mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 17:30:02 +00:00
![Matthew Wilcox](/assets/img/avatar_default.png)
These are single instructions on x86. There's no 64-bit instruction for x86-32, but we don't yet have any user for memset64() on 32-bit architectures, so don't bother to implement it. Link: http://lkml.kernel.org/r/20170720184539.31609-4-willy@infradead.org Signed-off-by: Matthew Wilcox <mawilcox@microsoft.com> Cc: Minchan Kim <minchan@kernel.org> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Ingo Molnar <mingo@elte.hu> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: "James E.J. Bottomley" <jejb@linux.vnet.ibm.com> Cc: "Martin K. Petersen" <martin.petersen@oracle.com> Cc: David Miller <davem@davemloft.net> Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Cc: Matt Turner <mattst88@gmail.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Richard Henderson <rth@twiddle.net> Cc: Russell King <rmk+kernel@armlinux.org.uk> Cc: Sam Ravnborg <sam@ravnborg.org> Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
375 lines
8.5 KiB
C
375 lines
8.5 KiB
C
#ifndef _ASM_X86_STRING_32_H
|
|
#define _ASM_X86_STRING_32_H
|
|
|
|
#ifdef __KERNEL__
|
|
|
|
/* Let gcc decide whether to inline or use the out of line functions */
|
|
|
|
#define __HAVE_ARCH_STRCPY
|
|
extern char *strcpy(char *dest, const char *src);
|
|
|
|
#define __HAVE_ARCH_STRNCPY
|
|
extern char *strncpy(char *dest, const char *src, size_t count);
|
|
|
|
#define __HAVE_ARCH_STRCAT
|
|
extern char *strcat(char *dest, const char *src);
|
|
|
|
#define __HAVE_ARCH_STRNCAT
|
|
extern char *strncat(char *dest, const char *src, size_t count);
|
|
|
|
#define __HAVE_ARCH_STRCMP
|
|
extern int strcmp(const char *cs, const char *ct);
|
|
|
|
#define __HAVE_ARCH_STRNCMP
|
|
extern int strncmp(const char *cs, const char *ct, size_t count);
|
|
|
|
#define __HAVE_ARCH_STRCHR
|
|
extern char *strchr(const char *s, int c);
|
|
|
|
#define __HAVE_ARCH_STRLEN
|
|
extern size_t strlen(const char *s);
|
|
|
|
static __always_inline void *__memcpy(void *to, const void *from, size_t n)
|
|
{
|
|
int d0, d1, d2;
|
|
asm volatile("rep ; movsl\n\t"
|
|
"movl %4,%%ecx\n\t"
|
|
"andl $3,%%ecx\n\t"
|
|
"jz 1f\n\t"
|
|
"rep ; movsb\n\t"
|
|
"1:"
|
|
: "=&c" (d0), "=&D" (d1), "=&S" (d2)
|
|
: "0" (n / 4), "g" (n), "1" ((long)to), "2" ((long)from)
|
|
: "memory");
|
|
return to;
|
|
}
|
|
|
|
/*
|
|
* This looks ugly, but the compiler can optimize it totally,
|
|
* as the count is constant.
|
|
*/
|
|
static __always_inline void *__constant_memcpy(void *to, const void *from,
|
|
size_t n)
|
|
{
|
|
long esi, edi;
|
|
if (!n)
|
|
return to;
|
|
|
|
switch (n) {
|
|
case 1:
|
|
*(char *)to = *(char *)from;
|
|
return to;
|
|
case 2:
|
|
*(short *)to = *(short *)from;
|
|
return to;
|
|
case 4:
|
|
*(int *)to = *(int *)from;
|
|
return to;
|
|
case 3:
|
|
*(short *)to = *(short *)from;
|
|
*((char *)to + 2) = *((char *)from + 2);
|
|
return to;
|
|
case 5:
|
|
*(int *)to = *(int *)from;
|
|
*((char *)to + 4) = *((char *)from + 4);
|
|
return to;
|
|
case 6:
|
|
*(int *)to = *(int *)from;
|
|
*((short *)to + 2) = *((short *)from + 2);
|
|
return to;
|
|
case 8:
|
|
*(int *)to = *(int *)from;
|
|
*((int *)to + 1) = *((int *)from + 1);
|
|
return to;
|
|
}
|
|
|
|
esi = (long)from;
|
|
edi = (long)to;
|
|
if (n >= 5 * 4) {
|
|
/* large block: use rep prefix */
|
|
int ecx;
|
|
asm volatile("rep ; movsl"
|
|
: "=&c" (ecx), "=&D" (edi), "=&S" (esi)
|
|
: "0" (n / 4), "1" (edi), "2" (esi)
|
|
: "memory"
|
|
);
|
|
} else {
|
|
/* small block: don't clobber ecx + smaller code */
|
|
if (n >= 4 * 4)
|
|
asm volatile("movsl"
|
|
: "=&D"(edi), "=&S"(esi)
|
|
: "0"(edi), "1"(esi)
|
|
: "memory");
|
|
if (n >= 3 * 4)
|
|
asm volatile("movsl"
|
|
: "=&D"(edi), "=&S"(esi)
|
|
: "0"(edi), "1"(esi)
|
|
: "memory");
|
|
if (n >= 2 * 4)
|
|
asm volatile("movsl"
|
|
: "=&D"(edi), "=&S"(esi)
|
|
: "0"(edi), "1"(esi)
|
|
: "memory");
|
|
if (n >= 1 * 4)
|
|
asm volatile("movsl"
|
|
: "=&D"(edi), "=&S"(esi)
|
|
: "0"(edi), "1"(esi)
|
|
: "memory");
|
|
}
|
|
switch (n % 4) {
|
|
/* tail */
|
|
case 0:
|
|
return to;
|
|
case 1:
|
|
asm volatile("movsb"
|
|
: "=&D"(edi), "=&S"(esi)
|
|
: "0"(edi), "1"(esi)
|
|
: "memory");
|
|
return to;
|
|
case 2:
|
|
asm volatile("movsw"
|
|
: "=&D"(edi), "=&S"(esi)
|
|
: "0"(edi), "1"(esi)
|
|
: "memory");
|
|
return to;
|
|
default:
|
|
asm volatile("movsw\n\tmovsb"
|
|
: "=&D"(edi), "=&S"(esi)
|
|
: "0"(edi), "1"(esi)
|
|
: "memory");
|
|
return to;
|
|
}
|
|
}
|
|
|
|
#define __HAVE_ARCH_MEMCPY
|
|
extern void *memcpy(void *, const void *, size_t);
|
|
|
|
#ifndef CONFIG_FORTIFY_SOURCE
|
|
#ifdef CONFIG_X86_USE_3DNOW
|
|
|
|
#include <asm/mmx.h>
|
|
|
|
/*
|
|
* This CPU favours 3DNow strongly (eg AMD Athlon)
|
|
*/
|
|
|
|
static inline void *__constant_memcpy3d(void *to, const void *from, size_t len)
|
|
{
|
|
if (len < 512)
|
|
return __constant_memcpy(to, from, len);
|
|
return _mmx_memcpy(to, from, len);
|
|
}
|
|
|
|
static inline void *__memcpy3d(void *to, const void *from, size_t len)
|
|
{
|
|
if (len < 512)
|
|
return __memcpy(to, from, len);
|
|
return _mmx_memcpy(to, from, len);
|
|
}
|
|
|
|
#define memcpy(t, f, n) \
|
|
(__builtin_constant_p((n)) \
|
|
? __constant_memcpy3d((t), (f), (n)) \
|
|
: __memcpy3d((t), (f), (n)))
|
|
|
|
#else
|
|
|
|
/*
|
|
* No 3D Now!
|
|
*/
|
|
|
|
#ifndef CONFIG_KMEMCHECK
|
|
|
|
#if (__GNUC__ >= 4)
|
|
#define memcpy(t, f, n) __builtin_memcpy(t, f, n)
|
|
#else
|
|
#define memcpy(t, f, n) \
|
|
(__builtin_constant_p((n)) \
|
|
? __constant_memcpy((t), (f), (n)) \
|
|
: __memcpy((t), (f), (n)))
|
|
#endif
|
|
#else
|
|
/*
|
|
* kmemcheck becomes very happy if we use the REP instructions unconditionally,
|
|
* because it means that we know both memory operands in advance.
|
|
*/
|
|
#define memcpy(t, f, n) __memcpy((t), (f), (n))
|
|
#endif
|
|
|
|
#endif
|
|
#endif /* !CONFIG_FORTIFY_SOURCE */
|
|
|
|
#define __HAVE_ARCH_MEMMOVE
|
|
void *memmove(void *dest, const void *src, size_t n);
|
|
|
|
extern int memcmp(const void *, const void *, size_t);
|
|
#ifndef CONFIG_FORTIFY_SOURCE
|
|
#define memcmp __builtin_memcmp
|
|
#endif
|
|
|
|
#define __HAVE_ARCH_MEMCHR
|
|
extern void *memchr(const void *cs, int c, size_t count);
|
|
|
|
static inline void *__memset_generic(void *s, char c, size_t count)
|
|
{
|
|
int d0, d1;
|
|
asm volatile("rep\n\t"
|
|
"stosb"
|
|
: "=&c" (d0), "=&D" (d1)
|
|
: "a" (c), "1" (s), "0" (count)
|
|
: "memory");
|
|
return s;
|
|
}
|
|
|
|
/* we might want to write optimized versions of these later */
|
|
#define __constant_count_memset(s, c, count) __memset_generic((s), (c), (count))
|
|
|
|
/*
|
|
* memset(x, 0, y) is a reasonably common thing to do, so we want to fill
|
|
* things 32 bits at a time even when we don't know the size of the
|
|
* area at compile-time..
|
|
*/
|
|
static __always_inline
|
|
void *__constant_c_memset(void *s, unsigned long c, size_t count)
|
|
{
|
|
int d0, d1;
|
|
asm volatile("rep ; stosl\n\t"
|
|
"testb $2,%b3\n\t"
|
|
"je 1f\n\t"
|
|
"stosw\n"
|
|
"1:\ttestb $1,%b3\n\t"
|
|
"je 2f\n\t"
|
|
"stosb\n"
|
|
"2:"
|
|
: "=&c" (d0), "=&D" (d1)
|
|
: "a" (c), "q" (count), "0" (count/4), "1" ((long)s)
|
|
: "memory");
|
|
return s;
|
|
}
|
|
|
|
/* Added by Gertjan van Wingerde to make minix and sysv module work */
|
|
#define __HAVE_ARCH_STRNLEN
|
|
extern size_t strnlen(const char *s, size_t count);
|
|
/* end of additional stuff */
|
|
|
|
#define __HAVE_ARCH_STRSTR
|
|
extern char *strstr(const char *cs, const char *ct);
|
|
|
|
/*
|
|
* This looks horribly ugly, but the compiler can optimize it totally,
|
|
* as we by now know that both pattern and count is constant..
|
|
*/
|
|
static __always_inline
|
|
void *__constant_c_and_count_memset(void *s, unsigned long pattern,
|
|
size_t count)
|
|
{
|
|
switch (count) {
|
|
case 0:
|
|
return s;
|
|
case 1:
|
|
*(unsigned char *)s = pattern & 0xff;
|
|
return s;
|
|
case 2:
|
|
*(unsigned short *)s = pattern & 0xffff;
|
|
return s;
|
|
case 3:
|
|
*(unsigned short *)s = pattern & 0xffff;
|
|
*((unsigned char *)s + 2) = pattern & 0xff;
|
|
return s;
|
|
case 4:
|
|
*(unsigned long *)s = pattern;
|
|
return s;
|
|
}
|
|
|
|
#define COMMON(x) \
|
|
asm volatile("rep ; stosl" \
|
|
x \
|
|
: "=&c" (d0), "=&D" (d1) \
|
|
: "a" (eax), "0" (count/4), "1" ((long)s) \
|
|
: "memory")
|
|
|
|
{
|
|
int d0, d1;
|
|
#if __GNUC__ == 4 && __GNUC_MINOR__ == 0
|
|
/* Workaround for broken gcc 4.0 */
|
|
register unsigned long eax asm("%eax") = pattern;
|
|
#else
|
|
unsigned long eax = pattern;
|
|
#endif
|
|
|
|
switch (count % 4) {
|
|
case 0:
|
|
COMMON("");
|
|
return s;
|
|
case 1:
|
|
COMMON("\n\tstosb");
|
|
return s;
|
|
case 2:
|
|
COMMON("\n\tstosw");
|
|
return s;
|
|
default:
|
|
COMMON("\n\tstosw\n\tstosb");
|
|
return s;
|
|
}
|
|
}
|
|
|
|
#undef COMMON
|
|
}
|
|
|
|
#define __constant_c_x_memset(s, c, count) \
|
|
(__builtin_constant_p(count) \
|
|
? __constant_c_and_count_memset((s), (c), (count)) \
|
|
: __constant_c_memset((s), (c), (count)))
|
|
|
|
#define __memset(s, c, count) \
|
|
(__builtin_constant_p(count) \
|
|
? __constant_count_memset((s), (c), (count)) \
|
|
: __memset_generic((s), (c), (count)))
|
|
|
|
#define __HAVE_ARCH_MEMSET
|
|
extern void *memset(void *, int, size_t);
|
|
#ifndef CONFIG_FORTIFY_SOURCE
|
|
#if (__GNUC__ >= 4)
|
|
#define memset(s, c, count) __builtin_memset(s, c, count)
|
|
#else
|
|
#define memset(s, c, count) \
|
|
(__builtin_constant_p(c) \
|
|
? __constant_c_x_memset((s), (0x01010101UL * (unsigned char)(c)), \
|
|
(count)) \
|
|
: __memset((s), (c), (count)))
|
|
#endif
|
|
#endif /* !CONFIG_FORTIFY_SOURCE */
|
|
|
|
#define __HAVE_ARCH_MEMSET16
|
|
static inline void *memset16(uint16_t *s, uint16_t v, size_t n)
|
|
{
|
|
int d0, d1;
|
|
asm volatile("rep\n\t"
|
|
"stosw"
|
|
: "=&c" (d0), "=&D" (d1)
|
|
: "a" (v), "1" (s), "0" (n)
|
|
: "memory");
|
|
return s;
|
|
}
|
|
|
|
#define __HAVE_ARCH_MEMSET32
|
|
static inline void *memset32(uint32_t *s, uint32_t v, size_t n)
|
|
{
|
|
int d0, d1;
|
|
asm volatile("rep\n\t"
|
|
"stosl"
|
|
: "=&c" (d0), "=&D" (d1)
|
|
: "a" (v), "1" (s), "0" (n)
|
|
: "memory");
|
|
return s;
|
|
}
|
|
|
|
/*
|
|
* find the first occurrence of byte 'c', or 1 past the area if none
|
|
*/
|
|
#define __HAVE_ARCH_MEMSCAN
|
|
extern void *memscan(void *addr, int c, size_t size);
|
|
|
|
#endif /* __KERNEL__ */
|
|
|
|
#endif /* _ASM_X86_STRING_32_H */
|