annotate src/insn_indexed.c @ 95:f3497072ac44

Fixed think-o in rm* ops (reversed pass number test)
author lost
date Sat, 17 Jan 2009 06:57:58 +0000
parents e12edcfbebd5
children f59c0916753d
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1 /*
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2 insn_indexed.c
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74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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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
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71 // initialize output bytes
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72 *b1 = *b2 = *b3 = -1;
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73
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74 // fetch out operand for lookup
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75 for (i = 0; i < 24; i++)
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76 {
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77 if (*((*p) + i) && !isspace(*((*p) + i)))
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78 stbuf[i] = *((*p) + i);
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79 else
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80 break;
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81 }
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82 stbuf[i] = '\0';
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83
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84 // now look up operand in "simple" table
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85 if (!*((*p) + i) || isspace(*((*p) + i)))
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86 {
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87 // do simple lookup
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88 for (j = 0; simpleindex[j].opstr[0]; j++)
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89 {
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90 if (!strcasecmp(stbuf, simpleindex[j].opstr))
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91 break;
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92 }
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93 if (simpleindex[j].opstr[0])
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94 {
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95 *b1 = simpleindex[j].pb;
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96 (*p) += i;
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97 return;
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98 }
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99 }
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100
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101 // now do the "hard" ones
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102
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103 // is it indirect?
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104 if (**p == '[')
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105 {
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106 indir = 1;
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107 (*p)++;
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108 }
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109
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110 // look for a "," - all indexed modes have a "," except extended indir
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111 rn = 0;
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112 for (i = 0; (*p)[i] && !isspace((*p)[i]); i++)
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113 {
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114 if ((*p)[i] == ',')
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115 {
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116 rn = 1;
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117 break;
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118 }
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119 }
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120
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121 // if no "," and indirect, do extended indir
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122 if (!rn && indir)
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123 {
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124 // extended indir
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125 *b1 = 0x9f;
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126 *b2 = 0;
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127 *b3 = 0;
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128 r = lwasm_expr_result2(as, l, (char **)p, 0, &v, 0);
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129 if (r < 0)
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130 {
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131 return;
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132 }
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133 if (**p != ']')
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134 {
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135 register_error(as, l, 1, "Bad operand");
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136 return;
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137 }
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138
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139 (*p)++;
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140
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141 if (r == 1 && as -> passnum == 2)
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142 {
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143 l -> relocoff = as -> addr - l -> codeaddr + 1;
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144 }
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145
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146 *b2 = (v >> 8) & 0xff;
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147 *b3 = v & 0xff;
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148 return;
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149 }
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150
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151 // if we've previously forced the offset size, make a note of it
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152 if (l -> fsize == 1)
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153 f8 = 1;
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154 else if (l -> fsize == 2)
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155 f16 = 1;
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156
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157 if (**p == '<')
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158 {
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159 f8 = 1;
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160 (*p)++;
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161 }
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162 else if (**p == '>')
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163 {
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164 f16 = 1;
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165 (*p)++;
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166 }
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167
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168 if (**p == '0' && *(*p+1) == ',')
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169 {
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170 f0 = 1;
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171 }
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172
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173 // now we have to evaluate the expression
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174 r = lwasm_expr_result2(as, l, (char **)p, 0, &v, 0);
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175 if (r < 0)
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176 {
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177 return;
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178 }
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179 if (f8 && r != 0)
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180 {
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181 register_error(as, l, 2, "Illegal external or inter-section reference");
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182 r = 0;
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183 v = 0;
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184 }
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185
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186 // now look for a comma; if not present, explode
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187 if (*(*p)++ != ',')
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188 {
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189 // syntax error; force 0 bit
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190 *b1 = 00;
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191 l -> fsize = 0;
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192 return;
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193 }
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194
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195 // now get the register
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196 rn = lwasm_lookupreg3(regs, p);
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197 if (rn < 0)
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198 {
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199 *b1 = 0;
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200 l -> fsize = 0;
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201 register_error(as, l, 1, "Bad register");
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202 return;
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
203 }
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
204
32
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
205 if (indir)
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
206 {
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
207 if (**p != ']')
81
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
208 {
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
209 register_error(as, l, 1, "Bad operand");
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
210 l -> fsize = 0;
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
211 *b1 = 0;
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
212 return;
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
213 }
32
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
214 else
9bd0fbfe7405 Added basic indexed mode handling
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parents:
diff changeset
215 (*p)++;
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
216 }
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
217
81
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
218 // incomplete reference on pass 1 forces 16 bit
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
219 if (r == 1 && as -> passnum == 1)
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
220 {
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
221 f16 = 1;
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
222 l -> fsize = 2;
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 // incomplete reference on pass 2 needs relocoff set
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
226 if (r == 1 && as -> passnum == 2)
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
227 {
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
228 l -> relocoff = as -> addr - l -> codeaddr + 1;
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
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
231 // nnnn,W is only 16 bit (or 0 bit)
32
9bd0fbfe7405 Added basic indexed mode handling
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parents:
diff changeset
232 if (rn == 4)
9bd0fbfe7405 Added basic indexed mode handling
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parents:
diff changeset
233 {
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
234 if (f8)
81
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
235 {
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
236 register_error(as, l, 1, "n,W cannot be 8 bit");
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
237 l -> fsize = 0;
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
238 *b1 = 0;
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
239 return;
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
240 }
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
241 // note: set f16 above for incomplete references
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
242 // also set reloc offset
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
243 if (!f16 && !f0 && !(as -> pragmas & PRAGMA_NOINDEX0TONONE) && v == 0)
32
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
244 {
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
245 if (indir)
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
246 *b1 = 0x90;
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
247 else
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
248 *b1 = 0x8f;
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
249 return;
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
250 }
81
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
251
32
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
252 if (indir)
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
253 *b1 = 0xb0;
9bd0fbfe7405 Added basic indexed mode handling
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parents:
diff changeset
254 else
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
255 *b1 = 0xcf;
81
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
256 *b2 = (v >> 8) & 0xff;
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
257 *b3 = v & 0xff;
32
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
258 return;
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
259 }
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
260
81
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
261 // set indir to correct bit value
32
9bd0fbfe7405 Added basic indexed mode handling
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parents:
diff changeset
262 if (indir) indir = 0x10;
9bd0fbfe7405 Added basic indexed mode handling
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parents:
diff changeset
263
81
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
264 // PCR? then we have PC relative addressing (like B??, LB??)
32
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
265 if (rn == 5)
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
266 {
81
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
267 // FIXME: handle external references sensibly
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
268 v -= as -> addr;
32
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
269
9bd0fbfe7405 Added basic indexed mode handling
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parents:
diff changeset
270 // we have a slight problem here
9bd0fbfe7405 Added basic indexed mode handling
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parents:
diff changeset
271 // PCR based on current insn loc is really
9bd0fbfe7405 Added basic indexed mode handling
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parents:
diff changeset
272 // -125 <= offset <= +130 (8 bit offset)
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
273 // NOTE: when we are called, we already have the opcode emitted
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
274 // so we only need to worry about the size of the operand
9bd0fbfe7405 Added basic indexed mode handling
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parents:
diff changeset
275 // hence the 2 and 3 magic numbers below instead of 3 and 4
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
276 // (and that also avoids errors with two byte opcodes, etc)
81
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
277 if (f8 || (!f16 && v >= -125 && v <= 130))
32
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
278 {
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
279 *b1 = indir | 0x8C;
81
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
280 v -= 2;
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
281 if (v < -128 || v > 127)
32
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
282 register_error(as, l, 2, "Byte overflow");
81
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
283 *b2 = v & 0xff;
32
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
284 return;
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
285 }
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
286
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
287 // anything else is 16 bit offset
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
288 // need 16 bit
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
289 *b1 = indir | 0x8D;
81
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
290 v -= 3;
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
291 *b2 = (v >> 8) & 0xff;
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
292 *b3 = v & 0xff;
32
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
293 return;
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
294 }
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
295
81
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
296 // constant offset from PC (using PC as regular register :) )
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
297 // FIXME: handle external references intelligently
32
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
298 if (rn == 6)
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
299 {
81
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
300 if (f8 || (!f16 && v >= -128 && v <= 127))
32
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
301 {
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
302 *b1 = indir | 0x8C;
81
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
303 if (v < -128 || v > 127)
32
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
304 register_error(as, l, 2, "Byte overflow");
81
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
305 *b2 = v & 0xff;
32
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
306 return;
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
307 }
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
308
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
309 // everything else must be 16 bit
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
310 // need 16 bit
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
311 *b1 = indir | 0x8D;
81
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
312 *b2 = (v >> 8) & 0xff;
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
313 *b3 = v & 0xff;
32
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
314 return;
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
315 }
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
316
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
317 // 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
318 if (!f8 && !f16 && v >= -16 && v <= 15)
32
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
319 {
81
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
320 // zero offset going to ,R?
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
321 if (v == 0 && !f0 && !(as -> pragmas & PRAGMA_NOINDEX0TONONE))
32
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
322 {
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
323 *b1 = rn << 5 | indir | 0x80 | 0x04;
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
324 return;
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
325 }
81
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
326
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
327 // no 5 bit on indirect
32
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
328 if (indir)
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
329 {
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
330 f8 = 1;
81
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
331 l -> fsize = 1;
32
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
332 goto no5bit;
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
333 }
81
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
334
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
335 // 5 bit addressing
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
336 *b1 = rn << 5 | (v & 0x1F);
32
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
337 return;
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
338 }
81
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
339
32
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
340 no5bit:
81
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
341 if (f16 || (!f8 && (v < -128 || v > 127)))
32
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
342 {
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
343 // must be a 16 bit offset here
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
344 *b1 = rn << 5 | indir | 0x80 | 0x09;
81
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
345 *b2 = (v >> 8) & 0xff;
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
346 *b3 = v & 0xff;
32
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
347 return;
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
348 }
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
349
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
350 // if we're here, we have an 8 bit offset
81
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
351 // note: cannot get here if incomplete reference detected above
32
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
352 *b1 = rn << 5 | indir | 0x80 | 0x08;
81
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
353 if (v < -128 || v > 127)
32
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
354 register_error(as, l, 2, "Byte overflow");
81
b6b1e79cc277 Moved indexed modes to new expression framework
lost
parents: 37
diff changeset
355 *b2 = v & 0xff;
32
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
356 return;
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
357 }
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
358
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
359 OPFUNC(insn_indexed)
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
360 {
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
361 int b1, b2, b3;
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
362
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
363 lwasm_emitop(as, l, instab[opnum].ops[0]);
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
364
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
365 insn_indexed_aux(as, l, (const char **)p, &b1, &b2, &b3);
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
366 if (b1 != -1)
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
367 lwasm_emit(as, l, b1);
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
368 if (b2 != -1)
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
369 lwasm_emit(as, l, b2);
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
370 if (b3 != -1)
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
371 lwasm_emit(as, l, b3);
9bd0fbfe7405 Added basic indexed mode handling
lost
parents:
diff changeset
372 }