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