From patchwork Wed Jun 10 21:36:08 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Samuel Thibault X-Patchwork-Id: 1307232 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=sourceware.org (client-ip=8.43.85.97; helo=sourceware.org; envelope-from=libc-alpha-bounces@sourceware.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=ens-lyon.org Received: from sourceware.org (server2.sourceware.org [8.43.85.97]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 49j0fw2v9Tz9sRK for ; Thu, 11 Jun 2020 07:36:24 +1000 (AEST) Received: from server2.sourceware.org (localhost [IPv6:::1]) by sourceware.org (Postfix) with ESMTP id 13ED23939C1E; Wed, 10 Jun 2020 21:36:18 +0000 (GMT) X-Original-To: libc-alpha@sourceware.org Delivered-To: libc-alpha@sourceware.org Received: from hera.aquilenet.fr (hera.aquilenet.fr [IPv6:2a0c:e300::1]) by sourceware.org (Postfix) with ESMTPS id 474723893679 for ; Wed, 10 Jun 2020 21:36:13 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.3.2 sourceware.org 474723893679 Authentication-Results: sourceware.org; dmarc=none (p=none dis=none) header.from=ens-lyon.org Authentication-Results: sourceware.org; spf=fail smtp.mailfrom=samuel.thibault@ens-lyon.org Received: from localhost (localhost [127.0.0.1]) by hera.aquilenet.fr (Postfix) with ESMTP id 6EA8585BD; Wed, 10 Jun 2020 23:36:12 +0200 (CEST) X-Virus-Scanned: Debian amavisd-new at aquilenet.fr Received: from hera.aquilenet.fr ([127.0.0.1]) by localhost (hera.aquilenet.fr [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id qM-QelhI9ztm; Wed, 10 Jun 2020 23:36:10 +0200 (CEST) Received: from function.home (lfbn-bor-1-797-11.w86-234.abo.wanadoo.fr [86.234.239.11]) by hera.aquilenet.fr (Postfix) with ESMTPSA id D890A48A4; Wed, 10 Jun 2020 23:36:09 +0200 (CEST) Received: from samy by function.home with local (Exim 4.93) (envelope-from ) id 1jj8OG-005bOd-OW; Wed, 10 Jun 2020 23:36:08 +0200 From: Samuel Thibault To: libc-alpha@sourceware.org Subject: [hurd, commited 2/2] hurd: document that gcc&gdb look at the trampoline code Date: Wed, 10 Jun 2020 23:36:08 +0200 Message-Id: <20200610213608.1335341-3-samuel.thibault@ens-lyon.org> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200610213608.1335341-1-samuel.thibault@ens-lyon.org> References: <20200610213608.1335341-1-samuel.thibault@ens-lyon.org> MIME-Version: 1.0 X-Spam-Status: No, score=-11.4 required=5.0 tests=BAYES_00, GIT_PATCH_0, JMQ_SPF_NEUTRAL, KAM_DMARC_STATUS, SPF_HELO_PASS, SPF_NEUTRAL, TXREP autolearn=ham autolearn_force=no version=3.4.2 X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: commit-hurd@gnu.org Errors-To: libc-alpha-bounces@sourceware.org Sender: "Libc-alpha" * sysdeps/mach/hurd/i386/trampoline.c (rpc_wait_trampoline): Document which gcc and gdb files look at the code of the trampoline. --- sysdeps/mach/hurd/i386/trampoline.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/sysdeps/mach/hurd/i386/trampoline.c b/sysdeps/mach/hurd/i386/trampoline.c index e7eb316fce..8c7976919c 100644 --- a/sysdeps/mach/hurd/i386/trampoline.c +++ b/sysdeps/mach/hurd/i386/trampoline.c @@ -227,7 +227,11 @@ _hurd_setup_sighandler (struct hurd_sigstate *ss, __sighandler_t handler, } /* The trampoline code follows. This used to be located inside - _hurd_setup_sighandler, but was optimized away by gcc 2.95. */ + _hurd_setup_sighandler, but was optimized away by gcc 2.95. + + If you modify this, update + - in gcc: libgcc/config/i386/gnu-unwind.h x86_gnu_fallback_frame_state, + - in gdb: gdb/i386-gnu-tdep.c gnu_sigtramp_code. */ asm ("rpc_wait_trampoline:\n"); /* This is the entry point when we have an RPC reply message to receive