kern/switch_x86_64.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
  10  *
  11  * \version $Id$
  12  *
  13  * \author Bernardo Innocenti <bernie@develer.com>
  14  */
  15
  16 /*
  17  * $Log$
  18  * Revision 1.3  2006/02/24 01:35:40  bernie
  19  * Update for new emulator.
  20  *
  21  * Revision 1.2  2006/02/24 01:17:05  bernie
  22  * Update for new emulator.
  23  *
  24  * Revision 1.1  2005/11/27 03:06:15  bernie
  25  * Add x86_64 task switching (to be updated to new-style scheduler).
  26  *
  27  * Revision 1.1  2005/11/14 21:06:38  bernie
  28  * Add x86_64 support.
  29  *
  30  * Revision 1.2  2004/06/06 16:14:12  bernie
  31  * Add DevLib license information.
  32  *
  33  * Revision 1.1  2004/05/23 17:27:00  bernie
  34  * Import kern/ subdirectory.
  35  *
  36  */
  37
  38 /* I know it's ugly... */
  39 #.intel_syntax
  40
  41 /* void AsmSwitchContext(void **new_sp, void **save_sp) */
  42 /*                       %rdi           %rsi            */
  43 .globl asm_switch_context
  44 asm_switch_context:
  45         pushq   %rax
  46         pushq   %rbx
  47         pushq   %rcx
  48         pushq   %rdx
  49         pushq   %rsi
  50         pushq   %rdi
  51         pushq   %rbp
  52         movq    %rsp,(%rsi)             /* *save_sp = rsp */
  53         movq    (%rdi),%rsp             /* rsp = *new_sp */
  54         popq    %rbp
  55         popq    %rdi
  56         popq    %rsi
  57         popq    %rdx
  58         popq    %rcx
  59         popq    %rbx
  60         popq    %rax
  61         ret
  62
  63 /* int asm_switch_version(void) */
  64 .globl asm_switch_version
  65 asm_switch_version:
  66         mov     $1,%rax
  67         ret
  68