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
helper_bndck(CPUX86State * env,uint32_t fail)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
lookup_bte64(CPUX86State * env,uint64_t base,uintptr_t ra)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
lookup_bte32(CPUX86State * env,uint32_t base,uintptr_t ra)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
helper_bndldx64(CPUX86State * env,target_ulong base,target_ulong ptr)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
helper_bndldx32(CPUX86State * env,target_ulong base,target_ulong ptr)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
helper_bndstx64(CPUX86State * env,target_ulong base,target_ulong ptr,uint64_t lb,uint64_t ub)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
helper_bndstx32(CPUX86State * env,target_ulong base,target_ulong ptr,uint64_t lb,uint64_t ub)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
helper_bnd_jmp(CPUX86State * env)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 }
139