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/* syscalls.c - non-trap system calls for D10V
*
* This file contains system calls that cannot be implemented with
* a simple "trap 15" instruction. The ones that can are in trap.S.
*/
#include <_ansi.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#undef errno
void _exit (int n); /* in trap.S */
extern int _write (int fd, const void *ptr, size_t len);
int errno;
register char *stack_ptr asm ("sp");
caddr_t
_sbrk (int incr)
{
extern char end; /* Defined by the linker */
static char *heap_end;
char *prev_heap_end;
char *sp = (char *)stack_ptr;
if (heap_end == 0)
{
heap_end = (char *)((((unsigned short) &end) + 7) & ~7);
}
prev_heap_end = heap_end;
if (heap_end + incr > sp)
{
_write (2, "Heap and stack collision\n", sizeof ("Heap and stack collision\n")-1);
abort ();
}
heap_end += incr;
if ((unsigned short)heap_end > 0xbfff
|| (heap_end < prev_heap_end && incr > 0)
|| (heap_end < (char *)((((unsigned short) &end) + 7) & ~7)))
{
_write (2, "Too much memory was allocated\n", sizeof ("Too much memory was allocated\n")-1);
abort ();
}
return (caddr_t) prev_heap_end;
}
int
_fstat (int file,
struct stat *st)
{
st->st_mode = S_IFCHR;
return 0;
}
int
_unlink ()
{
errno = ENOSYS;
return -1;
}
int
_isatty (int fd)
{
return 1;
}
void
_raise ()
{
}
/* If this library is compiled with -mint32, provide conversion functions for
the system call traps. */
#if __INT__==32
extern short _read16 (short fd, void *ptr, short len);
int
_read (int fd, void *ptr, size_t len)
{
return _read16 ((short)fd, ptr, (short)len);
}
extern short _write16 (short fd, const void *ptr, short len);
int
_write (int fd, const void *ptr, size_t len)
{
return _write16 ((short)fd, ptr, (short)len);
}
extern short _lseek16 (short fd, long offset, short whence);
int
_lseek (int fd, off_t offset, int whence)
{
return _lseek16 ((short)fd, offset, (short)whence);
}
extern short _close16 (short fd);
int
_close (int fd)
{
return _close16 ((short)fd);
}
extern short _open16 (const char *name, short flags, short mode);
int
_open (const char *name, int flags, mode_t mode)
{
return _open16 (name, (short)flags, (short)mode);
}
extern short _creat16 (const char *name, mode_t mode);
int
_creat (const char *name, mode_t mode)
{
return _creat16 (name, mode);
}
extern void _exit16 (short status);
void
_exit (int status)
{
_exit16 ((short)status);
}
extern short _stat16 (const char *name, struct stat *stat_pkt);
int
_stat (const char *name, struct stat *stat_pkt)
{
return _stat16 (name, stat_pkt);
}
extern short _chmod16 (const char *name, short mode);
int
_chmod (const char *name, mode_t mode)
{
return _chmod16 (name, (short)mode);
}
extern short _chown16 (const char *name, short uid, short gid);
int
_chown (const char *name, uid_t uid, gid_t gid)
{
return _chown16 (name, (short)uid, (short)gid);
}
extern short _fork16 (void);
int
_fork (void)
{
return _fork16 ();
}
extern short _wait16 (short *status);
int
_wait (int *status)
{
if (status)
{
short status16;
short ret = _wait16 (&status16);
if (ret >= 0)
*status = status16;
return ret;
}
else
return _wait16 ((short *)0);
}
extern short _execve16 (const char *filename, const char *argv [], const char *envp[]);
int
_execve (const char *filename, const char *argv [], const char *envp[])
{
return _execve16 (filename, argv, envp);
}
extern short _execv16 (const char *filename, const char *argv []);
int
_execv (const char *filename, const char *argv [])
{
return _execv16 (filename, argv);
}
extern short _pipe16 (short fds[]);
int
_pipe (int fds[])
{
short fds16[2];
short ret = _pipe16 (fds16);
if (ret >= 0)
{
fds[0] = fds16[0];
fds[1] = fds16[1];
}
return ret;
}
extern short _getpid16 (void);
int
_getpid (void)
{
return _getpid16 ();
}
extern short _kill16 (short pid, short sig);
int
_kill (int pid, int sig)
{
return _kill16 ((short)pid, (short)sig);
}
#endif
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