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
vmm_emulate_instruction(struct vcpu * vcpu,uint64_t gpa,struct vie * vie,struct vm_guest_paging * paging __unused,mem_region_read_t memread,mem_region_write_t memwrite,void * memarg)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
vmm_emulate_register(struct vcpu * vcpu,struct vre * vre,reg_read_t regread,reg_write_t regwrite,void * regarg)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