1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
|
/* Copyright (C) 1998 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Richard Henderson <rth@cygnus.com>, 1998
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include <sysdep.h>
/* On Alpha we desparately want to avoid having to issue an imb. Ordinarily
the kernel would have to issue one after setting up the signal return
stack, but the Linux rt_sigaction syscall is prepared to accept a pointer
to the sigreturn syscall, instead of inlining it on the stack.
This just about halves signal delivery time. */
#ifdef __NR_rt_sigaction
.text
ENTRY(__syscall_rt_sigaction)
.frame sp,0,ra,0
#ifdef PROF
ldgp gp,0(pv)
.set noat
lda AT, _mcount
jsr AT, (AT), _mcount
.set at
#endif
/* Indicate non-standard use of our PV. */
.prologue 2
beq a1, 0f
ldl t0, 8(a1) # sa_flags
lda a4, sigreturn-__syscall_rt_sigaction(pv)
lda t1, rt_sigreturn-__syscall_rt_sigaction(pv)
and t0, 0x00000040, t0 # SA_SIGINFO
cmovne t0, t1, a4
0: ldi v0,__NR_rt_sigaction
callsys
bne a3,1f
ret
1:
#ifndef PROF
br gp,2f
2: ldgp gp,0(gp)
#endif
jmp __syscall_error
END(__syscall_rt_sigaction)
.align 5
.ent sigreturn
sigreturn:
.prologue 0
mov sp,a0
ldi v0,__NR_sigreturn
callsys
.end sigreturn
.align 4
.ent rt_sigreturn
rt_sigreturn:
.prologue 0
mov sp,a0
ldi v0,__NR_rt_sigreturn
callsys
.end rt_sigreturn
#else
ENTRY(__syscall_rt_sigaction)
ldgp $29,0($27)
.prologue 1
ldi $0,ENOSYS
jmp __syscall_error
END(__syscall_rt_sigaction)
#endif
|
