diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/alpha/syscall.S')
| -rw-r--r-- | sysdeps/unix/sysv/linux/alpha/syscall.S | 77 |
1 files changed, 0 insertions, 77 deletions
diff --git a/sysdeps/unix/sysv/linux/alpha/syscall.S b/sysdeps/unix/sysv/linux/alpha/syscall.S deleted file mode 100644 index 0c4081363a..0000000000 --- a/sysdeps/unix/sysv/linux/alpha/syscall.S +++ /dev/null @@ -1,77 +0,0 @@ -/* Copyright (C) 1996 Free Software Foundation, Inc. - This file is part of the GNU C Library. - Contributed by David Mosberger <davidm@azstarnet.com>, 1996. - - 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> - -/* - * 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) - * - * 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) -#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 - - call_pal PAL_callsys /* Invoke system call */ - bne a3, $error - ret - -$error: -#ifndef PROF - br gp, 2f -2: ldgp gp, 0(gp) -#endif - SYSCALL_ERROR_HANDLER - -END(__syscall) - -weak_alias (__syscall, syscall) |