diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/alpha/rt_sigaction.S')
| -rw-r--r-- | sysdeps/unix/sysv/linux/alpha/rt_sigaction.S | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/alpha/rt_sigaction.S b/sysdeps/unix/sysv/linux/alpha/rt_sigaction.S new file mode 100644 index 0000000000..bcb2be0e28 --- /dev/null +++ b/sysdeps/unix/sysv/linux/alpha/rt_sigaction.S @@ -0,0 +1,75 @@ +/* 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. */ + + + .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 + .prologue 1 + + beq a1, 0f + ldl t0, 8(a1) + 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_sigaction + callsys + bne a3,1f + ret + +1: br gp,2f +2: ldgp gp,0(gp) + 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 |