[Bug ports/14595] New: memset is broken on powerpc 405
jgunthorpe at gmail dot com
sourceware-bugzilla@sourceware.org
Wed Sep 19 20:03:00 GMT 2012
http://sourceware.org/bugzilla/show_bug.cgi?id=14595
Bug #: 14595
Summary: memset is broken on powerpc 405
Product: glibc
Version: 2.17
Status: NEW
Severity: critical
Priority: P2
Component: ports
AssignedTo: unassigned@sourceware.org
ReportedBy: jgunthorpe@gmail.com
CC: carlos@systemhalted.org, roland@gnu.org
Classification: Unclassified
Created attachment 6638
--> http://sourceware.org/bugzilla/attachment.cgi?id=6638
fixed memset
The use_dcbz path in the hand coded assembly is assuming a 128 byte clear size
for dcbz, but dcbz uses the cache line size and 405 cores only have a 32 byte
cache line. So any clears to 0 that use the dcbz path fail to work.
Some high end PPC's have a 128 byte cache line, but all 405's are 32 byte,
see arch/powerpc/kernel/cputable.c, dcache_bsize assignments. This value
flows from the kernel to glibc's __cache_line_size value which drives
the dcbz step in the generic memset.
Attached is a patch.
Seen while testing on a 405GP.
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