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| <h4 class="subsection">21.4.9 Sparc64</h4> |
| |
| <p><a name="index-Sparc64-support-1644"></a><a name="index-Application-Data-Integrity-1645"></a> |
| |
| <h5 class="subsubsection">21.4.9.1 ADI Support</h5> |
| |
| <p>The M7 processor supports an Application Data Integrity (ADI) feature that |
| detects invalid data accesses. When software allocates memory and enables |
| ADI on the allocated memory, it chooses a 4-bit version number, sets the |
| version in the upper 4 bits of the 64-bit pointer to that data, and stores |
| the 4-bit version in every cacheline of that data. Hardware saves the latter |
| in spare bits in the cache and memory hierarchy. On each load and store, |
| the processor compares the upper 4 VA (virtual address) bits to the |
| cacheline's version. If there is a mismatch, the processor generates a |
| version mismatch trap which can be either precise or disrupting. The trap |
| is an error condition which the kernel delivers to the process as a SIGSEGV |
| signal. |
| |
| <p>Note that only 64-bit applications can use ADI and need to be built with |
| ADI-enabled. |
| |
| <p>Values of the ADI version tags, which are in granularity of a |
| cacheline (64 bytes), can be viewed or modified. |
| |
| |
| <a name="index-adi-examine-1646"></a> |
| <dl><dt><code>adi (examine | x) [ / </code><var>n</var><code> ] </code><var>addr</var><dd> |
| The <code>adi examine</code> command displays the value of one ADI version tag per |
| cacheline. |
| |
| <p><var>n</var> is a decimal integer specifying the number in bytes; the default |
| is 1. It specifies how much ADI version information, at the ratio of 1:ADI |
| block size, to display. |
| |
| <p><var>addr</var> is the address in user address space where you want <span class="sc">gdb</span> |
| to begin displaying the ADI version tags. |
| |
| <p>Below is an example of displaying ADI versions of variable "shmaddr". |
| |
| <pre class="smallexample"> (gdb) adi x/100 shmaddr |
| 0xfff800010002c000: 0 0 |
| </pre> |
| <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> |
| The <code>adi assign</code> command is used to assign new ADI version tag |
| to an address. |
| |
| <p><var>n</var> is a decimal integer specifying the number in bytes; |
| the default is 1. It specifies how much ADI version information, at the |
| ratio of 1:ADI block size, to modify. |
| |
| <p><var>addr</var> is the address in user address space where you want <span class="sc">gdb</span> |
| to begin modifying the ADI version tags. |
| |
| <p><var>tag</var> is the new ADI version tag. |
| |
| <p>For example, do the following to modify then verify ADI versions of |
| variable "shmaddr": |
| |
| <pre class="smallexample"> (gdb) adi a/100 shmaddr = 7 |
| (gdb) adi x/100 shmaddr |
| 0xfff800010002c000: 7 7 |
| </pre> |
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