diff options
Diffstat (limited to 'libcorkscrew/ptrace.c')
| -rw-r--r-- | libcorkscrew/ptrace.c | 152 |
1 files changed, 0 insertions, 152 deletions
diff --git a/libcorkscrew/ptrace.c b/libcorkscrew/ptrace.c deleted file mode 100644 index be58f7f..0000000 --- a/libcorkscrew/ptrace.c +++ /dev/null @@ -1,152 +0,0 @@ -/* - * Copyright (C) 2011 The Android Open Source Project - * - * Licensed under the Apache License, Version 2.0 (the "License"); - * you may not use this file except in compliance with the License. - * You may obtain a copy of the License at - * - * http://www.apache.org/licenses/LICENSE-2.0 - * - * Unless required by applicable law or agreed to in writing, software - * distributed under the License is distributed on an "AS IS" BASIS, - * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - * See the License for the specific language governing permissions and - * limitations under the License. - */ - -#define LOG_TAG "Corkscrew" -//#define LOG_NDEBUG 0 - -#include "ptrace-arch.h" -#include <corkscrew/ptrace.h> - -#include <errno.h> -#include <stdlib.h> -#include <sys/ptrace.h> -#include <cutils/log.h> - -static const uint32_t ELF_MAGIC = 0x464C457f; // "ELF\0177" - -#ifndef PAGE_SIZE -#define PAGE_SIZE 4096 -#endif - -#ifndef PAGE_MASK -#define PAGE_MASK (~(PAGE_SIZE - 1)) -#endif - -void init_memory(memory_t* memory, const map_info_t* map_info_list) { - memory->tid = -1; - memory->map_info_list = map_info_list; -} - -void init_memory_ptrace(memory_t* memory, pid_t tid) { - memory->tid = tid; - memory->map_info_list = NULL; -} - -bool try_get_word(const memory_t* memory, uintptr_t ptr, uint32_t* out_value) { - ALOGV("try_get_word: reading word at %p", (void*) ptr); - if (ptr & 3) { - ALOGV("try_get_word: invalid pointer %p", (void*) ptr); - *out_value = 0xffffffffL; - return false; - } - if (memory->tid < 0) { - if (!is_readable_map(memory->map_info_list, ptr)) { - ALOGV("try_get_word: pointer %p not in a readable map", (void*) ptr); - *out_value = 0xffffffffL; - return false; - } - *out_value = *(uint32_t*)ptr; - return true; - } else { -#if defined(__APPLE__) - ALOGV("no ptrace on Mac OS"); - return false; -#else - // ptrace() returns -1 and sets errno when the operation fails. - // To disambiguate -1 from a valid result, we clear errno beforehand. - errno = 0; - *out_value = ptrace(PTRACE_PEEKTEXT, memory->tid, (void*)ptr, NULL); - if (*out_value == 0xffffffffL && errno) { - ALOGV("try_get_word: invalid pointer 0x%08x reading from tid %d, " - "ptrace() errno=%d", ptr, memory->tid, errno); - return false; - } - return true; -#endif - } -} - -bool try_get_word_ptrace(pid_t tid, uintptr_t ptr, uint32_t* out_value) { - memory_t memory; - init_memory_ptrace(&memory, tid); - return try_get_word(&memory, ptr, out_value); -} - -static void load_ptrace_map_info_data(pid_t pid, map_info_t* mi) { - if (mi->is_executable && mi->is_readable) { - uint32_t elf_magic; - if (try_get_word_ptrace(pid, mi->start, &elf_magic) && elf_magic == ELF_MAGIC) { - map_info_data_t* data = (map_info_data_t*)calloc(1, sizeof(map_info_data_t)); - if (data) { - mi->data = data; - if (mi->name[0]) { - data->symbol_table = load_symbol_table(mi->name); - } -#ifdef CORKSCREW_HAVE_ARCH - load_ptrace_map_info_data_arch(pid, mi, data); -#endif - } - } - } -} - -ptrace_context_t* load_ptrace_context(pid_t pid) { - ptrace_context_t* context = - (ptrace_context_t*)calloc(1, sizeof(ptrace_context_t)); - if (context) { - context->map_info_list = load_map_info_list(pid); - for (map_info_t* mi = context->map_info_list; mi; mi = mi->next) { - load_ptrace_map_info_data(pid, mi); - } - } - return context; -} - -static void free_ptrace_map_info_data(map_info_t* mi) { - map_info_data_t* data = (map_info_data_t*)mi->data; - if (data) { - if (data->symbol_table) { - free_symbol_table(data->symbol_table); - } -#ifdef CORKSCREW_HAVE_ARCH - free_ptrace_map_info_data_arch(mi, data); -#endif - free(data); - mi->data = NULL; - } -} - -void free_ptrace_context(ptrace_context_t* context) { - for (map_info_t* mi = context->map_info_list; mi; mi = mi->next) { - free_ptrace_map_info_data(mi); - } - free_map_info_list(context->map_info_list); - free(context); -} - -void find_symbol_ptrace(const ptrace_context_t* context, - uintptr_t addr, const map_info_t** out_map_info, const symbol_t** out_symbol) { - const map_info_t* mi = find_map_info(context->map_info_list, addr); - const symbol_t* symbol = NULL; - if (mi) { - const map_info_data_t* data = (const map_info_data_t*)mi->data; - if (data && data->symbol_table) { - symbol = find_symbol(data->symbol_table, addr - mi->start); - } - } - *out_map_info = mi; - *out_symbol = symbol; -} |