I am not done yet; there are still problems.  However, I would like to post
some interim patches.  These work on netbsd/m68k for hp300 machines; they
may not work on other ports (sun3).  These patches incorporate other hints
that were posted to this list in the past two days.

The big problem was cache flushing - the code was there, but disabled and
with slightly malformed syntax.

Also a suggestion: config/m68k/jit.h looks like it's actually used, but it
isn't.  Rather, config/m68k/netbsd1/jit.h is used instead.  I don't know if
this is true across the board for all m68k ports, but if m68k/jit.h is meant
to be a template, then it should be marked and named as such.


*** threads.h.old	Sun Feb 21 08:21:14 1999
--- threads.h	Sun Feb 21 08:21:20 1999
***************
*** 20,26 ****
  /*
   * Set a default size for the stack.
   */
! #define	THREADSTACKSIZE		(32 * 1024)
  
  /*
   * Stack offset.
--- 20,26 ----
  /*
   * Set a default size for the stack.
   */
! #define	THREADSTACKSIZE		(64 * 1024)
  
  /*
   * Stack offset.
*** trampolines.c.old	Sat Feb 20 09:22:17 1999
--- trampolines.c	Sat Feb 20 09:22:34 1999
***************
*** 33,39 ****
  #define C_FUNC_NAME(FUNC) #FUNC
  #endif
  
! #if defined(NO_SHARED_VMLIBRARY)
  
  asm(
          START_ASM_FUNC() C_FUNC_NAME(m68k_do_fixup_trampoline) "\n"
--- 33,39 ----
  #define C_FUNC_NAME(FUNC) #FUNC
  #endif
  
! #if 1 /*defined(NO_SHARED_VMLIBRARY)*/
  
  asm(
          START_ASM_FUNC() C_FUNC_NAME(m68k_do_fixup_trampoline) "\n"
*** netbsd1/jit.h.old	Sun Feb 21 08:22:22 1999
--- netbsd1/jit.h	Sun Feb 21 20:58:35 1999
***************
*** 52,59 ****
     necessary). */
  #define CALL_KAFFE_EXCEPTION(frame, info, obj)				\
  	__asm__ __volatile__(						\
- 		"move%.l %0,%/a6\n\t"					\
  		"move%.l %1,%/d0\n\t"					\
  		"jmp %2@"						\
  		: : "g"(frame->retbp), "g"(obj), "a"(info.handler)	\
  		: "d0", "cc", "memory")
--- 52,59 ----
     necessary). */
  #define CALL_KAFFE_EXCEPTION(frame, info, obj)				\
  	__asm__ __volatile__(						\
  		"move%.l %1,%/d0\n\t"					\
+ 		"move%.l %0,%/a6\n\t"					\
  		"jmp %2@"						\
  		: : "g"(frame->retbp), "g"(obj), "a"(info.handler)	\
  		: "d0", "cc", "memory")
***************
*** 184,202 ****
     privledged instruction, so we have to get operating system help
     for this.  Naturally, there is no standard there.  */
  
- #define FLUSH_DCACHE(beg, end) __clear_cache((beg), (end))
- #if 0
  #define FLUSH_DCACHE(beg, end)                                  \
          __asm__ __volatile__(                                   \
!                 "movem%.l %/d0-%/d7/%/a0-%/a5,%-\n\t"           \
                  "move%.l %0,%/a1\n\t"                           \
                  "move%.l %1,%/d1\n\t"                           \
                  "sub%.l %/d1,%/a1\n\t"                          \
                  "movel  %#0x80000004,d0\n\t"                    \
                  "trap   %#12\n\t"                               \
!                 "movem%.l %+,%/d0-%/d7/%/a0-%/a5"               \
                  :                                               \
                  : "g" (beg), "g" (end) )
- #endif
  
  #endif
--- 184,199 ----
     privledged instruction, so we have to get operating system help
     for this.  Naturally, there is no standard there.  */
  
  #define FLUSH_DCACHE(beg, end)                                  \
          __asm__ __volatile__(                                   \
!                 "movem%.l %/d0-%/d7/%/a0-%/a5,%/sp@-\n\t"       \
                  "move%.l %0,%/a1\n\t"                           \
                  "move%.l %1,%/d1\n\t"                           \
                  "sub%.l %/d1,%/a1\n\t"                          \
                  "movel  %#0x80000004,d0\n\t"                    \
                  "trap   %#12\n\t"                               \
!                 "movem%.l %/sp@+,%/d0-%/d7/%/a0-%/a5"           \
                  :                                               \
                  : "g" (beg), "g" (end) )
  
  #endif