Re: [Elftoolchain-developers] "Augmentation: zRS" on signal frames

[Joseph K. <jko...@gm...>]

Thank you for the bug report.

I have filed ticket #557
<https://sourceforge.net/p/elftoolchain/tickets/557/>.

Regards,
Joseph Koshy

On Tue, Mar 6, 2018 at 2:17 AM, David Young <dyo...@po...>
wrote:

> I've found that in elftoolchain 0.7.1, the libdwarf function
> dwarf_get_fde_list_eh() exits with an error when an object has a CIE
> with 'S'-augmentation in its .eh_frame section:
>
> Augmentation: zRS
>
> The augmentation has something to do with signal frames.
>
> I've worked around this by slightly patching libdwarf_frame.c:
>
> --- a/external/bsd/elftoolchain/libdwarf/libdwarf_frame.c
> +++ b/external/bsd/elftoolchain/libdwarf/libdwarf_frame.c
> @@ -143,6 +143,7 @@ _dwarf_frame_parse_lsb_cie_augment(Dwarf_Debug dbg,
> Dwarf_Cie cie,
>         while (*aug_p != '\0') {
>                 switch (*aug_p) {
>                 case 'L':
> +               case 'S':
>                         /* Skip one augment in augment data. */
>                         augdata_p++;
>                         break;
>
>
> Without the patch, an 'S'-augmentation makes
> _dwarf_frame_parse_lsb_cie_augment() exit with an error at the switch's
> default case.
>
> Dave
>
> --
> David Young
> dy...@po...    Urbana, IL    (217) 721-9981
>
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