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 #undef TARGET_VERSION
  22 #if TARGET_ENDIAN_DEFAULT == 0
  23 #define TARGET_VERSION fprintf (stderr, " (MIPSel GNU/Linux with ELF)");
  24 #else
  25 #define TARGET_VERSION fprintf (stderr, " (MIPS GNU/Linux with ELF)");
  26 #endif
  27
  28 #undef MD_EXEC_PREFIX
  29 #undef MD_STARTFILE_PREFIX
  30
  31 /* Required to keep collect2.c happy */
  32 #undef OBJECT_FORMAT_COFF
  33
  34 /* If we don't set MASK_ABICALLS, we can't default to PIC. */
  35 #undef TARGET_DEFAULT
  36 #define TARGET_DEFAULT (MASK_ABICALLS|MASK_GAS)
  37
  38
  39 /* Handle #pragma weak and #pragma pack.  */
  40 #undef HANDLE_SYSV_PRAGMA
  41 #define HANDLE_SYSV_PRAGMA 1
  42
  43 /* Don't assume anything about the header files.  */
  44 #define NO_IMPLICIT_EXTERN_C
  45
  46 /* Generate calls to memcpy, etc., not bcopy, etc.  */
  47 #define TARGET_MEM_FUNCTIONS
  48
  49 /* Specify predefined symbols in preprocessor.  */
  50 #undef CPP_PREDEFINES
  51 #if TARGET_ENDIAN_DEFAULT == 0
  52 #define CPP_PREDEFINES "-DMIPSEL -D_MIPSEL -Dunix -Dmips -D_mips \
  53 -DR3000 -D_R3000 -Dlinux -Asystem=posix -Acpu=mips \
  54 -Amachine=mips -D__ELF__ -D__PIC__ -D__pic__"
  55 #else
  56 #define CPP_PREDEFINES "-DMIPSEB -D_MIPSEB -Dunix -Dmips -D_mips \
  57 -DR3000 -D_R3000 -Dlinux -Asystem=posix -Acpu=mips \
  58 -Amachine=mips -D__ELF__ -D__PIC__ -D__pic__"
  59 #endif
  60
  61 #undef SUBTARGET_CPP_SIZE_SPEC
  62 #define SUBTARGET_CPP_SIZE_SPEC "\
  63 %{mabi=32: -D__SIZE_TYPE__=unsigned\\ int -D__PTRDIFF_TYPE__=int} \
  64 %{mabi=n32: -D__SIZE_TYPE__=unsigned\\ int -D__PTRDIFF_TYPE__=int} \
  65 %{mabi=64: -D__SIZE_TYPE__=long\\ unsigned\\ int -D__PTRDIFF_TYPE__=long\\ int} \
  66 %{!mabi*: -D__SIZE_TYPE__=unsigned\\ int -D__PTRDIFF_TYPE__=int}"
  67
  68 /* We must make -mips3 do what -mlong64 used to do.  */
  69 /* ??? If no mipsX option given, but a mabi=X option is, then should set
  70    _MIPS_ISA based on the mabi=X option.  */
  71 /* ??? If no mabi=X option give, but a mipsX option is, then should set
  72    _MIPS_SIM based on the mipsX option.  */
  73 /* ??? Same for _MIPS_SZINT.  */
  74 /* ??? Same for _MIPS_SZPTR.  */
  75 /* ??? Same for __SIZE_TYPE and __PTRDIFF_TYPE.  */
  76 #undef SUBTARGET_CPP_SPEC
  77 #define SUBTARGET_CPP_SPEC "\
  78 %{mfp32: -D_MIPS_FPSET=16} \
  79 %{mfp64: -D_MIPS_FPSET=32} \
  80 %{!mfp*: -D_MIPS_FPSET=32} \
  81 %{mips1: -D_MIPS_ISA=_MIPS_ISA_MIPS1} \
  82 %{mips2: -D_MIPS_ISA=_MIPS_ISA_MIPS2} \
  83 %{mips3: -D_MIPS_ISA=_MIPS_ISA_MIPS3} \
  84 %{mips4: -D_MIPS_ISA=_MIPS_ISA_MIPS4} \
  85 %{!mips*: -D_MIPS_ISA=_MIPS_ISA_MIPS1} \
  86 %{mabi=32: -D_MIPS_SIM=_MIPS_SIM_ABI32} \
  87 %{mabi=n32: -D_ABIN32=2 -D_MIPS_SIM=_ABIN32} \
  88 %{mabi=64: -D_ABI64=3 -D_MIPS_SIM=_ABI64} \
  89 %{!mabi*: -D_MIPS_SIM=_MIPS_SIM_ABI32}  \
  90 %{!mint64: -D_MIPS_SZINT=32}%{mint64: -D_MIPS_SZINT=64} \
  91 %{mabi=32: -D_MIPS_SZLONG=32} \
  92 %{mabi=n32: -D_MIPS_SZLONG=32} \
  93 %{mabi=64: -D_MIPS_SZLONG=64} \
  94 %{!mabi*: -D_MIPS_SZLONG=32} \
  95 %{mabi=32: -D_MIPS_SZPTR=32} \
  96 %{mabi=n32: -D_MIPS_SZPTR=32} \
  97 %{mabi=64: -D_MIPS_SZPTR=64} \
  98 %{!mabi*: -D_MIPS_SZPTR=32} \
  99 %{!mips*: -U__mips -D__mips} \
 100 %{mabi=32: -U__mips64} \
 101 %{mabi=n32: -D__mips64} \
 102 %{mabi=64: -U__mips64} \
 103 %{!mabi*: -U__mips64} \
 104 %{fno-PIC:-U__PIC__ -U__pic__} %{fno-pic:-U__PIC__ -U__pic__} \
 105 %{fPIC:-D__PIC__ -D__pic__} %{fpic:-D__PIC__ -D__pic__} \
 106 %{pthread:-D_REENTRANT}"
 107
 108 /* Provide a STARTFILE_SPEC appropriate for GNU/Linux.  Here we add
 109    the GNU/Linux magical crtbegin.o file (see crtstuff.c) which
 110    provides part of the support for getting C++ file-scope static
 111    object constructed before entering `main'. */
 112
 113 #undef  STARTFILE_SPEC
 114 #define STARTFILE_SPEC \
 115   "%{!shared: \
 116      %{pg:gcrt1.o%s} %{!pg:%{p:gcrt1.o%s} %{!p:crt1.o%s}}}\
 117    crti.o%s %{!shared:crtbegin.o%s} %{shared:crtbeginS.o%s}"
 118
 119 /* Provide a ENDFILE_SPEC appropriate for GNU/Linux.  Here we tack on
 120    the GNU/Linux magical crtend.o file (see crtstuff.c) which
 121    provides part of the support for getting C++ file-scope static
 122    object constructed before entering `main', followed by a normal
 123    GNU/Linux "finalizer" file, `crtn.o'.  */
 124
 125 #undef  ENDFILE_SPEC
 126 #define ENDFILE_SPEC \
 127   "%{!shared:crtend.o%s} %{shared:crtendS.o%s} crtn.o%s"
 128
 129 /* From iris5.h */
 130 /* -G is incompatible with -KPIC which is the default, so only allow objects
 131    in the small data section if the user explicitly asks for it.  */
 132 #undef MIPS_DEFAULT_GVALUE
 133 #define MIPS_DEFAULT_GVALUE 0
 134
 135 #undef LIB_SPEC
 136 /* Taken from sparc/linux.h.  */
 137 #define LIB_SPEC \
 138   "%{shared: -lc} \
 139    %{!shared: %{mieee-fp:-lieee} %{pthread:-lpthread} \
 140      %{profile:-lc_p} %{!profile: -lc}}"
 141
 142 /* Borrowed from sparc/linux.h */
 143 #undef LINK_SPEC
 144 #define LINK_SPEC \
 145  "%(endian_spec) \
 146   %{shared:-shared} \
 147   %{!shared: \
 148     %{!ibcs: \
 149       %{!static: \
 150         %{rdynamic:-export-dynamic} \
 151         %{!dynamic-linker:-dynamic-linker /lib/ld.so.1}} \
 152         %{static:-static}}}"
 153
 154
 155 #undef SUBTARGET_ASM_SPEC
 156 #define SUBTARGET_ASM_SPEC "\
 157 %{mabi=64: -64} \
 158 %{!fno-PIC:%{!fno-pic:-KPIC}} \
 159 %{fno-PIC:-non_shared} %{fno-pic:-non_shared}"
 160
 161 /* We don't need those nonsenses.  */
 162 #undef INVOKE__main
 163 #undef CTOR_LIST_BEGIN
 164 #undef CTOR_LIST_END
 165 #undef DTOR_LIST_BEGIN
 166 #undef DTOR_LIST_END
 167
 168 /* The MIPS assembler has different syntax for .set. We set it to
 169    .dummy to trap any errors.  */
 170 #undef SET_ASM_OP
 171 #define SET_ASM_OP "\t.dummy\t"
 172
 173 /* This is how we tell the assembler that two symbols have the
 174    same value.  */
 175 #undef ASM_OUTPUT_DEF
 176 #define ASM_OUTPUT_DEF(FILE,LABEL1,LABEL2)                              \
 177   do {                                                                  \
 178         fprintf ((FILE), "\t");                                         \
 179         assemble_name (FILE, LABEL1);                                   \
 180         fprintf (FILE, "=");                                            \
 181         assemble_name (FILE, LABEL2);                                   \
 182         fprintf (FILE, "\n");                                           \
 183  } while (0)
 184
 185 #undef ASM_OUTPUT_DEFINE_LABEL_DIFFERENCE_SYMBOL
 186 #define ASM_OUTPUT_DEFINE_LABEL_DIFFERENCE_SYMBOL(FILE, SY, HI, LO)     \
 187   do {                                                                  \
 188         fputc ('\t', FILE);                                             \
 189         assemble_name (FILE, SY);                                       \
 190         fputc ('=', FILE);                                              \
 191         assemble_name (FILE, HI);                                       \
 192         fputc ('-', FILE);                                              \
 193         assemble_name (FILE, LO);                                       \
 194   } while (0)
 195
 196 #undef ASM_DECLARE_FUNCTION_NAME
 197 #define ASM_DECLARE_FUNCTION_NAME(STREAM, NAME, DECL)                   \
 198   do {                                                                  \
 199     if (!flag_inhibit_size_directive)                                   \
 200       {                                                                 \
 201         fputs ("\t.ent\t", STREAM);                                     \
 202         assemble_name (STREAM, NAME);                                   \
 203         putc ('\n', STREAM);                                            \
 204       }                                                                 \
 205     fprintf (STREAM, "\t%s\t ", TYPE_ASM_OP);                           \
 206     assemble_name (STREAM, NAME);                                       \
 207     putc (',', STREAM);                                                 \
 208     fprintf (STREAM, TYPE_OPERAND_FMT, "function");                     \
 209     putc ('\n', STREAM);                                                \
 210     assemble_name (STREAM, NAME);                                       \
 211     fputs (":\n", STREAM);                                              \
 212   } while (0)
 213
 214 #undef ASM_DECLARE_FUNCTION_SIZE
 215 #define ASM_DECLARE_FUNCTION_SIZE(STREAM, NAME, DECL)                   \
 216   do {                                                                  \
 217     if (!flag_inhibit_size_directive)                                   \
 218       {                                                                 \
 219         fputs ("\t.end\t", STREAM);                                     \
 220         assemble_name (STREAM, NAME);                                   \
 221         putc ('\n', STREAM);                                            \
 222       }                                                                 \
 223   } while (0)
 224
 225 /* Tell function_prologue in mips.c that we have already output the .ent/.end
 226    pseudo-ops.  */
 227 #define FUNCTION_NAME_ALREADY_DECLARED