gcc/config/mips/linux.h

   1 /* Definitions for MIPS running Linux-based GNU systems with ELF format.
   2    Copyright (C) 1998, 1999, 2000, 2001, 2002 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 "mips/mips.h"
  22 #include "mips/abi64.h"
  23
  24 #undef WCHAR_TYPE
  25 #define WCHAR_TYPE "int"
  26
  27 #undef WCHAR_TYPE_SIZE
  28 #define WCHAR_TYPE_SIZE 32
  29
  30 /* If defined, a C expression whose value is a string containing the
  31    assembler operation to identify the following data as
  32    uninitialized global data.  If not defined, and neither
  33    `ASM_OUTPUT_BSS' nor `ASM_OUTPUT_ALIGNED_BSS' are defined,
  34    uninitialized global data will be output in the data section if
  35    `-fno-common' is passed, otherwise `ASM_OUTPUT_COMMON' will be
  36    used.  */
  37 #define BSS_SECTION_ASM_OP      "\t.section\t.bss"
  38
  39 #define SBSS_SECTION_ASM_OP     "\t.section .sbss"
  40
  41 /* Like `ASM_OUTPUT_BSS' except takes the required alignment as a
  42    separate, explicit argument.  If you define this macro, it is used
  43    in place of `ASM_OUTPUT_BSS', and gives you more flexibility in
  44    handling the required alignment of the variable.  The alignment is
  45    specified as the number of bits.
  46
  47    Try to use function `asm_output_aligned_bss' defined in file
  48    `varasm.c' when defining this macro.  */
  49 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN)   \
  50 do {                                                            \
  51   ASM_GLOBALIZE_LABEL (FILE, NAME);                             \
  52   if (SIZE > 0 && SIZE <= mips_section_threshold)               \
  53     sbss_section ();                                            \
  54   else                                                          \
  55     bss_section ();                                             \
  56   ASM_OUTPUT_ALIGN (FILE, floor_log2 (ALIGN / BITS_PER_UNIT));  \
  57   last_assemble_variable_decl = DECL;                           \
  58   ASM_DECLARE_OBJECT_NAME (FILE, NAME, DECL);                   \
  59   ASM_OUTPUT_SKIP (FILE, SIZE ? SIZE : 1);                      \
  60 } while (0)
  61
  62 /* These macros generate the special .type and .size directives which
  63    are used to set the corresponding fields of the linker symbol table
  64    entries in an ELF object file under SVR4.  These macros also output
  65    the starting labels for the relevant functions/objects.  */
  66
  67 /* Write the extra assembler code needed to declare an object properly.  */
  68
  69 #undef ASM_DECLARE_OBJECT_NAME
  70 #define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL)               \
  71   do {                                                          \
  72     fprintf (FILE, "%s", TYPE_ASM_OP);                          \
  73     assemble_name (FILE, NAME);                                 \
  74     putc (',', FILE);                                           \
  75     fprintf (FILE, TYPE_OPERAND_FMT, "object");                 \
  76     putc ('\n', FILE);                                          \
  77     size_directive_output = 0;                                  \
  78     if (!flag_inhibit_size_directive && DECL_SIZE (DECL))       \
  79       {                                                         \
  80         size_directive_output = 1;                              \
  81         fprintf (FILE, "%s", SIZE_ASM_OP);                      \
  82         assemble_name (FILE, NAME);                             \
  83         fprintf (FILE, ",");                                    \
  84         fprintf (FILE, HOST_WIDE_INT_PRINT_DEC,                 \
  85                  int_size_in_bytes (TREE_TYPE (DECL)));         \
  86         fprintf (FILE, "\n");                                   \
  87       }                                                         \
  88     mips_declare_object (FILE, NAME, "", ":\n", 0);             \
  89   } while (0)
  90
  91 #undef UNIQUE_SECTION
  92 #define UNIQUE_SECTION(DECL,RELOC) \
  93   mips_unique_section ((DECL), (RELOC))
  94
  95 /* A list of other sections which the compiler might be "in" at any
  96    given time.  */
  97 #undef EXTRA_SECTIONS
  98 #define EXTRA_SECTIONS in_sdata, in_sbss, in_rdata
  99
 100 #undef EXTRA_SECTION_FUNCTIONS
 101 #define EXTRA_SECTION_FUNCTIONS                                         \
 102   SECTION_FUNCTION_TEMPLATE(sdata_section, in_sdata, SDATA_SECTION_ASM_OP) \
 103   SECTION_FUNCTION_TEMPLATE(sbss_section, in_sbss, SBSS_SECTION_ASM_OP) \
 104   SECTION_FUNCTION_TEMPLATE(rdata_section, in_rdata, RDATA_SECTION_ASM_OP)
 105
 106 #define SECTION_FUNCTION_TEMPLATE(FN, ENUM, OP)                 \
 107 void FN ()                                                      \
 108 {                                                               \
 109   if (in_section != ENUM)                                       \
 110     {                                                           \
 111       fprintf (asm_out_file, "%s\n", OP);                       \
 112       in_section = ENUM;                                        \
 113     }                                                           \
 114 }
 115
 116 #undef TARGET_VERSION
 117 #if TARGET_ENDIAN_DEFAULT == 0
 118 #define TARGET_VERSION fprintf (stderr, " (MIPSel GNU/Linux with ELF)");
 119 #else
 120 #define TARGET_VERSION fprintf (stderr, " (MIPS GNU/Linux with ELF)");
 121 #endif
 122
 123 #undef MD_EXEC_PREFIX
 124 #undef MD_STARTFILE_PREFIX
 125
 126 /* Required to keep collect2.c happy */
 127 #undef OBJECT_FORMAT_COFF
 128
 129 /* If we don't set MASK_ABICALLS, we can't default to PIC.  */
 130 #undef TARGET_DEFAULT
 131 #define TARGET_DEFAULT (MASK_ABICALLS|MASK_GAS)
 132
 133 /* Specify predefined symbols in preprocessor.  */
 134 #undef CPP_PREDEFINES
 135 #if TARGET_ENDIAN_DEFAULT == 0
 136 #define CPP_PREDEFINES "-DMIPSEL -D_MIPSEL -Dunix -Dmips -D_mips \
 137 -DR3000 -D_R3000 -D__gnu_linux__ -Dlinux -Asystem=posix -Acpu=mips \
 138 -Amachine=mips -D__ELF__ -D__PIC__ -D__pic__"
 139 #else
 140 #define CPP_PREDEFINES "-DMIPSEB -D_MIPSEB -Dunix -Dmips -D_mips \
 141 -DR3000 -D_R3000 -D__gnu_linux__ -Dlinux -Asystem=posix -Acpu=mips \
 142 -Amachine=mips -D__ELF__ -D__PIC__ -D__pic__"
 143 #endif
 144
 145 #undef SUBTARGET_CPP_SIZE_SPEC
 146 #define SUBTARGET_CPP_SIZE_SPEC "\
 147 %{mabi=32: -D__SIZE_TYPE__=unsigned\\ int -D__PTRDIFF_TYPE__=int} \
 148 %{mabi=n32: -D__SIZE_TYPE__=unsigned\\ int -D__PTRDIFF_TYPE__=int} \
 149 %{mabi=64: -D__SIZE_TYPE__=long\\ unsigned\\ int -D__PTRDIFF_TYPE__=long\\ int} \
 150 %{!mabi*: -D__SIZE_TYPE__=unsigned\\ int -D__PTRDIFF_TYPE__=int}"
 151
 152 /* We must make -mips3 do what -mlong64 used to do.  */
 153 /* ??? If no mipsX option given, but a mabi=X option is, then should set
 154    _MIPS_ISA based on the mabi=X option.  */
 155 /* ??? If no mabi=X option give, but a mipsX option is, then should set
 156    _MIPS_SIM based on the mipsX option.  */
 157 /* ??? Same for _MIPS_SZINT.  */
 158 /* ??? Same for _MIPS_SZPTR.  */
 159 /* ??? Same for __SIZE_TYPE and __PTRDIFF_TYPE.  */
 160 #undef SUBTARGET_CPP_SPEC
 161 #define SUBTARGET_CPP_SPEC "\
 162 %{mfp32: -D_MIPS_FPSET=16} \
 163 %{mfp64: -D_MIPS_FPSET=32} \
 164 %{!mfp*: -D_MIPS_FPSET=32} \
 165 %{mips1: -D_MIPS_ISA=_MIPS_ISA_MIPS1} \
 166 %{mips2: -D_MIPS_ISA=_MIPS_ISA_MIPS2} \
 167 %{mips3: -D_MIPS_ISA=_MIPS_ISA_MIPS3} \
 168 %{mips4: -D_MIPS_ISA=_MIPS_ISA_MIPS4} \
 169 %{!mips*: -D_MIPS_ISA=_MIPS_ISA_MIPS1} \
 170 %{mabi=32: -D_MIPS_SIM=_MIPS_SIM_ABI32} \
 171 %{mabi=n32: -D_ABIN32=2 -D_MIPS_SIM=_ABIN32} \
 172 %{mabi=64: -D_ABI64=3 -D_MIPS_SIM=_ABI64} \
 173 %{!mabi*: -D_MIPS_SIM=_MIPS_SIM_ABI32}  \
 174 %{!mint64: -D_MIPS_SZINT=32}%{mint64: -D_MIPS_SZINT=64} \
 175 %{mabi=32: -D_MIPS_SZLONG=32} \
 176 %{mabi=n32: -D_MIPS_SZLONG=32} \
 177 %{mabi=64: -D_MIPS_SZLONG=64} \
 178 %{!mabi*: -D_MIPS_SZLONG=32} \
 179 %{mabi=32: -D_MIPS_SZPTR=32} \
 180 %{mabi=n32: -D_MIPS_SZPTR=32} \
 181 %{mabi=64: -D_MIPS_SZPTR=64} \
 182 %{!mabi*: -D_MIPS_SZPTR=32} \
 183 %{!mips*: -U__mips -D__mips} \
 184 %{mabi=32: -U__mips64} \
 185 %{mabi=n32: -D__mips64} \
 186 %{mabi=64: -U__mips64} \
 187 %{!mabi*: -U__mips64} \
 188 %{fno-PIC:-U__PIC__ -U__pic__} %{fno-pic:-U__PIC__ -U__pic__} \
 189 %{fPIC:-D__PIC__ -D__pic__} %{fpic:-D__PIC__ -D__pic__} \
 190 %{pthread:-D_REENTRANT}"
 191
 192 /* The GNU C++ standard library requires that these macros be defined.  */
 193 #undef CPLUSPLUS_CPP_SPEC
 194 #define CPLUSPLUS_CPP_SPEC "\
 195 -D__LANGUAGE_C_PLUS_PLUS -D_LANGUAGE_C_PLUS_PLUS \
 196 -D_GNU_SOURCE %(cpp) \
 197 "
 198
 199 /* From iris5.h */
 200 /* -G is incompatible with -KPIC which is the default, so only allow objects
 201    in the small data section if the user explicitly asks for it.  */
 202 #undef MIPS_DEFAULT_GVALUE
 203 #define MIPS_DEFAULT_GVALUE 0
 204
 205 /* Borrowed from sparc/linux.h */
 206 #undef LINK_SPEC
 207 #define LINK_SPEC \
 208  "%(endian_spec) \
 209   %{shared:-shared} \
 210   %{!shared: \
 211     %{!ibcs: \
 212       %{!static: \
 213         %{rdynamic:-export-dynamic} \
 214         %{!dynamic-linker:-dynamic-linker /lib/ld.so.1}} \
 215         %{static:-static}}}"
 216
 217
 218 #undef SUBTARGET_ASM_SPEC
 219 #define SUBTARGET_ASM_SPEC "\
 220 %{mabi=64: -64} \
 221 %{!fno-PIC:%{!fno-pic:-KPIC}} \
 222 %{fno-PIC:-non_shared} %{fno-pic:-non_shared}"
 223
 224 #undef SUBTARGET_ASM_DEBUGGING_SPEC
 225 #define SUBTARGET_ASM_DEBUGGING_SPEC "-g0"
 226
 227 /* The MIPS assembler has different syntax for .set. We set it to
 228    .dummy to trap any errors.  */
 229 #undef SET_ASM_OP
 230 #define SET_ASM_OP "\t.dummy\t"
 231
 232 #undef ASM_OUTPUT_DEF
 233 #define ASM_OUTPUT_DEF(FILE,LABEL1,LABEL2)                              \
 234  do {                                                                   \
 235         fputc ( '\t', FILE);                                            \
 236         assemble_name (FILE, LABEL1);                                   \
 237         fputs ( " = ", FILE);                                           \
 238         assemble_name (FILE, LABEL2);                                   \
 239         fputc ( '\n', FILE);                                            \
 240  } while (0)
 241
 242 #undef ASM_OUTPUT_DEFINE_LABEL_DIFFERENCE_SYMBOL
 243 #define ASM_OUTPUT_DEFINE_LABEL_DIFFERENCE_SYMBOL(FILE, SY, HI, LO)     \
 244   do {                                                                  \
 245         fputc ('\t', FILE);                                             \
 246         assemble_name (FILE, SY);                                       \
 247         fputc ('=', FILE);                                              \
 248         assemble_name (FILE, HI);                                       \
 249         fputc ('-', FILE);                                              \
 250         assemble_name (FILE, LO);                                       \
 251   } while (0)
 252
 253 #undef ASM_DECLARE_FUNCTION_NAME
 254 #define ASM_DECLARE_FUNCTION_NAME(STREAM, NAME, DECL)                   \
 255   do {                                                                  \
 256     if (!flag_inhibit_size_directive)                                   \
 257       {                                                                 \
 258         fputs ("\t.ent\t", STREAM);                                     \
 259         assemble_name (STREAM, NAME);                                   \
 260         putc ('\n', STREAM);                                            \
 261       }                                                                 \
 262     fprintf (STREAM, "\t%s\t ", TYPE_ASM_OP);                           \
 263     assemble_name (STREAM, NAME);                                       \
 264     putc (',', STREAM);                                                 \
 265     fprintf (STREAM, TYPE_OPERAND_FMT, "function");                     \
 266     putc ('\n', STREAM);                                                \
 267     assemble_name (STREAM, NAME);                                       \
 268     fputs (":\n", STREAM);                                              \
 269   } while (0)
 270
 271 #undef ASM_DECLARE_FUNCTION_SIZE
 272 #define ASM_DECLARE_FUNCTION_SIZE(STREAM, NAME, DECL)                   \
 273   do {                                                                  \
 274     if (!flag_inhibit_size_directive)                                   \
 275       {                                                                 \
 276         fputs ("\t.end\t", STREAM);                                     \
 277         assemble_name (STREAM, NAME);                                   \
 278         putc ('\n', STREAM);                                            \
 279       }                                                                 \
 280   } while (0)
 281
 282 /* Tell function_prologue in mips.c that we have already output the .ent/.end
 283    pseudo-ops.  */
 284 #define FUNCTION_NAME_ALREADY_DECLARED
 285
 286 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE, GLOBAL)                      \
 287   (flag_pic                                                             \
 288     ? ((GLOBAL) ? DW_EH_PE_indirect : 0) | DW_EH_PE_pcrel | DW_EH_PE_sdata4\
 289    : DW_EH_PE_absptr)
 290
 291 /* The glibc _mcount stub will save $v0 for us.  Don't mess with saving
 292    it, since ASM_OUTPUT_REG_PUSH/ASM_OUTPUT_REG_POP do not work in the
 293    presence of $gp-relative calls.  */
 294 #undef ASM_OUTPUT_REG_PUSH
 295 #undef ASM_OUTPUT_REG_POP