| /* Copyright (C) 1996-2018 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 |
| <http://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 <sysdep.h> |
| #define _ERRNO_H 1 |
| #include <bits/errno.h> |
| |
| /* int clone(int (*fn)(void *arg), x0 |
| void *child_stack, x1 |
| int flags, x2 |
| void *arg, x3 |
| pid_t *ptid, x4 |
| struct user_desc *tls, x5 |
| pid_t *ctid); x6 |
| */ |
| .text |
| ENTRY(__clone) |
| DELOUSE (0) |
| DELOUSE (1) |
| DELOUSE (2) |
| DELOUSE (3) |
| DELOUSE (4) |
| DELOUSE (5) |
| DELOUSE (6) |
| /* Save args for the child. */ |
| mov x10, x0 |
| mov x11, x2 |
| mov x12, x3 |
| |
| /* Sanity check args. */ |
| mov x0, #-EINVAL |
| cbz x10, .Lsyscall_error |
| cbz x1, .Lsyscall_error |
| |
| /* Do the system call. */ |
| /* X0:flags, x1:newsp, x2:parenttidptr, x3:newtls, x4:childtid. */ |
| mov x0, x2 /* flags */ |
| /* New sp is already in x1. */ |
| mov x2, x4 /* ptid */ |
| mov x3, x5 /* tls */ |
| mov x4, x6 /* ctid */ |
| mov x8, #SYS_ify(clone) |
| svc 0x0 |
| |
| cmp x0, #0 |
| beq thread_start |
| blt .Lsyscall_error |
| RET |
| PSEUDO_END (__clone) |
| |
| .align 4 |
| .type thread_start, %function |
| thread_start: |
| cfi_startproc |
| cfi_undefined (x30) |
| mov x29, 0 |
| |
| /* Pick the function arg and execute. */ |
| mov x0, x12 |
| blr x10 |
| |
| /* We are done, pass the return value through x0. */ |
| mov x8, #SYS_ify(exit) |
| svc 0x0 |
| cfi_endproc |
| .size thread_start, .-thread_start |
| |
| libc_hidden_def (__clone) |
| weak_alias (__clone, clone) |
