First steps with amd64 assembly

Question

I try to learn amd64 assembler. This is the first thing I tried. This piece of assembly should replicate the functionality of the following piece of C code, which turns a binary sha-256 hash into a human readable form.

assembly code

1:  .ascii "0123456789abcdef"
    .global show_hash
show_hash:
    .type show_hash @function
    .func show_hash
    mov $32,%ecx
    .p2align 2
0:  xor %eax,%eax
    lodsb
    mov %eax,%edx
    shr $4,%al
    and $15,%dl
    mov 1b(%rax),%al
    mov 1b(%rdx),%dl
    mov %bl,%ah
    stosw
    dec %ecx
    jnz 0b
    mov %cl,(%rdi)
    ret
    .endfunc

C code

void show_hash(char *dst, unsigned char *src) {
  static const char *lookup = "0123456789abcdef";
  char lo, hi, byte;
  int i = 32;

  do {
    byte = *src++;
    hi = lookup[byte >> 4];
    lo = lookup[byte & 0xf];
    *dst++ = hi;
    *dst++ = lo;
  } while (i--);
}

Am I doing it right? I tried to move the lookup table (label 1) into .section rodata, but all references to it were changed to 0 in the linked program, so I put it into the text section for now.