Inital import

[l4.git] / l4 / pkg / uclibc / lib / contrib / uclibc / libc / string / arm / memcmp.S

diff --git a/l4/pkg/uclibc/lib/contrib/uclibc/libc/string/arm/memcmp.S b/l4/pkg/uclibc/lib/contrib/uclibc/libc/string/arm/memcmp.S
new file mode 100644 (file)
index 0000000..65409f4
--- /dev/null
+++ b/l4/pkg/uclibc/lib/contrib/uclibc/libc/string/arm/memcmp.S
@@ -0,0 +1,96 @@
+/*
+ * Copyright (c) 2002 ARM Ltd
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the company may not be used to endorse or promote
+ *    products derived from this software without specific prior written
+ *    permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY ARM LTD ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL ARM LTD BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
+ * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * Adapted for uClibc from NetBSD memcmp.S, version 1.2 2003/04/05
+ * by Erik Andersen <andersen@codepoet.org>
+ */
+
+#include <features.h>
+#include <bits/arm_asm.h>
+
+.text
+.global memcmp
+.type memcmp,%function
+.align 4
+
+#if defined(THUMB1_ONLY)
+.thumb_func
+memcmp:
+       cmp     r2, #0
+       bne     1f
+       mov     r0, #0
+       bx      lr
+1:
+       push    {r4}
+       add     r4, r0, r2
+2:
+       ldrb    r2, [r0]
+       add     r0, r0, #1
+       ldrb    r3, [r1]
+       add     r1, r1, #1
+       cmp     r4, r0
+       beq     3f
+       cmp     r2, r3
+       beq     2b
+3:
+       sub     r0, r2, r3
+        pop    {r4}
+       bx      lr
+#else
+memcmp:
+       /* if ((len - 1) < 0) return 0 */
+       subs    r2, r2, #1
+       IT(tt, mi)
+       movmi   r0, #0
+#if defined(__USE_BX__)
+        bxmi    lr
+#else
+       movmi   pc, lr
+#endif
+       /* ip == last src address to compare */
+       add     ip, r0, r2
+1:
+       ldrb    r2, [r0], #1
+       ldrb    r3, [r1], #1
+       cmp     ip, r0
+       IT(t, cs)
+       cmpcs   r2, r3
+       beq     1b
+       sub     r0, r2, r3
+#if defined(__USE_BX__)
+        bx      lr
+#else
+       mov     pc, lr
+#endif
+#endif
+
+.size memcmp,.-memcmp
+
+libc_hidden_def(memcmp)
+#ifdef __UCLIBC_SUSV3_LEGACY__
+strong_alias(memcmp,bcmp)
+#endif