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Do not hardcode the FIRM version check for the module patch, check for the free space to be enough

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Aurora 2016-09-03 18:00:22 +02:00
parent 6afc8b3b5c
commit 9862256ca7
2 changed files with 14 additions and 14 deletions
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8
source/firm.c
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@ -302,7 +302,7 @@ static inline void patchNativeFirm(u32 firmVersion, FirmwareSource nandType, u32
process9MemAddr;
u8 *process9Offset = getProcess9(arm9Section + 0x15000, section[2].size - 0x15000, &process9Size, &process9MemAddr);
//Find Kernel11 SVC table and free space locations
//Find Kernel11 SVC table and handler, exceptions page and free space locations
u8 *freeK11Space;
u32 *arm11SvcHandler,
*arm11ExceptionsPage,
@ -361,11 +361,7 @@ static inline void patchNativeFirm(u32 firmVersion, FirmwareSource nandType, u32
if(CONFIG(9))
{
patchArm11SvcAccessChecks(arm11SvcHandler);
//FIRMs between 9.3 and 10.4 don't have enough space on N3DS
if(!isN3DS || firmVersion <= 4 || firmVersion >= 0x21)
patchK11ModuleChecks(arm11Section1, section[1].size, &freeK11Space);
patchK11ModuleChecks(arm11Section1, section[1].size, &freeK11Space);
patchP9AccessChecks(process9Offset, process9Size);
}
}

20
source/patches.c
View File

@ -332,18 +332,22 @@ void patchK11ModuleChecks(u8 *pos, u32 size, u8 **freeK11Space)
/* We have to detour a function in the ARM11 kernel because builtin modules
are compressed in memory and are only decompressed at runtime */
//Inject our code into the free space
memcpy(*freeK11Space, k11modules, k11modules_size);
//Check that we have enough free space
if(*(u32 *)(*freeK11Space + k11modules_size - 4) == 0xFFFFFFFF)
{
//Inject our code into the free space
memcpy(*freeK11Space, k11modules, k11modules_size);
//Look for the code that decompresses the .code section of the builtin modules
const u8 pattern[] = {0xE5, 0x48, 0x00, 0x9D};
//Look for the code that decompresses the .code section of the builtin modules
const u8 pattern[] = {0xE5, 0x48, 0x00, 0x9D};
u32 *off = (u32 *)(memsearch(pos, pattern, size, sizeof(pattern)) - 0xB);
u32 *off = (u32 *)(memsearch(pos, pattern, size, sizeof(pattern)) - 0xB);
//Inject a jump (BL) instruction to our code at the offset we found
*off = 0xEB000000 | (((((u32)*freeK11Space) - ((u32)off + 8)) >> 2) & 0xFFFFFF);
//Inject a jump (BL) instruction to our code at the offset we found
*off = 0xEB000000 | (((((u32)*freeK11Space) - ((u32)off + 8)) >> 2) & 0xFFFFFF);
(*freeK11Space) += k11modules_size;
*freeK11Space += k11modules_size;
}
}
void patchUnitInfoValueSet(u8 *pos, u32 size)