Homework Answers
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
#include <ctype.h>
#include <sys/types.h>
#include <sys/mman.h>
#include <inttypes.h>
#define printerr(fmt,...) do { fprintf(stderr, fmt, ## __VA_ARGS__); fflush(stderr); } while(0)
#define VER_STR "devmem version T/C (http://git.io/vZ5iD) rev.0.3e"
int f_dbg = 0;
static void usage(const char *cmd)
{
fprintf(stderr, "\nUsage:\t%s [-switches] address [ type [ data ]
]\n"
"\taddress : memory address to act upon\n"
"\ttype : access operation type : [b]yte, [h]alfword,
[w]ord\n"
"\tdata : data to be written\n\n"
"Switches:\n"
"\t-r : read back after write\n"
"\t-a : do not check alignment\n"
"\t--version | -V : print version\n"
"\n",
cmd);
}
int main(int argc, char **argv)
{
int fd;
void *map_base, *virt_addr;
unsigned long read_result = -1, writeval=-1;
uint64_t target;
int access_type = 'w';
int access_size = 4;
unsigned int pagesize = (unsigned)getpagesize(); /* or
sysconf(_SC_PAGESIZE) */
unsigned int map_size = pagesize;
unsigned offset;
char *endp = NULL;
int f_readback = 0; // flag to read back after write
int f_align_check = 1; // flag to require alignment
const char *progname = argv[0];
int opt;
opterr = 0;
while ((opt = getopt(argc, argv, "+raAdV")) != -1) {
switch(opt) {
case 'r':
f_readback = 1;
break;
case 'a':
f_align_check = 0;
break;
case 'A':
// Absolute address mode. Does nothing now, for future
compat.;
break;
case 'd':
f_dbg = 1;
break;
case 'V':
printf(VER_STR "\n");
exit(0);
default:
if ( (!argv[optind]) || 0 == strcmp(argv[optind], "--help"))
{
usage(progname);
exit(1);
}
if (0 == strncmp(argv[optind], "--vers", 6)) {
printf(VER_STR "\n");
exit(0);
}
printerr("Unknown long option: %s\n", argv[optind]);
exit(2);
}
}
argc -= optind - 1;
argv += optind - 1;
if (argc < 2 || argc > 4) {
usage(progname);
exit(1);
}
if (argc > 2) {
if (!isdigit(argv[1][0])) {
// Allow access_type be 1st arg, then swap 1st and 2nd
char *t = argv[2];
argv[2] = argv[1];
argv[1] = t;
}
access_type = tolower(argv[2][0]);
if (argv[2][1] )
access_type = '?';
}
errno = 0;
target = strtoull(argv[1], &endp, 0);
if (errno != 0 || (endp && 0 != *endp)) {
printerr("Invalid memory address: %s\n", argv[1]);
exit(2);
}
switch (access_type) {
case 'b':
access_size = 1;
break;
case 'w':
access_size = 4;
break;
case 'h':
access_size = 2;
break;
default:
printerr("Illegal data type: %s\n", argv[2]);
exit(2);
}
if ((target + access_size -1) < target) {
printerr("ERROR: rolling over end of memory\n");
exit(2);
}
if ( (sizeof(off_t) < sizeof(int64_t)) && (target
> UINT32_MAX) ) {
printerr("The address %s > 32 bits. Try to rebuild in 64-bit
mode.\n", argv[1]);
// Consider mmap2() instead of this check
exit(2);
}
offset = (unsigned int)(target & (pagesize-1));
if (offset + access_size > pagesize ) {
// Access straddles page boundary: add another page:
map_size += pagesize;
}
if (f_dbg) {
printerr("Address: %#" PRIX64 " op.size=%d\n", target,
access_size);
}
if (f_align_check && offset & (access_size - 1))
{
printerr("ERROR: address not aligned on %d!\n", access_size);
exit(2);
}
fd = open("/dev/mem", O_RDWR | O_SYNC);
if (fd == -1) {
printerr("Error opening /dev/mem (%d) : %s\n", errno,
strerror(errno));
exit(1);
}
//printf("/dev/mem opened.\n");
//fflush(stdout);
map_base = mmap(0, map_size, PROT_READ | PROT_WRITE,
MAP_SHARED,
fd,
target & ~((typeof(target))pagesize-1));
if (map_base == (void *) -1) {
printerr("Error mapping (%d) : %s\n", errno,
strerror(errno));
exit(1);
}
//printf("Memory mapped at address %p.\n", map_base);
//fflush(stdout);
virt_addr = map_base + offset;
if (argc > 3) {
errno = 0;
writeval = strtoul(argv[3], &endp, 0);
if (errno || (endp && 0 != *endp)) {
printerr("Invalid data value: %s\n", argv[3]);
exit(2);
}
if (access_size < sizeof(writeval) && 0 != (writeval
>> (access_size * 8))) {
printerr("ERROR: Data value %s does not fit in %d byte(s)\n",
argv[3], access_size);
exit(2);
}
switch (access_size) {
case 1:
*((volatile uint8_t *) virt_addr) = writeval;
break;
case 2:
*((volatile uint16_t *) virt_addr) = writeval;
break;
case 4:
*((volatile uint32_t *) virt_addr) = writeval;
break;
}
if (f_dbg) {
printerr("Address: %#" PRIX64 " Written: %#lX\n", target,
writeval);
fflush(stdout);
}
}
if (argc <= 3 || f_readback) {
switch (access_size) {
case 1:
read_result = *((volatile uint8_t *) virt_addr);
break;
case 2:
read_result = *((volatile uint16_t *) virt_addr);
break;
case 4:
read_result = *((volatile uint32_t *) virt_addr);
break;
}
//printf("Value at address 0x%lld (%p): 0x%lu\n", (long
long)target, virt_addr, read_result);
//fflush(stdout);
if (f_readback && argc > 3)
printf("Written 0x%lx; readback 0x%lx\n", writeval,
read_result);
else
printf("%08lX\n", read_result);
fflush(stdout);
}
if (munmap(map_base, map_size) != 0) {
printerr("ERROR munmap (%d) %s\n", errno, strerror(errno));
}
close(fd);
return 0;
}
Add Answer to:
devmem2.c
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <signal.h>
#include <fcntl.h>
#include...
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#include <stdlib.h> #include <stdio.h> #include "main.h" #define MAX_NUM_LENGTH 11 void usage(int argc, char** argv) { if(argc...
#include <stdlib.h> #include <stdio.h> #include "main.h" #define MAX_NUM_LENGTH 11 void usage(int argc, char** argv) { if(argc < 4) { fprintf(stderr, "usage: %s <input file 1> <input file 2> <output file>\n", argv[0]); exit(EXIT_FAILURE); } } /* This function takes in the two input file names (stored in argv) and determines the number of integers in each file. If the two files both have N integers, return N, otherwise return -1. If one or both of the files do not exist, it...
GIVEN CODE- FILL IN THE BLANK! #include <fcntl.h> #include <unistd.h> #include <stdio.h> #include <stdlib.h> #include <string.h>...
GIVEN CODE- FILL IN THE
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#include <fcntl.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/wait.h>
// Function ptototypes
int readX();
void writeX(int);
int main() /// chi read x ---> divi ---> write x into file
---> par read x --> sub--> write x into file---> chi
read x-->etc
{
int pid;
// pid: used to keep track of the child
process
int x = 19530; // x:
our value as integer
...
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GIVEN CODE- FILL IN THE
BLANK!
#include <fcntl.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/wait.h>
// Function ptototypes
int readX();
void writeX(int);
int main() /// chi read x ---> divi ---> write x into file
---> par read x --> sub--> write x into file---> chi
read x-->etc
{
int pid;
// pid: used to keep track of the child
process
int x = 19530; // x:
our value as integer
...
include «stdio.h void displaymenu(void) printf(" printf" Enter Choicen") printf Set (a), Clear (c), Toggle (t)\n"): printf(" void printbinaryfunsigned char x) int main (int argc, char argvl) r mask atoi(argv[1): unsigned char maskatoi(argv[11): ensigned ahao data - ateilargvl21): char operation if argc 3 printf(" printf" n" printf("usage: %s FristArg SecondArgin", argle)); return;
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