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poke/: move over from svn.openmoko.org/developers/werner/poke/

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Thought I had done that already a while ago ...
This commit is contained in:
Werner Almesberger 2012-11-06 09:08:29 -03:00
parent f87f0e6aee
commit 355614bb34
2 changed files with 125 additions and 0 deletions
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13
poke/Makefile Normal file
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# CC=arm-angstrom-linux-gnueabi-gcc
# CC=mipsel-openwrt-linux-uclibc-gcc
CFLAGS=-Wall -g
.PHONY: all clean spotless
all: poke
clean:
rm -f poke
spotless: clean

112
poke/poke.c Normal file
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/*
* poke.c - Read or write any CPU register
*
* Copyright (C) 2008 by OpenMoko, Inc.
* Written by Werner Almesberger <werner@openmoko.org>
* All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#include <stdint.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <fcntl.h>
#include <sys/mman.h>
#define PAGE_SIZE 4096
#define MEM(bits, addr) (*(uint##bits##_t *) (mem+((addr) & (PAGE_SIZE-1))))
static volatile void *mem;
/* ----- Command-line parsing ---------------------------------------------- */
static void __attribute__((noreturn)) usage(const char *name)
{
fprintf(stderr, "usage: %s [-8|-16|-32] hex_address [value]\n", name);
exit(1);
}
int main(int argc, char **argv)
{
int fd;
char *end;
unsigned long addr;
uint32_t val;
int bits = 32;
char **args = argv+1;
fd = open("/dev/mem", O_RDWR);
if (fd < 0) {
perror("/dev/mem");
exit(1);
}
if (argc > 1 && *argv[1] == '-') {
if (!strcmp(argv[1], "-8"))
bits = 8;
else if (!strcmp(argv[1], "-16"))
bits = 16;
else if (!strcmp(argv[1], "-32"))
bits = 32;
else
usage(*argv);
args++;
argc--; /* dirty */
}
switch (argc) {
case 3:
val = strtoul(args[1], &end, 0);
if (*end)
usage(*argv);
/* fall through */
case 2:
addr = strtoul(args[0], &end, 16);
if (*end)
usage(*argv);
break;
default:
usage(*argv);
}
mem = mmap(NULL, PAGE_SIZE, PROT_READ | PROT_WRITE, MAP_SHARED, fd,
addr & ~(PAGE_SIZE-1));
if (mem == MAP_FAILED) {
perror("mmap");
exit(1);
}
if (argc == 2) {
switch (bits) {
case 8:
printf("0x%02lx\n", (unsigned long) MEM(8, addr));
break;
case 16:
printf("0x%04lx\n", (unsigned long) MEM(16, addr));
break;
case 32:
printf("0x%08lx\n", (unsigned long) MEM(32, addr));
break;
}
}
else {
switch (bits) {
case 8:
MEM(8, addr) = val;
break;
case 16:
MEM(16, addr) = val;
break;
case 32:
MEM(32, addr) = val;
break;
}
}
return 0;
}