Linux Application Debugger

Table of Contents

• Introduction
  • LDB Interface
  • Using the LDB
• Commands Comparison
  • Entering and Exiting the Debugger
  • Debugger Commands
  • Running Programs
  • Stopping and Continuing
  • Examining the Stack
  • Examining Source Files
  • Examining Data
  • Using Languages
  • Examining the Symbol Table
  • Altering Execution
  • Controlling Debugger
  • Canned Sequences of Commands
• LDB Sample Session
• Copyright Notice
• Disclaimer

Introduction

Commands Comparison

This section provides a comparative analysis of the LDB and GNU Debugger commands. The LDB commands are grouped by their functionality, similar to the way they are listed in GDB documentation, and divided into three color groups:

GDB commands supported by LDB

GDB commands partially supported by LDB

GDB commands not supported by LDB

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LDB Sample Session

This is a sample of the code generated by the Linux Application Debugger during the debugging session. User input is emphasized in this font.

[prompt]$ ldb maincall
Linux Application Debugger, Version 5.0.1 Build 20010509.
Copyright (c) 2001 Intel Corporation. All Rights Reserved.
Linux Debugger.
Gdb-subset text interface version.
File /home/lmcglinc/test/filecalls/maincall loaded, 32-bit executable
(ldb) break main
Breakpoint 1 at 0x8048113: file maincall.c, line 15.
(ldb) run
Executable has no shared library list.
Unable to set breakpoint on exception throw.
Starting program: maincall
Breakpoint 1: file maincall.c line 15.
15      {
(ldb) list
10      extern int inc7(int, int);
11      extern int inc8(int, int);
12      extern int inc9(int, int);
13
14      main( int argc, char *argv[])
15      {
16          /* Test the call stack */
17          int a;
18          int b;
19          int c;
20
(ldb) next
21          switch(argc)
(ldb) next
25                        argv[0]);
(ldb) list
20
21          switch(argc)
22          {
23            case 1:
24                fprintf(stdout, "argv: %s\n",
25                        argv[0]);
26                break;
27            case 2:
28                fprintf(stdout, "argv: %s %s\n",
29                        argv[0],argv[1]);
30                break;
(ldb) break inc1
Breakpoint 2 at 0x80483a3: file inc1.c, line 4.
(ldb) continue
argv: maincall
Breakpoint 2: file inc1.c line 4.
4       {
(ldb) list
1       #include 
2
3       inc1( int a, int b )
4       {
5           /* Test the call stack */
6           int c;
7           c = inc2( ++a, ++b);
8           fprintf(stdout, "Result: %d  (inc1 original values a:%d b:%d)\n", c, a, b);
9           return(a+b);
(ldb) next
7           c = inc2( ++a, ++b);
(ldb) print a
$2 = 1
(ldb) print b
$3 = 1
(ldb) next
Result: 22  (inc9 original values a:10 b:10)
Result: 20  (inc8 original values a:9 b:9)
Result: 18  (inc7 original values a:8 b:8)
Result: 16  (inc6 original values a:7 b:7)
Result: 14  (inc5 original values a:6 b:6)
Result: 12  (inc4 original values a:5 b:5)
Result: 10  (inc3 original values a:4 b:4)
Result: 8  (inc2 original values a:3 b:3)
8           fprintf(stdout, "Result: %d  (inc1 original values a:%d b:%d)\n", c, a, b);
(ldb) print c
$4 = 6
(ldb) continue
Result: 6  (inc1 original values a:2 b:2)
Result: 4  (inc0 original values a:1 b:1)
Result: 2  (original values a:0 b:0)
(ldb) quit

[prompt]$

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Copyright Notice

Copyright © 2001 Intel Corporation. All rights reserved.

*Other names and brands may be claimed as the property of others.

Intel and Itanium are trademarks or registered trademarks of Intel Corporation or
its subsidiaries in the United States and in other countries.

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Disclaimer

INFORMATION IN THIS ONLINE HELP FILE IS PROVIDED IN CONNECTION WITH INTEL® PRODUCTS. THIS INFORMATION IS PROVIDED "AS IS" FOR THE ASSOCIATED PROCESSORS. INTEL ASSUMES NO LIABILITY WHATSOEVER, AND INTEL DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY RELATING TO USE OF THIS INFORMATION, INCLUDING LIABILITY OR WARRANTY RELATING TO MERCHANTABILITY, FITNESS FOR ANY PARTICULAR PURPOSE, INFRINGEMENT OF ANY PATENT, COPYRIGHT, OR OTHER INTELLECTUAL PROPERTY RIGHT, OR ANY WARRANTY OTHERWISE ARISING OUT OF ANY PROPOSAL, SPECIFICATION OR SAMPLE.

Intel products are not intended for use in medical, life saving, or life sustaining applications. Intel may make changes to specifications and product descriptions at any time, without notice.

Designers must not rely on the absence or characteristic of any features or instructions marked "reserved" or "undefined" for processors. Intel reserves these for future definition and shall have no responsibility whatsoever for conflicts or incompatibilities arising from future changes to them.

The processors referred to in this online help may contain design defects or errors known as errata which may cause the product to deviate from published specifications. Current characterized errata are available on request.

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