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Pedro Alves c38e85596e AIX 32-bit core loading, high section addresses.
I noticed GDB was failing to enable threading support for 32-bit AIX
cores.  I traced it to failure to read variables from libpthreads.a.
The issue is that data for that library is loaded at a high address,
and bfd is sign extending the section addresses:

 (gdb) info files
 Symbols from "/home/palves/crash".
 Local core dump file:
	 `/home/palves/core', file type aixcoff-rs6000.
	 0x2ff22000 - 0x2ff23000 is .stack
	 0x20000000 - 0x200316e0 is .data
	 0x20000e90 - 0x200016c0 is .data
	 0xfffffffff0254000 - 0xfffffffff0297920 is .data
	 0xfffffffff07b46a8 - 0xfffffffff07b47c8 is .data
	 0xfffffffff0298000 - 0xfffffffff029bfcc is .data
	 0xfffffffff06dafe0 - 0xfffffffff07b3838 is .data
 Local exec file:
	 `/home/palves/crash', file type aixcoff-rs6000.
	 Entry point: 0x20001394
	 0x10000150 - 0x10000e90 is .text
	 0x20000e90 - 0x2000149c is .data
	 0x2000149c - 0x200016c0 is .bss
	 0xd053b124 - 0xd053e15f is .text in /usr/lib/libpthreads.a(shr_comm.o)
	 0xf0254000 - 0xf0297920 is .data in /usr/lib/libpthreads.a(shr_comm.o)
	 0xf0254450 - 0xf0297920 is .bss in /usr/lib/libpthreads.a(shr_comm.o)
	 0xd053a280 - 0xd053aabe is .text in /usr/lib/libcrypt.a(shr.o)
	 0xf07b46a8 - 0xf07b47c8 is .data in /usr/lib/libcrypt.a(shr.o)
	 0xf07b47c8 - 0xf07b47c8 is .bss in /usr/lib/libcrypt.a(shr.o)
	 0xd04fb180 - 0xd053917e is .text in /usr/lib/libpthreads.a(shr_xpg5.o)
	 0xf0298000 - 0xf029bfcc is .data in /usr/lib/libpthreads.a(shr_xpg5.o)
	 0xf029bf64 - 0xf029bfcc is .bss in /usr/lib/libpthreads.a(shr_xpg5.o)
	 0xd0100900 - 0xd04fa39c is .text in /usr/lib/libc.a(shr.o)
	 0xf06dafe0 - 0xf07b3838 is .data in /usr/lib/libc.a(shr.o)
	 0xf0751e94 - 0xf07b3838 is .bss in /usr/lib/libc.a(shr.o)

Notice:
	...
	0xfffffffff0298000 - 0xfffffffff029bfcc is .data
	...

Those are the bfd section start/end addresses.  It't not visible here:

         ...
	 0xf0298000 - 0xf029bfcc is .data in /usr/lib/libpthreads.a(shr_xpg5.o)
         ...

... just because GDB trims that number to 32-bit when printing.

GDB then fails to find the memory for libpthreads.a variables in the
core, and falls back to reading it directly from the executable (which
yields the values as originally initialized in the code).

E.g.:

 (gdb) p &__n_pthreads
 $2 = (<data variable, no debug info> *) 0xf074fda8 <__n_pthreads>
 (gdb) p __n_pthreads
 $1 = -1

That should have returned 2 instead of -1.

bfd/
2014-03-07  Pedro Alves  <palves@redhat.com>

	* rs6000-core.c (rs6000coff_core_p): Cast pointers to bfd_vma
	through ptr_to_uint instead of through long.
2014-03-07 12:11:40 +00:00
bfd AIX 32-bit core loading, high section addresses. 2014-03-07 12:11:40 +00:00
binutils Patch for PR binutils/16664 which triggers a seg-fault when attempting to 2014-03-06 10:57:13 +00:00
config strip off +x bits on non-executable/script files 2013-12-07 02:03:03 -05:00
cpu strip off +x bits on non-executable/script files 2013-12-07 02:03:03 -05:00
elfcpp Update copyright years 2014-03-05 22:16:15 +10:30
etc PR other/46202: implement install-strip. 2010-11-20 19:37:58 +00:00
gas * gas/tc-avr.c: Add new devices 2014-03-06 18:59:05 +04:00
gdb btrace, test: fix gdb.btrace/data test 2014-03-07 10:05:42 +01:00
gold Update copyright years 2014-03-05 22:16:15 +10:30
gprof Update copyright years 2014-03-05 22:16:15 +10:30
include Update copyright years 2014-03-05 22:16:15 +10:30
intl merge from gcc 2010-09-27 21:01:18 +00:00
ld Apply ld-arm/gc-hidden-1 to all ELF targets, not just *eabi* targets 2014-03-06 09:46:15 -08:00
libdecnumber merge from gcc 2013-10-16 00:29:48 +00:00
libiberty [PATCH] include * ansidecl.h (ANSI_PROTOTYPES, PTRCONST, LONG_DOUBLE, PARAMS) (VPARAMS, VA_START, VA_OPEN, VA_CLOSE, VA_FIXEDARG, CONST) (VOLATILE, SIGNED, PROTO, EXFUN, DEFUN, DEFUN_VOID, AND, DOTS) (NOARGS): Don't define. * libiberty.h (expandargv, writeargv): Don't use PARAMS. libiberty * _doprint.c (checkit): Use stdarg, not VA_* macros. * asprintf.c (asprintf): Use stdarg, not VA_* macros. * concat.c (concat_length, concat_copy, concat_copy2, concat) (reconcat): Use stdarg, not VA_* macros. * snprintf.c (snprintf): Use stdarg, not VA_* macros. * vasprintf.c (checkit): Use stdarg, not VA_* macros. * vsnprintf.c (checkit): Use stdarg, not VA_* macros. 2014-01-21 08:52:09 -07:00
opcodes Update copyright years 2014-03-05 22:16:15 +10:30
readline * readline.c (bind_arrow_keys_internal): 2013-09-24 14:49:48 +00:00
sim sim: constify prog_name 2014-03-05 01:42:44 -05:00
texinfo
.cvsignore
.gitignore Sync the root .gitignore file with GCC's. 2013-01-11 15:17:35 +00:00
ChangeLog PR target/59788 2014-02-06 11:01:57 +01:00
compile
config-ml.in * config-ml.in: Don't handle arc-*-elf*. 2011-03-22 20:01:13 +00:00
config.guess Import config.sub and config.guess from upstream. 2013-11-23 09:02:29 +10:30
config.rpath Remove freebsd1 from libtool.m4 macros and config.rpath. 2011-02-13 21:00:14 +00:00
config.sub Import config.sub and config.guess from upstream. 2013-11-23 09:02:29 +10:30
configure * configure.ac: Add user-friendly check for native x86_64-linux multilibs. * configure: Regenerate. 2013-12-16 13:42:54 -07:00
configure.ac * configure.ac: Add user-friendly check for native x86_64-linux multilibs. * configure: Regenerate. 2013-12-16 13:42:54 -07:00
COPYING
COPYING.LIB
COPYING.LIBGLOSS 2013-01-07 Jeff Johnston <jjohnstn@redhat.com> 2013-01-07 21:39:26 +00:00
COPYING.NEWLIB 2013-10-01 Jeff Johnston <jjohnstn@redhat.com> 2013-10-01 18:14:04 +00:00
COPYING3
COPYING3.LIB
depcomp
djunpack.bat
install-sh
libtool.m4 * libtool.m4 (_LT_ENABLE_LOCK <ld -m flags>): Remove non-canonical 2013-09-20 09:51:25 +00:00
ltgcc.m4
ltmain.sh PR target/59788 2014-02-06 11:01:57 +01:00
ltoptions.m4 Sync Libtool from GCC. 2010-01-09 21:11:44 +00:00
ltsugar.m4
ltversion.m4 Sync Libtool from GCC. 2010-01-09 21:11:44 +00:00
lt~obsolete.m4 Sync Libtool from GCC. 2010-01-09 21:11:44 +00:00
MAINTAINERS MAINTAINERS: clarify policy with config/ (and other top level files) 2012-05-12 03:10:17 +00:00
Makefile.def Added Cilk runtime library (libcilkrts) into GCC. 2013-11-08 11:11:41 -07:00
Makefile.in * Makefile.in: Regenerate. 2013-11-08 11:11:42 -07:00
Makefile.tpl * Makefile.tpl: Fix typo. * Makefile.in: Regenerate. 2013-11-08 11:11:42 -07:00
makefile.vms
missing
mkdep
mkinstalldirs
move-if-change Import move-if-change script from gnulib. 2011-02-12 15:47:02 +00:00
README
README-maintainer-mode
setup.com 2009-09-01 Tristan Gingold <gingold@adacore.com> 2009-09-01 13:38:26 +00:00
src-release * src-release (do-proto-toplevel): Support subdir-path-prefixed 2013-10-15 20:45:52 +00:00
symlink-tree
ylwrap

		   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
it is, config.sub translates it to a triplet specifying CPU, vendor,
and OS.)

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.