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https://github.com/freebsd/freebsd-src
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559a218c9b
These sys/cdefs.h are not needed. Purge them. They are mostly left-over from the $FreeBSD$ removal. A few in libc are still required for macros that cdefs.h defines. Keep those. Sponsored by: Netflix Differential Revision: https://reviews.freebsd.org/D42385
138 lines
3.4 KiB
C
138 lines
3.4 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2011 Konstantin Belousov <kib@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/types.h>
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#include <sys/ucontext.h>
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#include <errno.h>
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#include <stdarg.h>
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#include <stdlib.h>
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#include <machine/cpufunc.h>
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#include <machine/specialreg.h>
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#include <machine/sysarch.h>
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#include <x86/ifunc.h>
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#include <x86/fpu.h>
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#if defined __i386__
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#define X86_GET_XFPUSTATE I386_GET_XFPUSTATE
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typedef struct savexmm savex86_t ;
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typedef struct i386_get_xfpustate x86_get_xfpustate_t;
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#elif defined __amd64__
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#define X86_GET_XFPUSTATE AMD64_GET_XFPUSTATE
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typedef struct savefpu savex86_t;
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typedef struct amd64_get_xfpustate x86_get_xfpustate_t;
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#else
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#error "Wrong arch"
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#endif
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static int xstate_sz = 0;
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static int
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__getcontextx_size_xfpu(void)
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{
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return (sizeof(ucontext_t) + xstate_sz);
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}
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DEFINE_UIFUNC(, int, __getcontextx_size, (void))
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{
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u_int p[4];
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if ((cpu_feature2 & CPUID2_OSXSAVE) != 0) {
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cpuid_count(0xd, 0x0, p);
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xstate_sz = p[1] - sizeof(savex86_t);
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}
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return (__getcontextx_size_xfpu);
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}
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static int
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__fillcontextx2_xfpu(char *ctx)
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{
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x86_get_xfpustate_t xfpu;
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ucontext_t *ucp;
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ucp = (ucontext_t *)ctx;
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xfpu.addr = (char *)(ucp + 1);
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xfpu.len = xstate_sz;
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if (sysarch(X86_GET_XFPUSTATE, &xfpu) == -1)
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return (-1);
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ucp->uc_mcontext.mc_xfpustate = (__register_t)xfpu.addr;
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ucp->uc_mcontext.mc_xfpustate_len = xstate_sz;
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ucp->uc_mcontext.mc_flags |= _MC_HASFPXSTATE;
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return (0);
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}
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static int
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__fillcontextx2_noxfpu(char *ctx)
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{
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ucontext_t *ucp;
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ucp = (ucontext_t *)ctx;
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ucp->uc_mcontext.mc_xfpustate = 0;
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ucp->uc_mcontext.mc_xfpustate_len = 0;
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return (0);
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}
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DEFINE_UIFUNC(, int, __fillcontextx2, (char *))
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{
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return ((cpu_feature2 & CPUID2_OSXSAVE) != 0 ? __fillcontextx2_xfpu :
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__fillcontextx2_noxfpu);
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}
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int
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__fillcontextx(char *ctx)
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{
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ucontext_t *ucp;
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ucp = (ucontext_t *)ctx;
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if (getcontext(ucp) == -1)
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return (-1);
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__fillcontextx2(ctx);
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return (0);
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}
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__weak_reference(__getcontextx, getcontextx);
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ucontext_t *
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__getcontextx(void)
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{
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char *ctx;
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int error;
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ctx = malloc(__getcontextx_size());
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if (ctx == NULL)
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return (NULL);
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if (__fillcontextx(ctx) == -1) {
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error = errno;
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free(ctx);
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errno = error;
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return (NULL);
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}
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return ((ucontext_t *)ctx);
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}
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