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Pedro Alves e6c2f47b45 Fix "set architecture mips:10000" crash
Fix this GDB crash:

  $ gdb -ex "set architecture mips:10000"
  Segmentation fault (core dumped)

Backtrace:

  Program received signal SIGSEGV, Segmentation fault.
  0x0000000000495b1b in mips_gdbarch_init (info=..., arches=0x0) at /home/pedro/gdb/mygit/cxx-convertion/src/gdb/mips-tdep.c:8436
  8436              if (bfd_get_flavour (info.abfd) == bfd_target_elf_flavour
  (top-gdb) bt
  #0  0x0000000000495b1b in mips_gdbarch_init (info=..., arches=0x0) at .../src/gdb/mips-tdep.c:8436
  #1  0x00000000007348a6 in gdbarch_find_by_info (info=...) at .../src/gdb/gdbarch.c:5155
  #2  0x000000000073563c in gdbarch_update_p (info=...) at .../src/gdb/arch-utils.c:522
  #3  0x0000000000735585 in set_architecture (ignore_args=0x0, from_tty=1, c=0x26bc870) at .../src/gdb/arch-utils.c:496
  #4  0x00000000005f29fd in do_sfunc (c=0x26bc870, args=0x0, from_tty=1) at .../src/gdb/cli/cli-decode.c:121
  #5  0x00000000005fd3f3 in do_set_command (arg=0x7fffffffdcdd "mips:10000", from_tty=1, c=0x26bc870) at .../src/gdb/cli/cli-setshow.c:455
  #6  0x0000000000836157 in execute_command (p=0x7fffffffdcdd "mips:10000", from_tty=1) at .../src/gdb/top.c:460
  #7  0x000000000071abfb in catch_command_errors (command=0x835f6b <execute_command>, arg=0x7fffffffdccc "set architecture mips:10000", from_tty=1)
      at .../src/gdb/main.c:368
  #8  0x000000000071bf4f in captured_main (data=0x7fffffffd750) at .../src/gdb/main.c:1132
  #9  0x0000000000716737 in catch_errors (func=0x71af44 <captured_main>, func_args=0x7fffffffd750, errstring=0x106b9a1 "", mask=RETURN_MASK_ALL)
      at .../src/gdb/exceptions.c:240
  #10 0x000000000071bfe6 in gdb_main (args=0x7fffffffd750) at .../src/gdb/main.c:1164
  #11 0x000000000040a6ad in main (argc=4, argv=0x7fffffffd858) at .../src/gdb/gdb.c:32
  (top-gdb)

We already check whether info.abfd is NULL before all other
bfd_get_flavour calls in the same function.  Just this one case was
missing.

(This was exposed by a WIP test that tries all "set architecture ARCH"
values.)

gdb/ChangeLog:
2016-03-07  Pedro Alves  <palves@redhat.com>

	* mips-tdep.c (mips_gdbarch_init): Check whether info.abfd is NULL
	before calling bfd_get_flavour.
2016-03-07 16:37:53 +00:00
bfd [AArch64] Create .got section if _GLOBAL_OFFSET_TABLE_ referenced 2016-03-07 15:40:50 +00:00
binutils [ARM] Build attributes for ARMv8.1-A AdvSIMD 2016-03-04 14:16:48 +00:00
config
cpu Correct fr30 comment 2016-03-03 12:55:30 +10:30
elfcpp
etc
gas Add const qualifiers at various places. 2016-03-07 15:16:28 +00:00
gdb Fix "set architecture mips:10000" crash 2016-03-07 16:37:53 +00:00
gold Fix datestamps on ChangeLog entries to read 2015 instead of 2016. 2016-03-04 14:19:12 -08:00
gprof
include Add const qualifiers at various places. 2016-03-07 15:16:28 +00:00
intl
ld [AArch64] Create .got section if _GLOBAL_OFFSET_TABLE_ referenced 2016-03-07 15:40:50 +00:00
libdecnumber
libiberty
opcodes Add const qualifiers at various places. 2016-03-07 15:16:28 +00:00
readline
sim Fix bugs in the simulation of the AArch64's ADDP, FADDP, LD1, CCMP and CCMP instructions. 2016-03-03 15:22:53 +00:00
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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
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.