m68k-semi.c

   1 /*
   2  *  m68k/ColdFire Semihosting syscall interface
   3  *
   4  *  Copyright (c) 2005-2007 CodeSourcery.
   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 <sys/time.h>
  29 #include <time.h>
  30
  31 #include "cpu.h"
  32 #if defined(CONFIG_USER_ONLY)
  33 #include "qemu.h"
  34 #define SEMIHOSTING_HEAP_SIZE (128 * 1024 * 1024)
  35 #else
  36 #include "vl.h"
  37 #include "softmmu-semi.h"
  38 #endif
  39
  40 #define HOSTED_EXIT  0
  41 #define HOSTED_INIT_SIM 1
  42 #define HOSTED_OPEN 2
  43 #define HOSTED_CLOSE 3
  44 #define HOSTED_READ 4
  45 #define HOSTED_WRITE 5
  46 #define HOSTED_LSEEK 6
  47 #define HOSTED_RENAME 7
  48 #define HOSTED_UNLINK 8
  49 #define HOSTED_STAT 9
  50 #define HOSTED_FSTAT 10
  51 #define HOSTED_GETTIMEOFDAY 11
  52 #define HOSTED_ISATTY 12
  53 #define HOSTED_SYSTEM 13
  54
  55 typedef uint32_t gdb_mode_t;
  56 typedef uint32_t gdb_time_t;
  57
  58 struct m68k_gdb_stat {
  59   uint32_t    gdb_st_dev;     /* device */
  60   uint32_t    gdb_st_ino;     /* inode */
  61   gdb_mode_t  gdb_st_mode;    /* protection */
  62   uint32_t    gdb_st_nlink;   /* number of hard links */
  63   uint32_t    gdb_st_uid;     /* user ID of owner */
  64   uint32_t    gdb_st_gid;     /* group ID of owner */
  65   uint32_t    gdb_st_rdev;    /* device type (if inode device) */
  66   uint64_t    gdb_st_size;    /* total size, in bytes */
  67   uint64_t    gdb_st_blksize; /* blocksize for filesystem I/O */
  68   uint64_t    gdb_st_blocks;  /* number of blocks allocated */
  69   gdb_time_t  gdb_st_atime;   /* time of last access */
  70   gdb_time_t  gdb_st_mtime;   /* time of last modification */
  71   gdb_time_t  gdb_st_ctime;   /* time of last change */
  72 } __attribute__((packed));
  73
  74 struct gdb_timeval {
  75   gdb_time_t tv_sec;  /* second */
  76   uint64_t tv_usec;   /* microsecond */
  77 } __attribute__((packed));
  78
  79 #define GDB_O_RDONLY   0x0
  80 #define GDB_O_WRONLY   0x1
  81 #define GDB_O_RDWR     0x2
  82 #define GDB_O_APPEND   0x8
  83 #define GDB_O_CREAT  0x200
  84 #define GDB_O_TRUNC  0x400
  85 #define GDB_O_EXCL   0x800
  86
  87 static int translate_openflags(int flags)
  88 {
  89     int hf;
  90
  91     if (flags & GDB_O_WRONLY)
  92         hf = O_WRONLY;
  93     else if (flags & GDB_O_RDWR)
  94         hf = O_RDWR;
  95     else
  96         hf = O_RDONLY;
  97
  98     if (flags & GDB_O_APPEND) hf |= O_APPEND;
  99     if (flags & GDB_O_CREAT) hf |= O_CREAT;
 100     if (flags & GDB_O_TRUNC) hf |= O_TRUNC;
 101     if (flags & GDB_O_EXCL) hf |= O_EXCL;
 102
 103     return hf;
 104 }
 105
 106 static void translate_stat(CPUState *env, target_ulong addr, struct stat *s)
 107 {
 108     struct m68k_gdb_stat *p;
 109
 110     p = lock_user(addr, sizeof(struct m68k_gdb_stat), 0);
 111     p->gdb_st_dev = cpu_to_be32(s->st_dev);
 112     p->gdb_st_ino = cpu_to_be32(s->st_ino);
 113     p->gdb_st_mode = cpu_to_be32(s->st_mode);
 114     p->gdb_st_nlink = cpu_to_be32(s->st_nlink);
 115     p->gdb_st_uid = cpu_to_be32(s->st_uid);
 116     p->gdb_st_gid = cpu_to_be32(s->st_gid);
 117     p->gdb_st_rdev = cpu_to_be32(s->st_rdev);
 118     p->gdb_st_size = cpu_to_be64(s->st_size);
 119 #ifdef _WIN32
 120     /* Windows stat is missing some fields.  */
 121     p->gdb_st_blksize = 0;
 122     p->gdb_st_blocks = 0;
 123 #else
 124     p->gdb_st_blksize = cpu_to_be64(s->st_blksize);
 125     p->gdb_st_blocks = cpu_to_be64(s->st_blocks);
 126 #endif
 127     p->gdb_st_atime = cpu_to_be32(s->st_atime);
 128     p->gdb_st_mtime = cpu_to_be32(s->st_mtime);
 129     p->gdb_st_ctime = cpu_to_be32(s->st_ctime);
 130     unlock_user(p, addr, sizeof(struct m68k_gdb_stat));
 131 }
 132
 133 static int m68k_semi_is_fseek;
 134
 135 static void m68k_semi_cb(CPUState *env, target_ulong ret, target_ulong err)
 136 {
 137     target_ulong args;
 138
 139     args = env->dregs[1];
 140     if (m68k_semi_is_fseek) {
 141         /* FIXME: We've already lost the high bits of the fseek
 142            return value.  */
 143         tput32(args, 0);
 144         args += 4;
 145         m68k_semi_is_fseek = 0;
 146     }
 147     tput32(args, ret);
 148     tput32(args + 4, errno);
 149 }
 150
 151 #define ARG(x) tget32(args + (x) * 4)
 152 #define PARG(x) ((unsigned long)ARG(x))
 153 void do_m68k_semihosting(CPUM68KState *env, int nr)
 154 {
 155     uint32_t args;
 156     void *p;
 157     void *q;
 158     uint32_t len;
 159     uint32_t result;
 160
 161     args = env->dregs[1];
 162     switch (nr) {
 163     case HOSTED_EXIT:
 164         exit(env->dregs[0]);
 165     case HOSTED_OPEN:
 166         if (use_gdb_syscalls()) {
 167             gdb_do_syscall(m68k_semi_cb, "open,%s,%x,%x", ARG(0), (int)ARG(1),
 168                            ARG(2), ARG(3));
 169             return;
 170         } else {
 171             p = lock_user_string(ARG(0));
 172             result = open(p, translate_openflags(ARG(2)), ARG(3));
 173             unlock_user(p, ARG(0), 0);
 174         }
 175         break;
 176     case HOSTED_CLOSE:
 177         {
 178             /* Ignore attempts to close stdin/out/err.  */
 179             int fd = ARG(0);
 180             if (fd > 2) {
 181                 if (use_gdb_syscalls()) {
 182                     gdb_do_syscall(m68k_semi_cb, "close,%x", ARG(0));
 183                     return;
 184                 } else {
 185                     result = close(fd);
 186                 }
 187             } else {
 188                 result = 0;
 189             }
 190             break;
 191         }
 192     case HOSTED_READ:
 193         len = ARG(2);
 194         if (use_gdb_syscalls()) {
 195             gdb_do_syscall(m68k_semi_cb, "read,%x,%x,%x",
 196                            ARG(0), ARG(1), len);
 197             return;
 198         } else {
 199             p = lock_user(ARG(1), len, 0);
 200             result = read(ARG(0), p, len);
 201             unlock_user(p, ARG(1), len);
 202         }
 203         break;
 204     case HOSTED_WRITE:
 205         len = ARG(2);
 206         if (use_gdb_syscalls()) {
 207             gdb_do_syscall(m68k_semi_cb, "write,%x,%x,%x",
 208                            ARG(0), ARG(1), len);
 209             return;
 210         } else {
 211             p = lock_user(ARG(1), len, 1);
 212             result = write(ARG(0), p, len);
 213             unlock_user(p, ARG(0), 0);
 214         }
 215         break;
 216     case HOSTED_LSEEK:
 217         {
 218             uint64_t off;
 219             off = (uint32_t)ARG(2) | ((uint64_t)ARG(1) << 32);
 220             if (use_gdb_syscalls()) {
 221                 m68k_semi_is_fseek = 1;
 222                 gdb_do_syscall(m68k_semi_cb, "fseek,%x,%lx,%x",
 223                                ARG(0), off, ARG(3));
 224             } else {
 225                 off = lseek(ARG(0), off, ARG(3));
 226                 tput32(args, off >> 32);
 227                 tput32(args + 4, off);
 228                 tput32(args + 8, errno);
 229             }
 230             return;
 231         }
 232     case HOSTED_RENAME:
 233         if (use_gdb_syscalls()) {
 234             gdb_do_syscall(m68k_semi_cb, "rename,%s,%s",
 235                            ARG(0), (int)ARG(1), ARG(2), (int)ARG(3));
 236             return;
 237         } else {
 238             p = lock_user_string(ARG(0));
 239             q = lock_user_string(ARG(2));
 240             result = rename(p, q);
 241             unlock_user(p, ARG(0), 0);
 242             unlock_user(q, ARG(2), 0);
 243         }
 244         break;
 245     case HOSTED_UNLINK:
 246         if (use_gdb_syscalls()) {
 247             gdb_do_syscall(m68k_semi_cb, "unlink,%s",
 248                            ARG(0), (int)ARG(1));
 249             return;
 250         } else {
 251             p = lock_user_string(ARG(0));
 252             result = unlink(p);
 253             unlock_user(p, ARG(0), 0);
 254         }
 255         break;
 256     case HOSTED_STAT:
 257         if (use_gdb_syscalls()) {
 258             gdb_do_syscall(m68k_semi_cb, "stat,%s,%x",
 259                            ARG(0), (int)ARG(1), ARG(2));
 260             return;
 261         } else {
 262             struct stat s;
 263             p = lock_user_string(ARG(0));
 264             result = stat(p, &s);
 265             unlock_user(p, ARG(0), 0);
 266             if (result == 0) {
 267                 translate_stat(env, ARG(2), &s);
 268             }
 269         }
 270         break;
 271     case HOSTED_FSTAT:
 272         if (use_gdb_syscalls()) {
 273             gdb_do_syscall(m68k_semi_cb, "fstat,%x,%x",
 274                            ARG(0), ARG(1));
 275             return;
 276         } else {
 277             struct stat s;
 278             result = fstat(ARG(0), &s);
 279             if (result == 0) {
 280                 translate_stat(env, ARG(1), &s);
 281             }
 282         }
 283         break;
 284     case HOSTED_GETTIMEOFDAY:
 285         if (use_gdb_syscalls()) {
 286             gdb_do_syscall(m68k_semi_cb, "gettimeofday,%x,%x",
 287                            ARG(0), ARG(1));
 288             return;
 289         } else {
 290             qemu_timeval tv;
 291             struct gdb_timeval *p;
 292             result = qemu_gettimeofday(&tv);
 293             if (result != 0) {
 294                 p = lock_user(ARG(0), sizeof(struct gdb_timeval), 0);
 295                 p->tv_sec = cpu_to_be32(tv.tv_sec);
 296                 p->tv_usec = cpu_to_be64(tv.tv_usec);
 297                 unlock_user(p, ARG(0), sizeof(struct gdb_timeval));
 298             }
 299         }
 300         break;
 301     case HOSTED_ISATTY:
 302         if (use_gdb_syscalls()) {
 303             gdb_do_syscall(m68k_semi_cb, "isatty,%x", ARG(0));
 304             return;
 305         } else {
 306             result = isatty(ARG(0));
 307         }
 308         break;
 309     case HOSTED_SYSTEM:
 310         if (use_gdb_syscalls()) {
 311             gdb_do_syscall(m68k_semi_cb, "system,%s",
 312                            ARG(0), (int)ARG(1));
 313             return;
 314         } else {
 315             p = lock_user_string(ARG(0));
 316             result = system(p);
 317             unlock_user(p, ARG(0), 0);
 318         }
 319         break;
 320     case HOSTED_INIT_SIM:
 321 #if defined(CONFIG_USER_ONLY)
 322         {
 323         TaskState *ts = env->opaque;
 324         /* Allocate the heap using sbrk.  */
 325         if (!ts->heap_limit) {
 326             long ret;
 327             uint32_t size;
 328             uint32_t base;
 329
 330             base = do_brk(0);
 331             size = SEMIHOSTING_HEAP_SIZE;
 332             /* Try a big heap, and reduce the size if that fails.  */
 333             for (;;) {
 334                 ret = do_brk(base + size);
 335                 if (ret != -1)
 336                     break;
 337                 size >>= 1;
 338             }
 339             ts->heap_limit = base + size;
 340         }
 341         /* This call may happen before we have writable memory, so return
 342            values directly in registers.  */
 343         env->dregs[1] = ts->heap_limit;
 344         env->aregs[7] = ts->stack_base;
 345         }
 346 #else
 347         /* FIXME: This is wrong for boards where RAM does not start at
 348            address zero.  */
 349         env->dregs[1] = ram_size;
 350         env->aregs[7] = ram_size;
 351 #endif
 352         return;
 353     default:
 354         cpu_abort(env, "Unsupported semihosting syscall %d\n", nr);
 355         result = 0;
 356     }
 357     tput32(args, result);
 358     tput32(args + 4, errno);
 359 }