linux/arch/x86/boot/string.h
Chao Fan de50ce20cd x86/boot: Copy kstrtoull() to boot/string.c
Copy kstrtoull() and the other necessary functions from lib/kstrtox.c
to boot/string.c so that code in boot/ can use kstrtoull() and the old
simple_strtoull() can gradually be phased out.

Using div_u64() from math64.h directly will cause the dividend to be
handled as a 64-bit value and cause the infamous __divdi3 linker error
due to gcc trying to use its library function for the 64-bit division.

Therefore, separate the dividend into an upper and lower part.

 [ bp: Rewrite commit message. ]

Signed-off-by: Chao Fan <fanc.fnst@cn.fujitsu.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: bhe@redhat.com
Cc: caoj.fnst@cn.fujitsu.com
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: indou.takao@jp.fujitsu.com
Cc: Ingo Molnar <mingo@redhat.com>
Cc: kasong@redhat.com
Cc: Kees Cook <keescook@chromium.org>
Cc: msys.mizuma@gmail.com
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: x86-ml <x86@kernel.org>
Link: https://lkml.kernel.org/r/20190123110850.12433-2-fanc.fnst@cn.fujitsu.com
2019-02-01 11:52:54 +01:00

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1.1 KiB
C

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef BOOT_STRING_H
#define BOOT_STRING_H
/* Undef any of these macros coming from string_32.h. */
#undef memcpy
#undef memset
#undef memcmp
void *memcpy(void *dst, const void *src, size_t len);
void *memset(void *dst, int c, size_t len);
int memcmp(const void *s1, const void *s2, size_t len);
/*
* Access builtin version by default. If one needs to use optimized version,
* do "undef memcpy" in .c file and link against right string.c
*/
#define memcpy(d,s,l) __builtin_memcpy(d,s,l)
#define memset(d,c,l) __builtin_memset(d,c,l)
#define memcmp __builtin_memcmp
extern int strcmp(const char *str1, const char *str2);
extern int strncmp(const char *cs, const char *ct, size_t count);
extern size_t strlen(const char *s);
extern char *strstr(const char *s1, const char *s2);
extern char *strchr(const char *s, int c);
extern size_t strnlen(const char *s, size_t maxlen);
extern unsigned int atou(const char *s);
extern unsigned long long simple_strtoull(const char *cp, char **endp,
unsigned int base);
int kstrtoull(const char *s, unsigned int base, unsigned long long *res);
#endif /* BOOT_STRING_H */