FM / asm

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

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

Name	Size	Mode	Actions
asm-offsets.h	35	0644	edit dl rm
asm-uaccess.h	4180	0644	edit dl rm
asmmacro.h	4763	0644	edit dl rm
atomic.h	7301	0644	edit dl rm
barrier.h	594	0644	edit dl rm
bitops.h	5398	0644	edit dl rm
bootparam.h	1402	0644	edit dl rm
cache.h	1114	0644	edit dl rm
cacheasm.h	3856	0644	edit dl rm
cacheflush.h	5968	0644	edit dl rm
checksum.h	5893	0644	edit dl rm
cmpxchg.h	5684	0644	edit dl rm
coprocessor.h	4623	0644	edit dl rm
core.h	830	0644	edit dl rm
current.h	679	0644	edit dl rm
delay.h	1668	0644	edit dl rm
dma.h	1830	0644	edit dl rm
elf.h	5115	0644	edit dl rm
fixmap.h	1106	0644	edit dl rm
flat.h	440	0644	edit dl rm
ftrace.h	979	0644	edit dl rm
futex.h	3889	0644	edit dl rm
highmem.h	2167	0644	edit dl rm
hw_breakpoint.h	1597	0644	edit dl rm
initialize_mmu.h	5196	0644	edit dl rm
io.h	1959	0644	edit dl rm
irq.h	1127	0644	edit dl rm
irqflags.h	2069	0644	edit dl rm
jump_label.h	1655	0644	edit dl rm
kasan.h	859	0644	edit dl rm
Kbuild	230	0644	edit dl rm
kmem_layout.h	2790	0644	edit dl rm
linkage.h	154	0644	edit dl rm
mmu.h	462	0644	edit dl rm
mmu_context.h	3624	0644	edit dl rm
mxregs.h	1330	0644	edit dl rm
nommu_context.h	156	0644	edit dl rm
page.h	5793	0644	edit dl rm
pci-bridge.h	2170	0644	edit dl rm
pci.h	1302	0644	edit dl rm
perf_event.h	108	0644	edit dl rm
pgalloc.h	1405	0644	edit dl rm
pgtable.h	14470	0644	edit dl rm
platform.h	1528	0644	edit dl rm
processor.h	7705	0644	edit dl rm
ptrace.h	3321	0644	edit dl rm
regs.h	4017	0644	edit dl rm
seccomp.h	287	0644	edit dl rm
serial.h	443	0644	edit dl rm
shmparam.h	561	0644	edit dl rm
signal.h	502	0644	edit dl rm
smp.h	967	0644	edit dl rm
spinlock.h	472	0644	edit dl rm
spinlock_types.h	317	0644	edit dl rm
stackprotector.h	1140	0644	edit dl rm
stacktrace.h	1158	0644	edit dl rm
string.h	3385	0644	edit dl rm
switch_to.h	601	0644	edit dl rm
syscall.h	2140	0644	edit dl rm
sysmem.h	426	0644	edit dl rm
thread_info.h	3965	0644	edit dl rm
timex.h	1440	0644	edit dl rm
tlb.h	475	0644	edit dl rm
tlbflush.h	5620	0644	edit dl rm
traps.h	2779	0644	edit dl rm
uaccess.h	9375	0644	edit dl rm
ucontext.h	540	0644	edit dl rm
unistd.h	370	0644	edit dl rm
vectors.h	3276	0644	edit dl rm
vermagic.h	433	0644	edit dl rm
vmalloc.h	96	0644	edit dl rm

Edit: /usr/src/linux-headers-5.15.0-181/arch/xtensa/include/asm/uaccess.h (9375B)

/*
 * include/asm-xtensa/uaccess.h
 *
 * User space memory access functions
 *
 * These routines provide basic accessing functions to the user memory
 * space for the kernel. This header file provides functions such as:
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 2001 - 2005 Tensilica Inc.
 */

#ifndef _XTENSA_UACCESS_H
#define _XTENSA_UACCESS_H

#include <linux/prefetch.h>
#include <asm/types.h>
#include <asm/extable.h>

/*
 * 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 (Data Segment Register?), these macros are
 * grossly misnamed.
 */

#define KERNEL_DS	((mm_segment_t) { 0 })
#define USER_DS		((mm_segment_t) { 1 })

#define get_fs()	(current->thread.current_ds)
#define set_fs(val)	(current->thread.current_ds = (val))

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

#define __kernel_ok (uaccess_kernel())
#define __user_ok(addr, size) \
		(((size) <= TASK_SIZE)&&((addr) <= TASK_SIZE-(size)))
#define __access_ok(addr, size) (__kernel_ok || __user_ok((addr), (size)))
#define access_ok(addr, size) __access_ok((unsigned long)(addr), (size))

#define user_addr_max() (uaccess_kernel() ? ~0UL : TASK_SIZE)

/*
 * These are the main single-value transfer routines.  They
 * automatically use the right size if we just have the right pointer
 * type.
 *
 * This gets kind of ugly. We want to return _two_ values in
 * "get_user()" and yet we don't want to do any pointers, because that
 * is too much of a performance impact. Thus we have a few rather ugly
 * macros here, and hide all the uglyness from the user.
 *
 * Careful to not
 * (a) re-use the arguments for side effects (sizeof is ok)
 * (b) require any knowledge of processes at this stage
 */
#define put_user(x, ptr)	__put_user_check((x), (ptr), sizeof(*(ptr)))
#define get_user(x, ptr) __get_user_check((x), (ptr), sizeof(*(ptr)))

/*
 * The "__xxx" versions of the user access functions are versions that
 * do not verify the address space, that must have been done previously
 * with a separate "access_ok()" call (this is used when we do multiple
 * accesses to the same area of user memory).
 */
#define __put_user(x, ptr) __put_user_nocheck((x), (ptr), sizeof(*(ptr)))
#define __get_user(x, ptr) __get_user_nocheck((x), (ptr), sizeof(*(ptr)))

extern long __put_user_bad(void);

#define __put_user_nocheck(x, ptr, size)		\
({							\
	long __pu_err;					\
	__put_user_size((x), (ptr), (size), __pu_err);	\
	__pu_err;					\
})

#define __put_user_check(x, ptr, size)					\
({									\
	long __pu_err = -EFAULT;					\
	__typeof__(*(ptr)) __user *__pu_addr = (ptr);			\
	if (access_ok(__pu_addr, size))			\
		__put_user_size((x), __pu_addr, (size), __pu_err);	\
	__pu_err;							\
})

#define __put_user_size(x, ptr, size, retval)				\
do {									\
	int __cb;							\
	retval = 0;							\
	switch (size) {							\
	case 1: __put_user_asm(x, ptr, retval, 1, "s8i", __cb);  break;	\
	case 2: __put_user_asm(x, ptr, retval, 2, "s16i", __cb); break;	\
	case 4: __put_user_asm(x, ptr, retval, 4, "s32i", __cb); break;	\
	case 8: {							\
		     __typeof__(*ptr) __v64 = x;			\
		     retval = __copy_to_user(ptr, &__v64, 8) ? -EFAULT : 0;	\
		     break;						\
	        }							\
	default: __put_user_bad();					\
	}								\
} while (0)

/*
 * Consider a case of a user single load/store would cause both an
 * unaligned exception and an MMU-related exception (unaligned
 * exceptions happen first):
 *
 * User code passes a bad variable ptr to a system call.
 * Kernel tries to access the variable.
 * Unaligned exception occurs.
 * Unaligned exception handler tries to make aligned accesses.
 * Double exception occurs for MMU-related cause (e.g., page not mapped).
 * do_page_fault() thinks the fault address belongs to the kernel, not the
 * user, and panics.
 *
 * The kernel currently prohibits user unaligned accesses.  We use the
 * __check_align_* macros to check for unaligned addresses before
 * accessing user space so we don't crash the kernel.  Both
 * __put_user_asm and __get_user_asm use these alignment macros, so
 * macro-specific labels such as 0f, 1f, %0, %2, and %3 must stay in
 * sync.
 */

#define __check_align_1  ""

#define __check_align_2				\
	"   _bbci.l %[mem] * 0, 1f	\n"	\
	"   movi    %[err], %[efault]	\n"	\
	"   _j      2f			\n"

#define __check_align_4				\
	"   _bbsi.l %[mem] * 0, 0f	\n"	\
	"   _bbci.l %[mem] * 0 + 1, 1f	\n"	\
	"0: movi    %[err], %[efault]	\n"	\
	"   _j      2f			\n"

/*
 * We don't tell gcc that we are accessing memory, but this is OK
 * because we do not write to any memory gcc knows about, so there
 * are no aliasing issues.
 *
 * WARNING: If you modify this macro at all, verify that the
 * __check_align_* macros still work.
 */
#define __put_user_asm(x_, addr_, err_, align, insn, cb)\
__asm__ __volatile__(					\
	__check_align_##align				\
	"1: "insn"  %[x], %[mem]	\n"		\
	"2:				\n"		\
	"   .section  .fixup,\"ax\"	\n"		\
	"   .align 4			\n"		\
	"   .literal_position		\n"		\
	"5:				\n"		\
	"   movi   %[tmp], 2b		\n"		\
	"   movi   %[err], %[efault]	\n"		\
	"   jx     %[tmp]		\n"		\
	"   .previous			\n"		\
	"   .section  __ex_table,\"a\"	\n"		\
	"   .long	1b, 5b		\n"		\
	"   .previous"					\
	:[err] "+r"(err_), [tmp] "=r"(cb), [mem] "=m"(*(addr_))		\
	:[x] "r"(x_), [efault] "i"(-EFAULT))

#define __get_user_nocheck(x, ptr, size)			\
({								\
	long __gu_err;						\
	__get_user_size((x), (ptr), (size), __gu_err);		\
	__gu_err;						\
})

#define __get_user_check(x, ptr, size)					\
({									\
	long __gu_err = -EFAULT;					\
	const __typeof__(*(ptr)) __user *__gu_addr = (ptr);		\
	if (access_ok(__gu_addr, size))					\
		__get_user_size((x), __gu_addr, (size), __gu_err);	\
	else								\
		(x) = (__typeof__(*(ptr)))0;				\
	__gu_err;							\
})

extern long __get_user_bad(void);

#define __get_user_size(x, ptr, size, retval)				\
do {									\
	int __cb;							\
	retval = 0;							\
	switch (size) {							\
	case 1: __get_user_asm(x, ptr, retval, 1, "l8ui", __cb);  break;\
	case 2: __get_user_asm(x, ptr, retval, 2, "l16ui", __cb); break;\
	case 4: __get_user_asm(x, ptr, retval, 4, "l32i", __cb);  break;\
	case 8: {							\
		u64 __x;						\
		if (unlikely(__copy_from_user(&__x, ptr, 8))) {		\
			retval = -EFAULT;				\
			(x) = (__typeof__(*(ptr)))0;			\
		} else {						\
			(x) = *(__force __typeof__(*(ptr)) *)&__x;	\
		}							\
		break;							\
	}								\
	default:							\
		(x) = (__typeof__(*(ptr)))0;				\
		__get_user_bad();					\
	}								\
} while (0)

/*
 * WARNING: If you modify this macro at all, verify that the
 * __check_align_* macros still work.
 */
#define __get_user_asm(x_, addr_, err_, align, insn, cb) \
do {							\
	u32 __x = 0;					\
	__asm__ __volatile__(				\
		__check_align_##align			\
		"1: "insn"  %[x], %[mem]	\n"	\
		"2:				\n"	\
		"   .section  .fixup,\"ax\"	\n"	\
		"   .align 4			\n"	\
		"   .literal_position		\n"	\
		"5:				\n"	\
		"   movi   %[tmp], 2b		\n"	\
		"   movi   %[err], %[efault]	\n"	\
		"   jx     %[tmp]		\n"	\
		"   .previous			\n"	\
		"   .section  __ex_table,\"a\"	\n"	\
		"   .long	1b, 5b		\n"	\
		"   .previous"				\
		:[err] "+r"(err_), [tmp] "=r"(cb), [x] "+r"(__x) \
		:[mem] "m"(*(addr_)), [efault] "i"(-EFAULT)); \
	(x_) = (__force __typeof__(*(addr_)))__x;	\
} while (0)

/*
 * Copy to/from user space
 */

extern unsigned __xtensa_copy_user(void *to, const void *from, unsigned n);

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

/*
 * We need to return the number of bytes not cleared.  Our memset()
 * returns zero if a problem occurs while accessing user-space memory.
 * In that event, return no memory cleared.  Otherwise, zero for
 * success.
 */

static inline unsigned long
__xtensa_clear_user(void __user *addr, unsigned long size)
{
	if (!__memset((void __force *)addr, 0, size))
		return size;
	return 0;
}

static inline unsigned long
clear_user(void __user *addr, unsigned long size)
{
	if (access_ok(addr, size))
		return __xtensa_clear_user(addr, size);
	return size ? -EFAULT : 0;
}

#define __clear_user  __xtensa_clear_user

#ifdef CONFIG_ARCH_HAS_STRNCPY_FROM_USER
extern long __strncpy_user(char *dst, const char __user *src, long count);

static inline long
strncpy_from_user(char *dst, const char __user *src, long count)
{
	if (access_ok(src, 1))
		return __strncpy_user(dst, src, count);
	return -EFAULT;
}
#else
long strncpy_from_user(char *dst, const char __user *src, long count);
#endif

/*
 * Return the size of a string (including the ending 0!)
 */
extern long __strnlen_user(const char __user *str, long len);

static inline long strnlen_user(const char __user *str, long len)
{
	if (!access_ok(str, 1))
		return 0;
	return __strnlen_user(str, len);
}

#endif	/* _XTENSA_UACCESS_H */

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