gas/config/tc-sh.h

   1 /* This file is tc-sh.h
   2    Copyright 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002,
   3    2003 Free Software Foundation, Inc.
   4
   5    This file is part of GAS, the GNU Assembler.
   6
   7    GAS 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    GAS 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 GAS; 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 #define TC_SH
  23
  24 #define TARGET_ARCH bfd_arch_sh
  25
  26 #if ANSI_PROTOTYPES
  27 /* The type fixS is defined (to struct fix) in write.h, but write.h uses
  28    definitions from this file.  To avoid problems with including write.h
  29    after the "right" definitions, don't; just forward-declare struct fix
  30    here.  */
  31 struct fix;
  32 struct segment_info_struct;
  33 struct internal_reloc;
  34 #endif
  35
  36 /* Whether -relax was used.  */
  37 extern int sh_relax;
  38
  39 /* Whether -small was used.  */
  40 extern int sh_small;
  41
  42 /* Don't try to break words.  */
  43 #define WORKING_DOT_WORD
  44
  45 /* All SH instructions are multiples of 16 bits.  */
  46 #define DWARF2_LINE_MIN_INSN_LENGTH 2
  47
  48 /* We require .long, et. al., to be aligned correctly.  */
  49 #define md_cons_align(nbytes) sh_cons_align (nbytes)
  50 extern void sh_cons_align PARAMS ((int));
  51
  52 /* When relaxing, we need to generate relocations for alignment
  53    directives.  */
  54 #define HANDLE_ALIGN(frag) sh_handle_align (frag)
  55 extern void sh_handle_align PARAMS ((fragS *));
  56
  57 #define MAX_MEM_FOR_RS_ALIGN_CODE (1 + 2)
  58
  59 /* We need to force out some relocations when relaxing.  */
  60 #define TC_FORCE_RELOCATION(fix) sh_force_relocation (fix)
  61 extern int sh_force_relocation PARAMS ((struct fix *));
  62
  63 /* This macro decides whether a particular reloc is an entry in a
  64    switch table.  It is used when relaxing, because the linker needs
  65    to know about all such entries so that it can adjust them if
  66    necessary.  */
  67
  68 #ifdef BFD_ASSEMBLER
  69 #define SWITCH_TABLE_CONS(FIX) (0)
  70 #else
  71 #define SWITCH_TABLE_CONS(FIX)                          \
  72   ((FIX)->fx_r_type == 0                                \
  73    && ((FIX)->fx_size == 2                              \
  74        || (FIX)->fx_size == 1                           \
  75        || (FIX)->fx_size == 4))
  76 #endif
  77
  78 #define SWITCH_TABLE(FIX)                               \
  79   ((FIX)->fx_addsy != NULL                              \
  80    && (FIX)->fx_subsy != NULL                           \
  81    && S_GET_SEGMENT ((FIX)->fx_addsy) == text_section   \
  82    && S_GET_SEGMENT ((FIX)->fx_subsy) == text_section   \
  83    && ((FIX)->fx_r_type == BFD_RELOC_32                 \
  84        || (FIX)->fx_r_type == BFD_RELOC_16              \
  85        || (FIX)->fx_r_type == BFD_RELOC_8               \
  86        || SWITCH_TABLE_CONS (FIX)))
  87
  88 #define TC_FORCE_RELOCATION_SUB_SAME(FIX, SEC)          \
  89   (! SEG_NORMAL (SEC)                                   \
  90    || TC_FORCE_RELOCATION (FIX)                         \
  91    || (sh_relax && SWITCH_TABLE (FIX)))
  92
  93 /* Don't complain when we leave fx_subsy around.  */
  94 #define TC_VALIDATE_FIX_SUB(FIX)                        \
  95   (sh_relax && SWITCH_TABLE (FIX))
  96
  97 #define MD_PCREL_FROM_SECTION(FIX, SEC) md_pcrel_from_section (FIX, SEC)
  98 extern long md_pcrel_from_section PARAMS ((struct fix *, segT));
  99
 100 #define IGNORE_NONSTANDARD_ESCAPES
 101
 102 #define LISTING_HEADER \
 103   (!target_big_endian \
 104    ? "Renesas / SuperH SH GAS Little Endian" \
 105    : "Renesas / SuperH SH GAS Big Endian")
 106
 107 #define md_operand(x)
 108
 109 extern const struct relax_type md_relax_table[];
 110 #define TC_GENERIC_RELAX_TABLE md_relax_table
 111
 112 /* We record, for each section, whether we have most recently output a
 113    CODE reloc or a DATA reloc.  */
 114 struct sh_segment_info_type
 115 {
 116   int in_code : 1;
 117 };
 118 #define TC_SEGMENT_INFO_TYPE struct sh_segment_info_type
 119
 120 /* We call a routine to emit a reloc for a label, so that the linker
 121    can align loads and stores without crossing a label.  */
 122 extern void sh_frob_label PARAMS ((void));
 123 #define tc_frob_label(sym) sh_frob_label ()
 124
 125 /* We call a routine to flush pending output in order to output a DATA
 126    reloc when required.  */
 127 extern void sh_flush_pending_output PARAMS ((void));
 128 #define md_flush_pending_output() sh_flush_pending_output ()
 129
 130 #ifdef BFD_ASSEMBLER
 131 #define tc_frob_file_before_adjust sh_frob_file
 132 #else
 133 #define tc_frob_file sh_frob_file
 134 #endif
 135 extern void sh_frob_file PARAMS ((void));
 136
 137
 138 #ifdef OBJ_COFF
 139 /* COFF specific definitions.  */
 140
 141 #define DO_NOT_STRIP 0
 142
 143 /* This macro translates between an internal fix and a coff reloc type.  */
 144 #define TC_COFF_FIX2RTYPE(fix) ((fix)->fx_r_type)
 145
 146 #define BFD_ARCH TARGET_ARCH
 147
 148 #define COFF_MAGIC (!target_big_endian ? SH_ARCH_MAGIC_LITTLE : SH_ARCH_MAGIC_BIG)
 149
 150 /* We need to write out relocs which have not been completed.  */
 151 #define TC_COUNT_RELOC(fix) ((fix)->fx_addsy != NULL)
 152
 153 #define TC_RELOC_MANGLE(seg, fix, int, paddr) \
 154   sh_coff_reloc_mangle ((seg), (fix), (int), (paddr))
 155 extern void sh_coff_reloc_mangle
 156   PARAMS ((struct segment_info_struct *, struct fix *,
 157            struct internal_reloc *, unsigned int));
 158
 159 #define tc_coff_symbol_emit_hook(a) ; /* not used */
 160
 161 #define NEED_FX_R_TYPE 1
 162
 163 #define TC_KEEP_FX_OFFSET 1
 164
 165 #define TC_COFF_SIZEMACHDEP(frag) tc_coff_sizemachdep(frag)
 166 extern int tc_coff_sizemachdep PARAMS ((fragS *));
 167
 168 #ifdef BFD_ASSEMBLER
 169 #define SEG_NAME(SEG) segment_name (SEG)
 170 #else
 171 #define SEG_NAME(SEG) obj_segment_name (SEG)
 172 #endif
 173
 174 /* We align most sections to a 16 byte boundary.  */
 175 #define SUB_SEGMENT_ALIGN(SEG, FRCHAIN)                 \
 176   (strncmp (SEG_NAME (SEG), ".stabstr", 8) == 0         \
 177    ? 0                                                  \
 178    : ((strncmp (SEG_NAME (SEG), ".stab", 5) == 0        \
 179        || strcmp (SEG_NAME (SEG), ".ctors") == 0        \
 180        || strcmp (SEG_NAME (SEG), ".dtors") == 0)       \
 181       ? 2                                               \
 182       : (sh_small ? 2 : 4)))
 183
 184 #endif /* OBJ_COFF */
 185
 186 #ifdef OBJ_ELF
 187 /* ELF specific definitions.  */
 188
 189 /* Whether or not the target is big endian */
 190 extern int target_big_endian;
 191 #ifdef TE_LINUX
 192 #define TARGET_FORMAT (!target_big_endian ? "elf32-sh-linux" : "elf32-shbig-linux")
 193 #elif defined(TE_NetBSD)
 194 #define TARGET_FORMAT (!target_big_endian ? "elf32-shl-nbsd" : "elf32-sh-nbsd")
 195 #else
 196 #define TARGET_FORMAT (!target_big_endian ? "elf32-shl" : "elf32-sh")
 197 #endif
 198
 199 #define elf_tc_final_processing sh_elf_final_processing
 200 extern void sh_elf_final_processing PARAMS ((void));
 201
 202 #define DIFF_EXPR_OK            /* foo-. gets turned into PC relative relocs */
 203
 204 #define GLOBAL_OFFSET_TABLE_NAME "_GLOBAL_OFFSET_TABLE_"
 205
 206 /* This is the relocation type for direct references to
 207    GLOBAL_OFFSET_TABLE.  It comes up in complicated expressions such
 208    as _GLOBAL_OFFSET_TABLE_+[.-.L284], which cannot be expressed
 209    normally with the regular expressions.  The fixup specified here
 210    when used at runtime implies that we should add the address of the
 211    GOT to the specified location, and as a result we have simplified
 212    the expression into something we can use.  */
 213 #define TC_RELOC_GLOBAL_OFFSET_TABLE BFD_RELOC_SH_GOTPC
 214
 215 #define tc_fix_adjustable(FIX) sh_fix_adjustable(FIX)
 216 extern bfd_boolean sh_fix_adjustable PARAMS ((struct fix *));
 217
 218 /* Values passed to md_apply_fix3 don't include symbol values.  */
 219 #define MD_APPLY_SYM_VALUE(FIX) 0
 220
 221 /* This expression evaluates to true if the relocation is for a local object
 222    for which we still want to do the relocation at runtime.  False if we
 223    are willing to perform this relocation while building the .o file.
 224
 225    We can't resolve references to the GOT or the PLT when creating the
 226    object file, since these tables are only created by the linker.
 227    Also, if the symbol is global, weak, common or not defined, the
 228    assembler can't compute the appropriate reloc, since its location
 229    can only be determined at link time.  */
 230
 231 #define TC_FORCE_RELOCATION_LOCAL(FIX)                  \
 232   (!(FIX)->fx_pcrel                                     \
 233    || (FIX)->fx_plt                                     \
 234    || (FIX)->fx_r_type == BFD_RELOC_32_PLT_PCREL        \
 235    || (FIX)->fx_r_type == BFD_RELOC_32_GOT_PCREL        \
 236    || (FIX)->fx_r_type == BFD_RELOC_SH_GOTPC            \
 237    || TC_FORCE_RELOCATION (FIX))
 238
 239 #define TC_FORCE_RELOCATION_SUB_LOCAL(FIX) (sh_relax && SWITCH_TABLE (FIX))
 240
 241 /* This keeps the subtracted symbol around, for use by PLT_PCREL
 242    relocs.  */
 243 #define TC_FORCE_RELOCATION_SUB_ABS(FIX)                \
 244   ((FIX)->fx_r_type == BFD_RELOC_32_PLT_PCREL)
 245
 246 /* Don't complain when we leave fx_subsy around.  */
 247 #undef TC_VALIDATE_FIX_SUB
 248 #define TC_VALIDATE_FIX_SUB(FIX)                        \
 249   ((FIX)->fx_r_type == BFD_RELOC_32_PLT_PCREL           \
 250    || (sh_relax && SWITCH_TABLE (FIX)))
 251
 252 #define md_parse_name(name, exprP, nextcharP) \
 253   sh_parse_name ((name), (exprP), (nextcharP))
 254 int sh_parse_name PARAMS ((char const *name,
 255                            expressionS *exprP,
 256                            char *nextchar));
 257
 258 #define TC_CONS_FIX_NEW(FRAG, OFF, LEN, EXP) \
 259   sh_cons_fix_new ((FRAG), (OFF), (LEN), (EXP))
 260 void sh_cons_fix_new PARAMS ((fragS *, int, int, expressionS *));
 261
 262 /* This is used to construct expressions out of @GOTOFF, @PLT and @GOT
 263    symbols.  The relocation type is stored in X_md.  */
 264 #define O_PIC_reloc O_md1
 265
 266 #endif /* OBJ_ELF */