LowLevel/Luma3DS-3GX
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Apparently this halves the amount of stuttering with some games, on 11.3

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This commit is contained in:
TuxSH 2017-02-19 03:39:54 +01:00
parent ed8aee8b8c
commit 5f8a61201b
3 changed files with 30 additions and 0 deletions
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1
source/firm.c
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@ -177,6 +177,7 @@ u32 patchNativeFirm(u32 firmVersion, FirmwareSource nandType, u32 emuHeader, boo
{
//Stub svc 0x59
ret += stubSvcRestrictGpuDma(arm11Section1, arm11SvcTable, baseK11VA);
ret += stubTimerQueueSanityCheck(arm11Section1, firm->section[1].size);
}
ret += implementSvcGetCFWInfo(arm11Section1, arm11SvcTable, baseK11VA, &freeK11Space, isSafeMode);

28
source/patches.c
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@ -294,6 +294,34 @@ u32 stubSvcRestrictGpuDma(u8 *pos, u32 *arm11SvcTable, u32 baseK11VA)
return 0;
}
u32 stubTimerQueueSanityCheck(u8 *pos, u32 size)
{
const u8 pattern[] = {0xF0, 0x41, 0x2D, 0xE9, 0x00, 0x60, 0xA0, 0xE1, 0x00, 0x70,
0xA0, 0xE3, 0x20, 0x00, 0x86, 0xE2};
/* pattern2[] = {0x01, 0x20, 0xB0, 0xE1, 0xF5, 0xFF, 0xFF, 0x1A},
pattern3[] = {0x02, 0x00, 0x51, 0xE1, 0x01, 0x00, 0x00, 0x1A};
*/
u32 *off = (u32 *)memsearch(pos, pattern, size, sizeof(pattern));
if(off == NULL) return 1;
*off = 0xE12FFF1E;
return 0;
/*
This results in UAFs, rip.. I could do patterns for all of the incref/decref code they added, but this is a PITA
The idea was to tell the make stuff think the timer was always in the queue and that the refcount shouldn't be incremented.
That was worth trying, though.
off = (u32 *)memsearch(pos, pattern2, size, sizeof(pattern2));
if(off == NULL) return 1;
off[8] = 0xE3A00000;
off = (u32 *)memsearch(pos, pattern3, size, sizeof(pattern3));
if(off == NULL) return 1;
off[4] = 0xE3A00001;
*/
}
u32 implementSvcGetCFWInfo(u8 *pos, u32 *arm11SvcTable, u32 baseK11VA, u8 **freeK11Space, bool isSafeMode)
{
if(*(u32 *)(*freeK11Space + svcGetCFWInfo_bin_size - 4) != 0xFFFFFFFF) return 1;

1
source/patches.h
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@ -47,6 +47,7 @@ u32 patchNandNcchEncryptionCheck(u8 *pos, u32 size);
u32 patchCheckForDevCommonKey(u8 *pos, u32 size);
u32 reimplementSvcBackdoor(u8 *pos, u32 *arm11SvcTable, u32 baseK11VA, u8 **freeK11Space);
u32 stubSvcRestrictGpuDma(u8 *pos, u32 *arm11SvcTable, u32 baseK11VA);
u32 stubTimerQueueSanityCheck(u8 *pos, u32 size);
u32 implementSvcGetCFWInfo(u8 *pos, u32 *arm11SvcTable, u32 baseK11VA, u8 **freeK11Space, bool isSafeMode);
u32 patchArm9ExceptionHandlersInstall(u8 *pos, u32 size);
u32 getInfoForArm11ExceptionHandlers(u8 *pos, u32 size, u32 *codeSetOffset);