KernelModule/source/main.c

97 lines
2.3 KiB
C

#include <whb/log.h>
#include <whb/log_udp.h>
#include <coreinit/memorymap.h>
#include <wums.h>
#include <coreinit/cache.h>
WUMS_MODULE_EXPORT_NAME("homebrew_kernel");
#define KERN_SYSCALL_TBL1 0xFFE84C70 //Unknown
#define KERN_SYSCALL_TBL2 0xFFE85070 //Games
#define KERN_SYSCALL_TBL3 0xFFE85470 //Loader
#define KERN_SYSCALL_TBL4 0xFFEAAA60 //Home menu
#define KERN_SYSCALL_TBL5 0xFFEAAE60 //Browser
extern void SCKernelCopyData(uint32_t dst, uint32_t src, uint32_t len);
extern void KernelCopyDataInternal(uint32_t dst, uint32_t src, uint32_t len);
void kernelInitialize();
extern void KernelCopyData(uint32_t dst, uint32_t src, uint32_t len){
KernelCopyDataInternal(dst, src, len);
}
WUMS_EXPORT_FUNCTION(KernelCopyData);
/* Write a 32-bit word with kernel permissions */
void __attribute__ ((noinline)) kern_write(void *addr, uint32_t value) {
asm volatile (
"li 3,1\n"
"li 4,0\n"
"mr 5,%1\n"
"li 6,0\n"
"li 7,0\n"
"lis 8,1\n"
"mr 9,%0\n"
"mr %1,1\n"
"li 0,0x3500\n"
"sc\n"
"nop\n"
"mr 1,%1\n"
:
: "r"(addr), "r"(value)
: "memory", "ctr", "lr", "0", "3", "4", "5", "6", "7", "8", "9", "10",
"11", "12"
);
}
/* Read a 32-bit word with kernel permissions */
uint32_t __attribute__ ((noinline)) kern_read(const void *addr) {
uint32_t result;
asm volatile (
"li 3,1\n"
"li 4,0\n"
"li 5,0\n"
"li 6,0\n"
"li 7,0\n"
"lis 8,1\n"
"mr 9,%1\n"
"li 0,0x3400\n"
"mr %0,1\n"
"sc\n"
"nop\n"
"mr 1,%0\n"
"mr %0,3\n"
: "=r"(result)
: "b"(addr)
: "memory", "ctr", "lr", "0", "3", "4", "5", "6", "7", "8", "9", "10",
"11", "12"
);
return result;
}
void PatchSyscall(int index, uint32_t addr) {
kern_write((void *) (KERN_SYSCALL_TBL1 + index * 4), addr);
kern_write((void *) (KERN_SYSCALL_TBL2 + index * 4), addr);
kern_write((void *) (KERN_SYSCALL_TBL3 + index * 4), addr);
kern_write((void *) (KERN_SYSCALL_TBL4 + index * 4), addr);
kern_write((void *) (KERN_SYSCALL_TBL5 + index * 4), addr);
}
void kernelInitialize() {
static uint8_t ucSyscallsSetupRequired = 1;
if (!ucSyscallsSetupRequired){
return;
}
ucSyscallsSetupRequired = 0;
PatchSyscall(0x25, (uint32_t) SCKernelCopyData);
WUMS_INITIALIZE(){
kernelInitialize();
}
int main(int argc, char **argv) {
return 0;
}