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-rw-r--r--arch/arm64/kvm/regmap.c168
1 files changed, 168 insertions, 0 deletions
diff --git a/arch/arm64/kvm/regmap.c b/arch/arm64/kvm/regmap.c
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+++ b/arch/arm64/kvm/regmap.c
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+/*
+ * Copyright (C) 2012,2013 - ARM Ltd
+ * Author: Marc Zyngier <marc.zyngier@arm.com>
+ *
+ * Derived from arch/arm/kvm/emulate.c:
+ * Copyright (C) 2012 - Virtual Open Systems and Columbia University
+ * Author: Christoffer Dall <c.dall@virtualopensystems.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/mm.h>
+#include <linux/kvm_host.h>
+#include <asm/kvm_emulate.h>
+#include <asm/ptrace.h>
+
+#define VCPU_NR_MODES 6
+#define REG_OFFSET(_reg) \
+ (offsetof(struct user_pt_regs, _reg) / sizeof(unsigned long))
+
+#define USR_REG_OFFSET(R) REG_OFFSET(compat_usr(R))
+
+static const unsigned long vcpu_reg_offsets[VCPU_NR_MODES][16] = {
+ /* USR Registers */
+ {
+ USR_REG_OFFSET(0), USR_REG_OFFSET(1), USR_REG_OFFSET(2),
+ USR_REG_OFFSET(3), USR_REG_OFFSET(4), USR_REG_OFFSET(5),
+ USR_REG_OFFSET(6), USR_REG_OFFSET(7), USR_REG_OFFSET(8),
+ USR_REG_OFFSET(9), USR_REG_OFFSET(10), USR_REG_OFFSET(11),
+ USR_REG_OFFSET(12), USR_REG_OFFSET(13), USR_REG_OFFSET(14),
+ REG_OFFSET(pc)
+ },
+
+ /* FIQ Registers */
+ {
+ USR_REG_OFFSET(0), USR_REG_OFFSET(1), USR_REG_OFFSET(2),
+ USR_REG_OFFSET(3), USR_REG_OFFSET(4), USR_REG_OFFSET(5),
+ USR_REG_OFFSET(6), USR_REG_OFFSET(7),
+ REG_OFFSET(compat_r8_fiq), /* r8 */
+ REG_OFFSET(compat_r9_fiq), /* r9 */
+ REG_OFFSET(compat_r10_fiq), /* r10 */
+ REG_OFFSET(compat_r11_fiq), /* r11 */
+ REG_OFFSET(compat_r12_fiq), /* r12 */
+ REG_OFFSET(compat_sp_fiq), /* r13 */
+ REG_OFFSET(compat_lr_fiq), /* r14 */
+ REG_OFFSET(pc)
+ },
+
+ /* IRQ Registers */
+ {
+ USR_REG_OFFSET(0), USR_REG_OFFSET(1), USR_REG_OFFSET(2),
+ USR_REG_OFFSET(3), USR_REG_OFFSET(4), USR_REG_OFFSET(5),
+ USR_REG_OFFSET(6), USR_REG_OFFSET(7), USR_REG_OFFSET(8),
+ USR_REG_OFFSET(9), USR_REG_OFFSET(10), USR_REG_OFFSET(11),
+ USR_REG_OFFSET(12),
+ REG_OFFSET(compat_sp_irq), /* r13 */
+ REG_OFFSET(compat_lr_irq), /* r14 */
+ REG_OFFSET(pc)
+ },
+
+ /* SVC Registers */
+ {
+ USR_REG_OFFSET(0), USR_REG_OFFSET(1), USR_REG_OFFSET(2),
+ USR_REG_OFFSET(3), USR_REG_OFFSET(4), USR_REG_OFFSET(5),
+ USR_REG_OFFSET(6), USR_REG_OFFSET(7), USR_REG_OFFSET(8),
+ USR_REG_OFFSET(9), USR_REG_OFFSET(10), USR_REG_OFFSET(11),
+ USR_REG_OFFSET(12),
+ REG_OFFSET(compat_sp_svc), /* r13 */
+ REG_OFFSET(compat_lr_svc), /* r14 */
+ REG_OFFSET(pc)
+ },
+
+ /* ABT Registers */
+ {
+ USR_REG_OFFSET(0), USR_REG_OFFSET(1), USR_REG_OFFSET(2),
+ USR_REG_OFFSET(3), USR_REG_OFFSET(4), USR_REG_OFFSET(5),
+ USR_REG_OFFSET(6), USR_REG_OFFSET(7), USR_REG_OFFSET(8),
+ USR_REG_OFFSET(9), USR_REG_OFFSET(10), USR_REG_OFFSET(11),
+ USR_REG_OFFSET(12),
+ REG_OFFSET(compat_sp_abt), /* r13 */
+ REG_OFFSET(compat_lr_abt), /* r14 */
+ REG_OFFSET(pc)
+ },
+
+ /* UND Registers */
+ {
+ USR_REG_OFFSET(0), USR_REG_OFFSET(1), USR_REG_OFFSET(2),
+ USR_REG_OFFSET(3), USR_REG_OFFSET(4), USR_REG_OFFSET(5),
+ USR_REG_OFFSET(6), USR_REG_OFFSET(7), USR_REG_OFFSET(8),
+ USR_REG_OFFSET(9), USR_REG_OFFSET(10), USR_REG_OFFSET(11),
+ USR_REG_OFFSET(12),
+ REG_OFFSET(compat_sp_und), /* r13 */
+ REG_OFFSET(compat_lr_und), /* r14 */
+ REG_OFFSET(pc)
+ },
+};
+
+/*
+ * Return a pointer to the register number valid in the current mode of
+ * the virtual CPU.
+ */
+unsigned long *vcpu_reg32(const struct kvm_vcpu *vcpu, u8 reg_num)
+{
+ unsigned long *reg_array = (unsigned long *)&vcpu->arch.ctxt.gp_regs.regs;
+ unsigned long mode = *vcpu_cpsr(vcpu) & COMPAT_PSR_MODE_MASK;
+
+ switch (mode) {
+ case COMPAT_PSR_MODE_USR ... COMPAT_PSR_MODE_SVC:
+ mode &= ~PSR_MODE32_BIT; /* 0 ... 3 */
+ break;
+
+ case COMPAT_PSR_MODE_ABT:
+ mode = 4;
+ break;
+
+ case COMPAT_PSR_MODE_UND:
+ mode = 5;
+ break;
+
+ case COMPAT_PSR_MODE_SYS:
+ mode = 0; /* SYS maps to USR */
+ break;
+
+ default:
+ BUG();
+ }
+
+ return reg_array + vcpu_reg_offsets[mode][reg_num];
+}
+
+/*
+ * Return the SPSR for the current mode of the virtual CPU.
+ */
+unsigned long *vcpu_spsr32(const struct kvm_vcpu *vcpu)
+{
+ unsigned long mode = *vcpu_cpsr(vcpu) & COMPAT_PSR_MODE_MASK;
+ switch (mode) {
+ case COMPAT_PSR_MODE_SVC:
+ mode = KVM_SPSR_SVC;
+ break;
+ case COMPAT_PSR_MODE_ABT:
+ mode = KVM_SPSR_ABT;
+ break;
+ case COMPAT_PSR_MODE_UND:
+ mode = KVM_SPSR_UND;
+ break;
+ case COMPAT_PSR_MODE_IRQ:
+ mode = KVM_SPSR_IRQ;
+ break;
+ case COMPAT_PSR_MODE_FIQ:
+ mode = KVM_SPSR_FIQ;
+ break;
+ default:
+ BUG();
+ }
+
+ return (unsigned long *)&vcpu_gp_regs(vcpu)->spsr[mode];
+}
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