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annotate src/lwasm.c @ 31:674ee393426c

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Added handler for TFM instructions
author lost
date Fri, 02 Jan 2009 03:35:29 +0000
parents f736579569b4
children 9bd0fbfe7405
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1 /*
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2 lwasm.c
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3 Copyright © 2008 William Astle
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4
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5 This file is part of LWASM.
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6
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7 LWASM is free software: you can redistribute it and/or modify it under the
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8 terms of the GNU General Public License as published by the Free Software
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9 Foundation, either version 3 of the License, or (at your option) any later
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10 version.
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11
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12 This program is distributed in the hope that it will be useful, but WITHOUT
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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15 more details.
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16
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17 You should have received a copy of the GNU General Public License along with
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18 this program. If not, see <http://www.gnu.org/licenses/>.
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19
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20
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21 Contains random functions used by the assembler
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22 */
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23
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24 #define __lwasm_c_seen__
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25
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26 #include <stdarg.h>
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27 #include <stdlib.h>
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28 #include <stdio.h>
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29
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30 #include "lwasm.h"
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31 #include "util.h"
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32
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33 int register_error(asmstate_t *as, lwasm_line_t *l, int pass, const char *fmt, ...)
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34 {
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35 lwasm_error_t *e;
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36 va_list args;
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37 char errbuff[1024];
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38 int r;
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39
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40 if (as -> passnum != pass)
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41 return;
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42
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43 va_start(args, fmt);
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44
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45 e = lwasm_alloc(sizeof(lwasm_error_t));
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46
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47 e -> next = l -> err;
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48 l -> err = e;
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49
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50 as -> errorcount++;
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51
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52 r = vsnprintf(errbuff, 1024, fmt, args);
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53 e -> mess = lwasm_strdup(errbuff);
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54
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55 va_end(args);
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56
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57 return r;
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58 }
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59
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60 void lwasm_emit(asmstate_t *as, lwasm_line_t *l, int b)
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61 {
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62 as -> addr += 1;
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63
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64 if (as -> passnum == 1)
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65 return;
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66
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67 fprintf(stderr, "FIXME: trying to emit code in pass 2 but not implemented.\n");
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68 }
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69
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70 void lwasm_emitop(asmstate_t *as, lwasm_line_t *l, int o)
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71 {
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72 if (o >= 0x100)
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73 lwasm_emit(as, l, o >> 8);
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74 lwasm_emit(as, l, o & 0xff);
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75 }
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76
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77 int lwasm_lookupreg2(const char *reglist, char **str)
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78 {
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79 int rval = 0;
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80
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81 while (*reglist)
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82 {
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83 if (toupper(**str) == *reglist)
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84 {
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85 // first char matches
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86 if (reglist[1] == ' ' && !isalpha(*(*str + 1)))
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87 break;
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88 if (toupper(*(*str + 1)) == reglist[1])
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89 break;
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90 }
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91 reglist += 2;
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92 rval++;
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93 }
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94 if (!*reglist)
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95 return -1;
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96 if (reglist[1] == ' ')
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97 (*str)++;
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98 else
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99 (*str) += 2;
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100 return rval;
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101 }