target/i386/mpx_helper.c

   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 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
  26
  27 void helper_bndck(CPUX86State *env, uint32_t fail)
  28 {
  29     if (unlikely(fail)) {
  30         env->bndcs_regs.sts = 1;
  31         raise_exception_ra(env, EXCP05_BOUND, GETPC());
  32     }
  33 }
  34
  35 static uint64_t lookup_bte64(CPUX86State *env, uint64_t base, uintptr_t ra)
  36 {
  37     uint64_t bndcsr, bde, bt;
  38
  39     if ((env->hflags & HF_CPL_MASK) == 3) {
  40         bndcsr = env->bndcs_regs.cfgu;
  41     } else {
  42         bndcsr = env->msr_bndcfgs;
  43     }
  44
  45     bde = (extract64(base, 20, 28) << 3) + (extract64(bndcsr, 20, 44) << 12);
  46     bt = cpu_ldq_data_ra(env, bde, ra);
  47     if ((bt & 1) == 0) {
  48         env->bndcs_regs.sts = bde | 2;
  49         raise_exception_ra(env, EXCP05_BOUND, ra);
  50     }
  51
  52     return (extract64(base, 3, 17) << 5) + (bt & ~7);
  53 }
  54
  55 static uint32_t lookup_bte32(CPUX86State *env, uint32_t base, uintptr_t ra)
  56 {
  57     uint32_t bndcsr, bde, bt;
  58
  59     if ((env->hflags & HF_CPL_MASK) == 3) {
  60         bndcsr = env->bndcs_regs.cfgu;
  61     } else {
  62         bndcsr = env->msr_bndcfgs;
  63     }
  64
  65     bde = (extract32(base, 12, 20) << 2) + (bndcsr & TARGET_PAGE_MASK);
  66     bt = cpu_ldl_data_ra(env, bde, ra);
  67     if ((bt & 1) == 0) {
  68         env->bndcs_regs.sts = bde | 2;
  69         raise_exception_ra(env, EXCP05_BOUND, ra);
  70     }
  71
  72     return (extract32(base, 2, 10) << 4) + (bt & ~3);
  73 }
  74
  75 uint64_t helper_bndldx64(CPUX86State *env, target_ulong base, target_ulong ptr)
  76 {
  77     uintptr_t ra = GETPC();
  78     uint64_t bte, lb, ub, pt;
  79
  80     bte = lookup_bte64(env, base, ra);
  81     lb = cpu_ldq_data_ra(env, bte, ra);
  82     ub = cpu_ldq_data_ra(env, bte + 8, ra);
  83     pt = cpu_ldq_data_ra(env, bte + 16, ra);
  84
  85     if (pt != ptr) {
  86         lb = ub = 0;
  87     }
  88     env->mmx_t0.MMX_Q(0) = ub;
  89     return lb;
  90 }
  91
  92 uint64_t helper_bndldx32(CPUX86State *env, target_ulong base, target_ulong ptr)
  93 {
  94     uintptr_t ra = GETPC();
  95     uint32_t bte, lb, ub, pt;
  96
  97     bte = lookup_bte32(env, base, ra);
  98     lb = cpu_ldl_data_ra(env, bte, ra);
  99     ub = cpu_ldl_data_ra(env, bte + 4, ra);
 100     pt = cpu_ldl_data_ra(env, bte + 8, ra);
 101
 102     if (pt != ptr) {
 103         lb = ub = 0;
 104     }
 105     return ((uint64_t)ub << 32) | lb;
 106 }
 107
 108 void helper_bndstx64(CPUX86State *env, target_ulong base, target_ulong ptr,
 109                      uint64_t lb, uint64_t ub)
 110 {
 111     uintptr_t ra = GETPC();
 112     uint64_t bte;
 113
 114     bte = lookup_bte64(env, base, ra);
 115     cpu_stq_data_ra(env, bte, lb, ra);
 116     cpu_stq_data_ra(env, bte + 8, ub, ra);
 117     cpu_stq_data_ra(env, bte + 16, ptr, ra);
 118 }
 119
 120 void helper_bndstx32(CPUX86State *env, target_ulong base, target_ulong ptr,
 121                      uint64_t lb, uint64_t ub)
 122 {
 123     uintptr_t ra = GETPC();
 124     uint32_t bte;
 125
 126     bte = lookup_bte32(env, base, ra);
 127     cpu_stl_data_ra(env, bte, lb, ra);
 128     cpu_stl_data_ra(env, bte + 4, ub, ra);
 129     cpu_stl_data_ra(env, bte + 8, ptr, ra);
 130 }
 131
 132 void helper_bnd_jmp(CPUX86State *env)
 133 {
 134     if (!(env->hflags2 & HF2_MPX_PR_MASK)) {
 135         memset(env->bnd_regs, 0, sizeof(env->bnd_regs));
 136         env->hflags &= ~HF_MPX_IU_MASK;
 137     }
 138 }