reactos/msvc6/ntoskrnl/ke_i386_bthread.c

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/*
* ReactOS kernel
* Copyright (C) 2000 David Welch <welch@cwcom.net>
*
* Moved to MSVC-compatible inline assembler by Mike Nordell, 2003-12-25
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/* $Id: ke_i386_bthread.c,v 1.1 2004/02/06 08:21:56 fireball Exp $
*
* COPYRIGHT: See COPYING in the top level directory
* PROJECT: ReactOS kernel
* FILE: ntoskrnl/ke/i386/bthread.S
* PURPOSE: Trap handlers
* PROGRAMMER: David Welch (david.welch@seh.ox.ac.uk)
*/
/* INCLUDES ******************************************************************/
#include <ddk/ntddk.h>
#include <ddk/status.h>
#include <internal/i386/segment.h>
#include <internal/i386/fpu.h>
#include <internal/ps.h>
#include <ddk/defines.h>
/* Values for contextflags */
#define CONTEXT_i386 0x10000
#ifndef CONTEXT_CONTROL
#define CONTEXT_CONTROL (CONTEXT_i386 | 1)
#endif
#ifndef CONTEXT_INTEGER
#define CONTEXT_INTEGER (CONTEXT_i386 | 2)
#endif
#ifndef CONTEXT_SEGMENTS
#define CONTEXT_SEGMENTS (CONTEXT_i386 | 4)
#endif
#ifndef CONTEXT_FLOATING_POINT
#define CONTEXT_FLOATING_POINT (CONTEXT_i386 | 8)
#endif
#ifndef CONTEXT_DEBUG_REGISTERS
#define CONTEXT_DEBUG_REGISTERS (CONTEXT_i386 | 0x10)
#endif
#ifndef CONTEXT_FULL
#define CONTEXT_FULL (CONTEXT_CONTROL | CONTEXT_INTEGER | CONTEXT_SEGMENTS)
#endif
/* FUNCTIONS *****************************************************************/
void KeReturnFromSystemCallWithHook();
VOID PiBeforeBeginThread(CONTEXT c);
/*
*
*/
__declspec(naked)
VOID PsBeginThread(PKSTART_ROUTINE StartRoutine, PVOID StartContext)
{
/*
* This isn't really a function, we are called as the return address
* of the context switch function
*/
/*
* Do the necessary prolog after a context switch
*/
__asm
{
call PiBeforeBeginThread
/*
* Call the actual start of the thread
*/
// We must NOT use the arguments by name. VC then uses EBP-relative
// addressing, and with an EBP of 0 you can imagine what happens.
mov ebx, 4[esp] // StartRoutine
mov eax, 8[esp] // StartContext
push eax
call ebx /* Call the start routine */
add esp, 4
/*
* Terminate the thread
*/
push eax
call PsTerminateSystemThread
add esp, 4
}
/* If that fails then bug check */
KeBugCheck(0);
/* And if that fails then loop */
for (;;)
; // forever
}
__declspec(naked)
VOID PsBeginThreadWithContextInternal(VOID)
{
/*
* This isn't really a function, we are called as the return
* address of a context switch
*/
/*
* Do the necessary prolog before the context switch
*/
__asm
{
call PiBeforeBeginThread
/*
* Load the context flags.
*/
pop ebx
/*
* Load the debugging registers
*/
test ebx, (CONTEXT_DEBUG_REGISTERS & ~CONTEXT_i386)
jz L1
pop eax __asm mov dr0, eax
pop eax __asm mov dr1, eax
pop eax __asm mov dr2, eax
pop eax __asm mov dr3, eax
pop eax __asm mov dr6, eax
pop eax __asm mov dr7, eax
jmp L3
L1:
add esp, 24
L3:
/*
* Load the floating point registers
*/
mov eax, HardwareMathSupport
test eax,eax
jz L2
test ebx, (CONTEXT_FLOATING_POINT & ~CONTEXT_i386)
jz L2
frstor [esp]
L2:
add esp, 112
/* Load the rest of the thread's user mode context. */
mov eax, 0
jmp KeReturnFromSystemCallWithHook
}
}