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1 // Copyright 2012 the V8 project authors. All rights reserved. | 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 | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 | 5 |
6 | 6 |
7 #include "src/v8.h" | 7 #include "src/v8.h" |
8 | 8 |
9 #if V8_TARGET_ARCH_MIPS | 9 #if V8_TARGET_ARCH_MIPS |
10 | 10 |
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94 #define __ ACCESS_MASM(masm) | 94 #define __ ACCESS_MASM(masm) |
95 | 95 |
96 | 96 |
97 | 97 |
98 static void Generate_DebugBreakCallHelper(MacroAssembler* masm, | 98 static void Generate_DebugBreakCallHelper(MacroAssembler* masm, |
99 RegList object_regs, | 99 RegList object_regs, |
100 RegList non_object_regs) { | 100 RegList non_object_regs) { |
101 { | 101 { |
102 FrameScope scope(masm, StackFrame::INTERNAL); | 102 FrameScope scope(masm, StackFrame::INTERNAL); |
103 | 103 |
| 104 // Load padding words on stack. |
| 105 __ li(at, Operand(Smi::FromInt(LiveEdit::kFramePaddingValue))); |
| 106 __ Subu(sp, sp, |
| 107 Operand(kPointerSize * LiveEdit::kFramePaddingInitialSize)); |
| 108 for (int i = LiveEdit::kFramePaddingInitialSize - 1; i >= 0; i--) { |
| 109 __ sw(at, MemOperand(sp, kPointerSize * i)); |
| 110 } |
| 111 __ li(at, Operand(Smi::FromInt(LiveEdit::kFramePaddingInitialSize))); |
| 112 __ push(at); |
| 113 |
104 // Store the registers containing live values on the expression stack to | 114 // Store the registers containing live values on the expression stack to |
105 // make sure that these are correctly updated during GC. Non object values | 115 // make sure that these are correctly updated during GC. Non object values |
106 // are stored as a smi causing it to be untouched by GC. | 116 // are stored as a smi causing it to be untouched by GC. |
107 ASSERT((object_regs & ~kJSCallerSaved) == 0); | 117 ASSERT((object_regs & ~kJSCallerSaved) == 0); |
108 ASSERT((non_object_regs & ~kJSCallerSaved) == 0); | 118 ASSERT((non_object_regs & ~kJSCallerSaved) == 0); |
109 ASSERT((object_regs & non_object_regs) == 0); | 119 ASSERT((object_regs & non_object_regs) == 0); |
110 if ((object_regs | non_object_regs) != 0) { | 120 if ((object_regs | non_object_regs) != 0) { |
111 for (int i = 0; i < kNumJSCallerSaved; i++) { | 121 for (int i = 0; i < kNumJSCallerSaved; i++) { |
112 int r = JSCallerSavedCode(i); | 122 int r = JSCallerSavedCode(i); |
113 Register reg = { r }; | 123 Register reg = { r }; |
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140 if ((non_object_regs & (1 << r)) != 0) { | 150 if ((non_object_regs & (1 << r)) != 0) { |
141 __ srl(reg, reg, kSmiTagSize); | 151 __ srl(reg, reg, kSmiTagSize); |
142 } | 152 } |
143 if (FLAG_debug_code && | 153 if (FLAG_debug_code && |
144 (((object_regs |non_object_regs) & (1 << r)) == 0)) { | 154 (((object_regs |non_object_regs) & (1 << r)) == 0)) { |
145 __ li(reg, kDebugZapValue); | 155 __ li(reg, kDebugZapValue); |
146 } | 156 } |
147 } | 157 } |
148 } | 158 } |
149 | 159 |
| 160 // Don't bother removing padding bytes pushed on the stack |
| 161 // as the frame is going to be restored right away. |
| 162 |
150 // Leave the internal frame. | 163 // Leave the internal frame. |
151 } | 164 } |
152 | 165 |
153 // Now that the break point has been handled, resume normal execution by | 166 // Now that the break point has been handled, resume normal execution by |
154 // jumping to the target address intended by the caller and that was | 167 // jumping to the target address intended by the caller and that was |
155 // overwritten by the address of DebugBreakXXX. | 168 // overwritten by the address of DebugBreakXXX. |
156 ExternalReference after_break_target = | 169 ExternalReference after_break_target = |
157 ExternalReference::debug_after_break_target_address(masm->isolate()); | 170 ExternalReference::debug_after_break_target_address(masm->isolate()); |
158 __ li(t9, Operand(after_break_target)); | 171 __ li(t9, Operand(after_break_target)); |
159 __ lw(t9, MemOperand(t9)); | 172 __ lw(t9, MemOperand(t9)); |
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283 | 296 |
284 | 297 |
285 void DebugCodegen::GenerateSlotDebugBreak(MacroAssembler* masm) { | 298 void DebugCodegen::GenerateSlotDebugBreak(MacroAssembler* masm) { |
286 // In the places where a debug break slot is inserted no registers can contain | 299 // In the places where a debug break slot is inserted no registers can contain |
287 // object pointers. | 300 // object pointers. |
288 Generate_DebugBreakCallHelper(masm, 0, 0); | 301 Generate_DebugBreakCallHelper(masm, 0, 0); |
289 } | 302 } |
290 | 303 |
291 | 304 |
292 void DebugCodegen::GeneratePlainReturnLiveEdit(MacroAssembler* masm) { | 305 void DebugCodegen::GeneratePlainReturnLiveEdit(MacroAssembler* masm) { |
293 masm->Abort(kLiveEditFrameDroppingIsNotSupportedOnMips); | 306 __ Ret(); |
294 } | 307 } |
295 | 308 |
296 | 309 |
297 void DebugCodegen::GenerateFrameDropperLiveEdit(MacroAssembler* masm) { | 310 void DebugCodegen::GenerateFrameDropperLiveEdit(MacroAssembler* masm) { |
298 masm->Abort(kLiveEditFrameDroppingIsNotSupportedOnMips); | 311 ExternalReference restarter_frame_function_slot = |
| 312 ExternalReference::debug_restarter_frame_function_pointer_address( |
| 313 masm->isolate()); |
| 314 __ li(at, Operand(restarter_frame_function_slot)); |
| 315 __ sw(zero_reg, MemOperand(at, 0)); |
| 316 |
| 317 // We do not know our frame height, but set sp based on fp. |
| 318 __ Subu(sp, fp, Operand(kPointerSize)); |
| 319 |
| 320 __ Pop(ra, fp, a1); // Return address, Frame, Function. |
| 321 |
| 322 // Load context from the function. |
| 323 __ lw(cp, FieldMemOperand(a1, JSFunction::kContextOffset)); |
| 324 |
| 325 // Get function code. |
| 326 __ lw(at, FieldMemOperand(a1, JSFunction::kSharedFunctionInfoOffset)); |
| 327 __ lw(at, FieldMemOperand(at, SharedFunctionInfo::kCodeOffset)); |
| 328 __ Addu(t9, at, Operand(Code::kHeaderSize - kHeapObjectTag)); |
| 329 |
| 330 // Re-run JSFunction, a1 is function, cp is context. |
| 331 __ Jump(t9); |
299 } | 332 } |
300 | 333 |
301 | 334 |
302 const bool LiveEdit::kFrameDropperSupported = false; | 335 const bool LiveEdit::kFrameDropperSupported = true; |
303 | 336 |
304 #undef __ | 337 #undef __ |
305 | 338 |
306 } } // namespace v8::internal | 339 } } // namespace v8::internal |
307 | 340 |
308 #endif // V8_TARGET_ARCH_MIPS | 341 #endif // V8_TARGET_ARCH_MIPS |
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