[Avila] gdb and gdbserver on 2348/0.6

[Tim Harvey]

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I've been able to remote debug with the combination but I recall I had to build them myself.  The ones that came with snapgear did not work for me.  Give that a shot!

Tim

gw at lunstad.com wrote: Has anyone had luck getting gdb/gdbserver working on the Avila platform? I
am not able to set breakpoints or step through the code properly. What I
can do is start a program in gdb, load some source and run the whole
program to completion.

Here is an example in a simple hello program.

1. Compiled the program like this:
 arm-linux-gcc -ggdb -mbig-endian hello.c

2. Ran gdb that was built in the tree:
avila/snapgear> ./user/gdb/host/gdb/gdb
GNU gdb 6.3
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for details.
This GDB was configured as "--host=i686-pc-linux-gnu --target=arm-linux".

3. Targeted the machine and connected, but got a weird message:
(gdb) target remote 192.168.22.50:2345
Remote debugging using 192.168.22.50:2345
Cannot access memory at address 0x801b0040

4. Loaded the symbols. A very simple program...
(gdb) sym ~/
/a.out
Reading symbols from /home/ajl/
/a.out...done.
(gdb) list
3       void count(int i)
4       {
5           printf("And a %d\n", i);
6       }
7
8       main(int argc, char argv[][])
9       {
10          int i;
11
12          printf("Hello world.\n");

5. Cannot step
(gdb) step
Cannot access memory at address 0x801b0040
6. Set breakpoint OK?
(gdb) break count
Breakpoint 1 at 0x836c: file hello.c, line 5.

7. Continued and hit SIGSEGV, but did not seem to be at function.
(gdb) c
Continuing.

Program received signal SIGSEGV, Segmentation fault.
Cannot access memory at address 0xa4000640
(gdb) list
13
14          for(i=0;i<10; i++) {
15              count(i);
16          }
17      }

8. Still can't step, but at different address?
(gdb) step
Cannot access memory at address 0xa4000640

9. Seems to know where main is, kind of:
(gdb) list main
4       {
5           printf("And a %d\n", i);
6       }
7
8       main(int argc, char argv[][])
9       {
10          int i;
11
12          printf("Hello world.\n");
13

10. Not sure if the regs look right. Still new to IXP425.
(gdb) info reg
r0             0x0      0
r1             0x0      0
r2             0x0      0
r3             0x6a89fcbe       1787428030
r4             0x0      0
r5             0x548efcbe       1418656958
r6             0x30820000       813826048
r7             0x8b00040        145752128
r8             0x1000000        16777216
r9             0x1000000        16777216
r10            0x701240 7344704
r11            0xdc8dfcbe       -594674498
r12            0x0      0
sp             0x2488fcbe       612957374
lr             0x0      0
pc             0xa4000640       -1543502272
fps            0x0      0
cpsr           0x10000060       268435552

11. Can't disassemble
(gdb) disass
No function contains program counter for selected frame.

(gdb)

Any thoughts or advice would be greatly appreciated. As I said, the
program (a.out) runs fine, but I can not debug it. Here is the full
source:

> cat hello.c
#include 

void count(int i)
{
    printf("And a %d\n", i);
}

main(int argc, char argv[][])
{
    int i;

    printf("Hello world.\n");

    for(i=0;i<10; i++) {
        count(i);
    }
}

Andrew

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