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<title>Debugging with GDB: Sparc64</title>
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<a name="Sparc64"></a>
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<div class="header">
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<p>
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Next: <a href="S12Z.html#S12Z" accesskey="n" rel="next">S12Z</a>, Previous: <a href="Nios-II.html#Nios-II" accesskey="p" rel="previous">Nios II</a>, Up: <a href="Architectures.html#Architectures" accesskey="u" rel="up">Architectures</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
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<hr>
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<a name="Sparc64-1"></a>
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<h4 class="subsection">21.4.8 Sparc64</h4>
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<a name="index-Sparc64-support"></a>
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<a name="index-Application-Data-Integrity"></a>
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<a name="ADI-Support"></a>
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<h4 class="subsubsection">21.4.8.1 ADI Support</h4>
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<p>The M7 processor supports an Application Data Integrity (ADI) feature that
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detects invalid data accesses. When software allocates memory and enables
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ADI on the allocated memory, it chooses a 4-bit version number, sets the
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version in the upper 4 bits of the 64-bit pointer to that data, and stores
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the 4-bit version in every cacheline of that data. Hardware saves the latter
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in spare bits in the cache and memory hierarchy. On each load and store,
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the processor compares the upper 4 VA (virtual address) bits to the
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cacheline’s version. If there is a mismatch, the processor generates a
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version mismatch trap which can be either precise or disrupting. The trap
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is an error condition which the kernel delivers to the process as a SIGSEGV
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signal.
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</p>
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<p>Note that only 64-bit applications can use ADI and need to be built with
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ADI-enabled.
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</p>
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<p>Values of the ADI version tags, which are in granularity of a
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cacheline (64 bytes), can be viewed or modified.
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</p>
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<dl compact="compact">
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<dd><a name="index-adi-examine"></a>
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</dd>
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<dt><code>adi (examine | x) [ / <var>n</var> ] <var>addr</var></code></dt>
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<dd>
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<p>The <code>adi examine</code> command displays the value of one ADI version tag per
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cacheline.
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</p>
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<p><var>n</var> is a decimal integer specifying the number in bytes; the default
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is 1. It specifies how much ADI version information, at the ratio of 1:ADI
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block size, to display.
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</p>
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<p><var>addr</var> is the address in user address space where you want <small>GDB</small>
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to begin displaying the ADI version tags.
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</p>
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<p>Below is an example of displaying ADI versions of variable "shmaddr".
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</p>
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<div class="smallexample">
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<pre class="smallexample">(gdb) adi x/100 shmaddr
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0xfff800010002c000: 0 0
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</pre></div>
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<a name="index-adi-assign"></a>
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</dd>
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<dt><code>adi (assign | a) [ / <var>n</var> ] <var>addr</var> = <var>tag</var></code></dt>
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<dd>
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<p>The <code>adi assign</code> command is used to assign new ADI version tag
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to an address.
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</p>
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<p><var>n</var> is a decimal integer specifying the number in bytes;
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the default is 1. It specifies how much ADI version information, at the
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ratio of 1:ADI block size, to modify.
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</p>
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<p><var>addr</var> is the address in user address space where you want <small>GDB</small>
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to begin modifying the ADI version tags.
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</p>
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<p><var>tag</var> is the new ADI version tag.
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</p>
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<p>For example, do the following to modify then verify ADI versions of
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variable "shmaddr":
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</p>
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<div class="smallexample">
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<pre class="smallexample">(gdb) adi a/100 shmaddr = 7
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(gdb) adi x/100 shmaddr
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0xfff800010002c000: 7 7
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</pre></div>
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</dd>
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</dl>
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Next: <a href="S12Z.html#S12Z" accesskey="n" rel="next">S12Z</a>, Previous: <a href="Nios-II.html#Nios-II" accesskey="p" rel="previous">Nios II</a>, Up: <a href="Architectures.html#Architectures" accesskey="u" rel="up">Architectures</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
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