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, 2003
   3    Free Software Foundation, Inc.
   4
   5 This file is part of GNU CC.
   6
   7 GNU CC 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 2, or (at your option)
  10 any later version.
  11
  12 GNU CC 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 GNU CC; see the file COPYING.  If not, write to
  19 the Free Software Foundation, 59 Temple Place - Suite 330,
  20 Boston, MA 02111-1307, USA.  */
  21
  22 #undef WCHAR_TYPE
  23 #define WCHAR_TYPE "int"
  24
  25 #undef WCHAR_TYPE_SIZE
  26 #define WCHAR_TYPE_SIZE 32
  27
  28 /* If defined, a C expression whose value is a string containing the
  29    assembler operation to identify the following data as
  30    uninitialized global data.  If not defined, and neither
  31    `ASM_OUTPUT_BSS' nor `ASM_OUTPUT_ALIGNED_BSS' are defined,
  32    uninitialized global data will be output in the data section if
  33    `-fno-common' is passed, otherwise `ASM_OUTPUT_COMMON' will be
  34    used.  */
  35 #define BSS_SECTION_ASM_OP      "\t.section\t.bss"
  36
  37 #define SBSS_SECTION_ASM_OP     "\t.section .sbss"
  38
  39 /* Like `ASM_OUTPUT_BSS' except takes the required alignment as a
  40    separate, explicit argument.  If you define this macro, it is used
  41    in place of `ASM_OUTPUT_BSS', and gives you more flexibility in
  42    handling the required alignment of the variable.  The alignment is
  43    specified as the number of bits.
  44
  45    Try to use function `asm_output_aligned_bss' defined in file
  46    `varasm.c' when defining this macro.  */
  47 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN)   \
  48 do {                                                            \
  49   if (SIZE > 0 && (long)(SIZE) <= mips_section_threshold)       \
  50     named_section (0, ".sbss", 0);                              \
  51   else                                                          \
  52     bss_section ();                                             \
  53   ASM_OUTPUT_ALIGN (FILE, floor_log2 (ALIGN / BITS_PER_UNIT));  \
  54   last_assemble_variable_decl = DECL;                           \
  55   ASM_DECLARE_OBJECT_NAME (FILE, NAME, DECL);                   \
  56   ASM_OUTPUT_SKIP (FILE, SIZE ? SIZE : 1);                      \
  57 } while (0)
  58
  59 /* These macros generate the special .type and .size directives which
  60    are used to set the corresponding fields of the linker symbol table
  61    entries in an ELF object file under SVR4.  These macros also output
  62    the starting labels for the relevant functions/objects.  */
  63
  64 /* Write the extra assembler code needed to declare an object properly.  */
  65
  66 #undef ASM_DECLARE_OBJECT_NAME
  67 #define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL)                       \
  68   do {                                                                  \
  69     HOST_WIDE_INT size;                                                 \
  70     ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "object");                   \
  71     size_directive_output = 0;                                          \
  72     if (!flag_inhibit_size_directive && DECL_SIZE (DECL))               \
  73       {                                                                 \
  74         size_directive_output = 1;                                      \
  75         size = int_size_in_bytes (TREE_TYPE (DECL));                    \
  76         ASM_OUTPUT_SIZE_DIRECTIVE (FILE, NAME, size);                   \
  77       }                                                                 \
  78     mips_declare_object (FILE, NAME, "", ":\n", 0);                     \
  79   } while (0)
  80
  81 #undef TARGET_VERSION
  82 #if TARGET_ENDIAN_DEFAULT == 0
  83 #define TARGET_VERSION fprintf (stderr, " (MIPSel GNU/Linux with ELF)");
  84 #else
  85 #define TARGET_VERSION fprintf (stderr, " (MIPS GNU/Linux with ELF)");
  86 #endif
  87
  88 #undef MD_EXEC_PREFIX
  89 #undef MD_STARTFILE_PREFIX
  90
  91 /* Required to keep collect2.c happy */
  92 #undef OBJECT_FORMAT_COFF
  93
  94 /* If we don't set MASK_ABICALLS, we can't default to PIC.  */
  95 #undef TARGET_DEFAULT
  96 #define TARGET_DEFAULT (MASK_ABICALLS|MASK_GAS)
  97
  98 #define TARGET_OS_CPP_BUILTINS()                                \
  99     do {                                                        \
 100         builtin_define ("__gnu_linux__");                       \
 101         builtin_define ("__PIC__");                             \
 102         builtin_define ("__pic__");                             \
 103         builtin_define_std ("unix");                            \
 104         builtin_define_std ("linux");                           \
 105         builtin_assert ("system=linux");                        \
 106         /* The GNU C++ standard library requires this.  */      \
 107         if (c_dialect_cxx ())                                   \
 108           builtin_define ("_GNU_SOURCE");                       \
 109                                                                 \
 110       if (mips_abi == ABI_N32)                                  \
 111       {                                                         \
 112         builtin_define ("_ABIN32=2");                           \
 113         builtin_define ("_MIPS_SIM=_ABIN32");                   \
 114         builtin_define ("_MIPS_SZLONG=32");                     \
 115         builtin_define ("_MIPS_SZPTR=32");                      \
 116       }                                                         \
 117      else if (mips_abi == ABI_64)                               \
 118       {                                                         \
 119         builtin_define ("_ABI64=3");                            \
 120         builtin_define ("_MIPS_SIM=_ABI64");                    \
 121         builtin_define ("_MIPS_SZLONG=64");                     \
 122         builtin_define ("_MIPS_SZPTR=64");                      \
 123       }                                                         \
 124      else                                                       \
 125       {                                                         \
 126         builtin_define ("_MIPS_SIM=_MIPS_SIM_ABI32");           \
 127         builtin_define ("_MIPS_SZLONG=32");                     \
 128         builtin_define ("_MIPS_SZPTR=32");                      \
 129       }                                                         \
 130      if (TARGET_FLOAT64)                                        \
 131         builtin_define ("_MIPS_FPSET=32");                      \
 132      else                                                       \
 133         builtin_define ("_MIPS_FPSET=16");                      \
 134                                                                 \
 135      if (TARGET_INT64)                                          \
 136         builtin_define ("_MIPS_SZINT=64");                      \
 137      else                                                       \
 138         builtin_define ("_MIPS_SZINT=32");                      \
 139 } while (0)
 140
 141 #undef  SUBTARGET_CPP_SPEC
 142 #define SUBTARGET_CPP_SPEC "\
 143 %{fno-PIC:-U__PIC__ -U__pic__} %{fno-pic:-U__PIC__ -U__pic__} \
 144 %{fPIC|fPIE|fpic|fpie:-D__PIC__ -D__pic__} \
 145 %{pthread:-D_REENTRANT}"
 146
 147 /* From iris5.h */
 148 /* -G is incompatible with -KPIC which is the default, so only allow objects
 149    in the small data section if the user explicitly asks for it.  */
 150 #undef MIPS_DEFAULT_GVALUE
 151 #define MIPS_DEFAULT_GVALUE 0
 152
 153 /* Borrowed from sparc/linux.h */
 154 #undef LINK_SPEC
 155 #define LINK_SPEC \
 156  "%(endian_spec) \
 157   %{shared:-shared} \
 158   %{!shared: \
 159     %{!ibcs: \
 160       %{!static: \
 161         %{rdynamic:-export-dynamic} \
 162         %{!dynamic-linker:-dynamic-linker /lib/ld.so.1}} \
 163         %{static:-static}}}"
 164
 165 #undef SUBTARGET_ASM_SPEC
 166 #define SUBTARGET_ASM_SPEC "\
 167 %{mabi=64: -64} \
 168 %{!fno-PIC:%{!fno-pic:-KPIC}} \
 169 %{fno-PIC:-non_shared} %{fno-pic:-non_shared}"
 170
 171 #undef  SUBTARGET_ASM_DEBUGGING_SPEC
 172 #define SUBTARGET_ASM_DEBUGGING_SPEC "-g0"
 173
 174 /* The MIPS assembler has different syntax for .set. We set it to
 175    .dummy to trap any errors.  */
 176 #undef SET_ASM_OP
 177 #define SET_ASM_OP "\t.dummy\t"
 178
 179 #undef ASM_OUTPUT_DEF
 180 #define ASM_OUTPUT_DEF(FILE,LABEL1,LABEL2)                              \
 181  do {                                                                   \
 182         fputc ( '\t', FILE);                                            \
 183         assemble_name (FILE, LABEL1);                                   \
 184         fputs ( " = ", FILE);                                           \
 185         assemble_name (FILE, LABEL2);                                   \
 186         fputc ( '\n', FILE);                                            \
 187  } while (0)
 188
 189 #undef ASM_DECLARE_FUNCTION_NAME
 190 #define ASM_DECLARE_FUNCTION_NAME(STREAM, NAME, DECL)                   \
 191   do {                                                                  \
 192     if (!flag_inhibit_size_directive)                                   \
 193       {                                                                 \
 194         fputs ("\t.ent\t", STREAM);                                     \
 195         assemble_name (STREAM, NAME);                                   \
 196         putc ('\n', STREAM);                                            \
 197       }                                                                 \
 198     ASM_OUTPUT_TYPE_DIRECTIVE (STREAM, NAME, "function");               \
 199     assemble_name (STREAM, NAME);                                       \
 200     fputs (":\n", STREAM);                                              \
 201   } while (0)
 202
 203 #undef ASM_DECLARE_FUNCTION_SIZE
 204 #define ASM_DECLARE_FUNCTION_SIZE(STREAM, NAME, DECL)                   \
 205   do {                                                                  \
 206     if (!flag_inhibit_size_directive)                                   \
 207       {                                                                 \
 208         fputs ("\t.end\t", STREAM);                                     \
 209         assemble_name (STREAM, NAME);                                   \
 210         putc ('\n', STREAM);                                            \
 211       }                                                                 \
 212   } while (0)
 213
 214 /* Tell function_prologue in mips.c that we have already output the .ent/.end
 215    pseudo-ops.  */
 216 #define FUNCTION_NAME_ALREADY_DECLARED
 217
 218 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE, GLOBAL)                      \
 219   (flag_pic                                                             \
 220     ? ((GLOBAL) ? DW_EH_PE_indirect : 0) | DW_EH_PE_pcrel | DW_EH_PE_sdata4\
 221    : DW_EH_PE_absptr)
 222
 223 /* The glibc _mcount stub will save $v0 for us.  Don't mess with saving
 224    it, since ASM_OUTPUT_REG_PUSH/ASM_OUTPUT_REG_POP do not work in the
 225    presence of $gp-relative calls.  */
 226 #undef ASM_OUTPUT_REG_PUSH
 227 #undef ASM_OUTPUT_REG_POP
 228
 229 /* The current Linux binutils uses MIPS_STABS_ELF and doesn't support
 230    COFF.  */
 231 #undef SDB_DEBUGGING_INFO
 232
 233 #undef LIB_SPEC
 234 #define LIB_SPEC "\
 235 %{shared: -lc} \
 236 %{!static:-rpath-link %R/lib:%R/usr/lib} \
 237 %{!shared: %{pthread:-lpthread} \
 238   %{profile:-lc_p} %{!profile: -lc}}"