gas/write.h

   1 /* write.h
   2    Copyright 1987, 1992, 1993, 1994, 1995, 1996, 1997, 1999, 2000, 2001,
   3    2002, 2003, 2005, 2006, 2007
   4    Free Software Foundation, Inc.
   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 #ifndef __write_h__
  24 #define __write_h__
  25
  26 /* This is the name of a fake symbol which will never appear in the
  27    assembler output.  S_IS_LOCAL detects it because of the \001.  */
  28 #ifndef FAKE_LABEL_NAME
  29 #define FAKE_LABEL_NAME "L0\001"
  30 #endif
  31
  32 #include "bit_fix.h"
  33
  34 /*
  35  * FixSs may be built up in any order.
  36  */
  37
  38 struct fix
  39 {
  40   /* These small fields are grouped together for compactness of
  41      this structure, and efficiency of access on some architectures.  */
  42
  43   /* Is this a pc-relative relocation?  */
  44   unsigned fx_pcrel : 1;
  45
  46   /* Is this value an immediate displacement?  */
  47   /* Only used on ns32k; merge it into TC_FIX_TYPE sometime.  */
  48   unsigned fx_im_disp : 2;
  49
  50   /* Some bits for the CPU specific code.  */
  51   unsigned fx_tcbit : 1;
  52   unsigned fx_tcbit2 : 1;
  53
  54   /* Has this relocation already been applied?  */
  55   unsigned fx_done : 1;
  56
  57   /* Suppress overflow complaints on large addends.  This is used
  58      in the PowerPC ELF config to allow large addends on the
  59      BFD_RELOC_{LO16,HI16,HI16_S} relocations.
  60
  61      @@ Can this be determined from BFD?  */
  62   unsigned fx_no_overflow : 1;
  63
  64   /* The value is signed when checking for overflow.  */
  65   unsigned fx_signed : 1;
  66
  67   /* pc-relative offset adjust (only used by m68k and m68hc11) */
  68   char fx_pcrel_adjust;
  69
  70   /* How many bytes are involved? */
  71   unsigned char fx_size;
  72
  73   /* Which frag does this fix apply to?  */
  74   fragS *fx_frag;
  75
  76   /* Where is the first byte to fix up?  */
  77   long fx_where;
  78
  79   /* NULL or Symbol whose value we add in.  */
  80   symbolS *fx_addsy;
  81
  82   /* NULL or Symbol whose value we subtract.  */
  83   symbolS *fx_subsy;
  84
  85   /* Absolute number we add in.  */
  86   valueT fx_offset;
  87
  88   /* The value of dot when the fixup expression was parsed.  */
  89   addressT fx_dot_value;
  90
  91   /* Next fixS in linked list, or NULL.  */
  92   struct fix *fx_next;
  93
  94   /* If NULL, no bitfix's to do.  */
  95   /* Only i960-coff and ns32k use this, and i960-coff stores an
  96      integer.  This can probably be folded into tc_fix_data, below.
  97      @@ Alpha also uses it, but only to disable certain relocation
  98      processing.  */
  99   bit_fixS *fx_bit_fixP;
 100
 101   bfd_reloc_code_real_type fx_r_type;
 102
 103   /* This field is sort of misnamed.  It appears to be a sort of random
 104      scratch field, for use by the back ends.  The main gas code doesn't
 105      do anything but initialize it to zero.  The use of it does need to
 106      be coordinated between the cpu and format files, though.  E.g., some
 107      coff targets pass the `addend' field from the cpu file via this
 108      field.  I don't know why the `fx_offset' field above can't be used
 109      for that; investigate later and document. KR  */
 110   valueT fx_addnumber;
 111
 112   /* The location of the instruction which created the reloc, used
 113      in error messages.  */
 114   char *fx_file;
 115   unsigned fx_line;
 116
 117 #ifdef USING_CGEN
 118   struct {
 119     /* CGEN_INSN entry for this instruction.  */
 120     const struct cgen_insn *insn;
 121     /* Target specific data, usually reloc number.  */
 122     int opinfo;
 123     /* Which ifield this fixup applies to. */
 124     struct cgen_maybe_multi_ifield * field;
 125     /* is this field is the MSB field in a set? */
 126     int msb_field_p;
 127   } fx_cgen;
 128 #endif
 129
 130 #ifdef TC_FIX_TYPE
 131   /* Location where a backend can attach additional data
 132      needed to perform fixups.  */
 133   TC_FIX_TYPE tc_fix_data;
 134 #endif
 135 };
 136
 137 typedef struct fix fixS;
 138
 139 struct reloc_list
 140 {
 141   struct reloc_list *next;
 142   union
 143   {
 144     struct
 145     {
 146       symbolS *offset_sym;
 147       reloc_howto_type *howto;
 148       symbolS *sym;
 149       bfd_vma addend;
 150     } a;
 151     struct
 152     {
 153       asection *sec;
 154       asymbol *s;
 155       arelent r;
 156     } b;
 157   } u;
 158   char *file;
 159   unsigned int line;
 160 };
 161
 162 extern int finalize_syms;
 163 extern symbolS *abs_section_sym;
 164 extern addressT dot_value;
 165 extern struct reloc_list* reloc_list;
 166
 167 extern void append (char **charPP, char *fromP, unsigned long length);
 168 extern void record_alignment (segT seg, int align);
 169 extern int get_recorded_alignment (segT seg);
 170 extern void subsegs_finish (void);
 171 extern void write_object_file (void);
 172 extern long relax_frag (segT, fragS *, long);
 173 extern int relax_segment (struct frag *, segT, int);
 174 extern void number_to_chars_littleendian (char *, valueT, int);
 175 extern void number_to_chars_bigendian (char *, valueT, int);
 176 extern fixS *fix_new
 177   (fragS * frag, int where, int size, symbolS * add_symbol,
 178    offsetT offset, int pcrel, bfd_reloc_code_real_type r_type);
 179 extern fixS *fix_at_start
 180   (fragS * frag, int size, symbolS * add_symbol,
 181    offsetT offset, int pcrel, bfd_reloc_code_real_type r_type);
 182 extern fixS *fix_new_exp
 183   (fragS * frag, int where, int size, expressionS *exp, int pcrel,
 184    bfd_reloc_code_real_type r_type);
 185 extern void write_print_statistics (FILE *);
 186
 187 #endif /* __write_h__ */