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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>
84 lines
2.1 KiB
ArmAsm
84 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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/* clone() is even more special than fork() as it mucks with stacks
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and invokes a function in the right context after its all over. */
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#include <sysdep.h>
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#include <tcb-offsets.h>
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#define _ERRNO_H 1
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#include <bits/errno.h>
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/* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg,
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pid_t *ptid, struct user_desc *tls, pid_t *ctid); */
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.text
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ENTRY(__clone)
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@ sanity check args
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cmp r0, #0
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@ align sp
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and r1, r1, #-8
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ite ne
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cmpne r1, #0
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moveq r0, #-EINVAL
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beq PLTJMP(syscall_error)
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@ insert the args onto the new stack
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str r3, [r1, #-4]!
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str r0, [r1, #-4]!
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@ do the system call
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@ get flags
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mov r0, r2
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mov ip, r2
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@ new sp is already in r1
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push {r4, r7}
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cfi_adjust_cfa_offset (8)
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cfi_rel_offset (r4, 0)
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cfi_rel_offset (r7, 4)
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ldr r2, [sp, #8]
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ldr r3, [sp, #12]
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ldr r4, [sp, #16]
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ldr r7, =SYS_ify(clone)
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swi 0x0
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cfi_endproc
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cmp r0, #0
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beq 1f
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pop {r4, r7}
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blt PLTJMP(C_SYMBOL_NAME(__syscall_error))
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RETINSTR(, lr)
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cfi_startproc
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PSEUDO_END (__clone)
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1:
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.fnstart
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.cantunwind
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@ pick the function arg and call address off the stack and execute
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ldr r0, [sp, #4]
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ldr ip, [sp], #8
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BLX (ip)
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@ and we are done, passing the return value through r0
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ldr r7, =SYS_ify(exit)
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swi 0x0
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.fnend
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libc_hidden_def (__clone)
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weak_alias (__clone, clone)
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