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| <h4 class="subsection">9.7.1 Command-line Options</h4> |
| |
| <p><a name="index-options_002c-CRIS-696"></a><a name="index-CRIS-options-697"></a>The CRIS version of <code>as</code> has these |
| machine-dependent command-line options. |
| |
| <p><a name="index-g_t_0040option_007b_002d_002demulation_003dcriself_007d-command-line-option_002c-CRIS-698"></a><a name="index-g_t_0040option_007b_002d_002demulation_003dcrisaout_007d-command-line-option_002c-CRIS-699"></a><a name="index-CRIS-_0040option_007b_002d_002demulation_003dcriself_007d-command-line-option-700"></a><a name="index-CRIS-_0040option_007b_002d_002demulation_003dcrisaout_007d-command-line-option-701"></a> |
| The format of the generated object files can be either ELF or |
| a.out, specified by the command-line options |
| <samp><span class="option">--emulation=crisaout</span></samp> and <samp><span class="option">--emulation=criself</span></samp>. |
| The default is ELF (criself), unless <code>as</code> has been |
| configured specifically for a.out by using the configuration |
| name <code>cris-axis-aout</code>. |
| |
| <p><a name="index-g_t_0040option_007b_002d_002dunderscore_007d-command-line-option_002c-CRIS-702"></a><a name="index-g_t_0040option_007b_002d_002dno_002dunderscore_007d-command-line-option_002c-CRIS-703"></a><a name="index-CRIS-_0040option_007b_002d_002dunderscore_007d-command-line-option-704"></a><a name="index-CRIS-_0040option_007b_002d_002dno_002dunderscore_007d-command-line-option-705"></a>There are two different link-incompatible ELF object file |
| variants for CRIS, for use in environments where symbols are |
| expected to be prefixed by a leading ‘<samp><span class="samp">_</span></samp>’ character and for |
| environments without such a symbol prefix. The variant used for |
| GNU/Linux port has no symbol prefix. Which variant to produce |
| is specified by either of the options <samp><span class="option">--underscore</span></samp> and |
| <samp><span class="option">--no-underscore</span></samp>. The default is <samp><span class="option">--underscore</span></samp>. |
| Since symbols in CRIS a.out objects are expected to have a |
| ‘<samp><span class="samp">_</span></samp>’ prefix, specifying <samp><span class="option">--no-underscore</span></samp> when |
| generating a.out objects is an error. Besides the object format |
| difference, the effect of this option is to parse register names |
| differently (see <a href="crisnous.html#crisnous">crisnous</a>). The <samp><span class="option">--no-underscore</span></samp> |
| option makes a ‘<samp><span class="samp">$</span></samp>’ register prefix mandatory. |
| |
| <p><a name="index-g_t_0040option_007b_002d_002dpic_007d-command-line-option_002c-CRIS-706"></a><a name="index-CRIS-_0040option_007b_002d_002dpic_007d-command-line-option-707"></a><a name="index-Position_002dindependent-code_002c-CRIS-708"></a><a name="index-CRIS-position_002dindependent-code-709"></a>The option <samp><span class="option">--pic</span></samp> must be passed to <code>as</code> in |
| order to recognize the symbol syntax used for ELF (SVR4 PIC) |
| position-independent-code (see <a href="crispic.html#crispic">crispic</a>). This will also |
| affect expansion of instructions. The expansion with |
| <samp><span class="option">--pic</span></samp> will use PC-relative rather than (slightly |
| faster) absolute addresses in those expansions. |
| |
| <p><a name="index-g_t_0040option_007b_002d_002dmarch_003d_0040var_007barchitecture_007d_007d-command-line-option_002c-CRIS-710"></a><a name="index-CRIS-_0040option_007b_002d_002dmarch_003d_0040var_007barchitecture_007d_007d-command-line-option-711"></a><a name="index-Architecture-variant-option_002c-CRIS-712"></a><a name="index-CRIS-architecture-variant-option-713"></a>The option <samp><span class="option">--march=</span><var>architecture</var></samp> |
| <a name="march_002doption"></a>specifies the recognized instruction set |
| and recognized register names. It also controls the |
| architecture type of the object file. Valid values for |
| <var>architecture</var> are: |
| <dl> |
| <dt><code>v0_v10</code><dd>All instructions and register names for any architecture variant |
| in the set v0<small class="dots">...</small>v10 are recognized. This is the |
| default if the target is configured as cris-*. |
| |
| <br><dt><code>v10</code><dd>Only instructions and register names for CRIS v10 (as found in |
| ETRAX 100 LX) are recognized. This is the default if the target |
| is configured as crisv10-*. |
| |
| <br><dt><code>v32</code><dd>Only instructions and register names for CRIS v32 (code name |
| Guinness) are recognized. This is the default if the target is |
| configured as crisv32-*. This value implies |
| <samp><span class="option">--no-mul-bug-abort</span></samp>. (A subsequent |
| <samp><span class="option">--mul-bug-abort</span></samp> will turn it back on.) |
| |
| <br><dt><code>common_v10_v32</code><dd>Only instructions with register names and addressing modes with |
| opcodes common to the v10 and v32 are recognized. |
| </dl> |
| |
| <p><a name="index-g_t_0040option_007b_002dN_007d-command-line-option_002c-CRIS-714"></a><a name="index-CRIS-_0040option_007b_002dN_007d-command-line-option-715"></a>When <samp><span class="option">-N</span></samp> is specified, <code>as</code> will emit a |
| warning when a 16-bit branch instruction is expanded into a |
| 32-bit multiple-instruction construct (see <a href="CRIS_002dExpand.html#CRIS_002dExpand">CRIS-Expand</a>). |
| |
| <p><a name="index-g_t_0040option_007b_002d_002dno_002dmul_002dbug_002dabort_007d-command-line-option_002c-CRIS-716"></a><a name="index-g_t_0040option_007b_002d_002dmul_002dbug_002dabort_007d-command-line-option_002c-CRIS-717"></a><a name="index-CRIS-_0040option_007b_002d_002dno_002dmul_002dbug_002dabort_007d-command-line-option-718"></a><a name="index-CRIS-_0040option_007b_002d_002dmul_002dbug_002dabort_007d-command-line-option-719"></a> |
| Some versions of the CRIS v10, for example in the Etrax 100 LX, |
| contain a bug that causes destabilizing memory accesses when a |
| multiply instruction is executed with certain values in the |
| first operand just before a cache-miss. When the |
| <samp><span class="option">--mul-bug-abort</span></samp> command line option is active (the |
| default value), <code>as</code> will refuse to assemble a file |
| containing a multiply instruction at a dangerous offset, one |
| that could be the last on a cache-line, or is in a section with |
| insufficient alignment. This placement checking does not catch |
| any case where the multiply instruction is dangerously placed |
| because it is located in a delay-slot. The |
| <samp><span class="option">--mul-bug-abort</span></samp> command line option turns off the |
| checking. |
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