linux-user/arm-semi.c

   1 /*
   2  *  Arm "Angel" semihosting syscalls
   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 <fcntl.h>
  24 #include <unistd.h>
  25 #include <stdlib.h>
  26 #include <stdio.h>
  27 #include <time.h>
  28
  29 #include "qemu.h"
  30
  31 #define ARM_ANGEL_HEAP_SIZE (128 * 1024 * 1024)
  32
  33 #define SYS_OPEN        0x01
  34 #define SYS_CLOSE       0x02
  35 #define SYS_WRITEC      0x03
  36 #define SYS_WRITE0      0x04
  37 #define SYS_WRITE       0x05
  38 #define SYS_READ        0x06
  39 #define SYS_READC       0x07
  40 #define SYS_ISTTY       0x09
  41 #define SYS_SEEK        0x0a
  42 #define SYS_FLEN        0x0c
  43 #define SYS_TMPNAM      0x0d
  44 #define SYS_REMOVE      0x0e
  45 #define SYS_RENAME      0x0f
  46 #define SYS_CLOCK       0x10
  47 #define SYS_TIME        0x11
  48 #define SYS_SYSTEM      0x12
  49 #define SYS_ERRNO       0x13
  50 #define SYS_GET_CMDLINE 0x15
  51 #define SYS_HEAPINFO    0x16
  52 #define SYS_EXIT        0x18
  53
  54 #ifndef O_BINARY
  55 #define O_BINARY 0
  56 #endif
  57
  58 int open_modeflags[12] = {
  59     O_RDONLY,
  60     O_RDONLY | O_BINARY,
  61     O_RDWR,
  62     O_RDWR | O_BINARY,
  63     O_WRONLY | O_CREAT | O_TRUNC,
  64     O_WRONLY | O_CREAT | O_TRUNC | O_BINARY,
  65     O_RDWR | O_CREAT | O_TRUNC,
  66     O_RDWR | O_CREAT | O_TRUNC | O_BINARY,
  67     O_WRONLY | O_CREAT | O_APPEND,
  68     O_WRONLY | O_CREAT | O_APPEND | O_BINARY,
  69     O_RDWR | O_CREAT | O_APPEND,
  70     O_RDWR | O_CREAT | O_APPEND | O_BINARY
  71 };
  72
  73 static inline uint32_t set_swi_errno(TaskState *ts, uint32_t code)
  74 {
  75   if (code == (uint32_t)-1)
  76       ts->swi_errno = errno;
  77   return code;
  78 }
  79
  80 #define ARG(n) tget32(args + n * 4)
  81 uint32_t do_arm_semihosting(CPUState *env)
  82 {
  83     target_ulong args;
  84     char * s;
  85     int nr;
  86     uint32_t ret;
  87     TaskState *ts = env->opaque;
  88
  89     nr = env->regs[0];
  90     args = env->regs[1];
  91     switch (nr) {
  92     case SYS_OPEN:
  93         s = (char *)g2h(ARG(0));
  94         if (ARG(1) >= 12)
  95           return (uint32_t)-1;
  96         if (strcmp(s, ":tt") == 0) {
  97             if (ARG(1) < 4)
  98                 return STDIN_FILENO;
  99             else
 100                 return STDOUT_FILENO;
 101         }
 102         return set_swi_errno(ts, open(s, open_modeflags[ARG(1)], 0644));
 103     case SYS_CLOSE:
 104         return set_swi_errno(ts, close(ARG(0)));
 105     case SYS_WRITEC:
 106         {
 107           char c = tget8(args);
 108           /* Write to debug console.  stderr is near enough.  */
 109           return write(STDERR_FILENO, &c, 1);
 110         }
 111     case SYS_WRITE0:
 112         s = lock_user_string(args);
 113         ret = write(STDERR_FILENO, s, strlen(s));
 114         unlock_user(s, args, 0);
 115         return ret;
 116     case SYS_WRITE:
 117         ret = set_swi_errno(ts, write(ARG(0), g2h(ARG(1)), ARG(2)));
 118         if (ret == (uint32_t)-1)
 119             return -1;
 120         return ARG(2) - ret;
 121     case SYS_READ:
 122         ret = set_swi_errno(ts, read(ARG(0), g2h(ARG(1)), ARG(2)));
 123         if (ret == (uint32_t)-1)
 124             return -1;
 125         return ARG(2) - ret;
 126     case SYS_READC:
 127        /* XXX: Read from debug cosole. Not implemented.  */
 128         return 0;
 129     case SYS_ISTTY:
 130         return isatty(ARG(0));
 131     case SYS_SEEK:
 132         ret = set_swi_errno(ts, lseek(ARG(0), ARG(1), SEEK_SET));
 133         if (ret == (uint32_t)-1)
 134           return -1;
 135         return 0;
 136     case SYS_FLEN:
 137         {
 138             struct stat buf;
 139             ret = set_swi_errno(ts, fstat(ARG(0), &buf));
 140             if (ret == (uint32_t)-1)
 141                 return -1;
 142             return buf.st_size;
 143         }
 144     case SYS_TMPNAM:
 145         /* XXX: Not implemented.  */
 146         return -1;
 147     case SYS_REMOVE:
 148         return set_swi_errno(ts, remove((char *)g2h(ARG(0))));
 149     case SYS_RENAME:
 150         return set_swi_errno(ts, rename((char *)g2h(ARG(0)),
 151                              (char *)g2h(ARG(2))));
 152     case SYS_CLOCK:
 153         return clock() / (CLOCKS_PER_SEC / 100);
 154     case SYS_TIME:
 155         return set_swi_errno(ts, time(NULL));
 156     case SYS_SYSTEM:
 157         return set_swi_errno(ts, system((char *)g2h(ARG(0))));
 158     case SYS_ERRNO:
 159         return ts->swi_errno;
 160     case SYS_GET_CMDLINE:
 161         /* XXX: Not implemented.  */
 162         s = (char *)g2h(ARG(0));
 163         *s = 0;
 164         return -1;
 165     case SYS_HEAPINFO:
 166         {
 167             uint32_t *ptr;
 168             uint32_t limit;
 169
 170             /* Some C llibraries assume the heap immediately follows .bss, so
 171                allocate it using sbrk.  */
 172             if (!ts->heap_limit) {
 173                 long ret;
 174
 175                 ts->heap_base = do_brk(0);
 176                 limit = ts->heap_base + ARM_ANGEL_HEAP_SIZE;
 177                 /* Try a big heap, and reduce the size if that fails.  */
 178                 for (;;) {
 179                     ret = do_brk(limit);
 180                     if (ret != -1)
 181                         break;
 182                     limit = (ts->heap_base >> 1) + (limit >> 1);
 183                 }
 184                 ts->heap_limit = limit;
 185             }
 186
 187             page_unprotect_range (ARG(0), 32);
 188             ptr = (uint32_t *)g2h(ARG(0));
 189             ptr[0] = tswap32(ts->heap_base);
 190             ptr[1] = tswap32(ts->heap_limit);
 191             ptr[2] = tswap32(ts->stack_base);
 192             ptr[3] = tswap32(0); /* Stack limit.  */
 193             return 0;
 194         }
 195     case SYS_EXIT:
 196         exit(0);
 197     default:
 198         fprintf(stderr, "qemu: Unsupported SemiHosting SWI 0x%02x\n", nr);
 199         cpu_dump_state(env, stderr, fprintf, 0);
 200         abort();
 201     }
 202 }
 203