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I'm debugging android JNI with gdb without source code. I use ni command to step over arm asm instructions. I suppose ni is step over, but it still goes into function like BL xxxx, and I have to use finish to get back.

I tried ni and si, seems no difference, why?

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You don't have the source code, so I assume you don't have any debug information with your binary either. This is just a guess, but without them, I suppose your BL is seen as a mere branch, not a subroutine call. For further explanation, see this comment.

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