#include "elf32.h"
#include "elf64.h"
-#define DEBUG 0
+#define DEBUG 1
#if DEBUG
# define DEBUGS(v...) SysDebug("ld-acess - " v)
# define DEBUGS(...)
#endif
+#if BITS > 32
+# define SUPPORT_ELF64
+#endif
+
// === 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"};
// === PROTOTYPES ===
void *ElfRelocate(void *Base, char **envp, const char *Filename);
+ int ElfGetSymbol(void *Base, const char *Name, void **Ret);
void *Elf32Relocate(void *Base, char **envp, const char *Filename);
+ int Elf32GetSymbol(void *Base, const char *Name, void **Ret);
+#ifdef SUPPORT_ELF64
void *Elf64Relocate(void *Base, char **envp, const char *Filename);
- int ElfGetSymbol(void *Base, const char *Name, void **Ret);
int Elf64GetSymbol(void *Base, const char *Name, void **Ret);
- int Elf32GetSymbol(void *Base, const char *Name, void **Ret);
+#endif
Uint32 ElfHashString(const char *name);
// === CODE ===
{
case ELFCLASS32:
return Elf32Relocate(Base, envp, Filename);
+#ifdef SUPPORT_ELF64
case ELFCLASS64:
return Elf64Relocate(Base, envp, Filename);
+#endif
default:
SysDebug("ld-acess - ElfRelocate: Unknown file class %i", hdr->e_ident[4]);
return NULL;
}
}
-void *Elf64Relocate(void *Base, char **envp, const char *Filename)
+/**
+ * \fn int ElfGetSymbol(Uint Base, const char *name, void **ret)
+ */
+int ElfGetSymbol(void *Base, const char *Name, void **ret)
{
- int i;
- Elf64_Ehdr *hdr = Base;
- Elf64_Phdr *phtab;
- Elf64_Dyn *dyntab;
- Elf64_Addr compiledBase = -1, baseDiff;
- Elf64_Sym *symtab = NULL;
- char *strtab = NULL;
- Elf64_Word *hashtab = NULL;
- Elf64_Rel *rel = NULL;
- int rel_count = 0;
- Elf64_Rela *rela = NULL;
- int rela_count = 0;
- void *pltrel = NULL;
- int plt_size = 0, plt_type = 0;
-
- DEBUGS("Elf64Relocate: hdr = {");
- DEBUGS("Elf64Relocate: e_ident = '%.16s'", hdr->e_ident);
- DEBUGS("Elf64Relocate: e_type = 0x%x", hdr->e_type);
- DEBUGS("Elf64Relocate: e_machine = 0x%x", hdr->e_machine);
- DEBUGS("Elf64Relocate: e_version = 0x%x", hdr->e_version);
- DEBUGS("Elf64Relocate: e_entry = %p", hdr->e_entry);
- DEBUGS("Elf64Relocate: e_phoff = 0x%llx", hdr->e_phoff);
- DEBUGS("Elf64Relocate: e_shoff = 0x%llx", hdr->e_shoff);
- DEBUGS("Elf64Relocate: e_flags = 0x%x", hdr->e_flags);
- DEBUGS("Elf64Relocate: e_ehsize = 0x%x", hdr->e_ehsize);
- DEBUGS("Elf64Relocate: e_phentsize = 0x%x", hdr->e_phentsize);
- DEBUGS("Elf64Relocate: e_phnum = %i", hdr->e_phnum);
-
- // Scan for the dynamic table (and find the compiled base)
- phtab = Base + hdr->e_phoff;
- for( i = 0; i < hdr->e_phnum; i ++ )
- {
- if(phtab[i].p_type == PT_DYNAMIC)
- dyntab = (void *)(intptr_t)phtab[i].p_vaddr;
- if(phtab[i].p_type == PT_LOAD && compiledBase > phtab[i].p_vaddr)
- compiledBase = phtab[i].p_vaddr;
- }
-
- baseDiff = (Elf64_Addr)Base - compiledBase;
-
- DEBUGS("baseDiff = %p", baseDiff);
-
- if(dyntab == NULL) {
- SysDebug(" Elf64Relocate: No PT_DYNAMIC segment in image %p, returning", Base);
- return (void *)(hdr->e_entry + baseDiff);
- }
-
- dyntab = (void *)((Elf64_Addr)dyntab + baseDiff);
-
- // Parse the dynamic table (first pass)
- // - Search for String, Symbol and Hash tables
- for(i = 0; dyntab[i].d_tag != DT_NULL; i ++)
- {
- switch(dyntab[i].d_tag)
- {
- case DT_SYMTAB:
- dyntab[i].d_un.d_ptr += baseDiff;
- symtab = (void *)dyntab[i].d_un.d_ptr;
- break;
- case DT_STRTAB:
- dyntab[i].d_un.d_ptr += baseDiff;
- strtab = (void *)dyntab[i].d_un.d_ptr;
- break;
- case DT_HASH:
- dyntab[i].d_un.d_ptr += baseDiff;
- hashtab = (void *)dyntab[i].d_un.d_ptr;
- break;
- }
- }
-
- if( !symtab || !strtab || !hashtab ) {
- SysDebug("ld-acess - Elf64Relocate: Missing Symbol, string or hash table");
- return NULL;
- }
-
- // Ready for symbol use
- AddLoaded( Filename, Base );
-
- // Second pass on dynamic table
- for(i = 0; dyntab[i].d_tag != DT_NULL; i ++)
- {
- DEBUGS("dyntab[%i].d_tag = %i", i, dyntab[i].d_tag);
- switch(dyntab[i].d_tag)
- {
- case DT_SONAME: break;
-
- case DT_NEEDED: {
- char *libPath = strtab + dyntab[i].d_un.d_val;
- DEBUGS("Elf64Relocate: libPath = '%s'", libPath);
- if(LoadLibrary(libPath, NULL, envp) == 0) {
- SysDebug("ld-acess - Elf64Relocate: Unable to load '%s'", libPath);
- return NULL;
- }
- } break;
-
- // Relocation entries
- case DT_REL:
- dyntab[i].d_un.d_ptr += baseDiff;
- rel = (void *)dyntab[i].d_un.d_ptr;
- break;
- case DT_RELSZ:
- rel_count = dyntab[i].d_un.d_val / sizeof(Elf64_Rel);
- break;
- case DT_RELENT:
- if( dyntab[i].d_un.d_val != sizeof(Elf64_Rel) ) {
- SysDebug("ld-acess - Elf64Relocate: DT_RELENT(%i) != sizeof(Elf64_Rel)(%i)",
- dyntab[i].d_un.d_val, sizeof(Elf64_Rel));
- return NULL;
- }
- break;
- case DT_RELA:
- dyntab[i].d_un.d_ptr += baseDiff;
- rela = (void *)dyntab[i].d_un.d_ptr;
- break;
- case DT_RELASZ:
- rela_count = dyntab[i].d_un.d_val / sizeof(Elf64_Rela);
- break;
- case DT_RELAENT:
- if( dyntab[i].d_un.d_val != sizeof(Elf64_Rela) ) {
- SysDebug("ld-acess - Elf64Relocate: DT_RELAENT(%i) != sizeof(Elf64_Rela)(%i)",
- dyntab[i].d_un.d_val, sizeof(Elf64_Rela));
- return NULL;
- }
- break;
- case DT_JMPREL:
- dyntab[i].d_un.d_ptr += baseDiff;
- pltrel = (void *)dyntab[i].d_un.d_ptr;
- break;
- case DT_PLTREL:
- plt_type = dyntab[i].d_un.d_val;
- break;
- case DT_PLTRELSZ:
- plt_size = dyntab[i].d_un.d_val;
- break;
- }
- }
-
- // Relocation function
- void _Elf64DoReloc(Elf64_Xword r_info, void *ptr, Elf64_Sxword addend)
- {
- int sym = ELF64_R_SYM(r_info);
- int type = ELF64_R_TYPE(r_info);
- const char *symname = strtab + symtab[sym].st_name;
- switch( type )
- {
- case R_X86_64_NONE:
- break;
- case R_X86_64_64:
- *(uint64_t*)ptr = (uint64_t)GetSymbol(symname) + addend;
- break;
- case R_X86_64_COPY:
- break;
- case R_X86_64_GLOB_DAT:
- *(uint64_t*)ptr = (uint64_t)GetSymbol(symname);
- break;
- case R_X86_64_JUMP_SLOT:
- *(uint64_t*)ptr = (uint64_t)GetSymbol(symname);
- break;
- default:
- SysDebug("ld-acess - _Elf64DoReloc: Unknown relocation type %i", type);
- break;
- }
- }
-
- if( rel )
- {
- DEBUGS("rel_count = %i", rel_count);
- for( i = 0; i < rel_count; i ++ )
- {
- uint64_t *ptr = (void *)( rel[i].r_offset + baseDiff );
- _Elf64DoReloc( rel[i].r_info, ptr, *ptr);
- }
- }
-
- if( rela )
- {
- DEBUGS("rela_count = %i", rela_count);
- for( i = 0; i < rela_count; i ++ )
- {
- _Elf64DoReloc( rela[i].r_info, (void *)( rela[i].r_offset + baseDiff ), rela[i].r_addend );
- }
- }
+ Elf32_Ehdr *hdr = Base;
- if( pltrel && plt_type )
+ switch(hdr->e_ident[4])
{
- if( plt_type == DT_REL ) {
- Elf64_Rel *plt = pltrel;
- int count = plt_size / sizeof(Elf64_Rel);
- DEBUGS("plt rel count = %i", count);
- for( i = 0; i < count; i ++ )
- {
- uint64_t *ptr = (void *)( plt[i].r_offset + baseDiff );
- _Elf64DoReloc( plt[i].r_info, ptr, *ptr);
- }
- }
- else {
- Elf64_Rela *plt = pltrel;
- int count = plt_size / sizeof(Elf64_Rela);
- DEBUGS("plt rela count = %i", count);
- for( i = 0; i < count; i ++ )
- {
- _Elf64DoReloc( plt[i].r_info, (void *)(plt[i].r_offset + baseDiff), plt[i].r_addend);
- }
- }
+ case ELFCLASS32:
+ return Elf32GetSymbol(Base, Name, ret);
+#ifdef SUPPORT_ELF64
+ case ELFCLASS64:
+ return Elf64GetSymbol(Base, Name, ret);
+#endif
+ default:
+ SysDebug("ld-acess - ElfRelocate: Unknown file class %i", hdr->e_ident[4]);
+ return 0;
}
-
- DEBUGS("Elf64Relocate: Relocations done, return %p", (void *)(hdr->e_entry + baseDiff));
- return (void *)(hdr->e_entry + baseDiff);
}
void *Elf32Relocate(void *Base, char **envp, const char *Filename)
Elf32_Dyn *dynamicTab = NULL; // Dynamic Table Pointer
char *dynstrtab = NULL; // .dynamic String Table
Elf32_Sym *dynsymtab;
+ void (*do_relocate)(uint32_t t_info, uint32_t *ptr, Elf32_Addr addend, int Type, const char *Sym);
DEBUGS("ElfRelocate: (Base=0x%x)", Base);
DEBUGS(" elf_relocate: Beginning Relocation");
- void elf_doRelocate(uint32_t r_info, uint32_t *ptr, Elf32_Addr addend, Elf32_Sym *symtab)
+ void elf_doRelocate_386(uint32_t r_info, uint32_t *ptr, Elf32_Addr addend, int type, const char *Sym)
{
- 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 );
+ val = (intptr_t) GetSymbol( Sym );
DEBUGS(" elf_doRelocate: R_386_32 *0x%x += 0x%x('%s')",
- ptr, val, symname);
+ ptr, val, Sym);
*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: '%s'", Sym);
+ val = (intptr_t) GetSymbol( Sym );
DEBUGS(" elf_doRelocate: R_386_PC32 *0x%x = 0x%x + 0x%x - 0x%x",
ptr, *ptr, val, (intptr_t)ptr );
*ptr = val + addend - (intptr_t)ptr;
// 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'", Sym);
+ val = (intptr_t) GetSymbol( Sym );
DEBUGS(" elf_doRelocate: %s *0x%x = 0x%x", csaR_NAMES[type], ptr, val);
*ptr = val;
break;
break;
default:
- DEBUGS(" elf_doRelocate: Rel 0x%x: 0x%x,%s", ptr, sym, csaR_NAMES[type]);
+ SysDebug("elf_doRelocate_386: Unknown relocation %i", type);
+ break;
+ }
+ }
+
+ void elf_doRelocate_arm(uint32_t r_info, uint32_t *ptr, Elf32_Addr addend, int type, const char *Sym)
+ {
+ uint32_t val;
+ switch(type)
+ {
+ // (S + A) | T
+ case R_ARM_GLOB_DAT:
+ case R_ARM_JUMP_SLOT:
+ val = (intptr_t)GetSymbol(Sym);
+ *ptr = val + addend;
+ break;
+ default:
+ SysDebug("elf_doRelocate_arm: Unknown Relocation, %i", type);
break;
}
}
+
+ void _doRelocate(uint32_t r_info, uint32_t *ptr, Elf32_Addr addend)
+ {
+ int type = ELF32_R_TYPE(r_info);
+ int sym = ELF32_R_SYM(r_info);
+ const char *symname = dynstrtab + dynsymtab[sym].nameOfs;
+ do_relocate(r_info, ptr, addend, type, symname);
+ }
+
+ switch(hdr->machine)
+ {
+ case EM_386:
+ do_relocate = elf_doRelocate_386;
+ break;
+ case EM_ARM:
+ do_relocate = elf_doRelocate_arm;
+ break;
+ default:
+ SysDebug("Elf32Relocate: Unknown machine type %i", hdr->machine);
+ break;
+ }
// Parse Relocation Entries
if(rel && relSz)
{
//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);
+ _doRelocate(rel[i].r_info, ptr, *ptr);
}
}
// Parse Relocation Entries
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);
+ _doRelocate(rel[i].r_info, ptr, rela[i].r_addend);
}
}
for(i=0;i<j;i++)
{
ptr = (void*)(iBaseDiff + pltRel[i].r_offset);
- elf_doRelocate(pltRel[i].r_info, ptr, *ptr, dynsymtab);
+ _doRelocate(pltRel[i].r_info, ptr, *ptr);
}
}
else
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);
+ _doRelocate(pltRela[i].r_info, ptr, pltRela[i].r_addend);
}
}
}
return (void*)hdr->entrypoint + iBaseDiff;
}
-
-/**
- * \fn int ElfGetSymbol(Uint Base, const char *name, void **ret)
- */
-int ElfGetSymbol(void *Base, const char *Name, void **ret)
+int Elf32GetSymbol(void *Base, const char *Name, void **ret)
{
Elf32_Ehdr *hdr = Base;
-
- switch(hdr->e_ident[4])
- {
- case ELFCLASS32:
- return Elf32GetSymbol(Base, Name, ret);
- case ELFCLASS64:
- return Elf64GetSymbol(Base, Name, ret);
- default:
- SysDebug("ld-acess - ElfRelocate: Unknown file class %i", hdr->e_ident[4]);
- return 0;
- }
-}
-
-int Elf64GetSymbol(void *Base, const char *Name, void **Ret)
-{
- Elf64_Ehdr *hdr = Base;
- Elf64_Sym *symtab;
+ Elf32_Sym *symtab;
int nbuckets = 0;
int iSymCount = 0;
int i;
- Elf64_Word *pBuckets;
- Elf64_Word *pChains;
+ Uint32 *pBuckets;
+ Uint32 *pChains;
uint32_t iNameHash;
const char *dynstrtab;
uintptr_t iBaseDiff = -1;
+ Elf32_Phdr *phtab;
+ Elf32_Dyn *dynTab = NULL;
-// DEBUGS("sizeof(uint32_t) = %i, sizeof(Elf64_Word) = %i", sizeof(uint32_t), sizeof(Elf64_Word));
-
- dynstrtab = NULL;
- pBuckets = NULL;
- symtab = NULL;
-
- // Catch the current executable
- if( !pBuckets )
+ // Locate the tables
+ phtab = (void*)( Base + hdr->phoff );
+ for( i = 0; i < hdr->phentcount; i ++ )
{
- Elf64_Phdr *phtab;
- Elf64_Dyn *dynTab = NULL;
- int j;
-
- // Locate the tables
- phtab = (void*)( Base + hdr->e_phoff );
- for( i = 0; i < hdr->e_phnum; i ++ )
- {
- if(phtab[i].p_type == PT_LOAD && iBaseDiff > phtab[i].p_vaddr)
- iBaseDiff = phtab[i].p_vaddr;
- if( phtab[i].p_type == PT_DYNAMIC ) {
- dynTab = (void*)(intptr_t)phtab[i].p_vaddr;
- }
- }
- if( !dynTab ) {
- SysDebug("ERROR - Unable to find DYNAMIC segment in %p", Base);
- return 0;
+ 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;
}
- 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++)
+ }
+ if( !dynTab ) {
+ SysDebug("ERROR - Unable to find DYNAMIC segment in %p", Base);
+ return 0;
+ }
+ iBaseDiff = (intptr_t)Base - iBaseDiff; // Make iBaseDiff actually the diff
+ dynTab = (void*)( (intptr_t)dynTab + iBaseDiff );
+ for( i = 0; dynTab[i].d_tag != DT_NULL; i++)
+ {
+ switch(dynTab[i].d_tag)
{
- switch(dynTab[j].d_tag)
- {
- // --- Symbol Table ---
- case DT_SYMTAB:
- symtab = (void*)(intptr_t) dynTab[j].d_un.d_val; // Rebased in Relocate
- break;
- case DT_STRTAB:
- dynstrtab = (void*)(intptr_t) dynTab[j].d_un.d_val;
- break;
- // --- Hash Table --
- case DT_HASH:
- pBuckets = (void*)(intptr_t) dynTab[j].d_un.d_val;
- break;
- }
+ // --- Symbol Table ---
+ case DT_SYMTAB:
+ symtab = (void*)(intptr_t) dynTab[i].d_val; // Rebased in Relocate
+ break;
+ case DT_STRTAB:
+ dynstrtab = (void*)(intptr_t) dynTab[i].d_val;
+ break;
+ // --- Hash Table --
+ case DT_HASH:
+ pBuckets = (void*)(intptr_t) dynTab[i].d_val;
+ break;
}
}
-// DEBUGS("pBuckets = %p", pBuckets);
-
+
nbuckets = pBuckets[0];
iSymCount = pBuckets[1];
pBuckets = &pBuckets[2];
-// DEBUGS("nbuckets = %i", nbuckets);
pChains = &pBuckets[ nbuckets ];
// Get hash
// Walk Chain
i = pBuckets[ iNameHash ];
-// DEBUGS("dynstrtab = %p", dynstrtab);
-// DEBUGS("symtab = %p, i = %i", symtab, 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;
- DEBUGS("%s = %p", Name, *Ret);
+ if(symtab[i].shndx != SHN_UNDEF && strcmp(dynstrtab + symtab[i].nameOfs, Name) == 0) {
+ *ret = (void*) (intptr_t) symtab[ i ].value + iBaseDiff;
return 1;
}
while(pChains[i] != STN_UNDEF)
{
i = pChains[i];
-// DEBUGS("chains i = %i", 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;
- DEBUGS("%s = %p", Name, *Ret);
+ if(symtab[i].shndx != SHN_UNDEF && strcmp(dynstrtab + symtab[ i ].nameOfs, Name) == 0) {
+ *ret = (void*)(intptr_t)symtab[ i ].value + iBaseDiff;
return 1;
}
}
-// DEBUGS("Elf64GetSymbol: RETURN 0, Symbol '%s' not found", Name);
return 0;
}
-int Elf32GetSymbol(void *Base, const char *Name, void **ret)
+#ifdef SUPPORT_ELF64
+void *Elf64Relocate(void *Base, char **envp, const char *Filename)
{
- Elf32_Ehdr *hdr = Base;
- Elf32_Sym *symtab;
+ int i;
+ Elf64_Ehdr *hdr = Base;
+ Elf64_Phdr *phtab;
+ Elf64_Dyn *dyntab;
+ Elf64_Addr compiledBase = -1, baseDiff;
+ Elf64_Sym *symtab = NULL;
+ char *strtab = NULL;
+ Elf64_Word *hashtab = NULL;
+ Elf64_Rel *rel = NULL;
+ int rel_count = 0;
+ Elf64_Rela *rela = NULL;
+ int rela_count = 0;
+ void *pltrel = NULL;
+ int plt_size = 0, plt_type = 0;
+
+ DEBUGS("Elf64Relocate: hdr = {");
+ DEBUGS("Elf64Relocate: e_ident = '%.16s'", hdr->e_ident);
+ DEBUGS("Elf64Relocate: e_type = 0x%x", hdr->e_type);
+ DEBUGS("Elf64Relocate: e_machine = 0x%x", hdr->e_machine);
+ DEBUGS("Elf64Relocate: e_version = 0x%x", hdr->e_version);
+ DEBUGS("Elf64Relocate: e_entry = %p", hdr->e_entry);
+ DEBUGS("Elf64Relocate: e_phoff = 0x%llx", hdr->e_phoff);
+ DEBUGS("Elf64Relocate: e_shoff = 0x%llx", hdr->e_shoff);
+ DEBUGS("Elf64Relocate: e_flags = 0x%x", hdr->e_flags);
+ DEBUGS("Elf64Relocate: e_ehsize = 0x%x", hdr->e_ehsize);
+ DEBUGS("Elf64Relocate: e_phentsize = 0x%x", hdr->e_phentsize);
+ DEBUGS("Elf64Relocate: e_phnum = %i", hdr->e_phnum);
+
+ // Scan for the dynamic table (and find the compiled base)
+ phtab = Base + hdr->e_phoff;
+ for( i = 0; i < hdr->e_phnum; i ++ )
+ {
+ if(phtab[i].p_type == PT_DYNAMIC)
+ dyntab = (void *)(intptr_t)phtab[i].p_vaddr;
+ if(phtab[i].p_type == PT_LOAD && compiledBase > phtab[i].p_vaddr)
+ compiledBase = phtab[i].p_vaddr;
+ }
+
+ baseDiff = (Elf64_Addr)Base - compiledBase;
+
+ DEBUGS("baseDiff = %p", baseDiff);
+
+ if(dyntab == NULL) {
+ SysDebug(" Elf64Relocate: No PT_DYNAMIC segment in image %p, returning", Base);
+ return (void *)(hdr->e_entry + baseDiff);
+ }
+
+ dyntab = (void *)((Elf64_Addr)dyntab + baseDiff);
+
+ // Parse the dynamic table (first pass)
+ // - Search for String, Symbol and Hash tables
+ for(i = 0; dyntab[i].d_tag != DT_NULL; i ++)
+ {
+ switch(dyntab[i].d_tag)
+ {
+ case DT_SYMTAB:
+ dyntab[i].d_un.d_ptr += baseDiff;
+ symtab = (void *)dyntab[i].d_un.d_ptr;
+ break;
+ case DT_STRTAB:
+ dyntab[i].d_un.d_ptr += baseDiff;
+ strtab = (void *)dyntab[i].d_un.d_ptr;
+ break;
+ case DT_HASH:
+ dyntab[i].d_un.d_ptr += baseDiff;
+ hashtab = (void *)dyntab[i].d_un.d_ptr;
+ break;
+ }
+ }
+
+ if( !symtab || !strtab || !hashtab ) {
+ SysDebug("ld-acess - Elf64Relocate: Missing Symbol, string or hash table");
+ return NULL;
+ }
+
+ // Ready for symbol use
+ AddLoaded( Filename, Base );
+
+ // Second pass on dynamic table
+ for(i = 0; dyntab[i].d_tag != DT_NULL; i ++)
+ {
+ DEBUGS("dyntab[%i].d_tag = %i", i, dyntab[i].d_tag);
+ switch(dyntab[i].d_tag)
+ {
+ case DT_SONAME: break;
+
+ case DT_NEEDED: {
+ char *libPath = strtab + dyntab[i].d_un.d_val;
+ DEBUGS("Elf64Relocate: libPath = '%s'", libPath);
+ if(LoadLibrary(libPath, NULL, envp) == 0) {
+ SysDebug("ld-acess - Elf64Relocate: Unable to load '%s'", libPath);
+ return NULL;
+ }
+ } break;
+
+ // Relocation entries
+ case DT_REL:
+ dyntab[i].d_un.d_ptr += baseDiff;
+ rel = (void *)dyntab[i].d_un.d_ptr;
+ break;
+ case DT_RELSZ:
+ rel_count = dyntab[i].d_un.d_val / sizeof(Elf64_Rel);
+ break;
+ case DT_RELENT:
+ if( dyntab[i].d_un.d_val != sizeof(Elf64_Rel) ) {
+ SysDebug("ld-acess - Elf64Relocate: DT_RELENT(%i) != sizeof(Elf64_Rel)(%i)",
+ dyntab[i].d_un.d_val, sizeof(Elf64_Rel));
+ return NULL;
+ }
+ break;
+ case DT_RELA:
+ dyntab[i].d_un.d_ptr += baseDiff;
+ rela = (void *)dyntab[i].d_un.d_ptr;
+ break;
+ case DT_RELASZ:
+ rela_count = dyntab[i].d_un.d_val / sizeof(Elf64_Rela);
+ break;
+ case DT_RELAENT:
+ if( dyntab[i].d_un.d_val != sizeof(Elf64_Rela) ) {
+ SysDebug("ld-acess - Elf64Relocate: DT_RELAENT(%i) != sizeof(Elf64_Rela)(%i)",
+ dyntab[i].d_un.d_val, sizeof(Elf64_Rela));
+ return NULL;
+ }
+ break;
+ case DT_JMPREL:
+ dyntab[i].d_un.d_ptr += baseDiff;
+ pltrel = (void *)dyntab[i].d_un.d_ptr;
+ break;
+ case DT_PLTREL:
+ plt_type = dyntab[i].d_un.d_val;
+ break;
+ case DT_PLTRELSZ:
+ plt_size = dyntab[i].d_un.d_val;
+ break;
+ }
+ }
+
+ // Relocation function
+ void _Elf64DoReloc(Elf64_Xword r_info, void *ptr, Elf64_Sxword addend)
+ {
+ int sym = ELF64_R_SYM(r_info);
+ int type = ELF64_R_TYPE(r_info);
+ const char *symname = strtab + symtab[sym].st_name;
+ switch( type )
+ {
+ case R_X86_64_NONE:
+ break;
+ case R_X86_64_64:
+ *(uint64_t*)ptr = (uint64_t)GetSymbol(symname) + addend;
+ break;
+ case R_X86_64_COPY:
+ break;
+ case R_X86_64_GLOB_DAT:
+ *(uint64_t*)ptr = (uint64_t)GetSymbol(symname);
+ break;
+ case R_X86_64_JUMP_SLOT:
+ *(uint64_t*)ptr = (uint64_t)GetSymbol(symname);
+ break;
+ default:
+ SysDebug("ld-acess - _Elf64DoReloc: Unknown relocation type %i", type);
+ break;
+ }
+ }
+
+ if( rel )
+ {
+ DEBUGS("rel_count = %i", rel_count);
+ for( i = 0; i < rel_count; i ++ )
+ {
+ uint64_t *ptr = (void *)( rel[i].r_offset + baseDiff );
+ _Elf64DoReloc( rel[i].r_info, ptr, *ptr);
+ }
+ }
+
+ if( rela )
+ {
+ DEBUGS("rela_count = %i", rela_count);
+ for( i = 0; i < rela_count; i ++ )
+ {
+ _Elf64DoReloc( rela[i].r_info, (void *)( rela[i].r_offset + baseDiff ), rela[i].r_addend );
+ }
+ }
+
+ if( pltrel && plt_type )
+ {
+ if( plt_type == DT_REL ) {
+ Elf64_Rel *plt = pltrel;
+ int count = plt_size / sizeof(Elf64_Rel);
+ DEBUGS("plt rel count = %i", count);
+ for( i = 0; i < count; i ++ )
+ {
+ uint64_t *ptr = (void *)( plt[i].r_offset + baseDiff );
+ _Elf64DoReloc( plt[i].r_info, ptr, *ptr);
+ }
+ }
+ else {
+ Elf64_Rela *plt = pltrel;
+ int count = plt_size / sizeof(Elf64_Rela);
+ DEBUGS("plt rela count = %i", count);
+ for( i = 0; i < count; i ++ )
+ {
+ _Elf64DoReloc( plt[i].r_info, (void *)(plt[i].r_offset + baseDiff), plt[i].r_addend);
+ }
+ }
+ }
+
+ DEBUGS("Elf64Relocate: Relocations done, return %p", (void *)(hdr->e_entry + baseDiff));
+ return (void *)(hdr->e_entry + baseDiff);
+}
+
+int Elf64GetSymbol(void *Base, const char *Name, void **Ret)
+{
+ Elf64_Ehdr *hdr = Base;
+ Elf64_Sym *symtab;
int nbuckets = 0;
int iSymCount = 0;
int i;
- Uint32 *pBuckets;
- Uint32 *pChains;
+ Elf64_Word *pBuckets;
+ Elf64_Word *pChains;
uint32_t iNameHash;
const char *dynstrtab;
uintptr_t iBaseDiff = -1;
- //DEBUGS("ElfGetSymbol: (Base=0x%x, Name='%s')", Base, Name);
dynstrtab = NULL;
pBuckets = NULL;
symtab = NULL;
// Catch the current executable
if( !pBuckets )
{
- Elf32_Phdr *phtab;
- Elf32_Dyn *dynTab = NULL;
+ Elf64_Phdr *phtab;
+ Elf64_Dyn *dynTab = NULL;
int j;
// Locate the tables
- phtab = (void*)( Base + hdr->phoff );
- for( i = 0; i < hdr->phentcount; i ++ )
+ phtab = (void*)( Base + hdr->e_phoff );
+ for( i = 0; i < hdr->e_phnum; 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(phtab[i].p_type == PT_LOAD && iBaseDiff > phtab[i].p_vaddr)
+ iBaseDiff = phtab[i].p_vaddr;
+ if( phtab[i].p_type == PT_DYNAMIC ) {
+ dynTab = (void*)(intptr_t)phtab[i].p_vaddr;
}
}
if( !dynTab ) {
{
// --- Symbol Table ---
case DT_SYMTAB:
- symtab = (void*)(intptr_t) dynTab[j].d_val; // Rebased in Relocate
+ symtab = (void*)(intptr_t) dynTab[j].d_un.d_val; // Rebased in Relocate
break;
case DT_STRTAB:
- dynstrtab = (void*)(intptr_t) dynTab[j].d_val;
+ dynstrtab = (void*)(intptr_t) dynTab[j].d_un.d_val;
break;
// --- Hash Table --
case DT_HASH:
- pBuckets = (void*)(intptr_t) dynTab[j].d_val;
+ pBuckets = (void*)(intptr_t) dynTab[j].d_un.d_val;
break;
}
}
-
- #if 0
- hdr->misc.HashTable = pBuckets;
- hdr->misc.SymTable = symtab;
- hdr->misc.StrTab = dynstrtab;
- #endif
}
nbuckets = pBuckets[0];
// Get hash
iNameHash = ElfHashString(Name);
iNameHash %= nbuckets;
- //DEBUGS(" ElfGetSymbol: iNameHash = 0x%x", iNameHash);
// Walk Chain
i = pBuckets[ iNameHash ];
- //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;
+ if(symtab[i].st_shndx != SHN_UNDEF && strcmp(dynstrtab + symtab[i].st_name, Name) == 0) {
+ *Ret = (void*) (intptr_t) symtab[i].st_value + iBaseDiff;
+ DEBUGS("%s = %p", Name, *Ret);
return 1;
}
- //DEBUGS(" ElfGetSymbol: Hash of first = 0x%x", ElfHashString( symtab[i].name ) % nbuckets);
while(pChains[i] != STN_UNDEF)
{
- //DEBUGS(" pChains[%i] = %i", i, pChains[i]);
i = pChains[i];
- //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;
+ if(symtab[i].st_shndx != SHN_UNDEF && strcmp(dynstrtab + symtab[i].st_name, Name) == 0) {
+ *Ret = (void*)(intptr_t)symtab[i].st_value + iBaseDiff;
+ DEBUGS("%s = %p", Name, *Ret);
return 1;
}
}
- //DEBUGS("ElfGetSymbol: RETURN 0, Symbol '%s' not found", Name);
return 0;
}
+#endif
+
Uint32 ElfHashString(const char *name)
{
return h;
}
-#if 0
-unsigned long elf_hash(const unsigned char *name)
-{
- unsigned long h = 0, g;
- while (*name)
- {
- h = (h << 4) + *name++;
- if (g = h & 0xf0000000)
- h ^= g >> 24;
- h &= ~g;
- }
- return h;
-}
-#endif
git.ucc.asn.au / tpg / acess2.git / commitdiff
UCC git Repository :: git.ucc.asn.au