msvc6/ntoskrnl/ke_i386_bthread.c

   1 /*
   2  *  ReactOS kernel
   3  *  Copyright (C) 2000 David Welch <welch@cwcom.net>
   4  *
   5  *  Moved to MSVC-compatible inline assembler by Mike Nordell, 2003-12-25
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License as published by
   9  *  the Free Software Foundation; either version 2 of the License, or
  10  *  (at your option) any later version.
  11  *
  12  *  This program is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *  GNU General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License
  18  *  along with this program; if not, write to the Free Software
  19  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20  */
  21 /* $Id: ke_i386_bthread.c,v 1.1 2004/02/06 08:21:56 fireball Exp $
  22  *
  23  * COPYRIGHT:       See COPYING in the top level directory
  24  * PROJECT:         ReactOS kernel
  25  * FILE:            ntoskrnl/ke/i386/bthread.S
  26  * PURPOSE:         Trap handlers
  27  * PROGRAMMER:      David Welch (david.welch@seh.ox.ac.uk)
  28  */
  29
  30 /* INCLUDES ******************************************************************/
  31
  32 #include <ddk/ntddk.h>
  33 #include <ddk/status.h>
  34 #include <internal/i386/segment.h>
  35 #include <internal/i386/fpu.h>
  36 #include <internal/ps.h>
  37 #include <ddk/defines.h>
  38
  39 /* Values for contextflags */
  40 #define CONTEXT_i386    0x10000
  41 #ifndef CONTEXT_CONTROL
  42 #define CONTEXT_CONTROL         (CONTEXT_i386 | 1)
  43 #endif
  44 #ifndef CONTEXT_INTEGER
  45 #define CONTEXT_INTEGER         (CONTEXT_i386 | 2)
  46 #endif
  47 #ifndef CONTEXT_SEGMENTS
  48 #define CONTEXT_SEGMENTS        (CONTEXT_i386 | 4)
  49 #endif
  50 #ifndef CONTEXT_FLOATING_POINT
  51 #define CONTEXT_FLOATING_POINT  (CONTEXT_i386 | 8)
  52 #endif
  53 #ifndef CONTEXT_DEBUG_REGISTERS
  54 #define CONTEXT_DEBUG_REGISTERS (CONTEXT_i386 | 0x10)
  55 #endif
  56 #ifndef CONTEXT_FULL
  57 #define CONTEXT_FULL (CONTEXT_CONTROL | CONTEXT_INTEGER | CONTEXT_SEGMENTS)
  58 #endif
  59
  60 /* FUNCTIONS *****************************************************************/
  61
  62 void KeReturnFromSystemCallWithHook();
  63
  64 VOID PiBeforeBeginThread(CONTEXT c);
  65
  66 /*
  67  *
  68  */
  69
  70 __declspec(naked)
  71 VOID PsBeginThread(PKSTART_ROUTINE StartRoutine, PVOID StartContext)
  72 {
  73         /*
  74          * This isn't really a function, we are called as the return address
  75          * of the context switch function
  76          */
  77
  78         /*
  79          * Do the necessary prolog after a context switch
  80          */
  81         __asm
  82         {
  83         call    PiBeforeBeginThread
  84
  85         /*
  86          * Call the actual start of the thread
  87          */
  88         // We must NOT use the arguments by name. VC then uses EBP-relative
  89         // addressing, and with an EBP of 0 you can imagine what happens.
  90         mov     ebx, 4[esp]                     // StartRoutine
  91         mov     eax, 8[esp]                     // StartContext
  92         push    eax
  93         call    ebx                        /* Call the start routine */
  94         add             esp, 4
  95
  96         /*
  97          * Terminate the thread
  98          */
  99         push    eax
 100         call    PsTerminateSystemThread
 101         add             esp, 4
 102
 103         }
 104
 105         /* If that fails then bug check */
 106         KeBugCheck(0);
 107
 108         /* And if that fails then loop */
 109         for (;;)
 110                 ; // forever
 111 }
 112
 113
 114 __declspec(naked)
 115 VOID PsBeginThreadWithContextInternal(VOID)
 116 {
 117         /*
 118          * This isn't really a function, we are called as the return
 119          * address of a context switch
 120          */
 121
 122         /*
 123          * Do the necessary prolog before the context switch
 124          */
 125         __asm
 126         {
 127         call    PiBeforeBeginThread
 128
 129         /*
 130          * Load the context flags.
 131          */
 132         pop             ebx
 133
 134         /*
 135          * Load the debugging registers
 136          */
 137         test    ebx, (CONTEXT_DEBUG_REGISTERS & ~CONTEXT_i386)
 138         jz      L1
 139         pop             eax     __asm   mov             dr0, eax
 140         pop             eax     __asm   mov             dr1, eax
 141         pop             eax     __asm   mov             dr2, eax
 142         pop             eax     __asm   mov             dr3, eax
 143         pop             eax     __asm   mov             dr6, eax
 144         pop             eax     __asm   mov             dr7, eax
 145         jmp     L3
 146 L1:
 147         add             esp, 24
 148 L3:
 149
 150         /*
 151          * Load the floating point registers
 152          */
 153         mov             eax, HardwareMathSupport
 154         test    eax,eax
 155         jz      L2
 156         test    ebx, (CONTEXT_FLOATING_POINT & ~CONTEXT_i386)
 157         jz      L2
 158         frstor  [esp]
 159 L2:
 160         add             esp, 112
 161
 162         /* Load the rest of the thread's user mode context. */
 163         mov             eax, 0
 164         jmp             KeReturnFromSystemCallWithHook
 165         }
 166 }
 167