423 lines
8.1 KiB
C
423 lines
8.1 KiB
C
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/* Host callback routines for GDB.
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Copyright 1995, 1996 Free Software Foundation, Inc.
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Contributed by Cygnus Support.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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/* This file provides a standard way for targets to talk to the host OS
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level. */
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#include "ansidecl.h"
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#ifdef ANSI_PROTOTYPES
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#include <stdarg.h>
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#else
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#include <varargs.h>
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#endif
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#include <stdio.h>
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#ifdef HAVE_STDLIB_H
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#include <stdlib.h>
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#endif
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#include <errno.h>
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#include <fcntl.h>
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#include <time.h>
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#include "callback.h"
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#include "targ-vals.h"
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static int os_init PARAMS ((host_callback *));
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static int os_shutdown PARAMS ((host_callback *));
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static int os_unlink PARAMS ((host_callback *, const char *));
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static long os_time PARAMS ((host_callback *, long *));
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static int os_system PARAMS ((host_callback *, const char *));
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static int os_rename PARAMS ((host_callback *, const char *, const char *));
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static int os_write_stdout PARAMS ((host_callback *, const char *, int));
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static int os_write PARAMS ((host_callback *, int, const char *, int));
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static int os_read_stdin PARAMS ((host_callback *, char *, int));
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static int os_read PARAMS ((host_callback *, int, char *, int));
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static int os_open PARAMS ((host_callback *, const char *, int));
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static int os_lseek PARAMS ((host_callback *, int, long, int));
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static int os_isatty PARAMS ((host_callback *, int));
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static int os_get_errno PARAMS ((host_callback *));
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static int os_close PARAMS ((host_callback *, int));
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static int fdmap PARAMS ((host_callback *, int));
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static int fdbad PARAMS ((host_callback *, int));
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static int wrap PARAMS ((host_callback *, int));
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/* Set the callback copy of errno from what we see now. */
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static int
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wrap (p, val)
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host_callback *p;
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int val;
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{
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p->last_errno = errno;
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return val;
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}
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/* Make sure the FD provided is ok. If not, return non-zero
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and set errno. */
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static int
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fdbad (p, fd)
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host_callback *p;
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int fd;
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{
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if (fd < 0 || fd > MAX_CALLBACK_FDS || !p->fdopen[fd])
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{
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p->last_errno = EINVAL;
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return -1;
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}
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return 0;
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}
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static int
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fdmap (p, fd)
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host_callback *p;
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int fd;
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{
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return p->fdmap[fd];
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}
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static int
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os_close (p, fd)
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host_callback *p;
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int fd;
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{
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int result;
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result = fdbad (p, fd);
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if (result)
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return result;
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result = wrap (p, close (fdmap (p, fd)));
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return result;
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}
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static int
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os_get_errno (p)
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host_callback *p;
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{
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return host_to_target_errno (p->last_errno);
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}
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static int
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os_isatty (p, fd)
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host_callback *p;
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int fd;
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{
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int result;
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result = fdbad (p, fd);
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if (result)
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return result;
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result = wrap (p, isatty (fdmap (p, fd)));
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return result;
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}
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static int
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os_lseek (p, fd, off, way)
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host_callback *p;
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int fd;
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long off;
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int way;
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{
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int result;
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result = fdbad (p, fd);
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if (result)
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return result;
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result = lseek (fdmap (p, fd), off, way);
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return result;
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}
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static int
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os_open (p, name, flags)
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host_callback *p;
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const char *name;
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int flags;
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{
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int i;
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for (i = 0; i < MAX_CALLBACK_FDS; i++)
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{
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if (!p->fdopen[i])
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{
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int f = open (name, target_to_host_open (flags));
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if (f < 0)
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{
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p->last_errno = errno;
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return f;
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}
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p->fdopen[i] = 1;
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p->fdmap[i] = f;
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return i;
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}
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}
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p->last_errno = EMFILE;
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return -1;
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}
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static int
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os_read (p, fd, buf, len)
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host_callback *p;
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int fd;
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char *buf;
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int len;
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{
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int result;
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result = fdbad (p, fd);
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if (result)
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return result;
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result = wrap (p, read (fdmap (p, fd), buf, len));
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return result;
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}
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static int
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os_read_stdin (p, buf, len)
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host_callback *p;
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char *buf;
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int len;
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{
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return wrap (p, read (0, buf, len));
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}
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static int
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os_write (p, fd, buf, len)
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host_callback *p;
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int fd;
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const char *buf;
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int len;
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{
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int result;
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result = fdbad (p, fd);
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if (result)
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return result;
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result = wrap (p, write (fdmap (p, fd), buf, len));
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return result;
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}
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static int
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os_write_stdout (p, buf, len)
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host_callback *p;
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const char *buf;
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int len;
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{
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return os_write (p, 1, buf, len);
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}
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static int
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os_rename (p, f1, f2)
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host_callback *p;
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const char *f1;
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const char *f2;
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{
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return wrap (p, rename (f1, f2));
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}
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static int
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os_system (p, s)
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host_callback *p;
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const char *s;
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{
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return wrap (p, system (s));
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}
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static long
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os_time (p, t)
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host_callback *p;
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long *t;
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{
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return wrap (p, time (t));
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}
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static int
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os_unlink (p, f1)
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host_callback *p;
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const char *f1;
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{
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return wrap (p, unlink (f1));
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}
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static int
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os_shutdown (p)
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host_callback *p;
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{
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int i;
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for (i = 0; i < MAX_CALLBACK_FDS; i++)
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{
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if (p->fdopen[i] && !p->alwaysopen[i]) {
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close (p->fdmap[i]);
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p->fdopen[i] = 0;
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}
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}
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return 1;
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}
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static int
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os_init(p)
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host_callback *p;
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{
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int i;
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os_shutdown (p);
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for (i= 0; i < 3; i++)
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{
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p->fdmap[i] = i;
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p->fdopen[i] = 1;
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p->alwaysopen[i] = 1;
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}
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return 1;
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}
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/* VARARGS */
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static void
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#ifdef ANSI_PROTOTYPES
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os_printf_filtered (host_callback *p, const char *format, ...)
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#else
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os_printf_filtered (p, va_alist)
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host_callback *p;
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va_dcl
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#endif
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{
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va_list args;
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#ifdef ANSI_PROTOTYPES
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va_start (args, format);
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#else
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char *format;
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va_start (args);
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format = va_arg (args, char *);
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#endif
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vprintf (format, args);
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va_end (args);
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}
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/* VARARGS */
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static void
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#ifdef ANSI_PROTOTYPES
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os_error (host_callback *p, const char *format, ...)
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#else
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os_error (p, va_alist)
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host_callback *p;
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va_dcl
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#endif
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{
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va_list args;
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#ifdef ANSI_PROTOTYPES
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va_start (args, format);
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#else
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char *format;
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va_start (args);
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format = va_arg (args, char *);
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#endif
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vfprintf (stderr, format, args);
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fprintf (stderr, "\n");
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va_end (args);
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exit (EXIT_FAILURE);
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}
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host_callback default_callback =
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{
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os_close,
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os_get_errno,
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os_isatty,
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os_lseek,
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os_open,
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os_read,
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os_read_stdin,
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os_rename,
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os_system,
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os_time,
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os_unlink,
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os_write,
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os_write_stdout,
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os_shutdown,
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os_init,
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os_printf_filtered,
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os_error,
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0, /* last errno */
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};
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/* FIXME: Need to add hooks so target can tweak as necessary. */
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/* FIXME: struct stat conversion is missing. */
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/* FIXME: sort tables if large.
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Alternatively, an obvious improvement for errno conversion is
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to machine generate a function with a large switch(). */
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int
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host_to_target_errno (host_val)
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int host_val;
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{
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target_defs_map *m;
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for (m = &errno_map[0]; m->host_val; ++m)
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if (m->host_val == host_val)
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return m->target_val;
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/* ??? Which error to return in this case is up for grabs.
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Note that some missing values may have standard alternatives.
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For now return 0 and require caller to deal with it. */
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return 0;
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}
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/* Given a set of target bitmasks for the open system call,
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return the host equivalent.
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Mapping open flag values is best done by looping so there's no need
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to machine generate this function. */
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int
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target_to_host_open (target_val)
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int target_val;
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{
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int host_val = 0;
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target_defs_map *m;
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for (m = &open_map[0]; m->host_val != -1; ++m)
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|
|
{
|
|||
|
|
switch (m->target_val)
|
|||
|
|
{
|
|||
|
|
/* O_RDONLY can be (and usually is) 0 which needs to be treated
|
|||
|
|
specially. */
|
|||
|
|
case TARGET_O_RDONLY :
|
|||
|
|
case TARGET_O_WRONLY :
|
|||
|
|
case TARGET_O_RDWR :
|
|||
|
|
if ((target_val & (TARGET_O_RDONLY | TARGET_O_WRONLY | TARGET_O_RDWR))
|
|||
|
|
== m->target_val)
|
|||
|
|
host_val |= m->host_val;
|
|||
|
|
break;
|
|||
|
|
default :
|
|||
|
|
if ((m->target_val & target_val) == m->target_val)
|
|||
|
|
host_val |= m->host_val;
|
|||
|
|
break;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
return host_val;
|
|||
|
|
}
|