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.  If TE_PE is defined, we are assembling COFF for
  29    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 #ifdef OBJ_ELF
  54 #define TARGET_FORMAT (target_big_endian ? "elf32-powerpc" : "elf32-powerpcle")
  55 #endif
  56
  57 /* Permit temporary numeric labels.  */
  58 #define LOCAL_LABELS_FB 1
  59
  60 /* $ is used to refer to the current location.  */
  61 #define DOLLAR_DOT
  62
  63 /* Strings do not use backslash escapes under COFF.  */
  64 #ifdef OBJ_COFF
  65 #define NO_STRING_ESCAPES
  66 #endif
  67
  68 /* When using COFF, we determine whether or not to output a symbol
  69    based on sy_tc.output, not on the name.  */
  70 #ifdef OBJ_XCOFF
  71 #define LOCAL_LABEL(name) 0
  72 #endif
  73 #ifdef OBJ_ELF
  74 /* When using ELF, local labels start with '.'.  */
  75 #define LOCAL_LABEL(name) (name[0] == '.' \
  76                            && (name[1] == 'L' || name[1] == '.'))
  77 #define FAKE_LABEL_NAME ".L0\001"
  78 #define DIFF_EXPR_OK            /* .-foo gets turned into PC relative relocs */
  79 #endif
  80
  81 /* Set the endianness we are using.  Default to big endian.  */
  82 #ifndef TARGET_BYTES_BIG_ENDIAN
  83 #ifndef TARGET_BYTES_LITTLE_ENDIAN
  84 #define TARGET_BYTES_BIG_ENDIAN 1
  85 #endif
  86 #endif
  87
  88 #ifdef TARGET_BYTES_BIG_ENDIAN
  89 #define PPC_BIG_ENDIAN 1
  90 #else
  91 #define PPC_BIG_ENDIAN 0
  92 #endif
  93
  94 /* We don't need to handle .word strangely.  */
  95 #define WORKING_DOT_WORD
  96
  97 /* We set the fx_done field appropriately in md_apply_fix.  */
  98 #define TC_HANDLES_FX_DONE
  99 \f
 100 #ifdef TE_PE
 101
 102 /* Question marks are permitted in symbol names.  */
 103 #define LEX_QM 1
 104
 105 #endif
 106
 107 #ifdef OBJ_XCOFF
 108
 109 /* Declarations needed when generating XCOFF code.  XCOFF is an
 110    extension of COFF, used only on the RS/6000.  Rather than create an
 111    obj-xcoff, we just use obj-coff, and handle the extensions here in
 112    tc-ppc.  */
 113
 114 /* We need to keep some information for symbols.  */
 115 struct ppc_tc_sy
 116 {
 117   /* We keep a few linked lists of symbols.  */
 118   struct symbol *next;
 119   /* Non-zero if the symbol should be output.  The RS/6000 assembler
 120      only outputs symbols that are external or are mentioned in a
 121      .globl or .lglobl statement.  */
 122   int output;
 123   /* The symbol class.  */
 124   int class;
 125   /* The real name, if the symbol was renamed.  */
 126   char *real_name;
 127   /* For a csect symbol, the subsegment we are using.  This is zero
 128      for symbols that are not csects.  */
 129   subsegT subseg;
 130   /* For a csect or common symbol, the alignment to use.  */
 131   int align;
 132   /* For a function symbol, a symbol whose value is the size.  The
 133      field is NULL if there is no size.  */
 134   struct symbol *size;
 135   /* For a csect symbol, the last symbol which has been defined in
 136      this csect, or NULL if none have been defined so far.  For a .bs
 137      symbol, the referenced csect symbol.  */
 138   struct symbol *within;
 139 };
 140
 141 #define TC_SYMFIELD_TYPE struct ppc_tc_sy
 142
 143 /* We need an additional auxent for function symbols.  */
 144 #define OBJ_COFF_MAX_AUXENTRIES 2
 145
 146 /* Square and curly brackets are permitted in symbol names.  */
 147 #define LEX_BR 3
 148
 149 /* Canonicalize the symbol name.  */
 150 #define tc_canonicalize_symbol_name(name) ppc_canonicalize_symbol_name (name)
 151 extern char *ppc_canonicalize_symbol_name PARAMS ((char *));
 152
 153 /* Get the symbol class from the name.  */
 154 #define tc_symbol_new_hook(sym) ppc_symbol_new_hook (sym)
 155 extern void ppc_symbol_new_hook PARAMS ((struct symbol *));
 156
 157 /* Set the symbol class of a label based on the csect.  */
 158 #define tc_frob_label(sym) ppc_frob_label (sym)
 159 extern void ppc_frob_label PARAMS ((struct symbol *));
 160
 161 /* TOC relocs requires special handling.  */
 162 #define tc_fix_adjustable(fixp) ppc_fix_adjustable (fixp)
 163 extern int ppc_fix_adjustable PARAMS ((struct fix *));
 164
 165 /* We need to set the section VMA.  */
 166 #define tc_frob_section(sec) ppc_frob_section (sec)
 167 extern void ppc_frob_section PARAMS ((asection *));
 168
 169 /* Finish up the symbol.  */
 170 #define tc_frob_symbol(sym, punt) punt = ppc_frob_symbol (sym)
 171 extern int ppc_frob_symbol PARAMS ((struct symbol *));
 172
 173 /* Niclas Andersson <nican@ida.liu.se> says this is needed.  */
 174 #define SUB_SEGMENT_ALIGN(SEG) 2
 175
 176 /* Finish up the file.  */
 177 #define tc_frob_file() ppc_frob_file ()
 178 extern void ppc_frob_file PARAMS ((void));
 179
 180 #endif /* OBJ_XCOFF */
 181
 182 #ifdef OBJ_ELF
 183 /* The name of the global offset table generated by the compiler. Allow
 184    this to be overridden if need be. */
 185 #ifndef GLOBAL_OFFSET_TABLE_NAME
 186 #define GLOBAL_OFFSET_TABLE_NAME "_GLOBAL_OFFSET_TABLE_"
 187 #endif
 188
 189 /* Branch prediction relocations must force relocation */
 190 #define TC_FORCE_RELOCATION(FIXP)                                       \
 191 ((FIXP)->fx_r_type == BFD_RELOC_PPC_B16_BRTAKEN                         \
 192  || (FIXP)->fx_r_type == BFD_RELOC_PPC_B16_BRNTAKEN                     \
 193  || (FIXP)->fx_r_type == BFD_RELOC_PPC_BA16_BRTAKEN                     \
 194  || (FIXP)->fx_r_type == BFD_RELOC_PPC_BA16_BRNTAKEN)
 195
 196 #endif /* OBJ_ELF */
 197
 198 /* call md_apply_fix3 with segment instead of md_apply_fix */
 199 #define MD_APPLY_FIX3
 200
 201 #define md_operand(x)