I wrote swap on assembly, but I'm not sure that my code is right, this is the code
swap: mov r1, -(sp)
mov (sp) r1
mov 2(sp) (sp)
mov r1 2(sp)
mov (sp)+, r1
rts pc
swap receives pointer from stack
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What architecture is it? PPC? – kennytm May 23 '10 at 13:46
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no, pdp-11, I'm working from simulator – lego69 May 23 '10 at 13:51
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[Not answer related]: Can you please specify the emulator.. I am looking for one :) – Betamoo May 23 '10 at 16:35
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1Note: there are missing commas in your code.. – Betamoo May 23 '10 at 16:37
1 Answers
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is sp a stackpointer? There is usually the command ldw rA, 0(rB) (0 is the offset and rB is the address you will load from, the actual data is now in rA). ldw loads a whole word into the memory, ldb loads a byte, stw rA, 0(rB) stores a word. mov usually copies one register to another.
Joelmob
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