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[linux-2.6/next.git] / arch / powerpc / math-emu / math.c
blob164d55935bd82ce7903d0e6717ad2cc029d422bf
1 /*
2 * Copyright (C) 1999 Eddie C. Dost (ecd@atecom.com)
3 */
4
5 #include <linux/types.h>
6 #include <linux/sched.h>
7
8 #include <asm/uaccess.h>
9 #include <asm/reg.h>
10
11 #include <asm/sfp-machine.h>
12 #include <math-emu/double.h>
13
14 #define FLOATFUNC(x) extern int x(void *, void *, void *, void *)
15
16 FLOATFUNC(fadd);
17 FLOATFUNC(fadds);
18 FLOATFUNC(fdiv);
19 FLOATFUNC(fdivs);
20 FLOATFUNC(fmul);
21 FLOATFUNC(fmuls);
22 FLOATFUNC(fsub);
23 FLOATFUNC(fsubs);
24
25 FLOATFUNC(fmadd);
26 FLOATFUNC(fmadds);
27 FLOATFUNC(fmsub);
28 FLOATFUNC(fmsubs);
29 FLOATFUNC(fnmadd);
30 FLOATFUNC(fnmadds);
31 FLOATFUNC(fnmsub);
32 FLOATFUNC(fnmsubs);
33
34 FLOATFUNC(fctiw);
35 FLOATFUNC(fctiwz);
36 FLOATFUNC(frsp);
37
38 FLOATFUNC(fcmpo);
39 FLOATFUNC(fcmpu);
40
41 FLOATFUNC(mcrfs);
42 FLOATFUNC(mffs);
43 FLOATFUNC(mtfsb0);
44 FLOATFUNC(mtfsb1);
45 FLOATFUNC(mtfsf);
46 FLOATFUNC(mtfsfi);
47
48 FLOATFUNC(lfd);
49 FLOATFUNC(lfs);
50
51 FLOATFUNC(stfd);
52 FLOATFUNC(stfs);
53 FLOATFUNC(stfiwx);
54
55 FLOATFUNC(fabs);
56 FLOATFUNC(fmr);
57 FLOATFUNC(fnabs);
58 FLOATFUNC(fneg);
59
60 /* Optional */
61 FLOATFUNC(fres);
62 FLOATFUNC(frsqrte);
63 FLOATFUNC(fsel);
64 FLOATFUNC(fsqrt);
65 FLOATFUNC(fsqrts);
66
67
68 #define OP31 0x1f /* 31 */
69 #define LFS 0x30 /* 48 */
70 #define LFSU 0x31 /* 49 */
71 #define LFD 0x32 /* 50 */
72 #define LFDU 0x33 /* 51 */
73 #define STFS 0x34 /* 52 */
74 #define STFSU 0x35 /* 53 */
75 #define STFD 0x36 /* 54 */
76 #define STFDU 0x37 /* 55 */
77 #define OP59 0x3b /* 59 */
78 #define OP63 0x3f /* 63 */
79
80 /* Opcode 31: */
81 /* X-Form: */
82 #define LFSX 0x217 /* 535 */
83 #define LFSUX 0x237 /* 567 */
84 #define LFDX 0x257 /* 599 */
85 #define LFDUX 0x277 /* 631 */
86 #define STFSX 0x297 /* 663 */
87 #define STFSUX 0x2b7 /* 695 */
88 #define STFDX 0x2d7 /* 727 */
89 #define STFDUX 0x2f7 /* 759 */
90 #define STFIWX 0x3d7 /* 983 */
91
92 /* Opcode 59: */
93 /* A-Form: */
94 #define FDIVS 0x012 /* 18 */
95 #define FSUBS 0x014 /* 20 */
96 #define FADDS 0x015 /* 21 */
97 #define FSQRTS 0x016 /* 22 */
98 #define FRES 0x018 /* 24 */
99 #define FMULS 0x019 /* 25 */
100 #define FMSUBS 0x01c /* 28 */
101 #define FMADDS 0x01d /* 29 */
102 #define FNMSUBS 0x01e /* 30 */
103 #define FNMADDS 0x01f /* 31 */
104
105 /* Opcode 63: */
106 /* A-Form: */
107 #define FDIV 0x012 /* 18 */
108 #define FSUB 0x014 /* 20 */
109 #define FADD 0x015 /* 21 */
110 #define FSQRT 0x016 /* 22 */
111 #define FSEL 0x017 /* 23 */
112 #define FMUL 0x019 /* 25 */
113 #define FRSQRTE 0x01a /* 26 */
114 #define FMSUB 0x01c /* 28 */
115 #define FMADD 0x01d /* 29 */
116 #define FNMSUB 0x01e /* 30 */
117 #define FNMADD 0x01f /* 31 */
118
119 /* X-Form: */
120 #define FCMPU 0x000 /* 0 */
121 #define FRSP 0x00c /* 12 */
122 #define FCTIW 0x00e /* 14 */
123 #define FCTIWZ 0x00f /* 15 */
124 #define FCMPO 0x020 /* 32 */
125 #define MTFSB1 0x026 /* 38 */
126 #define FNEG 0x028 /* 40 */
127 #define MCRFS 0x040 /* 64 */
128 #define MTFSB0 0x046 /* 70 */
129 #define FMR 0x048 /* 72 */
130 #define MTFSFI 0x086 /* 134 */
131 #define FNABS 0x088 /* 136 */
132 #define FABS 0x108 /* 264 */
133 #define MFFS 0x247 /* 583 */
134 #define MTFSF 0x2c7 /* 711 */
135
136
137 #define AB 2
138 #define AC 3
139 #define ABC 4
140 #define D 5
141 #define DU 6
142 #define X 7
143 #define XA 8
144 #define XB 9
145 #define XCR 11
146 #define XCRB 12
147 #define XCRI 13
148 #define XCRL 16
149 #define XE 14
150 #define XEU 15
151 #define XFLB 10
152
153 #ifdef CONFIG_MATH_EMULATION
154 static int
155 record_exception(struct pt_regs *regs, int eflag)
156 {
157 u32 fpscr;
158
159 fpscr = __FPU_FPSCR;
160
161 if (eflag) {
162 fpscr |= FPSCR_FX;
163 if (eflag & EFLAG_OVERFLOW)
164 fpscr |= FPSCR_OX;
165 if (eflag & EFLAG_UNDERFLOW)
166 fpscr |= FPSCR_UX;
167 if (eflag & EFLAG_DIVZERO)
168 fpscr |= FPSCR_ZX;
169 if (eflag & EFLAG_INEXACT)
170 fpscr |= FPSCR_XX;
171 if (eflag & EFLAG_INVALID)
172 fpscr |= FPSCR_VX;
173 if (eflag & EFLAG_VXSNAN)
174 fpscr |= FPSCR_VXSNAN;
175 if (eflag & EFLAG_VXISI)
176 fpscr |= FPSCR_VXISI;
177 if (eflag & EFLAG_VXIDI)
178 fpscr |= FPSCR_VXIDI;
179 if (eflag & EFLAG_VXZDZ)
180 fpscr |= FPSCR_VXZDZ;
181 if (eflag & EFLAG_VXIMZ)
182 fpscr |= FPSCR_VXIMZ;
183 if (eflag & EFLAG_VXVC)
184 fpscr |= FPSCR_VXVC;
185 if (eflag & EFLAG_VXSOFT)
186 fpscr |= FPSCR_VXSOFT;
187 if (eflag & EFLAG_VXSQRT)
188 fpscr |= FPSCR_VXSQRT;
189 if (eflag & EFLAG_VXCVI)
190 fpscr |= FPSCR_VXCVI;
191 }
192
193 // fpscr &= ~(FPSCR_VX);
194 if (fpscr & (FPSCR_VXSNAN | FPSCR_VXISI | FPSCR_VXIDI |
195 FPSCR_VXZDZ | FPSCR_VXIMZ | FPSCR_VXVC |
196 FPSCR_VXSOFT | FPSCR_VXSQRT | FPSCR_VXCVI))
197 fpscr |= FPSCR_VX;
198
199 fpscr &= ~(FPSCR_FEX);
200 if (((fpscr & FPSCR_VX) && (fpscr & FPSCR_VE)) ||
201 ((fpscr & FPSCR_OX) && (fpscr & FPSCR_OE)) ||
202 ((fpscr & FPSCR_UX) && (fpscr & FPSCR_UE)) ||
203 ((fpscr & FPSCR_ZX) && (fpscr & FPSCR_ZE)) ||
204 ((fpscr & FPSCR_XX) && (fpscr & FPSCR_XE)))
205 fpscr |= FPSCR_FEX;
206
207 __FPU_FPSCR = fpscr;
208
209 return (fpscr & FPSCR_FEX) ? 1 : 0;
210 }
211 #endif /* CONFIG_MATH_EMULATION */
212
213 int
214 do_mathemu(struct pt_regs *regs)
215 {
216 void *op0 = 0, *op1 = 0, *op2 = 0, *op3 = 0;
217 unsigned long pc = regs->nip;
218 signed short sdisp;
219 u32 insn = 0;
220 int idx = 0;
221 #ifdef CONFIG_MATH_EMULATION
222 int (*func)(void *, void *, void *, void *);
223 int type = 0;
224 int eflag, trap;
225 #endif
226
227 if (get_user(insn, (u32 *)pc))
228 return -EFAULT;
229
230 #ifndef CONFIG_MATH_EMULATION
231 switch (insn >> 26) {
232 case LFD:
233 idx = (insn >> 16) & 0x1f;
234 sdisp = (insn & 0xffff);
235 op0 = (void *)&current->thread.TS_FPR((insn >> 21) & 0x1f);
236 op1 = (void *)((idx ? regs->gpr[idx] : 0) + sdisp);
237 lfd(op0, op1, op2, op3);
238 break;
239 case LFDU:
240 idx = (insn >> 16) & 0x1f;
241 sdisp = (insn & 0xffff);
242 op0 = (void *)&current->thread.TS_FPR((insn >> 21) & 0x1f);
243 op1 = (void *)((idx ? regs->gpr[idx] : 0) + sdisp);
244 lfd(op0, op1, op2, op3);
245 regs->gpr[idx] = (unsigned long)op1;
246 break;
247 case STFD:
248 idx = (insn >> 16) & 0x1f;
249 sdisp = (insn & 0xffff);
250 op0 = (void *)&current->thread.TS_FPR((insn >> 21) & 0x1f);
251 op1 = (void *)((idx ? regs->gpr[idx] : 0) + sdisp);
252 stfd(op0, op1, op2, op3);
253 break;
254 case STFDU:
255 idx = (insn >> 16) & 0x1f;
256 sdisp = (insn & 0xffff);
257 op0 = (void *)&current->thread.TS_FPR((insn >> 21) & 0x1f);
258 op1 = (void *)((idx ? regs->gpr[idx] : 0) + sdisp);
259 stfd(op0, op1, op2, op3);
260 regs->gpr[idx] = (unsigned long)op1;
261 break;
262 case OP63:
263 op0 = (void *)&current->thread.TS_FPR((insn >> 21) & 0x1f);
264 op1 = (void *)&current->thread.TS_FPR((insn >> 11) & 0x1f);
265 fmr(op0, op1, op2, op3);
266 break;
267 default:
268 goto illegal;
269 }
270 #else /* CONFIG_MATH_EMULATION */
271 switch (insn >> 26) {
272 case LFS: func = lfs; type = D; break;
273 case LFSU: func = lfs; type = DU; break;
274 case LFD: func = lfd; type = D; break;
275 case LFDU: func = lfd; type = DU; break;
276 case STFS: func = stfs; type = D; break;
277 case STFSU: func = stfs; type = DU; break;
278 case STFD: func = stfd; type = D; break;
279 case STFDU: func = stfd; type = DU; break;
280
281 case OP31:
282 switch ((insn >> 1) & 0x3ff) {
283 case LFSX: func = lfs; type = XE; break;
284 case LFSUX: func = lfs; type = XEU; break;
285 case LFDX: func = lfd; type = XE; break;
286 case LFDUX: func = lfd; type = XEU; break;
287 case STFSX: func = stfs; type = XE; break;
288 case STFSUX: func = stfs; type = XEU; break;
289 case STFDX: func = stfd; type = XE; break;
290 case STFDUX: func = stfd; type = XEU; break;
291 case STFIWX: func = stfiwx; type = XE; break;
292 default:
293 goto illegal;
294 }
295 break;
296
297 case OP59:
298 switch ((insn >> 1) & 0x1f) {
299 case FDIVS: func = fdivs; type = AB; break;
300 case FSUBS: func = fsubs; type = AB; break;
301 case FADDS: func = fadds; type = AB; break;
302 case FSQRTS: func = fsqrts; type = AB; break;
303 case FRES: func = fres; type = AB; break;
304 case FMULS: func = fmuls; type = AC; break;
305 case FMSUBS: func = fmsubs; type = ABC; break;
306 case FMADDS: func = fmadds; type = ABC; break;
307 case FNMSUBS: func = fnmsubs; type = ABC; break;
308 case FNMADDS: func = fnmadds; type = ABC; break;
309 default:
310 goto illegal;
311 }
312 break;
313
314 case OP63:
315 if (insn & 0x20) {
316 switch ((insn >> 1) & 0x1f) {
317 case FDIV: func = fdiv; type = AB; break;
318 case FSUB: func = fsub; type = AB; break;
319 case FADD: func = fadd; type = AB; break;
320 case FSQRT: func = fsqrt; type = AB; break;
321 case FSEL: func = fsel; type = ABC; break;
322 case FMUL: func = fmul; type = AC; break;
323 case FRSQRTE: func = frsqrte; type = AB; break;
324 case FMSUB: func = fmsub; type = ABC; break;
325 case FMADD: func = fmadd; type = ABC; break;
326 case FNMSUB: func = fnmsub; type = ABC; break;
327 case FNMADD: func = fnmadd; type = ABC; break;
328 default:
329 goto illegal;
330 }
331 break;
332 }
333
334 switch ((insn >> 1) & 0x3ff) {
335 case FCMPU: func = fcmpu; type = XCR; break;
336 case FRSP: func = frsp; type = XB; break;
337 case FCTIW: func = fctiw; type = XB; break;
338 case FCTIWZ: func = fctiwz; type = XB; break;
339 case FCMPO: func = fcmpo; type = XCR; break;
340 case MTFSB1: func = mtfsb1; type = XCRB; break;
341 case FNEG: func = fneg; type = XB; break;
342 case MCRFS: func = mcrfs; type = XCRL; break;
343 case MTFSB0: func = mtfsb0; type = XCRB; break;
344 case FMR: func = fmr; type = XB; break;
345 case MTFSFI: func = mtfsfi; type = XCRI; break;
346 case FNABS: func = fnabs; type = XB; break;
347 case FABS: func = fabs; type = XB; break;
348 case MFFS: func = mffs; type = X; break;
349 case MTFSF: func = mtfsf; type = XFLB; break;
350 default:
351 goto illegal;
352 }
353 break;
354
355 default:
356 goto illegal;
357 }
358
359 switch (type) {
360 case AB:
361 op0 = (void *)&current->thread.TS_FPR((insn >> 21) & 0x1f);
362 op1 = (void *)&current->thread.TS_FPR((insn >> 16) & 0x1f);
363 op2 = (void *)&current->thread.TS_FPR((insn >> 11) & 0x1f);
364 break;
365
366 case AC:
367 op0 = (void *)&current->thread.TS_FPR((insn >> 21) & 0x1f);
368 op1 = (void *)&current->thread.TS_FPR((insn >> 16) & 0x1f);
369 op2 = (void *)&current->thread.TS_FPR((insn >> 6) & 0x1f);
370 break;
371
372 case ABC:
373 op0 = (void *)&current->thread.TS_FPR((insn >> 21) & 0x1f);
374 op1 = (void *)&current->thread.TS_FPR((insn >> 16) & 0x1f);
375 op2 = (void *)&current->thread.TS_FPR((insn >> 11) & 0x1f);
376 op3 = (void *)&current->thread.TS_FPR((insn >> 6) & 0x1f);
377 break;
378
379 case D:
380 idx = (insn >> 16) & 0x1f;
381 sdisp = (insn & 0xffff);
382 op0 = (void *)&current->thread.TS_FPR((insn >> 21) & 0x1f);
383 op1 = (void *)((idx ? regs->gpr[idx] : 0) + sdisp);
384 break;
385
386 case DU:
387 idx = (insn >> 16) & 0x1f;
388 if (!idx)
389 goto illegal;
390
391 sdisp = (insn & 0xffff);
392 op0 = (void *)&current->thread.TS_FPR((insn >> 21) & 0x1f);
393 op1 = (void *)(regs->gpr[idx] + sdisp);
394 break;
395
396 case X:
397 op0 = (void *)&current->thread.TS_FPR((insn >> 21) & 0x1f);
398 break;
399
400 case XA:
401 op0 = (void *)&current->thread.TS_FPR((insn >> 21) & 0x1f);
402 op1 = (void *)&current->thread.TS_FPR((insn >> 16) & 0x1f);
403 break;
404
405 case XB:
406 op0 = (void *)&current->thread.TS_FPR((insn >> 21) & 0x1f);
407 op1 = (void *)&current->thread.TS_FPR((insn >> 11) & 0x1f);
408 break;
409
410 case XE:
411 idx = (insn >> 16) & 0x1f;
412 op0 = (void *)&current->thread.TS_FPR((insn >> 21) & 0x1f);
413 if (!idx) {
414 if (((insn >> 1) & 0x3ff) == STFIWX)
415 op1 = (void *)(regs->gpr[(insn >> 11) & 0x1f]);
416 else
417 goto illegal;
418 } else {
419 op1 = (void *)(regs->gpr[idx] + regs->gpr[(insn >> 11) & 0x1f]);
420 }
421
422 break;
423
424 case XEU:
425 idx = (insn >> 16) & 0x1f;
426 op0 = (void *)&current->thread.TS_FPR((insn >> 21) & 0x1f);
427 op1 = (void *)((idx ? regs->gpr[idx] : 0)
428 + regs->gpr[(insn >> 11) & 0x1f]);
429 break;
430
431 case XCR:
432 op0 = (void *)&regs->ccr;
433 op1 = (void *)((insn >> 23) & 0x7);
434 op2 = (void *)&current->thread.TS_FPR((insn >> 16) & 0x1f);
435 op3 = (void *)&current->thread.TS_FPR((insn >> 11) & 0x1f);
436 break;
437
438 case XCRL:
439 op0 = (void *)&regs->ccr;
440 op1 = (void *)((insn >> 23) & 0x7);
441 op2 = (void *)((insn >> 18) & 0x7);
442 break;
443
444 case XCRB:
445 op0 = (void *)((insn >> 21) & 0x1f);
446 break;
447
448 case XCRI:
449 op0 = (void *)((insn >> 23) & 0x7);
450 op1 = (void *)((insn >> 12) & 0xf);
451 break;
452
453 case XFLB:
454 op0 = (void *)((insn >> 17) & 0xff);
455 op1 = (void *)&current->thread.TS_FPR((insn >> 11) & 0x1f);
456 break;
457
458 default:
459 goto illegal;
460 }
461
462 eflag = func(op0, op1, op2, op3);
463
464 if (insn & 1) {
465 regs->ccr &= ~(0x0f000000);
466 regs->ccr |= (__FPU_FPSCR >> 4) & 0x0f000000;
467 }
468
469 trap = record_exception(regs, eflag);
470 if (trap)
471 return 1;
472
473 switch (type) {
474 case DU:
475 case XEU:
476 regs->gpr[idx] = (unsigned long)op1;
477 break;
478
479 default:
480 break;
481 }
482 #endif /* CONFIG_MATH_EMULATION */
483
484 regs->nip += 4;
485 return 0;
486
487 illegal:
488 return -ENOSYS;
489 }
linux-next