From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gdb-return-21464-listarch-gdb=sources.redhat.com@sources.redhat.com>
Received: (qmail 10314 invoked by alias); 9 May 2005 19:44:20 -0000
Mailing-List: contact gdb-help@sources.redhat.com; run by ezmlm
Precedence: bulk
List-Subscribe: <mailto:gdb-subscribe@sources.redhat.com>
List-Archive: <http://sources.redhat.com/ml/gdb/>
List-Post: <mailto:gdb@sources.redhat.com>
List-Help: <mailto:gdb-help@sources.redhat.com>, <http://sources.redhat.com/ml/#faqs>
Sender: gdb-owner@sources.redhat.com
Received: (qmail 10246 invoked from network); 9 May 2005 19:44:09 -0000
Received: from unknown (HELO mail.siemenscom.com) (12.146.131.10)
  by sourceware.org with SMTP; 9 May 2005 19:44:09 -0000
Received: from fdns2.rolm.com (localhost [127.0.0.1])
	by mail.siemenscom.com (8.12.10/8.12.10) with ESMTP id j49JJM0O026402
	for <gdb@sources.redhat.com>; Mon, 9 May 2005 12:19:23 -0700
Received: from stca200a.bus.sc.rolm.com (stca200a.bus.sc.rolm.com [165.218.68.180])
	by fdns2.rolm.com (8.12.10/8.12.10) with ESMTP id j49Ji75Z029963
	for <gdb@sources.redhat.com>; Mon, 9 May 2005 12:44:07 -0700 (PDT)
Received: by stca200a.bus.sc.rolm.com with Internet Mail Service (5.5.2657.72)
	id <KDQ72PVA>; Mon, 9 May 2005 12:44:06 -0700
Message-ID: <2DA8F872430BE8469BF0F403A6103F9205CFC9@stca20aa.bocc.icn.siemens.com>
From: "Bloch, Jack" <jack.bloch@siemens.com>
To: gdb@sources.redhat.com
Subject: Reading target registers
Date: Mon, 09 May 2005 19:44:00 -0000
MIME-Version: 1.0
Content-Type: text/plain;
	charset="UTF-8"
X-SW-Source: 2005-05/txt/msg00119.txt.bz2

While this is not a direct GDB question, I'm hoping someone can answer me. I
have an application which uses the ptrace interface to attach to a target
process and read the target registers (I'm specifically interested in the
EIP). It will run on a SuSE 2.6 Kernel x86 based machine. My code is below.


#include <sys/types.h>
#include <sys/ptrace.h>
#include <sys/wait.h>
#include <sys/reg.h>
#include <sys/user.h>
#include <linux/stddef.h>
#include <linux/version.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <link.h>
#include <fcntl.h>
#include <limits.h>
#include <dirent.h>
#include <pthread.h>
#ifndef BFD64
   #define BFD64
#endif
#include <bfd.h>
#include <signal.h>
#include "tracer.h"


int main (int     p_argc,
          char    **p_argv)

{

   int             l_ret;
   pid_t           l_pid
   unsigned long   l_regs[17];
   
   /***********************************************************************/
   /* i have ommitted the code which retrieves the command line arguments */
   /***********************************************************************/

   if ((l_ret = ptrace(PTRACE_ATTACH,l_pid,NULL,NULL)) < 0)
   { 
      l_ret = errno; 
      printf("ERROR %s ATTACHING TO TARGET !!!\n",strerror(l_ret);
      return(l_ret);
   }
   if ((l_ret = ptrace(PTRACE_GETREGS,l_pid,NULL,&l_regs)) < 0)
   { 
      l_ret = errno; 
      printf("ERROR %s READING TARGET REGISTERS !!!\n",strerror(l_ret);
      return(l_ret);
   }
   printf("CURRENT EIP 0x%x\n",l_regs[EIP]);
   return(l_ret);
}


The EIP value is always incorrect. Any ideas. Please CC me directly on any
response.


Regards,


Jack