From 7c6d58fd6b860ad73cbb5c1aa911af9a05b2c60b Mon Sep 17 00:00:00 2001
From: Ben Kurtovic <ben.kurtovic@gmail.com>
Date: Fri, 22 Apr 2016 05:47:24 -0500
Subject: [PATCH] XOR r; LD (nn, A)

---
 src/z80_ops.inc.c    | 29 +++++++++++++++++++++++++++--
 src/z80_tables.inc.c | 16 ++++++++--------
 2 files changed, 35 insertions(+), 10 deletions(-)

diff --git a/src/z80_ops.inc.c b/src/z80_ops.inc.c
index a4f3303..2064a80 100644
--- a/src/z80_ops.inc.c
+++ b/src/z80_ops.inc.c
@@ -139,9 +139,17 @@ static uint8_t z80_inst_ld_r_hl(Z80 *z80, uint8_t opcode)
 // static uint8_t z80_inst_ld_de_a(Z80 *z80, uint8_t opcode)
 
 /*
-    LD (nn), A
+    LD (nn), A (0x32):
+    Load a into memory address nn.
 */
-// static uint8_t z80_inst_ld_nn_a(Z80 *z80, uint8_t opcode)
+static uint8_t z80_inst_ld_nn_a(Z80 *z80, uint8_t opcode)
+{
+    (void) opcode;
+    uint16_t addr = mmu_read_double(z80->mmu, ++z80->regfile.pc);
+    mmu_write_byte(z80->mmu, addr, z80->regfile.a);
+    z80->regfile.pc += 2;
+    return 13;
+}
 
 /*
     LD A, I
@@ -284,6 +292,23 @@ static uint8_t z80_inst_exx(Z80 *z80, uint8_t opcode)
 
 // XOR s
 
+/*
+    XOR r (0xA8, 0xA9, 0xAA, 0xAB, 0xAC, 0xAD, 0xAF):
+    Bitwise XOR a with r (8-bit register).
+*/
+static uint8_t z80_inst_xor_r(Z80 *z80, uint8_t opcode)
+{
+    uint8_t *reg = extract_reg(z80, opcode);
+    uint8_t a = (z80->regfile.a ^= *reg);
+
+    bool parity = !(__builtin_popcount(a) % 2);
+    update_flags(z80, 0, 0, parity, !!(a & 0x08), 0, !!(a & 0x20), a == 0,
+                 !!(a & 0x80), 0xFF);
+
+    z80->regfile.pc++;
+    return 4;
+}
+
 // CP s
 
 /*
diff --git a/src/z80_tables.inc.c b/src/z80_tables.inc.c
index 5cf9a6d..f1b5120 100644
--- a/src/z80_tables.inc.c
+++ b/src/z80_tables.inc.c
@@ -52,7 +52,7 @@ static DispatchTable instruction_table = {
     [0x2F] = z80_inst_unimplemented,  // TODO
     [0x30] = z80_inst_unimplemented,  // TODO
     [0x31] = z80_inst_ld_dd_nn,
-    [0x32] = z80_inst_unimplemented,  // TODO
+    [0x32] = z80_inst_ld_nn_a,
     [0x33] = z80_inst_inc_ss,
     [0x34] = z80_inst_unimplemented,  // TODO
     [0x35] = z80_inst_unimplemented,  // TODO
@@ -170,14 +170,14 @@ static DispatchTable instruction_table = {
     [0xA5] = z80_inst_unimplemented,  // TODO
     [0xA6] = z80_inst_unimplemented,  // TODO
     [0xA7] = z80_inst_unimplemented,  // TODO
-    [0xA8] = z80_inst_unimplemented,  // TODO
-    [0xA9] = z80_inst_unimplemented,  // TODO
-    [0xAA] = z80_inst_unimplemented,  // TODO
-    [0xAB] = z80_inst_unimplemented,  // TODO
-    [0xAC] = z80_inst_unimplemented,  // TODO
-    [0xAD] = z80_inst_unimplemented,  // TODO
+    [0xA8] = z80_inst_xor_r,
+    [0xA9] = z80_inst_xor_r,
+    [0xAA] = z80_inst_xor_r,
+    [0xAB] = z80_inst_xor_r,
+    [0xAC] = z80_inst_xor_r,
+    [0xAD] = z80_inst_xor_r,
     [0xAE] = z80_inst_unimplemented,  // TODO
-    [0xAF] = z80_inst_unimplemented,  // TODO
+    [0xAF] = z80_inst_xor_r,
     [0xB0] = z80_inst_unimplemented,  // TODO
     [0xB1] = z80_inst_unimplemented,  // TODO
     [0xB2] = z80_inst_unimplemented,  // TODO