2 * Copyright (c) 2011, Max Filippov, Open Source and Linux Lab.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 * * Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * * Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 * * Neither the name of the Open Source and Linux Lab nor the
13 * names of its contributors may be used to endorse or promote products
14 * derived from this software without specific prior written permission.
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
20 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
21 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
22 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
23 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
25 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 #include "exec/exec-all.h"
30 #include "exec/gdbstub.h"
31 #include "qemu/host-utils.h"
32 #if !defined(CONFIG_USER_ONLY)
33 #include "hw/loader.h"
36 static struct XtensaConfigList *xtensa_cores;
38 static void xtensa_core_class_init(ObjectClass *oc, void *data)
40 CPUClass *cc = CPU_CLASS(oc);
41 XtensaCPUClass *xcc = XTENSA_CPU_CLASS(oc);
42 const XtensaConfig *config = data;
46 /* Use num_core_regs to see only non-privileged registers in an unmodified
47 * gdb. Use num_regs to see all registers. gdb modification is required
48 * for that: reset bit 0 in the 'flags' field of the registers definitions
49 * in the gdb/xtensa-config.c inside gdb source tree or inside gdb overlay.
51 cc->gdb_num_core_regs = config->gdb_regmap.num_regs;
54 void xtensa_register_core(XtensaConfigList *node)
57 .parent = TYPE_XTENSA_CPU,
58 .class_init = xtensa_core_class_init,
59 .class_data = (void *)node->config,
62 node->next = xtensa_cores;
64 type.name = g_strdup_printf("%s-" TYPE_XTENSA_CPU, node->config->name);
66 g_free((gpointer)type.name);
69 static uint32_t check_hw_breakpoints(CPUXtensaState *env)
73 for (i = 0; i < env->config->ndbreak; ++i) {
74 if (env->cpu_watchpoint[i] &&
75 env->cpu_watchpoint[i]->flags & BP_WATCHPOINT_HIT) {
76 return DEBUGCAUSE_DB | (i << DEBUGCAUSE_DBNUM_SHIFT);
82 void xtensa_breakpoint_handler(CPUXtensaState *env)
84 if (env->watchpoint_hit) {
85 if (env->watchpoint_hit->flags & BP_CPU) {
88 env->watchpoint_hit = NULL;
89 cause = check_hw_breakpoints(env);
91 debug_exception_env(env, cause);
93 cpu_resume_from_signal(env, NULL);
98 XtensaCPU *cpu_xtensa_init(const char *cpu_model)
104 oc = cpu_class_by_name(TYPE_XTENSA_CPU, cpu_model);
109 cpu = XTENSA_CPU(object_new(object_class_get_name(oc)));
112 xtensa_irq_init(env);
114 object_property_set_bool(OBJECT(cpu), true, "realized", NULL);
120 void xtensa_cpu_list(FILE *f, fprintf_function cpu_fprintf)
122 XtensaConfigList *core = xtensa_cores;
123 cpu_fprintf(f, "Available CPUs:\n");
124 for (; core; core = core->next) {
125 cpu_fprintf(f, " %s\n", core->config->name);
129 hwaddr xtensa_cpu_get_phys_page_debug(CPUState *cs, vaddr addr)
131 XtensaCPU *cpu = XTENSA_CPU(cs);
136 if (xtensa_get_physical_addr(&cpu->env, false, addr, 0, 0,
137 &paddr, &page_size, &access) == 0) {
140 if (xtensa_get_physical_addr(&cpu->env, false, addr, 2, 0,
141 &paddr, &page_size, &access) == 0) {
147 static uint32_t relocated_vector(CPUXtensaState *env, uint32_t vector)
149 if (xtensa_option_enabled(env->config,
150 XTENSA_OPTION_RELOCATABLE_VECTOR)) {
151 return vector - env->config->vecbase + env->sregs[VECBASE];
158 * Handle penging IRQ.
159 * For the high priority interrupt jump to the corresponding interrupt vector.
160 * For the level-1 interrupt convert it to either user, kernel or double
161 * exception with the 'level-1 interrupt' exception cause.
163 static void handle_interrupt(CPUXtensaState *env)
165 int level = env->pending_irq_level;
167 if (level > xtensa_get_cintlevel(env) &&
168 level <= env->config->nlevel &&
169 (env->config->level_mask[level] &
171 env->sregs[INTENABLE])) {
173 env->sregs[EPC1 + level - 1] = env->pc;
174 env->sregs[EPS2 + level - 2] = env->sregs[PS];
176 (env->sregs[PS] & ~PS_INTLEVEL) | level | PS_EXCM;
177 env->pc = relocated_vector(env,
178 env->config->interrupt_vector[level]);
180 env->sregs[EXCCAUSE] = LEVEL1_INTERRUPT_CAUSE;
182 if (env->sregs[PS] & PS_EXCM) {
183 if (env->config->ndepc) {
184 env->sregs[DEPC] = env->pc;
186 env->sregs[EPC1] = env->pc;
188 env->exception_index = EXC_DOUBLE;
190 env->sregs[EPC1] = env->pc;
191 env->exception_index =
192 (env->sregs[PS] & PS_UM) ? EXC_USER : EXC_KERNEL;
194 env->sregs[PS] |= PS_EXCM;
196 env->exception_taken = 1;
200 void xtensa_cpu_do_interrupt(CPUState *cs)
202 XtensaCPU *cpu = XTENSA_CPU(cs);
203 CPUXtensaState *env = &cpu->env;
205 if (env->exception_index == EXC_IRQ) {
206 qemu_log_mask(CPU_LOG_INT,
207 "%s(EXC_IRQ) level = %d, cintlevel = %d, "
208 "pc = %08x, a0 = %08x, ps = %08x, "
209 "intset = %08x, intenable = %08x, "
211 __func__, env->pending_irq_level, xtensa_get_cintlevel(env),
212 env->pc, env->regs[0], env->sregs[PS],
213 env->sregs[INTSET], env->sregs[INTENABLE],
215 handle_interrupt(env);
218 switch (env->exception_index) {
219 case EXC_WINDOW_OVERFLOW4:
220 case EXC_WINDOW_UNDERFLOW4:
221 case EXC_WINDOW_OVERFLOW8:
222 case EXC_WINDOW_UNDERFLOW8:
223 case EXC_WINDOW_OVERFLOW12:
224 case EXC_WINDOW_UNDERFLOW12:
229 qemu_log_mask(CPU_LOG_INT, "%s(%d) "
230 "pc = %08x, a0 = %08x, ps = %08x, ccount = %08x\n",
231 __func__, env->exception_index,
232 env->pc, env->regs[0], env->sregs[PS], env->sregs[CCOUNT]);
233 if (env->config->exception_vector[env->exception_index]) {
234 env->pc = relocated_vector(env,
235 env->config->exception_vector[env->exception_index]);
236 env->exception_taken = 1;
238 qemu_log("%s(pc = %08x) bad exception_index: %d\n",
239 __func__, env->pc, env->exception_index);
247 qemu_log("%s(pc = %08x) unknown exception_index: %d\n",
248 __func__, env->pc, env->exception_index);
251 check_interrupts(env);
254 static void reset_tlb_mmu_all_ways(CPUXtensaState *env,
255 const xtensa_tlb *tlb, xtensa_tlb_entry entry[][MAX_TLB_WAY_SIZE])
259 for (wi = 0; wi < tlb->nways; ++wi) {
260 for (ei = 0; ei < tlb->way_size[wi]; ++ei) {
261 entry[wi][ei].asid = 0;
262 entry[wi][ei].variable = true;
267 static void reset_tlb_mmu_ways56(CPUXtensaState *env,
268 const xtensa_tlb *tlb, xtensa_tlb_entry entry[][MAX_TLB_WAY_SIZE])
270 if (!tlb->varway56) {
271 static const xtensa_tlb_entry way5[] = {
286 static const xtensa_tlb_entry way6[] = {
301 memcpy(entry[5], way5, sizeof(way5));
302 memcpy(entry[6], way6, sizeof(way6));
305 for (ei = 0; ei < 8; ++ei) {
306 entry[6][ei].vaddr = ei << 29;
307 entry[6][ei].paddr = ei << 29;
308 entry[6][ei].asid = 1;
309 entry[6][ei].attr = 3;
314 static void reset_tlb_region_way0(CPUXtensaState *env,
315 xtensa_tlb_entry entry[][MAX_TLB_WAY_SIZE])
319 for (ei = 0; ei < 8; ++ei) {
320 entry[0][ei].vaddr = ei << 29;
321 entry[0][ei].paddr = ei << 29;
322 entry[0][ei].asid = 1;
323 entry[0][ei].attr = 2;
324 entry[0][ei].variable = true;
328 void reset_mmu(CPUXtensaState *env)
330 if (xtensa_option_enabled(env->config, XTENSA_OPTION_MMU)) {
331 env->sregs[RASID] = 0x04030201;
332 env->sregs[ITLBCFG] = 0;
333 env->sregs[DTLBCFG] = 0;
334 env->autorefill_idx = 0;
335 reset_tlb_mmu_all_ways(env, &env->config->itlb, env->itlb);
336 reset_tlb_mmu_all_ways(env, &env->config->dtlb, env->dtlb);
337 reset_tlb_mmu_ways56(env, &env->config->itlb, env->itlb);
338 reset_tlb_mmu_ways56(env, &env->config->dtlb, env->dtlb);
340 reset_tlb_region_way0(env, env->itlb);
341 reset_tlb_region_way0(env, env->dtlb);
345 static unsigned get_ring(const CPUXtensaState *env, uint8_t asid)
348 for (i = 0; i < 4; ++i) {
349 if (((env->sregs[RASID] >> i * 8) & 0xff) == asid) {
357 * Lookup xtensa TLB for the given virtual address.
360 * \param pwi: [out] way index
361 * \param pei: [out] entry index
362 * \param pring: [out] access ring
363 * \return 0 if ok, exception cause code otherwise
365 int xtensa_tlb_lookup(const CPUXtensaState *env, uint32_t addr, bool dtlb,
366 uint32_t *pwi, uint32_t *pei, uint8_t *pring)
368 const xtensa_tlb *tlb = dtlb ?
369 &env->config->dtlb : &env->config->itlb;
370 const xtensa_tlb_entry (*entry)[MAX_TLB_WAY_SIZE] = dtlb ?
371 env->dtlb : env->itlb;
376 for (wi = 0; wi < tlb->nways; ++wi) {
379 split_tlb_entry_spec_way(env, addr, dtlb, &vpn, wi, &ei);
380 if (entry[wi][ei].vaddr == vpn && entry[wi][ei].asid) {
381 unsigned ring = get_ring(env, entry[wi][ei].asid);
385 LOAD_STORE_TLB_MULTI_HIT_CAUSE :
386 INST_TLB_MULTI_HIT_CAUSE;
395 (dtlb ? LOAD_STORE_TLB_MISS_CAUSE : INST_TLB_MISS_CAUSE);
399 * Convert MMU ATTR to PAGE_{READ,WRITE,EXEC} mask.
402 static unsigned mmu_attr_to_access(uint32_t attr)
412 access |= PAGE_WRITE;
415 switch (attr & 0xc) {
417 access |= PAGE_CACHE_BYPASS;
421 access |= PAGE_CACHE_WB;
425 access |= PAGE_CACHE_WT;
428 } else if (attr == 13) {
429 access |= PAGE_READ | PAGE_WRITE | PAGE_CACHE_ISOLATE;
435 * Convert region protection ATTR to PAGE_{READ,WRITE,EXEC} mask.
438 static unsigned region_attr_to_access(uint32_t attr)
440 static const unsigned access[16] = {
441 [0] = PAGE_READ | PAGE_WRITE | PAGE_CACHE_WT,
442 [1] = PAGE_READ | PAGE_WRITE | PAGE_EXEC | PAGE_CACHE_WT,
443 [2] = PAGE_READ | PAGE_WRITE | PAGE_EXEC | PAGE_CACHE_BYPASS,
444 [3] = PAGE_EXEC | PAGE_CACHE_WB,
445 [4] = PAGE_READ | PAGE_WRITE | PAGE_EXEC | PAGE_CACHE_WB,
446 [5] = PAGE_READ | PAGE_WRITE | PAGE_EXEC | PAGE_CACHE_WB,
447 [14] = PAGE_READ | PAGE_WRITE | PAGE_CACHE_ISOLATE,
450 return access[attr & 0xf];
454 * Convert cacheattr to PAGE_{READ,WRITE,EXEC} mask.
455 * See ISA, A.2.14 The Cache Attribute Register
457 static unsigned cacheattr_attr_to_access(uint32_t attr)
459 static const unsigned access[16] = {
460 [0] = PAGE_READ | PAGE_WRITE | PAGE_CACHE_WT,
461 [1] = PAGE_READ | PAGE_WRITE | PAGE_EXEC | PAGE_CACHE_WT,
462 [2] = PAGE_READ | PAGE_WRITE | PAGE_EXEC | PAGE_CACHE_BYPASS,
463 [3] = PAGE_EXEC | PAGE_CACHE_WB,
464 [4] = PAGE_READ | PAGE_WRITE | PAGE_EXEC | PAGE_CACHE_WB,
465 [14] = PAGE_READ | PAGE_WRITE | PAGE_CACHE_ISOLATE,
468 return access[attr & 0xf];
471 static bool is_access_granted(unsigned access, int is_write)
475 return access & PAGE_READ;
478 return access & PAGE_WRITE;
481 return access & PAGE_EXEC;
488 static int get_pte(CPUXtensaState *env, uint32_t vaddr, uint32_t *pte);
490 static int get_physical_addr_mmu(CPUXtensaState *env, bool update_tlb,
491 uint32_t vaddr, int is_write, int mmu_idx,
492 uint32_t *paddr, uint32_t *page_size, unsigned *access,
495 bool dtlb = is_write != 2;
501 const xtensa_tlb_entry *entry = NULL;
502 xtensa_tlb_entry tmp_entry;
503 int ret = xtensa_tlb_lookup(env, vaddr, dtlb, &wi, &ei, &ring);
505 if ((ret == INST_TLB_MISS_CAUSE || ret == LOAD_STORE_TLB_MISS_CAUSE) &&
506 may_lookup_pt && get_pte(env, vaddr, &pte) == 0) {
507 ring = (pte >> 4) & 0x3;
509 split_tlb_entry_spec_way(env, vaddr, dtlb, &vpn, wi, &ei);
512 wi = ++env->autorefill_idx & 0x3;
513 xtensa_tlb_set_entry(env, dtlb, wi, ei, vpn, pte);
514 env->sregs[EXCVADDR] = vaddr;
515 qemu_log("%s: autorefill(%08x): %08x -> %08x\n",
516 __func__, vaddr, vpn, pte);
518 xtensa_tlb_set_entry_mmu(env, &tmp_entry, dtlb, wi, ei, vpn, pte);
528 entry = xtensa_tlb_get_entry(env, dtlb, wi, ei);
531 if (ring < mmu_idx) {
533 LOAD_STORE_PRIVILEGE_CAUSE :
534 INST_FETCH_PRIVILEGE_CAUSE;
537 *access = mmu_attr_to_access(entry->attr) &
538 ~(dtlb ? PAGE_EXEC : PAGE_READ | PAGE_WRITE);
539 if (!is_access_granted(*access, is_write)) {
542 STORE_PROHIBITED_CAUSE :
543 LOAD_PROHIBITED_CAUSE) :
544 INST_FETCH_PROHIBITED_CAUSE;
547 *paddr = entry->paddr | (vaddr & ~xtensa_tlb_get_addr_mask(env, dtlb, wi));
548 *page_size = ~xtensa_tlb_get_addr_mask(env, dtlb, wi) + 1;
553 static int get_pte(CPUXtensaState *env, uint32_t vaddr, uint32_t *pte)
555 CPUState *cs = ENV_GET_CPU(env);
560 (env->sregs[PTEVADDR] | (vaddr >> 10)) & 0xfffffffc;
561 int ret = get_physical_addr_mmu(env, false, pt_vaddr, 0, 0,
562 &paddr, &page_size, &access, false);
564 qemu_log("%s: trying autorefill(%08x) -> %08x\n", __func__,
565 vaddr, ret ? ~0 : paddr);
568 *pte = ldl_phys(cs->as, paddr);
573 static int get_physical_addr_region(CPUXtensaState *env,
574 uint32_t vaddr, int is_write, int mmu_idx,
575 uint32_t *paddr, uint32_t *page_size, unsigned *access)
577 bool dtlb = is_write != 2;
579 uint32_t ei = (vaddr >> 29) & 0x7;
580 const xtensa_tlb_entry *entry =
581 xtensa_tlb_get_entry(env, dtlb, wi, ei);
583 *access = region_attr_to_access(entry->attr);
584 if (!is_access_granted(*access, is_write)) {
587 STORE_PROHIBITED_CAUSE :
588 LOAD_PROHIBITED_CAUSE) :
589 INST_FETCH_PROHIBITED_CAUSE;
592 *paddr = entry->paddr | (vaddr & ~REGION_PAGE_MASK);
593 *page_size = ~REGION_PAGE_MASK + 1;
599 * Convert virtual address to physical addr.
600 * MMU may issue pagewalk and change xtensa autorefill TLB way entry.
602 * \return 0 if ok, exception cause code otherwise
604 int xtensa_get_physical_addr(CPUXtensaState *env, bool update_tlb,
605 uint32_t vaddr, int is_write, int mmu_idx,
606 uint32_t *paddr, uint32_t *page_size, unsigned *access)
608 if (xtensa_option_enabled(env->config, XTENSA_OPTION_MMU)) {
609 return get_physical_addr_mmu(env, update_tlb,
610 vaddr, is_write, mmu_idx, paddr, page_size, access, true);
611 } else if (xtensa_option_bits_enabled(env->config,
612 XTENSA_OPTION_BIT(XTENSA_OPTION_REGION_PROTECTION) |
613 XTENSA_OPTION_BIT(XTENSA_OPTION_REGION_TRANSLATION))) {
614 return get_physical_addr_region(env, vaddr, is_write, mmu_idx,
615 paddr, page_size, access);
618 *page_size = TARGET_PAGE_SIZE;
619 *access = cacheattr_attr_to_access(
620 env->sregs[CACHEATTR] >> ((vaddr & 0xe0000000) >> 27));
625 static void dump_tlb(FILE *f, fprintf_function cpu_fprintf,
626 CPUXtensaState *env, bool dtlb)
629 const xtensa_tlb *conf =
630 dtlb ? &env->config->dtlb : &env->config->itlb;
631 unsigned (*attr_to_access)(uint32_t) =
632 xtensa_option_enabled(env->config, XTENSA_OPTION_MMU) ?
633 mmu_attr_to_access : region_attr_to_access;
635 for (wi = 0; wi < conf->nways; ++wi) {
636 uint32_t sz = ~xtensa_tlb_get_addr_mask(env, dtlb, wi) + 1;
638 bool print_header = true;
640 if (sz >= 0x100000) {
648 for (ei = 0; ei < conf->way_size[wi]; ++ei) {
649 const xtensa_tlb_entry *entry =
650 xtensa_tlb_get_entry(env, dtlb, wi, ei);
653 static const char * const cache_text[8] = {
654 [PAGE_CACHE_BYPASS >> PAGE_CACHE_SHIFT] = "Bypass",
655 [PAGE_CACHE_WT >> PAGE_CACHE_SHIFT] = "WT",
656 [PAGE_CACHE_WB >> PAGE_CACHE_SHIFT] = "WB",
657 [PAGE_CACHE_ISOLATE >> PAGE_CACHE_SHIFT] = "Isolate",
659 unsigned access = attr_to_access(entry->attr);
660 unsigned cache_idx = (access & PAGE_CACHE_MASK) >>
664 print_header = false;
665 cpu_fprintf(f, "Way %u (%d %s)\n", wi, sz, sz_text);
667 "\tVaddr Paddr ASID Attr RWX Cache\n"
668 "\t---------- ---------- ---- ---- --- -------\n");
671 "\t0x%08x 0x%08x 0x%02x 0x%02x %c%c%c %-7s\n",
676 (access & PAGE_READ) ? 'R' : '-',
677 (access & PAGE_WRITE) ? 'W' : '-',
678 (access & PAGE_EXEC) ? 'X' : '-',
679 cache_text[cache_idx] ? cache_text[cache_idx] :
686 void dump_mmu(FILE *f, fprintf_function cpu_fprintf, CPUXtensaState *env)
688 if (xtensa_option_bits_enabled(env->config,
689 XTENSA_OPTION_BIT(XTENSA_OPTION_REGION_PROTECTION) |
690 XTENSA_OPTION_BIT(XTENSA_OPTION_REGION_TRANSLATION) |
691 XTENSA_OPTION_BIT(XTENSA_OPTION_MMU))) {
693 cpu_fprintf(f, "ITLB:\n");
694 dump_tlb(f, cpu_fprintf, env, false);
695 cpu_fprintf(f, "\nDTLB:\n");
696 dump_tlb(f, cpu_fprintf, env, true);
698 cpu_fprintf(f, "No TLB for this CPU core\n");