[Bug gas/27688] New: gas does not support .secidx pseudo-directive

[mark at harmstone dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=27688

            Bug ID: 27688
           Summary: gas does not support .secidx pseudo-directive
           Product: binutils
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gas
          Assignee: unassigned at sourceware dot org
          Reporter: mark at harmstone dot com
  Target Milestone: ---

Created attachment 13345
  --> https://sourceware.org/bugzilla/attachment.cgi?id=13345&action=edit
secidx patch

llvm-mc has a pseudo-directive .secidx for COFF files, which maps to a
IMAGE_REL_I386_SECTION / IMAGE_REL_AMD64_SECTION relocation entry. This is a
two-byte field which gets set to the section index of a label when it's linked.

This is necessary for support for CodeView / PDB debugging, as addresses are
represented by a two-byte section index and a four-byte offset (i.e. a .secidx
and a .secrel32). See also my CodeView patches to the gcc mailing list, which
rely on this to work.

I've attached a patch, which implements this for x86 and amd64.

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