2 * MIPS emulation helpers for qemu.
4 * Copyright (c) 2004-2005 Jocelyn Mayer
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 of the License, or (at your option) any later version.
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.
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/>.
36 #if !defined(CONFIG_USER_ONLY)
38 /* no MMU emulation */
39 int no_mmu_map_address (CPUMIPSState *env, hwaddr *physical, int *prot,
40 target_ulong address, int rw, int access_type)
43 *prot = PAGE_READ | PAGE_WRITE;
47 /* fixed mapping MMU emulation */
48 int fixed_mmu_map_address (CPUMIPSState *env, hwaddr *physical, int *prot,
49 target_ulong address, int rw, int access_type)
51 if (address <= (int32_t)0x7FFFFFFFUL) {
52 if (!(env->CP0_Status & (1 << CP0St_ERL)))
53 *physical = address + 0x40000000UL;
56 } else if (address <= (int32_t)0xBFFFFFFFUL)
57 *physical = address & 0x1FFFFFFF;
61 *prot = PAGE_READ | PAGE_WRITE;
65 /* MIPS32/MIPS64 R4000-style MMU emulation */
66 int r4k_map_address (CPUMIPSState *env, hwaddr *physical, int *prot,
67 target_ulong address, int rw, int access_type)
69 uint8_t ASID = env->CP0_EntryHi & 0xFF;
72 for (i = 0; i < env->tlb->tlb_in_use; i++) {
73 r4k_tlb_t *tlb = &env->tlb->mmu.r4k.tlb[i];
74 /* 1k pages are not supported. */
75 target_ulong mask = tlb->PageMask | ~(TARGET_PAGE_MASK << 1);
76 target_ulong tag = address & ~mask;
77 target_ulong VPN = tlb->VPN & ~mask;
78 #if defined(TARGET_MIPS64)
82 /* Check ASID, virtual page number & size */
83 if ((tlb->G == 1 || tlb->ASID == ASID) && VPN == tag) {
85 int n = !!(address & mask & ~(mask >> 1));
86 /* Check access rights */
87 if (!(n ? tlb->V1 : tlb->V0))
88 return TLBRET_INVALID;
89 if (rw == 0 || (n ? tlb->D1 : tlb->D0)) {
90 *physical = tlb->PFN[n] | (address & (mask >> 1));
92 if (n ? tlb->D1 : tlb->D0)
99 return TLBRET_NOMATCH;
102 static int get_physical_address (CPUMIPSState *env, hwaddr *physical,
103 int *prot, target_ulong address,
104 int rw, int access_type)
106 /* User mode can only access useg/xuseg */
107 int user_mode = (env->hflags & MIPS_HFLAG_MODE) == MIPS_HFLAG_UM;
108 int supervisor_mode = (env->hflags & MIPS_HFLAG_MODE) == MIPS_HFLAG_SM;
109 int kernel_mode = !user_mode && !supervisor_mode;
110 #if defined(TARGET_MIPS64)
111 int UX = (env->CP0_Status & (1 << CP0St_UX)) != 0;
112 int SX = (env->CP0_Status & (1 << CP0St_SX)) != 0;
113 int KX = (env->CP0_Status & (1 << CP0St_KX)) != 0;
115 int ret = TLBRET_MATCH;
118 qemu_log("user mode %d h %08x\n", user_mode, env->hflags);
121 if (address <= (int32_t)0x7FFFFFFFUL) {
123 if (env->CP0_Status & (1 << CP0St_ERL)) {
124 *physical = address & 0xFFFFFFFF;
125 *prot = PAGE_READ | PAGE_WRITE;
127 ret = env->tlb->map_address(env, physical, prot, address, rw, access_type);
129 #if defined(TARGET_MIPS64)
130 } else if (address < 0x4000000000000000ULL) {
132 if (UX && address <= (0x3FFFFFFFFFFFFFFFULL & env->SEGMask)) {
133 ret = env->tlb->map_address(env, physical, prot, address, rw, access_type);
135 ret = TLBRET_BADADDR;
137 } else if (address < 0x8000000000000000ULL) {
139 if ((supervisor_mode || kernel_mode) &&
140 SX && address <= (0x7FFFFFFFFFFFFFFFULL & env->SEGMask)) {
141 ret = env->tlb->map_address(env, physical, prot, address, rw, access_type);
143 ret = TLBRET_BADADDR;
145 } else if (address < 0xC000000000000000ULL) {
147 if (kernel_mode && KX &&
148 (address & 0x07FFFFFFFFFFFFFFULL) <= env->PAMask) {
149 *physical = address & env->PAMask;
150 *prot = PAGE_READ | PAGE_WRITE;
152 ret = TLBRET_BADADDR;
154 } else if (address < 0xFFFFFFFF80000000ULL) {
156 if (kernel_mode && KX &&
157 address <= (0xFFFFFFFF7FFFFFFFULL & env->SEGMask)) {
158 ret = env->tlb->map_address(env, physical, prot, address, rw, access_type);
160 ret = TLBRET_BADADDR;
163 } else if (address < (int32_t)0xA0000000UL) {
166 *physical = address - (int32_t)0x80000000UL;
167 *prot = PAGE_READ | PAGE_WRITE;
169 ret = TLBRET_BADADDR;
171 } else if (address < (int32_t)0xC0000000UL) {
174 *physical = address - (int32_t)0xA0000000UL;
175 *prot = PAGE_READ | PAGE_WRITE;
177 ret = TLBRET_BADADDR;
179 } else if (address < (int32_t)0xE0000000UL) {
181 if (supervisor_mode || kernel_mode) {
182 ret = env->tlb->map_address(env, physical, prot, address, rw, access_type);
184 ret = TLBRET_BADADDR;
188 /* XXX: debug segment is not emulated */
190 ret = env->tlb->map_address(env, physical, prot, address, rw, access_type);
192 ret = TLBRET_BADADDR;
196 qemu_log(TARGET_FMT_lx " %d %d => " TARGET_FMT_lx " %d (%d)\n",
197 address, rw, access_type, *physical, *prot, ret);
204 static void raise_mmu_exception(CPUMIPSState *env, target_ulong address,
205 int rw, int tlb_error)
207 int exception = 0, error_code = 0;
212 /* Reference to kernel address from user mode or supervisor mode */
213 /* Reference to supervisor address from user mode */
215 exception = EXCP_AdES;
217 exception = EXCP_AdEL;
220 /* No TLB match for a mapped address */
222 exception = EXCP_TLBS;
224 exception = EXCP_TLBL;
228 /* TLB match with no valid bit */
230 exception = EXCP_TLBS;
232 exception = EXCP_TLBL;
235 /* TLB match but 'D' bit is cleared */
236 exception = EXCP_LTLBL;
240 /* Raise exception */
241 env->CP0_BadVAddr = address;
242 env->CP0_Context = (env->CP0_Context & ~0x007fffff) |
243 ((address >> 9) & 0x007ffff0);
245 (env->CP0_EntryHi & 0xFF) | (address & (TARGET_PAGE_MASK << 1));
246 #if defined(TARGET_MIPS64)
247 env->CP0_EntryHi &= env->SEGMask;
248 env->CP0_XContext = (env->CP0_XContext & ((~0ULL) << (env->SEGBITS - 7))) |
249 ((address & 0xC00000000000ULL) >> (55 - env->SEGBITS)) |
250 ((address & ((1ULL << env->SEGBITS) - 1) & 0xFFFFFFFFFFFFE000ULL) >> 9);
252 env->exception_index = exception;
253 env->error_code = error_code;
256 #if !defined(CONFIG_USER_ONLY)
257 hwaddr cpu_get_phys_page_debug(CPUMIPSState *env, target_ulong addr)
262 if (get_physical_address(env, &phys_addr, &prot, addr, 0, ACCESS_INT) != 0)
268 int cpu_mips_handle_mmu_fault (CPUMIPSState *env, target_ulong address, int rw,
271 #if !defined(CONFIG_USER_ONLY)
279 log_cpu_state(env, 0);
281 qemu_log("%s pc " TARGET_FMT_lx " ad " TARGET_FMT_lx " rw %d mmu_idx %d\n",
282 __func__, env->active_tc.PC, address, rw, mmu_idx);
287 #if !defined(CONFIG_USER_ONLY)
288 /* XXX: put correct access by using cpu_restore_state()
290 access_type = ACCESS_INT;
291 ret = get_physical_address(env, &physical, &prot,
292 address, rw, access_type);
293 qemu_log("%s address=" TARGET_FMT_lx " ret %d physical " TARGET_FMT_plx " prot %d\n",
294 __func__, address, ret, physical, prot);
295 if (ret == TLBRET_MATCH) {
296 tlb_set_page(env, address & TARGET_PAGE_MASK,
297 physical & TARGET_PAGE_MASK, prot | PAGE_EXEC,
298 mmu_idx, TARGET_PAGE_SIZE);
303 raise_mmu_exception(env, address, rw, ret);
310 #if !defined(CONFIG_USER_ONLY)
311 hwaddr cpu_mips_translate_address(CPUMIPSState *env, target_ulong address, int rw)
321 access_type = ACCESS_INT;
322 ret = get_physical_address(env, &physical, &prot,
323 address, rw, access_type);
324 if (ret != TLBRET_MATCH) {
325 raise_mmu_exception(env, address, rw, ret);
333 static const char * const excp_names[EXCP_LAST + 1] = {
334 [EXCP_RESET] = "reset",
335 [EXCP_SRESET] = "soft reset",
336 [EXCP_DSS] = "debug single step",
337 [EXCP_DINT] = "debug interrupt",
338 [EXCP_NMI] = "non-maskable interrupt",
339 [EXCP_MCHECK] = "machine check",
340 [EXCP_EXT_INTERRUPT] = "interrupt",
341 [EXCP_DFWATCH] = "deferred watchpoint",
342 [EXCP_DIB] = "debug instruction breakpoint",
343 [EXCP_IWATCH] = "instruction fetch watchpoint",
344 [EXCP_AdEL] = "address error load",
345 [EXCP_AdES] = "address error store",
346 [EXCP_TLBF] = "TLB refill",
347 [EXCP_IBE] = "instruction bus error",
348 [EXCP_DBp] = "debug breakpoint",
349 [EXCP_SYSCALL] = "syscall",
350 [EXCP_BREAK] = "break",
351 [EXCP_CpU] = "coprocessor unusable",
352 [EXCP_RI] = "reserved instruction",
353 [EXCP_OVERFLOW] = "arithmetic overflow",
354 [EXCP_TRAP] = "trap",
355 [EXCP_FPE] = "floating point",
356 [EXCP_DDBS] = "debug data break store",
357 [EXCP_DWATCH] = "data watchpoint",
358 [EXCP_LTLBL] = "TLB modify",
359 [EXCP_TLBL] = "TLB load",
360 [EXCP_TLBS] = "TLB store",
361 [EXCP_DBE] = "data bus error",
362 [EXCP_DDBL] = "debug data break load",
363 [EXCP_THREAD] = "thread",
364 [EXCP_MDMX] = "MDMX",
365 [EXCP_C2E] = "precise coprocessor 2",
366 [EXCP_CACHE] = "cache error",
369 #if !defined(CONFIG_USER_ONLY)
370 static target_ulong exception_resume_pc (CPUMIPSState *env)
373 target_ulong isa_mode;
375 isa_mode = !!(env->hflags & MIPS_HFLAG_M16);
376 bad_pc = env->active_tc.PC | isa_mode;
377 if (env->hflags & MIPS_HFLAG_BMASK) {
378 /* If the exception was raised from a delay slot, come back to
380 bad_pc -= (env->hflags & MIPS_HFLAG_B16 ? 2 : 4);
386 static void set_hflags_for_handler (CPUMIPSState *env)
388 /* Exception handlers are entered in 32-bit mode. */
389 env->hflags &= ~(MIPS_HFLAG_M16);
390 /* ...except that microMIPS lets you choose. */
391 if (env->insn_flags & ASE_MICROMIPS) {
392 env->hflags |= (!!(env->CP0_Config3
393 & (1 << CP0C3_ISA_ON_EXC))
394 << MIPS_HFLAG_M16_SHIFT);
399 void mips_cpu_do_interrupt(CPUState *cs)
401 MIPSCPU *cpu = MIPS_CPU(cs);
402 CPUMIPSState *env = &cpu->env;
403 #if !defined(CONFIG_USER_ONLY)
408 if (qemu_log_enabled() && env->exception_index != EXCP_EXT_INTERRUPT) {
409 if (env->exception_index < 0 || env->exception_index > EXCP_LAST)
412 name = excp_names[env->exception_index];
414 qemu_log("%s enter: PC " TARGET_FMT_lx " EPC " TARGET_FMT_lx " %s exception\n",
415 __func__, env->active_tc.PC, env->CP0_EPC, name);
417 if (env->exception_index == EXCP_EXT_INTERRUPT &&
418 (env->hflags & MIPS_HFLAG_DM))
419 env->exception_index = EXCP_DINT;
421 switch (env->exception_index) {
423 env->CP0_Debug |= 1 << CP0DB_DSS;
424 /* Debug single step cannot be raised inside a delay slot and
425 resume will always occur on the next instruction
426 (but we assume the pc has always been updated during
427 code translation). */
428 env->CP0_DEPC = env->active_tc.PC | !!(env->hflags & MIPS_HFLAG_M16);
429 goto enter_debug_mode;
431 env->CP0_Debug |= 1 << CP0DB_DINT;
434 env->CP0_Debug |= 1 << CP0DB_DIB;
437 env->CP0_Debug |= 1 << CP0DB_DBp;
440 env->CP0_Debug |= 1 << CP0DB_DDBS;
443 env->CP0_Debug |= 1 << CP0DB_DDBL;
445 env->CP0_DEPC = exception_resume_pc(env);
446 env->hflags &= ~MIPS_HFLAG_BMASK;
448 env->hflags |= MIPS_HFLAG_DM | MIPS_HFLAG_64 | MIPS_HFLAG_CP0;
449 env->hflags &= ~(MIPS_HFLAG_KSU);
450 /* EJTAG probe trap enable is not implemented... */
451 if (!(env->CP0_Status & (1 << CP0St_EXL)))
452 env->CP0_Cause &= ~(1 << CP0Ca_BD);
453 env->active_tc.PC = (int32_t)0xBFC00480;
454 set_hflags_for_handler(env);
460 env->CP0_Status |= (1 << CP0St_SR);
461 memset(env->CP0_WatchLo, 0, sizeof(*env->CP0_WatchLo));
464 env->CP0_Status |= (1 << CP0St_NMI);
466 env->CP0_ErrorEPC = exception_resume_pc(env);
467 env->hflags &= ~MIPS_HFLAG_BMASK;
468 env->CP0_Status |= (1 << CP0St_ERL) | (1 << CP0St_BEV);
469 env->hflags |= MIPS_HFLAG_64 | MIPS_HFLAG_CP0;
470 env->hflags &= ~(MIPS_HFLAG_KSU);
471 if (!(env->CP0_Status & (1 << CP0St_EXL)))
472 env->CP0_Cause &= ~(1 << CP0Ca_BD);
473 env->active_tc.PC = (int32_t)0xBFC00000;
474 set_hflags_for_handler(env);
476 case EXCP_EXT_INTERRUPT:
478 if (env->CP0_Cause & (1 << CP0Ca_IV))
481 if (env->CP0_Config3 & ((1 << CP0C3_VInt) | (1 << CP0C3_VEIC))) {
482 /* Vectored Interrupts. */
483 unsigned int spacing;
485 unsigned int pending = (env->CP0_Cause & CP0Ca_IP_mask) >> 8;
487 pending &= env->CP0_Status >> 8;
488 /* Compute the Vector Spacing. */
489 spacing = (env->CP0_IntCtl >> CP0IntCtl_VS) & ((1 << 6) - 1);
492 if (env->CP0_Config3 & (1 << CP0C3_VInt)) {
493 /* For VInt mode, the MIPS computes the vector internally. */
494 for (vector = 7; vector > 0; vector--) {
495 if (pending & (1 << vector)) {
501 /* For VEIC mode, the external interrupt controller feeds the
502 vector through the CP0Cause IP lines. */
505 offset = 0x200 + vector * spacing;
513 if (env->error_code == 1 && !(env->CP0_Status & (1 << CP0St_EXL))) {
514 #if defined(TARGET_MIPS64)
515 int R = env->CP0_BadVAddr >> 62;
516 int UX = (env->CP0_Status & (1 << CP0St_UX)) != 0;
517 int SX = (env->CP0_Status & (1 << CP0St_SX)) != 0;
518 int KX = (env->CP0_Status & (1 << CP0St_KX)) != 0;
520 if (((R == 0 && UX) || (R == 1 && SX) || (R == 3 && KX)) &&
521 (!(env->insn_flags & (INSN_LOONGSON2E | INSN_LOONGSON2F))))
530 if (env->error_code == 1 && !(env->CP0_Status & (1 << CP0St_EXL))) {
531 #if defined(TARGET_MIPS64)
532 int R = env->CP0_BadVAddr >> 62;
533 int UX = (env->CP0_Status & (1 << CP0St_UX)) != 0;
534 int SX = (env->CP0_Status & (1 << CP0St_SX)) != 0;
535 int KX = (env->CP0_Status & (1 << CP0St_KX)) != 0;
537 if (((R == 0 && UX) || (R == 1 && SX) || (R == 3 && KX)) &&
538 (!(env->insn_flags & (INSN_LOONGSON2E | INSN_LOONGSON2F))))
568 env->CP0_Cause = (env->CP0_Cause & ~(0x3 << CP0Ca_CE)) |
569 (env->error_code << CP0Ca_CE);
588 /* XXX: TODO: manage defered watch exceptions */
601 if (env->CP0_Status & (1 << CP0St_BEV)) {
607 if (!(env->CP0_Status & (1 << CP0St_EXL))) {
608 env->CP0_EPC = exception_resume_pc(env);
609 if (env->hflags & MIPS_HFLAG_BMASK) {
610 env->CP0_Cause |= (1 << CP0Ca_BD);
612 env->CP0_Cause &= ~(1 << CP0Ca_BD);
614 env->CP0_Status |= (1 << CP0St_EXL);
615 env->hflags |= MIPS_HFLAG_64 | MIPS_HFLAG_CP0;
616 env->hflags &= ~(MIPS_HFLAG_KSU);
618 env->hflags &= ~MIPS_HFLAG_BMASK;
619 if (env->CP0_Status & (1 << CP0St_BEV)) {
620 env->active_tc.PC = (int32_t)0xBFC00200;
622 env->active_tc.PC = (int32_t)(env->CP0_EBase & ~0x3ff);
624 env->active_tc.PC += offset;
625 set_hflags_for_handler(env);
626 env->CP0_Cause = (env->CP0_Cause & ~(0x1f << CP0Ca_EC)) | (cause << CP0Ca_EC);
629 qemu_log("Invalid MIPS exception %d. Exiting\n", env->exception_index);
630 printf("Invalid MIPS exception %d. Exiting\n", env->exception_index);
633 if (qemu_log_enabled() && env->exception_index != EXCP_EXT_INTERRUPT) {
634 qemu_log("%s: PC " TARGET_FMT_lx " EPC " TARGET_FMT_lx " cause %d\n"
635 " S %08x C %08x A " TARGET_FMT_lx " D " TARGET_FMT_lx "\n",
636 __func__, env->active_tc.PC, env->CP0_EPC, cause,
637 env->CP0_Status, env->CP0_Cause, env->CP0_BadVAddr,
641 env->exception_index = EXCP_NONE;
644 #if !defined(CONFIG_USER_ONLY)
645 void r4k_invalidate_tlb (CPUMIPSState *env, int idx, int use_extra)
650 uint8_t ASID = env->CP0_EntryHi & 0xFF;
653 tlb = &env->tlb->mmu.r4k.tlb[idx];
654 /* The qemu TLB is flushed when the ASID changes, so no need to
655 flush these entries again. */
656 if (tlb->G == 0 && tlb->ASID != ASID) {
660 if (use_extra && env->tlb->tlb_in_use < MIPS_TLB_MAX) {
661 /* For tlbwr, we can shadow the discarded entry into
662 a new (fake) TLB entry, as long as the guest can not
663 tell that it's there. */
664 env->tlb->mmu.r4k.tlb[env->tlb->tlb_in_use] = *tlb;
665 env->tlb->tlb_in_use++;
669 /* 1k pages are not supported. */
670 mask = tlb->PageMask | ~(TARGET_PAGE_MASK << 1);
672 addr = tlb->VPN & ~mask;
673 #if defined(TARGET_MIPS64)
674 if (addr >= (0xFFFFFFFF80000000ULL & env->SEGMask)) {
675 addr |= 0x3FFFFF0000000000ULL;
678 end = addr | (mask >> 1);
680 tlb_flush_page (env, addr);
681 addr += TARGET_PAGE_SIZE;
685 addr = (tlb->VPN & ~mask) | ((mask >> 1) + 1);
686 #if defined(TARGET_MIPS64)
687 if (addr >= (0xFFFFFFFF80000000ULL & env->SEGMask)) {
688 addr |= 0x3FFFFF0000000000ULL;
692 while (addr - 1 < end) {
693 tlb_flush_page (env, addr);
694 addr += TARGET_PAGE_SIZE;