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 29 static 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_ehsize; 33 uint32_t elf_shentsize_phnum; 34 if (try_get_word_ptrace(pid, mi->start + offsetof(Elf32_Ehdr, e_phoff), &elf_phoff) 35 && try_get_word_ptrace(pid, mi->start + offsetof(Elf32_Ehdr, e_ehsize), 36 &elf_phentsize_ehsize) 37 && try_get_word_ptrace(pid, mi->start + offsetof(Elf32_Ehdr, e_phnum), 38 &elf_shentsize_phnum)) { 39 uint32_t elf_phentsize = elf_phentsize_ehsize >> 16; 40 uint32_t elf_phnum = elf_shentsize_phnum & 0xffff; 41 for (uint32_t i = 0; i < elf_phnum; i++) { 42 uintptr_t elf_phdr = mi->start + elf_phoff + i * elf_phentsize; 43 uint32_t elf_phdr_type; 44 if (!try_get_word_ptrace(pid, elf_phdr + offsetof(Elf32_Phdr, p_type), &elf_phdr_type)) { 45 break; 46 } 47 if (elf_phdr_type == PT_ARM_EXIDX) { 48 uint32_t elf_phdr_offset; 49 uint32_t elf_phdr_filesz; 50 if (!try_get_word_ptrace(pid, elf_phdr + offsetof(Elf32_Phdr, p_offset), 51 &elf_phdr_offset) 52 || !try_get_word_ptrace(pid, elf_phdr + offsetof(Elf32_Phdr, p_filesz), 53 &elf_phdr_filesz)) { 54 break; 55 } 56 *out_exidx_start = mi->start + elf_phdr_offset; 57 *out_exidx_size = elf_phdr_filesz / 8; 58 ALOGV("Parsed EXIDX header info for %s: start=0x%08x, size=%d", mi->name, 59 *out_exidx_start, *out_exidx_size); 60 return; 61 } 62 } 63 } 64 *out_exidx_start = 0; 65 *out_exidx_size = 0; 66 } 67 68 void load_ptrace_map_info_data_arch(pid_t pid, map_info_t* mi, map_info_data_t* data) { 69 load_exidx_header(pid, mi, &data->exidx_start, &data->exidx_size); 70 } 71 72 void free_ptrace_map_info_data_arch(map_info_t* mi, map_info_data_t* data) { 73 } 74
