gas/config/tc-arm.h

   1 /* This file is tc-arm.h
   2    Copyright 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001
   3    Free Software Foundation, Inc.
   4    Contributed by Richard Earnshaw (rwe@pegasus.esprit.ec.org)
   5         Modified by David Taylor (dtaylor@armltd.co.uk)
   6
   7    This file is part of GAS, the GNU Assembler.
   8
   9    GAS is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 2, or (at your option)
  12    any later version.
  13
  14    GAS is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with GAS; see the file COPYING.  If not, write to the Free
  21    Software Foundation, 59 Temple Place - Suite 330, Boston, MA
  22    02111-1307, USA.  */
  23
  24 #define TC_ARM 1
  25
  26 #ifndef TARGET_BYTES_BIG_ENDIAN
  27 #define TARGET_BYTES_BIG_ENDIAN 0
  28 #endif
  29
  30 #define WORKING_DOT_WORD
  31
  32 #define COFF_MAGIC      ARMMAGIC
  33 #define TARGET_ARCH     bfd_arch_arm
  34
  35 #define AOUT_MACHTYPE   0
  36
  37 #define DIFF_EXPR_OK
  38
  39 #ifdef  LITTLE_ENDIAN
  40 #undef  LITTLE_ENDIAN
  41 #endif
  42
  43 #ifdef  BIG_ENDIAN
  44 #undef  BIG_ENDIAN
  45 #endif
  46
  47 #define LITTLE_ENDIAN   1234
  48 #define BIG_ENDIAN      4321
  49
  50 #if defined OBJ_AOUT
  51 #if defined TE_RISCIX
  52 # define TARGET_FORMAT "a.out-riscix"
  53 #elif defined TE_LINUX
  54 # define ARM_BI_ENDIAN
  55 # define TARGET_FORMAT "a.out-arm-linux"
  56 #elif defined TE_NetBSD
  57 # define TARGET_FORMAT "a.out-arm-netbsd"
  58 #else
  59 # define ARM_BI_ENDIAN
  60 # define TARGET_FORMAT \
  61   (target_big_endian ? "a.out-arm-big" : "a.out-arm-little")
  62 #endif
  63 #endif /* OBJ_AOUT */
  64
  65 #ifdef OBJ_AIF
  66 #define TARGET_FORMAT "aif"
  67 #endif
  68
  69 #if defined OBJ_COFF || defined OBJ_ELF
  70 # define ARM_BI_ENDIAN
  71
  72 # define TC_VALIDATE_FIX(fixP, segType, Label) \
  73      if (arm_validate_fix (fixP)) add_symbolP = fixP->fx_addsy
  74   extern boolean arm_validate_fix PARAMS ((struct fix *));
  75 #endif
  76
  77 #ifdef OBJ_COFF
  78 # if defined TE_PE
  79 #  define TC_FORCE_RELOCATION(x) ((x)->fx_r_type == BFD_RELOC_RVA)
  80 #   ifdef TE_EPOC
  81 #    define TARGET_FORMAT (target_big_endian ? "epoc-pe-arm-big" : "epoc-pe-arm-little")
  82 #   else
  83 #    define TARGET_FORMAT (target_big_endian ? "pe-arm-big" : "pe-arm-little")
  84 #   endif
  85 # else
  86 #  define TARGET_FORMAT (target_big_endian ? "coff-arm-big" : "coff-arm-little")
  87 # endif
  88 #endif
  89
  90 #ifdef OBJ_ELF
  91 # define TARGET_FORMAT elf32_arm_target_format()
  92   extern const char * elf32_arm_target_format PARAMS ((void));
  93
  94 # define TC_FORCE_RELOCATION(fixp) arm_force_relocation (fixp)
  95   extern int arm_force_relocation PARAMS ((struct fix *));
  96 #endif
  97
  98 #define md_convert_frag(b, s, f) {as_fatal (_("arm convert_frag\n"));}
  99
 100 #define md_cleanup() arm_cleanup ()
 101  extern void arm_cleanup PARAMS ((void));
 102
 103 #define md_start_line_hook() arm_start_line_hook ()
 104  extern void arm_start_line_hook PARAMS ((void));
 105
 106 #define tc_frob_label(S) arm_frob_label (S)
 107  extern void arm_frob_label PARAMS ((symbolS *));
 108
 109 /* We also need to mark assembler created symbols:  */
 110 #define tc_frob_fake_label(S) arm_frob_label (S)
 111
 112 /* NOTE: The fake label creation in stabs.c:s_stab_generic() has
 113    deliberately not been updated to mark assembler created stabs
 114    symbols as Thumb.  */
 115
 116 #define TC_FIX_TYPE PTR
 117 #define TC_INIT_FIX_DATA(FIXP) ((FIXP)->tc_fix_data = NULL)
 118
 119 #if defined OBJ_ELF || defined OBJ_COFF
 120 #include "write.h"        /* For definition of fixS */
 121 #define obj_fix_adjustable(fixP) arm_fix_adjustable (fixP)
 122 boolean arm_fix_adjustable PARAMS ((fixS *));
 123
 124 /* This arranges for gas/write.c to not apply a relocation if
 125    obj_fix_adjustable() says it is not adjustable.  */
 126 #define TC_FIX_ADJUSTABLE(fixP) obj_fix_adjustable (fixP)
 127 #else
 128 #define obj_fix_adjustable(fixP) 0
 129 #endif
 130
 131 /* We need to keep some local information on symbols.  */
 132
 133 #define TC_SYMFIELD_TYPE unsigned int
 134 #define ARM_GET_FLAG(s)         (*symbol_get_tc (s))
 135 #define ARM_SET_FLAG(s,v)       (*symbol_get_tc (s) |= (v))
 136 #define ARM_RESET_FLAG(s,v)     (*symbol_get_tc (s) &= ~(v))
 137
 138 #define ARM_FLAG_THUMB          (1 << 0)        /* The symbol is a Thumb symbol rather than an Arm symbol.  */
 139 #define ARM_FLAG_INTERWORK      (1 << 1)        /* The symbol is attached to code that suppports interworking.  */
 140 #define THUMB_FLAG_FUNC         (1 << 2)        /* The symbol is attached to the start of a Thumb function.  */
 141
 142 #define ARM_IS_THUMB(s)         (ARM_GET_FLAG (s) & ARM_FLAG_THUMB)
 143 #define ARM_IS_INTERWORK(s)     (ARM_GET_FLAG (s) & ARM_FLAG_INTERWORK)
 144 #define THUMB_IS_FUNC(s)        (ARM_GET_FLAG (s) & THUMB_FLAG_FUNC)
 145
 146 #define ARM_SET_THUMB(s,t)      ((t) ? ARM_SET_FLAG (s, ARM_FLAG_THUMB)     : ARM_RESET_FLAG (s, ARM_FLAG_THUMB))
 147 #define ARM_SET_INTERWORK(s,t)  ((t) ? ARM_SET_FLAG (s, ARM_FLAG_INTERWORK) : ARM_RESET_FLAG (s, ARM_FLAG_INTERWORK))
 148 #define THUMB_SET_FUNC(s,t)     ((t) ? ARM_SET_FLAG (s, THUMB_FLAG_FUNC)    : ARM_RESET_FLAG (s, THUMB_FLAG_FUNC))
 149
 150 #define TC_START_LABEL(C,STR) \
 151   (c == ':' || (c == '/' && arm_data_in_code ()))
 152 int arm_data_in_code PARAMS ((void));
 153
 154 #define tc_canonicalize_symbol_name(str) \
 155  arm_canonicalize_symbol_name (str);
 156 char * arm_canonicalize_symbol_name PARAMS ((char *));
 157
 158 #define obj_adjust_symtab() arm_adjust_symtab ()
 159  extern void arm_adjust_symtab PARAMS ((void));
 160
 161 #ifdef OBJ_ELF
 162 #define obj_frob_symbol(sym, punt)  armelf_frob_symbol ((sym), & (punt))
 163 void armelf_frob_symbol PARAMS ((symbolS *, int *));
 164 #endif
 165
 166 #define tc_aout_pre_write_hook(x)       {;}     /* not used */
 167
 168 #define LISTING_HEADER "ARM GAS "
 169
 170 #define OPTIONAL_REGISTER_PREFIX '%'
 171
 172 #define md_operand(x)
 173
 174 #define LOCAL_LABEL(name) (name[0] == '.' && (name[1] == 'L'))
 175 #define LOCAL_LABELS_FB   1
 176 #ifdef OBJ_ELF
 177 #define LOCAL_LABEL_PREFIX '.'
 178 #endif
 179
 180 /* This expression evaluates to false if the relocation is for a local object
 181    for which we still want to do the relocation at runtime.  True if we
 182    are willing to perform this relocation while building the .o file.
 183    This is only used for pcrel relocations, so GOTOFF does not need to be
 184    checked here.  I am not sure if some of the others are ever used with
 185    pcrel, but it is easier to be safe than sorry.  */
 186
 187 #define TC_RELOC_RTSYM_LOC_FIXUP(FIX)  \
 188    (  (FIX)->fx_r_type != BFD_RELOC_ARM_GOT12 \
 189    && (FIX)->fx_r_type != BFD_RELOC_ARM_GOT32 \
 190    && (FIX)->fx_r_type != BFD_RELOC_32)
 191
 192 #define TC_CONS_FIX_NEW cons_fix_new_arm
 193  extern void cons_fix_new_arm PARAMS ((fragS *, int, int, expressionS *));
 194
 195 /* Don't allow symbols to be discarded on GOT related relocs,
 196    nor on globals.  */
 197 #define tc_fix_adjustable(x) (\
 198      ((x)->fx_r_type == BFD_RELOC_ARM_PLT32 \
 199    || (x)->fx_r_type == BFD_RELOC_ARM_GOT32 \
 200    || (x)->fx_r_type == BFD_RELOC_ARM_GOTOFF \
 201    || S_IS_EXTERN ((x)->fx_addsy) \
 202    || S_IS_WEAK ((x)->fx_addsy)) ? 0 : 1)
 203
 204 #ifdef OBJ_ELF
 205 #define GLOBAL_OFFSET_TABLE_NAME "_GLOBAL_OFFSET_TABLE_"
 206 #else
 207 #define GLOBAL_OFFSET_TABLE_NAME "__GLOBAL_OFFSET_TABLE_"
 208 #endif
 209
 210 #ifdef OBJ_ELF
 211 #define DWARF2_LINE_MIN_INSN_LENGTH 2
 212 #endif
 213
 214 #define MAX_MEM_FOR_RS_ALIGN_CODE 31
 215
 216 /* For frags in code sections we need to record whether they contain
 217    ARM code or THUMB code.  This is that if they have to be aligned,
 218    they can contain the correct type of no-op instruction.  */
 219 #define TC_FRAG_TYPE    int
 220 #define TC_FRAG_INIT(fragp)     arm_init_frag (fragp)
 221 extern void arm_init_frag PARAMS ((struct frag *));
 222
 223 #define HANDLE_ALIGN(fragp) arm_handle_align (fragp)
 224 extern void arm_handle_align PARAMS ((struct frag *));
 225
 226 #define md_do_align(N, FILL, LEN, MAX, LABEL)                                   \
 227   if (FILL == NULL && (N) != 0 && ! need_pass_2 && subseg_text_p (now_seg))     \
 228     {                                                                           \
 229       arm_frag_align_code (N, MAX);                                             \
 230       goto LABEL;                                                               \
 231     }
 232 extern void arm_frag_align_code PARAMS ((int, int));