gas/write.h

   1 /* write.h
   2    Copyright (C) 1987, 92, 93, 94, 95, 96, 1997 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 2, 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, 59 Temple Place - Suite 330, Boston, MA
  19    02111-1307, USA.  */
  20
  21 #ifndef __write_h__
  22 #define __write_h__
  23
  24 #ifndef TC_I960
  25 #ifdef hpux
  26 #define EXEC_MACHINE_TYPE HP9000S200_ID
  27 #endif
  28 #endif /* TC_I960 */
  29
  30 #ifndef BFD_ASSEMBLER
  31
  32 #ifndef LOCAL_LABEL
  33 #define LOCAL_LABEL(name) (name [0] == 'L' )
  34 #endif
  35
  36 #define S_LOCAL_NAME(s) (LOCAL_LABEL (S_GET_NAME (s)))
  37
  38 #endif /* ! BFD_ASSEMBLER */
  39
  40 /* This is the name of a fake symbol which will never appear in the
  41    assembler output.  S_IS_LOCAL detects it because of the \001.  */
  42 #define FAKE_LABEL_NAME "L0\001"
  43
  44 #include "bit_fix.h"
  45
  46 /*
  47  * FixSs may be built up in any order.
  48  */
  49
  50 struct fix
  51 {
  52   /* These small fields are grouped together for compactness of
  53      this structure, and efficiency of access on some architectures.  */
  54
  55   /* pc-relative offset adjust (only used by m68k) */
  56   char fx_pcrel_adjust;
  57
  58   /* How many bytes are involved? */
  59   unsigned char fx_size;
  60
  61   /* Is this a pc-relative relocation?  */
  62   unsigned fx_pcrel : 1;
  63
  64   /* Is this a relocation to a procedure linkage table entry?  If so,
  65      some of the reductions we try to apply are invalid.  A better way
  66      might be to represent PLT entries with different kinds of
  67      symbols, and use normal relocations (with undefined symbols);
  68      look into it for version 2.6.  */
  69   unsigned fx_plt : 1;
  70
  71   /* Is this value an immediate displacement?  */
  72   /* Only used on i960 and ns32k; merge it into TC_FIX_TYPE sometime.  */
  73   unsigned fx_im_disp : 2;
  74
  75   /* A bit for the CPU specific code.
  76      This probably can be folded into tc_fix_data, below.  */
  77   unsigned fx_tcbit : 1;
  78
  79   /* Has this relocation already been applied?  */
  80   unsigned fx_done : 1;
  81
  82   /* Suppress overflow complaints on large addends.  This is used
  83      in the PowerPC ELF config to allow large addends on the
  84      BFD_RELOC_{LO16,HI16,HI16_S} relocations.
  85
  86      @@ Can this be determined from BFD?  */
  87   unsigned fx_no_overflow : 1;
  88
  89   /* The value is signed when checking for overflow.  */
  90   unsigned fx_signed : 1;
  91
  92   /* Which frag does this fix apply to?  */
  93   fragS *fx_frag;
  94
  95   /* Where is the first byte to fix up?  */
  96   long fx_where;
  97
  98   /* NULL or Symbol whose value we add in. */
  99   symbolS *fx_addsy;
 100
 101   /* NULL or Symbol whose value we subtract. */
 102   symbolS *fx_subsy;
 103
 104   /* Absolute number we add in. */
 105   valueT fx_offset;
 106
 107   /* Next fixS in linked list, or NULL.  */
 108   struct fix *fx_next;
 109
 110   /* If NULL, no bitfix's to do.  */
 111   /* Only i960-coff and ns32k use this, and i960-coff stores an
 112      integer.  This can probably be folded into tc_fix_data, below.
 113      @@ Alpha also uses it, but only to disable certain relocation
 114      processing.  */
 115   bit_fixS *fx_bit_fixP;
 116
 117 #ifdef BFD_ASSEMBLER
 118   bfd_reloc_code_real_type fx_r_type;
 119 #else
 120 #ifdef NEED_FX_R_TYPE
 121   /* Hack for machines where the type of reloc can't be
 122      worked out by looking at how big it is.  */
 123   int fx_r_type;
 124 #endif
 125 #endif
 126
 127   /* This field is sort of misnamed.  It appears to be a sort of random
 128      scratch field, for use by the back ends.  The main gas code doesn't
 129      do anything but initialize it to zero.  The use of it does need to
 130      be coordinated between the cpu and format files, though.  E.g., some
 131      coff targets pass the `addend' field from the cpu file via this
 132      field.  I don't know why the `fx_offset' field above can't be used
 133      for that; investigate later and document. KR  */
 134   valueT fx_addnumber;
 135
 136   /* The location of the instruction which created the reloc, used
 137      in error messages.  */
 138   char *fx_file;
 139   unsigned fx_line;
 140
 141 #ifdef USING_CGEN
 142   struct {
 143     /* CGEN_INSN entry for this instruction.  */
 144     const struct cgen_insn *insn;
 145     /* Target specific data, usually reloc number.  */
 146     int opinfo;
 147   } fx_cgen;
 148 #endif
 149
 150 #ifdef TC_FIX_TYPE
 151   /* Location where a backend can attach additional data
 152      needed to perform fixups.  */
 153   TC_FIX_TYPE tc_fix_data;
 154 #endif
 155 };
 156
 157 typedef struct fix fixS;
 158
 159 #ifndef BFD_ASSEMBLER
 160 extern char *next_object_file_charP;
 161
 162 #ifndef MANY_SEGMENTS
 163 COMMON fixS *text_fix_root, *text_fix_tail;     /* Chains fixSs. */
 164 COMMON fixS *data_fix_root, *data_fix_tail;     /* Chains fixSs. */
 165 COMMON fixS *bss_fix_root, *bss_fix_tail;       /* Chains fixSs. */
 166 extern struct frag *text_last_frag;             /* Last frag in segment. */
 167 extern struct frag *data_last_frag;             /* Last frag in segment. */
 168 #endif
 169 COMMON fixS **seg_fix_rootP, **seg_fix_tailP;   /* -> one of above. */
 170 #endif
 171
 172 extern long string_byte_count;
 173 extern int section_alignment[];
 174
 175 extern bit_fixS *bit_fix_new
 176   PARAMS ((int size, int offset, long base_type, long base_adj, long min,
 177            long max, long add));
 178 extern void append PARAMS ((char **charPP, char *fromP, unsigned long length));
 179 extern void record_alignment PARAMS ((segT seg, int align));
 180 extern void subsegs_finish PARAMS ((void));
 181 extern void write_object_file PARAMS ((void));
 182 extern long relax_frag PARAMS ((fragS *, long));
 183 extern void relax_segment
 184   PARAMS ((struct frag * seg_frag_root, segT seg_type));
 185
 186 extern void number_to_chars_littleendian PARAMS ((char *, valueT, int));
 187 extern void number_to_chars_bigendian    PARAMS ((char *, valueT, int));
 188
 189 #ifdef BFD_ASSEMBLER
 190 extern fixS *fix_new
 191   PARAMS ((fragS * frag, int where, int size, symbolS * add_symbol,
 192            offsetT offset, int pcrel, bfd_reloc_code_real_type r_type));
 193 extern fixS *fix_new_exp
 194   PARAMS ((fragS * frag, int where, int size, expressionS *exp, int pcrel,
 195            bfd_reloc_code_real_type r_type));
 196 #else
 197 extern fixS *fix_new
 198   PARAMS ((fragS * frag, int where, int size, symbolS * add_symbol,
 199            offsetT offset, int pcrel, int r_type));
 200 extern fixS *fix_new_exp
 201   PARAMS ((fragS * frag, int where, int size, expressionS *exp, int pcrel,
 202            int r_type));
 203 #endif
 204
 205 extern void write_print_statistics PARAMS ((FILE *));
 206
 207 #endif /* __write_h__ */
 208 /* end of write.h */