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feat: implement basic pipeline

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passes arm.gba, thumb.gb and armwrestler, fails in actual games
TODO: run FuzzARM debug specific titles
This commit is contained in:
Rekai Nyangadzayi Musuka
2022-06-29 06:33:17 -03:00
parent 62162ba492
commit b3ada64e64
13 changed files with 158 additions and 99 deletions
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41
src/core/cpu/arm/data_processing.zig
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@@ -13,17 +13,12 @@ pub fn dataProcessing(comptime I: bool, comptime S: bool, comptime instrKind: u4
const old_carry = @boolToInt(cpu.cpsr.c.read());
// If certain conditions are met, PC is 12 ahead instead of 8
// TODO: What are these conditions? I can't remember
if (!I and opcode >> 4 & 1 == 1) cpu.r[15] += 4;
const op1 = cpu.r[rn];
const op1 = if (rn == 0xF) cpu.fakePC() else cpu.r[rn];
var op2: u32 = undefined;
if (I) {
const amount = @truncate(u8, (opcode >> 8 & 0xF) << 1);
op2 = rotateRight(S, &cpu.cpsr, opcode & 0xFF, amount);
} else {
op2 = execute(S, cpu, opcode);
}
const amount = @truncate(u8, (opcode >> 8 & 0xF) << 1);
const op2 = if (I) rotateRight(S, &cpu.cpsr, opcode & 0xFF, amount) else execute(S, cpu, opcode);
// Undo special condition from above
if (!I and opcode >> 4 & 1 == 1) cpu.r[15] -= 4;
@@ -67,39 +62,31 @@ pub fn dataProcessing(comptime I: bool, comptime S: bool, comptime instrKind: u4
},
0x8 => {
// TST
if (rd == 0xF) {
undefinedTestBehaviour(cpu);
return;
}
if (rd == 0xF)
return undefinedTestBehaviour(cpu);
const result = op1 & op2;
setTestOpFlags(S, cpu, opcode, result);
},
0x9 => {
// TEQ
if (rd == 0xF) {
undefinedTestBehaviour(cpu);
return;
}
if (rd == 0xF)
return undefinedTestBehaviour(cpu);
const result = op1 ^ op2;
setTestOpFlags(S, cpu, opcode, result);
},
0xA => {
// CMP
if (rd == 0xF) {
undefinedTestBehaviour(cpu);
return;
}
if (rd == 0xF)
return undefinedTestBehaviour(cpu);
cmp(cpu, op1, op2);
},
0xB => {
// CMN
if (rd == 0xF) {
undefinedTestBehaviour(cpu);
return;
}
if (rd == 0xF)
return undefinedTestBehaviour(cpu);
cmn(cpu, op1, op2);
},
@@ -127,6 +114,8 @@ pub fn dataProcessing(comptime I: bool, comptime S: bool, comptime instrKind: u4
setArmLogicOpFlags(S, cpu, rd, result);
},
}
if (rd == 0xF) cpu.pipe.flush();
}
}.inner;
}
@@ -280,5 +269,5 @@ fn setTestOpFlags(comptime S: bool, cpu: *Arm7tdmi, opcode: u32, result: u32) vo
fn undefinedTestBehaviour(cpu: *Arm7tdmi) void {
@setCold(true);
cpu.setCpsr(cpu.spsr.raw);
cpu.setCpsrNoFlush(cpu.spsr.raw);
}