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Merge from head

Sponsored by: Gandi.net

Merge from head

Sync up with head up to r289211.

Merge ^/head r288197 through r288456.

Merge from head

Annotate arm userspace assembler sources stating their tolerance to
the non-executable stack.

Reviewed by: andrew
Sponsored by: The FreeBSD Foundation

IFC @r269962

Submitted by: Anish Gupta (akgupt3@gmail.com)

Merge head from 7/28

Sync to HEAD@r269943.

Align the stack in _rtld_bind_start. Normally this is called with the
correct stack alignment, however when we have a leaf function that uses
thread local storage it calls __aeabi_read_tp to get the

Align the stack in _rtld_bind_start. Normally this is called with the
correct stack alignment, however when we have a leaf function that uses
thread local storage it calls __aeabi_read_tp to get the thread pointer.
Neither GCC or clang see this as a function call so will align the stack
to a 4-byte boundary. This may be a problem as _rtld_bind expects to be
on an 8-byte boundary.

The solution is to store a copy of the stack pointer and force the
alignment before calling _rtld_bind.

This fixes a problem with armeb where applications would crash in odd ways.
It should also remove the need for a local patch to clang to force the
stack alignment to an 8-byte boundary, even for leaf functions. Further
testing will be needed before reverting this local change to clang as we
may rely on it in other places.

Reviewed by: jmg@

show more ...

MFC @ r241285

IFC @ r242684

Sync from head

Merge head r233826 through r239173.

Ensure we align the stack to 8 bytes in rtld.

This is not strictly required with the current ABI but will be when we
switch to the ARM EABI. The aapcs requires the stack to be 4 byte aligned
at all

Ensure we align the stack to 8 bytes in rtld.

This is not strictly required with the current ABI but will be when we
switch to the ARM EABI. The aapcs requires the stack to be 4 byte aligned
at all times and 8 byte aligned when calling a public subroutine where the
current ABI only requires sp to be a multiple of 4.

show more ...

Merge from head

Sponsored by: Gandi.net

Merge from head

Sync up with head up to r289211.

Merge ^/head r288197 through r288456.

Merge from head

Annotate arm userspace assembler sources stating their tolerance to
the non-executable stack.

Reviewed by: andrew
Sponsored by: The FreeBSD Foundation

IFC @r269962

Submitted by: Anish Gupta (akgupt3@gmail.com)

Merge head from 7/28