| blob | 0084c3361e15afa77530071ada7a6e30c3ece3b5 |
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 */
16 #include <asm/errno.h>
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;
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;
40 /* Do end cruft out of band to get better cache patterns. */
41 csum_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
50 1: 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
57 1: 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
63 2: 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
67 4: ldub [%o0], %o5 ! get final byte
68 sll %o5, 8, %o5 ! put into place
69 or %o5, %o4, %o4 ! coalese with hword (if any)
70 6: addcc %o4, %o2, %o2 ! add to sum
71 1: retl ! get outta here
72 addx %g0, %o2, %o0 ! add final carry into retval
74 /* Also do alignment out of band to get better cache patterns. */
75 csum_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
93 1: 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
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
107 csum_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
112 cpa: be 3f ! none to do
113 andcc %o1, 0x70, %g1 ! clears carry flag too
114 5: 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
123 3: 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
130 cptbl: 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?
139 cpte: bne csum_partial_end_cruft ! yep, handle it
140 andcc %o1, 8, %g0 ! check how much
141 cpout: retl ! get outta here
142 mov %o2, %o0 ! return computed csum
144 .globl __csum_partial_copy_start, __csum_partial_copy_end
145 __csum_partial_copy_start:
147 /* Work around cpp -rob */
148 #define ALLOC #alloc
149 #define EXECINSTR #execinstr
150 #define EX(x,y,a,b) \
151 98: x,y; \
152 .section .fixup,ALLOC,EXECINSTR; \
153 .align 4; \
154 99: ba 30f; \
155 a, b, %o3; \
156 .section __ex_table,ALLOC; \
157 .align 4; \
158 .word 98b, 99b; \
159 .text; \
160 .align 4
162 #define EX2(x,y) \
163 98: x,y; \
164 .section __ex_table,ALLOC; \
165 .align 4; \
166 .word 98b, 30f; \
167 .text; \
168 .align 4
170 #define EX3(x,y) \
171 98: x,y; \
172 .section __ex_table,ALLOC; \
173 .align 4; \
174 .word 98b, 96f; \
175 .text; \
176 .align 4
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
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;
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;
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];
248 /* Handle the end cruft code out of band for better cache patterns. */
249 cc_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])
261 1: 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
270 1: be 1f
271 addcc %o3, -1, %g0
272 bne 2f
273 subcc %o3, 2, %o3
274 b 4f
275 or %g0, %g0, %o4
276 2: 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
282 4: EX(ldub [%o0 + 0x00], %o5, add %g0, 1)
283 EX2(stb %o5, [%o1 + 0x00])
284 sll %o5, 8, %o5
285 or %o5, %o4, %o4
286 6: addcc %o4, %g7, %g7
287 1: retl
288 addx %g0, %g7, %o0
290 /* Also, handle the alignment code out of band. */
291 cc_dword_align:
292 cmp %g1, 16
293 bge 1f
294 srl %g1, 1, %o3
295 2: cmp %o3, 0
296 be,a ccte
297 andcc %g1, 0xf, %o3
298 andcc %o3, %o0, %g0 ! Check %o0 only (%o1 has the same last 2 bits)
299 be,a 2b
300 srl %o3, 1, %o3
301 1: andcc %o0, 0x1, %g0
302 bne ccslow
303 andcc %o0, 0x2, %g0
304 be 1f
305 andcc %o0, 0x4, %g0
306 EX(lduh [%o0 + 0x00], %g4, add %g1, 0)
307 sub %g1, 2, %g1
308 EX2(sth %g4, [%o1 + 0x00])
309 add %o0, 2, %o0
310 sll %g4, 16, %g4
311 addcc %g4, %g7, %g7
312 add %o1, 2, %o1
313 srl %g7, 16, %g3
314 addx %g0, %g3, %g4
315 sll %g7, 16, %g7
316 sll %g4, 16, %g3
317 srl %g7, 16, %g7
318 andcc %o0, 0x4, %g0
319 or %g3, %g7, %g7
320 1: be 3f
321 andcc %g1, 0xffffff80, %g0
322 EX(ld [%o0 + 0x00], %g4, add %g1, 0)
323 sub %g1, 4, %g1
324 EX2(st %g4, [%o1 + 0x00])
325 add %o0, 4, %o0
326 addcc %g4, %g7, %g7
327 add %o1, 4, %o1
328 addx %g0, %g7, %g7
329 b 3f
330 andcc %g1, 0xffffff80, %g0
332 /* Sun, you just can't beat me, you just can't. Stop trying,
333 * give up. I'm serious, I am going to kick the living shit
334 * out of you, game over, lights out.
335 */
336 .align 8
337 .globl __csum_partial_copy_sparc_generic
338 __csum_partial_copy_sparc_generic:
339 /* %o0=src, %o1=dest, %g1=len, %g7=sum */
340 xor %o0, %o1, %o4 ! get changing bits
341 andcc %o4, 3, %g0 ! check for mismatched alignment
342 bne ccslow ! better this than unaligned/fixups
343 andcc %o0, 7, %g0 ! need to align things?
344 bne cc_dword_align ! yes, we check for short lengths there
345 andcc %g1, 0xffffff80, %g0 ! can we use unrolled loop?
346 3: be 3f ! nope, less than one loop remains
347 andcc %o1, 4, %g0 ! dest aligned on 4 or 8 byte boundary?
348 be ccdbl + 4 ! 8 byte aligned, kick ass
349 5: CSUMCOPY_BIGCHUNK(%o0,%o1,%g7,0x00,%o4,%o5,%g2,%g3,%g4,%g5,%o2,%o3)
350 CSUMCOPY_BIGCHUNK(%o0,%o1,%g7,0x20,%o4,%o5,%g2,%g3,%g4,%g5,%o2,%o3)
351 CSUMCOPY_BIGCHUNK(%o0,%o1,%g7,0x40,%o4,%o5,%g2,%g3,%g4,%g5,%o2,%o3)
352 CSUMCOPY_BIGCHUNK(%o0,%o1,%g7,0x60,%o4,%o5,%g2,%g3,%g4,%g5,%o2,%o3)
353 10: EXT(5b, 10b, 20f) ! note for exception handling
354 sub %g1, 128, %g1 ! detract from length
355 addx %g0, %g7, %g7 ! add in last carry bit
356 andcc %g1, 0xffffff80, %g0 ! more to csum?
357 add %o0, 128, %o0 ! advance src ptr
358 bne 5b ! we did not go negative, continue looping
359 add %o1, 128, %o1 ! advance dest ptr
360 3: andcc %g1, 0x70, %o2 ! can use table?
361 ccmerge:be ccte ! nope, go and check for end cruft
362 andcc %g1, 0xf, %o3 ! get low bits of length (clears carry btw)
363 srl %o2, 1, %o4 ! begin negative offset computation
364 sethi %hi(12f), %o5 ! set up table ptr end
365 add %o0, %o2, %o0 ! advance src ptr
366 sub %o5, %o4, %o5 ! continue table calculation
367 sll %o2, 1, %g2 ! constant multiplies are fun...
368 sub %o5, %g2, %o5 ! some more adjustments
369 jmp %o5 + %lo(12f) ! jump into it, duff style, wheee...
370 add %o1, %o2, %o1 ! advance dest ptr (carry is clear btw)
371 cctbl: CSUMCOPY_LASTCHUNK(%o0,%o1,%g7,0x68,%g2,%g3,%g4,%g5)
372 CSUMCOPY_LASTCHUNK(%o0,%o1,%g7,0x58,%g2,%g3,%g4,%g5)
373 CSUMCOPY_LASTCHUNK(%o0,%o1,%g7,0x48,%g2,%g3,%g4,%g5)
374 CSUMCOPY_LASTCHUNK(%o0,%o1,%g7,0x38,%g2,%g3,%g4,%g5)
375 CSUMCOPY_LASTCHUNK(%o0,%o1,%g7,0x28,%g2,%g3,%g4,%g5)
376 CSUMCOPY_LASTCHUNK(%o0,%o1,%g7,0x18,%g2,%g3,%g4,%g5)
377 CSUMCOPY_LASTCHUNK(%o0,%o1,%g7,0x08,%g2,%g3,%g4,%g5)
378 12: EXT(cctbl, 12b, 22f) ! note for exception table handling
379 addx %g0, %g7, %g7
380 andcc %o3, 0xf, %g0 ! check for low bits set
381 ccte: bne cc_end_cruft ! something left, handle it out of band
382 andcc %o3, 8, %g0 ! begin checks for that code
383 retl ! return
384 mov %g7, %o0 ! give em the computed checksum
385 ccdbl: CSUMCOPY_BIGCHUNK_ALIGNED(%o0,%o1,%g7,0x00,%o4,%o5,%g2,%g3,%g4,%g5,%o2,%o3)
386 CSUMCOPY_BIGCHUNK_ALIGNED(%o0,%o1,%g7,0x20,%o4,%o5,%g2,%g3,%g4,%g5,%o2,%o3)
387 CSUMCOPY_BIGCHUNK_ALIGNED(%o0,%o1,%g7,0x40,%o4,%o5,%g2,%g3,%g4,%g5,%o2,%o3)
388 CSUMCOPY_BIGCHUNK_ALIGNED(%o0,%o1,%g7,0x60,%o4,%o5,%g2,%g3,%g4,%g5,%o2,%o3)
389 11: EXT(ccdbl, 11b, 21f) ! note for exception table handling
390 sub %g1, 128, %g1 ! detract from length
391 addx %g0, %g7, %g7 ! add in last carry bit
392 andcc %g1, 0xffffff80, %g0 ! more to csum?
393 add %o0, 128, %o0 ! advance src ptr
394 bne ccdbl ! we did not go negative, continue looping
395 add %o1, 128, %o1 ! advance dest ptr
396 b ccmerge ! finish it off, above
397 andcc %g1, 0x70, %o2 ! can use table? (clears carry btw)
399 ccslow: cmp %g1, 0
400 mov 0, %g5
401 bleu 4f
402 andcc %o0, 1, %o5
403 be,a 1f
404 srl %g1, 1, %g4
405 sub %g1, 1, %g1
406 EX(ldub [%o0], %g5, add %g1, 1)
407 add %o0, 1, %o0
408 EX2(stb %g5, [%o1])
409 srl %g1, 1, %g4
410 add %o1, 1, %o1
411 1: cmp %g4, 0
412 be,a 3f
413 andcc %g1, 1, %g0
414 andcc %o0, 2, %g0
415 be,a 1f
416 srl %g4, 1, %g4
417 EX(lduh [%o0], %o4, add %g1, 0)
418 sub %g1, 2, %g1
419 srl %o4, 8, %g2
420 sub %g4, 1, %g4
421 EX2(stb %g2, [%o1])
422 add %o4, %g5, %g5
423 EX2(stb %o4, [%o1 + 1])
424 add %o0, 2, %o0
425 srl %g4, 1, %g4
426 add %o1, 2, %o1
427 1: cmp %g4, 0
428 be,a 2f
429 andcc %g1, 2, %g0
430 EX3(ld [%o0], %o4)
431 5: srl %o4, 24, %g2
432 srl %o4, 16, %g3
433 EX2(stb %g2, [%o1])
434 srl %o4, 8, %g2
435 EX2(stb %g3, [%o1 + 1])
436 add %o0, 4, %o0
437 EX2(stb %g2, [%o1 + 2])
438 addcc %o4, %g5, %g5
439 EX2(stb %o4, [%o1 + 3])
440 addx %g5, %g0, %g5 ! I am now to lazy to optimize this (question it
441 add %o1, 4, %o1 ! is worthy). Maybe some day - with the sll/srl
442 subcc %g4, 1, %g4 ! tricks
443 bne,a 5b
444 EX3(ld [%o0], %o4)
445 sll %g5, 16, %g2
446 srl %g5, 16, %g5
447 srl %g2, 16, %g2
448 andcc %g1, 2, %g0
449 add %g2, %g5, %g5
450 2: be,a 3f
451 andcc %g1, 1, %g0
452 EX(lduh [%o0], %o4, and %g1, 3)
453 andcc %g1, 1, %g0
454 srl %o4, 8, %g2
455 add %o0, 2, %o0
456 EX2(stb %g2, [%o1])
457 add %g5, %o4, %g5
458 EX2(stb %o4, [%o1 + 1])
459 add %o1, 2, %o1
460 3: be,a 1f
461 sll %g5, 16, %o4
462 EX(ldub [%o0], %g2, add %g0, 1)
463 sll %g2, 8, %o4
464 EX2(stb %g2, [%o1])
465 add %g5, %o4, %g5
466 sll %g5, 16, %o4
467 1: addcc %o4, %g5, %g5
468 srl %g5, 16, %o4
469 addx %g0, %o4, %g5
470 orcc %o5, %g0, %g0
471 be 4f
472 srl %g5, 8, %o4
473 and %g5, 0xff, %g2
474 and %o4, 0xff, %o4
475 sll %g2, 8, %g2
476 or %g2, %o4, %g5
477 4: addcc %g7, %g5, %g7
478 retl
479 addx %g0, %g7, %o0
480 __csum_partial_copy_end:
482 /* We do these strange calculations for the csum_*_from_user case only, ie.
483 * we only bother with faults on loads... */
485 /* o2 = ((g2%20)&3)*8
486 * o3 = g1 - (g2/20)*32 - o2 */
487 20:
488 cmp %g2, 20
489 blu,a 1f
490 and %g2, 3, %o2
491 sub %g1, 32, %g1
492 b 20b
493 sub %g2, 20, %g2
494 1:
495 sll %o2, 3, %o2
496 b 31f
497 sub %g1, %o2, %o3
499 /* o2 = (!(g2 & 15) ? 0 : (((g2 & 15) + 1) & ~1)*8)
500 * o3 = g1 - (g2/16)*32 - o2 */
501 21:
502 andcc %g2, 15, %o3
503 srl %g2, 4, %g2
504 be,a 1f
505 clr %o2
506 add %o3, 1, %o3
507 and %o3, 14, %o3
508 sll %o3, 3, %o2
509 1:
510 sll %g2, 5, %g2
511 sub %g1, %g2, %o3
512 b 31f
513 sub %o3, %o2, %o3
515 /* o0 += (g2/10)*16 - 0x70
516 * 01 += (g2/10)*16 - 0x70
517 * o2 = (g2 % 10) ? 8 : 0
518 * o3 += 0x70 - (g2/10)*16 - o2 */
519 22:
520 cmp %g2, 10
521 blu,a 1f
522 sub %o0, 0x70, %o0
523 add %o0, 16, %o0
524 add %o1, 16, %o1
525 sub %o3, 16, %o3
526 b 22b
527 sub %g2, 10, %g2
528 1:
529 sub %o1, 0x70, %o1
530 add %o3, 0x70, %o3
531 clr %o2
532 tst %g2
533 bne,a 1f
534 mov 8, %o2
535 1:
536 b 31f
537 sub %o3, %o2, %o3
538 96:
539 and %g1, 3, %g1
540 sll %g4, 2, %g4
541 add %g1, %g4, %o3
542 30:
543 /* %o1 is dst
544 * %o3 is # bytes to zero out
545 * %o4 is faulting address
546 * %o5 is %pc where fault occurred */
547 clr %o2
548 31:
549 /* %o0 is src
550 * %o1 is dst
551 * %o2 is # of bytes to copy from src to dst
552 * %o3 is # bytes to zero out
553 * %o4 is faulting address
554 * %o5 is %pc where fault occurred */
555 save %sp, -104, %sp
556 mov %i5, %o0
557 mov %i7, %o1
558 mov %i4, %o2
559 call lookup_fault
560 mov %g7, %i4
561 cmp %o0, 2
562 bne 1f
563 add %g0, -EFAULT, %i5
564 tst %i2
565 be 2f
566 mov %i0, %o1
567 mov %i1, %o0
568 5:
569 call memcpy
570 mov %i2, %o2
571 tst %o0
572 bne,a 2f
573 add %i3, %i2, %i3
574 add %i1, %i2, %i1
575 2:
576 mov %i1, %o0
577 6:
578 call __bzero
579 mov %i3, %o1
580 1:
581 ld [%sp + 168], %o2 ! struct_ptr of parent
582 st %i5, [%o2]
583 ret
584 restore
586 .section __ex_table,#alloc
587 .align 4
588 .word 5b,2
589 .word 6b,2