As we all know, under the ARM architecture, function parameters are passed through registers r0~r4; but if there are more than four parameters, the stack must be used.
The following is an example.
The assembly of main() is as follows:
At this time (execution to the position pointed by the arrow), the state of the stack is as follows:
The assembly of function func is as follows:
At this point, the stack status is as follows:
ldr r3, [r11, #4]
The above assembly code retrieves the value of the fifth parameter saved from the stack.
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