Debug using GDB in uClinux

Environment: Blackfin uClinux (Version: buildroot-2012R1-RC6-BF60X)

Linux host: Ubuntu 10.04.4

You can debug through the serial port or network. The following example uses network debugging as an example.

1. Compile the application on the Linux host: bfin-uClinux-gcc-g-O0-o a. out test. c

-G: Add debugging information to the executable file to make GDB work normally;

-O0: Set the optimization level to 0 for debugging.

2. copy the compiled Executable File A. Out to the root directory of uClinux on the Super Terminal:

Ftpget-u Joey-P 123456 192.168.1.159 A. Out/mnt/HGFS/uClinux-code/abc3000_src/a. Out

Grant a. out executable permissions:

Chmod A + x a. Out

Start gdbserver in uClinux:

Gdbserver localhost: 3456 A. Out (3456 is a port. If it does not conflict with other applications, you can change it to any port)

3. Run the following command on the Linux host: bfin-uClinux-gdb a. Out. GDB (A. Out. GDB is generated during compilation)

After GDB runs on the host, run the following command to connect to the target system: uClinux:

Target remote 192.168.1.122: 3456 (192.168.1.122 is the IP address of uClinux)

In this step, you can perform debugging:

Bytes --------------------------------------------------------------------------------------------------------

The following table lists common gdb commands:

Command	Effect
Start and Stop
Quit	Exit GDB
Run	Run the program (you can run command line parameters later)
Kill	Stop program
Breakpoint
Break sum	Set a breakpoint at the entrance of the sum function
Break * 0x80483c3	Set a breakpoint at address 0x80483c3
Delete 1	Deletes 1st breakpoints.
Delete	Delete all breakpoints
Run
Stepi	Execute a command (Statement by statement, which will enter the function)
Stepi n	Execute n commands (Statement by Statement)
Nexti	Similar to stepi (process-by-process, no function entry)
Continue	Continue execution
Finish	Returns the result of running to the current function.
Check Code
Disas	Disassemble the current function
Disas sum	Disassembly function Sum
Disas 0x80483b7	Code near the disassembly address 0x80483b7
Disas 0x80483b7 0x80483c7	Decompiling code between two addresses
Print/x $ PC	Print the program counter in hexadecimal format
List	List source code
List n	List source code near line N
Check Data
Print $ R0	Print the R0 value in decimal format.
Print/x $ R0	Print the R0 value in hexadecimal format
Print/T $ R0	Print the R0 value in binary format.
Print 0x100	Print 0x100 in decimal format
Print/x 1024	Print the hexadecimal format of 1024
Print/T 1024	Print the binary format of 1024
Print/X ($ PC + 8)	Print register PC content in hexadecimal format + 8
Print * (int *) 0xbffff890	Print the integer in 0xbfffff890
Print * (int *) ($ PC + 8)	Print the integer in the address % PC + 8
Useful information
Info Frame	Current stack shard Information
Info registers	Information of all registers
Help	Obtains information about GDB.

 

For more details, see: http://docs.blackfin.uclinux.org/doku.php? Id = debuggers & S [] = GDB