From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by sourceware.org (Postfix) with ESMTPS id 677273858C39 for ; Fri, 13 Jan 2023 18:03:00 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.2 sourceware.org 677273858C39 Authentication-Results: sourceware.org; dmarc=pass (p=none dis=none) header.from=redhat.com Authentication-Results: sourceware.org; spf=pass smtp.mailfrom=redhat.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1673632979; h=from:from:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type:in-reply-to:in-reply-to: references:references; bh=SwRcw7pgtH17Ib0VA9NwcgQlimrh1YCQAkYGBzIYfEM=; b=TBfvrxgDEIijjN4CNpOZb0vkRWE6ZYXC6vy9qM4QBUeOQBr2NMeX5HeAwVPbu3Dmu605hX QlZ5ThajoMzIFdGMLG+Xh+W8HXdPNhm/DPVzfxBVNCBbtAglgDHxwG8Fx0ck5ZtciOLcM6 KKnn9uFHCe4GDZm6dwuTL76t1vsJnCE= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-307-gy3xaORyNbKFWSf1nvr1MQ-1; Fri, 13 Jan 2023 13:02:53 -0500 X-MC-Unique: gy3xaORyNbKFWSf1nvr1MQ-1 Received: from smtp.corp.redhat.com (int-mx10.intmail.prod.int.rdu2.redhat.com [10.11.54.10]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 48DB4101A52E; Fri, 13 Jan 2023 18:02:53 +0000 (UTC) Received: from tucnak.zalov.cz (unknown [10.39.192.223]) by smtp.corp.redhat.com (Postfix) with ESMTPS id E84F9492B00; Fri, 13 Jan 2023 18:02:52 +0000 (UTC) Received: from tucnak.zalov.cz (localhost [127.0.0.1]) by tucnak.zalov.cz (8.17.1/8.17.1) with ESMTPS id 30DI2nCu1363971 (version=TLSv1.3 cipher=TLS_AES_256_GCM_SHA384 bits=256 verify=NOT); Fri, 13 Jan 2023 19:02:50 +0100 Received: (from jakub@localhost) by tucnak.zalov.cz (8.17.1/8.17.1/Submit) id 30DI2mEb1363970; Fri, 13 Jan 2023 19:02:48 +0100 Date: Fri, 13 Jan 2023 19:02:47 +0100 From: Jakub Jelinek To: Srinath Parvathaneni Cc: gcc Patches , Richard Earnshaw , Kyrylo Tkachov Subject: Re: [GCC][PATCH 13/15, v5] arm: Add support for dwarf debug directives and pseudo hard-register for PAC feature. Message-ID: Reply-To: Jakub Jelinek References: MIME-Version: 1.0 In-Reply-To: X-Scanned-By: MIMEDefang 3.1 on 10.11.54.10 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=us-ascii Content-Disposition: inline X-Spam-Status: No, score=-3.5 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE,RCVD_IN_MSPIKE_H2,SPF_HELO_NONE,SPF_NONE,TXREP autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org List-Id: On Fri, Jan 13, 2023 at 05:44:15PM +0000, Srinath Parvathaneni via Gcc-patches wrote: > Hello, > > This patch teaches the DWARF support in gcc about RA_AUTH_CODE pseudo hard-register and also > updates the ".save", ".cfi_register", ".cfi_offset", ".cfi_restore" directives accordingly. > This patch also adds support to emit ".pacspval" directive when "pac ip, lr, sp" instruction > in generated in the assembly. > > RA_AUTH_CODE register number is 107 and it's dwarf register number is 143. I'm afraid increasing number of DWARF registers is ABI incompatible change. E.g. libgcc __frame_state_for function fills in: typedef struct frame_state { void *cfa; void *eh_ptr; long cfa_offset; long args_size; long reg_or_offset[PRE_GCC3_DWARF_FRAME_REGISTERS+1]; unsigned short cfa_reg; unsigned short retaddr_column; char saved[PRE_GCC3_DWARF_FRAME_REGISTERS+1]; } frame_state; structure, where PRE_GCC3_DWARF_FRAME_REGISTERS defaults to __LIBGCC_DWARF_FRAME_REGISTERS__, which is defined to DWARF_FRAME_REGISTERS, which defaults to FIRST_PSEUDO_REGISTER. So, changing FIRST_PSEUDO_REGISTER is an ABI change unless you arrange for PRE_GCC3_DWARF_FRAME_REGISTERS to be defined to the old value. Jakub