diff options
Diffstat (limited to 'toolkit/crashreporter/breakpad-client/linux/minidump_writer/linux_core_dumper.cc')
| -rw-r--r-- | toolkit/crashreporter/breakpad-client/linux/minidump_writer/linux_core_dumper.cc | 308 |
1 files changed, 308 insertions, 0 deletions
diff --git a/toolkit/crashreporter/breakpad-client/linux/minidump_writer/linux_core_dumper.cc b/toolkit/crashreporter/breakpad-client/linux/minidump_writer/linux_core_dumper.cc new file mode 100644 index 0000000000..38feb0aaa7 --- /dev/null +++ b/toolkit/crashreporter/breakpad-client/linux/minidump_writer/linux_core_dumper.cc @@ -0,0 +1,308 @@ +// Copyright (c) 2012, Google Inc. +// All rights reserved. +// +// Redistribution and use in source and binary forms, with or without +// modification, are permitted provided that the following conditions are +// met: +// +// * Redistributions of source code must retain the above copyright +// notice, this list of conditions and the following disclaimer. +// * Redistributions in binary form must reproduce the above +// copyright notice, this list of conditions and the following disclaimer +// in the documentation and/or other materials provided with the +// distribution. +// * Neither the name of Google Inc. nor the names of its +// contributors may be used to endorse or promote products derived from +// this software without specific prior written permission. +// +// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + +// linux_core_dumper.cc: Implement google_breakpad::LinuxCoreDumper. +// See linux_core_dumper.h for details. + +#include "linux/minidump_writer/linux_core_dumper.h" + +#include <asm/ptrace.h> +#include <assert.h> +#include <elf.h> +#include <stdio.h> +#include <string.h> +#include <sys/procfs.h> +#if defined(__mips__) && defined(__ANDROID__) +// To get register definitions. +#include <asm/reg.h> +#endif + +#include "common/linux/elf_gnu_compat.h" +#include "common/linux/linux_libc_support.h" + +namespace google_breakpad { + +LinuxCoreDumper::LinuxCoreDumper(pid_t pid, + const char* core_path, + const char* procfs_path, + const char* root_prefix) + : LinuxDumper(pid, root_prefix), + core_path_(core_path), + procfs_path_(procfs_path), + thread_infos_(&allocator_, 8) { + assert(core_path_); +} + +bool LinuxCoreDumper::BuildProcPath(char* path, pid_t pid, + const char* node) const { + if (!path || !node) + return false; + + size_t node_len = my_strlen(node); + if (node_len == 0) + return false; + + size_t procfs_path_len = my_strlen(procfs_path_); + size_t total_length = procfs_path_len + 1 + node_len; + if (total_length >= NAME_MAX) + return false; + + memcpy(path, procfs_path_, procfs_path_len); + path[procfs_path_len] = '/'; + memcpy(path + procfs_path_len + 1, node, node_len); + path[total_length] = '\0'; + return true; +} + +bool LinuxCoreDumper::CopyFromProcess(void* dest, pid_t child, + const void* src, size_t length) { + ElfCoreDump::Addr virtual_address = reinterpret_cast<ElfCoreDump::Addr>(src); + // TODO(benchan): Investigate whether the data to be copied could span + // across multiple segments in the core dump file. ElfCoreDump::CopyData + // and this method do not handle that case yet. + if (!core_.CopyData(dest, virtual_address, length)) { + // If the data segment is not found in the core dump, fill the result + // with marker characters. + memset(dest, 0xab, length); + return false; + } + return true; +} + +bool LinuxCoreDumper::GetThreadInfoByIndex(size_t index, ThreadInfo* info) { + if (index >= thread_infos_.size()) + return false; + + *info = thread_infos_[index]; + const uint8_t* stack_pointer; +#if defined(__i386) + memcpy(&stack_pointer, &info->regs.esp, sizeof(info->regs.esp)); +#elif defined(__x86_64) + memcpy(&stack_pointer, &info->regs.rsp, sizeof(info->regs.rsp)); +#elif defined(__ARM_EABI__) + memcpy(&stack_pointer, &info->regs.ARM_sp, sizeof(info->regs.ARM_sp)); +#elif defined(__aarch64__) + memcpy(&stack_pointer, &info->regs.sp, sizeof(info->regs.sp)); +#elif defined(__mips__) + stack_pointer = + reinterpret_cast<uint8_t*>(info->mcontext.gregs[MD_CONTEXT_MIPS_REG_SP]); +#else +#error "This code hasn't been ported to your platform yet." +#endif + info->stack_pointer = reinterpret_cast<uintptr_t>(stack_pointer); + return true; +} + +bool LinuxCoreDumper::GetThreadNameByIndex(size_t index, char* name, + size_t size) { + // Not implemented + return false; +} + +bool LinuxCoreDumper::IsPostMortem() const { + return true; +} + +bool LinuxCoreDumper::ThreadsSuspend() { + return true; +} + +bool LinuxCoreDumper::ThreadsResume() { + return true; +} + +bool LinuxCoreDumper::EnumerateThreads() { + if (!mapped_core_file_.Map(core_path_, 0)) { + fprintf(stderr, "Could not map core dump file into memory\n"); + return false; + } + + core_.SetContent(mapped_core_file_.content()); + if (!core_.IsValid()) { + fprintf(stderr, "Invalid core dump file\n"); + return false; + } + + ElfCoreDump::Note note = core_.GetFirstNote(); + if (!note.IsValid()) { + fprintf(stderr, "PT_NOTE section not found\n"); + return false; + } + + bool first_thread = true; + do { + ElfCoreDump::Word type = note.GetType(); + MemoryRange name = note.GetName(); + MemoryRange description = note.GetDescription(); + + if (type == 0 || name.IsEmpty() || description.IsEmpty()) { + fprintf(stderr, "Could not found a valid PT_NOTE.\n"); + return false; + } + + // Based on write_note_info() in linux/kernel/fs/binfmt_elf.c, notes are + // ordered as follows (NT_PRXFPREG and NT_386_TLS are i386 specific): + // Thread Name Type + // ------------------------------------------------------------------- + // 1st thread CORE NT_PRSTATUS + // process-wide CORE NT_PRPSINFO + // process-wide CORE NT_SIGINFO + // process-wide CORE NT_AUXV + // 1st thread CORE NT_FPREGSET + // 1st thread LINUX NT_PRXFPREG + // 1st thread LINUX NT_386_TLS + // + // 2nd thread CORE NT_PRSTATUS + // 2nd thread CORE NT_FPREGSET + // 2nd thread LINUX NT_PRXFPREG + // 2nd thread LINUX NT_386_TLS + // + // 3rd thread CORE NT_PRSTATUS + // 3rd thread CORE NT_FPREGSET + // 3rd thread LINUX NT_PRXFPREG + // 3rd thread LINUX NT_386_TLS + // + // The following code only works if notes are ordered as expected. + switch (type) { + case NT_PRSTATUS: { + if (description.length() != sizeof(elf_prstatus)) { + fprintf(stderr, "Found NT_PRSTATUS descriptor of unexpected size\n"); + return false; + } + + const elf_prstatus* status = + reinterpret_cast<const elf_prstatus*>(description.data()); + pid_t pid = status->pr_pid; + ThreadInfo info; + memset(&info, 0, sizeof(ThreadInfo)); + info.tgid = status->pr_pgrp; + info.ppid = status->pr_ppid; +#if defined(__mips__) +#if defined(__ANDROID__) + for (int i = EF_R0; i <= EF_R31; i++) + info.mcontext.gregs[i - EF_R0] = status->pr_reg[i]; +#else // __ANDROID__ + for (int i = EF_REG0; i <= EF_REG31; i++) + info.mcontext.gregs[i - EF_REG0] = status->pr_reg[i]; +#endif // __ANDROID__ + info.mcontext.mdlo = status->pr_reg[EF_LO]; + info.mcontext.mdhi = status->pr_reg[EF_HI]; + info.mcontext.pc = status->pr_reg[EF_CP0_EPC]; +#else // __mips__ + memcpy(&info.regs, status->pr_reg, sizeof(info.regs)); +#endif // __mips__ + if (first_thread) { + crash_thread_ = pid; + crash_signal_ = status->pr_info.si_signo; + crash_signal_code_ = status->pr_info.si_code; + } + first_thread = false; + threads_.push_back(pid); + thread_infos_.push_back(info); + break; + } + case NT_SIGINFO: { + if (description.length() != sizeof(siginfo_t)) { + fprintf(stderr, "Found NT_SIGINFO descriptor of unexpected size\n"); + return false; + } + + const siginfo_t* info = + reinterpret_cast<const siginfo_t*>(description.data()); + + // Set crash_address when si_addr is valid for the signal. + switch (info->si_signo) { + case MD_EXCEPTION_CODE_LIN_SIGBUS: + case MD_EXCEPTION_CODE_LIN_SIGFPE: + case MD_EXCEPTION_CODE_LIN_SIGILL: + case MD_EXCEPTION_CODE_LIN_SIGSEGV: + case MD_EXCEPTION_CODE_LIN_SIGSYS: + case MD_EXCEPTION_CODE_LIN_SIGTRAP: + crash_address_ = reinterpret_cast<uintptr_t>(info->si_addr); + break; + } + + // Set crash_exception_info for common signals. Since exception info is + // unsigned, but some of these fields might be signed, we always cast. + switch (info->si_signo) { + case MD_EXCEPTION_CODE_LIN_SIGKILL: + set_crash_exception_info({ + static_cast<uint64_t>(info->si_pid), + static_cast<uint64_t>(info->si_uid), + }); + break; + case MD_EXCEPTION_CODE_LIN_SIGSYS: +#ifdef si_syscall + set_crash_exception_info({ + static_cast<uint64_t>(info->si_syscall), + static_cast<uint64_t>(info->si_arch), + }); +#endif + break; + } + break; + } +#if defined(__i386) || defined(__x86_64) + case NT_FPREGSET: { + if (thread_infos_.empty()) + return false; + + ThreadInfo* info = &thread_infos_.back(); + if (description.length() != sizeof(info->fpregs)) { + fprintf(stderr, "Found NT_FPREGSET descriptor of unexpected size\n"); + return false; + } + + memcpy(&info->fpregs, description.data(), sizeof(info->fpregs)); + break; + } +#endif +#if defined(__i386) + case NT_PRXFPREG: { + if (thread_infos_.empty()) + return false; + + ThreadInfo* info = &thread_infos_.back(); + if (description.length() != sizeof(info->fpxregs)) { + fprintf(stderr, "Found NT_PRXFPREG descriptor of unexpected size\n"); + return false; + } + + memcpy(&info->fpxregs, description.data(), sizeof(info->fpxregs)); + break; + } +#endif + } + note = note.GetNextNote(); + } while (note.IsValid()); + + return true; +} + +} // namespace google_breakpad |