rdwr.c

早期freebsd实现

/*-
 * Copyright (c) 1980, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef lint
static char sccsid[] = "@(#)rdwr.c	8.1 (Berkeley) 6/6/93";
#endif /* not lint */

/*
 * This routine is used to access the debuggee process from
 * outside the "process" module.
 *
 * They invoke "pio" which eventually leads to a call to "ptrace".
 * The system generates an I/O error when a ptrace fails, we catch
 * that here and assume its due to a misguided address.
 */

#include "defs.h"
#include <errno.h>
#include "process.h"
#include "process.rep"

#	include "pxinfo.h"

typedef int INTFUNC();

extern INTFUNC *onsyserr();

LOCAL badaddr;
LOCAL PIO_OP rwflg;
LOCAL rwerr();

/*
 * Read/Write to the process' data area.
 */

drdwr(rw, buff, addr, nbytes)
PIO_OP rw;
char *buff;
ADDRESS addr;
int nbytes;
{
	INTFUNC *f;

	f = onsyserr(EIO, rwerr);
	badaddr = addr;
	rwflg = rw;
	pio(process, rw, DATASEG, buff, addr, nbytes);
	onsyserr(EIO, f);
}

/*
 * Error handler.
 */

LOCAL rwerr()
{
	error("bad %s process address 0x%x",
		rwflg == PREAD ? "read" : "write", badaddr);
}