xqemu/target-i386/mpx_helper.c

/*
 *  x86 MPX helpers
 *
 *  Copyright (c) 2015 Red Hat, Inc.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
 */

#include "cpu.h"
#include "exec/helper-proto.h"
#include "exec/cpu_ldst.h"


void cpu_sync_bndcs_hflags(CPUX86State *env)
{
    uint32_t hflags = env->hflags;
    uint32_t hflags2 = env->hflags2;
    uint32_t bndcsr;

    if ((hflags & HF_CPL_MASK) == 3) {
        bndcsr = env->bndcs_regs.cfgu;
    } else {
        bndcsr = env->msr_bndcfgs;
    }

    if ((env->cr[4] & CR4_OSXSAVE_MASK)
        && (env->xcr0 & XSTATE_BNDCSR)
        && (bndcsr & BNDCFG_ENABLE)) {
        hflags |= HF_MPX_EN_MASK;
    } else {
        hflags &= ~HF_MPX_EN_MASK;
    }

    if (bndcsr & BNDCFG_BNDPRESERVE) {
        hflags2 |= HF2_MPX_PR_MASK;
    } else {
        hflags2 &= ~HF2_MPX_PR_MASK;
    }

    env->hflags = hflags;
    env->hflags2 = hflags2;
}

void helper_bndck(CPUX86State *env, uint32_t fail)
{
    if (unlikely(fail)) {
        env->bndcs_regs.sts = 1;
        raise_exception_ra(env, EXCP05_BOUND, GETPC());
    }
}