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authorDavid S. Miller <davem@sunset.davemloft.net>2006-06-04 21:32:01 -0700
committerDavid S. Miller <davem@sunset.davemloft.net>2006-06-04 21:32:01 -0700
commitae5de0ff0bc24664a053109c6caa782ba2ad7c53 (patch)
treed1362b5cf494f2495d318f6ca6eccd79aae77997 /arch/sparc64
parent672c6108a51bf559d19595d9f8193dfd81f0f752 (diff)
downloadop-kernel-dev-ae5de0ff0bc24664a053109c6caa782ba2ad7c53.zip
op-kernel-dev-ae5de0ff0bc24664a053109c6caa782ba2ad7c53.tar.gz
[SPARC64]: Fix missing fold at end of checksums.
Both csum_partial() and the csum_partial_copy*() family of routines forget to do a final fold on the computed checksum value on sparc64. So do the standard Sparc "add + set condition codes, add carry" sequence, then make sure the high 32-bits of the return value are clear. Based upon some excellent detective work and debugging done by Richard Braun and Samuel Thibault. Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch/sparc64')
-rw-r--r--arch/sparc64/lib/checksum.S5
-rw-r--r--arch/sparc64/lib/csum_copy.S5
2 files changed, 6 insertions, 4 deletions
diff --git a/arch/sparc64/lib/checksum.S b/arch/sparc64/lib/checksum.S
index ba9cd3c..1d230f6 100644
--- a/arch/sparc64/lib/checksum.S
+++ b/arch/sparc64/lib/checksum.S
@@ -165,8 +165,9 @@ csum_partial_end_cruft:
sll %g1, 8, %g1
or %o5, %g1, %o4
-1: add %o2, %o4, %o2
+1: addcc %o2, %o4, %o2
+ addc %g0, %o2, %o2
csum_partial_finish:
retl
- mov %o2, %o0
+ srl %o2, 0, %o0
diff --git a/arch/sparc64/lib/csum_copy.S b/arch/sparc64/lib/csum_copy.S
index 71af488..e566c77 100644
--- a/arch/sparc64/lib/csum_copy.S
+++ b/arch/sparc64/lib/csum_copy.S
@@ -221,11 +221,12 @@ FUNC_NAME: /* %o0=src, %o1=dst, %o2=len, %o3=sum */
sll %g1, 8, %g1
or %o5, %g1, %o4
-1: add %o3, %o4, %o3
+1: addcc %o3, %o4, %o3
+ addc %g0, %o3, %o3
70:
retl
- mov %o3, %o0
+ srl %o3, 0, %o0
95: mov 0, GLOBAL_SPARE
brlez,pn %o2, 4f
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