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0
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1 /* Unexec for MIPS (including IRIS4D).
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2 Copyright (C) 1988, 1992, 1993, 1994
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3 Free Software Foundation, Inc.
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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: FSF 19.31. */
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23
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24 #include <config.h>
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25 #include <sys/types.h>
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26 #include <sys/file.h>
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27 #include <sys/stat.h>
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28 #include <stdio.h>
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29 #include <varargs.h>
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30
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31 #ifdef MACH
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32
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33 #include <a.out.h>
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34
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35 /* I don't know why this isn't defined. */
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36 #ifndef STYP_INIT
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37 #define STYP_INIT 0x80000000
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38 #endif
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39
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40 /* I don't know why this isn't defined. */
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41 #ifndef _RDATA
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42 #define _RDATA ".rdata"
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43 #define STYP_RDATA 0x00000100
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44 #endif
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45
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46 /* Small ("near") data section. */
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47 #ifndef _SDATA
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48 #define _SDATA ".sdata"
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49 #define STYP_SDATA 0x00000200
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50 #endif
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51
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52 /* Small ("near") bss section. */
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53 #ifndef _SBSS
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54 #define _SBSS ".sbss"
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55 #define STYP_SBSS 0x00000400
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56 #endif
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57
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58 /* We don't seem to have a sym.h or syms.h anywhere, so we'll do it the
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59 hard way. This stinks. */
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60 typedef struct {
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61 short magic;
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62 short vstamp;
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63 long ilineMax;
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64 struct { long foo, offset; } offsets[11];
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65 } HDRR, *pHDRR;
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66
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67 #else /* not MACH */
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68
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69 #include <filehdr.h>
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70 #include <aouthdr.h>
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71 #include <scnhdr.h>
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72 #include <sym.h>
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73
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74 #endif /* not MACH */
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75
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76 #if defined (IRIS_4D) || defined (sony)
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77 #include "getpagesize.h"
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78 #include <fcntl.h>
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79 #endif
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80
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81 static void fatal_unexec ();
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82 static void mark_x ();
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83
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84 #define READ(_fd, _buffer, _size, _error_message, _error_arg) \
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85 errno = EEOF; \
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86 if (read (_fd, _buffer, _size) != _size) \
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87 fatal_unexec (_error_message, _error_arg);
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88
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89 #define WRITE(_fd, _buffer, _size, _error_message, _error_arg) \
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90 if (write (_fd, _buffer, _size) != _size) \
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91 fatal_unexec (_error_message, _error_arg);
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92
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93 #define SEEK(_fd, _position, _error_message, _error_arg) \
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94 errno = EEOF; \
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95 if (lseek (_fd, _position, L_SET) != _position) \
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96 fatal_unexec (_error_message, _error_arg);
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97
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98 extern int errno;
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99 extern char *strerror ();
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100 #define EEOF -1
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101
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102 static struct scnhdr *text_section;
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103 static struct scnhdr *init_section;
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104 static struct scnhdr *finit_section;
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105 static struct scnhdr *rdata_section;
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106 static struct scnhdr *data_section;
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107 static struct scnhdr *lit8_section;
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108 static struct scnhdr *lit4_section;
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109 static struct scnhdr *sdata_section;
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110 static struct scnhdr *sbss_section;
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111 static struct scnhdr *bss_section;
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112
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113 struct headers {
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114 struct filehdr fhdr;
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115 struct aouthdr aout;
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116 struct scnhdr section[10];
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117 };
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118
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119 /* Define name of label for entry point for the dumped executable. */
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120
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121 #ifndef DEFAULT_ENTRY_ADDRESS
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122 #define DEFAULT_ENTRY_ADDRESS __start
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123 #endif
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124
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125 unexec (new_name, a_name, data_start, bss_start, entry_address)
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126 char *new_name, *a_name;
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127 unsigned data_start, bss_start, entry_address;
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128 {
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129 int new, old;
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130 int pagesize, brk;
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131 int newsyms, symrel;
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132 int nread;
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133 struct headers hdr;
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134 int i;
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135 int vaddr, scnptr;
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136 #define BUFSIZE 8192
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137 char buffer[BUFSIZE];
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138
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139 old = open (a_name, O_RDONLY, 0);
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140 if (old < 0) fatal_unexec ("opening %s", a_name);
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141
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142 new = creat (new_name, 0666);
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143 if (new < 0) fatal_unexec ("creating %s", new_name);
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144
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145 hdr = *((struct headers *)TEXT_START);
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146 #ifdef MIPS2
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147 if (hdr.fhdr.f_magic != MIPSELMAGIC
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148 && hdr.fhdr.f_magic != MIPSEBMAGIC
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149 && hdr.fhdr.f_magic != (MIPSELMAGIC | 1)
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150 && hdr.fhdr.f_magic != (MIPSEBMAGIC | 1))
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151 {
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152 fprintf (stderr,
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153 "unexec: input file magic number is %x, not %x, %x, %x or %x.\n",
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154 hdr.fhdr.f_magic,
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155 MIPSELMAGIC, MIPSEBMAGIC,
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156 MIPSELMAGIC | 1, MIPSEBMAGIC | 1);
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157 exit(1);
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158 }
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159 #else /* not MIPS2 */
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160 if (hdr.fhdr.f_magic != MIPSELMAGIC
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161 && hdr.fhdr.f_magic != MIPSEBMAGIC)
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162 {
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163 fprintf (stderr, "unexec: input file magic number is %x, not %x or %x.\n",
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164 hdr.fhdr.f_magic, MIPSELMAGIC, MIPSEBMAGIC);
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165 exit (1);
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166 }
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167 #endif /* not MIPS2 */
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168 if (hdr.fhdr.f_opthdr != sizeof (hdr.aout))
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169 {
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170 fprintf (stderr, "unexec: input a.out header is %d bytes, not %d.\n",
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171 hdr.fhdr.f_opthdr, sizeof (hdr.aout));
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172 exit (1);
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173 }
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174 if (hdr.aout.magic != ZMAGIC)
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175 {
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176 fprintf (stderr, "unexec: input file a.out magic number is %o, not %o.\n",
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177 hdr.aout.magic, ZMAGIC);
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178 exit (1);
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179 }
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180
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181 #define CHECK_SCNHDR(ptr, name, flags) \
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182 ptr = NULL; \
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183 for (i = 0; i < hdr.fhdr.f_nscns && !ptr; i++) \
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184 if (strcmp (hdr.section[i].s_name, name) == 0) \
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185 { \
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186 if (hdr.section[i].s_flags != flags) \
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187 fprintf (stderr, "unexec: %x flags (%x expected) in %s section.\n", \
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188 hdr.section[i].s_flags, flags, name); \
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189 ptr = hdr.section + i; \
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190 }
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191
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192 CHECK_SCNHDR (text_section, _TEXT, STYP_TEXT);
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193 CHECK_SCNHDR (init_section, _INIT, STYP_INIT);
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194 CHECK_SCNHDR (rdata_section, _RDATA, STYP_RDATA);
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195 CHECK_SCNHDR (data_section, _DATA, STYP_DATA);
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196 #ifdef _LIT8
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197 CHECK_SCNHDR (lit8_section, _LIT8, STYP_LIT8);
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198 CHECK_SCNHDR (lit4_section, _LIT4, STYP_LIT4);
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199 #endif /* _LIT8 */
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200 CHECK_SCNHDR (sdata_section, _SDATA, STYP_SDATA);
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201 CHECK_SCNHDR (sbss_section, _SBSS, STYP_SBSS);
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202 CHECK_SCNHDR (bss_section, _BSS, STYP_BSS);
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203 #if 0 /* Apparently this error check goes off on irix 3.3,
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204 but it doesn't indicate a real problem. */
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205 if (i != hdr.fhdr.f_nscns)
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206 fprintf (stderr, "unexec: %d sections found instead of %d.\n",
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207 i, hdr.fhdr.f_nscns);
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208 #endif
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209
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210 text_section->s_scnptr = 0;
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211
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212 pagesize = getpagesize ();
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213 /* Casting to int avoids compiler error on NEWS-OS 5.0.2. */
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214 brk = (((int) (sbrk (0))) + pagesize - 1) & (-pagesize);
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215 hdr.aout.dsize = brk - DATA_START;
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216 hdr.aout.bsize = 0;
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217 if (entry_address == 0)
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218 {
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219 extern DEFAULT_ENTRY_ADDRESS ();
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220 hdr.aout.entry = (unsigned)DEFAULT_ENTRY_ADDRESS;
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221 }
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222 else
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223 hdr.aout.entry = entry_address;
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224
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225 hdr.aout.bss_start = hdr.aout.data_start + hdr.aout.dsize;
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226 rdata_section->s_size = data_start - DATA_START;
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227
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228 /* Adjust start and virtual addresses of rdata_section, too. */
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229 rdata_section->s_vaddr = DATA_START;
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230 rdata_section->s_paddr = DATA_START;
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231 rdata_section->s_scnptr = text_section->s_scnptr + hdr.aout.tsize;
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232
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233 data_section->s_vaddr = data_start;
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234 data_section->s_paddr = data_start;
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235 data_section->s_size = brk - data_start;
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236 data_section->s_scnptr = rdata_section->s_scnptr + rdata_section->s_size;
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237 vaddr = data_section->s_vaddr + data_section->s_size;
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238 scnptr = data_section->s_scnptr + data_section->s_size;
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239 if (lit8_section != NULL)
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240 {
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241 lit8_section->s_vaddr = vaddr;
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242 lit8_section->s_paddr = vaddr;
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243 lit8_section->s_size = 0;
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244 lit8_section->s_scnptr = scnptr;
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245 }
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246 if (lit4_section != NULL)
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247 {
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248 lit4_section->s_vaddr = vaddr;
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249 lit4_section->s_paddr = vaddr;
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250 lit4_section->s_size = 0;
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251 lit4_section->s_scnptr = scnptr;
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252 }
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253 if (sdata_section != NULL)
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254 {
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255 sdata_section->s_vaddr = vaddr;
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256 sdata_section->s_paddr = vaddr;
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257 sdata_section->s_size = 0;
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258 sdata_section->s_scnptr = scnptr;
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259 }
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260 if (sbss_section != NULL)
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261 {
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262 sbss_section->s_vaddr = vaddr;
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263 sbss_section->s_paddr = vaddr;
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264 sbss_section->s_size = 0;
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265 sbss_section->s_scnptr = scnptr;
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266 }
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267 if (bss_section != NULL)
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268 {
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269 bss_section->s_vaddr = vaddr;
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270 bss_section->s_paddr = vaddr;
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271 bss_section->s_size = 0;
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272 bss_section->s_scnptr = scnptr;
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273 }
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274
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275 WRITE (new, (void *) TEXT_START, hdr.aout.tsize,
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276 "writing text section to %s", new_name);
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277 WRITE (new, (void *) DATA_START, hdr.aout.dsize,
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278 "writing data section to %s", new_name);
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279
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280 SEEK (old, hdr.fhdr.f_symptr, "seeking to start of symbols in %s", a_name);
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281 errno = EEOF;
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282 nread = read (old, buffer, BUFSIZE);
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283 if (nread < sizeof (HDRR)) fatal_unexec ("reading symbols from %s", a_name);
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284 newsyms = hdr.aout.tsize + hdr.aout.dsize;
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285 symrel = newsyms - hdr.fhdr.f_symptr;
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286 hdr.fhdr.f_symptr = newsyms;
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287 #define symhdr ((pHDRR)buffer)
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288 #ifdef MACH
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289 for (i = 0; i < 11; i++)
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290 symhdr->offsets[i].offset += symrel;
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291 #else
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292 symhdr->cbLineOffset += symrel;
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293 symhdr->cbDnOffset += symrel;
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294 symhdr->cbPdOffset += symrel;
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295 symhdr->cbSymOffset += symrel;
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296 symhdr->cbOptOffset += symrel;
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297 symhdr->cbAuxOffset += symrel;
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298 symhdr->cbSsOffset += symrel;
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299 symhdr->cbSsExtOffset += symrel;
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300 symhdr->cbFdOffset += symrel;
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301 symhdr->cbRfdOffset += symrel;
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302 symhdr->cbExtOffset += symrel;
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303 #endif
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304 #undef symhdr
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305 do
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306 {
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307 if (write (new, buffer, nread) != nread)
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308 fatal_unexec ("writing symbols to %s", new_name);
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309 nread = read (old, buffer, BUFSIZE);
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310 if (nread < 0) fatal_unexec ("reading symbols from %s", a_name);
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311 #undef BUFSIZE
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312 } while (nread != 0);
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313
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314 SEEK (new, 0, "seeking to start of header in %s", new_name);
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315 WRITE (new, &hdr, sizeof (hdr),
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316 "writing header of %s", new_name);
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317
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318 close (old);
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319 close (new);
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320 mark_x (new_name);
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321 }
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322
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323 /*
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324 * mark_x
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325 *
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326 * After successfully building the new a.out, mark it executable
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327 */
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328
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329 static void
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330 mark_x (name)
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331 char *name;
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332 {
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333 struct stat sbuf;
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334 int um = umask (777);
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335 umask (um);
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336 if (stat (name, &sbuf) < 0)
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337 fatal_unexec ("getting protection on %s", name);
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338 sbuf.st_mode |= 0111 & ~um;
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339 if (chmod (name, sbuf.st_mode) < 0)
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340 fatal_unexec ("setting protection on %s", name);
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341 }
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342
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343 static void
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344 fatal_unexec (s, va_alist)
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345 va_dcl
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346 {
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347 va_list ap;
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348 if (errno == EEOF)
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349 fputs ("unexec: unexpected end of file, ", stderr);
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350 else
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351 fprintf (stderr, "unexec: %s, ", strerror (errno));
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352 va_start (ap);
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353 _doprnt (s, ap, stderr);
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354 fputs (".\n", stderr);
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355 exit (1);
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356 }
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