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, 2002
   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 #define MAX_MEM_FOR_RS_ALIGN_CODE 4
  86 #define HANDLE_ALIGN(FRAGP)                                             \
  87   if ((FRAGP)->fr_type == rs_align_code)                                \
  88     {                                                                   \
  89       valueT count = ((FRAGP)->fr_next->fr_address                      \
  90                       - ((FRAGP)->fr_address + (FRAGP)->fr_fix));       \
  91       if (count != 0 && (count & 3) == 0)                               \
  92         {                                                               \
  93           unsigned char *dest = (FRAGP)->fr_literal + (FRAGP)->fr_fix;  \
  94                                                                         \
  95           (FRAGP)->fr_var = 4;                                          \
  96           if (target_big_endian)                                        \
  97             {                                                           \
  98               *dest++ = 0x60;                                           \
  99               *dest++ = 0;                                              \
 100               *dest++ = 0;                                              \
 101               *dest++ = 0;                                              \
 102             }                                                           \
 103           else                                                          \
 104             {                                                           \
 105               *dest++ = 0;                                              \
 106               *dest++ = 0;                                              \
 107               *dest++ = 0;                                              \
 108               *dest++ = 0x60;                                           \
 109             }                                                           \
 110         }                                                               \
 111     }
 112
 113 \f
 114 #ifdef TE_PE
 115
 116 /* Question marks are permitted in symbol names.  */
 117 #define LEX_QM 1
 118
 119 /* Don't adjust TOC relocs.  */
 120 #define tc_fix_adjustable(fixp) ppc_pe_fix_adjustable (fixp)
 121 extern int ppc_pe_fix_adjustable PARAMS ((struct fix *));
 122
 123 #endif
 124
 125 #ifdef OBJ_XCOFF
 126
 127 /* Declarations needed when generating XCOFF code.  XCOFF is an
 128    extension of COFF, used only on the RS/6000.  Rather than create an
 129    obj-xcoff, we just use obj-coff, and handle the extensions here in
 130    tc-ppc.  */
 131
 132 /* We need to keep some information for symbols.  */
 133 struct ppc_tc_sy
 134 {
 135   /* We keep a few linked lists of symbols.  */
 136   symbolS *next;
 137   /* Non-zero if the symbol should be output.  The RS/6000 assembler
 138      only outputs symbols that are external or are mentioned in a
 139      .globl or .lglobl statement.  */
 140   int output;
 141   /* The symbol class.  */
 142   int class;
 143   /* The real name, if the symbol was renamed.  */
 144   char *real_name;
 145   /* For a csect symbol, the subsegment we are using.  This is zero
 146      for symbols that are not csects.  */
 147   subsegT subseg;
 148   /* For a csect or common symbol, the alignment to use.  */
 149   int align;
 150   /* For a function symbol, a symbol whose value is the size.  The
 151      field is NULL if there is no size.  */
 152   symbolS *size;
 153   /* For a csect symbol, the last symbol which has been defined in
 154      this csect, or NULL if none have been defined so far.  For a .bs
 155      symbol, the referenced csect symbol.  */
 156   symbolS *within;
 157 };
 158
 159 #define TC_SYMFIELD_TYPE struct ppc_tc_sy
 160
 161 /* We need an additional auxent for function symbols.  */
 162 #define OBJ_COFF_MAX_AUXENTRIES 2
 163
 164 /* Square and curly brackets are permitted in symbol names.  */
 165 #define LEX_BR 3
 166
 167 /* Canonicalize the symbol name.  */
 168 #define tc_canonicalize_symbol_name(name) ppc_canonicalize_symbol_name (name)
 169 extern char *ppc_canonicalize_symbol_name PARAMS ((char *));
 170
 171 /* Get the symbol class from the name.  */
 172 #define tc_symbol_new_hook(sym) ppc_symbol_new_hook (sym)
 173 extern void ppc_symbol_new_hook PARAMS ((symbolS *));
 174
 175 /* Set the symbol class of a label based on the csect.  */
 176 #define tc_frob_label(sym) ppc_frob_label (sym)
 177 extern void ppc_frob_label PARAMS ((symbolS *));
 178
 179 /* TOC relocs requires special handling.  */
 180 #define tc_fix_adjustable(fixp) ppc_fix_adjustable (fixp)
 181 extern int ppc_fix_adjustable PARAMS ((struct fix *));
 182
 183 /* A relocation from one csect to another must be kept.  */
 184 #define TC_FORCE_RELOCATION(FIXP) ppc_force_relocation (FIXP)
 185 extern int ppc_force_relocation PARAMS ((struct fix *));
 186
 187 /* We need to set the section VMA.  */
 188 #define tc_frob_section(sec) ppc_frob_section (sec)
 189 extern void ppc_frob_section PARAMS ((asection *));
 190
 191 /* Finish up the symbol.  */
 192 #define tc_frob_symbol(sym, punt) punt = ppc_frob_symbol (sym)
 193 extern int ppc_frob_symbol PARAMS ((symbolS *));
 194
 195 /* Finish up the entire symtab.  */
 196 #define tc_adjust_symtab() ppc_adjust_symtab ()
 197 extern void ppc_adjust_symtab PARAMS ((void));
 198
 199 /* We also need to copy, in particular, the class of the symbol,
 200    over what obj-coff would otherwise have copied.  */
 201 #define OBJ_COPY_SYMBOL_ATTRIBUTES(dest,src)                    \
 202 do {                                                            \
 203   if (SF_GET_GET_SEGMENT (dest))                                \
 204     S_SET_SEGMENT (dest, S_GET_SEGMENT (src));                  \
 205   symbol_get_tc (dest)->size = symbol_get_tc (src)->size;       \
 206   symbol_get_tc (dest)->align = symbol_get_tc (src)->align;     \
 207   symbol_get_tc (dest)->class = symbol_get_tc (src)->class;     \
 208   symbol_get_tc (dest)->within = symbol_get_tc (src)->within;   \
 209 } while (0)
 210
 211 #endif /* OBJ_XCOFF */
 212
 213 #ifdef OBJ_ELF
 214
 215 /* Branch prediction relocations must force relocation, as must
 216    the vtable description relocs.  */
 217 #define TC_FORCE_RELOCATION(FIXP)                                       \
 218 ((FIXP)->fx_r_type == BFD_RELOC_PPC_B16_BRTAKEN                         \
 219  || (FIXP)->fx_r_type == BFD_RELOC_PPC_B16_BRNTAKEN                     \
 220  || (FIXP)->fx_r_type == BFD_RELOC_PPC_BA16_BRTAKEN                     \
 221  || (FIXP)->fx_r_type == BFD_RELOC_PPC_BA16_BRNTAKEN                    \
 222  || (FIXP)->fx_r_type == BFD_RELOC_PPC64_TOC                            \
 223  || (FIXP)->fx_r_type == BFD_RELOC_VTABLE_INHERIT                       \
 224  || (FIXP)->fx_r_type == BFD_RELOC_VTABLE_ENTRY)
 225
 226 #define TC_FORCE_RELOCATION_SECTION(FIXP,SEC)                           \
 227 (TC_FORCE_RELOCATION (FIXP)                                             \
 228  || ((FIXP)->fx_addsy && !(FIXP)->fx_subsy                              \
 229      && S_GET_SEGMENT ((FIXP)->fx_addsy) != SEC))
 230
 231 /* Support for SHF_EXCLUDE and SHT_ORDERED */
 232 extern int ppc_section_letter PARAMS ((int, char **));
 233 extern int ppc_section_type PARAMS ((char *, size_t));
 234 extern int ppc_section_word PARAMS ((char *, size_t));
 235 extern int ppc_section_flags PARAMS ((int, int, int));
 236
 237 #define md_elf_section_letter(LETTER, PTR_MSG)  ppc_section_letter (LETTER, PTR_MSG)
 238 #define md_elf_section_type(STR, LEN)           ppc_section_type (STR, LEN)
 239 #define md_elf_section_word(STR, LEN)           ppc_section_word (STR, LEN)
 240 #define md_elf_section_flags(FLAGS, ATTR, TYPE) ppc_section_flags (FLAGS, ATTR, TYPE)
 241
 242 /* Add extra PPC sections -- Note, for now, make .sbss2 and .PPC.EMB.sbss0 a
 243    normal section, and not a bss section so that the linker doesn't crater
 244    when trying to make more than 2 sections.  */
 245 #define ELF_TC_SPECIAL_SECTIONS \
 246   { ".tags",            SHT_ORDERED,    SHF_ALLOC },                    \
 247   { ".sdata",           SHT_PROGBITS,   SHF_ALLOC + SHF_WRITE },        \
 248   { ".sbss",            SHT_NOBITS,     SHF_ALLOC + SHF_WRITE },        \
 249   { ".sdata2",          SHT_PROGBITS,   SHF_ALLOC },                    \
 250   { ".sbss2",           SHT_PROGBITS,   SHF_ALLOC },                    \
 251   { ".PPC.EMB.apuinfo",       SHT_NOTE,       0 }, \
 252   { ".PPC.EMB.sdata0",  SHT_PROGBITS,   SHF_ALLOC },                    \
 253   { ".PPC.EMB.sbss0",   SHT_PROGBITS,   SHF_ALLOC },                    \
 254   /* Extra sections for 64-bit ELF PPC.  */                             \
 255   { ".toc",             SHT_PROGBITS,   SHF_ALLOC + SHF_WRITE},         \
 256   { ".tocbss",          SHT_NOBITS,     SHF_ALLOC + SHF_WRITE},
 257
 258 #define tc_comment_chars ppc_comment_chars
 259 extern const char *ppc_comment_chars;
 260
 261 /* Keep relocations relative to the GOT, or non-PC relative.  */
 262 #define tc_fix_adjustable(fixp) ppc_fix_adjustable (fixp)
 263 extern int ppc_fix_adjustable PARAMS ((struct fix *));
 264
 265 /* We must never ever try to resolve references to externally visible
 266    symbols in the assembler, because the .o file might go into a shared
 267    library, and some other shared library might override that symbol.  */
 268 #define TC_RELOC_RTSYM_LOC_FIXUP(FIX)  \
 269   ((FIX)->fx_addsy == NULL \
 270    || (! S_IS_EXTERNAL ((FIX)->fx_addsy) \
 271        && ! S_IS_WEAK ((FIX)->fx_addsy) \
 272        && S_IS_DEFINED ((FIX)->fx_addsy) \
 273        && ! S_IS_COMMON ((FIX)->fx_addsy)))
 274
 275 #define tc_frob_file_before_adjust ppc_frob_file_before_adjust
 276 extern void ppc_frob_file_before_adjust PARAMS ((void));
 277
 278 #define DWARF2_LINE_MIN_INSN_LENGTH 4
 279 #endif /* OBJ_ELF */
 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, c) ppc_parse_name (name, exp)
 286 extern int ppc_parse_name PARAMS ((const char *, struct expressionS *));
 287
 288 #define md_operand(x)
 289
 290 #define md_cleanup() ppc_cleanup ()
 291  extern void ppc_cleanup PARAMS ((void));