freebsd-nq/lib/libc/x86/gen/getcontextx.c
Konstantin Belousov 7c5a46a1bc Remove resolver_qual from DEFINE_IFUNC/DEFINE_UIFUNC macros.
In all practical situations, the resolver visibility is static.

Requested by:	markj
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
Approved by:	so (emaste)
Differential revision:	https://reviews.freebsd.org/D20281
2019-05-16 22:20:54 +00:00

141 lines
3.5 KiB
C

/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2011 Konstantin Belousov <kib@FreeBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/types.h>
#include <sys/ucontext.h>
#include <errno.h>
#include <stdarg.h>
#include <stdlib.h>
#include <machine/cpufunc.h>
#include <machine/specialreg.h>
#include <machine/sysarch.h>
#include <x86/ifunc.h>
#include <x86/fpu.h>
#if defined __i386__
#define X86_GET_XFPUSTATE I386_GET_XFPUSTATE
typedef struct savexmm savex86_t ;
typedef struct i386_get_xfpustate x86_get_xfpustate_t;
#elif defined __amd64__
#define X86_GET_XFPUSTATE AMD64_GET_XFPUSTATE
typedef struct savefpu savex86_t;
typedef struct amd64_get_xfpustate x86_get_xfpustate_t;
#else
#error "Wrong arch"
#endif
static int xstate_sz = 0;
static int
__getcontextx_size_xfpu(void)
{
return (sizeof(ucontext_t) + xstate_sz);
}
DEFINE_UIFUNC(, int, __getcontextx_size, (void))
{
u_int p[4];
if ((cpu_feature2 & CPUID2_OSXSAVE) != 0) {
cpuid_count(0xd, 0x0, p);
xstate_sz = p[1] - sizeof(savex86_t);
}
return (__getcontextx_size_xfpu);
}
static int
__fillcontextx2_xfpu(char *ctx)
{
x86_get_xfpustate_t xfpu;
ucontext_t *ucp;
ucp = (ucontext_t *)ctx;
xfpu.addr = (char *)(ucp + 1);
xfpu.len = xstate_sz;
if (sysarch(X86_GET_XFPUSTATE, &xfpu) == -1)
return (-1);
ucp->uc_mcontext.mc_xfpustate = (__register_t)xfpu.addr;
ucp->uc_mcontext.mc_xfpustate_len = xstate_sz;
ucp->uc_mcontext.mc_flags |= _MC_HASFPXSTATE;
return (0);
}
static int
__fillcontextx2_noxfpu(char *ctx)
{
ucontext_t *ucp;
ucp = (ucontext_t *)ctx;
ucp->uc_mcontext.mc_xfpustate = 0;
ucp->uc_mcontext.mc_xfpustate_len = 0;
return (0);
}
DEFINE_UIFUNC(, int, __fillcontextx2, (char *))
{
return ((cpu_feature2 & CPUID2_OSXSAVE) != 0 ? __fillcontextx2_xfpu :
__fillcontextx2_noxfpu);
}
int
__fillcontextx(char *ctx)
{
ucontext_t *ucp;
ucp = (ucontext_t *)ctx;
if (getcontext(ucp) == -1)
return (-1);
__fillcontextx2(ctx);
return (0);
}
__weak_reference(__getcontextx, getcontextx);
ucontext_t *
__getcontextx(void)
{
char *ctx;
int error;
ctx = malloc(__getcontextx_size());
if (ctx == NULL)
return (NULL);
if (__fillcontextx(ctx) == -1) {
error = errno;
free(ctx);
errno = error;
return (NULL);
}
return ((ucontext_t *)ctx);
}