yuzu/src/core/arm/interpreter/arm_interpreter.cpp

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// Copyright 2014 Citra Emulator Project
// Licensed under GPLv2
// Refer to the license.txt file included.
2014-05-16 06:51:45 +02:00
#include "core/arm/interpreter/arm_interpreter.h"
const static cpu_config_t s_arm11_cpu_info = {
"armv6", "arm11", 0x0007b000, 0x0007f000, NONCACHE
};
ARM_Interpreter::ARM_Interpreter() {
m_state = new ARMul_State;
ARMul_EmulateInit();
ARMul_NewState(m_state);
m_state->abort_model = 0;
m_state->cpu = (cpu_config_t*)&s_arm11_cpu_info;
m_state->bigendSig = LOW;
ARMul_SelectProcessor(m_state, ARM_v6_Prop | ARM_v5_Prop | ARM_v5e_Prop);
m_state->lateabtSig = LOW;
mmu_init(m_state);
// Reset the core to initial state
ARMul_Reset(m_state);
m_state->NextInstr = 0;
m_state->Emulate = 3;
m_state->pc = m_state->Reg[15] = 0x00000000;
m_state->Reg[13] = 0x10000000; // Set stack pointer to the top of the stack
}
ARM_Interpreter::~ARM_Interpreter() {
delete m_state;
}
/**
* Set the Program Counter to an address
* @param addr Address to set PC to
*/
void ARM_Interpreter::SetPC(u32 pc) {
m_state->pc = m_state->Reg[15] = pc;
}
/*
* Get the current Program Counter
* @return Returns current PC
*/
u32 ARM_Interpreter::GetPC() const {
return m_state->pc;
}
/**
* Get an ARM register
* @param index Register index (0-15)
* @return Returns the value in the register
*/
u32 ARM_Interpreter::GetReg(int index) const {
return m_state->Reg[index];
}
/**
* Set an ARM register
* @param index Register index (0-15)
* @param value Value to set register to
*/
void ARM_Interpreter::SetReg(int index, u32 value) {
m_state->Reg[index] = value;
}
/**
* Get the current CPSR register
* @return Returns the value of the CPSR register
*/
u32 ARM_Interpreter::GetCPSR() const {
return m_state->Cpsr;
}
/**
* Set the current CPSR register
* @param cpsr Value to set CPSR to
*/
void ARM_Interpreter::SetCPSR(u32 cpsr) {
m_state->Cpsr = cpsr;
}
/**
* Returns the number of clock ticks since the last reset
* @return Returns number of clock ticks
*/
u64 ARM_Interpreter::GetTicks() const {
return ARMul_Time(m_state);
}
/**
* Executes the given number of instructions
* @param num_instructions Number of instructions to executes
*/
void ARM_Interpreter::ExecuteInstructions(int num_instructions) {
m_state->NumInstrsToExecute = num_instructions;
ARMul_Emulate32(m_state);
}
/**
* Saves the current CPU context
* @param ctx Thread context to save
* @todo Do we need to save Reg[15] and NextInstr?
*/
void ARM_Interpreter::SaveContext(ThreadContext& ctx) {
memcpy(ctx.cpu_registers, m_state->Reg, sizeof(ctx.cpu_registers));
memcpy(ctx.fpu_registers, m_state->ExtReg, sizeof(ctx.fpu_registers));
ctx.sp = m_state->Reg[13];
ctx.lr = m_state->Reg[14];
ctx.pc = m_state->pc;
ctx.cpsr = m_state->Cpsr;
ctx.fpscr = m_state->VFP[1];
ctx.fpexc = m_state->VFP[2];
}
/**
* Loads a CPU context
* @param ctx Thread context to load
* @param Do we need to load Reg[15] and NextInstr?
*/
void ARM_Interpreter::LoadContext(const ThreadContext& ctx) {
memcpy(m_state->Reg, ctx.cpu_registers, sizeof(ctx.cpu_registers));
memcpy(m_state->ExtReg, ctx.fpu_registers, sizeof(ctx.fpu_registers));
m_state->Reg[13] = ctx.sp;
m_state->Reg[14] = ctx.lr;
m_state->pc = ctx.pc;
m_state->Cpsr = ctx.cpsr;
m_state->VFP[1] = ctx.fpscr;
m_state->VFP[2] = ctx.fpexc;
}