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f4f1110e RH |
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 | ||
30456d5b | 20 | #include "qemu/osdep.h" |
f4f1110e RH |
21 | #include "cpu.h" |
22 | #include "exec/helper-proto.h" | |
23 | #include "exec/cpu_ldst.h" | |
63c91552 | 24 | #include "exec/exec-all.h" |
f4f1110e RH |
25 | |
26 | ||
27 | void cpu_sync_bndcs_hflags(CPUX86State *env) | |
28 | { | |
29 | uint32_t hflags = env->hflags; | |
30 | uint32_t hflags2 = env->hflags2; | |
31 | uint32_t bndcsr; | |
32 | ||
33 | if ((hflags & HF_CPL_MASK) == 3) { | |
34 | bndcsr = env->bndcs_regs.cfgu; | |
35 | } else { | |
36 | bndcsr = env->msr_bndcfgs; | |
37 | } | |
38 | ||
39 | if ((env->cr[4] & CR4_OSXSAVE_MASK) | |
cfc3b074 | 40 | && (env->xcr0 & XSTATE_BNDCSR_MASK) |
f4f1110e RH |
41 | && (bndcsr & BNDCFG_ENABLE)) { |
42 | hflags |= HF_MPX_EN_MASK; | |
43 | } else { | |
44 | hflags &= ~HF_MPX_EN_MASK; | |
45 | } | |
46 | ||
47 | if (bndcsr & BNDCFG_BNDPRESERVE) { | |
48 | hflags2 |= HF2_MPX_PR_MASK; | |
49 | } else { | |
50 | hflags2 &= ~HF2_MPX_PR_MASK; | |
51 | } | |
52 | ||
53 | env->hflags = hflags; | |
54 | env->hflags2 = hflags2; | |
55 | } | |
523e28d7 RH |
56 | |
57 | void helper_bndck(CPUX86State *env, uint32_t fail) | |
58 | { | |
59 | if (unlikely(fail)) { | |
60 | env->bndcs_regs.sts = 1; | |
61 | raise_exception_ra(env, EXCP05_BOUND, GETPC()); | |
62 | } | |
63 | } | |
bdd87b3b RH |
64 | |
65 | static uint64_t lookup_bte64(CPUX86State *env, uint64_t base, uintptr_t ra) | |
66 | { | |
67 | uint64_t bndcsr, bde, bt; | |
68 | ||
69 | if ((env->hflags & HF_CPL_MASK) == 3) { | |
70 | bndcsr = env->bndcs_regs.cfgu; | |
71 | } else { | |
72 | bndcsr = env->msr_bndcfgs; | |
73 | } | |
74 | ||
75 | bde = (extract64(base, 20, 28) << 3) + (extract64(bndcsr, 20, 44) << 12); | |
76 | bt = cpu_ldq_data_ra(env, bde, ra); | |
77 | if ((bt & 1) == 0) { | |
78 | env->bndcs_regs.sts = bde | 2; | |
79 | raise_exception_ra(env, EXCP05_BOUND, ra); | |
80 | } | |
81 | ||
82 | return (extract64(base, 3, 17) << 5) + (bt & ~7); | |
83 | } | |
84 | ||
85 | static uint32_t lookup_bte32(CPUX86State *env, uint32_t base, uintptr_t ra) | |
86 | { | |
87 | uint32_t bndcsr, bde, bt; | |
88 | ||
89 | if ((env->hflags & HF_CPL_MASK) == 3) { | |
90 | bndcsr = env->bndcs_regs.cfgu; | |
91 | } else { | |
92 | bndcsr = env->msr_bndcfgs; | |
93 | } | |
94 | ||
95 | bde = (extract32(base, 12, 20) << 2) + (bndcsr & TARGET_PAGE_MASK); | |
96 | bt = cpu_ldl_data_ra(env, bde, ra); | |
97 | if ((bt & 1) == 0) { | |
98 | env->bndcs_regs.sts = bde | 2; | |
99 | raise_exception_ra(env, EXCP05_BOUND, ra); | |
100 | } | |
101 | ||
102 | return (extract32(base, 2, 10) << 4) + (bt & ~3); | |
103 | } | |
104 | ||
105 | uint64_t helper_bndldx64(CPUX86State *env, target_ulong base, target_ulong ptr) | |
106 | { | |
107 | uintptr_t ra = GETPC(); | |
108 | uint64_t bte, lb, ub, pt; | |
109 | ||
110 | bte = lookup_bte64(env, base, ra); | |
111 | lb = cpu_ldq_data_ra(env, bte, ra); | |
112 | ub = cpu_ldq_data_ra(env, bte + 8, ra); | |
113 | pt = cpu_ldq_data_ra(env, bte + 16, ra); | |
114 | ||
115 | if (pt != ptr) { | |
116 | lb = ub = 0; | |
117 | } | |
118 | env->mmx_t0.MMX_Q(0) = ub; | |
119 | return lb; | |
120 | } | |
121 | ||
122 | uint64_t helper_bndldx32(CPUX86State *env, target_ulong base, target_ulong ptr) | |
123 | { | |
124 | uintptr_t ra = GETPC(); | |
125 | uint32_t bte, lb, ub, pt; | |
126 | ||
127 | bte = lookup_bte32(env, base, ra); | |
128 | lb = cpu_ldl_data_ra(env, bte, ra); | |
129 | ub = cpu_ldl_data_ra(env, bte + 4, ra); | |
130 | pt = cpu_ldl_data_ra(env, bte + 8, ra); | |
131 | ||
132 | if (pt != ptr) { | |
133 | lb = ub = 0; | |
134 | } | |
135 | return ((uint64_t)ub << 32) | lb; | |
136 | } | |
137 | ||
138 | void helper_bndstx64(CPUX86State *env, target_ulong base, target_ulong ptr, | |
139 | uint64_t lb, uint64_t ub) | |
140 | { | |
141 | uintptr_t ra = GETPC(); | |
142 | uint64_t bte; | |
143 | ||
144 | bte = lookup_bte64(env, base, ra); | |
145 | cpu_stq_data_ra(env, bte, lb, ra); | |
146 | cpu_stq_data_ra(env, bte + 8, ub, ra); | |
147 | cpu_stq_data_ra(env, bte + 16, ptr, ra); | |
148 | } | |
149 | ||
150 | void helper_bndstx32(CPUX86State *env, target_ulong base, target_ulong ptr, | |
151 | uint64_t lb, uint64_t ub) | |
152 | { | |
153 | uintptr_t ra = GETPC(); | |
154 | uint32_t bte; | |
155 | ||
156 | bte = lookup_bte32(env, base, ra); | |
157 | cpu_stl_data_ra(env, bte, lb, ra); | |
158 | cpu_stl_data_ra(env, bte + 4, ub, ra); | |
159 | cpu_stl_data_ra(env, bte + 8, ptr, ra); | |
160 | } | |
7d117ce8 RH |
161 | |
162 | void helper_bnd_jmp(CPUX86State *env) | |
163 | { | |
164 | if (!(env->hflags2 & HF2_MPX_PR_MASK)) { | |
165 | memset(env->bnd_regs, 0, sizeof(env->bnd_regs)); | |
166 | env->hflags &= ~HF_MPX_IU_MASK; | |
167 | } | |
168 | } |