qemu

FORK: QEMU emulator
git clone https://git.neptards.moe/neptards/qemu.git
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mpx_helper.c (3826B)

      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 }