Initial revision

From-SVN: r228

gcc/config/i386/sysv3.h

@@ -0,0 +1,127 @@
+/* Definitions for Intel 386 running system V.
+   Copyright (C) 1988 Free Software Foundation, Inc.
+
+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"
+
+/* Use default settings for system V.3.  */
+
+#include "svr3.h"
+
+/* Use the ATT assembler syntax.
+   This overrides at least one macro (ASM_OUTPUT_LABELREF) from svr3.h.  */
+
+#include "att386.h"
+
+/* By default, target has a 80387.  */
+
+#define TARGET_DEFAULT 1
+
+/* Use crt1.o as a startup file and crtn.o as a closing file.  */
+
+#define STARTFILE_SPEC  \
+  "%{pg:gcrt1.o%s}%{!pg:%{posix:%{p:mcrtp1.o%s}%{!p:crtp1.o%s}}%{!posix:%{p:mcrt1.o%s}%{!p:crt1.o%s}}} crtbegin.o%s\
+   %{p:-L/usr/lib/libp}%{pg:-L/usr/lib/libp}"
+
+#define LIB_SPEC "%{posix:-lcposix} %{shlib:-lc_s} -lc crtend.o%s crtn.o%s"
+
+/* Specify predefined symbols in preprocessor.  */
+
+#define CPP_PREDEFINES "-Dunix -Di386"
+
+#define CPP_SPEC "%{posix:-D_POSIX_SOURCE}"
+
+/* Writing `int' for a bitfield forces int alignment for the structure.  */
+
+#define PCC_BITFIELD_TYPE_MATTERS 1
+
+/* Don't write a `.optim' pseudo; this assembler doesn't handle them.  */
+
+#undef ASM_FILE_START_1
+#define ASM_FILE_START_1(FILE)
+
+/* 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)
+
+#if 0 /* This symbol is expected to exist only on BSD,
+	 and besides, it describes the host rather than the target.
+	 It certainly does not belong here.  */
+#ifndef MAXPATHLEN
+#define MAXPATHLEN 1024
+#endif
+#endif
+
+/* longjmp may fail to restore the registers if called from the same
+   function that called setjmp.  To compensate, the compiler avoids
+   putting variables in registers in functions that use both setjmp
+   and longjmp.  */
+
+#define NON_SAVING_SETJMP \
+  (current_function_calls_setjmp && current_function_calls_longjmp)
+
+/* longjmp may fail to restore the stack pointer if the saved frame
+   pointer is the same as the caller's frame pointer.  Requiring a frame
+   pointer in any function that calls setjmp or longjmp avoids this
+   problem, unless setjmp and longjmp are called from the same function.
+   Since a frame pointer will be required in such a function, it is OK
+   that the stack pointer is not restored.  */
+
+#undef FRAME_POINTER_REQUIRED
+#define FRAME_POINTER_REQUIRED \
+  (current_function_calls_setjmp || current_function_calls_longjmp)
+
+/* Define a few machine-specific details
+   of the implementation of constructors.
+
+   CTORS_SECTION_ASM_OP should be defined to concatenate
+   the macro INIT_SECTION_ASM_OP, a newline, and a push instruction
+   to push a word containing 0 (or some equivalent of that).
+
+   ASM_OUTPUT_CONSTRUCTOR should be defined
+   to push the address of the constructor.  */
+
+#undef INIT_SECTION_ASM_OP
+#define INIT_SECTION_ASM_OP     ".section .init,\"x\""
+
+#define CTORS_SECTION_ASM_OP \
+  INIT_SECTION_ASM_OP "\n"	\
+  "\tpushl $0\n\t"		\
+  DATA_SECTION_ASM_OP
+/* The reason we end with DATA_SECTION_ASM_OP is to prevent the
+   initial and final table elements (see crtstuff.c) from getting into
+   the .init section and causing a crash.  */
+
+#define ASM_OUTPUT_CONSTRUCTOR(FILE,NAME)	\
+  do {						\
+    init_section ();				\
+    fprintf (FILE, "\tpushl $");		\
+    assemble_name (FILE, NAME);			\
+    fprintf (FILE, "\n");			\
+  } while (0)