On 4/29/2011 9:54 PM, Barkow, Eileen wrote:
According to this chart, bit 32 should remain U (for unchanged?) even in 31 bit
mode.
But then again, it should also remain U for BASR.
I was reading SA22-7832-08 (the latest I have of z/Arch pop)
Page 7-33
Right down the bottom right column :
The Left most bit of the the 32 bit of the register is clearly indicated
as being 1 in the figure.. Furthermore :
The link information in the 31-bit addressing mode
consists of bit 32 of the PSW, the *basic-addressingmode
bit (always a one)* and the rightmost 31 bits of
the updated instruction address, arranged in bit positions
32-63 of the first-operand location in the following
format:
(Emphasis mine)..
--Ivan
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