gcc/config/sol2.h

   1 /* Operating system specific defines to be used when targeting GCC for any
   2    Solaris 2 system.
   3    Copyright 2002, 2003, 2004 Free Software Foundation, Inc.
   4
   5 This file is part of GCC.
   6
   7 GCC 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 GCC 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 GCC; see the file COPYING.  If not, write to
  19 the Free Software Foundation, 51 Franklin Street, Fifth Floor,
  20 Boston, MA 02110-1301, USA.  */
  21
  22 /* We use stabs-in-elf for debugging, because that is what the native
  23    toolchain uses.  */
  24 #undef PREFERRED_DEBUGGING_TYPE
  25 #define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
  26
  27 /* Solaris 2 (at least as of 2.5.1) uses a 32-bit wchar_t.  */
  28 #undef WCHAR_TYPE
  29 #define WCHAR_TYPE "long int"
  30
  31 #undef WCHAR_TYPE_SIZE
  32 #define WCHAR_TYPE_SIZE BITS_PER_WORD
  33
  34 /* Solaris 2 uses a wint_t different from the default. This is required
  35    by the SCD 2.4.1, p. 6-83, Figure 6-66.  */
  36 #undef  WINT_TYPE
  37 #define WINT_TYPE "long int"
  38
  39 #undef  WINT_TYPE_SIZE
  40 #define WINT_TYPE_SIZE BITS_PER_WORD
  41
  42 #define TARGET_HANDLE_PRAGMA_REDEFINE_EXTNAME 1
  43
  44 /* ??? Note: in order for -compat-bsd to work fully,
  45    we must somehow arrange to fixincludes /usr/ucbinclude
  46    and put the result in $(libsubdir)/ucbinclude.  */
  47
  48 #undef CPP_SUBTARGET_SPEC
  49 #define CPP_SUBTARGET_SPEC "\
  50 %{pthreads|pthread:-D_REENTRANT -D_PTHREADS} \
  51 %{!pthreads:%{!pthread:%{threads:-D_REENTRANT -D_SOLARIS_THREADS}}} \
  52 %{compat-bsd:-iwithprefixbefore ucbinclude -I/usr/ucbinclude} \
  53 "
  54
  55 /* Names to predefine in the preprocessor for this target machine.  */
  56 #define TARGET_SUB_OS_CPP_BUILTINS()
  57 #define TARGET_OS_CPP_BUILTINS()                        \
  58     do {                                                \
  59         builtin_define_std ("unix");                    \
  60         builtin_define_std ("sun");                     \
  61         builtin_define ("__svr4__");                    \
  62         builtin_define ("__SVR4");                      \
  63         builtin_assert ("system=unix");                 \
  64         builtin_assert ("system=svr4");                 \
  65         /* For C++ we need to add some additional macro \
  66            definitions required by the C++ standard     \
  67            library.  */                                 \
  68         if (c_dialect_cxx ())                           \
  69           {                                             \
  70             builtin_define ("_XOPEN_SOURCE=500");       \
  71             builtin_define ("_LARGEFILE_SOURCE=1");     \
  72             builtin_define ("_LARGEFILE64_SOURCE=1");   \
  73             builtin_define ("__EXTENSIONS__");          \
  74           }                                             \
  75         TARGET_SUB_OS_CPP_BUILTINS();                   \
  76     } while (0)
  77
  78 /* The system headers under Solaris 2 are C++-aware since 2.0.  */
  79 #define NO_IMPLICIT_EXTERN_C
  80
  81 /* The sun bundled assembler doesn't accept -Yd, (and neither does gas).
  82    It's safe to pass -s always, even if -g is not used.  */
  83 #undef ASM_SPEC
  84 #define ASM_SPEC "\
  85 %{v:-V} %{Qy:} %{!Qn:-Qy} %{n} %{T} %{Ym,*} %{Wa,*:%*} -s \
  86 %{fpic|fpie|fPIC|fPIE:-K PIC} \
  87 %(asm_cpu) \
  88 "
  89
  90 /* We don't use the standard LIB_SPEC only because we don't yet support c++.  */
  91 #undef LIB_SPEC
  92 #define LIB_SPEC \
  93   "%{compat-bsd:-lucb -lsocket -lnsl -lelf -laio} \
  94    %{!shared:\
  95      %{!symbolic:\
  96        %{pthreads|pthread:-lpthread} \
  97        %{!pthreads:%{!pthread:%{threads:-lthread}}} \
  98        %{p|pg:-ldl} -lc}}"
  99
 100 #undef  ENDFILE_SPEC
 101 #define ENDFILE_SPEC "crtend.o%s crtn.o%s"
 102
 103 /* We don't use the standard svr4 STARTFILE_SPEC because it's wrong for us.  */
 104 #undef STARTFILE_SPEC
 105 #define STARTFILE_SPEC "%{!shared: \
 106                          %{!symbolic: \
 107                           %{p:mcrt1.o%s} \
 108                           %{!p: \
 109                             %{pg:gcrt1.o%s gmon.o%s} \
 110                             %{!pg:crt1.o%s}}}} \
 111                         crti.o%s %(startfile_arch) \
 112                         crtbegin.o%s"
 113
 114 #undef STARTFILE_ARCH32_SPEC
 115 #define STARTFILE_ARCH32_SPEC "%{ansi:values-Xc.o%s} \
 116                             %{!ansi:values-Xa.o%s}"
 117
 118 #undef STARTFILE_ARCH_SPEC
 119 #define STARTFILE_ARCH_SPEC STARTFILE_ARCH32_SPEC
 120
 121 #undef LINK_ARCH32_SPEC_BASE
 122 #define LINK_ARCH32_SPEC_BASE \
 123   "%{G:-G} \
 124    %{YP,*} \
 125    %{R*} \
 126    %{compat-bsd: \
 127      %{!YP,*:%{p|pg:-Y P,/usr/ucblib:/usr/ccs/lib/libp:/usr/lib/libp:/usr/ccs/lib:/usr/lib} \
 128              %{!p:%{!pg:-Y P,/usr/ucblib:/usr/ccs/lib:/usr/lib}}} \
 129              -R /usr/ucblib} \
 130    %{!compat-bsd: \
 131      %{!YP,*:%{p|pg:-Y P,/usr/ccs/lib/libp:/usr/lib/libp:/usr/ccs/lib:/usr/lib} \
 132              %{!p:%{!pg:-Y P,/usr/ccs/lib:/usr/lib}}}}"
 133
 134 #undef LINK_ARCH32_SPEC
 135 #define LINK_ARCH32_SPEC LINK_ARCH32_SPEC_BASE
 136
 137 #undef LINK_ARCH_SPEC
 138 #define LINK_ARCH_SPEC LINK_ARCH32_SPEC
 139
 140 /* This should be the same as in svr4.h, except with -R added.  */
 141 #undef  LINK_SPEC
 142 #define LINK_SPEC \
 143   "%{h*} %{v:-V} \
 144    %{b} \
 145    %{static:-dn -Bstatic} \
 146    %{shared:-G -dy %{!mimpure-text:-z text}} \
 147    %{symbolic:-Bsymbolic -G -dy -z text} \
 148    %(link_arch) \
 149    %{Qy:} %{!Qn:-Qy}"
 150
 151 /* The Solaris linker doesn't understand constructor priorities.  (The
 152    GNU linker does support constructor priorities, so GNU ld
 153    configuration files for Solaris override this setting.)  */
 154 #undef SUPPORTS_INIT_PRIORITY
 155 #define SUPPORTS_INIT_PRIORITY 0
 156
 157 /* This defines which switch letters take arguments.
 158    It is as in svr4.h but with -R added.  */
 159 #undef SWITCH_TAKES_ARG
 160 #define SWITCH_TAKES_ARG(CHAR) \
 161   (DEFAULT_SWITCH_TAKES_ARG(CHAR) \
 162    || (CHAR) == 'R' \
 163    || (CHAR) == 'h' \
 164    || (CHAR) == 'z')
 165
 166 #define STDC_0_IN_SYSTEM_HEADERS 1
 167 \f
 168 /*
 169  * Attempt to turn on access permissions for the stack.
 170  *
 171  * _SC_STACK_PROT is only defined for post 2.6, but we want this code
 172  * to run always.  2.6 can change the stack protection but has no way to
 173  * query it.
 174  *
 175  */
 176
 177 /* sys/mman.h is not present on some non-Solaris configurations
 178    that use sol2.h, so ENABLE_EXECUTE_STACK must use a magic
 179    number instead of the appropriate PROT_* flags.  */
 180
 181 #define ENABLE_EXECUTE_STACK                                    \
 182                                                                         \
 183 /* #define STACK_PROT_RWX (PROT_READ | PROT_WRITE | PROT_EXEC) */       \
 184                                                                         \
 185 static int need_enable_exec_stack;                                      \
 186                                                                         \
 187 static void check_enabling(void) __attribute__ ((constructor));         \
 188 static void check_enabling(void)                                        \
 189 {                                                                       \
 190   extern long sysconf(int);                                             \
 191                                                                         \
 192   int prot = (int) sysconf(515 /* _SC_STACK_PROT */);                   \
 193   if (prot != 7 /* STACK_PROT_RWX */)                                   \
 194     need_enable_exec_stack = 1;                                         \
 195 }                                                                       \
 196                                                                         \
 197 extern void __enable_execute_stack (void *);                            \
 198 void                                                                    \
 199 __enable_execute_stack (void *addr)                                     \
 200 {                                                                       \
 201   extern int mprotect(void *, size_t, int);                             \
 202   if (!need_enable_exec_stack)                                          \
 203     return;                                                             \
 204   else {                                                                \
 205     long size = getpagesize ();                                         \
 206     long mask = ~(size-1);                                              \
 207     char *page = (char *) (((long) addr) & mask);                       \
 208     char *end  = (char *) ((((long) (addr + TRAMPOLINE_SIZE)) & mask) + size); \
 209                                                                         \
 210     if (mprotect (page, end - page, 7 /* STACK_PROT_RWX */) < 0)        \
 211       perror ("mprotect of trampoline code");                           \
 212   }                                                                     \
 213 }
 214
 215 /* Support Solaris-specific format checking for cmn_err.  */
 216 #define TARGET_N_FORMAT_TYPES 1
 217 #define TARGET_FORMAT_TYPES solaris_format_types
 218
 219 /* #pragma init and #pragma fini are implemented on top of init and
 220    fini attributes.  */
 221 #define SOLARIS_ATTRIBUTE_TABLE                                         \
 222   { "init",      0, 0, true,  false,  false, NULL },                    \
 223   { "fini",      0, 0, true,  false,  false, NULL }
 224
 225 /* This is how to declare the size of a function.  For Solaris, we output
 226    any .init or .fini entries here.  */
 227 #undef ASM_DECLARE_FUNCTION_SIZE
 228 #define ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL)            \
 229   do                                                            \
 230     {                                                           \
 231       if (!flag_inhibit_size_directive)                         \
 232         ASM_OUTPUT_MEASURED_SIZE (FILE, FNAME);                 \
 233       solaris_output_init_fini (FILE, DECL);                    \
 234     }                                                           \
 235   while (0)
 236
 237 /* Register the Solaris-specific #pragma directives.  */
 238 #define REGISTER_TARGET_PRAGMAS() solaris_register_pragmas ()
 239
 240 extern GTY(()) tree solaris_pending_aligns;
 241 extern GTY(()) tree solaris_pending_inits;
 242 extern GTY(()) tree solaris_pending_finis;
 243
 244 /* Allow macro expansion in #pragma pack.  */
 245 #define HANDLE_PRAGMA_PACK_WITH_EXPANSION