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Copied from the _linux implementation, which looks close to what ucontext on Fuchsia is (though it will probably need to change). In arm64 debug, CaptureContext.CaptureContext requires slightly longer slop distance. Bug: crashpad:196 Change-Id: I2a6f90095e06fe8b468fbfd8add66a73c8a1d92f Reviewed-on: https://chromium-review.googlesource.com/1031091 Reviewed-by: Joshua Peraza <jperaza@chromium.org> Commit-Queue: Scott Graham <scottmg@chromium.org>
105 lines
3.7 KiB
C++
105 lines
3.7 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 "util/misc/capture_context.h"
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#include <stdint.h>
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#include <algorithm>
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#include "gtest/gtest.h"
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#include "util/misc/address_sanitizer.h"
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#include "util/misc/capture_context_test_util.h"
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namespace crashpad {
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namespace test {
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namespace {
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#if defined(OS_FUCHSIA)
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// Fuchsia uses -fsanitize=safe-stack by default, which splits local variables
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// and the call stack into separate regions (see
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// https://clang.llvm.org/docs/SafeStack.html). Because this test would like to
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// find an approximately valid stack pointer by comparing locals to the
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// captured one, disable safe-stack for this function.
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__attribute__((no_sanitize("safe-stack")))
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#endif
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void TestCaptureContext() {
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NativeCPUContext context_1;
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CaptureContext(&context_1);
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{
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SCOPED_TRACE("context_1");
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ASSERT_NO_FATAL_FAILURE(SanityCheckContext(context_1));
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}
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// The program counter reference value is this function’s address. The
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// captured program counter should be slightly greater than or equal to the
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// reference program counter.
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uintptr_t pc = ProgramCounterFromContext(context_1);
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#if !defined(ADDRESS_SANITIZER)
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// AddressSanitizer can cause enough code bloat that the “nearby” check would
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// likely fail.
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const uintptr_t kReferencePC =
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reinterpret_cast<uintptr_t>(TestCaptureContext);
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EXPECT_PRED2([](uintptr_t actual,
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uintptr_t reference) { return actual - reference < 64u; },
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pc,
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kReferencePC);
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#endif // !defined(ADDRESS_SANITIZER)
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// Declare sp and context_2 here because all local variables need to be
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// declared before computing the stack pointer reference value, so that the
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// reference value can be the lowest value possible.
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uintptr_t sp;
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NativeCPUContext context_2;
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// The stack pointer reference value is the lowest address of a local variable
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// in this function. The captured program counter will be slightly less than
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// or equal to the reference stack pointer.
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const uintptr_t kReferenceSP =
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std::min(std::min(reinterpret_cast<uintptr_t>(&context_1),
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reinterpret_cast<uintptr_t>(&context_2)),
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std::min(reinterpret_cast<uintptr_t>(&pc),
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reinterpret_cast<uintptr_t>(&sp)));
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sp = StackPointerFromContext(context_1);
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EXPECT_PRED2([](uintptr_t actual,
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uintptr_t reference) { return reference - actual < 768u; },
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sp,
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kReferenceSP);
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// Capture the context again, expecting that the stack pointer stays the same
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// and the program counter increases. Strictly speaking, there’s no guarantee
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// that these conditions will hold, although they do for known compilers even
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// under typical optimization.
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CaptureContext(&context_2);
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{
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SCOPED_TRACE("context_2");
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ASSERT_NO_FATAL_FAILURE(SanityCheckContext(context_2));
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}
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EXPECT_EQ(StackPointerFromContext(context_2), sp);
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EXPECT_GT(ProgramCounterFromContext(context_2), pc);
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}
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TEST(CaptureContext, CaptureContext) {
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ASSERT_NO_FATAL_FAILURE(TestCaptureContext());
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}
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} // namespace
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} // namespace test
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} // namespace crashpad
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