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75 lines
2.9 KiB
Plaintext
75 lines
2.9 KiB
Plaintext
GSP COFF Assembler, Version 2.00, 87.300 Sun Oct 18 03:03:04 2026
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(c) Copyright 1985, 1987, Texas Instruments Inc.
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PAGE 1
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0001 ; retprobe.asm -- MINIMAL test of the DI return-PC tram
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0002 ;
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0003 ; Installs `entry` on the DI RAM stub (00000DB0h). `en
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0004 ; interrupt frame's saved PC with `ret_hook` and runs t
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0005 ; `ret_hook` bumps a marker and returns to the saved PC
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0006 ; NOT preserve registers, so TCP liveness tells us whet
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0007 ; itself is sound. Scratch is in the payload's own pag
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0008 ;
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0009 ; Linked at bit 01840000h by dwt/visual/build.sh.
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0010
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0011 00000000 .text
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0012 00000000 _start:
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0013 00000000 01E0 pushst
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0014 00000010 0360 dint
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0015 00000020 0540 setf 32, 0, 0
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0016 00000030 09E0 movi entry, a0, L
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00000040 00000160'
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0017 00000060 0580 move a0, @00000DC0h, 0
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00000070 00000DC0
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0018 00000090 0550 setf 16, 0, 0
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0019 000000A0 09E0 movi 0C080h, a0, L
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000000B0 0000C080
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0020 000000D0 0580 move a0, @00000DB0h, 0
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000000E0 00000DB0
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0021 00000100 4400 sub a0, a0
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0022 00000110 0580 move a0, @01840800h, 0 ; marker
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00000120 01840800
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0023 00000140 01C0 popst
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0024 00000150 0960 rets
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0025
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0026 00000160 entry:
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0027 00000160 0780 move a0, @01840810h, 1
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00000170 01840810
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0028 00000190 0740 setf 32, 0, 1
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0029 000001A0 B7E0 move *sp(020h), a0, 1
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000001B0 0020
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0030 000001C0 0780 move a0, @01840804h, 1 ; orig_pc
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000001D0 01840804
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0031 000001F0 09E0 movi ret_hook, a0, L
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00000200 000002A0'
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0032 00000220 B20F move a0, *sp(020h), 1
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00000230 0020
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0033 00000240 07A0 move @01840810h, a0, 1
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00000250 01840810
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0034 00000270 C080 jauc 3F7146D0h
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00000280 3F7146D0
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0035
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0036 000002A0 ret_hook:
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0037 000002A0 05A0 move @01840800h, a0, 0
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000002B0 01840800
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0038 000002D0 1020 inc a0
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0039 000002E0 0580 move a0, @01840800h, 0
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000002F0 01840800
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0040 00000310 0740 setf 32, 0, 1
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0041 00000320 07A0 move @01840804h, a0, 1 ; orig_pc
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00000330 01840804
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GSP COFF Assembler, Version 2.00, 87.300 Sun Oct 18 03:03:04 2026
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(c) Copyright 1985, 1987, Texas Instruments Inc.
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PAGE 2
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0042 00000350 A20F move a0, -*sp, 1
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0043 00000360 0180 getst a0 ; (clobbers a0 on purpose)
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0044 00000370 A20F move a0, -*sp, 1
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0045 00000380 01C0 popst
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0046 00000390 0960 rets
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0047 .end
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No Errors, No Warnings
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