1 /* Definitions for Motorola 68k running Linux-based GNU systems with 2 ELF format. 3 Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2002, 2003, 2004, 2006, 4 2007, 2009 Free Software Foundation, Inc. 5 6 This file is part of GCC. 7 8 GCC is free software; you can redistribute it and/or modify 9 it under the terms of the GNU General Public License as published by 10 the Free Software Foundation; either version 3, or (at your option) 11 any later version. 12 13 GCC is distributed in the hope that it will be useful, 14 but WITHOUT ANY WARRANTY; without even the implied warranty of 15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 GNU General Public License for more details. 17 18 You should have received a copy of the GNU General Public License 19 along with GCC; see the file COPYING3. If not see 20 <http://www.gnu.org/licenses/>. */ 21 22 #undef TARGET_VERSION 23 #define TARGET_VERSION fprintf (stderr, " (68k GNU/Linux with ELF)"); 24 25 /* Add %(asm_cpu_spec) to the svr4.h definition of ASM_SPEC. */ 26 #undef ASM_SPEC 27 #define ASM_SPEC "%(asm_cpu_spec) %(asm_pcrel_spec) \ 28 %{v:-V} %{Qy:} %{!Qn:-Qy} %{n} %{T} %{Ym,*} %{Yd,*}" 29 30 #undef PREFERRED_STACK_BOUNDARY 31 #define PREFERRED_STACK_BOUNDARY 32 32 33 /* for 68k machines this only needs to be TRUE for the 68000 */ 34 35 #undef STRICT_ALIGNMENT 36 #define STRICT_ALIGNMENT 0 37 #undef M68K_HONOR_TARGET_STRICT_ALIGNMENT 38 #define M68K_HONOR_TARGET_STRICT_ALIGNMENT 0 39 40 /* Here are four prefixes that are used by asm_fprintf to 41 facilitate customization for alternate assembler syntaxes. 42 Machines with no likelihood of an alternate syntax need not 43 define these and need not use asm_fprintf. */ 44 45 /* The prefix for register names. Note that REGISTER_NAMES 46 is supposed to include this prefix. Also note that this is NOT an 47 fprintf format string, it is a literal string */ 48 49 #undef REGISTER_PREFIX 50 #define REGISTER_PREFIX "%" 51 52 /* The prefix for local (compiler generated) labels. 53 These labels will not appear in the symbol table. */ 54 55 #undef LOCAL_LABEL_PREFIX 56 #define LOCAL_LABEL_PREFIX "." 57 58 /* The prefix to add to user-visible assembler symbols. */ 59 60 #undef USER_LABEL_PREFIX 61 #define USER_LABEL_PREFIX "" 62 63 #define ASM_COMMENT_START "|" 64 65 /* Target OS builtins. */ 66 #define TARGET_OS_CPP_BUILTINS() LINUX_TARGET_OS_CPP_BUILTINS() 67 68 #undef CPP_SPEC 69 #define CPP_SPEC "%{posix:-D_POSIX_SOURCE} %{pthread:-D_REENTRANT}" 70 71 /* Provide a LINK_SPEC appropriate for GNU/Linux. Here we provide support 72 for the special GCC options -static and -shared, which allow us to 73 link things in one of these three modes by applying the appropriate 74 combinations of options at link-time. We like to support here for 75 as many of the other GNU linker options as possible. But I don't 76 have the time to search for those flags. I am sure how to add 77 support for -soname shared_object_name. H.J. 78 79 I took out %{v:%{!V:-V}}. It is too much :-(. They can use 80 -Wl,-V. 81 82 When the -shared link option is used a final link is not being 83 done. */ 84 85 /* If ELF is the default format, we should not use /lib/elf. */ 86 87 #define GLIBC_DYNAMIC_LINKER "/lib/ld.so.1" 88 89 #undef LINK_SPEC 90 #define LINK_SPEC "-m m68kelf %{shared} \ 91 %{!shared: \ 92 %{!static: \ 93 %{rdynamic:-export-dynamic} \ 94 %{!dynamic-linker*:-dynamic-linker " LINUX_DYNAMIC_LINKER "}} \ 95 %{static}}" 96 97 /* For compatibility with linux/a.out */ 98 99 #undef PCC_BITFIELD_TYPE_MATTERS 100 101 /* Currently, JUMP_TABLES_IN_TEXT_SECTION must be defined in order to 102 keep switch tables in the text section. */ 103 104 #define JUMP_TABLES_IN_TEXT_SECTION 1 105 106 /* Use the default action for outputting the case label. */ 107 #undef ASM_OUTPUT_CASE_LABEL 108 #define ASM_RETURN_CASE_JUMP \ 109 do { \ 110 if (TARGET_COLDFIRE) \ 111 { \ 112 if (ADDRESS_REG_P (operands[0])) \ 113 return "jmp %%pc@(2,%0:l)"; \ 114 else \ 115 return "ext%.l %0\n\tjmp %%pc@(2,%0:l)"; \ 116 } \ 117 else \ 118 return "jmp %%pc@(2,%0:w)"; \ 119 } while (0) 120 121 /* This is how to output an assembler line that says to advance the 122 location counter to a multiple of 2**LOG bytes. */ 123 124 #undef ASM_OUTPUT_ALIGN 125 #define ASM_OUTPUT_ALIGN(FILE,LOG) \ 126 if ((LOG) > 0) \ 127 fprintf ((FILE), "%s%u\n", ALIGN_ASM_OP, 1 << (LOG)); 128 129 /* If defined, a C expression whose value is a string containing the 130 assembler operation to identify the following data as uninitialized global 131 data. */ 132 133 #define BSS_SECTION_ASM_OP "\t.section\t.bss" 134 135 /* A C statement (sans semicolon) to output to the stdio stream 136 FILE the assembler definition of uninitialized global DECL named 137 NAME whose size is SIZE bytes and alignment is ALIGN bytes. 138 Try to use asm_output_aligned_bss to implement this macro. */ 139 140 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \ 141 asm_output_aligned_bss (FILE, DECL, NAME, SIZE, ALIGN) 142 143 /* Output assembler code to FILE to increment profiler label # LABELNO 144 for profiling a function entry. */ 145 #define NO_PROFILE_COUNTERS 1 146 #undef FUNCTION_PROFILER 147 #define FUNCTION_PROFILER(FILE, LABELNO) \ 148 { \ 149 if (flag_pic) \ 150 fprintf (FILE, "\tbsr.l _mcount@PLTPC\n"); \ 151 else \ 152 fprintf (FILE, "\tjbsr _mcount\n"); \ 153 } 154 155 /* Do not break .stabs pseudos into continuations. */ 156 157 #define DBX_CONTIN_LENGTH 0 158 159 /* 1 if N is a possible register number for a function value. For 160 m68k/SVR4 allow d0, a0, or fp0 as return registers, for integral, 161 pointer, or floating types, respectively. Reject fp0 if not using 162 a 68881 coprocessor. */ 163 164 #undef FUNCTION_VALUE_REGNO_P 165 #define FUNCTION_VALUE_REGNO_P(N) \ 166 ((N) == D0_REG || (N) == A0_REG || (TARGET_68881 && (N) == FP0_REG)) 167 168 /* Define this to be true when FUNCTION_VALUE_REGNO_P is true for 169 more than one register. */ 170 171 #undef NEEDS_UNTYPED_CALL 172 #define NEEDS_UNTYPED_CALL 1 173 174 /* Define how to generate (in the callee) the output value of a 175 function and how to find (in the caller) the value returned by a 176 function. VALTYPE is the data type of the value (as a tree). If 177 the precise function being called is known, FUNC is its 178 FUNCTION_DECL; otherwise, FUNC is 0. For m68k/SVR4 generate the 179 result in d0, a0, or fp0 as appropriate. */ 180 181 #undef FUNCTION_VALUE 182 #define FUNCTION_VALUE(VALTYPE, FUNC) \ 183 m68k_function_value (VALTYPE, FUNC) 184 185 /* Define how to find the value returned by a library function 186 assuming the value has mode MODE. 187 For m68k/SVR4 look for integer values in d0, pointer values in d0 188 (returned in both d0 and a0), and floating values in fp0. */ 189 190 #undef LIBCALL_VALUE 191 #define LIBCALL_VALUE(MODE) \ 192 m68k_libcall_value (MODE) 193 194 /* For m68k SVR4, structures are returned using the reentrant 195 technique. */ 196 #undef PCC_STATIC_STRUCT_RETURN 197 #define DEFAULT_PCC_STRUCT_RETURN 0 198 199 /* Finalize the trampoline by flushing the insn cache. */ 200 201 #undef FINALIZE_TRAMPOLINE 202 #define FINALIZE_TRAMPOLINE(TRAMP) \ 203 emit_library_call (gen_rtx_SYMBOL_REF (Pmode, "__clear_cache"), \ 204 LCT_NORMAL, VOIDmode, 2, TRAMP, Pmode, \ 205 plus_constant (TRAMP, TRAMPOLINE_SIZE), Pmode); 206 207 /* Clear the instruction cache from `beg' to `end'. This makes an 208 inline system call to SYS_cacheflush. The arguments are as 209 follows: 210 211 cacheflush (addr, scope, cache, len) 212 213 addr - the start address for the flush 214 scope - the scope of the flush (see the cpush insn) 215 cache - which cache to flush (see the cpush insn) 216 len - a factor relating to the number of flushes to perform: 217 len/16 lines, or len/4096 pages. */ 218 219 #define CLEAR_INSN_CACHE(BEG, END) \ 220 { \ 221 register unsigned long _beg __asm ("%d1") = (unsigned long) (BEG); \ 222 unsigned long _end = (unsigned long) (END); \ 223 register unsigned long _len __asm ("%d4") = (_end - _beg + 32); \ 224 __asm __volatile \ 225 ("move%.l #123, %/d0\n\t" /* system call nr */ \ 226 "move%.l #1, %/d2\n\t" /* clear lines */ \ 227 "move%.l #3, %/d3\n\t" /* insn+data caches */ \ 228 "trap #0" \ 229 : /* no outputs */ \ 230 : "d" (_beg), "d" (_len) \ 231 : "%d0", "%d2", "%d3"); \ 232 } 233 234 #define TARGET_ASM_FILE_END file_end_indicate_exec_stack 235 236 #define MD_UNWIND_SUPPORT "config/m68k/linux-unwind.h" 237