mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-26 23:10:06 +00:00
2b778ceb40
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 6694 files FOO. I then removed trailing white space from benchtests/bench-pthread-locks.c and iconvdata/tst-iconv-big5-hkscs-to-2ucs4.c, to work around this diagnostic from Savannah: remote: *** pre-commit check failed ... remote: *** error: lines with trailing whitespace found remote: error: hook declined to update refs/heads/master
92 lines
2.6 KiB
ArmAsm
92 lines
2.6 KiB
ArmAsm
/* Wrapper around clone system call. RISC-V version.
|
|
Copyright (C) 1996-2021 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/>. */
|
|
|
|
/* clone() is even more special than fork() as it mucks with stacks
|
|
and invokes a function in the right context after its all over. */
|
|
|
|
#include <sys/asm.h>
|
|
#include <sysdep.h>
|
|
#define _ERRNO_H 1
|
|
#include <bits/errno.h>
|
|
#include <tls.h>
|
|
#include "tcb-offsets.h"
|
|
|
|
/* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg,
|
|
void *parent_tidptr, void *tls, void *child_tidptr) */
|
|
|
|
.text
|
|
LEAF (__clone)
|
|
|
|
/* Sanity check arguments. */
|
|
beqz a0,L (invalid) /* No NULL function pointers. */
|
|
beqz a1,L (invalid) /* No NULL stack pointers. */
|
|
|
|
addi a1,a1,-16 /* Reserve argument save space. */
|
|
REG_S a0,0(a1) /* Save function pointer. */
|
|
REG_S a3,SZREG(a1) /* Save argument pointer. */
|
|
|
|
/* The syscall expects the args to be in different slots. */
|
|
mv a0,a2
|
|
mv a2,a4
|
|
mv a3,a5
|
|
mv a4,a6
|
|
|
|
/* Do the system call. */
|
|
li a7,__NR_clone
|
|
scall
|
|
|
|
bltz a0,L (error)
|
|
beqz a0,L (thread_start)
|
|
|
|
/* Successful return from the parent. */
|
|
ret
|
|
|
|
L (invalid):
|
|
li a0, -EINVAL
|
|
/* Something bad happened -- no child created. */
|
|
L (error):
|
|
j __syscall_error
|
|
END (__clone)
|
|
|
|
/* Load up the arguments to the function. Put this block of code in
|
|
its own function so that we can terminate the stack trace with our
|
|
debug info. */
|
|
|
|
ENTRY (__thread_start)
|
|
L (thread_start):
|
|
/* Terminate call stack by noting ra is undefined. Use a dummy
|
|
.cfi_label to force starting the FDE. */
|
|
.cfi_label .Ldummy
|
|
cfi_undefined (ra)
|
|
|
|
/* Restore the arg for user's function. */
|
|
REG_L a1,0(sp) /* Function pointer. */
|
|
REG_L a0,SZREG(sp) /* Argument pointer. */
|
|
|
|
/* Call the user's function. */
|
|
jalr a1
|
|
|
|
/* Call exit with the function's return value. */
|
|
li a7, __NR_exit
|
|
scall
|
|
|
|
END (__thread_start)
|
|
|
|
libc_hidden_def (__clone)
|
|
weak_alias (__clone, clone)
|