gcc/config/alpha/osf5.h

   1 /* Definitions of target machine for GNU compiler, for DEC Alpha on
   2    Tru64 UNIX V5.1.
   3    Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998, 2000, 2001,
   4    2002, 2003, 2004, 2005, 2006, 2007, 2009, 2010
   5    Free Software Foundation, Inc.
   6    Contributed by Richard Kenner (kenner@vlsi1.ultra.nyu.edu)
   7
   8 This file is part of GCC.
   9
  10 GCC is free software; you can redistribute it and/or modify
  11 it under the terms of the GNU General Public License as published by
  12 the Free Software Foundation; either version 3, or (at your option)
  13 any later version.
  14
  15 GCC is distributed in the hope that it will be useful,
  16 but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 GNU General Public License for more details.
  19
  20 You should have received a copy of the GNU General Public License
  21 along with GCC; see the file COPYING3.  If not see
  22 <http://www.gnu.org/licenses/>.  */
  23
  24 /* As of DEC OSF/1 V4.0, as can subtract adjacent labels.  */
  25
  26 #undef TARGET_AS_CAN_SUBTRACT_LABELS
  27 #define TARGET_AS_CAN_SUBTRACT_LABELS 1
  28
  29 /* The GEM libraries for X_float are present, though not used by C.  */
  30
  31 #undef TARGET_HAS_XFLOATING_LIBS
  32 #define TARGET_HAS_XFLOATING_LIBS 1
  33
  34 /* Tru64 UNIX V5.1 uses IEEE QUAD format.  */
  35 #undef TARGET_DEFAULT
  36 #define TARGET_DEFAULT  (MASK_FPREGS | MASK_LONG_DOUBLE_128)
  37
  38 /* The linker appears to perform invalid code optimizations that result
  39    in the ldgp emitted for the exception_receiver pattern being incorrectly
  40    linked.  */
  41 #undef TARGET_LD_BUGGY_LDGP
  42 #define TARGET_LD_BUGGY_LDGP 1
  43
  44 /* Tru64 UNIX V5.1 has the float and long double forms of math functions.  */
  45 #undef TARGET_C99_FUNCTIONS
  46 #define TARGET_C99_FUNCTIONS  1
  47
  48 /* Names to predefine in the preprocessor for this target machine.  */
  49
  50 #define TARGET_OS_CPP_BUILTINS()                        \
  51     do {                                                \
  52         builtin_define_std ("unix");                    \
  53         builtin_define_std ("SYSTYPE_BSD");             \
  54         builtin_define ("_SYSTYPE_BSD");                \
  55         builtin_define ("__osf__");                     \
  56         builtin_define ("__digital__");                 \
  57         builtin_define ("__arch64__");                  \
  58         builtin_define ("_LONGLONG");                   \
  59         builtin_assert ("system=unix");                 \
  60         builtin_assert ("system=xpg4");                 \
  61         /* Tru64 UNIX V5 has a 16 byte long             \
  62            double type and requires __X_FLOAT           \
  63            to be defined for <math.h>.  */              \
  64         if (LONG_DOUBLE_TYPE_SIZE == 128)               \
  65           builtin_define ("__X_FLOAT");                 \
  66                                                         \
  67         /* Tru64 UNIX V4/V5 provide several ISO C94     \
  68            features protected by the corresponding      \
  69            __STDC_VERSION__ macro.  libstdc++ v3        \
  70            needs them as well.  */                      \
  71         if (c_dialect_cxx ())                           \
  72           builtin_define ("__STDC_VERSION__=199409L");  \
  73     } while (0)
  74
  75 /* Accept DEC C flags for multithreaded programs.  We use _PTHREAD_USE_D4
  76    instead of PTHREAD_USE_D4 since both have the same effect and the former
  77    doesn't invade the users' namespace.  */
  78
  79 #undef CPP_SPEC
  80 #define CPP_SPEC \
  81 "%{pthread|threads:-D_REENTRANT} %{threads:-D_PTHREAD_USE_D4}"
  82
  83 /* Under DEC OSF/1 V4, -p and -pg require -lprof1, and -lprof1 requires
  84    -lpdf.  */
  85
  86 #define LIB_SPEC \
  87 "%{p|pg:-lprof1%{pthread|threads:_r} -lpdf} \
  88  %{threads: -lpthreads} %{pthread|threads: -lpthread -lmach -lexc} -lc"
  89
  90 /* Pass "-G 8" to ld because Alpha's CC does.  Pass -O3 if we are
  91    optimizing, -O1 if we are not.  Pass -S to silence `weak symbol
  92    multiply defined' warnings.  Pass -shared, -non_shared or
  93    -call_shared as appropriate.  Pass -hidden_symbol so that our
  94    constructor and call-frame data structures are not accidentally
  95    overridden.  */
  96 #define LINK_SPEC  \
  97   "-G 8 %{O*:-O3} %{!O*:-O1} -S %{static:-non_shared} \
  98    %{!static:%{shared:-shared -hidden_symbol _GLOBAL_*} \
  99    %{!shared:-call_shared}} %{pg} %{taso} %{rpath*}"
 100
 101 #define STARTFILE_SPEC  \
 102   "%{!shared:%{pg:gcrt0.o%s}%{!pg:%{p:mcrt0.o%s}%{!p:crt0.o%s}}}"
 103
 104 #define ENDFILE_SPEC \
 105   "%{ffast-math|funsafe-math-optimizations:crtfastmath.o%s}"
 106
 107 #define MD_STARTFILE_PREFIX "/usr/lib/cmplrs/cc/"
 108
 109 /* In Tru64 UNIX V5.1, Compaq introduced a new assembler
 110    (/usr/lib/cmplrs/cc/adu) which currently (versions between 3.04.29 and
 111    3.04.32) breaks mips-tfile.  Passing the undocumented -oldas flag reverts
 112    to using the old assembler (/usr/lib/cmplrs/cc/as[01]).
 113
 114    It is clearly not desirable to depend on this undocumented flag, and
 115    Compaq wants -oldas to go away soon, but until they have released a
 116    new adu that works with mips-tfile, this is the only option.
 117
 118    In some versions of the DTK, the assembler driver invokes ld after
 119    assembly.  This has been fixed in current versions, but adding -c
 120    works as expected for all versions.  */
 121
 122 #define ASM_OLDAS_SPEC "-oldas -c"
 123
 124 /* In OSF/1 v3.2c, the assembler by default does not output file names which
 125    causes mips-tfile to fail.  Passing -g to the assembler fixes this problem.
 126    ??? Strictly speaking, we need -g only if the user specifies -g.  Passing
 127    it always means that we get slightly larger than necessary object files
 128    if the user does not specify -g.  If we don't pass -g, then mips-tfile
 129    will need to be fixed to work in this case.  Pass -O0 since some
 130    optimization are broken and don't help us anyway.  Pass -nocpp because
 131    there's no point in running CPP on our assembler output.  */
 132 #if ((TARGET_DEFAULT | TARGET_CPU_DEFAULT) & MASK_GAS) != 0
 133 #define ASM_SPEC "%{malpha-as:-g " ASM_OLDAS_SPEC " -nocpp %{pg} -O0}"
 134 #else
 135 #define ASM_SPEC "%{!mgas:-g " ASM_OLDAS_SPEC " -nocpp %{pg} -O0}"
 136 #endif
 137
 138 /* Specify to run a post-processor, mips-tfile after the assembler
 139    has run to stuff the ecoff debug information into the object file.
 140    This is needed because the Alpha assembler provides no way
 141    of specifying such information in the assembly file.  */
 142
 143 #if ((TARGET_DEFAULT | TARGET_CPU_DEFAULT) & MASK_GAS) != 0
 144
 145 #define ASM_FINAL_SPEC "\
 146 %{malpha-as: %{!mno-mips-tfile: \
 147         \n mips-tfile %{v*: -v} \
 148                 %{K: -I %b.o~} \
 149                 %{!K: %{save-temps: -I %b.o~}} \
 150                 %{c:%W{o*}%{!o*:-o %b.o}}%{!c:-o %U.o} \
 151                 %{,assembler:%i;:%g.s}}}"
 152
 153 #else
 154 #define ASM_FINAL_SPEC "\
 155 %{!mgas: %{!mno-mips-tfile: \
 156         \n mips-tfile %{v*: -v} \
 157                 %{K: -I %b.o~} \
 158                 %{!K: %{save-temps: -I %b.o~}} \
 159                 %{c:%W{o*}%{!o*:-o %b.o}}%{!c:-o %U.o} \
 160                 %{,assembler:%i;:%g.s}}}"
 161
 162 #endif
 163
 164 /* Indicate that we have a stamp.h to use.  */
 165 #ifndef CROSS_DIRECTORY_STRUCTURE
 166 #define HAVE_STAMP_H 1
 167 #endif
 168
 169 /* Attempt to turn on access permissions for the stack.  */
 170
 171 #define ENABLE_EXECUTE_STACK                                            \
 172 void                                                                    \
 173 __enable_execute_stack (void *addr)                                     \
 174 {                                                                       \
 175   extern int mprotect (const void *, size_t, int);                      \
 176   long size = getpagesize ();                                           \
 177   long mask = ~(size-1);                                                \
 178   char *page = (char *) (((long) addr) & mask);                         \
 179   char *end  = (char *) ((((long) (addr + TRAMPOLINE_SIZE)) & mask) + size); \
 180                                                                         \
 181   /* 7 is PROT_READ | PROT_WRITE | PROT_EXEC */                         \
 182   if (mprotect (page, end - page, 7) < 0)                               \
 183     perror ("mprotect of trampoline code");                             \
 184 }
 185
 186 /* Digital UNIX V4.0E (1091)/usr/include/sys/types.h 4.3.49.9 1997/08/14 */
 187 #define SIZE_TYPE       "long unsigned int"
 188 #define PTRDIFF_TYPE    "long int"
 189
 190 #define SIG_ATOMIC_TYPE "int"
 191
 192 #define INT8_TYPE "signed char"
 193 #define INT16_TYPE "short int"
 194 #define INT32_TYPE "int"
 195 #define INT64_TYPE "long int"
 196 #define UINT8_TYPE "unsigned char"
 197 #define UINT16_TYPE "short unsigned int"
 198 #define UINT32_TYPE "unsigned int"
 199 #define UINT64_TYPE "long unsigned int"
 200
 201 #define INT_LEAST8_TYPE "signed char"
 202 #define INT_LEAST16_TYPE "short int"
 203 #define INT_LEAST32_TYPE "int"
 204 #define INT_LEAST64_TYPE "long int"
 205 #define UINT_LEAST8_TYPE "unsigned char"
 206 #define UINT_LEAST16_TYPE "short unsigned int"
 207 #define UINT_LEAST32_TYPE "unsigned int"
 208 #define UINT_LEAST64_TYPE "long unsigned int"
 209
 210 #define INT_FAST8_TYPE "signed char"
 211 #define INT_FAST16_TYPE "int"
 212 #define INT_FAST32_TYPE "int"
 213 #define INT_FAST64_TYPE "long int"
 214 #define UINT_FAST8_TYPE "unsigned char"
 215 #define UINT_FAST16_TYPE "unsigned int"
 216 #define UINT_FAST32_TYPE "unsigned int"
 217 #define UINT_FAST64_TYPE "long unsigned int"
 218
 219 #define INTPTR_TYPE "long int"
 220 #define UINTPTR_TYPE "long unsigned int"
 221
 222 /* The linker will stick __main into the .init section.  */
 223 #define HAS_INIT_SECTION
 224 #define LD_INIT_SWITCH "-init"
 225 #define LD_FINI_SWITCH "-fini"
 226
 227 /* Select a format to encode pointers in exception handling data.  CODE
 228    is 0 for data, 1 for code labels, 2 for function pointers.  GLOBAL is
 229    true if the symbol may be affected by dynamic relocations.
 230
 231    We really ought to be using the SREL32 relocations that ECOFF has,
 232    but no version of the native assembler supports creating such things,
 233    and Compaq has no plans to rectify this.  Worse, the dynamic loader
 234    cannot handle unaligned relocations, so we have to make sure that
 235    things get padded appropriately.  */
 236 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE,GLOBAL)                            \
 237   (TARGET_GAS                                                                \
 238    ? (((GLOBAL) ? DW_EH_PE_indirect : 0) | DW_EH_PE_pcrel | DW_EH_PE_sdata4) \
 239    : DW_EH_PE_aligned)
 240
 241 /* The Tru64 UNIX assembler warns on .lcomm with SIZE 0, so use 1 in that
 242    case.  */
 243 #undef ASM_OUTPUT_LOCAL
 244 #define ASM_OUTPUT_LOCAL(FILE, NAME, SIZE,ROUNDED)      \
 245 ( fputs ("\t.lcomm ", (FILE)),                          \
 246   assemble_name ((FILE), (NAME)),                       \
 247   fprintf ((FILE), ","HOST_WIDE_INT_PRINT_UNSIGNED"\n", (SIZE) ? (SIZE) : 1))
 248
 249 /* This is how we tell the assembler that a symbol is weak.  */
 250
 251 #define ASM_OUTPUT_WEAK_ALIAS(FILE, NAME, VALUE)        \
 252   do                                                    \
 253     {                                                   \
 254       (*targetm.asm_out.globalize_label) (FILE, NAME);  \
 255       fputs ("\t.weakext\t", FILE);                     \
 256       assemble_name (FILE, NAME);                       \
 257       if (VALUE)                                        \
 258         {                                               \
 259           fputc (' ', FILE);                            \
 260           assemble_name (FILE, VALUE);                  \
 261         }                                               \
 262       fputc ('\n', FILE);                               \
 263     }                                                   \
 264   while (0)
 265
 266 #define ASM_WEAKEN_LABEL(FILE, NAME) ASM_OUTPUT_WEAK_ALIAS(FILE, NAME, 0)
 267
 268 /* The native assembler doesn't understand parenthesis.  */
 269 #define TARGET_ASM_OPEN_PAREN ""
 270 #define TARGET_ASM_CLOSE_PAREN ""
 271
 272 /* Handle #pragma weak and #pragma pack.  */
 273 #define HANDLE_SYSV_PRAGMA 1
 274
 275 /* Handle #pragma extern_prefix.  */
 276 #define TARGET_HANDLE_PRAGMA_EXTERN_PREFIX 1
 277
 278 #define MD_UNWIND_SUPPORT "config/alpha/osf5-unwind.h"