# # 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, see <http://www.gnu.org/licenses/>. # # 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