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1da177e4 LT |
1 | /* |
2 | * cp1emu.c: a MIPS coprocessor 1 (fpu) instruction emulator | |
3 | * | |
4 | * MIPS floating point support | |
5 | * Copyright (C) 1994-2000 Algorithmics Ltd. | |
6 | * http://www.algor.co.uk | |
7 | * | |
8 | * Kevin D. Kissell, kevink@mips.com and Carsten Langgaard, carstenl@mips.com | |
9 | * Copyright (C) 2000 MIPS Technologies, Inc. | |
10 | * | |
11 | * This program is free software; you can distribute it and/or modify it | |
12 | * under the terms of the GNU General Public License (Version 2) as | |
13 | * published by the Free Software Foundation. | |
14 | * | |
15 | * This program is distributed in the hope it will be useful, but WITHOUT | |
16 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
17 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
18 | * for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public License along | |
21 | * with this program; if not, write to the Free Software Foundation, Inc., | |
22 | * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA. | |
23 | * | |
24 | * A complete emulator for MIPS coprocessor 1 instructions. This is | |
25 | * required for #float(switch) or #float(trap), where it catches all | |
26 | * COP1 instructions via the "CoProcessor Unusable" exception. | |
27 | * | |
28 | * More surprisingly it is also required for #float(ieee), to help out | |
29 | * the hardware fpu at the boundaries of the IEEE-754 representation | |
30 | * (denormalised values, infinities, underflow, etc). It is made | |
31 | * quite nasty because emulation of some non-COP1 instructions is | |
32 | * required, e.g. in branch delay slots. | |
33 | * | |
34 | * Note if you know that you won't have an fpu, then you'll get much | |
35 | * better performance by compiling with -msoft-float! | |
36 | */ | |
37 | #include <linux/sched.h> | |
38 | ||
39 | #include <asm/inst.h> | |
40 | #include <asm/bootinfo.h> | |
41 | #include <asm/cpu.h> | |
42 | #include <asm/cpu-features.h> | |
43 | #include <asm/processor.h> | |
44 | #include <asm/ptrace.h> | |
45 | #include <asm/signal.h> | |
46 | #include <asm/mipsregs.h> | |
47 | #include <asm/fpu_emulator.h> | |
48 | #include <asm/uaccess.h> | |
49 | #include <asm/branch.h> | |
50 | ||
51 | #include "ieee754.h" | |
52 | #include "dsemul.h" | |
53 | ||
54 | /* Strap kernel emulator for full MIPS IV emulation */ | |
55 | ||
56 | #ifdef __mips | |
57 | #undef __mips | |
58 | #endif | |
59 | #define __mips 4 | |
60 | ||
61 | /* Function which emulates a floating point instruction. */ | |
62 | ||
63 | static int fpu_emu(struct pt_regs *, struct mips_fpu_soft_struct *, | |
64 | mips_instruction); | |
65 | ||
66 | #if __mips >= 4 && __mips != 32 | |
67 | static int fpux_emu(struct pt_regs *, | |
68 | struct mips_fpu_soft_struct *, mips_instruction); | |
69 | #endif | |
70 | ||
71 | /* Further private data for which no space exists in mips_fpu_soft_struct */ | |
72 | ||
73 | struct mips_fpu_emulator_private fpuemuprivate; | |
74 | ||
75 | /* Control registers */ | |
76 | ||
77 | #define FPCREG_RID 0 /* $0 = revision id */ | |
78 | #define FPCREG_CSR 31 /* $31 = csr */ | |
79 | ||
80 | /* Convert Mips rounding mode (0..3) to IEEE library modes. */ | |
81 | static const unsigned char ieee_rm[4] = { | |
82 | IEEE754_RN, IEEE754_RZ, IEEE754_RU, IEEE754_RD | |
83 | }; | |
84 | ||
85 | #if __mips >= 4 | |
86 | /* convert condition code register number to csr bit */ | |
87 | static const unsigned int fpucondbit[8] = { | |
88 | FPU_CSR_COND0, | |
89 | FPU_CSR_COND1, | |
90 | FPU_CSR_COND2, | |
91 | FPU_CSR_COND3, | |
92 | FPU_CSR_COND4, | |
93 | FPU_CSR_COND5, | |
94 | FPU_CSR_COND6, | |
95 | FPU_CSR_COND7 | |
96 | }; | |
97 | #endif | |
98 | ||
99 | ||
100 | /* | |
101 | * Redundant with logic already in kernel/branch.c, | |
102 | * embedded in compute_return_epc. At some point, | |
103 | * a single subroutine should be used across both | |
104 | * modules. | |
105 | */ | |
106 | static int isBranchInstr(mips_instruction * i) | |
107 | { | |
108 | switch (MIPSInst_OPCODE(*i)) { | |
109 | case spec_op: | |
110 | switch (MIPSInst_FUNC(*i)) { | |
111 | case jalr_op: | |
112 | case jr_op: | |
113 | return 1; | |
114 | } | |
115 | break; | |
116 | ||
117 | case bcond_op: | |
118 | switch (MIPSInst_RT(*i)) { | |
119 | case bltz_op: | |
120 | case bgez_op: | |
121 | case bltzl_op: | |
122 | case bgezl_op: | |
123 | case bltzal_op: | |
124 | case bgezal_op: | |
125 | case bltzall_op: | |
126 | case bgezall_op: | |
127 | return 1; | |
128 | } | |
129 | break; | |
130 | ||
131 | case j_op: | |
132 | case jal_op: | |
133 | case jalx_op: | |
134 | case beq_op: | |
135 | case bne_op: | |
136 | case blez_op: | |
137 | case bgtz_op: | |
138 | case beql_op: | |
139 | case bnel_op: | |
140 | case blezl_op: | |
141 | case bgtzl_op: | |
142 | return 1; | |
143 | ||
144 | case cop0_op: | |
145 | case cop1_op: | |
146 | case cop2_op: | |
147 | case cop1x_op: | |
148 | if (MIPSInst_RS(*i) == bc_op) | |
149 | return 1; | |
150 | break; | |
151 | } | |
152 | ||
153 | return 0; | |
154 | } | |
155 | ||
156 | /* | |
157 | * In the Linux kernel, we support selection of FPR format on the | |
158 | * basis of the Status.FR bit. This does imply that, if a full 32 | |
159 | * FPRs are desired, there needs to be a flip-flop that can be written | |
160 | * to one at that bit position. In any case, O32 MIPS ABI uses | |
161 | * only the even FPRs (Status.FR = 0). | |
162 | */ | |
163 | ||
164 | #define CP0_STATUS_FR_SUPPORT | |
165 | ||
166 | #ifdef CP0_STATUS_FR_SUPPORT | |
167 | #define FR_BIT ST0_FR | |
168 | #else | |
169 | #define FR_BIT 0 | |
170 | #endif | |
171 | ||
172 | #define SIFROMREG(si,x) ((si) = \ | |
173 | (xcp->cp0_status & FR_BIT) || !(x & 1) ? \ | |
174 | (int)ctx->fpr[x] : \ | |
175 | (int)(ctx->fpr[x & ~1] >> 32 )) | |
176 | #define SITOREG(si,x) (ctx->fpr[x & ~((xcp->cp0_status & FR_BIT) == 0)] = \ | |
177 | (xcp->cp0_status & FR_BIT) || !(x & 1) ? \ | |
178 | ctx->fpr[x & ~1] >> 32 << 32 | (u32)(si) : \ | |
179 | ctx->fpr[x & ~1] << 32 >> 32 | (u64)(si) << 32) | |
180 | ||
181 | #define DIFROMREG(di,x) ((di) = \ | |
182 | ctx->fpr[x & ~((xcp->cp0_status & FR_BIT) == 0)]) | |
183 | #define DITOREG(di,x) (ctx->fpr[x & ~((xcp->cp0_status & FR_BIT) == 0)] \ | |
184 | = (di)) | |
185 | ||
186 | #define SPFROMREG(sp,x) SIFROMREG((sp).bits,x) | |
187 | #define SPTOREG(sp,x) SITOREG((sp).bits,x) | |
188 | #define DPFROMREG(dp,x) DIFROMREG((dp).bits,x) | |
189 | #define DPTOREG(dp,x) DITOREG((dp).bits,x) | |
190 | ||
191 | /* | |
192 | * Emulate the single floating point instruction pointed at by EPC. | |
193 | * Two instructions if the instruction is in a branch delay slot. | |
194 | */ | |
195 | ||
196 | static int cop1Emulate(struct pt_regs *xcp, struct mips_fpu_soft_struct *ctx) | |
197 | { | |
198 | mips_instruction ir; | |
333d1f67 | 199 | void * emulpc, *contpc; |
1da177e4 LT |
200 | unsigned int cond; |
201 | ||
202 | if (get_user(ir, (mips_instruction *) xcp->cp0_epc)) { | |
203 | fpuemuprivate.stats.errors++; | |
204 | return SIGBUS; | |
205 | } | |
206 | ||
207 | /* XXX NEC Vr54xx bug workaround */ | |
208 | if ((xcp->cp0_cause & CAUSEF_BD) && !isBranchInstr(&ir)) | |
209 | xcp->cp0_cause &= ~CAUSEF_BD; | |
210 | ||
211 | if (xcp->cp0_cause & CAUSEF_BD) { | |
212 | /* | |
213 | * The instruction to be emulated is in a branch delay slot | |
214 | * which means that we have to emulate the branch instruction | |
215 | * BEFORE we do the cop1 instruction. | |
216 | * | |
217 | * This branch could be a COP1 branch, but in that case we | |
218 | * would have had a trap for that instruction, and would not | |
219 | * come through this route. | |
220 | * | |
221 | * Linux MIPS branch emulator operates on context, updating the | |
222 | * cp0_epc. | |
223 | */ | |
333d1f67 | 224 | emulpc = (void *) (xcp->cp0_epc + 4); /* Snapshot emulation target */ |
1da177e4 LT |
225 | |
226 | if (__compute_return_epc(xcp)) { | |
227 | #ifdef CP1DBG | |
228 | printk("failed to emulate branch at %p\n", | |
333d1f67 | 229 | (void *) (xcp->cp0_epc)); |
1da177e4 LT |
230 | #endif |
231 | return SIGILL; | |
232 | } | |
233 | if (get_user(ir, (mips_instruction *) emulpc)) { | |
234 | fpuemuprivate.stats.errors++; | |
235 | return SIGBUS; | |
236 | } | |
237 | /* __compute_return_epc() will have updated cp0_epc */ | |
333d1f67 | 238 | contpc = (void *) xcp->cp0_epc; |
1da177e4 | 239 | /* In order not to confuse ptrace() et al, tweak context */ |
333d1f67 RB |
240 | xcp->cp0_epc = (unsigned long) emulpc - 4; |
241 | } else { | |
242 | emulpc = (void *) xcp->cp0_epc; | |
243 | contpc = (void *) (xcp->cp0_epc + 4); | |
1da177e4 LT |
244 | } |
245 | ||
246 | emul: | |
247 | fpuemuprivate.stats.emulated++; | |
248 | switch (MIPSInst_OPCODE(ir)) { | |
249 | #ifndef SINGLE_ONLY_FPU | |
250 | case ldc1_op:{ | |
333d1f67 | 251 | u64 *va = (void *) (xcp->regs[MIPSInst_RS(ir)] + |
1da177e4 LT |
252 | MIPSInst_SIMM(ir)); |
253 | u64 val; | |
254 | ||
255 | fpuemuprivate.stats.loads++; | |
256 | if (get_user(val, va)) { | |
257 | fpuemuprivate.stats.errors++; | |
258 | return SIGBUS; | |
259 | } | |
260 | DITOREG(val, MIPSInst_RT(ir)); | |
261 | break; | |
262 | } | |
263 | ||
264 | case sdc1_op:{ | |
333d1f67 | 265 | u64 *va = (void *) (xcp->regs[MIPSInst_RS(ir)] + |
1da177e4 LT |
266 | MIPSInst_SIMM(ir)); |
267 | u64 val; | |
268 | ||
269 | fpuemuprivate.stats.stores++; | |
270 | DIFROMREG(val, MIPSInst_RT(ir)); | |
271 | if (put_user(val, va)) { | |
272 | fpuemuprivate.stats.errors++; | |
273 | return SIGBUS; | |
274 | } | |
275 | break; | |
276 | } | |
277 | #endif | |
278 | ||
279 | case lwc1_op:{ | |
333d1f67 | 280 | u32 *va = (void *) (xcp->regs[MIPSInst_RS(ir)] + |
1da177e4 LT |
281 | MIPSInst_SIMM(ir)); |
282 | u32 val; | |
283 | ||
284 | fpuemuprivate.stats.loads++; | |
285 | if (get_user(val, va)) { | |
286 | fpuemuprivate.stats.errors++; | |
287 | return SIGBUS; | |
288 | } | |
289 | #ifdef SINGLE_ONLY_FPU | |
290 | if (MIPSInst_RT(ir) & 1) { | |
291 | /* illegal register in single-float mode */ | |
292 | return SIGILL; | |
293 | } | |
294 | #endif | |
295 | SITOREG(val, MIPSInst_RT(ir)); | |
296 | break; | |
297 | } | |
298 | ||
299 | case swc1_op:{ | |
333d1f67 | 300 | u32 *va = (void *) (xcp->regs[MIPSInst_RS(ir)] + |
1da177e4 LT |
301 | MIPSInst_SIMM(ir)); |
302 | u32 val; | |
303 | ||
304 | fpuemuprivate.stats.stores++; | |
305 | #ifdef SINGLE_ONLY_FPU | |
306 | if (MIPSInst_RT(ir) & 1) { | |
307 | /* illegal register in single-float mode */ | |
308 | return SIGILL; | |
309 | } | |
310 | #endif | |
311 | SIFROMREG(val, MIPSInst_RT(ir)); | |
312 | if (put_user(val, va)) { | |
313 | fpuemuprivate.stats.errors++; | |
314 | return SIGBUS; | |
315 | } | |
316 | break; | |
317 | } | |
318 | ||
319 | case cop1_op: | |
320 | switch (MIPSInst_RS(ir)) { | |
321 | ||
766160c2 | 322 | #if defined(__mips64) && !defined(SINGLE_ONLY_FPU) |
1da177e4 LT |
323 | case dmfc_op: |
324 | /* copregister fs -> gpr[rt] */ | |
325 | if (MIPSInst_RT(ir) != 0) { | |
326 | DIFROMREG(xcp->regs[MIPSInst_RT(ir)], | |
327 | MIPSInst_RD(ir)); | |
328 | } | |
329 | break; | |
330 | ||
331 | case dmtc_op: | |
332 | /* copregister fs <- rt */ | |
333 | DITOREG(xcp->regs[MIPSInst_RT(ir)], MIPSInst_RD(ir)); | |
334 | break; | |
335 | #endif | |
336 | ||
337 | case mfc_op: | |
338 | /* copregister rd -> gpr[rt] */ | |
339 | #ifdef SINGLE_ONLY_FPU | |
340 | if (MIPSInst_RD(ir) & 1) { | |
341 | /* illegal register in single-float mode */ | |
342 | return SIGILL; | |
343 | } | |
344 | #endif | |
345 | if (MIPSInst_RT(ir) != 0) { | |
346 | SIFROMREG(xcp->regs[MIPSInst_RT(ir)], | |
347 | MIPSInst_RD(ir)); | |
348 | } | |
349 | break; | |
350 | ||
351 | case mtc_op: | |
352 | /* copregister rd <- rt */ | |
353 | #ifdef SINGLE_ONLY_FPU | |
354 | if (MIPSInst_RD(ir) & 1) { | |
355 | /* illegal register in single-float mode */ | |
356 | return SIGILL; | |
357 | } | |
358 | #endif | |
359 | SITOREG(xcp->regs[MIPSInst_RT(ir)], MIPSInst_RD(ir)); | |
360 | break; | |
361 | ||
362 | case cfc_op:{ | |
363 | /* cop control register rd -> gpr[rt] */ | |
364 | u32 value; | |
365 | ||
366 | if (ir == CP1UNDEF) { | |
367 | return do_dsemulret(xcp); | |
368 | } | |
369 | if (MIPSInst_RD(ir) == FPCREG_CSR) { | |
370 | value = ctx->fcr31; | |
371 | #ifdef CSRTRACE | |
372 | printk("%p gpr[%d]<-csr=%08x\n", | |
333d1f67 | 373 | (void *) (xcp->cp0_epc), |
1da177e4 LT |
374 | MIPSInst_RT(ir), value); |
375 | #endif | |
376 | } | |
377 | else if (MIPSInst_RD(ir) == FPCREG_RID) | |
378 | value = 0; | |
379 | else | |
380 | value = 0; | |
381 | if (MIPSInst_RT(ir)) | |
382 | xcp->regs[MIPSInst_RT(ir)] = value; | |
383 | break; | |
384 | } | |
385 | ||
386 | case ctc_op:{ | |
387 | /* copregister rd <- rt */ | |
388 | u32 value; | |
389 | ||
390 | if (MIPSInst_RT(ir) == 0) | |
391 | value = 0; | |
392 | else | |
393 | value = xcp->regs[MIPSInst_RT(ir)]; | |
394 | ||
395 | /* we only have one writable control reg | |
396 | */ | |
397 | if (MIPSInst_RD(ir) == FPCREG_CSR) { | |
398 | #ifdef CSRTRACE | |
399 | printk("%p gpr[%d]->csr=%08x\n", | |
333d1f67 | 400 | (void *) (xcp->cp0_epc), |
1da177e4 LT |
401 | MIPSInst_RT(ir), value); |
402 | #endif | |
403 | ctx->fcr31 = value; | |
404 | /* copy new rounding mode and | |
405 | flush bit to ieee library state! */ | |
406 | ieee754_csr.nod = (ctx->fcr31 & 0x1000000) != 0; | |
407 | ieee754_csr.rm = ieee_rm[value & 0x3]; | |
408 | } | |
409 | if ((ctx->fcr31 >> 5) & ctx->fcr31 & FPU_CSR_ALL_E) { | |
410 | return SIGFPE; | |
411 | } | |
412 | break; | |
413 | } | |
414 | ||
415 | case bc_op:{ | |
416 | int likely = 0; | |
417 | ||
418 | if (xcp->cp0_cause & CAUSEF_BD) | |
419 | return SIGILL; | |
420 | ||
421 | #if __mips >= 4 | |
422 | cond = ctx->fcr31 & fpucondbit[MIPSInst_RT(ir) >> 2]; | |
423 | #else | |
424 | cond = ctx->fcr31 & FPU_CSR_COND; | |
425 | #endif | |
426 | switch (MIPSInst_RT(ir) & 3) { | |
427 | case bcfl_op: | |
428 | likely = 1; | |
429 | case bcf_op: | |
430 | cond = !cond; | |
431 | break; | |
432 | case bctl_op: | |
433 | likely = 1; | |
434 | case bct_op: | |
435 | break; | |
436 | default: | |
437 | /* thats an illegal instruction */ | |
438 | return SIGILL; | |
439 | } | |
440 | ||
441 | xcp->cp0_cause |= CAUSEF_BD; | |
442 | if (cond) { | |
443 | /* branch taken: emulate dslot | |
444 | * instruction | |
445 | */ | |
446 | xcp->cp0_epc += 4; | |
333d1f67 | 447 | contpc = (void *) |
1da177e4 LT |
448 | (xcp->cp0_epc + |
449 | (MIPSInst_SIMM(ir) << 2)); | |
450 | ||
451 | if (get_user(ir, (mips_instruction *) | |
333d1f67 | 452 | (void *) xcp->cp0_epc)) { |
1da177e4 LT |
453 | fpuemuprivate.stats.errors++; |
454 | return SIGBUS; | |
455 | } | |
456 | ||
457 | switch (MIPSInst_OPCODE(ir)) { | |
458 | case lwc1_op: | |
459 | case swc1_op: | |
460 | #if (__mips >= 2 || __mips64) && !defined(SINGLE_ONLY_FPU) | |
461 | case ldc1_op: | |
462 | case sdc1_op: | |
463 | #endif | |
464 | case cop1_op: | |
465 | #if __mips >= 4 && __mips != 32 | |
466 | case cop1x_op: | |
467 | #endif | |
468 | /* its one of ours */ | |
469 | goto emul; | |
470 | #if __mips >= 4 | |
471 | case spec_op: | |
472 | if (MIPSInst_FUNC(ir) == movc_op) | |
473 | goto emul; | |
474 | break; | |
475 | #endif | |
476 | } | |
477 | ||
478 | /* | |
479 | * Single step the non-cp1 | |
480 | * instruction in the dslot | |
481 | */ | |
333d1f67 | 482 | return mips_dsemul(xcp, ir, (unsigned long) contpc); |
1da177e4 LT |
483 | } |
484 | else { | |
485 | /* branch not taken */ | |
486 | if (likely) { | |
487 | /* | |
488 | * branch likely nullifies | |
489 | * dslot if not taken | |
490 | */ | |
491 | xcp->cp0_epc += 4; | |
492 | contpc += 4; | |
493 | /* | |
494 | * else continue & execute | |
495 | * dslot as normal insn | |
496 | */ | |
497 | } | |
498 | } | |
499 | break; | |
500 | } | |
501 | ||
502 | default: | |
503 | if (!(MIPSInst_RS(ir) & 0x10)) | |
504 | return SIGILL; | |
505 | { | |
506 | int sig; | |
507 | ||
508 | /* a real fpu computation instruction */ | |
509 | if ((sig = fpu_emu(xcp, ctx, ir))) | |
510 | return sig; | |
511 | } | |
512 | } | |
513 | break; | |
514 | ||
515 | #if __mips >= 4 && __mips != 32 | |
516 | case cop1x_op:{ | |
517 | int sig; | |
518 | ||
519 | if ((sig = fpux_emu(xcp, ctx, ir))) | |
520 | return sig; | |
521 | break; | |
522 | } | |
523 | #endif | |
524 | ||
525 | #if __mips >= 4 | |
526 | case spec_op: | |
527 | if (MIPSInst_FUNC(ir) != movc_op) | |
528 | return SIGILL; | |
529 | cond = fpucondbit[MIPSInst_RT(ir) >> 2]; | |
530 | if (((ctx->fcr31 & cond) != 0) == ((MIPSInst_RT(ir) & 1) != 0)) | |
531 | xcp->regs[MIPSInst_RD(ir)] = | |
532 | xcp->regs[MIPSInst_RS(ir)]; | |
533 | break; | |
534 | #endif | |
535 | ||
536 | default: | |
537 | return SIGILL; | |
538 | } | |
539 | ||
540 | /* we did it !! */ | |
333d1f67 | 541 | xcp->cp0_epc = (unsigned long) contpc; |
1da177e4 | 542 | xcp->cp0_cause &= ~CAUSEF_BD; |
333d1f67 | 543 | |
1da177e4 LT |
544 | return 0; |
545 | } | |
546 | ||
547 | /* | |
548 | * Conversion table from MIPS compare ops 48-63 | |
549 | * cond = ieee754dp_cmp(x,y,IEEE754_UN,sig); | |
550 | */ | |
551 | static const unsigned char cmptab[8] = { | |
552 | 0, /* cmp_0 (sig) cmp_sf */ | |
553 | IEEE754_CUN, /* cmp_un (sig) cmp_ngle */ | |
554 | IEEE754_CEQ, /* cmp_eq (sig) cmp_seq */ | |
555 | IEEE754_CEQ | IEEE754_CUN, /* cmp_ueq (sig) cmp_ngl */ | |
556 | IEEE754_CLT, /* cmp_olt (sig) cmp_lt */ | |
557 | IEEE754_CLT | IEEE754_CUN, /* cmp_ult (sig) cmp_nge */ | |
558 | IEEE754_CLT | IEEE754_CEQ, /* cmp_ole (sig) cmp_le */ | |
559 | IEEE754_CLT | IEEE754_CEQ | IEEE754_CUN, /* cmp_ule (sig) cmp_ngt */ | |
560 | }; | |
561 | ||
562 | ||
563 | #if __mips >= 4 && __mips != 32 | |
564 | ||
565 | /* | |
566 | * Additional MIPS4 instructions | |
567 | */ | |
568 | ||
569 | #define DEF3OP(name, p, f1, f2, f3) \ | |
570 | static ieee754##p fpemu_##p##_##name (ieee754##p r, ieee754##p s, \ | |
571 | ieee754##p t) \ | |
572 | { \ | |
573 | struct ieee754_csr ieee754_csr_save; \ | |
574 | s = f1 (s, t); \ | |
575 | ieee754_csr_save = ieee754_csr; \ | |
576 | s = f2 (s, r); \ | |
577 | ieee754_csr_save.cx |= ieee754_csr.cx; \ | |
578 | ieee754_csr_save.sx |= ieee754_csr.sx; \ | |
579 | s = f3 (s); \ | |
580 | ieee754_csr.cx |= ieee754_csr_save.cx; \ | |
581 | ieee754_csr.sx |= ieee754_csr_save.sx; \ | |
582 | return s; \ | |
583 | } | |
584 | ||
585 | static ieee754dp fpemu_dp_recip(ieee754dp d) | |
586 | { | |
587 | return ieee754dp_div(ieee754dp_one(0), d); | |
588 | } | |
589 | ||
590 | static ieee754dp fpemu_dp_rsqrt(ieee754dp d) | |
591 | { | |
592 | return ieee754dp_div(ieee754dp_one(0), ieee754dp_sqrt(d)); | |
593 | } | |
594 | ||
595 | static ieee754sp fpemu_sp_recip(ieee754sp s) | |
596 | { | |
597 | return ieee754sp_div(ieee754sp_one(0), s); | |
598 | } | |
599 | ||
600 | static ieee754sp fpemu_sp_rsqrt(ieee754sp s) | |
601 | { | |
602 | return ieee754sp_div(ieee754sp_one(0), ieee754sp_sqrt(s)); | |
603 | } | |
604 | ||
605 | DEF3OP(madd, sp, ieee754sp_mul, ieee754sp_add,); | |
606 | DEF3OP(msub, sp, ieee754sp_mul, ieee754sp_sub,); | |
607 | DEF3OP(nmadd, sp, ieee754sp_mul, ieee754sp_add, ieee754sp_neg); | |
608 | DEF3OP(nmsub, sp, ieee754sp_mul, ieee754sp_sub, ieee754sp_neg); | |
609 | DEF3OP(madd, dp, ieee754dp_mul, ieee754dp_add,); | |
610 | DEF3OP(msub, dp, ieee754dp_mul, ieee754dp_sub,); | |
611 | DEF3OP(nmadd, dp, ieee754dp_mul, ieee754dp_add, ieee754dp_neg); | |
612 | DEF3OP(nmsub, dp, ieee754dp_mul, ieee754dp_sub, ieee754dp_neg); | |
613 | ||
614 | static int fpux_emu(struct pt_regs *xcp, struct mips_fpu_soft_struct *ctx, | |
615 | mips_instruction ir) | |
616 | { | |
617 | unsigned rcsr = 0; /* resulting csr */ | |
618 | ||
619 | fpuemuprivate.stats.cp1xops++; | |
620 | ||
621 | switch (MIPSInst_FMA_FFMT(ir)) { | |
622 | case s_fmt:{ /* 0 */ | |
623 | ||
624 | ieee754sp(*handler) (ieee754sp, ieee754sp, ieee754sp); | |
625 | ieee754sp fd, fr, fs, ft; | |
626 | u32 *va; | |
627 | u32 val; | |
628 | ||
629 | switch (MIPSInst_FUNC(ir)) { | |
630 | case lwxc1_op: | |
333d1f67 | 631 | va = (void *) (xcp->regs[MIPSInst_FR(ir)] + |
1da177e4 LT |
632 | xcp->regs[MIPSInst_FT(ir)]); |
633 | ||
634 | fpuemuprivate.stats.loads++; | |
635 | if (get_user(val, va)) { | |
636 | fpuemuprivate.stats.errors++; | |
637 | return SIGBUS; | |
638 | } | |
639 | #ifdef SINGLE_ONLY_FPU | |
640 | if (MIPSInst_FD(ir) & 1) { | |
641 | /* illegal register in single-float | |
642 | * mode | |
643 | */ | |
644 | return SIGILL; | |
645 | } | |
646 | #endif | |
647 | SITOREG(val, MIPSInst_FD(ir)); | |
648 | break; | |
649 | ||
650 | case swxc1_op: | |
333d1f67 | 651 | va = (void *) (xcp->regs[MIPSInst_FR(ir)] + |
1da177e4 LT |
652 | xcp->regs[MIPSInst_FT(ir)]); |
653 | ||
654 | fpuemuprivate.stats.stores++; | |
655 | #ifdef SINGLE_ONLY_FPU | |
656 | if (MIPSInst_FS(ir) & 1) { | |
657 | /* illegal register in single-float | |
658 | * mode | |
659 | */ | |
660 | return SIGILL; | |
661 | } | |
662 | #endif | |
663 | ||
664 | SIFROMREG(val, MIPSInst_FS(ir)); | |
665 | if (put_user(val, va)) { | |
666 | fpuemuprivate.stats.errors++; | |
667 | return SIGBUS; | |
668 | } | |
669 | break; | |
670 | ||
671 | case madd_s_op: | |
672 | handler = fpemu_sp_madd; | |
673 | goto scoptop; | |
674 | case msub_s_op: | |
675 | handler = fpemu_sp_msub; | |
676 | goto scoptop; | |
677 | case nmadd_s_op: | |
678 | handler = fpemu_sp_nmadd; | |
679 | goto scoptop; | |
680 | case nmsub_s_op: | |
681 | handler = fpemu_sp_nmsub; | |
682 | goto scoptop; | |
683 | ||
684 | scoptop: | |
685 | SPFROMREG(fr, MIPSInst_FR(ir)); | |
686 | SPFROMREG(fs, MIPSInst_FS(ir)); | |
687 | SPFROMREG(ft, MIPSInst_FT(ir)); | |
688 | fd = (*handler) (fr, fs, ft); | |
689 | SPTOREG(fd, MIPSInst_FD(ir)); | |
690 | ||
691 | copcsr: | |
692 | if (ieee754_cxtest(IEEE754_INEXACT)) | |
693 | rcsr |= FPU_CSR_INE_X | FPU_CSR_INE_S; | |
694 | if (ieee754_cxtest(IEEE754_UNDERFLOW)) | |
695 | rcsr |= FPU_CSR_UDF_X | FPU_CSR_UDF_S; | |
696 | if (ieee754_cxtest(IEEE754_OVERFLOW)) | |
697 | rcsr |= FPU_CSR_OVF_X | FPU_CSR_OVF_S; | |
698 | if (ieee754_cxtest(IEEE754_INVALID_OPERATION)) | |
699 | rcsr |= FPU_CSR_INV_X | FPU_CSR_INV_S; | |
700 | ||
701 | ctx->fcr31 = (ctx->fcr31 & ~FPU_CSR_ALL_X) | rcsr; | |
702 | if (ieee754_csr.nod) | |
703 | ctx->fcr31 |= 0x1000000; | |
704 | if ((ctx->fcr31 >> 5) & ctx->fcr31 & FPU_CSR_ALL_E) { | |
705 | /*printk ("SIGFPE: fpu csr = %08x\n", | |
706 | ctx->fcr31); */ | |
707 | return SIGFPE; | |
708 | } | |
709 | ||
710 | break; | |
711 | ||
712 | default: | |
713 | return SIGILL; | |
714 | } | |
715 | break; | |
716 | } | |
717 | ||
718 | #ifndef SINGLE_ONLY_FPU | |
719 | case d_fmt:{ /* 1 */ | |
720 | ieee754dp(*handler) (ieee754dp, ieee754dp, ieee754dp); | |
721 | ieee754dp fd, fr, fs, ft; | |
722 | u64 *va; | |
723 | u64 val; | |
724 | ||
725 | switch (MIPSInst_FUNC(ir)) { | |
726 | case ldxc1_op: | |
333d1f67 | 727 | va = (void *) (xcp->regs[MIPSInst_FR(ir)] + |
1da177e4 LT |
728 | xcp->regs[MIPSInst_FT(ir)]); |
729 | ||
730 | fpuemuprivate.stats.loads++; | |
731 | if (get_user(val, va)) { | |
732 | fpuemuprivate.stats.errors++; | |
733 | return SIGBUS; | |
734 | } | |
735 | DITOREG(val, MIPSInst_FD(ir)); | |
736 | break; | |
737 | ||
738 | case sdxc1_op: | |
333d1f67 | 739 | va = (void *) (xcp->regs[MIPSInst_FR(ir)] + |
1da177e4 LT |
740 | xcp->regs[MIPSInst_FT(ir)]); |
741 | ||
742 | fpuemuprivate.stats.stores++; | |
743 | DIFROMREG(val, MIPSInst_FS(ir)); | |
744 | if (put_user(val, va)) { | |
745 | fpuemuprivate.stats.errors++; | |
746 | return SIGBUS; | |
747 | } | |
748 | break; | |
749 | ||
750 | case madd_d_op: | |
751 | handler = fpemu_dp_madd; | |
752 | goto dcoptop; | |
753 | case msub_d_op: | |
754 | handler = fpemu_dp_msub; | |
755 | goto dcoptop; | |
756 | case nmadd_d_op: | |
757 | handler = fpemu_dp_nmadd; | |
758 | goto dcoptop; | |
759 | case nmsub_d_op: | |
760 | handler = fpemu_dp_nmsub; | |
761 | goto dcoptop; | |
762 | ||
763 | dcoptop: | |
764 | DPFROMREG(fr, MIPSInst_FR(ir)); | |
765 | DPFROMREG(fs, MIPSInst_FS(ir)); | |
766 | DPFROMREG(ft, MIPSInst_FT(ir)); | |
767 | fd = (*handler) (fr, fs, ft); | |
768 | DPTOREG(fd, MIPSInst_FD(ir)); | |
769 | goto copcsr; | |
770 | ||
771 | default: | |
772 | return SIGILL; | |
773 | } | |
774 | break; | |
775 | } | |
776 | #endif | |
777 | ||
778 | case 0x7: /* 7 */ | |
779 | if (MIPSInst_FUNC(ir) != pfetch_op) { | |
780 | return SIGILL; | |
781 | } | |
782 | /* ignore prefx operation */ | |
783 | break; | |
784 | ||
785 | default: | |
786 | return SIGILL; | |
787 | } | |
788 | ||
789 | return 0; | |
790 | } | |
791 | #endif | |
792 | ||
793 | ||
794 | ||
795 | /* | |
796 | * Emulate a single COP1 arithmetic instruction. | |
797 | */ | |
798 | static int fpu_emu(struct pt_regs *xcp, struct mips_fpu_soft_struct *ctx, | |
799 | mips_instruction ir) | |
800 | { | |
801 | int rfmt; /* resulting format */ | |
802 | unsigned rcsr = 0; /* resulting csr */ | |
803 | unsigned cond; | |
804 | union { | |
805 | ieee754dp d; | |
806 | ieee754sp s; | |
807 | int w; | |
766160c2 | 808 | #ifdef __mips64 |
1da177e4 LT |
809 | s64 l; |
810 | #endif | |
811 | } rv; /* resulting value */ | |
812 | ||
813 | fpuemuprivate.stats.cp1ops++; | |
814 | switch (rfmt = (MIPSInst_FFMT(ir) & 0xf)) { | |
815 | case s_fmt:{ /* 0 */ | |
816 | union { | |
817 | ieee754sp(*b) (ieee754sp, ieee754sp); | |
818 | ieee754sp(*u) (ieee754sp); | |
819 | } handler; | |
820 | ||
821 | switch (MIPSInst_FUNC(ir)) { | |
822 | /* binary ops */ | |
823 | case fadd_op: | |
824 | handler.b = ieee754sp_add; | |
825 | goto scopbop; | |
826 | case fsub_op: | |
827 | handler.b = ieee754sp_sub; | |
828 | goto scopbop; | |
829 | case fmul_op: | |
830 | handler.b = ieee754sp_mul; | |
831 | goto scopbop; | |
832 | case fdiv_op: | |
833 | handler.b = ieee754sp_div; | |
834 | goto scopbop; | |
835 | ||
836 | /* unary ops */ | |
837 | #if __mips >= 2 || __mips64 | |
838 | case fsqrt_op: | |
839 | handler.u = ieee754sp_sqrt; | |
840 | goto scopuop; | |
841 | #endif | |
842 | #if __mips >= 4 && __mips != 32 | |
843 | case frsqrt_op: | |
844 | handler.u = fpemu_sp_rsqrt; | |
845 | goto scopuop; | |
846 | case frecip_op: | |
847 | handler.u = fpemu_sp_recip; | |
848 | goto scopuop; | |
849 | #endif | |
850 | #if __mips >= 4 | |
851 | case fmovc_op: | |
852 | cond = fpucondbit[MIPSInst_FT(ir) >> 2]; | |
853 | if (((ctx->fcr31 & cond) != 0) != | |
854 | ((MIPSInst_FT(ir) & 1) != 0)) | |
855 | return 0; | |
856 | SPFROMREG(rv.s, MIPSInst_FS(ir)); | |
857 | break; | |
858 | case fmovz_op: | |
859 | if (xcp->regs[MIPSInst_FT(ir)] != 0) | |
860 | return 0; | |
861 | SPFROMREG(rv.s, MIPSInst_FS(ir)); | |
862 | break; | |
863 | case fmovn_op: | |
864 | if (xcp->regs[MIPSInst_FT(ir)] == 0) | |
865 | return 0; | |
866 | SPFROMREG(rv.s, MIPSInst_FS(ir)); | |
867 | break; | |
868 | #endif | |
869 | case fabs_op: | |
870 | handler.u = ieee754sp_abs; | |
871 | goto scopuop; | |
872 | case fneg_op: | |
873 | handler.u = ieee754sp_neg; | |
874 | goto scopuop; | |
875 | case fmov_op: | |
876 | /* an easy one */ | |
877 | SPFROMREG(rv.s, MIPSInst_FS(ir)); | |
878 | goto copcsr; | |
879 | ||
880 | /* binary op on handler */ | |
881 | scopbop: | |
882 | { | |
883 | ieee754sp fs, ft; | |
884 | ||
885 | SPFROMREG(fs, MIPSInst_FS(ir)); | |
886 | SPFROMREG(ft, MIPSInst_FT(ir)); | |
887 | ||
888 | rv.s = (*handler.b) (fs, ft); | |
889 | goto copcsr; | |
890 | } | |
891 | scopuop: | |
892 | { | |
893 | ieee754sp fs; | |
894 | ||
895 | SPFROMREG(fs, MIPSInst_FS(ir)); | |
896 | rv.s = (*handler.u) (fs); | |
897 | goto copcsr; | |
898 | } | |
899 | copcsr: | |
900 | if (ieee754_cxtest(IEEE754_INEXACT)) | |
901 | rcsr |= FPU_CSR_INE_X | FPU_CSR_INE_S; | |
902 | if (ieee754_cxtest(IEEE754_UNDERFLOW)) | |
903 | rcsr |= FPU_CSR_UDF_X | FPU_CSR_UDF_S; | |
904 | if (ieee754_cxtest(IEEE754_OVERFLOW)) | |
905 | rcsr |= FPU_CSR_OVF_X | FPU_CSR_OVF_S; | |
906 | if (ieee754_cxtest(IEEE754_ZERO_DIVIDE)) | |
907 | rcsr |= FPU_CSR_DIV_X | FPU_CSR_DIV_S; | |
908 | if (ieee754_cxtest(IEEE754_INVALID_OPERATION)) | |
909 | rcsr |= FPU_CSR_INV_X | FPU_CSR_INV_S; | |
910 | break; | |
911 | ||
912 | /* unary conv ops */ | |
913 | case fcvts_op: | |
914 | return SIGILL; /* not defined */ | |
915 | case fcvtd_op:{ | |
916 | #ifdef SINGLE_ONLY_FPU | |
917 | return SIGILL; /* not defined */ | |
918 | #else | |
919 | ieee754sp fs; | |
920 | ||
921 | SPFROMREG(fs, MIPSInst_FS(ir)); | |
922 | rv.d = ieee754dp_fsp(fs); | |
923 | rfmt = d_fmt; | |
924 | goto copcsr; | |
925 | } | |
926 | #endif | |
927 | case fcvtw_op:{ | |
928 | ieee754sp fs; | |
929 | ||
930 | SPFROMREG(fs, MIPSInst_FS(ir)); | |
931 | rv.w = ieee754sp_tint(fs); | |
932 | rfmt = w_fmt; | |
933 | goto copcsr; | |
934 | } | |
935 | ||
936 | #if __mips >= 2 || __mips64 | |
937 | case fround_op: | |
938 | case ftrunc_op: | |
939 | case fceil_op: | |
940 | case ffloor_op:{ | |
941 | unsigned int oldrm = ieee754_csr.rm; | |
942 | ieee754sp fs; | |
943 | ||
944 | SPFROMREG(fs, MIPSInst_FS(ir)); | |
945 | ieee754_csr.rm = ieee_rm[MIPSInst_FUNC(ir) & 0x3]; | |
946 | rv.w = ieee754sp_tint(fs); | |
947 | ieee754_csr.rm = oldrm; | |
948 | rfmt = w_fmt; | |
949 | goto copcsr; | |
950 | } | |
951 | #endif /* __mips >= 2 */ | |
952 | ||
766160c2 | 953 | #if defined(__mips64) && !defined(SINGLE_ONLY_FPU) |
1da177e4 LT |
954 | case fcvtl_op:{ |
955 | ieee754sp fs; | |
956 | ||
957 | SPFROMREG(fs, MIPSInst_FS(ir)); | |
958 | rv.l = ieee754sp_tlong(fs); | |
959 | rfmt = l_fmt; | |
960 | goto copcsr; | |
961 | } | |
962 | ||
963 | case froundl_op: | |
964 | case ftruncl_op: | |
965 | case fceill_op: | |
966 | case ffloorl_op:{ | |
967 | unsigned int oldrm = ieee754_csr.rm; | |
968 | ieee754sp fs; | |
969 | ||
970 | SPFROMREG(fs, MIPSInst_FS(ir)); | |
971 | ieee754_csr.rm = ieee_rm[MIPSInst_FUNC(ir) & 0x3]; | |
972 | rv.l = ieee754sp_tlong(fs); | |
973 | ieee754_csr.rm = oldrm; | |
974 | rfmt = l_fmt; | |
975 | goto copcsr; | |
976 | } | |
977 | #endif /* __mips64 && !fpu(single) */ | |
978 | ||
979 | default: | |
980 | if (MIPSInst_FUNC(ir) >= fcmp_op) { | |
981 | unsigned cmpop = MIPSInst_FUNC(ir) - fcmp_op; | |
982 | ieee754sp fs, ft; | |
983 | ||
984 | SPFROMREG(fs, MIPSInst_FS(ir)); | |
985 | SPFROMREG(ft, MIPSInst_FT(ir)); | |
986 | rv.w = ieee754sp_cmp(fs, ft, | |
987 | cmptab[cmpop & 0x7], cmpop & 0x8); | |
988 | rfmt = -1; | |
989 | if ((cmpop & 0x8) && ieee754_cxtest | |
990 | (IEEE754_INVALID_OPERATION)) | |
991 | rcsr = FPU_CSR_INV_X | FPU_CSR_INV_S; | |
992 | else | |
993 | goto copcsr; | |
994 | ||
995 | } | |
996 | else { | |
997 | return SIGILL; | |
998 | } | |
999 | break; | |
1000 | } | |
1001 | break; | |
1002 | } | |
1003 | ||
1004 | #ifndef SINGLE_ONLY_FPU | |
1005 | case d_fmt:{ | |
1006 | union { | |
1007 | ieee754dp(*b) (ieee754dp, ieee754dp); | |
1008 | ieee754dp(*u) (ieee754dp); | |
1009 | } handler; | |
1010 | ||
1011 | switch (MIPSInst_FUNC(ir)) { | |
1012 | /* binary ops */ | |
1013 | case fadd_op: | |
1014 | handler.b = ieee754dp_add; | |
1015 | goto dcopbop; | |
1016 | case fsub_op: | |
1017 | handler.b = ieee754dp_sub; | |
1018 | goto dcopbop; | |
1019 | case fmul_op: | |
1020 | handler.b = ieee754dp_mul; | |
1021 | goto dcopbop; | |
1022 | case fdiv_op: | |
1023 | handler.b = ieee754dp_div; | |
1024 | goto dcopbop; | |
1025 | ||
1026 | /* unary ops */ | |
1027 | #if __mips >= 2 || __mips64 | |
1028 | case fsqrt_op: | |
1029 | handler.u = ieee754dp_sqrt; | |
1030 | goto dcopuop; | |
1031 | #endif | |
1032 | #if __mips >= 4 && __mips != 32 | |
1033 | case frsqrt_op: | |
1034 | handler.u = fpemu_dp_rsqrt; | |
1035 | goto dcopuop; | |
1036 | case frecip_op: | |
1037 | handler.u = fpemu_dp_recip; | |
1038 | goto dcopuop; | |
1039 | #endif | |
1040 | #if __mips >= 4 | |
1041 | case fmovc_op: | |
1042 | cond = fpucondbit[MIPSInst_FT(ir) >> 2]; | |
1043 | if (((ctx->fcr31 & cond) != 0) != | |
1044 | ((MIPSInst_FT(ir) & 1) != 0)) | |
1045 | return 0; | |
1046 | DPFROMREG(rv.d, MIPSInst_FS(ir)); | |
1047 | break; | |
1048 | case fmovz_op: | |
1049 | if (xcp->regs[MIPSInst_FT(ir)] != 0) | |
1050 | return 0; | |
1051 | DPFROMREG(rv.d, MIPSInst_FS(ir)); | |
1052 | break; | |
1053 | case fmovn_op: | |
1054 | if (xcp->regs[MIPSInst_FT(ir)] == 0) | |
1055 | return 0; | |
1056 | DPFROMREG(rv.d, MIPSInst_FS(ir)); | |
1057 | break; | |
1058 | #endif | |
1059 | case fabs_op: | |
1060 | handler.u = ieee754dp_abs; | |
1061 | goto dcopuop; | |
1062 | ||
1063 | case fneg_op: | |
1064 | handler.u = ieee754dp_neg; | |
1065 | goto dcopuop; | |
1066 | ||
1067 | case fmov_op: | |
1068 | /* an easy one */ | |
1069 | DPFROMREG(rv.d, MIPSInst_FS(ir)); | |
1070 | goto copcsr; | |
1071 | ||
1072 | /* binary op on handler */ | |
1073 | dcopbop:{ | |
1074 | ieee754dp fs, ft; | |
1075 | ||
1076 | DPFROMREG(fs, MIPSInst_FS(ir)); | |
1077 | DPFROMREG(ft, MIPSInst_FT(ir)); | |
1078 | ||
1079 | rv.d = (*handler.b) (fs, ft); | |
1080 | goto copcsr; | |
1081 | } | |
1082 | dcopuop:{ | |
1083 | ieee754dp fs; | |
1084 | ||
1085 | DPFROMREG(fs, MIPSInst_FS(ir)); | |
1086 | rv.d = (*handler.u) (fs); | |
1087 | goto copcsr; | |
1088 | } | |
1089 | ||
1090 | /* unary conv ops */ | |
1091 | case fcvts_op:{ | |
1092 | ieee754dp fs; | |
1093 | ||
1094 | DPFROMREG(fs, MIPSInst_FS(ir)); | |
1095 | rv.s = ieee754sp_fdp(fs); | |
1096 | rfmt = s_fmt; | |
1097 | goto copcsr; | |
1098 | } | |
1099 | case fcvtd_op: | |
1100 | return SIGILL; /* not defined */ | |
1101 | ||
1102 | case fcvtw_op:{ | |
1103 | ieee754dp fs; | |
1104 | ||
1105 | DPFROMREG(fs, MIPSInst_FS(ir)); | |
1106 | rv.w = ieee754dp_tint(fs); /* wrong */ | |
1107 | rfmt = w_fmt; | |
1108 | goto copcsr; | |
1109 | } | |
1110 | ||
1111 | #if __mips >= 2 || __mips64 | |
1112 | case fround_op: | |
1113 | case ftrunc_op: | |
1114 | case fceil_op: | |
1115 | case ffloor_op:{ | |
1116 | unsigned int oldrm = ieee754_csr.rm; | |
1117 | ieee754dp fs; | |
1118 | ||
1119 | DPFROMREG(fs, MIPSInst_FS(ir)); | |
1120 | ieee754_csr.rm = ieee_rm[MIPSInst_FUNC(ir) & 0x3]; | |
1121 | rv.w = ieee754dp_tint(fs); | |
1122 | ieee754_csr.rm = oldrm; | |
1123 | rfmt = w_fmt; | |
1124 | goto copcsr; | |
1125 | } | |
1126 | #endif | |
1127 | ||
766160c2 | 1128 | #if defined(__mips64) && !defined(SINGLE_ONLY_FPU) |
1da177e4 LT |
1129 | case fcvtl_op:{ |
1130 | ieee754dp fs; | |
1131 | ||
1132 | DPFROMREG(fs, MIPSInst_FS(ir)); | |
1133 | rv.l = ieee754dp_tlong(fs); | |
1134 | rfmt = l_fmt; | |
1135 | goto copcsr; | |
1136 | } | |
1137 | ||
1138 | case froundl_op: | |
1139 | case ftruncl_op: | |
1140 | case fceill_op: | |
1141 | case ffloorl_op:{ | |
1142 | unsigned int oldrm = ieee754_csr.rm; | |
1143 | ieee754dp fs; | |
1144 | ||
1145 | DPFROMREG(fs, MIPSInst_FS(ir)); | |
1146 | ieee754_csr.rm = ieee_rm[MIPSInst_FUNC(ir) & 0x3]; | |
1147 | rv.l = ieee754dp_tlong(fs); | |
1148 | ieee754_csr.rm = oldrm; | |
1149 | rfmt = l_fmt; | |
1150 | goto copcsr; | |
1151 | } | |
1152 | #endif /* __mips >= 3 && !fpu(single) */ | |
1153 | ||
1154 | default: | |
1155 | if (MIPSInst_FUNC(ir) >= fcmp_op) { | |
1156 | unsigned cmpop = MIPSInst_FUNC(ir) - fcmp_op; | |
1157 | ieee754dp fs, ft; | |
1158 | ||
1159 | DPFROMREG(fs, MIPSInst_FS(ir)); | |
1160 | DPFROMREG(ft, MIPSInst_FT(ir)); | |
1161 | rv.w = ieee754dp_cmp(fs, ft, | |
1162 | cmptab[cmpop & 0x7], cmpop & 0x8); | |
1163 | rfmt = -1; | |
1164 | if ((cmpop & 0x8) | |
1165 | && | |
1166 | ieee754_cxtest | |
1167 | (IEEE754_INVALID_OPERATION)) | |
1168 | rcsr = FPU_CSR_INV_X | FPU_CSR_INV_S; | |
1169 | else | |
1170 | goto copcsr; | |
1171 | ||
1172 | } | |
1173 | else { | |
1174 | return SIGILL; | |
1175 | } | |
1176 | break; | |
1177 | } | |
1178 | break; | |
1179 | } | |
1180 | #endif /* ifndef SINGLE_ONLY_FPU */ | |
1181 | ||
1182 | case w_fmt:{ | |
1183 | ieee754sp fs; | |
1184 | ||
1185 | switch (MIPSInst_FUNC(ir)) { | |
1186 | case fcvts_op: | |
1187 | /* convert word to single precision real */ | |
1188 | SPFROMREG(fs, MIPSInst_FS(ir)); | |
1189 | rv.s = ieee754sp_fint(fs.bits); | |
1190 | rfmt = s_fmt; | |
1191 | goto copcsr; | |
1192 | #ifndef SINGLE_ONLY_FPU | |
1193 | case fcvtd_op: | |
1194 | /* convert word to double precision real */ | |
1195 | SPFROMREG(fs, MIPSInst_FS(ir)); | |
1196 | rv.d = ieee754dp_fint(fs.bits); | |
1197 | rfmt = d_fmt; | |
1198 | goto copcsr; | |
1199 | #endif | |
1200 | default: | |
1201 | return SIGILL; | |
1202 | } | |
1203 | break; | |
1204 | } | |
1205 | ||
766160c2 | 1206 | #if defined(__mips64) && !defined(SINGLE_ONLY_FPU) |
1da177e4 LT |
1207 | case l_fmt:{ |
1208 | switch (MIPSInst_FUNC(ir)) { | |
1209 | case fcvts_op: | |
1210 | /* convert long to single precision real */ | |
1211 | rv.s = ieee754sp_flong(ctx->fpr[MIPSInst_FS(ir)]); | |
1212 | rfmt = s_fmt; | |
1213 | goto copcsr; | |
1214 | case fcvtd_op: | |
1215 | /* convert long to double precision real */ | |
1216 | rv.d = ieee754dp_flong(ctx->fpr[MIPSInst_FS(ir)]); | |
1217 | rfmt = d_fmt; | |
1218 | goto copcsr; | |
1219 | default: | |
1220 | return SIGILL; | |
1221 | } | |
1222 | break; | |
1223 | } | |
1224 | #endif | |
1225 | ||
1226 | default: | |
1227 | return SIGILL; | |
1228 | } | |
1229 | ||
1230 | /* | |
1231 | * Update the fpu CSR register for this operation. | |
1232 | * If an exception is required, generate a tidy SIGFPE exception, | |
1233 | * without updating the result register. | |
1234 | * Note: cause exception bits do not accumulate, they are rewritten | |
1235 | * for each op; only the flag/sticky bits accumulate. | |
1236 | */ | |
1237 | ctx->fcr31 = (ctx->fcr31 & ~FPU_CSR_ALL_X) | rcsr; | |
1238 | if ((ctx->fcr31 >> 5) & ctx->fcr31 & FPU_CSR_ALL_E) { | |
1239 | /*printk ("SIGFPE: fpu csr = %08x\n",ctx->fcr31); */ | |
1240 | return SIGFPE; | |
1241 | } | |
1242 | ||
1243 | /* | |
1244 | * Now we can safely write the result back to the register file. | |
1245 | */ | |
1246 | switch (rfmt) { | |
1247 | case -1:{ | |
1248 | #if __mips >= 4 | |
1249 | cond = fpucondbit[MIPSInst_FD(ir) >> 2]; | |
1250 | #else | |
1251 | cond = FPU_CSR_COND; | |
1252 | #endif | |
1253 | if (rv.w) | |
1254 | ctx->fcr31 |= cond; | |
1255 | else | |
1256 | ctx->fcr31 &= ~cond; | |
1257 | break; | |
1258 | } | |
1259 | #ifndef SINGLE_ONLY_FPU | |
1260 | case d_fmt: | |
1261 | DPTOREG(rv.d, MIPSInst_FD(ir)); | |
1262 | break; | |
1263 | #endif | |
1264 | case s_fmt: | |
1265 | SPTOREG(rv.s, MIPSInst_FD(ir)); | |
1266 | break; | |
1267 | case w_fmt: | |
1268 | SITOREG(rv.w, MIPSInst_FD(ir)); | |
1269 | break; | |
766160c2 | 1270 | #if defined(__mips64) && !defined(SINGLE_ONLY_FPU) |
1da177e4 LT |
1271 | case l_fmt: |
1272 | DITOREG(rv.l, MIPSInst_FD(ir)); | |
1273 | break; | |
1274 | #endif | |
1275 | default: | |
1276 | return SIGILL; | |
1277 | } | |
1278 | ||
1279 | return 0; | |
1280 | } | |
1281 | ||
1282 | int fpu_emulator_cop1Handler(int xcptno, struct pt_regs *xcp, | |
1283 | struct mips_fpu_soft_struct *ctx) | |
1284 | { | |
333d1f67 | 1285 | unsigned long oldepc, prevepc; |
1da177e4 LT |
1286 | mips_instruction insn; |
1287 | int sig = 0; | |
1288 | ||
1289 | oldepc = xcp->cp0_epc; | |
1290 | do { | |
1291 | prevepc = xcp->cp0_epc; | |
1292 | ||
1293 | if (get_user(insn, (mips_instruction *) xcp->cp0_epc)) { | |
1294 | fpuemuprivate.stats.errors++; | |
1295 | return SIGBUS; | |
1296 | } | |
1297 | if (insn == 0) | |
1298 | xcp->cp0_epc += 4; /* skip nops */ | |
1299 | else { | |
1300 | /* Update ieee754_csr. Only relevant if we have a | |
1301 | h/w FPU */ | |
1302 | ieee754_csr.nod = (ctx->fcr31 & 0x1000000) != 0; | |
1303 | ieee754_csr.rm = ieee_rm[ctx->fcr31 & 0x3]; | |
1304 | ieee754_csr.cx = (ctx->fcr31 >> 12) & 0x1f; | |
1305 | sig = cop1Emulate(xcp, ctx); | |
1306 | } | |
1307 | ||
1308 | if (cpu_has_fpu) | |
1309 | break; | |
1310 | if (sig) | |
1311 | break; | |
1312 | ||
1313 | cond_resched(); | |
1314 | } while (xcp->cp0_epc > prevepc); | |
1315 | ||
1316 | /* SIGILL indicates a non-fpu instruction */ | |
1317 | if (sig == SIGILL && xcp->cp0_epc != oldepc) | |
1318 | /* but if epc has advanced, then ignore it */ | |
1319 | sig = 0; | |
1320 | ||
1321 | return sig; | |
1322 | } |