mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-16 01:50:11 +00:00
23e50ece45
2004-01-15 Richard Henderson <rth@redhat.com> * sysdeps/unix/sysv/linux/alpha/rt_sigaction.S: Prefix stubs with __syscall_, move nop inside, adjust users by +4.
121 lines
3.4 KiB
ArmAsm
121 lines
3.4 KiB
ArmAsm
/* 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 <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
|
|
ldgp gp,0(pv)
|
|
#ifdef PROF
|
|
.set noat
|
|
lda AT, _mcount
|
|
jsr AT, (AT), _mcount
|
|
.set at
|
|
#endif
|
|
.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, SYSCALL_ERROR_LABEL
|
|
ret
|
|
|
|
PSEUDO_END(__syscall_rt_sigaction)
|
|
|
|
/* To enable unwinding through the signal frame without special hackery
|
|
elsewhere, describe the entire struct sigcontext with unwind info.
|
|
|
|
In order to minimize the size of the encoding, we set the CFA to the
|
|
end of the sigcontext, which makes all of the registers have small
|
|
negative offsets from that. */
|
|
|
|
.macro SIGCONTEXT_REGS_I base, from=0
|
|
cfi_offset (\from, \base + (4 + \from) * 8)
|
|
.if 30-\from
|
|
SIGCONTEXT_REGS_I \base, "(\from+1)"
|
|
.endif
|
|
.endm
|
|
|
|
.macro SIGCONTEXT_REGS_F base, from=32
|
|
cfi_offset (\from, \base + (4 + 1 + \from) * 8)
|
|
.if 62-\from
|
|
SIGCONTEXT_REGS_F \base, "(\from+1)"
|
|
.endif
|
|
.endm
|
|
|
|
.macro SIGCONTEXT_REGS base
|
|
SIGCONTEXT_REGS_I \base
|
|
SIGCONTEXT_REGS_F \base
|
|
cfi_offset (63, \base + (4 + 32 + 1 + 32) * 8)
|
|
cfi_offset (64, \base + 2 * 8)
|
|
.endm
|
|
|
|
.align 4
|
|
nop
|
|
nop
|
|
nop
|
|
|
|
cfi_startproc
|
|
cfi_return_column (64)
|
|
SIGCONTEXT_REGS -648
|
|
|
|
cfi_def_cfa_offset (648)
|
|
__syscall_sigreturn:
|
|
nop
|
|
mov sp, a0
|
|
ldi v0, __NR_sigreturn
|
|
callsys
|
|
.size __syscall_sigreturn, .-__syscall_sigreturn
|
|
.type __syscall_sigreturn, @function
|
|
|
|
cfi_def_cfa_offset (176 + 648)
|
|
__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
|
|
|
|
cfi_endproc
|