From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from intranet.asianux.com (intranet.asianux.com [58.214.24.6]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by ozlabs.org (Postfix) with ESMTPS id DD51B2C011D for ; Fri, 26 Apr 2013 11:07:37 +1000 (EST) Message-ID: <5179D302.9060203@asianux.com> Date: Fri, 26 Apr 2013 09:06:10 +0800 From: Chen Gang MIME-Version: 1.0 To: Michael Neuling Subject: Re: [PATCH v2] PowerPC: kernel: compiling issue, make additional room in exception vector area References: <5177965D.9090406@linux.vnet.ibm.com> <20130424083142.GB26834@concordia> <51779941.8080403@linux.vnet.ibm.com> <30651.1366799858@ale.ozlabs.ibm.com> <1366807638.5911.2.camel@localhost> <5178816D.3000309@asianux.com> <5178ABA2.4030109@linux.vnet.ibm.com> <20130425062539.GA421@iris.ozlabs.ibm.com> <517918AB.4020508@asianux.com> <30269.1366931768@ale.ozlabs.ibm.com> In-Reply-To: <30269.1366931768@ale.ozlabs.ibm.com> Content-Type: text/plain; charset=GB2312 Cc: sfr@canb.auug.org.au, matt@ozlabs.org, linux-kernel@vger.kernel.org, Paul Mackerras , "Aneesh Kumar K.V" , Mike Qiu , linuxppc-dev@lists.ozlabs.org List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , On 2013Äê04ÔÂ26ÈÕ 07:16, Michael Neuling wrote: >> > diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S >> > index e789ee7..8997de2 100644 >> > --- a/arch/powerpc/kernel/exceptions-64s.S >> > +++ b/arch/powerpc/kernel/exceptions-64s.S >> > @@ -254,7 +254,11 @@ hardware_interrupt_hv: >> > STD_EXCEPTION_PSERIES(0x800, 0x800, fp_unavailable) >> > KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0x800) >> > >> > - MASKABLE_EXCEPTION_PSERIES(0x900, 0x900, decrementer) >> > + . = 0x900 >> > + .globl decrementer_pSeries >> > +decrementer_pSeries: >> > + b decrementer_pSeries_0 >> > + > Unfortunately you can't do this ether as we need to save the CFAR[1] > before it's overwritten by any branch. MASKABLE_EXCEPTION_PSERIES does > this. > Thanks for your checking. > CFAR is the Come From Register. It saves the location of the last > branch and is hence overwritten by any branch. > Do we process it just like others done (e.g. 0x300, 0xe00, 0xe20 ...) ? . = 0x900 .globl decrementer_pSeries decrementer_pSeries: HMT_MEDIUM_PPR_DISCARD SET_SCRATCH0(r13) b decrementer_pSeries_0 ... > Thanks for trying. > Not at all, before get fixed by other members, I should continue trying. -- Chen Gang Asianux Corporation