Add crash utility extension

Change-Id: Ia3dadecdd4605c3ee74d1b5242f67486c675faa7

tools/crash/README

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+crash extension for mckernel
+
+== BUILD ==
+
+You can build it by installing the crash-devel package, or putting
+the files here in the extensions directory of the crash sources, and
+running `make -f mckernel.mk`
+
+== USAGE ==
+
+Either run 'extend path/to/mckernel.so' from within crash or run crash
+with `CRASH_EXTENSIONS=path/to/dir crash -x`
+You then need to tell crash about mckernel symbol with the `mcsymbols`
+command:
+
+  crash> mcsymbols path/to/mckernel.img
+  Loading symbols from path/to/mckernel.img... OK.
+
+If your mckernel.img is always at the same place, you can put the command
+in a crashrc file and load everything automatically with -i, such as:
+
+  CRASH_EXTENSIONS=.../crash/extensions crash -x -i .../crashrc
+
+
+At this point, you can use the various mckernel commands, as well as
+regular linux crash commands:
+
+  crash> help | xargs -n 1 | grep -E '^mc'
+  mcmem
+  mcps
+  mcsymbols
+  mcvtop
+  mckmsg
+
+Refer to the inline help of each command for their usage and examples.

tools/crash/mckernel.mk

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+#
+# Copyright (C) 2009, 2011, 2013 David Anderson
+# Copyright (C) 2009, 2011, 2013 Red Hat, Inc. All rights reserved.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+
+ifeq ($(shell arch), i686)
+  TARGET=X86
+  TARGET_CFLAGS=-D_FILE_OFFSET_BITS=64
+endif
+ifeq ($(shell arch), ppc64)
+  TARGET=PPC64
+  TARGET_CFLAGS=-m64
+endif
+ifeq ($(shell arch), ppc64le)
+  TARGET=PPC64
+  TARGET_CFLAGS=-m64
+endif
+ifeq ($(shell arch), ia64)
+  TARGET=IA64
+  TARGET_CFLAGS=
+endif
+ifeq ($(shell arch), x86_64)
+  TARGET=X86_64
+  TARGET_CFLAGS=
+endif
+
+ifeq ($(shell /bin/ls ../defs.h 2> /dev/null), ../defs.h)
+  INCDIR=..
+endif
+ifeq ($(shell /bin/ls ./defs.h 2> /dev/null), ./defs.h)
+  INCDIR=.
+endif
+ifeq ($(shell /bin/ls /usr/include/crash/defs.h 2>/dev/null), /usr/include/crash/defs.h)
+  INCDIR=/usr/include/crash
+endif
+
+all: mckernel.so
+
+mckernel.so: $(INCDIR)/defs.h mckernel.c
+	gcc -Wall -g -I$(INCDIR) -shared -rdynamic -o mckernel.so mckernel.c -fPIC -D$(TARGET) $(TARGET_CFLAGS) $(GDB_FLAGS)