#include "common.h"
#include <stdint.h>
+#include <stdbool.h>
#ifndef assert
# include <assert.h>
#endif
# define SUPPORT_ELF64
#endif
-typedef struct
-{
- void *Base;
- intptr_t iBaseDiff;
- const char *strtab;
- Elf32_Sym *symtab;
-} tElfRelocInfo;
-
-typedef int tElf32RelocFcn(tElfRelocInfo *Info, uint32_t t_info, uint32_t *ptr, Elf32_Addr addend, int bRela);
-
// === CONSTANTS ===
#if DEBUG
//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"};
//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"};
#endif
+#ifdef SUPPORT_ELF64
+#endif
+
// === PROTOTYPES ===
void *ElfRelocate(void *Base, char **envp, const char *Filename);
int ElfGetSymbol(void *Base, const char *Name, void **Ret, size_t *Size);
-void *Elf32Relocate(void *Base, char **envp, const char *Filename);
- int Elf32GetSymbolVars(void *Base, Elf32_Sym** symtab, Elf32_Word** pBuckets, const char **dynstrtab, uintptr_t* piBaseDiff);
- int Elf32GetSymbolInfo(void *Base, const char *Name, void **Addr, size_t *Size, int* Section, int *Binding, int *Type);
- int Elf32GetSymbol(void *Base, const char *Name, void **Ret, size_t *Size);
-tElf32RelocFcn elf_doRelocate_386;
-tElf32RelocFcn elf_doRelocate_arm;
-tElf32RelocFcn elf_doRelocate_unk;
+void *Elf32_Relocate(void *Base, char **envp, const char *Filename);
+ int Elf32_GetSymbol(void *Base, const char *Name, void **Ret, size_t *Size);
#ifdef SUPPORT_ELF64
-int _Elf64DoReloc_X86_64(void *Base, const char *strtab, Elf64_Sym *symtab, Elf64_Xword r_info, void *ptr, Elf64_Sxword addend);
-void *Elf64Relocate(void *Base, char **envp, const char *Filename);
- int Elf64GetSymbol(void *Base, const char *Name, void **Ret, size_t *Size);
+void *Elf64_Relocate(void *Base, char **envp, const char *Filename);
+ int Elf64_GetSymbol(void *Base, const char *Name, void **Ret, size_t *Size);
#endif
- int Elf32GetSymbolReloc(tElfRelocInfo *Info, const Elf32_Sym *Symbol, void **Ret, size_t *Size);
uint32_t ElfHashString(const char *name);
// === CODE ===
switch(hdr->e_ident[4])
{
case ELFCLASS32:
- return Elf32Relocate(Base, envp, Filename);
+ return Elf32_Relocate(Base, envp, Filename);
#ifdef SUPPORT_ELF64
case ELFCLASS64:
- return Elf64Relocate(Base, envp, Filename);
+ return Elf64_Relocate(Base, envp, Filename);
#endif
default:
SysDebug("ld-acess - ElfRelocate: Unknown file class %i", hdr->e_ident[4]);
switch(hdr->e_ident[4])
{
case ELFCLASS32:
- return Elf32GetSymbol(Base, Name, ret, Size);
+ return Elf32_GetSymbol(Base, Name, ret, Size);
#ifdef SUPPORT_ELF64
case ELFCLASS64:
- return Elf64GetSymbol(Base, Name, ret, Size);
+ return Elf64_GetSymbol(Base, Name, ret, Size);
#endif
default:
SysDebug("ld-acess - ElfRelocate: Unknown file class %i", hdr->e_ident[4]);
}
}
-int elf_doRelocate_386(tElfRelocInfo *Info, uint32_t r_info, uint32_t *ptr, Elf32_Addr addend, int bRela)
+// --------------------------------------------------------------------
+// Elf32 support
+// --------------------------------------------------------------------
+#define ELFTYPE Elf32
+#include "elf_impl.c"
+#undef ELFTYPE
+
+Elf32_RelocFcn elf_doRelocate_386;
+Elf32_RelocFcn elf_doRelocate_arm;
+
+int elf_doRelocate_386(const Elf32_RelocInfo *Info, Elf32_Word r_info, Elf32_Word* ptr, Elf32_Addr addend, bool bRela)
{
const Elf32_Sym *sym = &Info->symtab[ ELF32_R_SYM(r_info) ];
void *symval = (void*)(intptr_t)sym->st_value;
return 0;
}
-int elf_doRelocate_arm(tElfRelocInfo *Info, uint32_t r_info, uint32_t *ptr, Elf32_Addr addend, int bRela)
+int elf_doRelocate_arm(const Elf32_RelocInfo *Info, Elf32_Word r_info, Elf32_Word* ptr, Elf32_Addr addend, bool bRela)
{
const Elf32_Sym *sym = &Info->symtab[ ELF32_R_SYM(r_info) ];
void *symval = (void*)(intptr_t)sym->st_value;
return 0;
}
-int elf_doRelocate_unk(tElfRelocInfo *Info, uint32_t r_info, uint32_t *ptr, Elf32_Addr addend, int bRela)
-{
- return 1;
-}
-
-void *Elf32Relocate(void *Base, char **envp, const char *Filename)
+Elf32_RelocFcn* Elf32_GetRelocFcn(unsigned Machine)
{
- const Elf32_Ehdr *hdr = Base;
- char *libPath;
- intptr_t iRealBase = -1;
- Elf32_Rel *rel = NULL;
- Elf32_Rela *rela = NULL;
- void *plt = NULL;
- int relSz=0, relEntSz=8;
- int relaSz=0, relaEntSz=8;
- int pltSz=0, pltType=0;
- Elf32_Dyn *dynamicTab = NULL; // Dynamic Table Pointer
-
- TRACE("(Base=0x%x)", Base);
-
- // Check magic header
-
-
- // Parse Program Header to get Dynamic Table
- // - Determine the linked base of the executable
- const Elf32_Phdr *phtab = (void*)( (uintptr_t)Base + hdr->phoff );
- const int iSegmentCount = hdr->phentcount;
- for(int i = 0; i < iSegmentCount; i ++)
+ switch(Machine)
{
- switch(phtab[i].Type)
- {
- case PT_LOAD:
- // Determine linked base address
- if( iRealBase > phtab[i].VAddr)
- iRealBase = phtab[i].VAddr;
- break;
- case PT_DYNAMIC:
- // Find Dynamic Section
- if(!dynamicTab) {
- dynamicTab = (void *) (intptr_t) phtab[i].VAddr;
- }
- else {
- WARNING("elf_relocate: Multiple PT_DYNAMIC segments");
- }
- break;
- }
- }
-
- // Page Align real base
- iRealBase &= ~0xFFF;
-
- // Adjust "Real" Base
- const intptr_t iBaseDiff = (intptr_t)Base - iRealBase;
-
- TRACE("True Base = 0x%x, Compiled Base = 0x%x, Difference = 0x%x", Base, iRealBase, iBaseDiff);
-
- // Check if a PT_DYNAMIC segement was found
- if(!dynamicTab) {
- SysDebug(" elf_relocate: No PT_DYNAMIC segment in image %p, returning", Base);
- return (void *)(intptr_t)(hdr->entrypoint + iBaseDiff);
- }
-
- // Allow writing to read-only segments, just in case they need to be relocated
- // - Will be reversed at the end of the function
- for( int i = 0; i < iSegmentCount; i ++ )
- {
- if(phtab[i].Type == PT_LOAD && !(phtab[i].Flags & PF_W) ) {
- uintptr_t addr = phtab[i].VAddr + iBaseDiff;
- uintptr_t end = addr + phtab[i].MemSize;
- for( ; addr < end; addr += PAGE_SIZE )
- _SysSetMemFlags(addr, 0, 1); // Unset RO
- }
- }
-
- // Adjust Dynamic Table
- dynamicTab = (void *)( (intptr_t)dynamicTab + iBaseDiff );
-
- // === Get Symbol table and String Table ===
- char *dynstrtab = NULL; // .dynamic String Table
- Elf32_Sym *dynsymtab = NULL;
- Elf32_Word *hashtable = NULL;
- int iSymCount = 0;
- for( int j = 0; dynamicTab[j].d_tag != DT_NULL; j++)
- {
- const Elf32_Dyn *dt = &dynamicTab[j];
- switch(dt->d_tag)
- {
- // --- Symbol Table ---
- case DT_SYMTAB:
- TRACE("DYNAMIC Symbol Table 0x%x (0x%x)", dt->d_val, dt->d_val + iBaseDiff);
- dynsymtab = (void*)((intptr_t)dt->d_val + iBaseDiff);
- break;
- // --- String Table ---
- case DT_STRTAB:
- TRACE("DYNAMIC String Table 0x%x (0x%x)", dt->d_val, dt->d_val + iBaseDiff);
- dynstrtab = (void*)((intptr_t)dt->d_val + iBaseDiff);
- break;
- // --- Hash Table --
- case DT_HASH:
- TRACE("DYNAMIC Hash table %p (%p)", dt->d_val, dt->d_val + iBaseDiff);
- hashtable = (void*)((intptr_t)dt->d_val + iBaseDiff);
- iSymCount = hashtable[1];
- break;
- }
+ case EM_386: return elf_doRelocate_386;
+ case EM_ARM: return elf_doRelocate_arm;
+ default: return NULL;
}
+}
- if(dynsymtab == NULL) {
- SysDebug("ld-acess.so - WARNING: No Dynamic Symbol table in %p, returning", hdr);
- return (void *)(intptr_t) (hdr->entrypoint + iBaseDiff);
- }
-
- // Apply base offset to locally defined symbols
- // - #0 is defined as ("" SHN_UNDEF), so skip it
- for( int i = 1; i < iSymCount; i ++ )
- {
- Elf32_Sym *sym = &dynsymtab[i];
- const char *name = dynstrtab + sym->st_name;
- (void)name;
- if( sym->st_shndx == SHN_UNDEF )
- {
- TRACE("Sym %i'%s' deferred (SHN_UNDEF)", i, name);
- }
- else if( sym->st_shndx == SHN_ABS )
- {
- // Leave as is
- SysDebug("Sym %i'%s' untouched", i, name);
- }
- else
- {
- void *newval;
- size_t newsize;
- if( ELF32_ST_BIND(sym->st_info) != STB_WEAK )
- {
- TRACE("Sym %i'%s' = %p (local)", i, name, sym->st_value + iBaseDiff);
- sym->st_value += iBaseDiff;
- }
- // If GetSymbol doesn't return a strong/global symbol value
- else if( GetSymbol(name, &newval, &newsize, Base) != 1 )
- {
- TRACE("Sym %i'%s' = %p (Local weak)", i, name, sym->st_value + iBaseDiff);
- sym->st_value += iBaseDiff;
- }
- else
- {
- TRACE("Sym %i'%s' = %p+0x%x (Extern weak)", i, name, newval, newsize);
- sym->st_value = (uintptr_t)newval;
- sym->st_size = newsize;
- }
- }
- }
- // === Add to loaded list (can be imported now) ===
- AddLoaded( Filename, Base );
+// --------------------------------------------------------------------
+// Elf64 support
+// --------------------------------------------------------------------
+#ifdef SUPPORT_ELF64
- // === Parse Relocation Data ===
- TRACE("dynamicTab = 0x%x", dynamicTab);
- for( int j = 0; dynamicTab[j].d_tag != DT_NULL; j++)
- {
- const Elf32_Dyn *dt = &dynamicTab[j];
- switch(dt->d_tag)
- {
- // --- Shared Library Name ---
- case DT_SONAME:
- TRACE(".so Name '%s'", dynstrtab + dt->d_val);
- break;
- // --- Needed Library ---
- case DT_NEEDED:
- //assert(dt->d_val <= sizeof_dynstrtab);
- libPath = dynstrtab + dt->d_val;
- TRACE(" Required Library '%s'", libPath);
- if(LoadLibrary(libPath, NULL, envp) == 0) {
- SysDebug("Unable to load required library '%s'", libPath);
- return 0;
- }
- TRACE(" Lib loaded");
- break;
- // --- PLT/GOT ---
-// case DT_PLTGOT: pltgot = (void*)(iBaseDiff + dt->d_val); break;
- case DT_JMPREL: plt = (void*)(iBaseDiff + dt->d_val); break;
- case DT_PLTREL: pltType = dt->d_val; break;
- case DT_PLTRELSZ: pltSz = dt->d_val; break;
-
- // --- Relocation ---
- case DT_REL: rel = (void*)(iBaseDiff + dt->d_val); break;
- case DT_RELSZ: relSz = dt->d_val; break;
- case DT_RELENT: relEntSz = dt->d_val; break;
- case DT_RELA: rela = (void*)(iBaseDiff + dt->d_val); break;
- case DT_RELASZ: relaSz = dt->d_val; break;
- case DT_RELAENT: relaEntSz = dt->d_val; break;
-
- // --- Symbol Table ---
- case DT_SYMTAB:
- // --- Hash Table ---
- case DT_HASH:
- // --- String Table ---
- case DT_STRTAB:
- break;
-
- // --- Unknown ---
- default:
- if(dt->d_tag > DT_JMPREL) continue;
- //DEBUGS(" elf_relocate: %i-%i = %s,0x%x",
- // i,j, csaDT_NAMES[dynamicTab[j].d_tag],dynamicTab[j].d_val);
- break;
- }
- }
-
- // Resolve symbols (second pass)
- // - #0 is defined as ("" SHN_UNDEF), so skip it
- int fail = 0;
- for( int i = 1; i < iSymCount; i ++ )
- {
- Elf32_Sym *sym = &dynsymtab[i];
- const char *name = dynstrtab + sym->st_name;
- if( sym->st_shndx == SHN_UNDEF )
- {
- void *newval;
- size_t newsize;
- if( !GetSymbol(name, &newval, &newsize, Base) ) {
- if( ELF32_ST_BIND(sym->st_info) != STB_WEAK ) {
- // Not a weak binding, set fail and move on
- WARNING("Elf32Relocate: Can't find required symbol '%s' for '%s'",
- name, Filename);
- fail = 1;
- continue ;
- }
- // Leave the symbol value as-is
- }
- else {
- TRACE("Sym %i'%s' bound to %p+0x%x", i, name, newval, newsize);
- sym->st_value = (intptr_t)newval;
- sym->st_size = newsize;
- }
- }
- else if( sym->st_shndx == SHN_ABS )
- {
- // Leave as is
- }
- else
- {
- // Handled previously
- // TODO: What about weak locally-defined symbols?
- //assert( ELF32_ST_BIND(sym->st_info) != STB_WEAK );
- }
- }
- if( fail ) {
- WARNING("Relocation of '%s' failed", Filename);
- return NULL;
- }
-
- TRACE("Beginning Relocation on '%s'", Filename);
+#define ELFTYPE Elf64
+#include "elf_impl.c"
+#undef ELFTYPE
+Elf64_RelocFcn elf_doRelocate_x86_64;
- tElf32RelocFcn *do_relocate;
- switch(hdr->machine)
+int elf_doRelocate_x86_64(const Elf64_RelocInfo *Info, Elf64_Xword r_info, Elf64_Xword* ptr, Elf64_Addr addend, bool bRela)
+{
+ const Elf64_Sym *sym = &Info->symtab[ ELF64_R_SYM(r_info) ];
+ void *symval = (void*)(intptr_t)sym->st_value;
+ size_t size = sym->st_size;
+ TRACE("%i '%s'", ELF64_R_TYPE(r_info), Info->strtab + sym->st_name);
+ switch( ELF64_R_TYPE(r_info) )
{
- case EM_386:
- do_relocate = elf_doRelocate_386;
+ case R_X86_64_NONE:
break;
- case EM_ARM:
- do_relocate = elf_doRelocate_arm;
+ case R_X86_64_64:
+ TRACE("R_X86_64_64 *0x%x = %p + 0x%x", ptr, symval, addend);
+ *ptr = (intptr_t)symval + addend;
break;
- default:
- SysDebug("Elf32Relocate: Unknown machine type %i", hdr->machine);
- do_relocate = elf_doRelocate_unk;
- fail = 1;
+ // Absolute Value of a symbol (S)
+ case R_X86_64_GLOB_DAT:
+ TRACE("R_X86_64_GLOB_DAT *0x%x = %p", ptr, symval); if(0)
+ case R_X86_64_JUMP_SLOT:
+ TRACE("R_X86_64_JUMP_SLOT *0x%x = %p", ptr, symval);
+ *ptr = (intptr_t)symval;
break;
- }
-
- TRACE("do_relocate = %p (%p or %p)", do_relocate, &elf_doRelocate_386, &elf_doRelocate_arm);
- #define _doRelocate(r_info, ptr, bRela, addend) \
- do_relocate(&reloc_info, r_info, ptr, addend, bRela);
-
- tElfRelocInfo reloc_info = {
- .Base = Base,
- .iBaseDiff = iBaseDiff,
- .strtab = dynstrtab,
- .symtab = dynsymtab
- };
+ // Base Address (B+A)
+ case R_X86_64_RELATIVE:
+ TRACE("R_X86_64_RELATIVE *0x%x = 0x%x + 0x%x", ptr, Info->iBaseDiff, addend);
+ *ptr = Info->iBaseDiff + addend;
+ break;
- // Parse Relocation Entries
- if(rel && relSz)
- {
- Elf32_Word *ptr;
- TRACE("rel=0x%x, relSz=0x%x, relEntSz=0x%x", rel, relSz, relEntSz);
- int max = relSz / relEntSz;
- for( int i = 0; i < max; i++ )
- {
- ptr = (void*)(iBaseDiff + rel[i].r_offset);
- fail |= _doRelocate(rel[i].r_info, ptr, 0, *ptr);
- }
- }
- // Parse Relocation Entries
- if(rela && relaSz)
- {
- Elf32_Word *ptr;
- TRACE("rela=0x%x, relaSz=0x%x, relaEntSz=0x%x", rela, relaSz, relaEntSz);
- int count = relaSz / relaEntSz;
- for( int i = 0; i < count; i++ )
- {
- ptr = (void*)(iBaseDiff + rela[i].r_offset);
- fail |= _doRelocate(rel[i].r_info, ptr, 1, rela[i].r_addend);
- }
- }
-
- // === Process PLT (Procedure Linkage Table) ===
- if(plt && pltSz)
- {
- Elf32_Word *ptr;
- TRACE("Relocate PLT, plt=0x%x", plt);
- if(pltType == DT_REL)
+ case R_X86_64_COPY: {
+ void *old_symval = symval;
+ GetSymbol(Info->strtab + sym->st_name, &symval, &size, Info->Base);
+ if( symval == old_symval )
{
- Elf32_Rel *pltRel = plt;
- int count = pltSz / sizeof(Elf32_Rel);
- TRACE("PLT Reloc Type = Rel, %i entries", count);
- for(int i = 0; i < count; i ++)
+ if( ELF64_ST_BIND(sym->st_info) != STB_WEAK )
{
- ptr = (void*)(iBaseDiff + pltRel[i].r_offset);
- fail |= _doRelocate(pltRel[i].r_info, ptr, 0, *ptr);
+ WARNING("sym={val:%p,size:0x%x,info:0x%x,other:0x%x,shndx:%i}",
+ sym->st_value, sym->st_size, sym->st_info, sym->st_other, sym->st_shndx);
+ WARNING("Can't find required external symbol '%s' for R_X86_64_COPY", Info->strtab + sym->st_name);
+ return 1;
}
+ // Don't bother doing the memcpy
+ TRACE("R_X86_64_COPY (%p, %p, %i)", ptr, symval, size);
}
else
{
- Elf32_Rela *pltRela = plt;
- int count = pltSz / sizeof(Elf32_Rela);
- TRACE("PLT Reloc Type = Rela, %i entries", count);
- for(int i=0;i<count;i++)
- {
- ptr = (void*)(iRealBase + pltRela[i].r_offset);
- fail |= _doRelocate(pltRela[i].r_info, ptr, 1, pltRela[i].r_addend);
- }
- }
- }
-
- // Re-set readonly
- for( int i = 0; i < iSegmentCount; i ++ )
- {
- // If load and not writable
- if(phtab[i].Type == PT_LOAD && !(phtab[i].Flags & PF_W) ) {
- uintptr_t addr = phtab[i].VAddr + iBaseDiff;
- uintptr_t end = addr + phtab[i].MemSize;
- for( ; addr < end; addr += PAGE_SIZE )
- _SysSetMemFlags(addr, 1, 1); // Unset RO
+ TRACE("R_X86_64_COPY (%p, %p, %i)", ptr, symval, size);
+ memcpy(ptr, symval, size);
}
+ break; }
+ default:
+ WARNING("Unknown Relocation, %i", ELF64_R_TYPE(r_info));
+ return 2;
}
-
- if( fail ) {
- TRACE("ElfRelocate: Failure");
- return NULL;
- }
-
- #undef _doRelocate
-
- TRACE("RETURN 0x%x to %p", hdr->entrypoint + iBaseDiff, __builtin_return_address(0));
- return (void*)(intptr_t)( hdr->entrypoint + iBaseDiff );
+ return 0;
}
-int Elf32GetSymbolVars(void *Base, Elf32_Sym** symtab, Elf32_Word** pBuckets, const char **dynstrtab, uintptr_t* piBaseDiff)
+Elf64_RelocFcn* Elf64_GetRelocFcn(unsigned Machine)
{
- Elf32_Dyn *dynTab = NULL;
- uintptr_t iBaseDiff = -1;
- Elf32_Ehdr *hdr = Base;
- Elf32_Phdr *phtab = (void*)( (uintptr_t)Base + hdr->phoff );
- for( int i = 0; i < hdr->phentcount; i ++ )
- {
- if(phtab[i].Type == PT_LOAD && iBaseDiff > phtab[i].VAddr)
- iBaseDiff = phtab[i].VAddr;
- if( phtab[i].Type == PT_DYNAMIC ) {
- dynTab = (void*)(intptr_t)phtab[i].VAddr;
- }
- }
- if( !dynTab ) {
- SysDebug("ERROR - Unable to find DYNAMIC segment in %p", Base);
- return 1;
- }
- iBaseDiff = (intptr_t)Base - iBaseDiff; // Make iBaseDiff actually the diff
- dynTab = (void*)( (intptr_t)dynTab + iBaseDiff );
- for( int i = 0; dynTab[i].d_tag != DT_NULL; i++)
- {
- switch(dynTab[i].d_tag)
- {
- // --- Symbol Table ---
- case DT_SYMTAB:
- *symtab = (void*)((intptr_t)dynTab[i].d_val + iBaseDiff); // Rebased in Relocate
- break;
- case DT_STRTAB:
- *dynstrtab = (void*)((intptr_t)dynTab[i].d_val + iBaseDiff);
- break;
- // --- Hash Table --
- case DT_HASH:
- *pBuckets = (void*)((intptr_t)dynTab[i].d_val + iBaseDiff);
- break;
- }
- }
-
- if( !*symtab ) {
- SysDebug("ERRO - No DT_SYMTAB in %p", Base);
- return 1;
- }
- if( !*pBuckets ) {
- SysDebug("ERRO - No DT_HASH in %p", Base);
- return 1;
- }
- if( !*dynstrtab ) {
- SysDebug("ERRO - No DT_STRTAB in %p", Base);
- return 1;
- }
-
- // ... ok... maybe they haven't been relocated
- if( (uintptr_t)*symtab < (uintptr_t)Base )
+ switch(Machine)
{
- SysDebug("Executable not yet relocated (symtab,pBuckets,dynstrtab = %p,%p,%p + 0x%x)",
- *symtab,*pBuckets,*dynstrtab, iBaseDiff);
- *symtab = (void*)( (uintptr_t)*symtab + iBaseDiff );
- *pBuckets = (void*)( (uintptr_t)*pBuckets + iBaseDiff );
- *dynstrtab = (void*)( (uintptr_t)*dynstrtab + iBaseDiff );
+ case EM_X86_64: return elf_doRelocate_x86_64;
+ default: return NULL;
}
- *piBaseDiff = iBaseDiff;
- return 0;
}
-int Elf32GetSymbolInfo(void *Base, const char *Name, void **Addr, size_t *Size, int* Section, int *Binding, int *Type)
-{
- // Locate the tables
- uintptr_t iBaseDiff = -1;
- Elf32_Sym *symtab = NULL;
- Elf32_Word *pBuckets = NULL;
- const char *dynstrtab = NULL;
- if( Elf32GetSymbolVars(Base, &symtab, &pBuckets, &dynstrtab, &iBaseDiff) )
- return 1;
-
- int nbuckets = pBuckets[0];
-// int iSymCount = pBuckets[1];
- pBuckets = &pBuckets[2];
- Elf32_Word* pChains = &pBuckets[ nbuckets ];
- assert(pChains);
-
- // Get hash
- int iNameHash = ElfHashString(Name);
- iNameHash %= nbuckets;
-
- // Walk Chain
- int idx = pBuckets[ iNameHash ];
- do {
- const Elf32_Sym *sym = &symtab[idx];
- assert(sym);
- if( strcmp(dynstrtab + sym->st_name, Name) == 0 )
- {
- TRACE("*sym = {value:0x%x,size:0x%x,info:0x%x,other:0x%x,shndx:%i}",
- sym->st_value, sym->st_size, sym->st_info,
- sym->st_other, sym->st_shndx);
- if(Addr) *Addr = (void*)(intptr_t)( sym->st_value );
- if(Size) *Size = sym->st_size;
- if(Binding) *Binding = ELF32_ST_BIND(sym->st_info);
- if(Type) *Type = ELF32_ST_TYPE(sym->st_info);
- if(Section) *Section = sym->st_shndx;
- return 0;
- }
- } while( (idx = pChains[idx]) != STN_UNDEF && idx != pBuckets[iNameHash] );
-
- TRACE("No symbol");
- return 1;
-}
+#endif // SUPPORT_ELF64
-int Elf32GetSymbol(void *Base, const char *Name, void **ret, size_t *Size)
-{
- int section, binding;
- TRACE("Elf32GetSymbol(%p,%s,...)", Base, Name);
- if( Elf32GetSymbolInfo(Base, Name, ret, Size, §ion, &binding, NULL) )
- return 0;
- if( section == SHN_UNDEF ) {
- TRACE("Elf32GetSymbol: Undefined %p", *ret, (Size?*Size:0), section);
- return 0;
- }
- if( binding == STB_WEAK ) {
- TRACE("Elf32GetSymbol: Weak, return %p+0x%x,section=%i", *ret, (Size?*Size:0), section);
- return 2;
- }
- TRACE("Elf32GetSymbol: Found %p+0x%x,section=%i", *ret, (Size?*Size:0), section);
- return 1;
-}
#ifdef SUPPORT_ELF64
+#if 0
typedef int (*t_elf64_doreloc)(void *Base, const char *strtab, Elf64_Sym *symtab, Elf64_Xword r_info, void *ptr, Elf64_Sxword addend);
int _Elf64DoReloc_X86_64(void *Base, const char *strtab, Elf64_Sym *symtab, Elf64_Xword r_info, void *ptr, Elf64_Sxword addend)
return 0;
}
#endif
+#endif
uint32_t ElfHashString(const char *name)
{
git.ucc.asn.au / tpg / acess2.git / blobdiff
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