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3 // modification, are permitted provided that the following conditions are
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5 //
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27
28 #ifndef V8_ARM_FRAMES_ARM_H_
29 #define V8_ARM_FRAMES_ARM_H_
30
31 namespace v8 {
32 namespace internal {
33
34
35 // The ARM ABI does not specify the usage of register r9, which may be reserved
36 // as the static base or thread register on some platforms, in which case we
37 // leave it alone. Adjust the value of kR9Available accordingly:
38 const int kR9Available = 1; // 1 if available to us, 0 if reserved
39
40
41 // Register list in load/store instructions
42 // Note that the bit values must match those used in actual instruction encoding
43 const int kNumRegs = 16;
44
45
46 // Caller-saved/arguments registers
47 const RegList kJSCallerSaved =
48 1 << 0 | // r0 a1
49 1 << 1 | // r1 a2
50 1 << 2 | // r2 a3
51 1 << 3; // r3 a4
52
53 const int kNumJSCallerSaved = 4;
54
55 typedef Object* JSCallerSavedBuffer[kNumJSCallerSaved];
56
57 // Return the code of the n-th caller-saved register available to JavaScript
58 // e.g. JSCallerSavedReg(0) returns r0.code() == 0
59 int JSCallerSavedCode(int n);
60
61
62 // Callee-saved registers preserved when switching from C to JavaScript
63 const RegList kCalleeSaved =
64 1 << 4 | // r4 v1
65 1 << 5 | // r5 v2
66 1 << 6 | // r6 v3
67 1 << 7 | // r7 v4 (cp in JavaScript code)
68 1 << 8 | // r8 v5 (pp in JavaScript code)
69 kR9Available << 9 | // r9 v6
70 1 << 10 | // r10 v7
71 1 << 11; // r11 v8 (fp in JavaScript code)
72
73 // When calling into C++ (only for C++ calls that can't cause a GC).
74 // The call code will take care of lr, fp, etc.
75 const RegList kCallerSaved =
76 1 << 0 | // r0
77 1 << 1 | // r1
78 1 << 2 | // r2
79 1 << 3 | // r3
80 1 << 9; // r9
81
82
83 const int kNumCalleeSaved = 7 + kR9Available;
84
85 // Double registers d8 to d15 are callee-saved.
86 const int kNumDoubleCalleeSaved = 8;
87
88
89 // Number of registers for which space is reserved in safepoints. Must be a
90 // multiple of 8.
91 // TODO(regis): Only 8 registers may actually be sufficient. Revisit.
92 const int kNumSafepointRegisters = 16;
93
94 // Define the list of registers actually saved at safepoints.
95 // Note that the number of saved registers may be smaller than the reserved
96 // space, i.e. kNumSafepointSavedRegisters <= kNumSafepointRegisters.
97 const RegList kSafepointSavedRegisters = kJSCallerSaved | kCalleeSaved;
98 const int kNumSafepointSavedRegisters = kNumJSCallerSaved + kNumCalleeSaved;
99
100 // ----------------------------------------------------
101
102
103 class EntryFrameConstants : public AllStatic {
104 public:
105 static const int kCallerFPOffset =
106 -(StandardFrameConstants::kFixedFrameSizeFromFp + kPointerSize);
107 };
108
109
110 class ExitFrameConstants : public AllStatic {
111 public:
112 static const int kCodeOffset = -2 * kPointerSize;
113 static const int kSPOffset = -1 * kPointerSize;
114
115 // The caller fields are below the frame pointer on the stack.
116 static const int kCallerFPOffset = 0 * kPointerSize;
117 // The calling JS function is below FP.
118 static const int kCallerPCOffset = 1 * kPointerSize;
119
120 // FP-relative displacement of the caller's SP. It points just
121 // below the saved PC.
122 static const int kCallerSPDisplacement = 2 * kPointerSize;
123 };
124
125
126 class JavaScriptFrameConstants : public AllStatic {
127 public:
128 // FP-relative.
129 static const int kLocal0Offset = StandardFrameConstants::kExpressionsOffset;
130 static const int kLastParameterOffset = +2 * kPointerSize;
131 static const int kFunctionOffset = StandardFrameConstants::kMarkerOffset;
132
133 // Caller SP-relative.
134 static const int kParam0Offset = -2 * kPointerSize;
135 static const int kReceiverOffset = -1 * kPointerSize;
136 };
137
138
139 class ArgumentsAdaptorFrameConstants : public AllStatic {
140 public:
141 // FP-relative.
142 static const int kLengthOffset = StandardFrameConstants::kExpressionsOffset;
143
144 static const int kFrameSize =
145 StandardFrameConstants::kFixedFrameSize + kPointerSize;
146 };
147
148
149 class ConstructFrameConstants : public AllStatic {
150 public:
151 // FP-relative.
152 static const int kImplicitReceiverOffset = -6 * kPointerSize;
153 static const int kConstructorOffset = -5 * kPointerSize;
154 static const int kLengthOffset = -4 * kPointerSize;
155 static const int kCodeOffset = StandardFrameConstants::kExpressionsOffset;
156
157 static const int kFrameSize =
158 StandardFrameConstants::kFixedFrameSize + 4 * kPointerSize;
159 };
160
161
162 class InternalFrameConstants : public AllStatic {
163 public:
164 // FP-relative.
165 static const int kCodeOffset = StandardFrameConstants::kExpressionsOffset;
166 };
167
168
function_slot_object()169 inline Object* JavaScriptFrame::function_slot_object() const {
170 const int offset = JavaScriptFrameConstants::kFunctionOffset;
171 return Memory::Object_at(fp() + offset);
172 }
173
174
SetFp(Address slot,Address fp)175 inline void StackHandler::SetFp(Address slot, Address fp) {
176 Memory::Address_at(slot) = fp;
177 }
178
179
180 } } // namespace v8::internal
181
182 #endif // V8_ARM_FRAMES_ARM_H_
183