How to access symbol and its content by assembly (and with PIE)

cmd.sh

$ as -o foo.obj foo.S
$ cc -o sample sample.c foo.obj
$ ./sample
0x557727162030 # address of value1
0x1122334455667788 # content of value1
0x55772716203c # address of z

foo.S

.text
.global foo
.global bar

foo:
  lea value1(%rip), %rax
  retq

bar:
  lea value1(%rip), %rdx
  movq (%rdx), %rax
  retq

.data

.align 16

value1:
  .quad 0x1122334455667788

sample.c

#include <stdio.h>

long foo();
long bar();

int z = 0;

int main(int argc, const char *argv[]) {
    long x = foo();
    printf("0x%lx\n", x);

    long y = bar();
    printf("0x%lx\n", y);

    printf("0x%lx\n", (long) &z);

    return 0;
}