1 /*-
2 * Copyright (c) 2015-2018 Ruslan Bukin <br@bsdpad.com>
3 * All rights reserved.
4 *
5 * Portions of this software were developed by SRI International and the
6 * University of Cambridge Computer Laboratory under DARPA/AFRL contract
7 * FA8750-10-C-0237 ("CTSRD"), as part of the DARPA CRASH research programme.
8 *
9 * Portions of this software were developed by the University of Cambridge
10 * Computer Laboratory as part of the CTSRD Project, with support from the
11 * UK Higher Education Innovation Fund (HEIF).
12 *
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
15 * are met:
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35 #include <machine/asm.h>
36 __FBSDID("$FreeBSD: releng/12.0/sys/riscv/riscv/copyinout.S 338467 2018-09-05 11:34:58Z br $");
37
38 #include <machine/riscvreg.h>
39 #include <sys/errno.h>
40
41 #include "assym.inc"
42
43 /*
44 * Fault handler for the copy{in,out} functions below.
45 */
46 ENTRY(copyio_fault)
47 SET_FAULT_HANDLER(x0, a1) /* Clear the handler */
48 EXIT_USER_ACCESS(a1)
49 copyio_fault_nopcb:
50 li a0, EFAULT
51 ret
52 END(copyio_fault)
53
54 /*
55 * Copies from a kernel to user address
56 *
57 * int copyout(const void *kaddr, void *udaddr, size_t len)
58 */
59 ENTRY(copyout)
60 beqz a2, 2f /* If len == 0 then skip loop */
61 add a3, a1, a2
62 li a4, VM_MAXUSER_ADDRESS
63 bgt a3, a4, copyio_fault_nopcb
64
65 la a6, copyio_fault /* Get the handler address */
66 SET_FAULT_HANDLER(a6, a7) /* Set the handler */
67 ENTER_USER_ACCESS(a7)
68
69 1: lb a4, 0(a0) /* Load from kaddr */
70 addi a0, a0, 1
71 sb a4, 0(a1) /* Store in uaddr */
72 addi a1, a1, 1
73 addi a2, a2, -1 /* len-- */
74 bnez a2, 1b
75
76 EXIT_USER_ACCESS(a7)
77 SET_FAULT_HANDLER(x0, a7) /* Clear the handler */
78
79 2: li a0, 0 /* return 0 */
80 ret
81 END(copyout)
82
83 /*
84 * Copies from a user to kernel address
85 *
86 * int copyin(const void *uaddr, void *kdaddr, size_t len)
87 */
88 ENTRY(copyin)
89 beqz a2, 2f /* If len == 0 then skip loop */
90 add a3, a0, a2
91 li a4, VM_MAXUSER_ADDRESS
92 bgt a3, a4, copyio_fault_nopcb
93
94 la a6, copyio_fault /* Get the handler address */
95 SET_FAULT_HANDLER(a6, a7) /* Set the handler */
96 ENTER_USER_ACCESS(a7)
97
98 1: lb a4, 0(a0) /* Load from uaddr */
99 addi a0, a0, 1
100 sb a4, 0(a1) /* Store in kaddr */
101 addi a1, a1, 1
102 addi a2, a2, -1 /* len-- */
103 bnez a2, 1b
104
105 EXIT_USER_ACCESS(a7)
106 SET_FAULT_HANDLER(x0, a7) /* Clear the handler */
107
108 2: li a0, 0 /* return 0 */
109 ret
110 END(copyin)
111
112 /*
113 * Copies a string from a user to kernel address
114 *
115 * int copyinstr(const void *udaddr, void *kaddr, size_t len, size_t *done)
116 */
117 ENTRY(copyinstr)
118 mv a5, x0 /* count = 0 */
119 beqz a2, 3f /* If len == 0 then skip loop */
120
121 la a6, copyio_fault /* Get the handler address */
122 SET_FAULT_HANDLER(a6, a7) /* Set the handler */
123 ENTER_USER_ACCESS(a7)
124
125 li a7, VM_MAXUSER_ADDRESS
126 1: bgt a0, a7, copyio_fault
127 lb a4, 0(a0) /* Load from uaddr */
128 addi a0, a0, 1
129 sb a4, 0(a1) /* Store in kaddr */
130 addi a1, a1, 1
131 beqz a4, 2f
132 addi a2, a2, -1 /* len-- */
133 addi a5, a5, 1 /* count++ */
134 bnez a2, 1b
135
136 2: EXIT_USER_ACCESS(a7)
137 SET_FAULT_HANDLER(x0, a7) /* Clear the handler */
138
139 3: beqz a3, 4f /* Check if done != NULL */
140 addi a5, a5, 1 /* count++ */
141 sd a5, 0(a3) /* done = count */
142
143 4: mv a0, x0 /* return 0 */
144 beqz a4, 5f
145 li a0, ENAMETOOLONG
146 5:
147 ret
148 END(copyinstr)
Cache object: 5977d73472c97f27372e39d510c39e79
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