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exceptions.s
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/*
* Copyright (c) 2011 Emmanuel Vadot <[email protected]>
* Copyright (c) 2011 Furrtek <[email protected]>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
.include "defines.inc"
.global err_divzero
.global err_addr
.global err_illegal
.global err_bus
ERRORBOX_X = 10
ERRORBOX_Y = 9
err_divzero:
move.l 2(a7),(PCERROR)
movem.l d0-d7/a0-a6,-(a7)
lea text_divzero,a0
jmp DispErr
err_addr:
move.l 10(a7),(PCERROR)
movem.l d0-d7/a0-a6,-(a7)
lea text_addr,a0
jmp DispErr
err_illegal:
move.l 2(a7),(PCERROR)
movem.l d0-d7/a0-a6,-(a7)
lea text_illegal,a0
jmp DispErr
err_bus:
move.l 10(a7),(PCERROR)
movem.l d0-d7/a0-a6,-(a7)
lea text_bus,a0
jmp DispErr
|Do not use a0 until first text8_out here
DispErr:
move.b d0,(REG_DIPSW)
ori.w #0x0700,sr
|Def palette 15
move.w #BLACK,(BACKDROPCOLOR)
move.w #RED,(PALETTES+(15*32)+2)
move.w #0x0FB8,(PALETTES+(15*32)+4)
|Def palette 14
move.w #BLACK,(BACKDROPCOLOR)
move.w #0x0400,(PALETTES+(14*32)+2)
move.w #0x0FB8,(PALETTES+(14*32)+4)
move.w #FIXMAP+ERRORBOX_Y+(ERRORBOX_X*32),d2
move.l #14,d1
move.w #0x20,(REG_VRAMMOD)
.clfixlperrout:
move.w d2,(REG_VRAMADDR)
move.l #20,d0
.clfixlperrin:
move.w #0xF320,(REG_VRAMRW) | Palette $F, tile $320
move.b d0,(REG_DIPSW)
dbra d0,.clfixlperrin
addi.w #1,d2
dbra d1,.clfixlperrout
move.w #0xF000,d2
jsr text8_out
lea text_defs,a0
move.w #0xF000,d2
jsr text8_out
move.l #FIXMAP+ERRORBOX_Y+6+((ERRORBOX_X+1)*32),d3
move.l #8-1,d2
.printdataregs:
move.w d3,(REG_VRAMADDR)
move.l (a7)+,d0
jsr WriteRegister
addi.w #1,d3
dbra d2,.printdataregs
move.l #FIXMAP+ERRORBOX_Y+6+((ERRORBOX_X+11)*32),d3
move.l #7-1,d2
.printaddrregs:
move.w d3,(REG_VRAMADDR)
move.l (a7)+,d0
jsr WriteRegister
addi.w #1,d3
dbra d2,.printaddrregs
move.w #FIXMAP+ERRORBOX_Y+3+((ERRORBOX_X+4)*32),(REG_VRAMADDR)
move.l (PCERROR),d0
jsr WriteRegister
lp:
move.b d0,(REG_DIPSW)
jmp lp
WriteRegister:
move.w #0x20,(REG_VRAMMOD)
move.l d0,d1
move.l #8-1,d7
.writerlp:
move.b d0,(REG_DIPSW)
andi.l #0xF0000000,d0
rol.l #4,d0
jsr hexshift
addi.w #0x30,d0
ori.w #0xE000,d0 |Palette $E
move.w d0,(REG_VRAMRW)
lsl.l #4,d1
move.l d1,d0
dbra d7,.writerlp
rts
hexshift:
cmp.b #0xA,d0
blt.b .r
addq.w #7,d0
.r:
rts
.align 2
text_defs:
dc.w FIXMAP+ERRORBOX_Y+3+((ERRORBOX_X+1)*32)
.string "PC:\xFF\xFF\D0-D6: A0-A6:"
.align 2
text_addr:
dc.w FIXMAP+ERRORBOX_Y+1+((ERRORBOX_X+1)*32)
.string "ADDRESS ERROR\0"
.align 2
text_divzero:
dc.w FIXMAP+ERRORBOX_Y+1+((ERRORBOX_X+1)*32)
.string "DIVIDE BY ZERO\0"
.align 2
text_illegal:
dc.w FIXMAP+ERRORBOX_Y+1+((ERRORBOX_X+1)*32)
.string "ILLEGAL INSTRUCTION\0"
.align 2
text_bus:
dc.w FIXMAP+ERRORBOX_Y+1+((ERRORBOX_X+1)*32)
.string "BUS ERROR\0"
.bss
PCERROR: .long 0