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comparison src/unexencap.c @ 0:376386a54a3c r19-14

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Import from CVS: tag r19-14
author cvs
date Mon, 13 Aug 2007 08:45:50 +0200
parents
children 04bc9d2f42c7
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-1:000000000000 0:376386a54a3c
1 /* Waiting for papers! */
2
3 /* Synched up with: FSF 19.31. */
4
5 /*
6 * Do an unexec() for coff encapsulation. Uses the approach I took
7 * for AKCL, so don't be surprised if it doesn't look too much like
8 * the other unexec() routines. Assumes NO_REMAP. Should be easy to
9 * adapt to the emacs style unexec() if that is desired, but this works
10 * just fine for me with GCC/GAS/GLD under System V. - Jordan
11 */
12
13 #include <sys/types.h>
14 #include <sys/fcntl.h>
15 #include <sys/file.h>
16 #include <stdio.h>
17 #include "/usr/gnu/lib/gcc/gcc-include/a.out.h"
18
19 filecpy(to, from, n)
20 FILE *to, *from;
21 int n;
22 {
23 char buffer[BUFSIZ];
24
25 for (;;)
26 if (n > BUFSIZ) {
27 fread(buffer, BUFSIZ, 1, from);
28 fwrite(buffer, BUFSIZ, 1, to);
29 n -= BUFSIZ;
30 } else if (n > 0) {
31 fread(buffer, 1, n, from);
32 fwrite(buffer, 1, n, to);
33 break;
34 } else
35 break;
36 }
37 /* ****************************************************************
38 * unexec
39 *
40 * driving logic.
41 * ****************************************************************/
42 unexec (new_name, a_name, data_start, bss_start, entry_address)
43 char *new_name, *a_name;
44 unsigned data_start, bss_start, entry_address;
45 {
46 struct coffheader header1;
47 struct coffscn *tp, *dp, *bp;
48 struct exec header;
49 int stsize;
50 char *original_file = a_name;
51 char *save_file = new_name;
52
53 char *data_begin, *data_end;
54 int original_data;
55 FILE *original, *save;
56 int n;
57 char *p;
58 extern char *sbrk();
59 char stdin_buf[BUFSIZ], stdout_buf[BUFSIZ];
60
61
62 fclose(stdin);
63 original = fopen(original_file, "r");
64 if (stdin != original || original->_file != 0) {
65 fprintf(stderr, "unexec: Can't open the original file.\n");
66 exit(1);
67 }
68 setbuf(original, stdin_buf);
69 fclose(stdout);
70 unlink(save_file);
71 n = open (save_file, O_CREAT|O_WRONLY, 0777);
72 if (n != 1 || (save = fdopen(n, "w")) != stdout) {
73 fprintf(stderr, "unexec: Can't open the save file.\n");
74 exit(1);
75 }
76 setbuf(save, stdout_buf);
77
78 fread(&header1, sizeof(header1), 1, original);
79 tp = &header1.scns[0];
80 dp = &header1.scns[1];
81 bp = &header1.scns[2];
82 fread(&header, sizeof(header), 1, original);
83 data_begin=(char *)N_DATADDR(header);
84 data_end = sbrk(0);
85 original_data = header.a_data;
86 header.a_data = data_end - data_begin;
87 header.a_bss = 0;
88 dp->s_size = header.a_data;
89 bp->s_paddr = dp->s_vaddr + dp->s_size;
90 bp->s_vaddr = bp->s_paddr;
91 bp->s_size = 0;
92 header1.tsize = tp->s_size;
93 header1.dsize = dp->s_size;
94 header1.bsize = bp->s_size;
95 fwrite(&header1, sizeof(header1), 1, save);
96 fwrite(&header, sizeof(header), 1, save);
97
98 filecpy(save, original, header.a_text);
99
100 for (n = header.a_data, p = data_begin; ; n -= BUFSIZ, p += BUFSIZ)
101 if (n > BUFSIZ)
102 fwrite(p, BUFSIZ, 1, save);
103 else if (n > 0) {
104 fwrite(p, 1, n, save);
105 break;
106 } else
107 break;
108
109 fseek(original, original_data, 1);
110
111 filecpy(save, original, header.a_syms+header.a_trsize+header.a_drsize);
112 fread(&stsize, sizeof(stsize), 1, original);
113 fwrite(&stsize, sizeof(stsize), 1, save);
114 filecpy(save, original, stsize - sizeof(stsize));
115
116 fclose(original);
117 fclose(save);
118 }