Root/arch/sparc/lib/checksum_32.S

Source at commit 0de2b2b3be81048189a32f7a3d3ba0ba9ec817b6 created 11 years 11 months ago.
By Maarten ter Huurne, MIPS: JZ4740: Fixed value for round robin constant.
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, 16
293    bge 1f
294     srl %g1, 1, %o3
2952: 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
3011: 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
3201: 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
331
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?
3463: 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
3495: 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)
35310: 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
3603: andcc %g1, 0x70, %o2 ! can use table?
361ccmerge: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)
371cctbl: 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)
37812: EXT(cctbl, 12b, 22f) ! note for exception table handling
379    addx %g0, %g7, %g7
380    andcc %o3, 0xf, %g0 ! check for low bits set
381ccte: 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
385ccdbl: 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)
38911: 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)
398
399ccslow: 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
4111: 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
4271: cmp %g4, 0
428    be,a 2f
429     andcc %g1, 2, %g0
430    EX3(ld [%o0], %o4)
4315: 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
4502: 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
4603: 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
4671: 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
4774: addcc %g7, %g5, %g7
478    retl
479     addx %g0, %g7, %o0
480__csum_partial_copy_end:
481
482/* We do these strange calculations for the csum_*_from_user case only, ie.
483 * we only bother with faults on loads... */
484
485/* o2 = ((g2%20)&3)*8
486 * o3 = g1 - (g2/20)*32 - o2 */
48720:
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
4941:
495    sll %o2, 3, %o2
496    b 31f
497     sub %g1, %o2, %o3
498
499/* o2 = (!(g2 & 15) ? 0 : (((g2 & 15) + 1) & ~1)*8)
500 * o3 = g1 - (g2/16)*32 - o2 */
50121:
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
5091:
510    sll %g2, 5, %g2
511    sub %g1, %g2, %o3
512    b 31f
513     sub %o3, %o2, %o3
514
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 */
51922:
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
5281:
529    sub %o1, 0x70, %o1
530    add %o3, 0x70, %o3
531    clr %o2
532    tst %g2
533    bne,a 1f
534     mov 8, %o2
5351:
536    b 31f
537     sub %o3, %o2, %o3
53896:
539    and %g1, 3, %g1
540    sll %g4, 2, %g4
541    add %g1, %g4, %o3
54230:
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
54831:
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
5685:
569    call memcpy
570     mov %i2, %o2
571    tst %o0
572    bne,a 2f
573     add %i3, %i2, %i3
574    add %i1, %i2, %i1
5752:
576    mov %i1, %o0
5776:
578    call __bzero
579     mov %i3, %o1
5801:
581    ld [%sp + 168], %o2 ! struct_ptr of parent
582    st %i5, [%o2]
583    ret
584     restore
585
586        .section __ex_table,#alloc
587        .align 4
588        .word 5b,2
589    .word 6b,2
590

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