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| Next: <a href="M68HC11_002dDirectives.html#M68HC11_002dDirectives" accesskey="n" rel="next">M68HC11-Directives</a>, Previous: <a href="M68HC11_002dSyntax.html#M68HC11_002dSyntax" accesskey="p" rel="prev">M68HC11-Syntax</a>, Up: <a href="M68HC11_002dDependent.html#M68HC11_002dDependent" accesskey="u" rel="up">M68HC11-Dependent</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="AS-Index.html#AS-Index" title="Index" rel="index">Index</a>]</p> |
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| <a name="Symbolic-Operand-Modifiers-1"></a> |
| <h4 class="subsection">9.24.3 Symbolic Operand Modifiers</h4> |
| |
| <a name="index-M68HC11-modifiers"></a> |
| <a name="index-syntax_002c-M68HC11-1"></a> |
| |
| <p>The assembler supports several modifiers when using symbol addresses |
| in 68HC11 and 68HC12 instruction operands. The general syntax is |
| the following: |
| </p> |
| <div class="smallexample"> |
| <pre class="smallexample">%modifier(symbol) |
| </pre></div> |
| |
| <dl compact="compact"> |
| <dd><a name="index-symbol-modifiers-3"></a> |
| </dd> |
| <dt><code>%addr</code></dt> |
| <dd><p>This modifier indicates to the assembler and linker to use |
| the 16-bit physical address corresponding to the symbol. This is intended |
| to be used on memory window systems to map a symbol in the memory bank window. |
| If the symbol is in a memory expansion part, the physical address |
| corresponds to the symbol address within the memory bank window. |
| If the symbol is not in a memory expansion part, this is the symbol address |
| (using or not using the %addr modifier has no effect in that case). |
| </p> |
| </dd> |
| <dt><code>%page</code></dt> |
| <dd><p>This modifier indicates to use the memory page number corresponding |
| to the symbol. If the symbol is in a memory expansion part, its page |
| number is computed by the linker as a number used to map the page containing |
| the symbol in the memory bank window. If the symbol is not in a memory |
| expansion part, the page number is 0. |
| </p> |
| </dd> |
| <dt><code>%hi</code></dt> |
| <dd><p>This modifier indicates to use the 8-bit high part of the physical |
| address of the symbol. |
| </p> |
| </dd> |
| <dt><code>%lo</code></dt> |
| <dd><p>This modifier indicates to use the 8-bit low part of the physical |
| address of the symbol. |
| </p> |
| </dd> |
| </dl> |
| |
| <p>For example a 68HC12 call to a function ‘<samp>foo_example</samp>’ stored in memory |
| expansion part could be written as follows: |
| </p> |
| <div class="smallexample"> |
| <pre class="smallexample">call %addr(foo_example),%page(foo_example) |
| </pre></div> |
| |
| <p>and this is equivalent to |
| </p> |
| <div class="smallexample"> |
| <pre class="smallexample">call foo_example |
| </pre></div> |
| |
| <p>And for 68HC11 it could be written as follows: |
| </p> |
| <div class="smallexample"> |
| <pre class="smallexample">ldab #%page(foo_example) |
| stab _page_switch |
| jsr %addr(foo_example) |
| </pre></div> |
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