[Bug backtrace/15032] GNU/Linux backtrace fails to use eh_frameinformation when built with --enable-64-bit-bfd

["jkain at nvidia dot com" <sourceware-bugzilla at sourceware dot org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=15032

--- Comment #5 from Joseph Kain <jkain at nvidia dot com> 2013-01-18 21:42:28 UTC ---
Sorry, I think I've left out some important information.

Using the values from my last update we have read_encoded_value returning an
initial_location of 0x10003b980.  Where the correct value should be 0x3b980.  I
know this value is correct because I have confirmed it as the VMA of the .text
section which is where the initial value for the first FDE would be expected to
point.

The value read by bfd_read_32() in the DW_EH_PE_udata4 case must be a negative
value like 0xfff7bbe0 as pc relative address is being used and the .eh_frame
section comes after the .text section.  I've included the section header dump
from objdump -x below.

Sections:
Idx Name          Size      VMA       LMA       File off  Algn
  0 .hash         000044d8  000000b4  000000b4  000000b4  2**2
                  CONTENTS, ALLOC, LOAD, READONLY, DATA
  1 .dynsym       000092f0  0000458c  0000458c  0000458c  2**2
                  CONTENTS, ALLOC, LOAD, READONLY, DATA
  2 .dynstr       0000b32a  0000d87c  0000d87c  0000d87c  2**0
                  CONTENTS, ALLOC, LOAD, READONLY, DATA
  3 .gnu.version  0000125e  00018ba6  00018ba6  00018ba6  2**1
                  CONTENTS, ALLOC, LOAD, READONLY, DATA
  4 .gnu.version_r 00000070  00019e04  00019e04  00019e04  2**2
                  CONTENTS, ALLOC, LOAD, READONLY, DATA
  5 .rel.dyn      00021b00  00019e74  00019e74  00019e74  2**2
                  CONTENTS, ALLOC, LOAD, READONLY, DATA
  6 .text         00068858  0003b980  0003b980  0003b980  2**4
                  CONTENTS, ALLOC, LOAD, READONLY, CODE
  7 .rodata       0001bba0  000a41e0  000a41e0  000a41e0  2**5
                  CONTENTS, ALLOC, LOAD, READONLY, DATA
  8 .eh_frame     00010d54  000bfd80  000bfd80  000bfd80  2**2
                  CONTENTS, ALLOC, LOAD, READONLY, DATA
  9 .ctors        00000004  000d1ad4  000d1ad4  000d0ad4  2**2
                  CONTENTS, ALLOC, LOAD, DATA
 10 .dynamic      000000e0  000d1ad8  000d1ad8  000d0ad8  2**2
                  CONTENTS, ALLOC, LOAD, DATA
 11 .got.plt      0000000c  000d1bb8  000d1bb8  000d0bb8  2**2
                  CONTENTS, ALLOC, LOAD, DATA
 12 .data         00003fac  000d1be0  000d1be0  000d0be0  2**5
                  CONTENTS, ALLOC, LOAD, DATA
 13 .writetext    0001bb80  000d5ba0  000d5ba0  000d4ba0  2**5
                  CONTENTS, ALLOC, LOAD, CODE
 14 .bss          0000f674  000f1720  000f1720  000f0720  2**5
                  ALLOC

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