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u-boot/common/cmd_immap.c
Wolfgang Denk 54841ab50c Make sure that argv[] argument pointers are not modified. 
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>
2010-07-04 23:55:42 +02:00

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/*
* (C) Copyright 2000-2003
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
/*
* MPC8xx/MPC8260 Internal Memory Map Functions
*/
#include <common.h>
#include <command.h>
#if defined(CONFIG_8xx) || defined(CONFIG_8260)
#if defined(CONFIG_8xx)
#include <asm/8xx_immap.h>
#include <commproc.h>
#include <asm/iopin_8xx.h>
#elif defined(CONFIG_8260)
#include <asm/immap_8260.h>
#include <asm/cpm_8260.h>
#include <asm/iopin_8260.h>
#endif
DECLARE_GLOBAL_DATA_PTR;
static void
unimplemented ( cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
printf ("Sorry, but the '%s' command has not been implemented\n",
cmdtp->name);
}
int
do_siuinfo (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR;
#if defined(CONFIG_8xx)
volatile sysconf8xx_t *sc = &immap->im_siu_conf;
#elif defined(CONFIG_8260)
volatile sysconf8260_t *sc = &immap->im_siu_conf;
#endif
printf ("SIUMCR= %08x SYPCR = %08x\n", sc->sc_siumcr, sc->sc_sypcr);
#if defined(CONFIG_8xx)
printf ("SWT = %08x\n", sc->sc_swt);
printf ("SIPEND= %08x SIMASK= %08x\n", sc->sc_sipend, sc->sc_simask);
printf ("SIEL = %08x SIVEC = %08x\n", sc->sc_siel, sc->sc_sivec);
printf ("TESR = %08x SDCR = %08x\n", sc->sc_tesr, sc->sc_sdcr);
#elif defined(CONFIG_8260)
printf ("BCR = %08x\n", sc->sc_bcr);
printf ("P_ACR = %02x P_ALRH= %08x P_ALRL= %08x\n",
sc->sc_ppc_acr, sc->sc_ppc_alrh, sc->sc_ppc_alrl);
printf ("L_ACR = %02x L_ALRH= %08x L_ALRL= %08x\n",
sc->sc_lcl_acr, sc->sc_lcl_alrh, sc->sc_lcl_alrl);
printf ("PTESR1= %08x PTESR2= %08x\n", sc->sc_tescr1, sc->sc_tescr2);
printf ("LTESR1= %08x LTESR2= %08x\n", sc->sc_ltescr1, sc->sc_ltescr2);
printf ("PDTEA = %08x PDTEM = %02x\n", sc->sc_pdtea, sc->sc_pdtem);
printf ("LDTEA = %08x LDTEM = %02x\n", sc->sc_ldtea, sc->sc_ldtem);
#endif
return 0;
}
int
do_memcinfo (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR;
#if defined(CONFIG_8xx)
volatile memctl8xx_t *memctl = &immap->im_memctl;
int nbanks = 8;
#elif defined(CONFIG_8260)
volatile memctl8260_t *memctl = &immap->im_memctl;
int nbanks = 12;
#endif
volatile uint *p = &memctl->memc_br0;
int i;
for (i = 0; i < nbanks; i++, p += 2) {
if (i < 10) {
printf ("BR%d = %08x OR%d = %08x\n",
i, p[0], i, p[1]);
} else {
printf ("BR%d = %08x OR%d = %08x\n",
i, p[0], i, p[1]);
}
}
printf ("MAR = %08x", memctl->memc_mar);
#if defined(CONFIG_8xx)
printf (" MCR = %08x\n", memctl->memc_mcr);
#elif defined(CONFIG_8260)
putc ('\n');
#endif
printf ("MAMR = %08x MBMR = %08x",
memctl->memc_mamr, memctl->memc_mbmr);
#if defined(CONFIG_8xx)
printf ("\nMSTAT = %04x\n", memctl->memc_mstat);
#elif defined(CONFIG_8260)
printf (" MCMR = %08x\n", memctl->memc_mcmr);
#endif
printf ("MPTPR = %04x MDR = %08x\n",
memctl->memc_mptpr, memctl->memc_mdr);
#if defined(CONFIG_8260)
printf ("PSDMR = %08x LSDMR = %08x\n",
memctl->memc_psdmr, memctl->memc_lsdmr);
printf ("PURT = %02x PSRT = %02x\n",
memctl->memc_purt, memctl->memc_psrt);
printf ("LURT = %02x LSRT = %02x\n",
memctl->memc_lurt, memctl->memc_lsrt);
printf ("IMMR = %08x\n", memctl->memc_immr);
#endif
return 0;
}
int
do_sitinfo (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
unimplemented (cmdtp, flag, argc, argv);
return 0;
}
#ifdef CONFIG_8260
int
do_icinfo (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
unimplemented (cmdtp, flag, argc, argv);
return 0;
}
#endif
int
do_carinfo (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR;
#if defined(CONFIG_8xx)
volatile car8xx_t *car = &immap->im_clkrst;
#elif defined(CONFIG_8260)
volatile car8260_t *car = &immap->im_clkrst;
#endif
#if defined(CONFIG_8xx)
printf ("SCCR = %08x\n", car->car_sccr);
printf ("PLPRCR= %08x\n", car->car_plprcr);
printf ("RSR = %08x\n", car->car_rsr);
#elif defined(CONFIG_8260)
printf ("SCCR = %08x\n", car->car_sccr);
printf ("SCMR = %08x\n", car->car_scmr);
printf ("RSR = %08x\n", car->car_rsr);
printf ("RMR = %08x\n", car->car_rmr);
#endif
return 0;
}
static int counter;
static void
header(void)
{
char *data = "\
-------------------------------- --------------------------------\
00000000001111111111222222222233 00000000001111111111222222222233\
01234567890123456789012345678901 01234567890123456789012345678901\
-------------------------------- --------------------------------\
";
int i;
if (counter % 2)
putc('\n');
counter = 0;
for (i = 0; i < 4; i++, data += 79)
printf("%.79s\n", data);
}
static void binary (char *label, uint value, int nbits)
{
uint mask = 1 << (nbits - 1);
int i, second = (counter++ % 2);
if (second)
putc (' ');
puts (label);
for (i = 32 + 1; i != nbits; i--)
putc (' ');
while (mask != 0) {
if (value & mask)
putc ('1');
else
putc ('0');
mask >>= 1;
}
if (second)
putc ('\n');
}
#if defined(CONFIG_8xx)
#define PA_NBITS 16
#define PA_NB_ODR 8
#define PB_NBITS 18
#define PB_NB_ODR 16
#define PC_NBITS 12
#define PD_NBITS 13
#elif defined(CONFIG_8260)
#define PA_NBITS 32
#define PA_NB_ODR 32
#define PB_NBITS 28
#define PB_NB_ODR 28
#define PC_NBITS 32
#define PD_NBITS 28
#endif
int
do_iopinfo (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR;
#if defined(CONFIG_8xx)
volatile iop8xx_t *iop = &immap->im_ioport;
volatile ushort *l, *r;
#elif defined(CONFIG_8260)
volatile iop8260_t *iop = &immap->im_ioport;
volatile uint *l, *r;
#endif
volatile uint *R;
counter = 0;
header ();
/*
* Ports A & B
*/
#if defined(CONFIG_8xx)
l = &iop->iop_padir;
R = &immap->im_cpm.cp_pbdir;
#elif defined(CONFIG_8260)
l = &iop->iop_pdira;
R = &iop->iop_pdirb;
#endif
binary ("PA_DIR", *l++, PA_NBITS);
binary ("PB_DIR", *R++, PB_NBITS);
binary ("PA_PAR", *l++, PA_NBITS);
binary ("PB_PAR", *R++, PB_NBITS);
#if defined(CONFIG_8260)
binary ("PA_SOR", *l++, PA_NBITS);
binary ("PB_SOR", *R++, PB_NBITS);
#endif
binary ("PA_ODR", *l++, PA_NB_ODR);
binary ("PB_ODR", *R++, PB_NB_ODR);
binary ("PA_DAT", *l++, PA_NBITS);
binary ("PB_DAT", *R++, PB_NBITS);
header ();
/*
* Ports C & D
*/
#if defined(CONFIG_8xx)
l = &iop->iop_pcdir;
r = &iop->iop_pddir;
#elif defined(CONFIG_8260)
l = &iop->iop_pdirc;
r = &iop->iop_pdird;
#endif
binary ("PC_DIR", *l++, PC_NBITS);
binary ("PD_DIR", *r++, PD_NBITS);
binary ("PC_PAR", *l++, PC_NBITS);
binary ("PD_PAR", *r++, PD_NBITS);
#if defined(CONFIG_8xx)
binary ("PC_SO ", *l++, PC_NBITS);
binary (" ", 0, 0);
r++;
#elif defined(CONFIG_8260)
binary ("PC_SOR", *l++, PC_NBITS);
binary ("PD_SOR", *r++, PD_NBITS);
binary ("PC_ODR", *l++, PC_NBITS);
binary ("PD_ODR", *r++, PD_NBITS);
#endif
binary ("PC_DAT", *l++, PC_NBITS);
binary ("PD_DAT", *r++, PD_NBITS);
#if defined(CONFIG_8xx)
binary ("PC_INT", *l++, PC_NBITS);
#endif
header ();
return 0;
}
/*
* set the io pins
* this needs a clean up for smaller tighter code
* use *uint and set the address based on cmd + port
*/
int
do_iopset (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
uint rcode = 0;
iopin_t iopin;
static uint port = 0;
static uint pin = 0;
static uint value = 0;
static enum {
DIR,
PAR,
SOR,
ODR,
DAT,
#if defined(CONFIG_8xx)
INT
#endif
} cmd = DAT;
if (argc != 5) {
puts ("iopset PORT PIN CMD VALUE\n");
return 1;
}
port = argv[1][0] - 'A';
if (port > 3)
port -= 0x20;
if (port > 3)
rcode = 1;
pin = simple_strtol (argv[2], NULL, 10);
if (pin > 31)
rcode = 1;
switch (argv[3][0]) {
case 'd':
if (argv[3][1] == 'a')
cmd = DAT;
else if (argv[3][1] == 'i')
cmd = DIR;
else
rcode = 1;
break;
case 'p':
cmd = PAR;
break;
case 'o':
cmd = ODR;
break;
case 's':
cmd = SOR;
break;
#if defined(CONFIG_8xx)
case 'i':
cmd = INT;
break;
#endif
default:
printf ("iopset: unknown command %s\n", argv[3]);
rcode = 1;
}
if (argv[4][0] == '1')
value = 1;
else if (argv[4][0] == '0')
value = 0;
else
rcode = 1;
if (rcode == 0) {
iopin.port = port;
iopin.pin = pin;
iopin.flag = 0;
switch (cmd) {
case DIR:
if (value)
iopin_set_out (&iopin);
else
iopin_set_in (&iopin);
break;
case PAR:
if (value)
iopin_set_ded (&iopin);
else
iopin_set_gen (&iopin);
break;
case SOR:
if (value)
iopin_set_opt2 (&iopin);
else
iopin_set_opt1 (&iopin);
break;
case ODR:
if (value)
iopin_set_odr (&iopin);
else
iopin_set_act (&iopin);
break;
case DAT:
if (value)
iopin_set_high (&iopin);
else
iopin_set_low (&iopin);
break;
#if defined(CONFIG_8xx)
case INT:
if (value)
iopin_set_falledge (&iopin);
else
iopin_set_anyedge (&iopin);
break;
#endif
}
}
return rcode;
}
int
do_dmainfo (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
unimplemented (cmdtp, flag, argc, argv);
return 0;
}
int
do_fccinfo (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
unimplemented (cmdtp, flag, argc, argv);
return 0;
}
static void prbrg (int n, uint val)
{
uint extc = (val >> 14) & 3;
uint cd = (val & CPM_BRG_CD_MASK) >> 1;
uint div16 = (val & CPM_BRG_DIV16) != 0;
#if defined(CONFIG_8xx)
ulong clock = gd->cpu_clk;
#elif defined(CONFIG_8260)
ulong clock = gd->brg_clk;
#endif
printf ("BRG%d:", n);
if (val & CPM_BRG_RST)
puts (" RESET");
else
puts (" ");
if (val & CPM_BRG_EN)
puts (" ENABLED");
else
puts (" DISABLED");
printf (" EXTC=%d", extc);
if (val & CPM_BRG_ATB)
puts (" ATB");
else
puts (" ");
printf (" DIVIDER=%4d", cd);
if (extc == 0 && cd != 0) {
uint baudrate;
if (div16)
baudrate = (clock / 16) / (cd + 1);
else
baudrate = clock / (cd + 1);
printf ("=%6d bps", baudrate);
} else {
puts (" ");
}
if (val & CPM_BRG_DIV16)
puts (" DIV16");
else
puts (" ");
putc ('\n');
}
int
do_brginfo (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR;
#if defined(CONFIG_8xx)
volatile cpm8xx_t *cp = &immap->im_cpm;
volatile uint *p = &cp->cp_brgc1;
#elif defined(CONFIG_8260)
volatile uint *p = &immap->im_brgc1;
#endif
int i = 1;
while (i <= 4)
prbrg (i++, *p++);
#if defined(CONFIG_8260)
p = &immap->im_brgc5;
while (i <= 8)
prbrg (i++, *p++);
#endif
return 0;
}
int
do_i2cinfo (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR;
#if defined(CONFIG_8xx)
volatile i2c8xx_t *i2c = &immap->im_i2c;
volatile cpm8xx_t *cp = &immap->im_cpm;
volatile iic_t *iip = (iic_t *) & cp->cp_dparam[PROFF_IIC];
#elif defined(CONFIG_8260)
volatile i2c8260_t *i2c = &immap->im_i2c;
volatile iic_t *iip;
uint dpaddr;
dpaddr = *((unsigned short *) (&immap->im_dprambase[PROFF_I2C_BASE]));
if (dpaddr == 0)
iip = NULL;
else
iip = (iic_t *) & immap->im_dprambase[dpaddr];
#endif
printf ("I2MOD = %02x I2ADD = %02x\n", i2c->i2c_i2mod, i2c->i2c_i2add);
printf ("I2BRG = %02x I2COM = %02x\n", i2c->i2c_i2brg, i2c->i2c_i2com);
printf ("I2CER = %02x I2CMR = %02x\n", i2c->i2c_i2cer, i2c->i2c_i2cmr);
if (iip == NULL)
puts ("i2c parameter ram not allocated\n");
else {
printf ("RBASE = %08x TBASE = %08x\n",
iip->iic_rbase, iip->iic_tbase);
printf ("RFCR = %02x TFCR = %02x\n",
iip->iic_rfcr, iip->iic_tfcr);
printf ("MRBLR = %04x\n", iip->iic_mrblr);
printf ("RSTATE= %08x RDP = %08x\n",
iip->iic_rstate, iip->iic_rdp);
printf ("RBPTR = %04x RBC = %04x\n",
iip->iic_rbptr, iip->iic_rbc);
printf ("RXTMP = %08x\n", iip->iic_rxtmp);
printf ("TSTATE= %08x TDP = %08x\n",
iip->iic_tstate, iip->iic_tdp);
printf ("TBPTR = %04x TBC = %04x\n",
iip->iic_tbptr, iip->iic_tbc);
printf ("TXTMP = %08x\n", iip->iic_txtmp);
}
return 0;
}
int
do_sccinfo (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
unimplemented (cmdtp, flag, argc, argv);
return 0;
}
int
do_smcinfo (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
unimplemented (cmdtp, flag, argc, argv);
return 0;
}
int
do_spiinfo (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
unimplemented (cmdtp, flag, argc, argv);
return 0;
}
int
do_muxinfo (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
unimplemented (cmdtp, flag, argc, argv);
return 0;
}
int
do_siinfo (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
unimplemented (cmdtp, flag, argc, argv);
return 0;
}
int
do_mccinfo (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
unimplemented (cmdtp, flag, argc, argv);
return 0;
}
/***************************************************/
U_BOOT_CMD(
siuinfo, 1, 1, do_siuinfo,
"print System Interface Unit (SIU) registers",
""
);
U_BOOT_CMD(
memcinfo, 1, 1, do_memcinfo,
"print Memory Controller registers",
""
);
U_BOOT_CMD(
sitinfo, 1, 1, do_sitinfo,
"print System Integration Timers (SIT) registers",
""
);
#ifdef CONFIG_8260
U_BOOT_CMD(
icinfo, 1, 1, do_icinfo,
"print Interrupt Controller registers",
""
);
#endif
U_BOOT_CMD(
carinfo, 1, 1, do_carinfo,
"print Clocks and Reset registers",
""
);
U_BOOT_CMD(
iopinfo, 1, 1, do_iopinfo,
"print I/O Port registers",
""
);
U_BOOT_CMD(
iopset, 5, 0, do_iopset,
"set I/O Port registers",
"PORT PIN CMD VALUE\nPORT: A-D, PIN: 0-31, CMD: [dat|dir|odr|sor], VALUE: 0|1"
);
U_BOOT_CMD(
dmainfo, 1, 1, do_dmainfo,
"print SDMA/IDMA registers",
""
);
U_BOOT_CMD(
fccinfo, 1, 1, do_fccinfo,
"print FCC registers",
""
);
U_BOOT_CMD(
brginfo, 1, 1, do_brginfo,
"print Baud Rate Generator (BRG) registers",
""
);
U_BOOT_CMD(
i2cinfo, 1, 1, do_i2cinfo,
"print I2C registers",
""
);
U_BOOT_CMD(
sccinfo, 1, 1, do_sccinfo,
"print SCC registers",
""
);
U_BOOT_CMD(
smcinfo, 1, 1, do_smcinfo,
"print SMC registers",
""
);
U_BOOT_CMD(
spiinfo, 1, 1, do_spiinfo,
"print Serial Peripheral Interface (SPI) registers",
""
);
U_BOOT_CMD(
muxinfo, 1, 1, do_muxinfo,
"print CPM Multiplexing registers",
""
);
U_BOOT_CMD(
siinfo, 1, 1, do_siinfo,
"print Serial Interface (SI) registers",
""
);
U_BOOT_CMD(
mccinfo, 1, 1, do_mccinfo,
"print MCC registers",
""
);
#endif
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