| 1 | /* tc-i960.h - Basic 80960 instruction formats. |
| 2 | Copyright (C) 1989-2016 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 |
| 8 | published by the Free Software Foundation; either version 3, |
| 9 | or (at your option) any later version. |
| 10 | |
| 11 | GAS is distributed in the hope that it will be useful, but |
| 12 | WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See |
| 14 | the 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, 51 Franklin Street - Fifth Floor, Boston, MA |
| 19 | 02110-1301, USA. */ |
| 20 | |
| 21 | #ifndef TC_I960 |
| 22 | #define TC_I960 1 |
| 23 | |
| 24 | #ifdef OBJ_ELF |
| 25 | #define TARGET_FORMAT "elf32-i960" |
| 26 | #define TARGET_ARCH bfd_arch_i960 |
| 27 | #endif |
| 28 | |
| 29 | #define TARGET_BYTES_BIG_ENDIAN 0 |
| 30 | |
| 31 | #define WORKING_DOT_WORD |
| 32 | |
| 33 | /* |
| 34 | * The 'COJ' instructions are actually COBR instructions with the 'b' in |
| 35 | * the mnemonic replaced by a 'j'; they are ALWAYS "de-optimized" if necessary: |
| 36 | * if the displacement will not fit in 13 bits, the assembler will replace them |
| 37 | * with the corresponding compare and branch instructions. |
| 38 | * |
| 39 | * All of the 'MEMn' instructions are the same format; the 'n' in the name |
| 40 | * indicates the default index scale factor (the size of the datum operated on). |
| 41 | * |
| 42 | * The FBRA formats are not actually an instruction format. They are the |
| 43 | * "convenience directives" for branching on floating-point comparisons, |
| 44 | * each of which generates 2 instructions (a 'bno' and one other branch). |
| 45 | * |
| 46 | * The CALLJ format is not actually an instruction format. It indicates that |
| 47 | * the instruction generated (a CTRL-format 'call') should have its relocation |
| 48 | * specially flagged for link-time replacement with a 'bal' or 'calls' if |
| 49 | * appropriate. |
| 50 | */ |
| 51 | |
| 52 | /* tailor gas */ |
| 53 | #define LOCAL_LABELS_FB 1 |
| 54 | #define BITFIELD_CONS_EXPRESSIONS |
| 55 | |
| 56 | /* tailor the coff format */ |
| 57 | #define COFF_MAGIC I960ROMAGIC |
| 58 | #define OBJ_COFF_MAX_AUXENTRIES (2) |
| 59 | |
| 60 | /* MEANING OF 'n_other' in the symbol record. |
| 61 | * |
| 62 | * If non-zero, the 'n_other' fields indicates either a leaf procedure or |
| 63 | * a system procedure, as follows: |
| 64 | * |
| 65 | * 1 <= n_other <= 32 : |
| 66 | * The symbol is the entry point to a system procedure. |
| 67 | * 'n_value' is the address of the entry, as for any other |
| 68 | * procedure. The system procedure number (which can be used in |
| 69 | * a 'calls' instruction) is (n_other-1). These entries come from |
| 70 | * '.sysproc' directives. |
| 71 | * |
| 72 | * n_other == N_CALLNAME |
| 73 | * the symbol is the 'call' entry point to a leaf procedure. |
| 74 | * The *next* symbol in the symbol table must be the corresponding |
| 75 | * 'bal' entry point to the procedure (see following). These |
| 76 | * entries come from '.leafproc' directives in which two different |
| 77 | * symbols are specified (the first one is represented here). |
| 78 | * |
| 79 | * |
| 80 | * n_other == N_BALNAME |
| 81 | * the symbol is the 'bal' entry point to a leaf procedure. |
| 82 | * These entries result from '.leafproc' directives in which only |
| 83 | * one symbol is specified, or in which the same symbol is |
| 84 | * specified twice. |
| 85 | * |
| 86 | * Note that an N_CALLNAME entry *must* have a corresponding N_BALNAME entry, |
| 87 | * but not every N_BALNAME entry must have an N_CALLNAME entry. |
| 88 | */ |
| 89 | #define N_CALLNAME ((char)-1) |
| 90 | #define N_BALNAME ((char)-2) |
| 91 | |
| 92 | /* i960 uses a custom relocation record. */ |
| 93 | |
| 94 | /* let obj-aout.h know */ |
| 95 | #define CUSTOM_RELOC_FORMAT 1 |
| 96 | /* let aout_gnu.h know */ |
| 97 | #define N_RELOCATION_INFO_DECLARED 1 |
| 98 | struct relocation_info |
| 99 | { |
| 100 | int r_address; /* File address of item to be relocated */ |
| 101 | unsigned |
| 102 | r_index:24, /* Index of symbol on which relocation is based*/ |
| 103 | r_pcrel:1, /* 1 => relocate PC-relative; else absolute |
| 104 | * On i960, pc-relative implies 24-bit |
| 105 | * address, absolute implies 32-bit. |
| 106 | */ |
| 107 | r_length:2, /* Number of bytes to relocate: |
| 108 | * 0 => 1 byte |
| 109 | * 1 => 2 bytes |
| 110 | * 2 => 4 bytes -- only value used for i960 |
| 111 | */ |
| 112 | r_extern:1, r_bsr:1, /* Something for the GNU NS32K assembler */ |
| 113 | r_disp:1, /* Something for the GNU NS32K assembler */ |
| 114 | r_callj:1, /* 1 if relocation target is an i960 'callj' */ |
| 115 | nuthin:1; /* Unused */ |
| 116 | }; |
| 117 | |
| 118 | /* No shared lib support, so we don't need to ensure externally |
| 119 | visible symbols can be overridden. */ |
| 120 | #define EXTERN_FORCE_RELOC 0 |
| 121 | |
| 122 | /* Makes no sense to use the difference of 2 arbitrary symbols |
| 123 | as the target of a call instruction. */ |
| 124 | #define TC_FORCE_RELOCATION_SUB_SAME(FIX, SEG) \ |
| 125 | ((FIX)->fx_tcbit \ |
| 126 | || ! SEG_NORMAL (SEG) \ |
| 127 | || TC_FORCE_RELOCATION (FIX)) |
| 128 | |
| 129 | /* reloc_callj() may replace a 'call' with a 'calls' or a |
| 130 | 'bal', in which cases it modifies *fixP as appropriate. |
| 131 | In the case of a 'calls', no further work is required. */ |
| 132 | extern int reloc_callj (struct fix *); |
| 133 | |
| 134 | #define TC_FORCE_RELOCATION_ABS(FIX) \ |
| 135 | (TC_FORCE_RELOCATION (FIX) \ |
| 136 | || reloc_callj (FIX)) |
| 137 | |
| 138 | #define TC_FORCE_RELOCATION_LOCAL(FIX) \ |
| 139 | (!(FIX)->fx_pcrel \ |
| 140 | || TC_FORCE_RELOCATION (FIX) \ |
| 141 | || reloc_callj (FIX)) |
| 142 | |
| 143 | #ifdef OBJ_COFF |
| 144 | |
| 145 | /* We store the bal information in the sy_tc field. */ |
| 146 | #define TC_SYMFIELD_TYPE symbolS * |
| 147 | |
| 148 | #endif |
| 149 | |
| 150 | extern int i960_validate_fix (struct fix *, segT); |
| 151 | #define TC_VALIDATE_FIX(FIX,SEGTYPE,LABEL) \ |
| 152 | if (!i960_validate_fix (FIX, SEGTYPE)) goto LABEL |
| 153 | |
| 154 | #define tc_fix_adjustable(FIX) ((FIX)->fx_bsr == 0) |
| 155 | |
| 156 | #ifndef OBJ_ELF |
| 157 | /* Values passed to md_apply_fix sometimes include symbol values. */ |
| 158 | #define MD_APPLY_SYM_VALUE(FIX) tc_fix_adjustable (FIX) |
| 159 | #else |
| 160 | /* Values passed to md_apply_fix don't include the symbol value. */ |
| 161 | #define MD_APPLY_SYM_VALUE(FIX) 0 |
| 162 | #endif |
| 163 | |
| 164 | extern void brtab_emit (void); |
| 165 | #define md_end() brtab_emit () |
| 166 | |
| 167 | extern void tc_set_bal_of_call (symbolS *, symbolS *); |
| 168 | |
| 169 | extern struct symbol *tc_get_bal_of_call (symbolS *); |
| 170 | |
| 171 | extern void i960_handle_align (struct frag *); |
| 172 | #define HANDLE_ALIGN(FRAG) i960_handle_align (FRAG) |
| 173 | #define NO_RELOC -1 |
| 174 | |
| 175 | #define md_operand(x) |
| 176 | |
| 177 | extern const struct relax_type md_relax_table[]; |
| 178 | #define TC_GENERIC_RELAX_TABLE md_relax_table |
| 179 | |
| 180 | #define LINKER_RELAXING_SHRINKS_ONLY |
| 181 | |
| 182 | #define TC_FIX_TYPE struct { unsigned bsr : 1; } |
| 183 | #define fx_bsr tc_fix_data.bsr |
| 184 | #define TC_INIT_FIX_DATA(F) ((F)->tc_fix_data.bsr = 0) |
| 185 | |
| 186 | #endif |