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4b565680 TY |
1 | /* |
2 | * arch/sh/math-emu/math.c | |
3 | * | |
4 | * Copyright (C) 2006 Takashi YOSHII <takasi-y@ops.dti.ne.jp> | |
5 | * | |
6 | * This file is subject to the terms and conditions of the GNU General Public | |
7 | * License. See the file "COPYING" in the main directory of this archive | |
8 | * for more details. | |
9 | */ | |
4b565680 TY |
10 | #include <linux/kernel.h> |
11 | #include <linux/errno.h> | |
12 | #include <linux/types.h> | |
13 | #include <linux/sched.h> | |
14 | #include <linux/signal.h> | |
15 | ||
16 | #include <asm/system.h> | |
17 | #include <asm/uaccess.h> | |
18 | #include <asm/processor.h> | |
19 | #include <asm/io.h> | |
20 | ||
21 | #include "sfp-util.h" | |
22 | #include <math-emu/soft-fp.h> | |
23 | #include <math-emu/single.h> | |
24 | #include <math-emu/double.h> | |
25 | ||
26 | #define FPUL (fregs->fpul) | |
27 | #define FPSCR (fregs->fpscr) | |
28 | #define FPSCR_RM (FPSCR&3) | |
29 | #define FPSCR_DN ((FPSCR>>18)&1) | |
30 | #define FPSCR_PR ((FPSCR>>19)&1) | |
31 | #define FPSCR_SZ ((FPSCR>>20)&1) | |
32 | #define FPSCR_FR ((FPSCR>>21)&1) | |
33 | #define FPSCR_MASK 0x003fffffUL | |
34 | ||
35 | #define BANK(n) (n^(FPSCR_FR?16:0)) | |
36 | #define FR ((unsigned long*)(fregs->fp_regs)) | |
37 | #define FR0 (FR[BANK(0)]) | |
38 | #define FRn (FR[BANK(n)]) | |
39 | #define FRm (FR[BANK(m)]) | |
40 | #define DR ((unsigned long long*)(fregs->fp_regs)) | |
41 | #define DRn (DR[BANK(n)/2]) | |
42 | #define DRm (DR[BANK(m)/2]) | |
43 | ||
44 | #define XREG(n) (n^16) | |
45 | #define XFn (FR[BANK(XREG(n))]) | |
46 | #define XFm (FR[BANK(XREG(m))]) | |
47 | #define XDn (DR[BANK(XREG(n))/2]) | |
48 | #define XDm (DR[BANK(XREG(m))/2]) | |
49 | ||
50 | #define R0 (regs->regs[0]) | |
51 | #define Rn (regs->regs[n]) | |
52 | #define Rm (regs->regs[m]) | |
53 | ||
54 | #define WRITE(d,a) ({if(put_user(d, (typeof (d)*)a)) return -EFAULT;}) | |
55 | #define READ(d,a) ({if(get_user(d, (typeof (d)*)a)) return -EFAULT;}) | |
56 | ||
57 | #define PACK_S(r,f) FP_PACK_SP(&r,f) | |
58 | #define UNPACK_S(f,r) FP_UNPACK_SP(f,&r) | |
59 | #define PACK_D(r,f) \ | |
60 | {u32 t[2]; FP_PACK_DP(t,f); ((u32*)&r)[0]=t[1]; ((u32*)&r)[1]=t[0];} | |
61 | #define UNPACK_D(f,r) \ | |
62 | {u32 t[2]; t[0]=((u32*)&r)[1]; t[1]=((u32*)&r)[0]; FP_UNPACK_DP(f,t);} | |
63 | ||
64 | // 2 args instructions. | |
65 | #define BOTH_PRmn(op,x) \ | |
66 | FP_DECL_EX; if(FPSCR_PR) op(D,x,DRm,DRn); else op(S,x,FRm,FRn); | |
67 | ||
68 | #define CMP_X(SZ,R,M,N) do{ \ | |
69 | FP_DECL_##SZ(Fm); FP_DECL_##SZ(Fn); \ | |
70 | UNPACK_##SZ(Fm, M); UNPACK_##SZ(Fn, N); \ | |
71 | FP_CMP_##SZ(R, Fn, Fm, 2); }while(0) | |
72 | #define EQ_X(SZ,R,M,N) do{ \ | |
73 | FP_DECL_##SZ(Fm); FP_DECL_##SZ(Fn); \ | |
74 | UNPACK_##SZ(Fm, M); UNPACK_##SZ(Fn, N); \ | |
75 | FP_CMP_EQ_##SZ(R, Fn, Fm); }while(0) | |
76 | #define CMP(OP) ({ int r; BOTH_PRmn(OP##_X,r); r; }) | |
77 | ||
78 | static int | |
79 | fcmp_gt(struct sh_fpu_soft_struct *fregs, struct pt_regs *regs, int m, int n) | |
80 | { | |
81 | if (CMP(CMP) > 0) | |
82 | regs->sr |= 1; | |
83 | else | |
84 | regs->sr &= ~1; | |
85 | ||
86 | return 0; | |
87 | } | |
88 | ||
89 | static int | |
90 | fcmp_eq(struct sh_fpu_soft_struct *fregs, struct pt_regs *regs, int m, int n) | |
91 | { | |
92 | if (CMP(CMP /*EQ*/) == 0) | |
93 | regs->sr |= 1; | |
94 | else | |
95 | regs->sr &= ~1; | |
96 | return 0; | |
97 | } | |
98 | ||
99 | #define ARITH_X(SZ,OP,M,N) do{ \ | |
100 | FP_DECL_##SZ(Fm); FP_DECL_##SZ(Fn); FP_DECL_##SZ(Fr); \ | |
101 | UNPACK_##SZ(Fm, M); UNPACK_##SZ(Fn, N); \ | |
102 | FP_##OP##_##SZ(Fr, Fn, Fm); \ | |
103 | PACK_##SZ(N, Fr); }while(0) | |
104 | ||
105 | static int | |
106 | fadd(struct sh_fpu_soft_struct *fregs, struct pt_regs *regs, int m, int n) | |
107 | { | |
108 | BOTH_PRmn(ARITH_X, ADD); | |
109 | return 0; | |
110 | } | |
111 | ||
112 | static int | |
113 | fsub(struct sh_fpu_soft_struct *fregs, struct pt_regs *regs, int m, int n) | |
114 | { | |
115 | BOTH_PRmn(ARITH_X, SUB); | |
116 | return 0; | |
117 | } | |
118 | ||
119 | static int | |
120 | fmul(struct sh_fpu_soft_struct *fregs, struct pt_regs *regs, int m, int n) | |
121 | { | |
122 | BOTH_PRmn(ARITH_X, MUL); | |
123 | return 0; | |
124 | } | |
125 | ||
126 | static int | |
127 | fdiv(struct sh_fpu_soft_struct *fregs, struct pt_regs *regs, int m, int n) | |
128 | { | |
129 | BOTH_PRmn(ARITH_X, DIV); | |
130 | return 0; | |
131 | } | |
132 | ||
133 | static int | |
134 | fmac(struct sh_fpu_soft_struct *fregs, struct pt_regs *regs, int m, int n) | |
135 | { | |
136 | FP_DECL_EX; | |
137 | FP_DECL_S(Fr); | |
138 | FP_DECL_S(Ft); | |
139 | FP_DECL_S(F0); | |
140 | FP_DECL_S(Fm); | |
141 | FP_DECL_S(Fn); | |
142 | UNPACK_S(F0, FR0); | |
143 | UNPACK_S(Fm, FRm); | |
144 | UNPACK_S(Fn, FRn); | |
145 | FP_MUL_S(Ft, Fm, F0); | |
146 | FP_ADD_S(Fr, Fn, Ft); | |
147 | PACK_S(FRn, Fr); | |
148 | return 0; | |
149 | } | |
150 | ||
e868d612 | 151 | // to process fmov's extension (odd n for DR access XD). |
4b565680 TY |
152 | #define FMOV_EXT(x) if(x&1) x+=16-1 |
153 | ||
154 | static int | |
155 | fmov_idx_reg(struct sh_fpu_soft_struct *fregs, struct pt_regs *regs, int m, | |
156 | int n) | |
157 | { | |
158 | if (FPSCR_SZ) { | |
159 | FMOV_EXT(n); | |
160 | READ(FRn, Rm + R0 + 4); | |
161 | n++; | |
162 | READ(FRn, Rm + R0); | |
163 | } else { | |
164 | READ(FRn, Rm + R0); | |
165 | } | |
166 | ||
167 | return 0; | |
168 | } | |
169 | ||
170 | static int | |
171 | fmov_mem_reg(struct sh_fpu_soft_struct *fregs, struct pt_regs *regs, int m, | |
172 | int n) | |
173 | { | |
174 | if (FPSCR_SZ) { | |
175 | FMOV_EXT(n); | |
176 | READ(FRn, Rm + 4); | |
177 | n++; | |
178 | READ(FRn, Rm); | |
179 | } else { | |
180 | READ(FRn, Rm); | |
181 | } | |
182 | ||
183 | return 0; | |
184 | } | |
185 | ||
186 | static int | |
187 | fmov_inc_reg(struct sh_fpu_soft_struct *fregs, struct pt_regs *regs, int m, | |
188 | int n) | |
189 | { | |
190 | if (FPSCR_SZ) { | |
191 | FMOV_EXT(n); | |
192 | READ(FRn, Rm + 4); | |
193 | n++; | |
194 | READ(FRn, Rm); | |
195 | Rm += 8; | |
196 | } else { | |
197 | READ(FRn, Rm); | |
198 | Rm += 4; | |
199 | } | |
200 | ||
201 | return 0; | |
202 | } | |
203 | ||
204 | static int | |
205 | fmov_reg_idx(struct sh_fpu_soft_struct *fregs, struct pt_regs *regs, int m, | |
206 | int n) | |
207 | { | |
208 | if (FPSCR_SZ) { | |
209 | FMOV_EXT(m); | |
210 | WRITE(FRm, Rn + R0 + 4); | |
211 | m++; | |
212 | WRITE(FRm, Rn + R0); | |
213 | } else { | |
214 | WRITE(FRm, Rn + R0); | |
215 | } | |
216 | ||
217 | return 0; | |
218 | } | |
219 | ||
220 | static int | |
221 | fmov_reg_mem(struct sh_fpu_soft_struct *fregs, struct pt_regs *regs, int m, | |
222 | int n) | |
223 | { | |
224 | if (FPSCR_SZ) { | |
225 | FMOV_EXT(m); | |
226 | WRITE(FRm, Rn + 4); | |
227 | m++; | |
228 | WRITE(FRm, Rn); | |
229 | } else { | |
230 | WRITE(FRm, Rn); | |
231 | } | |
232 | ||
233 | return 0; | |
234 | } | |
235 | ||
236 | static int | |
237 | fmov_reg_dec(struct sh_fpu_soft_struct *fregs, struct pt_regs *regs, int m, | |
238 | int n) | |
239 | { | |
240 | if (FPSCR_SZ) { | |
241 | FMOV_EXT(m); | |
242 | Rn -= 8; | |
243 | WRITE(FRm, Rn + 4); | |
244 | m++; | |
245 | WRITE(FRm, Rn); | |
246 | } else { | |
247 | Rn -= 4; | |
248 | WRITE(FRm, Rn); | |
249 | } | |
250 | ||
251 | return 0; | |
252 | } | |
253 | ||
254 | static int | |
255 | fmov_reg_reg(struct sh_fpu_soft_struct *fregs, struct pt_regs *regs, int m, | |
256 | int n) | |
257 | { | |
258 | if (FPSCR_SZ) { | |
259 | FMOV_EXT(m); | |
260 | FMOV_EXT(n); | |
261 | DRn = DRm; | |
262 | } else { | |
263 | FRn = FRm; | |
264 | } | |
265 | ||
266 | return 0; | |
267 | } | |
268 | ||
269 | static int | |
270 | fnop_mn(struct sh_fpu_soft_struct *fregs, struct pt_regs *regs, int m, int n) | |
271 | { | |
272 | return -EINVAL; | |
273 | } | |
274 | ||
275 | // 1 arg instructions. | |
276 | #define NOTYETn(i) static int i(struct sh_fpu_soft_struct *fregs, int n) \ | |
277 | { printk( #i " not yet done.\n"); return 0; } | |
278 | ||
279 | NOTYETn(ftrv) | |
280 | NOTYETn(fsqrt) | |
281 | NOTYETn(fipr) | |
282 | NOTYETn(fsca) | |
283 | NOTYETn(fsrra) | |
284 | ||
285 | #define EMU_FLOAT_X(SZ,N) do { \ | |
286 | FP_DECL_##SZ(Fn); \ | |
287 | FP_FROM_INT_##SZ(Fn, FPUL, 32, int); \ | |
288 | PACK_##SZ(N, Fn); }while(0) | |
289 | static int ffloat(struct sh_fpu_soft_struct *fregs, int n) | |
290 | { | |
291 | FP_DECL_EX; | |
292 | ||
293 | if (FPSCR_PR) | |
294 | EMU_FLOAT_X(D, DRn); | |
295 | else | |
296 | EMU_FLOAT_X(S, FRn); | |
297 | ||
298 | return 0; | |
299 | } | |
300 | ||
301 | #define EMU_FTRC_X(SZ,N) do { \ | |
302 | FP_DECL_##SZ(Fn); \ | |
303 | UNPACK_##SZ(Fn, N); \ | |
304 | FP_TO_INT_##SZ(FPUL, Fn, 32, 1); }while(0) | |
305 | static int ftrc(struct sh_fpu_soft_struct *fregs, int n) | |
306 | { | |
307 | FP_DECL_EX; | |
308 | ||
309 | if (FPSCR_PR) | |
310 | EMU_FTRC_X(D, DRn); | |
311 | else | |
312 | EMU_FTRC_X(S, FRn); | |
313 | ||
314 | return 0; | |
315 | } | |
316 | ||
317 | static int fcnvsd(struct sh_fpu_soft_struct *fregs, int n) | |
318 | { | |
319 | FP_DECL_EX; | |
320 | FP_DECL_S(Fn); | |
321 | FP_DECL_D(Fr); | |
322 | UNPACK_S(Fn, FPUL); | |
323 | FP_CONV(D, S, 2, 1, Fr, Fn); | |
324 | PACK_D(DRn, Fr); | |
325 | return 0; | |
326 | } | |
327 | ||
328 | static int fcnvds(struct sh_fpu_soft_struct *fregs, int n) | |
329 | { | |
330 | FP_DECL_EX; | |
331 | FP_DECL_D(Fn); | |
332 | FP_DECL_S(Fr); | |
333 | UNPACK_D(Fn, DRn); | |
334 | FP_CONV(S, D, 1, 2, Fr, Fn); | |
335 | PACK_S(FPUL, Fr); | |
336 | return 0; | |
337 | } | |
338 | ||
339 | static int fxchg(struct sh_fpu_soft_struct *fregs, int flag) | |
340 | { | |
341 | FPSCR ^= flag; | |
342 | return 0; | |
343 | } | |
344 | ||
345 | static int fsts(struct sh_fpu_soft_struct *fregs, int n) | |
346 | { | |
347 | FRn = FPUL; | |
348 | return 0; | |
349 | } | |
350 | ||
351 | static int flds(struct sh_fpu_soft_struct *fregs, int n) | |
352 | { | |
353 | FPUL = FRn; | |
354 | return 0; | |
355 | } | |
356 | ||
357 | static int fneg(struct sh_fpu_soft_struct *fregs, int n) | |
358 | { | |
359 | FRn ^= (1 << (_FP_W_TYPE_SIZE - 1)); | |
360 | return 0; | |
361 | } | |
362 | ||
363 | static int fabs(struct sh_fpu_soft_struct *fregs, int n) | |
364 | { | |
365 | FRn &= ~(1 << (_FP_W_TYPE_SIZE - 1)); | |
366 | return 0; | |
367 | } | |
368 | ||
369 | static int fld0(struct sh_fpu_soft_struct *fregs, int n) | |
370 | { | |
371 | FRn = 0; | |
372 | return 0; | |
373 | } | |
374 | ||
375 | static int fld1(struct sh_fpu_soft_struct *fregs, int n) | |
376 | { | |
377 | FRn = (_FP_EXPBIAS_S << (_FP_FRACBITS_S - 1)); | |
378 | return 0; | |
379 | } | |
380 | ||
381 | static int fnop_n(struct sh_fpu_soft_struct *fregs, int n) | |
382 | { | |
383 | return -EINVAL; | |
384 | } | |
385 | ||
386 | /// Instruction decoders. | |
387 | ||
388 | static int id_fxfd(struct sh_fpu_soft_struct *, int); | |
389 | static int id_fnxd(struct sh_fpu_soft_struct *, struct pt_regs *, int, int); | |
390 | ||
391 | static int (*fnxd[])(struct sh_fpu_soft_struct *, int) = { | |
392 | fsts, flds, ffloat, ftrc, fneg, fabs, fsqrt, fsrra, | |
393 | fld0, fld1, fcnvsd, fcnvds, fnop_n, fnop_n, fipr, id_fxfd | |
394 | }; | |
395 | ||
396 | static int (*fnmx[])(struct sh_fpu_soft_struct *, struct pt_regs *, int, int) = { | |
397 | fadd, fsub, fmul, fdiv, fcmp_eq, fcmp_gt, fmov_idx_reg, fmov_reg_idx, | |
398 | fmov_mem_reg, fmov_inc_reg, fmov_reg_mem, fmov_reg_dec, | |
399 | fmov_reg_reg, id_fnxd, fmac, fnop_mn}; | |
400 | ||
401 | static int id_fxfd(struct sh_fpu_soft_struct *fregs, int x) | |
402 | { | |
403 | const int flag[] = { FPSCR_SZ, FPSCR_PR, FPSCR_FR, 0 }; | |
404 | switch (x & 3) { | |
405 | case 3: | |
406 | fxchg(fregs, flag[x >> 2]); | |
407 | break; | |
408 | case 1: | |
409 | ftrv(fregs, x - 1); | |
410 | break; | |
411 | default: | |
412 | fsca(fregs, x); | |
413 | } | |
414 | return 0; | |
415 | } | |
416 | ||
417 | static int | |
418 | id_fnxd(struct sh_fpu_soft_struct *fregs, struct pt_regs *regs, int x, int n) | |
419 | { | |
420 | return (fnxd[x])(fregs, n); | |
421 | } | |
422 | ||
423 | static int | |
424 | id_fnmx(struct sh_fpu_soft_struct *fregs, struct pt_regs *regs, u16 code) | |
425 | { | |
426 | int n = (code >> 8) & 0xf, m = (code >> 4) & 0xf, x = code & 0xf; | |
427 | return (fnmx[x])(fregs, regs, m, n); | |
428 | } | |
429 | ||
430 | static int | |
431 | id_sys(struct sh_fpu_soft_struct *fregs, struct pt_regs *regs, u16 code) | |
432 | { | |
433 | int n = ((code >> 8) & 0xf); | |
434 | unsigned long *reg = (code & 0x0010) ? &FPUL : &FPSCR; | |
435 | ||
436 | switch (code & 0xf0ff) { | |
437 | case 0x005a: | |
438 | case 0x006a: | |
439 | Rn = *reg; | |
440 | break; | |
441 | case 0x405a: | |
442 | case 0x406a: | |
443 | *reg = Rn; | |
444 | break; | |
445 | case 0x4052: | |
446 | case 0x4062: | |
447 | Rn -= 4; | |
448 | WRITE(*reg, Rn); | |
449 | break; | |
450 | case 0x4056: | |
451 | case 0x4066: | |
452 | READ(*reg, Rn); | |
453 | Rn += 4; | |
454 | break; | |
455 | default: | |
456 | return -EINVAL; | |
457 | } | |
458 | ||
459 | return 0; | |
460 | } | |
461 | ||
462 | static int fpu_emulate(u16 code, struct sh_fpu_soft_struct *fregs, struct pt_regs *regs) | |
463 | { | |
464 | if ((code & 0xf000) == 0xf000) | |
465 | return id_fnmx(fregs, regs, code); | |
466 | else | |
467 | return id_sys(fregs, regs, code); | |
468 | } | |
469 | ||
470 | /** | |
471 | * denormal_to_double - Given denormalized float number, | |
472 | * store double float | |
473 | * | |
474 | * @fpu: Pointer to sh_fpu_hard structure | |
475 | * @n: Index to FP register | |
476 | */ | |
477 | static void denormal_to_double(struct sh_fpu_hard_struct *fpu, int n) | |
478 | { | |
479 | unsigned long du, dl; | |
480 | unsigned long x = fpu->fpul; | |
481 | int exp = 1023 - 126; | |
482 | ||
483 | if (x != 0 && (x & 0x7f800000) == 0) { | |
484 | du = (x & 0x80000000); | |
485 | while ((x & 0x00800000) == 0) { | |
486 | x <<= 1; | |
487 | exp--; | |
488 | } | |
489 | x &= 0x007fffff; | |
490 | du |= (exp << 20) | (x >> 3); | |
491 | dl = x << 29; | |
492 | ||
493 | fpu->fp_regs[n] = du; | |
494 | fpu->fp_regs[n+1] = dl; | |
495 | } | |
496 | } | |
497 | ||
498 | /** | |
499 | * ieee_fpe_handler - Handle denormalized number exception | |
500 | * | |
501 | * @regs: Pointer to register structure | |
502 | * | |
503 | * Returns 1 when it's handled (should not cause exception). | |
504 | */ | |
505 | static int ieee_fpe_handler(struct pt_regs *regs) | |
506 | { | |
507 | unsigned short insn = *(unsigned short *)regs->pc; | |
508 | unsigned short finsn; | |
509 | unsigned long nextpc; | |
d3efbdd6 | 510 | siginfo_t info; |
4b565680 TY |
511 | int nib[4] = { |
512 | (insn >> 12) & 0xf, | |
513 | (insn >> 8) & 0xf, | |
514 | (insn >> 4) & 0xf, | |
515 | insn & 0xf}; | |
516 | ||
517 | if (nib[0] == 0xb || | |
518 | (nib[0] == 0x4 && nib[2] == 0x0 && nib[3] == 0xb)) /* bsr & jsr */ | |
519 | regs->pr = regs->pc + 4; | |
520 | ||
521 | if (nib[0] == 0xa || nib[0] == 0xb) { /* bra & bsr */ | |
522 | nextpc = regs->pc + 4 + ((short) ((insn & 0xfff) << 4) >> 3); | |
523 | finsn = *(unsigned short *) (regs->pc + 2); | |
524 | } else if (nib[0] == 0x8 && nib[1] == 0xd) { /* bt/s */ | |
525 | if (regs->sr & 1) | |
526 | nextpc = regs->pc + 4 + ((char) (insn & 0xff) << 1); | |
527 | else | |
528 | nextpc = regs->pc + 4; | |
529 | finsn = *(unsigned short *) (regs->pc + 2); | |
530 | } else if (nib[0] == 0x8 && nib[1] == 0xf) { /* bf/s */ | |
531 | if (regs->sr & 1) | |
532 | nextpc = regs->pc + 4; | |
533 | else | |
534 | nextpc = regs->pc + 4 + ((char) (insn & 0xff) << 1); | |
535 | finsn = *(unsigned short *) (regs->pc + 2); | |
536 | } else if (nib[0] == 0x4 && nib[3] == 0xb && | |
537 | (nib[2] == 0x0 || nib[2] == 0x2)) { /* jmp & jsr */ | |
538 | nextpc = regs->regs[nib[1]]; | |
539 | finsn = *(unsigned short *) (regs->pc + 2); | |
540 | } else if (nib[0] == 0x0 && nib[3] == 0x3 && | |
541 | (nib[2] == 0x0 || nib[2] == 0x2)) { /* braf & bsrf */ | |
542 | nextpc = regs->pc + 4 + regs->regs[nib[1]]; | |
543 | finsn = *(unsigned short *) (regs->pc + 2); | |
544 | } else if (insn == 0x000b) { /* rts */ | |
545 | nextpc = regs->pr; | |
546 | finsn = *(unsigned short *) (regs->pc + 2); | |
547 | } else { | |
548 | nextpc = regs->pc + 2; | |
549 | finsn = insn; | |
550 | } | |
551 | ||
552 | if ((finsn & 0xf1ff) == 0xf0ad) { /* fcnvsd */ | |
553 | struct task_struct *tsk = current; | |
554 | ||
555 | if ((tsk->thread.fpu.hard.fpscr & (1 << 17))) { | |
556 | /* FPU error */ | |
557 | denormal_to_double (&tsk->thread.fpu.hard, | |
558 | (finsn >> 8) & 0xf); | |
559 | tsk->thread.fpu.hard.fpscr &= | |
560 | ~(FPSCR_CAUSE_MASK | FPSCR_FLAG_MASK); | |
561 | set_tsk_thread_flag(tsk, TIF_USEDFPU); | |
562 | } else { | |
d3efbdd6 PM |
563 | info.si_signo = SIGFPE; |
564 | info.si_errno = 0; | |
565 | info.si_code = FPE_FLTINV; | |
566 | info.si_addr = (void __user *)regs->pc; | |
567 | force_sig_info(SIGFPE, &info, tsk); | |
4b565680 TY |
568 | } |
569 | ||
570 | regs->pc = nextpc; | |
571 | return 1; | |
572 | } | |
573 | ||
574 | return 0; | |
575 | } | |
576 | ||
577 | asmlinkage void do_fpu_error(unsigned long r4, unsigned long r5, | |
578 | unsigned long r6, unsigned long r7, | |
579 | struct pt_regs regs) | |
580 | { | |
581 | struct task_struct *tsk = current; | |
d3efbdd6 | 582 | siginfo_t info; |
4b565680 TY |
583 | |
584 | if (ieee_fpe_handler (®s)) | |
585 | return; | |
586 | ||
587 | regs.pc += 2; | |
d3efbdd6 PM |
588 | info.si_signo = SIGFPE; |
589 | info.si_errno = 0; | |
590 | info.si_code = FPE_FLTINV; | |
591 | info.si_addr = (void __user *)regs.pc; | |
592 | force_sig_info(SIGFPE, &info, tsk); | |
4b565680 TY |
593 | } |
594 | ||
595 | /** | |
596 | * fpu_init - Initialize FPU registers | |
597 | * @fpu: Pointer to software emulated FPU registers. | |
598 | */ | |
599 | static void fpu_init(struct sh_fpu_soft_struct *fpu) | |
600 | { | |
601 | int i; | |
602 | ||
603 | fpu->fpscr = FPSCR_INIT; | |
604 | fpu->fpul = 0; | |
605 | ||
606 | for (i = 0; i < 16; i++) { | |
607 | fpu->fp_regs[i] = 0; | |
608 | fpu->xfp_regs[i]= 0; | |
609 | } | |
610 | } | |
611 | ||
612 | /** | |
613 | * do_fpu_inst - Handle reserved instructions for FPU emulation | |
614 | * @inst: instruction code. | |
615 | * @regs: registers on stack. | |
616 | */ | |
617 | int do_fpu_inst(unsigned short inst, struct pt_regs *regs) | |
618 | { | |
619 | struct task_struct *tsk = current; | |
620 | struct sh_fpu_soft_struct *fpu = &(tsk->thread.fpu.soft); | |
621 | ||
622 | if (!test_tsk_thread_flag(tsk, TIF_USEDFPU)) { | |
623 | /* initialize once. */ | |
624 | fpu_init(fpu); | |
625 | set_tsk_thread_flag(tsk, TIF_USEDFPU); | |
626 | } | |
627 | ||
628 | return fpu_emulate(inst, fpu, regs); | |
629 | } |