1// Copyright 2010 the V8 project authors. All rights reserved.
2// Redistribution and use in source and binary forms, with or without
3// modification, are permitted provided that the following conditions are
4// met:
5//
6//     * Redistributions of source code must retain the above copyright
7//       notice, this list of conditions and the following disclaimer.
8//     * Redistributions in binary form must reproduce the above
9//       copyright notice, this list of conditions and the following
10//       disclaimer in the documentation and/or other materials provided
11//       with the distribution.
12//     * Neither the name of Google Inc. nor the names of its
13//       contributors may be used to endorse or promote products derived
14//       from this software without specific prior written permission.
15//
16// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27
28
29
30#ifndef V8_MIPS_FRAMES_MIPS_H_
31#define V8_MIPS_FRAMES_MIPS_H_
32
33
34namespace v8 {
35namespace internal {
36
37// Register lists.
38// Note that the bit values must match those used in actual instruction
39// encoding.
40static const int kNumRegs = 32;
41
42static const RegList kJSCallerSaved =
43  1 << 4 |  // a0
44  1 << 5 |  // a1
45  1 << 6 |  // a2
46  1 << 7;   // a3
47
48static const int kNumJSCallerSaved = 4;
49
50
51// Return the code of the n-th caller-saved register available to JavaScript
52// e.g. JSCallerSavedReg(0) returns r0.code() == 0.
53int JSCallerSavedCode(int n);
54
55
56// Callee-saved registers preserved when switching from C to JavaScript.
57static const RegList kCalleeSaved =
58  // Saved temporaries.
59  1 << 16 | 1 << 17 | 1 << 18 | 1 << 19 |
60  1 << 20 | 1 << 21 | 1 << 22 | 1 << 23 |
61  // gp, sp, fp
62  1 << 28 | 1 << 29 | 1 << 30;
63
64static const int kNumCalleeSaved = 11;
65
66
67typedef Object* JSCallerSavedBuffer[kNumJSCallerSaved];
68
69
70// ----------------------------------------------------
71
72class StackHandlerConstants : public AllStatic {
73 public:
74  static const int kNextOffset  = 0 * kPointerSize;
75  static const int kStateOffset = 1 * kPointerSize;
76  static const int kFPOffset    = 2 * kPointerSize;
77  static const int kPCOffset    = 3 * kPointerSize;
78
79  static const int kSize = kPCOffset + kPointerSize;
80};
81
82
83class EntryFrameConstants : public AllStatic {
84 public:
85  static const int kCallerFPOffset      = -3 * kPointerSize;
86};
87
88
89class ExitFrameConstants : public AllStatic {
90 public:
91  // Exit frames have a debug marker on the stack.
92  static const int kSPDisplacement = -1 * kPointerSize;
93
94  // The debug marker is just above the frame pointer.
95  static const int kDebugMarkOffset = -1 * kPointerSize;
96  // Must be the same as kDebugMarkOffset. Alias introduced when upgrading.
97  static const int kCodeOffset = -1 * kPointerSize;
98
99  static const int kSavedRegistersOffset = 0 * kPointerSize;
100
101  // The caller fields are below the frame pointer on the stack.
102  static const int kCallerFPOffset = +0 * kPointerSize;
103  // The calling JS function is between FP and PC.
104  static const int kCallerPCOffset = +1 * kPointerSize;
105
106  // FP-relative displacement of the caller's SP.
107  static const int kCallerSPDisplacement = +4 * kPointerSize;
108};
109
110
111class StandardFrameConstants : public AllStatic {
112 public:
113  static const int kExpressionsOffset = -3 * kPointerSize;
114  static const int kMarkerOffset      = -2 * kPointerSize;
115  static const int kContextOffset     = -1 * kPointerSize;
116  static const int kCallerFPOffset    =  0 * kPointerSize;
117  static const int kCallerPCOffset    = +1 * kPointerSize;
118  static const int kCallerSPOffset    = +2 * kPointerSize;
119
120  // Size of the MIPS 4 32-bit argument slots.
121  // This is just an alias with a shorter name. Use it from now on.
122  static const int kRArgsSlotsSize = 4 * kPointerSize;
123  static const int kRegularArgsSlotsSize = kRArgsSlotsSize;
124
125  // C/C++ argument slots size.
126  static const int kCArgsSlotsSize = 4 * kPointerSize;
127  // JS argument slots size.
128  static const int kJSArgsSlotsSize = 0 * kPointerSize;
129};
130
131
132class JavaScriptFrameConstants : public AllStatic {
133 public:
134  // FP-relative.
135  static const int kLocal0Offset = StandardFrameConstants::kExpressionsOffset;
136  static const int kSavedRegistersOffset = +2 * kPointerSize;
137  static const int kFunctionOffset = StandardFrameConstants::kMarkerOffset;
138
139  // Caller SP-relative.
140  static const int kParam0Offset   = -2 * kPointerSize;
141  static const int kReceiverOffset = -1 * kPointerSize;
142};
143
144
145class ArgumentsAdaptorFrameConstants : public AllStatic {
146 public:
147  static const int kLengthOffset = StandardFrameConstants::kExpressionsOffset;
148};
149
150
151class InternalFrameConstants : public AllStatic {
152 public:
153  static const int kCodeOffset = StandardFrameConstants::kExpressionsOffset;
154};
155
156
157inline Object* JavaScriptFrame::function_slot_object() const {
158  const int offset = JavaScriptFrameConstants::kFunctionOffset;
159  return Memory::Object_at(fp() + offset);
160}
161
162} }  // namespace v8::internal
163
164#endif
165