svn commit: r266116 - head/sys/powerpc/aim
Nathan Whitehorn
nwhitehorn at freebsd.org
Thu May 15 13:52:03 UTC 2014
On 05/15/14 06:45, Nathan Whitehorn wrote:
> On 05/14/14 21:18, Justin Hibbits wrote:
>> Author: jhibbits
>> Date: Thu May 15 04:18:06 2014
>> New Revision: 266116
>> URL: http://svnweb.freebsd.org/changeset/base/266116
>>
>> Log:
>> A page mask size is 12-bits, not 11.
>> MFC after: 1 week
>>
>> Modified:
>> head/sys/powerpc/aim/trap_subr32.S
>>
>> Modified: head/sys/powerpc/aim/trap_subr32.S
>> ==============================================================================
>>
>> --- head/sys/powerpc/aim/trap_subr32.S Thu May 15 03:47:52 2014
>> (r266115)
>> +++ head/sys/powerpc/aim/trap_subr32.S Thu May 15 04:18:06 2014
>> (r266116)
>> @@ -677,7 +677,7 @@ disitrap:
>> mtcr %r31
>> bt 17,realtrap /* branch is user mode */
>> mfsprg1 %r31 /* get old SP */
>> - clrrwi %r31,%r31,11 /* Round SP down to nearest page */
>> + clrrwi %r31,%r31,12 /* Round SP down to nearest page */
>> sub. %r30,%r31,%r30 /* SP - DAR */
>> bge 1f
>> neg %r30,%r30 /* modulo value */
>>
>
> Is it? 4096 bytes is 2^12. The mask is 4096-1, which is 11 bits all 1.
> -Nathan
>
Sorry, I can't do math. Please ignore this email.
-Nathan
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