Initial revision

1 files changed, 116 insertions, 0 deletions

diff --git a/src/unexencap.c b/src/unexencap.c
new file mode 100644
index 00000000000..4ffc41145a9
--- /dev/null
+++ b/src/unexencap.c
@@ -0,0 +1,116 @@
+/* Waiting for papers!  */
+
+/*
+ * Do an unexec() for coff encapsulation. Uses the approach I took
+ * for AKCL, so don't be surprised if it doesn't look too much like
+ * the other unexec() routines. Assumes NO_REMAP. Should be easy to
+ * adapt to the emacs style unexec() if that is desired, but this works
+ * just fine for me with GCC/GAS/GLD under System V.  - Jordan
+ */
+
+#include <sys/types.h>
+#include <sys/fcntl.h>
+#include <sys/file.h>
+#include <stdio.h>
+#include "/usr/gnu/lib/gcc/gcc-include/a.out.h"
+
+filecpy(to, from, n)
+FILE *to, *from;
+register int n;
+{
+	char buffer[BUFSIZ];
+
+	for (;;)
+		if (n > BUFSIZ) {
+			fread(buffer, BUFSIZ, 1, from);
+			fwrite(buffer, BUFSIZ, 1, to);
+			n -= BUFSIZ;
+		} else if (n > 0) {
+			fread(buffer, 1, n, from);
+			fwrite(buffer, 1, n, to);
+			break;
+		} else
+			break;
+}
+/* ****************************************************************
+ * unexec
+ *
+ * driving logic.
+ * ****************************************************************/
+unexec (new_name, a_name, data_start, bss_start, entry_address)
+char *new_name, *a_name;
+unsigned data_start, bss_start, entry_address;
+{	
+	struct coffheader header1;
+	struct coffscn *tp, *dp, *bp;
+	struct exec header;
+	int stsize;
+	char *original_file = a_name;
+	char *save_file = new_name;
+
+	char *data_begin, *data_end;
+	int original_data;
+	FILE *original, *save;
+	register int n;
+	register char *p;
+	extern char *sbrk();
+	char stdin_buf[BUFSIZ], stdout_buf[BUFSIZ];
+
+
+	fclose(stdin);
+	original = fopen(original_file, "r");
+	if (stdin != original || original->_file != 0) {
+		fprintf(stderr, "unexec: Can't open the original file.\n");
+		exit(1);
+	}
+	setbuf(original, stdin_buf);
+	fclose(stdout);
+	unlink(save_file);
+	n = open(save_file, O_CREAT|O_WRONLY, 0777);
+	if (n != 1 || (save = fdopen(n, "w")) != stdout) {
+		fprintf(stderr, "unexec: Can't open the save file.\n");
+		exit(1);
+	}
+	setbuf(save, stdout_buf);
+
+	fread(&header1, sizeof(header1), 1, original);
+        tp = &header1.scns[0];
+        dp = &header1.scns[1];
+        bp = &header1.scns[2];
+        fread(&header, sizeof(header), 1, original);
+        data_begin=(char *)N_DATADDR(header);
+        data_end = sbrk(0);
+        original_data = header.a_data;
+        header.a_data = data_end - data_begin;
+        header.a_bss = 0;
+        dp->s_size = header.a_data;
+        bp->s_paddr = dp->s_vaddr + dp->s_size;
+        bp->s_vaddr = bp->s_paddr; 
+        bp->s_size = 0; 
+        header1.tsize = tp->s_size;
+        header1.dsize = dp->s_size;
+        header1.bsize = bp->s_size;
+        fwrite(&header1, sizeof(header1), 1, save);
+        fwrite(&header, sizeof(header), 1, save);
+
+        filecpy(save, original, header.a_text);
+
+	for (n = header.a_data, p = data_begin;  ;  n -= BUFSIZ, p += BUFSIZ)
+		if (n > BUFSIZ)
+			fwrite(p, BUFSIZ, 1, save);
+		else if (n > 0) {
+			fwrite(p, 1, n, save);
+			break;
+		} else
+			break;
+
+	fseek(original, original_data, 1);
+
+        filecpy(save, original, header.a_syms+header.a_trsize+header.a_drsize);
+        fread(&stsize, sizeof(stsize), 1, original);
+        fwrite(&stsize, sizeof(stsize), 1, save);
+        filecpy(save, original, stsize - sizeof(stsize));
+
+	fclose(original);
+	fclose(save);
+}