mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-08-11 04:33:46 +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>
88 lines
2.1 KiB
C
88 lines
2.1 KiB
C
/*
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* Copyright (C) 2008 Yoshihiro Shimoda <shimoda.yoshihiro@renesas.com>
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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 <asm/io.h>
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#include <asm/processor.h>
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#include <asm/pci.h>
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#include <netdev.h>
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int checkboard(void)
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{
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puts("BOARD: Renesas Technology Corp. R0P7785LC0011RL\n");
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return 0;
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}
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int board_init(void)
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{
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return 0;
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}
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int dram_init(void)
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{
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DECLARE_GLOBAL_DATA_PTR;
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gd->bd->bi_memstart = CONFIG_SYS_SDRAM_BASE;
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gd->bd->bi_memsize = CONFIG_SYS_SDRAM_SIZE;
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printf("DRAM: %dMB\n", CONFIG_SYS_SDRAM_SIZE / (1024 * 1024));
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return 0;
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}
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static struct pci_controller hose;
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void pci_init_board(void)
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{
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pci_sh7780_init(&hose);
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}
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int board_eth_init(bd_t *bis)
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{
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return pci_eth_init(bis);
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}
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#if defined(CONFIG_SH_32BIT)
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int do_pmb(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
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{
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/* clear ITLB */
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writel(0x00000004, 0xff000010);
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/* delete PMB for peripheral */
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writel(0, PMB_ADDR_BASE(0));
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writel(0, PMB_DATA_BASE(0));
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writel(0, PMB_ADDR_BASE(1));
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writel(0, PMB_DATA_BASE(1));
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writel(0, PMB_ADDR_BASE(2));
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writel(0, PMB_DATA_BASE(2));
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/* add PMB for SDRAM(0x40000000 - 0x47ffffff) */
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writel(mk_pmb_addr_val(0x80), PMB_ADDR_BASE(8));
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writel(mk_pmb_data_val(0x40, 0, 1, 1, 0, 1, 1), PMB_DATA_BASE(8));
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writel(mk_pmb_addr_val(0xa0), PMB_ADDR_BASE(12));
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writel(mk_pmb_data_val(0x40, 1, 1, 1, 0, 0, 1), PMB_DATA_BASE(12));
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return 0;
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}
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U_BOOT_CMD(
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pmb, 1, 1, do_pmb,
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"pmb - PMB setting\n",
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"\n"
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" - PMB setting for all SDRAM mapping"
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);
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#endif
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