From 3c79491491f9b6676ce28d53dd8bf52cced40540 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jo=C3=A3o=20Magalh=C3=A3es?= <joamag@gmail.com>
Date: Sat, 2 Jul 2022 23:37:23 +0100
Subject: [PATCH] feat: more new instructions
---
src/inst.rs | 18 ++++++++++++++++--
1 file changed, 16 insertions(+), 2 deletions(-)
diff --git a/src/inst.rs b/src/inst.rs
index 9d9353e6..11592281 100644
--- a/src/inst.rs
+++ b/src/inst.rs
@@ -196,7 +196,7 @@ pub const INSTRUCTIONS: [(fn(&mut Cpu), u8, &'static str); 256] = [
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
- (noimpl, 4, "! UNIMP !"),
+ (or_a_a, 4, "OR A, A"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
@@ -229,7 +229,7 @@ pub const INSTRUCTIONS: [(fn(&mut Cpu), u8, &'static str); 256] = [
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
- (noimpl, 4, "! UNIMP !"),
+ (sub_a_u8, 8, "SUB A, u8"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
@@ -868,6 +868,15 @@ fn or_a_c(cpu: &mut Cpu) {
cpu.set_carry(false);
}
+fn or_a_a(cpu: &mut Cpu) {
+ cpu.a |= cpu.a;
+
+ cpu.set_sub(false);
+ cpu.set_zero(cpu.a == 0);
+ cpu.set_half_carry(false);
+ cpu.set_carry(false);
+}
+
fn cp_a_mhl(cpu: &mut Cpu) {
let byte = cpu.mmu.read(cpu.hl());
sub_set_flags(cpu, cpu.a, byte);
@@ -927,6 +936,11 @@ fn rst_08h(cpu: &mut Cpu) {
rst(cpu, 0x0008);
}
+fn sub_a_u8(cpu: &mut Cpu) {
+ let byte = cpu.read_u8();
+ cpu.a = sub_set_flags(cpu, cpu.a, byte);
+}
+
fn ld_mff00u8_a(cpu: &mut Cpu) {
let byte = cpu.read_u8();
cpu.mmu.write(0xff00 + byte as u16, cpu.a);
--
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