1 /* Definitions of target machine for GNU compiler. ISI 68000/68020 version.
2 Intended only for use with GAS, and not ISI's assembler, which is buggy
3 Copyright (C) 1988 Free Software Foundation, Inc.
5 This file is part of GNU CC.
7 GNU CC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2, or (at your option)
12 GNU CC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GNU CC; see the file COPYING. If not, write to
19 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
21 #include "m68k/m68k.h"
23 /* See m68k.h. 7 means 68020 with 68881. */
24 #ifndef TARGET_DEFAULT
25 #define TARGET_DEFAULT 7
28 #if TARGET_DEFAULT & 2
29 /* Define __HAVE_68881__ in preprocessor, unless -msoft-float is specified.
30 This will control the use of inline 68881 insns in certain macros. */
32 #define CPP_SPEC "%{!msoft-float:-D__HAVE_68881__}"
34 /* If the 68881 is used, link must load libmc.a instead of libc.a */
36 #define LIB_SPEC "%{msoft-float:%{!p:%{!pg:-lc}}%{p:-lc_p}%{pg:-lc_p}} \
37 %{!msoft-float:%{!p:%{!pg:-lmc}}%{p:-lmc_p}%{pg:-lmc_p}} \
41 /* Define __HAVE_68881__ in preprocessor if -m68881 is specified.
42 This will control the use of inline 68881 insns in certain macros. */
44 #define CPP_SPEC "%{m68881:-D__HAVE_68881__}"
46 /* If the 68881 is used, link must load libmc.a instead of libc.a */
48 #define LIB_SPEC "%{!m68881:%{!p:%{!pg:-lc}}%{p:-lc_p}%{pg:-lc_p}} \
49 %{m68881:%{!p:%{!pg:-lmc}}%{p:-lmc_p}%{pg:-lmc_p}} \
53 /* Names to predefine in the preprocessor for this target machine. */
55 #define CPP_PREDEFINES "-Dunix -Dmc68000 -Dis68k -Asystem(unix) -Asystem(bsd) -Acpu(m68k) -Amachine(m68k)"
57 /* This is BSD, so it wants DBX format. */
59 #define DBX_DEBUGGING_INFO
61 /* Override parts of m68k.h to fit the ISI 68k machine. */
65 #undef FUNCTION_VALUE_REGNO_P
66 #undef NEEDS_UNTYPED_CALL
69 /* Every structure or union's size must be a multiple of 2 bytes. */
71 #define STRUCTURE_SIZE_BOUNDARY 16
73 /* If TARGET_68881, return SF and DF values in f0 instead of d0. */
75 #define FUNCTION_VALUE(VALTYPE,FUNC) LIBCALL_VALUE (TYPE_MODE (VALTYPE))
77 #define LIBCALL_VALUE(MODE) \
78 gen_rtx (REG, (MODE), ((TARGET_68881 && ((MODE) == SFmode || (MODE) == DFmode)) ? 16 : 0))
80 /* 1 if N is a possible register number for a function value.
81 D0 may be used, and F0 as well if -m68881 is specified. */
83 #define FUNCTION_VALUE_REGNO_P(N) \
84 ((N) == 0 || (TARGET_68881 && (N) == 16))
86 /* Define this to be true when FUNCTION_VALUE_REGNO_P is true for
87 more than one register. */
89 #define NEEDS_UNTYPED_CALL 1
91 /* Also output something to cause the correct _doprnt to be loaded. */
92 #define ASM_FILE_START(FILE) fprintf (FILE, "#NO_APP\n%s\n", TARGET_68881 ? ".globl fltused" : "")