--- /dev/null
+/* $NetBSD: rdsetroot.c,v 1.2 1995/10/13 16:38:39 gwr Exp $ */
+
+/*
+ * Copyright (c) 1997 Dale Rahn
+ * 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.
+ *
+ * $Id: elfrdsetroot.c,v 1.1 1997/01/31 05:04:44 rahnds Exp $
+ */
+
+/*
+ * Copy a ramdisk image into the space reserved for it.
+ * Kernel variables: rd_root_size, rd_root_image
+ */
+
+/*
+ * ELF version by Dale Rahn
+ */
+
+#include <sys/types.h>
+#include <sys/file.h>
+#include <sys/mman.h>
+
+#include <sys/stat.h>
+#include <stdio.h>
+#include <sys/exec_elf.h>
+#include <nlist.h>
+
+extern off_t lseek();
+
+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 *baseptr;
+
+/* and lengths */
+int data_len;
+int data_off;
+int data_pgoff;
+
+
+
+char *pexe;
+
+main(argc,argv)
+ char **argv;
+{
+ int fd, n;
+ int *ip;
+ char *cp;
+ struct stat sb;
+ Elf32_Ehdr *pehdr;
+ Elf32_Shdr *pshdr;
+ Elf32_Phdr *pphdr;
+ int i;
+
+
+ if (argc < 2) {
+ printf("%s: missing file name\n", argv[0]);
+ exit(1);
+ }
+ file = argv[1];
+
+ fd = open(file, O_RDWR);
+ if (fd < 0) {
+ perror(file);
+ exit(1);
+ }
+
+ fstat(fd, &sb);
+ pexe = mmap(0, sb.st_size, PROT_READ|PROT_WRITE,
+ MAP_FILE | MAP_SHARED, fd, 0);
+
+ pehdr = (Elf32_Ehdr *)pexe;
+
+#ifdef DEBUG
+ printf("elf header\n");
+ printf("e_type %x\n", pehdr->e_type);
+ printf("e_machine %x\n", pehdr->e_machine);
+ printf("e_version %x\n", pehdr->e_version);
+ printf("e_entry %x\n", pehdr->e_entry);
+ printf("e_phoff %x\n", pehdr->e_phoff);
+ printf("e_shoff %x\n", pehdr->e_shoff);
+ printf("e_flags %x\n", pehdr->e_flags);
+ printf("e_ehsize %x\n", pehdr->e_ehsize);
+ printf("e_phentsize %x\n", pehdr->e_phentsize);
+ printf("e_phnum %x\n", pehdr->e_phnum);
+ printf("e_shentsize %x\n", pehdr->e_shentsize);
+ printf("e_shnum %x\n", pehdr->e_shnum);
+ printf("e_shstrndx %x\n", pehdr->e_shstrndx);
+#endif
+
+
+ find_rd_root_image(file);
+
+
+ baseptr = pexe;
+
+ /*
+ * Find value in the location: rd_root_size
+ */
+ ip = (int*) (baseptr + rd_root_size_off);
+ rd_root_size_val = *ip;
+#ifdef DEBUG
+ 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
+ printf("copying root image...\n");
+#endif
+ n = read(0, baseptr + rd_root_image_off,
+ rd_root_size_val);
+ if (n < 0) {
+ perror("read");
+ exit(1);
+ }
+
+#if 0
+ msync(baseptr, data_len
+#ifdef sun
+ ,0
+#endif
+ );
+#endif
+
+#ifdef DEBUG
+ printf("...copied %d bytes\n", n);
+#endif
+ close(fd);
+ exit(0);
+}
+
+
+/*
+ * Find locations of the symbols to patch.
+ */
+struct nlist wantsyms[] = {
+ { "_rd_root_size", 0 },
+ { "_rd_root_image", 0 },
+ { NULL, 0 },
+};
+
+find_rd_root_image(file)
+ char *file;
+{
+ int data_va;
+ int std_entry;
+
+ if (nlist(file, wantsyms)) {
+ printf("%s: no rd_root_image symbols?\n", file);
+ exit(1);
+ }
+#if 0
+ std_entry = N_TXTADDR(head) +
+ (head.a_entry & (N_PAGSIZ(head)-1));
+ data_va = N_DATADDR(head);
+ if (head.a_entry != std_entry) {
+ printf("%s: warning: non-standard entry point: 0x%08x\n",
+ file, head.a_entry);
+ printf("\texpecting entry=0x%X\n", std_entry);
+ data_va += (head.a_entry - std_entry);
+ }
+#endif
+ {
+
+ Elf32_Ehdr *pehdr;
+ Elf32_Phdr *phdr;
+ int i;
+ pehdr = (Elf32_Ehdr *)pexe;
+ phdr = (Elf32_Phdr *)(pexe + pehdr->e_phoff);
+ printf("sections:\n");
+ for (i = 1; i <= pehdr->e_phnum; i++, phdr++) {
+ fprintf(stderr, "phseg %d addr %x size %x"
+ " offset %x\n",
+ i, phdr->p_vaddr, phdr->p_memsz, phdr->p_offset );
+ if (wantsyms[0].n_value > phdr->p_vaddr &&
+ (wantsyms[0].n_value <
+ phdr->p_vaddr + phdr->p_filesz))
+ {
+ data_va = - (phdr->p_offset - phdr->p_vaddr);
+ }
+ }
+ printf("esections:\n");
+
+ }
+
+ rd_root_size_off = wantsyms[0].n_value - data_va;
+ rd_root_image_off = wantsyms[1].n_value - data_va;
+#ifdef DEBUG
+ printf(".data segment va: 0x%08X\n", data_va);
+ printf("rd_root_size va: 0x%08X\n", wantsyms[0].n_value);
+ printf("rd_root_image va: 0x%08X\n", wantsyms[1].n_value);
+ printf("rd_root_size off: 0x%08X\n", rd_root_size_off);
+ printf("rd_root_image off: 0x%08X\n", rd_root_image_off);
+
+ {
+ char *base;
+ int *iptr;
+ base= (char *)pexe + rd_root_size_off;
+ iptr = (int *) base;
+ base= (char *)pexe + rd_root_image_off;
+ printf("size %x\n", *iptr);
+ printf("string [%s]\n", base);
+
+ }
+
+#endif
+
+#if 0
+ /*
+ * Sanity check locations of db_* symbols
+ */
+ if (rd_root_image_off < 0 || rd_root_image_off >= head.a_data) {
+ printf("%s: rd_root_image not in data segment?\n", file);
+ exit(1);
+ }
+ if (rd_root_size_off < 0 || rd_root_size_off >= head.a_data) {
+ printf("%s: rd_root_size not in data segment?\n", file);
+ exit(1);
+ }
+#endif
+}
+
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