mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-03 10:21:05 +00:00
07f03a4d38
* sysdeps/unix/sysv/linux/alpha/sysdep.S, sysdeps/unix/sysv/linux/alpha/brk.S, sysdeps/unix/sysv/linux/alpha/ieee_get_fp_control.S, sysdeps/unix/sysv/linux/alpha/ieee_set_fp_control.S, sysdeps/unix/sysv/linux/alpha/llseek.S, sysdeps/unix/sysv/linux/alpha/sigsuspend.S, sysdeps/unix/sysv/linux/alpha/syscall.S: Rename syscall_error to __syscall_error to avoid intruding application name space.
61 lines
2.0 KiB
ArmAsm
61 lines
2.0 KiB
ArmAsm
/* Copyright (C) 1996 Free Software Foundation, Inc.
|
|
Contributed by David Mosberger (davidm@azstarnet.com).
|
|
|
|
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., 675 Mass Ave,
|
|
Cambridge, MA 02139, USA. */
|
|
|
|
#include <sysdep.h>
|
|
|
|
/*
|
|
* This is for COMPATIBILITY with Linux/x86 only. Linux/Alpha system
|
|
* calls return an error indication in a3. This allows to return
|
|
* arbitrary 64bit values in v0 (because negative values are not
|
|
* mistaken as error numbers). However, C allows to return only one
|
|
* value so the interface below folds the error indication passed in
|
|
* a3 back into v0: it sets v0 to -errno if an error occurs. Thus,
|
|
* no negative 64bit numbers can be returned. To avoid this problem,
|
|
* use assembly stubs wherever possible/convenient.
|
|
*
|
|
* Usage:
|
|
*
|
|
* long syscall(syscall_number, arg1, arg2, arg3, arg4, arg5)
|
|
*
|
|
* syscall_number = the index of the system call we're invoking
|
|
* arg1-arg5 = up to 5 integer arguments to the system call
|
|
*
|
|
* We need to do some arg shifting: the kernel expects the
|
|
* syscall number in v0 and the first five args in a0-a4.
|
|
*
|
|
*/
|
|
|
|
|
|
LEAF(__syscall, 0)
|
|
mov a0, v0 /* Syscall number -> v0 */
|
|
mov a1, a0 /* arg1-arg5 -> a0-a4 */
|
|
mov a2, a1
|
|
mov a3, a2
|
|
mov a4, a3
|
|
mov a5, a4
|
|
|
|
call_pal PAL_callsys /* Invoke system call */
|
|
bne a3, error
|
|
ret
|
|
|
|
error: br gp, 2f
|
|
2: ldgp gp, 0(gp)
|
|
jmp zero, __syscall_error
|
|
|
|
weak_alias(__syscall, syscall)
|