xref: /openbmc/qemu/target/mips/tcg/op_helper.c (revision 4d87fcdd) 
1 /*
2  *  MIPS emulation helpers for qemu.
3  *
4  *  Copyright (c) 2004-2005 Jocelyn Mayer
5  *
6  * This library is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * This library is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
18  *
19  */
20 
21 #include "qemu/osdep.h"
22 #include "cpu.h"
23 #include "internal.h"
24 #include "exec/helper-proto.h"
25 #include "exec/exec-all.h"
26 #include "exec/memop.h"
27 #include "fpu_helper.h"
28 
29 /* 64 bits arithmetic for 32 bits hosts */
30 static inline uint64_t get_HILO(CPUMIPSState *env)
31 {
32     return ((uint64_t)(env->active_tc.HI[0]) << 32) |
33            (uint32_t)env->active_tc.LO[0];
34 }
35 
36 static inline target_ulong set_HIT0_LO(CPUMIPSState *env, uint64_t HILO)
37 {
38     env->active_tc.LO[0] = (int32_t)(HILO & 0xFFFFFFFF);
39     return env->active_tc.HI[0] = (int32_t)(HILO >> 32);
40 }
41 
42 static inline target_ulong set_HI_LOT0(CPUMIPSState *env, uint64_t HILO)
43 {
44     target_ulong tmp = env->active_tc.LO[0] = (int32_t)(HILO & 0xFFFFFFFF);
45     env->active_tc.HI[0] = (int32_t)(HILO >> 32);
46     return tmp;
47 }
48 
49 /* Multiplication variants of the vr54xx. */
50 target_ulong helper_muls(CPUMIPSState *env, target_ulong arg1,
51                          target_ulong arg2)
52 {
53     return set_HI_LOT0(env, 0 - ((int64_t)(int32_t)arg1 *
54                                  (int64_t)(int32_t)arg2));
55 }
56 
57 target_ulong helper_mulsu(CPUMIPSState *env, target_ulong arg1,
58                           target_ulong arg2)
59 {
60     return set_HI_LOT0(env, 0 - (uint64_t)(uint32_t)arg1 *
61                        (uint64_t)(uint32_t)arg2);
62 }
63 
64 target_ulong helper_macc(CPUMIPSState *env, target_ulong arg1,
65                          target_ulong arg2)
66 {
67     return set_HI_LOT0(env, (int64_t)get_HILO(env) + (int64_t)(int32_t)arg1 *
68                        (int64_t)(int32_t)arg2);
69 }
70 
71 target_ulong helper_macchi(CPUMIPSState *env, target_ulong arg1,
72                            target_ulong arg2)
73 {
74     return set_HIT0_LO(env, (int64_t)get_HILO(env) + (int64_t)(int32_t)arg1 *
75                        (int64_t)(int32_t)arg2);
76 }
77 
78 target_ulong helper_maccu(CPUMIPSState *env, target_ulong arg1,
79                           target_ulong arg2)
80 {
81     return set_HI_LOT0(env, (uint64_t)get_HILO(env) +
82                        (uint64_t)(uint32_t)arg1 * (uint64_t)(uint32_t)arg2);
83 }
84 
85 target_ulong helper_macchiu(CPUMIPSState *env, target_ulong arg1,
86                             target_ulong arg2)
87 {
88     return set_HIT0_LO(env, (uint64_t)get_HILO(env) +
89                        (uint64_t)(uint32_t)arg1 * (uint64_t)(uint32_t)arg2);
90 }
91 
92 target_ulong helper_msac(CPUMIPSState *env, target_ulong arg1,
93                          target_ulong arg2)
94 {
95     return set_HI_LOT0(env, (int64_t)get_HILO(env) - (int64_t)(int32_t)arg1 *
96                        (int64_t)(int32_t)arg2);
97 }
98 
99 target_ulong helper_msachi(CPUMIPSState *env, target_ulong arg1,
100                            target_ulong arg2)
101 {
102     return set_HIT0_LO(env, (int64_t)get_HILO(env) - (int64_t)(int32_t)arg1 *
103                        (int64_t)(int32_t)arg2);
104 }
105 
106 target_ulong helper_msacu(CPUMIPSState *env, target_ulong arg1,
107                           target_ulong arg2)
108 {
109     return set_HI_LOT0(env, (uint64_t)get_HILO(env) -
110                        (uint64_t)(uint32_t)arg1 * (uint64_t)(uint32_t)arg2);
111 }
112 
113 target_ulong helper_msachiu(CPUMIPSState *env, target_ulong arg1,
114                             target_ulong arg2)
115 {
116     return set_HIT0_LO(env, (uint64_t)get_HILO(env) -
117                        (uint64_t)(uint32_t)arg1 * (uint64_t)(uint32_t)arg2);
118 }
119 
120 target_ulong helper_mulhi(CPUMIPSState *env, target_ulong arg1,
121                           target_ulong arg2)
122 {
123     return set_HIT0_LO(env, (int64_t)(int32_t)arg1 * (int64_t)(int32_t)arg2);
124 }
125 
126 target_ulong helper_mulhiu(CPUMIPSState *env, target_ulong arg1,
127                            target_ulong arg2)
128 {
129     return set_HIT0_LO(env, (uint64_t)(uint32_t)arg1 *
130                        (uint64_t)(uint32_t)arg2);
131 }
132 
133 target_ulong helper_mulshi(CPUMIPSState *env, target_ulong arg1,
134                            target_ulong arg2)
135 {
136     return set_HIT0_LO(env, 0 - (int64_t)(int32_t)arg1 *
137                        (int64_t)(int32_t)arg2);
138 }
139 
140 target_ulong helper_mulshiu(CPUMIPSState *env, target_ulong arg1,
141                             target_ulong arg2)
142 {
143     return set_HIT0_LO(env, 0 - (uint64_t)(uint32_t)arg1 *
144                        (uint64_t)(uint32_t)arg2);
145 }
146 
147 static inline target_ulong bitswap(target_ulong v)
148 {
149     v = ((v >> 1) & (target_ulong)0x5555555555555555ULL) |
150               ((v & (target_ulong)0x5555555555555555ULL) << 1);
151     v = ((v >> 2) & (target_ulong)0x3333333333333333ULL) |
152               ((v & (target_ulong)0x3333333333333333ULL) << 2);
153     v = ((v >> 4) & (target_ulong)0x0F0F0F0F0F0F0F0FULL) |
154               ((v & (target_ulong)0x0F0F0F0F0F0F0F0FULL) << 4);
155     return v;
156 }
157 
158 #ifdef TARGET_MIPS64
159 target_ulong helper_dbitswap(target_ulong rt)
160 {
161     return bitswap(rt);
162 }
163 #endif
164 
165 target_ulong helper_bitswap(target_ulong rt)
166 {
167     return (int32_t)bitswap(rt);
168 }
169 
170 target_ulong helper_rotx(target_ulong rs, uint32_t shift, uint32_t shiftx,
171                         uint32_t stripe)
172 {
173     int i;
174     uint64_t tmp0 = ((uint64_t)rs) << 32 | ((uint64_t)rs & 0xffffffff);
175     uint64_t tmp1 = tmp0;
176     for (i = 0; i <= 46; i++) {
177         int s;
178         if (i & 0x8) {
179             s = shift;
180         } else {
181             s = shiftx;
182         }
183 
184         if (stripe != 0 && !(i & 0x4)) {
185             s = ~s;
186         }
187         if (s & 0x10) {
188             if (tmp0 & (1LL << (i + 16))) {
189                 tmp1 |= 1LL << i;
190             } else {
191                 tmp1 &= ~(1LL << i);
192             }
193         }
194     }
195 
196     uint64_t tmp2 = tmp1;
197     for (i = 0; i <= 38; i++) {
198         int s;
199         if (i & 0x4) {
200             s = shift;
201         } else {
202             s = shiftx;
203         }
204 
205         if (s & 0x8) {
206             if (tmp1 & (1LL << (i + 8))) {
207                 tmp2 |= 1LL << i;
208             } else {
209                 tmp2 &= ~(1LL << i);
210             }
211         }
212     }
213 
214     uint64_t tmp3 = tmp2;
215     for (i = 0; i <= 34; i++) {
216         int s;
217         if (i & 0x2) {
218             s = shift;
219         } else {
220             s = shiftx;
221         }
222         if (s & 0x4) {
223             if (tmp2 & (1LL << (i + 4))) {
224                 tmp3 |= 1LL << i;
225             } else {
226                 tmp3 &= ~(1LL << i);
227             }
228         }
229     }
230 
231     uint64_t tmp4 = tmp3;
232     for (i = 0; i <= 32; i++) {
233         int s;
234         if (i & 0x1) {
235             s = shift;
236         } else {
237             s = shiftx;
238         }
239         if (s & 0x2) {
240             if (tmp3 & (1LL << (i + 2))) {
241                 tmp4 |= 1LL << i;
242             } else {
243                 tmp4 &= ~(1LL << i);
244             }
245         }
246     }
247 
248     uint64_t tmp5 = tmp4;
249     for (i = 0; i <= 31; i++) {
250         int s;
251         s = shift;
252         if (s & 0x1) {
253             if (tmp4 & (1LL << (i + 1))) {
254                 tmp5 |= 1LL << i;
255             } else {
256                 tmp5 &= ~(1LL << i);
257             }
258         }
259     }
260 
261     return (int64_t)(int32_t)(uint32_t)tmp5;
262 }
263 
264 void helper_fork(target_ulong arg1, target_ulong arg2)
265 {
266     /*
267      * arg1 = rt, arg2 = rs
268      * TODO: store to TC register
269      */
270 }
271 
272 target_ulong helper_yield(CPUMIPSState *env, target_ulong arg)
273 {
274     target_long arg1 = arg;
275 
276     if (arg1 < 0) {
277         /* No scheduling policy implemented. */
278         if (arg1 != -2) {
279             if (env->CP0_VPEControl & (1 << CP0VPECo_YSI) &&
280                 env->active_tc.CP0_TCStatus & (1 << CP0TCSt_DT)) {
281                 env->CP0_VPEControl &= ~(0x7 << CP0VPECo_EXCPT);
282                 env->CP0_VPEControl |= 4 << CP0VPECo_EXCPT;
283                 do_raise_exception(env, EXCP_THREAD, GETPC());
284             }
285         }
286     } else if (arg1 == 0) {
287         if (0) {
288             /* TODO: TC underflow */
289             env->CP0_VPEControl &= ~(0x7 << CP0VPECo_EXCPT);
290             do_raise_exception(env, EXCP_THREAD, GETPC());
291         } else {
292             /* TODO: Deallocate TC */
293         }
294     } else if (arg1 > 0) {
295         /* Yield qualifier inputs not implemented. */
296         env->CP0_VPEControl &= ~(0x7 << CP0VPECo_EXCPT);
297         env->CP0_VPEControl |= 2 << CP0VPECo_EXCPT;
298         do_raise_exception(env, EXCP_THREAD, GETPC());
299     }
300     return env->CP0_YQMask;
301 }
302 
303 static inline void check_hwrena(CPUMIPSState *env, int reg, uintptr_t pc)
304 {
305     if ((env->hflags & MIPS_HFLAG_CP0) || (env->CP0_HWREna & (1 << reg))) {
306         return;
307     }
308     do_raise_exception(env, EXCP_RI, pc);
309 }
310 
311 target_ulong helper_rdhwr_cpunum(CPUMIPSState *env)
312 {
313     check_hwrena(env, 0, GETPC());
314     return env->CP0_EBase & 0x3ff;
315 }
316 
317 target_ulong helper_rdhwr_synci_step(CPUMIPSState *env)
318 {
319     check_hwrena(env, 1, GETPC());
320     return env->SYNCI_Step;
321 }
322 
323 target_ulong helper_rdhwr_cc(CPUMIPSState *env)
324 {
325     check_hwrena(env, 2, GETPC());
326 #ifdef CONFIG_USER_ONLY
327     return env->CP0_Count;
328 #else
329     return (int32_t)cpu_mips_get_count(env);
330 #endif
331 }
332 
333 target_ulong helper_rdhwr_ccres(CPUMIPSState *env)
334 {
335     check_hwrena(env, 3, GETPC());
336     return env->CCRes;
337 }
338 
339 target_ulong helper_rdhwr_performance(CPUMIPSState *env)
340 {
341     check_hwrena(env, 4, GETPC());
342     return env->CP0_Performance0;
343 }
344 
345 target_ulong helper_rdhwr_xnp(CPUMIPSState *env)
346 {
347     check_hwrena(env, 5, GETPC());
348     return (env->CP0_Config5 >> CP0C5_XNP) & 1;
349 }
350 
351 void helper_pmon(CPUMIPSState *env, int function)
352 {
353     function /= 2;
354     switch (function) {
355     case 2: /* TODO: char inbyte(int waitflag); */
356         if (env->active_tc.gpr[4] == 0) {
357             env->active_tc.gpr[2] = -1;
358         }
359         /* Fall through */
360     case 11: /* TODO: char inbyte (void); */
361         env->active_tc.gpr[2] = -1;
362         break;
363     case 3:
364     case 12:
365         printf("%c", (char)(env->active_tc.gpr[4] & 0xFF));
366         break;
367     case 17:
368         break;
369     case 158:
370         {
371             unsigned char *fmt = (void *)(uintptr_t)env->active_tc.gpr[4];
372             printf("%s", fmt);
373         }
374         break;
375     }
376 }
377 
378 #if !defined(CONFIG_USER_ONLY)
379 
380 void mips_cpu_do_unaligned_access(CPUState *cs, vaddr addr,
381                                   MMUAccessType access_type,
382                                   int mmu_idx, uintptr_t retaddr)
383 {
384     MIPSCPU *cpu = MIPS_CPU(cs);
385     CPUMIPSState *env = &cpu->env;
386     int error_code = 0;
387     int excp;
388 
389     if (!(env->hflags & MIPS_HFLAG_DM)) {
390         env->CP0_BadVAddr = addr;
391     }
392 
393     if (access_type == MMU_DATA_STORE) {
394         excp = EXCP_AdES;
395     } else {
396         excp = EXCP_AdEL;
397         if (access_type == MMU_INST_FETCH) {
398             error_code |= EXCP_INST_NOTAVAIL;
399         }
400     }
401 
402     do_raise_exception_err(env, excp, error_code, retaddr);
403 }
404 
405 void mips_cpu_do_transaction_failed(CPUState *cs, hwaddr physaddr,
406                                     vaddr addr, unsigned size,
407                                     MMUAccessType access_type,
408                                     int mmu_idx, MemTxAttrs attrs,
409                                     MemTxResult response, uintptr_t retaddr)
410 {
411     MIPSCPU *cpu = MIPS_CPU(cs);
412     CPUMIPSState *env = &cpu->env;
413 
414     if (access_type == MMU_INST_FETCH) {
415         do_raise_exception(env, EXCP_IBE, retaddr);
416     } else {
417         do_raise_exception(env, EXCP_DBE, retaddr);
418     }
419 }
420 #endif /* !CONFIG_USER_ONLY */
421