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Cxbx-Reloaded
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Implement RtlCaptureContext using knowledge from reverse engineering an official kernel.

This commit is contained in:
Fisherman166 2019-02-02 22:19:35 -08:00
parent f0f300353c
commit 27573b6629
1 changed files with 26 additions and 3 deletions
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29
src/core/kernel/exports/EmuKrnlRtl.cpp
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@ -251,16 +251,39 @@ XBSYSAPI EXPORTNUM(264) xboxkrnl::VOID NTAPI xboxkrnl::RtlAssert
// ******************************************************************
// * 0x0109 - RtlCaptureContext()
// ******************************************************************
__declspec(naked) // REQUIRED - No registers can be touched by the compiler or the state will be corrupted.
XBSYSAPI EXPORTNUM(265) xboxkrnl::VOID NTAPI xboxkrnl::RtlCaptureContext
(
IN PCONTEXT ContextRecord
)
{
LOG_FUNC_ONE_ARG(ContextRecord);
// NOTE: this function expects the caller to be __cdecl, or else it fails
__asm {
push ebx
mov ebx, [esp + 8] // ebx = ContextRecord;
LOG_UNIMPLEMENTED();
mov [ebx + CONTEXT.Eax], eax // ContextRecord->Eax = eax;
mov eax, [esp] // eax = original value of ebx
mov [ebx + CONTEXT.Ebx], eax // ContextRecord->Ebx = original value of ebx
mov [ebx + CONTEXT.Ecx], ecx // ContextRecord->Ecx = ecx;
mov [ebx + CONTEXT.Edx], edx // ContextRecord->Edx = edx;
mov [ebx + CONTEXT.Esi], esi // ContextRecord->Esi = esi;
mov [ebx + CONTEXT.Edi], edi // ContextRecord->Edi = edi;
mov word ptr [ebx + CONTEXT.SegCs], cs // ContextRecord->SegCs = cs;
mov word ptr [ebx + CONTEXT.SegSs], ss // ContextRecord->SegSs = ss;
pushfd
pop [ebx + CONTEXT.EFlags] // ContextRecord->EFlags = flags;
mov[ebx + CONTEXT.Ebp], ebp // ContextRecord->Ebp = ebp;
mov eax, [ebp + 4] // eax = return address;
mov [ebx + CONTEXT.Eip], eax // ContextRecord->Eip = return address;
lea eax, [ebp + 8]
mov [ebx + CONTEXT.Esp], eax // ContextRecord->Esp = original esp value;
pop ebx
ret 4
}
}
// ******************************************************************