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Foundations of Linux ARM64: Debug, Disassemble, and Reverse

Instruction Pointer

Learn about instruction pointers in the pc register and how to program data work.

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Working of pc registers

Consider these two execution steps. The pc is pointed at 0x00000000004000dc and see how it works below:

C++
0x00000000004000dc in _start ()
1: x/i $pc
=> 0x4000dc <_start+44>:        ldr     w3, [x1]
2: /x $x0 = 0x4100f0
3: /x $x1 = 0x4100f4
4: /x $x2 = 0x1
5: /x $x3 = 0x0
6: /x (int)a = 0x1
7: /x (int)b = 0x1
8: /x (long)pa = 0x4100f0
9: /x (long)pb = 0x4100f4

The kernel is running on ldr w3, [x1]. The value 1 is assigned ...