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, 51 Franklin Street - Fifth Floor,
  20    Boston, MA 02110-1301, 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 /* This macro translates between an internal fix and a coff reloc type.  */
 139 #define TC_COFF_FIX2RTYPE(fix) ((fix)->fx_r_type)
 140
 141 #define BFD_ARCH TARGET_ARCH
 142
 143 #define COFF_MAGIC (!target_big_endian ? SH_ARCH_MAGIC_LITTLE : SH_ARCH_MAGIC_BIG)
 144
 145 /* We need to write out relocs which have not been completed.  */
 146 #define TC_COUNT_RELOC(fix) ((fix)->fx_addsy != NULL)
 147
 148 #define TC_RELOC_MANGLE(seg, fix, int, paddr) \
 149   sh_coff_reloc_mangle ((seg), (fix), (int), (paddr))
 150 extern void sh_coff_reloc_mangle
 151   (struct segment_info_struct *, struct fix *,
 152    struct internal_reloc *, unsigned int);
 153
 154 #define tc_coff_symbol_emit_hook(a) ; /* not used */
 155
 156 #define NEED_FX_R_TYPE 1
 157
 158 #define TC_KEEP_FX_OFFSET 1
 159
 160 #define TC_COFF_SIZEMACHDEP(frag) tc_coff_sizemachdep(frag)
 161 extern int tc_coff_sizemachdep (fragS *);
 162
 163 #ifdef BFD_ASSEMBLER
 164 #define SEG_NAME(SEG) segment_name (SEG)
 165 #else
 166 #define SEG_NAME(SEG) obj_segment_name (SEG)
 167 #endif
 168
 169 /* We align most sections to a 16 byte boundary.  */
 170 #define SUB_SEGMENT_ALIGN(SEG, FRCHAIN)                 \
 171   (strncmp (SEG_NAME (SEG), ".stabstr", 8) == 0         \
 172    ? 0                                                  \
 173    : ((strncmp (SEG_NAME (SEG), ".stab", 5) == 0        \
 174        || strcmp (SEG_NAME (SEG), ".ctors") == 0        \
 175        || strcmp (SEG_NAME (SEG), ".dtors") == 0)       \
 176       ? 2                                               \
 177       : (sh_small ? 2 : 4)))
 178
 179 #endif /* OBJ_COFF */
 180
 181 #ifdef OBJ_ELF
 182 /* ELF specific definitions.  */
 183
 184 /* Whether or not the target is big endian */
 185 extern int target_big_endian;
 186 #ifdef TE_LINUX
 187 #define TARGET_FORMAT (!target_big_endian ? "elf32-sh-linux" : "elf32-shbig-linux")
 188 #elif defined(TE_NetBSD)
 189 #define TARGET_FORMAT (!target_big_endian ? "elf32-shl-nbsd" : "elf32-sh-nbsd")
 190 #elif defined TARGET_SYMBIAN
 191 #define TARGET_FORMAT (!target_big_endian ? "elf32-shl-symbian" : "elf32-sh-symbian")
 192 #else
 193 #define TARGET_FORMAT (!target_big_endian ? "elf32-shl" : "elf32-sh")
 194 #endif
 195
 196 #define elf_tc_final_processing sh_elf_final_processing
 197 extern void sh_elf_final_processing (void);
 198
 199 #define DIFF_EXPR_OK            /* foo-. gets turned into PC relative relocs */
 200
 201 #define GLOBAL_OFFSET_TABLE_NAME "_GLOBAL_OFFSET_TABLE_"
 202
 203 /* This is the relocation type for direct references to
 204    GLOBAL_OFFSET_TABLE.  It comes up in complicated expressions such
 205    as _GLOBAL_OFFSET_TABLE_+[.-.L284], which cannot be expressed
 206    normally with the regular expressions.  The fixup specified here
 207    when used at runtime implies that we should add the address of the
 208    GOT to the specified location, and as a result we have simplified
 209    the expression into something we can use.  */
 210 #define TC_RELOC_GLOBAL_OFFSET_TABLE BFD_RELOC_SH_GOTPC
 211
 212 #define tc_fix_adjustable(FIX) sh_fix_adjustable(FIX)
 213 extern bfd_boolean sh_fix_adjustable (struct fix *);
 214
 215 /* Values passed to md_apply_fix3 don't include symbol values.  */
 216 #define MD_APPLY_SYM_VALUE(FIX) 0
 217
 218 /* This expression evaluates to true if the relocation is for a local object
 219    for which we still want to do the relocation at runtime.  False if we
 220    are willing to perform this relocation while building the .o file.
 221
 222    We can't resolve references to the GOT or the PLT when creating the
 223    object file, since these tables are only created by the linker.
 224    Also, if the symbol is global, weak, common or not defined, the
 225    assembler can't compute the appropriate reloc, since its location
 226    can only be determined at link time.  */
 227
 228 #define TC_FORCE_RELOCATION_LOCAL(FIX)                  \
 229   (!(FIX)->fx_pcrel                                     \
 230    || (FIX)->fx_plt                                     \
 231    || (FIX)->fx_r_type == BFD_RELOC_32_PLT_PCREL        \
 232    || (FIX)->fx_r_type == BFD_RELOC_32_GOT_PCREL        \
 233    || (FIX)->fx_r_type == BFD_RELOC_SH_GOTPC            \
 234    || TC_FORCE_RELOCATION (FIX))
 235
 236 #define TC_FORCE_RELOCATION_SUB_LOCAL(FIX) (sh_relax && SWITCH_TABLE (FIX))
 237
 238 /* This keeps the subtracted symbol around, for use by PLT_PCREL
 239    relocs.  */
 240 #define TC_FORCE_RELOCATION_SUB_ABS(FIX)                \
 241   ((FIX)->fx_r_type == BFD_RELOC_32_PLT_PCREL)
 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 (char const *name, expressionS *exprP, char *nextchar);
 252
 253 #define TC_CONS_FIX_NEW(FRAG, OFF, LEN, EXP) \
 254   sh_cons_fix_new ((FRAG), (OFF), (LEN), (EXP))
 255 void sh_cons_fix_new (fragS *, int, int, expressionS *);
 256
 257 /* This is used to construct expressions out of @GOTOFF, @PLT and @GOT
 258    symbols.  The relocation type is stored in X_md.  */
 259 #define O_PIC_reloc O_md1
 260
 261 #define TARGET_USE_CFIPOP 1
 262
 263 #define tc_cfi_frame_initial_instructions sh_cfi_frame_initial_instructions
 264 extern void sh_cfi_frame_initial_instructions (void);
 265
 266 #define tc_regname_to_dw2regnum sh_regname_to_dw2regnum
 267 extern int sh_regname_to_dw2regnum (const char *regname);
 268
 269 /* All SH instructions are multiples of 16 bits.  */
 270 #define DWARF2_LINE_MIN_INSN_LENGTH 2
 271 #define DWARF2_DEFAULT_RETURN_COLUMN 17
 272 #define DWARF2_CIE_DATA_ALIGNMENT -4
 273
 274 #endif /* OBJ_ELF */