From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mail-yw0-f49.google.com ([209.85.213.49]) by merlin.infradead.org with esmtps (Exim 4.76 #1 (Red Hat Linux)) id 1SWYKe-00053G-Ri for barebox@lists.infradead.org; Mon, 21 May 2012 19:31:54 +0000 Received: by yhjj52 with SMTP id j52so5407871yhj.36 for ; Mon, 21 May 2012 12:31:51 -0700 (PDT) MIME-Version: 1.0 In-Reply-To: <20120518094110.GS30400@pengutronix.de> References: <20120518094110.GS30400@pengutronix.de> Date: Mon, 21 May 2012 21:31:51 +0200 Message-ID: From: Carlo Caione List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: barebox-bounces@lists.infradead.org Errors-To: barebox-bounces+u.kleine-koenig=pengutronix.de@lists.infradead.org Subject: Re: SVC32 and SP To: Sascha Hauer Cc: barebox@lists.infradead.org On Fri, May 18, 2012 at 11:41 AM, Sascha Hauer wrote: > On Fri, May 18, 2012 at 12:06:00AM +0200, Carlo Caione wrote: >> Hi, >> I was debugging the problem with barebox and qemu-linaro as I >> described in a previous post. >> This is what I have discovered. >> >> The problem is in the strlen function that seems to get corrupted >> runtime during barebox initialization. The problem seems related to >> the switch to SVC32 mode together with the __mmu_cache_flush >> implementation. >> Before setting the cpu to SVC32 mode, the Stack Pointer is correctly >> set to 0x4020fcb0, but, immediately after the writing in the cpsr >> register (__asm__ __volatile__("msr cpsr, %0" : : "r"(r));) the Stack >> Pointer (now R13_SVC) is in 0x40205cb0 that is in the middle of the >> .text section (and precisely in the middle of the strlen routine). >> The problem is that in the __mmu_cache_flush disassembly I have a huge >> push {r0, r1, r2, r3, r4, r5, r6, r7, r9, r10, r11} that overwrites >> the strlen function and corrupts the code. > > Can you try and remove the call to __mmu_cache_flush in start.c? Everything is fine if I comment out __mmu_cache_flush() _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox