| /* |
| * 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 "sysemu/kvm.h" |
| #include "exec/cpu_ldst.h" |
| |
| enum { |
| TLBRET_XI = -6, |
| TLBRET_RI = -5, |
| TLBRET_DIRTY = -4, |
| TLBRET_INVALID = -3, |
| TLBRET_NOMATCH = -2, |
| TLBRET_BADADDR = -1, |
| TLBRET_MATCH = 0 |
| }; |
| |
| #if !defined(CONFIG_USER_ONLY) |
| |
| /* no MMU emulation */ |
| int no_mmu_map_address (CPUMIPSState *env, hwaddr *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 (CPUMIPSState *env, hwaddr *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 (CPUMIPSState *env, hwaddr *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->EHINV) { |
| /* TLB match */ |
| int n = !!(address & mask & ~(mask >> 1)); |
| /* Check access rights */ |
| if (!(n ? tlb->V1 : tlb->V0)) { |
| return TLBRET_INVALID; |
| } |
| if (rw == MMU_INST_FETCH && (n ? tlb->XI1 : tlb->XI0)) { |
| return TLBRET_XI; |
| } |
| if (rw == MMU_DATA_LOAD && (n ? tlb->RI1 : tlb->RI0)) { |
| return TLBRET_RI; |
| } |
| if (rw != MMU_DATA_STORE || (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; |
| } |
| |
| static int get_physical_address (CPUMIPSState *env, hwaddr *physical, |
| int *prot, target_ulong real_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; |
| /* effective address (modified for KVM T&E kernel segments) */ |
| target_ulong address = real_address; |
| |
| #if 0 |
| qemu_log("user mode %d h %08x\n", user_mode, env->hflags); |
| #endif |
| |
| #define USEG_LIMIT 0x7FFFFFFFUL |
| #define KSEG0_BASE 0x80000000UL |
| #define KSEG1_BASE 0xA0000000UL |
| #define KSEG2_BASE 0xC0000000UL |
| #define KSEG3_BASE 0xE0000000UL |
| |
| #define KVM_KSEG0_BASE 0x40000000UL |
| #define KVM_KSEG2_BASE 0x60000000UL |
| |
| if (kvm_enabled()) { |
| /* KVM T&E adds guest kernel segments in useg */ |
| if (real_address >= KVM_KSEG0_BASE) { |
| if (real_address < KVM_KSEG2_BASE) { |
| /* kseg0 */ |
| address += KSEG0_BASE - KVM_KSEG0_BASE; |
| } else if (real_address <= USEG_LIMIT) { |
| /* kseg2/3 */ |
| address += KSEG2_BASE - KVM_KSEG2_BASE; |
| } |
| } |
| } |
| |
| if (address <= USEG_LIMIT) { |
| /* 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, real_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, real_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, real_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, real_address, rw, access_type); |
| } else { |
| ret = TLBRET_BADADDR; |
| } |
| #endif |
| } else if (address < (int32_t)KSEG1_BASE) { |
| /* kseg0 */ |
| if (kernel_mode) { |
| *physical = address - (int32_t)KSEG0_BASE; |
| *prot = PAGE_READ | PAGE_WRITE; |
| } else { |
| ret = TLBRET_BADADDR; |
| } |
| } else if (address < (int32_t)KSEG2_BASE) { |
| /* kseg1 */ |
| if (kernel_mode) { |
| *physical = address - (int32_t)KSEG1_BASE; |
| *prot = PAGE_READ | PAGE_WRITE; |
| } else { |
| ret = TLBRET_BADADDR; |
| } |
| } else if (address < (int32_t)KSEG3_BASE) { |
| /* sseg (kseg2) */ |
| if (supervisor_mode || kernel_mode) { |
| ret = env->tlb->map_address(env, physical, prot, real_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, real_address, rw, access_type); |
| } else { |
| ret = TLBRET_BADADDR; |
| } |
| } |
| #if 0 |
| qemu_log(TARGET_FMT_lx " %d %d => %" HWADDR_PRIx " %d (%d)\n", |
| address, rw, access_type, *physical, *prot, ret); |
| #endif |
| |
| return ret; |
| } |
| #endif |
| |
| static void raise_mmu_exception(CPUMIPSState *env, target_ulong address, |
| int rw, int tlb_error) |
| { |
| CPUState *cs = CPU(mips_env_get_cpu(env)); |
| int exception = 0, error_code = 0; |
| |
| if (rw == MMU_INST_FETCH) { |
| error_code |= EXCP_INST_NOTAVAIL; |
| } |
| |
| 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 == MMU_DATA_STORE) { |
| exception = EXCP_AdES; |
| } else { |
| exception = EXCP_AdEL; |
| } |
| break; |
| case TLBRET_NOMATCH: |
| /* No TLB match for a mapped address */ |
| if (rw == MMU_DATA_STORE) { |
| exception = EXCP_TLBS; |
| } else { |
| exception = EXCP_TLBL; |
| } |
| error_code |= EXCP_TLB_NOMATCH; |
| break; |
| case TLBRET_INVALID: |
| /* TLB match with no valid bit */ |
| if (rw == MMU_DATA_STORE) { |
| exception = EXCP_TLBS; |
| } else { |
| exception = EXCP_TLBL; |
| } |
| break; |
| case TLBRET_DIRTY: |
| /* TLB match but 'D' bit is cleared */ |
| exception = EXCP_LTLBL; |
| break; |
| case TLBRET_XI: |
| /* Execute-Inhibit Exception */ |
| if (env->CP0_PageGrain & (1 << CP0PG_IEC)) { |
| exception = EXCP_TLBXI; |
| } else { |
| exception = EXCP_TLBL; |
| } |
| break; |
| case TLBRET_RI: |
| /* Read-Inhibit Exception */ |
| if (env->CP0_PageGrain & (1 << CP0PG_IEC)) { |
| exception = EXCP_TLBRI; |
| } else { |
| exception = EXCP_TLBL; |
| } |
| 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 |
| cs->exception_index = exception; |
| env->error_code = error_code; |
| } |
| |
| #if !defined(CONFIG_USER_ONLY) |
| |
| #define TLB_HANDLER_SIZE (0x40) |
| |
| typedef enum { PROBE = 0, USEFASTTLB, USESLOWTLB } interpreter_state; |
| |
| typedef struct { |
| interpreter_state state; |
| char name[32]; |
| int32_t ebase; |
| uint32_t handler[TLB_HANDLER_SIZE]; |
| } TLBHandlerInfo; |
| |
| // #define DUMP_HANDLER 1 |
| |
| #if defined(DUMP_HANDLER) |
| /* |
| * Print the contents of TLBHandlerInfo buffer holding |
| * holding the TLB exception handler |
| */ |
| static inline void dump_handler(TLBHandlerInfo *handler_info) |
| { |
| int i; |
| fprintf(stderr, "\n===========================================\n"); |
| fprintf(stderr, "%s exception handler\n", handler_info->name); |
| fprintf(stderr, "===========================================\n"); |
| for (i = 0; i < TLB_HANDLER_SIZE; i++) { |
| fprintf(stderr, "0x" TARGET_FMT_lx " %08x\n", |
| (target_ulong)(handler_info->ebase + (i << 2)), |
| handler_info->handler[i]); |
| } |
| fprintf(stderr, "===========================================\n\n"); |
| } |
| #else |
| static inline void dump_handler(TLBHandlerInfo *handler_info) |
| { |
| ; |
| } |
| #endif |
| |
| static TLBHandlerInfo tlb_refill_info = { PROBE, "Refill" }; |
| |
| /* |
| * This function should save the TLB Refill handler to a |
| * tlb_refill_info.handler buffer which will later |
| * be used for the Interpreter |
| */ |
| static inline void tlb_refill_exception_prepare(CPUMIPSState *env) |
| { |
| MIPSCPU *cpu = mips_env_get_cpu(env); |
| CPUState *cs = CPU(cpu); |
| int i; |
| |
| if (unlikely(tlb_refill_info.state == PROBE)) { |
| tlb_refill_info.ebase = env->CP0_EBase; |
| for (i = 0; i < TLB_HANDLER_SIZE; i++) { |
| tlb_refill_info.handler[i] = ldl_phys(cs->as, tlb_refill_info.ebase - 0x80000000 + (i << 2)); |
| CPU.do_tlbwr = 1; |
| } |
| tlb_refill_info.state = USEFASTTLB; |
| dump_handler(&tlb_refill_info); |
| } |
| } |
| |
| static inline void tlb_exception_interpreter_prepare(CPUMIPSState *env, target_ulong address, int 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 |
| |
| CPU.pc = 0; |
| #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)) && |
| (!(env->insn_flags & (INSN_LOONGSON2E | INSN_LOONGSON2F)))) |
| CPU.pc = 0x080 / 4; |
| #endif |
| |
| if (likely(tlb_refill_info.state != PROBE)) |
| return; |
| |
| switch (exception) { |
| case EXCP_TLBF: |
| tlb_refill_exception_prepare(env); |
| break; |
| default: |
| fprintf(stderr, "%s : Unexpected TLB exception %d\n", __func__, exception); |
| exit(1); |
| } |
| } |
| |
| /* |
| * Once the page walk is done by the Interpreter, |
| * this function is responsible for verifying |
| * the TLB Entry. The performance boost comes from this |
| * function actually, because it prevents raising new |
| * exception if it goes through all check and returns TLBRET_MATCH. |
| */ |
| static inline int tlb_exception_return(CPUState *cs, target_ulong address, int rw, |
| int mmu_idx) |
| { |
| MIPSCPU *cpu = MIPS_CPU(cs); |
| CPUMIPSState *env = &cpu->env; |
| |
| target_ulong mask = env->CP0_PageMask | ~(TARGET_PAGE_MASK << 1); |
| target_ulong lo = (address & mask & ~(mask >> 1)) ? env->CP0_EntryLo1 : env->CP0_EntryLo0; |
| uint16_t RI = (lo >> CP0EnLo_RI) & 1; |
| uint16_t XI = (lo >> CP0EnLo_XI) & 1; |
| |
| if (rw == MMU_INST_FETCH && (XI)) |
| return TLBRET_XI; |
| |
| if (rw == MMU_DATA_LOAD && (RI)) |
| return TLBRET_RI; |
| |
| /* Is the TLB entry valid? */ |
| if ((lo & (1 << CP0EnLo_V)) == 0) |
| return TLBRET_INVALID; |
| |
| /* Is this a read access or a write to a modifiable page? */ |
| if (rw != MMU_DATA_STORE || (lo & (1 << CP0EnLo_D))) { |
| hwaddr physical = (lo >> CP0EnLo_PFN) << 12; |
| physical |= address & (mask >> 1); |
| int prot = PAGE_READ; |
| if (lo & (1 << CP0EnLo_D)) |
| prot |= PAGE_WRITE; |
| |
| tlb_set_page(cs, address & TARGET_PAGE_MASK, |
| physical & TARGET_PAGE_MASK, prot | PAGE_EXEC, |
| mmu_idx, TARGET_PAGE_SIZE); |
| return TLBRET_MATCH; |
| } |
| return TLBRET_DIRTY; |
| } |
| |
| /* |
| * This function routes Refill exceptions through the TLB exception Interpreter |
| * and all others are handled by the kernel. |
| */ |
| static inline int do_tlb_refill(CPUState *cs, vaddr address, int rw, int mmu_idx) |
| { |
| MIPSCPU *cpu = MIPS_CPU(cs); |
| CPUMIPSState *env = &cpu->env; |
| int tlbret = TLBRET_NOMATCH; |
| |
| target_ulong saved_badvaddr; |
| target_ulong saved_entryhi; |
| target_ulong saved_context; |
| target_ulong saved_xcontext; |
| target_ulong saved_pagemask; |
| target_ulong saved_pagegrain; |
| |
| saved_badvaddr = env->CP0_BadVAddr; |
| saved_context = env->CP0_Context; |
| saved_xcontext = env->CP0_XContext; |
| saved_entryhi = env->CP0_EntryHi; |
| saved_pagemask = env->CP0_PageMask; |
| saved_pagegrain = env->CP0_PageGrain; |
| |
| if (unlikely(tlb_refill_info.state == USESLOWTLB)) |
| goto out; |
| |
| tlb_exception_interpreter_prepare(env, address, EXCP_TLBF); |
| |
| if (tlb_exception_interpreter(env, tlb_refill_info.handler, TLB_HANDLER_SIZE)) |
| goto out; |
| |
| tlbret = tlb_exception_return(cs, address, rw, mmu_idx); |
| |
| out: |
| env->CP0_BadVAddr = saved_badvaddr; |
| env->CP0_Context = saved_context; |
| env->CP0_XContext = saved_xcontext; |
| env->CP0_EntryHi = saved_entryhi; |
| env->CP0_PageGrain = saved_pagegrain; |
| env->CP0_PageMask = saved_pagemask; |
| |
| return tlbret; |
| } |
| |
| hwaddr mips_cpu_get_phys_page_debug(CPUState *cs, vaddr addr) |
| { |
| MIPSCPU *cpu = MIPS_CPU(cs); |
| CPUMIPSState *env = &cpu->env; |
| hwaddr phys_addr; |
| int prot, ret; |
| |
| ret = get_physical_address(env, &phys_addr, &prot, addr, 0, ACCESS_INT); |
| if (ret != TLBRET_MATCH) { |
| target_ulong saved_badvaddr; |
| target_ulong saved_entryhi; |
| target_ulong saved_context; |
| target_ulong saved_xcontext; |
| target_ulong saved_pagemask; |
| target_ulong saved_pagegrain; |
| |
| saved_pagemask = env->CP0_PageMask; |
| saved_pagegrain = env->CP0_PageGrain; |
| saved_badvaddr = env->CP0_BadVAddr; |
| saved_context = env->CP0_Context; |
| saved_xcontext = env->CP0_XContext; |
| saved_entryhi = env->CP0_EntryHi; |
| |
| tlb_exception_interpreter_prepare(env, addr, EXCP_TLBF); |
| |
| if (likely(tlb_refill_info.state == USEFASTTLB)) { |
| CPU.do_tlbwr = 0; |
| if (tlb_exception_interpreter(env, tlb_refill_info.handler, TLB_HANDLER_SIZE) != 0) { |
| phys_addr = -1; |
| fprintf(stderr, "cpu_get_phys_page_debug() fails for vaddr: 0x" TARGET_FMT_plx "\n", addr); |
| } else { |
| target_ulong mask = env->CP0_PageMask | ~(TARGET_PAGE_MASK << 1); |
| target_ulong lo = (addr & mask & ~(mask >> 1)) ? CPU.CP0_EntryLo1 : CPU.CP0_EntryLo0; |
| phys_addr = ((lo >> CP0EnLo_PFN) << 12) | (addr & (mask >> 1)); |
| } |
| CPU.do_tlbwr = 1; |
| } |
| |
| env->CP0_BadVAddr = saved_badvaddr; |
| env->CP0_Context = saved_context; |
| env->CP0_XContext = saved_xcontext; |
| env->CP0_EntryHi = saved_entryhi; |
| env->CP0_PageGrain = saved_pagegrain; |
| env->CP0_PageMask = saved_pagemask; |
| } |
| |
| return phys_addr; |
| } |
| #endif |
| |
| int mips_cpu_handle_mmu_fault(CPUState *cs, vaddr address, int rw, |
| int mmu_idx) |
| { |
| MIPSCPU *cpu = MIPS_CPU(cs); |
| CPUMIPSState *env = &cpu->env; |
| #if !defined(CONFIG_USER_ONLY) |
| hwaddr physical; |
| int prot; |
| int access_type; |
| #endif |
| int ret = 0; |
| |
| #if 0 |
| log_cpu_state(cs, 0); |
| #endif |
| qemu_log("%s pc " TARGET_FMT_lx " ad %" VADDR_PRIx " rw %d mmu_idx %d\n", |
| __func__, env->active_tc.PC, address, rw, mmu_idx); |
| |
| /* data access */ |
| #if !defined(CONFIG_USER_ONLY) |
| /* XXX: put correct access by using cpu_restore_state() |
| correctly */ |
| access_type = ACCESS_INT; |
| ret = get_physical_address(env, &physical, &prot, |
| address, rw, access_type); |
| qemu_log("%s address=%" VADDR_PRIx " ret %d physical " TARGET_FMT_plx |
| " prot %d\n", |
| __func__, address, ret, physical, prot); |
| if (ret == TLBRET_MATCH) { |
| tlb_set_page(cs, address & TARGET_PAGE_MASK, |
| physical & TARGET_PAGE_MASK, prot | PAGE_EXEC, |
| mmu_idx, TARGET_PAGE_SIZE); |
| ret = 0; |
| } else if (ret == TLBRET_NOMATCH) |
| ret = do_tlb_refill(cs, address, rw, mmu_idx); |
| |
| if (ret < 0) |
| #endif |
| |
| { |
| raise_mmu_exception(env, address, rw, ret); |
| ret = 1; |
| } |
| return ret; |
| } |
| |
| #if !defined(CONFIG_USER_ONLY) |
| hwaddr cpu_mips_translate_address(CPUMIPSState *env, target_ulong address, int rw) |
| { |
| hwaddr physical; |
| int prot; |
| int access_type; |
| int ret = 0; |
| |
| /* data access */ |
| access_type = ACCESS_INT; |
| ret = get_physical_address(env, &physical, &prot, |
| address, rw, access_type); |
| if (ret != TLBRET_MATCH) { |
| 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", |
| [EXCP_TLBXI] = "TLB execute-inhibit", |
| [EXCP_TLBRI] = "TLB read-inhibit", |
| [EXCP_MSADIS] = "MSA disabled", |
| [EXCP_MSAFPE] = "MSA floating point", |
| }; |
| |
| target_ulong exception_resume_pc (CPUMIPSState *env) |
| { |
| target_ulong bad_pc; |
| target_ulong isa_mode; |
| |
| isa_mode = !!(env->hflags & MIPS_HFLAG_M16); |
| bad_pc = env->active_tc.PC | isa_mode; |
| if (env->hflags & MIPS_HFLAG_BMASK) { |
| /* If the exception was raised from a delay slot, come back to |
| the jump. */ |
| bad_pc -= (env->hflags & MIPS_HFLAG_B16 ? 2 : 4); |
| } |
| |
| return bad_pc; |
| } |
| |
| #if !defined(CONFIG_USER_ONLY) |
| static void set_hflags_for_handler (CPUMIPSState *env) |
| { |
| /* Exception handlers are entered in 32-bit mode. */ |
| env->hflags &= ~(MIPS_HFLAG_M16); |
| /* ...except that microMIPS lets you choose. */ |
| if (env->insn_flags & ASE_MICROMIPS) { |
| env->hflags |= (!!(env->CP0_Config3 |
| & (1 << CP0C3_ISA_ON_EXC)) |
| << MIPS_HFLAG_M16_SHIFT); |
| } |
| } |
| |
| static inline void set_badinstr_registers(CPUMIPSState *env) |
| { |
| if (env->hflags & MIPS_HFLAG_M16) { |
| /* TODO: add BadInstr support for microMIPS */ |
| return; |
| } |
| if (env->CP0_Config3 & (1 << CP0C3_BI)) { |
| env->CP0_BadInstr = cpu_ldl_code(env, env->active_tc.PC); |
| } |
| if ((env->CP0_Config3 & (1 << CP0C3_BP)) && |
| (env->hflags & MIPS_HFLAG_BMASK)) { |
| env->CP0_BadInstrP = cpu_ldl_code(env, env->active_tc.PC - 4); |
| } |
| } |
| #endif |
| |
| void mips_cpu_do_interrupt(CPUState *cs) |
| { |
| #if !defined(CONFIG_USER_ONLY) |
| MIPSCPU *cpu = MIPS_CPU(cs); |
| CPUMIPSState *env = &cpu->env; |
| bool update_badinstr = 0; |
| target_ulong offset; |
| int cause = -1; |
| const char *name; |
| |
| if (qemu_log_enabled() && cs->exception_index != EXCP_EXT_INTERRUPT) { |
| if (cs->exception_index < 0 || cs->exception_index > EXCP_LAST) { |
| name = "unknown"; |
| } else { |
| name = excp_names[cs->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 (cs->exception_index == EXCP_EXT_INTERRUPT && |
| (env->hflags & MIPS_HFLAG_DM)) { |
| cs->exception_index = EXCP_DINT; |
| } |
| offset = 0x180; |
| switch (cs->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 | !!(env->hflags & MIPS_HFLAG_M16); |
| 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: |
| env->CP0_DEPC = exception_resume_pc(env); |
| env->hflags &= ~MIPS_HFLAG_BMASK; |
| 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 &= ~(1U << CP0Ca_BD); |
| env->active_tc.PC = (int32_t)0xBFC00480; |
| set_hflags_for_handler(env); |
| break; |
| case EXCP_RESET: |
| cpu_reset(CPU(cpu)); |
| 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: |
| env->CP0_ErrorEPC = exception_resume_pc(env); |
| env->hflags &= ~MIPS_HFLAG_BMASK; |
| 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 &= ~(1U << CP0Ca_BD); |
| env->active_tc.PC = (int32_t)0xBFC00000; |
| set_hflags_for_handler(env); |
| break; |
| case EXCP_EXT_INTERRUPT: |
| cause = 0; |
| if (env->CP0_Cause & (1 << CP0Ca_IV)) |
| offset = 0x200; |
| |
| if (env->CP0_Config3 & ((1 << CP0C3_VInt) | (1 << CP0C3_VEIC))) { |
| /* Vectored Interrupts. */ |
| unsigned int spacing; |
| unsigned int vector; |
| unsigned int pending = (env->CP0_Cause & CP0Ca_IP_mask) >> 8; |
| |
| pending &= env->CP0_Status >> 8; |
| /* Compute the Vector Spacing. */ |
| spacing = (env->CP0_IntCtl >> CP0IntCtl_VS) & ((1 << 6) - 1); |
| spacing <<= 5; |
| |
| if (env->CP0_Config3 & (1 << CP0C3_VInt)) { |
| /* For VInt mode, the MIPS computes the vector internally. */ |
| for (vector = 7; vector > 0; vector--) { |
| if (pending & (1 << vector)) { |
| /* Found it. */ |
| break; |
| } |
| } |
| } else { |
| /* For VEIC mode, the external interrupt controller feeds the |
| vector through the CP0Cause IP lines. */ |
| vector = pending; |
| } |
| offset = 0x200 + vector * spacing; |
| } |
| goto set_EPC; |
| case EXCP_LTLBL: |
| cause = 1; |
| update_badinstr = !(env->error_code & EXCP_INST_NOTAVAIL); |
| goto set_EPC; |
| case EXCP_TLBL: |
| cause = 2; |
| update_badinstr = !(env->error_code & EXCP_INST_NOTAVAIL); |
| if ((env->error_code & EXCP_TLB_NOMATCH) && |
| !(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)) && |
| (!(env->insn_flags & (INSN_LOONGSON2E | INSN_LOONGSON2F)))) |
| offset = 0x080; |
| else |
| #endif |
| offset = 0x000; |
| } |
| goto set_EPC; |
| case EXCP_TLBS: |
| cause = 3; |
| update_badinstr = 1; |
| if ((env->error_code & EXCP_TLB_NOMATCH) && |
| !(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)) && |
| (!(env->insn_flags & (INSN_LOONGSON2E | INSN_LOONGSON2F)))) |
| offset = 0x080; |
| else |
| #endif |
| offset = 0x000; |
| } |
| goto set_EPC; |
| case EXCP_AdEL: |
| cause = 4; |
| update_badinstr = !(env->error_code & EXCP_INST_NOTAVAIL); |
| goto set_EPC; |
| case EXCP_AdES: |
| cause = 5; |
| update_badinstr = 1; |
| goto set_EPC; |
| case EXCP_IBE: |
| cause = 6; |
| goto set_EPC; |
| case EXCP_DBE: |
| cause = 7; |
| goto set_EPC; |
| case EXCP_SYSCALL: |
| cause = 8; |
| update_badinstr = 1; |
| goto set_EPC; |
| case EXCP_BREAK: |
| cause = 9; |
| update_badinstr = 1; |
| goto set_EPC; |
| case EXCP_RI: |
| cause = 10; |
| update_badinstr = 1; |
| goto set_EPC; |
| case EXCP_CpU: |
| cause = 11; |
| update_badinstr = 1; |
| env->CP0_Cause = (env->CP0_Cause & ~(0x3 << CP0Ca_CE)) | |
| (env->error_code << CP0Ca_CE); |
| goto set_EPC; |
| case EXCP_OVERFLOW: |
| cause = 12; |
| update_badinstr = 1; |
| goto set_EPC; |
| case EXCP_TRAP: |
| cause = 13; |
| update_badinstr = 1; |
| goto set_EPC; |
| case EXCP_MSAFPE: |
| cause = 14; |
| update_badinstr = 1; |
| goto set_EPC; |
| case EXCP_FPE: |
| cause = 15; |
| update_badinstr = 1; |
| goto set_EPC; |
| case EXCP_C2E: |
| cause = 18; |
| goto set_EPC; |
| case EXCP_TLBRI: |
| cause = 19; |
| update_badinstr = 1; |
| goto set_EPC; |
| case EXCP_TLBXI: |
| cause = 20; |
| goto set_EPC; |
| case EXCP_MSADIS: |
| cause = 21; |
| update_badinstr = 1; |
| 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_DSPDIS: |
| cause = 26; |
| 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))) { |
| env->CP0_EPC = exception_resume_pc(env); |
| if (update_badinstr) { |
| set_badinstr_registers(env); |
| } |
| if (env->hflags & MIPS_HFLAG_BMASK) { |
| env->CP0_Cause |= (1U << CP0Ca_BD); |
| } else { |
| env->CP0_Cause &= ~(1U << 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; |
| set_hflags_for_handler(env); |
| env->CP0_Cause = (env->CP0_Cause & ~(0x1f << CP0Ca_EC)) | (cause << CP0Ca_EC); |
| break; |
| default: |
| qemu_log("Invalid MIPS exception %d. Exiting\n", cs->exception_index); |
| printf("Invalid MIPS exception %d. Exiting\n", cs->exception_index); |
| exit(1); |
| } |
| if (qemu_log_enabled() && cs->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 |
| cs->exception_index = EXCP_NONE; |
| } |
| |
| bool mips_cpu_exec_interrupt(CPUState *cs, int interrupt_request) |
| { |
| if (interrupt_request & CPU_INTERRUPT_HARD) { |
| MIPSCPU *cpu = MIPS_CPU(cs); |
| CPUMIPSState *env = &cpu->env; |
| |
| if (cpu_mips_hw_interrupts_pending(env)) { |
| /* Raise it */ |
| cs->exception_index = EXCP_EXT_INTERRUPT; |
| env->error_code = 0; |
| mips_cpu_do_interrupt(cs); |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| #if !defined(CONFIG_USER_ONLY) |
| void r4k_invalidate_tlb (CPUMIPSState *env, int idx, int use_extra) |
| { |
| MIPSCPU *cpu = mips_env_get_cpu(env); |
| CPUState *cs; |
| 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) { |
| cs = CPU(cpu); |
| 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(cs, addr); |
| addr += TARGET_PAGE_SIZE; |
| } |
| } |
| if (tlb->V1) { |
| cs = CPU(cpu); |
| 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(cs, addr); |
| addr += TARGET_PAGE_SIZE; |
| } |
| } |
| } |
| #endif |
