gas/config/tc-i960.h

   1 /* tc-i960.h - Basic 80960 instruction formats.
   2    Copyright (C) 1989, 90, 91, 92, 93, 94, 95, 96, 97, 98, 1999
   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
   9    published by the Free Software Foundation; either version 2,
  10    or (at your option) any later version.
  11
  12    GAS is distributed in the hope that it will be useful, but
  13    WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  15    the 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 TC_I960
  23 #define TC_I960 1
  24
  25 #ifdef OBJ_ELF
  26 #define TARGET_FORMAT "elf32-i960"
  27 #define TARGET_ARCH bfd_arch_i960
  28 #endif
  29
  30 #define TARGET_BYTES_BIG_ENDIAN 0
  31
  32 #define WORKING_DOT_WORD
  33
  34 /*
  35  * The 'COJ' instructions are actually COBR instructions with the 'b' in
  36  * the mnemonic replaced by a 'j';  they are ALWAYS "de-optimized" if necessary:
  37  * if the displacement will not fit in 13 bits, the assembler will replace them
  38  * with the corresponding compare and branch instructions.
  39  *
  40  * All of the 'MEMn' instructions are the same format; the 'n' in the name
  41  * indicates the default index scale factor (the size of the datum operated on).
  42  *
  43  * The FBRA formats are not actually an instruction format.  They are the
  44  * "convenience directives" for branching on floating-point comparisons,
  45  * each of which generates 2 instructions (a 'bno' and one other branch).
  46  *
  47  * The CALLJ format is not actually an instruction format.  It indicates that
  48  * the instruction generated (a CTRL-format 'call') should have its relocation
  49  * specially flagged for link-time replacement with a 'bal' or 'calls' if
  50  * appropriate.
  51  */
  52
  53 /* tailor gas */
  54 #define SYMBOLS_NEED_BACKPOINTERS
  55 #define LOCAL_LABELS_FB 1
  56 #define BITFIELD_CONS_EXPRESSIONS
  57
  58 /* tailor the coff format */
  59 #define BFD_ARCH                                bfd_arch_i960
  60 #define COFF_FLAGS                              F_AR32WR
  61 #define COFF_MAGIC                              I960ROMAGIC
  62 #define OBJ_COFF_SECTION_HEADER_HAS_ALIGNMENT
  63 #define OBJ_COFF_MAX_AUXENTRIES                 (2)
  64 #define TC_COUNT_RELOC(FIXP)                    (!(FIXP)->fx_done)
  65 #define TC_COFF_FIX2RTYPE(FIXP)                 tc_coff_fix2rtype(FIXP)
  66 #define TC_COFF_SIZEMACHDEP(FRAGP)              tc_coff_sizemachdep(FRAGP)
  67 #define TC_COFF_SET_MACHINE(HDRS)               tc_headers_hook (HDRS)
  68 extern void tc_headers_hook ();
  69 extern short tc_coff_fix2rtype ();
  70 extern int tc_coff_sizemachdep ();
  71
  72 /* MEANING OF 'n_other' in the symbol record.
  73  *
  74  * If non-zero, the 'n_other' fields indicates either a leaf procedure or
  75  * a system procedure, as follows:
  76  *
  77  *      1 <= n_other <= 32 :
  78  *              The symbol is the entry point to a system procedure.
  79  *              'n_value' is the address of the entry, as for any other
  80  *              procedure.  The system procedure number (which can be used in
  81  *              a 'calls' instruction) is (n_other-1).  These entries come from
  82  *              '.sysproc' directives.
  83  *
  84  *      n_other == N_CALLNAME
  85  *              the symbol is the 'call' entry point to a leaf procedure.
  86  *              The *next* symbol in the symbol table must be the corresponding
  87  *              'bal' entry point to the procedure (see following).  These
  88  *              entries come from '.leafproc' directives in which two different
  89  *              symbols are specified (the first one is represented here).
  90  *
  91  *
  92  *      n_other == N_BALNAME
  93  *              the symbol is the 'bal' entry point to a leaf procedure.
  94  *              These entries result from '.leafproc' directives in which only
  95  *              one symbol is specified, or in which the same symbol is
  96  *              specified twice.
  97  *
  98  * Note that an N_CALLNAME entry *must* have a corresponding N_BALNAME entry,
  99  * but not every N_BALNAME entry must have an N_CALLNAME entry.
 100  */
 101 #define N_CALLNAME      ((char)-1)
 102 #define N_BALNAME       ((char)-2)
 103
 104 /* i960 uses a custom relocation record. */
 105
 106 /* let obj-aout.h know */
 107 #define CUSTOM_RELOC_FORMAT 1
 108 /* let aout_gnu.h know */
 109 #define N_RELOCATION_INFO_DECLARED 1
 110 struct relocation_info
 111   {
 112     int r_address;              /* File address of item to be relocated */
 113     unsigned
 114       r_index:24,               /* Index of symbol on which relocation is based*/
 115       r_pcrel:1,                /* 1 => relocate PC-relative; else absolute
 116                                  *      On i960, pc-relative implies 24-bit
 117                                  *      address, absolute implies 32-bit.
 118                                  */
 119       r_length:2,               /* Number of bytes to relocate:
 120                                  *      0 => 1 byte
 121                                  *      1 => 2 bytes
 122                                  *      2 => 4 bytes -- only value used for i960
 123                                  */
 124       r_extern:1, r_bsr:1,      /* Something for the GNU NS32K assembler */
 125       r_disp:1,                 /* Something for the GNU NS32K assembler */
 126       r_callj:1,                /* 1 if relocation target is an i960 'callj' */
 127       nuthin:1;                 /* Unused                               */
 128   };
 129
 130 #ifdef OBJ_COFF
 131
 132 /* We store the bal information in the sy_tc field.  */
 133 #define TC_SYMFIELD_TYPE struct symbol *
 134
 135 #define TC_ADJUST_RELOC_COUNT(FIXP,COUNT) \
 136   { fixS *tcfixp = (FIXP); \
 137     for (;tcfixp;tcfixp=tcfixp->fx_next) \
 138       if (tcfixp->fx_tcbit && tcfixp->fx_addsy != 0) \
 139         ++(COUNT); \
 140   }
 141 #endif
 142
 143 extern int i960_validate_fix PARAMS ((struct fix *, segT, struct symbol **));
 144 #define TC_VALIDATE_FIX(FIXP,SEGTYPE,LABEL) \
 145         if (i960_validate_fix (FIXP, SEGTYPE, &add_symbolP) != 0) goto LABEL
 146
 147 #ifdef OBJ_ELF
 148 #define TC_RELOC_RTSYM_LOC_FIXUP(FIX)  \
 149   ((FIX)->fx_addsy == NULL \
 150    || (! S_IS_EXTERNAL ((FIX)->fx_addsy) \
 151        && ! S_IS_WEAK ((FIX)->fx_addsy) \
 152        && S_IS_DEFINED ((FIX)->fx_addsy) \
 153        && ! S_IS_COMMON ((FIX)->fx_addsy)))
 154 #endif
 155
 156 #ifndef OBJ_ELF
 157 #define tc_fix_adjustable(FIXP)         ((FIXP)->fx_bsr == 0)
 158 #else
 159 #define tc_fix_adjustable(FIXP)                                         \
 160   ((FIXP)->fx_bsr == 0                                                  \
 161    && ! S_IS_EXTERNAL ((FIXP)->fx_addsy)                                \
 162    && ! S_IS_WEAK ((FIXP)->fx_addsy))
 163 #endif
 164
 165 extern void brtab_emit PARAMS ((void));
 166 #define md_end()        brtab_emit ()
 167
 168 extern void reloc_callj ();
 169
 170 extern void tc_set_bal_of_call PARAMS ((struct symbol *, struct symbol *));
 171
 172 extern struct symbol *tc_get_bal_of_call PARAMS ((struct symbol *));
 173
 174 extern void i960_handle_align ();
 175 #define HANDLE_ALIGN(FRAG)      i960_handle_align (FRAG)
 176 #define NEED_FX_R_TYPE
 177 #define NO_RELOC -1
 178
 179 #define md_operand(x)
 180
 181 extern const struct relax_type md_relax_table[];
 182 #define TC_GENERIC_RELAX_TABLE md_relax_table
 183
 184 #define LINKER_RELAXING_SHRINKS_ONLY
 185
 186 #define TC_FIX_TYPE struct { unsigned bsr : 1; }
 187 #define fx_bsr tc_fix_data.bsr
 188 #define TC_INIT_FIX_DATA(F)     ((F)->tc_fix_data.bsr = 0)
 189
 190 #endif
 191
 192 /* end of tc-i960.h */