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30891f35fa
We stopped adding "Contributed by" or similar lines in sources in 2012 in favour of git logs and keeping the Contributors section of the glibc manual up to date. Removing these lines makes the license header a bit more consistent across files and also removes the possibility of error in attribution when license blocks or files are copied across since the contributed-by lines don't actually reflect reality in those cases. Move all "Contributed by" and similar lines (Written by, Test by, etc.) into a new file CONTRIBUTED-BY to retain record of these contributions. These contributors are also mentioned in manual/contrib.texi, so we just maintain this additional record as a courtesy to the earlier developers. The following scripts were used to filter a list of files to edit in place and to clean up the CONTRIBUTED-BY file respectively. These were not added to the glibc sources because they're not expected to be of any use in future given that this is a one time task: https://gist.github.com/siddhesh/b5ecac94eabfd72ed2916d6d8157e7dc https://gist.github.com/siddhesh/15ea1f5e435ace9774f485030695ee02 Reviewed-by: Carlos O'Donell <carlos@redhat.com>
70 lines
2.1 KiB
ArmAsm
70 lines
2.1 KiB
ArmAsm
/* Copyright (C) 1996-2021 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library. If not, see
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<https://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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/*
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* This is for COMPATIBILITY with Linux/x86 only. Linux/Alpha system
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* calls return an error indication in a3. This allows arbitrary 64bit
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* values to be returned in v0 (because negative values are not
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* mistaken as error numbers). However, C allows only one value to
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* be returned, so the interface below folds the error indication passed in
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* a3 back into v0: it sets v0 to -errno if an error occurs. Thus,
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* no negative 64bit numbers can be returned. To avoid this problem,
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* use assembly stubs wherever possible/convenient.
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*
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* Usage:
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*
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* long syscall(syscall_number, arg1, arg2, arg3, arg4, arg5, arg6)
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*
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* syscall_number = the index of the system call we're invoking
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* arg1-arg6 = up to 6 integer arguments to the system call
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*
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* We need to do some arg shifting: the kernel expects the
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* syscall number in v0 and the first six args in a0-a5.
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*
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*/
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LEAF(__syscall, 0)
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#ifdef PROF
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ldgp gp, 0(pv)
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.set noat
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lda AT, _mcount
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jsr AT, (AT), _mcount
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.set at
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.prologue 1
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#else
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.prologue 0
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#endif
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mov a0, v0 /* Syscall number -> v0 */
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mov a1, a0 /* arg1-arg5 -> a0-a4 */
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mov a2, a1
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mov a3, a2
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mov a4, a3
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mov a5, a4
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ldq a5,0(sp) /* arg6 -> a5 */
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call_pal PAL_callsys /* Invoke system call */
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bne a3, SYSCALL_ERROR_LABEL
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ret
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PSEUDO_END(__syscall)
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weak_alias (__syscall, syscall)
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