c_debug

MIPS处理器的bootloader,龙芯就是用的修改过的PMON2

The debug Command
debug

The debug command initiates the Monitor's
gdb/dbx mode.

Format

The format for the debug command is:

debug [-svV] [-c args] 

where:

-s	does not set client stack pointer.

-v	shows communication errors.

-V	sets the verbose option.

-c args	indicates that the argument or arguments args are to be 
passed to the client program.

Functional Description

The debug command causes the Monitor to enter gdb/dbx mode. It is
intended to be used with either the GNU's gdb or MIPS' dbx source-level
debugger. The -V option selects verbose mode. In verbose mode, each of
the messages sent to and received from dbx are displayed on the
terminal screen. It is not possible to leave verbose mode without
leaving dbx mode and reentering dbx mode without the -V option. By
default, the Monitor displays in terse mode.

Examples illustrating the use of the debug command with MIPS' dbx follow. 

% cat /etc/remote.pdbx		Display port information on host port1.
port1:dv=/dev/tty1:br#9600:

% cat ~/.dbxinit 		Display setup for dbx.
set $pdbxport = "port1"
set $usesockets=0
set $manual_load = 1

PMON set hostport tty1		Specify protocol and port for target.
PMON set dlproto EtxAck 
PMON set dlecho off 
PMON load 			Prepare for download, and start.

% edown /dev/tty1 < test1.rec
% dbx -prom test1		Invoke dbx.

(dbx) stop in main		Optionally set breakpoint at main.
(dbx) run			Prepare for execution.

PMON debug			Begin executing.

See Also
set
command for the setup of the environment variables.