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| <h4 class="subsection">9.24.7 Directive to mark data as an instruction</h4> |
| |
| <p><a name="index-g_t_0040code_007b_002einsn_007d-1279"></a>The <code>.insn</code> directive tells <code>as</code> that the following |
| data is actually instructions. This makes a difference in MIPS 16 mode: |
| when loading the address of a label which precedes instructions, |
| <code>as</code> automatically adds 1 to the value, so that jumping to |
| the loaded address will do the right thing. |
| |
| <p><a name="index-g_t_0040code_007b_002eglobal_007d-1280"></a>The <code>.global</code> and <code>.globl</code> directives supported by |
| <code>as</code> will by default mark the symbol as pointing to a |
| region of data not code. This means that, for example, any |
| instructions following such a symbol will not be disassembled by |
| <code>objdump</code> as it will regard them as data. To change this |
| behaviour an optional section name can be placed after the symbol name |
| in the <code>.global</code> directive. If this section exists and is known |
| to be a code section, then the symbol will be marked as poiting at |
| code not data. Ie the syntax for the directive is: |
| |
| <p><code>.global </code><var>symbol</var><code>[ </code><var>section</var><code>][, </code><var>symbol</var><code>[ </code><var>section</var><code>]] ...</code>, |
| |
| <p>Here is a short example: |
| |
| <pre class="example"> .global foo .text, bar, baz .data |
| foo: |
| nop |
| bar: |
| .word 0x0 |
| baz: |
| .word 0x1 |
| |
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