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Add ELF loader.
[netwatch.git] / aseg / load-aseg.c
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1/*
2 * devmem2.c: Simple program to read/write from/to any location in memory.
3 *
4 * Copyright (C) 2000, Jan-Derk Bakker (J.D.Bakker@its.tudelft.nl)
5 *
6 *
7 * This software has been developed for the LART computing board
8 * (http://www.lart.tudelft.nl/). The development has been sponsored by
9 * the Mobile MultiMedia Communications (http://www.mmc.tudelft.nl/)
10 * and Ubiquitous Communications (http://www.ubicom.tudelft.nl/)
11 * projects.
12 *
13 * The author can be reached at:
14 *
15 * Jan-Derk Bakker
16 * Information and Communication Theory Group
17 * Faculty of Information Technology and Systems
18 * Delft University of Technology
19 * P.O. Box 5031
20 * 2600 GA Delft
21 * The Netherlands
22 *
23 *
24 * This program is free software; you can redistribute it and/or modify
25 * it under the terms of the GNU General Public License as published by
26 * the Free Software Foundation; either version 2 of the License, or
27 * (at your option) any later version.
28 *
29 * This program is distributed in the hope that it will be useful,
30 * but WITHOUT ANY WARRANTY; without even the implied warranty of
31 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
32 * GNU General Public License for more details.
33 *
34 * You should have received a copy of the GNU General Public License
35 * along with this program; if not, write to the Free Software
36 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
37 *
38 */
39
40#include <stdio.h>
41#include <stdlib.h>
42#include <unistd.h>
43#include <string.h>
44#include <errno.h>
45#include <signal.h>
46#include <fcntl.h>
47#include <ctype.h>
48#include <termios.h>
49#include <sys/types.h>
50#include <sys/mman.h>
51#include <sys/stat.h>
52
53
54#define FATAL do { fprintf(stderr, "Error at line %d, file %s (%d) [%s]\n", \
55 __LINE__, __FILE__, errno, strerror(errno)); exit(1); } while(0)
56
57#define MAP_SIZE 4096UL
58#define MAP_MASK (MAP_SIZE - 1)
59
60int main(int argc, char **argv) {
61
62 int fd, input_fd;
63
64 void *map_base, *virt_addr;
65 unsigned long read_result, writeval;
66 off_t target;
67 int access_type = 'w';
68
69 if(argc < 3) {
70 fprintf(stderr, "\nUsage:\t%s { address } { file }\n"
71 "\taddress : memory address to act upon\n"
72 "\tfile : file to load\n\n", argv[0]);
73 exit(1);
74 }
75
76 input_fd = open(argv[2], O_RDONLY);
77 if (input_fd < 0) FATAL;
78
79 struct stat st;
80 if (fstat(input_fd, &st) < 0) FATAL;
81
82 char * buf = malloc(st.st_size);
83 if (!buf) FATAL;
84 if (read(input_fd, buf, st.st_size) != st.st_size) FATAL;
85
86 target = strtoul(argv[1], 0, 0);
87
88 fd = open("/dev/mem", O_RDWR | O_SYNC);
89 if (fd < 0) FATAL;
90
91 printf("/dev/mem opened.\n");
92 fflush(stdout);
93
94 /* Map one page */
95 map_base = mmap(0, MAP_SIZE, PROT_READ | PROT_WRITE,
96 MAP_SHARED, fd, target & ~MAP_MASK);
97
98 if (map_base == (void *) -1) FATAL;
99
100 printf("Memory mapped at address %p.\n", map_base);
101 fflush(stdout);
102
103 virt_addr = map_base + (target & MAP_MASK);
104 memcpy(virt_addr, buf, st.st_size);
105
106 printf("Copied %d bytes.\n", st.st_size);
107
108 return 0;
109}
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