This is the mail archive of the
gcc-help@gcc.gnu.org
mailing list for the GCC project.
Re: Types table size and format in the .gcc_exception_table
- From: Ian Lance Taylor <iant at google dot com>
- To: Shahid Alam <alam_shahid at yahoo dot com>
- Cc: gcc-help at gcc dot gnu dot org, Shahid Alam <salam at cs dot uvic dot ca>
- Date: Mon, 7 Jan 2013 22:53:15 -0800
- Subject: Re: Types table size and format in the .gcc_exception_table
- References: <50EB3A80.7050000@yahoo.com>
On Mon, Jan 7, 2013 at 1:13 PM, Shahid Alam <alam_shahid@yahoo.com> wrote:
> As part of my research I am updating the .gcc_exception_table of a binary 64
> bit elf file. For small C++ programs that throw exceptions it works OK, but
> for large benchmark programs it's not working. My question is does GCC
> stores more than one table inside the .gcc_exception_table section of the
> elf file. If it does what's the exact format of these tables. I have some
> knowledge of the action table, action records and types table. I am not
> clear about the size of the types table.
>
> I am parsing the tables in this section but is not able to know the exact
> size and format of the types tables, where a pointer to the exception
> information is stored. I need to update this pointer to the new updated
> location.
I documented the .gcc_except_table section at
http://www.airs.com/blog/archives/464 .
Yes, there is normally more than one table (one LSDA) in the
.gcc_except_table section. There is normally one LSDA per function
that needs to handle exceptions. Each such function will have a
pointer to the LSDA in its FDE entry in the .eh_frame section, as
described at http://www.airs.com/blog/archives/460 .
Ian