/*
* Copyright (C) 2012,2013 - ARM Ltd
* Author: Marc Zyngier <marc.zyngier@arm.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/linkage.h>
#include <asm/assembler.h>
#include <asm/memory.h>
#include <asm/asm-offsets.h>
#include <asm/debug-monitors.h>
#include <asm/fpsimdmacros.h>
#include <asm/kvm.h>
#include <asm/kvm_asm.h>
#include <asm/kvm_arm.h>
#include <asm/kvm_mmu.h>
#define CPU_GP_REG_OFFSET(x) (CPU_GP_REGS + x)
#define CPU_XREG_OFFSET(x) CPU_GP_REG_OFFSET(CPU_USER_PT_REGS + 8*x)
#define CPU_SPSR_OFFSET(x) CPU_GP_REG_OFFSET(CPU_SPSR + 8*x)
#define CPU_SYSREG_OFFSET(x) (CPU_SYSREGS + 8*x)
.text
.pushsection .hyp.text, "ax"
.align PAGE_SHIFT
.macro save_common_regs
// x2: base address for cpu context
// x3: tmp register
add x3, x2, #CPU_XREG_OFFSET(19)
stp x19, x20, [x3]
stp x21, x22, [x3, #16]
stp x23, x24, [x3, #32]
stp x25, x26, [x3, #48]
stp x27, x28, [x3, #64]
stp x29, lr, [x3, #80]
mrs x19, sp_el0
mrs x20, elr_el2 // EL1 PC
mrs x21, spsr_el2 // EL1 pstate
stp x19, x20, [x3, #96]
str x21, [x3, #112]
mrs x22, sp_el1
mrs x23, elr_el1
mrs x24, spsr_el1
str x22, [x2, #CPU_GP_REG_OFFSET(CPU_SP_EL1)]
str x23, [x2, #CPU_GP_REG_OFFSET(CPU_ELR_EL1)]
str x24, [x2, #CPU_SPSR_OFFSET(KVM_SPSR_EL1)]
.endm
.macro restore_common_regs
// x2: base address for cpu context
// x3: tmp register
ldr x22, [x2, #CPU_GP_REG_OFFSET(CPU_SP_EL1)]
ldr x23, [x2, #CPU_GP_REG_OFFSET(CPU_ELR_EL1)]
ldr x24, [x2, #CPU_SPSR_OFFSET(KVM_SPSR_EL1)]
msr sp_el1, x22
msr elr_el1, x23
msr spsr_el1, x24
add x3, x2, #CPU_XREG_OFFSET(31) // SP_EL0
ldp x19, x20, [x3]
ldr x21, [x3, #16]
msr sp_el0, x19
msr elr_el2, x20 // EL1 PC
msr spsr_el2, x21 // EL1 pstate
add x3, x2, #CPU_XREG_OFFSET(19)
ldp x19, x20, [x3]
ldp x21, x22, [x3, #16]
ldp x23, x24, [x3, #32]
ldp x25, x26, [x3, #48]
ldp x27, x28, [x3, #64]
ldp x29, lr, [x3, #80]
.endm
.macro save_host_regs
save_common_regs
.endm
.macro restore_host_regs
restore_common_regs
.endm
.macro save_fpsimd
// x2: cpu context address
// x3, x4: tmp regs
add x3, x2, #CPU_GP_REG_OFFSET(CPU_FP_REGS)
fpsimd_save x3, 4
.endm
.macro restore_fpsimd
// x2: cpu context address
// x3, x4: tmp regs
add x3, x2, #CPU_GP_REG_OFFSET(CPU_FP_REGS)
fpsimd_restore x3, 4
.endm
.macro save_guest_regs
// x0 is the vcpu address
// x1 is the return code, do not corrupt!
// x2 is the cpu context
// x3 is a tmp register
// Guest's x0-x3 are on the stack
// Compute base to save registers
add x3, x2, #CPU_XREG_OFFSET(4)
stp x4, x5, [x3]
stp x6, x7, [x3, #16]
stp x8, x9, [x3, #32]
stp x10, x11, [x3, #48]
stp x12, x13, [x3, #64]
stp x14, x15, [x3, #80]
stp x16, x17, [x3, #96]
str x18, [x3, #112]
pop x6, x7 // x2, x3
pop x4, x5 // x0, x1
add x3, x2, #CPU_XREG_OFFSET(0)
stp x4, x5, [x3]
stp x6, x7, [x3, #16]
save_common_regs
.endm
.macro restore_guest_regs
// x0 is the vcpu address.
// x2 is the cpu context
// x3 is a tmp register
// Prepare x0-x3 for later restore
add x3, x2, #CPU_XREG_OFFSET(0)
ldp x4, x5, [x3]
ldp x6, x7, [x3, #16]
push x4, x5 // Push x0-x3 on the stack
push x6, x7
// x4-x18
ldp x4, x5, [x3, #32]
ldp x6, x7, [x3, #48]
ldp x8, x9, [x3, #64]
ldp x10, x11, [x3, #80]
ldp x12, x13, [x3, #96]
ldp x14, x15, [x3, #112]
ldp x16, x17, [x3, #128]
ldr x18, [x3, #144]
// x19-x29, lr, sp*, elr*, spsr*
restore_common_regs
// Last bits of the 64bit state
pop x2, x3
pop x0, x1
// Do not touch any register after this!
.endm
/*
* Macros to perform system register save/restore.
*
* Ordering here is absolutely critical, and must be kept consistent
* in {save,restore}_sysregs, {save,restore}_guest_32bit_state,
* and in kvm_asm.h.
*
* In other words, don't touch any of these unless you know what
* you are doing.
*/
.macro save_sysregs
// x2: base address for cpu context
// x3: tmp register
add x3, x2, #CPU_SYSREG_OFFSET(MPIDR_EL1)
mrs x4, vmpidr_el2
mrs x5, csselr_el1
mrs x6, sctlr_el1
mrs x7, actlr_el1
mrs x8, cpacr_el1
mrs x9, ttbr0_el1
mrs x10, ttbr1_el1
mrs x11, tcr_el1
mrs x12, esr_el1
mrs x13, afsr0_el1
mrs x14, afsr1_el1
mrs x15, far_el1
mrs x16, mair_el1
mrs x17, vbar_el1
mrs x18, contextidr_el1
mrs x19, tpidr_el0
mrs x20, tpidrro_el0
mrs x21, tpidr_el1
mrs x22, amair_el1
mrs x23, cntkctl_el1
mrs x24, par_el1
mrs x25, mdscr_el1
stp x4, x5, [x3]
stp x6, x7, [x3, #16]
stp x8, x9, [x3, #32]
stp x10, x11, [x3, #48]
stp x12, x13, [x3, #64]
stp x14, x15, [x3, #80]
stp x16, x17, [x3, #96]
stp x18, x19, [x3, #112]
stp x20, x21, [x3, #128]
stp x22, x23, [x3, #144]
stp x24, x25, [x3, #160]
.endm
.macro save_debug
// x2: base address for cpu context
// x3: tmp register
mrs x26, id_aa64dfr0_el1
ubfx x24, x26, #12, #4 // Extract BRPs
ubfx x25, x26, #20, #4 // Extract WRPs
mov w26, #15
sub w24, w26, w24 // How many BPs to skip
sub w25, w26, w25 // How many WPs to skip
add x3, x2, #CPU_SYSREG_OFFSET(DBGBCR0_EL1)
adr x26, 1f
add x26, x26, x24, lsl #2
br x26
1:
mrs x20, dbgbcr15_el1
mrs x19, dbgbcr14_el1
mrs x18, dbgbcr13_el1
mrs x17, dbgbcr12_el1
mrs x16, dbgbcr11_el1
mrs x15, dbgbcr10_el1
mrs x14, dbgbcr9_el1
mrs x13, dbgbcr8_el1
mrs x12, dbgbcr7_el1
mrs x11, dbgbcr6_el1
mrs x10, dbgbcr5_el1
mrs x9, dbgbcr4_el1
mrs x8, dbgbcr3_el1
mrs x7, dbgbcr2_el1
mrs x6, dbgbcr1_el1
mrs x5, dbgbcr0_el1
adr x26, 1f
add x26, x26, x24, lsl #2
br x26
1:
str x20, [x3, #(15 * 8)]
str x19, [x3, #(14 * 8)]
str x18, [x3, #(13 * 8)]
str x17, [x3, #(12 * 8)]
str x16, [x3, #(11 * 8)]
str x15, [x3, #(10 * 8)]
str x14, [x3, #(9 * 8)]
str x13, [x3, #(8 * 8)]
str x12, [x3, #(7 * 8)]
str x11, [x3, #(6 * 8)]
str x10, [x3, #(5 * 8)]
str x9, [x3, #(4 * 8)]
str x8, [x3, #(3 * 8)]
str x7, [x3, #(2 * 8)]
str x6, [x3, #(1 * 8)]
str x5, [x3, #(0 * 8)]
add x3, x2, #CPU_SYSREG_OFFSET(DBGBVR0_EL1)
adr x26, 1f
add x26, x26, x24, lsl #2
br x26
1:
mrs x20, dbgbvr15_el1
mrs x19, dbgbvr14_el1
mrs x18, dbgbvr13_el1
mrs x17, dbgbvr12_el1
mrs x16, dbgbvr11_el1
mrs x15, dbgbvr10_el1
mrs x14, dbgbvr9_el1
mrs x13, dbgbvr8_el1
mrs x12, dbgbvr7_el1
mrs x11, dbgbvr6_el1
mrs x10, dbgbvr5_el1
mrs x9, dbgbvr4_el1
mrs x8, dbgbvr3_el1
mrs x7, dbgbvr2_el1
mrs x6, dbgbvr1_el1
mrs x5, dbgbvr0_el1
adr x26, 1f
add x26, x26, x24, lsl #2
br x26
1:
str x20, [x3, #(15 * 8)]
str x19, [x3, #(14 * 8)]
str x18, [x3, #(13 * 8)]
str x17, [x3, #(12 * 8)]
str x16, [x3, #(11 * 8)]
str x15, [x3, #(10 * 8)]
str x14, [x3, #(9 * 8)]
str x13, [x3, #(8 * 8)]
str x12, [x3, #(7 * 8)]
str x11, [x3, #(6 * 8)]
str x10, [x3, #(5 * 8)]
str x9, [x3, #(4 * 8)]
str x8, [x3, #(3 * 8)]
str x7, [x3, #(2 * 8)]
str x6, [x3, #(1 * 8)]
str x5, [x3, #(0 * 8)]
add x3, x2, #CPU_SYSREG_OFFSET(DBGWCR0_EL1)
adr x26, 1f
add x26, x26, x25, lsl #2
br x26
1:
mrs x20, dbgwcr15_el1
mrs x19, dbgwcr14_el1
mrs x18, dbgwcr13_el1
mrs x17, dbgwcr12_el1
mrs x16, dbgwcr11_el1
mrs x15, dbgwcr10_el1
mrs x14, dbgwcr9_el1
mrs x13, dbgwcr8_el1
mrs x12, dbgwcr7_el1
mrs x11, dbgwcr6_el1
mrs x10, dbgwcr5_el1
mrs x9, dbgwcr4_el1
mrs x8, dbgwcr3_el1
mrs x7, dbgwcr2_el1
mrs x6, dbgwcr1_el1
mrs x5, dbgwcr0_el1
adr x26, 1f
add x26, x26, x25, lsl #2
br x26
1:
str x20, [x3, #(15 * 8)]
str x19, [x3, #(14 * 8)]
str x18, [x3, #(13 * 8)]
str x17, [x3, #(12 * 8)]
str x16, [x3, #(11 * 8)]
str x15, [x3, #(10 * 8)]
str x14, [x3, #(9 * 8)]
str x13, [x3
