But BALR didn't update high order bit if R1 in 31 bit mode
Sent from my iPhone
On Apr 29, 2011, at 3:35 PM, "Barkow, Eileen" <[email protected]>
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.
-----Original Message-----
From: IBM Mainframe Discussion List [mailto:[email protected]] On
Behalf Of Ivan Warren
Sent: Friday, April 29, 2011 3:30 PM
To: [email protected]
Subject: Re: Strange BALR 31 bit mode experince
On 4/29/2011 9:21 PM, Micheal Butz wrote:
Yes changed it still should of worked
IVAN would of worked on Hercules
Oh Believe me..
BALR works the same on hercules as it does on other implementations of
the S/370, S/390 and z/Architecture !
--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
----------------------------------------------------------------------
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
