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 187
