From b65300792e0ed9c8f40ee463fbb8f547263ae81c Mon Sep 17 00:00:00 2001
From: Franco Colmenarez <info@francoacg.com>
Date: Thu, 28 Dec 2023 21:01:33 -0500
Subject: [PATCH] eor

---
 snes-core/src/cpu/instructionstemp/eor.rs | 92 +++++++++++++++++++++++
 snes-core/src/cpu/instructionstemp/mod.rs |  1 +
 2 files changed, 93 insertions(+)
 create mode 100644 snes-core/src/cpu/instructionstemp/eor.rs

diff --git a/snes-core/src/cpu/instructionstemp/eor.rs b/snes-core/src/cpu/instructionstemp/eor.rs
new file mode 100644
index 0000000..b2d00ac
--- /dev/null
+++ b/snes-core/src/cpu/instructionstemp/eor.rs
@@ -0,0 +1,92 @@
+use crate::{cpu::{bus::Bus, registers::Registers}, utils::{alu, addressing::AddressingMode}};
+
+use crate::cpu::cycles;
+use super::{CPUInstruction, Decode, read_8bit_from_address, read_16bit_from_address};
+use super::decoder_common;
+
+static INSTR_NAME: &'static str = "EOR";
+
+pub struct EOR8 {
+    addressing_mode: AddressingMode,
+}
+
+impl CPUInstruction for EOR8 {
+    fn execute(&self, registers: &mut Registers, bus: &mut Bus) {
+        let value = read_8bit_from_address(registers, bus, self.addressing_mode);
+        let (result, affected_flags) = alu::eor(registers.a as u8, value);
+        registers.set_low_a(result);
+        registers.set_flags(&affected_flags);
+        let (bytes, cycles) = cycles::increment_cycles_bitwise(&registers, self.addressing_mode);
+        registers.increment_pc(bytes); registers.cycles += cycles;
+    }
+}
+
+impl Decode for EOR8 {
+    fn mnemonic(&self, registers: &Registers, bus: &Bus, opcode: u8) -> String {
+        decoder_common::mnemonic_arithmetic(false, opcode, INSTR_NAME, self.addressing_mode, registers, bus)
+    }
+}
+
+pub struct EOR16 {
+    addressing_mode: AddressingMode,
+}
+
+impl CPUInstruction for EOR16 {
+    fn execute(&self, registers: &mut Registers, bus: &mut Bus) {
+        let value = read_16bit_from_address(registers, bus, self.addressing_mode);
+        let (result, affected_flags) = alu::eor(registers.a, value);
+        registers.a = result;
+        registers.set_flags(&affected_flags);
+        let (bytes, cycles) = cycles::increment_cycles_bitwise(&registers, self.addressing_mode);
+        registers.increment_pc(bytes); registers.cycles += cycles;
+    }
+}
+
+impl Decode for EOR16 {
+    fn mnemonic(&self, registers: &Registers, bus: &Bus, opcode: u8) -> String {
+        decoder_common::mnemonic_arithmetic(true, opcode, INSTR_NAME, self.addressing_mode, registers, bus)
+    }
+}
+
+
+#[cfg(test)]
+mod cpu_instructions_tests {
+    use super::*;
+
+    #[test]
+    fn test_8bit() {
+        let mut registers = Registers::new();
+        let mut bus = Bus::new();
+        registers.a   = 0x0F;
+        registers.pbr = 0x00;
+        registers.pc  = 0x0000;
+        registers.set_16bit_mode(false);
+        bus.write(0x000001, 0xF0);
+        let instruction = EOR8{addressing_mode: AddressingMode::Immediate};
+        instruction.execute(&mut registers, &mut bus);
+        assert_eq!(registers.a, 0xFF);
+        assert_eq!(registers.pc, 0x02);
+        assert_eq!(registers.cycles, 2);
+        assert!(registers.get_negative_flag());
+        assert!(!registers.get_zero_flag());
+    }
+
+    #[test]
+    fn test_and_16bit() {
+        let mut registers = Registers::new();
+        let mut bus = Bus::new();
+        registers.a   = 0x0FFF;
+        registers.pbr = 0x00;
+        registers.pc  = 0x0000;
+        registers.set_16bit_mode(false);
+        bus.write(0x000002, 0xF0);
+        bus.write(0x000001, 0x00);
+        let instruction = EOR16{addressing_mode: AddressingMode::Immediate};
+        instruction.execute(&mut registers, &mut bus);
+        assert_eq!(registers.a, 0xFFFF);
+        assert_eq!(registers.pc, 0x02);
+        assert_eq!(registers.cycles, 2);
+        assert!(registers.get_negative_flag());
+        assert!(!registers.get_zero_flag());
+    }
+}
diff --git a/snes-core/src/cpu/instructionstemp/mod.rs b/snes-core/src/cpu/instructionstemp/mod.rs
index 588e090..da9c903 100644
--- a/snes-core/src/cpu/instructionstemp/mod.rs
+++ b/snes-core/src/cpu/instructionstemp/mod.rs
@@ -28,6 +28,7 @@ pub mod cpy;
 pub mod dec;
 pub mod dex;
 pub mod dey;
+pub mod eor;
 pub mod bit_common;
 pub mod dec_common;
 pub mod decoder_common;