gas/config/tc-ppc.h

   1 /* tc-ppc.h -- Header file for tc-ppc.c.
   2    Copyright (C) 1994, 1995, 1996 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 #ifndef BFD_ASSEMBLER
  25  #error PowerPC support requires BFD_ASSEMBLER
  26 #endif
  27
  28 /* If OBJ_COFF is defined, and TE_PE is not defined, we are assembling
  29    XCOFF for AIX or PowerMac.  If TE_PE is defined, we are assembling
  30    COFF for Windows NT.  */
  31
  32 #ifdef OBJ_COFF
  33 #ifndef TE_PE
  34 #define OBJ_XCOFF
  35 #endif
  36 #endif
  37
  38 /* The target BFD architecture.  */
  39 #define TARGET_ARCH (ppc_arch ())
  40 extern enum bfd_architecture ppc_arch PARAMS ((void));
  41
  42 /* Whether or not the target is big endian */
  43 extern int target_big_endian;
  44
  45 /* The target BFD format.  */
  46 #ifdef OBJ_COFF
  47 #ifdef TE_PE
  48 #define TARGET_FORMAT (target_big_endian ? "pe-powerpc" : "pe-powerpcle")
  49 #else
  50 #define TARGET_FORMAT "aixcoff-rs6000"
  51 #endif
  52 #endif
  53
  54 /* PowerMac has a BFD slightly different from AIX's.  */
  55 #ifdef TE_POWERMAC
  56 #ifdef TARGET_FORMAT
  57 #undef TARGET_FORMAT
  58 #endif
  59 #define TARGET_FORMAT "xcoff-powermac"
  60 #endif
  61
  62 #ifdef OBJ_ELF
  63 #define TARGET_FORMAT (target_big_endian ? "elf32-powerpc" : "elf32-powerpcle")
  64 #endif
  65
  66 /* Permit temporary numeric labels.  */
  67 #define LOCAL_LABELS_FB 1
  68
  69 /* $ is used to refer to the current location.  */
  70 #define DOLLAR_DOT
  71
  72 /* Strings do not use backslash escapes under COFF.  */
  73 #ifdef OBJ_COFF
  74 #define NO_STRING_ESCAPES
  75 #endif
  76
  77 /* When using COFF, we determine whether or not to output a symbol
  78    based on sy_tc.output, not on the name.  */
  79 #ifdef OBJ_XCOFF
  80 #define LOCAL_LABEL(name) 0
  81 #endif
  82 #ifdef OBJ_ELF
  83 /* When using ELF, local labels start with '.'.  */
  84 #define LOCAL_LABEL(name) (name[0] == '.' \
  85                            && (name[1] == 'L' || name[1] == '.'))
  86 #define FAKE_LABEL_NAME ".L0\001"
  87 #define DIFF_EXPR_OK            /* .-foo gets turned into PC relative relocs */
  88 #endif
  89
  90 /* Set the endianness we are using.  Default to big endian.  */
  91 #ifndef TARGET_BYTES_BIG_ENDIAN
  92 #define TARGET_BYTES_BIG_ENDIAN 1
  93 #endif
  94
  95 #if TARGET_BYTES_BIG_ENDIAN
  96 #define PPC_BIG_ENDIAN 1
  97 #else
  98 #define PPC_BIG_ENDIAN 0
  99 #endif
 100
 101 /* We don't need to handle .word strangely.  */
 102 #define WORKING_DOT_WORD
 103
 104 /* We set the fx_done field appropriately in md_apply_fix.  */
 105 #define TC_HANDLES_FX_DONE
 106 \f
 107 #ifdef TE_PE
 108
 109 /* Question marks are permitted in symbol names.  */
 110 #define LEX_QM 1
 111
 112 /* Don't adjust TOC relocs.  */
 113 #define tc_fix_adjustable(fixp) ppc_pe_fix_adjustable (fixp)
 114 extern int ppc_pe_fix_adjustable PARAMS ((struct fix *));
 115
 116 #endif
 117
 118 #ifdef OBJ_XCOFF
 119
 120 /* Declarations needed when generating XCOFF code.  XCOFF is an
 121    extension of COFF, used only on the RS/6000.  Rather than create an
 122    obj-xcoff, we just use obj-coff, and handle the extensions here in
 123    tc-ppc.  */
 124
 125 /* We need to keep some information for symbols.  */
 126 struct ppc_tc_sy
 127 {
 128   /* We keep a few linked lists of symbols.  */
 129   struct symbol *next;
 130   /* Non-zero if the symbol should be output.  The RS/6000 assembler
 131      only outputs symbols that are external or are mentioned in a
 132      .globl or .lglobl statement.  */
 133   int output;
 134   /* The symbol class.  */
 135   int class;
 136   /* The real name, if the symbol was renamed.  */
 137   char *real_name;
 138   /* For a csect symbol, the subsegment we are using.  This is zero
 139      for symbols that are not csects.  */
 140   subsegT subseg;
 141   /* For a csect or common symbol, the alignment to use.  */
 142   int align;
 143   /* For a function symbol, a symbol whose value is the size.  The
 144      field is NULL if there is no size.  */
 145   struct symbol *size;
 146   /* For a csect symbol, the last symbol which has been defined in
 147      this csect, or NULL if none have been defined so far.  For a .bs
 148      symbol, the referenced csect symbol.  */
 149   struct symbol *within;
 150 };
 151
 152 #define TC_SYMFIELD_TYPE struct ppc_tc_sy
 153
 154 /* We need an additional auxent for function symbols.  */
 155 #define OBJ_COFF_MAX_AUXENTRIES 2
 156
 157 /* Square and curly brackets are permitted in symbol names.  */
 158 #define LEX_BR 3
 159
 160 /* Canonicalize the symbol name.  */
 161 #define tc_canonicalize_symbol_name(name) ppc_canonicalize_symbol_name (name)
 162 extern char *ppc_canonicalize_symbol_name PARAMS ((char *));
 163
 164 /* Get the symbol class from the name.  */
 165 #define tc_symbol_new_hook(sym) ppc_symbol_new_hook (sym)
 166 extern void ppc_symbol_new_hook PARAMS ((struct symbol *));
 167
 168 /* Set the symbol class of a label based on the csect.  */
 169 #define tc_frob_label(sym) ppc_frob_label (sym)
 170 extern void ppc_frob_label PARAMS ((struct symbol *));
 171
 172 /* TOC relocs requires special handling.  */
 173 #define tc_fix_adjustable(fixp) ppc_fix_adjustable (fixp)
 174 extern int ppc_fix_adjustable PARAMS ((struct fix *));
 175
 176 /* A relocation from one csect to another must be kept.  */
 177 #define TC_FORCE_RELOCATION(FIXP) ppc_force_relocation (FIXP)
 178 extern int ppc_force_relocation PARAMS ((struct fix *));
 179
 180 /* We need to set the section VMA.  */
 181 #define tc_frob_section(sec) ppc_frob_section (sec)
 182 extern void ppc_frob_section PARAMS ((asection *));
 183
 184 /* Finish up the symbol.  */
 185 #define tc_frob_symbol(sym, punt) punt = ppc_frob_symbol (sym)
 186 extern int ppc_frob_symbol PARAMS ((struct symbol *));
 187
 188 /* Finish up the entire symtab.  */
 189 #define tc_adjust_symtab() ppc_adjust_symtab ()
 190 extern void ppc_adjust_symtab PARAMS ((void));
 191
 192 /* Niclas Andersson <nican@ida.liu.se> says this is needed.  */
 193 #define SUB_SEGMENT_ALIGN(SEG) 2
 194
 195 #endif /* OBJ_XCOFF */
 196
 197 #ifdef OBJ_ELF
 198 /* The name of the global offset table generated by the compiler. Allow
 199    this to be overridden if need be. */
 200 #ifndef GLOBAL_OFFSET_TABLE_NAME
 201 #define GLOBAL_OFFSET_TABLE_NAME "_GLOBAL_OFFSET_TABLE_"
 202 #endif
 203
 204 /* Branch prediction relocations must force relocation */
 205 #define TC_FORCE_RELOCATION_SECTION(FIXP,SEC)                           \
 206 ((FIXP)->fx_r_type == BFD_RELOC_PPC_B16_BRTAKEN                         \
 207  || (FIXP)->fx_r_type == BFD_RELOC_PPC_B16_BRNTAKEN                     \
 208  || (FIXP)->fx_r_type == BFD_RELOC_PPC_BA16_BRTAKEN                     \
 209  || (FIXP)->fx_r_type == BFD_RELOC_PPC_BA16_BRNTAKEN                    \
 210  || ((FIXP)->fx_addsy && !(FIXP)->fx_subsy && (FIXP)->fx_addsy->bsym    \
 211      && (FIXP)->fx_addsy->bsym->section != SEC))
 212
 213 /* Support for SHF_EXCLUDE and SHT_ORDERED */
 214 extern int ppc_section_letter PARAMS ((int, char **));
 215 extern int ppc_section_type PARAMS ((char **));
 216 extern int ppc_section_word PARAMS ((char **));
 217 extern int ppc_section_flags PARAMS ((int, int, int));
 218
 219 #define md_elf_section_letter(LETTER, PTR_MSG)  ppc_section_letter (LETTER, PTR_MSG)
 220 #define md_elf_section_type(PTR_STR)            ppc_section_type (PTR_STR)
 221 #define md_elf_section_word(PTR_STR)            ppc_section_word (PTR_STR)
 222 #define md_elf_section_flags(FLAGS, ATTR, TYPE) ppc_section_flags (FLAGS, ATTR, TYPE)
 223
 224 /* Add extra PPC sections -- Note, for now, make .sbss2 and .PPC.EMB.sbss0 a
 225    normal section, and not a bss section so that the linker doesn't crater
 226    when trying to make more than 2 sections.  */
 227 #define ELF_TC_SPECIAL_SECTIONS \
 228   { ".tags",            SHT_ORDERED,    SHF_ALLOC }, \
 229   { ".sdata",           SHT_PROGBITS,   SHF_ALLOC + SHF_WRITE }, \
 230   { ".sbss",            SHT_NOBITS,     SHF_ALLOC + SHF_WRITE }, \
 231   { ".sdata2",          SHT_PROGBITS,   SHF_ALLOC }, \
 232   { ".sbss2",           SHT_PROGBITS,   SHF_ALLOC }, \
 233   { ".PPC.EMB.sdata0",  SHT_PROGBITS,   SHF_ALLOC }, \
 234   { ".PPC.EMB.sbss0",   SHT_PROGBITS,   SHF_ALLOC },
 235
 236 #define tc_comment_chars ppc_comment_chars
 237 extern const char *ppc_comment_chars;
 238
 239 #endif /* OBJ_ELF */
 240
 241 /* call md_apply_fix3 with segment instead of md_apply_fix */
 242 #define MD_APPLY_FIX3
 243
 244 /* call md_pcrel_from_section, not md_pcrel_from */
 245 #define MD_PCREL_FROM_SECTION(FIXP, SEC) md_pcrel_from_section(FIXP, SEC)
 246
 247 #define md_parse_name(name, exp) ppc_parse_name (name, exp)
 248 extern int ppc_parse_name PARAMS ((const char *, struct expressionS *));
 249
 250 #define md_operand(x)
 251