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gbcpu.c
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gbcpu.c
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/*
* gbsplay is a Gameboy sound player
*
* 2003-2021 (C) by Tobias Diedrich <[email protected]>
* Christian Garbs <[email protected]>
*
* Licensed under GNU GPL v1 or, at your option, any later version.
*/
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/param.h>
#include <unistd.h>
#include <string.h>
#include <assert.h>
#include "gbcpu.h"
#if DEBUG == 1
static const char regnames[12] = "BCDEHLFASPPC";
static const char *regnamech16[6] = {
"BC", "DE", "HL", "AF", "SP", "PC"
};
static const char *conds[4] = {
"NZ", "Z", "NC", "C"
};
#endif
struct opinfo;
typedef void (*ex_fn)(struct gbcpu* const gbcpu, uint32_t op, const struct opinfo *oi);
struct opinfo {
#if DEBUG == 1 || defined(S_SPLINT_S)
const char* const name;
#endif
const ex_fn fn;
#if DEBUG == 1
const char cycles_1;
const char cycles_2;
#endif
};
static uint32_t none_get(void *priv, uint32_t addr)
{
UNUSED(priv);
UNUSED(addr);
return 0xff;
}
static void none_put(void *priv, uint32_t addr, uint8_t val)
{
UNUSED(priv);
UNUSED(addr);
UNUSED(val);
}
void gbcpu_init_struct(struct gbcpu* const gbcpu) {
for (uint16_t i = 0; i < GBCPU_LOOKUP_SIZE; i++) {
gbcpu->getlookup[i].get = &none_get;
gbcpu->putlookup[i].put = &none_put;
}
}
static inline uint32_t mem_get(struct gbcpu* const gbcpu, uint32_t addr)
{
struct get_entry *e = &gbcpu->getlookup[(addr >> 8) & 0xff];
gbcpu->cycles += 4;
return e->get(e->priv, addr);
}
static inline void mem_put(struct gbcpu* const gbcpu, uint32_t addr, uint32_t val)
{
struct put_entry *e = &gbcpu->putlookup[(addr >> 8) & 0xff];
gbcpu->cycles += 4;
e->put(e->priv, addr, val);
}
uint8_t gbcpu_mem_get(struct gbcpu* const gbcpu, uint16_t addr)
{
return mem_get(gbcpu, addr);
}
void gbcpu_mem_put(struct gbcpu* const gbcpu, uint16_t addr, uint8_t val)
{
mem_put(gbcpu, addr, val);
}
static void push(struct gbcpu* const gbcpu, uint32_t val)
{
uint32_t sp = REGS16_R(gbcpu->regs, SP) - 2;
REGS16_W(gbcpu->regs, SP, sp);
mem_put(gbcpu, sp, val & 0xff);
mem_put(gbcpu, sp+1, val >> 8);
}
static uint32_t pop(struct gbcpu* const gbcpu)
{
uint32_t res;
uint32_t sp = REGS16_R(gbcpu->regs, SP);
res = mem_get(gbcpu, sp);
res += mem_get(gbcpu, sp+1) << 8;
REGS16_W(gbcpu->regs, SP, sp + 2);
return res;
}
static uint32_t get_imm8(struct gbcpu* const gbcpu)
{
uint32_t pc = REGS16_R(gbcpu->regs, PC);
uint32_t res;
REGS16_W(gbcpu->regs, PC, pc + 1);
res = mem_get(gbcpu, pc);
DPRINTF("%02x", res);
return res;
}
static uint32_t get_imm16(struct gbcpu* const gbcpu)
{
uint32_t pc = REGS16_R(gbcpu->regs, PC);
uint32_t res;
REGS16_W(gbcpu->regs, PC, pc + 2);
res = mem_get(gbcpu, pc) + (mem_get(gbcpu, pc+1) << 8);
DPRINTF("%02x%02x", res & 0xFF, res >> 8);
return res;
}
static inline void print_reg(long i)
{
if (i == 6) DPRINTF("[HL]"); /* indirect memory access by [HL] */
else DPRINTF("%c", regnames[i]);
}
static uint32_t get_reg(struct gbcpu* const gbcpu, long i)
{
if (i == 6) /* indirect memory access by [HL] */
return mem_get(gbcpu, REGS16_R(gbcpu->regs, HL));
return REGS8_R(gbcpu->regs, i);
}
static void put_reg(struct gbcpu* const gbcpu, long i, uint32_t val)
{
if (i == 6) /* indirect memory access by [HL] */
mem_put(gbcpu, REGS16_R(gbcpu->regs, HL), val);
else REGS8_W(gbcpu->regs, i, val);
}
static void op_unknown(struct gbcpu* const gbcpu, uint32_t op, const struct opinfo *oi)
{
UNUSED(oi);
fprintf(stderr, "\n\nUnknown opcode %02x.\n", (unsigned char)op);
gbcpu->stopped = 1;
}
static void op_set(struct gbcpu* const gbcpu, uint32_t op)
{
long reg = op & 7;
unsigned long bit = (op >> 3) & 7;
DPRINTF("\tSET %ld, ", bit);
print_reg(reg);
put_reg(gbcpu, reg, get_reg(gbcpu, reg) | (1 << bit));
}
static void op_res(struct gbcpu* const gbcpu, uint32_t op)
{
long reg = op & 7;
unsigned long bit = (op >> 3) & 7;
DPRINTF("\tRES %ld, ", bit);
print_reg(reg);
put_reg(gbcpu, reg, get_reg(gbcpu, reg) & ~(1 << bit));
}
static void op_bit(struct gbcpu* const gbcpu, uint32_t op)
{
long reg = op & 7;
unsigned long bit = (op >> 3) & 7;
DPRINTF("\tBIT %ld, ", bit);
print_reg(reg);
gbcpu->regs.rn.f &= ~NF;
gbcpu->regs.rn.f |= HF | ZF;
gbcpu->regs.rn.f ^= ((get_reg(gbcpu, reg) << 8) >> (bit+1)) & ZF;
}
static void op_rl(struct gbcpu* const gbcpu, uint32_t op, const struct opinfo *oi)
{
/* C <- rrrrrrrr <-
* | |
* --------------
*/
long reg = op & 7;
uint8_t res, val;
UNUSED(oi);
DPRINTF(" \t%s ", oi->name);
print_reg(reg);
res = val = get_reg(gbcpu, reg);
res = res << 1;
res |= (gbcpu->regs.rn.f & CF) >> 4;
gbcpu->regs.rn.f = (val >> 7) << 4;
if (res == 0) gbcpu->regs.rn.f |= ZF;
put_reg(gbcpu, reg, res);
}
static void op_rla(struct gbcpu* const gbcpu, uint32_t op, const struct opinfo *oi)
{
/* C <- aaaaaaaa <-
* | |
* --------------
*/
uint8_t res;
UNUSED(op);
UNUSED(oi);
DPRINTF(" \t%s", oi->name);
res = gbcpu->regs.rn.a;
res = res << 1;
res |= (gbcpu->regs.rn.f & CF) >> 4;
gbcpu->regs.rn.f = (gbcpu->regs.rn.a >> 7) << 4;
gbcpu->regs.rn.a = res;
}
static void op_rlc(struct gbcpu* const gbcpu, uint32_t op, const struct opinfo *oi)
{
/* C <- rrrrrrrr <-
* | |
* -----------
*/
long reg = op & 7;
uint8_t res, val;
UNUSED(oi);
DPRINTF(" \t%s ", oi->name);
print_reg(reg);
res = val = get_reg(gbcpu, reg);
res = res << 1;
res |= val >> 7;
gbcpu->regs.rn.f = (val >> 7) << 4;
if (res == 0) gbcpu->regs.rn.f |= ZF;
put_reg(gbcpu, reg, res);
}
static void op_rlca(struct gbcpu* const gbcpu, uint32_t op, const struct opinfo *oi)
{
/* C <- aaaaaaaa <-
* | |
* -----------
*/
uint8_t res;
UNUSED(op);
UNUSED(oi);
DPRINTF(" \t%s", oi->name);
res = gbcpu->regs.rn.a;
res = res << 1;
res |= gbcpu->regs.rn.a >> 7;
gbcpu->regs.rn.f = (gbcpu->regs.rn.a >> 7) << 4;
gbcpu->regs.rn.a = res;
}
static void op_sla(struct gbcpu* const gbcpu, uint32_t op, const struct opinfo *oi)
{
long reg = op & 7;
uint8_t res, val;
UNUSED(oi);
DPRINTF(" \t%s ", oi->name);
print_reg(reg);
res = val = get_reg(gbcpu, reg);
res = res << 1;
gbcpu->regs.rn.f = (val >> 7) << 4;
if (res == 0) gbcpu->regs.rn.f |= ZF;
put_reg(gbcpu, reg, res);
}
static void op_rr(struct gbcpu* const gbcpu, uint32_t op, const struct opinfo *oi)
{
long reg = op & 7;
uint8_t res, val;
UNUSED(oi);
DPRINTF(" \t%s ", oi->name);
print_reg(reg);
res = val = get_reg(gbcpu, reg);
res = res >> 1;
res |= (gbcpu->regs.rn.f & CF) << 3;
gbcpu->regs.rn.f = (val & 1) << 4;
if (res == 0) gbcpu->regs.rn.f |= ZF;
put_reg(gbcpu, reg, res);
}
static void op_rra(struct gbcpu* const gbcpu, uint32_t op, const struct opinfo *oi)
{
uint8_t res;
UNUSED(op);
UNUSED(oi);
DPRINTF(" \t%s", oi->name);
res = gbcpu->regs.rn.a;
res = res >> 1;
res |= (gbcpu->regs.rn.f & CF) << 3;
gbcpu->regs.rn.f = (gbcpu->regs.rn.a & 1) << 4;
gbcpu->regs.rn.a = res;
}
static void op_rrc(struct gbcpu* const gbcpu, uint32_t op, const struct opinfo *oi)
{
long reg = op & 7;
uint8_t res, val;
UNUSED(oi);
DPRINTF(" \t%s ", oi->name);
print_reg(reg);
res = val = get_reg(gbcpu, reg);
res = res >> 1;
res |= val << 7;
gbcpu->regs.rn.f = (val & 1) << 4;
if (res == 0) gbcpu->regs.rn.f |= ZF;
put_reg(gbcpu, reg, res);
}
static void op_rrca(struct gbcpu* const gbcpu, uint32_t op, const struct opinfo *oi)
{
uint8_t res;
UNUSED(op);
UNUSED(oi);
DPRINTF(" \t%s", oi->name);
res = gbcpu->regs.rn.a;
res = res >> 1;
res |= gbcpu->regs.rn.a << 7;
gbcpu->regs.rn.f = (gbcpu->regs.rn.a & 1) << 4;
gbcpu->regs.rn.a = res;
}
static void op_sra(struct gbcpu* const gbcpu, uint32_t op, const struct opinfo *oi)
{
long reg = op & 7;
uint8_t res, val;
UNUSED(oi);
DPRINTF(" \t%s ", oi->name);
print_reg(reg);
res = val = get_reg(gbcpu, reg);
res = res >> 1;
res |= val & 0x80;
gbcpu->regs.rn.f = (val & 1) << 4;
if (res == 0) gbcpu->regs.rn.f |= ZF;
put_reg(gbcpu, reg, res);
}
static void op_srl(struct gbcpu* const gbcpu, uint32_t op, const struct opinfo *oi)
{
long reg = op & 7;
uint8_t res, val;
UNUSED(oi);
DPRINTF(" \t%s ", oi->name);
print_reg(reg);
res = val = get_reg(gbcpu, reg);
res = res >> 1;
gbcpu->regs.rn.f = (val & 1) << 4;
if (res == 0) gbcpu->regs.rn.f |= ZF;
put_reg(gbcpu, reg, res);
}
static void op_swap(struct gbcpu* const gbcpu, uint32_t op, const struct opinfo *oi)
{
long reg = op & 7;
uint32_t res;
uint32_t val;
UNUSED(oi);
DPRINTF(" \t%s ", oi->name);
print_reg(reg);
val = get_reg(gbcpu, reg);
res = (val >> 4) |
(val << 4);
gbcpu->regs.rn.f = 0;
if (res == 0) gbcpu->regs.rn.f |= ZF;
put_reg(gbcpu, reg, res);
}
static const struct opinfo cbops[8] = {
OPINFO("RLC", &op_rlc, 0, 0), /* opcode cb00-cb07 */
OPINFO("RRC", &op_rrc, 0, 0), /* opcode cb08-cb0f */
OPINFO("RL", &op_rl, 0, 0), /* opcode cb10-cb17 */
OPINFO("RR", &op_rr, 0, 0), /* opcode cb18-cb1f */
OPINFO("SLA", &op_sla, 0, 0), /* opcode cb20-cb27 */
OPINFO("SRA", &op_sra, 0, 0), /* opcode cb28-cb2f */
OPINFO("SWAP", &op_swap, 0, 0), /* opcode cb30-cb37 */
OPINFO("SRL", &op_srl, 0, 0), /* opcode cb38-cb3f */
};
static void op_cbprefix(struct gbcpu* const gbcpu, uint32_t op, const struct opinfo *oi)
{
uint16_t pc = REGS16_R(gbcpu->regs, PC);
UNUSED(oi);
REGS16_W(gbcpu->regs, PC, pc + 1);
op = mem_get(gbcpu, pc);
DPRINTF("%02x", op);
switch (op >> 6) {
case 0: cbops[(op >> 3) & 7].fn(gbcpu, op, &cbops[(op >> 3) & 7]);
return;
case 1: op_bit(gbcpu, op); return;
case 2: op_res(gbcpu, op); return;
case 3: op_set(gbcpu, op); return;
}
fprintf(stderr, "\n\nUnknown CB subopcode %02x.\n", (unsigned char)op);
gbcpu->stopped = 1;
}
static void op_ld(struct gbcpu* const gbcpu, uint32_t op, const struct opinfo *oi)
{
long src = op & 7;
long dst = (op >> 3) & 7;
UNUSED(oi);
DPRINTF(" \t%s ", oi->name);
print_reg(dst);
DPRINTF(", ");
print_reg(src);
put_reg(gbcpu, dst, get_reg(gbcpu, src));
}
static void op_ld_imm(struct gbcpu* const gbcpu, uint32_t op, const struct opinfo *oi)
{
long ofs = get_imm16(gbcpu);
UNUSED(op);
UNUSED(oi);
DPRINTF(" \t%s A, [0x%04lx]", oi->name, ofs);
gbcpu->regs.rn.a = mem_get(gbcpu, ofs);
}
static void op_ld_ind16_a(struct gbcpu* const gbcpu, uint32_t op, const struct opinfo *oi)
{
long ofs = get_imm16(gbcpu);
UNUSED(op);
UNUSED(oi);
DPRINTF(" \t%s [0x%04lx], A", oi->name, ofs);
mem_put(gbcpu, ofs, gbcpu->regs.rn.a);
}
static void op_ld_ind16_sp(struct gbcpu* const gbcpu, uint32_t op, const struct opinfo *oi)
{
long ofs = get_imm16(gbcpu);
long sp = REGS16_R(gbcpu->regs, SP);
UNUSED(op);
UNUSED(oi);
DPRINTF(" \t%s [0x%04lx], SP", oi->name, ofs);
mem_put(gbcpu, ofs, sp & 0xff);
mem_put(gbcpu, ofs+1, sp >> 8);
}
static void op_ld_hlsp(struct gbcpu* const gbcpu, uint32_t op, const struct opinfo *oi)
{
int8_t ofs = get_imm8(gbcpu);
uint16_t old = REGS16_R(gbcpu->regs, SP);
uint16_t new = old + ofs;
UNUSED(op);
UNUSED(oi);
if (ofs>0) DPRINTF(" \t%s HL, SP+0x%02x", oi->name, ofs);
else DPRINTF(" \t%s HL, SP-0x%02x", oi->name, -ofs);
REGS16_W(gbcpu->regs, HL, new);
gbcpu->regs.rn.f = 0;
/* flags are based on LOW-BYTE */
if ((old & 0xff) > (new & 0xff)) gbcpu->regs.rn.f |= CF;
if ((old & 0xf) > (new & 0xf)) gbcpu->regs.rn.f |= HF;
// 4 extra cycles.
gbcpu->cycles += 4;
}
static void op_ld_sphl(struct gbcpu* const gbcpu, uint32_t op, const struct opinfo *oi)
{
UNUSED(op);
UNUSED(oi);
DPRINTF(" \t%s SP, HL", oi->name);
REGS16_W(gbcpu->regs, SP, REGS16_R(gbcpu->regs, HL));
// 4 extra cycles.
gbcpu->cycles += 4;
}
static void op_ld_reg16_imm(struct gbcpu* const gbcpu, uint32_t op, const struct opinfo *oi)
{
long val = get_imm16(gbcpu);
long reg = (op >> 4) & 3;
UNUSED(oi);
reg += reg > 2; /* skip over AF */
DPRINTF(" \t%s %s, 0x%04lx", oi->name, regnamech16[reg], val);
REGS16_W(gbcpu->regs, reg, val);
}
static void op_ld_reg16_a(struct gbcpu* const gbcpu, uint32_t op, const struct opinfo *oi)
{
long reg = (op >> 4) & 3;
uint16_t r;
UNUSED(oi);
reg -= reg > 2; /* for HL LDD LDI opcodes */
if (op & 8) {
DPRINTF(" \t%s A, [%s]", oi->name, regnamech16[reg]);
gbcpu->regs.rn.a = mem_get(gbcpu, r = REGS16_R(gbcpu->regs, reg));
} else {
DPRINTF(" \t%s [%s], A", oi->name, regnamech16[reg]);
mem_put(gbcpu, r = REGS16_R(gbcpu->regs, reg), gbcpu->regs.rn.a);
}
if (reg == 2) {
r += (((op & 0x10) == 0) << 1)-1;
REGS16_W(gbcpu->regs, reg, r);
}
}
static void op_ld_reg8_imm(struct gbcpu* const gbcpu, uint32_t op, const struct opinfo *oi)
{
long val = get_imm8(gbcpu);
long reg = (op >> 3) & 7;
UNUSED(oi);
DPRINTF(" \t%s ", oi->name);
print_reg(reg);
put_reg(gbcpu, reg, val);
DPRINTF(", 0x%02lx", val);
}
static void op_ldh(struct gbcpu* const gbcpu, uint32_t op, const struct opinfo *oi)
{
long ofs = op & 2 ? 0 : get_imm8(gbcpu);
UNUSED(oi);
if (op & 0x10) {
DPRINTF(" \t%s A, ", oi->name);
if ((op & 2) == 0) {
DPRINTF("[%02lx]", ofs);
} else {
ofs = gbcpu->regs.rn.c;
DPRINTF("[C]");
}
gbcpu->regs.rn.a = mem_get(gbcpu, 0xff00 + ofs);
} else {
if ((op & 2) == 0) {
DPRINTF(" \t%s [%02lx], A", oi->name, ofs);
} else {
ofs = gbcpu->regs.rn.c;
DPRINTF(" \t%s [C], A", oi->name);
}
mem_put(gbcpu, 0xff00 + ofs, gbcpu->regs.rn.a);
}
}
static void op_inc(struct gbcpu* const gbcpu, uint32_t op, const struct opinfo *oi)
{
long reg = (op >> 3) & 7;
uint8_t res;
uint8_t old;
UNUSED(oi);
DPRINTF(" \t%s ", oi->name);
print_reg(reg);
old = res = get_reg(gbcpu, reg);
res++;
put_reg(gbcpu, reg, res);
gbcpu->regs.rn.f &= ~(NF | ZF | HF);
if (res == 0) gbcpu->regs.rn.f |= ZF;
if ((old & 15) > (res & 15)) gbcpu->regs.rn.f |= HF;
}
static void op_inc16(struct gbcpu* const gbcpu, uint32_t op, const struct opinfo *oi)
{
long reg = (op >> 4) & 3;
uint16_t res;
UNUSED(oi);
reg += reg > 2; /* skip over AF */
res = REGS16_R(gbcpu->regs, reg);
DPRINTF(" \t%s %s\t", oi->name, regnamech16[reg]);
res++;
REGS16_W(gbcpu->regs, reg, res);
// 16bit ALU op takes 4 extra cycles.
gbcpu->cycles += 4;
}
static void op_dec(struct gbcpu* const gbcpu, uint32_t op, const struct opinfo *oi)
{
long reg = (op >> 3) & 7;
uint8_t res;
uint8_t old;
UNUSED(oi);
DPRINTF(" \t%s ", oi->name);
print_reg(reg);
old = res = get_reg(gbcpu, reg);
res--;
put_reg(gbcpu, reg, res);
gbcpu->regs.rn.f |= NF;
gbcpu->regs.rn.f &= ~(ZF | HF);
if (res == 0) gbcpu->regs.rn.f |= ZF;
if ((old & 15) < (res & 15)) gbcpu->regs.rn.f |= HF;
}
static void op_dec16(struct gbcpu* const gbcpu, uint32_t op, const struct opinfo *oi)
{
long reg = (op >> 4) & 3;
uint16_t res;
UNUSED(oi);
reg += reg > 2; /* skip over AF */
res = REGS16_R(gbcpu->regs, reg);
DPRINTF(" \t%s %s", oi->name, regnamech16[reg]);
res--;
REGS16_W(gbcpu->regs, reg, res);
// 16bit ALU op takes 4 extra cycles.
gbcpu->cycles += 4;
}
static void op_add_sp_imm(struct gbcpu* const gbcpu, uint32_t op, const struct opinfo *oi)
{
int8_t imm = get_imm8(gbcpu);
uint16_t old = REGS16_R(gbcpu->regs, SP);
uint16_t new = old;
UNUSED(op);
UNUSED(oi);
DPRINTF(" \t%s SP, %02x", oi->name, imm);
new += imm;
REGS16_W(gbcpu->regs, SP, new);
gbcpu->regs.rn.f = 0;
/* flags are based on LOW-BYTE */
if ((old & 0xff) > (new & 0xff)) gbcpu->regs.rn.f |= CF;
if ((old & 0xf) > (new & 0xf)) gbcpu->regs.rn.f |= HF;
// 8 extra cycles.
gbcpu->cycles += 8;
}
static void op_add(struct gbcpu* const gbcpu, uint32_t op, const struct opinfo *oi)
{
uint8_t old = gbcpu->regs.rn.a;
uint8_t new;
UNUSED(oi);
DPRINTF(" \t%s A, ", oi->name);
print_reg(op & 7);
gbcpu->regs.rn.a += get_reg(gbcpu, op & 7);
new = gbcpu->regs.rn.a;
gbcpu->regs.rn.f = 0;
if (old > new) gbcpu->regs.rn.f |= CF;
if ((old & 15) > (new & 15)) gbcpu->regs.rn.f |= HF;
if (new == 0) gbcpu->regs.rn.f |= ZF;
}
static void op_add_imm(struct gbcpu* const gbcpu, uint32_t op, const struct opinfo *oi)
{
uint8_t imm = get_imm8(gbcpu);
uint8_t old = gbcpu->regs.rn.a;
uint8_t new = old;
UNUSED(op);
UNUSED(oi);
DPRINTF(" \t%s A, $0x%02x", oi->name, imm);
new += imm;
gbcpu->regs.rn.a = new;
gbcpu->regs.rn.f = 0;
if (old > new) gbcpu->regs.rn.f |= CF;
if ((old & 15) > (new & 15)) gbcpu->regs.rn.f |= HF;
if (new == 0) gbcpu->regs.rn.f |= ZF;
}
static void op_add_hl(struct gbcpu* const gbcpu, uint32_t op, const struct opinfo *oi)
{
long reg = (op >> 4) & 3;
uint16_t old = REGS16_R(gbcpu->regs, HL);
uint16_t new = old;
UNUSED(oi);
reg += reg > 2; /* skip over AF */
DPRINTF(" \t%s HL, %s", oi->name, regnamech16[reg]);
new += REGS16_R(gbcpu->regs, reg);
REGS16_W(gbcpu->regs, HL, new);
gbcpu->regs.rn.f &= ~(NF | CF | HF);
if (old > new) gbcpu->regs.rn.f |= CF;
if ((old & 0xfff) > (new & 0xfff)) gbcpu->regs.rn.f |= HF;
// 4 extra cycles.
gbcpu->cycles += 4;
}
static void op_adc(struct gbcpu* const gbcpu, uint32_t op, const struct opinfo *oi)
{
uint8_t reg = get_reg(gbcpu, op & 7);
uint8_t old = gbcpu->regs.rn.a;
long new = old;
long c = (gbcpu->regs.rn.f & CF) > 0;
UNUSED(oi);
DPRINTF(" \t%s A, ", oi->name);
print_reg(op & 7);
new += reg;
new += c;
gbcpu->regs.rn.f = 0;
gbcpu->regs.rn.a = new;
if (new > 0xff) gbcpu->regs.rn.f |= CF;
if ((old & 15) + (reg & 15) + c > 15) gbcpu->regs.rn.f |= HF;
if (gbcpu->regs.rn.a == 0) gbcpu->regs.rn.f |= ZF;
}
static void op_adc_imm(struct gbcpu* const gbcpu, uint32_t op, const struct opinfo *oi)
{
uint8_t imm = get_imm8(gbcpu);
uint8_t old = gbcpu->regs.rn.a;
long new = old;
long c = (gbcpu->regs.rn.f & CF) > 0;
UNUSED(op);
UNUSED(oi);
DPRINTF(" \t%s A, $0x%02x", oi->name, imm);
new += imm;
new += c;
gbcpu->regs.rn.f = 0;
gbcpu->regs.rn.a = new;
if (new > 0xff) gbcpu->regs.rn.f |= CF;
if ((old & 15) + (imm & 15) + c > 15) gbcpu->regs.rn.f |= HF;
if (gbcpu->regs.rn.a == 0) gbcpu->regs.rn.f |= ZF;
}
static void op_cp(struct gbcpu* const gbcpu, uint32_t op, const struct opinfo *oi)
{
uint8_t old = gbcpu->regs.rn.a;
uint8_t new = old;
UNUSED(oi);
DPRINTF(" \t%s A, ", oi->name);
print_reg(op & 7);
new -= get_reg(gbcpu, op & 7);
gbcpu->regs.rn.f = NF;
if (old < new) gbcpu->regs.rn.f |= CF;
if ((old & 15) < (new & 15)) gbcpu->regs.rn.f |= HF;
if (new == 0) gbcpu->regs.rn.f |= ZF;
}
static void op_cp_imm(struct gbcpu* const gbcpu, uint32_t op, const struct opinfo *oi)
{
uint8_t imm = get_imm8(gbcpu);
uint8_t old = gbcpu->regs.rn.a;
uint8_t new = old;
UNUSED(op);
UNUSED(oi);
DPRINTF(" \t%s A, $0x%02x", oi->name, imm);
new -= imm;
gbcpu->regs.rn.f = NF;
if (old < new) gbcpu->regs.rn.f |= CF;
if ((old & 15) < (new & 15)) gbcpu->regs.rn.f |= HF;
if (new == 0) gbcpu->regs.rn.f |= ZF;
}
static void op_sub(struct gbcpu* const gbcpu, uint32_t op, const struct opinfo *oi)
{
uint8_t old = gbcpu->regs.rn.a;
uint8_t new;
UNUSED(oi);
DPRINTF(" \t%s A, ", oi->name);
print_reg(op & 7);
gbcpu->regs.rn.a -= get_reg(gbcpu, op & 7);
new = gbcpu->regs.rn.a;
gbcpu->regs.rn.f = NF;
if (old < new) gbcpu->regs.rn.f |= CF;
if ((old & 15) < (new & 15)) gbcpu->regs.rn.f |= HF;
if (new == 0) gbcpu->regs.rn.f |= ZF;
}
static void op_sub_imm(struct gbcpu* const gbcpu, uint32_t op, const struct opinfo *oi)
{
uint8_t imm = get_imm8(gbcpu);
uint8_t old = gbcpu->regs.rn.a;
uint8_t new = old;
UNUSED(op);
UNUSED(oi);
DPRINTF(" \t%s A, $0x%02x", oi->name, imm);
new -= imm;
gbcpu->regs.rn.a = new;
gbcpu->regs.rn.f = NF;
if (old < new) gbcpu->regs.rn.f |= CF;
if ((old & 15) < (new & 15)) gbcpu->regs.rn.f |= HF;
if (new == 0) gbcpu->regs.rn.f |= ZF;
}
static void op_sbc(struct gbcpu* const gbcpu, uint32_t op, const struct opinfo *oi)
{
uint8_t reg = get_reg(gbcpu, op & 7);
uint8_t old = gbcpu->regs.rn.a;
long new = old + 0x100;
long c = (gbcpu->regs.rn.f & CF) > 0;
UNUSED(oi);
DPRINTF(" \t%s A, ", oi->name);
print_reg(op & 7);
new -= reg;
new -= c;
gbcpu->regs.rn.a = new;
gbcpu->regs.rn.f = NF;
if (new < 0x100) gbcpu->regs.rn.f |= CF;
if ((old & 15) - (reg & 15) - c < 0) gbcpu->regs.rn.f |= HF;
if (gbcpu->regs.rn.a == 0) gbcpu->regs.rn.f |= ZF;
}
static void op_sbc_imm(struct gbcpu* const gbcpu, uint32_t op, const struct opinfo *oi)
{
uint8_t imm = get_imm8(gbcpu);
uint8_t old = gbcpu->regs.rn.a;
long new = old + 0x100;
long c = (gbcpu->regs.rn.f & CF) > 0;
UNUSED(op);
UNUSED(oi);
DPRINTF(" \t%s A, $0x%02x", oi->name, imm);
new -= imm;
new -= c;
gbcpu->regs.rn.a = new;
gbcpu->regs.rn.f = NF;
if (new < 0x100) gbcpu->regs.rn.f |= CF;
if ((old & 15) - (imm & 15) - c < 0) gbcpu->regs.rn.f |= HF;
if (gbcpu->regs.rn.a == 0) gbcpu->regs.rn.f |= ZF;
}
static void op_and(struct gbcpu* const gbcpu, uint32_t op, const struct opinfo *oi)
{
UNUSED(oi);
DPRINTF(" \t%s A, ", oi->name);
print_reg(op & 7);
gbcpu->regs.rn.a &= get_reg(gbcpu, op & 7);
gbcpu->regs.rn.f = HF;
if (gbcpu->regs.rn.a == 0) gbcpu->regs.rn.f |= ZF;
}
static void op_and_imm(struct gbcpu* const gbcpu, uint32_t op, const struct opinfo *oi)
{
uint8_t imm = get_imm8(gbcpu);
UNUSED(op);
UNUSED(oi);
DPRINTF(" \t%s A, $0x%02x", oi->name, imm);
gbcpu->regs.rn.a &= imm;
gbcpu->regs.rn.f = HF;
if (gbcpu->regs.rn.a == 0) gbcpu->regs.rn.f |= ZF;
}
static void op_or(struct gbcpu* const gbcpu, uint32_t op, const struct opinfo *oi)
{
UNUSED(oi);
DPRINTF(" \t%s A, ", oi->name);
print_reg(op & 7);
gbcpu->regs.rn.a |= get_reg(gbcpu, op & 7);
gbcpu->regs.rn.f = 0;
if (gbcpu->regs.rn.a == 0) gbcpu->regs.rn.f |= ZF;
}
static void op_or_imm(struct gbcpu* const gbcpu, uint32_t op, const struct opinfo *oi)
{
uint8_t imm = get_imm8(gbcpu);
UNUSED(op);
UNUSED(oi);
DPRINTF(" \t%s A, $0x%02x", oi->name, imm);
gbcpu->regs.rn.a |= imm;
gbcpu->regs.rn.f = 0;
if (gbcpu->regs.rn.a == 0) gbcpu->regs.rn.f |= ZF;
}
static void op_xor(struct gbcpu* const gbcpu, uint32_t op, const struct opinfo *oi)
{
UNUSED(oi);
DPRINTF(" \t%s A, ", oi->name);
print_reg(op & 7);
gbcpu->regs.rn.a ^= get_reg(gbcpu, op & 7);
gbcpu->regs.rn.f = 0;
if (gbcpu->regs.rn.a == 0) gbcpu->regs.rn.f |= ZF;
}
static void op_xor_imm(struct gbcpu* const gbcpu, uint32_t op, const struct opinfo *oi)
{
uint8_t imm = get_imm8(gbcpu);
UNUSED(op);
UNUSED(oi);
DPRINTF(" \t%s A, $0x%02x", oi->name, imm);
gbcpu->regs.rn.a ^= imm;
gbcpu->regs.rn.f = 0;
if (gbcpu->regs.rn.a == 0) gbcpu->regs.rn.f |= ZF;
}
static void op_push(struct gbcpu* const gbcpu, uint32_t op, const struct opinfo *oi)
{
long reg = op >> 4 & 3;
UNUSED(oi);
push(gbcpu, REGS16_R(gbcpu->regs, reg));
// 4 extra cycles.
gbcpu->cycles += 4;
DPRINTF(" \t%s %s\t", oi->name, regnamech16[reg]);
}
static void op_push_af(struct gbcpu* const gbcpu, uint32_t op, const struct opinfo *oi)
{
uint16_t tmp = gbcpu->regs.rn.a << 8;
UNUSED(op);
UNUSED(oi);
tmp |= gbcpu->regs.rn.f;
push(gbcpu, tmp);
// 4 extra cycles.
gbcpu->cycles += 4;
DPRINTF(" \t%s %s\t", oi->name, regnamech16[op >> 4 & 3]);
}
static void op_pop(struct gbcpu* const gbcpu, uint32_t op, const struct opinfo *oi)
{
long reg = op >> 4 & 3;
UNUSED(oi);
REGS16_W(gbcpu->regs, reg, pop(gbcpu));
DPRINTF(" \t%s %s\t", oi->name, regnamech16[reg]);
}
static void op_pop_af(struct gbcpu* const gbcpu, uint32_t op, const struct opinfo *oi)
{
uint16_t tmp = pop(gbcpu);
UNUSED(op);
UNUSED(oi);
gbcpu->regs.rn.f = tmp & 0xf0;
gbcpu->regs.rn.a = tmp >> 8;
DPRINTF(" \t%s %s\t", oi->name, regnamech16[op >> 4 & 3]);
}
static void op_cpl(struct gbcpu* const gbcpu, uint32_t op, const struct opinfo *oi)