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, 2005 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 /* The type fixS is defined (to struct fix) in write.h, but write.h uses
  27    definitions from this file.  To avoid problems with including write.h
  28    after the "right" definitions, don't; just forward-declare struct fix
  29    here.  */
  30 struct fix;
  31 struct segment_info_struct;
  32 struct internal_reloc;
  33
  34 /* Whether -relax was used.  */
  35 extern int sh_relax;
  36
  37 /* Whether -small was used.  */
  38 extern int sh_small;
  39
  40 /* Don't try to break words.  */
  41 #define WORKING_DOT_WORD
  42
  43 /* We require .long, et. al., to be aligned correctly.  */
  44 #define md_cons_align(nbytes) sh_cons_align (nbytes)
  45 extern void sh_cons_align (int);
  46
  47 /* When relaxing, we need to generate relocations for alignment
  48    directives.  */
  49 #define HANDLE_ALIGN(frag) sh_handle_align (frag)
  50 extern void sh_handle_align (fragS *);
  51
  52 #define MAX_MEM_FOR_RS_ALIGN_CODE (1 + 2)
  53
  54 /* We need to force out some relocations when relaxing.  */
  55 #define TC_FORCE_RELOCATION(fix) sh_force_relocation (fix)
  56 extern int sh_force_relocation (struct fix *);
  57
  58 /* This macro decides whether a particular reloc is an entry in a
  59    switch table.  It is used when relaxing, because the linker needs
  60    to know about all such entries so that it can adjust them if
  61    necessary.  */
  62
  63 #define SWITCH_TABLE(FIX)                               \
  64   ((FIX)->fx_addsy != NULL                              \
  65    && (FIX)->fx_subsy != NULL                           \
  66    && S_GET_SEGMENT ((FIX)->fx_addsy) == text_section   \
  67    && S_GET_SEGMENT ((FIX)->fx_subsy) == text_section   \
  68    && ((FIX)->fx_r_type == BFD_RELOC_32                 \
  69        || (FIX)->fx_r_type == BFD_RELOC_16              \
  70        || (FIX)->fx_r_type == BFD_RELOC_8))
  71
  72 #define TC_FORCE_RELOCATION_SUB_SAME(FIX, SEC)          \
  73   (! SEG_NORMAL (SEC)                                   \
  74    || TC_FORCE_RELOCATION (FIX)                         \
  75    || (sh_relax && SWITCH_TABLE (FIX)))
  76
  77 /* Don't complain when we leave fx_subsy around.  */
  78 #define TC_VALIDATE_FIX_SUB(FIX)                        \
  79   (sh_relax && SWITCH_TABLE (FIX))
  80
  81 #define MD_PCREL_FROM_SECTION(FIX, SEC) md_pcrel_from_section (FIX, SEC)
  82 extern long md_pcrel_from_section (struct fix *, segT);
  83
  84 #define IGNORE_NONSTANDARD_ESCAPES
  85
  86 #define LISTING_HEADER \
  87   (!target_big_endian \
  88    ? "Renesas / SuperH SH GAS Little Endian" \
  89    : "Renesas / SuperH SH GAS Big Endian")
  90
  91 #define md_operand(x)
  92
  93 extern const struct relax_type md_relax_table[];
  94 #define TC_GENERIC_RELAX_TABLE md_relax_table
  95
  96 /* We record, for each section, whether we have most recently output a
  97    CODE reloc or a DATA reloc.  */
  98 struct sh_segment_info_type
  99 {
 100   int in_code : 1;
 101 };
 102 #define TC_SEGMENT_INFO_TYPE struct sh_segment_info_type
 103
 104 /* We call a routine to emit a reloc for a label, so that the linker
 105    can align loads and stores without crossing a label.  */
 106 extern void sh_frob_label (symbolS *);
 107 #define tc_frob_label(sym) sh_frob_label (sym)
 108
 109 /* We call a routine to flush pending output in order to output a DATA
 110    reloc when required.  */
 111 extern void sh_flush_pending_output (void);
 112 #define md_flush_pending_output() sh_flush_pending_output ()
 113
 114 #define tc_frob_file_before_adjust sh_frob_file
 115 extern void sh_frob_file (void);
 116
 117
 118 #ifdef OBJ_COFF
 119 /* COFF specific definitions.  */
 120
 121 #define COFF_MAGIC (!target_big_endian ? SH_ARCH_MAGIC_LITTLE : SH_ARCH_MAGIC_BIG)
 122
 123 #define tc_coff_symbol_emit_hook(a) ; /* not used */
 124
 125 #define TC_KEEP_FX_OFFSET 1
 126
 127 #define SEG_NAME(SEG) segment_name (SEG)
 128
 129 /* We align most sections to a 16 byte boundary.  */
 130 #define SUB_SEGMENT_ALIGN(SEG, FRCHAIN)                 \
 131   (strncmp (SEG_NAME (SEG), ".stabstr", 8) == 0         \
 132    ? 0                                                  \
 133    : ((strncmp (SEG_NAME (SEG), ".stab", 5) == 0        \
 134        || strcmp (SEG_NAME (SEG), ".ctors") == 0        \
 135        || strcmp (SEG_NAME (SEG), ".dtors") == 0)       \
 136       ? 2                                               \
 137       : (sh_small ? 2 : 4)))
 138
 139 #endif /* OBJ_COFF */
 140
 141 #ifdef OBJ_ELF
 142 /* ELF specific definitions.  */
 143
 144 /* Whether or not the target is big endian */
 145 extern int target_big_endian;
 146 #ifdef TE_LINUX
 147 #define TARGET_FORMAT (!target_big_endian ? "elf32-sh-linux" : "elf32-shbig-linux")
 148 #elif defined(TE_NetBSD)
 149 #define TARGET_FORMAT (!target_big_endian ? "elf32-shl-nbsd" : "elf32-sh-nbsd")
 150 #elif defined TARGET_SYMBIAN
 151 #define TARGET_FORMAT (!target_big_endian ? "elf32-shl-symbian" : "elf32-sh-symbian")
 152 #else
 153 #define TARGET_FORMAT (!target_big_endian ? "elf32-shl" : "elf32-sh")
 154 #endif
 155
 156 #define elf_tc_final_processing sh_elf_final_processing
 157 extern void sh_elf_final_processing (void);
 158
 159 #define DIFF_EXPR_OK            /* foo-. gets turned into PC relative relocs */
 160
 161 #define GLOBAL_OFFSET_TABLE_NAME "_GLOBAL_OFFSET_TABLE_"
 162
 163 /* This is the relocation type for direct references to
 164    GLOBAL_OFFSET_TABLE.  It comes up in complicated expressions such
 165    as _GLOBAL_OFFSET_TABLE_+[.-.L284], which cannot be expressed
 166    normally with the regular expressions.  The fixup specified here
 167    when used at runtime implies that we should add the address of the
 168    GOT to the specified location, and as a result we have simplified
 169    the expression into something we can use.  */
 170 #define TC_RELOC_GLOBAL_OFFSET_TABLE BFD_RELOC_SH_GOTPC
 171
 172 #define tc_fix_adjustable(FIX) sh_fix_adjustable(FIX)
 173 extern bfd_boolean sh_fix_adjustable (struct fix *);
 174
 175 /* Values passed to md_apply_fix don't include symbol values.  */
 176 #define MD_APPLY_SYM_VALUE(FIX) 0
 177
 178 /* This expression evaluates to true if the relocation is for a local object
 179    for which we still want to do the relocation at runtime.  False if we
 180    are willing to perform this relocation while building the .o file.
 181
 182    We can't resolve references to the GOT or the PLT when creating the
 183    object file, since these tables are only created by the linker.
 184    Also, if the symbol is global, weak, common or not defined, the
 185    assembler can't compute the appropriate reloc, since its location
 186    can only be determined at link time.  */
 187
 188 #define TC_FORCE_RELOCATION_LOCAL(FIX)                  \
 189   (!(FIX)->fx_pcrel                                     \
 190    || (FIX)->fx_plt                                     \
 191    || (FIX)->fx_r_type == BFD_RELOC_32_PLT_PCREL        \
 192    || (FIX)->fx_r_type == BFD_RELOC_32_GOT_PCREL        \
 193    || (FIX)->fx_r_type == BFD_RELOC_SH_GOTPC            \
 194    || TC_FORCE_RELOCATION (FIX))
 195
 196 #define TC_FORCE_RELOCATION_SUB_LOCAL(FIX) (sh_relax && SWITCH_TABLE (FIX))
 197
 198 /* This keeps the subtracted symbol around, for use by PLT_PCREL
 199    relocs.  */
 200 #define TC_FORCE_RELOCATION_SUB_ABS(FIX)                \
 201   ((FIX)->fx_r_type == BFD_RELOC_32_PLT_PCREL)
 202
 203 /* Don't complain when we leave fx_subsy around.  */
 204 #undef TC_VALIDATE_FIX_SUB
 205 #define TC_VALIDATE_FIX_SUB(FIX)                        \
 206   ((FIX)->fx_r_type == BFD_RELOC_32_PLT_PCREL           \
 207    || (sh_relax && SWITCH_TABLE (FIX)))
 208
 209 #define md_parse_name(name, exprP, mode, nextcharP) \
 210   sh_parse_name ((name), (exprP), (mode), (nextcharP))
 211 int sh_parse_name (char const *name, expressionS *exprP,
 212                    enum expr_mode mode, char *nextchar);
 213
 214 #define TC_CONS_FIX_NEW(FRAG, OFF, LEN, EXP) \
 215   sh_cons_fix_new ((FRAG), (OFF), (LEN), (EXP))
 216 void sh_cons_fix_new (fragS *, int, int, expressionS *);
 217
 218 /* This is used to construct expressions out of @GOTOFF, @PLT and @GOT
 219    symbols.  The relocation type is stored in X_md.  */
 220 #define O_PIC_reloc O_md1
 221
 222 #define TARGET_USE_CFIPOP 1
 223
 224 #define tc_cfi_frame_initial_instructions sh_cfi_frame_initial_instructions
 225 extern void sh_cfi_frame_initial_instructions (void);
 226
 227 #define tc_regname_to_dw2regnum sh_regname_to_dw2regnum
 228 extern int sh_regname_to_dw2regnum (const char *regname);
 229
 230 /* All SH instructions are multiples of 16 bits.  */
 231 #define DWARF2_LINE_MIN_INSN_LENGTH 2
 232 #define DWARF2_DEFAULT_RETURN_COLUMN 17
 233 #define DWARF2_CIE_DATA_ALIGNMENT -4
 234
 235 #endif /* OBJ_ELF */