2 * Empire - A multi-player, client/server Internet based war game.
3 * Copyright (C) 1994-2014, Dave Pare, Jeff Bailey, Thomas Ruschak,
4 * Ken Stevens, Steve McClure, Markus Armbruster
5 * Copyright (C) 1991-3 Stephen Crane
7 * Empire 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 3 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, see <http://www.gnu.org/licenses/>.
22 * See files README, COPYING and CREDITS in the root of the source
23 * tree for related information and legal notices. It is expected
24 * that future projects/authors will amend these files as needed.
28 * arch.c: architecture-dependant process context code
30 * Known contributors to this file:
32 * Steve McClure, 1994-2000
33 * Markus Armbruster, 2004-2008
42 * Historically, this was implemented by abusing setjmp() and
43 * longjump(), which required a fair amount of system-dependent and
44 * fragile hackery. We now use POSIX ucontext.h.
48 lwpNewContext(struct lwpProc *newp)
50 if (getcontext(&newp->context) < 0)
52 #ifdef MAKECONTEXT_SP_HIGH
54 * Known systems that are broken that way: Solaris prior to 10,
57 newp->context.uc_stack.ss_sp = newp->ustack + newp->usize - 8;
59 newp->context.uc_stack.ss_sp = newp->ustack;
61 newp->context.uc_stack.ss_size = newp->usize;
62 newp->context.uc_stack.ss_flags = 0;
63 newp->context.uc_link = NULL;
64 makecontext(&newp->context, lwpEntryPoint, 0);
69 lwpSwitchContext(struct lwpProc *oldp, struct lwpProc *nextp)
72 setcontext(&nextp->context);
75 if (swapcontext(&oldp->context, &nextp->context) < 0)