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Updated lwcc README with info on the runtime support files Added description of -B and the runtime support files required for the lwcc program.
author William Astle <lost@l-w.ca>
date Sun, 08 Sep 2013 16:55:59 -0600
parents 8beb109dfd69
children 8764142b3192
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0
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1 /*
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2 pass4.c
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3
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4 Copyright © 2010 William Astle
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5
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6 This file is part of LWTOOLS.
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7
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8 LWTOOLS is free software: you can redistribute it and/or modify it under the
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9 terms of the GNU General Public License as published by the Free Software
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10 Foundation, either version 3 of the License, or (at your option) any later
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11 version.
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12
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13 This program is distributed in the hope that it will be useful, but WITHOUT
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14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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16 more details.
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17
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18 You should have received a copy of the GNU General Public License along with
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19 this program. If not, see <http://www.gnu.org/licenses/>.
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20 */
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21
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22 #include <stdio.h>
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23 #include <string.h>
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24
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25 #include <lw_alloc.h>
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26 #include <lw_string.h>
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27
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28 #include "lwasm.h"
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29 #include "instab.h"
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30
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31 /*
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32 Resolve2 Pass
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33
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34 Force resolution of instruction sizes.
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35
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36 */
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37 void do_pass4_aux(asmstate_t *as, int force)
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38 {
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39 int rc;
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40 int cnt;
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41 line_t *cl, *sl;
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42 struct line_expr_s *le;
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43 int trycount = 0;
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44
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45 // first, count the number of unresolved instructions
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46 for (cnt = 0, cl = as -> line_head; cl; cl = cl -> next)
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47 {
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48 if (cl -> len == -1)
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49 cnt++;
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50 }
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51
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52 sl = as -> line_head;
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53 while (cnt > 0)
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54 {
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55 trycount = cnt;
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56 debug_message(as, 60, "%d unresolved instructions", cnt);
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57
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58 // find an unresolved instruction
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59 for ( ; sl && sl -> len != -1; sl = sl -> next)
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60 {
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61 debug_message(as, 200, "Search line %p", sl);
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62 as -> cl = sl;
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63 lwasm_reduce_expr(as, sl -> addr);
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64 lwasm_reduce_expr(as, sl -> daddr);
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65
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66 // simplify each expression
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67 for (le = sl -> exprs; le; le = le -> next)
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68 lwasm_reduce_expr(as, le -> expr);
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69 }
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71 debug_message(as, 200, "Found line %p", sl);
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72 // simplify address
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73 as -> cl = sl;
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74 lwasm_reduce_expr(as, sl -> addr);
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75 lwasm_reduce_expr(as, sl -> daddr);
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76
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77 // simplify each expression
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78 for (le = sl -> exprs; le; le = le -> next)
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79 lwasm_reduce_expr(as, le -> expr);
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80
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81
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82 if (sl -> len == -1 && sl -> insn >= 0 && instab[sl -> insn].resolve)
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83 {
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84 (instab[sl -> insn].resolve)(as, sl, 1);
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85 debug_message(as, 200, "Try resolve = %d/%d", sl -> len, sl -> dlen);
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86 if (force && sl -> len == -1 && sl -> dlen == -1)
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87 {
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88 lwasm_register_error(as, sl, "Instruction failed to resolve.");
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89 return;
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90 }
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91 }
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92 if (sl -> len != -1 && sl -> dlen != -1)
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93 {
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94 cnt--;
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95 if (cnt == 0)
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96 return;
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97
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98 // this one resolved - try looking for the next one instead
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99 // of wasting time running through the rest of the lines
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100 continue;
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101 }
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102
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103 do
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104 {
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105 debug_message(as, 200, "Flatten after...");
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106 rc = 0;
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107 for (cl = sl; cl; cl = cl -> next)
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108 {
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109 debug_message(as, 200, "Flatten line %p", cl);
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110 as -> cl = cl;
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111
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112 // simplify address
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113 lwasm_reduce_expr(as, cl -> addr);
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114 lwasm_reduce_expr(as, cl -> daddr);
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115 // simplify each expression
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116 for (le = cl -> exprs; le; le = le -> next)
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117 lwasm_reduce_expr(as, le -> expr);
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118
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119 if (cl -> len == -1)
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120 {
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121 // try resolving the instruction length
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122 // but don't force resolution
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123 if (cl -> insn >= 0 && instab[cl -> insn].resolve)
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124 {
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125 (instab[cl -> insn].resolve)(as, cl, 0);
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126 if ((cl -> inmod == 0) && cl -> len >= 0 && cl -> dlen >= 0)
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127 {
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128 if (cl -> len == 0)
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129 cl -> len = cl -> dlen;
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130 else
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131 cl -> dlen = cl -> len;
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132 }
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133 debug_message(as, 200, "Flatten resolve returns %d", cl -> len);
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134 if (cl -> len != -1 && cl -> dlen != -1)
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135 {
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136 rc++;
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137 cnt--;
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138 if (cnt == 0)
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139 return;
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140 }
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141 }
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142 }
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143 }
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144 if (as -> errorcount > 0)
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145 return;
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146 } while (rc > 0);
239
8beb109dfd69 Fix hang on undefined symbol in rmb under pragma undefextern
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147 if (trycount == cnt)
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148 break;
0
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149 }
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150 }
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151
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152 void do_pass4(asmstate_t *as)
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153 {
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154 do_pass4_aux(as, 1);
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155 }