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
helper_bndck(CPUX86State * env,uint32_t fail)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
lookup_bte64(CPUX86State * env,uint64_t base,uintptr_t ra)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
lookup_bte32(CPUX86State * env,uint32_t base,uintptr_t ra)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
helper_bndldx64(CPUX86State * env,target_ulong base,target_ulong ptr)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
helper_bndldx32(CPUX86State * env,target_ulong base,target_ulong ptr)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
helper_bndstx64(CPUX86State * env,target_ulong base,target_ulong ptr,uint64_t lb,uint64_t ub)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
helper_bndstx32(CPUX86State * env,target_ulong base,target_ulong ptr,uint64_t lb,uint64_t ub)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
helper_bnd_jmp(CPUX86State * env)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