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| 1 // Copyright 2006-2008 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 #include "v8.h" |
| 29 |
| 30 #include "codegen-inl.h" |
| 31 #include "debug.h" |
| 32 |
| 33 namespace v8 { namespace internal { |
| 34 |
| 35 #ifdef ENABLE_DEBUGGER_SUPPORT |
| 36 // Currently debug break is not supported in frame exit code on ARM. |
| 37 bool BreakLocationIterator::IsDebugBreakAtReturn() { |
| 38 return false; |
| 39 } |
| 40 |
| 41 |
| 42 // Currently debug break is not supported in frame exit code on ARM. |
| 43 void BreakLocationIterator::SetDebugBreakAtReturn() { |
| 44 UNIMPLEMENTED(); |
| 45 } |
| 46 |
| 47 |
| 48 // Currently debug break is not supported in frame exit code on ARM. |
| 49 void BreakLocationIterator::ClearDebugBreakAtReturn() { |
| 50 UNIMPLEMENTED(); |
| 51 } |
| 52 |
| 53 |
| 54 bool Debug::IsDebugBreakAtReturn(RelocInfo* rinfo) { |
| 55 ASSERT(RelocInfo::IsJSReturn(rinfo->rmode())); |
| 56 // Currently debug break is not supported in frame exit code on ARM. |
| 57 return false; |
| 58 } |
| 59 |
| 60 |
| 61 #define __ ACCESS_MASM(masm) |
| 62 |
| 63 |
| 64 static void Generate_DebugBreakCallHelper(MacroAssembler* masm, |
| 65 RegList pointer_regs) { |
| 66 // Save the content of all general purpose registers in memory. This copy in |
| 67 // memory is later pushed onto the JS expression stack for the fake JS frame |
| 68 // generated and also to the C frame generated on top of that. In the JS |
| 69 // frame ONLY the registers containing pointers will be pushed on the |
| 70 // expression stack. This causes the GC to update these pointers so that |
| 71 // they will have the correct value when returning from the debugger. |
| 72 __ SaveRegistersToMemory(kJSCallerSaved); |
| 73 |
| 74 __ EnterInternalFrame(); |
| 75 |
| 76 // Store the registers containing object pointers on the expression stack to |
| 77 // make sure that these are correctly updated during GC. |
| 78 // Use sp as base to push. |
| 79 __ CopyRegistersFromMemoryToStack(sp, pointer_regs); |
| 80 |
| 81 #ifdef DEBUG |
| 82 __ RecordComment("// Calling from debug break to runtime - come in - over"); |
| 83 #endif |
| 84 __ mov(r0, Operand(0)); // no arguments |
| 85 __ mov(r1, Operand(ExternalReference::debug_break())); |
| 86 |
| 87 CEntryDebugBreakStub ceb; |
| 88 __ CallStub(&ceb); |
| 89 |
| 90 // Restore the register values containing object pointers from the expression |
| 91 // stack in the reverse order as they where pushed. |
| 92 // Use sp as base to pop. |
| 93 __ CopyRegistersFromStackToMemory(sp, r3, pointer_regs); |
| 94 |
| 95 __ LeaveInternalFrame(); |
| 96 |
| 97 // Inlined ExitJSFrame ends here. |
| 98 |
| 99 // Finally restore all registers. |
| 100 __ RestoreRegistersFromMemory(kJSCallerSaved); |
| 101 |
| 102 // Now that the break point has been handled, resume normal execution by |
| 103 // jumping to the target address intended by the caller and that was |
| 104 // overwritten by the address of DebugBreakXXX. |
| 105 __ mov(ip, Operand(ExternalReference(Debug_Address::AfterBreakTarget()))); |
| 106 __ ldr(ip, MemOperand(ip)); |
| 107 __ Jump(ip); |
| 108 } |
| 109 |
| 110 |
| 111 void Debug::GenerateLoadICDebugBreak(MacroAssembler* masm) { |
| 112 // Calling convention for IC load (from ic-arm.cc). |
| 113 // ----------- S t a t e ------------- |
| 114 // -- r0 : receiver |
| 115 // -- r2 : name |
| 116 // -- lr : return address |
| 117 // -- [sp] : receiver |
| 118 // ----------------------------------- |
| 119 // Registers r0 and r2 contain objects that needs to be pushed on the |
| 120 // expression stack of the fake JS frame. |
| 121 Generate_DebugBreakCallHelper(masm, r0.bit() | r2.bit()); |
| 122 } |
| 123 |
| 124 |
| 125 void Debug::GenerateStoreICDebugBreak(MacroAssembler* masm) { |
| 126 // Calling convention for IC store (from ic-arm.cc). |
| 127 // ----------- S t a t e ------------- |
| 128 // -- r0 : receiver |
| 129 // -- r2 : name |
| 130 // -- lr : return address |
| 131 // -- [sp] : receiver |
| 132 // ----------------------------------- |
| 133 // Registers r0 and r2 contain objects that needs to be pushed on the |
| 134 // expression stack of the fake JS frame. |
| 135 Generate_DebugBreakCallHelper(masm, r0.bit() | r2.bit()); |
| 136 } |
| 137 |
| 138 |
| 139 void Debug::GenerateKeyedLoadICDebugBreak(MacroAssembler* masm) { |
| 140 // Keyed load IC not implemented on ARM. |
| 141 } |
| 142 |
| 143 |
| 144 void Debug::GenerateKeyedStoreICDebugBreak(MacroAssembler* masm) { |
| 145 // Keyed store IC not implemented on ARM. |
| 146 } |
| 147 |
| 148 |
| 149 void Debug::GenerateCallICDebugBreak(MacroAssembler* masm) { |
| 150 // Calling convention for IC call (from ic-arm.cc) |
| 151 // ----------- S t a t e ------------- |
| 152 // -- r0: number of arguments |
| 153 // -- r1: receiver |
| 154 // -- lr: return address |
| 155 // ----------------------------------- |
| 156 // Register r1 contains an object that needs to be pushed on the expression |
| 157 // stack of the fake JS frame. r0 is the actual number of arguments not |
| 158 // encoded as a smi, therefore it cannot be on the expression stack of the |
| 159 // fake JS frame as it can easily be an invalid pointer (e.g. 1). r0 will be |
| 160 // pushed on the stack of the C frame and restored from there. |
| 161 Generate_DebugBreakCallHelper(masm, r1.bit()); |
| 162 } |
| 163 |
| 164 |
| 165 void Debug::GenerateConstructCallDebugBreak(MacroAssembler* masm) { |
| 166 // In places other than IC call sites it is expected that r0 is TOS which |
| 167 // is an object - this is not generally the case so this should be used with |
| 168 // care. |
| 169 Generate_DebugBreakCallHelper(masm, r0.bit()); |
| 170 } |
| 171 |
| 172 |
| 173 void Debug::GenerateReturnDebugBreak(MacroAssembler* masm) { |
| 174 // In places other than IC call sites it is expected that r0 is TOS which |
| 175 // is an object - this is not generally the case so this should be used with |
| 176 // care. |
| 177 Generate_DebugBreakCallHelper(masm, r0.bit()); |
| 178 } |
| 179 |
| 180 |
| 181 void Debug::GenerateReturnDebugBreakEntry(MacroAssembler* masm) { |
| 182 // Generate nothing as this handling of debug break return is not done this |
| 183 // way on ARM - yet. |
| 184 } |
| 185 |
| 186 |
| 187 void Debug::GenerateStubNoRegistersDebugBreak(MacroAssembler* masm) { |
| 188 // Generate nothing as CodeStub CallFunction is not used on ARM. |
| 189 } |
| 190 |
| 191 |
| 192 #undef __ |
| 193 |
| 194 #endif // ENABLE_DEBUGGER_SUPPORT |
| 195 |
| 196 } } // namespace v8::internal |
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