/* * 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 #include #include #include #include #include #include #include #include "cpu.h" #include "exec-all.h" //#define DEBUG_MMU CPUX86State *cpu_x86_init(void) { CPUX86State *env; int i; static int inited; cpu_exec_init(); env = malloc(sizeof(CPUX86State)); if (!env) return NULL; memset(env, 0, sizeof(CPUX86State)); /* basic FPU init */ for(i = 0;i < 8; i++) env->fptags[i] = 1; env->fpuc = 0x37f; /* flags setup : we activate the IRQs by default as in user mode */ env->eflags = 0x2 | IF_MASK; tlb_flush(env); #ifdef CONFIG_SOFTMMU env->hflags |= HF_SOFTMMU_MASK; #endif /* init various static tables */ if (!inited) { inited = 1; optimize_flags_init(); } return env; } 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\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); 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) strcpy(cc_op_name, 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 */ /* called when cr3 or PG bit are modified */ static int last_pg_state = -1; static uint32_t a20_mask; int a20_enabled; void cpu_x86_set_a20(CPUX86State *env, int a20_state) { a20_state = (a20_state != 0); if (a20_state != a20_enabled) { #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, 0); /* when a20 is changed, all the MMU mappings are invalid, so we must flush everything */ tlb_flush(env); a20_enabled = a20_state; if (a20_enabled) a20_mask = 0xffffffff; else a20_mask = 0xffefffff; } } void cpu_x86_update_cr0(CPUX86State *env) { int pg_state, pe_state; #if defined(DEBUG_MMU) printf("CR0 update: CR0=0x%08x\n", env->cr[0]); #endif pg_state = env->cr[0] & CR0_PG_MASK; if (pg_state != last_pg_state) { tlb_flush(env); last_pg_state = pg_state; } /* 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); } void cpu_x86_update_cr3(CPUX86State *env) { if (env->cr[0] & CR0_PG_MASK) { #if defined(DEBUG_MMU) printf("CR3 update: CR3=%08x\n", env->cr[3]); #endif tlb_flush(env); } } void cpu_x86_init_mmu(CPUX86State *env) { a20_enabled = 1; a20_mask = 0xffffffff; last_pg_state = -1; cpu_x86_update_cr0(env); } /* 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; 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 = PROT_READ | PROT_WRITE; page_size = 4096; goto do_mapping; } /* page directory entry */ pde_ptr = phys_ram_base + (((env->cr[3] & ~0xfff) + ((addr >> 20) & ~3)) & a20_mask); pde = ldl_raw(pde_ptr); if (!(pde & PG_PRESENT_MASK)) { error_code = 0; goto do_fault; } 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) && (pde & PG_USER_MASK) && is_write && !(pde & PG_RW_MASK)) goto do_fault_protect; } /* if PSE bit is set, then we use a 4MB page */ if ((pde & PG_PSE_MASK) && (env->cr[4] & CR4_PSE_MASK)) { is_dirty = is_write && !(pde & PG_DIRTY_MASK); if (!(pde & PG_ACCESSED_MASK)) { pde |= PG_ACCESSED_MASK; if (is_dirty) pde |= PG_DIRTY_MASK; stl_raw(pde_ptr, pde); } pte = pde & ~0x003ff000; /* align to 4MB */ 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)) & a20_mask); pte = ldl_raw(pte_ptr); if (!(pte & PG_PRESENT_MASK)) { error_code = 0; goto do_fault; } if (is_user) { if (!(pte & PG_USER_MASK)) goto do_fault_protect; if (is_write && !(pte & PG_RW_MASK)) goto do_fault_protect; } else { if ((env->cr[0] & CR0_WP_MASK) && (pte & PG_USER_MASK) && is_write && !(pte & 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 = PROT_READ; if (pte & PG_DIRTY_MASK) { /* only set write access if already dirty... otherwise wait for dirty access */ if (is_user) { if (pte & PG_RW_MASK) prot |= PROT_WRITE; } else { if (!(env->cr[0] & CR0_WP_MASK) || !(pte & PG_USER_MASK) || (pte & PG_RW_MASK)) prot |= PROT_WRITE; } } do_mapping: pte = pte & 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; }