gcc/config/arm/unknown-elf.h

   1 /* Definitions for non-Linux based ARM systems using ELF
   2    Copyright (C) 1998, 1999, 2000 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 /* If you don't define HAVE_ATEXIT, and the object file format/OS/whatever
  28    does not support constructors/destructors, then gcc implements destructors
  29    by defining its own exit function, which calls the destructors.  This gcc
  30    exit function overrides the C library's exit function, and this can cause
  31    all kinds of havoc if the C library has a non-trivial exit function.  You
  32    really don't want to use the exit function in libgcc2.c.  */
  33 #define HAVE_ATEXIT
  34
  35 /* Default to using APCS-32 and software floating point.  */
  36 #ifndef TARGET_DEFAULT
  37 #define TARGET_DEFAULT  (ARM_FLAG_SOFT_FLOAT | ARM_FLAG_APCS_32 | ARM_FLAG_APCS_FRAME)
  38 #endif
  39
  40 /* Now we define the strings used to build the spec file.  */
  41 #define STARTFILE_SPEC  "crtbegin%O%s crt0%O%s"
  42
  43 #define ENDFILE_SPEC    "crtend%O%s"
  44
  45 #define USER_LABEL_PREFIX       ""
  46 #define LOCAL_LABEL_PREFIX      "."
  47
  48 #define TEXT_SECTION "          .text"
  49
  50 #define INVOKE__main
  51
  52 /* Debugging */
  53 #define DWARF_DEBUGGING_INFO
  54 #define DWARF2_DEBUGGING_INFO
  55 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
  56
  57 /* Support for Constructors and Destrcutors .  */
  58 #define READONLY_DATA_SECTION   rdata_section
  59
  60 /* A list of other sections which the compiler might be "in" at any
  61    given time.  */
  62 #define SUBTARGET_EXTRA_SECTIONS in_rdata,
  63
  64 /* A list of extra section function definitions.  */
  65 #define SUBTARGET_EXTRA_SECTION_FUNCTIONS       RDATA_SECTION_FUNCTION
  66
  67 #define RDATA_SECTION_ASM_OP    "\t.section .rodata"
  68
  69 #define RDATA_SECTION_FUNCTION                                  \
  70 void                                                            \
  71 rdata_section ()                                                \
  72 {                                                               \
  73   if (in_section != in_rdata)                                   \
  74     {                                                           \
  75       fprintf (asm_out_file, "%s\n", RDATA_SECTION_ASM_OP);     \
  76       in_section = in_rdata;                                    \
  77     }                                                           \
  78 }
  79
  80 #define CTOR_LIST_BEGIN                                 \
  81   asm (CTORS_SECTION_ASM_OP);                           \
  82   func_ptr __CTOR_LIST__[1] = { (func_ptr) (-1) }
  83
  84 #define CTOR_LIST_END                                   \
  85   asm (CTORS_SECTION_ASM_OP);                           \
  86   func_ptr __CTOR_END__[1] = { (func_ptr) 0 };
  87
  88 #define DTOR_LIST_BEGIN                                 \
  89   asm (DTORS_SECTION_ASM_OP);                           \
  90   func_ptr __DTOR_LIST__[1] = { (func_ptr) (-1) }
  91
  92 #define DTOR_LIST_END                                   \
  93   asm (DTORS_SECTION_ASM_OP);                           \
  94   func_ptr __DTOR_END__[1] = { (func_ptr) 0 };
  95
  96 /* A C statement to output something to the assembler file to switch to section
  97    NAME for object DECL which is either a FUNCTION_DECL, a VAR_DECL or
  98    NULL_TREE.  Some target formats do not support arbitrary sections.  Do not
  99    define this macro in such cases.  */
 100 #define ASM_OUTPUT_SECTION_NAME(STREAM, DECL, NAME, RELOC)              \
 101   do                                                                    \
 102     {                                                                   \
 103       if ((DECL) && TREE_CODE (DECL) == FUNCTION_DECL)                  \
 104         fprintf (STREAM, "\t.section %s,\"ax\",@progbits\n", (NAME));   \
 105       else if ((DECL) && DECL_READONLY_SECTION (DECL, RELOC))           \
 106         fprintf (STREAM, "\t.section %s,\"a\"\n", (NAME));              \
 107       else if (! strncmp (NAME, ".bss", 4))                             \
 108         fprintf (STREAM, "\t.section %s,\"aw\",@nobits\n", (NAME));     \
 109       else                                                              \
 110         fprintf (STREAM, "\t.section %s,\"aw\"\n", (NAME));             \
 111     }                                                                   \
 112   while (0)
 113
 114 /* Don't know how to order these.  UNALIGNED_WORD_ASM_OP is in
 115    dwarf2.out. */
 116 #define UNALIGNED_WORD_ASM_OP ".4byte"
 117
 118 #define ASM_OUTPUT_DWARF2_ADDR_CONST(FILE,ADDR)                  \
 119  fprintf ((FILE), "\t%s\t%s", UNALIGNED_WORD_ASM_OP, ADDR)
 120
 121 #define ASM_OUTPUT_DWARF_ADDR_CONST(FILE,RTX)                   \
 122   do                                                            \
 123     {                                                           \
 124       fprintf ((FILE), "\t%s\t", UNALIGNED_WORD_ASM_OP);        \
 125       output_addr_const ((FILE), (RTX));                        \
 126       fputc ('\n', (FILE));                                     \
 127     }                                                           \
 128   while (0)
 129
 130
 131 /* The ARM development system defines __main.  */
 132 #define NAME__MAIN "__gccmain"
 133 #define SYMBOL__MAIN __gccmain
 134
 135 /* Return a non-zero value if DECL has a section attribute.  */
 136 #define IN_NAMED_SECTION(DECL)                                          \
 137   ((TREE_CODE (DECL) == FUNCTION_DECL || TREE_CODE (DECL) == VAR_DECL)  \
 138    && DECL_SECTION_NAME (DECL) != NULL_TREE)
 139
 140 #define MAKE_DECL_ONE_ONLY(DECL) (DECL_WEAK (DECL) = 1)
 141
 142 #define UNIQUE_SECTION_P(DECL) (DECL_ONE_ONLY (DECL) || flag_data_sections)
 143
 144 #define UNIQUE_SECTION(DECL, RELOC)                                     \
 145   do                                                                    \
 146     {                                                                   \
 147       int len;                                                          \
 148       int sec;                                                          \
 149       const char * name;                                                \
 150       char * string;                                                    \
 151       char * prefix;                                                    \
 152       static char * prefixes[4][2] =                                    \
 153       {                                                                 \
 154         { ".text.",   ".gnu.linkonce.t." },                             \
 155         { ".rodata.", ".gnu.linkonce.r." },                             \
 156         { ".data.",   ".gnu.linkonce.d." },                             \
 157         { ".bss.",    ".gnu.linkonce.b." }                              \
 158       };                                                                \
 159                                                                         \
 160       if (TREE_CODE (DECL) == FUNCTION_DECL)                            \
 161         sec = 0;                                                        \
 162       else if (DECL_INITIAL (DECL) == 0                                 \
 163                || DECL_INITIAL (DECL) == error_mark_node)               \
 164         sec = 3;                                                        \
 165       else if (DECL_READONLY_SECTION (DECL, RELOC))                     \
 166         sec = 1;                                                        \
 167       else                                                              \
 168         sec = 2;                                                        \
 169                                                                         \
 170       prefix = prefixes[sec][DECL_ONE_ONLY(DECL)];                      \
 171       name   = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (DECL));         \
 172                                                                         \
 173       /* Strip off any encoding in name.  */                            \
 174       STRIP_NAME_ENCODING (name, name);                                 \
 175                                                                         \
 176       len    = strlen (name) + strlen (prefix);                         \
 177       string = alloca (len + 1);                                        \
 178                                                                         \
 179       sprintf (string, "%s%s", prefix, name);                           \
 180                                                                         \
 181       DECL_SECTION_NAME (DECL) = build_string (len, string);            \
 182     }                                                                   \
 183   while (0)
 184
 185 #undef  ASM_OUTPUT_ALIGNED_BSS
 186 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN)           \
 187   do                                                                    \
 188     {                                                                   \
 189       if (IN_NAMED_SECTION (DECL))                                      \
 190         named_section (DECL, NULL, 0);                                  \
 191       else                                                              \
 192         bss_section ();                                                 \
 193                                                                         \
 194       ASM_GLOBALIZE_LABEL (FILE, NAME);                                 \
 195                                                                         \
 196       ASM_OUTPUT_ALIGN (FILE, floor_log2 (ALIGN / BITS_PER_UNIT));      \
 197                                                                         \
 198       last_assemble_variable_decl = DECL;                               \
 199       ASM_DECLARE_OBJECT_NAME (FILE, NAME, DECL);                       \
 200       ASM_OUTPUT_SKIP (FILE, SIZE ? SIZE : 1);                          \
 201     }                                                                   \
 202   while (0)
 203
 204 #undef  ASM_OUTPUT_ALIGNED_DECL_LOCAL
 205 #define ASM_OUTPUT_ALIGNED_DECL_LOCAL(FILE, DECL, NAME, SIZE, ALIGN)    \
 206   do                                                                    \
 207     {                                                                   \
 208       if (IN_NAMED_SECTION (DECL))                                      \
 209         named_section (DECL, NULL, 0);                                  \
 210       else                                                              \
 211         bss_section ();                                                 \
 212                                                                         \
 213       ASM_OUTPUT_ALIGN (FILE, floor_log2 (ALIGN / BITS_PER_UNIT));      \
 214       ASM_OUTPUT_LABEL (FILE, NAME);                                    \
 215       fprintf (FILE, "\t.space\t%d\n", SIZE);                           \
 216     }                                                                   \
 217   while (0)
 218
 219 #ifndef CPP_APCS_PC_DEFAULT_SPEC
 220 #define CPP_APCS_PC_DEFAULT_SPEC        "-D__APCS_32__"
 221 #endif
 222
 223 #ifndef SUBTARGET_CPU_DEFAULT
 224 #define SUBTARGET_CPU_DEFAULT           TARGET_CPU_arm7tdmi
 225 #endif
 226
 227 /* Now get the routine arm-elf definitions.  */
 228 #include "elf.h"