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428
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1 /*
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2 * Copyright (c) 1995 by Sun Microsystems, Inc.
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3 * All rights reserved.
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4 *
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5 * This source code is a product of Sun Microsystems, Inc. and is provided
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6 * for unrestricted use provided that this legend is included on all tape
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7 * media and as a part of the software program in whole or part. Users
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8 * may copy or modify this source code without charge, but are not authorized
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9 * to license or distribute it to anyone else except as part of a product or
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10 * program developed by the user.
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11 *
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12 * THIS PROGRAM CONTAINS SOURCE CODE COPYRIGHTED BY SUN MICROSYSTEMS, INC.
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13 * SUN MICROSYSTEMS, INC., MAKES NO REPRESENTATIONS ABOUT THE SUITABLITY
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14 * OF SUCH SOURCE CODE FOR ANY PURPOSE. IT IS PROVIDED "AS IS" WITHOUT
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15 * EXPRESS OR IMPLIED WARRANTY OF ANY KIND. SUN MICROSYSTEMS, INC. DISCLAIMS
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16 * ALL WARRANTIES WITH REGARD TO SUCH SOURCE CODE, INCLUDING ALL IMPLIED
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17 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN
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18 * NO EVENT SHALL SUN MICROSYSTEMS, INC. BE LIABLE FOR ANY SPECIAL, INDIRECT,
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19 * INCIDENTAL, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
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20 * FROM USE OF SUCH SOURCE CODE, REGARDLESS OF THE THEORY OF LIABILITY.
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21 *
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22 * This source code is provided with no support and without any obligation on
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23 * the part of Sun Microsystems, Inc. to assist in its use, correction,
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24 * modification or enhancement.
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25 *
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26 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
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27 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY THIS
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28 * SOURCE CODE OR ANY PART THEREOF.
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29 *
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30 * Sun Microsystems, Inc.
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31 * 2550 Garcia Avenue
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32 * Mountain View, California 94043
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33 */
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34
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35 /*
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36 * Update the value of the `_edata' and `_end' symbols.
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37 */
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38 #pragma ident "@(#) $Id: _relocate.c,v 1.4 1998/03/31 20:10:55 steve Exp $ - SMI"
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39
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40 #include <libelf.h>
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41 #include <string.h>
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42 #include "machdep.h"
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43 #include "_dynodump.h"
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44
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45
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46 #define GETbyte(P) ((long)((unsigned long)(P)[0]))
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47 #define GEThalf(P) ((long)(((unsigned long)(P)[0] << 8) | \
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48 ((unsigned long)(P)[1])))
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49 #define GETword(P) ((long)(((unsigned long)(P)[0] << 24) | \
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50 ((unsigned long)(P)[1] << 16) | \
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51 ((unsigned long)(P)[2] << 8) | \
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52 (unsigned long)(P)[3]))
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53 #define GETdisp30(P) (GETword(P) & 0x3fffffff)
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54 #define GETdisp22(P) (GETword(P) & 0x3fffff)
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55 #define GETdisp16(P) (((GETword(P) & 0x300000) >> 6) | \
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56 (GETword(P) & 0x3fff))
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57 #define GETdisp19(P) (GETword(P) & 0x7ffff)
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58 #define GETimm22(P) (GETword(P) & 0x3fffff)
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59 #define GETimm5(P) (GEThalf((P)+2) & 0x1f)
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60 #define GETimm6(P) (GEThalf((P)+2) & 0x2f)
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61 #define GETimm7(P) (GEThalf((P)+2) & 0x3f)
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62 #define GETsimm13(P) (GEThalf((P)+2) & 0x1fff)
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63 #define GETsimm10(P) (GEThalf((P)+2) & 0x3ff)
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64 #define GETsimm11(P) (GEThalf((P)+2) & 0x7ff)
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65 #define GETplt22(P) (GETword((P)+8) & 0x3fffff)
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66
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67 #define PUTbyte(V, P) (P)[0] = (V)
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68 #define PUThalf(V, P) (P)[0] = ((V) >> 8); \
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69 (P)[1] = ((V))
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70 #define PUTword(V, P) (P)[0] = (unsigned char)((V) >> 24); \
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71 (P)[1] = (unsigned char)((V) >> 16); \
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72 (P)[2] = (unsigned char)((V) >> 8); \
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73 (P)[3] = (unsigned char)(V)
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74 #define PUTdisp30(V, P) { \
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75 unsigned long int temp; \
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76 temp = GETword(P) & ~0x3fffffff; \
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77 temp |= ((V) & 0x3fffffff); \
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78 PUTword(temp, P); \
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79 }
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80 #define PUTdisp22(V, P) { \
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81 unsigned long int temp; \
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82 temp = GETword(P) & ~0x3fffff; \
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83 temp |= ((V) & 0x3fffff); \
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84 PUTword(temp, P); \
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85 }
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86 #define PUTimm22(V, P) { \
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87 unsigned long int temp; \
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88 temp = GETword(P) & ~0x3fffff; \
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89 temp |= ((V) & 0x3fffff); \
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90 PUTword(temp, P); \
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91 }
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92 #define PUTimm5(V, P) { \
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93 unsigned long int temp; \
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94 temp = GEThalf(P+2) & ~0x1f; \
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95 temp |= ((V) & 0x1f); \
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96 PUThalf(temp, (P+2)); \
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97 }
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98 #define PUTimm6(V, P) { \
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99 unsigned long int temp; \
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100 temp = GEThalf(P+2) & ~0x2f; \
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101 temp |= ((V) & 0x2f); \
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102 PUThalf(temp, (P+2)); \
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103 }
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104 #define PUTimm7(V, P) { \
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105 unsigned long int temp; \
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106 temp = GEThalf(P+2) & ~0x3f; \
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107 temp |= ((V) & 0x3f); \
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108 PUThalf(temp, (P+2)); \
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109 }
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110 #define PUTsimm13(V, P) { \
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111 unsigned long int temp; \
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112 temp = GEThalf(P+2) & ~0x1fff; \
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113 temp |= ((V) & 0x1fff); \
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114 PUThalf(temp, (P+2)); \
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115 }
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116 #define PUTplt22(V, P) { \
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117 unsigned long int temp; \
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118 temp = GETword((P)+8) & ~0x3fffff; \
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119 temp |= ((V) & 0x3fffff); \
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120 PUTword(temp, ((P)+8)); \
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121 }
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122 #define PUTsimm10(V, P) { \
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123 unsigned long int temp; \
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124 temp = GEThalf(P+2) & ~0x3ff; \
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125 temp |= ((V) & 0x3ff); \
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126 PUThalf(temp, (P+2)); \
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127 }
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128 #define PUTsimm11(V, P) { \
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129 unsigned long int temp; \
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130 temp = GEThalf(P+2) & ~0x7ff; \
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131 temp |= ((V) & 0x7ff); \
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132 PUThalf(temp, (P+2)); \
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133 }
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134 #define PUTdisp16(V, P) { \
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135 unsigned long int temp; \
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136 temp = GETword(P) & ~0x303fff; \
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137 temp |= ((V) & 0xc000) << 6; \
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138 temp |= ((V) & 0x3fff); \
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139 PUTword(temp, P); \
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140 }
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141 #define PUTdisp19(V, P) { \
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142 unsigned long int temp; \
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143 temp = GETword(P) & ~0x7ffff; \
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144 temp |= ((V) & 0x7ffff); \
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145 PUTword(temp, P); \
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146 }
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147
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148 static void
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149 move_reloc(unsigned char * iaddr, unsigned char * oaddr, unsigned char type)
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150 {
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151 switch (type) {
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152 case R_SPARC_8:
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153 case R_SPARC_DISP8:
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154 PUTbyte(GETbyte(iaddr), oaddr);
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155 break;
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156
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157 case R_SPARC_16:
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158 case R_SPARC_DISP16:
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159 PUThalf(GEThalf(iaddr), oaddr);
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160 break;
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161
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162 case R_SPARC_32:
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163 case R_SPARC_DISP32:
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164 case R_SPARC_GLOB_DAT:
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165 case R_SPARC_RELATIVE:
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166 case R_SPARC_UA32:
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167 PUTword(GETword(iaddr), oaddr);
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168 break;
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169
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170 case R_SPARC_WDISP30:
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171 case R_SPARC_WPLT30:
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172 PUTdisp30(GETdisp30(iaddr), oaddr);
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173 break;
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174
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175 case R_SPARC_WDISP22:
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176 case R_SPARC_PC22:
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177 PUTdisp22(GETdisp22(iaddr), oaddr);
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178 break;
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179
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180 case R_SPARC_HI22:
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181 case R_SPARC_GOT22:
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182 case R_SPARC_22:
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183 PUTimm22(GETimm22(iaddr), oaddr);
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184 break;
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185
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186 case R_SPARC_13:
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187 case R_SPARC_GOT13:
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188 PUTsimm13(GETsimm13(iaddr), oaddr);
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189 break;
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190
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191 case R_SPARC_LO10:
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192 case R_SPARC_GOT10:
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193 case R_SPARC_PC10:
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194 #ifdef R_SPARC_10
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195 case R_SPARC_10:
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196 #endif
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197 PUTsimm10(GETsimm10(iaddr), oaddr);
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198 break;
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199
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200 #ifdef R_SPARC_11
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201 case R_SPARC_11:
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202 PUTsimm11(GETsimm11(iaddr), oaddr);
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203 break;
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204 #endif
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205
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206 #ifdef R_SPARC_WDISP16
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207 case R_SPARC_WDISP16:
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208 PUTdisp16(GETdisp16(iaddr), oaddr);
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209 break;
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210 #endif
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211
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212 #ifdef R_SPARC_WDISP19
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213 case R_SPARC_WDISP19:
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214 PUTdisp19(GETdisp19(iaddr), oaddr);
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215 break;
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216 #endif
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217
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218 #ifdef R_SPARC_5
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219 case R_SPARC_5:
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220 PUTimm5(GETimm5(iaddr), oaddr);
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221 break;
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222 #endif
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223
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224 #ifdef R_SPARC_6
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225 case R_SPARC_6:
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226 PUTimm6(GETimm6(iaddr), oaddr);
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227 break;
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228 #endif
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229
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230 #ifdef R_SPARC_7
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231 case R_SPARC_7:
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232 PUTimm7(GETimm7(iaddr), oaddr);
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233 break;
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234 #endif
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235
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236 default:
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237 break;
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238 }
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239 }
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240
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241 void
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242 update_reloc(Cache *ocache, Cache *_ocache,
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243 Cache *icache, Cache *_icache,
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244 Half shnum)
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245 {
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246 Shdr *shdr;
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247 Rel *rels;
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248 int reln, cnt;
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249 Cache *orcache, *ircache;
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250
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251 /*
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252 * Set up to read the output relocation table.
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253 */
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254 shdr = _ocache->c_shdr;
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255 rels = (Rel *)_ocache->c_data->d_buf;
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256 reln = shdr->sh_size / shdr->sh_entsize;
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257
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258 /*
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259 * Determine the section that is being relocated.
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260 */
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261 orcache = &ocache[shdr->sh_info];
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262 shdr = _icache->c_shdr;
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263 ircache = &icache[shdr->sh_info];
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264
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265 /*
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266 * Loop through the relocation table.
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267 */
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268 for (cnt = 0; cnt < reln; cnt++, rels++) {
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269 unsigned char *iaddr, *oaddr;
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270 Addr off;
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271 unsigned char type = ELF_R_TYPE(rels->r_info);
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272
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273 /*
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274 * Ignore some relocations as these can safely be carried out
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275 * twice (they simply override any existing data). In fact,
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276 * some relocations like __iob's copy relocation must be carried
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277 * out each time the process restarts otherwise stdio blows up.
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278 */
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279 if ((type == R_SPARC_COPY) || (type == R_SPARC_JMP_SLOT) ||
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280 (type == R_SPARC_NONE))
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281 continue;
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282
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283 /*
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284 * If we are required to restore the relocation location
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285 * to its value prior to relocation, then read the
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286 * locations original contents from the input image and
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287 * copy it to the output image.
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288 */
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289 off = rels->r_offset - ircache->c_shdr->sh_addr;
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290 iaddr = (unsigned char *)ircache->c_data->d_buf + off;
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291 oaddr = (unsigned char *)orcache->c_data->d_buf + off;
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292 move_reloc(iaddr, oaddr, type);
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293 }
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294 }
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