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Allow GBS files with loading addresses 0x6E-0x3FF, fixes #376

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This commit is contained in:
Lior Halphon 2021-04-19 00:08:21 +03:00
parent d9b9385eb4
commit 5f2e893828
1 changed files with 11 additions and 9 deletions
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20
Core/gb.c
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@ -302,6 +302,8 @@ int GB_load_rom(GB_gameboy_t *gb, const char *path)
return 0;
}
#define GBS_ENTRY 0x61
void GB_gbs_switch_track(GB_gameboy_t *gb, uint8_t track)
{
GB_reset(gb);
@ -324,7 +326,7 @@ void GB_gbs_switch_track(GB_gameboy_t *gb, uint8_t track)
gb->cgb_double_speed = true; // Might mean double speed mode on a DMG
}
gb->sp = LE16(gb->gbs_header.sp);
gb->pc = 0x100;
gb->pc = GBS_ENTRY;
gb->boot_rom_finished = true;
gb->a = track;
if (gb->sgb) {
@ -342,7 +344,7 @@ int GB_load_gbs(GB_gameboy_t *gb, const char *path, GB_gbs_info_t *info)
}
fread(&gb->gbs_header, sizeof(gb->gbs_header), 1, f);
if (gb->gbs_header.magic != BE32('GBS\x01') ||
LE16(gb->gbs_header.load_address) < 0x400 ||
LE16(gb->gbs_header.load_address) < 0x6e ||
LE16(gb->gbs_header.load_address) >= 0x8000) {
GB_log(gb, "Not a valid GBS file: %s.\n", strerror(errno));
fclose(f);
@ -393,20 +395,20 @@ int GB_load_gbs(GB_gameboy_t *gb, const char *path, GB_gbs_info_t *info)
}
// Generate entry
memcpy(gb->rom + 0x100, (uint8_t[]) {
memcpy(gb->rom + GBS_ENTRY, (uint8_t[]) {
0xCD, // Call $XXXX
LE16(gb->gbs_header.init_address),
LE16(gb->gbs_header.init_address) >> 8,
LE16(gb->gbs_header.init_address),
LE16(gb->gbs_header.init_address) >> 8,
0x76, // HALT
0x00, // NOP
0xAF, // XOR a
0xE0, // LDH [$FFXX], a
GB_IO_IF,
GB_IO_IF,
0xCD, // Call $XXXX
LE16(gb->gbs_header.play_address),
LE16(gb->gbs_header.play_address) >> 8,
LE16(gb->gbs_header.play_address),
LE16(gb->gbs_header.play_address) >> 8,
0x18, // JR pc ± $XX
-10 // To HALT
-10 // To HALT
}, 13);
GB_gbs_switch_track(gb, gb->gbs_header.first_track - 1);