1/* tc-i960.h - Basic 80960 instruction formats. 2 Copyright 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1997, 1998, 1999, 3 2000, 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, 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(FIX) (!(FIX)->fx_done) 66#define TC_COFF_FIX2RTYPE(FIX) tc_coff_fix2rtype (FIX) 67#define TC_COFF_SIZEMACHDEP(FRAGP) tc_coff_sizemachdep (FRAGP) 68#define TC_COFF_SET_MACHINE(HDRS) tc_headers_hook (HDRS) 69extern int tc_coff_sizemachdep PARAMS ((struct frag *)); 70 71/* MEANING OF 'n_other' in the symbol record. 72 * 73 * If non-zero, the 'n_other' fields indicates either a leaf procedure or 74 * a system procedure, as follows: 75 * 76 * 1 <= n_other <= 32 : 77 * The symbol is the entry point to a system procedure. 78 * 'n_value' is the address of the entry, as for any other 79 * procedure. The system procedure number (which can be used in 80 * a 'calls' instruction) is (n_other-1). These entries come from 81 * '.sysproc' directives. 82 * 83 * n_other == N_CALLNAME 84 * the symbol is the 'call' entry point to a leaf procedure. 85 * The *next* symbol in the symbol table must be the corresponding 86 * 'bal' entry point to the procedure (see following). These 87 * entries come from '.leafproc' directives in which two different 88 * symbols are specified (the first one is represented here). 89 * 90 * 91 * n_other == N_BALNAME 92 * the symbol is the 'bal' entry point to a leaf procedure. 93 * These entries result from '.leafproc' directives in which only 94 * one symbol is specified, or in which the same symbol is 95 * specified twice. 96 * 97 * Note that an N_CALLNAME entry *must* have a corresponding N_BALNAME entry, 98 * but not every N_BALNAME entry must have an N_CALLNAME entry. 99 */ 100#define N_CALLNAME ((char)-1) 101#define N_BALNAME ((char)-2) 102 103/* i960 uses a custom relocation record. */ 104 105/* let obj-aout.h know */ 106#define CUSTOM_RELOC_FORMAT 1 107/* let aout_gnu.h know */ 108#define N_RELOCATION_INFO_DECLARED 1 109struct relocation_info 110 { 111 int r_address; /* File address of item to be relocated */ 112 unsigned 113 r_index:24, /* Index of symbol on which relocation is based*/ 114 r_pcrel:1, /* 1 => relocate PC-relative; else absolute 115 * On i960, pc-relative implies 24-bit 116 * address, absolute implies 32-bit. 117 */ 118 r_length:2, /* Number of bytes to relocate: 119 * 0 => 1 byte 120 * 1 => 2 bytes 121 * 2 => 4 bytes -- only value used for i960 122 */ 123 r_extern:1, r_bsr:1, /* Something for the GNU NS32K assembler */ 124 r_disp:1, /* Something for the GNU NS32K assembler */ 125 r_callj:1, /* 1 if relocation target is an i960 'callj' */ 126 nuthin:1; /* Unused */ 127 }; 128 129/* No shared lib support, so we don't need to ensure externally 130 visible symbols can be overridden. */ 131#define EXTERN_FORCE_RELOC 0 132 133/* Makes no sense to use the difference of 2 arbitrary symbols 134 as the target of a call instruction. */ 135#define TC_FORCE_RELOCATION_SUB_SAME(FIX, SEG) \ 136 ((FIX)->fx_tcbit \ 137 || ! SEG_NORMAL (SEG) \ 138 || TC_FORCE_RELOCATION (FIX)) 139 140/* reloc_callj() may replace a 'call' with a 'calls' or a 141 'bal', in which cases it modifies *fixP as appropriate. 142 In the case of a 'calls', no further work is required. */ 143extern int reloc_callj PARAMS ((struct fix *)); 144 145#define TC_FORCE_RELOCATION_ABS(FIX) \ 146 (TC_FORCE_RELOCATION (FIX) \ 147 || reloc_callj (FIX)) 148 149#define TC_FORCE_RELOCATION_LOCAL(FIX) \ 150 (!(FIX)->fx_pcrel \ 151 || (FIX)->fx_plt \ 152 || TC_FORCE_RELOCATION (FIX) \ 153 || reloc_callj (FIX)) 154 155#ifdef OBJ_COFF 156 157/* We store the bal information in the sy_tc field. */ 158#define TC_SYMFIELD_TYPE symbolS * 159 160#define TC_ADJUST_RELOC_COUNT(FIX,COUNT) \ 161 { fixS *tcfixp = (FIX); \ 162 for (;tcfixp;tcfixp=tcfixp->fx_next) \ 163 if (tcfixp->fx_tcbit && tcfixp->fx_addsy != 0) \ 164 ++(COUNT); \ 165 } 166#endif 167 168extern int i960_validate_fix PARAMS ((struct fix *, segT)); 169#define TC_VALIDATE_FIX(FIX,SEGTYPE,LABEL) \ 170 if (!i960_validate_fix (FIX, SEGTYPE)) goto LABEL 171 172#define tc_fix_adjustable(FIX) ((FIX)->fx_bsr == 0) 173 174#ifndef OBJ_ELF 175/* Values passed to md_apply_fix3 sometimes include symbol values. */ 176#define MD_APPLY_SYM_VALUE(FIX) tc_fix_adjustable (FIX) 177#else 178/* Values passed to md_apply_fix3 don't include the symbol value. */ 179#define MD_APPLY_SYM_VALUE(FIX) 0 180#endif 181 182extern void brtab_emit PARAMS ((void)); 183#define md_end() brtab_emit () 184 185extern void tc_set_bal_of_call PARAMS ((symbolS *, symbolS *)); 186 187extern struct symbol *tc_get_bal_of_call PARAMS ((symbolS *)); 188 189extern void i960_handle_align PARAMS ((struct frag *)); 190#define HANDLE_ALIGN(FRAG) i960_handle_align (FRAG) 191#define NEED_FX_R_TYPE 192#define NO_RELOC -1 193 194#define md_operand(x) 195 196extern const struct relax_type md_relax_table[]; 197#define TC_GENERIC_RELAX_TABLE md_relax_table 198 199#define LINKER_RELAXING_SHRINKS_ONLY 200 201#define TC_FIX_TYPE struct { unsigned bsr : 1; } 202#define fx_bsr tc_fix_data.bsr 203#define TC_INIT_FIX_DATA(F) ((F)->tc_fix_data.bsr = 0) 204 205#endif 206