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