glibc/sysdeps/unix/sysv/linux/alpha/syscall.S

70 lines
2.1 KiB
ArmAsm
Raw Normal View History

/* Copyright (C) 1996-2021 Free Software Foundation, Inc.
1996-11-20 03:45:46 +00:00
This file is part of the GNU C Library.
1996-11-20 03:45:46 +00:00
The GNU C Library is free software; you can redistribute it and/or
2001-07-06 04:56:23 +00:00
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.
1996-11-20 03:45:46 +00:00
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
2001-07-06 04:56:23 +00:00
Lesser General Public License for more details.
2001-07-06 04:56:23 +00:00
You should have received a copy of the GNU Lesser General Public
2012-03-09 23:56:38 +00:00
License along with the GNU C Library. If not, see
Prefer https to http for gnu.org and fsf.org URLs Also, change sources.redhat.com to sourceware.org. This patch was automatically generated by running the following shell script, which uses GNU sed, and which avoids modifying files imported from upstream: sed -ri ' s,(http|ftp)(://(.*\.)?(gnu|fsf|sourceware)\.org($|[^.]|\.[^a-z])),https\2,g s,(http|ftp)(://(.*\.)?)sources\.redhat\.com($|[^.]|\.[^a-z]),https\2sourceware.org\4,g ' \ $(find $(git ls-files) -prune -type f \ ! -name '*.po' \ ! -name 'ChangeLog*' \ ! -path COPYING ! -path COPYING.LIB \ ! -path manual/fdl-1.3.texi ! -path manual/lgpl-2.1.texi \ ! -path manual/texinfo.tex ! -path scripts/config.guess \ ! -path scripts/config.sub ! -path scripts/install-sh \ ! -path scripts/mkinstalldirs ! -path scripts/move-if-change \ ! -path INSTALL ! -path locale/programs/charmap-kw.h \ ! -path po/libc.pot ! -path sysdeps/gnu/errlist.c \ ! '(' -name configure \ -execdir test -f configure.ac -o -f configure.in ';' ')' \ ! '(' -name preconfigure \ -execdir test -f preconfigure.ac ';' ')' \ -print) and then by running 'make dist-prepare' to regenerate files built from the altered files, and then executing the following to cleanup: chmod a+x sysdeps/unix/sysv/linux/riscv/configure # Omit irrelevant whitespace and comment-only changes, # perhaps from a slightly-different Autoconf version. git checkout -f \ sysdeps/csky/configure \ sysdeps/hppa/configure \ sysdeps/riscv/configure \ sysdeps/unix/sysv/linux/csky/configure # Omit changes that caused a pre-commit check to fail like this: # remote: *** error: sysdeps/powerpc/powerpc64/ppc-mcount.S: trailing lines git checkout -f \ sysdeps/powerpc/powerpc64/ppc-mcount.S \ sysdeps/unix/sysv/linux/s390/s390-64/syscall.S # Omit change that caused a pre-commit check to fail like this: # remote: *** error: sysdeps/sparc/sparc64/multiarch/memcpy-ultra3.S: last line does not end in newline git checkout -f sysdeps/sparc/sparc64/multiarch/memcpy-ultra3.S
2019-09-07 05:40:42 +00:00
<https://www.gnu.org/licenses/>. */
#include <sysdep.h>
/*
* This is for COMPATIBILITY with Linux/x86 only. Linux/Alpha system
2013-06-05 20:26:40 +00:00
* 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:
*
2012-02-16 00:27:55 +00:00
* long syscall(syscall_number, arg1, arg2, arg3, arg4, arg5, arg6)
*
* syscall_number = the index of the system call we're invoking
2012-02-16 00:27:55 +00:00
* arg1-arg6 = up to 6 integer arguments to the system call
*
* We need to do some arg shifting: the kernel expects the
2012-02-16 00:27:55 +00:00
* syscall number in v0 and the first six args in a0-a5.
*
*/
LEAF(__syscall, 0)
1996-11-07 01:34:35 +00:00
#ifdef PROF
ldgp gp, 0(pv)
1996-11-20 03:45:46 +00:00
.set noat
1996-11-07 01:34:35 +00:00
lda AT, _mcount
jsr AT, (AT), _mcount
1996-11-20 03:45:46 +00:00
.set at
1996-11-07 01:34:35 +00:00
.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
2012-02-16 00:27:55 +00:00
ldq a5,0(sp) /* arg6 -> a5 */
call_pal PAL_callsys /* Invoke system call */
bne a3, SYSCALL_ERROR_LABEL
ret
PSEUDO_END(__syscall)
1996-11-20 03:45:46 +00:00
2005-05-26 14:30:48 +00:00
weak_alias (__syscall, syscall)