WebSVN – HelenOS – Diff – /trunk/uspace/lib/libc/arch/ia32/src/setjmp.S


#
# 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
 
 

Subversion Repositories HelenOS

(root)/trunk/uspace/lib/libc/arch/ia32/src/setjmp.S – Rev 2773 → 2778

Rev 2773		Rev 2778
1	#	1	#
2	# Copyright (c) 2008 Josef Cejka	2	# Copyright (c) 2008 Josef Cejka
3	# All rights reserved.	3	# All rights reserved.
4	#	4	#
5	# Redistribution and use in source and binary forms, with or without	5	# Redistribution and use in source and binary forms, with or without
6	# modification, are permitted provided that the following conditions	6	# modification, are permitted provided that the following conditions
7	# are met:	7	# are met:
8	#	8	#
9	# - Redistributions of source code must retain the above copyright	9	# - Redistributions of source code must retain the above copyright
10	# notice, this list of conditions and the following disclaimer.	10	# notice, this list of conditions and the following disclaimer.
11	# - Redistributions in binary form must reproduce the above copyright	11	# - Redistributions in binary form must reproduce the above copyright
12	# notice, this list of conditions and the following disclaimer in the	12	# notice, this list of conditions and the following disclaimer in the
13	# documentation and/or other materials provided with the distribution.	13	# documentation and/or other materials provided with the distribution.
14	# - The name of the author may not be used to endorse or promote products	14	# - The name of the author may not be used to endorse or promote products
15	# derived from this software without specific prior written permission.	15	# derived from this software without specific prior written permission.
16	#	16	#
17	# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR	17	# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18	# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES	18	# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19	# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.	19	# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20	# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,	20	# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21	# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT	21	# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22	# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,	22	# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23	# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY	23	# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24	# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT	24	# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25	# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF	25	# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26	# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.	26	# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27	#	27	#
28		28
29	#include <kernel/arch/context_offset.h>	29	#include <kernel/arch/context_offset.h>
30		30
31	.text	31	.text
32	.global setjmp	32	.global setjmp
33	.global longjmp	33	.global longjmp
34		34
35	.type setjmp,@function	35	.type setjmp,@function
36	setjmp:	36	setjmp:
37	movl 0(%esp),%eax # save pc value into eax	37	movl 0(%esp),%eax # save pc value into eax
38	movl 4(%esp),%edx # address of the context variable to save context to	38	movl 4(%esp),%edx # address of the jmp_buf structure to save context to
39		39
40	# save registers to given structure	40	# save registers to the jmp_buf structure
41	CONTEXT_SAVE_ARCH_CORE %edx %eax	41	CONTEXT_SAVE_ARCH_CORE %edx %eax
42		42
43	xorl %eax,%eax # set_jmp returns 0	43	xorl %eax,%eax # set_jmp returns 0
44	ret	44	ret
45		45
46	.type longjmp,@function	46	.type longjmp,@function
47	longjmp:	47	longjmp:
48		48
49	movl 4(%esp), %ecx # put address of jmp_buf into ecx	49	movl 4(%esp), %ecx # put address of jmp_buf into ecx
50	movl 8(%esp), %eax # put return value into eax	50	movl 8(%esp), %eax # put return value into eax
51		51
52	# restore registers from jmp_buf	52	# restore registers from the jmp_buf structure
53	CONTEXT_RESTORE_ARCH_CORE %ecx %edx	53	CONTEXT_RESTORE_ARCH_CORE %ecx %edx
54		54
55	movl %edx,0(%esp) # put saved pc on stack	55	movl %edx,0(%esp) # put saved pc on stack
56	ret	56	ret
57		57
58		58