Itamar Medyoni 3168727fa4 fix(libc): call guest unwind callbacks with the System V ABI on Windows ...

_Unwind_Backtrace and _Unwind_ForcedUnwind call the trace and stop
functions a title passes them, and _Unwind_DeleteException calls the
exception_cleanup of the exception it deletes. Their types in
UnwindAbi.hpp had no APS5_VABI, so on Windows these guest functions were
called with the Microsoft x64 convention: the context and the argument
went to rcx and rdx while the guest reads rdi and rsi. vkQuake
(PPSA99010) imports _Unwind_Backtrace and reads each frame in its
callback (db3ec02c5).

The three types are now APS5_VABI, like the callbacks of __cxa_vec_ctor
and the other libc exports, and so is Cleanup, the exception_cleanup of
the exceptions libc throws. An exception thrown by libstdc++ on Windows
(class GNUCC++) has a host cleanup, so _Unwind_DeleteException passes it
to libgcc's _Unwind_DeleteException, which calls that cleanup as before.
Linux and macOS are unchanged.

2026-10-16 16:48:22 +03:00

..

gcc

feat(libc): operator new/delete, bounds-checked functions, char locale facets and runtime helpers

2026-09-28 14:22:48 +13:00

itanium

fix(libc): call guest unwind callbacks with the System V ABI on Windows

2026-10-16 16:48:22 +03:00

linux

refactor(libc): define the PROCMAP_QUERY permission flags in HostMapping

2026-10-11 07:44:34 -03:00