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, 2009 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 #include "opcode/ppc.h"
  26
  27 struct fix;
  28
  29 /* Set the endianness we are using.  Default to big endian.  */
  30 #ifndef TARGET_BYTES_BIG_ENDIAN
  31 #define TARGET_BYTES_BIG_ENDIAN 1
  32 #endif
  33
  34 /* If OBJ_COFF is defined, and TE_PE is not defined, we are assembling
  35    XCOFF for AIX or PowerMac.  If TE_PE is defined, we are assembling
  36    COFF for Windows NT.  */
  37
  38 #ifdef OBJ_COFF
  39 #ifndef TE_PE
  40 #define OBJ_XCOFF
  41 #endif
  42 #endif
  43
  44 /* The target BFD architecture.  */
  45 #define TARGET_ARCH (ppc_arch ())
  46 #define TARGET_MACH (ppc_mach ())
  47 extern enum bfd_architecture ppc_arch (void);
  48 extern unsigned long ppc_mach (void);
  49
  50 /* Whether or not the target is big endian */
  51 extern int target_big_endian;
  52
  53 /* The target BFD format.  */
  54 #define TARGET_FORMAT (ppc_target_format ())
  55 extern char *ppc_target_format (void);
  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 #ifdef OBJ_ELF
  69 #define DIFF_EXPR_OK            /* foo-. gets turned into PC relative relocs */
  70 #endif
  71
  72 #if TARGET_BYTES_BIG_ENDIAN
  73 #define PPC_BIG_ENDIAN 1
  74 #else
  75 #define PPC_BIG_ENDIAN 0
  76 #endif
  77
  78 /* We don't need to handle .word strangely.  */
  79 #define WORKING_DOT_WORD
  80
  81 #define MAX_MEM_FOR_RS_ALIGN_CODE 4
  82 #define HANDLE_ALIGN(FRAGP)                                             \
  83   if ((FRAGP)->fr_type == rs_align_code)                                \
  84     ppc_handle_align (FRAGP);
  85
  86 extern void ppc_handle_align (struct frag *);
  87
  88 #define SUB_SEGMENT_ALIGN(SEG, FRCHAIN) 0
  89
  90 #define md_frag_check(FRAGP) \
  91   if ((FRAGP)->has_code                                                 \
  92       && (((FRAGP)->fr_address + (FRAGP)->insn_addr) & 3) != 0)         \
  93     as_bad_where ((FRAGP)->fr_file, (FRAGP)->fr_line,                   \
  94                   _("instruction address is not a multiple of 4"));
  95
  96 /* Arrange to store the value of ppc_cpu at the site of a fixup
  97    for later use in md_apply_fix.  */
  98 struct _ppc_fix_extra
  99 {
 100   ppc_cpu_t ppc_cpu;
 101 };
 102
 103 extern ppc_cpu_t ppc_cpu;
 104
 105 #define TC_FIX_TYPE struct _ppc_fix_extra
 106 #define TC_INIT_FIX_DATA(FIXP) \
 107   do { (FIXP)->tc_fix_data.ppc_cpu = ppc_cpu; } while (0)
 108 \f
 109 #ifdef TE_PE
 110
 111 /* Question marks are permitted in symbol names.  */
 112 #define LEX_QM 1
 113
 114 /* Don't adjust TOC relocs.  */
 115 #define tc_fix_adjustable(FIX) ppc_pe_fix_adjustable (FIX)
 116 extern int ppc_pe_fix_adjustable (struct fix *);
 117
 118 #endif
 119
 120 #ifdef OBJ_XCOFF
 121
 122 /* Declarations needed when generating XCOFF code.  XCOFF is an
 123    extension of COFF, used only on the RS/6000.  Rather than create an
 124    obj-xcoff, we just use obj-coff, and handle the extensions here in
 125    tc-ppc.  */
 126
 127 /* We need to keep some information for symbols.  */
 128 struct ppc_tc_sy
 129 {
 130   /* We keep a few linked lists of symbols.  */
 131   symbolS *next;
 132   /* The real name, if the symbol was renamed.  */
 133   char *real_name;
 134   /* Non-zero if the symbol should be output.  The RS/6000 assembler
 135      only outputs symbols that are external or are mentioned in a
 136      .globl or .lglobl statement.  */
 137   unsigned char output;
 138   /* The symbol class.  */
 139   short symbol_class;
 140   /* For a csect or common symbol, the alignment to use.  */
 141   unsigned char align;
 142   /* For a csect symbol, the subsegment we are using.  This is zero
 143      for symbols that are not csects.  */
 144   subsegT subseg;
 145   /* For a csect symbol, the last symbol which has been defined in
 146      this csect, or NULL if none have been defined so far.  For a .bs
 147      symbol, the referenced csect symbol.  */
 148   symbolS *within;
 149   union
 150   {
 151     /* For a function symbol, a symbol whose value is the size.  The
 152        field is NULL if there is no size.  */
 153     symbolS *size;
 154     /* For a dwarf symbol, the corresponding dwarf subsection.  */
 155     struct dw_subsection *dw;
 156   } u;
 157 };
 158
 159 #define TC_SYMFIELD_TYPE struct ppc_tc_sy
 160
 161 /* We need an additional auxent for function symbols.  */
 162 #define OBJ_COFF_MAX_AUXENTRIES 2
 163
 164 /* Square and curly brackets are permitted in symbol names.  */
 165 #define LEX_BR 3
 166
 167 /* Canonicalize the symbol name.  */
 168 #define tc_canonicalize_symbol_name(name) ppc_canonicalize_symbol_name (name)
 169 extern char *ppc_canonicalize_symbol_name (char *);
 170
 171 /* Get the symbol class from the name.  */
 172 #define tc_symbol_new_hook(sym) ppc_symbol_new_hook (sym)
 173 extern void ppc_symbol_new_hook (symbolS *);
 174
 175 /* Set the symbol class of a label based on the csect.  */
 176 #define tc_frob_label(sym) ppc_frob_label (sym)
 177 extern void ppc_frob_label (symbolS *);
 178
 179 /* TOC relocs requires special handling.  */
 180 #define tc_fix_adjustable(FIX) ppc_fix_adjustable (FIX)
 181 extern int ppc_fix_adjustable (struct fix *);
 182
 183 /* We need to set the section VMA.  */
 184 #define tc_frob_section(sec) ppc_frob_section (sec)
 185 extern void ppc_frob_section (asection *);
 186
 187 /* Finish up the symbol.  */
 188 #define tc_frob_symbol(sym, punt) punt = ppc_frob_symbol (sym)
 189 extern int ppc_frob_symbol (symbolS *);
 190
 191 /* Finish up the entire symtab.  */
 192 #define tc_adjust_symtab() ppc_adjust_symtab ()
 193 extern void ppc_adjust_symtab (void);
 194
 195 /* We also need to copy, in particular, the class of the symbol,
 196    over what obj-coff would otherwise have copied.  */
 197 #define OBJ_COPY_SYMBOL_ATTRIBUTES(dest,src)                    \
 198 do {                                                            \
 199   if (SF_GET_GET_SEGMENT (dest))                                \
 200     S_SET_SEGMENT (dest, S_GET_SEGMENT (src));                  \
 201   symbol_get_tc (dest)->u = symbol_get_tc (src)->u;             \
 202   symbol_get_tc (dest)->align = symbol_get_tc (src)->align;     \
 203   symbol_get_tc (dest)->symbol_class = symbol_get_tc (src)->symbol_class;       \
 204   symbol_get_tc (dest)->within = symbol_get_tc (src)->within;   \
 205 } while (0)
 206
 207 extern void ppc_xcoff_end (void);
 208 #define md_end ppc_xcoff_end
 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 SHT_ORDERED */
 218 extern int ppc_section_type (char *, size_t);
 219 extern int ppc_section_flags (flagword, bfd_vma, int);
 220
 221 #define md_elf_section_type(STR, LEN)           ppc_section_type (STR, LEN)
 222 #define md_elf_section_flags(FLAGS, ATTR, TYPE) ppc_section_flags (FLAGS, ATTR, TYPE)
 223
 224 #define tc_comment_chars ppc_comment_chars
 225 extern const char *ppc_comment_chars;
 226
 227 /* Keep relocations relative to the GOT, or non-PC relative.  */
 228 #define tc_fix_adjustable(FIX) ppc_fix_adjustable (FIX)
 229 extern int ppc_fix_adjustable (struct fix *);
 230
 231 /* Values passed to md_apply_fix don't include symbol values.  */
 232 #define MD_APPLY_SYM_VALUE(FIX) 0
 233
 234 #define tc_frob_file_before_adjust ppc_frob_file_before_adjust
 235 extern void ppc_frob_file_before_adjust (void);
 236
 237 #endif /* OBJ_ELF */
 238
 239 #if defined (OBJ_ELF) || defined (OBJ_XCOFF)
 240 #define TC_FORCE_RELOCATION(FIX) ppc_force_relocation (FIX)
 241 extern int ppc_force_relocation (struct fix *);
 242 #endif
 243
 244 /* call md_pcrel_from_section, not md_pcrel_from */
 245 #define MD_PCREL_FROM_SECTION(FIX, SEC) md_pcrel_from_section(FIX, SEC)
 246 extern long md_pcrel_from_section (struct fix *, segT);
 247
 248 #define md_parse_name(name, exp, mode, c) ppc_parse_name (name, exp)
 249 extern int ppc_parse_name (const char *, struct expressionS *);
 250
 251 #define md_operand(x)
 252
 253 #define md_cleanup() ppc_cleanup ()
 254 extern void ppc_cleanup (void);
 255
 256 /* ppc uses different register numbers between .eh_frame and .debug_frame.
 257    This macro translates the .eh_frame register numbers to .debug_frame
 258    register numbers.  */
 259 #define md_reg_eh_frame_to_debug_frame(regno) \
 260   ((regno) == 70 ? 64 /* cr2 */ : (regno))
 261
 262 #define TARGET_USE_CFIPOP 1
 263
 264 #define tc_cfi_frame_initial_instructions ppc_cfi_frame_initial_instructions
 265 extern void ppc_cfi_frame_initial_instructions (void);
 266
 267 #define tc_regname_to_dw2regnum tc_ppc_regname_to_dw2regnum
 268 extern int tc_ppc_regname_to_dw2regnum (char *);
 269
 270 extern int ppc_cie_data_alignment;
 271
 272 #define DWARF2_LINE_MIN_INSN_LENGTH     4
 273 #define DWARF2_DEFAULT_RETURN_COLUMN    0x41
 274 #define DWARF2_CIE_DATA_ALIGNMENT       ppc_cie_data_alignment