| // Copyright 2011 the V8 project authors. All rights reserved. |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are |
| // met: |
| // |
| // * Redistributions of source code must retain the above copyright |
| // notice, this list of conditions and the following disclaimer. |
| // * Redistributions in binary form must reproduce the above |
| // copyright notice, this list of conditions and the following |
| // disclaimer in the documentation and/or other materials provided |
| // with the distribution. |
| // * Neither the name of Google Inc. nor the names of its |
| // contributors may be used to endorse or promote products derived |
| // from this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| |
| |
| #include "v8.h" |
| |
| #if defined(V8_TARGET_ARCH_MIPS) |
| |
| #include "codegen.h" |
| #include "debug.h" |
| |
| namespace v8 { |
| namespace internal { |
| |
| #ifdef ENABLE_DEBUGGER_SUPPORT |
| |
| bool BreakLocationIterator::IsDebugBreakAtReturn() { |
| return Debug::IsDebugBreakAtReturn(rinfo()); |
| } |
| |
| |
| void BreakLocationIterator::SetDebugBreakAtReturn() { |
| // Mips return sequence: |
| // mov sp, fp |
| // lw fp, sp(0) |
| // lw ra, sp(4) |
| // addiu sp, sp, 8 |
| // addiu sp, sp, N |
| // jr ra |
| // nop (in branch delay slot) |
| |
| // Make sure this constant matches the number if instrucntions we emit. |
| ASSERT(Assembler::kJSReturnSequenceInstructions == 7); |
| CodePatcher patcher(rinfo()->pc(), Assembler::kJSReturnSequenceInstructions); |
| // li and Call pseudo-instructions emit two instructions each. |
| patcher.masm()->li(v8::internal::t9, |
| Operand(reinterpret_cast<int32_t>( |
| Isolate::Current()->debug()->debug_break_return()->entry()))); |
| patcher.masm()->Call(v8::internal::t9); |
| patcher.masm()->nop(); |
| patcher.masm()->nop(); |
| patcher.masm()->nop(); |
| |
| // TODO(mips): Open issue about using breakpoint instruction instead of nops. |
| // patcher.masm()->bkpt(0); |
| } |
| |
| |
| // Restore the JS frame exit code. |
| void BreakLocationIterator::ClearDebugBreakAtReturn() { |
| rinfo()->PatchCode(original_rinfo()->pc(), |
| Assembler::kJSReturnSequenceInstructions); |
| } |
| |
| |
| // A debug break in the exit code is identified by the JS frame exit code |
| // having been patched with li/call psuedo-instrunction (liu/ori/jalr). |
| bool Debug::IsDebugBreakAtReturn(RelocInfo* rinfo) { |
| ASSERT(RelocInfo::IsJSReturn(rinfo->rmode())); |
| return rinfo->IsPatchedReturnSequence(); |
| } |
| |
| |
| bool BreakLocationIterator::IsDebugBreakAtSlot() { |
| ASSERT(IsDebugBreakSlot()); |
| // Check whether the debug break slot instructions have been patched. |
| return rinfo()->IsPatchedDebugBreakSlotSequence(); |
| } |
| |
| |
| void BreakLocationIterator::SetDebugBreakAtSlot() { |
| ASSERT(IsDebugBreakSlot()); |
| // Patch the code changing the debug break slot code from: |
| // nop(DEBUG_BREAK_NOP) - nop(1) is sll(zero_reg, zero_reg, 1) |
| // nop(DEBUG_BREAK_NOP) |
| // nop(DEBUG_BREAK_NOP) |
| // nop(DEBUG_BREAK_NOP) |
| // to a call to the debug break slot code. |
| // li t9, address (lui t9 / ori t9 instruction pair) |
| // call t9 (jalr t9 / nop instruction pair) |
| CodePatcher patcher(rinfo()->pc(), Assembler::kDebugBreakSlotInstructions); |
| patcher.masm()->li(v8::internal::t9, Operand(reinterpret_cast<int32_t>( |
| Isolate::Current()->debug()->debug_break_slot()->entry()))); |
| patcher.masm()->Call(v8::internal::t9); |
| } |
| |
| |
| void BreakLocationIterator::ClearDebugBreakAtSlot() { |
| ASSERT(IsDebugBreakSlot()); |
| rinfo()->PatchCode(original_rinfo()->pc(), |
| Assembler::kDebugBreakSlotInstructions); |
| } |
| |
| |
| #define __ ACCESS_MASM(masm) |
| |
| |
| |
| static void Generate_DebugBreakCallHelper(MacroAssembler* masm, |
| RegList object_regs, |
| RegList non_object_regs) { |
| { |
| FrameScope scope(masm, StackFrame::INTERNAL); |
| |
| // Store the registers containing live values on the expression stack to |
| // make sure that these are correctly updated during GC. Non object values |
| // are stored as a smi causing it to be untouched by GC. |
| ASSERT((object_regs & ~kJSCallerSaved) == 0); |
| ASSERT((non_object_regs & ~kJSCallerSaved) == 0); |
| ASSERT((object_regs & non_object_regs) == 0); |
| if ((object_regs | non_object_regs) != 0) { |
| for (int i = 0; i < kNumJSCallerSaved; i++) { |
| int r = JSCallerSavedCode(i); |
| Register reg = { r }; |
| if ((non_object_regs & (1 << r)) != 0) { |
| if (FLAG_debug_code) { |
| __ And(at, reg, 0xc0000000); |
| __ Assert( |
| eq, "Unable to encode value as smi", at, Operand(zero_reg)); |
| } |
| __ sll(reg, reg, kSmiTagSize); |
| } |
| } |
| __ MultiPush(object_regs | non_object_regs); |
| } |
| |
| #ifdef DEBUG |
| __ RecordComment("// Calling from debug break to runtime - come in - over"); |
| #endif |
| __ mov(a0, zero_reg); // No arguments. |
| __ li(a1, Operand(ExternalReference::debug_break(masm->isolate()))); |
| |
| CEntryStub ceb(1); |
| __ CallStub(&ceb); |
| |
| // Restore the register values from the expression stack. |
| if ((object_regs | non_object_regs) != 0) { |
| __ MultiPop(object_regs | non_object_regs); |
| for (int i = 0; i < kNumJSCallerSaved; i++) { |
| int r = JSCallerSavedCode(i); |
| Register reg = { r }; |
| if ((non_object_regs & (1 << r)) != 0) { |
| __ srl(reg, reg, kSmiTagSize); |
| } |
| if (FLAG_debug_code && |
| (((object_regs |non_object_regs) & (1 << r)) == 0)) { |
| __ li(reg, kDebugZapValue); |
| } |
| } |
| } |
| |
| // Leave the internal frame. |
| } |
| |
| // Now that the break point has been handled, resume normal execution by |
| // jumping to the target address intended by the caller and that was |
| // overwritten by the address of DebugBreakXXX. |
| __ li(t9, Operand( |
| ExternalReference(Debug_Address::AfterBreakTarget(), masm->isolate()))); |
| __ lw(t9, MemOperand(t9)); |
| __ Jump(t9); |
| } |
| |
| |
| void Debug::GenerateLoadICDebugBreak(MacroAssembler* masm) { |
| // Calling convention for IC load (from ic-mips.cc). |
| // ----------- S t a t e ------------- |
| // -- a2 : name |
| // -- ra : return address |
| // -- a0 : receiver |
| // -- [sp] : receiver |
| // ----------------------------------- |
| // Registers a0 and a2 contain objects that need to be pushed on the |
| // expression stack of the fake JS frame. |
| Generate_DebugBreakCallHelper(masm, a0.bit() | a2.bit(), 0); |
| } |
| |
| |
| void Debug::GenerateStoreICDebugBreak(MacroAssembler* masm) { |
| // Calling convention for IC store (from ic-mips.cc). |
| // ----------- S t a t e ------------- |
| // -- a0 : value |
| // -- a1 : receiver |
| // -- a2 : name |
| // -- ra : return address |
| // ----------------------------------- |
| // Registers a0, a1, and a2 contain objects that need to be pushed on the |
| // expression stack of the fake JS frame. |
| Generate_DebugBreakCallHelper(masm, a0.bit() | a1.bit() | a2.bit(), 0); |
| } |
| |
| |
| void Debug::GenerateKeyedLoadICDebugBreak(MacroAssembler* masm) { |
| // ---------- S t a t e -------------- |
| // -- ra : return address |
| // -- a0 : key |
| // -- a1 : receiver |
| Generate_DebugBreakCallHelper(masm, a0.bit() | a1.bit(), 0); |
| } |
| |
| |
| void Debug::GenerateKeyedStoreICDebugBreak(MacroAssembler* masm) { |
| // ---------- S t a t e -------------- |
| // -- a0 : value |
| // -- a1 : key |
| // -- a2 : receiver |
| // -- ra : return address |
| Generate_DebugBreakCallHelper(masm, a0.bit() | a1.bit() | a2.bit(), 0); |
| } |
| |
| |
| void Debug::GenerateCallICDebugBreak(MacroAssembler* masm) { |
| // Calling convention for IC call (from ic-mips.cc). |
| // ----------- S t a t e ------------- |
| // -- a2: name |
| // ----------------------------------- |
| Generate_DebugBreakCallHelper(masm, a2.bit(), 0); |
| } |
| |
| |
| void Debug::GenerateReturnDebugBreak(MacroAssembler* masm) { |
| // In places other than IC call sites it is expected that v0 is TOS which |
| // is an object - this is not generally the case so this should be used with |
| // care. |
| Generate_DebugBreakCallHelper(masm, v0.bit(), 0); |
| } |
| |
| |
| void Debug::GenerateCallFunctionStubDebugBreak(MacroAssembler* masm) { |
| // Register state for CallFunctionStub (from code-stubs-mips.cc). |
| // ----------- S t a t e ------------- |
| // -- a1 : function |
| // ----------------------------------- |
| Generate_DebugBreakCallHelper(masm, a1.bit(), 0); |
| } |
| |
| |
| void Debug::GenerateCallFunctionStubRecordDebugBreak(MacroAssembler* masm) { |
| // Register state for CallFunctionStub (from code-stubs-mips.cc). |
| // ----------- S t a t e ------------- |
| // -- a1 : function |
| // -- a2 : cache cell for call target |
| // ----------------------------------- |
| Generate_DebugBreakCallHelper(masm, a1.bit() | a2.bit(), 0); |
| } |
| |
| |
| void Debug::GenerateCallConstructStubDebugBreak(MacroAssembler* masm) { |
| // Calling convention for CallConstructStub (from code-stubs-mips.cc). |
| // ----------- S t a t e ------------- |
| // -- a0 : number of arguments (not smi) |
| // -- a1 : constructor function |
| // ----------------------------------- |
| Generate_DebugBreakCallHelper(masm, a1.bit() , a0.bit()); |
| } |
| |
| |
| void Debug::GenerateCallConstructStubRecordDebugBreak(MacroAssembler* masm) { |
| // Calling convention for CallConstructStub (from code-stubs-mips.cc). |
| // ----------- S t a t e ------------- |
| // -- a0 : number of arguments (not smi) |
| // -- a1 : constructor function |
| // -- a2 : cache cell for call target |
| // ----------------------------------- |
| Generate_DebugBreakCallHelper(masm, a1.bit() | a2.bit(), a0.bit()); |
| } |
| |
| |
| void Debug::GenerateSlot(MacroAssembler* masm) { |
| // Generate enough nop's to make space for a call instruction. Avoid emitting |
| // the trampoline pool in the debug break slot code. |
| Assembler::BlockTrampolinePoolScope block_trampoline_pool(masm); |
| Label check_codesize; |
| __ bind(&check_codesize); |
| __ RecordDebugBreakSlot(); |
| for (int i = 0; i < Assembler::kDebugBreakSlotInstructions; i++) { |
| __ nop(MacroAssembler::DEBUG_BREAK_NOP); |
| } |
| ASSERT_EQ(Assembler::kDebugBreakSlotInstructions, |
| masm->InstructionsGeneratedSince(&check_codesize)); |
| } |
| |
| |
| void Debug::GenerateSlotDebugBreak(MacroAssembler* masm) { |
| // In the places where a debug break slot is inserted no registers can contain |
| // object pointers. |
| Generate_DebugBreakCallHelper(masm, 0, 0); |
| } |
| |
| |
| void Debug::GeneratePlainReturnLiveEdit(MacroAssembler* masm) { |
| masm->Abort("LiveEdit frame dropping is not supported on mips"); |
| } |
| |
| |
| void Debug::GenerateFrameDropperLiveEdit(MacroAssembler* masm) { |
| masm->Abort("LiveEdit frame dropping is not supported on mips"); |
| } |
| |
| |
| const bool Debug::kFrameDropperSupported = false; |
| |
| #undef __ |
| |
| |
| #endif // ENABLE_DEBUGGER_SUPPORT |
| |
| } } // namespace v8::internal |
| |
| #endif // V8_TARGET_ARCH_MIPS |