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microblaze: uaccess: fix clean user macro 

This is the first patch which does uaccess unification.
I choosed to do several patches to be able to use bisect
in future if any fault happens.

Signed-off-by: Michal Simek <monstr@monstr.eu>
This commit is contained in:
Michal Simek 2010-03-05 16:50:01 +01:00
parent 60a729f7bb
commit 40b1156db0
1 changed files with 55 additions and 34 deletions
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89
arch/microblaze/include/asm/uaccess.h
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@ -71,8 +71,6 @@ struct exception_table_entry {
unsigned long insn, fixup;
};
#define __clear_user(addr, n) (memset((void *)(addr), 0, (n)), 0)
#ifndef CONFIG_MMU
/* Check against bounds of physical memory */
@ -86,7 +84,31 @@ static inline int ___range_ok(unsigned long addr, unsigned long size)
___range_ok((unsigned long)(addr), (unsigned long)(size))
#define access_ok(type, addr, size) (__range_ok((addr), (size)) == 0)
#define __access_ok(add, size) (__range_ok((addr), (size)) == 0)
#else
/*
* 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)) */
#endif
#ifdef CONFIG_MMU
# define __FIXUP_SECTION ".section .fixup,\"ax\"\n"
# define __EX_TABLE_SECTION ".section __ex_table,\"a\"\n"
#else
# define __FIXUP_SECTION ".section .discard,\"ax\"\n"
# define __EX_TABLE_SECTION ".section .discard,\"a\"\n"
#endif
#ifndef CONFIG_MMU
/* Undefined function to trigger linker error */
extern int bad_user_access_length(void);
@ -151,6 +173,9 @@ extern int bad_user_access_length(void);
#define __copy_from_user_inatomic(to, from, n) \
(__copy_from_user((to), (from), (n)))
#define __clear_user(addr, n) (memset((void *)(addr), 0, (n)), 0)
/* stejne s MMU */
static inline unsigned long clear_user(void *addr, unsigned long size)
{
if (access_ok(VERIFY_WRITE, addr, size))
@ -166,17 +191,6 @@ 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
@ -297,27 +311,34 @@ __asm__ __volatile__ (" lwi %0, %1, 0; \
); \
})
/*
* 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)
/* Return: number of not copied bytes, i.e. 0 if OK or non-zero if fail. */
static inline unsigned long __must_check __clear_user(void __user *to,
unsigned long n)
{
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;
/* normal memset with two words to __ex_table */
__asm__ __volatile__ ( \
"1: sb r0, %2, r0;" \
" addik %0, %0, -1;" \
" bneid %0, 1b;" \
" addik %2, %2, 1;" \
"2: " \
__EX_TABLE_SECTION \
".word 1b,2b;" \
".previous;" \
: "=r"(n) \
: "0"(n), "r"(to)
);
return n;
}
static inline unsigned long __must_check clear_user(void __user *to,
unsigned long n)
{
might_sleep();
if (unlikely(!access_ok(VERIFY_WRITE, to, n)))
return n;
return __clear_user(to, n);
}
#define __copy_from_user(to, from, n) copy_from_user((to), (from), (n))