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  1. /* write.h
  2.    Copyright (C) 1987-2015 Free Software Foundation, Inc.
  3.  
  4.    This file is part of GAS, the GNU Assembler.
  5.  
  6.    GAS is free software; you can redistribute it and/or modify
  7.    it under the terms of the GNU General Public License as published by
  8.    the Free Software Foundation; either version 3, or (at your option)
  9.    any later version.
  10.  
  11.    GAS is distributed in the hope that it will be useful,
  12.    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13.    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14.    GNU General Public License for more details.
  15.  
  16.    You should have received a copy of the GNU General Public License
  17.    along with GAS; see the file COPYING.  If not, write to the Free
  18.    Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
  19.    02110-1301, USA.  */
  20.  
  21. #ifndef __write_h__
  22. #define __write_h__
  23.  
  24. /* This is the name of a fake symbol which will never appear in the
  25.    assembler output.  S_IS_LOCAL detects it because of the \001.  */
  26. #ifndef FAKE_LABEL_NAME
  27. #define FAKE_LABEL_NAME "L0\001"
  28. #endif
  29.  
  30. #include "bit_fix.h"
  31.  
  32. /*
  33.  * FixSs may be built up in any order.
  34.  */
  35.  
  36. struct fix
  37. {
  38.   /* These small fields are grouped together for compactness of
  39.      this structure, and efficiency of access on some architectures.  */
  40.  
  41.   /* Is this a pc-relative relocation?  */
  42.   unsigned fx_pcrel : 1;
  43.  
  44.   /* Is this value an immediate displacement?  */
  45.   /* Only used on ns32k; merge it into TC_FIX_TYPE sometime.  */
  46.   unsigned fx_im_disp : 2;
  47.  
  48.   /* Some bits for the CPU specific code.  */
  49.   unsigned fx_tcbit : 1;
  50.   unsigned fx_tcbit2 : 1;
  51.  
  52.   /* Has this relocation already been applied?  */
  53.   unsigned fx_done : 1;
  54.  
  55.   /* Suppress overflow complaints on large addends.  This is used
  56.      in the PowerPC ELF config to allow large addends on the
  57.      BFD_RELOC_{LO16,HI16,HI16_S} relocations.
  58.  
  59.      @@ Can this be determined from BFD?  */
  60.   unsigned fx_no_overflow : 1;
  61.  
  62.   /* The value is signed when checking for overflow.  */
  63.   unsigned fx_signed : 1;
  64.  
  65.   /* pc-relative offset adjust (only used by some CPU specific code) */
  66.   signed char fx_pcrel_adjust;
  67.  
  68.   /* How many bytes are involved? */
  69.   unsigned char fx_size;
  70.  
  71.   /* Which frag does this fix apply to?  */
  72.   fragS *fx_frag;
  73.  
  74.   /* Where is the first byte to fix up?  */
  75.   long fx_where;
  76.  
  77.   /* NULL or Symbol whose value we add in.  */
  78.   symbolS *fx_addsy;
  79.  
  80.   /* NULL or Symbol whose value we subtract.  */
  81.   symbolS *fx_subsy;
  82.  
  83.   /* Absolute number we add in.  */
  84.   valueT fx_offset;
  85.  
  86.   /* The value of dot when the fixup expression was parsed.  */
  87.   addressT fx_dot_value;
  88.  
  89.   /* The frag fx_dot_value is based on.  */
  90.   fragS *fx_dot_frag;
  91.  
  92.   /* Next fixS in linked list, or NULL.  */
  93.   struct fix *fx_next;
  94.  
  95.   /* If NULL, no bitfix's to do.  */
  96.   /* Only i960-coff and ns32k use this, and i960-coff stores an
  97.      integer.  This can probably be folded into tc_fix_data, below.
  98.      @@ Alpha also uses it, but only to disable certain relocation
  99.      processing.  */
  100.   bit_fixS *fx_bit_fixP;
  101.  
  102.   bfd_reloc_code_real_type fx_r_type;
  103.  
  104.   /* This field is sort of misnamed.  It appears to be a sort of random
  105.      scratch field, for use by the back ends.  The main gas code doesn't
  106.      do anything but initialize it to zero.  The use of it does need to
  107.      be coordinated between the cpu and format files, though.  E.g., some
  108.      coff targets pass the `addend' field from the cpu file via this
  109.      field.  I don't know why the `fx_offset' field above can't be used
  110.      for that; investigate later and document. KR  */
  111.   valueT fx_addnumber;
  112.  
  113.   /* The location of the instruction which created the reloc, used
  114.      in error messages.  */
  115.   char *fx_file;
  116.   unsigned fx_line;
  117.  
  118. #ifdef USING_CGEN
  119.   struct {
  120.     /* CGEN_INSN entry for this instruction.  */
  121.     const struct cgen_insn *insn;
  122.     /* Target specific data, usually reloc number.  */
  123.     int opinfo;
  124.     /* Which ifield this fixup applies to. */
  125.     struct cgen_maybe_multi_ifield * field;
  126.     /* is this field is the MSB field in a set? */
  127.     int msb_field_p;
  128.   } fx_cgen;
  129. #endif
  130.  
  131. #ifdef TC_FIX_TYPE
  132.   /* Location where a backend can attach additional data
  133.      needed to perform fixups.  */
  134.   TC_FIX_TYPE tc_fix_data;
  135. #endif
  136. };
  137.  
  138. typedef struct fix fixS;
  139.  
  140. struct reloc_list
  141. {
  142.   struct reloc_list *next;
  143.   union
  144.   {
  145.     struct
  146.     {
  147.       symbolS *offset_sym;
  148.       reloc_howto_type *howto;
  149.       symbolS *sym;
  150.       bfd_vma addend;
  151.     } a;
  152.     struct
  153.     {
  154.       asection *sec;
  155.       asymbol *s;
  156.       arelent r;
  157.     } b;
  158.   } u;
  159.   char *file;
  160.   unsigned int line;
  161. };
  162.  
  163. extern int finalize_syms;
  164. extern symbolS *abs_section_sym;
  165. extern addressT dot_value;
  166. extern fragS *dot_frag;
  167. extern struct reloc_list* reloc_list;
  168.  
  169. extern void append (char **charPP, char *fromP, unsigned long length);
  170. extern void record_alignment (segT seg, int align);
  171. extern int get_recorded_alignment (segT seg);
  172. extern void write_object_file (void);
  173. extern long relax_frag (segT, fragS *, long);
  174. extern int relax_segment (struct frag *, segT, int);
  175. extern void number_to_chars_littleendian (char *, valueT, int);
  176. extern void number_to_chars_bigendian (char *, valueT, int);
  177. extern fixS *fix_new
  178.   (fragS * frag, int where, int size, symbolS * add_symbol,
  179.    offsetT offset, int pcrel, bfd_reloc_code_real_type r_type);
  180. extern fixS *fix_at_start
  181.   (fragS * frag, int size, symbolS * add_symbol,
  182.    offsetT offset, int pcrel, bfd_reloc_code_real_type r_type);
  183. extern fixS *fix_new_exp
  184.   (fragS * frag, int where, int size, expressionS *exp, int pcrel,
  185.    bfd_reloc_code_real_type r_type);
  186. extern void write_print_statistics (FILE *);
  187.  
  188. #endif /* __write_h__ */
  189.