78 lines
2.8 KiB
C
78 lines
2.8 KiB
C
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/* write.h -> write.c
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Copyright (C) 1987 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 1, 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,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public 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
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the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, 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 possibillity to mask in bits in the symbol
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when it's fixed in the objectcode 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 an some bitfield. ( ex: 5 bits in a short field of a opcode)
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*/
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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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/*
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* FixSs may be built up in any order.
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*/
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struct fix
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{
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fragS * fx_frag; /* Which frag? */
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long int fx_where; /* Where is the 1st byte to fix up? */
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symbolS * fx_addsy; /* NULL or Symbol whose value we add in. */
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symbolS * fx_subsy; /* NULL or Symbol whose value we subtract. */
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long int fx_offset; /* Absolute number we add in. */
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struct fix * fx_next; /* NULL or -> next fixS. */
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short int fx_size; /* How many bytes are involved? */
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char fx_pcrel; /* TRUE: pc-relative. */
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char fx_pcrel_adjust;/* pc-relative offset adjust */
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char fx_im_disp; /* TRUE: value is a displacement */
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bit_fixS * fx_bit_fixP; /* IF NULL no bitfix's to do */
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char fx_bsr; /* sequent-hack */
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#if defined(SPARC) || defined(I860)
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char fx_r_type; /* Sparc hacks */
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long fx_addnumber;
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#endif
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};
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typedef struct fix fixS;
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COMMON fixS * text_fix_root; /* Chains fixSs. */
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COMMON fixS * data_fix_root; /* Chains fixSs. */
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COMMON fixS ** seg_fix_rootP; /* -> one of above. */
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bit_fixS *bit_fix_new();
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/* end: write.h */
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