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Arm Compiler armasm User Guide : About the Unified Assembler Language

About the Unified Assembler Language

Unified Assembler Language (UAL) is a common syntax for A32 and T32 instructions. It supersedes earlier versions of both the A32 and T32 assembler languages.

Code that is written using UAL can be assembled for A32 or T32 for any Arm® processor. armasm faults the use of unavailable instructions.

armasm can assemble code that is written in pre-UAL and UAL syntax.

By default, armasm expects source code to be written in UAL. armasm accepts UAL syntax if any of the directives CODE32, ARM, or THUMB is used or if you assemble with any of the --32, --arm, or --thumb command-line options. armasm also accepts source code that is written in pre-UAL A32 assembly language when you assemble with the CODE32 or ARM directive.

armasm accepts source code that is written in pre-UAL T32 assembly language when you assemble using the --16 command-line option, or the CODE16 directive in the source code.

Note

The pre-UAL T32 assembly language does not support 32-bit T32 instructions.
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