Introduce common/errors.h

This introduces common/errors.h.  This holds some error- and warning-
related declarations that can be used by the code in common, nat and
target.  Some of the declared functions must be provided by the client
as documented by the header file comments.

gdb/
2014-08-07  Tom Tromey  <tromey@redhat.com>
	    Gary Benson  <gbenson@redhat.com>

	* common/errors.h: New file.
	* common/errors.c: Likewise.
	* Makefile.in (HFILES_NO_SRCDIR): Add common/errors.h.
	(COMMON_OBS): Add errors.o.
	(errors.o): New rule.
	* common/common-defs.h: Include errors.h.
	* utils.h (perror_with_name, error, verror, warning, vwarning):
	Don't declare.
	* common/common-utils.h: (malloc_failure, internal_error):
	Likewise.

gdb/gdbserver/
2014-08-07  Tom Tromey  <tromey@redhat.com>
	    Gary Benson  <gbenson@redhat.com>

	* Makefile.in (SFILES): Add common/errors.c.
	(OBS): Add errors.o.
	(IPA_OBS): Add errors-ipa.o.
	(errors.o): New rule.
	(errors-ipa.o): Likewise.
	* utils.h (perror_with_name, error, warning): Don't declare.
	* utils.c (warning): Renamed and rewritten as...
	(vwarning): New function.
	(error): Renamed and rewritten as...
	(verror): New function.
	(internal_error): Renamed and rewritten as...
	(internal_verror): New function.
Introduce common-types.h

This introduces common-types.h.  This file defines various standard
types used by gdb and gdbserver.

Currently these types are conditionally defined based on GDBSERVER.
The long term goal is to remove all such tests; however, this is
difficult as currently gdb uses definitions from BFD.  In the meantime
this is still a step in the right direction.

gdb/
2014-08-07  Tom Tromey  <tromey@redhat.com>
	    Gary Benson  <gbenson@redhat.com>

	* common/common-types.h: New file.
	* Makefile.in (HFILES_NO_SRCDIR): Add common/common-types.h.
	* common/common-defs.h: Include common-types.h.
	* defs.h (gdb_byte, CORE_ADDR, CORE_ADDR_MAX, LONGEST)
	(ULONGEST): Remove.

gdb/gdbserver/
2014-08-07  Tom Tromey  <tromey@redhat.com>
	    Gary Benson  <gbenson@redhat.com>

	* server.h: Add static assertion.
	(gdb_byte, CORE_ADDR, LONGEST, ULONGEST): Remove.
Move print-utils.h to common-defs.h

This commit moves the inclusion of print-utils.h to common-defs.h
and removes all other inclusions.

gdb/
2014-08-07  Gary Benson  <gbenson@redhat.com>

	* common/common-defs.h: Include print-utils.h.
	* utils.h: Do not include print-utils.h.

gdb/gdbserver/
2014-08-07  Gary Benson  <gbenson@redhat.com>

	* utils.h: Do not include print-utils.h.
Introduce and use debug_printf and debug_vprintf

This introduces debug_vprintf (a function that clients of the common
code are expected to implement) and debug_printf (a wrapper for
debug_vprintf).  A debug_vprintf function is written from scratch for
GDB; gdbserver's existing debug_printf is repurposed as debug_vprintf.

common/agent.c is changed to use debug_vprintf rather than
defining the macro DEBUG_AGENT depending on GDBSERVER.

nat/i386-dregs.c is changed to use the externally-implemented
debug_printf, rather than defining it itself.

gdb/
2014-08-07  Tom Tromey  <tromey@redhat.com>
	    Gary Benson  <gbenson@redhat.com>

	* common/common-debug.h: New file.
	* common/common-debug.c: Likewise.
	* debug.c: Likewise.
	* Makefile.in (HFILES_NO_SRCDIR): Add common/common-debug.h.
	(COMMON_OBS): Add common-debug.o and debug.o.
	(common-debug.o): New rule.
	* common/common-defs.h: Include common-debug.h.
	* common/agent.c (debug_agent_printf): New function.
	(DEBUG_AGENT): Redefine.
	* nat/i386-dregs.c (debug_printf): Undefine.

gdb/gdbserver/
2014-08-07  Tom Tromey  <tromey@redhat.com>
	    Gary Benson  <gbenson@redhat.com>

	* Makefile.in (SFILES): Add common/common-debug.c.
	(OBS): Add common-debug.o.
	(common-debug.o): New rule.
	* debug.h (debug_printf): Don't declare.
	* debug.c (debug_printf): Renamed and rewritten as...
	(debug_vprintf): New function.
Add target/target.h

This adds target/target.h.  This file declares some functions that
the shared code can use and that the clients must implement.  It
also changes some shared code to use these functions.
Add target/symbol.h

This adds target/symbol.h.  This file declares a function that the
shared code can use and that the clients must implement.  It also
changes some shared code to use these functions.
Introduce get_thread_regcache_for_ptid

This introduces get_thread_regcache_for_ptid so that we can simplify
nat/linux-btrace.c.  A better long term solution would be unify the
regcache code, but this is sufficient for now.
Include common-defs.h instead of defs.h/server.h in shared code

This commit makes 19 of the 22 shared .c files in common, nat and
target include common-defs.h instead of defs.h/server.h.  The
remaining three files need slight extra work and are dealt with
in separate commits.
Remove GDBSERVER uses from linux-btrace.c

This commit makes nat/linux-btrace.c include common-defs.h rather
than defs.h or server.h.  A couple of minor changes were required
to support this change.
Remove GDBSERVER uses from i386-dregs.c

This commit makes nat/i386-dregs.c include common-defs.h rather than
defs.h or server.h.  A couple of minor changes were required in order
to support this change.
Remove one GDBSERVER use from linux-waitpid.c

This commit makes nat/linux-waitpid.c include common-defs.h rather
than defs.h or server.h.  A use of GDBSERVER had to be left in to
support some some thread_db debug code.  This hack will be removed
when the Linux thread_db code is unified and made shared.