gas/config/tc-ppc.h

   1 /* tc-ppc.h -- Header file for tc-ppc.c.
   2    Copyright 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001
   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 #define TARGET_MACH (ppc_mach ())
  51 extern enum bfd_architecture ppc_arch PARAMS ((void));
  52 extern unsigned long ppc_mach PARAMS ((void));
  53
  54 /* Whether or not the target is big endian */
  55 extern int target_big_endian;
  56
  57 /* The target BFD format.  */
  58 #define TARGET_FORMAT (ppc_target_format ())
  59 extern char *ppc_target_format PARAMS ((void));
  60
  61 /* Permit temporary numeric labels.  */
  62 #define LOCAL_LABELS_FB 1
  63
  64 /* $ is used to refer to the current location.  */
  65 #define DOLLAR_DOT
  66
  67 /* Strings do not use backslash escapes under COFF.  */
  68 #ifdef OBJ_COFF
  69 #define NO_STRING_ESCAPES
  70 #endif
  71
  72 #ifdef OBJ_ELF
  73 #define DIFF_EXPR_OK            /* foo-. gets turned into PC relative relocs */
  74 #endif
  75
  76 #if TARGET_BYTES_BIG_ENDIAN
  77 #define PPC_BIG_ENDIAN 1
  78 #else
  79 #define PPC_BIG_ENDIAN 0
  80 #endif
  81
  82 /* We don't need to handle .word strangely.  */
  83 #define WORKING_DOT_WORD
  84
  85 /* We set the fx_done field appropriately in md_apply_fix.  */
  86 #define TC_HANDLES_FX_DONE
  87
  88 #define MAX_MEM_FOR_RS_ALIGN_CODE 4
  89 #define HANDLE_ALIGN(FRAGP)                                             \
  90   if ((FRAGP)->fr_type == rs_align_code)                                \
  91     {                                                                   \
  92       valueT count = ((FRAGP)->fr_next->fr_address                      \
  93                       - ((FRAGP)->fr_address + (FRAGP)->fr_fix));       \
  94       if (count != 0 && (count & 3) == 0)                               \
  95         {                                                               \
  96           unsigned char *dest = (FRAGP)->fr_literal + (FRAGP)->fr_fix;  \
  97                                                                         \
  98           (FRAGP)->fr_var = 4;                                          \
  99           if (target_big_endian)                                        \
 100             {                                                           \
 101               *dest++ = 0x60;                                           \
 102               *dest++ = 0;                                              \
 103               *dest++ = 0;                                              \
 104               *dest++ = 0;                                              \
 105             }                                                           \
 106           else                                                          \
 107             {                                                           \
 108               *dest++ = 0;                                              \
 109               *dest++ = 0;                                              \
 110               *dest++ = 0;                                              \
 111               *dest++ = 0x60;                                           \
 112             }                                                           \
 113         }                                                               \
 114     }
 115
 116 \f
 117 #ifdef TE_PE
 118
 119 /* Question marks are permitted in symbol names.  */
 120 #define LEX_QM 1
 121
 122 /* Don't adjust TOC relocs.  */
 123 #define tc_fix_adjustable(fixp) ppc_pe_fix_adjustable (fixp)
 124 extern int ppc_pe_fix_adjustable PARAMS ((struct fix *));
 125
 126 #endif
 127
 128 #ifdef OBJ_XCOFF
 129
 130 /* Declarations needed when generating XCOFF code.  XCOFF is an
 131    extension of COFF, used only on the RS/6000.  Rather than create an
 132    obj-xcoff, we just use obj-coff, and handle the extensions here in
 133    tc-ppc.  */
 134
 135 /* We need to keep some information for symbols.  */
 136 struct ppc_tc_sy
 137 {
 138   /* We keep a few linked lists of symbols.  */
 139   symbolS *next;
 140   /* Non-zero if the symbol should be output.  The RS/6000 assembler
 141      only outputs symbols that are external or are mentioned in a
 142      .globl or .lglobl statement.  */
 143   int output;
 144   /* The symbol class.  */
 145   int class;
 146   /* The real name, if the symbol was renamed.  */
 147   char *real_name;
 148   /* For a csect symbol, the subsegment we are using.  This is zero
 149      for symbols that are not csects.  */
 150   subsegT subseg;
 151   /* For a csect or common symbol, the alignment to use.  */
 152   int align;
 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 csect symbol, the last symbol which has been defined in
 157      this csect, or NULL if none have been defined so far.  For a .bs
 158      symbol, the referenced csect symbol.  */
 159   symbolS *within;
 160 };
 161
 162 #define TC_SYMFIELD_TYPE struct ppc_tc_sy
 163
 164 /* We need an additional auxent for function symbols.  */
 165 #define OBJ_COFF_MAX_AUXENTRIES 2
 166
 167 /* Square and curly brackets are permitted in symbol names.  */
 168 #define LEX_BR 3
 169
 170 /* Canonicalize the symbol name.  */
 171 #define tc_canonicalize_symbol_name(name) ppc_canonicalize_symbol_name (name)
 172 extern char *ppc_canonicalize_symbol_name PARAMS ((char *));
 173
 174 /* Get the symbol class from the name.  */
 175 #define tc_symbol_new_hook(sym) ppc_symbol_new_hook (sym)
 176 extern void ppc_symbol_new_hook PARAMS ((symbolS *));
 177
 178 /* Set the symbol class of a label based on the csect.  */
 179 #define tc_frob_label(sym) ppc_frob_label (sym)
 180 extern void ppc_frob_label PARAMS ((symbolS *));
 181
 182 /* TOC relocs requires special handling.  */
 183 #define tc_fix_adjustable(fixp) ppc_fix_adjustable (fixp)
 184 extern int ppc_fix_adjustable PARAMS ((struct fix *));
 185
 186 /* A relocation from one csect to another must be kept.  */
 187 #define TC_FORCE_RELOCATION(FIXP) ppc_force_relocation (FIXP)
 188 extern int ppc_force_relocation PARAMS ((struct fix *));
 189
 190 /* We need to set the section VMA.  */
 191 #define tc_frob_section(sec) ppc_frob_section (sec)
 192 extern void ppc_frob_section PARAMS ((asection *));
 193
 194 /* Finish up the symbol.  */
 195 #define tc_frob_symbol(sym, punt) punt = ppc_frob_symbol (sym)
 196 extern int ppc_frob_symbol PARAMS ((symbolS *));
 197
 198 /* Finish up the entire symtab.  */
 199 #define tc_adjust_symtab() ppc_adjust_symtab ()
 200 extern void ppc_adjust_symtab PARAMS ((void));
 201
 202 /* Niclas Andersson <nican@ida.liu.se> says this is needed.  */
 203 extern int ppc_subseg_align PARAMS ((void));
 204 #define SUB_SEGMENT_ALIGN(SEG) ppc_subseg_align()
 205
 206 /* We also need to copy, in particular, the class of the symbol,
 207    over what obj-coff would otherwise have copied.  */
 208 #define OBJ_COPY_SYMBOL_ATTRIBUTES(dest,src)                    \
 209 do {                                                            \
 210   if (SF_GET_GET_SEGMENT (dest))                                \
 211     S_SET_SEGMENT (dest, S_GET_SEGMENT (src));                  \
 212   symbol_get_tc (dest)->size = symbol_get_tc (src)->size;       \
 213   symbol_get_tc (dest)->align = symbol_get_tc (src)->align;     \
 214   symbol_get_tc (dest)->class = symbol_get_tc (src)->class;     \
 215   symbol_get_tc (dest)->within = symbol_get_tc (src)->within;   \
 216 } while (0)
 217
 218 #endif /* OBJ_XCOFF */
 219
 220 #ifdef OBJ_ELF
 221
 222 /* Branch prediction relocations must force relocation, as must
 223    the vtable description relocs.  */
 224 #define TC_FORCE_RELOCATION(FIXP)                                       \
 225 ((FIXP)->fx_r_type == BFD_RELOC_PPC_B16_BRTAKEN                         \
 226  || (FIXP)->fx_r_type == BFD_RELOC_PPC_B16_BRNTAKEN                     \
 227  || (FIXP)->fx_r_type == BFD_RELOC_PPC_BA16_BRTAKEN                     \
 228  || (FIXP)->fx_r_type == BFD_RELOC_PPC_BA16_BRNTAKEN                    \
 229  || (BFD_DEFAULT_TARGET_SIZE == 64                                      \
 230      && (FIXP)->fx_r_type == BFD_RELOC_PPC64_TOC)                       \
 231  || (FIXP)->fx_r_type == BFD_RELOC_VTABLE_INHERIT                       \
 232  || (FIXP)->fx_r_type == BFD_RELOC_VTABLE_ENTRY)
 233
 234 #define TC_FORCE_RELOCATION_SECTION(FIXP,SEC)                           \
 235 (TC_FORCE_RELOCATION (FIXP)                                             \
 236  || ((FIXP)->fx_addsy && !(FIXP)->fx_subsy                              \
 237      && S_GET_SEGMENT ((FIXP)->fx_addsy) != SEC))
 238
 239 /* Support for SHF_EXCLUDE and SHT_ORDERED */
 240 extern int ppc_section_letter PARAMS ((int, char **));
 241 extern int ppc_section_type PARAMS ((char *, size_t));
 242 extern int ppc_section_word PARAMS ((char *, size_t));
 243 extern int ppc_section_flags PARAMS ((int, int, int));
 244
 245 #define md_elf_section_letter(LETTER, PTR_MSG)  ppc_section_letter (LETTER, PTR_MSG)
 246 #define md_elf_section_type(STR, LEN)           ppc_section_type (STR, LEN)
 247 #define md_elf_section_word(STR, LEN)           ppc_section_word (STR, LEN)
 248 #define md_elf_section_flags(FLAGS, ATTR, TYPE) ppc_section_flags (FLAGS, ATTR, TYPE)
 249
 250 #if BFD_DEFAULT_TARGET_SIZE == 64
 251 /* Extra sections for 64-bit ELF PPC. */
 252 #define ELF_TC_SPECIAL_SECTIONS \
 253   { ".toc",             SHT_PROGBITS,   SHF_ALLOC + SHF_WRITE}, \
 254   { ".tocbss",          SHT_NOBITS,     SHF_ALLOC + SHF_WRITE},
 255 #else
 256 /* Add extra PPC sections -- Note, for now, make .sbss2 and .PPC.EMB.sbss0 a
 257    normal section, and not a bss section so that the linker doesn't crater
 258    when trying to make more than 2 sections.  */
 259 #define ELF_TC_SPECIAL_SECTIONS \
 260   { ".tags",            SHT_ORDERED,    SHF_ALLOC }, \
 261   { ".sdata",           SHT_PROGBITS,   SHF_ALLOC + SHF_WRITE }, \
 262   { ".sbss",            SHT_NOBITS,     SHF_ALLOC + SHF_WRITE }, \
 263   { ".sdata2",          SHT_PROGBITS,   SHF_ALLOC }, \
 264   { ".sbss2",           SHT_PROGBITS,   SHF_ALLOC }, \
 265   { ".PPC.EMB.sdata0",  SHT_PROGBITS,   SHF_ALLOC }, \
 266   { ".PPC.EMB.sbss0",   SHT_PROGBITS,   SHF_ALLOC },
 267 #endif
 268
 269 #define tc_comment_chars ppc_comment_chars
 270 extern const char *ppc_comment_chars;
 271
 272 /* Keep relocations relative to the GOT, or non-PC relative.  */
 273 #define tc_fix_adjustable(fixp) ppc_fix_adjustable (fixp)
 274 extern int ppc_fix_adjustable PARAMS ((struct fix *));
 275
 276 /* We must never ever try to resolve references to externally visible
 277    symbols in the assembler, because the .o file might go into a shared
 278    library, and some other shared library might override that symbol.  */
 279 #define TC_RELOC_RTSYM_LOC_FIXUP(FIX)  \
 280   ((FIX)->fx_addsy == NULL \
 281    || (! S_IS_EXTERNAL ((FIX)->fx_addsy) \
 282        && ! S_IS_WEAK ((FIX)->fx_addsy) \
 283        && S_IS_DEFINED ((FIX)->fx_addsy) \
 284        && ! S_IS_COMMON ((FIX)->fx_addsy)))
 285
 286 #if BFD_DEFAULT_TARGET_SIZE == 64
 287 /* Finish up the symbol.  */
 288 #define tc_frob_symbol(sym, punt) punt = ppc_elf_frob_symbol (sym)
 289 extern int ppc_elf_frob_symbol PARAMS ((symbolS *));
 290 #endif
 291
 292 #define DWARF2_LINE_MIN_INSN_LENGTH 4
 293 #endif /* OBJ_ELF */
 294
 295 /* call md_apply_fix3 with segment instead of md_apply_fix */
 296 #define MD_APPLY_FIX3
 297
 298 /* call md_pcrel_from_section, not md_pcrel_from */
 299 #define MD_PCREL_FROM_SECTION(FIXP, SEC) md_pcrel_from_section(FIXP, SEC)
 300 extern long md_pcrel_from_section PARAMS ((struct fix *, segT));
 301
 302 #define md_parse_name(name, exp, c) ppc_parse_name (name, exp)
 303 extern int ppc_parse_name PARAMS ((const char *, struct expressionS *));
 304
 305 #define md_operand(x)