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