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/*
* Copyright (C) 2016 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.
*/
#include <elf.h>
#include <errno.h>
#include <inttypes.h>
#include <signal.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ptrace.h>
#include <sys/types.h>
#include <unistd.h>
#include <unwindstack/Elf.h>
#include <unwindstack/JitDebug.h>
#include <unwindstack/Maps.h>
#include <unwindstack/Memory.h>
#include <unwindstack/Regs.h>
#include <unwindstack/Unwinder.h>
static bool Attach(pid_t pid) {
if (ptrace(PTRACE_SEIZE, pid, 0, 0) == -1) {
return false;
}
if (ptrace(PTRACE_INTERRUPT, pid, 0, 0) == -1) {
ptrace(PTRACE_DETACH, pid, 0, 0);
return false;
}
// Allow at least 1 second to attach properly.
for (size_t i = 0; i < 1000; i++) {
siginfo_t si;
if (ptrace(PTRACE_GETSIGINFO, pid, 0, &si) == 0) {
return true;
}
usleep(1000);
}
printf("%d: Failed to stop.\n", pid);
return false;
}
void DoUnwind(pid_t pid) {
unwindstack::Regs* regs = unwindstack::Regs::RemoteGet(pid);
if (regs == nullptr) {
printf("Unable to get remote reg data\n");
return;
}
printf("ABI: ");
switch (regs->Arch()) {
case unwindstack::ARCH_ARM:
printf("arm");
break;
case unwindstack::ARCH_X86:
printf("x86");
break;
case unwindstack::ARCH_ARM64:
printf("arm64");
break;
case unwindstack::ARCH_X86_64:
printf("x86_64");
break;
case unwindstack::ARCH_MIPS:
printf("mips");
break;
case unwindstack::ARCH_MIPS64:
printf("mips64");
break;
default:
printf("unknown\n");
return;
}
printf("\n");
unwindstack::UnwinderFromPid unwinder(1024, pid);
if (!unwinder.Init()) {
printf("Failed to init unwinder object.\n");
return;
}
unwinder.SetRegs(regs);
unwinder.Unwind();
// Print the frames.
for (size_t i = 0; i < unwinder.NumFrames(); i++) {
printf("%s\n", unwinder.FormatFrame(i).c_str());
}
}
int main(int argc, char** argv) {
if (argc != 2) {
printf("Usage: unwind <PID>\n");
return 1;
}
pid_t pid = atoi(argv[1]);
if (!Attach(pid)) {
printf("Failed to attach to pid %d: %s\n", pid, strerror(errno));
return 1;
}
DoUnwind(pid);
ptrace(PTRACE_DETACH, pid, 0, 0);
return 0;
}
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