1 files changed, 137 insertions, 0 deletions

diff --git a/arch/sparc/boot/piggyback.c b/arch/sparc/boot/piggyback.c
new file mode 100644
index 000000000000..6962cc68ed5b
--- /dev/null
+++ b/arch/sparc/boot/piggyback.c
@@ -0,0 +1,137 @@
+/* $Id: piggyback.c,v 1.4 2000/12/05 00:48:57 anton Exp $
+   Simple utility to make a single-image install kernel with initial ramdisk
+   for Sparc tftpbooting without need to set up nfs.
+
+   Copyright (C) 1996 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
+   Pete Zaitcev <zaitcev@yahoo.com> endian fixes for cross-compiles, 2000.
+
+   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.
+   
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
+   
+#include <stdio.h>
+#include <string.h>
+#include <ctype.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <dirent.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+
+/*
+ * Note: run this on an a.out kernel (use elftoaout for it),
+ * as PROM looks for a.out image only.
+ */
+
+unsigned short ld2(char *p)
+{
+        return (p[0] << 8) | p[1];
+}
+
+unsigned int ld4(char *p)
+{
+        return (p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3];
+}
+
+void st4(char *p, unsigned int x)
+{
+        p[0] = x >> 24;
+        p[1] = x >> 16;
+        p[2] = x >> 8;
+        p[3] = x;
+}
+
+void usage(void)
+{
+        /* fs_img.gz is an image of initial ramdisk. */
+        fprintf(stderr, "Usage: piggyback vmlinux.aout System.map fs_img.gz\n");
+        fprintf(stderr, "\tKernel image will be modified in place.\n");
+        exit(1);
+}
+
+void die(char *str)
+{
+        perror (str);
+        exit(1);
+}
+
+int main(int argc,char **argv)
+{
+        static char aout_magic[] = { 0x01, 0x03, 0x01, 0x07 };
+        unsigned char buffer[1024], *q, *r;
+        unsigned int i, j, k, start, end, offset;
+        FILE *map;
+        struct stat s;
+        int image, tail;
+
+        if (argc != 4) usage();
+        start = end = 0;
+        if (stat (argv[3], &s) < 0) die (argv[3]);
+        map = fopen (argv[2], "r");
+        if (!map) die(argv[2]);
+        while (fgets (buffer, 1024, map)) {
+                if (!strcmp (buffer + 8, " T start\n") || !strcmp (buffer + 16, " T start\n"))
+                        start = strtoul (buffer, NULL, 16);
+                else if (!strcmp (buffer + 8, " A end\n") || !strcmp (buffer + 16, " A end\n"))
+                        end = strtoul (buffer, NULL, 16);
+        }
+        fclose (map);
+        if (!start || !end) {
+                fprintf (stderr, "Could not determine start and end from System.map\n");
+                exit(1);
+        }
+        if ((image = open(argv[1],O_RDWR)) < 0) die(argv[1]);
+        if (read(image,buffer,512) != 512) die(argv[1]);
+        if (memcmp (buffer, "\177ELF", 4) == 0) {
+                q = buffer + ld4(buffer + 28);
+                i = ld4(q + 4) + ld4(buffer + 24) - ld4(q + 8);
+                if (lseek(image,i,0) < 0) die("lseek");
+                if (read(image,buffer,512) != 512) die(argv[1]);
+                j = 0;
+        } else if (memcmp(buffer, aout_magic, 4) == 0) {
+                i = j = 32;
+        } else {
+                fprintf (stderr, "Not ELF nor a.out. Don't blame me.\n");
+                exit(1);
+        }
+        k = i;
+        i += (ld2(buffer + j + 2)<<2) - 512;
+        if (lseek(image,i,0) < 0) die("lseek");
+        if (read(image,buffer,1024) != 1024) die(argv[1]);
+        for (q = buffer, r = q + 512; q < r; q += 4) {
+                if (*q == 'H' && q[1] == 'd' && q[2] == 'r' && q[3] == 'S')
+                        break;
+        }
+        if (q == r) {
+                fprintf (stderr, "Couldn't find headers signature in the kernel.\n");
+                exit(1);
+        }
+        offset = i + (q - buffer) + 10;
+        if (lseek(image, offset, 0) < 0) die ("lseek");
+
+        st4(buffer, 0);
+        st4(buffer + 4, 0x01000000);
+        st4(buffer + 8, (end + 32 + 4095) & ~4095);
+        st4(buffer + 12, s.st_size);
+
+        if (write(image,buffer+2,14) != 14) die (argv[1]);
+        if (lseek(image, k - start + ((end + 32 + 4095) & ~4095), 0) < 0) die ("lseek");
+        if ((tail = open(argv[3],O_RDONLY)) < 0) die(argv[3]);
+        while ((i = read (tail,buffer,1024)) > 0)
+                if (write(image,buffer,i) != i) die (argv[1]);
+        if (close(image) < 0) die("close");
+        if (close(tail) < 0) die("close");
+        return 0;
+}