projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 425dcb5d C |
1 | /* write.h -> write.c |
| 2 | Copyright (C) 1987 Free Software Foundation, Inc. | |
| 3 | ||
| 4 | This file is part of GAS, the GNU Assembler. | |
| 5 | ||
| 6 | GAS is free software; you can redistribute it and/or modify | |
| 7 | it under the terms of the GNU General Public License as published by | |
| 8 | the Free Software Foundation; either version 1, or (at your option) | |
| 9 | any later version. | |
| 10 | ||
| 11 | GAS is distributed in the hope that it will be useful, | |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 14 | GNU General Public License for more details. | |
| 15 | ||
| 16 | You should have received a copy of the GNU General Public License | |
| 17 | along with GAS; see the file COPYING. If not, write to | |
| 18 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
| 19 | ||
| 20 | /* The bit_fix was implemented to support machines that need variables | |
| 21 | to be inserted in bitfields other than 1, 2 and 4 bytes. | |
| 22 | Furthermore it gives us a possibillity to mask in bits in the symbol | |
| 23 | when it's fixed in the objectcode and check the symbols limits. | |
| 24 | ||
| 25 | The or-mask is used to set the huffman bits in displacements for the | |
| 26 | ns32k port. | |
| 27 | The acbi, addqi, movqi, cmpqi instruction requires an assembler that | |
| 28 | can handle bitfields. Ie handle an expression, evaluate it and insert | |
| 29 | the result in an some bitfield. ( ex: 5 bits in a short field of a opcode) | |
| 30 | */ | |
| 31 | ||
| 32 | ||
| 33 | struct bit_fix { | |
| 34 | int fx_bit_size; /* Length of bitfield */ | |
| 35 | int fx_bit_offset; /* Bit offset to bitfield */ | |
| 36 | long fx_bit_base; /* Where do we apply the bitfix. | |
| 37 | If this is zero, default is assumed. */ | |
| 38 | long fx_bit_base_adj;/* Adjustment of base */ | |
| 39 | long fx_bit_max; /* Signextended max for bitfield */ | |
| 40 | long fx_bit_min; /* Signextended min for bitfield */ | |
| 41 | long fx_bit_add; /* Or mask, used for huffman prefix */ | |
| 42 | }; | |
| 43 | typedef struct bit_fix bit_fixS; | |
| 44 | /* | |
| 45 | * FixSs may be built up in any order. | |
| 46 | */ | |
| 47 | ||
| 48 | struct fix | |
| 49 | { | |
| 50 | fragS * fx_frag; /* Which frag? */ | |
| 51 | long int fx_where; /* Where is the 1st byte to fix up? */ | |
| 52 | symbolS * fx_addsy; /* NULL or Symbol whose value we add in. */ | |
| 53 | symbolS * fx_subsy; /* NULL or Symbol whose value we subtract. */ | |
| 54 | long int fx_offset; /* Absolute number we add in. */ | |
| 55 | struct fix * fx_next; /* NULL or -> next fixS. */ | |
| 56 | short int fx_size; /* How many bytes are involved? */ | |
| 57 | char fx_pcrel; /* TRUE: pc-relative. */ | |
| 58 | char fx_pcrel_adjust;/* pc-relative offset adjust */ | |
| 59 | char fx_im_disp; /* TRUE: value is a displacement */ | |
| 60 | bit_fixS * fx_bit_fixP; /* IF NULL no bitfix's to do */ | |
| 61 | char fx_bsr; /* sequent-hack */ | |
| 62 | #if defined(SPARC) || defined(I860) | |
| 63 | char fx_r_type; /* Sparc hacks */ | |
| 64 | long fx_addnumber; | |
| 65 | #endif | |
| 66 | }; | |
| 67 | ||
| 68 | typedef struct fix fixS; | |
| 69 | ||
| 70 | ||
| 71 | COMMON fixS * text_fix_root; /* Chains fixSs. */ | |
| 72 | COMMON fixS * data_fix_root; /* Chains fixSs. */ | |
| 73 | COMMON fixS ** seg_fix_rootP; /* -> one of above. */ | |
| 74 | ||
| 75 | bit_fixS *bit_fix_new(); | |
| 76 | /* end: write.h */ | |
| 77 |