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1 /* Waiting for papers! */
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2
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3 /* Synched up with: FSF 19.31. */
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4
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5 /*
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6 * Do an unexec() for coff encapsulation. Uses the approach I took
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7 * for AKCL, so don't be surprised if it doesn't look too much like
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8 * the other unexec() routines. Assumes NO_REMAP. Should be easy to
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9 * adapt to the emacs style unexec() if that is desired, but this works
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10 * just fine for me with GCC/GAS/GLD under System V. - Jordan
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11 */
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12
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13 #include <sys/types.h>
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14 #include <sys/fcntl.h>
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15 #include <sys/file.h>
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16 #include <stdio.h>
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17 #include "/usr/gnu/lib/gcc/gcc-include/a.out.h"
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18
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19 filecpy(to, from, n)
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20 FILE *to, *from;
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21 int n;
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22 {
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23 char buffer[BUFSIZ];
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24
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25 for (;;)
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26 if (n > BUFSIZ) {
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27 fread(buffer, BUFSIZ, 1, from);
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28 fwrite(buffer, BUFSIZ, 1, to);
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29 n -= BUFSIZ;
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30 } else if (n > 0) {
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31 fread(buffer, 1, n, from);
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32 fwrite(buffer, 1, n, to);
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33 break;
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34 } else
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35 break;
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36 }
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37 /* ****************************************************************
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38 * unexec
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39 *
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40 * driving logic.
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41 * ****************************************************************/
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42 unexec (new_name, a_name, data_start, bss_start, entry_address)
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43 char *new_name, *a_name;
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44 unsigned data_start, bss_start, entry_address;
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45 {
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46 struct coffheader header1;
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47 struct coffscn *tp, *dp, *bp;
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48 struct exec header;
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49 int stsize;
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50 char *original_file = a_name;
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51 char *save_file = new_name;
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52
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53 char *data_begin, *data_end;
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54 int original_data;
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55 FILE *original, *save;
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56 int n;
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57 char *p;
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58 extern char *sbrk();
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59 char stdin_buf[BUFSIZ], stdout_buf[BUFSIZ];
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60
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61
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62 fclose(stdin);
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63 original = fopen(original_file, "r");
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64 if (stdin != original || original->_file != 0) {
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65 fprintf(stderr, "unexec: Can't open the original file.\n");
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66 exit(1);
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67 }
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68 setbuf(original, stdin_buf);
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69 fclose(stdout);
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70 unlink(save_file);
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71 n = open (save_file, O_CREAT|O_WRONLY, 0777);
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72 if (n != 1 || (save = fdopen(n, "w")) != stdout) {
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73 fprintf(stderr, "unexec: Can't open the save file.\n");
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74 exit(1);
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75 }
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76 setbuf(save, stdout_buf);
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77
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78 fread(&header1, sizeof(header1), 1, original);
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79 tp = &header1.scns[0];
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80 dp = &header1.scns[1];
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81 bp = &header1.scns[2];
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82 fread(&header, sizeof(header), 1, original);
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83 data_begin=(char *)N_DATADDR(header);
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84 data_end = sbrk(0);
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85 original_data = header.a_data;
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86 header.a_data = data_end - data_begin;
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87 header.a_bss = 0;
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88 dp->s_size = header.a_data;
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89 bp->s_paddr = dp->s_vaddr + dp->s_size;
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90 bp->s_vaddr = bp->s_paddr;
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91 bp->s_size = 0;
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92 header1.tsize = tp->s_size;
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93 header1.dsize = dp->s_size;
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94 header1.bsize = bp->s_size;
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95 fwrite(&header1, sizeof(header1), 1, save);
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96 fwrite(&header, sizeof(header), 1, save);
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97
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98 filecpy(save, original, header.a_text);
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99
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100 for (n = header.a_data, p = data_begin; ; n -= BUFSIZ, p += BUFSIZ)
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101 if (n > BUFSIZ)
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102 fwrite(p, BUFSIZ, 1, save);
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103 else if (n > 0) {
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104 fwrite(p, 1, n, save);
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105 break;
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106 } else
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107 break;
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108
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109 fseek(original, original_data, 1);
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110
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111 filecpy(save, original, header.a_syms+header.a_trsize+header.a_drsize);
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112 fread(&stsize, sizeof(stsize), 1, original);
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113 fwrite(&stsize, sizeof(stsize), 1, save);
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114 filecpy(save, original, stsize - sizeof(stsize));
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115
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116 fclose(original);
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117 fclose(save);
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118 }
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