Re: [openrisc] Gdb Debuginfo for variables in the data-segment

[Gili Gamliel <gilig@flextronics.co.il>]

Andreas Rasmusson wrote:

> Hi!
>
> I'm trying to debug a very simple program using
> gdb over the jtag-port. It works mostly fine, but
> the variables in the data-segment seem to have no
> debug info, whereas static variables and variables
> on the stack have correct debug info.
>
> Below is my simple test-program and link-script.
> and a sample gdb-debugging-session. As you see
> gdb has no info about the variable 'a' (the adress
> to it can be retrieved using _a, though, but then
> all type-info is lost).  I've tried to add more stuff
> to the link-script but winthout sucess.
> Does anyone know if its possible to get this info
> for variables in the data-segment?
>
> ----- c-file ----------------
>
> int a[] = {1,2};
> static int b[] = {3,4};
> void start() {
>  int c[] = {5,6};
> }
>
> ----- link-script ------------
>
> MEMORY
>        {
>        ram : ORIGIN = 0x08110000, LENGTH = 0x01000000
>        }
>
> SECTIONS
> {
>        .text : { *(.text) } > ram
>        .data : { *(.data) } > ram
>        .rodata : { *(.rodata) } > ram
>
>        . = ALIGN( 0x4 );
>        __bss_start = .;
>
>        .bss : { *(.bss) } > ram
>
>        . = ALIGN( 0x4 );
>        _end = .; /* needed by newlib */
> }
>
> ----- sample gdbsession -------------
>
>
> (gdb) file simple2.or32
> A program is being debugged already.  Kill it? (y or n) y
>
> Load new symbol table from "simple2.or32"? (y or n) y
>
> Reading symbols from simple2.or32...done.
> (gdb) target jtag jtag://localhost:9999
> Remote or1k debugging using jtag://localhost:9999
> 0x0 in ?? ()
> (gdb) load
> Loading section .text, size 0x28 lma 0x8110000
> Loading section .data, size 0x10 lma 0x8110028
> Start address 0x8110000 , load size 56
> Transfer rate: 448 bits in <1 sec, 28 bytes/write.
> (gdb) p a
> Address of symbol "a" is unknown.
> (gdb) p b
> $2 = {3, 4}
> (gdb) p (&_a)
> $5 = (<data variable, no debug info> *) 0x8110028
> (gdb) p *(int*)(&_a)
> $7 = 1
> (gdb) p *(int*)(&_a+1)
> $8 = 2
> (gdb)
>
>
> -- 
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Maybe its because you compile your program with '-g -O' ,Then  the 
optimiser is rearranging
your code , if you define a variable, but never use it , gdb can't sees 
that variable because the
compiler optimizes it out of existence, try to compile without optimize.

Gili.


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