/* * virtual page mapping and translated block handling * * Copyright (c) 2003 Fabrice Bellard * * 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, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include "config.h" #ifdef _WIN32 #include #else #include #endif #include #include #include #include #include #include #include #include "cpu.h" #include "exec-all.h" //#define DEBUG_TB_INVALIDATE //#define DEBUG_FLUSH //#define DEBUG_TLB /* make various TB consistency checks */ //#define DEBUG_TB_CHECK //#define DEBUG_TLB_CHECK /* threshold to flush the translated code buffer */ #define CODE_GEN_BUFFER_MAX_SIZE (CODE_GEN_BUFFER_SIZE - CODE_GEN_MAX_SIZE) #define SMC_BITMAP_USE_THRESHOLD 10 #define MMAP_AREA_START 0x00000000 #define MMAP_AREA_END 0xa8000000 TranslationBlock tbs[CODE_GEN_MAX_BLOCKS]; TranslationBlock *tb_hash[CODE_GEN_HASH_SIZE]; TranslationBlock *tb_phys_hash[CODE_GEN_PHYS_HASH_SIZE]; int nb_tbs; /* any access to the tbs or the page table must use this lock */ spinlock_t tb_lock = SPIN_LOCK_UNLOCKED; uint8_t code_gen_buffer[CODE_GEN_BUFFER_SIZE]; uint8_t *code_gen_ptr; int phys_ram_size; int phys_ram_fd; uint8_t *phys_ram_base; uint8_t *phys_ram_dirty; typedef struct PageDesc { /* list of TBs intersecting this ram page */ TranslationBlock *first_tb; /* in order to optimize self modifying code, we count the number of lookups we do to a given page to use a bitmap */ unsigned int code_write_count; uint8_t *code_bitmap; #if defined(CONFIG_USER_ONLY) unsigned long flags; #endif } PageDesc; typedef struct PhysPageDesc { /* offset in host memory of the page + io_index in the low 12 bits */ unsigned long phys_offset; } PhysPageDesc; typedef struct VirtPageDesc { /* physical address of code page. It is valid only if 'valid_tag' matches 'virt_valid_tag' */ target_ulong phys_addr; unsigned int valid_tag; #if !defined(CONFIG_SOFTMMU) /* original page access rights. It is valid only if 'valid_tag' matches 'virt_valid_tag' */ unsigned int prot; #endif } VirtPageDesc; #define L2_BITS 10 #define L1_BITS (32 - L2_BITS - TARGET_PAGE_BITS) #define L1_SIZE (1 << L1_BITS) #define L2_SIZE (1 << L2_BITS) static void io_mem_init(void); unsigned long qemu_real_host_page_size; unsigned long qemu_host_page_bits; unsigned long qemu_host_page_size; unsigned long qemu_host_page_mask; /* XXX: for system emulation, it could just be an array */ static PageDesc *l1_map[L1_SIZE]; static PhysPageDesc *l1_phys_map[L1_SIZE]; #if !defined(CONFIG_USER_ONLY) static VirtPageDesc *l1_virt_map[L1_SIZE]; static unsigned int virt_valid_tag; #endif /* io memory support */ CPUWriteMemoryFunc *io_mem_write[IO_MEM_NB_ENTRIES][4]; CPUReadMemoryFunc *io_mem_read[IO_MEM_NB_ENTRIES][4]; void *io_mem_opaque[IO_MEM_NB_ENTRIES]; static int io_mem_nb; /* log support */ char *logfilename = "/tmp/qemu.log"; FILE *logfile; int loglevel; static void page_init(void) { /* NOTE: we can always suppose that qemu_host_page_size >= TARGET_PAGE_SIZE */ #ifdef _WIN32 { SYSTEM_INFO system_info; DWORD old_protect; GetSystemInfo(&system_info); qemu_real_host_page_size = system_info.dwPageSize; VirtualProtect(code_gen_buffer, sizeof(code_gen_buffer), PAGE_EXECUTE_READWRITE, &old_protect); } #else qemu_real_host_page_size = getpagesize(); { unsigned long start, end; start = (unsigned long)code_gen_buffer; start &= ~(qemu_real_host_page_size - 1); end = (unsigned long)code_gen_buffer + sizeof(code_gen_buffer); end += qemu_real_host_page_size - 1; end &= ~(qemu_real_host_page_size - 1); mprotect((void *)start, end - start, PROT_READ | PROT_WRITE | PROT_EXEC); } #endif if (qemu_host_page_size == 0) qemu_host_page_size = qemu_real_host_page_size; if (qemu_host_page_size < TARGET_PAGE_SIZE) qemu_host_page_size = TARGET_PAGE_SIZE; qemu_host_page_bits = 0; while ((1 << qemu_host_page_bits) < qemu_host_page_size) qemu_host_page_bits++; qemu_host_page_mask = ~(qemu_host_page_size - 1); #if !defined(CONFIG_USER_ONLY) virt_valid_tag = 1; #endif } static inline PageDesc *page_find_alloc(unsigned int index) { PageDesc **lp, *p; lp = &l1_map[index >> L2_BITS]; p = *lp; if (!p) { /* allocate if not found */ p = qemu_malloc(sizeof(PageDesc) * L2_SIZE); memset(p, 0, sizeof(PageDesc) * L2_SIZE); *lp = p; } return p + (index & (L2_SIZE - 1)); } static inline PageDesc *page_find(unsigned int index) { PageDesc *p; p = l1_map[index >> L2_BITS]; if (!p) return 0; return p + (index & (L2_SIZE - 1)); } static inline PhysPageDesc *phys_page_find_alloc(unsigned int index) { PhysPageDesc **lp, *p; lp = &l1_phys_map[index >> L2_BITS]; p = *lp; if (!p) { /* allocate if not found */ p = qemu_malloc(sizeof(PhysPageDesc) * L2_SIZE); memset(p, 0, sizeof(PhysPageDesc) * L2_SIZE); *lp = p; } return p + (index & (L2_SIZE - 1)); } static inline PhysPageDesc *phys_page_find(unsigned int index) { PhysPageDesc *p; p = l1_phys_map[index >> L2_BITS]; if (!p) return 0; return p + (index & (L2_SIZE - 1)); } #if !defined(CONFIG_USER_ONLY) static void tlb_protect_code(CPUState *env, target_ulong addr); static void tlb_unprotect_code_phys(CPUState *env, unsigned long phys_addr, target_ulong vaddr); static inline VirtPageDesc *virt_page_find_alloc(unsigned int index) { VirtPageDesc **lp, *p; lp = &l1_virt_map[index >> L2_BITS]; p = *lp; if (!p) { /* allocate if not found */ p = qemu_malloc(sizeof(VirtPageDesc) * L2_SIZE); memset(p, 0, sizeof(VirtPageDesc) * L2_SIZE); *lp = p; } return p + (index & (L2_SIZE - 1)); } static inline VirtPageDesc *virt_page_find(unsigned int index) { VirtPageDesc *p; p = l1_virt_map[index >> L2_BITS]; if (!p) return 0; return p + (index & (L2_SIZE - 1)); } static void virt_page_flush(void) { int i, j; VirtPageDesc *p; virt_valid_tag++; if (virt_valid_tag == 0) { virt_valid_tag = 1; for(i = 0; i < L1_SIZE; i++) { p = l1_virt_map[i]; if (p) { for(j = 0; j < L2_SIZE; j++) p[j].valid_tag = 0; } } } } #else static void virt_page_flush(void) { } #endif void cpu_exec_init(void) { if (!code_gen_ptr) { code_gen_ptr = code_gen_buffer; page_init(); io_mem_init(); } } static inline void invalidate_page_bitmap(PageDesc *p) { if (p->code_bitmap) { qemu_free(p->code_bitmap); p->code_bitmap = NULL; } p->code_write_count = 0; } /* set to NULL all the 'first_tb' fields in all PageDescs */ static void page_flush_tb(void) { int i, j; PageDesc *p; for(i = 0; i < L1_SIZE; i++) { p = l1_map[i]; if (p) { for(j = 0; j < L2_SIZE; j++) { p->first_tb = NULL; invalidate_page_bitmap(p); p++; } } } } /* flush all the translation blocks */ /* XXX: tb_flush is currently not thread safe */ void tb_flush(CPUState *env) { #if defined(DEBUG_FLUSH) printf("qemu: flush code_size=%d nb_tbs=%d avg_tb_size=%d\n", code_gen_ptr - code_gen_buffer, nb_tbs, nb_tbs > 0 ? (code_gen_ptr - code_gen_buffer) / nb_tbs : 0); #endif nb_tbs = 0; memset (tb_hash, 0, CODE_GEN_HASH_SIZE * sizeof (void *)); virt_page_flush(); memset (tb_phys_hash, 0, CODE_GEN_PHYS_HASH_SIZE * sizeof (void *)); page_flush_tb(); code_gen_ptr = code_gen_buffer; /* XXX: flush processor icache at this point if cache flush is expensive */ } #ifdef DEBUG_TB_CHECK static void tb_invalidate_check(unsigned long address) { TranslationBlock *tb; int i; address &= TARGET_PAGE_MASK; for(i = 0;i < CODE_GEN_HASH_SIZE; i++) { for(tb = tb_hash[i]; tb != NULL; tb = tb->hash_next) { if (!(address + TARGET_PAGE_SIZE <= tb->pc || address >= tb->pc + tb->size)) { printf("ERROR invalidate: address=%08lx PC=%08lx size=%04x\n", address, tb->pc, tb->size); } } } } /* verify that all the pages have correct rights for code */ static void tb_page_check(void) { TranslationBlock *tb; int i, flags1, flags2; for(i = 0;i < CODE_GEN_HASH_SIZE; i++) { for(tb = tb_hash[i]; tb != NULL; tb = tb->hash_next) { flags1 = page_get_flags(tb->pc); flags2 = page_get_flags(tb->pc + tb->size - 1); if ((flags1 & PAGE_WRITE) || (flags2 & PAGE_WRITE)) { printf("ERROR page flags: PC=%08lx size=%04x f1=%x f2=%x\n", tb->pc, tb->size, flags1, flags2); } } } } void tb_jmp_check(TranslationBlock *tb) { TranslationBlock *tb1; unsigned int n1; /* suppress any remaining jumps to this TB */ tb1 = tb->jmp_first; for(;;) { n1 = (long)tb1 & 3; tb1 = (TranslationBlock *)((long)tb1 & ~3); if (n1 == 2) break; tb1 = tb1->jmp_next[n1]; } /* check end of list */ if (tb1 != tb) { printf("ERROR: jmp_list from 0x%08lx\n", (long)tb); } } #endif /* invalidate one TB */ static inline void tb_remove(TranslationBlock **ptb, TranslationBlock *tb, int next_offset) { TranslationBlock *tb1; for(;;) { tb1 = *ptb; if (tb1 == tb) { *ptb = *(TranslationBlock **)((char *)tb1 + next_offset); break; } ptb = (TranslationBlock **)((char *)tb1 + next_offset); } } static inline void tb_page_remove(TranslationBlock **ptb, TranslationBlock *tb) { TranslationBlock *tb1; unsigned int n1; for(;;) { tb1 = *ptb; n1 = (long)tb1 & 3; tb1 = (TranslationBlock *)((long)tb1 & ~3); if (tb1 == tb) { *ptb = tb1->page_next[n1]; break; } ptb = &tb1->page_next[n1]; } } static inline void tb_jmp_remove(TranslationBlock *tb, int n) { TranslationBlock *tb1, **ptb; unsigned int n1; ptb = &tb->jmp_next[n]; tb1 = *ptb; if (tb1) { /* find tb(n) in circular list */ for(;;) { tb1 = *ptb; n1 = (long)tb1 & 3; tb1 = (TranslationBlock *)((long)tb1 & ~3); if (n1 == n && tb1 == tb) break; if (n1 == 2) { ptb = &tb1->jmp_first; } else { ptb = &tb1->jmp_next[n1]; } } /* now we can suppress tb(n) from the list */ *ptb = tb->jmp_next[n]; tb->jmp_next[n] = NULL; } } /* reset the jump entry 'n' of a TB so that it is not chained to another TB */ static inline void tb_reset_jump(TranslationBlock *tb, int n) { tb_set_jmp_target(tb, n, (unsigned long)(tb->tc_ptr + tb->tb_next_offset[n])); } static inline void tb_invalidate(TranslationBlock *tb) { unsigned int h, n1; TranslationBlock *tb1, *tb2, **ptb; tb_invalidated_flag = 1; /* remove the TB from the hash list */ h = tb_hash_func(tb->pc); ptb = &tb_hash[h]; for(;;) { tb1 = *ptb; /* NOTE: the TB is not necessarily linked in the hash. It indicates that it is not currently used */ if (tb1 == NULL) return; if (tb1 == tb) { *ptb = tb1->hash_next; break; } ptb = &tb1->hash_next; } /* suppress this TB from the two jump lists */ tb_jmp_remove(tb, 0); tb_jmp_remove(tb, 1); /* suppress any remaining jumps to this TB */ tb1 = tb->jmp_first; for(;;) { n1 = (long)tb1 & 3; if (n1 == 2) break; tb1 = (TranslationBlock *)((long)tb1 & ~3); tb2 = tb1->jmp_next[n1]; tb_reset_jump(tb1, n1); tb1->jmp_next[n1] = NULL; tb1 = tb2; } tb->jmp_first = (TranslationBlock *)((long)tb | 2); /* fail safe */ } static inline void tb_phys_invalidate(TranslationBlock *tb, unsigned int page_addr) { PageDesc *p; unsigned int h; target_ulong phys_pc; /* remove the TB from the hash list */ phys_pc = tb->page_addr[0] + (tb->pc & ~TARGET_PAGE_MASK); h = tb_phys_hash_func(phys_pc); tb_remove(&tb_phys_hash[h], tb, offsetof(TranslationBlock, phys_hash_next)); /* remove the TB from the page list */ if (tb->page_addr[0] != page_addr) { p = page_find(tb->page_addr[0] >> TARGET_PAGE_BITS); tb_page_remove(&p->first_tb, tb); invalidate_page_bitmap(p); } if (tb->page_addr[1] != -1 && tb->page_addr[1] != page_addr) { p = page_find(tb->page_addr[1] >> TARGET_PAGE_BITS); tb_page_remove(&p->first_tb, tb); invalidate_page_bitmap(p); } tb_invalidate(tb); } static inline void set_bits(uint8_t *tab, int start, int len) { int end, mask, end1; end = start + len; tab += start >> 3; mask = 0xff << (start & 7); if ((start & ~7) == (end & ~7)) { if (start < end) { mask &= ~(0xff << (end & 7)); *tab |= mask; } } else { *tab++ |= mask; start = (start + 8) & ~7; end1 = end & ~7; while (start < end1) { *tab++ = 0xff; start += 8; } if (start < end) { mask = ~(0xff << (end & 7)); *tab |= mask; } } } static void build_page_bitmap(PageDesc *p) { int n, tb_start, tb_end; TranslationBlock *tb; p->code_bitmap = qemu_malloc(TARGET_PAGE_SIZE / 8); if (!p->code_bitmap) return; memset(p->code_bitmap, 0, TARGET_PAGE_SIZE / 8); tb = p->first_tb; while (tb != NULL) { n = (long)tb & 3; tb = (TranslationBlock *)((long)tb & ~3); /* NOTE: this is subtle as a TB may span two physical pages */ if (n == 0) { /* NOTE: tb_end may be after the end of the page, but it is not a problem */ tb_start = tb->pc & ~TARGET_PAGE_MASK; tb_end = tb_start + tb->size; if (tb_end > TARGET_PAGE_SIZE) tb_end = TARGET_PAGE_SIZE; } else { tb_start = 0; tb_end = ((tb->pc + tb->size) & ~TARGET_PAGE_MASK); } set_bits(p->code_bitmap, tb_start, tb_end - tb_start); tb = tb->page_next[n]; } } #ifdef TARGET_HAS_PRECISE_SMC static void tb_gen_code(CPUState *env, target_ulong pc, target_ulong cs_base, int flags, int cflags) { TranslationBlock *tb; uint8_t *tc_ptr; target_ulong phys_pc, phys_page2, virt_page2; int code_gen_size; phys_pc = get_phys_addr_code(env, (unsigned long)pc); tb = tb_alloc((unsigned long)pc); if (!tb) { /* flush must be done */ tb_flush(env); /* cannot fail at this point */ tb = tb_alloc((unsigned long)pc); } tc_ptr = code_gen_ptr; tb->tc_ptr = tc_ptr; tb->cs_base = cs_base; tb->flags = flags; tb->cflags = cflags; cpu_gen_code(env, tb, CODE_GEN_MAX_SIZE, &code_gen_size); code_gen_ptr = (void *)(((unsigned long)code_gen_ptr + code_gen_size + CODE_GEN_ALIGN - 1) & ~(CODE_GEN_ALIGN - 1)); /* check next page if needed */ virt_page2 = ((unsigned long)pc + tb->size - 1) & TARGET_PAGE_MASK; phys_page2 = -1; if (((unsigned long)pc & TARGET_PAGE_MASK) != virt_page2) { phys_page2 = get_phys_addr_code(env, virt_page2); } tb_link_phys(tb, phys_pc, phys_page2); } #endif /* invalidate all TBs which intersect with the target physical page starting in range [start;end[. NOTE: start and end must refer to the same physical page. 'is_cpu_write_access' should be true if called from a real cpu write access: the virtual CPU will exit the current TB if code is modified inside this TB. */ void tb_invalidate_phys_page_range(target_ulong start, target_ulong end, int is_cpu_write_access) { int n, current_tb_modified, current_tb_not_found, current_flags; CPUState *env = cpu_single_env; PageDesc *p; TranslationBlock *tb, *tb_next, *current_tb, *saved_tb; target_ulong tb_start, tb_end; target_ulong current_pc, current_cs_base; p = page_find(start >> TARGET_PAGE_BITS); if (!p) return; if (!p->code_bitmap && ++p->code_write_count >= SMC_BITMAP_USE_THRESHOLD && is_cpu_write_access) { /* build code bitmap */ build_page_bitmap(p); } /* we remove all the TBs in the range [start, end[ */ /* XXX: see if in some cases it could be faster to invalidate all the code */ current_tb_not_found = is_cpu_write_access; current_tb_modified = 0; current_tb = NULL; /* avoid warning */ current_pc = 0; /* avoid warning */ current_cs_base = 0; /* avoid warning */ current_flags = 0; /* avoid warning */ tb = p->first_tb; while (tb != NULL) { n = (long)tb & 3; tb = (TranslationBlock *)((long)tb & ~3); tb_next = tb->page_next[n]; /* NOTE: this is subtle as a TB may span two physical pages */ if (n == 0) { /* NOTE: tb_end may be after the end of the page, but it is not a problem */ tb_start = tb->page_addr[0] + (tb->pc & ~TARGET_PAGE_MASK); tb_end = tb_start + tb->size; } else { tb_start = tb->page_addr[1]; tb_end = tb_start + ((tb->pc + tb->size) & ~TARGET_PAGE_MASK); } if (!(tb_end <= start || tb_start >= end)) { #ifdef TARGET_HAS_PRECISE_SMC if (current_tb_not_found) { current_tb_not_found = 0; current_tb = NULL; if (env->mem_write_pc) { /* now we have a real cpu fault */ current_tb = tb_find_pc(env->mem_write_pc); } } if (current_tb == tb && !(current_tb->cflags & CF_SINGLE_INSN)) { /* If we are modifying the current TB, we must stop its execution. We could be more precise by checking that the modification is after the current PC, but it would require a specialized function to partially restore the CPU state */ current_tb_modified = 1; cpu_restore_state(current_tb, env, env->mem_write_pc, NULL); #if defined(TARGET_I386) current_flags = env->hflags; current_flags |= (env->eflags & (IOPL_MASK | TF_MASK | VM_MASK)); current_cs_base = (target_ulong)env->segs[R_CS].base; current_pc = current_cs_base + env->eip; #else #error unsupported CPU #endif } #endif /* TARGET_HAS_PRECISE_SMC */ saved_tb = env->current_tb; env->current_tb = NULL; tb_phys_invalidate(tb, -1); env->current_tb = saved_tb; if (env->interrupt_request && env->current_tb) cpu_interrupt(env, env->interrupt_request); } tb = tb_next; } #if !defined(CONFIG_USER_ONLY) /* if no code remaining, no need to continue to use slow writes */ if (!p->first_tb) { invalidate_page_bitmap(p); if (is_cpu_write_access) { tlb_unprotect_code_phys(env, start, env->mem_write_vaddr); } } #endif #ifdef TARGET_HAS_PRECISE_SMC if (current_tb_modified) { /* we generate a block containing just the instruction modifying the memory. It will ensure that it cannot modify itself */ env->current_tb = NULL; tb_gen_code(env, current_pc, current_cs_base, current_flags, CF_SINGLE_INSN); cpu_resume_from_signal(env, NULL); } #endif } /* len must be <= 8 and start must be a multiple of len */ static inline void tb_invalidate_phys_page_fast(target_ulong start, int len) { PageDesc *p; int offset, b; #if 0 if (1) { if (loglevel) { fprintf(logfile, "modifying code at 0x%x size=%d EIP=%x PC=%08x\n", cpu_single_env->mem_write_vaddr, len, cpu_single_env->eip, cpu_single_env->eip + (long)cpu_single_env->segs[R_CS].base); } } #endif p = page_find(start >> TARGET_PAGE_BITS); if (!p) return; if (p->code_bitmap) { offset = start & ~TARGET_PAGE_MASK; b = p->code_bitmap[offset >> 3] >> (offset & 7); if (b & ((1 << len) - 1)) goto do_invalidate; } else { do_invalidate: tb_invalidate_phys_page_range(start, start + len, 1); } } #if !defined(CONFIG_SOFTMMU) static void tb_invalidate_phys_page(target_ulong addr, unsigned long pc, void *puc) { int n, current_flags, current_tb_modified; target_ulong current_pc, current_cs_base; PageDesc *p; TranslationBlock *tb, *current_tb; #ifdef TARGET_HAS_PRECISE_SMC CPUState *env = cpu_single_env; #endif addr &= TARGET_PAGE_MASK; p = page_find(addr >> TARGET_PAGE_BITS); if (!p) return; tb = p->first_tb; current_tb_modified = 0; current_tb = NULL; current_pc = 0; /* avoid warning */ current_cs_base = 0; /* avoid warning */ current_flags = 0; /* avoid warning */ #ifdef TARGET_HAS_PRECISE_SMC if (tb && pc != 0) { current_tb = tb_find_pc(pc); } #endif while (tb != NULL) { n = (long)tb & 3; tb = (TranslationBlock *)((long)tb & ~3); #ifdef TARGET_HAS_PRECISE_SMC if (current_tb == tb && !(current_tb->cflags & CF_SINGLE_INSN)) { /* If we are modifying the current TB, we must stop its execution. We could be more precise by checking that the modification is after the current PC, but it would require a specialized function to partially restore the CPU state */ current_tb_modified = 1; cpu_restore_state(current_tb, env, pc, puc); #if defined(TARGET_I386) current_flags = env->hflags; current_flags |= (env->eflags & (IOPL_MASK | TF_MASK | VM_MASK)); current_cs_base = (target_ulong)env->segs[R_CS].base; current_pc = current_cs_base + env->eip; #else #error unsupported CPU #endif } #endif /* TARGET_HAS_PRECISE_SMC */ tb_phys_invalidate(tb, addr); tb = tb->page_next[n]; } p->first_tb = NULL; #ifdef TARGET_HAS_PRECISE_SMC if (current_tb_modified) { /* we generate a block containing just the instruction modifying the memory. It will ensure that it cannot modify itself */ env->current_tb = NULL; tb_gen_code(env, current_pc, current_cs_base, current_flags, CF_SINGLE_INSN); cpu_resume_from_signal(env, puc); } #endif } #endif /* add the tb in the target page and protect it if necessary */ static inline void tb_alloc_page(TranslationBlock *tb, unsigned int n, unsigned int page_addr) { PageDesc *p; TranslationBlock *last_first_tb; tb->page_addr[n] = page_addr; p = page_find(page_addr >> TARGET_PAGE_BITS); tb->page_next[n] = p->first_tb; last_first_tb = p->first_tb; p->first_tb = (TranslationBlock *)((long)tb | n); invalidate_page_bitmap(p); #if defined(TARGET_HAS_SMC) || 1 #if defined(CONFIG_USER_ONLY) if (p->flags & PAGE_WRITE) { unsigned long host_start, host_end, addr; int prot; /* force the host page as non writable (writes will have a page fault + mprotect overhead) */ host_start = page_addr & qemu_host_page_mask; host_end = host_start + qemu_host_page_size; prot = 0; for(addr = host_start; addr < host_end; addr += TARGET_PAGE_SIZE) prot |= page_get_flags(addr); mprotect((void *)host_start, qemu_host_page_size, (prot & PAGE_BITS) & ~PAGE_WRITE); #ifdef DEBUG_TB_INVALIDATE printf("protecting code page: 0x%08lx\n", host_start); #endif p->flags &= ~PAGE_WRITE; } #else /* if some code is already present, then the pages are already protected. So we handle the case where only the first TB is allocated in a physical page */ if (!last_first_tb) { target_ulong virt_addr; virt_addr = (tb->pc & TARGET_PAGE_MASK) + (n << TARGET_PAGE_BITS); tlb_protect_code(cpu_single_env, virt_addr); } #endif #endif /* TARGET_HAS_SMC */ } /* Allocate a new translation block. Flush the translation buffer if too many translation blocks or too much generated code. */ TranslationBlock *tb_alloc(unsigned long pc) { TranslationBlock *tb; if (nb_tbs >= CODE_GEN_MAX_BLOCKS || (code_gen_ptr - code_gen_buffer) >= CODE_GEN_BUFFER_MAX_SIZE) return NULL; tb = &tbs[nb_tbs++]; tb->pc = pc; tb->cflags = 0; return tb; } /* add a new TB and link it to the physical page tables. phys_page2 is (-1) to indicate that only one page contains the TB. */ void tb_link_phys(TranslationBlock *tb, target_ulong phys_pc, target_ulong phys_page2) { unsigned int h; TranslationBlock **ptb; /* add in the physical hash table */ h = tb_phys_hash_func(phys_pc); ptb = &tb_phys_hash[h]; tb->phys_hash_next = *ptb; *ptb = tb; /* add in the page list */ tb_alloc_page(tb, 0, phys_pc & TARGET_PAGE_MASK); if (phys_page2 != -1) tb_alloc_page(tb, 1, phys_page2); else tb->page_addr[1] = -1; #ifdef DEBUG_TB_CHECK tb_page_check(); #endif } /* link the tb with the other TBs */ void tb_link(TranslationBlock *tb) { #if !defined(CONFIG_USER_ONLY) { VirtPageDesc *vp; target_ulong addr; /* save the code memory mappings (needed to invalidate the code) */ addr = tb->pc & TARGET_PAGE_MASK; vp = virt_page_find_alloc(addr >> TARGET_PAGE_BITS); #ifdef DEBUG_TLB_CHECK if (vp->valid_tag == virt_valid_tag && vp->phys_addr != tb->page_addr[0]) { printf("Error tb addr=0x%x phys=0x%x vp->phys_addr=0x%x\n", addr, tb->page_addr[0], vp->phys_addr); } #endif vp->phys_addr = tb->page_addr[0]; if (vp->valid_tag != virt_valid_tag) { vp->valid_tag = virt_valid_tag; #if !defined(CONFIG_SOFTMMU) vp->prot = 0; #endif } if (tb->page_addr[1] != -1) { addr += TARGET_PAGE_SIZE; vp = virt_page_find_alloc(addr >> TARGET_PAGE_BITS); #ifdef DEBUG_TLB_CHECK if (vp->valid_tag == virt_valid_tag && vp->phys_addr != tb->page_addr[1]) { printf("Error tb addr=0x%x phys=0x%x vp->phys_addr=0x%x\n", addr, tb->page_addr[1], vp->phys_addr); } #endif vp->phys_addr = tb->page_addr[1]; if (vp->valid_tag != virt_valid_tag) { vp->valid_tag = virt_valid_tag; #if !defined(CONFIG_SOFTMMU) vp->prot = 0; #endif } } } #endif tb->jmp_first = (TranslationBlock *)((long)tb | 2); tb->jmp_next[0] = NULL; tb->jmp_next[1] = NULL; #ifdef USE_CODE_COPY tb->cflags &= ~CF_FP_USED; if (tb->cflags & CF_TB_FP_USED) tb->cflags |= CF_FP_USED; #endif /* init original jump addresses */ if (tb->tb_next_offset[0] != 0xffff) tb_reset_jump(tb, 0); if (tb->tb_next_offset[1] != 0xffff) tb_reset_jump(tb, 1); } /* find the TB 'tb' such that tb[0].tc_ptr <= tc_ptr < tb[1].tc_ptr. Return NULL if not found */ TranslationBlock *tb_find_pc(unsigned long tc_ptr) { int m_min, m_max, m; unsigned long v; TranslationBlock *tb; if (nb_tbs <= 0) return NULL; if (tc_ptr < (unsigned long)code_gen_buffer || tc_ptr >= (unsigned long)code_gen_ptr) return NULL; /* binary search (cf Knuth) */ m_min = 0; m_max = nb_tbs - 1; while (m_min <= m_max) { m = (m_min + m_max) >> 1; tb = &tbs[m]; v = (unsigned long)tb->tc_ptr; if (v == tc_ptr) return tb; else if (tc_ptr < v) { m_max = m - 1; } else { m_min = m + 1; } } return &tbs[m_max]; } static void tb_reset_jump_recursive(TranslationBlock *tb); static inline void tb_reset_jump_recursive2(TranslationBlock *tb, int n) { TranslationBlock *tb1, *tb_next, **ptb; unsigned int n1; tb1 = tb->jmp_next[n]; if (tb1 != NULL) { /* find head of list */ for(;;) { n1 = (long)tb1 & 3; tb1 = (TranslationBlock *)((long)tb1 & ~3); if (n1 == 2) break; tb1 = tb1->jmp_next[n1]; } /* we are now sure now that tb jumps to tb1 */ tb_next = tb1; /* remove tb from the jmp_first list */ ptb = &tb_next->jmp_first; for(;;) { tb1 = *ptb; n1 = (long)tb1 & 3; tb1 = (TranslationBlock *)((long)tb1 & ~3); if (n1 == n && tb1 == tb) break; ptb = &tb1->jmp_next[n1]; } *ptb = tb->jmp_next[n]; tb->jmp_next[n] = NULL; /* suppress the jump to next tb in generated code */ tb_reset_jump(tb, n); /* suppress jumps in the tb on which we could have jumped */ tb_reset_jump_recursive(tb_next); } } static void tb_reset_jump_recursive(TranslationBlock *tb) { tb_reset_jump_recursive2(tb, 0); tb_reset_jump_recursive2(tb, 1); } static void breakpoint_invalidate(CPUState *env, target_ulong pc) { target_ulong phys_addr; phys_addr = cpu_get_phys_page_debug(env, pc); tb_invalidate_phys_page_range(phys_addr, phys_addr + 1, 0); } /* add a breakpoint. EXCP_DEBUG is returned by the CPU loop if a breakpoint is reached */ int cpu_breakpoint_insert(CPUState *env, target_ulong pc) { #if defined(TARGET_I386) || defined(TARGET_PPC) || defined(TARGET_SPARC) int i; for(i = 0; i < env->nb_breakpoints; i++) { if (env->breakpoints[i] == pc) return 0; } if (env->nb_breakpoints >= MAX_BREAKPOINTS) return -1; env->breakpoints[env->nb_breakpoints++] = pc; breakpoint_invalidate(env, pc); return 0; #else return -1; #endif } /* remove a breakpoint */ int cpu_breakpoint_remove(CPUState *env, target_ulong pc) { #if defined(TARGET_I386) || defined(TARGET_PPC) || defined(TARGET_SPARC) int i; for(i = 0; i < env->nb_breakpoints; i++) { if (env->breakpoints[i] == pc) goto found; } return -1; found: memmove(&env->breakpoints[i], &env->breakpoints[i + 1], (env->nb_breakpoints - (i + 1)) * sizeof(env->breakpoints[0])); env->nb_breakpoints--; breakpoint_invalidate(env, pc); return 0; #else return -1; #endif } /* enable or disable single step mode. EXCP_DEBUG is returned by the CPU loop after each instruction */ void cpu_single_step(CPUState *env, int enabled) { #if defined(TARGET_I386) || defined(TARGET_PPC) || defined(TARGET_SPARC) if (env->singlestep_enabled != enabled) { env->singlestep_enabled = enabled; /* must flush all the translated code to avoid inconsistancies */ /* XXX: only flush what is necessary */ tb_flush(env); } #endif } /* enable or disable low levels log */ void cpu_set_log(int log_flags) { loglevel = log_flags; if (loglevel && !logfile) { logfile = fopen(logfilename, "w"); if (!logfile) { perror(logfilename); _exit(1); } #if !defined(CONFIG_SOFTMMU) /* must avoid mmap() usage of glibc by setting a buffer "by hand" */ { static uint8_t logfile_buf[4096]; setvbuf(logfile, logfile_buf, _IOLBF, sizeof(logfile_buf)); } #else setvbuf(logfile, NULL, _IOLBF, 0); #endif } } void cpu_set_log_filename(const char *filename) { logfilename = strdup(filename); } /* mask must never be zero, except for A20 change call */ void cpu_interrupt(CPUState *env, int mask) { TranslationBlock *tb; static int interrupt_lock; env->interrupt_request |= mask; /* if the cpu is currently executing code, we must unlink it and all the potentially executing TB */ tb = env->current_tb; if (tb && !testandset(&interrupt_lock)) { env->current_tb = NULL; tb_reset_jump_recursive(tb); interrupt_lock = 0; } } void cpu_reset_interrupt(CPUState *env, int mask) { env->interrupt_request &= ~mask; } CPULogItem cpu_log_items[] = { { CPU_LOG_TB_OUT_ASM, "out_asm", "show generated host assembly code for each compiled TB" }, { CPU_LOG_TB_IN_ASM, "in_asm", "show target assembly code for each compiled TB" }, { CPU_LOG_TB_OP, "op", "show micro ops for each compiled TB (only usable if 'in_asm' used)" }, #ifdef TARGET_I386 { CPU_LOG_TB_OP_OPT, "op_opt", "show micro ops after optimization for each compiled TB" }, #endif { CPU_LOG_INT, "int", "show interrupts/exceptions in short format" }, { CPU_LOG_EXEC, "exec", "show trace before each executed TB (lots of logs)" }, { CPU_LOG_TB_CPU, "cpu", "show CPU state before bloc translation" }, #ifdef TARGET_I386 { CPU_LOG_PCALL, "pcall", "show protected mode far calls/returns/exceptions" }, #endif #ifdef DEBUG_IOPORT { CPU_LOG_IOPORT, "ioport", "show all i/o ports accesses" }, #endif { 0, NULL, NULL }, }; static int cmp1(const char *s1, int n, const char *s2) { if (strlen(s2) != n) return 0; return memcmp(s1, s2, n) == 0; } /* takes a comma separated list of log masks. Return 0 if error. */ int cpu_str_to_log_mask(const char *str) { CPULogItem *item; int mask; const char *p, *p1; p = str; mask = 0; for(;;) { p1 = strchr(p, ','); if (!p1) p1 = p + strlen(p); if(cmp1(p,p1-p,"all")) { for(item = cpu_log_items; item->mask != 0; item++) { mask |= item->mask; } } else { for(item = cpu_log_items; item->mask != 0; item++) { if (cmp1(p, p1 - p, item->name)) goto found; } return 0; } found: mask |= item->mask; if (*p1 != ',') break; p = p1 + 1; } return mask; } void cpu_abort(CPUState *env, const char *fmt, ...) { va_list ap; va_start(ap, fmt); fprintf(stderr, "qemu: fatal: "); vfprintf(stderr, fmt, ap); fprintf(stderr, "\n"); #ifdef TARGET_I386 cpu_dump_state(env, stderr, fprintf, X86_DUMP_FPU | X86_DUMP_CCOP); #else cpu_dump_state(env, stderr, fprintf, 0); #endif va_end(ap); abort(); } #if !defined(CONFIG_USER_ONLY) /* NOTE: if flush_global is true, also flush global entries (not implemented yet) */ void tlb_flush(CPUState *env, int flush_global) { int i; #if defined(DEBUG_TLB) printf("tlb_flush:\n"); #endif /* must reset current TB so that interrupts cannot modify the links while we are modifying them */ env->current_tb = NULL; for(i = 0; i < CPU_TLB_SIZE; i++) { env->tlb_read[0][i].address = -1; env->tlb_write[0][i].address = -1; env->tlb_read[1][i].address = -1; env->tlb_write[1][i].address = -1; } virt_page_flush(); memset (tb_hash, 0, CODE_GEN_HASH_SIZE * sizeof (void *)); #if !defined(CONFIG_SOFTMMU) munmap((void *)MMAP_AREA_START, MMAP_AREA_END - MMAP_AREA_START); #endif } static inline void tlb_flush_entry(CPUTLBEntry *tlb_entry, target_ulong addr) { if (addr == (tlb_entry->address & (TARGET_PAGE_MASK | TLB_INVALID_MASK))) tlb_entry->address = -1; } void tlb_flush_page(CPUState *env, target_ulong addr) { int i, n; VirtPageDesc *vp; PageDesc *p; TranslationBlock *tb; #if defined(DEBUG_TLB) printf("tlb_flush_page: 0x%08x\n", addr); #endif /* must reset current TB so that interrupts cannot modify the links while we are modifying them */ env->current_tb = NULL; addr &= TARGET_PAGE_MASK; i = (addr >> TARGET_PAGE_BITS) & (CPU_TLB_SIZE - 1); tlb_flush_entry(&env->tlb_read[0][i], addr); tlb_flush_entry(&env->tlb_write[0][i], addr); tlb_flush_entry(&env->tlb_read[1][i], addr); tlb_flush_entry(&env->tlb_write[1][i], addr); /* remove from the virtual pc hash table all the TB at this virtual address */ vp = virt_page_find(addr >> TARGET_PAGE_BITS); if (vp && vp->valid_tag == virt_valid_tag) { p = page_find(vp->phys_addr >> TARGET_PAGE_BITS); if (p) { /* we remove all the links to the TBs in this virtual page */ tb = p->first_tb; while (tb != NULL) { n = (long)tb & 3; tb = (TranslationBlock *)((long)tb & ~3); if ((tb->pc & TARGET_PAGE_MASK) == addr || ((tb->pc + tb->size - 1) & TARGET_PAGE_MASK) == addr) { tb_invalidate(tb); } tb = tb->page_next[n]; } } vp->valid_tag = 0; } #if !defined(CONFIG_SOFTMMU) if (addr < MMAP_AREA_END) munmap((void *)addr, TARGET_PAGE_SIZE); #endif } static inline void tlb_protect_code1(CPUTLBEntry *tlb_entry, target_ulong addr) { if (addr == (tlb_entry->address & (TARGET_PAGE_MASK | TLB_INVALID_MASK)) && (tlb_entry->address & ~TARGET_PAGE_MASK) != IO_MEM_CODE && (tlb_entry->address & ~TARGET_PAGE_MASK) != IO_MEM_ROM) { tlb_entry->address = (tlb_entry->address & TARGET_PAGE_MASK) | IO_MEM_CODE; } } /* update the TLBs so that writes to code in the virtual page 'addr' can be detected */ static void tlb_protect_code(CPUState *env, target_ulong addr) { int i; addr &= TARGET_PAGE_MASK; i = (addr >> TARGET_PAGE_BITS) & (CPU_TLB_SIZE - 1); tlb_protect_code1(&env->tlb_write[0][i], addr); tlb_protect_code1(&env->tlb_write[1][i], addr); #if !defined(CONFIG_SOFTMMU) /* NOTE: as we generated the code for this page, it is already at least readable */ if (addr < MMAP_AREA_END) mprotect((void *)addr, TARGET_PAGE_SIZE, PROT_READ); #endif } static inline void tlb_unprotect_code2(CPUTLBEntry *tlb_entry, unsigned long phys_addr) { if ((tlb_entry->address & ~TARGET_PAGE_MASK) == IO_MEM_CODE && ((tlb_entry->address & TARGET_PAGE_MASK) + tlb_entry->addend) == phys_addr) { tlb_entry->address = (tlb_entry->address & TARGET_PAGE_MASK) | IO_MEM_NOTDIRTY; } } /* update the TLB so that writes in physical page 'phys_addr' are no longer tested self modifying code */ static void tlb_unprotect_code_phys(CPUState *env, unsigned long phys_addr, target_ulong vaddr) { int i; phys_addr &= TARGET_PAGE_MASK; phys_addr += (long)phys_ram_base; i = (vaddr >> TARGET_PAGE_BITS) & (CPU_TLB_SIZE - 1); tlb_unprotect_code2(&env->tlb_write[0][i], phys_addr); tlb_unprotect_code2(&env->tlb_write[1][i], phys_addr); } static inline void tlb_reset_dirty_range(CPUTLBEntry *tlb_entry, unsigned long start, unsigned long length) { unsigned long addr; if ((tlb_entry->address & ~TARGET_PAGE_MASK) == IO_MEM_RAM) { addr = (tlb_entry->address & TARGET_PAGE_MASK) + tlb_entry->addend; if ((addr - start) < length) { tlb_entry->address = (tlb_entry->address & TARGET_PAGE_MASK) | IO_MEM_NOTDIRTY; } } } void cpu_physical_memory_reset_dirty(target_ulong start, target_ulong end) { CPUState *env; unsigned long length, start1; int i; start &= TARGET_PAGE_MASK; end = TARGET_PAGE_ALIGN(end); length = end - start; if (length == 0) return; memset(phys_ram_dirty + (start >> TARGET_PAGE_BITS), 0, length >> TARGET_PAGE_BITS); env = cpu_single_env; /* we modify the TLB cache so that the dirty bit will be set again when accessing the range */ start1 = start + (unsigned long)phys_ram_base; for(i = 0; i < CPU_TLB_SIZE; i++) tlb_reset_dirty_range(&env->tlb_write[0][i], start1, length); for(i = 0; i < CPU_TLB_SIZE; i++) tlb_reset_dirty_range(&env->tlb_write[1][i], start1, length); #if !defined(CONFIG_SOFTMMU) /* XXX: this is expensive */ { VirtPageDesc *p; int j; target_ulong addr; for(i = 0; i < L1_SIZE; i++) { p = l1_virt_map[i]; if (p) { addr = i << (TARGET_PAGE_BITS + L2_BITS); for(j = 0; j < L2_SIZE; j++) { if (p->valid_tag == virt_valid_tag && p->phys_addr >= start && p->phys_addr < end && (p->prot & PROT_WRITE)) { if (addr < MMAP_AREA_END) { mprotect((void *)addr, TARGET_PAGE_SIZE, p->prot & ~PROT_WRITE); } } addr += TARGET_PAGE_SIZE; p++; } } } } #endif } static inline void tlb_set_dirty1(CPUTLBEntry *tlb_entry, unsigned long start) { unsigned long addr; if ((tlb_entry->address & ~TARGET_PAGE_MASK) == IO_MEM_NOTDIRTY) { addr = (tlb_entry->address & TARGET_PAGE_MASK) + tlb_entry->addend; if (addr == start) { tlb_entry->address = (tlb_entry->address & TARGET_PAGE_MASK) | IO_MEM_RAM; } } } /* update the TLB corresponding to virtual page vaddr and phys addr addr so that it is no longer dirty */ static inline void tlb_set_dirty(unsigned long addr, target_ulong vaddr) { CPUState *env = cpu_single_env; int i; phys_ram_dirty[(addr - (unsigned long)phys_ram_base) >> TARGET_PAGE_BITS] = 1; addr &= TARGET_PAGE_MASK; i = (vaddr >> TARGET_PAGE_BITS) & (CPU_TLB_SIZE - 1); tlb_set_dirty1(&env->tlb_write[0][i], addr); tlb_set_dirty1(&env->tlb_write[1][i], addr); } /* add a new TLB entry. At most one entry for a given virtual address is permitted. Return 0 if OK or 2 if the page could not be mapped (can only happen in non SOFTMMU mode for I/O pages or pages conflicting with the host address space). */ int tlb_set_page(CPUState *env, target_ulong vaddr, target_phys_addr_t paddr, int prot, int is_user, int is_softmmu) { PhysPageDesc *p; unsigned long pd; TranslationBlock *first_tb; unsigned int index; target_ulong address; unsigned long addend; int ret; p = phys_page_find(paddr >> TARGET_PAGE_BITS); first_tb = NULL; if (!p) { pd = IO_MEM_UNASSIGNED; } else { PageDesc *p1; pd = p->phys_offset; if ((pd & ~TARGET_PAGE_MASK) <= IO_MEM_ROM) { /* NOTE: we also allocate the page at this stage */ p1 = page_find_alloc(pd >> TARGET_PAGE_BITS); first_tb = p1->first_tb; } } #if defined(DEBUG_TLB) printf("tlb_set_page: vaddr=0x%08x paddr=0x%08x prot=%x u=%d c=%d smmu=%d pd=0x%08x\n", vaddr, paddr, prot, is_user, (first_tb != NULL), is_softmmu, pd); #endif ret = 0; #if !defined(CONFIG_SOFTMMU) if (is_softmmu) #endif { if ((pd & ~TARGET_PAGE_MASK) > IO_MEM_ROM) { /* IO memory case */ address = vaddr | pd; addend = paddr; } else { /* standard memory */ address = vaddr; addend = (unsigned long)phys_ram_base + (pd & TARGET_PAGE_MASK); } index = (vaddr >> 12) & (CPU_TLB_SIZE - 1); addend -= vaddr; if (prot & PAGE_READ) { env->tlb_read[is_user][index].address = address; env->tlb_read[is_user][index].addend = addend; } else { env->tlb_read[is_user][index].address = -1; env->tlb_read[is_user][index].addend = -1; } if (prot & PAGE_WRITE) { if ((pd & ~TARGET_PAGE_MASK) == IO_MEM_ROM) { /* ROM: access is ignored (same as unassigned) */ env->tlb_write[is_user][index].address = vaddr | IO_MEM_ROM; env->tlb_write[is_user][index].addend = addend; } else /* XXX: the PowerPC code seems not ready to handle self modifying code with DCBI */ #if defined(TARGET_HAS_SMC) || 1 if (first_tb) { /* if code is present, we use a specific memory handler. It works only for physical memory access */ env->tlb_write[is_user][index].address = vaddr | IO_MEM_CODE; env->tlb_write[is_user][index].addend = addend; } else #endif if ((pd & ~TARGET_PAGE_MASK) == IO_MEM_RAM && !cpu_physical_memory_is_dirty(pd)) { env->tlb_write[is_user][index].address = vaddr | IO_MEM_NOTDIRTY; env->tlb_write[is_user][index].addend = addend; } else { env->tlb_write[is_user][index].address = address; env->tlb_write[is_user][index].addend = addend; } } else { env->tlb_write[is_user][index].address = -1; env->tlb_write[is_user][index].addend = -1; } } #if !defined(CONFIG_SOFTMMU) else { if ((pd & ~TARGET_PAGE_MASK) > IO_MEM_ROM) { /* IO access: no mapping is done as it will be handled by the soft MMU */ if (!(env->hflags & HF_SOFTMMU_MASK)) ret = 2; } else { void *map_addr; if (vaddr >= MMAP_AREA_END) { ret = 2; } else { if (prot & PROT_WRITE) { if ((pd & ~TARGET_PAGE_MASK) == IO_MEM_ROM || #if defined(TARGET_HAS_SMC) || 1 first_tb || #endif ((pd & ~TARGET_PAGE_MASK) == IO_MEM_RAM && !cpu_physical_memory_is_dirty(pd))) { /* ROM: we do as if code was inside */ /* if code is present, we only map as read only and save the original mapping */ VirtPageDesc *vp; vp = virt_page_find_alloc(vaddr >> TARGET_PAGE_BITS); vp->phys_addr = pd; vp->prot = prot; vp->valid_tag = virt_valid_tag; prot &= ~PAGE_WRITE; } } map_addr = mmap((void *)vaddr, TARGET_PAGE_SIZE, prot, MAP_SHARED | MAP_FIXED, phys_ram_fd, (pd & TARGET_PAGE_MASK)); if (map_addr == MAP_FAILED) { cpu_abort(env, "mmap failed when mapped physical address 0x%08x to virtual address 0x%08x\n", paddr, vaddr); } } } } #endif return ret; } /* called from signal handler: invalidate the code and unprotect the page. Return TRUE if the fault was succesfully handled. */ int page_unprotect(unsigned long addr, unsigned long pc, void *puc) { #if !defined(CONFIG_SOFTMMU) VirtPageDesc *vp; #if defined(DEBUG_TLB) printf("page_unprotect: addr=0x%08x\n", addr); #endif addr &= TARGET_PAGE_MASK; /* if it is not mapped, no need to worry here */ if (addr >= MMAP_AREA_END) return 0; vp = virt_page_find(addr >> TARGET_PAGE_BITS); if (!vp) return 0; /* NOTE: in this case, validate_tag is _not_ tested as it validates only the code TLB */ if (vp->valid_tag != virt_valid_tag) return 0; if (!(vp->prot & PAGE_WRITE)) return 0; #if defined(DEBUG_TLB) printf("page_unprotect: addr=0x%08x phys_addr=0x%08x prot=%x\n", addr, vp->phys_addr, vp->prot); #endif if (mprotect((void *)addr, TARGET_PAGE_SIZE, vp->prot) < 0) cpu_abort(cpu_single_env, "error mprotect addr=0x%lx prot=%d\n", (unsigned long)addr, vp->prot); /* set the dirty bit */ phys_ram_dirty[vp->phys_addr >> TARGET_PAGE_BITS] = 1; /* flush the code inside */ tb_invalidate_phys_page(vp->phys_addr, pc, puc); return 1; #else return 0; #endif } #else void tlb_flush(CPUState *env, int flush_global) { } void tlb_flush_page(CPUState *env, target_ulong addr) { } int tlb_set_page(CPUState *env, target_ulong vaddr, target_phys_addr_t paddr, int prot, int is_user, int is_softmmu) { return 0; } /* dump memory mappings */ void page_dump(FILE *f) { unsigned long start, end; int i, j, prot, prot1; PageDesc *p; fprintf(f, "%-8s %-8s %-8s %s\n", "start", "end", "size", "prot"); start = -1; end = -1; prot = 0; for(i = 0; i <= L1_SIZE; i++) { if (i < L1_SIZE) p = l1_map[i]; else p = NULL; for(j = 0;j < L2_SIZE; j++) { if (!p) prot1 = 0; else prot1 = p[j].flags; if (prot1 != prot) { end = (i << (32 - L1_BITS)) | (j << TARGET_PAGE_BITS); if (start != -1) { fprintf(f, "%08lx-%08lx %08lx %c%c%c\n", start, end, end - start, prot & PAGE_READ ? 'r' : '-', prot & PAGE_WRITE ? 'w' : '-', prot & PAGE_EXEC ? 'x' : '-'); } if (prot1 != 0) start = end; else start = -1; prot = prot1; } if (!p) break; } } } int page_get_flags(unsigned long address) { PageDesc *p; p = page_find(address >> TARGET_PAGE_BITS); if (!p) return 0; return p->flags; } /* modify the flags of a page and invalidate the code if necessary. The flag PAGE_WRITE_ORG is positionned automatically depending on PAGE_WRITE */ void page_set_flags(unsigned long start, unsigned long end, int flags) { PageDesc *p; unsigned long addr; start = start & TARGET_PAGE_MASK; end = TARGET_PAGE_ALIGN(end); if (flags & PAGE_WRITE) flags |= PAGE_WRITE_ORG; spin_lock(&tb_lock); for(addr = start; addr < end; addr += TARGET_PAGE_SIZE) { p = page_find_alloc(addr >> TARGET_PAGE_BITS); /* if the write protection is set, then we invalidate the code inside */ if (!(p->flags & PAGE_WRITE) && (flags & PAGE_WRITE) && p->first_tb) { tb_invalidate_phys_page(addr, 0, NULL); } p->flags = flags; } spin_unlock(&tb_lock); } /* called from signal handler: invalidate the code and unprotect the page. Return TRUE if the fault was succesfully handled. */ int page_unprotect(unsigned long address, unsigned long pc, void *puc) { unsigned int page_index, prot, pindex; PageDesc *p, *p1; unsigned long host_start, host_end, addr; host_start = address & qemu_host_page_mask; page_index = host_start >> TARGET_PAGE_BITS; p1 = page_find(page_index); if (!p1) return 0; host_end = host_start + qemu_host_page_size; p = p1; prot = 0; for(addr = host_start;addr < host_end; addr += TARGET_PAGE_SIZE) { prot |= p->flags; p++; } /* if the page was really writable, then we change its protection back to writable */ if (prot & PAGE_WRITE_ORG) { pindex = (address - host_start) >> TARGET_PAGE_BITS; if (!(p1[pindex].flags & PAGE_WRITE)) { mprotect((void *)host_start, qemu_host_page_size, (prot & PAGE_BITS) | PAGE_WRITE); p1[pindex].flags |= PAGE_WRITE; /* and since the content will be modified, we must invalidate the corresponding translated code. */ tb_invalidate_phys_page(address, pc, puc); #ifdef DEBUG_TB_CHECK tb_invalidate_check(address); #endif return 1; } } return 0; } /* call this function when system calls directly modify a memory area */ void page_unprotect_range(uint8_t *data, unsigned long data_size) { unsigned long start, end, addr; start = (unsigned long)data; end = start + data_size; start &= TARGET_PAGE_MASK; end = TARGET_PAGE_ALIGN(end); for(addr = start; addr < end; addr += TARGET_PAGE_SIZE) { page_unprotect(addr, 0, NULL); } } static inline void tlb_set_dirty(unsigned long addr, target_ulong vaddr) { } #endif /* defined(CONFIG_USER_ONLY) */ /* register physical memory. 'size' must be a multiple of the target page size. If (phys_offset & ~TARGET_PAGE_MASK) != 0, then it is an io memory page */ void cpu_register_physical_memory(target_phys_addr_t start_addr, unsigned long size, unsigned long phys_offset) { unsigned long addr, end_addr; PhysPageDesc *p; size = (size + TARGET_PAGE_SIZE - 1) & TARGET_PAGE_MASK; end_addr = start_addr + size; for(addr = start_addr; addr != end_addr; addr += TARGET_PAGE_SIZE) { p = phys_page_find_alloc(addr >> TARGET_PAGE_BITS); p->phys_offset = phys_offset; if ((phys_offset & ~TARGET_PAGE_MASK) <= IO_MEM_ROM) phys_offset += TARGET_PAGE_SIZE; } } static uint32_t unassigned_mem_readb(void *opaque, target_phys_addr_t addr) { return 0; } static void unassigned_mem_writeb(void *opaque, target_phys_addr_t addr, uint32_t val) { } static CPUReadMemoryFunc *unassigned_mem_read[3] = { unassigned_mem_readb, unassigned_mem_readb, unassigned_mem_readb, }; static CPUWriteMemoryFunc *unassigned_mem_write[3] = { unassigned_mem_writeb, unassigned_mem_writeb, unassigned_mem_writeb, }; /* self modifying code support in soft mmu mode : writing to a page containing code comes to these functions */ static void code_mem_writeb(void *opaque, target_phys_addr_t addr, uint32_t val) { unsigned long phys_addr; phys_addr = addr - (unsigned long)phys_ram_base; #if !defined(CONFIG_USER_ONLY) tb_invalidate_phys_page_fast(phys_addr, 1); #endif stb_raw((uint8_t *)addr, val); phys_ram_dirty[phys_addr >> TARGET_PAGE_BITS] = 1; } static void code_mem_writew(void *opaque, target_phys_addr_t addr, uint32_t val) { unsigned long phys_addr; phys_addr = addr - (unsigned long)phys_ram_base; #if !defined(CONFIG_USER_ONLY) tb_invalidate_phys_page_fast(phys_addr, 2); #endif stw_raw((uint8_t *)addr, val); phys_ram_dirty[phys_addr >> TARGET_PAGE_BITS] = 1; } static void code_mem_writel(void *opaque, target_phys_addr_t addr, uint32_t val) { unsigned long phys_addr; phys_addr = addr - (unsigned long)phys_ram_base; #if !defined(CONFIG_USER_ONLY) tb_invalidate_phys_page_fast(phys_addr, 4); #endif stl_raw((uint8_t *)addr, val); phys_ram_dirty[phys_addr >> TARGET_PAGE_BITS] = 1; } static CPUReadMemoryFunc *code_mem_read[3] = { NULL, /* never used */ NULL, /* never used */ NULL, /* never used */ }; static CPUWriteMemoryFunc *code_mem_write[3] = { code_mem_writeb, code_mem_writew, code_mem_writel, }; static void notdirty_mem_writeb(void *opaque, target_phys_addr_t addr, uint32_t val) { stb_raw((uint8_t *)addr, val); tlb_set_dirty(addr, cpu_single_env->mem_write_vaddr); } static void notdirty_mem_writew(void *opaque, target_phys_addr_t addr, uint32_t val) { stw_raw((uint8_t *)addr, val); tlb_set_dirty(addr, cpu_single_env->mem_write_vaddr); } static void notdirty_mem_writel(void *opaque, target_phys_addr_t addr, uint32_t val) { stl_raw((uint8_t *)addr, val); tlb_set_dirty(addr, cpu_single_env->mem_write_vaddr); } static CPUWriteMemoryFunc *notdirty_mem_write[3] = { notdirty_mem_writeb, notdirty_mem_writew, notdirty_mem_writel, }; static void io_mem_init(void) { cpu_register_io_memory(IO_MEM_ROM >> IO_MEM_SHIFT, code_mem_read, unassigned_mem_write, NULL); cpu_register_io_memory(IO_MEM_UNASSIGNED >> IO_MEM_SHIFT, unassigned_mem_read, unassigned_mem_write, NULL); cpu_register_io_memory(IO_MEM_CODE >> IO_MEM_SHIFT, code_mem_read, code_mem_write, NULL); cpu_register_io_memory(IO_MEM_NOTDIRTY >> IO_MEM_SHIFT, code_mem_read, notdirty_mem_write, NULL); io_mem_nb = 5; /* alloc dirty bits array */ phys_ram_dirty = qemu_malloc(phys_ram_size >> TARGET_PAGE_BITS); } /* mem_read and mem_write are arrays of functions containing the function to access byte (index 0), word (index 1) and dword (index 2). All functions must be supplied. If io_index is non zero, the corresponding io zone is modified. If it is zero, a new io zone is allocated. The return value can be used with cpu_register_physical_memory(). (-1) is returned if error. */ int cpu_register_io_memory(int io_index, CPUReadMemoryFunc **mem_read, CPUWriteMemoryFunc **mem_write, void *opaque) { int i; if (io_index <= 0) { if (io_index >= IO_MEM_NB_ENTRIES) return -1; io_index = io_mem_nb++; } else { if (io_index >= IO_MEM_NB_ENTRIES) return -1; } for(i = 0;i < 3; i++) { io_mem_read[io_index][i] = mem_read[i]; io_mem_write[io_index][i] = mem_write[i]; } io_mem_opaque[io_index] = opaque; return io_index << IO_MEM_SHIFT; } /* physical memory access (slow version, mainly for debug) */ #if defined(CONFIG_USER_ONLY) void cpu_physical_memory_rw(target_phys_addr_t addr, uint8_t *buf, int len, int is_write) { int l, flags; target_ulong page; while (len > 0) { page = addr & TARGET_PAGE_MASK; l = (page + TARGET_PAGE_SIZE) - addr; if (l > len) l = len; flags = page_get_flags(page); if (!(flags & PAGE_VALID)) return; if (is_write) { if (!(flags & PAGE_WRITE)) return; memcpy((uint8_t *)addr, buf, len); } else { if (!(flags & PAGE_READ)) return; memcpy(buf, (uint8_t *)addr, len); } len -= l; buf += l; addr += l; } } #else void cpu_physical_memory_rw(target_phys_addr_t addr, uint8_t *buf, int len, int is_write) { int l, io_index; uint8_t *ptr; uint32_t val; target_phys_addr_t page; unsigned long pd; PhysPageDesc *p; while (len > 0) { page = addr & TARGET_PAGE_MASK; l = (page + TARGET_PAGE_SIZE) - addr; if (l > len) l = len; p = phys_page_find(page >> TARGET_PAGE_BITS); if (!p) { pd = IO_MEM_UNASSIGNED; } else { pd = p->phys_offset; } if (is_write) { if ((pd & ~TARGET_PAGE_MASK) != 0) { io_index = (pd >> IO_MEM_SHIFT) & (IO_MEM_NB_ENTRIES - 1); if (l >= 4 && ((addr & 3) == 0)) { /* 32 bit read access */ val = ldl_raw(buf); io_mem_write[io_index][2](io_mem_opaque[io_index], addr, val); l = 4; } else if (l >= 2 && ((addr & 1) == 0)) { /* 16 bit read access */ val = lduw_raw(buf); io_mem_write[io_index][1](io_mem_opaque[io_index], addr, val); l = 2; } else { /* 8 bit access */ val = ldub_raw(buf); io_mem_write[io_index][0](io_mem_opaque[io_index], addr, val); l = 1; } } else { unsigned long addr1; addr1 = (pd & TARGET_PAGE_MASK) + (addr & ~TARGET_PAGE_MASK); /* RAM case */ ptr = phys_ram_base + addr1; memcpy(ptr, buf, l); /* invalidate code */ tb_invalidate_phys_page_range(addr1, addr1 + l, 0); /* set dirty bit */ phys_ram_dirty[page >> TARGET_PAGE_BITS] = 1; } } else { if ((pd & ~TARGET_PAGE_MASK) > IO_MEM_ROM && (pd & ~TARGET_PAGE_MASK) != IO_MEM_CODE) { /* I/O case */ io_index = (pd >> IO_MEM_SHIFT) & (IO_MEM_NB_ENTRIES - 1); if (l >= 4 && ((addr & 3) == 0)) { /* 32 bit read access */ val = io_mem_read[io_index][2](io_mem_opaque[io_index], addr); stl_raw(buf, val); l = 4; } else if (l >= 2 && ((addr & 1) == 0)) { /* 16 bit read access */ val = io_mem_read[io_index][1](io_mem_opaque[io_index], addr); stw_raw(buf, val); l = 2; } else { /* 8 bit access */ val = io_mem_read[io_index][0](io_mem_opaque[io_index], addr); stb_raw(buf, val); l = 1; } } else { /* RAM case */ ptr = phys_ram_base + (pd & TARGET_PAGE_MASK) + (addr & ~TARGET_PAGE_MASK); memcpy(buf, ptr, l); } } len -= l; buf += l; addr += l; } } #endif /* virtual memory access for debug */ int cpu_memory_rw_debug(CPUState *env, target_ulong addr, uint8_t *buf, int len, int is_write) { int l; target_ulong page, phys_addr; while (len > 0) { page = addr & TARGET_PAGE_MASK; phys_addr = cpu_get_phys_page_debug(env, page); /* if no physical page mapped, return an error */ if (phys_addr == -1) return -1; l = (page + TARGET_PAGE_SIZE) - addr; if (l > len) l = len; cpu_physical_memory_rw(phys_addr + (addr & ~TARGET_PAGE_MASK), buf, l, is_write); len -= l; buf += l; addr += l; } return 0; } #if !defined(CONFIG_USER_ONLY) #define MMUSUFFIX _cmmu #define GETPC() NULL #define env cpu_single_env #define SOFTMMU_CODE_ACCESS #define SHIFT 0 #include "softmmu_template.h" #define SHIFT 1 #include "softmmu_template.h" #define SHIFT 2 #include "softmmu_template.h" #define SHIFT 3 #include "softmmu_template.h" #undef env #endif