gas/config/tc-ppc.h

   1 /* tc-ppc.h -- Header file for tc-ppc.c.
   2    Copyright (C) 1994-2020 Free Software Foundation, Inc.
   3    Written by Ian Lance Taylor, Cygnus Support.
   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 the Free
  19    Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
  20    02110-1301, USA.  */
  21
  22 #define TC_PPC
  23
  24 #include "opcode/ppc.h"
  25
  26 struct fix;
  27
  28 /* Set the endianness we are using.  Default to big endian.  */
  29 #ifndef TARGET_BYTES_BIG_ENDIAN
  30 #define TARGET_BYTES_BIG_ENDIAN 1
  31 #endif
  32
  33 /* If OBJ_COFF is defined, and TE_PE is not defined, we are assembling
  34    XCOFF for AIX or PowerMac.  If TE_PE is defined, we are assembling
  35    COFF for Windows NT.  */
  36
  37 #ifdef OBJ_COFF
  38 #ifndef TE_PE
  39 #define OBJ_XCOFF
  40 #endif
  41 #endif
  42
  43 /* The target BFD architecture.  */
  44 #define TARGET_ARCH (ppc_arch ())
  45 #define TARGET_MACH (ppc_mach ())
  46 extern enum bfd_architecture ppc_arch (void);
  47 extern unsigned long ppc_mach (void);
  48
  49 /* Whether or not the target is big endian */
  50 extern int target_big_endian;
  51
  52 /* The target BFD format.  */
  53 #define TARGET_FORMAT (ppc_target_format ())
  54 extern const char *ppc_target_format (void);
  55
  56 /* Permit temporary numeric labels.  */
  57 #define LOCAL_LABELS_FB 1
  58
  59 /* $ is used to refer to the current location.  */
  60 #define DOLLAR_DOT
  61
  62 /* Strings do not use backslash escapes under COFF.  */
  63 #ifdef OBJ_COFF
  64 #define NO_STRING_ESCAPES
  65 #endif
  66
  67 #ifdef OBJ_ELF
  68 #define DIFF_EXPR_OK            /* foo-. gets turned into PC relative relocs */
  69 #endif
  70
  71 #if TARGET_BYTES_BIG_ENDIAN
  72 #define PPC_BIG_ENDIAN 1
  73 #else
  74 #define PPC_BIG_ENDIAN 0
  75 #endif
  76
  77 /* We don't need to handle .word strangely.  */
  78 #define WORKING_DOT_WORD
  79
  80 #define MAX_MEM_FOR_RS_ALIGN_CODE 4
  81 #define HANDLE_ALIGN(FRAGP)                                             \
  82   if ((FRAGP)->fr_type == rs_align_code)                                \
  83     ppc_handle_align (FRAGP);
  84
  85 extern unsigned int ppc_nop_select (void);
  86 #define NOP_OPCODE ppc_nop_select ()
  87
  88 extern void ppc_handle_align (struct frag *);
  89 extern void ppc_frag_check (struct frag *);
  90
  91 #ifdef OBJ_ELF
  92 #define SUB_SEGMENT_ALIGN(SEG, FRCHAIN) 0
  93 #endif
  94
  95 #define md_frag_check(FRAGP) ppc_frag_check (FRAGP)
  96
  97 /* Arrange to store the value of ppc_cpu at the site of a fixup
  98    for later use in md_apply_fix.  */
  99 struct _ppc_fix_extra
 100 {
 101   ppc_cpu_t ppc_cpu;
 102 };
 103
 104 extern ppc_cpu_t ppc_cpu;
 105
 106 #define TC_FIX_TYPE struct _ppc_fix_extra
 107 #define TC_INIT_FIX_DATA(FIXP) \
 108   do { (FIXP)->tc_fix_data.ppc_cpu = ppc_cpu; } while (0)
 109 \f
 110 #ifdef TE_PE
 111
 112 /* Question marks are permitted in symbol names.  */
 113 #define LEX_QM 1
 114
 115 /* Don't adjust TOC relocs.  */
 116 #define tc_fix_adjustable(FIX) ppc_pe_fix_adjustable (FIX)
 117 extern int ppc_pe_fix_adjustable (struct fix *);
 118
 119 #endif
 120
 121 #ifdef OBJ_XCOFF
 122
 123 /* Declarations needed when generating XCOFF code.  XCOFF is an
 124    extension of COFF, used only on the RS/6000.  Rather than create an
 125    obj-xcoff, we just use obj-coff, and handle the extensions here in
 126    tc-ppc.  */
 127
 128 /* We need to keep some information for symbols.  */
 129 struct ppc_tc_sy
 130 {
 131   /* We keep a few linked lists of symbols.  */
 132   symbolS *next;
 133   /* The real name, if the symbol was renamed.  */
 134   char *real_name;
 135   /* Non-zero if the symbol should be output.  The RS/6000 assembler
 136      only outputs symbols that are external or are mentioned in a
 137      .globl or .lglobl statement.  */
 138   unsigned char output;
 139   /* The symbol class.  */
 140   short symbol_class;
 141   /* For a csect or common symbol, the alignment to use.  */
 142   unsigned char align;
 143   /* For a csect symbol, the subsegment we are using.  This is zero
 144      for symbols that are not csects.  */
 145   subsegT subseg;
 146   /* For a csect symbol, the last symbol which has been defined in
 147      this csect, or NULL if none have been defined so far.
 148      For a .bs symbol, the referenced csect symbol.
 149      For a label, the enclosing csect.  */
 150   symbolS *within;
 151   union
 152   {
 153     /* For a function symbol, a symbol whose value is the size.  The
 154        field is NULL if there is no size.  */
 155     symbolS *size;
 156     /* For a dwarf symbol, the corresponding dwarf subsection.  */
 157     struct dw_subsection *dw;
 158   } u;
 159 };
 160
 161 #define TC_SYMFIELD_TYPE struct ppc_tc_sy
 162
 163 /* We need an additional auxent for function symbols.  */
 164 #define OBJ_COFF_MAX_AUXENTRIES 2
 165
 166 /* Square and curly brackets are permitted in symbol names.  */
 167 #define LEX_BR 3
 168
 169 /* Canonicalize the symbol name.  */
 170 #define tc_canonicalize_symbol_name(name) ppc_canonicalize_symbol_name (name)
 171 extern char *ppc_canonicalize_symbol_name (char *);
 172
 173 /* Get the symbol class from the name.  */
 174 #define tc_symbol_new_hook(sym) ppc_symbol_new_hook (sym)
 175 extern void ppc_symbol_new_hook (symbolS *);
 176
 177 /* TOC relocs requires special handling.  */
 178 #define tc_fix_adjustable(FIX) ppc_fix_adjustable (FIX)
 179 extern int ppc_fix_adjustable (struct fix *);
 180
 181 /* We need to set the section VMA.  */
 182 #define tc_frob_section(sec) ppc_frob_section (sec)
 183 extern void ppc_frob_section (asection *);
 184
 185 /* Finish up the symbol.  */
 186 #define tc_frob_symbol(sym, punt) punt = ppc_frob_symbol (sym)
 187 extern int ppc_frob_symbol (symbolS *);
 188
 189 /* Finish up the entire symtab.  */
 190 #define tc_adjust_symtab() ppc_adjust_symtab ()
 191 extern void ppc_adjust_symtab (void);
 192
 193 /* We also need to copy, in particular, the class of the symbol,
 194    over what obj-coff would otherwise have copied.  */
 195 #define OBJ_COPY_SYMBOL_ATTRIBUTES(dest,src)                    \
 196 do {                                                            \
 197   if (SF_GET_GET_SEGMENT (dest))                                \
 198     S_SET_SEGMENT (dest, S_GET_SEGMENT (src));                  \
 199   symbol_get_tc (dest)->u = symbol_get_tc (src)->u;             \
 200   symbol_get_tc (dest)->align = symbol_get_tc (src)->align;     \
 201   symbol_get_tc (dest)->symbol_class = symbol_get_tc (src)->symbol_class;       \
 202   symbol_get_tc (dest)->within = symbol_get_tc (src)->within;   \
 203 } while (0)
 204
 205 extern void ppc_xcoff_end (void);
 206 #define md_end ppc_xcoff_end
 207
 208 #endif /* OBJ_XCOFF */
 209
 210 #define tc_new_dot_label(sym) ppc_new_dot_label (sym)
 211 extern void ppc_new_dot_label (symbolS *);
 212
 213 extern const char       ppc_symbol_chars[];
 214 #define tc_symbol_chars ppc_symbol_chars
 215
 216 #ifdef OBJ_ELF
 217
 218 /* Support for SHT_ORDERED */
 219 extern int ppc_section_type (char *, size_t);
 220 extern int ppc_section_flags (flagword, bfd_vma, int);
 221
 222 #define md_elf_section_type(STR, LEN)           ppc_section_type (STR, LEN)
 223 #define md_elf_section_flags(FLAGS, ATTR, TYPE) ppc_section_flags (FLAGS, ATTR, TYPE)
 224
 225 #define tc_comment_chars ppc_comment_chars
 226 extern const char *ppc_comment_chars;
 227
 228 #define md_elf_section_letter           ppc_elf_section_letter
 229 extern bfd_vma ppc_elf_section_letter (int, const char **);
 230
 231 /* Keep relocations relative to the GOT, or non-PC relative.  */
 232 #define tc_fix_adjustable(FIX) ppc_fix_adjustable (FIX)
 233 extern int ppc_fix_adjustable (struct fix *);
 234
 235 /* Values passed to md_apply_fix don't include symbol values.  */
 236 #define MD_APPLY_SYM_VALUE(FIX) 0
 237
 238 #define TC_PARSE_CONS_EXPRESSION(EXP, NBYTES) \
 239   ppc_elf_parse_cons (EXP, NBYTES)
 240 extern bfd_reloc_code_real_type ppc_elf_parse_cons (expressionS *,
 241                                                     unsigned int);
 242 #define TC_CONS_FIX_CHECK(EXP, NBYTES, FIX) \
 243   ppc_elf_cons_fix_check (EXP, NBYTES, FIX)
 244 extern void ppc_elf_cons_fix_check (expressionS *, unsigned int, struct fix *);
 245
 246 #define tc_frob_file_before_adjust ppc_frob_file_before_adjust
 247 extern void ppc_frob_file_before_adjust (void);
 248
 249 #define tc_adjust_symtab() ppc_elf_adjust_symtab ()
 250 extern void ppc_elf_adjust_symtab (void);
 251
 252 extern void ppc_elf_end (void);
 253 #define md_end ppc_elf_end
 254
 255 #endif /* OBJ_ELF */
 256
 257 #if defined (OBJ_ELF) || defined (OBJ_XCOFF)
 258 #define TC_FORCE_RELOCATION(FIX) ppc_force_relocation (FIX)
 259 extern int ppc_force_relocation (struct fix *);
 260 #endif
 261
 262 #ifdef OBJ_ELF
 263 /* Don't allow the generic code to convert fixups involving the
 264    subtraction of a label in the current section to pc-relative if we
 265    don't have the necessary pc-relative relocation.  */
 266 #define TC_FORCE_RELOCATION_SUB_LOCAL(FIX, SEG) \
 267   (!((FIX)->fx_r_type == BFD_RELOC_64                           \
 268      || (FIX)->fx_r_type == BFD_RELOC_32                        \
 269      || (FIX)->fx_r_type == BFD_RELOC_16                        \
 270      || (FIX)->fx_r_type == BFD_RELOC_LO16                      \
 271      || (FIX)->fx_r_type == BFD_RELOC_HI16                      \
 272      || (FIX)->fx_r_type == BFD_RELOC_HI16_S                    \
 273      || (FIX)->fx_r_type == BFD_RELOC_PPC64_ADDR16_HIGH         \
 274      || (FIX)->fx_r_type == BFD_RELOC_PPC64_ADDR16_HIGHA        \
 275      || (FIX)->fx_r_type == BFD_RELOC_PPC64_HIGHER              \
 276      || (FIX)->fx_r_type == BFD_RELOC_PPC64_HIGHER_S            \
 277      || (FIX)->fx_r_type == BFD_RELOC_PPC64_HIGHEST             \
 278      || (FIX)->fx_r_type == BFD_RELOC_PPC64_HIGHEST_S           \
 279      || (FIX)->fx_r_type == BFD_RELOC_PPC64_ADDR16_HIGHER34     \
 280      || (FIX)->fx_r_type == BFD_RELOC_PPC64_ADDR16_HIGHERA34    \
 281      || (FIX)->fx_r_type == BFD_RELOC_PPC64_ADDR16_HIGHEST34    \
 282      || (FIX)->fx_r_type == BFD_RELOC_PPC64_ADDR16_HIGHESTA34   \
 283      || (FIX)->fx_r_type == BFD_RELOC_PPC_16DX_HA               \
 284      || (FIX)->fx_r_type == BFD_RELOC_PPC64_D34                 \
 285      || (FIX)->fx_r_type == BFD_RELOC_PPC64_D28))
 286 #endif
 287
 288 #define TC_VALIDATE_FIX_SUB(FIX, SEG) 0
 289
 290 /* Various frobbings of labels and their addresses.  */
 291 #define md_start_line_hook() ppc_start_line_hook ()
 292 extern void ppc_start_line_hook (void);
 293
 294 /* Set the symbol class of a label based on the csect.  */
 295 #define tc_frob_label(sym) ppc_frob_label (sym)
 296 extern void ppc_frob_label (symbolS *);
 297
 298 /* call md_pcrel_from_section, not md_pcrel_from */
 299 #define MD_PCREL_FROM_SECTION(FIX, SEC) md_pcrel_from_section(FIX, SEC)
 300 extern long md_pcrel_from_section (struct fix *, segT);
 301
 302 #define md_parse_name(name, exp, mode, c) ppc_parse_name (name, exp)
 303 extern int ppc_parse_name (const char *, struct expressionS *);
 304
 305 #define md_optimize_expr(left, op, right) ppc_optimize_expr (left, op, right)
 306 extern int ppc_optimize_expr (expressionS *, operatorT, expressionS *);
 307
 308 #define md_operand(x)
 309
 310 #define md_cleanup() ppc_cleanup ()
 311 extern void ppc_cleanup (void);
 312
 313 #if (defined TE_AIX5 || defined TE_AIX                                  \
 314      || defined TE_FreeBSD || defined TE_NetBSD || defined TE_LYNX)
 315 /* ppc uses different register numbers between .eh_frame and .debug_frame.
 316    This macro translates the .eh_frame register numbers to .debug_frame
 317    register numbers.  */
 318 #define md_reg_eh_frame_to_debug_frame(regno)                           \
 319   ((regno) == 70 ? 64   /* cr2 */                                       \
 320    : (regno) == 65 ? 108 /* lr */                                       \
 321    : (regno) == 66 ? 109 /* ctr */                                      \
 322    : (regno) >= 68 && (regno) <= 75 ? (regno) + 86 - 68 /* crN */       \
 323    : (regno) == 76 ? 101 /* xer */                                      \
 324    : (regno) >= 77 && (regno) <= 108 ? (regno) + 1124 - 77 /* vrN */    \
 325    : (regno) == 109 ? 356 /* vrsave */                                  \
 326    : (regno) == 110 ? 67 /* vscr */                                     \
 327    : (regno) == 111 ? 99 /* spe_acc */                                  \
 328    : (regno) == 112 ? 612 /* spefscr */                                 \
 329    : (regno))
 330 #endif
 331
 332 #define TARGET_USE_CFIPOP 1
 333
 334 #define tc_cfi_frame_initial_instructions ppc_cfi_frame_initial_instructions
 335 extern void ppc_cfi_frame_initial_instructions (void);
 336
 337 #define tc_regname_to_dw2regnum tc_ppc_regname_to_dw2regnum
 338 extern int tc_ppc_regname_to_dw2regnum (char *);
 339
 340 extern int ppc_cie_data_alignment;
 341
 342 extern int ppc_dwarf2_line_min_insn_length;
 343
 344 #define DWARF2_LINE_MIN_INSN_LENGTH     ppc_dwarf2_line_min_insn_length
 345 #define DWARF2_DEFAULT_RETURN_COLUMN    0x41
 346 #define DWARF2_CIE_DATA_ALIGNMENT       ppc_cie_data_alignment
 347 #define EH_FRAME_ALIGNMENT              2