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613
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1 /* unexapollo.c -- COFF File UNEXEC for XEmacs on Apollo SR10.x
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428
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2 Copyright (C) 1988, 1994 Free Software Foundation, Inc.
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3
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613
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4 This file is part of XEmacs.
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428
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5
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613
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6 XEmacs is free software; you can redistribute it and/or modify
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428
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7 it under the terms of the GNU General Public License as published by
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8 the Free Software Foundation; either version 2, or (at your option)
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9 any later version.
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10
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613
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11 XEmacs is distributed in the hope that it will be useful,
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428
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12 but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 GNU General Public License for more details.
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15
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16 You should have received a copy of the GNU General Public License
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613
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17 along with XEmacs; see the file COPYING. If not, write to
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428
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18 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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19 Boston, MA 02111-1307, USA. */
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20
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21 /* Synched up with: FSF 19.31. */
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22
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23 /* Written by Leonard N. Zubkoff. */
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24
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25 #include <config.h>
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26 #include <fcntl.h>
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27
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28
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29 #include <a.out.h>
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30 #include <sys/file.h>
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31 #include <apollo/base.h>
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32 #include <apollo/ios.h>
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33 #include <apollo/type_uids.h>
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34 #include <apollo/dst.h>
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35
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36
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37 #define DST_RECORD_HDR_SIZE 2
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38 #define LONG_ALIGN(X) (((X)+3)&(~3))
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39
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40
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41 void
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42 unexec (target_file_name, source_file_name)
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43 char *target_file_name, *source_file_name;
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44 {
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45 struct filehdr file_header;
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46 struct aouthdr domain_header;
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47 struct scnhdr *section, *sections, *sections_limit;
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48 struct scnhdr *first_data_section, *last_data_section;
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49 struct scnhdr *rwdi_section, *blocks_section;
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50 struct reloc reloc_entry;
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51 unsigned long data_size, old_data_section_size, source_file_offset_past_rwdi;
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52 unsigned char buffer[4096];
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53 long delta_before_rwdi, delta_after_rwdi, byte_count;
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54 long first_changed_vaddr, old_rwdi_vaddr, i;
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55 ios_$id_t target_file, source_file;
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56 status_$t status;
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57 /* Open the Source File. */
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58 if ((source_file = open (source_file_name, O_RDONLY)) < 0)
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563
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59 signal_error (Qfile_error, "cannot open source file for input", Qunbound);
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428
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60 /* Read the File Header. */
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61 if (read (source_file, &file_header, sizeof (file_header)) != sizeof (file_header))
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563
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62 signal_error (Qfile_error, "cannot read file header", Qunbound);
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428
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63
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64 /* Read the Domain Header. */
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65 if (read (source_file, &domain_header, sizeof (domain_header))
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66 != sizeof (domain_header))
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563
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67 signal_error (Qfile_error, "cannot read domain header", Qunbound);
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428
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68 /* Read the Section Headers. */
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69 sections =
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70 (struct scnhdr *) malloc (file_header.f_nscns*sizeof (struct scnhdr));
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71 if (sections == (struct scnhdr *) 0)
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563
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72 out_of_memory ("cannot allocate section header storage", Qunbound);
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428
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73 sections_limit = sections + file_header.f_nscns;
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74 if (read (source_file, sections, file_header.f_nscns*sizeof (struct scnhdr))
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75 != file_header.f_nscns*sizeof (struct scnhdr))
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563
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76 signal_error (Qfile_error, "cannot read section headers", Qunbound);
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428
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77 /* Compute the new Size of the Data Section. */
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78 data_size = sbrk (0) - domain_header.data_start;
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79 delta_before_rwdi = delta_after_rwdi = data_size - domain_header.dsize;
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80 old_rwdi_vaddr = 0;
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81 /* Find and Deallocate the .rwdi Section Information. */
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82 for (rwdi_section = sections; rwdi_section != sections_limit; rwdi_section++)
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83 if (strcmp (rwdi_section->s_name, ".rwdi") == 0)
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84 {
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85 /* If there are relocation entries, we cannot "unrelocate" them. */
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86 if (rwdi_section->s_nreloc > 0)
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563
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87 signal_error (Qio_error, ".rwdi section needs relocation - cannot dump Emacs", Qunbound);
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428
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88 delta_after_rwdi = delta_before_rwdi - rwdi_section->s_size;
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89 old_rwdi_vaddr = rwdi_section->s_vaddr;
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90 rwdi_section->s_paddr = 0;
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91 rwdi_section->s_vaddr = 0;
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92 rwdi_section->s_scnptr = 0;
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93 rwdi_section->s_size = 0;
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94 source_file_offset_past_rwdi = (rwdi_section+1)->s_scnptr;
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95 break;
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96 }
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97 /* Skip over the Text Section Headers. */
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98 for (section = sections; (section->s_flags & STYP_TEXT) != 0; section++) ;
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99 /*
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100 Find the First and Last Data Sections and Fixup
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101 Section Header Relocation Pointers.
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102 */
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103 first_data_section = last_data_section = (struct scnhdr *) 0;
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104 for (; section != sections_limit; section++)
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105 {
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106 if ((section->s_flags & STYP_DATA) != 0)
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107 {
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108 if (first_data_section == (struct scnhdr *) 0)
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109 first_data_section = section;
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110 last_data_section = section;
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111 }
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112 if (section->s_relptr != 0)
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113 section->s_relptr += delta_after_rwdi;
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114 }
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115 /* Increment the Size of the Last Data Section. */
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116 old_data_section_size = last_data_section->s_size;
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117 last_data_section->s_size += delta_before_rwdi;
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118
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119 /* Update the File Header and Domain Header. */
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120 file_header.f_symptr += delta_after_rwdi;
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121 domain_header.dsize = data_size;
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122 domain_header.bsize = 0;
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123 /* Skip over subsequent Bss Section Headers. */
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124 for (section = last_data_section+1;
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125 (section->s_flags & STYP_BSS) != 0; section++) ;
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126 /* Update the remaining Section Headers. */
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127 blocks_section = (struct scnhdr *) 0;
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128 first_changed_vaddr = 0;
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129 for (; section != sections_limit; section++)
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130 {
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131 long delta = (section < rwdi_section ? delta_before_rwdi : delta_after_rwdi);
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132 if (section->s_paddr != 0)
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133 section->s_paddr += delta;
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134 if (section->s_vaddr != 0)
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135 {
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136 if (first_changed_vaddr == 0)
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137 first_changed_vaddr = section->s_vaddr;
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138 section->s_vaddr += delta;
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139 }
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140 if (section->s_scnptr != 0)
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141 section->s_scnptr += delta;
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142 if (strcmp (section->s_name, ".blocks") == 0)
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143 blocks_section = section;
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144 else if (strcmp (section->s_name, ".sri") == 0 &&
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145 domain_header.o_sri != 0)
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146 domain_header.o_sri += delta;
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147 else if (strcmp (section->s_name, ".inlib") == 0 &&
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148 domain_header.o_inlib != 0)
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149 domain_header.o_inlib += delta;
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150 }
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151 /* Open the Target File. */
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152 ios_$create (target_file_name, strlen (target_file_name), coff_$uid,
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153 ios_$recreate_mode, ios_$write_opt, &target_file, &status);
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154 if (status.all != status_$ok)
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563
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155 signal_error (Qfile_error, "cannot open target file for output", Qunbound);
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428
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156 /* Write the File Header. */
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157 if (write (target_file, &file_header, sizeof (file_header)) != sizeof (file_header))
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563
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158 signal_error (Qfile_error, "cannot write file header", Qunbound);
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428
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159 /* Write the Domain Header. */
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160 if (write (target_file, &domain_header, sizeof (domain_header))
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161 != sizeof (domain_header))
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563
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162 signal_error (Qfile_error, "cannot write domain header", Qunbound);
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428
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163 /* Write the Section Headers. */
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164 if (write (target_file, sections, file_header.f_nscns*sizeof (struct scnhdr))
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165 != file_header.f_nscns*sizeof (struct scnhdr))
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563
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166 signal_error (Qfile_error, "cannot write section headers", Qunbound);
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428
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167 /* Copy the Allocated Sections. */
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168 for (section = sections; section != first_data_section; section++)
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169 if (section->s_scnptr != 0)
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170 CopyData (target_file, source_file, LONG_ALIGN(section->s_size));
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171 /* Write the Expanded Data Segment. */
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172 if (write (target_file, first_data_section->s_vaddr, data_size) != data_size)
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563
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173 signal_error (Qfile_error, "cannot write new data section", Qunbound);
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428
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174
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175 /* Skip over the Last Data Section and Copy until the .rwdi Section. */
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176 if (lseek (source_file, last_data_section->s_scnptr
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177 +old_data_section_size, L_SET) == -1)
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563
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178 signal_error (Qfile_error, "cannot seek past data section", Qunbound);
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428
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179 for (section = last_data_section+1; section != rwdi_section; section++)
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180 if (section->s_scnptr != 0)
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181 CopyData (target_file, source_file, LONG_ALIGN(section->s_size));
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182 /* Skip over the .rwdi Section and Copy Remainder of Source File. */
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183 if (lseek (source_file, source_file_offset_past_rwdi, L_SET) == -1)
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563
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184 signal_error (Qfile_error, "cannot seek past .rwdi section", Qunbound);
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428
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185 while ((byte_count = read (source_file, buffer, sizeof (buffer))) > 0)
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186 if (write (target_file, buffer, byte_count) != byte_count)
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563
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187 signal_error (Qfile_error, "cannot write data", Qunbound);
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428
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188 /* Unrelocate .data references to Global Symbols. */
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189 for (section = first_data_section; section <= last_data_section; section++)
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190 for (i = 0; i < section->s_nreloc; i++)
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191 {
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192 if (lseek (source_file, section->s_relptr
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193 +i*sizeof (struct reloc)-delta_after_rwdi, L_SET) == -1)
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563
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194 signal_error (Qfile_error, "cannot seek to relocation info", Qunbound);
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428
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195 if (read (source_file, &reloc_entry, sizeof (reloc_entry))
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196 != sizeof (reloc_entry))
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563
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197 signal_error (Qfile_error, "cannot read reloc entry", Qunbound);
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428
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198 if (lseek (source_file, reloc_entry.r_vaddr-section->s_vaddr
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199 +section->s_scnptr, L_SET) == -1)
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563
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200 signal_error (Qfile_error, "cannot seek to data element", Qunbound);
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428
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201 if (lseek (target_file, reloc_entry.r_vaddr-section->s_vaddr
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202 +section->s_scnptr, L_SET) == -1)
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563
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203 signal_error (Qfile_error, "cannot seek to data element", Qunbound);
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428
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204 if (read (source_file, buffer, 4) != 4)
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563
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205 signal_error (Qfile_error, "cannot read data element", Qunbound);
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428
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206 if (write (target_file, buffer, 4) != 4)
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563
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207 signal_error (Qfile_error, "cannot write data element", Qunbound);
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428
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208 }
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209
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210 /* Correct virtual addresses in .blocks section. */
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211 if (blocks_section != (struct scnhdr *) 0)
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212 {
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213 dst_rec_t dst_record;
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214 dst_rec_comp_unit_t *comp_unit;
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215 unsigned short number_of_sections;
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216 unsigned long section_base;
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217 unsigned long section_offset = 0;
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218 /* Find section tables and update section base addresses. */
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219 while (section_offset < blocks_section->s_size)
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220 {
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221 if (lseek (target_file,
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222 blocks_section->s_scnptr+section_offset, L_SET) == -1)
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563
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223 signal_error (Qfile_error, "cannot seek to comp unit record", Qunbound);
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428
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224 /* Handle pad records before the comp unit record. */
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225 if (read (target_file, &dst_record, DST_RECORD_HDR_SIZE)
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226 != DST_RECORD_HDR_SIZE)
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563
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227 signal_error (Qfile_error, "cannot read dst record tag", Qunbound);
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428
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228 if (dst_record.rec_type == dst_typ_pad)
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229 section_offset += DST_RECORD_HDR_SIZE;
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230 else if (dst_record.rec_type == dst_typ_comp_unit)
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231 {
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232 comp_unit = &dst_record.rec_data.comp_unit_;
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233 if (read (target_file, comp_unit, sizeof (*comp_unit))
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234 != sizeof (*comp_unit))
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563
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235 signal_error (Qfile_error, "cannot read comp unit record", Qunbound);
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428
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236 if (lseek (target_file, blocks_section->s_scnptr
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237 +section_offset
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238 #if dst_version_major == 1 && dst_version_minor < 4
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239 +comp_unit->section_table
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240 #else
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241 +comp_unit->section_table.rel_offset
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242 #endif
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243 +DST_RECORD_HDR_SIZE,
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244 L_SET) == -1)
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563
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245 signal_error (Qfile_error, "cannot seek to section table", Qunbound);
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428
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246 if (read (target_file, &number_of_sections, sizeof (number_of_sections))
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247 != sizeof (number_of_sections))
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563
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248 signal_error (Qfile_error, "cannot read section table size", Qunbound);
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428
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249 for (i = 0; i < number_of_sections; i++)
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250 {
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251 if (read (target_file, §ion_base, sizeof (section_base))
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252 != sizeof (section_base))
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563
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253 signal_error (Qfile_error, "cannot read section base value", Qunbound);
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428
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254 if (section_base < first_changed_vaddr)
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255 continue;
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256 else if (section_base < old_rwdi_vaddr)
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257 section_base += delta_before_rwdi;
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258 else section_base += delta_after_rwdi;
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259 if (lseek (target_file, -sizeof (section_base), L_INCR) == -1)
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563
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260 signal_error (Qfile_error, "cannot seek to section base value", Qunbound);
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428
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261 if (write (target_file, §ion_base, sizeof (section_base))
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262 != sizeof (section_base))
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563
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263 signal_error (Qfile_error, "cannot write section base", Qunbound);
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428
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264 }
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265 section_offset += comp_unit->data_size;
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266 }
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563
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267 else signal_error (Qfile_error, "unexpected dst record type", Qunbound);
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428
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268 }
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269 }
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270
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271 if (close (source_file) == -1)
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563
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272 signal_error (Qfile_error, "cannot close source file", Qunbound);
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428
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273 if (close (target_file) == -1)
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563
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274 signal_error (Qfile_error, "cannot close target file", Qunbound);
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428
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275 }
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276
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277
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278 static
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279 CopyData (target_file, source_file, total_byte_count)
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280 int target_file, source_file;
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281 long total_byte_count;
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282 {
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283 unsigned char buffer[4096];
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284 long byte_count;
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285 while (total_byte_count > 0)
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286 {
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287 if (total_byte_count > sizeof (buffer))
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288 byte_count = sizeof (buffer);
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289 else byte_count = total_byte_count;
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290 if (read (source_file, buffer, byte_count) != byte_count)
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563
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291 signal_error (Qfile_error, "cannot read data", Qunbound);
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428
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292 if (write (target_file, buffer, byte_count) != byte_count)
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563
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293 signal_error (Qfile_error, "cannot write data", Qunbound);
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428
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294 total_byte_count -= byte_count;
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295 }
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296 }
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