FM / asm

/usr/src/linux-headers-5.15.0-181/arch/microblaze/include/asm/

/usr/src/linux-headers-5.15.0-181/arch/microblaze/include/asm

Name	Size	Mode	Actions
asm-compat.h	518	0644	edit dl rm
asm-offsets.h	35	0644	edit dl rm
barrier.h	313	0644	edit dl rm
cache.h	510	0644	edit dl rm
cacheflush.h	3209	0644	edit dl rm
checksum.h	806	0644	edit dl rm
cpuinfo.h	2043	0644	edit dl rm
current.h	714	0644	edit dl rm
delay.h	2138	0644	edit dl rm
dma.h	432	0644	edit dl rm
elf.h	602	0644	edit dl rm
entry.h	1018	0644	edit dl rm
exceptions.h	1928	0644	edit dl rm
fixmap.h	1874	0644	edit dl rm
flat.h	1982	0644	edit dl rm
ftrace.h	642	0644	edit dl rm
futex.h	2179	0644	edit dl rm
hash.h	2429	0644	edit dl rm
highmem.h	1800	0644	edit dl rm
io.h	1691	0644	edit dl rm
irq.h	376	0644	edit dl rm
irqflags.h	2529	0644	edit dl rm
Kbuild	250	0644	edit dl rm
kgdb.h	739	0644	edit dl rm
mmu.h	4050	0644	edit dl rm
mmu_context.h	72	0644	edit dl rm
mmu_context_mm.h	3893	0644	edit dl rm
module.h	704	0644	edit dl rm
page.h	4076	0644	edit dl rm
pci-bridge.h	4473	0644	edit dl rm
pci.h	1986	0644	edit dl rm
pgalloc.h	1042	0644	edit dl rm
pgtable.h	14526	0644	edit dl rm
processor.h	2693	0644	edit dl rm
ptrace.h	591	0644	edit dl rm
pvr.h	8791	0644	edit dl rm
registers.h	1508	0644	edit dl rm
seccomp.h	256	0644	edit dl rm
sections.h	501	0644	edit dl rm
setup.h	823	0644	edit dl rm
string.h	494	0644	edit dl rm
switch_to.h	493	0644	edit dl rm
syscall.h	2346	0644	edit dl rm
thread_info.h	3979	0644	edit dl rm
timex.h	266	0644	edit dl rm
tlbflush.h	1579	0644	edit dl rm
uaccess.h	8121	0644	edit dl rm
unistd.h	1051	0644	edit dl rm
unwind.h	611	0644	edit dl rm
vmalloc.h	108	0644	edit dl rm

Edit: /usr/src/linux-headers-5.15.0-181/arch/microblaze/include/asm/uaccess.h (8121B)

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu>
 * Copyright (C) 2008-2009 PetaLogix
 * Copyright (C) 2006 Atmark Techno, Inc.
 */

#ifndef _ASM_MICROBLAZE_UACCESS_H
#define _ASM_MICROBLAZE_UACCESS_H

#include <linux/kernel.h>

#include <asm/mmu.h>
#include <asm/page.h>
#include <linux/pgtable.h>
#include <asm/extable.h>
#include <linux/string.h>

/*
 * On Microblaze the fs value is actually the top of the corresponding
 * address space.
 *
 * The fs value determines whether argument validity checking should be
 * performed or not. If get_fs() == USER_DS, checking is performed, with
 * get_fs() == KERNEL_DS, checking is bypassed.
 *
 * For historical reasons, these macros are grossly misnamed.
 *
 * For non-MMU arch like Microblaze, KERNEL_DS and USER_DS is equal.
 */
# define MAKE_MM_SEG(s)       ((mm_segment_t) { (s) })

#  define KERNEL_DS	MAKE_MM_SEG(0xFFFFFFFF)
#  define USER_DS	MAKE_MM_SEG(TASK_SIZE - 1)

# define get_fs()	(current_thread_info()->addr_limit)
# define set_fs(val)	(current_thread_info()->addr_limit = (val))
# define user_addr_max() get_fs().seg

# define uaccess_kernel()	(get_fs().seg == KERNEL_DS.seg)

static inline int __access_ok(unsigned long addr, unsigned long size)
{
	unsigned long limit = user_addr_max();

return (size <= limit) && (addr <= (limit - size));
}
#define access_ok(addr, size) __access_ok((unsigned long)addr, size)

# define __FIXUP_SECTION	".section .fixup,\"ax\"\n"
# define __EX_TABLE_SECTION	".section __ex_table,\"a\"\n"

extern unsigned long __copy_tofrom_user(void __user *to,
		const void __user *from, unsigned long size);

/* Return: number of not copied bytes, i.e. 0 if OK or non-zero if fail. */
static inline unsigned long __must_check __clear_user(void __user *to,
							unsigned long n)
{
	/* normal memset with two words to __ex_table */
	__asm__ __volatile__ (				\
			"1:	sb	r0, %1, r0;"	\
			"	addik	%0, %0, -1;"	\
			"	bneid	%0, 1b;"	\
			"	addik	%1, %1, 1;"	\
			"2:			"	\
			__EX_TABLE_SECTION		\
			".word	1b,2b;"			\
			".previous;"			\
		: "=r"(n), "=r"(to)			\
		: "0"(n), "1"(to)
	);
	return n;
}

static inline unsigned long __must_check clear_user(void __user *to,
							unsigned long n)
{
	might_fault();
	if (unlikely(!access_ok(to, n)))
		return n;

return __clear_user(to, n);
}

/* put_user and get_user macros */
extern long __user_bad(void);

#define __get_user_asm(insn, __gu_ptr, __gu_val, __gu_err)	\
({								\
	__asm__ __volatile__ (					\
			"1:"	insn	" %1, %2, r0;"		\
			"	addk	%0, r0, r0;"		\
			"2:			"		\
			__FIXUP_SECTION				\
			"3:	brid	2b;"			\
			"	addik	%0, r0, %3;"		\
			".previous;"				\
			__EX_TABLE_SECTION			\
			".word	1b,3b;"				\
			".previous;"				\
		: "=&r"(__gu_err), "=r"(__gu_val)		\
		: "r"(__gu_ptr), "i"(-EFAULT)			\
	);							\
})

/**
 * get_user: - Get a simple variable from user space.
 * @x:   Variable to store result.
 * @ptr: Source address, in user space.
 *
 * Context: User context only. This function may sleep if pagefaults are
 *          enabled.
 *
 * This macro copies a single simple variable from user space to kernel
 * space.  It supports simple types like char and int, but not larger
 * data types like structures or arrays.
 *
 * @ptr must have pointer-to-simple-variable type, and the result of
 * dereferencing @ptr must be assignable to @x without a cast.
 *
 * Returns zero on success, or -EFAULT on error.
 * On error, the variable @x is set to zero.
 */
#define get_user(x, ptr) ({				\
	const typeof(*(ptr)) __user *__gu_ptr = (ptr);	\
	access_ok(__gu_ptr, sizeof(*__gu_ptr)) ?	\
		__get_user(x, __gu_ptr) : -EFAULT;	\
})

#define __get_user(x, ptr)						\
({									\
	long __gu_err;							\
	switch (sizeof(*(ptr))) {					\
	case 1:								\
		__get_user_asm("lbu", (ptr), x, __gu_err);		\
		break;							\
	case 2:								\
		__get_user_asm("lhu", (ptr), x, __gu_err);		\
		break;							\
	case 4:								\
		__get_user_asm("lw", (ptr), x, __gu_err);		\
		break;							\
	case 8: {							\
		__u64 __x = 0;						\
		__gu_err = raw_copy_from_user(&__x, ptr, 8) ?		\
							-EFAULT : 0;	\
		(x) = (typeof(x))(typeof((x) - (x)))__x;		\
		break;							\
	}								\
	default:							\
		/* __gu_val = 0; __gu_err = -EINVAL;*/ __gu_err = __user_bad();\
	}								\
	__gu_err;							\
})

#define __put_user_asm(insn, __gu_ptr, __gu_val, __gu_err)	\
({								\
	__asm__ __volatile__ (					\
			"1:"	insn	" %1, %2, r0;"		\
			"	addk	%0, r0, r0;"		\
			"2:			"		\
			__FIXUP_SECTION				\
			"3:	brid	2b;"			\
			"	addik	%0, r0, %3;"		\
			".previous;"				\
			__EX_TABLE_SECTION			\
			".word	1b,3b;"				\
			".previous;"				\
		: "=&r"(__gu_err)				\
		: "r"(__gu_val), "r"(__gu_ptr), "i"(-EFAULT)	\
	);							\
})

#define __put_user_asm_8(__gu_ptr, __gu_val, __gu_err)		\
({								\
	__asm__ __volatile__ ("	lwi	%0, %1, 0;"		\
			"1:	swi	%0, %2, 0;"		\
			"	lwi	%0, %1, 4;"		\
			"2:	swi	%0, %2, 4;"		\
			"	addk	%0, r0, r0;"		\
			"3:			"		\
			__FIXUP_SECTION				\
			"4:	brid	3b;"			\
			"	addik	%0, r0, %3;"		\
			".previous;"				\
			__EX_TABLE_SECTION			\
			".word	1b,4b,2b,4b;"			\
			".previous;"				\
		: "=&r"(__gu_err)				\
		: "r"(&__gu_val), "r"(__gu_ptr), "i"(-EFAULT)	\
		);						\
})

/**
 * put_user: - Write a simple value into user space.
 * @x:   Value to copy to user space.
 * @ptr: Destination address, in user space.
 *
 * Context: User context only. This function may sleep if pagefaults are
 *          enabled.
 *
 * This macro copies a single simple value from kernel space to user
 * space.  It supports simple types like char and int, but not larger
 * data types like structures or arrays.
 *
 * @ptr must have pointer-to-simple-variable type, and @x must be assignable
 * to the result of dereferencing @ptr.
 *
 * Returns zero on success, or -EFAULT on error.
 */
#define put_user(x, ptr)						\
	__put_user_check((x), (ptr), sizeof(*(ptr)))

#define __put_user_check(x, ptr, size)					\
({									\
	typeof(*(ptr)) volatile __pu_val = x;				\
	typeof(*(ptr)) __user *__pu_addr = (ptr);			\
	int __pu_err = 0;						\
									\
	if (access_ok(__pu_addr, size)) {			\
		switch (size) {						\
		case 1:							\
			__put_user_asm("sb", __pu_addr, __pu_val,	\
				       __pu_err);			\
			break;						\
		case 2:							\
			__put_user_asm("sh", __pu_addr, __pu_val,	\
				       __pu_err);			\
			break;						\
		case 4:							\
			__put_user_asm("sw", __pu_addr, __pu_val,	\
				       __pu_err);			\
			break;						\
		case 8:							\
			__put_user_asm_8(__pu_addr, __pu_val, __pu_err);\
			break;						\
		default:						\
			__pu_err = __user_bad();			\
			break;						\
		}							\
	} else {							\
		__pu_err = -EFAULT;					\
	}								\
	__pu_err;							\
})

#define __put_user(x, ptr)						\
({									\
	__typeof__(*(ptr)) volatile __gu_val = (x);			\
	long __gu_err = 0;						\
	switch (sizeof(__gu_val)) {					\
	case 1:								\
		__put_user_asm("sb", (ptr), __gu_val, __gu_err);	\
		break;							\
	case 2:								\
		__put_user_asm("sh", (ptr), __gu_val, __gu_err);	\
		break;							\
	case 4:								\
		__put_user_asm("sw", (ptr), __gu_val, __gu_err);	\
		break;							\
	case 8:								\
		__put_user_asm_8((ptr), __gu_val, __gu_err);		\
		break;							\
	default:							\
		/*__gu_err = -EINVAL;*/	__gu_err = __user_bad();	\
	}								\
	__gu_err;							\
})

static inline unsigned long
raw_copy_from_user(void *to, const void __user *from, unsigned long n)
{
	return __copy_tofrom_user((__force void __user *)to, from, n);
}

static inline unsigned long
raw_copy_to_user(void __user *to, const void *from, unsigned long n)
{
	return __copy_tofrom_user(to, (__force const void __user *)from, n);
}
#define INLINE_COPY_FROM_USER
#define INLINE_COPY_TO_USER

/*
 * Copy a null terminated string from userspace.
 */
__must_check long strncpy_from_user(char *dst, const char __user *src,
				    long count);

/*
 * Return the size of a string (including the ending 0)
 *
 * Return 0 on exception, a value greater than N if too long
 */
__must_check long strnlen_user(const char __user *sstr, long len);

#endif /* _ASM_MICROBLAZE_UACCESS_H */

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