linux-user/m68k-sim.c

   1 /*
   2  *  m68k simulator syscall interface
   3  *
   4  *  Copyright (c) 2005 CodeSourcery, LLC. Written by Paul Brook.
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19  */
  20
  21 #include <sys/types.h>
  22 #include <sys/stat.h>
  23 #include <errno.h>
  24 #include <fcntl.h>
  25 #include <unistd.h>
  26 #include <stdlib.h>
  27 #include <stdio.h>
  28 #include <time.h>
  29
  30 #include "qemu.h"
  31
  32 #define SYS_EXIT        1
  33 #define SYS_READ        3
  34 #define SYS_WRITE       4
  35 #define SYS_OPEN        5
  36 #define SYS_CLOSE       6
  37 #define SYS_BRK         17
  38 #define SYS_FSTAT       28
  39 #define SYS_ISATTY      29
  40 #define SYS_LSEEK       199
  41
  42 struct m86k_sim_stat {
  43     uint16_t sim_st_dev;
  44     uint16_t sim_st_ino;
  45     uint32_t sim_st_mode;
  46     uint16_t sim_st_nlink;
  47     uint16_t sim_st_uid;
  48     uint16_t sim_st_gid;
  49     uint16_t sim_st_rdev;
  50     uint32_t sim_st_size;
  51     uint32_t sim_st_atime;
  52     uint32_t sim_st_mtime;
  53     uint32_t sim_st_ctime;
  54     uint32_t sim_st_blksize;
  55     uint32_t sim_st_blocks;
  56 };
  57
  58 static inline uint32_t check_err(CPUM68KState *env, uint32_t code)
  59 {
  60   env->dregs[0] = code;
  61   if (code == (uint32_t)-1) {
  62       env->dregs[1] = errno;
  63   } else {
  64       env->dregs[1] = 0;
  65   }
  66   return code;
  67 }
  68
  69 #define SIM_O_APPEND    0x0008
  70 #define SIM_O_CREAT     0x0200
  71 #define SIM_O_TRUNC     0x0400
  72 #define SIM_O_EXCL      0x0800
  73 #define SIM_O_NONBLOCK  0x4000
  74 #define SIM_O_NOCTTY    0x8000
  75 #define SIM_O_SYNC      0x2000
  76
  77 static int translate_openflags(int flags)
  78 {
  79     int hf;
  80
  81     switch (flags & 3) {
  82     case 0: hf = O_RDONLY; break;
  83     case 1: hf = O_WRONLY; break;
  84     case 2: hf = O_RDWR; break;
  85     default: hf = O_RDWR; break;
  86     }
  87
  88     if (flags & SIM_O_APPEND) hf |= O_APPEND;
  89     if (flags & SIM_O_CREAT) hf |= O_CREAT;
  90     if (flags & SIM_O_TRUNC) hf |= O_TRUNC;
  91     if (flags & SIM_O_EXCL) hf |= O_EXCL;
  92     if (flags & SIM_O_NONBLOCK) hf |= O_NONBLOCK;
  93     if (flags & SIM_O_NOCTTY) hf |= O_NOCTTY;
  94     if (flags & SIM_O_SYNC) hf |= O_SYNC;
  95
  96     return hf;
  97 }
  98
  99 #define ARG(x) tswap32(args[x])
 100 void do_m68k_simcall(CPUM68KState *env, int nr)
 101 {
 102     uint32_t *args;
 103
 104     args = (uint32_t *)(env->aregs[7] + 4);
 105     switch (nr) {
 106     case SYS_EXIT:
 107         exit(ARG(0));
 108     case SYS_READ:
 109         check_err(env, read(ARG(0), (void *)ARG(1), ARG(2)));
 110         break;
 111     case SYS_WRITE:
 112         check_err(env, write(ARG(0), (void *)ARG(1), ARG(2)));
 113         break;
 114     case SYS_OPEN:
 115         check_err(env, open((char *)ARG(0), translate_openflags(ARG(1)),
 116                             ARG(2)));
 117         break;
 118     case SYS_CLOSE:
 119         {
 120             /* Ignore attempts to close stdin/out/err.  */
 121             int fd = ARG(0);
 122             if (fd > 2)
 123               check_err(env, close(fd));
 124             else
 125               check_err(env, 0);
 126             break;
 127         }
 128     case SYS_BRK:
 129         {
 130             int32_t ret;
 131
 132             ret = do_brk((void *)ARG(0));
 133             if (ret == -ENOMEM)
 134                 ret = -1;
 135             check_err(env, ret);
 136         }
 137         break;
 138     case SYS_FSTAT:
 139         {
 140             struct stat s;
 141             int rc;
 142             struct m86k_sim_stat *p;
 143             rc = check_err(env, fstat(ARG(0), &s));
 144             if (rc == 0) {
 145                 p = (struct m86k_sim_stat *)ARG(1);
 146                 p->sim_st_dev = tswap16(s.st_dev);
 147                 p->sim_st_ino = tswap16(s.st_ino);
 148                 p->sim_st_mode = tswap32(s.st_mode);
 149                 p->sim_st_nlink = tswap16(s.st_nlink);
 150                 p->sim_st_uid = tswap16(s.st_uid);
 151                 p->sim_st_gid = tswap16(s.st_gid);
 152                 p->sim_st_rdev = tswap16(s.st_rdev);
 153                 p->sim_st_size = tswap32(s.st_size);
 154                 p->sim_st_atime = tswap32(s.st_atime);
 155                 p->sim_st_mtime = tswap32(s.st_mtime);
 156                 p->sim_st_ctime = tswap32(s.st_ctime);
 157                 p->sim_st_blksize = tswap32(s.st_blksize);
 158                 p->sim_st_blocks = tswap32(s.st_blocks);
 159             }
 160         }
 161         break;
 162     case SYS_ISATTY:
 163         check_err(env, isatty(ARG(0)));
 164         break;
 165     case SYS_LSEEK:
 166         check_err(env, lseek(ARG(0), (int32_t)ARG(1), ARG(2)));
 167         break;
 168     default:
 169         cpu_abort(env, "Unsupported m68k sim syscall %d\n", nr);
 170     }
 171 }