264 lines
8.3 KiB
C++
264 lines
8.3 KiB
C++
// Copyright 2015 The Crashpad Authors
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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/win/cpu_context_win.h"
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#include <stddef.h>
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#include <stdint.h>
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#include <string.h>
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#include "base/logging.h"
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#include "snapshot/cpu_context.h"
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namespace crashpad {
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namespace {
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// Validation for casts used with CPUContextX86::FsaveToFxsave().
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static_assert(sizeof(CPUContextX86::Fsave) ==
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offsetof(WOW64_FLOATING_SAVE_AREA, Cr0NpxState),
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"WoW64 fsave types must be equivalent");
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#if defined(ARCH_CPU_X86)
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static_assert(sizeof(CPUContextX86::Fsave) ==
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offsetof(FLOATING_SAVE_AREA, Spare0),
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"fsave types must be equivalent");
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#endif // ARCH_CPU_X86
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template <typename T>
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bool HasContextPart(const T* context, uint32_t bits) {
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return (context->ContextFlags & bits) == bits;
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}
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template <class T>
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void CommonInitializeX86Context(const T* context, CPUContextX86* out) {
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// This function assumes that the WOW64_CONTEXT_* and x86 CONTEXT_* values
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// for ContextFlags are identical. This can be tested when targeting 32-bit
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// x86.
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#if defined(ARCH_CPU_X86)
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static_assert(sizeof(CONTEXT) == sizeof(WOW64_CONTEXT),
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"type mismatch: CONTEXT");
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#define ASSERT_WOW64_EQUIVALENT(x) \
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do { \
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static_assert(x == WOW64_##x, "value mismatch: " #x); \
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} while (false)
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ASSERT_WOW64_EQUIVALENT(CONTEXT_i386);
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ASSERT_WOW64_EQUIVALENT(CONTEXT_i486);
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ASSERT_WOW64_EQUIVALENT(CONTEXT_CONTROL);
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ASSERT_WOW64_EQUIVALENT(CONTEXT_INTEGER);
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ASSERT_WOW64_EQUIVALENT(CONTEXT_SEGMENTS);
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ASSERT_WOW64_EQUIVALENT(CONTEXT_FLOATING_POINT);
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ASSERT_WOW64_EQUIVALENT(CONTEXT_DEBUG_REGISTERS);
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ASSERT_WOW64_EQUIVALENT(CONTEXT_EXTENDED_REGISTERS);
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ASSERT_WOW64_EQUIVALENT(CONTEXT_FULL);
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ASSERT_WOW64_EQUIVALENT(CONTEXT_ALL);
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ASSERT_WOW64_EQUIVALENT(CONTEXT_XSTATE);
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#undef ASSERT_WOW64_EQUIVALENT
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#endif // ARCH_CPU_X86
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memset(out, 0, sizeof(*out));
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LOG_IF(ERROR, !HasContextPart(context, WOW64_CONTEXT_i386))
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<< "non-x86 context";
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if (HasContextPart(context, WOW64_CONTEXT_CONTROL)) {
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out->ebp = context->Ebp;
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out->eip = context->Eip;
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out->cs = static_cast<uint16_t>(context->SegCs);
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out->eflags = context->EFlags;
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out->esp = context->Esp;
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out->ss = static_cast<uint16_t>(context->SegSs);
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}
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if (HasContextPart(context, WOW64_CONTEXT_INTEGER)) {
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out->eax = context->Eax;
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out->ebx = context->Ebx;
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out->ecx = context->Ecx;
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out->edx = context->Edx;
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out->edi = context->Edi;
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out->esi = context->Esi;
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}
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if (HasContextPart(context, WOW64_CONTEXT_SEGMENTS)) {
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out->ds = static_cast<uint16_t>(context->SegDs);
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out->es = static_cast<uint16_t>(context->SegEs);
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out->fs = static_cast<uint16_t>(context->SegFs);
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out->gs = static_cast<uint16_t>(context->SegGs);
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}
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if (HasContextPart(context, WOW64_CONTEXT_DEBUG_REGISTERS)) {
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out->dr0 = context->Dr0;
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out->dr1 = context->Dr1;
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out->dr2 = context->Dr2;
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out->dr3 = context->Dr3;
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// DR4 and DR5 are obsolete synonyms for DR6 and DR7, see
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// https://en.wikipedia.org/wiki/X86_debug_register.
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out->dr4 = context->Dr6;
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out->dr5 = context->Dr7;
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out->dr6 = context->Dr6;
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out->dr7 = context->Dr7;
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}
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if (HasContextPart(context, WOW64_CONTEXT_EXTENDED_REGISTERS)) {
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static_assert(sizeof(out->fxsave) == sizeof(context->ExtendedRegisters),
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"fxsave types must be equivalent");
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memcpy(&out->fxsave, &context->ExtendedRegisters, sizeof(out->fxsave));
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} else if (HasContextPart(context, WOW64_CONTEXT_FLOATING_POINT)) {
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// The static_assert that validates this cast can’t be here because it
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// relies on field names that vary based on the template parameter.
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CPUContextX86::FsaveToFxsave(
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*reinterpret_cast<const CPUContextX86::Fsave*>(&context->FloatSave),
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&out->fxsave);
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}
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}
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#if defined(ARCH_CPU_X86_64)
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DWORD64 CallGetEnabledXStateFeatures() {
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// GetEnabledXStateFeatures needs Windows 7 SP1.
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HINSTANCE kernel32 = GetModuleHandle(L"Kernel32.dll");
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decltype(GetEnabledXStateFeatures)* get_enabled_xstate_features =
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reinterpret_cast<decltype(GetEnabledXStateFeatures)*>(
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GetProcAddress(kernel32, "GetEnabledXStateFeatures"));
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if (!get_enabled_xstate_features)
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return 0;
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return get_enabled_xstate_features();
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}
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#endif // defined(ARCH_CPU_X64)
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} // namespace
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#if defined(ARCH_CPU_X86)
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void InitializeX86Context(const CONTEXT* context, CPUContextX86* out) {
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CommonInitializeX86Context(context, out);
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}
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#elif defined(ARCH_CPU_X86_64)
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void InitializeX86Context(const WOW64_CONTEXT* context, CPUContextX86* out) {
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CommonInitializeX86Context(context, out);
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}
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void InitializeX64Context(const CONTEXT* context, CPUContextX86_64* out) {
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memset(out, 0, sizeof(*out));
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LOG_IF(ERROR, !HasContextPart(context, CONTEXT_AMD64)) << "non-x64 context";
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if (HasContextPart(context, CONTEXT_CONTROL)) {
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out->cs = context->SegCs;
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out->rflags = context->EFlags;
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out->rip = context->Rip;
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out->rsp = context->Rsp;
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// SegSs ignored.
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}
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if (HasContextPart(context, CONTEXT_INTEGER)) {
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out->rax = context->Rax;
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out->rbx = context->Rbx;
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out->rcx = context->Rcx;
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out->rdx = context->Rdx;
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out->rdi = context->Rdi;
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out->rsi = context->Rsi;
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out->rbp = context->Rbp;
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out->r8 = context->R8;
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out->r9 = context->R9;
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out->r10 = context->R10;
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out->r11 = context->R11;
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out->r12 = context->R12;
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out->r13 = context->R13;
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out->r14 = context->R14;
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out->r15 = context->R15;
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}
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if (HasContextPart(context, CONTEXT_SEGMENTS)) {
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out->fs = context->SegFs;
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out->gs = context->SegGs;
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// SegDs ignored.
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// SegEs ignored.
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}
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if (HasContextPart(context, CONTEXT_DEBUG_REGISTERS)) {
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out->dr0 = context->Dr0;
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out->dr1 = context->Dr1;
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out->dr2 = context->Dr2;
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out->dr3 = context->Dr3;
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// DR4 and DR5 are obsolete synonyms for DR6 and DR7, see
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// https://en.wikipedia.org/wiki/X86_debug_register.
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out->dr4 = context->Dr6;
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out->dr5 = context->Dr7;
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out->dr6 = context->Dr6;
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out->dr7 = context->Dr7;
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}
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if (HasContextPart(context, CONTEXT_FLOATING_POINT)) {
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static_assert(sizeof(out->fxsave) == sizeof(context->FltSave),
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"types must be equivalent");
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memcpy(&out->fxsave, &context->FltSave, sizeof(out->fxsave));
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}
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}
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void InitializeX64XStateCet(const CONTEXT* context,
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XSAVE_CET_U_FORMAT* cet_u,
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CPUContextX86_64* out) {
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if (HasContextPart(context, CONTEXT_XSTATE)) {
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if (cet_u) {
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out->xstate.enabled_features |= XSTATE_MASK_CET_U;
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out->xstate.cet_u.cetmsr = cet_u->Ia32CetUMsr;
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out->xstate.cet_u.ssp = cet_u->Ia32Pl3SspMsr;
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}
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}
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}
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bool IsXStateFeatureEnabled(DWORD64 features) {
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static DWORD64 flags = CallGetEnabledXStateFeatures();
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return (flags & features) == features;
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}
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#elif defined(ARCH_CPU_ARM64)
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void InitializeARM64Context(const CONTEXT* context, CPUContextARM64* out) {
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memset(out, 0, sizeof(*out));
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LOG_IF(ERROR, !HasContextPart(context, CONTEXT_ARM64)) << "non-arm64 context";
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if (HasContextPart(context, CONTEXT_CONTROL)) {
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out->spsr = context->Cpsr;
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out->pc = context->Pc;
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out->regs[30] = context->Lr;
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out->sp = context->Sp;
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out->regs[29] = context->Fp;
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}
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if (HasContextPart(context, CONTEXT_INTEGER)) {
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memcpy(&out->regs[0], &context->X0, 18 * sizeof(context->X0));
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// Don't copy x18 which is reserved as platform register.
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memcpy(&out->regs[19], &context->X19, 10 * sizeof(context->X0));
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}
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if (HasContextPart(context, CONTEXT_FLOATING_POINT)) {
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static_assert(sizeof(out->fpsimd) == sizeof(context->V),
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"types must be equivalent");
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memcpy(&out->fpsimd, &context->V, sizeof(out->fpsimd));
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}
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}
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#else
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#error Unsupported Windows Arch
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#endif // ARCH_CPU_X86
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} // namespace crashpad
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