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48 lines
1.9 KiB
C
48 lines
1.9 KiB
C
/* bit_fix.h
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Copyright (C) 1987-2020 Free Software Foundation, Inc.
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This file is part of GAS, the GNU Assembler.
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GAS is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3, or (at your option)
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any later version.
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GAS is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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License for more details.
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You should have received a copy of the GNU General Public License
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along with GAS; see the file COPYING. If not, write to the Free
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Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
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02110-1301, USA. */
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/* The bit_fix was implemented to support machines that need variables
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to be inserted in bitfields other than 1, 2 and 4 bytes.
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Furthermore it gives us a possibility to mask in bits in the symbol
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when it's fixed in the object code and check the symbols limits.
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The or-mask is used to set the huffman bits in displacements for the
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ns32k port.
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The acbi, addqi, movqi, cmpqi instruction requires an assembler that
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can handle bitfields. Ie. handle an expression, evaluate it and insert
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the result in some bitfield. (eg: 5 bits in a short field of an opcode). */
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#ifndef __bit_fix_h__
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#define __bit_fix_h__
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struct bit_fix {
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int fx_bit_size; /* Length of bitfield */
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int fx_bit_offset; /* Bit offset to bitfield */
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long fx_bit_base; /* Where do we apply the bitfix.
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If this is zero, default is assumed. */
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long fx_bit_base_adj; /* Adjustment of base */
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long fx_bit_max; /* Signextended max for bitfield */
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long fx_bit_min; /* Signextended min for bitfield */
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long fx_bit_add; /* Or mask, used for huffman prefix */
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};
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typedef struct bit_fix bit_fixS;
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#endif /* __bit_fix_h__ */
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