1 // Copyright 2006-2008 the V8 project authors. All rights reserved.
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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 static 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 static const int kNumRegs = 16;
44
45
46 // Caller-saved/arguments registers
47 static 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 static 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 static const RegList kCalleeSaved =
64 1 << 4 | // r4 v1
65 1 << 5 | // r5 v2
66 1 << 6 | // r6 v3
67 1 << 7 | // r7 v4
68 1 << 8 | // r8 v5 (cp in JavaScript code)
69 kR9Available
70 << 9 | // r9 v6
71 1 << 10 | // r10 v7
72 1 << 11; // r11 v8 (fp in JavaScript code)
73
74 static const int kNumCalleeSaved = 7 + kR9Available;
75
76
77 // ----------------------------------------------------
78
79
80 class StackHandlerConstants : public AllStatic {
81 public:
82 static const int kNextOffset = 0 * kPointerSize;
83 static const int kStateOffset = 1 * kPointerSize;
84 static const int kFPOffset = 2 * kPointerSize;
85 static const int kPCOffset = 3 * kPointerSize;
86
87 static const int kSize = kPCOffset + kPointerSize;
88 };
89
90
91 class EntryFrameConstants : public AllStatic {
92 public:
93 static const int kCallerFPOffset = -3 * kPointerSize;
94 };
95
96
97 class ExitFrameConstants : public AllStatic {
98 public:
99 // Exit frames have a debug marker on the stack.
100 static const int kSPDisplacement = -1 * kPointerSize;
101
102 // The debug marker is just above the frame pointer.
103 static const int kCodeOffset = -1 * kPointerSize;
104
105 static const int kSavedRegistersOffset = 0 * kPointerSize;
106
107 // The caller fields are below the frame pointer on the stack.
108 static const int kCallerFPOffset = +0 * kPointerSize;
109 // The calling JS function is between FP and PC.
110 static const int kCallerPCOffset = +2 * kPointerSize;
111
112 // FP-relative displacement of the caller's SP. It points just
113 // below the saved PC.
114 static const int kCallerSPDisplacement = +3 * kPointerSize;
115 };
116
117
118 class StandardFrameConstants : public AllStatic {
119 public:
120 static const int kExpressionsOffset = -3 * kPointerSize;
121 static const int kMarkerOffset = -2 * kPointerSize;
122 static const int kContextOffset = -1 * kPointerSize;
123 static const int kCallerFPOffset = 0 * kPointerSize;
124 static const int kCallerPCOffset = +1 * kPointerSize;
125 static const int kCallerSPOffset = +2 * kPointerSize;
126 };
127
128
129 class JavaScriptFrameConstants : public AllStatic {
130 public:
131 // FP-relative.
132 static const int kLocal0Offset = StandardFrameConstants::kExpressionsOffset;
133 static const int kSavedRegistersOffset = +2 * kPointerSize;
134 static const int kFunctionOffset = StandardFrameConstants::kMarkerOffset;
135
136 // Caller SP-relative.
137 static const int kParam0Offset = -2 * kPointerSize;
138 static const int kReceiverOffset = -1 * kPointerSize;
139 };
140
141
142 class ArgumentsAdaptorFrameConstants : public AllStatic {
143 public:
144 static const int kLengthOffset = StandardFrameConstants::kExpressionsOffset;
145 };
146
147
148 class InternalFrameConstants : public AllStatic {
149 public:
150 static const int kCodeOffset = StandardFrameConstants::kExpressionsOffset;
151 };
152
153
function_slot_object()154 inline Object* JavaScriptFrame::function_slot_object() const {
155 const int offset = JavaScriptFrameConstants::kFunctionOffset;
156 return Memory::Object_at(fp() + offset);
157 }
158
159
160 } } // namespace v8::internal
161
162 #endif // V8_ARM_FRAMES_ARM_H_
163