1 /* Definitions for Motorola 68k running Linux-based GNU systems with 2 ELF format. 3 Copyright (C) 1995-2019 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 LINK_SPEC 77 #define LINK_SPEC "-m m68kelf %{shared} \ 78 %{!shared: \ 79 %{!static: \ 80 %{rdynamic:-export-dynamic} \ 81 -dynamic-linker " GNU_USER_DYNAMIC_LINKER "} \ 82 %{static}}" 83 84 /* For compatibility with linux/a.out */ 85 86 #undef PCC_BITFIELD_TYPE_MATTERS 87 88 /* Currently, JUMP_TABLES_IN_TEXT_SECTION must be defined in order to 89 keep switch tables in the text section. */ 90 91 #define JUMP_TABLES_IN_TEXT_SECTION 1 92 93 /* Use the default action for outputting the case label. */ 94 #undef ASM_OUTPUT_CASE_LABEL 95 #define ASM_RETURN_CASE_JUMP \ 96 do { \ 97 if (TARGET_COLDFIRE) \ 98 { \ 99 if (ADDRESS_REG_P (operands[0])) \ 100 return "jmp %%pc@(2,%0:l)"; \ 101 else if (TARGET_LONG_JUMP_TABLE_OFFSETS) \ 102 return "jmp %%pc@(2,%0:l)"; \ 103 else \ 104 return "ext%.l %0\n\tjmp %%pc@(2,%0:l)"; \ 105 } \ 106 else if (TARGET_LONG_JUMP_TABLE_OFFSETS) \ 107 return "jmp %%pc@(2,%0:l)"; \ 108 else \ 109 return "jmp %%pc@(2,%0:w)"; \ 110 } while (0) 111 112 /* This is how to output an assembler line that says to advance the 113 location counter to a multiple of 2**LOG bytes. */ 114 115 #undef ASM_OUTPUT_ALIGN 116 #define ASM_OUTPUT_ALIGN(FILE,LOG) \ 117 if ((LOG) > 0) \ 118 fprintf ((FILE), "%s%u\n", ALIGN_ASM_OP, 1 << (LOG)); 119 120 /* If defined, a C expression whose value is a string containing the 121 assembler operation to identify the following data as uninitialized global 122 data. */ 123 124 #define BSS_SECTION_ASM_OP "\t.section\t.bss" 125 126 /* A C statement (sans semicolon) to output to the stdio stream 127 FILE the assembler definition of uninitialized global DECL named 128 NAME whose size is SIZE bytes and alignment is ALIGN bytes. 129 Try to use asm_output_aligned_bss to implement this macro. */ 130 131 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \ 132 asm_output_aligned_bss (FILE, DECL, NAME, SIZE, ALIGN) 133 134 /* Output assembler code to FILE to increment profiler label # LABELNO 135 for profiling a function entry. */ 136 #define NO_PROFILE_COUNTERS 1 137 #undef FUNCTION_PROFILER 138 #define FUNCTION_PROFILER(FILE, LABELNO) \ 139 { \ 140 if (flag_pic) \ 141 fprintf (FILE, "\tbsr.l _mcount@PLTPC\n"); \ 142 else \ 143 fprintf (FILE, "\tjbsr _mcount\n"); \ 144 } 145 146 /* Do not break .stabs pseudos into continuations. */ 147 148 #define DBX_CONTIN_LENGTH 0 149 150 /* 1 if N is a possible register number for a function value. For 151 m68k/SVR4 allow d0, a0, or fp0 as return registers, for integral, 152 pointer, or floating types, respectively. Reject fp0 if not using 153 a 68881 coprocessor. */ 154 155 #undef FUNCTION_VALUE_REGNO_P 156 #define FUNCTION_VALUE_REGNO_P(N) \ 157 ((N) == D0_REG || (N) == A0_REG || (TARGET_68881 && (N) == FP0_REG)) 158 159 /* Define this to be true when FUNCTION_VALUE_REGNO_P is true for 160 more than one register. */ 161 162 #undef NEEDS_UNTYPED_CALL 163 #define NEEDS_UNTYPED_CALL 1 164 165 /* Define how to generate (in the callee) the output value of a 166 function and how to find (in the caller) the value returned by a 167 function. VALTYPE is the data type of the value (as a tree). If 168 the precise function being called is known, FUNC is its 169 FUNCTION_DECL; otherwise, FUNC is 0. For m68k/SVR4 generate the 170 result in d0, a0, or fp0 as appropriate. */ 171 172 #undef FUNCTION_VALUE 173 #define FUNCTION_VALUE(VALTYPE, FUNC) \ 174 m68k_function_value (VALTYPE, FUNC) 175 176 /* Define how to find the value returned by a library function 177 assuming the value has mode MODE. 178 For m68k/SVR4 look for integer values in d0, pointer values in d0 179 (returned in both d0 and a0), and floating values in fp0. */ 180 181 #undef LIBCALL_VALUE 182 #define LIBCALL_VALUE(MODE) \ 183 m68k_libcall_value (MODE) 184 185 /* For m68k SVR4, structures are returned using the reentrant 186 technique. */ 187 #undef PCC_STATIC_STRUCT_RETURN 188 #define DEFAULT_PCC_STRUCT_RETURN 0 189 190 /* Finalize the trampoline by flushing the insn cache. */ 191 192 #undef FINALIZE_TRAMPOLINE 193 #define FINALIZE_TRAMPOLINE(TRAMP) \ 194 emit_library_call (gen_rtx_SYMBOL_REF (Pmode, "__clear_cache"), \ 195 LCT_NORMAL, VOIDmode, TRAMP, Pmode, \ 196 plus_constant (Pmode, TRAMP, TRAMPOLINE_SIZE), \ 197 Pmode); 198 199 /* Clear the instruction cache from `beg' to `end'. This makes an 200 inline system call to SYS_cacheflush. The arguments are as 201 follows: 202 203 cacheflush (addr, scope, cache, len) 204 205 addr - the start address for the flush 206 scope - the scope of the flush (see the cpush insn) 207 cache - which cache to flush (see the cpush insn) 208 len - a factor relating to the number of flushes to perform: 209 len/16 lines, or len/4096 pages. */ 210 211 #define CLEAR_INSN_CACHE(BEG, END) \ 212 { \ 213 register unsigned long _beg __asm ("%d1") = (unsigned long) (BEG); \ 214 unsigned long _end = (unsigned long) (END); \ 215 register unsigned long _len __asm ("%d4") = (_end - _beg + 32); \ 216 __asm __volatile \ 217 ("move%.l #123, %/d0\n\t" /* system call nr */ \ 218 "move%.l #1, %/d2\n\t" /* clear lines */ \ 219 "move%.l #3, %/d3\n\t" /* insn+data caches */ \ 220 "trap #0" \ 221 : /* no outputs */ \ 222 : "d" (_beg), "d" (_len) \ 223 : "%d0", "%d2", "%d3"); \ 224 } 225 226 #define TARGET_ASM_FILE_END file_end_indicate_exec_stack 227 228 #undef DBX_REGISTER_NUMBER 229 #define DBX_REGISTER_NUMBER(REGNO) (REGNO) 230 231 #undef SIZE_TYPE 232 #define SIZE_TYPE "unsigned int" 233 234 #undef PTRDIFF_TYPE 235 #define PTRDIFF_TYPE "int" 236 237 #undef WCHAR_TYPE 238 #define WCHAR_TYPE "long int" 239 240 #undef WCHAR_TYPE_SIZE 241 #define WCHAR_TYPE_SIZE BITS_PER_WORD 242 243 /* Install the __sync libcalls. */ 244 #undef TARGET_INIT_LIBFUNCS 245 #define TARGET_INIT_LIBFUNCS m68k_init_sync_libfuncs 246