fighting bitrot in a major way

1 files changed, 50 insertions, 0 deletions

diff --git a/gas/bit_fix.h b/gas/bit_fix.h
new file mode 100644
index 0000000..7936927
--- /dev/null
+++ b/gas/bit_fix.h
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+/* write.h
+
+   Copyright (C) 1987, 1992 Free Software Foundation, Inc.
+   
+   This file is part of GAS, the GNU Assembler.
+   
+   GAS is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2, or (at your option)
+   any later version.
+   
+   GAS is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+   
+   You should have received a copy of the GNU General Public License
+   along with GAS; see the file COPYING.  If not, write to
+   the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+/* The bit_fix was implemented to support machines that need variables
+   to be inserted in bitfields other than 1, 2 and 4 bytes. 
+   Furthermore it gives us a possibillity to mask in bits in the symbol
+   when it's fixed in the objectcode and check the symbols limits.
+   
+   The or-mask is used to set the huffman bits in displacements for the
+   ns32k port.
+   The acbi, addqi, movqi, cmpqi instruction requires an assembler that
+   can handle bitfields. Ie handle an expression, evaluate it and insert
+   the result in an some bitfield. ( ex: 5 bits in a short field of a opcode) 
+   */
+
+#ifndef __bit_fix_h__
+#define __bit_fix_h__
+
+struct bit_fix {
+	int fx_bit_size;	   /* Length of bitfield */
+	int fx_bit_offset;	   /* Bit offset to bitfield */
+	long fx_bit_base;	   /* Where do we apply the bitfix.
+				      If this is zero, default is assumed. */
+	long fx_bit_base_adj;	   /* Adjustment of base */
+	long fx_bit_max;	   /* Signextended max for bitfield */
+	long fx_bit_min;	   /* Signextended min for bitfield */
+	long fx_bit_add;	   /* Or mask, used for huffman prefix */
+};
+typedef struct bit_fix bit_fixS;
+
+#endif /* __bit_fix_h__ */
+
+ /* end of bit_fix.h */