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/arch/arm26/lib/getuser.S

https://bitbucket.org/evzijst/gittest
Assembly | 112 lines | 106 code | 6 blank | 0 comment | 1 complexity | 9928082e95db32896951967ad5c5d9bf MD5 | raw file
  1/*
  2 *  linux/arch/arm26/lib/getuser.S
  3 *
  4 *  Copyright (C) 2001 Russell King
  5 *
  6 * This program is free software; you can redistribute it and/or modify
  7 * it under the terms of the GNU General Public License version 2 as
  8 * published by the Free Software Foundation.
  9 *
 10 *  Idea from x86 version, (C) Copyright 1998 Linus Torvalds
 11 *
 12 * These functions have a non-standard call interface to make them more
 13 * efficient, especially as they return an error value in addition to
 14 * the "real" return value.
 15 *
 16 * __get_user_X
 17 *
 18 * Inputs:	r0 contains the address
 19 * Outputs:	r0 is the error code
 20 *		r1, r2 contains the zero-extended value
 21 *		lr corrupted
 22 *
 23 * No other registers must be altered.  (see include/asm-arm/uaccess.h
 24 * for specific ASM register usage).
 25 *
 26 * Note that ADDR_LIMIT is either 0 or 0xc0000000.
 27 * Note also that it is intended that __get_user_bad is not global.
 28 */
 29#include <asm/asm_offsets.h>
 30#include <asm/thread_info.h>
 31#include <asm/errno.h>
 32
 33        .global __get_user_1
 34__get_user_1:
 35        bic     r1, sp, #0x1f00
 36        bic     r1, r1, #0x00ff
 37        str     lr, [sp, #-4]!
 38        ldr     r1, [r1, #TI_ADDR_LIMIT]
 39        sub     r1, r1, #1
 40        cmp     r0, r1
 41        bge     __get_user_bad
 42        cmp     r0, #0x02000000
 431:      ldrlsbt r1, [r0]
 44        ldrgeb  r1, [r0]
 45        mov     r0, #0
 46        ldmfd   sp!, {pc}^
 47
 48        .global __get_user_2
 49__get_user_2:
 50        bic     r2, sp, #0x1f00
 51        bic     r2, r2, #0x00ff
 52        str     lr, [sp, #-4]!
 53        ldr     r2, [r2, #TI_ADDR_LIMIT]
 54        sub     r2, r2, #2
 55        cmp     r0, r2
 56        bge     __get_user_bad
 57        cmp     r0, #0x02000000
 582:      ldrlsbt r1, [r0], #1
 593:      ldrlsbt r2, [r0]
 60        ldrgeb  r1, [r0], #1
 61        ldrgeb  r2, [r0]
 62        orr     r1, r1, r2, lsl #8
 63        mov     r0, #0
 64        ldmfd   sp!, {pc}^
 65
 66        .global __get_user_4
 67__get_user_4:
 68        bic     r1, sp, #0x1f00
 69        bic     r1, r1, #0x00ff
 70        str     lr, [sp, #-4]!
 71        ldr     r1, [r1, #TI_ADDR_LIMIT]
 72        sub     r1, r1, #4
 73        cmp     r0, r1
 74        bge     __get_user_bad
 75        cmp     r0, #0x02000000
 764:      ldrlst  r1, [r0]
 77        ldrge   r1, [r0]
 78        mov     r0, #0
 79        ldmfd   sp!, {pc}^
 80
 81        .global __get_user_8
 82__get_user_8:
 83        bic     r2, sp, #0x1f00
 84        bic     r2, r2, #0x00ff
 85        str     lr, [sp, #-4]!
 86        ldr     r2, [r2, #TI_ADDR_LIMIT]
 87        sub     r2, r2, #8
 88        cmp     r0, r2
 89        bge     __get_user_bad_8
 90        cmp     r0, #0x02000000
 915:      ldrlst  r1, [r0], #4
 926:      ldrlst  r2, [r0]
 93        ldrge   r1, [r0], #4
 94        ldrge   r2, [r0]
 95        mov     r0, #0
 96        ldmfd   sp!, {pc}^
 97
 98__get_user_bad_8:
 99        mov     r2, #0
100__get_user_bad:
101        mov     r1, #0
102        mov     r0, #-EFAULT
103        ldmfd   sp!, {pc}^
104
105.section __ex_table, "a"
106	.long	1b, __get_user_bad
107	.long	2b, __get_user_bad
108	.long	3b, __get_user_bad
109	.long	4b, __get_user_bad
110	.long	5b, __get_user_bad_8
111	.long	6b, __get_user_bad_8
112.previous