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2072d29c46
The current handling of AArch32 trapping is slightly less than perfect, as it is not possible (from a handler point of view) to distinguish it from an AArch64 access, nor to tell a 32bit from a 64bit access either. Fix this by introducing two additional flags: - is_aarch32: true if the access was made in AArch32 mode - is_32bit: true if is_aarch32 == true and a MCR/MRC instruction was used to perform the access (as opposed to MCRR/MRRC). This allows a handler to cover all the possible conditions in which a system register gets trapped. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Acked-by: Christoffer Dall <christoffer.dall@linaro.org>
141 lines
3.5 KiB
C
141 lines
3.5 KiB
C
/*
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* Copyright (C) 2012,2013 - ARM Ltd
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* Author: Marc Zyngier <marc.zyngier@arm.com>
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*
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* Derived from arch/arm/kvm/coproc.h
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* Copyright (C) 2012 - Virtual Open Systems and Columbia University
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* Authors: Christoffer Dall <c.dall@virtualopensystems.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License, version 2, as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __ARM64_KVM_SYS_REGS_LOCAL_H__
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#define __ARM64_KVM_SYS_REGS_LOCAL_H__
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struct sys_reg_params {
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u8 Op0;
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u8 Op1;
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u8 CRn;
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u8 CRm;
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u8 Op2;
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u8 Rt;
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bool is_write;
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bool is_aarch32;
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bool is_32bit; /* Only valid if is_aarch32 is true */
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};
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struct sys_reg_desc {
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/* MRS/MSR instruction which accesses it. */
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u8 Op0;
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u8 Op1;
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u8 CRn;
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u8 CRm;
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u8 Op2;
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/* Trapped access from guest, if non-NULL. */
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bool (*access)(struct kvm_vcpu *,
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const struct sys_reg_params *,
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const struct sys_reg_desc *);
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/* Initialization for vcpu. */
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void (*reset)(struct kvm_vcpu *, const struct sys_reg_desc *);
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/* Index into sys_reg[], or 0 if we don't need to save it. */
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int reg;
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/* Value (usually reset value) */
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u64 val;
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};
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static inline void print_sys_reg_instr(const struct sys_reg_params *p)
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{
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/* Look, we even formatted it for you to paste into the table! */
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kvm_pr_unimpl(" { Op0(%2u), Op1(%2u), CRn(%2u), CRm(%2u), Op2(%2u), func_%s },\n",
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p->Op0, p->Op1, p->CRn, p->CRm, p->Op2, p->is_write ? "write" : "read");
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}
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static inline bool ignore_write(struct kvm_vcpu *vcpu,
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const struct sys_reg_params *p)
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{
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return true;
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}
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static inline bool read_zero(struct kvm_vcpu *vcpu,
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const struct sys_reg_params *p)
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{
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*vcpu_reg(vcpu, p->Rt) = 0;
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return true;
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}
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static inline bool write_to_read_only(struct kvm_vcpu *vcpu,
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const struct sys_reg_params *params)
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{
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kvm_debug("sys_reg write to read-only register at: %lx\n",
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*vcpu_pc(vcpu));
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print_sys_reg_instr(params);
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return false;
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}
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static inline bool read_from_write_only(struct kvm_vcpu *vcpu,
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const struct sys_reg_params *params)
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{
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kvm_debug("sys_reg read to write-only register at: %lx\n",
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*vcpu_pc(vcpu));
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print_sys_reg_instr(params);
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return false;
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}
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/* Reset functions */
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static inline void reset_unknown(struct kvm_vcpu *vcpu,
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const struct sys_reg_desc *r)
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{
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BUG_ON(!r->reg);
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BUG_ON(r->reg >= NR_SYS_REGS);
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vcpu_sys_reg(vcpu, r->reg) = 0x1de7ec7edbadc0deULL;
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}
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static inline void reset_val(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r)
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{
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BUG_ON(!r->reg);
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BUG_ON(r->reg >= NR_SYS_REGS);
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vcpu_sys_reg(vcpu, r->reg) = r->val;
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}
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static inline int cmp_sys_reg(const struct sys_reg_desc *i1,
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const struct sys_reg_desc *i2)
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{
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BUG_ON(i1 == i2);
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if (!i1)
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return 1;
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else if (!i2)
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return -1;
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if (i1->Op0 != i2->Op0)
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return i1->Op0 - i2->Op0;
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if (i1->Op1 != i2->Op1)
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return i1->Op1 - i2->Op1;
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if (i1->CRn != i2->CRn)
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return i1->CRn - i2->CRn;
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if (i1->CRm != i2->CRm)
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return i1->CRm - i2->CRm;
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return i1->Op2 - i2->Op2;
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}
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#define Op0(_x) .Op0 = _x
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#define Op1(_x) .Op1 = _x
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#define CRn(_x) .CRn = _x
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#define CRm(_x) .CRm = _x
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#define Op2(_x) .Op2 = _x
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#endif /* __ARM64_KVM_SYS_REGS_LOCAL_H__ */
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