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10554
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1 /* ----------------------------------------------------------------------- *
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2 *
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3 * Copyright 1996-2017 The NASM Authors - All Rights Reserved
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4 * See the file AUTHORS included with the NASM distribution for
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5 * the specific copyright holders.
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6 *
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7 * Redistribution and use in source and binary forms, with or without
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8 * modification, are permitted provided that the following
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9 * conditions are met:
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10 *
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11 * * Redistributions of source code must retain the above copyright
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12 * notice, this list of conditions and the following disclaimer.
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13 * * Redistributions in binary form must reproduce the above
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14 * copyright notice, this list of conditions and the following
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15 * disclaimer in the documentation and/or other materials provided
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16 * with the distribution.
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17 *
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18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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19 * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
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20 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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21 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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22 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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23 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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24 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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26 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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29 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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30 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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31 *
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32 * ----------------------------------------------------------------------- */
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33
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34 /*
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35 * Parse and handle assembler directives
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36 */
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37
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38 #include "compiler.h"
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39
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40 #include <stdlib.h>
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41 #include <string.h>
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42 #include <ctype.h>
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43 #include <limits.h>
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44
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45 #include "nasm.h"
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46 #include "nasmlib.h"
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47 #include "error.h"
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48 #include "float.h"
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49 #include "stdscan.h"
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50 #include "preproc.h"
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51 #include "eval.h"
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52 #include "assemble.h"
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53 #include "outform.h"
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54 #include "listing.h"
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55 #include "labels.h"
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56 #include "iflag.h"
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57
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58 static iflag_t get_cpu(char *value)
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59 {
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60 iflag_t r;
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61
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62 iflag_clear_all(&r);
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63
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64 if (!strcmp(value, "8086"))
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65 iflag_set(&r, IF_8086);
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66 else if (!strcmp(value, "186"))
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67 iflag_set(&r, IF_186);
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68 else if (!strcmp(value, "286"))
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69 iflag_set(&r, IF_286);
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70 else if (!strcmp(value, "386"))
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71 iflag_set(&r, IF_386);
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72 else if (!strcmp(value, "486"))
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73 iflag_set(&r, IF_486);
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74 else if (!strcmp(value, "586") ||
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75 !nasm_stricmp(value, "pentium"))
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76 iflag_set(&r, IF_PENT);
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77 else if (!strcmp(value, "686") ||
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78 !nasm_stricmp(value, "ppro") ||
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79 !nasm_stricmp(value, "pentiumpro") ||
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80 !nasm_stricmp(value, "p2"))
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81 iflag_set(&r, IF_P6);
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82 else if (!nasm_stricmp(value, "p3") ||
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83 !nasm_stricmp(value, "katmai"))
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84 iflag_set(&r, IF_KATMAI);
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85 else if (!nasm_stricmp(value, "p4") || /* is this right? -- jrc */
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86 !nasm_stricmp(value, "willamette"))
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87 iflag_set(&r, IF_WILLAMETTE);
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88 else if (!nasm_stricmp(value, "prescott"))
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89 iflag_set(&r, IF_PRESCOTT);
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90 else if (!nasm_stricmp(value, "x64") ||
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91 !nasm_stricmp(value, "x86-64"))
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92 iflag_set(&r, IF_X86_64);
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93 else if (!nasm_stricmp(value, "ia64") ||
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94 !nasm_stricmp(value, "ia-64") ||
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95 !nasm_stricmp(value, "itanium")||
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96 !nasm_stricmp(value, "itanic") ||
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97 !nasm_stricmp(value, "merced"))
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98 iflag_set(&r, IF_IA64);
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99 else {
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100 iflag_set(&r, IF_PLEVEL);
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101 nasm_error(pass0 < 2 ? ERR_NONFATAL : ERR_FATAL,
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102 "unknown 'cpu' type");
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103 }
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104 return r;
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105 }
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106
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107 static int get_bits(char *value)
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108 {
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109 int i;
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110
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111 if ((i = atoi(value)) == 16)
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112 return i; /* set for a 16-bit segment */
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113 else if (i == 32) {
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114 if (iflag_ffs(&cpu) < IF_386) {
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115 nasm_error(ERR_NONFATAL,
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116 "cannot specify 32-bit segment on processor below a 386");
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117 i = 16;
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118 }
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119 } else if (i == 64) {
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120 if (iflag_ffs(&cpu) < IF_X86_64) {
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121 nasm_error(ERR_NONFATAL,
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122 "cannot specify 64-bit segment on processor below an x86-64");
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123 i = 16;
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124 }
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125 } else {
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126 nasm_error(pass0 < 2 ? ERR_NONFATAL : ERR_FATAL,
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127 "`%s' is not a valid segment size; must be 16, 32 or 64",
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128 value);
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129 i = 16;
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130 }
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131 return i;
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132 }
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133
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134 static enum directives parse_directive_line(char **directive, char **value)
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135 {
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136 char *p, *q, *buf;
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137
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138 buf = nasm_skip_spaces(*directive);
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139
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140 /*
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141 * It should be enclosed in [ ].
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142 * XXX: we don't check there is nothing else on the remainder of the
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143 * line, except a possible comment.
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144 */
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145 if (*buf != '[')
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146 return D_none;
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147 q = strchr(buf, ']');
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148 if (!q)
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149 return D_corrupt;
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150
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151 /*
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152 * Strip off the comments. XXX: this doesn't account for quoted
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153 * strings inside a directive. We should really strip the
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154 * comments in generic code, not here. While we're at it, it
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155 * would be better to pass the backend a series of tokens instead
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156 * of a raw string, and actually process quoted strings for it,
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157 * like of like argv is handled in C.
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158 */
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159 p = strchr(buf, ';');
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160 if (p) {
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161 if (p < q) /* ouch! somewhere inside */
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162 return D_corrupt;
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163 *p = '\0';
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164 }
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165
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166 /* no brace, no trailing spaces */
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167 *q = '\0';
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168 nasm_zap_spaces_rev(--q);
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169
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170 /* directive */
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171 p = nasm_skip_spaces(++buf);
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172 q = nasm_skip_word(p);
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173 if (!q)
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174 return D_corrupt; /* sigh... no value there */
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175 *q = '\0';
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176 *directive = p;
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177
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178 /* and value finally */
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179 p = nasm_skip_spaces(++q);
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180 *value = p;
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181
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182 return find_directive(*directive);
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183 }
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184
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185 /*
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186 * Process a line from the assembler and try to handle it if it
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187 * is a directive. Return true if the line was handled (including
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188 * if it was an error), false otherwise.
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189 */
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190 bool process_directives(char *directive)
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191 {
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192 enum directives d;
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193 char *value, *p, *q, *special;
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194 struct tokenval tokval;
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195 bool bad_param = false;
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196 int pass2 = passn > 1 ? 2 : 1;
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197
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198 d = parse_directive_line(&directive, &value);
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199
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200 switch (d) {
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201 case D_none:
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202 return D_none; /* Not a directive */
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203
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204 case D_corrupt:
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205 nasm_error(ERR_NONFATAL, "invalid directive line");
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206 break;
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207
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208 default: /* It's a backend-specific directive */
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209 switch (ofmt->directive(d, value, pass2)) {
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210 case DIRR_UNKNOWN:
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211 goto unknown;
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212 case DIRR_OK:
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213 case DIRR_ERROR:
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214 break;
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215 case DIRR_BADPARAM:
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216 bad_param = true;
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217 break;
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218 default:
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219 panic();
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220 }
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221 break;
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222
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223 case D_unknown:
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224 unknown:
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225 nasm_error(pass0 < 2 ? ERR_NONFATAL : ERR_PANIC,
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226 "unrecognised directive [%s]", directive);
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227 break;
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228
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229 case D_SEGMENT: /* [SEGMENT n] */
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230 case D_SECTION:
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231 {
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232 int sb;
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233 int32_t seg = ofmt->section(value, pass2, &sb);
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234
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235 if (seg == NO_SEG) {
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236 nasm_error(pass0 < 2 ? ERR_NONFATAL : ERR_PANIC,
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237 "segment name `%s' not recognized", value);
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238 } else {
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239 in_absolute = false;
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240 location.segment = seg;
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241 }
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242 break;
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243 }
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244
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245 case D_SECTALIGN: /* [SECTALIGN n] */
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246 {
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247 expr *e;
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248
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249 if (*value) {
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250 stdscan_reset();
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251 stdscan_set(value);
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252 tokval.t_type = TOKEN_INVALID;
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253 e = evaluate(stdscan, NULL, &tokval, NULL, pass2, NULL);
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254 if (e) {
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255 uint64_t align = e->value;
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256
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257 if (!is_power2(e->value)) {
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258 nasm_error(ERR_NONFATAL,
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259 "segment alignment `%s' is not power of two",
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260 value);
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261 } else if (align > UINT64_C(0x7fffffff)) {
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262 /*
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263 * FIXME: Please make some sane message here
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264 * ofmt should have some 'check' method which
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265 * would report segment alignment bounds.
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266 */
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267 nasm_error(ERR_NONFATAL,
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268 "absurdly large segment alignment `%s' (2^%d)",
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269 value, ilog2_64(align));
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270 }
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271
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272 /* callee should be able to handle all details */
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273 if (location.segment != NO_SEG)
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274 ofmt->sectalign(location.segment, align);
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275 }
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276 }
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277 break;
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278 }
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279
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280 case D_EXTERN: /* [EXTERN label:special] */
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281 if (*value == '$')
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282 value++; /* skip initial $ if present */
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283 if (pass0 == 2) {
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284 q = value;
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285 while (*q && *q != ':')
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286 q++;
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287 if (*q == ':') {
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288 *q++ = '\0';
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289 ofmt->symdef(value, 0L, 0L, 3, q);
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290 }
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291 } else if (passn == 1) {
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292 bool validid = true;
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293 q = value;
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294 if (!isidstart(*q))
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295 validid = false;
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296 while (*q && *q != ':') {
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297 if (!isidchar(*q))
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298 validid = false;
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299 q++;
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300 }
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301 if (!validid) {
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302 nasm_error(ERR_NONFATAL, "identifier expected after EXTERN");
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303 break;
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304 }
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305 if (*q == ':') {
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306 *q++ = '\0';
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307 special = q;
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308 } else
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309 special = NULL;
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310 if (!is_extern(value)) { /* allow re-EXTERN to be ignored */
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311 int temp = pass0;
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312 pass0 = 1; /* fake pass 1 in labels.c */
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313 declare_as_global(value, special);
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314 define_label(value, seg_alloc(), 0L, NULL,
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315 false, true);
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316 pass0 = temp;
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317 }
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318 } /* else pass0 == 1 */
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319 break;
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320
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321 case D_BITS: /* [BITS bits] */
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322 globalbits = get_bits(value);
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323 break;
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324
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325 case D_GLOBAL: /* [GLOBAL symbol:special] */
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326 if (*value == '$')
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327 value++; /* skip initial $ if present */
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328 if (pass0 == 2) { /* pass 2 */
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329 q = value;
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330 while (*q && *q != ':')
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331 q++;
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332 if (*q == ':') {
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333 *q++ = '\0';
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334 ofmt->symdef(value, 0L, 0L, 3, q);
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335 }
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336 } else if (pass2 == 1) { /* pass == 1 */
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337 bool validid = true;
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338
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339 q = value;
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340 if (!isidstart(*q))
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341 validid = false;
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342 while (*q && *q != ':') {
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343 if (!isidchar(*q))
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344 validid = false;
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345 q++;
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346 }
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347 if (!validid) {
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348 nasm_error(ERR_NONFATAL,
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349 "identifier expected after GLOBAL");
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350 break;
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351 }
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352 if (*q == ':') {
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353 *q++ = '\0';
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354 special = q;
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355 } else
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356 special = NULL;
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357 declare_as_global(value, special);
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358 } /* pass == 1 */
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359 break;
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360
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361 case D_COMMON: /* [COMMON symbol size:special] */
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362 {
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363 int64_t size;
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364 bool rn_error;
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365 bool validid;
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366
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367 if (*value == '$')
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368 value++; /* skip initial $ if present */
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369 p = value;
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370 validid = true;
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371 if (!isidstart(*p))
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372 validid = false;
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373 while (*p && !nasm_isspace(*p)) {
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374 if (!isidchar(*p))
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375 validid = false;
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376 p++;
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377 }
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378 if (!validid) {
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379 nasm_error(ERR_NONFATAL, "identifier expected after COMMON");
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380 break;
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381 }
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382 if (*p) {
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383 p = nasm_zap_spaces_fwd(p);
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384 q = p;
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385 while (*q && *q != ':')
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386 q++;
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387 if (*q == ':') {
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388 *q++ = '\0';
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389 special = q;
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390 } else {
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391 special = NULL;
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392 }
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393 size = readnum(p, &rn_error);
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394 if (rn_error) {
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395 nasm_error(ERR_NONFATAL,
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396 "invalid size specified"
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397 " in COMMON declaration");
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398 break;
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399 }
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400 } else {
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401 nasm_error(ERR_NONFATAL,
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402 "no size specified in"
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403 " COMMON declaration");
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404 break;
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405 }
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406
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407 if (pass0 < 2) {
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408 define_common(value, seg_alloc(), size, special);
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409 } else if (pass0 == 2) {
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410 if (special)
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411 ofmt->symdef(value, 0L, 0L, 3, special);
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412 }
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413 break;
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414 }
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415
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416 case D_ABSOLUTE: /* [ABSOLUTE address] */
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417 {
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418 expr *e;
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419
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420 stdscan_reset();
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421 stdscan_set(value);
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422 tokval.t_type = TOKEN_INVALID;
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423 e = evaluate(stdscan, NULL, &tokval, NULL, pass2, NULL);
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424 if (e) {
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425 if (!is_reloc(e))
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426 nasm_error(pass0 ==
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427 1 ? ERR_NONFATAL : ERR_PANIC,
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428 "cannot use non-relocatable expression as "
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429 "ABSOLUTE address");
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430 else {
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431 absolute.segment = reloc_seg(e);
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432 absolute.offset = reloc_value(e);
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433 }
|
|
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434 } else if (passn == 1)
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435 absolute.offset = 0x100; /* don't go near zero in case of / */
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436 else
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437 nasm_panic(0, "invalid ABSOLUTE address "
|
|
|
438 "in pass two");
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439 in_absolute = true;
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440 location.segment = NO_SEG;
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|
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441 break;
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|
|
442 }
|
|
|
443
|
|
|
444 case D_DEBUG: /* [DEBUG] */
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|
|
445 {
|
|
|
446 bool badid, overlong;
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|
447 char debugid[128];
|
|
|
448
|
|
|
449 p = value;
|
|
|
450 q = debugid;
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|
|
451 badid = overlong = false;
|
|
|
452 if (!isidstart(*p)) {
|
|
|
453 badid = true;
|
|
|
454 } else {
|
|
|
455 while (*p && !nasm_isspace(*p)) {
|
|
|
456 if (q >= debugid + sizeof debugid - 1) {
|
|
|
457 overlong = true;
|
|
|
458 break;
|
|
|
459 }
|
|
|
460 if (!isidchar(*p))
|
|
|
461 badid = true;
|
|
|
462 *q++ = *p++;
|
|
|
463 }
|
|
|
464 *q = 0;
|
|
|
465 }
|
|
|
466 if (badid) {
|
|
|
467 nasm_error(passn == 1 ? ERR_NONFATAL : ERR_PANIC,
|
|
|
468 "identifier expected after DEBUG");
|
|
|
469 break;
|
|
|
470 }
|
|
|
471 if (overlong) {
|
|
|
472 nasm_error(passn == 1 ? ERR_NONFATAL : ERR_PANIC,
|
|
|
473 "DEBUG identifier too long");
|
|
|
474 break;
|
|
|
475 }
|
|
|
476 p = nasm_skip_spaces(p);
|
|
|
477 if (pass0 == 2)
|
|
|
478 dfmt->debug_directive(debugid, p);
|
|
|
479 break;
|
|
|
480 }
|
|
|
481
|
|
|
482 case D_WARNING: /* [WARNING {+|-|*}warn-name] */
|
|
|
483 if (!set_warning_status(value)) {
|
|
|
484 nasm_error(ERR_WARNING|ERR_WARN_UNK_WARNING,
|
|
|
485 "unknown warning option: %s", value);
|
|
|
486 }
|
|
|
487 break;
|
|
|
488
|
|
|
489 case D_CPU: /* [CPU] */
|
|
|
490 cpu = get_cpu(value);
|
|
|
491 break;
|
|
|
492
|
|
|
493 case D_LIST: /* [LIST {+|-}] */
|
|
|
494 value = nasm_skip_spaces(value);
|
|
|
495 if (*value == '+') {
|
|
|
496 user_nolist = false;
|
|
|
497 } else {
|
|
|
498 if (*value == '-') {
|
|
|
499 user_nolist = true;
|
|
|
500 } else {
|
|
|
501 bad_param = true;
|
|
|
502 }
|
|
|
503 }
|
|
|
504 break;
|
|
|
505
|
|
|
506 case D_DEFAULT: /* [DEFAULT] */
|
|
|
507 stdscan_reset();
|
|
|
508 stdscan_set(value);
|
|
|
509 tokval.t_type = TOKEN_INVALID;
|
|
|
510 if (stdscan(NULL, &tokval) != TOKEN_INVALID) {
|
|
|
511 switch (tokval.t_integer) {
|
|
|
512 case S_REL:
|
|
|
513 globalrel = 1;
|
|
|
514 break;
|
|
|
515 case S_ABS:
|
|
|
516 globalrel = 0;
|
|
|
517 break;
|
|
|
518 case P_BND:
|
|
|
519 globalbnd = 1;
|
|
|
520 break;
|
|
|
521 case P_NOBND:
|
|
|
522 globalbnd = 0;
|
|
|
523 break;
|
|
|
524 default:
|
|
|
525 bad_param = true;
|
|
|
526 break;
|
|
|
527 }
|
|
|
528 } else {
|
|
|
529 bad_param = true;
|
|
|
530 }
|
|
|
531 break;
|
|
|
532
|
|
|
533 case D_FLOAT:
|
|
|
534 if (float_option(value)) {
|
|
|
535 nasm_error(pass0 < 2 ? ERR_NONFATAL : ERR_PANIC,
|
|
|
536 "unknown 'float' directive: %s", value);
|
|
|
537 }
|
|
|
538 break;
|
|
|
539
|
|
|
540 case D_PRAGMA:
|
|
|
541 process_pragma(value);
|
|
|
542 break;
|
|
|
543 }
|
|
|
544
|
|
|
545
|
|
|
546 /* A common error message */
|
|
|
547 if (bad_param) {
|
|
|
548 nasm_error(ERR_NONFATAL, "invalid parameter to [%s] directive",
|
|
|
549 directive);
|
|
|
550 }
|
|
|
551
|
|
|
552 return d != D_none;
|
|
|
553 }
|
