gas/config/tc-ppc.h

   1 /* tc-ppc.h -- Header file for tc-ppc.c.
   2    Copyright (C) 1994 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
  19    the Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
  20
  21 #define TC_PPC
  22
  23 #ifndef BFD_ASSEMBLER
  24  #error PowerPC support requires BFD_ASSEMBLER
  25 #endif
  26
  27 /* If OBJ_COFF is defined, and TE_PE is not defined, we are assembling
  28    XCOFF for AIX or PowerMac.  If TE_PE is defined, we are assembling
  29    COFF for Windows NT.  */
  30
  31 #ifdef OBJ_COFF
  32 #ifndef TE_PE
  33 #define OBJ_XCOFF
  34 #endif
  35 #endif
  36
  37 /* The target BFD architecture.  */
  38 #define TARGET_ARCH (ppc_arch ())
  39 extern enum bfd_architecture ppc_arch PARAMS ((void));
  40
  41 /* Whether or not the target is big endian */
  42 extern int target_big_endian;
  43
  44 /* The target BFD format.  */
  45 #ifdef OBJ_COFF
  46 #ifdef TE_PE
  47 #define TARGET_FORMAT (target_big_endian ? "pe-powerpc" : "pe-powerpcle")
  48 #else
  49 #define TARGET_FORMAT "aixcoff-rs6000"
  50 #endif
  51 #endif
  52
  53 /* PowerMac has a BFD slightly different from AIX's.  */
  54 #ifdef TE_POWERMAC
  55 #ifdef TARGET_FORMAT
  56 #undef TARGET_FORMAT
  57 #endif
  58 #define TARGET_FORMAT "xcoff-powermac"
  59 #endif
  60
  61 #ifdef OBJ_ELF
  62 #define TARGET_FORMAT (target_big_endian ? "elf32-powerpc" : "elf32-powerpcle")
  63 #endif
  64
  65 /* Permit temporary numeric labels.  */
  66 #define LOCAL_LABELS_FB 1
  67
  68 /* $ is used to refer to the current location.  */
  69 #define DOLLAR_DOT
  70
  71 /* Strings do not use backslash escapes under COFF.  */
  72 #ifdef OBJ_COFF
  73 #define NO_STRING_ESCAPES
  74 #endif
  75
  76 /* When using COFF, we determine whether or not to output a symbol
  77    based on sy_tc.output, not on the name.  */
  78 #ifdef OBJ_XCOFF
  79 #define LOCAL_LABEL(name) 0
  80 #endif
  81 #ifdef OBJ_ELF
  82 /* When using ELF, local labels start with '.'.  */
  83 #define LOCAL_LABEL(name) (name[0] == '.' \
  84                            && (name[1] == 'L' || name[1] == '.'))
  85 #define FAKE_LABEL_NAME ".L0\001"
  86 #define DIFF_EXPR_OK            /* .-foo gets turned into PC relative relocs */
  87 #endif
  88
  89 /* Set the endianness we are using.  Default to big endian.  */
  90 #ifndef TARGET_BYTES_BIG_ENDIAN
  91 #ifndef TARGET_BYTES_LITTLE_ENDIAN
  92 #define TARGET_BYTES_BIG_ENDIAN 1
  93 #endif
  94 #endif
  95
  96 #ifdef TARGET_BYTES_BIG_ENDIAN
  97 #define PPC_BIG_ENDIAN 1
  98 #else
  99 #define PPC_BIG_ENDIAN 0
 100 #endif
 101
 102 /* We don't need to handle .word strangely.  */
 103 #define WORKING_DOT_WORD
 104
 105 /* We set the fx_done field appropriately in md_apply_fix.  */
 106 #define TC_HANDLES_FX_DONE
 107 \f
 108 #ifdef TE_PE
 109
 110 /* Question marks are permitted in symbol names.  */
 111 #define LEX_QM 1
 112
 113 /* Don't adjust TOC relocs.  */
 114 #define tc_fix_adjustable(fixp) ppc_pe_fix_adjustable (fixp)
 115 extern int ppc_pe_fix_adjustable PARAMS ((struct fix *));
 116
 117 #endif
 118
 119 #ifdef OBJ_XCOFF
 120
 121 /* Declarations needed when generating XCOFF code.  XCOFF is an
 122    extension of COFF, used only on the RS/6000.  Rather than create an
 123    obj-xcoff, we just use obj-coff, and handle the extensions here in
 124    tc-ppc.  */
 125
 126 /* We need to keep some information for symbols.  */
 127 struct ppc_tc_sy
 128 {
 129   /* We keep a few linked lists of symbols.  */
 130   struct symbol *next;
 131   /* Non-zero if the symbol should be output.  The RS/6000 assembler
 132      only outputs symbols that are external or are mentioned in a
 133      .globl or .lglobl statement.  */
 134   int output;
 135   /* The symbol class.  */
 136   int class;
 137   /* The real name, if the symbol was renamed.  */
 138   char *real_name;
 139   /* For a csect symbol, the subsegment we are using.  This is zero
 140      for symbols that are not csects.  */
 141   subsegT subseg;
 142   /* For a csect or common symbol, the alignment to use.  */
 143   int align;
 144   /* For a function symbol, a symbol whose value is the size.  The
 145      field is NULL if there is no size.  */
 146   struct symbol *size;
 147   /* For a csect symbol, the last symbol which has been defined in
 148      this csect, or NULL if none have been defined so far.  For a .bs
 149      symbol, the referenced csect symbol.  */
 150   struct symbol *within;
 151 };
 152
 153 #define TC_SYMFIELD_TYPE struct ppc_tc_sy
 154
 155 /* We need an additional auxent for function symbols.  */
 156 #define OBJ_COFF_MAX_AUXENTRIES 2
 157
 158 /* Square and curly brackets are permitted in symbol names.  */
 159 #define LEX_BR 3
 160
 161 /* Canonicalize the symbol name.  */
 162 #define tc_canonicalize_symbol_name(name) ppc_canonicalize_symbol_name (name)
 163 extern char *ppc_canonicalize_symbol_name PARAMS ((char *));
 164
 165 /* Get the symbol class from the name.  */
 166 #define tc_symbol_new_hook(sym) ppc_symbol_new_hook (sym)
 167 extern void ppc_symbol_new_hook PARAMS ((struct symbol *));
 168
 169 /* Set the symbol class of a label based on the csect.  */
 170 #define tc_frob_label(sym) ppc_frob_label (sym)
 171 extern void ppc_frob_label PARAMS ((struct symbol *));
 172
 173 /* TOC relocs requires special handling.  */
 174 #define tc_fix_adjustable(fixp) ppc_fix_adjustable (fixp)
 175 extern int ppc_fix_adjustable PARAMS ((struct fix *));
 176
 177 /* We need to set the section VMA.  */
 178 #define tc_frob_section(sec) ppc_frob_section (sec)
 179 extern void ppc_frob_section PARAMS ((asection *));
 180
 181 /* Finish up the symbol.  */
 182 #define tc_frob_symbol(sym, punt) punt = ppc_frob_symbol (sym)
 183 extern int ppc_frob_symbol PARAMS ((struct symbol *));
 184
 185 /* Finish up the entire symtab.  */
 186 #define tc_adjust_symtab() ppc_adjust_symtab ()
 187 extern void ppc_adjust_symtab PARAMS ((void));
 188
 189 /* Niclas Andersson <nican@ida.liu.se> says this is needed.  */
 190 #define SUB_SEGMENT_ALIGN(SEG) 2
 191
 192 #endif /* OBJ_XCOFF */
 193
 194 #ifdef OBJ_ELF
 195 /* The name of the global offset table generated by the compiler. Allow
 196    this to be overridden if need be. */
 197 #ifndef GLOBAL_OFFSET_TABLE_NAME
 198 #define GLOBAL_OFFSET_TABLE_NAME "_GLOBAL_OFFSET_TABLE_"
 199 #endif
 200
 201 /* Branch prediction relocations must force relocation */
 202 #define TC_FORCE_RELOCATION_SECTION(FIXP,SEC)                           \
 203 ((FIXP)->fx_r_type == BFD_RELOC_PPC_B16_BRTAKEN                         \
 204  || (FIXP)->fx_r_type == BFD_RELOC_PPC_B16_BRNTAKEN                     \
 205  || (FIXP)->fx_r_type == BFD_RELOC_PPC_BA16_BRTAKEN                     \
 206  || (FIXP)->fx_r_type == BFD_RELOC_PPC_BA16_BRNTAKEN                    \
 207  || ((FIXP)->fx_addsy && !(FIXP)->fx_subsy && (FIXP)->fx_addsy->bsym    \
 208      && (FIXP)->fx_addsy->bsym->section != SEC))
 209
 210 /* Support for SHF_EXCLUDE and SHT_ORDERED */
 211 extern int ppc_section_letter PARAMS ((int, char **));
 212 extern int ppc_section_type PARAMS ((char **));
 213 extern int ppc_section_word PARAMS ((char **));
 214 extern int ppc_section_flags PARAMS ((int, int, int));
 215
 216 #define md_elf_section_letter(LETTER, PTR_MSG)  ppc_section_letter (LETTER, PTR_MSG)
 217 #define md_elf_section_type(PTR_STR)            ppc_section_type (PTR_STR)
 218 #define md_elf_section_word(PTR_STR)            ppc_section_word (PTR_STR)
 219 #define md_elf_section_flags(FLAGS, ATTR, TYPE) ppc_section_flags (FLAGS, ATTR, TYPE)
 220 #endif /* OBJ_ELF */
 221
 222 /* call md_apply_fix3 with segment instead of md_apply_fix */
 223 #define MD_APPLY_FIX3
 224
 225 /* call md_pcrel_from_section, not md_pcrel_from */
 226 #define MD_PCREL_FROM_SECTION(FIXP, SEC) md_pcrel_from_section(FIXP, SEC)
 227
 228 #define md_operand(x)
 229