328 lines
8.7 KiB
C
328 lines
8.7 KiB
C
/*
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* Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu>
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* Copyright (C) 2008-2009 PetaLogix
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* Copyright (C) 2006 Atmark Techno, Inc.
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#ifndef _ASM_MICROBLAZE_UACCESS_H
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#define _ASM_MICROBLAZE_UACCESS_H
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#ifdef __KERNEL__
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#ifndef __ASSEMBLY__
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/sched.h> /* RLIMIT_FSIZE */
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#include <linux/mm.h>
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#include <asm/mmu.h>
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#include <asm/page.h>
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#include <asm/pgtable.h>
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#include <asm/segment.h>
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#include <linux/string.h>
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#define VERIFY_READ 0
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#define VERIFY_WRITE 1
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#define __clear_user(addr, n) (memset((void *)(addr), 0, (n)), 0)
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#ifndef CONFIG_MMU
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extern int ___range_ok(unsigned long addr, unsigned long size);
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#define __range_ok(addr, size) \
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___range_ok((unsigned long)(addr), (unsigned long)(size))
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#define access_ok(type, addr, size) (__range_ok((addr), (size)) == 0)
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#define __access_ok(add, size) (__range_ok((addr), (size)) == 0)
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/* Undefined function to trigger linker error */
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extern int bad_user_access_length(void);
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/* FIXME this is function for optimalization -> memcpy */
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#define __get_user(var, ptr) \
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({ \
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int __gu_err = 0; \
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switch (sizeof(*(ptr))) { \
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case 1: \
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case 2: \
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case 4: \
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(var) = *(ptr); \
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break; \
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case 8: \
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memcpy((void *) &(var), (ptr), 8); \
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break; \
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default: \
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(var) = 0; \
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__gu_err = __get_user_bad(); \
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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_bad() (bad_user_access_length(), (-EFAULT))
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/* FIXME is not there defined __pu_val */
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#define __put_user(var, ptr) \
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({ \
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int __pu_err = 0; \
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switch (sizeof(*(ptr))) { \
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case 1: \
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case 2: \
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case 4: \
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*(ptr) = (var); \
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break; \
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case 8: { \
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typeof(*(ptr)) __pu_val = (var); \
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memcpy(ptr, &__pu_val, sizeof(__pu_val)); \
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} \
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break; \
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default: \
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__pu_err = __put_user_bad(); \
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break; \
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} \
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__pu_err; \
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})
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#define __put_user_bad() (bad_user_access_length(), (-EFAULT))
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#define put_user(x, ptr) __put_user((x), (ptr))
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#define get_user(x, ptr) __get_user((x), (ptr))
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#define copy_to_user(to, from, n) (memcpy((to), (from), (n)), 0)
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#define copy_from_user(to, from, n) (memcpy((to), (from), (n)), 0)
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#define __copy_to_user(to, from, n) (copy_to_user((to), (from), (n)))
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#define __copy_from_user(to, from, n) (copy_from_user((to), (from), (n)))
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#define __copy_to_user_inatomic(to, from, n) \
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(__copy_to_user((to), (from), (n)))
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#define __copy_from_user_inatomic(to, from, n) \
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(__copy_from_user((to), (from), (n)))
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static inline unsigned long clear_user(void *addr, unsigned long size)
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{
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if (access_ok(VERIFY_WRITE, addr, size))
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size = __clear_user(addr, size);
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return size;
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}
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/* Returns 0 if exception not found and fixup otherwise. */
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extern unsigned long search_exception_table(unsigned long);
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extern long strncpy_from_user(char *dst, const char *src, long count);
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extern long strnlen_user(const char *src, long count);
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#else /* CONFIG_MMU */
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/*
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* Address is valid if:
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* - "addr", "addr + size" and "size" are all below the limit
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*/
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#define access_ok(type, addr, size) \
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(get_fs().seg > (((unsigned long)(addr)) | \
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(size) | ((unsigned long)(addr) + (size))))
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/* || printk("access_ok failed for %s at 0x%08lx (size %d), seg 0x%08x\n",
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type?"WRITE":"READ",addr,size,get_fs().seg)) */
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/*
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* All the __XXX versions macros/functions below do not perform
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* access checking. It is assumed that the necessary checks have been
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* already performed before the finction (macro) is called.
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*/
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#define get_user(x, ptr) \
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({ \
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access_ok(VERIFY_READ, (ptr), sizeof(*(ptr))) \
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? __get_user((x), (ptr)) : -EFAULT; \
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})
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#define put_user(x, ptr) \
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({ \
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access_ok(VERIFY_WRITE, (ptr), sizeof(*(ptr))) \
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? __put_user((x), (ptr)) : -EFAULT; \
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})
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#define __get_user(x, ptr) \
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({ \
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unsigned long __gu_val; \
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/*unsigned long __gu_ptr = (unsigned long)(ptr);*/ \
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long __gu_err; \
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switch (sizeof(*(ptr))) { \
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case 1: \
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__get_user_asm("lbu", (ptr), __gu_val, __gu_err); \
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break; \
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case 2: \
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__get_user_asm("lhu", (ptr), __gu_val, __gu_err); \
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break; \
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case 4: \
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__get_user_asm("lw", (ptr), __gu_val, __gu_err); \
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break; \
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default: \
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__gu_val = 0; __gu_err = -EINVAL; \
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} \
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x = (__typeof__(*(ptr))) __gu_val; \
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__gu_err; \
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})
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#define __get_user_asm(insn, __gu_ptr, __gu_val, __gu_err) \
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({ \
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__asm__ __volatile__ ( \
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"1:" insn " %1, %2, r0; \
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addk %0, r0, r0; \
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2: \
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.section .fixup,\"ax\"; \
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3: brid 2b; \
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addik %0, r0, %3; \
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.previous; \
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.section __ex_table,\"a\"; \
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.word 1b,3b; \
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.previous;" \
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: "=r"(__gu_err), "=r"(__gu_val) \
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: "r"(__gu_ptr), "i"(-EFAULT) \
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); \
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})
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#define __put_user(x, ptr) \
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({ \
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__typeof__(*(ptr)) volatile __gu_val = (x); \
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long __gu_err = 0; \
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switch (sizeof(__gu_val)) { \
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case 1: \
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__put_user_asm("sb", (ptr), __gu_val, __gu_err); \
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break; \
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case 2: \
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__put_user_asm("sh", (ptr), __gu_val, __gu_err); \
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break; \
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case 4: \
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__put_user_asm("sw", (ptr), __gu_val, __gu_err); \
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break; \
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case 8: \
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__put_user_asm_8((ptr), __gu_val, __gu_err); \
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break; \
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default: \
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__gu_err = -EINVAL; \
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} \
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__gu_err; \
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})
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#define __put_user_asm_8(__gu_ptr, __gu_val, __gu_err) \
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({ \
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__asm__ __volatile__ (" lwi %0, %1, 0; \
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1: swi %0, %2, 0; \
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lwi %0, %1, 4; \
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2: swi %0, %2, 4; \
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addk %0,r0,r0; \
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3: \
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.section .fixup,\"ax\"; \
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4: brid 3b; \
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addik %0, r0, %3; \
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.previous; \
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.section __ex_table,\"a\"; \
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.word 1b,4b,2b,4b; \
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.previous;" \
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: "=&r"(__gu_err) \
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: "r"(&__gu_val), \
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"r"(__gu_ptr), "i"(-EFAULT) \
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); \
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})
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#define __put_user_asm(insn, __gu_ptr, __gu_val, __gu_err) \
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({ \
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__asm__ __volatile__ ( \
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"1:" insn " %1, %2, r0; \
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addk %0, r0, r0; \
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2: \
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.section .fixup,\"ax\"; \
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3: brid 2b; \
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addik %0, r0, %3; \
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.previous; \
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.section __ex_table,\"a\"; \
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.word 1b,3b; \
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.previous;" \
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: "=r"(__gu_err) \
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: "r"(__gu_val), "r"(__gu_ptr), "i"(-EFAULT) \
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); \
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})
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/*
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* Return: number of not copied bytes, i.e. 0 if OK or non-zero if fail.
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*/
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static inline int clear_user(char *to, int size)
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{
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if (size && access_ok(VERIFY_WRITE, to, size)) {
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__asm__ __volatile__ (" \
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1: \
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sb r0, %2, r0; \
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addik %0, %0, -1; \
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bneid %0, 1b; \
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addik %2, %2, 1; \
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2: \
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.section __ex_table,\"a\"; \
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.word 1b,2b; \
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.section .text;" \
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: "=r"(size) \
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: "0"(size), "r"(to)
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);
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}
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return size;
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}
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extern unsigned long __copy_tofrom_user(void __user *to,
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const void __user *from, unsigned long size);
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#define copy_to_user(to, from, n) \
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(access_ok(VERIFY_WRITE, (to), (n)) ? \
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__copy_tofrom_user((void __user *)(to), \
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(__force const void __user *)(from), (n)) \
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: -EFAULT)
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#define __copy_to_user(to, from, n) copy_to_user((to), (from), (n))
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#define __copy_to_user_inatomic(to, from, n) copy_to_user((to), (from), (n))
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#define copy_from_user(to, from, n) \
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(access_ok(VERIFY_READ, (from), (n)) ? \
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__copy_tofrom_user((__force void __user *)(to), \
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(void __user *)(from), (n)) \
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: -EFAULT)
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#define __copy_from_user(to, from, n) copy_from_user((to), (from), (n))
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#define __copy_from_user_inatomic(to, from, n) \
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copy_from_user((to), (from), (n))
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extern int __strncpy_user(char *to, const char __user *from, int len);
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extern int __strnlen_user(const char __user *sstr, int len);
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#define strncpy_from_user(to, from, len) \
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(access_ok(VERIFY_READ, from, 1) ? \
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__strncpy_user(to, from, len) : -EFAULT)
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#define strnlen_user(str, len) \
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(access_ok(VERIFY_READ, str, 1) ? __strnlen_user(str, len) : 0)
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#endif /* CONFIG_MMU */
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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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#endif /* __ASSEMBLY__ */
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#endif /* __KERNEL__ */
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#endif /* _ASM_MICROBLAZE_UACCESS_H */
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