30.3.2020

20190329/blink-1.elf.s

-
-blink-1.elf:     file format elf32-avr
-
-
-Disassembly of section .text:
-
-00000000 <__vectors>:
-   0:	0c 94 34 00 	jmp	0x68	; 0x68 <__ctors_end>
-   4:	0c 94 3e 00 	jmp	0x7c	; 0x7c <__bad_interrupt>
-   8:	0c 94 3e 00 	jmp	0x7c	; 0x7c <__bad_interrupt>
-   c:	0c 94 3e 00 	jmp	0x7c	; 0x7c <__bad_interrupt>
-  10:	0c 94 3e 00 	jmp	0x7c	; 0x7c <__bad_interrupt>
-  14:	0c 94 3e 00 	jmp	0x7c	; 0x7c <__bad_interrupt>
-  18:	0c 94 3e 00 	jmp	0x7c	; 0x7c <__bad_interrupt>
-  1c:	0c 94 3e 00 	jmp	0x7c	; 0x7c <__bad_interrupt>
-  20:	0c 94 3e 00 	jmp	0x7c	; 0x7c <__bad_interrupt>
-  24:	0c 94 3e 00 	jmp	0x7c	; 0x7c <__bad_interrupt>
-  28:	0c 94 3e 00 	jmp	0x7c	; 0x7c <__bad_interrupt>
-  2c:	0c 94 3e 00 	jmp	0x7c	; 0x7c <__bad_interrupt>
-  30:	0c 94 3e 00 	jmp	0x7c	; 0x7c <__bad_interrupt>
-  34:	0c 94 3e 00 	jmp	0x7c	; 0x7c <__bad_interrupt>
-  38:	0c 94 3e 00 	jmp	0x7c	; 0x7c <__bad_interrupt>
-  3c:	0c 94 3e 00 	jmp	0x7c	; 0x7c <__bad_interrupt>
-  40:	0c 94 3e 00 	jmp	0x7c	; 0x7c <__bad_interrupt>
-  44:	0c 94 3e 00 	jmp	0x7c	; 0x7c <__bad_interrupt>
-  48:	0c 94 3e 00 	jmp	0x7c	; 0x7c <__bad_interrupt>
-  4c:	0c 94 3e 00 	jmp	0x7c	; 0x7c <__bad_interrupt>
-  50:	0c 94 3e 00 	jmp	0x7c	; 0x7c <__bad_interrupt>
-  54:	0c 94 3e 00 	jmp	0x7c	; 0x7c <__bad_interrupt>
-  58:	0c 94 3e 00 	jmp	0x7c	; 0x7c <__bad_interrupt>
-  5c:	0c 94 3e 00 	jmp	0x7c	; 0x7c <__bad_interrupt>
-  60:	0c 94 3e 00 	jmp	0x7c	; 0x7c <__bad_interrupt>
-  64:	0c 94 3e 00 	jmp	0x7c	; 0x7c <__bad_interrupt>
-
-00000068 <__ctors_end>:
-  68:	11 24       	eor	r1, r1
-  6a:	1f be       	out	0x3f, r1	; 63
-  6c:	cf ef       	ldi	r28, 0xFF	; 255
-  6e:	d8 e0       	ldi	r29, 0x08	; 8
-  70:	de bf       	out	0x3e, r29	; 62
-  72:	cd bf       	out	0x3d, r28	; 61
-  74:	0e 94 40 00 	call	0x80	; 0x80 <main>
-  78:	0c 94 57 00 	jmp	0xae	; 0xae <_exit>
-
-0000007c <__bad_interrupt>:
-  7c:	0c 94 00 00 	jmp	0	; 0x0 <__vectors>
-
-00000080 <main>:
-  80:	81 e0       	ldi	r24, 0x01	; 1
-  82:	8a b9       	out	0x0a, r24	; 10
-  84:	58 9a       	sbi	0x0b, 0	; 11
-  86:	2f ef       	ldi	r18, 0xFF	; 255
-  88:	89 e6       	ldi	r24, 0x69	; 105
-  8a:	98 e1       	ldi	r25, 0x18	; 24
-  8c:	21 50       	subi	r18, 0x01	; 1
-  8e:	80 40       	sbci	r24, 0x00	; 0
-  90:	90 40       	sbci	r25, 0x00	; 0
-  92:	e1 f7       	brne	.-8      	; 0x8c <main+0xc>
-  94:	00 c0       	rjmp	.+0      	; 0x96 <main+0x16>
-  96:	00 00       	nop
-  98:	58 98       	cbi	0x0b, 0	; 11
-  9a:	2f ef       	ldi	r18, 0xFF	; 255
-  9c:	89 e6       	ldi	r24, 0x69	; 105
-  9e:	98 e1       	ldi	r25, 0x18	; 24
-  a0:	21 50       	subi	r18, 0x01	; 1
-  a2:	80 40       	sbci	r24, 0x00	; 0
-  a4:	90 40       	sbci	r25, 0x00	; 0
-  a6:	e1 f7       	brne	.-8      	; 0xa0 <main+0x20>
-  a8:	00 c0       	rjmp	.+0      	; 0xaa <main+0x2a>
-  aa:	00 00       	nop
-  ac:	eb cf       	rjmp	.-42     	; 0x84 <main+0x4>
-
-000000ae <_exit>:
-  ae:	f8 94       	cli
-
-000000b0 <__stop_program>:
-  b0:	ff cf       	rjmp	.-2      	; 0xb0 <__stop_program>

20190329/bs-20190329-fig1.tex

-\documentclass{article}
-\input tmp.inputs
-\pagestyle{empty}
-\begin{document}
-      \begin{pspicture}(6,2)
-        \put(3,2){\makebox(0,0)[t]{Harte Echtzeitanforderungen}}
-        \put(3,0){\makebox(0,0)[b]{Ressourcen optimal nutzen}}
-        \psline[arrows=<->](3,0.4)(3.2,1.125)(2.8,0.875)(3,1.6)
-      \end{pspicture}
-    
-\end{document}

20190329/bs-20190329-fig2.tex

-\documentclass{article}
-\input tmp.inputs
-\pagestyle{empty}
-\begin{document}
-      \begin{pspicture}(6,2)
-        \put(3,2){\makebox(0,0)[t]{Harte Echtzeitanforderungen}}
-        \put(3,0){\makebox(0,0)[b]{Ressourcen optimal nutzen}}
-        \psline[arrows=<->](3,0.4)(3.2,1.125)(2.8,0.875)(3,1.6)
-      \end{pspicture}
-    
-\end{document}

20190329/hello-1.c

-#include <stdio.h>
-
-int main (void)
-{
-  printf ("Hello, world!\n");
-  return 0;
-}

20190329/screenshot-1.txt

-cassini/home/peter/bo/2018ss/bs/20180413> echo -n "Hallo"
-Hallocassini/home/peter/bo/2018ss/bs/20180413> ls -l /bin/echo
--rwxr-xr-x 1 root root 31464 Feb 22  2017 /bin/echo
-cassini/home/peter/bo/2018ss/bs/20180413> ls -l /bin/ls
--rwxr-xr-x 1 root root 130736 Feb 22  2017 /bin/ls
-cassini/home/peter/bo/2018ss/bs/20180413> if [ 2 == 2 ]; then echo "Jau."; else echo "Hä?"; fi
-Jau.
-cassini/home/peter/bo/2018ss/bs/20180413> if ls /bin/ls; then echo "Jau."; else echo "Hä?"; fi
-/bin/ls
-Jau.
-cassini/home/peter/bo/2018ss/bs/20180413> if ls /bin/prlxprüü; then echo "Jau."; else echo "Hä?"; fi
-ls: Zugriff auf '/bin/prlxprüü' nicht möglich: Datei oder Verzeichnis nicht gefunden
-Hä?
-cassini/home/peter/bo/2018ss/bs/20180413> ls -l /bin/[
-ls: Zugriff auf '/bin/[' nicht möglich: Datei oder Verzeichnis nicht gefunden
-cassini/home/peter/bo/2018ss/bs/20180413> ls -l /bin/}[
-ls: Zugriff auf '/bin/}[' nicht möglich: Datei oder Verzeichnis nicht gefunden
-cassini/home/peter/bo/2018ss/bs/20180413> ls -l /bin/\[
-ls: Zugriff auf '/bin/[' nicht möglich: Datei oder Verzeichnis nicht gefunden
-cassini/home/peter/bo/2018ss/bs/20180413> ls -l /usr/bin/\[
--rwxr-xr-x 1 root root 52008 Feb 22  2017 /usr/bin/[

20190329/screenshot-2.txt

-cassini/home/peter/bo/2018ss/bs/20180413> hallo="Hallo, Welt!"
-cassini/home/peter/bo/2018ss/bs/20180413> echo $hallo
-Hallo, Welt!
-cassini/home/peter/bo/2018ss/bs/20180413> unset hallo
-cassini/home/peter/bo/2018ss/bs/20180413> echo $hallo
-
-cassini/home/peter/bo/2018ss/bs/20180413> hallo="Hallo, Welt!"
-cassini/home/peter/bo/2018ss/bs/20180413> echo $Hallo
-
-cassini/home/peter/bo/2018ss/bs/20180413> hallo = bla
-bash: hallo: Kommando nicht gefunden.
-cassini/home/peter/bo/2018ss/bs/20180413> hallo= bla
-bash: bla: Kommando nicht gefunden.
-cassini/home/peter/bo/2018ss/bs/20180413> hallo=blabla
-cassini/home/peter/bo/2018ss/bs/20180413> echo $hallo
-blabla
-cassini/home/peter/bo/2018ss/bs/20180413> hallo=Hallo, Welt!
-bash: Welt!: Kommando nicht gefunden.
-cassini/home/peter/bo/2018ss/bs/20180413> if [ 2 -lt 3 ]; then echo "kleiner"; else echo "größer"; fi
-kleiner
-cassini/home/peter/bo/2018ss/bs/20180413> hallo=Hallo! echo $hallo
-blabla

20190329/screenshot-3.txt

-cassini/home/peter/bo/2018ss/bs/20180413/src/test> ls -l ..
-insgesamt 12
--rw-r--r-- 1 peter peter   82 Apr 13 14:50 hello-1.c
--rw-r--r-- 1 peter peter   82 Apr 13 14:52 hello-2.c
-drwxr-xr-x 2 peter peter 4096 Apr 13 14:50 test
-cassini/home/peter/bo/2018ss/bs/20180413/src/test> mv ../hello-*.c
-cassini/home/peter/bo/2018ss/bs/20180413/src/test> ls -l
-insgesamt 0
-cassini/home/peter/bo/2018ss/bs/20180413/src/test> ls -l ..
-insgesamt 8
--rw-r--r-- 1 peter peter   82 Apr 13 14:50 hello-2.c
-drwxr-xr-x 2 peter peter 4096 Apr 13 14:50 test

20190412/Makefile

-Makefile-2
\ No newline at end of file

20190412/Makefile-0

-TARGET = blink-1
-
-$(TARGET).elf: $(TARGET).c
-	avr-gcc -Wall -Os -c -mmcu=atmega328p $(TARGET).c -o $(TARGET).elf
-
-$(TARGET).hex: $(TARGET).elf
-	avr-objcopy -O ihex $(TARGET).elf $(TARGET).hex
-
-upload: $(TARGET).hex
-	avrdude -P /dev/ttyACM0 -c arduino -p m328p -U flash:w:$(TARGET).hex

20190412/Makefile-1

-hello-1: hello-1.c
-	gcc -Wall -O hello-1.c -o hello-1

20190412/Makefile-2

-obj-m += hellomod-1.o
-obj-m += chardev-1.o
-
-all:
-	make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules
-
-clean:
-	make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean

20190412/chardev-1.c

-/*
- *  chardev.c: Creates a read-only char device that says how many times
- *  you've read from the dev file
- */
-
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/fs.h>
-#include <asm/uaccess.h>	/* for put_user */
-
-/*  
- *  Prototypes - this would normally go in a .h file
- */
-int init_module(void);
-void cleanup_module(void);
-static int device_open(struct inode *, struct file *);
-static int device_release(struct inode *, struct file *);
-static ssize_t device_read(struct file *, char *, size_t, loff_t *);
-static ssize_t device_write(struct file *, const char *, size_t, loff_t *);
-
-#define SUCCESS 0
-#define DEVICE_NAME "chardev"	/* Dev name as it appears in /proc/devices   */
-#define BUF_LEN 80		/* Max length of the message from the device */
-
-/* 
- * Global variables are declared as static, so are global within the file. 
- */
-
-static int Major;		/* Major number assigned to our device driver */
-static int Device_Open = 0;	/* Is device open?  
-				 * Used to prevent multiple access to device */
-static char msg[BUF_LEN];	/* The msg the device will give when asked */
-static char *msg_Ptr;
-
-static struct file_operations fops = {
-	.read = device_read,
-	.write = device_write,
-	.open = device_open,
-	.release = device_release
-};
-
-/*
- * This function is called when the module is loaded
- */
-int init_module(void)
-{
-        Major = register_chrdev(0, DEVICE_NAME, &fops);
-
-	if (Major < 0) {
-	  printk(KERN_ALERT "Registering char device failed with %d\n", Major);
-	  return Major;
-	}
-
-	printk(KERN_INFO "I was assigned major number %d. To talk to\n", Major);
-	printk(KERN_INFO "the driver, create a dev file with\n");
-	printk(KERN_INFO "'mknod /dev/%s c %d 0'.\n", DEVICE_NAME, Major);
-	printk(KERN_INFO "Try various minor numbers. Try to cat and echo to\n");
-	printk(KERN_INFO "the device file.\n");
-	printk(KERN_INFO "Remove the device file and module when done.\n");
-
-	return SUCCESS;
-}
-
-/*
- * This function is called when the module is unloaded
- */
-void cleanup_module(void)
-{
-	/* 
-	 * Unregister the device 
-	 */
-	unregister_chrdev(Major, DEVICE_NAME);
-}
-
-/*
- * Methods
- */
-
-/* 
- * Called when a process tries to open the device file, like
- * "cat /dev/mycharfile"
- */
-static int device_open(struct inode *inode, struct file *file)
-{
-	static int counter = 0;
-
-	if (Device_Open)
-		return -EBUSY;
-
-	Device_Open++;
-	sprintf(msg, "I already told you %d times Hello world!\n", counter++);
-	msg_Ptr = msg;
-	try_module_get(THIS_MODULE);
-
-	return SUCCESS;
-}
-
-/* 
- * Called when a process closes the device file.
- */
-static int device_release(struct inode *inode, struct file *file)
-{
-	Device_Open--;		/* We're now ready for our next caller */
-
-	/* 
-	 * Decrement the usage count, or else once you opened the file, you'll
-	 * never get get rid of the module. 
-	 */
-	module_put(THIS_MODULE);
-
-	return 0;
-}
-
-/* 
- * Called when a process, which already opened the dev file, attempts to
- * read from it.
- */
-static ssize_t device_read(struct file *filp,	/* see include/linux/fs.h   */
-			   char *buffer,	/* buffer to fill with data */
-			   size_t length,	/* length of the buffer     */
-			   loff_t * offset)
-{
-	/*
-	 * Number of bytes actually written to the buffer 
-	 */
-	int bytes_read = 0;
-
-	/*
-	 * If we're at the end of the message, 
-	 * return 0 signifying end of file 
-	 */
-	if (*msg_Ptr == 0)
-		return 0;
-
-	/* 
-	 * Actually put the data into the buffer 
-	 */
-	while (length && *msg_Ptr) {
-
-		/* 
-		 * The buffer is in the user data segment, not the kernel 
-		 * segment so "*" assignment won't work.  We have to use 
-		 * put_user which copies data from the kernel data segment to
-		 * the user data segment. 
-		 */
-		put_user(*(msg_Ptr++), buffer++);
-
-		length--;
-		bytes_read++;
-	}
-
-	/* 
-	 * Most read functions return the number of bytes put into the buffer
-	 */
-	return bytes_read;
-}
-
-/*  
- * Called when a process writes to dev file: echo "hi" > /dev/hello 
- */
-static ssize_t
-device_write(struct file *filp, const char *buff, size_t len, loff_t * off)
-{
-	printk(KERN_ALERT "Sorry, this operation isn't supported.\n");
-	return -EINVAL;
-}