arch/csky/include/asm/vdso.h

Source file repositories/reference/linux-study-clean/arch/csky/include/asm/vdso.h

File Facts

System
Linux kernel
Corpus path
arch/csky/include/asm/vdso.h
Extension
.h
Size
724 bytes
Lines
23
Domain
Architecture Layer
Bucket
arch/csky
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 __ASM_CSKY_VDSO_H
#define __ASM_CSKY_VDSO_H

#include <linux/types.h>

/*
 * The VDSO symbols are mapped into Linux so we can just use regular symbol
 * addressing to get their offsets in userspace.  The symbols are mapped at an
 * offset of 0, but since the linker must support setting weak undefined
 * symbols to the absolute address 0 it also happens to support other low
 * addresses even when the code model suggests those low addresses would not
 * otherwise be available.
 */
#define VDSO_SYMBOL(base, name)							\
({										\
	extern const char __vdso_##name[];					\
	(void __user *)((unsigned long)(base) + __vdso_##name);			\
})

#endif /* __ASM_CSKY_VDSO_H */

Annotation

Implementation Notes