| <html lang="en"> |
| <head> |
| <title>AArch64 - Debugging with GDB</title> |
| <meta http-equiv="Content-Type" content="text/html"> |
| <meta name="description" content="Debugging with GDB"> |
| <meta name="generator" content="makeinfo 4.13"> |
| <link title="Top" rel="start" href="index.html#Top"> |
| <link rel="up" href="Architectures.html#Architectures" title="Architectures"> |
| <link rel="next" href="i386.html#i386" title="i386"> |
| <link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage"> |
| <!-- |
| Copyright (C) 1988-2019 Free Software Foundation, Inc. |
| |
| Permission is granted to copy, distribute and/or modify this document |
| under the terms of the GNU Free Documentation License, Version 1.3 or |
| any later version published by the Free Software Foundation; with the |
| Invariant Sections being ``Free Software'' and ``Free Software Needs |
| Free Documentation'', with the Front-Cover Texts being ``A GNU Manual,'' |
| and with the Back-Cover Texts as in (a) below. |
| |
| (a) The FSF's Back-Cover Text is: ``You are free to copy and modify |
| this GNU Manual. Buying copies from GNU Press supports the FSF in |
| developing GNU and promoting software freedom.'' |
| --> |
| <meta http-equiv="Content-Style-Type" content="text/css"> |
| <style type="text/css"><!-- |
| pre.display { font-family:inherit } |
| pre.format { font-family:inherit } |
| pre.smalldisplay { font-family:inherit; font-size:smaller } |
| pre.smallformat { font-family:inherit; font-size:smaller } |
| pre.smallexample { font-size:smaller } |
| pre.smalllisp { font-size:smaller } |
| span.sc { font-variant:small-caps } |
| span.roman { font-family:serif; font-weight:normal; } |
| span.sansserif { font-family:sans-serif; font-weight:normal; } |
| --></style> |
| </head> |
| <body> |
| <div class="node"> |
| <a name="AArch64"></a> |
| <p> |
| Next: <a rel="next" accesskey="n" href="i386.html#i386">i386</a>, |
| Up: <a rel="up" accesskey="u" href="Architectures.html#Architectures">Architectures</a> |
| <hr> |
| </div> |
| |
| <h4 class="subsection">21.4.1 AArch64</h4> |
| |
| <p><a name="index-AArch64-support-1603"></a> |
| When <span class="sc">gdb</span> is debugging the AArch64 architecture, it provides the |
| following special commands: |
| |
| <dl> |
| <dt><code>set debug aarch64</code><dd><a name="index-set-debug-aarch64-1604"></a>This command determines whether AArch64 architecture-specific debugging |
| messages are to be displayed. |
| |
| <br><dt><code>show debug aarch64</code><dd>Show whether AArch64 debugging messages are displayed. |
| |
| </dl> |
| |
| <h5 class="subsubsection">21.4.1.1 AArch64 SVE.</h5> |
| |
| <p><a name="index-AArch64-SVE_002e-1605"></a> |
| When <span class="sc">gdb</span> is debugging the AArch64 architecture, if the Scalable Vector |
| Extension (SVE) is present, then <span class="sc">gdb</span> will provide the vector registers |
| <code>$z0</code> through <code>$z31</code>, vector predicate registers <code>$p0</code> through |
| <code>$p15</code>, and the <code>$ffr</code> register. In addition, the pseudo register |
| <code>$vg</code> will be provided. This is the vector granule for the current thread |
| and represents the number of 64-bit chunks in an SVE <code>z</code> register. |
| |
| <p>If the vector length changes, then the <code>$vg</code> register will be updated, |
| but the lengths of the <code>z</code> and <code>p</code> registers will not change. This |
| is a known limitation of <span class="sc">gdb</span> and does not affect the execution of the |
| target process. |
| |
| </body></html> |
| |
