WUMSLoader/source/kernel.cpp

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#include "kernel.h"
#include "../wumsloader/src/globals.h"
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#include "ElfUtils.h"
#include "wumsloader_elf.h"
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#include <coreinit/cache.h>
#include <coreinit/memorymap.h>
extern "C" void SCKernelCopyData(uint32_t addr, uint32_t src, uint32_t len);
extern "C" void SC_KernelCopyData(uint32_t addr, uint32_t src, uint32_t len);
void SetupWUMSLoader() {
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kern_write((void *) (KERN_SYSCALL_TBL_1 + (0x25 * 4)), (unsigned int) SCKernelCopyData);
kern_write((void *) (KERN_SYSCALL_TBL_2 + (0x25 * 4)), (unsigned int) SCKernelCopyData);
kern_write((void *) (KERN_SYSCALL_TBL_3 + (0x25 * 4)), (unsigned int) SCKernelCopyData);
kern_write((void *) (KERN_SYSCALL_TBL_4 + (0x25 * 4)), (unsigned int) SCKernelCopyData);
kern_write((void *) (KERN_SYSCALL_TBL_5 + (0x25 * 4)), (unsigned int) SCKernelCopyData);
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uint32_t entryPoint = load_loader_elf(0, (char *) wumsloader_elf, wumsloader_elf_size);
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unsigned int repl_addr = ADDRESS_main_entry_hook;
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KernelWriteU32(repl_addr, 0x48000003 | entryPoint);
DCFlushRange((void *) repl_addr, 4);
ICInvalidateRange((void *) (repl_addr), 4);
// We call the mainhook (wumloader) once with a MAGIC number to set up the WUMS Modules but not actually call the original main function
((int (*)(int, char **))(entryPoint))(WUMS_LOADER_SETUP_MAGIC_WORD, nullptr);
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}
void KernelWriteU32(uint32_t addr, uint32_t value) {
ICInvalidateRange(&value, 4);
DCFlushRange(&value, 4);
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auto dst = (uint32_t) OSEffectiveToPhysical(addr);
auto src = (uint32_t) OSEffectiveToPhysical((uint32_t) &value);
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SC_KernelCopyData(dst, src, 4);
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DCFlushRange((void *) addr, 4);
ICInvalidateRange((void *) addr, 4);
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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) {
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");
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}