Motorola M88K Dependent Features
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M88K Machine Directives
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The M88K version of the assembler supports the following machine directives:

.align
     This directive aligns the section program counter on the next 4-byte boundary.

.dfloat EXPR
     This assembles a double precision (64-bit) floating point constant.

.ffloat EXPR
     This assembles a single precision (32-bit) floating point constant.

.half EXPR
     This directive assembles a half-word (16-bit) constant.

.word EXPR
     This assembles a word (32-bit) constant.

.string "STR"
     This directive behaves like the standard .ascii directive for copying STR into the object file.  The string is not terminated with a null byte.

.set SYMBOL, VALUE
     This directive creates a symbol named SYMBOL which is an alias for another symbol (possibly not yet defined).  This should not be confused with the mnemonic set, which is a legitimate M88K instruction.

.def SYMBOL, VALUE
     This directive is synonymous with .set and is presumably provided for compatibility with other M88K assemblers.

.bss SYMBOL, LENGTH, ALIGN
     Reserve LENGTH bytes in the bss section for a local SYMBOL, aligned to the power of two specified by ALIGN.  LENGTH and ALIGN must be positive absolute expressions.  This directive differs from .lcomm only in that it permits you to specify an alignment.  See .lcomm.