patch-2.1.51 linux/arch/ppc/coffboot/elfextract.c

• Lines: 99
• Date: Sat Aug 16 09:51:08 1997
• Orig file: v2.1.50/linux/arch/ppc/coffboot/elfextract.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.50/linux/arch/ppc/coffboot/elfextract.c linux/arch/ppc/coffboot/elfextract.c
@@ -0,0 +1,98 @@
+/*
+ * Extract the loadable program segment from an elf file.
+ *
+ * Copyright 1996 Paul Mackerras.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+#include <stdio.h>
+#include <linux/elf.h>
+
+FILE *fi, *fo;
+char *ni, *no;
+char buf[65536];
+
+void
+rd(void *buf, int len)
+{
+    int nr;
+
+    nr = fread(buf, 1, len, fi);
+    if (nr == len)
+	return;
+    if (ferror(fi))
+	fprintf(stderr, "%s: read error\n", ni);
+    else
+	fprintf(stderr, "%s: short file\n", ni);
+    exit(1);
+}
+
+main(int ac, char **av)
+{
+    unsigned nb, len;
+    Elf32_Ehdr eh;
+    Elf32_Phdr ph;
+
+    if (ac > 3 || ac > 1 && av[1][0] == '-') {
+	fprintf(stderr, "Usage: %s [elf-file [image-file]]\n", av[0]);
+	exit(0);
+    }
+
+    fi = stdin;
+    ni = "(stdin)";
+    fo = stdout;
+    no = "(stdout)";
+
+    if (ac > 1) {
+	ni = av[1];
+	fi = fopen(ni, "rb");
+	if (fi == NULL) {
+	    perror(ni);
+	    exit(1);
+	}
+    }
+
+    rd(&eh, sizeof(eh));
+    if (eh.e_ident[EI_MAG0] != ELFMAG0
+	|| eh.e_ident[EI_MAG1] != ELFMAG1
+	|| eh.e_ident[EI_MAG2] != ELFMAG2
+	|| eh.e_ident[EI_MAG3] != ELFMAG3) {
+	fprintf(stderr, "%s: not an ELF file\n", ni);
+	exit(1);
+    }
+
+    fseek(fi, eh.e_phoff + (eh.e_phnum - 1) * sizeof(ph), 0);
+    rd(&ph, sizeof(ph));
+    if (ph.p_type != PT_LOAD) {
+	fprintf(stderr, "%s: doesn't have a loadable segment\n", ni);
+	exit(1);
+    }
+
+    if (ac > 2) {
+	no = av[2];
+	fo = fopen(no, "wb");
+	if (fo == NULL) {
+	    perror(no);
+	    exit(1);
+	}
+    }
+
+    fseek(fi, ph.p_offset, 0);
+    for (len = ph.p_filesz; len != 0; len -= nb) {
+	nb = len;
+	if (nb > sizeof(buf))
+	    nb = sizeof(buf);
+	rd(buf, nb);
+	if (fwrite(buf, 1, nb, fo) != nb) {
+	    fprintf(stderr, "%s: write error\n", no);
+	    exit(1);
+	}
+    }
+
+    fclose(fo);
+    fclose(fi);
+    exit(0);
+}