RTEMS4.11 / newlib / gcc issue on Sparc / LEON3

[Joel Sherrill]

Can you turn on stack checking?

it is either a stray write, a stack overflow, or something
writing past the end of a buffer. Given that is appears
to be a local variable which should be a register in
a SPARC register window, I lean to stack overflow.

Especially since you passed 0 to rtems_shell_init for
task_stacksize. That gives it a minimum stack size.
Try a large number like 256 * 1024 and see if the
problem goes away.

Stack checking also allows you to use the stackuse command
which will help you trim it back down.
On 10/14/2014 10:07 AM, Hoefle Marco wrote:
> Hello again,
> I had this memory aligned failure and I thought it is fixed with the new
> newlib version.
> We have now a new strange phenomena: A local variable is overwritten in
> a thread when the command "ls" is executed in the rtems shell:
>
>
> Starting 1 threads...
> started thread 0: id: 0x0b010002, prio: 10
>  =========================
>  starting shell
>  =========================
>
> RTEMS SHELL (Ver.1.0-FRC):/dev/console. Oct 14 2014. 'help' to list
> commands.
> [/] # hello dude, this is tick nr: 1
> hello dude, this is tick nr: 2
> hello dude, this is tick nr: 3
> hello dude, this is tick nr: 4
> hello dude, this is tick nr: 5
> hello dude, this is tick nr: 6
>
> [/] # 
> [/] # 
> [/] # ls
> dev
> hello dude, this is tick nr: 0
> hello dude, this is tick nr: 1
> hello dude, this is tick nr: 2
> hello dude, this is tick nr: 3
>
> [/] # ls
> dev
> hello dude, this is tick nr: 0
>
> [/] # 
> hello dude, this is tick nr: 1
> hello dude, this is tick nr: 2
> hello dude, this is tick nr: 3
> hello dude, this is tick nr: 4
> hello dude, this is tick nr: 5
> hello dude, this is tick nr: 6
> hello dude, this is tick nr: 7
>
>
> This will be the simple rtems4.11 test app:
>
>
> #include <bsp.h>
> #include <errno.h>
> #include <fcntl.h>
> #include <stdlib.h>
> #include <stdio.h>
> #include <unistd.h>
> #include <pthread.h>
> #include <sched.h>
> #include <rtems/shell.h>
> #include <errno.h>
>
> #include "rtems_config.h"
>
>
> void *tsk_core(void *unused);
> void *tsk_dummy(void *unused);
>
>
> struct {
> 	int prio;
> 	void *(*func)(void *arg);
> 	pthread_t id;
> }static threads[] = {
> 		{ .prio = 10, .func = tsk_core },
> //		{ .prio = 3, .func = tsk_shell }, /* minimum prio */
> //		{ .prio = 10, .func =tsk_spw0 },
> //		{ .prio = 10, .func = tsk_spw1 },
> //		{ .prio = 2, .func = tsk_script },
> //		{ .prio = 3, .func = tsk_shell }, /* minimum prio */
> //		{ .prio = 3, .func = tsk_dummy }, /* minimum prio */
> };
>
> static uint8_t nr_threads = sizeof(threads) / sizeof(threads[0]);
>
>
> void start_shell(void)
> {
> 	rtems_status_code sc = RTEMS_SUCCESSFUL;
> 	printf(" =========================\n\r");
> 	printf(" starting shell\n\r");
> 	printf(" =========================\n\r");
>
>
> 	sc = rtems_shell_init(
> 		"SHLL", /* task name */
> 		0, /* task stack size */
> 		100, /* task priority */
> 		"/dev/console", /* device name */
> 		true, /* run forever */
> 		true, /* wait for shell to terminate */
> 		NULL /* login check function,
> 		use NULL to disable a login check */
> 	);
>
> 	printf("sc: %d, errno: %s\n\r", sc, strerror(errno));
> }
>
>
> void hello_dude(int ticks)
> {
> 	printf("hello dude, this is tick nr: %d\n\r", ticks);
> }
>
>
> void *tsk_core(void *unsued)
> {
> 	int ticks = 1;
> 	while (1) {
> 		sleep(10);
> 		hello_dude(ticks++);
> 	}
>
> 	return NULL;
> }
>
> static int initUart( const char *devname)
> {
>     int fd = open( devname, O_RDWR);
>     if (fd < 0) {
>         return -errno;
>     }
>
>     struct termios settings;
>     tcgetattr( fd, &settings);
>     settings.c_iflag &= ~(IGNBRK | BRKINT | PARMRK | ISTRIP
>                     | INLCR | IGNCR | ICRNL | IXON);
>     settings.c_oflag &= ~OPOST;
>     settings.c_lflag &= ~(ECHO | ECHONL | ICANON | ISIG | IEXTEN);
>     settings.c_cflag &= ~(CSIZE | PARENB);
>     settings.c_cflag |= CS8;
>     settings.c_cc[VMIN]  = 1;
>     settings.c_cc[VTIME] = 0;
>
>     if(cfsetispeed(&settings, B115200) < 0 || cfsetospeed(&settings,
> B115200) < 0) {
>         return -1;
>     }
>
>     int err = tcsetattr( fd, TCSADRAIN, &settings);
>     if (err) return -err;
>
>     return fd;
> }
>
> void *POSIX_Init(void *argument)
> {
> 	pthread_attr_t attr;
> 	struct sched_param schedparam;
> 	int retVal;
>
>
> 	initUart("/dev/console");
>
> 	retVal = pthread_attr_init(&attr);
> 	retVal |= pthread_attr_getschedparam(&attr, &schedparam);
> 	retVal |= pthread_attr_setinheritsched(&attr,
> PTHREAD_EXPLICIT_SCHED);
> 	retVal |= pthread_attr_setschedpolicy(&attr, SCHED_RR);
> 	if (retVal) {
> 		printf("thread setup failed!\n\r");
> 	}
>
> 	if(retVal == 0) {
> 		/* starting threads */
> 		printf( "Starting %d threads...\n\r", nr_threads);
>
> 		for (uint8_t i = 0; i < nr_threads; i++) {
> 			schedparam.sched_priority = threads[i].prio;
> 			retVal |= pthread_attr_setschedparam(&attr,
> &schedparam);
> 			retVal |= pthread_create(&threads[i].id, &attr,
> threads[i].func, NULL);
>
> 			if (retVal)
> 			{
> 				printf("thread creation failed!\n\r");
>
> 				// cancel loop
> 				i = nr_threads;
> 			}
> 			printf( "started thread %d: id: 0x%08x, prio:
> %d\n\r", i, threads[i].id, threads[i].prio);
> 		}
> 	}
>
> 	start_shell();
>
> 	return NULL;
> }
>
> I'll be happy to provide the c files, retms config and Makefile as an
> email attachment if somebody is interested.
>
> Marco
>
>
>
>

-- 
Joel Sherrill, Ph.D.             Director of Research & Development
joel.sherrill at OARcorp.com        On-Line Applications Research
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