gcc/config/mips/linux.h

   1 /* Definitions for MIPS running Linux-based GNU systems with ELF format.
   2    Copyright (C) 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
   3
   4 This file is part of GNU CC.
   5
   6 GNU CC is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU CC is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU CC; see the file COPYING.  If not, write to
  18 the Free Software Foundation, 59 Temple Place - Suite 330,
  19 Boston, MA 02111-1307, USA.  */
  20
  21 #include "gofast.h"
  22
  23 /* US Software GOFAST library support.  */
  24 #define INIT_SUBTARGET_OPTABS INIT_GOFAST_OPTABS
  25
  26 #include "mips/mips.h"
  27
  28 #undef WCHAR_TYPE
  29 #define WCHAR_TYPE "int"
  30
  31 #undef WCHAR_TYPE_SIZE
  32 #define WCHAR_TYPE_SIZE 32
  33
  34 /* If defined, a C expression whose value is a string containing the
  35    assembler operation to identify the following data as
  36    uninitialized global data.  If not defined, and neither
  37    `ASM_OUTPUT_BSS' nor `ASM_OUTPUT_ALIGNED_BSS' are defined,
  38    uninitialized global data will be output in the data section if
  39    `-fno-common' is passed, otherwise `ASM_OUTPUT_COMMON' will be
  40    used.  */
  41 #define BSS_SECTION_ASM_OP      "\t.section\t.bss"
  42
  43 #define SBSS_SECTION_ASM_OP     "\t.section .sbss"
  44
  45 /* Like `ASM_OUTPUT_BSS' except takes the required alignment as a
  46    separate, explicit argument.  If you define this macro, it is used
  47    in place of `ASM_OUTPUT_BSS', and gives you more flexibility in
  48    handling the required alignment of the variable.  The alignment is
  49    specified as the number of bits.
  50
  51    Try to use function `asm_output_aligned_bss' defined in file
  52    `varasm.c' when defining this macro.  */
  53 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN)   \
  54 do {                                                            \
  55   ASM_GLOBALIZE_LABEL (FILE, NAME);                             \
  56   if (SIZE > 0 && SIZE <= mips_section_threshold)               \
  57     sbss_section ();                                            \
  58   else                                                          \
  59     bss_section ();                                             \
  60   ASM_OUTPUT_ALIGN (FILE, floor_log2 (ALIGN / BITS_PER_UNIT));  \
  61   last_assemble_variable_decl = DECL;                           \
  62   ASM_DECLARE_OBJECT_NAME (FILE, NAME, DECL);                   \
  63   ASM_OUTPUT_SKIP (FILE, SIZE ? SIZE : 1);                      \
  64 } while (0)
  65
  66 /* These macros generate the special .type and .size directives which
  67    are used to set the corresponding fields of the linker symbol table
  68    entries in an ELF object file under SVR4.  These macros also output
  69    the starting labels for the relevant functions/objects.  */
  70
  71 /* Write the extra assembler code needed to declare an object properly.  */
  72
  73 #undef ASM_DECLARE_OBJECT_NAME
  74 #define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL)               \
  75   do {                                                          \
  76     fprintf (FILE, "%s", TYPE_ASM_OP);                          \
  77     assemble_name (FILE, NAME);                                 \
  78     putc (',', FILE);                                           \
  79     fprintf (FILE, TYPE_OPERAND_FMT, "object");                 \
  80     putc ('\n', FILE);                                          \
  81     size_directive_output = 0;                                  \
  82     if (!flag_inhibit_size_directive && DECL_SIZE (DECL))       \
  83       {                                                         \
  84         size_directive_output = 1;                              \
  85         fprintf (FILE, "%s", SIZE_ASM_OP);                      \
  86         assemble_name (FILE, NAME);                             \
  87         fprintf (FILE, ",");                                    \
  88         fprintf (FILE, HOST_WIDE_INT_PRINT_DEC,                 \
  89                  int_size_in_bytes (TREE_TYPE (DECL)));         \
  90         fprintf (FILE, "\n");                                   \
  91       }                                                         \
  92     mips_declare_object (FILE, NAME, "", ":\n", 0);             \
  93   } while (0)
  94
  95 #undef UNIQUE_SECTION
  96 #define UNIQUE_SECTION(DECL,RELOC) \
  97   mips_unique_section ((DECL), (RELOC))
  98
  99 /* A list of other sections which the compiler might be "in" at any
 100    given time.  */
 101 #undef EXTRA_SECTIONS
 102 #define EXTRA_SECTIONS in_sdata, in_sbss, in_rdata
 103
 104 #undef EXTRA_SECTION_FUNCTIONS
 105 #define EXTRA_SECTION_FUNCTIONS                                         \
 106   SECTION_FUNCTION_TEMPLATE(sdata_section, in_sdata, SDATA_SECTION_ASM_OP) \
 107   SECTION_FUNCTION_TEMPLATE(sbss_section, in_sbss, SBSS_SECTION_ASM_OP) \
 108   SECTION_FUNCTION_TEMPLATE(rdata_section, in_rdata, RDATA_SECTION_ASM_OP)
 109
 110 #define SECTION_FUNCTION_TEMPLATE(FN, ENUM, OP)                 \
 111 void FN ()                                                      \
 112 {                                                               \
 113   if (in_section != ENUM)                                       \
 114     {                                                           \
 115       fprintf (asm_out_file, "%s\n", OP);                       \
 116       in_section = ENUM;                                        \
 117     }                                                           \
 118 }
 119
 120 #undef TARGET_VERSION
 121 #if TARGET_ENDIAN_DEFAULT == 0
 122 #define TARGET_VERSION fprintf (stderr, " (MIPSel GNU/Linux with ELF)");
 123 #else
 124 #define TARGET_VERSION fprintf (stderr, " (MIPS GNU/Linux with ELF)");
 125 #endif
 126
 127 #undef MD_EXEC_PREFIX
 128 #undef MD_STARTFILE_PREFIX
 129
 130 /* Required to keep collect2.c happy */
 131 #undef OBJECT_FORMAT_COFF
 132
 133 /* If we don't set MASK_ABICALLS, we can't default to PIC.  */
 134 #undef TARGET_DEFAULT
 135 #define TARGET_DEFAULT (MASK_ABICALLS|MASK_GAS)
 136
 137 /* Specify predefined symbols in preprocessor.  */
 138 #undef CPP_PREDEFINES
 139 #if TARGET_ENDIAN_DEFAULT == 0
 140 #define CPP_PREDEFINES "-DMIPSEL -D_MIPSEL -Dunix -Dmips -D_mips \
 141 -DR3000 -D_R3000 -Dlinux -Asystem=posix -Acpu=mips \
 142 -Amachine=mips -D__ELF__ -D__PIC__ -D__pic__"
 143 #else
 144 #define CPP_PREDEFINES "-DMIPSEB -D_MIPSEB -Dunix -Dmips -D_mips \
 145 -DR3000 -D_R3000 -Dlinux -Asystem=posix -Acpu=mips \
 146 -Amachine=mips -D__ELF__ -D__PIC__ -D__pic__"
 147 #endif
 148
 149 #undef SUBTARGET_CPP_SIZE_SPEC
 150 #define SUBTARGET_CPP_SIZE_SPEC "\
 151 %{mabi=32: -D__SIZE_TYPE__=unsigned\\ int -D__PTRDIFF_TYPE__=int} \
 152 %{mabi=n32: -D__SIZE_TYPE__=unsigned\\ int -D__PTRDIFF_TYPE__=int} \
 153 %{mabi=64: -D__SIZE_TYPE__=long\\ unsigned\\ int -D__PTRDIFF_TYPE__=long\\ int} \
 154 %{!mabi*: -D__SIZE_TYPE__=unsigned\\ int -D__PTRDIFF_TYPE__=int}"
 155
 156 /* We must make -mips3 do what -mlong64 used to do.  */
 157 /* ??? If no mipsX option given, but a mabi=X option is, then should set
 158    _MIPS_ISA based on the mabi=X option.  */
 159 /* ??? If no mabi=X option give, but a mipsX option is, then should set
 160    _MIPS_SIM based on the mipsX option.  */
 161 /* ??? Same for _MIPS_SZINT.  */
 162 /* ??? Same for _MIPS_SZPTR.  */
 163 /* ??? Same for __SIZE_TYPE and __PTRDIFF_TYPE.  */
 164 #undef SUBTARGET_CPP_SPEC
 165 #define SUBTARGET_CPP_SPEC "\
 166 %{mfp32: -D_MIPS_FPSET=16} \
 167 %{mfp64: -D_MIPS_FPSET=32} \
 168 %{!mfp*: -D_MIPS_FPSET=32} \
 169 %{mips1: -D_MIPS_ISA=_MIPS_ISA_MIPS1} \
 170 %{mips2: -D_MIPS_ISA=_MIPS_ISA_MIPS2} \
 171 %{mips3: -D_MIPS_ISA=_MIPS_ISA_MIPS3} \
 172 %{mips4: -D_MIPS_ISA=_MIPS_ISA_MIPS4} \
 173 %{!mips*: -D_MIPS_ISA=_MIPS_ISA_MIPS1} \
 174 %{mabi=32: -D_MIPS_SIM=_MIPS_SIM_ABI32} \
 175 %{mabi=n32: -D_ABIN32=2 -D_MIPS_SIM=_ABIN32} \
 176 %{mabi=64: -D_ABI64=3 -D_MIPS_SIM=_ABI64} \
 177 %{!mabi*: -D_MIPS_SIM=_MIPS_SIM_ABI32}  \
 178 %{!mint64: -D_MIPS_SZINT=32}%{mint64: -D_MIPS_SZINT=64} \
 179 %{mabi=32: -D_MIPS_SZLONG=32} \
 180 %{mabi=n32: -D_MIPS_SZLONG=32} \
 181 %{mabi=64: -D_MIPS_SZLONG=64} \
 182 %{!mabi*: -D_MIPS_SZLONG=32} \
 183 %{mabi=32: -D_MIPS_SZPTR=32} \
 184 %{mabi=n32: -D_MIPS_SZPTR=32} \
 185 %{mabi=64: -D_MIPS_SZPTR=64} \
 186 %{!mabi*: -D_MIPS_SZPTR=32} \
 187 %{!mips*: -U__mips -D__mips} \
 188 %{mabi=32: -U__mips64} \
 189 %{mabi=n32: -D__mips64} \
 190 %{mabi=64: -U__mips64} \
 191 %{!mabi*: -U__mips64} \
 192 %{fno-PIC:-U__PIC__ -U__pic__} %{fno-pic:-U__PIC__ -U__pic__} \
 193 %{fPIC:-D__PIC__ -D__pic__} %{fpic:-D__PIC__ -D__pic__} \
 194 %{pthread:-D_REENTRANT}"
 195
 196 /* The GNU C++ standard library requires that these macros be defined.  */
 197 #undef CPLUSPLUS_CPP_SPEC
 198 #define CPLUSPLUS_CPP_SPEC "\
 199 -D__LANGUAGE_C_PLUS_PLUS -D_LANGUAGE_C_PLUS_PLUS \
 200 -D_GNU_SOURCE %(cpp) \
 201 "
 202
 203 /* From iris5.h */
 204 /* -G is incompatible with -KPIC which is the default, so only allow objects
 205    in the small data section if the user explicitly asks for it.  */
 206 #undef MIPS_DEFAULT_GVALUE
 207 #define MIPS_DEFAULT_GVALUE 0
 208
 209 /* Borrowed from sparc/linux.h */
 210 #undef LINK_SPEC
 211 #define LINK_SPEC \
 212  "%(endian_spec) \
 213   %{shared:-shared} \
 214   %{!shared: \
 215     %{!ibcs: \
 216       %{!static: \
 217         %{rdynamic:-export-dynamic} \
 218         %{!dynamic-linker:-dynamic-linker /lib/ld.so.1}} \
 219         %{static:-static}}}"
 220
 221
 222 #undef SUBTARGET_ASM_SPEC
 223 #define SUBTARGET_ASM_SPEC "\
 224 %{mabi=64: -64} \
 225 %{!fno-PIC:%{!fno-pic:-KPIC}} \
 226 %{fno-PIC:-non_shared} %{fno-pic:-non_shared}"
 227
 228 /* The MIPS assembler has different syntax for .set. We set it to
 229    .dummy to trap any errors.  */
 230 #undef SET_ASM_OP
 231 #define SET_ASM_OP "\t.dummy\t"
 232
 233 #undef ASM_OUTPUT_DEF
 234 #define ASM_OUTPUT_DEF(FILE,LABEL1,LABEL2)                              \
 235  do {                                                                   \
 236         fputc ( '\t', FILE);                                            \
 237         assemble_name (FILE, LABEL1);                                   \
 238         fputs ( " = ", FILE);                                           \
 239         assemble_name (FILE, LABEL2);                                   \
 240         fputc ( '\n', FILE);                                            \
 241  } while (0)
 242
 243 #undef ASM_OUTPUT_DEFINE_LABEL_DIFFERENCE_SYMBOL
 244 #define ASM_OUTPUT_DEFINE_LABEL_DIFFERENCE_SYMBOL(FILE, SY, HI, LO)     \
 245   do {                                                                  \
 246         fputc ('\t', FILE);                                             \
 247         assemble_name (FILE, SY);                                       \
 248         fputc ('=', FILE);                                              \
 249         assemble_name (FILE, HI);                                       \
 250         fputc ('-', FILE);                                              \
 251         assemble_name (FILE, LO);                                       \
 252   } while (0)
 253
 254 #undef ASM_DECLARE_FUNCTION_NAME
 255 #define ASM_DECLARE_FUNCTION_NAME(STREAM, NAME, DECL)                   \
 256   do {                                                                  \
 257     if (!flag_inhibit_size_directive)                                   \
 258       {                                                                 \
 259         fputs ("\t.ent\t", STREAM);                                     \
 260         assemble_name (STREAM, NAME);                                   \
 261         putc ('\n', STREAM);                                            \
 262       }                                                                 \
 263     fprintf (STREAM, "\t%s\t ", TYPE_ASM_OP);                           \
 264     assemble_name (STREAM, NAME);                                       \
 265     putc (',', STREAM);                                                 \
 266     fprintf (STREAM, TYPE_OPERAND_FMT, "function");                     \
 267     putc ('\n', STREAM);                                                \
 268     assemble_name (STREAM, NAME);                                       \
 269     fputs (":\n", STREAM);                                              \
 270   } while (0)
 271
 272 #undef ASM_DECLARE_FUNCTION_SIZE
 273 #define ASM_DECLARE_FUNCTION_SIZE(STREAM, NAME, DECL)                   \
 274   do {                                                                  \
 275     if (!flag_inhibit_size_directive)                                   \
 276       {                                                                 \
 277         fputs ("\t.end\t", STREAM);                                     \
 278         assemble_name (STREAM, NAME);                                   \
 279         putc ('\n', STREAM);                                            \
 280       }                                                                 \
 281   } while (0)
 282
 283 /* Tell function_prologue in mips.c that we have already output the .ent/.end
 284    pseudo-ops.  */
 285 #define FUNCTION_NAME_ALREADY_DECLARED