Re: Strange interpreter behaviour

[Bruno Ducrot <ducrot-kk6yZipjEM5g9hUCZPvPmw@public.gmane.org>]

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On Tue, Jan 17, 2006 at 03:28:44PM +0100, Janosch Machowinski wrote:
> >
> >Ok.  Well maybe that little tool attached could give us the
> >information.
> >
> Nope, scotchmobil pmtools # ./a.out
> read: Bad address

Sometimes I'm stupid.  Try this version instead.


-- 
Bruno Ducrot

--  Which is worse:  ignorance or apathy?
--  Don't know.  Don't care.

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#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

#include <sys/types.h>
#include <sys/stat.h>
#include <sys/mman.h>


int main(void)
{
	int fd;
	off_t c;
	unsigned char *p;

	fd = open("/dev/mem", O_RDONLY);
	if (fd < 0) {
		perror("open /dev/mem");
		exit(1);
	}

	/*
	 * SS1,    1,	<- 0
	 * SS2,    1,
	 * SS3,    1,
	 * SS4,    1,
	 * Offset (0x01),
	 * IOST,   16,	<-   1, 2
	 * SPIO,   16,	<-   3, 4
	 * PMBS,   16,	<-   5, 6
	 * PMLN,   8,	<-   7
	 * SMBS,   16,	<-   8, 9
	 * SMLN,   8,	<-   A
	 * IO1B,   16,	<-   B, C
	 * IO1L,   8,	<-   D
	 * IO2B,   16,	<-   E, F
	 * IO2L,   8,
	 * TOPM,   32,
	 * ROMS,   32,
	 */

	p = mmap(NULL, 1024, PROT_READ, MAP_SHARED, fd, 0x1FF50000);
	if (p == MAP_FAILED) {
		perror("mmap");
		exit(1);
	}
	close(fd);
	printf("0x%x\n", ((p[0x64 + 0xf] & 0xff) << 8) | (p[0x64 + 0xe] & 0xff));
	munmap(p, 1024);

	return 0;
}