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, 1998
   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 #define TARGET_BYTES_BIG_ENDIAN 0
  26
  27 #define WORKING_DOT_WORD
  28
  29 /*
  30  * The 'COJ' instructions are actually COBR instructions with the 'b' in
  31  * the mnemonic replaced by a 'j';  they are ALWAYS "de-optimized" if necessary:
  32  * if the displacement will not fit in 13 bits, the assembler will replace them
  33  * with the corresponding compare and branch instructions.
  34  *
  35  * All of the 'MEMn' instructions are the same format; the 'n' in the name
  36  * indicates the default index scale factor (the size of the datum operated on).
  37  *
  38  * The FBRA formats are not actually an instruction format.  They are the
  39  * "convenience directives" for branching on floating-point comparisons,
  40  * each of which generates 2 instructions (a 'bno' and one other branch).
  41  *
  42  * The CALLJ format is not actually an instruction format.  It indicates that
  43  * the instruction generated (a CTRL-format 'call') should have its relocation
  44  * specially flagged for link-time replacement with a 'bal' or 'calls' if
  45  * appropriate.
  46  */
  47
  48 /* tailor gas */
  49 #define SYMBOLS_NEED_BACKPOINTERS
  50 #define LOCAL_LABELS_FB 1
  51 #define BITFIELD_CONS_EXPRESSIONS
  52
  53 /* tailor the coff format */
  54 #define BFD_ARCH                                bfd_arch_i960
  55 #define COFF_FLAGS                              F_AR32WR
  56 #define COFF_MAGIC                              I960ROMAGIC
  57 #define OBJ_COFF_SECTION_HEADER_HAS_ALIGNMENT
  58 #define OBJ_COFF_MAX_AUXENTRIES                 (2)
  59 #define TC_COUNT_RELOC(FIXP)                    (!(FIXP)->fx_done)
  60 #define TC_COFF_FIX2RTYPE(FIXP)                 tc_coff_fix2rtype(FIXP)
  61 #define TC_COFF_SIZEMACHDEP(FRAGP)              tc_coff_sizemachdep(FRAGP)
  62 #define TC_COFF_SET_MACHINE(HDRS)               tc_headers_hook (HDRS)
  63 extern void tc_headers_hook ();
  64 extern short tc_coff_fix2rtype ();
  65 extern int tc_coff_sizemachdep ();
  66
  67 /* MEANING OF 'n_other' in the symbol record.
  68  *
  69  * If non-zero, the 'n_other' fields indicates either a leaf procedure or
  70  * a system procedure, as follows:
  71  *
  72  *      1 <= n_other <= 32 :
  73  *              The symbol is the entry point to a system procedure.
  74  *              'n_value' is the address of the entry, as for any other
  75  *              procedure.  The system procedure number (which can be used in
  76  *              a 'calls' instruction) is (n_other-1).  These entries come from
  77  *              '.sysproc' directives.
  78  *
  79  *      n_other == N_CALLNAME
  80  *              the symbol is the 'call' entry point to a leaf procedure.
  81  *              The *next* symbol in the symbol table must be the corresponding
  82  *              'bal' entry point to the procedure (see following).  These
  83  *              entries come from '.leafproc' directives in which two different
  84  *              symbols are specified (the first one is represented here).
  85  *
  86  *
  87  *      n_other == N_BALNAME
  88  *              the symbol is the 'bal' entry point to a leaf procedure.
  89  *              These entries result from '.leafproc' directives in which only
  90  *              one symbol is specified, or in which the same symbol is
  91  *              specified twice.
  92  *
  93  * Note that an N_CALLNAME entry *must* have a corresponding N_BALNAME entry,
  94  * but not every N_BALNAME entry must have an N_CALLNAME entry.
  95  */
  96 #define N_CALLNAME      ((char)-1)
  97 #define N_BALNAME       ((char)-2)
  98
  99 /* i960 uses a custom relocation record. */
 100
 101 /* let obj-aout.h know */
 102 #define CUSTOM_RELOC_FORMAT 1
 103 /* let aout_gnu.h know */
 104 #define N_RELOCATION_INFO_DECLARED 1
 105 struct relocation_info
 106   {
 107     int r_address;              /* File address of item to be relocated */
 108     unsigned
 109       r_index:24,               /* Index of symbol on which relocation is based*/
 110       r_pcrel:1,                /* 1 => relocate PC-relative; else absolute
 111                                  *      On i960, pc-relative implies 24-bit
 112                                  *      address, absolute implies 32-bit.
 113                                  */
 114       r_length:2,               /* Number of bytes to relocate:
 115                                  *      0 => 1 byte
 116                                  *      1 => 2 bytes
 117                                  *      2 => 4 bytes -- only value used for i960
 118                                  */
 119       r_extern:1, r_bsr:1,      /* Something for the GNU NS32K assembler */
 120       r_disp:1,                 /* Something for the GNU NS32K assembler */
 121       r_callj:1,                /* 1 if relocation target is an i960 'callj' */
 122       nuthin:1;                 /* Unused                               */
 123   };
 124
 125 #ifdef OBJ_COFF
 126
 127 /* We store the bal information in the sy_tc field.  */
 128 #define TC_SYMFIELD_TYPE struct symbol *
 129
 130 #define TC_ADJUST_RELOC_COUNT(FIXP,COUNT) \
 131   { fixS *tcfixp = (FIXP); \
 132     for (;tcfixp;tcfixp=tcfixp->fx_next) \
 133       if (tcfixp->fx_tcbit && tcfixp->fx_addsy != 0) \
 134         ++(COUNT); \
 135   }
 136 #endif
 137
 138 extern int i960_validate_fix PARAMS ((struct fix *, segT, struct symbol **));
 139 #define TC_VALIDATE_FIX(FIXP,SEGTYPE,LABEL) \
 140         if (i960_validate_fix (FIXP, SEGTYPE, &add_symbolP) != 0) goto LABEL
 141
 142 #define tc_fix_adjustable(FIXP)         ((FIXP)->fx_bsr == 0)
 143
 144 extern void brtab_emit PARAMS ((void));
 145 #define md_end()        brtab_emit ()
 146
 147 extern void reloc_callj ();
 148
 149 extern void tc_set_bal_of_call PARAMS ((struct symbol *, struct symbol *));
 150
 151 extern struct symbol *tc_get_bal_of_call PARAMS ((struct symbol *));
 152
 153 extern void i960_handle_align ();
 154 #define HANDLE_ALIGN(FRAG)      i960_handle_align (FRAG)
 155 #define NEED_FX_R_TYPE
 156 #define NO_RELOC -1
 157
 158 #define md_operand(x)
 159
 160 extern const struct relax_type md_relax_table[];
 161 #define TC_GENERIC_RELAX_TABLE md_relax_table
 162
 163 #define LINKER_RELAXING_SHRINKS_ONLY
 164
 165 #define TC_FIX_TYPE struct { unsigned bsr : 1; }
 166 #define fx_bsr tc_fix_data.bsr
 167 #define TC_INIT_FIX_DATA(F)     ((F)->tc_fix_data.bsr = 0)
 168
 169 #endif
 170
 171 /* end of tc-i960.h */