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 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 2, 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 #ifndef BFD_ASSEMBLER
  33  #error PowerPC support requires BFD_ASSEMBLER
  34 #endif
  35
  36 /* If OBJ_COFF is defined, and TE_PE is not defined, we are assembling
  37    XCOFF for AIX or PowerMac.  If TE_PE is defined, we are assembling
  38    COFF for Windows NT.  */
  39
  40 #ifdef OBJ_COFF
  41 #ifndef TE_PE
  42 #define OBJ_XCOFF
  43 #endif
  44 #endif
  45
  46 /* The target BFD architecture.  */
  47 #define TARGET_ARCH (ppc_arch ())
  48 #define TARGET_MACH (ppc_mach ())
  49 extern enum bfd_architecture ppc_arch PARAMS ((void));
  50 extern unsigned long ppc_mach PARAMS ((void));
  51
  52 /* Whether or not the target is big endian */
  53 extern int target_big_endian;
  54
  55 /* The target BFD format.  */
  56 #define TARGET_FORMAT (ppc_target_format ())
  57 extern char *ppc_target_format PARAMS ((void));
  58
  59 /* Permit temporary numeric labels.  */
  60 #define LOCAL_LABELS_FB 1
  61
  62 /* $ is used to refer to the current location.  */
  63 #define DOLLAR_DOT
  64
  65 /* Strings do not use backslash escapes under COFF.  */
  66 #ifdef OBJ_COFF
  67 #define NO_STRING_ESCAPES
  68 #endif
  69
  70 #ifdef OBJ_ELF
  71 #define DIFF_EXPR_OK            /* foo-. gets turned into PC relative relocs */
  72 #endif
  73
  74 #if TARGET_BYTES_BIG_ENDIAN
  75 #define PPC_BIG_ENDIAN 1
  76 #else
  77 #define PPC_BIG_ENDIAN 0
  78 #endif
  79
  80 /* We don't need to handle .word strangely.  */
  81 #define WORKING_DOT_WORD
  82
  83 #define MAX_MEM_FOR_RS_ALIGN_CODE 4
  84 #define HANDLE_ALIGN(FRAGP)                                             \
  85   if ((FRAGP)->fr_type == rs_align_code)                                \
  86     {                                                                   \
  87       valueT count = ((FRAGP)->fr_next->fr_address                      \
  88                       - ((FRAGP)->fr_address + (FRAGP)->fr_fix));       \
  89       if (count != 0 && (count & 3) == 0)                               \
  90         {                                                               \
  91           char *dest = (FRAGP)->fr_literal + (FRAGP)->fr_fix;           \
  92                                                                         \
  93           (FRAGP)->fr_var = 4;                                          \
  94           if (target_big_endian)                                        \
  95             {                                                           \
  96               *dest++ = 0x60;                                           \
  97               *dest++ = 0;                                              \
  98               *dest++ = 0;                                              \
  99               *dest++ = 0;                                              \
 100             }                                                           \
 101           else                                                          \
 102             {                                                           \
 103               *dest++ = 0;                                              \
 104               *dest++ = 0;                                              \
 105               *dest++ = 0;                                              \
 106               *dest++ = 0x60;                                           \
 107             }                                                           \
 108         }                                                               \
 109     }
 110
 111 #define md_frag_check(FRAGP) \
 112   if ((FRAGP)->has_code                                                 \
 113       && (((FRAGP)->fr_address + (FRAGP)->insn_addr) & 3) != 0)         \
 114     as_bad_where ((FRAGP)->fr_file, (FRAGP)->fr_line,                   \
 115                   _("instruction address is not a multiple of 4"));
 116 \f
 117 #ifdef TE_PE
 118
 119 /* Question marks are permitted in symbol names.  */
 120 #define LEX_QM 1
 121
 122 /* Don't adjust TOC relocs.  */
 123 #define tc_fix_adjustable(FIX) ppc_pe_fix_adjustable (FIX)
 124 extern int ppc_pe_fix_adjustable PARAMS ((struct fix *));
 125
 126 #endif
 127
 128 #ifdef OBJ_XCOFF
 129
 130 /* Declarations needed when generating XCOFF code.  XCOFF is an
 131    extension of COFF, used only on the RS/6000.  Rather than create an
 132    obj-xcoff, we just use obj-coff, and handle the extensions here in
 133    tc-ppc.  */
 134
 135 /* We need to keep some information for symbols.  */
 136 struct ppc_tc_sy
 137 {
 138   /* We keep a few linked lists of symbols.  */
 139   symbolS *next;
 140   /* Non-zero if the symbol should be output.  The RS/6000 assembler
 141      only outputs symbols that are external or are mentioned in a
 142      .globl or .lglobl statement.  */
 143   int output;
 144   /* The symbol class.  */
 145   int class;
 146   /* The real name, if the symbol was renamed.  */
 147   char *real_name;
 148   /* For a csect symbol, the subsegment we are using.  This is zero
 149      for symbols that are not csects.  */
 150   subsegT subseg;
 151   /* For a csect or common symbol, the alignment to use.  */
 152   int align;
 153   /* For a function symbol, a symbol whose value is the size.  The
 154      field is NULL if there is no size.  */
 155   symbolS *size;
 156   /* For a csect symbol, the last symbol which has been defined in
 157      this csect, or NULL if none have been defined so far.  For a .bs
 158      symbol, the referenced csect symbol.  */
 159   symbolS *within;
 160 };
 161
 162 #define TC_SYMFIELD_TYPE struct ppc_tc_sy
 163
 164 /* We need an additional auxent for function symbols.  */
 165 #define OBJ_COFF_MAX_AUXENTRIES 2
 166
 167 /* Square and curly brackets are permitted in symbol names.  */
 168 #define LEX_BR 3
 169
 170 /* Canonicalize the symbol name.  */
 171 #define tc_canonicalize_symbol_name(name) ppc_canonicalize_symbol_name (name)
 172 extern char *ppc_canonicalize_symbol_name PARAMS ((char *));
 173
 174 /* Get the symbol class from the name.  */
 175 #define tc_symbol_new_hook(sym) ppc_symbol_new_hook (sym)
 176 extern void ppc_symbol_new_hook PARAMS ((symbolS *));
 177
 178 /* Set the symbol class of a label based on the csect.  */
 179 #define tc_frob_label(sym) ppc_frob_label (sym)
 180 extern void ppc_frob_label PARAMS ((symbolS *));
 181
 182 /* TOC relocs requires special handling.  */
 183 #define tc_fix_adjustable(FIX) ppc_fix_adjustable (FIX)
 184 extern int ppc_fix_adjustable PARAMS ((struct fix *));
 185
 186 /* We need to set the section VMA.  */
 187 #define tc_frob_section(sec) ppc_frob_section (sec)
 188 extern void ppc_frob_section PARAMS ((asection *));
 189
 190 /* Finish up the symbol.  */
 191 #define tc_frob_symbol(sym, punt) punt = ppc_frob_symbol (sym)
 192 extern int ppc_frob_symbol PARAMS ((symbolS *));
 193
 194 /* Finish up the entire symtab.  */
 195 #define tc_adjust_symtab() ppc_adjust_symtab ()
 196 extern void ppc_adjust_symtab PARAMS ((void));
 197
 198 /* We also need to copy, in particular, the class of the symbol,
 199    over what obj-coff would otherwise have copied.  */
 200 #define OBJ_COPY_SYMBOL_ATTRIBUTES(dest,src)                    \
 201 do {                                                            \
 202   if (SF_GET_GET_SEGMENT (dest))                                \
 203     S_SET_SEGMENT (dest, S_GET_SEGMENT (src));                  \
 204   symbol_get_tc (dest)->size = symbol_get_tc (src)->size;       \
 205   symbol_get_tc (dest)->align = symbol_get_tc (src)->align;     \
 206   symbol_get_tc (dest)->class = symbol_get_tc (src)->class;     \
 207   symbol_get_tc (dest)->within = symbol_get_tc (src)->within;   \
 208 } while (0)
 209
 210 #endif /* OBJ_XCOFF */
 211
 212 extern const char       ppc_symbol_chars[];
 213 #define tc_symbol_chars ppc_symbol_chars
 214
 215 #ifdef OBJ_ELF
 216
 217 /* Support for SHF_EXCLUDE and SHT_ORDERED */
 218 extern int ppc_section_letter PARAMS ((int, char **));
 219 extern int ppc_section_type PARAMS ((char *, size_t));
 220 extern int ppc_section_word PARAMS ((char *, size_t));
 221 extern int ppc_section_flags PARAMS ((int, int, int));
 222
 223 #define md_elf_section_letter(LETTER, PTR_MSG)  ppc_section_letter (LETTER, PTR_MSG)
 224 #define md_elf_section_type(STR, LEN)           ppc_section_type (STR, LEN)
 225 #define md_elf_section_word(STR, LEN)           ppc_section_word (STR, LEN)
 226 #define md_elf_section_flags(FLAGS, ATTR, TYPE) ppc_section_flags (FLAGS, ATTR, TYPE)
 227
 228 #define tc_comment_chars ppc_comment_chars
 229 extern const char *ppc_comment_chars;
 230
 231 /* Keep relocations relative to the GOT, or non-PC relative.  */
 232 #define tc_fix_adjustable(FIX) ppc_fix_adjustable (FIX)
 233 extern int ppc_fix_adjustable PARAMS ((struct fix *));
 234
 235 /* Values passed to md_apply_fix don't include symbol values.  */
 236 #define MD_APPLY_SYM_VALUE(FIX) 0
 237
 238 #define tc_frob_file_before_adjust ppc_frob_file_before_adjust
 239 extern void ppc_frob_file_before_adjust PARAMS ((void));
 240
 241 #endif /* OBJ_ELF */
 242
 243 #if defined (OBJ_ELF) || defined (OBJ_XCOFF)
 244 #define TC_FORCE_RELOCATION(FIX) ppc_force_relocation (FIX)
 245 extern int ppc_force_relocation PARAMS ((struct fix *));
 246 #endif
 247
 248 /* call md_pcrel_from_section, not md_pcrel_from */
 249 #define MD_PCREL_FROM_SECTION(FIX, SEC) md_pcrel_from_section(FIX, SEC)
 250 extern long md_pcrel_from_section PARAMS ((struct fix *, segT));
 251
 252 #define md_parse_name(name, exp, c) ppc_parse_name (name, exp)
 253 extern int ppc_parse_name PARAMS ((const char *, struct expressionS *));
 254
 255 #define md_operand(x)
 256
 257 #define md_cleanup() ppc_cleanup ()
 258  extern void ppc_cleanup PARAMS ((void));
 259
 260 #define TARGET_USE_CFIPOP 1
 261
 262 #define tc_cfi_frame_initial_instructions ppc_cfi_frame_initial_instructions
 263 extern void ppc_cfi_frame_initial_instructions PARAMS ((void));
 264
 265 #define tc_regname_to_dw2regnum tc_ppc_regname_to_dw2regnum
 266 extern int tc_ppc_regname_to_dw2regnum PARAMS ((const char *regname));
 267
 268 extern int ppc_cie_data_alignment;
 269
 270 #define DWARF2_LINE_MIN_INSN_LENGTH     4
 271 #define DWARF2_DEFAULT_RETURN_COLUMN    0x41
 272 #define DWARF2_CIE_DATA_ALIGNMENT       ppc_cie_data_alignment