#endif
// === PROTOTYPES ===
-void elf_doRelocate(Uint r_info, Uint32 *ptr, Uint32 addend, Elf32_Sym *symtab, Uint base);
-Uint ElfHashString(char *name);
+Uint32 ElfHashString(const char *name);
// === CODE ===
/**
char *dynstrtab = NULL; // .dynamic String Table
Elf32_Sym *dynsymtab;
- DEBUGS("ElfRelocate: (Base=0x%x)\n", Base);
+ DEBUGS("ElfRelocate: (Base=0x%x)", Base);
// Check magic header
// Find Dynamic Section
if(phtab[i].Type == PT_DYNAMIC) {
if(dynamicTab) {
- DEBUGS(" WARNING - elf_relocate: Multiple PT_DYNAMIC segments\n");
+ DEBUGS(" WARNING - elf_relocate: Multiple PT_DYNAMIC segments");
continue;
}
dynamicTab = (void *) (intptr_t) phtab[i].VAddr;
// Page Align real base
iRealBase &= ~0xFFF;
- DEBUGS(" elf_relocate: True Base = 0x%x, Compiled Base = 0x%x\n", Base, iRealBase);
+ DEBUGS(" elf_relocate: True Base = 0x%x, Compiled Base = 0x%x", Base, iRealBase);
// Adjust "Real" Base
iBaseDiff = (intptr_t)Base - iRealBase;
- hdr->entrypoint += iBaseDiff; // Adjust Entrypoint
+// hdr->entrypoint += iBaseDiff; // Adjust Entrypoint
// Check if a PT_DYNAMIC segement was found
if(!dynamicTab) {
- SysDebug(" elf_relocate: No PT_DYNAMIC segment in image, returning\n");
- return (void *)hdr->entrypoint;
+ SysDebug(" elf_relocate: No PT_DYNAMIC segment in image %p, returning", Base);
+ return (void *)hdr->entrypoint + iBaseDiff;
}
// Adjust Dynamic Table
{
// --- Symbol Table ---
case DT_SYMTAB:
- DEBUGS(" elf_relocate: DYNAMIC Symbol Table 0x%x (0x%x)\n",
+ DEBUGS(" elf_relocate: DYNAMIC Symbol Table 0x%x (0x%x)",
dynamicTab[j].d_val, dynamicTab[j].d_val + iBaseDiff);
- dynamicTab[j].d_val += iBaseDiff;
+ if(iBaseDiff != 0) dynamicTab[j].d_val += iBaseDiff;
dynsymtab = (void*)(dynamicTab[j].d_val);
- hdr->misc.SymTable = dynamicTab[j].d_val; // Saved in unused bytes of ident
+// hdr->misc.SymTable = dynamicTab[j].d_val; // Saved in unused bytes of ident
break;
// --- String Table ---
case DT_STRTAB:
- DEBUGS(" elf_relocate: DYNAMIC String Table 0x%x (0x%x)\n",
+ DEBUGS(" elf_relocate: DYNAMIC String Table 0x%x (0x%x)",
dynamicTab[j].d_val, dynamicTab[j].d_val + iBaseDiff);
- dynamicTab[j].d_val += iBaseDiff;
+ if(iBaseDiff != 0) dynamicTab[j].d_val += iBaseDiff;
dynstrtab = (void*)(dynamicTab[j].d_val);
break;
// --- Hash Table --
case DT_HASH:
- dynamicTab[j].d_val += iBaseDiff;
+ if(iBaseDiff != 0) dynamicTab[j].d_val += iBaseDiff;
iSymCount = ((Uint*)(dynamicTab[j].d_val))[1];
- hdr->misc.HashTable = dynamicTab[j].d_val; // Saved in unused bytes of ident
+// hdr->misc.HashTable = dynamicTab[j].d_val; // Saved in unused bytes of ident
break;
}
}
if(dynsymtab == NULL) {
- SysDebug("ld-acess.so - WARNING: No Dynamic Symbol table, returning\n");
- return (void *) hdr->entrypoint;
+ SysDebug("ld-acess.so - WARNING: No Dynamic Symbol table in %p, returning", hdr);
+ return (void *) hdr->entrypoint + iBaseDiff;
}
-
+
+ #if 0
// Alter Symbols to true base
for(i=0;i<iSymCount;i++)
{
dynsymtab[i].value += iBaseDiff;
dynsymtab[i].nameOfs += (intptr_t)dynstrtab;
- //DEBUGS("elf_relocate: Sym '%s' = 0x%x (relocated)\n", dynsymtab[i].name, dynsymtab[i].value);
+ //DEBUGS("elf_relocate: Sym '%s' = 0x%x (relocated)", dynsymtab[i].name, dynsymtab[i].value);
}
+ #endif
// === Add to loaded list (can be imported now) ===
AddLoaded( Filename, Base );
// === Parse Relocation Data ===
- DEBUGS(" elf_relocate: dynamicTab = 0x%x\n", dynamicTab);
+ DEBUGS(" elf_relocate: dynamicTab = 0x%x", dynamicTab);
for( j = 0; dynamicTab[j].d_tag != DT_NULL; j++)
{
switch(dynamicTab[j].d_tag)
{
// --- Shared Library Name ---
case DT_SONAME:
- DEBUGS(" elf_relocate: .so Name '%s'\n", dynstrtab+dynamicTab[j].d_val);
+ DEBUGS(" elf_relocate: .so Name '%s'", dynstrtab+dynamicTab[j].d_val);
break;
// --- Needed Library ---
case DT_NEEDED:
libPath = dynstrtab + dynamicTab[j].d_val;
- DEBUGS(" Required Library '%s'\n", libPath);
+ DEBUGS(" Required Library '%s'", libPath);
if(LoadLibrary(libPath, NULL, envp) == 0) {
#if DEBUG
- DEBUGS(" elf_relocate: Unable to load '%s'\n", libPath);
+ DEBUGS(" elf_relocate: Unable to load '%s'", libPath);
#else
- SysDebug("Unable to load required library '%s'\n", libPath);
+ SysDebug("Unable to load required library '%s'", libPath);
#endif
return 0;
}
// --- Unknown ---
default:
if(dynamicTab[j].d_tag > DT_JMPREL) continue;
- //DEBUGS(" elf_relocate: %i-%i = %s,0x%x\n",
+ //DEBUGS(" elf_relocate: %i-%i = %s,0x%x",
// i,j, csaDT_NAMES[dynamicTab[j].d_tag],dynamicTab[j].d_val);
break;
}
}
- DEBUGS(" elf_relocate: Beginning Relocation\n");
+ DEBUGS(" elf_relocate: Beginning Relocation");
+
+ void elf_doRelocate(Uint r_info, Uint32 *ptr, Uint32 addend, Elf32_Sym *symtab)
+ {
+ int type = ELF32_R_TYPE(r_info);
+ int sym = ELF32_R_SYM(r_info);
+ Uint32 val;
+ const char *symname = dynstrtab + symtab[sym].nameOfs;
+ switch( type )
+ {
+ // Standard 32 Bit Relocation (S+A)
+ case R_386_32:
+ val = (intptr_t) GetSymbol( symname );
+ DEBUGS(" elf_doRelocate: R_386_32 *0x%x += 0x%x('%s')",
+ ptr, val, symname);
+ *ptr = val + addend;
+ break;
+
+ // 32 Bit Relocation wrt. Offset (S+A-P)
+ case R_386_PC32:
+ DEBUGS(" elf_doRelocate: #%i: '%s'", sym, symname);
+ val = (intptr_t) GetSymbol( symname );
+ DEBUGS(" elf_doRelocate: R_386_PC32 *0x%x = 0x%x + 0x%x - 0x%x",
+ ptr, *ptr, val, (Uint)ptr );
+ *ptr = val + addend - (intptr_t)ptr;
+ //*ptr = val + addend - ((Uint)ptr - iBaseDiff);
+ break;
+
+ // Absolute Value of a symbol (S)
+ case R_386_GLOB_DAT:
+ case R_386_JMP_SLOT:
+ DEBUGS(" elf_doRelocate: #%i: '%s'", sym, symname);
+ val = (intptr_t) GetSymbol( symname );
+ DEBUGS(" elf_doRelocate: %s *0x%x = 0x%x", csaR_NAMES[type], ptr, val);
+ *ptr = val;
+ break;
+
+ // Base Address (B+A)
+ case R_386_RELATIVE:
+ DEBUGS(" elf_doRelocate: R_386_RELATIVE *0x%x = 0x%x + 0x%x", ptr, iBaseDiff, addend);
+ *ptr = iBaseDiff + addend;
+ break;
+
+ default:
+ DEBUGS(" elf_doRelocate: Rel 0x%x: 0x%x,%s", ptr, sym, csaR_NAMES[type]);
+ break;
+ }
+ }
// Parse Relocation Entries
if(rel && relSz)
{
Uint32 *ptr;
- DEBUGS(" elf_relocate: rel=0x%x, relSz=0x%x, relEntSz=0x%x\n", rel, relSz, relEntSz);
+ DEBUGS(" elf_relocate: rel=0x%x, relSz=0x%x, relEntSz=0x%x", rel, relSz, relEntSz);
j = relSz / relEntSz;
for( i = 0; i < j; i++ )
{
- //DEBUGS(" Rel %i: 0x%x+0x%x\n", i, iBaseDiff, rel[i].r_offset);
+ //DEBUGS(" Rel %i: 0x%x+0x%x", i, iBaseDiff, rel[i].r_offset);
ptr = (void*)(iBaseDiff + rel[i].r_offset);
- elf_doRelocate(rel[i].r_info, ptr, *ptr, dynsymtab, iBaseDiff);
+ elf_doRelocate(rel[i].r_info, ptr, *ptr, dynsymtab);
}
}
// Parse Relocation Entries
if(rela && relaSz)
{
Uint32 *ptr;
- DEBUGS(" elf_relocate: rela=0x%x, relaSz=0x%x, relaEntSz=0x%x\n", rela, relaSz, relaEntSz);
+ DEBUGS(" elf_relocate: rela=0x%x, relaSz=0x%x, relaEntSz=0x%x", rela, relaSz, relaEntSz);
j = relaSz / relaEntSz;
for( i = 0; i < j; i++ )
{
ptr = (void*)(iBaseDiff + rela[i].r_offset);
- elf_doRelocate(rel[i].r_info, ptr, rela[i].r_addend, dynsymtab, iBaseDiff);
+ elf_doRelocate(rel[i].r_info, ptr, rela[i].r_addend, dynsymtab);
}
}
if(plt && pltSz)
{
Uint32 *ptr;
- DEBUGS(" elf_relocate: Relocate PLT, plt=0x%x\n", plt);
+ DEBUGS(" elf_relocate: Relocate PLT, plt=0x%x", plt);
if(pltType == DT_REL)
{
Elf32_Rel *pltRel = plt;
j = pltSz / sizeof(Elf32_Rel);
- DEBUGS(" elf_relocate: PLT Reloc Type = Rel, %i entries\n", j);
+ DEBUGS(" elf_relocate: PLT Reloc Type = Rel, %i entries", j);
for(i=0;i<j;i++)
{
ptr = (void*)(iBaseDiff + pltRel[i].r_offset);
- elf_doRelocate(pltRel[i].r_info, ptr, *ptr, dynsymtab, iRealBase);
+ elf_doRelocate(pltRel[i].r_info, ptr, *ptr, dynsymtab);
}
}
else
{
Elf32_Rela *pltRela = plt;
j = pltSz / sizeof(Elf32_Rela);
- DEBUGS(" elf_relocate: PLT Reloc Type = Rela, %i entries\n", j);
+ DEBUGS(" elf_relocate: PLT Reloc Type = Rela, %i entries", j);
for(i=0;i<j;i++)
{
ptr = (void*)(iRealBase + pltRela[i].r_offset);
- elf_doRelocate(pltRela[i].r_info, ptr, pltRela[i].r_addend, dynsymtab, iRealBase);
+ elf_doRelocate(pltRela[i].r_info, ptr, pltRela[i].r_addend, dynsymtab);
}
}
}
- DEBUGS("ElfRelocate: RETURN 0x%x", hdr->entrypoint);
- return (void*)hdr->entrypoint;
+ DEBUGS("ElfRelocate: RETURN 0x%x", hdr->entrypoint + iBaseDiff);
+ return (void*)hdr->entrypoint + iBaseDiff;
}
-void elf_doRelocate(Uint r_info, Uint32 *ptr, Uint32 addend, Elf32_Sym *symtab, Uint base)
-{
- int type = ELF32_R_TYPE(r_info);
- int sym = ELF32_R_SYM(r_info);
- Uint32 val;
- switch( type )
- {
- // Standard 32 Bit Relocation (S+A)
- case R_386_32:
- val = (intptr_t) GetSymbol( symtab[sym].name );
- DEBUGS(" elf_doRelocate: R_386_32 *0x%x += 0x%x('%s')\n",
- ptr, val, symtab[sym].name);
- *ptr = val + addend;
- break;
-
- // 32 Bit Relocation wrt. Offset (S+A-P)
- case R_386_PC32:
- DEBUGS(" elf_doRelocate: #%i: '%s'\n", sym, symtab[sym].name);
- val = (intptr_t) GetSymbol( symtab[sym].name );
- DEBUGS(" elf_doRelocate: R_386_PC32 *0x%x = 0x%x + 0x%x - 0x%x\n",
- ptr, *ptr, val, (Uint)ptr );
- *ptr = val + addend - (intptr_t)ptr;
- //*ptr = val + addend - ((Uint)ptr - base);
- break;
-
- // Absolute Value of a symbol (S)
- case R_386_GLOB_DAT:
- case R_386_JMP_SLOT:
- DEBUGS(" elf_doRelocate: #%i: '%s'\n", sym, symtab[sym].name);
- val = (intptr_t) GetSymbol( symtab[sym].name );
- DEBUGS(" elf_doRelocate: %s *0x%x = 0x%x\n", csaR_NAMES[type], ptr, val);
- *ptr = val;
- break;
-
- // Base Address (B+A)
- case R_386_RELATIVE:
- DEBUGS(" elf_doRelocate: R_386_RELATIVE *0x%x = 0x%x + 0x%x\n", ptr, base, addend);
- *ptr = base + addend;
- break;
-
- default:
- DEBUGS(" elf_doRelocate: Rel 0x%x: 0x%x,%s\n", ptr, sym, csaR_NAMES[type]);
- break;
- }
-
-}
/**
- * \fn int ElfGetSymbol(Uint Base, char *name, void **ret)
+ * \fn int ElfGetSymbol(Uint Base, const char *name, void **ret)
*/
-int ElfGetSymbol(void *Base, char *Name, void **ret)
+int ElfGetSymbol(void *Base, const char *Name, void **ret)
{
Elf32_Ehdr *hdr = Base;
Elf32_Sym *symtab;
int nbuckets = 0;
int iSymCount = 0;
int i;
- Uint *pBuckets;
- Uint *pChains;
+ Uint32 *pBuckets;
+ Uint32 *pChains;
Uint iNameHash;
+ const char *dynstrtab;
+ uintptr_t iBaseDiff = -1;
- //DEBUGS("ElfGetSymbol: (Base=0x%x, Name='%s')\n", Base, Name);
+ //DEBUGS("ElfGetSymbol: (Base=0x%x, Name='%s')", Base, Name);
+ #if 0
+ pBuckets = (void *) (intptr_t) hdr->misc.HashTable;
+ symtab = (void *) (intptr_t) hdr->misc.SymTable;
+ dynstrtab = (void *) (intptr_t) hdr->misc.StrTab;
+ #else
+ dynstrtab = NULL;
+ pBuckets = NULL;
+ symtab = NULL;
+ #endif
// Catch the current executable
- #if 0
- if( !hdr->misc.HashTable )
+ if( !pBuckets )
{
Elf32_Phdr *phtab;
Elf32_Dyn *dynTab = NULL;
phtab = (void*)( Base + hdr->phoff );
for( 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*)phtab[i].VAddr;
- break ;
}
}
if( !dynTab ) {
- SysDebug("ERROR - Unable to find DYNAMIC segment in %p", (void*)Base);
+ SysDebug("ERROR - Unable to find DYNAMIC segment in %p");
return 0;
}
+ iBaseDiff = (intptr_t)Base - iBaseDiff; // Make iBaseDiff actually the diff
+ dynTab = (void*)( (intptr_t)dynTab + iBaseDiff );
for( j = 0; dynTab[j].d_tag != DT_NULL; j++)
{
{
// --- Symbol Table ---
case DT_SYMTAB:
- hdr->misc.SymTable = dynTab[j].d_val;
+ symtab = (void*)(intptr_t) dynTab[j].d_val; // Rebased in Relocate
+ break;
+ case DT_STRTAB:
+ dynstrtab = (void*)(intptr_t) dynTab[j].d_val;
break;
// --- Hash Table --
case DT_HASH:
- hdr->misc.HashTable = dynTab[j].d_val;
+ pBuckets = (void*)(intptr_t) dynTab[j].d_val;
break;
}
}
- }
- #endif
-
- if( !hdr->misc.SymTable || !hdr->misc.HashTable ) {
- return 0;
+
+ #if 0
+ hdr->misc.HashTable = pBucktets;
+ hdr->misc.SymTable = symtab;
+ hdr->misc.StrTab = dynstrtab;
+ #endif
}
- pBuckets = (void *) (intptr_t) hdr->misc.HashTable;
- symtab = (void *) (intptr_t) hdr->misc.SymTable;
-
nbuckets = pBuckets[0];
iSymCount = pBuckets[1];
pBuckets = &pBuckets[2];
// Get hash
iNameHash = ElfHashString(Name);
iNameHash %= nbuckets;
- //DEBUGS(" ElfGetSymbol: iNameHash = 0x%x\n", iNameHash);
+ //DEBUGS(" ElfGetSymbol: iNameHash = 0x%x", iNameHash);
// Walk Chain
i = pBuckets[ iNameHash ];
- //DEBUGS(" ElfGetSymbol: strcmp(Name, \"%s\")\n", symtab[i].name);
- if(symtab[i].shndx != SHN_UNDEF && strcmp(symtab[i].name, Name) == 0) {
- *ret = (void*) (intptr_t) symtab[ i ].value;
+ //DEBUGS(" ElfGetSymbol: strcmp(Name, \"%s\")", symtab[i].name);
+ if(symtab[i].shndx != SHN_UNDEF && strcmp(dynstrtab + symtab[i].nameOfs, Name) == 0) {
+ *ret = (void*) (intptr_t) symtab[ i ].value + iBaseDiff;
return 1;
}
- //DEBUGS(" ElfGetSymbol: Hash of first = 0x%x\n", ElfHashString( symtab[i].name ) % nbuckets);
+ //DEBUGS(" ElfGetSymbol: Hash of first = 0x%x", ElfHashString( symtab[i].name ) % nbuckets);
while(pChains[i] != STN_UNDEF)
{
- //DEBUGS(" pChains[%i] = %i\n", i, pChains[i]);
+ //DEBUGS(" pChains[%i] = %i", i, pChains[i]);
i = pChains[i];
- //DEBUGS(" ElfGetSymbol: strcmp(Name, \"%s\")\n", symtab[ i ].name);
- if(symtab[i].shndx != SHN_UNDEF && strcmp(symtab[ i ].name, Name) == 0) {
- //DEBUGS("ElfGetSymbol: RETURN 1, '%s' = 0x%x\n", symtab[ i ].name, symtab[ i ].value);
- *ret = (void*)(intptr_t)symtab[ i ].value;
+ //DEBUGS(" ElfGetSymbol: strcmp(Name, \"%s\")", symtab[ i ].name);
+ if(symtab[i].shndx != SHN_UNDEF && strcmp(dynstrtab + symtab[ i ].nameOfs, Name) == 0) {
+ //DEBUGS("ElfGetSymbol: RETURN 1, '%s' = 0x%x", symtab[ i ].name, symtab[ i ].value);
+ *ret = (void*)(intptr_t)symtab[ i ].value + iBaseDiff;
return 1;
}
}
- //DEBUGS("ElfGetSymbol: RETURN 0, Symbol '%s' not found\n", Name);
+ //DEBUGS("ElfGetSymbol: RETURN 0, Symbol '%s' not found", Name);
return 0;
}
-Uint ElfHashString(char *name)
+Uint32 ElfHashString(const char *name)
{
- Uint h = 0, g;
+ Uint32 h = 0, g;
while(*name)
{
- h = (h << 4) + *name++;
+ h = (h << 4) + *(Uint8*)name++;
if( (g = h & 0xf0000000) )
h ^= g >> 24;
h &= ~g;
git.ucc.asn.au / tpg / acess2.git / blobdiff
UCC git Repository :: git.ucc.asn.au