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[thirdparty/gcc.git] / gcc / config / m68k / m68kelf.h

/* m68kelf support, derived from m68kv4.h */

/* Target definitions for GNU compiler for mc680x0 running System V.4
   Copyright (C) 1991-2020 Free Software Foundation, Inc.

   Written by Ron Guilmette (rfg@netcom.com) and Fred Fish (fnf@cygnus.com).

This file is part of GCC.

GCC 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 3, or (at your option)
any later version.

GCC 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 GCC; see the file COPYING3.  If not see
<http://www.gnu.org/licenses/>.  */


#ifndef SWBEG_ASM_OP
#define SWBEG_ASM_OP "\t.swbeg\t"
#endif

/* Here are three 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 ""

/* config/m68k.md has an explicit reference to the program counter,
   prefix this by the register prefix.  */

#define ASM_RETURN_CASE_JUMP				\
  do {							\
    if (TARGET_COLDFIRE)				\
      {							\
	if (ADDRESS_REG_P (operands[0]))		\
	  return "jmp %%pc@(2,%0:l)";			\
	else if (TARGET_LONG_JUMP_TABLE_OFFSETS)	\
	  return "jmp %%pc@(2,%0:l)";			\
	else						\
	  return "ext%.l %0\n\tjmp %%pc@(2,%0:l)";	\
      }							\
    else if (TARGET_LONG_JUMP_TABLE_OFFSETS)		\
      return "jmp %%pc@(2,%0:l)";			\
    else						\
      return "jmp %%pc@(2,%0:w)";			\
  } while (0)

/* 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)				\
do {								\
  if ((LOG) > 0)						\
    fprintf ((FILE), "%s%u\n", ALIGN_ASM_OP, 1 << (LOG));	\
} while (0)

/* 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 M68K_STRUCT_VALUE_REGNUM
#define M68K_STRUCT_VALUE_REGNUM A0_REG

/* The static chain regnum defaults to a0, but we use that for
   structure return, so have to use a1 for the static chain.  */

#undef STATIC_CHAIN_REGNUM
#define STATIC_CHAIN_REGNUM A1_REG
#undef M68K_STATIC_CHAIN_REG_NAME
#define M68K_STATIC_CHAIN_REG_NAME REGISTER_PREFIX "a1"

#define ASM_COMMENT_START "|"

/* Define how the m68k registers should be numbered for Dwarf output.
   The numbering provided here should be compatible with the native
   SVR4 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)

#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

#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", (int)(SIZE)))

#define ASM_OUTPUT_LOCAL(FILE, NAME, SIZE, ROUNDED)  \
( fputs (".lcomm ", (FILE)),			\
  assemble_name ((FILE), (NAME)),		\
  fprintf ((FILE), ",%u\n", (int)(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

/* 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), "%s&%d\n", SWBEG_ASM_OP, XVECLEN (PATTERN (TABLE), 1))
/* end of stuff from m68kv4.h */

#undef ENDFILE_SPEC
#define ENDFILE_SPEC "crtend.o%s"

#undef	STARTFILE_SPEC
#define STARTFILE_SPEC "crtbegin.o%s"

#ifndef BSS_SECTION_ASM_OP
#define BSS_SECTION_ASM_OP	"\t.section\t.bss"
#endif

#ifndef ASM_OUTPUT_ALIGNED_BSS
#define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
  asm_output_aligned_bss (FILE, DECL, NAME, SIZE, ALIGN)
#endif