131 lines
4.5 KiB
ArmAsm
131 lines
4.5 KiB
ArmAsm
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/**************************************************************************
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* arch/x86/src/qemu/up_saveusercontext.S
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*
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* Copyright (C) 2011 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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**************************************************************************/
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/**************************************************************************
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* Conditional Compilation Options
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**************************************************************************/
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/**************************************************************************
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* Included Files
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**************************************************************************/
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#include <nuttx/config.h>
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#include <arch/irq.h>
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#include "up_internal.h"
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/**************************************************************************
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* Private Definitions
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**************************************************************************/
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#ifdef __CYGWIN__
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# define SYMBOL(s) _##s
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#else
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# define SYMBOL(s) s
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#endif
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/**************************************************************************
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* Private Types
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**************************************************************************/
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/**************************************************************************
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* Private Function Prototypes
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**************************************************************************/
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/**************************************************************************
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* Global Variables
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**************************************************************************/
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/**************************************************************************
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* Private Variables
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**************************************************************************/
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/**************************************************************************
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* Private Functions
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**************************************************************************/
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/**************************************************************************
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* Public Functions
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**************************************************************************/
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/**************************************************************************
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* Name: up_saveusercontext
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*
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* Full C prototype:
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* int up_saveusercontext(uint32_t *regs);
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*
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**************************************************************************/
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#ifdef CONFIG_X86_NASM
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# warning "No Nasm support"
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#else
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.text
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.globl SYMBOL(up_saveusercontext)
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#ifndef __CYGWIN__
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.type SYMBOL(up_saveusercontext), @function
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#endif
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SYMBOL(up_saveusercontext):
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/* %ebx, %esi, %edi, and %ebp must be preserved.
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* save %ebx, $esi, and %edi now... */
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movl 4(%esp), %eax
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movl %ebx, (REG_EBX)(%eax)
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movl %esi, (REG_ESI)(%eax)
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movl %edi, (REG_EDI)(%eax)
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/* Save the value of SP as will be after we return */
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leal 4(%esp), %ecx
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movl %ecx, (REG_SP)(%eax)
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/* Save the return PC */
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movl 0(%esp), %ecx
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movl %ecx, (REG_PC)(%eax)
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/* Save the framepointer */
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movl %ebp, (REG_EBP)(%eax)
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/* And return 0 */
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xorl %eax, %eax
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ret
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#ifndef __CYGWIN__
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.size SYMBOL(up_saveusercontext), . - SYMBOL(up_saveusercontext)
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#endif
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.end
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#endif
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