1 What: vDSO
2 Date: July 2011
3 KernelVersion: 3.0
4 Contact: Andy Lutomirski <luto@kernel.or
5 Description:
6
7 On some architectures, when the kernel loads a
8 maps an ELF DSO into that program's address sp
9 the vDSO and it often contains useful and high
10 to real syscalls.
11
12 These functions are called according to your p
13 platforms they are called just like ordinary C
14 (ex: powerpc) they are called with the same co
15 is different from ordinary C functions. Call t
16 (For example, if you set CS on x86 to somethin
17 within their rights to crash.) In addition, i
18 pointer to a vDSO function, you might get SIGS
19
20 To find the DSO, parse the auxiliary vector pa
21 entry point. The AT_SYSINFO_EHDR entry will p
22
23 The vDSO uses symbol versioning; whenever you
24 vDSO, specify the version you are expecting.
25
26 Programs that dynamically link to glibc will u
27 Otherwise, you can use the reference parser in
28 tools/testing/selftests/vDSO/parse_vdso.c.
29
30 Unless otherwise noted, the set of symbols wit
31 ABI of those symbols is considered stable. It
32 though.
33
34 Note:
35 As of this writing, this ABI documentation as
36 The maintainers of the other vDSO-using archi
37 that it is correct for their architecture.
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.