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117 lines
3.1 KiB
C
117 lines
3.1 KiB
C
/* Waiting for papers! */
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/*
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* Do an unexec() for coff encapsulation. Uses the approach I took
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* for AKCL, so don't be surprised if it doesn't look too much like
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* the other unexec() routines. Assumes NO_REMAP. Should be easy to
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* adapt to the emacs style unexec() if that is desired, but this works
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* just fine for me with GCC/GAS/GLD under System V. - Jordan
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*/
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#include <sys/types.h>
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#include <sys/fcntl.h>
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#include <sys/file.h>
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#include <stdio.h>
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#include "/usr/gnu/lib/gcc/gcc-include/a.out.h"
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filecpy(to, from, n)
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FILE *to, *from;
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register int n;
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{
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char buffer[BUFSIZ];
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for (;;)
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if (n > BUFSIZ) {
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fread(buffer, BUFSIZ, 1, from);
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fwrite(buffer, BUFSIZ, 1, to);
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n -= BUFSIZ;
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} else if (n > 0) {
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fread(buffer, 1, n, from);
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fwrite(buffer, 1, n, to);
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break;
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} else
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break;
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}
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/* ****************************************************************
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* unexec
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*
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* driving logic.
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* ****************************************************************/
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unexec (new_name, a_name, data_start, bss_start, entry_address)
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char *new_name, *a_name;
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unsigned data_start, bss_start, entry_address;
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{
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struct coffheader header1;
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struct coffscn *tp, *dp, *bp;
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struct exec header;
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int stsize;
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char *original_file = a_name;
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char *save_file = new_name;
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char *data_begin, *data_end;
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int original_data;
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FILE *original, *save;
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register int n;
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register char *p;
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extern char *sbrk();
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char stdin_buf[BUFSIZ], stdout_buf[BUFSIZ];
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fclose(stdin);
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original = fopen(original_file, "r");
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if (stdin != original || original->_file != 0) {
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fprintf(stderr, "unexec: Can't open the original file.\n");
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exit(1);
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}
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setbuf(original, stdin_buf);
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fclose(stdout);
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unlink(save_file);
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n = open(save_file, O_CREAT|O_WRONLY, 0777);
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if (n != 1 || (save = fdopen(n, "w")) != stdout) {
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fprintf(stderr, "unexec: Can't open the save file.\n");
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exit(1);
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}
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setbuf(save, stdout_buf);
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fread(&header1, sizeof(header1), 1, original);
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tp = &header1.scns[0];
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dp = &header1.scns[1];
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bp = &header1.scns[2];
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fread(&header, sizeof(header), 1, original);
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data_begin=(char *)N_DATADDR(header);
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data_end = sbrk(0);
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original_data = header.a_data;
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header.a_data = data_end - data_begin;
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header.a_bss = 0;
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dp->s_size = header.a_data;
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bp->s_paddr = dp->s_vaddr + dp->s_size;
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bp->s_vaddr = bp->s_paddr;
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bp->s_size = 0;
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header1.tsize = tp->s_size;
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header1.dsize = dp->s_size;
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header1.bsize = bp->s_size;
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fwrite(&header1, sizeof(header1), 1, save);
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fwrite(&header, sizeof(header), 1, save);
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filecpy(save, original, header.a_text);
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for (n = header.a_data, p = data_begin; ; n -= BUFSIZ, p += BUFSIZ)
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if (n > BUFSIZ)
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fwrite(p, BUFSIZ, 1, save);
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else if (n > 0) {
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fwrite(p, 1, n, save);
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break;
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} else
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break;
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fseek(original, original_data, 1);
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filecpy(save, original, header.a_syms+header.a_trsize+header.a_drsize);
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fread(&stsize, sizeof(stsize), 1, original);
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fwrite(&stsize, sizeof(stsize), 1, save);
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filecpy(save, original, stsize - sizeof(stsize));
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fclose(original);
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fclose(save);
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}
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