1 /* Copyright (C) 1998, 2003, 2004 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Richard Henderson <rth@cygnus.com>, 1998
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <http://www.gnu.org/licenses/>. */
20 #include <sys/syscall.h>
21 #include <sys/regdef.h>
23 /* On Alpha we desparately want to avoid having to issue an imb. Ordinarily
24 the kernel would have to issue one after setting up the signal return
25 stack, but the Linux rt_sigaction syscall is prepared to accept a pointer
26 to the sigreturn syscall, instead of inlining it on the stack.
28 This just about halves signal delivery time. */
32 .globl __syscall_rt_sigaction
33 #ifndef __UCLIBC_HAS_THREADS_NATIVE__
34 .hidden __syscall_rt_sigaction
37 .ent __syscall_rt_sigaction, 0
38 __syscall_rt_sigaction:
44 ldl t0, 8(a1) # sa_flags
46 /* The unwinder will subtract one from the return address when
47 attempting to find the call instruction that led us here.
48 Since we didn't get here via a normal call, if we do nothing
49 we would pick up the wrong symbol and the wrong FDE. Account
50 for this by adding a nop to the start of the function and
51 then skipping it here by adding 4. */
52 ldah a4, __syscall_sigreturn+4(gp) !gprelhigh
53 ldah t1, __syscall_rt_sigreturn+4(gp) !gprelhigh
54 lda a4, __syscall_sigreturn+4(a4) !gprellow
55 lda t1, __syscall_rt_sigreturn+4(t1) !gprellow
56 and t0, 0x40, t0 # SA_SIGINFO
59 0: ldi v0, __NR_rt_sigaction
65 jmp zero,__syscall_error
67 .end __syscall_rt_sigaction
72 ldi v0, __NR_sigreturn
74 .size __syscall_sigreturn, .-__syscall_sigreturn
75 .type __syscall_sigreturn, @function
77 __syscall_rt_sigreturn:
80 ldi v0,__NR_rt_sigreturn
82 .size __syscall_rt_sigreturn, .-__syscall_rt_sigreturn
83 .type __syscall_rt_sigreturn, @function