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Diffstat (limited to 'arch/um/include/um_uaccess.h')
-rw-r--r-- | arch/um/include/um_uaccess.h | 125 |
1 files changed, 125 insertions, 0 deletions
diff --git a/arch/um/include/um_uaccess.h b/arch/um/include/um_uaccess.h new file mode 100644 index 000000000000..6e348cb6de24 --- /dev/null +++ b/arch/um/include/um_uaccess.h @@ -0,0 +1,125 @@ +/* + * Copyright (C) 2002 Jeff Dike (jdike@karaya.com) + * Licensed under the GPL + */ + +#ifndef __ARCH_UM_UACCESS_H +#define __ARCH_UM_UACCESS_H + +#include "linux/config.h" +#include "choose-mode.h" + +#ifdef CONFIG_MODE_TT +#include "uaccess-tt.h" +#endif + +#ifdef CONFIG_MODE_SKAS +#include "uaccess-skas.h" +#endif + +#define access_ok(type, addr, size) \ + CHOOSE_MODE_PROC(access_ok_tt, access_ok_skas, type, addr, size) + +/* this function will go away soon - use access_ok() instead */ +static inline int __deprecated verify_area(int type, const void __user *addr, unsigned long size) +{ + return (CHOOSE_MODE_PROC(verify_area_tt, verify_area_skas, type, addr, + size)); +} + +static inline int copy_from_user(void *to, const void __user *from, int n) +{ + return(CHOOSE_MODE_PROC(copy_from_user_tt, copy_from_user_skas, to, + from, n)); +} + +static inline int copy_to_user(void __user *to, const void *from, int n) +{ + return(CHOOSE_MODE_PROC(copy_to_user_tt, copy_to_user_skas, to, + from, n)); +} + +/* + * strncpy_from_user: - Copy a NUL terminated string from userspace. + * @dst: Destination address, in kernel space. This buffer must be at + * least @count bytes long. + * @src: Source address, in user space. + * @count: Maximum number of bytes to copy, including the trailing NUL. + * + * Copies a NUL-terminated string from userspace to kernel space. + * + * On success, returns the length of the string (not including the trailing + * NUL). + * + * If access to userspace fails, returns -EFAULT (some data may have been + * copied). + * + * If @count is smaller than the length of the string, copies @count bytes + * and returns @count. + */ + +static inline int strncpy_from_user(char *dst, const char __user *src, int count) +{ + return(CHOOSE_MODE_PROC(strncpy_from_user_tt, strncpy_from_user_skas, + dst, src, count)); +} + +/* + * __clear_user: - Zero a block of memory in user space, with less checking. + * @to: Destination address, in user space. + * @n: Number of bytes to zero. + * + * Zero a block of memory in user space. Caller must check + * the specified block with access_ok() before calling this function. + * + * Returns number of bytes that could not be cleared. + * On success, this will be zero. + */ +static inline int __clear_user(void *mem, int len) +{ + return(CHOOSE_MODE_PROC(__clear_user_tt, __clear_user_skas, mem, len)); +} + +/* + * clear_user: - Zero a block of memory in user space. + * @to: Destination address, in user space. + * @n: Number of bytes to zero. + * + * Zero a block of memory in user space. + * + * Returns number of bytes that could not be cleared. + * On success, this will be zero. + */ +static inline int clear_user(void __user *mem, int len) +{ + return(CHOOSE_MODE_PROC(clear_user_tt, clear_user_skas, mem, len)); +} + +/* + * strlen_user: - Get the size of a string in user space. + * @str: The string to measure. + * @n: The maximum valid length + * + * 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 the string is too long, returns a value greater than @n. + */ +static inline int strnlen_user(const void __user *str, long len) +{ + return(CHOOSE_MODE_PROC(strnlen_user_tt, strnlen_user_skas, str, len)); +} + +#endif + +/* + * Overrides for Emacs so that we follow Linus's tabbing style. + * Emacs will notice this stuff at the end of the file and automatically + * adjust the settings for this buffer only. This must remain at the end + * of the file. + * --------------------------------------------------------------------------- + * Local variables: + * c-file-style: "linux" + * End: + */ |