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3 Commits

Author SHA1 Message Date
Anna Zaks
59203823d7 [safestack] Make sure the unsafe stack pointer is popped in all cases 
The unsafe stack pointer is only popped in moveStaticAllocasToUnsafeStack so it won't happen if there are no static allocas.

Fixes https://llvm.org/bugs/show_bug.cgi?id=26122

Differential Revision: http://reviews.llvm.org/D16339

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@259447 91177308-0d34-0410-b5e6-96231b3b80d8
 2016-02-02 01:03:11 +00:00
Evgeniy Stepanov
b7afd4e7e9 [safestack] Fix compiler crash in the presence of stack restores. 
A use can be emitted before def in a function with stack restore
points but no static allocas.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@248455 91177308-0d34-0410-b5e6-96231b3b80d8
 2015-09-24 01:23:51 +00:00
Evgeniy Stepanov
d4052cf84c Android support for SafeStack. 
Add two new ways of accessing the unsafe stack pointer:

* At a fixed offset from the thread TLS base. This is very similar to
  StackProtector cookies, but we plan to extend it to other backends
  (ARM in particular) soon. Bionic-side implementation here:
  https://android-review.googlesource.com/170988.
* Via a function call, as a fallback for platforms that provide
  neither a fixed TLS slot, nor a reasonable TLS implementation (i.e.
  not emutls).

This is a re-commit of a change in r248357 that was reverted in
r248358.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@248405 91177308-0d34-0410-b5e6-96231b3b80d8
 2015-09-23 18:07:56 +00:00