1 /*
2 * Copyright (C) 2011 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #define LOG_TAG "Corkscrew"
18 //#define LOG_NDEBUG 0
19
20 #include "../ptrace-arch.h"
21
22 #include <stddef.h>
23 #include <elf.h>
24 #include <cutils/log.h>
25
load_eh_frame_hdr(pid_t pid,map_info_t * mi,uintptr_t * eh_frame_hdr)26 static void load_eh_frame_hdr(pid_t pid, map_info_t* mi, uintptr_t *eh_frame_hdr) {
27 uint32_t elf_phoff;
28 uint32_t elf_phentsize_ehsize;
29 uint32_t elf_shentsize_phnum;
30 if (try_get_word_ptrace(pid, mi->start + offsetof(Elf32_Ehdr, e_phoff), &elf_phoff)
31 && try_get_word_ptrace(pid, mi->start + offsetof(Elf32_Ehdr, e_ehsize),
32 &elf_phentsize_ehsize)
33 && try_get_word_ptrace(pid, mi->start + offsetof(Elf32_Ehdr, e_phnum),
34 &elf_shentsize_phnum)) {
35 uint32_t elf_phentsize = elf_phentsize_ehsize >> 16;
36 uint32_t elf_phnum = elf_shentsize_phnum & 0xffff;
37 for (uint32_t i = 0; i < elf_phnum; i++) {
38 uintptr_t elf_phdr = mi->start + elf_phoff + i * elf_phentsize;
39 uint32_t elf_phdr_type;
40 if (!try_get_word_ptrace(pid, elf_phdr + offsetof(Elf32_Phdr, p_type), &elf_phdr_type)) {
41 break;
42 }
43 if (elf_phdr_type == PT_GNU_EH_FRAME) {
44 uint32_t elf_phdr_offset;
45 if (!try_get_word_ptrace(pid, elf_phdr + offsetof(Elf32_Phdr, p_offset),
46 &elf_phdr_offset)) {
47 break;
48 }
49 *eh_frame_hdr = mi->start + elf_phdr_offset;
50 ALOGV("Parsed .eh_frame_hdr info for %s: start=0x%08x", mi->name, *eh_frame_hdr);
51 return;
52 }
53 }
54 }
55 *eh_frame_hdr = 0;
56 }
57
load_ptrace_map_info_data_arch(pid_t pid,map_info_t * mi,map_info_data_t * data)58 void load_ptrace_map_info_data_arch(pid_t pid, map_info_t* mi, map_info_data_t* data) {
59 load_eh_frame_hdr(pid, mi, &data->eh_frame_hdr);
60 }
61
free_ptrace_map_info_data_arch(map_info_t * mi,map_info_data_t * data)62 void free_ptrace_map_info_data_arch(map_info_t* mi __attribute__((unused)),
63 map_info_data_t* data __attribute__((unused))) {
64 }
65