1/* 2 * Copyright (C) 2015 - ARM Ltd 3 * Author: Marc Zyngier <marc.zyngier@arm.com> 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License version 2 as 7 * published by the Free Software Foundation. 8 * 9 * This program is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 * GNU General Public License for more details. 13 * 14 * You should have received a copy of the GNU General Public License 15 * along with this program. If not, see <http://www.gnu.org/licenses/>. 16 */ 17 18#include <linux/linkage.h> 19 20#include <asm/alternative.h> 21#include <asm/assembler.h> 22#include <asm/cpufeature.h> 23#include <asm/kvm_arm.h> 24#include <asm/kvm_asm.h> 25#include <asm/kvm_mmu.h> 26 27 .text 28 .pushsection .hyp.text, "ax" 29 30.macro save_x0_to_x3 31 stp x0, x1, [sp, #-16]! 32 stp x2, x3, [sp, #-16]! 33.endm 34 35.macro restore_x0_to_x3 36 ldp x2, x3, [sp], #16 37 ldp x0, x1, [sp], #16 38.endm 39 40.macro do_el2_call 41 /* 42 * Shuffle the parameters before calling the function 43 * pointed to in x0. Assumes parameters in x[1,2,3]. 44 */ 45 sub sp, sp, #16 46 str lr, [sp] 47 mov lr, x0 48 mov x0, x1 49 mov x1, x2 50 mov x2, x3 51 blr lr 52 ldr lr, [sp] 53 add sp, sp, #16 54.endm 55 56ENTRY(__vhe_hyp_call) 57 do_el2_call 58 /* 59 * We used to rely on having an exception return to get 60 * an implicit isb. In the E2H case, we don't have it anymore. 61 * rather than changing all the leaf functions, just do it here 62 * before returning to the rest of the kernel. 63 */ 64 isb 65 ret 66ENDPROC(__vhe_hyp_call) 67 68el1_sync: // Guest trapped into EL2 69 save_x0_to_x3 70 71alternative_if_not ARM64_HAS_VIRT_HOST_EXTN 72 mrs x1, esr_el2 73alternative_else 74 mrs x1, esr_el1 75alternative_endif 76 lsr x2, x1, #ESR_ELx_EC_SHIFT 77 78 cmp x2, #ESR_ELx_EC_HVC64 79 b.ne el1_trap 80 81 mrs x3, vttbr_el2 // If vttbr is valid, the 64bit guest 82 cbnz x3, el1_trap // called HVC 83 84 /* Here, we're pretty sure the host called HVC. */ 85 restore_x0_to_x3 86 87 /* Check for __hyp_get_vectors */ 88 cbnz x0, 1f 89 mrs x0, vbar_el2 90 b 2f 91 921: 93 /* 94 * Perform the EL2 call 95 */ 96 kern_hyp_va x0 97 do_el2_call 98 992: eret 100 101el1_trap: 102 /* 103 * x1: ESR 104 * x2: ESR_EC 105 */ 106 107 /* Guest accessed VFP/SIMD registers, save host, restore Guest */ 108 cmp x2, #ESR_ELx_EC_FP_ASIMD 109 b.eq __fpsimd_guest_restore 110 111 mrs x0, tpidr_el2 112 mov x1, #ARM_EXCEPTION_TRAP 113 b __guest_exit 114 115el1_irq: 116 save_x0_to_x3 117 mrs x0, tpidr_el2 118 mov x1, #ARM_EXCEPTION_IRQ 119 b __guest_exit 120 121ENTRY(__hyp_do_panic) 122 mov lr, #(PSR_F_BIT | PSR_I_BIT | PSR_A_BIT | PSR_D_BIT |\ 123 PSR_MODE_EL1h) 124 msr spsr_el2, lr 125 ldr lr, =panic 126 msr elr_el2, lr 127 eret 128ENDPROC(__hyp_do_panic) 129 130.macro invalid_vector label, target = __hyp_panic 131 .align 2 132\label: 133 b \target 134ENDPROC(\label) 135.endm 136 137 /* None of these should ever happen */ 138 invalid_vector el2t_sync_invalid 139 invalid_vector el2t_irq_invalid 140 invalid_vector el2t_fiq_invalid 141 invalid_vector el2t_error_invalid 142 invalid_vector el2h_sync_invalid 143 invalid_vector el2h_irq_invalid 144 invalid_vector el2h_fiq_invalid 145 invalid_vector el2h_error_invalid 146 invalid_vector el1_sync_invalid 147 invalid_vector el1_irq_invalid 148 invalid_vector el1_fiq_invalid 149 invalid_vector el1_error_invalid 150 151 .ltorg 152 153 .align 11 154 155ENTRY(__kvm_hyp_vector) 156 ventry el2t_sync_invalid // Synchronous EL2t 157 ventry el2t_irq_invalid // IRQ EL2t 158 ventry el2t_fiq_invalid // FIQ EL2t 159 ventry el2t_error_invalid // Error EL2t 160 161 ventry el2h_sync_invalid // Synchronous EL2h 162 ventry el2h_irq_invalid // IRQ EL2h 163 ventry el2h_fiq_invalid // FIQ EL2h 164 ventry el2h_error_invalid // Error EL2h 165 166 ventry el1_sync // Synchronous 64-bit EL1 167 ventry el1_irq // IRQ 64-bit EL1 168 ventry el1_fiq_invalid // FIQ 64-bit EL1 169 ventry el1_error_invalid // Error 64-bit EL1 170 171 ventry el1_sync // Synchronous 32-bit EL1 172 ventry el1_irq // IRQ 32-bit EL1 173 ventry el1_fiq_invalid // FIQ 32-bit EL1 174 ventry el1_error_invalid // Error 32-bit EL1 175ENDPROC(__kvm_hyp_vector) 176