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Add reversed engineered KeLeaveCriticalRegion and KeEnterCriticalRegion kernel functions

This commit is contained in:
Fisherman166 2018-01-28 23:08:38 -08:00
parent 735a4bcfc5
commit 49fc9be353
1 changed files with 28 additions and 10 deletions
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38
src/CxbxKrnl/EmuKrnlKe.cpp
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@ -565,19 +565,29 @@ XBSYSAPI EXPORTNUM(100) xboxkrnl::VOID NTAPI xboxkrnl::KeDisconnectInterrupt
KiUnlockDispatcherDatabase(OldIrql);
}
// From looking at the wine src code for Rtl*CriticalSection functions
// and from seeing what the xbox kernel does with KeEnter/Leave CriticalRegion,
// I can only conclude that is is accessing a Teb structure in Xbox memory.
// Many Xbox Kernel functions load this pointer and make changes to fields
// in it. More research will be needed to define all fields
uint8_t* get_thread_Teb() {
return (uint8_t*)0x80047BF0;
}
#define CRITICAL_REGION_UNKNOWN1 (get_thread_Teb() + 0x34)
#define CRITICAL_REGION_UNKNOWN2 (get_thread_Teb() + 0x49)
#define CRITICAL_REGION_UNKNOWN3 (get_thread_Teb() + 0x68)
// ******************************************************************
// * 0x0065 - KeEnterCriticalRegion()
// ******************************************************************
XBSYSAPI EXPORTNUM(101) xboxkrnl::VOID NTAPI xboxkrnl::KeEnterCriticalRegion
(
VOID
VOID
)
{
LOG_FUNC();
// TODO : Disable kernel APCs
LOG_UNIMPLEMENTED();
LOG_FUNC();
uint32_t* critical_region_unk = (uint32_t*)CRITICAL_REGION_UNKNOWN3;
*critical_region_unk--;
}
// ******************************************************************
@ -1039,14 +1049,22 @@ void ConnectKeInterruptTimeToThunkTable()
// ******************************************************************
XBSYSAPI EXPORTNUM(122) xboxkrnl::VOID NTAPI xboxkrnl::KeLeaveCriticalRegion
(
VOID
VOID
)
{
LOG_FUNC();
LOG_FUNC();
// TODO : Enable kernel APCs
uint32_t* critcal_region_unk1 = (uint32_t*)CRITICAL_REGION_UNKNOWN1;
uint8_t* critcal_region_unk2 = CRITICAL_REGION_UNKNOWN2;
uint32_t* critical_region_unk3 = (uint32_t*)CRITICAL_REGION_UNKNOWN3;
LOG_UNIMPLEMENTED();
*critical_region_unk3++;
if(*critical_region_unk3 == 0) {
if(*critcal_region_unk1 != (uint32_t)critcal_region_unk1) {
*critcal_region_unk2 = 1;
HalRequestSoftwareInterrupt(1);
}
}
}
XBSYSAPI EXPORTNUM(123) xboxkrnl::LONG NTAPI xboxkrnl::KePulseEvent