mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-08-05 01:33:44 +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>
99 lines
1.9 KiB
C
99 lines
1.9 KiB
C
/*
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* Copyright (C) 2007,2008 Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
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* Copyright (C) 2008 Renesas Solutions Corp.
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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 <command.h>
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#include <asm/processor.h>
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#include <asm/io.h>
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#define STBCR4 0xFFFE040C
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#define cmt_clock_enable() do {\
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writeb(readb(STBCR4) & ~0x04, STBCR4);\
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} while (0)
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#define scif0_enable() do {\
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writeb(readb(STBCR4) & ~0x80, STBCR4);\
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} while (0)
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int checkcpu(void)
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{
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#if defined(CONFIG_SH2A)
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puts("CPU: SH2A\n");
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#else
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puts("CPU: SH2\n");
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#endif
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return 0;
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}
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int cpu_init(void)
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{
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/* SCIF enable */
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scif0_enable();
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/* CMT clock enable */
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cmt_clock_enable() ;
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return 0;
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}
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int cleanup_before_linux(void)
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{
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disable_interrupts();
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return 0;
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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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disable_interrupts();
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reset_cpu(0);
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return 0;
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}
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void flush_cache(unsigned long addr, unsigned long size)
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{
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}
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void icache_enable(void)
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{
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}
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void icache_disable(void)
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{
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}
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int icache_status(void)
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{
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return 0;
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}
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void dcache_enable(void)
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{
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}
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void dcache_disable(void)
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{
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}
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int dcache_status(void)
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{
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return 0;
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}
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