ptrace-arm.c revision f0c5872637a63e28e3cd314cfc915c07f76df9c6
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 <sys/exec_elf.h> 23#include <cutils/log.h> 24 25#ifndef PT_ARM_EXIDX 26#define PT_ARM_EXIDX 0x70000001 27#endif 28 29static void load_exidx_header(pid_t pid, map_info_t* mi, 30 uintptr_t* out_exidx_start, size_t* out_exidx_size) { 31 uint32_t elf_phoff; 32 uint32_t elf_phentsize_phnum; 33 if (try_get_word_ptrace(pid, mi->start + offsetof(Elf32_Ehdr, e_phoff), &elf_phoff) 34 && try_get_word_ptrace(pid, mi->start + offsetof(Elf32_Ehdr, e_phnum), 35 &elf_phentsize_phnum)) { 36 uint32_t elf_phentsize = elf_phentsize_phnum >> 16; 37 uint32_t elf_phnum = elf_phentsize_phnum & 0xffff; 38 for (uint32_t i = 0; i < elf_phnum; i++) { 39 uintptr_t elf_phdr = mi->start + elf_phoff + i * elf_phentsize; 40 uint32_t elf_phdr_type; 41 if (!try_get_word_ptrace(pid, elf_phdr + offsetof(Elf32_Phdr, p_type), &elf_phdr_type)) { 42 break; 43 } 44 if (elf_phdr_type == PT_ARM_EXIDX) { 45 uint32_t elf_phdr_offset; 46 uint32_t elf_phdr_filesz; 47 if (!try_get_word_ptrace(pid, elf_phdr + offsetof(Elf32_Phdr, p_offset), 48 &elf_phdr_offset) 49 || !try_get_word_ptrace(pid, elf_phdr + offsetof(Elf32_Phdr, p_filesz), 50 &elf_phdr_filesz)) { 51 break; 52 } 53 *out_exidx_start = mi->start + elf_phdr_offset; 54 *out_exidx_size = elf_phdr_filesz / 8; 55 ALOGV("Parsed EXIDX header info for %s: start=0x%08x, size=%d", mi->name, 56 *out_exidx_start, *out_exidx_size); 57 return; 58 } 59 } 60 } 61 *out_exidx_start = 0; 62 *out_exidx_size = 0; 63} 64 65void load_ptrace_map_info_data_arch(pid_t pid, map_info_t* mi, map_info_data_t* data) { 66 load_exidx_header(pid, mi, &data->exidx_start, &data->exidx_size); 67} 68 69void free_ptrace_map_info_data_arch(map_info_t* mi, map_info_data_t* data) { 70} 71