1 /* Definitions for Motorola 68k running Linux-based GNU systems with 2 ELF format. 3 Copyright (C) 1995-2022 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 /* Do not break .stabs pseudos into continuations. */ 150 151 #define DBX_CONTIN_LENGTH 0 152 153 /* 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. */ 157 158 #undef FUNCTION_VALUE_REGNO_P 159 #define FUNCTION_VALUE_REGNO_P(N) \ 160 ((N) == D0_REG || (N) == A0_REG || (TARGET_68881 && (N) == FP0_REG)) 161 162 /* Define this to be true when FUNCTION_VALUE_REGNO_P is true for 163 more than one register. */ 164 165 #undef NEEDS_UNTYPED_CALL 166 #define NEEDS_UNTYPED_CALL 1 167 168 /* 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. */ 174 175 #undef FUNCTION_VALUE 176 #define FUNCTION_VALUE(VALTYPE, FUNC) \ 177 m68k_function_value (VALTYPE, FUNC) 178 179 /* 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. */ 183 184 #undef LIBCALL_VALUE 185 #define LIBCALL_VALUE(MODE) \ 186 m68k_libcall_value (MODE) 187 188 /* For m68k SVR4, structures are returned using the reentrant 189 technique. */ 190 #undef PCC_STATIC_STRUCT_RETURN 191 #define DEFAULT_PCC_STRUCT_RETURN 0 192 193 /* Finalize the trampoline by flushing the insn cache. */ 194 195 #undef FINALIZE_TRAMPOLINE 196 #define FINALIZE_TRAMPOLINE(TRAMP) \ 197 maybe_emit_call_builtin___clear_cache ((TRAMP), \ 198 plus_constant (Pmode, \ 199 (TRAMP), \ 200 TRAMPOLINE_SIZE)) 201 202 /* Clear the instruction cache from `beg' to `end'. This makes an 203 inline system call to SYS_cacheflush. The arguments are as 204 follows: 205 206 cacheflush (addr, scope, cache, len) 207 208 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. */ 213 214 #define CLEAR_INSN_CACHE(BEG, END) \ 215 { \ 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); \ 219 __asm __volatile \ 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 */ \ 223 "trap #0" \ 224 : /* no outputs */ \ 225 : "d" (_beg), "d" (_len) \ 226 : "%d0", "%d2", "%d3"); \ 227 } 228 229 #define TARGET_ASM_FILE_END file_end_indicate_exec_stack 230 231 #undef DBX_REGISTER_NUMBER 232 #define DBX_REGISTER_NUMBER(REGNO) (REGNO) 233 234 #undef SIZE_TYPE 235 #define SIZE_TYPE "unsigned int" 236 237 #undef PTRDIFF_TYPE 238 #define PTRDIFF_TYPE "int" 239 240 #undef WCHAR_TYPE 241 #define WCHAR_TYPE "long int" 242 243 #undef WCHAR_TYPE_SIZE 244 #define WCHAR_TYPE_SIZE BITS_PER_WORD 245 246 /* Install the __sync libcalls. */ 247 #undef TARGET_INIT_LIBFUNCS 248 #define TARGET_INIT_LIBFUNCS m68k_init_sync_libfuncs 249
Indexes created Tue Mar 03 05:31:39 UTC 2026