2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2011 Konstantin Belousov <kib@FreeBSD.org>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
32 #include <sys/types.h>
33 #include <sys/ucontext.h>
37 #include <machine/cpufunc.h>
38 #include <machine/specialreg.h>
39 #include <machine/sysarch.h>
40 #include <x86/ifunc.h>
44 #define X86_GET_XFPUSTATE I386_GET_XFPUSTATE
45 typedef struct savexmm savex86_t ;
46 typedef struct i386_get_xfpustate x86_get_xfpustate_t;
47 #elif defined __amd64__
48 #define X86_GET_XFPUSTATE AMD64_GET_XFPUSTATE
49 typedef struct savefpu savex86_t;
50 typedef struct amd64_get_xfpustate x86_get_xfpustate_t;
55 static int xstate_sz = 0;
58 __getcontextx_size_xfpu(void)
61 return (sizeof(ucontext_t) + xstate_sz);
64 DEFINE_UIFUNC(, int, __getcontextx_size, (void), static)
68 if ((cpu_feature2 & CPUID2_OSXSAVE) != 0) {
69 cpuid_count(0xd, 0x0, p);
70 xstate_sz = p[1] - sizeof(savex86_t);
72 return (__getcontextx_size_xfpu);
76 __fillcontextx2_xfpu(char *ctx)
78 x86_get_xfpustate_t xfpu;
81 ucp = (ucontext_t *)ctx;
82 xfpu.addr = (char *)(ucp + 1);
84 if (sysarch(X86_GET_XFPUSTATE, &xfpu) == -1)
86 ucp->uc_mcontext.mc_xfpustate = (__register_t)xfpu.addr;
87 ucp->uc_mcontext.mc_xfpustate_len = xstate_sz;
88 ucp->uc_mcontext.mc_flags |= _MC_HASFPXSTATE;
93 __fillcontextx2_noxfpu(char *ctx)
97 ucp = (ucontext_t *)ctx;
98 ucp->uc_mcontext.mc_xfpustate = 0;
99 ucp->uc_mcontext.mc_xfpustate_len = 0;
103 DEFINE_UIFUNC(, int, __fillcontextx2, (char *), static)
106 return ((cpu_feature2 & CPUID2_OSXSAVE) != 0 ? __fillcontextx2_xfpu :
107 __fillcontextx2_noxfpu);
111 __fillcontextx(char *ctx)
115 ucp = (ucontext_t *)ctx;
116 if (getcontext(ucp) == -1)
118 __fillcontextx2(ctx);
122 __weak_reference(__getcontextx, getcontextx);
130 ctx = malloc(__getcontextx_size());
133 if (__fillcontextx(ctx) == -1) {
139 return ((ucontext_t *)ctx);