Subversion Repositories HelenOS

#
# Copyright (c) 2008 Josef Cejka
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# - Redistributions of source code must retain the above copyright
#   notice, this list of conditions and the following disclaimer.
# - Redistributions in binary form must reproduce the above copyright
#   notice, this list of conditions and the following disclaimer in the
#   documentation and/or other materials provided with the distribution.
# - The name of the author may not be used to endorse or promote products
#   derived from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#

#include <kernel/arch/context_offset.h>

.text
.global setjmp
.global longjmp

.type setjmp,@function
setjmp:
    movl 0(%esp),%eax   # save pc value into eax    
    movl 4(%esp),%edx   # address of the jmp_buf structure to save context to 

        # save registers to the jmp_buf structure
    CONTEXT_SAVE_ARCH_CORE %edx %eax

    xorl %eax,%eax      # set_jmp returns 0
    ret

.type longjmp,@function
longjmp:

    movl 4(%esp), %ecx  # put address of jmp_buf into ecx
    movl 8(%esp), %eax  # put return value into eax 

        # restore registers from the jmp_buf structure
    CONTEXT_RESTORE_ARCH_CORE %ecx %edx

    movl %edx,0(%esp)   # put saved pc on stack
    ret