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Hook the Gecko codehandler to invalidate the icache.

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The codehandler is broken and does not do this itself.  This is a hack,
but a lot simpler than the alternatives.
This commit is contained in:
comex 2013-09-11 23:55:17 -04:00
parent 354b205dec
commit a316e2f182
4 changed files with 29 additions and 0 deletions
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4
Source/Core/Core/Src/Boot/Boot.cpp
View File

@ -192,6 +192,10 @@ bool CBoot::BootUp()
Memory::WriteBigEData(stubstr, 0x80001804, 8);
}
// Not part of the binary itself, but either we or Gecko OS might insert
// this, and it doesn't clear the icache properly.
HLE::Patch(0x800018a8, "GeckoCodehandler");
g_symbolDB.Clear();
VideoInterface::Preset(_StartupPara.bNTSC);
switch (_StartupPara.m_BootType)

1
Source/Core/Core/Src/HLE/HLE.cpp
View File

@ -63,6 +63,7 @@ static const SPatch OSPatches[] =
{ "___blank(char *,...)", HLE_OS::HLE_GeneralDebugPrint, HLE_HOOK_REPLACE, HLE_TYPE_DEBUG }, // used for early init things (normally)
{ "___blank", HLE_OS::HLE_GeneralDebugPrint, HLE_HOOK_REPLACE, HLE_TYPE_DEBUG },
{ "__write_console", HLE_OS::HLE_write_console, HLE_HOOK_REPLACE, HLE_TYPE_DEBUG }, // used by sysmenu (+more?)
{ "GeckoCodehandler", HLE_Misc::HLEGeckoCodehandler, HLE_HOOK_START, HLE_TYPE_GENERIC },
};
static const SPatch OSBreakPoints[] =

23
Source/Core/Core/Src/HLE/HLE_Misc.cpp
View File

@ -17,6 +17,7 @@
#include "IPC_HLE/WII_IPC_HLE_Device_usb.h"
#include "HLE.h"
#include "PowerPC/PPCAnalyst.h"
#include "PowerPC/PPCCache.h"
#include "PowerPC/SignatureDB.h"
#include "PowerPC/PPCSymbolDB.h"
#include "CommonPaths.h"
@ -242,4 +243,26 @@ void OSBootDol()
NPC = PC;
}
void HLEGeckoCodehandler()
{
// Work around the codehandler not properly invalidating the icache, but
// only the first few frames.
// (Project M uses a conditional to only apply patches after something has
// been read into memory, or such, so we do the first 5 frames. More
// robust alternative would be to actually detect memory writes, but that
// would be even uglier.)
u32 magic = 0xd01f1bad;
u32 existing = Memory::Read_U32(0x80001800);
if (existing - magic == 5)
{
return;
}
else if(existing - magic > 5)
{
existing = magic;
}
Memory::Write_U32(existing + 1, 0x80001800);
PowerPC::ppcState.iCache.Reset();
}
}

1
Source/Core/Core/Src/HLE/HLE_Misc.h
View File

@ -12,6 +12,7 @@ namespace HLE_Misc
void HBReload();
void OSBootDol();
void OSGetResetCode();
void HLEGeckoCodehandler();
}
#endif