git.mutantstargoat.com Git - megadrive_tetris/blob - src/intr.s

   1 | the following will go into the .vect section which will be placed at the very
   2 | begining of the binary at address 0 by the linker (see lnkscript).
   3         .section .vect,"a"
   4         .extern start
   5 | exception vectors
   6         .long _stacktop         | 00 reset - initial SSP
   7         .long start             | 01 reset - initial PC
   8         .long intr_fatal        | 02 bus error
   9         .long intr_fatal        | 03 address error
  10         .long intr_fatal        | 04 illegal instruction
  11         .long intr_fatal        | 05 zero divide
  12         .long intr_fatal        | 06 chk instruction
  13         .long intr_fatal        | 07 trapv instruction
  14         .long intr_fatal        | 08 privilege violation
  15         .long intr_fatal        | 09 trace
  16         .long intr_fatal        | 0a line 1010 emulator
  17         .long intr_fatal        | 0b line 1111 emulator
  18         .long intr_fatal        | 0c reserved
  19         .long intr_fatal        | 0d reserved
  20         .long intr_fatal        | 0e format error (mc68010 only)
  21         .long intr_fatal        | 0f uninitialized interrupt vector
  22         .long intr_fatal        | 10 \
  23         .long intr_fatal        | 11 |
  24         .long intr_fatal        | 12 |
  25         .long intr_fatal        | 13  > reserved
  26         .long intr_fatal        | 14 |
  27         .long intr_fatal        | 15 |
  28         .long intr_fatal        | 16 |
  29         .long intr_fatal        | 17 /
  30         .long intr_fatal        | 18 spurious interrupt
  31         .long intr_fatal        | 19 level 1 interrupt
  32         .long intr_fatal        | 1a level 2 interrupt
  33         .long intr_fatal        | 1b level 3 interrupt
  34         .long intr_hblank       | 1c level 4 interrupt (hblank in the mega drive)
  35         .long intr_fatal        | 1d level 5 interrupt
  36         .long intr_vblank       | 1e level 6 interrupt (vblank in the mega drive)
  37         .long intr_fatal        | 1f level 7 interrupt
  38         .long intr_fatal        | 20 trap 0
  39         .long intr_fatal        | 21 trap 1
  40         .long intr_fatal        | 22 trap 2
  41         .long intr_fatal        | 23 trap 3
  42         .long intr_fatal        | 24 trap 4
  43         .long intr_fatal        | 25 trap 5
  44         .long intr_fatal        | 26 trap 6
  45         .long intr_fatal        | 27 trap 7
  46         .long intr_fatal        | 28 trap 8
  47         .long intr_fatal        | 29 trap 9
  48         .long intr_fatal        | 2a trap a
  49         .long intr_fatal        | 2b trap b
  50         .long intr_fatal        | 2c trap c
  51         .long intr_fatal        | 2d trap d
  52         .long intr_fatal        | 2e trap e
  53         .long intr_fatal        | 2f trap f
  54         .long intr_fatal        | 30 \
  55         .long intr_fatal        | 31 |
  56         .long intr_fatal        | 32 |
  57         .long intr_fatal        | 33 |
  58         .long intr_fatal        | 34 |
  59         .long intr_fatal        | 35 |
  60         .long intr_fatal        | 36 |
  61         .long intr_fatal        | 37 |
  62         .long intr_fatal        | 38  > reserved
  63         .long intr_fatal        | 39 |
  64         .long intr_fatal        | 3a |
  65         .long intr_fatal        | 3b |
  66         .long intr_fatal        | 3c |
  67         .long intr_fatal        | 3d |
  68         .long intr_fatal        | 3e |
  69         .long intr_fatal        | 3f /
  70
  71 | from here on we continue in the regular .text section since we don't care
  72 | where this code ends up.
  73         .text
  74 | interrupt handlers
  75 intr_fatal:
  76         stop #0x2700
  77
  78 | TODO hblank/vblank code
  79 intr_hblank:
  80         rte
  81 intr_vblank:
  82         rte