mirror of https://github.com/mgba-emu/mgba.git
197 lines
7.9 KiB
C
197 lines
7.9 KiB
C
/* Copyright (c) 2013-2016 Jeffrey Pfau
|
|
*
|
|
* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
|
|
#include <mgba/internal/gba/serialize.h>
|
|
|
|
#include <mgba/internal/arm/macros.h>
|
|
#include <mgba/internal/gba/io.h>
|
|
|
|
#include <mgba-util/memory.h>
|
|
#include <mgba-util/vfs.h>
|
|
|
|
#include <fcntl.h>
|
|
|
|
const uint32_t GBA_SAVESTATE_MAGIC = 0x01000000;
|
|
const uint32_t GBA_SAVESTATE_VERSION = 0x00000003;
|
|
|
|
mLOG_DEFINE_CATEGORY(GBA_STATE, "GBA Savestate", "gba.serialize");
|
|
|
|
struct GBABundledState {
|
|
struct GBASerializedState* state;
|
|
struct mStateExtdata* extdata;
|
|
};
|
|
|
|
void GBASerialize(struct GBA* gba, struct GBASerializedState* state) {
|
|
STORE_32(GBA_SAVESTATE_MAGIC + GBA_SAVESTATE_VERSION, 0, &state->versionMagic);
|
|
STORE_32(gba->biosChecksum, 0, &state->biosChecksum);
|
|
STORE_32(gba->romCrc32, 0, &state->romCrc32);
|
|
STORE_32(gba->timing.masterCycles, 0, &state->masterCycles);
|
|
|
|
if (gba->memory.rom) {
|
|
state->id = ((struct GBACartridge*) gba->memory.rom)->id;
|
|
memcpy(state->title, ((struct GBACartridge*) gba->memory.rom)->title, sizeof(state->title));
|
|
} else {
|
|
state->id = 0;
|
|
memset(state->title, 0, sizeof(state->title));
|
|
}
|
|
|
|
int i;
|
|
for (i = 0; i < 16; ++i) {
|
|
STORE_32(gba->cpu->gprs[i], i * sizeof(state->cpu.gprs[0]), state->cpu.gprs);
|
|
}
|
|
STORE_32(gba->cpu->cpsr.packed, 0, &state->cpu.cpsr.packed);
|
|
STORE_32(gba->cpu->spsr.packed, 0, &state->cpu.spsr.packed);
|
|
STORE_32(gba->cpu->cycles, 0, &state->cpu.cycles);
|
|
STORE_32(gba->cpu->nextEvent, 0, &state->cpu.nextEvent);
|
|
for (i = 0; i < 6; ++i) {
|
|
int j;
|
|
for (j = 0; j < 7; ++j) {
|
|
STORE_32(gba->cpu->bankedRegisters[i][j], (i * 7 + j) * sizeof(gba->cpu->bankedRegisters[0][0]), state->cpu.bankedRegisters);
|
|
}
|
|
STORE_32(gba->cpu->bankedSPSRs[i], i * sizeof(gba->cpu->bankedSPSRs[0]), state->cpu.bankedSPSRs);
|
|
}
|
|
|
|
STORE_32(gba->memory.biosPrefetch, 0, &state->biosPrefetch);
|
|
STORE_32(gba->cpu->prefetch[0], 0, state->cpuPrefetch);
|
|
STORE_32(gba->cpu->prefetch[1], 4, state->cpuPrefetch);
|
|
STORE_32(gba->memory.lastPrefetchedPc, 0, &state->lastPrefetchedPc);
|
|
|
|
GBASerializedMiscFlags miscFlags = 0;
|
|
miscFlags = GBASerializedMiscFlagsSetHalted(miscFlags, gba->cpu->halted);
|
|
miscFlags = GBASerializedMiscFlagsSetPOSTFLG(miscFlags, gba->memory.io[REG_POSTFLG >> 1] & 1);
|
|
if (mTimingIsScheduled(&gba->timing, &gba->irqEvent)) {
|
|
miscFlags = GBASerializedMiscFlagsFillIrqPending(miscFlags);
|
|
STORE_32(gba->irqEvent.when - mTimingCurrentTime(&gba->timing), 0, &state->nextIrq);
|
|
}
|
|
STORE_32(miscFlags, 0, &state->miscFlags);
|
|
|
|
GBAMemorySerialize(&gba->memory, state);
|
|
GBAIOSerialize(gba, state);
|
|
GBAVideoSerialize(&gba->video, state);
|
|
GBAAudioSerialize(&gba->audio, state);
|
|
GBASavedataSerialize(&gba->memory.savedata, state);
|
|
}
|
|
|
|
bool GBADeserialize(struct GBA* gba, const struct GBASerializedState* state) {
|
|
bool error = false;
|
|
int32_t check;
|
|
uint32_t ucheck;
|
|
LOAD_32(ucheck, 0, &state->versionMagic);
|
|
if (ucheck > GBA_SAVESTATE_MAGIC + GBA_SAVESTATE_VERSION) {
|
|
mLOG(GBA_STATE, WARN, "Invalid or too new savestate: expected %08X, got %08X", GBA_SAVESTATE_MAGIC + GBA_SAVESTATE_VERSION, ucheck);
|
|
error = true;
|
|
} else if (ucheck < GBA_SAVESTATE_MAGIC) {
|
|
mLOG(GBA_STATE, WARN, "Invalid savestate: expected %08X, got %08X", GBA_SAVESTATE_MAGIC + GBA_SAVESTATE_VERSION, ucheck);
|
|
error = true;
|
|
} else if (ucheck < GBA_SAVESTATE_MAGIC + GBA_SAVESTATE_VERSION) {
|
|
mLOG(GBA_STATE, WARN, "Old savestate: expected %08X, got %08X, continuing anyway", GBA_SAVESTATE_MAGIC + GBA_SAVESTATE_VERSION, ucheck);
|
|
}
|
|
LOAD_32(ucheck, 0, &state->biosChecksum);
|
|
if (ucheck != gba->biosChecksum) {
|
|
mLOG(GBA_STATE, WARN, "Savestate created using a different version of the BIOS: expected %08X, got %08X", gba->biosChecksum, ucheck);
|
|
uint32_t pc;
|
|
LOAD_32(pc, ARM_PC * sizeof(state->cpu.gprs[0]), state->cpu.gprs);
|
|
if (pc < SIZE_BIOS && pc >= 0x20) {
|
|
error = true;
|
|
}
|
|
}
|
|
if (gba->memory.rom && (state->id != ((struct GBACartridge*) gba->memory.rom)->id || memcmp(state->title, ((struct GBACartridge*) gba->memory.rom)->title, sizeof(state->title)))) {
|
|
mLOG(GBA_STATE, WARN, "Savestate is for a different game");
|
|
error = true;
|
|
} else if (!gba->memory.rom && state->id != 0) {
|
|
mLOG(GBA_STATE, WARN, "Savestate is for a game, but no game loaded");
|
|
error = true;
|
|
}
|
|
LOAD_32(ucheck, 0, &state->romCrc32);
|
|
if (ucheck != gba->romCrc32) {
|
|
mLOG(GBA_STATE, WARN, "Savestate is for a different version of the game");
|
|
}
|
|
LOAD_32(check, 0, &state->cpu.cycles);
|
|
if (check < 0) {
|
|
mLOG(GBA_STATE, WARN, "Savestate is corrupted: CPU cycles are negative");
|
|
error = true;
|
|
}
|
|
if (check >= (int32_t) GBA_ARM7TDMI_FREQUENCY) {
|
|
mLOG(GBA_STATE, WARN, "Savestate is corrupted: CPU cycles are too high");
|
|
error = true;
|
|
}
|
|
LOAD_32(check, ARM_PC * sizeof(state->cpu.gprs[0]), state->cpu.gprs);
|
|
int region = (check >> BASE_OFFSET);
|
|
if ((region == REGION_CART0 || region == REGION_CART1 || region == REGION_CART2) && ((check - WORD_SIZE_ARM) & SIZE_CART0) >= gba->memory.romSize - WORD_SIZE_ARM) {
|
|
mLOG(GBA_STATE, WARN, "Savestate created using a differently sized version of the ROM");
|
|
error = true;
|
|
}
|
|
if (error) {
|
|
return false;
|
|
}
|
|
mTimingClear(&gba->timing);
|
|
LOAD_32(gba->timing.masterCycles, 0, &state->masterCycles);
|
|
|
|
size_t i;
|
|
for (i = 0; i < 16; ++i) {
|
|
LOAD_32(gba->cpu->gprs[i], i * sizeof(gba->cpu->gprs[0]), state->cpu.gprs);
|
|
}
|
|
LOAD_32(gba->cpu->cpsr.packed, 0, &state->cpu.cpsr.packed);
|
|
LOAD_32(gba->cpu->spsr.packed, 0, &state->cpu.spsr.packed);
|
|
LOAD_32(gba->cpu->cycles, 0, &state->cpu.cycles);
|
|
LOAD_32(gba->cpu->nextEvent, 0, &state->cpu.nextEvent);
|
|
for (i = 0; i < 6; ++i) {
|
|
int j;
|
|
for (j = 0; j < 7; ++j) {
|
|
LOAD_32(gba->cpu->bankedRegisters[i][j], (i * 7 + j) * sizeof(gba->cpu->bankedRegisters[0][0]), state->cpu.bankedRegisters);
|
|
}
|
|
LOAD_32(gba->cpu->bankedSPSRs[i], i * sizeof(gba->cpu->bankedSPSRs[0]), state->cpu.bankedSPSRs);
|
|
}
|
|
gba->cpu->privilegeMode = gba->cpu->cpsr.priv;
|
|
gba->cpu->memory.setActiveRegion(gba->cpu, gba->cpu->gprs[ARM_PC]);
|
|
if (state->biosPrefetch) {
|
|
LOAD_32(gba->memory.biosPrefetch, 0, &state->biosPrefetch);
|
|
}
|
|
LOAD_32(gba->memory.lastPrefetchedPc, 0, &state->lastPrefetchedPc);
|
|
if (gba->cpu->cpsr.t) {
|
|
gba->cpu->executionMode = MODE_THUMB;
|
|
if (state->cpuPrefetch[0] && state->cpuPrefetch[1]) {
|
|
LOAD_32(gba->cpu->prefetch[0], 0, state->cpuPrefetch);
|
|
LOAD_32(gba->cpu->prefetch[1], 4, state->cpuPrefetch);
|
|
gba->cpu->prefetch[0] &= 0xFFFF;
|
|
gba->cpu->prefetch[1] &= 0xFFFF;
|
|
} else {
|
|
// Maintain backwards compat
|
|
LOAD_16(gba->cpu->prefetch[0], (gba->cpu->gprs[ARM_PC] - WORD_SIZE_THUMB) & gba->cpu->memory.activeMask, gba->cpu->memory.activeRegion);
|
|
LOAD_16(gba->cpu->prefetch[1], (gba->cpu->gprs[ARM_PC]) & gba->cpu->memory.activeMask, gba->cpu->memory.activeRegion);
|
|
}
|
|
} else {
|
|
gba->cpu->executionMode = MODE_ARM;
|
|
if (state->cpuPrefetch[0] && state->cpuPrefetch[1]) {
|
|
LOAD_32(gba->cpu->prefetch[0], 0, state->cpuPrefetch);
|
|
LOAD_32(gba->cpu->prefetch[1], 4, state->cpuPrefetch);
|
|
} else {
|
|
// Maintain backwards compat
|
|
LOAD_32(gba->cpu->prefetch[0], (gba->cpu->gprs[ARM_PC] - WORD_SIZE_ARM) & gba->cpu->memory.activeMask, gba->cpu->memory.activeRegion);
|
|
LOAD_32(gba->cpu->prefetch[1], (gba->cpu->gprs[ARM_PC]) & gba->cpu->memory.activeMask, gba->cpu->memory.activeRegion);
|
|
}
|
|
}
|
|
GBASerializedMiscFlags miscFlags = 0;
|
|
LOAD_32(miscFlags, 0, &state->miscFlags);
|
|
gba->cpu->halted = GBASerializedMiscFlagsGetHalted(miscFlags);
|
|
gba->memory.io[REG_POSTFLG >> 1] = GBASerializedMiscFlagsGetPOSTFLG(miscFlags);
|
|
if (GBASerializedMiscFlagsIsIrqPending(miscFlags)) {
|
|
int32_t when;
|
|
LOAD_32(when, 0, &state->nextIrq);
|
|
mTimingSchedule(&gba->timing, &gba->irqEvent, when);
|
|
}
|
|
|
|
GBAVideoDeserialize(&gba->video, state);
|
|
GBAMemoryDeserialize(&gba->memory, state);
|
|
GBAIODeserialize(gba, state);
|
|
GBAAudioDeserialize(&gba->audio, state);
|
|
GBASavedataDeserialize(&gba->memory.savedata, state);
|
|
|
|
gba->timing.reroot = gba->timing.root;
|
|
gba->timing.root = NULL;
|
|
|
|
return true;
|
|
}
|