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From: andy@juno.caltech.edu (Andy Fyfe)
Newsgroups: unix-pc.general,comp.sys.att
Subject: Re: UNIX3.51m Kernel object files, it matches FIXDISK2.0 binary... (*LONG*)
Keywords: Kernel, object files, relocatable, UNIX3.51m
Message-ID: <1990Apr11.042020.5317@laguna.ccsf.caltech.edu>
Date: 11 Apr 90 04:20:20 GMT
References: <1135@icus.ICUS.COM>
Sender: news@laguna.ccsf.caltech.edu
Reply-To: andy@csvax.caltech.edu
Organization: California Institute of Technology
Lines: 108

A while back someone made the observation that one can easily buy a
board that houses a 68020 and plugs into a 68010 (or was it 68000)
socket.  The problem, of course, was the software.  Now that the kernel
is available in its consistuent pieces, is it now possible to correct
the software problem?

The Gnu C compiler is capable of generating 68020 code, and, it seems,
the assembler and linker are more than happy to deal with it.  Included
below are diffs to tm-3b1.h that correct a few minor 68020 boo-boos.  (If
someone would like to check them, I'll delay forwarding them to bug-gcc.)
I've been able to make a 68020 version of gcc, though, of course, I can't
run it!

Maybe this would even permit a 68881 to be added.  (This is where a
problem comes up with the loader.  A file that uses floating point is
flagged by the assembler as either "soft" or "68881".  Unfortunately,
the loader doesn't appear to allow these two types of objects to be
mixed together.)

Here are a few lines you can add to /etc/magic to get the cpu and fpu
type of a file (this in the m68k executable section):
    >18	short		&0x1800 0x0000	[68010]
    >18	short		&0x1800 0x0800	[68020]
    >18	short		&0xe000 0x0000	[float-none]
    >18	short		&0xe000 0x2000	[float-soft]
    >18	short		&0xe000 0x4000	[68881]
    >18	short		&0xe000 0x8000	[sky]

Any thoughts from the experts?

Andy Fyfe					andy@csvax.caltech.edu

*** tm-3b1.h-save	Tue Apr 10 02:00:06 1990
--- tm-3b1.h	Tue Apr 10 13:33:17 1990
***************
*** 35,39 ****
  
  #undef ASM_SPEC
! #define ASM_SPEC "%{m68020:-68020}%{!m68020:-68010}"
  
  /* we use /lib/libp/lib*  when profiling */
--- 35,39 ----
  
  #undef ASM_SPEC
! #define ASM_SPEC "%{m68020:-68020}%{!m68020:-68010} %{m68881:-68881}"
  
  /* we use /lib/libp/lib*  when profiling */
***************
*** 97,100 ****
--- 97,101 ----
  
  #undef TARGET_VERSION
+ #undef REGISTER_NAMES
  #undef ASM_FORMAT_PRIVATE_NAME
  #undef ASM_OUTPUT_DOUBLE
***************
*** 116,119 ****
--- 117,125 ----
  #define TARGET_VERSION fprintf (stderr, " (68k, SGS/AT&T unixpc syntax)");
  
+ #define REGISTER_NAMES \
+ {"%d0", "%d1", "%d2", "%d3", "%d4", "%d5", "%d6", "%d7",	\
+  "%a0", "%a1", "%a2", "%a3", "%a4", "%a5", "%fp", "%sp",	\
+  "%f0", "%f1", "%f2", "%f3", "%f4", "%f5", "%f6", "%f7"}
+ 
  /* Store in OUTPUT a string (made with alloca) containing
     an assembler-name for a local static variable named NAME.
***************
*** 299,303 ****
  		     CODE_LABEL_NUMBER (XEXP (addr, 0)),		\
  		     reg_names[REGNO (ireg)]);				\
! 	  if (scale != 1) fprintf (FILE, ":%d", scale);			\
  	  fprintf (FILE, ")");						\
  	  break; }							\
--- 305,309 ----
  		     CODE_LABEL_NUMBER (XEXP (addr, 0)),		\
  		     reg_names[REGNO (ireg)]);				\
! 	  if (scale != 1) fprintf (FILE, "*%d", scale);			\
  	  fprintf (FILE, ")");						\
  	  break; }							\
***************
*** 324,328 ****
  	  else if (ireg != 0)						\
  	    fprintf (FILE, "%s.l", reg_names[REGNO (ireg)]);		\
! 	  if (scale != 1) fprintf (FILE, ":%d", scale);			\
  	  putc (')', FILE);						\
  	  break;							\
--- 330,334 ----
  	  else if (ireg != 0)						\
  	    fprintf (FILE, "%s.l", reg_names[REGNO (ireg)]);		\
! 	  if (scale != 1) fprintf (FILE, "*%d", scale);			\
  	  putc (')', FILE);						\
  	  break;							\
***************
*** 384,389 ****
        if (!strncmp ((PTR), "fmove", 5))			\
  	{ fprintf ((FILE), "fmov"); (PTR) += 5; }	\
!       else if (!strncmp ((PTR), "ftst", 4))		\
! 	{ fprintf ((FILE), "ftest"); (PTR) += 4; }	\
      }							\
  /* MOVE, MOVEA, MOVEQ, MOVEC ==> MOV	*/		\
--- 390,395 ----
        if (!strncmp ((PTR), "fmove", 5))			\
  	{ fprintf ((FILE), "fmov"); (PTR) += 5; }	\
!       else if (!strncmp ((PTR), "fbne", 4))			\
! 	{ fprintf ((FILE), "fbneq"); (PTR) += 4; }	\
      }							\
  /* MOVE, MOVEA, MOVEQ, MOVEC ==> MOV	*/		\