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/>.
37 #if !defined(CONFIG_USER_ONLY)
39 /* no MMU emulation */
40 int no_mmu_map_address (CPUState *env, target_phys_addr_t *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_phys_addr_t *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_phys_addr_t *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_phys_addr_t *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;
119 qemu_log("user mode %d h %08x\n", user_mode, env->hflags);
122 if (address <= (int32_t)0x7FFFFFFFUL) {
124 if (env->CP0_Status & (1 << CP0St_ERL)) {
125 *physical = address & 0xFFFFFFFF;
126 *prot = PAGE_READ | PAGE_WRITE;
128 ret = env->tlb->map_address(env, physical, prot, address, rw, access_type);
130 #if defined(TARGET_MIPS64)
131 } else if (address < 0x4000000000000000ULL) {
133 if (UX && address <= (0x3FFFFFFFFFFFFFFFULL & env->SEGMask)) {
134 ret = env->tlb->map_address(env, physical, prot, address, rw, access_type);
136 ret = TLBRET_BADADDR;
138 } else if (address < 0x8000000000000000ULL) {
140 if ((supervisor_mode || kernel_mode) &&
141 SX && address <= (0x7FFFFFFFFFFFFFFFULL & env->SEGMask)) {
142 ret = env->tlb->map_address(env, physical, prot, address, rw, access_type);
144 ret = TLBRET_BADADDR;
146 } else if (address < 0xC000000000000000ULL) {
148 if (kernel_mode && KX &&
149 (address & 0x07FFFFFFFFFFFFFFULL) <= env->PAMask) {
150 *physical = address & env->PAMask;
151 *prot = PAGE_READ | PAGE_WRITE;
153 ret = TLBRET_BADADDR;
155 } else if (address < 0xFFFFFFFF80000000ULL) {
157 if (kernel_mode && KX &&
158 address <= (0xFFFFFFFF7FFFFFFFULL & env->SEGMask)) {
159 ret = env->tlb->map_address(env, physical, prot, address, rw, access_type);
161 ret = TLBRET_BADADDR;
164 } else if (address < (int32_t)0xA0000000UL) {
167 *physical = address - (int32_t)0x80000000UL;
168 *prot = PAGE_READ | PAGE_WRITE;
170 ret = TLBRET_BADADDR;
172 } else if (address < (int32_t)0xC0000000UL) {
175 *physical = address - (int32_t)0xA0000000UL;
176 *prot = PAGE_READ | PAGE_WRITE;
178 ret = TLBRET_BADADDR;
180 } else if (address < (int32_t)0xE0000000UL) {
182 if (supervisor_mode || kernel_mode) {
183 ret = env->tlb->map_address(env, physical, prot, address, rw, access_type);
185 ret = TLBRET_BADADDR;
189 /* XXX: debug segment is not emulated */
191 ret = env->tlb->map_address(env, physical, prot, address, rw, access_type);
193 ret = TLBRET_BADADDR;
197 qemu_log(TARGET_FMT_lx " %d %d => " TARGET_FMT_lx " %d (%d)\n",
198 address, rw, access_type, *physical, *prot, ret);
205 static void raise_mmu_exception(CPUState *env, target_ulong address,
206 int rw, int tlb_error)
208 int exception = 0, error_code = 0;
213 /* Reference to kernel address from user mode or supervisor mode */
214 /* Reference to supervisor address from user mode */
216 exception = EXCP_AdES;
218 exception = EXCP_AdEL;
221 /* No TLB match for a mapped address */
223 exception = EXCP_TLBS;
225 exception = EXCP_TLBL;
229 /* TLB match with no valid bit */
231 exception = EXCP_TLBS;
233 exception = EXCP_TLBL;
236 /* TLB match but 'D' bit is cleared */
237 exception = EXCP_LTLBL;
241 /* Raise exception */
242 env->CP0_BadVAddr = address;
243 env->CP0_Context = (env->CP0_Context & ~0x007fffff) |
244 ((address >> 9) & 0x007ffff0);
246 (env->CP0_EntryHi & 0xFF) | (address & (TARGET_PAGE_MASK << 1));
247 #if defined(TARGET_MIPS64)
248 env->CP0_EntryHi &= env->SEGMask;
249 env->CP0_XContext = (env->CP0_XContext & ((~0ULL) << (env->SEGBITS - 7))) |
250 ((address & 0xC00000000000ULL) >> (55 - env->SEGBITS)) |
251 ((address & ((1ULL << env->SEGBITS) - 1) & 0xFFFFFFFFFFFFE000ULL) >> 9);
253 env->exception_index = exception;
254 env->error_code = error_code;
257 #if !defined(CONFIG_USER_ONLY)
258 target_phys_addr_t cpu_get_phys_page_debug(CPUState *env, target_ulong addr)
260 target_phys_addr_t phys_addr;
263 if (get_physical_address(env, &phys_addr, &prot, addr, 0, ACCESS_INT) != 0)
269 int cpu_mips_handle_mmu_fault (CPUState *env, target_ulong address, int rw,
270 int mmu_idx, int is_softmmu)
272 #if !defined(CONFIG_USER_ONLY)
273 target_phys_addr_t physical;
280 log_cpu_state(env, 0);
282 qemu_log("%s pc " TARGET_FMT_lx " ad " TARGET_FMT_lx " rw %d mmu_idx %d smmu %d\n",
283 __func__, env->active_tc.PC, address, rw, mmu_idx, is_softmmu);
288 /* XXX: put correct access by using cpu_restore_state()
290 access_type = ACCESS_INT;
291 #if defined(CONFIG_USER_ONLY)
292 ret = TLBRET_NOMATCH;
294 ret = get_physical_address(env, &physical, &prot,
295 address, rw, access_type);
296 qemu_log("%s address=" TARGET_FMT_lx " ret %d physical " TARGET_FMT_plx " prot %d\n",
297 __func__, address, ret, physical, prot);
298 if (ret == TLBRET_MATCH) {
299 tlb_set_page(env, address & TARGET_PAGE_MASK,
300 physical & TARGET_PAGE_MASK, prot | PAGE_EXEC,
301 mmu_idx, TARGET_PAGE_SIZE);
306 raise_mmu_exception(env, address, rw, ret);
313 #if !defined(CONFIG_USER_ONLY)
314 target_phys_addr_t cpu_mips_translate_address(CPUState *env, target_ulong address, int rw)
316 target_phys_addr_t physical;
324 access_type = ACCESS_INT;
325 ret = get_physical_address(env, &physical, &prot,
326 address, rw, access_type);
327 if (ret != TLBRET_MATCH) {
328 raise_mmu_exception(env, address, rw, ret);
336 static const char * const excp_names[EXCP_LAST + 1] = {
337 [EXCP_RESET] = "reset",
338 [EXCP_SRESET] = "soft reset",
339 [EXCP_DSS] = "debug single step",
340 [EXCP_DINT] = "debug interrupt",
341 [EXCP_NMI] = "non-maskable interrupt",
342 [EXCP_MCHECK] = "machine check",
343 [EXCP_EXT_INTERRUPT] = "interrupt",
344 [EXCP_DFWATCH] = "deferred watchpoint",
345 [EXCP_DIB] = "debug instruction breakpoint",
346 [EXCP_IWATCH] = "instruction fetch watchpoint",
347 [EXCP_AdEL] = "address error load",
348 [EXCP_AdES] = "address error store",
349 [EXCP_TLBF] = "TLB refill",
350 [EXCP_IBE] = "instruction bus error",
351 [EXCP_DBp] = "debug breakpoint",
352 [EXCP_SYSCALL] = "syscall",
353 [EXCP_BREAK] = "break",
354 [EXCP_CpU] = "coprocessor unusable",
355 [EXCP_RI] = "reserved instruction",
356 [EXCP_OVERFLOW] = "arithmetic overflow",
357 [EXCP_TRAP] = "trap",
358 [EXCP_FPE] = "floating point",
359 [EXCP_DDBS] = "debug data break store",
360 [EXCP_DWATCH] = "data watchpoint",
361 [EXCP_LTLBL] = "TLB modify",
362 [EXCP_TLBL] = "TLB load",
363 [EXCP_TLBS] = "TLB store",
364 [EXCP_DBE] = "data bus error",
365 [EXCP_DDBL] = "debug data break load",
366 [EXCP_THREAD] = "thread",
367 [EXCP_MDMX] = "MDMX",
368 [EXCP_C2E] = "precise coprocessor 2",
369 [EXCP_CACHE] = "cache error",
372 #if !defined(CONFIG_USER_ONLY)
373 static target_ulong exception_resume_pc (CPUState *env)
376 target_ulong isa_mode;
378 isa_mode = !!(env->hflags & MIPS_HFLAG_M16);
379 bad_pc = env->active_tc.PC | isa_mode;
380 if (env->hflags & MIPS_HFLAG_BMASK) {
381 /* If the exception was raised from a delay slot, come back to
383 bad_pc -= (env->hflags & MIPS_HFLAG_B16 ? 2 : 4);
389 static void set_hflags_for_handler (CPUState *env)
391 /* Exception handlers are entered in 32-bit mode. */
392 env->hflags &= ~(MIPS_HFLAG_M16);
393 /* ...except that microMIPS lets you choose. */
394 if (env->insn_flags & ASE_MICROMIPS) {
395 env->hflags |= (!!(env->CP0_Config3
396 & (1 << CP0C3_ISA_ON_EXC))
397 << MIPS_HFLAG_M16_SHIFT);
402 void do_interrupt (CPUState *env)
404 #if !defined(CONFIG_USER_ONLY)
409 if (qemu_log_enabled() && env->exception_index != EXCP_EXT_INTERRUPT) {
410 if (env->exception_index < 0 || env->exception_index > EXCP_LAST)
413 name = excp_names[env->exception_index];
415 qemu_log("%s enter: PC " TARGET_FMT_lx " EPC " TARGET_FMT_lx " %s exception\n",
416 __func__, env->active_tc.PC, env->CP0_EPC, name);
418 if (env->exception_index == EXCP_EXT_INTERRUPT &&
419 (env->hflags & MIPS_HFLAG_DM))
420 env->exception_index = EXCP_DINT;
422 switch (env->exception_index) {
424 env->CP0_Debug |= 1 << CP0DB_DSS;
425 /* Debug single step cannot be raised inside a delay slot and
426 resume will always occur on the next instruction
427 (but we assume the pc has always been updated during
428 code translation). */
429 env->CP0_DEPC = env->active_tc.PC | !!(env->hflags & MIPS_HFLAG_M16);
430 goto enter_debug_mode;
432 env->CP0_Debug |= 1 << CP0DB_DINT;
435 env->CP0_Debug |= 1 << CP0DB_DIB;
438 env->CP0_Debug |= 1 << CP0DB_DBp;
441 env->CP0_Debug |= 1 << CP0DB_DDBS;
444 env->CP0_Debug |= 1 << CP0DB_DDBL;
446 env->CP0_DEPC = exception_resume_pc(env);
447 env->hflags &= ~MIPS_HFLAG_BMASK;
449 env->hflags |= MIPS_HFLAG_DM | MIPS_HFLAG_64 | MIPS_HFLAG_CP0;
450 env->hflags &= ~(MIPS_HFLAG_KSU);
451 /* EJTAG probe trap enable is not implemented... */
452 if (!(env->CP0_Status & (1 << CP0St_EXL)))
453 env->CP0_Cause &= ~(1 << CP0Ca_BD);
454 env->active_tc.PC = (int32_t)0xBFC00480;
455 set_hflags_for_handler(env);
461 env->CP0_Status |= (1 << CP0St_SR);
462 memset(env->CP0_WatchLo, 0, sizeof(*env->CP0_WatchLo));
465 env->CP0_Status |= (1 << CP0St_NMI);
467 env->CP0_ErrorEPC = exception_resume_pc(env);
468 env->hflags &= ~MIPS_HFLAG_BMASK;
469 env->CP0_Status |= (1 << CP0St_ERL) | (1 << CP0St_BEV);
470 env->hflags |= MIPS_HFLAG_64 | MIPS_HFLAG_CP0;
471 env->hflags &= ~(MIPS_HFLAG_KSU);
472 if (!(env->CP0_Status & (1 << CP0St_EXL)))
473 env->CP0_Cause &= ~(1 << CP0Ca_BD);
474 env->active_tc.PC = (int32_t)0xBFC00000;
475 set_hflags_for_handler(env);
477 case EXCP_EXT_INTERRUPT:
479 if (env->CP0_Cause & (1 << CP0Ca_IV))
487 if (env->error_code == 1 && !(env->CP0_Status & (1 << CP0St_EXL))) {
488 #if defined(TARGET_MIPS64)
489 int R = env->CP0_BadVAddr >> 62;
490 int UX = (env->CP0_Status & (1 << CP0St_UX)) != 0;
491 int SX = (env->CP0_Status & (1 << CP0St_SX)) != 0;
492 int KX = (env->CP0_Status & (1 << CP0St_KX)) != 0;
494 if (((R == 0 && UX) || (R == 1 && SX) || (R == 3 && KX)) &&
495 (!(env->insn_flags & (INSN_LOONGSON2E | INSN_LOONGSON2F))))
504 if (env->error_code == 1 && !(env->CP0_Status & (1 << CP0St_EXL))) {
505 #if defined(TARGET_MIPS64)
506 int R = env->CP0_BadVAddr >> 62;
507 int UX = (env->CP0_Status & (1 << CP0St_UX)) != 0;
508 int SX = (env->CP0_Status & (1 << CP0St_SX)) != 0;
509 int KX = (env->CP0_Status & (1 << CP0St_KX)) != 0;
511 if (((R == 0 && UX) || (R == 1 && SX) || (R == 3 && KX)) &&
512 (!(env->insn_flags & (INSN_LOONGSON2E | INSN_LOONGSON2F))))
542 env->CP0_Cause = (env->CP0_Cause & ~(0x3 << CP0Ca_CE)) |
543 (env->error_code << CP0Ca_CE);
562 /* XXX: TODO: manage defered watch exceptions */
572 if (env->CP0_Status & (1 << CP0St_BEV)) {
578 if (!(env->CP0_Status & (1 << CP0St_EXL))) {
579 env->CP0_EPC = exception_resume_pc(env);
580 if (env->hflags & MIPS_HFLAG_BMASK) {
581 env->CP0_Cause |= (1 << CP0Ca_BD);
583 env->CP0_Cause &= ~(1 << CP0Ca_BD);
585 env->CP0_Status |= (1 << CP0St_EXL);
586 env->hflags |= MIPS_HFLAG_64 | MIPS_HFLAG_CP0;
587 env->hflags &= ~(MIPS_HFLAG_KSU);
589 env->hflags &= ~MIPS_HFLAG_BMASK;
590 if (env->CP0_Status & (1 << CP0St_BEV)) {
591 env->active_tc.PC = (int32_t)0xBFC00200;
593 env->active_tc.PC = (int32_t)(env->CP0_EBase & ~0x3ff);
595 env->active_tc.PC += offset;
596 set_hflags_for_handler(env);
597 env->CP0_Cause = (env->CP0_Cause & ~(0x1f << CP0Ca_EC)) | (cause << CP0Ca_EC);
600 qemu_log("Invalid MIPS exception %d. Exiting\n", env->exception_index);
601 printf("Invalid MIPS exception %d. Exiting\n", env->exception_index);
604 if (qemu_log_enabled() && env->exception_index != EXCP_EXT_INTERRUPT) {
605 qemu_log("%s: PC " TARGET_FMT_lx " EPC " TARGET_FMT_lx " cause %d\n"
606 " S %08x C %08x A " TARGET_FMT_lx " D " TARGET_FMT_lx "\n",
607 __func__, env->active_tc.PC, env->CP0_EPC, cause,
608 env->CP0_Status, env->CP0_Cause, env->CP0_BadVAddr,
612 env->exception_index = EXCP_NONE;
615 #if !defined(CONFIG_USER_ONLY)
616 void r4k_invalidate_tlb (CPUState *env, int idx, int use_extra)
621 uint8_t ASID = env->CP0_EntryHi & 0xFF;
624 tlb = &env->tlb->mmu.r4k.tlb[idx];
625 /* The qemu TLB is flushed when the ASID changes, so no need to
626 flush these entries again. */
627 if (tlb->G == 0 && tlb->ASID != ASID) {
631 if (use_extra && env->tlb->tlb_in_use < MIPS_TLB_MAX) {
632 /* For tlbwr, we can shadow the discarded entry into
633 a new (fake) TLB entry, as long as the guest can not
634 tell that it's there. */
635 env->tlb->mmu.r4k.tlb[env->tlb->tlb_in_use] = *tlb;
636 env->tlb->tlb_in_use++;
640 /* 1k pages are not supported. */
641 mask = tlb->PageMask | ~(TARGET_PAGE_MASK << 1);
643 addr = tlb->VPN & ~mask;
644 #if defined(TARGET_MIPS64)
645 if (addr >= (0xFFFFFFFF80000000ULL & env->SEGMask)) {
646 addr |= 0x3FFFFF0000000000ULL;
649 end = addr | (mask >> 1);
651 tlb_flush_page (env, addr);
652 addr += TARGET_PAGE_SIZE;
656 addr = (tlb->VPN & ~mask) | ((mask >> 1) + 1);
657 #if defined(TARGET_MIPS64)
658 if (addr >= (0xFFFFFFFF80000000ULL & env->SEGMask)) {
659 addr |= 0x3FFFFF0000000000ULL;
663 while (addr - 1 < end) {
664 tlb_flush_page (env, addr);
665 addr += TARGET_PAGE_SIZE;