mirror of https://gitee.com/openkylin/linux.git
131 lines
3.0 KiB
C
131 lines
3.0 KiB
C
/*
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
|
* License. See the file "COPYING" in the main directory of this archive
|
|
* for more details.
|
|
*
|
|
* Copyright (C) 2009, Wind River Systems Inc
|
|
* Implemented by fredrik.markstrom@gmail.com and ivarholmqvist@gmail.com
|
|
*/
|
|
|
|
#include <linux/export.h>
|
|
#include <linux/uaccess.h>
|
|
|
|
asm(".global raw_copy_from_user\n"
|
|
" .type raw_copy_from_user, @function\n"
|
|
"raw_copy_from_user:\n"
|
|
" movi r2,7\n"
|
|
" mov r3,r4\n"
|
|
" bge r2,r6,1f\n"
|
|
" xor r2,r4,r5\n"
|
|
" andi r2,r2,3\n"
|
|
" movi r7,3\n"
|
|
" beq r2,zero,4f\n"
|
|
"1: addi r6,r6,-1\n"
|
|
" movi r2,-1\n"
|
|
" beq r6,r2,3f\n"
|
|
" mov r7,r2\n"
|
|
"2: ldbu r2,0(r5)\n"
|
|
" addi r6,r6,-1\n"
|
|
" addi r5,r5,1\n"
|
|
" stb r2,0(r3)\n"
|
|
" addi r3,r3,1\n"
|
|
" bne r6,r7,2b\n"
|
|
"3:\n"
|
|
" addi r2,r6,1\n"
|
|
" ret\n"
|
|
"13:mov r2,r6\n"
|
|
" ret\n"
|
|
"4: andi r2,r4,1\n"
|
|
" cmpeq r2,r2,zero\n"
|
|
" beq r2,zero,7f\n"
|
|
"5: andi r2,r3,2\n"
|
|
" beq r2,zero,6f\n"
|
|
"9: ldhu r2,0(r5)\n"
|
|
" addi r6,r6,-2\n"
|
|
" addi r5,r5,2\n"
|
|
" sth r2,0(r3)\n"
|
|
" addi r3,r3,2\n"
|
|
"6: bge r7,r6,1b\n"
|
|
"10:ldw r2,0(r5)\n"
|
|
" addi r6,r6,-4\n"
|
|
" addi r5,r5,4\n"
|
|
" stw r2,0(r3)\n"
|
|
" addi r3,r3,4\n"
|
|
" br 6b\n"
|
|
"7: ldbu r2,0(r5)\n"
|
|
" addi r6,r6,-1\n"
|
|
" addi r5,r5,1\n"
|
|
" addi r3,r4,1\n"
|
|
" stb r2,0(r4)\n"
|
|
" br 5b\n"
|
|
".section __ex_table,\"a\"\n"
|
|
".word 2b,3b\n"
|
|
".word 9b,13b\n"
|
|
".word 10b,13b\n"
|
|
".word 7b,13b\n"
|
|
".previous\n"
|
|
);
|
|
EXPORT_SYMBOL(raw_copy_from_user);
|
|
|
|
asm(
|
|
" .global raw_copy_to_user\n"
|
|
" .type raw_copy_to_user, @function\n"
|
|
"raw_copy_to_user:\n"
|
|
" movi r2,7\n"
|
|
" mov r3,r4\n"
|
|
" bge r2,r6,1f\n"
|
|
" xor r2,r4,r5\n"
|
|
" andi r2,r2,3\n"
|
|
" movi r7,3\n"
|
|
" beq r2,zero,4f\n"
|
|
/* Bail if we try to copy zero bytes */
|
|
"1: addi r6,r6,-1\n"
|
|
" movi r2,-1\n"
|
|
" beq r6,r2,3f\n"
|
|
/* Copy byte by byte for small copies and if src^dst != 0 */
|
|
" mov r7,r2\n"
|
|
"2: ldbu r2,0(r5)\n"
|
|
" addi r5,r5,1\n"
|
|
"9: stb r2,0(r3)\n"
|
|
" addi r6,r6,-1\n"
|
|
" addi r3,r3,1\n"
|
|
" bne r6,r7,2b\n"
|
|
"3: addi r2,r6,1\n"
|
|
" ret\n"
|
|
"13:mov r2,r6\n"
|
|
" ret\n"
|
|
/* If 'to' is an odd address byte copy */
|
|
"4: andi r2,r4,1\n"
|
|
" cmpeq r2,r2,zero\n"
|
|
" beq r2,zero,7f\n"
|
|
/* If 'to' is not divideable by four copy halfwords */
|
|
"5: andi r2,r3,2\n"
|
|
" beq r2,zero,6f\n"
|
|
" ldhu r2,0(r5)\n"
|
|
" addi r5,r5,2\n"
|
|
"10:sth r2,0(r3)\n"
|
|
" addi r6,r6,-2\n"
|
|
" addi r3,r3,2\n"
|
|
/* Copy words */
|
|
"6: bge r7,r6,1b\n"
|
|
" ldw r2,0(r5)\n"
|
|
" addi r5,r5,4\n"
|
|
"11:stw r2,0(r3)\n"
|
|
" addi r6,r6,-4\n"
|
|
" addi r3,r3,4\n"
|
|
" br 6b\n"
|
|
/* Copy remaining bytes */
|
|
"7: ldbu r2,0(r5)\n"
|
|
" addi r5,r5,1\n"
|
|
" addi r3,r4,1\n"
|
|
"12: stb r2,0(r4)\n"
|
|
" addi r6,r6,-1\n"
|
|
" br 5b\n"
|
|
".section __ex_table,\"a\"\n"
|
|
".word 9b,3b\n"
|
|
".word 10b,13b\n"
|
|
".word 11b,13b\n"
|
|
".word 12b,13b\n"
|
|
".previous\n");
|
|
EXPORT_SYMBOL(raw_copy_to_user);
|