1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
|
/*
* 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 "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_
|
