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-rw-r--r--arch/sparc/lib/checksum.S583
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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
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