| /* Copyright (C) 1999-2018 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> |
| #include <tcb-offsets.h> |
| |
| /* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg, |
| pid_t *ptid, void *tls, pid_t *ctid); */ |
| |
| .text |
| ENTRY(__clone) |
| /* sanity check arguments. */ |
| tst r4, r4 |
| bt/s 0f |
| tst r5, r5 |
| bf 1f |
| 0: |
| bra .Lsyscall_error |
| mov #-EINVAL,r0 |
| 1: |
| /* insert the args onto the new stack */ |
| mov.l r7, @-r5 |
| /* save the function pointer as the 0th element */ |
| mov.l r4, @-r5 |
| |
| /* do the system call */ |
| mov r6, r4 |
| mov.l @r15, r6 |
| mov.l @(8,r15), r7 |
| mov.l @(4,r15), r0 |
| mov #+SYS_ify(clone), r3 |
| trapa #0x15 |
| mov r0, r1 |
| mov #-12, r2 |
| shad r2, r1 |
| not r1, r1 // r1=0 means r0 = -1 to -4095 |
| tst r1, r1 // i.e. error in linux |
| bf .Lclone_end |
| .Lsyscall_error: |
| SYSCALL_ERROR_HANDLER |
| .Lclone_end: |
| tst r0, r0 |
| bt 2f |
| .Lpseudo_end: |
| rts |
| nop |
| 2: |
| /* terminate the stack frame */ |
| mov #0, r14 |
| |
| /* thread starts */ |
| mov.l @r15, r1 |
| jsr @r1 |
| mov.l @(4,r15), r4 |
| |
| /* we are done, passing the return value through r0 */ |
| mov r0, r4 |
| mov #+SYS_ify(exit), r3 |
| trapa #0x15 |
| .align 2 |
| .LG: |
| .long _GLOBAL_OFFSET_TABLE_ |
| .L3: |
| .long PLTJMP(C_SYMBOL_NAME(_exit)) |
| PSEUDO_END (__clone) |
| |
| libc_hidden_def (__clone) |
| weak_alias (__clone, clone) |
