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Diffstat (limited to 'arch/tile/include/asm/uaccess.h')
| -rw-r--r-- | arch/tile/include/asm/uaccess.h | 411 |
1 files changed, 0 insertions, 411 deletions
diff --git a/arch/tile/include/asm/uaccess.h b/arch/tile/include/asm/uaccess.h deleted file mode 100644 index cb4fbe7e4f88..000000000000 --- a/arch/tile/include/asm/uaccess.h +++ /dev/null @@ -1,411 +0,0 @@ -/* - * Copyright 2010 Tilera Corporation. All Rights Reserved. - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * as published by the Free Software Foundation, version 2. - * - * This program is distributed in the hope that it will be useful, but - * WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or - * NON INFRINGEMENT. See the GNU General Public License for - * more details. - */ - -#ifndef _ASM_TILE_UACCESS_H -#define _ASM_TILE_UACCESS_H - -/* - * User space memory access functions - */ -#include <linux/mm.h> -#include <asm/processor.h> -#include <asm/page.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, these macros are grossly misnamed. - */ -#define MAKE_MM_SEG(a) ((mm_segment_t) { (a) }) - -#define KERNEL_DS MAKE_MM_SEG(-1UL) -#define USER_DS MAKE_MM_SEG(PAGE_OFFSET) - -#define get_ds() (KERNEL_DS) -#define get_fs() (current_thread_info()->addr_limit) -#define set_fs(x) (current_thread_info()->addr_limit = (x)) - -#define segment_eq(a, b) ((a).seg == (b).seg) - -#ifndef __tilegx__ -/* - * We could allow mapping all 16 MB at 0xfc000000, but we set up a - * special hack in arch_setup_additional_pages() to auto-create a mapping - * for the first 16 KB, and it would seem strange to have different - * user-accessible semantics for memory at 0xfc000000 and above 0xfc004000. - */ -static inline int is_arch_mappable_range(unsigned long addr, - unsigned long size) -{ - return (addr >= MEM_USER_INTRPT && - addr < (MEM_USER_INTRPT + INTRPT_SIZE) && - size <= (MEM_USER_INTRPT + INTRPT_SIZE) - addr); -} -#define is_arch_mappable_range is_arch_mappable_range -#else -#define is_arch_mappable_range(addr, size) 0 -#endif - -/* - * Note that using this definition ignores is_arch_mappable_range(), - * so on tilepro code that uses user_addr_max() is constrained not - * to reference the tilepro user-interrupt region. - */ -#define user_addr_max() (current_thread_info()->addr_limit.seg) - -/* - * Test whether a block of memory is a valid user space address. - * Returns 0 if the range is valid, nonzero otherwise. - */ -int __range_ok(unsigned long addr, unsigned long size); - -/** - * access_ok: - Checks if a user space pointer is valid - * @type: Type of access: %VERIFY_READ or %VERIFY_WRITE. Note that - * %VERIFY_WRITE is a superset of %VERIFY_READ - if it is safe - * to write to a block, it is always safe to read from it. - * @addr: User space pointer to start of block to check - * @size: Size of block to check - * - * Context: User context only. This function may sleep if pagefaults are - * enabled. - * - * Checks if a pointer to a block of memory in user space is valid. - * - * Returns true (nonzero) if the memory block may be valid, false (zero) - * if it is definitely invalid. - * - * Note that, depending on architecture, this function probably just - * checks that the pointer is in the user space range - after calling - * this function, memory access functions may still return -EFAULT. - */ -#define access_ok(type, addr, size) ({ \ - __chk_user_ptr(addr); \ - likely(__range_ok((unsigned long)(addr), (size)) == 0); \ -}) - -#include <asm/extable.h> - -/* - * This is a type: either unsigned long, if the argument fits into - * that type, or otherwise unsigned long long. - */ -#define __inttype(x) \ - __typeof__(__builtin_choose_expr(sizeof(x) > sizeof(0UL), 0ULL, 0UL)) - -/* - * Support macros for __get_user(). - * Note that __get_user() and __put_user() assume proper alignment. - */ - -#ifdef __LP64__ -#define _ASM_PTR ".quad" -#define _ASM_ALIGN ".align 8" -#else -#define _ASM_PTR ".long" -#define _ASM_ALIGN ".align 4" -#endif - -#define __get_user_asm(OP, x, ptr, ret) \ - asm volatile("1: {" #OP " %1, %2; movei %0, 0 }\n" \ - ".pushsection .fixup,\"ax\"\n" \ - "0: { movei %1, 0; movei %0, %3 }\n" \ - "j 9f\n" \ - ".section __ex_table,\"a\"\n" \ - _ASM_ALIGN "\n" \ - _ASM_PTR " 1b, 0b\n" \ - ".popsection\n" \ - "9:" \ - : "=r" (ret), "=r" (x) \ - : "r" (ptr), "i" (-EFAULT)) - -#ifdef __tilegx__ -#define __get_user_1(x, ptr, ret) __get_user_asm(ld1u, x, ptr, ret) -#define __get_user_2(x, ptr, ret) __get_user_asm(ld2u, x, ptr, ret) -#define __get_user_4(x, ptr, ret) __get_user_asm(ld4s, x, ptr, ret) -#define __get_user_8(x, ptr, ret) __get_user_asm(ld, x, ptr, ret) -#else -#define __get_user_1(x, ptr, ret) __get_user_asm(lb_u, x, ptr, ret) -#define __get_user_2(x, ptr, ret) __get_user_asm(lh_u, x, ptr, ret) -#define __get_user_4(x, ptr, ret) __get_user_asm(lw, x, ptr, ret) -#ifdef __LITTLE_ENDIAN -#define __lo32(a, b) a -#define __hi32(a, b) b -#else -#define __lo32(a, b) b -#define __hi32(a, b) a -#endif -#define __get_user_8(x, ptr, ret) \ - ({ \ - unsigned int __a, __b; \ - asm volatile("1: { lw %1, %3; addi %2, %3, 4 }\n" \ - "2: { lw %2, %2; movei %0, 0 }\n" \ - ".pushsection .fixup,\"ax\"\n" \ - "0: { movei %1, 0; movei %2, 0 }\n" \ - "{ movei %0, %4; j 9f }\n" \ - ".section __ex_table,\"a\"\n" \ - ".align 4\n" \ - ".word 1b, 0b\n" \ - ".word 2b, 0b\n" \ - ".popsection\n" \ - "9:" \ - : "=r" (ret), "=r" (__a), "=&r" (__b) \ - : "r" (ptr), "i" (-EFAULT)); \ - (x) = (__force __typeof(x))(__inttype(x)) \ - (((u64)__hi32(__a, __b) << 32) | \ - __lo32(__a, __b)); \ - }) -#endif - -extern int __get_user_bad(void) - __attribute__((warning("sizeof __get_user argument not 1, 2, 4 or 8"))); - -/** - * __get_user: - Get a simple variable from user space, with less checking. - * @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. - * - * Caller must check the pointer with access_ok() before calling this - * function. - */ -#define __get_user(x, ptr) \ - ({ \ - int __ret; \ - typeof(x) _x; \ - __chk_user_ptr(ptr); \ - switch (sizeof(*(ptr))) { \ - case 1: __get_user_1(_x, ptr, __ret); break; \ - case 2: __get_user_2(_x, ptr, __ret); break; \ - case 4: __get_user_4(_x, ptr, __ret); break; \ - case 8: __get_user_8(_x, ptr, __ret); break; \ - default: __ret = __get_user_bad(); break; \ - } \ - (x) = (typeof(*(ptr))) _x; \ - __ret; \ - }) - -/* Support macros for __put_user(). */ - -#define __put_user_asm(OP, x, ptr, ret) \ - asm volatile("1: {" #OP " %1, %2; movei %0, 0 }\n" \ - ".pushsection .fixup,\"ax\"\n" \ - "0: { movei %0, %3; j 9f }\n" \ - ".section __ex_table,\"a\"\n" \ - _ASM_ALIGN "\n" \ - _ASM_PTR " 1b, 0b\n" \ - ".popsection\n" \ - "9:" \ - : "=r" (ret) \ - : "r" (ptr), "r" (x), "i" (-EFAULT)) - -#ifdef __tilegx__ -#define __put_user_1(x, ptr, ret) __put_user_asm(st1, x, ptr, ret) -#define __put_user_2(x, ptr, ret) __put_user_asm(st2, x, ptr, ret) -#define __put_user_4(x, ptr, ret) __put_user_asm(st4, x, ptr, ret) -#define __put_user_8(x, ptr, ret) __put_user_asm(st, x, ptr, ret) -#else -#define __put_user_1(x, ptr, ret) __put_user_asm(sb, x, ptr, ret) -#define __put_user_2(x, ptr, ret) __put_user_asm(sh, x, ptr, ret) -#define __put_user_4(x, ptr, ret) __put_user_asm(sw, x, ptr, ret) -#define __put_user_8(x, ptr, ret) \ - ({ \ - u64 __x = (__force __inttype(x))(x); \ - int __lo = (int) __x, __hi = (int) (__x >> 32); \ - asm volatile("1: { sw %1, %2; addi %0, %1, 4 }\n" \ - "2: { sw %0, %3; movei %0, 0 }\n" \ - ".pushsection .fixup,\"ax\"\n" \ - "0: { movei %0, %4; j 9f }\n" \ - ".section __ex_table,\"a\"\n" \ - ".align 4\n" \ - ".word 1b, 0b\n" \ - ".word 2b, 0b\n" \ - ".popsection\n" \ - "9:" \ - : "=&r" (ret) \ - : "r" (ptr), "r" (__lo32(__lo, __hi)), \ - "r" (__hi32(__lo, __hi)), "i" (-EFAULT)); \ - }) -#endif - -extern int __put_user_bad(void) - __attribute__((warning("sizeof __put_user argument not 1, 2, 4 or 8"))); - -/** - * __put_user: - Write a simple value into user space, with less checking. - * @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. - * - * Caller must check the pointer with access_ok() before calling this - * function. - * - * Returns zero on success, or -EFAULT on error. - */ -#define __put_user(x, ptr) \ -({ \ - int __ret; \ - typeof(*(ptr)) _x = (x); \ - __chk_user_ptr(ptr); \ - switch (sizeof(*(ptr))) { \ - case 1: __put_user_1(_x, ptr, __ret); break; \ - case 2: __put_user_2(_x, ptr, __ret); break; \ - case 4: __put_user_4(_x, ptr, __ret); break; \ - case 8: __put_user_8(_x, ptr, __ret); break; \ - default: __ret = __put_user_bad(); break; \ - } \ - __ret; \ -}) - -/* - * The versions of get_user and put_user without initial underscores - * check the address of their arguments to make sure they are not - * in kernel space. - */ -#define put_user(x, ptr) \ -({ \ - __typeof__(*(ptr)) __user *__Pu_addr = (ptr); \ - access_ok(VERIFY_WRITE, (__Pu_addr), sizeof(*(__Pu_addr))) ? \ - __put_user((x), (__Pu_addr)) : \ - -EFAULT; \ -}) - -#define get_user(x, ptr) \ -({ \ - __typeof__(*(ptr)) const __user *__Gu_addr = (ptr); \ - access_ok(VERIFY_READ, (__Gu_addr), sizeof(*(__Gu_addr))) ? \ - __get_user((x), (__Gu_addr)) : \ - ((x) = 0, -EFAULT); \ -}) - -extern unsigned long __must_check -raw_copy_to_user(void __user *to, const void *from, unsigned long n); -extern unsigned long __must_check -raw_copy_from_user(void *to, const void __user *from, unsigned long n); -#define INLINE_COPY_FROM_USER -#define INLINE_COPY_TO_USER - -#ifdef __tilegx__ -extern unsigned long raw_copy_in_user( - void __user *to, const void __user *from, unsigned long n); -#endif - - -extern long strnlen_user(const char __user *str, long n); -extern long strncpy_from_user(char *dst, const char __user *src, long); - -/** - * clear_user: - Zero a block of memory in user space. - * @mem: Destination address, in user space. - * @len: 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. - */ -extern unsigned long clear_user_asm(void __user *mem, unsigned long len); -static inline unsigned long __must_check __clear_user( - void __user *mem, unsigned long len) -{ - might_fault(); - return clear_user_asm(mem, len); -} -static inline unsigned long __must_check clear_user( - void __user *mem, unsigned long len) -{ - if (access_ok(VERIFY_WRITE, mem, len)) - return __clear_user(mem, len); - return len; -} - -/** - * flush_user: - Flush a block of memory in user space from cache. - * @mem: Destination address, in user space. - * @len: Number of bytes to flush. - * - * Returns number of bytes that could not be flushed. - * On success, this will be zero. - */ -extern unsigned long flush_user_asm(void __user *mem, unsigned long len); -static inline unsigned long __must_check __flush_user( - void __user *mem, unsigned long len) -{ - int retval; - - might_fault(); - retval = flush_user_asm(mem, len); - mb_incoherent(); - return retval; -} - -static inline unsigned long __must_check flush_user( - void __user *mem, unsigned long len) -{ - if (access_ok(VERIFY_WRITE, mem, len)) - return __flush_user(mem, len); - return len; -} - -/** - * finv_user: - Flush-inval a block of memory in user space from cache. - * @mem: Destination address, in user space. - * @len: Number of bytes to invalidate. - * - * Returns number of bytes that could not be flush-invalidated. - * On success, this will be zero. - */ -extern unsigned long finv_user_asm(void __user *mem, unsigned long len); -static inline unsigned long __must_check __finv_user( - void __user *mem, unsigned long len) -{ - int retval; - - might_fault(); - retval = finv_user_asm(mem, len); - mb_incoherent(); - return retval; -} -static inline unsigned long __must_check finv_user( - void __user *mem, unsigned long len) -{ - if (access_ok(VERIFY_WRITE, mem, len)) - return __finv_user(mem, len); - return len; -} - -#endif /* _ASM_TILE_UACCESS_H */ |