Initial revision

From-SVN: r237

gcc/config/i386/sysv4.h

+/* Target definitions for GNU compiler for Intel 80386 running System V.4
+   Copyright (C) 1991 Free Software Foundation, Inc.
+
+   Written by Ron Guilmette (rfg@ncd.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.  */
+
+#include "i386.h"	/* Base i386 target machine definitions */
+#include "att386.h"	/* Use the i386 AT&T assembler syntax */
+#include "svr4.h"	/* Definitions common to all SVR4 targets */
+
+#undef TARGET_VERSION
+#define TARGET_VERSION fprintf (stderr, " (i386 System V Release 4)");
+
+/* By default, target has a 80387.  */
+
+#define TARGET_DEFAULT 1
+
+/* Machines that use the AT&T assembler syntax
+   also return floating point values in an FP register.  */
+/* Define how to find the value returned by a function.
+   VALTYPE is the data type of the value (as a tree).
+   If the precise function being called is known, FUNC is its FUNCTION_DECL;
+   otherwise, FUNC is 0.  */
+
+#define VALUE_REGNO(MODE) \
+  (((MODE) == SFmode || (MODE) == DFmode) ? FIRST_FLOAT_REG : 0)
+
+/* 1 if N is a possible register number for a function value. */
+
+#define FUNCTION_VALUE_REGNO_P(N) ((N) == 0 || (N)== FIRST_FLOAT_REG)
+
+/* The svr4 ABI for the i386 says that records and unions are returned
+   in memory.  */
+
+#undef RETURN_IN_MEMORY
+#define RETURN_IN_MEMORY(TYPE) \
+  (TREE_CODE (TYPE) == RECORD_TYPE || TREE_CODE(TYPE) == UNION_TYPE)
+
+/* 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 \
+  "-Di386 -Dunix -D__svr4__ -Asystem(unix) -Acpu(i386) -Amachine(i386)"
+
+/* 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)
+
+/* Define the register numbers to be used in Dwarf debugging information.
+   The SVR4 reference port C compiler uses the following register numbers
+   in its Dwarf output code:
+
+	0 for %eax (regno = 0)
+	1 for %ecx (regno = 2)
+	2 for %edx (regno = 1)
+	3 for %ebx (regno = 3)
+	4 for %esp (regno = 7)
+	5 for %ebp (regno = 6)
+	6 for %esi (regno = 4)
+	7 for %edi (regno = 5)
+
+	8  for FP_REGS[tos]   (regno = 8)
+	9  for FP_REGS[tos-1] (regno = 9)
+	10 for FP_REGS[tos-2] (regno = 10)
+	11 for FP_REGS[tos-3] (regno = 11)
+	12 for FP_REGS[tos-4] (regno = 12)
+	13 for FP_REGS[tos-5] (regno = 13)
+	14 for FP_REGS[tos-6] (regno = 14)
+	15 for FP_REGS[tos-7] (regno = 15)
+*/
+
+#undef DBX_REGISTER_NUMBER
+#define DBX_REGISTER_NUMBER(n) \
+((n) == 0 ? 0 \
+ : (n) == 1 ? 2 \
+ : (n) == 2 ? 1 \
+ : (n) == 3 ? 3 \
+ : (n) == 4 ? 6 \
+ : (n) == 5 ? 7 \
+ : (n) == 6 ? 5 \
+ : (n) == 7 ? 4 \
+ : ((n) >= FIRST_STACK_REG && (n) <= LAST_STACK_REG) ? (n) \
+ : (abort (), 0))
+
+/* 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 unsigned char *_ascii_bytes = (unsigned char *) (STR);	\
+      register unsigned char *limit = _ascii_bytes + (LENGTH);		\
+      register unsigned bytes_in_chunk = 0;				\
+      for (; _ascii_bytes < limit; _ascii_bytes++)			\
+        {								\
+	  register 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) <= 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)