Martin, As I understand LARL, the current PSW is used as the base to address the symbol. If the symbol is in a DSECT, the LARL instruction should generate an assembler error.
John -----Original Message----- From: IBM Mainframe Assembler List [mailto:[email protected]] On Behalf Of Steve Comstock Sent: Monday, December 20, 2010 9:25 AM To: [email protected] Subject: Re: Baseless vs Based On 12/20/2010 7:05 AM, Bodoh John Robert wrote: > Ed, Martin, John, Tony, et al, > > What I am doing is creating macros that are used by any other > application. I was hoping to avoid having the user of these > macros have to specify the technique needed to address symbols. > That sounds clutzy and it nowhere else in the assembler do I > have to tell the assembler that kind of detail. > > At the time the macro is being used, the macro does not know > whether baseless coding is being used or not and whether or not > a symbol is within the current CSECT or not. If the symbol is > within the current CSECT and code invoking the macro is using > baseless coding, the macro MUST use baseless instructions. > AsI understand it, the symbol is within the current CSECT, > baseless instructions can be used whether or not the invoking > code is using baseless or not. Otherwise, based instructions > MUST be used. I'm at a loss here. First, you reference symbols for one of two reasons: 1) a target for a branch or execute instruction, and 2) a location for an operand. In case 1), you can always use the so-called baseless instructions; in case 2), it depends on the operation you need to perform. For example, loading an address of a location can always be done by LARL - unless the item is at an odd address! If you need to work with packed decimal data, you must use the xP instructions, all of which require base / displacement. What instructions are you thinking of where you would choose between baseless and based? > > I am surprised this not considered a hole in the assembler > and is not more pervasive than just for me and my simple case. > Do not other macros have the same problem? > > John > > -----Original Message----- > From: IBM Mainframe Assembler List [mailto:[email protected]] > On Behalf Of Martin Trübner > Sent: Saturday, December 18, 2010 3:55 AM > To: [email protected] > Subject: Re: Baseless vs Based > > Ed, > > While I understand your point (missed you anyway in this thread ;-) ) I > do not see the word DSECT mentioned in the OP-s stmt. > > John, was your question as simple as I assume or was it as > sophisticated as Tony and Ed answered (with solutions from John E. and > Paul)? > > -- > Martin > > Pi_cap_CPU - all you ever need around MWLC/SCRT/CMT in z/VSE > more at http://www.picapcpu.de > -- Kind regards, -Steve Comstock The Trainer's Friend, Inc. 303-393-8716 http://www.trainersfriend.com * To get a good Return on your Investment, first make an investment! + Training your people is an excellent investment * Try our new tool for calculating your Return On Investment for training dollars at http://www.trainersfriend.com/ROI/roi.html
