2 * Empire - A multi-player, client/server Internet based war game.
3 * Copyright (C) 1994-2009, Dave Pare, Jeff Bailey, Thomas Ruschak,
4 * Ken Stevens, Steve McClure
5 * Copyright (C) 1991-3 Stephen Crane
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 * See files README, COPYING and CREDITS in the root of the source
24 * tree for related information and legal notices. It is expected
25 * that future projects/authors will amend these files as needed.
29 * arch.c: architecture-dependant process context code
31 * Known contributors to this file:
33 * Steve McClure, 1994-2000
34 * Markus Armbruster, 2004-2008
44 * Historically, this was implemented by abusing setjmp() and
45 * longjump(), which required a fair amount of system-dependent and
46 * fragile hackery. We now use POSIX ucontext.h.
50 lwpNewContext(struct lwpProc *newp)
52 if (getcontext(&newp->context) < 0)
54 #ifdef MAKECONTEXT_SP_HIGH
56 * Known systems that are broken that way: Solaris prior to 10,
59 newp->context.uc_stack.ss_sp = newp->ustack + newp->usize - 8;
61 newp->context.uc_stack.ss_sp = newp->ustack;
63 newp->context.uc_stack.ss_size = newp->usize;
64 newp->context.uc_stack.ss_flags = 0;
65 newp->context.uc_link = NULL;
66 makecontext(&newp->context, lwpEntryPoint, 0);
71 lwpSwitchContext(struct lwpProc *oldp, struct lwpProc *nextp)
74 setcontext(&nextp->context);
77 if (swapcontext(&oldp->context, &nextp->context) < 0)