tower-as.h

gcc-2.95.3 Linux下最常用的C编译器

/* Definitions of target machine for GNU compiler.
   For NCR Tower 32/4x0 and 32/6x0 running System V Release 3.
   Copyright (C) 1990, 1993, 1994, 1996, 1997 Free Software Foundation, Inc.
   Contributed by Robert Andersson ([e-mail]), International Systems,
   Oslo, Norway.

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.  */


/* This file outputs assembler source suitable for the native Tower as
   and with sdb debugging symbols.  See tower.h for more comments.

   This file was based on m68k.h, hp320.h and 3b1.h as of the
   1.37.1 version.  */

#include "m68k/tower.h"
#undef SELECT_RTX_SECTION

/* Use default settings for system V.3.  */

#include "svr3.h"

/* Names to predefine in the preprocessor for this target machine.  */

#define CPP_PREDEFINES "-Dunix -Dtower32 -Dtower32_600 -D__motorola__ -Asystem(unix) -Asystem(svr3) -Acpu(m68k) -Amachine(m68k)"

/* Define __HAVE_68881 in preprocessor only if -m68881 is specified.
   This will control the use of inline 68881 insns in certain macros.
   Also, define special define used to identify the Tower assembler.  */

#define CPP_SPEC "-D__TOWER_ASM__ %{m68881:-D__HAVE_68881__}"

/* We don't want local labels to start with period.
   See ASM_OUTPUT_INTERNAL_LABEL.  */
#undef LOCAL_LABEL_PREFIX
#define LOCAL_LABEL_PREFIX ""

/* The prefix to add to user-visible assembler symbols.  */
/* We do not want leading underscores.  */

#undef USER_LABEL_PREFIX
#define USER_LABEL_PREFIX ""

/* These four macros control how m68k.md is expanded.  */

#define MOTOROLA		/* Use Motorola syntax rather than "MIT" */
#define SGS			/* Uses SGS assembler */
#define SGS_CMP_ORDER		/* Takes cmp operands in reverse order */
#define SGS_NO_LI		/* Suppress jump table label usage */

/* Turn on SDB debugging info.  */

#define SDB_DEBUGGING_INFO

/* This is only useful if gdb is changed, but doesn't harm anyway.  */

#define ASM_IDENTIFY_GCC(FILE) \
  fprintf (FILE, "gcc2_compiled%%:\n")

/* All the ASM_OUTPUT macros need to conform to the Tower as syntax.  */

#define ASM_OUTPUT_SOURCE_FILENAME(FILE, FILENAME) \
  do {						   \
    fprintf (FILE, "\tfile\t");			   \
    output_quoted_string (FILE, FILENAME);	   \
    fprintf (FILE, "\n");			   \
    fprintf (FILE, "section ~init,\"x\"\n");	   \
    fprintf (FILE, "section ~fini,\"x\"\n");	   \
    fprintf (FILE, "section ~rodata,\"x\"\n");   \
    fprintf (FILE, "text\n");			   \
  } while (0)

#define ASM_OUTPUT_SOURCE_LINE(FILE, LINENO)	\
  fprintf (FILE, "\tln\t%d\n",			\
	   (sdb_begin_function_line		\
	    ? last_linenum - sdb_begin_function_line : 1))

#undef ASM_OUTPUT_IDENT
#define ASM_OUTPUT_IDENT(FILE, NAME) \
  fprintf (FILE, "\tident\t\"%s\" \n", NAME)

#define ASM_OUTPUT_ASCII(FILE,PTR,LEN) \
  do { register int sp = 0, lp = 0; \
    fprintf ((FILE), "\tbyte\t"); \
  loop: \
    if ((PTR)[sp] > ' ' && ! ((PTR)[sp] & 0x80) && (PTR)[sp] != '\\') \
      { lp += 3; \
	fprintf ((FILE), "'%c", (PTR)[sp]); } \
    else \
      { lp += 5; \
	fprintf ((FILE), "0x%x", (PTR)[sp]); } \
    if (++sp < (LEN)) \
      {	if (lp > 60) \
	  { lp = 0; \
	    fprintf ((FILE), "\n\tbyte\t"); }	\
	else \
	  putc (',', (FILE)); \
	goto loop; } \
    putc ('\n', (FILE)); } while (0)

/* Translate Motorola opcodes such as `jbeq'
   into SGS/Tower opcodes such as `beq.w'.
   Change `move' to `mov'.
   Change `cmpm' to `cmp'.
   Change `divsl' to `tdivs'.
   Change `divul' to `tdivu'.
   Change `ftst' to `ftest'.
   Change `fmove' to `fmov'.  */

#define ASM_OUTPUT_OPCODE(FILE, PTR)			\
{ if ((PTR)[0] == 'j' && (PTR)[1] == 'b')		\
    { ++(PTR);						\
      while (*(PTR) != ' ')				\
	{ putc (*(PTR), (FILE)); ++(PTR); }		\
      fprintf ((FILE), ".w"); }				\
  else if ((PTR)[0] == 'm' && (PTR)[1] == 'o'		\
	   && (PTR)[2] == 'v' && (PTR)[3] == 'e')	\
    { fprintf ((FILE), "mov"); (PTR) += 4; }		\
  else if ((PTR)[0] == 'c' && (PTR)[1] == 'm'		\
	   && (PTR)[2] == 'p' && (PTR)[3] == 'm')	\
    { fprintf ((FILE), "cmp"); (PTR) += 4; }		\
  else if ((PTR)[0] == 'd' && (PTR)[1] == 'i'		\
	   && (PTR)[2] == 'v' && (PTR)[3] == 's'	\
	   && (PTR)[4] == 'l')				\
    { fprintf ((FILE), "tdivs"); (PTR) += 5; }		\
  else if ((PTR)[0] == 'd' && (PTR)[1] == 'i'		\
	   && (PTR)[2] == 'v' && (PTR)[3] == 'u'	\
	   && (PTR)[4] == 'l')				\
    { fprintf ((FILE), "tdivu"); (PTR) += 5; }		\
  else if ((PTR)[0] == 'f' && (PTR)[1] == 't'		\
	   && (PTR)[2] == 's' && (PTR)[3] == 't')	\
    { fprintf ((FILE), "ftest"); (PTR) += 4; }		\
  else if ((PTR)[0] == 'f' && (PTR)[1] == 'm'		\
	   && (PTR)[2] == 'o' && (PTR)[3] == 'v' 	\
	   && (PTR)[4] == 'e')				\
    { fprintf ((FILE), "fmov"); (PTR) += 5; }		\
}



/* Override parts of m68k.h to fit the Tower assembler.
   This section needs to track changes done to m68k.h in the future.  */

#undef TARGET_VERSION
#define TARGET_VERSION fprintf (stderr, " (68k, Motorola/SGS/Tower32 syntax)");

#undef FUNCTION_BLOCK_PROFILER
#define FUNCTION_BLOCK_PROFILER(FILE, LABELNO)				\
  do {									\
    char label1[20], label2[20];					\
    ASM_GENERATE_INTERNAL_LABEL (label1, "LPBX", 0);			\
    ASM_GENERATE_INTERNAL_LABEL (label2, "LPI", LABELNO);		\
    fprintf (FILE, "\ttst.l %s\n\tbne %s\n\tpea %s\n\tjsr __bb_init_func\n\taddq.l &4,%%sp\n",	\
	     label1, label2, label1);					\
    ASM_OUTPUT_INTERNAL_LABEL (FILE, "LPI", LABELNO);			\
    putc ('\n', FILE);						\
    } while (0)

#undef BLOCK_PROFILER
#define BLOCK_PROFILER(FILE, BLOCKNO)				\
  do {								\
    char label[20];						\
    ASM_GENERATE_INTERNAL_LABEL (label, "LPBX", 2);		\
    fprintf (FILE, "\taddq.l &1,%s+%d\n", label, 4 * BLOCKNO);	\
    } while (0)

#undef FUNCTION_PROFILER
#define FUNCTION_PROFILER(FILE, LABEL_NO)	\
    fprintf (FILE, "\tmov.l &LP%%%d,%%a0\n\tjsr mcount%%\n", (LABEL_NO))

#undef FUNCTION_EXTRA_EPILOGUE
#define FUNCTION_EXTRA_EPILOGUE(FILE, SIZE)				\
  { extern int current_function_returns_pointer;			\
    if ((current_function_returns_pointer) &&				\
      ! find_equiv_reg (0, get_last_insn (), 0, 0, 0, 8, Pmode))        \
      asm_fprintf (FILE, "\tmov.l %Rd0,%Ra0\n"); } 

/* This is how to output an insn to push a register on the stack.
   It need not be very fast code.  */

#undef ASM_OUTPUT_REG_PUSH
#define ASM_OUTPUT_REG_PUSH(FILE,REGNO)  \
  fprintf (FILE, "\tmov.l %s,-(%%sp)\n", reg_names[REGNO])

/* This is how to output an insn to pop a register from the stack.
   It need not be very fast code.  */

#undef ASM_OUTPUT_REG_POP
#define ASM_OUTPUT_REG_POP(FILE,REGNO)  \
  fprintf (FILE, "\tmov.l (%%sp)+,%s\n", reg_names[REGNO])

#undef ASM_FILE_START
#define ASM_FILE_START(FILE) \
( fprintf (FILE, "#NO_APP\n"), \
  output_file_directive ((FILE), main_input_filename))

#undef TEXT_SECTION_ASM_OP
#define TEXT_SECTION_ASM_OP "text"

#undef DATA_SECTION_ASM_OP
#define DATA_SECTION_ASM_OP "data"

/* This says how to output an assembler line to define a global common symbol.
   We use SIZE rather than ROUNDED, as this is what the native cc does.  */

#undef ASM_OUTPUT_COMMON
#define ASM_OUTPUT_COMMON(FILE, NAME, SIZE, ROUNDED)  \
( fputs ("\tcomm ", (FILE)),			\
  assemble_name ((FILE), (NAME)),		\
  fprintf ((FILE), ",%d\n", ((SIZE) == 0) ? (ROUNDED) : (SIZE)))

/* This says how to output an assembler line to define a local common symbol.
   We use SIZE rather than ROUNDED, as this is what the native cc does.  */

#undef ASM_OUTPUT_LOCAL
#define ASM_OUTPUT_LOCAL(FILE, NAME, SIZE, ROUNDED)  \
( fputs ("\tlcomm ", (FILE)),			\
  assemble_name ((FILE), (NAME)),		\
  fprintf ((FILE), ",%d\n", ((SIZE) == 0) ? (ROUNDED) : (SIZE)))

/* Store in OUTPUT a string (made with alloca) containing
   an assembler-name for a local static variable named NAME.
   LABELNO is an integer which is different for each call.  */

#undef ASM_FORMAT_PRIVATE_NAME
#define ASM_FORMAT_PRIVATE_NAME(OUTPUT, NAME, LABELNO)	\
( (OUTPUT) = (char *) alloca (strlen ((NAME)) + 11),	\
  sprintf ((OUTPUT), "%s%%%%%d", (NAME), (LABELNO)))
 
/* This is the command to make the user-level label named NAME
   defined for reference from other files.  */

#undef GLOBAL_ASM_OP
#define GLOBAL_ASM_OP "global"

#undef ASM_GENERATE_INTERNAL_LABEL
#define ASM_GENERATE_INTERNAL_LABEL(LABEL, PREFIX, NUM)	\
  sprintf ((LABEL), "%s%%%d", (PREFIX), (NUM))

#undef ASM_OUTPUT_INTERNAL_LABEL
#define ASM_OUTPUT_INTERNAL_LABEL(FILE,PREFIX,NUM)	\
  fprintf ((FILE), "%s%%%d:\n", (PREFIX), (NUM))

#undef ASM_OUTPUT_CASE_LABEL
#define ASM_OUTPUT_CASE_LABEL(FILE,PREFIX,NUM,TABLE)			\
  fprintf (FILE, "\tswbeg &%d\n%s%%%d:\n",				\
           XVECLEN (PATTERN (TABLE), 1), (PREFIX), (NUM));		\

#undef ASM_OUTPUT_DOUBLE
#define ASM_OUTPUT_DOUBLE(FILE,VALUE)  \
do { long l[2];						\
     REAL_VALUE_TO_TARGET_DOUBLE (VALUE, l);		\
     fprintf (FILE, "\tlong 0x%x,0x%x\n", l[0], l[1]); \
   } while (0)

#undef ASM_OUTPUT_LONG_DOUBLE
#define ASM_OUTPUT_LONG_DOUBLE(FILE,VALUE)  				\
do { long l[3];								\
     REAL_VALUE_TO_TARGET_LONG_DOUBLE (VALUE, l);			\
     fprintf (FILE, "\tlong 0x%x,0x%x,0x%x\n", l[0], l[1], l[2]);	\
   } while (0)

#undef ASM_OUTPUT_FLOAT
#define ASM_OUTPUT_FLOAT(FILE,VALUE)  \
do { long l;					\
     REAL_VALUE_TO_TARGET_SINGLE (VALUE, l);	\
     fprintf ((FILE), "\tlong 0x%x\n", l);	\
   } while (0)

/* This is how to output an assembler line defining an `int' constant.  */

#undef ASM_OUTPUT_INT
#define ASM_OUTPUT_INT(FILE,VALUE)  \
( fprintf (FILE, "\tlong "),			\
  output_addr_const (FILE, (VALUE)),		\
  fprintf (FILE, "\n"))

/* Likewise for `char' and `short' constants.  */

#undef ASM_OUTPUT_SHORT
#define ASM_OUTPUT_SHORT(FILE,VALUE)  \
( fprintf (FILE, "\tshort "),			\
  output_addr_const (FILE, (VALUE)),		\
  fprintf (FILE, "\n"))

#undef ASM_OUTPUT_CHAR
#define ASM_OUTPUT_CHAR(FILE,VALUE)  \
( fprintf (FILE, "\tbyte "),			\
  output_addr_const (FILE, (VALUE)),		\
  fprintf (FILE, "\n"))

/* This is how to output an assembler line for a numeric constant byte.  */

#undef ASM_OUTPUT_BYTE