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, 2007, 2008, 2009  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 3, 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 bfd_boolean arm_is_eabi (void);
 104 #endif
 105
 106 /* NOTE: The fake label creation in stabs.c:s_stab_generic() has
 107    deliberately not been updated to mark assembler created stabs
 108    symbols as Thumb.  */
 109
 110 #define TC_FIX_TYPE int
 111 #define TC_INIT_FIX_DATA(FIX) ((FIX)->tc_fix_data = 0)
 112
 113 /* We need to keep some local information on symbols.  */
 114
 115 #define TC_SYMFIELD_TYPE        unsigned int
 116 #define ARM_GET_FLAG(s)         (*symbol_get_tc (s))
 117 #define ARM_SET_FLAG(s,v)       (*symbol_get_tc (s) |= (v))
 118 #define ARM_RESET_FLAG(s,v)     (*symbol_get_tc (s) &= ~(v))
 119
 120 #define ARM_FLAG_THUMB          (1 << 0)        /* The symbol is a Thumb symbol rather than an Arm symbol.  */
 121 #define ARM_FLAG_INTERWORK      (1 << 1)        /* The symbol is attached to code that supports interworking.  */
 122 #define THUMB_FLAG_FUNC         (1 << 2)        /* The symbol is attached to the start of a Thumb function.  */
 123
 124 #define ARM_IS_THUMB(s)         (ARM_GET_FLAG (s) & ARM_FLAG_THUMB)
 125 #define ARM_IS_INTERWORK(s)     (ARM_GET_FLAG (s) & ARM_FLAG_INTERWORK)
 126
 127 #ifdef OBJ_ELF
 128
 129 /* For ELF objects THUMB_IS_FUNC is inferred from
 130    ARM_IS_THUMB and the function type.  */
 131 #define THUMB_IS_FUNC(s) \
 132   ((arm_is_eabi () \
 133     && (ARM_IS_THUMB (s)) \
 134     && (symbol_get_bfdsym (s)->flags & BSF_FUNCTION)) \
 135    || (ARM_GET_FLAG (s) & THUMB_FLAG_FUNC))
 136
 137 #define ARM_IS_FUNC(s) \
 138   ((arm_is_eabi () \
 139     && !(ARM_IS_THUMB (s)) \
 140     /* && !(THUMB_FLAG_FUNC & ARM_GET_FLAG (s)) \ */ \
 141     && (symbol_get_bfdsym (s)->flags & BSF_FUNCTION)))
 142
 143
 144 #else
 145
 146 #define THUMB_IS_FUNC(s)        (ARM_GET_FLAG (s) & THUMB_FLAG_FUNC)
 147 #define ARM_IS_FUNC(s)          (!THUMB_IS_FUNC (s) \
 148                                 && (symbol_get_bfdsym (s)->flags & BSF_FUNCTION))
 149 #endif
 150
 151 #define ARM_SET_THUMB(s,t)      ((t) ? ARM_SET_FLAG (s, ARM_FLAG_THUMB)     : ARM_RESET_FLAG (s, ARM_FLAG_THUMB))
 152 #define ARM_SET_INTERWORK(s,t)  ((t) ? ARM_SET_FLAG (s, ARM_FLAG_INTERWORK) : ARM_RESET_FLAG (s, ARM_FLAG_INTERWORK))
 153 #define THUMB_SET_FUNC(s,t)     ((t) ? ARM_SET_FLAG (s, THUMB_FLAG_FUNC)    : ARM_RESET_FLAG (s, THUMB_FLAG_FUNC))
 154
 155 void arm_copy_symbol_attributes (symbolS *, symbolS *);
 156
 157 #ifndef TC_COPY_SYMBOL_ATTRIBUTES
 158 #define TC_COPY_SYMBOL_ATTRIBUTES(DEST, SRC) \
 159   (arm_copy_symbol_attributes (DEST, SRC))
 160 #endif
 161
 162 #define TC_START_LABEL(C,STR)            (c == ':' || (c == '/' && arm_data_in_code ()))
 163 #define tc_canonicalize_symbol_name(str) arm_canonicalize_symbol_name (str);
 164 #define obj_adjust_symtab()              arm_adjust_symtab ()
 165
 166 #define LISTING_HEADER "ARM GAS "
 167
 168 #define OPTIONAL_REGISTER_PREFIX '%'
 169
 170 #define LOCAL_LABEL(name)  (name[0] == '.' && name[1] == 'L')
 171 #define LOCAL_LABELS_FB    1
 172
 173 /* This expression evaluates to true if the relocation is for a local
 174    object for which we still want to do the relocation at runtime.
 175    False if we are willing to perform this relocation while building
 176    the .o file.  GOTOFF does not need to be checked here because it is
 177    not pcrel.  I am not sure if some of the others are ever used with
 178    pcrel, but it is easier to be safe than sorry.  */
 179
 180 #define TC_FORCE_RELOCATION_LOCAL(FIX)                  \
 181   (!(FIX)->fx_pcrel                                     \
 182    || (FIX)->fx_r_type == BFD_RELOC_ARM_GOT32           \
 183    || (FIX)->fx_r_type == BFD_RELOC_32                  \
 184    || TC_FORCE_RELOCATION (FIX))
 185
 186 /* Force output of R_ARM_REL32 relocations against thumb function symbols.
 187    This is needed to ensure the low bit is handled correctly.  */
 188 #define TC_FORCE_RELOCATION_SUB_SAME(FIX, SEG)  \
 189   (THUMB_IS_FUNC ((FIX)->fx_addsy)              \
 190    || !SEG_NORMAL (SEG))
 191
 192 #define TC_CONS_FIX_NEW cons_fix_new_arm
 193
 194 #define MAX_MEM_FOR_RS_ALIGN_CODE 31
 195
 196 /* For frags in code sections we need to record whether they contain
 197    ARM code or THUMB code.  This is that if they have to be aligned,
 198    they can contain the correct type of no-op instruction.  */
 199 #define TC_FRAG_TYPE            int
 200 #define TC_FRAG_INIT(fragp)     arm_init_frag (fragp)
 201 #define HANDLE_ALIGN(fragp)     arm_handle_align (fragp)
 202
 203 #define md_do_align(N, FILL, LEN, MAX, LABEL)                                   \
 204   if (FILL == NULL && (N) != 0 && ! need_pass_2 && subseg_text_p (now_seg))     \
 205     {                                                                           \
 206       arm_frag_align_code (N, MAX);                                             \
 207       goto LABEL;                                                               \
 208     }
 209
 210 #define DWARF2_LINE_MIN_INSN_LENGTH     2
 211
 212 /* The lr register is r14.  */
 213 #define DWARF2_DEFAULT_RETURN_COLUMN  14
 214
 215 /* Registers are generally saved at negative offsets to the CFA.  */
 216 #define DWARF2_CIE_DATA_ALIGNMENT     (-4)
 217
 218 /* State variables for IT block handling.  */
 219 enum it_state
 220 {
 221   OUTSIDE_IT_BLOCK, MANUAL_IT_BLOCK, AUTOMATIC_IT_BLOCK
 222 };
 223 struct current_it
 224 {
 225   int mask;
 226   enum it_state state;
 227   int cc;
 228   int block_length;
 229   char *insn;
 230   int state_handled;
 231 };
 232
 233 #ifdef OBJ_ELF
 234 # define obj_frob_symbol(sym, punt)     armelf_frob_symbol ((sym), & (punt))
 235 # define md_elf_section_change_hook()   arm_elf_change_section ()
 236 # define md_elf_section_type(str, len)  arm_elf_section_type (str, len)
 237 # define GLOBAL_OFFSET_TABLE_NAME       "_GLOBAL_OFFSET_TABLE_"
 238 # define TC_SEGMENT_INFO_TYPE           struct arm_segment_info_type
 239
 240 /* This is not really an alignment operation, but it's something we
 241    need to do at the same time: whenever we are figuring out the
 242    alignment for data, we should check whether a $d symbol is
 243    necessary.  */
 244 # define md_cons_align(nbytes)          mapping_state (MAP_DATA)
 245
 246 enum mstate
 247 {
 248   MAP_UNDEFINED = 0, /* Must be zero, for seginfo in new sections.  */
 249   MAP_DATA,
 250   MAP_ARM,
 251   MAP_THUMB
 252 };
 253
 254 void mapping_state (enum mstate);
 255
 256 struct arm_segment_info_type
 257 {
 258   enum mstate mapstate;
 259   unsigned int marked_pr_dependency;
 260   struct current_it current_it;
 261 };
 262
 263 /* We want .cfi_* pseudo-ops for generating unwind info.  */
 264 #define TARGET_USE_CFIPOP              1
 265
 266 /* CFI hooks.  */
 267 #define tc_regname_to_dw2regnum            tc_arm_regname_to_dw2regnum
 268 #define tc_cfi_frame_initial_instructions  tc_arm_frame_initial_instructions
 269
 270 #else /* Not OBJ_ELF.  */
 271 #define GLOBAL_OFFSET_TABLE_NAME "__GLOBAL_OFFSET_TABLE_"
 272 #endif
 273
 274 #if defined OBJ_ELF || defined OBJ_COFF
 275
 276 # define EXTERN_FORCE_RELOC                     1
 277 # define tc_fix_adjustable(FIX)                 arm_fix_adjustable (FIX)
 278 #endif
 279
 280 #ifdef OBJ_ELF
 281 /* Values passed to md_apply_fix don't include the symbol value.  */
 282 # define MD_APPLY_SYM_VALUE(FIX)                arm_apply_sym_value (FIX)
 283 #endif
 284
 285 #ifdef OBJ_COFF
 286 # define TC_VALIDATE_FIX(FIX, SEGTYPE, LABEL)   arm_validate_fix (FIX)
 287 /* Values passed to md_apply_fix don't include the symbol value.  */
 288 # define MD_APPLY_SYM_VALUE(FIX)                0
 289 #endif
 290
 291 #define MD_PCREL_FROM_SECTION(F,S) md_pcrel_from_section(F,S)
 292
 293 extern long md_pcrel_from_section (struct fix *, segT);
 294 extern void arm_frag_align_code (int, int);
 295 extern void arm_validate_fix (struct fix *);
 296 extern const char * elf32_arm_target_format (void);
 297 extern void arm_elf_change_section (void);
 298 extern int arm_force_relocation (struct fix *);
 299 extern void arm_cleanup (void);
 300 extern void arm_start_line_hook (void);
 301 extern void arm_frob_label (symbolS *);
 302 extern int arm_data_in_code (void);
 303 extern char * arm_canonicalize_symbol_name (char *);
 304 extern void arm_adjust_symtab (void);
 305 extern void armelf_frob_symbol (symbolS *, int *);
 306 extern void cons_fix_new_arm (fragS *, int, int, expressionS *);
 307 extern void arm_init_frag (struct frag *);
 308 extern void arm_handle_align (struct frag *);
 309 extern bfd_boolean arm_fix_adjustable (struct fix *);
 310 extern int arm_elf_section_type (const char *, size_t);
 311 extern int tc_arm_regname_to_dw2regnum (char *regname);
 312 extern void tc_arm_frame_initial_instructions (void);
 313
 314 #ifdef TE_PE
 315
 316 #define O_secrel O_md1
 317
 318 #define TC_DWARF2_EMIT_OFFSET  tc_pe_dwarf2_emit_offset
 319 void tc_pe_dwarf2_emit_offset (symbolS *, unsigned int);
 320
 321 #endif /* TE_PE */
 322
 323 #ifdef OBJ_ELF
 324 #define CONVERT_SYMBOLIC_ATTRIBUTE(name) arm_convert_symbolic_attribute (name)
 325 extern int arm_convert_symbolic_attribute (const char *);
 326 extern int arm_apply_sym_value (struct fix *);
 327 #endif