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/*
* Copyright (c) 2016, Alliance for Open Media. All rights reserved
*
* This source code is subject to the terms of the BSD 2 Clause License and
* the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
* was not distributed with this source code in the LICENSE file, you can
* obtain it at www.aomedia.org/license/software. If the Alliance for Open
* Media Patent License 1.0 was not distributed with this source code in the
* PATENTS file, you can obtain it at www.aomedia.org/license/patent.
*/
#ifndef AOM_TEST_REGISTER_STATE_CHECK_H_
#define AOM_TEST_REGISTER_STATE_CHECK_H_
#include "third_party/googletest/src/googletest/include/gtest/gtest.h"
#include "config/aom_config.h"
#include "aom/aom_integer.h"
// ASM_REGISTER_STATE_CHECK(asm_function)
// Minimally validates the environment pre & post function execution. This
// variant should be used with assembly functions which are not expected to
// fully restore the system state. See platform implementations of
// RegisterStateCheck for details.
//
// API_REGISTER_STATE_CHECK(api_function)
// Performs all the checks done by ASM_REGISTER_STATE_CHECK() and any
// additional checks to ensure the environment is in a consistent state pre &
// post function execution. This variant should be used with API functions.
// See platform implementations of RegisterStateCheckXXX for details.
//
#if defined(_WIN64) && ARCH_X86_64
#undef NOMINMAX
#define NOMINMAX
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <winnt.h>
inline bool operator==(const M128A &lhs, const M128A &rhs) {
return (lhs.Low == rhs.Low && lhs.High == rhs.High);
}
namespace libaom_test {
// Compares the state of xmm[6-15] at construction with their state at
// destruction. These registers should be preserved by the callee on
// Windows x64.
class RegisterStateCheck {
public:
RegisterStateCheck() { initialized_ = StoreRegisters(&pre_context_); }
~RegisterStateCheck() { Check(); }
private:
static bool StoreRegisters(CONTEXT *const context) {
const HANDLE this_thread = GetCurrentThread();
EXPECT_TRUE(this_thread != NULL);
context->ContextFlags = CONTEXT_FLOATING_POINT;
const bool context_saved = GetThreadContext(this_thread, context) == TRUE;
EXPECT_TRUE(context_saved) << "GetLastError: " << GetLastError();
return context_saved;
}
// Compares the register state. Returns true if the states match.
void Check() const {
ASSERT_TRUE(initialized_);
CONTEXT post_context;
ASSERT_TRUE(StoreRegisters(&post_context));
const M128A *xmm_pre = &pre_context_.Xmm6;
const M128A *xmm_post = &post_context.Xmm6;
for (int i = 6; i <= 15; ++i) {
EXPECT_EQ(*xmm_pre, *xmm_post) << "xmm" << i << " has been modified!";
++xmm_pre;
++xmm_post;
}
}
bool initialized_;
CONTEXT pre_context_;
};
#define ASM_REGISTER_STATE_CHECK(statement) \
do { \
libaom_test::RegisterStateCheck reg_check; \
statement; \
} while (false)
} // namespace libaom_test
#else
namespace libaom_test {
class RegisterStateCheck {};
#define ASM_REGISTER_STATE_CHECK(statement) statement
} // namespace libaom_test
#endif // _WIN64 && ARCH_X86_64
#if ARCH_X86 || ARCH_X86_64
#if defined(__GNUC__)
namespace libaom_test {
// Checks the FPU tag word pre/post execution to ensure emms has been called.
class RegisterStateCheckMMX {
public:
RegisterStateCheckMMX() {
__asm__ volatile("fstenv %0" : "=rm"(pre_fpu_env_));
}
~RegisterStateCheckMMX() { Check(); }
private:
// Checks the FPU tag word pre/post execution, returning false if not cleared
// to 0xffff.
void Check() const {
EXPECT_EQ(0xffff, pre_fpu_env_[4])
<< "FPU was in an inconsistent state prior to call";
uint16_t post_fpu_env[14];
__asm__ volatile("fstenv %0" : "=rm"(post_fpu_env));
EXPECT_EQ(0xffff, post_fpu_env[4])
<< "FPU was left in an inconsistent state after call";
}
uint16_t pre_fpu_env_[14];
};
#define API_REGISTER_STATE_CHECK(statement) \
do { \
libaom_test::RegisterStateCheckMMX reg_check; \
ASM_REGISTER_STATE_CHECK(statement); \
} while (false)
} // namespace libaom_test
#endif // __GNUC__
#endif // ARCH_X86 || ARCH_X86_64
#ifndef API_REGISTER_STATE_CHECK
#define API_REGISTER_STATE_CHECK ASM_REGISTER_STATE_CHECK
#endif
#endif // AOM_TEST_REGISTER_STATE_CHECK_H_
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