Add --pcrel option to m68k port

gas/ChangeLog

@@ -1,3 +1,12 @@
+2000-07-31  Michael Sokolov  <msokolov@ivan.Harhan.ORG>
+
+        * config/tc-m68k.c (flag_keep_pcrel, OPTION_PCREL): Add --pcrel option.
+        (md_convert_frag_1, md_estimate_size_before_relax): When making DBcc
+        long emit a long branch if available instead of an absolute jump, never
+        emit absolute jumps for anything with --pcrel.
+
+	* doc/c-m68k.texi: Document new command line option.
+	
 2000-07-28  Jason Eckhardt  <jle@cygnus.com>
 
         * configure.in: Add bits for i860-stardent-{sysv4, elf}*.

gas/Makefile.in

@@ -1889,7 +1889,7 @@ configure configure.in gdbinit.in itbl-lex.c itbl-parse.c
 
 DISTFILES = $(DIST_COMMON) $(SOURCES) $(HEADERS) $(TEXINFOS) $(EXTRA_DIST)
 
-TAR = tar
+TAR = gtar
 GZIP_ENV = --best
 SOURCES = $(itbl_test_SOURCES) $(as_new_SOURCES) $(EXTRA_as_new_SOURCES) $(gasp_new_SOURCES)
 OBJECTS = $(itbl_test_OBJECTS) $(as_new_OBJECTS) $(gasp_new_OBJECTS)

gas/aclocal.m4

@@ -173,7 +173,7 @@ LD="$LD" LDFLAGS="$LDFLAGS" LIBS="$LIBS" \
 LN_S="$LN_S" NM="$NM" RANLIB="$RANLIB" \
 DLLTOOL="$DLLTOOL" AS="$AS" OBJDUMP="$OBJDUMP" \
 ${CONFIG_SHELL-/bin/sh} $ac_aux_dir/ltconfig --no-reexec \
-$libtool_flags --no-verify $ac_aux_dir/ltmain.sh $lt_target \
+$libtool_flags --no-verify $ac_aux_dir/ltmain.sh $host \
 || AC_MSG_ERROR([libtool configure failed])
 
 # Reload cache, that may have been modified by ltconfig
@@ -205,11 +205,6 @@ AC_REQUIRE([AC_PROG_NM])dnl
 AC_REQUIRE([AC_PROG_LN_S])dnl
 dnl
 
-case "$target" in
-NONE) lt_target="$host" ;;
-*) lt_target="$target" ;;
-esac
-
 # Check for any special flags to pass to ltconfig.
 libtool_flags="--cache-file=$cache_file"
 test "$enable_shared" = no && libtool_flags="$libtool_flags --disable-shared"
@@ -228,7 +223,7 @@ test x"$silent" = xyes && libtool_flags="$libtool_flags --silent"
 
 # Some flags need to be propagated to the compiler or linker for good
 # libtool support.
-case "$lt_target" in
+case "$host" in
 *-*-irix6*)
   # Find out which ABI we are using.
   echo '[#]line __oline__ "configure"' > conftest.$ac_ext
@@ -495,7 +490,7 @@ AC_MSG_RESULT([$NM])
 AC_DEFUN(AC_CHECK_LIBM,
 [AC_REQUIRE([AC_CANONICAL_HOST])dnl
 LIBM=
-case "$lt_target" in
+case "$host" in
 *-*-beos* | *-*-cygwin*)
   # These system don't have libm
   ;;

gas/cgen.c

@@ -1,5 +1,5 @@
 /* GAS interface for targets using CGEN: Cpu tools GENerator.
-   Copyright (C) 1996, 1997, 1998, 1999 Free Software Foundation, Inc.
+   Copyright (C) 1996, 1997, 1998, 1999, 2000 Free Software Foundation, Inc.
 
 This file is part of GAS, the GNU Assembler.
 

gas/cgen.h

@@ -1,5 +1,5 @@
 /* GAS cgen support.
-   Copyright (C) 1998, 1999 Free Software Foundation, Inc.
+   Copyright (C) 1998, 1999, 2000 Free Software Foundation, Inc.
 
    This file is part of GAS, the GNU Assembler.
 

gas/config/tc-m68k.c

@@ -74,6 +74,7 @@ int flag_want_pic;
 
 static int flag_short_refs;	/* -l option */
 static int flag_long_jumps;	/* -S option */
+static int flag_keep_pcrel;	/* --pcrel option.  */
 
 #ifdef REGISTER_PREFIX_OPTIONAL
 int flag_reg_prefix_optional = REGISTER_PREFIX_OPTIONAL;
@@ -4317,8 +4318,11 @@ md_convert_frag_1 (fragP)
       ext = 2;
       break;
     case TAB (ABRANCH, LONG):
-      if (!HAVE_LONG_BRANCH(current_architecture))
+      if (!HAVE_LONG_BRANCH (current_architecture))
 	{
+	  if (flag_keep_pcrel)
+	    as_bad (_("long branch not supported"));
+	  
 	  if (fragP->fr_opcode[0] == 0x61)
 	    /* BSR */
 	    {
@@ -4363,6 +4367,9 @@ md_convert_frag_1 (fragP)
     case TAB (BCC68000, LONG):
       /* only Bcc 68000 instructions can come here */
       /* change bcc into b!cc/jmp absl long */
+      if (flag_keep_pcrel)
+	as_bad (_("long branch not supported"));
+      
       fragP->fr_opcode[0] ^= 0x01;	/* invert bcc */
       fragP->fr_opcode[1] = 0x6;/* branch offset = 6 */
 
@@ -4379,18 +4386,30 @@ md_convert_frag_1 (fragP)
       break;
     case TAB (DBCC, LONG):
       /* only DBcc 68000 instructions can come here */
-      /* change dbcc into dbcc/jmp absl long */
+      /* Change dbcc into dbcc/bral.  */
+      if (! HAVE_LONG_BRANCH (current_architecture) && flag_keep_pcrel)
+	as_bad (_("long branch not supported"));
+
       /* JF: these used to be fr_opcode[2-7], but that's wrong */
       *buffer_address++ = 0x00;	/* branch offset = 4 */
       *buffer_address++ = 0x04;
       *buffer_address++ = 0x60;	/* put in bra pc+6 */
       *buffer_address++ = 0x06;
-      *buffer_address++ = 0x4e;	/* put in jmp long (0x4ef9) */
+      if (HAVE_LONG_BRANCH (current_architecture))
+	{
+	  *buffer_address++ = 0x60;     /* Put in bral (0x60ff).  */
+	  *buffer_address++ = (char) 0xff;
+	}
+      else
+	{
+	  *buffer_address++ = 0x4e;     /* Put in jmp long (0x4ef9).  */
 	  *buffer_address++ = (char) 0xf9;
+	}
 
       fragP->fr_fix += 6;	/* account for bra/jmp instructions */
       fix_new (fragP, fragP->fr_fix, 4, fragP->fr_symbol,
-	       fragP->fr_offset, 0, NO_RELOC);
+	       fragP->fr_offset, HAVE_LONG_BRANCH (current_architecture),
+	       NO_RELOC);
       fragP->fr_fix += 4;
       ext = 0;
       break;
@@ -4532,7 +4551,8 @@ md_estimate_size_before_relax (fragP, segment)
 	    fragP->fr_subtype = TAB (TABTYPE (fragP->fr_subtype), BYTE);
 	    break;
 	  }
-	else if ((fragP->fr_symbol != NULL) && flag_short_refs)
+	else if ((fragP->fr_symbol != NULL)
+		 && (flag_short_refs || flag_keep_pcrel))
 	  {			/* Symbol is undefined and we want short ref */
 	    fix_new (fragP, (int) (fragP->fr_fix), 2, fragP->fr_symbol,
 		     fragP->fr_offset, 1, NO_RELOC);
@@ -4630,7 +4650,7 @@ md_estimate_size_before_relax (fragP, segment)
 	    break;
 	  }
 	/* only Bcc 68000 instructions can come here */
-	if ((fragP->fr_symbol != NULL) && flag_short_refs)
+	if ((fragP->fr_symbol != NULL) && (flag_short_refs || flag_keep_pcrel))
 	  {
 	    /* the user wants short refs, so emit one */
 	    fix_new (fragP, fragP->fr_fix, 2, fragP->fr_symbol,
@@ -4666,7 +4686,10 @@ md_estimate_size_before_relax (fragP, segment)
 	  }
 	/* only DBcc 68000 instructions can come here */
 
-	if (fragP->fr_symbol != NULL && flag_short_refs)
+	if (fragP->fr_symbol != NULL
+	    && (flag_short_refs
+		|| (! HAVE_LONG_BRANCH (current_architecture)
+		    && flag_keep_pcrel)))
 	  {
 	    /* the user wants short refs, so emit one */
 	    fix_new (fragP, fragP->fr_fix, 2, fragP->fr_symbol,
@@ -4675,18 +4698,27 @@ md_estimate_size_before_relax (fragP, segment)
 	  }
 	else
 	  {
-	    /* change dbcc into dbcc/jmp absl long */
+	    /* Change dbcc into dbcc/bral.  */
 	    /* JF: these used to be fr_opcode[2-4], which is wrong. */
 	    buffer_address[0] = 0x00;	/* branch offset = 4 */
 	    buffer_address[1] = 0x04;
 	    buffer_address[2] = 0x60;	/* put in bra pc + ... */
 	    /* JF: these were fr_opcode[5-7] */
 	    buffer_address[3] = 0x06;	/* Plus 6 */
-	    buffer_address[4] = 0x4e;	/* put in jmp long (0x4ef9) */
+	    if (HAVE_LONG_BRANCH (current_architecture))
+	      {
+		buffer_address[4] = 0x60;       /* Put in bral (0x60ff).  */
+		buffer_address[5] = (char) 0xff;
+	      }
+	    else
+	      {
+		buffer_address[4] = 0x4e;       /* Put in jmp long (0x4ef9).  */
 		buffer_address[5] = (char) 0xf9;
+	      }
 	    fragP->fr_fix += 6;	/* account for bra/jmp instruction */
 	    fix_new (fragP, fragP->fr_fix, 4, fragP->fr_symbol,
-		     fragP->fr_offset, 0, NO_RELOC);
+		     fragP->fr_offset, HAVE_LONG_BRANCH (current_architecture),
+		     NO_RELOC);
 	    fragP->fr_fix += 4;
 	  }
 
@@ -6745,6 +6777,7 @@ s_mri_endw (ignore)
  *
  *	-pic	Indicates PIC.
  *	-k	Indicates PIC.  (Sun 3 only.)
+ *      --pcrel Never turn PC-relative branches into absolute jumps.
  *
  *	--bitwise-or
  *		Permit `|' to be used in expressions.
@@ -6773,6 +6806,8 @@ struct option md_longopts[] = {
   {"disp-size-default-16", no_argument, NULL, OPTION_DISP_SIZE_DEFAULT_16},
 #define OPTION_DISP_SIZE_DEFAULT_32 (OPTION_MD_BASE + 6)
   {"disp-size-default-32", no_argument, NULL, OPTION_DISP_SIZE_DEFAULT_32},
+#define OPTION_PCREL (OPTION_MD_BASE + 7)
+  {"pcrel", no_argument, NULL, OPTION_PCREL},
   {NULL, no_argument, NULL, 0}
 };
 size_t md_longopts_size = sizeof(md_longopts);
@@ -6794,6 +6829,11 @@ md_parse_option (c, arg)
       flag_long_jumps = 1;
       break;
 
+    case OPTION_PCREL:		/* --pcrel means never turn PC-relative
+				   branches into absolute jumps.  */
+      flag_keep_pcrel = 1;
+      break;
+
     case 'A':
       if (*arg == 'm')
  	arg++;
@@ -6950,6 +6990,7 @@ md_show_usage (stream)
 			[default yes for 68020 and up]\n\
 -pic, -k		generate position independent code\n\
 -S			turn jbsr into jsr\n\
+--pcrel                 never turn PC-relative branches into absolute jumps\n\
 --register-prefix-optional\n\
 			recognize register names without prefix character\n\
 --bitwise-or		do not treat `|' as a comment character\n"));

gas/doc/c-m68k.texi

@@ -84,6 +84,13 @@ to instead assume that the displacement is 16 bits.  In this case,
 @samp{disp} is a 16 bit value.  You may use the
 @samp{--disp-size-default-32} option to restore the default behaviour.
 
+@cindex @samp{--pcrel}
+Always generate PC relative branches.  Actually what this option really
+does is to prevent PC relative branches from being turned into absolute
+jumps.  If this cannot be done (because the specific architecture does
+not have a suitable PC relative branch instruction), the assembler will
+generate an error message.
+
 @cindex @samp{-m68000} and related options
 @cindex architecture options, M680x0
 @cindex M680x0 architecture options

gas/po/POTFILES.in

@@ -126,18 +126,18 @@ ecoff.c
 ecoff.h
 ehopt.c
 ehopt.c
-emul-target.h
 emul.h
+emul-target.h
 expr.c
 expr.c
 expr.h
 flonum-copy.c
 flonum-copy.c
-flonum-konst.c
-flonum-konst.c
-flonum-mult.c
-flonum-mult.c
 flonum.h
+flonum-konst.c
+flonum-konst.c
+flonum-mult.c
+flonum-mult.c
 frags.c
 frags.c
 frags.h