mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-30 08:40:07 +00:00
581c785bf3
I used these shell commands: ../glibc/scripts/update-copyrights $PWD/../gnulib/build-aux/update-copyright (cd ../glibc && git commit -am"[this commit message]") and then ignored the output, which consisted lines saying "FOO: warning: copyright statement not found" for each of 7061 files FOO. I then removed trailing white space from math/tgmath.h, support/tst-support-open-dev-null-range.c, and sysdeps/x86_64/multiarch/strlen-vec.S, to work around the following obscure pre-commit check failure diagnostics from Savannah. I don't know why I run into these diagnostics whereas others evidently do not. remote: *** 912-#endif remote: *** 913: remote: *** 914- remote: *** error: lines with trailing whitespace found ... remote: *** error: sysdeps/unix/sysv/linux/statx_cp.c: trailing lines
93 lines
3.0 KiB
ArmAsm
93 lines
3.0 KiB
ArmAsm
/* clone() implementation for ARC.
|
|
Copyright (C) 2020-2022 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
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, see
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
|
|
#include <sysdep.h>
|
|
#define _ERRNO_H 1
|
|
#include <bits/errno.h>
|
|
#include <tcb-offsets.h>
|
|
|
|
#define CLONE_SETTLS 0x00080000
|
|
|
|
/* int clone(int (*fn)(void *), void *child_stack,
|
|
int flags, void *arg, ...
|
|
< pid_t *ptid, struct user_desc *tls, pid_t *ctid > );
|
|
|
|
NOTE: I'm assuming that the last 3 args are NOT var-args and in case all
|
|
3 are not relevant, caller will nevertheless pass those as NULL.
|
|
|
|
clone syscall in kernel (ABI: CONFIG_CLONE_BACKWARDS)
|
|
|
|
int sys_clone(unsigned long int clone_flags,
|
|
unsigned long int newsp,
|
|
int __user *parent_tidptr,
|
|
void *tls,
|
|
int __user *child_tidptr). */
|
|
|
|
ENTRY (__clone)
|
|
cmp r0, 0 /* @fn can't be NULL. */
|
|
cmp.ne r1, 0 /* @child_stack can't be NULL. */
|
|
bz L (__sys_err)
|
|
|
|
/* save some of the orig args
|
|
r0 containg @fn will be clobbered AFTER syscall (with ret val)
|
|
rest are clobbered BEFORE syscall due to different arg ordering. */
|
|
mov r10, r0 /* @fn. */
|
|
mov r11, r3 /* @args. */
|
|
mov r12, r2 /* @clone_flags. */
|
|
mov r9, r5 /* @tls. */
|
|
|
|
/* adjust libc args for syscall. */
|
|
|
|
mov r0, r2 /* libc @flags is 1st syscall arg. */
|
|
mov r2, r4 /* libc @ptid. */
|
|
mov r3, r5 /* libc @tls. */
|
|
mov r4, r6 /* libc @ctid. */
|
|
mov r8, __NR_clone
|
|
ARC_TRAP_INSN
|
|
|
|
cmp r0, 0 /* return code : 0 new process, !0 parent. */
|
|
blt L (__sys_err2) /* < 0 (signed) error. */
|
|
jnz [blink] /* Parent returns. */
|
|
|
|
/* child jumps off to @fn with @arg as argument
|
|
TP register already set by kernel. */
|
|
jl.d [r10]
|
|
mov r0, r11
|
|
|
|
/* exit() with result from @fn (already in r0). */
|
|
mov r8, __NR_exit
|
|
ARC_TRAP_INSN
|
|
/* In case it ever came back. */
|
|
flag 1
|
|
|
|
L (__sys_err):
|
|
mov r0, -EINVAL
|
|
L (__sys_err2):
|
|
/* (1) No need to make -ve kernel error code as positive errno
|
|
__syscall_error expects the -ve error code returned by kernel
|
|
(2) r0 still had orig -ve kernel error code
|
|
(3) Tail call to __syscall_error so we dont have to come back
|
|
here hence instead of jmp-n-link (reg push/pop) we do jmp
|
|
(4) No need to route __syscall_error via PLT, B is inherently
|
|
position independent. */
|
|
b __syscall_error
|
|
PSEUDO_END (__clone)
|
|
libc_hidden_def (__clone)
|
|
weak_alias (__clone, clone)
|