1 /*
2 * Copyright (C) 2012 - Virtual Open Systems and Columbia University
3 * Author: Christoffer Dall <c.dall@virtualopensystems.com>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License, version 2, as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
17 */
18
19 #include <linux/mm.h>
20 #include <linux/kvm_host.h>
21 #include <asm/kvm_arm.h>
22 #include <asm/kvm_emulate.h>
23 #include <asm/opcodes.h>
24 #include <trace/events/kvm.h>
25
26 #include "trace.h"
27
28 #define VCPU_NR_MODES 6
29 #define VCPU_REG_OFFSET_USR 0
30 #define VCPU_REG_OFFSET_FIQ 1
31 #define VCPU_REG_OFFSET_IRQ 2
32 #define VCPU_REG_OFFSET_SVC 3
33 #define VCPU_REG_OFFSET_ABT 4
34 #define VCPU_REG_OFFSET_UND 5
35 #define REG_OFFSET(_reg) \
36 (offsetof(struct kvm_regs, _reg) / sizeof(u32))
37
38 #define USR_REG_OFFSET(_num) REG_OFFSET(usr_regs.uregs[_num])
39
40 static const unsigned long vcpu_reg_offsets[VCPU_NR_MODES][15] = {
41 /* USR/SYS Registers */
42 [VCPU_REG_OFFSET_USR] = {
43 USR_REG_OFFSET(0), USR_REG_OFFSET(1), USR_REG_OFFSET(2),
44 USR_REG_OFFSET(3), USR_REG_OFFSET(4), USR_REG_OFFSET(5),
45 USR_REG_OFFSET(6), USR_REG_OFFSET(7), USR_REG_OFFSET(8),
46 USR_REG_OFFSET(9), USR_REG_OFFSET(10), USR_REG_OFFSET(11),
47 USR_REG_OFFSET(12), USR_REG_OFFSET(13), USR_REG_OFFSET(14),
48 },
49
50 /* FIQ Registers */
51 [VCPU_REG_OFFSET_FIQ] = {
52 USR_REG_OFFSET(0), USR_REG_OFFSET(1), USR_REG_OFFSET(2),
53 USR_REG_OFFSET(3), USR_REG_OFFSET(4), USR_REG_OFFSET(5),
54 USR_REG_OFFSET(6), USR_REG_OFFSET(7),
55 REG_OFFSET(fiq_regs[0]), /* r8 */
56 REG_OFFSET(fiq_regs[1]), /* r9 */
57 REG_OFFSET(fiq_regs[2]), /* r10 */
58 REG_OFFSET(fiq_regs[3]), /* r11 */
59 REG_OFFSET(fiq_regs[4]), /* r12 */
60 REG_OFFSET(fiq_regs[5]), /* r13 */
61 REG_OFFSET(fiq_regs[6]), /* r14 */
62 },
63
64 /* IRQ Registers */
65 [VCPU_REG_OFFSET_IRQ] = {
66 USR_REG_OFFSET(0), USR_REG_OFFSET(1), USR_REG_OFFSET(2),
67 USR_REG_OFFSET(3), USR_REG_OFFSET(4), USR_REG_OFFSET(5),
68 USR_REG_OFFSET(6), USR_REG_OFFSET(7), USR_REG_OFFSET(8),
69 USR_REG_OFFSET(9), USR_REG_OFFSET(10), USR_REG_OFFSET(11),
70 USR_REG_OFFSET(12),
71 REG_OFFSET(irq_regs[0]), /* r13 */
72 REG_OFFSET(irq_regs[1]), /* r14 */
73 },
74
75 /* SVC Registers */
76 [VCPU_REG_OFFSET_SVC] = {
77 USR_REG_OFFSET(0), USR_REG_OFFSET(1), USR_REG_OFFSET(2),
78 USR_REG_OFFSET(3), USR_REG_OFFSET(4), USR_REG_OFFSET(5),
79 USR_REG_OFFSET(6), USR_REG_OFFSET(7), USR_REG_OFFSET(8),
80 USR_REG_OFFSET(9), USR_REG_OFFSET(10), USR_REG_OFFSET(11),
81 USR_REG_OFFSET(12),
82 REG_OFFSET(svc_regs[0]), /* r13 */
83 REG_OFFSET(svc_regs[1]), /* r14 */
84 },
85
86 /* ABT Registers */
87 [VCPU_REG_OFFSET_ABT] = {
88 USR_REG_OFFSET(0), USR_REG_OFFSET(1), USR_REG_OFFSET(2),
89 USR_REG_OFFSET(3), USR_REG_OFFSET(4), USR_REG_OFFSET(5),
90 USR_REG_OFFSET(6), USR_REG_OFFSET(7), USR_REG_OFFSET(8),
91 USR_REG_OFFSET(9), USR_REG_OFFSET(10), USR_REG_OFFSET(11),
92 USR_REG_OFFSET(12),
93 REG_OFFSET(abt_regs[0]), /* r13 */
94 REG_OFFSET(abt_regs[1]), /* r14 */
95 },
96
97 /* UND Registers */
98 [VCPU_REG_OFFSET_UND] = {
99 USR_REG_OFFSET(0), USR_REG_OFFSET(1), USR_REG_OFFSET(2),
100 USR_REG_OFFSET(3), USR_REG_OFFSET(4), USR_REG_OFFSET(5),
101 USR_REG_OFFSET(6), USR_REG_OFFSET(7), USR_REG_OFFSET(8),
102 USR_REG_OFFSET(9), USR_REG_OFFSET(10), USR_REG_OFFSET(11),
103 USR_REG_OFFSET(12),
104 REG_OFFSET(und_regs[0]), /* r13 */
105 REG_OFFSET(und_regs[1]), /* r14 */
106 },
107 };
108
109 /*
110 * Return a pointer to the register number valid in the current mode of
111 * the virtual CPU.
112 */
vcpu_reg(struct kvm_vcpu * vcpu,u8 reg_num)113 unsigned long *vcpu_reg(struct kvm_vcpu *vcpu, u8 reg_num)
114 {
115 unsigned long *reg_array = (unsigned long *)&vcpu->arch.ctxt.gp_regs;
116 unsigned long mode = *vcpu_cpsr(vcpu) & MODE_MASK;
117
118 switch (mode) {
119 case USR_MODE...SVC_MODE:
120 mode &= ~MODE32_BIT; /* 0 ... 3 */
121 break;
122
123 case ABT_MODE:
124 mode = VCPU_REG_OFFSET_ABT;
125 break;
126
127 case UND_MODE:
128 mode = VCPU_REG_OFFSET_UND;
129 break;
130
131 case SYSTEM_MODE:
132 mode = VCPU_REG_OFFSET_USR;
133 break;
134
135 default:
136 BUG();
137 }
138
139 return reg_array + vcpu_reg_offsets[mode][reg_num];
140 }
141
142 /*
143 * Return the SPSR for the current mode of the virtual CPU.
144 */
__vcpu_spsr(struct kvm_vcpu * vcpu)145 unsigned long *__vcpu_spsr(struct kvm_vcpu *vcpu)
146 {
147 unsigned long mode = *vcpu_cpsr(vcpu) & MODE_MASK;
148 switch (mode) {
149 case SVC_MODE:
150 return &vcpu->arch.ctxt.gp_regs.KVM_ARM_SVC_spsr;
151 case ABT_MODE:
152 return &vcpu->arch.ctxt.gp_regs.KVM_ARM_ABT_spsr;
153 case UND_MODE:
154 return &vcpu->arch.ctxt.gp_regs.KVM_ARM_UND_spsr;
155 case IRQ_MODE:
156 return &vcpu->arch.ctxt.gp_regs.KVM_ARM_IRQ_spsr;
157 case FIQ_MODE:
158 return &vcpu->arch.ctxt.gp_regs.KVM_ARM_FIQ_spsr;
159 default:
160 BUG();
161 }
162 }
163
164 /******************************************************************************
165 * Inject exceptions into the guest
166 */
167
168 /**
169 * kvm_inject_vabt - inject an async abort / SError into the guest
170 * @vcpu: The VCPU to receive the exception
171 *
172 * It is assumed that this code is called from the VCPU thread and that the
173 * VCPU therefore is not currently executing guest code.
174 */
kvm_inject_vabt(struct kvm_vcpu * vcpu)175 void kvm_inject_vabt(struct kvm_vcpu *vcpu)
176 {
177 *vcpu_hcr(vcpu) |= HCR_VA;
178 }
179
