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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [arch/] [arm/] [lib/] [uaccess-armo.S] - Blame information for rev 1765

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/*
 *  linux/arch/arm/lib/uaccess-armo.S
 *
 *  Copyright (C) 1998 Russell King
 *
 *  Note!  Some code fragments found in here have a special calling
 *  convention - they are not APCS compliant!
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#include 
#include 
 
                .text
 
                .globl  SYMBOL_NAME(uaccess_user)
SYMBOL_NAME(uaccess_user):
                .word   uaccess_user_put_byte
                .word   uaccess_user_get_byte
                .word   uaccess_user_put_half
                .word   uaccess_user_get_half
                .word   uaccess_user_put_word
                .word   uaccess_user_get_word
                .word   __arch_copy_from_user
                .word   __arch_copy_to_user
                .word   __arch_clear_user
                .word   __arch_strncpy_from_user
                .word   __arch_strnlen_user
 
 
@ In : r0 = x, r1 = addr, r2 = error
@ Out: r2 = error
uaccess_user_put_byte:
                stmfd   sp!, {lr}
USER(           strbt   r0, [r1])
                ldmfd   sp!, {pc}^
 
@ In : r0 = x, r1 = addr, r2 = error
@ Out: r2 = error
uaccess_user_put_half:
                stmfd   sp!, {lr}
USER(           strbt   r0, [r1], #1)
                mov     r0, r0, lsr #8
USER(           strbt   r0, [r1])
                ldmfd   sp!, {pc}^
 
@ In : r0 = x, r1 = addr, r2 = error
@ Out: r2 = error
uaccess_user_put_word:
                stmfd   sp!, {lr}
USER(           strt    r0, [r1])
                ldmfd   sp!, {pc}^
 
9001:           mov     r2, #-EFAULT
                ldmfd   sp!, {pc}^
 
@ In : r0 = addr, r1 = error
@ Out: r0 = x, r1 = error
uaccess_user_get_byte:
                stmfd   sp!, {lr}
USER(           ldrbt   r0, [r0])
                ldmfd   sp!, {pc}^
 
@ In : r0 = addr, r1 = error
@ Out: r0 = x, r1 = error
uaccess_user_get_half:
                stmfd   sp!, {lr}
USER(           ldrt    r0, [r0])
                mov     r0, r0, lsl #16
                mov     r0, r0, lsr #16
                ldmfd   sp!, {pc}^
 
@ In : r0 = addr, r1 = error
@ Out: r0 = x, r1 = error
uaccess_user_get_word:
                stmfd   sp!, {lr}
USER(           ldrt    r0, [r0])
                ldmfd   sp!, {pc}^
 
9001:           mov     r1, #-EFAULT
                ldmfd   sp!, {pc}^
 
 
 
                .globl  SYMBOL_NAME(uaccess_kernel)
SYMBOL_NAME(uaccess_kernel):
                .word   uaccess_kernel_put_byte
                .word   uaccess_kernel_get_byte
                .word   uaccess_kernel_put_half
                .word   uaccess_kernel_get_half
                .word   uaccess_kernel_put_word
                .word   uaccess_kernel_get_word
                .word   uaccess_kernel_copy
                .word   uaccess_kernel_copy
                .word   uaccess_kernel_clear
                .word   uaccess_kernel_strncpy_from
                .word   uaccess_kernel_strnlen
 
@ In : r0 = x, r1 = addr, r2 = error
@ Out: r2 = error
uaccess_kernel_put_byte:
                stmfd   sp!, {lr}
                strb    r0, [r1]
                ldmfd   sp!, {pc}^
 
@ In : r0 = x, r1 = addr, r2 = error
@ Out: r2 = error
uaccess_kernel_put_half:
                stmfd   sp!, {lr}
                strb    r0, [r1]
                mov     r0, r0, lsr #8
                strb    r0, [r1, #1]
                ldmfd   sp!, {pc}^
 
@ In : r0 = x, r1 = addr, r2 = error
@ Out: r2 = error
uaccess_kernel_put_word:
                stmfd   sp!, {lr}
                str     r0, [r1]
                ldmfd   sp!, {pc}^
 
@ In : r0 = addr, r1 = error
@ Out: r0 = x, r1 = error
uaccess_kernel_get_byte:
                stmfd   sp!, {lr}
                ldrb    r0, [r0]
                ldmfd   sp!, {pc}^
 
@ In : r0 = addr, r1 = error
@ Out: r0 = x, r1 = error
uaccess_kernel_get_half:
                stmfd   sp!, {lr}
                ldr     r0, [r0]
                mov     r0, r0, lsl #16
                mov     r0, r0, lsr #16
                ldmfd   sp!, {pc}^
 
@ In : r0 = addr, r1 = error
@ Out: r0 = x, r1 = error
uaccess_kernel_get_word:
                stmfd   sp!, {lr}
                ldr     r0, [r0]
                ldmfd   sp!, {pc}^
 
 
/* Prototype: int uaccess_kernel_copy(void *to, const char *from, size_t n)
 * Purpose  : copy a block to kernel memory from kernel memory
 * Params   : to   - kernel memory
 *          : from - kernel memory
 *          : n    - number of bytes to copy
 * Returns  : Number of bytes NOT copied.
 */
uaccess_kernel_copy:
                stmfd   sp!, {lr}
                bl      SYMBOL_NAME(memcpy)
                mov     r0, #0
                ldmfd   sp!, {pc}^
 
/* Prototype: int uaccess_kernel_clear(void *addr, size_t sz)
 * Purpose  : clear some kernel memory
 * Params   : addr - kernel memory address to clear
 *          : sz   - number of bytes to clear
 * Returns  : number of bytes NOT cleared
 */
uaccess_kernel_clear:
                stmfd   sp!, {lr}
                mov     r2, #0
                cmp     r1, #4
                blt     2f
                ands    ip, r0, #3
                beq     1f
                cmp     ip, #1
                strb    r2, [r0], #1
                strleb  r2, [r0], #1
                strltb  r2, [r0], #1
                rsb     ip, ip, #4
                sub     r1, r1, ip              @  7  6  5  4  3  2  1
1:              subs    r1, r1, #8              @ -1 -2 -3 -4 -5 -6 -7
                bmi     2f
                str     r2, [r0], #4
                str     r2, [r0], #4
                b       1b
2:              adds    r1, r1, #4              @  3  2  1  0 -1 -2 -3
                strpl   r2, [r0], #4
                tst     r1, #2                  @ 1x 1x 0x 0x 1x 1x 0x
                strneb  r2, [r0], #1
                strneb  r2, [r0], #1
                tst     r1, #1                  @ x1 x0 x1 x0 x1 x0 x1
                strneb  r2, [r0], #1
                mov     r0, #0
                ldmfd   sp!, {pc}^
 
/* Prototype: size_t uaccess_kernel_strncpy_from(char *dst, char *src, size_t len)
 * Purpose  : copy a string from kernel memory to kernel memory
 * Params   : dst - kernel memory destination
 *          : src - kernel memory source
 *          : len - maximum length of string
 * Returns  : number of characters copied
 */
uaccess_kernel_strncpy_from:
                stmfd   sp!, {lr}
                mov     ip, r2
1:              subs    r2, r2, #1
                bmi     2f
                ldrb    r3, [r1], #1
                strb    r3, [r0], #1
                teq     r3, #0
                bne     1b
2:              subs    r0, ip, r2
                ldmfd   sp!, {pc}^
 
/* Prototype: int uaccess_kernel_strlen(char *str, long n)
 * Purpose  : get length of a string in kernel memory
 * Params   : str - address of string in kernel memory
 * Returns  : length of string *including terminator*,
 *            or zero on exception, or n + 1 if too long
 */
uaccess_kernel_strnlen:
                stmfd   sp!, {lr}
                mov     r2, r0
1:              ldrb    r1, [r0], #1
                teq     r1, #0
                beq     2f
                subs    r1, r1, #1
                bne     1b
                add     r0, r0, #1
2:              sub     r0, r0, r2
                ldmfd   sp!, {pc}^
 

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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [arch/] [arm/] [lib/] [uaccess-armo.S] - Blame information for rev 1765

Line No.	Rev	Author	Line
1	1275	phoenix	`/*`
2			`* linux/arch/arm/lib/uaccess-armo.S`
3			`*`
4			`* Copyright (C) 1998 Russell King`
5			`*`
6			`* Note! Some code fragments found in here have a special calling`
7			`* convention - they are not APCS compliant!`
8			`*`
9			`* This program is free software; you can redistribute it and/or modify`
10			`* it under the terms of the GNU General Public License version 2 as`
11			`* published by the Free Software Foundation.`
12			`*/`
13			`#include`
14			`#include`
15
16			`.text`
17
18			`.globl SYMBOL_NAME(uaccess_user)`
19			`SYMBOL_NAME(uaccess_user):`
20			`.word uaccess_user_put_byte`
21			`.word uaccess_user_get_byte`
22			`.word uaccess_user_put_half`
23			`.word uaccess_user_get_half`
24			`.word uaccess_user_put_word`
25			`.word uaccess_user_get_word`
26			`.word __arch_copy_from_user`
27			`.word __arch_copy_to_user`
28			`.word __arch_clear_user`
29			`.word __arch_strncpy_from_user`
30			`.word __arch_strnlen_user`
31
32
33			`@ In : r0 = x, r1 = addr, r2 = error`
34			`@ Out: r2 = error`
35			`uaccess_user_put_byte:`
36			`stmfd sp!, {lr}`
37			`USER( strbt r0, [r1])`
38			`ldmfd sp!, {pc}^`
39
40			`@ In : r0 = x, r1 = addr, r2 = error`
41			`@ Out: r2 = error`
42			`uaccess_user_put_half:`
43			`stmfd sp!, {lr}`
44			`USER( strbt r0, [r1], #1)`
45			`mov r0, r0, lsr #8`
46			`USER( strbt r0, [r1])`
47			`ldmfd sp!, {pc}^`
48
49			`@ In : r0 = x, r1 = addr, r2 = error`
50			`@ Out: r2 = error`
51			`uaccess_user_put_word:`
52			`stmfd sp!, {lr}`
53			`USER( strt r0, [r1])`
54			`ldmfd sp!, {pc}^`
55
56			`9001: mov r2, #-EFAULT`
57			`ldmfd sp!, {pc}^`
58
59			`@ In : r0 = addr, r1 = error`
60			`@ Out: r0 = x, r1 = error`
61			`uaccess_user_get_byte:`
62			`stmfd sp!, {lr}`
63			`USER( ldrbt r0, [r0])`
64			`ldmfd sp!, {pc}^`
65
66			`@ In : r0 = addr, r1 = error`
67			`@ Out: r0 = x, r1 = error`
68			`uaccess_user_get_half:`
69			`stmfd sp!, {lr}`
70			`USER( ldrt r0, [r0])`
71			`mov r0, r0, lsl #16`
72			`mov r0, r0, lsr #16`
73			`ldmfd sp!, {pc}^`
74
75			`@ In : r0 = addr, r1 = error`
76			`@ Out: r0 = x, r1 = error`
77			`uaccess_user_get_word:`
78			`stmfd sp!, {lr}`
79			`USER( ldrt r0, [r0])`
80			`ldmfd sp!, {pc}^`
81
82			`9001: mov r1, #-EFAULT`
83			`ldmfd sp!, {pc}^`
84
85
86
87			`.globl SYMBOL_NAME(uaccess_kernel)`
88			`SYMBOL_NAME(uaccess_kernel):`
89			`.word uaccess_kernel_put_byte`
90			`.word uaccess_kernel_get_byte`
91			`.word uaccess_kernel_put_half`
92			`.word uaccess_kernel_get_half`
93			`.word uaccess_kernel_put_word`
94			`.word uaccess_kernel_get_word`
95			`.word uaccess_kernel_copy`
96			`.word uaccess_kernel_copy`
97			`.word uaccess_kernel_clear`
98			`.word uaccess_kernel_strncpy_from`
99			`.word uaccess_kernel_strnlen`
100
101			`@ In : r0 = x, r1 = addr, r2 = error`
102			`@ Out: r2 = error`
103			`uaccess_kernel_put_byte:`
104			`stmfd sp!, {lr}`
105			`strb r0, [r1]`
106			`ldmfd sp!, {pc}^`
107
108			`@ In : r0 = x, r1 = addr, r2 = error`
109			`@ Out: r2 = error`
110			`uaccess_kernel_put_half:`
111			`stmfd sp!, {lr}`
112			`strb r0, [r1]`
113			`mov r0, r0, lsr #8`
114			`strb r0, [r1, #1]`
115			`ldmfd sp!, {pc}^`
116
117			`@ In : r0 = x, r1 = addr, r2 = error`
118			`@ Out: r2 = error`
119			`uaccess_kernel_put_word:`
120			`stmfd sp!, {lr}`
121			`str r0, [r1]`
122			`ldmfd sp!, {pc}^`
123
124			`@ In : r0 = addr, r1 = error`
125			`@ Out: r0 = x, r1 = error`
126			`uaccess_kernel_get_byte:`
127			`stmfd sp!, {lr}`
128			`ldrb r0, [r0]`
129			`ldmfd sp!, {pc}^`
130
131			`@ In : r0 = addr, r1 = error`
132			`@ Out: r0 = x, r1 = error`
133			`uaccess_kernel_get_half:`
134			`stmfd sp!, {lr}`
135			`ldr r0, [r0]`
136			`mov r0, r0, lsl #16`
137			`mov r0, r0, lsr #16`
138			`ldmfd sp!, {pc}^`
139
140			`@ In : r0 = addr, r1 = error`
141			`@ Out: r0 = x, r1 = error`
142			`uaccess_kernel_get_word:`
143			`stmfd sp!, {lr}`
144			`ldr r0, [r0]`
145			`ldmfd sp!, {pc}^`
146
147
148			`/* Prototype: int uaccess_kernel_copy(void to, const char from, size_t n)`
149			`* Purpose : copy a block to kernel memory from kernel memory`
150			`* Params : to - kernel memory`
151			`* : from - kernel memory`
152			`* : n - number of bytes to copy`
153			`* Returns : Number of bytes NOT copied.`
154			`*/`
155			`uaccess_kernel_copy:`
156			`stmfd sp!, {lr}`
157			`bl SYMBOL_NAME(memcpy)`
158			`mov r0, #0`
159			`ldmfd sp!, {pc}^`
160
161			`/* Prototype: int uaccess_kernel_clear(void *addr, size_t sz)`
162			`* Purpose : clear some kernel memory`
163			`* Params : addr - kernel memory address to clear`
164			`* : sz - number of bytes to clear`
165			`* Returns : number of bytes NOT cleared`
166			`*/`
167			`uaccess_kernel_clear:`
168			`stmfd sp!, {lr}`
169			`mov r2, #0`
170			`cmp r1, #4`
171			`blt 2f`
172			`ands ip, r0, #3`
173			`beq 1f`
174			`cmp ip, #1`
175			`strb r2, [r0], #1`
176			`strleb r2, [r0], #1`
177			`strltb r2, [r0], #1`
178			`rsb ip, ip, #4`
179			`sub r1, r1, ip @ 7 6 5 4 3 2 1`
180			`1: subs r1, r1, #8 @ -1 -2 -3 -4 -5 -6 -7`
181			`bmi 2f`
182			`str r2, [r0], #4`
183			`str r2, [r0], #4`
184			`b 1b`
185			`2: adds r1, r1, #4 @ 3 2 1 0 -1 -2 -3`
186			`strpl r2, [r0], #4`
187			`tst r1, #2 @ 1x 1x 0x 0x 1x 1x 0x`
188			`strneb r2, [r0], #1`
189			`strneb r2, [r0], #1`
190			`tst r1, #1 @ x1 x0 x1 x0 x1 x0 x1`
191			`strneb r2, [r0], #1`
192			`mov r0, #0`
193			`ldmfd sp!, {pc}^`
194
195			`/* Prototype: size_t uaccess_kernel_strncpy_from(char dst, char src, size_t len)`
196			`* Purpose : copy a string from kernel memory to kernel memory`
197			`* Params : dst - kernel memory destination`
198			`* : src - kernel memory source`
199			`* : len - maximum length of string`
200			`* Returns : number of characters copied`
201			`*/`
202			`uaccess_kernel_strncpy_from:`
203			`stmfd sp!, {lr}`
204			`mov ip, r2`
205			`1: subs r2, r2, #1`
206			`bmi 2f`
207			`ldrb r3, [r1], #1`
208			`strb r3, [r0], #1`
209			`teq r3, #0`
210			`bne 1b`
211			`2: subs r0, ip, r2`
212			`ldmfd sp!, {pc}^`
213
214			`/* Prototype: int uaccess_kernel_strlen(char *str, long n)`
215			`* Purpose : get length of a string in kernel memory`
216			`* Params : str - address of string in kernel memory`
217			`* Returns : length of string including terminator,`
218			`* or zero on exception, or n + 1 if too long`
219			`*/`
220			`uaccess_kernel_strnlen:`
221			`stmfd sp!, {lr}`
222			`mov r2, r0`
223			`1: ldrb r1, [r0], #1`
224			`teq r1, #0`
225			`beq 2f`
226			`subs r1, r1, #1`
227			`bne 1b`
228			`add r0, r0, #1`
229			`2: sub r0, r0, r2`
230			`ldmfd sp!, {pc}^`
231