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1 // Copyright 2012 the V8 project authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4 
5 #ifndef V8_X87_FRAMES_X87_H_
6 #define V8_X87_FRAMES_X87_H_
7 
8 namespace v8 {
9 namespace internal {
10 
11 
12 // Register lists
13 // Note that the bit values must match those used in actual instruction encoding
14 const int kNumRegs = 8;
15 
16 
17 // Caller-saved registers
18 const RegList kJSCallerSaved =
19   1 << 0 |  // eax
20   1 << 1 |  // ecx
21   1 << 2 |  // edx
22   1 << 3 |  // ebx - used as a caller-saved register in JavaScript code
23   1 << 7;   // edi - callee function
24 
25 const int kNumJSCallerSaved = 5;
26 
27 
28 // Number of registers for which space is reserved in safepoints.
29 const int kNumSafepointRegisters = 8;
30 
31 const int kNoAlignmentPadding = 0;
32 const int kAlignmentPaddingPushed = 2;
33 const int kAlignmentZapValue = 0x12345678;  // Not heap object tagged.
34 
35 // ----------------------------------------------------
36 
37 
38 class EntryFrameConstants : public AllStatic {
39  public:
40   static const int kCallerFPOffset      = -6 * kPointerSize;
41 
42   static const int kNewTargetArgOffset = +2 * kPointerSize;
43   static const int kFunctionArgOffset   = +3 * kPointerSize;
44   static const int kReceiverArgOffset   = +4 * kPointerSize;
45   static const int kArgcOffset          = +5 * kPointerSize;
46   static const int kArgvOffset          = +6 * kPointerSize;
47 };
48 
49 
50 class ExitFrameConstants : public AllStatic {
51  public:
52   static const int kFrameSize      = 2 * kPointerSize;
53 
54   static const int kCodeOffset     = -2 * kPointerSize;
55   static const int kSPOffset       = -1 * kPointerSize;
56 
57   static const int kCallerFPOffset =  0 * kPointerSize;
58   static const int kCallerPCOffset = +1 * kPointerSize;
59 
60   // FP-relative displacement of the caller's SP.  It points just
61   // below the saved PC.
62   static const int kCallerSPDisplacement = +2 * kPointerSize;
63 
64   static const int kConstantPoolOffset   = 0;  // Not used
65 };
66 
67 
68 class JavaScriptFrameConstants : public AllStatic {
69  public:
70   // FP-relative.
71   static const int kLocal0Offset = StandardFrameConstants::kExpressionsOffset;
72   static const int kLastParameterOffset = +2 * kPointerSize;
73   static const int kFunctionOffset = StandardFrameConstants::kMarkerOffset;
74 
75   // Caller SP-relative.
76   static const int kParam0Offset   = -2 * kPointerSize;
77   static const int kReceiverOffset = -1 * kPointerSize;
78 
79   static const int kDynamicAlignmentStateOffset = kLocal0Offset;
80 };
81 
82 
83 }  // namespace internal
84 }  // namespace v8
85 
86 #endif  // V8_X87_FRAMES_X87_H_
87