From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 104818 invoked by alias); 8 Nov 2016 13:37:22 -0000 Mailing-List: contact gcc-patches-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Id: List-Archive: List-Post: List-Help: Sender: gcc-patches-owner@gcc.gnu.org Received: (qmail 104763 invoked by uid 89); 8 Nov 2016 13:37:21 -0000 Authentication-Results: sourceware.org; auth=none X-Virus-Found: No X-Spam-SWARE-Status: No, score=-3.8 required=5.0 tests=BAYES_00,KAM_LAZY_DOMAIN_SECURITY,RP_MATCHES_RCVD autolearn=ham version=3.3.2 spammy=sk:frame_p, thumb-1, thumb1, Thumb1 X-HELO: foss.arm.com Received: from foss.arm.com (HELO foss.arm.com) (217.140.101.70) by sourceware.org (qpsmtpd/0.93/v0.84-503-g423c35a) with ESMTP; Tue, 08 Nov 2016 13:37:14 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 9C30ECF6; Tue, 8 Nov 2016 05:37:12 -0800 (PST) Received: from [10.2.206.52] (usa-sjc-imap-foss1.foss.arm.com [10.72.51.249]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id DD3343F25D; Tue, 8 Nov 2016 05:37:11 -0800 (PST) Subject: Re: [PATCH, GCC/ARM, ping] Fix PR77904: callee-saved register trashed when clobbering sp To: Kyrill Tkachov , Ramana Radhakrishnan , Richard Earnshaw , "gcc-patches@gcc.gnu.org" References: From: Thomas Preudhomme Message-ID: <8361d384-28ff-6f29-a33a-83bfcd25b043@foss.arm.com> Date: Tue, 08 Nov 2016 13:37:00 -0000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.2.0 MIME-Version: 1.0 In-Reply-To: Content-Type: multipart/mixed; boundary="------------EC1305B2EE05273D4EDFD32E" X-IsSubscribed: yes X-SW-Source: 2016-11/txt/msg00738.txt.bz2 This is a multi-part message in MIME format. --------------EC1305B2EE05273D4EDFD32E Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Content-length: 1026 Ping? Best regards, Thomas On 03/11/16 16:52, Thomas Preudhomme wrote: > Hi, > > When using a callee-saved register to save the frame pointer the Thumb-1 > prologue fails to save the callee-saved register before that. For ARM and > Thumb-2 targets the frame pointer is handled as a special case but nothing is > done for Thumb-1 targets. This patch adds the same logic for Thumb-1 targets. > > ChangeLog entries are as follow: > > *** gcc/ChangeLog *** > > 2016-11-02 Thomas Preud'homme > > PR target/77904 > * config/arm/arm.c (thumb1_compute_save_reg_mask): mark frame pointer > in save register mask if it is needed. > > > *** gcc/testsuite/ChangeLog *** > > 2016-11-02 Thomas Preud'homme > > PR target/77904 > * gcc.target/arm/pr77904.c: New test. > > > Testing: Testsuite shows no regression when run with arm-none-eabi GCC > cross-compiler for Cortex-M0 target. > > Is this ok for trunk? > > Best regards, > > Thomas --------------EC1305B2EE05273D4EDFD32E Content-Type: text/x-patch; name="fix_pr77904.patch" Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename="fix_pr77904.patch" Content-length: 1783 diff --git a/gcc/config/arm/arm.c b/gcc/config/arm/arm.c index dd8d5e5db8ca50daab648e58df290969aa794862..c7bf3320a3db5dfc4f33ae145ff2e5f239d6c0f9 100644 --- a/gcc/config/arm/arm.c +++ b/gcc/config/arm/arm.c @@ -19495,6 +19495,10 @@ thumb1_compute_save_reg_mask (void) if (df_regs_ever_live_p (reg) && callee_saved_reg_p (reg)) mask |= 1 << reg; + /* Handle the frame pointer as a special case. */ + if (frame_pointer_needed) + mask |= 1 << HARD_FRAME_POINTER_REGNUM; + if (flag_pic && !TARGET_SINGLE_PIC_BASE && arm_pic_register != INVALID_REGNUM diff --git a/gcc/testsuite/gcc.target/arm/pr77904.c b/gcc/testsuite/gcc.target/arm/pr77904.c new file mode 100644 index 0000000000000000000000000000000000000000..76728c07e73350ce44160cabff3dd2fa7a6ef021 --- /dev/null +++ b/gcc/testsuite/gcc.target/arm/pr77904.c @@ -0,0 +1,45 @@ +/* { dg-do run } */ +/* { dg-options "-O2" } */ + +__attribute__ ((noinline, noclone)) void +clobber_sp (void) +{ + __asm volatile ("" : : : "sp"); +} + +int +main (void) +{ + int ret; + + __asm volatile ("mov\tr4, #0xf4\n\t" + "mov\tr5, #0xf5\n\t" + "mov\tr6, #0xf6\n\t" + "mov\tr7, #0xf7\n\t" + "mov\tr0, #0xf8\n\t" + "mov\tr8, r0\n\t" + "mov\tr0, #0xfa\n\t" + "mov\tr10, r0" + : : : "r0", "r4", "r5", "r6", "r7", "r8", "r10"); + clobber_sp (); + + __asm volatile ("cmp\tr4, #0xf4\n\t" + "bne\tfail\n\t" + "cmp\tr5, #0xf5\n\t" + "bne\tfail\n\t" + "cmp\tr6, #0xf6\n\t" + "bne\tfail\n\t" + "cmp\tr7, #0xf7\n\t" + "bne\tfail\n\t" + "mov\tr0, r8\n\t" + "cmp\tr0, #0xf8\n\t" + "bne\tfail\n\t" + "mov\tr0, r10\n\t" + "cmp\tr0, #0xfa\n\t" + "bne\tfail\n\t" + "mov\t%0, #1\n" + "fail:\n\t" + "sub\tr0, #1" + : "=r" (ret) : :); + return ret; +} --------------EC1305B2EE05273D4EDFD32E--