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-rw-r--r--js/src/jit/mips32/Trampoline-mips32.cpp942
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
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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, &notOsr, 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(&notOsr);
+ // 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),
+ &notConstructing);
+
+ // 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(&notConstructing);
+ }
+
+ // 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(&copyLoopTop);
+ 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, &copyLoopTop, 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);
+}