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
   3    Free Software Foundation, Inc.
   4    Contributed by Ron Guilmette (rfg@monkeys.com).
   5
   6 This file is part of GNU CC.
   7
   8 GNU CC 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 GNU CC 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 GNU CC; 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 CONST_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 /* Provide a set of pre-definitions and pre-assertions appropriate for
  52    the Sparc running svr4.  __svr4__ is our extension.  */
  53
  54 #undef  CPP_PREDEFINES
  55 #define CPP_PREDEFINES \
  56 "-Dsparc -Dunix -D__svr4__ -Asystem=unix -Asystem=svr4"
  57
  58 /* The native assembler can't compute differences between symbols in different
  59    sections when generating pic code, so we must put jump tables in the
  60    text section.  */
  61 /* But we now defer the tables to the end of the function, so we make
  62    this 0 to not confuse the branch shortening code.  */
  63 #define JUMP_TABLES_IN_TEXT_SECTION 0
  64
  65 /* Pass -K to the assembler when PIC.  */
  66 #undef ASM_SPEC
  67 #define ASM_SPEC \
  68   "%{v:-V} %{Qy:} %{!Qn:-Qy} %{n} %{T} %{Ym,*} %{Yd,*} %{Wa,*:%*} \
  69    %{fpic:-K PIC} %{fPIC:-K PIC} %(asm_cpu)"
  70
  71 /* Must use data section for relocatable constants when pic.  */
  72 #undef SELECT_RTX_SECTION
  73 #define SELECT_RTX_SECTION(MODE,RTX,ALIGN)      \
  74 {                                               \
  75   if (flag_pic && symbolic_operand ((RTX), (MODE))) \
  76     data_section ();                            \
  77   else                                          \
  78     const_section ();                           \
  79 }
  80
  81 /* Define the names of various pseudo-op used by the Sparc/svr4 assembler.
  82    Note that many of these are different from the typical pseudo-ops used
  83    by most svr4 assemblers.  That is probably due to a (misguided?) attempt
  84    to keep the Sparc/svr4 assembler somewhat compatible with the Sparc/SunOS
  85    assembler.  */
  86
  87 #define STRING_ASM_OP           "\t.asciz\t"
  88 #define COMMON_ASM_OP           "\t.common\t"
  89 #define SKIP_ASM_OP             "\t.skip\t"
  90 #define PUSHSECTION_ASM_OP      "\t.pushsection\t"
  91 #define POPSECTION_ASM_OP       "\t.popsection"
  92
  93 /* This is the format used to print the second operand of a .type pseudo-op
  94    for the Sparc/svr4 assembler.  */
  95
  96 #define TYPE_OPERAND_FMT      "#%s"
  97
  98 /* This is the format used to print a .pushsection pseudo-op (and its operand)
  99    for the Sparc/svr4 assembler.  */
 100
 101 #define PUSHSECTION_FORMAT      "%s\"%s\"\n"
 102
 103 #undef ASM_OUTPUT_CASE_LABEL
 104 #define ASM_OUTPUT_CASE_LABEL(FILE, PREFIX, NUM, JUMPTABLE)             \
 105 do { ASM_OUTPUT_ALIGN ((FILE), Pmode == SImode ? 2 : 3);                \
 106      ASM_OUTPUT_INTERNAL_LABEL ((FILE), PREFIX, NUM);                   \
 107    } while (0)
 108
 109 /* This is how to equate one symbol to another symbol.  The syntax used is
 110    `SYM1=SYM2'.  Note that this is different from the way equates are done
 111    with most svr4 assemblers, where the syntax is `.set SYM1,SYM2'.  */
 112
 113 #define ASM_OUTPUT_DEF(FILE,LABEL1,LABEL2)                              \
 114  do {   fprintf ((FILE), "\t");                                         \
 115         assemble_name (FILE, LABEL1);                                   \
 116         fprintf (FILE, " = ");                                          \
 117         assemble_name (FILE, LABEL2);                                   \
 118         fprintf (FILE, "\n");                                           \
 119   } while (0)
 120
 121 /* Define how the Sparc registers should be numbered for Dwarf output.
 122    The numbering provided here should be compatible with the native
 123    svr4 SDB debugger in the Sparc/svr4 reference port.  The numbering
 124    is as follows:
 125
 126    Assembly name        gcc internal regno      Dwarf regno
 127    ----------------------------------------------------------
 128    g0-g7                0-7                     0-7
 129    o0-o7                8-15                    8-15
 130    l0-l7                16-23                   16-23
 131    i0-i7                24-31                   24-31
 132    f0-f31               32-63                   40-71
 133 */
 134
 135 #define DBX_REGISTER_NUMBER(REGNO) ((REGNO) < 32 ? (REGNO) : (REGNO) + 8)
 136
 137 /* A set of symbol definitions for assembly pseudo-ops which will
 138    get us switched to various sections of interest.  These are used
 139    in all places where we simply want to switch to a section, and
 140    *not* to push the previous section name onto the assembler's
 141    section names stack (as we do often in dwarfout.c).  */
 142
 143 #define TEXT_SECTION_ASM_OP     "\t.section\t\".text\""
 144 #define DATA_SECTION_ASM_OP     "\t.section\t\".data\""
 145 #define BSS_SECTION_ASM_OP      "\t.section\t\".bss\""
 146 #define CONST_SECTION_ASM_OP    "\t.section\t\".rodata\""
 147 #define INIT_SECTION_ASM_OP     "\t.section\t\".init\""
 148 #define FINI_SECTION_ASM_OP     "\t.section\t\".fini\""
 149
 150 /* Define the pseudo-ops used to switch to the .ctors and .dtors sections.
 151
 152    Note that we want to give these sections the SHF_WRITE attribute
 153    because these sections will actually contain data (i.e. tables of
 154    addresses of functions in the current root executable or shared library
 155    file) and, in the case of a shared library, the relocatable addresses
 156    will have to be properly resolved/relocated (and then written into) by
 157    the dynamic linker when it actually attaches the given shared library
 158    to the executing process.  (Note that on SVR4, you may wish to use the
 159    `-z text' option to the ELF linker, when building a shared library, as
 160    an additional check that you are doing everything right.  But if you do
 161    use the `-z text' option when building a shared library, you will get
 162    errors unless the .ctors and .dtors sections are marked as writable
 163    via the SHF_WRITE attribute.)  */
 164
 165 #undef CTORS_SECTION_ASM_OP
 166 #define CTORS_SECTION_ASM_OP    "\t.section\t\".ctors\",#alloc,#write"
 167 #undef DTORS_SECTION_ASM_OP
 168 #define DTORS_SECTION_ASM_OP    "\t.section\t\".dtors\",#alloc,#write"
 169
 170 /* Switch into a generic section.  */
 171 #undef TARGET_ASM_NAMED_SECTION
 172 #define TARGET_ASM_NAMED_SECTION  sparc_elf_asm_named_section
 173
 174 /* A C statement (sans semicolon) to output to the stdio stream
 175    FILE the assembler definition of uninitialized global DECL named
 176    NAME whose size is SIZE bytes and alignment is ALIGN bytes.
 177    Try to use asm_output_aligned_bss to implement this macro.  */
 178
 179 #undef ASM_OUTPUT_ALIGNED_BSS
 180 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
 181   asm_output_aligned_bss (FILE, DECL, NAME, SIZE, ALIGN)
 182
 183 /* Override the name of the mcount profiling function.  */
 184
 185 #undef MCOUNT_FUNCTION
 186 #define MCOUNT_FUNCTION "*_mcount"