Commit graph

10 commits

Author SHA1 Message Date
Wolfgang Denk
54841ab50c Make sure that argv[] argument pointers are not modified.
The hush shell dynamically allocates (and re-allocates) memory for the
argument strings in the "char *argv[]" argument vector passed to
commands.  Any code that modifies these pointers will cause serious
corruption of the malloc data structures and crash U-Boot, so make
sure the compiler can check that no such modifications are being done
by changing the code into "char * const argv[]".

This modification is the result of debugging a strange crash caused
after adding a new command, which used the following argument
processing code which has been working perfectly fine in all Unix
systems since version 6 - but not so in U-Boot:

int main (int argc, char **argv)
{
	while (--argc > 0 && **++argv == '-') {
/* ====> */	while (*++*argv) {
			switch (**argv) {
			case 'd':
				debug++;
				break;
			...
			default:
				usage ();
			}
		}
	}
	...
}

The line marked "====>" will corrupt the malloc data structures and
usually cause U-Boot to crash when the next command gets executed by
the shell.  With the modification, the compiler will prevent this with
an
	error: increment of read-only location '*argv'

N.B.: The code above can be trivially rewritten like this:

	while (--argc > 0 && **++argv == '-') {
		char *arg = *argv;
		while (*++arg) {
			switch (*arg) {
			...

Signed-off-by: Wolfgang Denk <wd@denx.de>
Acked-by: Mike Frysinger <vapier@gentoo.org>
2010-07-04 23:55:42 +02:00
Peter Tyser
b5650c5d8c ppc: Remove board-specific command table relocation fixups
Signed-off-by: Peter Tyser <ptyser@xes-inc.com>
2009-10-03 10:17:56 +02:00
Detlev Zundel
0b40bd439a digsy_mtc: Add delay in SPI transfers to the companion controller.
While at it, remove initialization of variables which will be set
before usage in all cases.

Signed-off-by: Detlev Zundel <dzu@denx.de>
2009-08-09 23:01:07 +02:00
Anatolij Gustschin
0bf00750e0 digsy_mtc: minor fixes for mtc command help
Add mtc state subcommand description to the
help of mtc command.

Remove some newlines in description of commands
for proper help formating.

Signed-off-by: Anatolij Gustschin <agust@denx.de>
2009-08-09 23:00:08 +02:00
Grzegorz Bernacki
5cc6908418 digsy_mtc: Add mtc state command.
Signed-off-by: Grzegorz Bernacki <gjb@semihalf.com>
2009-08-09 22:59:27 +02:00
Wolfgang Denk
8e5e9b940c Coding style cleanup; update CHANGELOG
Signed-off-by: Wolfgang Denk <wd@denx.de>
2009-07-07 22:35:02 +02:00
Grzegorz Bernacki
12304871bc digsy MTC: Add 'mtc' command.
New command allows to:
     o check FW version
     o set LED status
     o set digital output status
     o get digital input status

Signed-off-by: Grzegorz Bernacki <gjb@semihalf.com>
2009-06-14 23:04:37 +02:00
Grzegorz Bernacki
f1f66edfc7 digsy MTC: Add SPI support.
Signed-off-by: Grzegorz Bernacki <gjb@semihalf.com>
2009-06-14 23:03:57 +02:00
Wolfgang Denk
c0a14aedc3 Update CHANGELOG, coding style cleanup. 2009-04-05 00:27:57 +02:00
Grzegorz Bernacki
5c4fa9b474 Add support for the digsy MTC board.
This is the InterControl custom device based on the MPC5200B chip.

Signed-off-by: Grzegorz Bernacki <gjb@semihalf.com>
2009-03-20 22:39:14 +01:00