Mercurial > hg-old > index.cgi
annotate lwasm/insn_gen.c @ 218:03044871c575
Fixed a stupid regression with forced included library files
author | lost |
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date | Sat, 25 Apr 2009 02:14:12 +0000 |
parents | bae1e3ecdce1 |
children | 2b254f02b252 |
rev | line source |
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0 | 1 /* |
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2 insn_gen.c, Copyright © 2009 William Astle |
4
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3 |
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4 This file is part of LWASM. |
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5 |
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6 LWASM is free software: you can redistribute it and/or modify it under the |
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7 terms of the GNU General Public License as published by the Free Software |
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8 Foundation, either version 3 of the License, or (at your option) any later |
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9 version. |
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10 |
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11 This program is distributed in the hope that it will be useful, but WITHOUT |
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12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
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14 more details. |
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15 |
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16 You should have received a copy of the GNU General Public License along with |
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17 this program. If not, see <http://www.gnu.org/licenses/>. |
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18 |
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19 Contains code for parsing general addressing modes (IMM+DIR+EXT+IND) |
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20 */ |
0 | 21 |
212 | 22 #include <config.h> |
23 | |
0 | 24 #include <ctype.h> |
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25 #include <stdlib.h> |
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26 |
0 | 27 #include "lwasm.h" |
28 #include "instab.h" | |
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29 #include "expr.h" |
0 | 30 |
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31 extern void insn_indexed_aux(asmstate_t *as, lwasm_line_t *l, const char **p, int *b1, int *b2, int *b3); |
0 | 32 |
34 | 33 // "extra" is required due to the way OIM, EIM, TIM, and AIM work |
34 void insn_gen_aux(asmstate_t *as, lwasm_line_t *l, char **optr, int opnum, int extra) | |
0 | 35 { |
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36 int b1 = -1, b2 = -1, b3 = -1; |
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37 |
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38 const char *optr2; |
0 | 39 int v1, tv, rval; |
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40 lwasm_expr_stack_t *s; |
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41 int f8 = 0; |
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42 int f16 = 0; |
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43 int isdp = 0; |
77 | 44 |
0 | 45 optr2 = *optr; |
46 while (*optr2 && !isspace(*optr2) && *optr2 != ',') optr2++ | |
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47 /* do nothing */ ; |
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48 |
0 | 49 if (*optr2 != ',' && **optr != '[') |
50 { | |
51 // not indexed | |
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52 if (l -> fsize == 1) |
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53 f8 = 1; |
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54 else if (l -> fsize == 2) |
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55 f16 = 1; |
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56 |
0 | 57 if (**optr == '<') |
58 { | |
59 (*optr)++; | |
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60 f8 = 1; |
0 | 61 } |
163 | 62 // for compatibility with asxxxx |
63 // * followed by a digit, alpha, or _, or ., or ?, or another * is "f8" | |
64 else if (**optr == '*') | |
65 { | |
66 tv = *(*optr + 1); | |
67 if (isdigit(tv) || isalpha(tv) || tv == '_' || tv == '.' || tv == '?' || tv == '@' || tv == '*' || tv == '+' || tv == '-') | |
68 { | |
69 f8 = 1; | |
70 (*optr)++; | |
71 } | |
72 } | |
0 | 73 else if (**optr == '>') |
74 { | |
75 (*optr)++; | |
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76 f16 = 1; |
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77 } |
77 | 78 rval = lwasm_expr_result2(as, l, optr, 0, &v1, 0); |
79 if (rval != 0) | |
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80 { |
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81 f16 = 1; |
77 | 82 v1 = 0; |
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83 l -> fsize = 2; |
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84 } |
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85 |
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86 if (((v1 >> 8) & 0xff) == (as -> dpval & 0xff)) |
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87 isdp = 1; |
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88 |
77 | 89 // disallow non-explicit DP in obj target |
90 if (as -> outformat == OUTPUT_OBJ && !f8) | |
91 f16 = 1; | |
92 | |
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93 if (f8 || (!f16 && isdp)) |
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94 { |
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95 v1 = v1 & 0xffff; |
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96 tv = v1 - ((as -> dpval) << 8); |
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97 if (tv < 0 || tv > 0xff) |
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98 { |
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99 register_error(as, l, 2, "Byte overflow"); |
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100 } |
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101 v1 = v1 & 0xff; |
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102 lwasm_emitop(as, l, instab[opnum].ops[0]); |
34 | 103 if (extra != -1) |
104 lwasm_emit(as, l, extra); | |
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105 lwasm_emit(as, l, v1 & 0xff); |
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106 l -> relocoff = as -> addr - l -> codeaddr; |
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107 l -> reloc8bit = 1; |
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108 return; |
0 | 109 } |
110 else | |
111 { | |
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112 // everything else is 16 bit.... |
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113 lwasm_emitop(as, l, instab[opnum].ops[2]); |
34 | 114 if (extra != -1) |
115 lwasm_emit(as, l, extra); | |
77 | 116 l -> relocoff = as -> addr - l -> codeaddr; |
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117 lwasm_emit(as, l, v1 >> 8); |
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118 lwasm_emit(as, l, v1 & 0xff); |
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119 return; |
0 | 120 } |
121 } | |
122 | |
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123 lwasm_emitop(as, l, instab[opnum].ops[1]); |
34 | 124 if (extra != -1) |
125 lwasm_emit(as, l, extra); | |
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126 insn_indexed_aux(as, l, (const char **)optr, &b1, &b2, &b3); |
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127 if (b1 != -1) |
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128 lwasm_emit(as, l, b1); |
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129 if (b2 != -1) |
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130 lwasm_emit(as, l, b2); |
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131 if (b3 != -1) |
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132 lwasm_emit(as, l, b3); |
0 | 133 return; |
134 } | |
135 | |
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136 // the various insn_gen? functions have an immediate mode of ? bits |
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137 OPFUNC(insn_gen0) |
0 | 138 { |
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139 if (**p == '#') |
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140 { |
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141 register_error(as, l, 1, "Immediate mode not allowed"); |
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142 return; |
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143 } |
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144 |
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145 // handle non-immediate |
34 | 146 insn_gen_aux(as, l, p, opnum, -1); |
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147 } |
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148 |
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149 OPFUNC(insn_gen8) |
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150 { |
0 | 151 int rval; |
77 | 152 int r; |
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153 |
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154 if (**p == '#') |
0 | 155 { |
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156 lwasm_emitop(as, l, instab[opnum].ops[3]); |
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157 (*p)++; |
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158 r = lwasm_expr_result2(as, l, p, 0, &rval, 0); |
77 | 159 if (r != 0) |
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160 rval = 0; |
77 | 161 if (r == 1 && as -> passnum == 2) |
162 register_error(as, l, 2, "Illegal external or intersegment reference"); | |
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163 lwasm_emit(as, l, rval & 0xff); |
0 | 164 return; |
165 } | |
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166 |
34 | 167 insn_gen_aux(as, l, p, opnum, -1); |
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168 } |
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169 |
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170 OPFUNC(insn_gen16) |
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171 { |
77 | 172 int rval, r; |
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173 |
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174 if (**p == '#') |
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175 { |
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176 lwasm_emitop(as, l, instab[opnum].ops[3]); |
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177 (*p)++; |
77 | 178 |
179 r = lwasm_expr_result2(as, l, p, 0, &rval, 0); | |
180 if (r != 0) | |
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181 rval = 0; |
77 | 182 if (r == 1 && as -> passnum == 2) |
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183 { |
77 | 184 l -> relocoff = as -> addr - l -> codeaddr; |
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185 } |
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186 lwasm_emit(as, l, (rval >> 8) & 0xff); |
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187 lwasm_emit(as, l, rval & 0xff); |
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188 return; |
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189 } |
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190 |
34 | 191 insn_gen_aux(as, l, p, opnum, -1); |
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192 } |
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193 |
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194 OPFUNC(insn_gen32) |
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195 { |
77 | 196 int r, rval; |
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197 |
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198 if (**p == '#') |
0 | 199 { |
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200 lwasm_emitop(as, l, instab[opnum].ops[3]); |
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201 (*p)++; |
77 | 202 |
203 r = lwasm_expr_result2(as, l, p, 0, &rval, 0); | |
204 if (r != 0) | |
205 rval = 0; | |
206 if (r == 1 && as -> passnum == 2) | |
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207 { |
77 | 208 register_error(as, l, 2, "Illegal external or intersegment reference"); |
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209 } |
77 | 210 |
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211 lwasm_emit(as, l, (rval >> 24) & 0xff); |
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212 lwasm_emit(as, l, (rval >> 16) & 0xff); |
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213 lwasm_emit(as, l, (rval >> 8) & 0xff); |
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214 lwasm_emit(as, l, rval & 0xff); |
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215 return; |
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216 } |
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217 |
34 | 218 insn_gen_aux(as, l, p, opnum, -1); |
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219 } |
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220 |
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221 OPFUNC(insn_imm8) |
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222 { |
77 | 223 int r, rval; |
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224 |
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225 if (**p == '#') |
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226 { |
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227 lwasm_emitop(as, l, instab[opnum].ops[0]); |
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228 (*p)++; |
77 | 229 |
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230 r = lwasm_expr_result2(as, l, p, 0, &rval, 0); |
77 | 231 if (r != 0) |
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232 rval = 0; |
77 | 233 if (r == 1 && as -> passnum == 2) |
234 register_error(as, l, 2, "Illegal external or intersegment reference"); | |
235 | |
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236 if (rval < -128 || rval > 255) |
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237 register_error(as, l, 2, "Byte overflow"); |
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238 lwasm_emit(as, l, rval & 0xff); |
0 | 239 return; |
240 } | |
241 | |
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242 register_error(as, l, 1, "Bad operand"); |
0 | 243 } |