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, 2004 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 /* We require .long, et. al., to be aligned correctly.  */
  46 #define md_cons_align(nbytes) sh_cons_align (nbytes)
  47 extern void sh_cons_align (int);
  48
  49 /* When relaxing, we need to generate relocations for alignment
  50    directives.  */
  51 #define HANDLE_ALIGN(frag) sh_handle_align (frag)
  52 extern void sh_handle_align (fragS *);
  53
  54 #define MAX_MEM_FOR_RS_ALIGN_CODE (1 + 2)
  55
  56 /* We need to force out some relocations when relaxing.  */
  57 #define TC_FORCE_RELOCATION(fix) sh_force_relocation (fix)
  58 extern int sh_force_relocation (struct fix *);
  59
  60 /* This macro decides whether a particular reloc is an entry in a
  61    switch table.  It is used when relaxing, because the linker needs
  62    to know about all such entries so that it can adjust them if
  63    necessary.  */
  64
  65 #ifdef BFD_ASSEMBLER
  66 #define SWITCH_TABLE_CONS(FIX) (0)
  67 #else
  68 #define SWITCH_TABLE_CONS(FIX)                          \
  69   ((FIX)->fx_r_type == 0                                \
  70    && ((FIX)->fx_size == 2                              \
  71        || (FIX)->fx_size == 1                           \
  72        || (FIX)->fx_size == 4))
  73 #endif
  74
  75 #define SWITCH_TABLE(FIX)                               \
  76   ((FIX)->fx_addsy != NULL                              \
  77    && (FIX)->fx_subsy != NULL                           \
  78    && S_GET_SEGMENT ((FIX)->fx_addsy) == text_section   \
  79    && S_GET_SEGMENT ((FIX)->fx_subsy) == text_section   \
  80    && ((FIX)->fx_r_type == BFD_RELOC_32                 \
  81        || (FIX)->fx_r_type == BFD_RELOC_16              \
  82        || (FIX)->fx_r_type == BFD_RELOC_8               \
  83        || SWITCH_TABLE_CONS (FIX)))
  84
  85 #define TC_FORCE_RELOCATION_SUB_SAME(FIX, SEC)          \
  86   (! SEG_NORMAL (SEC)                                   \
  87    || TC_FORCE_RELOCATION (FIX)                         \
  88    || (sh_relax && SWITCH_TABLE (FIX)))
  89
  90 /* Don't complain when we leave fx_subsy around.  */
  91 #define TC_VALIDATE_FIX_SUB(FIX)                        \
  92   (sh_relax && SWITCH_TABLE (FIX))
  93
  94 #define MD_PCREL_FROM_SECTION(FIX, SEC) md_pcrel_from_section (FIX, SEC)
  95 extern long md_pcrel_from_section (struct fix *, segT);
  96
  97 #define IGNORE_NONSTANDARD_ESCAPES
  98
  99 #define LISTING_HEADER \
 100   (!target_big_endian \
 101    ? "Renesas / SuperH SH GAS Little Endian" \
 102    : "Renesas / SuperH SH GAS Big Endian")
 103
 104 #define md_operand(x)
 105
 106 extern const struct relax_type md_relax_table[];
 107 #define TC_GENERIC_RELAX_TABLE md_relax_table
 108
 109 /* We record, for each section, whether we have most recently output a
 110    CODE reloc or a DATA reloc.  */
 111 struct sh_segment_info_type
 112 {
 113   int in_code : 1;
 114 };
 115 #define TC_SEGMENT_INFO_TYPE struct sh_segment_info_type
 116
 117 /* We call a routine to emit a reloc for a label, so that the linker
 118    can align loads and stores without crossing a label.  */
 119 extern void sh_frob_label (void);
 120 #define tc_frob_label(sym) sh_frob_label ()
 121
 122 /* We call a routine to flush pending output in order to output a DATA
 123    reloc when required.  */
 124 extern void sh_flush_pending_output (void);
 125 #define md_flush_pending_output() sh_flush_pending_output ()
 126
 127 #ifdef BFD_ASSEMBLER
 128 #define tc_frob_file_before_adjust sh_frob_file
 129 #else
 130 #define tc_frob_file sh_frob_file
 131 #endif
 132 extern void sh_frob_file (void);
 133
 134
 135 #ifdef OBJ_COFF
 136 /* COFF specific definitions.  */
 137
 138 #define DO_NOT_STRIP 0
 139
 140 /* This macro translates between an internal fix and a coff reloc type.  */
 141 #define TC_COFF_FIX2RTYPE(fix) ((fix)->fx_r_type)
 142
 143 #define BFD_ARCH TARGET_ARCH
 144
 145 #define COFF_MAGIC (!target_big_endian ? SH_ARCH_MAGIC_LITTLE : SH_ARCH_MAGIC_BIG)
 146
 147 /* We need to write out relocs which have not been completed.  */
 148 #define TC_COUNT_RELOC(fix) ((fix)->fx_addsy != NULL)
 149
 150 #define TC_RELOC_MANGLE(seg, fix, int, paddr) \
 151   sh_coff_reloc_mangle ((seg), (fix), (int), (paddr))
 152 extern void sh_coff_reloc_mangle
 153   (struct segment_info_struct *, struct fix *,
 154    struct internal_reloc *, unsigned int);
 155
 156 #define tc_coff_symbol_emit_hook(a) ; /* not used */
 157
 158 #define NEED_FX_R_TYPE 1
 159
 160 #define TC_KEEP_FX_OFFSET 1
 161
 162 #define TC_COFF_SIZEMACHDEP(frag) tc_coff_sizemachdep(frag)
 163 extern int tc_coff_sizemachdep (fragS *);
 164
 165 #ifdef BFD_ASSEMBLER
 166 #define SEG_NAME(SEG) segment_name (SEG)
 167 #else
 168 #define SEG_NAME(SEG) obj_segment_name (SEG)
 169 #endif
 170
 171 /* We align most sections to a 16 byte boundary.  */
 172 #define SUB_SEGMENT_ALIGN(SEG, FRCHAIN)                 \
 173   (strncmp (SEG_NAME (SEG), ".stabstr", 8) == 0         \
 174    ? 0                                                  \
 175    : ((strncmp (SEG_NAME (SEG), ".stab", 5) == 0        \
 176        || strcmp (SEG_NAME (SEG), ".ctors") == 0        \
 177        || strcmp (SEG_NAME (SEG), ".dtors") == 0)       \
 178       ? 2                                               \
 179       : (sh_small ? 2 : 4)))
 180
 181 #endif /* OBJ_COFF */
 182
 183 #ifdef OBJ_ELF
 184 /* ELF specific definitions.  */
 185
 186 /* Whether or not the target is big endian */
 187 extern int target_big_endian;
 188 #ifdef TE_LINUX
 189 #define TARGET_FORMAT (!target_big_endian ? "elf32-sh-linux" : "elf32-shbig-linux")
 190 #elif defined(TE_NetBSD)
 191 #define TARGET_FORMAT (!target_big_endian ? "elf32-shl-nbsd" : "elf32-sh-nbsd")
 192 #elif defined TARGET_SYMBIAN
 193 #define TARGET_FORMAT (!target_big_endian ? "elf32-shl-symbian" : "elf32-sh-symbian")
 194 #else
 195 #define TARGET_FORMAT (!target_big_endian ? "elf32-shl" : "elf32-sh")
 196 #endif
 197
 198 #define elf_tc_final_processing sh_elf_final_processing
 199 extern void sh_elf_final_processing (void);
 200
 201 #define DIFF_EXPR_OK            /* foo-. gets turned into PC relative relocs */
 202
 203 #define GLOBAL_OFFSET_TABLE_NAME "_GLOBAL_OFFSET_TABLE_"
 204
 205 /* This is the relocation type for direct references to
 206    GLOBAL_OFFSET_TABLE.  It comes up in complicated expressions such
 207    as _GLOBAL_OFFSET_TABLE_+[.-.L284], which cannot be expressed
 208    normally with the regular expressions.  The fixup specified here
 209    when used at runtime implies that we should add the address of the
 210    GOT to the specified location, and as a result we have simplified
 211    the expression into something we can use.  */
 212 #define TC_RELOC_GLOBAL_OFFSET_TABLE BFD_RELOC_SH_GOTPC
 213
 214 #define tc_fix_adjustable(FIX) sh_fix_adjustable(FIX)
 215 extern bfd_boolean sh_fix_adjustable (struct fix *);
 216
 217 /* Values passed to md_apply_fix3 don't include symbol values.  */
 218 #define MD_APPLY_SYM_VALUE(FIX) 0
 219
 220 /* This expression evaluates to true if the relocation is for a local object
 221    for which we still want to do the relocation at runtime.  False if we
 222    are willing to perform this relocation while building the .o file.
 223
 224    We can't resolve references to the GOT or the PLT when creating the
 225    object file, since these tables are only created by the linker.
 226    Also, if the symbol is global, weak, common or not defined, the
 227    assembler can't compute the appropriate reloc, since its location
 228    can only be determined at link time.  */
 229
 230 #define TC_FORCE_RELOCATION_LOCAL(FIX)                  \
 231   (!(FIX)->fx_pcrel                                     \
 232    || (FIX)->fx_plt                                     \
 233    || (FIX)->fx_r_type == BFD_RELOC_32_PLT_PCREL        \
 234    || (FIX)->fx_r_type == BFD_RELOC_32_GOT_PCREL        \
 235    || (FIX)->fx_r_type == BFD_RELOC_SH_GOTPC            \
 236    || TC_FORCE_RELOCATION (FIX))
 237
 238 #define TC_FORCE_RELOCATION_SUB_LOCAL(FIX) (sh_relax && SWITCH_TABLE (FIX))
 239
 240 /* This keeps the subtracted symbol around, for use by PLT_PCREL
 241    relocs.  */
 242 #define TC_FORCE_RELOCATION_SUB_ABS(FIX)                \
 243   ((FIX)->fx_r_type == BFD_RELOC_32_PLT_PCREL)
 244
 245 /* Don't complain when we leave fx_subsy around.  */
 246 #undef TC_VALIDATE_FIX_SUB
 247 #define TC_VALIDATE_FIX_SUB(FIX)                        \
 248   ((FIX)->fx_r_type == BFD_RELOC_32_PLT_PCREL           \
 249    || (sh_relax && SWITCH_TABLE (FIX)))
 250
 251 #define md_parse_name(name, exprP, nextcharP) \
 252   sh_parse_name ((name), (exprP), (nextcharP))
 253 int sh_parse_name (char const *name, expressionS *exprP, 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 (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 #define TARGET_USE_CFIPOP 1
 264
 265 #define tc_cfi_frame_initial_instructions sh_cfi_frame_initial_instructions
 266 extern void sh_cfi_frame_initial_instructions (void);
 267
 268 #define tc_regname_to_dw2regnum sh_regname_to_dw2regnum
 269 extern int sh_regname_to_dw2regnum (const char *regname);
 270
 271 /* All SH instructions are multiples of 16 bits.  */
 272 #define DWARF2_LINE_MIN_INSN_LENGTH 2
 273 #define DWARF2_DEFAULT_RETURN_COLUMN 17
 274 #define DWARF2_CIE_DATA_ALIGNMENT -4
 275
 276 #endif /* OBJ_ELF */