Subversion Repositories openrisc_2011-10-31

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

/* Target definitions for GNU compiler for mc680x0 running System V.4

   Copyright (C) 1991, 1993, 2000, 2002, 2003, 2004, 2007

   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                                            \

          return "ext%.l %0\n\tjmp %%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 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)

#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

/* 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), "%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"

/* If defined, a C expression whose value is a string containing the

   assembler operation to identify the following data as

   uninitialized global data.  If not defined, and neither

   `ASM_OUTPUT_BSS' nor `ASM_OUTPUT_ALIGNED_BSS' are defined,

   uninitialized global data will be output in the data section if

   `-fno-common' is passed, otherwise `ASM_OUTPUT_COMMON' will be

   used.  */

#ifndef BSS_SECTION_ASM_OP

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

#endif

/* Like `ASM_OUTPUT_BSS' except takes the required alignment as a

   separate, explicit argument.  If you define this macro, it is used

   in place of `ASM_OUTPUT_BSS', and gives you more flexibility in

   handling the required alignment of the variable.  The alignment is

   specified as the number of bits.

   Try to use function `asm_output_aligned_bss' defined in file

   `varasm.c' when defining this macro.  */

#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