Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * User Space Access Routines |
| 3 | * |
| 4 | * Copyright (C) 2000-2002 Hewlett-Packard (John Marvin) |
| 5 | * Copyright (C) 2000 Richard Hirst <rhirst with parisc-linux.org> |
| 6 | * Copyright (C) 2001 Matthieu Delahaye <delahaym at esiee.fr> |
| 7 | * Copyright (C) 2003 Randolph Chung <tausq with parisc-linux.org> |
Helge Deller | 76343bf | 2017-03-29 21:41:05 +0200 | [diff] [blame] | 8 | * Copyright (C) 2017 Helge Deller <deller@gmx.de> |
| 9 | * Copyright (C) 2017 John David Anglin <dave.anglin@bell.net> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 10 | * |
| 11 | * |
| 12 | * This program is free software; you can redistribute it and/or modify |
| 13 | * it under the terms of the GNU General Public License as published by |
| 14 | * the Free Software Foundation; either version 2, or (at your option) |
| 15 | * any later version. |
| 16 | * |
| 17 | * This program is distributed in the hope that it will be useful, |
| 18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 20 | * GNU General Public License for more details. |
| 21 | * |
| 22 | * You should have received a copy of the GNU General Public License |
| 23 | * along with this program; if not, write to the Free Software |
| 24 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 25 | */ |
| 26 | |
| 27 | /* |
| 28 | * These routines still have plenty of room for optimization |
| 29 | * (word & doubleword load/store, dual issue, store hints, etc.). |
| 30 | */ |
| 31 | |
| 32 | /* |
| 33 | * The following routines assume that space register 3 (sr3) contains |
| 34 | * the space id associated with the current users address space. |
| 35 | */ |
| 36 | |
| 37 | |
Kyle McMartin | dfcf753 | 2008-05-22 14:36:31 -0400 | [diff] [blame] | 38 | .text |
| 39 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | #include <asm/assembly.h> |
| 41 | #include <asm/errno.h> |
Helge Deller | 0b3d643 | 2007-01-28 14:52:57 +0100 | [diff] [blame] | 42 | #include <linux/linkage.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | |
| 44 | /* |
| 45 | * get_sr gets the appropriate space value into |
| 46 | * sr1 for kernel/user space access, depending |
| 47 | * on the flag stored in the task structure. |
| 48 | */ |
| 49 | |
| 50 | .macro get_sr |
| 51 | mfctl %cr30,%r1 |
| 52 | ldw TI_SEGMENT(%r1),%r22 |
| 53 | mfsp %sr3,%r1 |
| 54 | or,<> %r22,%r0,%r0 |
| 55 | copy %r0,%r1 |
| 56 | mtsp %r1,%sr1 |
| 57 | .endm |
| 58 | |
| 59 | .macro fixup_branch lbl |
| 60 | ldil L%\lbl, %r1 |
| 61 | ldo R%\lbl(%r1), %r1 |
| 62 | bv %r0(%r1) |
| 63 | .endm |
| 64 | |
| 65 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | * unsigned long lclear_user(void *to, unsigned long n) |
| 67 | * |
| 68 | * Returns 0 for success. |
| 69 | * otherwise, returns number of bytes not transferred. |
| 70 | */ |
| 71 | |
Helge Deller | f39cce6 | 2016-10-05 22:28:46 +0200 | [diff] [blame] | 72 | ENTRY_CFI(lclear_user) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | .proc |
| 74 | .callinfo NO_CALLS |
| 75 | .entry |
| 76 | comib,=,n 0,%r25,$lclu_done |
| 77 | get_sr |
| 78 | $lclu_loop: |
| 79 | addib,<> -1,%r25,$lclu_loop |
| 80 | 1: stbs,ma %r0,1(%sr1,%r26) |
| 81 | |
| 82 | $lclu_done: |
| 83 | bv %r0(%r2) |
| 84 | copy %r25,%r28 |
| 85 | .exit |
Helge Deller | f39cce6 | 2016-10-05 22:28:46 +0200 | [diff] [blame] | 86 | ENDPROC_CFI(lclear_user) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | |
| 88 | .section .fixup,"ax" |
| 89 | 2: fixup_branch $lclu_done |
| 90 | ldo 1(%r25),%r25 |
| 91 | .previous |
| 92 | |
Helge Deller | 61dbbae | 2013-10-13 21:11:30 +0200 | [diff] [blame] | 93 | ASM_EXCEPTIONTABLE_ENTRY(1b,2b) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | |
| 95 | .procend |
| 96 | |
| 97 | /* |
| 98 | * long lstrnlen_user(char *s, long n) |
| 99 | * |
| 100 | * Returns 0 if exception before zero byte or reaching N, |
| 101 | * N+1 if N would be exceeded, |
| 102 | * else strlen + 1 (i.e. includes zero byte). |
| 103 | */ |
| 104 | |
Helge Deller | f39cce6 | 2016-10-05 22:28:46 +0200 | [diff] [blame] | 105 | ENTRY_CFI(lstrnlen_user) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | .proc |
| 107 | .callinfo NO_CALLS |
| 108 | .entry |
| 109 | comib,= 0,%r25,$lslen_nzero |
| 110 | copy %r26,%r24 |
| 111 | get_sr |
| 112 | 1: ldbs,ma 1(%sr1,%r26),%r1 |
| 113 | $lslen_loop: |
| 114 | comib,=,n 0,%r1,$lslen_done |
| 115 | addib,<> -1,%r25,$lslen_loop |
| 116 | 2: ldbs,ma 1(%sr1,%r26),%r1 |
| 117 | $lslen_done: |
| 118 | bv %r0(%r2) |
| 119 | sub %r26,%r24,%r28 |
| 120 | .exit |
| 121 | |
| 122 | $lslen_nzero: |
| 123 | b $lslen_done |
| 124 | ldo 1(%r26),%r26 /* special case for N == 0 */ |
Helge Deller | f39cce6 | 2016-10-05 22:28:46 +0200 | [diff] [blame] | 125 | ENDPROC_CFI(lstrnlen_user) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | |
| 127 | .section .fixup,"ax" |
| 128 | 3: fixup_branch $lslen_done |
| 129 | copy %r24,%r26 /* reset r26 so 0 is returned on fault */ |
| 130 | .previous |
| 131 | |
Helge Deller | 61dbbae | 2013-10-13 21:11:30 +0200 | [diff] [blame] | 132 | ASM_EXCEPTIONTABLE_ENTRY(1b,3b) |
| 133 | ASM_EXCEPTIONTABLE_ENTRY(2b,3b) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | |
| 135 | .procend |
| 136 | |
Helge Deller | 76343bf | 2017-03-29 21:41:05 +0200 | [diff] [blame] | 137 | |
| 138 | |
| 139 | /* |
| 140 | * unsigned long pa_memcpy(void *dstp, const void *srcp, unsigned long len) |
| 141 | * |
| 142 | * Inputs: |
| 143 | * - sr1 already contains space of source region |
| 144 | * - sr2 already contains space of destination region |
| 145 | * |
| 146 | * Returns: |
| 147 | * - number of bytes that could not be copied. |
| 148 | * On success, this will be zero. |
| 149 | * |
| 150 | * This code is based on a C-implementation of a copy routine written by |
| 151 | * Randolph Chung, which in turn was derived from the glibc. |
| 152 | * |
| 153 | * Several strategies are tried to try to get the best performance for various |
| 154 | * conditions. In the optimal case, we copy by loops that copy 32- or 16-bytes |
| 155 | * at a time using general registers. Unaligned copies are handled either by |
| 156 | * aligning the destination and then using shift-and-write method, or in a few |
| 157 | * cases by falling back to a byte-at-a-time copy. |
| 158 | * |
| 159 | * Testing with various alignments and buffer sizes shows that this code is |
| 160 | * often >10x faster than a simple byte-at-a-time copy, even for strangely |
| 161 | * aligned operands. It is interesting to note that the glibc version of memcpy |
| 162 | * (written in C) is actually quite fast already. This routine is able to beat |
| 163 | * it by 30-40% for aligned copies because of the loop unrolling, but in some |
| 164 | * cases the glibc version is still slightly faster. This lends more |
| 165 | * credibility that gcc can generate very good code as long as we are careful. |
| 166 | * |
| 167 | * Possible optimizations: |
| 168 | * - add cache prefetching |
| 169 | * - try not to use the post-increment address modifiers; they may create |
| 170 | * additional interlocks. Assumption is that those were only efficient on old |
| 171 | * machines (pre PA8000 processors) |
| 172 | */ |
| 173 | |
| 174 | dst = arg0 |
| 175 | src = arg1 |
| 176 | len = arg2 |
| 177 | end = arg3 |
| 178 | t1 = r19 |
| 179 | t2 = r20 |
| 180 | t3 = r21 |
| 181 | t4 = r22 |
| 182 | srcspc = sr1 |
| 183 | dstspc = sr2 |
| 184 | |
| 185 | t0 = r1 |
| 186 | a1 = t1 |
| 187 | a2 = t2 |
| 188 | a3 = t3 |
| 189 | a0 = t4 |
| 190 | |
| 191 | save_src = ret0 |
| 192 | save_dst = ret1 |
| 193 | save_len = r31 |
| 194 | |
| 195 | ENTRY_CFI(pa_memcpy) |
| 196 | .proc |
| 197 | .callinfo NO_CALLS |
| 198 | .entry |
| 199 | |
| 200 | /* Last destination address */ |
| 201 | add dst,len,end |
| 202 | |
| 203 | /* short copy with less than 16 bytes? */ |
Mikulas Patocka | 1681bab | 2017-04-14 14:15:20 -0400 | [diff] [blame] | 204 | cmpib,COND(>>=),n 15,len,.Lbyte_loop |
Helge Deller | 76343bf | 2017-03-29 21:41:05 +0200 | [diff] [blame] | 205 | |
| 206 | /* same alignment? */ |
| 207 | xor src,dst,t0 |
| 208 | extru t0,31,2,t1 |
| 209 | cmpib,<>,n 0,t1,.Lunaligned_copy |
| 210 | |
| 211 | #ifdef CONFIG_64BIT |
| 212 | /* only do 64-bit copies if we can get aligned. */ |
| 213 | extru t0,31,3,t1 |
| 214 | cmpib,<>,n 0,t1,.Lalign_loop32 |
| 215 | |
| 216 | /* loop until we are 64-bit aligned */ |
| 217 | .Lalign_loop64: |
| 218 | extru dst,31,3,t1 |
Mikulas Patocka | 1681bab | 2017-04-14 14:15:20 -0400 | [diff] [blame] | 219 | cmpib,=,n 0,t1,.Lcopy_loop_16_start |
Helge Deller | 76343bf | 2017-03-29 21:41:05 +0200 | [diff] [blame] | 220 | 20: ldb,ma 1(srcspc,src),t1 |
| 221 | 21: stb,ma t1,1(dstspc,dst) |
| 222 | b .Lalign_loop64 |
| 223 | ldo -1(len),len |
| 224 | |
| 225 | ASM_EXCEPTIONTABLE_ENTRY(20b,.Lcopy_done) |
| 226 | ASM_EXCEPTIONTABLE_ENTRY(21b,.Lcopy_done) |
| 227 | |
Mikulas Patocka | 1681bab | 2017-04-14 14:15:20 -0400 | [diff] [blame] | 228 | .Lcopy_loop_16_start: |
Helge Deller | 76343bf | 2017-03-29 21:41:05 +0200 | [diff] [blame] | 229 | ldi 31,t0 |
| 230 | .Lcopy_loop_16: |
| 231 | cmpb,COND(>>=),n t0,len,.Lword_loop |
| 232 | |
| 233 | 10: ldd 0(srcspc,src),t1 |
| 234 | 11: ldd 8(srcspc,src),t2 |
| 235 | ldo 16(src),src |
| 236 | 12: std,ma t1,8(dstspc,dst) |
| 237 | 13: std,ma t2,8(dstspc,dst) |
| 238 | 14: ldd 0(srcspc,src),t1 |
| 239 | 15: ldd 8(srcspc,src),t2 |
| 240 | ldo 16(src),src |
| 241 | 16: std,ma t1,8(dstspc,dst) |
| 242 | 17: std,ma t2,8(dstspc,dst) |
| 243 | |
| 244 | ASM_EXCEPTIONTABLE_ENTRY(10b,.Lcopy_done) |
| 245 | ASM_EXCEPTIONTABLE_ENTRY(11b,.Lcopy16_fault) |
| 246 | ASM_EXCEPTIONTABLE_ENTRY(12b,.Lcopy_done) |
| 247 | ASM_EXCEPTIONTABLE_ENTRY(13b,.Lcopy_done) |
| 248 | ASM_EXCEPTIONTABLE_ENTRY(14b,.Lcopy_done) |
| 249 | ASM_EXCEPTIONTABLE_ENTRY(15b,.Lcopy16_fault) |
| 250 | ASM_EXCEPTIONTABLE_ENTRY(16b,.Lcopy_done) |
| 251 | ASM_EXCEPTIONTABLE_ENTRY(17b,.Lcopy_done) |
| 252 | |
| 253 | b .Lcopy_loop_16 |
| 254 | ldo -32(len),len |
| 255 | |
| 256 | .Lword_loop: |
| 257 | cmpib,COND(>>=),n 3,len,.Lbyte_loop |
| 258 | 20: ldw,ma 4(srcspc,src),t1 |
| 259 | 21: stw,ma t1,4(dstspc,dst) |
| 260 | b .Lword_loop |
| 261 | ldo -4(len),len |
| 262 | |
| 263 | ASM_EXCEPTIONTABLE_ENTRY(20b,.Lcopy_done) |
| 264 | ASM_EXCEPTIONTABLE_ENTRY(21b,.Lcopy_done) |
| 265 | |
| 266 | #endif /* CONFIG_64BIT */ |
| 267 | |
| 268 | /* loop until we are 32-bit aligned */ |
| 269 | .Lalign_loop32: |
| 270 | extru dst,31,2,t1 |
Mikulas Patocka | 1681bab | 2017-04-14 14:15:20 -0400 | [diff] [blame] | 271 | cmpib,=,n 0,t1,.Lcopy_loop_8 |
Helge Deller | 76343bf | 2017-03-29 21:41:05 +0200 | [diff] [blame] | 272 | 20: ldb,ma 1(srcspc,src),t1 |
| 273 | 21: stb,ma t1,1(dstspc,dst) |
| 274 | b .Lalign_loop32 |
| 275 | ldo -1(len),len |
| 276 | |
| 277 | ASM_EXCEPTIONTABLE_ENTRY(20b,.Lcopy_done) |
| 278 | ASM_EXCEPTIONTABLE_ENTRY(21b,.Lcopy_done) |
| 279 | |
| 280 | |
Mikulas Patocka | 1681bab | 2017-04-14 14:15:20 -0400 | [diff] [blame] | 281 | .Lcopy_loop_8: |
Helge Deller | 76343bf | 2017-03-29 21:41:05 +0200 | [diff] [blame] | 282 | cmpib,COND(>>=),n 15,len,.Lbyte_loop |
| 283 | |
| 284 | 10: ldw 0(srcspc,src),t1 |
| 285 | 11: ldw 4(srcspc,src),t2 |
| 286 | 12: stw,ma t1,4(dstspc,dst) |
| 287 | 13: stw,ma t2,4(dstspc,dst) |
| 288 | 14: ldw 8(srcspc,src),t1 |
| 289 | 15: ldw 12(srcspc,src),t2 |
| 290 | ldo 16(src),src |
| 291 | 16: stw,ma t1,4(dstspc,dst) |
| 292 | 17: stw,ma t2,4(dstspc,dst) |
| 293 | |
| 294 | ASM_EXCEPTIONTABLE_ENTRY(10b,.Lcopy_done) |
| 295 | ASM_EXCEPTIONTABLE_ENTRY(11b,.Lcopy8_fault) |
| 296 | ASM_EXCEPTIONTABLE_ENTRY(12b,.Lcopy_done) |
| 297 | ASM_EXCEPTIONTABLE_ENTRY(13b,.Lcopy_done) |
| 298 | ASM_EXCEPTIONTABLE_ENTRY(14b,.Lcopy_done) |
| 299 | ASM_EXCEPTIONTABLE_ENTRY(15b,.Lcopy8_fault) |
| 300 | ASM_EXCEPTIONTABLE_ENTRY(16b,.Lcopy_done) |
| 301 | ASM_EXCEPTIONTABLE_ENTRY(17b,.Lcopy_done) |
| 302 | |
Mikulas Patocka | 1681bab | 2017-04-14 14:15:20 -0400 | [diff] [blame] | 303 | b .Lcopy_loop_8 |
Helge Deller | 76343bf | 2017-03-29 21:41:05 +0200 | [diff] [blame] | 304 | ldo -16(len),len |
| 305 | |
| 306 | .Lbyte_loop: |
| 307 | cmpclr,COND(<>) len,%r0,%r0 |
| 308 | b,n .Lcopy_done |
| 309 | 20: ldb 0(srcspc,src),t1 |
| 310 | ldo 1(src),src |
| 311 | 21: stb,ma t1,1(dstspc,dst) |
| 312 | b .Lbyte_loop |
| 313 | ldo -1(len),len |
| 314 | |
| 315 | ASM_EXCEPTIONTABLE_ENTRY(20b,.Lcopy_done) |
| 316 | ASM_EXCEPTIONTABLE_ENTRY(21b,.Lcopy_done) |
| 317 | |
| 318 | .Lcopy_done: |
| 319 | bv %r0(%r2) |
| 320 | sub end,dst,ret0 |
| 321 | |
| 322 | |
| 323 | /* src and dst are not aligned the same way. */ |
| 324 | /* need to go the hard way */ |
| 325 | .Lunaligned_copy: |
| 326 | /* align until dst is 32bit-word-aligned */ |
| 327 | extru dst,31,2,t1 |
Mikulas Patocka | 1681bab | 2017-04-14 14:15:20 -0400 | [diff] [blame] | 328 | cmpib,=,n 0,t1,.Lcopy_dstaligned |
Helge Deller | 76343bf | 2017-03-29 21:41:05 +0200 | [diff] [blame] | 329 | 20: ldb 0(srcspc,src),t1 |
| 330 | ldo 1(src),src |
| 331 | 21: stb,ma t1,1(dstspc,dst) |
| 332 | b .Lunaligned_copy |
| 333 | ldo -1(len),len |
| 334 | |
| 335 | ASM_EXCEPTIONTABLE_ENTRY(20b,.Lcopy_done) |
| 336 | ASM_EXCEPTIONTABLE_ENTRY(21b,.Lcopy_done) |
| 337 | |
| 338 | .Lcopy_dstaligned: |
| 339 | |
| 340 | /* store src, dst and len in safe place */ |
| 341 | copy src,save_src |
| 342 | copy dst,save_dst |
| 343 | copy len,save_len |
| 344 | |
| 345 | /* len now needs give number of words to copy */ |
| 346 | SHRREG len,2,len |
| 347 | |
| 348 | /* |
| 349 | * Copy from a not-aligned src to an aligned dst using shifts. |
| 350 | * Handles 4 words per loop. |
| 351 | */ |
| 352 | |
| 353 | depw,z src,28,2,t0 |
| 354 | subi 32,t0,t0 |
| 355 | mtsar t0 |
| 356 | extru len,31,2,t0 |
| 357 | cmpib,= 2,t0,.Lcase2 |
| 358 | /* Make src aligned by rounding it down. */ |
| 359 | depi 0,31,2,src |
| 360 | |
| 361 | cmpiclr,<> 3,t0,%r0 |
| 362 | b,n .Lcase3 |
| 363 | cmpiclr,<> 1,t0,%r0 |
| 364 | b,n .Lcase1 |
| 365 | .Lcase0: |
Mikulas Patocka | 1681bab | 2017-04-14 14:15:20 -0400 | [diff] [blame] | 366 | cmpb,COND(=) %r0,len,.Lcda_finish |
Helge Deller | 76343bf | 2017-03-29 21:41:05 +0200 | [diff] [blame] | 367 | nop |
| 368 | |
| 369 | 1: ldw,ma 4(srcspc,src), a3 |
| 370 | ASM_EXCEPTIONTABLE_ENTRY(1b,.Lcda_rdfault) |
| 371 | 1: ldw,ma 4(srcspc,src), a0 |
| 372 | ASM_EXCEPTIONTABLE_ENTRY(1b,.Lcda_rdfault) |
| 373 | b,n .Ldo3 |
| 374 | .Lcase1: |
| 375 | 1: ldw,ma 4(srcspc,src), a2 |
| 376 | ASM_EXCEPTIONTABLE_ENTRY(1b,.Lcda_rdfault) |
| 377 | 1: ldw,ma 4(srcspc,src), a3 |
| 378 | ASM_EXCEPTIONTABLE_ENTRY(1b,.Lcda_rdfault) |
| 379 | ldo -1(len),len |
Mikulas Patocka | 1681bab | 2017-04-14 14:15:20 -0400 | [diff] [blame] | 380 | cmpb,COND(=),n %r0,len,.Ldo0 |
Helge Deller | 76343bf | 2017-03-29 21:41:05 +0200 | [diff] [blame] | 381 | .Ldo4: |
| 382 | 1: ldw,ma 4(srcspc,src), a0 |
| 383 | ASM_EXCEPTIONTABLE_ENTRY(1b,.Lcda_rdfault) |
| 384 | shrpw a2, a3, %sar, t0 |
| 385 | 1: stw,ma t0, 4(dstspc,dst) |
| 386 | ASM_EXCEPTIONTABLE_ENTRY(1b,.Lcopy_done) |
| 387 | .Ldo3: |
| 388 | 1: ldw,ma 4(srcspc,src), a1 |
| 389 | ASM_EXCEPTIONTABLE_ENTRY(1b,.Lcda_rdfault) |
| 390 | shrpw a3, a0, %sar, t0 |
| 391 | 1: stw,ma t0, 4(dstspc,dst) |
| 392 | ASM_EXCEPTIONTABLE_ENTRY(1b,.Lcopy_done) |
| 393 | .Ldo2: |
| 394 | 1: ldw,ma 4(srcspc,src), a2 |
| 395 | ASM_EXCEPTIONTABLE_ENTRY(1b,.Lcda_rdfault) |
| 396 | shrpw a0, a1, %sar, t0 |
| 397 | 1: stw,ma t0, 4(dstspc,dst) |
| 398 | ASM_EXCEPTIONTABLE_ENTRY(1b,.Lcopy_done) |
| 399 | .Ldo1: |
| 400 | 1: ldw,ma 4(srcspc,src), a3 |
| 401 | ASM_EXCEPTIONTABLE_ENTRY(1b,.Lcda_rdfault) |
| 402 | shrpw a1, a2, %sar, t0 |
| 403 | 1: stw,ma t0, 4(dstspc,dst) |
| 404 | ASM_EXCEPTIONTABLE_ENTRY(1b,.Lcopy_done) |
| 405 | ldo -4(len),len |
Mikulas Patocka | 1681bab | 2017-04-14 14:15:20 -0400 | [diff] [blame] | 406 | cmpb,COND(<>) %r0,len,.Ldo4 |
Helge Deller | 76343bf | 2017-03-29 21:41:05 +0200 | [diff] [blame] | 407 | nop |
| 408 | .Ldo0: |
| 409 | shrpw a2, a3, %sar, t0 |
| 410 | 1: stw,ma t0, 4(dstspc,dst) |
| 411 | ASM_EXCEPTIONTABLE_ENTRY(1b,.Lcopy_done) |
| 412 | |
| 413 | .Lcda_rdfault: |
| 414 | .Lcda_finish: |
| 415 | /* calculate new src, dst and len and jump to byte-copy loop */ |
| 416 | sub dst,save_dst,t0 |
| 417 | add save_src,t0,src |
| 418 | b .Lbyte_loop |
| 419 | sub save_len,t0,len |
| 420 | |
| 421 | .Lcase3: |
| 422 | 1: ldw,ma 4(srcspc,src), a0 |
| 423 | ASM_EXCEPTIONTABLE_ENTRY(1b,.Lcda_rdfault) |
| 424 | 1: ldw,ma 4(srcspc,src), a1 |
| 425 | ASM_EXCEPTIONTABLE_ENTRY(1b,.Lcda_rdfault) |
| 426 | b .Ldo2 |
| 427 | ldo 1(len),len |
| 428 | .Lcase2: |
| 429 | 1: ldw,ma 4(srcspc,src), a1 |
| 430 | ASM_EXCEPTIONTABLE_ENTRY(1b,.Lcda_rdfault) |
| 431 | 1: ldw,ma 4(srcspc,src), a2 |
| 432 | ASM_EXCEPTIONTABLE_ENTRY(1b,.Lcda_rdfault) |
| 433 | b .Ldo1 |
| 434 | ldo 2(len),len |
| 435 | |
| 436 | |
| 437 | /* fault exception fixup handlers: */ |
| 438 | #ifdef CONFIG_64BIT |
| 439 | .Lcopy16_fault: |
Mikulas Patocka | 1681bab | 2017-04-14 14:15:20 -0400 | [diff] [blame] | 440 | b .Lcopy_done |
| 441 | 10: std,ma t1,8(dstspc,dst) |
Helge Deller | 76343bf | 2017-03-29 21:41:05 +0200 | [diff] [blame] | 442 | ASM_EXCEPTIONTABLE_ENTRY(10b,.Lcopy_done) |
| 443 | #endif |
| 444 | |
| 445 | .Lcopy8_fault: |
Mikulas Patocka | 1681bab | 2017-04-14 14:15:20 -0400 | [diff] [blame] | 446 | b .Lcopy_done |
| 447 | 10: stw,ma t1,4(dstspc,dst) |
Helge Deller | 76343bf | 2017-03-29 21:41:05 +0200 | [diff] [blame] | 448 | ASM_EXCEPTIONTABLE_ENTRY(10b,.Lcopy_done) |
| 449 | |
| 450 | .exit |
| 451 | ENDPROC_CFI(pa_memcpy) |
| 452 | .procend |
| 453 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 454 | .end |