diff options
Diffstat (limited to 'include/asm-sh/uaccess.h')
| -rw-r--r-- | include/asm-sh/uaccess.h | 564 |
1 files changed, 3 insertions, 561 deletions
diff --git a/include/asm-sh/uaccess.h b/include/asm-sh/uaccess.h index 77c391f..ff24ce9 100644 --- a/include/asm-sh/uaccess.h +++ b/include/asm-sh/uaccess.h @@ -1,563 +1,5 @@ -/* $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) -{ - 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. - * - * Uhhuh, this needs 33-bit arithmetic. We have a carry.. - * - * sum := addr + size; carry? --> flag = true; - * if (sum >= addr_limit) flag = true; - */ -static inline int __access_ok(unsigned long addr, unsigned long size) -{ - unsigned long flag, sum; - - __asm__("clrt\n\t" - "addc %3, %1\n\t" - "movt %0\n\t" - "cmp/hi %4, %1\n\t" - "rotcl %0" - :"=&r" (flag), "=r" (sum) - :"1" (addr), "r" (size), - "r" (current_thread_info()->addr_limit.seg) - :"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 __user *)(x)) - -#define __get_user_size(x,ptr,size,retval) \ -do { \ - retval = 0; \ - __chk_user_ptr(ptr); \ - 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; \ - __chk_user_ptr(ptr); \ - 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; \ - __chk_user_ptr(ptr); \ - 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)) __user *__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"); }) +#ifdef CONFIG_SUPERH32 +# include "uaccess_32.h" #else -#define __put_user_u64(val,addr,retval) \ -({ \ -__asm__ __volatile__( \ - "1:\n\t" \ - "mov.l %S1,%2\n\t" \ - "mov.l %R1,%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"); }) +# include "uaccess_64.h" #endif - -extern void __put_user_unknown(void); - -/* Generic arbitrary sized copy. */ -/* Return the number of bytes NOT copied */ -__kernel_size_t __copy_user(void *to, const void *from, __kernel_size_t n); - -#define copy_to_user(to,from,n) ({ \ -void *__copy_to = (void *) (to); \ -__kernel_size_t __copy_size = (__kernel_size_t) (n); \ -__kernel_size_t __copy_res; \ -if(__copy_size && __access_ok((unsigned long)__copy_to, __copy_size)) { \ -__copy_res = __copy_user(__copy_to, (void *) (from), __copy_size); \ -} else __copy_res = __copy_size; \ -__copy_res; }) - -#define copy_from_user(to,from,n) ({ \ -void *__copy_to = (void *) (to); \ -void *__copy_from = (void *) (from); \ -__kernel_size_t __copy_size = (__kernel_size_t) (n); \ -__kernel_size_t __copy_res; \ -if(__copy_size && __access_ok((unsigned long)__copy_from, __copy_size)) { \ -__copy_res = __copy_user(__copy_to, __copy_from, __copy_size); \ -} else __copy_res = __copy_size; \ -__copy_res; }) - -static __always_inline unsigned long -__copy_from_user(void *to, const void __user *from, unsigned long n) -{ - return __copy_user(to, (__force void *)from, n); -} - -static __always_inline unsigned long __must_check -__copy_to_user(void __user *to, const void *from, unsigned long n) -{ - return __copy_user((__force void *)to, from, n); -} - -#define __copy_to_user_inatomic __copy_to_user -#define __copy_from_user_inatomic __copy_from_user - -/* - * Clear the area and return remaining number of bytes - * (on failure. Usually it's 0.) - */ -extern __kernel_size_t __clear_user(void *addr, __kernel_size_t size); - -#define clear_user(addr,n) ({ \ -void * __cl_addr = (addr); \ -unsigned long __cl_size = (n); \ -if (__cl_size && __access_ok(((unsigned long)(__cl_addr)), __cl_size)) \ -__cl_size = __clear_user(__cl_addr, __cl_size); \ -__cl_size; }) - -static __inline__ int -__strncpy_from_user(unsigned long __dest, unsigned long __user __src, int __count) -{ - __kernel_size_t res; - unsigned long __dummy, _d, _s; - - __asm__ __volatile__( - "9:\n" - "mov.b @%2+, %1\n\t" - "cmp/eq #0, %1\n\t" - "bt/s 2f\n" - "1:\n" - "mov.b %1, @%3\n\t" - "dt %7\n\t" - "bf/s 9b\n\t" - " add #1, %3\n\t" - "2:\n\t" - "sub %7, %0\n" - "3:\n" - ".section .fixup,\"ax\"\n" - "4:\n\t" - "mov.l 5f, %1\n\t" - "jmp @%1\n\t" - " mov %8, %0\n\t" - ".balign 4\n" - "5: .long 3b\n" - ".previous\n" - ".section __ex_table,\"a\"\n" - " .balign 4\n" - " .long 9b,4b\n" - ".previous" - : "=r" (res), "=&z" (__dummy), "=r" (_s), "=r" (_d) - : "0" (__count), "2" (__src), "3" (__dest), "r" (__count), - "i" (-EFAULT) - : "memory", "t"); - - return res; -} - -#define strncpy_from_user(dest,src,count) ({ \ -unsigned long __sfu_src = (unsigned long) (src); \ -int __sfu_count = (int) (count); \ -long __sfu_res = -EFAULT; \ -if(__access_ok(__sfu_src, __sfu_count)) { \ -__sfu_res = __strncpy_from_user((unsigned long) (dest), __sfu_src, __sfu_count); \ -} __sfu_res; }) - -/* - * Return the size of a string (including the ending 0!) - */ -static __inline__ long __strnlen_user(const char __user *__s, long __n) -{ - unsigned long res; - unsigned long __dummy; - - __asm__ __volatile__( - "9:\n" - "cmp/eq %4, %0\n\t" - "bt 2f\n" - "1:\t" - "mov.b @(%0,%3), %1\n\t" - "tst %1, %1\n\t" - "bf/s 9b\n\t" - " add #1, %0\n" - "2:\n" - ".section .fixup,\"ax\"\n" - "3:\n\t" - "mov.l 4f, %1\n\t" - "jmp @%1\n\t" - " mov #0, %0\n" - ".balign 4\n" - "4: .long 2b\n" - ".previous\n" - ".section __ex_table,\"a\"\n" - " .balign 4\n" - " .long 1b,3b\n" - ".previous" - : "=z" (res), "=&r" (__dummy) - : "0" (0), "r" (__s), "r" (__n) - : "t"); - return res; -} - -static __inline__ long strnlen_user(const char __user *s, long n) -{ - if (!__addr_ok(s)) - return 0; - else - return __strnlen_user(s, n); -} - -#define strlen_user(str) strnlen_user(str, ~0UL >> 1) - -/* - * 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; -}; - -extern int fixup_exception(struct pt_regs *regs); - -#endif /* __ASM_SH_UACCESS_H */ |