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 } 140