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1.1 root 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.
4:
5: This file is part of GNU CC.
6:
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)
10: any later version.
11:
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.
16:
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. */
20:
21: #include "m68k.h"
22:
23: /* Without STRUCTURE_SIZE_BOUNDARY, we can't ensure that structures are
24: aligned such that we can correctly extract bitfields from them.
25: Someone should check whether the usual compiler on this machine
26: provides the equivalent behavior of STRUCTURE_SIZE_BOUNDARY. */
27: /* Alternative solutions are (1) define PCC_BITFIELD_TYPE_MATTERS,
28: if that fits what the usual compiler does,
29: or disable the -m68000 and -mnobitfield options. */
30: #error This doesn't define STRUCTURE_SIZE_BOUNDARY
31:
32: /* See m68k.h. 7 means 68020 with 68881. */
33:
34: #ifndef TARGET_DEFAULT
35: #define TARGET_DEFAULT 7
36: #endif
37:
38: #if TARGET_DEFAULT & 2
39: /* Define __HAVE_68881__ in preprocessor, unless -msoft-float is specified.
40: This will control the use of inline 68881 insns in certain macros. */
41:
42: #define CPP_SPEC "%{!msoft-float:-D__HAVE_68881__}"
43:
44: /* If the 68881 is used, link must load libmc.a instead of libc.a */
45:
46: #define LIB_SPEC "%{g:-lg} %{msoft-float:%{!p:%{!pg:-lc}}%{p:-lc_p}%{pg:-lc_p}}%{!msoft-float:%{!p:%{!pg:-lmc}}%{p:-lmc_p}%{pg:-lmc_p}} %{g:-lg}"
47:
48: #else
49: /* Define __HAVE_68881__ in preprocessor if -m68881 is specified.
50: This will control the use of inline 68881 insns in certain macros. */
51:
52: #define CPP_SPEC "%{m68881:-D__HAVE_68881__}"
53:
54: /* If the 68881 is used, link must load libmc.a instead of libc.a */
55:
56: #define LIB_SPEC "%{g:-lg} %{!m68881:%{!p:%{!pg:-lc}}%{p:-lc_p}%{pg:-lc_p}}%{m68881:%{!p:%{!pg:-lmc}}%{p:-lmc_p}%{pg:-lmc_p}}"
57: #endif
58:
59: /* Names to predefine in the preprocessor for this target machine. */
60:
61: #define CPP_PREDEFINES "-Dunix -Dmc68000 -Dis68k"
62:
63: /* This is BSD, so it wants DBX format. */
64:
65: #define DBX_DEBUGGING_INFO
66:
67: /* Override parts of m68k.h to fit the ISI 68k machine. */
68:
69: #undef FUNCTION_VALUE
70: #undef LIBCALL_VALUE
71: #undef FUNCTION_VALUE_REGNO_P
72: #undef ASM_FILE_START
73:
74: /* If TARGET_68881, return SF and DF values in f0 instead of d0. */
75:
76: #define FUNCTION_VALUE(VALTYPE,FUNC) LIBCALL_VALUE (TYPE_MODE (VALTYPE))
77:
78: #define LIBCALL_VALUE(MODE) \
79: gen_rtx (REG, (MODE), ((TARGET_68881 && ((MODE) == SFmode || (MODE) == DFmode)) ? 16 : 0))
80:
81: /* 1 if N is a possible register number for a function value.
82: D0 may be used, and F0 as well if -m68881 is specified. */
83:
84: #define FUNCTION_VALUE_REGNO_P(N) \
85: ((N) == 0 || (TARGET_68881 && (N) == 16))
86:
87: /* Also output something to cause the correct _doprnt to be loaded. */
88: #define ASM_FILE_START(FILE) fprintf (FILE, "#NO_APP\n%s\n", TARGET_68881 ? ".globl fltused" : "")
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