Re: [RFC] gdb.server testcases (resend)

[Daniel Jacobowitz <drow at false dot org>]

On Thu, May 19, 2005 at 04:07:06AM -0400, Wu Zhou wrote:
> 2. 64-bits gdbserver with 32-bits debuggee
> 
> without Daniel's patch, the 64-bits gdbserver on my power4 box also
> report "reading register I/O error" at register 1. After applying 
> Daniel's patch, gdbserver could start the 32-bits debuggee and begin
> to wait for the remote gdb's connection. 
> 
> On the host side, my gdb session is somewhat the same as yours. It
> seems that gdb at the host side expects 32-bits register, something
> like:
> 
>  T0501:ffffe6b0;40:40010470;
> 
> but the remote gdbserver sends back 64-bits value:
> 
>  T0501:00000000ffffe6b0;40:0000000040010470;
> 
> So it report "Remote register badly formatted" error. 

Yes, this will not work.  The correct way to handle this is to wait
until I have implemented the available target features proposal I've
posted on gdb@, and then I can make gdbserver inform GDB that 64-bit
registers are available so that it will expect them.

This will require some surgery in GDB, I'm sure.  The way MIPS
implements this is not very reliable.

> Program received signal SIGFPE, Arithmetic exception.
> 0x000000800013fd64 in .vfprintf () from /lib64/tls/libc.so.6
> (gdb) 
> 

I have no idea what causes this one, sorry.


-- 
Daniel Jacobowitz
CodeSourcery, LLC