megadrive_test1
annotate src/intr.s @ 3:54739a11be66
- .data copy and .bss clearing
- also made sure .data and .bss start and end markers are dword-aligned to make
sure I can copy 4bytes at a time
| author | John Tsiombikas <nuclear@member.fsf.org> |
|---|---|
| date | Tue, 31 Jan 2017 07:11:17 +0200 |
| parents | |
| children |
| rev | line source |
|---|---|
| nuclear@0 | 1 | the following will go into the .vect section which will be placed at the very |
| nuclear@0 | 2 | begining of the binary at address 0 by the linker (see lnkscript). |
| nuclear@0 | 3 .section .vect,"a" |
| nuclear@0 | 4 .extern start |
| nuclear@0 | 5 | exception vectors |
| nuclear@0 | 6 .long _stacktop | 00 reset - initial SSP |
| nuclear@0 | 7 .long start | 01 reset - initial PC |
| nuclear@0 | 8 .long intr_fatal | 02 bus error |
| nuclear@0 | 9 .long intr_fatal | 03 address error |
| nuclear@0 | 10 .long intr_fatal | 04 illegal instruction |
| nuclear@0 | 11 .long intr_fatal | 05 zero divide |
| nuclear@0 | 12 .long intr_fatal | 06 chk instruction |
| nuclear@0 | 13 .long intr_fatal | 07 trapv instruction |
| nuclear@0 | 14 .long intr_fatal | 08 privilege violation |
| nuclear@0 | 15 .long intr_fatal | 09 trace |
| nuclear@0 | 16 .long intr_fatal | 0a line 1010 emulator |
| nuclear@0 | 17 .long intr_fatal | 0b line 1111 emulator |
| nuclear@0 | 18 .long intr_fatal | 0c reserved |
| nuclear@0 | 19 .long intr_fatal | 0d reserved |
| nuclear@0 | 20 .long intr_fatal | 0e format error (mc68010 only) |
| nuclear@0 | 21 .long intr_fatal | 0f uninitialized interrupt vector |
| nuclear@0 | 22 .long intr_fatal | 10 \ |
| nuclear@0 | 23 .long intr_fatal | 11 | |
| nuclear@0 | 24 .long intr_fatal | 12 | |
| nuclear@0 | 25 .long intr_fatal | 13 > reserved |
| nuclear@0 | 26 .long intr_fatal | 14 | |
| nuclear@0 | 27 .long intr_fatal | 15 | |
| nuclear@0 | 28 .long intr_fatal | 16 | |
| nuclear@0 | 29 .long intr_fatal | 17 / |
| nuclear@0 | 30 .long intr_fatal | 18 spurious interrupt |
| nuclear@0 | 31 .long intr_fatal | 19 level 1 interrupt |
| nuclear@0 | 32 .long intr_fatal | 1a level 2 interrupt |
| nuclear@0 | 33 .long intr_fatal | 1b level 3 interrupt |
| nuclear@0 | 34 .long intr_hblank | 1c level 4 interrupt (hblank in the mega drive) |
| nuclear@0 | 35 .long intr_fatal | 1d level 5 interrupt |
| nuclear@0 | 36 .long intr_vblank | 1e level 6 interrupt (vblank in the mega drive) |
| nuclear@0 | 37 .long intr_fatal | 1f level 7 interrupt |
| nuclear@0 | 38 .long intr_fatal | 20 trap 0 |
| nuclear@0 | 39 .long intr_fatal | 21 trap 1 |
| nuclear@0 | 40 .long intr_fatal | 22 trap 2 |
| nuclear@0 | 41 .long intr_fatal | 23 trap 3 |
| nuclear@0 | 42 .long intr_fatal | 24 trap 4 |
| nuclear@0 | 43 .long intr_fatal | 25 trap 5 |
| nuclear@0 | 44 .long intr_fatal | 26 trap 6 |
| nuclear@0 | 45 .long intr_fatal | 27 trap 7 |
| nuclear@0 | 46 .long intr_fatal | 28 trap 8 |
| nuclear@0 | 47 .long intr_fatal | 29 trap 9 |
| nuclear@0 | 48 .long intr_fatal | 2a trap a |
| nuclear@0 | 49 .long intr_fatal | 2b trap b |
| nuclear@0 | 50 .long intr_fatal | 2c trap c |
| nuclear@0 | 51 .long intr_fatal | 2d trap d |
| nuclear@0 | 52 .long intr_fatal | 2e trap e |
| nuclear@0 | 53 .long intr_fatal | 2f trap f |
| nuclear@0 | 54 .long intr_fatal | 30 \ |
| nuclear@0 | 55 .long intr_fatal | 31 | |
| nuclear@0 | 56 .long intr_fatal | 32 | |
| nuclear@0 | 57 .long intr_fatal | 33 | |
| nuclear@0 | 58 .long intr_fatal | 34 | |
| nuclear@0 | 59 .long intr_fatal | 35 | |
| nuclear@0 | 60 .long intr_fatal | 36 | |
| nuclear@0 | 61 .long intr_fatal | 37 | |
| nuclear@0 | 62 .long intr_fatal | 38 > reserved |
| nuclear@0 | 63 .long intr_fatal | 39 | |
| nuclear@0 | 64 .long intr_fatal | 3a | |
| nuclear@0 | 65 .long intr_fatal | 3b | |
| nuclear@0 | 66 .long intr_fatal | 3c | |
| nuclear@0 | 67 .long intr_fatal | 3d | |
| nuclear@0 | 68 .long intr_fatal | 3e | |
| nuclear@0 | 69 .long intr_fatal | 3f / |
| nuclear@0 | 70 |
| nuclear@0 | 71 | from here on we continue in the regular .text section since we don't care |
| nuclear@0 | 72 | where this code ends up. |
| nuclear@0 | 73 .text |
| nuclear@0 | 74 | interrupt handlers |
| nuclear@0 | 75 intr_fatal: |
| nuclear@0 | 76 stop #0x2700 |
| nuclear@0 | 77 |
| nuclear@0 | 78 | TODO hblank/vblank code |
| nuclear@0 | 79 intr_hblank: |
| nuclear@0 | 80 rte |
| nuclear@0 | 81 intr_vblank: |
| nuclear@0 | 82 rte |