| /* Copyright (C) 2000, 2001, 2004 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com). |
| |
| 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, write to the Free |
| Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307 USA. */ |
| |
| /* 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) |
| st %r6,24(%r15) /* store %r6 to save area */ |
| cfi_offset (%r6, -72) |
| lr %r0,%r5 /* move *arg out of the way */ |
| ltr %r1,%r2 /* check fn and move to %r1 */ |
| jz error /* no NULL function pointers */ |
| ltr %r2,%r3 /* check child_stack and move to %r2 */ |
| jz error /* no NULL stack pointers */ |
| lr %r3,%r4 /* move flags to %r3 */ |
| lr %r4,%r6 /* move parent_tid to %r4 */ |
| l %r5,100(%r15) /* load child_tid from stack */ |
| l %r6,96(%r15) /* load tls from stack */ |
| svc SYS_ify(clone) |
| ltr %r2,%r2 /* check return code */ |
| jz thread_start |
| l %r6,24(%r15) /* restore %r6 */ |
| jm SYSCALL_ERROR_LABEL |
| br %r14 |
| error: |
| lhi %r2,-EINVAL |
| j 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 |
| st %r2,PID(%r3) |
| st %r2,TID(%r3) |
| 1: |
| #endif |
| /* fn is in gpr 1, arg in gpr 0 */ |
| lr %r2,%r0 /* set first parameter to void *arg */ |
| ahi %r15,-96 /* make room on the stack for the save area */ |
| xc 0(4,%r15),0(%r15) |
| basr %r14,%r1 /* jump to fn */ |
| DO_CALL (exit, 1) |
| weak_alias (__clone, clone) |
