/* * 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" enum { 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 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; } static int get_physical_address (CPUMIPSState *env, hwaddr *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 => %" 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) { 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; } #if !defined(CONFIG_USER_ONLY) hwaddr mips_cpu_get_phys_page_debug(CPUState *cs, vaddr addr) { MIPSCPU *cpu = MIPS_CPU(cs); hwaddr phys_addr; int prot; if (get_physical_address(&cpu->env, &phys_addr, &prot, addr, 0, ACCESS_INT) != 0) { return -1; } return phys_addr; } #endif int cpu_mips_handle_mmu_fault (CPUMIPSState *env, target_ulong address, int rw, int mmu_idx) { #if !defined(CONFIG_USER_ONLY) hwaddr physical; int prot; int access_type; #endif int ret = 0; #if 0 log_cpu_state(CPU(mips_env_get_cpu(env)), 0); #endif qemu_log("%s pc " TARGET_FMT_lx " ad " TARGET_FMT_lx " rw %d mmu_idx %d\n", __func__, env->active_tc.PC, address, rw, mmu_idx); rw &= 1; /* 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=" TARGET_FMT_lx " ret %d physical " TARGET_FMT_plx " prot %d\n", __func__, address, ret, physical, prot); if (ret == TLBRET_MATCH) { tlb_set_page(env, address & TARGET_PAGE_MASK, physical & TARGET_PAGE_MASK, prot | PAGE_EXEC, mmu_idx, TARGET_PAGE_SIZE); ret = 0; } else 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; rw &= 1; /* 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", }; 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); } } #endif void mips_cpu_do_interrupt(CPUState *cs) { MIPSCPU *cpu = MIPS_CPU(cs); CPUMIPSState *env = &cpu->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 | !!(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 &= ~(1 << 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 &= ~(1 << 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; 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)) && (!(env->insn_flags & (INSN_LOONGSON2E | INSN_LOONGSON2F)))) 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)) && (!(env->insn_flags & (INSN_LOONGSON2E | INSN_LOONGSON2F)))) 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_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 (env->hflags & MIPS_HFLAG_BMASK) { env->CP0_Cause |= (1 << CP0Ca_BD); } else { 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; 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", 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; } #if !defined(CONFIG_USER_ONLY) void r4k_invalidate_tlb (CPUMIPSState *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; } } } #endif