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libelf.c
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include <elf.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include "wdb.h"
#include "libelf.h"
int mmap_elf_binary(struct wdb_symbol *sym)
{
struct stat f_stat;
int fd;
fd = open(sym->elf_path, O_RDONLY);
if (fd == -1) {
perror("open");
return -1;
}
if (stat(sym->elf_path, &f_stat) == -1) {
perror("stat");
goto out;
}
sym->mmap_fd = fd;
sym->mmap_size = f_stat.st_size;
sym->base_addr = mmap(NULL, sym->mmap_size, PROT_READ, MAP_PRIVATE, fd, 0);
if (sym->base_addr == MAP_FAILED) {
perror("mmap");
goto out_map;
}
sym->elf_header = (Elf64_Ehdr *)sym->base_addr;
sym->ph_header = (Elf64_Phdr *)(sym->base_addr + sym->elf_header->e_phoff);
sym->sh_header = (Elf64_Shdr *)(sym->base_addr + sym->elf_header->e_shoff);
sym->shstrtab_mem = (void *)(sym->base_addr +
sym->sh_header[sym->elf_header->e_shstrndx].sh_offset);
close(fd);
return 0;
out_map:
munmap(sym->base_addr, sym->mmap_size);
out:
close(fd);
return -1;
}
void unmap_elf_binary(struct wdb_symbol *sym)
{
munmap(sym->base_addr, sym->mmap_size);
close(sym->mmap_fd);
}
int check_elf_magic(Elf64_Ehdr *elf_header)
{
if (memcmp(elf_header->e_ident, ELFMAG, SELFMAG)) {
fprintf(stderr, "wrong elf magic.\n");
return -1;
}
if (elf_header->e_ident[EI_CLASS] != ELFCLASS64) {
fprintf(stderr, "not support 32bit elf format.\n");
return -1;
}
return 0;
}
int display_elf_header(Elf64_Ehdr *elf_header)
{
int i;
printf("%-16s\t", "magic:");
for (i = 0; i < EI_NIDENT; i++)
printf("%02x ", elf_header->e_ident[i]);
printf("\n");
switch (elf_header->e_ident[EI_CLASS]) {
case ELFCLASS32:
printf("%-16s\t32bit\n", "class:");
break;
case ELFCLASS64:
printf("%-16s\t64bit\n", "class:");
break;
default:
printf("wrong class type.\n");
return -1;
}
switch (elf_header->e_ident[EI_DATA]) {
case ELFDATA2LSB:
printf("%-16s\tTwo's complement, little-endian.\n", "data:");
break;
case ELFDATA2MSB:
printf("%-16s\tTwo's complement, big-endian.\n", "data:");
break;
default:
printf("wrong data type.\n");
return -1;
}
printf("%-16s\t%d\n", "version:", elf_header->e_ident[EI_VERSION]);
switch (elf_header->e_ident[EI_OSABI]) {
case ELFOSABI_LINUX:
printf("%-16s\tLinux ABI.\n", "osabi:");
break;
case ELFOSABI_SYSV:
printf("%-16s\tUNIX System V ABI.\n", "osabi:");
break;
case ELFOSABI_ARM:
printf("%-16s\tARM architecture ABI.\n", "osabi:");
break;
default:
printf("unkonw osabi.\n");
return -1;
}
switch (elf_header->e_type) {
case ET_REL:
printf("%-16s\trelocatable file.\n", "type:");
break;
case ET_EXEC:
printf("%-16s\texecutable file.\n", "type:");
break;
case ET_DYN:
printf("%-16s\tshared object.\n", "type:");
break;
case ET_CORE:
printf("%-16s\tcore file.\n", "type:");
break;
default:
printf("unkonw elf type.\n");
return -1;
}
switch (elf_header->e_machine) {
case EM_X86_64:
printf("%-16s\tAMD x86-64.\n", "machine:");
break;
case EM_ARM:
printf("%-16s\tAdvanced RISC Machines.\n", "machine:");
break;
default:
printf("unkonw elf machine type.\n");
return -1;
}
printf("%-16s\t%d\n", "version:", elf_header->e_version);
printf("%-16s\t0x%x (program entry address)\n", "entry:", elf_header->e_entry);
printf("%-16s\t0x%x (program header table offset)\n", "phoff:", elf_header->e_phoff);
printf("%-16s\t0x%x (section header table offset)\n", "shoff:", elf_header->e_shoff);
printf("%-16s\t%d (elf header size)\n", "ehsize:", elf_header->e_ehsize);
printf("%-16s\t%d (per program size)\n", "phentsize:", elf_header->e_phentsize);
printf("%-16s\t%d (program header num)\n", "phnum:", elf_header->e_phnum);
printf("%-16s\t%d (per section size)\n", "shentsize:", elf_header->e_shentsize);
printf("%-16s\t%d (section num)\n", "shnum:", elf_header->e_shnum);
printf("%-16s\t%d (section name string index)\n", "shstrndx:", elf_header->e_shstrndx);
return 0;
}
char *parse_ph_type(uint32_t type)
{
static char *desc_type;
switch (type) {
case PT_NULL:
desc_type = "NULL";
break;
case PT_LOAD:
desc_type = "LOAD";
break;
case PT_DYNAMIC:
desc_type = "DYNAMIC";
break;
case PT_INTERP:
desc_type = "INTERP";
break;
case PT_NOTE:
desc_type = "NOTE";
break;
case PT_SHLIB:
desc_type = "SHLIB";
break;
case PT_PHDR:
desc_type = "PHDR";
break;
case PT_TLS:
desc_type = "TLS";
break;
case PT_LOOS:
desc_type = "LOOS";
break;
case PT_HIOS:
desc_type = "HIOS";
break;
case PT_LOPROC:
desc_type = "LOPROC";
break;
case PT_HIPROC:
desc_type = "HIPROC";
break;
case PT_GNU_EH_FRAME:
desc_type = "GNU_EH_FRAME";
break;
case PT_GNU_STACK:
desc_type = "GNU_STACK";
break;
case PT_GNU_RELRO:
desc_type = "GNU_RELRO";
break;
default:
return NULL;
}
return desc_type;
}
static char *ph_flags[7] = {"X","W","WX","R","RX","RW","RWX"};
int display_program_headers(struct wdb_symbol *sym)
{
int i;
printf("%-16s%-16s %-16s %-16s\n\t\t%-16s %-16s %-8s%-8s\n\n",
"type", "offset", "vaddr", "paddr",
"filesz", "memsz", "flags", "align");
for (i = 0; i < sym->elf_header->e_phnum; i++) {
printf("%-16s0x%-16x0x%016x 0x%016x\n"
"\t\t0x%-16x0x%-16x %-8s0x%-8x\n",
parse_ph_type(sym->ph_header[i].p_type),
sym->ph_header[i].p_offset,
sym->ph_header[i].p_vaddr, sym->ph_header[i].p_paddr,
sym->ph_header[i].p_filesz, sym->ph_header[i].p_memsz,
ph_flags[sym->ph_header[i].p_flags - 1], sym->ph_header[i].p_align);
}
return 0;
}
uint64_t get_libc_base(pid_t pid)
{
FILE *fp;
char file[64], buf[256];
snprintf(file, sizeof(file) - 1, "/proc/%d/maps", pid);
fp = fopen(file, "r");
if (!fp) {
perror("fopen");
return 0;
}
while (fgets(buf, 256, fp) != NULL) {
uint64_t addr1, addr2, tmp2, tmp3;
char rwx[8], tmp1[16], lib[32];
sscanf(buf, "%lx-%lx %s %lx %s %lx %s\n",
&addr1, &addr2, rwx, &tmp2, tmp1, &tmp3, lib);
if (strstr(lib, "libc-") && rwx[2] == 'x') {
fclose(fp);
return addr1;
}
}
fclose(fp);
return 0;
}
char *string_name(void *mem, int offset)
{
if (!mem || offset < 0)
return NULL;
return (char *)(mem + offset);
}
char *section_name(void *mem, int offset)
{
return string_name(mem, offset);
}
char *symbol_name(void *mem, int offset)
{
return string_name(mem, offset);
}
int read_elf_section(struct wdb_symbol *sym)
{
int i;
for (i = 0; i < sym->elf_header->e_shnum; i++) {
if (sym->sh_header[i].sh_type == SHT_SYMTAB) {
sym->sym_table = &sym->sh_header[i];
continue;
}
if (sym->sh_header[i].sh_type == SHT_DYNSYM) {
sym->dsym_table = &sym->sh_header[i];
continue;
}
if (sym->sh_header[i].sh_type == SHT_DYNAMIC) {
sym->dyn_table = &sym->sh_header[i];
continue;
}
if (sym->sh_header[i].sh_type == SHT_REL) {
sym->rel_table[sym->rel_idx++] = &sym->sh_header[i];
continue;
}
if (sym->sh_header[i].sh_type == SHT_RELA) {
sym->rela_table[sym->rela_idx++] = &sym->sh_header[i];
continue;
}
if (!strcmp(section_name(sym->shstrtab_mem,
sym->sh_header[i].sh_name),
".plt")) {
sym->plt_table = &sym->sh_header[i];
continue;
}
if (!strcmp(section_name(sym->shstrtab_mem,
sym->sh_header[i].sh_name),
".strtab")) {
sym->strtab_mem =
(void *)(sym->base_addr + sym->sh_header[i].sh_offset);
continue;
}
if (!strcmp(section_name(sym->shstrtab_mem,
sym->sh_header[i].sh_name),
".dynstr")) {
sym->dynstr_mem =
(void *)(sym->base_addr + sym->sh_header[i].sh_offset);
continue;
}
}
return 0;
}
char *section_type(int type)
{
static char *type_desc;
switch (type) {
case SHT_NULL:
type_desc = "NULL";
break;
case SHT_PROGBITS:
type_desc = "PROGBITS";
break;
case SHT_SYMTAB:
type_desc = "SYMTAB";
break;
case SHT_STRTAB:
type_desc = "STRTAB";
break;
case SHT_RELA:
type_desc = "RELA";
break;
case SHT_HASH:
type_desc = "HASH";
break;
case SHT_DYNAMIC:
type_desc = "DYNAMIC";
break;
case SHT_NOTE:
type_desc = "NOTE";
break;
case SHT_NOBITS:
type_desc = "NOBITS";
break;
case SHT_REL:
type_desc = "REL";
break;
case SHT_SHLIB:
type_desc = "SHLIB";
break;
case SHT_DYNSYM:
type_desc = "DYNSYM";
break;
case SHT_NUM:
type_desc = "NUM";
break;
case SHT_LOPROC:
type_desc = "LOPROC";
break;
case SHT_HIPROC:
type_desc = "HIPROC";
break;
case SHT_LOUSER:
type_desc = "LOUSER";
break;
case SHT_HIUSER:
type_desc = "HIUSER";
break;
case SHT_GNU_HASH:
type_desc = "GNU_HASH";
break;
case SHT_INIT_ARRAY:
type_desc = "INIT_ARRAY";
break;
case SHT_FINI_ARRAY:
type_desc = "FINI_ARRAY";
break;
/*
case SHT_VERSYM:
type_desc = "VERSYM";
break;
case SHT_VERNEED:
type_desc = "VERNEED";
break;
*/
default:
type_desc = "UNKOWN";
break;
}
return type_desc;
}
int display_section_headers(struct wdb_symbol *sym)
{
int i;
printf("%-8s%-16s %-16s %-16s %-8s\n"
"\t%-16s %-16s %-4s %-4s %-4s %-4s\n\n",
"[NR]", "name", "type", "address", "offset",
"size", "entsize", "flags", "link", "info", "align");
for (i = 0; i < sym->elf_header->e_shnum; i++) {
printf("%-8d%-16s %-16s 0x%016x 0x%08x\n"
"\t0x%016x 0x%016x %-4d %-4d %-4d %-4d\n",
i, section_name(sym->shstrtab_mem, sym->sh_header[i].sh_name),
section_type(sym->sh_header[i].sh_type),
sym->sh_header[i].sh_addr, sym->sh_header[i].sh_offset,
sym->sh_header[i].sh_size, sym->sh_header[i].sh_entsize,
sym->sh_header[i].sh_flags, sym->sh_header[i].sh_link,
sym->sh_header[i].sh_info, sym->sh_header[i].sh_addralign);
}
return 0;
}
char *symbol_type(int value)
{
static char *type_desc;
switch (value) {
case STT_NOTYPE:
type_desc = "NOTYPE";
break;
case STT_OBJECT:
type_desc = "OBJECT";
break;
case STT_FUNC:
type_desc = "FUNC";
break;
case STT_SECTION:
type_desc = "SECTION";
break;
case STT_FILE:
type_desc = "FILE";
break;
case STT_COMMON:
type_desc = "COMMON";
break;
case STT_TLS:
type_desc = "TLS";
break;
default:
type_desc = "NULL";
}
return type_desc;
}
char *symbol_bind(int value)
{
static char *bind_desc;
switch (value) {
case STB_LOCAL:
bind_desc = "LOCAL";
break;
case STB_GLOBAL:
bind_desc = "GLOBAL";
break;
case STB_WEAK:
bind_desc = "WEAK";
break;
default:
bind_desc = "Unknown";
}
return bind_desc;
}
char *symbol_vis(int value)
{
static char *vis_desc;
switch (value) {
case STV_DEFAULT:
vis_desc = "DEFAULT";
break;
case STV_INTERNAL:
vis_desc = "INTERNAL";
break;
case STV_HIDDEN:
vis_desc = "INTERNAL";
break;
case STV_PROTECTED:
vis_desc = "PROTECTED";
break;
default:
vis_desc = "NULL";
}
return vis_desc;
}
int64_t resolve_symbol_addr(struct wdb_symbol *sym, Elf64_Shdr *section,
void *mem, char *name)
{
Elf64_Sym *sym_table;
int i;
sym_table = (Elf64_Sym *)(sym->base_addr + section->sh_offset);
for (i = 0; i < section->sh_size/sizeof(Elf64_Sym); i++) {
if (!strcmp(symbol_name(mem, sym_table[i].st_name), name))
return (int64_t)(sym_table[i].st_value);
}
return 0;
}
uint64_t fetch_symbol_addr(struct wdb_symbol *sym, char *name)
{
uint64_t value;
if (sym->strtab_mem) {
value = resolve_symbol_addr(sym, sym->sym_table,
sym->strtab_mem, name);
if (value != 0)
return value;
}
if (sym->dynstr_mem) {
value = resolve_symbol_addr(sym, sym->dsym_table,
sym->dynstr_mem, name);
if (value != 0)
return value;
}
return fetch_address_from_reloc(sym, name);
}
int32_t resolve_symbol_size(struct wdb_symbol *sym, Elf64_Shdr *section,
void *mem, uint64_t addr)
{
Elf64_Sym *sym_table;
int i;
sym_table = (Elf64_Sym *)(sym->base_addr + section->sh_offset);
for (i = 0; i < section->sh_size/sizeof(Elf64_Sym); i++) {
if ((uint64_t)(sym->libc_addr + sym_table[i].st_value) == addr) {
return sym_table[i].st_size;
}
}
return -1;
}
uint32_t fetch_symbol_size(struct wdb_symbol *sym, uint64_t addr)
{
int32_t value;
if (sym->strtab_mem) {
value = resolve_symbol_size(sym, sym->sym_table,
sym->strtab_mem, addr);
if (value != -1)
return value;
}
if (sym->dynstr_mem) {
value = resolve_symbol_size(sym, sym->dsym_table,
sym->dynstr_mem, addr);
if (value != -1)
return value;
}
return -1;
}
void __display_sym_table(struct wdb_symbol *sym, Elf64_Shdr *section, void *mem)
{
Elf64_Sym *sym_table;
int i;
printf("%-4s %-16s %-4s %-8s %-10s %-10s %-8s %-32s\n",
"num", "value", "size", "type", "bind", "vis", "ndx", "name");
sym_table = (Elf64_Sym *)(sym->base_addr + section->sh_offset);
for (i = 0; i < section->sh_size/sizeof(Elf64_Sym); i++) {
printf("%-4d 0x%016x %-4d %-8s %-10s %-10s %-8d %-32s\n",
i, sym_table[i].st_value,
sym_table[i].st_size,
symbol_type(ELF64_ST_TYPE(sym_table[i].st_info)),
symbol_bind(ELF64_ST_BIND(sym_table[i].st_info)),
symbol_vis(ELF64_ST_VISIBILITY(sym_table[i].st_other)),
sym_table[i].st_shndx,
symbol_name(mem, sym_table[i].st_name));
}
}
void display_sym_table(struct wdb_symbol *sym)
{
if (sym->dynstr_mem)
__display_sym_table(sym, sym->sym_table, sym->strtab_mem);
}
void display_dsym_table(struct wdb_symbol *sym)
{
if (sym->dynstr_mem)
__display_sym_table(sym, sym->dsym_table, sym->dynstr_mem);
}
char *rela_type(int value)
{
static char *type_desc;
switch (value) {
case R_X86_64_NONE:
type_desc = "R_X86_64_NONE";
break;
case R_X86_64_64:
type_desc = "R_X86_64_64";
break;
case R_X86_64_PC32:
type_desc = "R_X86_64_PC32";
break;
case R_X86_64_GOT32:
type_desc = "R_X86_64_GOT32";
break;
case R_X86_64_PLT32:
type_desc = "R_X86_64_PLT32";
break;
case R_X86_64_COPY:
type_desc = "R_X86_64_COPY";
break;
case R_X86_64_GLOB_DAT:
type_desc = "R_X86_64_GLOB_DAT";
break;
case R_X86_64_JUMP_SLOT:
type_desc = "R_X86_64_JUMP_SLOT";
break;
case R_X86_64_RELATIVE:
type_desc = "R_X86_64_RELATIVE";
break;
case R_X86_64_GOTPCREL:
type_desc = "R_X86_64_GOTPCREL";
break;
case R_X86_64_32:
type_desc = "R_X86_64_32";
break;
case R_X86_64_32S:
type_desc = "R_X86_64_32S";
break;
case R_X86_64_16:
type_desc = "R_X86_64_16";
break;
case R_X86_64_PC16:
type_desc = "R_X86_64_PC16";
break;
case R_X86_64_8:
type_desc = "R_X86_64_8";
break;
case R_X86_64_PC8:
type_desc = "R_X86_64_PC8";
break;
case R_X86_64_DTPMOD64:
type_desc = "R_X86_64_DTPMOD64";
break;
case R_X86_64_DTPOFF64:
type_desc = "R_X86_64_DTPOFF64";
break;
case R_X86_64_TLSGD:
type_desc = "R_X86_64_TLSGD";
break;
case R_X86_64_TLSLD:
type_desc = "R_X86_64_TLSLD";
break;
case R_X86_64_DTPOFF32:
type_desc = "R_X86_64_DTPOFF32";
break;
case R_X86_64_GOTTPOFF:
type_desc = "R_X86_64_GOTTPOFF";
break;
case R_X86_64_TPOFF32:
type_desc = "R_X86_64_TPOFF32";
break;
case R_X86_64_PC64:
type_desc = "R_X86_64_PC64";
break;
case R_X86_64_GOTOFF64:
type_desc = "R_X86_64_GOTOFF64";
break;
case R_X86_64_GOTPC32:
type_desc = "R_X86_64_GOTPC32";
break;
case R_X86_64_GOT64:
type_desc = "R_X86_64_GOT64";
break;
case R_X86_64_GOTPCREL64:
type_desc = "R_X86_64_GOTPCREL64";
break;
case R_X86_64_GOTPC64:
type_desc = "R_X86_64_GOTPC64";
break;
case R_X86_64_GOTPLT64:
type_desc = "R_X86_64_GOTPLT64";
break;
case R_X86_64_PLTOFF64:
type_desc = "R_X86_64_PLTOFF64";
break;
case R_X86_64_SIZE32:
type_desc = "R_X86_64_SIZE32";
break;
case R_X86_64_SIZE64:
type_desc = "R_X86_64_SIZE64";
break;
case R_X86_64_GOTPC32_TLSDESC:
type_desc = "R_X86_64_GOTPC32_TLSDESC";
break;
case R_X86_64_TLSDESC_CALL:
type_desc = "R_X86_64_TLSDESC_CALL";
break;
case R_X86_64_TLSDESC:
type_desc = "R_X86_64_TLSDESC";
break;
case R_X86_64_IRELATIVE:
type_desc = "R_X86_64_IRELATIVE";
break;
case R_X86_64_RELATIVE64:
type_desc = "R_X86_64_RELATIVE64";
break;
default:
type_desc = "Unknown";
}
return type_desc;
}
Elf64_Sym *get_rel_sym(struct wdb_symbol *sym, int idx)
{
Elf64_Sym *sym_table;
sym_table = (Elf64_Sym *)(sym->base_addr + sym->dsym_table->sh_offset);
return &sym_table[idx];
}
void __display_rel_table(struct wdb_symbol *sym, Elf64_Shdr *section, void *mem)
{
Elf64_Rel *rel_table;
int i;
printf("%-16s %-16s %-20s%-16s %-32s\n",
"offset", "info", "type","sym.value", "sym.name");
rel_table = (Elf64_Rel *)(sym->base_addr + section->sh_offset);
for (i = 0; i < section->sh_size/sizeof(Elf64_Rel); i++) {
Elf64_Sym *symbol;
symbol = get_rel_sym(sym, ELF64_R_SYM(rel_table[i].r_info));
if (!symbol)
continue;
printf("0x%016x 0x%016x %-20s0x%016x %s\n",
rel_table[i].r_offset,
rel_table[i].r_info,
rela_type(ELF64_R_TYPE(rel_table[i].r_info)),
symbol->st_value, symbol_name(mem, symbol->st_name));
}
}
void display_rel_table(struct wdb_symbol *sym)
{
int i;
for (i = 0; i < sym->rel_idx; i++) {
__display_rel_table(sym, sym->rel_table[i], sym->dynstr_mem);
printf("\n");
}
}
void __display_rela_table(struct wdb_symbol *sym, Elf64_Shdr *section, void *mem)
{
Elf64_Rela *rela_table;
int i;
printf("%-16s %-16s %-20s%-16s %-32s\n",
"offset", "info", "type","sym.value", "sym.name + addend");
rela_table = (Elf64_Rela *)(sym->base_addr + section->sh_offset);
for (i = 0; i < section->sh_size/sizeof(Elf64_Rela); i++) {
Elf64_Sym *symbol;
symbol = get_rel_sym(sym, ELF64_R_SYM(rela_table[i].r_info));
if (!symbol)
continue;
printf("0x%016x 0x%016x %-20s0x%016x %s + %d\n",
rela_table[i].r_offset,
rela_table[i].r_info,
rela_type(ELF64_R_TYPE(rela_table[i].r_info)),
symbol->st_value, symbol_name(mem, symbol->st_name),
rela_table[i].r_addend);
}
}
void display_rela_table(struct wdb_symbol *sym)
{
int i;
for (i = 0; i < sym->rela_idx; i++) {
__display_rela_table(sym, sym->rela_table[i], sym->dynstr_mem);
printf("\n");
}
}
uint64_t __fetch_address_from_rel(struct wdb_symbol *sym,
Elf64_Shdr *section,
void *mem,
char *name)
{
Elf64_Rel *rel_table;
int i;
rel_table = (Elf64_Rel *)(sym->base_addr + section->sh_offset);
for (i = 0; i < section->sh_size/sizeof(Elf64_Rel); i++) {
Elf64_Sym *symbol;
symbol = get_rel_sym(sym, ELF64_R_SYM(rel_table[i].r_info));
if (!symbol)
continue;
if (!strcmp(symbol_name(mem, symbol->st_name), name))
return sym->plt_table->sh_addr + (i + 1) * 0x10;
}
return 0;
}
uint64_t fetch_address_from_rel(struct wdb_symbol *sym, char *name)
{
uint64_t addr;
int i;
for (i = 0; i < sym->rel_idx; i++) {
addr = __fetch_address_from_rel(sym, sym->rel_table[i],
sym->dynstr_mem, name);
if (addr != 0)
return addr;
}
return 0;
}
uint64_t __fetch_address_from_rela(struct wdb_symbol *sym,
Elf64_Shdr *section,
void *mem,
char *name)
{
Elf64_Rela *rela_table;
int i;
rela_table = (Elf64_Rela *)(sym->base_addr + section->sh_offset);
for (i = 0; i < section->sh_size/sizeof(Elf64_Rela); i++) {
Elf64_Sym *symbol;
symbol = get_rel_sym(sym, ELF64_R_SYM(rela_table[i].r_info));
if (!symbol)
continue;
if (!strcmp(symbol_name(mem, symbol->st_name), name))
return sym->plt_table->sh_addr + (i + 1) * 0x10;
}
return 0;
}
uint64_t fetch_address_from_rela(struct wdb_symbol *sym, char *name)
{
uint64_t addr;
int i;
for (i = 0; i < sym->rela_idx; i++) {
addr = __fetch_address_from_rela(sym, sym->rela_table[i],
sym->dynstr_mem, name);
if (addr != 0)
return addr;
}
return 0;
}
uint64_t fetch_address_from_reloc(struct wdb_symbol *sym, char *name)
{
uint64_t addr;
addr = fetch_address_from_rel(sym, name);
if (addr != 0)
return addr;
return fetch_address_from_rela(sym, name);
}
char *dyn_needed_string(void *mem, uint64_t idx)
{
return symbol_name(mem, idx);
}
int read_dyn_tag(Elf64_Dyn *dyn, void *mem,
uint64_t *value, char *type,
char *string)
{
int rc = -1;
switch (dyn->d_tag) {
case DT_NULL:
break;
case DT_NEEDED:
strcpy(type, "NEEDED");
strcpy(string, dyn_needed_string(mem, dyn->d_un.d_val));
rc = 1;
break;
case DT_PLTRELSZ:
strcpy(type, "PLTRELSZ");
*value = dyn->d_un.d_val;
rc = 2;
break;
case DT_PLTGOT:
strcpy(type, "PLTGOT");
*value = dyn->d_un.d_val;
rc = 2;
break;
case DT_HASH:
strcpy(type, "HASH");
*value = dyn->d_un.d_val;
rc = 2;
break;
case DT_STRTAB:
strcpy(type, "STRTAB");
*value = dyn->d_un.d_val;
rc = 2;
break;
case DT_SYMTAB:
strcpy(type, "SYMTAB");
*value = dyn->d_un.d_val;
rc = 2;
break;
case DT_RELA:
strcpy(type, "RELA");
*value = dyn->d_un.d_val;
rc = 2;
break;
case DT_RELASZ:
strcpy(type, "RELASZ");
*value = dyn->d_un.d_val;
rc = 2;
break;
case DT_RELAENT:
strcpy(type, "RELAENT");
*value = dyn->d_un.d_val;
rc = 2;
break;
case DT_STRSZ:
strcpy(type, "STRSZ");
*value = dyn->d_un.d_val;
rc = 2;
break;
case DT_SYMENT:
strcpy(type, "SYMENT");
*value = dyn->d_un.d_val;
rc = 2;
break;
case DT_INIT:
strcpy(type, "INIT");
*value = dyn->d_un.d_val;
rc = 2;
break;
case DT_FINI: