Initial revision

From-SVN: r19176

gcc/config/i386/rtemself.h

+/* Definitions for Intel 386 running Linux-based GNU systems with ELF format.
+   Copyright (C) 1994, 1995, 1996, 1997, 1998 Free Software Foundation, Inc.
+   Contributed by Eric Youngdale.
+   Modified for stabs-in-ELF by H.J. Lu.
+
+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.  */
+
+#define LINUX_DEFAULT_ELF
+
+/* A lie, I guess, but the general idea behind linux/ELF is that we are
+   supposed to be outputting something that will assemble under SVr4.
+   This gets us pretty close.  */
+#include <i386/i386.h>	/* Base i386 target machine definitions */
+#include <i386/att.h>	/* Use the i386 AT&T assembler syntax */
+#include <linux.h>	/* some common stuff */
+
+#undef TARGET_VERSION
+#define TARGET_VERSION fprintf (stderr, " (i386 RTEMS with ELF)");
+
+/* The svr4 ABI for the i386 says that records and unions are returned
+   in memory.  */
+#undef DEFAULT_PCC_STRUCT_RETURN
+#define DEFAULT_PCC_STRUCT_RETURN 1
+
+/* 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
+
+/* Copy this from the svr4 specifications... */
+/* 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))
+
+/* Output assembler code to FILE to increment profiler label # LABELNO
+   for profiling a function entry.  */
+
+#undef FUNCTION_PROFILER
+#define FUNCTION_PROFILER(FILE, LABELNO)  \
+{									\
+  if (flag_pic)								\
+    {									\
+      fprintf (FILE, "\tleal %sP%d@GOTOFF(%%ebx),%%edx\n",		\
+	       LPREFIX, (LABELNO));					\
+      fprintf (FILE, "\tcall *mcount@GOT(%%ebx)\n");			\
+    }									\
+  else									\
+    {									\
+      fprintf (FILE, "\tmovl $%sP%d,%%edx\n", LPREFIX, (LABELNO));	\
+      fprintf (FILE, "\tcall mcount\n");				\
+    }									\
+}
+
+#undef SIZE_TYPE
+#define SIZE_TYPE "unsigned int"
+ 
+#undef PTRDIFF_TYPE
+#define PTRDIFF_TYPE "int"
+  
+#undef WCHAR_TYPE
+#define WCHAR_TYPE "long int"
+   
+#undef WCHAR_TYPE_SIZE
+#define WCHAR_TYPE_SIZE BITS_PER_WORD
+    
+#undef CPP_PREDEFINES
+#define CPP_PREDEFINES  "-Di386 -Drtems -D__rtems__ \
+   -Asystem(rtems) -Acpu(i386) -Amachine(i386)"
+
+/* Get perform_* macros to build libgcc.a.  */
+#include "i386/perform.h"
+
+/* 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)
+
+#undef STARTFILE_SPEC
+#define STARTFILE_SPEC  "crt0.o%s"
+
+#undef ENDFILE_SPEC
+