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crashpad/minidump/test/minidump_context_test_util.cc
Alex Gough 9e0051aba6 Write compacted xsave contexts in minidumps 
Adds new structures and offsets for minidump extended contexts. This
information will be captured from threads in a later CL so this CL
does not yet write different dumps, except in testing.

Minidump format for extended compacted contexts has been determined by
experiment. Offsets for where to write various parts of the context
are hardcoded to 0x550 as this matches values seen in Windows. Offsets
for misc_info_5 match those seen in working minidumps that can be opened
in windbg. Our hope is that while these could change in future, CPU
and OS vendors are unlikely to change them.

See doc[0] for a discussion of these fields and offsets in the minidump.

See "MANAGING STATE USING THE XSAVE FEATURE SET" Chapter 13 in the
Intel SDM[1]. Many of the offsets and sizes of the extended features
are provided by cpu specific values. We can access these in Windows
using the SDK, and transfer these to the saved extended context
which in turn is understandable by windbg.

Further information is available from AMD Ch. 18 "Shadow Stacks"[2].

    [0] https://docs.google.com/document/d/1Dn8n97r5B7kxYouvujNnPIYd_7QeVHpahSRmB92Qn6g/edit#heading=h.hivqj2jg39y
    [1] https://software.intel.com/content/www/us/en/develop/download/intel-64-and-ia-32-architectures-sdm-combined-volumes-1-2a-2b-2c-2d-3a-3b-3c-3d-and-4.html.
    [2] https://www.amd.com/system/files/TechDocs/24593.pdf

Bug: 1250098
Change-Id: Ia9041acc379c6d38329ee99737a2a0a77f7a1ee0
Reviewed-on: https://chromium-review.googlesource.com/c/crashpad/crashpad/+/3536964
Reviewed-by: Joshua Peraza <jperaza@chromium.org>
Commit-Queue: Alex Gough <ajgo@chromium.org>
2022-05-17 01:45:56 +00:00

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// Copyright 2014 The Crashpad Authors. All rights reserved.
//
// 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 "minidump/test/minidump_context_test_util.h"
#include <string.h>
#include <sys/types.h>
#include <iterator>
#include "base/format_macros.h"
#include "base/strings/stringprintf.h"
#include "gtest/gtest.h"
#include "snapshot/cpu_context.h"
#include "snapshot/test/test_cpu_context.h"
#include "test/hex_string.h"
namespace crashpad {
namespace test {
void InitializeMinidumpContextX86(MinidumpContextX86* context, uint32_t seed) {
if (seed == 0) {
memset(context, 0, sizeof(*context));
context->context_flags = kMinidumpContextX86;
return;
}
context->context_flags = kMinidumpContextX86All;
uint32_t value = seed;
context->eax = value++;
context->ebx = value++;
context->ecx = value++;
context->edx = value++;
context->edi = value++;
context->esi = value++;
context->ebp = value++;
context->esp = value++;
context->eip = value++;
context->eflags = value++;
context->cs = value++ & 0xffff;
context->ds = value++ & 0xffff;
context->es = value++ & 0xffff;
context->fs = value++ & 0xffff;
context->gs = value++ & 0xffff;
context->ss = value++ & 0xffff;
InitializeCPUContextX86Fxsave(&context->fxsave, &value);
CPUContextX86::FxsaveToFsave(context->fxsave, &context->fsave);
context->dr0 = value++;
context->dr1 = value++;
context->dr2 = value++;
context->dr3 = value++;
value += 2; // Minidumps don’t carry dr4 or dr5.
context->dr6 = value++;
context->dr7 = value++;
// Set this field last, because it has no analogue in CPUContextX86.
context->float_save.spare_0 = value++;
}
void InitializeMinidumpContextAMD64(MinidumpContextAMD64* context,
uint32_t seed) {
if (seed == 0) {
memset(context, 0, sizeof(*context));
context->context_flags = kMinidumpContextAMD64;
return;
}
context->context_flags = kMinidumpContextAMD64All;
uint32_t value = seed;
context->rax = value++;
context->rbx = value++;
context->rcx = value++;
context->rdx = value++;
context->rdi = value++;
context->rsi = value++;
context->rbp = value++;
context->rsp = value++;
context->r8 = value++;
context->r9 = value++;
context->r10 = value++;
context->r11 = value++;
context->r12 = value++;
context->r13 = value++;
context->r14 = value++;
context->r15 = value++;
context->rip = value++;
context->eflags = value++;
context->cs = static_cast<uint16_t>(value++);
context->fs = static_cast<uint16_t>(value++);
context->gs = static_cast<uint16_t>(value++);
InitializeCPUContextX86_64Fxsave(&context->fxsave, &value);
// mxcsr appears twice, and the two values should be aliased.
context->mx_csr = context->fxsave.mxcsr;
context->dr0 = value++;
context->dr1 = value++;
context->dr2 = value++;
context->dr3 = value++;
value += 2; // Minidumps don’t carry dr4 or dr5.
context->dr6 = value++;
context->dr7 = value++;
// Set these fields last, because they have no analogues in CPUContextX86_64.
context->p1_home = value++;
context->p2_home = value++;
context->p3_home = value++;
context->p4_home = value++;
context->p5_home = value++;
context->p6_home = value++;
context->ds = static_cast<uint16_t>(value++);
context->es = static_cast<uint16_t>(value++);
context->ss = static_cast<uint16_t>(value++);
for (size_t index = 0; index < std::size(context->vector_register); ++index) {
context->vector_register[index].lo = value++;
context->vector_register[index].hi = value++;
}
context->vector_control = value++;
context->debug_control = value++;
context->last_branch_to_rip = value++;
context->last_branch_from_rip = value++;
context->last_exception_to_rip = value++;
context->last_exception_from_rip = value++;
}
void InitializeMinidumpContextARM(MinidumpContextARM* context, uint32_t seed) {
if (seed == 0) {
memset(context, 0, sizeof(*context));
context->context_flags = kMinidumpContextARM;
return;
}
context->context_flags = kMinidumpContextARMAll;
uint32_t value = seed;
for (size_t index = 0; index < std::size(context->regs); ++index) {
context->regs[index] = value++;
}
context->fp = value++;
context->ip = value++;
context->ip = value++;
context->sp = value++;
context->lr = value++;
context->pc = value++;
context->cpsr = value++;
for (size_t index = 0; index < std::size(context->vfp); ++index) {
context->vfp[index] = value++;
}
context->fpscr = value++;
}
void InitializeMinidumpContextARM64(MinidumpContextARM64* context,
uint32_t seed) {
if (seed == 0) {
memset(context, 0, sizeof(*context));
context->context_flags = kMinidumpContextARM64;
return;
}
context->context_flags = kMinidumpContextARM64Full;
uint32_t value = seed;
for (size_t index = 0; index < std::size(context->regs); ++index) {
context->regs[index] = value++;
}
context->fp = value++;
context->lr = value++;
context->sp = value++;
context->pc = value++;
context->cpsr = value++;
for (size_t index = 0; index < std::size(context->fpsimd); ++index) {
context->fpsimd[index].lo = value++;
context->fpsimd[index].hi = value++;
}
context->fpsr = value++;
context->fpcr = value++;
}
void InitializeMinidumpContextMIPS(MinidumpContextMIPS* context,
uint32_t seed) {
if (seed == 0) {
memset(context, 0, sizeof(*context));
context->context_flags = kMinidumpContextMIPS;
return;
}
context->context_flags = kMinidumpContextMIPSAll;
uint32_t value = seed;
for (size_t index = 0; index < std::size(context->regs); ++index) {
context->regs[index] = value++;
}
context->mdlo = value++;
context->mdhi = value++;
context->epc = value++;
context->badvaddr = value++;
context->status = value++;
context->cause = value++;
for (size_t index = 0; index < std::size(context->fpregs.fregs); ++index) {
context->fpregs.fregs[index]._fp_fregs = static_cast<float>(value++);
}
context->fpcsr = value++;
context->fir = value++;
for (size_t index = 0; index < 3; ++index) {
context->hi[index] = value++;
context->lo[index] = value++;
}
context->dsp_control = value++;
}
void InitializeMinidumpContextMIPS64(MinidumpContextMIPS64* context,
uint32_t seed) {
if (seed == 0) {
memset(context, 0, sizeof(*context));
context->context_flags = kMinidumpContextMIPS64;
return;
}
context->context_flags = kMinidumpContextMIPS64All;
uint64_t value = seed;
for (size_t index = 0; index < std::size(context->regs); ++index) {
context->regs[index] = value++;
}
context->mdlo = value++;
context->mdhi = value++;
context->epc = value++;
context->badvaddr = value++;
context->status = value++;
context->cause = value++;
for (size_t index = 0; index < std::size(context->fpregs.dregs); ++index) {
context->fpregs.dregs[index] = static_cast<double>(value++);
}
context->fpcsr = value++;
context->fir = value++;
for (size_t index = 0; index < 3; ++index) {
context->hi[index] = value++;
context->lo[index] = value++;
}
context->dsp_control = value++;
}
namespace {
// Using Google Test assertions, compares |expected| to |observed|. This is
// templatized because the CPUContextX86::Fxsave and CPUContextX86_64::Fxsave
// are nearly identical but have different sizes for the members |xmm|,
// |reserved_4|, and |available|.
template <typename FxsaveType>
void ExpectMinidumpContextFxsave(const FxsaveType* expected,
const FxsaveType* observed) {
EXPECT_EQ(observed->fcw, expected->fcw);
EXPECT_EQ(observed->fsw, expected->fsw);
EXPECT_EQ(observed->ftw, expected->ftw);
EXPECT_EQ(observed->reserved_1, expected->reserved_1);
EXPECT_EQ(observed->fop, expected->fop);
EXPECT_EQ(observed->fpu_ip, expected->fpu_ip);
EXPECT_EQ(observed->fpu_cs, expected->fpu_cs);
EXPECT_EQ(observed->reserved_2, expected->reserved_2);
EXPECT_EQ(observed->fpu_dp, expected->fpu_dp);
EXPECT_EQ(observed->fpu_ds, expected->fpu_ds);
EXPECT_EQ(observed->reserved_3, expected->reserved_3);
EXPECT_EQ(observed->mxcsr, expected->mxcsr);
EXPECT_EQ(observed->mxcsr_mask, expected->mxcsr_mask);
for (size_t st_mm_index = 0; st_mm_index < std::size(expected->st_mm);
++st_mm_index) {
SCOPED_TRACE(base::StringPrintf("st_mm_index %" PRIuS, st_mm_index));
EXPECT_EQ(BytesToHexString(observed->st_mm[st_mm_index].st,
std::size(observed->st_mm[st_mm_index].st)),
BytesToHexString(expected->st_mm[st_mm_index].st,
std::size(expected->st_mm[st_mm_index].st)));
EXPECT_EQ(
BytesToHexString(observed->st_mm[st_mm_index].st_reserved,
std::size(observed->st_mm[st_mm_index].st_reserved)),
BytesToHexString(expected->st_mm[st_mm_index].st_reserved,
std::size(expected->st_mm[st_mm_index].st_reserved)));
}
for (size_t xmm_index = 0; xmm_index < std::size(expected->xmm);
++xmm_index) {
EXPECT_EQ(BytesToHexString(observed->xmm[xmm_index],
std::size(observed->xmm[xmm_index])),
BytesToHexString(expected->xmm[xmm_index],
std::size(expected->xmm[xmm_index])))
<< "xmm_index " << xmm_index;
}
EXPECT_EQ(
BytesToHexString(observed->reserved_4, std::size(observed->reserved_4)),
BytesToHexString(expected->reserved_4, std::size(expected->reserved_4)));
EXPECT_EQ(
BytesToHexString(observed->available, std::size(observed->available)),
BytesToHexString(expected->available, std::size(expected->available)));
}
} // namespace
void ExpectMinidumpContextX86(
uint32_t expect_seed, const MinidumpContextX86* observed, bool snapshot) {
MinidumpContextX86 expected;
InitializeMinidumpContextX86(&expected, expect_seed);
EXPECT_EQ(observed->context_flags, expected.context_flags);
EXPECT_EQ(observed->dr0, expected.dr0);
EXPECT_EQ(observed->dr1, expected.dr1);
EXPECT_EQ(observed->dr2, expected.dr2);
EXPECT_EQ(observed->dr3, expected.dr3);
EXPECT_EQ(observed->dr6, expected.dr6);
EXPECT_EQ(observed->dr7, expected.dr7);
EXPECT_EQ(observed->fsave.fcw, expected.fsave.fcw);
EXPECT_EQ(observed->fsave.fsw, expected.fsave.fsw);
EXPECT_EQ(observed->fsave.ftw, expected.fsave.ftw);
EXPECT_EQ(observed->fsave.fpu_ip, expected.fsave.fpu_ip);
EXPECT_EQ(observed->fsave.fpu_cs, expected.fsave.fpu_cs);
EXPECT_EQ(observed->fsave.fpu_dp, expected.fsave.fpu_dp);
EXPECT_EQ(observed->fsave.fpu_ds, expected.fsave.fpu_ds);
for (size_t index = 0; index < std::size(expected.fsave.st); ++index) {
EXPECT_EQ(BytesToHexString(observed->fsave.st[index],
std::size(observed->fsave.st[index])),
BytesToHexString(expected.fsave.st[index],
std::size(expected.fsave.st[index])))
<< "index " << index;
}
if (snapshot) {
EXPECT_EQ(observed->float_save.spare_0, 0u);
} else {
EXPECT_EQ(observed->float_save.spare_0, expected.float_save.spare_0);
}
EXPECT_EQ(observed->gs, expected.gs);
EXPECT_EQ(observed->fs, expected.fs);
EXPECT_EQ(observed->es, expected.es);
EXPECT_EQ(observed->ds, expected.ds);
EXPECT_EQ(observed->edi, expected.edi);
EXPECT_EQ(observed->esi, expected.esi);
EXPECT_EQ(observed->ebx, expected.ebx);
EXPECT_EQ(observed->edx, expected.edx);
EXPECT_EQ(observed->ecx, expected.ecx);
EXPECT_EQ(observed->eax, expected.eax);
EXPECT_EQ(observed->ebp, expected.ebp);
EXPECT_EQ(observed->eip, expected.eip);
EXPECT_EQ(observed->cs, expected.cs);
EXPECT_EQ(observed->eflags, expected.eflags);
EXPECT_EQ(observed->esp, expected.esp);
EXPECT_EQ(observed->ss, expected.ss);
ExpectMinidumpContextFxsave(&expected.fxsave, &observed->fxsave);
}
void ExpectMinidumpContextAMD64(
uint32_t expect_seed, const MinidumpContextAMD64* observed, bool snapshot) {
MinidumpContextAMD64 expected;
InitializeMinidumpContextAMD64(&expected, expect_seed);
// Allow context_flags to include xstate bit - this is added if we will write
// an extended context, but is not generated in the fixed context for testing.
if ((observed->context_flags & kMinidumpContextAMD64Xstate) ==
kMinidumpContextAMD64Xstate) {
EXPECT_EQ(observed->context_flags,
(expected.context_flags | kMinidumpContextAMD64Xstate));
} else {
EXPECT_EQ(observed->context_flags, expected.context_flags);
}
if (snapshot) {
EXPECT_EQ(observed->p1_home, 0u);
EXPECT_EQ(observed->p2_home, 0u);
EXPECT_EQ(observed->p3_home, 0u);
EXPECT_EQ(observed->p4_home, 0u);
EXPECT_EQ(observed->p5_home, 0u);
EXPECT_EQ(observed->p6_home, 0u);
} else {
EXPECT_EQ(observed->p1_home, expected.p1_home);
EXPECT_EQ(observed->p2_home, expected.p2_home);
EXPECT_EQ(observed->p3_home, expected.p3_home);
EXPECT_EQ(observed->p4_home, expected.p4_home);
EXPECT_EQ(observed->p5_home, expected.p5_home);
EXPECT_EQ(observed->p6_home, expected.p6_home);
}
EXPECT_EQ(observed->mx_csr, expected.mx_csr);
EXPECT_EQ(observed->cs, expected.cs);
if (snapshot) {
EXPECT_EQ(observed->ds, 0u);
EXPECT_EQ(observed->es, 0u);
} else {
EXPECT_EQ(observed->ds, expected.ds);
EXPECT_EQ(observed->es, expected.es);
}
EXPECT_EQ(observed->fs, expected.fs);
EXPECT_EQ(observed->gs, expected.gs);
if (snapshot) {
EXPECT_EQ(observed->ss, 0u);
} else {
EXPECT_EQ(observed->ss, expected.ss);
}
EXPECT_EQ(observed->eflags, expected.eflags);
EXPECT_EQ(observed->dr0, expected.dr0);
EXPECT_EQ(observed->dr1, expected.dr1);
EXPECT_EQ(observed->dr2, expected.dr2);
EXPECT_EQ(observed->dr3, expected.dr3);
EXPECT_EQ(observed->dr6, expected.dr6);
EXPECT_EQ(observed->dr7, expected.dr7);
EXPECT_EQ(observed->rax, expected.rax);
EXPECT_EQ(observed->rcx, expected.rcx);
EXPECT_EQ(observed->rdx, expected.rdx);
EXPECT_EQ(observed->rbx, expected.rbx);
EXPECT_EQ(observed->rsp, expected.rsp);
EXPECT_EQ(observed->rbp, expected.rbp);
EXPECT_EQ(observed->rsi, expected.rsi);
EXPECT_EQ(observed->rdi, expected.rdi);
EXPECT_EQ(observed->r8, expected.r8);
EXPECT_EQ(observed->r9, expected.r9);
EXPECT_EQ(observed->r10, expected.r10);
EXPECT_EQ(observed->r11, expected.r11);
EXPECT_EQ(observed->r12, expected.r12);
EXPECT_EQ(observed->r13, expected.r13);
EXPECT_EQ(observed->r14, expected.r14);
EXPECT_EQ(observed->r15, expected.r15);
EXPECT_EQ(observed->rip, expected.rip);
ExpectMinidumpContextFxsave(&expected.fxsave, &observed->fxsave);
for (size_t index = 0; index < std::size(expected.vector_register); ++index) {
if (snapshot) {
EXPECT_EQ(observed->vector_register[index].lo, 0u) << "index " << index;
EXPECT_EQ(observed->vector_register[index].hi, 0u) << "index " << index;
} else {
EXPECT_EQ(observed->vector_register[index].lo,
expected.vector_register[index].lo)
<< "index " << index;
EXPECT_EQ(observed->vector_register[index].hi,
expected.vector_register[index].hi)
<< "index " << index;
}
}
if (snapshot) {
EXPECT_EQ(observed->vector_control, 0u);
EXPECT_EQ(observed->debug_control, 0u);
EXPECT_EQ(observed->last_branch_to_rip, 0u);
EXPECT_EQ(observed->last_branch_from_rip, 0u);
EXPECT_EQ(observed->last_exception_to_rip, 0u);
EXPECT_EQ(observed->last_exception_from_rip, 0u);
} else {
EXPECT_EQ(observed->vector_control, expected.vector_control);
EXPECT_EQ(observed->debug_control, expected.debug_control);
EXPECT_EQ(observed->last_branch_to_rip, expected.last_branch_to_rip);
EXPECT_EQ(observed->last_branch_from_rip, expected.last_branch_from_rip);
EXPECT_EQ(observed->last_exception_to_rip, expected.last_exception_to_rip);
EXPECT_EQ(observed->last_exception_from_rip,
expected.last_exception_from_rip);
}
}
void ExpectMinidumpContextARM(uint32_t expect_seed,
const MinidumpContextARM* observed,
bool snapshot) {
MinidumpContextARM expected;
InitializeMinidumpContextARM(&expected, expect_seed);
EXPECT_EQ(observed->context_flags, expected.context_flags);
for (size_t index = 0; index < std::size(expected.regs); ++index) {
EXPECT_EQ(observed->regs[index], expected.regs[index]);
}
EXPECT_EQ(observed->fp, expected.fp);
EXPECT_EQ(observed->ip, expected.ip);
EXPECT_EQ(observed->sp, expected.sp);
EXPECT_EQ(observed->lr, expected.lr);
EXPECT_EQ(observed->pc, expected.pc);
EXPECT_EQ(observed->cpsr, expected.cpsr);
EXPECT_EQ(observed->fpscr, expected.fpscr);
for (size_t index = 0; index < std::size(expected.vfp); ++index) {
EXPECT_EQ(observed->vfp[index], expected.vfp[index]);
}
for (size_t index = 0; index < std::size(expected.extra); ++index) {
EXPECT_EQ(observed->extra[index], snapshot ? 0 : expected.extra[index]);
}
}
void ExpectMinidumpContextARM64(uint32_t expect_seed,
const MinidumpContextARM64* observed,
bool snapshot) {
MinidumpContextARM64 expected;
InitializeMinidumpContextARM64(&expected, expect_seed);
EXPECT_EQ(observed->context_flags, expected.context_flags);
for (size_t index = 0; index < std::size(expected.regs); ++index) {
EXPECT_EQ(observed->regs[index], expected.regs[index]);
}
EXPECT_EQ(observed->cpsr, expected.cpsr);
EXPECT_EQ(observed->fpsr, expected.fpsr);
EXPECT_EQ(observed->fpcr, expected.fpcr);
for (size_t index = 0; index < std::size(expected.fpsimd); ++index) {
EXPECT_EQ(observed->fpsimd[index].lo, expected.fpsimd[index].lo);
EXPECT_EQ(observed->fpsimd[index].hi, expected.fpsimd[index].hi);
}
}
void ExpectMinidumpContextMIPS(uint32_t expect_seed,
const MinidumpContextMIPS* observed,
bool snapshot) {
MinidumpContextMIPS expected;
InitializeMinidumpContextMIPS(&expected, expect_seed);
EXPECT_EQ(observed->context_flags, expected.context_flags);
for (size_t index = 0; index < std::size(expected.regs); ++index) {
EXPECT_EQ(observed->regs[index], expected.regs[index]);
}
EXPECT_EQ(observed->mdlo, expected.mdlo);
EXPECT_EQ(observed->mdhi, expected.mdhi);
EXPECT_EQ(observed->epc, expected.epc);
EXPECT_EQ(observed->badvaddr, expected.badvaddr);
EXPECT_EQ(observed->status, expected.status);
EXPECT_EQ(observed->cause, expected.cause);
for (size_t index = 0; index < std::size(expected.fpregs.fregs); ++index) {
EXPECT_EQ(observed->fpregs.fregs[index]._fp_fregs,
expected.fpregs.fregs[index]._fp_fregs);
}
EXPECT_EQ(observed->fpcsr, expected.fpcsr);
EXPECT_EQ(observed->fir, expected.fir);
for (size_t index = 0; index < 3; ++index) {
EXPECT_EQ(observed->hi[index], expected.hi[index]);
EXPECT_EQ(observed->lo[index], expected.lo[index]);
}
EXPECT_EQ(observed->dsp_control, expected.dsp_control);
}
void ExpectMinidumpContextMIPS64(uint32_t expect_seed,
const MinidumpContextMIPS64* observed,
bool snapshot) {
MinidumpContextMIPS64 expected;
InitializeMinidumpContextMIPS64(&expected, expect_seed);
EXPECT_EQ(observed->context_flags, expected.context_flags);
for (size_t index = 0; index < std::size(expected.regs); ++index) {
EXPECT_EQ(observed->regs[index], expected.regs[index]);
}
EXPECT_EQ(observed->mdlo, expected.mdlo);
EXPECT_EQ(observed->mdhi, expected.mdhi);
EXPECT_EQ(observed->epc, expected.epc);
EXPECT_EQ(observed->badvaddr, expected.badvaddr);
EXPECT_EQ(observed->status, expected.status);
EXPECT_EQ(observed->cause, expected.cause);
for (size_t index = 0; index < std::size(expected.fpregs.dregs); ++index) {
EXPECT_EQ(observed->fpregs.dregs[index], expected.fpregs.dregs[index]);
}
EXPECT_EQ(observed->fpcsr, expected.fpcsr);
EXPECT_EQ(observed->fir, expected.fir);
for (size_t index = 0; index < 3; ++index) {
EXPECT_EQ(observed->hi[index], expected.hi[index]);
EXPECT_EQ(observed->lo[index], expected.lo[index]);
}
EXPECT_EQ(observed->dsp_control, expected.dsp_control);
}
} // namespace test
} // namespace crashpad
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