*Very* rough cut at a ramdisk-kernel that fits onto a floppy.

The ecoffrdsetroot support is from millert@openbsd.org.  Mostly copied from
the powerpc ports, thus a lot of powerpc specific stuff remains.
Needs a lot of work, hopefully done in the next few days.

1 files changed, 212 insertions, 0 deletions

diff --git a/distrib/alpha/ecoffrdsetroot.c b/distrib/alpha/ecoffrdsetroot.c
new file mode 100644
index 00000000000..5997ee9a726
--- /dev/null
+++ b/distrib/alpha/ecoffrdsetroot.c
@@ -0,0 +1,212 @@
+/*	$OpenBSD: ecoffrdsetroot.c,v 1.1 1997/05/07 12:46:49 niklas Exp $	*/
+
+/*
+ * Copyright (c) 1997 Todd C. Milller
+ * Copyright (c) 1994 Gordon W. Ross
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/*
+ * Copy a ramdisk image into the space reserved for it.
+ * Kernel variables: rd_root_size, rd_root_image
+ */
+
+#include <err.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include <sys/types.h>
+#include <sys/file.h>
+#include <sys/mman.h>
+#include <sys/exec_ecoff.h>
+#include <nlist.h>
+
+void find_rd_root_image __P((char *));
+
+struct ecoff_exechdr head;
+char *file;
+
+/* Virtual addresses of the symbols we frob. */
+long rd_root_image_va, rd_root_size_va;
+
+/* Offsets relative to start of data segment. */
+long rd_root_image_off, rd_root_size_off;
+
+/* value in the location at rd_root_size_off */
+int rd_root_size_val;
+
+/* pointers to pieces of mapped file */
+char *dataseg;
+
+/* and lengths */
+int data_len;
+int data_off;
+int data_pgoff;
+
+/*
+ * To find locations of the symbols to patch.
+ */
+struct nlist wantsyms[] = {
+	{ "_rd_root_size", 0 },
+	{ "_rd_root_image", 0 },
+	{ NULL, 0 },
+};
+
+int
+main(argc,argv)
+	int argc;
+	char **argv;
+{
+	int fd, n;
+	int *ip;
+	char *cp;
+
+	if (argc < 2)
+		errx(1, "missing file name");
+	file = argv[1];
+
+	fd = open(file, O_RDWR);
+	if (fd < 0)
+		err(1, "open %s", file);
+
+	n = read(fd, &head, sizeof(head));
+	if (n < sizeof(head))
+		errx(1, "%s: short read reading header", file);
+
+	if (head.a.magic != ECOFF_OMAGIC)
+		errx(1, "%s: bad magic number (0%o)", file, head.a.magic);
+
+#ifdef	DEBUG
+	(void)printf("ecoff header\n");
+	(void)printf(" nscns:  %9ld\n", head.f.f_nscns); */
+	(void)printf("timdat:  %9ld\n", head.f.f_timdat); */
+	(void)printf("symptr:  %9ld\n", head.f.f_symptr); */
+	(void)printf(" nsyms:  %9ld\n", head.f.f_nsyms); */
+	(void)printf("opthdr:  %9ld\n", head.f.f_opthdr); */
+	(void)printf(" flags:  %9ld\n", head.f.f_flags); */
+	(void)printf("a.out header\n");
+	(void)printf("vstamp:  %9ld\n", head.a.vstamp);
+	(void)printf(" tsize:  %9ld\n", head.a.tsize);
+	(void)printf(" dsize:  %9ld\n", head.a.dsize);
+	(void)printf(" bsize:  %9ld\n", head.a.bsize);
+	(void)printf(" entry:  0x%08X\n", head.a.entry);
+	(void)printf("  text:  %9ld\n", head.a.text_start);
+	(void)printf("  data:  %9ld\n", head.a.data_start);
+	(void)printf("   bss:  %9ld\n", head.a.bss_start);
+#endif
+
+	if (head.f.f_nsyms <= 0)
+		errx(1, "%s: no symbols", file);
+
+	find_rd_root_image(file);
+
+	/*
+	 * Map in the whole data segment.
+	 * The file offset needs to be page aligned.
+	 */
+	data_off = ECOFF_DATOFF(&head);
+	data_len = head.a.dsize;
+#if 0
+	/* align... */
+	data_pgoff = N_PAGSIZ(head) - 1;
+	data_pgoff &= data_off;
+	data_off -= data_pgoff;
+	data_len += data_pgoff;
+#endif
+	/* map in in... */
+	dataseg = mmap(NULL,	/* any address is ok */
+				   data_len, /* length */
+				   PROT_READ | PROT_WRITE,
+				   MAP_SHARED,
+				   fd, data_off);
+
+	if ((long)dataseg == -1)
+		err(1, "%s: can not map data seg", file);
+#if 0
+	dataseg += data_pgoff;
+#endif
+
+	/*
+	 * Find value in the location: rd_root_size
+	 */
+	ip = (int *) (dataseg + rd_root_size_off);
+	rd_root_size_val = *ip;
+#ifdef	DEBUG
+	(void)printf("rd_root_size  val: 0x%08X (%d blocks)\n",
+		rd_root_size_val, (rd_root_size_val >> 9));
+#endif
+
+	/*
+	 * Copy the symbol table and string table.
+	 */
+#ifdef	DEBUG
+	(void)printf("copying root image...\n");
+#endif
+	n = read(0, dataseg + rd_root_image_off, rd_root_size_val);
+	if (n < 0)
+		err(1, "read root image");
+
+	msync(dataseg - data_pgoff, data_len
+#ifdef	sun
+		  ,0
+#endif
+		  );
+
+#ifdef	DEBUG
+	(void)printf("...copied %d bytes\n", n);
+#endif
+	(void)close(fd);
+	exit(0);
+}
+
+
+void
+find_rd_root_image(file)
+	char *file;
+{
+	u_long data_va = head.a.data_start;
+
+	if (nlist(file, wantsyms))
+		errx(1, "%s: no rd_root_image symbols?", file);
+
+	rd_root_size_off = wantsyms[0].n_value - data_va;
+	rd_root_image_off     = wantsyms[1].n_value - data_va;
+#ifdef	DEBUG
+	(void)printf(".data segment  va: 0x%08X\n", data_va);
+	(void)printf("rd_root_size   va: 0x%08X\n", wantsyms[0].n_value);
+	(void)printf("rd_root_image  va: 0x%08X\n", wantsyms[1].n_value);
+	(void)printf("rd_root_size  off: 0x%08X\n", rd_root_size_off);
+	(void)printf("rd_root_image off: 0x%08X\n", rd_root_image_off);
+#endif
+
+	/*
+	 * Sanity check locations of db_* symbols
+	 */
+	if (rd_root_image_off < 0 || rd_root_image_off >= head.a.data_start)
+		errx(1, "%s: rd_root_image not in data segment?", file);
+	if (rd_root_size_off < 0 || rd_root_size_off >= head.a.data_start)
+		errx(1, "%s: rd_root_size not in data segment?", file);
+}