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20 lines
681 B
NASM
20 lines
681 B
NASM
; ret_test.asm -- smallest payload that proves `jump` is a real call.
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;
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; It writes two marker words and returns with `rets`. If the rdebug `jump`
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; stub really used `call`, control comes back to the dispatcher and the TCP
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; session stays usable; if it used a plain jump, there is no return address and
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; this would fault or wander.
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;
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; Linked at bit 01840000h (byte 00308000h) by dwt/visual/build.sh.
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.text
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_start:
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setf 16, 0, 0 ; field 0 = 16 bits, zero-extended
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setf 32, 0, 1 ; field 1 = 32 bits, zero-extended
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movi 0C0DEh, a0, L
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move a0, @01850000h, 0 ; MARK1 = C0DE
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movi 0B007h, a0, L
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move a0, @01850010h, 0 ; MARK2 = B007 (proves the second store ran)
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rets
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.end
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