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Diffstat (limited to 'js/src/jit/arm64/vixl/Simulator-vixl.cpp')
| -rw-r--r-- | js/src/jit/arm64/vixl/Simulator-vixl.cpp | 4371 |
1 files changed, 4371 insertions, 0 deletions
diff --git a/js/src/jit/arm64/vixl/Simulator-vixl.cpp b/js/src/jit/arm64/vixl/Simulator-vixl.cpp new file mode 100644 index 0000000000..71e1a31d46 --- /dev/null +++ b/js/src/jit/arm64/vixl/Simulator-vixl.cpp @@ -0,0 +1,4371 @@ +// Copyright 2015, VIXL authors +// All rights reserved. +// +// Redistribution and use in source and binary forms, with or without +// modification, are permitted provided that the following conditions are met: +// +// * Redistributions of source code must retain the above copyright notice, +// this list of conditions and the following disclaimer. +// * Redistributions in binary form must reproduce the above copyright notice, +// this list of conditions and the following disclaimer in the documentation +// and/or other materials provided with the distribution. +// * Neither the name of ARM Limited nor the names of its contributors may be +// used to endorse or promote products derived from this software without +// specific prior written permission. +// +// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS CONTRIBUTORS "AS IS" AND +// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED +// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE +// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE +// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL +// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR +// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER +// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, +// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + +#include "jstypes.h" + +#ifdef JS_SIMULATOR_ARM64 + +#include "jit/arm64/vixl/Simulator-vixl.h" + +#include <cmath> +#include <string.h> + +#include "jit/AtomicOperations.h" + +namespace vixl { + +const Instruction* Simulator::kEndOfSimAddress = NULL; + +void SimSystemRegister::SetBits(int msb, int lsb, uint32_t bits) { + int width = msb - lsb + 1; + VIXL_ASSERT(IsUintN(width, bits) || IsIntN(width, bits)); + + bits <<= lsb; + uint32_t mask = ((1 << width) - 1) << lsb; + VIXL_ASSERT((mask & write_ignore_mask_) == 0); + + value_ = (value_ & ~mask) | (bits & mask); +} + + +SimSystemRegister SimSystemRegister::DefaultValueFor(SystemRegister id) { + switch (id) { + case NZCV: + return SimSystemRegister(0x00000000, NZCVWriteIgnoreMask); + case FPCR: + return SimSystemRegister(0x00000000, FPCRWriteIgnoreMask); + default: + VIXL_UNREACHABLE(); + return SimSystemRegister(); + } +} + + +void Simulator::Run() { + pc_modified_ = false; + while (pc_ != kEndOfSimAddress) { + ExecuteInstruction(); + LogAllWrittenRegisters(); + } +} + + +void Simulator::RunFrom(const Instruction* first) { + set_pc(first); + Run(); +} + + +const char* Simulator::xreg_names[] = { +"x0", "x1", "x2", "x3", "x4", "x5", "x6", "x7", +"x8", "x9", "x10", "x11", "x12", "x13", "x14", "x15", +"x16", "x17", "x18", "x19", "x20", "x21", "x22", "x23", +"x24", "x25", "x26", "x27", "x28", "x29", "lr", "xzr", "sp"}; + +const char* Simulator::wreg_names[] = { +"w0", "w1", "w2", "w3", "w4", "w5", "w6", "w7", +"w8", "w9", "w10", "w11", "w12", "w13", "w14", "w15", +"w16", "w17", "w18", "w19", "w20", "w21", "w22", "w23", +"w24", "w25", "w26", "w27", "w28", "w29", "w30", "wzr", "wsp"}; + +const char* Simulator::sreg_names[] = { +"s0", "s1", "s2", "s3", "s4", "s5", "s6", "s7", +"s8", "s9", "s10", "s11", "s12", "s13", "s14", "s15", +"s16", "s17", "s18", "s19", "s20", "s21", "s22", "s23", +"s24", "s25", "s26", "s27", "s28", "s29", "s30", "s31"}; + +const char* Simulator::dreg_names[] = { +"d0", "d1", "d2", "d3", "d4", "d5", "d6", "d7", +"d8", "d9", "d10", "d11", "d12", "d13", "d14", "d15", +"d16", "d17", "d18", "d19", "d20", "d21", "d22", "d23", +"d24", "d25", "d26", "d27", "d28", "d29", "d30", "d31"}; + +const char* Simulator::vreg_names[] = { +"v0", "v1", "v2", "v3", "v4", "v5", "v6", "v7", +"v8", "v9", "v10", "v11", "v12", "v13", "v14", "v15", +"v16", "v17", "v18", "v19", "v20", "v21", "v22", "v23", +"v24", "v25", "v26", "v27", "v28", "v29", "v30", "v31"}; + + + +const char* Simulator::WRegNameForCode(unsigned code, Reg31Mode mode) { + VIXL_ASSERT(code < kNumberOfRegisters); + // If the code represents the stack pointer, index the name after zr. + if ((code == kZeroRegCode) && (mode == Reg31IsStackPointer)) { + code = kZeroRegCode + 1; + } + return wreg_names[code]; +} + + +const char* Simulator::XRegNameForCode(unsigned code, Reg31Mode mode) { + VIXL_ASSERT(code < kNumberOfRegisters); + // If the code represents the stack pointer, index the name after zr. + if ((code == kZeroRegCode) && (mode == Reg31IsStackPointer)) { + code = kZeroRegCode + 1; + } + return xreg_names[code]; +} + + +const char* Simulator::SRegNameForCode(unsigned code) { + VIXL_ASSERT(code < kNumberOfFPRegisters); + return sreg_names[code]; +} + + +const char* Simulator::DRegNameForCode(unsigned code) { + VIXL_ASSERT(code < kNumberOfFPRegisters); + return dreg_names[code]; +} + + +const char* Simulator::VRegNameForCode(unsigned code) { + VIXL_ASSERT(code < kNumberOfVRegisters); + return vreg_names[code]; +} + + +#define COLOUR(colour_code) "\033[0;" colour_code "m" +#define COLOUR_BOLD(colour_code) "\033[1;" colour_code "m" +#define NORMAL "" +#define GREY "30" +#define RED "31" +#define GREEN "32" +#define YELLOW "33" +#define BLUE "34" +#define MAGENTA "35" +#define CYAN "36" +#define WHITE "37" +void Simulator::set_coloured_trace(bool value) { + coloured_trace_ = value; + + clr_normal = value ? COLOUR(NORMAL) : ""; + clr_flag_name = value ? COLOUR_BOLD(WHITE) : ""; + clr_flag_value = value ? COLOUR(NORMAL) : ""; + clr_reg_name = value ? COLOUR_BOLD(CYAN) : ""; + clr_reg_value = value ? COLOUR(CYAN) : ""; + clr_vreg_name = value ? COLOUR_BOLD(MAGENTA) : ""; + clr_vreg_value = value ? COLOUR(MAGENTA) : ""; + clr_memory_address = value ? COLOUR_BOLD(BLUE) : ""; + clr_warning = value ? COLOUR_BOLD(YELLOW) : ""; + clr_warning_message = value ? COLOUR(YELLOW) : ""; + clr_printf = value ? COLOUR(GREEN) : ""; +} +#undef COLOUR +#undef COLOUR_BOLD +#undef NORMAL +#undef GREY +#undef RED +#undef GREEN +#undef YELLOW +#undef BLUE +#undef MAGENTA +#undef CYAN +#undef WHITE + + +void Simulator::set_trace_parameters(int parameters) { + bool disasm_before = trace_parameters_ & LOG_DISASM; + trace_parameters_ = parameters; + bool disasm_after = trace_parameters_ & LOG_DISASM; + + if (disasm_before != disasm_after) { + if (disasm_after) { + decoder_->InsertVisitorBefore(print_disasm_, this); + } else { + decoder_->RemoveVisitor(print_disasm_); + } + } +} + + +void Simulator::set_instruction_stats(bool value) { + if (instrumentation_ == nullptr) { + return; + } + + if (value != instruction_stats_) { + if (value) { + decoder_->AppendVisitor(instrumentation_); + } else { + decoder_->RemoveVisitor(instrumentation_); + } + instruction_stats_ = value; + } +} + +// Helpers --------------------------------------------------------------------- +uint64_t Simulator::AddWithCarry(unsigned reg_size, + bool set_flags, + uint64_t left, + uint64_t right, + int carry_in) { + VIXL_ASSERT((carry_in == 0) || (carry_in == 1)); + VIXL_ASSERT((reg_size == kXRegSize) || (reg_size == kWRegSize)); + + uint64_t max_uint = (reg_size == kWRegSize) ? kWMaxUInt : kXMaxUInt; + uint64_t reg_mask = (reg_size == kWRegSize) ? kWRegMask : kXRegMask; + uint64_t sign_mask = (reg_size == kWRegSize) ? kWSignMask : kXSignMask; + + left &= reg_mask; + right &= reg_mask; + uint64_t result = (left + right + carry_in) & reg_mask; + + if (set_flags) { + nzcv().SetN(CalcNFlag(result, reg_size)); + nzcv().SetZ(CalcZFlag(result)); + + // Compute the C flag by comparing the result to the max unsigned integer. + uint64_t max_uint_2op = max_uint - carry_in; + bool C = (left > max_uint_2op) || ((max_uint_2op - left) < right); + nzcv().SetC(C ? 1 : 0); + + // Overflow iff the sign bit is the same for the two inputs and different + // for the result. + uint64_t left_sign = left & sign_mask; + uint64_t right_sign = right & sign_mask; + uint64_t result_sign = result & sign_mask; + bool V = (left_sign == right_sign) && (left_sign != result_sign); + nzcv().SetV(V ? 1 : 0); + + LogSystemRegister(NZCV); + } + return result; +} + + +int64_t Simulator::ShiftOperand(unsigned reg_size, + int64_t value, + Shift shift_type, + unsigned amount) { + if (amount == 0) { + return value; + } + int64_t mask = reg_size == kXRegSize ? kXRegMask : kWRegMask; + switch (shift_type) { + case LSL: + return (value << amount) & mask; + case LSR: + return static_cast<uint64_t>(value) >> amount; + case ASR: { + // Shift used to restore the sign. + unsigned s_shift = kXRegSize - reg_size; + // Value with its sign restored. + int64_t s_value = (value << s_shift) >> s_shift; + return (s_value >> amount) & mask; + } + case ROR: { + if (reg_size == kWRegSize) { + value &= kWRegMask; + } + return (static_cast<uint64_t>(value) >> amount) | + ((value & ((INT64_C(1) << amount) - 1)) << + (reg_size - amount)); + } + default: + VIXL_UNIMPLEMENTED(); + return 0; + } +} + + +int64_t Simulator::ExtendValue(unsigned reg_size, + int64_t value, + Extend extend_type, + unsigned left_shift) { + switch (extend_type) { + case UXTB: + value &= kByteMask; + break; + case UXTH: + value &= kHalfWordMask; + break; + case UXTW: + value &= kWordMask; + break; + case SXTB: + value = (value << 56) >> 56; + break; + case SXTH: + value = (value << 48) >> 48; + break; + case SXTW: + value = (value << 32) >> 32; + break; + case UXTX: + case SXTX: + break; + default: + VIXL_UNREACHABLE(); + } + int64_t mask = (reg_size == kXRegSize) ? kXRegMask : kWRegMask; + return (value << left_shift) & mask; +} + + +void Simulator::FPCompare(double val0, double val1, FPTrapFlags trap) { + AssertSupportedFPCR(); + + // TODO: This assumes that the C++ implementation handles comparisons in the + // way that we expect (as per AssertSupportedFPCR()). + bool process_exception = false; + if ((std::isnan(val0) != 0) || (std::isnan(val1) != 0)) { + nzcv().SetRawValue(FPUnorderedFlag); + if (IsSignallingNaN(val0) || IsSignallingNaN(val1) || + (trap == EnableTrap)) { + process_exception = true; + } + } else if (val0 < val1) { + nzcv().SetRawValue(FPLessThanFlag); + } else if (val0 > val1) { + nzcv().SetRawValue(FPGreaterThanFlag); + } else if (val0 == val1) { + nzcv().SetRawValue(FPEqualFlag); + } else { + VIXL_UNREACHABLE(); + } + LogSystemRegister(NZCV); + if (process_exception) FPProcessException(); +} + + +Simulator::PrintRegisterFormat Simulator::GetPrintRegisterFormatForSize( + unsigned reg_size, unsigned lane_size) { + VIXL_ASSERT(reg_size >= lane_size); + + uint32_t format = 0; + if (reg_size != lane_size) { + switch (reg_size) { + default: VIXL_UNREACHABLE(); break; + case kQRegSizeInBytes: format = kPrintRegAsQVector; break; + case kDRegSizeInBytes: format = kPrintRegAsDVector; break; + } + } + + switch (lane_size) { + default: VIXL_UNREACHABLE(); break; + case kQRegSizeInBytes: format |= kPrintReg1Q; break; + case kDRegSizeInBytes: format |= kPrintReg1D; break; + case kSRegSizeInBytes: format |= kPrintReg1S; break; + case kHRegSizeInBytes: format |= kPrintReg1H; break; + case kBRegSizeInBytes: format |= kPrintReg1B; break; + } + // These sizes would be duplicate case labels. + VIXL_STATIC_ASSERT(kXRegSizeInBytes == kDRegSizeInBytes); + VIXL_STATIC_ASSERT(kWRegSizeInBytes == kSRegSizeInBytes); + VIXL_STATIC_ASSERT(kPrintXReg == kPrintReg1D); + VIXL_STATIC_ASSERT(kPrintWReg == kPrintReg1S); + + return static_cast<PrintRegisterFormat>(format); +} + + +Simulator::PrintRegisterFormat Simulator::GetPrintRegisterFormat( + VectorFormat vform) { + switch (vform) { + default: VIXL_UNREACHABLE(); return kPrintReg16B; + case kFormat16B: return kPrintReg16B; + case kFormat8B: return kPrintReg8B; + case kFormat8H: return kPrintReg8H; + case kFormat4H: return kPrintReg4H; + case kFormat4S: return kPrintReg4S; + case kFormat2S: return kPrintReg2S; + case kFormat2D: return kPrintReg2D; + case kFormat1D: return kPrintReg1D; + } +} + + +void Simulator::PrintWrittenRegisters() { + for (unsigned i = 0; i < kNumberOfRegisters; i++) { + if (registers_[i].WrittenSinceLastLog()) PrintRegister(i); + } +} + + +void Simulator::PrintWrittenVRegisters() { + for (unsigned i = 0; i < kNumberOfVRegisters; i++) { + // At this point there is no type information, so print as a raw 1Q. + if (vregisters_[i].WrittenSinceLastLog()) PrintVRegister(i, kPrintReg1Q); + } +} + + +void Simulator::PrintSystemRegisters() { + PrintSystemRegister(NZCV); + PrintSystemRegister(FPCR); +} + + +void Simulator::PrintRegisters() { + for (unsigned i = 0; i < kNumberOfRegisters; i++) { + PrintRegister(i); + } +} + + +void Simulator::PrintVRegisters() { + for (unsigned i = 0; i < kNumberOfVRegisters; i++) { + // At this point there is no type information, so print as a raw 1Q. + PrintVRegister(i, kPrintReg1Q); + } +} + + +// Print a register's name and raw value. +// +// Only the least-significant `size_in_bytes` bytes of the register are printed, +// but the value is aligned as if the whole register had been printed. +// +// For typical register updates, size_in_bytes should be set to kXRegSizeInBytes +// -- the default -- so that the whole register is printed. Other values of +// size_in_bytes are intended for use when the register hasn't actually been +// updated (such as in PrintWrite). +// +// No newline is printed. This allows the caller to print more details (such as +// a memory access annotation). +void Simulator::PrintRegisterRawHelper(unsigned code, Reg31Mode r31mode, + int size_in_bytes) { + // The template for all supported sizes. + // "# x{code}: 0xffeeddccbbaa9988" + // "# w{code}: 0xbbaa9988" + // "# w{code}<15:0>: 0x9988" + // "# w{code}<7:0>: 0x88" + unsigned padding_chars = (kXRegSizeInBytes - size_in_bytes) * 2; + + const char * name = ""; + const char * suffix = ""; + switch (size_in_bytes) { + case kXRegSizeInBytes: name = XRegNameForCode(code, r31mode); break; + case kWRegSizeInBytes: name = WRegNameForCode(code, r31mode); break; + case 2: + name = WRegNameForCode(code, r31mode); + suffix = "<15:0>"; + padding_chars -= strlen(suffix); + break; + case 1: + name = WRegNameForCode(code, r31mode); + suffix = "<7:0>"; + padding_chars -= strlen(suffix); + break; + default: + VIXL_UNREACHABLE(); + } + fprintf(stream_, "# %s%5s%s: ", clr_reg_name, name, suffix); + + // Print leading padding spaces. + VIXL_ASSERT(padding_chars < (kXRegSizeInBytes * 2)); + for (unsigned i = 0; i < padding_chars; i++) { + putc(' ', stream_); + } + + // Print the specified bits in hexadecimal format. + uint64_t bits = reg<uint64_t>(code, r31mode); + bits &= kXRegMask >> ((kXRegSizeInBytes - size_in_bytes) * 8); + VIXL_STATIC_ASSERT(sizeof(bits) == kXRegSizeInBytes); + + int chars = size_in_bytes * 2; + fprintf(stream_, "%s0x%0*" PRIx64 "%s", + clr_reg_value, chars, bits, clr_normal); +} + + +void Simulator::PrintRegister(unsigned code, Reg31Mode r31mode) { + registers_[code].NotifyRegisterLogged(); + + // Don't print writes into xzr. + if ((code == kZeroRegCode) && (r31mode == Reg31IsZeroRegister)) { + return; + } + + // The template for all x and w registers: + // "# x{code}: 0x{value}" + // "# w{code}: 0x{value}" + + PrintRegisterRawHelper(code, r31mode); + fprintf(stream_, "\n"); +} + + +// Print a register's name and raw value. +// +// The `bytes` and `lsb` arguments can be used to limit the bytes that are +// printed. These arguments are intended for use in cases where register hasn't +// actually been updated (such as in PrintVWrite). +// +// No newline is printed. This allows the caller to print more details (such as +// a floating-point interpretation or a memory access annotation). +void Simulator::PrintVRegisterRawHelper(unsigned code, int bytes, int lsb) { + // The template for vector types: + // "# v{code}: 0xffeeddccbbaa99887766554433221100". + // An example with bytes=4 and lsb=8: + // "# v{code}: 0xbbaa9988 ". + fprintf(stream_, "# %s%5s: %s", + clr_vreg_name, VRegNameForCode(code), clr_vreg_value); + + int msb = lsb + bytes - 1; + int byte = kQRegSizeInBytes - 1; + + // Print leading padding spaces. (Two spaces per byte.) + while (byte > msb) { + fprintf(stream_, " "); + byte--; + } + + // Print the specified part of the value, byte by byte. + qreg_t rawbits = qreg(code); + fprintf(stream_, "0x"); + while (byte >= lsb) { + fprintf(stream_, "%02x", rawbits.val[byte]); + byte--; + } + + // Print trailing padding spaces. + while (byte >= 0) { + fprintf(stream_, " "); + byte--; + } + fprintf(stream_, "%s", clr_normal); +} + + +// Print each of the specified lanes of a register as a float or double value. +// +// The `lane_count` and `lslane` arguments can be used to limit the lanes that +// are printed. These arguments are intended for use in cases where register +// hasn't actually been updated (such as in PrintVWrite). +// +// No newline is printed. This allows the caller to print more details (such as +// a memory access annotation). +void Simulator::PrintVRegisterFPHelper(unsigned code, + unsigned lane_size_in_bytes, + int lane_count, + int rightmost_lane) { + VIXL_ASSERT((lane_size_in_bytes == kSRegSizeInBytes) || + (lane_size_in_bytes == kDRegSizeInBytes)); + + unsigned msb = ((lane_count + rightmost_lane) * lane_size_in_bytes); + VIXL_ASSERT(msb <= kQRegSizeInBytes); + + // For scalar types ((lane_count == 1) && (rightmost_lane == 0)), a register + // name is used: + // " (s{code}: {value})" + // " (d{code}: {value})" + // For vector types, "..." is used to represent one or more omitted lanes. + // " (..., {value}, {value}, ...)" + if ((lane_count == 1) && (rightmost_lane == 0)) { + const char * name = + (lane_size_in_bytes == kSRegSizeInBytes) ? SRegNameForCode(code) + : DRegNameForCode(code); + fprintf(stream_, " (%s%s: ", clr_vreg_name, name); + } else { + if (msb < (kQRegSizeInBytes - 1)) { + fprintf(stream_, " (..., "); + } else { + fprintf(stream_, " ("); + } + } + + // Print the list of values. + const char * separator = ""; + int leftmost_lane = rightmost_lane + lane_count - 1; + for (int lane = leftmost_lane; lane >= rightmost_lane; lane--) { + double value = + (lane_size_in_bytes == kSRegSizeInBytes) ? vreg(code).Get<float>(lane) + : vreg(code).Get<double>(lane); + fprintf(stream_, "%s%s%#g%s", separator, clr_vreg_value, value, clr_normal); + separator = ", "; + } + + if (rightmost_lane > 0) { + fprintf(stream_, ", ..."); + } + fprintf(stream_, ")"); +} + + +void Simulator::PrintVRegister(unsigned code, PrintRegisterFormat format) { + vregisters_[code].NotifyRegisterLogged(); + + int lane_size_log2 = format & kPrintRegLaneSizeMask; + + int reg_size_log2; + if (format & kPrintRegAsQVector) { + reg_size_log2 = kQRegSizeInBytesLog2; + } else if (format & kPrintRegAsDVector) { + reg_size_log2 = kDRegSizeInBytesLog2; + } else { + // Scalar types. + reg_size_log2 = lane_size_log2; + } + + int lane_count = 1 << (reg_size_log2 - lane_size_log2); + int lane_size = 1 << lane_size_log2; + + // The template for vector types: + // "# v{code}: 0x{rawbits} (..., {value}, ...)". + // The template for scalar types: + // "# v{code}: 0x{rawbits} ({reg}:{value})". + // The values in parentheses after the bit representations are floating-point + // interpretations. They are displayed only if the kPrintVRegAsFP bit is set. + + PrintVRegisterRawHelper(code); + if (format & kPrintRegAsFP) { + PrintVRegisterFPHelper(code, lane_size, lane_count); + } + + fprintf(stream_, "\n"); +} + + +void Simulator::PrintSystemRegister(SystemRegister id) { + switch (id) { + case NZCV: + fprintf(stream_, "# %sNZCV: %sN:%d Z:%d C:%d V:%d%s\n", + clr_flag_name, clr_flag_value, + nzcv().N(), nzcv().Z(), nzcv().C(), nzcv().V(), + clr_normal); + break; + case FPCR: { + static const char * rmode[] = { + "0b00 (Round to Nearest)", + "0b01 (Round towards Plus Infinity)", + "0b10 (Round towards Minus Infinity)", + "0b11 (Round towards Zero)" + }; + VIXL_ASSERT(fpcr().RMode() < (sizeof(rmode) / sizeof(rmode[0]))); + fprintf(stream_, + "# %sFPCR: %sAHP:%d DN:%d FZ:%d RMode:%s%s\n", + clr_flag_name, clr_flag_value, + fpcr().AHP(), fpcr().DN(), fpcr().FZ(), rmode[fpcr().RMode()], + clr_normal); + break; + } + default: + VIXL_UNREACHABLE(); + } +} + + +void Simulator::PrintRead(uintptr_t address, + unsigned reg_code, + PrintRegisterFormat format) { + registers_[reg_code].NotifyRegisterLogged(); + + USE(format); + + // The template is "# {reg}: 0x{value} <- {address}". + PrintRegisterRawHelper(reg_code, Reg31IsZeroRegister); + fprintf(stream_, " <- %s0x%016" PRIxPTR "%s\n", + clr_memory_address, address, clr_normal); +} + + +void Simulator::PrintVRead(uintptr_t address, + unsigned reg_code, + PrintRegisterFormat format, + unsigned lane) { + vregisters_[reg_code].NotifyRegisterLogged(); + + // The template is "# v{code}: 0x{rawbits} <- address". + PrintVRegisterRawHelper(reg_code); + if (format & kPrintRegAsFP) { + PrintVRegisterFPHelper(reg_code, GetPrintRegLaneSizeInBytes(format), + GetPrintRegLaneCount(format), lane); + } + fprintf(stream_, " <- %s0x%016" PRIxPTR "%s\n", + clr_memory_address, address, clr_normal); +} + + +void Simulator::PrintWrite(uintptr_t address, + unsigned reg_code, + PrintRegisterFormat format) { + VIXL_ASSERT(GetPrintRegLaneCount(format) == 1); + + // The template is "# v{code}: 0x{value} -> {address}". To keep the trace tidy + // and readable, the value is aligned with the values in the register trace. + PrintRegisterRawHelper(reg_code, Reg31IsZeroRegister, + GetPrintRegSizeInBytes(format)); + fprintf(stream_, " -> %s0x%016" PRIxPTR "%s\n", + clr_memory_address, address, clr_normal); +} + + +void Simulator::PrintVWrite(uintptr_t address, + unsigned reg_code, + PrintRegisterFormat format, + unsigned lane) { + // The templates: + // "# v{code}: 0x{rawbits} -> {address}" + // "# v{code}: 0x{rawbits} (..., {value}, ...) -> {address}". + // "# v{code}: 0x{rawbits} ({reg}:{value}) -> {address}" + // Because this trace doesn't represent a change to the source register's + // value, only the relevant part of the value is printed. To keep the trace + // tidy and readable, the raw value is aligned with the other values in the + // register trace. + int lane_count = GetPrintRegLaneCount(format); + int lane_size = GetPrintRegLaneSizeInBytes(format); + int reg_size = GetPrintRegSizeInBytes(format); + PrintVRegisterRawHelper(reg_code, reg_size, lane_size * lane); + if (format & kPrintRegAsFP) { + PrintVRegisterFPHelper(reg_code, lane_size, lane_count, lane); + } + fprintf(stream_, " -> %s0x%016" PRIxPTR "%s\n", + clr_memory_address, address, clr_normal); +} + + +// Visitors--------------------------------------------------------------------- + +void Simulator::VisitUnimplemented(const Instruction* instr) { + printf("Unimplemented instruction at %p: 0x%08" PRIx32 "\n", + reinterpret_cast<const void*>(instr), instr->InstructionBits()); + VIXL_UNIMPLEMENTED(); +} + + +void Simulator::VisitUnallocated(const Instruction* instr) { + printf("Unallocated instruction at %p: 0x%08" PRIx32 "\n", + reinterpret_cast<const void*>(instr), instr->InstructionBits()); + VIXL_UNIMPLEMENTED(); +} + + +void Simulator::VisitPCRelAddressing(const Instruction* instr) { + VIXL_ASSERT((instr->Mask(PCRelAddressingMask) == ADR) || + (instr->Mask(PCRelAddressingMask) == ADRP)); + + set_reg(instr->Rd(), instr->ImmPCOffsetTarget()); +} + + +void Simulator::VisitUnconditionalBranch(const Instruction* instr) { + switch (instr->Mask(UnconditionalBranchMask)) { + case BL: + set_lr(instr->NextInstruction()); + VIXL_FALLTHROUGH(); + case B: + set_pc(instr->ImmPCOffsetTarget()); + break; + default: VIXL_UNREACHABLE(); + } +} + + +void Simulator::VisitConditionalBranch(const Instruction* instr) { + VIXL_ASSERT(instr->Mask(ConditionalBranchMask) == B_cond); + if (ConditionPassed(instr->ConditionBranch())) { + set_pc(instr->ImmPCOffsetTarget()); + } +} + + +void Simulator::VisitUnconditionalBranchToRegister(const Instruction* instr) { + const Instruction* target = Instruction::Cast(xreg(instr->Rn())); + + switch (instr->Mask(UnconditionalBranchToRegisterMask)) { + case BLR: + set_lr(instr->NextInstruction()); + VIXL_FALLTHROUGH(); + case BR: + case RET: set_pc(target); break; + default: VIXL_UNREACHABLE(); + } +} + + +void Simulator::VisitTestBranch(const Instruction* instr) { + unsigned bit_pos = (instr->ImmTestBranchBit5() << 5) | + instr->ImmTestBranchBit40(); + bool bit_zero = ((xreg(instr->Rt()) >> bit_pos) & 1) == 0; + bool take_branch = false; + switch (instr->Mask(TestBranchMask)) { + case TBZ: take_branch = bit_zero; break; + case TBNZ: take_branch = !bit_zero; break; + default: VIXL_UNIMPLEMENTED(); + } + if (take_branch) { + set_pc(instr->ImmPCOffsetTarget()); + } +} + + +void Simulator::VisitCompareBranch(const Instruction* instr) { + unsigned rt = instr->Rt(); + bool take_branch = false; + switch (instr->Mask(CompareBranchMask)) { + case CBZ_w: take_branch = (wreg(rt) == 0); break; + case CBZ_x: take_branch = (xreg(rt) == 0); break; + case CBNZ_w: take_branch = (wreg(rt) != 0); break; + case CBNZ_x: take_branch = (xreg(rt) != 0); break; + default: VIXL_UNIMPLEMENTED(); + } + if (take_branch) { + set_pc(instr->ImmPCOffsetTarget()); + } +} + + +void Simulator::AddSubHelper(const Instruction* instr, int64_t op2) { + unsigned reg_size = instr->SixtyFourBits() ? kXRegSize : kWRegSize; + bool set_flags = instr->FlagsUpdate(); + int64_t new_val = 0; + Instr operation = instr->Mask(AddSubOpMask); + + switch (operation) { + case ADD: + case ADDS: { + new_val = AddWithCarry(reg_size, + set_flags, + reg(reg_size, instr->Rn(), instr->RnMode()), + op2); + break; + } + case SUB: + case SUBS: { + new_val = AddWithCarry(reg_size, + set_flags, + reg(reg_size, instr->Rn(), instr->RnMode()), + ~op2, + 1); + break; + } + default: VIXL_UNREACHABLE(); + } + + set_reg(reg_size, instr->Rd(), new_val, LogRegWrites, instr->RdMode()); +} + + +void Simulator::VisitAddSubShifted(const Instruction* instr) { + unsigned reg_size = instr->SixtyFourBits() ? kXRegSize : kWRegSize; + int64_t op2 = ShiftOperand(reg_size, + reg(reg_size, instr->Rm()), + static_cast<Shift>(instr->ShiftDP()), + instr->ImmDPShift()); + AddSubHelper(instr, op2); +} + + +void Simulator::VisitAddSubImmediate(const Instruction* instr) { + int64_t op2 = instr->ImmAddSub() << ((instr->ShiftAddSub() == 1) ? 12 : 0); + AddSubHelper(instr, op2); +} + + +void Simulator::VisitAddSubExtended(const Instruction* instr) { + unsigned reg_size = instr->SixtyFourBits() ? kXRegSize : kWRegSize; + int64_t op2 = ExtendValue(reg_size, + reg(reg_size, instr->Rm()), + static_cast<Extend>(instr->ExtendMode()), + instr->ImmExtendShift()); + AddSubHelper(instr, op2); +} + + +void Simulator::VisitAddSubWithCarry(const Instruction* instr) { + unsigned reg_size = instr->SixtyFourBits() ? kXRegSize : kWRegSize; + int64_t op2 = reg(reg_size, instr->Rm()); + int64_t new_val; + + if ((instr->Mask(AddSubOpMask) == SUB) || instr->Mask(AddSubOpMask) == SUBS) { + op2 = ~op2; + } + + new_val = AddWithCarry(reg_size, + instr->FlagsUpdate(), + reg(reg_size, instr->Rn()), + op2, + C()); + + set_reg(reg_size, instr->Rd(), new_val); +} + + +void Simulator::VisitLogicalShifted(const Instruction* instr) { + unsigned reg_size = instr->SixtyFourBits() ? kXRegSize : kWRegSize; + Shift shift_type = static_cast<Shift>(instr->ShiftDP()); + unsigned shift_amount = instr->ImmDPShift(); + int64_t op2 = ShiftOperand(reg_size, reg(reg_size, instr->Rm()), shift_type, + shift_amount); + if (instr->Mask(NOT) == NOT) { + op2 = ~op2; + } + LogicalHelper(instr, op2); +} + + +void Simulator::VisitLogicalImmediate(const Instruction* instr) { + LogicalHelper(instr, instr->ImmLogical()); +} + + +void Simulator::LogicalHelper(const Instruction* instr, int64_t op2) { + unsigned reg_size = instr->SixtyFourBits() ? kXRegSize : kWRegSize; + int64_t op1 = reg(reg_size, instr->Rn()); + int64_t result = 0; + bool update_flags = false; + + // Switch on the logical operation, stripping out the NOT bit, as it has a + // different meaning for logical immediate instructions. + switch (instr->Mask(LogicalOpMask & ~NOT)) { + case ANDS: update_flags = true; VIXL_FALLTHROUGH(); + case AND: result = op1 & op2; break; + case ORR: result = op1 | op2; break; + case EOR: result = op1 ^ op2; break; + default: + VIXL_UNIMPLEMENTED(); + } + + if (update_flags) { + nzcv().SetN(CalcNFlag(result, reg_size)); + nzcv().SetZ(CalcZFlag(result)); + nzcv().SetC(0); + nzcv().SetV(0); + LogSystemRegister(NZCV); + } + + set_reg(reg_size, instr->Rd(), result, LogRegWrites, instr->RdMode()); +} + + +void Simulator::VisitConditionalCompareRegister(const Instruction* instr) { + unsigned reg_size = instr->SixtyFourBits() ? kXRegSize : kWRegSize; + ConditionalCompareHelper(instr, reg(reg_size, instr->Rm())); +} + + +void Simulator::VisitConditionalCompareImmediate(const Instruction* instr) { + ConditionalCompareHelper(instr, instr->ImmCondCmp()); +} + + +void Simulator::ConditionalCompareHelper(const Instruction* instr, + int64_t op2) { + unsigned reg_size = instr->SixtyFourBits() ? kXRegSize : kWRegSize; + int64_t op1 = reg(reg_size, instr->Rn()); + + if (ConditionPassed(instr->Condition())) { + // If the condition passes, set the status flags to the result of comparing + // the operands. + if (instr->Mask(ConditionalCompareMask) == CCMP) { + AddWithCarry(reg_size, true, op1, ~op2, 1); + } else { + VIXL_ASSERT(instr->Mask(ConditionalCompareMask) == CCMN); + AddWithCarry(reg_size, true, op1, op2, 0); + } + } else { + // If the condition fails, set the status flags to the nzcv immediate. + nzcv().SetFlags(instr->Nzcv()); + LogSystemRegister(NZCV); + } +} + + +void Simulator::VisitLoadStoreUnsignedOffset(const Instruction* instr) { + int offset = instr->ImmLSUnsigned() << instr->SizeLS(); + LoadStoreHelper(instr, offset, Offset); +} + + +void Simulator::VisitLoadStoreUnscaledOffset(const Instruction* instr) { + LoadStoreHelper(instr, instr->ImmLS(), Offset); +} + + +void Simulator::VisitLoadStorePreIndex(const Instruction* instr) { + LoadStoreHelper(instr, instr->ImmLS(), PreIndex); +} + + +void Simulator::VisitLoadStorePostIndex(const Instruction* instr) { + LoadStoreHelper(instr, instr->ImmLS(), PostIndex); +} + + +void Simulator::VisitLoadStoreRegisterOffset(const Instruction* instr) { + Extend ext = static_cast<Extend>(instr->ExtendMode()); + VIXL_ASSERT((ext == UXTW) || (ext == UXTX) || (ext == SXTW) || (ext == SXTX)); + unsigned shift_amount = instr->ImmShiftLS() * instr->SizeLS(); + + int64_t offset = ExtendValue(kXRegSize, xreg(instr->Rm()), ext, + shift_amount); + LoadStoreHelper(instr, offset, Offset); +} + +template<typename T> +static T Faulted() { + return ~0; +} + +template<> +Simulator::qreg_t Faulted() { + static_assert(kQRegSizeInBytes == 16, "Known constraint"); + static Simulator::qreg_t dummy = { { + 255, 255, 255, 255, 255, 255, 255, 255, + 255, 255, 255, 255, 255, 255, 255, 255 + } }; + return dummy; +} + +template<typename T> T +Simulator::Read(uintptr_t address) +{ + address = Memory::AddressUntag(address); + if (handle_wasm_seg_fault(address, sizeof(T))) + return Faulted<T>(); + return Memory::Read<T>(address); +} + +template <typename T> void +Simulator::Write(uintptr_t address, T value) +{ + address = Memory::AddressUntag(address); + if (handle_wasm_seg_fault(address, sizeof(T))) + return; + Memory::Write<T>(address, value); +} + +void Simulator::LoadStoreHelper(const Instruction* instr, + int64_t offset, + AddrMode addrmode) { + unsigned srcdst = instr->Rt(); + uintptr_t address = AddressModeHelper(instr->Rn(), offset, addrmode); + + LoadStoreOp op = static_cast<LoadStoreOp>(instr->Mask(LoadStoreMask)); + switch (op) { + case LDRB_w: + set_wreg(srcdst, Read<uint8_t>(address), NoRegLog); break; + case LDRH_w: + set_wreg(srcdst, Read<uint16_t>(address), NoRegLog); break; + case LDR_w: + set_wreg(srcdst, Read<uint32_t>(address), NoRegLog); break; + case LDR_x: + set_xreg(srcdst, Read<uint64_t>(address), NoRegLog); break; + case LDRSB_w: + set_wreg(srcdst, Read<int8_t>(address), NoRegLog); break; + case LDRSH_w: + set_wreg(srcdst, Read<int16_t>(address), NoRegLog); break; + case LDRSB_x: + set_xreg(srcdst, Read<int8_t>(address), NoRegLog); break; + case LDRSH_x: + set_xreg(srcdst, Read<int16_t>(address), NoRegLog); break; + case LDRSW_x: + set_xreg(srcdst, Read<int32_t>(address), NoRegLog); break; + case LDR_b: + set_breg(srcdst, Read<uint8_t>(address), NoRegLog); break; + case LDR_h: + set_hreg(srcdst, Read<uint16_t>(address), NoRegLog); break; + case LDR_s: + set_sreg(srcdst, Read<float>(address), NoRegLog); break; + case LDR_d: + set_dreg(srcdst, Read<double>(address), NoRegLog); break; + case LDR_q: + set_qreg(srcdst, Read<qreg_t>(address), NoRegLog); break; + + case STRB_w: Write<uint8_t>(address, wreg(srcdst)); break; + case STRH_w: Write<uint16_t>(address, wreg(srcdst)); break; + case STR_w: Write<uint32_t>(address, wreg(srcdst)); break; + case STR_x: Write<uint64_t>(address, xreg(srcdst)); break; + case STR_b: Write<uint8_t>(address, breg(srcdst)); break; + case STR_h: Write<uint16_t>(address, hreg(srcdst)); break; + case STR_s: Write<float>(address, sreg(srcdst)); break; + case STR_d: Write<double>(address, dreg(srcdst)); break; + case STR_q: Write<qreg_t>(address, qreg(srcdst)); break; + + // Ignore prfm hint instructions. + case PRFM: break; + + default: VIXL_UNIMPLEMENTED(); + } + + unsigned access_size = 1 << instr->SizeLS(); + if (instr->IsLoad()) { + if ((op == LDR_s) || (op == LDR_d)) { + LogVRead(address, srcdst, GetPrintRegisterFormatForSizeFP(access_size)); + } else if ((op == LDR_b) || (op == LDR_h) || (op == LDR_q)) { + LogVRead(address, srcdst, GetPrintRegisterFormatForSize(access_size)); + } else { + LogRead(address, srcdst, GetPrintRegisterFormatForSize(access_size)); + } + } else { + if ((op == STR_s) || (op == STR_d)) { + LogVWrite(address, srcdst, GetPrintRegisterFormatForSizeFP(access_size)); + } else if ((op == STR_b) || (op == STR_h) || (op == STR_q)) { + LogVWrite(address, srcdst, GetPrintRegisterFormatForSize(access_size)); + } else { + LogWrite(address, srcdst, GetPrintRegisterFormatForSize(access_size)); + } + } + + local_monitor_.MaybeClear(); +} + + +void Simulator::VisitLoadStorePairOffset(const Instruction* instr) { + LoadStorePairHelper(instr, Offset); +} + + +void Simulator::VisitLoadStorePairPreIndex(const Instruction* instr) { + LoadStorePairHelper(instr, PreIndex); +} + + +void Simulator::VisitLoadStorePairPostIndex(const Instruction* instr) { + LoadStorePairHelper(instr, PostIndex); +} + + +void Simulator::VisitLoadStorePairNonTemporal(const Instruction* instr) { + LoadStorePairHelper(instr, Offset); +} + + +void Simulator::LoadStorePairHelper(const Instruction* instr, + AddrMode addrmode) { + unsigned rt = instr->Rt(); + unsigned rt2 = instr->Rt2(); + int element_size = 1 << instr->SizeLSPair(); + int64_t offset = instr->ImmLSPair() * element_size; + uintptr_t address = AddressModeHelper(instr->Rn(), offset, addrmode); + uintptr_t address2 = address + element_size; + + LoadStorePairOp op = + static_cast<LoadStorePairOp>(instr->Mask(LoadStorePairMask)); + + // 'rt' and 'rt2' can only be aliased for stores. + VIXL_ASSERT(((op & LoadStorePairLBit) == 0) || (rt != rt2)); + + switch (op) { + // Use NoRegLog to suppress the register trace (LOG_REGS, LOG_FP_REGS). We + // will print a more detailed log. + case LDP_w: { + set_wreg(rt, Read<uint32_t>(address), NoRegLog); + set_wreg(rt2, Read<uint32_t>(address2), NoRegLog); + break; + } + case LDP_s: { + set_sreg(rt, Read<float>(address), NoRegLog); + set_sreg(rt2, Read<float>(address2), NoRegLog); + break; + } + case LDP_x: { + set_xreg(rt, Read<uint64_t>(address), NoRegLog); + set_xreg(rt2, Read<uint64_t>(address2), NoRegLog); + break; + } + case LDP_d: { + set_dreg(rt, Read<double>(address), NoRegLog); + set_dreg(rt2, Read<double>(address2), NoRegLog); + break; + } + case LDP_q: { + set_qreg(rt, Read<qreg_t>(address), NoRegLog); + set_qreg(rt2, Read<qreg_t>(address2), NoRegLog); + break; + } + case LDPSW_x: { + set_xreg(rt, Read<int32_t>(address), NoRegLog); + set_xreg(rt2, Read<int32_t>(address2), NoRegLog); + break; + } + case STP_w: { + Write<uint32_t>(address, wreg(rt)); + Write<uint32_t>(address2, wreg(rt2)); + break; + } + case STP_s: { + Write<float>(address, sreg(rt)); + Write<float>(address2, sreg(rt2)); + break; + } + case STP_x: { + Write<uint64_t>(address, xreg(rt)); + Write<uint64_t>(address2, xreg(rt2)); + break; + } + case STP_d: { + Write<double>(address, dreg(rt)); + Write<double>(address2, dreg(rt2)); + break; + } + case STP_q: { + Write<qreg_t>(address, qreg(rt)); + Write<qreg_t>(address2, qreg(rt2)); + break; + } + default: VIXL_UNREACHABLE(); + } + + // Print a detailed trace (including the memory address) instead of the basic + // register:value trace generated by set_*reg(). + if (instr->IsLoad()) { + if ((op == LDP_s) || (op == LDP_d)) { + LogVRead(address, rt, GetPrintRegisterFormatForSizeFP(element_size)); + LogVRead(address2, rt2, GetPrintRegisterFormatForSizeFP(element_size)); + } else if (op == LDP_q) { + LogVRead(address, rt, GetPrintRegisterFormatForSize(element_size)); + LogVRead(address2, rt2, GetPrintRegisterFormatForSize(element_size)); + } else { + LogRead(address, rt, GetPrintRegisterFormatForSize(element_size)); + LogRead(address2, rt2, GetPrintRegisterFormatForSize(element_size)); + } + } else { + if ((op == STP_s) || (op == STP_d)) { + LogVWrite(address, rt, GetPrintRegisterFormatForSizeFP(element_size)); + LogVWrite(address2, rt2, GetPrintRegisterFormatForSizeFP(element_size)); + } else if (op == STP_q) { + LogVWrite(address, rt, GetPrintRegisterFormatForSize(element_size)); + LogVWrite(address2, rt2, GetPrintRegisterFormatForSize(element_size)); + } else { + LogWrite(address, rt, GetPrintRegisterFormatForSize(element_size)); + LogWrite(address2, rt2, GetPrintRegisterFormatForSize(element_size)); + } + } + + local_monitor_.MaybeClear(); +} + + +void Simulator::PrintExclusiveAccessWarning() { + if (print_exclusive_access_warning_) { + fprintf( + stderr, + "%sWARNING:%s VIXL simulator support for load-/store-/clear-exclusive " + "instructions is limited. Refer to the README for details.%s\n", + clr_warning, clr_warning_message, clr_normal); + print_exclusive_access_warning_ = false; + } +} + +template <typename T> +void Simulator::CompareAndSwapHelper(const Instruction* instr) { + unsigned rs = instr->Rs(); + unsigned rt = instr->Rt(); + unsigned rn = instr->Rn(); + + unsigned element_size = sizeof(T); + uint64_t address = reg<uint64_t>(rn, Reg31IsStackPointer); + + // Verify that the address is available to the host. + VIXL_ASSERT(address == static_cast<uintptr_t>(address)); + + address = Memory::AddressUntag(address); + if (handle_wasm_seg_fault(address, element_size)) + return; + + bool is_acquire = instr->Bit(22) == 1; + bool is_release = instr->Bit(15) == 1; + + T comparevalue = reg<T>(rs); + T newvalue = reg<T>(rt); + + // The architecture permits that the data read clears any exclusive monitors + // associated with that location, even if the compare subsequently fails. + local_monitor_.Clear(); + + T data = Memory::Read<T>(address); + if (is_acquire) { + // Approximate load-acquire by issuing a full barrier after the load. + __sync_synchronize(); + } + + if (data == comparevalue) { + if (is_release) { + // Approximate store-release by issuing a full barrier before the store. + __sync_synchronize(); + } + Memory::Write<T>(address, newvalue); + LogWrite(address, rt, GetPrintRegisterFormatForSize(element_size)); + } + set_reg<T>(rs, data); + LogRead(address, rs, GetPrintRegisterFormatForSize(element_size)); +} + +template <typename T> +void Simulator::CompareAndSwapPairHelper(const Instruction* instr) { + VIXL_ASSERT((sizeof(T) == 4) || (sizeof(T) == 8)); + unsigned rs = instr->Rs(); + unsigned rt = instr->Rt(); + unsigned rn = instr->Rn(); + + VIXL_ASSERT((rs % 2 == 0) && (rs % 2 == 0)); + + unsigned element_size = sizeof(T); + uint64_t address = reg<uint64_t>(rn, Reg31IsStackPointer); + + // Verify that the address is available to the host. + VIXL_ASSERT(address == static_cast<uintptr_t>(address)); + + address = Memory::AddressUntag(address); + if (handle_wasm_seg_fault(address, element_size)) + return; + + uint64_t address2 = address + element_size; + + bool is_acquire = instr->Bit(22) == 1; + bool is_release = instr->Bit(15) == 1; + + T comparevalue_high = reg<T>(rs + 1); + T comparevalue_low = reg<T>(rs); + T newvalue_high = reg<T>(rt + 1); + T newvalue_low = reg<T>(rt); + + // The architecture permits that the data read clears any exclusive monitors + // associated with that location, even if the compare subsequently fails. + local_monitor_.Clear(); + + T data_high = Memory::Read<T>(address); + T data_low = Memory::Read<T>(address2); + + if (is_acquire) { + // Approximate load-acquire by issuing a full barrier after the load. + __sync_synchronize(); + } + + bool same = + (data_high == comparevalue_high) && (data_low == comparevalue_low); + if (same) { + if (is_release) { + // Approximate store-release by issuing a full barrier before the store. + __sync_synchronize(); + } + + Memory::Write<T>(address, newvalue_high); + Memory::Write<T>(address2, newvalue_low); + } + + set_reg<T>(rs + 1, data_high); + set_reg<T>(rs, data_low); + + LogRead(address, rs + 1, GetPrintRegisterFormatForSize(element_size)); + LogRead(address2, rs, GetPrintRegisterFormatForSize(element_size)); + + if (same) { + LogWrite(address, rt + 1, GetPrintRegisterFormatForSize(element_size)); + LogWrite(address2, rt, GetPrintRegisterFormatForSize(element_size)); + } +} + +void Simulator::VisitLoadStoreExclusive(const Instruction* instr) { + LoadStoreExclusive op = + static_cast<LoadStoreExclusive>(instr->Mask(LoadStoreExclusiveMask)); + + switch (op) { + case CAS_w: + case CASA_w: + case CASL_w: + case CASAL_w: + CompareAndSwapHelper<uint32_t>(instr); + break; + case CAS_x: + case CASA_x: + case CASL_x: + case CASAL_x: + CompareAndSwapHelper<uint64_t>(instr); + break; + case CASB: + case CASAB: + case CASLB: + case CASALB: + CompareAndSwapHelper<uint8_t>(instr); + break; + case CASH: + case CASAH: + case CASLH: + case CASALH: + CompareAndSwapHelper<uint16_t>(instr); + break; + case CASP_w: + case CASPA_w: + case CASPL_w: + case CASPAL_w: + CompareAndSwapPairHelper<uint32_t>(instr); + break; + case CASP_x: + case CASPA_x: + case CASPL_x: + case CASPAL_x: + CompareAndSwapPairHelper<uint64_t>(instr); + break; + default: + PrintExclusiveAccessWarning(); + + unsigned rs = instr->Rs(); + unsigned rt = instr->Rt(); + unsigned rt2 = instr->Rt2(); + unsigned rn = instr->Rn(); + + bool is_exclusive = !instr->LdStXNotExclusive(); + bool is_acquire_release = !is_exclusive || instr->LdStXAcquireRelease(); + bool is_load = instr->LdStXLoad(); + bool is_pair = instr->LdStXPair(); + + unsigned element_size = 1 << instr->LdStXSizeLog2(); + unsigned access_size = is_pair ? element_size * 2 : element_size; + uint64_t address = reg<uint64_t>(rn, Reg31IsStackPointer); + + // Verify that the address is available to the host. + VIXL_ASSERT(address == static_cast<uintptr_t>(address)); + + // Check the alignment of `address`. + if (AlignDown(address, access_size) != address) { + VIXL_ALIGNMENT_EXCEPTION(); + } + + // The sp must be aligned to 16 bytes when it is accessed. + if ((rn == 31) && (AlignDown(address, 16) != address)) { + VIXL_ALIGNMENT_EXCEPTION(); + } + + if (is_load) { + if (is_exclusive) { + local_monitor_.MarkExclusive(address, access_size); + } else { + // Any non-exclusive load can clear the local monitor as a side + // effect. We don't need to do this, but it is useful to stress the + // simulated code. + local_monitor_.Clear(); + } + + // Use NoRegLog to suppress the register trace (LOG_REGS, LOG_FP_REGS). + // We will print a more detailed log. + switch (op) { + case LDXRB_w: + case LDAXRB_w: + case LDARB_w: + set_wreg(rt, Read<uint8_t>(address), NoRegLog); + break; + case LDXRH_w: + case LDAXRH_w: + case LDARH_w: + set_wreg(rt, Read<uint16_t>(address), NoRegLog); + break; + case LDXR_w: + case LDAXR_w: + case LDAR_w: + set_wreg(rt, Read<uint32_t>(address), NoRegLog); + break; + case LDXR_x: + case LDAXR_x: + case LDAR_x: + set_xreg(rt, Read<uint64_t>(address), NoRegLog); + break; + case LDXP_w: + case LDAXP_w: + set_wreg(rt, Read<uint32_t>(address), NoRegLog); + set_wreg(rt2, Read<uint32_t>(address + element_size), NoRegLog); + break; + case LDXP_x: + case LDAXP_x: + set_xreg(rt, Read<uint64_t>(address), NoRegLog); + set_xreg(rt2, Read<uint64_t>(address + element_size), NoRegLog); + break; + default: + VIXL_UNREACHABLE(); + } + + if (is_acquire_release) { + // Approximate load-acquire by issuing a full barrier after the load. + js::jit::AtomicOperations::fenceSeqCst(); + } + + LogRead(address, rt, GetPrintRegisterFormatForSize(element_size)); + if (is_pair) { + LogRead(address + element_size, rt2, + GetPrintRegisterFormatForSize(element_size)); + } + } else { + if (is_acquire_release) { + // Approximate store-release by issuing a full barrier before the + // store. + js::jit::AtomicOperations::fenceSeqCst(); + } + + bool do_store = true; + if (is_exclusive) { + do_store = local_monitor_.IsExclusive(address, access_size) && + global_monitor_.IsExclusive(address, access_size); + set_wreg(rs, do_store ? 0 : 1); + + // - All exclusive stores explicitly clear the local monitor. + local_monitor_.Clear(); + } else { + // - Any other store can clear the local monitor as a side effect. + local_monitor_.MaybeClear(); + } + + if (do_store) { + switch (op) { + case STXRB_w: + case STLXRB_w: + case STLRB_w: + Write<uint8_t>(address, wreg(rt)); + break; + case STXRH_w: + case STLXRH_w: + case STLRH_w: + Write<uint16_t>(address, wreg(rt)); + break; + case STXR_w: + case STLXR_w: + case STLR_w: + Write<uint32_t>(address, wreg(rt)); + break; + case STXR_x: + case STLXR_x: + case STLR_x: + Write<uint64_t>(address, xreg(rt)); + break; + case STXP_w: + case STLXP_w: + Write<uint32_t>(address, wreg(rt)); + Write<uint32_t>(address + element_size, wreg(rt2)); + break; + case STXP_x: + case STLXP_x: + Write<uint64_t>(address, xreg(rt)); + Write<uint64_t>(address + element_size, xreg(rt2)); + break; + default: + VIXL_UNREACHABLE(); + } + + LogWrite(address, rt, GetPrintRegisterFormatForSize(element_size)); + if (is_pair) { + LogWrite(address + element_size, rt2, + GetPrintRegisterFormatForSize(element_size)); + } + } + } + } +} + +template <typename T> +void Simulator::AtomicMemorySimpleHelper(const Instruction* instr) { + unsigned rs = instr->Rs(); + unsigned rt = instr->Rt(); + unsigned rn = instr->Rn(); + + bool is_acquire = (instr->Bit(23) == 1) && (rt != kZeroRegCode); + bool is_release = instr->Bit(22) == 1; + + unsigned element_size = sizeof(T); + uint64_t address = reg<uint64_t>(rn, Reg31IsStackPointer); + + // Verify that the address is available to the host. + VIXL_ASSERT(address == static_cast<uintptr_t>(address)); + + address = Memory::AddressUntag(address); + if (handle_wasm_seg_fault(address, sizeof(T))) + return; + + T value = reg<T>(rs); + + T data = Memory::Read<T>(address); + + if (is_acquire) { + // Approximate load-acquire by issuing a full barrier after the load. + __sync_synchronize(); + } + + T result = 0; + switch (instr->Mask(AtomicMemorySimpleOpMask)) { + case LDADDOp: + result = data + value; + break; + case LDCLROp: + VIXL_ASSERT(!std::numeric_limits<T>::is_signed); + result = data & ~value; + break; + case LDEOROp: + VIXL_ASSERT(!std::numeric_limits<T>::is_signed); + result = data ^ value; + break; + case LDSETOp: + VIXL_ASSERT(!std::numeric_limits<T>::is_signed); + result = data | value; + break; + + // Signed/Unsigned difference is done via the templated type T. + case LDSMAXOp: + case LDUMAXOp: + result = (data > value) ? data : value; + break; + case LDSMINOp: + case LDUMINOp: + result = (data > value) ? value : data; + break; + } + + if (is_release) { + // Approximate store-release by issuing a full barrier before the store. + __sync_synchronize(); + } + + Memory::Write<T>(address, result); + set_reg<T>(rt, data, NoRegLog); + + LogRead(address, rt, GetPrintRegisterFormatForSize(element_size)); + LogWrite(address, rs, GetPrintRegisterFormatForSize(element_size)); +} + +template <typename T> +void Simulator::AtomicMemorySwapHelper(const Instruction* instr) { + unsigned rs = instr->Rs(); + unsigned rt = instr->Rt(); + unsigned rn = instr->Rn(); + + bool is_acquire = (instr->Bit(23) == 1) && (rt != kZeroRegCode); + bool is_release = instr->Bit(22) == 1; + + unsigned element_size = sizeof(T); + uint64_t address = reg<uint64_t>(rn, Reg31IsStackPointer); + + // Verify that the address is available to the host. + VIXL_ASSERT(address == static_cast<uintptr_t>(address)); + + address = Memory::AddressUntag(address); + if (handle_wasm_seg_fault(address, sizeof(T))) + return; + + T data = Memory::Read<T>(address); + if (is_acquire) { + // Approximate load-acquire by issuing a full barrier after the load. + __sync_synchronize(); + } + + if (is_release) { + // Approximate store-release by issuing a full barrier before the store. + __sync_synchronize(); + } + Memory::Write<T>(address, reg<T>(rs)); + + set_reg<T>(rt, data); + + LogRead(address, rt, GetPrintRegisterFormat(element_size)); + LogWrite(address, rs, GetPrintRegisterFormat(element_size)); +} + +template <typename T> +void Simulator::LoadAcquireRCpcHelper(const Instruction* instr) { + unsigned rt = instr->Rt(); + unsigned rn = instr->Rn(); + + unsigned element_size = sizeof(T); + uint64_t address = reg<uint64_t>(rn, Reg31IsStackPointer); + + // Verify that the address is available to the host. + VIXL_ASSERT(address == static_cast<uintptr_t>(address)); + + address = Memory::AddressUntag(address); + if (handle_wasm_seg_fault(address, sizeof(T))) + return; + + set_reg<T>(rt, Memory::Read<T>(address)); + + // Approximate load-acquire by issuing a full barrier after the load. + __sync_synchronize(); + + LogRead(address, rt, GetPrintRegisterFormat(element_size)); +} + +#define ATOMIC_MEMORY_SIMPLE_UINT_LIST(V) \ + V(LDADD) \ + V(LDCLR) \ + V(LDEOR) \ + V(LDSET) \ + V(LDUMAX) \ + V(LDUMIN) + +#define ATOMIC_MEMORY_SIMPLE_INT_LIST(V) \ + V(LDSMAX) \ + V(LDSMIN) + +void Simulator::VisitAtomicMemory(const Instruction* instr) { + switch (instr->Mask(AtomicMemoryMask)) { +// clang-format off +#define SIM_FUNC_B(A) \ + case A##B: \ + case A##AB: \ + case A##LB: \ + case A##ALB: +#define SIM_FUNC_H(A) \ + case A##H: \ + case A##AH: \ + case A##LH: \ + case A##ALH: +#define SIM_FUNC_w(A) \ + case A##_w: \ + case A##A_w: \ + case A##L_w: \ + case A##AL_w: +#define SIM_FUNC_x(A) \ + case A##_x: \ + case A##A_x: \ + case A##L_x: \ + case A##AL_x: + + ATOMIC_MEMORY_SIMPLE_UINT_LIST(SIM_FUNC_B) + AtomicMemorySimpleHelper<uint8_t>(instr); + break; + ATOMIC_MEMORY_SIMPLE_INT_LIST(SIM_FUNC_B) + AtomicMemorySimpleHelper<int8_t>(instr); + break; + ATOMIC_MEMORY_SIMPLE_UINT_LIST(SIM_FUNC_H) + AtomicMemorySimpleHelper<uint16_t>(instr); + break; + ATOMIC_MEMORY_SIMPLE_INT_LIST(SIM_FUNC_H) + AtomicMemorySimpleHelper<int16_t>(instr); + break; + ATOMIC_MEMORY_SIMPLE_UINT_LIST(SIM_FUNC_w) + AtomicMemorySimpleHelper<uint32_t>(instr); + break; + ATOMIC_MEMORY_SIMPLE_INT_LIST(SIM_FUNC_w) + AtomicMemorySimpleHelper<int32_t>(instr); + break; + ATOMIC_MEMORY_SIMPLE_UINT_LIST(SIM_FUNC_x) + AtomicMemorySimpleHelper<uint64_t>(instr); + break; + ATOMIC_MEMORY_SIMPLE_INT_LIST(SIM_FUNC_x) + AtomicMemorySimpleHelper<int64_t>(instr); + break; + // clang-format on + + case SWPB: + case SWPAB: + case SWPLB: + case SWPALB: + AtomicMemorySwapHelper<uint8_t>(instr); + break; + case SWPH: + case SWPAH: + case SWPLH: + case SWPALH: + AtomicMemorySwapHelper<uint16_t>(instr); + break; + case SWP_w: + case SWPA_w: + case SWPL_w: + case SWPAL_w: + AtomicMemorySwapHelper<uint32_t>(instr); + break; + case SWP_x: + case SWPA_x: + case SWPL_x: + case SWPAL_x: + AtomicMemorySwapHelper<uint64_t>(instr); + break; + case LDAPRB: + LoadAcquireRCpcHelper<uint8_t>(instr); + break; + case LDAPRH: + LoadAcquireRCpcHelper<uint16_t>(instr); + break; + case LDAPR_w: + LoadAcquireRCpcHelper<uint32_t>(instr); + break; + case LDAPR_x: + LoadAcquireRCpcHelper<uint64_t>(instr); + break; + } +} + +void Simulator::VisitLoadLiteral(const Instruction* instr) { + unsigned rt = instr->Rt(); + uint64_t address = instr->LiteralAddress<uint64_t>(); + + // Verify that the calculated address is available to the host. + VIXL_ASSERT(address == static_cast<uintptr_t>(address)); + + switch (instr->Mask(LoadLiteralMask)) { + // Use NoRegLog to suppress the register trace (LOG_REGS, LOG_VREGS), then + // print a more detailed log. + case LDR_w_lit: + set_wreg(rt, Read<uint32_t>(address), NoRegLog); + LogRead(address, rt, kPrintWReg); + break; + case LDR_x_lit: + set_xreg(rt, Read<uint64_t>(address), NoRegLog); + LogRead(address, rt, kPrintXReg); + break; + case LDR_s_lit: + set_sreg(rt, Read<float>(address), NoRegLog); + LogVRead(address, rt, kPrintSReg); + break; + case LDR_d_lit: + set_dreg(rt, Read<double>(address), NoRegLog); + LogVRead(address, rt, kPrintDReg); + break; + case LDR_q_lit: + set_qreg(rt, Read<qreg_t>(address), NoRegLog); + LogVRead(address, rt, kPrintReg1Q); + break; + case LDRSW_x_lit: + set_xreg(rt, Read<int32_t>(address), NoRegLog); + LogRead(address, rt, kPrintWReg); + break; + + // Ignore prfm hint instructions. + case PRFM_lit: break; + + default: VIXL_UNREACHABLE(); + } + + local_monitor_.MaybeClear(); +} + + +uintptr_t Simulator::AddressModeHelper(unsigned addr_reg, + int64_t offset, + AddrMode addrmode) { + uint64_t address = xreg(addr_reg, Reg31IsStackPointer); + + if ((addr_reg == 31) && ((address % 16) != 0)) { + // When the base register is SP the stack pointer is required to be + // quadword aligned prior to the address calculation and write-backs. + // Misalignment will cause a stack alignment fault. + VIXL_ALIGNMENT_EXCEPTION(); + } + + if ((addrmode == PreIndex) || (addrmode == PostIndex)) { + VIXL_ASSERT(offset != 0); + // Only preindex should log the register update here. For Postindex, the + // update will be printed automatically by LogWrittenRegisters _after_ the + // memory access itself is logged. + RegLogMode log_mode = (addrmode == PreIndex) ? LogRegWrites : NoRegLog; + set_xreg(addr_reg, address + offset, log_mode, Reg31IsStackPointer); + } + + if ((addrmode == Offset) || (addrmode == PreIndex)) { + address += offset; + } + + // Verify that the calculated address is available to the host. + VIXL_ASSERT(address == static_cast<uintptr_t>(address)); + + return static_cast<uintptr_t>(address); +} + + +void Simulator::VisitMoveWideImmediate(const Instruction* instr) { + MoveWideImmediateOp mov_op = + static_cast<MoveWideImmediateOp>(instr->Mask(MoveWideImmediateMask)); + int64_t new_xn_val = 0; + + bool is_64_bits = instr->SixtyFourBits() == 1; + // Shift is limited for W operations. + VIXL_ASSERT(is_64_bits || (instr->ShiftMoveWide() < 2)); + + // Get the shifted immediate. + int64_t shift = instr->ShiftMoveWide() * 16; + int64_t shifted_imm16 = static_cast<int64_t>(instr->ImmMoveWide()) << shift; + + // Compute the new value. + switch (mov_op) { + case MOVN_w: + case MOVN_x: { + new_xn_val = ~shifted_imm16; + if (!is_64_bits) new_xn_val &= kWRegMask; + break; + } + case MOVK_w: + case MOVK_x: { + unsigned reg_code = instr->Rd(); + int64_t prev_xn_val = is_64_bits ? xreg(reg_code) + : wreg(reg_code); + new_xn_val = + (prev_xn_val & ~(INT64_C(0xffff) << shift)) | shifted_imm16; + break; + } + case MOVZ_w: + case MOVZ_x: { + new_xn_val = shifted_imm16; + break; + } + default: + VIXL_UNREACHABLE(); + } + + // Update the destination register. + set_xreg(instr->Rd(), new_xn_val); +} + + +void Simulator::VisitConditionalSelect(const Instruction* instr) { + uint64_t new_val = xreg(instr->Rn()); + + if (ConditionFailed(static_cast<Condition>(instr->Condition()))) { + new_val = xreg(instr->Rm()); + switch (instr->Mask(ConditionalSelectMask)) { + case CSEL_w: + case CSEL_x: break; + case CSINC_w: + case CSINC_x: new_val++; break; + case CSINV_w: + case CSINV_x: new_val = ~new_val; break; + case CSNEG_w: + case CSNEG_x: new_val = -new_val; break; + default: VIXL_UNIMPLEMENTED(); + } + } + unsigned reg_size = instr->SixtyFourBits() ? kXRegSize : kWRegSize; + set_reg(reg_size, instr->Rd(), new_val); +} + + +void Simulator::VisitDataProcessing1Source(const Instruction* instr) { + unsigned dst = instr->Rd(); + unsigned src = instr->Rn(); + + switch (instr->Mask(DataProcessing1SourceMask)) { + case RBIT_w: set_wreg(dst, ReverseBits(wreg(src))); break; + case RBIT_x: set_xreg(dst, ReverseBits(xreg(src))); break; + case REV16_w: set_wreg(dst, ReverseBytes(wreg(src), 1)); break; + case REV16_x: set_xreg(dst, ReverseBytes(xreg(src), 1)); break; + case REV_w: set_wreg(dst, ReverseBytes(wreg(src), 2)); break; + case REV32_x: set_xreg(dst, ReverseBytes(xreg(src), 2)); break; + case REV_x: set_xreg(dst, ReverseBytes(xreg(src), 3)); break; + case CLZ_w: set_wreg(dst, CountLeadingZeros(wreg(src))); break; + case CLZ_x: set_xreg(dst, CountLeadingZeros(xreg(src))); break; + case CLS_w: { + set_wreg(dst, CountLeadingSignBits(wreg(src))); + break; + } + case CLS_x: { + set_xreg(dst, CountLeadingSignBits(xreg(src))); + break; + } + default: VIXL_UNIMPLEMENTED(); + } +} + + +uint32_t Simulator::Poly32Mod2(unsigned n, uint64_t data, uint32_t poly) { + VIXL_ASSERT((n > 32) && (n <= 64)); + for (unsigned i = (n - 1); i >= 32; i--) { + if (((data >> i) & 1) != 0) { + uint64_t polysh32 = (uint64_t)poly << (i - 32); + uint64_t mask = (UINT64_C(1) << i) - 1; + data = ((data & mask) ^ polysh32); + } + } + return data & 0xffffffff; +} + + +template <typename T> +uint32_t Simulator::Crc32Checksum(uint32_t acc, T val, uint32_t poly) { + unsigned size = sizeof(val) * 8; // Number of bits in type T. + VIXL_ASSERT((size == 8) || (size == 16) || (size == 32)); + uint64_t tempacc = static_cast<uint64_t>(ReverseBits(acc)) << size; + uint64_t tempval = static_cast<uint64_t>(ReverseBits(val)) << 32; + return ReverseBits(Poly32Mod2(32 + size, tempacc ^ tempval, poly)); +} + + +uint32_t Simulator::Crc32Checksum(uint32_t acc, uint64_t val, uint32_t poly) { + // Poly32Mod2 cannot handle inputs with more than 32 bits, so compute + // the CRC of each 32-bit word sequentially. + acc = Crc32Checksum(acc, (uint32_t)(val & 0xffffffff), poly); + return Crc32Checksum(acc, (uint32_t)(val >> 32), poly); +} + + +void Simulator::VisitDataProcessing2Source(const Instruction* instr) { + Shift shift_op = NO_SHIFT; + int64_t result = 0; + unsigned reg_size = instr->SixtyFourBits() ? kXRegSize : kWRegSize; + + switch (instr->Mask(DataProcessing2SourceMask)) { + case SDIV_w: { + int32_t rn = wreg(instr->Rn()); + int32_t rm = wreg(instr->Rm()); + if ((rn == kWMinInt) && (rm == -1)) { + result = kWMinInt; + } else if (rm == 0) { + // Division by zero can be trapped, but not on A-class processors. + result = 0; + } else { + result = rn / rm; + } + break; + } + case SDIV_x: { + int64_t rn = xreg(instr->Rn()); + int64_t rm = xreg(instr->Rm()); + if ((rn == kXMinInt) && (rm == -1)) { + result = kXMinInt; + } else if (rm == 0) { + // Division by zero can be trapped, but not on A-class processors. + result = 0; + } else { + result = rn / rm; + } + break; + } + case UDIV_w: { + uint32_t rn = static_cast<uint32_t>(wreg(instr->Rn())); + uint32_t rm = static_cast<uint32_t>(wreg(instr->Rm())); + if (rm == 0) { + // Division by zero can be trapped, but not on A-class processors. + result = 0; + } else { + result = rn / rm; + } + break; + } + case UDIV_x: { + uint64_t rn = static_cast<uint64_t>(xreg(instr->Rn())); + uint64_t rm = static_cast<uint64_t>(xreg(instr->Rm())); + if (rm == 0) { + // Division by zero can be trapped, but not on A-class processors. + result = 0; + } else { + result = rn / rm; + } + break; + } + case LSLV_w: + case LSLV_x: shift_op = LSL; break; + case LSRV_w: + case LSRV_x: shift_op = LSR; break; + case ASRV_w: + case ASRV_x: shift_op = ASR; break; + case RORV_w: + case RORV_x: shift_op = ROR; break; + case CRC32B: { + uint32_t acc = reg<uint32_t>(instr->Rn()); + uint8_t val = reg<uint8_t>(instr->Rm()); + result = Crc32Checksum(acc, val, CRC32_POLY); + break; + } + case CRC32H: { + uint32_t acc = reg<uint32_t>(instr->Rn()); + uint16_t val = reg<uint16_t>(instr->Rm()); + result = Crc32Checksum(acc, val, CRC32_POLY); + break; + } + case CRC32W: { + uint32_t acc = reg<uint32_t>(instr->Rn()); + uint32_t val = reg<uint32_t>(instr->Rm()); + result = Crc32Checksum(acc, val, CRC32_POLY); + break; + } + case CRC32X: { + uint32_t acc = reg<uint32_t>(instr->Rn()); + uint64_t val = reg<uint64_t>(instr->Rm()); + result = Crc32Checksum(acc, val, CRC32_POLY); + reg_size = kWRegSize; + break; + } + case CRC32CB: { + uint32_t acc = reg<uint32_t>(instr->Rn()); + uint8_t val = reg<uint8_t>(instr->Rm()); + result = Crc32Checksum(acc, val, CRC32C_POLY); + break; + } + case CRC32CH: { + uint32_t acc = reg<uint32_t>(instr->Rn()); + uint16_t val = reg<uint16_t>(instr->Rm()); + result = Crc32Checksum(acc, val, CRC32C_POLY); + break; + } + case CRC32CW: { + uint32_t acc = reg<uint32_t>(instr->Rn()); + uint32_t val = reg<uint32_t>(instr->Rm()); + result = Crc32Checksum(acc, val, CRC32C_POLY); + break; + } + case CRC32CX: { + uint32_t acc = reg<uint32_t>(instr->Rn()); + uint64_t val = reg<uint64_t>(instr->Rm()); + result = Crc32Checksum(acc, val, CRC32C_POLY); + reg_size = kWRegSize; + break; + } + default: VIXL_UNIMPLEMENTED(); + } + + if (shift_op != NO_SHIFT) { + // Shift distance encoded in the least-significant five/six bits of the + // register. + int mask = (instr->SixtyFourBits() == 1) ? 0x3f : 0x1f; + unsigned shift = wreg(instr->Rm()) & mask; + result = ShiftOperand(reg_size, reg(reg_size, instr->Rn()), shift_op, + shift); + } + set_reg(reg_size, instr->Rd(), result); +} + + +// The algorithm used is adapted from the one described in section 8.2 of +// Hacker's Delight, by Henry S. Warren, Jr. +// It assumes that a right shift on a signed integer is an arithmetic shift. +// Type T must be either uint64_t or int64_t. +template <typename T> +static T MultiplyHigh(T u, T v) { + uint64_t u0, v0, w0; + T u1, v1, w1, w2, t; + + VIXL_ASSERT(sizeof(u) == sizeof(u0)); + + u0 = u & 0xffffffff; + u1 = u >> 32; + v0 = v & 0xffffffff; + v1 = v >> 32; + + w0 = u0 * v0; + t = u1 * v0 + (w0 >> 32); + w1 = t & 0xffffffff; + w2 = t >> 32; + w1 = u0 * v1 + w1; + + return u1 * v1 + w2 + (w1 >> 32); +} + + +void Simulator::VisitDataProcessing3Source(const Instruction* instr) { + unsigned reg_size = instr->SixtyFourBits() ? kXRegSize : kWRegSize; + + int64_t result = 0; + // Extract and sign- or zero-extend 32-bit arguments for widening operations. + uint64_t rn_u32 = reg<uint32_t>(instr->Rn()); + uint64_t rm_u32 = reg<uint32_t>(instr->Rm()); + int64_t rn_s32 = reg<int32_t>(instr->Rn()); + int64_t rm_s32 = reg<int32_t>(instr->Rm()); + switch (instr->Mask(DataProcessing3SourceMask)) { + case MADD_w: + case MADD_x: + result = xreg(instr->Ra()) + (xreg(instr->Rn()) * xreg(instr->Rm())); + break; + case MSUB_w: + case MSUB_x: + result = xreg(instr->Ra()) - (xreg(instr->Rn()) * xreg(instr->Rm())); + break; + case SMADDL_x: result = xreg(instr->Ra()) + (rn_s32 * rm_s32); break; + case SMSUBL_x: result = xreg(instr->Ra()) - (rn_s32 * rm_s32); break; + case UMADDL_x: result = xreg(instr->Ra()) + (rn_u32 * rm_u32); break; + case UMSUBL_x: result = xreg(instr->Ra()) - (rn_u32 * rm_u32); break; + case UMULH_x: + result = MultiplyHigh(reg<uint64_t>(instr->Rn()), + reg<uint64_t>(instr->Rm())); + break; + case SMULH_x: + result = MultiplyHigh(xreg(instr->Rn()), xreg(instr->Rm())); + break; + default: VIXL_UNIMPLEMENTED(); + } + set_reg(reg_size, instr->Rd(), result); +} + + +void Simulator::VisitBitfield(const Instruction* instr) { + unsigned reg_size = instr->SixtyFourBits() ? kXRegSize : kWRegSize; + int64_t reg_mask = instr->SixtyFourBits() ? kXRegMask : kWRegMask; + int64_t R = instr->ImmR(); + int64_t S = instr->ImmS(); + int64_t diff = S - R; + int64_t mask; + if (diff >= 0) { + mask = (diff < (reg_size - 1)) ? (INT64_C(1) << (diff + 1)) - 1 + : reg_mask; + } else { + mask = (INT64_C(1) << (S + 1)) - 1; + mask = (static_cast<uint64_t>(mask) >> R) | (mask << (reg_size - R)); + diff += reg_size; + } + + // inzero indicates if the extracted bitfield is inserted into the + // destination register value or in zero. + // If extend is true, extend the sign of the extracted bitfield. + bool inzero = false; + bool extend = false; + switch (instr->Mask(BitfieldMask)) { + case BFM_x: + case BFM_w: + break; + case SBFM_x: + case SBFM_w: + inzero = true; + extend = true; + break; + case UBFM_x: + case UBFM_w: + inzero = true; + break; + default: + VIXL_UNIMPLEMENTED(); + } + + int64_t dst = inzero ? 0 : reg(reg_size, instr->Rd()); + int64_t src = reg(reg_size, instr->Rn()); + // Rotate source bitfield into place. + int64_t result = (static_cast<uint64_t>(src) >> R) | (src << (reg_size - R)); + // Determine the sign extension. + int64_t topbits = ((INT64_C(1) << (reg_size - diff - 1)) - 1) << (diff + 1); + int64_t signbits = extend && ((src >> S) & 1) ? topbits : 0; + + // Merge sign extension, dest/zero and bitfield. + result = signbits | (result & mask) | (dst & ~mask); + + set_reg(reg_size, instr->Rd(), result); +} + + +void Simulator::VisitExtract(const Instruction* instr) { + unsigned lsb = instr->ImmS(); + unsigned reg_size = (instr->SixtyFourBits() == 1) ? kXRegSize + : kWRegSize; + uint64_t low_res = static_cast<uint64_t>(reg(reg_size, instr->Rm())) >> lsb; + uint64_t high_res = + (lsb == 0) ? 0 : reg(reg_size, instr->Rn()) << (reg_size - lsb); + set_reg(reg_size, instr->Rd(), low_res | high_res); +} + + +void Simulator::VisitFPImmediate(const Instruction* instr) { + AssertSupportedFPCR(); + + unsigned dest = instr->Rd(); + switch (instr->Mask(FPImmediateMask)) { + case FMOV_s_imm: set_sreg(dest, instr->ImmFP32()); break; + case FMOV_d_imm: set_dreg(dest, instr->ImmFP64()); break; + default: VIXL_UNREACHABLE(); + } +} + + +void Simulator::VisitFPIntegerConvert(const Instruction* instr) { + AssertSupportedFPCR(); + + unsigned dst = instr->Rd(); + unsigned src = instr->Rn(); + + FPRounding round = RMode(); + + switch (instr->Mask(FPIntegerConvertMask)) { + case FCVTAS_ws: set_wreg(dst, FPToInt32(sreg(src), FPTieAway)); break; + case FCVTAS_xs: set_xreg(dst, FPToInt64(sreg(src), FPTieAway)); break; + case FCVTAS_wd: set_wreg(dst, FPToInt32(dreg(src), FPTieAway)); break; + case FCVTAS_xd: set_xreg(dst, FPToInt64(dreg(src), FPTieAway)); break; + case FCVTAU_ws: set_wreg(dst, FPToUInt32(sreg(src), FPTieAway)); break; + case FCVTAU_xs: set_xreg(dst, FPToUInt64(sreg(src), FPTieAway)); break; + case FCVTAU_wd: set_wreg(dst, FPToUInt32(dreg(src), FPTieAway)); break; + case FCVTAU_xd: set_xreg(dst, FPToUInt64(dreg(src), FPTieAway)); break; + case FCVTMS_ws: + set_wreg(dst, FPToInt32(sreg(src), FPNegativeInfinity)); + break; + case FCVTMS_xs: + set_xreg(dst, FPToInt64(sreg(src), FPNegativeInfinity)); + break; + case FCVTMS_wd: + set_wreg(dst, FPToInt32(dreg(src), FPNegativeInfinity)); + break; + case FCVTMS_xd: + set_xreg(dst, FPToInt64(dreg(src), FPNegativeInfinity)); + break; + case FCVTMU_ws: + set_wreg(dst, FPToUInt32(sreg(src), FPNegativeInfinity)); + break; + case FCVTMU_xs: + set_xreg(dst, FPToUInt64(sreg(src), FPNegativeInfinity)); + break; + case FCVTMU_wd: + set_wreg(dst, FPToUInt32(dreg(src), FPNegativeInfinity)); + break; + case FCVTMU_xd: + set_xreg(dst, FPToUInt64(dreg(src), FPNegativeInfinity)); + break; + case FCVTPS_ws: + set_wreg(dst, FPToInt32(sreg(src), FPPositiveInfinity)); + break; + case FCVTPS_xs: + set_xreg(dst, FPToInt64(sreg(src), FPPositiveInfinity)); + break; + case FCVTPS_wd: + set_wreg(dst, FPToInt32(dreg(src), FPPositiveInfinity)); + break; + case FCVTPS_xd: + set_xreg(dst, FPToInt64(dreg(src), FPPositiveInfinity)); + break; + case FCVTPU_ws: + set_wreg(dst, FPToUInt32(sreg(src), FPPositiveInfinity)); + break; + case FCVTPU_xs: + set_xreg(dst, FPToUInt64(sreg(src), FPPositiveInfinity)); + break; + case FCVTPU_wd: + set_wreg(dst, FPToUInt32(dreg(src), FPPositiveInfinity)); + break; + case FCVTPU_xd: + set_xreg(dst, FPToUInt64(dreg(src), FPPositiveInfinity)); + break; + case FCVTNS_ws: set_wreg(dst, FPToInt32(sreg(src), FPTieEven)); break; + case FCVTNS_xs: set_xreg(dst, FPToInt64(sreg(src), FPTieEven)); break; + case FCVTNS_wd: set_wreg(dst, FPToInt32(dreg(src), FPTieEven)); break; + case FCVTNS_xd: set_xreg(dst, FPToInt64(dreg(src), FPTieEven)); break; + case FCVTNU_ws: set_wreg(dst, FPToUInt32(sreg(src), FPTieEven)); break; + case FCVTNU_xs: set_xreg(dst, FPToUInt64(sreg(src), FPTieEven)); break; + case FCVTNU_wd: set_wreg(dst, FPToUInt32(dreg(src), FPTieEven)); break; + case FCVTNU_xd: set_xreg(dst, FPToUInt64(dreg(src), FPTieEven)); break; + case FCVTZS_ws: set_wreg(dst, FPToInt32(sreg(src), FPZero)); break; + case FCVTZS_xs: set_xreg(dst, FPToInt64(sreg(src), FPZero)); break; + case FCVTZS_wd: set_wreg(dst, FPToInt32(dreg(src), FPZero)); break; + case FCVTZS_xd: set_xreg(dst, FPToInt64(dreg(src), FPZero)); break; + case FCVTZU_ws: set_wreg(dst, FPToUInt32(sreg(src), FPZero)); break; + case FCVTZU_xs: set_xreg(dst, FPToUInt64(sreg(src), FPZero)); break; + case FCVTZU_wd: set_wreg(dst, FPToUInt32(dreg(src), FPZero)); break; + case FCVTZU_xd: set_xreg(dst, FPToUInt64(dreg(src), FPZero)); break; + case FJCVTZS: set_wreg(dst, FPToFixedJS(dreg(src))); break; + case FMOV_ws: set_wreg(dst, sreg_bits(src)); break; + case FMOV_xd: set_xreg(dst, dreg_bits(src)); break; + case FMOV_sw: set_sreg_bits(dst, wreg(src)); break; + case FMOV_dx: set_dreg_bits(dst, xreg(src)); break; + case FMOV_d1_x: + LogicVRegister(vreg(dst)).SetUint(kFormatD, 1, xreg(src)); + break; + case FMOV_x_d1: + set_xreg(dst, LogicVRegister(vreg(src)).Uint(kFormatD, 1)); + break; + + // A 32-bit input can be handled in the same way as a 64-bit input, since + // the sign- or zero-extension will not affect the conversion. + case SCVTF_dx: set_dreg(dst, FixedToDouble(xreg(src), 0, round)); break; + case SCVTF_dw: set_dreg(dst, FixedToDouble(wreg(src), 0, round)); break; + case UCVTF_dx: set_dreg(dst, UFixedToDouble(xreg(src), 0, round)); break; + case UCVTF_dw: { + set_dreg(dst, UFixedToDouble(static_cast<uint32_t>(wreg(src)), 0, round)); + break; + } + case SCVTF_sx: set_sreg(dst, FixedToFloat(xreg(src), 0, round)); break; + case SCVTF_sw: set_sreg(dst, FixedToFloat(wreg(src), 0, round)); break; + case UCVTF_sx: set_sreg(dst, UFixedToFloat(xreg(src), 0, round)); break; + case UCVTF_sw: { + set_sreg(dst, UFixedToFloat(static_cast<uint32_t>(wreg(src)), 0, round)); + break; + } + + default: VIXL_UNREACHABLE(); + } +} + + +void Simulator::VisitFPFixedPointConvert(const Instruction* instr) { + AssertSupportedFPCR(); + + unsigned dst = instr->Rd(); + unsigned src = instr->Rn(); + int fbits = 64 - instr->FPScale(); + + FPRounding round = RMode(); + + switch (instr->Mask(FPFixedPointConvertMask)) { + // A 32-bit input can be handled in the same way as a 64-bit input, since + // the sign- or zero-extension will not affect the conversion. + case SCVTF_dx_fixed: + set_dreg(dst, FixedToDouble(xreg(src), fbits, round)); + break; + case SCVTF_dw_fixed: + set_dreg(dst, FixedToDouble(wreg(src), fbits, round)); + break; + case UCVTF_dx_fixed: + set_dreg(dst, UFixedToDouble(xreg(src), fbits, round)); + break; + case UCVTF_dw_fixed: { + set_dreg(dst, + UFixedToDouble(static_cast<uint32_t>(wreg(src)), fbits, round)); + break; + } + case SCVTF_sx_fixed: + set_sreg(dst, FixedToFloat(xreg(src), fbits, round)); + break; + case SCVTF_sw_fixed: + set_sreg(dst, FixedToFloat(wreg(src), fbits, round)); + break; + case UCVTF_sx_fixed: + set_sreg(dst, UFixedToFloat(xreg(src), fbits, round)); + break; + case UCVTF_sw_fixed: { + set_sreg(dst, + UFixedToFloat(static_cast<uint32_t>(wreg(src)), fbits, round)); + break; + } + case FCVTZS_xd_fixed: + set_xreg(dst, FPToInt64(dreg(src) * std::pow(2.0, fbits), FPZero)); + break; + case FCVTZS_wd_fixed: + set_wreg(dst, FPToInt32(dreg(src) * std::pow(2.0, fbits), FPZero)); + break; + case FCVTZU_xd_fixed: + set_xreg(dst, FPToUInt64(dreg(src) * std::pow(2.0, fbits), FPZero)); + break; + case FCVTZU_wd_fixed: + set_wreg(dst, FPToUInt32(dreg(src) * std::pow(2.0, fbits), FPZero)); + break; + case FCVTZS_xs_fixed: + set_xreg(dst, FPToInt64(sreg(src) * std::pow(2.0f, fbits), FPZero)); + break; + case FCVTZS_ws_fixed: + set_wreg(dst, FPToInt32(sreg(src) * std::pow(2.0f, fbits), FPZero)); + break; + case FCVTZU_xs_fixed: + set_xreg(dst, FPToUInt64(sreg(src) * std::pow(2.0f, fbits), FPZero)); + break; + case FCVTZU_ws_fixed: + set_wreg(dst, FPToUInt32(sreg(src) * std::pow(2.0f, fbits), FPZero)); + break; + default: VIXL_UNREACHABLE(); + } +} + + +void Simulator::VisitFPCompare(const Instruction* instr) { + AssertSupportedFPCR(); + + FPTrapFlags trap = DisableTrap; + switch (instr->Mask(FPCompareMask)) { + case FCMPE_s: trap = EnableTrap; VIXL_FALLTHROUGH(); + case FCMP_s: FPCompare(sreg(instr->Rn()), sreg(instr->Rm()), trap); break; + case FCMPE_d: trap = EnableTrap; VIXL_FALLTHROUGH(); + case FCMP_d: FPCompare(dreg(instr->Rn()), dreg(instr->Rm()), trap); break; + case FCMPE_s_zero: trap = EnableTrap; VIXL_FALLTHROUGH(); + case FCMP_s_zero: FPCompare(sreg(instr->Rn()), 0.0f, trap); break; + case FCMPE_d_zero: trap = EnableTrap; VIXL_FALLTHROUGH(); + case FCMP_d_zero: FPCompare(dreg(instr->Rn()), 0.0, trap); break; + default: VIXL_UNIMPLEMENTED(); + } +} + + +void Simulator::VisitFPConditionalCompare(const Instruction* instr) { + AssertSupportedFPCR(); + + FPTrapFlags trap = DisableTrap; + switch (instr->Mask(FPConditionalCompareMask)) { + case FCCMPE_s: trap = EnableTrap; + VIXL_FALLTHROUGH(); + case FCCMP_s: + if (ConditionPassed(instr->Condition())) { + FPCompare(sreg(instr->Rn()), sreg(instr->Rm()), trap); + } else { + nzcv().SetFlags(instr->Nzcv()); + LogSystemRegister(NZCV); + } + break; + case FCCMPE_d: trap = EnableTrap; + VIXL_FALLTHROUGH(); + case FCCMP_d: + if (ConditionPassed(instr->Condition())) { + FPCompare(dreg(instr->Rn()), dreg(instr->Rm()), trap); + } else { + nzcv().SetFlags(instr->Nzcv()); + LogSystemRegister(NZCV); + } + break; + default: VIXL_UNIMPLEMENTED(); + } +} + + +void Simulator::VisitFPConditionalSelect(const Instruction* instr) { + AssertSupportedFPCR(); + + Instr selected; + if (ConditionPassed(instr->Condition())) { + selected = instr->Rn(); + } else { + selected = instr->Rm(); + } + + switch (instr->Mask(FPConditionalSelectMask)) { + case FCSEL_s: set_sreg(instr->Rd(), sreg(selected)); break; + case FCSEL_d: set_dreg(instr->Rd(), dreg(selected)); break; + default: VIXL_UNIMPLEMENTED(); + } +} + + +void Simulator::VisitFPDataProcessing1Source(const Instruction* instr) { + AssertSupportedFPCR(); + + FPRounding fpcr_rounding = static_cast<FPRounding>(fpcr().RMode()); + VectorFormat vform = (instr->Mask(FP64) == FP64) ? kFormatD : kFormatS; + SimVRegister& rd = vreg(instr->Rd()); + SimVRegister& rn = vreg(instr->Rn()); + bool inexact_exception = false; + + unsigned fd = instr->Rd(); + unsigned fn = instr->Rn(); + + switch (instr->Mask(FPDataProcessing1SourceMask)) { + case FMOV_s: set_sreg(fd, sreg(fn)); return; + case FMOV_d: set_dreg(fd, dreg(fn)); return; + case FABS_s: fabs_(kFormatS, vreg(fd), vreg(fn)); return; + case FABS_d: fabs_(kFormatD, vreg(fd), vreg(fn)); return; + case FNEG_s: fneg(kFormatS, vreg(fd), vreg(fn)); return; + case FNEG_d: fneg(kFormatD, vreg(fd), vreg(fn)); return; + case FCVT_ds: + set_dreg(fd, FPToDouble(sreg(fn), ReadDN())); + return; + case FCVT_sd: + set_sreg(fd, FPToFloat(dreg(fn), FPTieEven, ReadDN())); + return; + case FCVT_hs: + set_hreg(fd, Float16ToRawbits(FPToFloat16(sreg(fn), FPTieEven, ReadDN()))); + return; + case FCVT_sh: + set_sreg(fd, FPToFloat(RawbitsToFloat16(hreg(fn)), ReadDN())); + return; + case FCVT_dh: + set_dreg(fd, FPToDouble(hreg(fn), ReadDN())); + return; + case FCVT_hd: + set_hreg(fd, Float16ToRawbits(FPToFloat16(dreg(fn), FPTieEven, ReadDN()))); + return; + case FSQRT_s: + case FSQRT_d: fsqrt(vform, rd, rn); return; + case FRINTI_s: + case FRINTI_d: break; // Use FPCR rounding mode. + case FRINTX_s: + case FRINTX_d: inexact_exception = true; break; + case FRINTA_s: + case FRINTA_d: fpcr_rounding = FPTieAway; break; + case FRINTM_s: + case FRINTM_d: fpcr_rounding = FPNegativeInfinity; break; + case FRINTN_s: + case FRINTN_d: fpcr_rounding = FPTieEven; break; + case FRINTP_s: + case FRINTP_d: fpcr_rounding = FPPositiveInfinity; break; + case FRINTZ_s: + case FRINTZ_d: fpcr_rounding = FPZero; break; + default: VIXL_UNIMPLEMENTED(); + } + + // Only FRINT* instructions fall through the switch above. + frint(vform, rd, rn, fpcr_rounding, inexact_exception); +} + + +void Simulator::VisitFPDataProcessing2Source(const Instruction* instr) { + AssertSupportedFPCR(); + + VectorFormat vform = (instr->Mask(FP64) == FP64) ? kFormatD : kFormatS; + SimVRegister& rd = vreg(instr->Rd()); + SimVRegister& rn = vreg(instr->Rn()); + SimVRegister& rm = vreg(instr->Rm()); + + switch (instr->Mask(FPDataProcessing2SourceMask)) { + case FADD_s: + case FADD_d: fadd(vform, rd, rn, rm); break; + case FSUB_s: + case FSUB_d: fsub(vform, rd, rn, rm); break; + case FMUL_s: + case FMUL_d: fmul(vform, rd, rn, rm); break; + case FNMUL_s: + case FNMUL_d: fnmul(vform, rd, rn, rm); break; + case FDIV_s: + case FDIV_d: fdiv(vform, rd, rn, rm); break; + case FMAX_s: + case FMAX_d: fmax(vform, rd, rn, rm); break; + case FMIN_s: + case FMIN_d: fmin(vform, rd, rn, rm); break; + case FMAXNM_s: + case FMAXNM_d: fmaxnm(vform, rd, rn, rm); break; + case FMINNM_s: + case FMINNM_d: fminnm(vform, rd, rn, rm); break; + default: + VIXL_UNREACHABLE(); + } +} + + +void Simulator::VisitFPDataProcessing3Source(const Instruction* instr) { + AssertSupportedFPCR(); + + unsigned fd = instr->Rd(); + unsigned fn = instr->Rn(); + unsigned fm = instr->Rm(); + unsigned fa = instr->Ra(); + + switch (instr->Mask(FPDataProcessing3SourceMask)) { + // fd = fa +/- (fn * fm) + case FMADD_s: set_sreg(fd, FPMulAdd(sreg(fa), sreg(fn), sreg(fm))); break; + case FMSUB_s: set_sreg(fd, FPMulAdd(sreg(fa), -sreg(fn), sreg(fm))); break; + case FMADD_d: set_dreg(fd, FPMulAdd(dreg(fa), dreg(fn), dreg(fm))); break; + case FMSUB_d: set_dreg(fd, FPMulAdd(dreg(fa), -dreg(fn), dreg(fm))); break; + // Negated variants of the above. + case FNMADD_s: + set_sreg(fd, FPMulAdd(-sreg(fa), -sreg(fn), sreg(fm))); + break; + case FNMSUB_s: + set_sreg(fd, FPMulAdd(-sreg(fa), sreg(fn), sreg(fm))); + break; + case FNMADD_d: + set_dreg(fd, FPMulAdd(-dreg(fa), -dreg(fn), dreg(fm))); + break; + case FNMSUB_d: + set_dreg(fd, FPMulAdd(-dreg(fa), dreg(fn), dreg(fm))); + break; + default: VIXL_UNIMPLEMENTED(); + } +} + + +bool Simulator::FPProcessNaNs(const Instruction* instr) { + unsigned fd = instr->Rd(); + unsigned fn = instr->Rn(); + unsigned fm = instr->Rm(); + bool done = false; + + if (instr->Mask(FP64) == FP64) { + double result = FPProcessNaNs(dreg(fn), dreg(fm)); + if (std::isnan(result)) { + set_dreg(fd, result); + done = true; + } + } else { + float result = FPProcessNaNs(sreg(fn), sreg(fm)); + if (std::isnan(result)) { + set_sreg(fd, result); + done = true; + } + } + + return done; +} + + +void Simulator::SysOp_W(int op, int64_t val) { + switch (op) { + case IVAU: + case CVAC: + case CVAU: + case CIVAC: { + // Perform a dummy memory access to ensure that we have read access + // to the specified address. + volatile uint8_t y = Read<uint8_t>(val); + USE(y); + // TODO: Implement "case ZVA:". + break; + } + default: + VIXL_UNIMPLEMENTED(); + } +} + + +void Simulator::VisitSystem(const Instruction* instr) { + // Some system instructions hijack their Op and Cp fields to represent a + // range of immediates instead of indicating a different instruction. This + // makes the decoding tricky. + if (instr->Mask(SystemExclusiveMonitorFMask) == SystemExclusiveMonitorFixed) { + VIXL_ASSERT(instr->Mask(SystemExclusiveMonitorMask) == CLREX); + switch (instr->Mask(SystemExclusiveMonitorMask)) { + case CLREX: { + PrintExclusiveAccessWarning(); + ClearLocalMonitor(); + break; + } + } + } else if (instr->Mask(SystemSysRegFMask) == SystemSysRegFixed) { + switch (instr->Mask(SystemSysRegMask)) { + case MRS: { + switch (instr->ImmSystemRegister()) { + case NZCV: set_xreg(instr->Rt(), nzcv().RawValue()); break; + case FPCR: set_xreg(instr->Rt(), fpcr().RawValue()); break; + default: VIXL_UNIMPLEMENTED(); + } + break; + } + case MSR: { + switch (instr->ImmSystemRegister()) { + case NZCV: + nzcv().SetRawValue(wreg(instr->Rt())); + LogSystemRegister(NZCV); + break; + case FPCR: + fpcr().SetRawValue(wreg(instr->Rt())); + LogSystemRegister(FPCR); + break; + default: VIXL_UNIMPLEMENTED(); + } + break; + } + } + } else if (instr->Mask(SystemHintFMask) == SystemHintFixed) { + VIXL_ASSERT(instr->Mask(SystemHintMask) == HINT); + switch (instr->ImmHint()) { + case NOP: break; + case CSDB: break; + default: VIXL_UNIMPLEMENTED(); + } + } else if (instr->Mask(MemBarrierFMask) == MemBarrierFixed) { + js::jit::AtomicOperations::fenceSeqCst(); + } else if ((instr->Mask(SystemSysFMask) == SystemSysFixed)) { + switch (instr->Mask(SystemSysMask)) { + case SYS: SysOp_W(instr->SysOp(), xreg(instr->Rt())); break; + default: VIXL_UNIMPLEMENTED(); + } + } else { + VIXL_UNIMPLEMENTED(); + } +} + + +void Simulator::VisitCrypto2RegSHA(const Instruction* instr) { + VisitUnimplemented(instr); +} + + +void Simulator::VisitCrypto3RegSHA(const Instruction* instr) { + VisitUnimplemented(instr); +} + + +void Simulator::VisitCryptoAES(const Instruction* instr) { + VisitUnimplemented(instr); +} + + +void Simulator::VisitNEON2RegMisc(const Instruction* instr) { + NEONFormatDecoder nfd(instr); + VectorFormat vf = nfd.GetVectorFormat(); + + static const NEONFormatMap map_lp = { + {23, 22, 30}, {NF_4H, NF_8H, NF_2S, NF_4S, NF_1D, NF_2D} + }; + VectorFormat vf_lp = nfd.GetVectorFormat(&map_lp); + + static const NEONFormatMap map_fcvtl = { + {22}, {NF_4S, NF_2D} + }; + VectorFormat vf_fcvtl = nfd.GetVectorFormat(&map_fcvtl); + + static const NEONFormatMap map_fcvtn = { + {22, 30}, {NF_4H, NF_8H, NF_2S, NF_4S} + }; + VectorFormat vf_fcvtn = nfd.GetVectorFormat(&map_fcvtn); + + SimVRegister& rd = vreg(instr->Rd()); + SimVRegister& rn = vreg(instr->Rn()); + + if (instr->Mask(NEON2RegMiscOpcode) <= NEON_NEG_opcode) { + // These instructions all use a two bit size field, except NOT and RBIT, + // which use the field to encode the operation. + switch (instr->Mask(NEON2RegMiscMask)) { + case NEON_REV64: rev64(vf, rd, rn); break; + case NEON_REV32: rev32(vf, rd, rn); break; + case NEON_REV16: rev16(vf, rd, rn); break; + case NEON_SUQADD: suqadd(vf, rd, rn); break; + case NEON_USQADD: usqadd(vf, rd, rn); break; + case NEON_CLS: cls(vf, rd, rn); break; + case NEON_CLZ: clz(vf, rd, rn); break; + case NEON_CNT: cnt(vf, rd, rn); break; + case NEON_SQABS: abs(vf, rd, rn).SignedSaturate(vf); break; + case NEON_SQNEG: neg(vf, rd, rn).SignedSaturate(vf); break; + case NEON_CMGT_zero: cmp(vf, rd, rn, 0, gt); break; + case NEON_CMGE_zero: cmp(vf, rd, rn, 0, ge); break; + case NEON_CMEQ_zero: cmp(vf, rd, rn, 0, eq); break; + case NEON_CMLE_zero: cmp(vf, rd, rn, 0, le); break; + case NEON_CMLT_zero: cmp(vf, rd, rn, 0, lt); break; + case NEON_ABS: abs(vf, rd, rn); break; + case NEON_NEG: neg(vf, rd, rn); break; + case NEON_SADDLP: saddlp(vf_lp, rd, rn); break; + case NEON_UADDLP: uaddlp(vf_lp, rd, rn); break; + case NEON_SADALP: sadalp(vf_lp, rd, rn); break; + case NEON_UADALP: uadalp(vf_lp, rd, rn); break; + case NEON_RBIT_NOT: + vf = nfd.GetVectorFormat(nfd.LogicalFormatMap()); + switch (instr->FPType()) { + case 0: not_(vf, rd, rn); break; + case 1: rbit(vf, rd, rn);; break; + default: + VIXL_UNIMPLEMENTED(); + } + break; + } + } else { + VectorFormat fpf = nfd.GetVectorFormat(nfd.FPFormatMap()); + FPRounding fpcr_rounding = static_cast<FPRounding>(fpcr().RMode()); + bool inexact_exception = false; + + // These instructions all use a one bit size field, except XTN, SQXTUN, + // SHLL, SQXTN and UQXTN, which use a two bit size field. + switch (instr->Mask(NEON2RegMiscFPMask)) { + case NEON_FABS: fabs_(fpf, rd, rn); return; + case NEON_FNEG: fneg(fpf, rd, rn); return; + case NEON_FSQRT: fsqrt(fpf, rd, rn); return; + case NEON_FCVTL: + if (instr->Mask(NEON_Q)) { + fcvtl2(vf_fcvtl, rd, rn); + } else { + fcvtl(vf_fcvtl, rd, rn); + } + return; + case NEON_FCVTN: + if (instr->Mask(NEON_Q)) { + fcvtn2(vf_fcvtn, rd, rn); + } else { + fcvtn(vf_fcvtn, rd, rn); + } + return; + case NEON_FCVTXN: + if (instr->Mask(NEON_Q)) { + fcvtxn2(vf_fcvtn, rd, rn); + } else { + fcvtxn(vf_fcvtn, rd, rn); + } + return; + + // The following instructions break from the switch statement, rather + // than return. + case NEON_FRINTI: break; // Use FPCR rounding mode. + case NEON_FRINTX: inexact_exception = true; break; + case NEON_FRINTA: fpcr_rounding = FPTieAway; break; + case NEON_FRINTM: fpcr_rounding = FPNegativeInfinity; break; + case NEON_FRINTN: fpcr_rounding = FPTieEven; break; + case NEON_FRINTP: fpcr_rounding = FPPositiveInfinity; break; + case NEON_FRINTZ: fpcr_rounding = FPZero; break; + + case NEON_FCVTNS: fcvts(fpf, rd, rn, FPTieEven); return; + case NEON_FCVTNU: fcvtu(fpf, rd, rn, FPTieEven); return; + case NEON_FCVTPS: fcvts(fpf, rd, rn, FPPositiveInfinity); return; + case NEON_FCVTPU: fcvtu(fpf, rd, rn, FPPositiveInfinity); return; + case NEON_FCVTMS: fcvts(fpf, rd, rn, FPNegativeInfinity); return; + case NEON_FCVTMU: fcvtu(fpf, rd, rn, FPNegativeInfinity); return; + case NEON_FCVTZS: fcvts(fpf, rd, rn, FPZero); return; + case NEON_FCVTZU: fcvtu(fpf, rd, rn, FPZero); return; + case NEON_FCVTAS: fcvts(fpf, rd, rn, FPTieAway); return; + case NEON_FCVTAU: fcvtu(fpf, rd, rn, FPTieAway); return; + case NEON_SCVTF: scvtf(fpf, rd, rn, 0, fpcr_rounding); return; + case NEON_UCVTF: ucvtf(fpf, rd, rn, 0, fpcr_rounding); return; + case NEON_URSQRTE: ursqrte(fpf, rd, rn); return; + case NEON_URECPE: urecpe(fpf, rd, rn); return; + case NEON_FRSQRTE: frsqrte(fpf, rd, rn); return; + case NEON_FRECPE: frecpe(fpf, rd, rn, fpcr_rounding); return; + case NEON_FCMGT_zero: fcmp_zero(fpf, rd, rn, gt); return; + case NEON_FCMGE_zero: fcmp_zero(fpf, rd, rn, ge); return; + case NEON_FCMEQ_zero: fcmp_zero(fpf, rd, rn, eq); return; + case NEON_FCMLE_zero: fcmp_zero(fpf, rd, rn, le); return; + case NEON_FCMLT_zero: fcmp_zero(fpf, rd, rn, lt); return; + default: + if ((NEON_XTN_opcode <= instr->Mask(NEON2RegMiscOpcode)) && + (instr->Mask(NEON2RegMiscOpcode) <= NEON_UQXTN_opcode)) { + switch (instr->Mask(NEON2RegMiscMask)) { + case NEON_XTN: xtn(vf, rd, rn); return; + case NEON_SQXTN: sqxtn(vf, rd, rn); return; + case NEON_UQXTN: uqxtn(vf, rd, rn); return; + case NEON_SQXTUN: sqxtun(vf, rd, rn); return; + case NEON_SHLL: + vf = nfd.GetVectorFormat(nfd.LongIntegerFormatMap()); + if (instr->Mask(NEON_Q)) { + shll2(vf, rd, rn); + } else { + shll(vf, rd, rn); + } + return; + default: + VIXL_UNIMPLEMENTED(); + } + } else { + VIXL_UNIMPLEMENTED(); + } + } + + // Only FRINT* instructions fall through the switch above. + frint(fpf, rd, rn, fpcr_rounding, inexact_exception); + } +} + + +void Simulator::VisitNEON3Same(const Instruction* instr) { + NEONFormatDecoder nfd(instr); + SimVRegister& rd = vreg(instr->Rd()); + SimVRegister& rn = vreg(instr->Rn()); + SimVRegister& rm = vreg(instr->Rm()); + + if (instr->Mask(NEON3SameLogicalFMask) == NEON3SameLogicalFixed) { + VectorFormat vf = nfd.GetVectorFormat(nfd.LogicalFormatMap()); + switch (instr->Mask(NEON3SameLogicalMask)) { + case NEON_AND: and_(vf, rd, rn, rm); break; + case NEON_ORR: orr(vf, rd, rn, rm); break; + case NEON_ORN: orn(vf, rd, rn, rm); break; + case NEON_EOR: eor(vf, rd, rn, rm); break; + case NEON_BIC: bic(vf, rd, rn, rm); break; + case NEON_BIF: bif(vf, rd, rn, rm); break; + case NEON_BIT: bit(vf, rd, rn, rm); break; + case NEON_BSL: bsl(vf, rd, rn, rm); break; + default: + VIXL_UNIMPLEMENTED(); + } + } else if (instr->Mask(NEON3SameFPFMask) == NEON3SameFPFixed) { + VectorFormat vf = nfd.GetVectorFormat(nfd.FPFormatMap()); + switch (instr->Mask(NEON3SameFPMask)) { + case NEON_FADD: fadd(vf, rd, rn, rm); break; + case NEON_FSUB: fsub(vf, rd, rn, rm); break; + case NEON_FMUL: fmul(vf, rd, rn, rm); break; + case NEON_FDIV: fdiv(vf, rd, rn, rm); break; + case NEON_FMAX: fmax(vf, rd, rn, rm); break; + case NEON_FMIN: fmin(vf, rd, rn, rm); break; + case NEON_FMAXNM: fmaxnm(vf, rd, rn, rm); break; + case NEON_FMINNM: fminnm(vf, rd, rn, rm); break; + case NEON_FMLA: fmla(vf, rd, rn, rm); break; + case NEON_FMLS: fmls(vf, rd, rn, rm); break; + case NEON_FMULX: fmulx(vf, rd, rn, rm); break; + case NEON_FACGE: fabscmp(vf, rd, rn, rm, ge); break; + case NEON_FACGT: fabscmp(vf, rd, rn, rm, gt); break; + case NEON_FCMEQ: fcmp(vf, rd, rn, rm, eq); break; + case NEON_FCMGE: fcmp(vf, rd, rn, rm, ge); break; + case NEON_FCMGT: fcmp(vf, rd, rn, rm, gt); break; + case NEON_FRECPS: frecps(vf, rd, rn, rm); break; + case NEON_FRSQRTS: frsqrts(vf, rd, rn, rm); break; + case NEON_FABD: fabd(vf, rd, rn, rm); break; + case NEON_FADDP: faddp(vf, rd, rn, rm); break; + case NEON_FMAXP: fmaxp(vf, rd, rn, rm); break; + case NEON_FMAXNMP: fmaxnmp(vf, rd, rn, rm); break; + case NEON_FMINP: fminp(vf, rd, rn, rm); break; + case NEON_FMINNMP: fminnmp(vf, rd, rn, rm); break; + default: + VIXL_UNIMPLEMENTED(); + } + } else { + VectorFormat vf = nfd.GetVectorFormat(); + switch (instr->Mask(NEON3SameMask)) { + case NEON_ADD: add(vf, rd, rn, rm); break; + case NEON_ADDP: addp(vf, rd, rn, rm); break; + case NEON_CMEQ: cmp(vf, rd, rn, rm, eq); break; + case NEON_CMGE: cmp(vf, rd, rn, rm, ge); break; + case NEON_CMGT: cmp(vf, rd, rn, rm, gt); break; + case NEON_CMHI: cmp(vf, rd, rn, rm, hi); break; + case NEON_CMHS: cmp(vf, rd, rn, rm, hs); break; + case NEON_CMTST: cmptst(vf, rd, rn, rm); break; + case NEON_MLS: mls(vf, rd, rn, rm); break; + case NEON_MLA: mla(vf, rd, rn, rm); break; + case NEON_MUL: mul(vf, rd, rn, rm); break; + case NEON_PMUL: pmul(vf, rd, rn, rm); break; + case NEON_SMAX: smax(vf, rd, rn, rm); break; + case NEON_SMAXP: smaxp(vf, rd, rn, rm); break; + case NEON_SMIN: smin(vf, rd, rn, rm); break; + case NEON_SMINP: sminp(vf, rd, rn, rm); break; + case NEON_SUB: sub(vf, rd, rn, rm); break; + case NEON_UMAX: umax(vf, rd, rn, rm); break; + case NEON_UMAXP: umaxp(vf, rd, rn, rm); break; + case NEON_UMIN: umin(vf, rd, rn, rm); break; + case NEON_UMINP: uminp(vf, rd, rn, rm); break; + case NEON_SSHL: sshl(vf, rd, rn, rm); break; + case NEON_USHL: ushl(vf, rd, rn, rm); break; + case NEON_SABD: absdiff(vf, rd, rn, rm, true); break; + case NEON_UABD: absdiff(vf, rd, rn, rm, false); break; + case NEON_SABA: saba(vf, rd, rn, rm); break; + case NEON_UABA: uaba(vf, rd, rn, rm); break; + case NEON_UQADD: add(vf, rd, rn, rm).UnsignedSaturate(vf); break; + case NEON_SQADD: add(vf, rd, rn, rm).SignedSaturate(vf); break; + case NEON_UQSUB: sub(vf, rd, rn, rm).UnsignedSaturate(vf); break; + case NEON_SQSUB: sub(vf, rd, rn, rm).SignedSaturate(vf); break; + case NEON_SQDMULH: sqdmulh(vf, rd, rn, rm); break; + case NEON_SQRDMULH: sqrdmulh(vf, rd, rn, rm); break; + case NEON_UQSHL: ushl(vf, rd, rn, rm).UnsignedSaturate(vf); break; + case NEON_SQSHL: sshl(vf, rd, rn, rm).SignedSaturate(vf); break; + case NEON_URSHL: ushl(vf, rd, rn, rm).Round(vf); break; + case NEON_SRSHL: sshl(vf, rd, rn, rm).Round(vf); break; + case NEON_UQRSHL: + ushl(vf, rd, rn, rm).Round(vf).UnsignedSaturate(vf); + break; + case NEON_SQRSHL: + sshl(vf, rd, rn, rm).Round(vf).SignedSaturate(vf); + break; + case NEON_UHADD: + add(vf, rd, rn, rm).Uhalve(vf); + break; + case NEON_URHADD: + add(vf, rd, rn, rm).Uhalve(vf).Round(vf); + break; + case NEON_SHADD: + add(vf, rd, rn, rm).Halve(vf); + break; + case NEON_SRHADD: + add(vf, rd, rn, rm).Halve(vf).Round(vf); + break; + case NEON_UHSUB: + sub(vf, rd, rn, rm).Uhalve(vf); + break; + case NEON_SHSUB: + sub(vf, rd, rn, rm).Halve(vf); + break; + default: + VIXL_UNIMPLEMENTED(); + } + } +} + + +void Simulator::VisitNEON3Different(const Instruction* instr) { + NEONFormatDecoder nfd(instr); + VectorFormat vf = nfd.GetVectorFormat(); + VectorFormat vf_l = nfd.GetVectorFormat(nfd.LongIntegerFormatMap()); + + SimVRegister& rd = vreg(instr->Rd()); + SimVRegister& rn = vreg(instr->Rn()); + SimVRegister& rm = vreg(instr->Rm()); + + switch (instr->Mask(NEON3DifferentMask)) { + case NEON_PMULL: pmull(vf_l, rd, rn, rm); break; + case NEON_PMULL2: pmull2(vf_l, rd, rn, rm); break; + case NEON_UADDL: uaddl(vf_l, rd, rn, rm); break; + case NEON_UADDL2: uaddl2(vf_l, rd, rn, rm); break; + case NEON_SADDL: saddl(vf_l, rd, rn, rm); break; + case NEON_SADDL2: saddl2(vf_l, rd, rn, rm); break; + case NEON_USUBL: usubl(vf_l, rd, rn, rm); break; + case NEON_USUBL2: usubl2(vf_l, rd, rn, rm); break; + case NEON_SSUBL: ssubl(vf_l, rd, rn, rm); break; + case NEON_SSUBL2: ssubl2(vf_l, rd, rn, rm); break; + case NEON_SABAL: sabal(vf_l, rd, rn, rm); break; + case NEON_SABAL2: sabal2(vf_l, rd, rn, rm); break; + case NEON_UABAL: uabal(vf_l, rd, rn, rm); break; + case NEON_UABAL2: uabal2(vf_l, rd, rn, rm); break; + case NEON_SABDL: sabdl(vf_l, rd, rn, rm); break; + case NEON_SABDL2: sabdl2(vf_l, rd, rn, rm); break; + case NEON_UABDL: uabdl(vf_l, rd, rn, rm); break; + case NEON_UABDL2: uabdl2(vf_l, rd, rn, rm); break; + case NEON_SMLAL: smlal(vf_l, rd, rn, rm); break; + case NEON_SMLAL2: smlal2(vf_l, rd, rn, rm); break; + case NEON_UMLAL: umlal(vf_l, rd, rn, rm); break; + case NEON_UMLAL2: umlal2(vf_l, rd, rn, rm); break; + case NEON_SMLSL: smlsl(vf_l, rd, rn, rm); break; + case NEON_SMLSL2: smlsl2(vf_l, rd, rn, rm); break; + case NEON_UMLSL: umlsl(vf_l, rd, rn, rm); break; + case NEON_UMLSL2: umlsl2(vf_l, rd, rn, rm); break; + case NEON_SMULL: smull(vf_l, rd, rn, rm); break; + case NEON_SMULL2: smull2(vf_l, rd, rn, rm); break; + case NEON_UMULL: umull(vf_l, rd, rn, rm); break; + case NEON_UMULL2: umull2(vf_l, rd, rn, rm); break; + case NEON_SQDMLAL: sqdmlal(vf_l, rd, rn, rm); break; + case NEON_SQDMLAL2: sqdmlal2(vf_l, rd, rn, rm); break; + case NEON_SQDMLSL: sqdmlsl(vf_l, rd, rn, rm); break; + case NEON_SQDMLSL2: sqdmlsl2(vf_l, rd, rn, rm); break; + case NEON_SQDMULL: sqdmull(vf_l, rd, rn, rm); break; + case NEON_SQDMULL2: sqdmull2(vf_l, rd, rn, rm); break; + case NEON_UADDW: uaddw(vf_l, rd, rn, rm); break; + case NEON_UADDW2: uaddw2(vf_l, rd, rn, rm); break; + case NEON_SADDW: saddw(vf_l, rd, rn, rm); break; + case NEON_SADDW2: saddw2(vf_l, rd, rn, rm); break; + case NEON_USUBW: usubw(vf_l, rd, rn, rm); break; + case NEON_USUBW2: usubw2(vf_l, rd, rn, rm); break; + case NEON_SSUBW: ssubw(vf_l, rd, rn, rm); break; + case NEON_SSUBW2: ssubw2(vf_l, rd, rn, rm); break; + case NEON_ADDHN: addhn(vf, rd, rn, rm); break; + case NEON_ADDHN2: addhn2(vf, rd, rn, rm); break; + case NEON_RADDHN: raddhn(vf, rd, rn, rm); break; + case NEON_RADDHN2: raddhn2(vf, rd, rn, rm); break; + case NEON_SUBHN: subhn(vf, rd, rn, rm); break; + case NEON_SUBHN2: subhn2(vf, rd, rn, rm); break; + case NEON_RSUBHN: rsubhn(vf, rd, rn, rm); break; + case NEON_RSUBHN2: rsubhn2(vf, rd, rn, rm); break; + default: + VIXL_UNIMPLEMENTED(); + } +} + + +void Simulator::VisitNEONAcrossLanes(const Instruction* instr) { + NEONFormatDecoder nfd(instr); + + SimVRegister& rd = vreg(instr->Rd()); + SimVRegister& rn = vreg(instr->Rn()); + + // The input operand's VectorFormat is passed for these instructions. + if (instr->Mask(NEONAcrossLanesFPFMask) == NEONAcrossLanesFPFixed) { + VectorFormat vf = nfd.GetVectorFormat(nfd.FPFormatMap()); + + switch (instr->Mask(NEONAcrossLanesFPMask)) { + case NEON_FMAXV: fmaxv(vf, rd, rn); break; + case NEON_FMINV: fminv(vf, rd, rn); break; + case NEON_FMAXNMV: fmaxnmv(vf, rd, rn); break; + case NEON_FMINNMV: fminnmv(vf, rd, rn); break; + default: + VIXL_UNIMPLEMENTED(); + } + } else { + VectorFormat vf = nfd.GetVectorFormat(); + + switch (instr->Mask(NEONAcrossLanesMask)) { + case NEON_ADDV: addv(vf, rd, rn); break; + case NEON_SMAXV: smaxv(vf, rd, rn); break; + case NEON_SMINV: sminv(vf, rd, rn); break; + case NEON_UMAXV: umaxv(vf, rd, rn); break; + case NEON_UMINV: uminv(vf, rd, rn); break; + case NEON_SADDLV: saddlv(vf, rd, rn); break; + case NEON_UADDLV: uaddlv(vf, rd, rn); break; + default: + VIXL_UNIMPLEMENTED(); + } + } +} + + +void Simulator::VisitNEONByIndexedElement(const Instruction* instr) { + NEONFormatDecoder nfd(instr); + VectorFormat vf_r = nfd.GetVectorFormat(); + VectorFormat vf = nfd.GetVectorFormat(nfd.LongIntegerFormatMap()); + + SimVRegister& rd = vreg(instr->Rd()); + SimVRegister& rn = vreg(instr->Rn()); + + ByElementOp Op = NULL; + + int rm_reg = instr->Rm(); + int index = (instr->NEONH() << 1) | instr->NEONL(); + if (instr->NEONSize() == 1) { + rm_reg &= 0xf; + index = (index << 1) | instr->NEONM(); + } + + switch (instr->Mask(NEONByIndexedElementMask)) { + case NEON_MUL_byelement: Op = &Simulator::mul; vf = vf_r; break; + case NEON_MLA_byelement: Op = &Simulator::mla; vf = vf_r; break; + case NEON_MLS_byelement: Op = &Simulator::mls; vf = vf_r; break; + case NEON_SQDMULH_byelement: Op = &Simulator::sqdmulh; vf = vf_r; break; + case NEON_SQRDMULH_byelement: Op = &Simulator::sqrdmulh; vf = vf_r; break; + case NEON_SMULL_byelement: + if (instr->Mask(NEON_Q)) { + Op = &Simulator::smull2; + } else { + Op = &Simulator::smull; + } + break; + case NEON_UMULL_byelement: + if (instr->Mask(NEON_Q)) { + Op = &Simulator::umull2; + } else { + Op = &Simulator::umull; + } + break; + case NEON_SMLAL_byelement: + if (instr->Mask(NEON_Q)) { + Op = &Simulator::smlal2; + } else { + Op = &Simulator::smlal; + } + break; + case NEON_UMLAL_byelement: + if (instr->Mask(NEON_Q)) { + Op = &Simulator::umlal2; + } else { + Op = &Simulator::umlal; + } + break; + case NEON_SMLSL_byelement: + if (instr->Mask(NEON_Q)) { + Op = &Simulator::smlsl2; + } else { + Op = &Simulator::smlsl; + } + break; + case NEON_UMLSL_byelement: + if (instr->Mask(NEON_Q)) { + Op = &Simulator::umlsl2; + } else { + Op = &Simulator::umlsl; + } + break; + case NEON_SQDMULL_byelement: + if (instr->Mask(NEON_Q)) { + Op = &Simulator::sqdmull2; + } else { + Op = &Simulator::sqdmull; + } + break; + case NEON_SQDMLAL_byelement: + if (instr->Mask(NEON_Q)) { + Op = &Simulator::sqdmlal2; + } else { + Op = &Simulator::sqdmlal; + } + break; + case NEON_SQDMLSL_byelement: + if (instr->Mask(NEON_Q)) { + Op = &Simulator::sqdmlsl2; + } else { + Op = &Simulator::sqdmlsl; + } + break; + default: + index = instr->NEONH(); + if ((instr->FPType() & 1) == 0) { + index = (index << 1) | instr->NEONL(); + } + + vf = nfd.GetVectorFormat(nfd.FPFormatMap()); + + switch (instr->Mask(NEONByIndexedElementFPMask)) { + case NEON_FMUL_byelement: Op = &Simulator::fmul; break; + case NEON_FMLA_byelement: Op = &Simulator::fmla; break; + case NEON_FMLS_byelement: Op = &Simulator::fmls; break; + case NEON_FMULX_byelement: Op = &Simulator::fmulx; break; + default: VIXL_UNIMPLEMENTED(); + } + } + + (this->*Op)(vf, rd, rn, vreg(rm_reg), index); +} + + +void Simulator::VisitNEONCopy(const Instruction* instr) { + NEONFormatDecoder nfd(instr, NEONFormatDecoder::TriangularFormatMap()); + VectorFormat vf = nfd.GetVectorFormat(); + + SimVRegister& rd = vreg(instr->Rd()); + SimVRegister& rn = vreg(instr->Rn()); + int imm5 = instr->ImmNEON5(); + int tz = CountTrailingZeros(imm5, 32); + int reg_index = imm5 >> (tz + 1); + + if (instr->Mask(NEONCopyInsElementMask) == NEON_INS_ELEMENT) { + int imm4 = instr->ImmNEON4(); + int rn_index = imm4 >> tz; + ins_element(vf, rd, reg_index, rn, rn_index); + } else if (instr->Mask(NEONCopyInsGeneralMask) == NEON_INS_GENERAL) { + ins_immediate(vf, rd, reg_index, xreg(instr->Rn())); + } else if (instr->Mask(NEONCopyUmovMask) == NEON_UMOV) { + uint64_t value = LogicVRegister(rn).Uint(vf, reg_index); + value &= MaxUintFromFormat(vf); + set_xreg(instr->Rd(), value); + } else if (instr->Mask(NEONCopyUmovMask) == NEON_SMOV) { + int64_t value = LogicVRegister(rn).Int(vf, reg_index); + if (instr->NEONQ()) { + set_xreg(instr->Rd(), value); + } else { + set_wreg(instr->Rd(), (int32_t)value); + } + } else if (instr->Mask(NEONCopyDupElementMask) == NEON_DUP_ELEMENT) { + dup_element(vf, rd, rn, reg_index); + } else if (instr->Mask(NEONCopyDupGeneralMask) == NEON_DUP_GENERAL) { + dup_immediate(vf, rd, xreg(instr->Rn())); + } else { + VIXL_UNIMPLEMENTED(); + } +} + + +void Simulator::VisitNEONExtract(const Instruction* instr) { + NEONFormatDecoder nfd(instr, NEONFormatDecoder::LogicalFormatMap()); + VectorFormat vf = nfd.GetVectorFormat(); + SimVRegister& rd = vreg(instr->Rd()); + SimVRegister& rn = vreg(instr->Rn()); + SimVRegister& rm = vreg(instr->Rm()); + if (instr->Mask(NEONExtractMask) == NEON_EXT) { + int index = instr->ImmNEONExt(); + ext(vf, rd, rn, rm, index); + } else { + VIXL_UNIMPLEMENTED(); + } +} + + +void Simulator::NEONLoadStoreMultiStructHelper(const Instruction* instr, + AddrMode addr_mode) { + NEONFormatDecoder nfd(instr, NEONFormatDecoder::LoadStoreFormatMap()); + VectorFormat vf = nfd.GetVectorFormat(); + + uint64_t addr_base = xreg(instr->Rn(), Reg31IsStackPointer); + int reg_size = RegisterSizeInBytesFromFormat(vf); + + int reg[4]; + uint64_t addr[4]; + for (int i = 0; i < 4; i++) { + reg[i] = (instr->Rt() + i) % kNumberOfVRegisters; + addr[i] = addr_base + (i * reg_size); + } + int count = 1; + bool log_read = true; + + Instr itype = instr->Mask(NEONLoadStoreMultiStructMask); + if (((itype == NEON_LD1_1v) || (itype == NEON_LD1_2v) || + (itype == NEON_LD1_3v) || (itype == NEON_LD1_4v) || + (itype == NEON_ST1_1v) || (itype == NEON_ST1_2v) || + (itype == NEON_ST1_3v) || (itype == NEON_ST1_4v)) && + (instr->Bits(20, 16) != 0)) { + VIXL_UNREACHABLE(); + } + + // We use the PostIndex mask here, as it works in this case for both Offset + // and PostIndex addressing. + switch (instr->Mask(NEONLoadStoreMultiStructPostIndexMask)) { + case NEON_LD1_4v: + case NEON_LD1_4v_post: ld1(vf, vreg(reg[3]), addr[3]); count++; + VIXL_FALLTHROUGH(); + case NEON_LD1_3v: + case NEON_LD1_3v_post: ld1(vf, vreg(reg[2]), addr[2]); count++; + VIXL_FALLTHROUGH(); + case NEON_LD1_2v: + case NEON_LD1_2v_post: ld1(vf, vreg(reg[1]), addr[1]); count++; + VIXL_FALLTHROUGH(); + case NEON_LD1_1v: + case NEON_LD1_1v_post: + ld1(vf, vreg(reg[0]), addr[0]); + log_read = true; + break; + case NEON_ST1_4v: + case NEON_ST1_4v_post: st1(vf, vreg(reg[3]), addr[3]); count++; + VIXL_FALLTHROUGH(); + case NEON_ST1_3v: + case NEON_ST1_3v_post: st1(vf, vreg(reg[2]), addr[2]); count++; + VIXL_FALLTHROUGH(); + case NEON_ST1_2v: + case NEON_ST1_2v_post: st1(vf, vreg(reg[1]), addr[1]); count++; + VIXL_FALLTHROUGH(); + case NEON_ST1_1v: + case NEON_ST1_1v_post: + st1(vf, vreg(reg[0]), addr[0]); + log_read = false; + break; + case NEON_LD2_post: + case NEON_LD2: + ld2(vf, vreg(reg[0]), vreg(reg[1]), addr[0]); + count = 2; + break; + case NEON_ST2: + case NEON_ST2_post: + st2(vf, vreg(reg[0]), vreg(reg[1]), addr[0]); + count = 2; + break; + case NEON_LD3_post: + case NEON_LD3: + ld3(vf, vreg(reg[0]), vreg(reg[1]), vreg(reg[2]), addr[0]); + count = 3; + break; + case NEON_ST3: + case NEON_ST3_post: + st3(vf, vreg(reg[0]), vreg(reg[1]), vreg(reg[2]), addr[0]); + count = 3; + break; + case NEON_ST4: + case NEON_ST4_post: + st4(vf, vreg(reg[0]), vreg(reg[1]), vreg(reg[2]), vreg(reg[3]), + addr[0]); + count = 4; + break; + case NEON_LD4_post: + case NEON_LD4: + ld4(vf, vreg(reg[0]), vreg(reg[1]), vreg(reg[2]), vreg(reg[3]), + addr[0]); + count = 4; + break; + default: VIXL_UNIMPLEMENTED(); + } + + // Explicitly log the register update whilst we have type information. + for (int i = 0; i < count; i++) { + // For de-interleaving loads, only print the base address. + int lane_size = LaneSizeInBytesFromFormat(vf); + PrintRegisterFormat format = GetPrintRegisterFormatTryFP( + GetPrintRegisterFormatForSize(reg_size, lane_size)); + if (log_read) { + LogVRead(addr_base, reg[i], format); + } else { + LogVWrite(addr_base, reg[i], format); + } + } + + if (addr_mode == PostIndex) { + int rm = instr->Rm(); + // The immediate post index addressing mode is indicated by rm = 31. + // The immediate is implied by the number of vector registers used. + addr_base += (rm == 31) ? RegisterSizeInBytesFromFormat(vf) * count + : xreg(rm); + set_xreg(instr->Rn(), addr_base); + } else { + VIXL_ASSERT(addr_mode == Offset); + } +} + + +void Simulator::VisitNEONLoadStoreMultiStruct(const Instruction* instr) { + NEONLoadStoreMultiStructHelper(instr, Offset); +} + + +void Simulator::VisitNEONLoadStoreMultiStructPostIndex( + const Instruction* instr) { + NEONLoadStoreMultiStructHelper(instr, PostIndex); +} + + +void Simulator::NEONLoadStoreSingleStructHelper(const Instruction* instr, + AddrMode addr_mode) { + uint64_t addr = xreg(instr->Rn(), Reg31IsStackPointer); + int rt = instr->Rt(); + + Instr itype = instr->Mask(NEONLoadStoreSingleStructMask); + if (((itype == NEON_LD1_b) || (itype == NEON_LD1_h) || + (itype == NEON_LD1_s) || (itype == NEON_LD1_d)) && + (instr->Bits(20, 16) != 0)) { + VIXL_UNREACHABLE(); + } + + // We use the PostIndex mask here, as it works in this case for both Offset + // and PostIndex addressing. + bool do_load = false; + + bool replicating = false; + + NEONFormatDecoder nfd(instr, NEONFormatDecoder::LoadStoreFormatMap()); + VectorFormat vf_t = nfd.GetVectorFormat(); + + VectorFormat vf = kFormat16B; + switch (instr->Mask(NEONLoadStoreSingleStructPostIndexMask)) { + case NEON_LD1_b: + case NEON_LD1_b_post: + case NEON_LD2_b: + case NEON_LD2_b_post: + case NEON_LD3_b: + case NEON_LD3_b_post: + case NEON_LD4_b: + case NEON_LD4_b_post: do_load = true; + VIXL_FALLTHROUGH(); + case NEON_ST1_b: + case NEON_ST1_b_post: + case NEON_ST2_b: + case NEON_ST2_b_post: + case NEON_ST3_b: + case NEON_ST3_b_post: + case NEON_ST4_b: + case NEON_ST4_b_post: break; + + case NEON_LD1_h: + case NEON_LD1_h_post: + case NEON_LD2_h: + case NEON_LD2_h_post: + case NEON_LD3_h: + case NEON_LD3_h_post: + case NEON_LD4_h: + case NEON_LD4_h_post: do_load = true; + VIXL_FALLTHROUGH(); + case NEON_ST1_h: + case NEON_ST1_h_post: + case NEON_ST2_h: + case NEON_ST2_h_post: + case NEON_ST3_h: + case NEON_ST3_h_post: + case NEON_ST4_h: + case NEON_ST4_h_post: vf = kFormat8H; break; + case NEON_LD1_s: + case NEON_LD1_s_post: + case NEON_LD2_s: + case NEON_LD2_s_post: + case NEON_LD3_s: + case NEON_LD3_s_post: + case NEON_LD4_s: + case NEON_LD4_s_post: do_load = true; + VIXL_FALLTHROUGH(); + case NEON_ST1_s: + case NEON_ST1_s_post: + case NEON_ST2_s: + case NEON_ST2_s_post: + case NEON_ST3_s: + case NEON_ST3_s_post: + case NEON_ST4_s: + case NEON_ST4_s_post: { + VIXL_STATIC_ASSERT((NEON_LD1_s | (1 << NEONLSSize_offset)) == NEON_LD1_d); + VIXL_STATIC_ASSERT( + (NEON_LD1_s_post | (1 << NEONLSSize_offset)) == NEON_LD1_d_post); + VIXL_STATIC_ASSERT((NEON_ST1_s | (1 << NEONLSSize_offset)) == NEON_ST1_d); + VIXL_STATIC_ASSERT( + (NEON_ST1_s_post | (1 << NEONLSSize_offset)) == NEON_ST1_d_post); + vf = ((instr->NEONLSSize() & 1) == 0) ? kFormat4S : kFormat2D; + break; + } + + case NEON_LD1R: + case NEON_LD1R_post: + case NEON_LD2R: + case NEON_LD2R_post: + case NEON_LD3R: + case NEON_LD3R_post: + case NEON_LD4R: + case NEON_LD4R_post: { + vf = vf_t; + do_load = true; + replicating = true; + break; + } + default: VIXL_UNIMPLEMENTED(); + } + + PrintRegisterFormat print_format = + GetPrintRegisterFormatTryFP(GetPrintRegisterFormat(vf)); + // Make sure that the print_format only includes a single lane. + print_format = + static_cast<PrintRegisterFormat>(print_format & ~kPrintRegAsVectorMask); + + int esize = LaneSizeInBytesFromFormat(vf); + int index_shift = LaneSizeInBytesLog2FromFormat(vf); + int lane = instr->NEONLSIndex(index_shift); + int scale = 0; + int rt2 = (rt + 1) % kNumberOfVRegisters; + int rt3 = (rt2 + 1) % kNumberOfVRegisters; + int rt4 = (rt3 + 1) % kNumberOfVRegisters; + switch (instr->Mask(NEONLoadStoreSingleLenMask)) { + case NEONLoadStoreSingle1: + scale = 1; + if (do_load) { + if (replicating) { + ld1r(vf, vreg(rt), addr); + } else { + ld1(vf, vreg(rt), lane, addr); + } + LogVRead(addr, rt, print_format, lane); + } else { + st1(vf, vreg(rt), lane, addr); + LogVWrite(addr, rt, print_format, lane); + } + break; + case NEONLoadStoreSingle2: + scale = 2; + if (do_load) { + if (replicating) { + ld2r(vf, vreg(rt), vreg(rt2), addr); + } else { + ld2(vf, vreg(rt), vreg(rt2), lane, addr); + } + LogVRead(addr, rt, print_format, lane); + LogVRead(addr + esize, rt2, print_format, lane); + } else { + st2(vf, vreg(rt), vreg(rt2), lane, addr); + LogVWrite(addr, rt, print_format, lane); + LogVWrite(addr + esize, rt2, print_format, lane); + } + break; + case NEONLoadStoreSingle3: + scale = 3; + if (do_load) { + if (replicating) { + ld3r(vf, vreg(rt), vreg(rt2), vreg(rt3), addr); + } else { + ld3(vf, vreg(rt), vreg(rt2), vreg(rt3), lane, addr); + } + LogVRead(addr, rt, print_format, lane); + LogVRead(addr + esize, rt2, print_format, lane); + LogVRead(addr + (2 * esize), rt3, print_format, lane); + } else { + st3(vf, vreg(rt), vreg(rt2), vreg(rt3), lane, addr); + LogVWrite(addr, rt, print_format, lane); + LogVWrite(addr + esize, rt2, print_format, lane); + LogVWrite(addr + (2 * esize), rt3, print_format, lane); + } + break; + case NEONLoadStoreSingle4: + scale = 4; + if (do_load) { + if (replicating) { + ld4r(vf, vreg(rt), vreg(rt2), vreg(rt3), vreg(rt4), addr); + } else { + ld4(vf, vreg(rt), vreg(rt2), vreg(rt3), vreg(rt4), lane, addr); + } + LogVRead(addr, rt, print_format, lane); + LogVRead(addr + esize, rt2, print_format, lane); + LogVRead(addr + (2 * esize), rt3, print_format, lane); + LogVRead(addr + (3 * esize), rt4, print_format, lane); + } else { + st4(vf, vreg(rt), vreg(rt2), vreg(rt3), vreg(rt4), lane, addr); + LogVWrite(addr, rt, print_format, lane); + LogVWrite(addr + esize, rt2, print_format, lane); + LogVWrite(addr + (2 * esize), rt3, print_format, lane); + LogVWrite(addr + (3 * esize), rt4, print_format, lane); + } + break; + default: VIXL_UNIMPLEMENTED(); + } + + if (addr_mode == PostIndex) { + int rm = instr->Rm(); + int lane_size = LaneSizeInBytesFromFormat(vf); + set_xreg(instr->Rn(), addr + ((rm == 31) ? (scale * lane_size) : xreg(rm))); + } +} + + +void Simulator::VisitNEONLoadStoreSingleStruct(const Instruction* instr) { + NEONLoadStoreSingleStructHelper(instr, Offset); +} + + +void Simulator::VisitNEONLoadStoreSingleStructPostIndex( + const Instruction* instr) { + NEONLoadStoreSingleStructHelper(instr, PostIndex); +} + + +void Simulator::VisitNEONModifiedImmediate(const Instruction* instr) { + SimVRegister& rd = vreg(instr->Rd()); + int cmode = instr->NEONCmode(); + int cmode_3_1 = (cmode >> 1) & 7; + int cmode_3 = (cmode >> 3) & 1; + int cmode_2 = (cmode >> 2) & 1; + int cmode_1 = (cmode >> 1) & 1; + int cmode_0 = cmode & 1; + int q = instr->NEONQ(); + int op_bit = instr->NEONModImmOp(); + uint64_t imm8 = instr->ImmNEONabcdefgh(); + + // Find the format and immediate value + uint64_t imm = 0; + VectorFormat vform = kFormatUndefined; + switch (cmode_3_1) { + case 0x0: + case 0x1: + case 0x2: + case 0x3: + vform = (q == 1) ? kFormat4S : kFormat2S; + imm = imm8 << (8 * cmode_3_1); + break; + case 0x4: + case 0x5: + vform = (q == 1) ? kFormat8H : kFormat4H; + imm = imm8 << (8 * cmode_1); + break; + case 0x6: + vform = (q == 1) ? kFormat4S : kFormat2S; + if (cmode_0 == 0) { + imm = imm8 << 8 | 0x000000ff; + } else { + imm = imm8 << 16 | 0x0000ffff; + } + break; + case 0x7: + if (cmode_0 == 0 && op_bit == 0) { + vform = q ? kFormat16B : kFormat8B; + imm = imm8; + } else if (cmode_0 == 0 && op_bit == 1) { + vform = q ? kFormat2D : kFormat1D; + imm = 0; + for (int i = 0; i < 8; ++i) { + if (imm8 & (1ULL << i)) { + imm |= (UINT64_C(0xff) << (8 * i)); + } + } + } else { // cmode_0 == 1, cmode == 0xf. + if (op_bit == 0) { + vform = q ? kFormat4S : kFormat2S; + imm = FloatToRawbits(instr->ImmNEONFP32()); + } else if (q == 1) { + vform = kFormat2D; + imm = DoubleToRawbits(instr->ImmNEONFP64()); + } else { + VIXL_ASSERT((q == 0) && (op_bit == 1) && (cmode == 0xf)); + VisitUnallocated(instr); + } + } + break; + default: VIXL_UNREACHABLE(); break; + } + + // Find the operation + NEONModifiedImmediateOp op; + if (cmode_3 == 0) { + if (cmode_0 == 0) { + op = op_bit ? NEONModifiedImmediate_MVNI : NEONModifiedImmediate_MOVI; + } else { // cmode<0> == '1' + op = op_bit ? NEONModifiedImmediate_BIC : NEONModifiedImmediate_ORR; + } + } else { // cmode<3> == '1' + if (cmode_2 == 0) { + if (cmode_0 == 0) { + op = op_bit ? NEONModifiedImmediate_MVNI : NEONModifiedImmediate_MOVI; + } else { // cmode<0> == '1' + op = op_bit ? NEONModifiedImmediate_BIC : NEONModifiedImmediate_ORR; + } + } else { // cmode<2> == '1' + if (cmode_1 == 0) { + op = op_bit ? NEONModifiedImmediate_MVNI : NEONModifiedImmediate_MOVI; + } else { // cmode<1> == '1' + if (cmode_0 == 0) { + op = NEONModifiedImmediate_MOVI; + } else { // cmode<0> == '1' + op = NEONModifiedImmediate_MOVI; + } + } + } + } + + // Call the logic function + if (op == NEONModifiedImmediate_ORR) { + orr(vform, rd, rd, imm); + } else if (op == NEONModifiedImmediate_BIC) { + bic(vform, rd, rd, imm); + } else if (op == NEONModifiedImmediate_MOVI) { + movi(vform, rd, imm); + } else if (op == NEONModifiedImmediate_MVNI) { + mvni(vform, rd, imm); + } else { + VisitUnimplemented(instr); + } +} + + +void Simulator::VisitNEONScalar2RegMisc(const Instruction* instr) { + NEONFormatDecoder nfd(instr, NEONFormatDecoder::ScalarFormatMap()); + VectorFormat vf = nfd.GetVectorFormat(); + + SimVRegister& rd = vreg(instr->Rd()); + SimVRegister& rn = vreg(instr->Rn()); + + if (instr->Mask(NEON2RegMiscOpcode) <= NEON_NEG_scalar_opcode) { + // These instructions all use a two bit size field, except NOT and RBIT, + // which use the field to encode the operation. + switch (instr->Mask(NEONScalar2RegMiscMask)) { + case NEON_CMEQ_zero_scalar: cmp(vf, rd, rn, 0, eq); break; + case NEON_CMGE_zero_scalar: cmp(vf, rd, rn, 0, ge); break; + case NEON_CMGT_zero_scalar: cmp(vf, rd, rn, 0, gt); break; + case NEON_CMLT_zero_scalar: cmp(vf, rd, rn, 0, lt); break; + case NEON_CMLE_zero_scalar: cmp(vf, rd, rn, 0, le); break; + case NEON_ABS_scalar: abs(vf, rd, rn); break; + case NEON_SQABS_scalar: abs(vf, rd, rn).SignedSaturate(vf); break; + case NEON_NEG_scalar: neg(vf, rd, rn); break; + case NEON_SQNEG_scalar: neg(vf, rd, rn).SignedSaturate(vf); break; + case NEON_SUQADD_scalar: suqadd(vf, rd, rn); break; + case NEON_USQADD_scalar: usqadd(vf, rd, rn); break; + default: VIXL_UNIMPLEMENTED(); break; + } + } else { + VectorFormat fpf = nfd.GetVectorFormat(nfd.FPScalarFormatMap()); + FPRounding fpcr_rounding = static_cast<FPRounding>(fpcr().RMode()); + + // These instructions all use a one bit size field, except SQXTUN, SQXTN + // and UQXTN, which use a two bit size field. + switch (instr->Mask(NEONScalar2RegMiscFPMask)) { + case NEON_FRECPE_scalar: frecpe(fpf, rd, rn, fpcr_rounding); break; + case NEON_FRECPX_scalar: frecpx(fpf, rd, rn); break; + case NEON_FRSQRTE_scalar: frsqrte(fpf, rd, rn); break; + case NEON_FCMGT_zero_scalar: fcmp_zero(fpf, rd, rn, gt); break; + case NEON_FCMGE_zero_scalar: fcmp_zero(fpf, rd, rn, ge); break; + case NEON_FCMEQ_zero_scalar: fcmp_zero(fpf, rd, rn, eq); break; + case NEON_FCMLE_zero_scalar: fcmp_zero(fpf, rd, rn, le); break; + case NEON_FCMLT_zero_scalar: fcmp_zero(fpf, rd, rn, lt); break; + case NEON_SCVTF_scalar: scvtf(fpf, rd, rn, 0, fpcr_rounding); break; + case NEON_UCVTF_scalar: ucvtf(fpf, rd, rn, 0, fpcr_rounding); break; + case NEON_FCVTNS_scalar: fcvts(fpf, rd, rn, FPTieEven); break; + case NEON_FCVTNU_scalar: fcvtu(fpf, rd, rn, FPTieEven); break; + case NEON_FCVTPS_scalar: fcvts(fpf, rd, rn, FPPositiveInfinity); break; + case NEON_FCVTPU_scalar: fcvtu(fpf, rd, rn, FPPositiveInfinity); break; + case NEON_FCVTMS_scalar: fcvts(fpf, rd, rn, FPNegativeInfinity); break; + case NEON_FCVTMU_scalar: fcvtu(fpf, rd, rn, FPNegativeInfinity); break; + case NEON_FCVTZS_scalar: fcvts(fpf, rd, rn, FPZero); break; + case NEON_FCVTZU_scalar: fcvtu(fpf, rd, rn, FPZero); break; + case NEON_FCVTAS_scalar: fcvts(fpf, rd, rn, FPTieAway); break; + case NEON_FCVTAU_scalar: fcvtu(fpf, rd, rn, FPTieAway); break; + case NEON_FCVTXN_scalar: + // Unlike all of the other FP instructions above, fcvtxn encodes dest + // size S as size<0>=1. There's only one case, so we ignore the form. + VIXL_ASSERT(instr->Bit(22) == 1); + fcvtxn(kFormatS, rd, rn); + break; + default: + switch (instr->Mask(NEONScalar2RegMiscMask)) { + case NEON_SQXTN_scalar: sqxtn(vf, rd, rn); break; + case NEON_UQXTN_scalar: uqxtn(vf, rd, rn); break; + case NEON_SQXTUN_scalar: sqxtun(vf, rd, rn); break; + default: + VIXL_UNIMPLEMENTED(); + } + } + } +} + + +void Simulator::VisitNEONScalar3Diff(const Instruction* instr) { + NEONFormatDecoder nfd(instr, NEONFormatDecoder::LongScalarFormatMap()); + VectorFormat vf = nfd.GetVectorFormat(); + + SimVRegister& rd = vreg(instr->Rd()); + SimVRegister& rn = vreg(instr->Rn()); + SimVRegister& rm = vreg(instr->Rm()); + switch (instr->Mask(NEONScalar3DiffMask)) { + case NEON_SQDMLAL_scalar: sqdmlal(vf, rd, rn, rm); break; + case NEON_SQDMLSL_scalar: sqdmlsl(vf, rd, rn, rm); break; + case NEON_SQDMULL_scalar: sqdmull(vf, rd, rn, rm); break; + default: + VIXL_UNIMPLEMENTED(); + } +} + + +void Simulator::VisitNEONScalar3Same(const Instruction* instr) { + NEONFormatDecoder nfd(instr, NEONFormatDecoder::ScalarFormatMap()); + VectorFormat vf = nfd.GetVectorFormat(); + + SimVRegister& rd = vreg(instr->Rd()); + SimVRegister& rn = vreg(instr->Rn()); + SimVRegister& rm = vreg(instr->Rm()); + + if (instr->Mask(NEONScalar3SameFPFMask) == NEONScalar3SameFPFixed) { + vf = nfd.GetVectorFormat(nfd.FPScalarFormatMap()); + switch (instr->Mask(NEONScalar3SameFPMask)) { + case NEON_FMULX_scalar: fmulx(vf, rd, rn, rm); break; + case NEON_FACGE_scalar: fabscmp(vf, rd, rn, rm, ge); break; + case NEON_FACGT_scalar: fabscmp(vf, rd, rn, rm, gt); break; + case NEON_FCMEQ_scalar: fcmp(vf, rd, rn, rm, eq); break; + case NEON_FCMGE_scalar: fcmp(vf, rd, rn, rm, ge); break; + case NEON_FCMGT_scalar: fcmp(vf, rd, rn, rm, gt); break; + case NEON_FRECPS_scalar: frecps(vf, rd, rn, rm); break; + case NEON_FRSQRTS_scalar: frsqrts(vf, rd, rn, rm); break; + case NEON_FABD_scalar: fabd(vf, rd, rn, rm); break; + default: + VIXL_UNIMPLEMENTED(); + } + } else { + switch (instr->Mask(NEONScalar3SameMask)) { + case NEON_ADD_scalar: add(vf, rd, rn, rm); break; + case NEON_SUB_scalar: sub(vf, rd, rn, rm); break; + case NEON_CMEQ_scalar: cmp(vf, rd, rn, rm, eq); break; + case NEON_CMGE_scalar: cmp(vf, rd, rn, rm, ge); break; + case NEON_CMGT_scalar: cmp(vf, rd, rn, rm, gt); break; + case NEON_CMHI_scalar: cmp(vf, rd, rn, rm, hi); break; + case NEON_CMHS_scalar: cmp(vf, rd, rn, rm, hs); break; + case NEON_CMTST_scalar: cmptst(vf, rd, rn, rm); break; + case NEON_USHL_scalar: ushl(vf, rd, rn, rm); break; + case NEON_SSHL_scalar: sshl(vf, rd, rn, rm); break; + case NEON_SQDMULH_scalar: sqdmulh(vf, rd, rn, rm); break; + case NEON_SQRDMULH_scalar: sqrdmulh(vf, rd, rn, rm); break; + case NEON_UQADD_scalar: + add(vf, rd, rn, rm).UnsignedSaturate(vf); + break; + case NEON_SQADD_scalar: + add(vf, rd, rn, rm).SignedSaturate(vf); + break; + case NEON_UQSUB_scalar: + sub(vf, rd, rn, rm).UnsignedSaturate(vf); + break; + case NEON_SQSUB_scalar: + sub(vf, rd, rn, rm).SignedSaturate(vf); + break; + case NEON_UQSHL_scalar: + ushl(vf, rd, rn, rm).UnsignedSaturate(vf); + break; + case NEON_SQSHL_scalar: + sshl(vf, rd, rn, rm).SignedSaturate(vf); + break; + case NEON_URSHL_scalar: + ushl(vf, rd, rn, rm).Round(vf); + break; + case NEON_SRSHL_scalar: + sshl(vf, rd, rn, rm).Round(vf); + break; + case NEON_UQRSHL_scalar: + ushl(vf, rd, rn, rm).Round(vf).UnsignedSaturate(vf); + break; + case NEON_SQRSHL_scalar: + sshl(vf, rd, rn, rm).Round(vf).SignedSaturate(vf); + break; + default: + VIXL_UNIMPLEMENTED(); + } + } +} + + +void Simulator::VisitNEONScalarByIndexedElement(const Instruction* instr) { + NEONFormatDecoder nfd(instr, NEONFormatDecoder::LongScalarFormatMap()); + VectorFormat vf = nfd.GetVectorFormat(); + VectorFormat vf_r = nfd.GetVectorFormat(nfd.ScalarFormatMap()); + + SimVRegister& rd = vreg(instr->Rd()); + SimVRegister& rn = vreg(instr->Rn()); + ByElementOp Op = NULL; + + int rm_reg = instr->Rm(); + int index = (instr->NEONH() << 1) | instr->NEONL(); + if (instr->NEONSize() == 1) { + rm_reg &= 0xf; + index = (index << 1) | instr->NEONM(); + } + + switch (instr->Mask(NEONScalarByIndexedElementMask)) { + case NEON_SQDMULL_byelement_scalar: Op = &Simulator::sqdmull; break; + case NEON_SQDMLAL_byelement_scalar: Op = &Simulator::sqdmlal; break; + case NEON_SQDMLSL_byelement_scalar: Op = &Simulator::sqdmlsl; break; + case NEON_SQDMULH_byelement_scalar: + Op = &Simulator::sqdmulh; + vf = vf_r; + break; + case NEON_SQRDMULH_byelement_scalar: + Op = &Simulator::sqrdmulh; + vf = vf_r; + break; + default: + vf = nfd.GetVectorFormat(nfd.FPScalarFormatMap()); + index = instr->NEONH(); + if ((instr->FPType() & 1) == 0) { + index = (index << 1) | instr->NEONL(); + } + switch (instr->Mask(NEONScalarByIndexedElementFPMask)) { + case NEON_FMUL_byelement_scalar: Op = &Simulator::fmul; break; + case NEON_FMLA_byelement_scalar: Op = &Simulator::fmla; break; + case NEON_FMLS_byelement_scalar: Op = &Simulator::fmls; break; + case NEON_FMULX_byelement_scalar: Op = &Simulator::fmulx; break; + default: VIXL_UNIMPLEMENTED(); + } + } + + (this->*Op)(vf, rd, rn, vreg(rm_reg), index); +} + + +void Simulator::VisitNEONScalarCopy(const Instruction* instr) { + NEONFormatDecoder nfd(instr, NEONFormatDecoder::TriangularScalarFormatMap()); + VectorFormat vf = nfd.GetVectorFormat(); + + SimVRegister& rd = vreg(instr->Rd()); + SimVRegister& rn = vreg(instr->Rn()); + + if (instr->Mask(NEONScalarCopyMask) == NEON_DUP_ELEMENT_scalar) { + int imm5 = instr->ImmNEON5(); + int tz = CountTrailingZeros(imm5, 32); + int rn_index = imm5 >> (tz + 1); + dup_element(vf, rd, rn, rn_index); + } else { + VIXL_UNIMPLEMENTED(); + } +} + + +void Simulator::VisitNEONScalarPairwise(const Instruction* instr) { + NEONFormatDecoder nfd(instr, NEONFormatDecoder::FPScalarFormatMap()); + VectorFormat vf = nfd.GetVectorFormat(); + + SimVRegister& rd = vreg(instr->Rd()); + SimVRegister& rn = vreg(instr->Rn()); + switch (instr->Mask(NEONScalarPairwiseMask)) { + case NEON_ADDP_scalar: addp(vf, rd, rn); break; + case NEON_FADDP_scalar: faddp(vf, rd, rn); break; + case NEON_FMAXP_scalar: fmaxp(vf, rd, rn); break; + case NEON_FMAXNMP_scalar: fmaxnmp(vf, rd, rn); break; + case NEON_FMINP_scalar: fminp(vf, rd, rn); break; + case NEON_FMINNMP_scalar: fminnmp(vf, rd, rn); break; + default: + VIXL_UNIMPLEMENTED(); + } +} + + +void Simulator::VisitNEONScalarShiftImmediate(const Instruction* instr) { + SimVRegister& rd = vreg(instr->Rd()); + SimVRegister& rn = vreg(instr->Rn()); + FPRounding fpcr_rounding = static_cast<FPRounding>(fpcr().RMode()); + + static const NEONFormatMap map = { + {22, 21, 20, 19}, + {NF_UNDEF, NF_B, NF_H, NF_H, NF_S, NF_S, NF_S, NF_S, + NF_D, NF_D, NF_D, NF_D, NF_D, NF_D, NF_D, NF_D} + }; + NEONFormatDecoder nfd(instr, &map); + VectorFormat vf = nfd.GetVectorFormat(); + + int highestSetBit = HighestSetBitPosition(instr->ImmNEONImmh()); + int immhimmb = instr->ImmNEONImmhImmb(); + int right_shift = (16 << highestSetBit) - immhimmb; + int left_shift = immhimmb - (8 << highestSetBit); + switch (instr->Mask(NEONScalarShiftImmediateMask)) { + case NEON_SHL_scalar: shl(vf, rd, rn, left_shift); break; + case NEON_SLI_scalar: sli(vf, rd, rn, left_shift); break; + case NEON_SQSHL_imm_scalar: sqshl(vf, rd, rn, left_shift); break; + case NEON_UQSHL_imm_scalar: uqshl(vf, rd, rn, left_shift); break; + case NEON_SQSHLU_scalar: sqshlu(vf, rd, rn, left_shift); break; + case NEON_SRI_scalar: sri(vf, rd, rn, right_shift); break; + case NEON_SSHR_scalar: sshr(vf, rd, rn, right_shift); break; + case NEON_USHR_scalar: ushr(vf, rd, rn, right_shift); break; + case NEON_SRSHR_scalar: sshr(vf, rd, rn, right_shift).Round(vf); break; + case NEON_URSHR_scalar: ushr(vf, rd, rn, right_shift).Round(vf); break; + case NEON_SSRA_scalar: ssra(vf, rd, rn, right_shift); break; + case NEON_USRA_scalar: usra(vf, rd, rn, right_shift); break; + case NEON_SRSRA_scalar: srsra(vf, rd, rn, right_shift); break; + case NEON_URSRA_scalar: ursra(vf, rd, rn, right_shift); break; + case NEON_UQSHRN_scalar: uqshrn(vf, rd, rn, right_shift); break; + case NEON_UQRSHRN_scalar: uqrshrn(vf, rd, rn, right_shift); break; + case NEON_SQSHRN_scalar: sqshrn(vf, rd, rn, right_shift); break; + case NEON_SQRSHRN_scalar: sqrshrn(vf, rd, rn, right_shift); break; + case NEON_SQSHRUN_scalar: sqshrun(vf, rd, rn, right_shift); break; + case NEON_SQRSHRUN_scalar: sqrshrun(vf, rd, rn, right_shift); break; + case NEON_FCVTZS_imm_scalar: fcvts(vf, rd, rn, FPZero, right_shift); break; + case NEON_FCVTZU_imm_scalar: fcvtu(vf, rd, rn, FPZero, right_shift); break; + case NEON_SCVTF_imm_scalar: + scvtf(vf, rd, rn, right_shift, fpcr_rounding); + break; + case NEON_UCVTF_imm_scalar: + ucvtf(vf, rd, rn, right_shift, fpcr_rounding); + break; + default: + VIXL_UNIMPLEMENTED(); + } +} + + +void Simulator::VisitNEONShiftImmediate(const Instruction* instr) { + SimVRegister& rd = vreg(instr->Rd()); + SimVRegister& rn = vreg(instr->Rn()); + FPRounding fpcr_rounding = static_cast<FPRounding>(fpcr().RMode()); + + // 00010->8B, 00011->16B, 001x0->4H, 001x1->8H, + // 01xx0->2S, 01xx1->4S, 1xxx1->2D, all others undefined. + static const NEONFormatMap map = { + {22, 21, 20, 19, 30}, + {NF_UNDEF, NF_UNDEF, NF_8B, NF_16B, NF_4H, NF_8H, NF_4H, NF_8H, + NF_2S, NF_4S, NF_2S, NF_4S, NF_2S, NF_4S, NF_2S, NF_4S, + NF_UNDEF, NF_2D, NF_UNDEF, NF_2D, NF_UNDEF, NF_2D, NF_UNDEF, NF_2D, + NF_UNDEF, NF_2D, NF_UNDEF, NF_2D, NF_UNDEF, NF_2D, NF_UNDEF, NF_2D} + }; + NEONFormatDecoder nfd(instr, &map); + VectorFormat vf = nfd.GetVectorFormat(); + + // 0001->8H, 001x->4S, 01xx->2D, all others undefined. + static const NEONFormatMap map_l = { + {22, 21, 20, 19}, + {NF_UNDEF, NF_8H, NF_4S, NF_4S, NF_2D, NF_2D, NF_2D, NF_2D} + }; + VectorFormat vf_l = nfd.GetVectorFormat(&map_l); + + int highestSetBit = HighestSetBitPosition(instr->ImmNEONImmh()); + int immhimmb = instr->ImmNEONImmhImmb(); + int right_shift = (16 << highestSetBit) - immhimmb; + int left_shift = immhimmb - (8 << highestSetBit); + + switch (instr->Mask(NEONShiftImmediateMask)) { + case NEON_SHL: shl(vf, rd, rn, left_shift); break; + case NEON_SLI: sli(vf, rd, rn, left_shift); break; + case NEON_SQSHLU: sqshlu(vf, rd, rn, left_shift); break; + case NEON_SRI: sri(vf, rd, rn, right_shift); break; + case NEON_SSHR: sshr(vf, rd, rn, right_shift); break; + case NEON_USHR: ushr(vf, rd, rn, right_shift); break; + case NEON_SRSHR: sshr(vf, rd, rn, right_shift).Round(vf); break; + case NEON_URSHR: ushr(vf, rd, rn, right_shift).Round(vf); break; + case NEON_SSRA: ssra(vf, rd, rn, right_shift); break; + case NEON_USRA: usra(vf, rd, rn, right_shift); break; + case NEON_SRSRA: srsra(vf, rd, rn, right_shift); break; + case NEON_URSRA: ursra(vf, rd, rn, right_shift); break; + case NEON_SQSHL_imm: sqshl(vf, rd, rn, left_shift); break; + case NEON_UQSHL_imm: uqshl(vf, rd, rn, left_shift); break; + case NEON_SCVTF_imm: scvtf(vf, rd, rn, right_shift, fpcr_rounding); break; + case NEON_UCVTF_imm: ucvtf(vf, rd, rn, right_shift, fpcr_rounding); break; + case NEON_FCVTZS_imm: fcvts(vf, rd, rn, FPZero, right_shift); break; + case NEON_FCVTZU_imm: fcvtu(vf, rd, rn, FPZero, right_shift); break; + case NEON_SSHLL: + vf = vf_l; + if (instr->Mask(NEON_Q)) { + sshll2(vf, rd, rn, left_shift); + } else { + sshll(vf, rd, rn, left_shift); + } + break; + case NEON_USHLL: + vf = vf_l; + if (instr->Mask(NEON_Q)) { + ushll2(vf, rd, rn, left_shift); + } else { + ushll(vf, rd, rn, left_shift); + } + break; + case NEON_SHRN: + if (instr->Mask(NEON_Q)) { + shrn2(vf, rd, rn, right_shift); + } else { + shrn(vf, rd, rn, right_shift); + } + break; + case NEON_RSHRN: + if (instr->Mask(NEON_Q)) { + rshrn2(vf, rd, rn, right_shift); + } else { + rshrn(vf, rd, rn, right_shift); + } + break; + case NEON_UQSHRN: + if (instr->Mask(NEON_Q)) { + uqshrn2(vf, rd, rn, right_shift); + } else { + uqshrn(vf, rd, rn, right_shift); + } + break; + case NEON_UQRSHRN: + if (instr->Mask(NEON_Q)) { + uqrshrn2(vf, rd, rn, right_shift); + } else { + uqrshrn(vf, rd, rn, right_shift); + } + break; + case NEON_SQSHRN: + if (instr->Mask(NEON_Q)) { + sqshrn2(vf, rd, rn, right_shift); + } else { + sqshrn(vf, rd, rn, right_shift); + } + break; + case NEON_SQRSHRN: + if (instr->Mask(NEON_Q)) { + sqrshrn2(vf, rd, rn, right_shift); + } else { + sqrshrn(vf, rd, rn, right_shift); + } + break; + case NEON_SQSHRUN: + if (instr->Mask(NEON_Q)) { + sqshrun2(vf, rd, rn, right_shift); + } else { + sqshrun(vf, rd, rn, right_shift); + } + break; + case NEON_SQRSHRUN: + if (instr->Mask(NEON_Q)) { + sqrshrun2(vf, rd, rn, right_shift); + } else { + sqrshrun(vf, rd, rn, right_shift); + } + break; + default: + VIXL_UNIMPLEMENTED(); + } +} + + +void Simulator::VisitNEONTable(const Instruction* instr) { + NEONFormatDecoder nfd(instr, NEONFormatDecoder::LogicalFormatMap()); + VectorFormat vf = nfd.GetVectorFormat(); + + SimVRegister& rd = vreg(instr->Rd()); + SimVRegister& rn = vreg(instr->Rn()); + SimVRegister& rn2 = vreg((instr->Rn() + 1) % kNumberOfVRegisters); + SimVRegister& rn3 = vreg((instr->Rn() + 2) % kNumberOfVRegisters); + SimVRegister& rn4 = vreg((instr->Rn() + 3) % kNumberOfVRegisters); + SimVRegister& rm = vreg(instr->Rm()); + + switch (instr->Mask(NEONTableMask)) { + case NEON_TBL_1v: tbl(vf, rd, rn, rm); break; + case NEON_TBL_2v: tbl(vf, rd, rn, rn2, rm); break; + case NEON_TBL_3v: tbl(vf, rd, rn, rn2, rn3, rm); break; + case NEON_TBL_4v: tbl(vf, rd, rn, rn2, rn3, rn4, rm); break; + case NEON_TBX_1v: tbx(vf, rd, rn, rm); break; + case NEON_TBX_2v: tbx(vf, rd, rn, rn2, rm); break; + case NEON_TBX_3v: tbx(vf, rd, rn, rn2, rn3, rm); break; + case NEON_TBX_4v: tbx(vf, rd, rn, rn2, rn3, rn4, rm); break; + default: + VIXL_UNIMPLEMENTED(); + } +} + + +void Simulator::VisitNEONPerm(const Instruction* instr) { + NEONFormatDecoder nfd(instr); + VectorFormat vf = nfd.GetVectorFormat(); + + SimVRegister& rd = vreg(instr->Rd()); + SimVRegister& rn = vreg(instr->Rn()); + SimVRegister& rm = vreg(instr->Rm()); + + switch (instr->Mask(NEONPermMask)) { + case NEON_TRN1: trn1(vf, rd, rn, rm); break; + case NEON_TRN2: trn2(vf, rd, rn, rm); break; + case NEON_UZP1: uzp1(vf, rd, rn, rm); break; + case NEON_UZP2: uzp2(vf, rd, rn, rm); break; + case NEON_ZIP1: zip1(vf, rd, rn, rm); break; + case NEON_ZIP2: zip2(vf, rd, rn, rm); break; + default: + VIXL_UNIMPLEMENTED(); + } +} + + +void Simulator::DoUnreachable(const Instruction* instr) { + VIXL_ASSERT(instr->InstructionBits() == UNDEFINED_INST_PATTERN); + + fprintf(stream_, "Hit UNREACHABLE marker at pc=%p.\n", + reinterpret_cast<const void*>(instr)); + abort(); +} + + +void Simulator::DoTrace(const Instruction* instr) { + VIXL_ASSERT((instr->Mask(ExceptionMask) == HLT) && + (instr->ImmException() == kTraceOpcode)); + + // Read the arguments encoded inline in the instruction stream. + uint32_t parameters; + uint32_t command; + + VIXL_STATIC_ASSERT(sizeof(*instr) == 1); + memcpy(¶meters, instr + kTraceParamsOffset, sizeof(parameters)); + memcpy(&command, instr + kTraceCommandOffset, sizeof(command)); + + switch (command) { + case TRACE_ENABLE: + set_trace_parameters(trace_parameters() | parameters); + break; + case TRACE_DISABLE: + set_trace_parameters(trace_parameters() & ~parameters); + break; + default: + VIXL_UNREACHABLE(); + } + + set_pc(instr->InstructionAtOffset(kTraceLength)); +} + + +void Simulator::DoLog(const Instruction* instr) { + VIXL_ASSERT((instr->Mask(ExceptionMask) == HLT) && + (instr->ImmException() == kLogOpcode)); + + // Read the arguments encoded inline in the instruction stream. + uint32_t parameters; + + VIXL_STATIC_ASSERT(sizeof(*instr) == 1); + memcpy(¶meters, instr + kTraceParamsOffset, sizeof(parameters)); + + // We don't support a one-shot LOG_DISASM. + VIXL_ASSERT((parameters & LOG_DISASM) == 0); + // Print the requested information. + if (parameters & LOG_SYSREGS) PrintSystemRegisters(); + if (parameters & LOG_REGS) PrintRegisters(); + if (parameters & LOG_VREGS) PrintVRegisters(); + + set_pc(instr->InstructionAtOffset(kLogLength)); +} + + +void Simulator::DoPrintf(const Instruction* instr) { + VIXL_ASSERT((instr->Mask(ExceptionMask) == HLT) && + (instr->ImmException() == kPrintfOpcode)); + + // Read the arguments encoded inline in the instruction stream. + uint32_t arg_count; + uint32_t arg_pattern_list; + VIXL_STATIC_ASSERT(sizeof(*instr) == 1); + memcpy(&arg_count, + instr + kPrintfArgCountOffset, + sizeof(arg_count)); + memcpy(&arg_pattern_list, + instr + kPrintfArgPatternListOffset, + sizeof(arg_pattern_list)); + + VIXL_ASSERT(arg_count <= kPrintfMaxArgCount); + VIXL_ASSERT((arg_pattern_list >> (kPrintfArgPatternBits * arg_count)) == 0); + + // We need to call the host printf function with a set of arguments defined by + // arg_pattern_list. Because we don't know the types and sizes of the + // arguments, this is very difficult to do in a robust and portable way. To + // work around the problem, we pick apart the format string, and print one + // format placeholder at a time. + + // Allocate space for the format string. We take a copy, so we can modify it. + // Leave enough space for one extra character per expected argument (plus the + // '\0' termination). + const char * format_base = reg<const char *>(0); + VIXL_ASSERT(format_base != NULL); + size_t length = strlen(format_base) + 1; + char * const format = (char *)js_calloc(length + arg_count); + + // A list of chunks, each with exactly one format placeholder. + const char * chunks[kPrintfMaxArgCount]; + + // Copy the format string and search for format placeholders. + uint32_t placeholder_count = 0; + char * format_scratch = format; + for (size_t i = 0; i < length; i++) { + if (format_base[i] != '%') { + *format_scratch++ = format_base[i]; + } else { + if (format_base[i + 1] == '%') { + // Ignore explicit "%%" sequences. + *format_scratch++ = format_base[i]; + i++; + // Chunks after the first are passed as format strings to printf, so we + // need to escape '%' characters in those chunks. + if (placeholder_count > 0) *format_scratch++ = format_base[i]; + } else { + VIXL_CHECK(placeholder_count < arg_count); + // Insert '\0' before placeholders, and store their locations. + *format_scratch++ = '\0'; + chunks[placeholder_count++] = format_scratch; + *format_scratch++ = format_base[i]; + } + } + } + VIXL_CHECK(placeholder_count == arg_count); + + // Finally, call printf with each chunk, passing the appropriate register + // argument. Normally, printf returns the number of bytes transmitted, so we + // can emulate a single printf call by adding the result from each chunk. If + // any call returns a negative (error) value, though, just return that value. + + printf("%s", clr_printf); + + // Because '\0' is inserted before each placeholder, the first string in + // 'format' contains no format placeholders and should be printed literally. + int result = printf("%s", format); + int pcs_r = 1; // Start at x1. x0 holds the format string. + int pcs_f = 0; // Start at d0. + if (result >= 0) { + for (uint32_t i = 0; i < placeholder_count; i++) { + int part_result = -1; + + uint32_t arg_pattern = arg_pattern_list >> (i * kPrintfArgPatternBits); + arg_pattern &= (1 << kPrintfArgPatternBits) - 1; + switch (arg_pattern) { + case kPrintfArgW: part_result = printf(chunks[i], wreg(pcs_r++)); break; + case kPrintfArgX: part_result = printf(chunks[i], xreg(pcs_r++)); break; + case kPrintfArgD: part_result = printf(chunks[i], dreg(pcs_f++)); break; + default: VIXL_UNREACHABLE(); + } + + if (part_result < 0) { + // Handle error values. + result = part_result; + break; + } + + result += part_result; + } + } + + printf("%s", clr_normal); + + // Printf returns its result in x0 (just like the C library's printf). + set_xreg(0, result); + + // The printf parameters are inlined in the code, so skip them. + set_pc(instr->InstructionAtOffset(kPrintfLength)); + + // Set LR as if we'd just called a native printf function. + set_lr(pc()); + + js_free(format); +} + +} // namespace vixl + +#endif // JS_SIMULATOR_ARM64 |