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/* The clone3 syscall wrapper. Linux/arm 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 <sysdep.h>
#define _ERRNO_H 1
#include <bits/errno.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:
r0: cl_args
r1: size
r2: func
r3: arg */
.text
ENTRY(__clone3)
/* Sanity check args. */
cmp r0, #0
ite ne
cmpne r1, #0
moveq r0, #-EINVAL
beq PLTJMP(syscall_error)
/* Do the syscall, the kernel expects:
r7: system call number:
r0: cl_args
r1: size */
push { r7 }
cfi_adjust_cfa_offset (4)
cfi_rel_offset (r7, 0)
ldr r7, =SYS_ify(clone3)
swi 0x0
cfi_endproc
cmp r0, #0
beq 1f
pop {r7}
blt PLTJMP(C_SYMBOL_NAME(__syscall_error))
RETINSTR(, lr)
cfi_startproc
PSEUDO_END (__clone3)
1:
.fnstart
.cantunwind
mov r0, r3
mov ip, r2
BLX (ip)
/* And we are done, passing the return value through r0. */
ldr r7, =SYS_ify(exit)
swi 0x0
.fnend
libc_hidden_def (__clone3)
weak_alias (__clone3, clone3)
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