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 #include <arpa/inet.h>
  31
  32 #include "common.h"
  33 #include "cbfs.h"
  34
  35 int parse_elf_to_payload(unsigned char *input, unsigned char **output,
  36                          comp_algo algo)
  37 {
  38         Elf32_Phdr *phdr;
  39         Elf32_Ehdr *ehdr;
  40         Elf32_Shdr *shdr;
  41         char *header;
  42         char *strtab;
  43         unsigned char *sptr;
  44         int headers;
  45         int segments = 1;
  46         int isize = 0, osize = 0;
  47         int doffset = 0;
  48         struct cbfs_payload_segment *segs;
  49         int i;
  50
  51         comp_func_ptr compress = compression_function(algo);
  52         if (!compress)
  53                 return -1;
  54
  55         ehdr = (Elf32_Ehdr *) input;
  56         headers = ehdr->e_phnum;
  57         header = (char *)ehdr;
  58
  59         phdr = (Elf32_Phdr *) & (header[ehdr->e_phoff]);
  60         shdr = (Elf32_Shdr *) & (header[ehdr->e_shoff]);
  61
  62         strtab = &header[shdr[ehdr->e_shstrndx].sh_offset];
  63
  64         /* Count the number of headers - look for the .notes.pinfo
  65          * section */
  66
  67         for (i = 0; i < ehdr->e_shnum; i++) {
  68                 char *name;
  69
  70                 if (i == ehdr->e_shstrndx)
  71                         continue;
  72
  73                 if (shdr[i].sh_size == 0)
  74                         continue;
  75
  76                 name = (char *)(strtab + shdr[i].sh_name);
  77
  78                 if (!strcmp(name, ".note.pinfo"))
  79                         segments++;
  80         }
  81
  82         /* Now, regular headers - we only care about PT_LOAD headers,
  83          * because thats what we're actually going to load
  84          */
  85
  86         for (i = 0; i < headers; i++) {
  87                 if (phdr[i].p_type != PT_LOAD)
  88                         continue;
  89
  90                 /* Empty segments are never interesting */
  91                 if (phdr[i].p_memsz == 0)
  92                         continue;
  93
  94                 isize += phdr[i].p_filesz;
  95
  96                 segments++;
  97         }
  98
  99         /* Allocate a block of memory to store the data in */
 100
 101         sptr =
 102             calloc((segments * sizeof(struct cbfs_payload_segment)) + isize, 1);
 103         doffset = (segments * sizeof(struct cbfs_payload_segment));
 104
 105         if (sptr == NULL)
 106                 goto err;
 107
 108         segs = (struct cbfs_payload_segment *)sptr;
 109         segments = 0;
 110
 111         for (i = 0; i < ehdr->e_shnum; i++) {
 112                 char *name;
 113
 114                 if (i == ehdr->e_shstrndx)
 115                         continue;
 116
 117                 if (shdr[i].sh_size == 0)
 118                         continue;
 119
 120                 name = (char *)(strtab + shdr[i].sh_name);
 121
 122                 if (!strcmp(name, ".note.pinfo")) {
 123                         segs[segments].type = PAYLOAD_SEGMENT_PARAMS;
 124                         segs[segments].load_addr = 0;
 125                         segs[segments].len = (unsigned int)shdr[i].sh_size;
 126                         segs[segments].offset = doffset;
 127
 128                         memcpy((unsigned long *)(sptr + doffset),
 129                                &header[shdr[i].sh_offset], shdr[i].sh_size);
 130
 131                         doffset += segs[segments].len;
 132                         osize += segs[segments].len;
 133
 134                         segments++;
 135                 }
 136         }
 137
 138         for (i = 0; i < headers; i++) {
 139                 if (phdr[i].p_type != PT_LOAD)
 140                         continue;
 141
 142                 if (phdr[i].p_memsz == 0)
 143                         continue;
 144
 145                 if (phdr[i].p_filesz == 0) {
 146                         segs[segments].type = PAYLOAD_SEGMENT_BSS;
 147                         segs[segments].load_addr =
 148                             (unsigned long long)htonl(phdr[i].p_paddr);
 149                         segs[segments].mem_len =
 150                             (unsigned int)htonl(phdr[i].p_memsz);
 151                         segs[segments].offset = htonl(doffset);
 152
 153                         segments++;
 154                         continue;
 155                 }
 156
 157                 segs[segments].type = PAYLOAD_SEGMENT_DATA;
 158                 segs[segments].load_addr = (unsigned int)htonl(phdr[i].p_paddr);
 159                 segs[segments].mem_len = (unsigned int)htonl(phdr[i].p_memsz);
 160                 segs[segments].compression = htonl(algo);
 161                 segs[segments].offset = htonl(doffset);
 162
 163                 int len;
 164                 compress((char *)&header[phdr[i].p_offset],
 165                          phdr[i].p_filesz, (char *)(sptr + doffset), &len);
 166                 segs[segments].len = htonl(len);
 167
 168                 /* If the compressed section is larger, then use the
 169                    original stuff */
 170
 171                 if ((unsigned int)len > phdr[i].p_filesz) {
 172                         segs[segments].compression = 0;
 173                         segs[segments].len = htonl(phdr[i].p_filesz);
 174
 175                         memcpy((char *)(sptr + doffset),
 176                                &header[phdr[i].p_offset], phdr[i].p_filesz);
 177                 }
 178
 179                 doffset += ntohl(segs[segments].len);
 180                 osize += ntohl(segs[segments].len);
 181
 182                 segments++;
 183         }
 184
 185         segs[segments].type = PAYLOAD_SEGMENT_ENTRY;
 186         segs[segments++].load_addr = (unsigned long long)htonl(ehdr->e_entry);
 187
 188         *output = sptr;
 189
 190         return (segments * sizeof(struct cbfs_payload_segment)) + osize;
 191
 192       err:
 193         return -1;
 194 }