mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-08-03 08:43:45 +09:00
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>
166 lines
3.3 KiB
C
166 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) 2004-2008 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 rcm_t *rcm = (rcm_t *) (MMAP_RCM);
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udelay(1000);
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rcm->rcr |= RCM_RCR_SOFTRST;
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/* we don't return! */
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return 0;
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};
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int checkcpu(void)
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{
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volatile ccm_t *ccm = (ccm_t *) MMAP_CCM;
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u16 msk;
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u16 id = 0;
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u8 ver;
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puts("CPU: ");
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msk = (ccm->cir >> 6);
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ver = (ccm->cir & 0x003f);
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switch (msk) {
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#ifdef CONFIG_MCF5301x
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case 0x78:
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id = 53010;
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break;
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case 0x77:
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id = 53012;
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break;
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case 0x76:
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id = 53015;
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break;
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case 0x74:
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id = 53011;
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break;
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case 0x73:
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id = 53013;
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break;
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#endif
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#ifdef CONFIG_MCF532x
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case 0x54:
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id = 5329;
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break;
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case 0x59:
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id = 5328;
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break;
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case 0x61:
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id = 5327;
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break;
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case 0x65:
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id = 5373;
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break;
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case 0x68:
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id = 53721;
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break;
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case 0x69:
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id = 5372;
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break;
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case 0x6B:
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id = 5372;
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break;
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#endif
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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 (Mask:%01x Version:%x)\n", id, msk,
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ver);
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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_WATCHDOG)
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/* Called by macro WATCHDOG_RESET */
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void watchdog_reset(void)
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{
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volatile wdog_t *wdp = (wdog_t *) (MMAP_WDOG);
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wdp->sr = 0x5555; /* Count register */
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wdp->sr = 0xAAAA; /* Count register */
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}
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int watchdog_disable(void)
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{
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volatile wdog_t *wdp = (wdog_t *) (MMAP_WDOG);
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/* UserManual, once the wdog is disabled, wdog cannot be re-enabled */
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wdp->cr |= WTM_WCR_HALTED; /* halted watchdog timer */
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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 wdog_t *wdp = (wdog_t *) (MMAP_WDOG);
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u32 wdog_module = 0;
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/* set timeout and enable watchdog */
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wdog_module = ((CONFIG_SYS_CLK / 1000) * CONFIG_WATCHDOG_TIMEOUT);
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#ifdef CONFIG_M5329
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wdp->mr = (wdog_module / 8192);
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#else
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wdp->mr = (wdog_module / 4096);
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#endif
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wdp->cr = WTM_WCR_EN;
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puts("WATCHDOG:enabled\n");
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return (0);
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}
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#endif /* CONFIG_WATCHDOG */
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#if 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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return mcffec_initialize(bis);
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}
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#endif
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