libgloss/arm/redboot-syscalls.c

   1 /*
   2  * redboot-syscalls.c -- provide system call support for RedBoot
   3  *
   4  * Copyright (c) 1997, 2001, 2002 Red Hat, Inc.
   5  *
   6  * The authors hereby grant permission to use, copy, modify, distribute,
   7  * and license this software and its documentation for any purpose, provided
   8  * that existing copyright notices are retained in all copies and that this
   9  * notice is included verbatim in any distributions. No written agreement,
  10  * license, or royalty fee is required for any of the authorized uses.
  11  * Modifications to this software may be copyrighted by their authors
  12  * and need not follow the licensing terms described here, provided that
  13  * the new terms are clearly indicated on the first page of each file where
  14  * they apply.
  15  *
  16  */
  17
  18 #include <stdlib.h>
  19 #include <sys/stat.h>
  20 #include <sys/times.h>
  21 #include <errno.h>
  22 #include "syscall.h"
  23
  24 // Use "naked" attribute to suppress C prologue/epilogue
  25 static int __attribute__ ((naked)) __syscall(int func_no, ...)
  26 {
  27     asm ("mov   r12, lr\n");
  28 #ifdef __thumb__
  29     asm ("swi 0x18\n");
  30 #else
  31     asm ("swi 0x180001\n");
  32 #endif
  33     asm ("mov   pc, r12\n");
  34 }
  35
  36 int
  37 _close(int fd)
  38 {
  39     int  err;
  40     err = __syscall(SYS_close, fd);
  41     if (err<0)
  42       {
  43         errno = -err;
  44         return -1;
  45       }
  46     return err;
  47 }
  48
  49
  50 void
  51 _exit(int stat)
  52 {
  53     while (1)
  54         __syscall(SYS_exit, stat);
  55 }
  56
  57
  58 int
  59 _stat (const char *filename, struct stat *st)
  60 {
  61     int err;
  62     err = __syscall(SYS_stat, filename, st);
  63     if (err<0)
  64       {
  65         errno = -err;
  66         return -1;
  67       }
  68     return err;
  69 }
  70
  71 int
  72 _fstat (int file, struct stat *st)
  73 {
  74     int err;
  75     err = __syscall(SYS_fstat, file, st);
  76     if (err<0)
  77       {
  78         errno = -err;
  79         return -1;
  80       }
  81     return err;
  82 }
  83
  84 int
  85 _getpid(void)
  86 {
  87     return 1;
  88 }
  89
  90
  91 int
  92 _gettimeofday (void * tp, void * tzp)
  93 {
  94     int err;
  95     err = __syscall(SYS_gettimeofday, tp, tzp);
  96     if (err<0)
  97       {
  98         errno = -err;
  99         return -1;
 100       }
 101     return err;
 102 }
 103
 104
 105 int
 106 _isatty(int fd)
 107 {
 108     int err;
 109     err = __syscall(SYS_isatty, fd);
 110     if (err<0)
 111       {
 112         errno = -err;
 113         return -1;
 114       }
 115     return err;
 116 }
 117
 118
 119 int
 120 _kill(int pid, int sig)
 121 {
 122   if(pid == 1)
 123     _exit(sig);
 124   return 0;
 125 }
 126
 127
 128 off_t
 129 _lseek(int fd, off_t offset, int whence)
 130 {
 131     int err;
 132     err = __syscall(SYS_lseek, fd, offset, whence);
 133     if (err<0)
 134       {
 135         errno = -err;
 136         return (off_t)-1;
 137       }
 138     return err;
 139 }
 140
 141
 142 int
 143 _open(const char *buf, int flags, int mode)
 144 {
 145     int err ;
 146     err = __syscall(SYS_open, buf, flags, mode);
 147     if (err<0)
 148       {
 149         errno = -err;
 150         return -1;
 151       }
 152     return err;
 153 }
 154
 155
 156 int
 157 _write(int fd, const char *buf, int nbytes)
 158 {
 159     int err;
 160
 161     err = __syscall(SYS_write, fd, buf, nbytes);
 162     if (err<0)
 163       {
 164         errno = -err;
 165         return -1;
 166       }
 167     return err;
 168 }
 169
 170
 171 void
 172 print(char *ptr)
 173 {
 174   char *p = ptr;
 175
 176   while (*p != '\0')
 177     p++;
 178
 179   _write (1, ptr, p-ptr);
 180 }
 181
 182 void
 183 _raise (void)
 184 {
 185     return;
 186 }
 187
 188
 189 int
 190 _read(int fd, char *buf, int nbytes)
 191 {
 192     int err;
 193     err = __syscall(SYS_read, fd, buf, nbytes);
 194     if (err<0)
 195       {
 196         errno = -err;
 197         return -1;
 198       }
 199     return err;
 200 }
 201
 202
 203 extern char end[];                /* end is set in the linker command file */
 204
 205 char *heap_ptr;
 206
 207 char *
 208 _sbrk (int nbytes)
 209 {
 210     char        *base;
 211
 212     if (!heap_ptr)
 213         heap_ptr = (char *)&end;
 214     base = heap_ptr;
 215     heap_ptr += nbytes;
 216
 217     return base;
 218 }
 219
 220
 221 clock_t
 222 _times(struct tms * tp)
 223 {
 224     clock_t utime;
 225     int err;
 226     err = __syscall(SYS_times, &utime);
 227     if (err)
 228         utime = 0;
 229
 230     if (tp) {
 231         tp->tms_utime = utime;
 232         tp->tms_stime = 0;
 233         tp->tms_cutime = 0;
 234         tp->tms_cstime = 0;
 235     }
 236
 237     return utime;
 238 }
 239
 240 int
 241 _rename (const char *oldpath, const char *newpath)
 242 {
 243     int err ;
 244     err = __syscall(SYS_rename, oldpath, newpath);
 245     if (err<0)
 246       {
 247         errno = -err;
 248         return -1;
 249       }
 250     return err;
 251 }
 252
 253 int
 254 _unlink (const char *pathname)
 255 {
 256     int err ;
 257     err = __syscall(SYS_unlink, pathname);
 258     if (err<0)
 259       {
 260         errno = -err;
 261         return -1;
 262       }
 263     return err;
 264 }
 265
 266 int
 267 _system (const char *command)
 268 {
 269     int err ;
 270     err = __syscall(SYS_system, command);
 271     return err;
 272 }
 273
 274 #define SYS_meminfo     1001
 275
 276 void *
 277 __get_memtop(void)
 278 {
 279   unsigned long totmem = 0, topmem = 0;
 280   int numbanks;
 281
 282   __syscall(SYS_meminfo, (unsigned long)&totmem, (unsigned long)&topmem, 0);
 283   return (void*)topmem;
 284 }