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| <title>用于 LLDB/C++ 调试的内核增强功能</title> |
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| <p> |
| Android 8.0 版本包含一些内核增强功能，可通过改善开发者的调试体验来帮助开发者打造出更好的应用。 |
| </p> |
| <p> |
| arm64 Android 内核支持在非 4/8 字节对齐的存储器地址上设置观察点，并报告对这些地址的所有访问。 |
| </p> |
| <h2 id="implementation">实现</h2> |
| <p> |
| 该功能可在任何 ARM 64 位设备上运行。可以选择添加对 32 位硬件/内核的支持。所有必要的内核修改都已完成。 |
| </p> |
| <p> |
| 当前的 3.10、3.18、4.4 和 4.9 内核分支包含此功能。 |
| 要将此功能添加到尚未包含它的内核中，请择优挑选必要的 CL 并加入到您的内核版本中。 |
| [Jack]kernel build?由于内核代码库会因随时间不断发展，补丁程序也会随之进行一些调整，因此请根据您的内核所基于的版本选择相应的补丁程序集： |
| </p> |
| |
| <ul> |
| <li>分支 android-3.10： |
| <ul> |
| <li><a href="https://android.googlesource.com/kernel/common/+/bb42e87236d9defb511819991df21d464c1ef2eb">https://android.googlesource.com/kernel/common/+/bb42e87236d9defb511819991df21d464c1ef2eb</a> |
| </li><li><a href="https://android.googlesource.com/kernel/common/+/e8e0018306e1b9426dd70b44f057d1555c212ffb">https://android.googlesource.com/kernel/common/+/e8e0018306e1b9426dd70b44f057d1555c212ffb</a> |
| </li><li><a href="https://android.googlesource.com/kernel/common/+/fc0e9d5d77d9368ab15a06f7e61fff2ae2bc254d">https://android.googlesource.com/kernel/common/+/fc0e9d5d77d9368ab15a06f7e61fff2ae2bc254d</a> |
| </li><li><a href="https://android.googlesource.com/kernel/common/+/482ff2ca45737ee4bab3cf7221f6df1c9e14ea2c">https://android.googlesource.com/kernel/common/+/482ff2ca45737ee4bab3cf7221f6df1c9e14ea2c</a> |
| </li></ul> |
| |
| </li><li>分支 android-3.18： |
| <ul> |
| <li><a href="https://android.googlesource.com/kernel/common/+/b14849ae202487251b91e9f89af7eda484a80489">https://android.googlesource.com/kernel/common/+/b14849ae202487251b91e9f89af7eda484a80489</a> |
| </li><li><a href="https://android.googlesource.com/kernel/common/+/58a9c1be1966ca89facba6343a5d8781154196b7">https://android.googlesource.com/kernel/common/+/58a9c1be1966ca89facba6343a5d8781154196b7</a> |
| </li><li><a href="https://android.googlesource.com/kernel/common/+/d34d016794f345c5f1dccf4060b1132439098699">https://android.googlesource.com/kernel/common/+/d34d016794f345c5f1dccf4060b1132439098699</a> |
| </li><li><a href="https://android.googlesource.com/kernel/common/+/c82e0fdadfba89cdb50c96af622c2c5ad6cb55eb">https://android.googlesource.com/kernel/common/+/c82e0fdadfba89cdb50c96af622c2c5ad6cb55eb</a> |
| </li></ul> |
| |
| </li><li>分支 android-4.4： |
| <ul> |
| <li><a href="https://android.googlesource.com/kernel/common/+/91495bc622e9356dd63a7c77b98a21f0e2f5d2b2">https://android.googlesource.com/kernel/common/+/91495bc622e9356dd63a7c77b98a21f0e2f5d2b2</a> |
| </li><li><a href="https://android.googlesource.com/kernel/common/+/7409857a0717fa78dc936ea08099880be893156c">https://android.googlesource.com/kernel/common/+/7409857a0717fa78dc936ea08099880be893156c</a> |
| </li><li><a href="https://android.googlesource.com/kernel/common/+/b48318f371e8a8b98238deac868bc7af8ed8ba4b">https://android.googlesource.com/kernel/common/+/b48318f371e8a8b98238deac868bc7af8ed8ba4b</a> |
| </li><li><a href="https://android.googlesource.com/kernel/common/+/edc166a8714b012a3dd207e437c772ae2a264eca">https://android.googlesource.com/kernel/common/+/edc166a8714b012a3dd207e437c772ae2a264eca</a> |
| </li></ul> |
| |
| </li><li>分支 android-4.9： |
| <ul> |
| <li><a href="https://android.googlesource.com/kernel/common/+/85c450ac7ac0a69aca4c6eb845e419ae092d8c86">https://android.googlesource.com/kernel/common/+/85c450ac7ac0a69aca4c6eb845e419ae092d8c86</a> |
| </li><li><a href="https://android.googlesource.com/kernel/common/+/67de4de5628a47fa794920745dc7869c97b558d3">https://android.googlesource.com/kernel/common/+/67de4de5628a47fa794920745dc7869c97b558d3</a> |
| </li><li><a href="https://android.googlesource.com/kernel/common/+/32649b0a393303a97fab6003c5757ff7b100331a">https://android.googlesource.com/kernel/common/+/32649b0a393303a97fab6003c5757ff7b100331a</a> |
| </li><li><a href="https://android.googlesource.com/kernel/common/+/d32793b6be517dffa29329a92ffcc688e74bc690">https://android.googlesource.com/kernel/common/+/d32793b6be517dffa29329a92ffcc688e74bc690</a></li> |
| </ul> |
| </li></ul> |
| |
| <p> |
| 此功能实现了 <code>ptrace</code> API 扩展，可支持编写调试程序。 |
| </p> |
| <h2 id="validation">验证</h2> |
| <p> |
| 上游代码库中有一个内核自测（即 CTS 测试），并且有用于测试新内核 API 而添加的 CTS 测试： |
| </p> |
| <p> |
| <a href="https://android.googlesource.com/platform/bionic/+/master/tests/sys_ptrace_test.cpp">https://android.googlesource.com/platform/bionic/+/master/tests/sys_ptrace_test.cpp</a> |
| </p> |
| |
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