| /* |
| * i386 helpers (without register variable usage) |
| * |
| * 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 <stdarg.h> |
| #include <stdlib.h> |
| #include <stdio.h> |
| #include <string.h> |
| #include <inttypes.h> |
| #include <signal.h> |
| #include <assert.h> |
| |
| #include "cpu.h" |
| #include "exec-all.h" |
| |
| //#define DEBUG_MMU |
| |
| #ifdef USE_CODE_COPY |
| #include <asm/ldt.h> |
| #include <linux/unistd.h> |
| #include <linux/version.h> |
| |
| _syscall3(int, modify_ldt, int, func, void *, ptr, unsigned long, bytecount) |
| |
| #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 5, 66) |
| #define modify_ldt_ldt_s user_desc |
| #endif |
| #endif /* USE_CODE_COPY */ |
| |
| CPUX86State *cpu_x86_init(void) |
| { |
| CPUX86State *env; |
| static int inited; |
| |
| cpu_exec_init(); |
| |
| env = malloc(sizeof(CPUX86State)); |
| if (!env) |
| return NULL; |
| memset(env, 0, sizeof(CPUX86State)); |
| /* init various static tables */ |
| if (!inited) { |
| inited = 1; |
| optimize_flags_init(); |
| } |
| #ifdef USE_CODE_COPY |
| /* testing code for code copy case */ |
| { |
| struct modify_ldt_ldt_s ldt; |
| |
| ldt.entry_number = 1; |
| ldt.base_addr = (unsigned long)env; |
| ldt.limit = (sizeof(CPUState) + 0xfff) >> 12; |
| ldt.seg_32bit = 1; |
| ldt.contents = MODIFY_LDT_CONTENTS_DATA; |
| ldt.read_exec_only = 0; |
| ldt.limit_in_pages = 1; |
| ldt.seg_not_present = 0; |
| ldt.useable = 1; |
| modify_ldt(1, &ldt, sizeof(ldt)); /* write ldt entry */ |
| |
| asm volatile ("movl %0, %%fs" : : "r" ((1 << 3) | 7)); |
| } |
| #endif |
| cpu_single_env = env; |
| cpu_reset(env); |
| return env; |
| } |
| |
| /* NOTE: must be called outside the CPU execute loop */ |
| void cpu_reset(CPUX86State *env) |
| { |
| int i; |
| |
| memset(env, 0, offsetof(CPUX86State, breakpoints)); |
| |
| tlb_flush(env, 1); |
| |
| /* init to reset state */ |
| |
| #ifdef CONFIG_SOFTMMU |
| env->hflags |= HF_SOFTMMU_MASK; |
| #endif |
| |
| cpu_x86_update_cr0(env, 0x60000010); |
| env->a20_mask = 0xffffffff; |
| |
| env->idt.limit = 0xffff; |
| env->gdt.limit = 0xffff; |
| env->ldt.limit = 0xffff; |
| env->ldt.flags = DESC_P_MASK; |
| env->tr.limit = 0xffff; |
| env->tr.flags = DESC_P_MASK; |
| |
| cpu_x86_load_seg_cache(env, R_CS, 0xf000, (uint8_t *)0xffff0000, 0xffff, 0); |
| cpu_x86_load_seg_cache(env, R_DS, 0, NULL, 0xffff, 0); |
| cpu_x86_load_seg_cache(env, R_ES, 0, NULL, 0xffff, 0); |
| cpu_x86_load_seg_cache(env, R_SS, 0, NULL, 0xffff, 0); |
| cpu_x86_load_seg_cache(env, R_FS, 0, NULL, 0xffff, 0); |
| cpu_x86_load_seg_cache(env, R_GS, 0, NULL, 0xffff, 0); |
| |
| env->eip = 0xfff0; |
| env->regs[R_EDX] = 0x600; /* indicate P6 processor */ |
| |
| env->eflags = 0x2; |
| |
| /* FPU init */ |
| for(i = 0;i < 8; i++) |
| env->fptags[i] = 1; |
| env->fpuc = 0x37f; |
| } |
| |
| void cpu_x86_close(CPUX86State *env) |
| { |
| free(env); |
| } |
| |
| /***********************************************************/ |
| /* x86 debug */ |
| |
| static const char *cc_op_str[] = { |
| "DYNAMIC", |
| "EFLAGS", |
| "MULB", |
| "MULW", |
| "MULL", |
| "ADDB", |
| "ADDW", |
| "ADDL", |
| "ADCB", |
| "ADCW", |
| "ADCL", |
| "SUBB", |
| "SUBW", |
| "SUBL", |
| "SBBB", |
| "SBBW", |
| "SBBL", |
| "LOGICB", |
| "LOGICW", |
| "LOGICL", |
| "INCB", |
| "INCW", |
| "INCL", |
| "DECB", |
| "DECW", |
| "DECL", |
| "SHLB", |
| "SHLW", |
| "SHLL", |
| "SARB", |
| "SARW", |
| "SARL", |
| }; |
| |
| void cpu_x86_dump_state(CPUX86State *env, FILE *f, int flags) |
| { |
| int eflags, i; |
| char cc_op_name[32]; |
| static const char *seg_name[6] = { "ES", "CS", "SS", "DS", "FS", "GS" }; |
| |
| eflags = env->eflags; |
| fprintf(f, "EAX=%08x EBX=%08x ECX=%08x EDX=%08x\n" |
| "ESI=%08x EDI=%08x EBP=%08x ESP=%08x\n" |
| "EIP=%08x EFL=%08x [%c%c%c%c%c%c%c] CPL=%d II=%d A20=%d\n", |
| env->regs[R_EAX], env->regs[R_EBX], env->regs[R_ECX], env->regs[R_EDX], |
| env->regs[R_ESI], env->regs[R_EDI], env->regs[R_EBP], env->regs[R_ESP], |
| env->eip, eflags, |
| eflags & DF_MASK ? 'D' : '-', |
| eflags & CC_O ? 'O' : '-', |
| eflags & CC_S ? 'S' : '-', |
| eflags & CC_Z ? 'Z' : '-', |
| eflags & CC_A ? 'A' : '-', |
| eflags & CC_P ? 'P' : '-', |
| eflags & CC_C ? 'C' : '-', |
| env->hflags & HF_CPL_MASK, |
| (env->hflags >> HF_INHIBIT_IRQ_SHIFT) & 1, |
| (env->a20_mask >> 20) & 1); |
| for(i = 0; i < 6; i++) { |
| SegmentCache *sc = &env->segs[i]; |
| fprintf(f, "%s =%04x %08x %08x %08x\n", |
| seg_name[i], |
| sc->selector, |
| (int)sc->base, |
| sc->limit, |
| sc->flags); |
| } |
| fprintf(f, "LDT=%04x %08x %08x %08x\n", |
| env->ldt.selector, |
| (int)env->ldt.base, |
| env->ldt.limit, |
| env->ldt.flags); |
| fprintf(f, "TR =%04x %08x %08x %08x\n", |
| env->tr.selector, |
| (int)env->tr.base, |
| env->tr.limit, |
| env->tr.flags); |
| fprintf(f, "GDT= %08x %08x\n", |
| (int)env->gdt.base, env->gdt.limit); |
| fprintf(f, "IDT= %08x %08x\n", |
| (int)env->idt.base, env->idt.limit); |
| fprintf(f, "CR0=%08x CR2=%08x CR3=%08x CR4=%08x\n", |
| env->cr[0], env->cr[2], env->cr[3], env->cr[4]); |
| |
| if (flags & X86_DUMP_CCOP) { |
| if ((unsigned)env->cc_op < CC_OP_NB) |
| snprintf(cc_op_name, sizeof(cc_op_name), "%s", cc_op_str[env->cc_op]); |
| else |
| snprintf(cc_op_name, sizeof(cc_op_name), "[%d]", env->cc_op); |
| fprintf(f, "CCS=%08x CCD=%08x CCO=%-8s\n", |
| env->cc_src, env->cc_dst, cc_op_name); |
| } |
| if (flags & X86_DUMP_FPU) { |
| fprintf(f, "ST0=%f ST1=%f ST2=%f ST3=%f\n", |
| (double)env->fpregs[0], |
| (double)env->fpregs[1], |
| (double)env->fpregs[2], |
| (double)env->fpregs[3]); |
| fprintf(f, "ST4=%f ST5=%f ST6=%f ST7=%f\n", |
| (double)env->fpregs[4], |
| (double)env->fpregs[5], |
| (double)env->fpregs[7], |
| (double)env->fpregs[8]); |
| } |
| } |
| |
| /***********************************************************/ |
| /* x86 mmu */ |
| /* XXX: add PGE support */ |
| |
| void cpu_x86_set_a20(CPUX86State *env, int a20_state) |
| { |
| a20_state = (a20_state != 0); |
| if (a20_state != ((env->a20_mask >> 20) & 1)) { |
| #if defined(DEBUG_MMU) |
| printf("A20 update: a20=%d\n", a20_state); |
| #endif |
| /* if the cpu is currently executing code, we must unlink it and |
| all the potentially executing TB */ |
| cpu_interrupt(env, CPU_INTERRUPT_EXITTB); |
| |
| /* when a20 is changed, all the MMU mappings are invalid, so |
| we must flush everything */ |
| tlb_flush(env, 1); |
| env->a20_mask = 0xffefffff | (a20_state << 20); |
| } |
| } |
| |
| void cpu_x86_update_cr0(CPUX86State *env, uint32_t new_cr0) |
| { |
| int pe_state; |
| |
| #if defined(DEBUG_MMU) |
| printf("CR0 update: CR0=0x%08x\n", new_cr0); |
| #endif |
| if ((new_cr0 & (CR0_PG_MASK | CR0_WP_MASK | CR0_PE_MASK)) != |
| (env->cr[0] & (CR0_PG_MASK | CR0_WP_MASK | CR0_PE_MASK))) { |
| tlb_flush(env, 1); |
| } |
| env->cr[0] = new_cr0 | CR0_ET_MASK; |
| |
| /* update PE flag in hidden flags */ |
| pe_state = (env->cr[0] & CR0_PE_MASK); |
| env->hflags = (env->hflags & ~HF_PE_MASK) | (pe_state << HF_PE_SHIFT); |
| /* ensure that ADDSEG is always set in real mode */ |
| env->hflags |= ((pe_state ^ 1) << HF_ADDSEG_SHIFT); |
| /* update FPU flags */ |
| env->hflags = (env->hflags & ~(HF_MP_MASK | HF_EM_MASK | HF_TS_MASK)) | |
| ((new_cr0 << (HF_MP_SHIFT - 1)) & (HF_MP_MASK | HF_EM_MASK | HF_TS_MASK)); |
| } |
| |
| void cpu_x86_update_cr3(CPUX86State *env, uint32_t new_cr3) |
| { |
| env->cr[3] = new_cr3; |
| if (env->cr[0] & CR0_PG_MASK) { |
| #if defined(DEBUG_MMU) |
| printf("CR3 update: CR3=%08x\n", new_cr3); |
| #endif |
| tlb_flush(env, 0); |
| } |
| } |
| |
| void cpu_x86_update_cr4(CPUX86State *env, uint32_t new_cr4) |
| { |
| #if defined(DEBUG_MMU) |
| printf("CR4 update: CR4=%08x\n", env->cr[4]); |
| #endif |
| if ((new_cr4 & (CR4_PGE_MASK | CR4_PAE_MASK | CR4_PSE_MASK)) != |
| (env->cr[4] & (CR4_PGE_MASK | CR4_PAE_MASK | CR4_PSE_MASK))) { |
| tlb_flush(env, 1); |
| } |
| env->cr[4] = new_cr4; |
| } |
| |
| /* XXX: also flush 4MB pages */ |
| void cpu_x86_flush_tlb(CPUX86State *env, uint32_t addr) |
| { |
| tlb_flush_page(env, addr); |
| } |
| |
| /* return value: |
| -1 = cannot handle fault |
| 0 = nothing more to do |
| 1 = generate PF fault |
| 2 = soft MMU activation required for this block |
| */ |
| int cpu_x86_handle_mmu_fault(CPUX86State *env, uint32_t addr, |
| int is_write, int is_user, int is_softmmu) |
| { |
| uint8_t *pde_ptr, *pte_ptr; |
| uint32_t pde, pte, virt_addr, ptep; |
| int error_code, is_dirty, prot, page_size, ret; |
| unsigned long paddr, vaddr, page_offset; |
| |
| #if defined(DEBUG_MMU) |
| printf("MMU fault: addr=0x%08x w=%d u=%d eip=%08x\n", |
| addr, is_write, is_user, env->eip); |
| #endif |
| |
| if (env->user_mode_only) { |
| /* user mode only emulation */ |
| error_code = 0; |
| goto do_fault; |
| } |
| |
| if (!(env->cr[0] & CR0_PG_MASK)) { |
| pte = addr; |
| virt_addr = addr & TARGET_PAGE_MASK; |
| prot = PAGE_READ | PAGE_WRITE; |
| page_size = 4096; |
| goto do_mapping; |
| } |
| |
| /* page directory entry */ |
| pde_ptr = phys_ram_base + |
| (((env->cr[3] & ~0xfff) + ((addr >> 20) & ~3)) & env->a20_mask); |
| pde = ldl_raw(pde_ptr); |
| if (!(pde & PG_PRESENT_MASK)) { |
| error_code = 0; |
| goto do_fault; |
| } |
| /* if PSE bit is set, then we use a 4MB page */ |
| if ((pde & PG_PSE_MASK) && (env->cr[4] & CR4_PSE_MASK)) { |
| if (is_user) { |
| if (!(pde & PG_USER_MASK)) |
| goto do_fault_protect; |
| if (is_write && !(pde & PG_RW_MASK)) |
| goto do_fault_protect; |
| } else { |
| if ((env->cr[0] & CR0_WP_MASK) && |
| is_write && !(pde & PG_RW_MASK)) |
| goto do_fault_protect; |
| } |
| is_dirty = is_write && !(pde & PG_DIRTY_MASK); |
| if (!(pde & PG_ACCESSED_MASK) || is_dirty) { |
| pde |= PG_ACCESSED_MASK; |
| if (is_dirty) |
| pde |= PG_DIRTY_MASK; |
| stl_raw(pde_ptr, pde); |
| } |
| |
| pte = pde & ~0x003ff000; /* align to 4MB */ |
| ptep = pte; |
| page_size = 4096 * 1024; |
| virt_addr = addr & ~0x003fffff; |
| } else { |
| if (!(pde & PG_ACCESSED_MASK)) { |
| pde |= PG_ACCESSED_MASK; |
| stl_raw(pde_ptr, pde); |
| } |
| |
| /* page directory entry */ |
| pte_ptr = phys_ram_base + |
| (((pde & ~0xfff) + ((addr >> 10) & 0xffc)) & env->a20_mask); |
| pte = ldl_raw(pte_ptr); |
| if (!(pte & PG_PRESENT_MASK)) { |
| error_code = 0; |
| goto do_fault; |
| } |
| /* combine pde and pte user and rw protections */ |
| ptep = pte & pde; |
| if (is_user) { |
| if (!(ptep & PG_USER_MASK)) |
| goto do_fault_protect; |
| if (is_write && !(ptep & PG_RW_MASK)) |
| goto do_fault_protect; |
| } else { |
| if ((env->cr[0] & CR0_WP_MASK) && |
| is_write && !(ptep & PG_RW_MASK)) |
| goto do_fault_protect; |
| } |
| is_dirty = is_write && !(pte & PG_DIRTY_MASK); |
| if (!(pte & PG_ACCESSED_MASK) || is_dirty) { |
| pte |= PG_ACCESSED_MASK; |
| if (is_dirty) |
| pte |= PG_DIRTY_MASK; |
| stl_raw(pte_ptr, pte); |
| } |
| page_size = 4096; |
| virt_addr = addr & ~0xfff; |
| } |
| |
| /* the page can be put in the TLB */ |
| prot = PAGE_READ; |
| if (pte & PG_DIRTY_MASK) { |
| /* only set write access if already dirty... otherwise wait |
| for dirty access */ |
| if (is_user) { |
| if (ptep & PG_RW_MASK) |
| prot |= PAGE_WRITE; |
| } else { |
| if (!(env->cr[0] & CR0_WP_MASK) || |
| (ptep & PG_RW_MASK)) |
| prot |= PAGE_WRITE; |
| } |
| } |
| |
| do_mapping: |
| pte = pte & env->a20_mask; |
| |
| /* Even if 4MB pages, we map only one 4KB page in the cache to |
| avoid filling it too fast */ |
| page_offset = (addr & TARGET_PAGE_MASK) & (page_size - 1); |
| paddr = (pte & TARGET_PAGE_MASK) + page_offset; |
| vaddr = virt_addr + page_offset; |
| |
| ret = tlb_set_page(env, vaddr, paddr, prot, is_user, is_softmmu); |
| return ret; |
| do_fault_protect: |
| error_code = PG_ERROR_P_MASK; |
| do_fault: |
| env->cr[2] = addr; |
| env->error_code = (is_write << PG_ERROR_W_BIT) | error_code; |
| if (is_user) |
| env->error_code |= PG_ERROR_U_MASK; |
| return 1; |
| } |
| |
| #if defined(CONFIG_USER_ONLY) |
| target_ulong cpu_get_phys_page_debug(CPUState *env, target_ulong addr) |
| { |
| return addr; |
| } |
| #else |
| target_ulong cpu_get_phys_page_debug(CPUState *env, target_ulong addr) |
| { |
| uint8_t *pde_ptr, *pte_ptr; |
| uint32_t pde, pte, paddr, page_offset, page_size; |
| |
| if (!(env->cr[0] & CR0_PG_MASK)) { |
| pte = addr; |
| page_size = 4096; |
| } else { |
| /* page directory entry */ |
| pde_ptr = phys_ram_base + |
| (((env->cr[3] & ~0xfff) + ((addr >> 20) & ~3)) & env->a20_mask); |
| pde = ldl_raw(pde_ptr); |
| if (!(pde & PG_PRESENT_MASK)) |
| return -1; |
| if ((pde & PG_PSE_MASK) && (env->cr[4] & CR4_PSE_MASK)) { |
| pte = pde & ~0x003ff000; /* align to 4MB */ |
| page_size = 4096 * 1024; |
| } else { |
| /* page directory entry */ |
| pte_ptr = phys_ram_base + |
| (((pde & ~0xfff) + ((addr >> 10) & 0xffc)) & env->a20_mask); |
| pte = ldl_raw(pte_ptr); |
| if (!(pte & PG_PRESENT_MASK)) |
| return -1; |
| page_size = 4096; |
| } |
| } |
| pte = pte & env->a20_mask; |
| page_offset = (addr & TARGET_PAGE_MASK) & (page_size - 1); |
| paddr = (pte & TARGET_PAGE_MASK) + page_offset; |
| return paddr; |
| } |
| #endif |
| |
| #if defined(USE_CODE_COPY) |
| struct fpstate { |
| uint16_t fpuc; |
| uint16_t dummy1; |
| uint16_t fpus; |
| uint16_t dummy2; |
| uint16_t fptag; |
| uint16_t dummy3; |
| |
| uint32_t fpip; |
| uint32_t fpcs; |
| uint32_t fpoo; |
| uint32_t fpos; |
| uint8_t fpregs1[8 * 10]; |
| }; |
| |
| void restore_native_fp_state(CPUState *env) |
| { |
| int fptag, i, j; |
| struct fpstate fp1, *fp = &fp1; |
| |
| fp->fpuc = env->fpuc; |
| fp->fpus = (env->fpus & ~0x3800) | (env->fpstt & 0x7) << 11; |
| fptag = 0; |
| for (i=7; i>=0; i--) { |
| fptag <<= 2; |
| if (env->fptags[i]) { |
| fptag |= 3; |
| } else { |
| /* the FPU automatically computes it */ |
| } |
| } |
| fp->fptag = fptag; |
| j = env->fpstt; |
| for(i = 0;i < 8; i++) { |
| memcpy(&fp->fpregs1[i * 10], &env->fpregs[j], 10); |
| j = (j + 1) & 7; |
| } |
| asm volatile ("frstor %0" : "=m" (*fp)); |
| env->native_fp_regs = 1; |
| } |
| |
| void save_native_fp_state(CPUState *env) |
| { |
| int fptag, i, j; |
| uint16_t fpuc; |
| struct fpstate fp1, *fp = &fp1; |
| |
| asm volatile ("fsave %0" : : "m" (*fp)); |
| env->fpuc = fp->fpuc; |
| env->fpstt = (fp->fpus >> 11) & 7; |
| env->fpus = fp->fpus & ~0x3800; |
| fptag = fp->fptag; |
| for(i = 0;i < 8; i++) { |
| env->fptags[i] = ((fptag & 3) == 3); |
| fptag >>= 2; |
| } |
| j = env->fpstt; |
| for(i = 0;i < 8; i++) { |
| memcpy(&env->fpregs[j], &fp->fpregs1[i * 10], 10); |
| j = (j + 1) & 7; |
| } |
| /* we must restore the default rounding state */ |
| /* XXX: we do not restore the exception state */ |
| fpuc = 0x037f | (env->fpuc & (3 << 10)); |
| asm volatile("fldcw %0" : : "m" (fpuc)); |
| env->native_fp_regs = 0; |
| } |
| #endif |
