From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 1944) id BDEBC3851521; Thu, 27 Oct 2022 13:52:31 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org BDEBC3851521 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sourceware.org; s=default; t=1666878751; bh=5RPwNylaozwpfyyVZ92jjpBbsy/9qqK4xOhAhEDLCws=; h=From:To:Subject:Date:From; b=KFZFMfoCYTjYK0J3EDLOaMAP/gPeRMbLvoBJWFMGAHapOyUrGZhZpXAoLIx50sLpQ OL9q1yXzL5Axpc+Wq+bPDPSF9HBTQ0X9cntN99y85GjRPK1okuXXglqubI7HFfB/hr dDbpjGE3dpNXigL8BsM/ZU2dGYSYZoeabSa98cd4= Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit From: Szabolcs Nagy To: glibc-cvs@sourceware.org Subject: [glibc/arm/morello/main] aarch64: morello: purecap rawmemchr X-Act-Checkin: glibc X-Git-Author: Carlos Eduardo Seo X-Git-Refname: refs/heads/arm/morello/main X-Git-Oldrev: 2721402968a36621ce027fa31c0f47a6c97f0fc8 X-Git-Newrev: 61c8e4890382f52761cd2821f71e8021c744a39d Message-Id: <20221027135231.BDEBC3851521@sourceware.org> Date: Thu, 27 Oct 2022 13:52:31 +0000 (GMT) List-Id: https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=61c8e4890382f52761cd2821f71e8021c744a39d commit 61c8e4890382f52761cd2821f71e8021c744a39d Author: Carlos Eduardo Seo Date: Mon Jul 12 15:06:26 2021 -0300 aarch64: morello: purecap rawmemchr Modified rawmemchr to support Arm Morello Capabilities. Diff: --- sysdeps/aarch64/morello/rawmemchr.S | 43 +++++++++++++++++++++++++++++++++++++ 1 file changed, 43 insertions(+) diff --git a/sysdeps/aarch64/morello/rawmemchr.S b/sysdeps/aarch64/morello/rawmemchr.S new file mode 100644 index 0000000000..10e89ee6b7 --- /dev/null +++ b/sysdeps/aarch64/morello/rawmemchr.S @@ -0,0 +1,43 @@ +/* rawmemchr - find a character in a memory zone + + Copyright (C) 2022 Free Software Foundation, Inc. + + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library. If not, see + . */ + +#include + +/* Special case rawmemchr (s, 0) as strlen, otherwise tailcall memchr. + Call strlen without setting up a full frame - it preserves x14/x15. +*/ + +ENTRY (__rawmemchr) + + cbz w1, L(do_strlen) + mov x2, -1 + b __memchr + +L(do_strlen): + mov c15, c30 + cfi_return_column (c15) + mov c14, c0 + bl __strlen + add c0, c14, x0 + ret c15 + +END (__rawmemchr) +weak_alias (__rawmemchr, rawmemchr) +libc_hidden_builtin_def (__rawmemchr)