projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| ffeac417 | 1 | /* Wrapper around clone system call. 64 bit S/390 version. |
| 04277e02 | 2 | Copyright (C) 2001-2019 Free Software Foundation, Inc. |
| 847b055c | 3 | Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com). |
| ffeac417 | 4 | This file is part of the GNU C Library. |
| 847b055c AJ |
5 | |
| 6 | The GNU C Library is free software; you can redistribute it and/or | |
| 41bdb6e2 AJ |
7 | modify it under the terms of the GNU Lesser General Public |
| 8 | License as published by the Free Software Foundation; either | |
| 9 | version 2.1 of the License, or (at your option) any later version. | |
| 847b055c AJ |
10 | |
| 11 | The GNU C Library is distributed in the hope that it will be useful, | |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 41bdb6e2 | 14 | Lesser General Public License for more details. |
| 847b055c | 15 | |
| 41bdb6e2 | 16 | You should have received a copy of the GNU Lesser General Public |
| 59ba27a6 | 17 | License along with the GNU C Library; if not, see |
| 5a82c748 | 18 | <https://www.gnu.org/licenses/>. */ |
| 847b055c AJ |
19 | |
| 20 | /* clone is even more special than fork as it mucks with stacks | |
| 21 | and invokes a function in the right context after its all over. */ | |
| 22 | ||
| 23 | #include <sysdep.h> | |
| f23673fc | 24 | #include <tls.h> |
| 847b055c AJ |
25 | #define _ERRNO_H 1 |
| 26 | #include <bits/errno.h> | |
| 27 | ||
| e6ebd2e4 | 28 | /* int __clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg, |
| db34912e | 29 | pid_t *parent_tid, void *tls, pid_t *child_tid); */ |
| e6ebd2e4 UD |
30 | /* sys_clone (void *child_stack, unsigned long flags, |
| 31 | pid_t *parent_tid, pid_t *child_tid, void *tls); */ | |
| 32 | ||
| 847b055c AJ |
33 | .text |
| 34 | ENTRY(__clone) | |
| db34912e | 35 | stg %r6,48(%r15) /* store %r6 to save area */ |
| 844a34a2 | 36 | cfi_offset (%r6,-112) |
| e6ebd2e4 | 37 | lgr %r0,%r5 /* move *arg out of the way */ |
| db34912e UD |
38 | ltgr %r1,%r2 /* check fn and move to %r1 */ |
| 39 | jz error /* no NULL function pointers */ | |
| 40 | ltgr %r2,%r3 /* check child_stack and move to %r2 */ | |
| 41 | jz error /* no NULL stack pointers */ | |
| 42 | lgr %r3,%r4 /* move flags to %r3 */ | |
| 43 | lgr %r4,%r6 /* move parent_tid to %r4 */ | |
| 44 | lg %r5,168(%r15) /* load child_tid from stack */ | |
| c4c1336c | 45 | lg %r6,160(%r15) /* load tls from stack */ |
| ffeac417 UD |
46 | svc SYS_ify(clone) |
| 47 | ltgr %r2,%r2 /* check return code */ | |
| ffeac417 | 48 | jz thread_start |
| 567678b6 UD |
49 | lg %r6,48(%r15) /* restore %r6 */ |
| 50 | jgm SYSCALL_ERROR_LABEL | |
| ffeac417 | 51 | br %r14 |
| db34912e UD |
52 | error: |
| 53 | lghi %r2,-EINVAL | |
| 54 | jg SYSCALL_ERROR_LABEL | |
| 844a34a2 | 55 | PSEUDO_END (__clone) |
| 847b055c AJ |
56 | |
| 57 | thread_start: | |
| 8beba15d SL |
58 | cfi_startproc |
| 59 | /* Mark r14 as undefined in order to stop unwinding here! */ | |
| 60 | cfi_undefined (r14) | |
| e6ebd2e4 UD |
61 | /* fn is in gpr 1, arg in gpr 0 */ |
| 62 | lgr %r2,%r0 /* set first parameter to void *arg */ | |
| f010f4a3 | 63 | aghi %r15,-160 /* make room on the stack for the save area */ |
| e6ebd2e4 | 64 | xc 0(8,%r15),0(%r15) |
| ffeac417 | 65 | basr %r14,%r1 /* jump to fn */ |
| f8ea3acb | 66 | DO_CALL (exit, 1) |
| 8beba15d | 67 | cfi_endproc |
| 9ff72da4 AZ |
68 | |
| 69 | libc_hidden_def (__clone) | |
| d555194c | 70 | weak_alias (__clone, clone) |