u-boot/board/pcippc2
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
..
config.mk Initial revision 2002-01-15 18:58:11 +00:00
cpc710.h Initial revision 2002-10-31 08:57:28 +00:00
cpc710_init_ram.c rename CFG_ macros to CONFIG_SYS 2008-10-18 21:54:03 +02:00
cpc710_pci.c pci: Rename PCI_REGION_MEMORY to PCI_REGION_SYS_MEMORY for clarity 2009-02-07 23:50:04 +01:00
cpc710_pci.h Initial revision 2002-04-01 14:29:03 +00:00
flash.c rename CFG_ macros to CONFIG_SYS 2008-10-18 21:54:03 +02:00
fpga_serial.c GCC-4.x fixes: clean up global data pointer initialization for all boards. 2006-03-31 18:32:53 +02:00
fpga_serial.h Big white-space cleanup. 2008-05-21 00:14:08 +02:00
hardware.h Initial revision 2002-01-15 18:58:11 +00:00
i2c.c rename CFG_ macros to CONFIG_SYS 2008-10-18 21:54:03 +02:00
i2c.h Initial revision 2002-10-31 08:57:28 +00:00
Makefile Move "ar" flags to config.mk to allow for silent "make -s" 2006-10-09 01:02:05 +02:00
ns16550.h Initial revision 2002-01-15 18:58:11 +00:00
pcippc2.c Make sure that argv[] argument pointers are not modified. 2010-07-04 23:55:42 +02:00
pcippc2.h Big white-space cleanup. 2008-05-21 00:14:08 +02:00
pcippc2_fpga.c Initial revision 2002-08-17 09:36:01 +00:00
pcippc2_fpga.h Patch by Guillaume Alexandre,, 04 Nov 2002: 2002-11-04 16:02:40 +00:00
sconsole.c rename CFG_ macros to CONFIG_SYS 2008-10-18 21:54:03 +02:00
sconsole.h rename CFG_ macros to CONFIG_SYS 2008-10-18 21:54:03 +02:00
u-boot.lds Move arch/ppc to arch/powerpc 2010-04-21 23:42:38 +02:00