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Mon, 27 Nov 2023 10:04:40 +0000 Date: Mon, 27 Nov 2023 10:04:27 +0000 From: Szabolcs Nagy To: , richard.sandiford@arm.com Subject: Re: [PATCH v2 3/7] aarch64: Add eh_return compile tests Message-ID: References: <60a89113beb96fc0183c8ebc2a0dc8d6feb91478.1699025214.git.szabolcs.nagy@arm.com> Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: X-ClientProxiedBy: LO4P265CA0247.GBRP265.PROD.OUTLOOK.COM (2603:10a6:600:350::6) To DB9PR08MB7179.eurprd08.prod.outlook.com (2603:10a6:10:2cc::19) MIME-Version: 1.0 X-MS-TrafficTypeDiagnostic: DB9PR08MB7179:EE_|AS4PR08MB7501:EE_|AMS0EPF000001B3:EE_|AM8PR08MB5796:EE_ X-MS-Office365-Filtering-Correlation-Id: 3ce4c858-292c-4344-cf29-08dbef304b41 x-checkrecipientrouted: true NoDisclaimer: true X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam-Untrusted: BCL:0; X-Microsoft-Antispam-Message-Info-Original: 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 X-Forefront-Antispam-Report-Untrusted: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:DB9PR08MB7179.eurprd08.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230031)(376002)(346002)(366004)(39860400002)(396003)(136003)(230922051799003)(64100799003)(1800799012)(451199024)(186009)(38100700002)(41300700001)(36756003)(2906002)(83380400001)(5660300002)(26005)(86362001)(2616005)(44832011)(66476007)(6512007)(6506007)(8936002)(6666004)(8676002)(478600001)(6486002)(6636002)(66556008)(66946007)(316002);DIR:OUT;SFP:1101; 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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 27 Nov 2023 10:04:50.2504 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 3ce4c858-292c-4344-cf29-08dbef304b41 X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d;Ip=[63.35.35.123];Helo=[64aa7808-outbound-1.mta.getcheckrecipient.com] X-MS-Exchange-CrossTenant-AuthSource: AMS0EPF000001B3.eurprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM8PR08MB5796 X-Spam-Status: No, score=-5.5 required=5.0 tests=BAYES_00,DKIM_SIGNED,DKIM_VALID,FORGED_SPF_HELO,KAM_DMARC_NONE,KAM_SHORT,RCVD_IN_DNSWL_NONE,RCVD_IN_MSPIKE_H2,SPF_HELO_PASS,SPF_NONE,TXREP,T_SCC_BODY_TEXT_LINE,UNPARSEABLE_RELAY autolearn=no autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org List-Id: The 11/26/2023 14:37, Richard Sandiford wrote: > Szabolcs Nagy writes: > > +++ b/gcc/testsuite/gcc.target/aarch64/eh_return-3.c > > @@ -0,0 +1,30 @@ > > +/* { dg-do compile } */ > > +/* { dg-options "-O2 -mbranch-protection=pac-ret+leaf" } */ > > Probably best to add -fno-schedule-insns -fno-schedule-insns2, so that the > instructions in the check-function-bodies are in a more predictable order. > > > +/* { dg-final { check-function-bodies "**" "" "" } } */ > > + > > +/* > > +**foo: > > +** hint 25 // paciasp > > +** stp x0, x1, .* > > +** stp x2, x3, .* > > +** cbz w2, .* > > +** mov x4, 0 > > +** ldp x2, x3, .* > > +** ldp x0, x1, .* > > +** cbz x4, .* > > +** add sp, sp, x5 > > +** br x6 > > +** hint 29 // autiasp > > +** ret > > +** mov x5, x0 > > +** mov x6, x1 > > +** mov x4, 1 > > +** b .* > > +*/ > > What's the significance of x3 here? It looks from the function definition > like it should be undefined. And what are the stps and ldps doing? x0,..,x3 are preserved registers for eh (EH_RETURN_DATA_REGNO). they are saved in the prologue and restored in the epilogue so they can pass arguments to eh, which i think is relevant to an eh_return test, although if the compiler knows they are not clobbered then it could eliminate the save/restore. > If those aren't an important part of the test, it might be better > to stub them out with "...", e.g.: i can do that. > /* > **foo: > ** hint 25 // paciasp > ** ... > ** cbz w2, .* > ** mov x4, 0 > ** ... > ** cbz x4, .* > ** add sp, sp, x5 > ** br x6 > ** hint 29 // autiasp > ** ret > ** mov x5, x0 > ** mov x6, x1 > ** mov x4, 1 > ** b .* > */ > > LGTM otherwise. thanks.