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/*
* Copyright (c) 2012 The WebM project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#ifndef VPX_TEST_REGISTER_STATE_CHECK_H_
#define VPX_TEST_REGISTER_STATE_CHECK_H_
#include "third_party/googletest/src/include/gtest/gtest.h"
#include "./vpx_config.h"
#include "vpx/vpx_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) && VPX_ARCH_X86_64
#undef NOMINMAX
#define NOMINMAX
#ifndef WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN
#endif
#include <intrin.h>
#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 libvpx_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_NE(this_thread, nullptr);
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 { \
{ \
libvpx_test::RegisterStateCheck reg_check; \
statement; \
} \
_ReadWriteBarrier(); \
} while (false)
} // namespace libvpx_test
#elif defined(CONFIG_SHARED) && defined(HAVE_NEON_ASM) && \
defined(CONFIG_VP9) && !CONFIG_SHARED && HAVE_NEON_ASM && CONFIG_VP9
extern "C" {
// Save the d8-d15 registers into store.
void vpx_push_neon(int64_t *store);
}
namespace libvpx_test {
// Compares the state of d8-d15 at construction with their state at
// destruction. These registers should be preserved by the callee on
// arm platform.
class RegisterStateCheck {
public:
RegisterStateCheck() { vpx_push_neon(pre_store_); }
~RegisterStateCheck() { Check(); }
private:
// Compares the register state. Returns true if the states match.
void Check() const {
int64_t post_store[8];
vpx_push_neon(post_store);
for (int i = 0; i < 8; ++i) {
EXPECT_EQ(pre_store_[i], post_store[i])
<< "d" << i + 8 << " has been modified";
}
}
int64_t pre_store_[8];
};
#if defined(__GNUC__)
#define ASM_REGISTER_STATE_CHECK(statement) \
do { \
{ \
libvpx_test::RegisterStateCheck reg_check; \
statement; \
} \
__asm__ volatile("" ::: "memory"); \
} while (false)
#else
#define ASM_REGISTER_STATE_CHECK(statement) \
do { \
libvpx_test::RegisterStateCheck reg_check; \
statement; \
} while (false)
#endif
} // namespace libvpx_test
#else
namespace libvpx_test {
class RegisterStateCheck {};
#define ASM_REGISTER_STATE_CHECK(statement) statement
} // namespace libvpx_test
#endif // _WIN64 && VPX_ARCH_X86_64
#if VPX_ARCH_X86 || VPX_ARCH_X86_64
#if defined(__GNUC__)
namespace libvpx_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 { \
{ \
libvpx_test::RegisterStateCheckMMX reg_check_mmx; \
ASM_REGISTER_STATE_CHECK(statement); \
} \
__asm__ volatile("" ::: "memory"); \
} while (false)
} // namespace libvpx_test
#endif // __GNUC__
#endif // VPX_ARCH_X86 || VPX_ARCH_X86_64
#ifndef API_REGISTER_STATE_CHECK
#define API_REGISTER_STATE_CHECK ASM_REGISTER_STATE_CHECK
#endif
#endif // VPX_TEST_REGISTER_STATE_CHECK_H_
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