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54841ab50c
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>
165 lines
3.3 KiB
C
165 lines
3.3 KiB
C
/*
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*
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* (C) Copyright 2000-2003
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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*
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* Copyright (C) 2004-2007 Freescale Semiconductor, Inc.
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* TsiChung Liew (Tsi-Chung.Liew@freescale.com)
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <common.h>
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#include <watchdog.h>
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#include <command.h>
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#include <netdev.h>
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#include <asm/immap.h>
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DECLARE_GLOBAL_DATA_PTR;
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int do_reset(cmd_tbl_t * cmdtp, bd_t * bd, int flag, int argc, char * const argv[])
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{
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volatile gptmr_t *gptmr = (gptmr_t *) (MMAP_GPTMR);
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gptmr->pre = 10;
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gptmr->cnt = 1;
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/* enable watchdog, set timeout to 0 and wait */
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gptmr->mode = GPT_TMS_SGPIO;
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gptmr->ctrl = GPT_CTRL_WDEN | GPT_CTRL_CE;
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/* we don't return! */
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return 1;
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};
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int checkcpu(void)
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{
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volatile siu_t *siu = (siu_t *) MMAP_SIU;
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u16 id = 0;
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puts("CPU: ");
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switch ((siu->jtagid & 0x000FF000) >> 12) {
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case 0x0C:
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id = 5485;
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break;
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case 0x0D:
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id = 5484;
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break;
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case 0x0E:
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id = 5483;
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break;
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case 0x0F:
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id = 5482;
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break;
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case 0x10:
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id = 5481;
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break;
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case 0x11:
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id = 5480;
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break;
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case 0x12:
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id = 5475;
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break;
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case 0x13:
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id = 5474;
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break;
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case 0x14:
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id = 5473;
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break;
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case 0x15:
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id = 5472;
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break;
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case 0x16:
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id = 5471;
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break;
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case 0x17:
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id = 5470;
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break;
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}
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if (id) {
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char buf1[32], buf2[32];
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printf("Freescale MCF%d\n", id);
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printf(" CPU CLK %s MHz BUS CLK %s MHz\n",
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strmhz(buf1, gd->cpu_clk),
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strmhz(buf2, gd->bus_clk));
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}
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return 0;
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};
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#if defined(CONFIG_HW_WATCHDOG)
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/* Called by macro WATCHDOG_RESET */
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void hw_watchdog_reset(void)
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{
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volatile gptmr_t *gptmr = (gptmr_t *) (MMAP_GPTMR);
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gptmr->ocpw = 0xa5;
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}
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int watchdog_disable(void)
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{
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volatile gptmr_t *gptmr = (gptmr_t *) (MMAP_GPTMR);
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/* UserManual, once the wdog is disabled, wdog cannot be re-enabled */
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gptmr->mode = 0;
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gptmr->ctrl = 0;
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puts("WATCHDOG:disabled\n");
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return (0);
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}
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int watchdog_init(void)
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{
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volatile gptmr_t *gptmr = (gptmr_t *) (MMAP_GPTMR);
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gptmr->pre = CONFIG_WATCHDOG_TIMEOUT;
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gptmr->cnt = CONFIG_SYS_TIMER_PRESCALER * 1000;
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gptmr->mode = GPT_TMS_SGPIO;
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gptmr->ctrl = GPT_CTRL_CE | GPT_CTRL_WDEN;
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puts("WATCHDOG:enabled\n");
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return (0);
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}
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#endif /* CONFIG_HW_WATCHDOG */
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#if defined(CONFIG_FSLDMAFEC) || defined(CONFIG_MCFFEC)
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/* Default initializations for MCFFEC controllers. To override,
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* create a board-specific function called:
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* int board_eth_init(bd_t *bis)
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*/
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int cpu_eth_init(bd_t *bis)
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{
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#if defined(CONFIG_FSLDMAFEC)
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mcdmafec_initialize(bis);
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#endif
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#if defined(CONFIG_MCFFEC)
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mcffec_initialize(bis);
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#endif
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return 0;
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}
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#endif
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