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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* vim: set ts=8 sts=4 et sw=4 tw=99:
* 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/. */
#ifndef jit_mips64_Assembler_mips64_h
#define jit_mips64_Assembler_mips64_h
#include "jit/mips-shared/Assembler-mips-shared.h"
#include "jit/mips64/Architecture-mips64.h"
namespace js {
namespace jit {
static constexpr Register CallTempReg4 = a4;
static constexpr Register CallTempReg5 = a5;
static constexpr Register CallTempNonArgRegs[] = { t0, t1, t2, t3 };
static const uint32_t NumCallTempNonArgRegs = mozilla::ArrayLength(CallTempNonArgRegs);
class ABIArgGenerator
{
unsigned usedArgSlots_;
bool firstArgFloat;
ABIArg current_;
public:
ABIArgGenerator();
ABIArg next(MIRType argType);
ABIArg& current() { return current_; }
uint32_t stackBytesConsumedSoFar() const {
if (usedArgSlots_ <= 8)
return 0;
return (usedArgSlots_ - 8) * sizeof(int64_t);
}
};
static constexpr Register ABINonArgReg0 = t0;
static constexpr Register ABINonArgReg1 = t1;
static constexpr Register ABINonArgReg2 = t2;
static constexpr Register ABINonArgReturnReg0 = t0;
static constexpr Register ABINonArgReturnReg1 = t1;
// TLS pointer argument register for WebAssembly functions. This must not alias
// any other register used for passing function arguments or return values.
// Preserved by WebAssembly functions.
static constexpr Register WasmTlsReg = s5;
// Registers used for wasm table calls. These registers must be disjoint
// from the ABI argument registers, WasmTlsReg and each other.
static constexpr Register WasmTableCallScratchReg = ABINonArgReg0;
static constexpr Register WasmTableCallSigReg = ABINonArgReg1;
static constexpr Register WasmTableCallIndexReg = ABINonArgReg2;
static constexpr Register JSReturnReg = v1;
static constexpr Register JSReturnReg_Type = JSReturnReg;
static constexpr Register JSReturnReg_Data = JSReturnReg;
static constexpr Register64 ReturnReg64(ReturnReg);
static constexpr FloatRegister ReturnFloat32Reg = { FloatRegisters::f0, FloatRegisters::Single };
static constexpr FloatRegister ReturnDoubleReg = { FloatRegisters::f0, FloatRegisters::Double };
static constexpr FloatRegister ScratchFloat32Reg = { FloatRegisters::f23, FloatRegisters::Single };
static constexpr FloatRegister ScratchDoubleReg = { FloatRegisters::f23, FloatRegisters::Double };
static constexpr FloatRegister SecondScratchFloat32Reg = { FloatRegisters::f21, FloatRegisters::Single };
static constexpr FloatRegister SecondScratchDoubleReg = { FloatRegisters::f21, FloatRegisters::Double };
// Registers used in the GenerateFFIIonExit Disable Activation block.
// None of these may be the second scratch register (t8).
static constexpr Register WasmIonExitRegReturnData = JSReturnReg_Data;
static constexpr Register WasmIonExitRegReturnType = JSReturnReg_Type;
static constexpr FloatRegister f0 = { FloatRegisters::f0, FloatRegisters::Double };
static constexpr FloatRegister f1 = { FloatRegisters::f1, FloatRegisters::Double };
static constexpr FloatRegister f2 = { FloatRegisters::f2, FloatRegisters::Double };
static constexpr FloatRegister f3 = { FloatRegisters::f3, FloatRegisters::Double };
static constexpr FloatRegister f4 = { FloatRegisters::f4, FloatRegisters::Double };
static constexpr FloatRegister f5 = { FloatRegisters::f5, FloatRegisters::Double };
static constexpr FloatRegister f6 = { FloatRegisters::f6, FloatRegisters::Double };
static constexpr FloatRegister f7 = { FloatRegisters::f7, FloatRegisters::Double };
static constexpr FloatRegister f8 = { FloatRegisters::f8, FloatRegisters::Double };
static constexpr FloatRegister f9 = { FloatRegisters::f9, FloatRegisters::Double };
static constexpr FloatRegister f10 = { FloatRegisters::f10, FloatRegisters::Double };
static constexpr FloatRegister f11 = { FloatRegisters::f11, FloatRegisters::Double };
static constexpr FloatRegister f12 = { FloatRegisters::f12, FloatRegisters::Double };
static constexpr FloatRegister f13 = { FloatRegisters::f13, FloatRegisters::Double };
static constexpr FloatRegister f14 = { FloatRegisters::f14, FloatRegisters::Double };
static constexpr FloatRegister f15 = { FloatRegisters::f15, FloatRegisters::Double };
static constexpr FloatRegister f16 = { FloatRegisters::f16, FloatRegisters::Double };
static constexpr FloatRegister f17 = { FloatRegisters::f17, FloatRegisters::Double };
static constexpr FloatRegister f18 = { FloatRegisters::f18, FloatRegisters::Double };
static constexpr FloatRegister f19 = { FloatRegisters::f19, FloatRegisters::Double };
static constexpr FloatRegister f20 = { FloatRegisters::f20, FloatRegisters::Double };
static constexpr FloatRegister f21 = { FloatRegisters::f21, FloatRegisters::Double };
static constexpr FloatRegister f22 = { FloatRegisters::f22, FloatRegisters::Double };
static constexpr FloatRegister f23 = { FloatRegisters::f23, FloatRegisters::Double };
static constexpr FloatRegister f24 = { FloatRegisters::f24, FloatRegisters::Double };
static constexpr FloatRegister f25 = { FloatRegisters::f25, FloatRegisters::Double };
static constexpr FloatRegister f26 = { FloatRegisters::f26, FloatRegisters::Double };
static constexpr FloatRegister f27 = { FloatRegisters::f27, FloatRegisters::Double };
static constexpr FloatRegister f28 = { FloatRegisters::f28, FloatRegisters::Double };
static constexpr FloatRegister f29 = { FloatRegisters::f29, FloatRegisters::Double };
static constexpr FloatRegister f30 = { FloatRegisters::f30, FloatRegisters::Double };
static constexpr FloatRegister f31 = { FloatRegisters::f31, FloatRegisters::Double };
// MIPS64 CPUs can only load multibyte data that is "naturally"
// eight-byte-aligned, sp register should be sixteen-byte-aligned.
static constexpr uint32_t ABIStackAlignment = 16;
static constexpr uint32_t JitStackAlignment = 16;
static constexpr uint32_t JitStackValueAlignment = JitStackAlignment / sizeof(Value);
static_assert(JitStackAlignment % sizeof(Value) == 0 && JitStackValueAlignment >= 1,
"Stack alignment should be a non-zero multiple of sizeof(Value)");
// TODO this is just a filler to prevent a build failure. The MIPS SIMD
// alignment requirements still need to be explored.
// TODO Copy the static_asserts from x64/x86 assembler files.
static constexpr uint32_t SimdMemoryAlignment = 16;
static constexpr uint32_t WasmStackAlignment = SimdMemoryAlignment;
// Does this architecture support SIMD conversions between Uint32x4 and Float32x4?
static constexpr bool SupportsUint32x4FloatConversions = false;
// Does this architecture support comparisons of unsigned integer vectors?
static constexpr bool SupportsUint8x16Compares = false;
static constexpr bool SupportsUint16x8Compares = false;
static constexpr bool SupportsUint32x4Compares = false;
static constexpr Scale ScalePointer = TimesEight;
class Assembler : public AssemblerMIPSShared
{
public:
Assembler()
: AssemblerMIPSShared()
{ }
// MacroAssemblers hold onto gcthings, so they are traced by the GC.
void trace(JSTracer* trc);
static uintptr_t GetPointer(uint8_t*);
void Bind(uint8_t* rawCode, CodeOffset* label, const void* address);
static void TraceJumpRelocations(JSTracer* trc, JitCode* code, CompactBufferReader& reader);
static void TraceDataRelocations(JSTracer* trc, JitCode* code, CompactBufferReader& reader);
static uint32_t PatchWrite_NearCallSize();
static uint64_t ExtractLoad64Value(Instruction* inst0);
static void UpdateLoad64Value(Instruction* inst0, uint64_t value);
static void WriteLoad64Instructions(Instruction* inst0, Register reg, uint64_t value);
static void PatchWrite_NearCall(CodeLocationLabel start, CodeLocationLabel toCall);
static void PatchDataWithValueCheck(CodeLocationLabel label, ImmPtr newValue,
ImmPtr expectedValue);
static void PatchDataWithValueCheck(CodeLocationLabel label, PatchedImmPtr newValue,
PatchedImmPtr expectedValue);
static void PatchInstructionImmediate(uint8_t* code, PatchedImmPtr imm);
static uint64_t ExtractInstructionImmediate(uint8_t* code);
static void ToggleCall(CodeLocationLabel inst_, bool enabled);
}; // Assembler
static const uint32_t NumIntArgRegs = 8;
static const uint32_t NumFloatArgRegs = NumIntArgRegs;
static inline bool
GetIntArgReg(uint32_t usedArgSlots, Register* out)
{
if (usedArgSlots < NumIntArgRegs) {
*out = Register::FromCode(a0.code() + usedArgSlots);
return true;
}
return false;
}
static inline bool
GetFloatArgReg(uint32_t usedArgSlots, FloatRegister* out)
{
if (usedArgSlots < NumFloatArgRegs) {
*out = FloatRegister::FromCode(f12.code() + usedArgSlots);
return true;
}
return false;
}
// Get a register in which we plan to put a quantity that will be used as an
// integer argument. This differs from GetIntArgReg in that if we have no more
// actual argument registers to use we will fall back on using whatever
// CallTempReg* don't overlap the argument registers, and only fail once those
// run out too.
static inline bool
GetTempRegForIntArg(uint32_t usedIntArgs, uint32_t usedFloatArgs, Register* out)
{
// NOTE: We can't properly determine which regs are used if there are
// float arguments. If this is needed, we will have to guess.
MOZ_ASSERT(usedFloatArgs == 0);
if (GetIntArgReg(usedIntArgs, out))
return true;
// Unfortunately, we have to assume things about the point at which
// GetIntArgReg returns false, because we need to know how many registers it
// can allocate.
usedIntArgs -= NumIntArgRegs;
if (usedIntArgs >= NumCallTempNonArgRegs)
return false;
*out = CallTempNonArgRegs[usedIntArgs];
return true;
}
static inline uint32_t
GetArgStackDisp(uint32_t usedArgSlots)
{
MOZ_ASSERT(usedArgSlots >= NumIntArgRegs);
return (usedArgSlots - NumIntArgRegs) * sizeof(int64_t);
}
} // namespace jit
} // namespace js
#endif /* jit_mips64_Assembler_mips64_h */
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