LXR qemu/target/i386/tcg/mpx

   1/*
   2 *  x86 MPX helpers
   3 *
   4 *  Copyright (c) 2015 Red Hat, Inc.
   5 *
   6 * This library is free software; you can redistribute it and/or
   7 * modify it under the terms of the GNU Lesser General Public
   8 * License as published by the Free Software Foundation; either
   9 * version 2.1 of the License, or (at your option) any later version.
  10 *
  11 * This library is distributed in the hope that it will be useful,
  12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14 * Lesser General Public License for more details.
  15 *
  16 * You should have received a copy of the GNU Lesser General Public
  17 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20#include "qemu/osdep.h"
  21#include "cpu.h"
  22#include "exec/helper-proto.h"
  23#include "exec/cpu_ldst.h"
  24#include "exec/exec-all.h"
  25#include "helper-tcg.h"
  26
  27
  28void helper_bndck(CPUX86State *env, uint32_t fail)
  29{
  30    if (unlikely(fail)) {
  31        env->bndcs_regs.sts = 1;
  32        raise_exception_ra(env, EXCP05_BOUND, GETPC());
  33    }
  34}
  35
  36static uint64_t lookup_bte64(CPUX86State *env, uint64_t base, uintptr_t ra)
  37{
  38    uint64_t bndcsr, bde, bt;
  39
  40    if ((env->hflags & HF_CPL_MASK) == 3) {
  41        bndcsr = env->bndcs_regs.cfgu;
  42    } else {
  43        bndcsr = env->msr_bndcfgs;
  44    }
  45
  46    bde = (extract64(base, 20, 28) << 3) + (extract64(bndcsr, 20, 44) << 12);
  47    bt = cpu_ldq_data_ra(env, bde, ra);
  48    if ((bt & 1) == 0) {
  49        env->bndcs_regs.sts = bde | 2;
  50        raise_exception_ra(env, EXCP05_BOUND, ra);
  51    }
  52
  53    return (extract64(base, 3, 17) << 5) + (bt & ~7);
  54}
  55
  56static uint32_t lookup_bte32(CPUX86State *env, uint32_t base, uintptr_t ra)
  57{
  58    uint32_t bndcsr, bde, bt;
  59
  60    if ((env->hflags & HF_CPL_MASK) == 3) {
  61        bndcsr = env->bndcs_regs.cfgu;
  62    } else {
  63        bndcsr = env->msr_bndcfgs;
  64    }
  65
  66    bde = (extract32(base, 12, 20) << 2) + (bndcsr & TARGET_PAGE_MASK);
  67    bt = cpu_ldl_data_ra(env, bde, ra);
  68    if ((bt & 1) == 0) {
  69        env->bndcs_regs.sts = bde | 2;
  70        raise_exception_ra(env, EXCP05_BOUND, ra);
  71    }
  72
  73    return (extract32(base, 2, 10) << 4) + (bt & ~3);
  74}
  75
  76uint64_t helper_bndldx64(CPUX86State *env, target_ulong base, target_ulong ptr)
  77{
  78    uintptr_t ra = GETPC();
  79    uint64_t bte, lb, ub, pt;
  80
  81    bte = lookup_bte64(env, base, ra);
  82    lb = cpu_ldq_data_ra(env, bte, ra);
  83    ub = cpu_ldq_data_ra(env, bte + 8, ra);
  84    pt = cpu_ldq_data_ra(env, bte + 16, ra);
  85
  86    if (pt != ptr) {
  87        lb = ub = 0;
  88    }
  89    env->mmx_t0.MMX_Q(0) = ub;
  90    return lb;
  91}
  92
  93uint64_t helper_bndldx32(CPUX86State *env, target_ulong base, target_ulong ptr)
  94{
  95    uintptr_t ra = GETPC();
  96    uint32_t bte, lb, ub, pt;
  97
  98    bte = lookup_bte32(env, base, ra);
  99    lb = cpu_ldl_data_ra(env, bte, ra);
 100    ub = cpu_ldl_data_ra(env, bte + 4, ra);
 101    pt = cpu_ldl_data_ra(env, bte + 8, ra);
 102
 103    if (pt != ptr) {
 104        lb = ub = 0;
 105    }
 106    return ((uint64_t)ub << 32) | lb;
 107}
 108
 109void helper_bndstx64(CPUX86State *env, target_ulong base, target_ulong ptr,
 110                     uint64_t lb, uint64_t ub)
 111{
 112    uintptr_t ra = GETPC();
 113    uint64_t bte;
 114
 115    bte = lookup_bte64(env, base, ra);
 116    cpu_stq_data_ra(env, bte, lb, ra);
 117    cpu_stq_data_ra(env, bte + 8, ub, ra);
 118    cpu_stq_data_ra(env, bte + 16, ptr, ra);
 119}
 120
 121void helper_bndstx32(CPUX86State *env, target_ulong base, target_ulong ptr,
 122                     uint64_t lb, uint64_t ub)
 123{
 124    uintptr_t ra = GETPC();
 125    uint32_t bte;
 126
 127    bte = lookup_bte32(env, base, ra);
 128    cpu_stl_data_ra(env, bte, lb, ra);
 129    cpu_stl_data_ra(env, bte + 4, ub, ra);
 130    cpu_stl_data_ra(env, bte + 8, ptr, ra);
 131}
 132
 133void helper_bnd_jmp(CPUX86State *env)
 134{
 135    if (!(env->hflags2 & HF2_MPX_PR_MASK)) {
 136        memset(env->bnd_regs, 0, sizeof(env->bnd_regs));
 137        env->hflags &= ~HF_MPX_IU_MASK;
 138    }
 139}
 140