include/asm/string.h

0001 /* SPDX-License-Identifier: GPL-2.0 */
0002 #ifndef __ASM_ARM_STRING_H
0003 #define __ASM_ARM_STRING_H
0004
0005 /*
0006  * We don't do inline string functions, since the
0007  * optimised inline asm versions are not small.
0008  *
0009  * The __underscore versions of some functions are for KASan to be able
0010  * to replace them with instrumented versions.
0011  */
0012
0013 #define __HAVE_ARCH_STRRCHR
0014 extern char * strrchr(const char * s, int c);
0015
0016 #define __HAVE_ARCH_STRCHR
0017 extern char * strchr(const char * s, int c);
0018
0019 #define __HAVE_ARCH_MEMCPY
0020 extern void * memcpy(void *, const void *, __kernel_size_t);
0021 extern void *__memcpy(void *dest, const void *src, __kernel_size_t n);
0022
0023 #define __HAVE_ARCH_MEMMOVE
0024 extern void * memmove(void *, const void *, __kernel_size_t);
0025 extern void *__memmove(void *dest, const void *src, __kernel_size_t n);
0026
0027 #define __HAVE_ARCH_MEMCHR
0028 extern void * memchr(const void *, int, __kernel_size_t);
0029
0030 #define __HAVE_ARCH_MEMSET
0031 extern void * memset(void *, int, __kernel_size_t);
0032 extern void *__memset(void *s, int c, __kernel_size_t n);
0033
0034 #define __HAVE_ARCH_MEMSET32
0035 extern void *__memset32(uint32_t *, uint32_t v, __kernel_size_t);
0036 static inline void *memset32(uint32_t *p, uint32_t v, __kernel_size_t n)
0037 {
0038     return __memset32(p, v, n * 4);
0039 }
0040
0041 #define __HAVE_ARCH_MEMSET64
0042 extern void *__memset64(uint64_t *, uint32_t low, __kernel_size_t, uint32_t hi);
0043 static inline void *memset64(uint64_t *p, uint64_t v, __kernel_size_t n)
0044 {
0045     return __memset64(p, v, n * 8, v >> 32);
0046 }
0047
0048 /*
0049  * For files that are not instrumented (e.g. mm/slub.c) we
0050  * must use non-instrumented versions of the mem*
0051  * functions named __memcpy() etc. All such kernel code has
0052  * been tagged with KASAN_SANITIZE_file.o = n, which means
0053  * that the address sanitization argument isn't passed to the
0054  * compiler, and __SANITIZE_ADDRESS__ is not set. As a result
0055  * these defines kick in.
0056  */
0057 #if defined(CONFIG_KASAN) && !defined(__SANITIZE_ADDRESS__)
0058 #define memcpy(dst, src, len) __memcpy(dst, src, len)
0059 #define memmove(dst, src, len) __memmove(dst, src, len)
0060 #define memset(s, c, n) __memset(s, c, n)
0061
0062 #ifndef __NO_FORTIFY
0063 #define __NO_FORTIFY /* FORTIFY_SOURCE uses __builtin_memcpy, etc. */
0064 #endif
0065
0066 #endif
0067
0068 #endif