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);
36 void elf_doRelocate_386(uint32_t r_info, uint32_t *ptr, Elf32_Addr addend, int type, int bRela, const char *Sym, intptr_t iBaseDiff);
37 void elf_doRelocate_arm(uint32_t r_info, uint32_t *ptr, Elf32_Addr addend, int type, int bRela, const char *Sym, intptr_t iBaseDiff);
39 void *Elf64Relocate(void *Base, char **envp, const char *Filename);
40 int Elf64GetSymbol(void *Base, const char *Name, void **Ret, size_t *Size);
42 uint32_t ElfHashString(const char *name);
46 * \fn int ElfRelocate(void *Base, char **envp, const char *Filename)
47 * \brief Relocates a loaded ELF Executable
49 void *ElfRelocate(void *Base, char **envp, const char *Filename)
51 Elf32_Ehdr *hdr = Base;
53 switch(hdr->e_ident[4])
56 return Elf32Relocate(Base, envp, Filename);
59 return Elf64Relocate(Base, envp, Filename);
62 SysDebug("ld-acess - ElfRelocate: Unknown file class %i", hdr->e_ident[4]);
68 * \fn int ElfGetSymbol(Uint Base, const char *name, void **ret)
70 int ElfGetSymbol(void *Base, const char *Name, void **ret, size_t *Size)
72 Elf32_Ehdr *hdr = Base;
74 switch(hdr->e_ident[4])
77 return Elf32GetSymbol(Base, Name, ret, Size);
80 return Elf64GetSymbol(Base, Name, ret, Size);
83 SysDebug("ld-acess - ElfRelocate: Unknown file class %i", hdr->e_ident[4]);
88 void elf_doRelocate_386(uint32_t r_info, uint32_t *ptr, Elf32_Addr addend, int type, int bRela, const char *Sym, intptr_t iBaseDiff)
93 // Standard 32 Bit Relocation (S+A)
95 val = (intptr_t) GetSymbol(Sym, NULL);
96 DEBUGS(" elf_doRelocate: R_386_32 *0x%x += 0x%x('%s')",
101 // 32 Bit Relocation wrt. Offset (S+A-P)
103 DEBUGS(" elf_doRelocate: '%s'", Sym);
104 val = (intptr_t) GetSymbol(Sym, NULL);
105 DEBUGS(" elf_doRelocate: R_386_PC32 *0x%x = 0x%x + 0x%x - 0x%x",
106 ptr, *ptr, val, (intptr_t)ptr );
107 *ptr = val + addend - (intptr_t)ptr;
108 //*ptr = val + addend - ((Uint)ptr - iBaseDiff);
111 // Absolute Value of a symbol (S)
114 DEBUGS(" elf_doRelocate: '%s'", Sym);
115 val = (intptr_t) GetSymbol( Sym, NULL );
116 DEBUGS(" elf_doRelocate: %s *0x%x = 0x%x", csaR_NAMES[type], ptr, val);
120 // Base Address (B+A)
122 DEBUGS(" elf_doRelocate: R_386_RELATIVE *0x%x = 0x%x + 0x%x", ptr, iBaseDiff, addend);
123 *ptr = iBaseDiff + addend;
128 void *src = GetSymbol(Sym, &size);
129 DEBUGS(" elf_doRelocate_386: R_386_COPY (%p, %p, %i)", ptr, src, size);
130 memcpy(ptr, src, size);
134 SysDebug("elf_doRelocate_386: Unknown relocation %i", type);
139 void elf_doRelocate_arm(uint32_t r_info, uint32_t *ptr, Elf32_Addr addend, int type, int bRela, const char *Sym, intptr_t iBaseDiff)
146 DEBUGS(" elf_doRelocate_arm: R_ARM_ABS32 %p (%s + %x)", ptr, Sym, addend);
147 val = (intptr_t)GetSymbol(Sym, NULL);
151 DEBUGS(" elf_doRelocate_arm: R_ARM_GLOB_DAT %p (%s + %x)", ptr, Sym, addend);
152 val = (intptr_t)GetSymbol(Sym, NULL);
155 case R_ARM_JUMP_SLOT:
156 if(!bRela) addend = 0;
157 DEBUGS(" elf_doRelocate_arm: R_ARM_JUMP_SLOT %p (%s + %x)", ptr, Sym, addend);
158 val = (intptr_t)GetSymbol(Sym, NULL);
164 void *src = GetSymbol(Sym, &size);
165 DEBUGS(" elf_doRelocate_arm: R_ARM_COPY (%p, %p, %i)", ptr, src, size);
166 memcpy(ptr, src, size);
168 // Delta between link and runtime locations + A
171 // TODO: Get delta for a symbol
172 SysDebug("elf_doRelocate_arm: TODO - Implment R_ARM_RELATIVE for symbols");
175 *ptr = iBaseDiff + addend;
179 SysDebug("elf_doRelocate_arm: Unknown Relocation, %i", type);
184 void *Elf32Relocate(void *Base, char **envp, const char *Filename)
186 Elf32_Ehdr *hdr = Base;
188 int i, j; // Counters
190 intptr_t iRealBase = -1;
194 Elf32_Rel *rel = NULL;
195 Elf32_Rela *rela = NULL;
197 int relSz=0, relEntSz=8;
198 int relaSz=0, relaEntSz=8;
199 int pltSz=0, pltType=0;
200 Elf32_Dyn *dynamicTab = NULL; // Dynamic Table Pointer
201 char *dynstrtab = NULL; // .dynamic String Table
202 Elf32_Sym *dynsymtab;
203 void (*do_relocate)(uint32_t t_info, uint32_t *ptr, Elf32_Addr addend, int Type, int bRela, const char *Sym, intptr_t iBaseDiff);
204 auto void _doRelocate(uint32_t r_info, uint32_t *ptr, int bRela, Elf32_Addr addend);
206 DEBUGS("ElfRelocate: (Base=0x%x)", Base);
208 // Check magic header
211 // Parse Program Header to get Dynamic Table
212 phtab = (void*)( (uintptr_t)Base + hdr->phoff );
213 iSegmentCount = hdr->phentcount;
214 for(i=0;i<iSegmentCount;i++)
216 // Determine linked base address
217 if(phtab[i].Type == PT_LOAD && iRealBase > phtab[i].VAddr)
218 iRealBase = phtab[i].VAddr;
220 // Find Dynamic Section
221 if(phtab[i].Type == PT_DYNAMIC) {
223 DEBUGS(" WARNING - elf_relocate: Multiple PT_DYNAMIC segments");
226 dynamicTab = (void *) (intptr_t) phtab[i].VAddr;
227 j = i; // Save Dynamic Table ID
231 // Page Align real base
233 DEBUGS(" elf_relocate: True Base = 0x%x, Compiled Base = 0x%x", Base, iRealBase);
235 // Adjust "Real" Base
236 iBaseDiff = (intptr_t)Base - iRealBase;
238 // hdr->entrypoint += iBaseDiff; // Adjust Entrypoint
240 // Check if a PT_DYNAMIC segement was found
242 SysDebug(" elf_relocate: No PT_DYNAMIC segment in image %p, returning", Base);
243 return (void *)(intptr_t)(hdr->entrypoint + iBaseDiff);
246 // Adjust Dynamic Table
247 dynamicTab = (void *)( (intptr_t)dynamicTab + iBaseDiff );
249 // === Get Symbol table and String Table ===
250 for( j = 0; dynamicTab[j].d_tag != DT_NULL; j++)
252 switch(dynamicTab[j].d_tag)
254 // --- Symbol Table ---
256 DEBUGS(" elf_relocate: DYNAMIC Symbol Table 0x%x (0x%x)",
257 dynamicTab[j].d_val, dynamicTab[j].d_val + iBaseDiff);
258 if(iBaseDiff != 0) dynamicTab[j].d_val += iBaseDiff;
259 dynsymtab = (void*)(intptr_t)dynamicTab[j].d_val;
261 // --- String Table ---
263 DEBUGS(" elf_relocate: DYNAMIC String Table 0x%x (0x%x)",
264 dynamicTab[j].d_val, dynamicTab[j].d_val + iBaseDiff);
265 if(iBaseDiff != 0) dynamicTab[j].d_val += iBaseDiff;
266 dynstrtab = (void*)(intptr_t)dynamicTab[j].d_val;
270 if(iBaseDiff != 0) dynamicTab[j].d_val += iBaseDiff;
271 // iSymCount = ((Elf32_Word*)(intptr_t)dynamicTab[j].d_val)[1];
276 if(dynsymtab == NULL) {
277 SysDebug("ld-acess.so - WARNING: No Dynamic Symbol table in %p, returning", hdr);
278 return (void *)(intptr_t) (hdr->entrypoint + iBaseDiff);
281 // === Add to loaded list (can be imported now) ===
282 AddLoaded( Filename, Base );
284 // === Parse Relocation Data ===
285 DEBUGS(" elf_relocate: dynamicTab = 0x%x", dynamicTab);
286 for( j = 0; dynamicTab[j].d_tag != DT_NULL; j++)
288 switch(dynamicTab[j].d_tag)
290 // --- Shared Library Name ---
292 DEBUGS(" elf_relocate: .so Name '%s'", dynstrtab+dynamicTab[j].d_val);
294 // --- Needed Library ---
296 libPath = dynstrtab + dynamicTab[j].d_val;
297 DEBUGS(" Required Library '%s'", libPath);
298 if(LoadLibrary(libPath, NULL, envp) == 0) {
300 DEBUGS(" elf_relocate: Unable to load '%s'", libPath);
302 SysDebug("Unable to load required library '%s'", libPath);
306 DEBUGS(" Lib loaded");
309 // case DT_PLTGOT: pltgot = (void*)(iBaseDiff + dynamicTab[j].d_val); break;
310 case DT_JMPREL: plt = (void*)(iBaseDiff + dynamicTab[j].d_val); break;
311 case DT_PLTREL: pltType = dynamicTab[j].d_val; break;
312 case DT_PLTRELSZ: pltSz = dynamicTab[j].d_val; break;
314 // --- Relocation ---
315 case DT_REL: rel = (void*)(iBaseDiff + dynamicTab[j].d_val); break;
316 case DT_RELSZ: relSz = dynamicTab[j].d_val; break;
317 case DT_RELENT: relEntSz = dynamicTab[j].d_val; break;
318 case DT_RELA: rela = (void*)(iBaseDiff + dynamicTab[j].d_val); break;
319 case DT_RELASZ: relaSz = dynamicTab[j].d_val; break;
320 case DT_RELAENT: relaEntSz = dynamicTab[j].d_val; break;
322 // --- Symbol Table ---
324 // --- Hash Table ---
326 // --- String Table ---
332 if(dynamicTab[j].d_tag > DT_JMPREL) continue;
333 //DEBUGS(" elf_relocate: %i-%i = %s,0x%x",
334 // i,j, csaDT_NAMES[dynamicTab[j].d_tag],dynamicTab[j].d_val);
339 DEBUGS(" elf_relocate: Beginning Relocation");
341 void _doRelocate(uint32_t r_info, uint32_t *ptr, int bRela, Elf32_Addr addend)
343 int type = ELF32_R_TYPE(r_info);
344 int sym = ELF32_R_SYM(r_info);
345 const char *symname = dynstrtab + dynsymtab[sym].nameOfs;
346 do_relocate(r_info, ptr, addend, type, bRela, symname, iBaseDiff);
352 do_relocate = elf_doRelocate_386;
355 do_relocate = elf_doRelocate_arm;
358 SysDebug("Elf32Relocate: Unknown machine type %i", hdr->machine);
362 DEBUGS("do_relocate = %p (%p or %p)", do_relocate, &elf_doRelocate_386, &elf_doRelocate_arm);
364 // Parse Relocation Entries
368 DEBUGS(" elf_relocate: rel=0x%x, relSz=0x%x, relEntSz=0x%x", rel, relSz, relEntSz);
369 j = relSz / relEntSz;
370 for( i = 0; i < j; i++ )
372 //DEBUGS(" Rel %i: 0x%x+0x%x", i, iBaseDiff, rel[i].r_offset);
373 ptr = (void*)(iBaseDiff + rel[i].r_offset);
374 _doRelocate(rel[i].r_info, ptr, 0, *ptr);
377 // Parse Relocation Entries
381 DEBUGS(" elf_relocate: rela=0x%x, relaSz=0x%x, relaEntSz=0x%x", rela, relaSz, relaEntSz);
382 j = relaSz / relaEntSz;
383 for( i = 0; i < j; i++ )
385 ptr = (void*)(iBaseDiff + rela[i].r_offset);
386 _doRelocate(rel[i].r_info, ptr, 1, rela[i].r_addend);
390 // === Process PLT (Procedure Linkage Table) ===
394 DEBUGS(" elf_relocate: Relocate PLT, plt=0x%x", plt);
395 if(pltType == DT_REL)
397 Elf32_Rel *pltRel = plt;
398 j = pltSz / sizeof(Elf32_Rel);
399 DEBUGS(" elf_relocate: PLT Reloc Type = Rel, %i entries", j);
402 ptr = (void*)(iBaseDiff + pltRel[i].r_offset);
403 _doRelocate(pltRel[i].r_info, ptr, 0, *ptr);
408 Elf32_Rela *pltRela = plt;
409 j = pltSz / sizeof(Elf32_Rela);
410 DEBUGS(" elf_relocate: PLT Reloc Type = Rela, %i entries", j);
413 ptr = (void*)(iRealBase + pltRela[i].r_offset);
414 _doRelocate(pltRela[i].r_info, ptr, 1, pltRela[i].r_addend);
419 DEBUGS("ElfRelocate: RETURN 0x%x to %p", hdr->entrypoint + iBaseDiff, __builtin_return_address(0));
420 return (void*)(intptr_t)( hdr->entrypoint + iBaseDiff );
423 int Elf32GetSymbol(void *Base, const char *Name, void **ret, size_t *Size)
425 Elf32_Ehdr *hdr = Base;
426 Elf32_Sym *symtab = NULL;
428 Elf32_Word *pBuckets = NULL;
431 const char *dynstrtab = NULL;
432 uintptr_t iBaseDiff = -1;
434 Elf32_Dyn *dynTab = NULL;
438 phtab = (void*)( (uintptr_t)Base + hdr->phoff );
439 for( i = 0; i < hdr->phentcount; i ++ )
441 if(phtab[i].Type == PT_LOAD && iBaseDiff > phtab[i].VAddr)
442 iBaseDiff = phtab[i].VAddr;
443 if( phtab[i].Type == PT_DYNAMIC ) {
444 dynTab = (void*)(intptr_t)phtab[i].VAddr;
448 SysDebug("ERROR - Unable to find DYNAMIC segment in %p", Base);
451 iBaseDiff = (intptr_t)Base - iBaseDiff; // Make iBaseDiff actually the diff
452 dynTab = (void*)( (intptr_t)dynTab + iBaseDiff );
453 for( i = 0; dynTab[i].d_tag != DT_NULL; i++)
455 switch(dynTab[i].d_tag)
457 // --- Symbol Table ---
459 symtab = (void*)(intptr_t) dynTab[i].d_val; // Rebased in Relocate
462 dynstrtab = (void*)(intptr_t) dynTab[i].d_val;
466 pBuckets = (void*)(intptr_t) dynTab[i].d_val;
472 SysDebug("ERRO - No DT_SYMTAB in %p", Base);
476 SysDebug("ERRO - No DT_HASH in %p", Base);
480 SysDebug("ERRO - No DT_STRTAB in %p", Base);
484 nbuckets = pBuckets[0];
485 // iSymCount = pBuckets[1];
486 pBuckets = &pBuckets[2];
487 pChains = &pBuckets[ nbuckets ];
490 iNameHash = ElfHashString(Name);
491 iNameHash %= nbuckets;
494 i = pBuckets[ iNameHash ];
495 if(symtab[i].shndx != SHN_UNDEF && strcmp(dynstrtab + symtab[i].nameOfs, Name) == 0) {
496 *ret = (void*)( (uintptr_t) symtab[ i ].value + iBaseDiff );
497 if(Size) *Size = symtab[i].size;
501 while(pChains[i] != STN_UNDEF)
504 if(symtab[i].shndx != SHN_UNDEF && strcmp(dynstrtab + symtab[ i ].nameOfs, Name) == 0) {
505 *ret = (void*)( (uintptr_t)symtab[ i ].value + iBaseDiff );
506 if(Size) *Size = symtab[i].size;
515 void *Elf64Relocate(void *Base, char **envp, const char *Filename)
518 Elf64_Ehdr *hdr = Base;
521 Elf64_Addr compiledBase = -1, baseDiff;
522 Elf64_Sym *symtab = NULL;
524 Elf64_Word *hashtab = NULL;
525 Elf64_Rel *rel = NULL;
527 Elf64_Rela *rela = NULL;
530 int plt_size = 0, plt_type = 0;
532 DEBUGS("Elf64Relocate: hdr = {");
533 DEBUGS("Elf64Relocate: e_ident = '%.16s'", hdr->e_ident);
534 DEBUGS("Elf64Relocate: e_type = 0x%x", hdr->e_type);
535 DEBUGS("Elf64Relocate: e_machine = 0x%x", hdr->e_machine);
536 DEBUGS("Elf64Relocate: e_version = 0x%x", hdr->e_version);
537 DEBUGS("Elf64Relocate: e_entry = %p", hdr->e_entry);
538 DEBUGS("Elf64Relocate: e_phoff = 0x%llx", hdr->e_phoff);
539 DEBUGS("Elf64Relocate: e_shoff = 0x%llx", hdr->e_shoff);
540 DEBUGS("Elf64Relocate: e_flags = 0x%x", hdr->e_flags);
541 DEBUGS("Elf64Relocate: e_ehsize = 0x%x", hdr->e_ehsize);
542 DEBUGS("Elf64Relocate: e_phentsize = 0x%x", hdr->e_phentsize);
543 DEBUGS("Elf64Relocate: e_phnum = %i", hdr->e_phnum);
545 // Scan for the dynamic table (and find the compiled base)
546 phtab = Base + hdr->e_phoff;
547 for( i = 0; i < hdr->e_phnum; i ++ )
549 if(phtab[i].p_type == PT_DYNAMIC)
550 dyntab = (void *)(intptr_t)phtab[i].p_vaddr;
551 if(phtab[i].p_type == PT_LOAD && compiledBase > phtab[i].p_vaddr)
552 compiledBase = phtab[i].p_vaddr;
555 baseDiff = (uintptr_t)Base - compiledBase;
557 DEBUGS("baseDiff = %p", baseDiff);
560 SysDebug(" Elf64Relocate: No PT_DYNAMIC segment in image %p, returning", Base);
561 return (void *)(uintptr_t)(hdr->e_entry + baseDiff);
564 dyntab = (void *)(uintptr_t)((uintptr_t)dyntab + baseDiff);
566 // Parse the dynamic table (first pass)
567 // - Search for String, Symbol and Hash tables
568 for(i = 0; dyntab[i].d_tag != DT_NULL; i ++)
570 switch(dyntab[i].d_tag)
573 dyntab[i].d_un.d_ptr += baseDiff;
574 symtab = (void *)(uintptr_t)dyntab[i].d_un.d_ptr;
577 dyntab[i].d_un.d_ptr += baseDiff;
578 strtab = (void *)(uintptr_t)dyntab[i].d_un.d_ptr;
581 dyntab[i].d_un.d_ptr += baseDiff;
582 hashtab = (void *)(uintptr_t)dyntab[i].d_un.d_ptr;
587 if( !symtab || !strtab || !hashtab ) {
588 SysDebug("ld-acess - Elf64Relocate: Missing Symbol, string or hash table");
592 // Ready for symbol use
593 AddLoaded( Filename, Base );
595 // Second pass on dynamic table
596 for(i = 0; dyntab[i].d_tag != DT_NULL; i ++)
598 DEBUGS("dyntab[%i].d_tag = %i", i, dyntab[i].d_tag);
599 switch(dyntab[i].d_tag)
601 case DT_SONAME: break;
604 char *libPath = strtab + dyntab[i].d_un.d_val;
605 DEBUGS("Elf64Relocate: libPath = '%s'", libPath);
606 if(LoadLibrary(libPath, NULL, envp) == 0) {
607 SysDebug("ld-acess - Elf64Relocate: Unable to load '%s'", libPath);
612 // Relocation entries
614 dyntab[i].d_un.d_ptr += baseDiff;
615 rel = (void *)(uintptr_t)dyntab[i].d_un.d_ptr;
618 rel_count = dyntab[i].d_un.d_val / sizeof(Elf64_Rel);
621 if( dyntab[i].d_un.d_val != sizeof(Elf64_Rel) ) {
622 SysDebug("ld-acess - Elf64Relocate: DT_RELENT(%i) != sizeof(Elf64_Rel)(%i)",
623 dyntab[i].d_un.d_val, sizeof(Elf64_Rel));
628 dyntab[i].d_un.d_ptr += baseDiff;
629 rela = (void *)(uintptr_t)dyntab[i].d_un.d_ptr;
632 rela_count = dyntab[i].d_un.d_val / sizeof(Elf64_Rela);
635 if( dyntab[i].d_un.d_val != sizeof(Elf64_Rela) ) {
636 SysDebug("ld-acess - Elf64Relocate: DT_RELAENT(%i) != sizeof(Elf64_Rela)(%i)",
637 dyntab[i].d_un.d_val, sizeof(Elf64_Rela));
642 dyntab[i].d_un.d_ptr += baseDiff;
643 pltrel = (void *)(uintptr_t)dyntab[i].d_un.d_ptr;
646 plt_type = dyntab[i].d_un.d_val;
649 plt_size = dyntab[i].d_un.d_val;
654 // Relocation function
655 void _Elf64DoReloc(Elf64_Xword r_info, void *ptr, Elf64_Sxword addend)
657 int sym = ELF64_R_SYM(r_info);
658 int type = ELF64_R_TYPE(r_info);
659 const char *symname = strtab + symtab[sym].st_name;
665 *(uint64_t*)ptr = (uintptr_t)GetSymbol(symname, NULL) + addend;
667 case R_X86_64_COPY: {
669 void *sym = GetSymbol(symname, &size);
670 memcpy(ptr, sym, size);
672 case R_X86_64_GLOB_DAT:
673 *(uint64_t*)ptr = (uintptr_t)GetSymbol(symname, NULL);
675 case R_X86_64_JUMP_SLOT:
676 *(uint64_t*)ptr = (uintptr_t)GetSymbol(symname, NULL);
678 case R_X86_64_RELATIVE:
679 *(uint64_t*)ptr = (uintptr_t)Base + addend;
682 SysDebug("ld-acess - _Elf64DoReloc: Unknown relocation type %i", type);
689 DEBUGS("rel_count = %i", rel_count);
690 for( i = 0; i < rel_count; i ++ )
692 uint64_t *ptr = (void *)(uintptr_t)( rel[i].r_offset + baseDiff );
693 _Elf64DoReloc( rel[i].r_info, ptr, *ptr);
699 DEBUGS("rela_count = %i", rela_count);
700 for( i = 0; i < rela_count; i ++ )
702 uint64_t *ptr = (void *)(uintptr_t)( rela[i].r_offset + baseDiff );
703 _Elf64DoReloc( rela[i].r_info, ptr, rela[i].r_addend );
707 if( pltrel && plt_type )
709 if( plt_type == DT_REL ) {
710 Elf64_Rel *plt = pltrel;
711 int count = plt_size / sizeof(Elf64_Rel);
712 DEBUGS("plt rel count = %i", count);
713 for( i = 0; i < count; i ++ )
715 uint64_t *ptr = (void *)(uintptr_t)( plt[i].r_offset + baseDiff );
716 _Elf64DoReloc( plt[i].r_info, ptr, *ptr);
720 Elf64_Rela *plt = pltrel;
721 int count = plt_size / sizeof(Elf64_Rela);
722 DEBUGS("plt rela count = %i", count);
723 for( i = 0; i < count; i ++ )
725 uint64_t *ptr = (void *)(uintptr_t)( plt[i].r_offset + baseDiff );
726 _Elf64DoReloc( plt[i].r_info, ptr, plt[i].r_addend);
732 void *ret = (void *)(uintptr_t)(hdr->e_entry + baseDiff);
733 DEBUGS("Elf64Relocate: Relocations done, return %p", ret);
738 int Elf64GetSymbol(void *Base, const char *Name, void **Ret, size_t *Size)
740 Elf64_Ehdr *hdr = Base;
743 // int iSymCount = 0;
745 Elf64_Word *pBuckets;
748 const char *dynstrtab;
749 uintptr_t iBaseDiff = -1;
755 // Catch the current executable
759 Elf64_Dyn *dynTab = NULL;
763 phtab = (void*)( (intptr_t)Base + hdr->e_phoff );
764 for( i = 0; i < hdr->e_phnum; i ++ )
766 if(phtab[i].p_type == PT_LOAD && iBaseDiff > phtab[i].p_vaddr)
767 iBaseDiff = phtab[i].p_vaddr;
768 if( phtab[i].p_type == PT_DYNAMIC ) {
769 dynTab = (void*)(intptr_t)phtab[i].p_vaddr;
773 SysDebug("ERROR - Unable to find DYNAMIC segment in %p", Base);
776 iBaseDiff = (intptr_t)Base - iBaseDiff; // Make iBaseDiff actually the diff
777 dynTab = (void*)( (intptr_t)dynTab + iBaseDiff );
779 for( j = 0; dynTab[j].d_tag != DT_NULL; j++)
781 switch(dynTab[j].d_tag)
783 // --- Symbol Table ---
785 symtab = (void*)(intptr_t) dynTab[j].d_un.d_val; // Rebased in Relocate
788 dynstrtab = (void*)(intptr_t) dynTab[j].d_un.d_val;
792 pBuckets = (void*)(intptr_t) dynTab[j].d_un.d_val;
798 nbuckets = pBuckets[0];
799 // iSymCount = pBuckets[1];
800 pBuckets = &pBuckets[2];
801 pChains = &pBuckets[ nbuckets ];
804 iNameHash = ElfHashString(Name);
805 iNameHash %= nbuckets;
808 i = pBuckets[ iNameHash ];
809 if(symtab[i].st_shndx != SHN_UNDEF && strcmp(dynstrtab + symtab[i].st_name, Name) == 0) {
810 *Ret = (void*)( (intptr_t)symtab[i].st_value + iBaseDiff );
811 if(Size) *Size = symtab[i].st_size;
812 DEBUGS("%s = %p", Name, *Ret);
816 while(pChains[i] != STN_UNDEF)
819 if(symtab[i].st_shndx != SHN_UNDEF && strcmp(dynstrtab + symtab[i].st_name, Name) == 0) {
820 *Ret = (void*)((intptr_t)symtab[i].st_value + iBaseDiff);
821 if(Size) *Size = symtab[i].st_size;
822 DEBUGS("%s = %p", Name, *Ret);
832 uint32_t ElfHashString(const char *name)
837 h = (h << 4) + *(uint8_t*)name++;
838 if( (g = h & 0xf0000000) )