1 /* Definitions for Motorola 68k running Linux-based GNU systems with
2 ELF format.
3 Copyright (C) 1995-2023 Free Software Foundation, Inc.
4
5 This file is part of GCC.
6
7 GCC 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 3, or (at your option)
10 any later version.
11
12 GCC 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 GCC; see the file COPYING3. If not see
19 <http://www.gnu.org/licenses/>. */
20
21 /* Add %(asm_cpu_spec) to a generic definition of ASM_SPEC. */
22 #undef ASM_SPEC
23 #define ASM_SPEC "%(asm_cpu_spec) %(asm_pcrel_spec)"
24
25 #undef PREFERRED_STACK_BOUNDARY
26 #define PREFERRED_STACK_BOUNDARY 32
27
28 /* for 68k machines this only needs to be TRUE for the 68000 */
29
30 #undef STRICT_ALIGNMENT
31 #define STRICT_ALIGNMENT 0
32 #undef M68K_HONOR_TARGET_STRICT_ALIGNMENT
33 #define M68K_HONOR_TARGET_STRICT_ALIGNMENT 0
34
35 /* Here are four prefixes that are used by asm_fprintf to
36 facilitate customization for alternate assembler syntaxes.
37 Machines with no likelihood of an alternate syntax need not
38 define these and need not use asm_fprintf. */
39
40 /* The prefix for register names. Note that REGISTER_NAMES
41 is supposed to include this prefix. Also note that this is NOT an
42 fprintf format string, it is a literal string */
43
44 #undef REGISTER_PREFIX
45 #define REGISTER_PREFIX "%"
46
47 /* The prefix for local (compiler generated) labels.
48 These labels will not appear in the symbol table. */
49
50 #undef LOCAL_LABEL_PREFIX
51 #define LOCAL_LABEL_PREFIX "."
52
53 /* The prefix to add to user-visible assembler symbols. */
54
55 #undef USER_LABEL_PREFIX
56 #define USER_LABEL_PREFIX ""
57
58 #define ASM_COMMENT_START "|"
59
60 /* Target OS builtins. */
61 #define TARGET_OS_CPP_BUILTINS() GNU_USER_TARGET_OS_CPP_BUILTINS()
62
63 #undef CPP_SPEC
64 #define CPP_SPEC "%{posix:-D_POSIX_SOURCE} %{pthread:-D_REENTRANT}"
65
66 /* Provide a LINK_SPEC appropriate for GNU/Linux. Here we provide support
67 for the special GCC options -static and -shared, which allow us to
68 link things in one of these three modes by applying the appropriate
69 combinations of options at link-time.
70
71 When the -shared link option is used a final link is not being
72 done. */
73
74 #define GLIBC_DYNAMIC_LINKER "/lib/ld.so.1"
75
76 #undef MUSL_DYNAMIC_LINKER
77 #define MUSL_DYNAMIC_LINKER "/lib/ld-musl-m68k.so.1"
78
79 #undef LINK_SPEC
80 #define LINK_SPEC "-m m68kelf %{shared} \
81 %{!shared: \
82 %{!static: \
83 %{rdynamic:-export-dynamic} \
84 -dynamic-linker " GNU_USER_DYNAMIC_LINKER "} \
85 %{static}}"
86
87 /* For compatibility with linux/a.out */
88
89 #undef PCC_BITFIELD_TYPE_MATTERS
90
91 /* Currently, JUMP_TABLES_IN_TEXT_SECTION must be defined in order to
92 keep switch tables in the text section. */
93
94 #define JUMP_TABLES_IN_TEXT_SECTION 1
95
96 /* Use the default action for outputting the case label. */
97 #undef ASM_OUTPUT_CASE_LABEL
98 #define ASM_RETURN_CASE_JUMP \
99 do { \
100 if (TARGET_COLDFIRE) \
101 { \
102 if (ADDRESS_REG_P (operands[0])) \
103 return "jmp %%pc@(2,%0:l)"; \
104 else if (TARGET_LONG_JUMP_TABLE_OFFSETS) \
105 return "jmp %%pc@(2,%0:l)"; \
106 else \
107 return "ext%.l %0\n\tjmp %%pc@(2,%0:l)"; \
108 } \
109 else if (TARGET_LONG_JUMP_TABLE_OFFSETS) \
110 return "jmp %%pc@(2,%0:l)"; \
111 else \
112 return "jmp %%pc@(2,%0:w)"; \
113 } while (0)
114
115 /* This is how to output an assembler line that says to advance the
116 location counter to a multiple of 2**LOG bytes. */
117
118 #undef ASM_OUTPUT_ALIGN
119 #define ASM_OUTPUT_ALIGN(FILE,LOG) \
120 if ((LOG) > 0) \
121 fprintf ((FILE), "%s%u\n", ALIGN_ASM_OP, 1 << (LOG));
122
123 /* If defined, a C expression whose value is a string containing the
124 assembler operation to identify the following data as uninitialized global
125 data. */
126
127 #define BSS_SECTION_ASM_OP "\t.section\t.bss"
128
129 /* A C statement (sans semicolon) to output to the stdio stream
130 FILE the assembler definition of uninitialized global DECL named
131 NAME whose size is SIZE bytes and alignment is ALIGN bytes.
132 Try to use asm_output_aligned_bss to implement this macro. */
133
134 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
135 asm_output_aligned_bss (FILE, DECL, NAME, SIZE, ALIGN)
136
137 /* Output assembler code to FILE to increment profiler label # LABELNO
138 for profiling a function entry. */
139 #define NO_PROFILE_COUNTERS 1
140 #undef FUNCTION_PROFILER
141 #define FUNCTION_PROFILER(FILE, LABELNO) \
142 { \
143 if (flag_pic) \
144 fprintf (FILE, "\tbsr.l _mcount@PLTPC\n"); \
145 else \
146 fprintf (FILE, "\tjbsr _mcount\n"); \
147 }
148
149 /* 1 if N is a possible register number for a function value. For
150 m68k/SVR4 allow d0, a0, or fp0 as return registers, for integral,
151 pointer, or floating types, respectively. Reject fp0 if not using
152 a 68881 coprocessor. */
153
154 #undef FUNCTION_VALUE_REGNO_P
155 #define FUNCTION_VALUE_REGNO_P(N) \
156 ((N) == D0_REG || (N) == A0_REG || (TARGET_68881 && (N) == FP0_REG))
157
158 /* Define this to be true when FUNCTION_VALUE_REGNO_P is true for
159 more than one register. */
160
161 #undef NEEDS_UNTYPED_CALL
162 #define NEEDS_UNTYPED_CALL 1
163
164 /* Define how to generate (in the callee) the output value of a
165 function and how to find (in the caller) the value returned by a
166 function. VALTYPE is the data type of the value (as a tree). If
167 the precise function being called is known, FUNC is its
168 FUNCTION_DECL; otherwise, FUNC is 0. For m68k/SVR4 generate the
169 result in d0, a0, or fp0 as appropriate. */
170
171 #undef FUNCTION_VALUE
172 #define FUNCTION_VALUE(VALTYPE, FUNC) \
173 m68k_function_value (VALTYPE, FUNC)
174
175 /* Define how to find the value returned by a library function
176 assuming the value has mode MODE.
177 For m68k/SVR4 look for integer values in d0, pointer values in d0
178 (returned in both d0 and a0), and floating values in fp0. */
179
180 #undef LIBCALL_VALUE
181 #define LIBCALL_VALUE(MODE) \
182 m68k_libcall_value (MODE)
183
184 /* For m68k SVR4, structures are returned using the reentrant
185 technique. */
186 #undef PCC_STATIC_STRUCT_RETURN
187 #define DEFAULT_PCC_STRUCT_RETURN 0
188
189 /* Finalize the trampoline by flushing the insn cache. */
190
191 #undef FINALIZE_TRAMPOLINE
192 #define FINALIZE_TRAMPOLINE(TRAMP) \
193 maybe_emit_call_builtin___clear_cache ((TRAMP), \
194 plus_constant (Pmode, \
195 (TRAMP), \
196 TRAMPOLINE_SIZE))
197
198 /* Clear the instruction cache from `beg' to `end'. This makes an
199 inline system call to SYS_cacheflush. The arguments are as
200 follows:
201
202 cacheflush (addr, scope, cache, len)
203
204 addr - the start address for the flush
205 scope - the scope of the flush (see the cpush insn)
206 cache - which cache to flush (see the cpush insn)
207 len - a factor relating to the number of flushes to perform:
208 len/16 lines, or len/4096 pages. */
209
210 #define CLEAR_INSN_CACHE(BEG, END) \
211 { \
212 register unsigned long _beg __asm ("%d1") = (unsigned long) (BEG); \
213 unsigned long _end = (unsigned long) (END); \
214 register unsigned long _len __asm ("%d4") = (_end - _beg + 32); \
215 __asm __volatile \
216 ("move%.l #123, %/d0\n\t" /* system call nr */ \
217 "move%.l #1, %/d2\n\t" /* clear lines */ \
218 "move%.l #3, %/d3\n\t" /* insn+data caches */ \
219 "trap #0" \
220 : /* no outputs */ \
221 : "d" (_beg), "d" (_len) \
222 : "%d0", "%d2", "%d3"); \
223 }
224
225 #define TARGET_ASM_FILE_END file_end_indicate_exec_stack
226
227 #undef DEBUGGER_REGNO
228 #define DEBUGGER_REGNO(REGNO) (REGNO)
229
230 #undef SIZE_TYPE
231 #define SIZE_TYPE "unsigned int"
232
233 #undef PTRDIFF_TYPE
234 #define PTRDIFF_TYPE "int"
235
236 #undef WCHAR_TYPE
237 #define WCHAR_TYPE "long int"
238
239 #undef WCHAR_TYPE_SIZE
240 #define WCHAR_TYPE_SIZE BITS_PER_WORD
241
242 /* Install the __sync libcalls. */
243 #undef TARGET_INIT_LIBFUNCS
244 #define TARGET_INIT_LIBFUNCS m68k_init_sync_libfuncs