// Copyright 2014 The Crashpad Authors
//
// 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 "snapshot/mac/cpu_context_mac.h"
#include <stddef.h>
#include <string.h>
#include "base/logging.h"
#include "base/notreached.h"
namespace crashpad {
#if defined(ARCH_CPU_X86_FAMILY)
namespace {
void InitializeCPUContextX86Thread(
CPUContextX86* context,
const x86_thread_state32_t* x86_thread_state32) {
context->eax = x86_thread_state32->__eax;
context->ebx = x86_thread_state32->__ebx;
context->ecx = x86_thread_state32->__ecx;
context->edx = x86_thread_state32->__edx;
context->edi = x86_thread_state32->__edi;
context->esi = x86_thread_state32->__esi;
context->ebp = x86_thread_state32->__ebp;
context->esp = x86_thread_state32->__esp;
context->eip = x86_thread_state32->__eip;
context->eflags = x86_thread_state32->__eflags;
context->cs = x86_thread_state32->__cs;
context->ds = x86_thread_state32->__ds;
context->es = x86_thread_state32->__es;
context->fs = x86_thread_state32->__fs;
context->gs = x86_thread_state32->__gs;
context->ss = x86_thread_state32->__ss;
}
void InitializeCPUContextX86Float(
CPUContextX86* context, const x86_float_state32_t* x86_float_state32) {
// This relies on both x86_float_state32_t and context->fxsave having
// identical (fxsave) layout.
static_assert(offsetof(x86_float_state32_t, __fpu_reserved1) -
offsetof(x86_float_state32_t, __fpu_fcw) ==
sizeof(context->fxsave),
"types must be equivalent");
memcpy(
&context->fxsave, &x86_float_state32->__fpu_fcw, sizeof(context->fxsave));
}
void InitializeCPUContextX86Debug(
CPUContextX86* context, const x86_debug_state32_t* x86_debug_state32) {
context->dr0 = x86_debug_state32->__dr0;
context->dr1 = x86_debug_state32->__dr1;
context->dr2 = x86_debug_state32->__dr2;
context->dr3 = x86_debug_state32->__dr3;
context->dr4 = x86_debug_state32->__dr4;
context->dr5 = x86_debug_state32->__dr5;
context->dr6 = x86_debug_state32->__dr6;
context->dr7 = x86_debug_state32->__dr7;
}
// Initializes |context| from the native thread state structure |state|, which
// is interpreted according to |flavor|. |state_count| must be at least the
// expected size for |flavor|. This handles the architecture-specific
// x86_THREAD_STATE32, x86_FLOAT_STATE32, and x86_DEBUG_STATE32 flavors. It also
// handles the universal x86_THREAD_STATE, x86_FLOAT_STATE, and x86_DEBUG_STATE
// flavors provided that the associated structure carries 32-bit data of the
// corresponding state type. |flavor| may be THREAD_STATE_NONE to avoid setting
// any thread state in |context|. This returns the architecture-specific flavor
// value for the thread state that was actually set, or THREAD_STATE_NONE if no
// thread state was set.
thread_state_flavor_t InitializeCPUContextX86Flavor(
CPUContextX86* context,
thread_state_flavor_t flavor,
ConstThreadState state,
mach_msg_type_number_t state_count) {
mach_msg_type_number_t expected_state_count;
switch (flavor) {
case x86_THREAD_STATE:
expected_state_count = x86_THREAD_STATE_COUNT;
break;
case x86_FLOAT_STATE:
expected_state_count = x86_FLOAT_STATE_COUNT;
break;
case x86_DEBUG_STATE:
expected_state_count = x86_DEBUG_STATE_COUNT;
break;
case x86_THREAD_STATE32:
expected_state_count = x86_THREAD_STATE32_COUNT;
break;
case x86_FLOAT_STATE32:
expected_state_count = x86_FLOAT_STATE32_COUNT;
break;
case x86_DEBUG_STATE32:
expected_state_count = x86_DEBUG_STATE32_COUNT;
break;
case THREAD_STATE_NONE:
expected_state_count = 0;
break;
default:
LOG(WARNING) << "unhandled flavor " << flavor;
return THREAD_STATE_NONE;
}
if (state_count < expected_state_count) {
LOG(WARNING) << "expected state_count " << expected_state_count
<< " for flavor " << flavor << ", observed " << state_count;
return THREAD_STATE_NONE;
}
switch (flavor) {
case x86_THREAD_STATE: {
const x86_thread_state_t* x86_thread_state =
reinterpret_cast<const x86_thread_state_t*>(state);
if (x86_thread_state->tsh.flavor != x86_THREAD_STATE32) {
LOG(WARNING) << "expected flavor x86_THREAD_STATE32, observed "
<< x86_thread_state->tsh.flavor;
return THREAD_STATE_NONE;
}
return InitializeCPUContextX86Flavor(
context,
x86_thread_state->tsh.flavor,
reinterpret_cast<ConstThreadState>(&x86_thread_state->uts.ts32),
x86_thread_state->tsh.count);
}
case x86_FLOAT_STATE: {
const x86_float_state_t* x86_float_state =
reinterpret_cast<const x86_float_state_t*>(state);
if (x86_float_state->fsh.flavor != x86_FLOAT_STATE32) {
LOG(WARNING) << "expected flavor x86_FLOAT_STATE32, observed "
<< x86_float_state->fsh.flavor;
return THREAD_STATE_NONE;
}
return InitializeCPUContextX86Flavor(
context,
x86_float_state->fsh.flavor,
reinterpret_cast<ConstThreadState>(&x86_float_state->ufs.fs32),
x86_float_state->fsh.count);
}
case x86_DEBUG_STATE: {
const x86_debug_state_t* x86_debug_state =
reinterpret_cast<const x86_debug_state_t*>(state);
if (x86_debug_state->dsh.flavor != x86_DEBUG_STATE32) {
LOG(WARNING) << "expected flavor x86_DEBUG_STATE32, observed "
<< x86_debug_state->dsh.flavor;
return THREAD_STATE_NONE;
}
return InitializeCPUContextX86Flavor(
context,
x86_debug_state->dsh.flavor,
reinterpret_cast<ConstThreadState>(&x86_debug_state->uds.ds32),
x86_debug_state->dsh.count);
}
case x86_THREAD_STATE32: {
const x86_thread_state32_t* x86_thread_state32 =
reinterpret_cast<const x86_thread_state32_t*>(state);
InitializeCPUContextX86Thread(context, x86_thread_state32);
return flavor;
}
case x86_FLOAT_STATE32: {
const x86_float_state32_t* x86_float_state32 =
reinterpret_cast<const x86_float_state32_t*>(state);
InitializeCPUContextX86Float(context, x86_float_state32);
return flavor;
}
case x86_DEBUG_STATE32: {
const x86_debug_state32_t* x86_debug_state32 =
reinterpret_cast<const x86_debug_state32_t*>(state);
InitializeCPUContextX86Debug(context, x86_debug_state32);
return flavor;
}
case THREAD_STATE_NONE: {
// This may happen without error when called without exception-style
// flavor data, or even from an exception handler when the exception
// behavior is EXCEPTION_DEFAULT.
return flavor;
}
default: {
NOTREACHED();
}
}
}
void InitializeCPUContextX86_64Thread(
CPUContextX86_64* context, const x86_thread_state64_t* x86_thread_state64) {
context->rax = x86_thread_state64->__rax;
context->rbx = x86_thread_state64->__rbx;
context->rcx = x86_thread_state64->__rcx;
context->rdx = x86_thread_state64->__rdx;
context->rdi = x86_thread_state64->__rdi;
context->rsi = x86_thread_state64->__rsi;
context->rbp = x86_thread_state64->__rbp;
context->rsp = x86_thread_state64->__rsp;
context->r8 = x86_thread_state64->__r8;
context->r9 = x86_thread_state64->__r9;
context->r10 = x86_thread_state64->__r10;
context->r11 = x86_thread_state64->__r11;
context->r12 = x86_thread_state64->__r12;
context->r13 = x86_thread_state64->__r13;
context->r14 = x86_thread_state64->__r14;
context->r15 = x86_thread_state64->__r15;
context->rip = x86_thread_state64->__rip;
context->rflags = x86_thread_state64->__rflags;
context->cs = x86_thread_state64->__cs;
context->fs = x86_thread_state64->__fs;
context->gs = x86_thread_state64->__gs;
}
void InitializeCPUContextX86_64Float(
CPUContextX86_64* context, const x86_float_state64_t* x86_float_state64) {
// This relies on both x86_float_state64_t and context->fxsave having
// identical (fxsave) layout.
static_assert(offsetof(x86_float_state64_t, __fpu_reserved1) -
offsetof(x86_float_state64_t, __fpu_fcw) ==
sizeof(context->fxsave),
"types must be equivalent");
memcpy(&context->fxsave,
&x86_float_state64->__fpu_fcw,
sizeof(context->fxsave));
}
void InitializeCPUContextX86_64Debug(
CPUContextX86_64* context, const x86_debug_state64_t* x86_debug_state64) {
context->dr0 = x86_debug_state64->__dr0;
context->dr1 = x86_debug_state64->__dr1;
context->dr2 = x86_debug_state64->__dr2;
context->dr3 = x86_debug_state64->__dr3;
context->dr4 = x86_debug_state64->__dr4;
context->dr5 = x86_debug_state64->__dr5;
context->dr6 = x86_debug_state64->__dr6;
context->dr7 = x86_debug_state64->__dr7;
}
// Initializes |context| from the native thread state structure |state|, which
// is interpreted according to |flavor|. |state_count| must be at least the
// expected size for |flavor|. This handles the architecture-specific
// x86_THREAD_STATE64, x86_FLOAT_STATE64, and x86_DEBUG_STATE64 flavors. It also
// handles the universal x86_THREAD_STATE, x86_FLOAT_STATE, and x86_DEBUG_STATE
// flavors provided that the associated structure carries 64-bit data of the
// corresponding state type. |flavor| may be THREAD_STATE_NONE to avoid setting
// any thread state in |context|. This returns the architecture-specific flavor
// value for the thread state that was actually set, or THREAD_STATE_NONE if no
// thread state was set.
thread_state_flavor_t InitializeCPUContextX86_64Flavor(
CPUContextX86_64* context,
thread_state_flavor_t flavor,
ConstThreadState state,
mach_msg_type_number_t state_count) {
mach_msg_type_number_t expected_state_count;
switch (flavor) {
case x86_THREAD_STATE:
expected_state_count = x86_THREAD_STATE_COUNT;
break;
case x86_FLOAT_STATE:
expected_state_count = x86_FLOAT_STATE_COUNT;
break;
case x86_DEBUG_STATE:
expected_state_count = x86_DEBUG_STATE_COUNT;
break;
case x86_THREAD_STATE64:
expected_state_count = x86_THREAD_STATE64_COUNT;
break;
case x86_FLOAT_STATE64:
expected_state_count = x86_FLOAT_STATE64_COUNT;
break;
case x86_DEBUG_STATE64:
expected_state_count = x86_DEBUG_STATE64_COUNT;
break;
case THREAD_STATE_NONE:
expected_state_count = 0;
break;
default:
LOG(WARNING) << "unhandled flavor " << flavor;
return THREAD_STATE_NONE;
}
if (state_count < expected_state_count) {
LOG(WARNING) << "expected state_count " << expected_state_count
<< " for flavor " << flavor << ", observed " << state_count;
return THREAD_STATE_NONE;
}
switch (flavor) {
case x86_THREAD_STATE: {
const x86_thread_state_t* x86_thread_state =
reinterpret_cast<const x86_thread_state_t*>(state);
if (x86_thread_state->tsh.flavor != x86_THREAD_STATE64) {
LOG(WARNING) << "expected flavor x86_THREAD_STATE64, observed "
<< x86_thread_state->tsh.flavor;
return THREAD_STATE_NONE;
}
return InitializeCPUContextX86_64Flavor(
context,
x86_thread_state->tsh.flavor,
reinterpret_cast<ConstThreadState>(&x86_thread_state->uts.ts64),
x86_thread_state->tsh.count);
}
case x86_FLOAT_STATE: {
const x86_float_state_t* x86_float_state =
reinterpret_cast<const x86_float_state_t*>(state);
if (x86_float_state->fsh.flavor != x86_FLOAT_STATE64) {
LOG(WARNING) << "expected flavor x86_FLOAT_STATE64, observed "
<< x86_float_state->fsh.flavor;
return THREAD_STATE_NONE;
}
return InitializeCPUContextX86_64Flavor(
context,
x86_float_state->fsh.flavor,
reinterpret_cast<ConstThreadState>(&x86_float_state->ufs.fs64),
x86_float_state->fsh.count);
}
case x86_DEBUG_STATE: {
const x86_debug_state_t* x86_debug_state =
reinterpret_cast<const x86_debug_state_t*>(state);
if (x86_debug_state->dsh.flavor != x86_DEBUG_STATE64) {
LOG(WARNING) << "expected flavor x86_DEBUG_STATE64, observed "
<< x86_debug_state->dsh.flavor;
return THREAD_STATE_NONE;
}
return InitializeCPUContextX86_64Flavor(
context,
x86_debug_state->dsh.flavor,
reinterpret_cast<ConstThreadState>(&x86_debug_state->uds.ds64),
x86_debug_state->dsh.count);
}
case x86_THREAD_STATE64: {
const x86_thread_state64_t* x86_thread_state64 =
reinterpret_cast<const x86_thread_state64_t*>(state);
InitializeCPUContextX86_64Thread(context, x86_thread_state64);
return flavor;
}
case x86_FLOAT_STATE64: {
const x86_float_state64_t* x86_float_state64 =
reinterpret_cast<const x86_float_state64_t*>(state);
InitializeCPUContextX86_64Float(context, x86_float_state64);
return flavor;
}
case x86_DEBUG_STATE64: {
const x86_debug_state64_t* x86_debug_state64 =
reinterpret_cast<const x86_debug_state64_t*>(state);
InitializeCPUContextX86_64Debug(context, x86_debug_state64);
return flavor;
}
case THREAD_STATE_NONE: {
// This may happen without error when called without exception-style
// flavor data, or even from an exception handler when the exception
// behavior is EXCEPTION_DEFAULT.
return flavor;
}
default: {
NOTREACHED();
}
}
}
} // namespace
namespace internal {
void InitializeCPUContextX86(CPUContextX86* context,
thread_state_flavor_t flavor,
ConstThreadState state,
mach_msg_type_number_t state_count,
const x86_thread_state32_t* x86_thread_state32,
const x86_float_state32_t* x86_float_state32,
const x86_debug_state32_t* x86_debug_state32) {
thread_state_flavor_t set_flavor = THREAD_STATE_NONE;
if (flavor != THREAD_STATE_NONE) {
set_flavor =
InitializeCPUContextX86Flavor(context, flavor, state, state_count);
}
if (set_flavor != x86_THREAD_STATE32) {
InitializeCPUContextX86Thread(context, x86_thread_state32);
}
if (set_flavor != x86_FLOAT_STATE32) {
InitializeCPUContextX86Float(context, x86_float_state32);
}
if (set_flavor != x86_DEBUG_STATE32) {
InitializeCPUContextX86Debug(context, x86_debug_state32);
}
}
void InitializeCPUContextX86_64(CPUContextX86_64* context,
thread_state_flavor_t flavor,
ConstThreadState state,
mach_msg_type_number_t state_count,
const x86_thread_state64_t* x86_thread_state64,
const x86_float_state64_t* x86_float_state64,
const x86_debug_state64_t* x86_debug_state64) {
thread_state_flavor_t set_flavor = THREAD_STATE_NONE;
if (flavor != THREAD_STATE_NONE) {
set_flavor =
InitializeCPUContextX86_64Flavor(context, flavor, state, state_count);
}
if (set_flavor != x86_THREAD_STATE64) {
InitializeCPUContextX86_64Thread(context, x86_thread_state64);
}
if (set_flavor != x86_FLOAT_STATE64) {
InitializeCPUContextX86_64Float(context, x86_float_state64);
}
if (set_flavor != x86_DEBUG_STATE64) {
InitializeCPUContextX86_64Debug(context, x86_debug_state64);
}
}
} // namespace internal
#elif defined(ARCH_CPU_ARM64)
namespace {
void InitializeCPUContextARM64Thread(
CPUContextARM64* context,
const arm_thread_state64_t* arm_thread_state64) {
// The first 29 fields of context->regs is laid out identically to
// arm_thread_state64->__x.
memcpy(
context->regs, arm_thread_state64->__x, sizeof(arm_thread_state64->__x));
context->regs[29] = arm_thread_state64_get_fp(*arm_thread_state64);
context->regs[30] = arm_thread_state64_get_lr(*arm_thread_state64);
context->sp = arm_thread_state64_get_sp(*arm_thread_state64);
context->pc = arm_thread_state64_get_pc(*arm_thread_state64);
context->spsr =
static_cast<decltype(context->spsr)>(arm_thread_state64->__cpsr);
}
void InitializeCPUContextARM64Neon(CPUContextARM64* context,
const arm_neon_state64_t* arm_neon_state64) {
static_assert(sizeof(context->fpsimd) == sizeof(arm_neon_state64->__v),
"fpsimd context size mismatch");
memcpy(context->fpsimd, arm_neon_state64->__v, sizeof(arm_neon_state64->__v));
context->fpsr = arm_neon_state64->__fpsr;
context->fpcr = arm_neon_state64->__fpcr;
}
void InitializeCPUContextARM64Debug(
CPUContextARM64* context,
const arm_debug_state64_t* arm_debug_state64) {
// TODO(macos_arm64): Create a spot in CPUContextARM64 to keep this.
}
thread_state_flavor_t InitializeCPUContextARM64Flavor(
CPUContextARM64* context,
thread_state_flavor_t flavor,
ConstThreadState state,
mach_msg_type_number_t state_count) {
mach_msg_type_number_t expected_state_count;
switch (flavor) {
case ARM_UNIFIED_THREAD_STATE:
expected_state_count = ARM_UNIFIED_THREAD_STATE_COUNT;
break;
case ARM_THREAD_STATE64:
expected_state_count = ARM_THREAD_STATE64_COUNT;
break;
case ARM_NEON_STATE64:
expected_state_count = ARM_NEON_STATE64_COUNT;
break;
case ARM_DEBUG_STATE64:
expected_state_count = ARM_DEBUG_STATE64_COUNT;
break;
case THREAD_STATE_NONE: {
// This may happen without error when called without exception-style
// flavor data, or even from an exception handler when the exception
// behavior is EXCEPTION_DEFAULT.
return flavor;
}
default:
LOG(WARNING) << "unhandled flavor " << flavor;
return THREAD_STATE_NONE;
}
if (state_count < expected_state_count) {
LOG(WARNING) << "expected state_count " << expected_state_count
<< " for flavor " << flavor << ", observed " << state_count;
return THREAD_STATE_NONE;
}
switch (flavor) {
case ARM_UNIFIED_THREAD_STATE: {
const arm_unified_thread_state_t* arm_thread_state =
reinterpret_cast<const arm_unified_thread_state_t*>(state);
if (arm_thread_state->ash.flavor != ARM_THREAD_STATE64) {
LOG(WARNING) << "expected flavor ARM_THREAD_STATE64, observed "
<< arm_thread_state->ash.flavor;
return THREAD_STATE_NONE;
}
return InitializeCPUContextARM64Flavor(
context,
arm_thread_state->ash.flavor,
reinterpret_cast<ConstThreadState>(&arm_thread_state->ts_64),
arm_thread_state->ash.count);
}
case ARM_THREAD_STATE64: {
const arm_thread_state64_t* arm_thread_state =
reinterpret_cast<const arm_thread_state64_t*>(state);
InitializeCPUContextARM64Thread(context, arm_thread_state);
return ARM_THREAD_STATE64;
}
case ARM_NEON_STATE64: {
const arm_neon_state64_t* arm_neon_state =
reinterpret_cast<const arm_neon_state64_t*>(state);
InitializeCPUContextARM64Neon(context, arm_neon_state);
return ARM_NEON_STATE64;
}
case ARM_DEBUG_STATE64: {
const arm_debug_state64_t* arm_debug_state =
reinterpret_cast<const arm_debug_state64_t*>(state);
InitializeCPUContextARM64Debug(context, arm_debug_state);
return ARM_DEBUG_STATE64;
}
case THREAD_STATE_NONE: {
// This may happen without error when called without exception-style
// flavor data, or even from an exception handler when the exception
// behavior is EXCEPTION_DEFAULT.
return flavor;
}
default: {
NOTREACHED();
}
}
}
} // namespace
namespace internal {
void InitializeCPUContextARM64(CPUContextARM64* context,
thread_state_flavor_t flavor,
ConstThreadState state,
mach_msg_type_number_t state_count,
const arm_thread_state64_t* arm_thread_state64,
const arm_neon_state64_t* arm_neon_state64,
const arm_debug_state64_t* arm_debug_state64) {
thread_state_flavor_t set_flavor = THREAD_STATE_NONE;
if (flavor != THREAD_STATE_NONE) {
set_flavor =
InitializeCPUContextARM64Flavor(context, flavor, state, state_count);
}
if (set_flavor != ARM_THREAD_STATE64) {
InitializeCPUContextARM64Thread(context, arm_thread_state64);
}
if (set_flavor != ARM_NEON_STATE64) {
InitializeCPUContextARM64Neon(context, arm_neon_state64);
}
if (set_flavor != ARM_DEBUG_STATE64) {
InitializeCPUContextARM64Debug(context, arm_debug_state64);
}
}
} // namespace internal
#endif
} // namespace crashpad
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