Archipelago » qemu

/*

 *  emu main

 * 

 *  Copyright (c) 2003 Fabrice Bellard

 *

 *  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 <errno.h>

#include "gemu.h"

#include "i386/hsw_interp.h"

unsigned long x86_stack_size;

unsigned long stktop;

void gemu_log(const char *fmt, ...)

{

    va_list ap;

    va_start(ap, fmt);

    vfprintf(stderr, fmt, ap);

    va_end(ap);

}

/* virtual x86 CPU stuff */

extern int invoke_code16(Interp_ENV *, int, int);

extern int invoke_code32(Interp_ENV *, int);

extern char *e_print_cpuemu_regs(ENVPARAMS, int is32);

extern char *e_emu_disasm(ENVPARAMS, unsigned char *org, int is32);

extern void init_npu(void);

Interp_ENV env_global;

Interp_ENV *envp_global;

QWORD EMUtime = 0;

int CEmuStat = 0;

long instr_count;

/* who will initialize this? */

unsigned long io_bitmap[IO_BITMAP_SIZE+1];

/* debug flag, 0=disable 1..9=level */

int d_emu = 0;

unsigned long CRs[5] =

{

        0x00000013,        /* valid bits: 0xe005003f */

        0x00000000,        /* invalid */

        0x00000000,

        0x00000000,

        0x00000000

};

/*

 * DR0-3 = linear address of breakpoint 0-3

 * DR4=5 = reserved

 * DR6        b0-b3 = BP active

 *        b13   = BD

 *        b14   = BS

 *        b15   = BT

 * DR7        b0-b1 = G:L bp#0

 *        b2-b3 = G:L bp#1

 *        b4-b5 = G:L bp#2

 *        b6-b7 = G:L bp#3

 *        b8-b9 = GE:LE

 *        b13   = GD

 *        b16-19= LLRW bp#0        LL=00(1),01(2),11(4)

 *        b20-23= LLRW bp#1        RW=00(x),01(w),11(rw)

 *        b24-27= LLRW bp#2

 *        b28-31= LLRW bp#3

 */

unsigned long DRs[8] =

{

        0x00000000,

        0x00000000,

        0x00000000,

        0x00000000,

        0xffff1ff0,

        0x00000400,

        0xffff1ff0,

        0x00000400

};

unsigned long TRs[2] =

{

        0x00000000,

        0x00000000

};

void FatalAppExit(UINT wAction, LPCSTR lpText)

{

    fprintf(stderr, "Fatal error '%s' in CPU\n", lpText);

    exit(1);

}

int e_debug_check(unsigned char *PC)

{

    register unsigned long d7 = DRs[7];

    if (d7&0x03) {

        if (d7&0x30000) return 0;        /* only execute(00) bkp */

        if ((long)PC==DRs[0]) {

            e_printf("DBRK: DR0 hit at %p\n",PC);

            DRs[6] |= 1;

            return 1;

        }

    }

    if (d7&0x0c) {

        if (d7&0x300000) return 0;

        if ((long)PC==DRs[1]) {

            e_printf("DBRK: DR1 hit at %p\n",PC);

            DRs[6] |= 2;

            return 1;

        }

    }

    if (d7&0x30) {

        if (d7&0x3000000) return 0;

        if ((long)PC==DRs[2]) {

            e_printf("DBRK: DR2 hit at %p\n",PC);

            DRs[6] |= 4;

            return 1;

        }

    }

    if (d7&0xc0) {

        if (d7&0x30000000) return 0;

        if ((long)PC==DRs[3]) {

            e_printf("DBRK: DR3 hit at %p\n",PC);

            DRs[6] |= 8;

            return 1;

        }

    }

    return 0;

}

/* Debug stuff */

void logstr(unsigned long mask, const char *fmt,...) 

{

    va_list ap;

    va_start(ap, fmt);

    vfprintf(stderr, fmt, ap);

    va_end(ap);

}

/* unconditional message into debug log and stderr */

#undef error

void error(const char *fmt, ...)

{

    va_list ap;

    va_start(ap, fmt);

    vfprintf(stderr, fmt, ap);

    va_end(ap);

    exit(1);

}

int PortIO(DWORD port, DWORD value, UINT size, BOOL is_write)

{

    fprintf(stderr, "IO: %s port=0x%lx value=0x%lx size=%d",

            is_write ? "write" : "read", port, value, size);

    return value;

}

void LogProcName(WORD wSel, WORD wOff, WORD wAction)

{

}

void INT_handler(int num, void *env)

{

  fprintf(stderr, "EM86: int %d\n", num);

}

/***********************************************************/

/* XXX: currently we use LDT entries */

#define __USER_CS        (0x23|4)

#define __USER_DS        (0x2B|4)

void usage(void)

{

    printf("gemu version 0.1, Copyright (c) 2003 Fabrice Bellard\n"

           "usage: gemu program [arguments...]\n"

           "Linux x86 emulator\n"

           );

    exit(1);

}

int main(int argc, char **argv)

{

    const char *filename;

    struct target_pt_regs regs1, *regs = &regs1;

    struct image_info info1, *info = &info1;

    Interp_ENV *env;

    if (argc <= 1)

        usage();

    filename = argv[1];

    /* Zero out regs */

    memset(regs, 0, sizeof(struct target_pt_regs));

    /* Zero out image_info */

    memset(info, 0, sizeof(struct image_info));

    if(elf_exec(filename, argv+1, environ, regs, info) != 0) {

        printf("Error loading %s\n", filename);

        exit(1);

    }

#if 0

    printf("start_brk   0x%08lx\n" , info->start_brk);

    printf("end_code    0x%08lx\n" , info->end_code);

    printf("start_code  0x%08lx\n" , info->start_code);

    printf("end_data    0x%08lx\n" , info->end_data);

    printf("start_stack 0x%08lx\n" , info->start_stack);

    printf("brk         0x%08lx\n" , info->brk);

    printf("esp         0x%08lx\n" , regs->esp);

    printf("eip         0x%08lx\n" , regs->eip);

#endif

    target_set_brk((char *)info->brk);

    syscall_init();

    env = &env_global;

    envp_global = env;

    memset(env, 0, sizeof(Interp_ENV));

    env->rax.e   = regs->eax;

    env->rbx.e   = regs->ebx;

    env->rcx.e   = regs->ecx;

    env->rdx.e   = regs->edx;

    env->rsi.esi = regs->esi;

    env->rdi.edi = regs->edi;

    env->rbp.ebp = regs->ebp;

    env->rsp.esp = regs->esp;

    env->cs.cs   = __USER_CS;

    env->ds.ds   = __USER_DS;

    env->es.es   = __USER_DS;

    env->ss.ss   = __USER_DS;

    env->fs.fs   = __USER_DS;

    env->gs.gs   = __USER_DS;

    env->trans_addr = regs->eip;

    LDT[__USER_CS >> 3].w86Flags = DF_PRESENT | DF_PAGES | DF_32;

    LDT[__USER_CS >> 3].dwSelLimit = 0xfffff;

    LDT[__USER_CS >> 3].lpSelBase = NULL;

    LDT[__USER_DS >> 3].w86Flags = DF_PRESENT | DF_PAGES | DF_32;

    LDT[__USER_DS >> 3].dwSelLimit = 0xfffff;

    LDT[__USER_DS >> 3].lpSelBase = NULL;

    init_npu();

    for(;;) {

        int err;

        uint8_t *pc;

        err = invoke_code32(env, -1);

        env->trans_addr = env->return_addr;

        pc = env->seg_regs[0] + env->trans_addr;

        switch(err) {

        case EXCP0D_GPF:

            if (pc[0] == 0xcd && pc[1] == 0x80) {

                /* syscall */

                env->trans_addr += 2;

                env->rax.e = do_syscall(env->rax.e, 

                                        env->rbx.e,

                                        env->rcx.e,

                                        env->rdx.e,

                                        env->rsi.esi,

                                        env->rdi.edi,

                                        env->rbp.ebp);

            } else {

                goto trap_error;

            }

            break;

        default:

        trap_error:

            fprintf(stderr, "GEMU: Unknown error %d, aborting\n", err);

#ifndef NO_TRACE_MSGS

            d_emu = 9;

            fprintf(stderr, "%s\n%s\n",

                    e_print_cpuemu_regs(env, 1), 

                    e_emu_disasm(env,pc,1));

#endif

            abort();

        }

    }

    return 0;

}