29 lines
1.1 KiB
Python
29 lines
1.1 KiB
Python
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# Headless post-script: find instructions that write the GP register and
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# report candidate GP base values. Once GP is known, set it as register
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# context and re-run analysis so GP-relative data references resolve.
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# Run via pyghidra ghidra_launch ... -postScript FindGPInit.py
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#@category Analysis
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listing = currentProgram.getListing()
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reg = currentProgram.getLanguage().getRegisters()
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gp_regs = [r for r in reg if r.getName().lower() in ('gp', 'r26', 'r11')]
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print('GP candidates: %s' % [r.getName() for r in gp_regs])
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it = listing.getInstructions(True)
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hits = 0
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while it.hasNext() and hits < 80:
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ins = it.next()
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n = ins.getNumOperands()
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for i in range(n):
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try:
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ops = ins.getOpObjects(i)
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except Exception: # noqa: BLE001
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continue
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for o in ops:
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if hasattr(o, 'getName') and o in gp_regs:
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# operand 0 = destination on NDS32 ALU forms
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if i == 0:
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print('%s %s' % (ins.getAddress(), ins))
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hits += 1
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print('total gp-writes shown: %d' % hits)
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