| // 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_ARM) |
| |
| #include "codegen.h" |
| #include "debug.h" |
| |
| namespace v8 { |
| namespace internal { |
| |
| #ifdef ENABLE_DEBUGGER_SUPPORT |
| bool BreakLocationIterator::IsDebugBreakAtReturn() { |
| return Debug::IsDebugBreakAtReturn(rinfo()); |
| } |
| |
| |
| void BreakLocationIterator::SetDebugBreakAtReturn() { |
| // Patch the code changing the return from JS function sequence from |
| // mov sp, fp |
| // ldmia sp!, {fp, lr} |
| // add sp, sp, #4 |
| // bx lr |
| // to a call to the debug break return code. |
| // #if USE_BLX |
| // ldr ip, [pc, #0] |
| // blx ip |
| // #else |
| // mov lr, pc |
| // ldr pc, [pc, #-4] |
| // #endif |
| // <debug break return code entry point address> |
| // bktp 0 |
| CodePatcher patcher(rinfo()->pc(), Assembler::kJSReturnSequenceInstructions); |
| #ifdef USE_BLX |
| patcher.masm()->ldr(v8::internal::ip, MemOperand(v8::internal::pc, 0)); |
| patcher.masm()->blx(v8::internal::ip); |
| #else |
| patcher.masm()->mov(v8::internal::lr, v8::internal::pc); |
| patcher.masm()->ldr(v8::internal::pc, MemOperand(v8::internal::pc, -4)); |
| #endif |
| patcher.Emit(Isolate::Current()->debug()->debug_break_return()->entry()); |
| 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 frame exit code is identified by the JS frame exit code |
| // having been patched with a call instruction. |
| 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 |
| // mov r2, r2 |
| // mov r2, r2 |
| // mov r2, r2 |
| // to a call to the debug break slot code. |
| // #if USE_BLX |
| // ldr ip, [pc, #0] |
| // blx ip |
| // #else |
| // mov lr, pc |
| // ldr pc, [pc, #-4] |
| // #endif |
| // <debug break slot code entry point address> |
| CodePatcher patcher(rinfo()->pc(), Assembler::kDebugBreakSlotInstructions); |
| #ifdef USE_BLX |
| patcher.masm()->ldr(v8::internal::ip, MemOperand(v8::internal::pc, 0)); |
| patcher.masm()->blx(v8::internal::ip); |
| #else |
| patcher.masm()->mov(v8::internal::lr, v8::internal::pc); |
| patcher.masm()->ldr(v8::internal::pc, MemOperand(v8::internal::pc, -4)); |
| #endif |
| patcher.Emit(Isolate::Current()->debug()->debug_break_slot()->entry()); |
| } |
| |
| |
| 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) { |
| __ tst(reg, Operand(0xc0000000)); |
| __ Assert(eq, "Unable to encode value as smi"); |
| } |
| __ mov(reg, Operand(reg, LSL, kSmiTagSize)); |
| } |
| } |
| __ stm(db_w, sp, object_regs | non_object_regs); |
| } |
| |
| #ifdef DEBUG |
| __ RecordComment("// Calling from debug break to runtime - come in - over"); |
| #endif |
| __ mov(r0, Operand(0, RelocInfo::NONE)); // no arguments |
| __ mov(r1, 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) { |
| __ ldm(ia_w, sp, 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) { |
| __ mov(reg, Operand(reg, LSR, kSmiTagSize)); |
| } |
| if (FLAG_debug_code && |
| (((object_regs |non_object_regs) & (1 << r)) == 0)) { |
| __ mov(reg, Operand(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. |
| ExternalReference after_break_target = |
| ExternalReference(Debug_Address::AfterBreakTarget(), masm->isolate()); |
| __ mov(ip, Operand(after_break_target)); |
| __ ldr(ip, MemOperand(ip)); |
| __ Jump(ip); |
| } |
| |
| |
| void Debug::GenerateLoadICDebugBreak(MacroAssembler* masm) { |
| // Calling convention for IC load (from ic-arm.cc). |
| // ----------- S t a t e ------------- |
| // -- r2 : name |
| // -- lr : return address |
| // -- r0 : receiver |
| // -- [sp] : receiver |
| // ----------------------------------- |
| // Registers r0 and r2 contain objects that need to be pushed on the |
| // expression stack of the fake JS frame. |
| Generate_DebugBreakCallHelper(masm, r0.bit() | r2.bit(), 0); |
| } |
| |
| |
| void Debug::GenerateStoreICDebugBreak(MacroAssembler* masm) { |
| // Calling convention for IC store (from ic-arm.cc). |
| // ----------- S t a t e ------------- |
| // -- r0 : value |
| // -- r1 : receiver |
| // -- r2 : name |
| // -- lr : return address |
| // ----------------------------------- |
| // Registers r0, r1, and r2 contain objects that need to be pushed on the |
| // expression stack of the fake JS frame. |
| Generate_DebugBreakCallHelper(masm, r0.bit() | r1.bit() | r2.bit(), 0); |
| } |
| |
| |
| void Debug::GenerateKeyedLoadICDebugBreak(MacroAssembler* masm) { |
| // ---------- S t a t e -------------- |
| // -- lr : return address |
| // -- r0 : key |
| // -- r1 : receiver |
| Generate_DebugBreakCallHelper(masm, r0.bit() | r1.bit(), 0); |
| } |
| |
| |
| void Debug::GenerateKeyedStoreICDebugBreak(MacroAssembler* masm) { |
| // ---------- S t a t e -------------- |
| // -- r0 : value |
| // -- r1 : key |
| // -- r2 : receiver |
| // -- lr : return address |
| Generate_DebugBreakCallHelper(masm, r0.bit() | r1.bit() | r2.bit(), 0); |
| } |
| |
| |
| void Debug::GenerateCallICDebugBreak(MacroAssembler* masm) { |
| // Calling convention for IC call (from ic-arm.cc) |
| // ----------- S t a t e ------------- |
| // -- r2 : name |
| // ----------------------------------- |
| Generate_DebugBreakCallHelper(masm, r2.bit(), 0); |
| } |
| |
| |
| void Debug::GenerateConstructCallDebugBreak(MacroAssembler* masm) { |
| // Calling convention for construct call (from builtins-arm.cc) |
| // -- r0 : number of arguments (not smi) |
| // -- r1 : constructor function |
| Generate_DebugBreakCallHelper(masm, r1.bit(), r0.bit()); |
| } |
| |
| |
| void Debug::GenerateReturnDebugBreak(MacroAssembler* masm) { |
| // In places other than IC call sites it is expected that r0 is TOS which |
| // is an object - this is not generally the case so this should be used with |
| // care. |
| Generate_DebugBreakCallHelper(masm, r0.bit(), 0); |
| } |
| |
| |
| void Debug::GenerateCallFunctionStubDebugBreak(MacroAssembler* masm) { |
| // ----------- S t a t e ------------- |
| // -- r1 : function |
| // ----------------------------------- |
| Generate_DebugBreakCallHelper(masm, r1.bit(), 0); |
| } |
| |
| |
| void Debug::GenerateSlot(MacroAssembler* masm) { |
| // Generate enough nop's to make space for a call instruction. Avoid emitting |
| // the constant pool in the debug break slot code. |
| Assembler::BlockConstPoolScope block_const_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 arm"); |
| } |
| |
| |
| void Debug::GenerateFrameDropperLiveEdit(MacroAssembler* masm) { |
| masm->Abort("LiveEdit frame dropping is not supported on arm"); |
| } |
| |
| const bool Debug::kFrameDropperSupported = false; |
| |
| #undef __ |
| |
| |
| |
| #endif // ENABLE_DEBUGGER_SUPPORT |
| |
| } } // namespace v8::internal |
| |
| #endif // V8_TARGET_ARCH_ARM |