diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/m68k/clone.S')
| -rw-r--r-- | sysdeps/unix/sysv/linux/m68k/clone.S | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/m68k/clone.S b/sysdeps/unix/sysv/linux/m68k/clone.S new file mode 100644 index 0000000000..6baf723d9b --- /dev/null +++ b/sysdeps/unix/sysv/linux/m68k/clone.S @@ -0,0 +1,66 @@ +/* Copyright (C) 1996,97,98,2002 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Andreas Schwab (schwab@issan.informatik.uni-dortmund.de) + + 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> +#define _ERRNO_H 1 +#include <bits/errno.h> + +/* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg); */ + + .text +ENTRY (__clone) + + /* Sanity check arguments. */ + movel #-EINVAL, %d0 + movel 4(%sp), %a0 /* no NULL function pointers */ + tstl %a0 + jeq SYSCALL_ERROR_LABEL + movel 8(%sp), %a1 /* no NULL stack pointers */ + tstl %a1 + jeq SYSCALL_ERROR_LABEL + + /* Allocate space and copy the argument onto the new stack. */ + movel 16(%sp), -(%a1) + + /* Do the system call */ + exg %d2, %a1 /* save %d2 and get stack pointer */ + movel 12(%sp), %d1 /* get flags */ + movel #SYS_ify (clone), %d0 + trap #0 + exg %d2, %a1 /* restore %d2 */ + + tstl %d0 + jmi SYSCALL_ERROR_LABEL + jeq thread_start + + rts + +thread_start: + subl %fp, %fp /* terminate the stack frame */ + jsr (%a0) + movel %d0, %d1 + movel #SYS_ify (exit), %d0 + trap #0 + +PSEUDO_END (__clone) + +weak_alias (__clone, clone) |