>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
