8.18.4 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.
This document was generated
by Guillaume Rousse on December, 12 2004
using texi2html