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0
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1 /* Dump Emacs in macho format.
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2 Copyright (C) 1990-1993 Free Software Foundation, Inc.
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3 Written by Bradley Taylor (btaylor@next.com).
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4
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5 This file is part of XEmacs.
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6
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7 XEmacs is free software; you can redistribute it and/or modify it
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8 under the terms of the GNU General Public License as published by the
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9 Free Software Foundation; either version 2, or (at your option) any
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10 later version.
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11
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12 XEmacs 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
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15 for more details.
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16
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17 You should have received a copy of the GNU General Public License
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18 along with XEmacs; see the file COPYING. If not, write to
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19 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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20 Boston, MA 02111-1307, USA. */
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21
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22 /* Synched up with: NeXT port */
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23
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24 #include <stdio.h>
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25 #include <libc.h>
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26 #include <nlist.h>
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27 #include <mach/mach.h>
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28 #include <mach-o/ldsyms.h>
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29 #include <mach-o/loader.h>
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30
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31 int malloc_cookie;
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32
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33 static void fatal_unexec(char *format, ...)
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34 {
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35 va_list ap;
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36
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37 va_start(ap, format);
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38 fprintf(stderr, "unexec: ");
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39 vfprintf(stderr, format, ap);
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40 fprintf(stderr, "\n");
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41 va_end(ap);
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42 exit(1);
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43 }
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44
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45 static void mcopy(int ffd,int tfd,
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46 unsigned long fpos,unsigned long tpos,unsigned long len)
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47 {
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48 if ((ffd==-1)&&(tfd==-1))
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49 {
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50 char *f,*t,*e;
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51 if (fpos>tpos)
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52 {
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53 f=(char *)fpos;
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54 t=(char *)tpos;
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55 e=(char *)(fpos+len);
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56 while(f<e) *t++=*f++;
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57 }
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58 else if (tpos>fpos)
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59 {
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60 f=(char *)(fpos+len);
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61 t=(char *)(tpos+len);
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62 e=(char *)fpos;
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63 while(f>e) *--t=*--f;
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64 }
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65 }
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66 else if (ffd==-1)
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67 {
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68 if (lseek(tfd,tpos,L_SET)<0)
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69 fatal_unexec("cannot seek target");
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70 if (write(tfd,(void *)fpos,len)!=len)
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71 fatal_unexec("cannot write target");
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72 }
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73 else if (tfd==-1)
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74 {
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75 if (lseek(ffd,fpos,L_SET)<0)
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76 fatal_unexec("cannot seek source");
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77 if (read(ffd,(void *)tpos,len)!=len)
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78 fatal_unexec("cannot read source");
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79 }
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80 else
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81 {
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82 int bread;
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83 char *buf=alloca(1<<16);
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84
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85 if (lseek(ffd,fpos,L_SET)<0)
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86 fatal_unexec("cannot seek source");
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87
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88 if (lseek(tfd,tpos,L_SET)<0)
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89 fatal_unexec("cannot seek target");
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90
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91 while((len>0) && (bread=read(ffd,buf,MIN(1<<16,len)))>0)
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92 {
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93 if (bread<0)
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94 fatal_unexec("cannot read source");
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95 if (write(tfd,buf,bread)!=bread)
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96 fatal_unexec("cannot write target");
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97 len-=bread;
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98 }
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99 }
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100 }
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101
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102 static void unexec_doit(int infd,int outfd)
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103 {
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104 int i,j,hpos,opos;
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105 extern int malloc_freezedry(void);
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106 struct region
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107 {
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108 struct region *next;
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109 unsigned long addr;
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110 unsigned long size;
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111 vm_prot_t prot;
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112 vm_prot_t mprot;
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113 } *regions=0,*cregion,**pregions;
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114 struct mach_header mh;
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115 struct segment_command *lc,*sp;
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116 struct symtab_command *st;
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117 struct section *sect;
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118
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119 malloc_cookie=malloc_freezedry();
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120
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121 {
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122 vm_task_t task=task_self();
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123 vm_address_t addr;
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124 vm_size_t size;
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125 vm_prot_t prot,mprot;
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126 vm_inherit_t inhe;
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127 boolean_t shrd;
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128 port_t name;
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129 vm_offset_t offset;
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130
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131 for(addr=VM_MIN_ADDRESS,pregions=®ions;
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132 vm_region(task,&addr,&size,&prot,&mprot,
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133 &inhe,&shrd,&name,&offset)==KERN_SUCCESS;
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134 addr += size)
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135 {
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136 (*pregions)=alloca(sizeof(struct region));
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137 (*pregions)->addr=addr;
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138 (*pregions)->size=size;
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139 (*pregions)->prot=prot;
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140 (*pregions)->mprot=mprot;
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141 (*pregions)->next=0;
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142 pregions=&((*pregions)->next);
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143 }
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144 }
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145
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146 for(cregion=regions;cregion;cregion=cregion->next)
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147 while ((cregion->next) &&
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148 (cregion->next->addr==cregion->addr+cregion->size) &&
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149 (cregion->next->prot==cregion->prot) &&
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150 (cregion->next->mprot==cregion->mprot))
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151 {
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152 cregion->size += cregion->next->size;
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153 cregion->next = cregion->next->next;
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154 }
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155
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156 mcopy(infd,-1,0,(unsigned long) &mh,sizeof(mh));
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157 lc=alloca(mh.sizeofcmds);
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158 mcopy(infd,-1,sizeof(mh),(unsigned long) lc,mh.sizeofcmds);
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159
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160 for(pregions=®ions;*pregions;)
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161 {
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162 if (!((*pregions)->prot&VM_PROT_WRITE)
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163 || ((*pregions)->addr>=0x3000000))
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164 goto kill_region;
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165
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166 for(sp=lc,i=0;
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167 i<mh.ncmds;
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168 i++,sp=(struct segment_command *)(((char *)sp)+sp->cmdsize))
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169 {
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170 unsigned long ob,oe;
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171 if (sp->cmd!=LC_SEGMENT||(strcmp(sp->segname,SEG_DATA)==0)) continue;
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172 ob=MAX((*pregions)->addr,sp->vmaddr);
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173 oe=MIN((*pregions)->addr+(*pregions)->size,sp->vmaddr+sp->vmsize);
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174 if (ob >= oe) continue;
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175 if (ob==(*pregions)->addr)
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176 if (oe==(*pregions)->addr+(*pregions)->size)
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177 {
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178 goto kill_region;
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179 }
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180 else
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181 {
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182 (*pregions)->addr=oe;
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183 (*pregions)->size-=(oe-ob);
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184 }
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185 else
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186 if (oe==(*pregions)->addr+(*pregions)->size)
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187 {
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188 (*pregions)->size-=(oe-ob);
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189 }
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190 else
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191 {
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192 cregion=alloca(sizeof(*cregion));
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193 cregion->addr=oe;
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194 cregion->size=((*pregions)->addr+(*pregions)->size)-oe;
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195 cregion->prot=(*pregions)->prot;
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196 cregion->mprot=(*pregions)->mprot;
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197 cregion->next=(*pregions)->next;
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198 (*pregions)->size=ob-(*pregions)->addr;
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199 (*pregions)->next=cregion;
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200 }
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201 }
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202 pregions=&((*pregions)->next);
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203 continue;
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204 kill_region:
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205 *pregions=(*pregions)->next;
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206 }
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207
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208 for(sp=lc,i=mh.ncmds,hpos=sizeof(mh),opos=0;
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209 i>0;
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210 i--,sp=(struct segment_command *)(((char *)sp)+sp->cmdsize))
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211 switch (sp->cmd)
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212 {
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213 case LC_SEGMENT:
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214 if (strcmp(sp->segname,SEG_DATA)==0)
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215 {
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216 mh.ncmds--;
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217 j=sp->cmdsize;
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218 while (regions)
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219 {
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220 mcopy(-1,outfd,regions->addr,opos,regions->size);
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221 sp->cmd=LC_SEGMENT;
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222 sp->cmdsize=sizeof(*sp);
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223 strncpy(sp->segname,SEG_DATA,sizeof(sp->segname));
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224 sp->vmaddr=regions->addr;
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225 sp->vmsize=regions->size;
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226 sp->filesize=regions->size;
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227 sp->maxprot=regions->prot;
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228 sp->initprot=regions->mprot;
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229 sp->nsects=0;
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230 sp->flags=0;
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231 sp->fileoff=opos;
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232 opos+=sp->filesize;
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233 mcopy(-1,outfd,(unsigned long)sp,hpos,sp->cmdsize);
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234 hpos+=sp->cmdsize;
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235 mh.ncmds++;
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236 regions=regions->next;
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237 }
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238 sp->cmdsize=j;
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239 regions=0;
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240 }
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241 else if (strcmp(sp->segname,SEG_LINKEDIT)==0)
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242 {
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243 mh.ncmds--;
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244 }
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245 else
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246 {
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247 mcopy(infd,outfd,sp->fileoff,opos,sp->filesize);
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248 sect=(struct section *) (((char *)sp)+sizeof(*sp));
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249 for(j=0;j<sp->nsects;j++)
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250 {
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251 if (sect[j].offset!=0)
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252 sect[j].offset=(sect[j].offset-sp->fileoff)+opos;
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253 if (sect[j].reloff!=0)
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254 sect[j].reloff=(sect[j].reloff-sp->fileoff)+opos;
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255 }
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256 sp->fileoff=opos;
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257 opos+=sp->filesize;
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258 mcopy(-1,outfd,(unsigned long)sp,hpos,sp->cmdsize);
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259 hpos+=sp->cmdsize;
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260 }
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261 break;
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262 case LC_SYMTAB:
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263 st=(struct symtab_command *)sp;
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264
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265 mcopy(infd,outfd,st->symoff,opos,st->nsyms*sizeof(struct nlist));
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266 st->symoff=opos;
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267 opos+=sizeof(struct nlist)*st->nsyms;
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268
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269 mcopy(infd,outfd,st->stroff,opos,st->strsize);
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270 ((struct symtab_command *)sp)->stroff=opos;
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271 opos+=((struct symtab_command *)sp)->strsize;
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272 default:
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273 mcopy(-1,outfd,(unsigned long)sp,hpos,sp->cmdsize);
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274 hpos+=sp->cmdsize;
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275 }
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276 mh.sizeofcmds=hpos-sizeof(mh);
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277 mcopy(-1,outfd,(unsigned long) &mh,0,sizeof(mh));
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278 }
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279
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280 void unexec(char *outfile,char *infile)
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281 {
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771
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282 char tmpfile[PATH_MAX];
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0
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283 int infd,outfd;
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284
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285 if ((infd=open(infile, O_RDONLY, 0))<0)
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286 fatal_unexec("cannot open input file `%s'", infile);
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287
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288 strcpy(tmpfile,outfile);
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289 strcat(tmpfile,"-temp");
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290
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291 if ((outfd=open(tmpfile, O_RDWR|O_TRUNC|O_CREAT, 0755))<0)
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292 fatal_unexec("cannot open temporary output file `%s'",tmpfile);
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293
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294 unexec_doit(infd,outfd);
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295
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296 close(infd);
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297 close(outfd);
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298 if (rename(tmpfile, outfile)<0)
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299 {
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300 unlink(tmpfile);
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301 fatal_unexec("cannot rename `%s' to `%s'", tmpfile, outfile);
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302 }
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303 }
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