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Commit | Line | Data |
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1da177e4 | 1 | /* |
3f7cac41 | 2 | * cp1emu.c: a MIPS coprocessor 1 (FPU) instruction emulator |
1da177e4 LT |
3 | * |
4 | * MIPS floating point support | |
5 | * Copyright (C) 1994-2000 Algorithmics Ltd. | |
1da177e4 LT |
6 | * |
7 | * Kevin D. Kissell, kevink@mips.com and Carsten Langgaard, carstenl@mips.com | |
8 | * Copyright (C) 2000 MIPS Technologies, Inc. | |
9 | * | |
10 | * This program is free software; you can distribute it and/or modify it | |
11 | * under the terms of the GNU General Public License (Version 2) as | |
12 | * published by the Free Software Foundation. | |
13 | * | |
14 | * This program is distributed in the hope it will be useful, but WITHOUT | |
15 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
16 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
17 | * for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License along | |
20 | * with this program; if not, write to the Free Software Foundation, Inc., | |
3f7cac41 | 21 | * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
1da177e4 LT |
22 | * |
23 | * A complete emulator for MIPS coprocessor 1 instructions. This is | |
24 | * required for #float(switch) or #float(trap), where it catches all | |
25 | * COP1 instructions via the "CoProcessor Unusable" exception. | |
26 | * | |
27 | * More surprisingly it is also required for #float(ieee), to help out | |
3f7cac41 | 28 | * the hardware FPU at the boundaries of the IEEE-754 representation |
1da177e4 LT |
29 | * (denormalised values, infinities, underflow, etc). It is made |
30 | * quite nasty because emulation of some non-COP1 instructions is | |
31 | * required, e.g. in branch delay slots. | |
32 | * | |
3f7cac41 | 33 | * Note if you know that you won't have an FPU, then you'll get much |
1da177e4 LT |
34 | * better performance by compiling with -msoft-float! |
35 | */ | |
36 | #include <linux/sched.h> | |
83fd38ca | 37 | #include <linux/debugfs.h> |
08a07904 | 38 | #include <linux/kconfig.h> |
85c51c51 | 39 | #include <linux/percpu-defs.h> |
7f788d2d | 40 | #include <linux/perf_event.h> |
1da177e4 | 41 | |
cd8ee345 | 42 | #include <asm/branch.h> |
1da177e4 | 43 | #include <asm/inst.h> |
1da177e4 LT |
44 | #include <asm/ptrace.h> |
45 | #include <asm/signal.h> | |
cd8ee345 RB |
46 | #include <asm/uaccess.h> |
47 | ||
f6843626 | 48 | #include <asm/cpu-info.h> |
cd8ee345 | 49 | #include <asm/processor.h> |
1da177e4 | 50 | #include <asm/fpu_emulator.h> |
102cedc3 | 51 | #include <asm/fpu.h> |
b0a668fb | 52 | #include <asm/mips-r2-to-r6-emul.h> |
1da177e4 LT |
53 | |
54 | #include "ieee754.h" | |
1da177e4 | 55 | |
1da177e4 LT |
56 | /* Function which emulates a floating point instruction. */ |
57 | ||
eae89076 | 58 | static int fpu_emu(struct pt_regs *, struct mips_fpu_struct *, |
1da177e4 LT |
59 | mips_instruction); |
60 | ||
1da177e4 | 61 | static int fpux_emu(struct pt_regs *, |
515b029d | 62 | struct mips_fpu_struct *, mips_instruction, void *__user *); |
1da177e4 | 63 | |
1da177e4 LT |
64 | /* Control registers */ |
65 | ||
66 | #define FPCREG_RID 0 /* $0 = revision id */ | |
c491cfa2 MR |
67 | #define FPCREG_FCCR 25 /* $25 = fccr */ |
68 | #define FPCREG_FEXR 26 /* $26 = fexr */ | |
69 | #define FPCREG_FENR 28 /* $28 = fenr */ | |
1da177e4 LT |
70 | #define FPCREG_CSR 31 /* $31 = csr */ |
71 | ||
1da177e4 | 72 | /* convert condition code register number to csr bit */ |
b0a668fb | 73 | const unsigned int fpucondbit[8] = { |
c491cfa2 | 74 | FPU_CSR_COND, |
1da177e4 LT |
75 | FPU_CSR_COND1, |
76 | FPU_CSR_COND2, | |
77 | FPU_CSR_COND3, | |
78 | FPU_CSR_COND4, | |
79 | FPU_CSR_COND5, | |
80 | FPU_CSR_COND6, | |
81 | FPU_CSR_COND7 | |
82 | }; | |
1da177e4 | 83 | |
102cedc3 LY |
84 | /* (microMIPS) Convert certain microMIPS instructions to MIPS32 format. */ |
85 | static const int sd_format[] = {16, 17, 0, 0, 0, 0, 0, 0}; | |
86 | static const int sdps_format[] = {16, 17, 22, 0, 0, 0, 0, 0}; | |
87 | static const int dwl_format[] = {17, 20, 21, 0, 0, 0, 0, 0}; | |
88 | static const int swl_format[] = {16, 20, 21, 0, 0, 0, 0, 0}; | |
89 | ||
90 | /* | |
91 | * This functions translates a 32-bit microMIPS instruction | |
92 | * into a 32-bit MIPS32 instruction. Returns 0 on success | |
93 | * and SIGILL otherwise. | |
94 | */ | |
95 | static int microMIPS32_to_MIPS32(union mips_instruction *insn_ptr) | |
96 | { | |
97 | union mips_instruction insn = *insn_ptr; | |
98 | union mips_instruction mips32_insn = insn; | |
99 | int func, fmt, op; | |
100 | ||
101 | switch (insn.mm_i_format.opcode) { | |
102 | case mm_ldc132_op: | |
103 | mips32_insn.mm_i_format.opcode = ldc1_op; | |
104 | mips32_insn.mm_i_format.rt = insn.mm_i_format.rs; | |
105 | mips32_insn.mm_i_format.rs = insn.mm_i_format.rt; | |
106 | break; | |
107 | case mm_lwc132_op: | |
108 | mips32_insn.mm_i_format.opcode = lwc1_op; | |
109 | mips32_insn.mm_i_format.rt = insn.mm_i_format.rs; | |
110 | mips32_insn.mm_i_format.rs = insn.mm_i_format.rt; | |
111 | break; | |
112 | case mm_sdc132_op: | |
113 | mips32_insn.mm_i_format.opcode = sdc1_op; | |
114 | mips32_insn.mm_i_format.rt = insn.mm_i_format.rs; | |
115 | mips32_insn.mm_i_format.rs = insn.mm_i_format.rt; | |
116 | break; | |
117 | case mm_swc132_op: | |
118 | mips32_insn.mm_i_format.opcode = swc1_op; | |
119 | mips32_insn.mm_i_format.rt = insn.mm_i_format.rs; | |
120 | mips32_insn.mm_i_format.rs = insn.mm_i_format.rt; | |
121 | break; | |
122 | case mm_pool32i_op: | |
123 | /* NOTE: offset is << by 1 if in microMIPS mode. */ | |
124 | if ((insn.mm_i_format.rt == mm_bc1f_op) || | |
125 | (insn.mm_i_format.rt == mm_bc1t_op)) { | |
126 | mips32_insn.fb_format.opcode = cop1_op; | |
127 | mips32_insn.fb_format.bc = bc_op; | |
128 | mips32_insn.fb_format.flag = | |
129 | (insn.mm_i_format.rt == mm_bc1t_op) ? 1 : 0; | |
130 | } else | |
131 | return SIGILL; | |
132 | break; | |
133 | case mm_pool32f_op: | |
134 | switch (insn.mm_fp0_format.func) { | |
135 | case mm_32f_01_op: | |
136 | case mm_32f_11_op: | |
137 | case mm_32f_02_op: | |
138 | case mm_32f_12_op: | |
139 | case mm_32f_41_op: | |
140 | case mm_32f_51_op: | |
141 | case mm_32f_42_op: | |
142 | case mm_32f_52_op: | |
143 | op = insn.mm_fp0_format.func; | |
144 | if (op == mm_32f_01_op) | |
145 | func = madd_s_op; | |
146 | else if (op == mm_32f_11_op) | |
147 | func = madd_d_op; | |
148 | else if (op == mm_32f_02_op) | |
149 | func = nmadd_s_op; | |
150 | else if (op == mm_32f_12_op) | |
151 | func = nmadd_d_op; | |
152 | else if (op == mm_32f_41_op) | |
153 | func = msub_s_op; | |
154 | else if (op == mm_32f_51_op) | |
155 | func = msub_d_op; | |
156 | else if (op == mm_32f_42_op) | |
157 | func = nmsub_s_op; | |
158 | else | |
159 | func = nmsub_d_op; | |
160 | mips32_insn.fp6_format.opcode = cop1x_op; | |
161 | mips32_insn.fp6_format.fr = insn.mm_fp6_format.fr; | |
162 | mips32_insn.fp6_format.ft = insn.mm_fp6_format.ft; | |
163 | mips32_insn.fp6_format.fs = insn.mm_fp6_format.fs; | |
164 | mips32_insn.fp6_format.fd = insn.mm_fp6_format.fd; | |
165 | mips32_insn.fp6_format.func = func; | |
166 | break; | |
167 | case mm_32f_10_op: | |
168 | func = -1; /* Invalid */ | |
169 | op = insn.mm_fp5_format.op & 0x7; | |
170 | if (op == mm_ldxc1_op) | |
171 | func = ldxc1_op; | |
172 | else if (op == mm_sdxc1_op) | |
173 | func = sdxc1_op; | |
174 | else if (op == mm_lwxc1_op) | |
175 | func = lwxc1_op; | |
176 | else if (op == mm_swxc1_op) | |
177 | func = swxc1_op; | |
178 | ||
179 | if (func != -1) { | |
180 | mips32_insn.r_format.opcode = cop1x_op; | |
181 | mips32_insn.r_format.rs = | |
182 | insn.mm_fp5_format.base; | |
183 | mips32_insn.r_format.rt = | |
184 | insn.mm_fp5_format.index; | |
185 | mips32_insn.r_format.rd = 0; | |
186 | mips32_insn.r_format.re = insn.mm_fp5_format.fd; | |
187 | mips32_insn.r_format.func = func; | |
188 | } else | |
189 | return SIGILL; | |
190 | break; | |
191 | case mm_32f_40_op: | |
192 | op = -1; /* Invalid */ | |
193 | if (insn.mm_fp2_format.op == mm_fmovt_op) | |
194 | op = 1; | |
195 | else if (insn.mm_fp2_format.op == mm_fmovf_op) | |
196 | op = 0; | |
197 | if (op != -1) { | |
198 | mips32_insn.fp0_format.opcode = cop1_op; | |
199 | mips32_insn.fp0_format.fmt = | |
200 | sdps_format[insn.mm_fp2_format.fmt]; | |
201 | mips32_insn.fp0_format.ft = | |
202 | (insn.mm_fp2_format.cc<<2) + op; | |
203 | mips32_insn.fp0_format.fs = | |
204 | insn.mm_fp2_format.fs; | |
205 | mips32_insn.fp0_format.fd = | |
206 | insn.mm_fp2_format.fd; | |
207 | mips32_insn.fp0_format.func = fmovc_op; | |
208 | } else | |
209 | return SIGILL; | |
210 | break; | |
211 | case mm_32f_60_op: | |
212 | func = -1; /* Invalid */ | |
213 | if (insn.mm_fp0_format.op == mm_fadd_op) | |
214 | func = fadd_op; | |
215 | else if (insn.mm_fp0_format.op == mm_fsub_op) | |
216 | func = fsub_op; | |
217 | else if (insn.mm_fp0_format.op == mm_fmul_op) | |
218 | func = fmul_op; | |
219 | else if (insn.mm_fp0_format.op == mm_fdiv_op) | |
220 | func = fdiv_op; | |
221 | if (func != -1) { | |
222 | mips32_insn.fp0_format.opcode = cop1_op; | |
223 | mips32_insn.fp0_format.fmt = | |
224 | sdps_format[insn.mm_fp0_format.fmt]; | |
225 | mips32_insn.fp0_format.ft = | |
226 | insn.mm_fp0_format.ft; | |
227 | mips32_insn.fp0_format.fs = | |
228 | insn.mm_fp0_format.fs; | |
229 | mips32_insn.fp0_format.fd = | |
230 | insn.mm_fp0_format.fd; | |
231 | mips32_insn.fp0_format.func = func; | |
232 | } else | |
233 | return SIGILL; | |
234 | break; | |
235 | case mm_32f_70_op: | |
236 | func = -1; /* Invalid */ | |
237 | if (insn.mm_fp0_format.op == mm_fmovn_op) | |
238 | func = fmovn_op; | |
239 | else if (insn.mm_fp0_format.op == mm_fmovz_op) | |
240 | func = fmovz_op; | |
241 | if (func != -1) { | |
242 | mips32_insn.fp0_format.opcode = cop1_op; | |
243 | mips32_insn.fp0_format.fmt = | |
244 | sdps_format[insn.mm_fp0_format.fmt]; | |
245 | mips32_insn.fp0_format.ft = | |
246 | insn.mm_fp0_format.ft; | |
247 | mips32_insn.fp0_format.fs = | |
248 | insn.mm_fp0_format.fs; | |
249 | mips32_insn.fp0_format.fd = | |
250 | insn.mm_fp0_format.fd; | |
251 | mips32_insn.fp0_format.func = func; | |
252 | } else | |
253 | return SIGILL; | |
254 | break; | |
255 | case mm_32f_73_op: /* POOL32FXF */ | |
256 | switch (insn.mm_fp1_format.op) { | |
257 | case mm_movf0_op: | |
258 | case mm_movf1_op: | |
259 | case mm_movt0_op: | |
260 | case mm_movt1_op: | |
261 | if ((insn.mm_fp1_format.op & 0x7f) == | |
262 | mm_movf0_op) | |
263 | op = 0; | |
264 | else | |
265 | op = 1; | |
266 | mips32_insn.r_format.opcode = spec_op; | |
267 | mips32_insn.r_format.rs = insn.mm_fp4_format.fs; | |
268 | mips32_insn.r_format.rt = | |
269 | (insn.mm_fp4_format.cc << 2) + op; | |
270 | mips32_insn.r_format.rd = insn.mm_fp4_format.rt; | |
271 | mips32_insn.r_format.re = 0; | |
272 | mips32_insn.r_format.func = movc_op; | |
273 | break; | |
274 | case mm_fcvtd0_op: | |
275 | case mm_fcvtd1_op: | |
276 | case mm_fcvts0_op: | |
277 | case mm_fcvts1_op: | |
278 | if ((insn.mm_fp1_format.op & 0x7f) == | |
279 | mm_fcvtd0_op) { | |
280 | func = fcvtd_op; | |
281 | fmt = swl_format[insn.mm_fp3_format.fmt]; | |
282 | } else { | |
283 | func = fcvts_op; | |
284 | fmt = dwl_format[insn.mm_fp3_format.fmt]; | |
285 | } | |
286 | mips32_insn.fp0_format.opcode = cop1_op; | |
287 | mips32_insn.fp0_format.fmt = fmt; | |
288 | mips32_insn.fp0_format.ft = 0; | |
289 | mips32_insn.fp0_format.fs = | |
290 | insn.mm_fp3_format.fs; | |
291 | mips32_insn.fp0_format.fd = | |
292 | insn.mm_fp3_format.rt; | |
293 | mips32_insn.fp0_format.func = func; | |
294 | break; | |
295 | case mm_fmov0_op: | |
296 | case mm_fmov1_op: | |
297 | case mm_fabs0_op: | |
298 | case mm_fabs1_op: | |
299 | case mm_fneg0_op: | |
300 | case mm_fneg1_op: | |
301 | if ((insn.mm_fp1_format.op & 0x7f) == | |
302 | mm_fmov0_op) | |
303 | func = fmov_op; | |
304 | else if ((insn.mm_fp1_format.op & 0x7f) == | |
305 | mm_fabs0_op) | |
306 | func = fabs_op; | |
307 | else | |
308 | func = fneg_op; | |
309 | mips32_insn.fp0_format.opcode = cop1_op; | |
310 | mips32_insn.fp0_format.fmt = | |
311 | sdps_format[insn.mm_fp3_format.fmt]; | |
312 | mips32_insn.fp0_format.ft = 0; | |
313 | mips32_insn.fp0_format.fs = | |
314 | insn.mm_fp3_format.fs; | |
315 | mips32_insn.fp0_format.fd = | |
316 | insn.mm_fp3_format.rt; | |
317 | mips32_insn.fp0_format.func = func; | |
318 | break; | |
319 | case mm_ffloorl_op: | |
320 | case mm_ffloorw_op: | |
321 | case mm_fceill_op: | |
322 | case mm_fceilw_op: | |
323 | case mm_ftruncl_op: | |
324 | case mm_ftruncw_op: | |
325 | case mm_froundl_op: | |
326 | case mm_froundw_op: | |
327 | case mm_fcvtl_op: | |
328 | case mm_fcvtw_op: | |
329 | if (insn.mm_fp1_format.op == mm_ffloorl_op) | |
330 | func = ffloorl_op; | |
331 | else if (insn.mm_fp1_format.op == mm_ffloorw_op) | |
332 | func = ffloor_op; | |
333 | else if (insn.mm_fp1_format.op == mm_fceill_op) | |
334 | func = fceill_op; | |
335 | else if (insn.mm_fp1_format.op == mm_fceilw_op) | |
336 | func = fceil_op; | |
337 | else if (insn.mm_fp1_format.op == mm_ftruncl_op) | |
338 | func = ftruncl_op; | |
339 | else if (insn.mm_fp1_format.op == mm_ftruncw_op) | |
340 | func = ftrunc_op; | |
341 | else if (insn.mm_fp1_format.op == mm_froundl_op) | |
342 | func = froundl_op; | |
343 | else if (insn.mm_fp1_format.op == mm_froundw_op) | |
344 | func = fround_op; | |
345 | else if (insn.mm_fp1_format.op == mm_fcvtl_op) | |
346 | func = fcvtl_op; | |
347 | else | |
348 | func = fcvtw_op; | |
349 | mips32_insn.fp0_format.opcode = cop1_op; | |
350 | mips32_insn.fp0_format.fmt = | |
351 | sd_format[insn.mm_fp1_format.fmt]; | |
352 | mips32_insn.fp0_format.ft = 0; | |
353 | mips32_insn.fp0_format.fs = | |
354 | insn.mm_fp1_format.fs; | |
355 | mips32_insn.fp0_format.fd = | |
356 | insn.mm_fp1_format.rt; | |
357 | mips32_insn.fp0_format.func = func; | |
358 | break; | |
359 | case mm_frsqrt_op: | |
360 | case mm_fsqrt_op: | |
361 | case mm_frecip_op: | |
362 | if (insn.mm_fp1_format.op == mm_frsqrt_op) | |
363 | func = frsqrt_op; | |
364 | else if (insn.mm_fp1_format.op == mm_fsqrt_op) | |
365 | func = fsqrt_op; | |
366 | else | |
367 | func = frecip_op; | |
368 | mips32_insn.fp0_format.opcode = cop1_op; | |
369 | mips32_insn.fp0_format.fmt = | |
370 | sdps_format[insn.mm_fp1_format.fmt]; | |
371 | mips32_insn.fp0_format.ft = 0; | |
372 | mips32_insn.fp0_format.fs = | |
373 | insn.mm_fp1_format.fs; | |
374 | mips32_insn.fp0_format.fd = | |
375 | insn.mm_fp1_format.rt; | |
376 | mips32_insn.fp0_format.func = func; | |
377 | break; | |
378 | case mm_mfc1_op: | |
379 | case mm_mtc1_op: | |
380 | case mm_cfc1_op: | |
381 | case mm_ctc1_op: | |
9355e59c SH |
382 | case mm_mfhc1_op: |
383 | case mm_mthc1_op: | |
102cedc3 LY |
384 | if (insn.mm_fp1_format.op == mm_mfc1_op) |
385 | op = mfc_op; | |
386 | else if (insn.mm_fp1_format.op == mm_mtc1_op) | |
387 | op = mtc_op; | |
388 | else if (insn.mm_fp1_format.op == mm_cfc1_op) | |
389 | op = cfc_op; | |
9355e59c | 390 | else if (insn.mm_fp1_format.op == mm_ctc1_op) |
102cedc3 | 391 | op = ctc_op; |
9355e59c SH |
392 | else if (insn.mm_fp1_format.op == mm_mfhc1_op) |
393 | op = mfhc_op; | |
394 | else | |
395 | op = mthc_op; | |
102cedc3 LY |
396 | mips32_insn.fp1_format.opcode = cop1_op; |
397 | mips32_insn.fp1_format.op = op; | |
398 | mips32_insn.fp1_format.rt = | |
399 | insn.mm_fp1_format.rt; | |
400 | mips32_insn.fp1_format.fs = | |
401 | insn.mm_fp1_format.fs; | |
402 | mips32_insn.fp1_format.fd = 0; | |
403 | mips32_insn.fp1_format.func = 0; | |
404 | break; | |
405 | default: | |
406 | return SIGILL; | |
102cedc3 LY |
407 | } |
408 | break; | |
409 | case mm_32f_74_op: /* c.cond.fmt */ | |
410 | mips32_insn.fp0_format.opcode = cop1_op; | |
411 | mips32_insn.fp0_format.fmt = | |
412 | sdps_format[insn.mm_fp4_format.fmt]; | |
413 | mips32_insn.fp0_format.ft = insn.mm_fp4_format.rt; | |
414 | mips32_insn.fp0_format.fs = insn.mm_fp4_format.fs; | |
415 | mips32_insn.fp0_format.fd = insn.mm_fp4_format.cc << 2; | |
416 | mips32_insn.fp0_format.func = | |
417 | insn.mm_fp4_format.cond | MM_MIPS32_COND_FC; | |
418 | break; | |
419 | default: | |
420 | return SIGILL; | |
102cedc3 LY |
421 | } |
422 | break; | |
423 | default: | |
424 | return SIGILL; | |
102cedc3 LY |
425 | } |
426 | ||
427 | *insn_ptr = mips32_insn; | |
428 | return 0; | |
429 | } | |
430 | ||
1da177e4 LT |
431 | /* |
432 | * Redundant with logic already in kernel/branch.c, | |
433 | * embedded in compute_return_epc. At some point, | |
434 | * a single subroutine should be used across both | |
435 | * modules. | |
436 | */ | |
102cedc3 LY |
437 | static int isBranchInstr(struct pt_regs *regs, struct mm_decoded_insn dec_insn, |
438 | unsigned long *contpc) | |
1da177e4 | 439 | { |
102cedc3 LY |
440 | union mips_instruction insn = (union mips_instruction)dec_insn.insn; |
441 | unsigned int fcr31; | |
442 | unsigned int bit = 0; | |
443 | ||
444 | switch (insn.i_format.opcode) { | |
1da177e4 | 445 | case spec_op: |
102cedc3 | 446 | switch (insn.r_format.func) { |
1da177e4 | 447 | case jalr_op: |
102cedc3 LY |
448 | regs->regs[insn.r_format.rd] = |
449 | regs->cp0_epc + dec_insn.pc_inc + | |
450 | dec_insn.next_pc_inc; | |
451 | /* Fall through */ | |
1da177e4 | 452 | case jr_op: |
5f9f41c4 | 453 | /* For R6, JR already emulated in jalr_op */ |
143fefc8 | 454 | if (NO_R6EMU && insn.r_format.func == jr_op) |
5f9f41c4 | 455 | break; |
102cedc3 | 456 | *contpc = regs->regs[insn.r_format.rs]; |
1da177e4 LT |
457 | return 1; |
458 | } | |
459 | break; | |
1da177e4 | 460 | case bcond_op: |
102cedc3 LY |
461 | switch (insn.i_format.rt) { |
462 | case bltzal_op: | |
463 | case bltzall_op: | |
319824ea MC |
464 | if (NO_R6EMU && (insn.i_format.rs || |
465 | insn.i_format.rt == bltzall_op)) | |
466 | break; | |
467 | ||
102cedc3 LY |
468 | regs->regs[31] = regs->cp0_epc + |
469 | dec_insn.pc_inc + | |
470 | dec_insn.next_pc_inc; | |
471 | /* Fall through */ | |
1da177e4 | 472 | case bltzl_op: |
319824ea MC |
473 | if (NO_R6EMU) |
474 | break; | |
475 | case bltz_op: | |
102cedc3 LY |
476 | if ((long)regs->regs[insn.i_format.rs] < 0) |
477 | *contpc = regs->cp0_epc + | |
478 | dec_insn.pc_inc + | |
479 | (insn.i_format.simmediate << 2); | |
480 | else | |
481 | *contpc = regs->cp0_epc + | |
482 | dec_insn.pc_inc + | |
483 | dec_insn.next_pc_inc; | |
484 | return 1; | |
1da177e4 | 485 | case bgezal_op: |
1da177e4 | 486 | case bgezall_op: |
319824ea MC |
487 | if (NO_R6EMU && (insn.i_format.rs || |
488 | insn.i_format.rt == bgezall_op)) | |
489 | break; | |
490 | ||
102cedc3 LY |
491 | regs->regs[31] = regs->cp0_epc + |
492 | dec_insn.pc_inc + | |
493 | dec_insn.next_pc_inc; | |
494 | /* Fall through */ | |
102cedc3 | 495 | case bgezl_op: |
319824ea MC |
496 | if (NO_R6EMU) |
497 | break; | |
498 | case bgez_op: | |
102cedc3 LY |
499 | if ((long)regs->regs[insn.i_format.rs] >= 0) |
500 | *contpc = regs->cp0_epc + | |
501 | dec_insn.pc_inc + | |
502 | (insn.i_format.simmediate << 2); | |
503 | else | |
504 | *contpc = regs->cp0_epc + | |
505 | dec_insn.pc_inc + | |
506 | dec_insn.next_pc_inc; | |
1da177e4 LT |
507 | return 1; |
508 | } | |
509 | break; | |
1da177e4 | 510 | case jalx_op: |
102cedc3 LY |
511 | set_isa16_mode(bit); |
512 | case jal_op: | |
513 | regs->regs[31] = regs->cp0_epc + | |
514 | dec_insn.pc_inc + | |
515 | dec_insn.next_pc_inc; | |
516 | /* Fall through */ | |
517 | case j_op: | |
518 | *contpc = regs->cp0_epc + dec_insn.pc_inc; | |
519 | *contpc >>= 28; | |
520 | *contpc <<= 28; | |
521 | *contpc |= (insn.j_format.target << 2); | |
522 | /* Set microMIPS mode bit: XOR for jalx. */ | |
523 | *contpc ^= bit; | |
524 | return 1; | |
1da177e4 | 525 | case beql_op: |
319824ea MC |
526 | if (NO_R6EMU) |
527 | break; | |
528 | case beq_op: | |
102cedc3 LY |
529 | if (regs->regs[insn.i_format.rs] == |
530 | regs->regs[insn.i_format.rt]) | |
531 | *contpc = regs->cp0_epc + | |
532 | dec_insn.pc_inc + | |
533 | (insn.i_format.simmediate << 2); | |
534 | else | |
535 | *contpc = regs->cp0_epc + | |
536 | dec_insn.pc_inc + | |
537 | dec_insn.next_pc_inc; | |
538 | return 1; | |
1da177e4 | 539 | case bnel_op: |
319824ea MC |
540 | if (NO_R6EMU) |
541 | break; | |
542 | case bne_op: | |
102cedc3 LY |
543 | if (regs->regs[insn.i_format.rs] != |
544 | regs->regs[insn.i_format.rt]) | |
545 | *contpc = regs->cp0_epc + | |
546 | dec_insn.pc_inc + | |
547 | (insn.i_format.simmediate << 2); | |
548 | else | |
549 | *contpc = regs->cp0_epc + | |
550 | dec_insn.pc_inc + | |
551 | dec_insn.next_pc_inc; | |
552 | return 1; | |
1da177e4 | 553 | case blezl_op: |
e9d92d22 | 554 | if (!insn.i_format.rt && NO_R6EMU) |
319824ea MC |
555 | break; |
556 | case blez_op: | |
a8ff66f5 MC |
557 | |
558 | /* | |
559 | * Compact branches for R6 for the | |
560 | * blez and blezl opcodes. | |
561 | * BLEZ | rs = 0 | rt != 0 == BLEZALC | |
562 | * BLEZ | rs = rt != 0 == BGEZALC | |
563 | * BLEZ | rs != 0 | rt != 0 == BGEUC | |
564 | * BLEZL | rs = 0 | rt != 0 == BLEZC | |
565 | * BLEZL | rs = rt != 0 == BGEZC | |
566 | * BLEZL | rs != 0 | rt != 0 == BGEC | |
567 | * | |
568 | * For real BLEZ{,L}, rt is always 0. | |
569 | */ | |
570 | if (cpu_has_mips_r6 && insn.i_format.rt) { | |
571 | if ((insn.i_format.opcode == blez_op) && | |
572 | ((!insn.i_format.rs && insn.i_format.rt) || | |
573 | (insn.i_format.rs == insn.i_format.rt))) | |
574 | regs->regs[31] = regs->cp0_epc + | |
575 | dec_insn.pc_inc; | |
576 | *contpc = regs->cp0_epc + dec_insn.pc_inc + | |
577 | dec_insn.next_pc_inc; | |
578 | ||
579 | return 1; | |
580 | } | |
102cedc3 LY |
581 | if ((long)regs->regs[insn.i_format.rs] <= 0) |
582 | *contpc = regs->cp0_epc + | |
583 | dec_insn.pc_inc + | |
584 | (insn.i_format.simmediate << 2); | |
585 | else | |
586 | *contpc = regs->cp0_epc + | |
587 | dec_insn.pc_inc + | |
588 | dec_insn.next_pc_inc; | |
589 | return 1; | |
1da177e4 | 590 | case bgtzl_op: |
e9d92d22 | 591 | if (!insn.i_format.rt && NO_R6EMU) |
319824ea MC |
592 | break; |
593 | case bgtz_op: | |
f1b44067 MC |
594 | /* |
595 | * Compact branches for R6 for the | |
596 | * bgtz and bgtzl opcodes. | |
597 | * BGTZ | rs = 0 | rt != 0 == BGTZALC | |
598 | * BGTZ | rs = rt != 0 == BLTZALC | |
599 | * BGTZ | rs != 0 | rt != 0 == BLTUC | |
600 | * BGTZL | rs = 0 | rt != 0 == BGTZC | |
601 | * BGTZL | rs = rt != 0 == BLTZC | |
602 | * BGTZL | rs != 0 | rt != 0 == BLTC | |
603 | * | |
604 | * *ZALC varint for BGTZ &&& rt != 0 | |
605 | * For real GTZ{,L}, rt is always 0. | |
606 | */ | |
607 | if (cpu_has_mips_r6 && insn.i_format.rt) { | |
608 | if ((insn.i_format.opcode == blez_op) && | |
609 | ((!insn.i_format.rs && insn.i_format.rt) || | |
610 | (insn.i_format.rs == insn.i_format.rt))) | |
611 | regs->regs[31] = regs->cp0_epc + | |
612 | dec_insn.pc_inc; | |
613 | *contpc = regs->cp0_epc + dec_insn.pc_inc + | |
614 | dec_insn.next_pc_inc; | |
615 | ||
616 | return 1; | |
617 | } | |
618 | ||
102cedc3 LY |
619 | if ((long)regs->regs[insn.i_format.rs] > 0) |
620 | *contpc = regs->cp0_epc + | |
621 | dec_insn.pc_inc + | |
622 | (insn.i_format.simmediate << 2); | |
623 | else | |
624 | *contpc = regs->cp0_epc + | |
625 | dec_insn.pc_inc + | |
626 | dec_insn.next_pc_inc; | |
1da177e4 | 627 | return 1; |
c893ce38 | 628 | case cbcond0_op: |
10d962d5 | 629 | case cbcond1_op: |
c893ce38 MC |
630 | if (!cpu_has_mips_r6) |
631 | break; | |
632 | if (insn.i_format.rt && !insn.i_format.rs) | |
633 | regs->regs[31] = regs->cp0_epc + 4; | |
634 | *contpc = regs->cp0_epc + dec_insn.pc_inc + | |
635 | dec_insn.next_pc_inc; | |
636 | ||
637 | return 1; | |
c26d4219 DD |
638 | #ifdef CONFIG_CPU_CAVIUM_OCTEON |
639 | case lwc2_op: /* This is bbit0 on Octeon */ | |
640 | if ((regs->regs[insn.i_format.rs] & (1ull<<insn.i_format.rt)) == 0) | |
641 | *contpc = regs->cp0_epc + 4 + (insn.i_format.simmediate << 2); | |
642 | else | |
643 | *contpc = regs->cp0_epc + 8; | |
644 | return 1; | |
645 | case ldc2_op: /* This is bbit032 on Octeon */ | |
646 | if ((regs->regs[insn.i_format.rs] & (1ull<<(insn.i_format.rt + 32))) == 0) | |
647 | *contpc = regs->cp0_epc + 4 + (insn.i_format.simmediate << 2); | |
648 | else | |
649 | *contpc = regs->cp0_epc + 8; | |
650 | return 1; | |
651 | case swc2_op: /* This is bbit1 on Octeon */ | |
652 | if (regs->regs[insn.i_format.rs] & (1ull<<insn.i_format.rt)) | |
653 | *contpc = regs->cp0_epc + 4 + (insn.i_format.simmediate << 2); | |
654 | else | |
655 | *contpc = regs->cp0_epc + 8; | |
656 | return 1; | |
657 | case sdc2_op: /* This is bbit132 on Octeon */ | |
658 | if (regs->regs[insn.i_format.rs] & (1ull<<(insn.i_format.rt + 32))) | |
659 | *contpc = regs->cp0_epc + 4 + (insn.i_format.simmediate << 2); | |
660 | else | |
661 | *contpc = regs->cp0_epc + 8; | |
662 | return 1; | |
8467ca01 MC |
663 | #else |
664 | case bc6_op: | |
665 | /* | |
666 | * Only valid for MIPS R6 but we can still end up | |
667 | * here from a broken userland so just tell emulator | |
668 | * this is not a branch and let it break later on. | |
669 | */ | |
670 | if (!cpu_has_mips_r6) | |
671 | break; | |
672 | *contpc = regs->cp0_epc + dec_insn.pc_inc + | |
673 | dec_insn.next_pc_inc; | |
674 | ||
84fef630 MC |
675 | return 1; |
676 | case balc6_op: | |
677 | if (!cpu_has_mips_r6) | |
678 | break; | |
679 | regs->regs[31] = regs->cp0_epc + 4; | |
680 | *contpc = regs->cp0_epc + dec_insn.pc_inc + | |
681 | dec_insn.next_pc_inc; | |
682 | ||
69b9a2fd MC |
683 | return 1; |
684 | case beqzcjic_op: | |
685 | if (!cpu_has_mips_r6) | |
686 | break; | |
687 | *contpc = regs->cp0_epc + dec_insn.pc_inc + | |
688 | dec_insn.next_pc_inc; | |
689 | ||
28d6f93d MC |
690 | return 1; |
691 | case bnezcjialc_op: | |
692 | if (!cpu_has_mips_r6) | |
693 | break; | |
694 | if (!insn.i_format.rs) | |
695 | regs->regs[31] = regs->cp0_epc + 4; | |
696 | *contpc = regs->cp0_epc + dec_insn.pc_inc + | |
697 | dec_insn.next_pc_inc; | |
698 | ||
8467ca01 | 699 | return 1; |
c26d4219 | 700 | #endif |
1da177e4 LT |
701 | case cop0_op: |
702 | case cop1_op: | |
c8a34581 MC |
703 | /* Need to check for R6 bc1nez and bc1eqz branches */ |
704 | if (cpu_has_mips_r6 && | |
705 | ((insn.i_format.rs == bc1eqz_op) || | |
706 | (insn.i_format.rs == bc1nez_op))) { | |
707 | bit = 0; | |
708 | switch (insn.i_format.rs) { | |
709 | case bc1eqz_op: | |
710 | if (get_fpr32(¤t->thread.fpu.fpr[insn.i_format.rt], 0) & 0x1) | |
711 | bit = 1; | |
712 | break; | |
713 | case bc1nez_op: | |
714 | if (!(get_fpr32(¤t->thread.fpu.fpr[insn.i_format.rt], 0) & 0x1)) | |
715 | bit = 1; | |
716 | break; | |
717 | } | |
718 | if (bit) | |
719 | *contpc = regs->cp0_epc + | |
720 | dec_insn.pc_inc + | |
721 | (insn.i_format.simmediate << 2); | |
722 | else | |
723 | *contpc = regs->cp0_epc + | |
724 | dec_insn.pc_inc + | |
725 | dec_insn.next_pc_inc; | |
726 | ||
727 | return 1; | |
728 | } | |
729 | /* R2/R6 compatible cop1 instruction. Fall through */ | |
1da177e4 LT |
730 | case cop2_op: |
731 | case cop1x_op: | |
102cedc3 LY |
732 | if (insn.i_format.rs == bc_op) { |
733 | preempt_disable(); | |
734 | if (is_fpu_owner()) | |
842dfc11 | 735 | fcr31 = read_32bit_cp1_register(CP1_STATUS); |
102cedc3 LY |
736 | else |
737 | fcr31 = current->thread.fpu.fcr31; | |
738 | preempt_enable(); | |
739 | ||
740 | bit = (insn.i_format.rt >> 2); | |
741 | bit += (bit != 0); | |
742 | bit += 23; | |
743 | switch (insn.i_format.rt & 3) { | |
744 | case 0: /* bc1f */ | |
745 | case 2: /* bc1fl */ | |
746 | if (~fcr31 & (1 << bit)) | |
747 | *contpc = regs->cp0_epc + | |
748 | dec_insn.pc_inc + | |
749 | (insn.i_format.simmediate << 2); | |
750 | else | |
751 | *contpc = regs->cp0_epc + | |
752 | dec_insn.pc_inc + | |
753 | dec_insn.next_pc_inc; | |
754 | return 1; | |
102cedc3 LY |
755 | case 1: /* bc1t */ |
756 | case 3: /* bc1tl */ | |
757 | if (fcr31 & (1 << bit)) | |
758 | *contpc = regs->cp0_epc + | |
759 | dec_insn.pc_inc + | |
760 | (insn.i_format.simmediate << 2); | |
761 | else | |
762 | *contpc = regs->cp0_epc + | |
763 | dec_insn.pc_inc + | |
764 | dec_insn.next_pc_inc; | |
765 | return 1; | |
102cedc3 LY |
766 | } |
767 | } | |
1da177e4 LT |
768 | break; |
769 | } | |
1da177e4 LT |
770 | return 0; |
771 | } | |
772 | ||
773 | /* | |
774 | * In the Linux kernel, we support selection of FPR format on the | |
70342287 | 775 | * basis of the Status.FR bit. If an FPU is not present, the FR bit |
da0bac33 | 776 | * is hardwired to zero, which would imply a 32-bit FPU even for |
597ce172 | 777 | * 64-bit CPUs so we rather look at TIF_32BIT_FPREGS. |
51d943f0 RB |
778 | * FPU emu is slow and bulky and optimizing this function offers fairly |
779 | * sizeable benefits so we try to be clever and make this function return | |
780 | * a constant whenever possible, that is on 64-bit kernels without O32 | |
597ce172 | 781 | * compatibility enabled and on 32-bit without 64-bit FPU support. |
1da177e4 | 782 | */ |
da0bac33 DD |
783 | static inline int cop1_64bit(struct pt_regs *xcp) |
784 | { | |
08a07904 RB |
785 | if (config_enabled(CONFIG_64BIT) && !config_enabled(CONFIG_MIPS32_O32)) |
786 | return 1; | |
787 | else if (config_enabled(CONFIG_32BIT) && | |
788 | !config_enabled(CONFIG_MIPS_O32_FP64_SUPPORT)) | |
789 | return 0; | |
790 | ||
597ce172 | 791 | return !test_thread_flag(TIF_32BIT_FPREGS); |
da0bac33 DD |
792 | } |
793 | ||
4227a2d4 PB |
794 | static inline bool hybrid_fprs(void) |
795 | { | |
796 | return test_thread_flag(TIF_HYBRID_FPREGS); | |
797 | } | |
798 | ||
47fa0c02 RB |
799 | #define SIFROMREG(si, x) \ |
800 | do { \ | |
4227a2d4 | 801 | if (cop1_64bit(xcp) && !hybrid_fprs()) \ |
c8c0da6b | 802 | (si) = (int)get_fpr32(&ctx->fpr[x], 0); \ |
bbd426f5 | 803 | else \ |
c8c0da6b | 804 | (si) = (int)get_fpr32(&ctx->fpr[(x) & ~1], (x) & 1); \ |
bbd426f5 | 805 | } while (0) |
1da177e4 | 806 | |
47fa0c02 RB |
807 | #define SITOREG(si, x) \ |
808 | do { \ | |
4227a2d4 | 809 | if (cop1_64bit(xcp) && !hybrid_fprs()) { \ |
ef1c47af | 810 | unsigned i; \ |
bbd426f5 | 811 | set_fpr32(&ctx->fpr[x], 0, si); \ |
ef1c47af PB |
812 | for (i = 1; i < ARRAY_SIZE(ctx->fpr[x].val32); i++) \ |
813 | set_fpr32(&ctx->fpr[x], i, 0); \ | |
814 | } else { \ | |
bbd426f5 | 815 | set_fpr32(&ctx->fpr[(x) & ~1], (x) & 1, si); \ |
ef1c47af | 816 | } \ |
bbd426f5 | 817 | } while (0) |
1da177e4 | 818 | |
c8c0da6b | 819 | #define SIFROMHREG(si, x) ((si) = (int)get_fpr32(&ctx->fpr[x], 1)) |
ef1c47af | 820 | |
47fa0c02 RB |
821 | #define SITOHREG(si, x) \ |
822 | do { \ | |
ef1c47af PB |
823 | unsigned i; \ |
824 | set_fpr32(&ctx->fpr[x], 1, si); \ | |
825 | for (i = 2; i < ARRAY_SIZE(ctx->fpr[x].val32); i++) \ | |
826 | set_fpr32(&ctx->fpr[x], i, 0); \ | |
827 | } while (0) | |
1ac94400 | 828 | |
47fa0c02 | 829 | #define DIFROMREG(di, x) \ |
bbd426f5 PB |
830 | ((di) = get_fpr64(&ctx->fpr[(x) & ~(cop1_64bit(xcp) == 0)], 0)) |
831 | ||
47fa0c02 RB |
832 | #define DITOREG(di, x) \ |
833 | do { \ | |
ef1c47af PB |
834 | unsigned fpr, i; \ |
835 | fpr = (x) & ~(cop1_64bit(xcp) == 0); \ | |
836 | set_fpr64(&ctx->fpr[fpr], 0, di); \ | |
837 | for (i = 1; i < ARRAY_SIZE(ctx->fpr[x].val64); i++) \ | |
838 | set_fpr64(&ctx->fpr[fpr], i, 0); \ | |
839 | } while (0) | |
1da177e4 | 840 | |
21a151d8 RB |
841 | #define SPFROMREG(sp, x) SIFROMREG((sp).bits, x) |
842 | #define SPTOREG(sp, x) SITOREG((sp).bits, x) | |
843 | #define DPFROMREG(dp, x) DIFROMREG((dp).bits, x) | |
844 | #define DPTOREG(dp, x) DITOREG((dp).bits, x) | |
1da177e4 | 845 | |
d4f5b088 MR |
846 | /* |
847 | * Emulate a CFC1 instruction. | |
848 | */ | |
849 | static inline void cop1_cfc(struct pt_regs *xcp, struct mips_fpu_struct *ctx, | |
850 | mips_instruction ir) | |
851 | { | |
c491cfa2 MR |
852 | u32 fcr31 = ctx->fcr31; |
853 | u32 value = 0; | |
d4f5b088 | 854 | |
c491cfa2 MR |
855 | switch (MIPSInst_RD(ir)) { |
856 | case FPCREG_CSR: | |
857 | value = fcr31; | |
d4f5b088 | 858 | pr_debug("%p gpr[%d]<-csr=%08x\n", |
c491cfa2 MR |
859 | (void *)xcp->cp0_epc, MIPSInst_RT(ir), value); |
860 | break; | |
861 | ||
862 | case FPCREG_FENR: | |
863 | if (!cpu_has_mips_r) | |
864 | break; | |
865 | value = (fcr31 >> (FPU_CSR_FS_S - MIPS_FENR_FS_S)) & | |
866 | MIPS_FENR_FS; | |
867 | value |= fcr31 & (FPU_CSR_ALL_E | FPU_CSR_RM); | |
868 | pr_debug("%p gpr[%d]<-enr=%08x\n", | |
869 | (void *)xcp->cp0_epc, MIPSInst_RT(ir), value); | |
870 | break; | |
871 | ||
872 | case FPCREG_FEXR: | |
873 | if (!cpu_has_mips_r) | |
874 | break; | |
875 | value = fcr31 & (FPU_CSR_ALL_X | FPU_CSR_ALL_S); | |
876 | pr_debug("%p gpr[%d]<-exr=%08x\n", | |
877 | (void *)xcp->cp0_epc, MIPSInst_RT(ir), value); | |
878 | break; | |
879 | ||
880 | case FPCREG_FCCR: | |
881 | if (!cpu_has_mips_r) | |
882 | break; | |
883 | value = (fcr31 >> (FPU_CSR_COND_S - MIPS_FCCR_COND0_S)) & | |
884 | MIPS_FCCR_COND0; | |
885 | value |= (fcr31 >> (FPU_CSR_COND1_S - MIPS_FCCR_COND1_S)) & | |
886 | (MIPS_FCCR_CONDX & ~MIPS_FCCR_COND0); | |
887 | pr_debug("%p gpr[%d]<-ccr=%08x\n", | |
888 | (void *)xcp->cp0_epc, MIPSInst_RT(ir), value); | |
889 | break; | |
890 | ||
891 | case FPCREG_RID: | |
03dce595 | 892 | value = boot_cpu_data.fpu_id; |
c491cfa2 MR |
893 | break; |
894 | ||
895 | default: | |
896 | break; | |
897 | } | |
898 | ||
d4f5b088 MR |
899 | if (MIPSInst_RT(ir)) |
900 | xcp->regs[MIPSInst_RT(ir)] = value; | |
901 | } | |
902 | ||
903 | /* | |
904 | * Emulate a CTC1 instruction. | |
905 | */ | |
906 | static inline void cop1_ctc(struct pt_regs *xcp, struct mips_fpu_struct *ctx, | |
907 | mips_instruction ir) | |
908 | { | |
c491cfa2 | 909 | u32 fcr31 = ctx->fcr31; |
d4f5b088 | 910 | u32 value; |
9b26616c | 911 | u32 mask; |
d4f5b088 MR |
912 | |
913 | if (MIPSInst_RT(ir) == 0) | |
914 | value = 0; | |
915 | else | |
916 | value = xcp->regs[MIPSInst_RT(ir)]; | |
917 | ||
c491cfa2 MR |
918 | switch (MIPSInst_RD(ir)) { |
919 | case FPCREG_CSR: | |
d4f5b088 | 920 | pr_debug("%p gpr[%d]->csr=%08x\n", |
c491cfa2 | 921 | (void *)xcp->cp0_epc, MIPSInst_RT(ir), value); |
d4f5b088 | 922 | |
9b26616c | 923 | /* Preserve read-only bits. */ |
03dce595 | 924 | mask = boot_cpu_data.fpu_msk31; |
9b26616c | 925 | fcr31 = (value & ~mask) | (fcr31 & mask); |
c491cfa2 MR |
926 | break; |
927 | ||
928 | case FPCREG_FENR: | |
929 | if (!cpu_has_mips_r) | |
930 | break; | |
931 | pr_debug("%p gpr[%d]->enr=%08x\n", | |
932 | (void *)xcp->cp0_epc, MIPSInst_RT(ir), value); | |
933 | fcr31 &= ~(FPU_CSR_FS | FPU_CSR_ALL_E | FPU_CSR_RM); | |
934 | fcr31 |= (value << (FPU_CSR_FS_S - MIPS_FENR_FS_S)) & | |
935 | FPU_CSR_FS; | |
936 | fcr31 |= value & (FPU_CSR_ALL_E | FPU_CSR_RM); | |
937 | break; | |
938 | ||
939 | case FPCREG_FEXR: | |
940 | if (!cpu_has_mips_r) | |
941 | break; | |
942 | pr_debug("%p gpr[%d]->exr=%08x\n", | |
943 | (void *)xcp->cp0_epc, MIPSInst_RT(ir), value); | |
944 | fcr31 &= ~(FPU_CSR_ALL_X | FPU_CSR_ALL_S); | |
945 | fcr31 |= value & (FPU_CSR_ALL_X | FPU_CSR_ALL_S); | |
946 | break; | |
947 | ||
948 | case FPCREG_FCCR: | |
949 | if (!cpu_has_mips_r) | |
950 | break; | |
951 | pr_debug("%p gpr[%d]->ccr=%08x\n", | |
952 | (void *)xcp->cp0_epc, MIPSInst_RT(ir), value); | |
953 | fcr31 &= ~(FPU_CSR_CONDX | FPU_CSR_COND); | |
954 | fcr31 |= (value << (FPU_CSR_COND_S - MIPS_FCCR_COND0_S)) & | |
955 | FPU_CSR_COND; | |
956 | fcr31 |= (value << (FPU_CSR_COND1_S - MIPS_FCCR_COND1_S)) & | |
957 | FPU_CSR_CONDX; | |
958 | break; | |
959 | ||
960 | default: | |
961 | break; | |
d4f5b088 | 962 | } |
c491cfa2 MR |
963 | |
964 | ctx->fcr31 = fcr31; | |
d4f5b088 MR |
965 | } |
966 | ||
1da177e4 LT |
967 | /* |
968 | * Emulate the single floating point instruction pointed at by EPC. | |
969 | * Two instructions if the instruction is in a branch delay slot. | |
970 | */ | |
971 | ||
515b029d | 972 | static int cop1Emulate(struct pt_regs *xcp, struct mips_fpu_struct *ctx, |
102cedc3 | 973 | struct mm_decoded_insn dec_insn, void *__user *fault_addr) |
1da177e4 | 974 | { |
102cedc3 | 975 | unsigned long contpc = xcp->cp0_epc + dec_insn.pc_inc; |
3f7cac41 RB |
976 | unsigned int cond, cbit; |
977 | mips_instruction ir; | |
978 | int likely, pc_inc; | |
979 | u32 __user *wva; | |
980 | u64 __user *dva; | |
3f7cac41 RB |
981 | u32 wval; |
982 | u64 dval; | |
983 | int sig; | |
1da177e4 | 984 | |
70e4c234 RB |
985 | /* |
986 | * These are giving gcc a gentle hint about what to expect in | |
987 | * dec_inst in order to do better optimization. | |
988 | */ | |
989 | if (!cpu_has_mmips && dec_insn.micro_mips_mode) | |
990 | unreachable(); | |
991 | ||
1da177e4 | 992 | /* XXX NEC Vr54xx bug workaround */ |
e7e9cae5 | 993 | if (delay_slot(xcp)) { |
102cedc3 LY |
994 | if (dec_insn.micro_mips_mode) { |
995 | if (!mm_isBranchInstr(xcp, dec_insn, &contpc)) | |
e7e9cae5 | 996 | clear_delay_slot(xcp); |
102cedc3 LY |
997 | } else { |
998 | if (!isBranchInstr(xcp, dec_insn, &contpc)) | |
e7e9cae5 | 999 | clear_delay_slot(xcp); |
102cedc3 LY |
1000 | } |
1001 | } | |
1da177e4 | 1002 | |
e7e9cae5 | 1003 | if (delay_slot(xcp)) { |
1da177e4 LT |
1004 | /* |
1005 | * The instruction to be emulated is in a branch delay slot | |
70342287 | 1006 | * which means that we have to emulate the branch instruction |
1da177e4 LT |
1007 | * BEFORE we do the cop1 instruction. |
1008 | * | |
1009 | * This branch could be a COP1 branch, but in that case we | |
1010 | * would have had a trap for that instruction, and would not | |
1011 | * come through this route. | |
1012 | * | |
1013 | * Linux MIPS branch emulator operates on context, updating the | |
1014 | * cp0_epc. | |
1015 | */ | |
102cedc3 LY |
1016 | ir = dec_insn.next_insn; /* process delay slot instr */ |
1017 | pc_inc = dec_insn.next_pc_inc; | |
1018 | } else { | |
1019 | ir = dec_insn.insn; /* process current instr */ | |
1020 | pc_inc = dec_insn.pc_inc; | |
1021 | } | |
1da177e4 | 1022 | |
102cedc3 LY |
1023 | /* |
1024 | * Since microMIPS FPU instructios are a subset of MIPS32 FPU | |
1025 | * instructions, we want to convert microMIPS FPU instructions | |
1026 | * into MIPS32 instructions so that we could reuse all of the | |
1027 | * FPU emulation code. | |
1028 | * | |
1029 | * NOTE: We cannot do this for branch instructions since they | |
1030 | * are not a subset. Example: Cannot emulate a 16-bit | |
1031 | * aligned target address with a MIPS32 instruction. | |
1032 | */ | |
1033 | if (dec_insn.micro_mips_mode) { | |
1034 | /* | |
1035 | * If next instruction is a 16-bit instruction, then it | |
1036 | * it cannot be a FPU instruction. This could happen | |
1037 | * since we can be called for non-FPU instructions. | |
1038 | */ | |
1039 | if ((pc_inc == 2) || | |
1040 | (microMIPS32_to_MIPS32((union mips_instruction *)&ir) | |
1041 | == SIGILL)) | |
1da177e4 | 1042 | return SIGILL; |
1da177e4 LT |
1043 | } |
1044 | ||
3f7cac41 | 1045 | emul: |
a8b0ca17 | 1046 | perf_sw_event(PERF_COUNT_SW_EMULATION_FAULTS, 1, xcp, 0); |
b6ee75ed | 1047 | MIPS_FPU_EMU_INC_STATS(emulated); |
1da177e4 | 1048 | switch (MIPSInst_OPCODE(ir)) { |
3f7cac41 RB |
1049 | case ldc1_op: |
1050 | dva = (u64 __user *) (xcp->regs[MIPSInst_RS(ir)] + | |
1051 | MIPSInst_SIMM(ir)); | |
b6ee75ed | 1052 | MIPS_FPU_EMU_INC_STATS(loads); |
515b029d | 1053 | |
3f7cac41 | 1054 | if (!access_ok(VERIFY_READ, dva, sizeof(u64))) { |
b6ee75ed | 1055 | MIPS_FPU_EMU_INC_STATS(errors); |
3f7cac41 | 1056 | *fault_addr = dva; |
1da177e4 LT |
1057 | return SIGBUS; |
1058 | } | |
3f7cac41 | 1059 | if (__get_user(dval, dva)) { |
515b029d | 1060 | MIPS_FPU_EMU_INC_STATS(errors); |
3f7cac41 | 1061 | *fault_addr = dva; |
515b029d DD |
1062 | return SIGSEGV; |
1063 | } | |
3f7cac41 | 1064 | DITOREG(dval, MIPSInst_RT(ir)); |
1da177e4 | 1065 | break; |
1da177e4 | 1066 | |
3f7cac41 RB |
1067 | case sdc1_op: |
1068 | dva = (u64 __user *) (xcp->regs[MIPSInst_RS(ir)] + | |
1069 | MIPSInst_SIMM(ir)); | |
b6ee75ed | 1070 | MIPS_FPU_EMU_INC_STATS(stores); |
3f7cac41 RB |
1071 | DIFROMREG(dval, MIPSInst_RT(ir)); |
1072 | if (!access_ok(VERIFY_WRITE, dva, sizeof(u64))) { | |
b6ee75ed | 1073 | MIPS_FPU_EMU_INC_STATS(errors); |
3f7cac41 | 1074 | *fault_addr = dva; |
1da177e4 LT |
1075 | return SIGBUS; |
1076 | } | |
3f7cac41 | 1077 | if (__put_user(dval, dva)) { |
515b029d | 1078 | MIPS_FPU_EMU_INC_STATS(errors); |
3f7cac41 | 1079 | *fault_addr = dva; |
515b029d DD |
1080 | return SIGSEGV; |
1081 | } | |
1da177e4 | 1082 | break; |
1da177e4 | 1083 | |
3f7cac41 RB |
1084 | case lwc1_op: |
1085 | wva = (u32 __user *) (xcp->regs[MIPSInst_RS(ir)] + | |
1086 | MIPSInst_SIMM(ir)); | |
b6ee75ed | 1087 | MIPS_FPU_EMU_INC_STATS(loads); |
3f7cac41 | 1088 | if (!access_ok(VERIFY_READ, wva, sizeof(u32))) { |
b6ee75ed | 1089 | MIPS_FPU_EMU_INC_STATS(errors); |
3f7cac41 | 1090 | *fault_addr = wva; |
1da177e4 LT |
1091 | return SIGBUS; |
1092 | } | |
3f7cac41 | 1093 | if (__get_user(wval, wva)) { |
515b029d | 1094 | MIPS_FPU_EMU_INC_STATS(errors); |
3f7cac41 | 1095 | *fault_addr = wva; |
515b029d DD |
1096 | return SIGSEGV; |
1097 | } | |
3f7cac41 | 1098 | SITOREG(wval, MIPSInst_RT(ir)); |
1da177e4 | 1099 | break; |
1da177e4 | 1100 | |
3f7cac41 RB |
1101 | case swc1_op: |
1102 | wva = (u32 __user *) (xcp->regs[MIPSInst_RS(ir)] + | |
1103 | MIPSInst_SIMM(ir)); | |
b6ee75ed | 1104 | MIPS_FPU_EMU_INC_STATS(stores); |
3f7cac41 RB |
1105 | SIFROMREG(wval, MIPSInst_RT(ir)); |
1106 | if (!access_ok(VERIFY_WRITE, wva, sizeof(u32))) { | |
b6ee75ed | 1107 | MIPS_FPU_EMU_INC_STATS(errors); |
3f7cac41 | 1108 | *fault_addr = wva; |
1da177e4 LT |
1109 | return SIGBUS; |
1110 | } | |
3f7cac41 | 1111 | if (__put_user(wval, wva)) { |
515b029d | 1112 | MIPS_FPU_EMU_INC_STATS(errors); |
3f7cac41 | 1113 | *fault_addr = wva; |
515b029d DD |
1114 | return SIGSEGV; |
1115 | } | |
1da177e4 | 1116 | break; |
1da177e4 LT |
1117 | |
1118 | case cop1_op: | |
1119 | switch (MIPSInst_RS(ir)) { | |
1da177e4 | 1120 | case dmfc_op: |
08a07904 RB |
1121 | if (!cpu_has_mips_3_4_5 && !cpu_has_mips64) |
1122 | return SIGILL; | |
1123 | ||
1da177e4 LT |
1124 | /* copregister fs -> gpr[rt] */ |
1125 | if (MIPSInst_RT(ir) != 0) { | |
1126 | DIFROMREG(xcp->regs[MIPSInst_RT(ir)], | |
1127 | MIPSInst_RD(ir)); | |
1128 | } | |
1129 | break; | |
1130 | ||
1131 | case dmtc_op: | |
08a07904 RB |
1132 | if (!cpu_has_mips_3_4_5 && !cpu_has_mips64) |
1133 | return SIGILL; | |
1134 | ||
1da177e4 LT |
1135 | /* copregister fs <- rt */ |
1136 | DITOREG(xcp->regs[MIPSInst_RT(ir)], MIPSInst_RD(ir)); | |
1137 | break; | |
1da177e4 | 1138 | |
1ac94400 | 1139 | case mfhc_op: |
e8f80cc1 | 1140 | if (!cpu_has_mips_r2_r6) |
1ac94400 LY |
1141 | goto sigill; |
1142 | ||
1143 | /* copregister rd -> gpr[rt] */ | |
1144 | if (MIPSInst_RT(ir) != 0) { | |
1145 | SIFROMHREG(xcp->regs[MIPSInst_RT(ir)], | |
1146 | MIPSInst_RD(ir)); | |
1147 | } | |
1148 | break; | |
1149 | ||
1150 | case mthc_op: | |
e8f80cc1 | 1151 | if (!cpu_has_mips_r2_r6) |
1ac94400 LY |
1152 | goto sigill; |
1153 | ||
1154 | /* copregister rd <- gpr[rt] */ | |
1155 | SITOHREG(xcp->regs[MIPSInst_RT(ir)], MIPSInst_RD(ir)); | |
1156 | break; | |
1157 | ||
1da177e4 LT |
1158 | case mfc_op: |
1159 | /* copregister rd -> gpr[rt] */ | |
1da177e4 LT |
1160 | if (MIPSInst_RT(ir) != 0) { |
1161 | SIFROMREG(xcp->regs[MIPSInst_RT(ir)], | |
1162 | MIPSInst_RD(ir)); | |
1163 | } | |
1164 | break; | |
1165 | ||
1166 | case mtc_op: | |
1167 | /* copregister rd <- rt */ | |
1da177e4 LT |
1168 | SITOREG(xcp->regs[MIPSInst_RT(ir)], MIPSInst_RD(ir)); |
1169 | break; | |
1170 | ||
3f7cac41 | 1171 | case cfc_op: |
1da177e4 | 1172 | /* cop control register rd -> gpr[rt] */ |
d4f5b088 | 1173 | cop1_cfc(xcp, ctx, ir); |
1da177e4 | 1174 | break; |
1da177e4 | 1175 | |
3f7cac41 | 1176 | case ctc_op: |
1da177e4 | 1177 | /* copregister rd <- rt */ |
d4f5b088 | 1178 | cop1_ctc(xcp, ctx, ir); |
1da177e4 LT |
1179 | if ((ctx->fcr31 >> 5) & ctx->fcr31 & FPU_CSR_ALL_E) { |
1180 | return SIGFPE; | |
1181 | } | |
1182 | break; | |
1da177e4 | 1183 | |
c909ca71 MC |
1184 | case bc1eqz_op: |
1185 | case bc1nez_op: | |
1186 | if (!cpu_has_mips_r6 || delay_slot(xcp)) | |
1187 | return SIGILL; | |
1188 | ||
1189 | cond = likely = 0; | |
1190 | switch (MIPSInst_RS(ir)) { | |
1191 | case bc1eqz_op: | |
1192 | if (get_fpr32(¤t->thread.fpu.fpr[MIPSInst_RT(ir)], 0) & 0x1) | |
1193 | cond = 1; | |
1194 | break; | |
1195 | case bc1nez_op: | |
1196 | if (!(get_fpr32(¤t->thread.fpu.fpr[MIPSInst_RT(ir)], 0) & 0x1)) | |
1197 | cond = 1; | |
1198 | break; | |
1199 | } | |
1200 | goto branch_common; | |
1201 | ||
3f7cac41 | 1202 | case bc_op: |
e7e9cae5 | 1203 | if (delay_slot(xcp)) |
1da177e4 LT |
1204 | return SIGILL; |
1205 | ||
08a07904 RB |
1206 | if (cpu_has_mips_4_5_r) |
1207 | cbit = fpucondbit[MIPSInst_RT(ir) >> 2]; | |
1208 | else | |
1209 | cbit = FPU_CSR_COND; | |
1210 | cond = ctx->fcr31 & cbit; | |
1211 | ||
3f7cac41 | 1212 | likely = 0; |
1da177e4 LT |
1213 | switch (MIPSInst_RT(ir) & 3) { |
1214 | case bcfl_op: | |
2d83fea7 MR |
1215 | if (cpu_has_mips_2_3_4_5_r) |
1216 | likely = 1; | |
1217 | /* Fall through */ | |
1da177e4 LT |
1218 | case bcf_op: |
1219 | cond = !cond; | |
1220 | break; | |
1221 | case bctl_op: | |
2d83fea7 MR |
1222 | if (cpu_has_mips_2_3_4_5_r) |
1223 | likely = 1; | |
1224 | /* Fall through */ | |
1da177e4 LT |
1225 | case bct_op: |
1226 | break; | |
1da177e4 | 1227 | } |
c909ca71 | 1228 | branch_common: |
e7e9cae5 | 1229 | set_delay_slot(xcp); |
1da177e4 | 1230 | if (cond) { |
3f7cac41 RB |
1231 | /* |
1232 | * Branch taken: emulate dslot instruction | |
1da177e4 | 1233 | */ |
9ab4471c MR |
1234 | unsigned long bcpc; |
1235 | ||
1236 | /* | |
1237 | * Remember EPC at the branch to point back | |
1238 | * at so that any delay-slot instruction | |
1239 | * signal is not silently ignored. | |
1240 | */ | |
1241 | bcpc = xcp->cp0_epc; | |
102cedc3 LY |
1242 | xcp->cp0_epc += dec_insn.pc_inc; |
1243 | ||
1244 | contpc = MIPSInst_SIMM(ir); | |
1245 | ir = dec_insn.next_insn; | |
1246 | if (dec_insn.micro_mips_mode) { | |
1247 | contpc = (xcp->cp0_epc + (contpc << 1)); | |
1248 | ||
1249 | /* If 16-bit instruction, not FPU. */ | |
1250 | if ((dec_insn.next_pc_inc == 2) || | |
1251 | (microMIPS32_to_MIPS32((union mips_instruction *)&ir) == SIGILL)) { | |
1252 | ||
1253 | /* | |
1254 | * Since this instruction will | |
1255 | * be put on the stack with | |
1256 | * 32-bit words, get around | |
1257 | * this problem by putting a | |
1258 | * NOP16 as the second one. | |
1259 | */ | |
1260 | if (dec_insn.next_pc_inc == 2) | |
1261 | ir = (ir & (~0xffff)) | MM_NOP16; | |
1262 | ||
1263 | /* | |
1264 | * Single step the non-CP1 | |
1265 | * instruction in the dslot. | |
1266 | */ | |
9ab4471c MR |
1267 | sig = mips_dsemul(xcp, ir, |
1268 | contpc); | |
1269 | if (sig) | |
1270 | xcp->cp0_epc = bcpc; | |
1271 | /* | |
1272 | * SIGILL forces out of | |
1273 | * the emulation loop. | |
1274 | */ | |
1275 | return sig ? sig : SIGILL; | |
102cedc3 LY |
1276 | } |
1277 | } else | |
1278 | contpc = (xcp->cp0_epc + (contpc << 2)); | |
1da177e4 LT |
1279 | |
1280 | switch (MIPSInst_OPCODE(ir)) { | |
1281 | case lwc1_op: | |
1282 | case swc1_op: | |
08a07904 | 1283 | goto emul; |
3f7cac41 | 1284 | |
1da177e4 LT |
1285 | case ldc1_op: |
1286 | case sdc1_op: | |
2d83fea7 | 1287 | if (cpu_has_mips_2_3_4_5_r) |
08a07904 RB |
1288 | goto emul; |
1289 | ||
9ab4471c | 1290 | goto bc_sigill; |
3f7cac41 | 1291 | |
1da177e4 | 1292 | case cop1_op: |
1da177e4 | 1293 | goto emul; |
3f7cac41 | 1294 | |
08a07904 | 1295 | case cop1x_op: |
2d83fea7 | 1296 | if (cpu_has_mips_4_5_64_r2_r6) |
08a07904 RB |
1297 | /* its one of ours */ |
1298 | goto emul; | |
1299 | ||
9ab4471c | 1300 | goto bc_sigill; |
3f7cac41 | 1301 | |
1da177e4 | 1302 | case spec_op: |
2d83fea7 MR |
1303 | switch (MIPSInst_FUNC(ir)) { |
1304 | case movc_op: | |
1305 | if (cpu_has_mips_4_5_r) | |
1306 | goto emul; | |
08a07904 | 1307 | |
9ab4471c | 1308 | goto bc_sigill; |
2d83fea7 | 1309 | } |
1da177e4 | 1310 | break; |
9ab4471c MR |
1311 | |
1312 | bc_sigill: | |
1313 | xcp->cp0_epc = bcpc; | |
1314 | return SIGILL; | |
1da177e4 LT |
1315 | } |
1316 | ||
1317 | /* | |
1318 | * Single step the non-cp1 | |
1319 | * instruction in the dslot | |
1320 | */ | |
9ab4471c MR |
1321 | sig = mips_dsemul(xcp, ir, contpc); |
1322 | if (sig) | |
1323 | xcp->cp0_epc = bcpc; | |
1324 | /* SIGILL forces out of the emulation loop. */ | |
1325 | return sig ? sig : SIGILL; | |
3f7cac41 | 1326 | } else if (likely) { /* branch not taken */ |
5d77cf28 MR |
1327 | /* |
1328 | * branch likely nullifies | |
1329 | * dslot if not taken | |
1330 | */ | |
1331 | xcp->cp0_epc += dec_insn.pc_inc; | |
1332 | contpc += dec_insn.pc_inc; | |
1333 | /* | |
1334 | * else continue & execute | |
1335 | * dslot as normal insn | |
1336 | */ | |
1337 | } | |
1da177e4 | 1338 | break; |
1da177e4 LT |
1339 | |
1340 | default: | |
1341 | if (!(MIPSInst_RS(ir) & 0x10)) | |
1342 | return SIGILL; | |
1da177e4 | 1343 | |
3f7cac41 RB |
1344 | /* a real fpu computation instruction */ |
1345 | if ((sig = fpu_emu(xcp, ctx, ir))) | |
1346 | return sig; | |
1da177e4 LT |
1347 | } |
1348 | break; | |
1349 | ||
3f7cac41 | 1350 | case cop1x_op: |
2d83fea7 | 1351 | if (!cpu_has_mips_4_5_64_r2_r6) |
08a07904 RB |
1352 | return SIGILL; |
1353 | ||
1354 | sig = fpux_emu(xcp, ctx, ir, fault_addr); | |
515b029d | 1355 | if (sig) |
1da177e4 LT |
1356 | return sig; |
1357 | break; | |
1da177e4 | 1358 | |
1da177e4 | 1359 | case spec_op: |
08a07904 RB |
1360 | if (!cpu_has_mips_4_5_r) |
1361 | return SIGILL; | |
1362 | ||
1da177e4 LT |
1363 | if (MIPSInst_FUNC(ir) != movc_op) |
1364 | return SIGILL; | |
1365 | cond = fpucondbit[MIPSInst_RT(ir) >> 2]; | |
1366 | if (((ctx->fcr31 & cond) != 0) == ((MIPSInst_RT(ir) & 1) != 0)) | |
1367 | xcp->regs[MIPSInst_RD(ir)] = | |
1368 | xcp->regs[MIPSInst_RS(ir)]; | |
1369 | break; | |
1da177e4 | 1370 | default: |
1ac94400 | 1371 | sigill: |
1da177e4 LT |
1372 | return SIGILL; |
1373 | } | |
1374 | ||
1375 | /* we did it !! */ | |
e70dfc10 | 1376 | xcp->cp0_epc = contpc; |
e7e9cae5 | 1377 | clear_delay_slot(xcp); |
333d1f67 | 1378 | |
1da177e4 LT |
1379 | return 0; |
1380 | } | |
1381 | ||
1382 | /* | |
1383 | * Conversion table from MIPS compare ops 48-63 | |
1384 | * cond = ieee754dp_cmp(x,y,IEEE754_UN,sig); | |
1385 | */ | |
1386 | static const unsigned char cmptab[8] = { | |
1387 | 0, /* cmp_0 (sig) cmp_sf */ | |
1388 | IEEE754_CUN, /* cmp_un (sig) cmp_ngle */ | |
1389 | IEEE754_CEQ, /* cmp_eq (sig) cmp_seq */ | |
1390 | IEEE754_CEQ | IEEE754_CUN, /* cmp_ueq (sig) cmp_ngl */ | |
1391 | IEEE754_CLT, /* cmp_olt (sig) cmp_lt */ | |
1392 | IEEE754_CLT | IEEE754_CUN, /* cmp_ult (sig) cmp_nge */ | |
1393 | IEEE754_CLT | IEEE754_CEQ, /* cmp_ole (sig) cmp_le */ | |
1394 | IEEE754_CLT | IEEE754_CEQ | IEEE754_CUN, /* cmp_ule (sig) cmp_ngt */ | |
1395 | }; | |
1396 | ||
1397 | ||
1da177e4 LT |
1398 | /* |
1399 | * Additional MIPS4 instructions | |
1400 | */ | |
1401 | ||
47fa0c02 RB |
1402 | #define DEF3OP(name, p, f1, f2, f3) \ |
1403 | static union ieee754##p fpemu_##p##_##name(union ieee754##p r, \ | |
1404 | union ieee754##p s, union ieee754##p t) \ | |
1405 | { \ | |
1406 | struct _ieee754_csr ieee754_csr_save; \ | |
1407 | s = f1(s, t); \ | |
1408 | ieee754_csr_save = ieee754_csr; \ | |
1409 | s = f2(s, r); \ | |
1410 | ieee754_csr_save.cx |= ieee754_csr.cx; \ | |
1411 | ieee754_csr_save.sx |= ieee754_csr.sx; \ | |
1412 | s = f3(s); \ | |
1413 | ieee754_csr.cx |= ieee754_csr_save.cx; \ | |
1414 | ieee754_csr.sx |= ieee754_csr_save.sx; \ | |
1415 | return s; \ | |
1da177e4 LT |
1416 | } |
1417 | ||
2209bcb1 | 1418 | static union ieee754dp fpemu_dp_recip(union ieee754dp d) |
1da177e4 LT |
1419 | { |
1420 | return ieee754dp_div(ieee754dp_one(0), d); | |
1421 | } | |
1422 | ||
2209bcb1 | 1423 | static union ieee754dp fpemu_dp_rsqrt(union ieee754dp d) |
1da177e4 LT |
1424 | { |
1425 | return ieee754dp_div(ieee754dp_one(0), ieee754dp_sqrt(d)); | |
1426 | } | |
1427 | ||
2209bcb1 | 1428 | static union ieee754sp fpemu_sp_recip(union ieee754sp s) |
1da177e4 LT |
1429 | { |
1430 | return ieee754sp_div(ieee754sp_one(0), s); | |
1431 | } | |
1432 | ||
2209bcb1 | 1433 | static union ieee754sp fpemu_sp_rsqrt(union ieee754sp s) |
1da177e4 LT |
1434 | { |
1435 | return ieee754sp_div(ieee754sp_one(0), ieee754sp_sqrt(s)); | |
1436 | } | |
1437 | ||
21a151d8 RB |
1438 | DEF3OP(madd, sp, ieee754sp_mul, ieee754sp_add, ); |
1439 | DEF3OP(msub, sp, ieee754sp_mul, ieee754sp_sub, ); | |
1da177e4 LT |
1440 | DEF3OP(nmadd, sp, ieee754sp_mul, ieee754sp_add, ieee754sp_neg); |
1441 | DEF3OP(nmsub, sp, ieee754sp_mul, ieee754sp_sub, ieee754sp_neg); | |
21a151d8 RB |
1442 | DEF3OP(madd, dp, ieee754dp_mul, ieee754dp_add, ); |
1443 | DEF3OP(msub, dp, ieee754dp_mul, ieee754dp_sub, ); | |
1da177e4 LT |
1444 | DEF3OP(nmadd, dp, ieee754dp_mul, ieee754dp_add, ieee754dp_neg); |
1445 | DEF3OP(nmsub, dp, ieee754dp_mul, ieee754dp_sub, ieee754dp_neg); | |
1446 | ||
eae89076 | 1447 | static int fpux_emu(struct pt_regs *xcp, struct mips_fpu_struct *ctx, |
515b029d | 1448 | mips_instruction ir, void *__user *fault_addr) |
1da177e4 LT |
1449 | { |
1450 | unsigned rcsr = 0; /* resulting csr */ | |
1451 | ||
b6ee75ed | 1452 | MIPS_FPU_EMU_INC_STATS(cp1xops); |
1da177e4 LT |
1453 | |
1454 | switch (MIPSInst_FMA_FFMT(ir)) { | |
1455 | case s_fmt:{ /* 0 */ | |
1456 | ||
2209bcb1 RB |
1457 | union ieee754sp(*handler) (union ieee754sp, union ieee754sp, union ieee754sp); |
1458 | union ieee754sp fd, fr, fs, ft; | |
3fccc015 | 1459 | u32 __user *va; |
1da177e4 LT |
1460 | u32 val; |
1461 | ||
1462 | switch (MIPSInst_FUNC(ir)) { | |
1463 | case lwxc1_op: | |
3fccc015 | 1464 | va = (void __user *) (xcp->regs[MIPSInst_FR(ir)] + |
1da177e4 LT |
1465 | xcp->regs[MIPSInst_FT(ir)]); |
1466 | ||
b6ee75ed | 1467 | MIPS_FPU_EMU_INC_STATS(loads); |
515b029d | 1468 | if (!access_ok(VERIFY_READ, va, sizeof(u32))) { |
b6ee75ed | 1469 | MIPS_FPU_EMU_INC_STATS(errors); |
515b029d | 1470 | *fault_addr = va; |
1da177e4 LT |
1471 | return SIGBUS; |
1472 | } | |
515b029d DD |
1473 | if (__get_user(val, va)) { |
1474 | MIPS_FPU_EMU_INC_STATS(errors); | |
1475 | *fault_addr = va; | |
1476 | return SIGSEGV; | |
1477 | } | |
1da177e4 LT |
1478 | SITOREG(val, MIPSInst_FD(ir)); |
1479 | break; | |
1480 | ||
1481 | case swxc1_op: | |
3fccc015 | 1482 | va = (void __user *) (xcp->regs[MIPSInst_FR(ir)] + |
1da177e4 LT |
1483 | xcp->regs[MIPSInst_FT(ir)]); |
1484 | ||
b6ee75ed | 1485 | MIPS_FPU_EMU_INC_STATS(stores); |
1da177e4 LT |
1486 | |
1487 | SIFROMREG(val, MIPSInst_FS(ir)); | |
515b029d | 1488 | if (!access_ok(VERIFY_WRITE, va, sizeof(u32))) { |
b6ee75ed | 1489 | MIPS_FPU_EMU_INC_STATS(errors); |
515b029d | 1490 | *fault_addr = va; |
1da177e4 LT |
1491 | return SIGBUS; |
1492 | } | |
515b029d DD |
1493 | if (put_user(val, va)) { |
1494 | MIPS_FPU_EMU_INC_STATS(errors); | |
1495 | *fault_addr = va; | |
1496 | return SIGSEGV; | |
1497 | } | |
1da177e4 LT |
1498 | break; |
1499 | ||
1500 | case madd_s_op: | |
1501 | handler = fpemu_sp_madd; | |
1502 | goto scoptop; | |
1503 | case msub_s_op: | |
1504 | handler = fpemu_sp_msub; | |
1505 | goto scoptop; | |
1506 | case nmadd_s_op: | |
1507 | handler = fpemu_sp_nmadd; | |
1508 | goto scoptop; | |
1509 | case nmsub_s_op: | |
1510 | handler = fpemu_sp_nmsub; | |
1511 | goto scoptop; | |
1512 | ||
1513 | scoptop: | |
1514 | SPFROMREG(fr, MIPSInst_FR(ir)); | |
1515 | SPFROMREG(fs, MIPSInst_FS(ir)); | |
1516 | SPFROMREG(ft, MIPSInst_FT(ir)); | |
1517 | fd = (*handler) (fr, fs, ft); | |
1518 | SPTOREG(fd, MIPSInst_FD(ir)); | |
1519 | ||
1520 | copcsr: | |
c4103526 DZ |
1521 | if (ieee754_cxtest(IEEE754_INEXACT)) { |
1522 | MIPS_FPU_EMU_INC_STATS(ieee754_inexact); | |
1da177e4 | 1523 | rcsr |= FPU_CSR_INE_X | FPU_CSR_INE_S; |
c4103526 DZ |
1524 | } |
1525 | if (ieee754_cxtest(IEEE754_UNDERFLOW)) { | |
1526 | MIPS_FPU_EMU_INC_STATS(ieee754_underflow); | |
1da177e4 | 1527 | rcsr |= FPU_CSR_UDF_X | FPU_CSR_UDF_S; |
c4103526 DZ |
1528 | } |
1529 | if (ieee754_cxtest(IEEE754_OVERFLOW)) { | |
1530 | MIPS_FPU_EMU_INC_STATS(ieee754_overflow); | |
1da177e4 | 1531 | rcsr |= FPU_CSR_OVF_X | FPU_CSR_OVF_S; |
c4103526 DZ |
1532 | } |
1533 | if (ieee754_cxtest(IEEE754_INVALID_OPERATION)) { | |
1534 | MIPS_FPU_EMU_INC_STATS(ieee754_invalidop); | |
1da177e4 | 1535 | rcsr |= FPU_CSR_INV_X | FPU_CSR_INV_S; |
c4103526 | 1536 | } |
1da177e4 LT |
1537 | |
1538 | ctx->fcr31 = (ctx->fcr31 & ~FPU_CSR_ALL_X) | rcsr; | |
1da177e4 | 1539 | if ((ctx->fcr31 >> 5) & ctx->fcr31 & FPU_CSR_ALL_E) { |
3f7cac41 | 1540 | /*printk ("SIGFPE: FPU csr = %08x\n", |
1da177e4 LT |
1541 | ctx->fcr31); */ |
1542 | return SIGFPE; | |
1543 | } | |
1544 | ||
1545 | break; | |
1546 | ||
1547 | default: | |
1548 | return SIGILL; | |
1549 | } | |
1550 | break; | |
1551 | } | |
1552 | ||
1da177e4 | 1553 | case d_fmt:{ /* 1 */ |
2209bcb1 RB |
1554 | union ieee754dp(*handler) (union ieee754dp, union ieee754dp, union ieee754dp); |
1555 | union ieee754dp fd, fr, fs, ft; | |
3fccc015 | 1556 | u64 __user *va; |
1da177e4 LT |
1557 | u64 val; |
1558 | ||
1559 | switch (MIPSInst_FUNC(ir)) { | |
1560 | case ldxc1_op: | |
3fccc015 | 1561 | va = (void __user *) (xcp->regs[MIPSInst_FR(ir)] + |
1da177e4 LT |
1562 | xcp->regs[MIPSInst_FT(ir)]); |
1563 | ||
b6ee75ed | 1564 | MIPS_FPU_EMU_INC_STATS(loads); |
515b029d | 1565 | if (!access_ok(VERIFY_READ, va, sizeof(u64))) { |
b6ee75ed | 1566 | MIPS_FPU_EMU_INC_STATS(errors); |
515b029d | 1567 | *fault_addr = va; |
1da177e4 LT |
1568 | return SIGBUS; |
1569 | } | |
515b029d DD |
1570 | if (__get_user(val, va)) { |
1571 | MIPS_FPU_EMU_INC_STATS(errors); | |
1572 | *fault_addr = va; | |
1573 | return SIGSEGV; | |
1574 | } | |
1da177e4 LT |
1575 | DITOREG(val, MIPSInst_FD(ir)); |
1576 | break; | |
1577 | ||
1578 | case sdxc1_op: | |
3fccc015 | 1579 | va = (void __user *) (xcp->regs[MIPSInst_FR(ir)] + |
1da177e4 LT |
1580 | xcp->regs[MIPSInst_FT(ir)]); |
1581 | ||
b6ee75ed | 1582 | MIPS_FPU_EMU_INC_STATS(stores); |
1da177e4 | 1583 | DIFROMREG(val, MIPSInst_FS(ir)); |
515b029d | 1584 | if (!access_ok(VERIFY_WRITE, va, sizeof(u64))) { |
b6ee75ed | 1585 | MIPS_FPU_EMU_INC_STATS(errors); |
515b029d | 1586 | *fault_addr = va; |
1da177e4 LT |
1587 | return SIGBUS; |
1588 | } | |
515b029d DD |
1589 | if (__put_user(val, va)) { |
1590 | MIPS_FPU_EMU_INC_STATS(errors); | |
1591 | *fault_addr = va; | |
1592 | return SIGSEGV; | |
1593 | } | |
1da177e4 LT |
1594 | break; |
1595 | ||
1596 | case madd_d_op: | |
1597 | handler = fpemu_dp_madd; | |
1598 | goto dcoptop; | |
1599 | case msub_d_op: | |
1600 | handler = fpemu_dp_msub; | |
1601 | goto dcoptop; | |
1602 | case nmadd_d_op: | |
1603 | handler = fpemu_dp_nmadd; | |
1604 | goto dcoptop; | |
1605 | case nmsub_d_op: | |
1606 | handler = fpemu_dp_nmsub; | |
1607 | goto dcoptop; | |
1608 | ||
1609 | dcoptop: | |
1610 | DPFROMREG(fr, MIPSInst_FR(ir)); | |
1611 | DPFROMREG(fs, MIPSInst_FS(ir)); | |
1612 | DPFROMREG(ft, MIPSInst_FT(ir)); | |
1613 | fd = (*handler) (fr, fs, ft); | |
1614 | DPTOREG(fd, MIPSInst_FD(ir)); | |
1615 | goto copcsr; | |
1616 | ||
1617 | default: | |
1618 | return SIGILL; | |
1619 | } | |
1620 | break; | |
1621 | } | |
1da177e4 | 1622 | |
51061b88 DZ |
1623 | case 0x3: |
1624 | if (MIPSInst_FUNC(ir) != pfetch_op) | |
1da177e4 | 1625 | return SIGILL; |
51061b88 | 1626 | |
1da177e4 LT |
1627 | /* ignore prefx operation */ |
1628 | break; | |
1629 | ||
1630 | default: | |
1631 | return SIGILL; | |
1632 | } | |
1633 | ||
1634 | return 0; | |
1635 | } | |
1da177e4 LT |
1636 | |
1637 | ||
1638 | ||
1639 | /* | |
1640 | * Emulate a single COP1 arithmetic instruction. | |
1641 | */ | |
eae89076 | 1642 | static int fpu_emu(struct pt_regs *xcp, struct mips_fpu_struct *ctx, |
1da177e4 LT |
1643 | mips_instruction ir) |
1644 | { | |
1645 | int rfmt; /* resulting format */ | |
1646 | unsigned rcsr = 0; /* resulting csr */ | |
3f7cac41 RB |
1647 | unsigned int oldrm; |
1648 | unsigned int cbit; | |
1da177e4 LT |
1649 | unsigned cond; |
1650 | union { | |
2209bcb1 RB |
1651 | union ieee754dp d; |
1652 | union ieee754sp s; | |
1da177e4 | 1653 | int w; |
1da177e4 | 1654 | s64 l; |
1da177e4 | 1655 | } rv; /* resulting value */ |
3f7cac41 | 1656 | u64 bits; |
1da177e4 | 1657 | |
b6ee75ed | 1658 | MIPS_FPU_EMU_INC_STATS(cp1ops); |
1da177e4 | 1659 | switch (rfmt = (MIPSInst_FFMT(ir) & 0xf)) { |
3f7cac41 | 1660 | case s_fmt: { /* 0 */ |
1da177e4 | 1661 | union { |
2209bcb1 RB |
1662 | union ieee754sp(*b) (union ieee754sp, union ieee754sp); |
1663 | union ieee754sp(*u) (union ieee754sp); | |
1da177e4 | 1664 | } handler; |
3f7cac41 | 1665 | union ieee754sp fs, ft; |
1da177e4 LT |
1666 | |
1667 | switch (MIPSInst_FUNC(ir)) { | |
1668 | /* binary ops */ | |
1669 | case fadd_op: | |
1670 | handler.b = ieee754sp_add; | |
1671 | goto scopbop; | |
1672 | case fsub_op: | |
1673 | handler.b = ieee754sp_sub; | |
1674 | goto scopbop; | |
1675 | case fmul_op: | |
1676 | handler.b = ieee754sp_mul; | |
1677 | goto scopbop; | |
1678 | case fdiv_op: | |
1679 | handler.b = ieee754sp_div; | |
1680 | goto scopbop; | |
1681 | ||
1682 | /* unary ops */ | |
1da177e4 | 1683 | case fsqrt_op: |
2d83fea7 | 1684 | if (!cpu_has_mips_2_3_4_5_r) |
08a07904 RB |
1685 | return SIGILL; |
1686 | ||
1da177e4 LT |
1687 | handler.u = ieee754sp_sqrt; |
1688 | goto scopuop; | |
3f7cac41 | 1689 | |
08a07904 RB |
1690 | /* |
1691 | * Note that on some MIPS IV implementations such as the | |
1692 | * R5000 and R8000 the FSQRT and FRECIP instructions do not | |
1693 | * achieve full IEEE-754 accuracy - however this emulator does. | |
1694 | */ | |
1da177e4 | 1695 | case frsqrt_op: |
2d83fea7 | 1696 | if (!cpu_has_mips_4_5_64_r2_r6) |
08a07904 RB |
1697 | return SIGILL; |
1698 | ||
1da177e4 LT |
1699 | handler.u = fpemu_sp_rsqrt; |
1700 | goto scopuop; | |
3f7cac41 | 1701 | |
1da177e4 | 1702 | case frecip_op: |
2d83fea7 | 1703 | if (!cpu_has_mips_4_5_64_r2_r6) |
08a07904 RB |
1704 | return SIGILL; |
1705 | ||
1da177e4 LT |
1706 | handler.u = fpemu_sp_recip; |
1707 | goto scopuop; | |
08a07904 | 1708 | |
1da177e4 | 1709 | case fmovc_op: |
08a07904 RB |
1710 | if (!cpu_has_mips_4_5_r) |
1711 | return SIGILL; | |
1712 | ||
1da177e4 LT |
1713 | cond = fpucondbit[MIPSInst_FT(ir) >> 2]; |
1714 | if (((ctx->fcr31 & cond) != 0) != | |
1715 | ((MIPSInst_FT(ir) & 1) != 0)) | |
1716 | return 0; | |
1717 | SPFROMREG(rv.s, MIPSInst_FS(ir)); | |
1718 | break; | |
3f7cac41 | 1719 | |
1da177e4 | 1720 | case fmovz_op: |
08a07904 RB |
1721 | if (!cpu_has_mips_4_5_r) |
1722 | return SIGILL; | |
1723 | ||
1da177e4 LT |
1724 | if (xcp->regs[MIPSInst_FT(ir)] != 0) |
1725 | return 0; | |
1726 | SPFROMREG(rv.s, MIPSInst_FS(ir)); | |
1727 | break; | |
3f7cac41 | 1728 | |
1da177e4 | 1729 | case fmovn_op: |
08a07904 RB |
1730 | if (!cpu_has_mips_4_5_r) |
1731 | return SIGILL; | |
1732 | ||
1da177e4 LT |
1733 | if (xcp->regs[MIPSInst_FT(ir)] == 0) |
1734 | return 0; | |
1735 | SPFROMREG(rv.s, MIPSInst_FS(ir)); | |
1736 | break; | |
3f7cac41 | 1737 | |
1da177e4 LT |
1738 | case fabs_op: |
1739 | handler.u = ieee754sp_abs; | |
1740 | goto scopuop; | |
3f7cac41 | 1741 | |
1da177e4 LT |
1742 | case fneg_op: |
1743 | handler.u = ieee754sp_neg; | |
1744 | goto scopuop; | |
3f7cac41 | 1745 | |
1da177e4 LT |
1746 | case fmov_op: |
1747 | /* an easy one */ | |
1748 | SPFROMREG(rv.s, MIPSInst_FS(ir)); | |
1749 | goto copcsr; | |
1750 | ||
1751 | /* binary op on handler */ | |
3f7cac41 RB |
1752 | scopbop: |
1753 | SPFROMREG(fs, MIPSInst_FS(ir)); | |
1754 | SPFROMREG(ft, MIPSInst_FT(ir)); | |
1da177e4 | 1755 | |
3f7cac41 RB |
1756 | rv.s = (*handler.b) (fs, ft); |
1757 | goto copcsr; | |
1758 | scopuop: | |
1759 | SPFROMREG(fs, MIPSInst_FS(ir)); | |
1760 | rv.s = (*handler.u) (fs); | |
1761 | goto copcsr; | |
1762 | copcsr: | |
c4103526 DZ |
1763 | if (ieee754_cxtest(IEEE754_INEXACT)) { |
1764 | MIPS_FPU_EMU_INC_STATS(ieee754_inexact); | |
1da177e4 | 1765 | rcsr |= FPU_CSR_INE_X | FPU_CSR_INE_S; |
c4103526 DZ |
1766 | } |
1767 | if (ieee754_cxtest(IEEE754_UNDERFLOW)) { | |
1768 | MIPS_FPU_EMU_INC_STATS(ieee754_underflow); | |
1da177e4 | 1769 | rcsr |= FPU_CSR_UDF_X | FPU_CSR_UDF_S; |
c4103526 DZ |
1770 | } |
1771 | if (ieee754_cxtest(IEEE754_OVERFLOW)) { | |
1772 | MIPS_FPU_EMU_INC_STATS(ieee754_overflow); | |
1da177e4 | 1773 | rcsr |= FPU_CSR_OVF_X | FPU_CSR_OVF_S; |
c4103526 DZ |
1774 | } |
1775 | if (ieee754_cxtest(IEEE754_ZERO_DIVIDE)) { | |
1776 | MIPS_FPU_EMU_INC_STATS(ieee754_zerodiv); | |
1da177e4 | 1777 | rcsr |= FPU_CSR_DIV_X | FPU_CSR_DIV_S; |
c4103526 DZ |
1778 | } |
1779 | if (ieee754_cxtest(IEEE754_INVALID_OPERATION)) { | |
1780 | MIPS_FPU_EMU_INC_STATS(ieee754_invalidop); | |
1da177e4 | 1781 | rcsr |= FPU_CSR_INV_X | FPU_CSR_INV_S; |
c4103526 | 1782 | } |
1da177e4 LT |
1783 | break; |
1784 | ||
1785 | /* unary conv ops */ | |
1786 | case fcvts_op: | |
1787 | return SIGILL; /* not defined */ | |
1da177e4 | 1788 | |
3f7cac41 | 1789 | case fcvtd_op: |
1da177e4 LT |
1790 | SPFROMREG(fs, MIPSInst_FS(ir)); |
1791 | rv.d = ieee754dp_fsp(fs); | |
1792 | rfmt = d_fmt; | |
1793 | goto copcsr; | |
1da177e4 | 1794 | |
3f7cac41 | 1795 | case fcvtw_op: |
1da177e4 LT |
1796 | SPFROMREG(fs, MIPSInst_FS(ir)); |
1797 | rv.w = ieee754sp_tint(fs); | |
1798 | rfmt = w_fmt; | |
1799 | goto copcsr; | |
1da177e4 | 1800 | |
1da177e4 LT |
1801 | case fround_op: |
1802 | case ftrunc_op: | |
1803 | case fceil_op: | |
3f7cac41 | 1804 | case ffloor_op: |
2d83fea7 | 1805 | if (!cpu_has_mips_2_3_4_5_r) |
08a07904 RB |
1806 | return SIGILL; |
1807 | ||
3f7cac41 | 1808 | oldrm = ieee754_csr.rm; |
1da177e4 | 1809 | SPFROMREG(fs, MIPSInst_FS(ir)); |
2cfcf8a8 | 1810 | ieee754_csr.rm = MIPSInst_FUNC(ir); |
1da177e4 LT |
1811 | rv.w = ieee754sp_tint(fs); |
1812 | ieee754_csr.rm = oldrm; | |
1813 | rfmt = w_fmt; | |
1814 | goto copcsr; | |
1da177e4 | 1815 | |
3f7cac41 | 1816 | case fcvtl_op: |
2d83fea7 | 1817 | if (!cpu_has_mips_3_4_5_64_r2_r6) |
08a07904 RB |
1818 | return SIGILL; |
1819 | ||
1da177e4 LT |
1820 | SPFROMREG(fs, MIPSInst_FS(ir)); |
1821 | rv.l = ieee754sp_tlong(fs); | |
1822 | rfmt = l_fmt; | |
1823 | goto copcsr; | |
1da177e4 LT |
1824 | |
1825 | case froundl_op: | |
1826 | case ftruncl_op: | |
1827 | case fceill_op: | |
3f7cac41 | 1828 | case ffloorl_op: |
2d83fea7 | 1829 | if (!cpu_has_mips_3_4_5_64_r2_r6) |
08a07904 RB |
1830 | return SIGILL; |
1831 | ||
3f7cac41 | 1832 | oldrm = ieee754_csr.rm; |
1da177e4 | 1833 | SPFROMREG(fs, MIPSInst_FS(ir)); |
2cfcf8a8 | 1834 | ieee754_csr.rm = MIPSInst_FUNC(ir); |
1da177e4 LT |
1835 | rv.l = ieee754sp_tlong(fs); |
1836 | ieee754_csr.rm = oldrm; | |
1837 | rfmt = l_fmt; | |
1838 | goto copcsr; | |
1da177e4 LT |
1839 | |
1840 | default: | |
1841 | if (MIPSInst_FUNC(ir) >= fcmp_op) { | |
1842 | unsigned cmpop = MIPSInst_FUNC(ir) - fcmp_op; | |
2209bcb1 | 1843 | union ieee754sp fs, ft; |
1da177e4 LT |
1844 | |
1845 | SPFROMREG(fs, MIPSInst_FS(ir)); | |
1846 | SPFROMREG(ft, MIPSInst_FT(ir)); | |
1847 | rv.w = ieee754sp_cmp(fs, ft, | |
1848 | cmptab[cmpop & 0x7], cmpop & 0x8); | |
1849 | rfmt = -1; | |
1850 | if ((cmpop & 0x8) && ieee754_cxtest | |
1851 | (IEEE754_INVALID_OPERATION)) | |
1852 | rcsr = FPU_CSR_INV_X | FPU_CSR_INV_S; | |
1853 | else | |
1854 | goto copcsr; | |
1855 | ||
3f7cac41 | 1856 | } else |
1da177e4 | 1857 | return SIGILL; |
1da177e4 LT |
1858 | break; |
1859 | } | |
1860 | break; | |
1861 | } | |
1862 | ||
3f7cac41 RB |
1863 | case d_fmt: { |
1864 | union ieee754dp fs, ft; | |
1da177e4 | 1865 | union { |
2209bcb1 RB |
1866 | union ieee754dp(*b) (union ieee754dp, union ieee754dp); |
1867 | union ieee754dp(*u) (union ieee754dp); | |
1da177e4 LT |
1868 | } handler; |
1869 | ||
1870 | switch (MIPSInst_FUNC(ir)) { | |
1871 | /* binary ops */ | |
1872 | case fadd_op: | |
1873 | handler.b = ieee754dp_add; | |
1874 | goto dcopbop; | |
1875 | case fsub_op: | |
1876 | handler.b = ieee754dp_sub; | |
1877 | goto dcopbop; | |
1878 | case fmul_op: | |
1879 | handler.b = ieee754dp_mul; | |
1880 | goto dcopbop; | |
1881 | case fdiv_op: | |
1882 | handler.b = ieee754dp_div; | |
1883 | goto dcopbop; | |
1884 | ||
1885 | /* unary ops */ | |
1da177e4 | 1886 | case fsqrt_op: |
08a07904 RB |
1887 | if (!cpu_has_mips_2_3_4_5_r) |
1888 | return SIGILL; | |
1889 | ||
1da177e4 LT |
1890 | handler.u = ieee754dp_sqrt; |
1891 | goto dcopuop; | |
08a07904 RB |
1892 | /* |
1893 | * Note that on some MIPS IV implementations such as the | |
1894 | * R5000 and R8000 the FSQRT and FRECIP instructions do not | |
1895 | * achieve full IEEE-754 accuracy - however this emulator does. | |
1896 | */ | |
1da177e4 | 1897 | case frsqrt_op: |
2d83fea7 | 1898 | if (!cpu_has_mips_4_5_64_r2_r6) |
08a07904 RB |
1899 | return SIGILL; |
1900 | ||
1da177e4 LT |
1901 | handler.u = fpemu_dp_rsqrt; |
1902 | goto dcopuop; | |
1903 | case frecip_op: | |
2d83fea7 | 1904 | if (!cpu_has_mips_4_5_64_r2_r6) |
08a07904 RB |
1905 | return SIGILL; |
1906 | ||
1da177e4 LT |
1907 | handler.u = fpemu_dp_recip; |
1908 | goto dcopuop; | |
1da177e4 | 1909 | case fmovc_op: |
08a07904 RB |
1910 | if (!cpu_has_mips_4_5_r) |
1911 | return SIGILL; | |
1912 | ||
1da177e4 LT |
1913 | cond = fpucondbit[MIPSInst_FT(ir) >> 2]; |
1914 | if (((ctx->fcr31 & cond) != 0) != | |
1915 | ((MIPSInst_FT(ir) & 1) != 0)) | |
1916 | return 0; | |
1917 | DPFROMREG(rv.d, MIPSInst_FS(ir)); | |
1918 | break; | |
1919 | case fmovz_op: | |
08a07904 RB |
1920 | if (!cpu_has_mips_4_5_r) |
1921 | return SIGILL; | |
1922 | ||
1da177e4 LT |
1923 | if (xcp->regs[MIPSInst_FT(ir)] != 0) |
1924 | return 0; | |
1925 | DPFROMREG(rv.d, MIPSInst_FS(ir)); | |
1926 | break; | |
1927 | case fmovn_op: | |
08a07904 RB |
1928 | if (!cpu_has_mips_4_5_r) |
1929 | return SIGILL; | |
1930 | ||
1da177e4 LT |
1931 | if (xcp->regs[MIPSInst_FT(ir)] == 0) |
1932 | return 0; | |
1933 | DPFROMREG(rv.d, MIPSInst_FS(ir)); | |
1934 | break; | |
1da177e4 LT |
1935 | case fabs_op: |
1936 | handler.u = ieee754dp_abs; | |
1937 | goto dcopuop; | |
1938 | ||
1939 | case fneg_op: | |
1940 | handler.u = ieee754dp_neg; | |
1941 | goto dcopuop; | |
1942 | ||
1943 | case fmov_op: | |
1944 | /* an easy one */ | |
1945 | DPFROMREG(rv.d, MIPSInst_FS(ir)); | |
1946 | goto copcsr; | |
1947 | ||
1948 | /* binary op on handler */ | |
3f7cac41 RB |
1949 | dcopbop: |
1950 | DPFROMREG(fs, MIPSInst_FS(ir)); | |
1951 | DPFROMREG(ft, MIPSInst_FT(ir)); | |
1da177e4 | 1952 | |
3f7cac41 RB |
1953 | rv.d = (*handler.b) (fs, ft); |
1954 | goto copcsr; | |
1955 | dcopuop: | |
1956 | DPFROMREG(fs, MIPSInst_FS(ir)); | |
1957 | rv.d = (*handler.u) (fs); | |
1958 | goto copcsr; | |
1da177e4 | 1959 | |
3f7cac41 RB |
1960 | /* |
1961 | * unary conv ops | |
1962 | */ | |
1963 | case fcvts_op: | |
1da177e4 LT |
1964 | DPFROMREG(fs, MIPSInst_FS(ir)); |
1965 | rv.s = ieee754sp_fdp(fs); | |
1966 | rfmt = s_fmt; | |
1967 | goto copcsr; | |
3f7cac41 | 1968 | |
1da177e4 LT |
1969 | case fcvtd_op: |
1970 | return SIGILL; /* not defined */ | |
1971 | ||
3f7cac41 | 1972 | case fcvtw_op: |
1da177e4 LT |
1973 | DPFROMREG(fs, MIPSInst_FS(ir)); |
1974 | rv.w = ieee754dp_tint(fs); /* wrong */ | |
1975 | rfmt = w_fmt; | |
1976 | goto copcsr; | |
1da177e4 | 1977 | |
1da177e4 LT |
1978 | case fround_op: |
1979 | case ftrunc_op: | |
1980 | case fceil_op: | |
3f7cac41 | 1981 | case ffloor_op: |
08a07904 RB |
1982 | if (!cpu_has_mips_2_3_4_5_r) |
1983 | return SIGILL; | |
1984 | ||
3f7cac41 | 1985 | oldrm = ieee754_csr.rm; |
1da177e4 | 1986 | DPFROMREG(fs, MIPSInst_FS(ir)); |
2cfcf8a8 | 1987 | ieee754_csr.rm = MIPSInst_FUNC(ir); |
1da177e4 LT |
1988 | rv.w = ieee754dp_tint(fs); |
1989 | ieee754_csr.rm = oldrm; | |
1990 | rfmt = w_fmt; | |
1991 | goto copcsr; | |
1da177e4 | 1992 | |
3f7cac41 | 1993 | case fcvtl_op: |
2d83fea7 | 1994 | if (!cpu_has_mips_3_4_5_64_r2_r6) |
08a07904 RB |
1995 | return SIGILL; |
1996 | ||
1da177e4 LT |
1997 | DPFROMREG(fs, MIPSInst_FS(ir)); |
1998 | rv.l = ieee754dp_tlong(fs); | |
1999 | rfmt = l_fmt; | |
2000 | goto copcsr; | |
1da177e4 LT |
2001 | |
2002 | case froundl_op: | |
2003 | case ftruncl_op: | |
2004 | case fceill_op: | |
3f7cac41 | 2005 | case ffloorl_op: |
2d83fea7 | 2006 | if (!cpu_has_mips_3_4_5_64_r2_r6) |
08a07904 RB |
2007 | return SIGILL; |
2008 | ||
3f7cac41 | 2009 | oldrm = ieee754_csr.rm; |
1da177e4 | 2010 | DPFROMREG(fs, MIPSInst_FS(ir)); |
2cfcf8a8 | 2011 | ieee754_csr.rm = MIPSInst_FUNC(ir); |
1da177e4 LT |
2012 | rv.l = ieee754dp_tlong(fs); |
2013 | ieee754_csr.rm = oldrm; | |
2014 | rfmt = l_fmt; | |
2015 | goto copcsr; | |
1da177e4 LT |
2016 | |
2017 | default: | |
2018 | if (MIPSInst_FUNC(ir) >= fcmp_op) { | |
2019 | unsigned cmpop = MIPSInst_FUNC(ir) - fcmp_op; | |
2209bcb1 | 2020 | union ieee754dp fs, ft; |
1da177e4 LT |
2021 | |
2022 | DPFROMREG(fs, MIPSInst_FS(ir)); | |
2023 | DPFROMREG(ft, MIPSInst_FT(ir)); | |
2024 | rv.w = ieee754dp_cmp(fs, ft, | |
2025 | cmptab[cmpop & 0x7], cmpop & 0x8); | |
2026 | rfmt = -1; | |
2027 | if ((cmpop & 0x8) | |
2028 | && | |
2029 | ieee754_cxtest | |
2030 | (IEEE754_INVALID_OPERATION)) | |
2031 | rcsr = FPU_CSR_INV_X | FPU_CSR_INV_S; | |
2032 | else | |
2033 | goto copcsr; | |
2034 | ||
2035 | } | |
2036 | else { | |
2037 | return SIGILL; | |
2038 | } | |
2039 | break; | |
2040 | } | |
2041 | break; | |
bbdd8147 MC |
2042 | } |
2043 | ||
2044 | case w_fmt: { | |
2045 | union ieee754dp fs; | |
1da177e4 LT |
2046 | |
2047 | switch (MIPSInst_FUNC(ir)) { | |
2048 | case fcvts_op: | |
2049 | /* convert word to single precision real */ | |
2050 | SPFROMREG(fs, MIPSInst_FS(ir)); | |
2051 | rv.s = ieee754sp_fint(fs.bits); | |
2052 | rfmt = s_fmt; | |
2053 | goto copcsr; | |
1da177e4 LT |
2054 | case fcvtd_op: |
2055 | /* convert word to double precision real */ | |
2056 | SPFROMREG(fs, MIPSInst_FS(ir)); | |
2057 | rv.d = ieee754dp_fint(fs.bits); | |
2058 | rfmt = d_fmt; | |
2059 | goto copcsr; | |
1da177e4 LT |
2060 | default: |
2061 | return SIGILL; | |
2062 | } | |
2063 | break; | |
2064 | } | |
2065 | ||
3f7cac41 | 2066 | case l_fmt: |
08a07904 | 2067 | |
2d83fea7 | 2068 | if (!cpu_has_mips_3_4_5_64_r2_r6) |
08a07904 RB |
2069 | return SIGILL; |
2070 | ||
bbd426f5 PB |
2071 | DIFROMREG(bits, MIPSInst_FS(ir)); |
2072 | ||
1da177e4 LT |
2073 | switch (MIPSInst_FUNC(ir)) { |
2074 | case fcvts_op: | |
2075 | /* convert long to single precision real */ | |
bbd426f5 | 2076 | rv.s = ieee754sp_flong(bits); |
1da177e4 LT |
2077 | rfmt = s_fmt; |
2078 | goto copcsr; | |
2079 | case fcvtd_op: | |
2080 | /* convert long to double precision real */ | |
bbd426f5 | 2081 | rv.d = ieee754dp_flong(bits); |
1da177e4 LT |
2082 | rfmt = d_fmt; |
2083 | goto copcsr; | |
2084 | default: | |
2085 | return SIGILL; | |
2086 | } | |
2087 | break; | |
1da177e4 LT |
2088 | |
2089 | default: | |
2090 | return SIGILL; | |
2091 | } | |
2092 | ||
2093 | /* | |
2094 | * Update the fpu CSR register for this operation. | |
2095 | * If an exception is required, generate a tidy SIGFPE exception, | |
2096 | * without updating the result register. | |
2097 | * Note: cause exception bits do not accumulate, they are rewritten | |
2098 | * for each op; only the flag/sticky bits accumulate. | |
2099 | */ | |
2100 | ctx->fcr31 = (ctx->fcr31 & ~FPU_CSR_ALL_X) | rcsr; | |
2101 | if ((ctx->fcr31 >> 5) & ctx->fcr31 & FPU_CSR_ALL_E) { | |
3f7cac41 | 2102 | /*printk ("SIGFPE: FPU csr = %08x\n",ctx->fcr31); */ |
1da177e4 LT |
2103 | return SIGFPE; |
2104 | } | |
2105 | ||
2106 | /* | |
2107 | * Now we can safely write the result back to the register file. | |
2108 | */ | |
2109 | switch (rfmt) { | |
08a07904 RB |
2110 | case -1: |
2111 | ||
2112 | if (cpu_has_mips_4_5_r) | |
c3b9b945 | 2113 | cbit = fpucondbit[MIPSInst_FD(ir) >> 2]; |
08a07904 RB |
2114 | else |
2115 | cbit = FPU_CSR_COND; | |
1da177e4 | 2116 | if (rv.w) |
08a07904 | 2117 | ctx->fcr31 |= cbit; |
1da177e4 | 2118 | else |
08a07904 | 2119 | ctx->fcr31 &= ~cbit; |
1da177e4 | 2120 | break; |
08a07904 | 2121 | |
1da177e4 LT |
2122 | case d_fmt: |
2123 | DPTOREG(rv.d, MIPSInst_FD(ir)); | |
2124 | break; | |
1da177e4 LT |
2125 | case s_fmt: |
2126 | SPTOREG(rv.s, MIPSInst_FD(ir)); | |
2127 | break; | |
2128 | case w_fmt: | |
2129 | SITOREG(rv.w, MIPSInst_FD(ir)); | |
2130 | break; | |
1da177e4 | 2131 | case l_fmt: |
2d83fea7 | 2132 | if (!cpu_has_mips_3_4_5_64_r2_r6) |
08a07904 RB |
2133 | return SIGILL; |
2134 | ||
1da177e4 LT |
2135 | DITOREG(rv.l, MIPSInst_FD(ir)); |
2136 | break; | |
1da177e4 LT |
2137 | default: |
2138 | return SIGILL; | |
2139 | } | |
2140 | ||
2141 | return 0; | |
2142 | } | |
2143 | ||
e04582b7 | 2144 | int fpu_emulator_cop1Handler(struct pt_regs *xcp, struct mips_fpu_struct *ctx, |
515b029d | 2145 | int has_fpu, void *__user *fault_addr) |
1da177e4 | 2146 | { |
333d1f67 | 2147 | unsigned long oldepc, prevepc; |
102cedc3 LY |
2148 | struct mm_decoded_insn dec_insn; |
2149 | u16 instr[4]; | |
2150 | u16 *instr_ptr; | |
1da177e4 LT |
2151 | int sig = 0; |
2152 | ||
2153 | oldepc = xcp->cp0_epc; | |
2154 | do { | |
2155 | prevepc = xcp->cp0_epc; | |
2156 | ||
102cedc3 LY |
2157 | if (get_isa16_mode(prevepc) && cpu_has_mmips) { |
2158 | /* | |
2159 | * Get next 2 microMIPS instructions and convert them | |
2160 | * into 32-bit instructions. | |
2161 | */ | |
2162 | if ((get_user(instr[0], (u16 __user *)msk_isa16_mode(xcp->cp0_epc))) || | |
2163 | (get_user(instr[1], (u16 __user *)msk_isa16_mode(xcp->cp0_epc + 2))) || | |
2164 | (get_user(instr[2], (u16 __user *)msk_isa16_mode(xcp->cp0_epc + 4))) || | |
2165 | (get_user(instr[3], (u16 __user *)msk_isa16_mode(xcp->cp0_epc + 6)))) { | |
2166 | MIPS_FPU_EMU_INC_STATS(errors); | |
2167 | return SIGBUS; | |
2168 | } | |
2169 | instr_ptr = instr; | |
2170 | ||
2171 | /* Get first instruction. */ | |
2172 | if (mm_insn_16bit(*instr_ptr)) { | |
2173 | /* Duplicate the half-word. */ | |
2174 | dec_insn.insn = (*instr_ptr << 16) | | |
2175 | (*instr_ptr); | |
2176 | /* 16-bit instruction. */ | |
2177 | dec_insn.pc_inc = 2; | |
2178 | instr_ptr += 1; | |
2179 | } else { | |
2180 | dec_insn.insn = (*instr_ptr << 16) | | |
2181 | *(instr_ptr+1); | |
2182 | /* 32-bit instruction. */ | |
2183 | dec_insn.pc_inc = 4; | |
2184 | instr_ptr += 2; | |
2185 | } | |
2186 | /* Get second instruction. */ | |
2187 | if (mm_insn_16bit(*instr_ptr)) { | |
2188 | /* Duplicate the half-word. */ | |
2189 | dec_insn.next_insn = (*instr_ptr << 16) | | |
2190 | (*instr_ptr); | |
2191 | /* 16-bit instruction. */ | |
2192 | dec_insn.next_pc_inc = 2; | |
2193 | } else { | |
2194 | dec_insn.next_insn = (*instr_ptr << 16) | | |
2195 | *(instr_ptr+1); | |
2196 | /* 32-bit instruction. */ | |
2197 | dec_insn.next_pc_inc = 4; | |
2198 | } | |
2199 | dec_insn.micro_mips_mode = 1; | |
2200 | } else { | |
2201 | if ((get_user(dec_insn.insn, | |
2202 | (mips_instruction __user *) xcp->cp0_epc)) || | |
2203 | (get_user(dec_insn.next_insn, | |
2204 | (mips_instruction __user *)(xcp->cp0_epc+4)))) { | |
2205 | MIPS_FPU_EMU_INC_STATS(errors); | |
2206 | return SIGBUS; | |
2207 | } | |
2208 | dec_insn.pc_inc = 4; | |
2209 | dec_insn.next_pc_inc = 4; | |
2210 | dec_insn.micro_mips_mode = 0; | |
515b029d | 2211 | } |
102cedc3 LY |
2212 | |
2213 | if ((dec_insn.insn == 0) || | |
2214 | ((dec_insn.pc_inc == 2) && | |
2215 | ((dec_insn.insn & 0xffff) == MM_NOP16))) | |
2216 | xcp->cp0_epc += dec_insn.pc_inc; /* Skip NOPs */ | |
1da177e4 | 2217 | else { |
cd21dfcf | 2218 | /* |
2cfcf8a8 MR |
2219 | * The 'ieee754_csr' is an alias of ctx->fcr31. |
2220 | * No need to copy ctx->fcr31 to ieee754_csr. | |
cd21dfcf | 2221 | */ |
102cedc3 | 2222 | sig = cop1Emulate(xcp, ctx, dec_insn, fault_addr); |
1da177e4 LT |
2223 | } |
2224 | ||
e04582b7 | 2225 | if (has_fpu) |
1da177e4 LT |
2226 | break; |
2227 | if (sig) | |
2228 | break; | |
2229 | ||
2230 | cond_resched(); | |
2231 | } while (xcp->cp0_epc > prevepc); | |
2232 | ||
2233 | /* SIGILL indicates a non-fpu instruction */ | |
2234 | if (sig == SIGILL && xcp->cp0_epc != oldepc) | |
3f7cac41 | 2235 | /* but if EPC has advanced, then ignore it */ |
1da177e4 LT |
2236 | sig = 0; |
2237 | ||
2238 | return sig; | |
2239 | } |