298 lines
7.8 KiB
C
298 lines
7.8 KiB
C
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/* MN10300 userspace access functions
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*
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* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public Licence
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* as published by the Free Software Foundation; either version
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* 2 of the Licence, or (at your option) any later version.
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*/
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#ifndef _ASM_UACCESS_H
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#define _ASM_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/kernel.h>
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#include <asm/page.h>
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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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* For historical reasons, these macros are grossly misnamed.
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*/
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#define MAKE_MM_SEG(s) ((mm_segment_t) { (s) })
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#define KERNEL_XDS MAKE_MM_SEG(0xBFFFFFFF)
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#define KERNEL_DS MAKE_MM_SEG(0x9FFFFFFF)
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#define USER_DS MAKE_MM_SEG(TASK_SIZE)
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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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#define set_fs(x) (current_thread_info()->addr_limit = (x))
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#define segment_eq(a, b) ((a).seg == (b).seg)
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#define __addr_ok(addr) \
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((unsigned long)(addr) < (current_thread_info()->addr_limit.seg))
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/*
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* check that a range of addresses falls within the current address limit
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*/
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static inline int ___range_ok(unsigned long addr, unsigned int size)
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{
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int flag = 1, tmp;
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asm(" add %3,%1 \n" /* set C-flag if addr + size > 4Gb */
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" bcs 0f \n"
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" cmp %4,%1 \n" /* jump if addr+size>limit (error) */
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" bhi 0f \n"
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" clr %0 \n" /* mark okay */
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"0: \n"
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: "=r"(flag), "=&r"(tmp)
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: "1"(addr), "ir"(size),
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"r"(current_thread_info()->addr_limit.seg), "0"(flag)
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: "cc"
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);
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return flag;
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}
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#define __range_ok(addr, size) ___range_ok((unsigned long)(addr), (u32)(size))
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#define access_ok(type, addr, size) (__range_ok((addr), (size)) == 0)
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#define __access_ok(addr, size) (__range_ok((addr), (size)) == 0)
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#include <asm/extable.h>
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#define put_user(x, ptr) __put_user_check((x), (ptr), sizeof(*(ptr)))
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#define get_user(x, ptr) __get_user_check((x), (ptr), sizeof(*(ptr)))
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/*
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* The "__xxx" versions do not do address space checking, useful when
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* doing multiple accesses to the same area (the user has to do the
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* checks by hand with "access_ok()")
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*/
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#define __put_user(x, ptr) __put_user_nocheck((x), (ptr), sizeof(*(ptr)))
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#define __get_user(x, ptr) __get_user_nocheck((x), (ptr), sizeof(*(ptr)))
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struct __large_struct { unsigned long buf[100]; };
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#define __m(x) (*(struct __large_struct *)(x))
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#define __get_user_nocheck(x, ptr, size) \
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({ \
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unsigned long __gu_addr; \
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int __gu_err; \
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__gu_addr = (unsigned long) (ptr); \
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switch (size) { \
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case 1: { \
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unsigned char __gu_val; \
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__get_user_asm("bu"); \
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(x) = *(__force __typeof__(*(ptr))*) &__gu_val; \
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break; \
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} \
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case 2: { \
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unsigned short __gu_val; \
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__get_user_asm("hu"); \
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(x) = *(__force __typeof__(*(ptr))*) &__gu_val; \
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break; \
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} \
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case 4: { \
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unsigned int __gu_val; \
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__get_user_asm(""); \
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(x) = *(__force __typeof__(*(ptr))*) &__gu_val; \
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break; \
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} \
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default: \
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__get_user_unknown(); \
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break; \
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} \
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__gu_err; \
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})
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#define __get_user_check(x, ptr, size) \
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({ \
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const __typeof__(*(ptr))* __guc_ptr = (ptr); \
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int _e; \
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if (likely(__access_ok((unsigned long) __guc_ptr, (size)))) \
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_e = __get_user_nocheck((x), __guc_ptr, (size)); \
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else { \
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_e = -EFAULT; \
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(x) = (__typeof__(x))0; \
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} \
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_e; \
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})
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#define __get_user_asm(INSN) \
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({ \
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asm volatile( \
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"1:\n" \
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" mov"INSN" %2,%1\n" \
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" mov 0,%0\n" \
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"2:\n" \
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" .section .fixup,\"ax\"\n" \
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"3:\n\t" \
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" mov 0,%1\n" \
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" mov %3,%0\n" \
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" jmp 2b\n" \
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" .previous\n" \
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" .section __ex_table,\"a\"\n" \
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" .balign 4\n" \
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" .long 1b, 3b\n" \
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" .previous" \
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: "=&r" (__gu_err), "=&r" (__gu_val) \
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: "m" (__m(__gu_addr)), "i" (-EFAULT)); \
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})
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extern int __get_user_unknown(void);
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#define __put_user_nocheck(x, ptr, size) \
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({ \
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union { \
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__typeof__(*(ptr)) val; \
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u32 bits[2]; \
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} __pu_val; \
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unsigned long __pu_addr; \
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int __pu_err; \
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__pu_val.val = (x); \
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__pu_addr = (unsigned long) (ptr); \
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switch (size) { \
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case 1: __put_user_asm("bu"); break; \
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case 2: __put_user_asm("hu"); break; \
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case 4: __put_user_asm("" ); break; \
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case 8: __put_user_asm8(); break; \
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default: __pu_err = __put_user_unknown(); break; \
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} \
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__pu_err; \
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})
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#define __put_user_check(x, ptr, size) \
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({ \
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union { \
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__typeof__(*(ptr)) val; \
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u32 bits[2]; \
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} __pu_val; \
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unsigned long __pu_addr; \
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int __pu_err; \
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__pu_val.val = (x); \
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__pu_addr = (unsigned long) (ptr); \
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if (likely(__access_ok(__pu_addr, size))) { \
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switch (size) { \
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case 1: __put_user_asm("bu"); break; \
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case 2: __put_user_asm("hu"); break; \
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case 4: __put_user_asm("" ); break; \
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case 8: __put_user_asm8(); break; \
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default: __pu_err = __put_user_unknown(); break; \
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} \
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} \
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else { \
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__pu_err = -EFAULT; \
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} \
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__pu_err; \
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})
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#define __put_user_asm(INSN) \
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({ \
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asm volatile( \
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"1:\n" \
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" mov"INSN" %1,%2\n" \
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" mov 0,%0\n" \
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"2:\n" \
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" .section .fixup,\"ax\"\n" \
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"3:\n" \
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" mov %3,%0\n" \
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" jmp 2b\n" \
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" .previous\n" \
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" .section __ex_table,\"a\"\n" \
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" .balign 4\n" \
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" .long 1b, 3b\n" \
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" .previous" \
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: "=&r" (__pu_err) \
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: "r" (__pu_val.val), "m" (__m(__pu_addr)), \
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"i" (-EFAULT) \
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); \
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})
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#define __put_user_asm8() \
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({ \
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asm volatile( \
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"1: mov %1,%3 \n" \
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"2: mov %2,%4 \n" \
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" mov 0,%0 \n" \
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"3: \n" \
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" .section .fixup,\"ax\" \n" \
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"4: \n" \
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" mov %5,%0 \n" \
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" jmp 3b \n" \
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" .previous \n" \
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" .section __ex_table,\"a\"\n" \
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" .balign 4 \n" \
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" .long 1b, 4b \n" \
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" .long 2b, 4b \n" \
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" .previous \n" \
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: "=&r" (__pu_err) \
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: "r" (__pu_val.bits[0]), "r" (__pu_val.bits[1]), \
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"m" (__m(__pu_addr)), "m" (__m(__pu_addr+4)), \
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"i" (-EFAULT) \
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); \
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})
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extern int __put_user_unknown(void);
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/*
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* Copy To/From Userspace
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*/
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/* Generic arbitrary sized copy. */
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#define __copy_user(to, from, size) \
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do { \
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if (size) { \
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void *__to = to; \
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const void *__from = from; \
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int w; \
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asm volatile( \
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"0: movbu (%0),%3;\n" \
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"1: movbu %3,(%1);\n" \
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" inc %0;\n" \
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" inc %1;\n" \
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" add -1,%2;\n" \
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" bne 0b;\n" \
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"2:\n" \
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" .section .fixup,\"ax\"\n" \
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"3: jmp 2b\n" \
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" .previous\n" \
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" .section __ex_table,\"a\"\n" \
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" .balign 4\n" \
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" .long 0b,3b\n" \
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" .long 1b,3b\n" \
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" .previous\n" \
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: "=a"(__from), "=a"(__to), "=r"(size), "=&r"(w)\
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: "0"(__from), "1"(__to), "2"(size) \
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: "cc", "memory"); \
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} \
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} while (0)
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static inline unsigned long
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raw_copy_from_user(void *to, const void __user *from, unsigned long n)
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{
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__copy_user(to, from, n);
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return n;
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}
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static inline unsigned long
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raw_copy_to_user(void __user *to, const void *from, unsigned long n)
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{
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__copy_user(to, from, n);
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return n;
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}
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extern long strncpy_from_user(char *dst, const char __user *src, long count);
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extern long strnlen_user(const char __user *str, long n);
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extern unsigned long clear_user(void __user *mem, unsigned long len);
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extern unsigned long __clear_user(void __user *mem, unsigned long len);
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#endif /* _ASM_UACCESS_H */
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