From Yu.Liu at freescale.com  Mon Jul 20 10:04:11 2009
From: Yu.Liu at freescale.com (Liu Yu-B13201)
Date: Mon, 20 Jul 2009 18:04:11 +0800
Subject: Gdb command watch issue hardware requests
Message-ID: <0A1FE637C2C7E148B9573BB60CC630E53A294D@zch01exm26.fsl.freescale.net>


Hi guys,

I am now developing in gdb remote mode.
I heard from someone that 'hbreak' and 'watch' should make the gdb frontend issue requests for hardware break/watchpoints.
(gdb >= 6.8 for hardware breakpoint over remote connections)

I checked that 'hbreak' indeed issue hardware breakpoint request but 'watch' still use software breakpoint and single step.
The toolchain version I used is gcc-4.3.74-eglibc-2.8.74-5 in which gdb version is 6.8.50.20080821-cvs. Does it not enough to support hardware assistant watch?

Does anyone know something about this?



From carlos at codesourcery.com  Mon Jul 20 18:49:08 2009
From: carlos at codesourcery.com (Carlos O'Donell)
Date: Mon, 20 Jul 2009 14:49:08 -0400
Subject: [power-gnu-discuss] Gdb command watch issue hardware requests
In-Reply-To: <0A1FE637C2C7E148B9573BB60CC630E53A294D@zch01exm26.fsl.freescale.net>
References: <0A1FE637C2C7E148B9573BB60CC630E53A294D@zch01exm26.fsl.freescale.net>
Message-ID: <4A64BC24.8090200@codesourcery.com>

Liu Yu-B13201 wrote:
> I am now developing in gdb remote mode.

What hardware are you using for debugging?

> I heard from someone that 'hbreak' and 'watch' should make the gdb frontend issue requests for hardware break/watchpoints.
> (gdb >= 6.8 for hardware breakpoint over remote connections)

That is correct, but only if the ICE and CPU support hardware 
break/watchpoints.

> I checked that 'hbreak' indeed issue hardware breakpoint request but 'watch' still use software breakpoint and single step.
> The toolchain version I used is gcc-4.3.74-eglibc-2.8.74-5 in which gdb version is 6.8.50.20080821-cvs. Does it not enough to support hardware assistant watch?

Does your hardware, both ICE and CPU, support hardware watchpoints?

Cheers,
Carlos.
-- 
Carlos O'Donell
CodeSourcery
carlos at codesourcery.com
(650) 331-3385 x716