Add m68k-elf port from Cygnus gcc sources.

	* configure.in (m68020-*-elf*, m68k-*-elf*): New targets.
	* configure: Rebuild.
	* config/elfos.h: New file.
	* config/m68k/m68020-elf.h, config/m68k/m68kelf.h,
	config/m68k/t-m68kelf: New file.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@23835 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 266 insertions, 0 deletions

diff --git a/gcc/config/m68k/m68kelf.h b/gcc/config/m68k/m68kelf.h
new file mode 100644
index 00000000000..25f2c383c0a
--- /dev/null
+++ b/gcc/config/m68k/m68kelf.h
@@ -0,0 +1,266 @@
+/* m68kelf support, derived from m68kv4.h */
+
+/* Target definitions for GNU compiler for mc680x0 running System V.4
+   Copyright (C) 1991, 1993 Free Software Foundation, Inc.
+
+   Written by Ron Guilmette (rfg@netcom.com) and Fred Fish (fnf@cygnus.com).
+
+This file is part of GNU CC.
+
+GNU CC is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU CC is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU CC; see the file COPYING.  If not, write to
+the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+/* #notinclude "m68k/sgs.h"	/* The m68k/SVR4 assembler is SGS based */
+
+/* These are necessary for -fpic/-fPIC to work correctly.  */
+#ifndef MOTOROLA
+#define MOTOROLA                /* Use MOTOROLA syntax.  */
+#endif
+#ifdef  USE_GAS  /* when present, forces jsbr instead of jsr.  */
+#undef  USE_GAS
+#endif
+
+#ifndef SWBEG_ASM_OP
+#define SWBEG_ASM_OP ".swbeg"
+#endif
+
+/* Here are four prefixes that are used by asm_fprintf to
+   facilitate customization for alternate assembler syntaxes.
+   Machines with no likelihood of an alternate syntax need not
+   define these and need not use asm_fprintf.  */
+
+/* The prefix for register names.  Note that REGISTER_NAMES
+   is supposed to include this prefix. Also note that this is NOT an
+   fprintf format string, it is a literal string */
+
+#undef REGISTER_PREFIX
+#define REGISTER_PREFIX "%"
+
+/* The prefix for local (compiler generated) labels.
+   These labels will not appear in the symbol table. */
+
+#undef LOCAL_LABEL_PREFIX
+#define LOCAL_LABEL_PREFIX "."
+
+/* The prefix to add to user-visible assembler symbols. */
+
+#undef USER_LABEL_PREFIX
+#define USER_LABEL_PREFIX ""
+
+/* The prefix for immediate operands.  */
+
+#undef  IMMEDIATE_PREFIX
+#define IMMEDIATE_PREFIX "#"
+
+/* In the machine description we can't use %R, because it will not be seen
+   by ASM_FPRINTF.  (Isn't that a design bug?).  */
+
+#undef REGISTER_PREFIX_MD
+#define REGISTER_PREFIX_MD "%%"
+
+/* config/m68k.md has an explicit reference to the program counter,
+   prefix this by the register prefix.  */
+
+#define ASM_RETURN_CASE_JUMP    return "jmp %%pc@(2,%0:w)"
+
+/* How to refer to registers in assembler output.
+   This sequence is indexed by compiler's hard-register-number.
+   Motorola format uses different register names than defined 
+   in m68k.h.  */
+
+#undef REGISTER_NAMES
+
+#define REGISTER_NAMES \
+{"%d0",   "%d1",   "%d2",   "%d3",   "%d4",   "%d5",   "%d6",   "%d7",	     \
+ "%a0",   "%a1",   "%a2",   "%a3",   "%a4",   "%a5",   "%a6",   "%sp",	     \
+ "%fp0",  "%fp1",  "%fp2",  "%fp3",  "%fp4",  "%fp5",  "%fp6",  "%fp7" }
+
+/* This is how to output an assembler line that says to advance the
+   location counter to a multiple of 2**LOG bytes.  */
+
+#undef ASM_OUTPUT_ALIGN
+#define ASM_OUTPUT_ALIGN(FILE,LOG)				\
+  if ((LOG) > 0)						\
+    fprintf ((FILE), "\t%s \t%u\n", ALIGN_ASM_OP, 1 << (LOG));	\
+  else if ((LOG) > 31)						\
+    abort ();
+
+/* Use proper assembler syntax for these macros.  */
+#undef ASM_OUTPUT_REG_PUSH
+#define ASM_OUTPUT_REG_PUSH(FILE,REGNO)  \
+  asm_fprintf (FILE, "\t%Omove.l %s,-(%Rsp)\n", reg_names[REGNO])
+
+#undef ASM_OUTPUT_REG_POP
+#define ASM_OUTPUT_REG_POP(FILE,REGNO)  \
+  asm_fprintf (FILE, "\t%Omove.l (%Rsp)+,%s\n", reg_names[REGNO])
+
+/*  Override the definition of NO_DOLLAR_IN_LABEL in svr4.h, for special
+    g++ assembler names.  When this is defined, g++ uses embedded '.'
+    characters and some m68k assemblers have problems with this.  The
+    chances are much greater that any particular assembler will permit
+    embedded '$' characters. */
+
+#undef NO_DOLLAR_IN_LABEL
+
+/* Define PCC_STATIC_STRUCT_RETURN if the convention on the target machine
+   is to use the nonreentrant technique for returning structure and union
+   values, as commonly implemented by the AT&T Portable C Compiler (PCC).
+   When defined, the gcc option -fpcc-struct-return can be used to cause
+   this form to be generated.  When undefined, the option does nothing.
+   For m68k SVR4, the convention is to use a reentrant technique compatible
+   with the gcc default, so override the definition of this macro in m68k.h */
+
+#undef PCC_STATIC_STRUCT_RETURN
+
+/* Local common symbols are declared to the assembler with ".lcomm" rather
+   than ".bss", so override the definition in svr4.h */
+
+#undef BSS_ASM_OP
+#define BSS_ASM_OP	".lcomm"
+
+/* Register in which address to store a structure value is passed to a
+   function.  The default in m68k.h is a1.  For m68k/SVR4 it is a0. */
+
+#undef STRUCT_VALUE_REGNUM
+#define STRUCT_VALUE_REGNUM 8
+
+#define ASM_COMMENT_START "|"
+
+#undef TYPE_OPERAND_FMT
+#define TYPE_OPERAND_FMT      "@%s"
+
+/* Define how the m68k registers should be numbered for Dwarf output.
+   The numbering provided here should be compatible with the native
+   SVR4 SDB debugger in the m68k/SVR4 reference port, where d0-d7
+   are 0-7, a0-a8 are 8-15, and fp0-fp7 are 16-23. */
+
+#undef DBX_REGISTER_NUMBER
+#define DBX_REGISTER_NUMBER(REGNO) (REGNO)
+
+/* The ASM_OUTPUT_SKIP macro is first defined in m68k.h, using ".skip".
+   It is then overridden by m68k/sgs.h to use ".space", and again by svr4.h
+   to use ".zero".  The m68k/SVR4 assembler uses ".space", so repeat the
+   definition from m68k/sgs.h here.  Note that ASM_NO_SKIP_IN_TEXT is
+   defined in m68k/sgs.h, so we don't have to repeat it here. */
+
+#undef ASM_OUTPUT_SKIP
+#define ASM_OUTPUT_SKIP(FILE,SIZE)  \
+  fprintf (FILE, "\t%s %u\n", SPACE_ASM_OP, (SIZE))
+
+#if 0
+/* SVR4 m68k assembler is bitching on the `comm i,1,1' which askes for 
+   1 byte alignment. Don't generate alignment for COMMON seems to be
+   safer until we the assembler is fixed. */
+#undef ASM_OUTPUT_ALIGNED_COMMON
+/* Same problem with this one.  */
+#undef ASM_OUTPUT_ALIGNED_LOCAL
+#endif
+
+/* The `string' directive on m68k svr4 does not handle string with
+   escape char (ie., `\') right. Use normal way to output ASCII bytes
+   seems to be safer. */
+#undef ASM_OUTPUT_ASCII
+#define ASM_OUTPUT_ASCII(FILE,PTR,LEN)				\
+do {								\
+  register int sp = 0, lp = 0, ch;				\
+  fprintf ((FILE), "\t%s ", BYTE_ASM_OP);			\
+  do {								\
+    ch = (PTR)[sp];						\
+    if (ch > ' ' && ! (ch & 0x80) && ch != '\\')		\
+      {								\
+	fprintf ((FILE), "'%c", ch);				\
+      }								\
+    else							\
+      {								\
+	fprintf ((FILE), "0x%x", ch);				\
+      }								\
+    if (++sp < (LEN))						\
+      {								\
+	if ((sp % 10) == 0)					\
+	  {							\
+	    fprintf ((FILE), "\n\t%s ", BYTE_ASM_OP);		\
+	  }							\
+	else							\
+	  {							\
+	    putc (',', (FILE));					\
+	  }							\
+      }								\
+  } while (sp < (LEN));						\
+  putc ('\n', (FILE));						\
+} while (0)
+
+/* SVR4 m68k assembler is bitching on the syntax `2.b'.
+   So use the "LLDnnn-LLnnn" format.  Define LLDnnn after the table.  */
+
+#undef ASM_OUTPUT_CASE_END
+#define ASM_OUTPUT_CASE_END(FILE,NUM,TABLE)				\
+do {									\
+  if (switch_table_difference_label_flag)				\
+    asm_fprintf ((FILE), "\t%s %LLD%d,%LL%d\n", SET_ASM_OP, (NUM), (NUM));\
+  switch_table_difference_label_flag = 0;				\
+} while (0)
+
+extern int switch_table_difference_label_flag;
+
+#undef ASM_OUTPUT_COMMON
+#undef ASM_OUTPUT_LOCAL
+#define ASM_OUTPUT_COMMON(FILE, NAME, SIZE, ROUNDED)  \
+( fputs (".comm ", (FILE)),			\
+  assemble_name ((FILE), (NAME)),		\
+  fprintf ((FILE), ",%u\n", (SIZE)))
+
+#define ASM_OUTPUT_LOCAL(FILE, NAME, SIZE, ROUNDED)  \
+( fputs (".lcomm ", (FILE)),			\
+  assemble_name ((FILE), (NAME)),		\
+  fprintf ((FILE), ",%u\n", (SIZE)))
+
+/* Currently, JUMP_TABLES_IN_TEXT_SECTION must be defined in order to
+   keep switch tables in the text section. */
+   
+#define JUMP_TABLES_IN_TEXT_SECTION 1
+
+/* Override the definition in svr4.h. In m68k svr4, using swbeg is the 
+   standard way to do switch table. */
+#undef ASM_OUTPUT_BEFORE_CASE_LABEL
+#define ASM_OUTPUT_BEFORE_CASE_LABEL(FILE,PREFIX,NUM,TABLE)		\
+  fprintf ((FILE), "\t%s &%d\n", SWBEG_ASM_OP, XVECLEN (PATTERN (TABLE), 1));
+
+/* In m68k svr4, a symbol_ref rtx can be a valid PIC operand if it is an
+   operand of a function call. */
+#undef LEGITIMATE_PIC_OPERAND_P
+#define LEGITIMATE_PIC_OPERAND_P(X) \
+  (! symbolic_operand (X, VOIDmode) \
+   || ((GET_CODE(X) == SYMBOL_REF) && SYMBOL_REF_FLAG(X)))
+
+/* Turn off function cse if we are doing PIC. We always want function call
+   to be done as `bsr foo@PLTPC', so it will force the assembler to create 
+   the PLT entry for `foo'. Doing function cse will cause the address of `foo'
+   to be loaded into a register, which is exactly what we want to avoid when
+   we are doing PIC on svr4 m68k. */
+#undef OVERRIDE_OPTIONS
+#define OVERRIDE_OPTIONS		\
+{					\
+  if (flag_pic) flag_no_function_cse = 1; \
+  if (! TARGET_68020 && flag_pic == 2)	\
+    error("-fPIC is not currently supported on the 68000 or 68010\n");	\
+}
+/* end of stuff from m68kv4.h */
+
+#undef SGS_CMP_ORDER
+
+#undef ENDFILE_SPEC
+#define ENDFILE_SPEC "crtend.o%s"
+
+#undef	STARTFILE_SPEC
+#define STARTFILE_SPEC "crtbegin.o%s"