2b1de0afd1
fit into existing mcontext_t. On i386 and amd64 do return the extended FPU states using getcontextx(3). For other architectures, getcontextx(3) returns the same information as getcontext(2). Tested by: pho MFC after: 1 month
134 lines
3.5 KiB
C
134 lines
3.5 KiB
C
/*
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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/cdefs.h>
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__FBSDID("$FreeBSD$");
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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/npx.h>
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#include <machine/specialreg.h>
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#include <machine/sysarch.h>
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static int xstate_sz = -1;
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size_t
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__getcontextx_size(void)
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{
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u_int p[4];
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int cpuid_supported;
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if (xstate_sz == -1) {
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__asm __volatile(
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" pushfl\n"
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" popl %%eax\n"
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" movl %%eax,%%ecx\n"
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" xorl $0x200000,%%eax\n"
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" pushl %%eax\n"
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" popfl\n"
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" pushfl\n"
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" popl %%eax\n"
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" xorl %%eax,%%ecx\n"
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" je 1f\n"
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" movl $1,%0\n"
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" jmp 2f\n"
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"1: movl $0,%0\n"
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"2:\n"
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: "=r" (cpuid_supported) : : "eax", "ecx");
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if (cpuid_supported) {
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__asm __volatile(
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" pushl %%ebx\n"
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" cpuid\n"
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" movl %%ebx,%1\n"
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" popl %%ebx\n"
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: "=a" (p[0]), "=r" (p[1]), "=c" (p[2]), "=d" (p[3])
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: "0" (0x0));
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if ((p[2] & CPUID2_OSXSAVE) != 0) {
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__asm __volatile(
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" pushl %%ebx\n"
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" cpuid\n"
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" movl %%ebx,%1\n"
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" popl %%ebx\n"
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: "=a" (p[0]), "=r" (p[1]), "=c" (p[2]),
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"=d" (p[3])
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: "0" (0xd), "2" (0x0));
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xstate_sz = p[1] - sizeof(struct savexmm);
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} else
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xstate_sz = 0;
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} else
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xstate_sz = 0;
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}
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return (sizeof(ucontext_t) + xstate_sz);
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}
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int
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__fillcontextx(char *ctx)
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{
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struct i386_get_xfpustate xfpu;
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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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if (xstate_sz != 0) {
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xfpu.addr = (char *)(ucp + 1);
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xfpu.len = xstate_sz;
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if (sysarch(I386_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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} else {
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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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}
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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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