rela);
689 DEBUGS("plt rela count = %i", count);
690 for( i = 0; i < count; i ++ )
692 uint64_t *ptr = (void *)(uintptr_t)( plt[i].r_offset + baseDiff );
693 _Elf64DoReloc( plt[i].r_info, ptr, plt[i].r_addend);
699 void *ret = (void *)(uintptr_t)(hdr->e_entry + baseDiff);
700 DEBUGS("Elf64Relocate: Relocations done, return %p", ret);
705 int Elf64GetSymbol(void *Base, const char *Name, void **Ret, size_t *Size)
707 Elf64_Ehdr *hdr = Base;
710 // int iSymCount = 0;
712 Elf64_Word *pBuckets;
715 const char *dynstrtab;
716 uintptr_t iBaseDiff = -1;
722 // Catch the current executable
726 Elf64_Dyn *dynTab = NULL;
730 phtab = (void*)( Base + hdr->e_phoff );
731 for( i = 0; i < hdr->e_phnum; i ++ )
733 if(phtab[i].p_type == PT_LOAD && iBaseDiff > phtab[i].p_vaddr)
734 iBaseDiff = phtab[i].p_vaddr;
735 if( phtab[i].p_type == PT_DYNAMIC ) {
736 dynTab = (void*)(intptr_t)phtab[i].p_vaddr;
740 SysDebug("ERROR - Unable to find DYNAMIC segment in %p", Base);
743 iBaseDiff = (intptr_t)Base - iBaseDiff; // Make iBaseDiff actually the diff
744 dynTab = (void*)( (intptr_t)dynTab + iBaseDiff );
746 for( j = 0; dynTab[j].d_tag != DT_NULL; j++)
748 switch(dynTab[j].d_tag)
750 // --- Symbol Table ---
752 symtab = (void*)(intptr_t) dynTab[j].d_un.d_val; // Rebased in Relocate
755 dynstrtab = (void*)(intptr_t) dynTab[j].d_un.d_val;
759 pBuckets = (void*)(intptr_t) dynTab[j].d_un.d_val;
765 nbuckets = pBuckets[0];
766 // iSymCount = pBuckets[1];
767 pBuckets = &pBuckets[2];
768 pChains = &pBuckets[ nbuckets ];
771 iNameHash = ElfHashString(Name);
772 iNameHash %= nbuckets;
775 i = pBuckets[ iNameHash ];
776 if(symtab[i].st_shndx != SHN_UNDEF && strcmp(dynstrtab + symtab[i].st_name, Name) == 0) {
777 *Ret = (void*) (intptr_t) symtab[i].st_value + iBaseDiff;
778 if(Size) *Size = symtab[i].st_size;
779 DEBUGS("%s = %p", Name, *Ret);
783 while(pChains[i] != STN_UNDEF)
786 if(symtab[i].st_shndx != SHN_UNDEF && strcmp(dynstrtab + symtab[i].st_name, Name) == 0) {
787 *Ret = (void*)(intptr_t)symtab[i].st_value + iBaseDiff;
788 if(Size) *Size = symtab[i].st_size;
789 DEBUGS("%s = %p", Name, *Ret);
799 uint32_t ElfHashString(const char *name)
804 h = (h << 4) + *(uint8_t*)name++;
805 if( (g = h & 0xf0000000) )