This is a slight modification of the patch I posted last April.  It is
close to the minimal amount of code needed to verify that the Linux
kernel patch (still under development) is working, and will need more
work before it would be considered for committing.

The main change from the previous version is that
mips_linux_stopped_data_address() now always returns false as we
cannot accurately determine the location.

Why post it again you ask?  To have something to point people at.

Any comments or criticisms (about the patch) are welcome.  Note that I
am still aware of Daniel's earlier suggestions, and hope to act on
them soon.


2008-08-27  David Daney  <ddaney@avtrex.com>

	* config/mips/linux.mh (NAT_FILE): Change to nm-linux.h.
	* config/mips/nm-linux.h: New file.
	* infrun.c (handle_inferior_event): Use software single step when
	target requires it.
	* mips-linux-nat.c:  Include command.h and gdbcmd.h.
	(maint_show_dr): New variable.
	(PTRACE_GET_WATCH_REGS): New macro.
	(PTRACE_SET_WATCH_REGS): Same.
	(enum pt_watch_style): Define.
	(struct mips32_watch_regs): Define.
	(struct pt_watch_regs): Define.
	(MAX_DEBUG_REGISTER): New macro.
	(watch_mirror): New variable.
	(mips_show_dr, mips_linux_can_use_hardware_watchpoint,
	mips_linux_stopped_data_address, mips_linux_stopped_by_watchpoint,
	mips_linux_region_ok_for_watchpoint, watchlo_val,
	write_watchpoint_regs, mips_linux_insert_watchpoint,
	mips_linux_remove_watchpoint): New functions.
	(_initialize_mips_linux_nat): Register show-debug-regs maintenance
	command.