| /* Wrapper around clone system call. 64 bit S/390 version. |
| Copyright (C) 2001-2014 Free Software Foundation, Inc. |
| Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com). |
| 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> |
| #include <tls.h> |
| #define _ERRNO_H 1 |
| #include <bits/errno.h> |
| |
| /* int __clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg, |
| pid_t *parent_tid, void *tls, pid_t *child_tid); */ |
| /* sys_clone (void *child_stack, unsigned long flags, |
| pid_t *parent_tid, pid_t *child_tid, void *tls); */ |
| |
| .text |
| ENTRY(__clone) |
| stg %r6,48(%r15) /* store %r6 to save area */ |
| cfi_offset (%r6,-112) |
| lgr %r0,%r5 /* move *arg out of the way */ |
| ltgr %r1,%r2 /* check fn and move to %r1 */ |
| jz error /* no NULL function pointers */ |
| ltgr %r2,%r3 /* check child_stack and move to %r2 */ |
| jz error /* no NULL stack pointers */ |
| lgr %r3,%r4 /* move flags to %r3 */ |
| lgr %r4,%r6 /* move parent_tid to %r4 */ |
| lg %r5,168(%r15) /* load child_tid from stack */ |
| lg %r6,160(%r15) /* load tls from stack */ |
| svc SYS_ify(clone) |
| ltgr %r2,%r2 /* check return code */ |
| jz thread_start |
| lg %r6,48(%r15) /* restore %r6 */ |
| jgm SYSCALL_ERROR_LABEL |
| br %r14 |
| error: |
| lghi %r2,-EINVAL |
| jg SYSCALL_ERROR_LABEL |
| PSEUDO_END (__clone) |
| |
| thread_start: |
| #ifdef RESET_PID |
| tmh %r3,1 /* CLONE_THREAD == 0x00010000 */ |
| jne 1f |
| lhi %r2,-1 |
| tml %r3,256 /* CLONE_VM == 0x00000100 */ |
| jne 2f |
| svc SYS_ify(getpid) |
| 2: ear %r3,%a0 |
| sllg %r3,%r3,32 |
| ear %r3,%a1 |
| st %r2,PID(%r3) |
| st %r2,TID(%r3) |
| 1: |
| #endif |
| /* fn is in gpr 1, arg in gpr 0 */ |
| lgr %r2,%r0 /* set first parameter to void *arg */ |
| aghi %r15,-160 /* make room on the stack for the save area */ |
| xc 0(8,%r15),0(%r15) |
| basr %r14,%r1 /* jump to fn */ |
| DO_CALL (exit, 1) |
| weak_alias (__clone, clone) |
