diff options
Diffstat (limited to 'arch/arm/kvm/emulate.c')
| -rw-r--r-- | arch/arm/kvm/emulate.c | 155 |
1 files changed, 155 insertions, 0 deletions
diff --git a/arch/arm/kvm/emulate.c b/arch/arm/kvm/emulate.c new file mode 100644 index 00000000000..3eadc25e95d --- /dev/null +++ b/arch/arm/kvm/emulate.c @@ -0,0 +1,155 @@ +/* + * 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, write to the Free Software + * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + */ + +#include <asm/kvm_emulate.h> + +#define VCPU_NR_MODES 6 +#define VCPU_REG_OFFSET_USR 0 +#define VCPU_REG_OFFSET_FIQ 1 +#define VCPU_REG_OFFSET_IRQ 2 +#define VCPU_REG_OFFSET_SVC 3 +#define VCPU_REG_OFFSET_ABT 4 +#define VCPU_REG_OFFSET_UND 5 +#define REG_OFFSET(_reg) \ + (offsetof(struct kvm_regs, _reg) / sizeof(u32)) + +#define USR_REG_OFFSET(_num) REG_OFFSET(usr_regs.uregs[_num]) + +static const unsigned long vcpu_reg_offsets[VCPU_NR_MODES][15] = { + /* USR/SYS Registers */ + [VCPU_REG_OFFSET_USR] = { + 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), + }, + + /* FIQ Registers */ + [VCPU_REG_OFFSET_FIQ] = { + 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(fiq_regs[0]), /* r8 */ + REG_OFFSET(fiq_regs[1]), /* r9 */ + REG_OFFSET(fiq_regs[2]), /* r10 */ + REG_OFFSET(fiq_regs[3]), /* r11 */ + REG_OFFSET(fiq_regs[4]), /* r12 */ + REG_OFFSET(fiq_regs[5]), /* r13 */ + REG_OFFSET(fiq_regs[6]), /* r14 */ + }, + + /* IRQ Registers */ + [VCPU_REG_OFFSET_IRQ] = { + 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(irq_regs[0]), /* r13 */ + REG_OFFSET(irq_regs[1]), /* r14 */ + }, + + /* SVC Registers */ + [VCPU_REG_OFFSET_SVC] = { + 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(svc_regs[0]), /* r13 */ + REG_OFFSET(svc_regs[1]), /* r14 */ + }, + + /* ABT Registers */ + [VCPU_REG_OFFSET_ABT] = { + 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(abt_regs[0]), /* r13 */ + REG_OFFSET(abt_regs[1]), /* r14 */ + }, + + /* UND Registers */ + [VCPU_REG_OFFSET_UND] = { + 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(und_regs[0]), /* r13 */ + REG_OFFSET(und_regs[1]), /* r14 */ + }, +}; + +/* + * Return a pointer to the register number valid in the current mode of + * the virtual CPU. + */ +u32 *vcpu_reg(struct kvm_vcpu *vcpu, u8 reg_num) +{ + u32 *reg_array = (u32 *)&vcpu->arch.regs; + u32 mode = *vcpu_cpsr(vcpu) & MODE_MASK; + + switch (mode) { + case USR_MODE...SVC_MODE: + mode &= ~MODE32_BIT; /* 0 ... 3 */ + break; + + case ABT_MODE: + mode = VCPU_REG_OFFSET_ABT; + break; + + case UND_MODE: + mode = VCPU_REG_OFFSET_UND; + break; + + case SYSTEM_MODE: + mode = VCPU_REG_OFFSET_USR; + break; + + default: + BUG(); + } + + return reg_array + vcpu_reg_offsets[mode][reg_num]; +} + +/* + * Return the SPSR for the current mode of the virtual CPU. + */ +u32 *vcpu_spsr(struct kvm_vcpu *vcpu) +{ + u32 mode = *vcpu_cpsr(vcpu) & MODE_MASK; + switch (mode) { + case SVC_MODE: + return &vcpu->arch.regs.KVM_ARM_SVC_spsr; + case ABT_MODE: + return &vcpu->arch.regs.KVM_ARM_ABT_spsr; + case UND_MODE: + return &vcpu->arch.regs.KVM_ARM_UND_spsr; + case IRQ_MODE: + return &vcpu->arch.regs.KVM_ARM_IRQ_spsr; + case FIQ_MODE: + return &vcpu->arch.regs.KVM_ARM_FIQ_spsr; + default: + BUG(); + } +} |