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/* Copyright (C) 1998, 2003, 2004 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 Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <features.h>
#include <sys/syscall.h>
#include <asm/regdef.h>
#include <asm/pal.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
.globl __syscall_rt_sigaction
.align 4
.ent __syscall_rt_sigaction, 0
__syscall_rt_sigaction:
.frame sp,0,ra,0
ldgp gp,0(pv)
.prologue 1
beq a1, 0f
ldl t0, 8(a1) # sa_flags
/* The unwinder will subtract one from the return address when
attempting to find the call instruction that led us here.
Since we didn't get here via a normal call, if we do nothing
we would pick up the wrong symbol and the wrong FDE. Account
for this by adding a nop to the start of the function and
then skipping it here by adding 4. */
ldah a4, __syscall_sigreturn+4(gp) !gprelhigh
ldah t1, __syscall_rt_sigreturn+4(gp) !gprelhigh
lda a4, __syscall_sigreturn+4(a4) !gprellow
lda t1, __syscall_rt_sigreturn+4(t1) !gprellow
and t0, 0x40, t0 # SA_SIGINFO
cmovne t0, t1, a4
0: ldi v0, __NR_rt_sigaction
callsys
bne a3, $error
ret
$error:
jmp zero,__syscall_error
.end __syscall_rt_sigaction
__syscall_sigreturn:
nop
mov sp, a0
ldi v0, __NR_sigreturn
callsys
.size __syscall_sigreturn, .-__syscall_sigreturn
.type __syscall_sigreturn, @function
__syscall_rt_sigreturn:
nop
mov sp,a0
ldi v0,__NR_rt_sigreturn
callsys
.size __syscall_rt_sigreturn, .-__syscall_rt_sigreturn
.type __syscall_rt_sigreturn, @function
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