1 /*
2 * Alpha emulation cpu definitions for qemu.
3 *
4 * Copyright (c) 2007 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 #ifndef ALPHA_CPU_H
21 #define ALPHA_CPU_H
22
23 #include "cpu-qom.h"
24 #include "exec/cpu-common.h"
25 #include "exec/cpu-defs.h"
26 #include "exec/cpu-interrupt.h"
27 #include "qemu/cpu-float.h"
28
29 #define ICACHE_LINE_SIZE 32
30 #define DCACHE_LINE_SIZE 32
31
32 /* Alpha major type */
33 enum {
34 ALPHA_EV3 = 1,
35 ALPHA_EV4 = 2,
36 ALPHA_SIM = 3,
37 ALPHA_LCA = 4,
38 ALPHA_EV5 = 5, /* 21164 */
39 ALPHA_EV45 = 6, /* 21064A */
40 ALPHA_EV56 = 7, /* 21164A */
41 };
42
43 /* EV4 minor type */
44 enum {
45 ALPHA_EV4_2 = 0,
46 ALPHA_EV4_3 = 1,
47 };
48
49 /* LCA minor type */
50 enum {
51 ALPHA_LCA_1 = 1, /* 21066 */
52 ALPHA_LCA_2 = 2, /* 20166 */
53 ALPHA_LCA_3 = 3, /* 21068 */
54 ALPHA_LCA_4 = 4, /* 21068 */
55 ALPHA_LCA_5 = 5, /* 21066A */
56 ALPHA_LCA_6 = 6, /* 21068A */
57 };
58
59 /* EV5 minor type */
60 enum {
61 ALPHA_EV5_1 = 1, /* Rev BA, CA */
62 ALPHA_EV5_2 = 2, /* Rev DA, EA */
63 ALPHA_EV5_3 = 3, /* Pass 3 */
64 ALPHA_EV5_4 = 4, /* Pass 3.2 */
65 ALPHA_EV5_5 = 5, /* Pass 4 */
66 };
67
68 /* EV45 minor type */
69 enum {
70 ALPHA_EV45_1 = 1, /* Pass 1 */
71 ALPHA_EV45_2 = 2, /* Pass 1.1 */
72 ALPHA_EV45_3 = 3, /* Pass 2 */
73 };
74
75 /* EV56 minor type */
76 enum {
77 ALPHA_EV56_1 = 1, /* Pass 1 */
78 ALPHA_EV56_2 = 2, /* Pass 2 */
79 };
80
81 enum {
82 IMPLVER_2106x = 0, /* EV4, EV45 & LCA45 */
83 IMPLVER_21164 = 1, /* EV5, EV56 & PCA45 */
84 IMPLVER_21264 = 2, /* EV6, EV67 & EV68x */
85 IMPLVER_21364 = 3, /* EV7 & EV79 */
86 };
87
88 enum {
89 AMASK_BWX = 0x00000001,
90 AMASK_FIX = 0x00000002,
91 AMASK_CIX = 0x00000004,
92 AMASK_MVI = 0x00000100,
93 AMASK_TRAP = 0x00000200,
94 AMASK_PREFETCH = 0x00001000,
95 };
96
97 enum {
98 VAX_ROUND_NORMAL = 0,
99 VAX_ROUND_CHOPPED,
100 };
101
102 enum {
103 IEEE_ROUND_NORMAL = 0,
104 IEEE_ROUND_DYNAMIC,
105 IEEE_ROUND_PLUS,
106 IEEE_ROUND_MINUS,
107 IEEE_ROUND_CHOPPED,
108 };
109
110 /* IEEE floating-point operations encoding */
111 /* Trap mode */
112 enum {
113 FP_TRAP_I = 0x0,
114 FP_TRAP_U = 0x1,
115 FP_TRAP_S = 0x4,
116 FP_TRAP_SU = 0x5,
117 FP_TRAP_SUI = 0x7,
118 };
119
120 /* Rounding mode */
121 enum {
122 FP_ROUND_CHOPPED = 0x0,
123 FP_ROUND_MINUS = 0x1,
124 FP_ROUND_NORMAL = 0x2,
125 FP_ROUND_DYNAMIC = 0x3,
126 };
127
128 /* FPCR bits -- right-shifted 32 so we can use a uint32_t. */
129 #define FPCR_SUM (1U << (63 - 32))
130 #define FPCR_INED (1U << (62 - 32))
131 #define FPCR_UNFD (1U << (61 - 32))
132 #define FPCR_UNDZ (1U << (60 - 32))
133 #define FPCR_DYN_SHIFT (58 - 32)
134 #define FPCR_DYN_CHOPPED (0U << FPCR_DYN_SHIFT)
135 #define FPCR_DYN_MINUS (1U << FPCR_DYN_SHIFT)
136 #define FPCR_DYN_NORMAL (2U << FPCR_DYN_SHIFT)
137 #define FPCR_DYN_PLUS (3U << FPCR_DYN_SHIFT)
138 #define FPCR_DYN_MASK (3U << FPCR_DYN_SHIFT)
139 #define FPCR_IOV (1U << (57 - 32))
140 #define FPCR_INE (1U << (56 - 32))
141 #define FPCR_UNF (1U << (55 - 32))
142 #define FPCR_OVF (1U << (54 - 32))
143 #define FPCR_DZE (1U << (53 - 32))
144 #define FPCR_INV (1U << (52 - 32))
145 #define FPCR_OVFD (1U << (51 - 32))
146 #define FPCR_DZED (1U << (50 - 32))
147 #define FPCR_INVD (1U << (49 - 32))
148 #define FPCR_DNZ (1U << (48 - 32))
149 #define FPCR_DNOD (1U << (47 - 32))
150 #define FPCR_STATUS_MASK (FPCR_IOV | FPCR_INE | FPCR_UNF \
151 | FPCR_OVF | FPCR_DZE | FPCR_INV)
152
153 /* The silly software trap enables implemented by the kernel emulation.
154 These are more or less architecturally required, since the real hardware
155 has read-as-zero bits in the FPCR when the features aren't implemented.
156 For the purposes of QEMU, we pretend the FPCR can hold everything. */
157 #define SWCR_TRAP_ENABLE_INV (1U << 1)
158 #define SWCR_TRAP_ENABLE_DZE (1U << 2)
159 #define SWCR_TRAP_ENABLE_OVF (1U << 3)
160 #define SWCR_TRAP_ENABLE_UNF (1U << 4)
161 #define SWCR_TRAP_ENABLE_INE (1U << 5)
162 #define SWCR_TRAP_ENABLE_DNO (1U << 6)
163 #define SWCR_TRAP_ENABLE_MASK ((1U << 7) - (1U << 1))
164
165 #define SWCR_MAP_DMZ (1U << 12)
166 #define SWCR_MAP_UMZ (1U << 13)
167 #define SWCR_MAP_MASK (SWCR_MAP_DMZ | SWCR_MAP_UMZ)
168
169 #define SWCR_STATUS_INV (1U << 17)
170 #define SWCR_STATUS_DZE (1U << 18)
171 #define SWCR_STATUS_OVF (1U << 19)
172 #define SWCR_STATUS_UNF (1U << 20)
173 #define SWCR_STATUS_INE (1U << 21)
174 #define SWCR_STATUS_DNO (1U << 22)
175 #define SWCR_STATUS_MASK ((1U << 23) - (1U << 17))
176
177 #define SWCR_STATUS_TO_EXCSUM_SHIFT 16
178
179 #define SWCR_MASK (SWCR_TRAP_ENABLE_MASK | SWCR_MAP_MASK | SWCR_STATUS_MASK)
180
181 /* MMU modes definitions */
182
183 /* Alpha has 5 MMU modes: PALcode, Kernel, Executive, Supervisor, and User.
184 The Unix PALcode only exposes the kernel and user modes; presumably
185 executive and supervisor are used by VMS.
186
187 PALcode itself uses physical mode for code and kernel mode for data;
188 there are PALmode instructions that can access data via physical mode
189 or via an os-installed "alternate mode", which is one of the 4 above.
190
191 That said, we're only emulating Unix PALcode, and not attempting VMS,
192 so we don't need to implement Executive and Supervisor. QEMU's own
193 PALcode cheats and uses the KSEG mapping for its code+data rather than
194 physical addresses. */
195
196 #define MMU_KERNEL_IDX 0
197 #define MMU_USER_IDX 1
198 #define MMU_PHYS_IDX 2
199
200 typedef struct CPUArchState {
201 uint64_t ir[31];
202 float64 fir[31];
203 uint64_t pc;
204 uint64_t unique;
205 uint64_t lock_addr;
206 uint64_t lock_value;
207
208 /* The FPCR, and disassembled portions thereof. */
209 uint32_t fpcr;
210 #ifdef CONFIG_USER_ONLY
211 uint32_t swcr;
212 #endif
213 uint32_t fpcr_exc_enable;
214 float_status fp_status;
215 uint8_t fpcr_dyn_round;
216 uint8_t fpcr_flush_to_zero;
217
218 /* Mask of PALmode, Processor State et al. Most of this gets copied
219 into the TranslatorBlock flags and controls code generation. */
220 uint32_t flags;
221
222 /* The high 32-bits of the processor cycle counter. */
223 uint32_t pcc_ofs;
224
225 /* These pass data from the exception logic in the translator and
226 helpers to the OS entry point. This is used for both system
227 emulation and user-mode. */
228 uint64_t trap_arg0;
229 uint64_t trap_arg1;
230 uint64_t trap_arg2;
231
232 #if !defined(CONFIG_USER_ONLY)
233 /* The internal data required by our emulation of the Unix PALcode. */
234 uint64_t exc_addr;
235 uint64_t palbr;
236 uint64_t ptbr;
237 uint64_t vptptr;
238 uint64_t sysval;
239 uint64_t usp;
240 uint64_t shadow[8];
241 uint64_t scratch[24];
242 #endif
243
244 /* This alarm doesn't exist in real hardware; we wish it did. */
245 uint64_t alarm_expire;
246
247 int error_code;
248
249 uint32_t features;
250 uint32_t amask;
251 int implver;
252 } CPUAlphaState;
253
254 /**
255 * AlphaCPU:
256 * @env: #CPUAlphaState
257 *
258 * An Alpha CPU.
259 */
260 struct ArchCPU {
261 CPUState parent_obj;
262
263 CPUAlphaState env;
264
265 /* This alarm doesn't exist in real hardware; we wish it did. */
266 QEMUTimer *alarm_timer;
267 };
268
269 /**
270 * AlphaCPUClass:
271 * @parent_realize: The parent class' realize handler.
272 *
273 * An Alpha CPU model.
274 */
275 struct AlphaCPUClass {
276 CPUClass parent_class;
277
278 DeviceRealize parent_realize;
279 };
280
281 #ifndef CONFIG_USER_ONLY
282 extern const VMStateDescription vmstate_alpha_cpu;
283
284 void alpha_cpu_do_interrupt(CPUState *cpu);
285 bool alpha_cpu_exec_interrupt(CPUState *cpu, int int_req);
286 hwaddr alpha_cpu_get_phys_page_debug(CPUState *cpu, vaddr addr);
287 #endif /* !CONFIG_USER_ONLY */
288 void alpha_cpu_dump_state(CPUState *cs, FILE *f, int flags);
289 int alpha_cpu_gdb_read_register(CPUState *cpu, GByteArray *buf, int reg);
290 int alpha_cpu_gdb_write_register(CPUState *cpu, uint8_t *buf, int reg);
291
292 enum {
293 FEATURE_ASN = 0x00000001,
294 FEATURE_SPS = 0x00000002,
295 FEATURE_VIRBND = 0x00000004,
296 FEATURE_TBCHK = 0x00000008,
297 };
298
299 enum {
300 EXCP_RESET,
301 EXCP_MCHK,
302 EXCP_SMP_INTERRUPT,
303 EXCP_CLK_INTERRUPT,
304 EXCP_DEV_INTERRUPT,
305 EXCP_MMFAULT,
306 EXCP_UNALIGN,
307 EXCP_OPCDEC,
308 EXCP_ARITH,
309 EXCP_FEN,
310 EXCP_CALL_PAL,
311 };
312
313 /* Alpha-specific interrupt pending bits. */
314 #define CPU_INTERRUPT_TIMER CPU_INTERRUPT_TGT_EXT_0
315 #define CPU_INTERRUPT_SMP CPU_INTERRUPT_TGT_EXT_1
316 #define CPU_INTERRUPT_MCHK CPU_INTERRUPT_TGT_EXT_2
317
318 /* OSF/1 Page table bits. */
319 enum {
320 PTE_VALID = 0x0001,
321 PTE_FOR = 0x0002, /* used for page protection (fault on read) */
322 PTE_FOW = 0x0004, /* used for page protection (fault on write) */
323 PTE_FOE = 0x0008, /* used for page protection (fault on exec) */
324 PTE_ASM = 0x0010,
325 PTE_KRE = 0x0100,
326 PTE_URE = 0x0200,
327 PTE_KWE = 0x1000,
328 PTE_UWE = 0x2000
329 };
330
331 /* Hardware interrupt (entInt) constants. */
332 enum {
333 INT_K_IP,
334 INT_K_CLK,
335 INT_K_MCHK,
336 INT_K_DEV,
337 INT_K_PERF,
338 };
339
340 /* Memory management (entMM) constants. */
341 enum {
342 MM_K_TNV,
343 MM_K_ACV,
344 MM_K_FOR,
345 MM_K_FOE,
346 MM_K_FOW
347 };
348
349 /* Arithmetic exception (entArith) constants. */
350 enum {
351 EXC_M_SWC = 1, /* Software completion */
352 EXC_M_INV = 2, /* Invalid operation */
353 EXC_M_DZE = 4, /* Division by zero */
354 EXC_M_FOV = 8, /* Overflow */
355 EXC_M_UNF = 16, /* Underflow */
356 EXC_M_INE = 32, /* Inexact result */
357 EXC_M_IOV = 64 /* Integer Overflow */
358 };
359
360 /* Processor status constants. */
361 /* Low 3 bits are interrupt mask level. */
362 #define PS_INT_MASK 7u
363
364 /* Bits 4 and 5 are the mmu mode. The VMS PALcode uses all 4 modes;
365 The Unix PALcode only uses bit 4. */
366 #define PS_USER_MODE 8u
367
368 /* CPUAlphaState->flags constants. These are laid out so that we
369 can set or reset the pieces individually by assigning to the byte,
370 or manipulated as a whole. */
371
372 #define ENV_FLAG_PAL_SHIFT 0
373 #define ENV_FLAG_PS_SHIFT 8
374 #define ENV_FLAG_RX_SHIFT 16
375 #define ENV_FLAG_FEN_SHIFT 24
376
377 #define ENV_FLAG_PAL_MODE (1u << ENV_FLAG_PAL_SHIFT)
378 #define ENV_FLAG_PS_USER (PS_USER_MODE << ENV_FLAG_PS_SHIFT)
379 #define ENV_FLAG_RX_FLAG (1u << ENV_FLAG_RX_SHIFT)
380 #define ENV_FLAG_FEN (1u << ENV_FLAG_FEN_SHIFT)
381
382 #define ENV_FLAG_TB_MASK \
383 (ENV_FLAG_PAL_MODE | ENV_FLAG_PS_USER | ENV_FLAG_FEN)
384
385 #define TB_FLAG_UNALIGN (1u << 1)
386
alpha_env_mmu_index(CPUAlphaState * env)387 static inline int alpha_env_mmu_index(CPUAlphaState *env)
388 {
389 int ret = env->flags & ENV_FLAG_PS_USER ? MMU_USER_IDX : MMU_KERNEL_IDX;
390 if (env->flags & ENV_FLAG_PAL_MODE) {
391 ret = MMU_KERNEL_IDX;
392 }
393 return ret;
394 }
395
396 enum {
397 IR_V0 = 0,
398 IR_T0 = 1,
399 IR_T1 = 2,
400 IR_T2 = 3,
401 IR_T3 = 4,
402 IR_T4 = 5,
403 IR_T5 = 6,
404 IR_T6 = 7,
405 IR_T7 = 8,
406 IR_S0 = 9,
407 IR_S1 = 10,
408 IR_S2 = 11,
409 IR_S3 = 12,
410 IR_S4 = 13,
411 IR_S5 = 14,
412 IR_S6 = 15,
413 IR_FP = IR_S6,
414 IR_A0 = 16,
415 IR_A1 = 17,
416 IR_A2 = 18,
417 IR_A3 = 19,
418 IR_A4 = 20,
419 IR_A5 = 21,
420 IR_T8 = 22,
421 IR_T9 = 23,
422 IR_T10 = 24,
423 IR_T11 = 25,
424 IR_RA = 26,
425 IR_T12 = 27,
426 IR_PV = IR_T12,
427 IR_AT = 28,
428 IR_GP = 29,
429 IR_SP = 30,
430 IR_ZERO = 31,
431 };
432
433 void alpha_translate_init(void);
434 void alpha_translate_code(CPUState *cs, TranslationBlock *tb,
435 int *max_insns, vaddr pc, void *host_pc);
436
437 #define CPU_RESOLVING_TYPE TYPE_ALPHA_CPU
438
439 G_NORETURN void dynamic_excp(CPUAlphaState *, uintptr_t, int, int);
440 G_NORETURN void arith_excp(CPUAlphaState *, uintptr_t, int, uint64_t);
441
442 uint64_t cpu_alpha_load_fpcr (CPUAlphaState *env);
443 void cpu_alpha_store_fpcr (CPUAlphaState *env, uint64_t val);
444 uint64_t cpu_alpha_load_gr(CPUAlphaState *env, unsigned reg);
445 void cpu_alpha_store_gr(CPUAlphaState *env, unsigned reg, uint64_t val);
446
447 #ifdef CONFIG_USER_ONLY
448 void alpha_cpu_record_sigsegv(CPUState *cs, vaddr address,
449 MMUAccessType access_type,
450 bool maperr, uintptr_t retaddr);
451 void alpha_cpu_record_sigbus(CPUState *cs, vaddr address,
452 MMUAccessType access_type, uintptr_t retaddr);
453 #else
454 bool alpha_cpu_tlb_fill(CPUState *cs, vaddr address, int size,
455 MMUAccessType access_type, int mmu_idx,
456 bool probe, uintptr_t retaddr);
457 G_NORETURN void alpha_cpu_do_unaligned_access(CPUState *cpu, vaddr addr,
458 MMUAccessType access_type, int mmu_idx,
459 uintptr_t retaddr);
460 void alpha_cpu_do_transaction_failed(CPUState *cs, hwaddr physaddr,
461 vaddr addr, unsigned size,
462 MMUAccessType access_type,
463 int mmu_idx, MemTxAttrs attrs,
464 MemTxResult response, uintptr_t retaddr);
465 #endif
466
467 #ifdef CONFIG_USER_ONLY
468 /* Copied from linux ieee_swcr_to_fpcr. */
alpha_ieee_swcr_to_fpcr(uint64_t swcr)469 static inline uint64_t alpha_ieee_swcr_to_fpcr(uint64_t swcr)
470 {
471 uint64_t fpcr = 0;
472
473 fpcr |= (swcr & SWCR_STATUS_MASK) << 35;
474 fpcr |= (swcr & SWCR_MAP_DMZ) << 36;
475 fpcr |= (~swcr & (SWCR_TRAP_ENABLE_INV
476 | SWCR_TRAP_ENABLE_DZE
477 | SWCR_TRAP_ENABLE_OVF)) << 48;
478 fpcr |= (~swcr & (SWCR_TRAP_ENABLE_UNF
479 | SWCR_TRAP_ENABLE_INE)) << 57;
480 fpcr |= (swcr & SWCR_MAP_UMZ ? FPCR_UNDZ | FPCR_UNFD : 0);
481 fpcr |= (~swcr & SWCR_TRAP_ENABLE_DNO) << 41;
482
483 return fpcr;
484 }
485
486 /* Copied from linux ieee_fpcr_to_swcr. */
alpha_ieee_fpcr_to_swcr(uint64_t fpcr)487 static inline uint64_t alpha_ieee_fpcr_to_swcr(uint64_t fpcr)
488 {
489 uint64_t swcr = 0;
490
491 swcr |= (fpcr >> 35) & SWCR_STATUS_MASK;
492 swcr |= (fpcr >> 36) & SWCR_MAP_DMZ;
493 swcr |= (~fpcr >> 48) & (SWCR_TRAP_ENABLE_INV
494 | SWCR_TRAP_ENABLE_DZE
495 | SWCR_TRAP_ENABLE_OVF);
496 swcr |= (~fpcr >> 57) & (SWCR_TRAP_ENABLE_UNF | SWCR_TRAP_ENABLE_INE);
497 swcr |= (fpcr >> 47) & SWCR_MAP_UMZ;
498 swcr |= (~fpcr >> 41) & SWCR_TRAP_ENABLE_DNO;
499
500 return swcr;
501 }
502 #endif /* CONFIG_USER_ONLY */
503
504 #endif /* ALPHA_CPU_H */
505