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| author | Peter Collingbourne <pcc@google.com> | 2018-11-06 16:39:13 -0800 |
|---|---|---|
| committer | Michael Bestas <mkbestas@lineageos.org> | 2019-12-23 23:43:40 +0200 |
| commit | 3d6ed948d991660254494856baabbf03e1915751 (patch) | |
| tree | a32ccbfc04898e0efc329c9e740a14c49dd2bc60 /kernel/sched/sched.h | |
| parent | e2495b88b595e304101a063cd9e28d9c17694d41 (diff) | |
FROMLIST: arm64: Build vDSO with -ffixed-x18
The vDSO needs to be build with x18 reserved in order to accommodate
userspace platform ABIs built on top of Linux that use the register
to carry inter-procedural state, as provided for by the AAPCS.
An example of such a platform ABI is the one that will be used by an
upcoming version of Android.
Although this change is currently a no-op due to the fact that the vDSO
is currently implemented in pure assembly on arm64, it is necessary
in order to prepare for another change [1] that will add C code to
the vDSO.
[1] https://patchwork.kernel.org/patch/10044501/
Change-Id: Icaac4b1c9127d81d754d3b8688274e9afc781760
Signed-off-by: Peter Collingbourne <pcc@google.com>
Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
Cc: Mark Salyzyn <salyzyn@google.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: linux-arm-kernel@lists.infradead.org
Diffstat (limited to 'kernel/sched/sched.h')
0 files changed, 0 insertions, 0 deletions