1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2015 Mihai Carabas <mihai.carabas@gmail.com> 5 * Copyright (c) 2024 Ruslan Bukin <br@bsdpad.com> 6 * 7 * This software was developed by the University of Cambridge Computer 8 * Laboratory (Department of Computer Science and Technology) under Innovate 9 * UK project 105694, "Digital Security by Design (DSbD) Technology Platform 10 * Prototype". 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 21 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #ifdef _KERNEL 35 #include <sys/param.h> 36 #include <sys/pcpu.h> 37 #include <sys/systm.h> 38 #include <sys/proc.h> 39 40 #include <vm/vm.h> 41 42 #include <machine/machdep.h> 43 #include <machine/vmm.h> 44 #else 45 #include <sys/types.h> 46 #include <sys/errno.h> 47 #include <sys/_iovec.h> 48 49 #include <machine/vmm.h> 50 51 #include <assert.h> 52 #include <stdio.h> 53 #include <stdlib.h> 54 #include <vmmapi.h> 55 #endif 56 57 #include <machine/vmm_instruction_emul.h> 58 59 int 60 vmm_emulate_instruction(struct vcpu *vcpu, uint64_t gpa, struct vie *vie, 61 struct vm_guest_paging *paging __unused, mem_region_read_t memread, 62 mem_region_write_t memwrite, void *memarg) 63 { 64 uint64_t val; 65 int error; 66 67 if (vie->dir == VM_DIR_READ) { 68 error = memread(vcpu, gpa, &val, vie->access_size, memarg); 69 if (error) 70 goto out; 71 if ((vie->sign_extend == 0) && (vie->access_size < 8)) 72 val &= (1ul << (vie->access_size * 8)) - 1; 73 error = vm_set_register(vcpu, vie->reg, val); 74 } else { 75 error = vm_get_register(vcpu, vie->reg, &val); 76 if (error) 77 goto out; 78 /* Mask any unneeded bits from the register */ 79 if (vie->access_size < 8) 80 val &= (1ul << (vie->access_size * 8)) - 1; 81 error = memwrite(vcpu, gpa, val, vie->access_size, memarg); 82 } 83 84 out: 85 return (error); 86 } 87 88 int 89 vmm_emulate_register(struct vcpu *vcpu, struct vre *vre, reg_read_t regread, 90 reg_write_t regwrite, void *regarg) 91 { 92 uint64_t val; 93 int error; 94 95 if (vre->dir == VM_DIR_READ) { 96 error = regread(vcpu, &val, regarg); 97 if (error) 98 goto out; 99 error = vm_set_register(vcpu, vre->reg, val); 100 } else { 101 error = vm_get_register(vcpu, vre->reg, &val); 102 if (error) 103 goto out; 104 error = regwrite(vcpu, val, regarg); 105 } 106 107 out: 108 return (error); 109 } 110