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    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, SEG)          \
  89   (! SEG_NORMAL (SEG)                                   \
  90    || (sh_relax && SWITCH_TABLE (FIX)))
  91
  92 /* Don't complain when we leave fx_subsy around.  */
  93 #define TC_VALIDATE_FIX_SUB(FIX)                        \
  94   (sh_relax && SWITCH_TABLE (FIX))
  95
  96 #define MD_PCREL_FROM_SECTION(FIX, SEC) md_pcrel_from_section (FIX, SEC)
  97 extern long md_pcrel_from_section PARAMS ((struct fix *, segT));
  98
  99 #define IGNORE_NONSTANDARD_ESCAPES
 100
 101 #define LISTING_HEADER \
 102   (!target_big_endian \
 103    ? "Hitachi Super-H GAS Little Endian" : "Hitachi Super-H GAS Big Endian")
 104
 105 #define md_operand(x)
 106
 107 extern const struct relax_type md_relax_table[];
 108 #define TC_GENERIC_RELAX_TABLE md_relax_table
 109
 110 /* We record, for each section, whether we have most recently output a
 111    CODE reloc or a DATA reloc.  */
 112 struct sh_segment_info_type
 113 {
 114   int in_code : 1;
 115 };
 116 #define TC_SEGMENT_INFO_TYPE struct sh_segment_info_type
 117
 118 /* We call a routine to emit a reloc for a label, so that the linker
 119    can align loads and stores without crossing a label.  */
 120 extern void sh_frob_label PARAMS ((void));
 121 #define tc_frob_label(sym) sh_frob_label ()
 122
 123 /* We call a routine to flush pending output in order to output a DATA
 124    reloc when required.  */
 125 extern void sh_flush_pending_output PARAMS ((void));
 126 #define md_flush_pending_output() sh_flush_pending_output ()
 127
 128 #ifdef BFD_ASSEMBLER
 129 #define tc_frob_file_before_adjust sh_frob_file
 130 #else
 131 #define tc_frob_file sh_frob_file
 132 #endif
 133 extern void sh_frob_file PARAMS ((void));
 134
 135
 136 #ifdef OBJ_COFF
 137 /* COFF specific definitions.  */
 138
 139 #define DO_NOT_STRIP 0
 140
 141 /* This macro translates between an internal fix and an coff reloc type */
 142 #define TC_COFF_FIX2RTYPE(fix) ((fix)->fx_r_type)
 143
 144 #define BFD_ARCH TARGET_ARCH
 145
 146 #define COFF_MAGIC (!target_big_endian ? SH_ARCH_MAGIC_LITTLE : SH_ARCH_MAGIC_BIG)
 147
 148 /* We need to write out relocs which have not been completed.  */
 149 #define TC_COUNT_RELOC(fix) ((fix)->fx_addsy != NULL)
 150
 151 #define TC_RELOC_MANGLE(seg, fix, int, paddr) \
 152   sh_coff_reloc_mangle ((seg), (fix), (int), (paddr))
 153 extern void sh_coff_reloc_mangle
 154   PARAMS ((struct segment_info_struct *, struct fix *,
 155            struct internal_reloc *, unsigned int));
 156
 157 #define tc_coff_symbol_emit_hook(a) ; /* not used */
 158
 159 #define NEED_FX_R_TYPE 1
 160
 161 #define TC_KEEP_FX_OFFSET 1
 162
 163 #define TC_COFF_SIZEMACHDEP(frag) tc_coff_sizemachdep(frag)
 164 extern int tc_coff_sizemachdep PARAMS ((fragS *));
 165
 166 #ifdef BFD_ASSEMBLER
 167 #define SEG_NAME(SEG) segment_name (SEG)
 168 #else
 169 #define SEG_NAME(SEG) obj_segment_name (SEG)
 170 #endif
 171
 172 /* We align most sections to a 16 byte boundary.  */
 173 #define SUB_SEGMENT_ALIGN(SEG, FRCHAIN)                 \
 174   (strncmp (SEG_NAME (SEG), ".stabstr", 8) == 0         \
 175    ? 0                                                  \
 176    : ((strncmp (SEG_NAME (SEG), ".stab", 5) == 0        \
 177        || strcmp (SEG_NAME (SEG), ".ctors") == 0        \
 178        || strcmp (SEG_NAME (SEG), ".dtors") == 0)       \
 179       ? 2                                               \
 180       : (sh_small ? 2 : 4)))
 181
 182 #endif /* OBJ_COFF */
 183
 184 #ifdef OBJ_ELF
 185 /* ELF specific definitions.  */
 186
 187 /* Whether or not the target is big endian */
 188 extern int target_big_endian;
 189 #ifdef TE_LINUX
 190 #define TARGET_FORMAT (!target_big_endian ? "elf32-sh-linux" : "elf32-shbig-linux")
 191 #elif defined(TE_NetBSD)
 192 #define TARGET_FORMAT (!target_big_endian ? "elf32-shl-nbsd" : "elf32-sh-nbsd")
 193 #else
 194 #define TARGET_FORMAT (!target_big_endian ? "elf32-shl" : "elf32-sh")
 195 #endif
 196
 197 #define elf_tc_final_processing sh_elf_final_processing
 198 extern void sh_elf_final_processing PARAMS ((void));
 199
 200 #define DIFF_EXPR_OK            /* foo-. gets turned into PC relative relocs */
 201
 202 #define GLOBAL_OFFSET_TABLE_NAME "_GLOBAL_OFFSET_TABLE_"
 203
 204 /* This is the relocation type for direct references to
 205    GLOBAL_OFFSET_TABLE.  It comes up in complicated expressions such
 206    as _GLOBAL_OFFSET_TABLE_+[.-.L284], which cannot be expressed
 207    normally with the regular expressions.  The fixup specified here
 208    when used at runtime implies that we should add the address of the
 209    GOT to the specified location, and as a result we have simplified
 210    the expression into something we can use.  */
 211 #define TC_RELOC_GLOBAL_OFFSET_TABLE BFD_RELOC_SH_GOTPC
 212
 213 #define tc_fix_adjustable(FIX) sh_fix_adjustable(FIX)
 214 extern bfd_boolean sh_fix_adjustable PARAMS ((struct fix *));
 215
 216 /* Values passed to md_apply_fix3 don't include symbol values.  */
 217 #define MD_APPLY_SYM_VALUE(FIX) 0
 218
 219 /* This expression evaluates to true if the relocation is for a local object
 220    for which we still want to do the relocation at runtime.  False if we
 221    are willing to perform this relocation while building the .o file.
 222
 223    We can't resolve references to the GOT or the PLT when creating the
 224    object file, since these tables are only created by the linker.
 225    Also, if the symbol is global, weak, common or not defined, the
 226    assembler can't compute the appropriate reloc, since its location
 227    can only be determined at link time.  */
 228
 229 #define TC_FORCE_RELOCATION_LOCAL(FIX)                  \
 230   (!(FIX)->fx_pcrel                                     \
 231    || (FIX)->fx_plt                                     \
 232    || (FIX)->fx_r_type == BFD_RELOC_32_PLT_PCREL        \
 233    || (FIX)->fx_r_type == BFD_RELOC_32_GOT_PCREL        \
 234    || (FIX)->fx_r_type == BFD_RELOC_SH_GOTPC            \
 235    || TC_FORCE_RELOCATION (FIX))
 236
 237 /* This keeps the subtracted symbol around, for use by PLT_PCREL
 238    relocs.  */
 239 #define TC_FORCE_RELOCATION_SUB_ABS(FIX)                \
 240   ((FIX)->fx_r_type == BFD_RELOC_32_PLT_PCREL           \
 241    || S_FORCE_RELOC ((FIX)->fx_subsy))
 242
 243 /* Don't complain when we leave fx_subsy around.  */
 244 #undef TC_VALIDATE_FIX_SUB
 245 #define TC_VALIDATE_FIX_SUB(FIX)                        \
 246   ((FIX)->fx_r_type == BFD_RELOC_32_PLT_PCREL           \
 247    || (sh_relax && SWITCH_TABLE (FIX)))
 248
 249 #define md_parse_name(name, exprP, nextcharP) \
 250   sh_parse_name ((name), (exprP), (nextcharP))
 251 int sh_parse_name PARAMS ((char const *name,
 252                            expressionS *exprP,
 253                            char *nextchar));
 254
 255 #define TC_CONS_FIX_NEW(FRAG, OFF, LEN, EXP) \
 256   sh_cons_fix_new ((FRAG), (OFF), (LEN), (EXP))
 257 void sh_cons_fix_new PARAMS ((fragS *, int, int, expressionS *));
 258
 259 /* This is used to construct expressions out of @GOTOFF, @PLT and @GOT
 260    symbols.  The relocation type is stored in X_md.  */
 261 #define O_PIC_reloc O_md1
 262
 263 #endif /* OBJ_ELF */