xref: /freebsd-10.2-release/contrib/gcc/config/i386/sysv4.h

/* Target definitions for GNU compiler for Intel 80386 running System V.4
   Copyright (C) 1991, 2001 Free Software Foundation, Inc.

   Written by Ron Guilmette (rfg@netcom.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, 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */


#undef TARGET_VERSION
#define TARGET_VERSION fprintf (stderr, " (i386 System V Release 4)");

/* The svr4 ABI for the i386 says that records and unions are returned
   in memory.  */

#undef RETURN_IN_MEMORY
#define RETURN_IN_MEMORY(TYPE) \
  (TYPE_MODE (TYPE) == BLKmode \
   || (VECTOR_MODE_P (TYPE_MODE (TYPE)) && int_size_in_bytes (TYPE) == 8))

/* Define which macros to predefine.  __svr4__ is our extension.  */
/* This used to define X86, but james@bigtex.cactus.org says that
   is supposed to be defined optionally by user programs--not by default.  */
#define CPP_PREDEFINES \
  "-Dunix -D__svr4__ -Asystem=unix -Asystem=svr4"

/* Output at beginning of assembler file.  */
/* The .file command should always begin the output.  */

#undef ASM_FILE_START
#define ASM_FILE_START(FILE)						\
  do {									\
	output_file_directive (FILE, main_input_filename);		\
	fprintf (FILE, "\t.version\t\"01.01\"\n");			\
  } while (0)

#undef DBX_REGISTER_NUMBER
#define DBX_REGISTER_NUMBER(n)  svr4_dbx_register_map[n]

/* The routine used to output sequences of byte values.  We use a special
   version of this for most svr4 targets because doing so makes the
   generated assembly code more compact (and thus faster to assemble)
   as well as more readable.  Note that if we find subparts of the
   character sequence which end with NUL (and which are shorter than
   STRING_LIMIT) we output those using ASM_OUTPUT_LIMITED_STRING.  */

#undef ASM_OUTPUT_ASCII
#define ASM_OUTPUT_ASCII(FILE, STR, LENGTH)				\
  do									\
    {									\
      register const unsigned char *_ascii_bytes =			\
        (const unsigned char *) (STR);					\
      register const unsigned char *limit = _ascii_bytes + (LENGTH);	\
      register unsigned bytes_in_chunk = 0;				\
      for (; _ascii_bytes < limit; _ascii_bytes++)			\
        {								\
	  register const unsigned char *p;				\
	  if (bytes_in_chunk >= 64)					\
	    {								\
	      fputc ('\n', (FILE));					\
	      bytes_in_chunk = 0;					\
	    }								\
	  for (p = _ascii_bytes; p < limit && *p != '\0'; p++)		\
	    continue;							\
	  if (p < limit && (p - _ascii_bytes) <= (long) STRING_LIMIT)	\
	    {								\
	      if (bytes_in_chunk > 0)					\
		{							\
		  fputc ('\n', (FILE));					\
		  bytes_in_chunk = 0;					\
		}							\
	      ASM_OUTPUT_LIMITED_STRING ((FILE), _ascii_bytes);		\
	      _ascii_bytes = p;						\
	    }								\
	  else								\
	    {								\
	      if (bytes_in_chunk == 0)					\
		fprintf ((FILE), "\t.byte\t");				\
	      else							\
		fputc (',', (FILE));					\
	      fprintf ((FILE), "0x%02x", *_ascii_bytes);		\
	      bytes_in_chunk += 5;					\
	    }								\
	}								\
      if (bytes_in_chunk > 0)						\
        fprintf ((FILE), "\n");						\
    }									\
  while (0)

/* A C statement (sans semicolon) to output to the stdio stream
   FILE the assembler definition of uninitialized global DECL named
   NAME whose size is SIZE bytes and alignment is ALIGN bytes.
   Try to use asm_output_aligned_bss to implement this macro.  */

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

/* Handle special EH pointer encodings.  Absolute, pc-relative, and
   indirect are handled automatically.  */
#define ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX(FILE, ENCODING, SIZE, ADDR, DONE) \
  do {									\
    if ((SIZE) == 4 && ((ENCODING) & 0x70) == DW_EH_PE_datarel)		\
      {									\
        fputs (ASM_LONG, FILE);						\
        assemble_name (FILE, XSTR (ADDR, 0));				\
	fputs (((ENCODING) & DW_EH_PE_indirect ? "@GOT" : "@GOTOFF"), FILE); \
        goto DONE;							\
      }									\
  } while (0)

/* Used by crtstuff.c to initialize the base of data-relative relocations.
   These are GOT relative on x86, so return the pic register.  */
#ifdef __PIC__
#define CRT_GET_RFIB_DATA(BASE)			\
  {						\
    register void *ebx_ __asm__("ebx");		\
    BASE = ebx_;				\
  }
#else
#define CRT_GET_RFIB_DATA(BASE)						\
  __asm__ ("call\t.LPR%=\n"						\
	   ".LPR%=:\n\t"						\
	   "popl\t%0\n\t"						\
	   /* Due to a GAS bug, this cannot use EAX.  That encodes	\
	      smaller than the traditional EBX, which results in the	\
	      offset being off by one.  */				\
	   "addl\t$_GLOBAL_OFFSET_TABLE_+[.-.LPR%=],%0"			\
	   : "=d"(BASE))
#endif

#undef CPP_SPEC
#define CPP_SPEC "%(cpp_cpu)"