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 #define TARGET_ASM_UNIQUE_SECTION  mips_unique_section
  92
  93 /* A list of other sections which the compiler might be "in" at any
  94    given time.  */
  95 #undef EXTRA_SECTIONS
  96 #define EXTRA_SECTIONS in_sdata, in_sbss
  97
  98 #undef EXTRA_SECTION_FUNCTIONS
  99 #define EXTRA_SECTION_FUNCTIONS                                         \
 100   SECTION_FUNCTION_TEMPLATE(sdata_section, in_sdata, SDATA_SECTION_ASM_OP) \
 101   SECTION_FUNCTION_TEMPLATE(sbss_section, in_sbss, SBSS_SECTION_ASM_OP)
 102
 103 #define SECTION_FUNCTION_TEMPLATE(FN, ENUM, OP)                 \
 104 void FN ()                                                      \
 105 {                                                               \
 106   if (in_section != ENUM)                                       \
 107     {                                                           \
 108       fprintf (asm_out_file, "%s\n", OP);                       \
 109       in_section = ENUM;                                        \
 110     }                                                           \
 111 }
 112
 113 #undef TARGET_VERSION
 114 #if TARGET_ENDIAN_DEFAULT == 0
 115 #define TARGET_VERSION fprintf (stderr, " (MIPSel GNU/Linux with ELF)");
 116 #else
 117 #define TARGET_VERSION fprintf (stderr, " (MIPS GNU/Linux with ELF)");
 118 #endif
 119
 120 #undef MD_EXEC_PREFIX
 121 #undef MD_STARTFILE_PREFIX
 122
 123 /* Required to keep collect2.c happy */
 124 #undef OBJECT_FORMAT_COFF
 125
 126 /* If we don't set MASK_ABICALLS, we can't default to PIC.  */
 127 #undef TARGET_DEFAULT
 128 #define TARGET_DEFAULT (MASK_ABICALLS|MASK_GAS)
 129
 130 #define TARGET_OS_CPP_BUILTINS()                                \
 131     do {                                                        \
 132         builtin_define ("__gnu_linux__");                       \
 133         builtin_define ("__ELF__");                             \
 134         builtin_define ("__PIC__");                             \
 135         builtin_define ("__pic__");                             \
 136         builtin_define_std ("unix");                            \
 137         builtin_define_std ("linux");                           \
 138         builtin_assert ("system=linux");                        \
 139         /* The GNU C++ standard library requires this.  */      \
 140         if (c_language = clk_cplusplus)                         \
 141           builtin_define ("_GNU_SOURCE");                       \
 142                                                                 \
 143       if (mips_abi == ABI_N32)                                  \
 144       {                                                         \
 145         builtin_define ("_ABIN32=2");                           \
 146         builtin_define ("_MIPS_SIM=_ABIN32");                   \
 147         builtin_define ("_MIPS_SZLONG=32");                     \
 148         builtin_define ("_MIPS_SZPTR=32");                      \
 149       }                                                         \
 150      else if (mips_abi == ABI_64)                               \
 151       {                                                         \
 152         builtin_define ("_ABI64=3");                            \
 153         builtin_define ("_MIPS_SIM=_ABI64");                    \
 154         builtin_define ("_MIPS_SZLONG=64");                     \
 155         builtin_define ("_MIPS_SZPTR=64");                      \
 156       }                                                         \
 157      else                                                       \
 158       {                                                         \
 159         builtin_define ("_MIPS_SIM=_MIPS_SIM_ABI32");           \
 160         builtin_define ("_MIPS_SZLONG=32");                     \
 161         builtin_define ("_MIPS_SZPTR=32");                      \
 162       }                                                         \
 163      if (TARGET_FLOAT64)                                        \
 164         builtin_define ("_MIPS_FPSET=32");                      \
 165      else                                                       \
 166         builtin_define ("_MIPS_FPSET=16");                      \
 167                                                                 \
 168      if (TARGET_INT64)                                          \
 169         builtin_define ("_MIPS_SZINT=64");                      \
 170      else                                                       \
 171         builtin_define ("_MIPS_SZINT=32");                      \
 172 } while (0)
 173
 174 #define SUBTARGET_CPP_SPEC "\
 175 %{fno-PIC:-U__PIC__ -U__pic__} %{fno-pic:-U__PIC__ -U__pic__} \
 176 %{fPIC:-D__PIC__ -D__pic__} %{fpic:-D__PIC__ -D__pic__} \
 177 %{pthread:-D_REENTRANT}"
 178
 179 /* From iris5.h */
 180 /* -G is incompatible with -KPIC which is the default, so only allow objects
 181    in the small data section if the user explicitly asks for it.  */
 182 #undef MIPS_DEFAULT_GVALUE
 183 #define MIPS_DEFAULT_GVALUE 0
 184
 185 /* Borrowed from sparc/linux.h */
 186 #undef LINK_SPEC
 187 #define LINK_SPEC \
 188  "%(endian_spec) \
 189   %{shared:-shared} \
 190   %{!shared: \
 191     %{!ibcs: \
 192       %{!static: \
 193         %{rdynamic:-export-dynamic} \
 194         %{!dynamic-linker:-dynamic-linker /lib/ld.so.1}} \
 195         %{static:-static}}}"
 196
 197
 198 #undef SUBTARGET_ASM_SPEC
 199 #define SUBTARGET_ASM_SPEC "\
 200 %{mabi=64: -64} \
 201 %{!fno-PIC:%{!fno-pic:-KPIC}} \
 202 %{fno-PIC:-non_shared} %{fno-pic:-non_shared}"
 203
 204 #undef SUBTARGET_ASM_DEBUGGING_SPEC
 205 #define SUBTARGET_ASM_DEBUGGING_SPEC "-g0"
 206
 207 /* The MIPS assembler has different syntax for .set. We set it to
 208    .dummy to trap any errors.  */
 209 #undef SET_ASM_OP
 210 #define SET_ASM_OP "\t.dummy\t"
 211
 212 #undef ASM_OUTPUT_DEF
 213 #define ASM_OUTPUT_DEF(FILE,LABEL1,LABEL2)                              \
 214  do {                                                                   \
 215         fputc ( '\t', FILE);                                            \
 216         assemble_name (FILE, LABEL1);                                   \
 217         fputs ( " = ", FILE);                                           \
 218         assemble_name (FILE, LABEL2);                                   \
 219         fputc ( '\n', FILE);                                            \
 220  } while (0)
 221
 222 #undef ASM_OUTPUT_DEFINE_LABEL_DIFFERENCE_SYMBOL
 223 #define ASM_OUTPUT_DEFINE_LABEL_DIFFERENCE_SYMBOL(FILE, SY, HI, LO)     \
 224   do {                                                                  \
 225         fputc ('\t', FILE);                                             \
 226         assemble_name (FILE, SY);                                       \
 227         fputc ('=', FILE);                                              \
 228         assemble_name (FILE, HI);                                       \
 229         fputc ('-', FILE);                                              \
 230         assemble_name (FILE, LO);                                       \
 231   } while (0)
 232
 233 #undef ASM_DECLARE_FUNCTION_NAME
 234 #define ASM_DECLARE_FUNCTION_NAME(STREAM, NAME, DECL)                   \
 235   do {                                                                  \
 236     if (!flag_inhibit_size_directive)                                   \
 237       {                                                                 \
 238         fputs ("\t.ent\t", STREAM);                                     \
 239         assemble_name (STREAM, NAME);                                   \
 240         putc ('\n', STREAM);                                            \
 241       }                                                                 \
 242     fprintf (STREAM, "\t%s\t ", TYPE_ASM_OP);                           \
 243     assemble_name (STREAM, NAME);                                       \
 244     putc (',', STREAM);                                                 \
 245     fprintf (STREAM, TYPE_OPERAND_FMT, "function");                     \
 246     putc ('\n', STREAM);                                                \
 247     assemble_name (STREAM, NAME);                                       \
 248     fputs (":\n", STREAM);                                              \
 249   } while (0)
 250
 251 #undef ASM_DECLARE_FUNCTION_SIZE
 252 #define ASM_DECLARE_FUNCTION_SIZE(STREAM, NAME, DECL)                   \
 253   do {                                                                  \
 254     if (!flag_inhibit_size_directive)                                   \
 255       {                                                                 \
 256         fputs ("\t.end\t", STREAM);                                     \
 257         assemble_name (STREAM, NAME);                                   \
 258         putc ('\n', STREAM);                                            \
 259       }                                                                 \
 260   } while (0)
 261
 262 /* Tell function_prologue in mips.c that we have already output the .ent/.end
 263    pseudo-ops.  */
 264 #define FUNCTION_NAME_ALREADY_DECLARED
 265
 266 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE, GLOBAL)                      \
 267   (flag_pic                                                             \
 268     ? ((GLOBAL) ? DW_EH_PE_indirect : 0) | DW_EH_PE_pcrel | DW_EH_PE_sdata4\
 269    : DW_EH_PE_absptr)
 270
 271 /* The glibc _mcount stub will save $v0 for us.  Don't mess with saving
 272    it, since ASM_OUTPUT_REG_PUSH/ASM_OUTPUT_REG_POP do not work in the
 273    presence of $gp-relative calls.  */
 274 #undef ASM_OUTPUT_REG_PUSH
 275 #undef ASM_OUTPUT_REG_POP
 276
 277 /* The current Linux binutils uses MIPS_STABS_ELF and doesn't support
 278    COFF.  */
 279 #undef SDB_DEBUGGING_INFO