M68HC11-Directives - Using as
Description: Using as

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#### 9.22.4 Assembler Directives

The 68HC11 and 68HC12 version of `as` have the following specific assembler directives:

`.relax`
  The relax directive is used by the ‘`GNU Compiler`’ to emit a specific relocation to mark a group of instructions for linker relaxation. The sequence of instructions within the group must be known to the linker so that relaxation can be performed.
`.mode [mshort|mlong|mshort-double|mlong-double]`
  This directive specifies the ABI. It overrides the ‘`-mshort`’, ‘`-mlong`’, ‘`-mshort-double`’ and ‘`-mlong-double`’ options.
`.far` symbol
  This directive marks the symbol as a ‘`far`’ symbol meaning that it uses a ‘`call/rtc`’ calling convention as opposed to ‘`jsr/rts`’. During a final link, the linker will identify references to the ‘`far`’ symbol and will verify the proper calling convention.
`.interrupt` symbol
  This directive marks the symbol as an interrupt entry point. This information is then used by the debugger to correctly unwind the frame across interrupts.
`.xrefb` symbol
  This directive is defined for compatibility with the ‘`Specification for Motorola 8 and 16-Bit Assembly Language Input Standard`’ and is ignored.