lkml.org 
[lkml]   [2006]   [Apr]   [21]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
SubjectRe: strncpy (maybe others) broken on Alpha
On Fri, Apr 21, 2006 at 01:55:56PM +0200, Mathieu Chouquet-Stringer wrote:
> I've attached to this email a tarball of what I use to test the
> compiler/binutils. It's faster than recompiling the whole kernel on
> these slow machines!

Oops. I was using a wrong copy of strncpy.S (remained from previous
__stxncpy() debugging). What's why I wasn't able to reproduce that...

It seems that the registers $24 and $27 are mixed up in strncpy().
This fixes your test case, please check if it fixes kernel problem
as well.

Ivan.

--- strncpy_debug/strncpy.S Thu Apr 20 14:18:05 2006
+++ strncpy.S Fri Apr 21 17:52:04 2006
@@ -43,8 +43,8 @@

.align 4
$multiword:
- subq $24, 1, $2 # clear the final bits in the prev word
- or $2, $24, $2
+ subq $27, 1, $2 # clear the final bits in the prev word
+ or $2, $27, $2
zapnot $1, $2, $1
subq $18, 1, $18

@@ -70,8 +70,8 @@
bne $18, 0b

1: ldq_u $1, 0($16) # clear the leading bits in the final word
- subq $27, 1, $2
- or $2, $27, $2
+ subq $24, 1, $2
+ or $2, $24, $2

zap $1, $2, $1
stq_u $1, 0($16)
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
\
 
 \ /
  Last update: 2006-04-21 16:25    [from the cache]
©2003-2011 Jasper Spaans