izzy/xenia-edge
0
0
Fork 0
mirror of https://github.com/izzy2lost/xenia-edge.git synced 2026-07-06 00:20:26 -07:00
Code Issues Packages Projects Releases Wiki Activity

[Base/macOS] Align ucontext_t copy in arm64 signal handler

Browse Source 
Co-Authored-By: Will Martin <wmarti@bu.edu>
This commit is contained in:
Herman S.
2026-04-20 15:30:43 +09:00
co-authored by Will Martin
parent 15b2689a00
commit aed6b765c8
1 changed files with 9 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/xenia/base/exception_handler_posix.cc
+9
View File
@@ -35,8 +35,17 @@ std::pair<ExceptionHandler::Handler, void*> handlers_[kMaxHandlerCount];
static void ExceptionHandlerCallback(int signal_number, siginfo_t* signal_info,
void* signal_context) {
#if XE_PLATFORM_MAC && XE_ARCH_ARM64
// The Darwin kernel may pass an unaligned ucontext_t pointer to signal
// handlers; copy into an aligned local before reading. mcontext_t is a
// pointer on Mac, so writes still reach kernel storage via the pointer.
alignas(16) ucontext_t ucontext_storage;
std::memcpy(&ucontext_storage, signal_context, sizeof(ucontext_t));
mcontext_t& mcontext = ucontext_storage.uc_mcontext;
#else
mcontext_t& mcontext =
reinterpret_cast<ucontext_t*>(signal_context)->uc_mcontext;
#endif
HostThreadContext thread_context;