Motorola MVME2700 Series Manuel d'utilisateur télécharger pdf (Page 63)

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2Using the Debugger

Entering Commands

The debugger is command-driven and performs its various operations in

response to commands that you enter at the keyboard. When the PPCx-

Bug> prompt appears on the screen, the debugger is ready to accept

commands.

What you enter is stored in an internal buffer. Execution begins only after

you press the Return key, allowing you to correct entry errors, if necessary,

using the control characters (refer to Control Characters on page 2-6).

After the debugger executes the command, the prompt reappears.

However, if the command causes execution of target code (for example

GO) then control may or may not return to the debugger, depending on

what the program does. For example, if a breakpoint has been specified,

then control returns to the debugger when the breakpoint is encountered

during execution of the user program. For more about this, refer to the GD,

GO, and GT command descriptions in Chapter 3, Debugger Commands.

Alternately, the user program could return to the debugger by means of the

System Call Handler routine .RETURN (refer to Chapter 5, System Calls).

Command Syntax

A debugger command is made up of the following parts:

❏ The command name

❏ Any required arguments, delineated with either a space or comma

(precede the first argument with a space)

❏ Any required options. Precede an option or a string of options with

a semi-colon (;). If no option is selected, the default options are

used.

Command entry is either uppercase or lowercase.

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Motorola MVME2700 Series Manuel d'utilisateur Page 63

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