arc: Get rid of handwritten string routines

U-Boot is a bit special piese of software because it is being
only executed once on power-on as compared to operating system
for example. That's why we don't care much about performance
optimizations instead we're more concerned about size. And up-to-date
compilers might produce much smaller code compared to
performance-optimized routines copy-pasted from the Linux kernel.

Here's an example:
------------------------------->8--------------------------
--- size_asm_strings.txt
+++ size_c_strings.txt
@@ -1,2 +1,2 @@
    text	   data	    bss	    dec	    hex	filename
- 121260	   3784	   3308	 128352	  1f560	u-boot
+ 120448	   3784	   3308	 127540	  1f234	u-boot
------------------------------->8--------------------------

See we were able to shave off ~800 bytes of .text section.

Also usage of string routines implemented in C gives us an ability
to support more HW flavors for free: generated instructions will match
our target as long as correct compiler option is used.

Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>

1 files changed, 0 insertions, 26 deletions

diff --git a/arch/arc/include/asm/string.h b/arch/arc/include/asm/string.h
index 909129c3331..8b137891791 100644
--- a/arch/arc/include/asm/string.h
+++ b/arch/arc/include/asm/string.h
@@ -1,27 +1 @@
-/*
- * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. All rights reserved.
- *
- * SPDX-License-Identifier:	GPL-2.0+
- */
 
-#ifndef __ASM_ARC_STRING_H
-#define __ASM_ARC_STRING_H
-
-#define __HAVE_ARCH_MEMSET
-#define __HAVE_ARCH_MEMCPY
-#define __HAVE_ARCH_MEMCMP
-#define __HAVE_ARCH_STRCHR
-#define __HAVE_ARCH_STRCPY
-#define __HAVE_ARCH_STRCMP
-#define __HAVE_ARCH_STRLEN
-
-extern void *memset(void *ptr, int, __kernel_size_t);
-extern void *memcpy(void *, const void *, __kernel_size_t);
-extern void memzero(void *ptr, __kernel_size_t n);
-extern int memcmp(const void *, const void *, __kernel_size_t);
-extern char *strchr(const char *s, int c);
-extern char *strcpy(char *dest, const char *src);
-extern int strcmp(const char *cs, const char *ct);
-extern __kernel_size_t strlen(const char *);
-
-#endif /* __ASM_ARC_STRING_H */