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/*
* Copyright (C) 2021 Ant Group. All rights reserved.
* SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
*/
#include <stdio.h>
#include <assert.h>
#include <fcntl.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <stdbool.h>
#include "elf.h"
#include "aot_runtime.h"
#include "bh_log.h"
#include "elf_parser.h"
bool
is_ELF(void *buf)
{
Elf32_Ehdr *eh = (Elf32_Ehdr *)buf;
if (!strncmp((char *)eh->e_ident, "\177ELF", 4)) {
LOG_VERBOSE("the buffer is ELF entry!");
return true;
}
LOG_VERBOSE("the buffer is not ELF entry!");
return false;
}
static bool
is64Bit(Elf32_Ehdr *eh)
{
if (eh->e_ident[EI_CLASS] == ELFCLASS64)
return true;
else
return false;
}
static bool
is32Bit(Elf32_Ehdr *eh)
{
if (eh->e_ident[EI_CLASS] == ELFCLASS32)
return true;
else
return false;
}
bool
is_ELF64(void *buf)
{
Elf64_Ehdr *eh = (Elf64_Ehdr *)buf;
if (!strncmp((char *)eh->e_ident, "\177ELF", 4)) {
LOG_VERBOSE("the buffer is ELF entry!");
return true;
}
LOG_VERBOSE("the buffer is not ELF entry!");
return false;
}
static void
read_section_header_table(Elf32_Ehdr *eh, Elf32_Shdr *sh_table[])
{
uint32_t i;
char *buf = (char *)eh;
buf += eh->e_shoff;
LOG_VERBOSE("str index = %d count=%d", eh->e_shstrndx, eh->e_shnum);
for (i = 0; i < eh->e_shnum; i++) {
sh_table[i] = (Elf32_Shdr *)buf;
buf += eh->e_shentsize;
}
}
static void
read_section_header_table64(Elf64_Ehdr *eh, Elf64_Shdr *sh_table[])
{
uint32_t i;
char *buf = (char *)eh;
buf += eh->e_shoff;
for (i = 0; i < eh->e_shnum; i++) {
sh_table[i] = (Elf64_Shdr *)buf;
buf += eh->e_shentsize;
}
}
static char *
get_section(Elf32_Ehdr *eh, Elf32_Shdr *section_header)
{
char *buf = (char *)eh;
return buf + section_header->sh_offset;
}
static char *
get_section64(Elf64_Ehdr *eh, Elf64_Shdr *section_header)
{
char *buf = (char *)eh;
return buf + section_header->sh_offset;
}
bool
get_text_section(void *buf, uint64_t *offset, uint64_t *size)
{
bool ret = false;
uint32 i;
char *sh_str;
if (is64Bit(buf)) {
Elf64_Ehdr *eh = (Elf64_Ehdr *)buf;
Elf64_Shdr **sh_table =
wasm_runtime_malloc(eh->e_shnum * sizeof(Elf64_Shdr *));
if (sh_table) {
read_section_header_table64(eh, sh_table);
sh_str = get_section64(eh, sh_table[eh->e_shstrndx]);
for (i = 0; i < eh->e_shnum; i++) {
if (!strcmp(sh_str + sh_table[i]->sh_name, ".text")) {
*offset = sh_table[i]->sh_offset;
*size = sh_table[i]->sh_size;
sh_table[i]->sh_addr =
(Elf64_Addr)(uintptr_t)((char *)buf
+ sh_table[i]->sh_offset);
ret = true;
break;
}
}
wasm_runtime_free(sh_table);
}
}
else if (is32Bit(buf)) {
Elf32_Ehdr *eh = (Elf32_Ehdr *)buf;
Elf32_Shdr **sh_table =
wasm_runtime_malloc(eh->e_shnum * sizeof(Elf32_Shdr *));
if (sh_table) {
read_section_header_table(eh, sh_table);
sh_str = get_section(eh, sh_table[eh->e_shstrndx]);
for (i = 0; i < eh->e_shnum; i++) {
if (!strcmp(sh_str + sh_table[i]->sh_name, ".text")) {
*offset = sh_table[i]->sh_offset;
*size = sh_table[i]->sh_size;
sh_table[i]->sh_addr =
(Elf32_Addr)(uintptr_t)((char *)buf
+ sh_table[i]->sh_offset);
ret = true;
break;
}
}
wasm_runtime_free(sh_table);
}
}
return ret;
}
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