arm-semi.c

   1 /*
   2  *  Arm "Angel" semihosting syscalls
   3  *
   4  *  Copyright (c) 2005, 2007 CodeSourcery.
   5  *  Written by Paul Brook.
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License as published by
   9  *  the Free Software Foundation; either version 2 of the License, or
  10  *  (at your option) any later version.
  11  *
  12  *  This program is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *  GNU General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License
  18  *  along with this program; if not, write to the Free Software
  19  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20  */
  21
  22 #include <sys/types.h>
  23 #include <sys/stat.h>
  24 #include <fcntl.h>
  25 #include <unistd.h>
  26 #include <stdlib.h>
  27 #include <stdio.h>
  28 #include <time.h>
  29
  30 #include "cpu.h"
  31 #ifdef CONFIG_USER_ONLY
  32 #include "qemu.h"
  33
  34 #define ARM_ANGEL_HEAP_SIZE (128 * 1024 * 1024)
  35 #else
  36 #include "qemu-common.h"
  37 #include "sysemu.h"
  38 #include "gdbstub.h"
  39 #endif
  40
  41 #define SYS_OPEN        0x01
  42 #define SYS_CLOSE       0x02
  43 #define SYS_WRITEC      0x03
  44 #define SYS_WRITE0      0x04
  45 #define SYS_WRITE       0x05
  46 #define SYS_READ        0x06
  47 #define SYS_READC       0x07
  48 #define SYS_ISTTY       0x09
  49 #define SYS_SEEK        0x0a
  50 #define SYS_FLEN        0x0c
  51 #define SYS_TMPNAM      0x0d
  52 #define SYS_REMOVE      0x0e
  53 #define SYS_RENAME      0x0f
  54 #define SYS_CLOCK       0x10
  55 #define SYS_TIME        0x11
  56 #define SYS_SYSTEM      0x12
  57 #define SYS_ERRNO       0x13
  58 #define SYS_GET_CMDLINE 0x15
  59 #define SYS_HEAPINFO    0x16
  60 #define SYS_EXIT        0x18
  61
  62 #ifndef O_BINARY
  63 #define O_BINARY 0
  64 #endif
  65
  66 #define GDB_O_RDONLY  0x000
  67 #define GDB_O_WRONLY  0x001
  68 #define GDB_O_RDWR    0x002
  69 #define GDB_O_APPEND  0x008
  70 #define GDB_O_CREAT   0x200
  71 #define GDB_O_TRUNC   0x400
  72 #define GDB_O_BINARY  0
  73
  74 static int gdb_open_modeflags[12] = {
  75     GDB_O_RDONLY,
  76     GDB_O_RDONLY | GDB_O_BINARY,
  77     GDB_O_RDWR,
  78     GDB_O_RDWR | GDB_O_BINARY,
  79     GDB_O_WRONLY | GDB_O_CREAT | GDB_O_TRUNC,
  80     GDB_O_WRONLY | GDB_O_CREAT | GDB_O_TRUNC | GDB_O_BINARY,
  81     GDB_O_RDWR | GDB_O_CREAT | GDB_O_TRUNC,
  82     GDB_O_RDWR | GDB_O_CREAT | GDB_O_TRUNC | GDB_O_BINARY,
  83     GDB_O_WRONLY | GDB_O_CREAT | GDB_O_APPEND,
  84     GDB_O_WRONLY | GDB_O_CREAT | GDB_O_APPEND | GDB_O_BINARY,
  85     GDB_O_RDWR | GDB_O_CREAT | GDB_O_APPEND,
  86     GDB_O_RDWR | GDB_O_CREAT | GDB_O_APPEND | GDB_O_BINARY
  87 };
  88
  89 static int open_modeflags[12] = {
  90     O_RDONLY,
  91     O_RDONLY | O_BINARY,
  92     O_RDWR,
  93     O_RDWR | O_BINARY,
  94     O_WRONLY | O_CREAT | O_TRUNC,
  95     O_WRONLY | O_CREAT | O_TRUNC | O_BINARY,
  96     O_RDWR | O_CREAT | O_TRUNC,
  97     O_RDWR | O_CREAT | O_TRUNC | O_BINARY,
  98     O_WRONLY | O_CREAT | O_APPEND,
  99     O_WRONLY | O_CREAT | O_APPEND | O_BINARY,
 100     O_RDWR | O_CREAT | O_APPEND,
 101     O_RDWR | O_CREAT | O_APPEND | O_BINARY
 102 };
 103
 104 #ifdef CONFIG_USER_ONLY
 105 static inline uint32_t set_swi_errno(TaskState *ts, uint32_t code)
 106 {
 107     if (code == (uint32_t)-1)
 108         ts->swi_errno = errno;
 109     return code;
 110 }
 111 #else
 112 static inline uint32_t set_swi_errno(CPUState *env, uint32_t code)
 113 {
 114     return code;
 115 }
 116
 117 #include "softmmu-semi.h"
 118 #endif
 119
 120 static target_ulong arm_semi_syscall_len;
 121
 122 #if !defined(CONFIG_USER_ONLY)
 123 static target_ulong syscall_err;
 124 #endif
 125
 126 static void arm_semi_cb(CPUState *env, target_ulong ret, target_ulong err)
 127 {
 128 #ifdef CONFIG_USER_ONLY
 129     TaskState *ts = env->opaque;
 130 #endif
 131
 132     if (ret == (target_ulong)-1) {
 133 #ifdef CONFIG_USER_ONLY
 134         ts->swi_errno = err;
 135 #else
 136         syscall_err = err;
 137 #endif
 138         env->regs[0] = ret;
 139     } else {
 140         /* Fixup syscalls that use nonstardard return conventions.  */
 141         switch (env->regs[0]) {
 142         case SYS_WRITE:
 143         case SYS_READ:
 144             env->regs[0] = arm_semi_syscall_len - ret;
 145             break;
 146         case SYS_SEEK:
 147             env->regs[0] = 0;
 148             break;
 149         default:
 150             env->regs[0] = ret;
 151             break;
 152         }
 153     }
 154 }
 155
 156 static void arm_semi_flen_cb(CPUState *env, target_ulong ret, target_ulong err)
 157 {
 158     /* The size is always stored in big-endian order, extract
 159        the value. We assume the size always fit in 32 bits.  */
 160     uint32_t size;
 161     cpu_memory_rw_debug(env, env->regs[13]-64+32, (uint8_t *)&size, 4, 0);
 162     env->regs[0] = be32_to_cpu(size);
 163 #ifdef CONFIG_USER_ONLY
 164     ((TaskState *)env->opaque)->swi_errno = err;
 165 #else
 166     syscall_err = err;
 167 #endif
 168 }
 169
 170 #define ARG(n)                                  \
 171 ({                                              \
 172     target_ulong __arg;                         \
 173     /* FIXME - handle get_user() failure */     \
 174     get_user_ual(__arg, args + (n) * 4);        \
 175     __arg;                                      \
 176 })
 177 #define SET_ARG(n, val) put_user_ual(val, args + (n) * 4)
 178 uint32_t do_arm_semihosting(CPUState *env)
 179 {
 180     target_ulong args;
 181     char * s;
 182     int nr;
 183     uint32_t ret;
 184     uint32_t len;
 185 #ifdef CONFIG_USER_ONLY
 186     TaskState *ts = env->opaque;
 187 #else
 188     CPUState *ts = env;
 189 #endif
 190
 191     nr = env->regs[0];
 192     args = env->regs[1];
 193     switch (nr) {
 194     case SYS_OPEN:
 195         if (!(s = lock_user_string(ARG(0))))
 196             /* FIXME - should this error code be -TARGET_EFAULT ? */
 197             return (uint32_t)-1;
 198         if (ARG(1) >= 12)
 199             return (uint32_t)-1;
 200         if (strcmp(s, ":tt") == 0) {
 201             if (ARG(1) < 4)
 202                 return STDIN_FILENO;
 203             else
 204                 return STDOUT_FILENO;
 205         }
 206         if (use_gdb_syscalls()) {
 207             gdb_do_syscall(arm_semi_cb, "open,%s,%x,1a4", ARG(0),
 208                            (int)ARG(2)+1, gdb_open_modeflags[ARG(1)]);
 209             return env->regs[0];
 210         } else {
 211             ret = set_swi_errno(ts, open(s, open_modeflags[ARG(1)], 0644));
 212         }
 213         unlock_user(s, ARG(0), 0);
 214         return ret;
 215     case SYS_CLOSE:
 216         if (use_gdb_syscalls()) {
 217             gdb_do_syscall(arm_semi_cb, "close,%x", ARG(0));
 218             return env->regs[0];
 219         } else {
 220             return set_swi_errno(ts, close(ARG(0)));
 221         }
 222     case SYS_WRITEC:
 223         {
 224           char c;
 225
 226           if (get_user_u8(c, args))
 227               /* FIXME - should this error code be -TARGET_EFAULT ? */
 228               return (uint32_t)-1;
 229           /* Write to debug console.  stderr is near enough.  */
 230           if (use_gdb_syscalls()) {
 231                 gdb_do_syscall(arm_semi_cb, "write,2,%x,1", args);
 232                 return env->regs[0];
 233           } else {
 234                 return write(STDERR_FILENO, &c, 1);
 235           }
 236         }
 237     case SYS_WRITE0:
 238         if (!(s = lock_user_string(args)))
 239             /* FIXME - should this error code be -TARGET_EFAULT ? */
 240             return (uint32_t)-1;
 241         len = strlen(s);
 242         if (use_gdb_syscalls()) {
 243             gdb_do_syscall(arm_semi_cb, "write,2,%x,%x\n", args, len);
 244             ret = env->regs[0];
 245         } else {
 246             ret = write(STDERR_FILENO, s, len);
 247         }
 248         unlock_user(s, args, 0);
 249         return ret;
 250     case SYS_WRITE:
 251         len = ARG(2);
 252         if (use_gdb_syscalls()) {
 253             arm_semi_syscall_len = len;
 254             gdb_do_syscall(arm_semi_cb, "write,%x,%x,%x", ARG(0), ARG(1), len);
 255             return env->regs[0];
 256         } else {
 257             if (!(s = lock_user(VERIFY_READ, ARG(1), len, 1)))
 258                 /* FIXME - should this error code be -TARGET_EFAULT ? */
 259                 return (uint32_t)-1;
 260             ret = set_swi_errno(ts, write(ARG(0), s, len));
 261             unlock_user(s, ARG(1), 0);
 262             if (ret == (uint32_t)-1)
 263                 return -1;
 264             return len - ret;
 265         }
 266     case SYS_READ:
 267         len = ARG(2);
 268         if (use_gdb_syscalls()) {
 269             arm_semi_syscall_len = len;
 270             gdb_do_syscall(arm_semi_cb, "read,%x,%x,%x", ARG(0), ARG(1), len);
 271             return env->regs[0];
 272         } else {
 273             if (!(s = lock_user(VERIFY_WRITE, ARG(1), len, 0)))
 274                 /* FIXME - should this error code be -TARGET_EFAULT ? */
 275                 return (uint32_t)-1;
 276             do
 277               ret = set_swi_errno(ts, read(ARG(0), s, len));
 278             while (ret == -1 && errno == EINTR);
 279             unlock_user(s, ARG(1), len);
 280             if (ret == (uint32_t)-1)
 281                 return -1;
 282             return len - ret;
 283         }
 284     case SYS_READC:
 285        /* XXX: Read from debug cosole. Not implemented.  */
 286         return 0;
 287     case SYS_ISTTY:
 288         if (use_gdb_syscalls()) {
 289             gdb_do_syscall(arm_semi_cb, "isatty,%x", ARG(0));
 290             return env->regs[0];
 291         } else {
 292             return isatty(ARG(0));
 293         }
 294     case SYS_SEEK:
 295         if (use_gdb_syscalls()) {
 296             gdb_do_syscall(arm_semi_cb, "lseek,%x,%x,0", ARG(0), ARG(1));
 297             return env->regs[0];
 298         } else {
 299             ret = set_swi_errno(ts, lseek(ARG(0), ARG(1), SEEK_SET));
 300             if (ret == (uint32_t)-1)
 301               return -1;
 302             return 0;
 303         }
 304     case SYS_FLEN:
 305         if (use_gdb_syscalls()) {
 306             gdb_do_syscall(arm_semi_flen_cb, "fstat,%x,%x",
 307                            ARG(0), env->regs[13]-64);
 308             return env->regs[0];
 309         } else {
 310             struct stat buf;
 311             ret = set_swi_errno(ts, fstat(ARG(0), &buf));
 312             if (ret == (uint32_t)-1)
 313                 return -1;
 314             return buf.st_size;
 315         }
 316     case SYS_TMPNAM:
 317         /* XXX: Not implemented.  */
 318         return -1;
 319     case SYS_REMOVE:
 320         if (use_gdb_syscalls()) {
 321             gdb_do_syscall(arm_semi_cb, "unlink,%s", ARG(0), (int)ARG(1)+1);
 322             ret = env->regs[0];
 323         } else {
 324             if (!(s = lock_user_string(ARG(0))))
 325                 /* FIXME - should this error code be -TARGET_EFAULT ? */
 326                 return (uint32_t)-1;
 327             ret =  set_swi_errno(ts, remove(s));
 328             unlock_user(s, ARG(0), 0);
 329         }
 330         return ret;
 331     case SYS_RENAME:
 332         if (use_gdb_syscalls()) {
 333             gdb_do_syscall(arm_semi_cb, "rename,%s,%s",
 334                            ARG(0), (int)ARG(1)+1, ARG(2), (int)ARG(3)+1);
 335             return env->regs[0];
 336         } else {
 337             char *s2;
 338             s = lock_user_string(ARG(0));
 339             s2 = lock_user_string(ARG(2));
 340             if (!s || !s2)
 341                 /* FIXME - should this error code be -TARGET_EFAULT ? */
 342                 ret = (uint32_t)-1;
 343             else
 344                 ret = set_swi_errno(ts, rename(s, s2));
 345             if (s2)
 346                 unlock_user(s2, ARG(2), 0);
 347             if (s)
 348                 unlock_user(s, ARG(0), 0);
 349             return ret;
 350         }
 351     case SYS_CLOCK:
 352         return clock() / (CLOCKS_PER_SEC / 100);
 353     case SYS_TIME:
 354         return set_swi_errno(ts, time(NULL));
 355     case SYS_SYSTEM:
 356         if (use_gdb_syscalls()) {
 357             gdb_do_syscall(arm_semi_cb, "system,%s", ARG(0), (int)ARG(1)+1);
 358             return env->regs[0];
 359         } else {
 360             if (!(s = lock_user_string(ARG(0))))
 361                 /* FIXME - should this error code be -TARGET_EFAULT ? */
 362                 return (uint32_t)-1;
 363             ret = set_swi_errno(ts, system(s));
 364             unlock_user(s, ARG(0), 0);
 365         }
 366     case SYS_ERRNO:
 367 #ifdef CONFIG_USER_ONLY
 368         return ts->swi_errno;
 369 #else
 370         return syscall_err;
 371 #endif
 372     case SYS_GET_CMDLINE:
 373 #ifdef CONFIG_USER_ONLY
 374         /* Build a commandline from the original argv.  */
 375         {
 376             char **arg = ts->info->host_argv;
 377             int len = ARG(1);
 378             /* lock the buffer on the ARM side */
 379             char *cmdline_buffer = (char*)lock_user(VERIFY_WRITE, ARG(0), len, 0);
 380
 381             if (!cmdline_buffer)
 382                 /* FIXME - should this error code be -TARGET_EFAULT ? */
 383                 return (uint32_t)-1;
 384
 385             s = cmdline_buffer;
 386             while (*arg && len > 2) {
 387                 int n = strlen(*arg);
 388
 389                 if (s != cmdline_buffer) {
 390                     *(s++) = ' ';
 391                     len--;
 392                 }
 393                 if (n >= len)
 394                     n = len - 1;
 395                 memcpy(s, *arg, n);
 396                 s += n;
 397                 len -= n;
 398                 arg++;
 399             }
 400             /* Null terminate the string.  */
 401             *s = 0;
 402             len = s - cmdline_buffer;
 403
 404             /* Unlock the buffer on the ARM side.  */
 405             unlock_user(cmdline_buffer, ARG(0), len);
 406
 407             /* Adjust the commandline length argument.  */
 408             SET_ARG(1, len);
 409
 410             /* Return success if commandline fit into buffer.  */
 411             return *arg ? -1 : 0;
 412         }
 413 #else
 414       return -1;
 415 #endif
 416     case SYS_HEAPINFO:
 417         {
 418             uint32_t *ptr;
 419             uint32_t limit;
 420
 421 #ifdef CONFIG_USER_ONLY
 422             /* Some C libraries assume the heap immediately follows .bss, so
 423                allocate it using sbrk.  */
 424             if (!ts->heap_limit) {
 425                 long ret;
 426
 427                 ts->heap_base = do_brk(0);
 428                 limit = ts->heap_base + ARM_ANGEL_HEAP_SIZE;
 429                 /* Try a big heap, and reduce the size if that fails.  */
 430                 for (;;) {
 431                     ret = do_brk(limit);
 432                     if (ret != -1)
 433                         break;
 434                     limit = (ts->heap_base >> 1) + (limit >> 1);
 435                 }
 436                 ts->heap_limit = limit;
 437             }
 438
 439             if (!(ptr = lock_user(VERIFY_WRITE, ARG(0), 16, 0)))
 440                 /* FIXME - should this error code be -TARGET_EFAULT ? */
 441                 return (uint32_t)-1;
 442             ptr[0] = tswap32(ts->heap_base);
 443             ptr[1] = tswap32(ts->heap_limit);
 444             ptr[2] = tswap32(ts->stack_base);
 445             ptr[3] = tswap32(0); /* Stack limit.  */
 446             unlock_user(ptr, ARG(0), 16);
 447 #else
 448             limit = ram_size;
 449             if (!(ptr = lock_user(VERIFY_WRITE, ARG(0), 16, 0)))
 450                 /* FIXME - should this error code be -TARGET_EFAULT ? */
 451                 return (uint32_t)-1;
 452             /* TODO: Make this use the limit of the loaded application.  */
 453             ptr[0] = tswap32(limit / 2);
 454             ptr[1] = tswap32(limit);
 455             ptr[2] = tswap32(limit); /* Stack base */
 456             ptr[3] = tswap32(0); /* Stack limit.  */
 457             unlock_user(ptr, ARG(0), 16);
 458 #endif
 459             return 0;
 460         }
 461     case SYS_EXIT:
 462         exit(0);
 463     default:
 464         fprintf(stderr, "qemu: Unsupported SemiHosting SWI 0x%02x\n", nr);
 465         cpu_dump_state(env, stderr, fprintf, 0);
 466         abort();
 467     }
 468 }