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sh: switch to generic strncpy_from_user().

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This kills off the special sh32/64 versions and adopts the generic
version. It should be possible to optimize this for SH-4A unaligned
loads, but this is a corner case that can be supported incrementally.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Paul Mundt
2012-05-25 13:02:48 +09:00
parent 94fa83c424
commit 0e100e11bd
6 changed files with 5 additions and 114 deletions
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41
arch/sh/kernel/cpu/sh5/entry.S
View File

@@ -1568,46 +1568,6 @@ ___clear_user_exit:
#endif /* CONFIG_MMU */
/*
* int __strncpy_from_user(unsigned long __dest, unsigned long __src,
* int __count)
*
* Inputs:
* (r2) target address
* (r3) source address
* (r4) maximum size in bytes
*
* Ouputs:
* (*r2) copied data
* (r2) -EFAULT (in case of faulting)
* copied data (otherwise)
*/
.global __strncpy_from_user
__strncpy_from_user:
pta ___strncpy_from_user1, tr0
pta ___strncpy_from_user_done, tr1
or r4, ZERO, r5 /* r5 = original count */
beq/u r4, r63, tr1 /* early exit if r4==0 */
movi -(EFAULT), r6 /* r6 = reply, no real fixup */
or ZERO, ZERO, r7 /* r7 = data, clear top byte of data */
___strncpy_from_user1:
ld.b r3, 0, r7 /* Fault address: only in reading */
st.b r2, 0, r7
addi r2, 1, r2
addi r3, 1, r3
beq/u ZERO, r7, tr1
addi r4, -1, r4 /* return real number of copied bytes */
bne/l ZERO, r4, tr0
___strncpy_from_user_done:
sub r5, r4, r6 /* If done, return copied */
___strncpy_from_user_exit:
or r6, ZERO, r2
ptabs LINK, tr0
blink tr0, ZERO
/*
* extern long __strnlen_user(const char *__s, long __n)
*
@@ -1982,7 +1942,6 @@ asm_uaccess_start:
.long ___copy_user2, ___copy_user_exit
.long ___clear_user1, ___clear_user_exit
#endif
.long ___strncpy_from_user1, ___strncpy_from_user_exit
.long ___strnlen_user1, ___strnlen_user_exit
.long ___get_user_asm_b1, ___get_user_asm_b_exit
.long ___get_user_asm_w1, ___get_user_asm_w_exit

1
arch/sh/kernel/sh_ksyms_64.c
View File

@@ -33,7 +33,6 @@ EXPORT_SYMBOL(__get_user_asm_w);
EXPORT_SYMBOL(__get_user_asm_l);
EXPORT_SYMBOL(__get_user_asm_q);
EXPORT_SYMBOL(__strnlen_user);
EXPORT_SYMBOL(__strncpy_from_user);
EXPORT_SYMBOL(__clear_user);
EXPORT_SYMBOL(copy_page);
EXPORT_SYMBOL(__copy_user);