gcc/config/sparc/freebsd.h

   1 /* Definitions for Sun SPARC64 running FreeBSD using the ELF format
   2    Copyright (C) 2001, 2002, 2004, 2005 Free Software Foundation, Inc.
   3    Contributed by David E. O'Brien <obrien@FreeBSD.org> and BSDi.
   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, 675 Mass Ave, Cambridge, MA 02139, USA.  */
  20
  21
  22 #undef  SUBTARGET_EXTRA_SPECS
  23 #define SUBTARGET_EXTRA_SPECS \
  24   { "fbsd_dynamic_linker", FBSD_DYNAMIC_LINKER }
  25
  26 /* FreeBSD needs the platform name (sparc64) defined.
  27    Emacs needs to know if the arch is 64 or 32-bits.  */
  28
  29 #undef  CPP_CPU64_DEFAULT_SPEC
  30 #define CPP_CPU64_DEFAULT_SPEC \
  31   "-D__sparc64__ -D__sparc_v9__ -D__sparcv9 -D__arch64__"
  32
  33 #define LINK_SPEC "%(link_arch)                                         \
  34   %{!mno-relax:%{!r:-relax}}                                            \
  35   %{p:%nconsider using `-pg' instead of `-p' with gprof(1)}                             \
  36   %{Wl,*:%*}                                                            \
  37   %{assert*} %{R*} %{rpath*} %{defsym*}                                 \
  38   %{shared:-Bshareable %{h*} %{soname*}}                                \
  39   %{symbolic:-Bsymbolic}                                                \
  40   %{!shared:                                                            \
  41     %{!static:                                                          \
  42       %{rdynamic:-export-dynamic}                                       \
  43       %{!dynamic-linker:-dynamic-linker %(fbsd_dynamic_linker) }}       \
  44     %{static:-Bstatic}}"
  45
  46
  47 /************************[  Target stuff  ]***********************************/
  48
  49 /* Define the actual types of some ANSI-mandated types.
  50    Needs to agree with <machine/ansi.h>.  GCC defaults come from c-decl.c,
  51    c-common.c, and config/<arch>/<arch>.h.  */
  52
  53 /* Earlier headers may get this wrong for FreeBSD.
  54    We use the GCC defaults instead.  */
  55 #undef WCHAR_TYPE
  56
  57 #undef  WCHAR_TYPE_SIZE
  58 #define WCHAR_TYPE_SIZE 32
  59
  60 /* Define for support of TFmode long double.
  61    SPARC ABI says that long double is 4 words.  */
  62 #undef  LONG_DOUBLE_TYPE_SIZE
  63 #define LONG_DOUBLE_TYPE_SIZE (TARGET_LONG_DOUBLE_128 ? 128 : 64)
  64
  65 /* Define this to set long double type size to use in libgcc2.c, which can
  66    not depend on target_flags.  */
  67 #if defined(__arch64__) || defined(__LONG_DOUBLE_128__)
  68 #define LIBGCC2_LONG_DOUBLE_TYPE_SIZE 128
  69 #else
  70 #define LIBGCC2_LONG_DOUBLE_TYPE_SIZE 64
  71 #endif
  72
  73 /* Definitions for 64-bit SPARC running systems with ELF. */
  74
  75 #undef  SUBTARGET_SWITCHES
  76 #define SUBTARGET_SWITCHES                                                  \
  77   {"long-double-64", -MASK_LONG_DOUBLE_128, N_("Use 64 bit long doubles") },  \
  78   {"long-double-128", MASK_LONG_DOUBLE_128, N_("Use 128 bit long doubles") },
  79
  80 #undef  TARGET_VERSION
  81 #define TARGET_VERSION fprintf (stderr, " (FreeBSD/sparc64 ELF)");
  82
  83 #define TARGET_ELF              1
  84
  85 /* XXX */
  86 /* A 64 bit v9 compiler with stack-bias,
  87    in a Medium/mid code model environment.  */
  88
  89 #undef  TARGET_DEFAULT
  90 #define TARGET_DEFAULT \
  91   (MASK_V9 + MASK_64BIT + MASK_PTR64 /* + MASK_FASTER_STRUCTS */ \
  92    + MASK_STACK_BIAS + MASK_APP_REGS + MASK_FPU \
  93    + MASK_LONG_DOUBLE_128 /* + MASK_HARD_QUAD */)
  94
  95 /* The default code model.  */
  96 #undef  SPARC_DEFAULT_CMODEL
  97 #define SPARC_DEFAULT_CMODEL    CM_MEDLOW
  98
  99 #define ENABLE_EXECUTE_STACK                                            \
 100   static int need_enable_exec_stack;                                    \
 101   static void check_enabling(void) __attribute__ ((constructor));       \
 102   static void check_enabling(void)                                      \
 103   {                                                                     \
 104     extern int sysctlbyname(const char *, void *, size_t *, void *, size_t);\
 105     int prot = 0;                                                       \
 106     size_t len = sizeof(prot);                                          \
 107                                                                         \
 108     sysctlbyname ("kern.stackprot", &prot, &len, NULL, 0);              \
 109     if (prot != 7)                                                      \
 110       need_enable_exec_stack = 1;                                       \
 111   }                                                                     \
 112   extern void __enable_execute_stack (void *);                          \
 113   void __enable_execute_stack (void *addr)                              \
 114   {                                                                     \
 115     if (!need_enable_exec_stack)                                        \
 116       return;                                                           \
 117     else {                                                              \
 118       /* 7 is PROT_READ | PROT_WRITE | PROT_EXEC */                     \
 119       if (mprotect (addr, TRAMPOLINE_SIZE, 7) < 0)                      \
 120         perror ("mprotect of trampoline code");                         \
 121     }                                                                   \
 122   }
 123
 124
 125 /************************[  Assembler stuff  ]********************************/
 126
 127 #undef  LOCAL_LABEL_PREFIX
 128 #define LOCAL_LABEL_PREFIX  "."
 129
 130 /* XXX2 */
 131 /* This is how to store into the string LABEL
 132    the symbol_ref name of an internal numbered label where
 133    PREFIX is the class of label and NUM is the number within the class.
 134    This is suitable for output with `assemble_name'.  */
 135
 136 #undef  ASM_GENERATE_INTERNAL_LABEL
 137 #define ASM_GENERATE_INTERNAL_LABEL(LABEL,PREFIX,NUM)                   \
 138   sprintf (LABEL, "*.L%s%lu", PREFIX, (unsigned long)(NUM))
 139
 140
 141 /************************[  Debugger stuff  ]*********************************/
 142
 143 /* This is the char to use for continuation (in case we need to turn
 144    continuation back on).  */
 145
 146 #undef  DBX_CONTIN_CHAR
 147 #define DBX_CONTIN_CHAR '?'
 148
 149 /* DWARF bits.  */
 150
 151 /* Follow Irix 6 and not the Dwarf2 draft in using 64-bit offsets.
 152    Obviously the Dwarf2 folks havn't tried to actually build systems
 153    with their spec.  On a 64-bit system, only 64-bit relocs become
 154    RELATIVE relocations.  */
 155
 156 /* #define DWARF_OFFSET_SIZE PTR_SIZE */
 157
 158 #undef ENDFILE_SPEC
 159 #define ENDFILE_SPEC \
 160         "%{ffast-math|funsafe-math-optimizations:crtfastmath.o%s}" \
 161         FBSD_ENDFILE_SPEC
 162
 163 /* We use GNU ld so undefine this so that attribute((init_priority)) works.  */
 164 #undef CTORS_SECTION_ASM_OP
 165 #undef DTORS_SECTION_ASM_OP