glibc/sysdeps/unix/sysv/linux/alpha/syscall.S
Andreas Jaeger e8b1163ed0 2000-03-09 Martin Buchholz <martin@xemacs.org>
* sysdeps/unix/sysv/linux/alpha/syscall.S:
	* manual/message.texi (Using gettextized software):
	* manual/message.texi (Message Translation): Doc Fixes.
	* manual/filesys.texi (File Size):
	* manual/charset.texi (glibc iconv Implementation):
	* locale/programs/ld-collate.c (collate_output):
	* iconv/gconv_db.c (find_derivation):
	* manual/install.texi:
	* manual/search.texi (Hash Search Function):
	* manual/stdio.texi (Output Conversion Syntax):
	* FAQ.in:
	* config.h.in:
	* sysdeps/generic/dl-sysdep.c:
	Doc Fixes.  `allows to' is not correct English.

	* elf/rtld.c: Doc fixes.
	* manual/creature.texi (Feature Test Macros): Doc fixes.
	* manual/memory.texi (Hooks for Malloc): Doc Fixes.

	* manual/filesys.texi (Working Directory): Check for ERANGE to
	avoid infloop.
2000-03-10 08:41:39 +00:00

78 lines
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ArmAsm

/* 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 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>
/*
* 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
jmp zero, __syscall_error
END(__syscall)
weak_alias(__syscall, syscall)