Stack Scan

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

void *stack_start;

// Fix: also needs to scan registers
void __attribute__((noinline)) foo(int *a) {
    void *stack_curr = &(size_t){0x87654321};
    while(stack_curr < stack_start) {
        int *v = *(int **)stack_curr;
        printf("0x%.16zX", v);
        if(v == a) {
            printf(" <-- %i", *v);
        }
        printf("\n");
        stack_curr += sizeof(size_t);
    }
}

void bar() {
    int *a = malloc(4);
    *a = 56;
    printf("0x%.16zX <--\n", a);
    foo(a);
}

int main(void) {
    stack_start = &(size_t){0x12345678};
    bar();
    return 0;
}