| # |
| # clone.S, part of the i960 support for the uClibc library. |
| # |
| # Copyright (C) 2002 by Okiok Data Ltd. http://www.okiok.com/ |
| # |
| # This program 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. |
| # |
| # This program 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 this program; if not, write to the Free Software Foundation, Inc., |
| # at 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| # |
| # Derived from an old port of uC-libc to the i960 by Keith Adams (kma@cse.ogi.edu). |
| # |
| |
| #include <sys/syscall.h> |
| #include <bits/errno.h> |
| |
| /* clone is even more special than fork as it mucks with stacks |
| and invokes a function in the right context after its all over. */ |
| |
| /* int _clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg); */ |
| |
| .globl clone |
| clone: |
| /* set up new stack image in regs r4-r7; argument will be in r3 in child. */ |
| ldconst 0, r4 /* pfp == 0 */ |
| addo 16, g1, r5 /* sp == newfp + 16 */ |
| mov g0, r6 /* rip == fnc */ |
| mov g2, r7 |
| stq r4, (g1) |
| |
| addo sp, 4, sp |
| st g10, -4(sp) |
| mov sp, g10 |
| ldconst __NR_clone, g13 |
| calls 0 |
| |
| /* Do the system call */ |
| cmpibg 0, g0, __syscall_error /* if < 0, error */ |
| be thread_start /* if == 0, we're the child */ |
| ret /* we're the parent */ |
| |
| __syscall_error: |
| not g0, r3 |
| callx ___errno_location |
| st r3, (g0) |
| ret |
| |
| thread_start: |
| # our new pfp is in g1; here we go |
| flushreg |
| mov g1, pfp |
| flushreg |
| ret |