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 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 #  else
  70 #   define TARGET_FORMAT (target_big_endian ? "pe-arm-big" : "pe-arm-little")
  71 #  endif
  72 # else
  73 #  define TARGET_FORMAT (target_big_endian ? "coff-arm-big" : "coff-arm-little")
  74 # endif
  75 #elif defined OBJ_ELF
  76 # define ARM_BI_ENDIAN
  77 # define TARGET_FORMAT  elf32_arm_target_format ()
  78 #endif
  79
  80 #define TC_FORCE_RELOCATION(FIX) arm_force_relocation (FIX)
  81
  82 #define md_convert_frag(b, s, f) { as_fatal (_("arm convert_frag\n")); }
  83
  84 #define md_cleanup() arm_cleanup ()
  85
  86 #define md_start_line_hook() arm_start_line_hook ()
  87
  88 #define tc_frob_label(S) arm_frob_label (S)
  89
  90 /* We also need to mark assembler created symbols:  */
  91 #define tc_frob_fake_label(S) arm_frob_label (S)
  92
  93 /* NOTE: The fake label creation in stabs.c:s_stab_generic() has
  94    deliberately not been updated to mark assembler created stabs
  95    symbols as Thumb.  */
  96
  97 #define TC_FIX_TYPE int
  98 #define TC_INIT_FIX_DATA(FIX) ((FIX)->tc_fix_data = 0)
  99
 100 /* We need to keep some local information on symbols.  */
 101
 102 #define TC_SYMFIELD_TYPE        unsigned int
 103 #define ARM_GET_FLAG(s)         (*symbol_get_tc (s))
 104 #define ARM_SET_FLAG(s,v)       (*symbol_get_tc (s) |= (v))
 105 #define ARM_RESET_FLAG(s,v)     (*symbol_get_tc (s) &= ~(v))
 106
 107 #define ARM_FLAG_THUMB          (1 << 0)        /* The symbol is a Thumb symbol rather than an Arm symbol.  */
 108 #define ARM_FLAG_INTERWORK      (1 << 1)        /* The symbol is attached to code that supports interworking.  */
 109 #define THUMB_FLAG_FUNC         (1 << 2)        /* The symbol is attached to the start of a Thumb function.  */
 110
 111 #define ARM_IS_THUMB(s)         (ARM_GET_FLAG (s) & ARM_FLAG_THUMB)
 112 #define ARM_IS_INTERWORK(s)     (ARM_GET_FLAG (s) & ARM_FLAG_INTERWORK)
 113 #define THUMB_IS_FUNC(s)        (ARM_GET_FLAG (s) & THUMB_FLAG_FUNC)
 114
 115 #define ARM_SET_THUMB(s,t)      ((t) ? ARM_SET_FLAG (s, ARM_FLAG_THUMB)     : ARM_RESET_FLAG (s, ARM_FLAG_THUMB))
 116 #define ARM_SET_INTERWORK(s,t)  ((t) ? ARM_SET_FLAG (s, ARM_FLAG_INTERWORK) : ARM_RESET_FLAG (s, ARM_FLAG_INTERWORK))
 117 #define THUMB_SET_FUNC(s,t)     ((t) ? ARM_SET_FLAG (s, THUMB_FLAG_FUNC)    : ARM_RESET_FLAG (s, THUMB_FLAG_FUNC))
 118
 119 #define TC_START_LABEL(C,STR)            (c == ':' || (c == '/' && arm_data_in_code ()))
 120 #define tc_canonicalize_symbol_name(str) arm_canonicalize_symbol_name (str);
 121 #define obj_adjust_symtab()              arm_adjust_symtab ()
 122
 123 #define LISTING_HEADER "ARM GAS "
 124
 125 #define OPTIONAL_REGISTER_PREFIX '%'
 126
 127 #define LOCAL_LABEL(name)  (name[0] == '.' && name[1] == 'L')
 128 #define LOCAL_LABELS_FB    1
 129
 130 /* This expression evaluates to true if the relocation is for a local
 131    object for which we still want to do the relocation at runtime.
 132    False if we are willing to perform this relocation while building
 133    the .o file.  GOTOFF does not need to be checked here because it is
 134    not pcrel.  I am not sure if some of the others are ever used with
 135    pcrel, but it is easier to be safe than sorry.  */
 136
 137 #define TC_FORCE_RELOCATION_LOCAL(FIX)                  \
 138   (!(FIX)->fx_pcrel                                     \
 139    || (FIX)->fx_plt                                     \
 140    || (FIX)->fx_r_type == BFD_RELOC_ARM_GOT32           \
 141    || (FIX)->fx_r_type == BFD_RELOC_32                  \
 142    || TC_FORCE_RELOCATION (FIX))
 143
 144 #define TC_CONS_FIX_NEW cons_fix_new_arm
 145
 146 #define MAX_MEM_FOR_RS_ALIGN_CODE 31
 147
 148 /* For frags in code sections we need to record whether they contain
 149    ARM code or THUMB code.  This is that if they have to be aligned,
 150    they can contain the correct type of no-op instruction.  */
 151 #define TC_FRAG_TYPE            int
 152 #define TC_FRAG_INIT(fragp)     arm_init_frag (fragp)
 153 #define HANDLE_ALIGN(fragp)     arm_handle_align (fragp)
 154
 155 #define md_do_align(N, FILL, LEN, MAX, LABEL)                                   \
 156   if (FILL == NULL && (N) != 0 && ! need_pass_2 && subseg_text_p (now_seg))     \
 157     {                                                                           \
 158       arm_frag_align_code (N, MAX);                                             \
 159       goto LABEL;                                                               \
 160     }
 161
 162 #ifdef OBJ_ELF
 163 # define DWARF2_LINE_MIN_INSN_LENGTH    2
 164 # define obj_frob_symbol(sym, punt)     armelf_frob_symbol ((sym), & (punt))
 165 # define md_elf_section_change_hook()   arm_elf_change_section ()
 166 # define md_elf_section_type(str, len)  arm_elf_section_type (str, len)
 167 # define GLOBAL_OFFSET_TABLE_NAME       "_GLOBAL_OFFSET_TABLE_"
 168 # define TC_SEGMENT_INFO_TYPE           struct arm_segment_info_type
 169
 170 enum mstate
 171 {
 172   MAP_UNDEFINED = 0, /* Must be zero, for seginfo in new sections.  */
 173   MAP_DATA,
 174   MAP_ARM,
 175   MAP_THUMB
 176 };
 177
 178 struct arm_segment_info_type
 179 {
 180   enum mstate mapstate;
 181   unsigned int marked_pr_dependency;
 182 };
 183
 184 /* We want .cfi_* pseudo-ops for generating unwind info.  */
 185 #define TARGET_USE_CFIPOP              1
 186
 187 /* The lr register is r14.  */
 188 #define DWARF2_DEFAULT_RETURN_COLUMN  14
 189
 190 /* Registers are generally saved at negative offsets to the CFA.  */
 191 #define DWARF2_CIE_DATA_ALIGNMENT     -4
 192
 193 /* CFI hooks.  */
 194 #define tc_regname_to_dw2regnum            tc_arm_regname_to_dw2regnum
 195 #define tc_cfi_frame_initial_instructions  tc_arm_frame_initial_instructions
 196
 197 #else /* Not OBJ_ELF.  */
 198 #define GLOBAL_OFFSET_TABLE_NAME "__GLOBAL_OFFSET_TABLE_"
 199 #endif
 200
 201 #if defined OBJ_ELF || defined OBJ_COFF
 202
 203 # define EXTERN_FORCE_RELOC                     1
 204 # define tc_fix_adjustable(FIX)                 arm_fix_adjustable (FIX)
 205 /* Values passed to md_apply_fix don't include the symbol value.  */
 206 # define MD_APPLY_SYM_VALUE(FIX)                0
 207 # define TC_VALIDATE_FIX(FIX, SEGTYPE, LABEL)   arm_validate_fix (FIX)
 208
 209 #endif
 210
 211 #define MD_PCREL_FROM_SECTION(F,S) md_pcrel_from_section(F,S)
 212
 213 extern long md_pcrel_from_section (struct fix *, segT);
 214 extern void arm_frag_align_code (int, int);
 215 extern void arm_validate_fix (struct fix *);
 216 extern const char * elf32_arm_target_format (void);
 217 extern void arm_elf_change_section (void);
 218 extern int arm_force_relocation (struct fix *);
 219 extern void arm_cleanup (void);
 220 extern void arm_start_line_hook (void);
 221 extern void arm_frob_label (symbolS *);
 222 extern int arm_data_in_code (void);
 223 extern char * arm_canonicalize_symbol_name (char *);
 224 extern void arm_adjust_symtab (void);
 225 extern void armelf_frob_symbol (symbolS *, int *);
 226 extern void cons_fix_new_arm (fragS *, int, int, expressionS *);
 227 extern void arm_init_frag (struct frag *);
 228 extern void arm_handle_align (struct frag *);
 229 extern bfd_boolean arm_fix_adjustable (struct fix *);
 230 extern int arm_elf_section_type (const char *, size_t);
 231 extern int tc_arm_regname_to_dw2regnum (const char *regname);
 232 extern void tc_arm_frame_initial_instructions (void);