2 * Copyright (c) 2015-2018 Ruslan Bukin <br@bsdpad.com>
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.
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).
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
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.
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
35 #include <machine/asm.h>
36 __FBSDID("$FreeBSD$");
38 #include <machine/riscvreg.h>
39 #include <sys/errno.h>
44 * Fault handler for the copy{in,out} functions below.
47 SET_FAULT_HANDLER(x0, a1) /* Clear the handler */
55 * copycommon - common copy routine
58 * a1 - Destination address
62 la a6, copyio_fault /* Get the handler address */
63 SET_FAULT_HANDLER(a6, a7) /* Set the handler */
66 1: lb a4, 0(a0) /* Load from src */
68 sb a4, 0(a1) /* Store in dest */
70 addi a2, a2, -1 /* len-- */
74 SET_FAULT_HANDLER(x0, a7) /* Clear the handler */
78 * Copies from a kernel to user address
80 * int copyout(const void *kaddr, void *udaddr, size_t len)
83 beqz a2, copyout_end /* If len == 0 then skip loop */
85 li a4, VM_MAXUSER_ADDRESS
86 bgt a3, a4, copyio_fault_nopcb
91 li a0, 0 /* return 0 */
96 * Copies from a user to kernel address
98 * int copyin(const void *uaddr, void *kaddr, size_t len)
101 beqz a2, copyin_end /* If len == 0 then skip loop */
103 li a4, VM_MAXUSER_ADDRESS
104 bgt a3, a4, copyio_fault_nopcb
109 li a0, 0 /* return 0 */
114 * Copies a string from a user to kernel address
116 * int copyinstr(const void *udaddr, void *kaddr, size_t len, size_t *done)
119 mv a5, x0 /* count = 0 */
120 beqz a2, 3f /* If len == 0 then skip loop */
122 la a6, copyio_fault /* Get the handler address */
123 SET_FAULT_HANDLER(a6, a7) /* Set the handler */
124 ENTER_USER_ACCESS(a7)
126 li a7, VM_MAXUSER_ADDRESS
127 1: bgt a0, a7, copyio_fault
128 lb a4, 0(a0) /* Load from uaddr */
130 sb a4, 0(a1) /* Store in kaddr */
133 addi a2, a2, -1 /* len-- */
134 addi a5, a5, 1 /* count++ */
137 2: EXIT_USER_ACCESS(a7)
138 SET_FAULT_HANDLER(x0, a7) /* Clear the handler */
140 3: beqz a3, 4f /* Check if done != NULL */
141 addi a5, a5, 1 /* count++ */
142 sd a5, 0(a3) /* done = count */
144 4: mv a0, x0 /* return 0 */