gas/config/tc-ppc.h

   1 /* tc-ppc.h -- Header file for tc-ppc.c.
   2    Copyright (C) 1994, 1995, 1996, 1997, 1998 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 2, 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, 59 Temple Place - Suite 330, Boston, MA
  20    02111-1307, USA. */
  21
  22 #define TC_PPC
  23
  24 #ifdef ANSI_PROTOTYPES
  25 struct fix;
  26 #endif
  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 #ifndef BFD_ASSEMBLER
  34  #error PowerPC support requires BFD_ASSEMBLER
  35 #endif
  36
  37 /* If OBJ_COFF is defined, and TE_PE is not defined, we are assembling
  38    XCOFF for AIX or PowerMac.  If TE_PE is defined, we are assembling
  39    COFF for Windows NT.  */
  40
  41 #ifdef OBJ_COFF
  42 #ifndef TE_PE
  43 #define OBJ_XCOFF
  44 #endif
  45 #endif
  46
  47 /* The target BFD architecture.  */
  48 #define TARGET_ARCH (ppc_arch ())
  49 extern enum bfd_architecture ppc_arch PARAMS ((void));
  50
  51 /* Whether or not the target is big endian */
  52 extern int target_big_endian;
  53
  54 /* The target BFD format.  */
  55 #ifdef OBJ_COFF
  56 #ifdef TE_PE
  57 #define TARGET_FORMAT (target_big_endian ? "pe-powerpc" : "pe-powerpcle")
  58 #else
  59 #define TARGET_FORMAT "aixcoff-rs6000"
  60 #endif
  61 #endif
  62
  63 /* PowerMac has a BFD slightly different from AIX's.  */
  64 #ifdef TE_POWERMAC
  65 #ifdef TARGET_FORMAT
  66 #undef TARGET_FORMAT
  67 #endif
  68 #define TARGET_FORMAT "xcoff-powermac"
  69 #endif
  70
  71 #ifdef OBJ_ELF
  72 #define TARGET_FORMAT (target_big_endian ? "elf32-powerpc" : "elf32-powerpcle")
  73 #endif
  74
  75 /* Permit temporary numeric labels.  */
  76 #define LOCAL_LABELS_FB 1
  77
  78 /* $ is used to refer to the current location.  */
  79 #define DOLLAR_DOT
  80
  81 /* Strings do not use backslash escapes under COFF.  */
  82 #ifdef OBJ_COFF
  83 #define NO_STRING_ESCAPES
  84 #endif
  85
  86 #ifdef OBJ_ELF
  87 #define DIFF_EXPR_OK            /* foo-. gets turned into PC relative relocs */
  88 #endif
  89
  90 #if TARGET_BYTES_BIG_ENDIAN
  91 #define PPC_BIG_ENDIAN 1
  92 #else
  93 #define PPC_BIG_ENDIAN 0
  94 #endif
  95
  96 /* We don't need to handle .word strangely.  */
  97 #define WORKING_DOT_WORD
  98
  99 /* We set the fx_done field appropriately in md_apply_fix.  */
 100 #define TC_HANDLES_FX_DONE
 101 \f
 102 #ifdef TE_PE
 103
 104 /* Question marks are permitted in symbol names.  */
 105 #define LEX_QM 1
 106
 107 /* Don't adjust TOC relocs.  */
 108 #define tc_fix_adjustable(fixp) ppc_pe_fix_adjustable (fixp)
 109 extern int ppc_pe_fix_adjustable PARAMS ((struct fix *));
 110
 111 #endif
 112
 113 #ifdef OBJ_XCOFF
 114
 115 /* Declarations needed when generating XCOFF code.  XCOFF is an
 116    extension of COFF, used only on the RS/6000.  Rather than create an
 117    obj-xcoff, we just use obj-coff, and handle the extensions here in
 118    tc-ppc.  */
 119
 120 /* We need to keep some information for symbols.  */
 121 struct ppc_tc_sy
 122 {
 123   /* We keep a few linked lists of symbols.  */
 124   struct symbol *next;
 125   /* Non-zero if the symbol should be output.  The RS/6000 assembler
 126      only outputs symbols that are external or are mentioned in a
 127      .globl or .lglobl statement.  */
 128   int output;
 129   /* The symbol class.  */
 130   int class;
 131   /* The real name, if the symbol was renamed.  */
 132   char *real_name;
 133   /* For a csect symbol, the subsegment we are using.  This is zero
 134      for symbols that are not csects.  */
 135   subsegT subseg;
 136   /* For a csect or common symbol, the alignment to use.  */
 137   int align;
 138   /* For a function symbol, a symbol whose value is the size.  The
 139      field is NULL if there is no size.  */
 140   struct symbol *size;
 141   /* For a csect symbol, the last symbol which has been defined in
 142      this csect, or NULL if none have been defined so far.  For a .bs
 143      symbol, the referenced csect symbol.  */
 144   struct symbol *within;
 145 };
 146
 147 #define TC_SYMFIELD_TYPE struct ppc_tc_sy
 148
 149 /* We need an additional auxent for function symbols.  */
 150 #define OBJ_COFF_MAX_AUXENTRIES 2
 151
 152 /* Square and curly brackets are permitted in symbol names.  */
 153 #define LEX_BR 3
 154
 155 /* Canonicalize the symbol name.  */
 156 #define tc_canonicalize_symbol_name(name) ppc_canonicalize_symbol_name (name)
 157 extern char *ppc_canonicalize_symbol_name PARAMS ((char *));
 158
 159 /* Get the symbol class from the name.  */
 160 #define tc_symbol_new_hook(sym) ppc_symbol_new_hook (sym)
 161 extern void ppc_symbol_new_hook PARAMS ((struct symbol *));
 162
 163 /* Set the symbol class of a label based on the csect.  */
 164 #define tc_frob_label(sym) ppc_frob_label (sym)
 165 extern void ppc_frob_label PARAMS ((struct symbol *));
 166
 167 /* TOC relocs requires special handling.  */
 168 #define tc_fix_adjustable(fixp) ppc_fix_adjustable (fixp)
 169 extern int ppc_fix_adjustable PARAMS ((struct fix *));
 170
 171 /* A relocation from one csect to another must be kept.  */
 172 #define TC_FORCE_RELOCATION(FIXP) ppc_force_relocation (FIXP)
 173 extern int ppc_force_relocation PARAMS ((struct fix *));
 174
 175 /* We need to set the section VMA.  */
 176 #define tc_frob_section(sec) ppc_frob_section (sec)
 177 extern void ppc_frob_section PARAMS ((asection *));
 178
 179 /* Finish up the symbol.  */
 180 #define tc_frob_symbol(sym, punt) punt = ppc_frob_symbol (sym)
 181 extern int ppc_frob_symbol PARAMS ((struct symbol *));
 182
 183 /* Finish up the entire symtab.  */
 184 #define tc_adjust_symtab() ppc_adjust_symtab ()
 185 extern void ppc_adjust_symtab PARAMS ((void));
 186
 187 /* Niclas Andersson <nican@ida.liu.se> says this is needed.  */
 188 #define SUB_SEGMENT_ALIGN(SEG) 2
 189
 190 #endif /* OBJ_XCOFF */
 191
 192 #ifdef OBJ_ELF
 193
 194 /* Branch prediction relocations must force relocation.  */
 195 #define TC_FORCE_RELOCATION_SECTION(FIXP,SEC)                           \
 196 ((FIXP)->fx_r_type == BFD_RELOC_PPC_B16_BRTAKEN                         \
 197  || (FIXP)->fx_r_type == BFD_RELOC_PPC_B16_BRNTAKEN                     \
 198  || (FIXP)->fx_r_type == BFD_RELOC_PPC_BA16_BRTAKEN                     \
 199  || (FIXP)->fx_r_type == BFD_RELOC_PPC_BA16_BRNTAKEN                    \
 200  || ((FIXP)->fx_addsy && !(FIXP)->fx_subsy && (FIXP)->fx_addsy->bsym    \
 201      && (FIXP)->fx_addsy->bsym->section != SEC))
 202
 203 /* Support for SHF_EXCLUDE and SHT_ORDERED */
 204 extern int ppc_section_letter PARAMS ((int, char **));
 205 extern int ppc_section_type PARAMS ((char **));
 206 extern int ppc_section_word PARAMS ((char **));
 207 extern int ppc_section_flags PARAMS ((int, int, int));
 208
 209 #define md_elf_section_letter(LETTER, PTR_MSG)  ppc_section_letter (LETTER, PTR_MSG)
 210 #define md_elf_section_type(PTR_STR)            ppc_section_type (PTR_STR)
 211 #define md_elf_section_word(PTR_STR)            ppc_section_word (PTR_STR)
 212 #define md_elf_section_flags(FLAGS, ATTR, TYPE) ppc_section_flags (FLAGS, ATTR, TYPE)
 213
 214 /* Add extra PPC sections -- Note, for now, make .sbss2 and .PPC.EMB.sbss0 a
 215    normal section, and not a bss section so that the linker doesn't crater
 216    when trying to make more than 2 sections.  */
 217 #define ELF_TC_SPECIAL_SECTIONS \
 218   { ".tags",            SHT_ORDERED,    SHF_ALLOC }, \
 219   { ".sdata",           SHT_PROGBITS,   SHF_ALLOC + SHF_WRITE }, \
 220   { ".sbss",            SHT_NOBITS,     SHF_ALLOC + SHF_WRITE }, \
 221   { ".sdata2",          SHT_PROGBITS,   SHF_ALLOC }, \
 222   { ".sbss2",           SHT_PROGBITS,   SHF_ALLOC }, \
 223   { ".PPC.EMB.sdata0",  SHT_PROGBITS,   SHF_ALLOC }, \
 224   { ".PPC.EMB.sbss0",   SHT_PROGBITS,   SHF_ALLOC },
 225
 226 #define tc_comment_chars ppc_comment_chars
 227 extern const char *ppc_comment_chars;
 228
 229 /* Keep relocations relative to the GOT, or non-PC relative. */
 230 #define tc_fix_adjustable(FIX)                          \
 231   ((FIX)->fx_r_type != BFD_RELOC_16_GOTOFF              \
 232    && (FIX)->fx_r_type != BFD_RELOC_LO16_GOTOFF         \
 233    && (FIX)->fx_r_type != BFD_RELOC_HI16_GOTOFF         \
 234    && (FIX)->fx_r_type != BFD_RELOC_HI16_S_GOTOFF       \
 235    && (FIX)->fx_r_type != BFD_RELOC_GPREL16             \
 236    && ! S_IS_EXTERNAL ((FIX)->fx_addsy)                 \
 237    && ! S_IS_WEAK ((FIX)->fx_addsy)                     \
 238    && ((FIX)->fx_pcrel                                  \
 239        || ((FIX)->fx_subsy != NULL                      \
 240            && (S_GET_SEGMENT ((FIX)->fx_subsy)          \
 241                == S_GET_SEGMENT ((FIX)->fx_addsy)))))
 242
 243 /* We must never ever try to resolve references to externally visible
 244    symbols in the assembler, because the .o file might go into a shared
 245    library, and some other shared library might override that symbol.  */
 246 #define TC_RELOC_RTSYM_LOC_FIXUP(FIX)  \
 247   ((FIX)->fx_addsy == NULL \
 248    || (! S_IS_EXTERNAL ((FIX)->fx_addsy) \
 249        && ! S_IS_WEAK ((FIX)->fx_addsy) \
 250        && S_IS_DEFINED ((FIX)->fx_addsy) \
 251        && ! S_IS_COMMON ((FIX)->fx_addsy)))
 252
 253 #endif /* OBJ_ELF */
 254
 255 /* call md_apply_fix3 with segment instead of md_apply_fix */
 256 #define MD_APPLY_FIX3
 257
 258 /* call md_pcrel_from_section, not md_pcrel_from */
 259 #define MD_PCREL_FROM_SECTION(FIXP, SEC) md_pcrel_from_section(FIXP, SEC)
 260 extern long md_pcrel_from_section PARAMS ((struct fix *, segT));
 261
 262 #define md_parse_name(name, exp) ppc_parse_name (name, exp)
 263 extern int ppc_parse_name PARAMS ((const char *, struct expressionS *));
 264
 265 #define md_operand(x)
 266