* elf.c
* - ELF32/ELF64 relocation
*/
-#define DEBUG 0
+#ifndef DEBUG // This code is #include'd from the kernel, so DEBUG may already be defined
+# define DEBUG 0
+#endif
#include "common.h"
#include <stdint.h>
# define DEBUGS(...)
#endif
-//#if BITS > 32
+#ifndef DISABLE_ELF64
# define SUPPORT_ELF64
-//#endif
+#endif
// === CONSTANTS ===
#if DEBUG
int ElfGetSymbol(void *Base, const char *Name, void **Ret, size_t *Size);
void *Elf32Relocate(void *Base, char **envp, const char *Filename);
int Elf32GetSymbol(void *Base, const char *Name, void **Ret, size_t *Size);
+void elf_doRelocate_386(uint32_t r_info, uint32_t *ptr, Elf32_Addr addend, int type, int bRela, const char *Sym, intptr_t iBaseDiff);
+void elf_doRelocate_arm(uint32_t r_info, uint32_t *ptr, Elf32_Addr addend, int type, int bRela, const char *Sym, intptr_t iBaseDiff);
#ifdef SUPPORT_ELF64
void *Elf64Relocate(void *Base, char **envp, const char *Filename);
int Elf64GetSymbol(void *Base, const char *Name, void **Ret, size_t *Size);
char *dynstrtab = NULL; // .dynamic String Table
Elf32_Sym *dynsymtab;
void (*do_relocate)(uint32_t t_info, uint32_t *ptr, Elf32_Addr addend, int Type, int bRela, const char *Sym, intptr_t iBaseDiff);
+ auto void _doRelocate(uint32_t r_info, uint32_t *ptr, int bRela, Elf32_Addr addend);
DEBUGS("ElfRelocate: (Base=0x%x)", Base);
// Parse Program Header to get Dynamic Table
- phtab = Base + hdr->phoff;
+ phtab = (void*)( (uintptr_t)Base + hdr->phoff );
iSegmentCount = hdr->phentcount;
for(i=0;i<iSegmentCount;i++)
{
int Elf32GetSymbol(void *Base, const char *Name, void **ret, size_t *Size)
{
Elf32_Ehdr *hdr = Base;
- Elf32_Sym *symtab;
+ Elf32_Sym *symtab = NULL;
int nbuckets = 0;
-// int iSymCount = 0;
- int i;
- Elf32_Word *pBuckets;
+ Elf32_Word *pBuckets = NULL;
Elf32_Word *pChains;
uint32_t iNameHash;
- const char *dynstrtab;
+ const char *dynstrtab = NULL;
uintptr_t iBaseDiff = -1;
Elf32_Phdr *phtab;
Elf32_Dyn *dynTab = NULL;
+ int i;
// Locate the tables
- phtab = (void*)( Base + hdr->phoff );
+ phtab = (void*)( (uintptr_t)Base + hdr->phoff );
for( i = 0; i < hdr->phentcount; i ++ )
{
if(phtab[i].Type == PT_LOAD && iBaseDiff > phtab[i].VAddr)
}
}
+ if( !symtab ) {
+ SysDebug("ERRO - No DT_SYMTAB in %p", Base);
+ return 0;
+ }
+ if( !pBuckets ) {
+ SysDebug("ERRO - No DT_HASH in %p", Base);
+ return 0;
+ }
+ if( !dynstrtab ) {
+ SysDebug("ERRO - No DT_STRTAB in %p", Base);
+ return 0;
+ }
+
+ // ... ok... maybe they haven't been relocated
+ if( (uintptr_t)symtab < (uintptr_t)Base )
+ {
+ symtab = (void*)( (uintptr_t)symtab + iBaseDiff );
+ pBuckets = (void*)( (uintptr_t)pBuckets + iBaseDiff );
+ dynstrtab = (void*)( (uintptr_t)dynstrtab + iBaseDiff );
+ SysDebug("Executable not yet relocated");
+ }
+
nbuckets = pBuckets[0];
// iSymCount = pBuckets[1];
pBuckets = &pBuckets[2];
pChains = &pBuckets[ nbuckets ];
-
+
// Get hash
iNameHash = ElfHashString(Name);
iNameHash %= nbuckets;
// Walk Chain
i = pBuckets[ iNameHash ];
if(symtab[i].shndx != SHN_UNDEF && strcmp(dynstrtab + symtab[i].nameOfs, Name) == 0) {
- *ret = (void*) (intptr_t) symtab[ i ].value + iBaseDiff;
+ *ret = (void*)( (uintptr_t) symtab[ i ].value + iBaseDiff );
if(Size) *Size = symtab[i].size;
return 1;
}
{
i = pChains[i];
if(symtab[i].shndx != SHN_UNDEF && strcmp(dynstrtab + symtab[ i ].nameOfs, Name) == 0) {
- *ret = (void*)(intptr_t)symtab[ i ].value + iBaseDiff;
+ *ret = (void*)( (uintptr_t)symtab[ i ].value + iBaseDiff );
if(Size) *Size = symtab[i].size;
return 1;
}
int j;
// Locate the tables
- phtab = (void*)( Base + hdr->e_phoff );
+ phtab = (void*)( (intptr_t)Base + hdr->e_phoff );
for( i = 0; i < hdr->e_phnum; i ++ )
{
if(phtab[i].p_type == PT_LOAD && iBaseDiff > phtab[i].p_vaddr)
// Walk Chain
i = pBuckets[ iNameHash ];
if(symtab[i].st_shndx != SHN_UNDEF && strcmp(dynstrtab + symtab[i].st_name, Name) == 0) {
- *Ret = (void*) (intptr_t) symtab[i].st_value + iBaseDiff;
+ *Ret = (void*)( (intptr_t)symtab[i].st_value + iBaseDiff );
if(Size) *Size = symtab[i].st_size;
DEBUGS("%s = %p", Name, *Ret);
return 1;
{
i = pChains[i];
if(symtab[i].st_shndx != SHN_UNDEF && strcmp(dynstrtab + symtab[i].st_name, Name) == 0) {
- *Ret = (void*)(intptr_t)symtab[i].st_value + iBaseDiff;
+ *Ret = (void*)((intptr_t)symtab[i].st_value + iBaseDiff);
if(Size) *Size = symtab[i].st_size;
DEBUGS("%s = %p", Name, *Ret);
return 1;