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annotate lwasm/os9.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 dba08c7dff96
children
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0
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1 /*
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2 os9.c
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3 Copyright © 2009 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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20
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21 This file implements the various pseudo operations related to OS9 target
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22 */
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23 #include <errno.h>
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24 #include <stdio.h>
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25 #include <stdlib.h>
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26 #include <string.h>
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27
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28 #include <lw_expr.h>
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29
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30 #include "lwasm.h"
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31 #include "instab.h"
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32
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33
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34 // OS9 syscall
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35 PARSEFUNC(pseudo_parse_os9)
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36 {
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37 lw_expr_t e;
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38
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244f1227f2b5 Allow os9 directive in object target
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39 if (as -> output_format != OUTPUT_OS9 && as -> output_format != OUTPUT_OBJ)
0
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40 {
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41 lwasm_register_error2(as, l, E_DIRECTIVE_OS9_ONLY, "%s", "os9");
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42 return;
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43 }
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44
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45 // fetch immediate value
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46 e = lwasm_parse_expr(as, p);
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47 if (!e)
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48 {
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49 lwasm_register_error(as, l, E_OPERAND_BAD);
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50 return;
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51 }
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52 lwasm_save_expr(l, 0, e);
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53 l -> len = 3;
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54 }
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55
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56 EMITFUNC(pseudo_emit_os9)
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57 {
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58 lw_expr_t e;
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59
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60 e = lwasm_fetch_expr(l, 0);
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61
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62 lwasm_emitop(l, 0x103f);
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63 lwasm_emitexpr(l, e, 1);
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64 }
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65
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66 PARSEFUNC(pseudo_parse_mod)
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67 {
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68 lw_expr_t e;
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69 int i;
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70
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71 if (as -> output_format != OUTPUT_OS9)
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72 {
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73 lwasm_register_error2(as, l, E_DIRECTIVE_OS9_ONLY, "%s", "mod");
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74 skip_operand(p);
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75 return;
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76 }
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77
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78 if (as -> inmod)
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79 {
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80 lwasm_register_error(as, l, E_MODULE_IN);
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81 skip_operand(p);
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82 return;
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83 }
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84
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85 // parse 6 (or 4) expressions...
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86 for (i = 0; i < 5; i++)
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87 {
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88 e = lwasm_parse_expr(as, p);
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89 if (!e)
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90 {
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91 lwasm_register_error(as, l, E_OPERAND_BAD);
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92 return;
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93 }
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94
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95 lwasm_save_expr(l, i, e);
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96
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97 if (**p != ',')
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98 {
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99 if (i == 3)
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100 {
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101 // we don't have the extra items; flag it and don't bother
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102 // with them later; goto is to short circuit the rest of
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103 // the expression parsing
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104 l -> lint = 4;
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105 goto doneexpr;
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106 }
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107 lwasm_register_error(as, l, E_OPERAND_BAD);
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108 return;
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109 }
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110 (*p)++;
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111 }
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112 e = lwasm_parse_expr(as, p);
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113 if (!e)
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114 {
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115 lwasm_register_error(as, l, E_OPERAND_BAD);
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116 return;
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117 }
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118 lwasm_save_expr(l, 5, e);
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119 l -> lint = 6;
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120
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121 doneexpr:
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122 l -> inmod = 1;
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123
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124 // we have an implicit ORG 0 with "mod"
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125 lw_expr_destroy(l -> addr);
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126 l -> addr = lw_expr_build(lw_expr_type_int, 0);
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127
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128 // likewise for data pointer
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129 lw_expr_destroy(l -> daddr);
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130 l -> daddr = lw_expr_build(lw_expr_type_int, 0);
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131
0
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132 // init crc
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133 as -> inmod = 1;
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134
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135 l -> len = (l -> lint == 6) ? 13 : 9;
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136 }
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137
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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138 EMITFUNC(pseudo_emit_mod)
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139 {
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140 lw_expr_t e1, e2, e3, e4;
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141 int csum;
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142
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143 as -> crc[0] = 0xff;
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144 as -> crc[1] = 0xff;
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145 as -> crc[2] = 0xff;
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146
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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147 // sync bytes
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148 lwasm_emit(l, 0x87);
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149 lwasm_emit(l, 0xcd);
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150
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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151 // mod length
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152 lwasm_emitexpr(l, e1 = lwasm_fetch_expr(l, 0), 2);
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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 // name offset
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155 lwasm_emitexpr(l, e2 = lwasm_fetch_expr(l, 1), 2);
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156
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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157 // type
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158 lwasm_emitexpr(l, e3 = lwasm_fetch_expr(l, 2), 1);
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159
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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160 // flags/rev
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161 lwasm_emitexpr(l, e4 = lwasm_fetch_expr(l, 3), 1);
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162
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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163 // header check
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164 csum = ~(0x87 ^ 0xCD ^(lw_expr_intval(e1) >> 8) ^ (lw_expr_intval(e1) & 0xff)
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165 ^ (lw_expr_intval(e2) >> 8) ^ (lw_expr_intval(e2) & 0xff)
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166 ^ lw_expr_intval(e3) ^ lw_expr_intval(e4));
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167 lwasm_emit(l, csum);
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168
556
928c033c0cd0 Allow MOD directive to accept only the standard base header parameters
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169 if (l -> lint == 6)
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170 {
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171 // module type specific output, if provided
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172 // note that these are handled the same for all so
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173 // there need not be any special casing
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174
928c033c0cd0 Allow MOD directive to accept only the standard base header parameters
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175 // exec offset or fmgr name offset
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176 lwasm_emitexpr(l, lwasm_fetch_expr(l, 4), 2);
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177
928c033c0cd0 Allow MOD directive to accept only the standard base header parameters
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178 // data size or drvr name offset
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179 lwasm_emitexpr(l, lwasm_fetch_expr(l, 5), 2);
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parents: 370
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180 }
0
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181 }
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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182
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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183 PARSEFUNC(pseudo_parse_emod)
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184 {
144
86d097dceebc Make os9 directives not throw spurious bad operand errors
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diff changeset
185 skip_operand(p);
0
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186 if (as -> output_format != OUTPUT_OS9)
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187 {
370
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diff changeset
188 lwasm_register_error2(as, l, E_DIRECTIVE_OS9_ONLY, "%s", "emod");
0
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189 return;
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190 }
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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191
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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192 if (!(as -> inmod))
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193 {
370
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diff changeset
194 lwasm_register_error(as, l, E_MODULE_NOTIN);
0
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195 return;
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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196 }
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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197
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198 as -> inmod = 0;
112
3fc568436721 Correct size handling for mod and emod
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diff changeset
199 l -> len = 3;
0
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200 }
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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201
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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202 EMITFUNC(pseudo_emit_emod)
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203 {
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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204 unsigned char tcrc[3];
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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205
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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206 // don't mess with CRC!
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207 tcrc[0] = as -> crc[0] ^ 0xff;
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208 tcrc[1] = as -> crc[1] ^ 0xff;
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209 tcrc[2] = as -> crc[2] ^ 0xff;
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210 lwasm_emit(l, tcrc[0]);
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211 lwasm_emit(l, tcrc[1]);
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212 lwasm_emit(l, tcrc[2]);
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213 }