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| <h4 class="subsection">9.22.4 Assembler Directives</h4> |
| |
| <p><a name="index-assembler-directives_002c-M68HC11-1221"></a><a name="index-assembler-directives_002c-M68HC12-1222"></a><a name="index-M68HC11-assembler-directives-1223"></a><a name="index-M68HC12-assembler-directives-1224"></a> |
| The 68HC11 and 68HC12 version of <code>as</code> have the following |
| specific assembler directives: |
| |
| <dl> |
| <dt><code>.relax</code><dd><a name="index-assembler-directive-_002erelax_002c-M68HC11-1225"></a><a name="index-M68HC11-assembler-directive-_002erelax-1226"></a>The relax directive is used by the ‘<samp><span class="samp">GNU Compiler</span></samp>’ 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. |
| |
| <br><dt><code>.mode [mshort|mlong|mshort-double|mlong-double]</code><dd><a name="index-assembler-directive-_002emode_002c-M68HC11-1227"></a><a name="index-M68HC11-assembler-directive-_002emode-1228"></a>This directive specifies the ABI. It overrides the ‘<samp><span class="samp">-mshort</span></samp>’, |
| ‘<samp><span class="samp">-mlong</span></samp>’, ‘<samp><span class="samp">-mshort-double</span></samp>’ and ‘<samp><span class="samp">-mlong-double</span></samp>’ options. |
| |
| <br><dt><code>.far </code><var>symbol</var><dd><a name="index-assembler-directive-_002efar_002c-M68HC11-1229"></a><a name="index-M68HC11-assembler-directive-_002efar-1230"></a>This directive marks the symbol as a ‘<samp><span class="samp">far</span></samp>’ symbol meaning that it |
| uses a ‘<samp><span class="samp">call/rtc</span></samp>’ calling convention as opposed to ‘<samp><span class="samp">jsr/rts</span></samp>’. |
| During a final link, the linker will identify references to the ‘<samp><span class="samp">far</span></samp>’ |
| symbol and will verify the proper calling convention. |
| |
| <br><dt><code>.interrupt </code><var>symbol</var><dd><a name="index-assembler-directive-_002einterrupt_002c-M68HC11-1231"></a><a name="index-M68HC11-assembler-directive-_002einterrupt-1232"></a>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. |
| |
| <br><dt><code>.xrefb </code><var>symbol</var><dd><a name="index-assembler-directive-_002exrefb_002c-M68HC11-1233"></a><a name="index-M68HC11-assembler-directive-_002exrefb-1234"></a>This directive is defined for compatibility with the |
| ‘<samp><span class="samp">Specification for Motorola 8 and 16-Bit Assembly Language Input |
| Standard</span></samp>’ and is ignored. |
| |
| </dl> |
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