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arm.cpp
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arm.cpp
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/*
* ARM9 emulator - Processor emulator
*
* Copyright (C) 2011 - Miguel Boton (Waninkoko)
* Copyright (C) 2010 - crediar, megazig
*
* 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 3 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, see <http://www.gnu.org/licenses/>.
*/
#include <iostream>
#include <cstdio>
#include <cstring>
#include "arm.hpp"
#include "endian.h"
#include "memory.hpp"
/* Shift/Rotate macros */
#define LSL(x,y) (x << y)
#define LSR(x,y) (x >> y)
#define ASR(x,y) ((x & (1 << 31)) ? ((x >> y) | ((~0 >> (32 - y)) << (32 - y))) : (x >> y))
#define ROR(x,y) ((x >> y) | (x << (32 - y)))
ARM::ARM(void)
{
/* Set pointers */
sp = (u32 *)(r + 13);
lr = (u32 *)(r + 14);
pc = (u32 *)(r + 15);
/* Reset */
Reset();
}
bool ARM::CondCheck(u32 opcode)
{
/* Check condition */
switch(opcode >> 28) {
case EQ:
return cpsr.z;
case NE:
return !cpsr.z;
case CS:
return cpsr.c;
case CC:
return !cpsr.c;
case MI:
return cpsr.n;
case PL:
return !cpsr.n;
case VS:
return cpsr.v;
case VC:
return !cpsr.v;
case HI:
return (cpsr.c && !cpsr.z);
case LS:
return (!cpsr.c || cpsr.z);
case GE:
return (cpsr.n == cpsr.v);
case LT:
return (cpsr.n != cpsr.v);
case GT:
return (cpsr.n == cpsr.v && !cpsr.z);
case LE:
return (cpsr.n != cpsr.v || cpsr.z);
case AL:
return true;
}
return false;
}
bool ARM::CondCheck(u16 opcode)
{
/* Check condition */
switch((opcode >> 8) & 0xF) {
case EQ:
return cpsr.z;
case NE:
return !cpsr.z;
case CS:
return cpsr.c;
case CC:
return !cpsr.c;
case MI:
return cpsr.n;
case PL:
return !cpsr.n;
case VS:
return cpsr.v;
case VC:
return !cpsr.v;
case HI:
return (cpsr.c && !cpsr.z);
case LS:
return (!cpsr.c || cpsr.z);
case GE:
return (cpsr.n == cpsr.v);
case LT:
return (cpsr.n != cpsr.v);
case GT:
return (cpsr.n == cpsr.v && !cpsr.z);
case LE:
return (cpsr.n != cpsr.v || cpsr.z);
case AL:
return true;
}
return false;
}
void ARM::CondPrint(u32 opcode)
{
/* Check condition */
switch (opcode >> 28) {
case EQ:
printf("eq"); break;
case NE:
printf("ne"); break;
case CS:
printf("cs"); break;
case CC:
printf("cc"); break;
case MI:
printf("mi"); break;
case PL:
printf("pl"); break;
case VS:
printf("vs"); break;
case VC:
printf("vc"); break;
case HI:
printf("hi"); break;
case LS:
printf("ls"); break;
case GE:
printf("ge"); break;
case LT:
printf("lt"); break;
case GT:
printf("gt"); break;
case LE:
printf("le"); break;
}
}
void ARM::CondPrint(u16 opcode)
{
/* Check condition */
switch ((opcode >> 8) & 0xF) {
case EQ:
printf("eq"); break;
case NE:
printf("ne"); break;
case CS:
printf("cs"); break;
case CC:
printf("cc"); break;
case MI:
printf("mi"); break;
case PL:
printf("pl"); break;
case VS:
printf("vs"); break;
case VC:
printf("vc"); break;
case HI:
printf("hi"); break;
case LS:
printf("ls"); break;
case GE:
printf("ge"); break;
case LT:
printf("lt"); break;
case GT:
printf("gt"); break;
case LE:
printf("le"); break;
}
}
void ARM::SuffPrint(u32 opcode)
{
if ((opcode >> 20) & 1)
printf("s");
}
void ARM::ShiftPrint(u32 opcode)
{
u32 amt = (opcode >> 7) & 0x1F;
if (!amt)
return;
switch ((opcode >> 5) & 3) {
case 0:
printf(",LSL#%d", amt);
break;
case 1:
printf(",LSR#%d", amt);
break;
case 2:
printf(",ASR#%d", amt);
break;
case 3:
printf(",ROR#%d", amt);
break;
}
}
bool ARM::CarryFrom(u32 a, u32 b)
{
return ((a + b) < a) ? true : false;
}
bool ARM::BorrowFrom(u32 a, u32 b)
{
return (a < b) ? true : false;
}
bool ARM::OverflowFrom(u32 a, u32 b)
{
u32 s = a + b;
if((a & (1 << 31)) == (b & (1 << 31)) &&
(s & (1 << 31)) != (a & (1 << 31)))
return true;
return false;
}
u32 ARM::Addition(u32 a, u32 b)
{
u32 result;
/* Add values */
result = a + b;
/* Set flags */
cpsr.c = CarryFrom(a, b);
cpsr.v = OverflowFrom(a, b);
cpsr.z = result == 0;
cpsr.n = result >> 31;
return result;
}
u32 ARM::Substract(u32 a, u32 b)
{
u32 result;
/* Substract values */
result = a - b;
/* Set flags */
cpsr.c = !BorrowFrom(a, b);
cpsr.v = OverflowFrom(a, -b);
cpsr.z = result == 0;
cpsr.n = result >> 31;
return result;
}
u32 ARM::Shift(u32 opcode, u32 value)
{
bool S = (opcode >> 20) & 1;
u32 amt = (opcode >> 7) & 0x1F;
u32 result;
if (!amt)
return value;
switch ((opcode >> 5) & 3) {
case 0:
if (S) cpsr.c = value & (1 << (32 - amt));
result = LSL(value, amt);
break;
case 1:
if (S) cpsr.c = value & (1 << (amt - 1));
result = LSR(value, amt);
break;
case 2:
if (S) cpsr.c = value & (1 << (amt - 1));
result = ASR(value, amt);
break;
case 3:
result = ROR(value, amt);
break;
default:
result = value;
}
return result;
}
void ARM::Push(u32 value)
{
/* Update SP */
*sp -= sizeof(u32);
/* Write value */
Memory::Write32(*sp, value);
}
u32 ARM::Pop(void)
{
u32 addr = *sp;
/* Update SP */
*sp += sizeof(u32);
/* Read value */
return Memory::Read32(addr);
}
void ARM::Parse(void)
{
u32 opcode;
printf("%08X [A] ", *pc);
/* Read opcode */
opcode = Memory::Read32(*pc);
/* Update PC */
*pc += sizeof(opcode);
/* Registers */
u32 Rn = ((opcode >> 16) & 0xF);
u32 Rd = ((opcode >> 12) & 0xF);
u32 Rm = ((opcode >> 0) & 0xF);
u32 Rs = ((opcode >> 8) & 0xF);
u32 Imm = ((opcode >> 0) & 0xFF);
u32 amt = Rs << 1;
/* Flags */
bool I = (opcode >> 25) & 1;
bool P = (opcode >> 24) & 1;
bool U = (opcode >> 23) & 1;
bool B = (opcode >> 22) & 1;
bool W = (opcode >> 21) & 1;
bool S = (opcode >> 20) & 1;
bool L = (opcode >> 20) & 1;
if (((opcode >> 8) & 0xFFFFF) == 0x12FFF) {
bool link = (opcode >> 5) & 1;
printf("b%sx", (link) ? "l" : "");
CondPrint(opcode);
printf(" r%d\n", Rm);
if (!CondCheck(opcode))
return;
if (link) *lr = *pc;
cpsr.t = r[Rm] & 1;
*pc = r[Rm] & ~1;
return;
}
if ((opcode >> 24) == 0xEF) {
u32 Imm = opcode & 0xFFFFFF;
printf("swi 0x%X\n", Imm);
ParseSvc(Imm & 0xFF);
return;
}
if (((opcode >> 22) & 0x3F) == 0 &&
((opcode >> 4) & 0x0F) == 9) {
printf("%s", (W) ? "mla" : "mul");
CondPrint(opcode);
SuffPrint(opcode);
printf(" r%d, r%d, r%d", Rn, Rm, Rs);
if (W)
printf(", r%d", Rd);
printf("\n");
if (!CondCheck(opcode))
return;
if (W)
r[Rn] = (r[Rm] * r[Rs] + r[Rd]) & 0xFFFFFFFF;
else
r[Rn] = (r[Rm] * r[Rs]) & 0xFFFFFFFF;
if (S) {
cpsr.z = r[Rn] == 0;
cpsr.n = r[Rn] >> 31;
}
return;
}
switch ((opcode >> 26) & 0x3) {
case 0: {
switch ((opcode >> 21) & 0xF) {
case 0: { // AND
printf("and");
CondPrint(opcode);
SuffPrint(opcode);
if (!I) {
printf(" r%d, r%d, r%d", Rd, Rn, Rm);
ShiftPrint(opcode);
} else
printf(" r%d, r%d, #0x%X", Rd, Rn, ROR(Imm, amt));
printf("\n");
if (!CondCheck(opcode))
return;
if (I)
r[Rd] = r[Rn] & ROR(Imm, amt);
else
r[Rd] = r[Rn] & Shift(opcode, r[Rm]);
if (S) {
cpsr.z = r[Rd] == 0;
cpsr.n = r[Rd] >> 31;
}
return;
}
case 1: { // EOR
printf("eor");
CondPrint(opcode);
SuffPrint(opcode);
if (!I) {
printf(" r%d, r%d, r%d", Rd, Rn, Rm);
ShiftPrint(opcode);
} else
printf(" r%d, r%d, #0x%X", Rd, Rn, ROR(Imm, amt));
printf("\n");
if (!CondCheck(opcode))
return;
if (I)
r[Rd] = r[Rn] ^ ROR(Imm, amt);
else
r[Rd] = r[Rn] ^ Shift(opcode, r[Rm]);
if (S) {
cpsr.z = r[Rd] == 0;
cpsr.n = r[Rd] >> 31;
}
return;
}
case 2: { // SUB
printf("sub");
CondPrint(opcode);
SuffPrint(opcode);
if (!I) {
printf(" r%d, r%d, r%d", Rd, Rn, Rm);
ShiftPrint(opcode);
} else
printf(" r%d, r%d, #0x%X", Rd, Rn, ROR(Imm, amt));
printf("\n");
if (!CondCheck(opcode))
return;
if (I)
r[Rd] = r[Rn] - ROR(Imm, amt);
else
r[Rd] = r[Rn] - Shift(opcode, r[Rm]);
if (S) {
cpsr.c = (I) ? (r[Rn] >= ROR(Imm, amt)) : (r[Rn] < r[Rd]);
cpsr.v = (I) ? ((r[Rn] >> 31) & ~(r[Rd] >> 31)) : ((r[Rn] >> 31) & ~(r[Rd] >> 31));
cpsr.z = r[Rd] == 0;
cpsr.n = r[Rd] >> 31;
}
return;
}
case 3: { // RSB
printf("rsb");
CondPrint(opcode);
SuffPrint(opcode);
if (!I) {
printf(" r%d, r%d, r%d", Rd, Rn, Rm);
ShiftPrint(opcode);
} else
printf(" r%d, r%d, #0x%X", Rd, Rn, ROR(Imm, amt));
printf("\n");
if (!CondCheck(opcode))
return;
if (I)
r[Rd] = ROR(Imm, amt) - r[Rn];
else
r[Rd] = Shift(opcode, r[Rm]) - r[Rn];
if (S) {
cpsr.c = (I) ? (r[Rn] > Imm) : (r[Rn] > r[Rm]);
cpsr.v = (I) ? ((Imm >> 31) & ~((Imm - r[Rn]) >> 31)) : ((Imm >> 31) & ~((r[Rm] - r[Rn]) >> 31));
cpsr.z = r[Rd] == 0;
cpsr.n = r[Rd] >> 31;
}
return;
}
case 4: { // ADD
printf("add");
CondPrint(opcode);
SuffPrint(opcode);
if (!I) {
printf(" r%d, r%d, r%d", Rd, Rn, Rm);
ShiftPrint(opcode);
} else
printf(" r%d, r%d, #0x%X", Rd, Rn, ROR(Imm, amt));
printf("\n");
if (!CondCheck(opcode))
return;
if (I)
r[Rd] = r[Rn] + ROR(Imm, amt);
else
r[Rd] = r[Rn] + Shift(opcode, r[Rm]);
if (Rn == 15)
r[Rd] += 4;
if (S) {
cpsr.c = r[Rd] < r[Rn];
cpsr.v = (r[Rn] >> 31) & ~(r[Rd] >> 31);
cpsr.z = r[Rd] == 0;
cpsr.n = r[Rd] >> 31;
}
return;
}
case 5: { // ADC
printf("adc");
CondPrint(opcode);
SuffPrint(opcode);
if (!I) {
printf(" r%d, r%d, r%d", Rd, Rn, Rm);
ShiftPrint(opcode);
} else
printf(" r%d, r%d, #0x%X", Rd, Rn, ROR(Imm, amt));
printf("\n");
if (!CondCheck(opcode))
return;
if (I)
r[Rd] = r[Rn] + ROR(Imm, amt) + cpsr.c;
else
r[Rd] = r[Rn] + Shift(opcode, r[Rm]) + cpsr.c;
if (S) {
cpsr.z = r[Rd] == 0;
cpsr.n = r[Rd] >> 31;
}
return;
}
case 6: { // SBC
printf("sbc");
CondPrint(opcode);
SuffPrint(opcode);
if (!I) {
printf(" r%d, r%d, r%d", Rd, Rn, Rm);
ShiftPrint(opcode);
} else
printf(" r%d, r%d, #0x%X", Rd, Rn, ROR(Imm, amt));
printf("\n");
if (!CondCheck(opcode))
return;
if (I)
r[Rd] = r[Rn] - ROR(Imm, amt) - !cpsr.c;
else
r[Rd] = r[Rn] - Shift(opcode, r[Rm]) - !cpsr.c;
if (S) {
cpsr.c = r[Rd] > r[Rn];
cpsr.v = (r[Rn] >> 31) & ~(r[Rd] >> 31);
cpsr.z = r[Rd] == 0;
cpsr.n = r[Rd] >> 31;
}
return;
}
case 7: { // RSC
printf("rsc");
CondPrint(opcode);
SuffPrint(opcode);
if (!I) {
printf(" r%d, r%d, r%d", Rd, Rn, Rm);
ShiftPrint(opcode);
} else
printf(" r%d, r%d, #0x%X", Rd, Rn, ROR(Imm, amt));
printf("\n");
if (!CondCheck(opcode))
return;
if (I)
r[Rd] = ROR(Imm, amt) - r[Rn] - !cpsr.c;
else
r[Rd] = Shift(opcode, r[Rm]) - r[Rn] - !cpsr.c;
if (S) {
cpsr.c = (I) ? (r[Rd] > Imm) : (r[Rd] > r[Rm]);
cpsr.v = (I) ? ((r[Rm] >> 31) & ~(r[Rd] >> 31)) : ((r[Rn] >> 31) & ~(r[Rd] >> 31));
cpsr.z = r[Rd] == 0;
cpsr.n = r[Rd] >> 31;
}
return;
}
case 8: { // TST/MRS
if (S) {
u32 result;
printf("tst");
CondPrint(opcode);
if (!I) {
printf(" r%d, r%d\n", Rn, Rm);
ShiftPrint(opcode);
result = r[Rn] & Shift(opcode, r[Rm]);
} else {
printf(" r%d, #0x%X\n", Rn, ROR(Imm, amt));
result = r[Rn] & ROR(Imm, amt);
}
cpsr.z = result == 0;
cpsr.n = result >> 31;
} else {
printf("mrs r%d, cpsr\n", Rd);
r[Rd] = cpsr.value;
}
return;
}
case 9: { // TEQ/MSR
if (S) {
u32 result;
printf("teq");
CondPrint(opcode);
if (!I) {
printf(" r%d, r%d\n", Rn, Rm);
ShiftPrint(opcode);
result = r[Rn] ^ Shift(opcode, r[Rm]);
} else {
printf(" r%d, #0x%X\n", Rn, ROR(Imm, amt));
result = r[Rn] ^ ROR(Imm, amt);
}
cpsr.z = result == 0;
cpsr.n = result >> 31;
} else {
if (I) {
printf("msr cpsr, r%d\n", Rm);
cpsr.value = r[Rm];
} else {
printf("msr cpsr, 0x%08X\n", Imm);
cpsr.value = Imm;
}
}
return;
}
case 10: { // CMP/MRS2
if (S) {
u32 value;
printf("cmp");
CondPrint(opcode);
if (I) {
value = ROR(Imm, amt);
printf(" r%d, 0x%08X\n", Rn, value);
} else {
value = r[Rm];
printf(" r%d, r%d\n", Rn, Rm);
}
if (CondCheck(opcode))
Substract(r[Rn], value);
} else
printf("mrs2\n");
return;
}
case 11: { // CMN/MSR2
if (S) {
u32 value;
printf("cmn");
CondPrint(opcode);
if (I) {
value = ROR(Imm, amt);
printf(" r%d, 0x%08X\n", Rn, value);
} else {
value = r[Rm];
printf(" r%d, r%d\n", Rn, Rm);
}
if (CondCheck(opcode))
Addition(r[Rn], value);
} else
printf("msr2\n");
return;
}
case 12: { // ORR
printf("orr");
CondPrint(opcode);
SuffPrint(opcode);
if (!I) {
printf(" r%d, r%d, r%d", Rd, Rn, Rm);
ShiftPrint(opcode);
} else
printf(" r%d, r%d, #0x%X", Rd, Rn, ROR(Imm, amt));
printf("\n");
if (!CondCheck(opcode))
return;
if (I)
r[Rd] = r[Rn] | ROR(Imm, amt);
else
r[Rd] = r[Rn] | Shift(opcode, r[Rm]);
if (S) {
cpsr.z = r[Rd] == 0;
cpsr.n = r[Rd] >> 31;
}
return;
}
case 13: { // MOV
printf("mov");
CondPrint(opcode);
SuffPrint(opcode);
if (!I) {
printf(" r%d, r%d", Rd, Rm);
ShiftPrint(opcode);
} else
printf(" r%d, #0x%X", Rd, ROR(Imm, amt));
printf("\n");
if (!CondCheck(opcode))
return;
if (I)
r[Rd] = ROR(Imm, amt);
else
r[Rd] = (Rm == 15) ? (*pc + sizeof(opcode)) : Shift(opcode, r[Rm]);
if (S) {
cpsr.z = r[Rd] == 0;
cpsr.n = r[Rd] >> 31;
}
return;
}
case 14: { // BIC
printf("bic");
CondPrint(opcode);
SuffPrint(opcode);
if (!I) {
printf(" r%d, r%d, r%d", Rd, Rn, Rm);
ShiftPrint(opcode);
} else
printf(" r%d, r%d, #0x%X", Rd, Rn, ROR(Imm, amt));
printf("\n");
if (!CondCheck(opcode))
return;
if (I)
r[Rd] = r[Rn] & ~(ROR(Imm, amt));
else
r[Rd] = r[Rd] & ~Shift(opcode, r[Rm]);
if (S) {
cpsr.z = r[Rd] == 0;
cpsr.n = r[Rd] >> 31;
}
return;
}
case 15: { // MVN
printf("mvn");
CondPrint(opcode);
SuffPrint(opcode);
if (!I) {
printf(" r%d, r%d", Rd, Rm);
ShiftPrint(opcode);
} else
printf(" r%d, #0x%X", Rd, ROR(Imm, amt));
printf("\n");
if (!CondCheck(opcode))
return;
if (I)
r[Rd] = ~ROR(Imm, amt);
else
r[Rd] = ~Shift(opcode, r[Rm]);
if (S) {
cpsr.z = r[Rd] == 0;
cpsr.n = r[Rd] >> 31;
}
return;
}
}
}
case 1: { // LDR/STR
u32 addr, value, wb;
printf("%s%s", (L) ? "ldr" : "str", (B) ? "b" : "");
CondPrint(opcode);
printf(" r%d,", Rd);
Imm = opcode & 0xFFF;
if (L && Rn == 15) {
addr = *pc + Imm + sizeof(opcode);
value = Memory::Read32(addr);
if (CondCheck(opcode))
r[Rd] = value;
printf(" =0x%X\n", value);
return;
}
printf(" [r%d", Rn);
if (I) {
value = Shift(opcode, r[Rm]);
printf(", %sr%d", (U) ? "" : "-", Rm);
ShiftPrint(opcode);
} else {
value = Imm;
printf(", #%s0x%X", (U) ? "" : "-", value);
}
printf("]%s\n", (W) ? "!" : "");
if (!CondCheck(opcode))
return;
if (U) wb = r[Rn] + value;
else wb = r[Rn] - value;
addr = (P) ? wb : r[Rn];
if (L) {
if (B)
r[Rd] = Memory::Read8 (addr);
else
r[Rd] = Memory::Read32(addr);
} else {
value = r[Rd];
if (Rd == 15)
value += 8;
if (B)
Memory::Write8 (addr, value);
else
Memory::Write32(addr, value);
}
if (W || !P) r[Rn] = wb;
return;
}
default:
break;
}
switch ((opcode >> 25) & 7) {
case 4: { // LDM/STM
u32 start = r[Rn];
bool pf = false;
if (L) {
printf("ldm");
if (Rn == 13)
printf("%c%c", (P) ? 'e' : 'f', (U) ? 'd' : 'a');
else
printf("%c%c", (U) ? 'i' : 'd', (P) ? 'b' : 'a');
} else {
printf("stm");
if (Rn == 13)
printf("%c%c", (P) ? 'f' : 'e', (U) ? 'a' : 'd');
else
printf("%c%c", (U) ? 'i' : 'd', (P) ? 'b' : 'a');
}
if (Rn == 13)
printf(" sp");
else
printf(" r%d", Rn);
if (W) printf("!");
printf(", {");
for (s32 i = 0; i < 16; i++) {
if ((opcode >> i) & 1) {
if (pf) printf(", ");
printf("r%d", i);
pf = true;
}
}
printf("}");
if (B) {
printf("^");
if (opcode & (1 << 15))
cpsr.value = spsr;
}
printf("\n");
if (L) {
for (s32 i = 0; i < 16; i++) {
if ((opcode >> i) & 1) {
if (P) start += (U) ? sizeof(u32) : -sizeof(u32);