| 1 | /* tc-i960.h - Basic 80960 instruction formats.
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| 2 | Copyright 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1997, 1998, 1999,
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| 3 | 2000, 2002, 2003
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| 4 | Free Software Foundation, Inc.
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| 5 |
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| 6 | This file is part of GAS, the GNU Assembler.
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| 7 |
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| 8 | GAS is free software; you can redistribute it and/or modify
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| 9 | it under the terms of the GNU General Public License as
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| 10 | published by the Free Software Foundation; either version 2,
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| 11 | or (at your option) any later version.
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| 12 |
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| 13 | GAS is distributed in the hope that it will be useful, but
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| 14 | WITHOUT ANY WARRANTY; without even the implied warranty of
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| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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| 16 | the GNU General Public License for more details.
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| 17 |
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| 18 | You should have received a copy of the GNU General Public License
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| 19 | along with GAS; see the file COPYING. If not, write to the Free
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| 20 | Software Foundation, 59 Temple Place - Suite 330, Boston, MA
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| 21 | 02111-1307, USA. */
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| 22 |
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| 23 | #ifndef TC_I960
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| 24 | #define TC_I960 1
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| 25 |
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| 26 | #ifdef OBJ_ELF
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| 27 | #define TARGET_FORMAT "elf32-i960"
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| 28 | #define TARGET_ARCH bfd_arch_i960
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| 29 | #endif
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| 30 |
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| 31 | #define TARGET_BYTES_BIG_ENDIAN 0
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| 32 |
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| 33 | #define WORKING_DOT_WORD
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| 34 |
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| 35 | /*
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| 36 | * The 'COJ' instructions are actually COBR instructions with the 'b' in
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| 37 | * the mnemonic replaced by a 'j'; they are ALWAYS "de-optimized" if necessary:
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| 38 | * if the displacement will not fit in 13 bits, the assembler will replace them
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| 39 | * with the corresponding compare and branch instructions.
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| 40 | *
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| 41 | * All of the 'MEMn' instructions are the same format; the 'n' in the name
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| 42 | * indicates the default index scale factor (the size of the datum operated on).
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| 43 | *
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| 44 | * The FBRA formats are not actually an instruction format. They are the
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| 45 | * "convenience directives" for branching on floating-point comparisons,
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| 46 | * each of which generates 2 instructions (a 'bno' and one other branch).
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| 47 | *
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| 48 | * The CALLJ format is not actually an instruction format. It indicates that
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| 49 | * the instruction generated (a CTRL-format 'call') should have its relocation
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| 50 | * specially flagged for link-time replacement with a 'bal' or 'calls' if
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| 51 | * appropriate.
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| 52 | */
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| 53 |
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| 54 | /* tailor gas */
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| 55 | #define SYMBOLS_NEED_BACKPOINTERS
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| 56 | #define LOCAL_LABELS_FB 1
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| 57 | #define BITFIELD_CONS_EXPRESSIONS
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| 58 |
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| 59 | /* tailor the coff format */
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| 60 | #define BFD_ARCH bfd_arch_i960
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| 61 | #define COFF_FLAGS F_AR32WR
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| 62 | #define COFF_MAGIC I960ROMAGIC
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| 63 | #define OBJ_COFF_SECTION_HEADER_HAS_ALIGNMENT
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| 64 | #define OBJ_COFF_MAX_AUXENTRIES (2)
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| 65 | #define TC_COUNT_RELOC(FIX) (!(FIX)->fx_done)
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| 66 | #define TC_COFF_FIX2RTYPE(FIX) tc_coff_fix2rtype (FIX)
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| 67 | #define TC_COFF_SIZEMACHDEP(FRAGP) tc_coff_sizemachdep (FRAGP)
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| 68 | #define TC_COFF_SET_MACHINE(HDRS) tc_headers_hook (HDRS)
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| 69 | extern int tc_coff_sizemachdep PARAMS ((struct frag *));
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| 70 |
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| 71 | /* MEANING OF 'n_other' in the symbol record.
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| 72 | *
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| 73 | * If non-zero, the 'n_other' fields indicates either a leaf procedure or
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| 74 | * a system procedure, as follows:
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| 75 | *
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| 76 | * 1 <= n_other <= 32 :
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| 77 | * The symbol is the entry point to a system procedure.
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| 78 | * 'n_value' is the address of the entry, as for any other
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| 79 | * procedure. The system procedure number (which can be used in
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| 80 | * a 'calls' instruction) is (n_other-1). These entries come from
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| 81 | * '.sysproc' directives.
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| 82 | *
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| 83 | * n_other == N_CALLNAME
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| 84 | * the symbol is the 'call' entry point to a leaf procedure.
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| 85 | * The *next* symbol in the symbol table must be the corresponding
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| 86 | * 'bal' entry point to the procedure (see following). These
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| 87 | * entries come from '.leafproc' directives in which two different
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| 88 | * symbols are specified (the first one is represented here).
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| 89 | *
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| 90 | *
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| 91 | * n_other == N_BALNAME
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| 92 | * the symbol is the 'bal' entry point to a leaf procedure.
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| 93 | * These entries result from '.leafproc' directives in which only
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| 94 | * one symbol is specified, or in which the same symbol is
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| 95 | * specified twice.
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| 96 | *
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| 97 | * Note that an N_CALLNAME entry *must* have a corresponding N_BALNAME entry,
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| 98 | * but not every N_BALNAME entry must have an N_CALLNAME entry.
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| 99 | */
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| 100 | #define N_CALLNAME ((char)-1)
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| 101 | #define N_BALNAME ((char)-2)
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| 102 |
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| 103 | /* i960 uses a custom relocation record. */
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| 104 |
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| 105 | /* let obj-aout.h know */
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| 106 | #define CUSTOM_RELOC_FORMAT 1
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| 107 | /* let aout_gnu.h know */
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| 108 | #define N_RELOCATION_INFO_DECLARED 1
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| 109 | struct relocation_info
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| 110 | {
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| 111 | int r_address; /* File address of item to be relocated */
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| 112 | unsigned
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| 113 | r_index:24, /* Index of symbol on which relocation is based*/
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| 114 | r_pcrel:1, /* 1 => relocate PC-relative; else absolute
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| 115 | * On i960, pc-relative implies 24-bit
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| 116 | * address, absolute implies 32-bit.
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| 117 | */
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| 118 | r_length:2, /* Number of bytes to relocate:
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| 119 | * 0 => 1 byte
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| 120 | * 1 => 2 bytes
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| 121 | * 2 => 4 bytes -- only value used for i960
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| 122 | */
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| 123 | r_extern:1, r_bsr:1, /* Something for the GNU NS32K assembler */
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| 124 | r_disp:1, /* Something for the GNU NS32K assembler */
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| 125 | r_callj:1, /* 1 if relocation target is an i960 'callj' */
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| 126 | nuthin:1; /* Unused */
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| 127 | };
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| 128 |
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| 129 | /* No shared lib support, so we don't need to ensure externally
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| 130 | visible symbols can be overridden. */
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| 131 | #define EXTERN_FORCE_RELOC 0
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| 132 |
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| 133 | /* Makes no sense to use the difference of 2 arbitrary symbols
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| 134 | as the target of a call instruction. */
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| 135 | #define TC_FORCE_RELOCATION_SUB_SAME(FIX, SEG) \
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| 136 | ((FIX)->fx_tcbit \
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| 137 | || ! SEG_NORMAL (SEG) \
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| 138 | || TC_FORCE_RELOCATION (FIX))
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| 139 |
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| 140 | /* reloc_callj() may replace a 'call' with a 'calls' or a
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| 141 | 'bal', in which cases it modifies *fixP as appropriate.
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| 142 | In the case of a 'calls', no further work is required. */
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| 143 | extern int reloc_callj PARAMS ((struct fix *));
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| 144 |
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| 145 | #define TC_FORCE_RELOCATION_ABS(FIX) \
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| 146 | (TC_FORCE_RELOCATION (FIX) \
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| 147 | || reloc_callj (FIX))
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| 148 |
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| 149 | #define TC_FORCE_RELOCATION_LOCAL(FIX) \
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| 150 | (!(FIX)->fx_pcrel \
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| 151 | || (FIX)->fx_plt \
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| 152 | || TC_FORCE_RELOCATION (FIX) \
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| 153 | || reloc_callj (FIX))
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| 154 |
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| 155 | #ifdef OBJ_COFF
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| 156 |
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| 157 | /* We store the bal information in the sy_tc field. */
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| 158 | #define TC_SYMFIELD_TYPE symbolS *
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| 159 |
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| 160 | #define TC_ADJUST_RELOC_COUNT(FIX,COUNT) \
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| 161 | { fixS *tcfixp = (FIX); \
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| 162 | for (;tcfixp;tcfixp=tcfixp->fx_next) \
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| 163 | if (tcfixp->fx_tcbit && tcfixp->fx_addsy != 0) \
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| 164 | ++(COUNT); \
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| 165 | }
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| 166 | #endif
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| 167 |
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| 168 | extern int i960_validate_fix PARAMS ((struct fix *, segT));
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| 169 | #define TC_VALIDATE_FIX(FIX,SEGTYPE,LABEL) \
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| 170 | if (!i960_validate_fix (FIX, SEGTYPE)) goto LABEL
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| 171 |
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| 172 | #define tc_fix_adjustable(FIX) ((FIX)->fx_bsr == 0)
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| 173 |
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| 174 | #ifndef OBJ_ELF
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| 175 | /* Values passed to md_apply_fix3 sometimes include symbol values. */
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| 176 | #define MD_APPLY_SYM_VALUE(FIX) tc_fix_adjustable (FIX)
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| 177 | #else
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| 178 | /* Values passed to md_apply_fix3 don't include the symbol value. */
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| 179 | #define MD_APPLY_SYM_VALUE(FIX) 0
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| 180 | #endif
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| 181 |
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| 182 | extern void brtab_emit PARAMS ((void));
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| 183 | #define md_end() brtab_emit ()
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| 184 |
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| 185 | extern void tc_set_bal_of_call PARAMS ((symbolS *, symbolS *));
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| 186 |
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| 187 | extern struct symbol *tc_get_bal_of_call PARAMS ((symbolS *));
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| 188 |
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| 189 | extern void i960_handle_align PARAMS ((struct frag *));
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| 190 | #define HANDLE_ALIGN(FRAG) i960_handle_align (FRAG)
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| 191 | #define NEED_FX_R_TYPE
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| 192 | #define NO_RELOC -1
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| 193 |
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| 194 | #define md_operand(x)
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| 195 |
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| 196 | extern const struct relax_type md_relax_table[];
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| 197 | #define TC_GENERIC_RELAX_TABLE md_relax_table
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| 198 |
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| 199 | #define LINKER_RELAXING_SHRINKS_ONLY
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| 200 |
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| 201 | #define TC_FIX_TYPE struct { unsigned bsr : 1; }
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| 202 | #define fx_bsr tc_fix_data.bsr
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| 203 | #define TC_INIT_FIX_DATA(F) ((F)->tc_fix_data.bsr = 0)
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| 204 |
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| 205 | #endif
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