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annotate lwasm/pass4.c @ 577:e49d24f4a9a5

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Correct bug in the object file output code leading to stack corruption It turns out leaving a pointer to a stack allocated temporary in a persistent data structure is not conducive to correct program operation. Undo the export check setup in the object file output sequence so a pointer to stack allocated memory is not left hanging when the function returns. This seems to correct at least one mysterious crash bug, and possibly others. Thanks to Boisy Pitre for reporting the crash bug that led to this discovery, as well as a previous crash bug that likely has the same root cause. Additional thanks to Ciaran Anscomb whose debugger wielding wizardry revealed the exact location of this particular bit of unbrilliance.
author William Astle <lost@l-w.ca>
date Sat, 03 Aug 2024 14:30:06 -0600
parents 8764142b3192
children
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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, E_INSTRUCTION_FAILED);
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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;
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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146 } while (rc > 0);
239
8beb109dfd69 Fix hang on undefined symbol in rmb under pragma undefextern
William Astle <lost@l-w.ca>
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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 {
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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154 do_pass4_aux(as, 1);
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155 }