1 /* Definitions of target machine for GNU compiler,
2 for m68k (including m68010) NetBSD platforms using the
3 ELF object format.
4 Copyright (C) 2002-2023 Free Software Foundation, Inc.
5 Contributed by Wasabi Systems. Inc.
6
7 This file is derived from <m68k/m68kv4.h>, <m68k/m68kelf.h>,
8 and <m68k/linux.h>.
9
10 This file is part of GCC.
11
12 GCC is free software; you can redistribute it and/or modify
13 it under the terms of the GNU General Public License as published by
14 the Free Software Foundation; either version 3, or (at your option)
15 any later version.
16
17 GCC is distributed in the hope that it will be useful,
18 but WITHOUT ANY WARRANTY; without even the implied warranty of
19 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 GNU General Public License for more details.
21
22 You should have received a copy of the GNU General Public License
23 along with GCC; see the file COPYING3. If not see
24 <http://www.gnu.org/licenses/>. */
25
26 #define TARGET_OS_CPP_BUILTINS() \
27 do \
28 { \
29 NETBSD_OS_CPP_BUILTINS_ELF(); \
30 builtin_define ("__m68k__"); \
31 builtin_define ("__SVR4_ABI__"); \
32 builtin_define ("__motorola__"); \
33 if (TARGET_HARD_FLOAT) \
34 builtin_define ("__HAVE_FPU__"); \
35 } \
36 while (0)
37
38 /* Don't try using XFmode on the 68010. */
39 #undef LONG_DOUBLE_TYPE_SIZE
40 #define LONG_DOUBLE_TYPE_SIZE (TARGET_68020 ? 80 : 64)
41
42 #undef SUBTARGET_EXTRA_SPECS
43 #define SUBTARGET_EXTRA_SPECS \
44 { "netbsd_entry_point", NETBSD_ENTRY_POINT },
45
46
47 /* Provide a CPP_SPEC appropriate for NetBSD m68k targets. Currently we
48 deal with the GCC option '-posix', as well as an indication as to
49 whether or not use of the FPU is allowed. */
50
51 #undef CPP_SPEC
52 #define CPP_SPEC NETBSD_CPP_SPEC
53
54
55 /* Provide an ASM_SPEC appropriate for NetBSD m68k ELF targets. We need
56 to pass PIC code generation options. */
57
58 #undef ASM_SPEC
59 #define ASM_SPEC \
60 "%(asm_cpu_spec) %{" FPIE1_OR_FPIC1_SPEC ":-k} %{" FPIE2_OR_FPIC2_SPEC ":-k -K}"
61
62 /* Provide a LINK_SPEC appropriate for a NetBSD/m68k ELF target. */
63
64 #undef LINK_SPEC
65 #define LINK_SPEC NETBSD_LINK_SPEC_ELF
66
67 #define NETBSD_ENTRY_POINT "_start"
68
69 /* Output assembler code to FILE to increment profiler label # LABELNO
70 for profiling a function only. */
71
72 #undef FUNCTION_PROFILER
73 #define FUNCTION_PROFILER(FILE, LABELNO) \
74 do \
75 { \
76 asm_fprintf (FILE, "\tlea (%LLP%d,%Rpc),%Ra1\n", (LABELNO)); \
77 if (flag_pic) \
78 fprintf (FILE, "\tbsr.l __mcount@PLTPC\n"); \
79 else \
80 fprintf (FILE, "\tjbsr __mcount\n"); \
81 } \
82 while (0)
83
84
85 /* Make gcc agree with <machine/ansi.h> */
86
87 #undef SIZE_TYPE
88 #define SIZE_TYPE "unsigned int"
89
90 #undef PTRDIFF_TYPE
91 #define PTRDIFF_TYPE "int"
92
93
94 /* XXX
95 Here is a bunch of stuff lifted from m68kelf.h. We don't use that
96 file directly, because it has a lot of baggage we don't want. */
97
98
99 /* The prefix for register names. Note that REGISTER_NAMES
100 is supposed to include this prefix. Also note that this is NOT an
101 fprintf format string, it is a literal string. */
102
103 #undef REGISTER_PREFIX
104 #define REGISTER_PREFIX "%"
105
106
107 /* The prefix for local (compiler generated) lables.
108 These labels will not appear in the symbol table. */
109
110 #undef LOCAL_LABEL_PREFIX
111 #define LOCAL_LABEL_PREFIX "."
112
113
114 /* The prefix to add to user-visible assembler symbols. */
115
116 #undef USER_LABEL_PREFIX
117 #define USER_LABEL_PREFIX ""
118
119
120 #undef ASM_COMMENT_START
121 #define ASM_COMMENT_START "|"
122
123
124 /* Currently, JUMP_TABLES_IN_TEXT_SECTION must be defined in order to
125 keep switch tables in the text section. */
126
127 #undef JUMP_TABLES_IN_TEXT_SECTION
128 #define JUMP_TABLES_IN_TEXT_SECTION 1
129
130
131 /* Use the default action for outputting the case label. */
132 #undef ASM_OUTPUT_CASE_LABEL
133 #define ASM_RETURN_CASE_JUMP \
134 do { \
135 if (TARGET_COLDFIRE) \
136 { \
137 if (ADDRESS_REG_P (operands[0])) \
138 return "jmp %%pc@(2,%0:l)"; \
139 else if (TARGET_LONG_JUMP_TABLE_OFFSETS) \
140 return "jmp %%pc@(2,%0:l)"; \
141 else \
142 return "ext%.l %0\n\tjmp %%pc@(2,%0:l)"; \
143 } \
144 else if (TARGET_LONG_JUMP_TABLE_OFFSETS) \
145 return "jmp %%pc@(2,%0:l)"; \
146 else \
147 return "jmp %%pc@(2,%0:w)"; \
148 } while (0)
149
150
151 /* This is how to output an assembler line that says to advance the
152 location counter to a multiple of 2**LOG bytes. */
153
154 #undef ASM_OUTPUT_ALIGN
155 #define ASM_OUTPUT_ALIGN(FILE,LOG) \
156 do \
157 { \
158 if ((LOG) > 0) \
159 fprintf ((FILE), "%s%u\n", ALIGN_ASM_OP, 1 << (LOG)); \
160 } \
161 while (0)
162
163
164 /* If defined, a C expression whose value is a string containing the
165 assembler operation to identify the following data as uninitialized global
166 data. */
167
168 #define BSS_SECTION_ASM_OP ".section\t.bss"
169
170
171 #undef ASM_OUTPUT_ALIGNED_BSS
172 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
173 asm_output_aligned_bss (FILE, DECL, NAME, SIZE, ALIGN)
174
175
176 #undef ASM_OUTPUT_COMMON
177 #define ASM_OUTPUT_COMMON(FILE, NAME, SIZE, ROUNDED) \
178 ( fputs (".comm ", (FILE)), \
179 assemble_name ((FILE), (NAME)), \
180 fprintf ((FILE), ",%u\n", (int)(SIZE)))
181
182 #undef ASM_OUTPUT_LOCAL
183 #define ASM_OUTPUT_LOCAL(FILE, NAME, SIZE, ROUNDED) \
184 ( fputs (".lcomm ", (FILE)), \
185 assemble_name ((FILE), (NAME)), \
186 fprintf ((FILE), ",%u\n", (int)(SIZE)))
187
188
189 /* XXX
190 This is the end of the chunk lifted from m68kelf.h */
191
192
193 /* XXX
194 The following chunk is more or less lifted from m68kv4.h.
195 We'd like to just #include that file, but it has not yet
196 been converted to the new include style.
197
198 Should there be a m68kv4-abi.h ?? */
199
200
201 /* Register in which address to store a structure value is passed to a
202 function. The default in m68k.h is a1. For m68k/SVR4 it is a0. */
203
204 #undef M68K_STRUCT_VALUE_REGNUM
205 #define M68K_STRUCT_VALUE_REGNUM A0_REG
206
207
208 /* Register in which static-chain is passed to a function. The
209 default isn m68k.h is a0, but that is already the struct value
210 regnum. Make it a1 instead. */
211
212 #undef STATIC_CHAIN_REGNUM
213 #define STATIC_CHAIN_REGNUM A1_REG
214 #undef M68K_STATIC_CHAIN_REG_NAME
215 #define M68K_STATIC_CHAIN_REG_NAME REGISTER_PREFIX "a1"
216
217
218 /* Now to renumber registers for gdb.
219 We use the Sun-3 convention, which is:
220 floating point registers have numbers 18 to 25, not
221 16 to 23 as they do in the compiler. */
222
223 #undef DEBUGGER_REGNO
224 #define DEBUGGER_REGNO(REGNO) ((REGNO) < 16 ? (REGNO) : (REGNO) + 2)
225
226
227 /* 1 if N is a possible register number for a function value. For
228 m68k/SVR4 allow d0, a0, or fp0 as return registers, for integral,
229 pointer, or floating types, respectively. Reject fp0 if not using
230 a 68881 coprocessor. */
231
232 #undef FUNCTION_VALUE_REGNO_P
233 #define FUNCTION_VALUE_REGNO_P(N) \
234 ((N) == D0_REG || (N) == A0_REG || (TARGET_68881 && (N) == FP0_REG))
235
236
237 /* Define this to be true when FUNCTION_VALUE_REGNO_P is true for
238 more than one register. */
239
240 #undef NEEDS_UNTYPED_CALL
241 #define NEEDS_UNTYPED_CALL 1
242
243
244 /* Define how to generate (in the callee) the output value of a
245 function and how to find (in the caller) the value returned by a
246 function. VALTYPE is the data type of the value (as a tree). If
247 the precise function being called is known, FUNC is its
248 FUNCTION_DECL; otherwise, FUNC is 0. For m68k/SVR4 generate the
249 result in d0, a0, or fp0 as appropriate. */
250
251 #undef FUNCTION_VALUE
252 #define FUNCTION_VALUE(VALTYPE, FUNC) \
253 m68k_function_value (VALTYPE, FUNC)
254
255
256 /* Define how to find the value returned by a library function
257 assuming the value has mode MODE.
258 For m68k/SVR4 look for integer values in d0, pointer values in d0
259 (returned in both d0 and a0), and floating values in fp0. */
260
261 #undef LIBCALL_VALUE
262 #define LIBCALL_VALUE(MODE) \
263 m68k_libcall_value (MODE)
264
265
266 /* Boundary (in *bits*) on which stack pointer should be aligned.
267 The m68k/SVR4 convention is to keep the stack pointer longword aligned. */
268
269 #undef STACK_BOUNDARY
270 #define STACK_BOUNDARY 32
271
272
273 /* Alignment of field after `int : 0' in a structure.
274 For m68k/SVR4, this is the next longword boundary. */
275
276 #undef EMPTY_FIELD_BOUNDARY
277 #define EMPTY_FIELD_BOUNDARY 32
278
279
280 /* No data type wants to be aligned rounder than this.
281 For m68k/SVR4, some types (doubles for example) are aligned on 8 byte
282 boundaries */
283
284 #undef BIGGEST_ALIGNMENT
285 #define BIGGEST_ALIGNMENT 64
286
287
288 /* The svr4 ABI for the m68k says that records and unions are returned
289 in memory. */
290
291 #undef DEFAULT_PCC_STRUCT_RETURN
292 #define DEFAULT_PCC_STRUCT_RETURN 1
293
294 /* XXX
295 This is the end of the chunk lifted from m68kv4.h */