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annotate lwasm/os9.c @ 273:1409debcb1a0

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Fix crash on listing when nested noexpand macros are used Macros flagged noexpand were causing a segfault during listing. The problem was incorrect accounting for nesting levels for noexpand macros causing the listing handler to fall off the end of the program in certain circumstances and in other circumstances it would fail to suppress expansion. Both the segfault in the case of misbehaviour and the misbhaviour itself are corrected with this update. If you do not use nested noexpand macros, this bug has no effect.
author William Astle <lost@l-w.ca>
date Sat, 25 May 2013 13:35:46 -0600
parents 244f1227f2b5
children 8764142b3192
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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19
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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
150
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_error(as, l, "os9 directive only valid for OS9 target");
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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, "Bad operand");
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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_error(as, l, "mod directive only valid for OS9 target");
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74 skip_operand(p);
0
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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, "Already in a module!");
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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 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, "Bad operand");
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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 lwasm_register_error(as, l, "Bad operand");
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100 return;
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101 }
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102 (*p)++;
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103 }
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104
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105 e = lwasm_parse_expr(as, p);
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106 if (!e)
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107 {
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108 lwasm_register_error(as, l, "Bad operand");
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109 return;
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110 }
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111 lwasm_save_expr(l, 5, e);
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112
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113 l -> inmod = 1;
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114
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115 // we have an implicit ORG 0 with "mod"
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116 lw_expr_destroy(l -> addr);
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117 l -> addr = lw_expr_build(lw_expr_type_int, 0);
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118
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119 // likewise for data pointer
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120 lw_expr_destroy(l -> daddr);
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121 l -> daddr = lw_expr_build(lw_expr_type_int, 0);
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122
0
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123 // init crc
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124 as -> inmod = 1;
112
3fc568436721 Correct size handling for mod and emod
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125
3fc568436721 Correct size handling for mod and emod
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126 l -> len = 13;
0
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127 }
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128
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129 EMITFUNC(pseudo_emit_mod)
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130 {
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131 lw_expr_t e1, e2, e3, e4;
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132 int csum;
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133
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134 as -> crc[0] = 0xff;
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135 as -> crc[1] = 0xff;
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136 as -> crc[2] = 0xff;
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137
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138 // sync bytes
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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139 lwasm_emit(l, 0x87);
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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140 lwasm_emit(l, 0xcd);
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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141
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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142 // mod length
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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143 lwasm_emitexpr(l, e1 = lwasm_fetch_expr(l, 0), 2);
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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144
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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145 // name offset
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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146 lwasm_emitexpr(l, e2 = lwasm_fetch_expr(l, 1), 2);
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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147
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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148 // type
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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149 lwasm_emitexpr(l, e3 = lwasm_fetch_expr(l, 2), 1);
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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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 // flags/rev
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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152 lwasm_emitexpr(l, e4 = lwasm_fetch_expr(l, 3), 1);
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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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 // header check
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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155 csum = ~(0x87 ^ 0xCD ^(lw_expr_intval(e1) >> 8) ^ (lw_expr_intval(e1) & 0xff)
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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156 ^ (lw_expr_intval(e2) >> 8) ^ (lw_expr_intval(e2) & 0xff)
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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157 ^ lw_expr_intval(e3) ^ lw_expr_intval(e4));
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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158 lwasm_emit(l, csum);
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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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 // module type specific output
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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161 // note that these are handled the same for all so
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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162 // there need not be any special casing
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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163
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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164 // exec offset or fmgr name offset
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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165 lwasm_emitexpr(l, lwasm_fetch_expr(l, 4), 2);
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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166
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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167 // data size or drvr name offset
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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168 lwasm_emitexpr(l, lwasm_fetch_expr(l, 5), 2);
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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169 }
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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170
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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171 PARSEFUNC(pseudo_parse_emod)
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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172 {
144
86d097dceebc Make os9 directives not throw spurious bad operand errors
lost@l-w.ca
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diff changeset
173 skip_operand(p);
0
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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174 if (as -> output_format != OUTPUT_OS9)
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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175 {
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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176 lwasm_register_error(as, l, "emod directive only valid for OS9 target");
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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177 return;
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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178 }
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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179
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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180 if (!(as -> inmod))
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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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 lwasm_register_error(as, l, "not in a module!");
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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183 return;
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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184 }
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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185
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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186 as -> inmod = 0;
112
3fc568436721 Correct size handling for mod and emod
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187 l -> len = 3;
0
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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188 }
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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189
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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190 EMITFUNC(pseudo_emit_emod)
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 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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193
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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194 // don't mess with CRC!
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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195 tcrc[0] = as -> crc[0] ^ 0xff;
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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196 tcrc[1] = as -> crc[1] ^ 0xff;
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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197 tcrc[2] = as -> crc[2] ^ 0xff;
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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198 lwasm_emit(l, tcrc[0]);
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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199 lwasm_emit(l, tcrc[1]);
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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200 lwasm_emit(l, tcrc[2]);
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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201 }