target/i386/tcg/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 2.1 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
  28 void 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
  36 static 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
  56 static 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
  76 uint64_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
  93 uint64_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
 109 void 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
 121 void 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
 133 void 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 }