diff options
Diffstat (limited to 'REORG.TODO/sysdeps/unix/sysv/linux/s390/s390-32/clone.S')
| -rw-r--r-- | REORG.TODO/sysdeps/unix/sysv/linux/s390/s390-32/clone.S | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/unix/sysv/linux/s390/s390-32/clone.S b/REORG.TODO/sysdeps/unix/sysv/linux/s390/s390-32/clone.S new file mode 100644 index 0000000000..a8b4dbc90f --- /dev/null +++ b/REORG.TODO/sysdeps/unix/sysv/linux/s390/s390-32/clone.S @@ -0,0 +1,65 @@ +/* Copyright (C) 2000-2017 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, 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) + 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: + /* 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) + +libc_hidden_def (__clone) +weak_alias (__clone, clone) |