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67 lines
1.4 KiB
ArmAsm
67 lines
1.4 KiB
ArmAsm
; nf_asma.s - AHCC NatFeats ASM detection code
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;
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; Copyright (c) 2014 by Eero Tamminen
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;
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; Mostly based on code from EmuTOS,
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; Copyright (c) 2001-2013 by the EmuTOS development team
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;
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; This file is distributed under the GPL, version 2 or at your
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; option any later version. See doc/license.txt for details.
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;;
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;; exported symbols
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;;
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;; (AHCC doesn't prepend C-symbols with _)
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;;
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.global nf_id
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.global nf_call
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.global detect_nf
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;;
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;; variables
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;;
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.data
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nf_version:
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dc.b "NF_VERSION\0"
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even
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;;
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;; code
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;;
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.text
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; NatFeats test
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;
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; Needs to be called from Supervisor mode,
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; otherwise exception handler change bombs
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detect_nf:
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clr.l d0 ; assume no NatFeats available
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move.l sp, a1
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move.l 0x10, a0 ; illegal vector
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move.l #fail_nf, 0x10
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pea nf_version
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sub.l #4, sp
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; Conflict with ColdFire instruction mvs.b d0,d1
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dc.w 0x7300 ; Jump to NATFEAT_ID
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tst.l d0
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beq.s fail_nf
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moveq #1, d0 ; NatFeats detected
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fail_nf:
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move.l a1, sp
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move.l a0, 0x10 ; illegal vector
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rts
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; map native feature to its ID
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nf_id:
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dc.w 0x7300 ; Conflict with ColdFire instruction mvs.b d0,d1
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rts
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; call native feature by its ID
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nf_call:
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dc.w 0x7301 ; Conflict with ColdFire instruction mvs.b d1,d1
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rts
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