mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-07-05 02:36:39 +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>
105 lines
2.4 KiB
C
105 lines
2.4 KiB
C
/*
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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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* 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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/*
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* CPU specific code for the MPC8220 CPUs
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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 <mpc8220.h>
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#include <netdev.h>
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#include <asm/processor.h>
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DECLARE_GLOBAL_DATA_PTR;
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int checkcpu (void)
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{
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ulong clock = gd->cpu_clk;
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char buf[32];
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puts ("CPU: ");
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printf (CPU_ID_STR);
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printf (" (JTAG ID %08lx)", *(vu_long *) (CONFIG_SYS_MBAR + 0x50));
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printf (" at %s MHz\n", strmhz (buf, clock));
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return 0;
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}
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/* ------------------------------------------------------------------------- */
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int do_reset (cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
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{
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volatile gptmr8220_t *gptmr = (volatile gptmr8220_t *) MMAP_GPTMR;
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ulong msr;
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/* Interrupts and MMU off */
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__asm__ __volatile__ ("mfmsr %0":"=r" (msr):);
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msr &= ~(MSR_ME | MSR_EE | MSR_IR | MSR_DR);
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__asm__ __volatile__ ("mtmsr %0"::"r" (msr));
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/* Charge the watchdog timer */
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gptmr->Prescl = 10;
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gptmr->Count = 1;
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gptmr->Mode = GPT_TMS_SGPIO;
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gptmr->Control = GPT_CTRL_WDEN | GPT_CTRL_CE;
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return 1;
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}
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/* ------------------------------------------------------------------------- */
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/*
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* Get timebase clock frequency (like cpu_clk in Hz)
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*
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*/
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unsigned long get_tbclk (void)
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{
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ulong tbclk;
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tbclk = (gd->bus_clk + 3L) / 4L;
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return (tbclk);
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}
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/* ------------------------------------------------------------------------- */
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/*
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* Initializes on-chip ethernet controllers.
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* to override, implement board_eth_init()
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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_MPC8220_FEC)
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mpc8220_fec_initialize(bis);
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#endif
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return 0;
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}
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