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From: "jkain at nvidia dot com" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug backtrace/15032] GNU/Linux backtrace fails to use eh_frame
 information when built with --enable-64-bit-bfd
Date: Fri, 18 Jan 2013 20:29:00 -0000
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http://sourceware.org/bugzilla/show_bug.cgi?id=15032

--- Comment #2 from Joseph Kain <jkain at nvidia dot com> 2013-01-18 20:29:40 UTC ---
> couldn't you provide some such 32-bit binary?

I'll see if I can prepare such a 32 bit binary.  At the moment I don't have a
releaseable version as I was in the process of adding missing .eh_frame data to
the binary when I discocvered this problem.

> The problem is 0xfff7bb90 should have been 64-bit extended as 
> 0xfffffffffff7bb90 and then it would all work.

The DW_EH_PE_udata4 case won't sign extend as it's supposed to represent
unsigned data.  I believe, the DW_EH_PE_udata4 case was selected in the block


  if ((encoding & 0x07) == 0x00)
    {
      encoding |= encoding_for_size (ptr_len);
      if (bfd_get_sign_extend_vma (unit->abfd))
    encoding |= DW_EH_PE_signed;
    }

Clearly, DW_EH_PE_signed wasn't set.  I can try to look into why.

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