8.19.4 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.