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PLT is never changed
linker knows offset between GOT and PLT
PLT code uses "load from %rip-relative address" instructions to get values from GOT
initial call to a PLT entry gets another address in the PLT, which calls dynamic linker
dynamic linker just updates the GOT entry used by the function's PLT entry
i386 is similar, but no %eip-relative addressing
caller of PLT has to set %ebx to point to GOT
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