On 3/28/2013 1:17 PM, John Gilmore wrote:
I did not find Kevin Kelley's post entirely persuasive. This
restriction long antedates 2 Kibyte pages, and the equation 8 x 2048 =
32768 is thus historically irrelevant.
Does the two-fullword---not doubleword?---prefix have the structure
|?|?|?|?|?||?|?|c|c|, in which |c|c| is the length L >= 0 in bytes of
the PARM value?
From looking at a dump the format is:
pppppppp 0000llll xxxxxxx
At entry R1 points to pppppppp
pppppppp is the pointer to the length field of the parm (high bit on).
llll is the length of the parm
xxxxxxx is the value of the parm
In my case the pppppppp field is on a double word boundary, making
the parm value also on a double word boundary. I suspect this is on
purpose, but I haven't looked for documentation to support this.
--
Richard
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