Query regarding assembly level debugging support

Daniel Jacobowitz drow@false.org
Thu Dec 2 14:24:00 GMT 2004

On Thu, Dec 02, 2004 at 02:48:15PM +0530, Tarun wrote:
> Hi All,
>     I am generating object file in Elf/Dwarf format. The prime target is
> to be able to debug the assembly code. That is we are able to step
> through the assembly code showing line numbers and relative addresses.
> The Dwarf (version 2.0) sections currently being included are 
> - debug_line
> - debug_abbrev
> - debug_info.
>      The linked out file is loaded without errors on GDB. When we run
> the respective out file on GDB, the control of debugger moves to label
> main in the assembly code ( Breakpoint 1, 0xa00200ec in main ()). When I
> try to move to next instruction using "nexti", the control moves to next
> address (Displaying: 0xa00200f0 in main ()). This continues till the
> last address is reached. Only the address increments within the assembly
> file are displayed and not the actual assembly source.
>       When I try to single step using "step", the message prompted is
> "Single stepping until exit from function main, which has no line number
> information". Whereas if I disassemble one of the addresses give above,
> entire assembly code which I am trying to debug is displayed.
>       Does this mean that GDB does not support debugging of the assembly
> code?

Are you saying that your source code is assembly, and your assembler
creates debug information for it?  This should work in GDB; make sure
that the .debug_line information is correct.

Daniel Jacobowitz

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