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
|
// Copyright 2011 the V8 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.
#ifndef V8_MIPS_FRAMES_MIPS_H_
#define V8_MIPS_FRAMES_MIPS_H_
namespace v8 {
namespace internal {
// Register lists.
// Note that the bit values must match those used in actual instruction
// encoding.
const int kNumRegs = 32;
const RegList kJSCallerSaved =
1 << 2 | // v0
1 << 3 | // v1
1 << 4 | // a0
1 << 5 | // a1
1 << 6 | // a2
1 << 7 | // a3
1 << 8 | // a4
1 << 9 | // a5
1 << 10 | // a6
1 << 11 | // a7
1 << 12 | // t0
1 << 13 | // t1
1 << 14 | // t2
1 << 15; // t3
const int kNumJSCallerSaved = 14;
// Return the code of the n-th caller-saved register available to JavaScript
// e.g. JSCallerSavedReg(0) returns a0.code() == 4.
int JSCallerSavedCode(int n);
// Callee-saved registers preserved when switching from C to JavaScript.
const RegList kCalleeSaved =
1 << 16 | // s0
1 << 17 | // s1
1 << 18 | // s2
1 << 19 | // s3
1 << 20 | // s4
1 << 21 | // s5
1 << 22 | // s6 (roots in Javascript code)
1 << 23 | // s7 (cp in Javascript code)
1 << 30; // fp/s8
const int kNumCalleeSaved = 9;
const RegList kCalleeSavedFPU =
1 << 20 | // f20
1 << 22 | // f22
1 << 24 | // f24
1 << 26 | // f26
1 << 28 | // f28
1 << 30; // f30
const int kNumCalleeSavedFPU = 6;
const RegList kCallerSavedFPU =
1 << 0 | // f0
1 << 2 | // f2
1 << 4 | // f4
1 << 6 | // f6
1 << 8 | // f8
1 << 10 | // f10
1 << 12 | // f12
1 << 14 | // f14
1 << 16 | // f16
1 << 18; // f18
// Number of registers for which space is reserved in safepoints. Must be a
// multiple of 8.
const int kNumSafepointRegisters = 24;
// Define the list of registers actually saved at safepoints.
// Note that the number of saved registers may be smaller than the reserved
// space, i.e. kNumSafepointSavedRegisters <= kNumSafepointRegisters.
const RegList kSafepointSavedRegisters = kJSCallerSaved | kCalleeSaved;
const int kNumSafepointSavedRegisters =
kNumJSCallerSaved + kNumCalleeSaved;
const int kUndefIndex = -1;
// Map with indexes on stack that corresponds to codes of saved registers.
const int kSafepointRegisterStackIndexMap[kNumRegs] = {
kUndefIndex, // zero_reg
kUndefIndex, // at
0, // v0
1, // v1
2, // a0
3, // a1
4, // a2
5, // a3
6, // a4
7, // a5
8, // a6
9, // a7
10, // t0
11, // t1
12, // t2
13, // t3
14, // s0
15, // s1
16, // s2
17, // s3
18, // s4
19, // s5
20, // s6
21, // s7
kUndefIndex, // t8
kUndefIndex, // t9
kUndefIndex, // k0
kUndefIndex, // k1
kUndefIndex, // gp
kUndefIndex, // sp
22, // fp
kUndefIndex
};
// ----------------------------------------------------
class EntryFrameConstants : public AllStatic {
public:
static const int kCallerFPOffset =
-(StandardFrameConstants::kFixedFrameSizeFromFp + kPointerSize);
};
class ExitFrameConstants : public AllStatic {
public:
static const int kFrameSize = 2 * kPointerSize;
static const int kCodeOffset = -2 * kPointerSize;
static const int kSPOffset = -1 * kPointerSize;
// The caller fields are below the frame pointer on the stack.
static const int kCallerFPOffset = +0 * kPointerSize;
// The calling JS function is between FP and PC.
static const int kCallerPCOffset = +1 * kPointerSize;
// MIPS-specific: a pointer to the old sp to avoid unnecessary calculations.
static const int kCallerSPOffset = +2 * kPointerSize;
// FP-relative displacement of the caller's SP.
static const int kCallerSPDisplacement = +2 * kPointerSize;
static const int kConstantPoolOffset = 0; // Not used.
};
class JavaScriptFrameConstants : public AllStatic {
public:
// FP-relative.
static const int kLocal0Offset = StandardFrameConstants::kExpressionsOffset;
static const int kLastParameterOffset = +2 * kPointerSize;
static const int kFunctionOffset = StandardFrameConstants::kMarkerOffset;
// Caller SP-relative.
static const int kParam0Offset = -2 * kPointerSize;
static const int kReceiverOffset = -1 * kPointerSize;
};
} } // namespace v8::internal
#endif
|
