Repository navigation
Expand file tree
/
Copy pathFTLSaveRestore.cpp
More file actions
149 lines (121 loc) · 5.05 KB
/
Copy pathFTLSaveRestore.cpp
File metadata and controls
149 lines (121 loc) · 5.05 KB
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
/*
* Copyright (C) 2013, 2014 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "FTLSaveRestore.h"
#if ENABLE(FTL_JIT)
#include "FPRInfo.h"
#include "GPRInfo.h"
#include "MacroAssembler.h"
#include "RegisterSet.h"
namespace JSC { namespace FTL {
static size_t bytesForGPRs()
{
return MacroAssembler::numberOfRegisters() * sizeof(int64_t);
}
static size_t bytesForFPRs()
{
// FIXME: It might be worthwhile saving the full state of the FP registers, at some point.
// Right now we don't need this since we only do the save/restore just prior to OSR exit, and
// OSR exit will be guaranteed to only need the double portion of the FP registers.
return MacroAssembler::numberOfFPRegisters() * sizeof(double);
}
size_t requiredScratchMemorySizeInBytes()
{
return bytesForGPRs() + bytesForFPRs();
}
size_t offsetOfGPR(GPRReg reg)
{
return MacroAssembler::registerIndex(reg) * sizeof(int64_t);
}
size_t offsetOfFPR(FPRReg reg)
{
return bytesForGPRs() + MacroAssembler::fpRegisterIndex(reg) * sizeof(double);
}
size_t offsetOfReg(Reg reg)
{
if (reg.isGPR())
return offsetOfGPR(reg.gpr());
return offsetOfFPR(reg.fpr());
}
namespace {
struct Regs {
Regs()
{
special = RegisterSet::stackRegisters();
special.merge(RegisterSet::reservedHardwareRegisters());
first = MacroAssembler::firstRegister();
while (special.get(first))
first = MacroAssembler::nextRegister(first);
second = MacroAssembler::nextRegister(first);
while (special.get(second))
second = MacroAssembler::nextRegister(second);
}
RegisterSet special;
GPRReg first;
GPRReg second;
};
} // anonymous namespace
void saveAllRegisters(MacroAssembler& jit, char* scratchMemory)
{
Regs regs;
// Get the first register out of the way, so that we can use it as a pointer.
jit.poke64(regs.first, 0);
jit.move(MacroAssembler::TrustedImmPtr(scratchMemory), regs.first);
// Get all of the other GPRs out of the way.
for (MacroAssembler::RegisterID reg = regs.second; reg <= MacroAssembler::lastRegister(); reg = MacroAssembler::nextRegister(reg)) {
if (regs.special.get(reg))
continue;
jit.store64(reg, MacroAssembler::Address(regs.first, offsetOfGPR(reg)));
}
// Restore the first register into the second one and save it.
jit.peek64(regs.second, 0);
jit.store64(regs.second, MacroAssembler::Address(regs.first, offsetOfGPR(regs.first)));
// Finally save all FPR's.
for (MacroAssembler::FPRegisterID reg = MacroAssembler::firstFPRegister(); reg <= MacroAssembler::lastFPRegister(); reg = MacroAssembler::nextFPRegister(reg)) {
if (regs.special.get(reg))
continue;
jit.storeDouble(reg, MacroAssembler::Address(regs.first, offsetOfFPR(reg)));
}
}
void restoreAllRegisters(MacroAssembler& jit, char* scratchMemory)
{
Regs regs;
// Give ourselves a pointer to the scratch memory.
jit.move(MacroAssembler::TrustedImmPtr(scratchMemory), regs.first);
// Restore all FPR's.
for (MacroAssembler::FPRegisterID reg = MacroAssembler::firstFPRegister(); reg <= MacroAssembler::lastFPRegister(); reg = MacroAssembler::nextFPRegister(reg)) {
if (regs.special.get(reg))
continue;
jit.loadDouble(MacroAssembler::Address(regs.first, offsetOfFPR(reg)), reg);
}
for (MacroAssembler::RegisterID reg = regs.second; reg <= MacroAssembler::lastRegister(); reg = MacroAssembler::nextRegister(reg)) {
if (regs.special.get(reg))
continue;
jit.load64(MacroAssembler::Address(regs.first, offsetOfGPR(reg)), reg);
}
jit.load64(MacroAssembler::Address(regs.first, offsetOfGPR(regs.first)), regs.first);
}
} } // namespace JSC::FTL
#endif // ENABLE(FTL_JIT)