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/*
Nios-sim - one simple NIOSII simulator only for personal interest and fun.
Copyright (C) 2010 chysun2000@gmail.com
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <stdio.h>
#include "public.h"
#include "niosii.h"
#include "instruction.h"
static uint32_t ldbu(struct NIOS_CPU * cpu, uint32_t code)
{
def_i_type_code;
int32_t addr = 0;
addr = cpu->gp_regs[instr->a] + (int16_t)(instr->imm16);
cpu->gp_regs[instr->b] = get_byte(addr) & 0x000000FF;
return PC_INC_NORMAL;
}
static uint32_t addi(struct NIOS_CPU * cpu, uint32_t code)
{
def_i_type_code;
cpu->gp_regs[instr->b] = cpu->gp_regs[instr->a] + (int16_t)(instr->imm16);
return PC_INC_NORMAL;
}
static uint32_t stb(struct NIOS_CPU * cpu, uint32_t code)
{
def_i_type_code;
uint32_t addr = 0;
addr = cpu->gp_regs[instr->a] + (int16_t)(instr->imm16);
store_byte(addr, (cpu->gp_regs[instr->b] & 0xFF));
return PC_INC_NORMAL;
}
static uint32_t br(struct NIOS_CPU * cpu, uint32_t code)
{
def_i_type_code;
int16_t imm16 = (int16_t)instr->imm16;
cpu->pc = cpu->pc + 4 + (int16_t)(imm16 & 0xFFFC);
return PC_INC_BY_INSTR;
}
static uint32_t ldb(struct NIOS_CPU * cpu, uint32_t code)
{
def_i_type_code;
uint32_t addr = cpu->gp_regs[instr->a] + (int16_t)(instr->imm16);
cpu->gp_regs[instr->b] = (int)((char)(get_byte(addr)));
return PC_INC_NORMAL;
}
static uint32_t cmpgei(struct NIOS_CPU * cpu, uint32_t code)
{
def_i_type_code;
if ((int32_t)(cpu->gp_regs[instr->a]) >= (int32_t)((int16_t)(instr->imm16))){
cpu->gp_regs[instr->b] = 1;
}
else{
cpu->gp_regs[instr->b] = 0;
}
return PC_INC_NORMAL;
}
static uint32_t cmplti(struct NIOS_CPU * cpu, uint32_t code)
{
def_i_type_code;
if ((int32_t)(cpu->gp_regs[instr->a]) < (int32_t)((int16_t)(instr->imm16))){
cpu->gp_regs[instr->b] = 1;
}
else{
cpu->gp_regs[instr->b] = 0;
}
return PC_INC_NORMAL;
}
static uint32_t ldhu(struct NIOS_CPU * cpu, uint32_t code)
{
def_i_type_code;
int16_t offset = (int16_t) instr->imm16;
int16_t value = 0;
value = get_half_word((int16_t)offset + cpu->gp_regs[instr->a]);
cpu->gp_regs[instr->b] = ((uint32_t)value) & 0xFFFF;
return PC_INC_NORMAL;
}
static uint32_t andi(struct NIOS_CPU * cpu, uint32_t code)
{
def_i_type_code;
uint32_t temp = instr->imm16;
temp = temp & 0xFFFF;
cpu->gp_regs[instr->b] = cpu->gp_regs[instr->a] & temp;
return PC_INC_NORMAL;
}
static uint32_t sth(struct NIOS_CPU * cpu, uint32_t code)
{
def_i_type_code;
int16_t offset = (int16_t)instr->imm16;
uint32_t addr = 0;
addr = cpu->gp_regs[instr->a] + (int16_t)offset;
store_half_word(addr, (uint16_t)(cpu->gp_regs[instr->b] & 0xFFFF));
return PC_INC_NORMAL;
}
static uint32_t bge(struct NIOS_CPU * cpu, uint32_t code)
{
def_i_type_code;
int32_t a = (int32_t)(cpu->gp_regs[instr->a]);
int32_t b = (int32_t)(cpu->gp_regs[instr->b]);
if (a >= b){
cpu->pc = cpu->pc + 4 + (int16_t)((int16_t)instr->imm16 & 0xFFFC);
}
else{
cpu->pc = cpu->pc + 4;
}
return PC_INC_BY_INSTR;
}
static uint32_t ldh(struct NIOS_CPU * cpu, uint32_t code)
{
def_i_type_code;
int16_t value = 0;
value = (int16_t)get_half_word(cpu->gp_regs[instr->a] + (int16_t)(instr->imm16));
cpu->gp_regs[instr->b] = (int32_t)value;
return PC_INC_NORMAL;
}
static uint32_t initda(struct NIOS_CPU * cpu, uint32_t code)
{
#if 0
def_i_type_code;
#endif
return PC_INC_NORMAL;
}
static uint32_t ori(struct NIOS_CPU * cpu, uint32_t code)
{
def_i_type_code;
int32_t temp = (int16_t)instr->imm16;
temp = temp & 0xFFFF;
cpu->gp_regs[instr->b] = cpu->gp_regs[instr->a] | temp;
return PC_INC_NORMAL;
}
static uint32_t stw(struct NIOS_CPU * cpu, uint32_t code)
{
def_i_type_code;
int16_t offset = (int16_t)(instr->imm16);
store_word(cpu->gp_regs[instr->a] + (int16_t)offset, cpu->gp_regs[instr->b]);
return PC_INC_NORMAL;
}
static uint32_t blt(struct NIOS_CPU * cpu, uint32_t code)
{
def_i_type_code;
int32_t a = (int32_t)(cpu->gp_regs[instr->a]);
int32_t b = (int32_t)(cpu->gp_regs[instr->b]);
int16_t imm16 = (int16_t)(instr->imm16);
if (a < b){
cpu->pc = cpu->pc + 4 + (int16_t)(imm16 & 0xFFFC);
}
else{
cpu->pc = cpu->pc + 4;
}
return PC_INC_BY_INSTR;
}
static uint32_t ldw(struct NIOS_CPU * cpu, uint32_t code)
{
def_i_type_code;
int16_t offset = (int16_t)(instr->imm16);
cpu->gp_regs[instr->b] = get_word(cpu->gp_regs[instr->a] + (int16_t)offset);
return PC_INC_NORMAL;
}
static uint32_t cmpnei(struct NIOS_CPU * cpu, uint32_t code)
{
def_i_type_code;
int16_t value = (int16_t)(instr->imm16);
if (cpu->gp_regs[instr->a] != (int16_t)value){
cpu->gp_regs[instr->b] = 1;
}
else{
cpu->gp_regs[instr->b] = 0;
}
return PC_INC_NORMAL;
}
static uint32_t flushda(struct NIOS_CPU * cpu, uint32_t code)
{
#if 0
def_i_type_code;
#endif
return PC_INC_NORMAL;
}
static uint32_t xori(struct NIOS_CPU * cpu, uint32_t code)
{
def_i_type_code;
uint32_t value = 0;
value = (uint16_t)instr->imm16;
value &= 0xFFFF;
cpu->gp_regs[instr->b] = cpu->gp_regs[instr->a] ^ value;
return PC_INC_NORMAL;
}
static uint32_t bne(struct NIOS_CPU * cpu, uint32_t code)
{
def_i_type_code;
if (cpu->gp_regs[instr->a] != cpu->gp_regs[instr->b]){
cpu->pc = cpu->pc + 4 + (int16_t)((int16_t)instr->imm16 & 0xFFFC);
}
else {
cpu->pc = cpu->pc + 4;
}
return PC_INC_BY_INSTR;
}
static uint32_t cmpeqi(struct NIOS_CPU * cpu, uint32_t code)
{
def_i_type_code;
if(cpu->gp_regs[instr->a] == (int32_t)(instr->imm16)){
cpu->gp_regs[instr->b] = 1;
}
else{
cpu->gp_regs[instr->b] = 0;
}
return PC_INC_NORMAL;
}
static uint32_t ldbuio(struct NIOS_CPU * cpu, uint32_t code)
{
return ldbu(cpu, code);
}
static uint32_t muli(struct NIOS_CPU * cpu, uint32_t code)
{
def_i_type_code;
unsigned long long data = 0;
uint32_t a = cpu->gp_regs[instr->a];
int32_t b = (int32_t)((int16_t)instr->imm16);
data = (a * b);
cpu->gp_regs[instr->b] = (uint32_t)(data & 0xFFFFFFFF);
return PC_INC_NORMAL;
}
static uint32_t stbio(struct NIOS_CPU * cpu, uint32_t code)
{
def_i_type_code;
uint32_t addr = cpu->gp_regs[instr->a] + (int16_t)(instr->imm16);
store_byte(addr, (uint8_t)(cpu->gp_regs[instr->b] & 0xFF));
return PC_INC_NORMAL;
}
static uint32_t beq(struct NIOS_CPU * cpu, uint32_t code)
{
def_i_type_code;
int16_t temp = (int16_t)instr->imm16;
if (cpu->gp_regs[instr->a] == cpu->gp_regs[instr->b]){
cpu->pc = cpu->pc + 4 + (int16_t)(temp & 0xFFFC);
}
else{
cpu->pc = cpu->pc + 4;
}
return PC_INC_BY_INSTR;
}
static uint32_t ldbio(struct NIOS_CPU * cpu, uint32_t code)
{
return ldb(cpu, code);
}
static uint32_t cmpgeui(struct NIOS_CPU * cpu, uint32_t code)
{
def_i_type_code;
uint32_t value = 0;
value = (uint32_t)(((uint16_t)(instr->imm16)) & 0xFFFF);
if ((uint32_t)(cpu->gp_regs[instr->a]) >= value){
cpu->gp_regs[instr->b] = 1;
}
else{
cpu->gp_regs[instr->b] = 0;
}
return PC_INC_NORMAL;
}
static uint32_t ldhuio(struct NIOS_CPU * cpu, uint32_t code)
{
return ldhu(cpu, code);
}
static uint32_t andhi(struct NIOS_CPU * cpu, uint32_t code)
{
def_i_type_code;
int32_t value = 0;
int32_t temp = (int32_t)(instr->imm16);
value = temp << 16;
value = value & 0xFFFF0000;
cpu->gp_regs[instr->b] = cpu->gp_regs[instr->a] & value;
return PC_INC_NORMAL;
}
static uint32_t sthio(struct NIOS_CPU * cpu, uint32_t code)
{
return sth(cpu, code);
}
static uint32_t bgeu(struct NIOS_CPU * cpu, uint32_t code)
{
def_i_type_code;
if (cpu->gp_regs[instr->a] >= cpu->gp_regs[instr->b]){
cpu->pc = cpu->pc + 4 + (int16_t)((int16_t)(instr->imm16) & 0xFFFC);
}
else{
cpu->pc = cpu->pc + 4;
}
return PC_INC_BY_INSTR;
}
static uint32_t ldhio(struct NIOS_CPU * cpu, uint32_t code)
{
return ldh(cpu, code);
}
static uint32_t cmpltui(struct NIOS_CPU * cpu, uint32_t code)
{
def_i_type_code;
if (cpu->gp_regs[instr->a] < ((uint32_t)((uint16_t)instr->imm16) & 0xFFFF)){
cpu->gp_regs[instr->b] = 1;
}
else{
cpu->gp_regs[instr->b] = 0;
}
return PC_INC_NORMAL;
}
static uint32_t custom(struct NIOS_CPU * cpu, uint32_t code)
{
return custom_instr(cpu, code);
}
static uint32_t initd(struct NIOS_CPU * cpu, uint32_t code)
{
return PC_INC_NORMAL;
}
static uint32_t orhi(struct NIOS_CPU * cpu, uint32_t code)
{
def_i_type_code;
cpu->gp_regs[instr->b] = cpu->gp_regs[instr->a] | (((uint32_t)((uint16_t)instr->imm16) << 16) & 0xFFFF0000);
return PC_INC_NORMAL;
}
static uint32_t stwio(struct NIOS_CPU * cpu, uint32_t code)
{
return stw(cpu, code);
}
static uint32_t bltu(struct NIOS_CPU * cpu, uint32_t code)
{
def_i_type_code;
if (cpu->gp_regs[instr->a] < cpu->gp_regs[instr->b]){
cpu->pc = cpu->pc + 4 + (int16_t)((int16_t)instr->imm16 & 0xFFFC);
}
else{
cpu->pc = cpu->pc + 4;
}
return PC_INC_BY_INSTR;
}
static uint32_t ldwio(struct NIOS_CPU * cpu, uint32_t code)
{
return ldw(cpu, code);
}
static uint32_t rdprs(struct NIOS_CPU * cpu, uint32_t code)
{
return PC_INC_NORMAL;
}
static uint32_t flushd(struct NIOS_CPU * cpu, uint32_t code)
{
return PC_INC_NORMAL;
}
static uint32_t xorhi(struct NIOS_CPU * cpu, uint32_t code)
{
def_i_type_code;
uint32_t value = (uint16_t)(instr->imm16);
value = value << 16;
value = value & 0xFFFF0000;
cpu->gp_regs[instr->b] = cpu->gp_regs[instr->a] ^ value;
return PC_INC_NORMAL;
}
/*----------------------------------------------------------------------------*/
#define I_TYPE_HANDLER_COUNT (0x40)
struct i_type_handler i_type_handlers[I_TYPE_HANDLER_COUNT] = {
[LDBU] = handler_item(ldbu),
[ADDI] = handler_item(addi),
[STB] = handler_item(stb),
[BR] = handler_item(br),
[LDB] = handler_item(ldb),
[CMPGEI] = handler_item(cmpgei),
[LDHU] = handler_item(ldhu),
[ANDI] = handler_item(andi),
[STH] = handler_item(sth),
[BGE] = handler_item(bge),
[LDH] = handler_item(ldh),
[CMPLTI] = handler_item(cmplti),
[INITDA] = handler_item(initda),
[ORI] = handler_item(ori),
[STW] = handler_item(stw),
[BLT] = handler_item(blt),
[LDW] = handler_item(ldw),
[CMPNEI] = handler_item(cmpnei),
[FLUSHDA] = handler_item(flushda),
[XORI] = handler_item(xori),
[BNE] = handler_item(bne),
[CMPEQI] = handler_item(cmpeqi),
[LDBUIO] = handler_item(ldbuio),
[MULI] = handler_item(muli),
[STBIO] = handler_item(stbio),
[BEQ] = handler_item(beq),
[LDBIO] = handler_item(ldbio),
[CMPGEUI] = handler_item(cmpgeui),
[LDHUIO] = handler_item(ldhuio),
[ANDHI] = handler_item(andhi),
[STHIO] = handler_item(sthio),
[BGEU] = handler_item(bgeu),
[LDHIO] = handler_item(ldhio),
[CMPLTUI] = handler_item(cmpltui),
[CUSTOM] = handler_item(custom),
[INITD] = handler_item(initd),
[ORHI] = handler_item(orhi),
[STWIO] = handler_item(stwio),
[BLTU] = handler_item(bltu),
[LDWIO] = handler_item(ldwio),
[RDPRS] = handler_item(rdprs),
[FLUSHD] = handler_item(flushd),
[XORHI] = handler_item(xorhi)
};
/*----------------------------------------------------------------------------*/
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