summaryrefslogtreecommitdiffstats
path: root/kernel/arch/xtensa/include/asm/string.h
diff options
context:
space:
mode:
Diffstat (limited to 'kernel/arch/xtensa/include/asm/string.h')
-rw-r--r--kernel/arch/xtensa/include/asm/string.h121
1 files changed, 121 insertions, 0 deletions
diff --git a/kernel/arch/xtensa/include/asm/string.h b/kernel/arch/xtensa/include/asm/string.h
new file mode 100644
index 000000000..8d5d9dfad
--- /dev/null
+++ b/kernel/arch/xtensa/include/asm/string.h
@@ -0,0 +1,121 @@
+/*
+ * 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
+static 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
+static 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
+static 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, %2, %3"
+ : "=r" (__cs), "=r" (__ct), "=&r" (__res), "=&r" (__dummy)
+ : "0" (__cs), "1" (__ct));
+
+ return __res;
+}
+
+#define __HAVE_ARCH_STRNCMP
+static 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, %2, %3"
+ : "=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
+
+#endif /* _XTENSA_STRING_H */