https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: 009d0431c3914de64666bec0d350e54fdd59df6a authored by Linus Torvalds on 01 December 2014, 00:42:27 UTC
Linux 3.18-rc7
Linux 3.18-rc7
Tip revision: 009d043
tagged-pointers.txt
Chinese translated version of Documentation/arm64/tagged-pointers.txt
If you have any comment or update to the content, please contact the
original document maintainer directly. However, if you have a problem
communicating in English you can also ask the Chinese maintainer for
help. Contact the Chinese maintainer if this translation is outdated
or if there is a problem with the translation.
Maintainer: Will Deacon <will.deacon@arm.com>
Chinese maintainer: Fu Wei <wefu@redhat.com>
---------------------------------------------------------------------
Documentation/arm64/tagged-pointers.txt 的中文翻译
如果想评论或更新本文的内容,请直接联系原文档的维护者。如果你使用英文
交流有困难的话,也可以向中文版维护者求助。如果本翻译更新不及时或者翻
译存在问题,请联系中文版维护者。
英文版维护者: Will Deacon <will.deacon@arm.com>
中文版维护者: 傅炜 Fu Wei <wefu@redhat.com>
中文版翻译者: 傅炜 Fu Wei <wefu@redhat.com>
中文版校译者: 傅炜 Fu Wei <wefu@redhat.com>
以下为正文
---------------------------------------------------------------------
Linux 在 AArch64 中带标记的虚拟地址
=================================
作者: Will Deacon <will.deacon@arm.com>
日期: 2013 年 06 月 12 日
本文档简述了在 AArch64 地址转换系统中提供的带标记的虚拟地址及其在
AArch64 Linux 中的潜在用途。
内核提供的地址转换表配置使通过 TTBR0 完成的虚拟地址转换(即用户空间
映射),其虚拟地址的最高 8 位(63:56)会被转换硬件所忽略。这种机制
让这些位可供应用程序自由使用,其注意事项如下:
(1) 内核要求所有传递到 EL1 的用户空间地址带有 0x00 标记。
这意味着任何携带用户空间虚拟地址的系统调用(syscall)
参数 *必须* 在陷入内核前使它们的最高字节被清零。
(2) 非零标记在传递信号时不被保存。这意味着在应用程序中利用了
标记的信号处理函数无法依赖 siginfo_t 的用户空间虚拟
地址所携带的包含其内部域信息的标记。此规则的一个例外是
当信号是在调试观察点的异常处理程序中产生的,此时标记的
信息将被保存。
(3) 当使用带标记的指针时需特别留心,因为仅对两个虚拟地址
的高字节,C 编译器很可能无法判断它们是不同的。
此构架会阻止对带标记的 PC 指针的利用,因此在异常返回时,其高字节
将被设置成一个为 “55” 的扩展符。