fix wrong base calculation when running no pie target.

[d0now]

related issue: https://github.com/googleprojectzero/TinyInst/issues/68

test.c

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

void routine(void)
{
    if (rand() % 2) {
        puts("even");
    } else {
        puts("odd");
    }

    if (rand() % 2) {
        puts("even");
    } else {
        puts("odd");
    }

    for (int i = 0; i < 10; i++)
    {
        int n = rand() % 3;
        if (n == 0) {
            puts("zero");
        } else if (n == 1) {
            puts("one");
        } else {
            puts("two");
        }
    }
}

int main(int argc, const char **argv, const char **envp)
{
    srand(time(0));
    printf("run> ");
    getchar();
    routine();
    return 0;
}

output

$ gcc -o test test.c -m32
$ sudo ~/TinyInst/src.forked/build/litecov -patch_return_addresses -pid $(pidof test)
Process finished normally

[google-cla[bot]]

Thanks for your pull request! It looks like this may be your first contribution to a Google open source project. Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

View this failed invocation of the CLA check for more information.

For the most up to date status, view the checks section at the bottom of the pull request.