gas/config/tc-sh.h

   1 /* This file is tc-sh.h
   2    Copyright (C) 1993-2024 Free Software Foundation, Inc.
   3
   4    This file is part of GAS, the GNU Assembler.
   5
   6    GAS is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3, or (at your option)
   9    any later version.
  10
  11    GAS is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with GAS; see the file COPYING.  If not, write to
  18    the Free Software Foundation, 51 Franklin Street - Fifth Floor,
  19    Boston, MA 02110-1301, USA.  */
  20
  21 #define TC_SH
  22
  23 #define TARGET_ARCH bfd_arch_sh
  24
  25 /* The type fixS is defined (to struct fix) in write.h, but write.h uses
  26    definitions from this file.  To avoid problems with including write.h
  27    after the "right" definitions, don't; just forward-declare struct fix
  28    here.  */
  29 struct fix;
  30 struct segment_info_struct;
  31 struct internal_reloc;
  32
  33 /* Whether -relax was used.  */
  34 extern int sh_relax;
  35
  36 /* Whether -small was used.  */
  37 extern int sh_small;
  38
  39 /* Don't try to break words.  */
  40 #define WORKING_DOT_WORD
  41
  42 /* We require .long, et. al., to be aligned correctly.  */
  43 #define md_cons_align(nbytes) sh_cons_align (nbytes)
  44 extern void sh_cons_align (int);
  45
  46 /* We need to optimize expr with taking account of rs_align_test
  47    frags.  */
  48
  49 #ifdef OBJ_ELF
  50 #define md_optimize_expr(l,o,r) sh_optimize_expr (l, o, r)
  51 extern int sh_optimize_expr (expressionS *, operatorT, expressionS *);
  52 #endif
  53
  54 /* When relaxing, we need to generate relocations for alignment
  55    directives.  */
  56 #define HANDLE_ALIGN(frag) sh_handle_align (frag)
  57 extern void sh_handle_align (fragS *);
  58
  59 #define MAX_MEM_FOR_RS_ALIGN_CODE (1 + 2)
  60
  61 /* We need to force out some relocations when relaxing.  */
  62 #define TC_FORCE_RELOCATION(fix) sh_force_relocation (fix)
  63 extern int sh_force_relocation (struct fix *);
  64
  65 /* This macro decides whether a particular reloc is an entry in a
  66    switch table.  It is used when relaxing, because the linker needs
  67    to know about all such entries so that it can adjust them if
  68    necessary.  */
  69
  70 #define SWITCH_TABLE(FIX)                               \
  71   ((FIX)->fx_addsy != NULL                              \
  72    && (FIX)->fx_subsy != NULL                           \
  73    && S_GET_SEGMENT ((FIX)->fx_addsy) == text_section   \
  74    && S_GET_SEGMENT ((FIX)->fx_subsy) == text_section   \
  75    && ((FIX)->fx_r_type == BFD_RELOC_32                 \
  76        || (FIX)->fx_r_type == BFD_RELOC_16              \
  77        || (FIX)->fx_r_type == BFD_RELOC_8))
  78
  79 #define TC_FORCE_RELOCATION_SUB_SAME(FIX, SEC)          \
  80   (GENERIC_FORCE_RELOCATION_SUB_SAME (FIX, SEC)         \
  81    || TC_FORCE_RELOCATION (FIX)                         \
  82    || (sh_relax && SWITCH_TABLE (FIX)))
  83
  84 /* Don't complain when we leave fx_subsy around.  */
  85 #define TC_VALIDATE_FIX_SUB(FIX, SEG)                   \
  86   ((md_register_arithmetic || (SEG) != reg_section)     \
  87    && sh_relax && SWITCH_TABLE (FIX))
  88
  89 #define MD_PCREL_FROM_SECTION(FIX, SEC) md_pcrel_from_section (FIX, SEC)
  90
  91 /* SH_COUNT relocs are allowed outside of frag.
  92    The target is also buggy and sets fix size too large for other relocs.  */
  93 #define TC_FX_SIZE_SLACK(FIX) \
  94   ((FIX)->fx_r_type == BFD_RELOC_SH_COUNT ? -1 : 2)
  95
  96 #define IGNORE_NONSTANDARD_ESCAPES
  97
  98 #define LISTING_HEADER \
  99   (!target_big_endian \
 100    ? "Renesas / SuperH SH GAS Little Endian" \
 101    : "Renesas / SuperH SH GAS Big Endian")
 102
 103 #define md_operand(x)
 104
 105 extern const struct relax_type md_relax_table[];
 106 #define TC_GENERIC_RELAX_TABLE md_relax_table
 107
 108 /* We record, for each section, whether we have most recently output a
 109    CODE reloc or a DATA reloc.  */
 110 struct sh_segment_info_type
 111 {
 112   int in_code : 1;
 113 };
 114 #define TC_SEGMENT_INFO_TYPE struct sh_segment_info_type
 115
 116 /* We call a routine to emit a reloc for a label, so that the linker
 117    can align loads and stores without crossing a label.  */
 118 extern void sh_frob_label (symbolS *);
 119 #define tc_frob_label(sym) sh_frob_label (sym)
 120
 121 /* We call a routine to flush pending output in order to output a DATA
 122    reloc when required.  */
 123 extern void sh_flush_pending_output (void);
 124 #define md_flush_pending_output() sh_flush_pending_output ()
 125
 126 #define tc_frob_file_before_adjust sh_frob_file
 127 extern void sh_frob_file (void);
 128
 129
 130 #ifdef OBJ_COFF
 131 /* COFF specific definitions.  */
 132
 133 #define tc_coff_symbol_emit_hook(a) ; /* Not used.  */
 134
 135 #define TC_KEEP_FX_OFFSET 1
 136
 137 #define SEG_NAME(SEG) segment_name (SEG)
 138
 139 /* We align most sections to a 16 byte boundary.  */
 140 #define SUB_SEGMENT_ALIGN(SEG, FRCHAIN)                 \
 141   (startswith (SEG_NAME (SEG), ".stabstr")              \
 142    ? 0                                                  \
 143    : ((startswith (SEG_NAME (SEG), ".stab")     \
 144        || strcmp (SEG_NAME (SEG), ".ctors") == 0        \
 145        || strcmp (SEG_NAME (SEG), ".dtors") == 0)       \
 146       ? 2                                               \
 147       : (sh_small ? 2 : 4)))
 148
 149 #endif /* OBJ_COFF */
 150
 151 #ifdef OBJ_ELF
 152 /* ELF specific definitions.  */
 153
 154 /* Whether or not the target is big endian.  */
 155 extern int target_big_endian;
 156 #ifdef TE_LINUX
 157 #define TARGET_FORMAT (!target_big_endian ? "elf32-sh-linux" : "elf32-shbig-linux")
 158 #elif defined(TE_NetBSD)
 159 #define TARGET_FORMAT (!target_big_endian ? "elf32-shl-nbsd" : "elf32-sh-nbsd")
 160 #elif defined (TE_VXWORKS)
 161 #define TARGET_FORMAT (!target_big_endian ? "elf32-shl-vxworks" : "elf32-sh-vxworks")
 162 #elif defined (TE_UCLINUX)
 163 #define TARGET_FORMAT sh_uclinux_target_format ()
 164 extern const char * sh_uclinux_target_format (void);
 165 #else
 166 #define TARGET_FORMAT (!target_big_endian ? "elf32-shl" : "elf32-sh")
 167 #endif
 168
 169 #define elf_tc_final_processing sh_elf_final_processing
 170 extern void sh_elf_final_processing (void);
 171
 172 #define DIFF_EXPR_OK            /* foo-. gets turned into PC relative relocs.  */
 173
 174 #define GLOBAL_OFFSET_TABLE_NAME "_GLOBAL_OFFSET_TABLE_"
 175
 176 /* This is the relocation type for direct references to
 177    GLOBAL_OFFSET_TABLE.  It comes up in complicated expressions such
 178    as _GLOBAL_OFFSET_TABLE_+[.-.L284], which cannot be expressed
 179    normally with the regular expressions.  The fixup specified here
 180    when used at runtime implies that we should add the address of the
 181    GOT to the specified location, and as a result we have simplified
 182    the expression into something we can use.  */
 183 #define TC_RELOC_GLOBAL_OFFSET_TABLE BFD_RELOC_SH_GOTPC
 184
 185 #define tc_fix_adjustable(FIX) sh_fix_adjustable(FIX)
 186 extern bool sh_fix_adjustable (struct fix *);
 187
 188 /* Values passed to md_apply_fix don't include symbol values.  */
 189 #define MD_APPLY_SYM_VALUE(FIX) 0
 190
 191 /* This expression evaluates to true if the relocation is for a local object
 192    for which we still want to do the relocation at runtime.  False if we
 193    are willing to perform this relocation while building the .o file.
 194
 195    We can't resolve references to the GOT or the PLT when creating the
 196    object file, since these tables are only created by the linker.
 197    Also, if the symbol is global, weak, common or not defined, the
 198    assembler can't compute the appropriate reloc, since its location
 199    can only be determined at link time.  */
 200
 201 #define TC_FORCE_RELOCATION_LOCAL(FIX)                  \
 202   (GENERIC_FORCE_RELOCATION_LOCAL (FIX)                 \
 203    || (FIX)->fx_r_type == BFD_RELOC_32_PLT_PCREL        \
 204    || (FIX)->fx_r_type == BFD_RELOC_32_GOT_PCREL        \
 205    || (FIX)->fx_r_type == BFD_RELOC_SH_GOTPC)
 206
 207 #define TC_FORCE_RELOCATION_SUB_LOCAL(FIX, SEG)         \
 208   ((!md_register_arithmetic && (SEG) == reg_section)    \
 209    || (sh_relax && SWITCH_TABLE (FIX)))
 210
 211 /* This keeps the subtracted symbol around, for use by PLT_PCREL
 212    relocs.  */
 213 #define TC_FORCE_RELOCATION_SUB_ABS(FIX, SEG)           \
 214   ((FIX)->fx_r_type == BFD_RELOC_32_PLT_PCREL           \
 215    || (!md_register_arithmetic && (SEG) == reg_section))
 216
 217 /* Don't complain when we leave fx_subsy around.  */
 218 #undef TC_VALIDATE_FIX_SUB
 219 #define TC_VALIDATE_FIX_SUB(FIX, SEG)                   \
 220   ((md_register_arithmetic || (SEG) != reg_section)     \
 221    && ((FIX)->fx_r_type == BFD_RELOC_32_PLT_PCREL       \
 222        || (sh_relax && SWITCH_TABLE (FIX))))
 223
 224 #define md_parse_name(name, exprP, mode, nextcharP) \
 225   sh_parse_name ((name), (exprP), (mode), (nextcharP))
 226 int sh_parse_name (char const *, expressionS *,
 227                    enum expr_mode, char *);
 228
 229 #define TC_CONS_FIX_NEW(FRAG, OFF, LEN, EXP, RELOC)     \
 230   sh_cons_fix_new ((FRAG), (OFF), (LEN), (EXP), (RELOC))
 231 void sh_cons_fix_new (fragS *, int, int, expressionS *,
 232                       bfd_reloc_code_real_type);
 233
 234 /* This is used to construct expressions out of @GOTOFF, @PLT and @GOT
 235    symbols.  The relocation type is stored in X_md.  */
 236 #define O_PIC_reloc O_md1
 237
 238 #define TARGET_USE_CFIPOP 1
 239
 240 #define tc_cfi_frame_initial_instructions sh_cfi_frame_initial_instructions
 241 extern void sh_cfi_frame_initial_instructions (void);
 242
 243 #define tc_regname_to_dw2regnum sh_regname_to_dw2regnum
 244 extern int sh_regname_to_dw2regnum (char *);
 245
 246 /* All SH instructions are multiples of 16 bits.  */
 247 #define DWARF2_LINE_MIN_INSN_LENGTH 2
 248 #define DWARF2_DEFAULT_RETURN_COLUMN 17
 249 #define DWARF2_CIE_DATA_ALIGNMENT (-4)
 250
 251 #endif /* OBJ_ELF */
 252
 253 #define H_TICK_HEX 1