gas/config/tc-ppc.h

   1 /* tc-ppc.h -- Header file for tc-ppc.c.
   2    Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000
   3    Free Software Foundation, Inc.
   4    Written by Ian Lance Taylor, Cygnus Support.
   5
   6    This file is part of GAS, the GNU Assembler.
   7
   8    GAS is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 2, or (at your option)
  11    any later version.
  12
  13    GAS is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with GAS; see the file COPYING.  If not, write to the Free
  20    Software Foundation, 59 Temple Place - Suite 330, Boston, MA
  21    02111-1307, USA. */
  22
  23 #define TC_PPC
  24
  25 #ifdef ANSI_PROTOTYPES
  26 struct fix;
  27 #endif
  28
  29 /* Set the endianness we are using.  Default to big endian.  */
  30 #ifndef TARGET_BYTES_BIG_ENDIAN
  31 #define TARGET_BYTES_BIG_ENDIAN 1
  32 #endif
  33
  34 #ifndef BFD_ASSEMBLER
  35  #error PowerPC support requires BFD_ASSEMBLER
  36 #endif
  37
  38 /* If OBJ_COFF is defined, and TE_PE is not defined, we are assembling
  39    XCOFF for AIX or PowerMac.  If TE_PE is defined, we are assembling
  40    COFF for Windows NT.  */
  41
  42 #ifdef OBJ_COFF
  43 #ifndef TE_PE
  44 #define OBJ_XCOFF
  45 #endif
  46 #endif
  47
  48 /* The target BFD architecture.  */
  49 #define TARGET_ARCH (ppc_arch ())
  50 extern enum bfd_architecture ppc_arch PARAMS ((void));
  51
  52 /* Whether or not the target is big endian */
  53 extern int target_big_endian;
  54
  55 /* The target BFD format.  */
  56 #ifdef OBJ_COFF
  57 #ifdef TE_PE
  58 #define TARGET_FORMAT (target_big_endian ? "pe-powerpc" : "pe-powerpcle")
  59 #else
  60 #define TARGET_FORMAT "aixcoff-rs6000"
  61 #endif
  62 #endif
  63
  64 /* PowerMac has a BFD slightly different from AIX's.  */
  65 #ifdef TE_POWERMAC
  66 #ifdef TARGET_FORMAT
  67 #undef TARGET_FORMAT
  68 #endif
  69 #define TARGET_FORMAT "xcoff-powermac"
  70 #endif
  71
  72 #ifdef OBJ_ELF
  73 #define TARGET_FORMAT (target_big_endian ? "elf32-powerpc" : "elf32-powerpcle")
  74 #endif
  75
  76 /* Permit temporary numeric labels.  */
  77 #define LOCAL_LABELS_FB 1
  78
  79 /* $ is used to refer to the current location.  */
  80 #define DOLLAR_DOT
  81
  82 /* Strings do not use backslash escapes under COFF.  */
  83 #ifdef OBJ_COFF
  84 #define NO_STRING_ESCAPES
  85 #endif
  86
  87 #ifdef OBJ_ELF
  88 #define DIFF_EXPR_OK            /* foo-. gets turned into PC relative relocs */
  89 #endif
  90
  91 #if TARGET_BYTES_BIG_ENDIAN
  92 #define PPC_BIG_ENDIAN 1
  93 #else
  94 #define PPC_BIG_ENDIAN 0
  95 #endif
  96
  97 /* We don't need to handle .word strangely.  */
  98 #define WORKING_DOT_WORD
  99
 100 /* We set the fx_done field appropriately in md_apply_fix.  */
 101 #define TC_HANDLES_FX_DONE
 102 \f
 103 #ifdef TE_PE
 104
 105 /* Question marks are permitted in symbol names.  */
 106 #define LEX_QM 1
 107
 108 /* Don't adjust TOC relocs.  */
 109 #define tc_fix_adjustable(fixp) ppc_pe_fix_adjustable (fixp)
 110 extern int ppc_pe_fix_adjustable PARAMS ((struct fix *));
 111
 112 #endif
 113
 114 #ifdef OBJ_XCOFF
 115
 116 /* Declarations needed when generating XCOFF code.  XCOFF is an
 117    extension of COFF, used only on the RS/6000.  Rather than create an
 118    obj-xcoff, we just use obj-coff, and handle the extensions here in
 119    tc-ppc.  */
 120
 121 /* We need to keep some information for symbols.  */
 122 struct ppc_tc_sy
 123 {
 124   /* We keep a few linked lists of symbols.  */
 125   symbolS *next;
 126   /* Non-zero if the symbol should be output.  The RS/6000 assembler
 127      only outputs symbols that are external or are mentioned in a
 128      .globl or .lglobl statement.  */
 129   int output;
 130   /* The symbol class.  */
 131   int class;
 132   /* The real name, if the symbol was renamed.  */
 133   char *real_name;
 134   /* For a csect symbol, the subsegment we are using.  This is zero
 135      for symbols that are not csects.  */
 136   subsegT subseg;
 137   /* For a csect or common symbol, the alignment to use.  */
 138   int align;
 139   /* For a function symbol, a symbol whose value is the size.  The
 140      field is NULL if there is no size.  */
 141   symbolS *size;
 142   /* For a csect symbol, the last symbol which has been defined in
 143      this csect, or NULL if none have been defined so far.  For a .bs
 144      symbol, the referenced csect symbol.  */
 145   symbolS *within;
 146 };
 147
 148 #define TC_SYMFIELD_TYPE struct ppc_tc_sy
 149
 150 /* We need an additional auxent for function symbols.  */
 151 #define OBJ_COFF_MAX_AUXENTRIES 2
 152
 153 /* Square and curly brackets are permitted in symbol names.  */
 154 #define LEX_BR 3
 155
 156 /* Canonicalize the symbol name.  */
 157 #define tc_canonicalize_symbol_name(name) ppc_canonicalize_symbol_name (name)
 158 extern char *ppc_canonicalize_symbol_name PARAMS ((char *));
 159
 160 /* Get the symbol class from the name.  */
 161 #define tc_symbol_new_hook(sym) ppc_symbol_new_hook (sym)
 162 extern void ppc_symbol_new_hook PARAMS ((symbolS *));
 163
 164 /* Set the symbol class of a label based on the csect.  */
 165 #define tc_frob_label(sym) ppc_frob_label (sym)
 166 extern void ppc_frob_label PARAMS ((symbolS *));
 167
 168 /* TOC relocs requires special handling.  */
 169 #define tc_fix_adjustable(fixp) ppc_fix_adjustable (fixp)
 170 extern int ppc_fix_adjustable PARAMS ((struct fix *));
 171
 172 /* A relocation from one csect to another must be kept.  */
 173 #define TC_FORCE_RELOCATION(FIXP) ppc_force_relocation (FIXP)
 174 extern int ppc_force_relocation PARAMS ((struct fix *));
 175
 176 /* We need to set the section VMA.  */
 177 #define tc_frob_section(sec) ppc_frob_section (sec)
 178 extern void ppc_frob_section PARAMS ((asection *));
 179
 180 /* Finish up the symbol.  */
 181 #define tc_frob_symbol(sym, punt) punt = ppc_frob_symbol (sym)
 182 extern int ppc_frob_symbol PARAMS ((symbolS *));
 183
 184 /* Finish up the entire symtab.  */
 185 #define tc_adjust_symtab() ppc_adjust_symtab ()
 186 extern void ppc_adjust_symtab PARAMS ((void));
 187
 188 /* Niclas Andersson <nican@ida.liu.se> says this is needed.  */
 189 #define SUB_SEGMENT_ALIGN(SEG) 2
 190
 191 /* We also need to copy, in particular, the class of the symbol,
 192    over what obj-coff would otherwise have copied.  */
 193 #define OBJ_COPY_SYMBOL_ATTRIBUTES(dest,src)                    \
 194 do {                                                            \
 195   if (SF_GET_GET_SEGMENT (dest))                                \
 196     S_SET_SEGMENT (dest, S_GET_SEGMENT (src));                  \
 197   symbol_get_tc (dest)->size = symbol_get_tc (src)->size;       \
 198   symbol_get_tc (dest)->align = symbol_get_tc (src)->align;     \
 199   symbol_get_tc (dest)->class = symbol_get_tc (src)->class;     \
 200   symbol_get_tc (dest)->within = symbol_get_tc (src)->within;   \
 201 } while (0)
 202
 203
 204 #endif /* OBJ_XCOFF */
 205
 206 #ifdef OBJ_ELF
 207
 208 /* Branch prediction relocations must force relocation, as must
 209    the vtable description relocs.  */
 210 #define TC_FORCE_RELOCATION(FIXP)                                       \
 211 ((FIXP)->fx_r_type == BFD_RELOC_PPC_B16_BRTAKEN                         \
 212  || (FIXP)->fx_r_type == BFD_RELOC_PPC_B16_BRNTAKEN                     \
 213  || (FIXP)->fx_r_type == BFD_RELOC_PPC_BA16_BRTAKEN                     \
 214  || (FIXP)->fx_r_type == BFD_RELOC_PPC_BA16_BRNTAKEN                    \
 215  || (FIXP)->fx_r_type == BFD_RELOC_VTABLE_INHERIT                       \
 216  || (FIXP)->fx_r_type == BFD_RELOC_VTABLE_ENTRY)
 217
 218 #define TC_FORCE_RELOCATION_SECTION(FIXP,SEC)                           \
 219 (TC_FORCE_RELOCATION (FIXP)                                             \
 220  || ((FIXP)->fx_addsy && !(FIXP)->fx_subsy                              \
 221      && S_GET_SEGMENT ((FIXP)->fx_addsy) != SEC))
 222
 223 /* Support for SHF_EXCLUDE and SHT_ORDERED */
 224 extern int ppc_section_letter PARAMS ((int, char **));
 225 extern int ppc_section_type PARAMS ((char *, size_t));
 226 extern int ppc_section_word PARAMS ((char *, size_t));
 227 extern int ppc_section_flags PARAMS ((int, int, int));
 228
 229 #define md_elf_section_letter(LETTER, PTR_MSG)  ppc_section_letter (LETTER, PTR_MSG)
 230 #define md_elf_section_type(STR, LEN)           ppc_section_type (STR, LEN)
 231 #define md_elf_section_word(STR, LEN)           ppc_section_word (STR, LEN)
 232 #define md_elf_section_flags(FLAGS, ATTR, TYPE) ppc_section_flags (FLAGS, ATTR, TYPE)
 233
 234 /* Add extra PPC sections -- Note, for now, make .sbss2 and .PPC.EMB.sbss0 a
 235    normal section, and not a bss section so that the linker doesn't crater
 236    when trying to make more than 2 sections.  */
 237 #define ELF_TC_SPECIAL_SECTIONS \
 238   { ".tags",            SHT_ORDERED,    SHF_ALLOC }, \
 239   { ".sdata",           SHT_PROGBITS,   SHF_ALLOC + SHF_WRITE }, \
 240   { ".sbss",            SHT_NOBITS,     SHF_ALLOC + SHF_WRITE }, \
 241   { ".sdata2",          SHT_PROGBITS,   SHF_ALLOC }, \
 242   { ".sbss2",           SHT_PROGBITS,   SHF_ALLOC }, \
 243   { ".PPC.EMB.sdata0",  SHT_PROGBITS,   SHF_ALLOC }, \
 244   { ".PPC.EMB.sbss0",   SHT_PROGBITS,   SHF_ALLOC },
 245
 246 #define tc_comment_chars ppc_comment_chars
 247 extern const char *ppc_comment_chars;
 248
 249 /* Keep relocations relative to the GOT, or non-PC relative. */
 250 #define tc_fix_adjustable(FIX)                                          \
 251   ((FIX)->fx_r_type != BFD_RELOC_16_GOTOFF                              \
 252    && (FIX)->fx_r_type != BFD_RELOC_LO16_GOTOFF                         \
 253    && (FIX)->fx_r_type != BFD_RELOC_HI16_GOTOFF                         \
 254    && (FIX)->fx_r_type != BFD_RELOC_HI16_S_GOTOFF                       \
 255    && (FIX)->fx_r_type != BFD_RELOC_GPREL16                             \
 256    && (FIX)->fx_r_type != BFD_RELOC_VTABLE_INHERIT                      \
 257    && (FIX)->fx_r_type != BFD_RELOC_VTABLE_ENTRY                        \
 258    && ! S_IS_EXTERNAL ((FIX)->fx_addsy)                                 \
 259    && ! S_IS_WEAK ((FIX)->fx_addsy)                                     \
 260    && ((FIX)->fx_pcrel                                                  \
 261        || ((FIX)->fx_subsy != NULL                                      \
 262            && (S_GET_SEGMENT ((FIX)->fx_subsy)                          \
 263                == S_GET_SEGMENT ((FIX)->fx_addsy)))                     \
 264        || S_IS_LOCAL ((FIX)->fx_addsy)))
 265
 266 /* We must never ever try to resolve references to externally visible
 267    symbols in the assembler, because the .o file might go into a shared
 268    library, and some other shared library might override that symbol.  */
 269 #define TC_RELOC_RTSYM_LOC_FIXUP(FIX)  \
 270   ((FIX)->fx_addsy == NULL \
 271    || (! S_IS_EXTERNAL ((FIX)->fx_addsy) \
 272        && ! S_IS_WEAK ((FIX)->fx_addsy) \
 273        && S_IS_DEFINED ((FIX)->fx_addsy) \
 274        && ! S_IS_COMMON ((FIX)->fx_addsy)))
 275
 276 #endif /* OBJ_ELF */
 277
 278 /* call md_apply_fix3 with segment instead of md_apply_fix */
 279 #define MD_APPLY_FIX3
 280
 281 /* call md_pcrel_from_section, not md_pcrel_from */
 282 #define MD_PCREL_FROM_SECTION(FIXP, SEC) md_pcrel_from_section(FIXP, SEC)
 283 extern long md_pcrel_from_section PARAMS ((struct fix *, segT));
 284
 285 #define md_parse_name(name, exp) ppc_parse_name (name, exp)
 286 extern int ppc_parse_name PARAMS ((const char *, struct expressionS *));
 287
 288 #define md_operand(x)
 289