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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ * vim: set ts=8 sts=4 et sw=4 tw=99: */
+// Copyright 2011 the V8 project 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 Google Inc. 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 AND 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 "jit/mips64/Simulator-mips64.h"
+
+#include "mozilla/Casting.h"
+#include "mozilla/FloatingPoint.h"
+#include "mozilla/IntegerPrintfMacros.h"
+#include "mozilla/Likely.h"
+#include "mozilla/MathAlgorithms.h"
+
+#include <float.h>
+
+#include "jit/mips64/Assembler-mips64.h"
+#include "threading/LockGuard.h"
+#include "vm/Runtime.h"
+
+#define I8(v) static_cast<int8_t>(v)
+#define I16(v) static_cast<int16_t>(v)
+#define U16(v) static_cast<uint16_t>(v)
+#define I32(v) static_cast<int32_t>(v)
+#define U32(v) static_cast<uint32_t>(v)
+#define I64(v) static_cast<int64_t>(v)
+#define U64(v) static_cast<uint64_t>(v)
+#define I128(v) static_cast<__int128_t>(v)
+#define U128(v) static_cast<__uint128_t>(v)
+
+namespace js {
+namespace jit {
+
+static const Instr kCallRedirInstr = op_special | MAX_BREAK_CODE << FunctionBits | ff_break;
+
+// Utils functions.
+static uint32_t
+GetFCSRConditionBit(uint32_t cc)
+{
+ if (cc == 0)
+ return 23;
+ return 24 + cc;
+}
+
+// -----------------------------------------------------------------------------
+// MIPS assembly various constants.
+
+class SimInstruction
+{
+ public:
+ enum {
+ kInstrSize = 4,
+ // On MIPS PC cannot actually be directly accessed. We behave as if PC was
+ // always the value of the current instruction being executed.
+ kPCReadOffset = 0
+ };
+
+ // Get the raw instruction bits.
+ inline Instr instructionBits() const {
+ return *reinterpret_cast<const Instr*>(this);
+ }
+
+ // Set the raw instruction bits to value.
+ inline void setInstructionBits(Instr value) {
+ *reinterpret_cast<Instr*>(this) = value;
+ }
+
+ // Read one particular bit out of the instruction bits.
+ inline int bit(int nr) const {
+ return (instructionBits() >> nr) & 1;
+ }
+
+ // Read a bit field out of the instruction bits.
+ inline int bits(int hi, int lo) const {
+ return (instructionBits() >> lo) & ((2 << (hi - lo)) - 1);
+ }
+
+ // Instruction type.
+ enum Type {
+ kRegisterType,
+ kImmediateType,
+ kJumpType,
+ kUnsupported = -1
+ };
+
+ // Get the encoding type of the instruction.
+ Type instructionType() const;
+
+
+ // Accessors for the different named fields used in the MIPS encoding.
+ inline Opcode opcodeValue() const {
+ return static_cast<Opcode>(bits(OpcodeShift + OpcodeBits - 1, OpcodeShift));
+ }
+
+ inline int rsValue() const {
+ MOZ_ASSERT(instructionType() == kRegisterType || instructionType() == kImmediateType);
+ return bits(RSShift + RSBits - 1, RSShift);
+ }
+
+ inline int rtValue() const {
+ MOZ_ASSERT(instructionType() == kRegisterType || instructionType() == kImmediateType);
+ return bits(RTShift + RTBits - 1, RTShift);
+ }
+
+ inline int rdValue() const {
+ MOZ_ASSERT(instructionType() == kRegisterType);
+ return bits(RDShift + RDBits - 1, RDShift);
+ }
+
+ inline int saValue() const {
+ MOZ_ASSERT(instructionType() == kRegisterType);
+ return bits(SAShift + SABits - 1, SAShift);
+ }
+
+ inline int functionValue() const {
+ MOZ_ASSERT(instructionType() == kRegisterType || instructionType() == kImmediateType);
+ return bits(FunctionShift + FunctionBits - 1, FunctionShift);
+ }
+
+ inline int fdValue() const {
+ return bits(FDShift + FDBits - 1, FDShift);
+ }
+
+ inline int fsValue() const {
+ return bits(FSShift + FSBits - 1, FSShift);
+ }
+
+ inline int ftValue() const {
+ return bits(FTShift + FTBits - 1, FTShift);
+ }
+
+ inline int frValue() const {
+ return bits(FRShift + FRBits - 1, FRShift);
+ }
+
+ // Float Compare condition code instruction bits.
+ inline int fcccValue() const {
+ return bits(FCccShift + FCccBits - 1, FCccShift);
+ }
+
+ // Float Branch condition code instruction bits.
+ inline int fbccValue() const {
+ return bits(FBccShift + FBccBits - 1, FBccShift);
+ }
+
+ // Float Branch true/false instruction bit.
+ inline int fbtrueValue() const {
+ return bits(FBtrueShift + FBtrueBits - 1, FBtrueShift);
+ }
+
+ // Return the fields at their original place in the instruction encoding.
+ inline Opcode opcodeFieldRaw() const {
+ return static_cast<Opcode>(instructionBits() & OpcodeMask);
+ }
+
+ inline int rsFieldRaw() const {
+ MOZ_ASSERT(instructionType() == kRegisterType || instructionType() == kImmediateType);
+ return instructionBits() & RSMask;
+ }
+
+ // Same as above function, but safe to call within instructionType().
+ inline int rsFieldRawNoAssert() const {
+ return instructionBits() & RSMask;
+ }
+
+ inline int rtFieldRaw() const {
+ MOZ_ASSERT(instructionType() == kRegisterType || instructionType() == kImmediateType);
+ return instructionBits() & RTMask;
+ }
+
+ inline int rdFieldRaw() const {
+ MOZ_ASSERT(instructionType() == kRegisterType);
+ return instructionBits() & RDMask;
+ }
+
+ inline int saFieldRaw() const {
+ MOZ_ASSERT(instructionType() == kRegisterType);
+ return instructionBits() & SAMask;
+ }
+
+ inline int functionFieldRaw() const {
+ return instructionBits() & FunctionMask;
+ }
+
+ // Get the secondary field according to the opcode.
+ inline int secondaryValue() const {
+ Opcode op = opcodeFieldRaw();
+ switch (op) {
+ case op_special:
+ case op_special2:
+ return functionValue();
+ case op_cop1:
+ return rsValue();
+ case op_regimm:
+ return rtValue();
+ default:
+ return ff_null;
+ }
+ }
+
+ inline int32_t imm16Value() const {
+ MOZ_ASSERT(instructionType() == kImmediateType);
+ return bits(Imm16Shift + Imm16Bits - 1, Imm16Shift);
+ }
+
+ inline int32_t imm26Value() const {
+ MOZ_ASSERT(instructionType() == kJumpType);
+ return bits(Imm26Shift + Imm26Bits - 1, Imm26Shift);
+ }
+
+ // Say if the instruction should not be used in a branch delay slot.
+ bool isForbiddenInBranchDelay() const;
+ // Say if the instruction 'links'. e.g. jal, bal.
+ bool isLinkingInstruction() const;
+ // Say if the instruction is a break or a trap.
+ bool isTrap() const;
+
+ private:
+
+ SimInstruction() = delete;
+ SimInstruction(const SimInstruction& other) = delete;
+ void operator=(const SimInstruction& other) = delete;
+};
+
+bool
+SimInstruction::isForbiddenInBranchDelay() const
+{
+ const int op = opcodeFieldRaw();
+ switch (op) {
+ case op_j:
+ case op_jal:
+ case op_beq:
+ case op_bne:
+ case op_blez:
+ case op_bgtz:
+ case op_beql:
+ case op_bnel:
+ case op_blezl:
+ case op_bgtzl:
+ return true;
+ case op_regimm:
+ switch (rtFieldRaw()) {
+ case rt_bltz:
+ case rt_bgez:
+ case rt_bltzal:
+ case rt_bgezal:
+ return true;
+ default:
+ return false;
+ };
+ break;
+ case op_special:
+ switch (functionFieldRaw()) {
+ case ff_jr:
+ case ff_jalr:
+ return true;
+ default:
+ return false;
+ };
+ break;
+ default:
+ return false;
+ };
+}
+
+bool
+SimInstruction::isLinkingInstruction() const
+{
+ const int op = opcodeFieldRaw();
+ switch (op) {
+ case op_jal:
+ return true;
+ case op_regimm:
+ switch (rtFieldRaw()) {
+ case rt_bgezal:
+ case rt_bltzal:
+ return true;
+ default:
+ return false;
+ };
+ case op_special:
+ switch (functionFieldRaw()) {
+ case ff_jalr:
+ return true;
+ default:
+ return false;
+ };
+ default:
+ return false;
+ };
+}
+
+bool
+SimInstruction::isTrap() const
+{
+ if (opcodeFieldRaw() != op_special) {
+ return false;
+ } else {
+ switch (functionFieldRaw()) {
+ case ff_break:
+ case ff_tge:
+ case ff_tgeu:
+ case ff_tlt:
+ case ff_tltu:
+ case ff_teq:
+ case ff_tne:
+ return true;
+ default:
+ return false;
+ };
+ }
+}
+
+SimInstruction::Type
+SimInstruction::instructionType() const
+{
+ switch (opcodeFieldRaw()) {
+ case op_special:
+ switch (functionFieldRaw()) {
+ case ff_jr:
+ case ff_jalr:
+ case ff_sync:
+ case ff_break:
+ case ff_sll:
+ case ff_dsll:
+ case ff_dsll32:
+ case ff_srl:
+ case ff_dsrl:
+ case ff_dsrl32:
+ case ff_sra:
+ case ff_dsra:
+ case ff_dsra32:
+ case ff_sllv:
+ case ff_dsllv:
+ case ff_srlv:
+ case ff_dsrlv:
+ case ff_srav:
+ case ff_dsrav:
+ case ff_mfhi:
+ case ff_mflo:
+ case ff_mult:
+ case ff_dmult:
+ case ff_multu:
+ case ff_dmultu:
+ case ff_div:
+ case ff_ddiv:
+ case ff_divu:
+ case ff_ddivu:
+ case ff_add:
+ case ff_dadd:
+ case ff_addu:
+ case ff_daddu:
+ case ff_sub:
+ case ff_dsub:
+ case ff_subu:
+ case ff_dsubu:
+ case ff_and:
+ case ff_or:
+ case ff_xor:
+ case ff_nor:
+ case ff_slt:
+ case ff_sltu:
+ case ff_tge:
+ case ff_tgeu:
+ case ff_tlt:
+ case ff_tltu:
+ case ff_teq:
+ case ff_tne:
+ case ff_movz:
+ case ff_movn:
+ case ff_movci:
+ return kRegisterType;
+ default:
+ return kUnsupported;
+ };
+ break;
+ case op_special2:
+ switch (functionFieldRaw()) {
+ case ff_mul:
+ case ff_clz:
+ case ff_dclz:
+ return kRegisterType;
+ default:
+ return kUnsupported;
+ };
+ break;
+ case op_special3:
+ switch (functionFieldRaw()) {
+ case ff_ins:
+ case ff_dins:
+ case ff_dinsm:
+ case ff_dinsu:
+ case ff_ext:
+ case ff_dext:
+ case ff_dextm:
+ case ff_dextu:
+ case ff_bshfl:
+ return kRegisterType;
+ default:
+ return kUnsupported;
+ };
+ break;
+ case op_cop1: // Coprocessor instructions.
+ switch (rsFieldRawNoAssert()) {
+ case rs_bc1: // Branch on coprocessor condition.
+ return kImmediateType;
+ default:
+ return kRegisterType;
+ };
+ break;
+ case op_cop1x:
+ return kRegisterType;
+ // 16 bits Immediate type instructions. e.g.: addi dest, src, imm16.
+ case op_regimm:
+ case op_beq:
+ case op_bne:
+ case op_blez:
+ case op_bgtz:
+ case op_addi:
+ case op_daddi:
+ case op_addiu:
+ case op_daddiu:
+ case op_slti:
+ case op_sltiu:
+ case op_andi:
+ case op_ori:
+ case op_xori:
+ case op_lui:
+ case op_beql:
+ case op_bnel:
+ case op_blezl:
+ case op_bgtzl:
+ case op_lb:
+ case op_lbu:
+ case op_lh:
+ case op_lhu:
+ case op_lw:
+ case op_lwu:
+ case op_lwl:
+ case op_lwr:
+ case op_ll:
+ case op_ld:
+ case op_ldl:
+ case op_ldr:
+ case op_sb:
+ case op_sh:
+ case op_sw:
+ case op_swl:
+ case op_swr:
+ case op_sc:
+ case op_sd:
+ case op_sdl:
+ case op_sdr:
+ case op_lwc1:
+ case op_ldc1:
+ case op_swc1:
+ case op_sdc1:
+ return kImmediateType;
+ // 26 bits immediate type instructions. e.g.: j imm26.
+ case op_j:
+ case op_jal:
+ return kJumpType;
+ default:
+ return kUnsupported;
+ };
+ return kUnsupported;
+}
+
+// C/C++ argument slots size.
+const int kCArgSlotCount = 0;
+const int kCArgsSlotsSize = kCArgSlotCount * sizeof(uintptr_t);
+const int kBranchReturnOffset = 2 * SimInstruction::kInstrSize;
+
+class CachePage {
+ public:
+ static const int LINE_VALID = 0;
+ static const int LINE_INVALID = 1;
+
+ static const int kPageShift = 12;
+ static const int kPageSize = 1 << kPageShift;
+ static const int kPageMask = kPageSize - 1;
+ static const int kLineShift = 2; // The cache line is only 4 bytes right now.
+ static const int kLineLength = 1 << kLineShift;
+ static const int kLineMask = kLineLength - 1;
+
+ CachePage() {
+ memset(&validity_map_, LINE_INVALID, sizeof(validity_map_));
+ }
+
+ char* validityByte(int offset) {
+ return &validity_map_[offset >> kLineShift];
+ }
+
+ char* cachedData(int offset) {
+ return &data_[offset];
+ }
+
+ private:
+ char data_[kPageSize]; // The cached data.
+ static const int kValidityMapSize = kPageSize >> kLineShift;
+ char validity_map_[kValidityMapSize]; // One byte per line.
+};
+
+// Protects the icache() and redirection() properties of the
+// Simulator.
+class AutoLockSimulatorCache : public LockGuard<Mutex>
+{
+ using Base = LockGuard<Mutex>;
+
+ public:
+ explicit AutoLockSimulatorCache(Simulator* sim)
+ : Base(sim->cacheLock_)
+ , sim_(sim)
+ {
+ MOZ_ASSERT(sim_->cacheLockHolder_.isNothing());
+#ifdef DEBUG
+ sim_->cacheLockHolder_ = mozilla::Some(ThisThread::GetId());
+#endif
+ }
+
+ ~AutoLockSimulatorCache() {
+ MOZ_ASSERT(sim_->cacheLockHolder_.isSome());
+#ifdef DEBUG
+ sim_->cacheLockHolder_.reset();
+#endif
+ }
+
+ private:
+ Simulator* const sim_;
+};
+
+bool Simulator::ICacheCheckingEnabled = false;
+
+int64_t Simulator::StopSimAt = -1;
+
+Simulator *
+Simulator::Create(JSContext* cx)
+{
+ Simulator* sim = js_new<Simulator>();
+ if (!sim)
+ return nullptr;
+
+ if (!sim->init()) {
+ js_delete(sim);
+ return nullptr;
+ }
+
+ if (getenv("MIPS_SIM_ICACHE_CHECKS"))
+ Simulator::ICacheCheckingEnabled = true;
+
+ int64_t stopAt;
+ char* stopAtStr = getenv("MIPS_SIM_STOP_AT");
+ if (stopAtStr && sscanf(stopAtStr, "%" PRIi64, &stopAt) == 1) {
+ fprintf(stderr, "\nStopping simulation at icount %" PRIi64 "\n", stopAt);
+ Simulator::StopSimAt = stopAt;
+ }
+
+ return sim;
+}
+
+void
+Simulator::Destroy(Simulator* sim)
+{
+ js_delete(sim);
+}
+
+// The MipsDebugger class is used by the simulator while debugging simulated
+// code.
+class MipsDebugger
+{
+ public:
+ explicit MipsDebugger(Simulator* sim) : sim_(sim) { }
+
+ void stop(SimInstruction* instr);
+ void debug();
+ // Print all registers with a nice formatting.
+ void printAllRegs();
+ void printAllRegsIncludingFPU();
+
+ private:
+ // We set the breakpoint code to 0xfffff to easily recognize it.
+ static const Instr kBreakpointInstr = op_special | ff_break | 0xfffff << 6;
+ static const Instr kNopInstr = op_special | ff_sll;
+
+ Simulator* sim_;
+
+ int64_t getRegisterValue(int regnum);
+ int64_t getFPURegisterValueLong(int regnum);
+ float getFPURegisterValueFloat(int regnum);
+ double getFPURegisterValueDouble(int regnum);
+ bool getValue(const char* desc, int64_t* value);
+
+ // Set or delete a breakpoint. Returns true if successful.
+ bool setBreakpoint(SimInstruction* breakpc);
+ bool deleteBreakpoint(SimInstruction* breakpc);
+
+ // Undo and redo all breakpoints. This is needed to bracket disassembly and
+ // execution to skip past breakpoints when run from the debugger.
+ void undoBreakpoints();
+ void redoBreakpoints();
+};
+
+static void
+UNSUPPORTED()
+{
+ printf("Unsupported instruction.\n");
+ MOZ_CRASH();
+}
+
+void
+MipsDebugger::stop(SimInstruction* instr)
+{
+ // Get the stop code.
+ uint32_t code = instr->bits(25, 6);
+ // Retrieve the encoded address, which comes just after this stop.
+ char* msg = *reinterpret_cast<char**>(sim_->get_pc() +
+ SimInstruction::kInstrSize);
+ // Update this stop description.
+ if (!sim_->watchedStops_[code].desc_)
+ sim_->watchedStops_[code].desc_ = msg;
+ // Print the stop message and code if it is not the default code.
+ if (code != kMaxStopCode)
+ printf("Simulator hit stop %u: %s\n", code, msg);
+ else
+ printf("Simulator hit %s\n", msg);
+ sim_->set_pc(sim_->get_pc() + 2 * SimInstruction::kInstrSize);
+ debug();
+}
+
+int64_t
+MipsDebugger::getRegisterValue(int regnum)
+{
+ if (regnum == kPCRegister)
+ return sim_->get_pc();
+ return sim_->getRegister(regnum);
+}
+
+int64_t
+MipsDebugger::getFPURegisterValueLong(int regnum)
+{
+ return sim_->getFpuRegister(regnum);
+}
+
+float
+MipsDebugger::getFPURegisterValueFloat(int regnum)
+{
+ return sim_->getFpuRegisterFloat(regnum);
+}
+
+double
+MipsDebugger::getFPURegisterValueDouble(int regnum)
+{
+ return sim_->getFpuRegisterDouble(regnum);
+}
+
+bool
+MipsDebugger::getValue(const char* desc, int64_t* value)
+{
+ Register reg = Register::FromName(desc);
+ if (reg != InvalidReg) {
+ *value = getRegisterValue(reg.code());
+ return true;
+ }
+
+ if (strncmp(desc, "0x", 2) == 0)
+ return sscanf(desc, "%" PRIu64, reinterpret_cast<uint64_t*>(value)) == 1;
+ return sscanf(desc, "%" PRIi64, value) == 1;
+}
+
+bool
+MipsDebugger::setBreakpoint(SimInstruction* breakpc)
+{
+ // Check if a breakpoint can be set. If not return without any side-effects.
+ if (sim_->break_pc_ != nullptr)
+ return false;
+
+ // Set the breakpoint.
+ sim_->break_pc_ = breakpc;
+ sim_->break_instr_ = breakpc->instructionBits();
+ // Not setting the breakpoint instruction in the code itself. It will be set
+ // when the debugger shell continues.
+ return true;
+
+}
+
+bool
+MipsDebugger::deleteBreakpoint(SimInstruction* breakpc)
+{
+ if (sim_->break_pc_ != nullptr)
+ sim_->break_pc_->setInstructionBits(sim_->break_instr_);
+
+ sim_->break_pc_ = nullptr;
+ sim_->break_instr_ = 0;
+ return true;
+}
+
+void
+MipsDebugger::undoBreakpoints()
+{
+ if (sim_->break_pc_)
+ sim_->break_pc_->setInstructionBits(sim_->break_instr_);
+}
+
+void
+MipsDebugger::redoBreakpoints()
+{
+ if (sim_->break_pc_)
+ sim_->break_pc_->setInstructionBits(kBreakpointInstr);
+}
+
+void
+MipsDebugger::printAllRegs()
+{
+ int64_t value;
+ for (uint32_t i = 0; i < Registers::Total; i++) {
+ value = getRegisterValue(i);
+ printf("%3s: 0x%016" PRIx64 " %20" PRIi64 " ", Registers::GetName(i), value, value);
+
+ if (i % 2)
+ printf("\n");
+ }
+ printf("\n");
+
+ value = getRegisterValue(Simulator::LO);
+ printf(" LO: 0x%016" PRIx64 " %20" PRIi64 " ", value, value);
+ value = getRegisterValue(Simulator::HI);
+ printf(" HI: 0x%016" PRIx64 " %20" PRIi64 "\n", value, value);
+ value = getRegisterValue(Simulator::pc);
+ printf(" pc: 0x%016" PRIx64 "\n", value);
+}
+
+void
+MipsDebugger::printAllRegsIncludingFPU()
+{
+ printAllRegs();
+
+ printf("\n\n");
+ // f0, f1, f2, ... f31.
+ for (uint32_t i = 0; i < FloatRegisters::TotalPhys; i++) {
+ printf("%3s: 0x%016" PRIi64 "\tflt: %-8.4g\tdbl: %-16.4g\n",
+ FloatRegisters::GetName(i),
+ getFPURegisterValueLong(i),
+ getFPURegisterValueFloat(i),
+ getFPURegisterValueDouble(i));
+ }
+}
+
+static char*
+ReadLine(const char* prompt)
+{
+ char* result = nullptr;
+ char lineBuf[256];
+ int offset = 0;
+ bool keepGoing = true;
+ fprintf(stdout, "%s", prompt);
+ fflush(stdout);
+ while (keepGoing) {
+ if (fgets(lineBuf, sizeof(lineBuf), stdin) == nullptr) {
+ // fgets got an error. Just give up.
+ if (result)
+ js_delete(result);
+ return nullptr;
+ }
+ int len = strlen(lineBuf);
+ if (len > 0 && lineBuf[len - 1] == '\n') {
+ // Since we read a new line we are done reading the line. This
+ // will exit the loop after copying this buffer into the result.
+ keepGoing = false;
+ }
+ if (!result) {
+ // Allocate the initial result and make room for the terminating '\0'
+ result = (char*)js_malloc(len + 1);
+ if (!result)
+ return nullptr;
+ } else {
+ // Allocate a new result with enough room for the new addition.
+ int new_len = offset + len + 1;
+ char* new_result = (char*)js_malloc(new_len);
+ if (!new_result)
+ return nullptr;
+ // Copy the existing input into the new array and set the new
+ // array as the result.
+ memcpy(new_result, result, offset * sizeof(char));
+ js_free(result);
+ result = new_result;
+ }
+ // Copy the newly read line into the result.
+ memcpy(result + offset, lineBuf, len * sizeof(char));
+ offset += len;
+ }
+
+ MOZ_ASSERT(result);
+ result[offset] = '\0';
+ return result;
+}
+
+static void
+DisassembleInstruction(uint64_t pc)
+{
+ uint8_t* bytes = reinterpret_cast<uint8_t*>(pc);
+ char hexbytes[256];
+ sprintf(hexbytes, "0x%x 0x%x 0x%x 0x%x", bytes[0], bytes[1], bytes[2], bytes[3]);
+ char llvmcmd[1024];
+ sprintf(llvmcmd, "bash -c \"echo -n '%p'; echo '%s' | "
+ "llvm-mc -disassemble -arch=mips64el -mcpu=mips64r2 | "
+ "grep -v pure_instructions | grep -v .text\"", static_cast<void*>(bytes), hexbytes);
+ if (system(llvmcmd))
+ printf("Cannot disassemble instruction.\n");
+}
+
+void
+MipsDebugger::debug()
+{
+ intptr_t lastPC = -1;
+ bool done = false;
+
+#define COMMAND_SIZE 63
+#define ARG_SIZE 255
+
+#define STR(a) #a
+#define XSTR(a) STR(a)
+
+ char cmd[COMMAND_SIZE + 1];
+ char arg1[ARG_SIZE + 1];
+ char arg2[ARG_SIZE + 1];
+ char* argv[3] = { cmd, arg1, arg2 };
+
+ // Make sure to have a proper terminating character if reaching the limit.
+ cmd[COMMAND_SIZE] = 0;
+ arg1[ARG_SIZE] = 0;
+ arg2[ARG_SIZE] = 0;
+
+ // Undo all set breakpoints while running in the debugger shell. This will
+ // make them invisible to all commands.
+ undoBreakpoints();
+
+ while (!done && (sim_->get_pc() != Simulator::end_sim_pc)) {
+ if (lastPC != sim_->get_pc()) {
+ DisassembleInstruction(sim_->get_pc());
+ lastPC = sim_->get_pc();
+ }
+ char* line = ReadLine("sim> ");
+ if (line == nullptr) {
+ break;
+ } else {
+ char* last_input = sim_->lastDebuggerInput();
+ if (strcmp(line, "\n") == 0 && last_input != nullptr) {
+ line = last_input;
+ } else {
+ // Ownership is transferred to sim_;
+ sim_->setLastDebuggerInput(line);
+ }
+ // Use sscanf to parse the individual parts of the command line. At the
+ // moment no command expects more than two parameters.
+ int argc = sscanf(line,
+ "%" XSTR(COMMAND_SIZE) "s "
+ "%" XSTR(ARG_SIZE) "s "
+ "%" XSTR(ARG_SIZE) "s",
+ cmd, arg1, arg2);
+ if ((strcmp(cmd, "si") == 0) || (strcmp(cmd, "stepi") == 0)) {
+ SimInstruction* instr = reinterpret_cast<SimInstruction*>(sim_->get_pc());
+ if (!(instr->isTrap()) ||
+ instr->instructionBits() == kCallRedirInstr) {
+ sim_->instructionDecode(
+ reinterpret_cast<SimInstruction*>(sim_->get_pc()));
+ } else {
+ // Allow si to jump over generated breakpoints.
+ printf("/!\\ Jumping over generated breakpoint.\n");
+ sim_->set_pc(sim_->get_pc() + SimInstruction::kInstrSize);
+ }
+ } else if ((strcmp(cmd, "c") == 0) || (strcmp(cmd, "cont") == 0)) {
+ // Execute the one instruction we broke at with breakpoints disabled.
+ sim_->instructionDecode(reinterpret_cast<SimInstruction*>(sim_->get_pc()));
+ // Leave the debugger shell.
+ done = true;
+ } else if ((strcmp(cmd, "p") == 0) || (strcmp(cmd, "print") == 0)) {
+ if (argc == 2) {
+ int64_t value;
+ if (strcmp(arg1, "all") == 0) {
+ printAllRegs();
+ } else if (strcmp(arg1, "allf") == 0) {
+ printAllRegsIncludingFPU();
+ } else {
+ Register reg = Register::FromName(arg1);
+ FloatRegisters::Encoding fReg = FloatRegisters::FromName(arg1);
+ if (reg != InvalidReg) {
+ value = getRegisterValue(reg.code());
+ printf("%s: 0x%016" PRIi64 " %20" PRIi64 " \n", arg1, value, value);
+ } else if (fReg != FloatRegisters::Invalid) {
+ printf("%3s: 0x%016" PRIi64 "\tflt: %-8.4g\tdbl: %-16.4g\n",
+ FloatRegisters::GetName(fReg),
+ getFPURegisterValueLong(fReg),
+ getFPURegisterValueFloat(fReg),
+ getFPURegisterValueDouble(fReg));
+ } else {
+ printf("%s unrecognized\n", arg1);
+ }
+ }
+ } else {
+ printf("print <register> or print <fpu register> single\n");
+ }
+ } else if (strcmp(cmd, "stack") == 0 || strcmp(cmd, "mem") == 0) {
+ int64_t* cur = nullptr;
+ int64_t* end = nullptr;
+ int next_arg = 1;
+
+ if (strcmp(cmd, "stack") == 0) {
+ cur = reinterpret_cast<int64_t*>(sim_->getRegister(Simulator::sp));
+ } else { // Command "mem".
+ int64_t value;
+ if (!getValue(arg1, &value)) {
+ printf("%s unrecognized\n", arg1);
+ continue;
+ }
+ cur = reinterpret_cast<int64_t*>(value);
+ next_arg++;
+ }
+
+ int64_t words;
+ if (argc == next_arg) {
+ words = 10;
+ } else {
+ if (!getValue(argv[next_arg], &words)) {
+ words = 10;
+ }
+ }
+ end = cur + words;
+
+ while (cur < end) {
+ printf(" %p: 0x%016" PRIx64 " %20" PRIi64, cur, *cur, *cur);
+ printf("\n");
+ cur++;
+ }
+
+ } else if ((strcmp(cmd, "disasm") == 0) ||
+ (strcmp(cmd, "dpc") == 0) ||
+ (strcmp(cmd, "di") == 0)) {
+ uint8_t* cur = nullptr;
+ uint8_t* end = nullptr;
+
+ if (argc == 1) {
+ cur = reinterpret_cast<uint8_t*>(sim_->get_pc());
+ end = cur + (10 * SimInstruction::kInstrSize);
+ } else if (argc == 2) {
+ Register reg = Register::FromName(arg1);
+ if (reg != InvalidReg || strncmp(arg1, "0x", 2) == 0) {
+ // The argument is an address or a register name.
+ int64_t value;
+ if (getValue(arg1, &value)) {
+ cur = reinterpret_cast<uint8_t*>(value);
+ // Disassemble 10 instructions at <arg1>.
+ end = cur + (10 * SimInstruction::kInstrSize);
+ }
+ } else {
+ // The argument is the number of instructions.
+ int64_t value;
+ if (getValue(arg1, &value)) {
+ cur = reinterpret_cast<uint8_t*>(sim_->get_pc());
+ // Disassemble <arg1> instructions.
+ end = cur + (value * SimInstruction::kInstrSize);
+ }
+ }
+ } else {
+ int64_t value1;
+ int64_t value2;
+ if (getValue(arg1, &value1) && getValue(arg2, &value2)) {
+ cur = reinterpret_cast<uint8_t*>(value1);
+ end = cur + (value2 * SimInstruction::kInstrSize);
+ }
+ }
+
+ while (cur < end) {
+ DisassembleInstruction(uint64_t(cur));
+ cur += SimInstruction::kInstrSize;
+ }
+ } else if (strcmp(cmd, "gdb") == 0) {
+ printf("relinquishing control to gdb\n");
+ asm("int $3");
+ printf("regaining control from gdb\n");
+ } else if (strcmp(cmd, "break") == 0) {
+ if (argc == 2) {
+ int64_t value;
+ if (getValue(arg1, &value)) {
+ if (!setBreakpoint(reinterpret_cast<SimInstruction*>(value)))
+ printf("setting breakpoint failed\n");
+ } else {
+ printf("%s unrecognized\n", arg1);
+ }
+ } else {
+ printf("break <address>\n");
+ }
+ } else if (strcmp(cmd, "del") == 0) {
+ if (!deleteBreakpoint(nullptr)) {
+ printf("deleting breakpoint failed\n");
+ }
+ } else if (strcmp(cmd, "flags") == 0) {
+ printf("No flags on MIPS !\n");
+ } else if (strcmp(cmd, "stop") == 0) {
+ int64_t value;
+ intptr_t stop_pc = sim_->get_pc() -
+ 2 * SimInstruction::kInstrSize;
+ SimInstruction* stop_instr = reinterpret_cast<SimInstruction*>(stop_pc);
+ SimInstruction* msg_address =
+ reinterpret_cast<SimInstruction*>(stop_pc +
+ SimInstruction::kInstrSize);
+ if ((argc == 2) && (strcmp(arg1, "unstop") == 0)) {
+ // Remove the current stop.
+ if (sim_->isStopInstruction(stop_instr)) {
+ stop_instr->setInstructionBits(kNopInstr);
+ msg_address->setInstructionBits(kNopInstr);
+ } else {
+ printf("Not at debugger stop.\n");
+ }
+ } else if (argc == 3) {
+ // Print information about all/the specified breakpoint(s).
+ if (strcmp(arg1, "info") == 0) {
+ if (strcmp(arg2, "all") == 0) {
+ printf("Stop information:\n");
+ for (uint32_t i = kMaxWatchpointCode + 1;
+ i <= kMaxStopCode;
+ i++) {
+ sim_->printStopInfo(i);
+ }
+ } else if (getValue(arg2, &value)) {
+ sim_->printStopInfo(value);
+ } else {
+ printf("Unrecognized argument.\n");
+ }
+ } else if (strcmp(arg1, "enable") == 0) {
+ // Enable all/the specified breakpoint(s).
+ if (strcmp(arg2, "all") == 0) {
+ for (uint32_t i = kMaxWatchpointCode + 1;
+ i <= kMaxStopCode;
+ i++) {
+ sim_->enableStop(i);
+ }
+ } else if (getValue(arg2, &value)) {
+ sim_->enableStop(value);
+ } else {
+ printf("Unrecognized argument.\n");
+ }
+ } else if (strcmp(arg1, "disable") == 0) {
+ // Disable all/the specified breakpoint(s).
+ if (strcmp(arg2, "all") == 0) {
+ for (uint32_t i = kMaxWatchpointCode + 1;
+ i <= kMaxStopCode;
+ i++) {
+ sim_->disableStop(i);
+ }
+ } else if (getValue(arg2, &value)) {
+ sim_->disableStop(value);
+ } else {
+ printf("Unrecognized argument.\n");
+ }
+ }
+ } else {
+ printf("Wrong usage. Use help command for more information.\n");
+ }
+ } else if ((strcmp(cmd, "h") == 0) || (strcmp(cmd, "help") == 0)) {
+ printf("cont\n");
+ printf(" continue execution (alias 'c')\n");
+ printf("stepi\n");
+ printf(" step one instruction (alias 'si')\n");
+ printf("print <register>\n");
+ printf(" print register content (alias 'p')\n");
+ printf(" use register name 'all' to print all registers\n");
+ printf("printobject <register>\n");
+ printf(" print an object from a register (alias 'po')\n");
+ printf("stack [<words>]\n");
+ printf(" dump stack content, default dump 10 words)\n");
+ printf("mem <address> [<words>]\n");
+ printf(" dump memory content, default dump 10 words)\n");
+ printf("flags\n");
+ printf(" print flags\n");
+ printf("disasm [<instructions>]\n");
+ printf("disasm [<address/register>]\n");
+ printf("disasm [[<address/register>] <instructions>]\n");
+ printf(" disassemble code, default is 10 instructions\n");
+ printf(" from pc (alias 'di')\n");
+ printf("gdb\n");
+ printf(" enter gdb\n");
+ printf("break <address>\n");
+ printf(" set a break point on the address\n");
+ printf("del\n");
+ printf(" delete the breakpoint\n");
+ printf("stop feature:\n");
+ printf(" Description:\n");
+ printf(" Stops are debug instructions inserted by\n");
+ printf(" the Assembler::stop() function.\n");
+ printf(" When hitting a stop, the Simulator will\n");
+ printf(" stop and and give control to the Debugger.\n");
+ printf(" All stop codes are watched:\n");
+ printf(" - They can be enabled / disabled: the Simulator\n");
+ printf(" will / won't stop when hitting them.\n");
+ printf(" - The Simulator keeps track of how many times they \n");
+ printf(" are met. (See the info command.) Going over a\n");
+ printf(" disabled stop still increases its counter. \n");
+ printf(" Commands:\n");
+ printf(" stop info all/<code> : print infos about number <code>\n");
+ printf(" or all stop(s).\n");
+ printf(" stop enable/disable all/<code> : enables / disables\n");
+ printf(" all or number <code> stop(s)\n");
+ printf(" stop unstop\n");
+ printf(" ignore the stop instruction at the current location\n");
+ printf(" from now on\n");
+ } else {
+ printf("Unknown command: %s\n", cmd);
+ }
+ }
+ }
+
+ // Add all the breakpoints back to stop execution and enter the debugger
+ // shell when hit.
+ redoBreakpoints();
+
+#undef COMMAND_SIZE
+#undef ARG_SIZE
+
+#undef STR
+#undef XSTR
+}
+
+static bool
+AllOnOnePage(uintptr_t start, int size)
+{
+ intptr_t start_page = (start & ~CachePage::kPageMask);
+ intptr_t end_page = ((start + size) & ~CachePage::kPageMask);
+ return start_page == end_page;
+}
+
+void
+Simulator::setLastDebuggerInput(char* input)
+{
+ js_free(lastDebuggerInput_);
+ lastDebuggerInput_ = input;
+}
+
+static CachePage*
+GetCachePageLocked(Simulator::ICacheMap& i_cache, void* page)
+{
+ Simulator::ICacheMap::AddPtr p = i_cache.lookupForAdd(page);
+ if (p)
+ return p->value();
+
+ CachePage* new_page = js_new<CachePage>();
+ if (!i_cache.add(p, page, new_page))
+ return nullptr;
+ return new_page;
+}
+
+// Flush from start up to and not including start + size.
+static void
+FlushOnePageLocked(Simulator::ICacheMap& i_cache, intptr_t start, int size)
+{
+ MOZ_ASSERT(size <= CachePage::kPageSize);
+ MOZ_ASSERT(AllOnOnePage(start, size - 1));
+ MOZ_ASSERT((start & CachePage::kLineMask) == 0);
+ MOZ_ASSERT((size & CachePage::kLineMask) == 0);
+ void* page = reinterpret_cast<void*>(start & (~CachePage::kPageMask));
+ int offset = (start & CachePage::kPageMask);
+ CachePage* cache_page = GetCachePageLocked(i_cache, page);
+ char* valid_bytemap = cache_page->validityByte(offset);
+ memset(valid_bytemap, CachePage::LINE_INVALID, size >> CachePage::kLineShift);
+}
+
+static void
+FlushICacheLocked(Simulator::ICacheMap& i_cache, void* start_addr, size_t size)
+{
+ intptr_t start = reinterpret_cast<intptr_t>(start_addr);
+ int intra_line = (start & CachePage::kLineMask);
+ start -= intra_line;
+ size += intra_line;
+ size = ((size - 1) | CachePage::kLineMask) + 1;
+ int offset = (start & CachePage::kPageMask);
+ while (!AllOnOnePage(start, size - 1)) {
+ int bytes_to_flush = CachePage::kPageSize - offset;
+ FlushOnePageLocked(i_cache, start, bytes_to_flush);
+ start += bytes_to_flush;
+ size -= bytes_to_flush;
+ MOZ_ASSERT((start & CachePage::kPageMask) == 0);
+ offset = 0;
+ }
+ if (size != 0)
+ FlushOnePageLocked(i_cache, start, size);
+}
+
+static void
+CheckICacheLocked(Simulator::ICacheMap& i_cache, SimInstruction* instr)
+{
+ intptr_t address = reinterpret_cast<intptr_t>(instr);
+ void* page = reinterpret_cast<void*>(address & (~CachePage::kPageMask));
+ void* line = reinterpret_cast<void*>(address & (~CachePage::kLineMask));
+ int offset = (address & CachePage::kPageMask);
+ CachePage* cache_page = GetCachePageLocked(i_cache, page);
+ char* cache_valid_byte = cache_page->validityByte(offset);
+ bool cache_hit = (*cache_valid_byte == CachePage::LINE_VALID);
+ char* cached_line = cache_page->cachedData(offset & ~CachePage::kLineMask);
+ if (cache_hit) {
+ // Check that the data in memory matches the contents of the I-cache.
+ MOZ_ASSERT(memcmp(reinterpret_cast<void*>(instr),
+ cache_page->cachedData(offset),
+ SimInstruction::kInstrSize) == 0);
+ } else {
+ // Cache miss. Load memory into the cache.
+ memcpy(cached_line, line, CachePage::kLineLength);
+ *cache_valid_byte = CachePage::LINE_VALID;
+ }
+}
+
+HashNumber
+Simulator::ICacheHasher::hash(const Lookup& l)
+{
+ return U32(reinterpret_cast<uintptr_t>(l)) >> 2;
+}
+
+bool
+Simulator::ICacheHasher::match(const Key& k, const Lookup& l)
+{
+ MOZ_ASSERT((reinterpret_cast<intptr_t>(k) & CachePage::kPageMask) == 0);
+ MOZ_ASSERT((reinterpret_cast<intptr_t>(l) & CachePage::kPageMask) == 0);
+ return k == l;
+}
+
+void
+Simulator::FlushICache(void* start_addr, size_t size)
+{
+ if (Simulator::ICacheCheckingEnabled) {
+ Simulator* sim = Simulator::Current();
+ AutoLockSimulatorCache als(sim);
+ js::jit::FlushICacheLocked(sim->icache(), start_addr, size);
+ }
+}
+
+Simulator::Simulator()
+ : cacheLock_(mutexid::SimulatorCacheLock)
+{
+ // Set up simulator support first. Some of this information is needed to
+ // setup the architecture state.
+
+ // Note, allocation and anything that depends on allocated memory is
+ // deferred until init(), in order to handle OOM properly.
+
+ stack_ = nullptr;
+ stackLimit_ = 0;
+ pc_modified_ = false;
+ icount_ = 0;
+ break_count_ = 0;
+ resume_pc_ = 0;
+ break_pc_ = nullptr;
+ break_instr_ = 0;
+ single_stepping_ = false;
+ single_step_callback_ = nullptr;
+ single_step_callback_arg_ = nullptr;
+
+ // Set up architecture state.
+ // All registers are initialized to zero to start with.
+ for (int i = 0; i < Register::kNumSimuRegisters; i++)
+ registers_[i] = 0;
+ for (int i = 0; i < Simulator::FPURegister::kNumFPURegisters; i++)
+ FPUregisters_[i] = 0;
+ FCSR_ = 0;
+
+ // The ra and pc are initialized to a known bad value that will cause an
+ // access violation if the simulator ever tries to execute it.
+ registers_[pc] = bad_ra;
+ registers_[ra] = bad_ra;
+
+ for (int i = 0; i < kNumExceptions; i++)
+ exceptions[i] = 0;
+
+ lastDebuggerInput_ = nullptr;
+
+ redirection_ = nullptr;
+}
+
+bool
+Simulator::init()
+{
+ if (!icache_.init())
+ return false;
+
+ // Allocate 2MB for the stack. Note that we will only use 1MB, see below.
+ static const size_t stackSize = 2 * 1024 * 1024;
+ stack_ = static_cast<char*>(js_malloc(stackSize));
+ if (!stack_)
+ return false;
+
+ // Leave a safety margin of 1MB to prevent overrunning the stack when
+ // pushing values (total stack size is 2MB).
+ stackLimit_ = reinterpret_cast<uintptr_t>(stack_) + 1024 * 1024;
+
+ // The sp is initialized to point to the bottom (high address) of the
+ // allocated stack area. To be safe in potential stack underflows we leave
+ // some buffer below.
+ registers_[sp] = reinterpret_cast<int64_t>(stack_) + stackSize - 64;
+
+ return true;
+}
+
+// When the generated code calls an external reference we need to catch that in
+// the simulator. The external reference will be a function compiled for the
+// host architecture. We need to call that function instead of trying to
+// execute it with the simulator. We do that by redirecting the external
+// reference to a swi (software-interrupt) instruction that is handled by
+// the simulator. We write the original destination of the jump just at a known
+// offset from the swi instruction so the simulator knows what to call.
+class Redirection
+{
+ friend class Simulator;
+
+ // sim's lock must already be held.
+ Redirection(void* nativeFunction, ABIFunctionType type, Simulator* sim)
+ : nativeFunction_(nativeFunction),
+ swiInstruction_(kCallRedirInstr),
+ type_(type),
+ next_(nullptr)
+ {
+ next_ = sim->redirection();
+ if (Simulator::ICacheCheckingEnabled)
+ FlushICacheLocked(sim->icache(), addressOfSwiInstruction(), SimInstruction::kInstrSize);
+ sim->setRedirection(this);
+ }
+
+ public:
+ void* addressOfSwiInstruction() { return &swiInstruction_; }
+ void* nativeFunction() const { return nativeFunction_; }
+ ABIFunctionType type() const { return type_; }
+
+ static Redirection* Get(void* nativeFunction, ABIFunctionType type) {
+ Simulator* sim = Simulator::Current();
+
+ AutoLockSimulatorCache als(sim);
+
+ Redirection* current = sim->redirection();
+ for (; current != nullptr; current = current->next_) {
+ if (current->nativeFunction_ == nativeFunction) {
+ MOZ_ASSERT(current->type() == type);
+ return current;
+ }
+ }
+
+ Redirection* redir = (Redirection*)js_malloc(sizeof(Redirection));
+ if (!redir) {
+ MOZ_ReportAssertionFailure("[unhandlable oom] Simulator redirection",
+ __FILE__, __LINE__);
+ MOZ_CRASH();
+ }
+ new(redir) Redirection(nativeFunction, type, sim);
+ return redir;
+ }
+
+ static Redirection* FromSwiInstruction(SimInstruction* swiInstruction) {
+ uint8_t* addrOfSwi = reinterpret_cast<uint8_t*>(swiInstruction);
+ uint8_t* addrOfRedirection = addrOfSwi - offsetof(Redirection, swiInstruction_);
+ return reinterpret_cast<Redirection*>(addrOfRedirection);
+ }
+
+ private:
+ void* nativeFunction_;
+ uint32_t swiInstruction_;
+ ABIFunctionType type_;
+ Redirection* next_;
+};
+
+Simulator::~Simulator()
+{
+ js_free(stack_);
+ Redirection* r = redirection_;
+ while (r) {
+ Redirection* next = r->next_;
+ js_delete(r);
+ r = next;
+ }
+}
+
+/* static */ void*
+Simulator::RedirectNativeFunction(void* nativeFunction, ABIFunctionType type)
+{
+ Redirection* redirection = Redirection::Get(nativeFunction, type);
+ return redirection->addressOfSwiInstruction();
+}
+
+// Get the active Simulator for the current thread.
+Simulator*
+Simulator::Current()
+{
+ return TlsPerThreadData.get()->simulator();
+}
+
+// Sets the register in the architecture state. It will also deal with updating
+// Simulator internal state for special registers such as PC.
+void
+Simulator::setRegister(int reg, int64_t value)
+{
+ MOZ_ASSERT((reg >= 0) && (reg < Register::kNumSimuRegisters));
+ if (reg == pc)
+ pc_modified_ = true;
+
+ // Zero register always holds 0.
+ registers_[reg] = (reg == 0) ? 0 : value;
+}
+
+void
+Simulator::setFpuRegister(int fpureg, int64_t value)
+{
+ MOZ_ASSERT((fpureg >= 0) && (fpureg < Simulator::FPURegister::kNumFPURegisters));
+ FPUregisters_[fpureg] = value;
+}
+
+void
+Simulator::setFpuRegisterLo(int fpureg, int32_t value)
+{
+ MOZ_ASSERT((fpureg >= 0) && (fpureg < Simulator::FPURegister::kNumFPURegisters));
+ *mozilla::BitwiseCast<int32_t*>(&FPUregisters_[fpureg]) = value;
+}
+
+void
+Simulator::setFpuRegisterHi(int fpureg, int32_t value)
+{
+ MOZ_ASSERT((fpureg >= 0) && (fpureg < Simulator::FPURegister::kNumFPURegisters));
+ *((mozilla::BitwiseCast<int32_t*>(&FPUregisters_[fpureg])) + 1) = value;
+}
+
+void
+Simulator::setFpuRegisterFloat(int fpureg, float value)
+{
+ MOZ_ASSERT((fpureg >= 0) && (fpureg < Simulator::FPURegister::kNumFPURegisters));
+ *mozilla::BitwiseCast<float*>(&FPUregisters_[fpureg]) = value;
+}
+
+void
+Simulator::setFpuRegisterDouble(int fpureg, double value)
+{
+ MOZ_ASSERT((fpureg >= 0) && (fpureg < Simulator::FPURegister::kNumFPURegisters));
+ *mozilla::BitwiseCast<double*>(&FPUregisters_[fpureg]) = value;
+}
+
+// Get the register from the architecture state. This function does handle
+// the special case of accessing the PC register.
+int64_t
+Simulator::getRegister(int reg) const
+{
+ MOZ_ASSERT((reg >= 0) && (reg < Register::kNumSimuRegisters));
+ if (reg == 0)
+ return 0;
+ return registers_[reg] + ((reg == pc) ? SimInstruction::kPCReadOffset : 0);
+}
+
+int64_t
+Simulator::getFpuRegister(int fpureg) const
+{
+ MOZ_ASSERT((fpureg >= 0) && (fpureg < Simulator::FPURegister::kNumFPURegisters));
+ return FPUregisters_[fpureg];
+}
+
+int32_t
+Simulator::getFpuRegisterLo(int fpureg) const
+{
+ MOZ_ASSERT((fpureg >= 0) && (fpureg < Simulator::FPURegister::kNumFPURegisters));
+ return *mozilla::BitwiseCast<int32_t*>(&FPUregisters_[fpureg]);
+}
+
+int32_t
+Simulator::getFpuRegisterHi(int fpureg) const
+{
+ MOZ_ASSERT((fpureg >= 0) && (fpureg < Simulator::FPURegister::kNumFPURegisters));
+ return *((mozilla::BitwiseCast<int32_t*>(&FPUregisters_[fpureg])) + 1);
+}
+
+float
+Simulator::getFpuRegisterFloat(int fpureg) const
+{
+ MOZ_ASSERT((fpureg >= 0) && (fpureg < Simulator::FPURegister::kNumFPURegisters));
+ return *mozilla::BitwiseCast<float*>(&FPUregisters_[fpureg]);
+}
+
+double
+Simulator::getFpuRegisterDouble(int fpureg) const
+{
+ MOZ_ASSERT((fpureg >= 0) && (fpureg < Simulator::FPURegister::kNumFPURegisters));
+ return *mozilla::BitwiseCast<double*>(&FPUregisters_[fpureg]);
+}
+
+void
+Simulator::setCallResultDouble(double result)
+{
+ setFpuRegisterDouble(f0, result);
+}
+
+void
+Simulator::setCallResultFloat(float result)
+{
+ setFpuRegisterFloat(f0, result);
+}
+
+void
+Simulator::setCallResult(int64_t res)
+{
+ setRegister(v0, res);
+}
+
+void
+Simulator::setCallResult(__int128_t res)
+{
+ setRegister(v0, I64(res));
+ setRegister(v1, I64(res >> 64));
+}
+
+// Helper functions for setting and testing the FCSR register's bits.
+void
+Simulator::setFCSRBit(uint32_t cc, bool value)
+{
+ if (value)
+ FCSR_ |= (1 << cc);
+ else
+ FCSR_ &= ~(1 << cc);
+}
+
+bool
+Simulator::testFCSRBit(uint32_t cc)
+{
+ return FCSR_ & (1 << cc);
+}
+
+// Sets the rounding error codes in FCSR based on the result of the rounding.
+// Returns true if the operation was invalid.
+bool
+Simulator::setFCSRRoundError(double original, double rounded)
+{
+ bool ret = false;
+
+ if (!std::isfinite(original) || !std::isfinite(rounded)) {
+ setFCSRBit(kFCSRInvalidOpFlagBit, true);
+ ret = true;
+ }
+
+ if (original != rounded)
+ setFCSRBit(kFCSRInexactFlagBit, true);
+
+ if (rounded < DBL_MIN && rounded > -DBL_MIN && rounded != 0) {
+ setFCSRBit(kFCSRUnderflowFlagBit, true);
+ ret = true;
+ }
+
+ if (rounded > INT_MAX || rounded < INT_MIN) {
+ setFCSRBit(kFCSROverflowFlagBit, true);
+ // The reference is not really clear but it seems this is required:
+ setFCSRBit(kFCSRInvalidOpFlagBit, true);
+ ret = true;
+ }
+
+ return ret;
+}
+
+// Raw access to the PC register.
+void
+Simulator::set_pc(int64_t value)
+{
+ pc_modified_ = true;
+ registers_[pc] = value;
+}
+
+bool
+Simulator::has_bad_pc() const
+{
+ return ((registers_[pc] == bad_ra) || (registers_[pc] == end_sim_pc));
+}
+
+// Raw access to the PC register without the special adjustment when reading.
+int64_t
+Simulator::get_pc() const
+{
+ return registers_[pc];
+}
+
+// The MIPS cannot do unaligned reads and writes. On some MIPS platforms an
+// interrupt is caused. On others it does a funky rotation thing. For now we
+// simply disallow unaligned reads, but at some point we may want to move to
+// emulating the rotate behaviour. Note that simulator runs have the runtime
+// system running directly on the host system and only generated code is
+// executed in the simulator. Since the host is typically IA32 we will not
+// get the correct MIPS-like behaviour on unaligned accesses.
+
+uint8_t
+Simulator::readBU(uint64_t addr, SimInstruction* instr)
+{
+ uint8_t* ptr = reinterpret_cast<uint8_t*>(addr);
+ return* ptr;
+}
+
+int8_t
+Simulator::readB(uint64_t addr, SimInstruction* instr)
+{
+ int8_t* ptr = reinterpret_cast<int8_t*>(addr);
+ return* ptr;
+}
+
+void
+Simulator::writeB(uint64_t addr, uint8_t value, SimInstruction* instr)
+{
+ uint8_t* ptr = reinterpret_cast<uint8_t*>(addr);
+ *ptr = value;
+}
+
+void
+Simulator::writeB(uint64_t addr, int8_t value, SimInstruction* instr)
+{
+ int8_t* ptr = reinterpret_cast<int8_t*>(addr);
+ *ptr = value;
+}
+
+uint16_t
+Simulator::readHU(uint64_t addr, SimInstruction* instr)
+{
+ if ((addr & 1) == 0) {
+ uint16_t* ptr = reinterpret_cast<uint16_t*>(addr);
+ return *ptr;
+ }
+ printf("Unaligned unsigned halfword read at 0x%016" PRIx64 ", pc=0x%016" PRIxPTR "\n",
+ addr, reinterpret_cast<intptr_t>(instr));
+ MOZ_CRASH();
+ return 0;
+}
+
+int16_t
+Simulator::readH(uint64_t addr, SimInstruction* instr)
+{
+ if ((addr & 1) == 0) {
+ int16_t* ptr = reinterpret_cast<int16_t*>(addr);
+ return *ptr;
+ }
+ printf("Unaligned signed halfword read at 0x%016" PRIx64 ", pc=0x%016" PRIxPTR "\n",
+ addr, reinterpret_cast<intptr_t>(instr));
+ MOZ_CRASH();
+ return 0;
+}
+
+void
+Simulator::writeH(uint64_t addr, uint16_t value, SimInstruction* instr)
+{
+ if ((addr & 1) == 0) {
+ uint16_t* ptr = reinterpret_cast<uint16_t*>(addr);
+ *ptr = value;
+ return;
+ }
+ printf("Unaligned unsigned halfword write at 0x%016" PRIx64 ", pc=0x%016" PRIxPTR "\n",
+ addr, reinterpret_cast<intptr_t>(instr));
+ MOZ_CRASH();
+}
+
+void
+Simulator::writeH(uint64_t addr, int16_t value, SimInstruction* instr)
+{
+ if ((addr & 1) == 0) {
+ int16_t* ptr = reinterpret_cast<int16_t*>(addr);
+ *ptr = value;
+ return;
+ }
+ printf("Unaligned halfword write at 0x%016" PRIx64 ", pc=0x%016" PRIxPTR "\n",
+ addr, reinterpret_cast<intptr_t>(instr));
+ MOZ_CRASH();
+}
+
+uint32_t
+Simulator::readWU(uint64_t addr, SimInstruction* instr)
+{
+ if (addr < 0x400) {
+ // This has to be a NULL-dereference, drop into debugger.
+ printf("Memory read from bad address: 0x%016" PRIx64 ", pc=0x%016" PRIxPTR "\n",
+ addr, reinterpret_cast<intptr_t>(instr));
+ MOZ_CRASH();
+ }
+ if ((addr & 3) == 0) {
+ uint32_t* ptr = reinterpret_cast<uint32_t*>(addr);
+ return *ptr;
+ }
+ printf("Unaligned read at 0x%016" PRIx64 ", pc=0x%016" PRIxPTR "\n",
+ addr, reinterpret_cast<intptr_t>(instr));
+ MOZ_CRASH();
+ return 0;
+}
+
+int32_t
+Simulator::readW(uint64_t addr, SimInstruction* instr)
+{
+ if (addr < 0x400) {
+ // This has to be a NULL-dereference, drop into debugger.
+ printf("Memory read from bad address: 0x%016" PRIx64 ", pc=0x%016" PRIxPTR "\n",
+ addr, reinterpret_cast<intptr_t>(instr));
+ MOZ_CRASH();
+ }
+ if ((addr & 3) == 0) {
+ int32_t* ptr = reinterpret_cast<int32_t*>(addr);
+ return *ptr;
+ }
+ printf("Unaligned read at 0x%016" PRIx64 ", pc=0x%016" PRIxPTR "\n",
+ addr, reinterpret_cast<intptr_t>(instr));
+ MOZ_CRASH();
+ return 0;
+}
+
+void
+Simulator::writeW(uint64_t addr, uint32_t value, SimInstruction* instr)
+{
+ if (addr < 0x400) {
+ // This has to be a NULL-dereference, drop into debugger.
+ printf("Memory write to bad address: 0x%016" PRIx64 ", pc=0x%016" PRIxPTR "\n",
+ addr, reinterpret_cast<intptr_t>(instr));
+ MOZ_CRASH();
+ }
+ if ((addr & 3) == 0) {
+ uint32_t* ptr = reinterpret_cast<uint32_t*>(addr);
+ *ptr = value;
+ return;
+ }
+ printf("Unaligned write at 0x%016" PRIx64 ", pc=0x%016" PRIxPTR "\n",
+ addr, reinterpret_cast<intptr_t>(instr));
+ MOZ_CRASH();
+}
+
+void
+Simulator::writeW(uint64_t addr, int32_t value, SimInstruction* instr)
+{
+ if (addr < 0x400) {
+ // This has to be a NULL-dereference, drop into debugger.
+ printf("Memory write to bad address: 0x%016" PRIx64 ", pc=0x%016" PRIxPTR "\n",
+ addr, reinterpret_cast<intptr_t>(instr));
+ MOZ_CRASH();
+ }
+ if ((addr & 3) == 0) {
+ int32_t* ptr = reinterpret_cast<int32_t*>(addr);
+ *ptr = value;
+ return;
+ }
+ printf("Unaligned write at 0x%016" PRIx64 ", pc=0x%016" PRIxPTR "\n",
+ addr, reinterpret_cast<intptr_t>(instr));
+ MOZ_CRASH();
+}
+
+int64_t
+Simulator::readDW(uint64_t addr, SimInstruction* instr)
+{
+ if (addr < 0x400) {
+ // This has to be a NULL-dereference, drop into debugger.
+ printf("Memory read from bad address: 0x%016" PRIx64 ", pc=0x%016" PRIxPTR "\n",
+ addr, reinterpret_cast<intptr_t>(instr));
+ MOZ_CRASH();
+ }
+ if ((addr & kPointerAlignmentMask) == 0) {
+ int64_t* ptr = reinterpret_cast<int64_t*>(addr);
+ return* ptr;
+ }
+ printf("Unaligned read at 0x%016" PRIx64 ", pc=0x%016" PRIxPTR "\n",
+ addr, reinterpret_cast<intptr_t>(instr));
+ MOZ_CRASH();
+ return 0;
+}
+
+void
+Simulator::writeDW(uint64_t addr, int64_t value, SimInstruction* instr)
+{
+ if (addr < 0x400) {
+ // This has to be a NULL-dereference, drop into debugger.
+ printf("Memory write to bad address: 0x%016" PRIx64 ", pc=0x%016" PRIxPTR "\n",
+ addr, reinterpret_cast<intptr_t>(instr));
+ MOZ_CRASH();
+ }
+ if ((addr & kPointerAlignmentMask) == 0) {
+ int64_t* ptr = reinterpret_cast<int64_t*>(addr);
+ *ptr = value;
+ return;
+ }
+ printf("Unaligned write at 0x%016" PRIx64 ", pc=0x%016" PRIxPTR "\n",
+ addr, reinterpret_cast<intptr_t>(instr));
+ MOZ_CRASH();
+}
+
+double
+Simulator::readD(uint64_t addr, SimInstruction* instr)
+{
+ if ((addr & kDoubleAlignmentMask) == 0) {
+ double* ptr = reinterpret_cast<double*>(addr);
+ return *ptr;
+ }
+ printf("Unaligned (double) read at 0x%016" PRIx64 ", pc=0x%016" PRIxPTR "\n",
+ addr, reinterpret_cast<intptr_t>(instr));
+ MOZ_CRASH();
+ return 0;
+}
+
+void
+Simulator::writeD(uint64_t addr, double value, SimInstruction* instr)
+{
+ if ((addr & kDoubleAlignmentMask) == 0) {
+ double* ptr = reinterpret_cast<double*>(addr);
+ *ptr = value;
+ return;
+ }
+ printf("Unaligned (double) write at 0x%016" PRIx64 ", pc=0x%016" PRIxPTR "\n",
+ addr, reinterpret_cast<intptr_t>(instr));
+ MOZ_CRASH();
+}
+
+uintptr_t
+Simulator::stackLimit() const
+{
+ return stackLimit_;
+}
+
+uintptr_t*
+Simulator::addressOfStackLimit()
+{
+ return &stackLimit_;
+}
+
+bool
+Simulator::overRecursed(uintptr_t newsp) const
+{
+ if (newsp == 0)
+ newsp = getRegister(sp);
+ return newsp <= stackLimit();
+}
+
+bool
+Simulator::overRecursedWithExtra(uint32_t extra) const
+{
+ uintptr_t newsp = getRegister(sp) - extra;
+ return newsp <= stackLimit();
+}
+
+// Unsupported instructions use format to print an error and stop execution.
+void
+Simulator::format(SimInstruction* instr, const char* format)
+{
+ printf("Simulator found unsupported instruction:\n 0x%016lx: %s\n",
+ reinterpret_cast<intptr_t>(instr), format);
+ MOZ_CRASH();
+}
+
+// Note: With the code below we assume that all runtime calls return a 64 bits
+// result. If they don't, the v1 result register contains a bogus value, which
+// is fine because it is caller-saved.
+typedef int64_t (*Prototype_General0)();
+typedef int64_t (*Prototype_General1)(int64_t arg0);
+typedef int64_t (*Prototype_General2)(int64_t arg0, int64_t arg1);
+typedef int64_t (*Prototype_General3)(int64_t arg0, int64_t arg1, int64_t arg2);
+typedef int64_t (*Prototype_General4)(int64_t arg0, int64_t arg1, int64_t arg2, int64_t arg3);
+typedef int64_t (*Prototype_General5)(int64_t arg0, int64_t arg1, int64_t arg2, int64_t arg3,
+ int64_t arg4);
+typedef int64_t (*Prototype_General6)(int64_t arg0, int64_t arg1, int64_t arg2, int64_t arg3,
+ int64_t arg4, int64_t arg5);
+typedef int64_t (*Prototype_General7)(int64_t arg0, int64_t arg1, int64_t arg2, int64_t arg3,
+ int64_t arg4, int64_t arg5, int64_t arg6);
+typedef int64_t (*Prototype_General8)(int64_t arg0, int64_t arg1, int64_t arg2, int64_t arg3,
+ int64_t arg4, int64_t arg5, int64_t arg6, int64_t arg7);
+
+typedef double (*Prototype_Double_None)();
+typedef double (*Prototype_Double_Double)(double arg0);
+typedef double (*Prototype_Double_Int)(int64_t arg0);
+typedef int64_t (*Prototype_Int_Double)(double arg0);
+typedef int64_t (*Prototype_Int_DoubleIntInt)(double arg0, int64_t arg1, int64_t arg2);
+typedef int64_t (*Prototype_Int_IntDoubleIntInt)(int64_t arg0, double arg1, int64_t arg2,
+ int64_t arg3);
+typedef float (*Prototype_Float32_Float32)(float arg0);
+
+typedef double (*Prototype_DoubleInt)(double arg0, int64_t arg1);
+typedef double (*Prototype_Double_IntDouble)(int64_t arg0, double arg1);
+typedef double (*Prototype_Double_DoubleDouble)(double arg0, double arg1);
+typedef int64_t (*Prototype_Int_IntDouble)(int64_t arg0, double arg1);
+
+typedef double (*Prototype_Double_DoubleDoubleDouble)(double arg0, double arg1, double arg2);
+typedef double (*Prototype_Double_DoubleDoubleDoubleDouble)(double arg0, double arg1,
+ double arg2, double arg3);
+
+// Software interrupt instructions are used by the simulator to call into C++.
+void
+Simulator::softwareInterrupt(SimInstruction* instr)
+{
+ int32_t func = instr->functionFieldRaw();
+ uint32_t code = (func == ff_break) ? instr->bits(25, 6) : -1;
+
+ // We first check if we met a call_rt_redirected.
+ if (instr->instructionBits() == kCallRedirInstr) {
+#if !defined(USES_N64_ABI)
+ MOZ_CRASH("Only N64 ABI supported.");
+#else
+ Redirection* redirection = Redirection::FromSwiInstruction(instr);
+ int64_t arg0 = getRegister(a0);
+ int64_t arg1 = getRegister(a1);
+ int64_t arg2 = getRegister(a2);
+ int64_t arg3 = getRegister(a3);
+ int64_t arg4 = getRegister(a4);
+ int64_t arg5 = getRegister(a5);
+
+ // This is dodgy but it works because the C entry stubs are never moved.
+ // See comment in codegen-arm.cc and bug 1242173.
+ int64_t saved_ra = getRegister(ra);
+
+ intptr_t external = reinterpret_cast<intptr_t>(redirection->nativeFunction());
+
+ bool stack_aligned = (getRegister(sp) & (ABIStackAlignment - 1)) == 0;
+ if (!stack_aligned) {
+ fprintf(stderr, "Runtime call with unaligned stack!\n");
+ MOZ_CRASH();
+ }
+
+ if (single_stepping_)
+ single_step_callback_(single_step_callback_arg_, this, nullptr);
+
+ switch (redirection->type()) {
+ case Args_General0: {
+ Prototype_General0 target = reinterpret_cast<Prototype_General0>(external);
+ int64_t result = target();
+ setCallResult(result);
+ break;
+ }
+ case Args_General1: {
+ Prototype_General1 target = reinterpret_cast<Prototype_General1>(external);
+ int64_t result = target(arg0);
+ setCallResult(result);
+ break;
+ }
+ case Args_General2: {
+ Prototype_General2 target = reinterpret_cast<Prototype_General2>(external);
+ int64_t result = target(arg0, arg1);
+ setCallResult(result);
+ break;
+ }
+ case Args_General3: {
+ Prototype_General3 target = reinterpret_cast<Prototype_General3>(external);
+ int64_t result = target(arg0, arg1, arg2);
+ setCallResult(result);
+ break;
+ }
+ case Args_General4: {
+ Prototype_General4 target = reinterpret_cast<Prototype_General4>(external);
+ int64_t result = target(arg0, arg1, arg2, arg3);
+ setCallResult(result);
+ break;
+ }
+ case Args_General5: {
+ Prototype_General5 target = reinterpret_cast<Prototype_General5>(external);
+ int64_t result = target(arg0, arg1, arg2, arg3, arg4);
+ setCallResult(result);
+ break;
+ }
+ case Args_General6: {
+ Prototype_General6 target = reinterpret_cast<Prototype_General6>(external);
+ int64_t result = target(arg0, arg1, arg2, arg3, arg4, arg5);
+ setCallResult(result);
+ break;
+ }
+ case Args_General7: {
+ Prototype_General7 target = reinterpret_cast<Prototype_General7>(external);
+ int64_t arg6 = getRegister(a6);
+ int64_t result = target(arg0, arg1, arg2, arg3, arg4, arg5, arg6);
+ setCallResult(result);
+ break;
+ }
+ case Args_General8: {
+ Prototype_General8 target = reinterpret_cast<Prototype_General8>(external);
+ int64_t arg6 = getRegister(a6);
+ int64_t arg7 = getRegister(a7);
+ int64_t result = target(arg0, arg1, arg2, arg3, arg4, arg5, arg6, arg7);
+ setCallResult(result);
+ break;
+ }
+ case Args_Double_None: {
+ Prototype_Double_None target = reinterpret_cast<Prototype_Double_None>(external);
+ double dresult = target();
+ setCallResultDouble(dresult);
+ break;
+ }
+ case Args_Int_Double: {
+ double dval0 = getFpuRegisterDouble(12);
+ Prototype_Int_Double target = reinterpret_cast<Prototype_Int_Double>(external);
+ int64_t res = target(dval0);
+ setRegister(v0, res);
+ break;
+ }
+ case Args_Int_DoubleIntInt: {
+ double dval = getFpuRegisterDouble(12);
+ Prototype_Int_DoubleIntInt target = reinterpret_cast<Prototype_Int_DoubleIntInt>(external);
+ int64_t res = target(dval, arg1, arg2);
+ setRegister(v0, res);
+ break;
+ }
+ case Args_Int_IntDoubleIntInt: {
+ double dval = getFpuRegisterDouble(13);
+ Prototype_Int_IntDoubleIntInt target = reinterpret_cast<Prototype_Int_IntDoubleIntInt>(external);
+ int64_t res = target(arg0, dval, arg2, arg3);
+ setRegister(v0, res);
+ break;
+ }
+ case Args_Double_Double: {
+ double dval0 = getFpuRegisterDouble(12);
+ Prototype_Double_Double target = reinterpret_cast<Prototype_Double_Double>(external);
+ double dresult = target(dval0);
+ setCallResultDouble(dresult);
+ break;
+ }
+ case Args_Float32_Float32: {
+ float fval0;
+ fval0 = getFpuRegisterFloat(12);
+ Prototype_Float32_Float32 target = reinterpret_cast<Prototype_Float32_Float32>(external);
+ float fresult = target(fval0);
+ setCallResultFloat(fresult);
+ break;
+ }
+ case Args_Double_Int: {
+ Prototype_Double_Int target = reinterpret_cast<Prototype_Double_Int>(external);
+ double dresult = target(arg0);
+ setCallResultDouble(dresult);
+ break;
+ }
+ case Args_Double_DoubleInt: {
+ double dval0 = getFpuRegisterDouble(12);
+ Prototype_DoubleInt target = reinterpret_cast<Prototype_DoubleInt>(external);
+ double dresult = target(dval0, arg1);
+ setCallResultDouble(dresult);
+ break;
+ }
+ case Args_Double_DoubleDouble: {
+ double dval0 = getFpuRegisterDouble(12);
+ double dval1 = getFpuRegisterDouble(13);
+ Prototype_Double_DoubleDouble target = reinterpret_cast<Prototype_Double_DoubleDouble>(external);
+ double dresult = target(dval0, dval1);
+ setCallResultDouble(dresult);
+ break;
+ }
+ case Args_Double_IntDouble: {
+ double dval1 = getFpuRegisterDouble(13);
+ Prototype_Double_IntDouble target = reinterpret_cast<Prototype_Double_IntDouble>(external);
+ double dresult = target(arg0, dval1);
+ setCallResultDouble(dresult);
+ break;
+ }
+ case Args_Int_IntDouble: {
+ double dval1 = getFpuRegisterDouble(13);
+ Prototype_Int_IntDouble target = reinterpret_cast<Prototype_Int_IntDouble>(external);
+ int64_t result = target(arg0, dval1);
+ setRegister(v0, result);
+ break;
+ }
+ case Args_Double_DoubleDoubleDouble: {
+ double dval0 = getFpuRegisterDouble(12);
+ double dval1 = getFpuRegisterDouble(13);
+ double dval2 = getFpuRegisterDouble(14);
+ Prototype_Double_DoubleDoubleDouble target =
+ reinterpret_cast<Prototype_Double_DoubleDoubleDouble>(external);
+ double dresult = target(dval0, dval1, dval2);
+ setCallResultDouble(dresult);
+ break;
+ }
+ case Args_Double_DoubleDoubleDoubleDouble: {
+ double dval0 = getFpuRegisterDouble(12);
+ double dval1 = getFpuRegisterDouble(13);
+ double dval2 = getFpuRegisterDouble(14);
+ double dval3 = getFpuRegisterDouble(15);
+ Prototype_Double_DoubleDoubleDoubleDouble target =
+ reinterpret_cast<Prototype_Double_DoubleDoubleDoubleDouble>(external);
+ double dresult = target(dval0, dval1, dval2, dval3);
+ setCallResultDouble(dresult);
+ break;
+ }
+ default:
+ MOZ_CRASH("call");
+ }
+
+ if (single_stepping_)
+ single_step_callback_(single_step_callback_arg_, this, nullptr);
+
+ setRegister(ra, saved_ra);
+ set_pc(getRegister(ra));
+#endif
+ } else if (func == ff_break && code <= kMaxStopCode) {
+ if (isWatchpoint(code)) {
+ printWatchpoint(code);
+ } else {
+ increaseStopCounter(code);
+ handleStop(code, instr);
+ }
+ } else {
+ // All remaining break_ codes, and all traps are handled here.
+ MipsDebugger dbg(this);
+ dbg.debug();
+ }
+}
+
+// Stop helper functions.
+bool
+Simulator::isWatchpoint(uint32_t code)
+{
+ return (code <= kMaxWatchpointCode);
+}
+
+void
+Simulator::printWatchpoint(uint32_t code)
+{
+ MipsDebugger dbg(this);
+ ++break_count_;
+ printf("\n---- break %d marker: %20" PRIi64 " (instr count: %20" PRIi64 ") ----\n",
+ code, break_count_, icount_);
+ dbg.printAllRegs(); // Print registers and continue running.
+}
+
+void
+Simulator::handleStop(uint32_t code, SimInstruction* instr)
+{
+ // Stop if it is enabled, otherwise go on jumping over the stop
+ // and the message address.
+ if (isEnabledStop(code)) {
+ MipsDebugger dbg(this);
+ dbg.stop(instr);
+ } else {
+ set_pc(get_pc() + 2 * SimInstruction::kInstrSize);
+ }
+}
+
+bool
+Simulator::isStopInstruction(SimInstruction* instr)
+{
+ int32_t func = instr->functionFieldRaw();
+ uint32_t code = U32(instr->bits(25, 6));
+ return (func == ff_break) && code > kMaxWatchpointCode && code <= kMaxStopCode;
+}
+
+bool
+Simulator::isEnabledStop(uint32_t code)
+{
+ MOZ_ASSERT(code <= kMaxStopCode);
+ MOZ_ASSERT(code > kMaxWatchpointCode);
+ return !(watchedStops_[code].count_ & kStopDisabledBit);
+}
+
+void
+Simulator::enableStop(uint32_t code)
+{
+ if (!isEnabledStop(code))
+ watchedStops_[code].count_ &= ~kStopDisabledBit;
+}
+
+void
+Simulator::disableStop(uint32_t code)
+{
+ if (isEnabledStop(code))
+ watchedStops_[code].count_ |= kStopDisabledBit;
+}
+
+void
+Simulator::increaseStopCounter(uint32_t code)
+{
+ MOZ_ASSERT(code <= kMaxStopCode);
+ if ((watchedStops_[code].count_ & ~(1 << 31)) == 0x7fffffff) {
+ printf("Stop counter for code %i has overflowed.\n"
+ "Enabling this code and reseting the counter to 0.\n", code);
+ watchedStops_[code].count_ = 0;
+ enableStop(code);
+ } else {
+ watchedStops_[code].count_++;
+ }
+}
+
+// Print a stop status.
+void
+Simulator::printStopInfo(uint32_t code)
+{
+ if (code <= kMaxWatchpointCode) {
+ printf("That is a watchpoint, not a stop.\n");
+ return;
+ } else if (code > kMaxStopCode) {
+ printf("Code too large, only %u stops can be used\n", kMaxStopCode + 1);
+ return;
+ }
+ const char* state = isEnabledStop(code) ? "Enabled" : "Disabled";
+ int32_t count = watchedStops_[code].count_ & ~kStopDisabledBit;
+ // Don't print the state of unused breakpoints.
+ if (count != 0) {
+ if (watchedStops_[code].desc_) {
+ printf("stop %i - 0x%x: \t%s, \tcounter = %i, \t%s\n",
+ code, code, state, count, watchedStops_[code].desc_);
+ } else {
+ printf("stop %i - 0x%x: \t%s, \tcounter = %i\n",
+ code, code, state, count);
+ }
+ }
+}
+
+void
+Simulator::signalExceptions()
+{
+ for (int i = 1; i < kNumExceptions; i++) {
+ if (exceptions[i] != 0)
+ MOZ_CRASH("Error: Exception raised.");
+ }
+}
+
+// Helper function for decodeTypeRegister.
+void
+Simulator::configureTypeRegister(SimInstruction* instr,
+ int64_t& alu_out,
+ __int128& i128hilo,
+ unsigned __int128& u128hilo,
+ int64_t& next_pc,
+ int32_t& return_addr_reg,
+ bool& do_interrupt)
+{
+ // Every local variable declared here needs to be const.
+ // This is to make sure that changed values are sent back to
+ // decodeTypeRegister correctly.
+
+ // Instruction fields.
+ const Opcode op = instr->opcodeFieldRaw();
+ const int32_t rs_reg = instr->rsValue();
+ const int64_t rs = getRegister(rs_reg);
+ const int32_t rt_reg = instr->rtValue();
+ const int64_t rt = getRegister(rt_reg);
+ const int32_t rd_reg = instr->rdValue();
+ const uint32_t sa = instr->saValue();
+
+ const int32_t fs_reg = instr->fsValue();
+ __int128 temp;
+
+
+ // ---------- Configuration.
+ switch (op) {
+ case op_cop1: // Coprocessor instructions.
+ switch (instr->rsFieldRaw()) {
+ case rs_bc1: // Handled in DecodeTypeImmed, should never come here.
+ MOZ_CRASH();
+ break;
+ case rs_cfc1:
+ // At the moment only FCSR is supported.
+ MOZ_ASSERT(fs_reg == kFCSRRegister);
+ alu_out = FCSR_;
+ break;
+ case rs_mfc1:
+ alu_out = getFpuRegisterLo(fs_reg);
+ break;
+ case rs_dmfc1:
+ alu_out = getFpuRegister(fs_reg);
+ break;
+ case rs_mfhc1:
+ alu_out = getFpuRegisterHi(fs_reg);
+ break;
+ case rs_ctc1:
+ case rs_mtc1:
+ case rs_dmtc1:
+ case rs_mthc1:
+ // Do the store in the execution step.
+ break;
+ case rs_s:
+ case rs_d:
+ case rs_w:
+ case rs_l:
+ case rs_ps:
+ // Do everything in the execution step.
+ break;
+ default:
+ MOZ_CRASH();
+ };
+ break;
+ case op_cop1x:
+ break;
+ case op_special:
+ switch (instr->functionFieldRaw()) {
+ case ff_jr:
+ case ff_jalr:
+ next_pc = getRegister(instr->rsValue());
+ return_addr_reg = instr->rdValue();
+ break;
+ case ff_sll:
+ alu_out = I32(rt) << sa;
+ break;
+ case ff_dsll:
+ alu_out = rt << sa;
+ break;
+ case ff_dsll32:
+ alu_out = rt << (sa + 32);
+ break;
+ case ff_srl:
+ if (rs_reg == 0) {
+ // Regular logical right shift of a word by a fixed number of
+ // bits instruction. RS field is always equal to 0.
+ alu_out = I32(U32(rt) >> sa);
+ } else {
+ // Logical right-rotate of a word by a fixed number of bits. This
+ // is special case of SRL instruction, added in MIPS32 Release 2.
+ // RS field is equal to 00001.
+ alu_out = I32((U32(rt) >> sa) | (U32(rt) << (32 - sa)));
+ }
+ break;
+ case ff_dsrl:
+ if (rs_reg == 0) {
+ // Regular logical right shift of a double word by a fixed number of
+ // bits instruction. RS field is always equal to 0.
+ alu_out = U64(rt) >> sa;
+ } else {
+ // Logical right-rotate of a word by a fixed number of bits. This
+ // is special case of DSRL instruction, added in MIPS64 Release 2.
+ // RS field is equal to 00001.
+ alu_out = (U64(rt) >> sa) | (U64(rt) << (64 - sa));
+ }
+ break;
+ case ff_dsrl32:
+ if (rs_reg == 0) {
+ // Regular logical right shift of a double word by a fixed number of
+ // bits instruction. RS field is always equal to 0.
+ alu_out = U64(rt) >> (sa + 32);
+ } else {
+ // Logical right-rotate of a double word by a fixed number of bits. This
+ // is special case of DSRL instruction, added in MIPS64 Release 2.
+ // RS field is equal to 00001.
+ alu_out = (U64(rt) >> (sa + 32)) | (U64(rt) << (64 - (sa + 32)));
+ }
+ break;
+ case ff_sra:
+ alu_out = I32(rt) >> sa;
+ break;
+ case ff_dsra:
+ alu_out = rt >> sa;
+ break;
+ case ff_dsra32:
+ alu_out = rt >> (sa + 32);
+ break;
+ case ff_sllv:
+ alu_out = I32(rt) << rs;
+ break;
+ case ff_dsllv:
+ alu_out = rt << rs;
+ break;
+ case ff_srlv:
+ if (sa == 0) {
+ // Regular logical right-shift of a word by a variable number of
+ // bits instruction. SA field is always equal to 0.
+ alu_out = I32(U32(rt) >> rs);
+ } else {
+ // Logical right-rotate of a word by a variable number of bits.
+ // This is special case od SRLV instruction, added in MIPS32
+ // Release 2. SA field is equal to 00001.
+ alu_out = I32((U32(rt) >> rs) | (U32(rt) << (32 - rs)));
+ }
+ break;
+ case ff_dsrlv:
+ if (sa == 0) {
+ // Regular logical right-shift of a double word by a variable number of
+ // bits instruction. SA field is always equal to 0.
+ alu_out = U64(rt) >> rs;
+ } else {
+ // Logical right-rotate of a double word by a variable number of bits.
+ // This is special case od DSRLV instruction, added in MIPS64
+ // Release 2. SA field is equal to 00001.
+ alu_out = (U64(rt) >> rs) | (U64(rt) << (64 - rs));
+ }
+ break;
+ case ff_srav:
+ alu_out = I32(rt) >> rs;
+ break;
+ case ff_dsrav:
+ alu_out = rt >> rs;
+ break;
+ case ff_mfhi:
+ alu_out = getRegister(HI);
+ break;
+ case ff_mflo:
+ alu_out = getRegister(LO);
+ break;
+ case ff_mult:
+ i128hilo = I32(rs) * I32(rt);
+ break;
+ case ff_dmult:
+ i128hilo = I128(rs) * I128(rt);
+ break;
+ case ff_multu:
+ u128hilo = U32(rs) * U32(rt);
+ break;
+ case ff_dmultu:
+ u128hilo = U128(rs) * U128(rt);
+ break;
+ case ff_add:
+ alu_out = I32(rs) + I32(rt);
+ if ((alu_out << 32) != (alu_out << 31))
+ exceptions[kIntegerOverflow] = 1;
+ alu_out = I32(alu_out);
+ break;
+ case ff_dadd:
+ temp = I128(rs) + I128(rt);
+ if ((temp << 64) != (temp << 63))
+ exceptions[kIntegerOverflow] = 1;
+ alu_out = I64(temp);
+ break;
+ case ff_addu:
+ alu_out = I32(U32(rs) + U32(rt));
+ break;
+ case ff_daddu:
+ alu_out = rs + rt;
+ break;
+ case ff_sub:
+ alu_out = I32(rs) - I32(rt);
+ if ((alu_out << 32) != (alu_out << 31))
+ exceptions[kIntegerUnderflow] = 1;
+ alu_out = I32(alu_out);
+ break;
+ case ff_dsub:
+ temp = I128(rs) - I128(rt);
+ if ((temp << 64) != (temp << 63))
+ exceptions[kIntegerUnderflow] = 1;
+ alu_out = I64(temp);
+ break;
+ case ff_subu:
+ alu_out = I32(U32(rs) - U32(rt));
+ break;
+ case ff_dsubu:
+ alu_out = rs - rt;
+ break;
+ case ff_and:
+ alu_out = rs & rt;
+ break;
+ case ff_or:
+ alu_out = rs | rt;
+ break;
+ case ff_xor:
+ alu_out = rs ^ rt;
+ break;
+ case ff_nor:
+ alu_out = ~(rs | rt);
+ break;
+ case ff_slt:
+ alu_out = rs < rt ? 1 : 0;
+ break;
+ case ff_sltu:
+ alu_out = U64(rs) < U64(rt) ? 1 : 0;
+ break;
+ case ff_sync:
+ break;
+ // Break and trap instructions.
+ case ff_break:
+ do_interrupt = true;
+ break;
+ case ff_tge:
+ do_interrupt = rs >= rt;
+ break;
+ case ff_tgeu:
+ do_interrupt = U64(rs) >= U64(rt);
+ break;
+ case ff_tlt:
+ do_interrupt = rs < rt;
+ break;
+ case ff_tltu:
+ do_interrupt = U64(rs) < U64(rt);
+ break;
+ case ff_teq:
+ do_interrupt = rs == rt;
+ break;
+ case ff_tne:
+ do_interrupt = rs != rt;
+ break;
+ case ff_movn:
+ case ff_movz:
+ case ff_movci:
+ // No action taken on decode.
+ break;
+ case ff_div:
+ if (I32(rs) == INT_MIN && I32(rt) == -1) {
+ i128hilo = U32(INT_MIN);
+ } else {
+ uint32_t div = I32(rs) / I32(rt);
+ uint32_t mod = I32(rs) % I32(rt);
+ i128hilo = (I64(mod) << 32) | div;
+ }
+ break;
+ case ff_ddiv:
+ if (I32(rs) == INT_MIN && I32(rt) == -1) {
+ i128hilo = U64(INT64_MIN);
+ } else {
+ uint64_t div = rs / rt;
+ uint64_t mod = rs % rt;
+ i128hilo = (I128(mod) << 64) | div;
+ }
+ break;
+ case ff_divu: {
+ uint32_t div = U32(rs) / U32(rt);
+ uint32_t mod = U32(rs) % U32(rt);
+ i128hilo = (U64(mod) << 32) | div;
+ }
+ break;
+ case ff_ddivu:
+ if (0 == rt) {
+ i128hilo = (I128(Unpredictable) << 64) | I64(Unpredictable);
+ } else {
+ uint64_t div = U64(rs) / U64(rt);
+ uint64_t mod = U64(rs) % U64(rt);
+ i128hilo = (I128(mod) << 64) | div;
+ }
+ break;
+ default:
+ MOZ_CRASH();
+ };
+ break;
+ case op_special2:
+ switch (instr->functionFieldRaw()) {
+ case ff_mul:
+ alu_out = I32(I32(rs) * I32(rt)); // Only the lower 32 bits are kept.
+ break;
+ case ff_clz:
+ alu_out = U32(rs) ? __builtin_clz(U32(rs)) : 32;
+ break;
+ case ff_dclz:
+ alu_out = U64(rs) ? __builtin_clzl(U64(rs)) : 64;
+ break;
+ default:
+ MOZ_CRASH();
+ };
+ break;
+ case op_special3:
+ switch (instr->functionFieldRaw()) {
+ case ff_ins: { // Mips64r2 instruction.
+ // Interpret rd field as 5-bit msb of insert.
+ uint16_t msb = rd_reg;
+ // Interpret sa field as 5-bit lsb of insert.
+ uint16_t lsb = sa;
+ uint16_t size = msb - lsb + 1;
+ uint32_t mask = (1 << size) - 1;
+ if (lsb > msb)
+ alu_out = Unpredictable;
+ else
+ alu_out = (U32(rt) & ~(mask << lsb)) | ((U32(rs) & mask) << lsb);
+ break;
+ }
+ case ff_dins: { // Mips64r2 instruction.
+ // Interpret rd field as 5-bit msb of insert.
+ uint16_t msb = rd_reg;
+ // Interpret sa field as 5-bit lsb of insert.
+ uint16_t lsb = sa;
+ uint16_t size = msb - lsb + 1;
+ uint64_t mask = (1ul << size) - 1;
+ if (lsb > msb)
+ alu_out = Unpredictable;
+ else
+ alu_out = (U64(rt) & ~(mask << lsb)) | ((U64(rs) & mask) << lsb);
+ break;
+ }
+ case ff_dinsm: { // Mips64r2 instruction.
+ // Interpret rd field as 5-bit msb of insert.
+ uint16_t msb = rd_reg;
+ // Interpret sa field as 5-bit lsb of insert.
+ uint16_t lsb = sa;
+ uint16_t size = msb - lsb + 33;
+ uint64_t mask = (1ul << size) - 1;
+ alu_out = (U64(rt) & ~(mask << lsb)) | ((U64(rs) & mask) << lsb);
+ break;
+ }
+ case ff_dinsu: { // Mips64r2 instruction.
+ // Interpret rd field as 5-bit msb of insert.
+ uint16_t msb = rd_reg;
+ // Interpret sa field as 5-bit lsb of insert.
+ uint16_t lsb = sa + 32;
+ uint16_t size = msb - lsb + 33;
+ uint64_t mask = (1ul << size) - 1;
+ if (sa > msb)
+ alu_out = Unpredictable;
+ else
+ alu_out = (U64(rt) & ~(mask << lsb)) | ((U64(rs) & mask) << lsb);
+ break;
+ }
+ case ff_ext: { // Mips64r2 instruction.
+ // Interpret rd field as 5-bit msb of extract.
+ uint16_t msb = rd_reg;
+ // Interpret sa field as 5-bit lsb of extract.
+ uint16_t lsb = sa;
+ uint16_t size = msb + 1;
+ uint32_t mask = (1 << size) - 1;
+ if ((lsb + msb) > 31)
+ alu_out = Unpredictable;
+ else
+ alu_out = (U32(rs) & (mask << lsb)) >> lsb;
+ break;
+ }
+ case ff_dext: { // Mips64r2 instruction.
+ // Interpret rd field as 5-bit msb of extract.
+ uint16_t msb = rd_reg;
+ // Interpret sa field as 5-bit lsb of extract.
+ uint16_t lsb = sa;
+ uint16_t size = msb + 1;
+ uint64_t mask = (1ul << size) - 1;
+ alu_out = (U64(rs) & (mask << lsb)) >> lsb;
+ break;
+ }
+ case ff_dextm: { // Mips64r2 instruction.
+ // Interpret rd field as 5-bit msb of extract.
+ uint16_t msb = rd_reg;
+ // Interpret sa field as 5-bit lsb of extract.
+ uint16_t lsb = sa;
+ uint16_t size = msb + 33;
+ uint64_t mask = (1ul << size) - 1;
+ if ((lsb + msb + 32 + 1) > 64)
+ alu_out = Unpredictable;
+ else
+ alu_out = (U64(rs) & (mask << lsb)) >> lsb;
+ break;
+ }
+ case ff_dextu: { // Mips64r2 instruction.
+ // Interpret rd field as 5-bit msb of extract.
+ uint16_t msb = rd_reg;
+ // Interpret sa field as 5-bit lsb of extract.
+ uint16_t lsb = sa + 32;
+ uint16_t size = msb + 1;
+ uint64_t mask = (1ul << size) - 1;
+ if ((lsb + msb + 1) > 64)
+ alu_out = Unpredictable;
+ else
+ alu_out = (U64(rs) & (mask << lsb)) >> lsb;
+ break;
+ }
+ case ff_bshfl: { // Mips32r2 instruction.
+ if (16 == sa) // seb
+ alu_out = I64(I8(rt));
+ else if (24 == sa) // seh
+ alu_out = I64(I16(rt));
+ break;
+ }
+ default:
+ MOZ_CRASH();
+ };
+ break;
+ default:
+ MOZ_CRASH();
+ };
+}
+
+// Handle execution based on instruction types.
+void
+Simulator::decodeTypeRegister(SimInstruction* instr)
+{
+ // Instruction fields.
+ const Opcode op = instr->opcodeFieldRaw();
+ const int32_t rs_reg = instr->rsValue();
+ const int64_t rs = getRegister(rs_reg);
+ const int32_t rt_reg = instr->rtValue();
+ const int64_t rt = getRegister(rt_reg);
+ const int32_t rd_reg = instr->rdValue();
+
+ const int32_t fr_reg = instr->frValue();
+ const int32_t fs_reg = instr->fsValue();
+ const int32_t ft_reg = instr->ftValue();
+ const int32_t fd_reg = instr->fdValue();
+ __int128 i128hilo = 0;
+ unsigned __int128 u128hilo = 0;
+
+ // ALU output.
+ // It should not be used as is. Instructions using it should always
+ // initialize it first.
+ int64_t alu_out = 0x12345678;
+
+ // For break and trap instructions.
+ bool do_interrupt = false;
+
+ // For jr and jalr.
+ // Get current pc.
+ int64_t current_pc = get_pc();
+ // Next pc
+ int64_t next_pc = 0;
+ int32_t return_addr_reg = 31;
+
+ // Set up the variables if needed before executing the instruction.
+ configureTypeRegister(instr,
+ alu_out,
+ i128hilo,
+ u128hilo,
+ next_pc,
+ return_addr_reg,
+ do_interrupt);
+
+ // ---------- Raise exceptions triggered.
+ signalExceptions();
+
+ // ---------- Execution.
+ switch (op) {
+ case op_cop1:
+ switch (instr->rsFieldRaw()) {
+ case rs_bc1: // Branch on coprocessor condition.
+ MOZ_CRASH();
+ break;
+ case rs_cfc1:
+ setRegister(rt_reg, alu_out);
+ case rs_mfc1:
+ setRegister(rt_reg, alu_out);
+ break;
+ case rs_dmfc1:
+ setRegister(rt_reg, alu_out);
+ break;
+ case rs_mfhc1:
+ setRegister(rt_reg, alu_out);
+ break;
+ case rs_ctc1:
+ // At the moment only FCSR is supported.
+ MOZ_ASSERT(fs_reg == kFCSRRegister);
+ FCSR_ = registers_[rt_reg];
+ break;
+ case rs_mtc1:
+ setFpuRegisterLo(fs_reg, registers_[rt_reg]);
+ break;
+ case rs_dmtc1:
+ setFpuRegister(fs_reg, registers_[rt_reg]);
+ break;
+ case rs_mthc1:
+ setFpuRegisterHi(fs_reg, registers_[rt_reg]);
+ break;
+ case rs_s:
+ float f, ft_value, fs_value;
+ uint32_t cc, fcsr_cc;
+ int64_t i64;
+ fs_value = getFpuRegisterFloat(fs_reg);
+ ft_value = getFpuRegisterFloat(ft_reg);
+ cc = instr->fcccValue();
+ fcsr_cc = GetFCSRConditionBit(cc);
+ switch (instr->functionFieldRaw()) {
+ case ff_add_fmt:
+ setFpuRegisterFloat(fd_reg, fs_value + ft_value);
+ break;
+ case ff_sub_fmt:
+ setFpuRegisterFloat(fd_reg, fs_value - ft_value);
+ break;
+ case ff_mul_fmt:
+ setFpuRegisterFloat(fd_reg, fs_value * ft_value);
+ break;
+ case ff_div_fmt:
+ setFpuRegisterFloat(fd_reg, fs_value / ft_value);
+ break;
+ case ff_abs_fmt:
+ setFpuRegisterFloat(fd_reg, fabsf(fs_value));
+ break;
+ case ff_mov_fmt:
+ setFpuRegisterFloat(fd_reg, fs_value);
+ break;
+ case ff_neg_fmt:
+ setFpuRegisterFloat(fd_reg, -fs_value);
+ break;
+ case ff_sqrt_fmt:
+ setFpuRegisterFloat(fd_reg, sqrtf(fs_value));
+ break;
+ case ff_c_un_fmt:
+ setFCSRBit(fcsr_cc, mozilla::IsNaN(fs_value) || mozilla::IsNaN(ft_value));
+ break;
+ case ff_c_eq_fmt:
+ setFCSRBit(fcsr_cc, (fs_value == ft_value));
+ break;
+ case ff_c_ueq_fmt:
+ setFCSRBit(fcsr_cc,
+ (fs_value == ft_value) || (mozilla::IsNaN(fs_value) || mozilla::IsNaN(ft_value)));
+ break;
+ case ff_c_olt_fmt:
+ setFCSRBit(fcsr_cc, (fs_value < ft_value));
+ break;
+ case ff_c_ult_fmt:
+ setFCSRBit(fcsr_cc,
+ (fs_value < ft_value) || (mozilla::IsNaN(fs_value) || mozilla::IsNaN(ft_value)));
+ break;
+ case ff_c_ole_fmt:
+ setFCSRBit(fcsr_cc, (fs_value <= ft_value));
+ break;
+ case ff_c_ule_fmt:
+ setFCSRBit(fcsr_cc,
+ (fs_value <= ft_value) || (mozilla::IsNaN(fs_value) || mozilla::IsNaN(ft_value)));
+ break;
+ case ff_cvt_d_fmt:
+ f = getFpuRegisterFloat(fs_reg);
+ setFpuRegisterDouble(fd_reg, static_cast<double>(f));
+ break;
+ case ff_cvt_w_fmt: // Convert float to word.
+ // Rounding modes are not yet supported.
+ MOZ_ASSERT((FCSR_ & 3) == 0);
+ // In rounding mode 0 it should behave like ROUND.
+ case ff_round_w_fmt: { // Round double to word (round half to even).
+ float rounded = std::floor(fs_value + 0.5);
+ int32_t result = I32(rounded);
+ if ((result & 1) != 0 && result - fs_value == 0.5) {
+ // If the number is halfway between two integers,
+ // round to the even one.
+ result--;
+ }
+ setFpuRegisterLo(fd_reg, result);
+ if (setFCSRRoundError(fs_value, rounded)) {
+ setFpuRegisterLo(fd_reg, kFPUInvalidResult);
+ }
+ break;
+ }
+ case ff_trunc_w_fmt: { // Truncate float to word (round towards 0).
+ float rounded = truncf(fs_value);
+ int32_t result = I32(rounded);
+ setFpuRegisterLo(fd_reg, result);
+ if (setFCSRRoundError(fs_value, rounded)) {
+ setFpuRegisterLo(fd_reg, kFPUInvalidResult);
+ }
+ break;
+ }
+ case ff_floor_w_fmt: { // Round float to word towards negative infinity.
+ float rounded = std::floor(fs_value);
+ int32_t result = I32(rounded);
+ setFpuRegisterLo(fd_reg, result);
+ if (setFCSRRoundError(fs_value, rounded)) {
+ setFpuRegisterLo(fd_reg, kFPUInvalidResult);
+ }
+ break;
+ }
+ case ff_ceil_w_fmt: { // Round double to word towards positive infinity.
+ float rounded = std::ceil(fs_value);
+ int32_t result = I32(rounded);
+ setFpuRegisterLo(fd_reg, result);
+ if (setFCSRRoundError(fs_value, rounded)) {
+ setFpuRegisterLo(fd_reg, kFPUInvalidResult);
+ }
+ break;
+ }
+ case ff_cvt_l_fmt: { // Mips64r2: Truncate float to 64-bit long-word.
+ float rounded = truncf(fs_value);
+ i64 = I64(rounded);
+ setFpuRegister(fd_reg, i64);
+ break;
+ }
+ case ff_round_l_fmt: { // Mips64r2 instruction.
+ float rounded =
+ fs_value > 0 ? std::floor(fs_value + 0.5) : std::ceil(fs_value - 0.5);
+ i64 = I64(rounded);
+ setFpuRegister(fd_reg, i64);
+ break;
+ }
+ case ff_trunc_l_fmt: { // Mips64r2 instruction.
+ float rounded = truncf(fs_value);
+ i64 = I64(rounded);
+ setFpuRegister(fd_reg, i64);
+ break;
+ }
+ case ff_floor_l_fmt: // Mips64r2 instruction.
+ i64 = I64(std::floor(fs_value));
+ setFpuRegister(fd_reg, i64);
+ break;
+ case ff_ceil_l_fmt: // Mips64r2 instruction.
+ i64 = I64(std::ceil(fs_value));
+ setFpuRegister(fd_reg, i64);
+ break;
+ case ff_cvt_ps_s:
+ case ff_c_f_fmt:
+ MOZ_CRASH();
+ break;
+ default:
+ MOZ_CRASH();
+ }
+ break;
+ case rs_d:
+ double dt_value, ds_value;
+ ds_value = getFpuRegisterDouble(fs_reg);
+ dt_value = getFpuRegisterDouble(ft_reg);
+ cc = instr->fcccValue();
+ fcsr_cc = GetFCSRConditionBit(cc);
+ switch (instr->functionFieldRaw()) {
+ case ff_add_fmt:
+ setFpuRegisterDouble(fd_reg, ds_value + dt_value);
+ break;
+ case ff_sub_fmt:
+ setFpuRegisterDouble(fd_reg, ds_value - dt_value);
+ break;
+ case ff_mul_fmt:
+ setFpuRegisterDouble(fd_reg, ds_value * dt_value);
+ break;
+ case ff_div_fmt:
+ setFpuRegisterDouble(fd_reg, ds_value / dt_value);
+ break;
+ case ff_abs_fmt:
+ setFpuRegisterDouble(fd_reg, fabs(ds_value));
+ break;
+ case ff_mov_fmt:
+ setFpuRegisterDouble(fd_reg, ds_value);
+ break;
+ case ff_neg_fmt:
+ setFpuRegisterDouble(fd_reg, -ds_value);
+ break;
+ case ff_sqrt_fmt:
+ setFpuRegisterDouble(fd_reg, sqrt(ds_value));
+ break;
+ case ff_c_un_fmt:
+ setFCSRBit(fcsr_cc, mozilla::IsNaN(ds_value) || mozilla::IsNaN(dt_value));
+ break;
+ case ff_c_eq_fmt:
+ setFCSRBit(fcsr_cc, (ds_value == dt_value));
+ break;
+ case ff_c_ueq_fmt:
+ setFCSRBit(fcsr_cc,
+ (ds_value == dt_value) || (mozilla::IsNaN(ds_value) || mozilla::IsNaN(dt_value)));
+ break;
+ case ff_c_olt_fmt:
+ setFCSRBit(fcsr_cc, (ds_value < dt_value));
+ break;
+ case ff_c_ult_fmt:
+ setFCSRBit(fcsr_cc,
+ (ds_value < dt_value) || (mozilla::IsNaN(ds_value) || mozilla::IsNaN(dt_value)));
+ break;
+ case ff_c_ole_fmt:
+ setFCSRBit(fcsr_cc, (ds_value <= dt_value));
+ break;
+ case ff_c_ule_fmt:
+ setFCSRBit(fcsr_cc,
+ (ds_value <= dt_value) || (mozilla::IsNaN(ds_value) || mozilla::IsNaN(dt_value)));
+ break;
+ case ff_cvt_w_fmt: // Convert double to word.
+ // Rounding modes are not yet supported.
+ MOZ_ASSERT((FCSR_ & 3) == 0);
+ // In rounding mode 0 it should behave like ROUND.
+ case ff_round_w_fmt: { // Round double to word (round half to even).
+ double rounded = std::floor(ds_value + 0.5);
+ int32_t result = I32(rounded);
+ if ((result & 1) != 0 && result - ds_value == 0.5) {
+ // If the number is halfway between two integers,
+ // round to the even one.
+ result--;
+ }
+ setFpuRegisterLo(fd_reg, result);
+ if (setFCSRRoundError(ds_value, rounded))
+ setFpuRegisterLo(fd_reg, kFPUInvalidResult);
+ break;
+ }
+ case ff_trunc_w_fmt: { // Truncate double to word (round towards 0).
+ double rounded = trunc(ds_value);
+ int32_t result = I32(rounded);
+ setFpuRegisterLo(fd_reg, result);
+ if (setFCSRRoundError(ds_value, rounded))
+ setFpuRegisterLo(fd_reg, kFPUInvalidResult);
+ break;
+ }
+ case ff_floor_w_fmt: { // Round double to word towards negative infinity.
+ double rounded = std::floor(ds_value);
+ int32_t result = I32(rounded);
+ setFpuRegisterLo(fd_reg, result);
+ if (setFCSRRoundError(ds_value, rounded))
+ setFpuRegisterLo(fd_reg, kFPUInvalidResult);
+ break;
+ }
+ case ff_ceil_w_fmt: { // Round double to word towards positive infinity.
+ double rounded = std::ceil(ds_value);
+ int32_t result = I32(rounded);
+ setFpuRegisterLo(fd_reg, result);
+ if (setFCSRRoundError(ds_value, rounded))
+ setFpuRegisterLo(fd_reg, kFPUInvalidResult);
+ break;
+ }
+ case ff_cvt_s_fmt: // Convert double to float (single).
+ setFpuRegisterFloat(fd_reg, static_cast<float>(ds_value));
+ break;
+ case ff_cvt_l_fmt: { // Mips64r2: Truncate double to 64-bit long-word.
+ double rounded = trunc(ds_value);
+ i64 = I64(rounded);
+ setFpuRegister(fd_reg, i64);
+ break;
+ }
+ case ff_trunc_l_fmt: { // Mips64r2 instruction.
+ double rounded = trunc(ds_value);
+ i64 = I64(rounded);
+ setFpuRegister(fd_reg, i64);
+ break;
+ }
+ case ff_round_l_fmt: { // Mips64r2 instruction.
+ double rounded =
+ ds_value > 0 ? std::floor(ds_value + 0.5) : std::ceil(ds_value - 0.5);
+ i64 = I64(rounded);
+ setFpuRegister(fd_reg, i64);
+ break;
+ }
+ case ff_floor_l_fmt: // Mips64r2 instruction.
+ i64 = I64(std::floor(ds_value));
+ setFpuRegister(fd_reg, i64);
+ break;
+ case ff_ceil_l_fmt: // Mips64r2 instruction.
+ i64 = I64(std::ceil(ds_value));
+ setFpuRegister(fd_reg, i64);
+ break;
+ case ff_c_f_fmt:
+ MOZ_CRASH();
+ break;
+ default:
+ MOZ_CRASH();
+ }
+ break;
+ case rs_w:
+ switch (instr->functionFieldRaw()) {
+ case ff_cvt_s_fmt: // Convert word to float (single).
+ i64 = getFpuRegisterLo(fs_reg);
+ setFpuRegisterFloat(fd_reg, static_cast<float>(i64));
+ break;
+ case ff_cvt_d_fmt: // Convert word to double.
+ i64 = getFpuRegisterLo(fs_reg);
+ setFpuRegisterDouble(fd_reg, static_cast<double>(i64));
+ break;
+ default:
+ MOZ_CRASH();
+ };
+ break;
+ case rs_l:
+ switch (instr->functionFieldRaw()) {
+ case ff_cvt_d_fmt: // Mips64r2 instruction.
+ i64 = getFpuRegister(fs_reg);
+ setFpuRegisterDouble(fd_reg, static_cast<double>(i64));
+ break;
+ case ff_cvt_s_fmt:
+ MOZ_CRASH();
+ break;
+ default:
+ MOZ_CRASH();
+ }
+ break;
+ case rs_ps:
+ break;
+ default:
+ MOZ_CRASH();
+ };
+ break;
+ case op_cop1x:
+ switch (instr->functionFieldRaw()) {
+ case ff_madd_s:
+ float fr, ft, fs;
+ fr = getFpuRegisterFloat(fr_reg);
+ fs = getFpuRegisterFloat(fs_reg);
+ ft = getFpuRegisterFloat(ft_reg);
+ setFpuRegisterFloat(fd_reg, fs * ft + fr);
+ break;
+ case ff_madd_d:
+ double dr, dt, ds;
+ dr = getFpuRegisterDouble(fr_reg);
+ ds = getFpuRegisterDouble(fs_reg);
+ dt = getFpuRegisterDouble(ft_reg);
+ setFpuRegisterDouble(fd_reg, ds * dt + dr);
+ break;
+ default:
+ MOZ_CRASH();
+ };
+ break;
+ case op_special:
+ switch (instr->functionFieldRaw()) {
+ case ff_jr: {
+ SimInstruction* branch_delay_instr = reinterpret_cast<SimInstruction*>(
+ current_pc + SimInstruction::kInstrSize);
+ branchDelayInstructionDecode(branch_delay_instr);
+ set_pc(next_pc);
+ pc_modified_ = true;
+ break;
+ }
+ case ff_jalr: {
+ SimInstruction* branch_delay_instr = reinterpret_cast<SimInstruction*>(
+ current_pc + SimInstruction::kInstrSize);
+ setRegister(return_addr_reg, current_pc + 2 * SimInstruction::kInstrSize);
+ branchDelayInstructionDecode(branch_delay_instr);
+ set_pc(next_pc);
+ pc_modified_ = true;
+ break;
+ }
+ // Instructions using HI and LO registers.
+ case ff_mult:
+ setRegister(LO, I32(i128hilo & 0xffffffff));
+ setRegister(HI, I32(i128hilo >> 32));
+ break;
+ case ff_dmult:
+ setRegister(LO, I64(i128hilo & 0xfffffffffffffffful));
+ setRegister(HI, I64(i128hilo >> 64));
+ break;
+ case ff_multu:
+ setRegister(LO, I32(u128hilo & 0xffffffff));
+ setRegister(HI, I32(u128hilo >> 32));
+ break;
+ case ff_dmultu:
+ setRegister(LO, I64(u128hilo & 0xfffffffffffffffful));
+ setRegister(HI, I64(u128hilo >> 64));
+ break;
+ case ff_div:
+ case ff_divu:
+ // Divide by zero and overflow was not checked in the configuration
+ // step - div and divu do not raise exceptions. On division by 0
+ // the result will be UNPREDICTABLE. On overflow (INT_MIN/-1),
+ // return INT_MIN which is what the hardware does.
+ setRegister(LO, I32(i128hilo & 0xffffffff));
+ setRegister(HI, I32(i128hilo >> 32));
+ break;
+ case ff_ddiv:
+ case ff_ddivu:
+ // Divide by zero and overflow was not checked in the configuration
+ // step - div and divu do not raise exceptions. On division by 0
+ // the result will be UNPREDICTABLE. On overflow (INT_MIN/-1),
+ // return INT_MIN which is what the hardware does.
+ setRegister(LO, I64(i128hilo & 0xfffffffffffffffful));
+ setRegister(HI, I64(i128hilo >> 64));
+ break;
+ case ff_sync:
+ break;
+ // Break and trap instructions.
+ case ff_break:
+ case ff_tge:
+ case ff_tgeu:
+ case ff_tlt:
+ case ff_tltu:
+ case ff_teq:
+ case ff_tne:
+ if (do_interrupt) {
+ softwareInterrupt(instr);
+ }
+ break;
+ // Conditional moves.
+ case ff_movn:
+ if (rt)
+ setRegister(rd_reg, rs);
+ break;
+ case ff_movci: {
+ uint32_t cc = instr->fbccValue();
+ uint32_t fcsr_cc = GetFCSRConditionBit(cc);
+ if (instr->bit(16)) { // Read Tf bit.
+ if (testFCSRBit(fcsr_cc))
+ setRegister(rd_reg, rs);
+ } else {
+ if (!testFCSRBit(fcsr_cc))
+ setRegister(rd_reg, rs);
+ }
+ break;
+ }
+ case ff_movz:
+ if (!rt)
+ setRegister(rd_reg, rs);
+ break;
+ default: // For other special opcodes we do the default operation.
+ setRegister(rd_reg, alu_out);
+ };
+ break;
+ case op_special2:
+ switch (instr->functionFieldRaw()) {
+ case ff_mul:
+ setRegister(rd_reg, alu_out);
+ // HI and LO are UNPREDICTABLE after the operation.
+ setRegister(LO, Unpredictable);
+ setRegister(HI, Unpredictable);
+ break;
+ default: // For other special2 opcodes we do the default operation.
+ setRegister(rd_reg, alu_out);
+ }
+ break;
+ case op_special3:
+ switch (instr->functionFieldRaw()) {
+ case ff_ins:
+ case ff_dins:
+ case ff_dinsm:
+ case ff_dinsu:
+ // Ins instr leaves result in Rt, rather than Rd.
+ setRegister(rt_reg, alu_out);
+ break;
+ case ff_ext:
+ case ff_dext:
+ case ff_dextm:
+ case ff_dextu:
+ // Ext instr leaves result in Rt, rather than Rd.
+ setRegister(rt_reg, alu_out);
+ break;
+ case ff_bshfl:
+ setRegister(rd_reg, alu_out);
+ break;
+ default:
+ MOZ_CRASH();
+ };
+ break;
+ // Unimplemented opcodes raised an error in the configuration step before,
+ // so we can use the default here to set the destination register in common
+ // cases.
+ default:
+ setRegister(rd_reg, alu_out);
+ };
+}
+
+// Type 2: instructions using a 16 bits immediate. (e.g. addi, beq).
+void
+Simulator::decodeTypeImmediate(SimInstruction* instr)
+{
+ // Instruction fields.
+ Opcode op = instr->opcodeFieldRaw();
+ int64_t rs = getRegister(instr->rsValue());
+ int32_t rt_reg = instr->rtValue(); // Destination register.
+ int64_t rt = getRegister(rt_reg);
+ int16_t imm16 = instr->imm16Value();
+
+ int32_t ft_reg = instr->ftValue(); // Destination register.
+
+ // Zero extended immediate.
+ uint32_t oe_imm16 = 0xffff & imm16;
+ // Sign extended immediate.
+ int32_t se_imm16 = imm16;
+
+ // Get current pc.
+ int64_t current_pc = get_pc();
+ // Next pc.
+ int64_t next_pc = bad_ra;
+
+ // Used for conditional branch instructions.
+ bool do_branch = false;
+ bool execute_branch_delay_instruction = false;
+
+ // Used for arithmetic instructions.
+ int64_t alu_out = 0;
+ // Floating point.
+ double fp_out = 0.0;
+ uint32_t cc, cc_value, fcsr_cc;
+
+ // Used for memory instructions.
+ uint64_t addr = 0x0;
+ // Value to be written in memory.
+ uint64_t mem_value = 0x0;
+ __int128 temp;
+
+ // ---------- Configuration (and execution for op_regimm).
+ switch (op) {
+ // ------------- op_cop1. Coprocessor instructions.
+ case op_cop1:
+ switch (instr->rsFieldRaw()) {
+ case rs_bc1: // Branch on coprocessor condition.
+ cc = instr->fbccValue();
+ fcsr_cc = GetFCSRConditionBit(cc);
+ cc_value = testFCSRBit(fcsr_cc);
+ do_branch = (instr->fbtrueValue()) ? cc_value : !cc_value;
+ execute_branch_delay_instruction = true;
+ // Set next_pc.
+ if (do_branch)
+ next_pc = current_pc + (imm16 << 2) + SimInstruction::kInstrSize;
+ else
+ next_pc = current_pc + kBranchReturnOffset;
+ break;
+ default:
+ MOZ_CRASH();
+ };
+ break;
+ // ------------- op_regimm class.
+ case op_regimm:
+ switch (instr->rtFieldRaw()) {
+ case rt_bltz:
+ do_branch = (rs < 0);
+ break;
+ case rt_bltzal:
+ do_branch = rs < 0;
+ break;
+ case rt_bgez:
+ do_branch = rs >= 0;
+ break;
+ case rt_bgezal:
+ do_branch = rs >= 0;
+ break;
+ default:
+ MOZ_CRASH();
+ };
+ switch (instr->rtFieldRaw()) {
+ case rt_bltz:
+ case rt_bltzal:
+ case rt_bgez:
+ case rt_bgezal:
+ // Branch instructions common part.
+ execute_branch_delay_instruction = true;
+ // Set next_pc.
+ if (do_branch) {
+ next_pc = current_pc + (imm16 << 2) + SimInstruction::kInstrSize;
+ if (instr->isLinkingInstruction())
+ setRegister(31, current_pc + kBranchReturnOffset);
+ } else {
+ next_pc = current_pc + kBranchReturnOffset;
+ }
+ default:
+ break;
+ };
+ break; // case op_regimm.
+ // ------------- Branch instructions.
+ // When comparing to zero, the encoding of rt field is always 0, so we don't
+ // need to replace rt with zero.
+ case op_beq:
+ do_branch = (rs == rt);
+ break;
+ case op_bne:
+ do_branch = rs != rt;
+ break;
+ case op_blez:
+ do_branch = rs <= 0;
+ break;
+ case op_bgtz:
+ do_branch = rs > 0;
+ break;
+ // ------------- Arithmetic instructions.
+ case op_addi:
+ alu_out = I32(rs) + se_imm16;
+ if ((alu_out << 32) != (alu_out << 31))
+ exceptions[kIntegerOverflow] = 1;
+ alu_out = I32(alu_out);
+ break;
+ case op_daddi:
+ temp = alu_out = rs + se_imm16;
+ if ((temp << 64) != (temp << 63))
+ exceptions[kIntegerOverflow] = 1;
+ alu_out = I64(temp);
+ break;
+ case op_addiu:
+ alu_out = I32(I32(rs) + se_imm16);
+ break;
+ case op_daddiu:
+ alu_out = rs + se_imm16;
+ break;
+ case op_slti:
+ alu_out = (rs < se_imm16) ? 1 : 0;
+ break;
+ case op_sltiu:
+ alu_out = (U64(rs) < U64(se_imm16)) ? 1 : 0;
+ break;
+ case op_andi:
+ alu_out = rs & oe_imm16;
+ break;
+ case op_ori:
+ alu_out = rs | oe_imm16;
+ break;
+ case op_xori:
+ alu_out = rs ^ oe_imm16;
+ break;
+ case op_lui:
+ alu_out = (se_imm16 << 16);
+ break;
+ // ------------- Memory instructions.
+ case op_lbu:
+ addr = rs + se_imm16;
+ alu_out = readBU(addr, instr);
+ break;
+ case op_lb:
+ addr = rs + se_imm16;
+ alu_out = readB(addr, instr);
+ break;
+ case op_lhu:
+ addr = rs + se_imm16;
+ alu_out = readHU(addr, instr);
+ break;
+ case op_lh:
+ addr = rs + se_imm16;
+ alu_out = readH(addr, instr);
+ break;
+ case op_lwu:
+ addr = rs + se_imm16;
+ alu_out = readWU(addr, instr);
+ break;
+ case op_lw:
+ addr = rs + se_imm16;
+ alu_out = readW(addr, instr);
+ break;
+ case op_lwl: {
+ // al_offset is offset of the effective address within an aligned word.
+ uint8_t al_offset = (rs + se_imm16) & 3;
+ uint8_t byte_shift = 3 - al_offset;
+ uint32_t mask = (1 << byte_shift * 8) - 1;
+ addr = rs + se_imm16 - al_offset;
+ alu_out = readW(addr, instr);
+ alu_out <<= byte_shift * 8;
+ alu_out |= rt & mask;
+ break;
+ }
+ case op_lwr: {
+ // al_offset is offset of the effective address within an aligned word.
+ uint8_t al_offset = (rs + se_imm16) & 3;
+ uint8_t byte_shift = 3 - al_offset;
+ uint32_t mask = al_offset ? (~0 << (byte_shift + 1) * 8) : 0;
+ addr = rs + se_imm16 - al_offset;
+ alu_out = readW(addr, instr);
+ alu_out = U32(alu_out) >> al_offset * 8;
+ alu_out |= rt & mask;
+ break;
+ }
+ case op_ll:
+ addr = rs + se_imm16;
+ alu_out = readW(addr, instr);
+ break;
+ case op_ld:
+ addr = rs + se_imm16;
+ alu_out = readDW(addr, instr);
+ break;
+ case op_ldl: {
+ // al_offset is offset of the effective address within an aligned word.
+ uint8_t al_offset = (rs + se_imm16) & 7;
+ uint8_t byte_shift = 7 - al_offset;
+ uint64_t mask = (1ul << byte_shift * 8) - 1;
+ addr = rs + se_imm16 - al_offset;
+ alu_out = readDW(addr, instr);
+ alu_out <<= byte_shift * 8;
+ alu_out |= rt & mask;
+ break;
+ }
+ case op_ldr: {
+ // al_offset is offset of the effective address within an aligned word.
+ uint8_t al_offset = (rs + se_imm16) & 7;
+ uint8_t byte_shift = 7 - al_offset;
+ uint64_t mask = al_offset ? (~0ul << (byte_shift + 1) * 8) : 0;
+ addr = rs + se_imm16 - al_offset;
+ alu_out = readDW(addr, instr);
+ alu_out = U64(alu_out) >> al_offset * 8;
+ alu_out |= rt & mask;
+ break;
+ }
+ case op_sb:
+ addr = rs + se_imm16;
+ break;
+ case op_sh:
+ addr = rs + se_imm16;
+ break;
+ case op_sw:
+ addr = rs + se_imm16;
+ break;
+ case op_swl: {
+ uint8_t al_offset = (rs + se_imm16) & 3;
+ uint8_t byte_shift = 3 - al_offset;
+ uint32_t mask = byte_shift ? (~0 << (al_offset + 1) * 8) : 0;
+ addr = rs + se_imm16 - al_offset;
+ mem_value = readW(addr, instr) & mask;
+ mem_value |= U32(rt) >> byte_shift * 8;
+ break;
+ }
+ case op_swr: {
+ uint8_t al_offset = (rs + se_imm16) & 3;
+ uint32_t mask = (1 << al_offset * 8) - 1;
+ addr = rs + se_imm16 - al_offset;
+ mem_value = readW(addr, instr);
+ mem_value = (rt << al_offset * 8) | (mem_value & mask);
+ break;
+ }
+ case op_sc:
+ addr = rs + se_imm16;
+ break;
+ case op_sd:
+ addr = rs + se_imm16;
+ break;
+ case op_sdl: {
+ uint8_t al_offset = (rs + se_imm16) & 7;
+ uint8_t byte_shift = 7 - al_offset;
+ uint64_t mask = byte_shift ? (~0ul << (al_offset + 1) * 8) : 0;
+ addr = rs + se_imm16 - al_offset;
+ mem_value = readW(addr, instr) & mask;
+ mem_value |= U64(rt) >> byte_shift * 8;
+ break;
+ }
+ case op_sdr: {
+ uint8_t al_offset = (rs + se_imm16) & 7;
+ uint64_t mask = (1ul << al_offset * 8) - 1;
+ addr = rs + se_imm16 - al_offset;
+ mem_value = readW(addr, instr);
+ mem_value = (rt << al_offset * 8) | (mem_value & mask);
+ break;
+ }
+ case op_lwc1:
+ addr = rs + se_imm16;
+ alu_out = readW(addr, instr);
+ break;
+ case op_ldc1:
+ addr = rs + se_imm16;
+ fp_out = readD(addr, instr);
+ break;
+ case op_swc1:
+ case op_sdc1:
+ addr = rs + se_imm16;
+ break;
+ default:
+ MOZ_CRASH();
+ };
+
+ // ---------- Raise exceptions triggered.
+ signalExceptions();
+
+ // ---------- Execution.
+ switch (op) {
+ // ------------- Branch instructions.
+ case op_beq:
+ case op_bne:
+ case op_blez:
+ case op_bgtz:
+ // Branch instructions common part.
+ execute_branch_delay_instruction = true;
+ // Set next_pc.
+ if (do_branch) {
+ next_pc = current_pc + (imm16 << 2) + SimInstruction::kInstrSize;
+ if (instr->isLinkingInstruction()) {
+ setRegister(31, current_pc + 2 * SimInstruction::kInstrSize);
+ }
+ } else {
+ next_pc = current_pc + 2 * SimInstruction::kInstrSize;
+ }
+ break;
+ // ------------- Arithmetic instructions.
+ case op_addi:
+ case op_daddi:
+ case op_addiu:
+ case op_daddiu:
+ case op_slti:
+ case op_sltiu:
+ case op_andi:
+ case op_ori:
+ case op_xori:
+ case op_lui:
+ setRegister(rt_reg, alu_out);
+ break;
+ // ------------- Memory instructions.
+ case op_lbu:
+ case op_lb:
+ case op_lhu:
+ case op_lh:
+ case op_lwu:
+ case op_lw:
+ case op_lwl:
+ case op_lwr:
+ case op_ll:
+ case op_ld:
+ case op_ldl:
+ case op_ldr:
+ setRegister(rt_reg, alu_out);
+ break;
+ case op_sb:
+ writeB(addr, I8(rt), instr);
+ break;
+ case op_sh:
+ writeH(addr, U16(rt), instr);
+ break;
+ case op_sw:
+ writeW(addr, I32(rt), instr);
+ break;
+ case op_swl:
+ writeW(addr, I32(mem_value), instr);
+ break;
+ case op_swr:
+ writeW(addr, I32(mem_value), instr);
+ break;
+ case op_sc:
+ writeW(addr, I32(rt), instr);
+ setRegister(rt_reg, 1);
+ break;
+ case op_sd:
+ writeDW(addr, rt, instr);
+ break;
+ case op_sdl:
+ writeDW(addr, mem_value, instr);
+ break;
+ case op_sdr:
+ writeDW(addr, mem_value, instr);
+ break;
+ case op_lwc1:
+ setFpuRegisterLo(ft_reg, alu_out);
+ break;
+ case op_ldc1:
+ setFpuRegisterDouble(ft_reg, fp_out);
+ break;
+ case op_swc1:
+ writeW(addr, getFpuRegisterLo(ft_reg), instr);
+ break;
+ case op_sdc1:
+ writeD(addr, getFpuRegisterDouble(ft_reg), instr);
+ break;
+ default:
+ break;
+ };
+
+
+ if (execute_branch_delay_instruction) {
+ // Execute branch delay slot
+ // We don't check for end_sim_pc. First it should not be met as the current
+ // pc is valid. Secondly a jump should always execute its branch delay slot.
+ SimInstruction* branch_delay_instr =
+ reinterpret_cast<SimInstruction*>(current_pc + SimInstruction::kInstrSize);
+ branchDelayInstructionDecode(branch_delay_instr);
+ }
+
+ // If needed update pc after the branch delay execution.
+ if (next_pc != bad_ra)
+ set_pc(next_pc);
+}
+
+// Type 3: instructions using a 26 bits immediate. (e.g. j, jal).
+void
+Simulator::decodeTypeJump(SimInstruction* instr)
+{
+ // Get current pc.
+ int64_t current_pc = get_pc();
+ // Get unchanged bits of pc.
+ int64_t pc_high_bits = current_pc & 0xfffffffff0000000ul;
+ // Next pc.
+ int64_t next_pc = pc_high_bits | (instr->imm26Value() << 2);
+
+ // Execute branch delay slot.
+ // We don't check for end_sim_pc. First it should not be met as the current pc
+ // is valid. Secondly a jump should always execute its branch delay slot.
+ SimInstruction* branch_delay_instr =
+ reinterpret_cast<SimInstruction*>(current_pc + SimInstruction::kInstrSize);
+ branchDelayInstructionDecode(branch_delay_instr);
+
+ // Update pc and ra if necessary.
+ // Do this after the branch delay execution.
+ if (instr->isLinkingInstruction())
+ setRegister(31, current_pc + 2 * SimInstruction::kInstrSize);
+ set_pc(next_pc);
+ pc_modified_ = true;
+}
+
+// Executes the current instruction.
+void
+Simulator::instructionDecode(SimInstruction* instr)
+{
+ if (Simulator::ICacheCheckingEnabled) {
+ AutoLockSimulatorCache als(this);
+ CheckICacheLocked(icache(), instr);
+ }
+ pc_modified_ = false;
+
+ switch (instr->instructionType()) {
+ case SimInstruction::kRegisterType:
+ decodeTypeRegister(instr);
+ break;
+ case SimInstruction::kImmediateType:
+ decodeTypeImmediate(instr);
+ break;
+ case SimInstruction::kJumpType:
+ decodeTypeJump(instr);
+ break;
+ default:
+ UNSUPPORTED();
+ }
+ if (!pc_modified_)
+ setRegister(pc, reinterpret_cast<int64_t>(instr) + SimInstruction::kInstrSize);
+}
+
+void
+Simulator::branchDelayInstructionDecode(SimInstruction* instr)
+{
+ if (single_stepping_)
+ single_step_callback_(single_step_callback_arg_, this, (void*)instr);
+
+ if (instr->instructionBits() == NopInst) {
+ // Short-cut generic nop instructions. They are always valid and they
+ // never change the simulator state.
+ return;
+ }
+
+ if (instr->isForbiddenInBranchDelay()) {
+ MOZ_CRASH("Eror:Unexpected opcode in a branch delay slot.");
+ }
+ instructionDecode(instr);
+}
+
+void
+Simulator::enable_single_stepping(SingleStepCallback cb, void* arg)
+{
+ single_stepping_ = true;
+ single_step_callback_ = cb;
+ single_step_callback_arg_ = arg;
+ single_step_callback_(single_step_callback_arg_, this, (void*)get_pc());
+}
+
+void
+Simulator::disable_single_stepping()
+{
+ if (!single_stepping_)
+ return;
+ single_step_callback_(single_step_callback_arg_, this, (void*)get_pc());
+ single_stepping_ = false;
+ single_step_callback_ = nullptr;
+ single_step_callback_arg_ = nullptr;
+}
+
+template<bool enableStopSimAt>
+void
+Simulator::execute()
+{
+ if (single_stepping_)
+ single_step_callback_(single_step_callback_arg_, this, nullptr);
+
+ // Get the PC to simulate. Cannot use the accessor here as we need the
+ // raw PC value and not the one used as input to arithmetic instructions.
+ int64_t program_counter = get_pc();
+ WasmActivation* activation = TlsPerThreadData.get()->runtimeFromMainThread()->wasmActivationStack();
+
+ while (program_counter != end_sim_pc) {
+ if (enableStopSimAt && (icount_ == Simulator::StopSimAt)) {
+ MipsDebugger dbg(this);
+ dbg.debug();
+ } else {
+ if (single_stepping_)
+ single_step_callback_(single_step_callback_arg_, this, (void*)program_counter);
+ SimInstruction* instr = reinterpret_cast<SimInstruction *>(program_counter);
+ instructionDecode(instr);
+ icount_++;
+
+ int64_t rpc = resume_pc_;
+ if (MOZ_UNLIKELY(rpc != 0)) {
+ // wasm signal handler ran and we have to adjust the pc.
+ activation->setResumePC((void*)get_pc());
+ set_pc(rpc);
+ resume_pc_ = 0;
+ }
+ }
+ program_counter = get_pc();
+ }
+
+ if (single_stepping_)
+ single_step_callback_(single_step_callback_arg_, this, nullptr);
+}
+
+void
+Simulator::callInternal(uint8_t* entry)
+{
+ // Prepare to execute the code at entry.
+ setRegister(pc, reinterpret_cast<int64_t>(entry));
+ // Put down marker for end of simulation. The simulator will stop simulation
+ // when the PC reaches this value. By saving the "end simulation" value into
+ // the LR the simulation stops when returning to this call point.
+ setRegister(ra, end_sim_pc);
+
+ // Remember the values of callee-saved registers.
+ // The code below assumes that r9 is not used as sb (static base) in
+ // simulator code and therefore is regarded as a callee-saved register.
+ int64_t s0_val = getRegister(s0);
+ int64_t s1_val = getRegister(s1);
+ int64_t s2_val = getRegister(s2);
+ int64_t s3_val = getRegister(s3);
+ int64_t s4_val = getRegister(s4);
+ int64_t s5_val = getRegister(s5);
+ int64_t s6_val = getRegister(s6);
+ int64_t s7_val = getRegister(s7);
+ int64_t gp_val = getRegister(gp);
+ int64_t sp_val = getRegister(sp);
+ int64_t fp_val = getRegister(fp);
+
+ // Set up the callee-saved registers with a known value. To be able to check
+ // that they are preserved properly across JS execution.
+ int64_t callee_saved_value = icount_;
+ setRegister(s0, callee_saved_value);
+ setRegister(s1, callee_saved_value);
+ setRegister(s2, callee_saved_value);
+ setRegister(s3, callee_saved_value);
+ setRegister(s4, callee_saved_value);
+ setRegister(s5, callee_saved_value);
+ setRegister(s6, callee_saved_value);
+ setRegister(s7, callee_saved_value);
+ setRegister(gp, callee_saved_value);
+ setRegister(fp, callee_saved_value);
+
+ // Start the simulation.
+ if (Simulator::StopSimAt != -1)
+ execute<true>();
+ else
+ execute<false>();
+
+ // Check that the callee-saved registers have been preserved.
+ MOZ_ASSERT(callee_saved_value == getRegister(s0));
+ MOZ_ASSERT(callee_saved_value == getRegister(s1));
+ MOZ_ASSERT(callee_saved_value == getRegister(s2));
+ MOZ_ASSERT(callee_saved_value == getRegister(s3));
+ MOZ_ASSERT(callee_saved_value == getRegister(s4));
+ MOZ_ASSERT(callee_saved_value == getRegister(s5));
+ MOZ_ASSERT(callee_saved_value == getRegister(s6));
+ MOZ_ASSERT(callee_saved_value == getRegister(s7));
+ MOZ_ASSERT(callee_saved_value == getRegister(gp));
+ MOZ_ASSERT(callee_saved_value == getRegister(fp));
+
+ // Restore callee-saved registers with the original value.
+ setRegister(s0, s0_val);
+ setRegister(s1, s1_val);
+ setRegister(s2, s2_val);
+ setRegister(s3, s3_val);
+ setRegister(s4, s4_val);
+ setRegister(s5, s5_val);
+ setRegister(s6, s6_val);
+ setRegister(s7, s7_val);
+ setRegister(gp, gp_val);
+ setRegister(sp, sp_val);
+ setRegister(fp, fp_val);
+}
+
+int64_t
+Simulator::call(uint8_t* entry, int argument_count, ...)
+{
+ va_list parameters;
+ va_start(parameters, argument_count);
+
+ int64_t original_stack = getRegister(sp);
+ // Compute position of stack on entry to generated code.
+ int64_t entry_stack = original_stack;
+ if (argument_count > kCArgSlotCount)
+ entry_stack = entry_stack - argument_count * sizeof(int64_t);
+ else
+ entry_stack = entry_stack - kCArgsSlotsSize;
+
+ entry_stack &= ~U64(ABIStackAlignment - 1);
+
+ intptr_t* stack_argument = reinterpret_cast<intptr_t*>(entry_stack);
+
+ // Setup the arguments.
+ for (int i = 0; i < argument_count; i++) {
+ js::jit::Register argReg;
+ if (GetIntArgReg(i, &argReg))
+ setRegister(argReg.code(), va_arg(parameters, int64_t));
+ else
+ stack_argument[i] = va_arg(parameters, int64_t);
+ }
+
+ va_end(parameters);
+ setRegister(sp, entry_stack);
+
+ callInternal(entry);
+
+ // Pop stack passed arguments.
+ MOZ_ASSERT(entry_stack == getRegister(sp));
+ setRegister(sp, original_stack);
+
+ int64_t result = getRegister(v0);
+ return result;
+}
+
+uintptr_t
+Simulator::pushAddress(uintptr_t address)
+{
+ int new_sp = getRegister(sp) - sizeof(uintptr_t);
+ uintptr_t* stack_slot = reinterpret_cast<uintptr_t*>(new_sp);
+ *stack_slot = address;
+ setRegister(sp, new_sp);
+ return new_sp;
+}
+
+uintptr_t
+Simulator::popAddress()
+{
+ int current_sp = getRegister(sp);
+ uintptr_t* stack_slot = reinterpret_cast<uintptr_t*>(current_sp);
+ uintptr_t address = *stack_slot;
+ setRegister(sp, current_sp + sizeof(uintptr_t));
+ return address;
+}
+
+} // namespace jit
+} // namespace js
+
+js::jit::Simulator*
+JSRuntime::simulator() const
+{
+ return simulator_;
+}
+
+js::jit::Simulator*
+js::PerThreadData::simulator() const
+{
+ return runtime_->simulator();
+}
+
+uintptr_t*
+JSRuntime::addressOfSimulatorStackLimit()
+{
+ return simulator_->addressOfStackLimit();
+}