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// Copyright 2012 the V8 project authors. All rights reserved.
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// Copyright IBM Corp. 2012, 2013. All rights reserved.
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following
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// disclaimer in the documentation and/or other materials provided
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// with the distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#if defined(V8_TARGET_ARCH_PPC)
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#ifdef ENABLE_DEBUGGER_SUPPORT
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bool BreakLocationIterator::IsDebugBreakAtReturn() {
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return Debug::IsDebugBreakAtReturn(rinfo());
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void BreakLocationIterator::SetDebugBreakAtReturn() {
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// Patch the code changing the return from JS function sequence from
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// addi sp, sp, <delta>
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// to a call to the debug break return code.
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// this uses a FIXED_SEQUENCE to load a 32bit constant
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// lis r0, <address hi>
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// ori r0, r0, <address lo>
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// The 64bit sequence is a bit longer
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// lis r0, <address bits 63-48>
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// ori r0, r0, <address bits 47-32>
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// oris r0, r0, <address bits 31-16>
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// ori r0, r0, <address bits 15-0>
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CodePatcher patcher(rinfo()->pc(), Assembler::kJSReturnSequenceInstructions);
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// printf("SetDebugBreakAtReturn: pc=%08x\n", (unsigned int)rinfo()->pc());
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patcher.masm()->mov(v8::internal::r0,
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Operand(reinterpret_cast<intptr_t>(
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Isolate::Current()->debug()->debug_break_return()->entry())));
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patcher.masm()->mtlr(v8::internal::r0);
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patcher.masm()->bclr(BA, SetLK);
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patcher.masm()->bkpt(0);
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// Restore the JS frame exit code.
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void BreakLocationIterator::ClearDebugBreakAtReturn() {
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rinfo()->PatchCode(original_rinfo()->pc(),
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Assembler::kJSReturnSequenceInstructions);
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// A debug break in the frame exit code is identified by the JS frame exit code
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// having been patched with a call instruction.
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bool Debug::IsDebugBreakAtReturn(RelocInfo* rinfo) {
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ASSERT(RelocInfo::IsJSReturn(rinfo->rmode()));
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return rinfo->IsPatchedReturnSequence();
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bool BreakLocationIterator::IsDebugBreakAtSlot() {
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ASSERT(IsDebugBreakSlot());
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// Check whether the debug break slot instructions have been patched.
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return rinfo()->IsPatchedDebugBreakSlotSequence();
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void BreakLocationIterator::SetDebugBreakAtSlot() {
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ASSERT(IsDebugBreakSlot());
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// Patch the code changing the debug break slot code from
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// to a call to the debug break code, using a FIXED_SEQUENCE.
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// lis r0, <address hi>
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// ori r0, r0, <address lo>
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// The 64bit sequence is +3 instructions longer for the load
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CodePatcher patcher(rinfo()->pc(), Assembler::kDebugBreakSlotInstructions);
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// printf("SetDebugBreakAtSlot: pc=%08x\n", (unsigned int)rinfo()->pc());
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patcher.masm()->mov(v8::internal::r0,
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Operand(reinterpret_cast<intptr_t>(
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Isolate::Current()->debug()->debug_break_slot()->entry())));
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patcher.masm()->mtlr(v8::internal::r0);
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patcher.masm()->bclr(BA, SetLK);
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void BreakLocationIterator::ClearDebugBreakAtSlot() {
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ASSERT(IsDebugBreakSlot());
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rinfo()->PatchCode(original_rinfo()->pc(),
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Assembler::kDebugBreakSlotInstructions);
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const bool Debug::FramePaddingLayout::kIsSupported = false;
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#define __ ACCESS_MASM(masm)
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static void Generate_DebugBreakCallHelper(MacroAssembler* masm,
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RegList non_object_regs) {
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FrameScope scope(masm, StackFrame::INTERNAL);
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// printf("Generate_DebugBreakCallHelper\n");
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// Store the registers containing live values on the expression stack to
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// make sure that these are correctly updated during GC. Non object values
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// are stored as a smi causing it to be untouched by GC.
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ASSERT((object_regs & ~kJSCallerSaved) == 0);
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ASSERT((non_object_regs & ~kJSCallerSaved) == 0);
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ASSERT((object_regs & non_object_regs) == 0);
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if ((object_regs | non_object_regs) != 0) {
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for (int i = 0; i < kNumJSCallerSaved; i++) {
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int r = JSCallerSavedCode(i);
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Register reg = { r };
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if ((non_object_regs & (1 << r)) != 0) {
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if (FLAG_debug_code) {
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__ andis(r0, reg, Operand(0xc000));
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__ Assert(eq, "Unable to encode value as smi", cr0);
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__ MultiPush(object_regs | non_object_regs);
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__ RecordComment("// Calling from debug break to runtime - come in - over");
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__ mov(r3, Operand(0, RelocInfo::NONE)); // no arguments
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__ mov(r4, Operand(ExternalReference::debug_break(masm->isolate())));
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// Restore the register values from the expression stack.
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if ((object_regs | non_object_regs) != 0) {
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__ MultiPop(object_regs | non_object_regs);
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for (int i = 0; i < kNumJSCallerSaved; i++) {
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int r = JSCallerSavedCode(i);
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Register reg = { r };
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if ((non_object_regs & (1 << r)) != 0) {
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if (FLAG_debug_code &&
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(((object_regs |non_object_regs) & (1 << r)) == 0)) {
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__ mov(reg, Operand(kDebugZapValue));
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// Leave the internal frame.
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// Now that the break point has been handled, resume normal execution by
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// jumping to the target address intended by the caller and that was
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// overwritten by the address of DebugBreakXXX.
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ExternalReference after_break_target =
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ExternalReference(Debug_Address::AfterBreakTarget(), masm->isolate());
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__ mov(ip, Operand(after_break_target));
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__ LoadP(ip, MemOperand(ip));
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void Debug::GenerateLoadICDebugBreak(MacroAssembler* masm) {
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// Calling convention for IC load (from ic-ppc.cc).
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// ----------- S t a t e -------------
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// -- lr : return address
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// -- [sp] : receiver
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// -----------------------------------
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// Registers r3 and r5 contain objects that need to be pushed on the
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// expression stack of the fake JS frame.
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Generate_DebugBreakCallHelper(masm, r3.bit() | r5.bit(), 0);
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void Debug::GenerateStoreICDebugBreak(MacroAssembler* masm) {
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// Calling convention for IC store (from ic-ppc.cc).
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// ----------- S t a t e -------------
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// -- lr : return address
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// -----------------------------------
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// Registers r3, r4, and r5 contain objects that need to be pushed on the
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// expression stack of the fake JS frame.
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Generate_DebugBreakCallHelper(masm, r3.bit() | r4.bit() | r5.bit(), 0);
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void Debug::GenerateKeyedLoadICDebugBreak(MacroAssembler* masm) {
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// ---------- S t a t e --------------
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// -- lr : return address
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Generate_DebugBreakCallHelper(masm, r3.bit() | r4.bit(), 0);
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void Debug::GenerateKeyedStoreICDebugBreak(MacroAssembler* masm) {
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// ---------- S t a t e --------------
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// -- lr : return address
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Generate_DebugBreakCallHelper(masm, r3.bit() | r4.bit() | r5.bit(), 0);
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void Debug::GenerateCallICDebugBreak(MacroAssembler* masm) {
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// Calling convention for IC call (from ic-ppc.cc)
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// ----------- S t a t e -------------
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// -----------------------------------
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Generate_DebugBreakCallHelper(masm, r5.bit(), 0);
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void Debug::GenerateReturnDebugBreak(MacroAssembler* masm) {
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// In places other than IC call sites it is expected that r3 is TOS which
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// is an object - this is not generally the case so this should be used with
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Generate_DebugBreakCallHelper(masm, r3.bit(), 0);
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void Debug::GenerateCallFunctionStubDebugBreak(MacroAssembler* masm) {
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// Register state for CallFunctionStub (from code-stubs-ppc.cc).
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// ----------- S t a t e -------------
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// -----------------------------------
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Generate_DebugBreakCallHelper(masm, r4.bit(), 0);
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void Debug::GenerateCallFunctionStubRecordDebugBreak(MacroAssembler* masm) {
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// Register state for CallFunctionStub (from code-stubs-ppc.cc).
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// ----------- S t a t e -------------
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// -- r5 : cache cell for call target
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// -----------------------------------
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Generate_DebugBreakCallHelper(masm, r4.bit() | r5.bit(), 0);
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void Debug::GenerateCallConstructStubDebugBreak(MacroAssembler* masm) {
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// Calling convention for CallConstructStub (from code-stubs-ppc.cc)
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// ----------- S t a t e -------------
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// -- r3 : number of arguments (not smi)
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// -- r4 : constructor function
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// -----------------------------------
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Generate_DebugBreakCallHelper(masm, r4.bit(), r3.bit());
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void Debug::GenerateCallConstructStubRecordDebugBreak(MacroAssembler* masm) {
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// Calling convention for CallConstructStub (from code-stubs-ppc.cc)
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// ----------- S t a t e -------------
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// -- r3 : number of arguments (not smi)
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// -- r4 : constructor function
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// -- r5 : cache cell for call target
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// -----------------------------------
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Generate_DebugBreakCallHelper(masm, r4.bit() | r5.bit(), r3.bit());
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void Debug::GenerateSlot(MacroAssembler* masm) {
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// Generate enough nop's to make space for a call instruction. Avoid emitting
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// the trampoline pool in the debug break slot code.
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Assembler::BlockTrampolinePoolScope block_trampoline_pool(masm);
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Label check_codesize;
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__ bind(&check_codesize);
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__ RecordDebugBreakSlot();
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for (int i = 0; i < Assembler::kDebugBreakSlotInstructions; i++) {
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__ nop(MacroAssembler::DEBUG_BREAK_NOP);
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ASSERT_EQ(Assembler::kDebugBreakSlotInstructions,
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masm->InstructionsGeneratedSince(&check_codesize));
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void Debug::GenerateSlotDebugBreak(MacroAssembler* masm) {
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// In the places where a debug break slot is inserted no registers can contain
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Generate_DebugBreakCallHelper(masm, 0, 0);
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void Debug::GeneratePlainReturnLiveEdit(MacroAssembler* masm) {
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masm->Abort("LiveEdit frame dropping is not supported on ppc");
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void Debug::GenerateFrameDropperLiveEdit(MacroAssembler* masm) {
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masm->Abort("LiveEdit frame dropping is not supported on ppc");
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const bool Debug::kFrameDropperSupported = false;
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#endif // ENABLE_DEBUGGER_SUPPORT
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} } // namespace v8::internal
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#endif // V8_TARGET_ARCH_PPC
added
removed
src/ppc/debug-ppc.cc
