xref: /openbmc/qemu/target/hppa/op_helper.c (revision 2e1cacfb) 
1 /*
2  * Helpers for HPPA instructions.
3  *
4  * Copyright (c) 2016 Richard Henderson <rth@twiddle.net>
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 #include "qemu/osdep.h"
21 #include "qemu/log.h"
22 #include "cpu.h"
23 #include "exec/exec-all.h"
24 #include "exec/helper-proto.h"
25 #include "exec/cpu_ldst.h"
26 #include "qemu/timer.h"
27 #include "trace.h"
28 
29 G_NORETURN void HELPER(excp)(CPUHPPAState *env, int excp)
30 {
31     CPUState *cs = env_cpu(env);
32 
33     cs->exception_index = excp;
34     cpu_loop_exit(cs);
35 }
36 
37 G_NORETURN void hppa_dynamic_excp(CPUHPPAState *env, int excp, uintptr_t ra)
38 {
39     CPUState *cs = env_cpu(env);
40 
41     cs->exception_index = excp;
42     cpu_loop_exit_restore(cs, ra);
43 }
44 
45 static void atomic_store_mask32(CPUHPPAState *env, target_ulong addr,
46                                 uint32_t val, uint32_t mask, uintptr_t ra)
47 {
48     int mmu_idx = cpu_mmu_index(env_cpu(env), 0);
49     uint32_t old, new, cmp, *haddr;
50     void *vaddr;
51 
52     vaddr = probe_access(env, addr, 3, MMU_DATA_STORE, mmu_idx, ra);
53     if (vaddr == NULL) {
54         cpu_loop_exit_atomic(env_cpu(env), ra);
55     }
56     haddr = (uint32_t *)((uintptr_t)vaddr & -4);
57     mask = addr & 1 ? 0x00ffffffu : 0xffffff00u;
58 
59     old = *haddr;
60     while (1) {
61         new = be32_to_cpu((cpu_to_be32(old) & ~mask) | (val & mask));
62         cmp = qatomic_cmpxchg(haddr, old, new);
63         if (cmp == old) {
64             return;
65         }
66         old = cmp;
67     }
68 }
69 
70 static void atomic_store_mask64(CPUHPPAState *env, target_ulong addr,
71                                 uint64_t val, uint64_t mask,
72                                 int size, uintptr_t ra)
73 {
74 #ifdef CONFIG_ATOMIC64
75     int mmu_idx = cpu_mmu_index(env_cpu(env), 0);
76     uint64_t old, new, cmp, *haddr;
77     void *vaddr;
78 
79     vaddr = probe_access(env, addr, size, MMU_DATA_STORE, mmu_idx, ra);
80     if (vaddr == NULL) {
81         cpu_loop_exit_atomic(env_cpu(env), ra);
82     }
83     haddr = (uint64_t *)((uintptr_t)vaddr & -8);
84 
85     old = *haddr;
86     while (1) {
87         new = be32_to_cpu((cpu_to_be32(old) & ~mask) | (val & mask));
88         cmp = qatomic_cmpxchg__nocheck(haddr, old, new);
89         if (cmp == old) {
90             return;
91         }
92         old = cmp;
93     }
94 #else
95     cpu_loop_exit_atomic(env_cpu(env), ra);
96 #endif
97 }
98 
99 static void do_stby_b(CPUHPPAState *env, target_ulong addr, target_ulong val,
100                       bool parallel, uintptr_t ra)
101 {
102     switch (addr & 3) {
103     case 3:
104         cpu_stb_data_ra(env, addr, val, ra);
105         break;
106     case 2:
107         cpu_stw_data_ra(env, addr, val, ra);
108         break;
109     case 1:
110         /* The 3 byte store must appear atomic.  */
111         if (parallel) {
112             atomic_store_mask32(env, addr, val, 0x00ffffffu, ra);
113         } else {
114             cpu_stb_data_ra(env, addr, val >> 16, ra);
115             cpu_stw_data_ra(env, addr + 1, val, ra);
116         }
117         break;
118     default:
119         cpu_stl_data_ra(env, addr, val, ra);
120         break;
121     }
122 }
123 
124 static void do_stdby_b(CPUHPPAState *env, target_ulong addr, uint64_t val,
125                        bool parallel, uintptr_t ra)
126 {
127     switch (addr & 7) {
128     case 7:
129         cpu_stb_data_ra(env, addr, val, ra);
130         break;
131     case 6:
132         cpu_stw_data_ra(env, addr, val, ra);
133         break;
134     case 5:
135         /* The 3 byte store must appear atomic.  */
136         if (parallel) {
137             atomic_store_mask32(env, addr, val, 0x00ffffffu, ra);
138         } else {
139             cpu_stb_data_ra(env, addr, val >> 16, ra);
140             cpu_stw_data_ra(env, addr + 1, val, ra);
141         }
142         break;
143     case 4:
144         cpu_stl_data_ra(env, addr, val, ra);
145         break;
146     case 3:
147         /* The 5 byte store must appear atomic.  */
148         if (parallel) {
149             atomic_store_mask64(env, addr, val, 0x000000ffffffffffull, 5, ra);
150         } else {
151             cpu_stb_data_ra(env, addr, val >> 32, ra);
152             cpu_stl_data_ra(env, addr + 1, val, ra);
153         }
154         break;
155     case 2:
156         /* The 6 byte store must appear atomic.  */
157         if (parallel) {
158             atomic_store_mask64(env, addr, val, 0x0000ffffffffffffull, 6, ra);
159         } else {
160             cpu_stw_data_ra(env, addr, val >> 32, ra);
161             cpu_stl_data_ra(env, addr + 2, val, ra);
162         }
163         break;
164     case 1:
165         /* The 7 byte store must appear atomic.  */
166         if (parallel) {
167             atomic_store_mask64(env, addr, val, 0x00ffffffffffffffull, 7, ra);
168         } else {
169             cpu_stb_data_ra(env, addr, val >> 48, ra);
170             cpu_stw_data_ra(env, addr + 1, val >> 32, ra);
171             cpu_stl_data_ra(env, addr + 3, val, ra);
172         }
173         break;
174     default:
175         cpu_stq_data_ra(env, addr, val, ra);
176         break;
177     }
178 }
179 
180 void HELPER(stby_b)(CPUHPPAState *env, target_ulong addr, target_ulong val)
181 {
182     do_stby_b(env, addr, val, false, GETPC());
183 }
184 
185 void HELPER(stby_b_parallel)(CPUHPPAState *env, target_ulong addr,
186                              target_ulong val)
187 {
188     do_stby_b(env, addr, val, true, GETPC());
189 }
190 
191 void HELPER(stdby_b)(CPUHPPAState *env, target_ulong addr, target_ulong val)
192 {
193     do_stdby_b(env, addr, val, false, GETPC());
194 }
195 
196 void HELPER(stdby_b_parallel)(CPUHPPAState *env, target_ulong addr,
197                               target_ulong val)
198 {
199     do_stdby_b(env, addr, val, true, GETPC());
200 }
201 
202 static void do_stby_e(CPUHPPAState *env, target_ulong addr, target_ulong val,
203                       bool parallel, uintptr_t ra)
204 {
205     switch (addr & 3) {
206     case 3:
207         /* The 3 byte store must appear atomic.  */
208         if (parallel) {
209             atomic_store_mask32(env, addr - 3, val, 0xffffff00u, ra);
210         } else {
211             cpu_stw_data_ra(env, addr - 3, val >> 16, ra);
212             cpu_stb_data_ra(env, addr - 1, val >> 8, ra);
213         }
214         break;
215     case 2:
216         cpu_stw_data_ra(env, addr - 2, val >> 16, ra);
217         break;
218     case 1:
219         cpu_stb_data_ra(env, addr - 1, val >> 24, ra);
220         break;
221     default:
222         /* Nothing is stored, but protection is checked and the
223            cacheline is marked dirty.  */
224         probe_write(env, addr, 0, cpu_mmu_index(env_cpu(env), 0), ra);
225         break;
226     }
227 }
228 
229 static void do_stdby_e(CPUHPPAState *env, target_ulong addr, uint64_t val,
230                        bool parallel, uintptr_t ra)
231 {
232     switch (addr & 7) {
233     case 7:
234         /* The 7 byte store must appear atomic.  */
235         if (parallel) {
236             atomic_store_mask64(env, addr - 7, val,
237                                 0xffffffffffffff00ull, 7, ra);
238         } else {
239             cpu_stl_data_ra(env, addr - 7, val >> 32, ra);
240             cpu_stw_data_ra(env, addr - 3, val >> 16, ra);
241             cpu_stb_data_ra(env, addr - 1, val >> 8, ra);
242         }
243         break;
244     case 6:
245         /* The 6 byte store must appear atomic.  */
246         if (parallel) {
247             atomic_store_mask64(env, addr - 6, val,
248                                 0xffffffffffff0000ull, 6, ra);
249         } else {
250             cpu_stl_data_ra(env, addr - 6, val >> 32, ra);
251             cpu_stw_data_ra(env, addr - 2, val >> 16, ra);
252         }
253         break;
254     case 5:
255         /* The 5 byte store must appear atomic.  */
256         if (parallel) {
257             atomic_store_mask64(env, addr - 5, val,
258                                 0xffffffffff000000ull, 5, ra);
259         } else {
260             cpu_stl_data_ra(env, addr - 5, val >> 32, ra);
261             cpu_stb_data_ra(env, addr - 1, val >> 24, ra);
262         }
263         break;
264     case 4:
265         cpu_stl_data_ra(env, addr - 4, val >> 32, ra);
266         break;
267     case 3:
268         /* The 3 byte store must appear atomic.  */
269         if (parallel) {
270             atomic_store_mask32(env, addr - 3, val >> 32, 0xffffff00u, ra);
271         } else {
272             cpu_stw_data_ra(env, addr - 3, val >> 48, ra);
273             cpu_stb_data_ra(env, addr - 1, val >> 40, ra);
274         }
275         break;
276     case 2:
277         cpu_stw_data_ra(env, addr - 2, val >> 48, ra);
278         break;
279     case 1:
280         cpu_stb_data_ra(env, addr - 1, val >> 56, ra);
281         break;
282     default:
283         /* Nothing is stored, but protection is checked and the
284            cacheline is marked dirty.  */
285         probe_write(env, addr, 0, cpu_mmu_index(env_cpu(env), 0), ra);
286         break;
287     }
288 }
289 
290 void HELPER(stby_e)(CPUHPPAState *env, target_ulong addr, target_ulong val)
291 {
292     do_stby_e(env, addr, val, false, GETPC());
293 }
294 
295 void HELPER(stby_e_parallel)(CPUHPPAState *env, target_ulong addr,
296                              target_ulong val)
297 {
298     do_stby_e(env, addr, val, true, GETPC());
299 }
300 
301 void HELPER(stdby_e)(CPUHPPAState *env, target_ulong addr, target_ulong val)
302 {
303     do_stdby_e(env, addr, val, false, GETPC());
304 }
305 
306 void HELPER(stdby_e_parallel)(CPUHPPAState *env, target_ulong addr,
307                               target_ulong val)
308 {
309     do_stdby_e(env, addr, val, true, GETPC());
310 }
311 
312 void HELPER(ldc_check)(target_ulong addr)
313 {
314     if (unlikely(addr & 0xf)) {
315         qemu_log_mask(LOG_GUEST_ERROR,
316                       "Undefined ldc to unaligned address mod 16: "
317                       TARGET_FMT_lx "\n", addr);
318     }
319 }
320 
321 target_ulong HELPER(probe)(CPUHPPAState *env, target_ulong addr,
322                           uint32_t level, uint32_t want)
323 {
324 #ifdef CONFIG_USER_ONLY
325     return page_check_range(addr, 1, want);
326 #else
327     int prot, excp, mmu_idx;
328     hwaddr phys;
329 
330     trace_hppa_tlb_probe(addr, level, want);
331     /* Fail if the requested privilege level is higher than current.  */
332     if (level < (env->iaoq_f & 3)) {
333         return 0;
334     }
335 
336     mmu_idx = PRIV_P_TO_MMU_IDX(level, env->psw & PSW_P);
337     excp = hppa_get_physical_address(env, addr, mmu_idx, 0, 0, &phys, &prot);
338     if (excp >= 0) {
339         cpu_restore_state(env_cpu(env), GETPC());
340         hppa_set_ior_and_isr(env, addr, MMU_IDX_MMU_DISABLED(mmu_idx));
341         if (excp == EXCP_DTLB_MISS) {
342             excp = EXCP_NA_DTLB_MISS;
343         }
344         helper_excp(env, excp);
345     }
346     return (want & prot) != 0;
347 #endif
348 }
349 
350 target_ulong HELPER(read_interval_timer)(void)
351 {
352 #ifdef CONFIG_USER_ONLY
353     /* In user-mode, QEMU_CLOCK_VIRTUAL doesn't exist.
354        Just pass through the host cpu clock ticks.  */
355     return cpu_get_host_ticks();
356 #else
357     /* In system mode we have access to a decent high-resolution clock.
358        In order to make OS-level time accounting work with the cr16,
359        present it with a well-timed clock fixed at 250MHz.  */
360     return qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) >> 2;
361 #endif
362 }
363 
364 uint64_t HELPER(hadd_ss)(uint64_t r1, uint64_t r2)
365 {
366     uint64_t ret = 0;
367 
368     for (int i = 0; i < 64; i += 16) {
369         int f1 = sextract64(r1, i, 16);
370         int f2 = sextract64(r2, i, 16);
371         int fr = f1 + f2;
372 
373         fr = MIN(fr, INT16_MAX);
374         fr = MAX(fr, INT16_MIN);
375         ret = deposit64(ret, i, 16, fr);
376     }
377     return ret;
378 }
379 
380 uint64_t HELPER(hadd_us)(uint64_t r1, uint64_t r2)
381 {
382     uint64_t ret = 0;
383 
384     for (int i = 0; i < 64; i += 16) {
385         int f1 = extract64(r1, i, 16);
386         int f2 = sextract64(r2, i, 16);
387         int fr = f1 + f2;
388 
389         fr = MIN(fr, UINT16_MAX);
390         fr = MAX(fr, 0);
391         ret = deposit64(ret, i, 16, fr);
392     }
393     return ret;
394 }
395 
396 uint64_t HELPER(havg)(uint64_t r1, uint64_t r2)
397 {
398     uint64_t ret = 0;
399 
400     for (int i = 0; i < 64; i += 16) {
401         int f1 = extract64(r1, i, 16);
402         int f2 = extract64(r2, i, 16);
403         int fr = f1 + f2;
404 
405         ret = deposit64(ret, i, 16, (fr >> 1) | (fr & 1));
406     }
407     return ret;
408 }
409 
410 uint64_t HELPER(hsub_ss)(uint64_t r1, uint64_t r2)
411 {
412     uint64_t ret = 0;
413 
414     for (int i = 0; i < 64; i += 16) {
415         int f1 = sextract64(r1, i, 16);
416         int f2 = sextract64(r2, i, 16);
417         int fr = f1 - f2;
418 
419         fr = MIN(fr, INT16_MAX);
420         fr = MAX(fr, INT16_MIN);
421         ret = deposit64(ret, i, 16, fr);
422     }
423     return ret;
424 }
425 
426 uint64_t HELPER(hsub_us)(uint64_t r1, uint64_t r2)
427 {
428     uint64_t ret = 0;
429 
430     for (int i = 0; i < 64; i += 16) {
431         int f1 = extract64(r1, i, 16);
432         int f2 = sextract64(r2, i, 16);
433         int fr = f1 - f2;
434 
435         fr = MIN(fr, UINT16_MAX);
436         fr = MAX(fr, 0);
437         ret = deposit64(ret, i, 16, fr);
438     }
439     return ret;
440 }
441 
442 uint64_t HELPER(hshladd)(uint64_t r1, uint64_t r2, uint32_t sh)
443 {
444     uint64_t ret = 0;
445 
446     for (int i = 0; i < 64; i += 16) {
447         int f1 = sextract64(r1, i, 16);
448         int f2 = sextract64(r2, i, 16);
449         int fr = (f1 << sh) + f2;
450 
451         fr = MIN(fr, INT16_MAX);
452         fr = MAX(fr, INT16_MIN);
453         ret = deposit64(ret, i, 16, fr);
454     }
455     return ret;
456 }
457 
458 uint64_t HELPER(hshradd)(uint64_t r1, uint64_t r2, uint32_t sh)
459 {
460     uint64_t ret = 0;
461 
462     for (int i = 0; i < 64; i += 16) {
463         int f1 = sextract64(r1, i, 16);
464         int f2 = sextract64(r2, i, 16);
465         int fr = (f1 >> sh) + f2;
466 
467         fr = MIN(fr, INT16_MAX);
468         fr = MAX(fr, INT16_MIN);
469         ret = deposit64(ret, i, 16, fr);
470     }
471     return ret;
472 }
473