annotate src/insn_indexed.c @ 253:c537a3a723fc 2.x

Fixed obscure comment detection bug
author lost
date Wed, 09 Dec 2009 03:59:26 +0000
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1 /*
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2 insn_indexed.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 /*
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22 for handling indexed mode instructions
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23 */
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24
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25 #define __insn_indexed_c_seen__
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26
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27 #include <ctype.h>
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28 #include <string.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 #include "expr.h"
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33
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34 void insn_indexed_aux(asmstate_t *as, lwasm_line_t *l, const char **p, int *b1, int *b2, int *b3)
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35 {
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36 static const char *regs = "X Y U S W PCRPC ";
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37 static const struct { char *opstr; int pb; } simpleindex[] =
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38 {
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39 {",x", 0x84}, {",y", 0xa4}, {",u", 0xc4}, {",s", 0xe4},
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40 {",x+", 0x80}, {",y+", 0xa0}, {",u+", 0xc0}, {",s+", 0xe0},
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41 {",x++", 0x81}, {",y++", 0xa1}, {",u++", 0xc1}, {",s++", 0xe1},
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42 {",-x", 0x82}, {",-y", 0xa2}, {",-u", 0xc2}, {",-s", 0xe2},
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43 {",--x", 0x83}, {",--y", 0xa3}, {",--u", 0xc3}, {",--s", 0xe3},
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44 {"a,x", 0x86}, {"a,y", 0xa6}, {"a,u", 0xc6}, {"a,s", 0xe6},
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45 {"b,x", 0x85}, {"b,y", 0xa5}, {"b,u", 0xc5}, {"b,s", 0xe5},
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46 {"e,x", 0x87}, {"e,y", 0xa7}, {"e,u", 0xc7}, {"e,s", 0xe7},
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47 {"f,x", 0x8a}, {"f,y", 0xaa}, {"f,u", 0xca}, {"f,s", 0xea},
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48 {"d,x", 0x8b}, {"d,y", 0xab}, {"d,u", 0xcb}, {"d,s", 0xed},
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49 {"w,x", 0x8e}, {"w,y", 0xae}, {"w,u", 0xce}, {"w,s", 0xee},
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50 {",w", 0x8f}, {",w++", 0xcf}, {",--w", 0xef},
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51
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52 {"[,x]", 0x94}, {"[,y]", 0xb4}, {"[,u", 0xd4}, {"[,s]", 0xf4},
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53 {"[,x++]", 0x91}, {"[,y++]", 0xb1}, {"[,u++]", 0xd1}, {"[,s++]", 0xf1},
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54 {"[,--x]", 0x93}, {"[,--y]", 0xb3}, {"[,--u]", 0xd3}, {"[,--s]", 0xf3},
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55 {"[a,x]", 0x96}, {"[a,y]", 0xb6}, {"[a,u]", 0xd6}, {"[a,s]", 0xf6},
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56 {"[b,x]", 0x95}, {"[b,y]", 0xb5}, {"[b,u]", 0xd5}, {"[b,s]", 0xf5},
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57 {"[e,x]", 0x97}, {"[e,y]", 0xb7}, {"[e,u]", 0xd7}, {"[e,s]", 0xf7},
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58 {"[f,x]", 0x9a}, {"[f,y]", 0xba}, {"[f,u]", 0xda}, {"[f,s]", 0xfa},
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59 {"[d,x]", 0x9b}, {"[d,y]", 0xbb}, {"[d,u]", 0xdb}, {"[d,s]", 0xfd},
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60 {"[w,x]", 0x9e}, {"[w,y]", 0xbe}, {"[w,u]", 0xde}, {"[w,s]", 0xfe},
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61 {"[,w]", 0x90}, {"[,w++]", 0xd0}, {"[,--w]", 0xf0},
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62
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63 { "", -1 }
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64 };
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65 char stbuf[25];
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66 int i, j, rn;
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67 int f8 = 0, f16 = 0, f0 = 0;
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68 int r, v;
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69 int indir = 0;
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70 int fs8 = 0, fs16 = 0;
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71
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72 // initialize output bytes
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73 *b1 = *b2 = *b3 = -1;
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74
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75 // fetch out operand for lookup
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76 for (i = 0; i < 24; i++)
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77 {
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78 if (*((*p) + i) && !isspace(*((*p) + i)))
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79 stbuf[i] = *((*p) + i);
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80 else
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81 break;
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82 }
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83 stbuf[i] = '\0';
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84
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85 // now look up operand in "simple" table
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86 if (!*((*p) + i) || isspace(*((*p) + i)))
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87 {
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88 // do simple lookup
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89 for (j = 0; simpleindex[j].opstr[0]; j++)
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90 {
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91 if (!strcasecmp(stbuf, simpleindex[j].opstr))
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92 break;
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93 }
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94 if (simpleindex[j].opstr[0])
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95 {
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96 *b1 = simpleindex[j].pb;
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97 (*p) += i;
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98 return;
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99 }
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100 }
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101
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102 // now do the "hard" ones
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103
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104 // is it indirect?
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105 if (**p == '[')
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106 {
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107 indir = 1;
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108 (*p)++;
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109 }
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110
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111 // look for a "," - all indexed modes have a "," except extended indir
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112 rn = 0;
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113 for (i = 0; (*p)[i] && !isspace((*p)[i]); i++)
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114 {
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115 if ((*p)[i] == ',')
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116 {
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117 rn = 1;
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118 break;
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119 }
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120 }
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121
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122 // if no "," and indirect, do extended indir
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123 if (!rn && indir)
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124 {
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125 // extended indir
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126 *b1 = 0x9f;
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127 *b2 = 0;
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128 *b3 = 0;
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129 r = lwasm_expr_result2(as, l, (char **)p, 0, &v, 0);
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130 if (r < 0)
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131 {
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132 return;
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133 }
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134 if (**p != ']')
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135 {
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136 register_error(as, l, 1, "Bad operand");
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137 return;
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138 }
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139
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140 (*p)++;
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141
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142 if (r == 1 && as -> passnum == 2)
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143 {
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144 l -> relocoff = as -> addr - l -> codeaddr + 1;
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145 }
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146
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147 *b2 = (v >> 8) & 0xff;
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148 *b3 = v & 0xff;
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149 return;
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150 }
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151
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152 // if we've previously forced the offset size, make a note of it
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153 if (l -> fsize == 1)
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154 f8 = 1;
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155 else if (l -> fsize == 2)
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156 f16 = 1;
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157
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158 if (**p == '<')
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159 {
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160 fs8 = 1;
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161 (*p)++;
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162 }
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163 else if (**p == '>')
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164 {
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165 fs16 = 1;
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166 (*p)++;
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167 }
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168
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169 if (**p == '0' && *(*p+1) == ',')
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170 {
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171 f0 = 1;
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172 }
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173
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174 // now we have to evaluate the expression
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175 r = lwasm_expr_result2(as, l, (char **)p, 0, &v, 0);
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176 if (r < 0)
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177 {
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178 return;
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179 }
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180 // now look for a comma; if not present, explode
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181 if (*(*p)++ != ',')
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182 {
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183 // syntax error; force 0 bit
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184 *b1 = 00;
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185 l -> fsize = 0;
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186 return;
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187 }
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188
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189 // now get the register
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190 rn = lwasm_lookupreg3(regs, p);
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191 if (rn < 0)
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192 {
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193 *b1 = 0;
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194 l -> fsize = 0;
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195 register_error(as, l, 1, "Bad register");
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196 return;
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197 }
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198
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199 if (indir)
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200 {
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201 if (**p != ']')
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202 {
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
203 register_error(as, l, 1, "Bad operand");
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
204 l -> fsize = 0;
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
205 *b1 = 0;
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
206 return;
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
207 }
32
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
208 else
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
209 (*p)++;
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
210 }
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
211
81
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
212 // incomplete reference on pass 1 forces 16 bit
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
213 if (r == 1 && as -> passnum == 1)
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
214 {
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
215 f16 = 1;
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
216 l -> fsize = 2;
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
217 }
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
218
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
219 // incomplete reference on pass 2 needs relocoff set
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
220 if (r == 1 && as -> passnum == 2)
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
221 {
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
222 l -> relocoff = as -> addr - l -> codeaddr + 1;
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
223 }
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
224
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
225 // nnnn,W is only 16 bit (or 0 bit)
32
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
226 if (rn == 4)
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
227 {
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
228 if (f8)
81
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
229 {
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
230 register_error(as, l, 1, "n,W cannot be 8 bit");
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
231 l -> fsize = 0;
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
232 *b1 = 0;
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
233 return;
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
234 }
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
235 // note: set f16 above for incomplete references
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
236 // also set reloc offset
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
237 if (!f16 && !f0 && !(as -> pragmas & PRAGMA_NOINDEX0TONONE) && v == 0)
32
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
238 {
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
239 if (indir)
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
240 *b1 = 0x90;
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
241 else
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
242 *b1 = 0x8f;
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
243 return;
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
244 }
81
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
245
32
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
246 if (indir)
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
247 *b1 = 0xb0;
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
248 else
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
249 *b1 = 0xcf;
81
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
250 *b2 = (v >> 8) & 0xff;
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
251 *b3 = v & 0xff;
32
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
252 return;
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
253 }
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
254
81
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
255 // set indir to correct bit value
32
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
256 if (indir) indir = 0x10;
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
257
81
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
258 // PCR? then we have PC relative addressing (like B??, LB??)
32
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
259 if (rn == 5)
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
260 {
101
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 84
diff changeset
261 lwasm_expr_term_t *t;
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 84
diff changeset
262 // external references are handled exactly the same as for
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 84
diff changeset
263 // relative addressing modes
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 84
diff changeset
264 // on pass 1, adjust the expression for a subtraction of the
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 84
diff changeset
265 // current address
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 84
diff changeset
266
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 84
diff changeset
267 // need to re-evaluate the expression with "SECTCONST"...
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 84
diff changeset
268 r = lwasm_expr_result2(as, l, (char **)p, EXPR_SECTCONST | EXPR_REEVAL, &v, 0);
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 84
diff changeset
269 if (r != 0)
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 84
diff changeset
270 v = 0;
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 84
diff changeset
271 if (as -> passnum == 1)
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 84
diff changeset
272 {
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 84
diff changeset
273 l -> fsize = 0;
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 84
diff changeset
274 }
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 84
diff changeset
275 f8 = f16 = 0;
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 84
diff changeset
276 if (r == 1 && as -> passnum == 1 && !fs8)
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 84
diff changeset
277 {
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 84
diff changeset
278 l -> fsize = 2;
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 84
diff changeset
279 f16 = 1;
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 84
diff changeset
280 }
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 84
diff changeset
281 if (fs8)
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 84
diff changeset
282 f8 = 1;
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 84
diff changeset
283 if (fs16)
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 84
diff changeset
284 f16 = 1;
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 84
diff changeset
285 if (l -> fsize == 2)
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 84
diff changeset
286 f16 = 1;
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 84
diff changeset
287 else if (l -> fsize == 1)
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 84
diff changeset
288 f8 = 1;
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 84
diff changeset
289 if (as -> passnum == 1)
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 84
diff changeset
290 v -= as -> addr;
32
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
291
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
292 // we have a slight problem here
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
293 // PCR based on current insn loc is really
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
294 // -125 <= offset <= +130 (8 bit offset)
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
295 // NOTE: when we are called, we already have the opcode emitted
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
296 // so we only need to worry about the size of the operand
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
297 // hence the 2 and 3 magic numbers below instead of 3 and 4
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
298 // (and that also avoids errors with two byte opcodes, etc)
81
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
299 if (f8 || (!f16 && v >= -125 && v <= 130))
32
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
300 {
101
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 84
diff changeset
301 f8 = 1;
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 84
diff changeset
302 l -> fsize = 1;
32
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
303 *b1 = indir | 0x8C;
101
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 84
diff changeset
304 if (as -> passnum == 1)
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 84
diff changeset
305 v -= 2;
81
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
306 if (v < -128 || v > 127)
32
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
307 register_error(as, l, 2, "Byte overflow");
81
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
308 *b2 = v & 0xff;
101
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 84
diff changeset
309 if (r != 0 && as -> passnum == 2)
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 84
diff changeset
310 {
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 84
diff changeset
311 register_error(as, l, 2, "Illegal incomplete reference");
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 84
diff changeset
312 }
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 84
diff changeset
313 goto finpcr;
32
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
314 }
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
315
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
316 // anything else is 16 bit offset
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
317 // need 16 bit
101
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 84
diff changeset
318
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 84
diff changeset
319 l -> fsize = 2;
32
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
320 *b1 = indir | 0x8D;
101
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 84
diff changeset
321 if (as -> passnum == 1)
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 84
diff changeset
322 v -= 3;
81
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
323 *b2 = (v >> 8) & 0xff;
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
324 *b3 = v & 0xff;
101
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 84
diff changeset
325 if (as -> passnum == 2 && r == 1)
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 84
diff changeset
326 {
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 84
diff changeset
327 t = lwasm_expr_term_create_secbase();
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 84
diff changeset
328 lwasm_expr_stack_push(l -> exprs[0], t);
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 84
diff changeset
329 lwasm_expr_term_free(t);
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 84
diff changeset
330 t = lwasm_expr_term_create_oper(LWASM_OPER_MINUS);
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 84
diff changeset
331 lwasm_expr_stack_push(l -> exprs[0], t);
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 84
diff changeset
332 lwasm_expr_term_free(t);
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 84
diff changeset
333 }
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 84
diff changeset
334
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 84
diff changeset
335 finpcr:
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 84
diff changeset
336 if (as -> passnum == 1)
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 84
diff changeset
337 {
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 84
diff changeset
338 // need to adjust the expression
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 84
diff changeset
339 if (l -> exprs[0])
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 84
diff changeset
340 {
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 84
diff changeset
341 t = lwasm_expr_term_create_int(as -> addr + (f8 ? 2 : 3));
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 84
diff changeset
342 lwasm_expr_stack_push(l -> exprs[0], t);
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 84
diff changeset
343 lwasm_expr_term_free(t);
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 84
diff changeset
344 t = lwasm_expr_term_create_oper(LWASM_OPER_MINUS);
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 84
diff changeset
345 lwasm_expr_stack_push(l -> exprs[0], t);
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 84
diff changeset
346 lwasm_expr_term_free(t);
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 84
diff changeset
347 }
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 84
diff changeset
348 else
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 84
diff changeset
349 {
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 84
diff changeset
350 l -> exprvals[0] -= as -> addr + (f8 ? 2 : 3);
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 84
diff changeset
351 }
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 84
diff changeset
352 }
32
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
353 return;
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
354 }
101
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 84
diff changeset
355 if (fs16)
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 84
diff changeset
356 f16 = 1;
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 84
diff changeset
357 if (fs8)
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 84
diff changeset
358 f8 = 1;
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 84
diff changeset
359
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 84
diff changeset
360 if (f8 && r != 0)
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 84
diff changeset
361 {
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 84
diff changeset
362 register_error(as, l, 2, "Illegal external or inter-section reference");
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 84
diff changeset
363 r = 0;
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 84
diff changeset
364 v = 0;
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 84
diff changeset
365 }
32
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
366
81
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
367 // constant offset from PC (using PC as regular register :) )
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
368 // FIXME: handle external references intelligently
32
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
369 if (rn == 6)
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
370 {
81
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
371 if (f8 || (!f16 && v >= -128 && v <= 127))
32
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
372 {
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
373 *b1 = indir | 0x8C;
81
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
374 if (v < -128 || v > 127)
32
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
375 register_error(as, l, 2, "Byte overflow");
81
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
376 *b2 = v & 0xff;
32
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
377 return;
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
378 }
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
379
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
380 // everything else must be 16 bit
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
381 // need 16 bit
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
382 *b1 = indir | 0x8D;
81
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
383 *b2 = (v >> 8) & 0xff;
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
384 *b3 = v & 0xff;
32
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
385 return;
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
386 }
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
387
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
388 // we only have to deal with x,y,u,s here
81
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
389 if (!f8 && !f16 && v >= -16 && v <= 15)
32
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
390 {
81
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
391 // zero offset going to ,R?
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
392 if (v == 0 && !f0 && !(as -> pragmas & PRAGMA_NOINDEX0TONONE))
32
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
393 {
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
394 *b1 = rn << 5 | indir | 0x80 | 0x04;
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
395 return;
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
396 }
81
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
397
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
398 // no 5 bit on indirect
32
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
399 if (indir)
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
400 {
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
401 f8 = 1;
81
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
402 l -> fsize = 1;
32
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
403 goto no5bit;
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
404 }
81
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
405
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
406 // 5 bit addressing
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
407 *b1 = rn << 5 | (v & 0x1F);
32
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
408 return;
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
409 }
81
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
410
32
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
411 no5bit:
81
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
412 if (f16 || (!f8 && (v < -128 || v > 127)))
32
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
413 {
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
414 // must be a 16 bit offset here
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
415 *b1 = rn << 5 | indir | 0x80 | 0x09;
81
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
416 *b2 = (v >> 8) & 0xff;
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
417 *b3 = v & 0xff;
32
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
418 return;
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
419 }
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
420
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
421 // if we're here, we have an 8 bit offset
81
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
422 // note: cannot get here if incomplete reference detected above
32
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
423 *b1 = rn << 5 | indir | 0x80 | 0x08;
81
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
424 if (v < -128 || v > 127)
32
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
425 register_error(as, l, 2, "Byte overflow");
81
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
426 *b2 = v & 0xff;
32
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
427 return;
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
428 }
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
429
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
430 OPFUNC(insn_indexed)
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
431 {
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
432 int b1, b2, b3;
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
433
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
434 lwasm_emitop(as, l, instab[opnum].ops[0]);
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
435
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
436 insn_indexed_aux(as, l, (const char **)p, &b1, &b2, &b3);
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
437 if (b1 != -1)
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
438 lwasm_emit(as, l, b1);
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
439 if (b2 != -1)
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
440 lwasm_emit(as, l, b2);
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
441 if (b3 != -1)
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
442 lwasm_emit(as, l, b3);
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
443 }