1 /* SPDX-License-Identifier: GPL-2.0 */
2 /* copy_user.S: Sparc optimized copy_from_user
3 *
4 * Copyright(C) 1995 Linus Torvalds
5 * Copyright(C) 1996 David S. Miller
6 * Copyright(C) 1996 Eddie C. Dost
7 * Copyright(C) 1996,1998 Jakub Jelinek
8 *
9 * derived from:
10 * e-mail between David and Eddie.
11 *
12 * Returns 0 if successful, otherwise count of
13 */
14
15 #include <linux/export.h>
16 #include <asm/ptrace.h>
17 #include <asm/asmmacro.h>
18 #include <asm/page.h>
19 #include <asm/thread_info.h>
20
21 /* Work around cpp -rob */
22 #define ALLOC #alloc
23 #define EXECINSTR #execinstr
24
25 #define EX_ENTRY(l1, l2)
26 .section __ex_table,ALLOC;
27 .align 4;
28 .word l1, l2;
29 .text;
30
31 #define EX(x,y,a,b)
32 98: x,y;
33 .section .fixup,ALLOC,EXECINSTR;
34 .align 4;
35 99: retl;
36 a, b, %o0;
37 EX_ENTRY(98b, 99b)
38
39 #define EX2(x,y,c,d,e,a,b)
40 98: x,y;
41 .section .fixup,ALLOC,EXECINSTR;
42 .align 4;
43 99: c, d, e;
44 retl;
45 a, b, %o0;
46 EX_ENTRY(98b, 99b)
47
48 #define EXO2(x,y)
49 98: x, y;
50 EX_ENTRY(98b, 97f)
51
52 #define LD(insn, src, offset, reg, label)
53 98: insn [%src + (offset)], %reg;
54 .section .fixup,ALLOC,EXECINSTR;
55 99: ba label;
56 mov offset, %g5;
57 EX_ENTRY(98b, 99b)
58
59 #define ST(insn, dst, offset, reg, label)
60 98: insn %reg, [%dst + (offset)];
61 .section .fixup,ALLOC,EXECINSTR;
62 99: ba label;
63 mov offset, %g5;
64 EX_ENTRY(98b, 99b)
65
66 /* Both these macros have to start with exactl
67 /* left: g7 + (g1 % 128) - offset */
68 #define MOVE_BIGCHUNK(src, dst, offset, t0, t1
69 LD(ldd, src, offset + 0x00, t0, bigchu
70 LD(ldd, src, offset + 0x08, t2, bigchu
71 LD(ldd, src, offset + 0x10, t4, bigchu
72 LD(ldd, src, offset + 0x18, t6, bigchu
73 ST(st, dst, offset + 0x00, t0, bigchun
74 ST(st, dst, offset + 0x04, t1, bigchun
75 ST(st, dst, offset + 0x08, t2, bigchun
76 ST(st, dst, offset + 0x0c, t3, bigchun
77 ST(st, dst, offset + 0x10, t4, bigchun
78 ST(st, dst, offset + 0x14, t5, bigchun
79 ST(st, dst, offset + 0x18, t6, bigchun
80 ST(st, dst, offset + 0x1c, t7, bigchun
81
82 /* left: g7 + (g1 % 128) - offset */
83 #define MOVE_BIGALIGNCHUNK(src, dst, offset, t
84 LD(ldd, src, offset + 0x00, t0, bigchu
85 LD(ldd, src, offset + 0x08, t2, bigchu
86 LD(ldd, src, offset + 0x10, t4, bigchu
87 LD(ldd, src, offset + 0x18, t6, bigchu
88 ST(std, dst, offset + 0x00, t0, bigchu
89 ST(std, dst, offset + 0x08, t2, bigchu
90 ST(std, dst, offset + 0x10, t4, bigchu
91 ST(std, dst, offset + 0x18, t6, bigchu
92
93 .section .fixup,#alloc,#execinstr
94 bigchunk_fault:
95 sub %g7, %g5, %o0
96 and %g1, 127, %g1
97 retl
98 add %o0, %g1, %o0
99
100 /* left: offset + 16 + (g1 % 16) */
101 #define MOVE_LASTCHUNK(src, dst, offset, t0, t
102 LD(ldd, src, -(offset + 0x10), t0, las
103 LD(ldd, src, -(offset + 0x08), t2, las
104 ST(st, dst, -(offset + 0x10), t0, last
105 ST(st, dst, -(offset + 0x0c), t1, last
106 ST(st, dst, -(offset + 0x08), t2, last
107 ST(st, dst, -(offset + 0x04), t3, last
108
109 .section .fixup,#alloc,#execinstr
110 lastchunk_fault:
111 and %g1, 15, %g1
112 retl
113 sub %g1, %g5, %o0
114
115 /* left: o3 + (o2 % 16) - offset */
116 #define MOVE_HALFCHUNK(src, dst, offset, t0, t
117 LD(lduh, src, offset + 0x00, t0, halfc
118 LD(lduh, src, offset + 0x02, t1, halfc
119 LD(lduh, src, offset + 0x04, t2, halfc
120 LD(lduh, src, offset + 0x06, t3, halfc
121 ST(sth, dst, offset + 0x00, t0, halfch
122 ST(sth, dst, offset + 0x02, t1, halfch
123 ST(sth, dst, offset + 0x04, t2, halfch
124 ST(sth, dst, offset + 0x06, t3, halfch
125
126 /* left: o3 + (o2 % 16) + offset + 2 */
127 #define MOVE_SHORTCHUNK(src, dst, offset, t0,
128 LD(ldub, src, -(offset + 0x02), t0, ha
129 LD(ldub, src, -(offset + 0x01), t1, ha
130 ST(stb, dst, -(offset + 0x02), t0, hal
131 ST(stb, dst, -(offset + 0x01), t1, hal
132
133 .section .fixup,#alloc,#execinstr
134 halfchunk_fault:
135 and %o2, 15, %o2
136 sub %o3, %g5, %o3
137 retl
138 add %o2, %o3, %o0
139
140 /* left: offset + 2 + (o2 % 2) */
141 #define MOVE_LAST_SHORTCHUNK(src, dst, offset,
142 LD(ldub, src, -(offset + 0x02), t0, la
143 LD(ldub, src, -(offset + 0x01), t1, la
144 ST(stb, dst, -(offset + 0x02), t0, las
145 ST(stb, dst, -(offset + 0x01), t1, las
146
147 .section .fixup,#alloc,#execinstr
148 last_shortchunk_fault:
149 and %o2, 1, %o2
150 retl
151 sub %o2, %g5, %o0
152
153 .text
154 .align 4
155
156 .globl __copy_user_begin
157 __copy_user_begin:
158
159 .globl __copy_user
160 EXPORT_SYMBOL(__copy_user)
161 dword_align:
162 andcc %o1, 1, %g0
163 be 4f
164 andcc %o1, 2, %g0
165
166 EXO2(ldub [%o1], %g2)
167 add %o1, 1, %o1
168 EXO2(stb %g2, [%o0])
169 sub %o2, 1, %o2
170 bne 3f
171 add %o0, 1, %o0
172
173 EXO2(lduh [%o1], %g2)
174 add %o1, 2, %o1
175 EXO2(sth %g2, [%o0])
176 sub %o2, 2, %o2
177 b 3f
178 add %o0, 2, %o0
179 4:
180 EXO2(lduh [%o1], %g2)
181 add %o1, 2, %o1
182 EXO2(sth %g2, [%o0])
183 sub %o2, 2, %o2
184 b 3f
185 add %o0, 2, %o0
186
187 __copy_user: /* %o0=dst %o1=src %o2=len */
188 xor %o0, %o1, %o4
189 1:
190 andcc %o4, 3, %o5
191 2:
192 bne cannot_optimize
193 cmp %o2, 15
194
195 bleu short_aligned_end
196 andcc %o1, 3, %g0
197
198 bne dword_align
199 3:
200 andcc %o1, 4, %g0
201
202 be 2f
203 mov %o2, %g1
204
205 EXO2(ld [%o1], %o4)
206 sub %g1, 4, %g1
207 EXO2(st %o4, [%o0])
208 add %o1, 4, %o1
209 add %o0, 4, %o0
210 2:
211 andcc %g1, 0xffffff80, %g7
212 be 3f
213 andcc %o0, 4, %g0
214
215 be ldd_std + 4
216 5:
217 MOVE_BIGCHUNK(o1, o0, 0x00, o2, o3, o4
218 MOVE_BIGCHUNK(o1, o0, 0x20, o2, o3, o4
219 MOVE_BIGCHUNK(o1, o0, 0x40, o2, o3, o4
220 MOVE_BIGCHUNK(o1, o0, 0x60, o2, o3, o4
221 subcc %g7, 128, %g7
222 add %o1, 128, %o1
223 bne 5b
224 add %o0, 128, %o0
225 3:
226 andcc %g1, 0x70, %g7
227 be copy_user_table_end
228 andcc %g1, 8, %g0
229
230 sethi %hi(copy_user_table_end), %o5
231 srl %g7, 1, %o4
232 add %g7, %o4, %o4
233 add %o1, %g7, %o1
234 sub %o5, %o4, %o5
235 jmpl %o5 + %lo(copy_user_table_end)
236 add %o0, %g7, %o0
237
238 MOVE_LASTCHUNK(o1, o0, 0x60, g2, g3, g
239 MOVE_LASTCHUNK(o1, o0, 0x50, g2, g3, g
240 MOVE_LASTCHUNK(o1, o0, 0x40, g2, g3, g
241 MOVE_LASTCHUNK(o1, o0, 0x30, g2, g3, g
242 MOVE_LASTCHUNK(o1, o0, 0x20, g2, g3, g
243 MOVE_LASTCHUNK(o1, o0, 0x10, g2, g3, g
244 MOVE_LASTCHUNK(o1, o0, 0x00, g2, g3, g
245 copy_user_table_end:
246 be copy_user_last7
247 andcc %g1, 4, %g0
248
249 EX(ldd [%o1], %g2, and %g1, 0xf)
250 add %o0, 8, %o0
251 add %o1, 8, %o1
252 EX(st %g2, [%o0 - 0x08], and %g1, 0x
253 EX2(st %g3, [%o0 - 0x04], and %g1, 0x
254 copy_user_last7:
255 be 1f
256 andcc %g1, 2, %g0
257
258 EX(ld [%o1], %g2, and %g1, 7)
259 add %o1, 4, %o1
260 EX(st %g2, [%o0], and %g1, 7)
261 add %o0, 4, %o0
262 1:
263 be 1f
264 andcc %g1, 1, %g0
265
266 EX(lduh [%o1], %g2, and %g1, 3)
267 add %o1, 2, %o1
268 EX(sth %g2, [%o0], and %g1, 3)
269 add %o0, 2, %o0
270 1:
271 be 1f
272 nop
273
274 EX(ldub [%o1], %g2, add %g0, 1)
275 EX(stb %g2, [%o0], add %g0, 1)
276 1:
277 retl
278 clr %o0
279
280 ldd_std:
281 MOVE_BIGALIGNCHUNK(o1, o0, 0x00, o2, o
282 MOVE_BIGALIGNCHUNK(o1, o0, 0x20, o2, o
283 MOVE_BIGALIGNCHUNK(o1, o0, 0x40, o2, o
284 MOVE_BIGALIGNCHUNK(o1, o0, 0x60, o2, o
285 subcc %g7, 128, %g7
286 add %o1, 128, %o1
287 bne ldd_std
288 add %o0, 128, %o0
289
290 andcc %g1, 0x70, %g7
291 be copy_user_table_end
292 andcc %g1, 8, %g0
293
294 sethi %hi(copy_user_table_end), %o5
295 srl %g7, 1, %o4
296 add %g7, %o4, %o4
297 add %o1, %g7, %o1
298 sub %o5, %o4, %o5
299 jmpl %o5 + %lo(copy_user_table_end)
300 add %o0, %g7, %o0
301
302 cannot_optimize:
303 bleu short_end
304 cmp %o5, 2
305
306 bne byte_chunk
307 and %o2, 0xfffffff0, %o3
308
309 andcc %o1, 1, %g0
310 be 10f
311 nop
312
313 EXO2(ldub [%o1], %g2)
314 add %o1, 1, %o1
315 EXO2(stb %g2, [%o0])
316 sub %o2, 1, %o2
317 andcc %o2, 0xfffffff0, %o3
318 be short_end
319 add %o0, 1, %o0
320 10:
321 MOVE_HALFCHUNK(o1, o0, 0x00, g2, g3, g
322 MOVE_HALFCHUNK(o1, o0, 0x08, g2, g3, g
323 subcc %o3, 0x10, %o3
324 add %o1, 0x10, %o1
325 bne 10b
326 add %o0, 0x10, %o0
327 b 2f
328 and %o2, 0xe, %o3
329
330 byte_chunk:
331 MOVE_SHORTCHUNK(o1, o0, -0x02, g2, g3)
332 MOVE_SHORTCHUNK(o1, o0, -0x04, g2, g3)
333 MOVE_SHORTCHUNK(o1, o0, -0x06, g2, g3)
334 MOVE_SHORTCHUNK(o1, o0, -0x08, g2, g3)
335 MOVE_SHORTCHUNK(o1, o0, -0x0a, g2, g3)
336 MOVE_SHORTCHUNK(o1, o0, -0x0c, g2, g3)
337 MOVE_SHORTCHUNK(o1, o0, -0x0e, g2, g3)
338 MOVE_SHORTCHUNK(o1, o0, -0x10, g2, g3)
339 subcc %o3, 0x10, %o3
340 add %o1, 0x10, %o1
341 bne byte_chunk
342 add %o0, 0x10, %o0
343
344 short_end:
345 and %o2, 0xe, %o3
346 2:
347 sethi %hi(short_table_end), %o5
348 sll %o3, 3, %o4
349 add %o0, %o3, %o0
350 sub %o5, %o4, %o5
351 add %o1, %o3, %o1
352 jmpl %o5 + %lo(short_table_end), %g
353 andcc %o2, 1, %g0
354 MOVE_LAST_SHORTCHUNK(o1, o0, 0x0c, g2,
355 MOVE_LAST_SHORTCHUNK(o1, o0, 0x0a, g2,
356 MOVE_LAST_SHORTCHUNK(o1, o0, 0x08, g2,
357 MOVE_LAST_SHORTCHUNK(o1, o0, 0x06, g2,
358 MOVE_LAST_SHORTCHUNK(o1, o0, 0x04, g2,
359 MOVE_LAST_SHORTCHUNK(o1, o0, 0x02, g2,
360 MOVE_LAST_SHORTCHUNK(o1, o0, 0x00, g2,
361 short_table_end:
362 be 1f
363 nop
364 EX(ldub [%o1], %g2, add %g0, 1)
365 EX(stb %g2, [%o0], add %g0, 1)
366 1:
367 retl
368 clr %o0
369
370 short_aligned_end:
371 bne short_end
372 andcc %o2, 8, %g0
373
374 be 1f
375 andcc %o2, 4, %g0
376
377 EXO2(ld [%o1 + 0x00], %g2)
378 EXO2(ld [%o1 + 0x04], %g3)
379 add %o1, 8, %o1
380 EXO2(st %g2, [%o0 + 0x00])
381 EX(st %g3, [%o0 + 0x04], sub %o2, 4)
382 add %o0, 8, %o0
383 1:
384 b copy_user_last7
385 mov %o2, %g1
386
387 .section .fixup,#alloc,#execinstr
388 .align 4
389 97:
390 retl
391 mov %o2, %o0
392
393 .globl __copy_user_end
394 __copy_user_end:
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