gas/config/tc-arm.h

   1 /* This file is tc-arm.h
   2    Copyright 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003,
   3    2004, 2005, 2006 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, 51 Franklin Street - Fifth Floor, Boston, MA
  22    02110-1301, 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 DIFF_EXPR_OK
  36
  37 #ifdef  LITTLE_ENDIAN
  38 #undef  LITTLE_ENDIAN
  39 #endif
  40
  41 #ifdef  BIG_ENDIAN
  42 #undef  BIG_ENDIAN
  43 #endif
  44
  45 #define LITTLE_ENDIAN   1234
  46 #define BIG_ENDIAN      4321
  47
  48 struct fix;
  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 (target_big_endian ? "a.out-arm-big" : "a.out-arm-little")
  61 # endif
  62 #elif defined OBJ_AIF
  63 # define TARGET_FORMAT "aif"
  64 #elif defined OBJ_COFF
  65 # define ARM_BI_ENDIAN
  66 # if defined TE_PE
  67 #  if defined TE_EPOC
  68 #   define TARGET_FORMAT (target_big_endian ? "epoc-pe-arm-big" : "epoc-pe-arm-little")
  69 #  elif defined TE_WINCE
  70 #   define TARGET_FORMAT (target_big_endian ? "pe-arm-wince-big" : "pe-arm-wince-little")
  71 #  else
  72 #   define TARGET_FORMAT (target_big_endian ? "pe-arm-big" : "pe-arm-little")
  73 #  endif
  74 # else
  75 #  define TARGET_FORMAT (target_big_endian ? "coff-arm-big" : "coff-arm-little")
  76 # endif
  77 #elif defined OBJ_ELF
  78 # define ARM_BI_ENDIAN
  79 # define TARGET_FORMAT  elf32_arm_target_format ()
  80 #endif
  81
  82 #define TC_FORCE_RELOCATION(FIX) arm_force_relocation (FIX)
  83
  84 #define md_relax_frag(segment, fragp, stretch) \
  85   arm_relax_frag(segment, fragp, stretch)
  86 extern int arm_relax_frag (asection *, struct frag *, long);
  87
  88 #define md_optimize_expr(l,o,r)         arm_optimize_expr (l, o, r)
  89 extern int arm_optimize_expr (expressionS *, operatorT, expressionS *);
  90
  91 #define md_cleanup() arm_cleanup ()
  92
  93 #define md_start_line_hook() arm_start_line_hook ()
  94
  95 #define tc_frob_label(S) arm_frob_label (S)
  96
  97 /* We also need to mark assembler created symbols:  */
  98 #define tc_frob_fake_label(S) arm_frob_label (S)
  99
 100 #ifdef OBJ_ELF
 101 #define md_end arm_md_end
 102 extern void arm_md_end (void);
 103 #endif
 104
 105 /* NOTE: The fake label creation in stabs.c:s_stab_generic() has
 106    deliberately not been updated to mark assembler created stabs
 107    symbols as Thumb.  */
 108
 109 #define TC_FIX_TYPE int
 110 #define TC_INIT_FIX_DATA(FIX) ((FIX)->tc_fix_data = 0)
 111
 112 /* We need to keep some local information on symbols.  */
 113
 114 #define TC_SYMFIELD_TYPE        unsigned int
 115 #define ARM_GET_FLAG(s)         (*symbol_get_tc (s))
 116 #define ARM_SET_FLAG(s,v)       (*symbol_get_tc (s) |= (v))
 117 #define ARM_RESET_FLAG(s,v)     (*symbol_get_tc (s) &= ~(v))
 118
 119 #define ARM_FLAG_THUMB          (1 << 0)        /* The symbol is a Thumb symbol rather than an Arm symbol.  */
 120 #define ARM_FLAG_INTERWORK      (1 << 1)        /* The symbol is attached to code that supports interworking.  */
 121 #define THUMB_FLAG_FUNC         (1 << 2)        /* The symbol is attached to the start of a Thumb function.  */
 122
 123 #define ARM_IS_THUMB(s)         (ARM_GET_FLAG (s) & ARM_FLAG_THUMB)
 124 #define ARM_IS_INTERWORK(s)     (ARM_GET_FLAG (s) & ARM_FLAG_INTERWORK)
 125 #define THUMB_IS_FUNC(s)        (ARM_GET_FLAG (s) & THUMB_FLAG_FUNC)
 126
 127 #define ARM_SET_THUMB(s,t)      ((t) ? ARM_SET_FLAG (s, ARM_FLAG_THUMB)     : ARM_RESET_FLAG (s, ARM_FLAG_THUMB))
 128 #define ARM_SET_INTERWORK(s,t)  ((t) ? ARM_SET_FLAG (s, ARM_FLAG_INTERWORK) : ARM_RESET_FLAG (s, ARM_FLAG_INTERWORK))
 129 #define THUMB_SET_FUNC(s,t)     ((t) ? ARM_SET_FLAG (s, THUMB_FLAG_FUNC)    : ARM_RESET_FLAG (s, THUMB_FLAG_FUNC))
 130
 131 #define TC_START_LABEL(C,STR)            (c == ':' || (c == '/' && arm_data_in_code ()))
 132 #define tc_canonicalize_symbol_name(str) arm_canonicalize_symbol_name (str);
 133 #define obj_adjust_symtab()              arm_adjust_symtab ()
 134
 135 #define LISTING_HEADER "ARM GAS "
 136
 137 #define OPTIONAL_REGISTER_PREFIX '%'
 138
 139 #define LOCAL_LABEL(name)  (name[0] == '.' && name[1] == 'L')
 140 #define LOCAL_LABELS_FB    1
 141
 142 /* This expression evaluates to true if the relocation is for a local
 143    object for which we still want to do the relocation at runtime.
 144    False if we are willing to perform this relocation while building
 145    the .o file.  GOTOFF does not need to be checked here because it is
 146    not pcrel.  I am not sure if some of the others are ever used with
 147    pcrel, but it is easier to be safe than sorry.  */
 148
 149 #define TC_FORCE_RELOCATION_LOCAL(FIX)                  \
 150   (!(FIX)->fx_pcrel                                     \
 151    || (FIX)->fx_plt                                     \
 152    || (FIX)->fx_r_type == BFD_RELOC_ARM_GOT32           \
 153    || (FIX)->fx_r_type == BFD_RELOC_32                  \
 154    || TC_FORCE_RELOCATION (FIX))
 155
 156 /* Force output of R_ARM_REL32 relocations against thumb function symbols.
 157    This is needed to ensure the low bit is handled correctly.  */
 158 #define TC_FORCE_RELOCATION_SUB_SAME(FIX, SEG)  \
 159   (THUMB_IS_FUNC ((FIX)->fx_addsy)              \
 160    || !SEG_NORMAL (SEG))
 161
 162 #define TC_CONS_FIX_NEW cons_fix_new_arm
 163
 164 #define MAX_MEM_FOR_RS_ALIGN_CODE 31
 165
 166 /* For frags in code sections we need to record whether they contain
 167    ARM code or THUMB code.  This is that if they have to be aligned,
 168    they can contain the correct type of no-op instruction.  */
 169 #define TC_FRAG_TYPE            int
 170 #define TC_FRAG_INIT(fragp)     arm_init_frag (fragp)
 171 #define HANDLE_ALIGN(fragp)     arm_handle_align (fragp)
 172
 173 #define md_do_align(N, FILL, LEN, MAX, LABEL)                                   \
 174   if (FILL == NULL && (N) != 0 && ! need_pass_2 && subseg_text_p (now_seg))     \
 175     {                                                                           \
 176       arm_frag_align_code (N, MAX);                                             \
 177       goto LABEL;                                                               \
 178     }
 179
 180 #define DWARF2_LINE_MIN_INSN_LENGTH     2
 181
 182 /* The lr register is r14.  */
 183 #define DWARF2_DEFAULT_RETURN_COLUMN  14
 184
 185 /* Registers are generally saved at negative offsets to the CFA.  */
 186 #define DWARF2_CIE_DATA_ALIGNMENT     (-4)
 187
 188 #ifdef OBJ_ELF
 189 # define obj_frob_symbol(sym, punt)     armelf_frob_symbol ((sym), & (punt))
 190 # define md_elf_section_change_hook()   arm_elf_change_section ()
 191 # define md_elf_section_type(str, len)  arm_elf_section_type (str, len)
 192 # define GLOBAL_OFFSET_TABLE_NAME       "_GLOBAL_OFFSET_TABLE_"
 193 # define TC_SEGMENT_INFO_TYPE           struct arm_segment_info_type
 194
 195 /* This is not really an alignment operation, but it's something we
 196    need to do at the same time: whenever we are figuring out the
 197    alignment for data, we should check whether a $d symbol is
 198    necessary.  */
 199 # define md_cons_align(nbytes)          mapping_state (MAP_DATA)
 200
 201 enum mstate
 202 {
 203   MAP_UNDEFINED = 0, /* Must be zero, for seginfo in new sections.  */
 204   MAP_DATA,
 205   MAP_ARM,
 206   MAP_THUMB
 207 };
 208
 209 void mapping_state (enum mstate);
 210
 211 struct arm_segment_info_type
 212 {
 213   enum mstate mapstate;
 214   unsigned int marked_pr_dependency;
 215 };
 216
 217 /* We want .cfi_* pseudo-ops for generating unwind info.  */
 218 #define TARGET_USE_CFIPOP              1
 219
 220 /* CFI hooks.  */
 221 #define tc_regname_to_dw2regnum            tc_arm_regname_to_dw2regnum
 222 #define tc_cfi_frame_initial_instructions  tc_arm_frame_initial_instructions
 223
 224 #else /* Not OBJ_ELF.  */
 225 #define GLOBAL_OFFSET_TABLE_NAME "__GLOBAL_OFFSET_TABLE_"
 226 #endif
 227
 228 #if defined OBJ_ELF || defined OBJ_COFF
 229
 230 # define EXTERN_FORCE_RELOC                     1
 231 # define tc_fix_adjustable(FIX)                 arm_fix_adjustable (FIX)
 232 /* Values passed to md_apply_fix don't include the symbol value.  */
 233 # define MD_APPLY_SYM_VALUE(FIX)                0
 234 # define TC_VALIDATE_FIX(FIX, SEGTYPE, LABEL)   arm_validate_fix (FIX)
 235
 236 #endif
 237
 238 #define MD_PCREL_FROM_SECTION(F,S) md_pcrel_from_section(F,S)
 239
 240 extern long md_pcrel_from_section (struct fix *, segT);
 241 extern void arm_frag_align_code (int, int);
 242 extern void arm_validate_fix (struct fix *);
 243 extern const char * elf32_arm_target_format (void);
 244 extern void arm_elf_change_section (void);
 245 extern int arm_force_relocation (struct fix *);
 246 extern void arm_cleanup (void);
 247 extern void arm_start_line_hook (void);
 248 extern void arm_frob_label (symbolS *);
 249 extern int arm_data_in_code (void);
 250 extern char * arm_canonicalize_symbol_name (char *);
 251 extern void arm_adjust_symtab (void);
 252 extern void armelf_frob_symbol (symbolS *, int *);
 253 extern void cons_fix_new_arm (fragS *, int, int, expressionS *);
 254 extern void arm_init_frag (struct frag *);
 255 extern void arm_handle_align (struct frag *);
 256 extern bfd_boolean arm_fix_adjustable (struct fix *);
 257 extern int arm_elf_section_type (const char *, size_t);
 258 extern int tc_arm_regname_to_dw2regnum (char *regname);
 259 extern void tc_arm_frame_initial_instructions (void);
 260
 261 #ifdef TE_PE
 262
 263 #define O_secrel O_md1
 264
 265 #define TC_DWARF2_EMIT_OFFSET  tc_pe_dwarf2_emit_offset
 266 void tc_pe_dwarf2_emit_offset (symbolS *, unsigned int);
 267
 268 #endif /* TE_PE */