Illegal instruction (exception 2)

    int *exit_code = (int*) 0x820000c;
    *exit_code = 0xdeadbeef;

---
Illegal instruction (exception 2)

    asm("csrw mstatus, %0" ::"r"(0xdeadbeef));

---
Illegal instruction (exception 2)

void foo() {
    printf("hello world");
}

    asm("jr %0"::"r"(foo+2));

---
explore MISP

  (gdb) display/t $mip
  (gdb) b sys_invoke

---
linux: malloc too much memory


#include <stdlib.h>
#include <stdio.h>
#include <string.h>

#define M256 1024*1024*256

int main() {
    unsigned long long counter = 0;
    while(1) {
        void *tmp = malloc(M256);
        counter += 256;
        memset(tmp, 0, M256);
        printf("allocated %.2f GB memory\n", counter/1024.0);
    }
}