sys/arch/pmax/stand/smallnet/setnetimage/setnetimage.c

   1 /*      $NetBSD: setnetimage.c,v 1.7 2009/03/14 14:46:05 dsl Exp $      */
   2
   3 /*-
   4  * Copyright (c) 1999 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software contributed to The NetBSD Foundation
   8  * by Simon Burge.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  29  * POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32 #include <sys/types.h>
  33 #include <sys/mman.h>
  34 #include <sys/stat.h>
  35 #include <sys/exec_elf.h>
  36
  37 #include <err.h>
  38 #include <fcntl.h>
  39 #include <nlist.h>
  40 #include <limits.h>
  41 #include <stdio.h>
  42 #include <stdlib.h>
  43 #include <unistd.h>
  44 #include <zlib.h>
  45
  46 #include "extern.h"
  47
  48 #define MAX_SEGMENTS            10      /* We can load up to 10 segments */
  49
  50 struct nlist nl[] = {
  51 #define X_KERNEL_ENTRY          0
  52         { "_kernel_entry" },
  53 #define X_KERNEL_IMAGE          1
  54         { "_kernel_image" },
  55 #define X_KERNEL_LOADADDR       2
  56         { "_kernel_loadaddr" },
  57 #define X_KERNEL_SIZE           3
  58         { "_kernel_size" },
  59 #define X_MAXKERNEL_SIZE        4
  60         { "_maxkernel_size" },
  61         { NULL }
  62 };
  63 #define X_NSYMS                 ((sizeof(nl) / sizeof(struct nlist)) - 1)
  64
  65 struct seglist {
  66         Elf32_Addr addr;
  67         Elf32_Off f_offset;
  68         Elf32_Word f_size;
  69 };
  70
  71 #define NLADDR(x)       (mappedbfile + offsets[(x)])
  72 #define NLVAR(x)        (*(u_long *)(NLADDR(x)))
  73
  74 int main(int, char **);
  75
  76 int
  77 main(int argc, char **argv)
  78 {
  79         int ifd, ofd, i, nsegs;
  80         size_t offsets[X_NSYMS];
  81         const char *kernel, *bootfile;
  82         char *mappedbfile;
  83         char *uncomp_kernel, *comp_kernel;
  84         Elf32_Addr lowaddr, highaddr;
  85         Elf32_Ehdr ehdr;
  86         Elf32_Phdr phdr;
  87         uLongf destlen;
  88         struct stat osb;
  89         struct seglist seglist[MAX_SEGMENTS];
  90
  91         if (argc != 3) {
  92                 fprintf(stderr, "usage: %s kernel bootfile\n", getprogname());
  93                 exit(1);
  94         }
  95
  96         kernel = argv[1];
  97         bootfile = argv[2];
  98
  99         if ((ifd = open(kernel, O_RDONLY)) < 0)
 100                 err(1, "%s", kernel);
 101
 102         if ((ofd = open(bootfile, O_RDWR)) < 0)
 103                 err(1, "%s", bootfile);
 104
 105         if (nlist(bootfile, nl) != 0)
 106                 errx(1, "Could not find symbols in %s", bootfile);
 107
 108         if (fstat(ofd, &osb) == -1)
 109                 err(1, "fstat %s", bootfile);
 110         if (osb.st_size > SIZE_T_MAX)
 111                 errx(1, "%s too big to map", bootfile);
 112
 113         if ((mappedbfile = mmap(NULL, osb.st_size, PROT_READ | PROT_WRITE,
 114             MAP_FILE | MAP_SHARED, ofd, 0)) == (void *)-1)
 115                 err(1, "mmap %s", bootfile);
 116         printf("mapped %s\n", bootfile);
 117
 118         if (check_elf32(mappedbfile, osb.st_size) != 0)
 119                 errx(1, "No ELF header in %s", bootfile);
 120
 121         for (i = 0; i < X_NSYMS; i++) {
 122                 if (findoff_elf32(mappedbfile, osb.st_size, nl[i].n_value, &offsets[i]) != 0)
 123                         errx(1, "Couldn't find offset for %s in %s", nl[i].n_name, bootfile);
 124 #ifdef DEBUG
 125                 printf("%s is at offset %#x in %s\n", nl[i].n_name, offsets[i], bootfile);
 126 #endif
 127         }
 128
 129         /* read the exec header */
 130         i = read(ifd, (char *)&ehdr, sizeof(ehdr));
 131         if ((i != sizeof(ehdr)) ||
 132             (memcmp(ehdr.e_ident, ELFMAG, SELFMAG) != 0) ||
 133             (ehdr.e_ident[EI_CLASS] != ELFCLASS32)) {
 134                 errx(1, "No ELF header in %s", kernel);
 135         }
 136
 137         nsegs = highaddr = 0;
 138         lowaddr = UINT_MAX;
 139         for (i = 0; i < ehdr.e_phnum; i++) {
 140                 if (lseek(ifd, (off_t) ehdr.e_phoff + i * sizeof(phdr), 0) < 0)
 141                         err(1, "%s", kernel);
 142                 if (read(ifd, &phdr, sizeof(phdr)) != sizeof(phdr))
 143                         err(1, "%s", kernel);
 144                 if (phdr.p_type != PT_LOAD)
 145                         continue;
 146
 147                 printf("load section %d at addr 0x%08x, file offset %8d, length %8d\n",
 148                     i, phdr.p_paddr, phdr.p_offset, phdr.p_filesz);
 149
 150                 seglist[nsegs].addr = phdr.p_paddr;
 151                 seglist[nsegs].f_offset = phdr.p_offset;
 152                 seglist[nsegs].f_size = phdr.p_filesz;
 153                 nsegs++;
 154
 155                 if (phdr.p_paddr < lowaddr)
 156                         lowaddr = phdr.p_paddr;
 157                 if (phdr.p_paddr + phdr.p_filesz > highaddr)
 158                         highaddr = phdr.p_paddr + phdr.p_filesz;
 159
 160         }
 161
 162 #ifdef DEBUG
 163         printf("lowaddr =  0x%08x, highaddr = 0x%08x\n", lowaddr, highaddr);
 164 #endif
 165         printf("load address: 0x%08x\n", lowaddr);
 166         printf("entry point:  0x%08x\n", ehdr.e_entry);
 167
 168         destlen = highaddr - lowaddr;
 169
 170         uncomp_kernel = (char *)malloc(destlen);
 171         comp_kernel = (char *)malloc(destlen);          /* Worst case... */
 172         for (i = 0; i < nsegs; i++) {
 173 #ifdef DEBUG
 174                 printf("lseek(ifd, %d, 0)\n", seglist[i].f_offset);
 175 #endif
 176                 if (lseek(ifd, (off_t)seglist[i].f_offset, 0) < 0)
 177                         err(1, "%s", kernel);
 178 #ifdef DEBUG
 179                 printf("read(ifd, %p, %d)\n", \
 180                     uncomp_kernel + seglist[i].addr - lowaddr,
 181                     seglist[i].f_size);
 182 #endif
 183                 if (read(ifd, uncomp_kernel + seglist[i].addr - lowaddr,
 184                     seglist[i].f_size) != seglist[i].f_size)
 185                         err(1, "%s", kernel);
 186         }
 187         close(ifd);
 188
 189         printf("Compressing %d bytes...", highaddr - lowaddr); fflush(stdout);
 190         i = compress2(comp_kernel, &destlen, uncomp_kernel, \
 191             highaddr - lowaddr, Z_BEST_COMPRESSION);
 192         if (i != Z_OK) {
 193                 printf("\n");
 194                 errx(1, "%s compression error %d", kernel, i);
 195         }
 196         printf("done.\n"); fflush(stdout);
 197
 198         printf("max kernelsize = %ld\n", NLVAR(X_MAXKERNEL_SIZE));
 199         printf("compressed size = %ld\n", destlen);
 200         if (destlen > NLVAR(X_MAXKERNEL_SIZE))
 201                 errx(1, "kernel %s is too big, "
 202                     "increase KERNELSIZE to at least %ld",
 203                     kernel, destlen);
 204
 205         NLVAR(X_KERNEL_SIZE) = destlen;
 206         NLVAR(X_KERNEL_LOADADDR) = lowaddr;
 207         NLVAR(X_KERNEL_ENTRY) = ehdr.e_entry;
 208         memcpy(NLADDR(X_KERNEL_IMAGE), comp_kernel, destlen);
 209         munmap(mappedbfile, osb.st_size);
 210         printf("unmapped %s\n", bootfile);
 211         close(ofd);
 212
 213         exit(0);
 214 }