DS-5_WorkshopDS-5工程建立

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DS-5 Workshop: Linux Kernel and Application Debug, Trace and

Profile on Snowball

This workshop demonstrates the features of the DS-5 Debugger by debugging and tracing U-Boot, the Linux

kernel and a game called Gnometris that is an ARM Linux application running on the target. It also

demonstrates the ARM Streamline profiler using an application called Xaos. It will introduce the views of

DS-5 Debugger and ARM Streamline and demonstrate their features. Some of the features are used in

explicit instructions that you are expected to follow and are marked with this symbol . Other features are

only mentioned and are not critical to the flow of the workshop. You don't have to use them, but you are

generally encouraged to try them out anyway.

We will use a Snowball board as the target, but DS-5 can also be used with any ARM Linux target that has

networking or the Real Time System Models that come with DS-5. The Gnometris and Xaos applications

that we will be using are supplied as examples with DS-5.

(version 31 January 2013; v5.13 d1622; HW; HWCortex-A9; DSTREAM; DSTREAMLinaro; DSTREAMSnowball; Snowball)

page 1 of 99

Contents

DS-5 Workshop: Linux Kernel and Application Debug, Trace and Profile on Snowball ................................................... 1

Preparation ..................................................................................................................................................................................... 2

Host Setup ................................................................................................................................................................................. 2

Target Setup .............................................................................................................................................................................. 2

Starting Eclipse .......................................................................................................................................................................... 2

Installing a DS-5 License ........................................................................................................................................................... 2

Bare-metal Debug and Trace (U-Boot) ........................................................................................................................................... 4

Setting up your own target: Download, build and setup U-Boot ................................................................................................. 4

Connect the hardware................................................................................................................................................................ 4

Debugging U-Boot on the target ................................................................................................................................................ 5

Quick tour of the debugger ...................................................................................................................................................... 10

Trace view ............................................................................................................................................................................... 12

Registers view ......................................................................................................................................................................... 15

Watchpoints ............................................................................................................................................................................. 15

Functions view ......................................................................................................................................................................... 16

Kernel and module debug ............................................................................................................................................................. 20

Setting up your own target: Download the Linux kernel symbols and sources ........................................................................ 20

Debugging the kernel before the MMU is on ............................................................................................................................ 20

Debugging the kernel initialisation after the MMU is on ........................................................................................................... 22

Peripheral Registers ................................................................................................................................................................ 28

Application debug ......................................................................................................................................................................... 33

Starting the X server on the Host ............................................................................................................................................. 33

Importing Gnometris ................................................................................................................................................................ 34

Connecting to the Target ......................................................................................................................................................... 34

Debugging Gnometris on the Target ........................................................................................................................................ 36

Detailed Debugging ................................................................................................................................................................. 40

Functions view ......................................................................................................................................................................... 40

Breakpoints .............................................................................................................................................................................. 41

Source and Disassembly views ............................................................................................................................................... 43

Variables view .......................................................................................................................................................................... 44

Stepping ................................................................................................................................................................................... 48

Registers view ......................................................................................................................................................................... 49

Debug Control view ................................................................................................................................................................. 50

Call Stack ................................................................................................................................................................................. 50

Play the game .......................................................................................................................................................................... 51

Gaming the game .................................................................................................................................................................... 52

Expressions view ..................................................................................................................................................................... 52

Expression Inspector view ....................................................................................................................................................... 53

Memory view ............................................................................................................................................................................ 53

Commands and History views ................................................................................................................................................. 56

Scripts view .............................................................................................................................................................................. 57

Breakpoint scripts .................................................................................................................................................................... 57

Show off your skills .................................................................................................................................................................. 58

Advanced Breakpoints ............................................................................................................................................................. 58

More features in Source and Disassembly views .................................................................................................................... 58

Shared Libraries and Modules view ......................................................................................................................................... 60

Change of topic ............................................................................................................................................................................ 61

ARM Streamline Workshop using Xaos on Snowball ..................................................................................................... 62

Introduction to ARM Streamline .................................................................................................................................................... 63

Preparation ................................................................................................................................................................................... 63

Host Setup ............................................................................................................................................................................... 63

Target Setup ............................................................................................................................................................................ 63

Starting Eclipse ........................................................................................................................................................................ 63

Installing a DS-5 License ......................................................................................................................................................... 63

Importing Xaos ......................................................................................................................................................................... 64

Install Xaos to the target .......................................................................................................................................................... 64

Set the Capture Options .......................................................................................................................................................... 66

Configure Counters .................................................................................................................................................................. 67

Capture some profile data ............................................................................................................................................................ 68

Examine the Report ...................................................................................................................................................................... 70

Timeline view – a first look at the Streamline report ................................................................................................................ 70

Configuring Charts ................................................................................................................................................................... 73

Power analysis ......................................................................................................................................................................... 74

Call Paths view ........................................................................................................................................................................ 75

Functions view ......................................................................................................................................................................... 77

Code view ................................................................................................................................................................................ 77

Call Graph view ....................................................................................................................................................................... 78

Stack view ................................................................................................................................................................................ 79

Log view and Annotations ........................................................................................................................................................ 80

page 2 of 99

Advanced Streamline.................................................................................................................................................................... 80

Reanalyze Streamline data ...................................................................................................................................................... 80

Import Captures ....................................................................................................................................................................... 82

Troubleshooting Streamline .......................................................................................................................................................... 83

Back to Debugging ....................................................................................................................................................................... 84

Debugging an application that is already running .................................................................................................................... 84

Advanced Debug Configurations ............................................................................................................................................. 85

Debugging Threads (“extra credit”) .......................................................................................................................................... 85

Debugging on the RTSM .............................................................................................................................................................. 86

Other DS-5 features you didn't see ............................................................................................................................................... 86

Finished! ....................................................................................................................................................................................... 86

Appendix A: Setup ........................................................................................................................................................................ 87

Host Setup ............................................................................................................................................................................... 87

Importing projects .................................................................................................................................................................... 87

Importing distribution................................................................................................................................................................ 87

Importing Gnometris ................................................................................................................................................................ 88

Changing Gnometris ................................................................................................................................................................ 89

Importing Xaos ......................................................................................................................................................................... 90

Creating a Target Connection .................................................................................................................................................. 90

Appendix B: Snowball ................................................................................................................................................................... 92

Board details and connections ................................................................................................................................................. 92

Write a target image to a microSD card ................................................................................................................................... 92

Serial setup .............................................................................................................................................................................. 92

Flash an eMMC image to the board ......................................................................................................................................... 94

Linaro Linux target setup ......................................................................................................................................................... 94

U-Boot download and debug setup .......................................................................................................................................... 95

Linux kernel download and debug setup.................................................................................................................................. 95

Kernel module debug (modex) build and setup ....................................................................................................................... 97

Setting a static IP address ....................................................................................................................................................... 98

ARM Energy Probe setup ........................................................................................................................................................ 99

Preparation

If the host and target have already been setup for you, you can skip down to Starting Eclipse below.

Otherwise you’ll need to start by installing some software.

Host Setup

DS-5 can be used on Windows and Linux hosts. If your host has not already been setup for you then you

will need to follow the instructions in the appendix on page 87

Target Setup

For the workshop you’ll be supplied with a Snowball board that already has U-Boot, a Linux kernel and root

filesystem on it. If you want to setup your own target please see Appendix B: Snowball: Linaro Linux target

setup page 94.Serial setup

Starting Eclipse

 Start > All Programs > ARM DS-5 > Eclipse for DS-5 and choose a location for the workspace

where Eclipse projects will be stored. The default workspace location is fine.

 If this is the first time you've started DS-5 you will see the "Welcome to ARM DS-5" home page;

click Go to the workbench. You can get the Welcome page back if you want it later by choosing Help

> Welcome.

Installing a DS-5 License

In order to use DS-5 for this workshop you will need to have a license for DS-5 Basic Edition, either a full

or evaluation license. (A license for Professional Edition will also work.) If the workshop has been setup

for you then you will already have a license. If you don’t have a license a dialog will open with an

explanation and a button to Open License Manager.... You can get an evaluation or full license by opening

the license manager using Help > ARM License Manager..., clicking the Obtain License... button and

following the instructions. You will need to be connected to the internet. When you receive the license file,

you need to add it by using the Add License... button.

page 3 of 99

Eclipse views (a brief digression)

The Eclipse window is divided into a number of rectangular panes. Each pane contains one or more views.

Each view has a tab at the top with the view’s name. For example, in the screenshot on the cover, Debug

Control, Project Explorer and Remote Systems are three views in the same pane. Views of source files

are named after their files, for example main.cpp.

You can easily rearrange panes and views. Dragging the dividing lines between panes changes their size.

Clicking on a view’s tab brings it to the front. You can drag a view’s tab to move the view to another pane

or to split a pane vertically or horizontally. You can even drag a view out of the Eclipse window entirely to

create a new window. Double-clicking on the tabs of a pane will expand the pane to fill the window

(maximize). Double-clicking it again will restore it down.

You can close a view by clicking the close button in its tab. If a view you want is not open, you can open it

by using the Window > Show view > menu.

A particular grouping of views is called a perspective. For example, there is a DS-5 Debug perspective that

we will be using, but there is also a C/C++ perspective and others. Eclipse provides ways to switch quickly

between perspectives and to create your own custom perspectives from a group of views.

Some of the DS-5 views such as Variables, Expressions, Registers, Functions and Modules have

columns. You can change the width of the columns by dragging the dividing lines in the column headers

right or left. You can change which columns are displayed by right-clicking on the column headers and

choosing from the context menu. In Functions and Modules you can sort by any of the columns by clicking

on the column heading. If you shift-click a different columns you can set further minor sort keys which

shows as the sort arrow and two or more dots.

There are more things you can do, such as minimizing panes and setting views to be pop-up “Fast Views”,

but that’s probably enough to get you started.

Getting help (more digression)

You can press the F1 key (or Shift+F1 on Linux) at any time to get help about the current view. You can

use Help > Help Contents > ARM DS-5 Documentation to view the documentation. You can access

cheat sheets for various tasks using Help > Cheat Sheets > ARM …, for example importing the example

projects. (But we won't be following those cheat sheets here.)

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