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| author | Vlad Tsyrklevich <vlad@tsyrklevich.net> | 2018-07-13 19:48:35 +0000 |
|---|---|---|
| committer | Vlad Tsyrklevich <vlad@tsyrklevich.net> | 2018-07-13 19:48:35 +0000 |
| commit | 5625d7ef61d8af9bb5eceb979738c88a07fddb24 (patch) | |
| tree | 5069d57871c60d906f2ff222a6fee3251875d8f0 /lib | |
| parent | 5291d19fa227cf4dcd8fb2a6d83a0fcb49214c5c (diff) | |
SafeStack: Add builtins to read unsafe stack top/bottom
Summary:
Introduce built-ins to read the unsafe stack top and bottom. The unsafe
stack top is required to implement garbage collection scanning for
Oilpan. Currently there is already a built-in 'get_unsafe_stack_start'
to read the bottom of the unsafe stack, but I chose to duplicate this
API because 'start' is ambiguous (e.g. Oilpan uses WTF::GetStackStart to
read the safe stack top.)
Reviewers: pcc
Reviewed By: pcc
Subscribers: llvm-commits, kcc
Differential Revision: https://reviews.llvm.org/D49152
git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@337037 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/safestack/safestack.cc | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/lib/safestack/safestack.cc b/lib/safestack/safestack.cc index 8b1fdb788..cc6d81b2e 100644 --- a/lib/safestack/safestack.cc +++ b/lib/safestack/safestack.cc @@ -257,11 +257,20 @@ __attribute__((section(".preinit_array"), #endif extern "C" - __attribute__((visibility("default"))) void *__get_unsafe_stack_start() { + __attribute__((visibility("default"))) void *__get_unsafe_stack_bottom() { return unsafe_stack_start; } extern "C" + __attribute__((visibility("default"))) void *__get_unsafe_stack_top() { + return (char*)unsafe_stack_start + unsafe_stack_size; +} + +extern "C" + __attribute__((visibility("default"), alias("__get_unsafe_stack_bottom"))) + void *__get_unsafe_stack_start(); + +extern "C" __attribute__((visibility("default"))) void *__get_unsafe_stack_ptr() { return __safestack_unsafe_stack_ptr; } |