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| author | Michal Simek <monstr@monstr.eu> | 2010-03-22 20:31:26 +0100 |
|---|---|---|
| committer | Michal Simek <monstr@monstr.eu> | 2010-04-01 08:38:25 +0200 |
| commit | ca3865bae5ff86f5670edc9beebbd1f58c29de85 (patch) | |
| tree | 78aa70b8baec6a877c18ff2cdf7b018582157c21 | |
| parent | 6059b3cbeb27a38e3ca9ac9d2827f7b5be32e2ba (diff) | |
| download | linux-ca3865bae5ff86f5670edc9beebbd1f58c29de85.tar.bz2 | |
microblaze: Support word copying in copy_tofrom_user
Word copying is used only for aligned addresses.
Here is space for improving to use any better copying technique.
Look at memcpy implementation.
Signed-off-by: Michal Simek <monstr@monstr.eu>
| -rw-r--r-- | arch/microblaze/lib/uaccess_old.S | 39 |
1 files changed, 25 insertions, 14 deletions
diff --git a/arch/microblaze/lib/uaccess_old.S b/arch/microblaze/lib/uaccess_old.S index b327524a8032..5810cec54a7a 100644 --- a/arch/microblaze/lib/uaccess_old.S +++ b/arch/microblaze/lib/uaccess_old.S @@ -53,7 +53,6 @@ __strncpy_user: nop .size __strncpy_user, . - __strncpy_user - .section .fixup, "ax" .align 2 4: @@ -95,7 +94,6 @@ __strnlen_user: nop .size __strnlen_user, . - __strnlen_user - .section .fixup,"ax" 4: brid 3b @@ -121,21 +119,34 @@ __copy_tofrom_user: * 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 */ + beqid r7, 3f /* zero size is not likely */ + andi r3, r7, 0x3 /* filter add count */ + bneid r3, 4f /* if is odd value then byte copying */ + or r3, r5, r6 /* find if is any to/from unaligned */ + andi r3, r3, 0x3 /* mask unaligned */ + bneid r3, 1f /* it is unaligned -> then jump */ + or r3, r0, r0 + +/* at least one 4 byte copy */ +5: lw r4, r6, r3 +6: sw r4, r5, r3 + addik r7, r7, -4 + bneid r7, 5b + addik r3, r3, 4 + addik r3, r7, 0 + rtsd r15, 8 + nop +4: or r3, r0, r0 +1: lbu r4,r6,r3 +2: sb r4,r5,r3 + addik r7,r7,-1 + bneid r7,1b + addik r3,r3,1 /* delay slot */ 3: + addik r3,r7,0 rtsd r15,8 nop .size __copy_tofrom_user, . - __copy_tofrom_user - .section __ex_table,"a" - .word 1b,3b,2b,3b + .word 1b,3b,2b,3b,5b,3b,6b,3b |