The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/riscv/riscv/copyinout.S

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    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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