| /* |
| * MIPS emulation helpers for qemu. |
| * |
| * Copyright (c) 2004-2005 Jocelyn Mayer |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2 of the License, or (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with this library; if not, see <http://www.gnu.org/licenses/>. |
| */ |
| #include <stdarg.h> |
| #include <stdlib.h> |
| #include <stdio.h> |
| #include <string.h> |
| #include <inttypes.h> |
| #include <signal.h> |
| |
| #include "cpu.h" |
| #include "exec-all.h" |
| |
| enum { |
| TLBRET_DIRTY = -4, |
| TLBRET_INVALID = -3, |
| TLBRET_NOMATCH = -2, |
| TLBRET_BADADDR = -1, |
| TLBRET_MATCH = 0 |
| }; |
| |
| /* no MMU emulation */ |
| int no_mmu_map_address (CPUState *env, target_phys_addr_t *physical, int *prot, |
| target_ulong address, int rw, int access_type) |
| { |
| *physical = address; |
| *prot = PAGE_READ | PAGE_WRITE; |
| return TLBRET_MATCH; |
| } |
| |
| /* fixed mapping MMU emulation */ |
| int fixed_mmu_map_address (CPUState *env, target_phys_addr_t *physical, int *prot, |
| target_ulong address, int rw, int access_type) |
| { |
| if (address <= (int32_t)0x7FFFFFFFUL) { |
| if (!(env->CP0_Status & (1 << CP0St_ERL))) |
| *physical = address + 0x40000000UL; |
| else |
| *physical = address; |
| } else if (address <= (int32_t)0xBFFFFFFFUL) |
| *physical = address & 0x1FFFFFFF; |
| else |
| *physical = address; |
| |
| *prot = PAGE_READ | PAGE_WRITE; |
| return TLBRET_MATCH; |
| } |
| |
| /* MIPS32/MIPS64 R4000-style MMU emulation */ |
| int r4k_map_address (CPUState *env, target_phys_addr_t *physical, int *prot, |
| target_ulong address, int rw, int access_type) |
| { |
| uint8_t ASID = env->CP0_EntryHi & 0xFF; |
| int i; |
| |
| for (i = 0; i < env->tlb->tlb_in_use; i++) { |
| r4k_tlb_t *tlb = &env->tlb->mmu.r4k.tlb[i]; |
| /* 1k pages are not supported. */ |
| target_ulong mask = tlb->PageMask | ~(TARGET_PAGE_MASK << 1); |
| target_ulong tag = address & ~mask; |
| target_ulong VPN = tlb->VPN & ~mask; |
| #if defined(TARGET_MIPS64) |
| tag &= env->SEGMask; |
| #endif |
| |
| /* Check ASID, virtual page number & size */ |
| if ((tlb->G == 1 || tlb->ASID == ASID) && VPN == tag) { |
| /* TLB match */ |
| int n = !!(address & mask & ~(mask >> 1)); |
| /* Check access rights */ |
| if (!(n ? tlb->V1 : tlb->V0)) |
| return TLBRET_INVALID; |
| if (rw == 0 || (n ? tlb->D1 : tlb->D0)) { |
| *physical = tlb->PFN[n] | (address & (mask >> 1)); |
| *prot = PAGE_READ; |
| if (n ? tlb->D1 : tlb->D0) |
| *prot |= PAGE_WRITE; |
| return TLBRET_MATCH; |
| } |
| return TLBRET_DIRTY; |
| } |
| } |
| return TLBRET_NOMATCH; |
| } |
| |
| #if !defined(CONFIG_USER_ONLY) |
| static int get_physical_address (CPUState *env, target_phys_addr_t *physical, |
| int *prot, target_ulong address, |
| int rw, int access_type) |
| { |
| /* User mode can only access useg/xuseg */ |
| int user_mode = (env->hflags & MIPS_HFLAG_MODE) == MIPS_HFLAG_UM; |
| int supervisor_mode = (env->hflags & MIPS_HFLAG_MODE) == MIPS_HFLAG_SM; |
| int kernel_mode = !user_mode && !supervisor_mode; |
| #if defined(TARGET_MIPS64) |
| int UX = (env->CP0_Status & (1 << CP0St_UX)) != 0; |
| int SX = (env->CP0_Status & (1 << CP0St_SX)) != 0; |
| int KX = (env->CP0_Status & (1 << CP0St_KX)) != 0; |
| #endif |
| int ret = TLBRET_MATCH; |
| |
| #if 0 |
| qemu_log("user mode %d h %08x\n", user_mode, env->hflags); |
| #endif |
| |
| if (address <= (int32_t)0x7FFFFFFFUL) { |
| /* useg */ |
| if (env->CP0_Status & (1 << CP0St_ERL)) { |
| *physical = address & 0xFFFFFFFF; |
| *prot = PAGE_READ | PAGE_WRITE; |
| } else { |
| ret = env->tlb->map_address(env, physical, prot, address, rw, access_type); |
| } |
| #if defined(TARGET_MIPS64) |
| } else if (address < 0x4000000000000000ULL) { |
| /* xuseg */ |
| if (UX && address <= (0x3FFFFFFFFFFFFFFFULL & env->SEGMask)) { |
| ret = env->tlb->map_address(env, physical, prot, address, rw, access_type); |
| } else { |
| ret = TLBRET_BADADDR; |
| } |
| } else if (address < 0x8000000000000000ULL) { |
| /* xsseg */ |
| if ((supervisor_mode || kernel_mode) && |
| SX && address <= (0x7FFFFFFFFFFFFFFFULL & env->SEGMask)) { |
| ret = env->tlb->map_address(env, physical, prot, address, rw, access_type); |
| } else { |
| ret = TLBRET_BADADDR; |
| } |
| } else if (address < 0xC000000000000000ULL) { |
| /* xkphys */ |
| if (kernel_mode && KX && |
| (address & 0x07FFFFFFFFFFFFFFULL) <= env->PAMask) { |
| *physical = address & env->PAMask; |
| *prot = PAGE_READ | PAGE_WRITE; |
| } else { |
| ret = TLBRET_BADADDR; |
| } |
| } else if (address < 0xFFFFFFFF80000000ULL) { |
| /* xkseg */ |
| if (kernel_mode && KX && |
| address <= (0xFFFFFFFF7FFFFFFFULL & env->SEGMask)) { |
| ret = env->tlb->map_address(env, physical, prot, address, rw, access_type); |
| } else { |
| ret = TLBRET_BADADDR; |
| } |
| #endif |
| } else if (address < (int32_t)0xA0000000UL) { |
| /* kseg0 */ |
| if (kernel_mode) { |
| *physical = address - (int32_t)0x80000000UL; |
| *prot = PAGE_READ | PAGE_WRITE; |
| } else { |
| ret = TLBRET_BADADDR; |
| } |
| } else if (address < (int32_t)0xC0000000UL) { |
| /* kseg1 */ |
| if (kernel_mode) { |
| *physical = address - (int32_t)0xA0000000UL; |
| *prot = PAGE_READ | PAGE_WRITE; |
| } else { |
| ret = TLBRET_BADADDR; |
| } |
| } else if (address < (int32_t)0xE0000000UL) { |
| /* sseg (kseg2) */ |
| if (supervisor_mode || kernel_mode) { |
| ret = env->tlb->map_address(env, physical, prot, address, rw, access_type); |
| } else { |
| ret = TLBRET_BADADDR; |
| } |
| } else { |
| /* kseg3 */ |
| /* XXX: debug segment is not emulated */ |
| if (kernel_mode) { |
| ret = env->tlb->map_address(env, physical, prot, address, rw, access_type); |
| } else { |
| ret = TLBRET_BADADDR; |
| } |
| } |
| #if 0 |
| qemu_log(TARGET_FMT_lx " %d %d => " TARGET_FMT_lx " %d (%d)\n", |
| address, rw, access_type, *physical, *prot, ret); |
| #endif |
| |
| return ret; |
| } |
| #endif |
| |
| static void raise_mmu_exception(CPUState *env, target_ulong address, |
| int rw, int tlb_error) |
| { |
| int exception = 0, error_code = 0; |
| |
| switch (tlb_error) { |
| default: |
| case TLBRET_BADADDR: |
| /* Reference to kernel address from user mode or supervisor mode */ |
| /* Reference to supervisor address from user mode */ |
| if (rw) |
| exception = EXCP_AdES; |
| else |
| exception = EXCP_AdEL; |
| break; |
| case TLBRET_NOMATCH: |
| /* No TLB match for a mapped address */ |
| if (rw) |
| exception = EXCP_TLBS; |
| else |
| exception = EXCP_TLBL; |
| error_code = 1; |
| break; |
| case TLBRET_INVALID: |
| /* TLB match with no valid bit */ |
| if (rw) |
| exception = EXCP_TLBS; |
| else |
| exception = EXCP_TLBL; |
| break; |
| case TLBRET_DIRTY: |
| /* TLB match but 'D' bit is cleared */ |
| exception = EXCP_LTLBL; |
| break; |
| |
| } |
| /* Raise exception */ |
| env->CP0_BadVAddr = address; |
| env->CP0_Context = (env->CP0_Context & ~0x007fffff) | |
| ((address >> 9) & 0x007ffff0); |
| env->CP0_EntryHi = |
| (env->CP0_EntryHi & 0xFF) | (address & (TARGET_PAGE_MASK << 1)); |
| #if defined(TARGET_MIPS64) |
| env->CP0_EntryHi &= env->SEGMask; |
| env->CP0_XContext = (env->CP0_XContext & ((~0ULL) << (env->SEGBITS - 7))) | |
| ((address & 0xC00000000000ULL) >> (55 - env->SEGBITS)) | |
| ((address & ((1ULL << env->SEGBITS) - 1) & 0xFFFFFFFFFFFFE000ULL) >> 9); |
| #endif |
| env->exception_index = exception; |
| env->error_code = error_code; |
| } |
| |
| target_phys_addr_t cpu_get_phys_page_debug(CPUState *env, target_ulong addr) |
| { |
| #if defined(CONFIG_USER_ONLY) |
| return addr; |
| #else |
| target_phys_addr_t phys_addr; |
| int prot; |
| |
| if (get_physical_address(env, &phys_addr, &prot, addr, 0, ACCESS_INT) != 0) |
| return -1; |
| return phys_addr; |
| #endif |
| } |
| |
| int cpu_mips_handle_mmu_fault (CPUState *env, target_ulong address, int rw, |
| int mmu_idx, int is_softmmu) |
| { |
| #if !defined(CONFIG_USER_ONLY) |
| target_phys_addr_t physical; |
| int prot; |
| #endif |
| int access_type; |
| int ret = 0; |
| |
| #if 0 |
| log_cpu_state(env, 0); |
| #endif |
| qemu_log("%s pc " TARGET_FMT_lx " ad " TARGET_FMT_lx " rw %d mmu_idx %d smmu %d\n", |
| __func__, env->active_tc.PC, address, rw, mmu_idx, is_softmmu); |
| |
| rw &= 1; |
| |
| /* data access */ |
| /* XXX: put correct access by using cpu_restore_state() |
| correctly */ |
| access_type = ACCESS_INT; |
| #if defined(CONFIG_USER_ONLY) |
| ret = TLBRET_NOMATCH; |
| #else |
| ret = get_physical_address(env, &physical, &prot, |
| address, rw, access_type); |
| qemu_log("%s address=" TARGET_FMT_lx " ret %d physical " TARGET_FMT_plx " prot %d\n", |
| __func__, address, ret, physical, prot); |
| if (ret == TLBRET_MATCH) { |
| ret = tlb_set_page(env, address & TARGET_PAGE_MASK, |
| physical & TARGET_PAGE_MASK, prot, |
| mmu_idx, is_softmmu); |
| } else if (ret < 0) |
| #endif |
| { |
| raise_mmu_exception(env, address, rw, ret); |
| ret = 1; |
| } |
| |
| return ret; |
| } |
| |
| #if !defined(CONFIG_USER_ONLY) |
| target_phys_addr_t cpu_mips_translate_address(CPUState *env, target_ulong address, int rw) |
| { |
| target_phys_addr_t physical; |
| int prot; |
| int access_type; |
| int ret = 0; |
| |
| rw &= 1; |
| |
| /* data access */ |
| access_type = ACCESS_INT; |
| ret = get_physical_address(env, &physical, &prot, |
| address, rw, access_type); |
| if (ret != TLBRET_MATCH || ret != TLBRET_DIRTY) { |
| raise_mmu_exception(env, address, rw, ret); |
| return -1LL; |
| } else { |
| return physical; |
| } |
| } |
| #endif |
| |
| static const char * const excp_names[EXCP_LAST + 1] = { |
| [EXCP_RESET] = "reset", |
| [EXCP_SRESET] = "soft reset", |
| [EXCP_DSS] = "debug single step", |
| [EXCP_DINT] = "debug interrupt", |
| [EXCP_NMI] = "non-maskable interrupt", |
| [EXCP_MCHECK] = "machine check", |
| [EXCP_EXT_INTERRUPT] = "interrupt", |
| [EXCP_DFWATCH] = "deferred watchpoint", |
| [EXCP_DIB] = "debug instruction breakpoint", |
| [EXCP_IWATCH] = "instruction fetch watchpoint", |
| [EXCP_AdEL] = "address error load", |
| [EXCP_AdES] = "address error store", |
| [EXCP_TLBF] = "TLB refill", |
| [EXCP_IBE] = "instruction bus error", |
| [EXCP_DBp] = "debug breakpoint", |
| [EXCP_SYSCALL] = "syscall", |
| [EXCP_BREAK] = "break", |
| [EXCP_CpU] = "coprocessor unusable", |
| [EXCP_RI] = "reserved instruction", |
| [EXCP_OVERFLOW] = "arithmetic overflow", |
| [EXCP_TRAP] = "trap", |
| [EXCP_FPE] = "floating point", |
| [EXCP_DDBS] = "debug data break store", |
| [EXCP_DWATCH] = "data watchpoint", |
| [EXCP_LTLBL] = "TLB modify", |
| [EXCP_TLBL] = "TLB load", |
| [EXCP_TLBS] = "TLB store", |
| [EXCP_DBE] = "data bus error", |
| [EXCP_DDBL] = "debug data break load", |
| [EXCP_THREAD] = "thread", |
| [EXCP_MDMX] = "MDMX", |
| [EXCP_C2E] = "precise coprocessor 2", |
| [EXCP_CACHE] = "cache error", |
| }; |
| |
| void do_interrupt (CPUState *env) |
| { |
| #if !defined(CONFIG_USER_ONLY) |
| target_ulong offset; |
| int cause = -1; |
| const char *name; |
| |
| if (qemu_log_enabled() && env->exception_index != EXCP_EXT_INTERRUPT) { |
| if (env->exception_index < 0 || env->exception_index > EXCP_LAST) |
| name = "unknown"; |
| else |
| name = excp_names[env->exception_index]; |
| |
| qemu_log("%s enter: PC " TARGET_FMT_lx " EPC " TARGET_FMT_lx " %s exception\n", |
| __func__, env->active_tc.PC, env->CP0_EPC, name); |
| } |
| if (env->exception_index == EXCP_EXT_INTERRUPT && |
| (env->hflags & MIPS_HFLAG_DM)) |
| env->exception_index = EXCP_DINT; |
| offset = 0x180; |
| switch (env->exception_index) { |
| case EXCP_DSS: |
| env->CP0_Debug |= 1 << CP0DB_DSS; |
| /* Debug single step cannot be raised inside a delay slot and |
| resume will always occur on the next instruction |
| (but we assume the pc has always been updated during |
| code translation). */ |
| env->CP0_DEPC = env->active_tc.PC; |
| goto enter_debug_mode; |
| case EXCP_DINT: |
| env->CP0_Debug |= 1 << CP0DB_DINT; |
| goto set_DEPC; |
| case EXCP_DIB: |
| env->CP0_Debug |= 1 << CP0DB_DIB; |
| goto set_DEPC; |
| case EXCP_DBp: |
| env->CP0_Debug |= 1 << CP0DB_DBp; |
| goto set_DEPC; |
| case EXCP_DDBS: |
| env->CP0_Debug |= 1 << CP0DB_DDBS; |
| goto set_DEPC; |
| case EXCP_DDBL: |
| env->CP0_Debug |= 1 << CP0DB_DDBL; |
| set_DEPC: |
| if (env->hflags & MIPS_HFLAG_BMASK) { |
| /* If the exception was raised from a delay slot, |
| come back to the jump. */ |
| env->CP0_DEPC = env->active_tc.PC - 4; |
| env->hflags &= ~MIPS_HFLAG_BMASK; |
| } else { |
| env->CP0_DEPC = env->active_tc.PC; |
| } |
| enter_debug_mode: |
| env->hflags |= MIPS_HFLAG_DM | MIPS_HFLAG_64 | MIPS_HFLAG_CP0; |
| env->hflags &= ~(MIPS_HFLAG_KSU); |
| /* EJTAG probe trap enable is not implemented... */ |
| if (!(env->CP0_Status & (1 << CP0St_EXL))) |
| env->CP0_Cause &= ~(1 << CP0Ca_BD); |
| env->active_tc.PC = (int32_t)0xBFC00480; |
| break; |
| case EXCP_RESET: |
| cpu_reset(env); |
| break; |
| case EXCP_SRESET: |
| env->CP0_Status |= (1 << CP0St_SR); |
| memset(env->CP0_WatchLo, 0, sizeof(*env->CP0_WatchLo)); |
| goto set_error_EPC; |
| case EXCP_NMI: |
| env->CP0_Status |= (1 << CP0St_NMI); |
| set_error_EPC: |
| if (env->hflags & MIPS_HFLAG_BMASK) { |
| /* If the exception was raised from a delay slot, |
| come back to the jump. */ |
| env->CP0_ErrorEPC = env->active_tc.PC - 4; |
| env->hflags &= ~MIPS_HFLAG_BMASK; |
| } else { |
| env->CP0_ErrorEPC = env->active_tc.PC; |
| } |
| env->CP0_Status |= (1 << CP0St_ERL) | (1 << CP0St_BEV); |
| env->hflags |= MIPS_HFLAG_64 | MIPS_HFLAG_CP0; |
| env->hflags &= ~(MIPS_HFLAG_KSU); |
| if (!(env->CP0_Status & (1 << CP0St_EXL))) |
| env->CP0_Cause &= ~(1 << CP0Ca_BD); |
| env->active_tc.PC = (int32_t)0xBFC00000; |
| break; |
| case EXCP_EXT_INTERRUPT: |
| cause = 0; |
| if (env->CP0_Cause & (1 << CP0Ca_IV)) |
| offset = 0x200; |
| goto set_EPC; |
| case EXCP_LTLBL: |
| cause = 1; |
| goto set_EPC; |
| case EXCP_TLBL: |
| cause = 2; |
| if (env->error_code == 1 && !(env->CP0_Status & (1 << CP0St_EXL))) { |
| #if defined(TARGET_MIPS64) |
| int R = env->CP0_BadVAddr >> 62; |
| int UX = (env->CP0_Status & (1 << CP0St_UX)) != 0; |
| int SX = (env->CP0_Status & (1 << CP0St_SX)) != 0; |
| int KX = (env->CP0_Status & (1 << CP0St_KX)) != 0; |
| |
| if ((R == 0 && UX) || (R == 1 && SX) || (R == 3 && KX)) |
| offset = 0x080; |
| else |
| #endif |
| offset = 0x000; |
| } |
| goto set_EPC; |
| case EXCP_TLBS: |
| cause = 3; |
| if (env->error_code == 1 && !(env->CP0_Status & (1 << CP0St_EXL))) { |
| #if defined(TARGET_MIPS64) |
| int R = env->CP0_BadVAddr >> 62; |
| int UX = (env->CP0_Status & (1 << CP0St_UX)) != 0; |
| int SX = (env->CP0_Status & (1 << CP0St_SX)) != 0; |
| int KX = (env->CP0_Status & (1 << CP0St_KX)) != 0; |
| |
| if ((R == 0 && UX) || (R == 1 && SX) || (R == 3 && KX)) |
| offset = 0x080; |
| else |
| #endif |
| offset = 0x000; |
| } |
| goto set_EPC; |
| case EXCP_AdEL: |
| cause = 4; |
| goto set_EPC; |
| case EXCP_AdES: |
| cause = 5; |
| goto set_EPC; |
| case EXCP_IBE: |
| cause = 6; |
| goto set_EPC; |
| case EXCP_DBE: |
| cause = 7; |
| goto set_EPC; |
| case EXCP_SYSCALL: |
| cause = 8; |
| goto set_EPC; |
| case EXCP_BREAK: |
| cause = 9; |
| goto set_EPC; |
| case EXCP_RI: |
| cause = 10; |
| goto set_EPC; |
| case EXCP_CpU: |
| cause = 11; |
| env->CP0_Cause = (env->CP0_Cause & ~(0x3 << CP0Ca_CE)) | |
| (env->error_code << CP0Ca_CE); |
| goto set_EPC; |
| case EXCP_OVERFLOW: |
| cause = 12; |
| goto set_EPC; |
| case EXCP_TRAP: |
| cause = 13; |
| goto set_EPC; |
| case EXCP_FPE: |
| cause = 15; |
| goto set_EPC; |
| case EXCP_C2E: |
| cause = 18; |
| goto set_EPC; |
| case EXCP_MDMX: |
| cause = 22; |
| goto set_EPC; |
| case EXCP_DWATCH: |
| cause = 23; |
| /* XXX: TODO: manage defered watch exceptions */ |
| goto set_EPC; |
| case EXCP_MCHECK: |
| cause = 24; |
| goto set_EPC; |
| case EXCP_THREAD: |
| cause = 25; |
| goto set_EPC; |
| case EXCP_CACHE: |
| cause = 30; |
| if (env->CP0_Status & (1 << CP0St_BEV)) { |
| offset = 0x100; |
| } else { |
| offset = 0x20000100; |
| } |
| set_EPC: |
| if (!(env->CP0_Status & (1 << CP0St_EXL))) { |
| if (env->hflags & MIPS_HFLAG_BMASK) { |
| /* If the exception was raised from a delay slot, |
| come back to the jump. */ |
| env->CP0_EPC = env->active_tc.PC - 4; |
| env->CP0_Cause |= (1 << CP0Ca_BD); |
| } else { |
| env->CP0_EPC = env->active_tc.PC; |
| env->CP0_Cause &= ~(1 << CP0Ca_BD); |
| } |
| env->CP0_Status |= (1 << CP0St_EXL); |
| env->hflags |= MIPS_HFLAG_64 | MIPS_HFLAG_CP0; |
| env->hflags &= ~(MIPS_HFLAG_KSU); |
| } |
| env->hflags &= ~MIPS_HFLAG_BMASK; |
| if (env->CP0_Status & (1 << CP0St_BEV)) { |
| env->active_tc.PC = (int32_t)0xBFC00200; |
| } else { |
| env->active_tc.PC = (int32_t)(env->CP0_EBase & ~0x3ff); |
| } |
| env->active_tc.PC += offset; |
| env->CP0_Cause = (env->CP0_Cause & ~(0x1f << CP0Ca_EC)) | (cause << CP0Ca_EC); |
| break; |
| default: |
| qemu_log("Invalid MIPS exception %d. Exiting\n", env->exception_index); |
| printf("Invalid MIPS exception %d. Exiting\n", env->exception_index); |
| exit(1); |
| } |
| if (qemu_log_enabled() && env->exception_index != EXCP_EXT_INTERRUPT) { |
| qemu_log("%s: PC " TARGET_FMT_lx " EPC " TARGET_FMT_lx " cause %d\n" |
| " S %08x C %08x A " TARGET_FMT_lx " D " TARGET_FMT_lx "\n", |
| __func__, env->active_tc.PC, env->CP0_EPC, cause, |
| env->CP0_Status, env->CP0_Cause, env->CP0_BadVAddr, |
| env->CP0_DEPC); |
| } |
| #endif |
| env->exception_index = EXCP_NONE; |
| } |
| |
| void r4k_invalidate_tlb (CPUState *env, int idx, int use_extra) |
| { |
| r4k_tlb_t *tlb; |
| target_ulong addr; |
| target_ulong end; |
| uint8_t ASID = env->CP0_EntryHi & 0xFF; |
| target_ulong mask; |
| |
| tlb = &env->tlb->mmu.r4k.tlb[idx]; |
| /* The qemu TLB is flushed when the ASID changes, so no need to |
| flush these entries again. */ |
| if (tlb->G == 0 && tlb->ASID != ASID) { |
| return; |
| } |
| |
| if (use_extra && env->tlb->tlb_in_use < MIPS_TLB_MAX) { |
| /* For tlbwr, we can shadow the discarded entry into |
| a new (fake) TLB entry, as long as the guest can not |
| tell that it's there. */ |
| env->tlb->mmu.r4k.tlb[env->tlb->tlb_in_use] = *tlb; |
| env->tlb->tlb_in_use++; |
| return; |
| } |
| |
| /* 1k pages are not supported. */ |
| mask = tlb->PageMask | ~(TARGET_PAGE_MASK << 1); |
| if (tlb->V0) { |
| addr = tlb->VPN & ~mask; |
| #if defined(TARGET_MIPS64) |
| if (addr >= (0xFFFFFFFF80000000ULL & env->SEGMask)) { |
| addr |= 0x3FFFFF0000000000ULL; |
| } |
| #endif |
| end = addr | (mask >> 1); |
| while (addr < end) { |
| tlb_flush_page (env, addr); |
| addr += TARGET_PAGE_SIZE; |
| } |
| } |
| if (tlb->V1) { |
| addr = (tlb->VPN & ~mask) | ((mask >> 1) + 1); |
| #if defined(TARGET_MIPS64) |
| if (addr >= (0xFFFFFFFF80000000ULL & env->SEGMask)) { |
| addr |= 0x3FFFFF0000000000ULL; |
| } |
| #endif |
| end = addr | mask; |
| while (addr - 1 < end) { |
| tlb_flush_page (env, addr); |
| addr += TARGET_PAGE_SIZE; |
| } |
| } |
| } |
