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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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 static int get_physical_address (CPUState *env, target_ulong *physical,
104 int *prot, target_ulong address,
105 int rw, int access_type)
107 /* User mode can only access useg/xuseg */
108 int user_mode = (env->hflags & MIPS_HFLAG_MODE) == MIPS_HFLAG_UM;
109 int supervisor_mode = (env->hflags & MIPS_HFLAG_MODE) == MIPS_HFLAG_SM;
110 int kernel_mode = !user_mode && !supervisor_mode;
111 #if defined(TARGET_MIPS64)
112 int UX = (env->CP0_Status & (1 << CP0St_UX)) != 0;
113 int SX = (env->CP0_Status & (1 << CP0St_SX)) != 0;
114 int KX = (env->CP0_Status & (1 << CP0St_KX)) != 0;
116 int ret = TLBRET_MATCH;
120 fprintf(logfile, "user mode %d h %08x\n",
121 user_mode, env->hflags);
125 if (address <= (int32_t)0x7FFFFFFFUL) {
127 if (env->CP0_Status & (1 << CP0St_ERL)) {
128 *physical = address & 0xFFFFFFFF;
129 *prot = PAGE_READ | PAGE_WRITE;
131 ret = env->tlb->map_address(env, physical, prot, address, rw, access_type);
133 #if defined(TARGET_MIPS64)
134 } else if (address < 0x4000000000000000ULL) {
136 if (UX && address <= (0x3FFFFFFFFFFFFFFFULL & env->SEGMask)) {
137 ret = env->tlb->map_address(env, physical, prot, address, rw, access_type);
139 ret = TLBRET_BADADDR;
141 } else if (address < 0x8000000000000000ULL) {
143 if ((supervisor_mode || kernel_mode) &&
144 SX && address <= (0x7FFFFFFFFFFFFFFFULL & env->SEGMask)) {
145 ret = env->tlb->map_address(env, physical, prot, address, rw, access_type);
147 ret = TLBRET_BADADDR;
149 } else if (address < 0xC000000000000000ULL) {
151 if (kernel_mode && KX &&
152 (address & 0x07FFFFFFFFFFFFFFULL) <= env->PAMask) {
153 *physical = address & env->PAMask;
154 *prot = PAGE_READ | PAGE_WRITE;
156 ret = TLBRET_BADADDR;
158 } else if (address < 0xFFFFFFFF80000000ULL) {
160 if (kernel_mode && KX &&
161 address <= (0xFFFFFFFF7FFFFFFFULL & env->SEGMask)) {
162 ret = env->tlb->map_address(env, physical, prot, address, rw, access_type);
164 ret = TLBRET_BADADDR;
167 } else if (address < (int32_t)0xA0000000UL) {
170 *physical = address - (int32_t)0x80000000UL;
171 *prot = PAGE_READ | PAGE_WRITE;
173 ret = TLBRET_BADADDR;
175 } else if (address < (int32_t)0xC0000000UL) {
178 *physical = address - (int32_t)0xA0000000UL;
179 *prot = PAGE_READ | PAGE_WRITE;
181 ret = TLBRET_BADADDR;
183 } else if (address < (int32_t)0xE0000000UL) {
185 if (supervisor_mode || kernel_mode) {
186 ret = env->tlb->map_address(env, physical, prot, address, rw, access_type);
188 ret = TLBRET_BADADDR;
192 /* XXX: debug segment is not emulated */
194 ret = env->tlb->map_address(env, physical, prot, address, rw, access_type);
196 ret = TLBRET_BADADDR;
201 fprintf(logfile, TARGET_FMT_lx " %d %d => " TARGET_FMT_lx " %d (%d)\n",
202 address, rw, access_type, *physical, *prot, ret);
209 target_phys_addr_t cpu_get_phys_page_debug(CPUState *env, target_ulong addr)
211 if (env->user_mode_only)
214 target_ulong phys_addr;
217 if (get_physical_address(env, &phys_addr, &prot, addr, 0, ACCESS_INT) != 0)
223 void cpu_mips_init_mmu (CPUState *env)
227 int cpu_mips_handle_mmu_fault (CPUState *env, target_ulong address, int rw,
228 int mmu_idx, int is_softmmu)
230 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 (env->user_mode_only) {
251 /* user mode only emulation */
252 ret = TLBRET_NOMATCH;
255 ret = get_physical_address(env, &physical, &prot,
256 address, rw, access_type);
258 fprintf(logfile, "%s address=" TARGET_FMT_lx " ret %d physical " TARGET_FMT_lx " prot %d\n",
259 __func__, address, ret, physical, prot);
261 if (ret == TLBRET_MATCH) {
262 ret = tlb_set_page(env, address & TARGET_PAGE_MASK,
263 physical & TARGET_PAGE_MASK, prot,
264 mmu_idx, is_softmmu);
265 } else if (ret < 0) {
270 /* Reference to kernel address from user mode or supervisor mode */
271 /* Reference to supervisor address from user mode */
273 exception = EXCP_AdES;
275 exception = EXCP_AdEL;
278 /* No TLB match for a mapped address */
280 exception = EXCP_TLBS;
282 exception = EXCP_TLBL;
286 /* TLB match with no valid bit */
288 exception = EXCP_TLBS;
290 exception = EXCP_TLBL;
293 /* TLB match but 'D' bit is cleared */
294 exception = EXCP_LTLBL;
298 /* Raise exception */
299 env->CP0_BadVAddr = address;
300 env->CP0_Context = (env->CP0_Context & ~0x007fffff) |
301 ((address >> 9) & 0x007ffff0);
303 (env->CP0_EntryHi & 0xFF) | (address & (TARGET_PAGE_MASK << 1));
304 #if defined(TARGET_MIPS64)
305 env->CP0_EntryHi &= env->SEGMask;
306 env->CP0_XContext = (env->CP0_XContext & ((~0ULL) << (env->SEGBITS - 7))) |
307 ((address & 0xC00000000000ULL) >> (55 - env->SEGBITS)) |
308 ((address & ((1ULL << env->SEGBITS) - 1) & 0xFFFFFFFFFFFFE000ULL) >> 9);
310 env->exception_index = exception;
311 env->error_code = error_code;
318 static const char * const excp_names[EXCP_LAST + 1] = {
319 [EXCP_RESET] = "reset",
320 [EXCP_SRESET] = "soft reset",
321 [EXCP_DSS] = "debug single step",
322 [EXCP_DINT] = "debug interrupt",
323 [EXCP_NMI] = "non-maskable interrupt",
324 [EXCP_MCHECK] = "machine check",
325 [EXCP_EXT_INTERRUPT] = "interrupt",
326 [EXCP_DFWATCH] = "deferred watchpoint",
327 [EXCP_DIB] = "debug instruction breakpoint",
328 [EXCP_IWATCH] = "instruction fetch watchpoint",
329 [EXCP_AdEL] = "address error load",
330 [EXCP_AdES] = "address error store",
331 [EXCP_TLBF] = "TLB refill",
332 [EXCP_IBE] = "instruction bus error",
333 [EXCP_DBp] = "debug breakpoint",
334 [EXCP_SYSCALL] = "syscall",
335 [EXCP_BREAK] = "break",
336 [EXCP_CpU] = "coprocessor unusable",
337 [EXCP_RI] = "reserved instruction",
338 [EXCP_OVERFLOW] = "arithmetic overflow",
339 [EXCP_TRAP] = "trap",
340 [EXCP_FPE] = "floating point",
341 [EXCP_DDBS] = "debug data break store",
342 [EXCP_DWATCH] = "data watchpoint",
343 [EXCP_LTLBL] = "TLB modify",
344 [EXCP_TLBL] = "TLB load",
345 [EXCP_TLBS] = "TLB store",
346 [EXCP_DBE] = "data bus error",
347 [EXCP_DDBL] = "debug data break load",
348 [EXCP_THREAD] = "thread",
349 [EXCP_MDMX] = "MDMX",
350 [EXCP_C2E] = "precise coprocessor 2",
351 [EXCP_CACHE] = "cache error",
354 void do_interrupt (CPUState *env)
356 if (!env->user_mode_only) {
361 if (logfile && env->exception_index != EXCP_EXT_INTERRUPT) {
362 if (env->exception_index < 0 || env->exception_index > EXCP_LAST)
365 name = excp_names[env->exception_index];
367 fprintf(logfile, "%s enter: PC " TARGET_FMT_lx " EPC " TARGET_FMT_lx " %s exception\n",
368 __func__, env->active_tc.PC, env->CP0_EPC, name);
370 if (env->exception_index == EXCP_EXT_INTERRUPT &&
371 (env->hflags & MIPS_HFLAG_DM))
372 env->exception_index = EXCP_DINT;
374 switch (env->exception_index) {
376 env->CP0_Debug |= 1 << CP0DB_DSS;
377 /* Debug single step cannot be raised inside a delay slot and
378 resume will always occur on the next instruction
379 (but we assume the pc has always been updated during
380 code translation). */
381 env->CP0_DEPC = env->active_tc.PC;
382 goto enter_debug_mode;
384 env->CP0_Debug |= 1 << CP0DB_DINT;
387 env->CP0_Debug |= 1 << CP0DB_DIB;
390 env->CP0_Debug |= 1 << CP0DB_DBp;
393 env->CP0_Debug |= 1 << CP0DB_DDBS;
396 env->CP0_Debug |= 1 << CP0DB_DDBL;
398 if (env->hflags & MIPS_HFLAG_BMASK) {
399 /* If the exception was raised from a delay slot,
400 come back to the jump. */
401 env->CP0_DEPC = env->active_tc.PC - 4;
402 env->hflags &= ~MIPS_HFLAG_BMASK;
404 env->CP0_DEPC = env->active_tc.PC;
407 env->hflags |= MIPS_HFLAG_DM | MIPS_HFLAG_64 | MIPS_HFLAG_CP0;
408 env->hflags &= ~(MIPS_HFLAG_KSU);
409 /* EJTAG probe trap enable is not implemented... */
410 if (!(env->CP0_Status & (1 << CP0St_EXL)))
411 env->CP0_Cause &= ~(1 << CP0Ca_BD);
412 env->active_tc.PC = (int32_t)0xBFC00480;
418 env->CP0_Status |= (1 << CP0St_SR);
419 memset(env->CP0_WatchLo, 0, sizeof(*env->CP0_WatchLo));
422 env->CP0_Status |= (1 << CP0St_NMI);
424 if (env->hflags & MIPS_HFLAG_BMASK) {
425 /* If the exception was raised from a delay slot,
426 come back to the jump. */
427 env->CP0_ErrorEPC = env->active_tc.PC - 4;
428 env->hflags &= ~MIPS_HFLAG_BMASK;
430 env->CP0_ErrorEPC = env->active_tc.PC;
432 env->CP0_Status |= (1 << CP0St_ERL) | (1 << CP0St_BEV);
433 env->hflags |= MIPS_HFLAG_64 | MIPS_HFLAG_CP0;
434 env->hflags &= ~(MIPS_HFLAG_KSU);
435 if (!(env->CP0_Status & (1 << CP0St_EXL)))
436 env->CP0_Cause &= ~(1 << CP0Ca_BD);
437 env->active_tc.PC = (int32_t)0xBFC00000;
439 case EXCP_EXT_INTERRUPT:
441 if (env->CP0_Cause & (1 << CP0Ca_IV))
449 if (env->error_code == 1 && !(env->CP0_Status & (1 << CP0St_EXL))) {
450 #if defined(TARGET_MIPS64)
451 int R = env->CP0_BadVAddr >> 62;
452 int UX = (env->CP0_Status & (1 << CP0St_UX)) != 0;
453 int SX = (env->CP0_Status & (1 << CP0St_SX)) != 0;
454 int KX = (env->CP0_Status & (1 << CP0St_KX)) != 0;
456 if ((R == 0 && UX) || (R == 1 && SX) || (R == 3 && KX))
465 if (env->error_code == 1 && !(env->CP0_Status & (1 << CP0St_EXL))) {
466 #if defined(TARGET_MIPS64)
467 int R = env->CP0_BadVAddr >> 62;
468 int UX = (env->CP0_Status & (1 << CP0St_UX)) != 0;
469 int SX = (env->CP0_Status & (1 << CP0St_SX)) != 0;
470 int KX = (env->CP0_Status & (1 << CP0St_KX)) != 0;
472 if ((R == 0 && UX) || (R == 1 && SX) || (R == 3 && KX))
502 env->CP0_Cause = (env->CP0_Cause & ~(0x3 << CP0Ca_CE)) |
503 (env->error_code << CP0Ca_CE);
522 /* XXX: TODO: manage defered watch exceptions */
532 if (env->CP0_Status & (1 << CP0St_BEV)) {
538 if (!(env->CP0_Status & (1 << CP0St_EXL))) {
539 if (env->hflags & MIPS_HFLAG_BMASK) {
540 /* If the exception was raised from a delay slot,
541 come back to the jump. */
542 env->CP0_EPC = env->active_tc.PC - 4;
543 env->CP0_Cause |= (1 << CP0Ca_BD);
545 env->CP0_EPC = env->active_tc.PC;
546 env->CP0_Cause &= ~(1 << CP0Ca_BD);
548 env->CP0_Status |= (1 << CP0St_EXL);
549 env->hflags |= MIPS_HFLAG_64 | MIPS_HFLAG_CP0;
550 env->hflags &= ~(MIPS_HFLAG_KSU);
552 env->hflags &= ~MIPS_HFLAG_BMASK;
553 if (env->CP0_Status & (1 << CP0St_BEV)) {
554 env->active_tc.PC = (int32_t)0xBFC00200;
556 env->active_tc.PC = (int32_t)(env->CP0_EBase & ~0x3ff);
558 env->active_tc.PC += offset;
559 env->CP0_Cause = (env->CP0_Cause & ~(0x1f << CP0Ca_EC)) | (cause << CP0Ca_EC);
563 fprintf(logfile, "Invalid MIPS exception %d. Exiting\n",
564 env->exception_index);
566 printf("Invalid MIPS exception %d. Exiting\n", env->exception_index);
569 if (logfile && env->exception_index != EXCP_EXT_INTERRUPT) {
570 fprintf(logfile, "%s: PC " TARGET_FMT_lx " EPC " TARGET_FMT_lx " cause %d\n"
571 " S %08x C %08x A " TARGET_FMT_lx " D " TARGET_FMT_lx "\n",
572 __func__, env->active_tc.PC, env->CP0_EPC, cause,
573 env->CP0_Status, env->CP0_Cause, env->CP0_BadVAddr,
577 env->exception_index = EXCP_NONE;
580 void r4k_invalidate_tlb (CPUState *env, int idx, int use_extra)
585 uint8_t ASID = env->CP0_EntryHi & 0xFF;
588 tlb = &env->tlb->mmu.r4k.tlb[idx];
589 /* The qemu TLB is flushed when the ASID changes, so no need to
590 flush these entries again. */
591 if (tlb->G == 0 && tlb->ASID != ASID) {
595 if (use_extra && env->tlb->tlb_in_use < MIPS_TLB_MAX) {
596 /* For tlbwr, we can shadow the discarded entry into
597 a new (fake) TLB entry, as long as the guest can not
598 tell that it's there. */
599 env->tlb->mmu.r4k.tlb[env->tlb->tlb_in_use] = *tlb;
600 env->tlb->tlb_in_use++;
604 /* 1k pages are not supported. */
605 mask = tlb->PageMask | ~(TARGET_PAGE_MASK << 1);
607 addr = tlb->VPN & ~mask;
608 #if defined(TARGET_MIPS64)
609 if (addr >= (0xFFFFFFFF80000000ULL & env->SEGMask)) {
610 addr |= 0x3FFFFF0000000000ULL;
613 end = addr | (mask >> 1);
615 tlb_flush_page (env, addr);
616 addr += TARGET_PAGE_SIZE;
620 addr = (tlb->VPN & ~mask) | ((mask >> 1) + 1);
621 #if defined(TARGET_MIPS64)
622 if (addr >= (0xFFFFFFFF80000000ULL & env->SEGMask)) {
623 addr |= 0x3FFFFF0000000000ULL;
627 while (addr - 1 < end) {
628 tlb_flush_page (env, addr);
629 addr += TARGET_PAGE_SIZE;