Debugging technology-orisun-blog

Debugging technology-orisun-blog

35 degrees in China

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Debugging technology

GDB

(GDB) r 65536 Hello running with Parameters

You can use PS | grep ××× or pstree to view the process ID.

Attach <pid> mountedProgramDebugging the running program

Detach <pid> unmount

Watch <expression> once the expression value changes, stop the program immediately.

View during GDB debuggingSource code

List

List <line-number>

List <function>

For single-step debugging, you can use N (EXT) and S (TEP). Step is used to enter the function and next is not used.

Set the breakpoint B sum in the specified function

Set ARGs "ZCY" -- Specify runtime Parameters

Show ARGs -- view the set runtime Parameters

Shell Command -- run shell commands directly during debugging

Break row number or function name if condition expression -- Set breakpoint

Tbreak row number or function name if condition expression -- sets a temporary breakpoint and is automatically deleted upon arrival

Delete breakpoint number -- delete a specified breakpoint. Its breakpoint number is the first column in "info B. If the default breakpoint number is used, all breakpoints are deleted.

Disable breakpoint number -- stop a specified breakpoint and use "info B" to view the breakpoint. Similar to delete, a breakpoint number is saved to stop all breakpoints.

Enable breakpoint number -- specifies the breakpoint to be activated, that is, the breakpoint to be disabled by disable is activated.

Condition breakpoint number if <condition expression> -- modify the condition of the corresponding breakpoint

C -- continue to execute the function until the function ends or a new breakpoint occurs.

Ignore breakpoint number <num> during program execution, the corresponding breakpoint num is ignored.

Wahtis P viewing variable types

Backtrace (or BT) to view stack information

When a function is called, the address, parameters, and local variables of the function are pushed into the stack.

Each function corresponds to a frame. When a function is called, the frame has many layers.

Frame 0

Up move frame up

Move down Frame

Info register view register information

Multi-process debugging

(GDB) Continue debugging the parent process after follow-fork-mode parent fork. The child process is not affected.

(GDB) subprocesses are debugged after follow-fork-mode child fork. Parent and Child processes are not affected.

(GDB) set detach-on-fork on disconnect and debug the process specified by follow-fork-Mode

(GDB) set detach-on-fork off GDB will continue to control sub-processes and parent processes. The process specified by follow-fork-mode will be debugged, And the other process will be in the suspend state.

Multi-thread debugging

Info threads displays the summary of all threads

Thread <threadno> sets the process whose process number is threadno to the current process

Break <linenumber> thread <threadno> specifies the line number and process number when a breakpoint is set.

Remote debugging

Gdbserver + GDB runs on the host, and gdbserver runs on the target environment

Download and decompress the gdb package

CD gdb-6.6

./Configure -- target = arm-Linux

Make

Sudo make install

This is to compile the gdb program for the host.

Cd gdb/gdbserver/

./Configure -- target = arm-Linux -- Host = arm-Linux

Make cc =/opt/embedsky/4.3.3/bin/ARM-Linux-gcc

Sudo make install

Download the generated gdbserver TO THE DEVELOPMENT BOARD

Use the arm-Linux-gcc-ggdb programming program test. C on the PC to download test to the Development Board, and keep test on the PC.

GDB and gdbserver can communicate with each other through TCP (in the format of Host: port), UDP (in the format of UDP: Host: port), or serial port.

Take TCP as an example:
On the Development Board, # gdbserver 192.168.0.100: 5678./overflow 192.168.0.100 is the Host IP address.

On the host, $ arm-Linux-GDB./Overflow

(GDB) target remote 192.168.0.102: 5678 192.168.0.102 is the IP address of the Development Board.

For more information, see http://blog.csdn.net/shawnrong/archive/2007/08/16/1745998.aspx

And http://blog.ednchina.com/baifanshuishou/1968826/message.aspx

Graphical debugging

Use DDD (data display debugger)

Author: orisun (35 degrees in China) http://www.cnblogs.com/zhangchaoyang