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| 1 // Copyright 2011 the V8 project authors. All rights reserved. | 1 // Copyright 2011 the V8 project authors. All rights reserved. |
| 2 // Redistribution and use in source and binary forms, with or without | 2 // Redistribution and use in source and binary forms, with or without |
| 3 // modification, are permitted provided that the following conditions are | 3 // modification, are permitted provided that the following conditions are |
| 4 // met: | 4 // met: |
| 5 // | 5 // |
| 6 // * Redistributions of source code must retain the above copyright | 6 // * Redistributions of source code must retain the above copyright |
| 7 // notice, this list of conditions and the following disclaimer. | 7 // notice, this list of conditions and the following disclaimer. |
| 8 // * Redistributions in binary form must reproduce the above | 8 // * Redistributions in binary form must reproduce the above |
| 9 // copyright notice, this list of conditions and the following | 9 // copyright notice, this list of conditions and the following |
| 10 // disclaimer in the documentation and/or other materials provided | 10 // disclaimer in the documentation and/or other materials provided |
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| 28 #ifndef V8_ARM_FRAMES_ARM_H_ | 28 #ifndef V8_ARM_FRAMES_ARM_H_ |
| 29 #define V8_ARM_FRAMES_ARM_H_ | 29 #define V8_ARM_FRAMES_ARM_H_ |
| 30 | 30 |
| 31 namespace v8 { | 31 namespace v8 { |
| 32 namespace internal { | 32 namespace internal { |
| 33 | 33 |
| 34 | 34 |
| 35 // The ARM ABI does not specify the usage of register r9, which may be reserved | 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 | 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: | 37 // leave it alone. Adjust the value of kR9Available accordingly: |
| 38 static const int kR9Available = 1; // 1 if available to us, 0 if reserved | 38 const int kR9Available = 1; // 1 if available to us, 0 if reserved |
| 39 | 39 |
| 40 | 40 |
| 41 // Register list in load/store instructions | 41 // Register list in load/store instructions |
| 42 // Note that the bit values must match those used in actual instruction encoding | 42 // Note that the bit values must match those used in actual instruction encoding |
| 43 static const int kNumRegs = 16; | 43 const int kNumRegs = 16; |
| 44 | 44 |
| 45 | 45 |
| 46 // Caller-saved/arguments registers | 46 // Caller-saved/arguments registers |
| 47 static const RegList kJSCallerSaved = | 47 const RegList kJSCallerSaved = |
| 48 1 << 0 | // r0 a1 | 48 1 << 0 | // r0 a1 |
| 49 1 << 1 | // r1 a2 | 49 1 << 1 | // r1 a2 |
| 50 1 << 2 | // r2 a3 | 50 1 << 2 | // r2 a3 |
| 51 1 << 3; // r3 a4 | 51 1 << 3; // r3 a4 |
| 52 | 52 |
| 53 static const int kNumJSCallerSaved = 4; | 53 const int kNumJSCallerSaved = 4; |
| 54 | 54 |
| 55 typedef Object* JSCallerSavedBuffer[kNumJSCallerSaved]; | 55 typedef Object* JSCallerSavedBuffer[kNumJSCallerSaved]; |
| 56 | 56 |
| 57 // Return the code of the n-th caller-saved register available to JavaScript | 57 // Return the code of the n-th caller-saved register available to JavaScript |
| 58 // e.g. JSCallerSavedReg(0) returns r0.code() == 0 | 58 // e.g. JSCallerSavedReg(0) returns r0.code() == 0 |
| 59 int JSCallerSavedCode(int n); | 59 int JSCallerSavedCode(int n); |
| 60 | 60 |
| 61 | 61 |
| 62 // Callee-saved registers preserved when switching from C to JavaScript | 62 // Callee-saved registers preserved when switching from C to JavaScript |
| 63 static const RegList kCalleeSaved = | 63 const RegList kCalleeSaved = |
| 64 1 << 4 | // r4 v1 | 64 1 << 4 | // r4 v1 |
| 65 1 << 5 | // r5 v2 | 65 1 << 5 | // r5 v2 |
| 66 1 << 6 | // r6 v3 | 66 1 << 6 | // r6 v3 |
| 67 1 << 7 | // r7 v4 | 67 1 << 7 | // r7 v4 |
| 68 1 << 8 | // r8 v5 (cp in JavaScript code) | 68 1 << 8 | // r8 v5 (cp in JavaScript code) |
| 69 kR9Available << 9 | // r9 v6 | 69 kR9Available << 9 | // r9 v6 |
| 70 1 << 10 | // r10 v7 | 70 1 << 10 | // r10 v7 |
| 71 1 << 11; // r11 v8 (fp in JavaScript code) | 71 1 << 11; // r11 v8 (fp in JavaScript code) |
| 72 | 72 |
| 73 // When calling into C++ (only for C++ calls that can't cause a GC). | 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. | 74 // The call code will take care of lr, fp, etc. |
| 75 static const RegList kCallerSaved = | 75 const RegList kCallerSaved = |
| 76 1 << 0 | // r0 | 76 1 << 0 | // r0 |
| 77 1 << 1 | // r1 | 77 1 << 1 | // r1 |
| 78 1 << 2 | // r2 | 78 1 << 2 | // r2 |
| 79 1 << 3 | // r3 | 79 1 << 3 | // r3 |
| 80 1 << 9; // r9 | 80 1 << 9; // r9 |
| 81 | 81 |
| 82 | 82 |
| 83 static const int kNumCalleeSaved = 7 + kR9Available; | 83 const int kNumCalleeSaved = 7 + kR9Available; |
| 84 | 84 |
| 85 // Double registers d8 to d15 are callee-saved. | 85 // Double registers d8 to d15 are callee-saved. |
| 86 static const int kNumDoubleCalleeSaved = 8; | 86 const int kNumDoubleCalleeSaved = 8; |
| 87 | 87 |
| 88 | 88 |
| 89 // Number of registers for which space is reserved in safepoints. Must be a | 89 // Number of registers for which space is reserved in safepoints. Must be a |
| 90 // multiple of 8. | 90 // multiple of 8. |
| 91 // TODO(regis): Only 8 registers may actually be sufficient. Revisit. | 91 // TODO(regis): Only 8 registers may actually be sufficient. Revisit. |
| 92 static const int kNumSafepointRegisters = 16; | 92 const int kNumSafepointRegisters = 16; |
| 93 | 93 |
| 94 // Define the list of registers actually saved at safepoints. | 94 // Define the list of registers actually saved at safepoints. |
| 95 // Note that the number of saved registers may be smaller than the reserved | 95 // Note that the number of saved registers may be smaller than the reserved |
| 96 // space, i.e. kNumSafepointSavedRegisters <= kNumSafepointRegisters. | 96 // space, i.e. kNumSafepointSavedRegisters <= kNumSafepointRegisters. |
| 97 static const RegList kSafepointSavedRegisters = kJSCallerSaved | kCalleeSaved; | 97 const RegList kSafepointSavedRegisters = kJSCallerSaved | kCalleeSaved; |
| 98 static const int kNumSafepointSavedRegisters = | 98 const int kNumSafepointSavedRegisters = kNumJSCallerSaved + kNumCalleeSaved; |
| 99 kNumJSCallerSaved + kNumCalleeSaved; | |
| 100 | 99 |
| 101 // ---------------------------------------------------- | 100 // ---------------------------------------------------- |
| 102 | 101 |
| 103 | 102 |
| 104 class StackHandlerConstants : public AllStatic { | 103 class StackHandlerConstants : public AllStatic { |
| 105 public: | 104 public: |
| 106 static const int kNextOffset = 0 * kPointerSize; | 105 static const int kNextOffset = 0 * kPointerSize; |
| 107 static const int kCodeOffset = 1 * kPointerSize; | 106 static const int kCodeOffset = 1 * kPointerSize; |
| 108 static const int kStateOffset = 2 * kPointerSize; | 107 static const int kStateOffset = 2 * kPointerSize; |
| 109 static const int kContextOffset = 3 * kPointerSize; | 108 static const int kContextOffset = 3 * kPointerSize; |
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| 173 | 172 |
| 174 inline Object* JavaScriptFrame::function_slot_object() const { | 173 inline Object* JavaScriptFrame::function_slot_object() const { |
| 175 const int offset = JavaScriptFrameConstants::kFunctionOffset; | 174 const int offset = JavaScriptFrameConstants::kFunctionOffset; |
| 176 return Memory::Object_at(fp() + offset); | 175 return Memory::Object_at(fp() + offset); |
| 177 } | 176 } |
| 178 | 177 |
| 179 | 178 |
| 180 } } // namespace v8::internal | 179 } } // namespace v8::internal |
| 181 | 180 |
| 182 #endif // V8_ARM_FRAMES_ARM_H_ | 181 #endif // V8_ARM_FRAMES_ARM_H_ |
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