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5222 | serge | 1 | /* bit_fix.h |
6324 | serge | 2 | Copyright (C) 1987-2015 Free Software Foundation, Inc. |
5222 | serge | 3 | |
4 | This file is part of GAS, the GNU Assembler. |
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5 | |||
6 | GAS is free software; you can redistribute it and/or modify |
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7 | it under the terms of the GNU General Public License as published by |
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8 | the Free Software Foundation; either version 3, or (at your option) |
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9 | any later version. |
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10 | |||
11 | GAS is distributed in the hope that it will be useful, but WITHOUT |
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12 | ANY WARRANTY; without even the implied warranty of MERCHANTABILITY |
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13 | or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public |
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14 | License for more details. |
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15 | |||
16 | You should have received a copy of the GNU General Public License |
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17 | along with GAS; see the file COPYING. If not, write to the Free |
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18 | Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA |
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19 | 02110-1301, USA. */ |
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20 | |||
21 | /* The bit_fix was implemented to support machines that need variables |
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22 | to be inserted in bitfields other than 1, 2 and 4 bytes. |
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23 | Furthermore it gives us a possibility to mask in bits in the symbol |
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24 | when it's fixed in the objectcode and check the symbols limits. |
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25 | |||
26 | The or-mask is used to set the huffman bits in displacements for the |
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27 | ns32k port. |
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28 | The acbi, addqi, movqi, cmpqi instruction requires an assembler that |
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29 | can handle bitfields. Ie. handle an expression, evaluate it and insert |
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30 | the result in some bitfield. (eg: 5 bits in a short field of an opcode). */ |
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31 | |||
32 | #ifndef __bit_fix_h__ |
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33 | #define __bit_fix_h__ |
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34 | |||
35 | struct bit_fix { |
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36 | int fx_bit_size; /* Length of bitfield */ |
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37 | int fx_bit_offset; /* Bit offset to bitfield */ |
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38 | long fx_bit_base; /* Where do we apply the bitfix. |
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39 | If this is zero, default is assumed. */ |
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40 | long fx_bit_base_adj; /* Adjustment of base */ |
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41 | long fx_bit_max; /* Signextended max for bitfield */ |
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42 | long fx_bit_min; /* Signextended min for bitfield */ |
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43 | long fx_bit_add; /* Or mask, used for huffman prefix */ |
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44 | }; |
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45 | typedef struct bit_fix bit_fixS; |
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46 | |||
47 | #endif /* __bit_fix_h__ */ |