mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-29 16:21:07 +00:00
80 lines
2.1 KiB
ArmAsm
80 lines
2.1 KiB
ArmAsm
/* The clone3 syscall wrapper. Linux/RISC-V version.
|
|
Copyright (C) 2023-2024 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 <asm/errno.h>
|
|
#include <sys/asm.h>
|
|
#include <sysdep.h>
|
|
|
|
/* The userland implementation is:
|
|
int clone3 (struct clone_args *cl_args, size_t size,
|
|
int (*func)(void *arg), void *arg);
|
|
|
|
the kernel entry is:
|
|
int clone3 (struct clone_args *cl_args, size_t size);
|
|
|
|
The parameters are passed in registers from userland:
|
|
a0: cl_args
|
|
a1: size
|
|
a2: func
|
|
a3: arg */
|
|
|
|
.text
|
|
ENTRY(__clone3)
|
|
/* Sanity check args. */
|
|
beqz a0, L(invalid) /* No NULL cl_args pointer. */
|
|
beqz a2, L(invalid) /* No NULL function pointer. */
|
|
|
|
/* Do the system call, the kernel expects:
|
|
a7: system call number
|
|
a0: cl_args
|
|
a1: size */
|
|
li a7, __NR_clone3
|
|
scall
|
|
|
|
bltz a0, L(error)
|
|
beqz a0, L(thread_start)
|
|
|
|
ret
|
|
|
|
L(invalid):
|
|
li a0, -EINVAL
|
|
L(error):
|
|
tail __syscall_error
|
|
END (__clone3)
|
|
|
|
ENTRY(__thread_start_clone3)
|
|
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 and call the user's
|
|
function. */
|
|
mv a0, a3 /* Argument pointer. */
|
|
jalr a2
|
|
|
|
/* Call exit with the function's return value. */
|
|
li a7, __NR_exit
|
|
scall
|
|
END(__thread_start_clone3)
|
|
|
|
libc_hidden_def (__clone3)
|
|
weak_alias (__clone3, clone3)
|