gcc/config/sparc/sysv4.h

   1 /* Target definitions for GNU compiler for SPARC running System V.4
   2    Copyright (C) 1991, 1992, 1995, 1996, 1997, 1998, 2000, 2002
   3    Free Software Foundation, Inc.
   4    Contributed by Ron Guilmette (rfg@monkeys.com).
   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, 59 Temple Place - Suite 330,
  21 Boston, MA 02111-1307, USA.  */
  22
  23 #ifndef TARGET_VERSION
  24 #define TARGET_VERSION fprintf (stderr, " (sparc ELF)");
  25 #endif
  26
  27 /* ??? Put back the SIZE_TYPE/PTRDIFF_TYPE definitions set by sparc.h.
  28    Why, exactly, is svr4.h messing with this?  Seems like the chip
  29    would know best.  */
  30
  31 #undef SIZE_TYPE
  32 #define SIZE_TYPE (TARGET_ARCH64 ? "long unsigned int" : "unsigned int")
  33
  34 #undef PTRDIFF_TYPE
  35 #define PTRDIFF_TYPE (TARGET_ARCH64 ? "long int" : "int")
  36
  37 /* Undefined some symbols which are defined in "svr4.h" but which are
  38    appropriate only for typical svr4 systems, but not for the specific
  39    case of svr4 running on a SPARC.  */
  40
  41 #undef INIT_SECTION_ASM_OP
  42 #undef FINI_SECTION_ASM_OP
  43 #undef READONLY_DATA_SECTION_ASM_OP
  44 #undef TYPE_OPERAND_FMT
  45 #undef PUSHSECTION_FORMAT
  46 #undef STRING_ASM_OP
  47 #undef COMMON_ASM_OP
  48 #undef SKIP_ASM_OP
  49 #undef SET_ASM_OP       /* Has no equivalent.  See ASM_OUTPUT_DEF below.  */
  50
  51 /* The native assembler can't compute differences between symbols in different
  52    sections when generating pic code, so we must put jump tables in the
  53    text section.  */
  54 /* But we now defer the tables to the end of the function, so we make
  55    this 0 to not confuse the branch shortening code.  */
  56 #define JUMP_TABLES_IN_TEXT_SECTION 0
  57
  58 /* Pass -K to the assembler when PIC.  */
  59 #undef ASM_SPEC
  60 #define ASM_SPEC \
  61   "%{v:-V} %{Qy:} %{!Qn:-Qy} %{n} %{T} %{Ym,*} %{Yd,*} %{Wa,*:%*} \
  62    %{fpic|fPIC|fpie|fPIE:-K PIC} %(asm_cpu)"
  63
  64 /* Define the names of various pseudo-op used by the SPARC/svr4 assembler.
  65    Note that many of these are different from the typical pseudo-ops used
  66    by most svr4 assemblers.  That is probably due to a (misguided?) attempt
  67    to keep the SPARC/svr4 assembler somewhat compatible with the SPARC/SunOS
  68    assembler.  */
  69
  70 #define STRING_ASM_OP           "\t.asciz\t"
  71 #define COMMON_ASM_OP           "\t.common\t"
  72 #define SKIP_ASM_OP             "\t.skip\t"
  73 #define PUSHSECTION_ASM_OP      "\t.pushsection\t"
  74 #define POPSECTION_ASM_OP       "\t.popsection"
  75
  76 /* This is the format used to print the second operand of a .type pseudo-op
  77    for the SPARC/svr4 assembler.  */
  78
  79 #define TYPE_OPERAND_FMT      "#%s"
  80
  81 /* This is the format used to print a .pushsection pseudo-op (and its operand)
  82    for the SPARC/svr4 assembler.  */
  83
  84 #define PUSHSECTION_FORMAT      "%s\"%s\"\n"
  85
  86 #undef ASM_OUTPUT_CASE_LABEL
  87 #define ASM_OUTPUT_CASE_LABEL(FILE, PREFIX, NUM, JUMPTABLE)             \
  88 do { ASM_OUTPUT_ALIGN ((FILE), Pmode == SImode ? 2 : 3);                \
  89      (*targetm.asm_out.internal_label) ((FILE), PREFIX, NUM);           \
  90    } while (0)
  91
  92 /* This is how to equate one symbol to another symbol.  The syntax used is
  93    `SYM1=SYM2'.  Note that this is different from the way equates are done
  94    with most svr4 assemblers, where the syntax is `.set SYM1,SYM2'.  */
  95
  96 #define ASM_OUTPUT_DEF(FILE,LABEL1,LABEL2)                              \
  97  do {   fprintf ((FILE), "\t");                                         \
  98         assemble_name (FILE, LABEL1);                                   \
  99         fprintf (FILE, " = ");                                          \
 100         assemble_name (FILE, LABEL2);                                   \
 101         fprintf (FILE, "\n");                                           \
 102   } while (0)
 103
 104 /* Define how the SPARC registers should be numbered for Dwarf output.
 105    The numbering provided here should be compatible with the native
 106    svr4 SDB debugger in the SPARC/svr4 reference port.  The numbering
 107    is as follows:
 108
 109    Assembly name        gcc internal regno      Dwarf regno
 110    ----------------------------------------------------------
 111    g0-g7                0-7                     0-7
 112    o0-o7                8-15                    8-15
 113    l0-l7                16-23                   16-23
 114    i0-i7                24-31                   24-31
 115    f0-f31               32-63                   40-71
 116 */
 117
 118 #define DBX_REGISTER_NUMBER(REGNO) ((REGNO) < 32 ? (REGNO) : (REGNO) + 8)
 119
 120 /* A set of symbol definitions for assembly pseudo-ops which will
 121    get us switched to various sections of interest.  These are used
 122    in all places where we simply want to switch to a section, and
 123    *not* to push the previous section name onto the assembler's
 124    section names stack (as we do often in dwarfout.c).  */
 125
 126 #define TEXT_SECTION_ASM_OP     "\t.section\t\".text\""
 127 #define DATA_SECTION_ASM_OP     "\t.section\t\".data\""
 128 #define BSS_SECTION_ASM_OP      "\t.section\t\".bss\""
 129 #define READONLY_DATA_SECTION_ASM_OP "\t.section\t\".rodata\""
 130 #define INIT_SECTION_ASM_OP     "\t.section\t\".init\""
 131 #define FINI_SECTION_ASM_OP     "\t.section\t\".fini\""
 132
 133 /* Define the pseudo-ops used to switch to the .ctors and .dtors sections.
 134
 135    Note that we want to give these sections the SHF_WRITE attribute
 136    because these sections will actually contain data (i.e. tables of
 137    addresses of functions in the current root executable or shared library
 138    file) and, in the case of a shared library, the relocatable addresses
 139    will have to be properly resolved/relocated (and then written into) by
 140    the dynamic linker when it actually attaches the given shared library
 141    to the executing process.  (Note that on SVR4, you may wish to use the
 142    `-z text' option to the ELF linker, when building a shared library, as
 143    an additional check that you are doing everything right.  But if you do
 144    use the `-z text' option when building a shared library, you will get
 145    errors unless the .ctors and .dtors sections are marked as writable
 146    via the SHF_WRITE attribute.)  */
 147
 148 #undef CTORS_SECTION_ASM_OP
 149 #define CTORS_SECTION_ASM_OP    "\t.section\t\".ctors\",#alloc,#write"
 150 #undef DTORS_SECTION_ASM_OP
 151 #define DTORS_SECTION_ASM_OP    "\t.section\t\".dtors\",#alloc,#write"
 152
 153 /* Switch into a generic section.  */
 154 #undef TARGET_ASM_NAMED_SECTION
 155 #define TARGET_ASM_NAMED_SECTION  sparc_elf_asm_named_section
 156
 157 #undef ASM_OUTPUT_ALIGNED_BSS
 158 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
 159   asm_output_aligned_bss (FILE, DECL, NAME, SIZE, ALIGN)
 160
 161 /* Override the name of the mcount profiling function.  */
 162
 163 #undef MCOUNT_FUNCTION
 164 #define MCOUNT_FUNCTION "*_mcount"