2 * Copyright (c) 2011 Konstantin Belousov <kib@FreeBSD.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
30 #include <sys/types.h>
31 #include <sys/ucontext.h>
35 #include <machine/cpufunc.h>
36 #include <machine/fpu.h>
37 #include <machine/specialreg.h>
38 #include <machine/sysarch.h>
40 static int xstate_sz = -1;
43 __getcontextx_size(void)
47 if (xstate_sz == -1) {
49 if ((p[2] & CPUID2_OSXSAVE) != 0) {
50 cpuid_count(0xd, 0x0, p);
51 xstate_sz = p[1] - sizeof(struct savefpu);
56 return (sizeof(ucontext_t) + xstate_sz);
60 __fillcontextx2(char *ctx)
62 struct amd64_get_xfpustate xfpu;
65 ucp = (ucontext_t *)ctx;
67 xfpu.addr = (char *)(ucp + 1);
69 if (sysarch(AMD64_GET_XFPUSTATE, &xfpu) == -1)
71 ucp->uc_mcontext.mc_xfpustate = (__register_t)xfpu.addr;
72 ucp->uc_mcontext.mc_xfpustate_len = xstate_sz;
73 ucp->uc_mcontext.mc_flags |= _MC_HASFPXSTATE;
75 ucp->uc_mcontext.mc_xfpustate = 0;
76 ucp->uc_mcontext.mc_xfpustate_len = 0;
82 __fillcontextx(char *ctx)
86 ucp = (ucontext_t *)ctx;
87 if (getcontext(ucp) == -1)
93 __weak_reference(__getcontextx, getcontextx);
101 ctx = malloc(__getcontextx_size());
104 if (__fillcontextx(ctx) == -1) {
110 return ((ucontext_t *)ctx);