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![Ryan Macnak](/assets/img/avatar_default.png)
Fixes vm/cc/FunctionWithBreakpointNotInlined. Change-Id: Ie1e7616559c0d758477494c26f03e6ffde0b5e43 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/107683 Reviewed-by: Alexander Markov <alexmarkov@google.com> Reviewed-by: Régis Crelier <regis@google.com> Commit-Queue: Ryan Macnak <rmacnak@google.com>
3575 lines
117 KiB
C++
3575 lines
117 KiB
C++
// Copyright (c) 2014, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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#include <setjmp.h> // NOLINT
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#include <stdlib.h>
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#include "vm/globals.h"
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#if defined(TARGET_ARCH_ARM64)
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// Only build the simulator if not compiling for real ARM hardware.
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#if defined(USING_SIMULATOR)
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#include "vm/simulator.h"
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#include "vm/compiler/assembler/assembler.h"
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#include "vm/compiler/assembler/disassembler.h"
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#include "vm/constants.h"
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#include "vm/native_arguments.h"
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#include "vm/os_thread.h"
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#include "vm/stack_frame.h"
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namespace dart {
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DEFINE_FLAG(uint64_t,
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trace_sim_after,
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ULLONG_MAX,
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"Trace simulator execution after instruction count reached.");
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DEFINE_FLAG(uint64_t,
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stop_sim_at,
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ULLONG_MAX,
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"Instruction address or instruction count to stop simulator at.");
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// This macro provides a platform independent use of sscanf. The reason for
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// SScanF not being implemented in a platform independent way through
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// OS in the same way as SNPrint is that the Windows C Run-Time
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// Library does not provide vsscanf.
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#define SScanF sscanf // NOLINT
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// SimulatorSetjmpBuffer are linked together, and the last created one
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// is referenced by the Simulator. When an exception is thrown, the exception
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// runtime looks at where to jump and finds the corresponding
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// SimulatorSetjmpBuffer based on the stack pointer of the exception handler.
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// The runtime then does a Longjmp on that buffer to return to the simulator.
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class SimulatorSetjmpBuffer {
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public:
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void Longjmp() {
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// "This" is now the last setjmp buffer.
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simulator_->set_last_setjmp_buffer(this);
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longjmp(buffer_, 1);
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}
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explicit SimulatorSetjmpBuffer(Simulator* sim) {
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simulator_ = sim;
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link_ = sim->last_setjmp_buffer();
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sim->set_last_setjmp_buffer(this);
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sp_ = static_cast<uword>(sim->get_register(R31, R31IsSP));
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}
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~SimulatorSetjmpBuffer() {
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ASSERT(simulator_->last_setjmp_buffer() == this);
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simulator_->set_last_setjmp_buffer(link_);
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}
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SimulatorSetjmpBuffer* link() { return link_; }
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uword sp() { return sp_; }
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private:
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uword sp_;
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Simulator* simulator_;
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SimulatorSetjmpBuffer* link_;
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jmp_buf buffer_;
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friend class Simulator;
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};
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// The SimulatorDebugger class is used by the simulator while debugging
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// simulated ARM64 code.
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class SimulatorDebugger {
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public:
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explicit SimulatorDebugger(Simulator* sim);
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~SimulatorDebugger();
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void Stop(Instr* instr, const char* message);
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void Debug();
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char* ReadLine(const char* prompt);
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private:
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Simulator* sim_;
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bool GetValue(char* desc, uint64_t* value);
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bool GetSValue(char* desc, uint32_t* value);
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bool GetDValue(char* desc, uint64_t* value);
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bool GetQValue(char* desc, simd_value_t* value);
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static TokenPosition GetApproximateTokenIndex(const Code& code, uword pc);
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static void PrintDartFrame(uword pc,
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uword fp,
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uword sp,
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const Function& function,
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TokenPosition token_pos,
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bool is_optimized,
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bool is_inlined);
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void PrintBacktrace();
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// Set or delete a breakpoint. Returns true if successful.
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bool SetBreakpoint(Instr* breakpc);
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bool DeleteBreakpoint(Instr* breakpc);
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// Undo and redo all breakpoints. This is needed to bracket disassembly and
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// execution to skip past breakpoints when run from the debugger.
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void UndoBreakpoints();
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void RedoBreakpoints();
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};
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SimulatorDebugger::SimulatorDebugger(Simulator* sim) {
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sim_ = sim;
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}
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SimulatorDebugger::~SimulatorDebugger() {}
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void SimulatorDebugger::Stop(Instr* instr, const char* message) {
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OS::PrintErr("Simulator hit %s\n", message);
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Debug();
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}
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static Register LookupCpuRegisterByName(const char* name) {
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static const char* kNames[] = {
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"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
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"r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15",
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"r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23",
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"r24", "r25", "r26", "r27", "r28", "r29", "r30",
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"ip0", "ip1", "pp", "fp", "lr", "sp", "zr",
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};
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static const Register kRegisters[] = {
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R0, R1, R2, R3, R4, R5, R6, R7, R8, R9, R10,
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R11, R12, R13, R14, R15, R16, R17, R18, R19, R20, R21,
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R22, R23, R24, R25, R26, R27, R28, R29, R30,
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IP0, IP1, PP, FP, LR, R31, ZR,
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};
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ASSERT(ARRAY_SIZE(kNames) == ARRAY_SIZE(kRegisters));
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for (unsigned i = 0; i < ARRAY_SIZE(kNames); i++) {
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if (strcmp(kNames[i], name) == 0) {
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return kRegisters[i];
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}
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}
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return kNoRegister;
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}
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static VRegister LookupVRegisterByName(const char* name) {
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int reg_nr = -1;
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bool ok = SScanF(name, "v%d", ®_nr);
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if (ok && (0 <= reg_nr) && (reg_nr < kNumberOfVRegisters)) {
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return static_cast<VRegister>(reg_nr);
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}
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return kNoVRegister;
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}
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bool SimulatorDebugger::GetValue(char* desc, uint64_t* value) {
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Register reg = LookupCpuRegisterByName(desc);
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if (reg != kNoRegister) {
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if (reg == ZR) {
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*value = 0;
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return true;
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}
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*value = sim_->get_register(reg);
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return true;
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}
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if (desc[0] == '*') {
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uint64_t addr;
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if (GetValue(desc + 1, &addr)) {
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if (Simulator::IsIllegalAddress(addr)) {
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return false;
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}
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*value = *(reinterpret_cast<int64_t*>(addr));
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return true;
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}
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}
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if (strcmp("pc", desc) == 0) {
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*value = sim_->get_pc();
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return true;
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}
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bool retval = SScanF(desc, "0x%" Px64, value) == 1;
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if (!retval) {
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retval = SScanF(desc, "%" Px64, value) == 1;
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}
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return retval;
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}
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bool SimulatorDebugger::GetSValue(char* desc, uint32_t* value) {
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VRegister vreg = LookupVRegisterByName(desc);
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if (vreg != kNoVRegister) {
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*value = sim_->get_vregisters(vreg, 0);
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return true;
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}
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if (desc[0] == '*') {
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uint64_t addr;
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if (GetValue(desc + 1, &addr)) {
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if (Simulator::IsIllegalAddress(addr)) {
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return false;
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}
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*value = *(reinterpret_cast<uint32_t*>(addr));
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return true;
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}
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}
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return false;
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}
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bool SimulatorDebugger::GetDValue(char* desc, uint64_t* value) {
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VRegister vreg = LookupVRegisterByName(desc);
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if (vreg != kNoVRegister) {
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*value = sim_->get_vregisterd(vreg, 0);
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return true;
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}
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if (desc[0] == '*') {
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uint64_t addr;
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if (GetValue(desc + 1, &addr)) {
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if (Simulator::IsIllegalAddress(addr)) {
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return false;
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}
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*value = *(reinterpret_cast<uint64_t*>(addr));
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return true;
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}
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}
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return false;
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}
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bool SimulatorDebugger::GetQValue(char* desc, simd_value_t* value) {
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VRegister vreg = LookupVRegisterByName(desc);
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if (vreg != kNoVRegister) {
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sim_->get_vregister(vreg, value);
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return true;
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}
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if (desc[0] == '*') {
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uint64_t addr;
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if (GetValue(desc + 1, &addr)) {
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if (Simulator::IsIllegalAddress(addr)) {
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return false;
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}
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*value = *(reinterpret_cast<simd_value_t*>(addr));
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return true;
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}
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}
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return false;
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}
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TokenPosition SimulatorDebugger::GetApproximateTokenIndex(const Code& code,
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uword pc) {
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TokenPosition token_pos = TokenPosition::kNoSource;
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uword pc_offset = pc - code.PayloadStart();
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const PcDescriptors& descriptors =
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PcDescriptors::Handle(code.pc_descriptors());
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PcDescriptors::Iterator iter(descriptors, RawPcDescriptors::kAnyKind);
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while (iter.MoveNext()) {
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if (iter.PcOffset() == pc_offset) {
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return iter.TokenPos();
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} else if (!token_pos.IsReal() && (iter.PcOffset() > pc_offset)) {
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token_pos = iter.TokenPos();
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}
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}
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return token_pos;
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}
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void SimulatorDebugger::PrintDartFrame(uword pc,
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uword fp,
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uword sp,
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const Function& function,
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TokenPosition token_pos,
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bool is_optimized,
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bool is_inlined) {
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const Script& script = Script::Handle(function.script());
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const String& func_name = String::Handle(function.QualifiedScrubbedName());
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const String& url = String::Handle(script.url());
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intptr_t line = -1;
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intptr_t column = -1;
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if (token_pos.IsReal()) {
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script.GetTokenLocation(token_pos, &line, &column);
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}
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OS::PrintErr(
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"pc=0x%" Px " fp=0x%" Px " sp=0x%" Px " %s%s (%s:%" Pd ":%" Pd ")\n", pc,
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fp, sp, is_optimized ? (is_inlined ? "inlined " : "optimized ") : "",
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func_name.ToCString(), url.ToCString(), line, column);
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}
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void SimulatorDebugger::PrintBacktrace() {
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StackFrameIterator frames(
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sim_->get_register(FP), sim_->get_register(SP), sim_->get_pc(),
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ValidationPolicy::kDontValidateFrames, Thread::Current(),
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StackFrameIterator::kNoCrossThreadIteration);
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StackFrame* frame = frames.NextFrame();
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ASSERT(frame != NULL);
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Function& function = Function::Handle();
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Function& inlined_function = Function::Handle();
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Code& code = Code::Handle();
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Code& unoptimized_code = Code::Handle();
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while (frame != NULL) {
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if (frame->IsDartFrame()) {
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ASSERT(!frame->is_interpreted()); // Not yet supported.
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code = frame->LookupDartCode();
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function = code.function();
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if (code.is_optimized()) {
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// For optimized frames, extract all the inlined functions if any
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// into the stack trace.
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InlinedFunctionsIterator it(code, frame->pc());
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while (!it.Done()) {
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// Print each inlined frame with its pc in the corresponding
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// unoptimized frame.
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inlined_function = it.function();
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unoptimized_code = it.code();
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uword unoptimized_pc = it.pc();
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it.Advance();
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if (!it.Done()) {
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PrintDartFrame(
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unoptimized_pc, frame->fp(), frame->sp(), inlined_function,
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GetApproximateTokenIndex(unoptimized_code, unoptimized_pc),
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true, true);
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}
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}
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// Print the optimized inlining frame below.
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}
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PrintDartFrame(frame->pc(), frame->fp(), frame->sp(), function,
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GetApproximateTokenIndex(code, frame->pc()),
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code.is_optimized(), false);
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} else {
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OS::PrintErr("pc=0x%" Px " fp=0x%" Px " sp=0x%" Px " %s frame\n",
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frame->pc(), frame->fp(), frame->sp(),
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frame->IsEntryFrame()
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? "entry"
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: frame->IsExitFrame()
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? "exit"
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: frame->IsStubFrame() ? "stub" : "invalid");
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}
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frame = frames.NextFrame();
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}
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}
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bool SimulatorDebugger::SetBreakpoint(Instr* breakpc) {
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// Check if a breakpoint can be set. If not return without any side-effects.
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if (sim_->break_pc_ != NULL) {
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return false;
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}
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// Set the breakpoint.
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sim_->break_pc_ = breakpc;
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sim_->break_instr_ = breakpc->InstructionBits();
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// Not setting the breakpoint instruction in the code itself. It will be set
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// when the debugger shell continues.
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return true;
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}
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bool SimulatorDebugger::DeleteBreakpoint(Instr* breakpc) {
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if (sim_->break_pc_ != NULL) {
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sim_->break_pc_->SetInstructionBits(sim_->break_instr_);
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}
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sim_->break_pc_ = NULL;
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sim_->break_instr_ = 0;
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return true;
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}
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void SimulatorDebugger::UndoBreakpoints() {
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if (sim_->break_pc_ != NULL) {
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sim_->break_pc_->SetInstructionBits(sim_->break_instr_);
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}
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}
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void SimulatorDebugger::RedoBreakpoints() {
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if (sim_->break_pc_ != NULL) {
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sim_->break_pc_->SetInstructionBits(Instr::kSimulatorBreakpointInstruction);
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}
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}
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void SimulatorDebugger::Debug() {
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intptr_t last_pc = -1;
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bool done = false;
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#define COMMAND_SIZE 63
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#define ARG_SIZE 255
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#define STR(a) #a
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#define XSTR(a) STR(a)
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char cmd[COMMAND_SIZE + 1];
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char arg1[ARG_SIZE + 1];
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char arg2[ARG_SIZE + 1];
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// make sure to have a proper terminating character if reaching the limit
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cmd[COMMAND_SIZE] = 0;
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arg1[ARG_SIZE] = 0;
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arg2[ARG_SIZE] = 0;
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// Undo all set breakpoints while running in the debugger shell. This will
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// make them invisible to all commands.
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UndoBreakpoints();
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while (!done) {
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if (last_pc != sim_->get_pc()) {
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last_pc = sim_->get_pc();
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if (Simulator::IsIllegalAddress(last_pc)) {
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OS::PrintErr("pc is out of bounds: 0x%" Px "\n", last_pc);
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} else {
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if (FLAG_support_disassembler) {
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Disassembler::Disassemble(last_pc, last_pc + Instr::kInstrSize);
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} else {
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OS::PrintErr("Disassembler not supported in this mode.\n");
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}
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}
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}
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char* line = ReadLine("sim> ");
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if (line == NULL) {
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FATAL("ReadLine failed");
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} else {
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// Use sscanf to parse the individual parts of the command line. At the
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// moment no command expects more than two parameters.
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int args = SScanF(line,
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"%" XSTR(COMMAND_SIZE) "s "
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"%" XSTR(ARG_SIZE) "s "
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"%" XSTR(ARG_SIZE) "s",
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cmd, arg1, arg2);
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if ((strcmp(cmd, "h") == 0) || (strcmp(cmd, "help") == 0)) {
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OS::PrintErr(
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"c/cont -- continue execution\n"
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"disasm -- disassemble instrs at current pc location\n"
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" other variants are:\n"
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" disasm <address>\n"
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" disasm <address> <number_of_instructions>\n"
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" by default 10 instrs are disassembled\n"
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"del -- delete breakpoints\n"
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"flags -- print flag values\n"
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"gdb -- transfer control to gdb\n"
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"h/help -- print this help string\n"
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"break <address> -- set break point at specified address\n"
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"p/print <reg or icount or value or *addr> -- print integer\n"
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"pf/printfloat <vreg or *addr> --print float value\n"
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"pd/printdouble <vreg or *addr> -- print double value\n"
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"pq/printquad <vreg or *addr> -- print vector register\n"
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"po/printobject <*reg or *addr> -- print object\n"
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"si/stepi -- single step an instruction\n"
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"trace -- toggle execution tracing mode\n"
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"bt -- print backtrace\n"
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"unstop -- if current pc is a stop instr make it a nop\n"
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"q/quit -- Quit the debugger and exit the program\n");
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} else if ((strcmp(cmd, "quit") == 0) || (strcmp(cmd, "q") == 0)) {
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OS::PrintErr("Quitting\n");
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OS::Exit(0);
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} else if ((strcmp(cmd, "si") == 0) || (strcmp(cmd, "stepi") == 0)) {
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sim_->InstructionDecode(reinterpret_cast<Instr*>(sim_->get_pc()));
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} else if ((strcmp(cmd, "c") == 0) || (strcmp(cmd, "cont") == 0)) {
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// Execute the one instruction we broke at with breakpoints disabled.
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sim_->InstructionDecode(reinterpret_cast<Instr*>(sim_->get_pc()));
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// Leave the debugger shell.
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done = true;
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} else if ((strcmp(cmd, "p") == 0) || (strcmp(cmd, "print") == 0)) {
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if (args == 2) {
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uint64_t value;
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if (strcmp(arg1, "icount") == 0) {
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value = sim_->get_icount();
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OS::PrintErr("icount: %" Pu64 " 0x%" Px64 "\n", value, value);
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} else if (GetValue(arg1, &value)) {
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OS::PrintErr("%s: %" Pu64 " 0x%" Px64 "\n", arg1, value, value);
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} else {
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OS::PrintErr("%s unrecognized\n", arg1);
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}
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} else {
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OS::PrintErr("print <reg or icount or value or *addr>\n");
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}
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} else if ((strcmp(cmd, "pf") == 0) || (strcmp(cmd, "printfloat") == 0)) {
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|
if (args == 2) {
|
|
uint32_t value;
|
|
if (GetSValue(arg1, &value)) {
|
|
float svalue = bit_cast<float, uint32_t>(value);
|
|
OS::PrintErr("%s: %d 0x%x %.8g\n", arg1, value, value, svalue);
|
|
} else {
|
|
OS::PrintErr("%s unrecognized\n", arg1);
|
|
}
|
|
} else {
|
|
OS::PrintErr("printfloat <vreg or *addr>\n");
|
|
}
|
|
} else if ((strcmp(cmd, "pd") == 0) ||
|
|
(strcmp(cmd, "printdouble") == 0)) {
|
|
if (args == 2) {
|
|
uint64_t long_value;
|
|
if (GetDValue(arg1, &long_value)) {
|
|
double dvalue = bit_cast<double, uint64_t>(long_value);
|
|
OS::PrintErr("%s: %" Pu64 " 0x%" Px64 " %.8g\n", arg1, long_value,
|
|
long_value, dvalue);
|
|
} else {
|
|
OS::PrintErr("%s unrecognized\n", arg1);
|
|
}
|
|
} else {
|
|
OS::PrintErr("printdouble <vreg or *addr>\n");
|
|
}
|
|
} else if ((strcmp(cmd, "pq") == 0) || (strcmp(cmd, "printquad") == 0)) {
|
|
if (args == 2) {
|
|
simd_value_t quad_value;
|
|
if (GetQValue(arg1, &quad_value)) {
|
|
const int64_t d0 = quad_value.bits.i64[0];
|
|
const int64_t d1 = quad_value.bits.i64[1];
|
|
const double dval0 = bit_cast<double, int64_t>(d0);
|
|
const double dval1 = bit_cast<double, int64_t>(d1);
|
|
const int32_t s0 = quad_value.bits.i32[0];
|
|
const int32_t s1 = quad_value.bits.i32[1];
|
|
const int32_t s2 = quad_value.bits.i32[2];
|
|
const int32_t s3 = quad_value.bits.i32[3];
|
|
const float sval0 = bit_cast<float, int32_t>(s0);
|
|
const float sval1 = bit_cast<float, int32_t>(s1);
|
|
const float sval2 = bit_cast<float, int32_t>(s2);
|
|
const float sval3 = bit_cast<float, int32_t>(s3);
|
|
OS::PrintErr("%s: %" Pu64 " 0x%" Px64 " %.8g\n", arg1, d0, d0,
|
|
dval0);
|
|
OS::PrintErr("%s: %" Pu64 " 0x%" Px64 " %.8g\n", arg1, d1, d1,
|
|
dval1);
|
|
OS::PrintErr("%s: %d 0x%x %.8g\n", arg1, s0, s0, sval0);
|
|
OS::PrintErr("%s: %d 0x%x %.8g\n", arg1, s1, s1, sval1);
|
|
OS::PrintErr("%s: %d 0x%x %.8g\n", arg1, s2, s2, sval2);
|
|
OS::PrintErr("%s: %d 0x%x %.8g\n", arg1, s3, s3, sval3);
|
|
} else {
|
|
OS::PrintErr("%s unrecognized\n", arg1);
|
|
}
|
|
} else {
|
|
OS::PrintErr("printquad <vreg or *addr>\n");
|
|
}
|
|
} else if ((strcmp(cmd, "po") == 0) ||
|
|
(strcmp(cmd, "printobject") == 0)) {
|
|
if (args == 2) {
|
|
uint64_t value;
|
|
// Make the dereferencing '*' optional.
|
|
if (((arg1[0] == '*') && GetValue(arg1 + 1, &value)) ||
|
|
GetValue(arg1, &value)) {
|
|
if (Isolate::Current()->heap()->Contains(value)) {
|
|
OS::PrintErr("%s: \n", arg1);
|
|
#if defined(DEBUG)
|
|
const Object& obj =
|
|
Object::Handle(reinterpret_cast<RawObject*>(value));
|
|
obj.Print();
|
|
#endif // defined(DEBUG)
|
|
} else {
|
|
OS::PrintErr("0x%" Px64 " is not an object reference\n", value);
|
|
}
|
|
} else {
|
|
OS::PrintErr("%s unrecognized\n", arg1);
|
|
}
|
|
} else {
|
|
OS::PrintErr("printobject <*reg or *addr>\n");
|
|
}
|
|
} else if (strcmp(cmd, "disasm") == 0) {
|
|
uint64_t start = 0;
|
|
uint64_t end = 0;
|
|
if (args == 1) {
|
|
start = sim_->get_pc();
|
|
end = start + (10 * Instr::kInstrSize);
|
|
} else if (args == 2) {
|
|
if (GetValue(arg1, &start)) {
|
|
// No length parameter passed, assume 10 instructions.
|
|
if (Simulator::IsIllegalAddress(start)) {
|
|
// If start isn't a valid address, warn and use PC instead.
|
|
OS::PrintErr("First argument yields invalid address: 0x%" Px64
|
|
"\n",
|
|
start);
|
|
OS::PrintErr("Using PC instead\n");
|
|
start = sim_->get_pc();
|
|
}
|
|
end = start + (10 * Instr::kInstrSize);
|
|
}
|
|
} else {
|
|
uint64_t length;
|
|
if (GetValue(arg1, &start) && GetValue(arg2, &length)) {
|
|
if (Simulator::IsIllegalAddress(start)) {
|
|
// If start isn't a valid address, warn and use PC instead.
|
|
OS::PrintErr("First argument yields invalid address: 0x%" Px64
|
|
"\n",
|
|
start);
|
|
OS::PrintErr("Using PC instead\n");
|
|
start = sim_->get_pc();
|
|
}
|
|
end = start + (length * Instr::kInstrSize);
|
|
}
|
|
}
|
|
if ((start > 0) && (end > start)) {
|
|
if (FLAG_support_disassembler) {
|
|
Disassembler::Disassemble(start, end);
|
|
} else {
|
|
OS::PrintErr("Disassembler not supported in this mode.\n");
|
|
}
|
|
} else {
|
|
OS::PrintErr("disasm [<address> [<number_of_instructions>]]\n");
|
|
}
|
|
} else if (strcmp(cmd, "gdb") == 0) {
|
|
OS::PrintErr("relinquishing control to gdb\n");
|
|
OS::DebugBreak();
|
|
OS::PrintErr("regaining control from gdb\n");
|
|
} else if (strcmp(cmd, "break") == 0) {
|
|
if (args == 2) {
|
|
uint64_t addr;
|
|
if (GetValue(arg1, &addr)) {
|
|
if (!SetBreakpoint(reinterpret_cast<Instr*>(addr))) {
|
|
OS::PrintErr("setting breakpoint failed\n");
|
|
}
|
|
} else {
|
|
OS::PrintErr("%s unrecognized\n", arg1);
|
|
}
|
|
} else {
|
|
OS::PrintErr("break <addr>\n");
|
|
}
|
|
} else if (strcmp(cmd, "del") == 0) {
|
|
if (!DeleteBreakpoint(NULL)) {
|
|
OS::PrintErr("deleting breakpoint failed\n");
|
|
}
|
|
} else if (strcmp(cmd, "flags") == 0) {
|
|
OS::PrintErr("APSR: ");
|
|
OS::PrintErr("N flag: %d; ", sim_->n_flag_);
|
|
OS::PrintErr("Z flag: %d; ", sim_->z_flag_);
|
|
OS::PrintErr("C flag: %d; ", sim_->c_flag_);
|
|
OS::PrintErr("V flag: %d\n", sim_->v_flag_);
|
|
} else if (strcmp(cmd, "unstop") == 0) {
|
|
intptr_t stop_pc = sim_->get_pc() - Instr::kInstrSize;
|
|
Instr* stop_instr = reinterpret_cast<Instr*>(stop_pc);
|
|
if (stop_instr->IsExceptionGenOp()) {
|
|
stop_instr->SetInstructionBits(Instr::kNopInstruction);
|
|
} else {
|
|
OS::PrintErr("Not at debugger stop.\n");
|
|
}
|
|
} else if (strcmp(cmd, "trace") == 0) {
|
|
if (FLAG_trace_sim_after == ULLONG_MAX) {
|
|
FLAG_trace_sim_after = sim_->get_icount();
|
|
OS::PrintErr("execution tracing on\n");
|
|
} else {
|
|
FLAG_trace_sim_after = ULLONG_MAX;
|
|
OS::PrintErr("execution tracing off\n");
|
|
}
|
|
} else if (strcmp(cmd, "bt") == 0) {
|
|
PrintBacktrace();
|
|
} else {
|
|
OS::PrintErr("Unknown command: %s\n", cmd);
|
|
}
|
|
}
|
|
delete[] line;
|
|
}
|
|
|
|
// 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
|
|
}
|
|
|
|
char* SimulatorDebugger::ReadLine(const char* prompt) {
|
|
char* result = NULL;
|
|
char line_buf[256];
|
|
intptr_t offset = 0;
|
|
bool keep_going = true;
|
|
OS::PrintErr("%s", prompt);
|
|
while (keep_going) {
|
|
if (fgets(line_buf, sizeof(line_buf), stdin) == NULL) {
|
|
// fgets got an error. Just give up.
|
|
if (result != NULL) {
|
|
delete[] result;
|
|
}
|
|
return NULL;
|
|
}
|
|
intptr_t len = strlen(line_buf);
|
|
if (len > 1 && line_buf[len - 2] == '\\' && line_buf[len - 1] == '\n') {
|
|
// When we read a line that ends with a "\" we remove the escape and
|
|
// append the remainder.
|
|
line_buf[len - 2] = '\n';
|
|
line_buf[len - 1] = 0;
|
|
len -= 1;
|
|
} else if ((len > 0) && (line_buf[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.
|
|
keep_going = false;
|
|
}
|
|
if (result == NULL) {
|
|
// Allocate the initial result and make room for the terminating '\0'
|
|
result = new char[len + 1];
|
|
if (result == NULL) {
|
|
// OOM, so cannot readline anymore.
|
|
return NULL;
|
|
}
|
|
} else {
|
|
// Allocate a new result with enough room for the new addition.
|
|
intptr_t new_len = offset + len + 1;
|
|
char* new_result = new char[new_len];
|
|
if (new_result == NULL) {
|
|
// OOM, free the buffer allocated so far and return NULL.
|
|
delete[] result;
|
|
return NULL;
|
|
} else {
|
|
// Copy the existing input into the new array and set the new
|
|
// array as the result.
|
|
memmove(new_result, result, offset);
|
|
delete[] result;
|
|
result = new_result;
|
|
}
|
|
}
|
|
// Copy the newly read line into the result.
|
|
memmove(result + offset, line_buf, len);
|
|
offset += len;
|
|
}
|
|
ASSERT(result != NULL);
|
|
result[offset] = '\0';
|
|
return result;
|
|
}
|
|
|
|
void Simulator::Init() {}
|
|
|
|
Simulator::Simulator() : exclusive_access_addr_(0), exclusive_access_value_(0) {
|
|
// Setup simulator support first. Some of this information is needed to
|
|
// setup the architecture state.
|
|
// We allocate the stack here, the size is computed as the sum of
|
|
// the size specified by the user and the buffer space needed for
|
|
// handling stack overflow exceptions. To be safe in potential
|
|
// stack underflows we also add some underflow buffer space.
|
|
stack_ =
|
|
new char[(OSThread::GetSpecifiedStackSize() +
|
|
OSThread::kStackSizeBufferMax + kSimulatorStackUnderflowSize)];
|
|
// Low address.
|
|
stack_limit_ = reinterpret_cast<uword>(stack_);
|
|
// Limit for StackOverflowError.
|
|
overflow_stack_limit_ = stack_limit_ + OSThread::kStackSizeBufferMax;
|
|
// High address.
|
|
stack_base_ = overflow_stack_limit_ + OSThread::GetSpecifiedStackSize();
|
|
|
|
pc_modified_ = false;
|
|
icount_ = 0;
|
|
break_pc_ = NULL;
|
|
break_instr_ = 0;
|
|
last_setjmp_buffer_ = NULL;
|
|
|
|
// Setup architecture state.
|
|
// All registers are initialized to zero to start with.
|
|
for (int i = 0; i < kNumberOfCpuRegisters; i++) {
|
|
registers_[i] = 0;
|
|
}
|
|
n_flag_ = false;
|
|
z_flag_ = false;
|
|
c_flag_ = false;
|
|
v_flag_ = false;
|
|
|
|
for (int i = 0; i < kNumberOfVRegisters; i++) {
|
|
vregisters_[i].bits.i64[0] = 0;
|
|
vregisters_[i].bits.i64[1] = 0;
|
|
}
|
|
|
|
// The sp is initialized to point to the bottom (high address) of the
|
|
// allocated stack area.
|
|
registers_[R31] = stack_base();
|
|
// The lr and pc are initialized to a known bad value that will cause an
|
|
// access violation if the simulator ever tries to execute it.
|
|
registers_[LR] = kBadLR;
|
|
pc_ = kBadLR;
|
|
}
|
|
|
|
Simulator::~Simulator() {
|
|
delete[] stack_;
|
|
Isolate* isolate = Isolate::Current();
|
|
if (isolate != NULL) {
|
|
isolate->set_simulator(NULL);
|
|
}
|
|
}
|
|
|
|
// 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 svc (supervisor call) instruction that is handled by
|
|
// the simulator. We write the original destination of the jump just at a known
|
|
// offset from the svc instruction so the simulator knows what to call.
|
|
class Redirection {
|
|
public:
|
|
uword address_of_hlt_instruction() {
|
|
return reinterpret_cast<uword>(&hlt_instruction_);
|
|
}
|
|
|
|
uword external_function() const { return external_function_; }
|
|
|
|
Simulator::CallKind call_kind() const { return call_kind_; }
|
|
|
|
int argument_count() const { return argument_count_; }
|
|
|
|
static Redirection* Get(uword external_function,
|
|
Simulator::CallKind call_kind,
|
|
int argument_count) {
|
|
MutexLocker ml(mutex_);
|
|
|
|
for (Redirection* current = list_; current != NULL;
|
|
current = current->next_) {
|
|
if (current->external_function_ == external_function) return current;
|
|
}
|
|
|
|
Redirection* redirection =
|
|
new Redirection(external_function, call_kind, argument_count);
|
|
redirection->next_ = list_;
|
|
|
|
// Use a memory fence to ensure all pending writes are written at the time
|
|
// of updating the list head, so the profiling thread always has a valid
|
|
// list to look at.
|
|
Redirection* old_head = list_;
|
|
Redirection* replaced_list_head =
|
|
AtomicOperations::CompareAndSwapPointer<Redirection>(&list_, old_head,
|
|
redirection);
|
|
ASSERT(old_head == replaced_list_head);
|
|
|
|
return redirection;
|
|
}
|
|
|
|
static Redirection* FromHltInstruction(Instr* hlt_instruction) {
|
|
char* addr_of_hlt = reinterpret_cast<char*>(hlt_instruction);
|
|
char* addr_of_redirection =
|
|
addr_of_hlt - OFFSET_OF(Redirection, hlt_instruction_);
|
|
return reinterpret_cast<Redirection*>(addr_of_redirection);
|
|
}
|
|
|
|
// Please note that this function is called by the signal handler of the
|
|
// profiling thread. It can therefore run at any point in time and is not
|
|
// allowed to hold any locks - which is precisely the reason why the list is
|
|
// prepend-only and a memory fence is used when writing the list head [list_]!
|
|
static uword FunctionForRedirect(uword address_of_hlt) {
|
|
Redirection* current;
|
|
for (current = list_; current != NULL; current = current->next_) {
|
|
if (current->address_of_hlt_instruction() == address_of_hlt) {
|
|
return current->external_function_;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
private:
|
|
Redirection(uword external_function,
|
|
Simulator::CallKind call_kind,
|
|
int argument_count)
|
|
: external_function_(external_function),
|
|
call_kind_(call_kind),
|
|
argument_count_(argument_count),
|
|
hlt_instruction_(Instr::kSimulatorRedirectInstruction),
|
|
next_(NULL) {}
|
|
|
|
uword external_function_;
|
|
Simulator::CallKind call_kind_;
|
|
int argument_count_;
|
|
uint32_t hlt_instruction_;
|
|
Redirection* next_;
|
|
static Redirection* list_;
|
|
static Mutex* mutex_;
|
|
};
|
|
|
|
Redirection* Redirection::list_ = NULL;
|
|
Mutex* Redirection::mutex_ = new Mutex();
|
|
|
|
uword Simulator::RedirectExternalReference(uword function,
|
|
CallKind call_kind,
|
|
int argument_count) {
|
|
Redirection* redirection =
|
|
Redirection::Get(function, call_kind, argument_count);
|
|
return redirection->address_of_hlt_instruction();
|
|
}
|
|
|
|
uword Simulator::FunctionForRedirect(uword redirect) {
|
|
return Redirection::FunctionForRedirect(redirect);
|
|
}
|
|
|
|
// Get the active Simulator for the current isolate.
|
|
Simulator* Simulator::Current() {
|
|
Isolate* isolate = Isolate::Current();
|
|
Simulator* simulator = isolate->simulator();
|
|
if (simulator == NULL) {
|
|
NoSafepointScope no_safepoint;
|
|
simulator = new Simulator();
|
|
isolate->set_simulator(simulator);
|
|
}
|
|
return simulator;
|
|
}
|
|
|
|
// Sets the register in the architecture state.
|
|
void Simulator::set_register(Instr* instr,
|
|
Register reg,
|
|
int64_t value,
|
|
R31Type r31t) {
|
|
// Register is in range.
|
|
ASSERT((reg >= 0) && (reg < kNumberOfCpuRegisters));
|
|
ASSERT(instr == NULL || reg != R18); // R18 is globally reserved on iOS.
|
|
if ((reg != R31) || (r31t != R31IsZR)) {
|
|
registers_[reg] = value;
|
|
// If we're setting CSP, make sure it is 16-byte aligned. In truth, CSP
|
|
// can store addresses that are not 16-byte aligned, but loads and stores
|
|
// are not allowed through CSP when it is not aligned. Thus, this check is
|
|
// more conservative that necessary. However, it will likely be more
|
|
// useful to find the program locations where CSP is set to a bad value,
|
|
// than to find only the resulting loads/stores that would cause a fault on
|
|
// hardware.
|
|
if ((instr != NULL) && (reg == R31) && !Utils::IsAligned(value, 16)) {
|
|
UnalignedAccess("CSP set", value, instr);
|
|
}
|
|
}
|
|
}
|
|
|
|
// Get the register from the architecture state.
|
|
int64_t Simulator::get_register(Register reg, R31Type r31t) const {
|
|
ASSERT((reg >= 0) && (reg < kNumberOfCpuRegisters));
|
|
if ((reg == R31) && (r31t == R31IsZR)) {
|
|
return 0;
|
|
} else {
|
|
return registers_[reg];
|
|
}
|
|
}
|
|
|
|
void Simulator::set_wregister(Register reg, int32_t value, R31Type r31t) {
|
|
ASSERT((reg >= 0) && (reg < kNumberOfCpuRegisters));
|
|
// When setting in W mode, clear the high bits.
|
|
if ((reg != R31) || (r31t != R31IsZR)) {
|
|
registers_[reg] = Utils::LowHighTo64Bits(static_cast<uint32_t>(value), 0);
|
|
}
|
|
}
|
|
|
|
// Get the register from the architecture state.
|
|
int32_t Simulator::get_wregister(Register reg, R31Type r31t) const {
|
|
ASSERT((reg >= 0) && (reg < kNumberOfCpuRegisters));
|
|
if ((reg == R31) && (r31t == R31IsZR)) {
|
|
return 0;
|
|
} else {
|
|
return static_cast<int32_t>(registers_[reg]);
|
|
}
|
|
}
|
|
|
|
int32_t Simulator::get_vregisters(VRegister reg, int idx) const {
|
|
ASSERT((reg >= 0) && (reg < kNumberOfVRegisters));
|
|
ASSERT((idx >= 0) && (idx <= 3));
|
|
return vregisters_[reg].bits.i32[idx];
|
|
}
|
|
|
|
void Simulator::set_vregisters(VRegister reg, int idx, int32_t value) {
|
|
ASSERT((reg >= 0) && (reg < kNumberOfVRegisters));
|
|
ASSERT((idx >= 0) && (idx <= 3));
|
|
vregisters_[reg].bits.i32[idx] = value;
|
|
}
|
|
|
|
int64_t Simulator::get_vregisterd(VRegister reg, int idx) const {
|
|
ASSERT((reg >= 0) && (reg < kNumberOfVRegisters));
|
|
ASSERT((idx == 0) || (idx == 1));
|
|
return vregisters_[reg].bits.i64[idx];
|
|
}
|
|
|
|
void Simulator::set_vregisterd(VRegister reg, int idx, int64_t value) {
|
|
ASSERT((reg >= 0) && (reg < kNumberOfVRegisters));
|
|
ASSERT((idx == 0) || (idx == 1));
|
|
vregisters_[reg].bits.i64[idx] = value;
|
|
}
|
|
|
|
void Simulator::get_vregister(VRegister reg, simd_value_t* value) const {
|
|
ASSERT((reg >= 0) && (reg < kNumberOfVRegisters));
|
|
value->bits.i64[0] = vregisters_[reg].bits.i64[0];
|
|
value->bits.i64[1] = vregisters_[reg].bits.i64[1];
|
|
}
|
|
|
|
void Simulator::set_vregister(VRegister reg, const simd_value_t& value) {
|
|
ASSERT((reg >= 0) && (reg < kNumberOfVRegisters));
|
|
vregisters_[reg].bits.i64[0] = value.bits.i64[0];
|
|
vregisters_[reg].bits.i64[1] = value.bits.i64[1];
|
|
}
|
|
|
|
// Raw access to the PC register.
|
|
void Simulator::set_pc(int64_t value) {
|
|
pc_modified_ = true;
|
|
last_pc_ = pc_;
|
|
pc_ = value;
|
|
}
|
|
|
|
// Raw access to the pc.
|
|
int64_t Simulator::get_pc() const {
|
|
return pc_;
|
|
}
|
|
|
|
int64_t Simulator::get_last_pc() const {
|
|
return last_pc_;
|
|
}
|
|
|
|
void Simulator::HandleIllegalAccess(uword addr, Instr* instr) {
|
|
uword fault_pc = get_pc();
|
|
uword last_pc = get_last_pc();
|
|
char buffer[128];
|
|
snprintf(buffer, sizeof(buffer),
|
|
"illegal memory access at 0x%" Px ", pc=0x%" Px ", last_pc=0x%" Px
|
|
"\n",
|
|
addr, fault_pc, last_pc);
|
|
SimulatorDebugger dbg(this);
|
|
dbg.Stop(instr, buffer);
|
|
// The debugger will return control in non-interactive mode.
|
|
FATAL("Cannot continue execution after illegal memory access.");
|
|
}
|
|
|
|
// The ARMv8 manual advises that an unaligned access may generate a fault,
|
|
// and if not, will likely take a number of additional cycles to execute,
|
|
// so let's just not generate any.
|
|
void Simulator::UnalignedAccess(const char* msg, uword addr, Instr* instr) {
|
|
char buffer[128];
|
|
snprintf(buffer, sizeof(buffer), "unaligned %s at 0x%" Px ", pc=%p\n", msg,
|
|
addr, instr);
|
|
SimulatorDebugger dbg(this);
|
|
dbg.Stop(instr, buffer);
|
|
// The debugger will not be able to single step past this instruction, but
|
|
// it will be possible to disassemble the code and inspect registers.
|
|
FATAL("Cannot continue execution after unaligned access.");
|
|
}
|
|
|
|
void Simulator::UnimplementedInstruction(Instr* instr) {
|
|
char buffer[128];
|
|
snprintf(buffer, sizeof(buffer),
|
|
"Unimplemented instruction: at %p, last_pc=0x%" Px64 "\n", instr,
|
|
get_last_pc());
|
|
SimulatorDebugger dbg(this);
|
|
dbg.Stop(instr, buffer);
|
|
FATAL("Cannot continue execution after unimplemented instruction.");
|
|
}
|
|
|
|
bool Simulator::IsTracingExecution() const {
|
|
return icount_ > FLAG_trace_sim_after;
|
|
}
|
|
|
|
intptr_t Simulator::ReadX(uword addr, Instr* instr) {
|
|
if ((addr & 7) == 0) {
|
|
intptr_t* ptr = reinterpret_cast<intptr_t*>(addr);
|
|
return *ptr;
|
|
}
|
|
UnalignedAccess("read", addr, instr);
|
|
return 0;
|
|
}
|
|
|
|
void Simulator::WriteX(uword addr, intptr_t value, Instr* instr) {
|
|
if ((addr & 7) == 0) {
|
|
intptr_t* ptr = reinterpret_cast<intptr_t*>(addr);
|
|
*ptr = value;
|
|
return;
|
|
}
|
|
UnalignedAccess("write", addr, instr);
|
|
}
|
|
|
|
uint32_t Simulator::ReadWU(uword addr, Instr* instr) {
|
|
if ((addr & 3) == 0) {
|
|
uint32_t* ptr = reinterpret_cast<uint32_t*>(addr);
|
|
return *ptr;
|
|
}
|
|
UnalignedAccess("read unsigned single word", addr, instr);
|
|
return 0;
|
|
}
|
|
|
|
int32_t Simulator::ReadW(uword addr, Instr* instr) {
|
|
if ((addr & 3) == 0) {
|
|
int32_t* ptr = reinterpret_cast<int32_t*>(addr);
|
|
return *ptr;
|
|
}
|
|
UnalignedAccess("read single word", addr, instr);
|
|
return 0;
|
|
}
|
|
|
|
void Simulator::WriteW(uword addr, uint32_t value, Instr* instr) {
|
|
if ((addr & 3) == 0) {
|
|
uint32_t* ptr = reinterpret_cast<uint32_t*>(addr);
|
|
*ptr = value;
|
|
return;
|
|
}
|
|
UnalignedAccess("write single word", addr, instr);
|
|
}
|
|
|
|
uint16_t Simulator::ReadHU(uword addr, Instr* instr) {
|
|
if ((addr & 1) == 0) {
|
|
uint16_t* ptr = reinterpret_cast<uint16_t*>(addr);
|
|
return *ptr;
|
|
}
|
|
UnalignedAccess("unsigned halfword read", addr, instr);
|
|
return 0;
|
|
}
|
|
|
|
int16_t Simulator::ReadH(uword addr, Instr* instr) {
|
|
if ((addr & 1) == 0) {
|
|
int16_t* ptr = reinterpret_cast<int16_t*>(addr);
|
|
return *ptr;
|
|
}
|
|
UnalignedAccess("signed halfword read", addr, instr);
|
|
return 0;
|
|
}
|
|
|
|
void Simulator::WriteH(uword addr, uint16_t value, Instr* instr) {
|
|
if ((addr & 1) == 0) {
|
|
uint16_t* ptr = reinterpret_cast<uint16_t*>(addr);
|
|
*ptr = value;
|
|
return;
|
|
}
|
|
UnalignedAccess("halfword write", addr, instr);
|
|
}
|
|
|
|
uint8_t Simulator::ReadBU(uword addr) {
|
|
uint8_t* ptr = reinterpret_cast<uint8_t*>(addr);
|
|
return *ptr;
|
|
}
|
|
|
|
int8_t Simulator::ReadB(uword addr) {
|
|
int8_t* ptr = reinterpret_cast<int8_t*>(addr);
|
|
return *ptr;
|
|
}
|
|
|
|
void Simulator::WriteB(uword addr, uint8_t value) {
|
|
uint8_t* ptr = reinterpret_cast<uint8_t*>(addr);
|
|
*ptr = value;
|
|
}
|
|
|
|
void Simulator::ClearExclusive() {
|
|
exclusive_access_addr_ = 0;
|
|
exclusive_access_value_ = 0;
|
|
}
|
|
|
|
intptr_t Simulator::ReadExclusiveX(uword addr, Instr* instr) {
|
|
exclusive_access_addr_ = addr;
|
|
exclusive_access_value_ = ReadX(addr, instr);
|
|
return exclusive_access_value_;
|
|
}
|
|
|
|
intptr_t Simulator::ReadExclusiveW(uword addr, Instr* instr) {
|
|
exclusive_access_addr_ = addr;
|
|
exclusive_access_value_ = ReadWU(addr, instr);
|
|
return exclusive_access_value_;
|
|
}
|
|
|
|
intptr_t Simulator::WriteExclusiveX(uword addr, intptr_t value, Instr* instr) {
|
|
// In a well-formed code store-exclusive instruction should always follow
|
|
// a corresponding load-exclusive instruction with the same address.
|
|
ASSERT((exclusive_access_addr_ == 0) || (exclusive_access_addr_ == addr));
|
|
if (exclusive_access_addr_ != addr) {
|
|
return 1; // Failure.
|
|
}
|
|
|
|
uword old_value = exclusive_access_value_;
|
|
ClearExclusive();
|
|
|
|
if (AtomicOperations::CompareAndSwapWord(reinterpret_cast<uword*>(addr),
|
|
old_value, value) == old_value) {
|
|
return 0; // Success.
|
|
}
|
|
return 1; // Failure.
|
|
}
|
|
|
|
intptr_t Simulator::WriteExclusiveW(uword addr, intptr_t value, Instr* instr) {
|
|
// In a well-formed code store-exclusive instruction should always follow
|
|
// a corresponding load-exclusive instruction with the same address.
|
|
ASSERT((exclusive_access_addr_ == 0) || (exclusive_access_addr_ == addr));
|
|
if (exclusive_access_addr_ != addr) {
|
|
return 1; // Failure.
|
|
}
|
|
|
|
uint32_t old_value = static_cast<uint32_t>(exclusive_access_value_);
|
|
ClearExclusive();
|
|
|
|
if (AtomicOperations::CompareAndSwapUint32(reinterpret_cast<uint32_t*>(addr),
|
|
old_value, value) == old_value) {
|
|
return 0; // Success.
|
|
}
|
|
return 1; // Failure.
|
|
}
|
|
|
|
// Unsupported instructions use Format to print an error and stop execution.
|
|
void Simulator::Format(Instr* instr, const char* format) {
|
|
OS::PrintErr("Simulator found unsupported instruction:\n 0x%p: %s\n", instr,
|
|
format);
|
|
UNIMPLEMENTED();
|
|
}
|
|
|
|
// Calculate and set the Negative and Zero flags.
|
|
void Simulator::SetNZFlagsW(int32_t val) {
|
|
n_flag_ = (val < 0);
|
|
z_flag_ = (val == 0);
|
|
}
|
|
|
|
// Calculate C flag value for additions (and subtractions with adjusted args).
|
|
bool Simulator::CarryFromW(int32_t left, int32_t right, int32_t carry) {
|
|
uint64_t uleft = static_cast<uint32_t>(left);
|
|
uint64_t uright = static_cast<uint32_t>(right);
|
|
uint64_t ucarry = static_cast<uint32_t>(carry);
|
|
return ((uleft + uright + ucarry) >> 32) != 0;
|
|
}
|
|
|
|
// Calculate V flag value for additions (and subtractions with adjusted args).
|
|
bool Simulator::OverflowFromW(int32_t left, int32_t right, int32_t carry) {
|
|
int64_t result = static_cast<int64_t>(left) + right + carry;
|
|
return (result >> 31) != (result >> 32);
|
|
}
|
|
|
|
// Calculate and set the Negative and Zero flags.
|
|
void Simulator::SetNZFlagsX(int64_t val) {
|
|
n_flag_ = (val < 0);
|
|
z_flag_ = (val == 0);
|
|
}
|
|
|
|
// Calculate C flag value for additions and subtractions.
|
|
bool Simulator::CarryFromX(int64_t alu_out,
|
|
int64_t left,
|
|
int64_t right,
|
|
bool addition) {
|
|
if (addition) {
|
|
return (((left & right) | ((left | right) & ~alu_out)) >> 63) != 0;
|
|
} else {
|
|
return (((~left & right) | ((~left | right) & alu_out)) >> 63) == 0;
|
|
}
|
|
}
|
|
|
|
// Calculate V flag value for additions and subtractions.
|
|
bool Simulator::OverflowFromX(int64_t alu_out,
|
|
int64_t left,
|
|
int64_t right,
|
|
bool addition) {
|
|
if (addition) {
|
|
return (((alu_out ^ left) & (alu_out ^ right)) >> 63) != 0;
|
|
} else {
|
|
return (((left ^ right) & (alu_out ^ left)) >> 63) != 0;
|
|
}
|
|
}
|
|
|
|
// Set the Carry flag.
|
|
void Simulator::SetCFlag(bool val) {
|
|
c_flag_ = val;
|
|
}
|
|
|
|
// Set the oVerflow flag.
|
|
void Simulator::SetVFlag(bool val) {
|
|
v_flag_ = val;
|
|
}
|
|
|
|
void Simulator::DecodeMoveWide(Instr* instr) {
|
|
const Register rd = instr->RdField();
|
|
const int hw = instr->HWField();
|
|
const int64_t shift = hw << 4;
|
|
const int64_t shifted_imm = static_cast<int64_t>(instr->Imm16Field())
|
|
<< shift;
|
|
|
|
if (instr->SFField()) {
|
|
if (instr->Bits(29, 2) == 0) {
|
|
// Format(instr, "movn'sf 'rd, 'imm16 'hw");
|
|
set_register(instr, rd, ~shifted_imm, instr->RdMode());
|
|
} else if (instr->Bits(29, 2) == 2) {
|
|
// Format(instr, "movz'sf 'rd, 'imm16 'hw");
|
|
set_register(instr, rd, shifted_imm, instr->RdMode());
|
|
} else if (instr->Bits(29, 2) == 3) {
|
|
// Format(instr, "movk'sf 'rd, 'imm16 'hw");
|
|
const int64_t rd_val = get_register(rd, instr->RdMode());
|
|
const int64_t result = (rd_val & ~(0xffffL << shift)) | shifted_imm;
|
|
set_register(instr, rd, result, instr->RdMode());
|
|
} else {
|
|
UnimplementedInstruction(instr);
|
|
}
|
|
} else if ((hw & 0x2) == 0) {
|
|
if (instr->Bits(29, 2) == 0) {
|
|
// Format(instr, "movn'sf 'rd, 'imm16 'hw");
|
|
set_wregister(rd, ~shifted_imm & kWRegMask, instr->RdMode());
|
|
} else if (instr->Bits(29, 2) == 2) {
|
|
// Format(instr, "movz'sf 'rd, 'imm16 'hw");
|
|
set_wregister(rd, shifted_imm & kWRegMask, instr->RdMode());
|
|
} else if (instr->Bits(29, 2) == 3) {
|
|
// Format(instr, "movk'sf 'rd, 'imm16 'hw");
|
|
const int32_t rd_val = get_wregister(rd, instr->RdMode());
|
|
const int32_t result = (rd_val & ~(0xffffL << shift)) | shifted_imm;
|
|
set_wregister(rd, result, instr->RdMode());
|
|
} else {
|
|
UnimplementedInstruction(instr);
|
|
}
|
|
} else {
|
|
// Dest is 32 bits, but shift is more than 32.
|
|
UnimplementedInstruction(instr);
|
|
}
|
|
}
|
|
|
|
void Simulator::DecodeAddSubImm(Instr* instr) {
|
|
const bool addition = (instr->Bit(30) == 0);
|
|
// Format(instr, "addi'sf's 'rd, 'rn, 'imm12s");
|
|
// Format(instr, "subi'sf's 'rd, 'rn, 'imm12s");
|
|
const Register rd = instr->RdField();
|
|
const Register rn = instr->RnField();
|
|
uint32_t imm = (instr->Bit(22) == 1) ? (instr->Imm12Field() << 12)
|
|
: (instr->Imm12Field());
|
|
if (instr->SFField()) {
|
|
// 64-bit add.
|
|
const int64_t rn_val = get_register(rn, instr->RnMode());
|
|
const int64_t alu_out = addition ? (rn_val + imm) : (rn_val - imm);
|
|
set_register(instr, rd, alu_out, instr->RdMode());
|
|
if (instr->HasS()) {
|
|
SetNZFlagsX(alu_out);
|
|
SetCFlag(CarryFromX(alu_out, rn_val, imm, addition));
|
|
SetVFlag(OverflowFromX(alu_out, rn_val, imm, addition));
|
|
}
|
|
} else {
|
|
// 32-bit add.
|
|
const int32_t rn_val = get_wregister(rn, instr->RnMode());
|
|
int32_t carry_in = 0;
|
|
if (!addition) {
|
|
carry_in = 1;
|
|
imm = ~imm;
|
|
}
|
|
const int32_t alu_out = rn_val + imm + carry_in;
|
|
set_wregister(rd, alu_out, instr->RdMode());
|
|
if (instr->HasS()) {
|
|
SetNZFlagsW(alu_out);
|
|
SetCFlag(CarryFromW(rn_val, imm, carry_in));
|
|
SetVFlag(OverflowFromW(rn_val, imm, carry_in));
|
|
}
|
|
}
|
|
}
|
|
|
|
void Simulator::DecodeBitfield(Instr* instr) {
|
|
int bitwidth = instr->SFField() == 0 ? 32 : 64;
|
|
unsigned op = instr->Bits(29, 2);
|
|
ASSERT(op <= 2);
|
|
bool sign_extend = op == 0;
|
|
bool zero_extend = op == 2;
|
|
ASSERT(instr->NField() == instr->SFField());
|
|
const Register rn = instr->RnField();
|
|
const Register rd = instr->RdField();
|
|
int64_t result = get_register(rn, instr->RnMode());
|
|
int r_bit = instr->ImmRField();
|
|
int s_bit = instr->ImmSField();
|
|
result &= Utils::NBitMask(bitwidth);
|
|
ASSERT(s_bit < bitwidth && r_bit < bitwidth);
|
|
// See ARM v8 Instruction set overview 5.4.5.
|
|
// If s >= r then Rd[s-r:0] := Rn[s:r], else Rd[bitwidth+s-r:bitwidth-r] :=
|
|
// Rn[s:0].
|
|
uword mask = Utils::NBitMask(s_bit + 1);
|
|
if (s_bit >= r_bit) {
|
|
mask >>= r_bit;
|
|
result >>= r_bit;
|
|
} else {
|
|
result <<= bitwidth - r_bit;
|
|
mask <<= bitwidth - r_bit;
|
|
}
|
|
result &= mask;
|
|
if (sign_extend) {
|
|
int highest_bit = (s_bit - r_bit) & (bitwidth - 1);
|
|
int shift = bitwidth - highest_bit - 1;
|
|
result <<= shift;
|
|
result = static_cast<word>(result) >> shift;
|
|
} else if (!zero_extend) {
|
|
const int64_t rd_val = get_register(rd, instr->RnMode());
|
|
result |= rd_val & ~mask;
|
|
}
|
|
if (bitwidth == 64) {
|
|
set_register(instr, rd, result, instr->RdMode());
|
|
} else {
|
|
set_wregister(rd, result, instr->RdMode());
|
|
}
|
|
}
|
|
|
|
void Simulator::DecodeLogicalImm(Instr* instr) {
|
|
const int op = instr->Bits(29, 2);
|
|
const bool set_flags = op == 3;
|
|
const int out_size = ((instr->SFField() == 0) && (instr->NField() == 0))
|
|
? kWRegSizeInBits
|
|
: kXRegSizeInBits;
|
|
const Register rn = instr->RnField();
|
|
const Register rd = instr->RdField();
|
|
const int64_t rn_val = get_register(rn, instr->RnMode());
|
|
const uint64_t imm = instr->ImmLogical();
|
|
if (imm == 0) {
|
|
UnimplementedInstruction(instr);
|
|
}
|
|
|
|
int64_t alu_out = 0;
|
|
switch (op) {
|
|
case 0:
|
|
alu_out = rn_val & imm;
|
|
break;
|
|
case 1:
|
|
alu_out = rn_val | imm;
|
|
break;
|
|
case 2:
|
|
alu_out = rn_val ^ imm;
|
|
break;
|
|
case 3:
|
|
alu_out = rn_val & imm;
|
|
break;
|
|
default:
|
|
UNREACHABLE();
|
|
break;
|
|
}
|
|
|
|
if (set_flags) {
|
|
if (out_size == kXRegSizeInBits) {
|
|
SetNZFlagsX(alu_out);
|
|
} else {
|
|
SetNZFlagsW(alu_out);
|
|
}
|
|
SetCFlag(false);
|
|
SetVFlag(false);
|
|
}
|
|
|
|
if (out_size == kXRegSizeInBits) {
|
|
set_register(instr, rd, alu_out, instr->RdMode());
|
|
} else {
|
|
set_wregister(rd, alu_out, instr->RdMode());
|
|
}
|
|
}
|
|
|
|
void Simulator::DecodePCRel(Instr* instr) {
|
|
const int op = instr->Bit(31);
|
|
if (op == 0) {
|
|
// Format(instr, "adr 'rd, 'pcrel")
|
|
const Register rd = instr->RdField();
|
|
const int64_t immhi = instr->SImm19Field();
|
|
const int64_t immlo = instr->Bits(29, 2);
|
|
const int64_t off = (immhi << 2) | immlo;
|
|
const int64_t dest = get_pc() + off;
|
|
set_register(instr, rd, dest, instr->RdMode());
|
|
} else {
|
|
UnimplementedInstruction(instr);
|
|
}
|
|
}
|
|
|
|
void Simulator::DecodeDPImmediate(Instr* instr) {
|
|
if (instr->IsMoveWideOp()) {
|
|
DecodeMoveWide(instr);
|
|
} else if (instr->IsAddSubImmOp()) {
|
|
DecodeAddSubImm(instr);
|
|
} else if (instr->IsBitfieldOp()) {
|
|
DecodeBitfield(instr);
|
|
} else if (instr->IsLogicalImmOp()) {
|
|
DecodeLogicalImm(instr);
|
|
} else if (instr->IsPCRelOp()) {
|
|
DecodePCRel(instr);
|
|
} else {
|
|
UnimplementedInstruction(instr);
|
|
}
|
|
}
|
|
|
|
void Simulator::DecodeCompareAndBranch(Instr* instr) {
|
|
const int op = instr->Bit(24);
|
|
const Register rt = instr->RtField();
|
|
const int64_t imm19 = instr->SImm19Field();
|
|
const int64_t dest = get_pc() + (imm19 << 2);
|
|
const int64_t mask = instr->SFField() == 1 ? kXRegMask : kWRegMask;
|
|
const int64_t rt_val = get_register(rt, R31IsZR) & mask;
|
|
if (op == 0) {
|
|
// Format(instr, "cbz'sf 'rt, 'dest19");
|
|
if (rt_val == 0) {
|
|
set_pc(dest);
|
|
}
|
|
} else {
|
|
// Format(instr, "cbnz'sf 'rt, 'dest19");
|
|
if (rt_val != 0) {
|
|
set_pc(dest);
|
|
}
|
|
}
|
|
}
|
|
|
|
bool Simulator::ConditionallyExecute(Instr* instr) {
|
|
Condition cond;
|
|
if (instr->IsConditionalSelectOp()) {
|
|
cond = instr->SelectConditionField();
|
|
} else {
|
|
cond = instr->ConditionField();
|
|
}
|
|
switch (cond) {
|
|
case EQ:
|
|
return z_flag_;
|
|
case NE:
|
|
return !z_flag_;
|
|
case CS:
|
|
return c_flag_;
|
|
case CC:
|
|
return !c_flag_;
|
|
case MI:
|
|
return n_flag_;
|
|
case PL:
|
|
return !n_flag_;
|
|
case VS:
|
|
return v_flag_;
|
|
case VC:
|
|
return !v_flag_;
|
|
case HI:
|
|
return c_flag_ && !z_flag_;
|
|
case LS:
|
|
return !c_flag_ || z_flag_;
|
|
case GE:
|
|
return n_flag_ == v_flag_;
|
|
case LT:
|
|
return n_flag_ != v_flag_;
|
|
case GT:
|
|
return !z_flag_ && (n_flag_ == v_flag_);
|
|
case LE:
|
|
return z_flag_ || (n_flag_ != v_flag_);
|
|
case AL:
|
|
return true;
|
|
default:
|
|
UNREACHABLE();
|
|
}
|
|
return false;
|
|
}
|
|
|
|
void Simulator::DecodeConditionalBranch(Instr* instr) {
|
|
// Format(instr, "b'cond 'dest19");
|
|
if ((instr->Bit(24) != 0) || (instr->Bit(4) != 0)) {
|
|
UnimplementedInstruction(instr);
|
|
}
|
|
const int64_t imm19 = instr->SImm19Field();
|
|
const int64_t dest = get_pc() + (imm19 << 2);
|
|
if (ConditionallyExecute(instr)) {
|
|
set_pc(dest);
|
|
}
|
|
}
|
|
|
|
// Calls into the Dart runtime are based on this interface.
|
|
typedef void (*SimulatorRuntimeCall)(NativeArguments arguments);
|
|
|
|
// Calls to leaf Dart runtime functions are based on this interface.
|
|
typedef int64_t (*SimulatorLeafRuntimeCall)(int64_t r0,
|
|
int64_t r1,
|
|
int64_t r2,
|
|
int64_t r3,
|
|
int64_t r4,
|
|
int64_t r5,
|
|
int64_t r6,
|
|
int64_t r7);
|
|
|
|
// Calls to leaf float Dart runtime functions are based on this interface.
|
|
typedef double (*SimulatorLeafFloatRuntimeCall)(double d0,
|
|
double d1,
|
|
double d2,
|
|
double d3,
|
|
double d4,
|
|
double d5,
|
|
double d6,
|
|
double d7);
|
|
|
|
// Calls to native Dart functions are based on this interface.
|
|
typedef void (*SimulatorBootstrapNativeCall)(NativeArguments* arguments);
|
|
typedef void (*SimulatorNativeCall)(NativeArguments* arguments, uword target);
|
|
|
|
void Simulator::DoRedirectedCall(Instr* instr) {
|
|
SimulatorSetjmpBuffer buffer(this);
|
|
if (!setjmp(buffer.buffer_)) {
|
|
int64_t saved_lr = get_register(LR);
|
|
Redirection* redirection = Redirection::FromHltInstruction(instr);
|
|
uword external = redirection->external_function();
|
|
if (IsTracingExecution()) {
|
|
THR_Print("Call to host function at 0x%" Pd "\n", external);
|
|
}
|
|
|
|
if (redirection->call_kind() == kRuntimeCall) {
|
|
NativeArguments* arguments =
|
|
reinterpret_cast<NativeArguments*>(get_register(R0));
|
|
SimulatorRuntimeCall target =
|
|
reinterpret_cast<SimulatorRuntimeCall>(external);
|
|
target(*arguments);
|
|
// Zap result register from void function.
|
|
set_register(instr, R0, icount_);
|
|
set_register(instr, R1, icount_);
|
|
} else if (redirection->call_kind() == kLeafRuntimeCall) {
|
|
ASSERT((0 <= redirection->argument_count()) &&
|
|
(redirection->argument_count() <= 8));
|
|
SimulatorLeafRuntimeCall target =
|
|
reinterpret_cast<SimulatorLeafRuntimeCall>(external);
|
|
const int64_t r0 = get_register(R0);
|
|
const int64_t r1 = get_register(R1);
|
|
const int64_t r2 = get_register(R2);
|
|
const int64_t r3 = get_register(R3);
|
|
const int64_t r4 = get_register(R4);
|
|
const int64_t r5 = get_register(R5);
|
|
const int64_t r6 = get_register(R6);
|
|
const int64_t r7 = get_register(R7);
|
|
const int64_t res = target(r0, r1, r2, r3, r4, r5, r6, r7);
|
|
set_register(instr, R0, res); // Set returned result from function.
|
|
set_register(instr, R1, icount_); // Zap unused result register.
|
|
} else if (redirection->call_kind() == kLeafFloatRuntimeCall) {
|
|
ASSERT((0 <= redirection->argument_count()) &&
|
|
(redirection->argument_count() <= 8));
|
|
SimulatorLeafFloatRuntimeCall target =
|
|
reinterpret_cast<SimulatorLeafFloatRuntimeCall>(external);
|
|
const double d0 = bit_cast<double, int64_t>(get_vregisterd(V0, 0));
|
|
const double d1 = bit_cast<double, int64_t>(get_vregisterd(V1, 0));
|
|
const double d2 = bit_cast<double, int64_t>(get_vregisterd(V2, 0));
|
|
const double d3 = bit_cast<double, int64_t>(get_vregisterd(V3, 0));
|
|
const double d4 = bit_cast<double, int64_t>(get_vregisterd(V4, 0));
|
|
const double d5 = bit_cast<double, int64_t>(get_vregisterd(V5, 0));
|
|
const double d6 = bit_cast<double, int64_t>(get_vregisterd(V6, 0));
|
|
const double d7 = bit_cast<double, int64_t>(get_vregisterd(V7, 0));
|
|
const double res = target(d0, d1, d2, d3, d4, d5, d6, d7);
|
|
set_vregisterd(V0, 0, bit_cast<int64_t, double>(res));
|
|
set_vregisterd(V0, 1, 0);
|
|
} else if (redirection->call_kind() == kBootstrapNativeCall) {
|
|
ASSERT(redirection->argument_count() == 1);
|
|
NativeArguments* arguments;
|
|
arguments = reinterpret_cast<NativeArguments*>(get_register(R0));
|
|
SimulatorBootstrapNativeCall target =
|
|
reinterpret_cast<SimulatorBootstrapNativeCall>(external);
|
|
target(arguments);
|
|
// Zap result register from void function.
|
|
set_register(instr, R0, icount_);
|
|
} else {
|
|
ASSERT(redirection->call_kind() == kNativeCall);
|
|
NativeArguments* arguments;
|
|
arguments = reinterpret_cast<NativeArguments*>(get_register(R0));
|
|
uword target_func = get_register(R1);
|
|
SimulatorNativeCall target =
|
|
reinterpret_cast<SimulatorNativeCall>(external);
|
|
target(arguments, target_func);
|
|
// Zap result register from void function.
|
|
set_register(instr, R0, icount_);
|
|
set_register(instr, R1, icount_);
|
|
}
|
|
|
|
// Zap caller-saved registers, since the actual runtime call could have
|
|
// used them.
|
|
set_register(NULL, R2, icount_);
|
|
set_register(NULL, R3, icount_);
|
|
set_register(NULL, R4, icount_);
|
|
set_register(NULL, R5, icount_);
|
|
set_register(NULL, R6, icount_);
|
|
set_register(NULL, R7, icount_);
|
|
set_register(NULL, R8, icount_);
|
|
set_register(NULL, R9, icount_);
|
|
set_register(NULL, R10, icount_);
|
|
set_register(NULL, R11, icount_);
|
|
set_register(NULL, R12, icount_);
|
|
set_register(NULL, R13, icount_);
|
|
set_register(NULL, R14, icount_);
|
|
set_register(NULL, R15, icount_);
|
|
set_register(NULL, IP0, icount_);
|
|
set_register(NULL, IP1, icount_);
|
|
set_register(NULL, R18, icount_);
|
|
set_register(NULL, LR, icount_);
|
|
|
|
// TODO(zra): Zap caller-saved fpu registers.
|
|
|
|
// Return.
|
|
set_pc(saved_lr);
|
|
} else {
|
|
// Coming via long jump from a throw. Continue to exception handler.
|
|
}
|
|
}
|
|
|
|
void Simulator::DecodeExceptionGen(Instr* instr) {
|
|
if ((instr->Bits(0, 2) == 1) && (instr->Bits(2, 3) == 0) &&
|
|
(instr->Bits(21, 3) == 0)) {
|
|
// Format(instr, "svc 'imm16");
|
|
UnimplementedInstruction(instr);
|
|
} else if ((instr->Bits(0, 2) == 0) && (instr->Bits(2, 3) == 0) &&
|
|
(instr->Bits(21, 3) == 1)) {
|
|
// Format(instr, "brk 'imm16");
|
|
SimulatorDebugger dbg(this);
|
|
int32_t imm = instr->Imm16Field();
|
|
char buffer[32];
|
|
snprintf(buffer, sizeof(buffer), "brk #0x%x", imm);
|
|
set_pc(get_pc() + Instr::kInstrSize);
|
|
dbg.Stop(instr, buffer);
|
|
} else if ((instr->Bits(0, 2) == 0) && (instr->Bits(2, 3) == 0) &&
|
|
(instr->Bits(21, 3) == 2)) {
|
|
// Format(instr, "hlt 'imm16");
|
|
uint16_t imm = static_cast<uint16_t>(instr->Imm16Field());
|
|
if (imm == Instr::kSimulatorBreakCode) {
|
|
SimulatorDebugger dbg(this);
|
|
dbg.Stop(instr, "breakpoint");
|
|
} else if (imm == Instr::kSimulatorRedirectCode) {
|
|
DoRedirectedCall(instr);
|
|
} else {
|
|
UnimplementedInstruction(instr);
|
|
}
|
|
} else {
|
|
UnimplementedInstruction(instr);
|
|
}
|
|
}
|
|
|
|
void Simulator::DecodeSystem(Instr* instr) {
|
|
if (instr->InstructionBits() == CLREX) {
|
|
// Format(instr, "clrex");
|
|
ClearExclusive();
|
|
return;
|
|
}
|
|
|
|
if ((instr->Bits(0, 8) == 0x1f) && (instr->Bits(12, 4) == 2) &&
|
|
(instr->Bits(16, 3) == 3) && (instr->Bits(19, 2) == 0) &&
|
|
(instr->Bit(21) == 0)) {
|
|
if (instr->Bits(8, 4) == 0) {
|
|
// Format(instr, "nop");
|
|
} else {
|
|
UnimplementedInstruction(instr);
|
|
}
|
|
} else {
|
|
UnimplementedInstruction(instr);
|
|
}
|
|
}
|
|
|
|
void Simulator::DecodeTestAndBranch(Instr* instr) {
|
|
const int op = instr->Bit(24);
|
|
const int bitpos = instr->Bits(19, 5) | (instr->Bit(31) << 5);
|
|
const int64_t imm14 = instr->SImm14Field();
|
|
const int64_t dest = get_pc() + (imm14 << 2);
|
|
const Register rt = instr->RtField();
|
|
const int64_t rt_val = get_register(rt, R31IsZR);
|
|
if (op == 0) {
|
|
// Format(instr, "tbz'sf 'rt, 'bitpos, 'dest14");
|
|
if ((rt_val & (1ll << bitpos)) == 0) {
|
|
set_pc(dest);
|
|
}
|
|
} else {
|
|
// Format(instr, "tbnz'sf 'rt, 'bitpos, 'dest14");
|
|
if ((rt_val & (1ll << bitpos)) != 0) {
|
|
set_pc(dest);
|
|
}
|
|
}
|
|
}
|
|
|
|
void Simulator::DecodeUnconditionalBranch(Instr* instr) {
|
|
const bool link = instr->Bit(31) == 1;
|
|
const int64_t imm26 = instr->SImm26Field();
|
|
const int64_t dest = get_pc() + (imm26 << 2);
|
|
const int64_t ret = get_pc() + Instr::kInstrSize;
|
|
set_pc(dest);
|
|
if (link) {
|
|
set_register(instr, LR, ret);
|
|
}
|
|
}
|
|
|
|
void Simulator::DecodeUnconditionalBranchReg(Instr* instr) {
|
|
if ((instr->Bits(0, 5) == 0) && (instr->Bits(10, 6) == 0) &&
|
|
(instr->Bits(16, 5) == 0x1f)) {
|
|
switch (instr->Bits(21, 4)) {
|
|
case 0: {
|
|
// Format(instr, "br 'rn");
|
|
const Register rn = instr->RnField();
|
|
const int64_t dest = get_register(rn, instr->RnMode());
|
|
set_pc(dest);
|
|
break;
|
|
}
|
|
case 1: {
|
|
// Format(instr, "blr 'rn");
|
|
const Register rn = instr->RnField();
|
|
const int64_t dest = get_register(rn, instr->RnMode());
|
|
const int64_t ret = get_pc() + Instr::kInstrSize;
|
|
set_pc(dest);
|
|
set_register(instr, LR, ret);
|
|
break;
|
|
}
|
|
case 2: {
|
|
// Format(instr, "ret 'rn");
|
|
const Register rn = instr->RnField();
|
|
const int64_t rn_val = get_register(rn, instr->RnMode());
|
|
set_pc(rn_val);
|
|
break;
|
|
}
|
|
default:
|
|
UnimplementedInstruction(instr);
|
|
break;
|
|
}
|
|
} else {
|
|
UnimplementedInstruction(instr);
|
|
}
|
|
}
|
|
|
|
void Simulator::DecodeCompareBranch(Instr* instr) {
|
|
if (instr->IsCompareAndBranchOp()) {
|
|
DecodeCompareAndBranch(instr);
|
|
} else if (instr->IsConditionalBranchOp()) {
|
|
DecodeConditionalBranch(instr);
|
|
} else if (instr->IsExceptionGenOp()) {
|
|
DecodeExceptionGen(instr);
|
|
} else if (instr->IsSystemOp()) {
|
|
DecodeSystem(instr);
|
|
} else if (instr->IsTestAndBranchOp()) {
|
|
DecodeTestAndBranch(instr);
|
|
} else if (instr->IsUnconditionalBranchOp()) {
|
|
DecodeUnconditionalBranch(instr);
|
|
} else if (instr->IsUnconditionalBranchRegOp()) {
|
|
DecodeUnconditionalBranchReg(instr);
|
|
} else {
|
|
UnimplementedInstruction(instr);
|
|
}
|
|
}
|
|
|
|
void Simulator::DecodeLoadStoreReg(Instr* instr) {
|
|
// Calculate the address.
|
|
const Register rn = instr->RnField();
|
|
const Register rt = instr->RtField();
|
|
const VRegister vt = instr->VtField();
|
|
const int64_t rn_val = get_register(rn, R31IsSP);
|
|
const uint32_t size = (instr->Bit(26) == 1)
|
|
? ((instr->Bit(23) << 2) | instr->SzField())
|
|
: instr->SzField();
|
|
uword address = 0;
|
|
uword wb_address = 0;
|
|
bool wb = false;
|
|
if (instr->Bit(24) == 1) {
|
|
// addr = rn + scaled unsigned 12-bit immediate offset.
|
|
const uint32_t imm12 = static_cast<uint32_t>(instr->Imm12Field());
|
|
const uint32_t offset = imm12 << size;
|
|
address = rn_val + offset;
|
|
} else if (instr->Bits(10, 2) == 0) {
|
|
// addr = rn + signed 9-bit immediate offset.
|
|
wb = false;
|
|
const int64_t offset = static_cast<int64_t>(instr->SImm9Field());
|
|
address = rn_val + offset;
|
|
wb_address = rn_val;
|
|
} else if (instr->Bit(10) == 1) {
|
|
// addr = rn + signed 9-bit immediate offset.
|
|
wb = true;
|
|
const int64_t offset = static_cast<int64_t>(instr->SImm9Field());
|
|
if (instr->Bit(11) == 1) {
|
|
// Pre-index.
|
|
address = rn_val + offset;
|
|
wb_address = address;
|
|
} else {
|
|
// Post-index.
|
|
address = rn_val;
|
|
wb_address = rn_val + offset;
|
|
}
|
|
} else if (instr->Bits(10, 2) == 2) {
|
|
// addr = rn + (rm EXT optionally scaled by operand instruction size).
|
|
const Register rm = instr->RmField();
|
|
const Extend ext = instr->ExtendTypeField();
|
|
const uint8_t scale = (ext == UXTX) && (instr->Bit(12) == 1) ? size : 0;
|
|
const int64_t rm_val = get_register(rm, R31IsZR);
|
|
const int64_t offset = ExtendOperand(kXRegSizeInBits, rm_val, ext, scale);
|
|
address = rn_val + offset;
|
|
} else {
|
|
UnimplementedInstruction(instr);
|
|
return;
|
|
}
|
|
|
|
// Check the address.
|
|
if (IsIllegalAddress(address)) {
|
|
HandleIllegalAccess(address, instr);
|
|
return;
|
|
}
|
|
|
|
// Do access.
|
|
if (instr->Bit(26) == 1) {
|
|
if (instr->Bit(22) == 0) {
|
|
// Format(instr, "fstr'fsz 'vt, 'memop");
|
|
const int64_t vt_val = get_vregisterd(vt, 0);
|
|
switch (size) {
|
|
case 2:
|
|
WriteW(address, vt_val & kWRegMask, instr);
|
|
break;
|
|
case 3:
|
|
WriteX(address, vt_val, instr);
|
|
break;
|
|
case 4: {
|
|
simd_value_t val;
|
|
get_vregister(vt, &val);
|
|
WriteX(address, val.bits.i64[0], instr);
|
|
WriteX(address + kWordSize, val.bits.i64[1], instr);
|
|
break;
|
|
}
|
|
default:
|
|
UnimplementedInstruction(instr);
|
|
return;
|
|
}
|
|
} else {
|
|
// Format(instr, "fldr'fsz 'vt, 'memop");
|
|
switch (size) {
|
|
case 2:
|
|
set_vregisterd(vt, 0, static_cast<int64_t>(ReadWU(address, instr)));
|
|
set_vregisterd(vt, 1, 0);
|
|
break;
|
|
case 3:
|
|
set_vregisterd(vt, 0, ReadX(address, instr));
|
|
set_vregisterd(vt, 1, 0);
|
|
break;
|
|
case 4: {
|
|
simd_value_t val;
|
|
val.bits.i64[0] = ReadX(address, instr);
|
|
val.bits.i64[1] = ReadX(address + kWordSize, instr);
|
|
set_vregister(vt, val);
|
|
break;
|
|
}
|
|
default:
|
|
UnimplementedInstruction(instr);
|
|
return;
|
|
}
|
|
}
|
|
} else {
|
|
if (instr->Bits(22, 2) == 0) {
|
|
// Format(instr, "str'sz 'rt, 'memop");
|
|
const int32_t rt_val32 = get_wregister(rt, R31IsZR);
|
|
switch (size) {
|
|
case 0: {
|
|
const uint8_t val = static_cast<uint8_t>(rt_val32);
|
|
WriteB(address, val);
|
|
break;
|
|
}
|
|
case 1: {
|
|
const uint16_t val = static_cast<uint16_t>(rt_val32);
|
|
WriteH(address, val, instr);
|
|
break;
|
|
}
|
|
case 2: {
|
|
const uint32_t val = static_cast<uint32_t>(rt_val32);
|
|
WriteW(address, val, instr);
|
|
break;
|
|
}
|
|
case 3: {
|
|
const int64_t val = get_register(rt, R31IsZR);
|
|
WriteX(address, val, instr);
|
|
break;
|
|
}
|
|
default:
|
|
UNREACHABLE();
|
|
break;
|
|
}
|
|
} else {
|
|
// Format(instr, "ldr'sz 'rt, 'memop");
|
|
// Undefined case.
|
|
if ((size == 3) && (instr->Bits(22, 2) == 3)) {
|
|
UnimplementedInstruction(instr);
|
|
return;
|
|
}
|
|
|
|
// Read the value.
|
|
const bool signd = instr->Bit(23) == 1;
|
|
// Write the W register for signed values when size < 2.
|
|
// Write the W register for unsigned values when size == 2.
|
|
const bool use_w =
|
|
(signd && (instr->Bit(22) == 1)) || (!signd && (size == 2));
|
|
int64_t val = 0; // Sign extend into an int64_t.
|
|
switch (size) {
|
|
case 0: {
|
|
if (signd) {
|
|
val = static_cast<int64_t>(ReadB(address));
|
|
} else {
|
|
val = static_cast<int64_t>(ReadBU(address));
|
|
}
|
|
break;
|
|
}
|
|
case 1: {
|
|
if (signd) {
|
|
val = static_cast<int64_t>(ReadH(address, instr));
|
|
} else {
|
|
val = static_cast<int64_t>(ReadHU(address, instr));
|
|
}
|
|
break;
|
|
}
|
|
case 2: {
|
|
if (signd) {
|
|
val = static_cast<int64_t>(ReadW(address, instr));
|
|
} else {
|
|
val = static_cast<int64_t>(ReadWU(address, instr));
|
|
}
|
|
break;
|
|
}
|
|
case 3:
|
|
val = ReadX(address, instr);
|
|
break;
|
|
default:
|
|
UNREACHABLE();
|
|
break;
|
|
}
|
|
|
|
// Write to register.
|
|
if (use_w) {
|
|
set_wregister(rt, static_cast<int32_t>(val), R31IsZR);
|
|
} else {
|
|
set_register(instr, rt, val, R31IsZR);
|
|
}
|
|
}
|
|
}
|
|
|
|
// Do writeback.
|
|
if (wb) {
|
|
set_register(instr, rn, wb_address, R31IsSP);
|
|
}
|
|
}
|
|
|
|
void Simulator::DecodeLoadStoreRegPair(Instr* instr) {
|
|
const int32_t opc = instr->Bits(23, 3);
|
|
const Register rn = instr->RnField();
|
|
const Register rt = instr->RtField();
|
|
const Register rt2 = instr->Rt2Field();
|
|
const int64_t rn_val = get_register(rn, R31IsSP);
|
|
const intptr_t shift = 2 + instr->SFField();
|
|
const intptr_t size = 1 << shift;
|
|
const int32_t offset = (instr->SImm7Field() << shift);
|
|
uword address = 0;
|
|
uword wb_address = 0;
|
|
bool wb = false;
|
|
|
|
if ((instr->Bits(30, 2) == 3) || (instr->Bit(26) != 0)) {
|
|
UnimplementedInstruction(instr);
|
|
return;
|
|
}
|
|
|
|
// Calculate address.
|
|
switch (opc) {
|
|
case 1:
|
|
address = rn_val;
|
|
wb_address = rn_val + offset;
|
|
wb = true;
|
|
break;
|
|
case 2:
|
|
address = rn_val + offset;
|
|
break;
|
|
case 3:
|
|
address = rn_val + offset;
|
|
wb_address = address;
|
|
wb = true;
|
|
break;
|
|
default:
|
|
UnimplementedInstruction(instr);
|
|
return;
|
|
}
|
|
|
|
// Check the address.
|
|
if (IsIllegalAddress(address)) {
|
|
HandleIllegalAccess(address, instr);
|
|
return;
|
|
}
|
|
|
|
// Do access.
|
|
if (instr->Bit(22)) {
|
|
// Format(instr, "ldp'sf 'rt, 'ra, 'memop");
|
|
const bool signd = instr->Bit(30) == 1;
|
|
int64_t val1 = 0; // Sign extend into an int64_t.
|
|
int64_t val2 = 0;
|
|
if (instr->Bit(31) == 1) {
|
|
// 64-bit read.
|
|
val1 = ReadX(address, instr);
|
|
val2 = ReadX(address + size, instr);
|
|
} else {
|
|
if (signd) {
|
|
val1 = static_cast<int64_t>(ReadW(address, instr));
|
|
val2 = static_cast<int64_t>(ReadW(address + size, instr));
|
|
} else {
|
|
val1 = static_cast<int64_t>(ReadWU(address, instr));
|
|
val2 = static_cast<int64_t>(ReadWU(address + size, instr));
|
|
}
|
|
}
|
|
|
|
// Write to register.
|
|
if (instr->Bit(31) == 1) {
|
|
set_register(instr, rt, val1, R31IsZR);
|
|
set_register(instr, rt2, val2, R31IsZR);
|
|
} else {
|
|
set_wregister(rt, static_cast<int32_t>(val1), R31IsZR);
|
|
set_wregister(rt2, static_cast<int32_t>(val2), R31IsZR);
|
|
}
|
|
} else {
|
|
// Format(instr, "stp'sf 'rt, 'ra, 'memop");
|
|
if (instr->Bit(31) == 1) {
|
|
const int64_t val1 = get_register(rt, R31IsZR);
|
|
const int64_t val2 = get_register(rt2, R31IsZR);
|
|
WriteX(address, val1, instr);
|
|
WriteX(address + size, val2, instr);
|
|
} else {
|
|
const int32_t val1 = get_wregister(rt, R31IsZR);
|
|
const int32_t val2 = get_wregister(rt2, R31IsZR);
|
|
WriteW(address, val1, instr);
|
|
WriteW(address + size, val2, instr);
|
|
}
|
|
}
|
|
|
|
// Do writeback.
|
|
if (wb) {
|
|
set_register(instr, rn, wb_address, R31IsSP);
|
|
}
|
|
}
|
|
|
|
void Simulator::DecodeLoadRegLiteral(Instr* instr) {
|
|
if ((instr->Bit(31) != 0) || (instr->Bit(29) != 0) ||
|
|
(instr->Bits(24, 3) != 0)) {
|
|
UnimplementedInstruction(instr);
|
|
}
|
|
|
|
const Register rt = instr->RtField();
|
|
const int64_t off = instr->SImm19Field() << 2;
|
|
const int64_t pc = reinterpret_cast<int64_t>(instr);
|
|
const int64_t address = pc + off;
|
|
const int64_t val = ReadX(address, instr);
|
|
if (instr->Bit(30)) {
|
|
// Format(instr, "ldrx 'rt, 'pcldr");
|
|
set_register(instr, rt, val, R31IsZR);
|
|
} else {
|
|
// Format(instr, "ldrw 'rt, 'pcldr");
|
|
set_wregister(rt, static_cast<int32_t>(val), R31IsZR);
|
|
}
|
|
}
|
|
|
|
void Simulator::DecodeLoadStoreExclusive(Instr* instr) {
|
|
if ((instr->Bit(23) != 0) || (instr->Bit(21) != 0) || (instr->Bit(15) != 0)) {
|
|
UNIMPLEMENTED();
|
|
}
|
|
const int32_t size = instr->Bits(30, 2);
|
|
if (size != 3 && size != 2) {
|
|
UNIMPLEMENTED();
|
|
}
|
|
const Register rs = instr->RsField();
|
|
const Register rn = instr->RnField();
|
|
const Register rt = instr->RtField();
|
|
ASSERT(instr->Rt2Field() == R31); // Should-Be-One
|
|
const bool is_load = instr->Bit(22) == 1;
|
|
if (is_load) {
|
|
ASSERT(rs == R31); // Should-Be-One
|
|
// Format(instr, "ldxr 'rt, 'rn");
|
|
if (size == 3) {
|
|
const int64_t addr = get_register(rn, R31IsSP);
|
|
intptr_t value = ReadExclusiveX(addr, instr);
|
|
set_register(instr, rt, value, R31IsSP);
|
|
} else {
|
|
const int64_t addr = get_register(rn, R31IsSP);
|
|
intptr_t value = ReadExclusiveW(addr, instr);
|
|
set_register(instr, rt, value, R31IsSP);
|
|
}
|
|
} else {
|
|
// Format(instr, "stxr 'rs, 'rt, 'rn");
|
|
if (size == 3) {
|
|
uword value = get_register(rt, R31IsSP);
|
|
uword addr = get_register(rn, R31IsSP);
|
|
intptr_t status = WriteExclusiveX(addr, value, instr);
|
|
set_register(instr, rs, status, R31IsSP);
|
|
} else {
|
|
uint32_t value = get_register(rt, R31IsSP);
|
|
uword addr = get_register(rn, R31IsSP);
|
|
intptr_t status = WriteExclusiveW(addr, value, instr);
|
|
set_register(instr, rs, status, R31IsSP);
|
|
}
|
|
}
|
|
}
|
|
|
|
void Simulator::DecodeLoadStore(Instr* instr) {
|
|
if (instr->IsLoadStoreRegOp()) {
|
|
DecodeLoadStoreReg(instr);
|
|
} else if (instr->IsLoadStoreRegPairOp()) {
|
|
DecodeLoadStoreRegPair(instr);
|
|
} else if (instr->IsLoadRegLiteralOp()) {
|
|
DecodeLoadRegLiteral(instr);
|
|
} else if (instr->IsLoadStoreExclusiveOp()) {
|
|
DecodeLoadStoreExclusive(instr);
|
|
} else {
|
|
UnimplementedInstruction(instr);
|
|
}
|
|
}
|
|
|
|
int64_t Simulator::ShiftOperand(uint8_t reg_size,
|
|
int64_t value,
|
|
Shift shift_type,
|
|
uint8_t amount) {
|
|
if (amount == 0) {
|
|
return value;
|
|
}
|
|
int64_t mask = reg_size == kXRegSizeInBits ? kXRegMask : kWRegMask;
|
|
switch (shift_type) {
|
|
case LSL:
|
|
return (value << amount) & mask;
|
|
case LSR:
|
|
return static_cast<uint64_t>(value) >> amount;
|
|
case ASR: {
|
|
// Shift used to restore the sign.
|
|
uint8_t s_shift = kXRegSizeInBits - reg_size;
|
|
// Value with its sign restored.
|
|
int64_t s_value = (value << s_shift) >> s_shift;
|
|
return (s_value >> amount) & mask;
|
|
}
|
|
case ROR: {
|
|
if (reg_size == kWRegSizeInBits) {
|
|
value &= kWRegMask;
|
|
}
|
|
return (static_cast<uint64_t>(value) >> amount) |
|
|
((static_cast<uint64_t>(value) & ((1ULL << amount) - 1ULL))
|
|
<< (reg_size - amount));
|
|
}
|
|
default:
|
|
UNIMPLEMENTED();
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
int64_t Simulator::ExtendOperand(uint8_t reg_size,
|
|
int64_t value,
|
|
Extend extend_type,
|
|
uint8_t amount) {
|
|
switch (extend_type) {
|
|
case UXTB:
|
|
value &= 0xff;
|
|
break;
|
|
case UXTH:
|
|
value &= 0xffff;
|
|
break;
|
|
case UXTW:
|
|
value &= 0xffffffff;
|
|
break;
|
|
case SXTB:
|
|
value = (value << 56) >> 56;
|
|
break;
|
|
case SXTH:
|
|
value = (value << 48) >> 48;
|
|
break;
|
|
case SXTW:
|
|
value = (value << 32) >> 32;
|
|
break;
|
|
case UXTX:
|
|
case SXTX:
|
|
break;
|
|
default:
|
|
UNREACHABLE();
|
|
break;
|
|
}
|
|
int64_t mask = (reg_size == kXRegSizeInBits) ? kXRegMask : kWRegMask;
|
|
return (value << amount) & mask;
|
|
}
|
|
|
|
int64_t Simulator::DecodeShiftExtendOperand(Instr* instr) {
|
|
const Register rm = instr->RmField();
|
|
const int64_t rm_val = get_register(rm, R31IsZR);
|
|
const uint8_t size = instr->SFField() ? kXRegSizeInBits : kWRegSizeInBits;
|
|
if (instr->IsShift()) {
|
|
const Shift shift_type = instr->ShiftTypeField();
|
|
const uint8_t shift_amount = instr->Imm6Field();
|
|
return ShiftOperand(size, rm_val, shift_type, shift_amount);
|
|
} else {
|
|
ASSERT(instr->IsExtend());
|
|
const Extend extend_type = instr->ExtendTypeField();
|
|
const uint8_t shift_amount = instr->Imm3Field();
|
|
return ExtendOperand(size, rm_val, extend_type, shift_amount);
|
|
}
|
|
UNREACHABLE();
|
|
return -1;
|
|
}
|
|
|
|
void Simulator::DecodeAddSubShiftExt(Instr* instr) {
|
|
// Format(instr, "add'sf's 'rd, 'rn, 'shift_op");
|
|
// also, sub, cmp, etc.
|
|
const bool addition = (instr->Bit(30) == 0);
|
|
const Register rd = instr->RdField();
|
|
const Register rn = instr->RnField();
|
|
const int64_t rm_val = DecodeShiftExtendOperand(instr);
|
|
if (instr->SFField()) {
|
|
// 64-bit add.
|
|
const int64_t rn_val = get_register(rn, instr->RnMode());
|
|
const int64_t alu_out = rn_val + (addition ? rm_val : -rm_val);
|
|
set_register(instr, rd, alu_out, instr->RdMode());
|
|
if (instr->HasS()) {
|
|
SetNZFlagsX(alu_out);
|
|
SetCFlag(CarryFromX(alu_out, rn_val, rm_val, addition));
|
|
SetVFlag(OverflowFromX(alu_out, rn_val, rm_val, addition));
|
|
}
|
|
} else {
|
|
// 32-bit add.
|
|
const int32_t rn_val = get_wregister(rn, instr->RnMode());
|
|
int32_t rm_val32 = static_cast<int32_t>(rm_val & kWRegMask);
|
|
int32_t carry_in = 0;
|
|
if (!addition) {
|
|
carry_in = 1;
|
|
rm_val32 = ~rm_val32;
|
|
}
|
|
const int32_t alu_out = rn_val + rm_val32 + carry_in;
|
|
set_wregister(rd, alu_out, instr->RdMode());
|
|
if (instr->HasS()) {
|
|
SetNZFlagsW(alu_out);
|
|
SetCFlag(CarryFromW(rn_val, rm_val32, carry_in));
|
|
SetVFlag(OverflowFromW(rn_val, rm_val32, carry_in));
|
|
}
|
|
}
|
|
}
|
|
|
|
void Simulator::DecodeAddSubWithCarry(Instr* instr) {
|
|
// Format(instr, "adc'sf's 'rd, 'rn, 'rm");
|
|
// Format(instr, "sbc'sf's 'rd, 'rn, 'rm");
|
|
const bool addition = (instr->Bit(30) == 0);
|
|
const Register rd = instr->RdField();
|
|
const Register rn = instr->RnField();
|
|
const Register rm = instr->RmField();
|
|
const int64_t rn_val64 = get_register(rn, R31IsZR);
|
|
const int32_t rn_val32 = get_wregister(rn, R31IsZR);
|
|
const int64_t rm_val64 = get_register(rm, R31IsZR);
|
|
int32_t rm_val32 = get_wregister(rm, R31IsZR);
|
|
const int32_t carry_in = c_flag_ ? 1 : 0;
|
|
if (instr->SFField()) {
|
|
// 64-bit add.
|
|
const int64_t alu_out =
|
|
rn_val64 + (addition ? rm_val64 : ~rm_val64) + carry_in;
|
|
set_register(instr, rd, alu_out, R31IsZR);
|
|
if (instr->HasS()) {
|
|
SetNZFlagsX(alu_out);
|
|
SetCFlag(CarryFromX(alu_out, rn_val64, rm_val64, addition));
|
|
SetVFlag(OverflowFromX(alu_out, rn_val64, rm_val64, addition));
|
|
}
|
|
} else {
|
|
// 32-bit add.
|
|
if (!addition) {
|
|
rm_val32 = ~rm_val32;
|
|
}
|
|
const int32_t alu_out = rn_val32 + rm_val32 + carry_in;
|
|
set_wregister(rd, alu_out, R31IsZR);
|
|
if (instr->HasS()) {
|
|
SetNZFlagsW(alu_out);
|
|
SetCFlag(CarryFromW(rn_val32, rm_val32, carry_in));
|
|
SetVFlag(OverflowFromW(rn_val32, rm_val32, carry_in));
|
|
}
|
|
}
|
|
}
|
|
|
|
void Simulator::DecodeLogicalShift(Instr* instr) {
|
|
const int op = (instr->Bits(29, 2) << 1) | instr->Bit(21);
|
|
const Register rd = instr->RdField();
|
|
const Register rn = instr->RnField();
|
|
const int64_t rn_val = get_register(rn, instr->RnMode());
|
|
const int64_t rm_val = DecodeShiftExtendOperand(instr);
|
|
int64_t alu_out = 0;
|
|
switch (op) {
|
|
case 0:
|
|
// Format(instr, "and'sf 'rd, 'rn, 'shift_op");
|
|
alu_out = rn_val & rm_val;
|
|
break;
|
|
case 1:
|
|
// Format(instr, "bic'sf 'rd, 'rn, 'shift_op");
|
|
alu_out = rn_val & (~rm_val);
|
|
break;
|
|
case 2:
|
|
// Format(instr, "orr'sf 'rd, 'rn, 'shift_op");
|
|
alu_out = rn_val | rm_val;
|
|
break;
|
|
case 3:
|
|
// Format(instr, "orn'sf 'rd, 'rn, 'shift_op");
|
|
alu_out = rn_val | (~rm_val);
|
|
break;
|
|
case 4:
|
|
// Format(instr, "eor'sf 'rd, 'rn, 'shift_op");
|
|
alu_out = rn_val ^ rm_val;
|
|
break;
|
|
case 5:
|
|
// Format(instr, "eon'sf 'rd, 'rn, 'shift_op");
|
|
alu_out = rn_val ^ (~rm_val);
|
|
break;
|
|
case 6:
|
|
// Format(instr, "and'sfs 'rd, 'rn, 'shift_op");
|
|
alu_out = rn_val & rm_val;
|
|
break;
|
|
case 7:
|
|
// Format(instr, "bic'sfs 'rd, 'rn, 'shift_op");
|
|
alu_out = rn_val & (~rm_val);
|
|
break;
|
|
default:
|
|
UNREACHABLE();
|
|
break;
|
|
}
|
|
|
|
// Set flags if ands or bics.
|
|
if ((op == 6) || (op == 7)) {
|
|
if (instr->SFField() == 1) {
|
|
SetNZFlagsX(alu_out);
|
|
} else {
|
|
SetNZFlagsW(alu_out);
|
|
}
|
|
SetCFlag(false);
|
|
SetVFlag(false);
|
|
}
|
|
|
|
if (instr->SFField() == 1) {
|
|
set_register(instr, rd, alu_out, instr->RdMode());
|
|
} else {
|
|
set_wregister(rd, alu_out & kWRegMask, instr->RdMode());
|
|
}
|
|
}
|
|
|
|
static int64_t divide64(int64_t top, int64_t bottom, bool signd) {
|
|
// ARM64 does not trap on integer division by zero. The destination register
|
|
// is instead set to 0.
|
|
if (bottom == 0) {
|
|
return 0;
|
|
}
|
|
|
|
if (signd) {
|
|
// INT_MIN / -1 = INT_MIN.
|
|
if ((top == static_cast<int64_t>(0x8000000000000000LL)) &&
|
|
(bottom == static_cast<int64_t>(0xffffffffffffffffLL))) {
|
|
return static_cast<int64_t>(0x8000000000000000LL);
|
|
} else {
|
|
return top / bottom;
|
|
}
|
|
} else {
|
|
const uint64_t utop = static_cast<uint64_t>(top);
|
|
const uint64_t ubottom = static_cast<uint64_t>(bottom);
|
|
return static_cast<int64_t>(utop / ubottom);
|
|
}
|
|
}
|
|
|
|
static int32_t divide32(int32_t top, int32_t bottom, bool signd) {
|
|
// ARM64 does not trap on integer division by zero. The destination register
|
|
// is instead set to 0.
|
|
if (bottom == 0) {
|
|
return 0;
|
|
}
|
|
|
|
if (signd) {
|
|
// INT_MIN / -1 = INT_MIN.
|
|
if ((top == static_cast<int32_t>(0x80000000)) &&
|
|
(bottom == static_cast<int32_t>(0xffffffff))) {
|
|
return static_cast<int32_t>(0x80000000);
|
|
} else {
|
|
return top / bottom;
|
|
}
|
|
} else {
|
|
const uint32_t utop = static_cast<uint32_t>(top);
|
|
const uint32_t ubottom = static_cast<uint32_t>(bottom);
|
|
return static_cast<int32_t>(utop / ubottom);
|
|
}
|
|
}
|
|
|
|
void Simulator::DecodeMiscDP1Source(Instr* instr) {
|
|
if (instr->Bit(29) != 0) {
|
|
UnimplementedInstruction(instr);
|
|
}
|
|
|
|
const Register rd = instr->RdField();
|
|
const Register rn = instr->RnField();
|
|
const int op = instr->Bits(10, 10);
|
|
const int64_t rn_val64 = get_register(rn, R31IsZR);
|
|
const int32_t rn_val32 = get_wregister(rn, R31IsZR);
|
|
switch (op) {
|
|
case 4: {
|
|
// Format(instr, "clz'sf 'rd, 'rn");
|
|
int64_t rd_val = 0;
|
|
int64_t rn_val = (instr->SFField() == 1) ? rn_val64 : rn_val32;
|
|
if (rn_val != 0) {
|
|
while (rn_val > 0) {
|
|
rd_val++;
|
|
rn_val <<= 1;
|
|
}
|
|
} else {
|
|
rd_val = (instr->SFField() == 1) ? 64 : 32;
|
|
}
|
|
if (instr->SFField() == 1) {
|
|
set_register(instr, rd, rd_val, R31IsZR);
|
|
} else {
|
|
set_wregister(rd, rd_val, R31IsZR);
|
|
}
|
|
break;
|
|
}
|
|
default:
|
|
UnimplementedInstruction(instr);
|
|
break;
|
|
}
|
|
}
|
|
|
|
void Simulator::DecodeMiscDP2Source(Instr* instr) {
|
|
if (instr->Bit(29) != 0) {
|
|
UnimplementedInstruction(instr);
|
|
}
|
|
|
|
const Register rd = instr->RdField();
|
|
const Register rn = instr->RnField();
|
|
const Register rm = instr->RmField();
|
|
const int op = instr->Bits(10, 5);
|
|
const int64_t rn_val64 = get_register(rn, R31IsZR);
|
|
const int64_t rm_val64 = get_register(rm, R31IsZR);
|
|
const int32_t rn_val32 = get_wregister(rn, R31IsZR);
|
|
const int32_t rm_val32 = get_wregister(rm, R31IsZR);
|
|
switch (op) {
|
|
case 2:
|
|
case 3: {
|
|
// Format(instr, "udiv'sf 'rd, 'rn, 'rm");
|
|
// Format(instr, "sdiv'sf 'rd, 'rn, 'rm");
|
|
const bool signd = instr->Bit(10) == 1;
|
|
if (instr->SFField() == 1) {
|
|
set_register(instr, rd, divide64(rn_val64, rm_val64, signd), R31IsZR);
|
|
} else {
|
|
set_wregister(rd, divide32(rn_val32, rm_val32, signd), R31IsZR);
|
|
}
|
|
break;
|
|
}
|
|
case 8: {
|
|
// Format(instr, "lsl'sf 'rd, 'rn, 'rm");
|
|
if (instr->SFField() == 1) {
|
|
const int64_t alu_out = rn_val64 << (rm_val64 & (kXRegSizeInBits - 1));
|
|
set_register(instr, rd, alu_out, R31IsZR);
|
|
} else {
|
|
const int32_t alu_out = rn_val32 << (rm_val32 & (kXRegSizeInBits - 1));
|
|
set_wregister(rd, alu_out, R31IsZR);
|
|
}
|
|
break;
|
|
}
|
|
case 9: {
|
|
// Format(instr, "lsr'sf 'rd, 'rn, 'rm");
|
|
if (instr->SFField() == 1) {
|
|
const uint64_t rn_u64 = static_cast<uint64_t>(rn_val64);
|
|
const int64_t alu_out = rn_u64 >> (rm_val64 & (kXRegSizeInBits - 1));
|
|
set_register(instr, rd, alu_out, R31IsZR);
|
|
} else {
|
|
const uint32_t rn_u32 = static_cast<uint32_t>(rn_val32);
|
|
const int32_t alu_out = rn_u32 >> (rm_val32 & (kXRegSizeInBits - 1));
|
|
set_wregister(rd, alu_out, R31IsZR);
|
|
}
|
|
break;
|
|
}
|
|
case 10: {
|
|
// Format(instr, "asr'sf 'rd, 'rn, 'rm");
|
|
if (instr->SFField() == 1) {
|
|
const int64_t alu_out = rn_val64 >> (rm_val64 & (kXRegSizeInBits - 1));
|
|
set_register(instr, rd, alu_out, R31IsZR);
|
|
} else {
|
|
const int32_t alu_out = rn_val32 >> (rm_val32 & (kXRegSizeInBits - 1));
|
|
set_wregister(rd, alu_out, R31IsZR);
|
|
}
|
|
break;
|
|
}
|
|
default:
|
|
UnimplementedInstruction(instr);
|
|
break;
|
|
}
|
|
}
|
|
|
|
void Simulator::DecodeMiscDP3Source(Instr* instr) {
|
|
const Register rd = instr->RdField();
|
|
const Register rn = instr->RnField();
|
|
const Register rm = instr->RmField();
|
|
const Register ra = instr->RaField();
|
|
if ((instr->Bits(29, 2) == 0) && (instr->Bits(21, 3) == 0) &&
|
|
(instr->Bit(15) == 0)) {
|
|
// Format(instr, "madd'sf 'rd, 'rn, 'rm, 'ra");
|
|
if (instr->SFField() == 1) {
|
|
const int64_t rn_val = get_register(rn, R31IsZR);
|
|
const int64_t rm_val = get_register(rm, R31IsZR);
|
|
const int64_t ra_val = get_register(ra, R31IsZR);
|
|
const int64_t alu_out = ra_val + (rn_val * rm_val);
|
|
set_register(instr, rd, alu_out, R31IsZR);
|
|
} else {
|
|
const int32_t rn_val = get_wregister(rn, R31IsZR);
|
|
const int32_t rm_val = get_wregister(rm, R31IsZR);
|
|
const int32_t ra_val = get_wregister(ra, R31IsZR);
|
|
const int32_t alu_out = ra_val + (rn_val * rm_val);
|
|
set_wregister(rd, alu_out, R31IsZR);
|
|
}
|
|
} else if ((instr->Bits(29, 2) == 0) && (instr->Bits(21, 3) == 0) &&
|
|
(instr->Bit(15) == 1)) {
|
|
// Format(instr, "msub'sf 'rd, 'rn, 'rm, 'ra");
|
|
if (instr->SFField() == 1) {
|
|
const int64_t rn_val = get_register(rn, R31IsZR);
|
|
const int64_t rm_val = get_register(rm, R31IsZR);
|
|
const int64_t ra_val = get_register(ra, R31IsZR);
|
|
const int64_t alu_out = ra_val - (rn_val * rm_val);
|
|
set_register(instr, rd, alu_out, R31IsZR);
|
|
} else {
|
|
const int32_t rn_val = get_wregister(rn, R31IsZR);
|
|
const int32_t rm_val = get_wregister(rm, R31IsZR);
|
|
const int32_t ra_val = get_wregister(ra, R31IsZR);
|
|
const int32_t alu_out = ra_val - (rn_val * rm_val);
|
|
set_wregister(rd, alu_out, R31IsZR);
|
|
}
|
|
} else if ((instr->Bits(29, 3) == 4) && (instr->Bits(21, 3) == 2) &&
|
|
(instr->Bit(15) == 0)) {
|
|
ASSERT(ra == R31); // Should-Be-One
|
|
// Format(instr, "smulh 'rd, 'rn, 'rm");
|
|
const int64_t rn_val = get_register(rn, R31IsZR);
|
|
const int64_t rm_val = get_register(rm, R31IsZR);
|
|
#if defined(HOST_OS_WINDOWS)
|
|
// Visual Studio does not support __int128.
|
|
int64_t alu_out;
|
|
Multiply128(rn_val, rm_val, &alu_out);
|
|
#else
|
|
const __int128 res =
|
|
static_cast<__int128>(rn_val) * static_cast<__int128>(rm_val);
|
|
const int64_t alu_out = static_cast<int64_t>(res >> 64);
|
|
#endif // HOST_OS_WINDOWS
|
|
set_register(instr, rd, alu_out, R31IsZR);
|
|
} else if ((instr->Bits(29, 3) == 4) && (instr->Bits(21, 3) == 6) &&
|
|
(instr->Bit(15) == 0)) {
|
|
ASSERT(ra == R31); // Should-Be-One
|
|
// Format(instr, "umulh 'rd, 'rn, 'rm");
|
|
const uint64_t rn_val = get_register(rn, R31IsZR);
|
|
const uint64_t rm_val = get_register(rm, R31IsZR);
|
|
#if defined(HOST_OS_WINDOWS)
|
|
// Visual Studio does not support __int128.
|
|
uint64_t alu_out;
|
|
UnsignedMultiply128(rn_val, rm_val, &alu_out);
|
|
#else
|
|
const unsigned __int128 res = static_cast<unsigned __int128>(rn_val) *
|
|
static_cast<unsigned __int128>(rm_val);
|
|
const uint64_t alu_out = static_cast<uint64_t>(res >> 64);
|
|
#endif // HOST_OS_WINDOWS
|
|
set_register(instr, rd, alu_out, R31IsZR);
|
|
} else if ((instr->Bits(29, 3) == 4) && (instr->Bit(15) == 0)) {
|
|
if (instr->Bits(21, 3) == 5) {
|
|
// Format(instr, "umaddl 'rd, 'rn, 'rm, 'ra");
|
|
const uint64_t rn_val = static_cast<uint32_t>(get_wregister(rn, R31IsZR));
|
|
const uint64_t rm_val = static_cast<uint32_t>(get_wregister(rm, R31IsZR));
|
|
const uint64_t ra_val = get_register(ra, R31IsZR);
|
|
const uint64_t alu_out = ra_val + (rn_val * rm_val);
|
|
set_register(instr, rd, alu_out, R31IsZR);
|
|
} else {
|
|
// Format(instr, "smaddl 'rd, 'rn, 'rm, 'ra");
|
|
const int64_t rn_val = static_cast<int32_t>(get_wregister(rn, R31IsZR));
|
|
const int64_t rm_val = static_cast<int32_t>(get_wregister(rm, R31IsZR));
|
|
const int64_t ra_val = get_register(ra, R31IsZR);
|
|
const int64_t alu_out = ra_val + (rn_val * rm_val);
|
|
set_register(instr, rd, alu_out, R31IsZR);
|
|
}
|
|
} else {
|
|
UnimplementedInstruction(instr);
|
|
}
|
|
}
|
|
|
|
void Simulator::DecodeConditionalSelect(Instr* instr) {
|
|
const Register rd = instr->RdField();
|
|
const Register rn = instr->RnField();
|
|
const Register rm = instr->RmField();
|
|
const int64_t rm_val64 = get_register(rm, R31IsZR);
|
|
const int32_t rm_val32 = get_wregister(rm, R31IsZR);
|
|
const int64_t rn_val64 = get_register(rn, instr->RnMode());
|
|
const int32_t rn_val32 = get_wregister(rn, instr->RnMode());
|
|
int64_t result64 = 0;
|
|
int32_t result32 = 0;
|
|
|
|
if ((instr->Bits(29, 2) == 0) && (instr->Bits(10, 2) == 0)) {
|
|
// Format(instr, "mov'sf'cond 'rd, 'rn, 'rm");
|
|
result64 = rm_val64;
|
|
result32 = rm_val32;
|
|
if (ConditionallyExecute(instr)) {
|
|
result64 = rn_val64;
|
|
result32 = rn_val32;
|
|
}
|
|
} else if ((instr->Bits(29, 2) == 0) && (instr->Bits(10, 2) == 1)) {
|
|
// Format(instr, "csinc'sf'cond 'rd, 'rn, 'rm");
|
|
result64 = rm_val64 + 1;
|
|
result32 = rm_val32 + 1;
|
|
if (ConditionallyExecute(instr)) {
|
|
result64 = rn_val64;
|
|
result32 = rn_val32;
|
|
}
|
|
} else if ((instr->Bits(29, 2) == 2) && (instr->Bits(10, 2) == 0)) {
|
|
// Format(instr, "csinv'sf'cond 'rd, 'rn, 'rm");
|
|
result64 = ~rm_val64;
|
|
result32 = ~rm_val32;
|
|
if (ConditionallyExecute(instr)) {
|
|
result64 = rn_val64;
|
|
result32 = rn_val32;
|
|
}
|
|
} else if ((instr->Bits(29, 2) == 2) && (instr->Bits(10, 2) == 1)) {
|
|
// Format(instr, "csneg'sf'cond 'rd, 'rn, 'rm");
|
|
result64 = -rm_val64;
|
|
result32 = -rm_val32;
|
|
if (ConditionallyExecute(instr)) {
|
|
result64 = rn_val64;
|
|
result32 = rn_val32;
|
|
}
|
|
} else {
|
|
UnimplementedInstruction(instr);
|
|
return;
|
|
}
|
|
|
|
if (instr->SFField() == 1) {
|
|
set_register(instr, rd, result64, instr->RdMode());
|
|
} else {
|
|
set_wregister(rd, result32, instr->RdMode());
|
|
}
|
|
}
|
|
|
|
void Simulator::DecodeDPRegister(Instr* instr) {
|
|
if (instr->IsAddSubShiftExtOp()) {
|
|
DecodeAddSubShiftExt(instr);
|
|
} else if (instr->IsAddSubWithCarryOp()) {
|
|
DecodeAddSubWithCarry(instr);
|
|
} else if (instr->IsLogicalShiftOp()) {
|
|
DecodeLogicalShift(instr);
|
|
} else if (instr->IsMiscDP1SourceOp()) {
|
|
DecodeMiscDP1Source(instr);
|
|
} else if (instr->IsMiscDP2SourceOp()) {
|
|
DecodeMiscDP2Source(instr);
|
|
} else if (instr->IsMiscDP3SourceOp()) {
|
|
DecodeMiscDP3Source(instr);
|
|
} else if (instr->IsConditionalSelectOp()) {
|
|
DecodeConditionalSelect(instr);
|
|
} else {
|
|
UnimplementedInstruction(instr);
|
|
}
|
|
}
|
|
|
|
void Simulator::DecodeSIMDCopy(Instr* instr) {
|
|
const int32_t Q = instr->Bit(30);
|
|
const int32_t op = instr->Bit(29);
|
|
const int32_t imm4 = instr->Bits(11, 4);
|
|
const int32_t imm5 = instr->Bits(16, 5);
|
|
|
|
int32_t idx4 = -1;
|
|
int32_t idx5 = -1;
|
|
int32_t element_bytes;
|
|
if (imm5 & 0x1) {
|
|
idx4 = imm4;
|
|
idx5 = imm5 >> 1;
|
|
element_bytes = 1;
|
|
} else if (imm5 & 0x2) {
|
|
idx4 = imm4 >> 1;
|
|
idx5 = imm5 >> 2;
|
|
element_bytes = 2;
|
|
} else if (imm5 & 0x4) {
|
|
idx4 = imm4 >> 2;
|
|
idx5 = imm5 >> 3;
|
|
element_bytes = 4;
|
|
} else if (imm5 & 0x8) {
|
|
idx4 = imm4 >> 3;
|
|
idx5 = imm5 >> 4;
|
|
element_bytes = 8;
|
|
} else {
|
|
UnimplementedInstruction(instr);
|
|
return;
|
|
}
|
|
ASSERT((idx4 != -1) && (idx5 != -1));
|
|
|
|
const VRegister vd = instr->VdField();
|
|
const VRegister vn = instr->VnField();
|
|
const Register rn = instr->RnField();
|
|
const Register rd = instr->RdField();
|
|
if ((op == 0) && (imm4 == 7)) {
|
|
if (Q == 0) {
|
|
// Format(instr, "vmovrs 'rd, 'vn'idx5");
|
|
set_wregister(rd, get_vregisters(vn, idx5), R31IsZR);
|
|
} else {
|
|
// Format(instr, "vmovrd 'rd, 'vn'idx5");
|
|
set_register(instr, rd, get_vregisterd(vn, idx5), R31IsZR);
|
|
}
|
|
} else if ((Q == 1) && (op == 0) && (imm4 == 0)) {
|
|
// Format(instr, "vdup'csz 'vd, 'vn'idx5");
|
|
if (element_bytes == 4) {
|
|
for (int i = 0; i < 4; i++) {
|
|
set_vregisters(vd, i, get_vregisters(vn, idx5));
|
|
}
|
|
} else if (element_bytes == 8) {
|
|
for (int i = 0; i < 2; i++) {
|
|
set_vregisterd(vd, i, get_vregisterd(vn, idx5));
|
|
}
|
|
} else {
|
|
UnimplementedInstruction(instr);
|
|
return;
|
|
}
|
|
} else if ((Q == 1) && (op == 0) && (imm4 == 3)) {
|
|
// Format(instr, "vins'csz 'vd'idx5, 'rn");
|
|
if (element_bytes == 4) {
|
|
set_vregisters(vd, idx5, get_wregister(rn, R31IsZR));
|
|
} else if (element_bytes == 8) {
|
|
set_vregisterd(vd, idx5, get_register(rn, R31IsZR));
|
|
} else {
|
|
UnimplementedInstruction(instr);
|
|
}
|
|
} else if ((Q == 1) && (op == 0) && (imm4 == 1)) {
|
|
// Format(instr, "vdup'csz 'vd, 'rn");
|
|
if (element_bytes == 4) {
|
|
for (int i = 0; i < 4; i++) {
|
|
set_vregisters(vd, i, get_wregister(rn, R31IsZR));
|
|
}
|
|
} else if (element_bytes == 8) {
|
|
for (int i = 0; i < 2; i++) {
|
|
set_vregisterd(vd, i, get_register(rn, R31IsZR));
|
|
}
|
|
} else {
|
|
UnimplementedInstruction(instr);
|
|
return;
|
|
}
|
|
} else if ((Q == 1) && (op == 1)) {
|
|
// Format(instr, "vins'csz 'vd'idx5, 'vn'idx4");
|
|
if (element_bytes == 4) {
|
|
set_vregisters(vd, idx5, get_vregisters(vn, idx4));
|
|
} else if (element_bytes == 8) {
|
|
set_vregisterd(vd, idx5, get_vregisterd(vn, idx4));
|
|
} else {
|
|
UnimplementedInstruction(instr);
|
|
}
|
|
} else {
|
|
UnimplementedInstruction(instr);
|
|
}
|
|
}
|
|
|
|
void Simulator::DecodeSIMDThreeSame(Instr* instr) {
|
|
const int Q = instr->Bit(30);
|
|
const int U = instr->Bit(29);
|
|
const int opcode = instr->Bits(11, 5);
|
|
|
|
if (Q == 0) {
|
|
UnimplementedInstruction(instr);
|
|
return;
|
|
}
|
|
|
|
const VRegister vd = instr->VdField();
|
|
const VRegister vn = instr->VnField();
|
|
const VRegister vm = instr->VmField();
|
|
if (instr->Bit(22) == 0) {
|
|
// f32 case.
|
|
for (int idx = 0; idx < 4; idx++) {
|
|
const int32_t vn_val = get_vregisters(vn, idx);
|
|
const int32_t vm_val = get_vregisters(vm, idx);
|
|
const float vn_flt = bit_cast<float, int32_t>(vn_val);
|
|
const float vm_flt = bit_cast<float, int32_t>(vm_val);
|
|
int32_t res = 0.0;
|
|
if ((U == 0) && (opcode == 0x3)) {
|
|
if (instr->Bit(23) == 0) {
|
|
// Format(instr, "vand 'vd, 'vn, 'vm");
|
|
res = vn_val & vm_val;
|
|
} else {
|
|
// Format(instr, "vorr 'vd, 'vn, 'vm");
|
|
res = vn_val | vm_val;
|
|
}
|
|
} else if ((U == 1) && (opcode == 0x3)) {
|
|
// Format(instr, "veor 'vd, 'vn, 'vm");
|
|
res = vn_val ^ vm_val;
|
|
} else if ((U == 0) && (opcode == 0x10)) {
|
|
// Format(instr, "vadd'vsz 'vd, 'vn, 'vm");
|
|
res = vn_val + vm_val;
|
|
} else if ((U == 1) && (opcode == 0x10)) {
|
|
// Format(instr, "vsub'vsz 'vd, 'vn, 'vm");
|
|
res = vn_val - vm_val;
|
|
} else if ((U == 0) && (opcode == 0x1a)) {
|
|
if (instr->Bit(23) == 0) {
|
|
// Format(instr, "vadd'vsz 'vd, 'vn, 'vm");
|
|
res = bit_cast<int32_t, float>(vn_flt + vm_flt);
|
|
} else {
|
|
// Format(instr, "vsub'vsz 'vd, 'vn, 'vm");
|
|
res = bit_cast<int32_t, float>(vn_flt - vm_flt);
|
|
}
|
|
} else if ((U == 1) && (opcode == 0x1b)) {
|
|
// Format(instr, "vmul'vsz 'vd, 'vn, 'vm");
|
|
res = bit_cast<int32_t, float>(vn_flt * vm_flt);
|
|
} else if ((U == 1) && (opcode == 0x1f)) {
|
|
// Format(instr, "vdiv'vsz 'vd, 'vn, 'vm");
|
|
res = bit_cast<int32_t, float>(vn_flt / vm_flt);
|
|
} else if ((U == 0) && (opcode == 0x1c)) {
|
|
// Format(instr, "vceq'vsz 'vd, 'vn, 'vm");
|
|
res = (vn_flt == vm_flt) ? 0xffffffff : 0;
|
|
} else if ((U == 1) && (opcode == 0x1c)) {
|
|
if (instr->Bit(23) == 1) {
|
|
// Format(instr, "vcgt'vsz 'vd, 'vn, 'vm");
|
|
res = (vn_flt > vm_flt) ? 0xffffffff : 0;
|
|
} else {
|
|
// Format(instr, "vcge'vsz 'vd, 'vn, 'vm");
|
|
res = (vn_flt >= vm_flt) ? 0xffffffff : 0;
|
|
}
|
|
} else if ((U == 0) && (opcode == 0x1e)) {
|
|
if (instr->Bit(23) == 1) {
|
|
// Format(instr, "vmin'vsz 'vd, 'vn, 'vm");
|
|
const float m = (vn_flt > vm_flt) ? vm_flt : vn_flt;
|
|
res = bit_cast<int32_t, float>(m);
|
|
} else {
|
|
// Format(instr, "vmax'vsz 'vd, 'vn, 'vm");
|
|
const float m = (vn_flt < vm_flt) ? vm_flt : vn_flt;
|
|
res = bit_cast<int32_t, float>(m);
|
|
}
|
|
} else if ((U == 0) && (opcode == 0x1f)) {
|
|
if (instr->Bit(23) == 0) {
|
|
// Format(instr, "vrecps'vsz 'vd, 'vn, 'vm");
|
|
res = bit_cast<int32_t, float>(2.0 - (vn_flt * vm_flt));
|
|
} else {
|
|
// Format(instr, "vrsqrt'vsz 'vd, 'vn, 'vm");
|
|
res = bit_cast<int32_t, float>((3.0 - vn_flt * vm_flt) / 2.0);
|
|
}
|
|
} else {
|
|
UnimplementedInstruction(instr);
|
|
return;
|
|
}
|
|
set_vregisters(vd, idx, res);
|
|
}
|
|
} else {
|
|
// f64 case.
|
|
for (int idx = 0; idx < 2; idx++) {
|
|
const int64_t vn_val = get_vregisterd(vn, idx);
|
|
const int64_t vm_val = get_vregisterd(vm, idx);
|
|
const double vn_dbl = bit_cast<double, int64_t>(vn_val);
|
|
const double vm_dbl = bit_cast<double, int64_t>(vm_val);
|
|
int64_t res = 0.0;
|
|
if ((U == 0) && (opcode == 0x3)) {
|
|
if (instr->Bit(23) == 0) {
|
|
// Format(instr, "vand 'vd, 'vn, 'vm");
|
|
res = vn_val & vm_val;
|
|
} else {
|
|
// Format(instr, "vorr 'vd, 'vn, 'vm");
|
|
res = vn_val | vm_val;
|
|
}
|
|
} else if ((U == 1) && (opcode == 0x3)) {
|
|
// Format(instr, "veor 'vd, 'vn, 'vm");
|
|
res = vn_val ^ vm_val;
|
|
} else if ((U == 0) && (opcode == 0x10)) {
|
|
// Format(instr, "vadd'vsz 'vd, 'vn, 'vm");
|
|
res = vn_val + vm_val;
|
|
} else if ((U == 1) && (opcode == 0x10)) {
|
|
// Format(instr, "vsub'vsz 'vd, 'vn, 'vm");
|
|
res = vn_val - vm_val;
|
|
} else if ((U == 0) && (opcode == 0x1a)) {
|
|
if (instr->Bit(23) == 0) {
|
|
// Format(instr, "vadd'vsz 'vd, 'vn, 'vm");
|
|
res = bit_cast<int64_t, double>(vn_dbl + vm_dbl);
|
|
} else {
|
|
// Format(instr, "vsub'vsz 'vd, 'vn, 'vm");
|
|
res = bit_cast<int64_t, double>(vn_dbl - vm_dbl);
|
|
}
|
|
} else if ((U == 1) && (opcode == 0x1b)) {
|
|
// Format(instr, "vmul'vsz 'vd, 'vn, 'vm");
|
|
res = bit_cast<int64_t, double>(vn_dbl * vm_dbl);
|
|
} else if ((U == 1) && (opcode == 0x1f)) {
|
|
// Format(instr, "vdiv'vsz 'vd, 'vn, 'vm");
|
|
res = bit_cast<int64_t, double>(vn_dbl / vm_dbl);
|
|
} else if ((U == 0) && (opcode == 0x1c)) {
|
|
// Format(instr, "vceq'vsz 'vd, 'vn, 'vm");
|
|
res = (vn_dbl == vm_dbl) ? 0xffffffffffffffffLL : 0;
|
|
} else if ((U == 1) && (opcode == 0x1c)) {
|
|
if (instr->Bit(23) == 1) {
|
|
// Format(instr, "vcgt'vsz 'vd, 'vn, 'vm");
|
|
res = (vn_dbl > vm_dbl) ? 0xffffffffffffffffLL : 0;
|
|
} else {
|
|
// Format(instr, "vcge'vsz 'vd, 'vn, 'vm");
|
|
res = (vn_dbl >= vm_dbl) ? 0xffffffffffffffffLL : 0;
|
|
}
|
|
} else if ((U == 0) && (opcode == 0x1e)) {
|
|
if (instr->Bit(23) == 1) {
|
|
// Format(instr, "vmin'vsz 'vd, 'vn, 'vm");
|
|
const double m = (vn_dbl > vm_dbl) ? vm_dbl : vn_dbl;
|
|
res = bit_cast<int64_t, double>(m);
|
|
} else {
|
|
// Format(instr, "vmax'vsz 'vd, 'vn, 'vm");
|
|
const double m = (vn_dbl < vm_dbl) ? vm_dbl : vn_dbl;
|
|
res = bit_cast<int64_t, double>(m);
|
|
}
|
|
} else {
|
|
UnimplementedInstruction(instr);
|
|
return;
|
|
}
|
|
set_vregisterd(vd, idx, res);
|
|
}
|
|
}
|
|
}
|
|
|
|
static float arm_reciprocal_sqrt_estimate(float a) {
|
|
// From the ARM Architecture Reference Manual A2-87.
|
|
if (isinf(a) || (fabs(a) >= exp2f(126)))
|
|
return 0.0;
|
|
else if (a == 0.0)
|
|
return kPosInfinity;
|
|
else if (isnan(a))
|
|
return a;
|
|
|
|
uint32_t a_bits = bit_cast<uint32_t, float>(a);
|
|
uint64_t scaled;
|
|
if (((a_bits >> 23) & 1) != 0) {
|
|
// scaled = '0 01111111101' : operand<22:0> : Zeros(29)
|
|
scaled = (static_cast<uint64_t>(0x3fd) << 52) |
|
|
((static_cast<uint64_t>(a_bits) & 0x7fffff) << 29);
|
|
} else {
|
|
// scaled = '0 01111111110' : operand<22:0> : Zeros(29)
|
|
scaled = (static_cast<uint64_t>(0x3fe) << 52) |
|
|
((static_cast<uint64_t>(a_bits) & 0x7fffff) << 29);
|
|
}
|
|
// result_exp = (380 - UInt(operand<30:23>) DIV 2;
|
|
int32_t result_exp = (380 - ((a_bits >> 23) & 0xff)) / 2;
|
|
|
|
double scaled_d = bit_cast<double, uint64_t>(scaled);
|
|
ASSERT((scaled_d >= 0.25) && (scaled_d < 1.0));
|
|
|
|
double r;
|
|
if (scaled_d < 0.5) {
|
|
// range 0.25 <= a < 0.5
|
|
|
|
// a in units of 1/512 rounded down.
|
|
int32_t q0 = static_cast<int32_t>(scaled_d * 512.0);
|
|
// reciprocal root r.
|
|
r = 1.0 / sqrt((static_cast<double>(q0) + 0.5) / 512.0);
|
|
} else {
|
|
// range 0.5 <= a < 1.0
|
|
|
|
// a in units of 1/256 rounded down.
|
|
int32_t q1 = static_cast<int32_t>(scaled_d * 256.0);
|
|
// reciprocal root r.
|
|
r = 1.0 / sqrt((static_cast<double>(q1) + 0.5) / 256.0);
|
|
}
|
|
// r in units of 1/256 rounded to nearest.
|
|
int32_t s = static_cast<int>(256.0 * r + 0.5);
|
|
double estimate = static_cast<double>(s) / 256.0;
|
|
ASSERT((estimate >= 1.0) && (estimate <= (511.0 / 256.0)));
|
|
|
|
// result = 0 : result_exp<7:0> : estimate<51:29>
|
|
int32_t result_bits =
|
|
((result_exp & 0xff) << 23) |
|
|
((bit_cast<uint64_t, double>(estimate) >> 29) & 0x7fffff);
|
|
return bit_cast<float, int32_t>(result_bits);
|
|
}
|
|
|
|
static float arm_recip_estimate(float a) {
|
|
// From the ARM Architecture Reference Manual A2-85.
|
|
if (isinf(a) || (fabs(a) >= exp2f(126)))
|
|
return 0.0;
|
|
else if (a == 0.0)
|
|
return kPosInfinity;
|
|
else if (isnan(a))
|
|
return a;
|
|
|
|
uint32_t a_bits = bit_cast<uint32_t, float>(a);
|
|
// scaled = '0011 1111 1110' : a<22:0> : Zeros(29)
|
|
uint64_t scaled = (static_cast<uint64_t>(0x3fe) << 52) |
|
|
((static_cast<uint64_t>(a_bits) & 0x7fffff) << 29);
|
|
// result_exp = 253 - UInt(a<30:23>)
|
|
int32_t result_exp = 253 - ((a_bits >> 23) & 0xff);
|
|
ASSERT((result_exp >= 1) && (result_exp <= 252));
|
|
|
|
double scaled_d = bit_cast<double, uint64_t>(scaled);
|
|
ASSERT((scaled_d >= 0.5) && (scaled_d < 1.0));
|
|
|
|
// a in units of 1/512 rounded down.
|
|
int32_t q = static_cast<int32_t>(scaled_d * 512.0);
|
|
// reciprocal r.
|
|
double r = 1.0 / ((static_cast<double>(q) + 0.5) / 512.0);
|
|
// r in units of 1/256 rounded to nearest.
|
|
int32_t s = static_cast<int32_t>(256.0 * r + 0.5);
|
|
double estimate = static_cast<double>(s) / 256.0;
|
|
ASSERT((estimate >= 1.0) && (estimate <= (511.0 / 256.0)));
|
|
|
|
// result = sign : result_exp<7:0> : estimate<51:29>
|
|
int32_t result_bits =
|
|
(a_bits & 0x80000000) | ((result_exp & 0xff) << 23) |
|
|
((bit_cast<uint64_t, double>(estimate) >> 29) & 0x7fffff);
|
|
return bit_cast<float, int32_t>(result_bits);
|
|
}
|
|
|
|
void Simulator::DecodeSIMDTwoReg(Instr* instr) {
|
|
const int32_t Q = instr->Bit(30);
|
|
const int32_t U = instr->Bit(29);
|
|
const int32_t op = instr->Bits(12, 5);
|
|
const int32_t sz = instr->Bits(22, 2);
|
|
const VRegister vd = instr->VdField();
|
|
const VRegister vn = instr->VnField();
|
|
|
|
if (Q != 1) {
|
|
UnimplementedInstruction(instr);
|
|
return;
|
|
}
|
|
|
|
if ((U == 1) && (op == 5)) {
|
|
// Format(instr, "vnot 'vd, 'vn");
|
|
for (int i = 0; i < 2; i++) {
|
|
set_vregisterd(vd, i, ~get_vregisterd(vn, i));
|
|
}
|
|
} else if ((U == 0) && (op == 0xf)) {
|
|
if (sz == 2) {
|
|
// Format(instr, "vabss 'vd, 'vn");
|
|
for (int i = 0; i < 4; i++) {
|
|
const int32_t vn_val = get_vregisters(vn, i);
|
|
const float vn_flt = bit_cast<float, int32_t>(vn_val);
|
|
set_vregisters(vd, i, bit_cast<int32_t, float>(fabsf(vn_flt)));
|
|
}
|
|
} else if (sz == 3) {
|
|
// Format(instr, "vabsd 'vd, 'vn");
|
|
for (int i = 0; i < 2; i++) {
|
|
const int64_t vn_val = get_vregisterd(vn, i);
|
|
const double vn_dbl = bit_cast<double, int64_t>(vn_val);
|
|
set_vregisterd(vd, i, bit_cast<int64_t, double>(fabs(vn_dbl)));
|
|
}
|
|
} else {
|
|
UnimplementedInstruction(instr);
|
|
}
|
|
} else if ((U == 1) && (op == 0xf)) {
|
|
if (sz == 2) {
|
|
// Format(instr, "vnegs 'vd, 'vn");
|
|
for (int i = 0; i < 4; i++) {
|
|
const int32_t vn_val = get_vregisters(vn, i);
|
|
const float vn_flt = bit_cast<float, int32_t>(vn_val);
|
|
set_vregisters(vd, i, bit_cast<int32_t, float>(-vn_flt));
|
|
}
|
|
} else if (sz == 3) {
|
|
// Format(instr, "vnegd 'vd, 'vn");
|
|
for (int i = 0; i < 2; i++) {
|
|
const int64_t vn_val = get_vregisterd(vn, i);
|
|
const double vn_dbl = bit_cast<double, int64_t>(vn_val);
|
|
set_vregisterd(vd, i, bit_cast<int64_t, double>(-vn_dbl));
|
|
}
|
|
} else {
|
|
UnimplementedInstruction(instr);
|
|
}
|
|
} else if ((U == 1) && (op == 0x1f)) {
|
|
if (sz == 2) {
|
|
// Format(instr, "vsqrts 'vd, 'vn");
|
|
for (int i = 0; i < 4; i++) {
|
|
const int32_t vn_val = get_vregisters(vn, i);
|
|
const float vn_flt = bit_cast<float, int32_t>(vn_val);
|
|
set_vregisters(vd, i, bit_cast<int32_t, float>(sqrtf(vn_flt)));
|
|
}
|
|
} else if (sz == 3) {
|
|
// Format(instr, "vsqrtd 'vd, 'vn");
|
|
for (int i = 0; i < 2; i++) {
|
|
const int64_t vn_val = get_vregisterd(vn, i);
|
|
const double vn_dbl = bit_cast<double, int64_t>(vn_val);
|
|
set_vregisterd(vd, i, bit_cast<int64_t, double>(sqrt(vn_dbl)));
|
|
}
|
|
} else {
|
|
UnimplementedInstruction(instr);
|
|
}
|
|
} else if ((U == 0) && (op == 0x1d)) {
|
|
if (sz != 2) {
|
|
UnimplementedInstruction(instr);
|
|
return;
|
|
}
|
|
// Format(instr, "vrecpes 'vd, 'vn");
|
|
for (int i = 0; i < 4; i++) {
|
|
const int32_t vn_val = get_vregisters(vn, i);
|
|
const float vn_flt = bit_cast<float, int32_t>(vn_val);
|
|
const float re = arm_recip_estimate(vn_flt);
|
|
set_vregisters(vd, i, bit_cast<int32_t, float>(re));
|
|
}
|
|
} else if ((U == 1) && (op == 0x1d)) {
|
|
if (sz != 2) {
|
|
UnimplementedInstruction(instr);
|
|
return;
|
|
}
|
|
// Format(instr, "vrsqrtes 'vd, 'vn");
|
|
for (int i = 0; i < 4; i++) {
|
|
const int32_t vn_val = get_vregisters(vn, i);
|
|
const float vn_flt = bit_cast<float, int32_t>(vn_val);
|
|
const float re = arm_reciprocal_sqrt_estimate(vn_flt);
|
|
set_vregisters(vd, i, bit_cast<int32_t, float>(re));
|
|
}
|
|
} else {
|
|
UnimplementedInstruction(instr);
|
|
}
|
|
}
|
|
|
|
void Simulator::DecodeDPSimd1(Instr* instr) {
|
|
if (instr->IsSIMDCopyOp()) {
|
|
DecodeSIMDCopy(instr);
|
|
} else if (instr->IsSIMDThreeSameOp()) {
|
|
DecodeSIMDThreeSame(instr);
|
|
} else if (instr->IsSIMDTwoRegOp()) {
|
|
DecodeSIMDTwoReg(instr);
|
|
} else {
|
|
UnimplementedInstruction(instr);
|
|
}
|
|
}
|
|
|
|
void Simulator::DecodeFPImm(Instr* instr) {
|
|
if ((instr->Bit(31) != 0) || (instr->Bit(29) != 0) || (instr->Bit(23) != 0) ||
|
|
(instr->Bits(5, 5) != 0)) {
|
|
UnimplementedInstruction(instr);
|
|
return;
|
|
}
|
|
if (instr->Bit(22) == 1) {
|
|
// Double.
|
|
// Format(instr, "fmovd 'vd, #'immd");
|
|
const VRegister vd = instr->VdField();
|
|
const int64_t immd = Instr::VFPExpandImm(instr->Imm8Field());
|
|
set_vregisterd(vd, 0, immd);
|
|
set_vregisterd(vd, 1, 0);
|
|
} else {
|
|
// Single.
|
|
UnimplementedInstruction(instr);
|
|
}
|
|
}
|
|
|
|
void Simulator::DecodeFPIntCvt(Instr* instr) {
|
|
const VRegister vd = instr->VdField();
|
|
const VRegister vn = instr->VnField();
|
|
const Register rd = instr->RdField();
|
|
const Register rn = instr->RnField();
|
|
|
|
if (instr->Bit(29) != 0) {
|
|
UnimplementedInstruction(instr);
|
|
return;
|
|
}
|
|
|
|
if ((instr->SFField() == 0) && (instr->Bits(22, 2) == 0)) {
|
|
if (instr->Bits(16, 5) == 6) {
|
|
// Format(instr, "fmovrs'sf 'rd, 'vn");
|
|
const int32_t vn_val = get_vregisters(vn, 0);
|
|
set_wregister(rd, vn_val, R31IsZR);
|
|
} else if (instr->Bits(16, 5) == 7) {
|
|
// Format(instr, "fmovsr'sf 'vd, 'rn");
|
|
const int32_t rn_val = get_wregister(rn, R31IsZR);
|
|
set_vregisters(vd, 0, rn_val);
|
|
set_vregisters(vd, 1, 0);
|
|
set_vregisters(vd, 2, 0);
|
|
set_vregisters(vd, 3, 0);
|
|
} else {
|
|
UnimplementedInstruction(instr);
|
|
}
|
|
} else if (instr->Bits(22, 2) == 1) {
|
|
if (instr->Bits(16, 5) == 2) {
|
|
// Format(instr, "scvtfd'sf 'vd, 'rn");
|
|
const int64_t rn_val64 = get_register(rn, instr->RnMode());
|
|
const int32_t rn_val32 = get_wregister(rn, instr->RnMode());
|
|
const double vn_dbl = (instr->SFField() == 1)
|
|
? static_cast<double>(rn_val64)
|
|
: static_cast<double>(rn_val32);
|
|
set_vregisterd(vd, 0, bit_cast<int64_t, double>(vn_dbl));
|
|
set_vregisterd(vd, 1, 0);
|
|
} else if (instr->Bits(16, 5) == 6) {
|
|
// Format(instr, "fmovrd'sf 'rd, 'vn");
|
|
const int64_t vn_val = get_vregisterd(vn, 0);
|
|
set_register(instr, rd, vn_val, R31IsZR);
|
|
} else if (instr->Bits(16, 5) == 7) {
|
|
// Format(instr, "fmovdr'sf 'vd, 'rn");
|
|
const int64_t rn_val = get_register(rn, R31IsZR);
|
|
set_vregisterd(vd, 0, rn_val);
|
|
set_vregisterd(vd, 1, 0);
|
|
} else if (instr->Bits(16, 5) == 24) {
|
|
// Format(instr, "fcvtzds'sf 'rd, 'vn");
|
|
const double vn_val = bit_cast<double, int64_t>(get_vregisterd(vn, 0));
|
|
if (vn_val >= static_cast<double>(INT64_MAX)) {
|
|
set_register(instr, rd, INT64_MAX, instr->RdMode());
|
|
} else if (vn_val <= static_cast<double>(INT64_MIN)) {
|
|
set_register(instr, rd, INT64_MIN, instr->RdMode());
|
|
} else {
|
|
set_register(instr, rd, static_cast<int64_t>(vn_val), instr->RdMode());
|
|
}
|
|
} else {
|
|
UnimplementedInstruction(instr);
|
|
}
|
|
} else {
|
|
UnimplementedInstruction(instr);
|
|
}
|
|
}
|
|
|
|
void Simulator::DecodeFPOneSource(Instr* instr) {
|
|
const int opc = instr->Bits(15, 6);
|
|
const VRegister vd = instr->VdField();
|
|
const VRegister vn = instr->VnField();
|
|
const int64_t vn_val = get_vregisterd(vn, 0);
|
|
const int32_t vn_val32 = vn_val & kWRegMask;
|
|
const double vn_dbl = bit_cast<double, int64_t>(vn_val);
|
|
const float vn_flt = bit_cast<float, int32_t>(vn_val32);
|
|
|
|
if ((opc != 5) && (instr->Bit(22) != 1)) {
|
|
// Source is interpreted as single-precision only if we're doing a
|
|
// conversion from single -> double.
|
|
UnimplementedInstruction(instr);
|
|
return;
|
|
}
|
|
|
|
int64_t res_val = 0;
|
|
switch (opc) {
|
|
case 0:
|
|
// Format("fmovdd 'vd, 'vn");
|
|
res_val = get_vregisterd(vn, 0);
|
|
break;
|
|
case 1:
|
|
// Format("fabsd 'vd, 'vn");
|
|
res_val = bit_cast<int64_t, double>(fabs(vn_dbl));
|
|
break;
|
|
case 2:
|
|
// Format("fnegd 'vd, 'vn");
|
|
res_val = bit_cast<int64_t, double>(-vn_dbl);
|
|
break;
|
|
case 3:
|
|
// Format("fsqrtd 'vd, 'vn");
|
|
res_val = bit_cast<int64_t, double>(sqrt(vn_dbl));
|
|
break;
|
|
case 4: {
|
|
// Format(instr, "fcvtsd 'vd, 'vn");
|
|
const uint32_t val =
|
|
bit_cast<uint32_t, float>(static_cast<float>(vn_dbl));
|
|
res_val = static_cast<int64_t>(val);
|
|
break;
|
|
}
|
|
case 5:
|
|
// Format(instr, "fcvtds 'vd, 'vn");
|
|
res_val = bit_cast<int64_t, double>(static_cast<double>(vn_flt));
|
|
break;
|
|
default:
|
|
UnimplementedInstruction(instr);
|
|
break;
|
|
}
|
|
|
|
set_vregisterd(vd, 0, res_val);
|
|
set_vregisterd(vd, 1, 0);
|
|
}
|
|
|
|
void Simulator::DecodeFPTwoSource(Instr* instr) {
|
|
if (instr->Bits(22, 2) != 1) {
|
|
UnimplementedInstruction(instr);
|
|
return;
|
|
}
|
|
const VRegister vd = instr->VdField();
|
|
const VRegister vn = instr->VnField();
|
|
const VRegister vm = instr->VmField();
|
|
const double vn_val = bit_cast<double, int64_t>(get_vregisterd(vn, 0));
|
|
const double vm_val = bit_cast<double, int64_t>(get_vregisterd(vm, 0));
|
|
const int opc = instr->Bits(12, 4);
|
|
double result;
|
|
|
|
switch (opc) {
|
|
case 0:
|
|
// Format(instr, "fmuld 'vd, 'vn, 'vm");
|
|
result = vn_val * vm_val;
|
|
break;
|
|
case 1:
|
|
// Format(instr, "fdivd 'vd, 'vn, 'vm");
|
|
result = vn_val / vm_val;
|
|
break;
|
|
case 2:
|
|
// Format(instr, "faddd 'vd, 'vn, 'vm");
|
|
result = vn_val + vm_val;
|
|
break;
|
|
case 3:
|
|
// Format(instr, "fsubd 'vd, 'vn, 'vm");
|
|
result = vn_val - vm_val;
|
|
break;
|
|
default:
|
|
UnimplementedInstruction(instr);
|
|
return;
|
|
}
|
|
|
|
set_vregisterd(vd, 0, bit_cast<int64_t, double>(result));
|
|
set_vregisterd(vd, 1, 0);
|
|
}
|
|
|
|
void Simulator::DecodeFPCompare(Instr* instr) {
|
|
const VRegister vn = instr->VnField();
|
|
const VRegister vm = instr->VmField();
|
|
const double vn_val = bit_cast<double, int64_t>(get_vregisterd(vn, 0));
|
|
double vm_val;
|
|
|
|
if ((instr->Bit(22) == 1) && (instr->Bits(3, 2) == 0)) {
|
|
// Format(instr, "fcmpd 'vn, 'vm");
|
|
vm_val = bit_cast<double, int64_t>(get_vregisterd(vm, 0));
|
|
} else if ((instr->Bit(22) == 1) && (instr->Bits(3, 2) == 1)) {
|
|
if (instr->VmField() == V0) {
|
|
// Format(instr, "fcmpd 'vn, #0.0");
|
|
vm_val = 0.0;
|
|
} else {
|
|
UnimplementedInstruction(instr);
|
|
return;
|
|
}
|
|
} else {
|
|
UnimplementedInstruction(instr);
|
|
return;
|
|
}
|
|
|
|
n_flag_ = false;
|
|
z_flag_ = false;
|
|
c_flag_ = false;
|
|
v_flag_ = false;
|
|
|
|
if (isnan(vn_val) || isnan(vm_val)) {
|
|
c_flag_ = true;
|
|
v_flag_ = true;
|
|
} else if (vn_val == vm_val) {
|
|
z_flag_ = true;
|
|
c_flag_ = true;
|
|
} else if (vn_val < vm_val) {
|
|
n_flag_ = true;
|
|
} else {
|
|
c_flag_ = true;
|
|
}
|
|
}
|
|
|
|
void Simulator::DecodeFP(Instr* instr) {
|
|
if (instr->IsFPImmOp()) {
|
|
DecodeFPImm(instr);
|
|
} else if (instr->IsFPIntCvtOp()) {
|
|
DecodeFPIntCvt(instr);
|
|
} else if (instr->IsFPOneSourceOp()) {
|
|
DecodeFPOneSource(instr);
|
|
} else if (instr->IsFPTwoSourceOp()) {
|
|
DecodeFPTwoSource(instr);
|
|
} else if (instr->IsFPCompareOp()) {
|
|
DecodeFPCompare(instr);
|
|
} else {
|
|
UnimplementedInstruction(instr);
|
|
}
|
|
}
|
|
|
|
void Simulator::DecodeDPSimd2(Instr* instr) {
|
|
if (instr->IsFPOp()) {
|
|
DecodeFP(instr);
|
|
} else {
|
|
UnimplementedInstruction(instr);
|
|
}
|
|
}
|
|
|
|
// Executes the current instruction.
|
|
void Simulator::InstructionDecode(Instr* instr) {
|
|
pc_modified_ = false;
|
|
if (IsTracingExecution()) {
|
|
THR_Print("%" Pu64 " ", icount_);
|
|
const uword start = reinterpret_cast<uword>(instr);
|
|
const uword end = start + Instr::kInstrSize;
|
|
if (FLAG_support_disassembler) {
|
|
Disassembler::Disassemble(start, end);
|
|
} else {
|
|
THR_Print("Disassembler not supported in this mode.\n");
|
|
}
|
|
}
|
|
|
|
if (instr->IsDPImmediateOp()) {
|
|
DecodeDPImmediate(instr);
|
|
} else if (instr->IsCompareBranchOp()) {
|
|
DecodeCompareBranch(instr);
|
|
} else if (instr->IsLoadStoreOp()) {
|
|
DecodeLoadStore(instr);
|
|
} else if (instr->IsDPRegisterOp()) {
|
|
DecodeDPRegister(instr);
|
|
} else if (instr->IsDPSimd1Op()) {
|
|
DecodeDPSimd1(instr);
|
|
} else if (instr->IsDPSimd2Op()) {
|
|
DecodeDPSimd2(instr);
|
|
} else {
|
|
UnimplementedInstruction(instr);
|
|
}
|
|
|
|
if (!pc_modified_) {
|
|
set_pc(reinterpret_cast<int64_t>(instr) + Instr::kInstrSize);
|
|
}
|
|
}
|
|
|
|
void Simulator::Execute() {
|
|
// 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.
|
|
uword program_counter = get_pc();
|
|
|
|
if (FLAG_stop_sim_at == ULLONG_MAX) {
|
|
// Fast version of the dispatch loop without checking whether the simulator
|
|
// should be stopping at a particular executed instruction.
|
|
while (program_counter != kEndSimulatingPC) {
|
|
Instr* instr = reinterpret_cast<Instr*>(program_counter);
|
|
icount_++;
|
|
if (IsIllegalAddress(program_counter)) {
|
|
HandleIllegalAccess(program_counter, instr);
|
|
} else {
|
|
InstructionDecode(instr);
|
|
}
|
|
program_counter = get_pc();
|
|
}
|
|
} else {
|
|
// FLAG_stop_sim_at is at the non-default value. Stop in the debugger when
|
|
// we reach the particular instruction count or address.
|
|
while (program_counter != kEndSimulatingPC) {
|
|
Instr* instr = reinterpret_cast<Instr*>(program_counter);
|
|
icount_++;
|
|
if (icount_ == FLAG_stop_sim_at) {
|
|
SimulatorDebugger dbg(this);
|
|
dbg.Stop(instr, "Instruction count reached");
|
|
} else if (reinterpret_cast<uint64_t>(instr) == FLAG_stop_sim_at) {
|
|
SimulatorDebugger dbg(this);
|
|
dbg.Stop(instr, "Instruction address reached");
|
|
} else if (IsIllegalAddress(program_counter)) {
|
|
HandleIllegalAccess(program_counter, instr);
|
|
} else {
|
|
InstructionDecode(instr);
|
|
}
|
|
program_counter = get_pc();
|
|
}
|
|
}
|
|
}
|
|
|
|
int64_t Simulator::Call(int64_t entry,
|
|
int64_t parameter0,
|
|
int64_t parameter1,
|
|
int64_t parameter2,
|
|
int64_t parameter3,
|
|
bool fp_return,
|
|
bool fp_args) {
|
|
// Save the SP register before the call so we can restore it.
|
|
const intptr_t sp_before_call = get_register(R31, R31IsSP);
|
|
|
|
// Setup parameters.
|
|
if (fp_args) {
|
|
set_vregisterd(V0, 0, parameter0);
|
|
set_vregisterd(V0, 1, 0);
|
|
set_vregisterd(V1, 0, parameter1);
|
|
set_vregisterd(V1, 1, 0);
|
|
set_vregisterd(V2, 0, parameter2);
|
|
set_vregisterd(V2, 1, 0);
|
|
set_vregisterd(V3, 0, parameter3);
|
|
set_vregisterd(V3, 1, 0);
|
|
} else {
|
|
set_register(NULL, R0, parameter0);
|
|
set_register(NULL, R1, parameter1);
|
|
set_register(NULL, R2, parameter2);
|
|
set_register(NULL, R3, parameter3);
|
|
}
|
|
|
|
// Make sure the activation frames are properly aligned.
|
|
intptr_t stack_pointer = sp_before_call;
|
|
if (OS::ActivationFrameAlignment() > 1) {
|
|
stack_pointer =
|
|
Utils::RoundDown(stack_pointer, OS::ActivationFrameAlignment());
|
|
}
|
|
set_register(NULL, R31, stack_pointer, R31IsSP);
|
|
|
|
// Prepare to execute the code at entry.
|
|
set_pc(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.
|
|
set_register(NULL, LR, kEndSimulatingPC);
|
|
|
|
// Remember the values of callee-saved registers, and set them up with a
|
|
// known value so that we are able to check that they are preserved
|
|
// properly across Dart execution.
|
|
int64_t preserved_vals[kAbiPreservedCpuRegCount];
|
|
const double dicount = static_cast<double>(icount_);
|
|
const int64_t callee_saved_value = bit_cast<int64_t, double>(dicount);
|
|
for (int i = kAbiFirstPreservedCpuReg; i <= kAbiLastPreservedCpuReg; i++) {
|
|
const Register r = static_cast<Register>(i);
|
|
preserved_vals[i - kAbiFirstPreservedCpuReg] = get_register(r);
|
|
set_register(NULL, r, callee_saved_value);
|
|
}
|
|
|
|
// Only the bottom half of the V registers must be preserved.
|
|
int64_t preserved_dvals[kAbiPreservedFpuRegCount];
|
|
for (int i = kAbiFirstPreservedFpuReg; i <= kAbiLastPreservedFpuReg; i++) {
|
|
const VRegister r = static_cast<VRegister>(i);
|
|
preserved_dvals[i - kAbiFirstPreservedFpuReg] = get_vregisterd(r, 0);
|
|
set_vregisterd(r, 0, callee_saved_value);
|
|
set_vregisterd(r, 1, 0);
|
|
}
|
|
|
|
// Start the simulation.
|
|
Execute();
|
|
|
|
// Check that the callee-saved registers have been preserved,
|
|
// and restore them with the original value.
|
|
for (int i = kAbiFirstPreservedCpuReg; i <= kAbiLastPreservedCpuReg; i++) {
|
|
const Register r = static_cast<Register>(i);
|
|
ASSERT(callee_saved_value == get_register(r));
|
|
set_register(NULL, r, preserved_vals[i - kAbiFirstPreservedCpuReg]);
|
|
}
|
|
|
|
for (int i = kAbiFirstPreservedFpuReg; i <= kAbiLastPreservedFpuReg; i++) {
|
|
const VRegister r = static_cast<VRegister>(i);
|
|
ASSERT(callee_saved_value == get_vregisterd(r, 0));
|
|
set_vregisterd(r, 0, preserved_dvals[i - kAbiFirstPreservedFpuReg]);
|
|
set_vregisterd(r, 1, 0);
|
|
}
|
|
|
|
// Restore the SP register and return R0.
|
|
set_register(NULL, R31, sp_before_call, R31IsSP);
|
|
int64_t return_value;
|
|
if (fp_return) {
|
|
return_value = get_vregisterd(V0, 0);
|
|
} else {
|
|
return_value = get_register(R0);
|
|
}
|
|
return return_value;
|
|
}
|
|
|
|
void Simulator::JumpToFrame(uword pc, uword sp, uword fp, Thread* thread) {
|
|
// Walk over all setjmp buffers (simulated --> C++ transitions)
|
|
// and try to find the setjmp associated with the simulated stack pointer.
|
|
SimulatorSetjmpBuffer* buf = last_setjmp_buffer();
|
|
while (buf->link() != NULL && buf->link()->sp() <= sp) {
|
|
buf = buf->link();
|
|
}
|
|
ASSERT(buf != NULL);
|
|
|
|
// The C++ caller has not cleaned up the stack memory of C++ frames.
|
|
// Prepare for unwinding frames by destroying all the stack resources
|
|
// in the previous C++ frames.
|
|
StackResource::Unwind(thread);
|
|
|
|
// Unwind the C++ stack and continue simulation in the target frame.
|
|
set_pc(static_cast<int64_t>(pc));
|
|
set_register(NULL, SP, static_cast<int64_t>(sp));
|
|
set_register(NULL, FP, static_cast<int64_t>(fp));
|
|
set_register(NULL, THR, reinterpret_cast<int64_t>(thread));
|
|
// Set the tag.
|
|
thread->set_vm_tag(VMTag::kDartCompiledTagId);
|
|
// Clear top exit frame.
|
|
thread->set_top_exit_frame_info(0);
|
|
// Restore pool pointer.
|
|
int64_t code =
|
|
*reinterpret_cast<int64_t*>(fp + kPcMarkerSlotFromFp * kWordSize);
|
|
int64_t pp = (FLAG_precompiled_mode && FLAG_use_bare_instructions)
|
|
? reinterpret_cast<int64_t>(thread->global_object_pool())
|
|
: *reinterpret_cast<int64_t*>(
|
|
code + Code::object_pool_offset() - kHeapObjectTag);
|
|
pp -= kHeapObjectTag; // In the PP register, the pool pointer is untagged.
|
|
set_register(NULL, CODE_REG, code);
|
|
set_register(NULL, PP, pp);
|
|
buf->Longjmp();
|
|
}
|
|
|
|
} // namespace dart
|
|
|
|
#endif // !defined(USING_SIMULATOR)
|
|
|
|
#endif // defined TARGET_ARCH_ARM64
|