[Bug libc/20079] New: Add SHT_X86_64_UNWIND to elf.h

["david.l.kreitzer at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=20079

            Bug ID: 20079
           Summary: Add SHT_X86_64_UNWIND to elf.h
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: david.l.kreitzer at gmail dot com
                CC: drepper.fsp at gmail dot com
  Target Milestone: ---

The x86_64 ABI defines SHT_X86_64_UNWIND as a processor-specific section type
with value 0x70000001. It is documented in section 4.2.2 here:

http://www.x86-64.org/documentation/abi.pdf

Recent versions of clang use this section type for .eh_frame, and this macro
will be useful for supporting this section type in various tools. This is the
bug I filed against elflint, that reports an error about an invalid section
type: https://bugzilla.redhat.com/show_bug.cgi?id=1335297.

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