kern/switch_win32.s

   1 /*!
   2  * \file
   3  * <!--
   4  * Copyright 2004 Develer S.r.l. (http://www.develer.com/)
   5  * Copyright 1999,2000,2001 Bernardo Innocenti <bernie@develer.com>
   6  * This file is part of DevLib - See devlib/README for information.
   7  * -->
   8  *
   9  * \brief i386 context switch for WIN32
  10  *
  11  * \version $Id$
  12  *
  13  * \author Bernardo Innocenti <bernie@develer.com>
  14  */
  15
  16 __declspec(naked) void AsmSwitchContext(void * new_sp, void ** save_sp)
  17 {
  18         __asm
  19         {
  20                 push    eax
  21                 push    ebx
  22                 push    ecx
  23                 push    edx
  24                 push    esi
  25                 push    edi
  26                 push    ebp
  27                 mov             ebp,dword ptr [esp+24h] ; ebp <- save_sp
  28                 mov             dword ptr [ebp],esp             ; *save_sp = esp
  29                 mov             esp,dword ptr [esp+20h] ; new_sp
  30                 pop             ebp
  31                 pop             edi
  32                 pop             esi
  33                 pop             edx
  34                 pop             ecx
  35                 pop             ebx
  36                 pop             eax
  37                 ret
  38         }
  39 }
  40
  41 __declspec(naked) void AsmReplaceContext(void * new_sp, void ** dummy)
  42 {
  43         __asm
  44         {
  45                 mov             esp,dword ptr [esp + 4] ; new_sp
  46                 pop             ebp
  47                 pop             edi
  48                 pop             esi
  49                 pop             edx
  50                 pop             ecx
  51                 pop             ebx
  52                 pop             eax
  53                 ret
  54         }
  55 }
  56