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From: Szabolcs Nagy <nsz@sourceware.org>
To: glibc-cvs@sourceware.org
Subject: [glibc/arm/morello/main] aarch64: morello: purecap rawmemchr
Date: Wed, 26 Oct 2022 15:13:55 +0000 (GMT)	[thread overview]
Message-ID: <20221026151357.65D8C3853810@sourceware.org> (raw)

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=3ce49a6e0d992a3ecdafc5fb9ee7e00d2c5e43a9

commit 3ce49a6e0d992a3ecdafc5fb9ee7e00d2c5e43a9
Author: Carlos Eduardo Seo <carlos.seo@arm.com>
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
+   <https://www.gnu.org/licenses/>.  */
+
+#include <sysdep.h>
+
+/* 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)

             reply	other threads:[~2022-10-26 15:13 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-10-26 15:13 Szabolcs Nagy [this message]
  -- strict thread matches above, loose matches on Subject: below --
2022-11-23 14:42 Szabolcs Nagy
2022-10-27 13:52 Szabolcs Nagy
2022-08-05 19:32 Szabolcs Nagy

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