Initial revision

From-SVN: r11131

gcc/config/i386/ptx4-i.h

+/* Target definitions for GNU compiler for Intel 80386 running Dynix/ptx v4
+   Copyright (C) 1996 Free Software Foundation, Inc.
+
+   Modified from sysv4.h
+   Originally written by Ron Guilmette (rfg@netcom.com).
+   Modified by Tim Wright (timw@sequent.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.  */
+
+#include "i386/i386.h"	/* Base i386 target machine definitions */
+#include "i386/att.h"	/* Use the i386 AT&T assembler syntax */
+#include "ptx4.h"	/* Rest of definitions (non architecture dependent) */
+
+#undef TARGET_VERSION
+#define TARGET_VERSION fprintf (stderr, " (i386 Sequent Dynix/ptx Version 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)
+
+/* Define which macros to predefine.  _SEQUENT_ 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_SEQUENT_ -Asystem(unix) -Asystem(ptx4) -Acpu(i386) -Amachine(i386)"
+
+/* This is how to output assembly code to define a `float' constant.
+   We always have to use a .long pseudo-op to do this because the native
+   SVR4 ELF assembler is buggy and it generates incorrect values when we
+   try to use the .float pseudo-op instead.  */
+
+#undef ASM_OUTPUT_FLOAT
+#define ASM_OUTPUT_FLOAT(FILE,VALUE)					\
+do { long value;							\
+     REAL_VALUE_TO_TARGET_SINGLE ((VALUE), value);			\
+     if (sizeof (int) == sizeof (long))					\
+         fprintf((FILE), "%s\t0x%x\n", ASM_LONG, value);		\
+     else								\
+         fprintf((FILE), "%s\t0x%lx\n", ASM_LONG, value);		\
+   } while (0)
+
+/* This is how to output assembly code to define a `double' constant.
+   We always have to use a pair of .long pseudo-ops to do this because
+   the native SVR4 ELF assembler is buggy and it generates incorrect
+   values when we try to use the the .double pseudo-op instead.  */
+
+#undef ASM_OUTPUT_DOUBLE
+#define ASM_OUTPUT_DOUBLE(FILE,VALUE)					\
+do { long value[2];							\
+     REAL_VALUE_TO_TARGET_DOUBLE ((VALUE), value);			\
+     if (sizeof (int) == sizeof (long))					\
+       {								\
+         fprintf((FILE), "%s\t0x%x\n", ASM_LONG, value[0]);		\
+         fprintf((FILE), "%s\t0x%x\n", ASM_LONG, value[1]);		\
+       }								\
+     else								\
+       {								\
+         fprintf((FILE), "%s\t0x%lx\n", ASM_LONG, value[0]);		\
+         fprintf((FILE), "%s\t0x%lx\n", ASM_LONG, value[1]);		\
+       }								\
+   } while (0)
+
+
+#undef ASM_OUTPUT_LONG_DOUBLE
+#define ASM_OUTPUT_LONG_DOUBLE(FILE,VALUE)				\
+do { long value[3];							\
+     REAL_VALUE_TO_TARGET_LONG_DOUBLE ((VALUE), value);			\
+     if (sizeof (int) == sizeof (long))					\
+       {								\
+         fprintf((FILE), "%s\t0x%x\n", ASM_LONG, value[0]);		\
+         fprintf((FILE), "%s\t0x%x\n", ASM_LONG, value[1]);		\
+         fprintf((FILE), "%s\t0x%x\n", ASM_LONG, value[2]);		\
+       }								\
+     else								\
+       {								\
+         fprintf((FILE), "%s\t0x%lx\n", ASM_LONG, value[0]);		\
+         fprintf((FILE), "%s\t0x%lx\n", ASM_LONG, value[1]);		\
+         fprintf((FILE), "%s\t0x%lx\n", ASM_LONG, value[2]);		\
+       }								\
+   } while (0)
+
+/* 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 (gnu regno = 0)
+	1 for %ecx (gnu regno = 2)
+	2 for %edx (gnu regno = 1)
+	3 for %ebx (gnu regno = 3)
+	4 for %esp (gnu regno = 7)
+	5 for %ebp (gnu regno = 6)
+	6 for %esi (gnu regno = 4)
+	7 for %edi (gnu regno = 5)
+
+   The following three DWARF register numbers are never generated by
+   the SVR4 C compiler or by the GNU compilers, but SDB on x86/svr4
+   believes these numbers have these meanings.
+
+	8  for %eip    (no gnu equivalent)
+	9  for %eflags (no gnu equivalent)
+	10 for %trapno (no gnu equivalent)
+
+   It is not at all clear how we should number the FP stack registers
+   for the x86 architecture.  If the version of SDB on x86/svr4 were
+   a bit less brain dead with respect to floating-point then we would
+   have a precedent to follow with respect to DWARF register numbers
+   for x86 FP registers, but the SDB on x86/svr4 is so completely
+   broken with respect to FP registers that it is hardly worth thinking
+   of it as something to strive for compatibility with.
+
+   The version of x86/svr4 SDB I have at the moment does (partially)
+   seem to believe that DWARF register number 11 is associated with
+   the x86 register %st(0), but that's about all.  Higher DWARF
+   register numbers don't seem to be associated with anything in
+   particular, and even for DWARF regno 11, SDB only seems to under-
+   stand that it should say that a variable lives in %st(0) (when
+   asked via an `=' command) if we said it was in DWARF regno 11,
+   but SDB still prints garbage when asked for the value of the
+   variable in question (via a `/' command).
+
+   (Also note that the labels SDB prints for various FP stack regs
+   when doing an `x' command are all wrong.)
+
+   Note that these problems generally don't affect the native SVR4
+   C compiler because it doesn't allow the use of -O with -g and
+   because when it is *not* optimizing, it allocates a memory
+   location for each floating-point variable, and the memory
+   location is what gets described in the DWARF AT_location
+   attribute for the variable in question.
+
+   Regardless of the severe mental illness of the x86/svr4 SDB, we
+   do something sensible here and we use the following DWARF
+   register numbers.  Note that these are all stack-top-relative
+   numbers.
+
+	11 for %st(0) (gnu regno = 8)
+	12 for %st(1) (gnu regno = 9)
+	13 for %st(2) (gnu regno = 10)
+	14 for %st(3) (gnu regno = 11)
+	15 for %st(4) (gnu regno = 12)
+	16 for %st(5) (gnu regno = 13)
+	17 for %st(6) (gnu regno = 14)
+	18 for %st(7) (gnu 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)+3 \
+ : (-1))
+
+/* 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)
+
+/* This is how to output an element of a case-vector that is relative.
+   This is only used for PIC code.  See comments by the `casesi' insn in
+   i386.md for an explanation of the expression this outputs. */
+
+#undef ASM_OUTPUT_ADDR_DIFF_ELT
+#define ASM_OUTPUT_ADDR_DIFF_ELT(FILE, VALUE, REL) \
+  fprintf (FILE, "\t.long _GLOBAL_OFFSET_TABLE_+[.-%s%d]\n", LPREFIX, VALUE)
+
+/* Indicate that jump tables go in the text section.  This is
+   necessary when compiling PIC code.  */
+
+#define JUMP_TABLES_IN_TEXT_SECTION