mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-07-10 13:16:16 +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>
413 lines
7.5 KiB
C
413 lines
7.5 KiB
C
/*
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* (C) Copyright 2007 Michal Simek
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*
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* Michal SIMEK <monstr@monstr.eu>
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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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* Microblaze FSL support
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*/
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#include <common.h>
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#include <config.h>
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#include <command.h>
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#include <asm/asm.h>
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int do_frd (cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
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{
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unsigned int fslnum;
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unsigned int num;
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unsigned int blocking;
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if (argc < 2) {
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cmd_usage(cmdtp);
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return 1;
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}
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fslnum = (unsigned int)simple_strtoul (argv[1], NULL, 16);
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blocking = (unsigned int)simple_strtoul (argv[2], NULL, 16);
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if (fslnum < 0 || fslnum >= XILINX_FSL_NUMBER) {
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puts ("Bad number of FSL\n");
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cmd_usage(cmdtp);
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return 1;
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}
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switch (fslnum) {
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#if (XILINX_FSL_NUMBER > 0)
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case 0:
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switch (blocking) {
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case 0: NGET (num, 0);
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break;
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case 1: NCGET (num, 0);
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break;
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case 2: GET (num, 0);
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break;
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case 3: CGET (num, 0);
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break;
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default:
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return 2;
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}
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break;
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#endif
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#if (XILINX_FSL_NUMBER > 1)
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case 1:
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switch (blocking) {
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case 0: NGET (num, 1);
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break;
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case 1: NCGET (num, 1);
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break;
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case 2: GET (num, 1);
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break;
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case 3: CGET (num, 1);
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break;
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default:
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return 2;
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}
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break;
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#endif
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#if (XILINX_FSL_NUMBER > 2)
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case 2:
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switch (blocking) {
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case 0: NGET (num, 2);
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break;
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case 1: NCGET (num, 2);
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break;
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case 2: GET (num, 2);
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break;
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case 3: CGET (num, 2);
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break;
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default:
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return 2;
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}
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break;
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#endif
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#if (XILINX_FSL_NUMBER > 3)
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case 3:
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switch (blocking) {
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case 0: NGET (num, 3);
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break;
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case 1: NCGET (num, 3);
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break;
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case 2: GET (num, 3);
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break;
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case 3: CGET (num, 3);
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break;
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default:
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return 2;
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}
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break;
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#endif
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#if (XILINX_FSL_NUMBER > 4)
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case 4:
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switch (blocking) {
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case 0: NGET (num, 4);
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break;
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case 1: NCGET (num, 4);
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break;
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case 2: GET (num, 4);
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break;
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case 3: CGET (num, 4);
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break;
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default:
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return 2;
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}
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break;
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#endif
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#if (XILINX_FSL_NUMBER > 5)
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case 5:
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switch (blocking) {
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case 0: NGET (num, 5);
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break;
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case 1: NCGET (num, 5);
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break;
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case 2: GET (num, 5);
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break;
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case 3: CGET (num, 5);
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break;
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default:
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return 2;
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}
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break;
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#endif
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#if (XILINX_FSL_NUMBER > 6)
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case 6:
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switch (blocking) {
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case 0: NGET (num, 6);
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break;
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case 1: NCGET (num, 6);
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break;
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case 2: GET (num, 6);
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break;
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case 3: CGET (num, 6);
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break;
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default:
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return 2;
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}
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break;
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#endif
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#if (XILINX_FSL_NUMBER > 7)
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case 7:
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switch (blocking) {
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case 0: NGET (num, 7);
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break;
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case 1: NCGET (num, 7);
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break;
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case 2: GET (num, 7);
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break;
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case 3: CGET (num, 7);
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break;
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default:
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return 2;
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}
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break;
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#endif
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default:
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return 1;
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}
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printf ("%01x: 0x%08x - %s %s read\n", fslnum, num,
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blocking < 2 ? "non blocking" : "blocking",
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((blocking == 1) || (blocking == 3)) ? "control" : "data" );
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return 0;
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}
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int do_fwr (cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
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{
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unsigned int fslnum;
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unsigned int num;
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unsigned int blocking;
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if (argc < 3) {
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cmd_usage(cmdtp);
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return 1;
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}
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fslnum = (unsigned int)simple_strtoul (argv[1], NULL, 16);
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num = (unsigned int)simple_strtoul (argv[2], NULL, 16);
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blocking = (unsigned int)simple_strtoul (argv[3], NULL, 16);
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if (fslnum < 0 || fslnum >= XILINX_FSL_NUMBER) {
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cmd_usage(cmdtp);
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return 1;
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}
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switch (fslnum) {
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#if (XILINX_FSL_NUMBER > 0)
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case 0:
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switch (blocking) {
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case 0: NPUT (num, 0);
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break;
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case 1: NCPUT (num, 0);
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break;
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case 2: PUT (num, 0);
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break;
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case 3: CPUT (num, 0);
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break;
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default:
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return 2;
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}
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break;
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#endif
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#if (XILINX_FSL_NUMBER > 1)
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case 1:
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switch (blocking) {
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case 0: NPUT (num, 1);
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break;
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case 1: NCPUT (num, 1);
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break;
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case 2: PUT (num, 1);
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break;
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case 3: CPUT (num, 1);
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break;
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default:
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return 2;
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}
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break;
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#endif
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#if (XILINX_FSL_NUMBER > 2)
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case 2:
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switch (blocking) {
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case 0: NPUT (num, 2);
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break;
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case 1: NCPUT (num, 2);
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break;
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case 2: PUT (num, 2);
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break;
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case 3: CPUT (num, 2);
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break;
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default:
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return 2;
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}
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break;
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#endif
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#if (XILINX_FSL_NUMBER > 3)
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case 3:
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switch (blocking) {
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case 0: NPUT (num, 3);
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break;
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case 1: NCPUT (num, 3);
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break;
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case 2: PUT (num, 3);
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break;
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case 3: CPUT (num, 3);
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break;
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default:
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return 2;
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}
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break;
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#endif
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#if (XILINX_FSL_NUMBER > 4)
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case 4:
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switch (blocking) {
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case 0: NPUT (num, 4);
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break;
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case 1: NCPUT (num, 4);
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break;
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case 2: PUT (num, 4);
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break;
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case 3: CPUT (num, 4);
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break;
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default:
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return 2;
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}
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break;
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#endif
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#if (XILINX_FSL_NUMBER > 5)
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case 5:
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switch (blocking) {
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case 0: NPUT (num, 5);
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break;
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case 1: NCPUT (num, 5);
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break;
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case 2: PUT (num, 5);
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break;
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case 3: CPUT (num, 5);
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break;
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default:
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return 2;
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}
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break;
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#endif
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#if (XILINX_FSL_NUMBER > 6)
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case 6:
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switch (blocking) {
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case 0: NPUT (num, 6);
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break;
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case 1: NCPUT (num, 6);
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break;
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case 2: PUT (num, 6);
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break;
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case 3: CPUT (num, 6);
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break;
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default:
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return 2;
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}
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break;
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#endif
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#if (XILINX_FSL_NUMBER > 7)
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case 7:
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switch (blocking) {
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case 0: NPUT (num, 7);
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break;
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case 1: NCPUT (num, 7);
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break;
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case 2: PUT (num, 7);
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break;
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case 3: CPUT (num, 7);
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break;
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default:
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return 2;
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}
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break;
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#endif
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default:
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return 1;
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}
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printf ("%01x: 0x%08x - %s %s write\n", fslnum, num,
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blocking < 2 ? "non blocking" : "blocking",
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((blocking == 1) || (blocking == 3)) ? "control" : "data" );
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return 0;
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}
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int do_rspr (cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
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{
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unsigned int reg = 0;
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unsigned int val = 0;
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if (argc < 2) {
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cmd_usage(cmdtp);
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return 1;
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}
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reg = (unsigned int)simple_strtoul (argv[1], NULL, 16);
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val = (unsigned int)simple_strtoul (argv[2], NULL, 16);
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switch (reg) {
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case 0x1:
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if (argc > 2) {
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MTS (val, rmsr);
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NOP;
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MFS (val, rmsr);
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} else {
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MFS (val, rmsr);
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}
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puts ("MSR");
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break;
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case 0x3:
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MFS (val, rear);
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puts ("EAR");
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break;
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case 0x5:
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MFS (val, resr);
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puts ("ESR");
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break;
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default:
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puts ("Unsupported register\n");
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return 1;
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}
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printf (": 0x%08x\n", val);
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return 0;
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}
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/***************************************************/
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U_BOOT_CMD (frd, 3, 1, do_frd,
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"read data from FSL",
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"- [fslnum [0|1|2|3]]\n"
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" 0 - non blocking data read\n"
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" 1 - non blocking control read\n"
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" 2 - blocking data read\n"
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" 3 - blocking control read");
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U_BOOT_CMD (fwr, 4, 1, do_fwr,
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"write data to FSL",
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"- [fslnum [0|1|2|3]]\n"
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" 0 - non blocking data write\n"
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" 1 - non blocking control write\n"
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" 2 - blocking data write\n"
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" 3 - blocking control write");
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U_BOOT_CMD (rspr, 3, 1, do_rspr,
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"read/write special purpose register",
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"- reg_num [write value] read/write special purpose register\n"
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" 1 - MSR - Machine status register\n"
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" 3 - EAR - Exception address register\n"
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" 5 - ESR - Exception status register");
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