aboutsummaryrefslogtreecommitdiff
path: root/include/asm-s390/uaccess.h
diff options
context:
space:
mode:
Diffstat (limited to 'include/asm-s390/uaccess.h')
-rw-r--r--include/asm-s390/uaccess.h363
1 files changed, 0 insertions, 363 deletions
diff --git a/include/asm-s390/uaccess.h b/include/asm-s390/uaccess.h
deleted file mode 100644
index 0235970278f..00000000000
--- a/include/asm-s390/uaccess.h
+++ /dev/null
@@ -1,363 +0,0 @@
-/*
- * include/asm-s390/uaccess.h
- *
- * S390 version
- * Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
- * Author(s): Hartmut Penner (hp@de.ibm.com),
- * Martin Schwidefsky (schwidefsky@de.ibm.com)
- *
- * Derived from "include/asm-i386/uaccess.h"
- */
-#ifndef __S390_UACCESS_H
-#define __S390_UACCESS_H
-
-/*
- * User space memory access functions
- */
-#include <linux/sched.h>
-#include <linux/errno.h>
-
-#define VERIFY_READ 0
-#define VERIFY_WRITE 1
-
-
-/*
- * 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.
- */
-
-#define MAKE_MM_SEG(a) ((mm_segment_t) { (a) })
-
-
-#define KERNEL_DS MAKE_MM_SEG(0)
-#define USER_DS MAKE_MM_SEG(1)
-
-#define get_ds() (KERNEL_DS)
-#define get_fs() (current->thread.mm_segment)
-
-#define set_fs(x) \
-({ \
- unsigned long __pto; \
- current->thread.mm_segment = (x); \
- __pto = current->thread.mm_segment.ar4 ? \
- S390_lowcore.user_asce : S390_lowcore.kernel_asce; \
- __ctl_load(__pto, 7, 7); \
-})
-
-#define segment_eq(a,b) ((a).ar4 == (b).ar4)
-
-
-static inline int __access_ok(const void __user *addr, unsigned long size)
-{
- return 1;
-}
-#define access_ok(type,addr,size) __access_ok(addr,size)
-
-/*
- * The exception table consists of pairs of addresses: the first is the
- * address of an instruction that is allowed to fault, and the second is
- * the address at which the program should continue. No registers are
- * modified, so it is entirely up to the continuation code to figure out
- * what to do.
- *
- * All the routines below use bits of fixup code that are out of line
- * with the main instruction path. This means when everything is well,
- * we don't even have to jump over them. Further, they do not intrude
- * on our cache or tlb entries.
- */
-
-struct exception_table_entry
-{
- unsigned long insn, fixup;
-};
-
-struct uaccess_ops {
- size_t (*copy_from_user)(size_t, const void __user *, void *);
- size_t (*copy_from_user_small)(size_t, const void __user *, void *);
- size_t (*copy_to_user)(size_t, void __user *, const void *);
- size_t (*copy_to_user_small)(size_t, void __user *, const void *);
- size_t (*copy_in_user)(size_t, void __user *, const void __user *);
- size_t (*clear_user)(size_t, void __user *);
- size_t (*strnlen_user)(size_t, const char __user *);
- size_t (*strncpy_from_user)(size_t, const char __user *, char *);
- int (*futex_atomic_op)(int op, int __user *, int oparg, int *old);
- int (*futex_atomic_cmpxchg)(int __user *, int old, int new);
-};
-
-extern struct uaccess_ops uaccess;
-extern struct uaccess_ops uaccess_std;
-extern struct uaccess_ops uaccess_mvcos;
-extern struct uaccess_ops uaccess_mvcos_switch;
-extern struct uaccess_ops uaccess_pt;
-
-static inline int __put_user_fn(size_t size, void __user *ptr, void *x)
-{
- size = uaccess.copy_to_user_small(size, ptr, x);
- return size ? -EFAULT : size;
-}
-
-static inline int __get_user_fn(size_t size, const void __user *ptr, void *x)
-{
- size = uaccess.copy_from_user_small(size, ptr, x);
- return size ? -EFAULT : size;
-}
-
-/*
- * These are the main single-value transfer routines. They automatically
- * use the right size if we just have the right pointer type.
- */
-#define __put_user(x, ptr) \
-({ \
- __typeof__(*(ptr)) __x = (x); \
- int __pu_err = -EFAULT; \
- __chk_user_ptr(ptr); \
- switch (sizeof (*(ptr))) { \
- case 1: \
- case 2: \
- case 4: \
- case 8: \
- __pu_err = __put_user_fn(sizeof (*(ptr)), \
- ptr, &__x); \
- break; \
- default: \
- __put_user_bad(); \
- break; \
- } \
- __pu_err; \
-})
-
-#define put_user(x, ptr) \
-({ \
- might_sleep(); \
- __put_user(x, ptr); \
-})
-
-
-extern int __put_user_bad(void) __attribute__((noreturn));
-
-#define __get_user(x, ptr) \
-({ \
- int __gu_err = -EFAULT; \
- __chk_user_ptr(ptr); \
- switch (sizeof(*(ptr))) { \
- case 1: { \
- unsigned char __x; \
- __gu_err = __get_user_fn(sizeof (*(ptr)), \
- ptr, &__x); \
- (x) = *(__force __typeof__(*(ptr)) *) &__x; \
- break; \
- }; \
- case 2: { \
- unsigned short __x; \
- __gu_err = __get_user_fn(sizeof (*(ptr)), \
- ptr, &__x); \
- (x) = *(__force __typeof__(*(ptr)) *) &__x; \
- break; \
- }; \
- case 4: { \
- unsigned int __x; \
- __gu_err = __get_user_fn(sizeof (*(ptr)), \
- ptr, &__x); \
- (x) = *(__force __typeof__(*(ptr)) *) &__x; \
- break; \
- }; \
- case 8: { \
- unsigned long long __x; \
- __gu_err = __get_user_fn(sizeof (*(ptr)), \
- ptr, &__x); \
- (x) = *(__force __typeof__(*(ptr)) *) &__x; \
- break; \
- }; \
- default: \
- __get_user_bad(); \
- break; \
- } \
- __gu_err; \
-})
-
-#define get_user(x, ptr) \
-({ \
- might_sleep(); \
- __get_user(x, ptr); \
-})
-
-extern int __get_user_bad(void) __attribute__((noreturn));
-
-#define __put_user_unaligned __put_user
-#define __get_user_unaligned __get_user
-
-/**
- * __copy_to_user: - Copy a block of data into user space, with less checking.
- * @to: Destination address, in user space.
- * @from: Source address, in kernel space.
- * @n: Number of bytes to copy.
- *
- * Context: User context only. This function may sleep.
- *
- * Copy data from kernel space to user space. Caller must check
- * the specified block with access_ok() before calling this function.
- *
- * Returns number of bytes that could not be copied.
- * On success, this will be zero.
- */
-static inline unsigned long __must_check
-__copy_to_user(void __user *to, const void *from, unsigned long n)
-{
- if (__builtin_constant_p(n) && (n <= 256))
- return uaccess.copy_to_user_small(n, to, from);
- else
- return uaccess.copy_to_user(n, to, from);
-}
-
-#define __copy_to_user_inatomic __copy_to_user
-#define __copy_from_user_inatomic __copy_from_user
-
-/**
- * copy_to_user: - Copy a block of data into user space.
- * @to: Destination address, in user space.
- * @from: Source address, in kernel space.
- * @n: Number of bytes to copy.
- *
- * Context: User context only. This function may sleep.
- *
- * Copy data from kernel space to user space.
- *
- * Returns number of bytes that could not be copied.
- * On success, this will be zero.
- */
-static inline unsigned long __must_check
-copy_to_user(void __user *to, const void *from, unsigned long n)
-{
- might_sleep();
- if (access_ok(VERIFY_WRITE, to, n))
- n = __copy_to_user(to, from, n);
- return n;
-}
-
-/**
- * __copy_from_user: - Copy a block of data from user space, with less checking.
- * @to: Destination address, in kernel space.
- * @from: Source address, in user space.
- * @n: Number of bytes to copy.
- *
- * Context: User context only. This function may sleep.
- *
- * Copy data from user space to kernel space. Caller must check
- * the specified block with access_ok() before calling this function.
- *
- * Returns number of bytes that could not be copied.
- * On success, this will be zero.
- *
- * If some data could not be copied, this function will pad the copied
- * data to the requested size using zero bytes.
- */
-static inline unsigned long __must_check
-__copy_from_user(void *to, const void __user *from, unsigned long n)
-{
- if (__builtin_constant_p(n) && (n <= 256))
- return uaccess.copy_from_user_small(n, from, to);
- else
- return uaccess.copy_from_user(n, from, to);
-}
-
-/**
- * copy_from_user: - Copy a block of data from user space.
- * @to: Destination address, in kernel space.
- * @from: Source address, in user space.
- * @n: Number of bytes to copy.
- *
- * Context: User context only. This function may sleep.
- *
- * Copy data from user space to kernel space.
- *
- * Returns number of bytes that could not be copied.
- * On success, this will be zero.
- *
- * If some data could not be copied, this function will pad the copied
- * data to the requested size using zero bytes.
- */
-static inline unsigned long __must_check
-copy_from_user(void *to, const void __user *from, unsigned long n)
-{
- might_sleep();
- if (access_ok(VERIFY_READ, from, n))
- n = __copy_from_user(to, from, n);
- else
- memset(to, 0, n);
- return n;
-}
-
-static inline unsigned long __must_check
-__copy_in_user(void __user *to, const void __user *from, unsigned long n)
-{
- return uaccess.copy_in_user(n, to, from);
-}
-
-static inline unsigned long __must_check
-copy_in_user(void __user *to, const void __user *from, unsigned long n)
-{
- might_sleep();
- if (__access_ok(from,n) && __access_ok(to,n))
- n = __copy_in_user(to, from, n);
- return n;
-}
-
-/*
- * Copy a null terminated string from userspace.
- */
-static inline long __must_check
-strncpy_from_user(char *dst, const char __user *src, long count)
-{
- long res = -EFAULT;
- might_sleep();
- if (access_ok(VERIFY_READ, src, 1))
- res = uaccess.strncpy_from_user(count, src, dst);
- return res;
-}
-
-static inline unsigned long
-strnlen_user(const char __user * src, unsigned long n)
-{
- might_sleep();
- return uaccess.strnlen_user(n, src);
-}
-
-/**
- * strlen_user: - Get the size of a string in user space.
- * @str: The string to measure.
- *
- * Context: User context only. This function may sleep.
- *
- * Get the size of a NUL-terminated string in user space.
- *
- * Returns the size of the string INCLUDING the terminating NUL.
- * On exception, returns 0.
- *
- * If there is a limit on the length of a valid string, you may wish to
- * consider using strnlen_user() instead.
- */
-#define strlen_user(str) strnlen_user(str, ~0UL)
-
-/*
- * Zero Userspace
- */
-
-static inline unsigned long __must_check
-__clear_user(void __user *to, unsigned long n)
-{
- return uaccess.clear_user(n, to);
-}
-
-static inline unsigned long __must_check
-clear_user(void __user *to, unsigned long n)
-{
- might_sleep();
- if (access_ok(VERIFY_WRITE, to, n))
- n = uaccess.clear_user(n, to);
- return n;
-}
-
-#endif /* __S390_UACCESS_H */
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-18 04:59:40 +0000