gcc/config/sparc/freebsd.h

   1 /* Definitions for Sun SPARC64 running FreeBSD using the ELF format
   2    Copyright (C) 2001, 2002 Free Software Foundation, Inc.
   3    Contributed by David E. O'Brien <obrien@FreeBSD.org> and BSDi.
   4
   5 This file is part of GNU CC.
   6
   7 GNU CC 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 GNU CC 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 GNU CC; see the file COPYING.  If not, write to
  19 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
  20
  21 /* FreeBSD needs the platform name (sparc64) defined.
  22    Emacs needs to know if the arch is 64 or 32-bits.  */
  23
  24 #undef  CPP_CPU64_DEFAULT_SPEC
  25 #define CPP_CPU64_DEFAULT_SPEC "-D__sparc64__ -D__sparc_v9__ -D__arch64__"
  26
  27 /* Because we include sparc/sysv4.h.  */
  28 #undef  CPP_PREDEFINES
  29 #define CPP_PREDEFINES FBSD_CPP_PREDEFINES
  30
  31 #define LINK_SPEC "%(link_arch)                                         \
  32   %{!mno-relax:%{!r:-relax}}                                            \
  33   %{p:%nconsider using `-pg' instead of `-p' with gprof(1)}                             \
  34   %{Wl,*:%*}                                                            \
  35   %{assert*} %{R*} %{rpath*} %{defsym*}                                 \
  36   %{shared:-Bshareable %{h*} %{soname*}}                                \
  37   %{symbolic:-Bsymbolic}                                                \
  38   %{!shared:                                                            \
  39     %{!static:                                                          \
  40       %{rdynamic:-export-dynamic}                                       \
  41       %{!dynamic-linker:-dynamic-linker /usr/libexec/ld-elf.so.1}}      \
  42     %{static:-Bstatic}}"
  43
  44
  45 /************************[  Target stuff  ]***********************************/
  46
  47 /* Define the actual types of some ANSI-mandated types.
  48    Needs to agree with <machine/ansi.h>.  GCC defaults come from c-decl.c,
  49    c-common.c, and config/<arch>/<arch>.h.  */
  50
  51 /* Earlier headers may get this wrong for FreeBSD.
  52    We use the GCC defaults instead.  */
  53 #undef WCHAR_TYPE
  54
  55 #undef  WCHAR_TYPE_SIZE
  56 #define WCHAR_TYPE_SIZE 32
  57
  58 /* Define for support of TFmode long double.
  59    SPARC ABI says that long double is 4 words.  */
  60 #undef  LONG_DOUBLE_TYPE_SIZE
  61 #define LONG_DOUBLE_TYPE_SIZE (TARGET_LONG_DOUBLE_128 ? 128 : 64)
  62
  63 /* Constant which presents upper bound of the above value.  */
  64 #undef  MAX_LONG_DOUBLE_TYPE_SIZE
  65 #define MAX_LONG_DOUBLE_TYPE_SIZE 128
  66
  67 /* Define this to set long double type size to use in libgcc2.c, which can
  68    not depend on target_flags.  */
  69 #if defined(__arch64__) || defined(__LONG_DOUBLE_128__)
  70 #define LIBGCC2_LONG_DOUBLE_TYPE_SIZE 128
  71 #else
  72 #define LIBGCC2_LONG_DOUBLE_TYPE_SIZE 64
  73 #endif
  74
  75 /* Definitions for 64-bit SPARC running systems with ELF. */
  76
  77 #undef  SUBTARGET_SWITCHES
  78 #define SUBTARGET_SWITCHES                                                  \
  79   {"long-double-64", -MASK_LONG_DOUBLE_128, N_("Use 64 bit long doubles") },  \
  80   {"long-double-128", MASK_LONG_DOUBLE_128, N_("Use 128 bit long doubles") },
  81
  82 #undef  TARGET_VERSION
  83 #define TARGET_VERSION fprintf (stderr, " (FreeBSD/sparc64 ELF)");
  84
  85 #define TARGET_ELF              1
  86
  87 /* XXX */
  88 /* A 64 bit v9 compiler with stack-bias,
  89    in a Medium/mid code model environment.  */
  90
  91 #undef  TARGET_DEFAULT
  92 #define TARGET_DEFAULT \
  93   (MASK_V9 + MASK_64BIT + MASK_PTR64 /* + MASK_FASTER_STRUCTS */ \
  94    + MASK_STACK_BIAS + MASK_APP_REGS + MASK_FPU \
  95    + MASK_LONG_DOUBLE_128 /* + MASK_HARD_QUAD */)
  96
  97 /* The default code model.  */
  98 #undef  SPARC_DEFAULT_CMODEL
  99 #define SPARC_DEFAULT_CMODEL    CM_MEDLOW
 100
 101 #define TRANSFER_FROM_TRAMPOLINE                                        \
 102   static int need_enable_exec_stack;                                    \
 103   static void check_enabling(void) __attribute__ ((constructor));       \
 104   static void check_enabling(void)                                      \
 105   {                                                                     \
 106     extern int sysctlbyname(const char *, void *, size_t *, void *, size_t);\
 107     int prot = 0;                                                       \
 108     size_t len = sizeof(prot);                                          \
 109                                                                         \
 110     sysctlbyname ("kern.stackprot", &prot, &len, NULL, 0);              \
 111     if (prot != 7)                                                      \
 112       need_enable_exec_stack = 1;                                       \
 113   }                                                                     \
 114   extern void __enable_execute_stack (void *);                          \
 115   void __enable_execute_stack (void *addr)                              \
 116   {                                                                     \
 117     if (!need_enable_exec_stack)                                        \
 118       return;                                                           \
 119     else {                                                              \
 120       /* 7 is PROT_READ | PROT_WRITE | PROT_EXEC */                     \
 121       if (mprotect (addr, TRAMPOLINE_SIZE, 7) < 0)                      \
 122         perror ("mprotect of trampoline code");                         \
 123     }                                                                   \
 124   }
 125
 126
 127 /************************[  Assembler stuff  ]********************************/
 128
 129 #undef  LOCAL_LABEL_PREFIX
 130 #define LOCAL_LABEL_PREFIX  "."
 131
 132 /* XXX2 */
 133 /* This is how to output a reference to an internal numbered label where
 134    PREFIX is the class of label and NUM is the number within the class.  */
 135
 136 #undef  ASM_OUTPUT_INTERNAL_LABELREF
 137 #define ASM_OUTPUT_INTERNAL_LABELREF(FILE,PREFIX,NUM)                   \
 138   fprintf (FILE, ".L%s%d", PREFIX, NUM)
 139
 140 /* XXX2 */
 141 /* This is how to store into the string LABEL
 142    the symbol_ref name of an internal numbered label where
 143    PREFIX is the class of label and NUM is the number within the class.
 144    This is suitable for output with `assemble_name'.  */
 145
 146 #undef  ASM_GENERATE_INTERNAL_LABEL
 147 #define ASM_GENERATE_INTERNAL_LABEL(LABEL,PREFIX,NUM)                   \
 148   sprintf (LABEL, "*.L%s%d", PREFIX, NUM)
 149
 150
 151 /************************[  Debugger stuff  ]*********************************/
 152
 153 /* This is the char to use for continuation (in case we need to turn
 154    continuation back on).  */
 155
 156 #undef  DBX_CONTIN_CHAR
 157 #define DBX_CONTIN_CHAR '?'
 158
 159 /* DWARF bits.  */
 160
 161 /* Follow Irix 6 and not the Dwarf2 draft in using 64-bit offsets.
 162    Obviously the Dwarf2 folks havn't tried to actually build systems
 163    with their spec.  On a 64-bit system, only 64-bit relocs become
 164    RELATIVE relocations.  */
 165
 166 /* #define DWARF_OFFSET_SIZE PTR_SIZE */
 167
 168 #undef ENDFILE_SPEC
 169 #define ENDFILE_SPEC \
 170         "%{ffast-math|funsafe-math-optimizations:crtfastmath.o%s}" \
 171         FBSD_ENDFILE_SPEC
 172
 173 /* We use GNU ld so undefine this so that attribute((init_priority)) works.  */
 174 #undef CTORS_SECTION_ASM_OP
 175 #undef DTORS_SECTION_ASM_OP