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, 2006, 2007 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 3, 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 /* We need to optimize expr with taking account of rs_align_test
  48    frags.  */
  49
  50 #ifdef OBJ_ELF
  51 #define md_optimize_expr(l,o,r) sh_optimize_expr (l, o, r)
  52 extern int sh_optimize_expr (expressionS *, operatorT, expressionS *);
  53 #endif
  54
  55 /* When relaxing, we need to generate relocations for alignment
  56    directives.  */
  57 #define HANDLE_ALIGN(frag) sh_handle_align (frag)
  58 extern void sh_handle_align (fragS *);
  59
  60 #define MAX_MEM_FOR_RS_ALIGN_CODE (1 + 2)
  61
  62 /* We need to force out some relocations when relaxing.  */
  63 #define TC_FORCE_RELOCATION(fix) sh_force_relocation (fix)
  64 extern int sh_force_relocation (struct fix *);
  65
  66 /* This macro decides whether a particular reloc is an entry in a
  67    switch table.  It is used when relaxing, because the linker needs
  68    to know about all such entries so that it can adjust them if
  69    necessary.  */
  70
  71 #define SWITCH_TABLE(FIX)                               \
  72   ((FIX)->fx_addsy != NULL                              \
  73    && (FIX)->fx_subsy != NULL                           \
  74    && S_GET_SEGMENT ((FIX)->fx_addsy) == text_section   \
  75    && S_GET_SEGMENT ((FIX)->fx_subsy) == text_section   \
  76    && ((FIX)->fx_r_type == BFD_RELOC_32                 \
  77        || (FIX)->fx_r_type == BFD_RELOC_16              \
  78        || (FIX)->fx_r_type == BFD_RELOC_8))
  79
  80 #define TC_FORCE_RELOCATION_SUB_SAME(FIX, SEC)          \
  81   (! SEG_NORMAL (SEC)                                   \
  82    || TC_FORCE_RELOCATION (FIX)                         \
  83    || (sh_relax && SWITCH_TABLE (FIX)))
  84
  85 /* Don't complain when we leave fx_subsy around.  */
  86 #define TC_VALIDATE_FIX_SUB(FIX)                        \
  87   (sh_relax && SWITCH_TABLE (FIX))
  88
  89 #define MD_PCREL_FROM_SECTION(FIX, SEC) md_pcrel_from_section (FIX, SEC)
  90 extern long md_pcrel_from_section (struct fix *, segT);
  91
  92 /* SH_COUNT relocs are allowed outside of frag.
  93    The target is also buggy and sets fix size too large for other relocs.  */
  94 #define TC_FX_SIZE_SLACK(FIX) \
  95   ((FIX)->fx_r_type == BFD_RELOC_SH_COUNT ? -1 : 2)
  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 (symbolS *);
 120 #define tc_frob_label(sym) sh_frob_label (sym)
 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 #define tc_frob_file_before_adjust sh_frob_file
 128 extern void sh_frob_file (void);
 129
 130
 131 #ifdef OBJ_COFF
 132 /* COFF specific definitions.  */
 133
 134 #define COFF_MAGIC (!target_big_endian ? SH_ARCH_MAGIC_LITTLE : SH_ARCH_MAGIC_BIG)
 135
 136 #define tc_coff_symbol_emit_hook(a) ; /* not used */
 137
 138 #define TC_KEEP_FX_OFFSET 1
 139
 140 #define SEG_NAME(SEG) segment_name (SEG)
 141
 142 /* We align most sections to a 16 byte boundary.  */
 143 #define SUB_SEGMENT_ALIGN(SEG, FRCHAIN)                 \
 144   (strncmp (SEG_NAME (SEG), ".stabstr", 8) == 0         \
 145    ? 0                                                  \
 146    : ((strncmp (SEG_NAME (SEG), ".stab", 5) == 0        \
 147        || strcmp (SEG_NAME (SEG), ".ctors") == 0        \
 148        || strcmp (SEG_NAME (SEG), ".dtors") == 0)       \
 149       ? 2                                               \
 150       : (sh_small ? 2 : 4)))
 151
 152 #endif /* OBJ_COFF */
 153
 154 #ifdef OBJ_ELF
 155 /* ELF specific definitions.  */
 156
 157 /* Whether or not the target is big endian */
 158 extern int target_big_endian;
 159 #ifdef TE_LINUX
 160 #define TARGET_FORMAT (!target_big_endian ? "elf32-sh-linux" : "elf32-shbig-linux")
 161 #elif defined(TE_NetBSD)
 162 #define TARGET_FORMAT (!target_big_endian ? "elf32-shl-nbsd" : "elf32-sh-nbsd")
 163 #elif defined TARGET_SYMBIAN
 164 #define TARGET_FORMAT (!target_big_endian ? "elf32-shl-symbian" : "elf32-sh-symbian")
 165 #elif defined (TE_VXWORKS)
 166 #define TARGET_FORMAT (!target_big_endian ? "elf32-shl-vxworks" : "elf32-sh-vxworks")
 167 #else
 168 #define TARGET_FORMAT (!target_big_endian ? "elf32-shl" : "elf32-sh")
 169 #endif
 170
 171 #define elf_tc_final_processing sh_elf_final_processing
 172 extern void sh_elf_final_processing (void);
 173
 174 #define DIFF_EXPR_OK            /* foo-. gets turned into PC relative relocs */
 175
 176 #define GLOBAL_OFFSET_TABLE_NAME "_GLOBAL_OFFSET_TABLE_"
 177
 178 /* This is the relocation type for direct references to
 179    GLOBAL_OFFSET_TABLE.  It comes up in complicated expressions such
 180    as _GLOBAL_OFFSET_TABLE_+[.-.L284], which cannot be expressed
 181    normally with the regular expressions.  The fixup specified here
 182    when used at runtime implies that we should add the address of the
 183    GOT to the specified location, and as a result we have simplified
 184    the expression into something we can use.  */
 185 #define TC_RELOC_GLOBAL_OFFSET_TABLE BFD_RELOC_SH_GOTPC
 186
 187 #define tc_fix_adjustable(FIX) sh_fix_adjustable(FIX)
 188 extern bfd_boolean sh_fix_adjustable (struct fix *);
 189
 190 /* Values passed to md_apply_fix don't include symbol values.  */
 191 #define MD_APPLY_SYM_VALUE(FIX) 0
 192
 193 /* This expression evaluates to true if the relocation is for a local object
 194    for which we still want to do the relocation at runtime.  False if we
 195    are willing to perform this relocation while building the .o file.
 196
 197    We can't resolve references to the GOT or the PLT when creating the
 198    object file, since these tables are only created by the linker.
 199    Also, if the symbol is global, weak, common or not defined, the
 200    assembler can't compute the appropriate reloc, since its location
 201    can only be determined at link time.  */
 202
 203 #define TC_FORCE_RELOCATION_LOCAL(FIX)                  \
 204   (!(FIX)->fx_pcrel                                     \
 205    || (FIX)->fx_r_type == BFD_RELOC_32_PLT_PCREL        \
 206    || (FIX)->fx_r_type == BFD_RELOC_32_GOT_PCREL        \
 207    || (FIX)->fx_r_type == BFD_RELOC_SH_GOTPC            \
 208    || TC_FORCE_RELOCATION (FIX))
 209
 210 #define TC_FORCE_RELOCATION_SUB_LOCAL(FIX) (sh_relax && SWITCH_TABLE (FIX))
 211
 212 /* This keeps the subtracted symbol around, for use by PLT_PCREL
 213    relocs.  */
 214 #define TC_FORCE_RELOCATION_SUB_ABS(FIX)                \
 215   ((FIX)->fx_r_type == BFD_RELOC_32_PLT_PCREL)
 216
 217 /* Don't complain when we leave fx_subsy around.  */
 218 #undef TC_VALIDATE_FIX_SUB
 219 #define TC_VALIDATE_FIX_SUB(FIX)                        \
 220   ((FIX)->fx_r_type == BFD_RELOC_32_PLT_PCREL           \
 221    || (sh_relax && SWITCH_TABLE (FIX)))
 222
 223 #define md_parse_name(name, exprP, mode, nextcharP) \
 224   sh_parse_name ((name), (exprP), (mode), (nextcharP))
 225 int sh_parse_name (char const *name, expressionS *exprP,
 226                    enum expr_mode mode, char *nextchar);
 227
 228 #define TC_CONS_FIX_NEW(FRAG, OFF, LEN, EXP) \
 229   sh_cons_fix_new ((FRAG), (OFF), (LEN), (EXP))
 230 void sh_cons_fix_new (fragS *, int, int, expressionS *);
 231
 232 /* This is used to construct expressions out of @GOTOFF, @PLT and @GOT
 233    symbols.  The relocation type is stored in X_md.  */
 234 #define O_PIC_reloc O_md1
 235
 236 #define TARGET_USE_CFIPOP 1
 237
 238 #define tc_cfi_frame_initial_instructions sh_cfi_frame_initial_instructions
 239 extern void sh_cfi_frame_initial_instructions (void);
 240
 241 #define tc_regname_to_dw2regnum sh_regname_to_dw2regnum
 242 extern int sh_regname_to_dw2regnum (char *regname);
 243
 244 /* All SH instructions are multiples of 16 bits.  */
 245 #define DWARF2_LINE_MIN_INSN_LENGTH 2
 246 #define DWARF2_DEFAULT_RETURN_COLUMN 17
 247 #define DWARF2_CIE_DATA_ALIGNMENT (-4)
 248
 249 #endif /* OBJ_ELF */