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1.1 root 1: /* Definitions of target machine for GNU compiler. Apollo 680X0 version.
2: Copyright (C) 1989 Free Software Foundation, Inc.
3:
4: This file is part of GNU CC.
5:
6: GNU CC is free software; you can redistribute it and/or modify
7: it under the terms of the GNU General Public License as published by
8: the Free Software Foundation; either version 1, or (at your option)
9: any later version.
10:
11: GNU CC is distributed in the hope that it will be useful,
12: but WITHOUT ANY WARRANTY; without even the implied warranty of
13: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14: GNU General Public License for more details.
15:
16: You should have received a copy of the GNU General Public License
17: along with GNU CC; see the file COPYING. If not, write to
18: the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
19:
20: #include "tm-m68k.h"
21:
22: /* This symbol may be tested in other files for special Apollo handling */
23:
24: #define TM_APOLLO
25:
26: /* See tm-m68k.h. 7 means 68020 with 68881. */
27:
28: #ifndef TARGET_DEFAULT
29: #define TARGET_DEFAULT 7
30: #endif
31:
32: /* Target switches for the Apollo is the same as in tm-m68k.h, except
33: there is no Sun FPA. */
34:
35: #undef TARGET_SWITCHES
36: #define TARGET_SWITCHES \
37: { { "68020", 5}, \
38: { "c68020", 5}, \
39: { "68881", 2}, \
40: { "bitfield", 4}, \
41: { "68000", -5}, \
42: { "c68000", -5}, \
43: { "soft-float", -0102}, \
44: { "nobitfield", -4}, \
45: { "rtd", 8}, \
46: { "nortd", -8}, \
47: { "short", 040}, \
48: { "noshort", -040}, \
49: { "", TARGET_DEFAULT}}
50:
51: /* Define __HAVE_68881__ in preprocessor,
52: according to the -m flags.
53: This will control the use of inline 68881 insns in certain macros.
54: Also inform the program which CPU this is for. */
55:
56: #if TARGET_DEFAULT & 02
57:
58: /* -m68881 is the default */
59: #define CPP_SPEC \
60: "%{!msoft-float:%{mfpa:-D__HAVE_FPA__ }%{!mfpa:-D__HAVE_68881__ }}\
61: %{!ansi:%{m68000:-Dmc68010}%{mc68000:-Dmc68010}%{!mc68000:%{!m68000:-Dmc68020}}}"
62:
63: #else
64:
65: /* -msoft-float is the default */
66: #define CPP_SPEC \
67: "%{m68881:-D__HAVE_68881__ }%{mfpa:-D__HAVE_FPA__ }\
68: %{!ansi:%{m68000:-Dmc68010}%{mc68000:-Dmc68010}%{!mc68000:%{!m68000:-Dmc68020}}}"
69:
70: #endif
71:
72: /* Names to predefine in the preprocessor for this target machine. */
73: /* These are the ones defined by Apollo, plus mc68000 for uniformity with
74: GCC on other 68000 systems. */
75:
76: #define CPP_PREDEFINES "-Dapollo -Daegis -Dunix"
77:
78: /* cpp has to support a #sccs directive for the /usr/include files */
79:
80: #define SCCS_DIRECTIVE
81:
82: /* Allow #ident but output nothing for it. */
83:
84: #define IDENT_DIRECTIVE
85: #define ASM_OUTPUT_IDENT(FILE, NAME)
86:
87: /* Allow dollarsigns in identifiers */
88:
89: #define DOLLARS_IN_IDENTIFIERS 1
90:
91: /* -m68000 requires special flags to the assembler.
92: The -C flag is passed to a modified GNU assembler to cause COFF
93: modules to be produced. Remove it if you're not using this. */
94:
95: #define ASM_SPEC \
96: "-C %{m68000:-mc68010}%{mc68000:-mc68010}%{!mc68000:%{!m68000:-mc68020}}"
97:
98: /* STARTFILE_SPEC
99: Note that includes knowledge of the default specs for gcc, ie. no
100: args translates to the same effect as -m68881 */
101:
102: #if TARGET_DEFAULT & 2
103: /* -m68881 is the default */
104: #define STARTFILE_SPEC \
105: "%{pg:gcrt0.o%s}%{!pg:%{p:mcrt0.o%s}%{!p:crt0.o%s}}"
106: #else
107: /* -msoft-float is the default */
108: #define STARTFILE_SPEC \
109: "%{pg:gcrt0.o%s}%{!pg:%{p:mcrt0.o%s}%{!p:crt0.o%s}}"
110: #endif
111:
112: /* Specify library to handle `-a' basic block profiling. */
113:
114: #define LIB_SPEC "%{!p:%{!pg:-lc}}%{p:-lc_p}%{pg:-lc_p} \
115: %{a:/usr/lib/bb_link.o} "
116:
117: /* Debugging is not supported yet */
118:
119: #undef DBX_DEBUGGING_INFO
120: #undef SDB_DEBUGGING_INFO
121:
122: /* Every structure or union's size must be a multiple of 2 bytes. */
123:
124: #define STRUCTURE_SIZE_BOUNDARY 16
125:
126: /* Functions which return large structures get the address
127: to place the wanted value at offset 8 from the frame. */
128:
129: #undef PCC_STATIC_STRUCT_RETURN
130: #undef STRUCT_VALUE_REGNUM
131:
132: /* Caller treats address of return area like a parm. */
133: #define STRUCT_VALUE 0
134:
135: #define STRUCT_VALUE_INCOMING \
136: gen_rtx (MEM, Pmode, \
137: gen_rtx (PLUS, SImode, frame_pointer_rtx, \
138: gen_rtx (CONST_INT, VOIDmode, 8)))
139:
140: /* Specify how to pad function arguments.
141: Arguments sizes < sizeof(int) are padded upward, and larger arguments
142: are not padded at all. */
143:
144: #define FUNCTION_ARG_PADDING(mode, size) \
145: (((mode) == BLKmode \
146: ? (GET_CODE (size) == CONST_INT \
147: && INTVAL (size) < PARM_BOUNDARY / BITS_PER_UNIT) \
148: : GET_MODE_BITSIZE (mode) < PARM_BOUNDARY) \
149: ? upward : none)
150:
151: /* Short integral argument prototype promotion is not done */
152:
153: #undef PROMOTE_PROTOTYPES
154:
155: /* The definition of this macro imposes a limit on the size of
156: an aggregate object which can be treated as if it were a scalar
157: object. */
158:
159: #define MAX_FIXED_MODE_SIZE BITS_PER_WORD
160:
161: /* The definition of this macro implies that there are cases where
162: a scalar value cannot be returned in registers.
163: For Apollo, anything larger than one integer register is returned
164: using the structure-value mechanism, i.e. objects of DFmode are
165: returned that way. */
166:
167: #define RETURN_IN_MEMORY(type) \
168: (GET_MODE_SIZE (TYPE_MODE (type)) > UNITS_PER_WORD)
169:
170: /* This is how to output a reference to a user-level label named NAME.
171: In order to link to Apollo libraries, no underscore is prepended to names.
172: `assemble_name' uses this. */
173:
174: #undef ASM_OUTPUT_LABELREF
175: #define ASM_OUTPUT_LABELREF(FILE,NAME) \
176: fprintf (FILE, "%s", NAME)
177:
178:
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