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/*
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* i386 helpers (without register variable usage)
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*
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* Copyright (c) 2003 Fabrice Bellard
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <stdarg.h> |
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#include <stdlib.h> |
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#include <stdio.h> |
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#include <string.h> |
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#include <inttypes.h> |
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#include <signal.h> |
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#include <assert.h> |
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#include "cpu.h" |
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#include "exec-all.h" |
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//#define DEBUG_MMU
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#ifdef USE_CODE_COPY
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#include <asm/ldt.h> |
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#include <linux/unistd.h> |
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#include <linux/version.h> |
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_syscall3(int, modify_ldt, int, func, void *, ptr, unsigned long, bytecount) |
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#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 5, 66) |
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#define modify_ldt_ldt_s user_desc
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#endif
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#endif /* USE_CODE_COPY */ |
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CPUX86State *cpu_x86_init(void)
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{ |
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CPUX86State *env; |
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static int inited; |
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cpu_exec_init(); |
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env = malloc(sizeof(CPUX86State));
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if (!env)
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return NULL; |
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memset(env, 0, sizeof(CPUX86State)); |
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/* init various static tables */
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if (!inited) {
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inited = 1;
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optimize_flags_init(); |
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} |
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#ifdef USE_CODE_COPY
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/* testing code for code copy case */
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{ |
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struct modify_ldt_ldt_s ldt;
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ldt.entry_number = 1;
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ldt.base_addr = (unsigned long)env; |
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ldt.limit = (sizeof(CPUState) + 0xfff) >> 12; |
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ldt.seg_32bit = 1;
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ldt.contents = MODIFY_LDT_CONTENTS_DATA; |
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ldt.read_exec_only = 0;
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ldt.limit_in_pages = 1;
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ldt.seg_not_present = 0;
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ldt.useable = 1;
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modify_ldt(1, &ldt, sizeof(ldt)); /* write ldt entry */ |
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asm volatile ("movl %0, %%fs" : : "r" ((1 << 3) | 7)); |
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cpu_single_env = env; |
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} |
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#endif
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cpu_reset(env); |
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return env;
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} |
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/* NOTE: must be called outside the CPU execute loop */
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void cpu_reset(CPUX86State *env)
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{ |
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int i;
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memset(env, 0, offsetof(CPUX86State, breakpoints));
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tlb_flush(env, 1);
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/* init to reset state */
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#ifdef CONFIG_SOFTMMU
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env->hflags |= HF_SOFTMMU_MASK; |
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#endif
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cpu_x86_update_cr0(env, 0x60000010);
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env->a20_mask = 0xffffffff;
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env->idt.limit = 0xffff;
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env->gdt.limit = 0xffff;
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env->ldt.limit = 0xffff;
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env->ldt.flags = DESC_P_MASK; |
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env->tr.limit = 0xffff;
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env->tr.flags = DESC_P_MASK; |
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cpu_x86_load_seg_cache(env, R_CS, 0xf000, (uint8_t *)0xffff0000, 0xffff, 0); |
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cpu_x86_load_seg_cache(env, R_DS, 0, NULL, 0xffff, 0); |
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cpu_x86_load_seg_cache(env, R_ES, 0, NULL, 0xffff, 0); |
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cpu_x86_load_seg_cache(env, R_SS, 0, NULL, 0xffff, 0); |
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cpu_x86_load_seg_cache(env, R_FS, 0, NULL, 0xffff, 0); |
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cpu_x86_load_seg_cache(env, R_GS, 0, NULL, 0xffff, 0); |
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env->eip = 0xfff0;
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env->regs[R_EDX] = 0x600; /* indicate P6 processor */ |
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env->eflags = 0x2;
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/* FPU init */
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for(i = 0;i < 8; i++) |
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env->fptags[i] = 1;
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env->fpuc = 0x37f;
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} |
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void cpu_x86_close(CPUX86State *env)
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{ |
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free(env); |
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} |
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/***********************************************************/
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/* x86 debug */
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static const char *cc_op_str[] = { |
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"DYNAMIC",
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"EFLAGS",
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"MULB",
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"MULW",
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"MULL",
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"ADDB",
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"ADDW",
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"ADDL",
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"ADCB",
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"ADCW",
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"ADCL",
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"SUBB",
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"SUBW",
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"SUBL",
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"SBBB",
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"SBBW",
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"SBBL",
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"LOGICB",
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"LOGICW",
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"LOGICL",
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"INCB",
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"INCW",
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"INCL",
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"DECB",
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"DECW",
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"DECL",
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"SHLB",
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"SHLW",
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"SHLL",
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"SARB",
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"SARW",
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"SARL",
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}; |
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void cpu_x86_dump_state(CPUX86State *env, FILE *f, int flags) |
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{ |
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int eflags, i;
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char cc_op_name[32]; |
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static const char *seg_name[6] = { "ES", "CS", "SS", "DS", "FS", "GS" }; |
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eflags = env->eflags; |
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fprintf(f, "EAX=%08x EBX=%08x ECX=%08x EDX=%08x\n"
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"ESI=%08x EDI=%08x EBP=%08x ESP=%08x\n"
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"EIP=%08x EFL=%08x [%c%c%c%c%c%c%c] CPL=%d II=%d A20=%d\n",
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env->regs[R_EAX], env->regs[R_EBX], env->regs[R_ECX], env->regs[R_EDX], |
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env->regs[R_ESI], env->regs[R_EDI], env->regs[R_EBP], env->regs[R_ESP], |
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env->eip, eflags, |
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eflags & DF_MASK ? 'D' : '-', |
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eflags & CC_O ? 'O' : '-', |
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eflags & CC_S ? 'S' : '-', |
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eflags & CC_Z ? 'Z' : '-', |
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eflags & CC_A ? 'A' : '-', |
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eflags & CC_P ? 'P' : '-', |
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eflags & CC_C ? 'C' : '-', |
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env->hflags & HF_CPL_MASK, |
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(env->hflags >> HF_INHIBIT_IRQ_SHIFT) & 1,
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(env->a20_mask >> 20) & 1); |
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for(i = 0; i < 6; i++) { |
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SegmentCache *sc = &env->segs[i]; |
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fprintf(f, "%s =%04x %08x %08x %08x\n",
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seg_name[i], |
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sc->selector, |
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(int)sc->base,
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sc->limit, |
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sc->flags); |
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} |
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fprintf(f, "LDT=%04x %08x %08x %08x\n",
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env->ldt.selector, |
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(int)env->ldt.base,
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env->ldt.limit, |
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env->ldt.flags); |
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fprintf(f, "TR =%04x %08x %08x %08x\n",
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env->tr.selector, |
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(int)env->tr.base,
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env->tr.limit, |
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env->tr.flags); |
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fprintf(f, "GDT= %08x %08x\n",
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(int)env->gdt.base, env->gdt.limit);
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fprintf(f, "IDT= %08x %08x\n",
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(int)env->idt.base, env->idt.limit);
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fprintf(f, "CR0=%08x CR2=%08x CR3=%08x CR4=%08x\n",
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env->cr[0], env->cr[2], env->cr[3], env->cr[4]); |
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if (flags & X86_DUMP_CCOP) {
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if ((unsigned)env->cc_op < CC_OP_NB) |
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snprintf(cc_op_name, sizeof(cc_op_name), "%s", cc_op_str[env->cc_op]); |
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else
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snprintf(cc_op_name, sizeof(cc_op_name), "[%d]", env->cc_op); |
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fprintf(f, "CCS=%08x CCD=%08x CCO=%-8s\n",
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env->cc_src, env->cc_dst, cc_op_name); |
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} |
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if (flags & X86_DUMP_FPU) {
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fprintf(f, "ST0=%f ST1=%f ST2=%f ST3=%f\n",
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(double)env->fpregs[0], |
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(double)env->fpregs[1], |
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(double)env->fpregs[2], |
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(double)env->fpregs[3]); |
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fprintf(f, "ST4=%f ST5=%f ST6=%f ST7=%f\n",
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(double)env->fpregs[4], |
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(double)env->fpregs[5], |
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(double)env->fpregs[7], |
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(double)env->fpregs[8]); |
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} |
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} |
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/***********************************************************/
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/* x86 mmu */
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/* XXX: add PGE support */
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void cpu_x86_set_a20(CPUX86State *env, int a20_state) |
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{ |
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a20_state = (a20_state != 0);
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if (a20_state != ((env->a20_mask >> 20) & 1)) { |
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#if defined(DEBUG_MMU)
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printf("A20 update: a20=%d\n", a20_state);
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#endif
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/* if the cpu is currently executing code, we must unlink it and
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all the potentially executing TB */
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cpu_interrupt(env, CPU_INTERRUPT_EXITTB); |
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/* when a20 is changed, all the MMU mappings are invalid, so
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we must flush everything */
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tlb_flush(env, 1);
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env->a20_mask = 0xffefffff | (a20_state << 20); |
261 |
} |
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} |
263 |
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void cpu_x86_update_cr0(CPUX86State *env, uint32_t new_cr0)
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{ |
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int pe_state;
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#if defined(DEBUG_MMU)
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printf("CR0 update: CR0=0x%08x\n", new_cr0);
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#endif
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if ((new_cr0 & (CR0_PG_MASK | CR0_WP_MASK | CR0_PE_MASK)) !=
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(env->cr[0] & (CR0_PG_MASK | CR0_WP_MASK | CR0_PE_MASK))) {
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tlb_flush(env, 1);
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} |
275 |
env->cr[0] = new_cr0 | CR0_ET_MASK;
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/* update PE flag in hidden flags */
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pe_state = (env->cr[0] & CR0_PE_MASK);
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env->hflags = (env->hflags & ~HF_PE_MASK) | (pe_state << HF_PE_SHIFT); |
280 |
/* ensure that ADDSEG is always set in real mode */
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env->hflags |= ((pe_state ^ 1) << HF_ADDSEG_SHIFT);
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/* update FPU flags */
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env->hflags = (env->hflags & ~(HF_MP_MASK | HF_EM_MASK | HF_TS_MASK)) | |
284 |
((new_cr0 << (HF_MP_SHIFT - 1)) & (HF_MP_MASK | HF_EM_MASK | HF_TS_MASK));
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} |
286 |
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287 |
void cpu_x86_update_cr3(CPUX86State *env, uint32_t new_cr3)
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{ |
289 |
env->cr[3] = new_cr3;
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if (env->cr[0] & CR0_PG_MASK) { |
291 |
#if defined(DEBUG_MMU)
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printf("CR3 update: CR3=%08x\n", new_cr3);
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#endif
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tlb_flush(env, 0);
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} |
296 |
} |
297 |
|
298 |
void cpu_x86_update_cr4(CPUX86State *env, uint32_t new_cr4)
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{ |
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#if defined(DEBUG_MMU)
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printf("CR4 update: CR4=%08x\n", env->cr[4]); |
302 |
#endif
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if ((new_cr4 & (CR4_PGE_MASK | CR4_PAE_MASK | CR4_PSE_MASK)) !=
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304 |
(env->cr[4] & (CR4_PGE_MASK | CR4_PAE_MASK | CR4_PSE_MASK))) {
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305 |
tlb_flush(env, 1);
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306 |
} |
307 |
env->cr[4] = new_cr4;
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308 |
} |
309 |
|
310 |
/* XXX: also flush 4MB pages */
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311 |
void cpu_x86_flush_tlb(CPUX86State *env, uint32_t addr)
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312 |
{ |
313 |
tlb_flush_page(env, addr); |
314 |
} |
315 |
|
316 |
/* return value:
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317 |
-1 = cannot handle fault
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318 |
0 = nothing more to do
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319 |
1 = generate PF fault
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320 |
2 = soft MMU activation required for this block
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321 |
*/
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322 |
int cpu_x86_handle_mmu_fault(CPUX86State *env, uint32_t addr,
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323 |
int is_write, int is_user, int is_softmmu) |
324 |
{ |
325 |
uint8_t *pde_ptr, *pte_ptr; |
326 |
uint32_t pde, pte, virt_addr, ptep; |
327 |
int error_code, is_dirty, prot, page_size, ret;
|
328 |
unsigned long paddr, vaddr, page_offset; |
329 |
|
330 |
#if defined(DEBUG_MMU)
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331 |
printf("MMU fault: addr=0x%08x w=%d u=%d eip=%08x\n",
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332 |
addr, is_write, is_user, env->eip); |
333 |
#endif
|
334 |
|
335 |
if (env->user_mode_only) {
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336 |
/* user mode only emulation */
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337 |
error_code = 0;
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338 |
goto do_fault;
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339 |
} |
340 |
|
341 |
if (!(env->cr[0] & CR0_PG_MASK)) { |
342 |
pte = addr; |
343 |
virt_addr = addr & TARGET_PAGE_MASK; |
344 |
prot = PAGE_READ | PAGE_WRITE; |
345 |
page_size = 4096;
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346 |
goto do_mapping;
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347 |
} |
348 |
|
349 |
/* page directory entry */
|
350 |
pde_ptr = phys_ram_base + |
351 |
(((env->cr[3] & ~0xfff) + ((addr >> 20) & ~3)) & env->a20_mask); |
352 |
pde = ldl_raw(pde_ptr); |
353 |
if (!(pde & PG_PRESENT_MASK)) {
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354 |
error_code = 0;
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355 |
goto do_fault;
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356 |
} |
357 |
/* if PSE bit is set, then we use a 4MB page */
|
358 |
if ((pde & PG_PSE_MASK) && (env->cr[4] & CR4_PSE_MASK)) { |
359 |
if (is_user) {
|
360 |
if (!(pde & PG_USER_MASK))
|
361 |
goto do_fault_protect;
|
362 |
if (is_write && !(pde & PG_RW_MASK))
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363 |
goto do_fault_protect;
|
364 |
} else {
|
365 |
if ((env->cr[0] & CR0_WP_MASK) && |
366 |
is_write && !(pde & PG_RW_MASK)) |
367 |
goto do_fault_protect;
|
368 |
} |
369 |
is_dirty = is_write && !(pde & PG_DIRTY_MASK); |
370 |
if (!(pde & PG_ACCESSED_MASK) || is_dirty) {
|
371 |
pde |= PG_ACCESSED_MASK; |
372 |
if (is_dirty)
|
373 |
pde |= PG_DIRTY_MASK; |
374 |
stl_raw(pde_ptr, pde); |
375 |
} |
376 |
|
377 |
pte = pde & ~0x003ff000; /* align to 4MB */ |
378 |
ptep = pte; |
379 |
page_size = 4096 * 1024; |
380 |
virt_addr = addr & ~0x003fffff;
|
381 |
} else {
|
382 |
if (!(pde & PG_ACCESSED_MASK)) {
|
383 |
pde |= PG_ACCESSED_MASK; |
384 |
stl_raw(pde_ptr, pde); |
385 |
} |
386 |
|
387 |
/* page directory entry */
|
388 |
pte_ptr = phys_ram_base + |
389 |
(((pde & ~0xfff) + ((addr >> 10) & 0xffc)) & env->a20_mask); |
390 |
pte = ldl_raw(pte_ptr); |
391 |
if (!(pte & PG_PRESENT_MASK)) {
|
392 |
error_code = 0;
|
393 |
goto do_fault;
|
394 |
} |
395 |
/* combine pde and pte user and rw protections */
|
396 |
ptep = pte & pde; |
397 |
if (is_user) {
|
398 |
if (!(ptep & PG_USER_MASK))
|
399 |
goto do_fault_protect;
|
400 |
if (is_write && !(ptep & PG_RW_MASK))
|
401 |
goto do_fault_protect;
|
402 |
} else {
|
403 |
if ((env->cr[0] & CR0_WP_MASK) && |
404 |
is_write && !(ptep & PG_RW_MASK)) |
405 |
goto do_fault_protect;
|
406 |
} |
407 |
is_dirty = is_write && !(pte & PG_DIRTY_MASK); |
408 |
if (!(pte & PG_ACCESSED_MASK) || is_dirty) {
|
409 |
pte |= PG_ACCESSED_MASK; |
410 |
if (is_dirty)
|
411 |
pte |= PG_DIRTY_MASK; |
412 |
stl_raw(pte_ptr, pte); |
413 |
} |
414 |
page_size = 4096;
|
415 |
virt_addr = addr & ~0xfff;
|
416 |
} |
417 |
|
418 |
/* the page can be put in the TLB */
|
419 |
prot = PAGE_READ; |
420 |
if (pte & PG_DIRTY_MASK) {
|
421 |
/* only set write access if already dirty... otherwise wait
|
422 |
for dirty access */
|
423 |
if (is_user) {
|
424 |
if (ptep & PG_RW_MASK)
|
425 |
prot |= PAGE_WRITE; |
426 |
} else {
|
427 |
if (!(env->cr[0] & CR0_WP_MASK) || |
428 |
(ptep & PG_RW_MASK)) |
429 |
prot |= PAGE_WRITE; |
430 |
} |
431 |
} |
432 |
|
433 |
do_mapping:
|
434 |
pte = pte & env->a20_mask; |
435 |
|
436 |
/* Even if 4MB pages, we map only one 4KB page in the cache to
|
437 |
avoid filling it too fast */
|
438 |
page_offset = (addr & TARGET_PAGE_MASK) & (page_size - 1);
|
439 |
paddr = (pte & TARGET_PAGE_MASK) + page_offset; |
440 |
vaddr = virt_addr + page_offset; |
441 |
|
442 |
ret = tlb_set_page(env, vaddr, paddr, prot, is_user, is_softmmu); |
443 |
return ret;
|
444 |
do_fault_protect:
|
445 |
error_code = PG_ERROR_P_MASK; |
446 |
do_fault:
|
447 |
env->cr[2] = addr;
|
448 |
env->error_code = (is_write << PG_ERROR_W_BIT) | error_code; |
449 |
if (is_user)
|
450 |
env->error_code |= PG_ERROR_U_MASK; |
451 |
return 1; |
452 |
} |
453 |
|
454 |
#if defined(CONFIG_USER_ONLY)
|
455 |
target_ulong cpu_get_phys_page_debug(CPUState *env, target_ulong addr) |
456 |
{ |
457 |
return addr;
|
458 |
} |
459 |
#else
|
460 |
target_ulong cpu_get_phys_page_debug(CPUState *env, target_ulong addr) |
461 |
{ |
462 |
uint8_t *pde_ptr, *pte_ptr; |
463 |
uint32_t pde, pte, paddr, page_offset, page_size; |
464 |
|
465 |
if (!(env->cr[0] & CR0_PG_MASK)) { |
466 |
pte = addr; |
467 |
page_size = 4096;
|
468 |
} else {
|
469 |
/* page directory entry */
|
470 |
pde_ptr = phys_ram_base + |
471 |
(((env->cr[3] & ~0xfff) + ((addr >> 20) & ~3)) & env->a20_mask); |
472 |
pde = ldl_raw(pde_ptr); |
473 |
if (!(pde & PG_PRESENT_MASK))
|
474 |
return -1; |
475 |
if ((pde & PG_PSE_MASK) && (env->cr[4] & CR4_PSE_MASK)) { |
476 |
pte = pde & ~0x003ff000; /* align to 4MB */ |
477 |
page_size = 4096 * 1024; |
478 |
} else {
|
479 |
/* page directory entry */
|
480 |
pte_ptr = phys_ram_base + |
481 |
(((pde & ~0xfff) + ((addr >> 10) & 0xffc)) & env->a20_mask); |
482 |
pte = ldl_raw(pte_ptr); |
483 |
if (!(pte & PG_PRESENT_MASK))
|
484 |
return -1; |
485 |
page_size = 4096;
|
486 |
} |
487 |
} |
488 |
pte = pte & env->a20_mask; |
489 |
page_offset = (addr & TARGET_PAGE_MASK) & (page_size - 1);
|
490 |
paddr = (pte & TARGET_PAGE_MASK) + page_offset; |
491 |
return paddr;
|
492 |
} |
493 |
#endif
|
494 |
|
495 |
#if defined(USE_CODE_COPY)
|
496 |
struct fpstate {
|
497 |
uint16_t fpuc; |
498 |
uint16_t dummy1; |
499 |
uint16_t fpus; |
500 |
uint16_t dummy2; |
501 |
uint16_t fptag; |
502 |
uint16_t dummy3; |
503 |
|
504 |
uint32_t fpip; |
505 |
uint32_t fpcs; |
506 |
uint32_t fpoo; |
507 |
uint32_t fpos; |
508 |
uint8_t fpregs1[8 * 10]; |
509 |
}; |
510 |
|
511 |
void restore_native_fp_state(CPUState *env)
|
512 |
{ |
513 |
int fptag, i, j;
|
514 |
struct fpstate fp1, *fp = &fp1;
|
515 |
|
516 |
fp->fpuc = env->fpuc; |
517 |
fp->fpus = (env->fpus & ~0x3800) | (env->fpstt & 0x7) << 11; |
518 |
fptag = 0;
|
519 |
for (i=7; i>=0; i--) { |
520 |
fptag <<= 2;
|
521 |
if (env->fptags[i]) {
|
522 |
fptag |= 3;
|
523 |
} else {
|
524 |
/* the FPU automatically computes it */
|
525 |
} |
526 |
} |
527 |
fp->fptag = fptag; |
528 |
j = env->fpstt; |
529 |
for(i = 0;i < 8; i++) { |
530 |
memcpy(&fp->fpregs1[i * 10], &env->fpregs[j], 10); |
531 |
j = (j + 1) & 7; |
532 |
} |
533 |
asm volatile ("frstor %0" : "=m" (*fp)); |
534 |
env->native_fp_regs = 1;
|
535 |
} |
536 |
|
537 |
void save_native_fp_state(CPUState *env)
|
538 |
{ |
539 |
int fptag, i, j;
|
540 |
uint16_t fpuc; |
541 |
struct fpstate fp1, *fp = &fp1;
|
542 |
|
543 |
asm volatile ("fsave %0" : : "m" (*fp)); |
544 |
env->fpuc = fp->fpuc; |
545 |
env->fpstt = (fp->fpus >> 11) & 7; |
546 |
env->fpus = fp->fpus & ~0x3800;
|
547 |
fptag = fp->fptag; |
548 |
for(i = 0;i < 8; i++) { |
549 |
env->fptags[i] = ((fptag & 3) == 3); |
550 |
fptag >>= 2;
|
551 |
} |
552 |
j = env->fpstt; |
553 |
for(i = 0;i < 8; i++) { |
554 |
memcpy(&env->fpregs[j], &fp->fpregs1[i * 10], 10); |
555 |
j = (j + 1) & 7; |
556 |
} |
557 |
/* we must restore the default rounding state */
|
558 |
/* XXX: we do not restore the exception state */
|
559 |
fpuc = 0x037f | (env->fpuc & (3 << 10)); |
560 |
asm volatile("fldcw %0" : : "m" (fpuc)); |
561 |
env->native_fp_regs = 0;
|
562 |
} |
563 |
#endif
|