1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
|
package cpu.opcodes
import cpu.Operation
import cpu.Registers
import cpu.Registers.Flag
import ram.Ram
import BitManipulation as bm
val calls = mapOf(
0xCD to Operation("CALL nn", 2, 12, {r, m, a -> call(bm.argsToWord(a), r, m)}),
0xC4 to Operation("CALL NZ,nn", 2, 12, {r, m, a -> if(r.getFlag(Flag.ZERO) == 0) call(bm.argsToWord(a), r, m)}),
0xCC to Operation("CALL Z,nn", 2, 12, {r, m, a -> if(r.getFlag(Flag.ZERO) == 1) call(bm.argsToWord(a), r, m)}),
0xD4 to Operation("CALL NC,nn", 2, 12, {r, m, a -> if(r.getFlag(Flag.CARRY) == 0) call(bm.argsToWord(a), r, m)}),
0xDC to Operation("CALL C,nn", 2, 12, {r, m, a -> if(r.getFlag(Flag.CARRY) == 1) call(bm.argsToWord(a), r, m)})
)
private fun call(word: Int, r: Registers, m: Ram) {
val nextAddress = (r.PC + 3) and 0xFFFF
m.writeByte(r.decrementAndGetSP(), bm.getMsb(nextAddress))
m.writeByte(r.decrementAndGetSP(), bm.getLsb(nextAddress))
r.PC = word
}
|