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Christopher Ferris17e91d42013-10-21 13:30:52 -07001/*
2 * Copyright (C) 2013 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
Christopher Ferris46756822014-01-14 20:16:30 -080017#include <backtrace/Backtrace.h>
18#include <backtrace/BacktraceMap.h>
Christopher Ferris17e91d42013-10-21 13:30:52 -070019
20#include <sys/types.h>
21#include <string.h>
22
Christopher Ferris17e91d42013-10-21 13:30:52 -070023#include <libunwind.h>
24#include <libunwind-ptrace.h>
25
Christopher Ferrise2960912014-03-07 19:42:19 -080026#include "BacktraceLog.h"
Christopher Ferrisdf290612014-01-22 19:21:07 -080027#include "UnwindMap.h"
Christopher Ferris17e91d42013-10-21 13:30:52 -070028#include "UnwindPtrace.h"
29
30UnwindPtrace::UnwindPtrace() : addr_space_(NULL), upt_info_(NULL) {
31}
32
33UnwindPtrace::~UnwindPtrace() {
34 if (upt_info_) {
35 _UPT_destroy(upt_info_);
36 upt_info_ = NULL;
37 }
38 if (addr_space_) {
Christopher Ferrisdf290612014-01-22 19:21:07 -080039 // Remove the map from the address space before destroying it.
40 // It will be freed in the UnwindMap destructor.
41 unw_map_set(addr_space_, NULL);
42
Christopher Ferris17e91d42013-10-21 13:30:52 -070043 unw_destroy_addr_space(addr_space_);
44 addr_space_ = NULL;
45 }
46}
47
Christopher Ferrisa2efd3a2014-05-06 15:23:59 -070048bool UnwindPtrace::Unwind(size_t num_ignore_frames, ucontext_t* ucontext) {
49 if (ucontext) {
50 BACK_LOGW("Unwinding from a specified context not supported yet.");
51 return false;
52 }
53
Christopher Ferris17e91d42013-10-21 13:30:52 -070054 addr_space_ = unw_create_addr_space(&_UPT_accessors, 0);
55 if (!addr_space_) {
Christopher Ferris8ed46272013-10-29 15:44:25 -070056 BACK_LOGW("unw_create_addr_space failed.");
Christopher Ferris17e91d42013-10-21 13:30:52 -070057 return false;
58 }
59
Christopher Ferrisdf290612014-01-22 19:21:07 -080060 UnwindMap* map = static_cast<UnwindMap*>(GetMap());
61 unw_map_set(addr_space_, map->GetMapCursor());
62
63 upt_info_ = reinterpret_cast<struct UPT_info*>(_UPT_create(Tid()));
Christopher Ferris17e91d42013-10-21 13:30:52 -070064 if (!upt_info_) {
Christopher Ferris8ed46272013-10-29 15:44:25 -070065 BACK_LOGW("Failed to create upt info.");
Christopher Ferris17e91d42013-10-21 13:30:52 -070066 return false;
67 }
68
Christopher Ferris17e91d42013-10-21 13:30:52 -070069 unw_cursor_t cursor;
70 int ret = unw_init_remote(&cursor, addr_space_, upt_info_);
71 if (ret < 0) {
Christopher Ferris8ed46272013-10-29 15:44:25 -070072 BACK_LOGW("unw_init_remote failed %d", ret);
Christopher Ferris17e91d42013-10-21 13:30:52 -070073 return false;
74 }
75
Christopher Ferris46756822014-01-14 20:16:30 -080076 std::vector<backtrace_frame_data_t>* frames = GetFrames();
77 frames->reserve(MAX_BACKTRACE_FRAMES);
78 size_t num_frames = 0;
Christopher Ferris17e91d42013-10-21 13:30:52 -070079 do {
80 unw_word_t pc;
81 ret = unw_get_reg(&cursor, UNW_REG_IP, &pc);
82 if (ret < 0) {
Christopher Ferris8ed46272013-10-29 15:44:25 -070083 BACK_LOGW("Failed to read IP %d", ret);
Christopher Ferris17e91d42013-10-21 13:30:52 -070084 break;
85 }
86 unw_word_t sp;
87 ret = unw_get_reg(&cursor, UNW_REG_SP, &sp);
88 if (ret < 0) {
Christopher Ferris8ed46272013-10-29 15:44:25 -070089 BACK_LOGW("Failed to read SP %d", ret);
Christopher Ferris17e91d42013-10-21 13:30:52 -070090 break;
91 }
92
93 if (num_ignore_frames == 0) {
Christopher Ferris46756822014-01-14 20:16:30 -080094 frames->resize(num_frames+1);
95 backtrace_frame_data_t* frame = &frames->at(num_frames);
Christopher Ferris20303f82014-01-10 16:33:16 -080096 frame->num = num_frames;
Christopher Ferris17e91d42013-10-21 13:30:52 -070097 frame->pc = static_cast<uintptr_t>(pc);
98 frame->sp = static_cast<uintptr_t>(sp);
99 frame->stack_size = 0;
Christopher Ferris17e91d42013-10-21 13:30:52 -0700100
101 if (num_frames > 0) {
Christopher Ferris46756822014-01-14 20:16:30 -0800102 backtrace_frame_data_t* prev = &frames->at(num_frames-1);
Christopher Ferris17e91d42013-10-21 13:30:52 -0700103 prev->stack_size = frame->sp - prev->sp;
104 }
105
Christopher Ferrisdf290612014-01-22 19:21:07 -0800106 frame->func_name = GetFunctionName(frame->pc, &frame->func_offset);
Christopher Ferris17e91d42013-10-21 13:30:52 -0700107
Christopher Ferrisdf290612014-01-22 19:21:07 -0800108 frame->map = FindMap(frame->pc);
Christopher Ferris17e91d42013-10-21 13:30:52 -0700109
Christopher Ferris46756822014-01-14 20:16:30 -0800110 num_frames++;
Christopher Ferris17e91d42013-10-21 13:30:52 -0700111 } else {
112 num_ignore_frames--;
113 }
114 ret = unw_step (&cursor);
Christopher Ferris46756822014-01-14 20:16:30 -0800115 } while (ret > 0 && num_frames < MAX_BACKTRACE_FRAMES);
Christopher Ferris17e91d42013-10-21 13:30:52 -0700116
117 return true;
118}
119
120std::string UnwindPtrace::GetFunctionNameRaw(uintptr_t pc, uintptr_t* offset) {
121 *offset = 0;
122 char buf[512];
123 unw_word_t value;
124 if (unw_get_proc_name_by_ip(addr_space_, pc, buf, sizeof(buf), &value,
125 upt_info_) >= 0 && buf[0] != '\0') {
126 *offset = static_cast<uintptr_t>(value);
127 return buf;
128 }
129 return "";
130}
131
132//-------------------------------------------------------------------------
133// C++ object creation function.
134//-------------------------------------------------------------------------
Christopher Ferris46756822014-01-14 20:16:30 -0800135Backtrace* CreatePtraceObj(pid_t pid, pid_t tid, BacktraceMap* map) {
136 return new BacktracePtrace(new UnwindPtrace(), pid, tid, map);
Christopher Ferris17e91d42013-10-21 13:30:52 -0700137}