| 1 | /* tc-i960.h - Basic 80960 instruction formats. |
| 2 | Copyright 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1997, 1998, 1999, |
| 3 | 2000 |
| 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, 59 Temple Place - Suite 330, Boston, MA |
| 21 | 02111-1307, 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 SYMBOLS_NEED_BACKPOINTERS |
| 56 | #define LOCAL_LABELS_FB 1 |
| 57 | #define BITFIELD_CONS_EXPRESSIONS |
| 58 | |
| 59 | /* tailor the coff format */ |
| 60 | #define BFD_ARCH bfd_arch_i960 |
| 61 | #define COFF_FLAGS F_AR32WR |
| 62 | #define COFF_MAGIC I960ROMAGIC |
| 63 | #define OBJ_COFF_SECTION_HEADER_HAS_ALIGNMENT |
| 64 | #define OBJ_COFF_MAX_AUXENTRIES (2) |
| 65 | #define TC_COUNT_RELOC(FIXP) (!(FIXP)->fx_done) |
| 66 | #define TC_COFF_FIX2RTYPE(FIXP) tc_coff_fix2rtype(FIXP) |
| 67 | #define TC_COFF_SIZEMACHDEP(FRAGP) tc_coff_sizemachdep(FRAGP) |
| 68 | #define TC_COFF_SET_MACHINE(HDRS) tc_headers_hook (HDRS) |
| 69 | extern void tc_headers_hook (); |
| 70 | extern short tc_coff_fix2rtype (); |
| 71 | extern int tc_coff_sizemachdep (); |
| 72 | |
| 73 | /* MEANING OF 'n_other' in the symbol record. |
| 74 | * |
| 75 | * If non-zero, the 'n_other' fields indicates either a leaf procedure or |
| 76 | * a system procedure, as follows: |
| 77 | * |
| 78 | * 1 <= n_other <= 32 : |
| 79 | * The symbol is the entry point to a system procedure. |
| 80 | * 'n_value' is the address of the entry, as for any other |
| 81 | * procedure. The system procedure number (which can be used in |
| 82 | * a 'calls' instruction) is (n_other-1). These entries come from |
| 83 | * '.sysproc' directives. |
| 84 | * |
| 85 | * n_other == N_CALLNAME |
| 86 | * the symbol is the 'call' entry point to a leaf procedure. |
| 87 | * The *next* symbol in the symbol table must be the corresponding |
| 88 | * 'bal' entry point to the procedure (see following). These |
| 89 | * entries come from '.leafproc' directives in which two different |
| 90 | * symbols are specified (the first one is represented here). |
| 91 | * |
| 92 | * |
| 93 | * n_other == N_BALNAME |
| 94 | * the symbol is the 'bal' entry point to a leaf procedure. |
| 95 | * These entries result from '.leafproc' directives in which only |
| 96 | * one symbol is specified, or in which the same symbol is |
| 97 | * specified twice. |
| 98 | * |
| 99 | * Note that an N_CALLNAME entry *must* have a corresponding N_BALNAME entry, |
| 100 | * but not every N_BALNAME entry must have an N_CALLNAME entry. |
| 101 | */ |
| 102 | #define N_CALLNAME ((char)-1) |
| 103 | #define N_BALNAME ((char)-2) |
| 104 | |
| 105 | /* i960 uses a custom relocation record. */ |
| 106 | |
| 107 | /* let obj-aout.h know */ |
| 108 | #define CUSTOM_RELOC_FORMAT 1 |
| 109 | /* let aout_gnu.h know */ |
| 110 | #define N_RELOCATION_INFO_DECLARED 1 |
| 111 | struct relocation_info |
| 112 | { |
| 113 | int r_address; /* File address of item to be relocated */ |
| 114 | unsigned |
| 115 | r_index:24, /* Index of symbol on which relocation is based*/ |
| 116 | r_pcrel:1, /* 1 => relocate PC-relative; else absolute |
| 117 | * On i960, pc-relative implies 24-bit |
| 118 | * address, absolute implies 32-bit. |
| 119 | */ |
| 120 | r_length:2, /* Number of bytes to relocate: |
| 121 | * 0 => 1 byte |
| 122 | * 1 => 2 bytes |
| 123 | * 2 => 4 bytes -- only value used for i960 |
| 124 | */ |
| 125 | r_extern:1, r_bsr:1, /* Something for the GNU NS32K assembler */ |
| 126 | r_disp:1, /* Something for the GNU NS32K assembler */ |
| 127 | r_callj:1, /* 1 if relocation target is an i960 'callj' */ |
| 128 | nuthin:1; /* Unused */ |
| 129 | }; |
| 130 | |
| 131 | #ifdef OBJ_COFF |
| 132 | |
| 133 | /* We store the bal information in the sy_tc field. */ |
| 134 | #define TC_SYMFIELD_TYPE symbolS * |
| 135 | |
| 136 | #define TC_ADJUST_RELOC_COUNT(FIXP,COUNT) \ |
| 137 | { fixS *tcfixp = (FIXP); \ |
| 138 | for (;tcfixp;tcfixp=tcfixp->fx_next) \ |
| 139 | if (tcfixp->fx_tcbit && tcfixp->fx_addsy != 0) \ |
| 140 | ++(COUNT); \ |
| 141 | } |
| 142 | #endif |
| 143 | |
| 144 | extern int i960_validate_fix PARAMS ((struct fix *, segT, symbolS **)); |
| 145 | #define TC_VALIDATE_FIX(FIXP,SEGTYPE,LABEL) \ |
| 146 | if (i960_validate_fix (FIXP, SEGTYPE, &add_symbolP) != 0) goto LABEL |
| 147 | |
| 148 | #ifdef OBJ_ELF |
| 149 | #define TC_RELOC_RTSYM_LOC_FIXUP(FIX) \ |
| 150 | ((FIX)->fx_addsy == NULL \ |
| 151 | || (! S_IS_EXTERNAL ((FIX)->fx_addsy) \ |
| 152 | && ! S_IS_WEAK ((FIX)->fx_addsy) \ |
| 153 | && S_IS_DEFINED ((FIX)->fx_addsy) \ |
| 154 | && ! S_IS_COMMON ((FIX)->fx_addsy))) |
| 155 | #endif |
| 156 | |
| 157 | #ifndef OBJ_ELF |
| 158 | #define tc_fix_adjustable(FIXP) ((FIXP)->fx_bsr == 0) |
| 159 | /* This arranges for gas/write.c to not apply a relocation if |
| 160 | tc_fix_adjustable() says it is not adjustable. */ |
| 161 | #define TC_FIX_ADJUSTABLE(fixP) tc_fix_adjustable (fixP) |
| 162 | #else |
| 163 | #define tc_fix_adjustable(FIXP) \ |
| 164 | ((FIXP)->fx_bsr == 0 \ |
| 165 | && ! S_IS_EXTERNAL ((FIXP)->fx_addsy) \ |
| 166 | && ! S_IS_WEAK ((FIXP)->fx_addsy)) |
| 167 | #endif |
| 168 | |
| 169 | extern void brtab_emit PARAMS ((void)); |
| 170 | #define md_end() brtab_emit () |
| 171 | |
| 172 | extern void reloc_callj (); |
| 173 | |
| 174 | extern void tc_set_bal_of_call PARAMS ((symbolS *, symbolS *)); |
| 175 | |
| 176 | extern struct symbol *tc_get_bal_of_call PARAMS ((symbolS *)); |
| 177 | |
| 178 | extern void i960_handle_align (); |
| 179 | #define HANDLE_ALIGN(FRAG) i960_handle_align (FRAG) |
| 180 | #define NEED_FX_R_TYPE |
| 181 | #define NO_RELOC -1 |
| 182 | |
| 183 | #define md_operand(x) |
| 184 | |
| 185 | extern const struct relax_type md_relax_table[]; |
| 186 | #define TC_GENERIC_RELAX_TABLE md_relax_table |
| 187 | |
| 188 | #define LINKER_RELAXING_SHRINKS_ONLY |
| 189 | |
| 190 | #define TC_FIX_TYPE struct { unsigned bsr : 1; } |
| 191 | #define fx_bsr tc_fix_data.bsr |
| 192 | #define TC_INIT_FIX_DATA(F) ((F)->tc_fix_data.bsr = 0) |
| 193 | |
| 194 | #endif |