cat >demo.c <<'EOF'
int main ( void )
{
   int cost = 13, tax = 2, total;
   total = cost + tax;
   return 0;
}
EOF

objdump -C -g -d -l  -M reg-names-raw -S demo

 ...
 8048385:       c7 45 f0 0d 00 00 00    movl   $0xd,0xfffffff0(%ebp)
 804838c:       c7 45 f4 02 00 00 00    movl   $0x2,0xfffffff4(%ebp)
 8048393:       8b 45 f4                mov    0xfffffff4(%ebp),%eax
 8048396:       03 45 f0                add    0xfffffff0(%ebp),%eax
 8048399:       89 45 f8                mov    %eax,0xfffffff8(%ebp)
 ...