278 lines
7.1 KiB
C
278 lines
7.1 KiB
C
/*
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* Copyright 2004-2009 Analog Devices Inc.
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*
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* Licensed under the GPL-2 or later.
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*
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* Based on: include/asm-m68knommu/uaccess.h
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*/
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#ifndef __BLACKFIN_UACCESS_H
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#define __BLACKFIN_UACCESS_H
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/*
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* User space memory access functions
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*/
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#include <linux/sched.h>
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#include <linux/mm.h>
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#include <linux/string.h>
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#include <asm/segment.h>
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#include <asm/sections.h>
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#define get_ds() (KERNEL_DS)
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#define get_fs() (current_thread_info()->addr_limit)
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static inline void set_fs(mm_segment_t fs)
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{
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current_thread_info()->addr_limit = fs;
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}
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#define segment_eq(a, b) ((a) == (b))
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#define VERIFY_READ 0
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#define VERIFY_WRITE 1
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#define access_ok(type, addr, size) _access_ok((unsigned long)(addr), (size))
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/*
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* The fs value determines whether argument validity checking should be
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* performed or not. If get_fs() == USER_DS, checking is performed, with
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* get_fs() == KERNEL_DS, checking is bypassed.
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*/
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#ifndef CONFIG_ACCESS_CHECK
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static inline int _access_ok(unsigned long addr, unsigned long size) { return 1; }
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#else
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extern int _access_ok(unsigned long addr, unsigned long size);
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#endif
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/*
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* The exception table consists of pairs of addresses: the first is the
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* address of an instruction that is allowed to fault, and the second is
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* the address at which the program should continue. No registers are
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* modified, so it is entirely up to the continuation code to figure out
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* what to do.
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*
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* All the routines below use bits of fixup code that are out of line
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* with the main instruction path. This means when everything is well,
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* we don't even have to jump over them. Further, they do not intrude
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* on our cache or tlb entries.
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*/
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struct exception_table_entry {
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unsigned long insn, fixup;
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};
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/*
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* These are the main single-value transfer routines. They automatically
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* use the right size if we just have the right pointer type.
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*/
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#define put_user(x, p) \
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({ \
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int _err = 0; \
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typeof(*(p)) _x = (x); \
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typeof(*(p)) __user *_p = (p); \
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if (!access_ok(VERIFY_WRITE, _p, sizeof(*(_p)))) {\
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_err = -EFAULT; \
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} \
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else { \
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switch (sizeof (*(_p))) { \
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case 1: \
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__put_user_asm(_x, _p, B); \
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break; \
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case 2: \
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__put_user_asm(_x, _p, W); \
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break; \
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case 4: \
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__put_user_asm(_x, _p, ); \
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break; \
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case 8: { \
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long _xl, _xh; \
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_xl = ((__force long *)&_x)[0]; \
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_xh = ((__force long *)&_x)[1]; \
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__put_user_asm(_xl, ((__force long __user *)_p)+0, );\
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__put_user_asm(_xh, ((__force long __user *)_p)+1, );\
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} break; \
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default: \
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_err = __put_user_bad(); \
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break; \
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} \
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} \
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_err; \
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})
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#define __put_user(x, p) put_user(x, p)
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static inline int bad_user_access_length(void)
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{
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panic("bad_user_access_length");
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return -1;
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}
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#define __put_user_bad() (printk(KERN_INFO "put_user_bad %s:%d %s\n",\
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__FILE__, __LINE__, __func__),\
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bad_user_access_length(), (-EFAULT))
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/*
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* Tell gcc we read from memory instead of writing: this is because
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* we do not write to any memory gcc knows about, so there are no
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* aliasing issues.
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*/
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#define __ptr(x) ((unsigned long __force *)(x))
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#define __put_user_asm(x, p, bhw) \
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__asm__ (#bhw"[%1] = %0;\n\t" \
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: /* no outputs */ \
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:"d" (x), "a" (__ptr(p)) : "memory")
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#define get_user(x, ptr) \
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({ \
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int _err = 0; \
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unsigned long _val = 0; \
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const typeof(*(ptr)) __user *_p = (ptr); \
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const size_t ptr_size = sizeof(*(_p)); \
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if (likely(access_ok(VERIFY_READ, _p, ptr_size))) { \
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BUILD_BUG_ON(ptr_size >= 8); \
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switch (ptr_size) { \
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case 1: \
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__get_user_asm(_val, _p, B, (Z)); \
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break; \
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case 2: \
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__get_user_asm(_val, _p, W, (Z)); \
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break; \
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case 4: \
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__get_user_asm(_val, _p, , ); \
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break; \
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} \
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} else \
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_err = -EFAULT; \
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x = (__force typeof(*(ptr)))_val; \
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_err; \
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})
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#define __get_user(x, p) get_user(x, p)
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#define __get_user_bad() (bad_user_access_length(), (-EFAULT))
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#define __get_user_asm(x, ptr, bhw, option) \
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({ \
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__asm__ __volatile__ ( \
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"%0 =" #bhw "[%1]" #option ";" \
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: "=d" (x) \
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: "a" (__ptr(ptr))); \
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})
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#define __copy_to_user_inatomic __copy_to_user
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#define __copy_from_user_inatomic __copy_from_user
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static inline unsigned long __must_check
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__copy_from_user(void *to, const void __user *from, unsigned long n)
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{
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memcpy(to, (const void __force *)from, n);
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return 0;
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}
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static inline unsigned long __must_check
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__copy_to_user(void __user *to, const void *from, unsigned long n)
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{
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memcpy((void __force *)to, from, n);
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SSYNC();
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return 0;
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}
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static inline unsigned long __must_check
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copy_from_user(void *to, const void __user *from, unsigned long n)
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{
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if (likely(access_ok(VERIFY_READ, from, n)))
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return __copy_from_user(to, from, n);
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memset(to, 0, n);
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return n;
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}
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static inline unsigned long __must_check
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copy_to_user(void __user *to, const void *from, unsigned long n)
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{
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if (likely(access_ok(VERIFY_WRITE, to, n)))
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return __copy_to_user(to, from, n);
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return n;
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}
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/*
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* Copy a null terminated string from userspace.
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*/
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static inline long __must_check
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strncpy_from_user(char *dst, const char __user *src, long count)
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{
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char *tmp;
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if (!access_ok(VERIFY_READ, src, 1))
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return -EFAULT;
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strncpy(dst, (const char __force *)src, count);
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for (tmp = dst; *tmp && count > 0; tmp++, count--) ;
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return (tmp - dst);
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}
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/*
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* Get the size of a string in user space.
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* src: The string to measure
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* n: The maximum valid length
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*
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* Get the size of a NUL-terminated string in user space.
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*
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* Returns the size of the string INCLUDING the terminating NUL.
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* On exception, returns 0.
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* If the string is too long, returns a value greater than n.
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*/
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static inline long __must_check strnlen_user(const char __user *src, long n)
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{
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if (!access_ok(VERIFY_READ, src, 1))
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return 0;
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return strnlen((const char __force *)src, n) + 1;
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}
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static inline long __must_check strlen_user(const char __user *src)
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{
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if (!access_ok(VERIFY_READ, src, 1))
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return 0;
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return strlen((const char __force *)src) + 1;
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}
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/*
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* Zero Userspace
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*/
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static inline unsigned long __must_check
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__clear_user(void __user *to, unsigned long n)
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{
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if (!access_ok(VERIFY_WRITE, to, n))
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return n;
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memset((void __force *)to, 0, n);
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return 0;
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}
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#define clear_user(to, n) __clear_user(to, n)
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/* How to interpret these return values:
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* CORE: can be accessed by core load or dma memcpy
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* CORE_ONLY: can only be accessed by core load
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* DMA: can only be accessed by dma memcpy
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* IDMA: can only be accessed by interprocessor dma memcpy (BF561)
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* ITEST: can be accessed by isram memcpy or dma memcpy
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*/
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enum {
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BFIN_MEM_ACCESS_CORE = 0,
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BFIN_MEM_ACCESS_CORE_ONLY,
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BFIN_MEM_ACCESS_DMA,
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BFIN_MEM_ACCESS_IDMA,
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BFIN_MEM_ACCESS_ITEST,
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};
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/**
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* bfin_mem_access_type() - what kind of memory access is required
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* @addr: the address to check
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* @size: number of bytes needed
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* @return: <0 is error, >=0 is BFIN_MEM_ACCESS_xxx enum (see above)
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*/
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int bfin_mem_access_type(unsigned long addr, unsigned long size);
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#endif /* _BLACKFIN_UACCESS_H */
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