arch/m68k/include/asm/string.h

Source file repositories/reference/linux-study-clean/arch/m68k/include/asm/string.h

File Facts

System
Linux kernel
Corpus path
arch/m68k/include/asm/string.h
Extension
.h
Size
958 bytes
Lines
39
Domain
Architecture Layer
Bucket
arch/m68k
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

#ifndef _M68K_STRING_H_
#define _M68K_STRING_H_

#include <linux/types.h>
#include <linux/compiler.h>

#define __HAVE_ARCH_STRNLEN
static inline size_t strnlen(const char *s, size_t count)
{
	const char *sc = s;

	asm volatile ("\n"
		"1:     subq.l  #1,%1\n"
		"       jcs     2f\n"
		"       tst.b   (%0)+\n"
		"       jne     1b\n"
		"       subq.l  #1,%0\n"
		"2:"
		: "+a" (sc), "+d" (count));
	return sc - s;
}

#define __HAVE_ARCH_MEMMOVE
extern void *memmove(void *, const void *, __kernel_size_t);

extern int memcmp(const void *, const void *, __kernel_size_t);
#define memcmp(d, s, n) __builtin_memcmp(d, s, n)

#define __HAVE_ARCH_MEMSET
extern void *memset(void *, int, __kernel_size_t);
#define memset(d, c, n) __builtin_memset(d, c, n)

#define __HAVE_ARCH_MEMCPY
extern void *memcpy(void *, const void *, __kernel_size_t);
#define memcpy(d, s, n) __builtin_memcpy(d, s, n)

#endif /* _M68K_STRING_H_ */

Annotation

Implementation Notes