// SPDX-License-Identifier: GPL-2.0/* * arch/arm/boot/compressed/string.c * * Small subset of simple string routines */ #define __NO_FORTIFY#include <linux/string.h> /* * The decompressor is built without KASan but uses the same redirects as the * rest of the kernel when CONFIG_KASAN is enabled, defining e.g. memcpy() * to __memcpy() but since we are not linking with the main kernel string * library in the decompressor, that will lead to link failures. * * Undefine KASan's versions, define the wrapped functions and alias them to * the right names so that when e.g. __memcpy() appear in the code, it will * still be linked to this local version of memcpy(). */#ifdef CONFIG_KASAN#undef memcpy#undef memmove#undef memsetvoid *__memcpy(void *__dest, __const void *__src, size_t __n) __alias(memcpy);void *__memmove(void *__dest, __const void *__src, size_t count) __alias(memmove);void *__memset(void *s, int c, size_t count) __alias(memset);#endif void *memcpy(void *__dest, __const void *__src, size_t __n){ int i = 0; unsigned char *d = (unsigned char *)__dest, *s = (unsigned char *)__src; for (i = __n >> 3; i > 0; i--) { *d++ = *s++; *d++ = *s++; *d++ = *s++; *d++ = *s++; *d++ = *s++; *d++ = *s++; *d++ = *s++; *d++ = *s++; } if (__n & 1 << 2) { *d++ = *s++; *d++ = *s++; *d++ = *s++; *d++ = *s++; } if (__n & 1 << 1) { *d++ = *s++; *d++ = *s++; } if (__n & 1) *d++ = *s++; return __dest;} void *memmove(void *__dest, __const void *__src, size_t count){ unsigned char *d = __dest; const unsigned char *s = __src; if (__dest == __src) return __dest; if (__dest < __src) return memcpy(__dest, __src, count); while (count--) d[count] = s[count]; return __dest;} size_t strlen(const char *s){ const char *sc = s; while (*sc != '\0') sc++; return sc - s;} size_t strnlen(const char *s, size_t count){ const char *sc; for (sc = s; count-- && *sc != '\0'; ++sc) /* nothing */; return sc - s;} int memcmp(const void *cs, const void *ct, size_t count){ const unsigned char *su1 = cs, *su2 = ct, *end = su1 + count; int res = 0; while (su1 < end) { res = *su1++ - *su2++; if (res) break; } return res;} int strcmp(const char *cs, const char *ct){ unsigned char c1, c2; int res = 0; do { c1 = *cs++; c2 = *ct++; res = c1 - c2; if (res) break; } while (c1); return res;} void *memchr(const void *s, int c, size_t count){ const unsigned char *p = s; while (count--) if ((unsigned char)c == *p++) return (void *)(p - 1); return NULL;} char *strchr(const char *s, int c){ while (*s != (char)c) if (*s++ == '\0') return NULL; return (char *)s;} char *strrchr(const char *s, int c){ const char *last = NULL; do { if (*s == (char)c) last = s; } while (*s++); return (char *)last;} #undef memset void *memset(void *s, int c, size_t count){ char *xs = s; while (count--) *xs++ = c; return s;}
// SPDX-License-Identifier: GPL-2.0
/*
* arch/arm/boot/compressed/string.c
*
* Small subset of simple string routines
*/
#define __NO_FORTIFY
#include <linux/string.h>
/*
* The decompressor is built without KASan but uses the same redirects as the
* rest of the kernel when CONFIG_KASAN is enabled, defining e.g. memcpy()
* to __memcpy() but since we are not linking with the main kernel string
* library in the decompressor, that will lead to link failures.
*
* Undefine KASan's versions, define the wrapped functions and alias them to
* the right names so that when e.g. __memcpy() appear in the code, it will
* still be linked to this local version of memcpy().
*/
#ifdef CONFIG_KASAN
#undef memcpy
#undef memmove
#undef memset
void *__memcpy(void *__dest, __const void *__src, size_t __n) __alias(memcpy);
void *__memmove(void *__dest, __const void *__src, size_t count) __alias(memmove);
void *__memset(void *s, int c, size_t count) __alias(memset);
#endif
void *memcpy(void *__dest, __const void *__src, size_t __n)
{
int i = 0;
unsigned char *d = (unsigned char *)__dest, *s = (unsigned char *)__src;
for (i = __n >> 3; i > 0; i--) {
*d++ = *s++;
*d++ = *s++;
*d++ = *s++;
*d++ = *s++;
*d++ = *s++;
*d++ = *s++;
*d++ = *s++;
*d++ = *s++;
}
if (__n & 1 << 2) {
*d++ = *s++;
*d++ = *s++;
*d++ = *s++;
*d++ = *s++;
}
if (__n & 1 << 1) {
*d++ = *s++;
*d++ = *s++;
}
if (__n & 1)
*d++ = *s++;
return __dest;
}
void *memmove(void *__dest, __const void *__src, size_t count)
{
unsigned char *d = __dest;
const unsigned char *s = __src;
if (__dest == __src)
return __dest;
if (__dest < __src)
return memcpy(__dest, __src, count);
while (count--)
d[count] = s[count];
return __dest;
}
size_t strlen(const char *s)
{
const char *sc = s;
while (*sc != '\0')
sc++;
return sc - s;
}
size_t strnlen(const char *s, size_t count)
{
const char *sc;
for (sc = s; count-- && *sc != '\0'; ++sc)
/* nothing */;
return sc - s;
}
int memcmp(const void *cs, const void *ct, size_t count)
{
const unsigned char *su1 = cs, *su2 = ct, *end = su1 + count;
int res = 0;
while (su1 < end) {
res = *su1++ - *su2++;
if (res)
break;
}
return res;
}
int strcmp(const char *cs, const char *ct)
{
unsigned char c1, c2;
int res = 0;
do {
c1 = *cs++;
c2 = *ct++;
res = c1 - c2;
if (res)
break;
} while (c1);
return res;
}
void *memchr(const void *s, int c, size_t count)
{
const unsigned char *p = s;
while (count--)
if ((unsigned char)c == *p++)
return (void *)(p - 1);
return NULL;
}
char *strchr(const char *s, int c)
{
while (*s != (char)c)
if (*s++ == '\0')
return NULL;
return (char *)s;
}
char *strrchr(const char *s, int c)
{
const char *last = NULL;
do {
if (*s == (char)c)
last = s;
} while (*s++);
return (char *)last;
}
#undef memset
void *memset(void *s, int c, size_t count)
{
char *xs = s;
while (count--)
*xs++ = c;
return s;
}