diff options
Diffstat (limited to 'libc/sysdeps/linux/sparc/fork.S')
| -rw-r--r-- | libc/sysdeps/linux/sparc/fork.S | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/sparc/fork.S b/libc/sysdeps/linux/sparc/fork.S new file mode 100644 index 000000000..6bab58c81 --- /dev/null +++ b/libc/sysdeps/linux/sparc/fork.S @@ -0,0 +1,46 @@ +/* Copyright (C) 1991, 92, 94, 95, 97, 99 Free Software Foundation, Inc. + 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 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. */ + +#include <sysdep.h> + +.text; +.global fork; +.align 4; +fork: ; +.type fork ,@function; ; + + mov 2, %g1 ; + ta 0x10; + bcc,a 9000f; + nop; + save %sp,-96,%sp; + call __errno_location; + nop; + st %i0,[%o0]; + jmpl %i7+8,%g0; + restore %g0,-1,%o0; ; + 9000:; + + /* %o1 is now 0 for the parent and 1 for the child. Decrement it to + make it -1 (all bits set) for the parent, and 0 (no bits set) + for the child. Then AND it with %o0, so the parent gets + %o0&-1==pid, and the child gets %o0&0==0. */ + sub %o1, 1, %o1 + retl + and %o0, %o1, %o0 + |