1 /* Definitions of target machine for GNU compiler. MIPS R4000 version with 2 GOFAST floating point library. 3 Copyright (C) 1994, 1995, 1996, 1997, 1999, 2000, 2002 4 Free Software Foundation, Inc. 5 6 This file is part of GNU CC. 7 8 GNU CC 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 2, or (at your option) 11 any later version. 12 13 GNU CC 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 GNU CC; see the file COPYING. If not, write to 20 the Free Software Foundation, 59 Temple Place - Suite 330, 21 Boston, MA 02111-1307, USA. */ 22 23 #undef OBJECT_FORMAT_COFF 24 #undef EXTENDED_COFF 25 26 #undef SDB_DEBUGGING_INFO 27 #define DBX_DEBUGGING_INFO 1 28 #define DWARF2_DEBUGGING_INFO 1 29 30 #undef PREFERRED_DEBUGGING_TYPE 31 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG 32 33 #undef SUBTARGET_ASM_DEBUGGING_SPEC 34 #define SUBTARGET_ASM_DEBUGGING_SPEC "-g0" 35 36 /* Biggest alignment supported by the object file format of this 37 machine. Use this macro to limit the alignment which can be 38 specified using the `__attribute__ ((aligned (N)))' construct. If 39 not defined, the default value is `BIGGEST_ALIGNMENT'. */ 40 41 #undef MAX_OFILE_ALIGNMENT 42 #define MAX_OFILE_ALIGNMENT (32768*8) 43 44 /* Switch into a generic section. */ 45 #undef TARGET_ASM_NAMED_SECTION 46 #define TARGET_ASM_NAMED_SECTION default_elf_asm_named_section 47 48 /* Given that Irix has it's own headers, not having TARGET_GAS here 49 seems a mistake. If we actually need to be prepared for file 50 switching, then we need a custom TARGET_ASM_NAMED_SECTION too. */ 51 52 #undef TEXT_SECTION 53 #define TEXT_SECTION() \ 54 do { \ 55 if (TARGET_FILE_SWITCHING) \ 56 abort (); \ 57 fputs (TEXT_SECTION_ASM_OP, asm_out_file); \ 58 fputc ('\n', asm_out_file); \ 59 } while (0) 60 61 /* The following macro defines the format used to output the second 62 operand of the .type assembler directive. Different svr4 assemblers 63 expect various different forms for this operand. The one given here 64 is just a default. You may need to override it in your machine- 65 specific tm.h file (depending upon the particulars of your assembler). */ 66 67 #define TYPE_OPERAND_FMT "@%s" 68 69 /* Define the strings used for the special svr4 .type and .size directives. 70 These strings generally do not vary from one system running svr4 to 71 another, but if a given system (e.g. m88k running svr) needs to use 72 different pseudo-op names for these, they may be overridden in the 73 file which includes this one. */ 74 75 #undef TYPE_ASM_OP 76 #undef SIZE_ASM_OP 77 #define TYPE_ASM_OP "\t.type\t" 78 #define SIZE_ASM_OP "\t.size\t" 79 80 /* These macros generate the special .type and .size directives which 81 are used to set the corresponding fields of the linker symbol table 82 entries in an ELF object file under SVR4. These macros also output 83 the starting labels for the relevant functions/objects. */ 84 85 /* Write the extra assembler code needed to declare an object properly. */ 86 87 #undef ASM_DECLARE_OBJECT_NAME 88 #define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL) \ 89 do { \ 90 HOST_WIDE_INT size; \ 91 ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "object"); \ 92 size_directive_output = 0; \ 93 if (!flag_inhibit_size_directive && DECL_SIZE (DECL)) \ 94 { \ 95 size_directive_output = 1; \ 96 size = int_size_in_bytes (TREE_TYPE (DECL)); \ 97 ASM_OUTPUT_SIZE_DIRECTIVE (FILE, NAME, size); \ 98 } \ 99 mips_declare_object (FILE, NAME, "", ":\n", 0); \ 100 } while (0) 101 102 /* Output the size directive for a decl in rest_of_decl_compilation 103 in the case where we did not do so before the initializer. 104 Once we find the error_mark_node, we know that the value of 105 size_directive_output was set 106 by ASM_DECLARE_OBJECT_NAME when it was run for the same decl. */ 107 108 #undef ASM_FINISH_DECLARE_OBJECT 109 #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP_LEVEL, AT_END) \ 110 do { \ 111 const char *name = XSTR (XEXP (DECL_RTL (DECL), 0), 0); \ 112 HOST_WIDE_INT size; \ 113 if (!flag_inhibit_size_directive && DECL_SIZE (DECL) \ 114 && ! AT_END && TOP_LEVEL \ 115 && DECL_INITIAL (DECL) == error_mark_node \ 116 && !size_directive_output) \ 117 { \ 118 size_directive_output = 1; \ 119 size = int_size_in_bytes (TREE_TYPE (DECL)); \ 120 ASM_OUTPUT_SIZE_DIRECTIVE (FILE, name, size); \ 121 } \ 122 } while (0) 123 124 #define ASM_OUTPUT_DEF(FILE,LABEL1,LABEL2) \ 125 do { fputc ( '\t', FILE); \ 126 assemble_name (FILE, LABEL1); \ 127 fputs ( " = ", FILE); \ 128 assemble_name (FILE, LABEL2); \ 129 fputc ( '\n', FILE); \ 130 } while (0) 131 132 /* Note about .weak vs. .weakext 133 The mips native assemblers support .weakext, but not .weak. 134 mips-elf gas supports .weak, but not .weakext. 135 mips-elf gas has been changed to support both .weak and .weakext, 136 but until that support is generally available, the 'if' below 137 should serve. */ 138 139 #undef ASM_WEAKEN_LABEL 140 #define ASM_WEAKEN_LABEL(FILE,NAME) ASM_OUTPUT_WEAK_ALIAS(FILE,NAME,0) 141 #define ASM_OUTPUT_WEAK_ALIAS(FILE,NAME,VALUE) \ 142 do { \ 143 if (TARGET_GAS) \ 144 fputs ("\t.weak\t", FILE); \ 145 else \ 146 fputs ("\t.weakext\t", FILE); \ 147 assemble_name (FILE, NAME); \ 148 if (VALUE) \ 149 { \ 150 fputc (' ', FILE); \ 151 assemble_name (FILE, VALUE); \ 152 } \ 153 fputc ('\n', FILE); \ 154 } while (0) 155 156 #define MAKE_DECL_ONE_ONLY(DECL) (DECL_WEAK (DECL) = 1) 157 158 #define TARGET_ASM_UNIQUE_SECTION mips_unique_section 159 160 /* A list of other sections which the compiler might be "in" at any 161 given time. */ 162 #undef EXTRA_SECTIONS 163 #define EXTRA_SECTIONS in_sdata 164 165 #undef EXTRA_SECTION_FUNCTIONS 166 #define EXTRA_SECTION_FUNCTIONS \ 167 SECTION_FUNCTION_TEMPLATE(sdata_section, in_sdata, SDATA_SECTION_ASM_OP) 168 169 #define SECTION_FUNCTION_TEMPLATE(FN, ENUM, OP) \ 170 void FN () \ 171 { \ 172 if (in_section != ENUM) \ 173 { \ 174 fprintf (asm_out_file, "%s\n", OP); \ 175 in_section = ENUM; \ 176 } \ 177 } 178 179 /* On elf, we *do* have support for the .init and .fini sections, and we 180 can put stuff in there to be executed before and after `main'. We let 181 crtstuff.c and other files know this by defining the following symbols. 182 The definitions say how to change sections to the .init and .fini 183 sections. This is the same for all known elf assemblers. */ 184 185 #undef INIT_SECTION_ASM_OP 186 #define INIT_SECTION_ASM_OP "\t.section\t.init" 187 #undef FINI_SECTION_ASM_OP 188 #define FINI_SECTION_ASM_OP "\t.section\t.fini" 189 190 /* Don't set the target flags, this is done by the linker script */ 191 #undef LIB_SPEC 192 #define LIB_SPEC "" 193 194 #undef STARTFILE_SPEC 195 #if defined(HAVE_MIPS_LIBGLOSS_STARTUP_DIRECTIVES) \ 196 || (MIPS_ABI_DEFAULT == ABI_MEABI) 197 #define STARTFILE_SPEC "crti%O%s crtbegin%O%s" 198 #else 199 #define STARTFILE_SPEC "crti%O%s crtbegin%O%s %{!mno-crt0:crt0%O%s}" 200 #endif 201 202 #undef ENDFILE_SPEC 203 #define ENDFILE_SPEC "crtend%O%s crtn%O%s" 204 205 /* We support #pragma. */ 206 #define HANDLE_SYSV_PRAGMA 1 207