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, 675 Mass Ave, Cambridge, MA 02139, 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 /* The target BFD format.  */
  32 #ifdef OBJ_COFF
  33 #define TARGET_FORMAT "aixcoff-rs6000"
  34 #endif
  35 #ifdef OBJ_ELF
  36 #define TARGET_FORMAT "elf32-powerpc"
  37 #endif
  38
  39 /* Permit temporary numeric labels.  */
  40 #define LOCAL_LABELS_FB 1
  41
  42 /* $ is used to refer to the current location.  */
  43 #define DOLLAR_DOT
  44
  45 /* Strings do not use backslash escapes under COFF.  */
  46 #ifdef OBJ_COFF
  47 #define NO_STRING_ESCAPES
  48 #endif
  49
  50 /* When using COFF, we determine whether or not to output a symbol
  51    based on sy_tc.output, not on the name.  */
  52 #ifdef OBJ_COFF
  53 #define LOCAL_LABEL(name) 0
  54 #endif
  55 #ifdef OBJ_ELF
  56 /* When using ELF, local labels start with '.'.  */
  57 #define LOCAL_LABEL(name) (name[0] == '.' \
  58                            && (name[1] == 'L' || name[1] == '.'))
  59 #define FAKE_LABEL_NAME ".L0\001"
  60 #define DIFF_EXPR_OK            /* .-foo gets turned into PC relative relocs */
  61 #endif
  62
  63 /* Set the endianness we are using.  Default to big endian.  */
  64 #ifndef TARGET_BYTES_BIG_ENDIAN
  65 #ifndef TARGET_BYTES_LITTLE_ENDIAN
  66 #define TARGET_BYTES_BIG_ENDIAN
  67 #endif
  68 #endif
  69
  70 #ifdef TARGET_BYTES_BIG_ENDIAN
  71 #define PPC_BIG_ENDIAN 1
  72 #else
  73 #define PPC_BIG_ENDIAN 0
  74 #endif
  75
  76 /* We don't need to handle .word strangely.  */
  77 #define WORKING_DOT_WORD
  78
  79 /* We set the fx_done field appropriately in md_apply_fix.  */
  80 #define TC_HANDLES_FX_DONE
  81 \f
  82 #ifdef OBJ_COFF
  83
  84 /* Declarations needed when generating XCOFF code.  XCOFF is an
  85    extension of COFF, used only on the RS/6000.  Rather than create an
  86    obj-xcoff, we just use obj-coff, and handle the extensions here in
  87    tc-ppc.  */
  88
  89 /* We need to keep some information for symbols.  */
  90 struct ppc_tc_sy
  91 {
  92   /* We keep a few linked lists of symbols.  */
  93   struct symbol *next;
  94   /* Non-zero if the symbol should be output.  The RS/6000 assembler
  95      only outputs symbols that are external or are mentioned in a
  96      .globl or .lglobl statement.  */
  97   int output;
  98   /* The symbol class.  */
  99   int class;
 100   /* The real name, if the symbol was renamed.  */
 101   char *real_name;
 102   /* For a csect symbol, the subsegment we are using.  This is zero
 103      for symbols that are not csects.  */
 104   subsegT subseg;
 105   /* For a csect or common symbol, the alignment to use.  */
 106   int align;
 107   /* For a function symbol, a symbol whose value is the size.  The
 108      field is NULL if there is no size.  */
 109   struct symbol *size;
 110   /* For a csect symbol, the last symbol which has been defined in
 111      this csect, or NULL if none have been defined so far.  For a .bs
 112      symbol, the referenced csect symbol.  */
 113   struct symbol *within;
 114 };
 115
 116 #define TC_SYMFIELD_TYPE struct ppc_tc_sy
 117
 118 /* We need an additional auxent for function symbols.  */
 119 #define OBJ_COFF_MAX_AUXENTRIES 2
 120
 121 /* Square and curly brackets are permitted in symbol names.  */
 122 #define LEX_BR 3
 123
 124 /* Canonicalize the symbol name.  */
 125 #define tc_canonicalize_symbol_name(name) ppc_canonicalize_symbol_name (name)
 126 extern char *ppc_canonicalize_symbol_name PARAMS ((char *));
 127
 128 /* Get the symbol class from the name.  */
 129 #define tc_symbol_new_hook(sym) ppc_symbol_new_hook (sym)
 130 extern void ppc_symbol_new_hook PARAMS ((struct symbol *));
 131
 132 /* Set the symbol class of a label based on the csect.  */
 133 #define tc_frob_label(sym) ppc_frob_label (sym)
 134 extern void ppc_frob_label PARAMS ((struct symbol *));
 135
 136 /* TOC relocs requires special handling.  */
 137 #define tc_fix_adjustable(fixp) ppc_fix_adjustable (fixp)
 138 extern int ppc_fix_adjustable PARAMS ((struct fix *));
 139
 140 /* We need to set the section VMA.  */
 141 #define tc_frob_section(sec) ppc_frob_section (sec)
 142 extern void ppc_frob_section PARAMS ((asection *));
 143
 144 /* Finish up the symbol.  */
 145 #define tc_frob_symbol(sym, punt) punt = ppc_frob_symbol (sym)
 146 extern int ppc_frob_symbol PARAMS ((struct symbol *));
 147
 148 /* Finish up the file.  */
 149 #define tc_frob_file() ppc_frob_file ()
 150 extern void ppc_frob_file PARAMS ((void));
 151
 152 #endif /* OBJ_COFF */
 153
 154 #ifdef OBJ_ELF
 155 /* The name of the global offset table generated by the compiler. Allow
 156    this to be overridden if need be. */
 157 #ifndef GLOBAL_OFFSET_TABLE_NAME
 158 #define GLOBAL_OFFSET_TABLE_NAME "_GLOBAL_OFFSET_TABLE_"
 159 #endif
 160 #endif /* OBJ_ELF */
 161
 162 /* call md_apply_fix3 with segment instead of md_apply_fix */
 163 #define MD_APPLY_FIX3
 164
 165 #define md_operand(x)