https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110956
--- Comment #11 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Jeff Law <l...@gcc.gnu.org>: https://gcc.gnu.org/g:c46bded78f3733ad1312d141ebf1ae541032a48b commit r14-3154-gc46bded78f3733ad1312d141ebf1ae541032a48b Author: Thomas Neumann <thomas.neum...@in.tum.de> Date: Fri Aug 11 09:20:27 2023 -0600 preserve base pointer for __deregister_frame [PR110956] Original bug report: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110956 Rainer Orth successfully tested the patch on Solaris with a full bootstrap. Some uncommon unwinding table encodings need to access the base pointer for address computations. We do not have that information in calls to __deregister_frame_info_bases, and previously simply used nullptr as base pointer. That is usually fine, but for some Solaris i386 shared libraries that results in wrong address computations. To fix this problem we now associate the unwinding object with the table pointer itself, which is always known, in addition to the PC range. When deregistering a frame, we first locate the object using the table pointer, and then use the base pointer stored within the object to compute the PC range. libgcc/ChangeLog: PR libgcc/110956 * unwind-dw2-fde.c: Associate object with address of unwinding table.
