LXR linux/arch/arm/include/asm/string.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2#ifndef __ASM_ARM_STRING_H
   3#define __ASM_ARM_STRING_H
   4
   5/*
   6 * We don't do inline string functions, since the
   7 * optimised inline asm versions are not small.
   8 *
   9 * The __underscore versions of some functions are for KASan to be able
  10 * to replace them with instrumented versions.
  11 */
  12
  13#define __HAVE_ARCH_STRRCHR
  14extern char * strrchr(const char * s, int c);
  15
  16#define __HAVE_ARCH_STRCHR
  17extern char * strchr(const char * s, int c);
  18
  19#define __HAVE_ARCH_MEMCPY
  20extern void * memcpy(void *, const void *, __kernel_size_t);
  21extern void *__memcpy(void *dest, const void *src, __kernel_size_t n);
  22
  23#define __HAVE_ARCH_MEMMOVE
  24extern void * memmove(void *, const void *, __kernel_size_t);
  25extern void *__memmove(void *dest, const void *src, __kernel_size_t n);
  26
  27#define __HAVE_ARCH_MEMCHR
  28extern void * memchr(const void *, int, __kernel_size_t);
  29
  30#define __HAVE_ARCH_MEMSET
  31extern void * memset(void *, int, __kernel_size_t);
  32extern void *__memset(void *s, int c, __kernel_size_t n);
  33
  34#define __HAVE_ARCH_MEMSET32
  35extern void *__memset32(uint32_t *, uint32_t v, __kernel_size_t);
  36static inline void *memset32(uint32_t *p, uint32_t v, __kernel_size_t n)
  37{
  38        return __memset32(p, v, n * 4);
  39}
  40
  41#define __HAVE_ARCH_MEMSET64
  42extern void *__memset64(uint64_t *, uint32_t low, __kernel_size_t, uint32_t hi);
  43static inline void *memset64(uint64_t *p, uint64_t v, __kernel_size_t n)
  44{
  45        return __memset64(p, v, n * 8, v >> 32);
  46}
  47
  48/*
  49 * For files that are not instrumented (e.g. mm/slub.c) we
  50 * must use non-instrumented versions of the mem*
  51 * functions named __memcpy() etc. All such kernel code has
  52 * been tagged with KASAN_SANITIZE_file.o = n, which means
  53 * that the address sanitization argument isn't passed to the
  54 * compiler, and __SANITIZE_ADDRESS__ is not set. As a result
  55 * these defines kick in.
  56 */
  57#if defined(CONFIG_KASAN) && !defined(__SANITIZE_ADDRESS__)
  58#define memcpy(dst, src, len) __memcpy(dst, src, len)
  59#define memmove(dst, src, len) __memmove(dst, src, len)
  60#define memset(s, c, n) __memset(s, c, n)
  61
  62#ifndef __NO_FORTIFY
  63#define __NO_FORTIFY /* FORTIFY_SOURCE uses __builtin_memcpy, etc. */
  64#endif
  65
  66#endif
  67
  68#endif
  69