4 * Copyright (C) 2008 Jordan Crouse <jordan@cosmicpenguin.net>
5 * 2009 coresystems GmbH
6 * written by Patrick Georgi <patrick.georgi@coresystems.de>
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.
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.
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
34 unsigned int idemp(unsigned int x)
39 /* This is a wrapper around the swab32() macro to make it
40 * usable for the current implementation of parse_elf_to_stage()
42 static unsigned int swap32(unsigned int x)
47 unsigned int (*elf32_to_native) (unsigned int) = idemp;
49 /* returns size of result, or -1 if error */
50 int parse_elf_to_stage(unsigned char *input, unsigned char **output,
51 comp_algo algo, uint32_t * location)
54 Elf32_Ehdr *ehdr = (Elf32_Ehdr *) input;
55 char *header, *buffer;
60 struct cbfs_stage *stage;
61 unsigned int data_start, data_end, mem_end;
63 int elf_bigendian = 0;
65 comp_func_ptr compress = compression_function(algo);
70 fprintf(stderr, "E: The incoming file is not an ELF\n");
74 if (ehdr->e_ident[EI_DATA] == ELFDATA2MSB) {
77 if (elf_bigendian != host_bigendian) {
78 elf32_to_native = swap32;
81 headers = ehdr->e_phnum;
82 header = (char *)ehdr;
84 phdr = (Elf32_Phdr *) & header[elf32_to_native(ehdr->e_phoff)];
86 /* Now, regular headers - we only care about PT_LOAD headers,
87 * because thats what we're actually going to load
90 data_start = 0xFFFFFFFF;
94 for (i = 0; i < headers; i++) {
95 unsigned int start, mend, rend;
97 if (elf32_to_native(phdr[i].p_type) != PT_LOAD)
100 /* Empty segments are never interesting */
101 if (elf32_to_native(phdr[i].p_memsz) == 0)
106 start = elf32_to_native(phdr[i].p_paddr);
108 mend = start + elf32_to_native(phdr[i].p_memsz);
109 rend = start + elf32_to_native(phdr[i].p_filesz);
111 if (start < data_start)
121 if (data_start < *location) {
122 data_start = *location;
125 if (data_end <= data_start) {
126 fprintf(stderr, "E: data ends before it starts. Make sure the ELF file is correct and resides in ROM space.\n");
130 /* allocate an intermediate buffer for the data */
131 buffer = calloc(data_end - data_start, 1);
133 if (buffer == NULL) {
134 fprintf(stderr, "E: Unable to allocate memory: %m\n");
138 /* Copy the file data into the buffer */
140 for (i = 0; i < headers; i++) {
141 unsigned int l_start, l_offset = 0;
143 if (elf32_to_native(phdr[i].p_type) != PT_LOAD)
146 if (elf32_to_native(phdr[i].p_memsz) == 0)
149 l_start = elf32_to_native(phdr[i].p_paddr);
150 if (l_start < *location) {
151 l_offset = *location - l_start;
155 memcpy(buffer + (l_start - data_start),
156 &header[elf32_to_native(phdr[i].p_offset)+l_offset],
157 elf32_to_native(phdr[i].p_filesz)-l_offset);
160 /* Now make the output buffer */
161 out = calloc(sizeof(struct cbfs_stage) + data_end - data_start, 1);
164 fprintf(stderr, "E: Unable to allocate memory: %m\n");
168 stage = (struct cbfs_stage *)out;
170 stage->load = data_start; /* FIXME: htonll */
171 stage->memlen = mem_end - data_start;
172 stage->compression = algo;
173 stage->entry = ehdr->e_entry; /* FIXME: htonll */
175 compress(buffer, data_end - data_start,
176 (char *)(out + sizeof(struct cbfs_stage)), (int *)&stage->len);
181 *location -= sizeof(struct cbfs_stage);
182 return sizeof(struct cbfs_stage) + stage->len;