2011-07-22 Pedro Alves <pedro@codesourcery.com>

	gdb/testsuite/
	* gdb.arch/i386-dr3-watch.exp: Test that the i386 watchpoints
	backend doesn't leave used debug registers behind.

	gdb/gdbserver/
	* i386-low.c (i386_insert_aligned_watchpoint): Don't pass the info
	to the inferior here.
	(i386_remove_aligned_watchpoint): Ditto.
	(i386_handle_nonaligned_watchpoint): Return immediate on fail to
	fit part of the watchpoint in the debug registers.
	(i386_update_inferior_debug_regs): New.
	(i386_low_insert_watchpoint): Work on a local mirror of the debug
	registers, and only update the inferior on success.
	(i386_low_remove_watchpoint): Ditto.

	gdb/
	* i386-nat.c (I386_DR_VACANT, I386_DR_LOCAL_ENABLE)
	(I386_DR_GLOBAL_ENABLE, I386_DR_DISABLE, I386_DR_SET_RW_LEN)
	(I386_DR_GET_RW_LEN, I386_DR_WATCH_HIT): Add state parameter and
	adjust.
	(dr_mirror, dr_status_mirror, dr_control_mirror): Delete.
	(struct i386_debug_reg_state): New.
	(i386_init_dregs): New.
	(dr_mirror): New.
	(i386_cleanup_dregs): Use i386_init_dregs.
	(i386_show_dr): Add state parameter and adjust.
	(i386_insert_aligned_watchpoint): Ditto.  Don't pass the info to
	the inferior here.
	(i386_remove_aligned_watchpoint): Likewise.
	(i386_handle_nonaligned_watchpoint): Add state parameter and adjust.
	(i386_update_inferior_debug_regs): New.
	(i386_insert_watchpoint): Work on a local mirror of the debug
	registers, and only update the inferior on success.
	(i386_remove_watchpoint): Ditto.
	(i386_region_ok_for_watchpoint): Adjust.
	(i386_stopped_data_address): Adjust.
	(i386_insert_hw_breakpoint): Adjust.
	(i386_remove_hw_breakpoint): Adjust.

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