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2718 cejka 1
#
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# Copyright (c) 2008 Josef Cejka
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# All rights reserved.
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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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# - 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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# - Redistributions in binary form must reproduce the above copyright
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#   notice, this list of conditions and the following disclaimer in the
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#   documentation and/or other materials provided with the distribution.
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# - The name of the author may not be used to endorse or promote products
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#   derived from this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#
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.text
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.global setjmp
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.global longjmp
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.type setjmp,@function
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setjmp:
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	movl	0(%esp), %ecx	# save current pc
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	leal	4(%esp), %edx	# save stack pointer
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	movl	(%edx), %eax	# get jmp_buf pointer
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		# Save registers 
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	movl %ebx, 0(%eax)
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	movl %esi, 4(%eax)
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	movl %edi, 8(%eax)
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	movl %ebp, 12(%eax)
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	movl %edx, 16(%eax)
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	movl %ecx, 20(%eax) # save pc
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	ret
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.type longjmp,@function
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longjmp:
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	movl 4(%esp), %ecx	# put address of jmp_buf into ecx
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	movl 8(%esp), %eax	# put return value into eax	
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		# restore all registers
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	movl 0(%ecx), %ebx
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	movl 4(%ecx), %esi
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	movl 8(%ecx), %edi
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	movl 12(%ecx), %ebp
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	movl 16(%ecx), %esp
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	movl 20(%ecx), %edx # saved return address 
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	jmp *%edx