mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-11 15:37:23 +00:00
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>
59 lines
1.4 KiB
C
59 lines
1.4 KiB
C
/*
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* cmd_cplbinfo.c - dump the instruction/data cplb tables
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*
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* Copyright (c) 2007-2008 Analog Devices Inc.
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*
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* Licensed under the GPL-2 or later.
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*/
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#include <common.h>
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#include <command.h>
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#include <asm/blackfin.h>
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#include <asm/cplb.h>
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#include <asm/mach-common/bits/mpu.h>
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/*
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* Translate the PAGE_SIZE bits into a human string
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*/
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static const char *cplb_page_size(uint32_t data)
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{
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static const char page_size_string_table[][4] = { "1K", "4K", "1M", "4M" };
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return page_size_string_table[(data & PAGE_SIZE_MASK) >> PAGE_SIZE_SHIFT];
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}
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/*
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* show a hardware cplb table
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*/
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static void show_cplb_table(uint32_t *addr, uint32_t *data)
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{
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int i;
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printf(" Address Data Size Valid Locked\n");
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for (i = 1; i <= 16; ++i) {
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printf(" %2i 0x%p 0x%05X %s %c %c\n",
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i, (void *)*addr, *data,
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cplb_page_size(*data),
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(*data & CPLB_VALID ? 'Y' : 'N'),
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(*data & CPLB_LOCK ? 'Y' : 'N'));
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++addr;
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++data;
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}
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}
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/*
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* display current instruction and data cplb tables
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*/
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int do_cplbinfo(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
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{
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printf("%s CPLB table [%08x]:\n", "Instruction", *(uint32_t *)DMEM_CONTROL);
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show_cplb_table((uint32_t *)ICPLB_ADDR0, (uint32_t *)ICPLB_DATA0);
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printf("%s CPLB table [%08x]:\n", "Data", *(uint32_t *)IMEM_CONTROL);
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show_cplb_table((uint32_t *)DCPLB_ADDR0, (uint32_t *)DCPLB_DATA0);
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return 0;
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}
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U_BOOT_CMD(cplbinfo, 1, 0, do_cplbinfo,
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"display current CPLB tables",
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""
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);
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