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sys/arm64/arm64/copyinout.S
- This file was added.
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svn:eol-style | null | native \ No newline at end of property |
svn:keywords | null | FreeBSD=%H \ No newline at end of property |
svn:mime-type | null | text/plain \ No newline at end of property |
/*- | |||||
* Copyright (c) 2015 The FreeBSD Foundation | |||||
* All rights reserved. | |||||
* | |||||
* This software was developed by Andrew Turner under | |||||
* sponsorship from the FreeBSD Foundation. | |||||
* | |||||
* Redistribution and use in source and binary forms, with or without | |||||
* modification, are permitted provided that the following conditions | |||||
* are met: | |||||
* 1. Redistributions of source code must retain the above copyright | |||||
* notice, this list of conditions and the following disclaimer. | |||||
* 2. Redistributions in binary form must reproduce the above copyright | |||||
* notice, this list of conditions and the following disclaimer in the | |||||
* documentation and/or other materials provided with the distribution. | |||||
* | |||||
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND | |||||
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |||||
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |||||
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE | |||||
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |||||
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |||||
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |||||
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |||||
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |||||
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |||||
* SUCH DAMAGE. | |||||
* | |||||
*/ | |||||
#include <machine/asm.h> | |||||
__FBSDID("$FreeBSD$"); | |||||
#include <sys/errno.h> | |||||
#include "assym.s" | |||||
/* | |||||
* Fault handler for the copy{in,out} functions below. | |||||
*/ | |||||
ENTRY(copyio_fault) | |||||
SET_FAULT_HANDLER(xzr, x1) /* Clear the handler */ | |||||
mov x0, #EFAULT | |||||
ret | |||||
END(copyio_fault) | |||||
/* | |||||
* Copies from a kernel to user address | |||||
* | |||||
* int copyout(const void *kaddr, void *udaddr, size_t len) | |||||
*/ | |||||
ENTRY(copyout) | |||||
cbz x2, 2f /* If len == 0 then skip loop */ | |||||
adr x6, copyio_fault /* Get the handler address */ | |||||
SET_FAULT_HANDLER(x6, x7) /* Set the handler */ | |||||
1: ldrb w4, [x0], #1 /* Load from kaddr */ | |||||
strb w4, [x1], #1 /* Store in uaddr */ | |||||
sub x2, x2, #1 /* len-- */ | |||||
cbnz x2, 1b | |||||
SET_FAULT_HANDLER(xzr, x7) /* Clear the handler */ | |||||
2: mov x0, xzr /* return 0 */ | |||||
ret | |||||
END(copyout) | |||||
/* | |||||
* Copies from a user to kernel address | |||||
* | |||||
* int copyin(const void *uaddr, void *kdaddr, size_t len) | |||||
*/ | |||||
ENTRY(copyin) | |||||
cbz x2, 2f /* If len == 0 then skip loop */ | |||||
adr x6, copyio_fault /* Get the handler address */ | |||||
SET_FAULT_HANDLER(x6, x7) /* Set the handler */ | |||||
1: ldrb w4, [x0], #1 /* Load from uaddr */ | |||||
strb w4, [x1], #1 /* Store in kaddr */ | |||||
sub x2, x2, #1 /* len-- */ | |||||
cbnz x2, 1b | |||||
SET_FAULT_HANDLER(xzr, x7) /* Clear the handler */ | |||||
2: mov x0, xzr /* return 0 */ | |||||
ret | |||||
END(copyin) | |||||
/* | |||||
* Copies a string from a user to kernel address | |||||
* | |||||
* int copyinstr(const void *udaddr, void *kaddr, size_t len, size_t *done) | |||||
*/ | |||||
ENTRY(copyinstr) | |||||
mov x5, xzr /* count = 0 */ | |||||
cbz x2, 3f /* If len == 0 then skip loop */ | |||||
adr x6, copyio_fault /* Get the handler address */ | |||||
SET_FAULT_HANDLER(x6, x7) /* Set the handler */ | |||||
1: ldrb w4, [x0], #1 /* Load from uaddr */ | |||||
strb w4, [x1], #1 /* Store in kaddr */ | |||||
cbz w4, 2f /* If == 0 then break */ | |||||
sub x2, x2, #1 /* len-- */ | |||||
add x5, x5, #1 /* count++ */ | |||||
cbnz x2, 1b | |||||
2: SET_FAULT_HANDLER(xzr, x7) /* Clear the handler */ | |||||
3: cbz x3, 4f /* Check if done != NULL */ | |||||
add x5, x5, #1 /* count++ */ | |||||
str x5, [x3] /* done = count */ | |||||
4: mov x0, xzr /* return 0 */ | |||||
ret | |||||
END(copyinstr) |