[PATCH] xtensa: Architecture support for Tensilica Xtensa Part 6

The attached patches provides part 6 of an architecture implementation for the
Tensilica Xtensa CPU series.

Signed-off-by: Chris Zankel <chris@zankel.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 124 insertions, 0 deletions

diff --git a/include/asm-xtensa/string.h b/include/asm-xtensa/string.h
new file mode 100644
index 000000000000..3f81b27d9809
--- /dev/null
+++ b/include/asm-xtensa/string.h
@@ -0,0 +1,124 @@
+/*
+ * include/asm-xtensa/string.h
+ *
+ * These trivial string functions are considered part of the public domain.
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2001 - 2005 Tensilica Inc.
+ */
+
+/* We should optimize these. See arch/xtensa/lib/strncpy_user.S */
+
+#ifndef _XTENSA_STRING_H
+#define _XTENSA_STRING_H
+
+#define __HAVE_ARCH_STRCPY
+extern __inline__ char *strcpy(char *__dest, const char *__src)
+{
+        register char *__xdest = __dest;
+        unsigned long __dummy;
+
+        __asm__ __volatile__("1:\n\t"
+                "l8ui   %2, %1, 0\n\t"
+                "s8i    %2, %0, 0\n\t"
+                "addi   %1, %1, 1\n\t"
+                "addi   %0, %0, 1\n\t"
+                "bnez   %2, 1b\n\t"
+                : "=r" (__dest), "=r" (__src), "=&r" (__dummy)
+                : "0" (__dest), "1" (__src)
+                : "memory");
+
+        return __xdest;
+}
+
+#define __HAVE_ARCH_STRNCPY
+extern __inline__ char *strncpy(char *__dest, const char *__src, size_t __n)
+{
+        register char *__xdest = __dest;
+        unsigned long __dummy;
+
+        if (__n == 0)
+                return __xdest;
+
+        __asm__ __volatile__(
+                "1:\n\t"
+                "l8ui   %2, %1, 0\n\t"
+                "s8i    %2, %0, 0\n\t"
+                "addi   %1, %1, 1\n\t"
+                "addi   %0, %0, 1\n\t"
+                "beqz   %2, 2f\n\t"
+                "bne    %1, %5, 1b\n"
+                "2:"
+                : "=r" (__dest), "=r" (__src), "=&r" (__dummy)
+                : "0" (__dest), "1" (__src), "r" (__src+__n)
+                : "memory");
+
+        return __xdest;
+}
+
+#define __HAVE_ARCH_STRCMP
+extern __inline__ int strcmp(const char *__cs, const char *__ct)
+{
+        register int __res;
+        unsigned long __dummy;
+
+        __asm__ __volatile__(
+                "1:\n\t"
+                "l8ui   %3, %1, 0\n\t"
+                "addi   %1, %1, 1\n\t"
+                "l8ui   %2, %0, 0\n\t"
+                "addi   %0, %0, 1\n\t"
+                "beqz   %2, 2f\n\t"
+                "beq    %2, %3, 1b\n"
+                "2:\n\t"
+                "sub    %2, %3, %2"
+                : "=r" (__cs), "=r" (__ct), "=&r" (__res), "=&r" (__dummy)
+                : "0" (__cs), "1" (__ct));
+
+        return __res;
+}
+
+#define __HAVE_ARCH_STRNCMP
+extern __inline__ int strncmp(const char *__cs, const char *__ct, size_t __n)
+{
+        register int __res;
+        unsigned long __dummy;
+
+        __asm__ __volatile__(
+                "mov    %2, %3\n"
+                "1:\n\t"
+                "beq    %0, %6, 2f\n\t"
+                "l8ui   %3, %1, 0\n\t"
+                "addi   %1, %1, 1\n\t"
+                "l8ui   %2, %0, 0\n\t"
+                "addi   %0, %0, 1\n\t"
+                "beqz   %2, 2f\n\t"
+                "beqz   %3, 2f\n\t"
+                "beq    %2, %3, 1b\n"
+                "2:\n\t"
+                "sub    %2, %3, %2"
+                : "=r" (__cs), "=r" (__ct), "=&r" (__res), "=&r" (__dummy)
+                : "0" (__cs), "1" (__ct), "r" (__cs+__n));
+
+        return __res;
+}
+
+#define __HAVE_ARCH_MEMSET
+extern void *memset(void *__s, int __c, size_t __count);
+
+#define __HAVE_ARCH_MEMCPY
+extern void *memcpy(void *__to, __const__ void *__from, size_t __n);
+
+#define __HAVE_ARCH_MEMMOVE
+extern void *memmove(void *__dest, __const__ void *__src, size_t __n);
+
+/* Don't build bcopy at all ...  */
+#define __HAVE_ARCH_BCOPY
+
+#define __HAVE_ARCH_MEMSCAN
+#define memscan memchr
+
+#endif  /* _XTENSA_STRING_H */