gas/write.h

   1 /* write.h
   2    Copyright (C) 1987, 92, 93, 94, 95, 96, 97, 2000
   3    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, 59 Temple Place - Suite 330, Boston, MA
  20    02111-1307, 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 #define FAKE_LABEL_NAME "L0\001"
  44
  45 #include "bit_fix.h"
  46
  47 /*
  48  * FixSs may be built up in any order.
  49  */
  50
  51 struct fix
  52 {
  53   /* These small fields are grouped together for compactness of
  54      this structure, and efficiency of access on some architectures.  */
  55
  56   /* pc-relative offset adjust (only used by m68k) */
  57   char fx_pcrel_adjust;
  58
  59   /* How many bytes are involved? */
  60   unsigned char fx_size;
  61
  62   /* Is this a pc-relative relocation?  */
  63   unsigned fx_pcrel : 1;
  64
  65   /* Is this a relocation to a procedure linkage table entry?  If so,
  66      some of the reductions we try to apply are invalid.  A better way
  67      might be to represent PLT entries with different kinds of
  68      symbols, and use normal relocations (with undefined symbols);
  69      look into it for version 2.6.  */
  70   unsigned fx_plt : 1;
  71
  72   /* Is this value an immediate displacement?  */
  73   /* Only used on i960 and ns32k; merge it into TC_FIX_TYPE sometime.  */
  74   unsigned fx_im_disp : 2;
  75
  76   /* A bit for the CPU specific code.
  77      This probably can be folded into tc_fix_data, below.  */
  78   unsigned fx_tcbit : 1;
  79
  80   /* Has this relocation already been applied?  */
  81   unsigned fx_done : 1;
  82
  83   /* Suppress overflow complaints on large addends.  This is used
  84      in the PowerPC ELF config to allow large addends on the
  85      BFD_RELOC_{LO16,HI16,HI16_S} relocations.
  86
  87      @@ Can this be determined from BFD?  */
  88   unsigned fx_no_overflow : 1;
  89
  90   /* The value is signed when checking for overflow.  */
  91   unsigned fx_signed : 1;
  92
  93   /* Which frag does this fix apply to?  */
  94   fragS *fx_frag;
  95
  96   /* Where is the first byte to fix up?  */
  97   long fx_where;
  98
  99   /* NULL or Symbol whose value we add in.  */
 100   symbolS *fx_addsy;
 101
 102   /* NULL or Symbol whose value we subtract.  */
 103   symbolS *fx_subsy;
 104
 105   /* Absolute number we add in.  */
 106   valueT fx_offset;
 107
 108   /* Next fixS in linked list, or NULL.  */
 109   struct fix *fx_next;
 110
 111   /* If NULL, no bitfix's to do.  */
 112   /* Only i960-coff and ns32k use this, and i960-coff stores an
 113      integer.  This can probably be folded into tc_fix_data, below.
 114      @@ Alpha also uses it, but only to disable certain relocation
 115      processing.  */
 116   bit_fixS *fx_bit_fixP;
 117
 118 #ifdef BFD_ASSEMBLER
 119   bfd_reloc_code_real_type fx_r_type;
 120 #else
 121 #ifdef NEED_FX_R_TYPE
 122   /* Hack for machines where the type of reloc can't be
 123      worked out by looking at how big it is.  */
 124   int fx_r_type;
 125 #endif
 126 #endif
 127
 128   /* This field is sort of misnamed.  It appears to be a sort of random
 129      scratch field, for use by the back ends.  The main gas code doesn't
 130      do anything but initialize it to zero.  The use of it does need to
 131      be coordinated between the cpu and format files, though.  E.g., some
 132      coff targets pass the `addend' field from the cpu file via this
 133      field.  I don't know why the `fx_offset' field above can't be used
 134      for that; investigate later and document. KR  */
 135   valueT fx_addnumber;
 136
 137   /* The location of the instruction which created the reloc, used
 138      in error messages.  */
 139   char *fx_file;
 140   unsigned fx_line;
 141
 142 #ifdef USING_CGEN
 143   struct {
 144     /* CGEN_INSN entry for this instruction.  */
 145     const struct cgen_insn *insn;
 146     /* Target specific data, usually reloc number.  */
 147     int opinfo;
 148   } fx_cgen;
 149 #endif
 150
 151 #ifdef TC_FIX_TYPE
 152   /* Location where a backend can attach additional data
 153      needed to perform fixups.  */
 154   TC_FIX_TYPE tc_fix_data;
 155 #endif
 156 };
 157
 158 typedef struct fix fixS;
 159
 160 #ifndef BFD_ASSEMBLER
 161 extern char *next_object_file_charP;
 162
 163 #ifndef MANY_SEGMENTS
 164 COMMON fixS *text_fix_root, *text_fix_tail;     /* Chains fixSs.  */
 165 COMMON fixS *data_fix_root, *data_fix_tail;     /* Chains fixSs.  */
 166 COMMON fixS *bss_fix_root, *bss_fix_tail;       /* Chains fixSs.  */
 167 extern struct frag *text_last_frag;             /* Last frag in segment.  */
 168 extern struct frag *data_last_frag;             /* Last frag in segment.  */
 169 #endif
 170 COMMON fixS **seg_fix_rootP, **seg_fix_tailP;   /* -> one of above.  */
 171 #endif
 172
 173 extern long string_byte_count;
 174 extern int section_alignment[];
 175
 176 extern bit_fixS *bit_fix_new
 177   PARAMS ((int size, int offset, long base_type, long base_adj, long min,
 178            long max, long add));
 179 extern void append PARAMS ((char **charPP, char *fromP, unsigned long length));
 180 extern void record_alignment PARAMS ((segT seg, int align));
 181 extern int get_recorded_alignment PARAMS ((segT seg));
 182 extern void subsegs_finish PARAMS ((void));
 183 extern void write_object_file PARAMS ((void));
 184 extern long relax_frag PARAMS ((fragS *, long));
 185 extern void relax_segment
 186   PARAMS ((struct frag * seg_frag_root, segT seg_type));
 187
 188 extern void number_to_chars_littleendian PARAMS ((char *, valueT, int));
 189 extern void number_to_chars_bigendian    PARAMS ((char *, valueT, int));
 190
 191 #ifdef BFD_ASSEMBLER
 192 extern fixS *fix_new
 193   PARAMS ((fragS * frag, int where, int size, symbolS * add_symbol,
 194            offsetT offset, int pcrel, bfd_reloc_code_real_type r_type));
 195 extern fixS *fix_new_exp
 196   PARAMS ((fragS * frag, int where, int size, expressionS *exp, int pcrel,
 197            bfd_reloc_code_real_type r_type));
 198 #else
 199 extern fixS *fix_new
 200   PARAMS ((fragS * frag, int where, int size, symbolS * add_symbol,
 201            offsetT offset, int pcrel, int r_type));
 202 extern fixS *fix_new_exp
 203   PARAMS ((fragS * frag, int where, int size, expressionS *exp, int pcrel,
 204            int r_type));
 205 #endif
 206
 207 extern void write_print_statistics PARAMS ((FILE *));
 208
 209 #endif /* __write_h__ */