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9d5a6349 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 | 2 | /* |
3f7cac41 | 3 | * cp1emu.c: a MIPS coprocessor 1 (FPU) instruction emulator |
1da177e4 LT |
4 | * |
5 | * MIPS floating point support | |
6 | * Copyright (C) 1994-2000 Algorithmics Ltd. | |
1da177e4 LT |
7 | * |
8 | * Kevin D. Kissell, kevink@mips.com and Carsten Langgaard, carstenl@mips.com | |
9 | * Copyright (C) 2000 MIPS Technologies, Inc. | |
10 | * | |
1da177e4 LT |
11 | * A complete emulator for MIPS coprocessor 1 instructions. This is |
12 | * required for #float(switch) or #float(trap), where it catches all | |
13 | * COP1 instructions via the "CoProcessor Unusable" exception. | |
14 | * | |
15 | * More surprisingly it is also required for #float(ieee), to help out | |
3f7cac41 | 16 | * the hardware FPU at the boundaries of the IEEE-754 representation |
1da177e4 LT |
17 | * (denormalised values, infinities, underflow, etc). It is made |
18 | * quite nasty because emulation of some non-COP1 instructions is | |
19 | * required, e.g. in branch delay slots. | |
20 | * | |
3f7cac41 | 21 | * Note if you know that you won't have an FPU, then you'll get much |
1da177e4 LT |
22 | * better performance by compiling with -msoft-float! |
23 | */ | |
24 | #include <linux/sched.h> | |
83fd38ca | 25 | #include <linux/debugfs.h> |
85c51c51 | 26 | #include <linux/percpu-defs.h> |
7f788d2d | 27 | #include <linux/perf_event.h> |
1da177e4 | 28 | |
cd8ee345 | 29 | #include <asm/branch.h> |
1da177e4 | 30 | #include <asm/inst.h> |
1da177e4 LT |
31 | #include <asm/ptrace.h> |
32 | #include <asm/signal.h> | |
7c0f6ba6 | 33 | #include <linux/uaccess.h> |
cd8ee345 | 34 | |
f6843626 | 35 | #include <asm/cpu-info.h> |
cd8ee345 | 36 | #include <asm/processor.h> |
1da177e4 | 37 | #include <asm/fpu_emulator.h> |
102cedc3 | 38 | #include <asm/fpu.h> |
b0a668fb | 39 | #include <asm/mips-r2-to-r6-emul.h> |
1da177e4 LT |
40 | |
41 | #include "ieee754.h" | |
1da177e4 | 42 | |
1da177e4 LT |
43 | /* Function which emulates a floating point instruction. */ |
44 | ||
eae89076 | 45 | static int fpu_emu(struct pt_regs *, struct mips_fpu_struct *, |
1da177e4 LT |
46 | mips_instruction); |
47 | ||
1da177e4 | 48 | static int fpux_emu(struct pt_regs *, |
445a58ce | 49 | struct mips_fpu_struct *, mips_instruction, void __user **); |
1da177e4 | 50 | |
1da177e4 LT |
51 | /* Control registers */ |
52 | ||
53 | #define FPCREG_RID 0 /* $0 = revision id */ | |
c491cfa2 MR |
54 | #define FPCREG_FCCR 25 /* $25 = fccr */ |
55 | #define FPCREG_FEXR 26 /* $26 = fexr */ | |
56 | #define FPCREG_FENR 28 /* $28 = fenr */ | |
1da177e4 LT |
57 | #define FPCREG_CSR 31 /* $31 = csr */ |
58 | ||
1da177e4 | 59 | /* convert condition code register number to csr bit */ |
b0a668fb | 60 | const unsigned int fpucondbit[8] = { |
c491cfa2 | 61 | FPU_CSR_COND, |
1da177e4 LT |
62 | FPU_CSR_COND1, |
63 | FPU_CSR_COND2, | |
64 | FPU_CSR_COND3, | |
65 | FPU_CSR_COND4, | |
66 | FPU_CSR_COND5, | |
67 | FPU_CSR_COND6, | |
68 | FPU_CSR_COND7 | |
69 | }; | |
1da177e4 | 70 | |
102cedc3 LY |
71 | /* (microMIPS) Convert certain microMIPS instructions to MIPS32 format. */ |
72 | static const int sd_format[] = {16, 17, 0, 0, 0, 0, 0, 0}; | |
73 | static const int sdps_format[] = {16, 17, 22, 0, 0, 0, 0, 0}; | |
74 | static const int dwl_format[] = {17, 20, 21, 0, 0, 0, 0, 0}; | |
75 | static const int swl_format[] = {16, 20, 21, 0, 0, 0, 0, 0}; | |
76 | ||
77 | /* | |
78 | * This functions translates a 32-bit microMIPS instruction | |
79 | * into a 32-bit MIPS32 instruction. Returns 0 on success | |
80 | * and SIGILL otherwise. | |
81 | */ | |
82 | static int microMIPS32_to_MIPS32(union mips_instruction *insn_ptr) | |
83 | { | |
84 | union mips_instruction insn = *insn_ptr; | |
85 | union mips_instruction mips32_insn = insn; | |
86 | int func, fmt, op; | |
87 | ||
88 | switch (insn.mm_i_format.opcode) { | |
89 | case mm_ldc132_op: | |
90 | mips32_insn.mm_i_format.opcode = ldc1_op; | |
91 | mips32_insn.mm_i_format.rt = insn.mm_i_format.rs; | |
92 | mips32_insn.mm_i_format.rs = insn.mm_i_format.rt; | |
93 | break; | |
94 | case mm_lwc132_op: | |
95 | mips32_insn.mm_i_format.opcode = lwc1_op; | |
96 | mips32_insn.mm_i_format.rt = insn.mm_i_format.rs; | |
97 | mips32_insn.mm_i_format.rs = insn.mm_i_format.rt; | |
98 | break; | |
99 | case mm_sdc132_op: | |
100 | mips32_insn.mm_i_format.opcode = sdc1_op; | |
101 | mips32_insn.mm_i_format.rt = insn.mm_i_format.rs; | |
102 | mips32_insn.mm_i_format.rs = insn.mm_i_format.rt; | |
103 | break; | |
104 | case mm_swc132_op: | |
105 | mips32_insn.mm_i_format.opcode = swc1_op; | |
106 | mips32_insn.mm_i_format.rt = insn.mm_i_format.rs; | |
107 | mips32_insn.mm_i_format.rs = insn.mm_i_format.rt; | |
108 | break; | |
109 | case mm_pool32i_op: | |
110 | /* NOTE: offset is << by 1 if in microMIPS mode. */ | |
111 | if ((insn.mm_i_format.rt == mm_bc1f_op) || | |
112 | (insn.mm_i_format.rt == mm_bc1t_op)) { | |
113 | mips32_insn.fb_format.opcode = cop1_op; | |
114 | mips32_insn.fb_format.bc = bc_op; | |
115 | mips32_insn.fb_format.flag = | |
116 | (insn.mm_i_format.rt == mm_bc1t_op) ? 1 : 0; | |
117 | } else | |
118 | return SIGILL; | |
119 | break; | |
120 | case mm_pool32f_op: | |
121 | switch (insn.mm_fp0_format.func) { | |
122 | case mm_32f_01_op: | |
123 | case mm_32f_11_op: | |
124 | case mm_32f_02_op: | |
125 | case mm_32f_12_op: | |
126 | case mm_32f_41_op: | |
127 | case mm_32f_51_op: | |
128 | case mm_32f_42_op: | |
129 | case mm_32f_52_op: | |
130 | op = insn.mm_fp0_format.func; | |
131 | if (op == mm_32f_01_op) | |
132 | func = madd_s_op; | |
133 | else if (op == mm_32f_11_op) | |
134 | func = madd_d_op; | |
135 | else if (op == mm_32f_02_op) | |
136 | func = nmadd_s_op; | |
137 | else if (op == mm_32f_12_op) | |
138 | func = nmadd_d_op; | |
139 | else if (op == mm_32f_41_op) | |
140 | func = msub_s_op; | |
141 | else if (op == mm_32f_51_op) | |
142 | func = msub_d_op; | |
143 | else if (op == mm_32f_42_op) | |
144 | func = nmsub_s_op; | |
145 | else | |
146 | func = nmsub_d_op; | |
147 | mips32_insn.fp6_format.opcode = cop1x_op; | |
148 | mips32_insn.fp6_format.fr = insn.mm_fp6_format.fr; | |
149 | mips32_insn.fp6_format.ft = insn.mm_fp6_format.ft; | |
150 | mips32_insn.fp6_format.fs = insn.mm_fp6_format.fs; | |
151 | mips32_insn.fp6_format.fd = insn.mm_fp6_format.fd; | |
152 | mips32_insn.fp6_format.func = func; | |
153 | break; | |
154 | case mm_32f_10_op: | |
155 | func = -1; /* Invalid */ | |
156 | op = insn.mm_fp5_format.op & 0x7; | |
157 | if (op == mm_ldxc1_op) | |
158 | func = ldxc1_op; | |
159 | else if (op == mm_sdxc1_op) | |
160 | func = sdxc1_op; | |
161 | else if (op == mm_lwxc1_op) | |
162 | func = lwxc1_op; | |
163 | else if (op == mm_swxc1_op) | |
164 | func = swxc1_op; | |
165 | ||
166 | if (func != -1) { | |
167 | mips32_insn.r_format.opcode = cop1x_op; | |
168 | mips32_insn.r_format.rs = | |
169 | insn.mm_fp5_format.base; | |
170 | mips32_insn.r_format.rt = | |
171 | insn.mm_fp5_format.index; | |
172 | mips32_insn.r_format.rd = 0; | |
173 | mips32_insn.r_format.re = insn.mm_fp5_format.fd; | |
174 | mips32_insn.r_format.func = func; | |
175 | } else | |
176 | return SIGILL; | |
177 | break; | |
178 | case mm_32f_40_op: | |
179 | op = -1; /* Invalid */ | |
180 | if (insn.mm_fp2_format.op == mm_fmovt_op) | |
181 | op = 1; | |
182 | else if (insn.mm_fp2_format.op == mm_fmovf_op) | |
183 | op = 0; | |
184 | if (op != -1) { | |
185 | mips32_insn.fp0_format.opcode = cop1_op; | |
186 | mips32_insn.fp0_format.fmt = | |
187 | sdps_format[insn.mm_fp2_format.fmt]; | |
188 | mips32_insn.fp0_format.ft = | |
189 | (insn.mm_fp2_format.cc<<2) + op; | |
190 | mips32_insn.fp0_format.fs = | |
191 | insn.mm_fp2_format.fs; | |
192 | mips32_insn.fp0_format.fd = | |
193 | insn.mm_fp2_format.fd; | |
194 | mips32_insn.fp0_format.func = fmovc_op; | |
195 | } else | |
196 | return SIGILL; | |
197 | break; | |
198 | case mm_32f_60_op: | |
199 | func = -1; /* Invalid */ | |
200 | if (insn.mm_fp0_format.op == mm_fadd_op) | |
201 | func = fadd_op; | |
202 | else if (insn.mm_fp0_format.op == mm_fsub_op) | |
203 | func = fsub_op; | |
204 | else if (insn.mm_fp0_format.op == mm_fmul_op) | |
205 | func = fmul_op; | |
206 | else if (insn.mm_fp0_format.op == mm_fdiv_op) | |
207 | func = fdiv_op; | |
208 | if (func != -1) { | |
209 | mips32_insn.fp0_format.opcode = cop1_op; | |
210 | mips32_insn.fp0_format.fmt = | |
211 | sdps_format[insn.mm_fp0_format.fmt]; | |
212 | mips32_insn.fp0_format.ft = | |
213 | insn.mm_fp0_format.ft; | |
214 | mips32_insn.fp0_format.fs = | |
215 | insn.mm_fp0_format.fs; | |
216 | mips32_insn.fp0_format.fd = | |
217 | insn.mm_fp0_format.fd; | |
218 | mips32_insn.fp0_format.func = func; | |
219 | } else | |
220 | return SIGILL; | |
221 | break; | |
222 | case mm_32f_70_op: | |
223 | func = -1; /* Invalid */ | |
224 | if (insn.mm_fp0_format.op == mm_fmovn_op) | |
225 | func = fmovn_op; | |
226 | else if (insn.mm_fp0_format.op == mm_fmovz_op) | |
227 | func = fmovz_op; | |
228 | if (func != -1) { | |
229 | mips32_insn.fp0_format.opcode = cop1_op; | |
230 | mips32_insn.fp0_format.fmt = | |
231 | sdps_format[insn.mm_fp0_format.fmt]; | |
232 | mips32_insn.fp0_format.ft = | |
233 | insn.mm_fp0_format.ft; | |
234 | mips32_insn.fp0_format.fs = | |
235 | insn.mm_fp0_format.fs; | |
236 | mips32_insn.fp0_format.fd = | |
237 | insn.mm_fp0_format.fd; | |
238 | mips32_insn.fp0_format.func = func; | |
239 | } else | |
240 | return SIGILL; | |
241 | break; | |
242 | case mm_32f_73_op: /* POOL32FXF */ | |
243 | switch (insn.mm_fp1_format.op) { | |
244 | case mm_movf0_op: | |
245 | case mm_movf1_op: | |
246 | case mm_movt0_op: | |
247 | case mm_movt1_op: | |
248 | if ((insn.mm_fp1_format.op & 0x7f) == | |
249 | mm_movf0_op) | |
250 | op = 0; | |
251 | else | |
252 | op = 1; | |
253 | mips32_insn.r_format.opcode = spec_op; | |
254 | mips32_insn.r_format.rs = insn.mm_fp4_format.fs; | |
255 | mips32_insn.r_format.rt = | |
256 | (insn.mm_fp4_format.cc << 2) + op; | |
257 | mips32_insn.r_format.rd = insn.mm_fp4_format.rt; | |
258 | mips32_insn.r_format.re = 0; | |
259 | mips32_insn.r_format.func = movc_op; | |
260 | break; | |
261 | case mm_fcvtd0_op: | |
262 | case mm_fcvtd1_op: | |
263 | case mm_fcvts0_op: | |
264 | case mm_fcvts1_op: | |
265 | if ((insn.mm_fp1_format.op & 0x7f) == | |
266 | mm_fcvtd0_op) { | |
267 | func = fcvtd_op; | |
268 | fmt = swl_format[insn.mm_fp3_format.fmt]; | |
269 | } else { | |
270 | func = fcvts_op; | |
271 | fmt = dwl_format[insn.mm_fp3_format.fmt]; | |
272 | } | |
273 | mips32_insn.fp0_format.opcode = cop1_op; | |
274 | mips32_insn.fp0_format.fmt = fmt; | |
275 | mips32_insn.fp0_format.ft = 0; | |
276 | mips32_insn.fp0_format.fs = | |
277 | insn.mm_fp3_format.fs; | |
278 | mips32_insn.fp0_format.fd = | |
279 | insn.mm_fp3_format.rt; | |
280 | mips32_insn.fp0_format.func = func; | |
281 | break; | |
282 | case mm_fmov0_op: | |
283 | case mm_fmov1_op: | |
284 | case mm_fabs0_op: | |
285 | case mm_fabs1_op: | |
286 | case mm_fneg0_op: | |
287 | case mm_fneg1_op: | |
288 | if ((insn.mm_fp1_format.op & 0x7f) == | |
289 | mm_fmov0_op) | |
290 | func = fmov_op; | |
291 | else if ((insn.mm_fp1_format.op & 0x7f) == | |
292 | mm_fabs0_op) | |
293 | func = fabs_op; | |
294 | else | |
295 | func = fneg_op; | |
296 | mips32_insn.fp0_format.opcode = cop1_op; | |
297 | mips32_insn.fp0_format.fmt = | |
298 | sdps_format[insn.mm_fp3_format.fmt]; | |
299 | mips32_insn.fp0_format.ft = 0; | |
300 | mips32_insn.fp0_format.fs = | |
301 | insn.mm_fp3_format.fs; | |
302 | mips32_insn.fp0_format.fd = | |
303 | insn.mm_fp3_format.rt; | |
304 | mips32_insn.fp0_format.func = func; | |
305 | break; | |
306 | case mm_ffloorl_op: | |
307 | case mm_ffloorw_op: | |
308 | case mm_fceill_op: | |
309 | case mm_fceilw_op: | |
310 | case mm_ftruncl_op: | |
311 | case mm_ftruncw_op: | |
312 | case mm_froundl_op: | |
313 | case mm_froundw_op: | |
314 | case mm_fcvtl_op: | |
315 | case mm_fcvtw_op: | |
316 | if (insn.mm_fp1_format.op == mm_ffloorl_op) | |
317 | func = ffloorl_op; | |
318 | else if (insn.mm_fp1_format.op == mm_ffloorw_op) | |
319 | func = ffloor_op; | |
320 | else if (insn.mm_fp1_format.op == mm_fceill_op) | |
321 | func = fceill_op; | |
322 | else if (insn.mm_fp1_format.op == mm_fceilw_op) | |
323 | func = fceil_op; | |
324 | else if (insn.mm_fp1_format.op == mm_ftruncl_op) | |
325 | func = ftruncl_op; | |
326 | else if (insn.mm_fp1_format.op == mm_ftruncw_op) | |
327 | func = ftrunc_op; | |
328 | else if (insn.mm_fp1_format.op == mm_froundl_op) | |
329 | func = froundl_op; | |
330 | else if (insn.mm_fp1_format.op == mm_froundw_op) | |
331 | func = fround_op; | |
332 | else if (insn.mm_fp1_format.op == mm_fcvtl_op) | |
333 | func = fcvtl_op; | |
334 | else | |
335 | func = fcvtw_op; | |
336 | mips32_insn.fp0_format.opcode = cop1_op; | |
337 | mips32_insn.fp0_format.fmt = | |
338 | sd_format[insn.mm_fp1_format.fmt]; | |
339 | mips32_insn.fp0_format.ft = 0; | |
340 | mips32_insn.fp0_format.fs = | |
341 | insn.mm_fp1_format.fs; | |
342 | mips32_insn.fp0_format.fd = | |
343 | insn.mm_fp1_format.rt; | |
344 | mips32_insn.fp0_format.func = func; | |
345 | break; | |
346 | case mm_frsqrt_op: | |
347 | case mm_fsqrt_op: | |
348 | case mm_frecip_op: | |
349 | if (insn.mm_fp1_format.op == mm_frsqrt_op) | |
350 | func = frsqrt_op; | |
351 | else if (insn.mm_fp1_format.op == mm_fsqrt_op) | |
352 | func = fsqrt_op; | |
353 | else | |
354 | func = frecip_op; | |
355 | mips32_insn.fp0_format.opcode = cop1_op; | |
356 | mips32_insn.fp0_format.fmt = | |
357 | sdps_format[insn.mm_fp1_format.fmt]; | |
358 | mips32_insn.fp0_format.ft = 0; | |
359 | mips32_insn.fp0_format.fs = | |
360 | insn.mm_fp1_format.fs; | |
361 | mips32_insn.fp0_format.fd = | |
362 | insn.mm_fp1_format.rt; | |
363 | mips32_insn.fp0_format.func = func; | |
364 | break; | |
365 | case mm_mfc1_op: | |
366 | case mm_mtc1_op: | |
367 | case mm_cfc1_op: | |
368 | case mm_ctc1_op: | |
9355e59c SH |
369 | case mm_mfhc1_op: |
370 | case mm_mthc1_op: | |
102cedc3 LY |
371 | if (insn.mm_fp1_format.op == mm_mfc1_op) |
372 | op = mfc_op; | |
373 | else if (insn.mm_fp1_format.op == mm_mtc1_op) | |
374 | op = mtc_op; | |
375 | else if (insn.mm_fp1_format.op == mm_cfc1_op) | |
376 | op = cfc_op; | |
9355e59c | 377 | else if (insn.mm_fp1_format.op == mm_ctc1_op) |
102cedc3 | 378 | op = ctc_op; |
9355e59c SH |
379 | else if (insn.mm_fp1_format.op == mm_mfhc1_op) |
380 | op = mfhc_op; | |
381 | else | |
382 | op = mthc_op; | |
102cedc3 LY |
383 | mips32_insn.fp1_format.opcode = cop1_op; |
384 | mips32_insn.fp1_format.op = op; | |
385 | mips32_insn.fp1_format.rt = | |
386 | insn.mm_fp1_format.rt; | |
387 | mips32_insn.fp1_format.fs = | |
388 | insn.mm_fp1_format.fs; | |
389 | mips32_insn.fp1_format.fd = 0; | |
390 | mips32_insn.fp1_format.func = 0; | |
391 | break; | |
392 | default: | |
393 | return SIGILL; | |
102cedc3 LY |
394 | } |
395 | break; | |
396 | case mm_32f_74_op: /* c.cond.fmt */ | |
397 | mips32_insn.fp0_format.opcode = cop1_op; | |
398 | mips32_insn.fp0_format.fmt = | |
399 | sdps_format[insn.mm_fp4_format.fmt]; | |
400 | mips32_insn.fp0_format.ft = insn.mm_fp4_format.rt; | |
401 | mips32_insn.fp0_format.fs = insn.mm_fp4_format.fs; | |
402 | mips32_insn.fp0_format.fd = insn.mm_fp4_format.cc << 2; | |
403 | mips32_insn.fp0_format.func = | |
404 | insn.mm_fp4_format.cond | MM_MIPS32_COND_FC; | |
405 | break; | |
406 | default: | |
407 | return SIGILL; | |
102cedc3 LY |
408 | } |
409 | break; | |
410 | default: | |
411 | return SIGILL; | |
102cedc3 LY |
412 | } |
413 | ||
414 | *insn_ptr = mips32_insn; | |
415 | return 0; | |
416 | } | |
417 | ||
1da177e4 LT |
418 | /* |
419 | * Redundant with logic already in kernel/branch.c, | |
420 | * embedded in compute_return_epc. At some point, | |
421 | * a single subroutine should be used across both | |
422 | * modules. | |
423 | */ | |
432c6bac PB |
424 | int isBranchInstr(struct pt_regs *regs, struct mm_decoded_insn dec_insn, |
425 | unsigned long *contpc) | |
1da177e4 | 426 | { |
102cedc3 LY |
427 | union mips_instruction insn = (union mips_instruction)dec_insn.insn; |
428 | unsigned int fcr31; | |
429 | unsigned int bit = 0; | |
8bcd84a4 DL |
430 | unsigned int bit0; |
431 | union fpureg *fpr; | |
102cedc3 LY |
432 | |
433 | switch (insn.i_format.opcode) { | |
1da177e4 | 434 | case spec_op: |
102cedc3 | 435 | switch (insn.r_format.func) { |
1da177e4 | 436 | case jalr_op: |
ab4a92e6 PB |
437 | if (insn.r_format.rd != 0) { |
438 | regs->regs[insn.r_format.rd] = | |
439 | regs->cp0_epc + dec_insn.pc_inc + | |
440 | dec_insn.next_pc_inc; | |
441 | } | |
2a14b21a | 442 | /* fall through */ |
1da177e4 | 443 | case jr_op: |
5f9f41c4 | 444 | /* For R6, JR already emulated in jalr_op */ |
143fefc8 | 445 | if (NO_R6EMU && insn.r_format.func == jr_op) |
5f9f41c4 | 446 | break; |
102cedc3 | 447 | *contpc = regs->regs[insn.r_format.rs]; |
1da177e4 LT |
448 | return 1; |
449 | } | |
450 | break; | |
1da177e4 | 451 | case bcond_op: |
102cedc3 LY |
452 | switch (insn.i_format.rt) { |
453 | case bltzal_op: | |
454 | case bltzall_op: | |
319824ea MC |
455 | if (NO_R6EMU && (insn.i_format.rs || |
456 | insn.i_format.rt == bltzall_op)) | |
457 | break; | |
458 | ||
102cedc3 LY |
459 | regs->regs[31] = regs->cp0_epc + |
460 | dec_insn.pc_inc + | |
461 | dec_insn.next_pc_inc; | |
2a14b21a | 462 | /* fall through */ |
1da177e4 | 463 | case bltzl_op: |
319824ea MC |
464 | if (NO_R6EMU) |
465 | break; | |
2a14b21a | 466 | /* fall through */ |
319824ea | 467 | case bltz_op: |
102cedc3 LY |
468 | if ((long)regs->regs[insn.i_format.rs] < 0) |
469 | *contpc = regs->cp0_epc + | |
470 | dec_insn.pc_inc + | |
471 | (insn.i_format.simmediate << 2); | |
472 | else | |
473 | *contpc = regs->cp0_epc + | |
474 | dec_insn.pc_inc + | |
475 | dec_insn.next_pc_inc; | |
476 | return 1; | |
1da177e4 | 477 | case bgezal_op: |
1da177e4 | 478 | case bgezall_op: |
319824ea MC |
479 | if (NO_R6EMU && (insn.i_format.rs || |
480 | insn.i_format.rt == bgezall_op)) | |
481 | break; | |
482 | ||
102cedc3 LY |
483 | regs->regs[31] = regs->cp0_epc + |
484 | dec_insn.pc_inc + | |
485 | dec_insn.next_pc_inc; | |
2a14b21a | 486 | /* fall through */ |
102cedc3 | 487 | case bgezl_op: |
319824ea MC |
488 | if (NO_R6EMU) |
489 | break; | |
2a14b21a | 490 | /* fall through */ |
319824ea | 491 | case bgez_op: |
102cedc3 LY |
492 | if ((long)regs->regs[insn.i_format.rs] >= 0) |
493 | *contpc = regs->cp0_epc + | |
494 | dec_insn.pc_inc + | |
495 | (insn.i_format.simmediate << 2); | |
496 | else | |
497 | *contpc = regs->cp0_epc + | |
498 | dec_insn.pc_inc + | |
499 | dec_insn.next_pc_inc; | |
1da177e4 LT |
500 | return 1; |
501 | } | |
502 | break; | |
1da177e4 | 503 | case jalx_op: |
102cedc3 | 504 | set_isa16_mode(bit); |
2a14b21a | 505 | /* fall through */ |
102cedc3 LY |
506 | case jal_op: |
507 | regs->regs[31] = regs->cp0_epc + | |
508 | dec_insn.pc_inc + | |
509 | dec_insn.next_pc_inc; | |
2a14b21a | 510 | /* fall through */ |
102cedc3 LY |
511 | case j_op: |
512 | *contpc = regs->cp0_epc + dec_insn.pc_inc; | |
513 | *contpc >>= 28; | |
514 | *contpc <<= 28; | |
515 | *contpc |= (insn.j_format.target << 2); | |
516 | /* Set microMIPS mode bit: XOR for jalx. */ | |
517 | *contpc ^= bit; | |
518 | return 1; | |
1da177e4 | 519 | case beql_op: |
319824ea MC |
520 | if (NO_R6EMU) |
521 | break; | |
2a14b21a | 522 | /* fall through */ |
319824ea | 523 | case beq_op: |
102cedc3 LY |
524 | if (regs->regs[insn.i_format.rs] == |
525 | regs->regs[insn.i_format.rt]) | |
526 | *contpc = regs->cp0_epc + | |
527 | dec_insn.pc_inc + | |
528 | (insn.i_format.simmediate << 2); | |
529 | else | |
530 | *contpc = regs->cp0_epc + | |
531 | dec_insn.pc_inc + | |
532 | dec_insn.next_pc_inc; | |
533 | return 1; | |
1da177e4 | 534 | case bnel_op: |
319824ea MC |
535 | if (NO_R6EMU) |
536 | break; | |
2a14b21a | 537 | /* fall through */ |
319824ea | 538 | case bne_op: |
102cedc3 LY |
539 | if (regs->regs[insn.i_format.rs] != |
540 | regs->regs[insn.i_format.rt]) | |
541 | *contpc = regs->cp0_epc + | |
542 | dec_insn.pc_inc + | |
543 | (insn.i_format.simmediate << 2); | |
544 | else | |
545 | *contpc = regs->cp0_epc + | |
546 | dec_insn.pc_inc + | |
547 | dec_insn.next_pc_inc; | |
548 | return 1; | |
1da177e4 | 549 | case blezl_op: |
e9d92d22 | 550 | if (!insn.i_format.rt && NO_R6EMU) |
319824ea | 551 | break; |
2a14b21a | 552 | /* fall through */ |
319824ea | 553 | case blez_op: |
a8ff66f5 MC |
554 | |
555 | /* | |
556 | * Compact branches for R6 for the | |
557 | * blez and blezl opcodes. | |
558 | * BLEZ | rs = 0 | rt != 0 == BLEZALC | |
559 | * BLEZ | rs = rt != 0 == BGEZALC | |
560 | * BLEZ | rs != 0 | rt != 0 == BGEUC | |
561 | * BLEZL | rs = 0 | rt != 0 == BLEZC | |
562 | * BLEZL | rs = rt != 0 == BGEZC | |
563 | * BLEZL | rs != 0 | rt != 0 == BGEC | |
564 | * | |
565 | * For real BLEZ{,L}, rt is always 0. | |
566 | */ | |
567 | if (cpu_has_mips_r6 && insn.i_format.rt) { | |
568 | if ((insn.i_format.opcode == blez_op) && | |
569 | ((!insn.i_format.rs && insn.i_format.rt) || | |
570 | (insn.i_format.rs == insn.i_format.rt))) | |
571 | regs->regs[31] = regs->cp0_epc + | |
572 | dec_insn.pc_inc; | |
573 | *contpc = regs->cp0_epc + dec_insn.pc_inc + | |
574 | dec_insn.next_pc_inc; | |
575 | ||
576 | return 1; | |
577 | } | |
102cedc3 LY |
578 | if ((long)regs->regs[insn.i_format.rs] <= 0) |
579 | *contpc = regs->cp0_epc + | |
580 | dec_insn.pc_inc + | |
581 | (insn.i_format.simmediate << 2); | |
582 | else | |
583 | *contpc = regs->cp0_epc + | |
584 | dec_insn.pc_inc + | |
585 | dec_insn.next_pc_inc; | |
586 | return 1; | |
1da177e4 | 587 | case bgtzl_op: |
e9d92d22 | 588 | if (!insn.i_format.rt && NO_R6EMU) |
319824ea | 589 | break; |
2a14b21a | 590 | /* fall through */ |
319824ea | 591 | case bgtz_op: |
f1b44067 MC |
592 | /* |
593 | * Compact branches for R6 for the | |
594 | * bgtz and bgtzl opcodes. | |
595 | * BGTZ | rs = 0 | rt != 0 == BGTZALC | |
596 | * BGTZ | rs = rt != 0 == BLTZALC | |
597 | * BGTZ | rs != 0 | rt != 0 == BLTUC | |
598 | * BGTZL | rs = 0 | rt != 0 == BGTZC | |
599 | * BGTZL | rs = rt != 0 == BLTZC | |
600 | * BGTZL | rs != 0 | rt != 0 == BLTC | |
601 | * | |
602 | * *ZALC varint for BGTZ &&& rt != 0 | |
603 | * For real GTZ{,L}, rt is always 0. | |
604 | */ | |
605 | if (cpu_has_mips_r6 && insn.i_format.rt) { | |
606 | if ((insn.i_format.opcode == blez_op) && | |
607 | ((!insn.i_format.rs && insn.i_format.rt) || | |
608 | (insn.i_format.rs == insn.i_format.rt))) | |
609 | regs->regs[31] = regs->cp0_epc + | |
610 | dec_insn.pc_inc; | |
611 | *contpc = regs->cp0_epc + dec_insn.pc_inc + | |
612 | dec_insn.next_pc_inc; | |
613 | ||
614 | return 1; | |
615 | } | |
616 | ||
102cedc3 LY |
617 | if ((long)regs->regs[insn.i_format.rs] > 0) |
618 | *contpc = regs->cp0_epc + | |
619 | dec_insn.pc_inc + | |
620 | (insn.i_format.simmediate << 2); | |
621 | else | |
622 | *contpc = regs->cp0_epc + | |
623 | dec_insn.pc_inc + | |
624 | dec_insn.next_pc_inc; | |
1da177e4 | 625 | return 1; |
1b492600 PB |
626 | case pop10_op: |
627 | case pop30_op: | |
c893ce38 MC |
628 | if (!cpu_has_mips_r6) |
629 | break; | |
630 | if (insn.i_format.rt && !insn.i_format.rs) | |
631 | regs->regs[31] = regs->cp0_epc + 4; | |
632 | *contpc = regs->cp0_epc + dec_insn.pc_inc + | |
633 | dec_insn.next_pc_inc; | |
634 | ||
635 | return 1; | |
c26d4219 DD |
636 | #ifdef CONFIG_CPU_CAVIUM_OCTEON |
637 | case lwc2_op: /* This is bbit0 on Octeon */ | |
638 | if ((regs->regs[insn.i_format.rs] & (1ull<<insn.i_format.rt)) == 0) | |
639 | *contpc = regs->cp0_epc + 4 + (insn.i_format.simmediate << 2); | |
640 | else | |
641 | *contpc = regs->cp0_epc + 8; | |
642 | return 1; | |
643 | case ldc2_op: /* This is bbit032 on Octeon */ | |
644 | if ((regs->regs[insn.i_format.rs] & (1ull<<(insn.i_format.rt + 32))) == 0) | |
645 | *contpc = regs->cp0_epc + 4 + (insn.i_format.simmediate << 2); | |
646 | else | |
647 | *contpc = regs->cp0_epc + 8; | |
648 | return 1; | |
649 | case swc2_op: /* This is bbit1 on Octeon */ | |
650 | if (regs->regs[insn.i_format.rs] & (1ull<<insn.i_format.rt)) | |
651 | *contpc = regs->cp0_epc + 4 + (insn.i_format.simmediate << 2); | |
652 | else | |
653 | *contpc = regs->cp0_epc + 8; | |
654 | return 1; | |
655 | case sdc2_op: /* This is bbit132 on Octeon */ | |
656 | if (regs->regs[insn.i_format.rs] & (1ull<<(insn.i_format.rt + 32))) | |
657 | *contpc = regs->cp0_epc + 4 + (insn.i_format.simmediate << 2); | |
658 | else | |
659 | *contpc = regs->cp0_epc + 8; | |
660 | return 1; | |
8467ca01 MC |
661 | #else |
662 | case bc6_op: | |
663 | /* | |
664 | * Only valid for MIPS R6 but we can still end up | |
665 | * here from a broken userland so just tell emulator | |
666 | * this is not a branch and let it break later on. | |
667 | */ | |
668 | if (!cpu_has_mips_r6) | |
669 | break; | |
670 | *contpc = regs->cp0_epc + dec_insn.pc_inc + | |
671 | dec_insn.next_pc_inc; | |
672 | ||
84fef630 MC |
673 | return 1; |
674 | case balc6_op: | |
675 | if (!cpu_has_mips_r6) | |
676 | break; | |
677 | regs->regs[31] = regs->cp0_epc + 4; | |
678 | *contpc = regs->cp0_epc + dec_insn.pc_inc + | |
679 | dec_insn.next_pc_inc; | |
680 | ||
69b9a2fd | 681 | return 1; |
1c66b79b | 682 | case pop66_op: |
69b9a2fd MC |
683 | if (!cpu_has_mips_r6) |
684 | break; | |
685 | *contpc = regs->cp0_epc + dec_insn.pc_inc + | |
686 | dec_insn.next_pc_inc; | |
687 | ||
28d6f93d | 688 | return 1; |
1c66b79b | 689 | case pop76_op: |
28d6f93d MC |
690 | if (!cpu_has_mips_r6) |
691 | break; | |
692 | if (!insn.i_format.rs) | |
693 | regs->regs[31] = regs->cp0_epc + 4; | |
694 | *contpc = regs->cp0_epc + dec_insn.pc_inc + | |
695 | dec_insn.next_pc_inc; | |
696 | ||
8467ca01 | 697 | return 1; |
c26d4219 | 698 | #endif |
1da177e4 LT |
699 | case cop0_op: |
700 | case cop1_op: | |
c8a34581 MC |
701 | /* Need to check for R6 bc1nez and bc1eqz branches */ |
702 | if (cpu_has_mips_r6 && | |
703 | ((insn.i_format.rs == bc1eqz_op) || | |
704 | (insn.i_format.rs == bc1nez_op))) { | |
705 | bit = 0; | |
8bcd84a4 DL |
706 | fpr = ¤t->thread.fpu.fpr[insn.i_format.rt]; |
707 | bit0 = get_fpr32(fpr, 0) & 0x1; | |
c8a34581 MC |
708 | switch (insn.i_format.rs) { |
709 | case bc1eqz_op: | |
8bcd84a4 | 710 | bit = bit0 == 0; |
c8a34581 MC |
711 | break; |
712 | case bc1nez_op: | |
8bcd84a4 | 713 | bit = bit0 != 0; |
c8a34581 MC |
714 | break; |
715 | } | |
716 | if (bit) | |
717 | *contpc = regs->cp0_epc + | |
718 | dec_insn.pc_inc + | |
719 | (insn.i_format.simmediate << 2); | |
720 | else | |
721 | *contpc = regs->cp0_epc + | |
722 | dec_insn.pc_inc + | |
723 | dec_insn.next_pc_inc; | |
724 | ||
725 | return 1; | |
726 | } | |
2a14b21a AM |
727 | /* R2/R6 compatible cop1 instruction */ |
728 | /* fall through */ | |
1da177e4 LT |
729 | case cop2_op: |
730 | case cop1x_op: | |
102cedc3 LY |
731 | if (insn.i_format.rs == bc_op) { |
732 | preempt_disable(); | |
733 | if (is_fpu_owner()) | |
842dfc11 | 734 | fcr31 = read_32bit_cp1_register(CP1_STATUS); |
102cedc3 LY |
735 | else |
736 | fcr31 = current->thread.fpu.fcr31; | |
737 | preempt_enable(); | |
738 | ||
739 | bit = (insn.i_format.rt >> 2); | |
740 | bit += (bit != 0); | |
741 | bit += 23; | |
742 | switch (insn.i_format.rt & 3) { | |
743 | case 0: /* bc1f */ | |
744 | case 2: /* bc1fl */ | |
745 | if (~fcr31 & (1 << bit)) | |
746 | *contpc = regs->cp0_epc + | |
747 | dec_insn.pc_inc + | |
748 | (insn.i_format.simmediate << 2); | |
749 | else | |
750 | *contpc = regs->cp0_epc + | |
751 | dec_insn.pc_inc + | |
752 | dec_insn.next_pc_inc; | |
753 | return 1; | |
102cedc3 LY |
754 | case 1: /* bc1t */ |
755 | case 3: /* bc1tl */ | |
756 | if (fcr31 & (1 << bit)) | |
757 | *contpc = regs->cp0_epc + | |
758 | dec_insn.pc_inc + | |
759 | (insn.i_format.simmediate << 2); | |
760 | else | |
761 | *contpc = regs->cp0_epc + | |
762 | dec_insn.pc_inc + | |
763 | dec_insn.next_pc_inc; | |
764 | return 1; | |
102cedc3 LY |
765 | } |
766 | } | |
1da177e4 LT |
767 | break; |
768 | } | |
1da177e4 LT |
769 | return 0; |
770 | } | |
771 | ||
772 | /* | |
773 | * In the Linux kernel, we support selection of FPR format on the | |
70342287 | 774 | * basis of the Status.FR bit. If an FPU is not present, the FR bit |
da0bac33 | 775 | * is hardwired to zero, which would imply a 32-bit FPU even for |
597ce172 | 776 | * 64-bit CPUs so we rather look at TIF_32BIT_FPREGS. |
51d943f0 RB |
777 | * FPU emu is slow and bulky and optimizing this function offers fairly |
778 | * sizeable benefits so we try to be clever and make this function return | |
779 | * a constant whenever possible, that is on 64-bit kernels without O32 | |
597ce172 | 780 | * compatibility enabled and on 32-bit without 64-bit FPU support. |
1da177e4 | 781 | */ |
da0bac33 DD |
782 | static inline int cop1_64bit(struct pt_regs *xcp) |
783 | { | |
97f2645f | 784 | if (IS_ENABLED(CONFIG_64BIT) && !IS_ENABLED(CONFIG_MIPS32_O32)) |
08a07904 | 785 | return 1; |
97f2645f MY |
786 | else if (IS_ENABLED(CONFIG_32BIT) && |
787 | !IS_ENABLED(CONFIG_MIPS_O32_FP64_SUPPORT)) | |
08a07904 RB |
788 | return 0; |
789 | ||
597ce172 | 790 | return !test_thread_flag(TIF_32BIT_FPREGS); |
da0bac33 DD |
791 | } |
792 | ||
4227a2d4 PB |
793 | static inline bool hybrid_fprs(void) |
794 | { | |
795 | return test_thread_flag(TIF_HYBRID_FPREGS); | |
796 | } | |
797 | ||
47fa0c02 RB |
798 | #define SIFROMREG(si, x) \ |
799 | do { \ | |
4227a2d4 | 800 | if (cop1_64bit(xcp) && !hybrid_fprs()) \ |
c8c0da6b | 801 | (si) = (int)get_fpr32(&ctx->fpr[x], 0); \ |
bbd426f5 | 802 | else \ |
c8c0da6b | 803 | (si) = (int)get_fpr32(&ctx->fpr[(x) & ~1], (x) & 1); \ |
bbd426f5 | 804 | } while (0) |
1da177e4 | 805 | |
47fa0c02 RB |
806 | #define SITOREG(si, x) \ |
807 | do { \ | |
4227a2d4 | 808 | if (cop1_64bit(xcp) && !hybrid_fprs()) { \ |
a58f85b5 | 809 | unsigned int i; \ |
bbd426f5 | 810 | set_fpr32(&ctx->fpr[x], 0, si); \ |
ef1c47af PB |
811 | for (i = 1; i < ARRAY_SIZE(ctx->fpr[x].val32); i++) \ |
812 | set_fpr32(&ctx->fpr[x], i, 0); \ | |
813 | } else { \ | |
bbd426f5 | 814 | set_fpr32(&ctx->fpr[(x) & ~1], (x) & 1, si); \ |
ef1c47af | 815 | } \ |
bbd426f5 | 816 | } while (0) |
1da177e4 | 817 | |
c8c0da6b | 818 | #define SIFROMHREG(si, x) ((si) = (int)get_fpr32(&ctx->fpr[x], 1)) |
ef1c47af | 819 | |
47fa0c02 RB |
820 | #define SITOHREG(si, x) \ |
821 | do { \ | |
a58f85b5 | 822 | unsigned int i; \ |
ef1c47af PB |
823 | set_fpr32(&ctx->fpr[x], 1, si); \ |
824 | for (i = 2; i < ARRAY_SIZE(ctx->fpr[x].val32); i++) \ | |
825 | set_fpr32(&ctx->fpr[x], i, 0); \ | |
826 | } while (0) | |
1ac94400 | 827 | |
47fa0c02 | 828 | #define DIFROMREG(di, x) \ |
8535f2ba | 829 | ((di) = get_fpr64(&ctx->fpr[(x) & ~(cop1_64bit(xcp) ^ 1)], 0)) |
bbd426f5 | 830 | |
47fa0c02 RB |
831 | #define DITOREG(di, x) \ |
832 | do { \ | |
a58f85b5 | 833 | unsigned int fpr, i; \ |
8535f2ba | 834 | fpr = (x) & ~(cop1_64bit(xcp) ^ 1); \ |
ef1c47af PB |
835 | set_fpr64(&ctx->fpr[fpr], 0, di); \ |
836 | for (i = 1; i < ARRAY_SIZE(ctx->fpr[x].val64); i++) \ | |
837 | set_fpr64(&ctx->fpr[fpr], i, 0); \ | |
838 | } while (0) | |
1da177e4 | 839 | |
21a151d8 RB |
840 | #define SPFROMREG(sp, x) SIFROMREG((sp).bits, x) |
841 | #define SPTOREG(sp, x) SITOREG((sp).bits, x) | |
842 | #define DPFROMREG(dp, x) DIFROMREG((dp).bits, x) | |
843 | #define DPTOREG(dp, x) DITOREG((dp).bits, x) | |
1da177e4 | 844 | |
d4f5b088 MR |
845 | /* |
846 | * Emulate a CFC1 instruction. | |
847 | */ | |
848 | static inline void cop1_cfc(struct pt_regs *xcp, struct mips_fpu_struct *ctx, | |
849 | mips_instruction ir) | |
850 | { | |
c491cfa2 MR |
851 | u32 fcr31 = ctx->fcr31; |
852 | u32 value = 0; | |
d4f5b088 | 853 | |
c491cfa2 MR |
854 | switch (MIPSInst_RD(ir)) { |
855 | case FPCREG_CSR: | |
856 | value = fcr31; | |
d4f5b088 | 857 | pr_debug("%p gpr[%d]<-csr=%08x\n", |
c491cfa2 MR |
858 | (void *)xcp->cp0_epc, MIPSInst_RT(ir), value); |
859 | break; | |
860 | ||
861 | case FPCREG_FENR: | |
862 | if (!cpu_has_mips_r) | |
863 | break; | |
864 | value = (fcr31 >> (FPU_CSR_FS_S - MIPS_FENR_FS_S)) & | |
865 | MIPS_FENR_FS; | |
866 | value |= fcr31 & (FPU_CSR_ALL_E | FPU_CSR_RM); | |
867 | pr_debug("%p gpr[%d]<-enr=%08x\n", | |
868 | (void *)xcp->cp0_epc, MIPSInst_RT(ir), value); | |
869 | break; | |
870 | ||
871 | case FPCREG_FEXR: | |
872 | if (!cpu_has_mips_r) | |
873 | break; | |
874 | value = fcr31 & (FPU_CSR_ALL_X | FPU_CSR_ALL_S); | |
875 | pr_debug("%p gpr[%d]<-exr=%08x\n", | |
876 | (void *)xcp->cp0_epc, MIPSInst_RT(ir), value); | |
877 | break; | |
878 | ||
879 | case FPCREG_FCCR: | |
880 | if (!cpu_has_mips_r) | |
881 | break; | |
882 | value = (fcr31 >> (FPU_CSR_COND_S - MIPS_FCCR_COND0_S)) & | |
883 | MIPS_FCCR_COND0; | |
884 | value |= (fcr31 >> (FPU_CSR_COND1_S - MIPS_FCCR_COND1_S)) & | |
885 | (MIPS_FCCR_CONDX & ~MIPS_FCCR_COND0); | |
886 | pr_debug("%p gpr[%d]<-ccr=%08x\n", | |
887 | (void *)xcp->cp0_epc, MIPSInst_RT(ir), value); | |
888 | break; | |
889 | ||
890 | case FPCREG_RID: | |
03dce595 | 891 | value = boot_cpu_data.fpu_id; |
c491cfa2 MR |
892 | break; |
893 | ||
894 | default: | |
895 | break; | |
896 | } | |
897 | ||
d4f5b088 MR |
898 | if (MIPSInst_RT(ir)) |
899 | xcp->regs[MIPSInst_RT(ir)] = value; | |
900 | } | |
901 | ||
902 | /* | |
903 | * Emulate a CTC1 instruction. | |
904 | */ | |
905 | static inline void cop1_ctc(struct pt_regs *xcp, struct mips_fpu_struct *ctx, | |
906 | mips_instruction ir) | |
907 | { | |
c491cfa2 | 908 | u32 fcr31 = ctx->fcr31; |
d4f5b088 | 909 | u32 value; |
9b26616c | 910 | u32 mask; |
d4f5b088 MR |
911 | |
912 | if (MIPSInst_RT(ir) == 0) | |
913 | value = 0; | |
914 | else | |
915 | value = xcp->regs[MIPSInst_RT(ir)]; | |
916 | ||
c491cfa2 MR |
917 | switch (MIPSInst_RD(ir)) { |
918 | case FPCREG_CSR: | |
d4f5b088 | 919 | pr_debug("%p gpr[%d]->csr=%08x\n", |
c491cfa2 | 920 | (void *)xcp->cp0_epc, MIPSInst_RT(ir), value); |
d4f5b088 | 921 | |
9b26616c | 922 | /* Preserve read-only bits. */ |
03dce595 | 923 | mask = boot_cpu_data.fpu_msk31; |
9b26616c | 924 | fcr31 = (value & ~mask) | (fcr31 & mask); |
c491cfa2 MR |
925 | break; |
926 | ||
927 | case FPCREG_FENR: | |
928 | if (!cpu_has_mips_r) | |
929 | break; | |
930 | pr_debug("%p gpr[%d]->enr=%08x\n", | |
931 | (void *)xcp->cp0_epc, MIPSInst_RT(ir), value); | |
932 | fcr31 &= ~(FPU_CSR_FS | FPU_CSR_ALL_E | FPU_CSR_RM); | |
933 | fcr31 |= (value << (FPU_CSR_FS_S - MIPS_FENR_FS_S)) & | |
934 | FPU_CSR_FS; | |
935 | fcr31 |= value & (FPU_CSR_ALL_E | FPU_CSR_RM); | |
936 | break; | |
937 | ||
938 | case FPCREG_FEXR: | |
939 | if (!cpu_has_mips_r) | |
940 | break; | |
941 | pr_debug("%p gpr[%d]->exr=%08x\n", | |
942 | (void *)xcp->cp0_epc, MIPSInst_RT(ir), value); | |
943 | fcr31 &= ~(FPU_CSR_ALL_X | FPU_CSR_ALL_S); | |
944 | fcr31 |= value & (FPU_CSR_ALL_X | FPU_CSR_ALL_S); | |
945 | break; | |
946 | ||
947 | case FPCREG_FCCR: | |
948 | if (!cpu_has_mips_r) | |
949 | break; | |
950 | pr_debug("%p gpr[%d]->ccr=%08x\n", | |
951 | (void *)xcp->cp0_epc, MIPSInst_RT(ir), value); | |
952 | fcr31 &= ~(FPU_CSR_CONDX | FPU_CSR_COND); | |
953 | fcr31 |= (value << (FPU_CSR_COND_S - MIPS_FCCR_COND0_S)) & | |
954 | FPU_CSR_COND; | |
955 | fcr31 |= (value << (FPU_CSR_COND1_S - MIPS_FCCR_COND1_S)) & | |
956 | FPU_CSR_CONDX; | |
957 | break; | |
958 | ||
959 | default: | |
960 | break; | |
d4f5b088 | 961 | } |
c491cfa2 MR |
962 | |
963 | ctx->fcr31 = fcr31; | |
d4f5b088 MR |
964 | } |
965 | ||
1da177e4 LT |
966 | /* |
967 | * Emulate the single floating point instruction pointed at by EPC. | |
968 | * Two instructions if the instruction is in a branch delay slot. | |
969 | */ | |
970 | ||
515b029d | 971 | static int cop1Emulate(struct pt_regs *xcp, struct mips_fpu_struct *ctx, |
445a58ce | 972 | struct mm_decoded_insn dec_insn, void __user **fault_addr) |
1da177e4 | 973 | { |
102cedc3 | 974 | unsigned long contpc = xcp->cp0_epc + dec_insn.pc_inc; |
93583e17 | 975 | unsigned int cond, cbit, bit0; |
3f7cac41 RB |
976 | mips_instruction ir; |
977 | int likely, pc_inc; | |
93583e17 | 978 | union fpureg *fpr; |
3f7cac41 RB |
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 | |
96d4f267 | 1054 | if (!access_ok(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 | 1071 | DIFROMREG(dval, MIPSInst_RT(ir)); |
96d4f267 | 1072 | if (!access_ok(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); |
96d4f267 | 1088 | if (!access_ok(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 | 1105 | SIFROMREG(wval, MIPSInst_RT(ir)); |
96d4f267 | 1106 | if (!access_ok(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) |
70f743d1 | 1141 | return SIGILL; |
1ac94400 LY |
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) |
70f743d1 | 1152 | return SIGILL; |
1ac94400 LY |
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 | ||
61100500 AM |
1189 | likely = 0; |
1190 | cond = 0; | |
93583e17 PB |
1191 | fpr = ¤t->thread.fpu.fpr[MIPSInst_RT(ir)]; |
1192 | bit0 = get_fpr32(fpr, 0) & 0x1; | |
c909ca71 MC |
1193 | switch (MIPSInst_RS(ir)) { |
1194 | case bc1eqz_op: | |
454854ac | 1195 | MIPS_FPU_EMU_INC_STATS(bc1eqz); |
93583e17 | 1196 | cond = bit0 == 0; |
c909ca71 MC |
1197 | break; |
1198 | case bc1nez_op: | |
454854ac | 1199 | MIPS_FPU_EMU_INC_STATS(bc1nez); |
93583e17 | 1200 | cond = bit0 != 0; |
c909ca71 MC |
1201 | break; |
1202 | } | |
1203 | goto branch_common; | |
1204 | ||
3f7cac41 | 1205 | case bc_op: |
e7e9cae5 | 1206 | if (delay_slot(xcp)) |
1da177e4 LT |
1207 | return SIGILL; |
1208 | ||
08a07904 RB |
1209 | if (cpu_has_mips_4_5_r) |
1210 | cbit = fpucondbit[MIPSInst_RT(ir) >> 2]; | |
1211 | else | |
1212 | cbit = FPU_CSR_COND; | |
1213 | cond = ctx->fcr31 & cbit; | |
1214 | ||
3f7cac41 | 1215 | likely = 0; |
1da177e4 LT |
1216 | switch (MIPSInst_RT(ir) & 3) { |
1217 | case bcfl_op: | |
2d83fea7 MR |
1218 | if (cpu_has_mips_2_3_4_5_r) |
1219 | likely = 1; | |
2a14b21a | 1220 | /* fall through */ |
1da177e4 LT |
1221 | case bcf_op: |
1222 | cond = !cond; | |
1223 | break; | |
1224 | case bctl_op: | |
2d83fea7 MR |
1225 | if (cpu_has_mips_2_3_4_5_r) |
1226 | likely = 1; | |
2a14b21a | 1227 | /* fall through */ |
1da177e4 LT |
1228 | case bct_op: |
1229 | break; | |
1da177e4 | 1230 | } |
c909ca71 | 1231 | branch_common: |
ae5f3f5b | 1232 | MIPS_FPU_EMU_INC_STATS(branches); |
e7e9cae5 | 1233 | set_delay_slot(xcp); |
1da177e4 | 1234 | if (cond) { |
3f7cac41 RB |
1235 | /* |
1236 | * Branch taken: emulate dslot instruction | |
1da177e4 | 1237 | */ |
9ab4471c MR |
1238 | unsigned long bcpc; |
1239 | ||
1240 | /* | |
1241 | * Remember EPC at the branch to point back | |
1242 | * at so that any delay-slot instruction | |
1243 | * signal is not silently ignored. | |
1244 | */ | |
1245 | bcpc = xcp->cp0_epc; | |
102cedc3 LY |
1246 | xcp->cp0_epc += dec_insn.pc_inc; |
1247 | ||
1248 | contpc = MIPSInst_SIMM(ir); | |
1249 | ir = dec_insn.next_insn; | |
1250 | if (dec_insn.micro_mips_mode) { | |
1251 | contpc = (xcp->cp0_epc + (contpc << 1)); | |
1252 | ||
1253 | /* If 16-bit instruction, not FPU. */ | |
1254 | if ((dec_insn.next_pc_inc == 2) || | |
1255 | (microMIPS32_to_MIPS32((union mips_instruction *)&ir) == SIGILL)) { | |
1256 | ||
1257 | /* | |
1258 | * Since this instruction will | |
1259 | * be put on the stack with | |
1260 | * 32-bit words, get around | |
1261 | * this problem by putting a | |
1262 | * NOP16 as the second one. | |
1263 | */ | |
1264 | if (dec_insn.next_pc_inc == 2) | |
1265 | ir = (ir & (~0xffff)) | MM_NOP16; | |
1266 | ||
1267 | /* | |
1268 | * Single step the non-CP1 | |
1269 | * instruction in the dslot. | |
1270 | */ | |
9ab4471c | 1271 | sig = mips_dsemul(xcp, ir, |
432c6bac | 1272 | bcpc, contpc); |
e4553573 MR |
1273 | if (sig < 0) |
1274 | break; | |
9ab4471c MR |
1275 | if (sig) |
1276 | xcp->cp0_epc = bcpc; | |
1277 | /* | |
1278 | * SIGILL forces out of | |
1279 | * the emulation loop. | |
1280 | */ | |
1281 | return sig ? sig : SIGILL; | |
102cedc3 LY |
1282 | } |
1283 | } else | |
1284 | contpc = (xcp->cp0_epc + (contpc << 2)); | |
1da177e4 LT |
1285 | |
1286 | switch (MIPSInst_OPCODE(ir)) { | |
1287 | case lwc1_op: | |
1288 | case swc1_op: | |
08a07904 | 1289 | goto emul; |
3f7cac41 | 1290 | |
1da177e4 LT |
1291 | case ldc1_op: |
1292 | case sdc1_op: | |
2d83fea7 | 1293 | if (cpu_has_mips_2_3_4_5_r) |
08a07904 RB |
1294 | goto emul; |
1295 | ||
9ab4471c | 1296 | goto bc_sigill; |
3f7cac41 | 1297 | |
1da177e4 | 1298 | case cop1_op: |
1da177e4 | 1299 | goto emul; |
3f7cac41 | 1300 | |
08a07904 | 1301 | case cop1x_op: |
2d83fea7 | 1302 | if (cpu_has_mips_4_5_64_r2_r6) |
08a07904 RB |
1303 | /* its one of ours */ |
1304 | goto emul; | |
1305 | ||
9ab4471c | 1306 | goto bc_sigill; |
3f7cac41 | 1307 | |
1da177e4 | 1308 | case spec_op: |
2d83fea7 MR |
1309 | switch (MIPSInst_FUNC(ir)) { |
1310 | case movc_op: | |
1311 | if (cpu_has_mips_4_5_r) | |
1312 | goto emul; | |
08a07904 | 1313 | |
9ab4471c | 1314 | goto bc_sigill; |
2d83fea7 | 1315 | } |
1da177e4 | 1316 | break; |
9ab4471c MR |
1317 | |
1318 | bc_sigill: | |
1319 | xcp->cp0_epc = bcpc; | |
1320 | return SIGILL; | |
1da177e4 LT |
1321 | } |
1322 | ||
1323 | /* | |
1324 | * Single step the non-cp1 | |
1325 | * instruction in the dslot | |
1326 | */ | |
432c6bac | 1327 | sig = mips_dsemul(xcp, ir, bcpc, contpc); |
e4553573 MR |
1328 | if (sig < 0) |
1329 | break; | |
9ab4471c MR |
1330 | if (sig) |
1331 | xcp->cp0_epc = bcpc; | |
1332 | /* SIGILL forces out of the emulation loop. */ | |
1333 | return sig ? sig : SIGILL; | |
3f7cac41 | 1334 | } else if (likely) { /* branch not taken */ |
5d77cf28 MR |
1335 | /* |
1336 | * branch likely nullifies | |
1337 | * dslot if not taken | |
1338 | */ | |
1339 | xcp->cp0_epc += dec_insn.pc_inc; | |
1340 | contpc += dec_insn.pc_inc; | |
1341 | /* | |
1342 | * else continue & execute | |
1343 | * dslot as normal insn | |
1344 | */ | |
1345 | } | |
1da177e4 | 1346 | break; |
1da177e4 LT |
1347 | |
1348 | default: | |
1349 | if (!(MIPSInst_RS(ir) & 0x10)) | |
1350 | return SIGILL; | |
1da177e4 | 1351 | |
3f7cac41 | 1352 | /* a real fpu computation instruction */ |
8904d5b1 AM |
1353 | sig = fpu_emu(xcp, ctx, ir); |
1354 | if (sig) | |
3f7cac41 | 1355 | return sig; |
1da177e4 LT |
1356 | } |
1357 | break; | |
1358 | ||
3f7cac41 | 1359 | case cop1x_op: |
2d83fea7 | 1360 | if (!cpu_has_mips_4_5_64_r2_r6) |
08a07904 RB |
1361 | return SIGILL; |
1362 | ||
1363 | sig = fpux_emu(xcp, ctx, ir, fault_addr); | |
515b029d | 1364 | if (sig) |
1da177e4 LT |
1365 | return sig; |
1366 | break; | |
1da177e4 | 1367 | |
1da177e4 | 1368 | case spec_op: |
08a07904 RB |
1369 | if (!cpu_has_mips_4_5_r) |
1370 | return SIGILL; | |
1371 | ||
1da177e4 LT |
1372 | if (MIPSInst_FUNC(ir) != movc_op) |
1373 | return SIGILL; | |
1374 | cond = fpucondbit[MIPSInst_RT(ir) >> 2]; | |
1375 | if (((ctx->fcr31 & cond) != 0) == ((MIPSInst_RT(ir) & 1) != 0)) | |
1376 | xcp->regs[MIPSInst_RD(ir)] = | |
1377 | xcp->regs[MIPSInst_RS(ir)]; | |
1378 | break; | |
1da177e4 LT |
1379 | default: |
1380 | return SIGILL; | |
1381 | } | |
1382 | ||
1383 | /* we did it !! */ | |
e70dfc10 | 1384 | xcp->cp0_epc = contpc; |
e7e9cae5 | 1385 | clear_delay_slot(xcp); |
333d1f67 | 1386 | |
1da177e4 LT |
1387 | return 0; |
1388 | } | |
1389 | ||
1390 | /* | |
1391 | * Conversion table from MIPS compare ops 48-63 | |
1392 | * cond = ieee754dp_cmp(x,y,IEEE754_UN,sig); | |
1393 | */ | |
1394 | static const unsigned char cmptab[8] = { | |
1395 | 0, /* cmp_0 (sig) cmp_sf */ | |
1396 | IEEE754_CUN, /* cmp_un (sig) cmp_ngle */ | |
1397 | IEEE754_CEQ, /* cmp_eq (sig) cmp_seq */ | |
1398 | IEEE754_CEQ | IEEE754_CUN, /* cmp_ueq (sig) cmp_ngl */ | |
1399 | IEEE754_CLT, /* cmp_olt (sig) cmp_lt */ | |
1400 | IEEE754_CLT | IEEE754_CUN, /* cmp_ult (sig) cmp_nge */ | |
1401 | IEEE754_CLT | IEEE754_CEQ, /* cmp_ole (sig) cmp_le */ | |
1402 | IEEE754_CLT | IEEE754_CEQ | IEEE754_CUN, /* cmp_ule (sig) cmp_ngt */ | |
1403 | }; | |
1404 | ||
f8c3c671 MC |
1405 | static const unsigned char negative_cmptab[8] = { |
1406 | 0, /* Reserved */ | |
1407 | IEEE754_CLT | IEEE754_CGT | IEEE754_CEQ, | |
1408 | IEEE754_CLT | IEEE754_CGT | IEEE754_CUN, | |
1409 | IEEE754_CLT | IEEE754_CGT, | |
1410 | /* Reserved */ | |
1411 | }; | |
1412 | ||
1da177e4 | 1413 | |
1da177e4 LT |
1414 | /* |
1415 | * Additional MIPS4 instructions | |
1416 | */ | |
1417 | ||
47fa0c02 RB |
1418 | #define DEF3OP(name, p, f1, f2, f3) \ |
1419 | static union ieee754##p fpemu_##p##_##name(union ieee754##p r, \ | |
1420 | union ieee754##p s, union ieee754##p t) \ | |
1421 | { \ | |
1422 | struct _ieee754_csr ieee754_csr_save; \ | |
1423 | s = f1(s, t); \ | |
1424 | ieee754_csr_save = ieee754_csr; \ | |
1425 | s = f2(s, r); \ | |
1426 | ieee754_csr_save.cx |= ieee754_csr.cx; \ | |
1427 | ieee754_csr_save.sx |= ieee754_csr.sx; \ | |
1428 | s = f3(s); \ | |
1429 | ieee754_csr.cx |= ieee754_csr_save.cx; \ | |
1430 | ieee754_csr.sx |= ieee754_csr_save.sx; \ | |
1431 | return s; \ | |
1da177e4 LT |
1432 | } |
1433 | ||
2209bcb1 | 1434 | static union ieee754dp fpemu_dp_recip(union ieee754dp d) |
1da177e4 LT |
1435 | { |
1436 | return ieee754dp_div(ieee754dp_one(0), d); | |
1437 | } | |
1438 | ||
2209bcb1 | 1439 | static union ieee754dp fpemu_dp_rsqrt(union ieee754dp d) |
1da177e4 LT |
1440 | { |
1441 | return ieee754dp_div(ieee754dp_one(0), ieee754dp_sqrt(d)); | |
1442 | } | |
1443 | ||
2209bcb1 | 1444 | static union ieee754sp fpemu_sp_recip(union ieee754sp s) |
1da177e4 LT |
1445 | { |
1446 | return ieee754sp_div(ieee754sp_one(0), s); | |
1447 | } | |
1448 | ||
2209bcb1 | 1449 | static union ieee754sp fpemu_sp_rsqrt(union ieee754sp s) |
1da177e4 LT |
1450 | { |
1451 | return ieee754sp_div(ieee754sp_one(0), ieee754sp_sqrt(s)); | |
1452 | } | |
1453 | ||
21a151d8 RB |
1454 | DEF3OP(madd, sp, ieee754sp_mul, ieee754sp_add, ); |
1455 | DEF3OP(msub, sp, ieee754sp_mul, ieee754sp_sub, ); | |
1da177e4 LT |
1456 | DEF3OP(nmadd, sp, ieee754sp_mul, ieee754sp_add, ieee754sp_neg); |
1457 | DEF3OP(nmsub, sp, ieee754sp_mul, ieee754sp_sub, ieee754sp_neg); | |
21a151d8 RB |
1458 | DEF3OP(madd, dp, ieee754dp_mul, ieee754dp_add, ); |
1459 | DEF3OP(msub, dp, ieee754dp_mul, ieee754dp_sub, ); | |
1da177e4 LT |
1460 | DEF3OP(nmadd, dp, ieee754dp_mul, ieee754dp_add, ieee754dp_neg); |
1461 | DEF3OP(nmsub, dp, ieee754dp_mul, ieee754dp_sub, ieee754dp_neg); | |
1462 | ||
eae89076 | 1463 | static int fpux_emu(struct pt_regs *xcp, struct mips_fpu_struct *ctx, |
445a58ce | 1464 | mips_instruction ir, void __user **fault_addr) |
1da177e4 | 1465 | { |
a58f85b5 | 1466 | unsigned int rcsr = 0; /* resulting csr */ |
1da177e4 | 1467 | |
b6ee75ed | 1468 | MIPS_FPU_EMU_INC_STATS(cp1xops); |
1da177e4 LT |
1469 | |
1470 | switch (MIPSInst_FMA_FFMT(ir)) { | |
1471 | case s_fmt:{ /* 0 */ | |
1472 | ||
2209bcb1 RB |
1473 | union ieee754sp(*handler) (union ieee754sp, union ieee754sp, union ieee754sp); |
1474 | union ieee754sp fd, fr, fs, ft; | |
3fccc015 | 1475 | u32 __user *va; |
1da177e4 LT |
1476 | u32 val; |
1477 | ||
1478 | switch (MIPSInst_FUNC(ir)) { | |
1479 | case lwxc1_op: | |
3fccc015 | 1480 | va = (void __user *) (xcp->regs[MIPSInst_FR(ir)] + |
1da177e4 LT |
1481 | xcp->regs[MIPSInst_FT(ir)]); |
1482 | ||
b6ee75ed | 1483 | MIPS_FPU_EMU_INC_STATS(loads); |
96d4f267 | 1484 | if (!access_ok(va, sizeof(u32))) { |
b6ee75ed | 1485 | MIPS_FPU_EMU_INC_STATS(errors); |
515b029d | 1486 | *fault_addr = va; |
1da177e4 LT |
1487 | return SIGBUS; |
1488 | } | |
515b029d DD |
1489 | if (__get_user(val, va)) { |
1490 | MIPS_FPU_EMU_INC_STATS(errors); | |
1491 | *fault_addr = va; | |
1492 | return SIGSEGV; | |
1493 | } | |
1da177e4 LT |
1494 | SITOREG(val, MIPSInst_FD(ir)); |
1495 | break; | |
1496 | ||
1497 | case swxc1_op: | |
3fccc015 | 1498 | va = (void __user *) (xcp->regs[MIPSInst_FR(ir)] + |
1da177e4 LT |
1499 | xcp->regs[MIPSInst_FT(ir)]); |
1500 | ||
b6ee75ed | 1501 | MIPS_FPU_EMU_INC_STATS(stores); |
1da177e4 LT |
1502 | |
1503 | SIFROMREG(val, MIPSInst_FS(ir)); | |
96d4f267 | 1504 | if (!access_ok(va, sizeof(u32))) { |
b6ee75ed | 1505 | MIPS_FPU_EMU_INC_STATS(errors); |
515b029d | 1506 | *fault_addr = va; |
1da177e4 LT |
1507 | return SIGBUS; |
1508 | } | |
515b029d DD |
1509 | if (put_user(val, va)) { |
1510 | MIPS_FPU_EMU_INC_STATS(errors); | |
1511 | *fault_addr = va; | |
1512 | return SIGSEGV; | |
1513 | } | |
1da177e4 LT |
1514 | break; |
1515 | ||
1516 | case madd_s_op: | |
1517 | handler = fpemu_sp_madd; | |
1518 | goto scoptop; | |
1519 | case msub_s_op: | |
1520 | handler = fpemu_sp_msub; | |
1521 | goto scoptop; | |
1522 | case nmadd_s_op: | |
1523 | handler = fpemu_sp_nmadd; | |
1524 | goto scoptop; | |
1525 | case nmsub_s_op: | |
1526 | handler = fpemu_sp_nmsub; | |
1527 | goto scoptop; | |
1528 | ||
1529 | scoptop: | |
1530 | SPFROMREG(fr, MIPSInst_FR(ir)); | |
1531 | SPFROMREG(fs, MIPSInst_FS(ir)); | |
1532 | SPFROMREG(ft, MIPSInst_FT(ir)); | |
1533 | fd = (*handler) (fr, fs, ft); | |
1534 | SPTOREG(fd, MIPSInst_FD(ir)); | |
1535 | ||
1536 | copcsr: | |
c4103526 DCZ |
1537 | if (ieee754_cxtest(IEEE754_INEXACT)) { |
1538 | MIPS_FPU_EMU_INC_STATS(ieee754_inexact); | |
1da177e4 | 1539 | rcsr |= FPU_CSR_INE_X | FPU_CSR_INE_S; |
c4103526 DCZ |
1540 | } |
1541 | if (ieee754_cxtest(IEEE754_UNDERFLOW)) { | |
1542 | MIPS_FPU_EMU_INC_STATS(ieee754_underflow); | |
1da177e4 | 1543 | rcsr |= FPU_CSR_UDF_X | FPU_CSR_UDF_S; |
c4103526 DCZ |
1544 | } |
1545 | if (ieee754_cxtest(IEEE754_OVERFLOW)) { | |
1546 | MIPS_FPU_EMU_INC_STATS(ieee754_overflow); | |
1da177e4 | 1547 | rcsr |= FPU_CSR_OVF_X | FPU_CSR_OVF_S; |
c4103526 DCZ |
1548 | } |
1549 | if (ieee754_cxtest(IEEE754_INVALID_OPERATION)) { | |
1550 | MIPS_FPU_EMU_INC_STATS(ieee754_invalidop); | |
1da177e4 | 1551 | rcsr |= FPU_CSR_INV_X | FPU_CSR_INV_S; |
c4103526 | 1552 | } |
1da177e4 LT |
1553 | |
1554 | ctx->fcr31 = (ctx->fcr31 & ~FPU_CSR_ALL_X) | rcsr; | |
1da177e4 | 1555 | if ((ctx->fcr31 >> 5) & ctx->fcr31 & FPU_CSR_ALL_E) { |
3f7cac41 | 1556 | /*printk ("SIGFPE: FPU csr = %08x\n", |
1da177e4 LT |
1557 | ctx->fcr31); */ |
1558 | return SIGFPE; | |
1559 | } | |
1560 | ||
1561 | break; | |
1562 | ||
1563 | default: | |
1564 | return SIGILL; | |
1565 | } | |
1566 | break; | |
1567 | } | |
1568 | ||
1da177e4 | 1569 | case d_fmt:{ /* 1 */ |
2209bcb1 RB |
1570 | union ieee754dp(*handler) (union ieee754dp, union ieee754dp, union ieee754dp); |
1571 | union ieee754dp fd, fr, fs, ft; | |
3fccc015 | 1572 | u64 __user *va; |
1da177e4 LT |
1573 | u64 val; |
1574 | ||
1575 | switch (MIPSInst_FUNC(ir)) { | |
1576 | case ldxc1_op: | |
3fccc015 | 1577 | va = (void __user *) (xcp->regs[MIPSInst_FR(ir)] + |
1da177e4 LT |
1578 | xcp->regs[MIPSInst_FT(ir)]); |
1579 | ||
b6ee75ed | 1580 | MIPS_FPU_EMU_INC_STATS(loads); |
96d4f267 | 1581 | if (!access_ok(va, sizeof(u64))) { |
b6ee75ed | 1582 | MIPS_FPU_EMU_INC_STATS(errors); |
515b029d | 1583 | *fault_addr = va; |
1da177e4 LT |
1584 | return SIGBUS; |
1585 | } | |
515b029d DD |
1586 | if (__get_user(val, va)) { |
1587 | MIPS_FPU_EMU_INC_STATS(errors); | |
1588 | *fault_addr = va; | |
1589 | return SIGSEGV; | |
1590 | } | |
1da177e4 LT |
1591 | DITOREG(val, MIPSInst_FD(ir)); |
1592 | break; | |
1593 | ||
1594 | case sdxc1_op: | |
3fccc015 | 1595 | va = (void __user *) (xcp->regs[MIPSInst_FR(ir)] + |
1da177e4 LT |
1596 | xcp->regs[MIPSInst_FT(ir)]); |
1597 | ||
b6ee75ed | 1598 | MIPS_FPU_EMU_INC_STATS(stores); |
1da177e4 | 1599 | DIFROMREG(val, MIPSInst_FS(ir)); |
96d4f267 | 1600 | if (!access_ok(va, sizeof(u64))) { |
b6ee75ed | 1601 | MIPS_FPU_EMU_INC_STATS(errors); |
515b029d | 1602 | *fault_addr = va; |
1da177e4 LT |
1603 | return SIGBUS; |
1604 | } | |
515b029d DD |
1605 | if (__put_user(val, va)) { |
1606 | MIPS_FPU_EMU_INC_STATS(errors); | |
1607 | *fault_addr = va; | |
1608 | return SIGSEGV; | |
1609 | } | |
1da177e4 LT |
1610 | break; |
1611 | ||
1612 | case madd_d_op: | |
1613 | handler = fpemu_dp_madd; | |
1614 | goto dcoptop; | |
1615 | case msub_d_op: | |
1616 | handler = fpemu_dp_msub; | |
1617 | goto dcoptop; | |
1618 | case nmadd_d_op: | |
1619 | handler = fpemu_dp_nmadd; | |
1620 | goto dcoptop; | |
1621 | case nmsub_d_op: | |
1622 | handler = fpemu_dp_nmsub; | |
1623 | goto dcoptop; | |
1624 | ||
1625 | dcoptop: | |
1626 | DPFROMREG(fr, MIPSInst_FR(ir)); | |
1627 | DPFROMREG(fs, MIPSInst_FS(ir)); | |
1628 | DPFROMREG(ft, MIPSInst_FT(ir)); | |
1629 | fd = (*handler) (fr, fs, ft); | |
1630 | DPTOREG(fd, MIPSInst_FD(ir)); | |
1631 | goto copcsr; | |
1632 | ||
1633 | default: | |
1634 | return SIGILL; | |
1635 | } | |
1636 | break; | |
1637 | } | |
1da177e4 | 1638 | |
51061b88 DCZ |
1639 | case 0x3: |
1640 | if (MIPSInst_FUNC(ir) != pfetch_op) | |
1da177e4 | 1641 | return SIGILL; |
51061b88 | 1642 | |
1da177e4 LT |
1643 | /* ignore prefx operation */ |
1644 | break; | |
1645 | ||
1646 | default: | |
1647 | return SIGILL; | |
1648 | } | |
1649 | ||
1650 | return 0; | |
1651 | } | |
1da177e4 LT |
1652 | |
1653 | ||
1654 | ||
1655 | /* | |
1656 | * Emulate a single COP1 arithmetic instruction. | |
1657 | */ | |
eae89076 | 1658 | static int fpu_emu(struct pt_regs *xcp, struct mips_fpu_struct *ctx, |
1da177e4 LT |
1659 | mips_instruction ir) |
1660 | { | |
1661 | int rfmt; /* resulting format */ | |
a58f85b5 | 1662 | unsigned int rcsr = 0; /* resulting csr */ |
3f7cac41 RB |
1663 | unsigned int oldrm; |
1664 | unsigned int cbit; | |
a58f85b5 | 1665 | unsigned int cond; |
1da177e4 | 1666 | union { |
2209bcb1 RB |
1667 | union ieee754dp d; |
1668 | union ieee754sp s; | |
1da177e4 | 1669 | int w; |
1da177e4 | 1670 | s64 l; |
1da177e4 | 1671 | } rv; /* resulting value */ |
3f7cac41 | 1672 | u64 bits; |
1da177e4 | 1673 | |
b6ee75ed | 1674 | MIPS_FPU_EMU_INC_STATS(cp1ops); |
1da177e4 | 1675 | switch (rfmt = (MIPSInst_FFMT(ir) & 0xf)) { |
3f7cac41 | 1676 | case s_fmt: { /* 0 */ |
1da177e4 | 1677 | union { |
2209bcb1 RB |
1678 | union ieee754sp(*b) (union ieee754sp, union ieee754sp); |
1679 | union ieee754sp(*u) (union ieee754sp); | |
1da177e4 | 1680 | } handler; |
4b820d95 | 1681 | union ieee754sp fd, fs, ft; |
1da177e4 LT |
1682 | |
1683 | switch (MIPSInst_FUNC(ir)) { | |
1684 | /* binary ops */ | |
1685 | case fadd_op: | |
454854ac | 1686 | MIPS_FPU_EMU_INC_STATS(add_s); |
1da177e4 LT |
1687 | handler.b = ieee754sp_add; |
1688 | goto scopbop; | |
1689 | case fsub_op: | |
454854ac | 1690 | MIPS_FPU_EMU_INC_STATS(sub_s); |
1da177e4 LT |
1691 | handler.b = ieee754sp_sub; |
1692 | goto scopbop; | |
1693 | case fmul_op: | |
454854ac | 1694 | MIPS_FPU_EMU_INC_STATS(mul_s); |
1da177e4 LT |
1695 | handler.b = ieee754sp_mul; |
1696 | goto scopbop; | |
1697 | case fdiv_op: | |
454854ac | 1698 | MIPS_FPU_EMU_INC_STATS(div_s); |
1da177e4 LT |
1699 | handler.b = ieee754sp_div; |
1700 | goto scopbop; | |
1701 | ||
1702 | /* unary ops */ | |
1da177e4 | 1703 | case fsqrt_op: |
2d83fea7 | 1704 | if (!cpu_has_mips_2_3_4_5_r) |
08a07904 RB |
1705 | return SIGILL; |
1706 | ||
454854ac | 1707 | MIPS_FPU_EMU_INC_STATS(sqrt_s); |
1da177e4 LT |
1708 | handler.u = ieee754sp_sqrt; |
1709 | goto scopuop; | |
3f7cac41 | 1710 | |
08a07904 RB |
1711 | /* |
1712 | * Note that on some MIPS IV implementations such as the | |
1713 | * R5000 and R8000 the FSQRT and FRECIP instructions do not | |
1714 | * achieve full IEEE-754 accuracy - however this emulator does. | |
1715 | */ | |
1da177e4 | 1716 | case frsqrt_op: |
2d83fea7 | 1717 | if (!cpu_has_mips_4_5_64_r2_r6) |
08a07904 RB |
1718 | return SIGILL; |
1719 | ||
454854ac | 1720 | MIPS_FPU_EMU_INC_STATS(rsqrt_s); |
1da177e4 LT |
1721 | handler.u = fpemu_sp_rsqrt; |
1722 | goto scopuop; | |
3f7cac41 | 1723 | |
1da177e4 | 1724 | case frecip_op: |
2d83fea7 | 1725 | if (!cpu_has_mips_4_5_64_r2_r6) |
08a07904 RB |
1726 | return SIGILL; |
1727 | ||
454854ac | 1728 | MIPS_FPU_EMU_INC_STATS(recip_s); |
1da177e4 LT |
1729 | handler.u = fpemu_sp_recip; |
1730 | goto scopuop; | |
08a07904 | 1731 | |
1da177e4 | 1732 | case fmovc_op: |
08a07904 RB |
1733 | if (!cpu_has_mips_4_5_r) |
1734 | return SIGILL; | |
1735 | ||
1da177e4 LT |
1736 | cond = fpucondbit[MIPSInst_FT(ir) >> 2]; |
1737 | if (((ctx->fcr31 & cond) != 0) != | |
1738 | ((MIPSInst_FT(ir) & 1) != 0)) | |
1739 | return 0; | |
1740 | SPFROMREG(rv.s, MIPSInst_FS(ir)); | |
1741 | break; | |
3f7cac41 | 1742 | |
1da177e4 | 1743 | case fmovz_op: |
08a07904 RB |
1744 | if (!cpu_has_mips_4_5_r) |
1745 | return SIGILL; | |
1746 | ||
1da177e4 LT |
1747 | if (xcp->regs[MIPSInst_FT(ir)] != 0) |
1748 | return 0; | |
1749 | SPFROMREG(rv.s, MIPSInst_FS(ir)); | |
1750 | break; | |
3f7cac41 | 1751 | |
1da177e4 | 1752 | case fmovn_op: |
08a07904 RB |
1753 | if (!cpu_has_mips_4_5_r) |
1754 | return SIGILL; | |
1755 | ||
1da177e4 LT |
1756 | if (xcp->regs[MIPSInst_FT(ir)] == 0) |
1757 | return 0; | |
1758 | SPFROMREG(rv.s, MIPSInst_FS(ir)); | |
1759 | break; | |
3f7cac41 | 1760 | |
67613f02 MC |
1761 | case fseleqz_op: |
1762 | if (!cpu_has_mips_r6) | |
1763 | return SIGILL; | |
1764 | ||
454854ac | 1765 | MIPS_FPU_EMU_INC_STATS(seleqz_s); |
67613f02 MC |
1766 | SPFROMREG(rv.s, MIPSInst_FT(ir)); |
1767 | if (rv.w & 0x1) | |
1768 | rv.w = 0; | |
1769 | else | |
1770 | SPFROMREG(rv.s, MIPSInst_FS(ir)); | |
1771 | break; | |
1772 | ||
130fe357 MC |
1773 | case fselnez_op: |
1774 | if (!cpu_has_mips_r6) | |
1775 | return SIGILL; | |
1776 | ||
454854ac | 1777 | MIPS_FPU_EMU_INC_STATS(selnez_s); |
130fe357 MC |
1778 | SPFROMREG(rv.s, MIPSInst_FT(ir)); |
1779 | if (rv.w & 0x1) | |
1780 | SPFROMREG(rv.s, MIPSInst_FS(ir)); | |
1781 | else | |
1782 | rv.w = 0; | |
1783 | break; | |
1784 | ||
e24c3bec MC |
1785 | case fmaddf_op: { |
1786 | union ieee754sp ft, fs, fd; | |
1787 | ||
1788 | if (!cpu_has_mips_r6) | |
1789 | return SIGILL; | |
1790 | ||
454854ac | 1791 | MIPS_FPU_EMU_INC_STATS(maddf_s); |
e24c3bec MC |
1792 | SPFROMREG(ft, MIPSInst_FT(ir)); |
1793 | SPFROMREG(fs, MIPSInst_FS(ir)); | |
1794 | SPFROMREG(fd, MIPSInst_FD(ir)); | |
1795 | rv.s = ieee754sp_maddf(fd, fs, ft); | |
409fcace | 1796 | goto copcsr; |
e24c3bec MC |
1797 | } |
1798 | ||
83d43305 MC |
1799 | case fmsubf_op: { |
1800 | union ieee754sp ft, fs, fd; | |
1801 | ||
1802 | if (!cpu_has_mips_r6) | |
1803 | return SIGILL; | |
1804 | ||
454854ac | 1805 | MIPS_FPU_EMU_INC_STATS(msubf_s); |
83d43305 MC |
1806 | SPFROMREG(ft, MIPSInst_FT(ir)); |
1807 | SPFROMREG(fs, MIPSInst_FS(ir)); | |
1808 | SPFROMREG(fd, MIPSInst_FD(ir)); | |
1809 | rv.s = ieee754sp_msubf(fd, fs, ft); | |
409fcace | 1810 | goto copcsr; |
83d43305 MC |
1811 | } |
1812 | ||
400bd2e4 MC |
1813 | case frint_op: { |
1814 | union ieee754sp fs; | |
1815 | ||
1816 | if (!cpu_has_mips_r6) | |
1817 | return SIGILL; | |
1818 | ||
454854ac | 1819 | MIPS_FPU_EMU_INC_STATS(rint_s); |
400bd2e4 | 1820 | SPFROMREG(fs, MIPSInst_FS(ir)); |
3ec404d8 | 1821 | rv.s = ieee754sp_rint(fs); |
400bd2e4 MC |
1822 | goto copcsr; |
1823 | } | |
1824 | ||
38db37ba MC |
1825 | case fclass_op: { |
1826 | union ieee754sp fs; | |
1827 | ||
1828 | if (!cpu_has_mips_r6) | |
1829 | return SIGILL; | |
1830 | ||
454854ac | 1831 | MIPS_FPU_EMU_INC_STATS(class_s); |
38db37ba MC |
1832 | SPFROMREG(fs, MIPSInst_FS(ir)); |
1833 | rv.w = ieee754sp_2008class(fs); | |
1834 | rfmt = w_fmt; | |
409fcace | 1835 | goto copcsr; |
38db37ba MC |
1836 | } |
1837 | ||
4e9561b2 MC |
1838 | case fmin_op: { |
1839 | union ieee754sp fs, ft; | |
1840 | ||
1841 | if (!cpu_has_mips_r6) | |
1842 | return SIGILL; | |
1843 | ||
454854ac | 1844 | MIPS_FPU_EMU_INC_STATS(min_s); |
4e9561b2 MC |
1845 | SPFROMREG(ft, MIPSInst_FT(ir)); |
1846 | SPFROMREG(fs, MIPSInst_FS(ir)); | |
1847 | rv.s = ieee754sp_fmin(fs, ft); | |
409fcace | 1848 | goto copcsr; |
4e9561b2 MC |
1849 | } |
1850 | ||
1851 | case fmina_op: { | |
1852 | union ieee754sp fs, ft; | |
1853 | ||
1854 | if (!cpu_has_mips_r6) | |
1855 | return SIGILL; | |
1856 | ||
454854ac | 1857 | MIPS_FPU_EMU_INC_STATS(mina_s); |
4e9561b2 MC |
1858 | SPFROMREG(ft, MIPSInst_FT(ir)); |
1859 | SPFROMREG(fs, MIPSInst_FS(ir)); | |
1860 | rv.s = ieee754sp_fmina(fs, ft); | |
409fcace | 1861 | goto copcsr; |
4e9561b2 MC |
1862 | } |
1863 | ||
a79f5f9b MC |
1864 | case fmax_op: { |
1865 | union ieee754sp fs, ft; | |
1866 | ||
1867 | if (!cpu_has_mips_r6) | |
1868 | return SIGILL; | |
1869 | ||
454854ac | 1870 | MIPS_FPU_EMU_INC_STATS(max_s); |
a79f5f9b MC |
1871 | SPFROMREG(ft, MIPSInst_FT(ir)); |
1872 | SPFROMREG(fs, MIPSInst_FS(ir)); | |
1873 | rv.s = ieee754sp_fmax(fs, ft); | |
409fcace | 1874 | goto copcsr; |
a79f5f9b MC |
1875 | } |
1876 | ||
1877 | case fmaxa_op: { | |
1878 | union ieee754sp fs, ft; | |
1879 | ||
1880 | if (!cpu_has_mips_r6) | |
1881 | return SIGILL; | |
1882 | ||
454854ac | 1883 | MIPS_FPU_EMU_INC_STATS(maxa_s); |
a79f5f9b MC |
1884 | SPFROMREG(ft, MIPSInst_FT(ir)); |
1885 | SPFROMREG(fs, MIPSInst_FS(ir)); | |
1886 | rv.s = ieee754sp_fmaxa(fs, ft); | |
409fcace | 1887 | goto copcsr; |
a79f5f9b MC |
1888 | } |
1889 | ||
1da177e4 | 1890 | case fabs_op: |
454854ac | 1891 | MIPS_FPU_EMU_INC_STATS(abs_s); |
1da177e4 LT |
1892 | handler.u = ieee754sp_abs; |
1893 | goto scopuop; | |
3f7cac41 | 1894 | |
1da177e4 | 1895 | case fneg_op: |
454854ac | 1896 | MIPS_FPU_EMU_INC_STATS(neg_s); |
1da177e4 LT |
1897 | handler.u = ieee754sp_neg; |
1898 | goto scopuop; | |
3f7cac41 | 1899 | |
1da177e4 LT |
1900 | case fmov_op: |
1901 | /* an easy one */ | |
454854ac | 1902 | MIPS_FPU_EMU_INC_STATS(mov_s); |
1da177e4 LT |
1903 | SPFROMREG(rv.s, MIPSInst_FS(ir)); |
1904 | goto copcsr; | |
1905 | ||
1906 | /* binary op on handler */ | |
3f7cac41 RB |
1907 | scopbop: |
1908 | SPFROMREG(fs, MIPSInst_FS(ir)); | |
1909 | SPFROMREG(ft, MIPSInst_FT(ir)); | |
1da177e4 | 1910 | |
3f7cac41 RB |
1911 | rv.s = (*handler.b) (fs, ft); |
1912 | goto copcsr; | |
1913 | scopuop: | |
1914 | SPFROMREG(fs, MIPSInst_FS(ir)); | |
1915 | rv.s = (*handler.u) (fs); | |
1916 | goto copcsr; | |
1917 | copcsr: | |
c4103526 DCZ |
1918 | if (ieee754_cxtest(IEEE754_INEXACT)) { |
1919 | MIPS_FPU_EMU_INC_STATS(ieee754_inexact); | |
1da177e4 | 1920 | rcsr |= FPU_CSR_INE_X | FPU_CSR_INE_S; |
c4103526 DCZ |
1921 | } |
1922 | if (ieee754_cxtest(IEEE754_UNDERFLOW)) { | |
1923 | MIPS_FPU_EMU_INC_STATS(ieee754_underflow); | |
1da177e4 | 1924 | rcsr |= FPU_CSR_UDF_X | FPU_CSR_UDF_S; |
c4103526 DCZ |
1925 | } |
1926 | if (ieee754_cxtest(IEEE754_OVERFLOW)) { | |
1927 | MIPS_FPU_EMU_INC_STATS(ieee754_overflow); | |
1da177e4 | 1928 | rcsr |= FPU_CSR_OVF_X | FPU_CSR_OVF_S; |
c4103526 DCZ |
1929 | } |
1930 | if (ieee754_cxtest(IEEE754_ZERO_DIVIDE)) { | |
1931 | MIPS_FPU_EMU_INC_STATS(ieee754_zerodiv); | |
1da177e4 | 1932 | rcsr |= FPU_CSR_DIV_X | FPU_CSR_DIV_S; |
c4103526 DCZ |
1933 | } |
1934 | if (ieee754_cxtest(IEEE754_INVALID_OPERATION)) { | |
1935 | MIPS_FPU_EMU_INC_STATS(ieee754_invalidop); | |
1da177e4 | 1936 | rcsr |= FPU_CSR_INV_X | FPU_CSR_INV_S; |
c4103526 | 1937 | } |
1da177e4 LT |
1938 | break; |
1939 | ||
1940 | /* unary conv ops */ | |
1941 | case fcvts_op: | |
1942 | return SIGILL; /* not defined */ | |
1da177e4 | 1943 | |
3f7cac41 | 1944 | case fcvtd_op: |
454854ac | 1945 | MIPS_FPU_EMU_INC_STATS(cvt_d_s); |
1da177e4 LT |
1946 | SPFROMREG(fs, MIPSInst_FS(ir)); |
1947 | rv.d = ieee754dp_fsp(fs); | |
1948 | rfmt = d_fmt; | |
1949 | goto copcsr; | |
1da177e4 | 1950 | |
3f7cac41 | 1951 | case fcvtw_op: |
454854ac | 1952 | MIPS_FPU_EMU_INC_STATS(cvt_w_s); |
1da177e4 LT |
1953 | SPFROMREG(fs, MIPSInst_FS(ir)); |
1954 | rv.w = ieee754sp_tint(fs); | |
1955 | rfmt = w_fmt; | |
1956 | goto copcsr; | |
1da177e4 | 1957 | |
1da177e4 LT |
1958 | case fround_op: |
1959 | case ftrunc_op: | |
1960 | case fceil_op: | |
3f7cac41 | 1961 | case ffloor_op: |
2d83fea7 | 1962 | if (!cpu_has_mips_2_3_4_5_r) |
08a07904 RB |
1963 | return SIGILL; |
1964 | ||
454854ac AM |
1965 | if (MIPSInst_FUNC(ir) == fceil_op) |
1966 | MIPS_FPU_EMU_INC_STATS(ceil_w_s); | |
1967 | if (MIPSInst_FUNC(ir) == ffloor_op) | |
1968 | MIPS_FPU_EMU_INC_STATS(floor_w_s); | |
1969 | if (MIPSInst_FUNC(ir) == fround_op) | |
1970 | MIPS_FPU_EMU_INC_STATS(round_w_s); | |
1971 | if (MIPSInst_FUNC(ir) == ftrunc_op) | |
1972 | MIPS_FPU_EMU_INC_STATS(trunc_w_s); | |
1973 | ||
3f7cac41 | 1974 | oldrm = ieee754_csr.rm; |
1da177e4 | 1975 | SPFROMREG(fs, MIPSInst_FS(ir)); |
2cfcf8a8 | 1976 | ieee754_csr.rm = MIPSInst_FUNC(ir); |
1da177e4 LT |
1977 | rv.w = ieee754sp_tint(fs); |
1978 | ieee754_csr.rm = oldrm; | |
1979 | rfmt = w_fmt; | |
1980 | goto copcsr; | |
1da177e4 | 1981 | |
4b820d95 PB |
1982 | case fsel_op: |
1983 | if (!cpu_has_mips_r6) | |
1984 | return SIGILL; | |
1985 | ||
454854ac | 1986 | MIPS_FPU_EMU_INC_STATS(sel_s); |
4b820d95 PB |
1987 | SPFROMREG(fd, MIPSInst_FD(ir)); |
1988 | if (fd.bits & 0x1) | |
1989 | SPFROMREG(rv.s, MIPSInst_FT(ir)); | |
1990 | else | |
1991 | SPFROMREG(rv.s, MIPSInst_FS(ir)); | |
1992 | break; | |
1993 | ||
3f7cac41 | 1994 | case fcvtl_op: |
2d83fea7 | 1995 | if (!cpu_has_mips_3_4_5_64_r2_r6) |
08a07904 RB |
1996 | return SIGILL; |
1997 | ||
454854ac | 1998 | MIPS_FPU_EMU_INC_STATS(cvt_l_s); |
1da177e4 LT |
1999 | SPFROMREG(fs, MIPSInst_FS(ir)); |
2000 | rv.l = ieee754sp_tlong(fs); | |
2001 | rfmt = l_fmt; | |
2002 | goto copcsr; | |
1da177e4 LT |
2003 | |
2004 | case froundl_op: | |
2005 | case ftruncl_op: | |
2006 | case fceill_op: | |
3f7cac41 | 2007 | case ffloorl_op: |
2d83fea7 | 2008 | if (!cpu_has_mips_3_4_5_64_r2_r6) |
08a07904 RB |
2009 | return SIGILL; |
2010 | ||
454854ac AM |
2011 | if (MIPSInst_FUNC(ir) == fceill_op) |
2012 | MIPS_FPU_EMU_INC_STATS(ceil_l_s); | |
2013 | if (MIPSInst_FUNC(ir) == ffloorl_op) | |
2014 | MIPS_FPU_EMU_INC_STATS(floor_l_s); | |
2015 | if (MIPSInst_FUNC(ir) == froundl_op) | |
2016 | MIPS_FPU_EMU_INC_STATS(round_l_s); | |
2017 | if (MIPSInst_FUNC(ir) == ftruncl_op) | |
2018 | MIPS_FPU_EMU_INC_STATS(trunc_l_s); | |
2019 | ||
3f7cac41 | 2020 | oldrm = ieee754_csr.rm; |
1da177e4 | 2021 | SPFROMREG(fs, MIPSInst_FS(ir)); |
2cfcf8a8 | 2022 | ieee754_csr.rm = MIPSInst_FUNC(ir); |
1da177e4 LT |
2023 | rv.l = ieee754sp_tlong(fs); |
2024 | ieee754_csr.rm = oldrm; | |
2025 | rfmt = l_fmt; | |
2026 | goto copcsr; | |
1da177e4 LT |
2027 | |
2028 | default: | |
f8c3c671 | 2029 | if (!NO_R6EMU && MIPSInst_FUNC(ir) >= fcmp_op) { |
a58f85b5 | 2030 | unsigned int cmpop; |
2209bcb1 | 2031 | union ieee754sp fs, ft; |
1da177e4 | 2032 | |
a58f85b5 | 2033 | cmpop = MIPSInst_FUNC(ir) - fcmp_op; |
1da177e4 LT |
2034 | SPFROMREG(fs, MIPSInst_FS(ir)); |
2035 | SPFROMREG(ft, MIPSInst_FT(ir)); | |
2036 | rv.w = ieee754sp_cmp(fs, ft, | |
2037 | cmptab[cmpop & 0x7], cmpop & 0x8); | |
2038 | rfmt = -1; | |
2039 | if ((cmpop & 0x8) && ieee754_cxtest | |
2040 | (IEEE754_INVALID_OPERATION)) | |
2041 | rcsr = FPU_CSR_INV_X | FPU_CSR_INV_S; | |
2042 | else | |
2043 | goto copcsr; | |
2044 | ||
3f7cac41 | 2045 | } else |
1da177e4 | 2046 | return SIGILL; |
1da177e4 LT |
2047 | break; |
2048 | } | |
2049 | break; | |
2050 | } | |
2051 | ||
3f7cac41 | 2052 | case d_fmt: { |
4b820d95 | 2053 | union ieee754dp fd, fs, ft; |
1da177e4 | 2054 | union { |
2209bcb1 RB |
2055 | union ieee754dp(*b) (union ieee754dp, union ieee754dp); |
2056 | union ieee754dp(*u) (union ieee754dp); | |
1da177e4 LT |
2057 | } handler; |
2058 | ||
2059 | switch (MIPSInst_FUNC(ir)) { | |
2060 | /* binary ops */ | |
2061 | case fadd_op: | |
454854ac | 2062 | MIPS_FPU_EMU_INC_STATS(add_d); |
1da177e4 LT |
2063 | handler.b = ieee754dp_add; |
2064 | goto dcopbop; | |
2065 | case fsub_op: | |
454854ac | 2066 | MIPS_FPU_EMU_INC_STATS(sub_d); |
1da177e4 LT |
2067 | handler.b = ieee754dp_sub; |
2068 | goto dcopbop; | |
2069 | case fmul_op: | |
454854ac | 2070 | MIPS_FPU_EMU_INC_STATS(mul_d); |
1da177e4 LT |
2071 | handler.b = ieee754dp_mul; |
2072 | goto dcopbop; | |
2073 | case fdiv_op: | |
454854ac | 2074 | MIPS_FPU_EMU_INC_STATS(div_d); |
1da177e4 LT |
2075 | handler.b = ieee754dp_div; |
2076 | goto dcopbop; | |
2077 | ||
2078 | /* unary ops */ | |
1da177e4 | 2079 | case fsqrt_op: |
08a07904 RB |
2080 | if (!cpu_has_mips_2_3_4_5_r) |
2081 | return SIGILL; | |
2082 | ||
454854ac | 2083 | MIPS_FPU_EMU_INC_STATS(sqrt_d); |
1da177e4 LT |
2084 | handler.u = ieee754dp_sqrt; |
2085 | goto dcopuop; | |
08a07904 RB |
2086 | /* |
2087 | * Note that on some MIPS IV implementations such as the | |
2088 | * R5000 and R8000 the FSQRT and FRECIP instructions do not | |
2089 | * achieve full IEEE-754 accuracy - however this emulator does. | |
2090 | */ | |
1da177e4 | 2091 | case frsqrt_op: |
2d83fea7 | 2092 | if (!cpu_has_mips_4_5_64_r2_r6) |
08a07904 RB |
2093 | return SIGILL; |
2094 | ||
454854ac | 2095 | MIPS_FPU_EMU_INC_STATS(rsqrt_d); |
1da177e4 LT |
2096 | handler.u = fpemu_dp_rsqrt; |
2097 | goto dcopuop; | |
2098 | case frecip_op: | |
2d83fea7 | 2099 | if (!cpu_has_mips_4_5_64_r2_r6) |
08a07904 RB |
2100 | return SIGILL; |
2101 | ||
454854ac | 2102 | MIPS_FPU_EMU_INC_STATS(recip_d); |
1da177e4 LT |
2103 | handler.u = fpemu_dp_recip; |
2104 | goto dcopuop; | |
1da177e4 | 2105 | case fmovc_op: |
08a07904 RB |
2106 | if (!cpu_has_mips_4_5_r) |
2107 | return SIGILL; | |
2108 | ||
1da177e4 LT |
2109 | cond = fpucondbit[MIPSInst_FT(ir) >> 2]; |
2110 | if (((ctx->fcr31 & cond) != 0) != | |
2111 | ((MIPSInst_FT(ir) & 1) != 0)) | |
2112 | return 0; | |
2113 | DPFROMREG(rv.d, MIPSInst_FS(ir)); | |
2114 | break; | |
2115 | case fmovz_op: | |
08a07904 RB |
2116 | if (!cpu_has_mips_4_5_r) |
2117 | return SIGILL; | |
2118 | ||
1da177e4 LT |
2119 | if (xcp->regs[MIPSInst_FT(ir)] != 0) |
2120 | return 0; | |
2121 | DPFROMREG(rv.d, MIPSInst_FS(ir)); | |
2122 | break; | |
2123 | case fmovn_op: | |
08a07904 RB |
2124 | if (!cpu_has_mips_4_5_r) |
2125 | return SIGILL; | |
2126 | ||
1da177e4 LT |
2127 | if (xcp->regs[MIPSInst_FT(ir)] == 0) |
2128 | return 0; | |
2129 | DPFROMREG(rv.d, MIPSInst_FS(ir)); | |
2130 | break; | |
67613f02 MC |
2131 | |
2132 | case fseleqz_op: | |
2133 | if (!cpu_has_mips_r6) | |
2134 | return SIGILL; | |
2135 | ||
454854ac | 2136 | MIPS_FPU_EMU_INC_STATS(seleqz_d); |
67613f02 MC |
2137 | DPFROMREG(rv.d, MIPSInst_FT(ir)); |
2138 | if (rv.l & 0x1) | |
2139 | rv.l = 0; | |
2140 | else | |
2141 | DPFROMREG(rv.d, MIPSInst_FS(ir)); | |
2142 | break; | |
2143 | ||
130fe357 MC |
2144 | case fselnez_op: |
2145 | if (!cpu_has_mips_r6) | |
2146 | return SIGILL; | |
2147 | ||
454854ac | 2148 | MIPS_FPU_EMU_INC_STATS(selnez_d); |
130fe357 MC |
2149 | DPFROMREG(rv.d, MIPSInst_FT(ir)); |
2150 | if (rv.l & 0x1) | |
2151 | DPFROMREG(rv.d, MIPSInst_FS(ir)); | |
2152 | else | |
2153 | rv.l = 0; | |
2154 | break; | |
2155 | ||
e24c3bec MC |
2156 | case fmaddf_op: { |
2157 | union ieee754dp ft, fs, fd; | |
2158 | ||
2159 | if (!cpu_has_mips_r6) | |
2160 | return SIGILL; | |
2161 | ||
454854ac | 2162 | MIPS_FPU_EMU_INC_STATS(maddf_d); |
e24c3bec MC |
2163 | DPFROMREG(ft, MIPSInst_FT(ir)); |
2164 | DPFROMREG(fs, MIPSInst_FS(ir)); | |
2165 | DPFROMREG(fd, MIPSInst_FD(ir)); | |
2166 | rv.d = ieee754dp_maddf(fd, fs, ft); | |
409fcace | 2167 | goto copcsr; |
e24c3bec MC |
2168 | } |
2169 | ||
83d43305 MC |
2170 | case fmsubf_op: { |
2171 | union ieee754dp ft, fs, fd; | |
2172 | ||
2173 | if (!cpu_has_mips_r6) | |
2174 | return SIGILL; | |
2175 | ||
454854ac | 2176 | MIPS_FPU_EMU_INC_STATS(msubf_d); |
83d43305 MC |
2177 | DPFROMREG(ft, MIPSInst_FT(ir)); |
2178 | DPFROMREG(fs, MIPSInst_FS(ir)); | |
2179 | DPFROMREG(fd, MIPSInst_FD(ir)); | |
2180 | rv.d = ieee754dp_msubf(fd, fs, ft); | |
409fcace | 2181 | goto copcsr; |
83d43305 MC |
2182 | } |
2183 | ||
400bd2e4 MC |
2184 | case frint_op: { |
2185 | union ieee754dp fs; | |
2186 | ||
2187 | if (!cpu_has_mips_r6) | |
2188 | return SIGILL; | |
2189 | ||
454854ac | 2190 | MIPS_FPU_EMU_INC_STATS(rint_d); |
400bd2e4 | 2191 | DPFROMREG(fs, MIPSInst_FS(ir)); |
3ec404d8 | 2192 | rv.d = ieee754dp_rint(fs); |
400bd2e4 MC |
2193 | goto copcsr; |
2194 | } | |
2195 | ||
38db37ba MC |
2196 | case fclass_op: { |
2197 | union ieee754dp fs; | |
2198 | ||
2199 | if (!cpu_has_mips_r6) | |
2200 | return SIGILL; | |
2201 | ||
454854ac | 2202 | MIPS_FPU_EMU_INC_STATS(class_d); |
38db37ba | 2203 | DPFROMREG(fs, MIPSInst_FS(ir)); |
e1231dd6 AM |
2204 | rv.l = ieee754dp_2008class(fs); |
2205 | rfmt = l_fmt; | |
409fcace | 2206 | goto copcsr; |
38db37ba MC |
2207 | } |
2208 | ||
4e9561b2 MC |
2209 | case fmin_op: { |
2210 | union ieee754dp fs, ft; | |
2211 | ||
2212 | if (!cpu_has_mips_r6) | |
2213 | return SIGILL; | |
2214 | ||
454854ac | 2215 | MIPS_FPU_EMU_INC_STATS(min_d); |
4e9561b2 MC |
2216 | DPFROMREG(ft, MIPSInst_FT(ir)); |
2217 | DPFROMREG(fs, MIPSInst_FS(ir)); | |
2218 | rv.d = ieee754dp_fmin(fs, ft); | |
409fcace | 2219 | goto copcsr; |
4e9561b2 MC |
2220 | } |
2221 | ||
2222 | case fmina_op: { | |
2223 | union ieee754dp fs, ft; | |
2224 | ||
2225 | if (!cpu_has_mips_r6) | |
2226 | return SIGILL; | |
2227 | ||
454854ac | 2228 | MIPS_FPU_EMU_INC_STATS(mina_d); |
4e9561b2 MC |
2229 | DPFROMREG(ft, MIPSInst_FT(ir)); |
2230 | DPFROMREG(fs, MIPSInst_FS(ir)); | |
2231 | rv.d = ieee754dp_fmina(fs, ft); | |
409fcace | 2232 | goto copcsr; |
4e9561b2 MC |
2233 | } |
2234 | ||
a79f5f9b MC |
2235 | case fmax_op: { |
2236 | union ieee754dp fs, ft; | |
2237 | ||
2238 | if (!cpu_has_mips_r6) | |
2239 | return SIGILL; | |
2240 | ||
454854ac | 2241 | MIPS_FPU_EMU_INC_STATS(max_d); |
a79f5f9b MC |
2242 | DPFROMREG(ft, MIPSInst_FT(ir)); |
2243 | DPFROMREG(fs, MIPSInst_FS(ir)); | |
2244 | rv.d = ieee754dp_fmax(fs, ft); | |
409fcace | 2245 | goto copcsr; |
a79f5f9b MC |
2246 | } |
2247 | ||
2248 | case fmaxa_op: { | |
2249 | union ieee754dp fs, ft; | |
2250 | ||
2251 | if (!cpu_has_mips_r6) | |
2252 | return SIGILL; | |
2253 | ||
454854ac | 2254 | MIPS_FPU_EMU_INC_STATS(maxa_d); |
a79f5f9b MC |
2255 | DPFROMREG(ft, MIPSInst_FT(ir)); |
2256 | DPFROMREG(fs, MIPSInst_FS(ir)); | |
2257 | rv.d = ieee754dp_fmaxa(fs, ft); | |
409fcace | 2258 | goto copcsr; |
a79f5f9b MC |
2259 | } |
2260 | ||
1da177e4 | 2261 | case fabs_op: |
454854ac | 2262 | MIPS_FPU_EMU_INC_STATS(abs_d); |
1da177e4 LT |
2263 | handler.u = ieee754dp_abs; |
2264 | goto dcopuop; | |
2265 | ||
2266 | case fneg_op: | |
454854ac | 2267 | MIPS_FPU_EMU_INC_STATS(neg_d); |
1da177e4 LT |
2268 | handler.u = ieee754dp_neg; |
2269 | goto dcopuop; | |
2270 | ||
2271 | case fmov_op: | |
2272 | /* an easy one */ | |
454854ac | 2273 | MIPS_FPU_EMU_INC_STATS(mov_d); |
1da177e4 LT |
2274 | DPFROMREG(rv.d, MIPSInst_FS(ir)); |
2275 | goto copcsr; | |
2276 | ||
2277 | /* binary op on handler */ | |
3f7cac41 RB |
2278 | dcopbop: |
2279 | DPFROMREG(fs, MIPSInst_FS(ir)); | |
2280 | DPFROMREG(ft, MIPSInst_FT(ir)); | |
1da177e4 | 2281 | |
3f7cac41 RB |
2282 | rv.d = (*handler.b) (fs, ft); |
2283 | goto copcsr; | |
2284 | dcopuop: | |
2285 | DPFROMREG(fs, MIPSInst_FS(ir)); | |
2286 | rv.d = (*handler.u) (fs); | |
2287 | goto copcsr; | |
1da177e4 | 2288 | |
3f7cac41 RB |
2289 | /* |
2290 | * unary conv ops | |
2291 | */ | |
2292 | case fcvts_op: | |
454854ac | 2293 | MIPS_FPU_EMU_INC_STATS(cvt_s_d); |
1da177e4 LT |
2294 | DPFROMREG(fs, MIPSInst_FS(ir)); |
2295 | rv.s = ieee754sp_fdp(fs); | |
2296 | rfmt = s_fmt; | |
2297 | goto copcsr; | |
3f7cac41 | 2298 | |
1da177e4 LT |
2299 | case fcvtd_op: |
2300 | return SIGILL; /* not defined */ | |
2301 | ||
3f7cac41 | 2302 | case fcvtw_op: |
454854ac | 2303 | MIPS_FPU_EMU_INC_STATS(cvt_w_d); |
1da177e4 LT |
2304 | DPFROMREG(fs, MIPSInst_FS(ir)); |
2305 | rv.w = ieee754dp_tint(fs); /* wrong */ | |
2306 | rfmt = w_fmt; | |
2307 | goto copcsr; | |
1da177e4 | 2308 | |
1da177e4 LT |
2309 | case fround_op: |
2310 | case ftrunc_op: | |
2311 | case fceil_op: | |
3f7cac41 | 2312 | case ffloor_op: |
08a07904 RB |
2313 | if (!cpu_has_mips_2_3_4_5_r) |
2314 | return SIGILL; | |
2315 | ||
454854ac AM |
2316 | if (MIPSInst_FUNC(ir) == fceil_op) |
2317 | MIPS_FPU_EMU_INC_STATS(ceil_w_d); | |
2318 | if (MIPSInst_FUNC(ir) == ffloor_op) | |
2319 | MIPS_FPU_EMU_INC_STATS(floor_w_d); | |
2320 | if (MIPSInst_FUNC(ir) == fround_op) | |
2321 | MIPS_FPU_EMU_INC_STATS(round_w_d); | |
2322 | if (MIPSInst_FUNC(ir) == ftrunc_op) | |
2323 | MIPS_FPU_EMU_INC_STATS(trunc_w_d); | |
2324 | ||
3f7cac41 | 2325 | oldrm = ieee754_csr.rm; |
1da177e4 | 2326 | DPFROMREG(fs, MIPSInst_FS(ir)); |
2cfcf8a8 | 2327 | ieee754_csr.rm = MIPSInst_FUNC(ir); |
1da177e4 LT |
2328 | rv.w = ieee754dp_tint(fs); |
2329 | ieee754_csr.rm = oldrm; | |
2330 | rfmt = w_fmt; | |
2331 | goto copcsr; | |
1da177e4 | 2332 | |
4b820d95 PB |
2333 | case fsel_op: |
2334 | if (!cpu_has_mips_r6) | |
2335 | return SIGILL; | |
2336 | ||
454854ac | 2337 | MIPS_FPU_EMU_INC_STATS(sel_d); |
4b820d95 PB |
2338 | DPFROMREG(fd, MIPSInst_FD(ir)); |
2339 | if (fd.bits & 0x1) | |
2340 | DPFROMREG(rv.d, MIPSInst_FT(ir)); | |
2341 | else | |
2342 | DPFROMREG(rv.d, MIPSInst_FS(ir)); | |
2343 | break; | |
2344 | ||
3f7cac41 | 2345 | case fcvtl_op: |
2d83fea7 | 2346 | if (!cpu_has_mips_3_4_5_64_r2_r6) |
08a07904 RB |
2347 | return SIGILL; |
2348 | ||
454854ac | 2349 | MIPS_FPU_EMU_INC_STATS(cvt_l_d); |
1da177e4 LT |
2350 | DPFROMREG(fs, MIPSInst_FS(ir)); |
2351 | rv.l = ieee754dp_tlong(fs); | |
2352 | rfmt = l_fmt; | |
2353 | goto copcsr; | |
1da177e4 LT |
2354 | |
2355 | case froundl_op: | |
2356 | case ftruncl_op: | |
2357 | case fceill_op: | |
3f7cac41 | 2358 | case ffloorl_op: |
2d83fea7 | 2359 | if (!cpu_has_mips_3_4_5_64_r2_r6) |
08a07904 RB |
2360 | return SIGILL; |
2361 | ||
454854ac AM |
2362 | if (MIPSInst_FUNC(ir) == fceill_op) |
2363 | MIPS_FPU_EMU_INC_STATS(ceil_l_d); | |
2364 | if (MIPSInst_FUNC(ir) == ffloorl_op) | |
2365 | MIPS_FPU_EMU_INC_STATS(floor_l_d); | |
2366 | if (MIPSInst_FUNC(ir) == froundl_op) | |
2367 | MIPS_FPU_EMU_INC_STATS(round_l_d); | |
2368 | if (MIPSInst_FUNC(ir) == ftruncl_op) | |
2369 | MIPS_FPU_EMU_INC_STATS(trunc_l_d); | |
2370 | ||
3f7cac41 | 2371 | oldrm = ieee754_csr.rm; |
1da177e4 | 2372 | DPFROMREG(fs, MIPSInst_FS(ir)); |
2cfcf8a8 | 2373 | ieee754_csr.rm = MIPSInst_FUNC(ir); |
1da177e4 LT |
2374 | rv.l = ieee754dp_tlong(fs); |
2375 | ieee754_csr.rm = oldrm; | |
2376 | rfmt = l_fmt; | |
2377 | goto copcsr; | |
1da177e4 LT |
2378 | |
2379 | default: | |
f8c3c671 | 2380 | if (!NO_R6EMU && MIPSInst_FUNC(ir) >= fcmp_op) { |
a58f85b5 | 2381 | unsigned int cmpop; |
2209bcb1 | 2382 | union ieee754dp fs, ft; |
1da177e4 | 2383 | |
a58f85b5 | 2384 | cmpop = MIPSInst_FUNC(ir) - fcmp_op; |
1da177e4 LT |
2385 | DPFROMREG(fs, MIPSInst_FS(ir)); |
2386 | DPFROMREG(ft, MIPSInst_FT(ir)); | |
2387 | rv.w = ieee754dp_cmp(fs, ft, | |
2388 | cmptab[cmpop & 0x7], cmpop & 0x8); | |
2389 | rfmt = -1; | |
2390 | if ((cmpop & 0x8) | |
2391 | && | |
2392 | ieee754_cxtest | |
2393 | (IEEE754_INVALID_OPERATION)) | |
2394 | rcsr = FPU_CSR_INV_X | FPU_CSR_INV_S; | |
2395 | else | |
2396 | goto copcsr; | |
2397 | ||
2398 | } | |
2399 | else { | |
2400 | return SIGILL; | |
2401 | } | |
2402 | break; | |
2403 | } | |
2404 | break; | |
bbdd8147 MC |
2405 | } |
2406 | ||
2407 | case w_fmt: { | |
2408 | union ieee754dp fs; | |
1da177e4 LT |
2409 | |
2410 | switch (MIPSInst_FUNC(ir)) { | |
2411 | case fcvts_op: | |
2412 | /* convert word to single precision real */ | |
454854ac | 2413 | MIPS_FPU_EMU_INC_STATS(cvt_s_w); |
1da177e4 LT |
2414 | SPFROMREG(fs, MIPSInst_FS(ir)); |
2415 | rv.s = ieee754sp_fint(fs.bits); | |
2416 | rfmt = s_fmt; | |
2417 | goto copcsr; | |
1da177e4 LT |
2418 | case fcvtd_op: |
2419 | /* convert word to double precision real */ | |
454854ac | 2420 | MIPS_FPU_EMU_INC_STATS(cvt_d_w); |
1da177e4 LT |
2421 | SPFROMREG(fs, MIPSInst_FS(ir)); |
2422 | rv.d = ieee754dp_fint(fs.bits); | |
2423 | rfmt = d_fmt; | |
2424 | goto copcsr; | |
f8c3c671 MC |
2425 | default: { |
2426 | /* Emulating the new CMP.condn.fmt R6 instruction */ | |
2427 | #define CMPOP_MASK 0x7 | |
2428 | #define SIGN_BIT (0x1 << 3) | |
2429 | #define PREDICATE_BIT (0x1 << 4) | |
2430 | ||
2431 | int cmpop = MIPSInst_FUNC(ir) & CMPOP_MASK; | |
2432 | int sig = MIPSInst_FUNC(ir) & SIGN_BIT; | |
2433 | union ieee754sp fs, ft; | |
2434 | ||
2435 | /* This is an R6 only instruction */ | |
2436 | if (!cpu_has_mips_r6 || | |
2437 | (MIPSInst_FUNC(ir) & 0x20)) | |
2438 | return SIGILL; | |
2439 | ||
454854ac AM |
2440 | if (!sig) { |
2441 | if (!(MIPSInst_FUNC(ir) & PREDICATE_BIT)) { | |
2442 | switch (cmpop) { | |
2443 | case 0: | |
2444 | MIPS_FPU_EMU_INC_STATS(cmp_af_s); | |
2445 | break; | |
2446 | case 1: | |
2447 | MIPS_FPU_EMU_INC_STATS(cmp_un_s); | |
2448 | break; | |
2449 | case 2: | |
2450 | MIPS_FPU_EMU_INC_STATS(cmp_eq_s); | |
2451 | break; | |
2452 | case 3: | |
2453 | MIPS_FPU_EMU_INC_STATS(cmp_ueq_s); | |
2454 | break; | |
2455 | case 4: | |
2456 | MIPS_FPU_EMU_INC_STATS(cmp_lt_s); | |
2457 | break; | |
2458 | case 5: | |
2459 | MIPS_FPU_EMU_INC_STATS(cmp_ult_s); | |
2460 | break; | |
2461 | case 6: | |
2462 | MIPS_FPU_EMU_INC_STATS(cmp_le_s); | |
2463 | break; | |
2464 | case 7: | |
2465 | MIPS_FPU_EMU_INC_STATS(cmp_ule_s); | |
2466 | break; | |
2467 | } | |
2468 | } else { | |
2469 | switch (cmpop) { | |
2470 | case 1: | |
2471 | MIPS_FPU_EMU_INC_STATS(cmp_or_s); | |
2472 | break; | |
2473 | case 2: | |
2474 | MIPS_FPU_EMU_INC_STATS(cmp_une_s); | |
2475 | break; | |
2476 | case 3: | |
2477 | MIPS_FPU_EMU_INC_STATS(cmp_ne_s); | |
2478 | break; | |
2479 | } | |
2480 | } | |
2481 | } else { | |
2482 | if (!(MIPSInst_FUNC(ir) & PREDICATE_BIT)) { | |
2483 | switch (cmpop) { | |
2484 | case 0: | |
2485 | MIPS_FPU_EMU_INC_STATS(cmp_saf_s); | |
2486 | break; | |
2487 | case 1: | |
2488 | MIPS_FPU_EMU_INC_STATS(cmp_sun_s); | |
2489 | break; | |
2490 | case 2: | |
2491 | MIPS_FPU_EMU_INC_STATS(cmp_seq_s); | |
2492 | break; | |
2493 | case 3: | |
2494 | MIPS_FPU_EMU_INC_STATS(cmp_sueq_s); | |
2495 | break; | |
2496 | case 4: | |
2497 | MIPS_FPU_EMU_INC_STATS(cmp_slt_s); | |
2498 | break; | |
2499 | case 5: | |
2500 | MIPS_FPU_EMU_INC_STATS(cmp_sult_s); | |
2501 | break; | |
2502 | case 6: | |
2503 | MIPS_FPU_EMU_INC_STATS(cmp_sle_s); | |
2504 | break; | |
2505 | case 7: | |
2506 | MIPS_FPU_EMU_INC_STATS(cmp_sule_s); | |
2507 | break; | |
2508 | } | |
2509 | } else { | |
2510 | switch (cmpop) { | |
2511 | case 1: | |
2512 | MIPS_FPU_EMU_INC_STATS(cmp_sor_s); | |
2513 | break; | |
2514 | case 2: | |
2515 | MIPS_FPU_EMU_INC_STATS(cmp_sune_s); | |
2516 | break; | |
2517 | case 3: | |
2518 | MIPS_FPU_EMU_INC_STATS(cmp_sne_s); | |
2519 | break; | |
2520 | } | |
2521 | } | |
2522 | } | |
2523 | ||
f8c3c671 MC |
2524 | /* fmt is w_fmt for single precision so fix it */ |
2525 | rfmt = s_fmt; | |
2526 | /* default to false */ | |
2527 | rv.w = 0; | |
2528 | ||
2529 | /* CMP.condn.S */ | |
2530 | SPFROMREG(fs, MIPSInst_FS(ir)); | |
2531 | SPFROMREG(ft, MIPSInst_FT(ir)); | |
2532 | ||
2533 | /* positive predicates */ | |
2534 | if (!(MIPSInst_FUNC(ir) & PREDICATE_BIT)) { | |
2535 | if (ieee754sp_cmp(fs, ft, cmptab[cmpop], | |
2536 | sig)) | |
2537 | rv.w = -1; /* true, all 1s */ | |
2538 | if ((sig) && | |
2539 | ieee754_cxtest(IEEE754_INVALID_OPERATION)) | |
2540 | rcsr = FPU_CSR_INV_X | FPU_CSR_INV_S; | |
2541 | else | |
2542 | goto copcsr; | |
2543 | } else { | |
2544 | /* negative predicates */ | |
2545 | switch (cmpop) { | |
2546 | case 1: | |
2547 | case 2: | |
2548 | case 3: | |
2549 | if (ieee754sp_cmp(fs, ft, | |
2550 | negative_cmptab[cmpop], | |
2551 | sig)) | |
2552 | rv.w = -1; /* true, all 1s */ | |
2553 | if (sig && | |
2554 | ieee754_cxtest(IEEE754_INVALID_OPERATION)) | |
2555 | rcsr = FPU_CSR_INV_X | FPU_CSR_INV_S; | |
2556 | else | |
2557 | goto copcsr; | |
2558 | break; | |
2559 | default: | |
2560 | /* Reserved R6 ops */ | |
f8c3c671 MC |
2561 | return SIGILL; |
2562 | } | |
2563 | } | |
2564 | break; | |
2565 | } | |
1da177e4 | 2566 | } |
1ff8560a | 2567 | break; |
1da177e4 LT |
2568 | } |
2569 | ||
3f7cac41 | 2570 | case l_fmt: |
08a07904 | 2571 | |
2d83fea7 | 2572 | if (!cpu_has_mips_3_4_5_64_r2_r6) |
08a07904 RB |
2573 | return SIGILL; |
2574 | ||
bbd426f5 PB |
2575 | DIFROMREG(bits, MIPSInst_FS(ir)); |
2576 | ||
1da177e4 LT |
2577 | switch (MIPSInst_FUNC(ir)) { |
2578 | case fcvts_op: | |
2579 | /* convert long to single precision real */ | |
454854ac | 2580 | MIPS_FPU_EMU_INC_STATS(cvt_s_l); |
bbd426f5 | 2581 | rv.s = ieee754sp_flong(bits); |
1da177e4 LT |
2582 | rfmt = s_fmt; |
2583 | goto copcsr; | |
2584 | case fcvtd_op: | |
2585 | /* convert long to double precision real */ | |
454854ac | 2586 | MIPS_FPU_EMU_INC_STATS(cvt_d_l); |
bbd426f5 | 2587 | rv.d = ieee754dp_flong(bits); |
1da177e4 LT |
2588 | rfmt = d_fmt; |
2589 | goto copcsr; | |
f8c3c671 MC |
2590 | default: { |
2591 | /* Emulating the new CMP.condn.fmt R6 instruction */ | |
2592 | int cmpop = MIPSInst_FUNC(ir) & CMPOP_MASK; | |
2593 | int sig = MIPSInst_FUNC(ir) & SIGN_BIT; | |
2594 | union ieee754dp fs, ft; | |
2595 | ||
2596 | if (!cpu_has_mips_r6 || | |
2597 | (MIPSInst_FUNC(ir) & 0x20)) | |
2598 | return SIGILL; | |
2599 | ||
454854ac AM |
2600 | if (!sig) { |
2601 | if (!(MIPSInst_FUNC(ir) & PREDICATE_BIT)) { | |
2602 | switch (cmpop) { | |
2603 | case 0: | |
2604 | MIPS_FPU_EMU_INC_STATS(cmp_af_d); | |
2605 | break; | |
2606 | case 1: | |
2607 | MIPS_FPU_EMU_INC_STATS(cmp_un_d); | |
2608 | break; | |
2609 | case 2: | |
2610 | MIPS_FPU_EMU_INC_STATS(cmp_eq_d); | |
2611 | break; | |
2612 | case 3: | |
2613 | MIPS_FPU_EMU_INC_STATS(cmp_ueq_d); | |
2614 | break; | |
2615 | case 4: | |
2616 | MIPS_FPU_EMU_INC_STATS(cmp_lt_d); | |
2617 | break; | |
2618 | case 5: | |
2619 | MIPS_FPU_EMU_INC_STATS(cmp_ult_d); | |
2620 | break; | |
2621 | case 6: | |
2622 | MIPS_FPU_EMU_INC_STATS(cmp_le_d); | |
2623 | break; | |
2624 | case 7: | |
2625 | MIPS_FPU_EMU_INC_STATS(cmp_ule_d); | |
2626 | break; | |
2627 | } | |
2628 | } else { | |
2629 | switch (cmpop) { | |
2630 | case 1: | |
2631 | MIPS_FPU_EMU_INC_STATS(cmp_or_d); | |
2632 | break; | |
2633 | case 2: | |
2634 | MIPS_FPU_EMU_INC_STATS(cmp_une_d); | |
2635 | break; | |
2636 | case 3: | |
2637 | MIPS_FPU_EMU_INC_STATS(cmp_ne_d); | |
2638 | break; | |
2639 | } | |
2640 | } | |
2641 | } else { | |
2642 | if (!(MIPSInst_FUNC(ir) & PREDICATE_BIT)) { | |
2643 | switch (cmpop) { | |
2644 | case 0: | |
2645 | MIPS_FPU_EMU_INC_STATS(cmp_saf_d); | |
2646 | break; | |
2647 | case 1: | |
2648 | MIPS_FPU_EMU_INC_STATS(cmp_sun_d); | |
2649 | break; | |
2650 | case 2: | |
2651 | MIPS_FPU_EMU_INC_STATS(cmp_seq_d); | |
2652 | break; | |
2653 | case 3: | |
2654 | MIPS_FPU_EMU_INC_STATS(cmp_sueq_d); | |
2655 | break; | |
2656 | case 4: | |
2657 | MIPS_FPU_EMU_INC_STATS(cmp_slt_d); | |
2658 | break; | |
2659 | case 5: | |
2660 | MIPS_FPU_EMU_INC_STATS(cmp_sult_d); | |
2661 | break; | |
2662 | case 6: | |
2663 | MIPS_FPU_EMU_INC_STATS(cmp_sle_d); | |
2664 | break; | |
2665 | case 7: | |
2666 | MIPS_FPU_EMU_INC_STATS(cmp_sule_d); | |
2667 | break; | |
2668 | } | |
2669 | } else { | |
2670 | switch (cmpop) { | |
2671 | case 1: | |
2672 | MIPS_FPU_EMU_INC_STATS(cmp_sor_d); | |
2673 | break; | |
2674 | case 2: | |
2675 | MIPS_FPU_EMU_INC_STATS(cmp_sune_d); | |
2676 | break; | |
2677 | case 3: | |
2678 | MIPS_FPU_EMU_INC_STATS(cmp_sne_d); | |
2679 | break; | |
2680 | } | |
2681 | } | |
2682 | } | |
2683 | ||
f8c3c671 MC |
2684 | /* fmt is l_fmt for double precision so fix it */ |
2685 | rfmt = d_fmt; | |
2686 | /* default to false */ | |
2687 | rv.l = 0; | |
2688 | ||
2689 | /* CMP.condn.D */ | |
2690 | DPFROMREG(fs, MIPSInst_FS(ir)); | |
2691 | DPFROMREG(ft, MIPSInst_FT(ir)); | |
1da177e4 | 2692 | |
f8c3c671 MC |
2693 | /* positive predicates */ |
2694 | if (!(MIPSInst_FUNC(ir) & PREDICATE_BIT)) { | |
2695 | if (ieee754dp_cmp(fs, ft, | |
2696 | cmptab[cmpop], sig)) | |
2697 | rv.l = -1LL; /* true, all 1s */ | |
2698 | if (sig && | |
2699 | ieee754_cxtest(IEEE754_INVALID_OPERATION)) | |
2700 | rcsr = FPU_CSR_INV_X | FPU_CSR_INV_S; | |
2701 | else | |
2702 | goto copcsr; | |
2703 | } else { | |
2704 | /* negative predicates */ | |
2705 | switch (cmpop) { | |
2706 | case 1: | |
2707 | case 2: | |
2708 | case 3: | |
2709 | if (ieee754dp_cmp(fs, ft, | |
2710 | negative_cmptab[cmpop], | |
2711 | sig)) | |
2712 | rv.l = -1LL; /* true, all 1s */ | |
2713 | if (sig && | |
2714 | ieee754_cxtest(IEEE754_INVALID_OPERATION)) | |
2715 | rcsr = FPU_CSR_INV_X | FPU_CSR_INV_S; | |
2716 | else | |
2717 | goto copcsr; | |
2718 | break; | |
2719 | default: | |
2720 | /* Reserved R6 ops */ | |
f8c3c671 MC |
2721 | return SIGILL; |
2722 | } | |
2723 | } | |
2724 | break; | |
2725 | } | |
2726 | } | |
1ff8560a AM |
2727 | break; |
2728 | ||
1da177e4 LT |
2729 | default: |
2730 | return SIGILL; | |
2731 | } | |
2732 | ||
2733 | /* | |
2734 | * Update the fpu CSR register for this operation. | |
2735 | * If an exception is required, generate a tidy SIGFPE exception, | |
2736 | * without updating the result register. | |
2737 | * Note: cause exception bits do not accumulate, they are rewritten | |
2738 | * for each op; only the flag/sticky bits accumulate. | |
2739 | */ | |
2740 | ctx->fcr31 = (ctx->fcr31 & ~FPU_CSR_ALL_X) | rcsr; | |
2741 | if ((ctx->fcr31 >> 5) & ctx->fcr31 & FPU_CSR_ALL_E) { | |
3f7cac41 | 2742 | /*printk ("SIGFPE: FPU csr = %08x\n",ctx->fcr31); */ |
1da177e4 LT |
2743 | return SIGFPE; |
2744 | } | |
2745 | ||
2746 | /* | |
2747 | * Now we can safely write the result back to the register file. | |
2748 | */ | |
2749 | switch (rfmt) { | |
08a07904 RB |
2750 | case -1: |
2751 | ||
2752 | if (cpu_has_mips_4_5_r) | |
c3b9b945 | 2753 | cbit = fpucondbit[MIPSInst_FD(ir) >> 2]; |
08a07904 RB |
2754 | else |
2755 | cbit = FPU_CSR_COND; | |
1da177e4 | 2756 | if (rv.w) |
08a07904 | 2757 | ctx->fcr31 |= cbit; |
1da177e4 | 2758 | else |
08a07904 | 2759 | ctx->fcr31 &= ~cbit; |
1da177e4 | 2760 | break; |
08a07904 | 2761 | |
1da177e4 LT |
2762 | case d_fmt: |
2763 | DPTOREG(rv.d, MIPSInst_FD(ir)); | |
2764 | break; | |
1da177e4 LT |
2765 | case s_fmt: |
2766 | SPTOREG(rv.s, MIPSInst_FD(ir)); | |
2767 | break; | |
2768 | case w_fmt: | |
2769 | SITOREG(rv.w, MIPSInst_FD(ir)); | |
2770 | break; | |
1da177e4 | 2771 | case l_fmt: |
2d83fea7 | 2772 | if (!cpu_has_mips_3_4_5_64_r2_r6) |
08a07904 RB |
2773 | return SIGILL; |
2774 | ||
1da177e4 LT |
2775 | DITOREG(rv.l, MIPSInst_FD(ir)); |
2776 | break; | |
1da177e4 LT |
2777 | default: |
2778 | return SIGILL; | |
2779 | } | |
2780 | ||
2781 | return 0; | |
2782 | } | |
2783 | ||
13769eba MR |
2784 | /* |
2785 | * Emulate FPU instructions. | |
2786 | * | |
2787 | * If we use FPU hardware, then we have been typically called to handle | |
2788 | * an unimplemented operation, such as where an operand is a NaN or | |
2789 | * denormalized. In that case exit the emulation loop after a single | |
2790 | * iteration so as to let hardware execute any subsequent instructions. | |
2791 | * | |
2792 | * If we have no FPU hardware or it has been disabled, then continue | |
2793 | * emulating floating-point instructions until one of these conditions | |
2794 | * has occurred: | |
2795 | * | |
2796 | * - a non-FPU instruction has been encountered, | |
2797 | * | |
2798 | * - an attempt to emulate has ended with a signal, | |
2799 | * | |
2800 | * - the ISA mode has been switched. | |
2801 | * | |
2802 | * We need to terminate the emulation loop if we got switched to the | |
2803 | * MIPS16 mode, whether supported or not, so that we do not attempt | |
2804 | * to emulate a MIPS16 instruction as a regular MIPS FPU instruction. | |
2805 | * Similarly if we got switched to the microMIPS mode and only the | |
2806 | * regular MIPS mode is supported, so that we do not attempt to emulate | |
2807 | * a microMIPS instruction as a regular MIPS FPU instruction. Or if | |
2808 | * we got switched to the regular MIPS mode and only the microMIPS mode | |
2809 | * is supported, so that we do not attempt to emulate a regular MIPS | |
2810 | * instruction that should cause an Address Error exception instead. | |
2811 | * For simplicity we always terminate upon an ISA mode switch. | |
2812 | */ | |
e04582b7 | 2813 | int fpu_emulator_cop1Handler(struct pt_regs *xcp, struct mips_fpu_struct *ctx, |
445a58ce | 2814 | int has_fpu, void __user **fault_addr) |
1da177e4 | 2815 | { |
333d1f67 | 2816 | unsigned long oldepc, prevepc; |
102cedc3 LY |
2817 | struct mm_decoded_insn dec_insn; |
2818 | u16 instr[4]; | |
2819 | u16 *instr_ptr; | |
1da177e4 LT |
2820 | int sig = 0; |
2821 | ||
1975ed43 PB |
2822 | /* |
2823 | * Initialize context if it hasn't been used already, otherwise ensure | |
2824 | * it has been saved to struct thread_struct. | |
2825 | */ | |
2826 | if (!init_fp_ctx(current)) | |
2827 | lose_fpu(1); | |
2828 | ||
1da177e4 LT |
2829 | oldepc = xcp->cp0_epc; |
2830 | do { | |
2831 | prevepc = xcp->cp0_epc; | |
2832 | ||
102cedc3 LY |
2833 | if (get_isa16_mode(prevepc) && cpu_has_mmips) { |
2834 | /* | |
2835 | * Get next 2 microMIPS instructions and convert them | |
2836 | * into 32-bit instructions. | |
2837 | */ | |
2838 | if ((get_user(instr[0], (u16 __user *)msk_isa16_mode(xcp->cp0_epc))) || | |
2839 | (get_user(instr[1], (u16 __user *)msk_isa16_mode(xcp->cp0_epc + 2))) || | |
2840 | (get_user(instr[2], (u16 __user *)msk_isa16_mode(xcp->cp0_epc + 4))) || | |
2841 | (get_user(instr[3], (u16 __user *)msk_isa16_mode(xcp->cp0_epc + 6)))) { | |
2842 | MIPS_FPU_EMU_INC_STATS(errors); | |
2843 | return SIGBUS; | |
2844 | } | |
2845 | instr_ptr = instr; | |
2846 | ||
2847 | /* Get first instruction. */ | |
2848 | if (mm_insn_16bit(*instr_ptr)) { | |
2849 | /* Duplicate the half-word. */ | |
2850 | dec_insn.insn = (*instr_ptr << 16) | | |
2851 | (*instr_ptr); | |
2852 | /* 16-bit instruction. */ | |
2853 | dec_insn.pc_inc = 2; | |
2854 | instr_ptr += 1; | |
2855 | } else { | |
2856 | dec_insn.insn = (*instr_ptr << 16) | | |
2857 | *(instr_ptr+1); | |
2858 | /* 32-bit instruction. */ | |
2859 | dec_insn.pc_inc = 4; | |
2860 | instr_ptr += 2; | |
2861 | } | |
2862 | /* Get second instruction. */ | |
2863 | if (mm_insn_16bit(*instr_ptr)) { | |
2864 | /* Duplicate the half-word. */ | |
2865 | dec_insn.next_insn = (*instr_ptr << 16) | | |
2866 | (*instr_ptr); | |
2867 | /* 16-bit instruction. */ | |
2868 | dec_insn.next_pc_inc = 2; | |
2869 | } else { | |
2870 | dec_insn.next_insn = (*instr_ptr << 16) | | |
2871 | *(instr_ptr+1); | |
2872 | /* 32-bit instruction. */ | |
2873 | dec_insn.next_pc_inc = 4; | |
2874 | } | |
2875 | dec_insn.micro_mips_mode = 1; | |
2876 | } else { | |
2877 | if ((get_user(dec_insn.insn, | |
2878 | (mips_instruction __user *) xcp->cp0_epc)) || | |
2879 | (get_user(dec_insn.next_insn, | |
2880 | (mips_instruction __user *)(xcp->cp0_epc+4)))) { | |
2881 | MIPS_FPU_EMU_INC_STATS(errors); | |
2882 | return SIGBUS; | |
2883 | } | |
2884 | dec_insn.pc_inc = 4; | |
2885 | dec_insn.next_pc_inc = 4; | |
2886 | dec_insn.micro_mips_mode = 0; | |
515b029d | 2887 | } |
102cedc3 LY |
2888 | |
2889 | if ((dec_insn.insn == 0) || | |
2890 | ((dec_insn.pc_inc == 2) && | |
2891 | ((dec_insn.insn & 0xffff) == MM_NOP16))) | |
2892 | xcp->cp0_epc += dec_insn.pc_inc; /* Skip NOPs */ | |
1da177e4 | 2893 | else { |
cd21dfcf | 2894 | /* |
2cfcf8a8 MR |
2895 | * The 'ieee754_csr' is an alias of ctx->fcr31. |
2896 | * No need to copy ctx->fcr31 to ieee754_csr. | |
cd21dfcf | 2897 | */ |
102cedc3 | 2898 | sig = cop1Emulate(xcp, ctx, dec_insn, fault_addr); |
1da177e4 LT |
2899 | } |
2900 | ||
e04582b7 | 2901 | if (has_fpu) |
1da177e4 LT |
2902 | break; |
2903 | if (sig) | |
2904 | break; | |
13769eba MR |
2905 | /* |
2906 | * We have to check for the ISA bit explicitly here, | |
2907 | * because `get_isa16_mode' may return 0 if support | |
2908 | * for code compression has been globally disabled, | |
2909 | * or otherwise we may produce the wrong signal or | |
2910 | * even proceed successfully where we must not. | |
2911 | */ | |
2912 | if ((xcp->cp0_epc ^ prevepc) & 0x1) | |
2913 | break; | |
1da177e4 LT |
2914 | |
2915 | cond_resched(); | |
2916 | } while (xcp->cp0_epc > prevepc); | |
2917 | ||
2918 | /* SIGILL indicates a non-fpu instruction */ | |
2919 | if (sig == SIGILL && xcp->cp0_epc != oldepc) | |
3f7cac41 | 2920 | /* but if EPC has advanced, then ignore it */ |
1da177e4 LT |
2921 | sig = 0; |
2922 | ||
2923 | return sig; | |
2924 | } |