| 1 |
1275 |
phoenix |
/*
|
| 2 |
|
|
* linux/arch/arm/lib/uaccess.S
|
| 3 |
|
|
*
|
| 4 |
|
|
* Copyright (C) 1995, 1996,1997,1998 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 |
|
|
* Routines to block copy data to/from user memory
|
| 11 |
|
|
* These are highly optimised both for the 4k page size
|
| 12 |
|
|
* and for various alignments.
|
| 13 |
|
|
*/
|
| 14 |
|
|
#include
|
| 15 |
|
|
#include
|
| 16 |
|
|
#include
|
| 17 |
|
|
|
| 18 |
|
|
.text
|
| 19 |
|
|
|
| 20 |
|
|
#define PAGE_SHIFT 12
|
| 21 |
|
|
|
| 22 |
|
|
/* Prototype: int __arch_copy_to_user(void *to, const char *from, size_t n)
|
| 23 |
|
|
* Purpose : copy a block to user memory from kernel memory
|
| 24 |
|
|
* Params : to - user memory
|
| 25 |
|
|
* : from - kernel memory
|
| 26 |
|
|
* : n - number of bytes to copy
|
| 27 |
|
|
* Returns : Number of bytes NOT copied.
|
| 28 |
|
|
*/
|
| 29 |
|
|
|
| 30 |
|
|
.c2u_dest_not_aligned:
|
| 31 |
|
|
rsb ip, ip, #4
|
| 32 |
|
|
cmp ip, #2
|
| 33 |
|
|
ldrb r3, [r1], #1
|
| 34 |
|
|
USER( strbt r3, [r0], #1) @ May fault
|
| 35 |
|
|
ldrgeb r3, [r1], #1
|
| 36 |
|
|
USER( strgebt r3, [r0], #1) @ May fault
|
| 37 |
|
|
ldrgtb r3, [r1], #1
|
| 38 |
|
|
USER( strgtbt r3, [r0], #1) @ May fault
|
| 39 |
|
|
sub r2, r2, ip
|
| 40 |
|
|
b .c2u_dest_aligned
|
| 41 |
|
|
|
| 42 |
|
|
ENTRY(__arch_copy_to_user)
|
| 43 |
|
|
stmfd sp!, {r2, r4 - r7, lr}
|
| 44 |
|
|
cmp r2, #4
|
| 45 |
|
|
blt .c2u_not_enough
|
| 46 |
|
|
ands ip, r0, #3
|
| 47 |
|
|
bne .c2u_dest_not_aligned
|
| 48 |
|
|
.c2u_dest_aligned:
|
| 49 |
|
|
|
| 50 |
|
|
ands ip, r1, #3
|
| 51 |
|
|
bne .c2u_src_not_aligned
|
| 52 |
|
|
/*
|
| 53 |
|
|
* Seeing as there has to be at least 8 bytes to copy, we can
|
| 54 |
|
|
* copy one word, and force a user-mode page fault...
|
| 55 |
|
|
*/
|
| 56 |
|
|
|
| 57 |
|
|
.c2u_0fupi: subs r2, r2, #4
|
| 58 |
|
|
addmi ip, r2, #4
|
| 59 |
|
|
bmi .c2u_0nowords
|
| 60 |
|
|
ldr r3, [r1], #4
|
| 61 |
|
|
USER( strt r3, [r0], #4) @ May fault
|
| 62 |
|
|
mov ip, r0, lsl #32 - PAGE_SHIFT @ On each page, use a ld/st??t instruction
|
| 63 |
|
|
rsb ip, ip, #0
|
| 64 |
|
|
movs ip, ip, lsr #32 - PAGE_SHIFT
|
| 65 |
|
|
beq .c2u_0fupi
|
| 66 |
|
|
/*
|
| 67 |
|
|
* ip = max no. of bytes to copy before needing another "strt" insn
|
| 68 |
|
|
*/
|
| 69 |
|
|
cmp r2, ip
|
| 70 |
|
|
movlt ip, r2
|
| 71 |
|
|
sub r2, r2, ip
|
| 72 |
|
|
subs ip, ip, #32
|
| 73 |
|
|
blt .c2u_0rem8lp
|
| 74 |
|
|
|
| 75 |
|
|
.c2u_0cpy8lp: ldmia r1!, {r3 - r6}
|
| 76 |
|
|
stmia r0!, {r3 - r6} @ Shouldnt fault
|
| 77 |
|
|
ldmia r1!, {r3 - r6}
|
| 78 |
|
|
stmia r0!, {r3 - r6} @ Shouldnt fault
|
| 79 |
|
|
subs ip, ip, #32
|
| 80 |
|
|
bpl .c2u_0cpy8lp
|
| 81 |
|
|
.c2u_0rem8lp: cmn ip, #16
|
| 82 |
|
|
ldmgeia r1!, {r3 - r6}
|
| 83 |
|
|
stmgeia r0!, {r3 - r6} @ Shouldnt fault
|
| 84 |
|
|
tst ip, #8
|
| 85 |
|
|
ldmneia r1!, {r3 - r4}
|
| 86 |
|
|
stmneia r0!, {r3 - r4} @ Shouldnt fault
|
| 87 |
|
|
tst ip, #4
|
| 88 |
|
|
ldrne r3, [r1], #4
|
| 89 |
|
|
strnet r3, [r0], #4 @ Shouldnt fault
|
| 90 |
|
|
ands ip, ip, #3
|
| 91 |
|
|
beq .c2u_0fupi
|
| 92 |
|
|
.c2u_0nowords: teq ip, #0
|
| 93 |
|
|
beq .c2u_finished
|
| 94 |
|
|
.c2u_nowords: cmp ip, #2
|
| 95 |
|
|
ldrb r3, [r1], #1
|
| 96 |
|
|
USER( strbt r3, [r0], #1) @ May fault
|
| 97 |
|
|
ldrgeb r3, [r1], #1
|
| 98 |
|
|
USER( strgebt r3, [r0], #1) @ May fault
|
| 99 |
|
|
ldrgtb r3, [r1], #1
|
| 100 |
|
|
USER( strgtbt r3, [r0], #1) @ May fault
|
| 101 |
|
|
b .c2u_finished
|
| 102 |
|
|
|
| 103 |
|
|
.c2u_not_enough:
|
| 104 |
|
|
movs ip, r2
|
| 105 |
|
|
bne .c2u_nowords
|
| 106 |
|
|
.c2u_finished: mov r0, #0
|
| 107 |
|
|
LOADREGS(fd,sp!,{r2, r4 - r7, pc})
|
| 108 |
|
|
|
| 109 |
|
|
.c2u_src_not_aligned:
|
| 110 |
|
|
bic r1, r1, #3
|
| 111 |
|
|
ldr r7, [r1], #4
|
| 112 |
|
|
cmp ip, #2
|
| 113 |
|
|
bgt .c2u_3fupi
|
| 114 |
|
|
beq .c2u_2fupi
|
| 115 |
|
|
.c2u_1fupi: subs r2, r2, #4
|
| 116 |
|
|
addmi ip, r2, #4
|
| 117 |
|
|
bmi .c2u_1nowords
|
| 118 |
|
|
mov r3, r7, lsr #8
|
| 119 |
|
|
ldr r7, [r1], #4
|
| 120 |
|
|
orr r3, r3, r7, lsl #24
|
| 121 |
|
|
USER( strt r3, [r0], #4) @ May fault
|
| 122 |
|
|
mov ip, r0, lsl #32 - PAGE_SHIFT
|
| 123 |
|
|
rsb ip, ip, #0
|
| 124 |
|
|
movs ip, ip, lsr #32 - PAGE_SHIFT
|
| 125 |
|
|
beq .c2u_1fupi
|
| 126 |
|
|
cmp r2, ip
|
| 127 |
|
|
movlt ip, r2
|
| 128 |
|
|
sub r2, r2, ip
|
| 129 |
|
|
subs ip, ip, #16
|
| 130 |
|
|
blt .c2u_1rem8lp
|
| 131 |
|
|
|
| 132 |
|
|
.c2u_1cpy8lp: mov r3, r7, lsr #8
|
| 133 |
|
|
ldmia r1!, {r4 - r7}
|
| 134 |
|
|
orr r3, r3, r4, lsl #24
|
| 135 |
|
|
mov r4, r4, lsr #8
|
| 136 |
|
|
orr r4, r4, r5, lsl #24
|
| 137 |
|
|
mov r5, r5, lsr #8
|
| 138 |
|
|
orr r5, r5, r6, lsl #24
|
| 139 |
|
|
mov r6, r6, lsr #8
|
| 140 |
|
|
orr r6, r6, r7, lsl #24
|
| 141 |
|
|
stmia r0!, {r3 - r6} @ Shouldnt fault
|
| 142 |
|
|
subs ip, ip, #16
|
| 143 |
|
|
bpl .c2u_1cpy8lp
|
| 144 |
|
|
.c2u_1rem8lp: tst ip, #8
|
| 145 |
|
|
movne r3, r7, lsr #8
|
| 146 |
|
|
ldmneia r1!, {r4, r7}
|
| 147 |
|
|
orrne r3, r3, r4, lsl #24
|
| 148 |
|
|
movne r4, r4, lsr #8
|
| 149 |
|
|
orrne r4, r4, r7, lsl #24
|
| 150 |
|
|
stmneia r0!, {r3 - r4} @ Shouldnt fault
|
| 151 |
|
|
tst ip, #4
|
| 152 |
|
|
movne r3, r7, lsr #8
|
| 153 |
|
|
ldrne r7, [r1], #4
|
| 154 |
|
|
orrne r3, r3, r7, lsl #24
|
| 155 |
|
|
strnet r3, [r0], #4 @ Shouldnt fault
|
| 156 |
|
|
ands ip, ip, #3
|
| 157 |
|
|
beq .c2u_1fupi
|
| 158 |
|
|
.c2u_1nowords: mov r3, r7, lsr #8
|
| 159 |
|
|
teq ip, #0
|
| 160 |
|
|
beq .c2u_finished
|
| 161 |
|
|
cmp ip, #2
|
| 162 |
|
|
USER( strbt r3, [r0], #1) @ May fault
|
| 163 |
|
|
movge r3, r3, lsr #8
|
| 164 |
|
|
USER( strgebt r3, [r0], #1) @ May fault
|
| 165 |
|
|
movgt r3, r3, lsr #8
|
| 166 |
|
|
USER( strgtbt r3, [r0], #1) @ May fault
|
| 167 |
|
|
b .c2u_finished
|
| 168 |
|
|
|
| 169 |
|
|
.c2u_2fupi: subs r2, r2, #4
|
| 170 |
|
|
addmi ip, r2, #4
|
| 171 |
|
|
bmi .c2u_2nowords
|
| 172 |
|
|
mov r3, r7, lsr #16
|
| 173 |
|
|
ldr r7, [r1], #4
|
| 174 |
|
|
orr r3, r3, r7, lsl #16
|
| 175 |
|
|
USER( strt r3, [r0], #4) @ May fault
|
| 176 |
|
|
mov ip, r0, lsl #32 - PAGE_SHIFT
|
| 177 |
|
|
rsb ip, ip, #0
|
| 178 |
|
|
movs ip, ip, lsr #32 - PAGE_SHIFT
|
| 179 |
|
|
beq .c2u_2fupi
|
| 180 |
|
|
cmp r2, ip
|
| 181 |
|
|
movlt ip, r2
|
| 182 |
|
|
sub r2, r2, ip
|
| 183 |
|
|
subs ip, ip, #16
|
| 184 |
|
|
blt .c2u_2rem8lp
|
| 185 |
|
|
|
| 186 |
|
|
.c2u_2cpy8lp: mov r3, r7, lsr #16
|
| 187 |
|
|
ldmia r1!, {r4 - r7}
|
| 188 |
|
|
orr r3, r3, r4, lsl #16
|
| 189 |
|
|
mov r4, r4, lsr #16
|
| 190 |
|
|
orr r4, r4, r5, lsl #16
|
| 191 |
|
|
mov r5, r5, lsr #16
|
| 192 |
|
|
orr r5, r5, r6, lsl #16
|
| 193 |
|
|
mov r6, r6, lsr #16
|
| 194 |
|
|
orr r6, r6, r7, lsl #16
|
| 195 |
|
|
stmia r0!, {r3 - r6} @ Shouldnt fault
|
| 196 |
|
|
subs ip, ip, #16
|
| 197 |
|
|
bpl .c2u_2cpy8lp
|
| 198 |
|
|
.c2u_2rem8lp: tst ip, #8
|
| 199 |
|
|
movne r3, r7, lsr #16
|
| 200 |
|
|
ldmneia r1!, {r4, r7}
|
| 201 |
|
|
orrne r3, r3, r4, lsl #16
|
| 202 |
|
|
movne r4, r4, lsr #16
|
| 203 |
|
|
orrne r4, r4, r7, lsl #16
|
| 204 |
|
|
stmneia r0!, {r3 - r4} @ Shouldnt fault
|
| 205 |
|
|
tst ip, #4
|
| 206 |
|
|
movne r3, r7, lsr #16
|
| 207 |
|
|
ldrne r7, [r1], #4
|
| 208 |
|
|
orrne r3, r3, r7, lsl #16
|
| 209 |
|
|
strnet r3, [r0], #4 @ Shouldnt fault
|
| 210 |
|
|
ands ip, ip, #3
|
| 211 |
|
|
beq .c2u_2fupi
|
| 212 |
|
|
.c2u_2nowords: mov r3, r7, lsr #16
|
| 213 |
|
|
teq ip, #0
|
| 214 |
|
|
beq .c2u_finished
|
| 215 |
|
|
cmp ip, #2
|
| 216 |
|
|
USER( strbt r3, [r0], #1) @ May fault
|
| 217 |
|
|
movge r3, r3, lsr #8
|
| 218 |
|
|
USER( strgebt r3, [r0], #1) @ May fault
|
| 219 |
|
|
ldrgtb r3, [r1], #0
|
| 220 |
|
|
USER( strgtbt r3, [r0], #1) @ May fault
|
| 221 |
|
|
b .c2u_finished
|
| 222 |
|
|
|
| 223 |
|
|
.c2u_3fupi: subs r2, r2, #4
|
| 224 |
|
|
addmi ip, r2, #4
|
| 225 |
|
|
bmi .c2u_3nowords
|
| 226 |
|
|
mov r3, r7, lsr #24
|
| 227 |
|
|
ldr r7, [r1], #4
|
| 228 |
|
|
orr r3, r3, r7, lsl #8
|
| 229 |
|
|
USER( strt r3, [r0], #4) @ May fault
|
| 230 |
|
|
mov ip, r0, lsl #32 - PAGE_SHIFT
|
| 231 |
|
|
rsb ip, ip, #0
|
| 232 |
|
|
movs ip, ip, lsr #32 - PAGE_SHIFT
|
| 233 |
|
|
beq .c2u_3fupi
|
| 234 |
|
|
cmp r2, ip
|
| 235 |
|
|
movlt ip, r2
|
| 236 |
|
|
sub r2, r2, ip
|
| 237 |
|
|
subs ip, ip, #16
|
| 238 |
|
|
blt .c2u_3rem8lp
|
| 239 |
|
|
|
| 240 |
|
|
.c2u_3cpy8lp: mov r3, r7, lsr #24
|
| 241 |
|
|
ldmia r1!, {r4 - r7}
|
| 242 |
|
|
orr r3, r3, r4, lsl #8
|
| 243 |
|
|
mov r4, r4, lsr #24
|
| 244 |
|
|
orr r4, r4, r5, lsl #8
|
| 245 |
|
|
mov r5, r5, lsr #24
|
| 246 |
|
|
orr r5, r5, r6, lsl #8
|
| 247 |
|
|
mov r6, r6, lsr #24
|
| 248 |
|
|
orr r6, r6, r7, lsl #8
|
| 249 |
|
|
stmia r0!, {r3 - r6} @ Shouldnt fault
|
| 250 |
|
|
subs ip, ip, #16
|
| 251 |
|
|
bpl .c2u_3cpy8lp
|
| 252 |
|
|
.c2u_3rem8lp: tst ip, #8
|
| 253 |
|
|
movne r3, r7, lsr #24
|
| 254 |
|
|
ldmneia r1!, {r4, r7}
|
| 255 |
|
|
orrne r3, r3, r4, lsl #8
|
| 256 |
|
|
movne r4, r4, lsr #24
|
| 257 |
|
|
orrne r4, r4, r7, lsl #8
|
| 258 |
|
|
stmneia r0!, {r3 - r4} @ Shouldnt fault
|
| 259 |
|
|
tst ip, #4
|
| 260 |
|
|
movne r3, r7, lsr #24
|
| 261 |
|
|
ldrne r7, [r1], #4
|
| 262 |
|
|
orrne r3, r3, r7, lsl #8
|
| 263 |
|
|
strnet r3, [r0], #4 @ Shouldnt fault
|
| 264 |
|
|
ands ip, ip, #3
|
| 265 |
|
|
beq .c2u_3fupi
|
| 266 |
|
|
.c2u_3nowords: mov r3, r7, lsr #24
|
| 267 |
|
|
teq ip, #0
|
| 268 |
|
|
beq .c2u_finished
|
| 269 |
|
|
cmp ip, #2
|
| 270 |
|
|
USER( strbt r3, [r0], #1) @ May fault
|
| 271 |
|
|
ldrge r3, [r1], #0
|
| 272 |
|
|
USER( strgebt r3, [r0], #1) @ May fault
|
| 273 |
|
|
movgt r3, r3, lsr #8
|
| 274 |
|
|
USER( strgtbt r3, [r0], #1) @ May fault
|
| 275 |
|
|
b .c2u_finished
|
| 276 |
|
|
|
| 277 |
|
|
.section .fixup,"ax"
|
| 278 |
|
|
.align 0
|
| 279 |
|
|
9001: LOADREGS(fd,sp!, {r0, r4 - r7, pc})
|
| 280 |
|
|
.previous
|
| 281 |
|
|
|
| 282 |
|
|
/* Prototype: unsigned long __arch_copy_from_user(void *to,const void *from,unsigned long n);
|
| 283 |
|
|
* Purpose : copy a block from user memory to kernel memory
|
| 284 |
|
|
* Params : to - kernel memory
|
| 285 |
|
|
* : from - user memory
|
| 286 |
|
|
* : n - number of bytes to copy
|
| 287 |
|
|
* Returns : Number of bytes NOT copied.
|
| 288 |
|
|
*/
|
| 289 |
|
|
.cfu_dest_not_aligned:
|
| 290 |
|
|
rsb ip, ip, #4
|
| 291 |
|
|
cmp ip, #2
|
| 292 |
|
|
USER( ldrbt r3, [r1], #1) @ May fault
|
| 293 |
|
|
strb r3, [r0], #1
|
| 294 |
|
|
USER( ldrgebt r3, [r1], #1) @ May fault
|
| 295 |
|
|
strgeb r3, [r0], #1
|
| 296 |
|
|
USER( ldrgtbt r3, [r1], #1) @ May fault
|
| 297 |
|
|
strgtb r3, [r0], #1
|
| 298 |
|
|
sub r2, r2, ip
|
| 299 |
|
|
b .cfu_dest_aligned
|
| 300 |
|
|
|
| 301 |
|
|
ENTRY(__arch_copy_from_user)
|
| 302 |
|
|
stmfd sp!, {r0, r2, r4 - r7, lr}
|
| 303 |
|
|
cmp r2, #4
|
| 304 |
|
|
blt .cfu_not_enough
|
| 305 |
|
|
ands ip, r0, #3
|
| 306 |
|
|
bne .cfu_dest_not_aligned
|
| 307 |
|
|
.cfu_dest_aligned:
|
| 308 |
|
|
ands ip, r1, #3
|
| 309 |
|
|
bne .cfu_src_not_aligned
|
| 310 |
|
|
/*
|
| 311 |
|
|
* Seeing as there has to be at least 8 bytes to copy, we can
|
| 312 |
|
|
* copy one word, and force a user-mode page fault...
|
| 313 |
|
|
*/
|
| 314 |
|
|
|
| 315 |
|
|
.cfu_0fupi: subs r2, r2, #4
|
| 316 |
|
|
addmi ip, r2, #4
|
| 317 |
|
|
bmi .cfu_0nowords
|
| 318 |
|
|
USER( ldrt r3, [r1], #4)
|
| 319 |
|
|
str r3, [r0], #4
|
| 320 |
|
|
mov ip, r1, lsl #32 - PAGE_SHIFT @ On each page, use a ld/st??t instruction
|
| 321 |
|
|
rsb ip, ip, #0
|
| 322 |
|
|
movs ip, ip, lsr #32 - PAGE_SHIFT
|
| 323 |
|
|
beq .cfu_0fupi
|
| 324 |
|
|
/*
|
| 325 |
|
|
* ip = max no. of bytes to copy before needing another "strt" insn
|
| 326 |
|
|
*/
|
| 327 |
|
|
cmp r2, ip
|
| 328 |
|
|
movlt ip, r2
|
| 329 |
|
|
sub r2, r2, ip
|
| 330 |
|
|
subs ip, ip, #32
|
| 331 |
|
|
blt .cfu_0rem8lp
|
| 332 |
|
|
|
| 333 |
|
|
.cfu_0cpy8lp: ldmia r1!, {r3 - r6} @ Shouldnt fault
|
| 334 |
|
|
stmia r0!, {r3 - r6}
|
| 335 |
|
|
ldmia r1!, {r3 - r6} @ Shouldnt fault
|
| 336 |
|
|
stmia r0!, {r3 - r6}
|
| 337 |
|
|
subs ip, ip, #32
|
| 338 |
|
|
bpl .cfu_0cpy8lp
|
| 339 |
|
|
.cfu_0rem8lp: cmn ip, #16
|
| 340 |
|
|
ldmgeia r1!, {r3 - r6} @ Shouldnt fault
|
| 341 |
|
|
stmgeia r0!, {r3 - r6}
|
| 342 |
|
|
tst ip, #8
|
| 343 |
|
|
ldmneia r1!, {r3 - r4} @ Shouldnt fault
|
| 344 |
|
|
stmneia r0!, {r3 - r4}
|
| 345 |
|
|
tst ip, #4
|
| 346 |
|
|
ldrnet r3, [r1], #4 @ Shouldnt fault
|
| 347 |
|
|
strne r3, [r0], #4
|
| 348 |
|
|
ands ip, ip, #3
|
| 349 |
|
|
beq .cfu_0fupi
|
| 350 |
|
|
.cfu_0nowords: teq ip, #0
|
| 351 |
|
|
beq .cfu_finished
|
| 352 |
|
|
.cfu_nowords: cmp ip, #2
|
| 353 |
|
|
USER( ldrbt r3, [r1], #1) @ May fault
|
| 354 |
|
|
strb r3, [r0], #1
|
| 355 |
|
|
USER( ldrgebt r3, [r1], #1) @ May fault
|
| 356 |
|
|
strgeb r3, [r0], #1
|
| 357 |
|
|
USER( ldrgtbt r3, [r1], #1) @ May fault
|
| 358 |
|
|
strgtb r3, [r0], #1
|
| 359 |
|
|
b .cfu_finished
|
| 360 |
|
|
|
| 361 |
|
|
.cfu_not_enough:
|
| 362 |
|
|
movs ip, r2
|
| 363 |
|
|
bne .cfu_nowords
|
| 364 |
|
|
.cfu_finished: mov r0, #0
|
| 365 |
|
|
add sp, sp, #8
|
| 366 |
|
|
LOADREGS(fd,sp!,{r4 - r7, pc})
|
| 367 |
|
|
|
| 368 |
|
|
.cfu_src_not_aligned:
|
| 369 |
|
|
bic r1, r1, #3
|
| 370 |
|
|
USER( ldrt r7, [r1], #4) @ May fault
|
| 371 |
|
|
cmp ip, #2
|
| 372 |
|
|
bgt .cfu_3fupi
|
| 373 |
|
|
beq .cfu_2fupi
|
| 374 |
|
|
.cfu_1fupi: subs r2, r2, #4
|
| 375 |
|
|
addmi ip, r2, #4
|
| 376 |
|
|
bmi .cfu_1nowords
|
| 377 |
|
|
mov r3, r7, lsr #8
|
| 378 |
|
|
USER( ldrt r7, [r1], #4) @ May fault
|
| 379 |
|
|
orr r3, r3, r7, lsl #24
|
| 380 |
|
|
str r3, [r0], #4
|
| 381 |
|
|
mov ip, r1, lsl #32 - PAGE_SHIFT
|
| 382 |
|
|
rsb ip, ip, #0
|
| 383 |
|
|
movs ip, ip, lsr #32 - PAGE_SHIFT
|
| 384 |
|
|
beq .cfu_1fupi
|
| 385 |
|
|
cmp r2, ip
|
| 386 |
|
|
movlt ip, r2
|
| 387 |
|
|
sub r2, r2, ip
|
| 388 |
|
|
subs ip, ip, #16
|
| 389 |
|
|
blt .cfu_1rem8lp
|
| 390 |
|
|
|
| 391 |
|
|
.cfu_1cpy8lp: mov r3, r7, lsr #8
|
| 392 |
|
|
ldmia r1!, {r4 - r7} @ Shouldnt fault
|
| 393 |
|
|
orr r3, r3, r4, lsl #24
|
| 394 |
|
|
mov r4, r4, lsr #8
|
| 395 |
|
|
orr r4, r4, r5, lsl #24
|
| 396 |
|
|
mov r5, r5, lsr #8
|
| 397 |
|
|
orr r5, r5, r6, lsl #24
|
| 398 |
|
|
mov r6, r6, lsr #8
|
| 399 |
|
|
orr r6, r6, r7, lsl #24
|
| 400 |
|
|
stmia r0!, {r3 - r6}
|
| 401 |
|
|
subs ip, ip, #16
|
| 402 |
|
|
bpl .cfu_1cpy8lp
|
| 403 |
|
|
.cfu_1rem8lp: tst ip, #8
|
| 404 |
|
|
movne r3, r7, lsr #8
|
| 405 |
|
|
ldmneia r1!, {r4, r7} @ Shouldnt fault
|
| 406 |
|
|
orrne r3, r3, r4, lsl #24
|
| 407 |
|
|
movne r4, r4, lsr #8
|
| 408 |
|
|
orrne r4, r4, r7, lsl #24
|
| 409 |
|
|
stmneia r0!, {r3 - r4}
|
| 410 |
|
|
tst ip, #4
|
| 411 |
|
|
movne r3, r7, lsr #8
|
| 412 |
|
|
USER( ldrnet r7, [r1], #4) @ May fault
|
| 413 |
|
|
orrne r3, r3, r7, lsl #24
|
| 414 |
|
|
strne r3, [r0], #4
|
| 415 |
|
|
ands ip, ip, #3
|
| 416 |
|
|
beq .cfu_1fupi
|
| 417 |
|
|
.cfu_1nowords: mov r3, r7, lsr #8
|
| 418 |
|
|
teq ip, #0
|
| 419 |
|
|
beq .cfu_finished
|
| 420 |
|
|
cmp ip, #2
|
| 421 |
|
|
strb r3, [r0], #1
|
| 422 |
|
|
movge r3, r3, lsr #8
|
| 423 |
|
|
strgeb r3, [r0], #1
|
| 424 |
|
|
movgt r3, r3, lsr #8
|
| 425 |
|
|
strgtb r3, [r0], #1
|
| 426 |
|
|
b .cfu_finished
|
| 427 |
|
|
|
| 428 |
|
|
.cfu_2fupi: subs r2, r2, #4
|
| 429 |
|
|
addmi ip, r2, #4
|
| 430 |
|
|
bmi .cfu_2nowords
|
| 431 |
|
|
mov r3, r7, lsr #16
|
| 432 |
|
|
USER( ldrt r7, [r1], #4) @ May fault
|
| 433 |
|
|
orr r3, r3, r7, lsl #16
|
| 434 |
|
|
str r3, [r0], #4
|
| 435 |
|
|
mov ip, r1, lsl #32 - PAGE_SHIFT
|
| 436 |
|
|
rsb ip, ip, #0
|
| 437 |
|
|
movs ip, ip, lsr #32 - PAGE_SHIFT
|
| 438 |
|
|
beq .cfu_2fupi
|
| 439 |
|
|
cmp r2, ip
|
| 440 |
|
|
movlt ip, r2
|
| 441 |
|
|
sub r2, r2, ip
|
| 442 |
|
|
subs ip, ip, #16
|
| 443 |
|
|
blt .cfu_2rem8lp
|
| 444 |
|
|
|
| 445 |
|
|
.cfu_2cpy8lp: mov r3, r7, lsr #16
|
| 446 |
|
|
ldmia r1!, {r4 - r7} @ Shouldnt fault
|
| 447 |
|
|
orr r3, r3, r4, lsl #16
|
| 448 |
|
|
mov r4, r4, lsr #16
|
| 449 |
|
|
orr r4, r4, r5, lsl #16
|
| 450 |
|
|
mov r5, r5, lsr #16
|
| 451 |
|
|
orr r5, r5, r6, lsl #16
|
| 452 |
|
|
mov r6, r6, lsr #16
|
| 453 |
|
|
orr r6, r6, r7, lsl #16
|
| 454 |
|
|
stmia r0!, {r3 - r6}
|
| 455 |
|
|
subs ip, ip, #16
|
| 456 |
|
|
bpl .cfu_2cpy8lp
|
| 457 |
|
|
.cfu_2rem8lp: tst ip, #8
|
| 458 |
|
|
movne r3, r7, lsr #16
|
| 459 |
|
|
ldmneia r1!, {r4, r7} @ Shouldnt fault
|
| 460 |
|
|
orrne r3, r3, r4, lsl #16
|
| 461 |
|
|
movne r4, r4, lsr #16
|
| 462 |
|
|
orrne r4, r4, r7, lsl #16
|
| 463 |
|
|
stmneia r0!, {r3 - r4}
|
| 464 |
|
|
tst ip, #4
|
| 465 |
|
|
movne r3, r7, lsr #16
|
| 466 |
|
|
USER( ldrnet r7, [r1], #4) @ May fault
|
| 467 |
|
|
orrne r3, r3, r7, lsl #16
|
| 468 |
|
|
strne r3, [r0], #4
|
| 469 |
|
|
ands ip, ip, #3
|
| 470 |
|
|
beq .cfu_2fupi
|
| 471 |
|
|
.cfu_2nowords: mov r3, r7, lsr #16
|
| 472 |
|
|
teq ip, #0
|
| 473 |
|
|
beq .cfu_finished
|
| 474 |
|
|
cmp ip, #2
|
| 475 |
|
|
strb r3, [r0], #1
|
| 476 |
|
|
movge r3, r3, lsr #8
|
| 477 |
|
|
strgeb r3, [r0], #1
|
| 478 |
|
|
USER( ldrgtbt r3, [r1], #0) @ May fault
|
| 479 |
|
|
strgtb r3, [r0], #1
|
| 480 |
|
|
b .cfu_finished
|
| 481 |
|
|
|
| 482 |
|
|
.cfu_3fupi: subs r2, r2, #4
|
| 483 |
|
|
addmi ip, r2, #4
|
| 484 |
|
|
bmi .cfu_3nowords
|
| 485 |
|
|
mov r3, r7, lsr #24
|
| 486 |
|
|
USER( ldrt r7, [r1], #4) @ May fault
|
| 487 |
|
|
orr r3, r3, r7, lsl #8
|
| 488 |
|
|
str r3, [r0], #4
|
| 489 |
|
|
mov ip, r1, lsl #32 - PAGE_SHIFT
|
| 490 |
|
|
rsb ip, ip, #0
|
| 491 |
|
|
movs ip, ip, lsr #32 - PAGE_SHIFT
|
| 492 |
|
|
beq .cfu_3fupi
|
| 493 |
|
|
cmp r2, ip
|
| 494 |
|
|
movlt ip, r2
|
| 495 |
|
|
sub r2, r2, ip
|
| 496 |
|
|
subs ip, ip, #16
|
| 497 |
|
|
blt .cfu_3rem8lp
|
| 498 |
|
|
|
| 499 |
|
|
.cfu_3cpy8lp: mov r3, r7, lsr #24
|
| 500 |
|
|
ldmia r1!, {r4 - r7} @ Shouldnt fault
|
| 501 |
|
|
orr r3, r3, r4, lsl #8
|
| 502 |
|
|
mov r4, r4, lsr #24
|
| 503 |
|
|
orr r4, r4, r5, lsl #8
|
| 504 |
|
|
mov r5, r5, lsr #24
|
| 505 |
|
|
orr r5, r5, r6, lsl #8
|
| 506 |
|
|
mov r6, r6, lsr #24
|
| 507 |
|
|
orr r6, r6, r7, lsl #8
|
| 508 |
|
|
stmia r0!, {r3 - r6}
|
| 509 |
|
|
subs ip, ip, #16
|
| 510 |
|
|
bpl .cfu_3cpy8lp
|
| 511 |
|
|
.cfu_3rem8lp: tst ip, #8
|
| 512 |
|
|
movne r3, r7, lsr #24
|
| 513 |
|
|
ldmneia r1!, {r4, r7} @ Shouldnt fault
|
| 514 |
|
|
orrne r3, r3, r4, lsl #8
|
| 515 |
|
|
movne r4, r4, lsr #24
|
| 516 |
|
|
orrne r4, r4, r7, lsl #8
|
| 517 |
|
|
stmneia r0!, {r3 - r4}
|
| 518 |
|
|
tst ip, #4
|
| 519 |
|
|
movne r3, r7, lsr #24
|
| 520 |
|
|
USER( ldrnet r7, [r1], #4) @ May fault
|
| 521 |
|
|
orrne r3, r3, r7, lsl #8
|
| 522 |
|
|
strne r3, [r0], #4
|
| 523 |
|
|
ands ip, ip, #3
|
| 524 |
|
|
beq .cfu_3fupi
|
| 525 |
|
|
.cfu_3nowords: mov r3, r7, lsr #24
|
| 526 |
|
|
teq ip, #0
|
| 527 |
|
|
beq .cfu_finished
|
| 528 |
|
|
cmp ip, #2
|
| 529 |
|
|
strb r3, [r0], #1
|
| 530 |
|
|
USER( ldrget r3, [r1], #0) @ May fault
|
| 531 |
|
|
strgeb r3, [r0], #1
|
| 532 |
|
|
movgt r3, r3, lsr #8
|
| 533 |
|
|
strgtb r3, [r0], #1
|
| 534 |
|
|
b .cfu_finished
|
| 535 |
|
|
|
| 536 |
|
|
.section .fixup,"ax"
|
| 537 |
|
|
.align 0
|
| 538 |
|
|
/*
|
| 539 |
|
|
* We took an exception. r0 contains a pointer to
|
| 540 |
|
|
* the byte not copied.
|
| 541 |
|
|
*/
|
| 542 |
|
|
9001: ldr r2, [sp], #4 @ void *to
|
| 543 |
|
|
sub r2, r0, r2 @ bytes copied
|
| 544 |
|
|
ldr r1, [sp], #4 @ unsigned long count
|
| 545 |
|
|
subs r4, r1, r2 @ bytes left to copy
|
| 546 |
|
|
movne r1, r4
|
| 547 |
|
|
blne SYMBOL_NAME(__memzero)
|
| 548 |
|
|
mov r0, r4
|
| 549 |
|
|
LOADREGS(fd,sp!, {r4 - r7, pc})
|
| 550 |
|
|
.previous
|
| 551 |
|
|
|
| 552 |
|
|
/* Prototype: int __arch_clear_user(void *addr, size_t sz)
|
| 553 |
|
|
* Purpose : clear some user memory
|
| 554 |
|
|
* Params : addr - user memory address to clear
|
| 555 |
|
|
* : sz - number of bytes to clear
|
| 556 |
|
|
* Returns : number of bytes NOT cleared
|
| 557 |
|
|
*/
|
| 558 |
|
|
ENTRY(__arch_clear_user)
|
| 559 |
|
|
stmfd sp!, {r1, lr}
|
| 560 |
|
|
mov r2, #0
|
| 561 |
|
|
cmp r1, #4
|
| 562 |
|
|
blt 2f
|
| 563 |
|
|
ands ip, r0, #3
|
| 564 |
|
|
beq 1f
|
| 565 |
|
|
cmp ip, #2
|
| 566 |
|
|
USER( strbt r2, [r0], #1)
|
| 567 |
|
|
USER( strlebt r2, [r0], #1)
|
| 568 |
|
|
USER( strltbt r2, [r0], #1)
|
| 569 |
|
|
rsb ip, ip, #4
|
| 570 |
|
|
sub r1, r1, ip @ 7 6 5 4 3 2 1
|
| 571 |
|
|
1: subs r1, r1, #8 @ -1 -2 -3 -4 -5 -6 -7
|
| 572 |
|
|
USER( strplt r2, [r0], #4)
|
| 573 |
|
|
USER( strplt r2, [r0], #4)
|
| 574 |
|
|
bpl 1b
|
| 575 |
|
|
adds r1, r1, #4 @ 3 2 1 0 -1 -2 -3
|
| 576 |
|
|
USER( strplt r2, [r0], #4)
|
| 577 |
|
|
2: tst r1, #2 @ 1x 1x 0x 0x 1x 1x 0x
|
| 578 |
|
|
USER( strnebt r2, [r0], #1)
|
| 579 |
|
|
USER( strnebt r2, [r0], #1)
|
| 580 |
|
|
tst r1, #1 @ x1 x0 x1 x0 x1 x0 x1
|
| 581 |
|
|
USER( strnebt r2, [r0], #1)
|
| 582 |
|
|
mov r0, #0
|
| 583 |
|
|
LOADREGS(fd,sp!, {r1, pc})
|
| 584 |
|
|
|
| 585 |
|
|
.section .fixup,"ax"
|
| 586 |
|
|
.align 0
|
| 587 |
|
|
9001: LOADREGS(fd,sp!, {r0, pc})
|
| 588 |
|
|
.previous
|
| 589 |
|
|
|
