mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-07-09 04:36:16 +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>
90 lines
2.5 KiB
C
90 lines
2.5 KiB
C
/*
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* Copyright (C) 2005-2006 Atmel Corporation
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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/io.h>
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#include <asm/sections.h>
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#include <asm/sysreg.h>
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#include <asm/arch/clk.h>
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#include <asm/arch/memory-map.h>
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#include "hsmc3.h"
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/* Sanity checks */
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#if (CONFIG_SYS_CLKDIV_CPU > CONFIG_SYS_CLKDIV_HSB) \
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|| (CONFIG_SYS_CLKDIV_HSB > CONFIG_SYS_CLKDIV_PBA) \
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|| (CONFIG_SYS_CLKDIV_HSB > CONFIG_SYS_CLKDIV_PBB)
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# error Constraint fCPU >= fHSB >= fPB{A,B} violated
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#endif
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#if defined(CONFIG_PLL) && ((CONFIG_SYS_PLL0_MUL < 1) || (CONFIG_SYS_PLL0_DIV < 1))
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# error Invalid PLL multiplier and/or divider
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#endif
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DECLARE_GLOBAL_DATA_PTR;
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int cpu_init(void)
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{
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extern void _evba(void);
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gd->cpu_hz = CONFIG_SYS_OSC0_HZ;
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/* TODO: Move somewhere else, but needs to be run before we
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* increase the clock frequency. */
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hsmc3_writel(MODE0, 0x00031103);
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hsmc3_writel(CYCLE0, 0x000c000d);
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hsmc3_writel(PULSE0, 0x0b0a0906);
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hsmc3_writel(SETUP0, 0x00010002);
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clk_init();
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/* Update the CPU speed according to the PLL configuration */
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gd->cpu_hz = get_cpu_clk_rate();
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/* Set up the exception handler table and enable exceptions */
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sysreg_write(EVBA, (unsigned long)&_evba);
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asm volatile("csrf %0" : : "i"(SYSREG_EM_OFFSET));
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return 0;
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}
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void prepare_to_boot(void)
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{
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/* Flush both caches and the write buffer */
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asm volatile("cache %0[4], 010\n\t"
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"cache %0[0], 000\n\t"
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"sync 0" : : "r"(0) : "memory");
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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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/* This will reset the CPU core, caches, MMU and all internal busses */
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__builtin_mtdr(8, 1 << 13); /* set DC:DBE */
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__builtin_mtdr(8, 1 << 30); /* set DC:RES */
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/* Flush the pipeline before we declare it a failure */
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asm volatile("sub pc, pc, -4");
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return -1;
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}
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