Re: Howto single step from beginning

[Paul Blacquiere <blacq at slingshot dot co dot nz>]

Hi,

> Sorry, but I don't understand what you mean.  You'd have to show a
> complete example.

This is the beginning of the prog to debug (ARM) :

00008090 <_start>:
    8090:       e3a0b000        mov     fp, #0  ; 0x0
    8094:       e3a0e000        mov     lr, #0  ; 0x0
    8098:       e49d1004        ldr     r1, [sp], #4
    809c:       e1a0200d        mov     r2, sp
    80a0:       e52d2004        str     r2, [sp, #-4]!
    80a4:       e52d0004        str     r0, [sp, #-4]!


start gdb:
$> gdb test

attempt to run:
--------------------------------
(gdb) run
Starting program: /home/blacq/src/bin/test

Program received signal SIGILL, Illegal instruction.
0x00008094 in _start ()
(gdb)
--------------------------------
(by now you are muttering, not this old chestnut again...)

So I would like to investigate the CPSR etc before and after, as the command
(mov     lr, #0  ; 0x0) looks good to me.

trying the following:
--------------------------------
(gdb) break _start
Breakpoint 1 at 0x8090
(gdb) run
Starting program: /home/blacq/src/bin/test

Program received signal SIGILL, Illegal instruction.
0x00008094 in _start ()
(gdb)
--------------------------------

So at this point I am stumped.