2 * Copyright (c) 2003 Jake Burkholder.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
30 #include <sys/param.h>
31 #include <sys/signal.h>
32 #include <sys/ucontext.h>
34 #include <machine/frame.h>
35 #include <machine/tstate.h>
42 __weak_reference(__makecontext, makecontext);
44 void _ctx_done(ucontext_t *ucp);
45 void _ctx_start(void);
48 __makecontext(ucontext_t *ucp, void (*start)(void), int argc, ...)
55 mc = &ucp->uc_mcontext;
57 (mc->mc_flags & ((1L << _MC_VERSION_BITS) - 1)) != _MC_VERSION)
59 if ((argc < 0) || (argc > 6) ||
60 (ucp->uc_stack.ss_sp == NULL) ||
61 (ucp->uc_stack.ss_size < MINSIGSTKSZ)) {
65 mc = &ucp->uc_mcontext;
66 sp = (uint64_t)ucp->uc_stack.ss_sp + ucp->uc_stack.ss_size;
68 for (i = 0; i < argc; i++)
69 mc->mc_out[i] = va_arg(ap, uint64_t);
71 mc->mc_global[1] = (uint64_t)start;
72 mc->mc_global[2] = (uint64_t)ucp;
73 mc->mc_out[6] = sp - SPOFF - sizeof(struct frame);
74 mc->mc_tnpc = (uint64_t)_ctx_start + 4;
75 mc->mc_tpc = (uint64_t)_ctx_start;
79 _ctx_done(ucontext_t *ucp)
82 if (ucp->uc_link == NULL)
85 ucp->uc_mcontext.mc_flags = 0;
86 setcontext((const ucontext_t *)ucp->uc_link);