-/* $Id: uaccess.h,v 1.11 2003/10/13 07:21:20 lethal Exp $
- *
- * User space memory access functions
- *
- * Copyright (C) 1999, 2002 Niibe Yutaka
- * Copyright (C) 2003 Paul Mundt
- *
- * Based on:
- * MIPS implementation version 1.15 by
- * Copyright (C) 1996, 1997, 1998 by Ralf Baechle
- * and i386 version.
- */
-#ifndef __ASM_SH_UACCESS_H
-#define __ASM_SH_UACCESS_H
-
-#include <linux/errno.h>
-#include <linux/sched.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 (Data Segment Register?), these macros are misnamed.
- */
-
-#define MAKE_MM_SEG(s) ((mm_segment_t) { (s) })
-
-#define KERNEL_DS MAKE_MM_SEG(0xFFFFFFFFUL)
-#define USER_DS MAKE_MM_SEG(PAGE_OFFSET)
-
-#define segment_eq(a,b) ((a).seg == (b).seg)
-
-#define get_ds() (KERNEL_DS)
-
-#if !defined(CONFIG_MMU)
-/* NOMMU is always true */
-#define __addr_ok(addr) (1)
-
-static inline mm_segment_t get_fs(void)
-{
- return USER_DS;
-}
-
-static inline void set_fs(mm_segment_t s)
-{
-}
-
-/*
- * __access_ok: Check if address with size is OK or not.
- *
- * If we don't have an MMU (or if its disabled) the only thing we really have
- * to look out for is if the address resides somewhere outside of what
- * available RAM we have.
- *
- * TODO: This check could probably also stand to be restricted somewhat more..
- * though it still does the Right Thing(tm) for the time being.
- */
-static inline int __access_ok(unsigned long addr, unsigned long size)
-{
- extern unsigned long memory_start, memory_end;
-
- return ((addr >= memory_start) && ((addr + size) < memory_end));
-}
-#else /* CONFIG_MMU */
-#define __addr_ok(addr) \
- ((unsigned long)(addr) < (current_thread_info()->addr_limit.seg))
-
-#define get_fs() (current_thread_info()->addr_limit)
-#define set_fs(x) (current_thread_info()->addr_limit = (x))
-
-/*
- * __access_ok: Check if address with size is OK or not.
- *
- * We do three checks:
- * (1) is it user space?
- * (2) addr + size --> carry?
- * (3) addr + size >= 0x80000000 (PAGE_OFFSET)
- *
- * (1) (2) (3) | RESULT
- * 0 0 0 | ok
- * 0 0 1 | ok
- * 0 1 0 | bad
- * 0 1 1 | bad
- * 1 0 0 | ok
- * 1 0 1 | bad
- * 1 1 0 | bad
- * 1 1 1 | bad
- */
-static inline int __access_ok(unsigned long addr, unsigned long size)
-{
- unsigned long flag, tmp;
-
- __asm__("stc r7_bank, %0\n\t"
- "mov.l @(8,%0), %0\n\t"
- "clrt\n\t"
- "addc %2, %1\n\t"
- "and %1, %0\n\t"
- "rotcl %0\n\t"
- "rotcl %0\n\t"
- "and #3, %0"
- : "=&z" (flag), "=r" (tmp)
- : "r" (addr), "1" (size)
- : "t");
-
- return flag == 0;
-}
-#endif /* CONFIG_MMU */
-
-static inline int access_ok(int type, const void __user *p, unsigned long size)
-{
- unsigned long addr = (unsigned long)p;
- return __access_ok(addr, size);
-}
-
-/*
- * Uh, these should become the main single-value transfer routines ...
- * They automatically use the right size if we just have the right
- * pointer type ...
- *
- * As SuperH uses the same address space for kernel and user data, we
- * can just do these as direct assignments.
- *
- * 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 do not do address space checking, useful when
- * doing multiple accesses to the same area (the user has to do the
- * checks by hand with "access_ok()")
- */
-#define __put_user(x,ptr) \
- __put_user_nocheck((__typeof__(*(ptr)))(x),(ptr),sizeof(*(ptr)))
-#define __get_user(x,ptr) \
- __get_user_nocheck((x),(ptr),sizeof(*(ptr)))
-
-struct __large_struct { unsigned long buf[100]; };
-#define __m(x) (*(struct __large_struct *)(x))
-
-#define __get_user_size(x,ptr,size,retval) \
-do { \
- retval = 0; \
- switch (size) { \
- case 1: \
- __get_user_asm(x, ptr, retval, "b"); \
- break; \
- case 2: \
- __get_user_asm(x, ptr, retval, "w"); \
- break; \
- case 4: \
- __get_user_asm(x, ptr, retval, "l"); \
- break; \
- default: \
- __get_user_unknown(); \
- break; \
- } \
-} while (0)
-
-#define __get_user_nocheck(x,ptr,size) \
-({ \
- long __gu_err, __gu_val; \
- __get_user_size(__gu_val, (ptr), (size), __gu_err); \
- (x) = (__typeof__(*(ptr)))__gu_val; \
- __gu_err; \
-})
-
-#ifdef CONFIG_MMU
-#define __get_user_check(x,ptr,size) \
-({ \
- long __gu_err, __gu_val; \
- switch (size) { \
- case 1: \
- __get_user_1(__gu_val, (ptr), __gu_err); \
- break; \
- case 2: \
- __get_user_2(__gu_val, (ptr), __gu_err); \
- break; \
- case 4: \
- __get_user_4(__gu_val, (ptr), __gu_err); \
- break; \
- default: \
- __get_user_unknown(); \
- break; \
- } \
- \
- (x) = (__typeof__(*(ptr)))__gu_val; \
- __gu_err; \
-})
-
-#define __get_user_1(x,addr,err) ({ \
-__asm__("stc r7_bank, %1\n\t" \
- "mov.l @(8,%1), %1\n\t" \
- "and %2, %1\n\t" \
- "cmp/pz %1\n\t" \
- "bt/s 1f\n\t" \
- " mov #0, %0\n\t" \
- "0:\n" \
- "mov #-14, %0\n\t" \
- "bra 2f\n\t" \
- " mov #0, %1\n" \
- "1:\n\t" \
- "mov.b @%2, %1\n\t" \
- "extu.b %1, %1\n" \
- "2:\n" \
- ".section __ex_table,\"a\"\n\t" \
- ".long 1b, 0b\n\t" \
- ".previous" \
- : "=&r" (err), "=&r" (x) \
- : "r" (addr) \
- : "t"); \
-})
-
-#define __get_user_2(x,addr,err) ({ \
-__asm__("stc r7_bank, %1\n\t" \
- "mov.l @(8,%1), %1\n\t" \
- "and %2, %1\n\t" \
- "cmp/pz %1\n\t" \
- "bt/s 1f\n\t" \
- " mov #0, %0\n\t" \
- "0:\n" \
- "mov #-14, %0\n\t" \
- "bra 2f\n\t" \
- " mov #0, %1\n" \
- "1:\n\t" \
- "mov.w @%2, %1\n\t" \
- "extu.w %1, %1\n" \
- "2:\n" \
- ".section __ex_table,\"a\"\n\t" \
- ".long 1b, 0b\n\t" \
- ".previous" \
- : "=&r" (err), "=&r" (x) \
- : "r" (addr) \
- : "t"); \
-})
-
-#define __get_user_4(x,addr,err) ({ \
-__asm__("stc r7_bank, %1\n\t" \
- "mov.l @(8,%1), %1\n\t" \
- "and %2, %1\n\t" \
- "cmp/pz %1\n\t" \
- "bt/s 1f\n\t" \
- " mov #0, %0\n\t" \
- "0:\n" \
- "mov #-14, %0\n\t" \
- "bra 2f\n\t" \
- " mov #0, %1\n" \
- "1:\n\t" \
- "mov.l @%2, %1\n\t" \
- "2:\n" \
- ".section __ex_table,\"a\"\n\t" \
- ".long 1b, 0b\n\t" \
- ".previous" \
- : "=&r" (err), "=&r" (x) \
- : "r" (addr) \
- : "t"); \
-})
-#else /* CONFIG_MMU */
-#define __get_user_check(x,ptr,size) \
-({ \
- long __gu_err, __gu_val; \
- if (__access_ok((unsigned long)(ptr), (size))) { \
- __get_user_size(__gu_val, (ptr), (size), __gu_err); \
- (x) = (__typeof__(*(ptr)))__gu_val; \
- } else \
- __gu_err = -EFAULT; \
- __gu_err; \
-})
-#endif
-
-#define __get_user_asm(x, addr, err, insn) \
-({ \
-__asm__ __volatile__( \
- "1:\n\t" \
- "mov." insn " %2, %1\n\t" \
- "mov #0, %0\n" \
- "2:\n" \
- ".section .fixup,\"ax\"\n" \
- "3:\n\t" \
- "mov #0, %1\n\t" \
- "mov.l 4f, %0\n\t" \
- "jmp @%0\n\t" \
- " mov %3, %0\n" \
- "4: .long 2b\n\t" \
- ".previous\n" \
- ".section __ex_table,\"a\"\n\t" \
- ".long 1b, 3b\n\t" \
- ".previous" \
- :"=&r" (err), "=&r" (x) \
- :"m" (__m(addr)), "i" (-EFAULT)); })
-
-extern void __get_user_unknown(void);
-
-#define __put_user_size(x,ptr,size,retval) \
-do { \
- retval = 0; \
- switch (size) { \
- case 1: \
- __put_user_asm(x, ptr, retval, "b"); \
- break; \
- case 2: \
- __put_user_asm(x, ptr, retval, "w"); \
- break; \
- case 4: \
- __put_user_asm(x, ptr, retval, "l"); \
- break; \
- case 8: \
- __put_user_u64(x, ptr, retval); \
- break; \
- default: \
- __put_user_unknown(); \
- } \
-} while (0)
-
-#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)) *__pu_addr = (ptr); \
- \
- if (__access_ok((unsigned long)__pu_addr,size)) \
- __put_user_size((x),__pu_addr,(size),__pu_err); \
- __pu_err; \
-})
-
-#define __put_user_asm(x, addr, err, insn) \
-({ \
-__asm__ __volatile__( \
- "1:\n\t" \
- "mov." insn " %1, %2\n\t" \
- "mov #0, %0\n" \
- "2:\n" \
- ".section .fixup,\"ax\"\n" \
- "3:\n\t" \
- "nop\n\t" \
- "mov.l 4f, %0\n\t" \
- "jmp @%0\n\t" \
- "mov %3, %0\n" \
- "4: .long 2b\n\t" \
- ".previous\n" \
- ".section __ex_table,\"a\"\n\t" \
- ".long 1b, 3b\n\t" \
- ".previous" \
- :"=&r" (err) \
- :"r" (x), "m" (__m(addr)), "i" (-EFAULT) \
- :"memory"); })
-
-#if defined(__LITTLE_ENDIAN__)
-#define __put_user_u64(val,addr,retval) \
-({ \
-__asm__ __volatile__( \
- "1:\n\t" \
- "mov.l %R1,%2\n\t" \
- "mov.l %S1,%T2\n\t" \
- "mov #0,%0\n" \
- "2:\n" \
- ".section .fixup,\"ax\"\n" \
- "3:\n\t" \
- "nop\n\t" \
- "mov.l 4f,%0\n\t" \
- "jmp @%0\n\t" \
- " mov %3,%0\n" \
- "4: .long 2b\n\t" \
- ".previous\n" \
- ".section __ex_table,\"a\"\n\t" \
- ".long 1b, 3b\n\t" \
- ".previous" \
- : "=r" (retval) \
- : "r" (val), "m" (__m(addr)), "i" (-EFAULT) \
- : "memory"); })