reactos/ntoskrnl/ke/i386/stkswitch.S

   1 /*
   2  * FILE:            ntoskrnl/ke/i386/tskswitch.S
   3  * PURPOSE:         Microkernel thread support
   4  * PROGRAMMER:      David Welch (welch@cwcom.net)
   5  * UPDATE HISTORY:
   6  *                  Created 09/10/00
   7  */
   8
   9 /* INCLUDES ******************************************************************/
  10 #include <ndk/asm.h>
  11
  12 /* FUNCTIONS ****************************************************************/
  13
  14 /*
  15  * FUNCTION:     KeStackSwitchAndRet
  16  * PURPOSE:      Switch to a new stack and return from the first frame on
  17  *               the new stack which was assumed to a stdcall function with
  18  *               8 bytes of arguments and which saved edi, esi and ebx.
  19  */
  20 .globl _KeStackSwitchAndRet@4
  21 _KeStackSwitchAndRet@4:
  22         pushl   %ebp
  23         movl    %esp, %ebp
  24
  25         cli
  26
  27         movl    8(%ebp), %esp
  28
  29         sti
  30
  31         popl    %edi
  32         popl    %esi
  33         popl    %ebx
  34
  35         popl    %ebp
  36         ret     $8
  37
  38 .globl _KePushAndStackSwitchAndSysRet@8
  39 _KePushAndStackSwitchAndSysRet@8:
  40         pushl   %ebp
  41         movl    %esp, %ebp
  42
  43         pushl   %ebx
  44         pushl   %esi
  45         pushl   %edi
  46
  47         cli
  48
  49         pushl   8(%ebp)
  50
  51         movl    %fs:KPCR_CURRENT_THREAD, %ebx
  52         movl    %esp, KTHREAD_CALLBACK_STACK(%ebx)
  53         movl    12(%ebp), %esp
  54
  55         sti
  56
  57         push    $0
  58         call    _KeLowerIrql@4
  59
  60         jmp _KiServiceExit
  61