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, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include "qemu/osdep.h"
  21
  22 #include "qemu.h"
  23
  24 #define SYS_EXIT        1
  25 #define SYS_READ        3
  26 #define SYS_WRITE       4
  27 #define SYS_OPEN        5
  28 #define SYS_CLOSE       6
  29 #define SYS_BRK         17
  30 #define SYS_FSTAT       28
  31 #define SYS_ISATTY      29
  32 #define SYS_LSEEK       199
  33
  34 struct m68k_sim_stat {
  35     uint16_t sim_st_dev;
  36     uint16_t sim_st_ino;
  37     uint32_t sim_st_mode;
  38     uint16_t sim_st_nlink;
  39     uint16_t sim_st_uid;
  40     uint16_t sim_st_gid;
  41     uint16_t sim_st_rdev;
  42     uint32_t sim_st_size;
  43     uint32_t sim_st_atime;
  44     uint32_t sim_st_mtime;
  45     uint32_t sim_st_ctime;
  46     uint32_t sim_st_blksize;
  47     uint32_t sim_st_blocks;
  48 };
  49
  50 static inline uint32_t check_err(CPUM68KState *env, uint32_t code)
  51 {
  52   env->dregs[0] = code;
  53   if (code == (uint32_t)-1) {
  54       env->dregs[1] = errno;
  55   } else {
  56       env->dregs[1] = 0;
  57   }
  58   return code;
  59 }
  60
  61 #define SIM_O_APPEND    0x0008
  62 #define SIM_O_CREAT     0x0200
  63 #define SIM_O_TRUNC     0x0400
  64 #define SIM_O_EXCL      0x0800
  65 #define SIM_O_NONBLOCK  0x4000
  66 #define SIM_O_NOCTTY    0x8000
  67 #define SIM_O_SYNC      0x2000
  68
  69 static int translate_openflags(int flags)
  70 {
  71     int hf;
  72
  73     switch (flags & 3) {
  74     case 0: hf = O_RDONLY; break;
  75     case 1: hf = O_WRONLY; break;
  76     case 2: hf = O_RDWR; break;
  77     default: hf = O_RDWR; break;
  78     }
  79
  80     if (flags & SIM_O_APPEND) hf |= O_APPEND;
  81     if (flags & SIM_O_CREAT) hf |= O_CREAT;
  82     if (flags & SIM_O_TRUNC) hf |= O_TRUNC;
  83     if (flags & SIM_O_EXCL) hf |= O_EXCL;
  84     if (flags & SIM_O_NONBLOCK) hf |= O_NONBLOCK;
  85     if (flags & SIM_O_NOCTTY) hf |= O_NOCTTY;
  86     if (flags & SIM_O_SYNC) hf |= O_SYNC;
  87
  88     return hf;
  89 }
  90
  91 #define ARG(x) tswap32(args[x])
  92 void do_m68k_simcall(CPUM68KState *env, int nr)
  93 {
  94     M68kCPU *cpu = m68k_env_get_cpu(env);
  95     uint32_t *args;
  96
  97     args = (uint32_t *)(unsigned long)(env->aregs[7] + 4);
  98     switch (nr) {
  99     case SYS_EXIT:
 100         exit(ARG(0));
 101     case SYS_READ:
 102         check_err(env, read(ARG(0), (void *)(unsigned long)ARG(1), ARG(2)));
 103         break;
 104     case SYS_WRITE:
 105         check_err(env, write(ARG(0), (void *)(unsigned long)ARG(1), ARG(2)));
 106         break;
 107     case SYS_OPEN:
 108         check_err(env, open((char *)(unsigned long)ARG(0),
 109                             translate_openflags(ARG(1)), ARG(2)));
 110         break;
 111     case SYS_CLOSE:
 112         {
 113             /* Ignore attempts to close stdin/out/err.  */
 114             int fd = ARG(0);
 115             if (fd > 2)
 116               check_err(env, close(fd));
 117             else
 118               check_err(env, 0);
 119             break;
 120         }
 121     case SYS_BRK:
 122         {
 123             int32_t ret;
 124
 125             ret = do_brk((abi_ulong)ARG(0));
 126             if (ret == -ENOMEM)
 127                 ret = -1;
 128             check_err(env, ret);
 129         }
 130         break;
 131     case SYS_FSTAT:
 132         {
 133             struct stat s;
 134             int rc;
 135             struct m68k_sim_stat *p;
 136             rc = check_err(env, fstat(ARG(0), &s));
 137             if (rc == 0) {
 138                 p = (struct m68k_sim_stat *)(unsigned long)ARG(1);
 139                 p->sim_st_dev = tswap16(s.st_dev);
 140                 p->sim_st_ino = tswap16(s.st_ino);
 141                 p->sim_st_mode = tswap32(s.st_mode);
 142                 p->sim_st_nlink = tswap16(s.st_nlink);
 143                 p->sim_st_uid = tswap16(s.st_uid);
 144                 p->sim_st_gid = tswap16(s.st_gid);
 145                 p->sim_st_rdev = tswap16(s.st_rdev);
 146                 p->sim_st_size = tswap32(s.st_size);
 147                 p->sim_st_atime = tswap32(s.st_atime);
 148                 p->sim_st_mtime = tswap32(s.st_mtime);
 149                 p->sim_st_ctime = tswap32(s.st_ctime);
 150                 p->sim_st_blksize = tswap32(s.st_blksize);
 151                 p->sim_st_blocks = tswap32(s.st_blocks);
 152             }
 153         }
 154         break;
 155     case SYS_ISATTY:
 156         check_err(env, isatty(ARG(0)));
 157         break;
 158     case SYS_LSEEK:
 159         check_err(env, lseek(ARG(0), (int32_t)ARG(1), ARG(2)));
 160         break;
 161     default:
 162         cpu_abort(CPU(cpu), "Unsupported m68k sim syscall %d\n", nr);
 163     }
 164 }