[libunwind] Handle .ARM.exidx tables without sentinel last entry

UnwindCursor<A, R>::getInfoFromEHABISection assumes the last
entry in the index table never corresponds to a real function.
Indeed, GNU ld always inserts an EXIDX_CANTUNWIND entry,
containing the end of the .text section. However, the EHABI specification
(http://infocenter.arm.com/help/topic/com.arm.doc.ihi0038b/IHI0038B_ehabi.pdf)
does not seem to contain text that requires the presence of a sentinel entry.
In that sense the libunwind implementation isn't compliant with the specification.

This patch makes getInfoFromEHABISection examine the last entry in the index
table if upper_bound returns the end iterator.

Fixes https://bugs.llvm.org/show_bug.cgi?id=31091

Differential revision: https://reviews.llvm.org/D35265


git-svn-id: https://llvm.org/svn/llvm-project/libunwind/trunk@308871 91177308-0d34-0410-b5e6-96231b3b80d8

0 files changed, 0 insertions, 0 deletions