Archipelago » qemu

/*

 *  m68k simulator syscall interface

 *

 *  Copyright (c) 2005 CodeSourcery, LLC. Written by Paul Brook.

 *

 *  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 <sys/types.h>

#include <sys/stat.h>

#include <errno.h>

#include <fcntl.h>

#include <unistd.h>

#include <stdlib.h>

#include <stdio.h>

#include <time.h>

#include "qemu.h"

#define SYS_EXIT        1

#define SYS_READ        3

#define SYS_WRITE       4

#define SYS_OPEN        5

#define SYS_CLOSE       6

#define SYS_BRK         17

#define SYS_FSTAT       28

#define SYS_ISATTY      29

#define SYS_LSEEK       199

struct m86k_sim_stat {

    uint16_t sim_st_dev;

    uint16_t sim_st_ino;

    uint32_t sim_st_mode;

    uint16_t sim_st_nlink;

    uint16_t sim_st_uid;

    uint16_t sim_st_gid;

    uint16_t sim_st_rdev;

    uint32_t sim_st_size;

    uint32_t sim_st_atime;

    uint32_t sim_st_mtime;

    uint32_t sim_st_ctime;

    uint32_t sim_st_blksize;

    uint32_t sim_st_blocks;

};

static inline uint32_t check_err(CPUM68KState *env, uint32_t code)

{

  env->dregs[0] = code;

  if (code == (uint32_t)-1) {

      env->dregs[1] = errno;

  } else {

      env->dregs[1] = 0;

  }

  return code;

}

#define SIM_O_APPEND    0x0008

#define SIM_O_CREAT     0x0200

#define SIM_O_TRUNC     0x0400

#define SIM_O_EXCL      0x0800

#define SIM_O_NONBLOCK  0x4000

#define SIM_O_NOCTTY    0x8000

#define SIM_O_SYNC      0x2000

static int translate_openflags(int flags)

{

    int hf;

    switch (flags & 3) {

    case 0: hf = O_RDONLY; break;

    case 1: hf = O_WRONLY; break;

    case 2: hf = O_RDWR; break;

    default: hf = O_RDWR; break;

    }

    if (flags & SIM_O_APPEND) hf |= O_APPEND;

    if (flags & SIM_O_CREAT) hf |= O_CREAT;

    if (flags & SIM_O_TRUNC) hf |= O_TRUNC;

    if (flags & SIM_O_EXCL) hf |= O_EXCL;

    if (flags & SIM_O_NONBLOCK) hf |= O_NONBLOCK;

    if (flags & SIM_O_NOCTTY) hf |= O_NOCTTY;

    if (flags & SIM_O_SYNC) hf |= O_SYNC;

    return hf;

}

#define ARG(x) tswap32(args[x])

void do_m68k_simcall(CPUM68KState *env, int nr)

{

    uint32_t *args;

    args = (uint32_t *)(env->aregs[7] + 4);

    switch (nr) {

    case SYS_EXIT:

        exit(ARG(0));

    case SYS_READ:

        check_err(env, read(ARG(0), (void *)ARG(1), ARG(2)));

        break;

    case SYS_WRITE:

        check_err(env, write(ARG(0), (void *)ARG(1), ARG(2)));

        break;

    case SYS_OPEN:

        check_err(env, open((char *)ARG(0), translate_openflags(ARG(1)),

                            ARG(2)));

        break;

    case SYS_CLOSE:

        {

            /* Ignore attempts to close stdin/out/err.  */

            int fd = ARG(0);

            if (fd > 2)

              check_err(env, close(fd));

            else

              check_err(env, 0);

            break;

        }

    case SYS_BRK:

        {

            int32_t ret;

            ret = do_brk((void *)ARG(0));

            if (ret == -ENOMEM)

                ret = -1;

            check_err(env, ret);

        }

        break;

    case SYS_FSTAT:

        {

            struct stat s;

            int rc;

            struct m86k_sim_stat *p;

            rc = check_err(env, fstat(ARG(0), &s));

            if (rc == 0) {

                p = (struct m86k_sim_stat *)ARG(1);

                p->sim_st_dev = tswap16(s.st_dev);

                p->sim_st_ino = tswap16(s.st_ino);

                p->sim_st_mode = tswap32(s.st_mode);

                p->sim_st_nlink = tswap16(s.st_nlink);

                p->sim_st_uid = tswap16(s.st_uid);

                p->sim_st_gid = tswap16(s.st_gid);

                p->sim_st_rdev = tswap16(s.st_rdev);

                p->sim_st_size = tswap32(s.st_size);

                p->sim_st_atime = tswap32(s.st_atime);

                p->sim_st_mtime = tswap32(s.st_mtime);

                p->sim_st_ctime = tswap32(s.st_ctime);

                p->sim_st_blksize = tswap32(s.st_blksize);

                p->sim_st_blocks = tswap32(s.st_blocks);

            }

        }

        break;

    case SYS_ISATTY:

        check_err(env, isatty(ARG(0)));

        break;

    case SYS_LSEEK:

        check_err(env, lseek(ARG(0), (int32_t)ARG(1), ARG(2)));

        break;

    default:

        cpu_abort(env, "Unsupported m68k sim syscall %d\n", nr);

    }

}