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Date: Mon, 19 Apr 2010 06:06:25 -0700
From: Nathan Froyd <froydnj@codesourcery.com>
Subject: Re: [Qemu-devel] Inserting Memory Watch points
Message-ID: <20100419130625.GC18198@codesourcery.com>
References: <COL102-W729833CD17039A04D3ABD970B0@phx.gbl>
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To: Taimoor Mirza <mooni_mirza@hotmail.com>
Cc: qemu-devel@nongnu.org

On Mon, Apr 19, 2010 at 12:11:46PM +0600, Taimoor Mirza wrote:
> Program received signal SIGSEGV, Segmentation fault.
> [Switching to Thread -1208740160 (LWP 1912)]
> gdb_set_stop_cpu (env=0x9ef36a0) at /usr/QEMU_Learning/QEMU_Src/qemu-0.12.3/gdbstub.c:2114
> 2114        gdbserver_state->c_cpu = env;
> (gdb) p env
> $1 = (struct CPUARMState *) 0x9ef36a0
> (gdb) p gdbserver_state->c_cpu
> Cannot access memory at address 0x0
> 
> Can anybody tell me whats wrong with this?

gdbserver_state is NULL.  You need to start QEMU with the -gdb switch
and connect to it via GDB for cpu_watchpoint_insert to work.

-Nathan