gas/write.h

   1 /* write.h
   2    Copyright 1987, 1992, 1993, 1994, 1995, 1996, 1997, 1999, 2000, 2001,
   3    2002, 2003 Free Software Foundation, Inc.
   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, 51 Franklin Street - Fifth Floor, Boston, MA
  20    02110-1301, USA.  */
  21
  22 #ifndef __write_h__
  23 #define __write_h__
  24
  25 #ifndef TC_I960
  26 #ifdef hpux
  27 #define EXEC_MACHINE_TYPE HP9000S200_ID
  28 #endif
  29 #endif /* TC_I960 */
  30
  31 #ifndef BFD_ASSEMBLER
  32
  33 #ifndef LOCAL_LABEL
  34 #define LOCAL_LABEL(name) (name [0] == 'L' )
  35 #endif
  36
  37 #define S_LOCAL_NAME(s) (LOCAL_LABEL (S_GET_NAME (s)))
  38
  39 #endif /* ! BFD_ASSEMBLER */
  40
  41 /* This is the name of a fake symbol which will never appear in the
  42    assembler output.  S_IS_LOCAL detects it because of the \001.  */
  43 #ifndef FAKE_LABEL_NAME
  44 #define FAKE_LABEL_NAME "L0\001"
  45 #endif
  46
  47 #include "bit_fix.h"
  48
  49 /*
  50  * FixSs may be built up in any order.
  51  */
  52
  53 struct fix
  54 {
  55   /* These small fields are grouped together for compactness of
  56      this structure, and efficiency of access on some architectures.  */
  57
  58   /* pc-relative offset adjust (only used by m68k) */
  59   char fx_pcrel_adjust;
  60
  61   /* How many bytes are involved? */
  62   unsigned char fx_size;
  63
  64   /* Is this a pc-relative relocation?  */
  65   unsigned fx_pcrel : 1;
  66
  67   /* Is this a relocation to a procedure linkage table entry?  If so,
  68      some of the reductions we try to apply are invalid.  A better way
  69      might be to represent PLT entries with different kinds of
  70      symbols, and use normal relocations (with undefined symbols);
  71      look into it for version 2.6.  */
  72   unsigned fx_plt : 1;
  73
  74   /* Is this value an immediate displacement?  */
  75   /* Only used on i960 and ns32k; merge it into TC_FIX_TYPE sometime.  */
  76   unsigned fx_im_disp : 2;
  77
  78   /* A bit for the CPU specific code.
  79      This probably can be folded into tc_fix_data, below.  */
  80   unsigned fx_tcbit : 1;
  81
  82   /* Has this relocation already been applied?  */
  83   unsigned fx_done : 1;
  84
  85   /* Suppress overflow complaints on large addends.  This is used
  86      in the PowerPC ELF config to allow large addends on the
  87      BFD_RELOC_{LO16,HI16,HI16_S} relocations.
  88
  89      @@ Can this be determined from BFD?  */
  90   unsigned fx_no_overflow : 1;
  91
  92   /* The value is signed when checking for overflow.  */
  93   unsigned fx_signed : 1;
  94
  95   /* Which frag does this fix apply to?  */
  96   fragS *fx_frag;
  97
  98   /* Where is the first byte to fix up?  */
  99   long fx_where;
 100
 101   /* NULL or Symbol whose value we add in.  */
 102   symbolS *fx_addsy;
 103
 104   /* NULL or Symbol whose value we subtract.  */
 105   symbolS *fx_subsy;
 106
 107   /* Absolute number we add in.  */
 108   valueT fx_offset;
 109
 110   /* The value of dot when the fixup expression was parsed.  */
 111   addressT fx_dot_value;
 112
 113   /* Next fixS in linked list, or NULL.  */
 114   struct fix *fx_next;
 115
 116   /* If NULL, no bitfix's to do.  */
 117   /* Only i960-coff and ns32k use this, and i960-coff stores an
 118      integer.  This can probably be folded into tc_fix_data, below.
 119      @@ Alpha also uses it, but only to disable certain relocation
 120      processing.  */
 121   bit_fixS *fx_bit_fixP;
 122
 123 #ifdef BFD_ASSEMBLER
 124   bfd_reloc_code_real_type fx_r_type;
 125 #else
 126 #ifdef NEED_FX_R_TYPE
 127   /* Hack for machines where the type of reloc can't be
 128      worked out by looking at how big it is.  */
 129   int fx_r_type;
 130 #endif
 131 #endif
 132
 133   /* This field is sort of misnamed.  It appears to be a sort of random
 134      scratch field, for use by the back ends.  The main gas code doesn't
 135      do anything but initialize it to zero.  The use of it does need to
 136      be coordinated between the cpu and format files, though.  E.g., some
 137      coff targets pass the `addend' field from the cpu file via this
 138      field.  I don't know why the `fx_offset' field above can't be used
 139      for that; investigate later and document. KR  */
 140   valueT fx_addnumber;
 141
 142   /* The location of the instruction which created the reloc, used
 143      in error messages.  */
 144   char *fx_file;
 145   unsigned fx_line;
 146
 147 #ifdef USING_CGEN
 148   struct {
 149     /* CGEN_INSN entry for this instruction.  */
 150     const struct cgen_insn *insn;
 151     /* Target specific data, usually reloc number.  */
 152     int opinfo;
 153   } fx_cgen;
 154 #endif
 155
 156 #ifdef TC_FIX_TYPE
 157   /* Location where a backend can attach additional data
 158      needed to perform fixups.  */
 159   TC_FIX_TYPE tc_fix_data;
 160 #endif
 161 };
 162
 163 typedef struct fix fixS;
 164
 165 extern int finalize_syms;
 166 extern symbolS *abs_section_sym;
 167 extern addressT dot_value;
 168
 169 #ifndef BFD_ASSEMBLER
 170 extern char *next_object_file_charP;
 171
 172 #ifndef MANY_SEGMENTS
 173 COMMON fixS *text_fix_root, *text_fix_tail;     /* Chains fixSs.  */
 174 COMMON fixS *data_fix_root, *data_fix_tail;     /* Chains fixSs.  */
 175 COMMON fixS *bss_fix_root, *bss_fix_tail;       /* Chains fixSs.  */
 176 extern struct frag *text_last_frag;             /* Last frag in segment.  */
 177 extern struct frag *data_last_frag;             /* Last frag in segment.  */
 178 #endif
 179 COMMON fixS **seg_fix_rootP, **seg_fix_tailP;   /* -> one of above.  */
 180 #endif
 181
 182 extern long string_byte_count;
 183 extern int section_alignment[];
 184
 185 extern void append (char **charPP, char *fromP, unsigned long length);
 186 extern void record_alignment (segT seg, int align);
 187 extern int get_recorded_alignment (segT seg);
 188 extern void subsegs_finish (void);
 189 extern void write_object_file (void);
 190 extern long relax_frag (segT, fragS *, long);
 191 extern int relax_segment (struct frag * seg_frag_root, segT seg_type);
 192
 193 extern void number_to_chars_littleendian (char *, valueT, int);
 194 extern void number_to_chars_bigendian (char *, valueT, int);
 195
 196 #ifdef BFD_ASSEMBLER
 197 extern fixS *fix_new
 198   (fragS * frag, int where, int size, symbolS * add_symbol,
 199    offsetT offset, int pcrel, bfd_reloc_code_real_type r_type);
 200 extern fixS *fix_new_exp
 201   (fragS * frag, int where, int size, expressionS *exp, int pcrel,
 202    bfd_reloc_code_real_type r_type);
 203 #else
 204 extern fixS *fix_new
 205   (fragS * frag, int where, int size, symbolS * add_symbol,
 206    offsetT offset, int pcrel, int r_type);
 207 extern fixS *fix_new_exp
 208   (fragS * frag, int where, int size, expressionS *exp, int pcrel,
 209    int r_type);
 210 #endif
 211
 212 extern void write_print_statistics (FILE *);
 213
 214 #endif /* __write_h__ */