As noted before, this is the Z390 assembler. As you can see from the assembler listing, and verify from the OBJ dump, X'00000004' is assembled in the object program for all constants.
I am a little surprised by the SIGN=+ in the RLD listing. The OS/360 and successor assemblers are the only ones that I know of that allow for relocation factors of -1 or 2, and I am not sure that the assembler is doing that right. (And V constants probably shouldn't do it, either.) 10:44:00 extrn MZ390 START USING z390 V1.5.06 ON J2SE 1.8.0_60 08/26/15 AZ390I Copyright 2011 Automated Software Tools Corporation AZ390I z390 is licensed under GNU General Public License AZ390I program = C:\Users\c-glenh\z390\extrn AZ390I options = sysmac(C:\PROGRA~2\AUTOMA~1\z390\mac+.) syscpy(C:\PROGRA~2\AUTOMA~1\z390\mac+.) External Symbol Definitions ESD=0001 LOC=00000000 LEN=00000018 TYPE=CST NAME=XXX ESD=0002 LOC=00000000 LEN=00000000 TYPE=EXT NAME=YYY ESD=0003 LOC=00000000 LEN=00000000 TYPE=EXT NAME=ZZZ Assembler Listing 000000 (1/1)1 * test V constants 000000 (1/2)2 XXX CSECT 000000 (1/3)3 EXTRN YYY 000000 00000004 (1/4)4 DC V(ZZZ+4) 000004 00000004 (1/5)5 DC A(YYY+4) 000008 00000004 (1/6)6 DC V(-ZZZ+4) 00000C 00000004 (1/7)7 DC A(-YYY+4) 000010 00000004 (1/8)8 DC V(ZZZ+ZZZ+4) 000014 00000004 (1/9)9 DC A(YYY+YYY+4) 000018 (1/10)10 END Relocation Definitions ESD=0001 LOC=00000000 LEN=4 SIGN=+ XESD=0003 ESD=0001 LOC=00000004 LEN=4 SIGN=+ XESD=0002 ESD=0001 LOC=00000008 LEN=4 SIGN=+ XESD=0003 ESD=0001 LOC=0000000C LEN=4 SIGN=+ XESD=0002 ESD=0001 LOC=00000010 LEN=4 SIGN=+ XESD=0003 ESD=0001 LOC=00000010 LEN=4 SIGN=+ XESD=0003 ESD=0001 LOC=00000014 LEN=4 SIGN=+ XESD=0002 ESD=0001 LOC=00000014 LEN=4 SIGN=+ XESD=0002 Symbol Table Listing SYM=XXX LOC=00000000 LEN=00000018 ESD=0001 TYPE=CST XREF=2 SYM=YYY LOC=00000000 LEN=00000000 ESD=0002 TYPE=EXT XREF= SYM=ZZZ LOC=00000000 LEN=00000000 ESD=0003 TYPE=EXT XREF=4 6 8 Literal Table Listing AZ390I total mnote warnings = 0 AZ390I total mnote errors = 0 AZ390I max mnote level = 0 AZ390I total mz390 errors = 0 AZ390I total az390 errors = 0 10:44:02 extrn MZ390 ENDED RC= 0 SEC= 0 MEM(MB)= 32 IO=66 And hex dump of the OBJ file: 0000000 02 c5 e2 c4 40 40 40 40 40 40 00 10 40 40 00 01 0000020 e7 e7 e7 40 40 40 40 40 00 00 00 00 07 00 00 18 0000040 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 * 0000120 02 c5 e2 c4 40 40 40 40 40 40 00 0d 40 40 00 02 0000140 e8 e8 e8 40 40 40 40 40 02 40 40 40 00 40 40 40 0000160 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 * 0000240 02 c5 e2 c4 40 40 40 40 40 40 00 0d 40 40 00 03 0000260 e9 e9 e9 40 40 40 40 40 02 40 40 40 00 40 40 40 0000300 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 * 0000360 02 e3 e7 e3 40 00 00 00 40 40 00 10 40 40 00 01 0000400 00 00 00 04 00 00 00 04 00 00 00 04 00 00 00 04 0000420 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 * 0000500 02 e3 e7 e3 40 00 00 10 40 40 00 08 40 40 00 01 0000520 00 00 00 04 00 00 00 04 40 40 40 40 40 40 40 40 0000540 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 * 0000620 02 d9 d3 c4 40 40 40 40 40 40 00 08 40 40 40 40 0000640 00 03 00 01 0c 00 00 00 40 40 40 40 40 40 40 40 0000660 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 * 0000740 02 d9 d3 c4 40 40 40 40 40 40 00 08 40 40 40 40 0000760 00 02 00 01 0c 00 00 04 40 40 40 40 40 40 40 40 0001000 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 * 0001060 02 d9 d3 c4 40 40 40 40 40 40 00 08 40 40 40 40 0001100 00 03 00 01 0c 00 00 08 40 40 40 40 40 40 40 40 0001120 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 * 0001200 02 d9 d3 c4 40 40 40 40 40 40 00 08 40 40 40 40 0001220 00 02 00 01 0c 00 00 0c 40 40 40 40 40 40 40 40 0001240 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 * 0001320 02 d9 d3 c4 40 40 40 40 40 40 00 08 40 40 40 40 0001340 00 03 00 01 0c 00 00 10 40 40 40 40 40 40 40 40 0001360 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 * 0001440 02 d9 d3 c4 40 40 40 40 40 40 00 08 40 40 40 40 0001460 00 03 00 01 0c 00 00 10 40 40 40 40 40 40 40 40 0001500 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 * 0001560 02 d9 d3 c4 40 40 40 40 40 40 00 08 40 40 40 40 0001600 00 02 00 01 0c 00 00 14 40 40 40 40 40 40 40 40 0001620 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 * 0001700 02 d9 d3 c4 40 40 40 40 40 40 00 08 40 40 40 40 0001720 00 02 00 01 0c 00 00 14 40 40 40 40 40 40 40 40 0001740 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 * 0002020 02 c5 d5 c4 40 00 00 00 40 40 40 40 40 40 00 00 0002040 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 * 0002140 -----Original Message----- From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf Of Elardus Engelbrecht Sent: Wednesday, August 26, 2015 5:05 AM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: V constants Glen Hermannsfeldt wrote: >I assembled: >* test V constants > EXTRN XXX >XXX DC V(XXX+4) > END >with Z390. It assembled the 4 into the constant without any error or warning >message. Same with the EXTRN removed, or replaced by an ENTRY statement. Can you please post the result of XREF and LIST? It would be interesting to see the resultant assembly and their offsets. >A different question, is what does the linker do in this case? >For A constants, the linker adds the value assembled into the constant (the >offset). Where? I'm not sure what offset in what sections are you referring? I would like to compare that with Peter Relson's reply. Groete / Greetings Elardus Engelbrecht ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
