Leaked source code of windows server 2003
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/*++
Copyright (c) 1999-2000 Microsoft Corporation
Module Name:
dbgmsg.c
Abstract:
Contains debug code for dbgcon and vprintf support.
MILLEN gets vprintf support.
NT gets dbg conn support.
Author:
Scott Holden (sholden) 20-Oct-1999
--*/
#include <tcpipbase.h>
#ifdef DEBUG_MSG
// Everything off by default.
uint DbgSettingsLevel = 0x00000000;
uint DbgSettingsZone = 0x00000000;
PDBGMSG g_pDbgMsg = DbgPrint;
#if MILLEN
ULONG g_fVprintf = 0;
VOID
InitVprintf();
ULONG
DbgMsg(
PCH pszFormat,
...
);
VOID
DebugMsgInit()
{
InitVprintf();
if (g_fVprintf) {
DbgPrint("TCPIP: vprintf is installed\n");
DbgSettingsLevel = 0x000000ff;
DbgSettingsZone = 0x00ffffff;
g_pDbgMsg = DbgMsg;
}
return;
}
VOID
InitVprintf()
{
//
// Check if Vprintf is installed
//
_asm {
mov eax, 0x0452
mov edi, 0x0
_emit 0xcd
_emit 0x20
_emit 0x46 // VMM Get DDB (Low)
_emit 0x01 // VMM Get DDB (High)
_emit 0x01 // VMM VxD ID (Low)
_emit 0x00 // VMM VxD ID (High)
mov [g_fVprintf], ecx
}
}
ULONG
DbgMsg(
PCH pszFormat,
...
)
{
_asm {
lea esi, pszFormat
mov eax, esi
add eax,4
push eax
push [esi]
_emit 0xcd
_emit 0x20
_emit 0x02 // Vprintf function
_emit 0
_emit 0x52 // Vprintf VxD ID (Low)
_emit 0x04 // Vprintf VxD ID (High)
add esp, 8
}
return 0;
}
#else // MILLEN
VOID
DebugMsgInit()
{
return;
}
#endif // !MILLEN
#endif // DEBUG_MSG