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-On some architectures, when the kernel loads any userspace program it
-maps an ELF DSO into that program's address space. This DSO is called
-the vDSO and it often contains useful and highly-optimized alternatives
-to real syscalls.
-These functions are called just like ordinary C function according to
-your platform's ABI. Call them from a sensible context. (For example,
-if you set CS on x86 to something strange, the vDSO functions are
-within their rights to crash.) In addition, if you pass a bad
-pointer to a vDSO function, you might get SIGSEGV instead of -EFAULT.
-To find the DSO, parse the auxiliary vector passed to the program's
-entry point. The AT_SYSINFO_EHDR entry will point to the vDSO.
-The vDSO uses symbol versioning; whenever you request a symbol from the
-vDSO, specify the version you are expecting.
-Programs that dynamically link to glibc will use the vDSO automatically.
-Otherwise, you can use the reference parser in Documentation/vDSO/parse_vdso.c.
-Unless otherwise noted, the set of symbols with any given version and the
-ABI of those symbols is considered stable. It may vary across architectures,
-(As of this writing, this ABI documentation as been confirmed for x86_64.
- The maintainers of the other vDSO-using architectures should confirm
- that it is correct for their architecture.) \ No newline at end of file