1 /* $NetBSD: setnetimage.c,v 1.8 2009/03/14 15:36:12 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
main(int argc,char ** argv)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 }
215