Read Memory : Android inside OMAP

The following Code is used for reading memory map in android, after cross-compilation, the exe should be pushed to the target and executed for reading any memory map registers in the system.

include stdio.h

include stdlib.h

include sys/mman.h

include fcntl.h

#define MEM_SIZE 4096

#define MEM_MASK (MEM_SIZE - 1)

#define MEMORY "/dev/mem"

void memaccess(unsigned int reg_addr, unsigned int *reg_val)

{

int fd;

void *mem_map, *mem_addr;

fd = open(MEMORY, O_RDWR|O_SYNC);

if(fd < 0) {

perror(MEMORY);

exit(1);

}

mem_map = mmap(0, MEM_SIZE, PROT_READ|PROT_WRITE, MAP_SHARED, fd, reg_addr & ~MEM_MASK);

if(mem_map == (void*) - 1) {

perror("mmap()");

exit(1);

}

mem_addr = mem_map + (reg_addr & MEM_MASK);

if (reg_val)

*(unsigned int*)mem_addr = *reg_val;

else

printf("0x%08X\n", *(unsigned int*)mem_addr);

}

int main(int argc, char *argv[])

{

unsigned int reg_addr, reg_val, *reg_val_ptr;

if (argc < 2) {

fprintf(stderr, "\nUsage:\t%s [value]\n\n\n", argv[0]);

exit(1);

}

reg_addr = strtoul(argv[1], NULL, 0);

if (argc == 3) {

reg_val = strtoul(argv[2], NULL, 0);

reg_val_ptr = &reg_val;

}

else

reg_val_ptr = NULL;

memaccess(reg_addr, reg_val_ptr);

return 0;

}