diff options
Diffstat (limited to 'js/src/jit/mips32/Trampoline-mips32.cpp')
| -rw-r--r-- | js/src/jit/mips32/Trampoline-mips32.cpp | 942 |
1 files changed, 942 insertions, 0 deletions
diff --git a/js/src/jit/mips32/Trampoline-mips32.cpp b/js/src/jit/mips32/Trampoline-mips32.cpp new file mode 100644 index 0000000000..2d49c865b5 --- /dev/null +++ b/js/src/jit/mips32/Trampoline-mips32.cpp @@ -0,0 +1,942 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- + * vim: set ts=8 sts=2 et sw=2 tw=80: + * This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +#include "mozilla/DebugOnly.h" + +#include "jit/Bailouts.h" +#include "jit/BaselineFrame.h" +#include "jit/CalleeToken.h" +#include "jit/JitFrames.h" +#include "jit/JitRuntime.h" +#include "jit/JitSpewer.h" +#include "jit/mips-shared/SharedICHelpers-mips-shared.h" +#include "jit/PerfSpewer.h" +#include "jit/VMFunctions.h" +#include "vm/JitActivation.h" // js::jit::JitActivation +#include "vm/JSContext.h" +#include "vm/Realm.h" + +#include "jit/MacroAssembler-inl.h" + +using namespace js; +using namespace js::jit; + +static_assert(sizeof(uintptr_t) == sizeof(uint32_t), "Not 64-bit clean."); + +struct EnterJITRegs { + double f30; + double f28; + double f26; + double f24; + double f22; + double f20; + + // non-volatile registers. + uintptr_t ra; + uintptr_t fp; + uintptr_t s7; + uintptr_t s6; + uintptr_t s5; + uintptr_t s4; + uintptr_t s3; + uintptr_t s2; + uintptr_t s1; + uintptr_t s0; +}; + +struct EnterJITArgs { + // First 4 argumet placeholders + void* jitcode; // <- sp points here when function is entered. + int maxArgc; + Value* maxArgv; + InterpreterFrame* fp; + + // Arguments on stack + CalleeToken calleeToken; + JSObject* scopeChain; + size_t numStackValues; + Value* vp; +}; + +static void GenerateReturn(MacroAssembler& masm, int returnCode) { + MOZ_ASSERT(masm.framePushed() == sizeof(EnterJITRegs)); + + // Restore non-volatile registers + masm.as_lw(s0, StackPointer, offsetof(EnterJITRegs, s0)); + masm.as_lw(s1, StackPointer, offsetof(EnterJITRegs, s1)); + masm.as_lw(s2, StackPointer, offsetof(EnterJITRegs, s2)); + masm.as_lw(s3, StackPointer, offsetof(EnterJITRegs, s3)); + masm.as_lw(s4, StackPointer, offsetof(EnterJITRegs, s4)); + masm.as_lw(s5, StackPointer, offsetof(EnterJITRegs, s5)); + masm.as_lw(s6, StackPointer, offsetof(EnterJITRegs, s6)); + masm.as_lw(s7, StackPointer, offsetof(EnterJITRegs, s7)); + masm.as_lw(fp, StackPointer, offsetof(EnterJITRegs, fp)); + masm.as_lw(ra, StackPointer, offsetof(EnterJITRegs, ra)); + + // Restore non-volatile floating point registers + masm.as_ldc1(f20, StackPointer, offsetof(EnterJITRegs, f20)); + masm.as_ldc1(f22, StackPointer, offsetof(EnterJITRegs, f22)); + masm.as_ldc1(f24, StackPointer, offsetof(EnterJITRegs, f24)); + masm.as_ldc1(f26, StackPointer, offsetof(EnterJITRegs, f26)); + masm.as_ldc1(f28, StackPointer, offsetof(EnterJITRegs, f28)); + masm.as_ldc1(f30, StackPointer, offsetof(EnterJITRegs, f30)); + + masm.freeStack(sizeof(EnterJITRegs)); + + masm.branch(ra); +} + +static void GeneratePrologue(MacroAssembler& masm) { + // Save non-volatile registers. These must be saved by the trampoline, + // rather than the JIT'd code, because they are scanned by the conservative + // scanner. + masm.reserveStack(sizeof(EnterJITRegs)); + masm.as_sw(s0, StackPointer, offsetof(EnterJITRegs, s0)); + masm.as_sw(s1, StackPointer, offsetof(EnterJITRegs, s1)); + masm.as_sw(s2, StackPointer, offsetof(EnterJITRegs, s2)); + masm.as_sw(s3, StackPointer, offsetof(EnterJITRegs, s3)); + masm.as_sw(s4, StackPointer, offsetof(EnterJITRegs, s4)); + masm.as_sw(s5, StackPointer, offsetof(EnterJITRegs, s5)); + masm.as_sw(s6, StackPointer, offsetof(EnterJITRegs, s6)); + masm.as_sw(s7, StackPointer, offsetof(EnterJITRegs, s7)); + masm.as_sw(fp, StackPointer, offsetof(EnterJITRegs, fp)); + masm.as_sw(ra, StackPointer, offsetof(EnterJITRegs, ra)); + + masm.as_sdc1(f20, StackPointer, offsetof(EnterJITRegs, f20)); + masm.as_sdc1(f22, StackPointer, offsetof(EnterJITRegs, f22)); + masm.as_sdc1(f24, StackPointer, offsetof(EnterJITRegs, f24)); + masm.as_sdc1(f26, StackPointer, offsetof(EnterJITRegs, f26)); + masm.as_sdc1(f28, StackPointer, offsetof(EnterJITRegs, f28)); + masm.as_sdc1(f30, StackPointer, offsetof(EnterJITRegs, f30)); +} + +/* + * This method generates a trampoline for a c++ function with the following + * signature: + * void enter(void* code, int argc, Value* argv, InterpreterFrame* fp, + * CalleeToken calleeToken, JSObject* scopeChain, Value* vp) + * ...using standard EABI calling convention + */ +void JitRuntime::generateEnterJIT(JSContext* cx, MacroAssembler& masm) { + enterJITOffset_ = startTrampolineCode(masm); + + const Register reg_code = a0; + const Register reg_argc = a1; + const Register reg_argv = a2; + const mozilla::DebugOnly<Register> reg_frame = a3; + + MOZ_ASSERT(OsrFrameReg == reg_frame); + + GeneratePrologue(masm); + + const Address slotToken( + sp, sizeof(EnterJITRegs) + offsetof(EnterJITArgs, calleeToken)); + const Address slotVp(sp, sizeof(EnterJITRegs) + offsetof(EnterJITArgs, vp)); + + // Save stack pointer into s4 + masm.movePtr(StackPointer, s4); + + // Load calleeToken into s2. + masm.loadPtr(slotToken, s2); + + // Save stack pointer as baseline frame. + masm.movePtr(StackPointer, FramePointer); + + // Load the number of actual arguments into s3. + masm.loadPtr(slotVp, s3); + masm.unboxInt32(Address(s3, 0), s3); + + /*************************************************************** + Loop over argv vector, push arguments onto stack in reverse order + ***************************************************************/ + + // if we are constructing, that also needs to include newTarget + { + Label noNewTarget; + masm.branchTest32(Assembler::Zero, s2, + Imm32(CalleeToken_FunctionConstructing), &noNewTarget); + + masm.add32(Imm32(1), reg_argc); + + masm.bind(&noNewTarget); + } + + masm.as_sll(s0, reg_argc, 3); // s0 = argc * 8 + masm.addPtr(reg_argv, s0); // s0 = argv + argc * 8 + + // Loop over arguments, copying them from an unknown buffer onto the Ion + // stack so they can be accessed from JIT'ed code. + Label header, footer; + // If there aren't any arguments, don't do anything + masm.ma_b(s0, reg_argv, &footer, Assembler::BelowOrEqual, ShortJump); + { + masm.bind(&header); + + masm.subPtr(Imm32(2 * sizeof(uintptr_t)), s0); + masm.subPtr(Imm32(2 * sizeof(uintptr_t)), StackPointer); + + ValueOperand value = ValueOperand(s6, s7); + masm.loadValue(Address(s0, 0), value); + masm.storeValue(value, Address(StackPointer, 0)); + + masm.ma_b(s0, reg_argv, &header, Assembler::Above, ShortJump); + } + masm.bind(&footer); + + // Create the frame descriptor. + masm.subPtr(StackPointer, s4); + masm.makeFrameDescriptor(s4, FrameType::CppToJSJit, JitFrameLayout::Size()); + + masm.subPtr(Imm32(2 * sizeof(uintptr_t)), StackPointer); + masm.storePtr(s3, + Address(StackPointer, sizeof(uintptr_t))); // actual arguments + masm.storePtr(s2, Address(StackPointer, 0)); // callee token + + masm.push(s4); // descriptor + + CodeLabel returnLabel; + Label oomReturnLabel; + { + // Handle Interpreter -> Baseline OSR. + AllocatableGeneralRegisterSet regs(GeneralRegisterSet::All()); + MOZ_ASSERT(!regs.has(FramePointer)); + regs.take(OsrFrameReg); + regs.take(reg_code); + regs.take(ReturnReg); + + const Address slotNumStackValues( + FramePointer, + sizeof(EnterJITRegs) + offsetof(EnterJITArgs, numStackValues)); + const Address slotScopeChain( + FramePointer, + sizeof(EnterJITRegs) + offsetof(EnterJITArgs, scopeChain)); + + Label notOsr; + masm.ma_b(OsrFrameReg, OsrFrameReg, ¬Osr, Assembler::Zero, ShortJump); + + Register scratch = regs.takeAny(); + + Register numStackValues = regs.takeAny(); + masm.load32(slotNumStackValues, numStackValues); + + // Push return address. + masm.subPtr(Imm32(sizeof(uintptr_t)), StackPointer); + masm.ma_li(scratch, &returnLabel); + masm.storePtr(scratch, Address(StackPointer, 0)); + + // Push previous frame pointer. + masm.subPtr(Imm32(sizeof(uintptr_t)), StackPointer); + masm.storePtr(FramePointer, Address(StackPointer, 0)); + + // Reserve frame. + Register framePtr = FramePointer; + masm.subPtr(Imm32(BaselineFrame::Size()), StackPointer); + masm.movePtr(StackPointer, framePtr); + + // Reserve space for locals and stack values. + masm.ma_sll(scratch, numStackValues, Imm32(3)); + masm.subPtr(scratch, StackPointer); + + // Enter exit frame. + masm.addPtr( + Imm32(BaselineFrame::Size() + BaselineFrame::FramePointerOffset), + scratch); + masm.makeFrameDescriptor(scratch, FrameType::BaselineJS, + ExitFrameLayout::Size()); + + // Push frame descriptor and fake return address. + masm.reserveStack(2 * sizeof(uintptr_t)); + masm.storePtr( + scratch, Address(StackPointer, sizeof(uintptr_t))); // Frame descriptor + masm.storePtr(zero, Address(StackPointer, 0)); // fake return address + + // No GC things to mark, push a bare token. + masm.loadJSContext(scratch); + masm.enterFakeExitFrame(scratch, scratch, ExitFrameType::Bare); + + masm.reserveStack(2 * sizeof(uintptr_t)); + masm.storePtr(framePtr, + Address(StackPointer, sizeof(uintptr_t))); // BaselineFrame + masm.storePtr(reg_code, Address(StackPointer, 0)); // jitcode + + using Fn = bool (*)(BaselineFrame * frame, InterpreterFrame * interpFrame, + uint32_t numStackValues); + masm.setupUnalignedABICall(scratch); + masm.passABIArg(FramePointer); // BaselineFrame + masm.passABIArg(OsrFrameReg); // InterpreterFrame + masm.passABIArg(numStackValues); + masm.callWithABI<Fn, jit::InitBaselineFrameForOsr>( + MoveOp::GENERAL, CheckUnsafeCallWithABI::DontCheckHasExitFrame); + + regs.add(OsrFrameReg); + regs.take(JSReturnOperand); + Register jitcode = regs.takeAny(); + masm.loadPtr(Address(StackPointer, 0), jitcode); + masm.loadPtr(Address(StackPointer, sizeof(uintptr_t)), framePtr); + masm.freeStack(2 * sizeof(uintptr_t)); + + Label error; + masm.freeStack(ExitFrameLayout::SizeWithFooter()); + masm.addPtr(Imm32(BaselineFrame::Size()), framePtr); + masm.branchIfFalseBool(ReturnReg, &error); + + // If OSR-ing, then emit instrumentation for setting lastProfilerFrame + // if profiler instrumentation is enabled. + { + Label skipProfilingInstrumentation; + Register realFramePtr = numStackValues; + AbsoluteAddress addressOfEnabled( + cx->runtime()->geckoProfiler().addressOfEnabled()); + masm.branch32(Assembler::Equal, addressOfEnabled, Imm32(0), + &skipProfilingInstrumentation); + masm.ma_addu(realFramePtr, framePtr, Imm32(sizeof(void*))); + masm.profilerEnterFrame(realFramePtr, scratch); + masm.bind(&skipProfilingInstrumentation); + } + + masm.jump(jitcode); + + // OOM: load error value, discard return address and previous frame + // pointer and return. + masm.bind(&error); + masm.movePtr(framePtr, StackPointer); + masm.addPtr(Imm32(2 * sizeof(uintptr_t)), StackPointer); + masm.moveValue(MagicValue(JS_ION_ERROR), JSReturnOperand); + masm.jump(&oomReturnLabel); + + masm.bind(¬Osr); + // Load the scope chain in R1. + MOZ_ASSERT(R1.scratchReg() != reg_code); + masm.loadPtr(slotScopeChain, R1.scratchReg()); + } + + // The call will push the return address on the stack, thus we check that + // the stack would be aligned once the call is complete. + masm.assertStackAlignment(JitStackAlignment, sizeof(uintptr_t)); + + // Call the function with pushing return address to stack. + masm.callJitNoProfiler(reg_code); + + { + // Interpreter -> Baseline OSR will return here. + masm.bind(&returnLabel); + masm.addCodeLabel(returnLabel); + masm.bind(&oomReturnLabel); + } + + // s0 <- 8*argc (size of all arguments we pushed on the stack) + masm.pop(s0); + masm.rshiftPtr(Imm32(FRAMESIZE_SHIFT), s0); + + // Discard calleeToken, numActualArgs. + masm.addPtr(Imm32(2 * sizeof(uintptr_t)), StackPointer); + + // Pop arguments off the stack. + masm.addPtr(s0, StackPointer); + + // Store the returned value into the slotVp + masm.loadPtr(slotVp, s1); + masm.storeValue(JSReturnOperand, Address(s1, 0)); + + // Restore non-volatile registers and return. + GenerateReturn(masm, ShortJump); +} + +// static +mozilla::Maybe<::JS::ProfilingFrameIterator::RegisterState> +JitRuntime::getCppEntryRegisters(JitFrameLayout* frameStackAddress) { + // Not supported, or not implemented yet. + // TODO: Implement along with the corresponding stack-walker changes, in + // coordination with the Gecko Profiler, see bug 1635987 and follow-ups. + return mozilla::Nothing{}; +} + +void JitRuntime::generateInvalidator(MacroAssembler& masm, Label* bailoutTail) { + invalidatorOffset_ = startTrampolineCode(masm); + + // NOTE: Members ionScript_ and osiPointReturnAddress_ of + // InvalidationBailoutStack are already on the stack. + static const uint32_t STACK_DATA_SIZE = + sizeof(InvalidationBailoutStack) - 2 * sizeof(uintptr_t); + + // Stack has to be alligned here. If not, we will have to fix it. + masm.checkStackAlignment(); + + // Make room for data on stack. + masm.subPtr(Imm32(STACK_DATA_SIZE), StackPointer); + + // Save general purpose registers + for (uint32_t i = 0; i < Registers::Total; i++) { + Address address = + Address(StackPointer, InvalidationBailoutStack::offsetOfRegs() + + i * sizeof(uintptr_t)); + masm.storePtr(Register::FromCode(i), address); + } + + // Save floating point registers + // We can use as_sd because stack is alligned. + for (uint32_t i = 0; i < FloatRegisters::TotalDouble; i++) { + masm.as_sdc1( + FloatRegister::FromIndex(i, FloatRegister::Double), StackPointer, + InvalidationBailoutStack::offsetOfFpRegs() + i * sizeof(double)); + } + + // Pass pointer to InvalidationBailoutStack structure. + masm.movePtr(StackPointer, a0); + + // Reserve place for return value and BailoutInfo pointer + masm.subPtr(Imm32(2 * sizeof(uintptr_t)), StackPointer); + // Pass pointer to return value. + masm.ma_addu(a1, StackPointer, Imm32(sizeof(uintptr_t))); + // Pass pointer to BailoutInfo + masm.movePtr(StackPointer, a2); + + using Fn = bool (*)(InvalidationBailoutStack * sp, size_t * frameSizeOut, + BaselineBailoutInfo * *info); + masm.setupAlignedABICall(); + masm.passABIArg(a0); + masm.passABIArg(a1); + masm.passABIArg(a2); + masm.callWithABI<Fn, InvalidationBailout>( + MoveOp::GENERAL, CheckUnsafeCallWithABI::DontCheckOther); + + masm.loadPtr(Address(StackPointer, 0), a2); + masm.loadPtr(Address(StackPointer, sizeof(uintptr_t)), a1); + // Remove the return address, the IonScript, the register state + // (InvaliationBailoutStack) and the space that was allocated for the + // return value. + masm.addPtr(Imm32(sizeof(InvalidationBailoutStack) + 2 * sizeof(uintptr_t)), + StackPointer); + // remove the space that this frame was using before the bailout + // (computed by InvalidationBailout) + masm.addPtr(a1, StackPointer); + + // Jump to shared bailout tail. The BailoutInfo pointer has to be in r2. + masm.jump(bailoutTail); +} + +void JitRuntime::generateArgumentsRectifier(MacroAssembler& masm, + ArgumentsRectifierKind kind) { + switch (kind) { + case ArgumentsRectifierKind::Normal: + argumentsRectifierOffset_ = startTrampolineCode(masm); + break; + case ArgumentsRectifierKind::TrialInlining: + trialInliningArgumentsRectifierOffset_ = startTrampolineCode(masm); + break; + } + masm.pushReturnAddress(); + +#error "Port changes from bug 1772506" + + Register numActArgsReg = t6; + Register calleeTokenReg = t7; + Register numArgsReg = t5; + + // Load the number of actual arguments into numActArgsReg + masm.loadPtr( + Address(StackPointer, RectifierFrameLayout::offsetOfNumActualArgs()), + numActArgsReg); + + // Load the number of |undefined|s to push into t1. + masm.loadPtr( + Address(StackPointer, RectifierFrameLayout::offsetOfCalleeToken()), + calleeTokenReg); + + // Copy the number of actual arguments into s3. + masm.mov(numActArgsReg, s3); + + masm.mov(calleeTokenReg, numArgsReg); + masm.andPtr(Imm32(CalleeTokenMask), numArgsReg); + masm.loadFunctionArgCount(numArgsReg, numArgsReg); + + masm.as_subu(t1, numArgsReg, s3); + + // Get the topmost argument. + masm.ma_sll(t0, s3, Imm32(3)); // t0 <- nargs * 8 + masm.as_addu(t2, sp, t0); // t2 <- sp + nargs * 8 + masm.addPtr(Imm32(sizeof(RectifierFrameLayout)), t2); + + { + Label notConstructing; + + masm.branchTest32(Assembler::Zero, calleeTokenReg, + Imm32(CalleeToken_FunctionConstructing), + ¬Constructing); + + // Add sizeof(Value) to overcome |this| + masm.subPtr(Imm32(sizeof(Value)), StackPointer); + masm.load32(Address(t2, NUNBOX32_TYPE_OFFSET + sizeof(Value)), t0); + masm.store32(t0, Address(StackPointer, NUNBOX32_TYPE_OFFSET)); + masm.load32(Address(t2, NUNBOX32_PAYLOAD_OFFSET + sizeof(Value)), t0); + masm.store32(t0, Address(StackPointer, NUNBOX32_PAYLOAD_OFFSET)); + + // Include the newly pushed newTarget value in the frame size + // calculated below. + masm.add32(Imm32(1), numArgsReg); + + masm.bind(¬Constructing); + } + + // Push undefined. + masm.moveValue(UndefinedValue(), ValueOperand(t3, t4)); + { + Label undefLoopTop; + masm.bind(&undefLoopTop); + + masm.subPtr(Imm32(sizeof(Value)), StackPointer); + masm.storeValue(ValueOperand(t3, t4), Address(StackPointer, 0)); + masm.sub32(Imm32(1), t1); + + masm.ma_b(t1, t1, &undefLoopTop, Assembler::NonZero, ShortJump); + } + + // Push arguments, |nargs| + 1 times (to include |this|). + { + Label copyLoopTop, initialSkip; + + masm.ma_b(&initialSkip, ShortJump); + + masm.bind(©LoopTop); + masm.subPtr(Imm32(sizeof(Value)), t2); + masm.sub32(Imm32(1), s3); + + masm.bind(&initialSkip); + + MOZ_ASSERT(sizeof(Value) == 2 * sizeof(uint32_t)); + // Read argument and push to stack. + masm.subPtr(Imm32(sizeof(Value)), StackPointer); + masm.load32(Address(t2, NUNBOX32_TYPE_OFFSET), t0); + masm.store32(t0, Address(StackPointer, NUNBOX32_TYPE_OFFSET)); + masm.load32(Address(t2, NUNBOX32_PAYLOAD_OFFSET), t0); + masm.store32(t0, Address(StackPointer, NUNBOX32_PAYLOAD_OFFSET)); + + masm.ma_b(s3, s3, ©LoopTop, Assembler::NonZero, ShortJump); + } + + // translate the framesize from values into bytes + masm.ma_addu(t0, numArgsReg, Imm32(1)); + masm.lshiftPtr(Imm32(3), t0); + + // Construct sizeDescriptor. + masm.makeFrameDescriptor(t0, FrameType::Rectifier, JitFrameLayout::Size()); + + // Construct JitFrameLayout. + masm.subPtr(Imm32(3 * sizeof(uintptr_t)), StackPointer); + // Push actual arguments. + masm.storePtr(numActArgsReg, Address(StackPointer, 2 * sizeof(uintptr_t))); + // Push callee token. + masm.storePtr(calleeTokenReg, Address(StackPointer, sizeof(uintptr_t))); + // Push frame descriptor. + masm.storePtr(t0, Address(StackPointer, 0)); + + // Call the target function. + masm.andPtr(Imm32(CalleeTokenMask), calleeTokenReg); + switch (kind) { + case ArgumentsRectifierKind::Normal: + masm.loadJitCodeRaw(calleeTokenReg, t1); + argumentsRectifierReturnOffset_ = masm.callJitNoProfiler(t1); + break; + case ArgumentsRectifierKind::TrialInlining: + Label noBaselineScript, done; + masm.loadBaselineJitCodeRaw(calleeTokenReg, t1, &noBaselineScript); + masm.callJitNoProfiler(t1); + masm.jump(&done); + + // See BaselineCacheIRCompiler::emitCallInlinedFunction. + masm.bind(&noBaselineScript); + masm.loadJitCodeRaw(calleeTokenReg, t1); + masm.callJitNoProfiler(t1); + masm.bind(&done); + break; + } + + masm.mov(FramePointer, StackPointer); + masm.pop(FramePointer); + masm.ret(); +} + +// NOTE: Members snapshotOffset_ and padding_ of BailoutStack +// are not stored in PushBailoutFrame(). +static const uint32_t bailoutDataSize = + sizeof(BailoutStack) - 2 * sizeof(uintptr_t); +static const uint32_t bailoutInfoOutParamSize = 2 * sizeof(uintptr_t); + +/* There are two different stack layouts when doing bailout. They are + * represented via class BailoutStack. + * + * - First case is when bailout is done trough bailout table. In this case + * table offset is stored in $ra (look at JitRuntime::generateBailoutTable()) + * and thunk code should save it on stack. In this case frameClassId_ cannot + * be NO_FRAME_SIZE_CLASS_ID. Members snapshotOffset_ and padding_ are not on + * the stack. + * + * - Other case is when bailout is done via out of line code (lazy bailout). + * In this case frame size is stored in $ra (look at + * CodeGeneratorMIPS::generateOutOfLineCode()) and thunk code should save it + * on stack. Other difference is that members snapshotOffset_ and padding_ are + * pushed to the stack by CodeGeneratorMIPS::visitOutOfLineBailout(). + */ +static void PushBailoutFrame(MacroAssembler& masm, Register spArg) { + // Make sure that alignment is proper. + masm.checkStackAlignment(); + + // Make room for data. + masm.subPtr(Imm32(bailoutDataSize), StackPointer); + + // Save general purpose registers. + for (uint32_t i = 0; i < Registers::Total; i++) { + uint32_t off = BailoutStack::offsetOfRegs() + i * sizeof(uintptr_t); + masm.storePtr(Register::FromCode(i), Address(StackPointer, off)); + } + +#ifdef ENABLE_WASM_SIMD + // What to do for SIMD? +# error "Needs more careful logic if SIMD is enabled" +#endif + + // Save floating point registers + // We can use as_sdc1 because stack is alligned. + for (uint32_t i = 0; i < FloatRegisters::TotalDouble; i++) { + masm.as_sdc1(FloatRegister::FromIndex(i, FloatRegister::Double), + StackPointer, + BailoutStack::offsetOfFpRegs() + i * sizeof(double)); + } + + // Store the frameSize_ stored in ra + // See: JitRuntime::generateBailoutTable() + // See: CodeGeneratorMIPS::generateOutOfLineCode() + masm.storePtr(ra, Address(StackPointer, BailoutStack::offsetOfFrameSize())); + +#error "Code needs to be updated" + + // Put pointer to BailoutStack as first argument to the Bailout() + masm.movePtr(StackPointer, spArg); +} + +static void GenerateBailoutThunk(MacroAssembler& masm, Label* bailoutTail) { + PushBailoutFrame(masm, a0); + + // Put pointer to BailoutInfo + masm.subPtr(Imm32(bailoutInfoOutParamSize), StackPointer); + masm.storePtr(ImmPtr(nullptr), Address(StackPointer, 0)); + masm.movePtr(StackPointer, a1); + + using Fn = bool (*)(BailoutStack * sp, BaselineBailoutInfo * *info); + masm.setupAlignedABICall(); + masm.passABIArg(a0); + masm.passABIArg(a1); + masm.callWithABI<Fn, Bailout>(MoveOp::GENERAL, + CheckUnsafeCallWithABI::DontCheckOther); + + // Get BailoutInfo pointer + masm.loadPtr(Address(StackPointer, 0), a2); + + // Remove both the bailout frame and the topmost Ion frame's stack. + + // Load frameSize from stack + masm.loadPtr(Address(StackPointer, bailoutInfoOutParamSize + + BailoutStack::offsetOfFrameSize()), + a1); + + // Remove complete BailoutStack class and data after it + masm.addPtr(Imm32(sizeof(BailoutStack) + bailoutInfoOutParamSize), + StackPointer); + // Remove frame size srom stack + masm.addPtr(a1, StackPointer); + + // Jump to shared bailout tail. The BailoutInfo pointer has to be in a2. + masm.jump(bailoutTail); +} + +JitRuntime::BailoutTable JitRuntime::generateBailoutTable(MacroAssembler& masm, + Label* bailoutTail, + uint32_t frameClass) { + uint32_t offset = startTrampolineCode(masm); + + Label bailout; + for (size_t i = 0; i < BAILOUT_TABLE_SIZE; i++) { + // Calculate offset to the end of table + int32_t offset = (BAILOUT_TABLE_SIZE - i) * BAILOUT_TABLE_ENTRY_SIZE; + + // We use the 'ra' as table offset later in GenerateBailoutThunk + masm.as_bal(BOffImm16(offset)); + masm.nop(); + } + masm.bind(&bailout); + + GenerateBailoutThunk(masm, frameClass, bailoutTail); + + return BailoutTable(offset, masm.currentOffset() - offset); +} + +void JitRuntime::generateBailoutHandler(MacroAssembler& masm, + Label* bailoutTail) { + bailoutHandlerOffset_ = startTrampolineCode(masm); + + GenerateBailoutThunk(masm, NO_FRAME_SIZE_CLASS_ID, bailoutTail); +} + +bool JitRuntime::generateVMWrapper(JSContext* cx, MacroAssembler& masm, + const VMFunctionData& f, DynFn nativeFun, + uint32_t* wrapperOffset) { + *wrapperOffset = startTrampolineCode(masm); + + // Avoid conflicts with argument registers while discarding the result after + // the function call. + AllocatableGeneralRegisterSet regs(Register::Codes::WrapperMask); + + static_assert( + (Register::Codes::VolatileMask & ~Register::Codes::WrapperMask) == 0, + "Wrapper register set should be a superset of Volatile register set."); + + // The context is the first argument; a0 is the first argument register. + Register cxreg = a0; + regs.take(cxreg); + + // If it isn't a tail call, then the return address needs to be saved + if (f.expectTailCall == NonTailCall) { + masm.pushReturnAddress(); + } + + // We're aligned to an exit frame, so link it up. + masm.loadJSContext(cxreg); + masm.enterExitFrame(cxreg, regs.getAny(), &f); + + // Save the base of the argument set stored on the stack. + Register argsBase = InvalidReg; + if (f.explicitArgs) { + argsBase = t1; // Use temporary register. + regs.take(argsBase); + masm.ma_addu(argsBase, StackPointer, + Imm32(ExitFrameLayout::SizeWithFooter())); + } + uint32_t framePushedBeforeAlignStack = masm.framePushed(); + masm.alignStackPointer(); + masm.setFramePushed(0); + + // Reserve space for the outparameter. Reserve sizeof(Value) for every + // case so that stack stays aligned. + uint32_t outParamSize = 0; + switch (f.outParam) { + case Type_Value: + outParamSize = sizeof(Value); + masm.reserveStack(outParamSize); + break; + + case Type_Handle: { + uint32_t pushed = masm.framePushed(); + masm.PushEmptyRooted(f.outParamRootType); + outParamSize = masm.framePushed() - pushed; + } break; + + case Type_Bool: + case Type_Int32: + MOZ_ASSERT(sizeof(uintptr_t) == sizeof(uint32_t)); + [[fallthrough]]; + case Type_Pointer: + outParamSize = sizeof(uintptr_t); + masm.reserveStack(outParamSize); + break; + + case Type_Double: + outParamSize = sizeof(double); + masm.reserveStack(outParamSize); + break; + default: + MOZ_ASSERT(f.outParam == Type_Void); + break; + } + + uint32_t outParamOffset = 0; + if (f.outParam != Type_Void) { + // Make sure that stack is double aligned after outParam. + MOZ_ASSERT(outParamSize <= sizeof(double)); + outParamOffset += sizeof(double) - outParamSize; + } + // Reserve stack for double sized args that are copied to be aligned. + outParamOffset += f.doubleByRefArgs() * sizeof(double); + + Register doubleArgs = t0; + masm.reserveStack(outParamOffset); + masm.movePtr(StackPointer, doubleArgs); + + masm.setupAlignedABICall(); + masm.passABIArg(cxreg); + + size_t argDisp = 0; + size_t doubleArgDisp = 0; + + // Copy any arguments. + for (uint32_t explicitArg = 0; explicitArg < f.explicitArgs; explicitArg++) { + switch (f.argProperties(explicitArg)) { + case VMFunctionData::WordByValue: + masm.passABIArg(MoveOperand(argsBase, argDisp), MoveOp::GENERAL); + argDisp += sizeof(uint32_t); + break; + case VMFunctionData::DoubleByValue: + // Values should be passed by reference, not by value, so we + // assert that the argument is a double-precision float. + MOZ_ASSERT(f.argPassedInFloatReg(explicitArg)); + masm.passABIArg(MoveOperand(argsBase, argDisp), MoveOp::DOUBLE); + argDisp += sizeof(double); + break; + case VMFunctionData::WordByRef: + masm.passABIArg( + MoveOperand(argsBase, argDisp, MoveOperand::Kind::EffectiveAddress), + MoveOp::GENERAL); + argDisp += sizeof(uint32_t); + break; + case VMFunctionData::DoubleByRef: + // Copy double sized argument to aligned place. + masm.ma_ldc1WordAligned(ScratchDoubleReg, argsBase, argDisp); + masm.as_sdc1(ScratchDoubleReg, doubleArgs, doubleArgDisp); + masm.passABIArg(MoveOperand(doubleArgs, doubleArgDisp, + MoveOperand::Kind::EffectiveAddress), + MoveOp::GENERAL); + doubleArgDisp += sizeof(double); + argDisp += sizeof(double); + break; + } + } + + MOZ_ASSERT_IF(f.outParam != Type_Void, doubleArgDisp + sizeof(double) == + outParamOffset + outParamSize); + + // Copy the implicit outparam, if any. + if (f.outParam != Type_Void) { + masm.passABIArg(MoveOperand(doubleArgs, outParamOffset, + MoveOperand::Kind::EffectiveAddress), + MoveOp::GENERAL); + } + + masm.callWithABI(nativeFun, MoveOp::GENERAL, + CheckUnsafeCallWithABI::DontCheckHasExitFrame); + + // Test for failure. + switch (f.failType()) { + case Type_Cell: + masm.branchTestPtr(Assembler::Zero, v0, v0, masm.failureLabel()); + break; + case Type_Bool: + // Called functions return bools, which are 0/false and non-zero/true + masm.branchIfFalseBool(v0, masm.failureLabel()); + break; + case Type_Void: + break; + default: + MOZ_CRASH("unknown failure kind"); + } + + masm.freeStack(outParamOffset); + + // Load the outparam and free any allocated stack. + switch (f.outParam) { + case Type_Handle: + masm.popRooted(f.outParamRootType, ReturnReg, JSReturnOperand); + break; + + case Type_Value: + masm.loadValue(Address(StackPointer, 0), JSReturnOperand); + masm.freeStack(sizeof(Value)); + break; + + case Type_Int32: + MOZ_ASSERT(sizeof(uintptr_t) == sizeof(uint32_t)); + [[fallthrough]]; + case Type_Pointer: + masm.load32(Address(StackPointer, 0), ReturnReg); + masm.freeStack(sizeof(uintptr_t)); + break; + + case Type_Bool: + masm.load8ZeroExtend(Address(StackPointer, 0), ReturnReg); + masm.freeStack(sizeof(uintptr_t)); + break; + + case Type_Double: + masm.as_ldc1(ReturnDoubleReg, StackPointer, 0); + masm.freeStack(sizeof(double)); + break; + + default: + MOZ_ASSERT(f.outParam == Type_Void); + break; + } + + masm.restoreStackPointer(); + masm.setFramePushed(framePushedBeforeAlignStack); + + masm.leaveExitFrame(); + masm.retn(Imm32(sizeof(ExitFrameLayout) + + f.explicitStackSlots() * sizeof(uintptr_t) + + f.extraValuesToPop * sizeof(Value))); + + return true; +} + +uint32_t JitRuntime::generatePreBarrier(JSContext* cx, MacroAssembler& masm, + MIRType type) { + uint32_t offset = startTrampolineCode(masm); + + MOZ_ASSERT(PreBarrierReg == a1); + Register temp1 = a0; + Register temp2 = a2; + Register temp3 = a3; + masm.push(temp1); + masm.push(temp2); + masm.push(temp3); + + Label noBarrier; + masm.emitPreBarrierFastPath(cx->runtime(), type, temp1, temp2, temp3, + &noBarrier); + + // Call into C++ to mark this GC thing. + masm.pop(temp3); + masm.pop(temp2); + masm.pop(temp1); + + LiveRegisterSet save; + save.set() = RegisterSet(GeneralRegisterSet(Registers::VolatileMask), + FloatRegisterSet(FloatRegisters::VolatileMask)); + save.add(ra); + masm.PushRegsInMask(save); + + masm.movePtr(ImmPtr(cx->runtime()), a0); + + masm.setupUnalignedABICall(a2); + masm.passABIArg(a0); + masm.passABIArg(a1); + masm.callWithABI(JitPreWriteBarrier(type)); + + save.take(AnyRegister(ra)); + masm.PopRegsInMask(save); + masm.ret(); + + masm.bind(&noBarrier); + masm.pop(temp3); + masm.pop(temp2); + masm.pop(temp1); + masm.abiret(); + + return offset; +} + +void JitRuntime::generateExceptionTailStub(MacroAssembler& masm, + Label* profilerExitTail) { + exceptionTailOffset_ = startTrampolineCode(masm); + + masm.bind(masm.failureLabel()); + masm.handleFailureWithHandlerTail(profilerExitTail); +} + +void JitRuntime::generateBailoutTailStub(MacroAssembler& masm, + Label* bailoutTail) { + bailoutTailOffset_ = startTrampolineCode(masm); + masm.bind(bailoutTail); + + masm.generateBailoutTail(a1, a2); +} |