1 /* Definitions for Motorola 68k running Linux-based GNU systems with
3 Copyright (C) 1995-2022 Free Software Foundation, Inc.
5 This file is part of GCC.
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)
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.
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/>. */
21 /* Add %(asm_cpu_spec) to a generic definition of ASM_SPEC. */
23 #define ASM_SPEC "%(asm_cpu_spec) %(asm_pcrel_spec)"
25 #undef PREFERRED_STACK_BOUNDARY
26 #define PREFERRED_STACK_BOUNDARY 32
28 /* for 68k machines this only needs to be TRUE for the 68000 */
30 #undef STRICT_ALIGNMENT
31 #define STRICT_ALIGNMENT 0
32 #undef M68K_HONOR_TARGET_STRICT_ALIGNMENT
33 #define M68K_HONOR_TARGET_STRICT_ALIGNMENT 0
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. */
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 */
44 #undef REGISTER_PREFIX
45 #define REGISTER_PREFIX "%"
47 /* The prefix for local (compiler generated) labels.
48 These labels will not appear in the symbol table. */
50 #undef LOCAL_LABEL_PREFIX
51 #define LOCAL_LABEL_PREFIX "."
53 /* The prefix to add to user-visible assembler symbols. */
55 #undef USER_LABEL_PREFIX
56 #define USER_LABEL_PREFIX ""
58 #define ASM_COMMENT_START "|"
60 /* Target OS builtins. */
61 #define TARGET_OS_CPP_BUILTINS() GNU_USER_TARGET_OS_CPP_BUILTINS()
64 #define CPP_SPEC "%{posix:-D_POSIX_SOURCE} %{pthread:-D_REENTRANT}"
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.
71 When the -shared link option is used a final link is not being
74 #define GLIBC_DYNAMIC_LINKER "/lib/ld.so.1"
76 #undef MUSL_DYNAMIC_LINKER
77 #define MUSL_DYNAMIC_LINKER "/lib/ld-musl-m68k.so.1"
80 #define LINK_SPEC "-m m68kelf %{shared} \
83 %{rdynamic:-export-dynamic} \
84 -dynamic-linker " GNU_USER_DYNAMIC_LINKER "} \
87 /* For compatibility with linux/a.out */
89 #undef PCC_BITFIELD_TYPE_MATTERS
91 /* Currently, JUMP_TABLES_IN_TEXT_SECTION must be defined in order to
92 keep switch tables in the text section. */
94 #define JUMP_TABLES_IN_TEXT_SECTION 1
96 /* Use the default action for outputting the case label. */
97 #undef ASM_OUTPUT_CASE_LABEL
98 #define ASM_RETURN_CASE_JUMP \
100 if (TARGET_COLDFIRE) \
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)"; \
107 return "ext%.l %0\n\tjmp %%pc@(2,%0:l)"; \
109 else if (TARGET_LONG_JUMP_TABLE_OFFSETS) \
110 return "jmp %%pc@(2,%0:l)"; \
112 return "jmp %%pc@(2,%0:w)"; \
115 /* This is how to output an assembler line that says to advance the
116 location counter to a multiple of 2**LOG bytes. */
118 #undef ASM_OUTPUT_ALIGN
119 #define ASM_OUTPUT_ALIGN(FILE,LOG) \
121 fprintf ((FILE), "%s%u\n", ALIGN_ASM_OP, 1 << (LOG));
123 /* If defined, a C expression whose value is a string containing the
124 assembler operation to identify the following data as uninitialized global
127 #define BSS_SECTION_ASM_OP "\t.section\t.bss"
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. */
134 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
135 asm_output_aligned_bss (FILE, DECL, NAME, SIZE, ALIGN)
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) \
144 fprintf (FILE, "\tbsr.l _mcount@PLTPC\n"); \
146 fprintf (FILE, "\tjbsr _mcount\n"); \
149 /* Do not break .stabs pseudos into continuations. */
151 #define DBX_CONTIN_LENGTH 0
153 /* 1 if N is a possible register number for a function value. For
154 m68k/SVR4 allow d0, a0, or fp0 as return registers, for integral,
155 pointer, or floating types, respectively. Reject fp0 if not using
156 a 68881 coprocessor. */
158 #undef FUNCTION_VALUE_REGNO_P
159 #define FUNCTION_VALUE_REGNO_P(N) \
160 ((N) == D0_REG || (N) == A0_REG || (TARGET_68881 && (N) == FP0_REG))
162 /* Define this to be true when FUNCTION_VALUE_REGNO_P is true for
163 more than one register. */
165 #undef NEEDS_UNTYPED_CALL
166 #define NEEDS_UNTYPED_CALL 1
168 /* Define how to generate (in the callee) the output value of a
169 function and how to find (in the caller) the value returned by a
170 function. VALTYPE is the data type of the value (as a tree). If
171 the precise function being called is known, FUNC is its
172 FUNCTION_DECL; otherwise, FUNC is 0. For m68k/SVR4 generate the
173 result in d0, a0, or fp0 as appropriate. */
175 #undef FUNCTION_VALUE
176 #define FUNCTION_VALUE(VALTYPE, FUNC) \
177 m68k_function_value (VALTYPE, FUNC)
179 /* Define how to find the value returned by a library function
180 assuming the value has mode MODE.
181 For m68k/SVR4 look for integer values in d0, pointer values in d0
182 (returned in both d0 and a0), and floating values in fp0. */
185 #define LIBCALL_VALUE(MODE) \
186 m68k_libcall_value (MODE)
188 /* For m68k SVR4, structures are returned using the reentrant
190 #undef PCC_STATIC_STRUCT_RETURN
191 #define DEFAULT_PCC_STRUCT_RETURN 0
193 /* Finalize the trampoline by flushing the insn cache. */
195 #undef FINALIZE_TRAMPOLINE
196 #define FINALIZE_TRAMPOLINE(TRAMP) \
197 maybe_emit_call_builtin___clear_cache ((TRAMP), \
198 plus_constant (Pmode, \
202 /* Clear the instruction cache from `beg' to `end'. This makes an
203 inline system call to SYS_cacheflush. The arguments are as
206 cacheflush (addr, scope, cache, len)
208 addr - the start address for the flush
209 scope - the scope of the flush (see the cpush insn)
210 cache - which cache to flush (see the cpush insn)
211 len - a factor relating to the number of flushes to perform:
212 len/16 lines, or len/4096 pages. */
214 #define CLEAR_INSN_CACHE(BEG, END) \
216 register unsigned long _beg __asm ("%d1") = (unsigned long) (BEG); \
217 unsigned long _end = (unsigned long) (END); \
218 register unsigned long _len __asm ("%d4") = (_end - _beg + 32); \
220 ("move%.l #123, %/d0\n\t" /* system call nr */ \
221 "move%.l #1, %/d2\n\t" /* clear lines */ \
222 "move%.l #3, %/d3\n\t" /* insn+data caches */ \
225 : "d" (_beg), "d" (_len) \
226 : "%d0", "%d2", "%d3"); \
229 #define TARGET_ASM_FILE_END file_end_indicate_exec_stack
231 #undef DBX_REGISTER_NUMBER
232 #define DBX_REGISTER_NUMBER(REGNO) (REGNO)
235 #define SIZE_TYPE "unsigned int"
238 #define PTRDIFF_TYPE "int"
241 #define WCHAR_TYPE "long int"
243 #undef WCHAR_TYPE_SIZE
244 #define WCHAR_TYPE_SIZE BITS_PER_WORD
246 /* Install the __sync libcalls. */
247 #undef TARGET_INIT_LIBFUNCS
248 #define TARGET_INIT_LIBFUNCS m68k_init_sync_libfuncs