gas/config/tc-i960.h

   1 /* tc-i960.h - Basic 80960 instruction formats.
   2    Copyright 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1997, 1998, 1999,
   3    2000, 2001, 2002, 2003
   4    Free Software Foundation, Inc.
   5
   6    This file is part of GAS, the GNU Assembler.
   7
   8    GAS is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as
  10    published by the Free Software Foundation; either version 2,
  11    or (at your option) any later version.
  12
  13    GAS is distributed in the hope that it will be useful, but
  14    WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  16    the GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with GAS; see the file COPYING.  If not, write to the Free
  20    Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
  21    02110-1301, USA.  */
  22
  23 #ifndef TC_I960
  24 #define TC_I960 1
  25
  26 #ifdef OBJ_ELF
  27 #define TARGET_FORMAT "elf32-i960"
  28 #define TARGET_ARCH bfd_arch_i960
  29 #endif
  30
  31 #define TARGET_BYTES_BIG_ENDIAN 0
  32
  33 #define WORKING_DOT_WORD
  34
  35 /*
  36  * The 'COJ' instructions are actually COBR instructions with the 'b' in
  37  * the mnemonic replaced by a 'j';  they are ALWAYS "de-optimized" if necessary:
  38  * if the displacement will not fit in 13 bits, the assembler will replace them
  39  * with the corresponding compare and branch instructions.
  40  *
  41  * All of the 'MEMn' instructions are the same format; the 'n' in the name
  42  * indicates the default index scale factor (the size of the datum operated on).
  43  *
  44  * The FBRA formats are not actually an instruction format.  They are the
  45  * "convenience directives" for branching on floating-point comparisons,
  46  * each of which generates 2 instructions (a 'bno' and one other branch).
  47  *
  48  * The CALLJ format is not actually an instruction format.  It indicates that
  49  * the instruction generated (a CTRL-format 'call') should have its relocation
  50  * specially flagged for link-time replacement with a 'bal' or 'calls' if
  51  * appropriate.
  52  */
  53
  54 /* tailor gas */
  55 #define LOCAL_LABELS_FB 1
  56 #define BITFIELD_CONS_EXPRESSIONS
  57
  58 /* tailor the coff format */
  59 #define COFF_MAGIC                              I960ROMAGIC
  60 #define OBJ_COFF_MAX_AUXENTRIES                 (2)
  61
  62 /* MEANING OF 'n_other' in the symbol record.
  63  *
  64  * If non-zero, the 'n_other' fields indicates either a leaf procedure or
  65  * a system procedure, as follows:
  66  *
  67  *      1 <= n_other <= 32 :
  68  *              The symbol is the entry point to a system procedure.
  69  *              'n_value' is the address of the entry, as for any other
  70  *              procedure.  The system procedure number (which can be used in
  71  *              a 'calls' instruction) is (n_other-1).  These entries come from
  72  *              '.sysproc' directives.
  73  *
  74  *      n_other == N_CALLNAME
  75  *              the symbol is the 'call' entry point to a leaf procedure.
  76  *              The *next* symbol in the symbol table must be the corresponding
  77  *              'bal' entry point to the procedure (see following).  These
  78  *              entries come from '.leafproc' directives in which two different
  79  *              symbols are specified (the first one is represented here).
  80  *
  81  *
  82  *      n_other == N_BALNAME
  83  *              the symbol is the 'bal' entry point to a leaf procedure.
  84  *              These entries result from '.leafproc' directives in which only
  85  *              one symbol is specified, or in which the same symbol is
  86  *              specified twice.
  87  *
  88  * Note that an N_CALLNAME entry *must* have a corresponding N_BALNAME entry,
  89  * but not every N_BALNAME entry must have an N_CALLNAME entry.
  90  */
  91 #define N_CALLNAME      ((char)-1)
  92 #define N_BALNAME       ((char)-2)
  93
  94 /* i960 uses a custom relocation record.  */
  95
  96 /* let obj-aout.h know */
  97 #define CUSTOM_RELOC_FORMAT 1
  98 /* let aout_gnu.h know */
  99 #define N_RELOCATION_INFO_DECLARED 1
 100 struct relocation_info
 101   {
 102     int r_address;              /* File address of item to be relocated */
 103     unsigned
 104       r_index:24,               /* Index of symbol on which relocation is based*/
 105       r_pcrel:1,                /* 1 => relocate PC-relative; else absolute
 106                                  *      On i960, pc-relative implies 24-bit
 107                                  *      address, absolute implies 32-bit.
 108                                  */
 109       r_length:2,               /* Number of bytes to relocate:
 110                                  *      0 => 1 byte
 111                                  *      1 => 2 bytes
 112                                  *      2 => 4 bytes -- only value used for i960
 113                                  */
 114       r_extern:1, r_bsr:1,      /* Something for the GNU NS32K assembler */
 115       r_disp:1,                 /* Something for the GNU NS32K assembler */
 116       r_callj:1,                /* 1 if relocation target is an i960 'callj' */
 117       nuthin:1;                 /* Unused                               */
 118   };
 119
 120 /* No shared lib support, so we don't need to ensure externally
 121    visible symbols can be overridden.  */
 122 #define EXTERN_FORCE_RELOC 0
 123
 124 /* Makes no sense to use the difference of 2 arbitrary symbols
 125    as the target of a call instruction.  */
 126 #define TC_FORCE_RELOCATION_SUB_SAME(FIX, SEG)  \
 127   ((FIX)->fx_tcbit                              \
 128    || ! SEG_NORMAL (SEG)                        \
 129    || TC_FORCE_RELOCATION (FIX))
 130
 131 /* reloc_callj() may replace a 'call' with a 'calls' or a
 132    'bal', in which cases it modifies *fixP as appropriate.
 133    In the case of a 'calls', no further work is required.  */
 134 extern int reloc_callj PARAMS ((struct fix *));
 135
 136 #define TC_FORCE_RELOCATION_ABS(FIX)            \
 137   (TC_FORCE_RELOCATION (FIX)                    \
 138    || reloc_callj (FIX))
 139
 140 #define TC_FORCE_RELOCATION_LOCAL(FIX)          \
 141   (!(FIX)->fx_pcrel                             \
 142    || (FIX)->fx_plt                             \
 143    || TC_FORCE_RELOCATION (FIX)         \
 144    || reloc_callj (FIX))
 145
 146 #ifdef OBJ_COFF
 147
 148 /* We store the bal information in the sy_tc field.  */
 149 #define TC_SYMFIELD_TYPE symbolS *
 150
 151 #define TC_ADJUST_RELOC_COUNT(FIX,COUNT) \
 152   { fixS *tcfixp = (FIX); \
 153     for (;tcfixp;tcfixp=tcfixp->fx_next) \
 154       if (tcfixp->fx_tcbit && tcfixp->fx_addsy != 0) \
 155         ++(COUNT); \
 156   }
 157 #endif
 158
 159 extern int i960_validate_fix PARAMS ((struct fix *, segT));
 160 #define TC_VALIDATE_FIX(FIX,SEGTYPE,LABEL) \
 161         if (!i960_validate_fix (FIX, SEGTYPE)) goto LABEL
 162
 163 #define tc_fix_adjustable(FIX)          ((FIX)->fx_bsr == 0)
 164
 165 #ifndef OBJ_ELF
 166 /* Values passed to md_apply_fix sometimes include symbol values.  */
 167 #define MD_APPLY_SYM_VALUE(FIX) tc_fix_adjustable (FIX)
 168 #else
 169 /* Values passed to md_apply_fix don't include the symbol value.  */
 170 #define MD_APPLY_SYM_VALUE(FIX) 0
 171 #endif
 172
 173 extern void brtab_emit PARAMS ((void));
 174 #define md_end()        brtab_emit ()
 175
 176 extern void tc_set_bal_of_call PARAMS ((symbolS *, symbolS *));
 177
 178 extern struct symbol *tc_get_bal_of_call PARAMS ((symbolS *));
 179
 180 extern void i960_handle_align PARAMS ((struct frag *));
 181 #define HANDLE_ALIGN(FRAG)      i960_handle_align (FRAG)
 182 #define NO_RELOC -1
 183
 184 #define md_operand(x)
 185
 186 extern const struct relax_type md_relax_table[];
 187 #define TC_GENERIC_RELAX_TABLE md_relax_table
 188
 189 #define LINKER_RELAXING_SHRINKS_ONLY
 190
 191 #define TC_FIX_TYPE struct { unsigned bsr : 1; }
 192 #define fx_bsr tc_fix_data.bsr
 193 #define TC_INIT_FIX_DATA(F)     ((F)->tc_fix_data.bsr = 0)
 194
 195 #endif