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/*
* (not much of an) Emulation layer for 32bit guests.
*
* Copyright (C) 2012,2013 - ARM Ltd
* Author: Marc Zyngier <marc.zyngier@arm.com>
*
* based on 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/kvm_host.h>
#include <asm/kvm_emulate.h>
#include <asm/kvm_hyp.h>
/*
* Table taken from ARMv8 ARM DDI0487B-B, table G1-10.
*/
static const u8 return_offsets[8][2] = {
[0] = { 0, 0 }, /* Reset, unused */
[1] = { 4, 2 }, /* Undefined */
[2] = { 0, 0 }, /* SVC, unused */
[3] = { 4, 4 }, /* Prefetch abort */
[4] = { 8, 8 }, /* Data abort */
[5] = { 0, 0 }, /* HVC, unused */
[6] = { 4, 4 }, /* IRQ, unused */
[7] = { 4, 4 }, /* FIQ, unused */
};
static void prepare_fault32(struct kvm_vcpu *vcpu, u32 mode, u32 vect_offset)
{
unsigned long cpsr;
unsigned long new_spsr_value = *vcpu_cpsr(vcpu);
bool is_thumb = (new_spsr_value & PSR_AA32_T_BIT);
u32 return_offset = return_offsets[vect_offset >> 2][is_thumb];
u32 sctlr = vcpu_cp15(vcpu, c1_SCTLR);
cpsr = mode | PSR_AA32_I_BIT;
if (sctlr & (1 << 30))
cpsr |= PSR_AA32_T_BIT;
if (sctlr & (1 << 25))
cpsr |= PSR_AA32_E_BIT;
*vcpu_cpsr(vcpu) = cpsr;
/* Note: These now point to the banked copies */
vcpu_write_spsr(vcpu, new_spsr_value);
*vcpu_reg32(vcpu, 14) = *vcpu_pc(vcpu) + return_offset;
/* Branch to exception vector */
if (sctlr & (1 << 13))
vect_offset += 0xffff0000;
else /* always have security exceptions */
vect_offset += vcpu_cp15(vcpu, c12_VBAR);
*vcpu_pc(vcpu) = vect_offset;
}
void kvm_inject_undef32(struct kvm_vcpu *vcpu)
{
prepare_fault32(vcpu, PSR_AA32_MODE_UND, 4);
}
/*
* Modelled after TakeDataAbortException() and TakePrefetchAbortException
* pseudocode.
*/
static void inject_abt32(struct kvm_vcpu *vcpu, bool is_pabt,
unsigned long addr)
{
u32 vect_offset;
u32 *far, *fsr;
bool is_lpae;
if (is_pabt) {
vect_offset = 12;
far = &vcpu_cp15(vcpu, c6_IFAR);
fsr = &vcpu_cp15(vcpu, c5_IFSR);
} else { /* !iabt */
vect_offset = 16;
far = &vcpu_cp15(vcpu, c6_DFAR);
fsr = &vcpu_cp15(vcpu, c5_DFSR);
}
prepare_fault32(vcpu, PSR_AA32_MODE_ABT | PSR_AA32_A_BIT, vect_offset);
*far = addr;
/* Give the guest an IMPLEMENTATION DEFINED exception */
is_lpae = (vcpu_cp15(vcpu, c2_TTBCR) >> 31);
if (is_lpae)
*fsr = 1 << 9 | 0x34;
else
*fsr = 0x14;
}
void kvm_inject_dabt32(struct kvm_vcpu *vcpu, unsigned long addr)
{
inject_abt32(vcpu, false, addr);
}
void kvm_inject_pabt32(struct kvm_vcpu *vcpu, unsigned long addr)
{
inject_abt32(vcpu, true, addr);
}
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