paoda
/
zba
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

feat(cpu): implement ADC 

ADC interacting w/ the Barrel Shifter is not working though
This commit is contained in:
Rekai Nyangadzayi Musuka 2022-01-17 14:29:34 -04:00
parent 483e149b32
commit d4d2fedfbe
1 changed files with 16 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
src/cpu/arm/data_processing.zig
View File

@ -54,6 +54,22 @@ pub fn dataProcessing(comptime I: bool, comptime S: bool, comptime instrKind: u4
cpu.cpsr.v.write(((op1 ^ result) & (op2 ^ result)) >> 31 & 1 == 1);
}
},
0x5 => {
// ADC
const carry = @boolToInt(cpu.cpsr.c.read());
var result: u32 = undefined;
const did = @addWithOverflow(u32, op1, op2, &result);
const overflow = @addWithOverflow(u32, result, carry, &result);
cpu.r[rd] = result;
if (S and rd != 0xF) {
cpu.cpsr.n.write(result >> 31 & 1 == 1);
cpu.cpsr.z.write(result == 0);
cpu.cpsr.c.write(did or overflow);
cpu.cpsr.v.write(((op1 ^ result) & (op2 ^ result)) >> 31 & 1 == 1);
}
},
0x8 => {
// TST
const result = op1 & op2;