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vdso.7: Update for ARM 

The 32-bit ARM architecture in Linux has gained a vDSO as of the
4.1 release.  (I was the primary author.)

Document the symbols exported by the ARM VDSO.

Accepted kernel submission:
http://lists.infradead.org/pipermail/linux-arm-kernel/2015-March/332573.html

Acked-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Nathan Lynch <nathan_lynch@mentor.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Nathan Lynch 2015-06-01 14:48:59 -05:00 committed by Michael Kerrisk
parent be6b243ae2
commit ebfc361134
1 changed files with 20 additions and 1 deletions
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@ -148,6 +148,7 @@ l l.
user ABI vDSO name
_
aarch64 linux-vdso.so.1
arm linux-vdso.so.1
ia64 linux-gate.so.1
ppc/32 linux-vdso32.so.1
ppc/64 linux-vdso64.so.1
@ -175,9 +176,27 @@ an i386 32-bit kernel or under an x86_64 64-bit kernel.
Therefore, the name of the user-space ABI should be used to determine
which of the sections below is relevant.
.SS ARM functions
.\" See linux/arch/arm/vdso/vdso.lds.S
.\" Commit: 8512287a8165592466cb9cb347ba94892e9c56a5
The table below lists the symbols exported by the vDSO.
.if t \{\
.ft CW
\}
.TS
l l.
symbol version
_
__vdso_gettimeofday LINUX_2.6 (exported since Linux 4.1)
__vdso_clock_gettime LINUX_2.6 (exported since Linux 4.1)
.TE
.if t \{\
.in
.ft P
\}
.\" See linux/arch/arm/kernel/entry-armv.S
.\" See linux/Documentation/arm/kernel_user_helpers.txt
The ARM port has a code page full of utility functions.
Additionally, the ARM port has a code page full of utility functions.
Since it's just a raw page of code, there is no ELF information for doing
symbol lookups or versioning.
It does provide support for different versions though.