Yes Hercules follows the POP doc
While a real brand new machine and yes IBM not hatching or PSI mainframe
Does not follow the POPS doc
Sent from my iPhone
On Apr 29, 2011, at 3:46 PM, Ivan Warren <[email protected]> wrote:
On 4/29/2011 9:35 PM, Barkow, Eileen wrote:
From principles of operation:
Both BRANCH AND LINK and BRANCH AND SAVE have an R1 field. They
form a branch address by means of fields that depend on the
instruction. The operations of the instructions are summarized as
follows:
In the 24-bit addressing mode, both instructions place the return
address in bit positions 40-63 of general register R1 and leave
bits 0-31 of that register unchanged. BRANCH AND LINK places the
instruction-length code for the instruction and also the condition
code and program mask from the current PSW in bit positions 32-39
of general register R1. BRANCH AND SAVE places zeros in those bit
positions.
In the 31-bit addressing mode, both instructions place the return
address in bit positions 33-63 and a one in bit position 32 of
general register R1, and they leave bits 0-31 of the register
unchanged.
In the 64-bit addressing mode, both instructions place the return
address in bit positions 0-63 of general register R1.
In any addressing mode, both instructions generate the branch
address under the control of the current addressing mode. The
instructions place bits 0-63 of the branch address in bit positions
64-127 of the PSW. In the RR format, both instructions do not
perform branching if the R2 field of the instruction is zero.
Wait wait...
Are you saying hercules has the instruction correctly, but some
other implementation isn't ?
(Just checked the BALR implementation... it DOES what the z/Arch POP
says).
AMODE : Bit mapping
---------------------
24 Bit : [ILC|CC](8)|IA(24) (32 bit reg)
31 Bit : 1(1)|IA(31) (32 bit reg)
64 Bit : IA(64) (64 bit reg)
(in which case my BASR comment was moot !)
--Ivan
----------------------------------------------------------------------
For IBM-MAIN subscribe / signoff / archive access instructions,
send email to [email protected] with the message: GET IBM-MAIN INFO
Search the archives at http://bama.ua.edu/archives/ibm-main.html
----------------------------------------------------------------------
For IBM-MAIN subscribe / signoff / archive access instructions,
send email to [email protected] with the message: GET IBM-MAIN INFO
Search the archives at http://bama.ua.edu/archives/ibm-main.html
