tree 79dbbf6b3f86a160dccfea4a45e19b6882a2b4a2
parent 2e46312ffd16982f0e991c9434d4908b107f5260
author Mikhail Maltsev <mikhail.maltsev@arm.com> 1560769221 +0000
committer Mikhail Maltsev <mikhail.maltsev@arm.com> 1560769221 +0000

[libunwind][AArch64] Fix libunwind::Registers_arm64::jumpto

Summary:
The AArch64 version of the libunwind function which restores the
CPU state and resumes execution is not interrupt-safe. It restores
the target value of SP before loading the floating-point registers
from the context struct, but that struct is allocated on the stack
which is being deallocated. This means that if an interrupt occurs
during this function, and uses a lot of stack space, it could
overwrite the values about to be loaded into the floating-point
registers.

This patch fixes the issue.

Patch by Oliver Stannard.

Reviewers: phosek, chill

Reviewed By: chill

Subscribers: chill, javed.absar, kristof.beyls, christof, LukeCheeseman, pbarrio, olista01, libcxx-commits

Tags: #libc

Differential Revision: https://reviews.llvm.org/D63006

llvm-svn: 363545