1/* checksum.S: Sparc optimized checksum code. 2 * 3 * Copyright(C) 1995 Linus Torvalds 4 * Copyright(C) 1995 Miguel de Icaza 5 * Copyright(C) 1996 David S. Miller 6 * Copyright(C) 1997 Jakub Jelinek 7 * 8 * derived from: 9 * Linux/Alpha checksum c-code 10 * Linux/ix86 inline checksum assembly 11 * RFC1071 Computing the Internet Checksum (esp. Jacobsons m68k code) 12 * David Mosberger-Tang for optimized reference c-code 13 * BSD4.4 portable checksum routine 14 */ 15 16#include <asm/errno.h> 17 18#define CSUM_BIGCHUNK(buf, offset, sum, t0, t1, t2, t3, t4, t5) \ 19 ldd [buf + offset + 0x00], t0; \ 20 ldd [buf + offset + 0x08], t2; \ 21 addxcc t0, sum, sum; \ 22 addxcc t1, sum, sum; \ 23 ldd [buf + offset + 0x10], t4; \ 24 addxcc t2, sum, sum; \ 25 addxcc t3, sum, sum; \ 26 ldd [buf + offset + 0x18], t0; \ 27 addxcc t4, sum, sum; \ 28 addxcc t5, sum, sum; \ 29 addxcc t0, sum, sum; \ 30 addxcc t1, sum, sum; 31 32#define CSUM_LASTCHUNK(buf, offset, sum, t0, t1, t2, t3) \ 33 ldd [buf - offset - 0x08], t0; \ 34 ldd [buf - offset - 0x00], t2; \ 35 addxcc t0, sum, sum; \ 36 addxcc t1, sum, sum; \ 37 addxcc t2, sum, sum; \ 38 addxcc t3, sum, sum; 39 40 /* Do end cruft out of band to get better cache patterns. */ 41csum_partial_end_cruft: 42 be 1f ! caller asks %o1 & 0x8 43 andcc %o1, 4, %g0 ! nope, check for word remaining 44 ldd [%o0], %g2 ! load two 45 addcc %g2, %o2, %o2 ! add first word to sum 46 addxcc %g3, %o2, %o2 ! add second word as well 47 add %o0, 8, %o0 ! advance buf ptr 48 addx %g0, %o2, %o2 ! add in final carry 49 andcc %o1, 4, %g0 ! check again for word remaining 501: be 1f ! nope, skip this code 51 andcc %o1, 3, %o1 ! check for trailing bytes 52 ld [%o0], %g2 ! load it 53 addcc %g2, %o2, %o2 ! add to sum 54 add %o0, 4, %o0 ! advance buf ptr 55 addx %g0, %o2, %o2 ! add in final carry 56 andcc %o1, 3, %g0 ! check again for trailing bytes 571: be 1f ! no trailing bytes, return 58 addcc %o1, -1, %g0 ! only one byte remains? 59 bne 2f ! at least two bytes more 60 subcc %o1, 2, %o1 ! only two bytes more? 61 b 4f ! only one byte remains 62 or %g0, %g0, %o4 ! clear fake hword value 632: lduh [%o0], %o4 ! get hword 64 be 6f ! jmp if only hword remains 65 add %o0, 2, %o0 ! advance buf ptr either way 66 sll %o4, 16, %o4 ! create upper hword 674: ldub [%o0], %o5 ! get final byte 68 sll %o5, 8, %o5 ! put into place 69 or %o5, %o4, %o4 ! coalese with hword (if any) 706: addcc %o4, %o2, %o2 ! add to sum 711: retl ! get outta here 72 addx %g0, %o2, %o0 ! add final carry into retval 73 74 /* Also do alignment out of band to get better cache patterns. */ 75csum_partial_fix_alignment: 76 cmp %o1, 6 77 bl cpte - 0x4 78 andcc %o0, 0x2, %g0 79 be 1f 80 andcc %o0, 0x4, %g0 81 lduh [%o0 + 0x00], %g2 82 sub %o1, 2, %o1 83 add %o0, 2, %o0 84 sll %g2, 16, %g2 85 addcc %g2, %o2, %o2 86 srl %o2, 16, %g3 87 addx %g0, %g3, %g2 88 sll %o2, 16, %o2 89 sll %g2, 16, %g3 90 srl %o2, 16, %o2 91 andcc %o0, 0x4, %g0 92 or %g3, %o2, %o2 931: be cpa 94 andcc %o1, 0xffffff80, %o3 95 ld [%o0 + 0x00], %g2 96 sub %o1, 4, %o1 97 addcc %g2, %o2, %o2 98 add %o0, 4, %o0 99 addx %g0, %o2, %o2 100 b cpa 101 andcc %o1, 0xffffff80, %o3 102 103 /* The common case is to get called with a nicely aligned 104 * buffer of size 0x20. Follow the code path for that case. 105 */ 106 .globl csum_partial 107csum_partial: /* %o0=buf, %o1=len, %o2=sum */ 108 andcc %o0, 0x7, %g0 ! alignment problems? 109 bne csum_partial_fix_alignment ! yep, handle it 110 sethi %hi(cpte - 8), %g7 ! prepare table jmp ptr 111 andcc %o1, 0xffffff80, %o3 ! num loop iterations 112cpa: be 3f ! none to do 113 andcc %o1, 0x70, %g1 ! clears carry flag too 1145: CSUM_BIGCHUNK(%o0, 0x00, %o2, %o4, %o5, %g2, %g3, %g4, %g5) 115 CSUM_BIGCHUNK(%o0, 0x20, %o2, %o4, %o5, %g2, %g3, %g4, %g5) 116 CSUM_BIGCHUNK(%o0, 0x40, %o2, %o4, %o5, %g2, %g3, %g4, %g5) 117 CSUM_BIGCHUNK(%o0, 0x60, %o2, %o4, %o5, %g2, %g3, %g4, %g5) 118 addx %g0, %o2, %o2 ! sink in final carry 119 subcc %o3, 128, %o3 ! detract from loop iters 120 bne 5b ! more to do 121 add %o0, 128, %o0 ! advance buf ptr 122 andcc %o1, 0x70, %g1 ! clears carry flag too 1233: be cpte ! nope 124 andcc %o1, 0xf, %g0 ! anything left at all? 125 srl %g1, 1, %o4 ! compute offset 126 sub %g7, %g1, %g7 ! adjust jmp ptr 127 sub %g7, %o4, %g7 ! final jmp ptr adjust 128 jmp %g7 + %lo(cpte - 8) ! enter the table 129 add %o0, %g1, %o0 ! advance buf ptr 130cptbl: CSUM_LASTCHUNK(%o0, 0x68, %o2, %g2, %g3, %g4, %g5) 131 CSUM_LASTCHUNK(%o0, 0x58, %o2, %g2, %g3, %g4, %g5) 132 CSUM_LASTCHUNK(%o0, 0x48, %o2, %g2, %g3, %g4, %g5) 133 CSUM_LASTCHUNK(%o0, 0x38, %o2, %g2, %g3, %g4, %g5) 134 CSUM_LASTCHUNK(%o0, 0x28, %o2, %g2, %g3, %g4, %g5) 135 CSUM_LASTCHUNK(%o0, 0x18, %o2, %g2, %g3, %g4, %g5) 136 CSUM_LASTCHUNK(%o0, 0x08, %o2, %g2, %g3, %g4, %g5) 137 addx %g0, %o2, %o2 ! fetch final carry 138 andcc %o1, 0xf, %g0 ! anything left at all? 139cpte: bne csum_partial_end_cruft ! yep, handle it 140 andcc %o1, 8, %g0 ! check how much 141cpout: retl ! get outta here 142 mov %o2, %o0 ! return computed csum 143 144 .globl __csum_partial_copy_start, __csum_partial_copy_end 145__csum_partial_copy_start: 146 147/* Work around cpp -rob */ 148#define ALLOC #alloc 149#define EXECINSTR #execinstr 150#define EX(x,y,a,b) \ 15198: x,y; \ 152 .section .fixup,ALLOC,EXECINSTR; \ 153 .align 4; \ 15499: ba 30f; \ 155 a, b, %o3; \ 156 .section __ex_table,ALLOC; \ 157 .align 4; \ 158 .word 98b, 99b; \ 159 .text; \ 160 .align 4 161 162#define EX2(x,y) \ 16398: x,y; \ 164 .section __ex_table,ALLOC; \ 165 .align 4; \ 166 .word 98b, 30f; \ 167 .text; \ 168 .align 4 169 170#define EX3(x,y) \ 17198: x,y; \ 172 .section __ex_table,ALLOC; \ 173 .align 4; \ 174 .word 98b, 96f; \ 175 .text; \ 176 .align 4 177 178#define EXT(start,end,handler) \ 179 .section __ex_table,ALLOC; \ 180 .align 4; \ 181 .word start, 0, end, handler; \ 182 .text; \ 183 .align 4 184 185 /* This aligned version executes typically in 8.5 superscalar cycles, this 186 * is the best I can do. I say 8.5 because the final add will pair with 187 * the next ldd in the main unrolled loop. Thus the pipe is always full. 188 * If you change these macros (including order of instructions), 189 * please check the fixup code below as well. 190 */ 191#define CSUMCOPY_BIGCHUNK_ALIGNED(src, dst, sum, off, t0, t1, t2, t3, t4, t5, t6, t7) \ 192 ldd [src + off + 0x00], t0; \ 193 ldd [src + off + 0x08], t2; \ 194 addxcc t0, sum, sum; \ 195 ldd [src + off + 0x10], t4; \ 196 addxcc t1, sum, sum; \ 197 ldd [src + off + 0x18], t6; \ 198 addxcc t2, sum, sum; \ 199 std t0, [dst + off + 0x00]; \ 200 addxcc t3, sum, sum; \ 201 std t2, [dst + off + 0x08]; \ 202 addxcc t4, sum, sum; \ 203 std t4, [dst + off + 0x10]; \ 204 addxcc t5, sum, sum; \ 205 std t6, [dst + off + 0x18]; \ 206 addxcc t6, sum, sum; \ 207 addxcc t7, sum, sum; 208 209 /* 12 superscalar cycles seems to be the limit for this case, 210 * because of this we thus do all the ldd's together to get 211 * Viking MXCC into streaming mode. Ho hum... 212 */ 213#define CSUMCOPY_BIGCHUNK(src, dst, sum, off, t0, t1, t2, t3, t4, t5, t6, t7) \ 214 ldd [src + off + 0x00], t0; \ 215 ldd [src + off + 0x08], t2; \ 216 ldd [src + off + 0x10], t4; \ 217 ldd [src + off + 0x18], t6; \ 218 st t0, [dst + off + 0x00]; \ 219 addxcc t0, sum, sum; \ 220 st t1, [dst + off + 0x04]; \ 221 addxcc t1, sum, sum; \ 222 st t2, [dst + off + 0x08]; \ 223 addxcc t2, sum, sum; \ 224 st t3, [dst + off + 0x0c]; \ 225 addxcc t3, sum, sum; \ 226 st t4, [dst + off + 0x10]; \ 227 addxcc t4, sum, sum; \ 228 st t5, [dst + off + 0x14]; \ 229 addxcc t5, sum, sum; \ 230 st t6, [dst + off + 0x18]; \ 231 addxcc t6, sum, sum; \ 232 st t7, [dst + off + 0x1c]; \ 233 addxcc t7, sum, sum; 234 235 /* Yuck, 6 superscalar cycles... */ 236#define CSUMCOPY_LASTCHUNK(src, dst, sum, off, t0, t1, t2, t3) \ 237 ldd [src - off - 0x08], t0; \ 238 ldd [src - off - 0x00], t2; \ 239 addxcc t0, sum, sum; \ 240 st t0, [dst - off - 0x08]; \ 241 addxcc t1, sum, sum; \ 242 st t1, [dst - off - 0x04]; \ 243 addxcc t2, sum, sum; \ 244 st t2, [dst - off - 0x00]; \ 245 addxcc t3, sum, sum; \ 246 st t3, [dst - off + 0x04]; 247 248 /* Handle the end cruft code out of band for better cache patterns. */ 249cc_end_cruft: 250 be 1f 251 andcc %o3, 4, %g0 252 EX(ldd [%o0 + 0x00], %g2, and %o3, 0xf) 253 add %o1, 8, %o1 254 addcc %g2, %g7, %g7 255 add %o0, 8, %o0 256 addxcc %g3, %g7, %g7 257 EX2(st %g2, [%o1 - 0x08]) 258 addx %g0, %g7, %g7 259 andcc %o3, 4, %g0 260 EX2(st %g3, [%o1 - 0x04]) 2611: be 1f 262 andcc %o3, 3, %o3 263 EX(ld [%o0 + 0x00], %g2, add %o3, 4) 264 add %o1, 4, %o1 265 addcc %g2, %g7, %g7 266 EX2(st %g2, [%o1 - 0x04]) 267 addx %g0, %g7, %g7 268 andcc %o3, 3, %g0 269 add %o0, 4, %o0 2701: be 1f 271 addcc %o3, -1, %g0 272 bne 2f 273 subcc %o3, 2, %o3 274 b 4f 275 or %g0, %g0, %o4 2762: EX(lduh [%o0 + 0x00], %o4, add %o3, 2) 277 add %o0, 2, %o0 278 EX2(sth %o4, [%o1 + 0x00]) 279 be 6f 280 add %o1, 2, %o1 281 sll %o4, 16, %o4 2824: EX(ldub [%o0 + 0x00], %o5, add %g0, 1) 283 EX2(stb %o5, [%o1 + 0x00]) 284 sll %o5, 8, %o5 285 or %o5, %o4, %o4 2866: addcc %o4, %g7, %g7 2871: retl 288 addx %g0, %g7, %o0 289 290 /* Also, handle the alignment code out of band. */ 291cc_dword_align: 292 cmp %g1, 6 293 bl,a ccte 294 andcc %g1, 0xf, %o3 295 andcc %o0, 0x1, %g0 296 bne ccslow 297 andcc %o0, 0x2, %g0 298 be 1f 299 andcc %o0, 0x4, %g0 300 EX(lduh [%o0 + 0x00], %g4, add %g1, 0) 301 sub %g1, 2, %g1 302 EX2(sth %g4, [%o1 + 0x00]) 303 add %o0, 2, %o0 304 sll %g4, 16, %g4 305 addcc %g4, %g7, %g7 306 add %o1, 2, %o1 307 srl %g7, 16, %g3 308 addx %g0, %g3, %g4 309 sll %g7, 16, %g7 310 sll %g4, 16, %g3 311 srl %g7, 16, %g7 312 andcc %o0, 0x4, %g0 313 or %g3, %g7, %g7 3141: be 3f 315 andcc %g1, 0xffffff80, %g0 316 EX(ld [%o0 + 0x00], %g4, add %g1, 0) 317 sub %g1, 4, %g1 318 EX2(st %g4, [%o1 + 0x00]) 319 add %o0, 4, %o0 320 addcc %g4, %g7, %g7 321 add %o1, 4, %o1 322 addx %g0, %g7, %g7 323 b 3f 324 andcc %g1, 0xffffff80, %g0 325 326 /* Sun, you just can't beat me, you just can't. Stop trying, 327 * give up. I'm serious, I am going to kick the living shit 328 * out of you, game over, lights out. 329 */ 330 .align 8 331 .globl __csum_partial_copy_sparc_generic 332__csum_partial_copy_sparc_generic: 333 /* %o0=src, %o1=dest, %g1=len, %g7=sum */ 334 xor %o0, %o1, %o4 ! get changing bits 335 andcc %o4, 3, %g0 ! check for mismatched alignment 336 bne ccslow ! better this than unaligned/fixups 337 andcc %o0, 7, %g0 ! need to align things? 338 bne cc_dword_align ! yes, we check for short lengths there 339 andcc %g1, 0xffffff80, %g0 ! can we use unrolled loop? 3403: be 3f ! nope, less than one loop remains 341 andcc %o1, 4, %g0 ! dest aligned on 4 or 8 byte boundary? 342 be ccdbl + 4 ! 8 byte aligned, kick ass 3435: CSUMCOPY_BIGCHUNK(%o0,%o1,%g7,0x00,%o4,%o5,%g2,%g3,%g4,%g5,%o2,%o3) 344 CSUMCOPY_BIGCHUNK(%o0,%o1,%g7,0x20,%o4,%o5,%g2,%g3,%g4,%g5,%o2,%o3) 345 CSUMCOPY_BIGCHUNK(%o0,%o1,%g7,0x40,%o4,%o5,%g2,%g3,%g4,%g5,%o2,%o3) 346 CSUMCOPY_BIGCHUNK(%o0,%o1,%g7,0x60,%o4,%o5,%g2,%g3,%g4,%g5,%o2,%o3) 34710: EXT(5b, 10b, 20f) ! note for exception handling 348 sub %g1, 128, %g1 ! detract from length 349 addx %g0, %g7, %g7 ! add in last carry bit 350 andcc %g1, 0xffffff80, %g0 ! more to csum? 351 add %o0, 128, %o0 ! advance src ptr 352 bne 5b ! we did not go negative, continue looping 353 add %o1, 128, %o1 ! advance dest ptr 3543: andcc %g1, 0x70, %o2 ! can use table? 355ccmerge:be ccte ! nope, go and check for end cruft 356 andcc %g1, 0xf, %o3 ! get low bits of length (clears carry btw) 357 srl %o2, 1, %o4 ! begin negative offset computation 358 sethi %hi(12f), %o5 ! set up table ptr end 359 add %o0, %o2, %o0 ! advance src ptr 360 sub %o5, %o4, %o5 ! continue table calculation 361 sll %o2, 1, %g2 ! constant multiplies are fun... 362 sub %o5, %g2, %o5 ! some more adjustments 363 jmp %o5 + %lo(12f) ! jump into it, duff style, wheee... 364 add %o1, %o2, %o1 ! advance dest ptr (carry is clear btw) 365cctbl: CSUMCOPY_LASTCHUNK(%o0,%o1,%g7,0x68,%g2,%g3,%g4,%g5) 366 CSUMCOPY_LASTCHUNK(%o0,%o1,%g7,0x58,%g2,%g3,%g4,%g5) 367 CSUMCOPY_LASTCHUNK(%o0,%o1,%g7,0x48,%g2,%g3,%g4,%g5) 368 CSUMCOPY_LASTCHUNK(%o0,%o1,%g7,0x38,%g2,%g3,%g4,%g5) 369 CSUMCOPY_LASTCHUNK(%o0,%o1,%g7,0x28,%g2,%g3,%g4,%g5) 370 CSUMCOPY_LASTCHUNK(%o0,%o1,%g7,0x18,%g2,%g3,%g4,%g5) 371 CSUMCOPY_LASTCHUNK(%o0,%o1,%g7,0x08,%g2,%g3,%g4,%g5) 37212: EXT(cctbl, 12b, 22f) ! note for exception table handling 373 addx %g0, %g7, %g7 374 andcc %o3, 0xf, %g0 ! check for low bits set 375ccte: bne cc_end_cruft ! something left, handle it out of band 376 andcc %o3, 8, %g0 ! begin checks for that code 377 retl ! return 378 mov %g7, %o0 ! give em the computed checksum 379ccdbl: CSUMCOPY_BIGCHUNK_ALIGNED(%o0,%o1,%g7,0x00,%o4,%o5,%g2,%g3,%g4,%g5,%o2,%o3) 380 CSUMCOPY_BIGCHUNK_ALIGNED(%o0,%o1,%g7,0x20,%o4,%o5,%g2,%g3,%g4,%g5,%o2,%o3) 381 CSUMCOPY_BIGCHUNK_ALIGNED(%o0,%o1,%g7,0x40,%o4,%o5,%g2,%g3,%g4,%g5,%o2,%o3) 382 CSUMCOPY_BIGCHUNK_ALIGNED(%o0,%o1,%g7,0x60,%o4,%o5,%g2,%g3,%g4,%g5,%o2,%o3) 38311: EXT(ccdbl, 11b, 21f) ! note for exception table handling 384 sub %g1, 128, %g1 ! detract from length 385 addx %g0, %g7, %g7 ! add in last carry bit 386 andcc %g1, 0xffffff80, %g0 ! more to csum? 387 add %o0, 128, %o0 ! advance src ptr 388 bne ccdbl ! we did not go negative, continue looping 389 add %o1, 128, %o1 ! advance dest ptr 390 b ccmerge ! finish it off, above 391 andcc %g1, 0x70, %o2 ! can use table? (clears carry btw) 392 393ccslow: cmp %g1, 0 394 mov 0, %g5 395 bleu 4f 396 andcc %o0, 1, %o5 397 be,a 1f 398 srl %g1, 1, %g4 399 sub %g1, 1, %g1 400 EX(ldub [%o0], %g5, add %g1, 1) 401 add %o0, 1, %o0 402 EX2(stb %g5, [%o1]) 403 srl %g1, 1, %g4 404 add %o1, 1, %o1 4051: cmp %g4, 0 406 be,a 3f 407 andcc %g1, 1, %g0 408 andcc %o0, 2, %g0 409 be,a 1f 410 srl %g4, 1, %g4 411 EX(lduh [%o0], %o4, add %g1, 0) 412 sub %g1, 2, %g1 413 srl %o4, 8, %g2 414 sub %g4, 1, %g4 415 EX2(stb %g2, [%o1]) 416 add %o4, %g5, %g5 417 EX2(stb %o4, [%o1 + 1]) 418 add %o0, 2, %o0 419 srl %g4, 1, %g4 420 add %o1, 2, %o1 4211: cmp %g4, 0 422 be,a 2f 423 andcc %g1, 2, %g0 424 EX3(ld [%o0], %o4) 4255: srl %o4, 24, %g2 426 srl %o4, 16, %g3 427 EX2(stb %g2, [%o1]) 428 srl %o4, 8, %g2 429 EX2(stb %g3, [%o1 + 1]) 430 add %o0, 4, %o0 431 EX2(stb %g2, [%o1 + 2]) 432 addcc %o4, %g5, %g5 433 EX2(stb %o4, [%o1 + 3]) 434 addx %g5, %g0, %g5 ! I am now to lazy to optimize this (question it 435 add %o1, 4, %o1 ! is worthy). Maybe some day - with the sll/srl 436 subcc %g4, 1, %g4 ! tricks 437 bne,a 5b 438 EX3(ld [%o0], %o4) 439 sll %g5, 16, %g2 440 srl %g5, 16, %g5 441 srl %g2, 16, %g2 442 andcc %g1, 2, %g0 443 add %g2, %g5, %g5 4442: be,a 3f 445 andcc %g1, 1, %g0 446 EX(lduh [%o0], %o4, and %g1, 3) 447 andcc %g1, 1, %g0 448 srl %o4, 8, %g2 449 add %o0, 2, %o0 450 EX2(stb %g2, [%o1]) 451 add %g5, %o4, %g5 452 EX2(stb %o4, [%o1 + 1]) 453 add %o1, 2, %o1 4543: be,a 1f 455 sll %g5, 16, %o4 456 EX(ldub [%o0], %g2, add %g0, 1) 457 sll %g2, 8, %o4 458 EX2(stb %g2, [%o1]) 459 add %g5, %o4, %g5 460 sll %g5, 16, %o4 4611: addcc %o4, %g5, %g5 462 srl %g5, 16, %o4 463 addx %g0, %o4, %g5 464 orcc %o5, %g0, %g0 465 be 4f 466 srl %g5, 8, %o4 467 and %g5, 0xff, %g2 468 and %o4, 0xff, %o4 469 sll %g2, 8, %g2 470 or %g2, %o4, %g5 4714: addcc %g7, %g5, %g7 472 retl 473 addx %g0, %g7, %o0 474__csum_partial_copy_end: 475 476/* We do these strange calculations for the csum_*_from_user case only, ie. 477 * we only bother with faults on loads... */ 478 479/* o2 = ((g2%20)&3)*8 480 * o3 = g1 - (g2/20)*32 - o2 */ 48120: 482 cmp %g2, 20 483 blu,a 1f 484 and %g2, 3, %o2 485 sub %g1, 32, %g1 486 b 20b 487 sub %g2, 20, %g2 4881: 489 sll %o2, 3, %o2 490 b 31f 491 sub %g1, %o2, %o3 492 493/* o2 = (!(g2 & 15) ? 0 : (((g2 & 15) + 1) & ~1)*8) 494 * o3 = g1 - (g2/16)*32 - o2 */ 49521: 496 andcc %g2, 15, %o3 497 srl %g2, 4, %g2 498 be,a 1f 499 clr %o2 500 add %o3, 1, %o3 501 and %o3, 14, %o3 502 sll %o3, 3, %o2 5031: 504 sll %g2, 5, %g2 505 sub %g1, %g2, %o3 506 b 31f 507 sub %o3, %o2, %o3 508 509/* o0 += (g2/10)*16 - 0x70 510 * 01 += (g2/10)*16 - 0x70 511 * o2 = (g2 % 10) ? 8 : 0 512 * o3 += 0x70 - (g2/10)*16 - o2 */ 51322: 514 cmp %g2, 10 515 blu,a 1f 516 sub %o0, 0x70, %o0 517 add %o0, 16, %o0 518 add %o1, 16, %o1 519 sub %o3, 16, %o3 520 b 22b 521 sub %g2, 10, %g2 5221: 523 sub %o1, 0x70, %o1 524 add %o3, 0x70, %o3 525 clr %o2 526 tst %g2 527 bne,a 1f 528 mov 8, %o2 5291: 530 b 31f 531 sub %o3, %o2, %o3 53296: 533 and %g1, 3, %g1 534 sll %g4, 2, %g4 535 add %g1, %g4, %o3 53630: 537/* %o1 is dst 538 * %o3 is # bytes to zero out 539 * %o4 is faulting address 540 * %o5 is %pc where fault occurred */ 541 clr %o2 54231: 543/* %o0 is src 544 * %o1 is dst 545 * %o2 is # of bytes to copy from src to dst 546 * %o3 is # bytes to zero out 547 * %o4 is faulting address 548 * %o5 is %pc where fault occurred */ 549 save %sp, -104, %sp 550 mov %i5, %o0 551 mov %i7, %o1 552 mov %i4, %o2 553 call lookup_fault 554 mov %g7, %i4 555 cmp %o0, 2 556 bne 1f 557 add %g0, -EFAULT, %i5 558 tst %i2 559 be 2f 560 mov %i0, %o1 561 mov %i1, %o0 5625: 563 call memcpy 564 mov %i2, %o2 565 tst %o0 566 bne,a 2f 567 add %i3, %i2, %i3 568 add %i1, %i2, %i1 5692: 570 mov %i1, %o0 5716: 572 call __bzero 573 mov %i3, %o1 5741: 575 ld [%sp + 168], %o2 ! struct_ptr of parent 576 st %i5, [%o2] 577 ret 578 restore 579 580 .section __ex_table,#alloc 581 .align 4 582 .word 5b,2 583 .word 6b,2 584