2 * Copyright (C) 2012,2013 - ARM Ltd
3 * Author: Marc Zyngier <marc.zyngier@arm.com>
5 * Derived from arch/arm/kvm/emulate.c:
6 * Copyright (C) 2012 - Virtual Open Systems and Columbia University
7 * Author: Christoffer Dall <c.dall@virtualopensystems.com>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program. If not, see <http://www.gnu.org/licenses/>.
23 #include <linux/kvm_host.h>
24 #include <asm/kvm_emulate.h>
25 #include <asm/ptrace.h>
27 #define VCPU_NR_MODES 6
28 #define REG_OFFSET(_reg) \
29 (offsetof(struct user_pt_regs, _reg) / sizeof(unsigned long))
31 #define USR_REG_OFFSET(R) REG_OFFSET(compat_usr(R))
33 static const unsigned long vcpu_reg_offsets[VCPU_NR_MODES][16] = {
36 USR_REG_OFFSET(0), USR_REG_OFFSET(1), USR_REG_OFFSET(2),
37 USR_REG_OFFSET(3), USR_REG_OFFSET(4), USR_REG_OFFSET(5),
38 USR_REG_OFFSET(6), USR_REG_OFFSET(7), USR_REG_OFFSET(8),
39 USR_REG_OFFSET(9), USR_REG_OFFSET(10), USR_REG_OFFSET(11),
40 USR_REG_OFFSET(12), USR_REG_OFFSET(13), USR_REG_OFFSET(14),
46 USR_REG_OFFSET(0), USR_REG_OFFSET(1), USR_REG_OFFSET(2),
47 USR_REG_OFFSET(3), USR_REG_OFFSET(4), USR_REG_OFFSET(5),
48 USR_REG_OFFSET(6), USR_REG_OFFSET(7),
49 REG_OFFSET(compat_r8_fiq), /* r8 */
50 REG_OFFSET(compat_r9_fiq), /* r9 */
51 REG_OFFSET(compat_r10_fiq), /* r10 */
52 REG_OFFSET(compat_r11_fiq), /* r11 */
53 REG_OFFSET(compat_r12_fiq), /* r12 */
54 REG_OFFSET(compat_sp_fiq), /* r13 */
55 REG_OFFSET(compat_lr_fiq), /* r14 */
61 USR_REG_OFFSET(0), USR_REG_OFFSET(1), USR_REG_OFFSET(2),
62 USR_REG_OFFSET(3), USR_REG_OFFSET(4), USR_REG_OFFSET(5),
63 USR_REG_OFFSET(6), USR_REG_OFFSET(7), USR_REG_OFFSET(8),
64 USR_REG_OFFSET(9), USR_REG_OFFSET(10), USR_REG_OFFSET(11),
66 REG_OFFSET(compat_sp_irq), /* r13 */
67 REG_OFFSET(compat_lr_irq), /* r14 */
73 USR_REG_OFFSET(0), USR_REG_OFFSET(1), USR_REG_OFFSET(2),
74 USR_REG_OFFSET(3), USR_REG_OFFSET(4), USR_REG_OFFSET(5),
75 USR_REG_OFFSET(6), USR_REG_OFFSET(7), USR_REG_OFFSET(8),
76 USR_REG_OFFSET(9), USR_REG_OFFSET(10), USR_REG_OFFSET(11),
78 REG_OFFSET(compat_sp_svc), /* r13 */
79 REG_OFFSET(compat_lr_svc), /* r14 */
85 USR_REG_OFFSET(0), USR_REG_OFFSET(1), USR_REG_OFFSET(2),
86 USR_REG_OFFSET(3), USR_REG_OFFSET(4), USR_REG_OFFSET(5),
87 USR_REG_OFFSET(6), USR_REG_OFFSET(7), USR_REG_OFFSET(8),
88 USR_REG_OFFSET(9), USR_REG_OFFSET(10), USR_REG_OFFSET(11),
90 REG_OFFSET(compat_sp_abt), /* r13 */
91 REG_OFFSET(compat_lr_abt), /* r14 */
97 USR_REG_OFFSET(0), USR_REG_OFFSET(1), USR_REG_OFFSET(2),
98 USR_REG_OFFSET(3), USR_REG_OFFSET(4), USR_REG_OFFSET(5),
99 USR_REG_OFFSET(6), USR_REG_OFFSET(7), USR_REG_OFFSET(8),
100 USR_REG_OFFSET(9), USR_REG_OFFSET(10), USR_REG_OFFSET(11),
102 REG_OFFSET(compat_sp_und), /* r13 */
103 REG_OFFSET(compat_lr_und), /* r14 */
109 * Return a pointer to the register number valid in the current mode of
112 unsigned long *vcpu_reg32(const struct kvm_vcpu *vcpu, u8 reg_num)
114 unsigned long *reg_array = (unsigned long *)&vcpu->arch.ctxt.gp_regs.regs;
115 unsigned long mode = *vcpu_cpsr(vcpu) & COMPAT_PSR_MODE_MASK;
118 case COMPAT_PSR_MODE_USR ... COMPAT_PSR_MODE_SVC:
119 mode &= ~PSR_MODE32_BIT; /* 0 ... 3 */
122 case COMPAT_PSR_MODE_ABT:
126 case COMPAT_PSR_MODE_UND:
130 case COMPAT_PSR_MODE_SYS:
131 mode = 0; /* SYS maps to USR */
138 return reg_array + vcpu_reg_offsets[mode][reg_num];
142 * Return the SPSR for the current mode of the virtual CPU.
144 unsigned long *vcpu_spsr32(const struct kvm_vcpu *vcpu)
146 unsigned long mode = *vcpu_cpsr(vcpu) & COMPAT_PSR_MODE_MASK;
148 case COMPAT_PSR_MODE_SVC:
151 case COMPAT_PSR_MODE_ABT:
154 case COMPAT_PSR_MODE_UND:
157 case COMPAT_PSR_MODE_IRQ:
160 case COMPAT_PSR_MODE_FIQ:
167 return (unsigned long *)&vcpu_gp_regs(vcpu)->spsr[mode];