About the breakpoint for arm-linux(ARM920T)

About the breakpoint for arm-linux(ARM920T)

[たなか みほ]

 Hi all,

 I'am trying to remote debugging with gdbserver.
 Target is arm-linux for ARM920T.

 Using environment is the following.

+------------------+                    +--------------------+
|      HostPC      |       TCP/IP       |  target board      |
| (i386 RedHat7.2) |------------------- | (ARM920T arm-linux)|
|       gdb        |                    |    gdbserver       |
+------------------+                    +--------------------+

 For remote debugging, I tried to compile gdb and gdbserver(gdb-5.2) 
following the README and it was success.
 Then I started to remote debugging .
 The gdbserver attached debugging program and stopped at first instruction 
of debugging program.

 But when I set a breakpoint and executed the debugging program, SIGILL 
occurred in the address where I set a breakpoint.
 So checked the instruction in that address.
 There are "0xe7 0xff 0xde 0xfe".
 
 The instruction "0xe7 0xff 0xde 0xfe" are the breakpoint instruction for 
arm-linux?

and...

 in gdb/gdb/arm-linux-tdep.c
 line 38

/* Under ARM GNU/Linux the traditional way of performing a breakpoint
   is to execute a particular software interrupt, rather than use a
   particular undefined instruction to provoke a trap.  Upon exection
   of the software interrupt the kernel stops the inferior with a
   SIGTRAP, and wakes the debugger.  Since ARM GNU/Linux is little
   endian, and doesn't support Thumb at the moment we only override
   the ARM little-endian breakpoint.  */

static const char arm_linux_arm_le_breakpoint[] = {0x01,0x00,0x9f,0xef};
 
-----------------
 How to use this "arm_linux_arm_le_breakpoint" ?
 I think.. if I can use this breakpoint instruction ,the debugging program 
will stop at breakpoint which I set.
 

 Please teach me.
 





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Re: About the breakpoint for arm-linux(ARM920T)

[Daniel Jacobowitz]

On Thu, Jul 11, 2002 at 02:13:35PM +0900, ?$B$?$J$+ ?$B$_$[ wrote:
> 
> Hi all,
> 
> I'am trying to remote debugging with gdbserver.
> Target is arm-linux for ARM920T.
> 
> Using environment is the following.
> 
> +------------------+                    +--------------------+
> |      HostPC      |       TCP/IP       |  target board      |
> | (i386 RedHat7.2) |------------------- | (ARM920T arm-linux)|
> |       gdb        |                    |    gdbserver       |
> +------------------+                    +--------------------+
> 
> For remote debugging, I tried to compile gdb and gdbserver(gdb-5.2) 
> following the README and it was success.
> Then I started to remote debugging .
> The gdbserver attached debugging program and stopped at first instruction 
> of debugging program.
> 
> But when I set a breakpoint and executed the debugging program, SIGILL 
> occurred in the address where I set a breakpoint.
> So checked the instruction in that address.
> There are "0xe7 0xff 0xde 0xfe".
> 
> The instruction "0xe7 0xff 0xde 0xfe" are the breakpoint instruction for 
> arm-linux?

No, that's the breakpoint instruction for arm-elf, which is different.

How did you configure GDB?

-- 
Daniel Jacobowitz                           Carnegie Mellon University
MontaVista Software                         Debian GNU/Linux Developer

Re: About the breakpoint for arm-linux(ARM920T)

[Tanaka Miho]

Hello.
Yesterday,I missed writing.
Sorry.

> > The instruction "0xe7 0xff 0xde 0xfe" are the breakpoint instruction 
for
> > arm-linux?
>
>No, that's the breakpoint instruction for arm-elf, which is different.
>
>How did you configure GDB?
>
>--
>Daniel Jacobowitz                           Carnegie Mellon University
>MontaVista Software                         Debian GNU/Linux Developer


Correctly,
I did configure as follows...


-- GDB for host ---

1. $ tar zxvf gdb-5.2.tar.gz
2. $ mkdir /home/tanaka/work
3. $ cd /home/tanaka/work
4. $ ./../gdb-5.2/configure --target=arm-linux --host=i586-linux 
--prefix=/tools
5. $ make
6. $ su
7. # make install


-- GDBserver ---

1. $ export CC=arm-linux-gcc     <--- cross compiler name
2. $ mkdir /home/tanaka/work_server
3. $ cd /home/tanaka/work_server
4. $ ./../gdb-5.2/gdb/gdbserver/configure arm-linux
5. $ make

This process is not correct?






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Re: About the breakpoint for arm-linux(ARM920T)

[TANAKA MIHO]

Hello.
Thanks for your reply.


>From: Daniel Jacobowitz <drow@mvista.com>
>To: "?$B$?$J$+ ?$B$_$[" <kamakuran@hotmail.com>
>CC: gdb@sources.redhat.com
>Subject: Re: About the breakpoint for arm-linux(ARM920T)
>Date: Thu, 11 Jul 2002 08:52:53 -0400
>
>On Thu, Jul 11, 2002 at 02:13:35PM +0900, ?$B$?$J$+ ?$B$_$[ wrote:
> >
> > Hi all,
> >
> > I'am trying to remote debugging with gdbserver.
> > Target is arm-linux for ARM920T.
> >
> > Using environment is the following.
> >
> > +------------------+                    +--------------------+
> > |      HostPC      |       TCP/IP       |  target board      |
> > | (i386 RedHat7.2) |------------------- | (ARM920T arm-linux)|
> > |       gdb        |                    |    gdbserver       |
> > +------------------+                    +--------------------+
> >
> > For remote debugging, I tried to compile gdb and gdbserver(gdb-5.2)
> > following the README and it was success.
> > Then I started to remote debugging .
> > The gdbserver attached debugging program and stopped at first 
instruction
> > of debugging program.
> >
> > But when I set a breakpoint and executed the debugging program, SIGILL
> > occurred in the address where I set a breakpoint.
> > So checked the instruction in that address.
> > There are "0xe7 0xff 0xde 0xfe".
> >
> > The instruction "0xe7 0xff 0xde 0xfe" are the breakpoint instruction 
for
> > arm-linux?
>
>No, that's the breakpoint instruction for arm-elf, which is different.
>
>How did you configure GDB?
>
>--
>Daniel Jacobowitz                           Carnegie Mellon University
>MontaVista Software                         Debian GNU/Linux Developer


I did configure as follows...


-- GDB for host ---

1. $ tar zxvf gdb-5.2.tar.gz
2. $ mkdir /home/tanaka/work
3. $ cd /home/tanaka/work
4. $ ./../gdb-5.2/configure --target=arm-linux --host=i586-linux 
--prefix=/tools
5. $ make
6. $ su
7. # make install


-- GDBserver ---

1. $ mkdir /home/tanaka/work_server
2. $ cd /home/tanaka/work_server
3. $ ./../gdb-5.2/gdb/gdbserver/configure arm-linux
4. $ make
5. $ su
6. # make install


I missed doing configure?



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