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 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 \f
  94 #ifdef TE_PE
  95
  96 /* Question marks are permitted in symbol names.  */
  97 #define LEX_QM 1
  98
  99 /* Don't adjust TOC relocs.  */
 100 #define tc_fix_adjustable(FIX) ppc_pe_fix_adjustable (FIX)
 101 extern int ppc_pe_fix_adjustable (struct fix *);
 102
 103 #endif
 104
 105 #ifdef OBJ_XCOFF
 106
 107 /* Declarations needed when generating XCOFF code.  XCOFF is an
 108    extension of COFF, used only on the RS/6000.  Rather than create an
 109    obj-xcoff, we just use obj-coff, and handle the extensions here in
 110    tc-ppc.  */
 111
 112 /* We need to keep some information for symbols.  */
 113 struct ppc_tc_sy
 114 {
 115   /* We keep a few linked lists of symbols.  */
 116   symbolS *next;
 117   /* Non-zero if the symbol should be output.  The RS/6000 assembler
 118      only outputs symbols that are external or are mentioned in a
 119      .globl or .lglobl statement.  */
 120   int output;
 121   /* The symbol class.  */
 122   int class;
 123   /* The real name, if the symbol was renamed.  */
 124   char *real_name;
 125   /* For a csect symbol, the subsegment we are using.  This is zero
 126      for symbols that are not csects.  */
 127   subsegT subseg;
 128   /* For a csect or common symbol, the alignment to use.  */
 129   int align;
 130   /* For a function symbol, a symbol whose value is the size.  The
 131      field is NULL if there is no size.  */
 132   symbolS *size;
 133   /* For a csect symbol, the last symbol which has been defined in
 134      this csect, or NULL if none have been defined so far.  For a .bs
 135      symbol, the referenced csect symbol.  */
 136   symbolS *within;
 137 };
 138
 139 #define TC_SYMFIELD_TYPE struct ppc_tc_sy
 140
 141 /* We need an additional auxent for function symbols.  */
 142 #define OBJ_COFF_MAX_AUXENTRIES 2
 143
 144 /* Square and curly brackets are permitted in symbol names.  */
 145 #define LEX_BR 3
 146
 147 /* Canonicalize the symbol name.  */
 148 #define tc_canonicalize_symbol_name(name) ppc_canonicalize_symbol_name (name)
 149 extern char *ppc_canonicalize_symbol_name (char *);
 150
 151 /* Get the symbol class from the name.  */
 152 #define tc_symbol_new_hook(sym) ppc_symbol_new_hook (sym)
 153 extern void ppc_symbol_new_hook (symbolS *);
 154
 155 /* Set the symbol class of a label based on the csect.  */
 156 #define tc_frob_label(sym) ppc_frob_label (sym)
 157 extern void ppc_frob_label (symbolS *);
 158
 159 /* TOC relocs requires special handling.  */
 160 #define tc_fix_adjustable(FIX) ppc_fix_adjustable (FIX)
 161 extern int ppc_fix_adjustable (struct fix *);
 162
 163 /* We need to set the section VMA.  */
 164 #define tc_frob_section(sec) ppc_frob_section (sec)
 165 extern void ppc_frob_section (asection *);
 166
 167 /* Finish up the symbol.  */
 168 #define tc_frob_symbol(sym, punt) punt = ppc_frob_symbol (sym)
 169 extern int ppc_frob_symbol (symbolS *);
 170
 171 /* Finish up the entire symtab.  */
 172 #define tc_adjust_symtab() ppc_adjust_symtab ()
 173 extern void ppc_adjust_symtab (void);
 174
 175 /* We also need to copy, in particular, the class of the symbol,
 176    over what obj-coff would otherwise have copied.  */
 177 #define OBJ_COPY_SYMBOL_ATTRIBUTES(dest,src)                    \
 178 do {                                                            \
 179   if (SF_GET_GET_SEGMENT (dest))                                \
 180     S_SET_SEGMENT (dest, S_GET_SEGMENT (src));                  \
 181   symbol_get_tc (dest)->size = symbol_get_tc (src)->size;       \
 182   symbol_get_tc (dest)->align = symbol_get_tc (src)->align;     \
 183   symbol_get_tc (dest)->class = symbol_get_tc (src)->class;     \
 184   symbol_get_tc (dest)->within = symbol_get_tc (src)->within;   \
 185 } while (0)
 186
 187 #endif /* OBJ_XCOFF */
 188
 189 extern const char       ppc_symbol_chars[];
 190 #define tc_symbol_chars ppc_symbol_chars
 191
 192 #ifdef OBJ_ELF
 193
 194 /* Support for SHF_EXCLUDE and SHT_ORDERED */
 195 extern int ppc_section_letter (int, char **);
 196 extern int ppc_section_type (char *, size_t);
 197 extern int ppc_section_word (char *, size_t);
 198 extern int ppc_section_flags (int, int, int);
 199
 200 #define md_elf_section_letter(LETTER, PTR_MSG)  ppc_section_letter (LETTER, PTR_MSG)
 201 #define md_elf_section_type(STR, LEN)           ppc_section_type (STR, LEN)
 202 #define md_elf_section_word(STR, LEN)           ppc_section_word (STR, LEN)
 203 #define md_elf_section_flags(FLAGS, ATTR, TYPE) ppc_section_flags (FLAGS, ATTR, TYPE)
 204
 205 #define tc_comment_chars ppc_comment_chars
 206 extern const char *ppc_comment_chars;
 207
 208 /* Keep relocations relative to the GOT, or non-PC relative.  */
 209 #define tc_fix_adjustable(FIX) ppc_fix_adjustable (FIX)
 210 extern int ppc_fix_adjustable (struct fix *);
 211
 212 /* Values passed to md_apply_fix don't include symbol values.  */
 213 #define MD_APPLY_SYM_VALUE(FIX) 0
 214
 215 #define tc_frob_file_before_adjust ppc_frob_file_before_adjust
 216 extern void ppc_frob_file_before_adjust (void);
 217
 218 #endif /* OBJ_ELF */
 219
 220 #if defined (OBJ_ELF) || defined (OBJ_XCOFF)
 221 #define TC_FORCE_RELOCATION(FIX) ppc_force_relocation (FIX)
 222 extern int ppc_force_relocation (struct fix *);
 223 #endif
 224
 225 /* call md_pcrel_from_section, not md_pcrel_from */
 226 #define MD_PCREL_FROM_SECTION(FIX, SEC) md_pcrel_from_section(FIX, SEC)
 227 extern long md_pcrel_from_section (struct fix *, segT);
 228
 229 #define md_parse_name(name, exp, mode, c) ppc_parse_name (name, exp)
 230 extern int ppc_parse_name (const char *, struct expressionS *);
 231
 232 #define md_operand(x)
 233
 234 #define md_cleanup() ppc_cleanup ()
 235 extern void ppc_cleanup (void);
 236
 237 #define TARGET_USE_CFIPOP 1
 238
 239 #define tc_cfi_frame_initial_instructions ppc_cfi_frame_initial_instructions
 240 extern void ppc_cfi_frame_initial_instructions (void);
 241
 242 #define tc_regname_to_dw2regnum tc_ppc_regname_to_dw2regnum
 243 extern int tc_ppc_regname_to_dw2regnum (char *);
 244
 245 extern int ppc_cie_data_alignment;
 246
 247 #define DWARF2_LINE_MIN_INSN_LENGTH     4
 248 #define DWARF2_DEFAULT_RETURN_COLUMN    0x41
 249 #define DWARF2_CIE_DATA_ALIGNMENT       ppc_cie_data_alignment