main.c

qemu性能直逼VMware的仿真器QEMU 的模擬速度約為實機的 25％；約為 Bochs 的 60 倍。Plex86、User-Mode-Linux、VMware 和 Virtual PC 則比

/*
 *  qemu user main
 *
 *  Copyright (c) 2003 Fabrice Bellard
 *  Copyright (c) 2006 Pierre d'Herbemont
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program 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 General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
#include <stdlib.h>
#include <stdio.h>
#include <stdarg.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>

#include <sys/syscall.h>
#include <sys/mman.h>

#include "qemu.h"

#define DEBUG_LOGFILE "/tmp/qemu.log"

#ifdef __APPLE__
#include <crt_externs.h>
# define environ  (*_NSGetEnviron())
#endif

#include <mach/mach_init.h>
#include <mach/vm_map.h>

const char *interp_prefix = "";

asm(".zerofill __STD_PROG_ZONE, __STD_PROG_ZONE, __std_prog_zone, 0x0dfff000");

/* XXX: on x86 MAP_GROWSDOWN only works if ESP <= address + 32, so
   we allocate a bigger stack. Need a better solution, for example
   by remapping the process stack directly at the right place */
unsigned long stack_size = 512 * 1024;

void qerror(const char *fmt, ...)
{
    va_list ap;

    va_start(ap, fmt);
    vfprintf(stderr, fmt, ap);
    va_end(ap);
    fprintf(stderr, "\n");
    exit(1);
}

void gemu_log(const char *fmt, ...)
{
    va_list ap;

    va_start(ap, fmt);
    vfprintf(stderr, fmt, ap);
    va_end(ap);
}

void cpu_outb(CPUState *env, int addr, int val)
{
    fprintf(stderr, "outb: port=0x%04x, data=%02x\n", addr, val);
}

void cpu_outw(CPUState *env, int addr, int val)
{
    fprintf(stderr, "outw: port=0x%04x, data=%04x\n", addr, val);
}

void cpu_outl(CPUState *env, int addr, int val)
{
    fprintf(stderr, "outl: port=0x%04x, data=%08x\n", addr, val);
}

int cpu_inb(CPUState *env, int addr)
{
    fprintf(stderr, "inb: port=0x%04x\n", addr);
    return 0;
}

int cpu_inw(CPUState *env, int addr)
{
    fprintf(stderr, "inw: port=0x%04x\n", addr);
    return 0;
}

int cpu_inl(CPUState *env, int addr)
{
    fprintf(stderr, "inl: port=0x%04x\n", addr);
    return 0;
}

int cpu_get_pic_interrupt(CPUState *env)
{
    return -1;
}
#ifdef TARGET_PPC

static inline uint64_t cpu_ppc_get_tb (CPUState *env)
{
    /* TO FIX */
    return 0;
}

uint32_t cpu_ppc_load_tbl (CPUState *env)
{
    return cpu_ppc_get_tb(env) & 0xFFFFFFFF;
}

uint32_t cpu_ppc_load_tbu (CPUState *env)
{
    return cpu_ppc_get_tb(env) >> 32;
}

static void cpu_ppc_store_tb (CPUState *env, uint64_t value)
{
    /* TO FIX */
}

void cpu_ppc_store_tbu (CPUState *env, uint32_t value)
{
    cpu_ppc_store_tb(env, ((uint64_t)value << 32) | cpu_ppc_load_tbl(env));
}

void cpu_ppc_store_tbl (CPUState *env, uint32_t value)
{
    cpu_ppc_store_tb(env, ((uint64_t)cpu_ppc_load_tbl(env) << 32) | value);
}

uint32_t cpu_ppc_load_decr (CPUState *env)
{
    /* TO FIX */
    return -1;
}

void cpu_ppc_store_decr (CPUState *env, uint32_t value)
{
    /* TO FIX */
}

void cpu_loop(CPUPPCState *env)
{
    int trapnr;
    uint32_t ret;
    target_siginfo_t info;

    for(;;) {
        trapnr = cpu_ppc_exec(env);
        if (trapnr != EXCP_SYSCALL_USER && trapnr != EXCP_BRANCH &&
            trapnr != EXCP_TRACE) {
            if (loglevel > 0) {
                cpu_dump_state(env, logfile, fprintf, 0);
            }
        }
        switch(trapnr) {
        case EXCP_NONE:
            break;
        case EXCP_SYSCALL_USER:
            /* system call */
            if(((int)env->gpr[0]) <= SYS_MAXSYSCALL && ((int)env->gpr[0])>0)
                ret = do_unix_syscall(env, env->gpr[0]/*, env->gpr[3], env->gpr[4],
                                      env->gpr[5], env->gpr[6], env->gpr[7],
                                      env->gpr[8], env->gpr[9], env->gpr[10]*/);
            else if(((int)env->gpr[0])<0)
                ret = do_mach_syscall(env, env->gpr[0], env->gpr[3], env->gpr[4],
                                      env->gpr[5], env->gpr[6], env->gpr[7],
                                      env->gpr[8], env->gpr[9], env->gpr[10]);
            else
                ret = do_thread_syscall(env, env->gpr[0], env->gpr[3], env->gpr[4],
                                        env->gpr[5], env->gpr[6], env->gpr[7],
                                        env->gpr[8], env->gpr[9], env->gpr[10]);

            /* Unix syscall error signaling */
            if(((int)env->gpr[0]) <= SYS_MAXSYSCALL && ((int)env->gpr[0])>0)
            {
                if( (int)ret < 0 )
                    env->nip += 0;
                else
                    env->nip += 4;
            }

            /* Return value */
            env->gpr[3] = ret;
            break;
        case EXCP_RESET:
            /* Should not happen ! */
            fprintf(stderr, "RESET asked... Stop emulation\n");
            if (loglevel)
                fprintf(logfile, "RESET asked... Stop emulation\n");
                abort();
        case EXCP_MACHINE_CHECK:
            fprintf(stderr, "Machine check exeption...  Stop emulation\n");
            if (loglevel)
                fprintf(logfile, "RESET asked... Stop emulation\n");
                info.si_signo = SIGBUS;
            info.si_errno = 0;
            info.si_code = BUS_OBJERR;
            info.si_addr = (void*)(env->nip - 4);
            queue_signal(info.si_signo, &info);
        case EXCP_DSI:
#ifndef DAR
/* To deal with multiple qemu header version as host for the darwin-user code */
# define DAR SPR_DAR
#endif
            fprintf(stderr, "Invalid data memory access: 0x%08x\n", env->spr[DAR]);
            if (loglevel) {
                fprintf(logfile, "Invalid data memory access: 0x%08x\n",
                        env->spr[DAR]);
            }
            /* Handle this via the gdb */
            gdb_handlesig (env, SIGSEGV);

            info.si_addr = (void*)env->nip;
            queue_signal(info.si_signo, &info);
            break;
        case EXCP_ISI:
            fprintf(stderr, "Invalid instruction fetch\n");
            if (loglevel)
                fprintf(logfile, "Invalid instruction fetch\n");
            /* Handle this via the gdb */
            gdb_handlesig (env, SIGSEGV);

            info.si_addr = (void*)(env->nip - 4);
            queue_signal(info.si_signo, &info);
            break;
        case EXCP_EXTERNAL:
            /* Should not happen ! */
            fprintf(stderr, "External interruption... Stop emulation\n");
            if (loglevel)
                fprintf(logfile, "External interruption... Stop emulation\n");
                abort();
        case EXCP_ALIGN:
            fprintf(stderr, "Invalid unaligned memory access\n");
            if (loglevel)
                fprintf(logfile, "Invalid unaligned memory access\n");
                info.si_signo = SIGBUS;
            info.si_errno = 0;
            info.si_code = BUS_ADRALN;
            info.si_addr = (void*)(env->nip - 4);
            queue_signal(info.si_signo, &info);
            break;
        case EXCP_PROGRAM:
            switch (env->error_code & ~0xF) {
                case EXCP_FP:
                    fprintf(stderr, "Program exception\n");
                    if (loglevel)
                        fprintf(logfile, "Program exception\n");
                        /* Set FX */
                        env->fpscr[7] |= 0x8;
                    /* Finally, update FEX */
                    if ((((env->fpscr[7] & 0x3) << 3) | (env->fpscr[6] >> 1)) &
                        ((env->fpscr[1] << 1) | (env->fpscr[0] >> 3)))
                        env->fpscr[7] |= 0x4;
                        info.si_signo = SIGFPE;
                    info.si_errno = 0;
                    switch (env->error_code & 0xF) {
                        case EXCP_FP_OX:
                            info.si_code = FPE_FLTOVF;
                            break;
                        case EXCP_FP_UX:
                            info.si_code = FPE_FLTUND;
                            break;
                        case EXCP_FP_ZX:
                        case EXCP_FP_VXZDZ:
                            info.si_code = FPE_FLTDIV;
                            break;
                        case EXCP_FP_XX:
                            info.si_code = FPE_FLTRES;
                            break;
                        case EXCP_FP_VXSOFT:
                            info.si_code = FPE_FLTINV;
                            break;
                        case EXCP_FP_VXNAN:
                        case EXCP_FP_VXISI:
                        case EXCP_FP_VXIDI:
                        case EXCP_FP_VXIMZ:
                        case EXCP_FP_VXVC:
                        case EXCP_FP_VXSQRT:
                        case EXCP_FP_VXCVI:
                            info.si_code = FPE_FLTSUB;
                            break;
                        default:
                            fprintf(stderr, "Unknown floating point exception "
                                    "(%02x)\n", env->error_code);
                            if (loglevel) {
                                fprintf(logfile, "Unknown floating point exception "
                                        "(%02x)\n", env->error_code & 0xF);
                            }
                    }
                        break;
                case EXCP_INVAL:
                    fprintf(stderr, "Invalid instruction\n");
                    if (loglevel)
                        fprintf(logfile, "Invalid instruction\n");
                        info.si_signo = SIGILL;
                    info.si_errno = 0;
                    switch (env->error_code & 0xF) {
                        case EXCP_INVAL_INVAL:
                            info.si_code = ILL_ILLOPC;
                            break;
                        case EXCP_INVAL_LSWX:
                            info.si_code = ILL_ILLOPN;
                            break;
                        case EXCP_INVAL_SPR:
                            info.si_code = ILL_PRVREG;
                            break;
                        case EXCP_INVAL_FP:
                            info.si_code = ILL_COPROC;
                            break;
                        default:
                            fprintf(stderr, "Unknown invalid operation (%02x)\n",
                                    env->error_code & 0xF);
                            if (loglevel) {
                                fprintf(logfile, "Unknown invalid operation (%02x)\n",
                                        env->error_code & 0xF);
                            }
                                info.si_code = ILL_ILLADR;
                            break;
                    }
                        /* Handle this via the gdb */
                        gdb_handlesig (env, SIGSEGV);
                    break;
                case EXCP_PRIV:
                    fprintf(stderr, "Privilege violation\n");
                    if (loglevel)
                        fprintf(logfile, "Privilege violation\n");
                        info.si_signo = SIGILL;
                    info.si_errno = 0;
                    switch (env->error_code & 0xF) {
                        case EXCP_PRIV_OPC:
                            info.si_code = ILL_PRVOPC;
                            break;
                        case EXCP_PRIV_REG:
                            info.si_code = ILL_PRVREG;
                            break;
                        default:
                            fprintf(stderr, "Unknown privilege violation (%02x)\n",
                                    env->error_code & 0xF);
                            info.si_code = ILL_PRVOPC;
                            break;
                    }
                        break;
                case EXCP_TRAP:
                    fprintf(stderr, "Tried to call a TRAP\n");
                    if (loglevel)
                        fprintf(logfile, "Tried to call a TRAP\n");
                        abort();
                default:
                    /* Should not happen ! */
                    fprintf(stderr, "Unknown program exception (%02x)\n",
                            env->error_code);
                    if (loglevel) {
                        fprintf(logfile, "Unknwon program exception (%02x)\n",
                                env->error_code);
                    }
                        abort();
            }
            info.si_addr = (void*)(env->nip - 4);
            queue_signal(info.si_signo, &info);
            break;
        case EXCP_NO_FP:
            fprintf(stderr, "No floating point allowed\n");
            if (loglevel)
                fprintf(logfile, "No floating point allowed\n");
                info.si_signo = SIGILL;
            info.si_errno = 0;
            info.si_code = ILL_COPROC;
            info.si_addr = (void*)(env->nip - 4);
            queue_signal(info.si_signo, &info);
            break;
        case EXCP_DECR:
            /* Should not happen ! */
            fprintf(stderr, "Decrementer exception\n");
            if (loglevel)
                fprintf(logfile, "Decrementer exception\n");
            abort();
        case EXCP_TRACE:
            /* Pass to gdb: we use this to trace execution */
            gdb_handlesig (env, SIGTRAP);
            break;
        case EXCP_FP_ASSIST:
            /* Should not happen ! */
            fprintf(stderr, "Floating point assist exception\n");
            if (loglevel)
                fprintf(logfile, "Floating point assist exception\n");
            abort();
        case EXCP_MTMSR:
            /* We reloaded the msr, just go on */
            if (msr_pr == 0) {
                fprintf(stderr, "Tried to go into supervisor mode !\n");
                if (loglevel)
                    fprintf(logfile, "Tried to go into supervisor mode !\n");
                abort();
            }
            break;
        case EXCP_BRANCH:
            /* We stopped because of a jump... */
            break;
        case EXCP_INTERRUPT:
            /* Don't know why this should ever happen... */
            fprintf(stderr, "EXCP_INTERRUPT\n");
            break;
        case EXCP_DEBUG:
            gdb_handlesig (env, SIGTRAP);
            break;
        default:
            fprintf(stderr, "qemu: unhandled CPU exception 0x%x - aborting\n",
                    trapnr);
            if (loglevel) {
                fprintf(logfile, "qemu: unhandled CPU exception 0x%02x - "
                        "0x%02x - aborting\n", trapnr, env->error_code);
            }
                abort();
        }
        process_pending_signals(env);
    }
}
#endif


#ifdef TARGET_I386

/***********************************************************/
/* CPUX86 core interface */

uint64_t cpu_get_tsc(CPUX86State *env)
{
    return cpu_get_real_ticks();
}

void
write_dt(void *ptr, unsigned long addr, unsigned long limit,
                     int flags)
{
    unsigned int e1, e2;
    e1 = (addr << 16) | (limit & 0xffff);
    e2 = ((addr >> 16) & 0xff) | (addr & 0xff000000) | (limit & 0x000f0000);
    e2 |= flags;
    stl((uint8_t *)ptr, e1);
    stl((uint8_t *)ptr + 4, e2);
}

static void set_gate(void *ptr, unsigned int type, unsigned int dpl,
                     unsigned long addr, unsigned int sel)
{
    unsigned int e1, e2;
    e1 = (addr & 0xffff) | (sel << 16);
    e2 = (addr & 0xffff0000) | 0x8000 | (dpl << 13) | (type << 8);