mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-19 11:30:06 +00:00
9b2446e825
1999-04-14 Scott Bambrough <scottb@netwinder.org> * sysdeps/unix/sysv/linux/arm/socket.S: Socket calls could not be restarted after being interrupted by a signal. The parameters on the stack were corrupted by the signal handler. * sysdeps/unix/sysv/linux/arm/mmap.S: mmap calls could not be restarted after being interrupted by a signal. The parameters on the stack were corrupted by the signal handler.
57 lines
1.9 KiB
ArmAsm
57 lines
1.9 KiB
ArmAsm
/* Copyright (C) 1998 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
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>
|
|
|
|
.text
|
|
|
|
ENTRY (__mmap)
|
|
|
|
/* Because we can only get five args through the syscall interface, and
|
|
mmap() takes six, we need to build a parameter block and pass its
|
|
address instead. The 386 port does a similar trick. */
|
|
|
|
/* This code previously moved sp into ip and stored the args using
|
|
stmdb ip!, {a1-a4}. It did not modify sp, so the stack never had
|
|
to be restored after the syscall completed. It saved an
|
|
instruction and meant no stack cleanup work was required.
|
|
|
|
This will not work in the case of a mmap call being interrupted
|
|
by a signal. If the signal handler uses any stack the arguments
|
|
to mmap will be trashed. The results of a restart of mmap are
|
|
then unpredictable. */
|
|
|
|
/* store args on the stack */
|
|
stmdb sp!, {a1-a4}
|
|
|
|
/* do the syscall */
|
|
mov a1, sp
|
|
swi SYS_ify (mmap)
|
|
|
|
/* pop args off the stack. */
|
|
add sp, sp, #16
|
|
|
|
cmn r0, $4096
|
|
bhs PLTJMP(syscall_error);
|
|
ret
|
|
|
|
PSEUDO_END (__mmap)
|
|
|
|
weak_alias (__mmap, mmap)
|
|
weak_alias (__mmap, mmap64)
|