The 68HC11 and 68HC12 version of as have the following
specific assembler directives:
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.
This directive specifies the ABI. It overrides the ‘-mshort’,
‘-mlong’, ‘-mshort-double’ and ‘-mlong-double’ options.
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.
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.
This directive is defined for compatibility with the
‘Specification for Motorola 8 and 16-Bit Assembly Language Input
Standard’ and is ignored.