264 lines
10 KiB
C++
264 lines
10 KiB
C++
// Copyright 2014 The Crashpad Authors. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "snapshot/mac/exception_snapshot_mac.h"
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#include "base/logging.h"
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#include "base/strings/stringprintf.h"
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#include "snapshot/mac/cpu_context_mac.h"
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#include "snapshot/mac/process_reader_mac.h"
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#include "util/mach/exception_behaviors.h"
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#include "util/mach/exception_types.h"
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#include "util/mach/symbolic_constants_mach.h"
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#include "util/numeric/safe_assignment.h"
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namespace crashpad {
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namespace internal {
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ExceptionSnapshotMac::ExceptionSnapshotMac()
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: ExceptionSnapshot(),
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context_union_(),
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context_(),
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codes_(),
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thread_id_(0),
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exception_address_(0),
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exception_(0),
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exception_code_0_(0),
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initialized_() {
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}
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ExceptionSnapshotMac::~ExceptionSnapshotMac() {
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}
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bool ExceptionSnapshotMac::Initialize(ProcessReaderMac* process_reader,
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exception_behavior_t behavior,
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thread_t exception_thread,
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exception_type_t exception,
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const mach_exception_data_type_t* code,
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mach_msg_type_number_t code_count,
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thread_state_flavor_t flavor,
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ConstThreadState state,
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mach_msg_type_number_t state_count) {
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INITIALIZATION_STATE_SET_INITIALIZING(initialized_);
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codes_.push_back(exception);
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for (mach_msg_type_number_t code_index = 0;
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code_index < code_count;
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++code_index) {
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codes_.push_back(code[code_index]);
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}
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exception_ = exception;
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mach_exception_code_t exception_code_0 = code[0];
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if (exception_ == EXC_CRASH) {
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exception_ = ExcCrashRecoverOriginalException(
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exception_code_0, &exception_code_0, nullptr);
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if (!ExcCrashCouldContainException(exception_)) {
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LOG(WARNING) << base::StringPrintf(
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"exception %s invalid in EXC_CRASH",
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ExceptionToString(exception_, kUseFullName | kUnknownIsNumeric)
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.c_str());
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}
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}
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// The operations that follow put exception_code_0 (a mach_exception_code_t,
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// a typedef for int64_t) into exception_code_0_ (a uint32_t). The range
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// checks and bit shifts involved need the same signedness on both sides to
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// work properly.
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const uint64_t unsigned_exception_code_0 = exception_code_0;
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// ExceptionInfo() returns code[0] as a 32-bit value, but exception_code_0 is
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// a 64-bit value. The best treatment for this inconsistency depends on the
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// exception type.
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if (exception_ == EXC_RESOURCE || exception_ == EXC_GUARD) {
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// All 64 bits of code[0] are significant for these exceptions. See
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// <mach/exc_resource.h> for EXC_RESOURCE and 10.10
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// xnu-2782.1.97/bsd/kern/kern_guarded.c fd_guard_ast() for EXC_GUARD.
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// code[0] is structured similarly for these two exceptions.
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//
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// EXC_RESOURCE: see <kern/exc_resource.h>. The resource type and “flavor”
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// together define the resource and are in the highest bits. The resource
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// limit is in the lowest bits.
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//
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// EXC_GUARD: see 10.10 xnu-2782.1.97/osfmk/ipc/mach_port.c
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// mach_port_guard_exception() and xnu-2782.1.97/bsd/kern/kern_guarded.c
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// fd_guard_ast(). The guard type (GUARD_TYPE_MACH_PORT or GUARD_TYPE_FD)
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// and “flavor” (from the mach_port_guard_exception_codes or
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// guard_exception_codes enums) are in the highest bits. The violating Mach
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// port name or file descriptor number is in the lowest bits.
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// If MACH_EXCEPTION_CODES is not set in |behavior|, code[0] will only carry
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// 32 significant bits, and the interesting high bits will have been
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// truncated.
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if (!ExceptionBehaviorHasMachExceptionCodes(behavior)) {
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LOG(WARNING) << base::StringPrintf(
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"behavior %s invalid for exception %s",
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ExceptionBehaviorToString(
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behavior, kUseFullName | kUnknownIsNumeric | kUseOr).c_str(),
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ExceptionToString(exception_, kUseFullName | kUnknownIsNumeric)
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.c_str());
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}
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// Include the more-significant information from the high bits of code[0] in
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// the value to be returned by ExceptionInfo(). The full value of codes[0]
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// including the less-significant lower bits is still available via Codes().
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exception_code_0_ = unsigned_exception_code_0 >> 32;
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} else {
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// For other exceptions, code[0]’s values never exceed 32 bits.
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if (!base::IsValueInRangeForNumericType<decltype(exception_code_0_)>(
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unsigned_exception_code_0)) {
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LOG(WARNING) << base::StringPrintf("exception_code_0 0x%llx out of range",
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unsigned_exception_code_0);
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}
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exception_code_0_ = unsigned_exception_code_0;
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}
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const ProcessReaderMac::Thread* thread = nullptr;
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for (const ProcessReaderMac::Thread& loop_thread :
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process_reader->Threads()) {
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if (exception_thread == loop_thread.port) {
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thread = &loop_thread;
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break;
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}
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}
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if (!thread) {
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LOG(ERROR) << "exception_thread not found in task";
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return false;
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}
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thread_id_ = thread->id;
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// Normally, for EXC_BAD_ACCESS exceptions, the exception address is present
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// in code[1]. It may or may not be the instruction pointer address (usually
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// it’s not). code[1] may carry the exception address for other exception
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// types too, but it’s not guaranteed. But for all other exception types, the
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// instruction pointer will be the exception address, and in fact will be
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// equal to codes[1] when it’s carrying the exception address. In those cases,
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// just use the instruction pointer directly.
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bool code_1_is_exception_address = exception_ == EXC_BAD_ACCESS;
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#if defined(ARCH_CPU_X86_FAMILY)
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if (process_reader->Is64Bit()) {
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context_.architecture = kCPUArchitectureX86_64;
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context_.x86_64 = &context_union_.x86_64;
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InitializeCPUContextX86_64(context_.x86_64,
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flavor,
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state,
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state_count,
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&thread->thread_context.t64,
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&thread->float_context.f64,
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&thread->debug_context.d64);
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} else {
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context_.architecture = kCPUArchitectureX86;
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context_.x86 = &context_union_.x86;
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InitializeCPUContextX86(context_.x86,
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flavor,
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state,
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state_count,
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&thread->thread_context.t32,
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&thread->float_context.f32,
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&thread->debug_context.d32);
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}
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// For x86 and x86_64 EXC_BAD_ACCESS exceptions, some code[0] values indicate
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// that code[1] does not (or may not) carry the exception address:
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// EXC_I386_GPFLT (10.9.5 xnu-2422.115.4/osfmk/i386/trap.c user_trap() for
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// T_GENERAL_PROTECTION) and the oddball (VM_PROT_READ | VM_PROT_EXECUTE)
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// which collides with EXC_I386_BOUNDFLT (10.9.5
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// xnu-2422.115.4/osfmk/i386/fpu.c fpextovrflt()). Other EXC_BAD_ACCESS
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// exceptions come through 10.9.5 xnu-2422.115.4/osfmk/i386/trap.c
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// user_page_fault_continue() and do contain the exception address in code[1].
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if (exception_ == EXC_BAD_ACCESS &&
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(exception_code_0_ == EXC_I386_GPFLT ||
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exception_code_0_ == (VM_PROT_READ | VM_PROT_EXECUTE))) {
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code_1_is_exception_address = false;
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}
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#elif defined(ARCH_CPU_ARM64)
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context_.architecture = kCPUArchitectureARM64;
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context_.arm64 = &context_union_.arm64;
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InitializeCPUContextARM64(context_.arm64,
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flavor,
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state,
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state_count,
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&thread->thread_context,
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&thread->float_context,
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&thread->debug_context);
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#else
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#error Port to your architecture
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#endif
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if (code_1_is_exception_address) {
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if (process_reader->Is64Bit() &&
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!ExceptionBehaviorHasMachExceptionCodes(behavior)) {
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// If code[1] is an address from a 64-bit process, the exception must have
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// been received with MACH_EXCEPTION_CODES or the address will have been
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// truncated.
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LOG(WARNING) << base::StringPrintf(
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"behavior %s invalid for exception %s code %d in 64-bit process",
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ExceptionBehaviorToString(
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behavior, kUseFullName | kUnknownIsNumeric | kUseOr).c_str(),
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ExceptionToString(exception_, kUseFullName | kUnknownIsNumeric)
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.c_str(),
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exception_code_0_);
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}
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exception_address_ = code[1];
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} else {
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exception_address_ = context_.InstructionPointer();
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}
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INITIALIZATION_STATE_SET_VALID(initialized_);
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return true;
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}
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const CPUContext* ExceptionSnapshotMac::Context() const {
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INITIALIZATION_STATE_DCHECK_VALID(initialized_);
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return &context_;
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}
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uint64_t ExceptionSnapshotMac::ThreadID() const {
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INITIALIZATION_STATE_DCHECK_VALID(initialized_);
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return thread_id_;
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}
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uint32_t ExceptionSnapshotMac::Exception() const {
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INITIALIZATION_STATE_DCHECK_VALID(initialized_);
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return exception_;
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}
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uint32_t ExceptionSnapshotMac::ExceptionInfo() const {
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INITIALIZATION_STATE_DCHECK_VALID(initialized_);
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return exception_code_0_;
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}
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uint64_t ExceptionSnapshotMac::ExceptionAddress() const {
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INITIALIZATION_STATE_DCHECK_VALID(initialized_);
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return exception_address_;
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}
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const std::vector<uint64_t>& ExceptionSnapshotMac::Codes() const {
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INITIALIZATION_STATE_DCHECK_VALID(initialized_);
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return codes_;
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}
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std::vector<const MemorySnapshot*> ExceptionSnapshotMac::ExtraMemory() const {
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INITIALIZATION_STATE_DCHECK_VALID(initialized_);
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return std::vector<const MemorySnapshot*>();
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}
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} // namespace internal
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} // namespace crashpad
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