The name entry in a machine or assembler instruction of the assembler
language
One of the operands of an EXTRN or WXTRN instruction
Ordinary symbols can also be defined in instructions generated
from model statements during conditional assembly.
In Figure 1, the assembler assigns a value to the ordinary symbol in
the name entry according to the following rules:
The symbol is assigned a relocatable address value if the first byte of the storage field
contains one of the following:
Any machine or assembler instruction, except the EQU or OPSYN instruction (see
1 in Figure 1). F004 is
the address of the area.
A storage area defined by the DS instruction (see 2 in Figure 1). Symbol AREA is 4 byte storage area at location counter
00000004.
Any constant defined by the DC instruction (see 3 in Figure 1). Symbol F200 is a 4 byte constant defined at
location counter 00000008, with the object code initialized to a value of
x'000000c8'.
The address value assigned is relocatable, because the object code assembled from these
items is relocatable. The relocatability of addresses is described in Addresses as machine instruction operands.
The symbol is assigned the value of the first or only expression specified in the operand of an
EQU instruction. This expression can have one of the following values, which is then assigned to the
ordinary symbol:
relocatable
See
4 in Figure 1. Symbols
FULL and TWO00 are relocatable symbols whose value is set by the
location counters of AREA and FULL respectively.
absolute
See
5 in Figure 1. Symbol R3
is an absolute symbol, whose value is 3.
See 6 in Figure 1. Statements 26, 27
illustrate the relocatable symbols being used. The object code and ADDR2 value show
the resolved values of the two relocatable symbols
The value of an ordinary absolute symbol
must lie in the range -231 through +231-1. Relocatable symbols have unsigned
address values in the range 0 - 224-1, or 0 - 231-1 if the GOFF option is
specified.
Figure 1. Transition from assembler language
statement to object code
LPSAMP04 Assembler source to Object code Page 4
Active Usings: None
Loc Object Code Addr1 Addr2 Stmt Source Statement HLASM R6.0 2015/02/24 13.32
00000000 00000000 00000014 16 LPSAMP04 CSECT
0000000E 17 R14 EQU 14
0000000F 18 R15 EQU 15
R:F 00000000 19 USING *,R15
00000000 5830 F004 00000004 20 LOAD L R3,AREA 1
00000004 00000000 21 AREA DS F'0' 2
00000008 000000C8 22 F200 DC F'200' 3
00000004 23 FULL EQU AREA 4
00000008 24 TWO00 EQU F200 4
00000003 25 R3 EQU 3 5
0000000C 5830 F004 00000004 26 6 L R3,FULL
00000010 5A30 F008 00000008 27 6 A R3,TWO00
28 END