mirror of
git://projects.qi-hardware.com/wernermisc.git
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113 lines
2.2 KiB
C
113 lines
2.2 KiB
C
/*
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* poke.c - Read or write any CPU register
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*
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* Copyright (C) 2008 by OpenMoko, Inc.
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* Written by Werner Almesberger <werner@openmoko.org>
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* All Rights Reserved
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <stdint.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <fcntl.h>
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#include <sys/mman.h>
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#define PAGE_SIZE 4096
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#define MEM(bits, addr) (*(uint##bits##_t *) (mem+((addr) & (PAGE_SIZE-1))))
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static volatile void *mem;
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/* ----- Command-line parsing ---------------------------------------------- */
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static void __attribute__((noreturn)) usage(const char *name)
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{
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fprintf(stderr, "usage: %s [-8|-16|-32] hex_address [value]\n", name);
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exit(1);
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}
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int main(int argc, char **argv)
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{
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int fd;
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char *end;
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unsigned long addr;
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uint32_t val;
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int bits = 32;
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char **args = argv+1;
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fd = open("/dev/mem", O_RDWR);
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if (fd < 0) {
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perror("/dev/mem");
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exit(1);
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}
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if (argc > 1 && *argv[1] == '-') {
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if (!strcmp(argv[1], "-8"))
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bits = 8;
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else if (!strcmp(argv[1], "-16"))
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bits = 16;
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else if (!strcmp(argv[1], "-32"))
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bits = 32;
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else
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usage(*argv);
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args++;
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argc--; /* dirty */
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}
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switch (argc) {
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case 3:
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val = strtoul(args[1], &end, 0);
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if (*end)
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usage(*argv);
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/* fall through */
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case 2:
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addr = strtoul(args[0], &end, 16);
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if (*end)
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usage(*argv);
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break;
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default:
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usage(*argv);
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}
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mem = mmap(NULL, PAGE_SIZE, PROT_READ | PROT_WRITE, MAP_SHARED, fd,
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addr & ~(PAGE_SIZE-1));
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if (mem == MAP_FAILED) {
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perror("mmap");
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exit(1);
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}
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if (argc == 2) {
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switch (bits) {
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case 8:
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printf("0x%02lx\n", (unsigned long) MEM(8, addr));
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break;
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case 16:
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printf("0x%04lx\n", (unsigned long) MEM(16, addr));
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break;
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case 32:
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printf("0x%08lx\n", (unsigned long) MEM(32, addr));
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break;
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}
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}
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else {
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switch (bits) {
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case 8:
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MEM(8, addr) = val;
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break;
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case 16:
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MEM(16, addr) = val;
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break;
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case 32:
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MEM(32, addr) = val;
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break;
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}
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}
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return 0;
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}
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