ARM Machine Directives

.code [16|32]

This directive selects the instruction set being generated. The value 16 selects Thumb, with the value 32 selecting ARM.

.thumb

This performs the same action as .code 16.

.arm

This performs the same action as .code 32.

.force_thumb

This directive forces the selection of Thumb instructions, even if the target processor does not support those instructions

.thumb_func

This directive specifies that the following symbol is the name of a Thumb encoded function. This information is necessary in order to allow the assembler and linker to generate correct code for interworking between Arm and Thumb instructions and should be used even if interworking is not going to be performed.

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