LowLevel/Luma3DS-3GX
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Cleanup

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Aurora 2016-08-31 13:49:10 +02:00
parent 4da0708b51
commit 048bf0ee4d
1 changed files with 15 additions and 19 deletions
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34
source/patches.c
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@ -341,32 +341,28 @@ void patchArm11SvcAccessChecks(u32 *arm11SvcHandler)
//It's mainly Subv's code here: //It's mainly Subv's code here:
void patchK11ModuleChecks(u8 *pos, u32 size, u8 **freeK11Space) void patchK11ModuleChecks(u8 *pos, u32 size, u8 **freeK11Space)
{ {
// We have to detour a function in the ARM11 kernel because builtin modules //We have to detour a function in the ARM11 kernel because builtin modules
// are compressed in memory and are only decompressed at runtime. //are compressed in memory and are only decompressed at runtime.
u8 *freeSpace = *freeK11Space; //Find the code that decompresses the .code section of the builtin modules and detour it with a jump to our code
(*freeK11Space) += k11modules_size;
// Inject our code into the free space
memcpy(freeSpace, k11modules, k11modules_size);
// Find the code that decompresses the .code section of the builtin modules and detour it with a jump to our code
const u8 pattern[] = { 0x00, 0x00, 0x94, 0xE5, 0x18, 0x10, 0x90, 0xE5, 0x28, 0x20, const u8 pattern[] = { 0x00, 0x00, 0x94, 0xE5, 0x18, 0x10, 0x90, 0xE5, 0x28, 0x20,
0x90, 0xE5, 0x48, 0x00, 0x9D, 0xE5 }; 0x90, 0xE5, 0x48, 0x00, 0x9D, 0xE5 };
u8 *off = memsearch(pos, pattern, size, 16); u32 *off = (u32 *)memsearch(pos, pattern, size, 16);
// We couldn't find the code that decompresses the module //We couldn't find the code that decompresses the module
if (off == NULL) if(off == NULL) return;
return;
// Inject a jump instruction to our code at the offset we found //Inject our code into the free space
// Construct a jump (BL) instruction to our code memcpy(*freeK11Space, k11modules, k11modules_size);
u32 offset = ((((u32)freeSpace) - ((u32)off + 8)) >> 2) & 0xFFFFFF;
u32 instruction = offset | (1 << 24) | (0x5 << 25) | (0xE << 28);
// Write our jump //Inject a jump instruction to our code at the offset we found
memcpy(off, &instruction, 4); //Construct a jump (BL) instruction to our code
u32 offset = ((((u32)*freeK11Space) - ((u32)off + 8)) >> 2) & 0xFFFFFF;
*off = offset | (1 << 24) | (0x5 << 25) | (0xE << 28);
(*freeK11Space) += k11modules_size;
} }
void patchP9AccessChecks(u8 *pos, u32 size) void patchP9AccessChecks(u8 *pos, u32 size)