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 /* Specify predefined symbols in preprocessor.  */
 131 #undef CPP_PREDEFINES
 132 #if TARGET_ENDIAN_DEFAULT == 0
 133 #define CPP_PREDEFINES "-DMIPSEL -D_MIPSEL -Dunix -Dmips -D_mips \
 134 -DR3000 -D_R3000 -D__gnu_linux__ -Dlinux -Asystem=posix -Acpu=mips \
 135 -Amachine=mips -D__ELF__ -D__PIC__ -D__pic__"
 136 #else
 137 #define CPP_PREDEFINES "-DMIPSEB -D_MIPSEB -Dunix -Dmips -D_mips \
 138 -DR3000 -D_R3000 -D__gnu_linux__ -Dlinux -Asystem=posix -Acpu=mips \
 139 -Amachine=mips -D__ELF__ -D__PIC__ -D__pic__"
 140 #endif
 141
 142 /* We must make -mips3 do what -mlong64 used to do.  */
 143 /* ??? If no mipsX option given, but a mabi=X option is, then should set
 144    _MIPS_ISA based on the mabi=X option.  */
 145 /* ??? If no mabi=X option give, but a mipsX option is, then should set
 146    _MIPS_SIM based on the mipsX option.  */
 147 /* ??? Same for _MIPS_SZINT.  */
 148 /* ??? Same for _MIPS_SZPTR.  */
 149 #undef SUBTARGET_CPP_SPEC
 150 #define SUBTARGET_CPP_SPEC "\
 151 %{mfp32: -D_MIPS_FPSET=16} \
 152 %{mfp64: -D_MIPS_FPSET=32} \
 153 %{!mfp*: -D_MIPS_FPSET=32} \
 154 %{mips1: -D_MIPS_ISA=_MIPS_ISA_MIPS1} \
 155 %{mips2: -D_MIPS_ISA=_MIPS_ISA_MIPS2} \
 156 %{mips3: -D_MIPS_ISA=_MIPS_ISA_MIPS3} \
 157 %{mips4: -D_MIPS_ISA=_MIPS_ISA_MIPS4} \
 158 %{!mips*: -D_MIPS_ISA=_MIPS_ISA_MIPS1} \
 159 %{mabi=32: -D_MIPS_SIM=_MIPS_SIM_ABI32} \
 160 %{mabi=n32: -D_ABIN32=2 -D_MIPS_SIM=_ABIN32} \
 161 %{mabi=64: -D_ABI64=3 -D_MIPS_SIM=_ABI64} \
 162 %{!mabi*: -D_MIPS_SIM=_MIPS_SIM_ABI32}  \
 163 %{!mint64: -D_MIPS_SZINT=32}%{mint64: -D_MIPS_SZINT=64} \
 164 %{mabi=32: -D_MIPS_SZLONG=32} \
 165 %{mabi=n32: -D_MIPS_SZLONG=32} \
 166 %{mabi=64: -D_MIPS_SZLONG=64} \
 167 %{!mabi*: -D_MIPS_SZLONG=32} \
 168 %{mabi=32: -D_MIPS_SZPTR=32} \
 169 %{mabi=n32: -D_MIPS_SZPTR=32} \
 170 %{mabi=64: -D_MIPS_SZPTR=64} \
 171 %{!mabi*: -D_MIPS_SZPTR=32} \
 172 %{!mips*: -U__mips -D__mips} \
 173 %{mabi=32: -U__mips64} \
 174 %{mabi=n32: -D__mips64} \
 175 %{mabi=64: -U__mips64} \
 176 %{!mabi*: -U__mips64} \
 177 %{fno-PIC:-U__PIC__ -U__pic__} %{fno-pic:-U__PIC__ -U__pic__} \
 178 %{fPIC:-D__PIC__ -D__pic__} %{fpic:-D__PIC__ -D__pic__} \
 179 %{pthread:-D_REENTRANT}"
 180
 181 /* The GNU C++ standard library requires that these macros be defined.  */
 182 #undef CPLUSPLUS_CPP_SPEC
 183 #define CPLUSPLUS_CPP_SPEC "\
 184 -D__LANGUAGE_C_PLUS_PLUS -D_LANGUAGE_C_PLUS_PLUS \
 185 -D_GNU_SOURCE %(cpp) \
 186 "
 187
 188 /* From iris5.h */
 189 /* -G is incompatible with -KPIC which is the default, so only allow objects
 190    in the small data section if the user explicitly asks for it.  */
 191 #undef MIPS_DEFAULT_GVALUE
 192 #define MIPS_DEFAULT_GVALUE 0
 193
 194 /* Borrowed from sparc/linux.h */
 195 #undef LINK_SPEC
 196 #define LINK_SPEC \
 197  "%(endian_spec) \
 198   %{shared:-shared} \
 199   %{!shared: \
 200     %{!ibcs: \
 201       %{!static: \
 202         %{rdynamic:-export-dynamic} \
 203         %{!dynamic-linker:-dynamic-linker /lib/ld.so.1}} \
 204         %{static:-static}}}"
 205
 206
 207 #undef SUBTARGET_ASM_SPEC
 208 #define SUBTARGET_ASM_SPEC "\
 209 %{mabi=64: -64} \
 210 %{!fno-PIC:%{!fno-pic:-KPIC}} \
 211 %{fno-PIC:-non_shared} %{fno-pic:-non_shared}"
 212
 213 #undef SUBTARGET_ASM_DEBUGGING_SPEC
 214 #define SUBTARGET_ASM_DEBUGGING_SPEC "-g0"
 215
 216 /* The MIPS assembler has different syntax for .set. We set it to
 217    .dummy to trap any errors.  */
 218 #undef SET_ASM_OP
 219 #define SET_ASM_OP "\t.dummy\t"
 220
 221 #undef ASM_OUTPUT_DEF
 222 #define ASM_OUTPUT_DEF(FILE,LABEL1,LABEL2)                              \
 223  do {                                                                   \
 224         fputc ( '\t', FILE);                                            \
 225         assemble_name (FILE, LABEL1);                                   \
 226         fputs ( " = ", FILE);                                           \
 227         assemble_name (FILE, LABEL2);                                   \
 228         fputc ( '\n', FILE);                                            \
 229  } while (0)
 230
 231 #undef ASM_OUTPUT_DEFINE_LABEL_DIFFERENCE_SYMBOL
 232 #define ASM_OUTPUT_DEFINE_LABEL_DIFFERENCE_SYMBOL(FILE, SY, HI, LO)     \
 233   do {                                                                  \
 234         fputc ('\t', FILE);                                             \
 235         assemble_name (FILE, SY);                                       \
 236         fputc ('=', FILE);                                              \
 237         assemble_name (FILE, HI);                                       \
 238         fputc ('-', FILE);                                              \
 239         assemble_name (FILE, LO);                                       \
 240   } while (0)
 241
 242 #undef ASM_DECLARE_FUNCTION_NAME
 243 #define ASM_DECLARE_FUNCTION_NAME(STREAM, NAME, DECL)                   \
 244   do {                                                                  \
 245     if (!flag_inhibit_size_directive)                                   \
 246       {                                                                 \
 247         fputs ("\t.ent\t", STREAM);                                     \
 248         assemble_name (STREAM, NAME);                                   \
 249         putc ('\n', STREAM);                                            \
 250       }                                                                 \
 251     fprintf (STREAM, "\t%s\t ", TYPE_ASM_OP);                           \
 252     assemble_name (STREAM, NAME);                                       \
 253     putc (',', STREAM);                                                 \
 254     fprintf (STREAM, TYPE_OPERAND_FMT, "function");                     \
 255     putc ('\n', STREAM);                                                \
 256     assemble_name (STREAM, NAME);                                       \
 257     fputs (":\n", STREAM);                                              \
 258   } while (0)
 259
 260 #undef ASM_DECLARE_FUNCTION_SIZE
 261 #define ASM_DECLARE_FUNCTION_SIZE(STREAM, NAME, DECL)                   \
 262   do {                                                                  \
 263     if (!flag_inhibit_size_directive)                                   \
 264       {                                                                 \
 265         fputs ("\t.end\t", STREAM);                                     \
 266         assemble_name (STREAM, NAME);                                   \
 267         putc ('\n', STREAM);                                            \
 268       }                                                                 \
 269   } while (0)
 270
 271 /* Tell function_prologue in mips.c that we have already output the .ent/.end
 272    pseudo-ops.  */
 273 #define FUNCTION_NAME_ALREADY_DECLARED
 274
 275 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE, GLOBAL)                      \
 276   (flag_pic                                                             \
 277     ? ((GLOBAL) ? DW_EH_PE_indirect : 0) | DW_EH_PE_pcrel | DW_EH_PE_sdata4\
 278    : DW_EH_PE_absptr)
 279
 280 /* The glibc _mcount stub will save $v0 for us.  Don't mess with saving
 281    it, since ASM_OUTPUT_REG_PUSH/ASM_OUTPUT_REG_POP do not work in the
 282    presence of $gp-relative calls.  */
 283 #undef ASM_OUTPUT_REG_PUSH
 284 #undef ASM_OUTPUT_REG_POP
 285
 286 /* The current Linux binutils uses MIPS_STABS_ELF and doesn't support
 287    COFF.  */
 288 #undef SDB_DEBUGGING_INFO