arch/parisc/include/asm/uaccess.h

Source file repositories/reference/linux-study-clean/arch/parisc/include/asm/uaccess.h

File Facts

System
Linux kernel
Corpus path
arch/parisc/include/asm/uaccess.h
Extension
.h
Size
5376 bytes
Lines
203
Domain
Architecture Layer
Bucket
arch/parisc
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 __PARISC_UACCESS_H
#define __PARISC_UACCESS_H

/*
 * User space memory access functions
 */
#include <asm/page.h>
#include <asm/cache.h>
#include <asm/extable.h>

#include <linux/bug.h>
#include <linux/string.h>

#define TASK_SIZE_MAX DEFAULT_TASK_SIZE
#include <asm/pgtable.h>
#include <asm-generic/access_ok.h>

#define put_user __put_user
#define get_user __get_user

#if !defined(CONFIG_64BIT)
#define LDD_USER(sr, val, ptr)	__get_user_asm64(sr, val, ptr)
#define STD_USER(sr, x, ptr)	__put_user_asm64(sr, x, ptr)
#else
#define LDD_USER(sr, val, ptr)	__get_user_asm(sr, val, "ldd", ptr)
#define STD_USER(sr, x, ptr)	__put_user_asm(sr, "std", x, ptr)
#endif

#define __get_user_internal(sr, val, ptr)		\
({							\
	ASM_EXCEPTIONTABLE_VAR(__gu_err);		\
							\
	switch (sizeof(*(ptr))) {			\
	case 1: __get_user_asm(sr, val, "ldb", ptr); break; \
	case 2: __get_user_asm(sr, val, "ldh", ptr); break; \
	case 4: __get_user_asm(sr, val, "ldw", ptr); break; \
	case 8: LDD_USER(sr, val, ptr); break;		\
	default: BUILD_BUG();				\
	}						\
							\
	__gu_err;					\
})

#define __probe_user_internal(sr, error, ptr)			\
({								\
	__asm__("\tproberi (%%sr%1,%2),%3,%0\n"			\
		"\tcmpiclr,= 1,%0,%0\n"				\
		"\tldi %4,%0\n"					\
		: "=r"(error)					\
		: "i"(sr), "r"(ptr), "i"(PRIV_USER),		\
		  "i"(-EFAULT));				\
})

#define __get_user(val, ptr)					\
({								\
	register long __gu_err;					\
								\
	__gu_err = __get_user_internal(SR_USER, val, ptr);	\
	if (likely(!__gu_err))					\
		__probe_user_internal(SR_USER, __gu_err, ptr);	\
	__gu_err;						\
})

#define __get_user_asm(sr, val, ldx, ptr)		\
{							\
	register long __gu_val;				\
							\
	__asm__("1: " ldx " 0(%%sr%2,%3),%0\n"		\
		"9:\n"					\
		ASM_EXCEPTIONTABLE_ENTRY_EFAULT(1b, 9b, "%1")	\
		: "=r"(__gu_val), "+r"(__gu_err)        \
		: "i"(sr), "r"(ptr));			\
							\
	(val) = (__force __typeof__(*(ptr))) __gu_val;	\
}

#define __get_kernel_nofault(dst, src, type, err_label)	\
{							\
	type __z;					\
	long __err;					\
	__err = __get_user_internal(SR_KERNEL, __z, (type *)(src)); \
	if (unlikely(__err))				\
		goto err_label;				\
	else						\
		*(type *)(dst) = __z;			\
}


#if !defined(CONFIG_64BIT)

Annotation

Implementation Notes