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gb.c
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gb.c
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#include <stdio.h>
#include <stdbool.h>
#include <stdlib.h>
#include <stddef.h>
#include <string.h>
#include <errno.h>
#include <stdarg.h>
#ifndef _WIN32
#include <sys/select.h>
#include <unistd.h>
#endif
#include "random.h"
#include "gb.h"
void GB_attributed_logv(GB_gameboy_t *gb, GB_log_attributes attributes, const char *fmt, va_list args)
{
char *string = NULL;
vasprintf(&string, fmt, args);
if (string) {
if (gb->log_callback) {
gb->log_callback(gb, string, attributes);
}
else {
/* Todo: Add ANSI escape sequences for attributed text */
printf("%s", string);
}
}
free(string);
}
void GB_attributed_log(GB_gameboy_t *gb, GB_log_attributes attributes, const char *fmt, ...)
{
va_list args;
va_start(args, fmt);
GB_attributed_logv(gb, attributes, fmt, args);
va_end(args);
}
void GB_log(GB_gameboy_t *gb, const char *fmt, ...)
{
va_list args;
va_start(args, fmt);
GB_attributed_logv(gb, 0, fmt, args);
va_end(args);
}
#ifndef GB_DISABLE_DEBUGGER
static char *default_input_callback(GB_gameboy_t *gb)
{
char *expression = NULL;
size_t size = 0;
if (gb->debug_stopped) {
printf(">");
}
if (getline(&expression, &size, stdin) == -1) {
/* The user doesn't have STDIN or used ^D. We make sure the program keeps running. */
GB_set_async_input_callback(gb, NULL); /* Disable async input */
return strdup("c");
}
if (!expression) {
return strdup("");
}
size_t length = strlen(expression);
if (expression[length - 1] == '\n') {
expression[length - 1] = 0;
}
if (expression[0] == '\x03') {
GB_debugger_break(gb);
free(expression);
return strdup("");
}
return expression;
}
static char *default_async_input_callback(GB_gameboy_t *gb)
{
#ifndef _WIN32
fd_set set;
FD_ZERO(&set);
FD_SET(STDIN_FILENO, &set);
struct timeval time = {0,};
if (select(1, &set, NULL, NULL, &time) == 1) {
if (feof(stdin)) {
GB_set_async_input_callback(gb, NULL); /* Disable async input */
return NULL;
}
return default_input_callback(gb);
}
#endif
return NULL;
}
#endif
static void load_default_border(GB_gameboy_t *gb)
{
if (gb->has_sgb_border) return;
#define LOAD_BORDER() do { \
memcpy(gb->borrowed_border.map, tilemap, sizeof(tilemap));\
memcpy(gb->borrowed_border.palette, palette, sizeof(palette));\
memcpy(gb->borrowed_border.tiles, tiles, sizeof(tiles));\
} while (false);
#ifdef GB_BIG_ENDIAN
for (unsigned i = 0; i < sizeof(gb->borrowed_border.map) / 2; i++) {
gb->borrowed_border.map[i] = LE16(gb->borrowed_border.map[i]);
}
for (unsigned i = 0; i < sizeof(gb->borrowed_border.palette) / 2; i++) {
gb->borrowed_border.palette[i] = LE16(gb->borrowed_border.palette[i]);
}
#endif
if (gb->model > GB_MODEL_CGB_E) {
#include "graphics/agb_border.inc"
LOAD_BORDER();
}
else if (gb->model == GB_MODEL_MGB) {
#include "graphics/mgb_border.inc"
LOAD_BORDER();
if (gb->dmg_palette &&
gb->dmg_palette->colors[4].b > gb->dmg_palette->colors[4].r) {
for (unsigned i = 0; i < 7; i++) {
gb->borrowed_border.map[13 + 24 * 32 + i] = i + 1;
gb->borrowed_border.map[13 + 25 * 32 + i] = i + 8;
}
}
}
else if (GB_is_cgb(gb)) {
#include "graphics/cgb_border.inc"
LOAD_BORDER();
}
else {
#include "graphics/dmg_border.inc"
LOAD_BORDER();
}
}
size_t GB_allocation_size(void)
{
return sizeof(GB_gameboy_t);
}
GB_gameboy_t *GB_alloc(void)
{
GB_gameboy_t *ret = malloc(sizeof(*ret));
ret->magic = 0;
return ret;
}
GB_gameboy_t *GB_init(GB_gameboy_t *gb, GB_model_t model)
{
memset(gb, 0, sizeof(*gb));
gb->model = model;
if (GB_is_cgb(gb)) {
gb->ram = malloc(gb->ram_size = 0x1000 * 8);
gb->vram = malloc(gb->vram_size = 0x2000 * 2);
}
else {
gb->ram = malloc(gb->ram_size = 0x2000);
gb->vram = malloc(gb->vram_size = 0x2000);
}
#ifndef GB_DISABLE_DEBUGGER
gb->input_callback = default_input_callback;
gb->async_input_callback = default_async_input_callback;
#endif
gb->cartridge_type = &GB_cart_defs[0]; // Default cartridge type
gb->clock_multiplier = 1.0;
gb->apu_output.max_cycles_per_sample = 0x400;
if (model & GB_MODEL_NO_SFC_BIT) {
/* Disable time syncing. Timing should be done by the SFC emulator. */
gb->turbo = true;
}
gb->data_bus_decay = 12;
GB_reset(gb);
load_default_border(gb);
return gb;
}
GB_model_t GB_get_model(GB_gameboy_t *gb)
{
return gb->model;
}
void GB_free(GB_gameboy_t *gb)
{
GB_ASSERT_NOT_RUNNING(gb)
gb->magic = 0;
if (gb->ram) {
free(gb->ram);
}
if (gb->vram) {
free(gb->vram);
}
if (gb->mbc_ram) {
free(gb->mbc_ram);
}
if (gb->rom) {
free(gb->rom);
}
if (gb->sgb) {
free(gb->sgb);
}
#ifndef GB_DISABLE_DEBUGGER
GB_debugger_clear_symbols(gb);
if (gb->breakpoints) {
free(gb->breakpoints);
}
if (gb->watchpoints) {
free(gb->watchpoints);
}
if (gb->nontrivial_jump_state) {
free(gb->nontrivial_jump_state);
}
if (gb->undo_state) {
free(gb->undo_state);
}
#endif
GB_rewind_reset(gb);
#ifndef GB_DISABLE_CHEATS
while (gb->cheats) {
GB_remove_cheat(gb, gb->cheats[0]);
}
#endif
GB_stop_audio_recording(gb);
memset(gb, 0, sizeof(*gb));
}
void GB_dealloc(GB_gameboy_t *gb)
{
if (GB_is_inited(gb)) {
GB_free(gb);
}
free(gb);
}
int GB_load_boot_rom(GB_gameboy_t *gb, const char *path)
{
FILE *f = fopen(path, "rb");
if (!f) {
GB_log(gb, "Could not open boot ROM: %s.\n", strerror(errno));
return errno;
}
fread(gb->boot_rom, sizeof(gb->boot_rom), 1, f);
fclose(f);
return 0;
}
void GB_load_boot_rom_from_buffer(GB_gameboy_t *gb, const unsigned char *buffer, size_t size)
{
if (size > sizeof(gb->boot_rom)) {
size = sizeof(gb->boot_rom);
}
memset(gb->boot_rom, 0xFF, sizeof(gb->boot_rom));
memcpy(gb->boot_rom, buffer, size);
}
void GB_borrow_sgb_border(GB_gameboy_t *gb)
{
if (GB_is_sgb(gb)) return;
if (gb->border_mode != GB_BORDER_ALWAYS) return;
if (gb->tried_loading_sgb_border) return;
gb->tried_loading_sgb_border = true;
if (gb->rom && gb->rom[0x146] != 3) return; // Not an SGB game, nothing to borrow
if (!gb->boot_rom_load_callback) return; // Can't borrow a border without this callback
GB_gameboy_t sgb;
GB_init(&sgb, GB_MODEL_SGB);
sgb.cartridge_type = gb->cartridge_type;
sgb.rom = gb->rom;
sgb.rom_size = gb->rom_size;
sgb.turbo = true;
sgb.turbo_dont_skip = true;
// sgb.disable_rendering = true;
/* Load the boot ROM using the existing gb object */
typeof(gb->boot_rom) boot_rom_backup;
memcpy(boot_rom_backup, gb->boot_rom, sizeof(gb->boot_rom));
gb->boot_rom_load_callback(gb, GB_BOOT_ROM_SGB);
memcpy(sgb.boot_rom, gb->boot_rom, sizeof(gb->boot_rom));
memcpy(gb->boot_rom, boot_rom_backup, sizeof(gb->boot_rom));
sgb.sgb->intro_animation = -1;
for (unsigned i = 600; i--;) {
GB_run_frame(&sgb);
if (sgb.sgb->border_animation) {
gb->has_sgb_border = true;
memcpy(&gb->borrowed_border, &sgb.sgb->pending_border, sizeof(gb->borrowed_border));
gb->borrowed_border.palette[0] = sgb.sgb->effective_palettes[0];
break;
}
}
sgb.rom = NULL;
sgb.rom_size = 0;
GB_free(&sgb);
}
static size_t rounded_rom_size(size_t size)
{
size = (size + 0x3FFF) & ~0x3FFF; /* Round to bank */
/* And then round to a power of two */
while (size & (size - 1)) {
/* I promise this works. */
size |= size >> 1;
size++;
}
if (size < 0x8000) {
size = 0x8000;
}
return size;
}
int GB_load_rom(GB_gameboy_t *gb, const char *path)
{
GB_ASSERT_NOT_RUNNING_OTHER_THREAD(gb)
FILE *f = fopen(path, "rb");
if (!f) {
GB_log(gb, "Could not open ROM: %s.\n", strerror(errno));
return errno;
}
fseek(f, 0, SEEK_END);
gb->rom_size = rounded_rom_size(ftell(f));
fseek(f, 0, SEEK_SET);
if (gb->rom) {
free(gb->rom);
}
gb->rom = malloc(gb->rom_size);
memset(gb->rom, 0xFF, gb->rom_size); /* Pad with 0xFFs */
fread(gb->rom, 1, gb->rom_size, f);
fclose(f);
GB_configure_cart(gb);
gb->tried_loading_sgb_border = false;
gb->has_sgb_border = false;
load_default_border(gb);
return 0;
}
#define GBS_ENTRY 0x61
#define GBS_ENTRY_SIZE 13
static void generate_gbs_entry(GB_gameboy_t *gb, uint8_t *data)
{
memcpy(data, (uint8_t[]) {
0xCD, // Call $XXXX
LE16(gb->gbs_header.init_address),
LE16(gb->gbs_header.init_address) >> 8,
0x76, // HALT
0x00, // NOP
0xAF, // XOR a
0xE0, // LDH [$FFXX], a
GB_IO_IF,
0xCD, // Call $XXXX
LE16(gb->gbs_header.play_address),
LE16(gb->gbs_header.play_address) >> 8,
0x18, // JR pc ± $XX
-10 // To HALT
}, GBS_ENTRY_SIZE);
}
void GB_gbs_switch_track(GB_gameboy_t *gb, uint8_t track)
{
GB_reset(gb);
GB_write_memory(gb, 0xFF00 + GB_IO_LCDC, GB_LCDC_ENABLE);
GB_write_memory(gb, 0xFF00 + GB_IO_TAC, gb->gbs_header.TAC);
GB_write_memory(gb, 0xFF00 + GB_IO_TMA, gb->gbs_header.TMA);
GB_write_memory(gb, 0xFF00 + GB_IO_NR52, 0x80);
GB_write_memory(gb, 0xFF00 + GB_IO_NR51, 0xFF);
GB_write_memory(gb, 0xFF00 + GB_IO_NR50, 0x77);
memset(gb->ram, 0, gb->ram_size);
memset(gb->hram, 0, sizeof(gb->hram));
memset(gb->oam, 0, sizeof(gb->oam));
if (gb->gbs_header.TAC || gb->gbs_header.TMA) {
GB_write_memory(gb, 0xFFFF, 0x04);
}
else {
GB_write_memory(gb, 0xFFFF, 0x01);
}
if (gb->gbs_header.TAC & 0x80) {
gb->cgb_double_speed = true; // Might mean double speed mode on a DMG
}
if (gb->gbs_header.load_address) {
gb->sp = LE16(gb->gbs_header.sp);
gb->pc = GBS_ENTRY;
}
else {
gb->pc = gb->sp = LE16(gb->gbs_header.sp - GBS_ENTRY_SIZE);
uint8_t entry[GBS_ENTRY_SIZE];
generate_gbs_entry(gb, entry);
for (unsigned i = 0; i < sizeof(entry); i++) {
GB_write_memory(gb, gb->pc + i, entry[i]);
}
}
gb->boot_rom_finished = true;
gb->a = track;
if (gb->sgb) {
gb->sgb->intro_animation = GB_SGB_INTRO_ANIMATION_LENGTH;
gb->sgb->disable_commands = true;
}
if (gb->gbs_header.TAC & 0x4) {
gb->interrupt_enable = 4;
}
else {
gb->interrupt_enable = 1;
}
}
int GB_load_gbs_from_buffer(GB_gameboy_t *gb, const uint8_t *buffer, size_t size, GB_gbs_info_t *info)
{
GB_ASSERT_NOT_RUNNING_OTHER_THREAD(gb)
if (size < sizeof(gb->gbs_header)) {
GB_log(gb, "Not a valid GBS file.\n");
return -1;
}
memcpy(&gb->gbs_header, buffer, sizeof(gb->gbs_header));
if (gb->gbs_header.magic != BE32('GBS\x01') ||
((LE16(gb->gbs_header.load_address) < GBS_ENTRY + GBS_ENTRY_SIZE ||
LE16(gb->gbs_header.load_address) >= 0x8000) &&
LE16(gb->gbs_header.load_address) != 0)) {
GB_log(gb, "Not a valid GBS file.\n");
return -1;
}
size_t data_size = size - sizeof(gb->gbs_header);
gb->rom_size = rounded_rom_size(data_size + LE16(gb->gbs_header.load_address));
if (gb->rom) {
free(gb->rom);
}
gb->rom = malloc(gb->rom_size);
memset(gb->rom, 0xFF, gb->rom_size); /* Pad with 0xFFs */
memcpy(gb->rom + LE16(gb->gbs_header.load_address), buffer + sizeof(gb->gbs_header), data_size);
gb->cartridge_type = &GB_cart_defs[0x11];
if (gb->mbc_ram) {
free(gb->mbc_ram);
gb->mbc_ram = NULL;
gb->mbc_ram_size = 0;
}
if (gb->cartridge_type->has_ram) {
gb->mbc_ram_size = 0x2000;
gb->mbc_ram = malloc(gb->mbc_ram_size);
memset(gb->mbc_ram, 0xFF, gb->mbc_ram_size);
}
bool has_interrupts = gb->gbs_header.TAC & 0x40;
if (gb->gbs_header.load_address) {
// Generate interrupt handlers
for (unsigned i = 0; i <= (has_interrupts? 0x50 : 0x38); i += 8) {
gb->rom[i] = 0xC3; // jp $XXXX
gb->rom[i + 1] = (LE16(gb->gbs_header.load_address) + i);
gb->rom[i + 2] = (LE16(gb->gbs_header.load_address) + i) >> 8;
}
for (unsigned i = has_interrupts? 0x58 : 0x40; i <= 0x60; i += 8) {
gb->rom[i] = 0xC9; // ret
}
// Generate entry
generate_gbs_entry(gb, gb->rom + GBS_ENTRY);
}
GB_gbs_switch_track(gb, gb->gbs_header.first_track - 1);
if (info) {
memset(info, 0, sizeof(*info));
info->first_track = gb->gbs_header.first_track - 1;
info->track_count = gb->gbs_header.track_count;
memcpy(info->title, gb->gbs_header.title, sizeof(gb->gbs_header.title));
memcpy(info->author, gb->gbs_header.author, sizeof(gb->gbs_header.author));
memcpy(info->copyright, gb->gbs_header.copyright, sizeof(gb->gbs_header.copyright));
}
gb->tried_loading_sgb_border = true; // Don't even attempt on GBS files
gb->has_sgb_border = false;
load_default_border(gb);
return 0;
}
int GB_load_gbs(GB_gameboy_t *gb, const char *path, GB_gbs_info_t *info)
{
GB_ASSERT_NOT_RUNNING_OTHER_THREAD(gb)
FILE *f = fopen(path, "rb");
if (!f) {
GB_log(gb, "Could not open GBS: %s.\n", strerror(errno));
return errno;
}
fseek(f, 0, SEEK_END);
size_t file_size = MIN(ftell(f), sizeof(GB_gbs_header_t) + 0x4000 * 0x100); // Cap with the maximum MBC3 ROM size + GBS header
fseek(f, 0, SEEK_SET);
uint8_t *file_data = malloc(file_size);
fread(file_data, 1, file_size, f);
fclose(f);
int r = GB_load_gbs_from_buffer(gb, file_data, file_size, info);
free(file_data);
return r;
}
int GB_load_isx(GB_gameboy_t *gb, const char *path)
{
GB_ASSERT_NOT_RUNNING_OTHER_THREAD(gb)
FILE *f = fopen(path, "rb");
if (!f) {
GB_log(gb, "Could not open ISX file: %s.\n", strerror(errno));
return errno;
}
char magic[4];
#define READ(x) if (fread(&x, sizeof(x), 1, f) != 1) goto error
fread(magic, 1, sizeof(magic), f);
bool extended = *(uint32_t *)&magic == BE32('ISX ');
fseek(f, extended? 0x20 : 0, SEEK_SET);
uint8_t *old_rom = gb->rom;
uint32_t old_size = gb->rom_size;
gb->rom = NULL;
gb->rom_size = 0;
while (true) {
uint8_t record_type = 0;
if (fread(&record_type, sizeof(record_type), 1, f) != 1) break;
switch (record_type) {
case 0x01: { // Binary
uint16_t bank;
uint16_t address;
uint16_t length;
uint8_t byte;
READ(byte);
bank = byte;
if (byte >= 0x80) {
READ(byte);
/* TODO: This is just a guess, the docs don't elaborate on how banks > 0xFF are saved,
other than the fact that banks >= 80 requires two bytes to store them, and I haven't
encountered an ISX file for a ROM larger than 4MBs yet. */
bank += byte << 7;
}
READ(address);
address = LE16(address);
address &= 0x3FFF;
READ(length);
length = LE16(length);
size_t needed_size = bank * 0x4000 + address + length;
if (needed_size > 1024 * 1024 * 32) goto error;
if (gb->rom_size < needed_size) {
gb->rom = realloc(gb->rom, needed_size);
memset(gb->rom + gb->rom_size, 0, needed_size - gb->rom_size);
gb->rom_size = needed_size;
}
if (fread(gb->rom + (bank * 0x4000 + address), length, 1, f) != 1) goto error;
break;
}
case 0x11: { // Extended Binary
uint32_t address;
uint32_t length;
READ(address);
address = LE32(address);
READ(length);
length = LE32(length);
size_t needed_size = address + length;
if (needed_size > 1024 * 1024 * 32) goto error;
if (gb->rom_size < needed_size) {
gb->rom = realloc(gb->rom, needed_size);
memset(gb->rom + gb->rom_size, 0, needed_size - gb->rom_size);
gb->rom_size = needed_size;
}
if (fread(gb->rom + address, length, 1, f) != 1) goto error;
break;
}
case 0x04: { // Symbol
uint16_t count;
uint8_t length;
char name[257];
uint8_t flag;
uint8_t bank;
uint16_t address;
READ(count);
count = LE16(count);
while (count--) {
READ(length);
if (fread(name, length, 1, f) != 1) goto error;
name[length] = 0;
READ(flag); // unused
READ(bank);
READ(address);
address = LE16(address);
GB_debugger_add_symbol(gb, bank, address, name);
}
break;
}
case 0x14: { // Extended Binary
uint16_t count;
uint8_t length;
char name[257];
uint8_t flag;
uint32_t address;
READ(count);
count = LE16(count);
while (count--) {
READ(length);
if (fread(name, length + 1, 1, f) != 1) goto error;
name[length] = 0;
READ(flag); // unused
READ(address);
address = LE32(address);
// TODO: How to convert 32-bit addresses to Bank:Address? Needs to tell RAM and ROM apart
}
break;
}
default:
goto done;
}
}
done:;
#undef READ
if (gb->rom_size == 0) goto error;
size_t needed_size = (gb->rom_size + 0x3FFF) & ~0x3FFF; /* Round to bank */
/* And then round to a power of two */
while (needed_size & (needed_size - 1)) {
/* I promise this works. */
needed_size |= needed_size >> 1;
needed_size++;
}
if (needed_size < 0x8000) {
needed_size = 0x8000;
}
if (gb->rom_size < needed_size) {
gb->rom = realloc(gb->rom, needed_size);
memset(gb->rom + gb->rom_size, 0, needed_size - gb->rom_size);
gb->rom_size = needed_size;
}
GB_configure_cart(gb);
// Fix a common wrong MBC error
if (gb->rom[0x147] == 3) { // MBC1 + RAM + Battery
bool needs_fix = false;
if (gb->rom_size >= 0x21 * 0x4000) {
for (unsigned i = 0x20 * 0x4000; i < 0x21 * 0x4000; i++) {
if (gb->rom[i]) {
needs_fix = true;
break;
}
}
}
if (!needs_fix && gb->rom_size >= 0x41 * 0x4000) {
for (unsigned i = 0x40 * 0x4000; i < 0x41 * 0x4000; i++) {
if (gb->rom[i]) {
needs_fix = true;
break;
}
}
}
if (!needs_fix && gb->rom_size >= 0x61 * 0x4000) {
for (unsigned i = 0x60 * 0x4000; i < 0x61 * 0x4000; i++) {
if (gb->rom[i]) {
needs_fix = true;
break;
}
}
}
if (needs_fix) {
gb->rom[0x147] = 0x10; // MBC3 + RTC + RAM + Battery
GB_configure_cart(gb);
gb->rom[0x147] = 0x3;
GB_log(gb, "ROM claims to use MBC1 but appears to require MBC3 or 5, assuming MBC3.\n");
}
}
if (old_rom) {
free(old_rom);
}
return 0;
error:
GB_log(gb, "Invalid or unsupported ISX file.\n");
if (gb->rom) {
free(gb->rom);
gb->rom = old_rom;
gb->rom_size = old_size;
}
fclose(f);
gb->tried_loading_sgb_border = false;
gb->has_sgb_border = false;
load_default_border(gb);
return -1;
}
void GB_load_rom_from_buffer(GB_gameboy_t *gb, const uint8_t *buffer, size_t size)
{
GB_ASSERT_NOT_RUNNING_OTHER_THREAD(gb)
gb->rom_size = rounded_rom_size(size);
if (gb->rom) {
free(gb->rom);
}
gb->rom = malloc(gb->rom_size);
memset(gb->rom, 0xFF, gb->rom_size);
memcpy(gb->rom, buffer, size);
GB_configure_cart(gb);
gb->tried_loading_sgb_border = false;
gb->has_sgb_border = false;
load_default_border(gb);
}
typedef struct {
uint8_t seconds;
uint8_t padding1[3];
uint8_t minutes;
uint8_t padding2[3];
uint8_t hours;
uint8_t padding3[3];
uint8_t days;
uint8_t padding4[3];
uint8_t high;
uint8_t padding5[3];
} vba_rtc_time_t;
typedef struct __attribute__((packed)) {
uint32_t magic;
uint16_t version;
uint8_t mr4;
uint8_t reserved;
uint64_t last_rtc_second;
uint8_t rtc_data[4];
} tpp1_rtc_save_t;
typedef union {
struct __attribute__((packed)) {
GB_rtc_time_t rtc_real;
time_t last_rtc_second; /* Platform specific endianess and size */
} sameboy_legacy;
struct {
/* Used by VBA versions with 32-bit timestamp*/
vba_rtc_time_t rtc_real, rtc_latched;
uint32_t last_rtc_second; /* Always little endian */
} vba32;
struct {
/* Used by BGB and VBA versions with 64-bit timestamp*/
vba_rtc_time_t rtc_real, rtc_latched;
uint64_t last_rtc_second; /* Always little endian */
} vba64;
} rtc_save_t;
static void fill_tpp1_save_data(GB_gameboy_t *gb, tpp1_rtc_save_t *data)
{
data->magic = BE32('TPP1');
data->version = BE16(0x100);
data->mr4 = gb->tpp1_mr4;
data->reserved = 0;
data->last_rtc_second = LE64(time(NULL));
unrolled for (unsigned i = 4; i--;) {
data->rtc_data[i] = gb->rtc_real.data[i ^ 3];
}
}
int GB_save_battery_size(GB_gameboy_t *gb)
{
if (!gb->cartridge_type->has_battery) return 0; // Nothing to save.
if (gb->cartridge_type->mbc_type == GB_TPP1 && !(gb->rom[0x153] & 8)) return 0; // Nothing to save.
if (gb->mbc_ram_size == 0 && !gb->cartridge_type->has_rtc) return 0; /* Claims to have battery, but has no RAM or RTC */
if (gb->cartridge_type->mbc_type == GB_HUC3) {
return gb->mbc_ram_size + sizeof(GB_huc3_rtc_time_t);
}
if (gb->cartridge_type->mbc_type == GB_TPP1) {
return gb->mbc_ram_size + sizeof(tpp1_rtc_save_t);
}
rtc_save_t rtc_save_size;
return gb->mbc_ram_size + (gb->cartridge_type->has_rtc ? sizeof(rtc_save_size.vba64) : 0);
}
int GB_save_battery_to_buffer(GB_gameboy_t *gb, uint8_t *buffer, size_t size)
{
if (!gb->cartridge_type->has_battery) return 0; // Nothing to save.
if (gb->cartridge_type->mbc_type == GB_TPP1 && !(gb->rom[0x153] & 8)) return 0; // Nothing to save.
if (gb->mbc_ram_size == 0 && !gb->cartridge_type->has_rtc) return 0; /* Claims to have battery, but has no RAM or RTC */
if (size < GB_save_battery_size(gb)) return EIO;
memcpy(buffer, gb->mbc_ram, gb->mbc_ram_size);
if (gb->cartridge_type->mbc_type == GB_TPP1) {
buffer += gb->mbc_ram_size;
tpp1_rtc_save_t rtc_save;
fill_tpp1_save_data(gb, &rtc_save);
memcpy(buffer, &rtc_save, sizeof(rtc_save));
}
else if (gb->cartridge_type->mbc_type == GB_HUC3) {
buffer += gb->mbc_ram_size;
GB_huc3_rtc_time_t rtc_save = {
LE64(gb->last_rtc_second),
LE16(gb->huc3.minutes),
LE16(gb->huc3.days),
LE16(gb->huc3.alarm_minutes),
LE16(gb->huc3.alarm_days),
gb->huc3.alarm_enabled,
};
memcpy(buffer, &rtc_save, sizeof(rtc_save));
}
else if (gb->cartridge_type->has_rtc) {
rtc_save_t rtc_save = {{{{0,}},},};
rtc_save.vba64.rtc_real.seconds = gb->rtc_real.seconds;
rtc_save.vba64.rtc_real.minutes = gb->rtc_real.minutes;
rtc_save.vba64.rtc_real.hours = gb->rtc_real.hours;
rtc_save.vba64.rtc_real.days = gb->rtc_real.days;
rtc_save.vba64.rtc_real.high = gb->rtc_real.high;
rtc_save.vba64.rtc_latched.seconds = gb->rtc_latched.seconds;
rtc_save.vba64.rtc_latched.minutes = gb->rtc_latched.minutes;
rtc_save.vba64.rtc_latched.hours = gb->rtc_latched.hours;
rtc_save.vba64.rtc_latched.days = gb->rtc_latched.days;
rtc_save.vba64.rtc_latched.high = gb->rtc_latched.high;
rtc_save.vba64.last_rtc_second = LE64(time(NULL));
memcpy(buffer + gb->mbc_ram_size, &rtc_save.vba64, sizeof(rtc_save.vba64));
}
errno = 0;
return errno;
}
int GB_save_battery(GB_gameboy_t *gb, const char *path)
{
GB_ASSERT_NOT_RUNNING_OTHER_THREAD(gb)
if (!gb->cartridge_type->has_battery) return 0; // Nothing to save.
if (gb->cartridge_type->mbc_type == GB_TPP1 && !(gb->rom[0x153] & 8)) return 0; // Nothing to save.
if (gb->mbc_ram_size == 0 && !gb->cartridge_type->has_rtc) return 0; /* Claims to have battery, but has no RAM or RTC */
FILE *f = fopen(path, "wb");
if (!f) {
GB_log(gb, "Could not open battery save: %s.\n", strerror(errno));
return errno;
}
if (fwrite(gb->mbc_ram, 1, gb->mbc_ram_size, f) != gb->mbc_ram_size) {
fclose(f);
return EIO;
}
if (gb->cartridge_type->mbc_type == GB_TPP1) {
tpp1_rtc_save_t rtc_save;
fill_tpp1_save_data(gb, &rtc_save);
if (fwrite(&rtc_save, sizeof(rtc_save), 1, f) != 1) {
fclose(f);
return EIO;
}
}
else if (gb->cartridge_type->mbc_type == GB_HUC3) {
GB_huc3_rtc_time_t rtc_save = {
LE64(gb->last_rtc_second),
LE16(gb->huc3.minutes),
LE16(gb->huc3.days),
LE16(gb->huc3.alarm_minutes),
LE16(gb->huc3.alarm_days),
gb->huc3.alarm_enabled,
};
if (fwrite(&rtc_save, sizeof(rtc_save), 1, f) != 1) {
fclose(f);
return EIO;
}
}
else if (gb->cartridge_type->has_rtc) {
rtc_save_t rtc_save = {{{{0,}},},};
rtc_save.vba64.rtc_real.seconds = gb->rtc_real.seconds;
rtc_save.vba64.rtc_real.minutes = gb->rtc_real.minutes;
rtc_save.vba64.rtc_real.hours = gb->rtc_real.hours;
rtc_save.vba64.rtc_real.days = gb->rtc_real.days;
rtc_save.vba64.rtc_real.high = gb->rtc_real.high;
rtc_save.vba64.rtc_latched.seconds = gb->rtc_latched.seconds;
rtc_save.vba64.rtc_latched.minutes = gb->rtc_latched.minutes;
rtc_save.vba64.rtc_latched.hours = gb->rtc_latched.hours;
rtc_save.vba64.rtc_latched.days = gb->rtc_latched.days;
rtc_save.vba64.rtc_latched.high = gb->rtc_latched.high;
rtc_save.vba64.last_rtc_second = LE64(time(NULL));
if (fwrite(&rtc_save.vba64, 1, sizeof(rtc_save.vba64), f) != sizeof(rtc_save.vba64)) {
fclose(f);
return EIO;
}
}
errno = 0;
fclose(f);
return errno;
}
static void load_tpp1_save_data(GB_gameboy_t *gb, const tpp1_rtc_save_t *data)
{
gb->last_rtc_second = LE64(data->last_rtc_second);
unrolled for (unsigned i = 4; i--;) {
gb->rtc_real.data[i ^ 3] = data->rtc_data[i];
}
}
void GB_load_battery_from_buffer(GB_gameboy_t *gb, const uint8_t *buffer, size_t size)
{
GB_ASSERT_NOT_RUNNING_OTHER_THREAD(gb)
memcpy(gb->mbc_ram, buffer, MIN(gb->mbc_ram_size, size));
if (size <= gb->mbc_ram_size) {
goto reset_rtc;
}
if (gb->cartridge_type->mbc_type == GB_TPP1) {
tpp1_rtc_save_t rtc_save;
if (size - gb->mbc_ram_size < sizeof(rtc_save)) {
goto reset_rtc;
}
memcpy(&rtc_save, buffer + gb->mbc_ram_size, sizeof(rtc_save));
load_tpp1_save_data(gb, &rtc_save);
if (gb->last_rtc_second > time(NULL)) {
/* We must reset RTC here, or it will not advance. */
goto reset_rtc;
}
return;
}
if (gb->cartridge_type->mbc_type == GB_HUC3) {
GB_huc3_rtc_time_t rtc_save;
if (size - gb->mbc_ram_size < sizeof(rtc_save)) {
goto reset_rtc;
}
memcpy(&rtc_save, buffer + gb->mbc_ram_size, sizeof(rtc_save));
gb->last_rtc_second = LE64(rtc_save.last_rtc_second);
gb->huc3.minutes = LE16(rtc_save.minutes);
gb->huc3.days = LE16(rtc_save.days);
gb->huc3.alarm_minutes = LE16(rtc_save.alarm_minutes);
gb->huc3.alarm_days = LE16(rtc_save.alarm_days);
gb->huc3.alarm_enabled = rtc_save.alarm_enabled;
if (gb->last_rtc_second > time(NULL)) {
/* We must reset RTC here, or it will not advance. */
goto reset_rtc;
}
return;
}
rtc_save_t rtc_save;
memcpy(&rtc_save, buffer + gb->mbc_ram_size, MIN(sizeof(rtc_save), size));
switch (size - gb->mbc_ram_size) {
case sizeof(rtc_save.sameboy_legacy):
memcpy(&gb->rtc_real, &rtc_save.sameboy_legacy.rtc_real, sizeof(gb->rtc_real));
memcpy(&gb->rtc_latched, &rtc_save.sameboy_legacy.rtc_real, sizeof(gb->rtc_real));
gb->last_rtc_second = rtc_save.sameboy_legacy.last_rtc_second;
break;
case sizeof(rtc_save.vba32):
gb->rtc_real.seconds = rtc_save.vba32.rtc_real.seconds;
gb->rtc_real.minutes = rtc_save.vba32.rtc_real.minutes;
gb->rtc_real.hours = rtc_save.vba32.rtc_real.hours;
gb->rtc_real.days = rtc_save.vba32.rtc_real.days;
gb->rtc_real.high = rtc_save.vba32.rtc_real.high;
gb->rtc_latched.seconds = rtc_save.vba32.rtc_latched.seconds;