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