865 lines
18 KiB
C
865 lines
18 KiB
C
/* Remote target callback routines.
|
||
Copyright 1995, 1996, 1997, 2000, 2002, 2003, 2004
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||
Free Software Foundation, Inc.
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||
Contributed by Cygnus Solutions.
|
||
|
||
This file is part of GDB.
|
||
|
||
This program is free software; you can redistribute it and/or modify
|
||
it under the terms of the GNU General Public License as published by
|
||
the Free Software Foundation; either version 2 of the License, or
|
||
(at your option) any later version.
|
||
|
||
This program is distributed in the hope that it will be useful,
|
||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
GNU General Public License for more details.
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||
|
||
You should have received a copy of the GNU General Public License
|
||
along with GAS; see the file COPYING. If not, write to the Free Software
|
||
Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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||
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||
/* This file provides a standard way for targets to talk to the host OS
|
||
level. */
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||
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#ifdef HAVE_CONFIG_H
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#include "cconfig.h"
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#endif
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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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#ifdef HAVE_STRING_H
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#include <string.h>
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#else
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#ifdef HAVE_STRINGS_H
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#include <strings.h>
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#endif
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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 <sys/types.h>
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#include <sys/stat.h>
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#include "gdb/callback.h"
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#include "targ-vals.h"
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||
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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/* ??? sim_cb_printf should be cb_printf, but until the callback support is
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broken out of the simulator directory, these are here to not require
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sim-utils.h. */
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||
void sim_cb_printf PARAMS ((host_callback *, const char *, ...));
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void sim_cb_eprintf PARAMS ((host_callback *, const char *, ...));
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extern CB_TARGET_DEFS_MAP cb_init_syscall_map[];
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extern CB_TARGET_DEFS_MAP cb_init_errno_map[];
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extern CB_TARGET_DEFS_MAP cb_init_open_map[];
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extern int system PARAMS ((const char *));
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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 void os_flush_stdout PARAMS ((host_callback *));
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static int os_write_stderr PARAMS ((host_callback *, const char *, int));
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static void os_flush_stderr PARAMS ((host_callback *));
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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 void os_vprintf_filtered PARAMS ((host_callback *, const char *, va_list));
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static void os_evprintf_filtered PARAMS ((host_callback *, const char *, va_list));
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static void os_error PARAMS ((host_callback *, const char *, ...));
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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->fd_buddy[fd] < 0)
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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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int i, next;
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result = fdbad (p, fd);
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if (result)
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return result;
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/* If this file descripter has one or more buddies (originals /
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duplicates from a dup), just remove it from the circular list. */
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for (i = fd; (next = p->fd_buddy[i]) != fd; )
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i = next;
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if (fd != i)
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p->fd_buddy[i] = p->fd_buddy[fd];
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else
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result = wrap (p, close (fdmap (p, fd)));
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p->fd_buddy[fd] = -1;
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return result;
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}
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/* taken from gdb/util.c:notice_quit() - should be in a library */
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#if defined(__GO32__) || defined (_MSC_VER)
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static int
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os_poll_quit (p)
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host_callback *p;
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{
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#if defined(__GO32__)
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int kbhit ();
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int getkey ();
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if (kbhit ())
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{
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int k = getkey ();
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if (k == 1)
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{
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return 1;
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}
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else if (k == 2)
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{
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return 1;
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}
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else
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{
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sim_cb_eprintf (p, "CTRL-A to quit, CTRL-B to quit harder\n");
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}
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}
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#endif
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#if defined (_MSC_VER)
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/* NB - this will not compile! */
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int k = win32pollquit();
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if (k == 1)
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return 1;
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else if (k == 2)
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return 1;
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#endif
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return 0;
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}
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#else
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#define os_poll_quit 0
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#endif /* defined(__GO32__) || defined(_MSC_VER) */
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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 cb_host_to_target_errno (p, 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->fd_buddy[i] < 0)
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{
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int f = open (name, cb_target_to_host_open (p, flags), 0644);
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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->fd_buddy[i] = i;
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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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int real_fd;
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result = fdbad (p, fd);
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if (result)
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return result;
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real_fd = fdmap (p, fd);
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switch (real_fd)
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{
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default:
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||
result = wrap (p, write (real_fd, buf, len));
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break;
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case 1:
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result = p->write_stdout (p, buf, len);
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break;
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case 2:
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result = p->write_stderr (p, buf, len);
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break;
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}
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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 ATTRIBUTE_UNUSED;
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const char *buf;
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int len;
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{
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return fwrite (buf, 1, len, stdout);
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}
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static void
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os_flush_stdout (p)
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host_callback *p ATTRIBUTE_UNUSED;
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{
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fflush (stdout);
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}
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static int
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os_write_stderr (p, buf, len)
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host_callback *p ATTRIBUTE_UNUSED;
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const char *buf;
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int len;
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{
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return fwrite (buf, 1, len, stderr);
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}
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static void
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os_flush_stderr (p)
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host_callback *p ATTRIBUTE_UNUSED;
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{
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fflush (stderr);
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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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||
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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;
|
||
{
|
||
return wrap (p, time (t));
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}
|
||
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||
|
||
static int
|
||
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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||
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||
static int
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||
os_stat (p, file, buf)
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host_callback *p;
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||
const char *file;
|
||
struct stat *buf;
|
||
{
|
||
/* ??? There is an issue of when to translate to the target layout.
|
||
One could do that inside this function, or one could have the
|
||
caller do it. It's more flexible to let the caller do it, though
|
||
I'm not sure the flexibility will ever be useful. */
|
||
return wrap (p, stat (file, buf));
|
||
}
|
||
|
||
static int
|
||
os_fstat (p, fd, buf)
|
||
host_callback *p;
|
||
int fd;
|
||
struct stat *buf;
|
||
{
|
||
if (fdbad (p, fd))
|
||
return -1;
|
||
/* ??? There is an issue of when to translate to the target layout.
|
||
One could do that inside this function, or one could have the
|
||
caller do it. It's more flexible to let the caller do it, though
|
||
I'm not sure the flexibility will ever be useful. */
|
||
return wrap (p, fstat (fdmap (p, fd), buf));
|
||
}
|
||
|
||
static int
|
||
os_ftruncate (p, fd, len)
|
||
host_callback *p;
|
||
int fd;
|
||
long len;
|
||
{
|
||
int result;
|
||
|
||
result = fdbad (p, fd);
|
||
if (result)
|
||
return result;
|
||
result = wrap (p, ftruncate (fdmap (p, fd), len));
|
||
return result;
|
||
}
|
||
|
||
static int
|
||
os_truncate (p, file, len)
|
||
host_callback *p;
|
||
const char *file;
|
||
long len;
|
||
{
|
||
return wrap (p, truncate (file, len));
|
||
}
|
||
|
||
static int
|
||
os_shutdown (p)
|
||
host_callback *p;
|
||
{
|
||
int i, next, j;
|
||
for (i = 0; i < MAX_CALLBACK_FDS; i++)
|
||
{
|
||
int do_close = 1;
|
||
|
||
next = p->fd_buddy[i];
|
||
if (next < 0)
|
||
continue;
|
||
do
|
||
{
|
||
j = next;
|
||
if (j == MAX_CALLBACK_FDS)
|
||
do_close = 0;
|
||
next = p->fd_buddy[j];
|
||
p->fd_buddy[j] = -1;
|
||
/* At the initial call of os_init, we got -1, 0, 0, 0, ... */
|
||
if (next < 0)
|
||
{
|
||
p->fd_buddy[i] = -1;
|
||
do_close = 0;
|
||
break;
|
||
}
|
||
}
|
||
while (j != i);
|
||
if (do_close)
|
||
close (p->fdmap[i]);
|
||
}
|
||
return 1;
|
||
}
|
||
|
||
static int
|
||
os_init (p)
|
||
host_callback *p;
|
||
{
|
||
int i;
|
||
|
||
os_shutdown (p);
|
||
for (i = 0; i < 3; i++)
|
||
{
|
||
p->fdmap[i] = i;
|
||
p->fd_buddy[i] = i - 1;
|
||
}
|
||
p->fd_buddy[0] = MAX_CALLBACK_FDS;
|
||
p->fd_buddy[MAX_CALLBACK_FDS] = 2;
|
||
|
||
p->syscall_map = cb_init_syscall_map;
|
||
p->errno_map = cb_init_errno_map;
|
||
p->open_map = cb_init_open_map;
|
||
|
||
return 1;
|
||
}
|
||
|
||
/* DEPRECATED */
|
||
|
||
/* VARARGS */
|
||
static void
|
||
#ifdef ANSI_PROTOTYPES
|
||
os_printf_filtered (host_callback *p ATTRIBUTE_UNUSED, const char *format, ...)
|
||
#else
|
||
os_printf_filtered (p, va_alist)
|
||
host_callback *p;
|
||
va_dcl
|
||
#endif
|
||
{
|
||
va_list args;
|
||
#ifdef ANSI_PROTOTYPES
|
||
va_start (args, format);
|
||
#else
|
||
char *format;
|
||
|
||
va_start (args);
|
||
format = va_arg (args, char *);
|
||
#endif
|
||
|
||
vfprintf (stdout, format, args);
|
||
va_end (args);
|
||
}
|
||
|
||
/* VARARGS */
|
||
static void
|
||
#ifdef ANSI_PROTOTYPES
|
||
os_vprintf_filtered (host_callback *p ATTRIBUTE_UNUSED, const char *format, va_list args)
|
||
#else
|
||
os_vprintf_filtered (p, format, args)
|
||
host_callback *p;
|
||
const char *format;
|
||
va_list args;
|
||
#endif
|
||
{
|
||
vprintf (format, args);
|
||
}
|
||
|
||
/* VARARGS */
|
||
static void
|
||
#ifdef ANSI_PROTOTYPES
|
||
os_evprintf_filtered (host_callback *p ATTRIBUTE_UNUSED, const char *format, va_list args)
|
||
#else
|
||
os_evprintf_filtered (p, format, args)
|
||
host_callback *p;
|
||
const char *format;
|
||
va_list args;
|
||
#endif
|
||
{
|
||
vfprintf (stderr, format, args);
|
||
}
|
||
|
||
/* VARARGS */
|
||
static void
|
||
#ifdef ANSI_PROTOTYPES
|
||
os_error (host_callback *p ATTRIBUTE_UNUSED, const char *format, ...)
|
||
#else
|
||
os_error (p, va_alist)
|
||
host_callback *p;
|
||
va_dcl
|
||
#endif
|
||
{
|
||
va_list args;
|
||
#ifdef ANSI_PROTOTYPES
|
||
va_start (args, format);
|
||
#else
|
||
char *format;
|
||
|
||
va_start (args);
|
||
format = va_arg (args, char *);
|
||
#endif
|
||
|
||
vfprintf (stderr, format, args);
|
||
fprintf (stderr, "\n");
|
||
|
||
va_end (args);
|
||
exit (1);
|
||
}
|
||
|
||
host_callback default_callback =
|
||
{
|
||
os_close,
|
||
os_get_errno,
|
||
os_isatty,
|
||
os_lseek,
|
||
os_open,
|
||
os_read,
|
||
os_read_stdin,
|
||
os_rename,
|
||
os_system,
|
||
os_time,
|
||
os_unlink,
|
||
os_write,
|
||
os_write_stdout,
|
||
os_flush_stdout,
|
||
os_write_stderr,
|
||
os_flush_stderr,
|
||
|
||
os_stat,
|
||
os_fstat,
|
||
|
||
os_ftruncate,
|
||
os_truncate,
|
||
|
||
os_poll_quit,
|
||
|
||
os_shutdown,
|
||
os_init,
|
||
|
||
os_printf_filtered, /* deprecated */
|
||
|
||
os_vprintf_filtered,
|
||
os_evprintf_filtered,
|
||
os_error,
|
||
|
||
0, /* last errno */
|
||
|
||
{ 0, }, /* fdmap */
|
||
{ -1, }, /* fd_buddy */
|
||
|
||
0, /* syscall_map */
|
||
0, /* errno_map */
|
||
0, /* open_map */
|
||
0, /* signal_map */
|
||
0, /* stat_map */
|
||
|
||
HOST_CALLBACK_MAGIC,
|
||
};
|
||
|
||
/* Read in a file describing the target's system call values.
|
||
E.g. maybe someone will want to use something other than newlib.
|
||
This assumes that the basic system call recognition and value passing/
|
||
returning is supported. So maybe some coding/recompilation will be
|
||
necessary, but not as much.
|
||
|
||
If an error occurs, the existing mapping is not changed. */
|
||
|
||
CB_RC
|
||
cb_read_target_syscall_maps (cb, file)
|
||
host_callback *cb;
|
||
const char *file;
|
||
{
|
||
CB_TARGET_DEFS_MAP *syscall_map, *errno_map, *open_map, *signal_map;
|
||
const char *stat_map;
|
||
FILE *f;
|
||
|
||
if ((f = fopen (file, "r")) == NULL)
|
||
return CB_RC_ACCESS;
|
||
|
||
/* ... read in and parse file ... */
|
||
|
||
fclose (f);
|
||
return CB_RC_NO_MEM; /* FIXME:wip */
|
||
|
||
/* Free storage allocated for any existing maps. */
|
||
if (cb->syscall_map)
|
||
free (cb->syscall_map);
|
||
if (cb->errno_map)
|
||
free (cb->errno_map);
|
||
if (cb->open_map)
|
||
free (cb->open_map);
|
||
if (cb->signal_map)
|
||
free (cb->signal_map);
|
||
if (cb->stat_map)
|
||
free ((PTR) cb->stat_map);
|
||
|
||
cb->syscall_map = syscall_map;
|
||
cb->errno_map = errno_map;
|
||
cb->open_map = open_map;
|
||
cb->signal_map = signal_map;
|
||
cb->stat_map = stat_map;
|
||
|
||
return CB_RC_OK;
|
||
}
|
||
|
||
/* Translate the target's version of a syscall number to the host's.
|
||
This isn't actually the host's version, rather a canonical form.
|
||
??? Perhaps this should be renamed to ..._canon_syscall. */
|
||
|
||
int
|
||
cb_target_to_host_syscall (cb, target_val)
|
||
host_callback *cb;
|
||
int target_val;
|
||
{
|
||
CB_TARGET_DEFS_MAP *m;
|
||
|
||
for (m = &cb->syscall_map[0]; m->target_val != -1; ++m)
|
||
if (m->target_val == target_val)
|
||
return m->host_val;
|
||
|
||
return -1;
|
||
}
|
||
|
||
/* FIXME: sort tables if large.
|
||
Alternatively, an obvious improvement for errno conversion is
|
||
to machine generate a function with a large switch(). */
|
||
|
||
/* Translate the host's version of errno to the target's. */
|
||
|
||
int
|
||
cb_host_to_target_errno (cb, host_val)
|
||
host_callback *cb;
|
||
int host_val;
|
||
{
|
||
CB_TARGET_DEFS_MAP *m;
|
||
|
||
for (m = &cb->errno_map[0]; m->host_val; ++m)
|
||
if (m->host_val == host_val)
|
||
return m->target_val;
|
||
|
||
/* ??? Which error to return in this case is up for grabs.
|
||
Note that some missing values may have standard alternatives.
|
||
For now return 0 and require caller to deal with it. */
|
||
return 0;
|
||
}
|
||
|
||
/* Given a set of target bitmasks for the open system call,
|
||
return the host equivalent.
|
||
Mapping open flag values is best done by looping so there's no need
|
||
to machine generate this function. */
|
||
|
||
int
|
||
cb_target_to_host_open (cb, target_val)
|
||
host_callback *cb;
|
||
int target_val;
|
||
{
|
||
int host_val = 0;
|
||
CB_TARGET_DEFS_MAP *m;
|
||
|
||
for (m = &cb->open_map[0]; m->host_val != -1; ++m)
|
||
{
|
||
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;
|
||
/* Handle the host/target differentiating between binary and
|
||
text mode. Only one case is of importance */
|
||
#if ! defined (TARGET_O_BINARY) && defined (O_BINARY)
|
||
host_val |= O_BINARY;
|
||
#endif
|
||
break;
|
||
default :
|
||
if ((m->target_val & target_val) == m->target_val)
|
||
host_val |= m->host_val;
|
||
break;
|
||
}
|
||
}
|
||
|
||
return host_val;
|
||
}
|
||
|
||
/* Utility for cb_host_to_target_stat to store values in the target's
|
||
stat struct. */
|
||
|
||
static void
|
||
store (p, size, val, big_p)
|
||
char *p;
|
||
int size;
|
||
long val; /* ??? must be as big as target word size */
|
||
int big_p;
|
||
{
|
||
if (big_p)
|
||
{
|
||
p += size;
|
||
while (size-- > 0)
|
||
{
|
||
*--p = val;
|
||
val >>= 8;
|
||
}
|
||
}
|
||
else
|
||
{
|
||
while (size-- > 0)
|
||
{
|
||
*p++ = val;
|
||
val >>= 8;
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Translate a host's stat struct into a target's.
|
||
If HS is NULL, just compute the length of the buffer required,
|
||
TS is ignored.
|
||
|
||
The result is the size of the target's stat struct,
|
||
or zero if an error occurred during the translation. */
|
||
|
||
int
|
||
cb_host_to_target_stat (cb, hs, ts)
|
||
host_callback *cb;
|
||
const struct stat *hs;
|
||
PTR ts;
|
||
{
|
||
const char *m = cb->stat_map;
|
||
char *p;
|
||
int big_p = 0;
|
||
|
||
if (hs == NULL)
|
||
ts = NULL;
|
||
p = ts;
|
||
|
||
while (m)
|
||
{
|
||
char *q = strchr (m, ',');
|
||
int size;
|
||
|
||
/* FIXME: Use sscanf? */
|
||
if (q == NULL)
|
||
{
|
||
/* FIXME: print error message */
|
||
return 0;
|
||
}
|
||
size = atoi (q + 1);
|
||
if (size == 0)
|
||
{
|
||
/* FIXME: print error message */
|
||
return 0;
|
||
}
|
||
|
||
if (hs != NULL)
|
||
{
|
||
if (strncmp (m, "st_dev", q - m) == 0)
|
||
store (p, size, hs->st_dev, big_p);
|
||
else if (strncmp (m, "st_ino", q - m) == 0)
|
||
store (p, size, hs->st_ino, big_p);
|
||
/* FIXME:wip */
|
||
else
|
||
store (p, size, 0, big_p); /* unsupported field, store 0 */
|
||
}
|
||
|
||
p += size;
|
||
m = strchr (q, ':');
|
||
if (m)
|
||
++m;
|
||
}
|
||
|
||
return p - (char *) ts;
|
||
}
|
||
|
||
/* Cover functions to the vfprintf callbacks.
|
||
|
||
??? If one thinks of the callbacks as a subsystem onto itself [or part of
|
||
a larger "remote target subsystem"] with a well defined interface, then
|
||
one would think that the subsystem would provide these. However, until
|
||
one is allowed to create such a subsystem (with its own source tree
|
||
independent of any particular user), such a critter can't exist. Thus
|
||
these functions are here for the time being. */
|
||
|
||
void
|
||
sim_cb_printf (host_callback *p, const char *fmt, ...)
|
||
{
|
||
va_list ap;
|
||
|
||
va_start (ap, fmt);
|
||
p->vprintf_filtered (p, fmt, ap);
|
||
va_end (ap);
|
||
}
|
||
|
||
void
|
||
sim_cb_eprintf (host_callback *p, const char *fmt, ...)
|
||
{
|
||
va_list ap;
|
||
|
||
va_start (ap, fmt);
|
||
p->evprintf_filtered (p, fmt, ap);
|
||
va_end (ap);
|
||
}
|