From: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Herbert Xu wrote:
The current stxncpy on alpha is still broken when it comes to single
word, unaligned, src misalignment > dest misalignment copies.
I've attached a program which demonstrates this problem.
It fails when there is a zero byte before the data.
---
25-akpm/arch/alpha/lib/ev6-stxncpy.S | 2 +-
25-akpm/arch/alpha/lib/stxncpy.S | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)
diff -puN arch/alpha/lib/ev6-stxncpy.S~alpha-fix-unaligned-stxncpy-again arch/alpha/lib/ev6-stxncpy.S
--- 25/arch/alpha/lib/ev6-stxncpy.S~alpha-fix-unaligned-stxncpy-again Fri Apr 9 14:47:25 2004
+++ 25-akpm/arch/alpha/lib/ev6-stxncpy.S Fri Apr 9 14:47:25 2004
@@ -365,7 +365,7 @@ $unaligned:
andnot t2, t6, t12 # E : dest mask for a single word copy
or t8, t10, t5 # E : test for end-of-count too
- cmpbge zero, t2, t3 # E :
+ cmpbge zero, t12, t3 # E :
cmoveq a2, t5, t8 # E : Latency=2, extra map slot
nop # E : keep with cmoveq
andnot t8, t3, t8 # E : (stall)
diff -puN arch/alpha/lib/stxncpy.S~alpha-fix-unaligned-stxncpy-again arch/alpha/lib/stxncpy.S
--- 25/arch/alpha/lib/stxncpy.S~alpha-fix-unaligned-stxncpy-again Fri Apr 9 14:47:25 2004
+++ 25-akpm/arch/alpha/lib/stxncpy.S Fri Apr 9 14:47:25 2004
@@ -317,7 +317,7 @@ $unaligned:
cmpbge zero, t1, t8 # .. e1 : is there a zero?
andnot t2, t6, t12 # e0 : dest mask for a single word copy
or t8, t10, t5 # .. e1 : test for end-of-count too
- cmpbge zero, t2, t3 # e0 :
+ cmpbge zero, t12, t3 # e0 :
cmoveq a2, t5, t8 # .. e1 :
andnot t8, t3, t8 # e0 :
beq t8, $u_head # .. e1 (zdb)
_