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 /* The target BFD architecture.  */
  28 #define TARGET_ARCH (ppc_arch ())
  29 extern enum bfd_architecture ppc_arch PARAMS ((void));
  30
  31 /* Whether or not the target is big endian */
  32 extern int target_big_endian;
  33
  34 /* The target BFD format.  */
  35 #ifdef OBJ_COFF
  36 #ifdef TE_PE
  37 #define TARGET_FORMAT (target_big_endian) ? "pe-powerpc" : "pe-powerpcle"
  38 #elif defined(PPC)
  39 #define TARGET_FORMAT (target_big_endian) ? "coff-powerpc" : "coff-powerpcle"
  40 #else
  41 #define TARGET_FORMAT "aixcoff-rs6000"
  42 #endif
  43 #endif
  44
  45 #ifdef OBJ_ELF
  46 #define TARGET_FORMAT (target_big_endian) ? "elf32-powerpc" : "elf32-powerpcle"
  47 #endif
  48
  49 /* Permit temporary numeric labels.  */
  50 #define LOCAL_LABELS_FB 1
  51
  52 /* $ is used to refer to the current location.  */
  53 #define DOLLAR_DOT
  54
  55 /* Strings do not use backslash escapes under COFF.  */
  56 #ifdef OBJ_COFF
  57 #define NO_STRING_ESCAPES
  58 #endif
  59
  60 /* When using COFF, we determine whether or not to output a symbol
  61    based on sy_tc.output, not on the name.  */
  62 #ifdef OBJ_COFF
  63 #define LOCAL_LABEL(name) 0
  64 #endif
  65 #ifdef OBJ_ELF
  66 /* When using ELF, local labels start with '.'.  */
  67 #define LOCAL_LABEL(name) (name[0] == '.' \
  68                            && (name[1] == 'L' || name[1] == '.'))
  69 #define FAKE_LABEL_NAME ".L0\001"
  70 #define DIFF_EXPR_OK            /* .-foo gets turned into PC relative relocs */
  71 #endif
  72
  73 /* Set the endianness we are using.  Default to big endian.  */
  74 #ifndef TARGET_BYTES_BIG_ENDIAN
  75 #ifndef TARGET_BYTES_LITTLE_ENDIAN
  76 #define TARGET_BYTES_BIG_ENDIAN 1
  77 #endif
  78 #endif
  79
  80 #ifdef TARGET_BYTES_BIG_ENDIAN
  81 #define PPC_BIG_ENDIAN 1
  82 #else
  83 #define PPC_BIG_ENDIAN 0
  84 #endif
  85
  86 /* We don't need to handle .word strangely.  */
  87 #define WORKING_DOT_WORD
  88
  89 /* We set the fx_done field appropriately in md_apply_fix.  */
  90 #define TC_HANDLES_FX_DONE
  91 \f
  92 #ifdef OBJ_COFF
  93
  94 /* Declarations needed when generating XCOFF code.  XCOFF is an
  95    extension of COFF, used only on the RS/6000.  Rather than create an
  96    obj-xcoff, we just use obj-coff, and handle the extensions here in
  97    tc-ppc.  */
  98
  99 /* We need to keep some information for symbols.  */
 100 struct ppc_tc_sy
 101 {
 102   /* We keep a few linked lists of symbols.  */
 103   struct symbol *next;
 104   /* Non-zero if the symbol should be output.  The RS/6000 assembler
 105      only outputs symbols that are external or are mentioned in a
 106      .globl or .lglobl statement.  */
 107   int output;
 108   /* The symbol class.  */
 109   int class;
 110   /* The real name, if the symbol was renamed.  */
 111   char *real_name;
 112   /* For a csect symbol, the subsegment we are using.  This is zero
 113      for symbols that are not csects.  */
 114   subsegT subseg;
 115   /* For a csect or common symbol, the alignment to use.  */
 116   int align;
 117   /* For a function symbol, a symbol whose value is the size.  The
 118      field is NULL if there is no size.  */
 119   struct symbol *size;
 120   /* For a csect symbol, the last symbol which has been defined in
 121      this csect, or NULL if none have been defined so far.  For a .bs
 122      symbol, the referenced csect symbol.  */
 123   struct symbol *within;
 124 };
 125
 126 #define TC_SYMFIELD_TYPE struct ppc_tc_sy
 127
 128 /* We need an additional auxent for function symbols.  */
 129 #define OBJ_COFF_MAX_AUXENTRIES 2
 130
 131 /* Square and curly brackets are permitted in symbol names.  */
 132 #define LEX_BR 3
 133
 134 /* Canonicalize the symbol name.  */
 135 #define tc_canonicalize_symbol_name(name) ppc_canonicalize_symbol_name (name)
 136 extern char *ppc_canonicalize_symbol_name PARAMS ((char *));
 137
 138 /* Get the symbol class from the name.  */
 139 #define tc_symbol_new_hook(sym) ppc_symbol_new_hook (sym)
 140 extern void ppc_symbol_new_hook PARAMS ((struct symbol *));
 141
 142 /* Set the symbol class of a label based on the csect.  */
 143 #define tc_frob_label(sym) ppc_frob_label (sym)
 144 extern void ppc_frob_label PARAMS ((struct symbol *));
 145
 146 /* TOC relocs requires special handling.  */
 147 #define tc_fix_adjustable(fixp) ppc_fix_adjustable (fixp)
 148 extern int ppc_fix_adjustable PARAMS ((struct fix *));
 149
 150 /* We need to set the section VMA.  */
 151 #define tc_frob_section(sec) ppc_frob_section (sec)
 152 extern void ppc_frob_section PARAMS ((asection *));
 153
 154 /* Finish up the symbol.  */
 155 #define tc_frob_symbol(sym, punt) punt = ppc_frob_symbol (sym)
 156 extern int ppc_frob_symbol PARAMS ((struct symbol *));
 157
 158 /* Niclas Andersson <nican@ida.liu.se> says this is needed.  */
 159 #define SUB_SEGMENT_ALIGN(SEG) 2
 160
 161 /* Finish up the file.  */
 162 #define tc_frob_file() ppc_frob_file ()
 163 extern void ppc_frob_file PARAMS ((void));
 164
 165 #endif /* OBJ_COFF */
 166
 167 #ifdef OBJ_ELF
 168 /* The name of the global offset table generated by the compiler. Allow
 169    this to be overridden if need be. */
 170 #ifndef GLOBAL_OFFSET_TABLE_NAME
 171 #define GLOBAL_OFFSET_TABLE_NAME "_GLOBAL_OFFSET_TABLE_"
 172 #endif
 173
 174 /* Branch prediction relocations must force relocation */
 175 #define TC_FORCE_RELOCATION(FIXP)                                       \
 176 ((FIXP)->fx_r_type == BFD_RELOC_PPC_B16_BRTAKEN                         \
 177  || (FIXP)->fx_r_type == BFD_RELOC_PPC_B16_BRNTAKEN                     \
 178  || (FIXP)->fx_r_type == BFD_RELOC_PPC_BA16_BRTAKEN                     \
 179  || (FIXP)->fx_r_type == BFD_RELOC_PPC_BA16_BRNTAKEN)
 180
 181 #endif /* OBJ_ELF */
 182
 183 /* call md_apply_fix3 with segment instead of md_apply_fix */
 184 #define MD_APPLY_FIX3
 185
 186 #define md_operand(x)