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 196