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115 lines
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<title>Sparc64 - Debugging with GDB</title>
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<a name="Sparc64"></a>
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Next: <a rel="next" accesskey="n" href="S12Z.html#S12Z">S12Z</a>,
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Previous: <a rel="previous" accesskey="p" href="Nios-II.html#Nios-II">Nios II</a>,
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Up: <a rel="up" accesskey="u" href="Architectures.html#Architectures">Architectures</a>
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<h4 class="subsection">21.4.9 Sparc64</h4>
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<p><a name="index-Sparc64-support-1644"></a><a name="index-Application-Data-Integrity-1645"></a>
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<h5 class="subsubsection">21.4.9.1 ADI Support</h5>
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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>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>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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<a name="index-adi-examine-1646"></a>
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<dl><dt><code>adi (examine | x) [ / </code><var>n</var><code> ] </code><var>addr</var><dd>
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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><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><var>addr</var> is the address in user address space where you want <span class="sc">gdb</span>
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to begin displaying the ADI version tags.
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<p>Below is an example of displaying ADI versions of variable "shmaddr".
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<pre class="smallexample"> (gdb) adi x/100 shmaddr
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0xfff800010002c000: 0 0
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</pre>
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<p><a name="index-adi-assign-1647"></a><br><dt><code>adi (assign | a) [ / </code><var>n</var><code> ] </code><var>addr</var><code> = </code><var>tag</var><dd>
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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><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><var>addr</var> is the address in user address space where you want <span class="sc">gdb</span>
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to begin modifying the ADI version tags.
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<p><var>tag</var> is the new ADI version tag.
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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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<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>
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</dl>
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</body></html>
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