util/cbfstool/cbfs-mkpayload.c

   1 /*
   2  * cbfs-mkpayload
   3  *
   4  * Copyright (C) 2008 Jordan Crouse <jordan@cosmicpenguin.net>
   5  *               2009 coresystems GmbH
   6  *                 written by Patrick Georgi <patrick.georgi@coresystems.de>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; version 2 of the License.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA, 02110-1301 USA
  20  */
  21
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <string.h>
  25 #include <unistd.h>
  26 #include "elf.h"
  27 #include <fcntl.h>
  28 #include <getopt.h>
  29 #include <sys/stat.h>
  30
  31 #include "common.h"
  32 #include "cbfs.h"
  33
  34 int parse_elf_to_payload(unsigned char *input, unsigned char **output,
  35                          comp_algo algo)
  36 {
  37         Elf32_Phdr *phdr;
  38         Elf32_Ehdr *ehdr;
  39         Elf32_Shdr *shdr;
  40         char *header;
  41         char *strtab;
  42         unsigned char *sptr;
  43         int headers;
  44         int segments = 1;
  45         int isize = 0, osize = 0;
  46         int doffset = 0;
  47         struct cbfs_payload_segment *segs;
  48         int i;
  49
  50         if(!iself(input)){
  51                 printf("Fatal error: the payload file is not in ELF format!\n");
  52                 exit(1);
  53         }
  54
  55
  56         comp_func_ptr compress = compression_function(algo);
  57         if (!compress)
  58                 return -1;
  59
  60         ehdr = (Elf32_Ehdr *) input;
  61         headers = ehdr->e_phnum;
  62         header = (char *)ehdr;
  63
  64         phdr = (Elf32_Phdr *) & (header[ehdr->e_phoff]);
  65         shdr = (Elf32_Shdr *) & (header[ehdr->e_shoff]);
  66
  67         strtab = &header[shdr[ehdr->e_shstrndx].sh_offset];
  68
  69         /* Count the number of headers - look for the .notes.pinfo
  70          * section */
  71
  72         for (i = 0; i < ehdr->e_shnum; i++) {
  73                 char *name;
  74
  75                 if (i == ehdr->e_shstrndx)
  76                         continue;
  77
  78                 if (shdr[i].sh_size == 0)
  79                         continue;
  80
  81                 name = (char *)(strtab + shdr[i].sh_name);
  82
  83                 if (!strcmp(name, ".note.pinfo")) {
  84                         segments++;
  85                         isize += (unsigned int)shdr[i].sh_size;
  86                 }
  87         }
  88
  89         /* Now, regular headers - we only care about PT_LOAD headers,
  90          * because thats what we're actually going to load
  91          */
  92
  93         for (i = 0; i < headers; i++) {
  94                 if (phdr[i].p_type != PT_LOAD)
  95                         continue;
  96
  97                 /* Empty segments are never interesting */
  98                 if (phdr[i].p_memsz == 0)
  99                         continue;
 100
 101                 isize += phdr[i].p_filesz;
 102
 103                 segments++;
 104         }
 105
 106         /* Allocate a block of memory to store the data in */
 107
 108         sptr =
 109             calloc((segments * sizeof(struct cbfs_payload_segment)) + isize, 1);
 110         doffset = (segments * sizeof(struct cbfs_payload_segment));
 111
 112         if (sptr == NULL)
 113                 goto err;
 114
 115         segs = (struct cbfs_payload_segment *)sptr;
 116         segments = 0;
 117
 118         for (i = 0; i < ehdr->e_shnum; i++) {
 119                 char *name;
 120
 121                 if (i == ehdr->e_shstrndx)
 122                         continue;
 123
 124                 if (shdr[i].sh_size == 0)
 125                         continue;
 126
 127                 name = (char *)(strtab + shdr[i].sh_name);
 128
 129                 if (!strcmp(name, ".note.pinfo")) {
 130                         segs[segments].type = PAYLOAD_SEGMENT_PARAMS;
 131                         segs[segments].load_addr = 0;
 132                         segs[segments].len = (unsigned int)shdr[i].sh_size;
 133                         segs[segments].offset = doffset;
 134
 135                         memcpy((unsigned long *)(sptr + doffset),
 136                                &header[shdr[i].sh_offset], shdr[i].sh_size);
 137
 138                         doffset += segs[segments].len;
 139                         osize += segs[segments].len;
 140
 141                         segments++;
 142                 }
 143         }
 144
 145         for (i = 0; i < headers; i++) {
 146                 if (phdr[i].p_type != PT_LOAD)
 147                         continue;
 148
 149                 if (phdr[i].p_memsz == 0)
 150                         continue;
 151
 152                 if (phdr[i].p_filesz == 0) {
 153                         segs[segments].type = PAYLOAD_SEGMENT_BSS;
 154                         segs[segments].load_addr =
 155                             (unsigned long long)htonl(phdr[i].p_paddr);
 156                         segs[segments].mem_len =
 157                             (unsigned int)htonl(phdr[i].p_memsz);
 158                         segs[segments].offset = htonl(doffset);
 159
 160                         segments++;
 161                         continue;
 162                 }
 163
 164                 segs[segments].type = PAYLOAD_SEGMENT_DATA;
 165                 segs[segments].load_addr = (unsigned int)htonl(phdr[i].p_paddr);
 166                 segs[segments].mem_len = (unsigned int)htonl(phdr[i].p_memsz);
 167                 segs[segments].compression = htonl(algo);
 168                 segs[segments].offset = htonl(doffset);
 169
 170                 int len;
 171                 compress((char *)&header[phdr[i].p_offset],
 172                          phdr[i].p_filesz, (char *)(sptr + doffset), &len);
 173                 segs[segments].len = htonl(len);
 174
 175                 /* If the compressed section is larger, then use the
 176                    original stuff */
 177
 178                 if ((unsigned int)len > phdr[i].p_filesz) {
 179                         segs[segments].compression = 0;
 180                         segs[segments].len = htonl(phdr[i].p_filesz);
 181
 182                         memcpy((char *)(sptr + doffset),
 183                                &header[phdr[i].p_offset], phdr[i].p_filesz);
 184                 }
 185
 186                 doffset += ntohl(segs[segments].len);
 187                 osize += ntohl(segs[segments].len);
 188
 189                 segments++;
 190         }
 191
 192         segs[segments].type = PAYLOAD_SEGMENT_ENTRY;
 193         segs[segments++].load_addr = (unsigned long long)htonl(ehdr->e_entry);
 194
 195         *output = sptr;
 196
 197         return (segments * sizeof(struct cbfs_payload_segment)) + osize;
 198
 199       err:
 200         return -1;
 201 }