gcc/config/sparc/linux.h

   1 /* Definitions for SPARC running Linux-based GNU systems with ELF.
   2    Copyright (C) 1996, 1997, 1998, 1999, 2000, 2002, 2003, 2004, 2005, 2006
   3    Free Software Foundation, Inc.
   4    Contributed by Eddie C. Dost (ecd@skynet.be)
   5
   6 This file is part of GCC.
   7
   8 GCC is free software; you can redistribute it and/or modify
   9 it under the terms of the GNU General Public License as published by
  10 the Free Software Foundation; either version 2, or (at your option)
  11 any later version.
  12
  13 GCC is distributed in the hope that it will be useful,
  14 but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 GNU General Public License for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with GCC; see the file COPYING.  If not, write to
  20 the Free Software Foundation, 51 Franklin Street, Fifth Floor,
  21 Boston, MA 02110-1301, USA.  */
  22
  23 #define TARGET_OS_CPP_BUILTINS()                \
  24   do                                            \
  25     {                                           \
  26       builtin_define_std ("unix");              \
  27       builtin_define_std ("linux");             \
  28       builtin_define ("__gnu_linux__");         \
  29       builtin_assert ("system=linux");          \
  30       builtin_assert ("system=unix");           \
  31       builtin_assert ("system=posix");          \
  32       if (TARGET_LONG_DOUBLE_128)               \
  33         builtin_define ("__LONG_DOUBLE_128__"); \
  34     }                                           \
  35   while (0)
  36
  37 /* Don't assume anything about the header files.  */
  38 #define NO_IMPLICIT_EXTERN_C
  39
  40 #undef MD_EXEC_PREFIX
  41 #undef MD_STARTFILE_PREFIX
  42
  43 /* Provide a STARTFILE_SPEC appropriate for GNU/Linux.  Here we add
  44    the GNU/Linux magical crtbegin.o file (see crtstuff.c) which
  45    provides part of the support for getting C++ file-scope static
  46    object constructed before entering `main'.  */
  47
  48 #undef  STARTFILE_SPEC
  49 #if defined HAVE_LD_PIE
  50 #define STARTFILE_SPEC \
  51   "%{!shared: %{pg|p:gcrt1.o%s;pie:Scrt1.o%s;:crt1.o%s}}\
  52    crti.o%s %{static:crtbeginT.o%s;shared|pie:crtbeginS.o%s;:crtbegin.o%s}"
  53 #else
  54 #define STARTFILE_SPEC \
  55   "%{!shared: %{pg|p:gcrt1.o%s;:crt1.o%s}}\
  56    crti.o%s %{static:crtbeginT.o%s;shared|pie:crtbeginS.o%s;:crtbegin.o%s}"
  57 #endif
  58
  59 /* Provide a ENDFILE_SPEC appropriate for GNU/Linux.  Here we tack on
  60    the GNU/Linux magical crtend.o file (see crtstuff.c) which
  61    provides part of the support for getting C++ file-scope static
  62    object constructed before entering `main', followed by a normal
  63    GNU/Linux "finalizer" file, `crtn.o'.  */
  64
  65 #undef  ENDFILE_SPEC
  66 #define ENDFILE_SPEC \
  67   "%{ffast-math|funsafe-math-optimizations:crtfastmath.o%s} \
  68    %{shared|pie:crtendS.o%s;:crtend.o%s} crtn.o%s"
  69
  70 /* This is for -profile to use -lc_p instead of -lc.  */
  71 #undef  CC1_SPEC
  72 #define CC1_SPEC "%{profile:-p} \
  73 %{sun4:} %{target:} \
  74 %{mcypress:-mcpu=cypress} \
  75 %{msparclite:-mcpu=sparclite} %{mf930:-mcpu=f930} %{mf934:-mcpu=f934} \
  76 %{mv8:-mcpu=v8} %{msupersparc:-mcpu=supersparc} \
  77 "
  78
  79 /* The GNU C++ standard library requires that these macros be defined.  */
  80 #undef CPLUSPLUS_CPP_SPEC
  81 #define CPLUSPLUS_CPP_SPEC "-D_GNU_SOURCE %(cpp)"
  82
  83 #undef TARGET_VERSION
  84 #define TARGET_VERSION fprintf (stderr, " (sparc GNU/Linux with ELF)");
  85
  86 #undef SIZE_TYPE
  87 #define SIZE_TYPE "unsigned int"
  88
  89 #undef PTRDIFF_TYPE
  90 #define PTRDIFF_TYPE "int"
  91
  92 #undef WCHAR_TYPE
  93 #define WCHAR_TYPE "int"
  94
  95 #undef WCHAR_TYPE_SIZE
  96 #define WCHAR_TYPE_SIZE 32
  97
  98 #undef CPP_SUBTARGET_SPEC
  99 #define CPP_SUBTARGET_SPEC \
 100 "%{posix:-D_POSIX_SOURCE} %{pthread:-D_REENTRANT}"
 101
 102 #undef LIB_SPEC
 103 #define LIB_SPEC \
 104   "%{pthread:-lpthread} \
 105    %{shared:-lc} \
 106    %{!shared:%{mieee-fp:-lieee} %{profile:-lc_p}%{!profile:-lc}}"
 107
 108 /* Provide a LINK_SPEC appropriate for GNU/Linux.  Here we provide support
 109    for the special GCC options -static and -shared, which allow us to
 110    link things in one of these three modes by applying the appropriate
 111    combinations of options at link-time. We like to support here for
 112    as many of the other GNU linker options as possible. But I don't
 113    have the time to search for those flags. I am sure how to add
 114    support for -soname shared_object_name. H.J.
 115
 116    I took out %{v:%{!V:-V}}. It is too much :-(. They can use
 117    -Wl,-V.
 118
 119    When the -shared link option is used a final link is not being
 120    done.  */
 121
 122 /* If ELF is the default format, we should not use /lib/elf.  */
 123
 124 #define GLIBC_DYNAMIC_LINKER "/lib/ld-linux.so.2"
 125 #define UCLIBC_DYNAMIC_LINKER "/lib/ld-uClibc.so.0"
 126 #if UCLIBC_DEFAULT
 127 #define CHOOSE_DYNAMIC_LINKER(G, U) "%{mglibc:%{muclibc:%e-mglibc and -muclibc used together}" G ";:" U "}"
 128 #else
 129 #define CHOOSE_DYNAMIC_LINKER(G, U) "%{muclibc:%{mglibc:%e-mglibc and -muclibc used together}" U ";:" G "}"
 130 #endif
 131 #define LINUX_DYNAMIC_LINKER \
 132   CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKER, UCLIBC_DYNAMIC_LINKER)
 133
 134
 135 #undef  LINK_SPEC
 136 #define LINK_SPEC "-m elf32_sparc -Y P,/usr/lib %{shared:-shared} \
 137   %{!mno-relax:%{!r:-relax}} \
 138   %{!shared: \
 139     %{!ibcs: \
 140       %{!static: \
 141         %{rdynamic:-export-dynamic} \
 142         %{!dynamic-linker:-dynamic-linker " LINUX_DYNAMIC_LINKER "}} \
 143         %{static:-static}}}"
 144
 145 /* The sun bundled assembler doesn't accept -Yd, (and neither does gas).
 146    It's safe to pass -s always, even if -g is not used.  */
 147 #undef ASM_SPEC
 148 #define ASM_SPEC \
 149   "%{V} %{v:%{!V:-V}} %{!Qn:-Qy} %{n} %{T} %{Ym,*} %{Wa,*:%*} -s \
 150    %{fpic|fPIC|fpie|fPIE:-K PIC} %(asm_cpu) %(asm_relax)"
 151
 152 /* Same as sparc.h */
 153 #undef DBX_REGISTER_NUMBER
 154 #define DBX_REGISTER_NUMBER(REGNO) (REGNO)
 155
 156 #undef ASM_OUTPUT_ALIGNED_LOCAL
 157 #define ASM_OUTPUT_ALIGNED_LOCAL(FILE, NAME, SIZE, ALIGN)               \
 158 do {                                                                    \
 159   fputs ("\t.local\t", (FILE));         \
 160   assemble_name ((FILE), (NAME));                                       \
 161   putc ('\n', (FILE));                                                  \
 162   ASM_OUTPUT_ALIGNED_COMMON (FILE, NAME, SIZE, ALIGN);                  \
 163 } while (0)
 164
 165 #undef COMMON_ASM_OP
 166 #define COMMON_ASM_OP "\t.common\t"
 167
 168 #undef  LOCAL_LABEL_PREFIX
 169 #define LOCAL_LABEL_PREFIX  "."
 170
 171 /* This is how to store into the string LABEL
 172    the symbol_ref name of an internal numbered label where
 173    PREFIX is the class of label and NUM is the number within the class.
 174    This is suitable for output with `assemble_name'.  */
 175
 176 #undef  ASM_GENERATE_INTERNAL_LABEL
 177 #define ASM_GENERATE_INTERNAL_LABEL(LABEL,PREFIX,NUM)   \
 178   sprintf (LABEL, "*.L%s%ld", PREFIX, (long)(NUM))
 179
 180 \f
 181 /* Define for support of TFmode long double.
 182    SPARC ABI says that long double is 4 words.  */
 183 #define LONG_DOUBLE_TYPE_SIZE (TARGET_LONG_DOUBLE_128 ? 128 : 64)
 184
 185 /* Define this to set long double type size to use in libgcc2.c, which can
 186    not depend on target_flags.  */
 187 #ifdef __LONG_DOUBLE_128__
 188 #define LIBGCC2_LONG_DOUBLE_TYPE_SIZE 128
 189 #else
 190 #define LIBGCC2_LONG_DOUBLE_TYPE_SIZE 64
 191 #endif
 192
 193 #undef DITF_CONVERSION_LIBFUNCS
 194 #define DITF_CONVERSION_LIBFUNCS 1
 195
 196 #if defined(HAVE_LD_EH_FRAME_HDR)
 197 #define LINK_EH_SPEC "%{!static:--eh-frame-hdr} "
 198 #endif
 199 \f
 200 #ifdef HAVE_AS_TLS
 201 #undef TARGET_SUN_TLS
 202 #undef TARGET_GNU_TLS
 203 #define TARGET_SUN_TLS 0
 204 #define TARGET_GNU_TLS 1
 205 #endif
 206 \f
 207 /* Don't be different from other Linux platforms in this regard.  */
 208 #define HANDLE_PRAGMA_PACK_PUSH_POP
 209
 210 /* We use GNU ld so undefine this so that attribute((init_priority)) works.  */
 211 #undef CTORS_SECTION_ASM_OP
 212 #undef DTORS_SECTION_ASM_OP
 213
 214 /* Determine whether the entire c99 runtime is present in the
 215    runtime library.  */
 216 #define TARGET_C99_FUNCTIONS (OPTION_GLIBC)
 217
 218 #define TARGET_POSIX_IO
 219
 220 #undef LINK_GCC_C_SEQUENCE_SPEC
 221 #define LINK_GCC_C_SEQUENCE_SPEC \
 222   "%{static:--start-group} %G %L %{static:--end-group}%{!static:%G}"
 223
 224 /* Use --as-needed -lgcc_s for eh support.  */
 225 #ifdef HAVE_LD_AS_NEEDED
 226 #define USE_LD_AS_NEEDED 1
 227 #endif
 228
 229 #define MD_UNWIND_SUPPORT "config/sparc/linux-unwind.h"
 230
 231 /* Linux currently uses RMO in uniprocessor mode, which is equivalent to
 232    TMO, and TMO in multiprocessor mode.  But they reserve the right to
 233    change their minds.  */
 234 #undef SPARC_RELAXED_ORDERING
 235 #define SPARC_RELAXED_ORDERING true
 236
 237 #undef NEED_INDICATE_EXEC_STACK
 238 #define NEED_INDICATE_EXEC_STACK 1
 239
 240 #ifdef TARGET_LIBC_PROVIDES_SSP
 241 /* sparc glibc provides __stack_chk_guard in [%g7 + 0x14].  */
 242 #define TARGET_THREAD_SSP_OFFSET        0x14
 243 #endif
 244
 245 /* Define if long doubles should be mangled as 'g'.  */
 246 #define TARGET_ALTERNATE_LONG_DOUBLE_MANGLING