Why does not XORing %eax causes segfault? [duplicate]

问题

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Closed 12 days ago.

.text

having this:

str:
    .string "string"
    .globl main
main:
    xor %eax, %eax #is commented causes segfault
    leaq str(%rip), %rdi
    call printf
    xorq %rdi, %rdi
    call exit

Does printf uses %rax? or is the segfault caused by str(%rip)? As how i understand in -> leaq str(%rip) uses address at register %rip+str. But str is address, not value (like +4,8 or 16...), then what does the leaq str(%rip) gain?

Compiled as $cc foo.s.

来源：https://stackoverflow.com/questions/62196157/why-does-not-xoring-eax-causes-segfault