fncpy.h File Reference

#include <linux/types.h>
#include <linux/string.h>
#include <asm/bug.h>
#include <asm/cacheflush.h>

Go to the source code of this file.

Macros
#define	FNCPY_ALIGN   8
#define	fncpy(dest_buf, funcp, size)

Macro Definition Documentation

#define fncpy	(		dest_buf,
			funcp,
			size
	)

Value:

({                  \
	uintptr_t __funcp_address;                 \
    typeof(funcp) __result;                     \
                                    \
    asm("" : "=r" (__funcp_address) : "0" (funcp));         \
                                    \
    /*                              \
     * Ensure alignment of source and destination addresses,    \
     * disregarding the function's Thumb bit:           \
     */                             \
    BUG_ON((uintptr_t)(dest_buf) & (FNCPY_ALIGN - 1) ||     \
        (__funcp_address & ~(uintptr_t)1 & (FNCPY_ALIGN - 1))); \
                                    \
    memcpy(dest_buf, (void const *)(__funcp_address & ~1), size);   \
    flush_icache_range((unsigned long)(dest_buf),           \
        (unsigned long)(dest_buf) + (size));            \
                                    \
    asm("" : "=r" (__result)                    \
        : "0" ((uintptr_t)(dest_buf) | (__funcp_address & 1))); \
                                    \
    __result;                           \
})

Definition at line 71 of file fncpy.h.

#define FNCPY_ALIGN   8

Definition at line 69 of file fncpy.h.