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Ronald G. Minnich5d01ec02009-03-31 11:57:36 +00001/*
Peter Stuge45ae92ff2009-04-14 19:48:32 +00002 * cbfs-mkpayload
Ronald G. Minnich5d01ec02009-03-31 11:57:36 +00003 *
4 * Copyright (C) 2008 Jordan Crouse <jordan@cosmicpenguin.net>
Patrick Georgib7b56dd82009-09-14 13:29:27 +00005 * 2009 coresystems GmbH
6 * written by Patrick Georgi <patrick.georgi@coresystems.de>
Ronald G. Minnich5d01ec02009-03-31 11:57:36 +00007 *
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"
Patrick Georgib7b56dd82009-09-14 13:29:27 +000033#include "cbfs.h"
Ronald G. Minnich5d01ec02009-03-31 11:57:36 +000034
Patrick Georgib7b56dd82009-09-14 13:29:27 +000035int parse_elf_to_payload(unsigned char *input, unsigned char **output,
36 comp_algo algo)
Ronald G. Minnich5d01ec02009-03-31 11:57:36 +000037{
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;
Peter Stuge1d862de2009-04-14 00:08:34 +000048 struct cbfs_payload_segment *segs;
Ronald G. Minnich5d01ec02009-03-31 11:57:36 +000049 int i;
50
Cristi Magherusan19a99c62009-09-25 22:21:47 +000051 if(!iself(input)){
52 printf("Fatal error: the payload file is not in ELF format!\n");
53 exit(1);
54 }
55
56
Patrick Georgib7b56dd82009-09-14 13:29:27 +000057 comp_func_ptr compress = compression_function(algo);
58 if (!compress)
59 return -1;
60
Ronald G. Minnich5d01ec02009-03-31 11:57:36 +000061 ehdr = (Elf32_Ehdr *) input;
62 headers = ehdr->e_phnum;
63 header = (char *)ehdr;
64
65 phdr = (Elf32_Phdr *) & (header[ehdr->e_phoff]);
66 shdr = (Elf32_Shdr *) & (header[ehdr->e_shoff]);
67
68 strtab = &header[shdr[ehdr->e_shstrndx].sh_offset];
69
70 /* Count the number of headers - look for the .notes.pinfo
71 * section */
72
73 for (i = 0; i < ehdr->e_shnum; i++) {
74 char *name;
75
76 if (i == ehdr->e_shstrndx)
77 continue;
78
79 if (shdr[i].sh_size == 0)
80 continue;
81
82 name = (char *)(strtab + shdr[i].sh_name);
83
Ronald G. Minnich5a1af7b2009-09-17 15:35:08 +000084 if (!strcmp(name, ".note.pinfo")) {
Ronald G. Minnich5d01ec02009-03-31 11:57:36 +000085 segments++;
Ronald G. Minnich5a1af7b2009-09-17 15:35:08 +000086 isize += (unsigned int)shdr[i].sh_size;
87 }
Ronald G. Minnich5d01ec02009-03-31 11:57:36 +000088 }
89
90 /* Now, regular headers - we only care about PT_LOAD headers,
91 * because thats what we're actually going to load
92 */
93
94 for (i = 0; i < headers; i++) {
95 if (phdr[i].p_type != PT_LOAD)
96 continue;
97
98 /* Empty segments are never interesting */
99 if (phdr[i].p_memsz == 0)
100 continue;
101
102 isize += phdr[i].p_filesz;
103
104 segments++;
105 }
106
107 /* Allocate a block of memory to store the data in */
108
109 sptr =
Patrick Georgib7b56dd82009-09-14 13:29:27 +0000110 calloc((segments * sizeof(struct cbfs_payload_segment)) + isize, 1);
Peter Stuge1d862de2009-04-14 00:08:34 +0000111 doffset = (segments * sizeof(struct cbfs_payload_segment));
Ronald G. Minnich5d01ec02009-03-31 11:57:36 +0000112
113 if (sptr == NULL)
114 goto err;
115
Peter Stuge1d862de2009-04-14 00:08:34 +0000116 segs = (struct cbfs_payload_segment *)sptr;
Ronald G. Minnich5d01ec02009-03-31 11:57:36 +0000117 segments = 0;
118
119 for (i = 0; i < ehdr->e_shnum; i++) {
120 char *name;
121
122 if (i == ehdr->e_shstrndx)
123 continue;
124
125 if (shdr[i].sh_size == 0)
126 continue;
127
128 name = (char *)(strtab + shdr[i].sh_name);
129
130 if (!strcmp(name, ".note.pinfo")) {
131 segs[segments].type = PAYLOAD_SEGMENT_PARAMS;
132 segs[segments].load_addr = 0;
133 segs[segments].len = (unsigned int)shdr[i].sh_size;
134 segs[segments].offset = doffset;
135
136 memcpy((unsigned long *)(sptr + doffset),
137 &header[shdr[i].sh_offset], shdr[i].sh_size);
138
139 doffset += segs[segments].len;
140 osize += segs[segments].len;
141
142 segments++;
143 }
144 }
145
146 for (i = 0; i < headers; i++) {
147 if (phdr[i].p_type != PT_LOAD)
148 continue;
149
150 if (phdr[i].p_memsz == 0)
151 continue;
152
153 if (phdr[i].p_filesz == 0) {
154 segs[segments].type = PAYLOAD_SEGMENT_BSS;
155 segs[segments].load_addr =
156 (unsigned long long)htonl(phdr[i].p_paddr);
Patrick Georgib7b56dd82009-09-14 13:29:27 +0000157 segs[segments].mem_len =
158 (unsigned int)htonl(phdr[i].p_memsz);
Ronald G. Minnich5d01ec02009-03-31 11:57:36 +0000159 segs[segments].offset = htonl(doffset);
160
161 segments++;
162 continue;
163 }
164
165 segs[segments].type = PAYLOAD_SEGMENT_DATA;
166 segs[segments].load_addr = (unsigned int)htonl(phdr[i].p_paddr);
167 segs[segments].mem_len = (unsigned int)htonl(phdr[i].p_memsz);
168 segs[segments].compression = htonl(algo);
169 segs[segments].offset = htonl(doffset);
170
171 int len;
172 compress((char *)&header[phdr[i].p_offset],
Patrick Georgib7b56dd82009-09-14 13:29:27 +0000173 phdr[i].p_filesz, (char *)(sptr + doffset), &len);
Ronald G. Minnich5d01ec02009-03-31 11:57:36 +0000174 segs[segments].len = htonl(len);
175
176 /* If the compressed section is larger, then use the
177 original stuff */
178
Stefan Reinauer14ad50e2009-04-04 22:18:26 +0000179 if ((unsigned int)len > phdr[i].p_filesz) {
Ronald G. Minnich5d01ec02009-03-31 11:57:36 +0000180 segs[segments].compression = 0;
181 segs[segments].len = htonl(phdr[i].p_filesz);
182
183 memcpy((char *)(sptr + doffset),
184 &header[phdr[i].p_offset], phdr[i].p_filesz);
185 }
186
187 doffset += ntohl(segs[segments].len);
188 osize += ntohl(segs[segments].len);
189
190 segments++;
191 }
192
193 segs[segments].type = PAYLOAD_SEGMENT_ENTRY;
194 segs[segments++].load_addr = (unsigned long long)htonl(ehdr->e_entry);
195
196 *output = sptr;
197
Peter Stuge1d862de2009-04-14 00:08:34 +0000198 return (segments * sizeof(struct cbfs_payload_segment)) + osize;
Ronald G. Minnich5d01ec02009-03-31 11:57:36 +0000199
Patrick Georgib7b56dd82009-09-14 13:29:27 +0000200 err:
Ronald G. Minnich5d01ec02009-03-31 11:57:36 +0000201 return -1;
202}