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Use pointer authentication where applicable for function pointer casting

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Signed-off-by: Jeremy Huddleston Sequoia <jeremyhu@apple.com>
This commit is contained in:
Jeremy Huddleston Sequoia 2020-03-31 00:51:17 -07:00
parent 53ee6ff7fd
commit 1c99490e16
1 changed files with 6 additions and 0 deletions
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6
src/hotspot/share/utilities/globalDefinitions.hpp
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@ -417,8 +417,14 @@ inline size_t pointer_delta(const MetaWord* left, const MetaWord* right) {
// so far from the middle of the road that it is likely to be problematic in
// many C++ compilers.
//
#if __has_feature(ptrauth_calls)
#include <ptrauth.h>
#define CAST_TO_FN_PTR(func_type, value) (reinterpret_cast<func_type>(value ? ptrauth_sign_unauthenticated(ptrauth_strip((void *)value, ptrauth_key_function_pointer), ptrauth_key_function_pointer, 0) : NULL))
#define CAST_FROM_FN_PTR(new_type, func_ptr) ((new_type)((address_word)(ptrauth_strip((void *)func_ptr, ptrauth_key_function_pointer))))
#else
#define CAST_TO_FN_PTR(func_type, value) (reinterpret_cast<func_type>(value))
#define CAST_FROM_FN_PTR(new_type, func_ptr) ((new_type)((address_word)(func_ptr)))
#endif
// Unsigned byte types for os and stream.hpp