mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-01 17:30:07 +00:00
70 lines
2.1 KiB
ArmAsm
70 lines
2.1 KiB
ArmAsm
/* Copyright (C) 1996-2024 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 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, see
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#include <sysdep.h>
|
|
|
|
/*
|
|
* This is for COMPATIBILITY with Linux/x86 only. Linux/Alpha system
|
|
* calls return an error indication in a3. This allows arbitrary 64bit
|
|
* values to be returned in v0 (because negative values are not
|
|
* mistaken as error numbers). However, C allows only one value to
|
|
* be returned, 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, arg6)
|
|
*
|
|
* syscall_number = the index of the system call we're invoking
|
|
* arg1-arg6 = up to 6 integer arguments to the system call
|
|
*
|
|
* We need to do some arg shifting: the kernel expects the
|
|
* syscall number in v0 and the first six args in a0-a5.
|
|
*
|
|
*/
|
|
|
|
|
|
LEAF(__syscall, 0)
|
|
#ifdef PROF
|
|
ldgp gp, 0(pv)
|
|
.set noat
|
|
lda AT, _mcount
|
|
jsr AT, (AT), _mcount
|
|
.set at
|
|
.prologue 1
|
|
#else
|
|
.prologue 0
|
|
#endif
|
|
|
|
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
|
|
ldq a5,0(sp) /* arg6 -> a5 */
|
|
|
|
call_pal PAL_callsys /* Invoke system call */
|
|
bne a3, SYSCALL_ERROR_LABEL
|
|
ret
|
|
|
|
PSEUDO_END(__syscall)
|
|
|
|
weak_alias (__syscall, syscall)
|