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// Copyright 2014 Citra Emulator Project
// Licensed under GPLv2
// Refer to the license.txt file included.
#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() {
state = new ARMul_State;
ARMul_EmulateInit();
memset(state, 0, sizeof(ARMul_State));
ARMul_NewState(state);
state->abort_model = 0;
state->cpu = (cpu_config_t*)&s_arm11_cpu_info;
state->bigendSig = LOW;
ARMul_SelectProcessor(state, ARM_v6_Prop | ARM_v5_Prop | ARM_v5e_Prop);
state->lateabtSig = LOW;
mmu_init(state);
// Reset the core to initial state
ARMul_CoProInit(state);
ARMul_Reset(state);
state->NextInstr = RESUME; // NOTE: This will be overwritten by LoadContext
state->Emulate = 3;
state->pc = state->Reg[15] = 0x00000000;
state->Reg[13] = 0x10000000; // Set stack pointer to the top of the stack
state->servaddr = 0xFFFF0000;
}
ARM_Interpreter::~ARM_Interpreter() {
delete state;
}
/**
* Set the Program Counter to an address
* @param addr Address to set PC to
*/
void ARM_Interpreter::SetPC(u32 pc) {
state->pc = state->Reg[15] = pc;
}
/*
* Get the current Program Counter
* @return Returns current PC
*/
u32 ARM_Interpreter::GetPC() const {
return 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 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) {
state->Reg[index] = value;
}
/**
* Get the current CPSR register
* @return Returns the value of the CPSR register
*/
u32 ARM_Interpreter::GetCPSR() const {
return state->Cpsr;
}
/**
* Set the current CPSR register
* @param cpsr Value to set CPSR to
*/
void ARM_Interpreter::SetCPSR(u32 cpsr) {
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(state);
}
/**
* Executes the given number of instructions
* @param num_instructions Number of instructions to executes
*/
void ARM_Interpreter::ExecuteInstructions(int num_instructions) {
state->NumInstrsToExecute = num_instructions - 1;
ARMul_Emulate32(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, state->Reg, sizeof(ctx.cpu_registers));
memcpy(ctx.fpu_registers, state->ExtReg, sizeof(ctx.fpu_registers));
ctx.sp = state->Reg[13];
ctx.lr = state->Reg[14];
ctx.pc = state->pc;
ctx.cpsr = state->Cpsr;
ctx.fpscr = state->VFP[1];
ctx.fpexc = state->VFP[2];
ctx.reg_15 = state->Reg[15];
ctx.mode = state->NextInstr;
}
/**
* 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(state->Reg, ctx.cpu_registers, sizeof(ctx.cpu_registers));
memcpy(state->ExtReg, ctx.fpu_registers, sizeof(ctx.fpu_registers));
state->Reg[13] = ctx.sp;
state->Reg[14] = ctx.lr;
state->pc = ctx.pc;
state->Cpsr = ctx.cpsr;
state->VFP[1] = ctx.fpscr;
state->VFP[2] = ctx.fpexc;
state->Reg[15] = ctx.reg_15;
state->NextInstr = ctx.mode;
}
/// Prepare core for thread reschedule (if needed to correctly handle state)
void ARM_Interpreter::PrepareReschedule() {
state->NumInstrsToExecute = 0;
}
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