source: buchla-68k/orig/IOLIB/RTRAPS.S@ c79db87

Last change on this file since c79db87 was 3ae31e9, checked in by Thomas Lopatic <thomas@…>, 8 years ago

Imported original source code.
  • Property mode set to 100755
File size: 1.5 KB
Line 
1* ------------------------------------------------------------------------------
2* rtraps.s -- define ROMP debug trap
3* Version 7 -- 1988-01-12 -- Copyright 1987, 1988 by D.N. Lynx Crowe
4* ------------------------------------------------------------------------------
5 .text
6*
7 .xdef _trap15
8*
9 .xref _rompbp
10*
11 .xref tr1sav,tr13sav,tr14sav
12 .xref tr1rmp,tr13rmp,tr14rmp
13*
14BUCHLA .equ 1 * IPL value: 0 = NASA , 1 = Buchla
15*
16 .ifeq BUCHLA
17IPLEVEL .equ $0400 * NASA IPL = 4 (enable 5 and above)
18 .endc
19*
20 .ifne BUCHLA
21IPLEVEL .equ $0200 * Buchla IPL = 2 (enable 3 and above)
22 .endc
23*
24IPL7 .equ $0700 * IPL 7
25*
26* _trap15 -- ROMP debug trap (used to implement breakpoints)
27* ------- ------------------------------------------------
28_trap15: ori.w #IPL7,sr * Disable interrupts
29 move.w #0,-(a7) * Keep stack long aligned
30 movem.l d0-d7/a0-a7,-(a7) * Save regs on stack
31 move.l tr1sav,tr1rmp * Save trap save areas
32 move.l tr13sav,tr13rmp * ...
33 move.l tr14sav,tr14rmp * ...
34 move.w sr,d0 * Get status register
35 andi.w #$F8FF,d0 * Enable serial I/O interrupts
36 ori.w #IPLEVEL,d0 * ...
37 move.w d0,sr * ...
38 jsr _rompbp * Pass control to ROMP
39*
40 ori.w #IPL7,sr * Disable interrupts
41 move.l tr14rmp,tr14sav * Restore trap save areas
42 move.l tr13rmp,tr13sav * ...
43 move.l tr1rmp,tr1sav * ...
44 movem.l (a7)+,d0-d7/a0-a7 * Restore regs
45 addq.l #2,a7 * Discard alignment filler word
46 rte * Back to what we interrupted
47*
48 .end
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