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openrisc: use generic strncpy_from_user 

As per commits 2922585b93 ("lib: Sparc's strncpy_from_user is generic
enough, move under lib/") and 92ae03f2ef ("x86: merge 32/64-bit
versions of 'strncpy_from_user()' and speed it up"), and corresponding
discussion on linux-arch.

Signed-off-by: Jonas Bonn <jonas@southpole.se>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jonas Bonn 2012-05-25 08:24:49 +02:00 committed by Linus Torvalds
parent ece78b7df7
commit 603d6637ae
3 changed files with 4 additions and 59 deletions
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1
arch/openrisc/Kconfig
View File

@ -19,6 +19,7 @@ config OPENRISC
select GENERIC_CPU_DEVICES
select GENERIC_ATOMIC64
select GENERIC_CLOCKEVENTS
select GENERIC_STRNCPY_FROM_USER
config MMU
def_bool y

10
arch/openrisc/include/asm/uaccess.h
View File

@ -313,14 +313,10 @@ clear_user(void *addr, unsigned long size)
return size;
}
extern int __strncpy_from_user(char *dst, const char *src, long count);
#define user_addr_max() \
(segment_eq(get_fs(), USER_DS) ? TASK_SIZE : ~0UL)
static inline long strncpy_from_user(char *dst, const char *src, long count)
{
if (access_ok(VERIFY_READ, src, 1))
return __strncpy_from_user(dst, src, count);
return -EFAULT;
}
extern long strncpy_from_user(char *dest, const char __user *src, long count);
/*
* Return the size of a string (including the ending 0)

52
arch/openrisc/lib/string.S
View File

@ -104,58 +104,6 @@ __clear_user:
.long 9b, 99b // write fault
.previous
/*
* long strncpy_from_user(char *dst, const char *src, long count)
*
*
*/
.global __strncpy_from_user
__strncpy_from_user:
l.addi r1,r1,-16
l.sw 0(r1),r6
l.sw 4(r1),r5
l.sw 8(r1),r4
l.sw 12(r1),r3
l.addi r11,r5,0
2: l.sfeq r5,r0
l.bf 1f
l.addi r5,r5,-1
8: l.lbz r6,0(r4)
l.sfeq r6,r0
l.bf 1f
9: l.sb 0(r3),r6
l.addi r3,r3,1
l.j 2b
l.addi r4,r4,1
1:
l.lwz r6,0(r1)
l.addi r5,r5,1
l.sub r11,r11,r5 // r11 holds the return value
l.lwz r6,0(r1)
l.lwz r5,4(r1)
l.lwz r4,8(r1)
l.lwz r3,12(r1)
l.jr r9
l.addi r1,r1,16
.section .fixup, "ax"
99:
l.movhi r11,hi(-EFAULT)
l.ori r11,r11,lo(-EFAULT)
l.lwz r6,0(r1)
l.lwz r5,4(r1)
l.lwz r4,8(r1)
l.lwz r3,12(r1)
l.jr r9
l.addi r1,r1,16
.previous
.section __ex_table, "a"
.long 8b, 99b // read fault
.previous
/*
* extern int __strnlen_user(const char *str, long len, unsigned long top);