archived/GeckoLoader
Archived
1
0
Fork 0
Code Activity

More format changes

Browse source
This commit is contained in:
JoshuaMK 2020-04-14 18:10:46 -05:00 committed by GitHub
parent 416a49c670
commit 54b3579610
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
1 changed files with 119 additions and 93 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

112
loader.c
View file

@ -9,10 +9,18 @@ typedef unsigned short u16;
typedef unsigned char u8;
typedef int BOOL;
typedef u32 unk32;
enum { FALSE, TRUE };
enum { NULL };
enum
{
FALSE,
TRUE
};
enum
{
NULL
};
struct Info {
struct Info
{
u32 allocsize;
u32 _loaderSize;
u32 _loaderFullSize;
@ -21,14 +29,16 @@ struct Info {
u32 _gcnVIHook[8];
};
struct CodeList {
struct CodeList
{
u16 mBaseASM;
u16 mUpperBase;
u16 mOffsetASM;
u16 mLowerOffset;
};
struct DiscInfo {
struct DiscInfo
{
u8 mDiscID;
u16 mGameCode;
u8 mRegionCode;
@ -51,16 +61,12 @@ struct DiscInfo {
};
struct Info gInfo = {
.allocsize = 0, //Set to ASCII HEAP in bin file after compiling if using main.py
._loaderSize = 0, //Set to ASCII LSIZ in bin file after compiling if using main.py
._loaderFullSize = 0, //Set to ASCII FSIZ in bin file after compiling if using main.py
.allocsize = 0,
._loaderSize = 0,
._loaderFullSize = 0,
._codelistPointer = (struct CodeList *)0x800018F8,
._wiiVIHook = {0x7CE33B78, 0x38870034,
0x38A70038, 0x38C7004C},
._gcnVIHook = {0x7C030034, 0x38830020,
0x5485083C, 0x7C7F2A14,
0xA0030000, 0x7C7D2A14,
0x20A4003F, 0xB0030000},
._wiiVIHook = {0x7CE33B78, 0x38870034, 0x38A70038, 0x38C7004C},
._gcnVIHook = {0x7C030034, 0x38830020, 0x5485083C, 0x7C7F2A14, 0xA0030000, 0x7C7D2A14, 0x20A4003F, 0xB0030000},
};
static inline void flushAddr(void *addr)
@ -69,26 +75,33 @@ static inline void flushAddr(void* addr)
icbi(addr);
}
static inline void directWrite(u32* addr, u32 ptr) {
static inline void directWrite(u32 *addr, u32 ptr)
{
addr[0] = ptr;
flushAddr(addr);
}
static inline void directBranchEx(void* addr, void* ptr, BOOL lk) {
directWrite((u32*)(addr),
((((u32)(ptr) - (u32)(addr)) & 0x3ffffff) | 0x48000000 | !!lk));
static inline void directBranchEx(void *addr, void *ptr, BOOL link)
{
directWrite((u32 *)(addr), ((((u32)(ptr) - (u32)(addr)) & 0x3ffffff) | 0x48000000 | !!link));
}
void (*_init_registers)(void) = &gInfo; //Set to game entry address. ASCII HEAP in bin file after compiling if using main.py
void (*_codeHandler)(void) = &gInfo; //Set to codehandler entry address. Set to 800018A8 in bin file after compiling
void (*_init_registers)(void) = &gInfo;
void (*_codeHandler)(void) = &gInfo;
static inline u32* findFunction(u32* hookData, u32* start, u32 end, u32 arrayLength) {
static inline u32 *findFunction(u32 *hookData, u32 *start, u32 end, u32 arrayLength)
{
u32 index = 0;
for (u32 i = 0; (u32)&start[i] < end; ++i) {
if (start[i] == hookData[index]) index = index + 1;
else index = 0;
if (index >= (arrayLength - 1)) {
if ((u32)&start[i] < &gInfo || (u32)&start[i] > (u32)&gInfo + 0x100){
for (u32 i = 0; (u32)&start[i] < end; ++i)
{
if (start[i] == hookData[index])
index = index + 1;
else
index = 0;
if (index >= (arrayLength - 1))
{
if ((u32)&start[i] < &gInfo || (u32)&start[i] > (u32)&gInfo + 0x100)
{
return &start[i];
}
}
@ -96,37 +109,45 @@ static inline u32* findFunction(u32* hookData, u32* start, u32 end, u32 arrayLen
return NULL;
}
void hookFunction(u32* start, u32 hookInstruction, u32 hookTo) {
void hookFunction(u32 *start, u32 hookInstruction, u32 hookTo)
{
int i = 0;
while (start[i] != hookInstruction) {
while (start[i] != hookInstruction)
{
++i;
}
directBranchEx((u32 *)(&start[i]), (void *)(hookTo), FALSE);
}
static inline void overwriteValue(u32* addr, u32 newValue) {
static inline void overwriteValue(u32 *addr, u32 newValue)
{
addr[0] = newValue;
flushAddr(&addr[0]);
}
void initMods(struct DiscInfo* baseAddress) {
void initMods(struct DiscInfo *baseAddress)
{
struct Info *infoPointer = &gInfo;
const u32 *geckoPointerInit = (u32 *)(u32)baseAddress + 0x18F8;
u32 sizeDiff = infoPointer->_loaderFullSize - infoPointer->_loaderSize;
const u32 *sourcePointer = (u32 *)(infoPointer);
if (infoPointer->_codelistPointer) {
if (baseAddress->mWiiMagic) {
if (infoPointer->_codelistPointer)
{
if (baseAddress->mWiiMagic)
{
baseAddress->mHeapPointer = (u32)baseAddress->mWiiHeap - infoPointer->allocsize;
baseAddress->mWiiHeap = (u32)baseAddress->mHeapPointer;
}
else if(baseAddress->mGCNMagic) {
else if (baseAddress->mGCNMagic)
{
baseAddress->mHeapPointer = (u32)baseAddress->mHeapPointer - infoPointer->allocsize;
}
if (infoPointer->_loaderFullSize > 0 && infoPointer->_loaderSize > 0) {
while (sizeDiff > 0) {
if (infoPointer->_loaderFullSize > 0 && infoPointer->_loaderSize > 0)
{
while (sizeDiff > 0)
{
sizeDiff = sizeDiff - 4;
baseAddress->mHeapPointer[sizeDiff / 4] = sourcePointer[sizeDiff / 4];
}
@ -136,24 +157,29 @@ void initMods(struct DiscInfo* baseAddress) {
flushAddr(&infoPointer->_codelistPointer->mLowerOffset);
u32 *functionAddr;
if (baseAddress->mWiiMagic) {
if (baseAddress->mWiiMagic)
{
functionAddr = findFunction((u32 *)infoPointer->_wiiVIHook, (u32 *)baseAddress, 0x817FFF00, 0x4);
}
else {
else
{
functionAddr = findFunction((u32 *)infoPointer->_gcnVIHook, (u32 *)baseAddress, 0x817FFF00, 0x8);
}
if (functionAddr) {
if (functionAddr)
{
hookFunction(functionAddr, 0x4E800020, 0x800018A8);
}
}
}
}
int main() {
int main()
{
struct DiscInfo *baseAddress = (struct DiscInfo *)0x80000000;
if (baseAddress->mWiiMagic || baseAddress->mGCNMagic) {
if (baseAddress->mWiiMagic || baseAddress->mGCNMagic)
{
initMods(baseAddress);
(*_codeHandler)(); //Call codehandler
(*_codeHandler)();
}
(*_init_registers)(); //Call game entry "_init_registers"
(*_init_registers)();
}