1/* SPDX-License-Identifier: GPL-2.0 */ 2/* checksum.S: Sparc optimized checksum code. 3 * 4 * Copyright(C) 1995 Linus Torvalds 5 * Copyright(C) 1995 Miguel de Icaza 6 * Copyright(C) 1996 David S. Miller 7 * Copyright(C) 1997 Jakub Jelinek 8 * 9 * derived from: 10 * Linux/Alpha checksum c-code 11 * Linux/ix86 inline checksum assembly 12 * RFC1071 Computing the Internet Checksum (esp. Jacobsons m68k code) 13 * David Mosberger-Tang for optimized reference c-code 14 * BSD4.4 portable checksum routine 15 */ 16 17#include <asm/errno.h> 18#include <asm/export.h> 19 20#define CSUM_BIGCHUNK(buf, offset, sum, t0, t1, t2, t3, t4, t5) \ 21 ldd [buf + offset + 0x00], t0; \ 22 ldd [buf + offset + 0x08], t2; \ 23 addxcc t0, sum, sum; \ 24 addxcc t1, sum, sum; \ 25 ldd [buf + offset + 0x10], t4; \ 26 addxcc t2, sum, sum; \ 27 addxcc t3, sum, sum; \ 28 ldd [buf + offset + 0x18], t0; \ 29 addxcc t4, sum, sum; \ 30 addxcc t5, sum, sum; \ 31 addxcc t0, sum, sum; \ 32 addxcc t1, sum, sum; 33 34#define CSUM_LASTCHUNK(buf, offset, sum, t0, t1, t2, t3) \ 35 ldd [buf - offset - 0x08], t0; \ 36 ldd [buf - offset - 0x00], t2; \ 37 addxcc t0, sum, sum; \ 38 addxcc t1, sum, sum; \ 39 addxcc t2, sum, sum; \ 40 addxcc t3, sum, sum; 41 42 /* Do end cruft out of band to get better cache patterns. */ 43csum_partial_end_cruft: 44 be 1f ! caller asks %o1 & 0x8 45 andcc %o1, 4, %g0 ! nope, check for word remaining 46 ldd [%o0], %g2 ! load two 47 addcc %g2, %o2, %o2 ! add first word to sum 48 addxcc %g3, %o2, %o2 ! add second word as well 49 add %o0, 8, %o0 ! advance buf ptr 50 addx %g0, %o2, %o2 ! add in final carry 51 andcc %o1, 4, %g0 ! check again for word remaining 521: be 1f ! nope, skip this code 53 andcc %o1, 3, %o1 ! check for trailing bytes 54 ld [%o0], %g2 ! load it 55 addcc %g2, %o2, %o2 ! add to sum 56 add %o0, 4, %o0 ! advance buf ptr 57 addx %g0, %o2, %o2 ! add in final carry 58 andcc %o1, 3, %g0 ! check again for trailing bytes 591: be 1f ! no trailing bytes, return 60 addcc %o1, -1, %g0 ! only one byte remains? 61 bne 2f ! at least two bytes more 62 subcc %o1, 2, %o1 ! only two bytes more? 63 b 4f ! only one byte remains 64 or %g0, %g0, %o4 ! clear fake hword value 652: lduh [%o0], %o4 ! get hword 66 be 6f ! jmp if only hword remains 67 add %o0, 2, %o0 ! advance buf ptr either way 68 sll %o4, 16, %o4 ! create upper hword 694: ldub [%o0], %o5 ! get final byte 70 sll %o5, 8, %o5 ! put into place 71 or %o5, %o4, %o4 ! coalese with hword (if any) 726: addcc %o4, %o2, %o2 ! add to sum 731: retl ! get outta here 74 addx %g0, %o2, %o0 ! add final carry into retval 75 76 /* Also do alignment out of band to get better cache patterns. */ 77csum_partial_fix_alignment: 78 cmp %o1, 6 79 bl cpte - 0x4 80 andcc %o0, 0x2, %g0 81 be 1f 82 andcc %o0, 0x4, %g0 83 lduh [%o0 + 0x00], %g2 84 sub %o1, 2, %o1 85 add %o0, 2, %o0 86 sll %g2, 16, %g2 87 addcc %g2, %o2, %o2 88 srl %o2, 16, %g3 89 addx %g0, %g3, %g2 90 sll %o2, 16, %o2 91 sll %g2, 16, %g3 92 srl %o2, 16, %o2 93 andcc %o0, 0x4, %g0 94 or %g3, %o2, %o2 951: be cpa 96 andcc %o1, 0xffffff80, %o3 97 ld [%o0 + 0x00], %g2 98 sub %o1, 4, %o1 99 addcc %g2, %o2, %o2 100 add %o0, 4, %o0 101 addx %g0, %o2, %o2 102 b cpa 103 andcc %o1, 0xffffff80, %o3 104 105 /* The common case is to get called with a nicely aligned 106 * buffer of size 0x20. Follow the code path for that case. 107 */ 108 .globl csum_partial 109 EXPORT_SYMBOL(csum_partial) 110csum_partial: /* %o0=buf, %o1=len, %o2=sum */ 111 andcc %o0, 0x7, %g0 ! alignment problems? 112 bne csum_partial_fix_alignment ! yep, handle it 113 sethi %hi(cpte - 8), %g7 ! prepare table jmp ptr 114 andcc %o1, 0xffffff80, %o3 ! num loop iterations 115cpa: be 3f ! none to do 116 andcc %o1, 0x70, %g1 ! clears carry flag too 1175: CSUM_BIGCHUNK(%o0, 0x00, %o2, %o4, %o5, %g2, %g3, %g4, %g5) 118 CSUM_BIGCHUNK(%o0, 0x20, %o2, %o4, %o5, %g2, %g3, %g4, %g5) 119 CSUM_BIGCHUNK(%o0, 0x40, %o2, %o4, %o5, %g2, %g3, %g4, %g5) 120 CSUM_BIGCHUNK(%o0, 0x60, %o2, %o4, %o5, %g2, %g3, %g4, %g5) 121 addx %g0, %o2, %o2 ! sink in final carry 122 subcc %o3, 128, %o3 ! detract from loop iters 123 bne 5b ! more to do 124 add %o0, 128, %o0 ! advance buf ptr 125 andcc %o1, 0x70, %g1 ! clears carry flag too 1263: be cpte ! nope 127 andcc %o1, 0xf, %g0 ! anything left at all? 128 srl %g1, 1, %o4 ! compute offset 129 sub %g7, %g1, %g7 ! adjust jmp ptr 130 sub %g7, %o4, %g7 ! final jmp ptr adjust 131 jmp %g7 + %lo(cpte - 8) ! enter the table 132 add %o0, %g1, %o0 ! advance buf ptr 133cptbl: CSUM_LASTCHUNK(%o0, 0x68, %o2, %g2, %g3, %g4, %g5) 134 CSUM_LASTCHUNK(%o0, 0x58, %o2, %g2, %g3, %g4, %g5) 135 CSUM_LASTCHUNK(%o0, 0x48, %o2, %g2, %g3, %g4, %g5) 136 CSUM_LASTCHUNK(%o0, 0x38, %o2, %g2, %g3, %g4, %g5) 137 CSUM_LASTCHUNK(%o0, 0x28, %o2, %g2, %g3, %g4, %g5) 138 CSUM_LASTCHUNK(%o0, 0x18, %o2, %g2, %g3, %g4, %g5) 139 CSUM_LASTCHUNK(%o0, 0x08, %o2, %g2, %g3, %g4, %g5) 140 addx %g0, %o2, %o2 ! fetch final carry 141 andcc %o1, 0xf, %g0 ! anything left at all? 142cpte: bne csum_partial_end_cruft ! yep, handle it 143 andcc %o1, 8, %g0 ! check how much 144cpout: retl ! get outta here 145 mov %o2, %o0 ! return computed csum 146 147 .globl __csum_partial_copy_start, __csum_partial_copy_end 148__csum_partial_copy_start: 149 150/* Work around cpp -rob */ 151#define ALLOC #alloc 152#define EXECINSTR #execinstr 153#define EX(x,y,a,b) \ 15498: x,y; \ 155 .section .fixup,ALLOC,EXECINSTR; \ 156 .align 4; \ 15799: ba 30f; \ 158 a, b, %o3; \ 159 .section __ex_table,ALLOC; \ 160 .align 4; \ 161 .word 98b, 99b; \ 162 .text; \ 163 .align 4 164 165#define EX2(x,y) \ 16698: x,y; \ 167 .section __ex_table,ALLOC; \ 168 .align 4; \ 169 .word 98b, 30f; \ 170 .text; \ 171 .align 4 172 173#define EX3(x,y) \ 17498: x,y; \ 175 .section __ex_table,ALLOC; \ 176 .align 4; \ 177 .word 98b, 96f; \ 178 .text; \ 179 .align 4 180 181#define EXT(start,end,handler) \ 182 .section __ex_table,ALLOC; \ 183 .align 4; \ 184 .word start, 0, end, handler; \ 185 .text; \ 186 .align 4 187 188 /* This aligned version executes typically in 8.5 superscalar cycles, this 189 * is the best I can do. I say 8.5 because the final add will pair with 190 * the next ldd in the main unrolled loop. Thus the pipe is always full. 191 * If you change these macros (including order of instructions), 192 * please check the fixup code below as well. 193 */ 194#define CSUMCOPY_BIGCHUNK_ALIGNED(src, dst, sum, off, t0, t1, t2, t3, t4, t5, t6, t7) \ 195 ldd [src + off + 0x00], t0; \ 196 ldd [src + off + 0x08], t2; \ 197 addxcc t0, sum, sum; \ 198 ldd [src + off + 0x10], t4; \ 199 addxcc t1, sum, sum; \ 200 ldd [src + off + 0x18], t6; \ 201 addxcc t2, sum, sum; \ 202 std t0, [dst + off + 0x00]; \ 203 addxcc t3, sum, sum; \ 204 std t2, [dst + off + 0x08]; \ 205 addxcc t4, sum, sum; \ 206 std t4, [dst + off + 0x10]; \ 207 addxcc t5, sum, sum; \ 208 std t6, [dst + off + 0x18]; \ 209 addxcc t6, sum, sum; \ 210 addxcc t7, sum, sum; 211 212 /* 12 superscalar cycles seems to be the limit for this case, 213 * because of this we thus do all the ldd's together to get 214 * Viking MXCC into streaming mode. Ho hum... 215 */ 216#define CSUMCOPY_BIGCHUNK(src, dst, sum, off, t0, t1, t2, t3, t4, t5, t6, t7) \ 217 ldd [src + off + 0x00], t0; \ 218 ldd [src + off + 0x08], t2; \ 219 ldd [src + off + 0x10], t4; \ 220 ldd [src + off + 0x18], t6; \ 221 st t0, [dst + off + 0x00]; \ 222 addxcc t0, sum, sum; \ 223 st t1, [dst + off + 0x04]; \ 224 addxcc t1, sum, sum; \ 225 st t2, [dst + off + 0x08]; \ 226 addxcc t2, sum, sum; \ 227 st t3, [dst + off + 0x0c]; \ 228 addxcc t3, sum, sum; \ 229 st t4, [dst + off + 0x10]; \ 230 addxcc t4, sum, sum; \ 231 st t5, [dst + off + 0x14]; \ 232 addxcc t5, sum, sum; \ 233 st t6, [dst + off + 0x18]; \ 234 addxcc t6, sum, sum; \ 235 st t7, [dst + off + 0x1c]; \ 236 addxcc t7, sum, sum; 237 238 /* Yuck, 6 superscalar cycles... */ 239#define CSUMCOPY_LASTCHUNK(src, dst, sum, off, t0, t1, t2, t3) \ 240 ldd [src - off - 0x08], t0; \ 241 ldd [src - off - 0x00], t2; \ 242 addxcc t0, sum, sum; \ 243 st t0, [dst - off - 0x08]; \ 244 addxcc t1, sum, sum; \ 245 st t1, [dst - off - 0x04]; \ 246 addxcc t2, sum, sum; \ 247 st t2, [dst - off - 0x00]; \ 248 addxcc t3, sum, sum; \ 249 st t3, [dst - off + 0x04]; 250 251 /* Handle the end cruft code out of band for better cache patterns. */ 252cc_end_cruft: 253 be 1f 254 andcc %o3, 4, %g0 255 EX(ldd [%o0 + 0x00], %g2, and %o3, 0xf) 256 add %o1, 8, %o1 257 addcc %g2, %g7, %g7 258 add %o0, 8, %o0 259 addxcc %g3, %g7, %g7 260 EX2(st %g2, [%o1 - 0x08]) 261 addx %g0, %g7, %g7 262 andcc %o3, 4, %g0 263 EX2(st %g3, [%o1 - 0x04]) 2641: be 1f 265 andcc %o3, 3, %o3 266 EX(ld [%o0 + 0x00], %g2, add %o3, 4) 267 add %o1, 4, %o1 268 addcc %g2, %g7, %g7 269 EX2(st %g2, [%o1 - 0x04]) 270 addx %g0, %g7, %g7 271 andcc %o3, 3, %g0 272 add %o0, 4, %o0 2731: be 1f 274 addcc %o3, -1, %g0 275 bne 2f 276 subcc %o3, 2, %o3 277 b 4f 278 or %g0, %g0, %o4 2792: EX(lduh [%o0 + 0x00], %o4, add %o3, 2) 280 add %o0, 2, %o0 281 EX2(sth %o4, [%o1 + 0x00]) 282 be 6f 283 add %o1, 2, %o1 284 sll %o4, 16, %o4 2854: EX(ldub [%o0 + 0x00], %o5, add %g0, 1) 286 EX2(stb %o5, [%o1 + 0x00]) 287 sll %o5, 8, %o5 288 or %o5, %o4, %o4 2896: addcc %o4, %g7, %g7 2901: retl 291 addx %g0, %g7, %o0 292 293 /* Also, handle the alignment code out of band. */ 294cc_dword_align: 295 cmp %g1, 16 296 bge 1f 297 srl %g1, 1, %o3 2982: cmp %o3, 0 299 be,a ccte 300 andcc %g1, 0xf, %o3 301 andcc %o3, %o0, %g0 ! Check %o0 only (%o1 has the same last 2 bits) 302 be,a 2b 303 srl %o3, 1, %o3 3041: andcc %o0, 0x1, %g0 305 bne ccslow 306 andcc %o0, 0x2, %g0 307 be 1f 308 andcc %o0, 0x4, %g0 309 EX(lduh [%o0 + 0x00], %g4, add %g1, 0) 310 sub %g1, 2, %g1 311 EX2(sth %g4, [%o1 + 0x00]) 312 add %o0, 2, %o0 313 sll %g4, 16, %g4 314 addcc %g4, %g7, %g7 315 add %o1, 2, %o1 316 srl %g7, 16, %g3 317 addx %g0, %g3, %g4 318 sll %g7, 16, %g7 319 sll %g4, 16, %g3 320 srl %g7, 16, %g7 321 andcc %o0, 0x4, %g0 322 or %g3, %g7, %g7 3231: be 3f 324 andcc %g1, 0xffffff80, %g0 325 EX(ld [%o0 + 0x00], %g4, add %g1, 0) 326 sub %g1, 4, %g1 327 EX2(st %g4, [%o1 + 0x00]) 328 add %o0, 4, %o0 329 addcc %g4, %g7, %g7 330 add %o1, 4, %o1 331 addx %g0, %g7, %g7 332 b 3f 333 andcc %g1, 0xffffff80, %g0 334 335 /* Sun, you just can't beat me, you just can't. Stop trying, 336 * give up. I'm serious, I am going to kick the living shit 337 * out of you, game over, lights out. 338 */ 339 .align 8 340 .globl __csum_partial_copy_sparc_generic 341 EXPORT_SYMBOL(__csum_partial_copy_sparc_generic) 342__csum_partial_copy_sparc_generic: 343 /* %o0=src, %o1=dest, %g1=len, %g7=sum */ 344 xor %o0, %o1, %o4 ! get changing bits 345 andcc %o4, 3, %g0 ! check for mismatched alignment 346 bne ccslow ! better this than unaligned/fixups 347 andcc %o0, 7, %g0 ! need to align things? 348 bne cc_dword_align ! yes, we check for short lengths there 349 andcc %g1, 0xffffff80, %g0 ! can we use unrolled loop? 3503: be 3f ! nope, less than one loop remains 351 andcc %o1, 4, %g0 ! dest aligned on 4 or 8 byte boundary? 352 be ccdbl + 4 ! 8 byte aligned, kick ass 3535: CSUMCOPY_BIGCHUNK(%o0,%o1,%g7,0x00,%o4,%o5,%g2,%g3,%g4,%g5,%o2,%o3) 354 CSUMCOPY_BIGCHUNK(%o0,%o1,%g7,0x20,%o4,%o5,%g2,%g3,%g4,%g5,%o2,%o3) 355 CSUMCOPY_BIGCHUNK(%o0,%o1,%g7,0x40,%o4,%o5,%g2,%g3,%g4,%g5,%o2,%o3) 356 CSUMCOPY_BIGCHUNK(%o0,%o1,%g7,0x60,%o4,%o5,%g2,%g3,%g4,%g5,%o2,%o3) 35710: EXT(5b, 10b, 20f) ! note for exception handling 358 sub %g1, 128, %g1 ! detract from length 359 addx %g0, %g7, %g7 ! add in last carry bit 360 andcc %g1, 0xffffff80, %g0 ! more to csum? 361 add %o0, 128, %o0 ! advance src ptr 362 bne 5b ! we did not go negative, continue looping 363 add %o1, 128, %o1 ! advance dest ptr 3643: andcc %g1, 0x70, %o2 ! can use table? 365ccmerge:be ccte ! nope, go and check for end cruft 366 andcc %g1, 0xf, %o3 ! get low bits of length (clears carry btw) 367 srl %o2, 1, %o4 ! begin negative offset computation 368 sethi %hi(12f), %o5 ! set up table ptr end 369 add %o0, %o2, %o0 ! advance src ptr 370 sub %o5, %o4, %o5 ! continue table calculation 371 sll %o2, 1, %g2 ! constant multiplies are fun... 372 sub %o5, %g2, %o5 ! some more adjustments 373 jmp %o5 + %lo(12f) ! jump into it, duff style, wheee... 374 add %o1, %o2, %o1 ! advance dest ptr (carry is clear btw) 375cctbl: CSUMCOPY_LASTCHUNK(%o0,%o1,%g7,0x68,%g2,%g3,%g4,%g5) 376 CSUMCOPY_LASTCHUNK(%o0,%o1,%g7,0x58,%g2,%g3,%g4,%g5) 377 CSUMCOPY_LASTCHUNK(%o0,%o1,%g7,0x48,%g2,%g3,%g4,%g5) 378 CSUMCOPY_LASTCHUNK(%o0,%o1,%g7,0x38,%g2,%g3,%g4,%g5) 379 CSUMCOPY_LASTCHUNK(%o0,%o1,%g7,0x28,%g2,%g3,%g4,%g5) 380 CSUMCOPY_LASTCHUNK(%o0,%o1,%g7,0x18,%g2,%g3,%g4,%g5) 381 CSUMCOPY_LASTCHUNK(%o0,%o1,%g7,0x08,%g2,%g3,%g4,%g5) 38212: EXT(cctbl, 12b, 22f) ! note for exception table handling 383 addx %g0, %g7, %g7 384 andcc %o3, 0xf, %g0 ! check for low bits set 385ccte: bne cc_end_cruft ! something left, handle it out of band 386 andcc %o3, 8, %g0 ! begin checks for that code 387 retl ! return 388 mov %g7, %o0 ! give em the computed checksum 389ccdbl: CSUMCOPY_BIGCHUNK_ALIGNED(%o0,%o1,%g7,0x00,%o4,%o5,%g2,%g3,%g4,%g5,%o2,%o3) 390 CSUMCOPY_BIGCHUNK_ALIGNED(%o0,%o1,%g7,0x20,%o4,%o5,%g2,%g3,%g4,%g5,%o2,%o3) 391 CSUMCOPY_BIGCHUNK_ALIGNED(%o0,%o1,%g7,0x40,%o4,%o5,%g2,%g3,%g4,%g5,%o2,%o3) 392 CSUMCOPY_BIGCHUNK_ALIGNED(%o0,%o1,%g7,0x60,%o4,%o5,%g2,%g3,%g4,%g5,%o2,%o3) 39311: EXT(ccdbl, 11b, 21f) ! note for exception table handling 394 sub %g1, 128, %g1 ! detract from length 395 addx %g0, %g7, %g7 ! add in last carry bit 396 andcc %g1, 0xffffff80, %g0 ! more to csum? 397 add %o0, 128, %o0 ! advance src ptr 398 bne ccdbl ! we did not go negative, continue looping 399 add %o1, 128, %o1 ! advance dest ptr 400 b ccmerge ! finish it off, above 401 andcc %g1, 0x70, %o2 ! can use table? (clears carry btw) 402 403ccslow: cmp %g1, 0 404 mov 0, %g5 405 bleu 4f 406 andcc %o0, 1, %o5 407 be,a 1f 408 srl %g1, 1, %g4 409 sub %g1, 1, %g1 410 EX(ldub [%o0], %g5, add %g1, 1) 411 add %o0, 1, %o0 412 EX2(stb %g5, [%o1]) 413 srl %g1, 1, %g4 414 add %o1, 1, %o1 4151: cmp %g4, 0 416 be,a 3f 417 andcc %g1, 1, %g0 418 andcc %o0, 2, %g0 419 be,a 1f 420 srl %g4, 1, %g4 421 EX(lduh [%o0], %o4, add %g1, 0) 422 sub %g1, 2, %g1 423 srl %o4, 8, %g2 424 sub %g4, 1, %g4 425 EX2(stb %g2, [%o1]) 426 add %o4, %g5, %g5 427 EX2(stb %o4, [%o1 + 1]) 428 add %o0, 2, %o0 429 srl %g4, 1, %g4 430 add %o1, 2, %o1 4311: cmp %g4, 0 432 be,a 2f 433 andcc %g1, 2, %g0 434 EX3(ld [%o0], %o4) 4355: srl %o4, 24, %g2 436 srl %o4, 16, %g3 437 EX2(stb %g2, [%o1]) 438 srl %o4, 8, %g2 439 EX2(stb %g3, [%o1 + 1]) 440 add %o0, 4, %o0 441 EX2(stb %g2, [%o1 + 2]) 442 addcc %o4, %g5, %g5 443 EX2(stb %o4, [%o1 + 3]) 444 addx %g5, %g0, %g5 ! I am now to lazy to optimize this (question it 445 add %o1, 4, %o1 ! is worthy). Maybe some day - with the sll/srl 446 subcc %g4, 1, %g4 ! tricks 447 bne,a 5b 448 EX3(ld [%o0], %o4) 449 sll %g5, 16, %g2 450 srl %g5, 16, %g5 451 srl %g2, 16, %g2 452 andcc %g1, 2, %g0 453 add %g2, %g5, %g5 4542: be,a 3f 455 andcc %g1, 1, %g0 456 EX(lduh [%o0], %o4, and %g1, 3) 457 andcc %g1, 1, %g0 458 srl %o4, 8, %g2 459 add %o0, 2, %o0 460 EX2(stb %g2, [%o1]) 461 add %g5, %o4, %g5 462 EX2(stb %o4, [%o1 + 1]) 463 add %o1, 2, %o1 4643: be,a 1f 465 sll %g5, 16, %o4 466 EX(ldub [%o0], %g2, add %g0, 1) 467 sll %g2, 8, %o4 468 EX2(stb %g2, [%o1]) 469 add %g5, %o4, %g5 470 sll %g5, 16, %o4 4711: addcc %o4, %g5, %g5 472 srl %g5, 16, %o4 473 addx %g0, %o4, %g5 474 orcc %o5, %g0, %g0 475 be 4f 476 srl %g5, 8, %o4 477 and %g5, 0xff, %g2 478 and %o4, 0xff, %o4 479 sll %g2, 8, %g2 480 or %g2, %o4, %g5 4814: addcc %g7, %g5, %g7 482 retl 483 addx %g0, %g7, %o0 484__csum_partial_copy_end: 485 486/* We do these strange calculations for the csum_*_from_user case only, ie. 487 * we only bother with faults on loads... */ 488 489/* o2 = ((g2%20)&3)*8 490 * o3 = g1 - (g2/20)*32 - o2 */ 49120: 492 cmp %g2, 20 493 blu,a 1f 494 and %g2, 3, %o2 495 sub %g1, 32, %g1 496 b 20b 497 sub %g2, 20, %g2 4981: 499 sll %o2, 3, %o2 500 b 31f 501 sub %g1, %o2, %o3 502 503/* o2 = (!(g2 & 15) ? 0 : (((g2 & 15) + 1) & ~1)*8) 504 * o3 = g1 - (g2/16)*32 - o2 */ 50521: 506 andcc %g2, 15, %o3 507 srl %g2, 4, %g2 508 be,a 1f 509 clr %o2 510 add %o3, 1, %o3 511 and %o3, 14, %o3 512 sll %o3, 3, %o2 5131: 514 sll %g2, 5, %g2 515 sub %g1, %g2, %o3 516 b 31f 517 sub %o3, %o2, %o3 518 519/* o0 += (g2/10)*16 - 0x70 520 * 01 += (g2/10)*16 - 0x70 521 * o2 = (g2 % 10) ? 8 : 0 522 * o3 += 0x70 - (g2/10)*16 - o2 */ 52322: 524 cmp %g2, 10 525 blu,a 1f 526 sub %o0, 0x70, %o0 527 add %o0, 16, %o0 528 add %o1, 16, %o1 529 sub %o3, 16, %o3 530 b 22b 531 sub %g2, 10, %g2 5321: 533 sub %o1, 0x70, %o1 534 add %o3, 0x70, %o3 535 clr %o2 536 tst %g2 537 bne,a 1f 538 mov 8, %o2 5391: 540 b 31f 541 sub %o3, %o2, %o3 54296: 543 and %g1, 3, %g1 544 sll %g4, 2, %g4 545 add %g1, %g4, %o3 54630: 547/* %o1 is dst 548 * %o3 is # bytes to zero out 549 * %o4 is faulting address 550 * %o5 is %pc where fault occurred */ 551 clr %o2 55231: 553/* %o0 is src 554 * %o1 is dst 555 * %o2 is # of bytes to copy from src to dst 556 * %o3 is # bytes to zero out 557 * %o4 is faulting address 558 * %o5 is %pc where fault occurred */ 559 save %sp, -104, %sp 560 mov %i5, %o0 561 mov %i7, %o1 562 mov %i4, %o2 563 call lookup_fault 564 mov %g7, %i4 565 cmp %o0, 2 566 bne 1f 567 add %g0, -EFAULT, %i5 568 tst %i2 569 be 2f 570 mov %i0, %o1 571 mov %i1, %o0 5725: 573 call memcpy 574 mov %i2, %o2 575 tst %o0 576 bne,a 2f 577 add %i3, %i2, %i3 578 add %i1, %i2, %i1 5792: 580 mov %i1, %o0 5816: 582 call __bzero 583 mov %i3, %o1 5841: 585 ld [%sp + 168], %o2 ! struct_ptr of parent 586 st %i5, [%o2] 587 ret 588 restore 589 590 .section __ex_table,#alloc 591 .align 4 592 .word 5b,2 593 .word 6b,2 594