1992-01-21 22:07:13 -05:00
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/* Definitions for Intel 386 running system V.
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Copyright (C) 1988 Free Software Foundation, Inc.
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This file is part of GNU CC.
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GNU CC is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU CC is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU CC; see the file COPYING. If not, write to
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the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
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#include "i386.h"
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/* Use default settings for system V.3. */
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#include "svr3.h"
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/* Use the ATT assembler syntax.
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This overrides at least one macro (ASM_OUTPUT_LABELREF) from svr3.h. */
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#include "att386.h"
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/* By default, target has a 80387. */
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#define TARGET_DEFAULT 1
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/* Use crt1.o as a startup file and crtn.o as a closing file. */
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#define STARTFILE_SPEC \
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"%{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\
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%{p:-L/usr/lib/libp}%{pg:-L/usr/lib/libp}"
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1992-03-11 17:11:38 -05:00
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/* ??? There is a suggestion that -lg is needed here.
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Does anyone know whether this is right? */
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1992-01-21 22:07:13 -05:00
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#define LIB_SPEC "%{posix:-lcposix} %{shlib:-lc_s} -lc crtend.o%s crtn.o%s"
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/* Specify predefined symbols in preprocessor. */
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#define CPP_PREDEFINES "-Dunix -Di386"
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#define CPP_SPEC "%{posix:-D_POSIX_SOURCE}"
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/* Writing `int' for a bitfield forces int alignment for the structure. */
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#define PCC_BITFIELD_TYPE_MATTERS 1
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/* Don't write a `.optim' pseudo; this assembler doesn't handle them. */
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#undef ASM_FILE_START_1
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#define ASM_FILE_START_1(FILE)
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/* Machines that use the AT&T assembler syntax
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also return floating point values in an FP register. */
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/* Define how to find the value returned by a function.
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VALTYPE is the data type of the value (as a tree).
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If the precise function being called is known, FUNC is its FUNCTION_DECL;
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otherwise, FUNC is 0. */
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#define VALUE_REGNO(MODE) \
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(((MODE) == SFmode || (MODE) == DFmode) ? FIRST_FLOAT_REG : 0)
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/* 1 if N is a possible register number for a function value. */
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#define FUNCTION_VALUE_REGNO_P(N) ((N) == 0 || (N)== FIRST_FLOAT_REG)
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#if 0 /* This symbol is expected to exist only on BSD,
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and besides, it describes the host rather than the target.
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It certainly does not belong here. */
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#ifndef MAXPATHLEN
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#define MAXPATHLEN 1024
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#endif
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#endif
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/* longjmp may fail to restore the registers if called from the same
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function that called setjmp. To compensate, the compiler avoids
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putting variables in registers in functions that use both setjmp
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and longjmp. */
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#define NON_SAVING_SETJMP \
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(current_function_calls_setjmp && current_function_calls_longjmp)
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/* longjmp may fail to restore the stack pointer if the saved frame
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pointer is the same as the caller's frame pointer. Requiring a frame
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pointer in any function that calls setjmp or longjmp avoids this
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problem, unless setjmp and longjmp are called from the same function.
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Since a frame pointer will be required in such a function, it is OK
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that the stack pointer is not restored. */
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#undef FRAME_POINTER_REQUIRED
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#define FRAME_POINTER_REQUIRED \
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(current_function_calls_setjmp || current_function_calls_longjmp)
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1992-03-19 15:41:45 -05:00
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/* Define a few machine-specific details of the implementation of
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constructors.
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1992-01-21 22:07:13 -05:00
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1992-03-19 15:41:45 -05:00
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The __CTORS_LIST__ goes in the .init section. Define CTOR_LIST_BEGIN
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and CTOR_LIST_END to contribute to the .init section an instruction to
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push a word containing 0 (or some equivalent of that).
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1992-01-21 22:07:13 -05:00
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1992-03-19 15:41:45 -05:00
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ASM_OUTPUT_CONSTRUCTOR should be defined to push the address of the
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constructor. */
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1992-01-21 22:07:13 -05:00
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#undef INIT_SECTION_ASM_OP
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#define INIT_SECTION_ASM_OP ".section .init,\"x\""
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1992-03-19 15:41:45 -05:00
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#define CTOR_LIST_BEGIN \
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asm (INIT_SECTION_ASM_OP); \
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asm ("pushl $0")
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#define CTOR_LIST_END CTOR_LIST_BEGIN
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1992-01-21 22:07:13 -05:00
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#define ASM_OUTPUT_CONSTRUCTOR(FILE,NAME) \
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do { \
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init_section (); \
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fprintf (FILE, "\tpushl $"); \
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assemble_name (FILE, NAME); \
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fprintf (FILE, "\n"); \
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} while (0)
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