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Commit 0d6de953 authored by Michal Simek's avatar Michal Simek
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microblaze_mmu_v2: uaccess MMU update 

Signed-off-by: default avatarMichal Simek <monstr@monstr.eu>
parent 7db29dde
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Showing with 381 additions and 52 deletions
arch/microblaze/include/asm/uaccess.h
View file @ 0d6de953
/*
* Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu>
* Copyright (C) 2008-2009 PetaLogix
* Copyright (C) 2006 Atmark Techno, Inc.
*
* This file is subject to the terms and conditions of the GNU General Public
......@@ -26,6 +28,10 @@
#define VERIFY_READ 0
#define VERIFY_WRITE 1
#define __clear_user(addr, n) (memset((void *)(addr), 0, (n)), 0)
#ifndef CONFIG_MMU
extern int ___range_ok(unsigned long addr, unsigned long size);
#define __range_ok(addr, size) \
......@@ -38,63 +44,64 @@ extern int ___range_ok(unsigned long addr, unsigned long size);
extern int bad_user_access_length(void);
/* FIXME this is function for optimalization -> memcpy */
#define __get_user(var, ptr) \
({ \
int __gu_err = 0; \
switch (sizeof(*(ptr))) { \
case 1: \
case 2: \
case 4: \
(var) = *(ptr); \
break; \
case 8: \
memcpy((void *) &(var), (ptr), 8); \
break; \
default: \
(var) = 0; \
__gu_err = __get_user_bad(); \
break; \
} \
__gu_err; \
})
#define __get_user(var, ptr) \
({ \
int __gu_err = 0; \
switch (sizeof(*(ptr))) { \
case 1: \
case 2: \
case 4: \
(var) = *(ptr); \
break; \
case 8: \
memcpy((void *) &(var), (ptr), 8); \
break; \
default: \
(var) = 0; \
__gu_err = __get_user_bad(); \
break; \
} \
__gu_err; \
})
#define __get_user_bad() (bad_user_access_length(), (-EFAULT))
/* FIXME is not there defined __pu_val */
#define __put_user(var, ptr) \
({ \
int __pu_err = 0; \
switch (sizeof(*(ptr))) { \
case 1: \
case 2: \
case 4: \
*(ptr) = (var); \
break; \
case 8: { \
typeof(*(ptr)) __pu_val = var; \
memcpy(ptr, &__pu_val, sizeof(__pu_val));\
} \
break; \
default: \
__pu_err = __put_user_bad(); \
break; \
} \
__pu_err; \
})
({ \
int __pu_err = 0; \
switch (sizeof(*(ptr))) { \
case 1: \
case 2: \
case 4: \
*(ptr) = (var); \
break; \
case 8: { \
typeof(*(ptr)) __pu_val = (var); \
memcpy(ptr, &__pu_val, sizeof(__pu_val)); \
} \
break; \
default: \
__pu_err = __put_user_bad(); \
break; \
} \
__pu_err; \
})
#define __put_user_bad() (bad_user_access_length(), (-EFAULT))
#define put_user(x, ptr) __put_user(x, ptr)
#define get_user(x, ptr) __get_user(x, ptr)
#define copy_to_user(to, from, n) (memcpy(to, from, n), 0)
#define copy_from_user(to, from, n) (memcpy(to, from, n), 0)
#define put_user(x, ptr) __put_user((x), (ptr))
#define get_user(x, ptr) __get_user((x), (ptr))
#define __copy_to_user(to, from, n) (copy_to_user(to, from, n))
#define __copy_from_user(to, from, n) (copy_from_user(to, from, n))
#define __copy_to_user_inatomic(to, from, n) (__copy_to_user(to, from, n))
#define __copy_from_user_inatomic(to, from, n) (__copy_from_user(to, from, n))
#define copy_to_user(to, from, n) (memcpy((to), (from), (n)), 0)
#define copy_from_user(to, from, n) (memcpy((to), (from), (n)), 0)
#define __clear_user(addr, n) (memset((void *)addr, 0, n), 0)
#define __copy_to_user(to, from, n) (copy_to_user((to), (from), (n)))
#define __copy_from_user(to, from, n) (copy_from_user((to), (from), (n)))
#define __copy_to_user_inatomic(to, from, n) \
(__copy_to_user((to), (from), (n)))
#define __copy_from_user_inatomic(to, from, n) \
(__copy_from_user((to), (from), (n)))
static inline unsigned long clear_user(void *addr, unsigned long size)
{
......@@ -103,13 +110,200 @@ static inline unsigned long clear_user(void *addr, unsigned long size)
return size;
}
/* Returns 0 if exception not found and fixup otherwise. */
/* Returns 0 if exception not found and fixup otherwise. */
extern unsigned long search_exception_table(unsigned long);
extern long strncpy_from_user(char *dst, const char *src, long count);
extern long strnlen_user(const char *src, long count);
#else /* CONFIG_MMU */
/*
* Address is valid if:
* - "addr", "addr + size" and "size" are all below the limit
*/
#define access_ok(type, addr, size) \
(get_fs().seg > (((unsigned long)(addr)) | \
(size) | ((unsigned long)(addr) + (size))))
/* || printk("access_ok failed for %s at 0x%08lx (size %d), seg 0x%08x\n",
type?"WRITE":"READ",addr,size,get_fs().seg)) */
/*
* All the __XXX versions macros/functions below do not perform
* access checking. It is assumed that the necessary checks have been
* already performed before the finction (macro) is called.
*/
#define get_user(x, ptr) \
({ \
access_ok(VERIFY_READ, (ptr), sizeof(*(ptr))) \
? __get_user((x), (ptr)) : -EFAULT; \
})
#define put_user(x, ptr) \
({ \
access_ok(VERIFY_WRITE, (ptr), sizeof(*(ptr))) \
? __put_user((x), (ptr)) : -EFAULT; \
})
#define __get_user(x, ptr) \
({ \
unsigned long __gu_val; \
/*unsigned long __gu_ptr = (unsigned long)(ptr);*/ \
long __gu_err; \
switch (sizeof(*(ptr))) { \
case 1: \
__get_user_asm("lbu", (ptr), __gu_val, __gu_err); \
break; \
case 2: \
__get_user_asm("lhu", (ptr), __gu_val, __gu_err); \
break; \
case 4: \
__get_user_asm("lw", (ptr), __gu_val, __gu_err); \
break; \
default: \
__gu_val = 0; __gu_err = -EINVAL; \
} \
x = (__typeof__(*(ptr))) __gu_val; \
__gu_err; \
})
#define __get_user_asm(insn, __gu_ptr, __gu_val, __gu_err) \
({ \
__asm__ __volatile__ ( \
"1:" insn " %1, %2, r0; \
addk %0, r0, r0; \
2: \
.section .fixup,\"ax\"; \
3: brid 2b; \
addik %0, r0, %3; \
.previous; \
.section __ex_table,\"a\"; \
.word 1b,3b; \
.previous;" \
: "=r"(__gu_err), "=r"(__gu_val) \
: "r"(__gu_ptr), "i"(-EFAULT) \
); \
})
#define __put_user(x, ptr) \
({ \
__typeof__(*(ptr)) __gu_val = x; \
long __gu_err = 0; \
switch (sizeof(__gu_val)) { \
case 1: \
__put_user_asm("sb", (ptr), __gu_val, __gu_err); \
break; \
case 2: \
__put_user_asm("sh", (ptr), __gu_val, __gu_err); \
break; \
case 4: \
__put_user_asm("sw", (ptr), __gu_val, __gu_err); \
break; \
case 8: \
__put_user_asm_8((ptr), __gu_val, __gu_err); \
break; \
default: \
__gu_err = -EINVAL; \
} \
__gu_err; \
})
#define __put_user_asm_8(__gu_ptr, __gu_val, __gu_err) \
({ \
__asm__ __volatile__ (" lwi %0, %1, 0; \
1: swi %0, %2, 0; \
lwi %0, %1, 4; \
2: swi %0, %2, 4; \
addk %0,r0,r0; \
3: \
.section .fixup,\"ax\"; \
4: brid 3b; \
addik %0, r0, %3; \
.previous; \
.section __ex_table,\"a\"; \
.word 1b,4b,2b,4b; \
.previous;" \
: "=&r"(__gu_err) \
: "r"(&__gu_val), \
"r"(__gu_ptr), "i"(-EFAULT) \
); \
})
#define __put_user_asm(insn, __gu_ptr, __gu_val, __gu_err) \
({ \
__asm__ __volatile__ ( \
"1:" insn " %1, %2, r0; \
addk %0, r0, r0; \
2: \
.section .fixup,\"ax\"; \
3: brid 2b; \
addik %0, r0, %3; \
.previous; \
.section __ex_table,\"a\"; \
.word 1b,3b; \
.previous;" \
: "=r"(__gu_err) \
: "r"(__gu_val), "r"(__gu_ptr), "i"(-EFAULT) \
); \
})
/*
* Return: number of not copied bytes, i.e. 0 if OK or non-zero if fail.
*/
static inline int clear_user(char *to, int size)
{
if (size && access_ok(VERIFY_WRITE, to, size)) {
__asm__ __volatile__ (" \
1: \
sb r0, %2, r0; \
addik %0, %0, -1; \
bneid %0, 1b; \
addik %2, %2, 1; \
2: \
.section __ex_table,\"a\"; \
.word 1b,2b; \
.section .text;" \
: "=r"(size) \
: "0"(size), "r"(to)
);
}
return size;
}
extern unsigned long __copy_tofrom_user(void __user *to,
const void __user *from, unsigned long size);
#define copy_to_user(to, from, n) \
(access_ok(VERIFY_WRITE, (to), (n)) ? \
__copy_tofrom_user((void __user *)(to), \
(__force const void __user *)(from), (n)) \
: -EFAULT)
#define __copy_to_user(to, from, n) copy_to_user((to), (from), (n))
#define __copy_to_user_inatomic(to, from, n) copy_to_user((to), (from), (n))
#define copy_from_user(to, from, n) \
(access_ok(VERIFY_READ, (from), (n)) ? \
__copy_tofrom_user((__force void __user *)(to), \
(void __user *)(from), (n)) \
: -EFAULT)
#define __copy_from_user(to, from, n) copy_from_user((to), (from), (n))
#define __copy_from_user_inatomic(to, from, n) \
copy_from_user((to), (from), (n))
extern int __strncpy_user(char *to, const char __user *from, int len);
extern int __strnlen_user(const char __user *sstr, int len);
#define strncpy_from_user(to, from, len) \
(access_ok(VERIFY_READ, from, 1) ? \
__strncpy_user(to, from, len) : -EFAULT)
#define strnlen_user(str, len) \
(access_ok(VERIFY_READ, str, 1) ? __strnlen_user(str, len) : 0)
extern long strncpy_from_user(char *dst, const char __user *src, long count);
extern long strnlen_user(const char __user *src, long count);
extern long __strncpy_from_user(char *dst, const char __user *src, long count);
#endif /* CONFIG_MMU */
/*
* The exception table consists of pairs of addresses: the first is the
......
arch/microblaze/lib/uaccess_old.S 0 → 100644
View file @ 0d6de953
/*
* Copyright (C) 2009 Michal Simek <monstr@monstr.eu>
* Copyright (C) 2009 PetaLogix
* Copyright (C) 2007 LynuxWorks, Inc.
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/
#include <linux/errno.h>
#include <linux/linkage.h>
/*
* int __strncpy_user(char *to, char *from, int len);
*
* Returns:
* -EFAULT for an exception
* len if we hit the buffer limit
* bytes copied
*/
.text
.globl __strncpy_user;
.align 4;
__strncpy_user:
/*
* r5 - to
* r6 - from
* r7 - len
* r3 - temp count
* r4 - temp val
*/
addik r3,r7,0 /* temp_count = len */
beqi r3,3f
1:
lbu r4,r6,r0
sb r4,r5,r0
addik r3,r3,-1
beqi r3,2f /* break on len */
addik r5,r5,1
bneid r4,1b
addik r6,r6,1 /* delay slot */
addik r3,r3,1 /* undo "temp_count--" */
2:
rsubk r3,r3,r7 /* temp_count = len - temp_count */
3:
rtsd r15,8
nop
.section .fixup, "ax"
.align 2
4:
brid 3b
addik r3,r0, -EFAULT
.section __ex_table, "a"
.word 1b,4b
/*
* int __strnlen_user(char __user *str, int maxlen);
*
* Returns:
* 0 on error
* maxlen + 1 if no NUL byte found within maxlen bytes
* size of the string (including NUL byte)
*/
.text
.globl __strnlen_user;
.align 4;
__strnlen_user:
addik r3,r6,0
beqi r3,3f
1:
lbu r4,r5,r0
beqid r4,2f /* break on NUL */
addik r3,r3,-1 /* delay slot */
bneid r3,1b
addik r5,r5,1 /* delay slot */
addik r3,r3,-1 /* for break on len */
2:
rsubk r3,r3,r6
3:
rtsd r15,8
nop
.section .fixup,"ax"
4:
brid 3b
addk r3,r0,r0
.section __ex_table,"a"
.word 1b,4b
/*
* int __copy_tofrom_user(char *to, char *from, int len)
* Return:
* 0 on success
* number of not copied bytes on error
*/
.text
.globl __copy_tofrom_user;
.align 4;
__copy_tofrom_user:
/*
* r5 - to
* r6 - from
* r7, r3 - count
* r4 - tempval
*/
addik r3,r7,0
beqi r3,3f
1:
lbu r4,r6,r0
addik r6,r6,1
2:
sb r4,r5,r0
addik r3,r3,-1
bneid r3,1b
addik r5,r5,1 /* delay slot */
3:
rtsd r15,8
nop
.section __ex_table,"a"
.word 1b,3b,2b,3b
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