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Joel Brobecker e068c55d5e x64-windows: Fix extraction of chained UNWIND_INFO
On x86_64-windows, GDB is unable to unwind past some code in
mswsock.dll. For instance:

    (gdb) bt
    #0  0x00000000778712fa in ntdll!ZwWaitForSingleObject ()
       from C:\Windows\SYSTEM32\ntdll.dll
    #1  0x000007fefcfb0f75 in WSPStartup ()
       from C:\Windows\system32\mswsock.dll
    Backtrace stopped: previous frame inner to this frame (corrupt stack?)

The UNWIND_INFO record for frame #1's PC has a UNW_FLAG_CHAININFO
flag, and so after having decoded this unwind record, GDB's decoder
next tries to locate the next unwind record on the chain. Unfortunately,
the location of that unwind info appears to be miscomputed. This is
the expression used:

         chain_vma = cache->image_base + unwind_info
           + sizeof (ex_ui) + ((codes_count + 1) & ~1) * 2 + 8;

The chain-info is expected to be right after the "Unwind codes
array" which is itself after all the fields of ex_ui's struct.
So the "+ 8" offset at the end should not be there.

Because of that extra offset, we were reading no longer processing
correct unwind info, leading the unwinder computing the wrong frame
size, computing the wrong return address, etc.

gdb/ChangeLog:

        * amd64-windows-tdep.c (amd64_windows_frame_decode_insns):
        Remove "+ 8" offset in computation of CHAIN_VMA.
2014-08-01 06:55:10 -07:00
bfd Fix PR10373 which is SH relax bug. 2014-08-01 19:17:47 +09:00
binutils [MIPS] Implement O32 FPXX, FP64 and FP64A ABI extensions 2014-07-29 11:27:59 +01:00
config
cpu
elfcpp [MIPS] Implement O32 FPXX, FP64 and FP64A ABI extensions 2014-07-29 11:27:59 +01:00
etc
gas Fix PR10378 which is SH relax bug. 2014-08-01 19:13:39 +09:00
gdb x64-windows: Fix extraction of chained UNWIND_INFO 2014-08-01 06:55:10 -07:00
gold
gprof
include [MIPS] Rename COPROC related macros 2014-07-29 13:58:54 +01:00
intl
ld Fix PR10373 which is SH relax bug. 2014-08-01 19:17:47 +09:00
libdecnumber
libiberty
opcodes [MIPS] Rename COPROC related macros 2014-07-29 13:58:54 +01:00
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ChangeLog or1k: GDB not supported for or1k*-*-rtems* 2014-07-27 18:43:52 +02:00
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config.sub Import config.sub from upstream config repo 2014-07-29 07:04:52 -04:00
configure or1k: GDB not supported for or1k*-*-rtems* 2014-07-27 18:43:52 +02:00
configure.ac or1k: GDB not supported for or1k*-*-rtems* 2014-07-27 18:43:52 +02:00
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		   README for GNU development tools

This directory contains various GNU compilers, assemblers, linkers, 
debuggers, etc., plus their support routines, definitions, and documentation.

If you are receiving this as part of a GDB release, see the file gdb/README.
If with a binutils release, see binutils/README;  if with a libg++ release,
see libg++/README, etc.  That'll give you info about this
package -- supported targets, how to use it, how to report bugs, etc.

It is now possible to automatically configure and build a variety of
tools with one command.  To build all of the tools contained herein,
run the ``configure'' script here, e.g.:

	./configure 
	make

To install them (by default in /usr/local/bin, /usr/local/lib, etc),
then do:
	make install

(If the configure script can't determine your type of computer, give it
the name as an argument, for instance ``./configure sun4''.  You can
use the script ``config.sub'' to test whether a name is recognized; if
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If you have more than one compiler on your system, it is often best to
explicitly set CC in the environment before running configure, and to
also set CC when running make.  For example (assuming sh/bash/ksh):

	CC=gcc ./configure
	make

A similar example using csh:

	setenv CC gcc
	./configure
	make

Much of the code and documentation enclosed is copyright by
the Free Software Foundation, Inc.  See the file COPYING or
COPYING.LIB in the various directories, for a description of the
GNU General Public License terms under which you can copy the files.

REPORTING BUGS: Again, see gdb/README, binutils/README, etc., for info
on where and how to report problems.