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| <h4 class="subsection">9.38.4 RISC-V Object Attribute</h4> |
| |
| <p><a name="index-Object-Attribute_002c-RISC_002dV-2001"></a> |
| RISC-V attributes have a string value if the tag number is odd and an integer |
| value if the tag number is even. |
| |
| <dl> |
| <dt><span class="roman">Tag_RISCV_stack_align (4)</span><dd>Tag_RISCV_strict_align records the N-byte stack alignment for this object. The |
| default value is 16 for RV32I or RV64I, and 4 for RV32E. |
| |
| <p>The smallest value will be used if object files with different |
| Tag_RISCV_stack_align values are merged. |
| |
| <br><dt><span class="roman">Tag_RISCV_arch (5)</span><dd>Tag_RISCV_arch contains a string for the target architecture taken from the |
| option <samp><span class="option">-march</span></samp>. Different architectures will be integrated into a |
| superset when object files are merged. |
| |
| <p>Note that the version information of the target architecture must be presented |
| explicitly in the attribute and abbreviations must be expanded. The version |
| information, if not given by <samp><span class="option">-march</span></samp>, must be in accordance with the |
| default specified by the tool. For example, the architecture <code>RV32I</code> has |
| to be recorded in the attribute as <code>RV32I2P0</code> in which <code>2P0</code> stands |
| for the default version of its base ISA. On the other hand, the architecture |
| <code>RV32G</code> has to be presented as <code>RV32I2P0_M2P0_A2P0_F2P0_D2P0</code> in |
| which the abbreviation <code>G</code> is expanded to the <code>IMAFD</code> combination |
| with default versions of the standard extensions. |
| |
| <br><dt><span class="roman">Tag_RISCV_unaligned_access (6)</span><dd>Tag_RISCV_unaligned_access is 0 for files that do not allow any unaligned |
| memory accesses, and 1 for files that do allow unaligned memory accesses. |
| |
| <br><dt><span class="roman">Tag_RISCV_priv_spec (8)</span><br><dt><span class="roman">Tag_RISCV_priv_spec_minor (10)</span><br><dt><span class="roman">Tag_RISCV_priv_spec_revision (12)</span><dd>Tag_RISCV_priv_spec contains the major/minor/revision version information of |
| the privileged specification. It will report errors if object files of |
| different privileged specification versions are merged. |
| |
| </dl> |
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