diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/s390/s390-64/clone.S')
| -rw-r--r-- | sysdeps/unix/sysv/linux/s390/s390-64/clone.S | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/s390/s390-64/clone.S b/sysdeps/unix/sysv/linux/s390/s390-64/clone.S new file mode 100644 index 0000000000..c6b160ac39 --- /dev/null +++ b/sysdeps/unix/sysv/linux/s390/s390-64/clone.S @@ -0,0 +1,55 @@ +/* Wrapper around clone system call. 64 bit S/390 version. + Copyright (C) 2001 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 Library General Public License as + published by the Free Software Foundation; either version 2 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 + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. 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> +#define _ERRNO_H 1 +#include <bits/errno.h> + + .text +ENTRY(__clone) + /* Sanity check arguments & move registers */ + ltgr %r1,%r2 /* no NULL function pointers */ + lghi %r2,-EINVAL + jz SYSCALL_ERROR_LABEL + ltgr %r3,%r3 /* no NULL stack pointers */ + jz SYSCALL_ERROR_LABEL + /* move child_stack and flags, then call SVC */ + lgr %r2,%r3 + lgr %r3,%r4 + svc SYS_ify(clone) + ltgr %r2,%r2 /* check return code */ + jm SYSCALL_ERROR_LABEL + jz thread_start + br %r14 + +thread_start: + /* fn is in gpr 1, arg in gpr 5 */ + lgr %r2,%r5 /* set first parameter to void *arg */ + sgr %r11,%r11 /* terminate the stack frame */ + aghi %r15,-96 /* make room on the stack for the save area */ + basr %r14,%r1 /* jump to fn */ +#ifdef PIC + larl %r12,_GLOBAL_OFFSET_TABLE_ +#endif + jg _exit@PLT /* branch to _exit -> thread termination */ +PSEUDO_END (__clone) |