AMODE instruction
The AMODE instruction specifies the addressing mode
associated with control sections in the object deck.
 >>-+------+--AMODE--+-24----+----------------------------------><
'-name-' +-31----+
+-64----+
+-ANY---+
+-ANY31-+
'-ANY64-'
|
- name
- is the name field that associates the addressing mode
with a control section,
or, if GOFF is specified, an ENTRY symbol or EXTRN symbol.
If GOFF is specified, AMODE can also associate an addressing
mode with an entry name.
If there is a symbol in the name field, it must
also appear in the name field of a START, CSECT, RSECT, or COM
instruction
or, if GOFF is specified, the operand of an ENTRY or EXTRN instruction,
in this assembly. If the name field is space-filled, there must be
an unnamed control section in this assembly. If the name field contains
a sequence symbol (see Symbols for details), it is treated as
a blank name field.
z/VM and z/OS
If the extended object format is being generated (GOFF assembler
option), name is
a relocatable symbol that names an entry point specified on an
ENTRY instruction,
or on an external symbol specified on an EXTRN
instruction.
End of z/VM and z/OS
- 24
- Specifies that 24-bit addressing mode is to be associated
with a control section, or entry point.
- 31
- Specifies that 31-bit addressing mode is to be associated
with a control section, or entry point.
- 64
- Specifies that 64-bit addressing mode is to be associated
with a control section, or entry point (see 64-bit Addressing Mode).
- ANY
- The same as ANY31.
- ANY31
- The control section or entry point is not sensitive to
whether it is entered in AMODE 24 or AMODE 31.
- ANY64
- The control section or entry point
is not sensitive to
whether it is entered in AMODE 24, AMODE 31, or AMODE 64.
Any field of this instruction may be generated by a macro, or by
substitution in open code.
If symbol denotes an ordinary symbol, the ordinary symbol
associates the addressing mode with
an external symbol. The ordinary
symbol must also appear in the name field of a START, CSECT, RSECT, or
COM instruction
or, if GOFF is specified, the operand of an ENTRY or EXTRN instruction,
in this assembly.
If symbol is not specified, or if name is a sequence
symbol, there must be an unnamed control section in this assembly.
Notes:
- AMODE can be specified anywhere in the assembly. It does not
initiate an unnamed control section.
- AMODE is permitted on external labels (EXTRNs) and Entry
labels for both GOFF formats and Parts for GOFF formats.
- An assembly can have multiple AMODE instructions; however, two AMODE
instructions cannot have the same name field.
- The valid and invalid combinations of AMODE and RMODE are shown in
the following table.
Note that combinations involving
AMODE 64 and RMODE 64
are subject to the support outlined in 64-bit Addressing Mode.
Table 11. AMODE/RMODE combinations
| |
RMODE 24 |
RMODE 31 |
RMODE 64 |
| AMODE 24 |
OK |
invalid |
invalid |
| AMODE 31 |
OK |
OK |
invalid |
| AMODE ANY|ANY31 |
OK |
OK |
invalid |
| AMODE 64|ANY64 |
OK |
OK |
OK |
- AMODE or RMODE
can only be specified for an unnamed control section
by specifying a sequence symbol or a space in the name field.
- The defaults used when there is no mode or one MODE
is specified are shown in the
following table.
Note that combinations involving
AMODE 64 and RMODE 64
are subject to the support outlined in 64-bit Addressing Mode.
Table 12. AMODE/RMODE defaults
| Specified |
Default |
| Neither |
AMODE 24, RMODE 24 |
| AMODE 24 |
RMODE 24 |
| AMODE 31 |
RMODE 24 |
| AMODE ANY|ANY31 |
RMODE 24 |
| RMODE 24 |
AMODE 24 |
| RMODE 31 (was ANY) |
AMODE 31 |
| AMODE 64 |
RMODE 31 |
| AMODE ANY64 |
RMODE 31 |
| RMODE 64 |
AMODE 64 |
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