ip2k port

[Andrew Cagney]

This isn't needed.  All targets a bi-endian.  Even the i386:

> /* Define the bit, byte, and word ordering of the machine. */
> #define TARGET_BYTE_ORDER       BFD_ENDIAN_BIG

Ok, looks like this will need multi-arching. Can you file a bug report 
to track this?

> /* Functions for dealing with epilogue call and return stubs. */
> #define IGNORE_HELPER_CALL(pc) ip2k_ignore_helper (pc)
> extern int ip2k_ignore_helper (CORE_ADDR pc);

This thread stuff could do with some comments, I'm also wondering if 
these constants belong in a header somewhere:

/* Threads.  */
#define IP2K_ISR_THREAD 1
#define IP2K_MAIN_THREAD 2
#define IP2K_VM_THREAD 3

Where sensible, use enums, rather than #define's:

#define DEBUG_NONE 0
#define DEBUG_NORMAL 1
#define DEBUG_EXTRA 2
#define DEBUG_MAX 3

Use NOINDENT (Ref: defs.h), otherwize, gdb_indent.sh will muck up these 
tables:

/* Prologue instructions - return address.
         push CALLL      (0x447f)
         push CALLH      (0x447e) */

Debug output is printed with "fprintf_unfiltered (gdb_stdlog, ...):
  if (debug_level >= DEBUG_MAX)
     printf_filtered ("ip2k_address_to_pointer\n");

Print CORE_ADDRS using "0x%s", paddr[_nz]():

       warning ("invalid instruction pointer: 0x%08lx", addr);

Don't print internal errors using warning, call internal_error, or even 
just use ARRAY_SIZE in an assert:

       warning ("internal error: ip2k_register_name: invalid register: 
0x%08x", r

Use warning(), not printf_filtered for warnings:

   printf_filtered ("warning: unable to find start of function of pc: 
0x%08lx\n",
  pc);

Call error() for errors:

       printf_unfiltered ("Error: Return values longer than 8 bytes are 
not suppo
rted.\n");

If you re-factor the function (spliting it into two), the "goto" can be 
replaced by a "return:

	finish:

I've fixed frame.c, so this is no longer needed:

   /* Check that we're not going round in circles with the same frame
      ID (but avoid applying the test to sentinel frames which do go
      round in circles).  Can't use frame_id_eq() as that doesn't yet
      compare the frame's PC value.  */

In the frame code, frame*memory, instead of target_read_memory, should 
be used:

       if (target_read_memory (info->current_sp + 1, buf, 1) != 0)

	finish:

It all looks byte order clean (which is the most common problem) and not 
to scary.  The above are all minor tweaks.

BTW, do you have a list of people that contributed to the file?

Andrew