Re: Howto single step from beginning

Paul Blacquiere
2006-02-02T02:52:58Z

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.