glibc-2.3.2-arm-fix-strlen.patch

linux下编译交叉工具链的工具源码

See also
http://lists.gnu.org/archive/html/bug-glibc/2002-12/msg00056.html
http://lists.arm.linux.org.uk/pipermail/linux-arm-toolchain/2004-June/000016.html

2002-12-12  Andreas Schwab  <[e-mail]>
        * sysdeps/arm/strlen.S: Fix last word check for big endian.

To: libc-alpha at sources dot redhat dot com
Subject: [PATCH] REPOST: ARM big-endian strlen() fix
References: <[e-mail]>
From: Krzysztof Halasa <khc at pm dot waw dot pl>
Date: Thu, 10 Jun 2004 13:41:44 +0200
Message-ID: <[e-mail]>
MIME-Version: 1.0
Content-Type: multipart/mixed; boundary="=-=-="

--=-=-=

The attached patch fixes strlen() on big-endian ARM. Please apply.
Thanks.
-- 
Krzysztof Halasa, B*FH

--=-=-=
Content-Type: text/x-patch
Content-Disposition: inline; filename=glibc-strlen.patch

--- glibc-2.3.3.old/sysdeps/arm/strlen.S	2003-04-30 00:47:20.000000000 +0200
+++ glibc-2.3.3/sysdeps/arm/strlen.S	2004-06-06 03:21:48.351931240 +0200
@@ -53,12 +53,21 @@
 	ldrne   r2, [r1], $4            @ and we continue to the next word
 	bne     Laligned                @
 Llastword:				@ drop through to here once we find a
+#ifdef __ARMEB__
+	tst     r2, $0xff000000         @ word that has a zero byte in it
+	addne   r0, r0, $1              @
+	tstne   r2, $0x00ff0000         @ and add up to 3 bytes on to it
+	addne   r0, r0, $1              @
+	tstne   r2, $0x0000ff00         @ (if first three all non-zero, 4th
+	addne   r0, r0, $1              @  must be zero)
+#else
 	tst     r2, $0x000000ff         @ word that has a zero byte in it
 	addne   r0, r0, $1              @
 	tstne   r2, $0x0000ff00         @ and add up to 3 bytes on to it
 	addne   r0, r0, $1              @
 	tstne   r2, $0x00ff0000         @ (if first three all non-zero, 4th
 	addne   r0, r0, $1              @  must be zero)
+#endif
 	RETINSTR(mov,pc,lr)
 END(strlen)
 libc_hidden_builtin_def (strlen)

--=-=-=--