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JoshuaMK
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1 changed files with 119 additions and 93 deletions
212
loader.c
212
loader.c
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@ -1,34 +1,44 @@
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/*Credits to riidefi for hook code, cache asm, and teaching me C*/
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#define dcbst(_val) asm volatile("dcbst 0, %0" : : "r" (_val))
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#define dcbf(_val) asm volatile("dcbf 0, %0" : : "r" (_val))
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#define icbi(_val) asm volatile("icbi 0, %0" : : "r" (_val))
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#define dcbst(_val) asm volatile("dcbst 0, %0" : : "r"(_val))
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#define dcbf(_val) asm volatile("dcbf 0, %0" : : "r"(_val))
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#define icbi(_val) asm volatile("icbi 0, %0" : : "r"(_val))
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typedef unsigned int u32;
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typedef unsigned short u16;
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typedef unsigned char u8;
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typedef int BOOL;
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typedef u32 unk32;
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enum { FALSE, TRUE };
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enum { NULL };
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enum
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{
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FALSE,
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TRUE
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};
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enum
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{
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NULL
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};
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struct Info {
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struct Info
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{
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u32 allocsize;
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u32 _loaderSize;
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u32 _loaderFullSize;
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struct CodeList* _codelistPointer;
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struct CodeList *_codelistPointer;
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u32 _wiiVIHook[4];
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u32 _gcnVIHook[8];
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};
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struct CodeList {
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struct CodeList
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{
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u16 mBaseASM;
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u16 mUpperBase;
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u16 mOffsetASM;
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u16 mLowerOffset;
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};
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struct DiscInfo {
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struct DiscInfo
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{
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u8 mDiscID;
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u16 mGameCode;
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u8 mRegionCode;
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@ -43,7 +53,7 @@ struct DiscInfo {
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u32 mUnknown2[2];
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u32 mRAMSize;
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u32 mUnknown3[2];
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u32* mHeapPointer;
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u32 *mHeapPointer;
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u32 mHeapMirror;
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u32 mFstSize;
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u32 mData[(0x3110 - 0x40) / 4];
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@ -51,109 +61,125 @@ struct DiscInfo {
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};
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struct Info gInfo = {
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.allocsize = 0, //Set to ASCII HEAP in bin file after compiling if using main.py
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._loaderSize = 0, //Set to ASCII LSIZ in bin file after compiling if using main.py
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._loaderFullSize = 0, //Set to ASCII FSIZ in bin file after compiling if using main.py
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._codelistPointer = (struct CodeList*)0x800018F8,
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._wiiVIHook = {0x7CE33B78, 0x38870034,
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0x38A70038, 0x38C7004C},
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._gcnVIHook = {0x7C030034, 0x38830020,
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0x5485083C, 0x7C7F2A14,
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0xA0030000, 0x7C7D2A14,
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0x20A4003F, 0xB0030000},
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.allocsize = 0,
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._loaderSize = 0,
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._loaderFullSize = 0,
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._codelistPointer = (struct CodeList *)0x800018F8,
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._wiiVIHook = {0x7CE33B78, 0x38870034, 0x38A70038, 0x38C7004C},
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._gcnVIHook = {0x7C030034, 0x38830020, 0x5485083C, 0x7C7F2A14, 0xA0030000, 0x7C7D2A14, 0x20A4003F, 0xB0030000},
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};
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static inline void flushAddr(void* addr)
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static inline void flushAddr(void *addr)
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{
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dcbf(addr);
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icbi(addr);
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dcbf(addr);
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icbi(addr);
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}
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static inline void directWrite(u32* addr, u32 ptr) {
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addr[0] = ptr;
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flushAddr(addr);
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static inline void directWrite(u32 *addr, u32 ptr)
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{
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addr[0] = ptr;
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flushAddr(addr);
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}
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static inline void directBranchEx(void* addr, void* ptr, BOOL lk) {
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directWrite((u32*)(addr),
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((((u32)(ptr) - (u32)(addr)) & 0x3ffffff) | 0x48000000 | !!lk));
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static inline void directBranchEx(void *addr, void *ptr, BOOL link)
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{
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directWrite((u32 *)(addr), ((((u32)(ptr) - (u32)(addr)) & 0x3ffffff) | 0x48000000 | !!link));
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}
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void (*_init_registers)(void) = &gInfo; //Set to game entry address. ASCII HEAP in bin file after compiling if using main.py
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void (*_codeHandler)(void) = &gInfo; //Set to codehandler entry address. Set to 800018A8 in bin file after compiling
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void (*_init_registers)(void) = &gInfo;
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void (*_codeHandler)(void) = &gInfo;
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static inline u32* findFunction(u32* hookData, u32* start, u32 end, u32 arrayLength) {
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u32 index = 0;
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for (u32 i = 0; (u32)&start[i] < end; ++i) {
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if (start[i] == hookData[index]) index = index + 1;
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else index = 0;
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if (index >= (arrayLength - 1)) {
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if ((u32)&start[i] < &gInfo || (u32)&start[i] > (u32)&gInfo + 0x100){
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return &start[i];
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}
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}
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}
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return NULL;
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static inline u32 *findFunction(u32 *hookData, u32 *start, u32 end, u32 arrayLength)
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{
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u32 index = 0;
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for (u32 i = 0; (u32)&start[i] < end; ++i)
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{
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if (start[i] == hookData[index])
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index = index + 1;
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else
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index = 0;
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if (index >= (arrayLength - 1))
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{
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if ((u32)&start[i] < &gInfo || (u32)&start[i] > (u32)&gInfo + 0x100)
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{
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return &start[i];
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}
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}
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}
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return NULL;
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}
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void hookFunction(u32* start, u32 hookInstruction, u32 hookTo) {
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int i = 0;
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while (start[i] != hookInstruction) {
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++i;
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}
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directBranchEx((u32*)(&start[i]), (void*)(hookTo), FALSE);
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void hookFunction(u32 *start, u32 hookInstruction, u32 hookTo)
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{
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int i = 0;
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while (start[i] != hookInstruction)
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{
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++i;
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}
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directBranchEx((u32 *)(&start[i]), (void *)(hookTo), FALSE);
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}
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static inline void overwriteValue(u32* addr, u32 newValue) {
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static inline void overwriteValue(u32 *addr, u32 newValue)
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{
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addr[0] = newValue;
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flushAddr(&addr[0]);
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}
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void initMods(struct DiscInfo* baseAddress) {
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void initMods(struct DiscInfo *baseAddress)
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{
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struct Info *infoPointer = &gInfo;
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const u32 *geckoPointerInit = (u32 *)(u32)baseAddress + 0x18F8;
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u32 sizeDiff = infoPointer->_loaderFullSize - infoPointer->_loaderSize;
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const u32 *sourcePointer = (u32 *)(infoPointer);
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struct Info* infoPointer = &gInfo;
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const u32* geckoPointerInit = (u32*)(u32)baseAddress + 0x18F8;
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u32 sizeDiff = infoPointer->_loaderFullSize - infoPointer->_loaderSize;
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const u32* sourcePointer = (u32*)(infoPointer);
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if (infoPointer->_codelistPointer)
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{
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if (baseAddress->mWiiMagic)
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{
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baseAddress->mHeapPointer = (u32)baseAddress->mWiiHeap - infoPointer->allocsize;
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baseAddress->mWiiHeap = (u32)baseAddress->mHeapPointer;
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}
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else if (baseAddress->mGCNMagic)
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{
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baseAddress->mHeapPointer = (u32)baseAddress->mHeapPointer - infoPointer->allocsize;
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}
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if (infoPointer->_codelistPointer) {
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if (baseAddress->mWiiMagic) {
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baseAddress->mHeapPointer = (u32)baseAddress->mWiiHeap - infoPointer->allocsize;
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baseAddress->mWiiHeap = (u32)baseAddress->mHeapPointer;
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}
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else if(baseAddress->mGCNMagic) {
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baseAddress->mHeapPointer = (u32)baseAddress->mHeapPointer - infoPointer->allocsize;
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}
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if (infoPointer->_loaderFullSize > 0 && infoPointer->_loaderSize > 0)
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{
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while (sizeDiff > 0)
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{
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sizeDiff = sizeDiff - 4;
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baseAddress->mHeapPointer[sizeDiff / 4] = sourcePointer[sizeDiff / 4];
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}
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infoPointer->_codelistPointer->mUpperBase = ((u32)baseAddress->mHeapPointer >> 16) & 0xFFFF;
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infoPointer->_codelistPointer->mLowerOffset = (u32)(baseAddress->mHeapPointer) & 0xFFFF;
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flushAddr(&infoPointer->_codelistPointer->mUpperBase);
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flushAddr(&infoPointer->_codelistPointer->mLowerOffset);
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if (infoPointer->_loaderFullSize > 0 && infoPointer->_loaderSize > 0) {
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while (sizeDiff > 0) {
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sizeDiff = sizeDiff - 4;
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baseAddress->mHeapPointer[sizeDiff / 4] = sourcePointer[sizeDiff / 4];
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}
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infoPointer->_codelistPointer->mUpperBase = ((u32)baseAddress->mHeapPointer >> 16) & 0xFFFF;
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infoPointer->_codelistPointer->mLowerOffset = (u32)(baseAddress->mHeapPointer) & 0xFFFF;
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flushAddr(&infoPointer->_codelistPointer->mUpperBase);
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flushAddr(&infoPointer->_codelistPointer->mLowerOffset);
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u32* functionAddr;
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if (baseAddress->mWiiMagic) {
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functionAddr = findFunction((u32*)infoPointer->_wiiVIHook, (u32*)baseAddress, 0x817FFF00, 0x4);
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}
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else {
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functionAddr = findFunction((u32*)infoPointer->_gcnVIHook, (u32*)baseAddress, 0x817FFF00, 0x8);
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}
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if (functionAddr) {
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hookFunction(functionAddr, 0x4E800020, 0x800018A8);
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}
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}
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}
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}
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int main() {
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struct DiscInfo* baseAddress = (struct DiscInfo*)0x80000000;
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if (baseAddress->mWiiMagic || baseAddress->mGCNMagic) {
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initMods(baseAddress);
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(*_codeHandler)(); //Call codehandler
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u32 *functionAddr;
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if (baseAddress->mWiiMagic)
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{
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functionAddr = findFunction((u32 *)infoPointer->_wiiVIHook, (u32 *)baseAddress, 0x817FFF00, 0x4);
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}
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else
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{
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functionAddr = findFunction((u32 *)infoPointer->_gcnVIHook, (u32 *)baseAddress, 0x817FFF00, 0x8);
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}
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if (functionAddr)
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{
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hookFunction(functionAddr, 0x4E800020, 0x800018A8);
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}
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}
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}
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(*_init_registers)(); //Call game entry "_init_registers"
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}
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int main()
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{
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struct DiscInfo *baseAddress = (struct DiscInfo *)0x80000000;
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if (baseAddress->mWiiMagic || baseAddress->mGCNMagic)
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{
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initMods(baseAddress);
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(*_codeHandler)();
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}
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(*_init_registers)();
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}
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