Monday, April 25, 2011

Switching to assembly in gdb

Is there is any way to switch to assembly when debugging a C or C++ program in gdb ? (Given that all source files and their corresponding assembly files are available)

From stackoverflow
  • There is a way to disassemble a function or a certain section of code, is that what you are after?

    The command to do so would be disassemble <function name> or a memory location.

    Is this what you are referring to?

    (gdb) help disassemble
    Disassemble a specified section of memory.
    Default is the function surrounding the pc of the selected frame.
    With a single argument, the function surrounding that address is dumped.
    Two arguments are taken as a range of memory to dump.
    
    Ben : actually yes .. thanks
  • Using the disas command will probably do what you want.

    According to the internal help, the disas command does the following:

    Disassemble a specified section of memory.
    Default is the function surrounding the pc of the selected frame.
    With a single argument, the function surrounding that address is dumped.
    Two arguments are taken as a range of memory to dump.
    
  • In the new gdb version 7.0, the "disassemble" command can take a new argument "/m" which makes it emit mixed source and disassembly.

  • You can switch to asm layout in gdb:

    (gdb) layout asm
    

    See here for more information.

0 comments:

Post a Comment