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/npx.h>
36 #include <machine/specialreg.h>
37 #include <machine/sysarch.h>
39 static int xstate_sz = -1;
42 __getcontextx_size(void)
47 if (xstate_sz == -1) {
52 " xorl $0x200000,%%eax\n"
63 : "=r" (cpuid_supported) : : "eax", "ecx");
64 if (cpuid_supported) {
70 : "=a" (p[0]), "=r" (p[1]), "=c" (p[2]), "=d" (p[3])
72 if ((p[2] & CPUID2_OSXSAVE) != 0) {
78 : "=a" (p[0]), "=r" (p[1]), "=c" (p[2]),
80 : "0" (0xd), "2" (0x0));
81 xstate_sz = p[1] - sizeof(struct savexmm);
88 return (sizeof(ucontext_t) + xstate_sz);
92 __fillcontextx2(char *ctx)
94 struct i386_get_xfpustate xfpu;
97 ucp = (ucontext_t *)ctx;
99 xfpu.addr = (char *)(ucp + 1);
100 xfpu.len = xstate_sz;
101 if (sysarch(I386_GET_XFPUSTATE, &xfpu) == -1)
103 ucp->uc_mcontext.mc_xfpustate = (__register_t)xfpu.addr;
104 ucp->uc_mcontext.mc_xfpustate_len = xstate_sz;
105 ucp->uc_mcontext.mc_flags |= _MC_HASFPXSTATE;
107 ucp->uc_mcontext.mc_xfpustate = 0;
108 ucp->uc_mcontext.mc_xfpustate_len = 0;
114 __fillcontextx(char *ctx)
118 ucp = (ucontext_t *)ctx;
119 if (getcontext(ucp) == -1)
121 __fillcontextx2(ctx);
125 __weak_reference(__getcontextx, getcontextx);
133 ctx = malloc(__getcontextx_size());
136 if (__fillcontextx(ctx) == -1) {
142 return ((ucontext_t *)ctx);