diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/s390/clone.S')
| -rw-r--r-- | sysdeps/unix/sysv/linux/s390/clone.S | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/s390/clone.S b/sysdeps/unix/sysv/linux/s390/clone.S new file mode 100644 index 0000000000..bde800d3b2 --- /dev/null +++ b/sysdeps/unix/sysv/linux/s390/clone.S @@ -0,0 +1,66 @@ +/* Copyright (C) 2000 Free Software Foundation, Inc. + 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 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> + +/*int __clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg);*/ +/* sys_clone(void *child_stack, unsigned long flags) */ + + .text +ENTRY(__clone) + /* Sanity check arguments & move registers */ + ltr %r1,%r2 /* no NULL function pointers */ + lhi %r2,-EINVAL + jz SYSCALL_ERROR_LABEL + ltr %r3,%r3 /* no NULL stack pointers */ + jz SYSCALL_ERROR_LABEL + /* move child_stack and flags, then call SVC */ + lr %r2,%r3 + lr %r3,%r4 + svc SYS_ify(clone) + ltr %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 */ + lr %r2,%r5 /* set first parameter to void *arg */ + sr %r11,%r11 /* terminate the stack frame */ + ahi %r15,-96 /* make room on the stack for the save area */ + basr %r14,%r1 /* jump to fn */ +#ifdef PIC + basr %r12,0 +.L0: lr %r1,%r12 + al %r12,.L1-.L0(%r12) + al %r1,.L2-.L0(%r1) + br %r1 /* branch to _exit -> thread termination */ +.L1: .long _GLOBAL_OFFSET_TABLE_ - .L0 +.L2: .long _exit@PLT - .L0 +#else + basr %r1,0 +.L0: al %r1,.L1-.L0(0,%r1) + br %r1 /* branch to _exit -> thread termination */ +.L1: .long _exit - .L0 +#endif +PSEUDO_END (__clone) |