68k vector table: Difference between revisions
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|16 | |16 | ||
|000040 | |000040 | ||
|rowspan= | |rowspan=8|Reserved | ||
|rowspan=5| | |rowspan=5| | ||
|rowspan=8| | |||
|- | |- | ||
|17 | |17 | ||
| Line 174: | Line 174: | ||
|21 | |21 | ||
|000054 | |000054 | ||
| | |rowspan="3"|Normally reserved but used on the NeoGeo CD. See [[68k interrupts]]. | ||
|Normally reserved but used on the NeoGeo CD | |||
|- | |- | ||
|22 | |22 | ||
|000058 | |000058 | ||
|- | |- | ||
|23 | |23 | ||
|00005C | |00005C | ||
|- | |- | ||
|24 | |24 | ||
| Line 199: | Line 191: | ||
|000064 | |000064 | ||
|Level 1 [[68k interrupts|interrupt]] autovector | |Level 1 [[68k interrupts|interrupt]] autovector | ||
|[[68k interrupts|V-Blank]] ( | |[[68k interrupts|V-Blank]] (cart) / [[Timer interrupt]] (CD). | ||
| | | | ||
|- | |- | ||
| Line 205: | Line 197: | ||
|000068 | |000068 | ||
|Level 2 interrupt autovector | |Level 2 interrupt autovector | ||
|Timer interrupt ( | |Timer interrupt (cart) / V-Blank (CD). | ||
| | | | ||
|- | |- | ||
| Line 211: | Line 203: | ||
|00006C | |00006C | ||
|Level 3 interrupt autovector | |Level 3 interrupt autovector | ||
|Cold boot. | |Cold boot (cart). | ||
| | | | ||
|- | |- | ||
Latest revision as of 16:01, 30 July 2018
The vector table consists of a 256 bytes long vector list specific to the 68k.
Each vector is a 32-bit address, meaning the table holds 64 vectors. Each entry is used by the 68k in precise cases.
All bootable 68k programs must have a vector table at their very beginning. The system ROM and games have their own.
Is $C00426 an universal BIOS call for a complete reset ?
Stack frames
Format A
| Offset from SP | Size | Value | ||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| +0 | Word | Flags:
| ||||||||||||||||||||||||||||||||||
| +2 | Longword | Access address | ||||||||||||||||||||||||||||||||||
| +6 | Word | IR | ||||||||||||||||||||||||||||||||||
| +8 | Word | SR | ||||||||||||||||||||||||||||||||||
| +10 | Longword | PC | ||||||||||||||||||||||||||||||||||
Format B
| Offset from SP | Size | Value |
|---|---|---|
| +0 | Word | SR |
| +2 | Longword | PC |
Vector list
| Vector # | Address | Exception name | Trigger condition | Stack frame |
| 0 | 000000 | Reset SP | Not really a vector. Used to initialize the stack pointer. | |
| 1 | 000004 | Reset PC | Reset/startup | |
| 2 | 000008 | Bus error | Bus cycle couldn't complete properly. | A |
| 3 | 00000C | Address error | Misaligned (odd) word or longword memory access. | A |
| 4 | 000010 | Illegal instruction | Tried executing an invalid opcode. | B |
| 5 | 000014 | Division by zero | DIVUed or DIVSed by zero. | B |
| 6 | 000018 | CHK instruction | CHK resulted in "out of bounds". | B |
| 7 | 00001C | TRAPV instruction | TRAPV with overflow flag set. | B |
| 8 | 000020 | Privilege violation | Use of privileged instruction. Never happens on the NeoGeo since the 68k always runs in supervisor mode. | B |
| 9 | 000024 | Trace | After each executed instruction when 68k is in trace mode (debugger function). | B |
| 10 | 000028 | Unimplemented instruction (line A) | Used to implement 680xx instructions in software. Not used on the NeoGeo. | B |
| 11 | 00002C | Unimplemented instruction (line F) | Used to implement 680xx instructions in software. Not used on the NeoGeo. | B |
| 12 | 000030 | Reserved/Unused on 68000 | ||
| 13 | 000034 | |||
| 14 | 000038 | |||
| 15 | 00003C | Uninitialized interrupt vector | Default vector used by uninitialized peripherals. | B? |
| 16 | 000040 | Reserved | ||
| 17 | 000044 | |||
| 18 | 000048 | |||
| 19 | 00004C | |||
| 20 | 000050 | |||
| 21 | 000054 | Normally reserved but used on the NeoGeo CD. See 68k interrupts. | ||
| 22 | 000058 | |||
| 23 | 00005C | |||
| 24 | 000060 | Spurious interrupt | No acknowledge from hardware. | |
| 25 | 000064 | Level 1 interrupt autovector | V-Blank (cart) / Timer interrupt (CD). | |
| 26 | 000068 | Level 2 interrupt autovector | Timer interrupt (cart) / V-Blank (CD). | |
| 27 | 00006C | Level 3 interrupt autovector | Cold boot (cart). | |
| 28 | 000070 | Level 4 interrupt autovector | Not used on the NeoGeo. | |
| 29 | 000074 | Level 5 interrupt autovector | Not used on the NeoGeo. | |
| 30 | 000078 | Level 6 interrupt autovector | Not used on the NeoGeo. | |
| 31 | 00007C | Level 7 interrupt autovector | Not used on the NeoGeo. | |
| 32 | 000080 | TRAP #0~15 | TRAP instructions. | 2 |
| 48~63 | 0000C0~0000FC | Reserved/Unused on 68000 | ||
| 64~255 | 000100~0003FF | User interrupt vectors |
Templates
For cartridge systems
org $0
dc.l $0010F300 ; Initial SP
dc.l $00C00402 ; Initial PC
dc.l $00C00408 ; Bus error
dc.l $00C0040E ; Address error
dc.l $00C0040E ; Illegal Instruction
dc.l $0000034C ; Divide by 0
dc.l $0000034E ; CHK Instruction
dc.l $0000034E ; TRAPV Instruction
dc.l $00C0041A ; Privilege Violation
dc.l $00C00420 ; Trace
dc.l $0000034E,$0000034E ; Emu
dc.l $00C00426,$00C00426,$00C00426 ; Reserved
dc.l $00C0042C ; Uninit. Int. Vector.
dc.l $00C00426,$00C00426,$00C00426,$00C00426 ; Reserved
dc.l $00C00426,$00C00426,$00C00426,$00C00426 ; Reserved
dc.l $00C00432 ; Spurious Interrupt
dc.l VBlank ; Level 1
dc.l IRQ2 ; Level 2
dc.l $00C00426 ; Level 3
dc.l $00C00426,$00C00426,$00C00426,$00C00426 ; Level 4~7
dc.l $0000056E,$0000056E,$0000056E,$0000056E ; Traps...
dc.l $0000056E,$0000056E,$FFFFFFFF,$FFFFFFFF
dc.l $FFFFFFFF,$FFFFFFFF,$FFFFFFFF,$FFFFFFFF
dc.l $FFFFFFFF,$FFFFFFFF,$FFFFFFFF,$FFFFFFFF
dc.l $FFFFFFFF,$FFFFFFFF,$FFFFFFFF,$FFFFFFFF
dc.l $FFFFFFFF,$FFFFFFFF,$FFFFFFFF,$FFFFFFFF
dc.l $FFFFFFFF,$FFFFFFFF,$FFFFFFFF,$FFFFFFFF
dc.l $FFFFFFFF,$FFFFFFFF,$FFFFFFFF,$FFFFFFFFFor CD systems
org $0
dc.l $0010F300,$00C00402,$00C00408,$00C0040E
dc.l $00C00414,$00C00426,$00C00426,$00C00426
dc.l $00C0041A,$00C00420,$00C00426,$00C00426
dc.l $00C00426,$00C00426,$00C00426,$00C0042C
dc.l $00C00522,$00C00528,$00C0052E,$00C00534
dc.l $00C0053A,$00C004F2,$00C004EC,$00C004E6
dc.l $00C004E0, IRQ2, VBlank, IRQ3
dc.l Generic, Generic, Generic, Generic
dc.l Generic, Generic, Generic, Generic
dc.l Generic, Generic, Generic, Generic
dc.l Generic, Generic, Generic, Generic
dc.l Generic, Generic, Generic, Generic
dc.l $00C00426,$00C00426,$00C00426,$00C00426
dc.l $00C00426,$00C00426,$00C00426,$00C00426
dc.l $00C00426,$00C00426,$00C00426,$00C00426
dc.l $00C00426,$00C00426,$00C00426,$00C00426