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i8080.c
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i8080.c
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/* Intel 8080 CPU emulator.
Copyright (C) 2023-2024 Collin Funk
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
#include "i8080.h"
#define FLAG_C 0x01 /* Carry flag */
/* 0x02 is always set to 1. */
#define FLAG_P 0x04 /* Parity flag */
/* 0x08 is always set to 0. */
#define FLAG_AC 0x10 /* Aux. carry flag */
/* 0x20 is always set to 0. */
#define FLAG_Z 0x40 /* Zero flag */
#define FLAG_S 0x80 /* Sign flag */
/*
* Parity lookup table. 1 for even parity, 0 for odd.
* This is generated from a file in /misc.
*/
static const uint8_t parity_table[256] = {
1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1, 0, 1, 1, 0, 1, 0, 0, 1, 1, 0,
0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0, 1, 0, 0, 1,
0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1, 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1,
1, 0, 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0,
0, 1, 1, 0, 1, 0, 0, 1, 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0, 0, 1,
1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0, 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0,
1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1, 0, 1, 1, 0, 1, 0,
0, 1, 1, 0, 0, 1, 0, 1, 1, 0, 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1,
0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1, 1, 0,
0, 1, 0, 1, 1, 0, 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1,
};
/*
* Tables used for setting the auxiliary carry bit in the flags
* register. The flag should be set when there is a carry out of bit 3.
* It is affected by all addition, subtraction, increment, decrement,
* and compare instructions.
*/
static const uint8_t ac_table[8] = { 0, 0, 1, 0, 1, 0, 1, 1 };
static const uint8_t subtract_ac_table[8] = { 1, 0, 0, 0, 1, 1, 1, 0 };
static void
set_flag_to (struct i8080 *ctx, uint8_t mask, int val)
{
if (val == 0)
ctx->f &= ~mask;
else
ctx->f |= mask;
}
static uint16_t
get_psw (struct i8080 *ctx)
{
return ((uint16_t) ctx->a << 8) | ((uint16_t) ctx->f);
}
static uint16_t
get_bc (struct i8080 *ctx)
{
return ((uint16_t) ctx->b << 8) | ((uint16_t) ctx->c);
}
static uint16_t
get_de (struct i8080 *ctx)
{
return ((uint16_t) ctx->d << 8) | ((uint16_t) ctx->e);
}
static uint16_t
get_hl (struct i8080 *ctx)
{
return ((uint16_t) ctx->h << 8) | ((uint16_t) ctx->l);
}
static void
set_psw (struct i8080 *ctx, uint16_t val)
{
ctx->a = (val >> 8) & UINT8_MAX;
ctx->f = val & UINT8_MAX;
}
static void
set_bc (struct i8080 *ctx, uint16_t val)
{
ctx->b = (val >> 8) & UINT8_MAX;
ctx->c = val & UINT8_MAX;
}
static void
set_de (struct i8080 *ctx, uint16_t val)
{
ctx->d = (val >> 8) & UINT8_MAX;
ctx->e = val & UINT8_MAX;
}
static void
set_hl (struct i8080 *ctx, uint16_t val)
{
ctx->h = (val >> 8) & UINT8_MAX;
ctx->l = val & UINT8_MAX;
}
static uint8_t
read_byte (struct i8080 *ctx, uint16_t address)
{
return ctx->read_byte (ctx->user_data, address);
}
static void
write_byte (struct i8080 *ctx, uint16_t address, uint8_t val)
{
ctx->write_byte (ctx->user_data, address, val);
}
static uint16_t
read_word (struct i8080 *ctx, uint16_t address)
{
return ((uint16_t) read_byte (ctx, address))
| ((uint16_t) read_byte (ctx, address + 1) << 8);
}
static void
write_word (struct i8080 *ctx, uint16_t address, uint16_t val)
{
write_byte (ctx, address, val & UINT8_MAX);
write_byte (ctx, address + 1, (val >> 8) & UINT8_MAX);
}
static uint8_t
fetch_byte (struct i8080 *ctx)
{
return read_byte (ctx, ctx->pc++);
}
static uint16_t
fetch_word (struct i8080 *ctx)
{
uint16_t w;
w = read_word (ctx, ctx->pc);
ctx->pc += 2;
return w;
}
static uint16_t
pop_word (struct i8080 *ctx)
{
uint16_t w;
w = read_word (ctx, ctx->sp);
ctx->sp += 2;
return w;
}
static void
push_word (struct i8080 *ctx, uint16_t val)
{
ctx->sp -= 2;
write_word (ctx, ctx->sp, val);
}
static void
op_jmp (struct i8080 *ctx)
{
ctx->pc = fetch_word (ctx);
}
static void
op_call (struct i8080 *ctx)
{
push_word (ctx, ctx->pc + 2);
ctx->pc = fetch_word (ctx);
}
static void
op_ret (struct i8080 *ctx)
{
ctx->pc = pop_word (ctx);
}
static void
op_rst (struct i8080 *ctx, uint16_t address)
{
push_word (ctx, ctx->pc);
ctx->pc = address;
}
static void
op_xchg (struct i8080 *ctx)
{
uint16_t tmp16;
tmp16 = get_hl (ctx);
set_hl (ctx, get_de (ctx));
set_de (ctx, tmp16);
}
static void
op_xthl (struct i8080 *ctx)
{
uint16_t tmp16;
tmp16 = read_word (ctx, ctx->sp);
write_word (ctx, ctx->sp, get_hl (ctx));
set_hl (ctx, tmp16);
}
static void
op_add (struct i8080 *ctx, uint8_t val)
{
uint16_t tmp16;
uint8_t acindex;
tmp16 = ctx->a + val;
acindex
= ((ctx->a & 0x88) >> 1) | ((val & 0x88) >> 2) | ((tmp16 & 0x88) >> 3);
ctx->a = tmp16 & UINT8_MAX;
set_flag_to (ctx, FLAG_C, (tmp16 & 0x100) != 0);
set_flag_to (ctx, FLAG_P, parity_table[ctx->a]);
set_flag_to (ctx, FLAG_AC, ac_table[acindex & 7]);
set_flag_to (ctx, FLAG_Z, ctx->a == 0);
set_flag_to (ctx, FLAG_S, (ctx->a & 0x80) != 0);
}
static void
op_adc (struct i8080 *ctx, uint8_t val)
{
uint16_t tmp16;
uint8_t acindex;
tmp16 = ctx->a + val + ((ctx->f & FLAG_C) != 0);
acindex
= ((ctx->a & 0x88) >> 1) | ((val & 0x88) >> 2) | ((tmp16 & 0x88) >> 3);
ctx->a = tmp16 & UINT8_MAX;
set_flag_to (ctx, FLAG_C, (tmp16 & 0x100) != 0);
set_flag_to (ctx, FLAG_P, parity_table[ctx->a]);
set_flag_to (ctx, FLAG_AC, ac_table[acindex & 7]);
set_flag_to (ctx, FLAG_Z, ctx->a == 0);
set_flag_to (ctx, FLAG_S, (ctx->a & 0x80) != 0);
}
static void
op_sub (struct i8080 *ctx, uint8_t val)
{
uint16_t tmp16;
uint8_t acindex;
tmp16 = ctx->a - val;
acindex
= ((ctx->a & 0x88) >> 1) | ((val & 0x88) >> 2) | ((tmp16 & 0x88) >> 3);
ctx->a = tmp16 & UINT8_MAX;
set_flag_to (ctx, FLAG_C, (tmp16 & 0x100) != 0);
set_flag_to (ctx, FLAG_P, parity_table[ctx->a]);
set_flag_to (ctx, FLAG_AC, subtract_ac_table[acindex & 7]);
set_flag_to (ctx, FLAG_Z, ctx->a == 0);
set_flag_to (ctx, FLAG_S, (ctx->a & 0x80) != 0);
}
static void
op_sbb (struct i8080 *ctx, uint8_t val)
{
uint16_t tmp16;
uint8_t acindex;
tmp16 = ctx->a - val - ((ctx->f & FLAG_C) != 0);
acindex
= ((ctx->a & 0x88) >> 1) | ((val & 0x88) >> 2) | ((tmp16 & 0x88) >> 3);
ctx->a = tmp16 & UINT8_MAX;
set_flag_to (ctx, FLAG_C, (tmp16 & 0x100) != 0);
set_flag_to (ctx, FLAG_P, parity_table[ctx->a]);
set_flag_to (ctx, FLAG_AC, subtract_ac_table[acindex & 7]);
set_flag_to (ctx, FLAG_Z, ctx->a == 0);
set_flag_to (ctx, FLAG_S, (ctx->a & 0x80) != 0);
}
static void
op_ana (struct i8080 *ctx, uint8_t val)
{
uint8_t tmp8;
tmp8 = ctx->a & val;
ctx->f &= ~FLAG_C;
set_flag_to (ctx, FLAG_P, parity_table[tmp8]);
set_flag_to (ctx, FLAG_AC, ((ctx->a | val) & 0x08) != 0);
set_flag_to (ctx, FLAG_Z, tmp8 == 0);
set_flag_to (ctx, FLAG_S, (tmp8 & 0x80) != 0);
ctx->a = tmp8;
}
static void
op_xra (struct i8080 *ctx, uint8_t val)
{
uint8_t tmp8;
tmp8 = ctx->a ^ val;
ctx->f &= ~FLAG_C;
set_flag_to (ctx, FLAG_P, parity_table[tmp8]);
ctx->f &= ~FLAG_AC;
set_flag_to (ctx, FLAG_Z, tmp8 == 0);
set_flag_to (ctx, FLAG_S, (tmp8 & 0x80) != 0);
ctx->a = tmp8;
}
static void
op_ora (struct i8080 *ctx, uint8_t val)
{
uint8_t tmp8;
tmp8 = ctx->a | val;
ctx->f &= ~FLAG_C;
set_flag_to (ctx, FLAG_P, parity_table[tmp8]);
ctx->f &= ~FLAG_AC;
set_flag_to (ctx, FLAG_Z, tmp8 == 0);
set_flag_to (ctx, FLAG_S, (tmp8 & 0x80) != 0);
ctx->a = tmp8;
}
static void
op_cmp (struct i8080 *ctx, uint8_t val)
{
uint16_t tmp16;
uint8_t acindex;
tmp16 = ctx->a - val;
acindex
= ((ctx->a & 0x88) >> 1) | ((val & 0x88) >> 2) | ((tmp16 & 0x88) >> 3);
set_flag_to (ctx, FLAG_C, (tmp16 & 0x100) != 0);
set_flag_to (ctx, FLAG_P, parity_table[tmp16 & UINT8_MAX]);
set_flag_to (ctx, FLAG_AC, subtract_ac_table[acindex & 7]);
set_flag_to (ctx, FLAG_Z, (tmp16 & UINT8_MAX) == 0);
set_flag_to (ctx, FLAG_S, (tmp16 & 0x80) != 0);
}
static uint8_t
op_inr (struct i8080 *ctx, uint8_t val)
{
uint8_t tmp8;
tmp8 = val + 1;
set_flag_to (ctx, FLAG_P, parity_table[tmp8]);
set_flag_to (ctx, FLAG_AC, (tmp8 & 0x0f) == 0);
set_flag_to (ctx, FLAG_Z, tmp8 == 0);
set_flag_to (ctx, FLAG_S, (tmp8 & 0x80) != 0);
return tmp8;
}
static uint8_t
op_dcr (struct i8080 *ctx, uint8_t val)
{
uint8_t tmp8;
tmp8 = val - 1;
set_flag_to (ctx, FLAG_P, parity_table[tmp8]);
set_flag_to (ctx, FLAG_AC, !((tmp8 & 0x0f) == 0x0f));
set_flag_to (ctx, FLAG_Z, tmp8 == 0);
set_flag_to (ctx, FLAG_S, (tmp8 & 0x80) != 0);
return tmp8;
}
static void
op_dad (struct i8080 *ctx, uint16_t val)
{
uint32_t tmp32;
tmp32 = get_hl (ctx) + val;
set_flag_to (ctx, FLAG_C, (tmp32 & 0x10000) != 0);
set_hl (ctx, tmp32 & UINT16_MAX);
}
static void
op_rlc (struct i8080 *ctx)
{
set_flag_to (ctx, FLAG_C, (ctx->a & 0x80) != 0);
ctx->a = (ctx->a << 1) | ((ctx->f & FLAG_C) != 0);
}
static void
op_rrc (struct i8080 *ctx)
{
set_flag_to (ctx, FLAG_C, ctx->a & 0x01);
ctx->a = (ctx->a >> 1) | (((ctx->f & FLAG_C) != 0) << 7);
}
static void
op_ral (struct i8080 *ctx)
{
uint8_t tmp8;
tmp8 = ((ctx->f & FLAG_C) != 0);
set_flag_to (ctx, FLAG_C, (ctx->a & 0x80) != 0);
ctx->a = (ctx->a << 1) | tmp8;
}
static void
op_rar (struct i8080 *ctx)
{
uint8_t tmp8;
tmp8 = ((ctx->f & FLAG_C) != 0);
set_flag_to (ctx, FLAG_C, ctx->a & 0x01);
ctx->a = (ctx->a >> 1) | (tmp8 << 7);
}
static void
op_daa (struct i8080 *ctx)
{
uint8_t ahi, alo, c, auxc, newc, inc;
ahi = (ctx->a >> 4) & 0x0f;
alo = ctx->a & 0x0f;
c = ((ctx->f & FLAG_C) != 0);
auxc = ((ctx->f & FLAG_AC) != 0);
newc = inc = 0;
if (alo > 9 || auxc != 0)
inc += 0x06;
if (ahi > 9 || c != 0 || (ahi >= 9 && alo > 9))
{
newc = 1;
inc += 0x60;
}
op_add (ctx, inc);
set_flag_to (ctx, FLAG_C, newc == 1);
}
void
i8080_init (struct i8080 *ctx, void *user_data,
uint8_t (*read_byte) (void *, uint16_t),
void (*write_byte) (void *, uint16_t, uint8_t),
uint8_t (*io_inb) (void *, uint8_t),
void (*io_outb) (void *, uint8_t, uint8_t))
{
ctx->a = 0;
ctx->f = 0x02;
ctx->b = 0;
ctx->c = 0;
ctx->d = 0;
ctx->e = 0;
ctx->h = 0;
ctx->l = 0;
ctx->sp = 0;
ctx->pc = 0;
ctx->halted = false;
ctx->int_enable = false;
ctx->int_requested = false;
ctx->int_opcode = 0;
ctx->cycles = 0;
ctx->user_data = user_data;
ctx->read_byte = read_byte;
ctx->write_byte = write_byte;
ctx->io_inb = io_inb;
ctx->io_outb = io_outb;
}
void
i8080_step (struct i8080 *ctx)
{
/* If an interrupt is requested */
if (ctx->int_requested && ctx->int_enable)
{
/* Acknowledge request and reset INTE. */
ctx->int_enable = false;
ctx->int_requested = false;
/* Interrupt occured so unhalt */
ctx->halted = false;
/* Execute the requested opcode */
i8080_exec_opcode (ctx, ctx->int_opcode);
}
else if (!ctx->halted)
i8080_exec_opcode (ctx, fetch_byte (ctx));
}
void
i8080_interrupt (struct i8080 *ctx, uint8_t opcode)
{
ctx->int_requested = true;
ctx->int_opcode = opcode;
}
void
i8080_exec_opcode (struct i8080 *ctx, uint8_t opcode)
{
switch (opcode)
{
case 0x00: /* NOP */
ctx->cycles += 4;
break;
case 0x01: /* LXI B */
set_bc (ctx, fetch_word (ctx));
ctx->cycles += 10;
break;
case 0x02: /* STAX B */
write_byte (ctx, get_bc (ctx), ctx->a);
ctx->cycles += 7;
break;
case 0x03: /* INX B */
if (++ctx->c == 0)
ctx->b++;
ctx->cycles += 5;
break;
case 0x04: /* INR B */
ctx->b = op_inr (ctx, ctx->b);
ctx->cycles += 5;
break;
case 0x05: /* DCR B */
ctx->b = op_dcr (ctx, ctx->b);
ctx->cycles += 5;
break;
case 0x06: /* MVI B */
ctx->b = fetch_byte (ctx);
ctx->cycles += 7;
break;
case 0x07: /* RLC */
op_rlc (ctx);
ctx->cycles += 4;
break;
case 0x08: /* NOP (Undocumented) */
ctx->cycles += 4;
break;
case 0x09: /* DAD B */
op_dad (ctx, get_bc (ctx));
ctx->cycles += 10;
break;
case 0x0a: /* LDAX B */
ctx->a = read_byte (ctx, get_bc (ctx));
ctx->cycles += 7;
break;
case 0x0b: /* DCX B */
if (--ctx->c == UINT8_MAX)
ctx->b--;
ctx->cycles += 5;
break;
case 0x0c: /* INR C */
ctx->c = op_inr (ctx, ctx->c);
ctx->cycles += 5;
break;
case 0x0d: /* DCR C */
ctx->c = op_dcr (ctx, ctx->c);
ctx->cycles += 5;
break;
case 0x0e: /* MVI C */
ctx->c = fetch_byte (ctx);
ctx->cycles += 7;
break;
case 0x0f: /* RRC */
op_rrc (ctx);
ctx->cycles += 4;
break;
case 0x10: /* NOP (Undocumented) */
ctx->cycles += 4;
break;
case 0x11: /* LXI D */
set_de (ctx, fetch_word (ctx));
ctx->cycles += 10;
break;
case 0x12: /* STAX D */
write_byte (ctx, get_de (ctx), ctx->a);
ctx->cycles += 7;
break;
case 0x13: /* INX D */
if (++ctx->e == 0)
ctx->d++;
ctx->cycles += 5;
break;
case 0x14: /* INR D */
ctx->d = op_inr (ctx, ctx->d);
ctx->cycles += 5;
break;
case 0x15: /* DCR D */
ctx->d = op_dcr (ctx, ctx->d);
ctx->cycles += 5;
break;
case 0x16: /* MVI D */
ctx->d = fetch_byte (ctx);
ctx->cycles += 7;
break;
case 0x17: /* RAL */
op_ral (ctx);
ctx->cycles += 4;
break;
case 0x18: /* NOP (Undocumented) */
ctx->cycles += 4;
break;
case 0x19: /* DAD D */
op_dad (ctx, get_de (ctx));
ctx->cycles += 10;
break;
case 0x1a: /* LDAX D */
ctx->a = read_byte (ctx, get_de (ctx));
ctx->cycles += 7;
break;
case 0x1b: /* DCX D */
if (--ctx->e == UINT8_MAX)
ctx->d--;
ctx->cycles += 5;
break;
case 0x1c: /* INR E */
ctx->e = op_inr (ctx, ctx->e);
ctx->cycles += 5;
break;
case 0x1d: /* DCR E */
ctx->e = op_dcr (ctx, ctx->e);
ctx->cycles += 5;
break;
case 0x1e: /* MVI E */
ctx->e = fetch_byte (ctx);
ctx->cycles += 7;
break;
case 0x1f: /* RAR */
op_rar (ctx);
ctx->cycles += 4;
break;
case 0x20: /* NOP (Undocumented) */
ctx->cycles += 4;
break;
case 0x21: /* LXI H */
set_hl (ctx, fetch_word (ctx));
ctx->cycles += 10;
break;
case 0x22: /* SHLD */
write_word (ctx, fetch_word (ctx), get_hl (ctx));
ctx->cycles += 16;
break;
case 0x23: /* INX H */
if (++ctx->l == 0)
ctx->h++;
ctx->cycles += 5;
break;
case 0x24: /* INR H */
ctx->h = op_inr (ctx, ctx->h);
ctx->cycles += 5;
break;
case 0x25: /* DCR H */
ctx->h = op_dcr (ctx, ctx->h);
ctx->cycles += 5;
break;
case 0x26: /* MVI H */
ctx->h = fetch_byte (ctx);
ctx->cycles += 7;
break;
case 0x27: /* DAA */
op_daa (ctx);
ctx->cycles += 4;
break;
case 0x28: /* NOP (Undocumented) */
ctx->cycles += 4;
break;
case 0x29: /* DAD H */
op_dad (ctx, get_hl (ctx));
ctx->cycles += 10;
break;
case 0x2a: /* LHLD */
set_hl (ctx, read_word (ctx, fetch_word (ctx)));
ctx->cycles += 16;
break;
case 0x2b: /* DCX H */
if (--ctx->l == UINT8_MAX)
ctx->h--;
ctx->cycles += 5;
break;
case 0x2c: /* INR L */
ctx->l = op_inr (ctx, ctx->l);
ctx->cycles += 5;
break;
case 0x2d: /* DCR L */
ctx->l = op_dcr (ctx, ctx->l);
ctx->cycles += 5;
break;
case 0x2e: /* MVI L */
ctx->l = fetch_byte (ctx);
ctx->cycles += 7;
break;
case 0x2f: /* CMA */
ctx->a ^= UINT8_MAX;
ctx->cycles += 4;
break;
case 0x30: /* NOP (Undocumented) */
ctx->cycles += 4;
break;
case 0x31: /* LXI SP */
ctx->sp = fetch_word (ctx);
ctx->cycles += 10;
break;
case 0x32: /* STA */
write_byte (ctx, fetch_word (ctx), ctx->a);
ctx->cycles += 13;
break;
case 0x33: /* INX SP */
ctx->sp++;
ctx->cycles += 5;
break;
case 0x34: /* INR M */
write_byte (ctx, get_hl (ctx),
op_inr (ctx, read_byte (ctx, get_hl (ctx))));
ctx->cycles += 10;
break;
case 0x35: /* DCR M */
write_byte (ctx, get_hl (ctx),
op_dcr (ctx, read_byte (ctx, get_hl (ctx))));
ctx->cycles += 10;
break;
case 0x36: /* MVI M */
write_byte (ctx, get_hl (ctx), fetch_byte (ctx));
ctx->cycles += 10;
break;
case 0x37: /* STC */
ctx->f |= FLAG_C;
ctx->cycles += 4;
break;
case 0x38: /* NOP (Undocumented) */
ctx->cycles += 4;
break;
case 0x39: /* DAD SP */
op_dad (ctx, ctx->sp);
ctx->cycles += 10;
break;
case 0x3a: /* LDA */
ctx->a = read_byte (ctx, fetch_word (ctx));
ctx->cycles += 13;
break;
case 0x3b: /* DCX SP */
ctx->sp--;
ctx->cycles += 5;
break;
case 0x3c: /* INR A */
ctx->a = op_inr (ctx, ctx->a);
ctx->cycles += 5;
break;
case 0x3d: /* DCR A */
ctx->a = op_dcr (ctx, ctx->a);
ctx->cycles += 5;
break;
case 0x3e: /* MVI A */
ctx->a = fetch_byte (ctx);
ctx->cycles += 7;
break;
case 0x3f: /* CMC */
if (ctx->f & FLAG_C)
ctx->f &= ~FLAG_C;
else
ctx->f |= FLAG_C;
ctx->cycles += 4;
break;
case 0x40: /* MOV B, B */
ctx->b = ctx->b;
ctx->cycles += 5;
break;
case 0x41: /* MOV B, C */
ctx->b = ctx->c;
ctx->cycles += 5;
break;
case 0x42: /* MOV B, D */
ctx->b = ctx->d;
ctx->cycles += 5;
break;
case 0x43: /* MOV B, E */
ctx->b = ctx->e;
ctx->cycles += 5;
break;
case 0x44: /* MOV B, H */
ctx->b = ctx->h;
ctx->cycles += 5;
break;
case 0x45: /* MOV B, L */
ctx->b = ctx->l;
ctx->cycles += 5;
break;
case 0x46: /* MOV B, M */
ctx->b = read_byte (ctx, get_hl (ctx));
ctx->cycles += 7;
break;
case 0x47: /* MOV B, A */
ctx->b = ctx->a;
ctx->cycles += 5;
break;
case 0x48: /* MOV C, B */
ctx->c = ctx->b;
ctx->cycles += 5;
break;
case 0x49: /* MOV C, C */
ctx->c = ctx->c;
ctx->cycles += 5;
break;
case 0x4a: /* MOV C, D */
ctx->c = ctx->d;
ctx->cycles += 5;
break;
case 0x4b: /* MOV C, E */
ctx->c = ctx->e;
ctx->cycles += 5;
break;
case 0x4c: /* MOV C, H */
ctx->c = ctx->h;
ctx->cycles += 5;
break;
case 0x4d: /* MOV C, L */
ctx->c = ctx->l;
ctx->cycles += 5;
break;
case 0x4e: /* MOV C, M */
ctx->c = read_byte (ctx, get_hl (ctx));
ctx->cycles += 7;
break;
case 0x4f: /* MOV C, A */
ctx->c = ctx->a;
ctx->cycles += 5;
break;
case 0x50: /* MOV D, B */
ctx->d = ctx->b;
ctx->cycles += 5;
break;
case 0x51: /* MOV D, C */
ctx->d = ctx->c;
ctx->cycles += 5;
break;
case 0x52: /* MOV D, D */
ctx->d = ctx->d;
ctx->cycles += 5;
break;
case 0x53: /* MOV D, E */
ctx->d = ctx->e;
ctx->cycles += 5;
break;
case 0x54: /* MOV D, H */
ctx->d = ctx->h;
ctx->cycles += 5;
break;
case 0x55: /* MOV D, L */
ctx->d = ctx->l;
ctx->cycles += 5;
break;
case 0x56: /* MOV D, M */
ctx->d = read_byte (ctx, get_hl (ctx));
ctx->cycles += 7;
break;
case 0x57: /* MOV D, A */
ctx->d = ctx->a;
ctx->cycles += 5;
break;
case 0x58: /* MOV E, B */
ctx->e = ctx->b;
ctx->cycles += 5;
break;
case 0x59: /* MOV E, C */
ctx->e = ctx->c;
ctx->cycles += 5;
break;
case 0x5a: /* MOV E, D */
ctx->e = ctx->d;
ctx->cycles += 5;
break;
case 0x5b: /* MOV E, E */
ctx->e = ctx->e;
ctx->cycles += 5;
break;
case 0x5c: /* MOV E, H */
ctx->e = ctx->h;
ctx->cycles += 5;
break;
case 0x5d: /* MOV E, L */
ctx->e = ctx->l;
ctx->cycles += 5;
break;
case 0x5e: /* MOV E, M */
ctx->e = read_byte (ctx, get_hl (ctx));
ctx->cycles += 7;
break;
case 0x5f: /* MOV E, A */
ctx->e = ctx->a;
ctx->cycles += 5;
break;
case 0x60: /* MOV H, B */
ctx->h = ctx->b;
ctx->cycles += 5;
break;
case 0x61: /* MOV H, C */
ctx->h = ctx->c;
ctx->cycles += 5;
break;
case 0x62: /* MOV H, D */
ctx->h = ctx->d;
ctx->cycles += 5;
break;
case 0x63: /* MOV H, E */
ctx->h = ctx->e;
ctx->cycles += 5;
break;
case 0x64: /* MOV H, H */
ctx->h = ctx->h;
ctx->cycles += 5;
break;
case 0x65: /* MOV H, L */
ctx->h = ctx->l;
ctx->cycles += 5;
break;
case 0x66: /* MOV H, M */
ctx->h = read_byte (ctx, get_hl (ctx));
ctx->cycles += 7;
break;
case 0x67: /* MOV H, A */
ctx->h = ctx->a;
ctx->cycles += 5;
break;
case 0x68: /* MOV L, B */
ctx->l = ctx->b;
ctx->cycles += 5;
break;
case 0x69: /* MOV L, C */
ctx->l = ctx->c;
ctx->cycles += 5;
break;
case 0x6a: /* MOV L, D */
ctx->l = ctx->d;
ctx->cycles += 5;
break;
case 0x6b: /* MOV L, E */
ctx->l = ctx->e;
ctx->cycles += 5;
break;
case 0x6c: /* MOV L, H */
ctx->l = ctx->h;
ctx->cycles += 5;
break;
case 0x6d: /* MOV L, L */
ctx->l = ctx->l;
ctx->cycles += 5;
break;
case 0x6e: /* MOV L, M */
ctx->l = read_byte (ctx, get_hl (ctx));
ctx->cycles += 7;
break;
case 0x6f: /* MOV L, A */
ctx->l = ctx->a;
ctx->cycles += 5;
break;
case 0x70: /* MOV M, B */
write_byte (ctx, get_hl (ctx), ctx->b);
ctx->cycles += 7;
break;
case 0x71: /* MOV M, C */
write_byte (ctx, get_hl (ctx), ctx->c);
ctx->cycles += 7;
break;
case 0x72: /* MOV M, D */
write_byte (ctx, get_hl (ctx), ctx->d);
ctx->cycles += 7;
break;
case 0x73: /* MOV M, E */
write_byte (ctx, get_hl (ctx), ctx->e);
ctx->cycles += 7;
break;
case 0x74: /* MOV M, H */
write_byte (ctx, get_hl (ctx), ctx->h);
ctx->cycles += 7;
break;
case 0x75: /* MOV M, L */
write_byte (ctx, get_hl (ctx), ctx->l);
ctx->cycles += 7;
break;
case 0x76: /* HLT */
ctx->halted = true;
ctx->cycles += 7;
break;
case 0x77: /* MOV M, A */
write_byte (ctx, get_hl (ctx), ctx->a);
ctx->cycles += 7;
break;
case 0x78: /* MOV A, B */
ctx->a = ctx->b;
ctx->cycles += 5;
break;
case 0x79: /* MOV A, C */
ctx->a = ctx->c;
ctx->cycles += 5;
break;
case 0x7a: /* MOV A, D */
ctx->a = ctx->d;
ctx->cycles += 5;
break;
case 0x7b: /* MOV A, E */
ctx->a = ctx->e;