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Can anyone please explain what is the meaning of this code for ARM?
__asm__ __volatile__("mov %0, pc \n":"=r"(val)::"memory")
I think it stores the value of program counter in the variable val. Am I correct?
That’s right, it puts the program counter into
val.The
=rmeans that it’s an output write-only variable."memory"tells the compiler not to cache values across the inline assembly. I’m not 100% sure why"memory"has been used here though.