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, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA
39 /* no MMU emulation */
40 int no_mmu_map_address (CPUState *env, target_ulong *physical, int *prot,
41 target_ulong address, int rw, int access_type)
44 *prot = PAGE_READ | PAGE_WRITE;
48 /* fixed mapping MMU emulation */
49 int fixed_mmu_map_address (CPUState *env, target_ulong *physical, int *prot,
50 target_ulong address, int rw, int access_type)
52 if (address <= (int32_t)0x7FFFFFFFUL) {
53 if (!(env->CP0_Status & (1 << CP0St_ERL)))
54 *physical = address + 0x40000000UL;
57 } else if (address <= (int32_t)0xBFFFFFFFUL)
58 *physical = address & 0x1FFFFFFF;
62 *prot = PAGE_READ | PAGE_WRITE;
66 /* MIPS32/MIPS64 R4000-style MMU emulation */
67 int r4k_map_address (CPUState *env, target_ulong *physical, int *prot,
68 target_ulong address, int rw, int access_type)
70 uint8_t ASID = env->CP0_EntryHi & 0xFF;
73 for (i = 0; i < env->tlb->tlb_in_use; i++) {
74 r4k_tlb_t *tlb = &env->tlb->mmu.r4k.tlb[i];
75 /* 1k pages are not supported. */
76 target_ulong mask = tlb->PageMask | ~(TARGET_PAGE_MASK << 1);
77 target_ulong tag = address & ~mask;
78 target_ulong VPN = tlb->VPN & ~mask;
79 #if defined(TARGET_MIPS64)
83 /* Check ASID, virtual page number & size */
84 if ((tlb->G == 1 || tlb->ASID == ASID) && VPN == tag) {
86 int n = !!(address & mask & ~(mask >> 1));
87 /* Check access rights */
88 if (!(n ? tlb->V1 : tlb->V0))
89 return TLBRET_INVALID;
90 if (rw == 0 || (n ? tlb->D1 : tlb->D0)) {
91 *physical = tlb->PFN[n] | (address & (mask >> 1));
93 if (n ? tlb->D1 : tlb->D0)
100 return TLBRET_NOMATCH;
103 #if !defined(CONFIG_USER_ONLY)
104 static int get_physical_address (CPUState *env, target_ulong *physical,
105 int *prot, target_ulong address,
106 int rw, int access_type)
108 /* User mode can only access useg/xuseg */
109 int user_mode = (env->hflags & MIPS_HFLAG_MODE) == MIPS_HFLAG_UM;
110 int supervisor_mode = (env->hflags & MIPS_HFLAG_MODE) == MIPS_HFLAG_SM;
111 int kernel_mode = !user_mode && !supervisor_mode;
112 #if defined(TARGET_MIPS64)
113 int UX = (env->CP0_Status & (1 << CP0St_UX)) != 0;
114 int SX = (env->CP0_Status & (1 << CP0St_SX)) != 0;
115 int KX = (env->CP0_Status & (1 << CP0St_KX)) != 0;
117 int ret = TLBRET_MATCH;
121 fprintf(logfile, "user mode %d h %08x\n",
122 user_mode, env->hflags);
126 if (address <= (int32_t)0x7FFFFFFFUL) {
128 if (env->CP0_Status & (1 << CP0St_ERL)) {
129 *physical = address & 0xFFFFFFFF;
130 *prot = PAGE_READ | PAGE_WRITE;
132 ret = env->tlb->map_address(env, physical, prot, address, rw, access_type);
134 #if defined(TARGET_MIPS64)
135 } else if (address < 0x4000000000000000ULL) {
137 if (UX && address <= (0x3FFFFFFFFFFFFFFFULL & env->SEGMask)) {
138 ret = env->tlb->map_address(env, physical, prot, address, rw, access_type);
140 ret = TLBRET_BADADDR;
142 } else if (address < 0x8000000000000000ULL) {
144 if ((supervisor_mode || kernel_mode) &&
145 SX && address <= (0x7FFFFFFFFFFFFFFFULL & env->SEGMask)) {
146 ret = env->tlb->map_address(env, physical, prot, address, rw, access_type);
148 ret = TLBRET_BADADDR;
150 } else if (address < 0xC000000000000000ULL) {
152 if (kernel_mode && KX &&
153 (address & 0x07FFFFFFFFFFFFFFULL) <= env->PAMask) {
154 *physical = address & env->PAMask;
155 *prot = PAGE_READ | PAGE_WRITE;
157 ret = TLBRET_BADADDR;
159 } else if (address < 0xFFFFFFFF80000000ULL) {
161 if (kernel_mode && KX &&
162 address <= (0xFFFFFFFF7FFFFFFFULL & env->SEGMask)) {
163 ret = env->tlb->map_address(env, physical, prot, address, rw, access_type);
165 ret = TLBRET_BADADDR;
168 } else if (address < (int32_t)0xA0000000UL) {
171 *physical = address - (int32_t)0x80000000UL;
172 *prot = PAGE_READ | PAGE_WRITE;
174 ret = TLBRET_BADADDR;
176 } else if (address < (int32_t)0xC0000000UL) {
179 *physical = address - (int32_t)0xA0000000UL;
180 *prot = PAGE_READ | PAGE_WRITE;
182 ret = TLBRET_BADADDR;
184 } else if (address < (int32_t)0xE0000000UL) {
186 if (supervisor_mode || kernel_mode) {
187 ret = env->tlb->map_address(env, physical, prot, address, rw, access_type);
189 ret = TLBRET_BADADDR;
193 /* XXX: debug segment is not emulated */
195 ret = env->tlb->map_address(env, physical, prot, address, rw, access_type);
197 ret = TLBRET_BADADDR;
202 fprintf(logfile, TARGET_FMT_lx " %d %d => " TARGET_FMT_lx " %d (%d)\n",
203 address, rw, access_type, *physical, *prot, ret);
211 target_phys_addr_t cpu_get_phys_page_debug(CPUState *env, target_ulong addr)
213 #if defined(CONFIG_USER_ONLY)
216 target_ulong phys_addr;
219 if (get_physical_address(env, &phys_addr, &prot, addr, 0, ACCESS_INT) != 0)
225 int cpu_mips_handle_mmu_fault (CPUState *env, target_ulong address, int rw,
226 int mmu_idx, int is_softmmu)
228 #if !defined(CONFIG_USER_ONLY)
229 target_ulong physical;
232 int exception = 0, error_code = 0;
238 cpu_dump_state(env, logfile, fprintf, 0);
240 fprintf(logfile, "%s pc " TARGET_FMT_lx " ad " TARGET_FMT_lx " rw %d mmu_idx %d smmu %d\n",
241 __func__, env->active_tc.PC, address, rw, mmu_idx, is_softmmu);
247 /* XXX: put correct access by using cpu_restore_state()
249 access_type = ACCESS_INT;
250 #if defined(CONFIG_USER_ONLY)
251 ret = TLBRET_NOMATCH;
253 ret = get_physical_address(env, &physical, &prot,
254 address, rw, access_type);
256 fprintf(logfile, "%s address=" TARGET_FMT_lx " ret %d physical " TARGET_FMT_lx " prot %d\n",
257 __func__, address, ret, physical, prot);
259 if (ret == TLBRET_MATCH) {
260 ret = tlb_set_page(env, address & TARGET_PAGE_MASK,
261 physical & TARGET_PAGE_MASK, prot,
262 mmu_idx, is_softmmu);
269 /* Reference to kernel address from user mode or supervisor mode */
270 /* Reference to supervisor address from user mode */
272 exception = EXCP_AdES;
274 exception = EXCP_AdEL;
277 /* No TLB match for a mapped address */
279 exception = EXCP_TLBS;
281 exception = EXCP_TLBL;
285 /* TLB match with no valid bit */
287 exception = EXCP_TLBS;
289 exception = EXCP_TLBL;
292 /* TLB match but 'D' bit is cleared */
293 exception = EXCP_LTLBL;
297 /* Raise exception */
298 env->CP0_BadVAddr = address;
299 env->CP0_Context = (env->CP0_Context & ~0x007fffff) |
300 ((address >> 9) & 0x007ffff0);
302 (env->CP0_EntryHi & 0xFF) | (address & (TARGET_PAGE_MASK << 1));
303 #if defined(TARGET_MIPS64)
304 env->CP0_EntryHi &= env->SEGMask;
305 env->CP0_XContext = (env->CP0_XContext & ((~0ULL) << (env->SEGBITS - 7))) |
306 ((address & 0xC00000000000ULL) >> (55 - env->SEGBITS)) |
307 ((address & ((1ULL << env->SEGBITS) - 1) & 0xFFFFFFFFFFFFE000ULL) >> 9);
309 env->exception_index = exception;
310 env->error_code = error_code;
317 static const char * const excp_names[EXCP_LAST + 1] = {
318 [EXCP_RESET] = "reset",
319 [EXCP_SRESET] = "soft reset",
320 [EXCP_DSS] = "debug single step",
321 [EXCP_DINT] = "debug interrupt",
322 [EXCP_NMI] = "non-maskable interrupt",
323 [EXCP_MCHECK] = "machine check",
324 [EXCP_EXT_INTERRUPT] = "interrupt",
325 [EXCP_DFWATCH] = "deferred watchpoint",
326 [EXCP_DIB] = "debug instruction breakpoint",
327 [EXCP_IWATCH] = "instruction fetch watchpoint",
328 [EXCP_AdEL] = "address error load",
329 [EXCP_AdES] = "address error store",
330 [EXCP_TLBF] = "TLB refill",
331 [EXCP_IBE] = "instruction bus error",
332 [EXCP_DBp] = "debug breakpoint",
333 [EXCP_SYSCALL] = "syscall",
334 [EXCP_BREAK] = "break",
335 [EXCP_CpU] = "coprocessor unusable",
336 [EXCP_RI] = "reserved instruction",
337 [EXCP_OVERFLOW] = "arithmetic overflow",
338 [EXCP_TRAP] = "trap",
339 [EXCP_FPE] = "floating point",
340 [EXCP_DDBS] = "debug data break store",
341 [EXCP_DWATCH] = "data watchpoint",
342 [EXCP_LTLBL] = "TLB modify",
343 [EXCP_TLBL] = "TLB load",
344 [EXCP_TLBS] = "TLB store",
345 [EXCP_DBE] = "data bus error",
346 [EXCP_DDBL] = "debug data break load",
347 [EXCP_THREAD] = "thread",
348 [EXCP_MDMX] = "MDMX",
349 [EXCP_C2E] = "precise coprocessor 2",
350 [EXCP_CACHE] = "cache error",
353 void do_interrupt (CPUState *env)
355 #if !defined(CONFIG_USER_ONLY)
360 if (logfile && env->exception_index != EXCP_EXT_INTERRUPT) {
361 if (env->exception_index < 0 || env->exception_index > EXCP_LAST)
364 name = excp_names[env->exception_index];
366 fprintf(logfile, "%s enter: PC " TARGET_FMT_lx " EPC " TARGET_FMT_lx " %s exception\n",
367 __func__, env->active_tc.PC, env->CP0_EPC, name);
369 if (env->exception_index == EXCP_EXT_INTERRUPT &&
370 (env->hflags & MIPS_HFLAG_DM))
371 env->exception_index = EXCP_DINT;
373 switch (env->exception_index) {
375 env->CP0_Debug |= 1 << CP0DB_DSS;
376 /* Debug single step cannot be raised inside a delay slot and
377 resume will always occur on the next instruction
378 (but we assume the pc has always been updated during
379 code translation). */
380 env->CP0_DEPC = env->active_tc.PC;
381 goto enter_debug_mode;
383 env->CP0_Debug |= 1 << CP0DB_DINT;
386 env->CP0_Debug |= 1 << CP0DB_DIB;
389 env->CP0_Debug |= 1 << CP0DB_DBp;
392 env->CP0_Debug |= 1 << CP0DB_DDBS;
395 env->CP0_Debug |= 1 << CP0DB_DDBL;
397 if (env->hflags & MIPS_HFLAG_BMASK) {
398 /* If the exception was raised from a delay slot,
399 come back to the jump. */
400 env->CP0_DEPC = env->active_tc.PC - 4;
401 env->hflags &= ~MIPS_HFLAG_BMASK;
403 env->CP0_DEPC = env->active_tc.PC;
406 env->hflags |= MIPS_HFLAG_DM | MIPS_HFLAG_64 | MIPS_HFLAG_CP0;
407 env->hflags &= ~(MIPS_HFLAG_KSU);
408 /* EJTAG probe trap enable is not implemented... */
409 if (!(env->CP0_Status & (1 << CP0St_EXL)))
410 env->CP0_Cause &= ~(1 << CP0Ca_BD);
411 env->active_tc.PC = (int32_t)0xBFC00480;
417 env->CP0_Status |= (1 << CP0St_SR);
418 memset(env->CP0_WatchLo, 0, sizeof(*env->CP0_WatchLo));
421 env->CP0_Status |= (1 << CP0St_NMI);
423 if (env->hflags & MIPS_HFLAG_BMASK) {
424 /* If the exception was raised from a delay slot,
425 come back to the jump. */
426 env->CP0_ErrorEPC = env->active_tc.PC - 4;
427 env->hflags &= ~MIPS_HFLAG_BMASK;
429 env->CP0_ErrorEPC = env->active_tc.PC;
431 env->CP0_Status |= (1 << CP0St_ERL) | (1 << CP0St_BEV);
432 env->hflags |= MIPS_HFLAG_64 | MIPS_HFLAG_CP0;
433 env->hflags &= ~(MIPS_HFLAG_KSU);
434 if (!(env->CP0_Status & (1 << CP0St_EXL)))
435 env->CP0_Cause &= ~(1 << CP0Ca_BD);
436 env->active_tc.PC = (int32_t)0xBFC00000;
438 case EXCP_EXT_INTERRUPT:
440 if (env->CP0_Cause & (1 << CP0Ca_IV))
448 if (env->error_code == 1 && !(env->CP0_Status & (1 << CP0St_EXL))) {
449 #if defined(TARGET_MIPS64)
450 int R = env->CP0_BadVAddr >> 62;
451 int UX = (env->CP0_Status & (1 << CP0St_UX)) != 0;
452 int SX = (env->CP0_Status & (1 << CP0St_SX)) != 0;
453 int KX = (env->CP0_Status & (1 << CP0St_KX)) != 0;
455 if ((R == 0 && UX) || (R == 1 && SX) || (R == 3 && KX))
464 if (env->error_code == 1 && !(env->CP0_Status & (1 << CP0St_EXL))) {
465 #if defined(TARGET_MIPS64)
466 int R = env->CP0_BadVAddr >> 62;
467 int UX = (env->CP0_Status & (1 << CP0St_UX)) != 0;
468 int SX = (env->CP0_Status & (1 << CP0St_SX)) != 0;
469 int KX = (env->CP0_Status & (1 << CP0St_KX)) != 0;
471 if ((R == 0 && UX) || (R == 1 && SX) || (R == 3 && KX))
501 env->CP0_Cause = (env->CP0_Cause & ~(0x3 << CP0Ca_CE)) |
502 (env->error_code << CP0Ca_CE);
521 /* XXX: TODO: manage defered watch exceptions */
531 if (env->CP0_Status & (1 << CP0St_BEV)) {
537 if (!(env->CP0_Status & (1 << CP0St_EXL))) {
538 if (env->hflags & MIPS_HFLAG_BMASK) {
539 /* If the exception was raised from a delay slot,
540 come back to the jump. */
541 env->CP0_EPC = env->active_tc.PC - 4;
542 env->CP0_Cause |= (1 << CP0Ca_BD);
544 env->CP0_EPC = env->active_tc.PC;
545 env->CP0_Cause &= ~(1 << CP0Ca_BD);
547 env->CP0_Status |= (1 << CP0St_EXL);
548 env->hflags |= MIPS_HFLAG_64 | MIPS_HFLAG_CP0;
549 env->hflags &= ~(MIPS_HFLAG_KSU);
551 env->hflags &= ~MIPS_HFLAG_BMASK;
552 if (env->CP0_Status & (1 << CP0St_BEV)) {
553 env->active_tc.PC = (int32_t)0xBFC00200;
555 env->active_tc.PC = (int32_t)(env->CP0_EBase & ~0x3ff);
557 env->active_tc.PC += offset;
558 env->CP0_Cause = (env->CP0_Cause & ~(0x1f << CP0Ca_EC)) | (cause << CP0Ca_EC);
562 fprintf(logfile, "Invalid MIPS exception %d. Exiting\n",
563 env->exception_index);
565 printf("Invalid MIPS exception %d. Exiting\n", env->exception_index);
568 if (logfile && env->exception_index != EXCP_EXT_INTERRUPT) {
569 fprintf(logfile, "%s: PC " TARGET_FMT_lx " EPC " TARGET_FMT_lx " cause %d\n"
570 " S %08x C %08x A " TARGET_FMT_lx " D " TARGET_FMT_lx "\n",
571 __func__, env->active_tc.PC, env->CP0_EPC, cause,
572 env->CP0_Status, env->CP0_Cause, env->CP0_BadVAddr,
576 env->exception_index = EXCP_NONE;
579 void r4k_invalidate_tlb (CPUState *env, int idx, int use_extra)
584 uint8_t ASID = env->CP0_EntryHi & 0xFF;
587 tlb = &env->tlb->mmu.r4k.tlb[idx];
588 /* The qemu TLB is flushed when the ASID changes, so no need to
589 flush these entries again. */
590 if (tlb->G == 0 && tlb->ASID != ASID) {
594 if (use_extra && env->tlb->tlb_in_use < MIPS_TLB_MAX) {
595 /* For tlbwr, we can shadow the discarded entry into
596 a new (fake) TLB entry, as long as the guest can not
597 tell that it's there. */
598 env->tlb->mmu.r4k.tlb[env->tlb->tlb_in_use] = *tlb;
599 env->tlb->tlb_in_use++;
603 /* 1k pages are not supported. */
604 mask = tlb->PageMask | ~(TARGET_PAGE_MASK << 1);
606 addr = tlb->VPN & ~mask;
607 #if defined(TARGET_MIPS64)
608 if (addr >= (0xFFFFFFFF80000000ULL & env->SEGMask)) {
609 addr |= 0x3FFFFF0000000000ULL;
612 end = addr | (mask >> 1);
614 tlb_flush_page (env, addr);
615 addr += TARGET_PAGE_SIZE;
619 addr = (tlb->VPN & ~mask) | ((mask >> 1) + 1);
620 #if defined(TARGET_MIPS64)
621 if (addr >= (0xFFFFFFFF80000000ULL & env->SEGMask)) {
622 addr |= 0x3FFFFF0000000000ULL;
626 while (addr - 1 < end) {
627 tlb_flush_page (env, addr);
628 addr += TARGET_PAGE_SIZE;