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Rev 2071 Rev 3222
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	# set stack
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	# set stack
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	mr sp, r4
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	mr sp, r4
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	# %r3 is defined to hold pcb_ptr - set it to 0
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	xor r3, r3, r3
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	# jump to userspace
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	# jump to userspace
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	rfi
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	rfi
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iret:
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iret: