gcc/config/arm/unknown-elf.h

   1 /* Definitions for non-Linux based ARM systems using ELF
   2    Copyright (C) 1998, 1999 Free Software Foundation, Inc.
   3    Contributed by Catherine Moore <clm@cygnus.com>
   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 this program; see the file COPYING.  If not, write to
  19 the Free Software Foundation, 59 Temple Place - Suite 330,
  20 Boston, MA 02111-1307, USA.  */
  21
  22 /* Run-time Target Specification.  */
  23 #ifndef TARGET_VERSION
  24 #define TARGET_VERSION  fputs (" (ARM/ELF non-Linux)", stderr);
  25 #endif
  26
  27 /* Default to using APCS-32 and software floating point.  */
  28 #ifndef TARGET_DEFAULT
  29 #define TARGET_DEFAULT  (ARM_FLAG_SOFT_FLOAT | ARM_FLAG_APCS_32)
  30 #endif
  31
  32 /* Now we define the strings used to build the spec file.  */
  33 #define STARTFILE_SPEC  "crtbegin%O%s crt0%O%s"
  34
  35 #define ENDFILE_SPEC    "crtend%O%s"
  36
  37 #define USER_LABEL_PREFIX       ""
  38 #define LOCAL_LABEL_PREFIX      "."
  39
  40 #define TEXT_SECTION "          .text"
  41
  42 #define INVOKE__main
  43
  44 /* Debugging */
  45 #define DWARF_DEBUGGING_INFO
  46 #define DWARF2_DEBUGGING_INFO
  47 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
  48
  49 /* Support for Constructors and Destrcutors .  */
  50 #define READONLY_DATA_SECTION   rdata_section
  51
  52 /* A list of other sections which the compiler might be "in" at any
  53    given time.  */
  54 #define SUBTARGET_EXTRA_SECTIONS in_rdata,
  55
  56 /* A list of extra section function definitions.  */
  57 #define SUBTARGET_EXTRA_SECTION_FUNCTIONS       RDATA_SECTION_FUNCTION
  58
  59 #define RDATA_SECTION_ASM_OP    "\t.section .rodata"
  60
  61 #define RDATA_SECTION_FUNCTION                                  \
  62 void                                                            \
  63 rdata_section ()                                                \
  64 {                                                               \
  65   if (in_section != in_rdata)                                   \
  66     {                                                           \
  67       fprintf (asm_out_file, "%s\n", RDATA_SECTION_ASM_OP);     \
  68       in_section = in_rdata;                                    \
  69     }                                                           \
  70 }
  71
  72 #define CTOR_LIST_BEGIN                                 \
  73 asm (CTORS_SECTION_ASM_OP);                             \
  74 func_ptr __CTOR_LIST__[1] = { (func_ptr) (-1) }
  75
  76 #define CTOR_LIST_END                                   \
  77 asm (CTORS_SECTION_ASM_OP);                             \
  78 func_ptr __CTOR_END__[1] = { (func_ptr) 0 };
  79
  80 #define DTOR_LIST_BEGIN                                 \
  81 asm (DTORS_SECTION_ASM_OP);                             \
  82 func_ptr __DTOR_LIST__[1] = { (func_ptr) (-1) }
  83
  84 #define DTOR_LIST_END                                   \
  85 asm (DTORS_SECTION_ASM_OP);                             \
  86 func_ptr __DTOR_END__[1] = { (func_ptr) 0 };
  87
  88 /* A C statement to output something to the assembler file to switch to section
  89    NAME for object DECL which is either a FUNCTION_DECL, a VAR_DECL or
  90    NULL_TREE.  Some target formats do not support arbitrary sections.  Do not
  91    define this macro in such cases.  */
  92 #define ASM_OUTPUT_SECTION_NAME(STREAM, DECL, NAME, RELOC)              \
  93   do                                                                    \
  94     {                                                                   \
  95       if ((DECL) && TREE_CODE (DECL) == FUNCTION_DECL)                  \
  96         fprintf (STREAM, "\t.section %s,\"ax\",%%progbits\n", NAME);    \
  97       else if ((DECL) && DECL_READONLY_SECTION (DECL, RELOC))           \
  98         fprintf (STREAM, "\t.section %s,\"a\"\n", NAME);                \
  99       else if (! strncmp (NAME, ".bss", 4))                             \
 100         fprintf (STREAM, "\t.section %s,\"aw\",%%nobits\n", NAME);      \
 101       else                                                              \
 102         fprintf (STREAM, "\t.section %s,\"aw\"\n", NAME);               \
 103     }                                                                   \
 104   while (0)
 105
 106 /* Don't know how to order these.  UNALIGNED_WORD_ASM_OP is in
 107    dwarf2.out. */
 108 #define UNALIGNED_WORD_ASM_OP ".4byte"
 109
 110 #define ASM_OUTPUT_DWARF2_ADDR_CONST(FILE,ADDR)                  \
 111      fprintf ((FILE), "\t%s\t%s", UNALIGNED_WORD_ASM_OP, ADDR)
 112
 113 #define ASM_OUTPUT_DWARF_ADDR_CONST(FILE,RTX)                   \
 114 do {                                                            \
 115   fprintf ((FILE), "\t%s\t", UNALIGNED_WORD_ASM_OP);            \
 116   output_addr_const ((FILE), (RTX));                            \
 117   fputc ('\n', (FILE));                                         \
 118 } while (0)
 119
 120
 121 /* The ARM development system defines __main.  */
 122 #define NAME__MAIN "__gccmain"
 123 #define SYMBOL__MAIN __gccmain
 124
 125 /* Return a non-zero value if DECL has a section attribute.  */
 126 #define IN_NAMED_SECTION(DECL)                                          \
 127   ((TREE_CODE (DECL) == FUNCTION_DECL || TREE_CODE (DECL) == VAR_DECL)  \
 128    && DECL_SECTION_NAME (DECL) != NULL_TREE)
 129
 130
 131 #define MAKE_DECL_ONE_ONLY(DECL) (DECL_WEAK (DECL) = 1)
 132
 133 #define UNIQUE_SECTION_P(DECL) (DECL_ONE_ONLY (DECL) || flag_data_sections)
 134
 135 #define UNIQUE_SECTION(DECL, RELOC)                                     \
 136   do                                                                    \
 137     {                                                                   \
 138       int len;                                                          \
 139       int sec;                                                          \
 140       char *name;                                                       \
 141       char *string;                                                     \
 142       char *prefix;                                                     \
 143       static char *prefixes[4][2] =                                     \
 144       {                                                                 \
 145         { ".text.",   ".gnu.linkonce.t." },                             \
 146         { ".rodata.", ".gnu.linkonce.r." },                             \
 147         { ".data.",   ".gnu.linkonce.d." },                             \
 148         { ".bss.",    ".gnu.linkonce.b." }                              \
 149       };                                                                \
 150                                                                         \
 151       if (TREE_CODE (DECL) == FUNCTION_DECL)                            \
 152         sec = 0;                                                        \
 153       else if (DECL_INITIAL (DECL) == 0                                 \
 154                || DECL_INITIAL (DECL) == error_mark_node)               \
 155         sec = 3;                                                        \
 156       else if (DECL_READONLY_SECTION (DECL, RELOC))                     \
 157         sec = 1;                                                        \
 158       else                                                              \
 159         sec = 2;                                                        \
 160                                                                         \
 161       prefix = prefixes[sec][DECL_ONE_ONLY(DECL)];                      \
 162       name   = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (DECL));         \
 163                                                                         \
 164       /* Strip off any encoding in name.  */                            \
 165       STRIP_NAME_ENCODING (name, name);                                 \
 166                                                                         \
 167       len    = strlen (name) + strlen (prefix);                         \
 168       string = alloca (len + 1);                                        \
 169                                                                         \
 170       sprintf (string, "%s%s", prefix, name);                           \
 171                                                                         \
 172       DECL_SECTION_NAME (DECL) = build_string (len, string);            \
 173     }                                                                   \
 174   while (0)
 175
 176 #undef  ASM_OUTPUT_ALIGNED_BSS
 177 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN)           \
 178   do                                                                    \
 179     {                                                                   \
 180       if (IN_NAMED_SECTION (DECL))                                      \
 181         named_section (DECL, NULL, 0);                                  \
 182       else                                                              \
 183         bss_section ();                                                 \
 184                                                                         \
 185       ASM_GLOBALIZE_LABEL (FILE, NAME);                                 \
 186                                                                         \
 187       ASM_OUTPUT_ALIGN (FILE, floor_log2 (ALIGN / BITS_PER_UNIT));      \
 188                                                                         \
 189       last_assemble_variable_decl = DECL;                               \
 190       ASM_DECLARE_OBJECT_NAME (FILE, NAME, DECL);                       \
 191       ASM_OUTPUT_SKIP (FILE, SIZE ? SIZE : 1);                          \
 192     }                                                                   \
 193   while (0)
 194
 195 #undef  ASM_OUTPUT_ALIGNED_DECL_LOCAL
 196 #define ASM_OUTPUT_ALIGNED_DECL_LOCAL(FILE, DECL, NAME, SIZE, ALIGN)    \
 197   do                                                                    \
 198     {                                                                   \
 199       if (IN_NAMED_SECTION (DECL))                                      \
 200         named_section (DECL, NULL, 0);                                  \
 201       else                                                              \
 202         bss_section ();                                                 \
 203                                                                         \
 204       ASM_OUTPUT_ALIGN (FILE, floor_log2 (ALIGN / BITS_PER_UNIT));      \
 205       ASM_OUTPUT_LABEL (FILE, NAME);                                    \
 206       fprintf (FILE, "\t.space\t%d\n", SIZE);                           \
 207     }                                                                   \
 208   while (0)
 209
 210 #ifndef CPP_APCS_PC_DEFAULT_SPEC
 211 #define CPP_APCS_PC_DEFAULT_SPEC        "-D__APCS_32__"
 212 #endif
 213
 214 #ifndef SUBTARGET_CPU_DEFAULT
 215 #define SUBTARGET_CPU_DEFAULT           TARGET_CPU_arm7tdmi
 216 #endif
 217
 218 /* Now get the routine arm-elf definitions.  */
 219 #include "arm/elf.h"