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 some CPU specific code) */
  68   signed 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   /* The frag fx_dot_value is based on.  */
  92   fragS *fx_dot_frag;
  93
  94   /* Next fixS in linked list, or NULL.  */
  95   struct fix *fx_next;
  96
  97   /* If NULL, no bitfix's to do.  */
  98   /* Only i960-coff and ns32k use this, and i960-coff stores an
  99      integer.  This can probably be folded into tc_fix_data, below.
 100      @@ Alpha also uses it, but only to disable certain relocation
 101      processing.  */
 102   bit_fixS *fx_bit_fixP;
 103
 104   bfd_reloc_code_real_type fx_r_type;
 105
 106   /* This field is sort of misnamed.  It appears to be a sort of random
 107      scratch field, for use by the back ends.  The main gas code doesn't
 108      do anything but initialize it to zero.  The use of it does need to
 109      be coordinated between the cpu and format files, though.  E.g., some
 110      coff targets pass the `addend' field from the cpu file via this
 111      field.  I don't know why the `fx_offset' field above can't be used
 112      for that; investigate later and document. KR  */
 113   valueT fx_addnumber;
 114
 115   /* The location of the instruction which created the reloc, used
 116      in error messages.  */
 117   char *fx_file;
 118   unsigned fx_line;
 119
 120 #ifdef USING_CGEN
 121   struct {
 122     /* CGEN_INSN entry for this instruction.  */
 123     const struct cgen_insn *insn;
 124     /* Target specific data, usually reloc number.  */
 125     int opinfo;
 126     /* Which ifield this fixup applies to. */
 127     struct cgen_maybe_multi_ifield * field;
 128     /* is this field is the MSB field in a set? */
 129     int msb_field_p;
 130   } fx_cgen;
 131 #endif
 132
 133 #ifdef TC_FIX_TYPE
 134   /* Location where a backend can attach additional data
 135      needed to perform fixups.  */
 136   TC_FIX_TYPE tc_fix_data;
 137 #endif
 138 };
 139
 140 typedef struct fix fixS;
 141
 142 struct reloc_list
 143 {
 144   struct reloc_list *next;
 145   union
 146   {
 147     struct
 148     {
 149       symbolS *offset_sym;
 150       reloc_howto_type *howto;
 151       symbolS *sym;
 152       bfd_vma addend;
 153     } a;
 154     struct
 155     {
 156       asection *sec;
 157       asymbol *s;
 158       arelent r;
 159     } b;
 160   } u;
 161   char *file;
 162   unsigned int line;
 163 };
 164
 165 extern int finalize_syms;
 166 extern symbolS *abs_section_sym;
 167 extern addressT dot_value;
 168 extern fragS *dot_frag;
 169 extern struct reloc_list* reloc_list;
 170
 171 extern void append (char **charPP, char *fromP, unsigned long length);
 172 extern void record_alignment (segT seg, int align);
 173 extern int get_recorded_alignment (segT seg);
 174 extern void subsegs_finish (void);
 175 extern void write_object_file (void);
 176 extern long relax_frag (segT, fragS *, long);
 177 extern int relax_segment (struct frag *, segT, int);
 178 extern void number_to_chars_littleendian (char *, valueT, int);
 179 extern void number_to_chars_bigendian (char *, valueT, int);
 180 extern fixS *fix_new
 181   (fragS * frag, int where, int size, symbolS * add_symbol,
 182    offsetT offset, int pcrel, bfd_reloc_code_real_type r_type);
 183 extern fixS *fix_at_start
 184   (fragS * frag, int size, symbolS * add_symbol,
 185    offsetT offset, int pcrel, bfd_reloc_code_real_type r_type);
 186 extern fixS *fix_new_exp
 187   (fragS * frag, int where, int size, expressionS *exp, int pcrel,
 188    bfd_reloc_code_real_type r_type);
 189 extern void write_print_statistics (FILE *);
 190
 191 #endif /* __write_h__ */