Download PrPMC8005E Processor PMC Module Installation and Use

5 PPCBug
Using PPCBug
PPCBug is command-driven; it performs its various operations in response to commands that
you enter at the keyboard. When the PPC7-Bug prompt appears on the screen, the debugger
is ready to accept debugger commands. When the PPC7-Diag prompt appears on the screen,
the debugger is ready to accept diagnostics commands. To switch from one mode to the other,
enter SD.
What you enter is stored in an internal buffer. Execution begins only after you press the Return
or Enter key. This allows you to correct entry errors, if necessary, with the control characters
described in the PPCBug Firmware Package User’s Manual.
After the debugger executes the command, the prompt reappears. However, if the command
causes execution of user target code (for example GO) then control may or may not return to
the debugger, depending on what the user program does. For example, if a breakpoint has been
specified, control returns to the debugger when the breakpoint is encountered during execution
of the user program. Alternately, the user program could return to the debugger by means of
the System Call Handler routine RETURN. For more about this, refer to the GD, GO, and GT
command descriptions in the PPCBug Firmware Package User’s Manual.
A debugger command is made up of the following parts:
❏
The command name, either uppercase or lowercase (for example, MD or md).
❏
Any required arguments, as specified by command.
❏
At least one space before the first argument. Precede all other arguments with either
a space or comma.
❏
One or more options. Precede an option or a string of options with a semicolon (;). If
no option is entered, the command’s default option conditions are used.
Debugger Commands
The individual debugger commands are listed in the following table. The commands are
described in detail in the PPCBug Firmware Package User’s Manual.
Note
You can list all the available debugger commands by entering the
Help (HE) command alone. You can view the syntax for a particular
command by entering HE and the command mnemonic, as listed
below.
Table 5-1. Debugger Commands
42
Command
Description
AS
One Line Assembler
BC
Block of Memory Compare
BF
Block of Memory Fill
BI
Block of Memory Initialize
BM
Block of Memory Move
PrPMC8005E Processor PMC Module Installation and Use (6806800A42B)