1/* libunwind - a platform-independent unwind library
2   Copyright (C) 2004 Hewlett-Packard Co
3	Contributed by David Mosberger-Tang <davidm@hpl.hp.com>
4   Copyright (C) 2011 Konstantin Belousov <kib@FreeBSD.org>
5
6This file is part of libunwind.
7
8Permission is hereby granted, free of charge, to any person obtaining
9a copy of this software and associated documentation files (the
10"Software"), to deal in the Software without restriction, including
11without limitation the rights to use, copy, modify, merge, publish,
12distribute, sublicense, and/or sell copies of the Software, and to
13permit persons to whom the Software is furnished to do so, subject to
14the following conditions:
15
16The above copyright notice and this permission notice shall be
17included in all copies or substantial portions of the Software.
18
19THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
20EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
21MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
22NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
23LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
24OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
25WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.  */
26
27	.globl _UI_siglongjmp_cont
28
29#if defined(__linux__)
30#define SIG_SETMASK 2
31#elif defined(__FreeBSD__)
32#define SIG_SETMASK 3
33#endif
34
35	/* Stack layout at this point:
36
37		+------------+ <- original $esp (at time of setjmp() call)
38		| sigmask[1] |
39		+------------+
40		| sigmask[0] |
41		+------------+
42	 */
43
44	.type _UI_siglongjmp_cont, @function
45_UI_siglongjmp_cont:
46	.cfi_startproc
47#ifdef __linux__
48	.cfi_register 8, 0	/* IP saved in EAX */
49	.cfi_def_cfa_offset 8
50	mov %esp, %ecx		/* pass address of signal mask in 3rd sc arg */
51	push %eax		/* save target IP */
52	.cfi_adjust_cfa_offset 4
53	.cfi_offset 8, -12
54	push %edx		/* save return value */
55	.cfi_adjust_cfa_offset 4
56	push %ebx		/* save %ebx (preserved) */
57	.cfi_adjust_cfa_offset 4
58	.cfi_offset 3, -20
59	mov $SIG_SETMASK, %ebx	/* 1st syscall arg (how) */
60	xor %edx, %edx		/* pass NULL as 3rd syscall arg (old maskp) */
61	int $0x80
62	pop %ebx		/* restore %ebx */
63	.cfi_adjust_cfa_offset -4
64	.cfi_restore 3
65	pop %eax		/* fetch return value */
66	.cfi_adjust_cfa_offset -4
67	pop %edx		/* pop target IP */
68	.cfi_adjust_cfa_offset -4
69	.cfi_register 8, 2	/* saved IP is now n EDX */
70	lea 8(%esp), %esp	/* pop sigmask */
71	.cfi_adjust_cfa_offset -4
72	jmp *%edx
73#elif defined(__FreeBSD__)
74	pushl	%eax
75	pushl	%edx
76	pushl	$0
77	pushl	%ecx
78	pushl	$SIG_SETMASK
79	movl	$340,%eax
80	pushl	%eax
81	int	$0x80
82	addl	$16,%esp
83	popl	%eax
84	popl	%edx
85	jmp	*%edx
86#else
87#error Port me
88#endif
89	.cfi_endproc
90	.size _UI_siglongjmp_cont, .-_UI_siglongjmp_cont
91	/* We do not need executable stack.  */
92	.section	.note.GNU-stack,"",@progbits
93