gas/config/tc-ppc.h

   1 /* tc-ppc.h -- Header file for tc-ppc.c.
   2    Copyright 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003,
   3    2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc.
   4    Written by Ian Lance Taylor, Cygnus Support.
   5
   6    This file is part of GAS, the GNU Assembler.
   7
   8    GAS is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3, or (at your option)
  11    any later version.
  12
  13    GAS is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with GAS; see the file COPYING.  If not, write to the Free
  20    Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
  21    02110-1301, USA.  */
  22
  23 #define TC_PPC
  24
  25 struct fix;
  26
  27 /* Set the endianness we are using.  Default to big endian.  */
  28 #ifndef TARGET_BYTES_BIG_ENDIAN
  29 #define TARGET_BYTES_BIG_ENDIAN 1
  30 #endif
  31
  32 /* If OBJ_COFF is defined, and TE_PE is not defined, we are assembling
  33    XCOFF for AIX or PowerMac.  If TE_PE is defined, we are assembling
  34    COFF for Windows NT.  */
  35
  36 #ifdef OBJ_COFF
  37 #ifndef TE_PE
  38 #define OBJ_XCOFF
  39 #endif
  40 #endif
  41
  42 /* The target BFD architecture.  */
  43 #define TARGET_ARCH (ppc_arch ())
  44 #define TARGET_MACH (ppc_mach ())
  45 extern enum bfd_architecture ppc_arch (void);
  46 extern unsigned long ppc_mach (void);
  47
  48 /* Whether or not the target is big endian */
  49 extern int target_big_endian;
  50
  51 /* The target BFD format.  */
  52 #define TARGET_FORMAT (ppc_target_format ())
  53 extern char *ppc_target_format (void);
  54
  55 /* Permit temporary numeric labels.  */
  56 #define LOCAL_LABELS_FB 1
  57
  58 /* $ is used to refer to the current location.  */
  59 #define DOLLAR_DOT
  60
  61 /* Strings do not use backslash escapes under COFF.  */
  62 #ifdef OBJ_COFF
  63 #define NO_STRING_ESCAPES
  64 #endif
  65
  66 #ifdef OBJ_ELF
  67 #define DIFF_EXPR_OK            /* foo-. gets turned into PC relative relocs */
  68 #endif
  69
  70 #if 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 #define MAX_MEM_FOR_RS_ALIGN_CODE 4
  80 #define HANDLE_ALIGN(FRAGP)                                             \
  81   if ((FRAGP)->fr_type == rs_align_code)                                \
  82     ppc_handle_align (FRAGP);
  83
  84 extern void ppc_handle_align (struct frag *);
  85
  86 #define SUB_SEGMENT_ALIGN(SEG, FRCHAIN) 0
  87
  88 #define md_frag_check(FRAGP) \
  89   if ((FRAGP)->has_code                                                 \
  90       && (((FRAGP)->fr_address + (FRAGP)->insn_addr) & 3) != 0)         \
  91     as_bad_where ((FRAGP)->fr_file, (FRAGP)->fr_line,                   \
  92                   _("instruction address is not a multiple of 4"));
  93
  94 /* Arrange to store the value of ppc_cpu at the site of a fixup
  95    for later use in md_apply_fix.  */
  96 struct _ppc_fix_extra
  97 {
  98   unsigned long ppc_cpu;
  99 };
 100
 101 extern unsigned long ppc_cpu;
 102
 103 #define TC_FIX_TYPE struct _ppc_fix_extra
 104 #define TC_INIT_FIX_DATA(FIXP) \
 105   do { (FIXP)->tc_fix_data.ppc_cpu = ppc_cpu; } while (0)
 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(FIX) ppc_pe_fix_adjustable (FIX)
 114 extern int ppc_pe_fix_adjustable (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   symbolS *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   symbolS *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   symbolS *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 (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 (symbolS *);
 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 (symbolS *);
 171
 172 /* TOC relocs requires special handling.  */
 173 #define tc_fix_adjustable(FIX) ppc_fix_adjustable (FIX)
 174 extern int ppc_fix_adjustable (struct fix *);
 175
 176 /* We need to set the section VMA.  */
 177 #define tc_frob_section(sec) ppc_frob_section (sec)
 178 extern void ppc_frob_section (asection *);
 179
 180 /* Finish up the symbol.  */
 181 #define tc_frob_symbol(sym, punt) punt = ppc_frob_symbol (sym)
 182 extern int ppc_frob_symbol (symbolS *);
 183
 184 /* Finish up the entire symtab.  */
 185 #define tc_adjust_symtab() ppc_adjust_symtab ()
 186 extern void ppc_adjust_symtab (void);
 187
 188 /* We also need to copy, in particular, the class of the symbol,
 189    over what obj-coff would otherwise have copied.  */
 190 #define OBJ_COPY_SYMBOL_ATTRIBUTES(dest,src)                    \
 191 do {                                                            \
 192   if (SF_GET_GET_SEGMENT (dest))                                \
 193     S_SET_SEGMENT (dest, S_GET_SEGMENT (src));                  \
 194   symbol_get_tc (dest)->size = symbol_get_tc (src)->size;       \
 195   symbol_get_tc (dest)->align = symbol_get_tc (src)->align;     \
 196   symbol_get_tc (dest)->class = symbol_get_tc (src)->class;     \
 197   symbol_get_tc (dest)->within = symbol_get_tc (src)->within;   \
 198 } while (0)
 199
 200 #endif /* OBJ_XCOFF */
 201
 202 extern const char       ppc_symbol_chars[];
 203 #define tc_symbol_chars ppc_symbol_chars
 204
 205 #ifdef OBJ_ELF
 206
 207 /* Support for SHF_EXCLUDE and SHT_ORDERED */
 208 extern int ppc_section_letter (int, char **);
 209 extern int ppc_section_type (char *, size_t);
 210 extern int ppc_section_word (char *, size_t);
 211 extern int ppc_section_flags (int, int, int);
 212
 213 #define md_elf_section_letter(LETTER, PTR_MSG)  ppc_section_letter (LETTER, PTR_MSG)
 214 #define md_elf_section_type(STR, LEN)           ppc_section_type (STR, LEN)
 215 #define md_elf_section_word(STR, LEN)           ppc_section_word (STR, LEN)
 216 #define md_elf_section_flags(FLAGS, ATTR, TYPE) ppc_section_flags (FLAGS, ATTR, TYPE)
 217
 218 #define tc_comment_chars ppc_comment_chars
 219 extern const char *ppc_comment_chars;
 220
 221 /* Keep relocations relative to the GOT, or non-PC relative.  */
 222 #define tc_fix_adjustable(FIX) ppc_fix_adjustable (FIX)
 223 extern int ppc_fix_adjustable (struct fix *);
 224
 225 /* Values passed to md_apply_fix don't include symbol values.  */
 226 #define MD_APPLY_SYM_VALUE(FIX) 0
 227
 228 #define tc_frob_file_before_adjust ppc_frob_file_before_adjust
 229 extern void ppc_frob_file_before_adjust (void);
 230
 231 #endif /* OBJ_ELF */
 232
 233 #if defined (OBJ_ELF) || defined (OBJ_XCOFF)
 234 #define TC_FORCE_RELOCATION(FIX) ppc_force_relocation (FIX)
 235 extern int ppc_force_relocation (struct fix *);
 236 #endif
 237
 238 /* call md_pcrel_from_section, not md_pcrel_from */
 239 #define MD_PCREL_FROM_SECTION(FIX, SEC) md_pcrel_from_section(FIX, SEC)
 240 extern long md_pcrel_from_section (struct fix *, segT);
 241
 242 #define md_parse_name(name, exp, mode, c) ppc_parse_name (name, exp)
 243 extern int ppc_parse_name (const char *, struct expressionS *);
 244
 245 #define md_operand(x)
 246
 247 #define md_cleanup() ppc_cleanup ()
 248 extern void ppc_cleanup (void);
 249
 250 #define TARGET_USE_CFIPOP 1
 251
 252 #define tc_cfi_frame_initial_instructions ppc_cfi_frame_initial_instructions
 253 extern void ppc_cfi_frame_initial_instructions (void);
 254
 255 #define tc_regname_to_dw2regnum tc_ppc_regname_to_dw2regnum
 256 extern int tc_ppc_regname_to_dw2regnum (char *);
 257
 258 extern int ppc_cie_data_alignment;
 259
 260 #define DWARF2_LINE_MIN_INSN_LENGTH     4
 261 #define DWARF2_DEFAULT_RETURN_COLUMN    0x41
 262 #define DWARF2_CIE_DATA_ALIGNMENT       ppc_cie_data_alignment