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fpga_is_fu |
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; 6 5 0 2 I N T E R R U P T T E S T
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;
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; Copyright (C) 2013 Klaus Dormann
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;
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; This program is free software: you can redistribute it and/or modify
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; it under the terms of the GNU General Public License as published by
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; the Free Software Foundation, either version 3 of the License, or
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; (at your option) any later version.
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;
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; This program is distributed in the hope that it will be useful,
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; but WITHOUT ANY WARRANTY; without even the implied warranty of
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; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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; GNU General Public License for more details.
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;
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; You should have received a copy of the GNU General Public License
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; along with this program. If not, see .
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; This program is designed to test IRQ and NMI of a 6502 emulator. It requires
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; an internal or external feedback register to the IRQ & NMI inputs
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;
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; version 15-aug-2014
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; contact info at http://2m5.de or email K@2m5.de
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;
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; assembled with AS65 from http://www.kingswood-consulting.co.uk/assemblers/
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; command line switches: -l -m -s2 -w -h0
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; | | | | no page headers in listing
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; | | | wide listing (133 char/col)
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; | | write intel hex file instead of binary
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; | expand macros in listing
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; generate pass2 listing
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;
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; No IO - should be run from a monitor with access to registers.
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; To run load intel hex image with a load command, than alter PC to 400 hex and
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; enter a go command.
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; Loop on program counter determines error or successful completion of test.
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; Check listing for relevant traps (jump/branch *).
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;
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; Debugging hints:
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; Most of the code is written sequentially. if you hit a trap, check the
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; immediately preceeding code for the instruction to be tested. Results are
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; tested first, flags are checked second by pushing them onto the stack and
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; pulling them to the accumulator after the result was checked. The "real"
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; flags are no longer valid for the tested instruction at this time!
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; If the tested instruction was indexed, the relevant index (X or Y) must
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; also be checked. Opposed to the flags, X and Y registers are still valid.
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;
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; versions:
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; 19-jul-2013 1st version distributed for testing
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; 16-aug-2013 added error report to standard output option
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; 15-aug-2014 added filter to feedback (bit 7 will cause diag stop in emu)
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; C O N F I G U R A T I O N
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;
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;ROM_vectors MUST be writable & the I_flag MUST be alterable
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;load_data_direct (0=move from code segment, 1=load directly)
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;loading directly is preferred but may not be supported by your platform
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;0 produces only consecutive object code, 1 is not suitable for a binary image
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load_data_direct = 1
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;NMI & IRQ are tested with a feedback register
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;emulators diag register - set i_drive = 0 for a latch (74HC573)
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I_port = $bffc ;feedback port address
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I_ddr = 0 ;feedback DDR address, 0 = no DDR
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I_drive = 1 ;0 = totem pole, 1 = open collector
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IRQ_bit = 0 ;bit number of feedback to IRQ
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NMI_bit = 1 ;bit number of feedback to NMI, -1 if not available
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I_filter = $7f ;filtering bit 7 = diag stop
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;typical IO chip port B - set i_drive = 0 to avoid pullup resistors
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;I_port = $bfb2 ;feedback port address
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;I_ddr = $bfb3 ;feedback DDR address, 0 = no DDR
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;I_drive = 1 ;0 = totem pole, 1 = open collector
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;IRQ_bit = 0 ;bit number of feedback to IRQ
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;NMI_bit = 1 ;bit number of feedback to NMI, -1 if not available
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;I_filter = $ff ;no bits filtered
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;decimal mode flag during IRQ, NMI & BRK
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;D_clear = 0 ;0 = not cleared (NMOS), 1 = cleared (CMOS)
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D_clear = 1 ;0 = not cleared (NMOS), 1 = cleared (CMOS)
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;configure memory - try to stay away from memory used by the system
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;zero_page memory start address, 6 consecutive Bytes required
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zero_page = $a
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;data_segment memory start address, 4 consecutive Bytes required
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data_segment = $200
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;code_segment memory start address
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code_segment = $400
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;report errors through I/O channel (0=use standard self trap loops, 1=include
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;report.i65 as I/O channel)
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report = 0
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noopt ;do not take shortcuts
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;macros for error & success traps to allow user modification
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;example:
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;trap macro
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; jsr my_error_handler
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; endm
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;trap_eq macro
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; bne skip\?
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; trap ;failed equal (zero)
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;skip\?
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; endm
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;
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; my_error_handler should pop the calling address from the stack and report it.
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; putting larger portions of code (more than 3 bytes) inside the trap macro
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; may lead to branch range problems for some tests.
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if report = 0
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trap macro
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jmp * ;failed anyway
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endm
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trap_eq macro
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beq * ;failed equal (zero)
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endm
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trap_ne macro
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bne * ;failed not equal (non zero)
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endm
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; please observe that during the test the stack gets invalidated
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; therefore a RTS inside the success macro is not possible
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success macro
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jmp * ;test passed, no errors
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endm
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endif
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if report = 1
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trap macro
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jsr report_error
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endm
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trap_eq macro
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bne skip\?
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trap ;failed equal (zero)
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skip\?
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endm
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trap_ne macro
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beq skip\?
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trap ;failed not equal (non zero)
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skip\?
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endm
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; please observe that during the test the stack gets invalidated
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; therefore a RTS inside the success macro is not possible
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success macro
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jsr report_success
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endm
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endif
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carry equ %00000001 ;flag bits in status
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zero equ %00000010
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intdis equ %00000100
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decmode equ %00001000
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break equ %00010000
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reserv equ %00100000
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overfl equ %01000000
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minus equ %10000000
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fc equ carry
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fz equ zero
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fzc equ carry+zero
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fv equ overfl
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fvz equ overfl+zero
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fn equ minus
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fnc equ minus+carry
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fnz equ minus+zero
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fnzc equ minus+zero+carry
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fnv equ minus+overfl
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fao equ break+reserv ;bits always on after PHP, BRK
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fai equ fao+intdis ;+ forced interrupt disable
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m8 equ $ff ;8 bit mask
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m8i equ $ff&~intdis ;8 bit mask - interrupt disable
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;macros to set status
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push_stat macro ;setting flags in the processor status register
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lda #\1
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pha ;use stack to load status
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endm
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set_stat macro ;setting flags in the processor status register
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lda #\1
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pha ;use stack to load status
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plp
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endm
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if load_data_direct = 1
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data
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else
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bss ;uninitialized segment, copy of data at end of code!
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endif
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org zero_page
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;BRK, IRQ, NMI test interrupt save
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zpt
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irq_a ds 1 ;a register
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irq_x ds 1 ;x register
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irq_f ds 1 ;flags
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nmi_a ds 1 ;a register
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nmi_x ds 1 ;x register
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nmi_f ds 1 ;flags
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zp_bss
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;fixed stack locations
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lst_f equ $1fe ;last flags before interrupt
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lst_a equ $1ff ;last accumulator before interrupt
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org data_segment
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;concurrent NMI, IRQ & BRK test result
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nmi_count ds 1 ;lowest number handled first, $ff = never
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irq_count ds 1 ;separation-1 = instructions between interrupts
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brk_count ds 1
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;expected interrupt mask
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I_src ds 1 ;bit: 0=BRK, 1=IRQ, 2=NMI
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data_bss
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code
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org code_segment
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start cld
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lda #0 ;clear expected interrupts for 2nd run
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sta I_src
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ldx #$ff
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txs
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;initialize I/O for report channel
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if report = 1
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jsr report_init
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endif
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; load system vectors
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if load_data_direct != 1
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ldx #5
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ld_vect lda vec_init,x
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sta vec_bss,x
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dex
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bpl ld_vect
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endif
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; IRQ & NMI test - requires a feedback register
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if I_drive > 1
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ERROR ;invalid interrupt drive!
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endif
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if NMI_bit < 0
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if I_drive = 0 ;totem pole (push/pull, 0 -> I_port to force interrupt)
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I_set macro ibit ;ibit = interrupt bit
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lda I_port ;turn on interrupt by bit
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and #I_filter-(1<<\1)
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plp ;set flags
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pha ;save to verify
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php
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sta I_port ;interrupt next instruction plus outbound delay
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endm
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I_clr macro ibit ;ibit = interrupt bit
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lda I_port ;turn off interrupt by bit
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and #I_filter
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ora #(1<
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sta I_port
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endm
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I_clr IRQ_bit ;turn off IRQ
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if I_ddr != 0 ;with DDR
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lda I_ddr ;set DDR for IRQ to enabled
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and #I_filter
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ora #(1<
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sta I_ddr
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endif
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else ;open collector, 0 -> I_DDR or I_port to force interrupt
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if I_ddr != 0 ;with DDR
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I_set macro ibit ;ibit = interrupt bit
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lda I_ddr ;turn on interrupt by bit
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and #I_filter
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ora #(1<<\1)
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plp ;set flags
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pha ;save to verify
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php
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sta I_ddr ;interrupt next instruction plus outbound delay
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endm
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I_clr macro ibit ;ibit = interrupt bit
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lda I_ddr ;turn off interrupt by bit
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and #I_filter-(1<
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sta I_ddr
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endm
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I_clr IRQ_bit ;turn off IRQ
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lda I_port ;precharge IRQ
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and #I_filter-(1<
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sta I_port
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else ;no DDR
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I_set macro ibit ;ibit = interrupt bit
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lda I_port ;turn on interrupt by bit
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and #I_filter
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ora #(1<<\1)
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plp ;set flags
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pha ;save to verify
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php
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sta I_port ;interrupt next instruction plus outbound delay
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endm
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I_clr macro ibit ;ibit = interrupt bit
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lda I_port ;turn off interrupt by bit
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and #I_filter-(1<
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sta I_port
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endm
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I_clr IRQ_bit ;turn off IRQ
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endif
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endif
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else
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if I_drive = 0 ;totem pole (push/pull, 0 -> I_port to force interrupt)
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I_set macro ibit ;ibit = interrupt bit
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lda I_port ;turn on interrupt by bit
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if ibit > 7 ;set both NMI & IRQ
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and #I_filter-(1<
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else
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and #I_filter-(1<<\1)
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endif
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plp ;set flags
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pha ;save to verify
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php
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sta I_port ;interrupt next instruction plus outbound delay
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endm
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I_clr macro ibit ;ibit = interrupt bit
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lda I_port ;turn off interrupt by bit
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and #I_filter
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ora #(1<
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sta I_port
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endm
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I_clr IRQ_bit ;turn off IRQ & NMI
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I_clr NMI_bit
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if I_ddr != 0 ;with DDR
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lda I_ddr ;set DDR for IRQ & NMI to enabled
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and #I_filter
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ora #(1<
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sta I_ddr
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endif
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else ;open collector, 0 -> I_DDR or I_port to force interrupt
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if I_ddr != 0 ;with DDR
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I_set macro ibit ;ibit = interrupt bit
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lda I_ddr ;turn on interrupt by bit
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and #I_filter
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if ibit > 7 ;set both NMI & IRQ
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ora #(1<
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else
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ora #(1<<\1)
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endif
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plp ;set flags
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pha ;save to verify
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php
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sta I_ddr ;interrupt next instruction plus outbound delay
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endm
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| 349 |
|
|
I_clr macro ibit ;ibit = interrupt bit
|
| 350 |
|
|
lda I_ddr ;turn off interrupt by bit
|
| 351 |
|
|
and #I_filter-(1<
|
| 352 |
|
|
sta I_ddr
|
| 353 |
|
|
endm
|
| 354 |
|
|
I_clr IRQ_bit ;turn off IRQ & NMI
|
| 355 |
|
|
I_clr NMI_bit
|
| 356 |
|
|
lda I_port ;precharge IRQ & NMI
|
| 357 |
|
|
and #I_filter-(1<
|
| 358 |
|
|
sta I_port
|
| 359 |
|
|
else ;no DDR
|
| 360 |
|
|
I_set macro ibit ;ibit = interrupt bit
|
| 361 |
|
|
lda I_port ;turn on interrupt by bit
|
| 362 |
|
|
and #I_filter
|
| 363 |
|
|
if ibit > 7 ;set both NMI & IRQ
|
| 364 |
|
|
ora #(1<
|
| 365 |
|
|
else
|
| 366 |
|
|
ora #(1<<\1)
|
| 367 |
|
|
endif
|
| 368 |
|
|
plp ;set flags
|
| 369 |
|
|
pha ;save to verify
|
| 370 |
|
|
php
|
| 371 |
|
|
sta I_port ;interrupt next instruction plus outbound delay
|
| 372 |
|
|
endm
|
| 373 |
|
|
I_clr macro ibit ;ibit = interrupt bit
|
| 374 |
|
|
lda I_port ;turn off interrupt by bit
|
| 375 |
|
|
and #I_filter-(1<
|
| 376 |
|
|
sta I_port
|
| 377 |
|
|
endm
|
| 378 |
|
|
I_clr IRQ_bit ;turn off IRQ & NMI
|
| 379 |
|
|
I_clr NMI_bit
|
| 380 |
|
|
endif
|
| 381 |
|
|
endif
|
| 382 |
|
|
endif
|
| 383 |
|
|
|
| 384 |
|
|
; IRQ integrity test
|
| 385 |
|
|
; test for clear flags seen in IRQ vector
|
| 386 |
|
|
lda #2 ;set expected interrupt source IRQ
|
| 387 |
|
|
sta I_src
|
| 388 |
|
|
push_stat 0
|
| 389 |
|
|
I_set IRQ_bit
|
| 390 |
|
|
nop ;allow 6 cycles for interrupt to trip
|
| 391 |
|
|
nop
|
| 392 |
|
|
nop
|
| 393 |
|
|
lda I_src
|
| 394 |
|
|
trap_ne ;IRQ timeout
|
| 395 |
|
|
tsx
|
| 396 |
|
|
cpx #$ff-2 ;original accu & flags remain on stack
|
| 397 |
|
|
trap_ne ;returned SP
|
| 398 |
|
|
lda irq_f ;flags seen in IRQ vector
|
| 399 |
|
|
if D_clear = 1
|
| 400 |
|
|
and #decmode
|
| 401 |
|
|
trap_ne ;D-flag not cleared
|
| 402 |
|
|
lda irq_f
|
| 403 |
|
|
eor lst_f ;turn off unchanged bits
|
| 404 |
|
|
and #m8-fai-decmode ;mask untested other flags
|
| 405 |
|
|
trap_ne ;other flags (N,V,Z,C) changed
|
| 406 |
|
|
else
|
| 407 |
|
|
eor lst_f ;turn off unchanged bits
|
| 408 |
|
|
and #m8-fai ;mask untested other flags
|
| 409 |
|
|
trap_ne ;other flags (N,V,Z,C,D) changed
|
| 410 |
|
|
endif
|
| 411 |
|
|
ldx #$ff ;reset stack pointer
|
| 412 |
|
|
txs
|
| 413 |
|
|
; test all other registers
|
| 414 |
|
|
ldx #'I'
|
| 415 |
|
|
ldy #'R'
|
| 416 |
|
|
lda #2 ;set expected interrupt source IRQ
|
| 417 |
|
|
sta I_src
|
| 418 |
|
|
push_stat 0
|
| 419 |
|
|
I_set IRQ_bit
|
| 420 |
|
|
dey ;Y count will fail, if instructions are skipped
|
| 421 |
|
|
dey
|
| 422 |
|
|
dey
|
| 423 |
|
|
dey
|
| 424 |
|
|
php ;check processor status later
|
| 425 |
|
|
cpx #('I'+1) ;returned registers OK?
|
| 426 |
|
|
trap_ne ;returned X
|
| 427 |
|
|
cpy #('R'-7)
|
| 428 |
|
|
trap_ne ;returned Y
|
| 429 |
|
|
cmp #'Q'
|
| 430 |
|
|
trap_ne ;returned A
|
| 431 |
|
|
tsx
|
| 432 |
|
|
cpx #$ff-3
|
| 433 |
|
|
trap_ne ;returned SP
|
| 434 |
|
|
pla ;flags
|
| 435 |
|
|
eor lst_f
|
| 436 |
|
|
and #$ff-fnz ;ignore flags changed by dey
|
| 437 |
|
|
trap_ne ;returned flags
|
| 438 |
|
|
lda irq_a ;accu seen in IRQ vector
|
| 439 |
|
|
cmp lst_a
|
| 440 |
|
|
trap_ne ;IRQ A received
|
| 441 |
|
|
ldx #$ff ;reset stack pointer
|
| 442 |
|
|
txs
|
| 443 |
|
|
; repeat with reversed registers
|
| 444 |
|
|
ldx #$ff-'I'
|
| 445 |
|
|
ldy #$ff-'R'
|
| 446 |
|
|
lda #2 ;set expected interrupt source IRQ
|
| 447 |
|
|
sta I_src
|
| 448 |
|
|
push_stat $ff-intdis
|
| 449 |
|
|
I_set IRQ_bit
|
| 450 |
|
|
dey ;Y count will fail, if instructions are skipped
|
| 451 |
|
|
dey
|
| 452 |
|
|
dey
|
| 453 |
|
|
dey
|
| 454 |
|
|
php ;check processor status later
|
| 455 |
|
|
cpx #($ff-'I'+1) ;returned registers OK?
|
| 456 |
|
|
trap_ne ;returned X
|
| 457 |
|
|
cpy #($ff-'R'-7)
|
| 458 |
|
|
trap_ne ;returned Y
|
| 459 |
|
|
cmp #'Q'
|
| 460 |
|
|
trap_ne ;returned A
|
| 461 |
|
|
tsx
|
| 462 |
|
|
cpx #$ff-3
|
| 463 |
|
|
trap_ne ;returned SP
|
| 464 |
|
|
pla ;flags
|
| 465 |
|
|
eor lst_f
|
| 466 |
|
|
and #$ff-fnz ;ignore flags changed by dey
|
| 467 |
|
|
trap_ne ;returned flags
|
| 468 |
|
|
lda irq_a ;accu seen in IRQ vector
|
| 469 |
|
|
cmp lst_a
|
| 470 |
|
|
trap_ne ;IRQ A received
|
| 471 |
|
|
ldx #$ff ;reset stack pointer
|
| 472 |
|
|
txs
|
| 473 |
|
|
; retest for set flags seen in IRQ vector
|
| 474 |
|
|
lda #2 ;set expected interrupt source IRQ
|
| 475 |
|
|
sta I_src
|
| 476 |
|
|
push_stat $ff-intdis
|
| 477 |
|
|
I_set IRQ_bit
|
| 478 |
|
|
nop ;allow 6 cycles for interrupt to trip
|
| 479 |
|
|
nop
|
| 480 |
|
|
nop
|
| 481 |
|
|
lda I_src
|
| 482 |
|
|
trap_ne ;IRQ timeout
|
| 483 |
|
|
tsx
|
| 484 |
|
|
cpx #$ff-2 ;original accu & flags remain on stack
|
| 485 |
|
|
trap_ne ;returned SP
|
| 486 |
|
|
lda irq_f ;flags seen in IRQ vector
|
| 487 |
|
|
if D_clear = 1
|
| 488 |
|
|
and #decmode
|
| 489 |
|
|
trap_ne ;D-flag not cleared
|
| 490 |
|
|
lda irq_f
|
| 491 |
|
|
eor lst_f ;turn off unchanged bits
|
| 492 |
|
|
and #m8-fai-decmode ;mask untested other flags
|
| 493 |
|
|
trap_ne ;other flags (N,V,Z,C) changed
|
| 494 |
|
|
else
|
| 495 |
|
|
eor lst_f ;turn off unchanged bits
|
| 496 |
|
|
and #m8-fai ;mask untested other flags
|
| 497 |
|
|
trap_ne ;other flags (N,V,Z,C,D) changed
|
| 498 |
|
|
endif
|
| 499 |
|
|
ldx #$ff ;reset stack pointer
|
| 500 |
|
|
txs
|
| 501 |
|
|
|
| 502 |
|
|
; BRK integrity test
|
| 503 |
|
|
; test for clear flags seen in IRQ vector
|
| 504 |
|
|
lda #1 ;set expected interrupt source BRK
|
| 505 |
|
|
sta I_src
|
| 506 |
|
|
set_stat 0
|
| 507 |
|
|
pha ;save entry registers
|
| 508 |
|
|
php
|
| 509 |
|
|
brk
|
| 510 |
|
|
nop ;should not be executed
|
| 511 |
|
|
nop ;allow 6 cycles for interrupt to trip
|
| 512 |
|
|
nop
|
| 513 |
|
|
nop
|
| 514 |
|
|
lda I_src
|
| 515 |
|
|
trap_ne ;IRQ timeout
|
| 516 |
|
|
tsx
|
| 517 |
|
|
cpx #$ff-2 ;original accu & flags remain on stack
|
| 518 |
|
|
trap_ne ;returned SP
|
| 519 |
|
|
lda irq_f ;flags seen in IRQ vector
|
| 520 |
|
|
if D_clear = 1
|
| 521 |
|
|
and #decmode
|
| 522 |
|
|
trap_ne ;D-flag not cleared
|
| 523 |
|
|
lda irq_f
|
| 524 |
|
|
eor lst_f ;turn off unchanged bits
|
| 525 |
|
|
and #m8-fai-decmode ;mask untested other flags
|
| 526 |
|
|
trap_ne ;other flags (N,V,Z,C) changed
|
| 527 |
|
|
else
|
| 528 |
|
|
eor lst_f ;turn off unchanged bits
|
| 529 |
|
|
and #m8-fai ;mask untested other flags
|
| 530 |
|
|
trap_ne ;other flags (N,V,Z,C,D) changed
|
| 531 |
|
|
endif
|
| 532 |
|
|
ldx #$ff ;reset stack pointer
|
| 533 |
|
|
txs
|
| 534 |
|
|
; test all other registers
|
| 535 |
|
|
ldx #'B'
|
| 536 |
|
|
ldy #'R'
|
| 537 |
|
|
lda #1 ;set expected interrupt source BRK
|
| 538 |
|
|
sta I_src
|
| 539 |
|
|
set_stat 0
|
| 540 |
|
|
pha ;save entry
|
| 541 |
|
|
php
|
| 542 |
|
|
brk
|
| 543 |
|
|
dey ;should not be executed
|
| 544 |
|
|
dey ;Y count will fail, if return address is wrong
|
| 545 |
|
|
dey
|
| 546 |
|
|
dey
|
| 547 |
|
|
dey
|
| 548 |
|
|
php ;check processor status later
|
| 549 |
|
|
cpx #('B'+1) ;returned registers OK?
|
| 550 |
|
|
trap_ne ;returned X
|
| 551 |
|
|
cpy #('R'-7)
|
| 552 |
|
|
trap_ne ;returned Y
|
| 553 |
|
|
cmp #'K'
|
| 554 |
|
|
trap_ne ;returned A
|
| 555 |
|
|
tsx
|
| 556 |
|
|
cpx #$ff-3
|
| 557 |
|
|
trap_ne ;returned SP
|
| 558 |
|
|
pla ;flags
|
| 559 |
|
|
eor lst_f
|
| 560 |
|
|
and #$ff-fnz ;ignore flags changed by dey
|
| 561 |
|
|
trap_ne ;returned flags
|
| 562 |
|
|
lda irq_a ;accu seen in IRQ vector
|
| 563 |
|
|
cmp lst_a
|
| 564 |
|
|
trap_ne ;IRQ A received
|
| 565 |
|
|
ldx #$ff ;reset stack pointer
|
| 566 |
|
|
txs
|
| 567 |
|
|
; repeat with reversed registers
|
| 568 |
|
|
ldx #$ff-'B'
|
| 569 |
|
|
ldy #$ff-'R'
|
| 570 |
|
|
lda #1 ;set expected interrupt source BRK
|
| 571 |
|
|
sta I_src
|
| 572 |
|
|
set_stat $ff
|
| 573 |
|
|
pha ;save entry registers
|
| 574 |
|
|
php
|
| 575 |
|
|
brk
|
| 576 |
|
|
dey ;should not be executed
|
| 577 |
|
|
dey ;Y count will fail, if return address is wrong
|
| 578 |
|
|
dey
|
| 579 |
|
|
dey
|
| 580 |
|
|
dey
|
| 581 |
|
|
php ;check processor status later
|
| 582 |
|
|
cpx #($ff-'B'+1) ;returned registers OK?
|
| 583 |
|
|
trap_ne ;returned X
|
| 584 |
|
|
cpy #($ff-'R'-7)
|
| 585 |
|
|
trap_ne ;returned Y
|
| 586 |
|
|
cmp #'K'
|
| 587 |
|
|
trap_ne ;returned A
|
| 588 |
|
|
tsx
|
| 589 |
|
|
cpx #$ff-3
|
| 590 |
|
|
trap_ne ;returned SP
|
| 591 |
|
|
pla ;flags
|
| 592 |
|
|
eor lst_f
|
| 593 |
|
|
and #$ff-fnz ;ignore flags changed by dey
|
| 594 |
|
|
trap_ne ;returned flags
|
| 595 |
|
|
lda irq_a ;accu seen in IRQ vector
|
| 596 |
|
|
cmp lst_a
|
| 597 |
|
|
trap_ne ;IRQ A received
|
| 598 |
|
|
ldx #$ff ;reset stack pointer
|
| 599 |
|
|
txs
|
| 600 |
|
|
; retest for set flags seen in IRQ vector
|
| 601 |
|
|
lda #1 ;set expected interrupt source BRK
|
| 602 |
|
|
sta I_src
|
| 603 |
|
|
set_stat $ff
|
| 604 |
|
|
pha ;save entry registers
|
| 605 |
|
|
php
|
| 606 |
|
|
brk
|
| 607 |
|
|
nop ;should not be executed
|
| 608 |
|
|
nop ;allow 6 cycles for interrupt to trip
|
| 609 |
|
|
nop
|
| 610 |
|
|
nop
|
| 611 |
|
|
lda I_src
|
| 612 |
|
|
trap_ne ;IRQ timeout
|
| 613 |
|
|
tsx
|
| 614 |
|
|
cpx #$ff-2 ;original accu & flags remain on stack
|
| 615 |
|
|
trap_ne ;returned SP
|
| 616 |
|
|
lda irq_f ;flags seen in IRQ vector
|
| 617 |
|
|
if D_clear = 1
|
| 618 |
|
|
and #decmode
|
| 619 |
|
|
trap_ne ;D-flag not cleared
|
| 620 |
|
|
lda irq_f
|
| 621 |
|
|
eor lst_f ;turn off unchanged bits
|
| 622 |
|
|
and #m8-fai-decmode ;mask untested other flags
|
| 623 |
|
|
trap_ne ;other flags (N,V,Z,C) changed
|
| 624 |
|
|
else
|
| 625 |
|
|
eor lst_f ;turn off unchanged bits
|
| 626 |
|
|
and #m8-fai ;mask untested other flags
|
| 627 |
|
|
trap_ne ;other flags (N,V,Z,C,D) changed
|
| 628 |
|
|
endif
|
| 629 |
|
|
ldx #$ff ;reset stack pointer
|
| 630 |
|
|
txs
|
| 631 |
|
|
|
| 632 |
|
|
if NMI_bit < 0
|
| 633 |
|
|
; test IRQ with interrupts disabled
|
| 634 |
|
|
ldx #0
|
| 635 |
|
|
lda #0
|
| 636 |
|
|
sta I_src
|
| 637 |
|
|
push_stat intdis
|
| 638 |
|
|
I_set IRQ_bit ;IRQ pending
|
| 639 |
|
|
inx
|
| 640 |
|
|
inx
|
| 641 |
|
|
inx
|
| 642 |
|
|
ldx #0
|
| 643 |
|
|
lda #2 ;now re-enable IRQ
|
| 644 |
|
|
sta I_src
|
| 645 |
|
|
cli
|
| 646 |
|
|
inx
|
| 647 |
|
|
inx
|
| 648 |
|
|
inx
|
| 649 |
|
|
lda I_src ;test IRQ done?
|
| 650 |
|
|
trap_ne
|
| 651 |
|
|
ldx #$ff ;purge stack
|
| 652 |
|
|
txs
|
| 653 |
|
|
|
| 654 |
|
|
ldx #0 ;now overlap IRQ & BRK
|
| 655 |
|
|
lda #3
|
| 656 |
|
|
sta I_src
|
| 657 |
|
|
lda #$ff ;measure timing
|
| 658 |
|
|
sta nmi_count
|
| 659 |
|
|
sta irq_count
|
| 660 |
|
|
sta brk_count
|
| 661 |
|
|
push_stat 0
|
| 662 |
|
|
I_set IRQ_bit ;trigger IRQ
|
| 663 |
|
|
else
|
| 664 |
|
|
; NMI integrity test
|
| 665 |
|
|
; test for clear flags seen in NMI vector
|
| 666 |
|
|
lda #4 ;set expected interrupt source NMI
|
| 667 |
|
|
sta I_src
|
| 668 |
|
|
push_stat 0
|
| 669 |
|
|
I_set NMI_bit
|
| 670 |
|
|
nop ;allow 6 cycles for interrupt to trip
|
| 671 |
|
|
nop
|
| 672 |
|
|
nop
|
| 673 |
|
|
lda I_src
|
| 674 |
|
|
trap_ne ;NMI timeout
|
| 675 |
|
|
tsx
|
| 676 |
|
|
cpx #$ff-2 ;original accu & flags remain on stack
|
| 677 |
|
|
trap_ne ;returned SP
|
| 678 |
|
|
lda nmi_f ;flags seen in NMI vector
|
| 679 |
|
|
if D_clear = 1
|
| 680 |
|
|
and #decmode
|
| 681 |
|
|
trap_ne ;D-flag not cleared
|
| 682 |
|
|
lda nmi_f
|
| 683 |
|
|
eor lst_f ;turn off unchanged bits
|
| 684 |
|
|
and #m8-fai-decmode ;mask untested other flags
|
| 685 |
|
|
trap_ne ;other flags (N,V,Z,C) changed
|
| 686 |
|
|
else
|
| 687 |
|
|
eor lst_f ;turn off unchanged bits
|
| 688 |
|
|
and #m8-fai ;mask untested other flags
|
| 689 |
|
|
trap_ne ;other flags (N,V,Z,C,D) changed
|
| 690 |
|
|
endif
|
| 691 |
|
|
ldx #$ff ;reset stack pointer
|
| 692 |
|
|
txs
|
| 693 |
|
|
; test all other registers
|
| 694 |
|
|
ldx #'N'
|
| 695 |
|
|
ldy #'M'
|
| 696 |
|
|
lda #4 ;set expected interrupt source NMI
|
| 697 |
|
|
sta I_src
|
| 698 |
|
|
push_stat 0
|
| 699 |
|
|
I_set NMI_bit
|
| 700 |
|
|
dey ;Y count will fail, if instructions are skipped
|
| 701 |
|
|
dey
|
| 702 |
|
|
dey
|
| 703 |
|
|
dey
|
| 704 |
|
|
php ;check processor status later
|
| 705 |
|
|
cpx #('N'+1) ;returned registers OK?
|
| 706 |
|
|
trap_ne ;returned X
|
| 707 |
|
|
cpy #('M'-7)
|
| 708 |
|
|
trap_ne ;returned Y
|
| 709 |
|
|
cmp #'I'
|
| 710 |
|
|
trap_ne ;returned A
|
| 711 |
|
|
tsx
|
| 712 |
|
|
cpx #$ff-3
|
| 713 |
|
|
trap_ne ;returned SP
|
| 714 |
|
|
pla ;flags
|
| 715 |
|
|
eor lst_f
|
| 716 |
|
|
and #$ff-fnz ;ignore flags changed by dey
|
| 717 |
|
|
trap_ne ;returned flags
|
| 718 |
|
|
lda nmi_a ;accu seen in NMI vector
|
| 719 |
|
|
cmp lst_a
|
| 720 |
|
|
trap_ne ;NMI A received
|
| 721 |
|
|
ldx #$ff ;reset stack pointer
|
| 722 |
|
|
txs
|
| 723 |
|
|
; repeat with reversed registers
|
| 724 |
|
|
ldx #$ff-'N'
|
| 725 |
|
|
ldy #$ff-'M'
|
| 726 |
|
|
lda #4 ;set expected interrupt source NMI
|
| 727 |
|
|
sta I_src
|
| 728 |
|
|
push_stat $ff-intdis
|
| 729 |
|
|
I_set NMI_bit
|
| 730 |
|
|
dey ;Y count will fail, if instructions are skipped
|
| 731 |
|
|
dey
|
| 732 |
|
|
dey
|
| 733 |
|
|
dey
|
| 734 |
|
|
php ;check processor status later
|
| 735 |
|
|
cpx #($ff-'N'+1) ;returned registers OK?
|
| 736 |
|
|
trap_ne ;returned X
|
| 737 |
|
|
cpy #($ff-'M'-7)
|
| 738 |
|
|
trap_ne ;returned Y
|
| 739 |
|
|
cmp #'I'
|
| 740 |
|
|
trap_ne ;returned A
|
| 741 |
|
|
tsx
|
| 742 |
|
|
cpx #$ff-3
|
| 743 |
|
|
trap_ne ;returned SP
|
| 744 |
|
|
pla ;flags
|
| 745 |
|
|
eor lst_f
|
| 746 |
|
|
and #$ff-fnz ;ignore flags changed by dey
|
| 747 |
|
|
trap_ne ;returned flags
|
| 748 |
|
|
lda nmi_a ;accu seen in NMI vector
|
| 749 |
|
|
cmp lst_a
|
| 750 |
|
|
trap_ne ;NMI A received
|
| 751 |
|
|
ldx #$ff ;reset stack pointer
|
| 752 |
|
|
txs
|
| 753 |
|
|
; retest for set flags seen in NMI vector
|
| 754 |
|
|
lda #4 ;set expected interrupt source NMI
|
| 755 |
|
|
sta I_src
|
| 756 |
|
|
push_stat $ff-intdis
|
| 757 |
|
|
I_set NMI_bit
|
| 758 |
|
|
nop ;allow 6 cycles for interrupt to trip
|
| 759 |
|
|
nop
|
| 760 |
|
|
nop
|
| 761 |
|
|
lda I_src
|
| 762 |
|
|
trap_ne ;NMI timeout
|
| 763 |
|
|
tsx
|
| 764 |
|
|
cpx #$ff-2 ;original accu & flags remain on stack
|
| 765 |
|
|
trap_ne ;returned SP
|
| 766 |
|
|
lda nmi_f ;flags seen in NMI vector
|
| 767 |
|
|
if D_clear = 1
|
| 768 |
|
|
and #decmode
|
| 769 |
|
|
trap_ne ;D-flag not cleared
|
| 770 |
|
|
lda nmi_f
|
| 771 |
|
|
eor lst_f ;turn off unchanged bits
|
| 772 |
|
|
and #m8-fai-decmode ;mask untested other flags
|
| 773 |
|
|
trap_ne ;other flags (N,V,Z,C) changed
|
| 774 |
|
|
else
|
| 775 |
|
|
eor lst_f ;turn off unchanged bits
|
| 776 |
|
|
and #m8-fai ;mask untested other flags
|
| 777 |
|
|
trap_ne ;other flags (N,V,Z,C,D) changed
|
| 778 |
|
|
endif
|
| 779 |
|
|
ldx #$ff ;reset stack pointer
|
| 780 |
|
|
txs
|
| 781 |
|
|
|
| 782 |
|
|
; test IRQ & NMI with interrupts disabled
|
| 783 |
|
|
ldx #0
|
| 784 |
|
|
lda #4 ;set expected interrupt NMI only
|
| 785 |
|
|
sta I_src
|
| 786 |
|
|
push_stat intdis
|
| 787 |
|
|
I_set 8 ;both interrupts pending
|
| 788 |
|
|
inx
|
| 789 |
|
|
inx
|
| 790 |
|
|
inx
|
| 791 |
|
|
lda I_src ;test NMI done?
|
| 792 |
|
|
trap_ne
|
| 793 |
|
|
ldx #0
|
| 794 |
|
|
lda #2 ;now re-enable IRQ
|
| 795 |
|
|
sta I_src
|
| 796 |
|
|
cli
|
| 797 |
|
|
inx
|
| 798 |
|
|
inx
|
| 799 |
|
|
inx
|
| 800 |
|
|
lda I_src ;test IRQ done?
|
| 801 |
|
|
trap_ne
|
| 802 |
|
|
ldx #$ff ;purge stack
|
| 803 |
|
|
txs
|
| 804 |
|
|
|
| 805 |
|
|
;test overlapping NMI, IRQ & BRK
|
| 806 |
|
|
ldx #0
|
| 807 |
|
|
lda #7
|
| 808 |
|
|
sta I_src
|
| 809 |
|
|
lda #$ff ;measure timing
|
| 810 |
|
|
sta nmi_count
|
| 811 |
|
|
sta irq_count
|
| 812 |
|
|
sta brk_count
|
| 813 |
|
|
push_stat 0
|
| 814 |
|
|
I_set 8 ;trigger NMI + IRQ
|
| 815 |
|
|
endif
|
| 816 |
|
|
brk
|
| 817 |
|
|
inx
|
| 818 |
|
|
inx
|
| 819 |
|
|
inx
|
| 820 |
|
|
inx
|
| 821 |
|
|
inx
|
| 822 |
|
|
inx
|
| 823 |
|
|
inx
|
| 824 |
|
|
inx
|
| 825 |
|
|
lda I_src ;test all done?
|
| 826 |
|
|
;may fail due to a bug on a real NMOS 6502 - NMI could mask BRK
|
| 827 |
|
|
trap_ne ;lost an interrupt
|
| 828 |
|
|
|
| 829 |
|
|
; S U C C E S S ************************************************
|
| 830 |
|
|
; -------------
|
| 831 |
|
|
success ;if you get here everything went well
|
| 832 |
|
|
; -------------
|
| 833 |
|
|
; S U C C E S S ************************************************
|
| 834 |
|
|
; check data_segment +0 to +2 for sequence of concurrent interrupts
|
| 835 |
|
|
; e.g. 0x200 = NMI, 0x201 = IRQ, 0x202 = BRK, lower values = earlier
|
| 836 |
|
|
jmp start ;run again
|
| 837 |
|
|
|
| 838 |
|
|
; manual tests for the WAI opcode of the 65c02
|
| 839 |
|
|
|
| 840 |
|
|
wai macro
|
| 841 |
|
|
db $cb ;WAI opcode
|
| 842 |
|
|
endm
|
| 843 |
|
|
|
| 844 |
|
|
; requires single step operation, report = 0
|
| 845 |
|
|
; set PC to the 1st instruction of the test
|
| 846 |
|
|
; step to the WAI opcode, then manually tie the IRQ input low
|
| 847 |
|
|
; continue to step until you see the PC advance, then remove IRQ
|
| 848 |
|
|
; allow the routine to complete.
|
| 849 |
|
|
|
| 850 |
|
|
; WAI with interrupts disabled
|
| 851 |
|
|
ldx #$ff
|
| 852 |
|
|
txs
|
| 853 |
|
|
ldy #3
|
| 854 |
|
|
lda #0 ;IRQ not expected
|
| 855 |
|
|
sta I_src
|
| 856 |
|
|
set_stat intdis
|
| 857 |
|
|
wai
|
| 858 |
|
|
dey
|
| 859 |
|
|
dey
|
| 860 |
|
|
dey
|
| 861 |
|
|
trap_ne ;skipped opcodes!
|
| 862 |
|
|
|
| 863 |
|
|
success
|
| 864 |
|
|
|
| 865 |
|
|
; WAI with interrupts enabled
|
| 866 |
|
|
ldx #$ff
|
| 867 |
|
|
txs
|
| 868 |
|
|
ldy #7
|
| 869 |
|
|
lda #2 ;IRQ expected
|
| 870 |
|
|
sta I_src
|
| 871 |
|
|
set_stat 0
|
| 872 |
|
|
wai
|
| 873 |
|
|
dey
|
| 874 |
|
|
dey
|
| 875 |
|
|
dey
|
| 876 |
|
|
lda I_src
|
| 877 |
|
|
trap_ne ;IRQ vector not called
|
| 878 |
|
|
dey
|
| 879 |
|
|
trap_ne ;skipped opcodes!
|
| 880 |
|
|
|
| 881 |
|
|
success
|
| 882 |
|
|
|
| 883 |
|
|
; manual test for the STP opcode of the 65c02
|
| 884 |
|
|
|
| 885 |
|
|
stp macro
|
| 886 |
|
|
db $db ;STP opcode
|
| 887 |
|
|
endm
|
| 888 |
|
|
|
| 889 |
|
|
; set PC to the 1st instruction of the test, then run
|
| 890 |
|
|
nop
|
| 891 |
|
|
nop
|
| 892 |
|
|
stp ;expected end of operation
|
| 893 |
|
|
nop
|
| 894 |
|
|
nop
|
| 895 |
|
|
trap ;overran STP
|
| 896 |
|
|
|
| 897 |
|
|
;end of manual tests
|
| 898 |
|
|
|
| 899 |
|
|
;---------------------------------------------------------------------------
|
| 900 |
|
|
;trap in case of unexpected IRQ, NMI, BRK, RESET - IRQ, NMI, BRK test target
|
| 901 |
|
|
dey
|
| 902 |
|
|
dey
|
| 903 |
|
|
nmi_trap
|
| 904 |
|
|
if NMI_bit < 0
|
| 905 |
|
|
dey
|
| 906 |
|
|
dey
|
| 907 |
|
|
dey
|
| 908 |
|
|
trap ;unexpected NMI
|
| 909 |
|
|
else
|
| 910 |
|
|
php ;either SP or Y count will fail, if we do not hit
|
| 911 |
|
|
dey
|
| 912 |
|
|
dey
|
| 913 |
|
|
dey
|
| 914 |
|
|
sta nmi_a ;save regsters during NMI
|
| 915 |
|
|
stx nmi_x
|
| 916 |
|
|
pla
|
| 917 |
|
|
pha
|
| 918 |
|
|
sta nmi_f
|
| 919 |
|
|
lda I_src ;NMI expected?
|
| 920 |
|
|
and #4
|
| 921 |
|
|
trap_eq ;unexpexted NMI - check stack for conditions
|
| 922 |
|
|
pla ;test I-flag was set
|
| 923 |
|
|
pha
|
| 924 |
|
|
and #intdis
|
| 925 |
|
|
trap_eq ;I-flag not set
|
| 926 |
|
|
pla ;return with other flags reversed
|
| 927 |
|
|
eor #m8-fai-decmode
|
| 928 |
|
|
pha
|
| 929 |
|
|
tsx
|
| 930 |
|
|
lda $102,x ;test break on stack
|
| 931 |
|
|
and #break
|
| 932 |
|
|
trap_ne ;unexpected B-flag! - this may fail on a real 6502
|
| 933 |
|
|
;due to a hardware bug on concurrent BRK & NMI
|
| 934 |
|
|
lda I_src ;mark expected NMI has occured
|
| 935 |
|
|
and #$ff-4
|
| 936 |
|
|
sta I_src
|
| 937 |
|
|
I_clr NMI_bit
|
| 938 |
|
|
ldx nmi_x
|
| 939 |
|
|
inx
|
| 940 |
|
|
stx nmi_count
|
| 941 |
|
|
lda #'I' ;mark (NM)I
|
| 942 |
|
|
plp ;should be reversed by rti
|
| 943 |
|
|
rti
|
| 944 |
|
|
endif
|
| 945 |
|
|
|
| 946 |
|
|
res_trap
|
| 947 |
|
|
trap ;unexpected RESET
|
| 948 |
|
|
|
| 949 |
|
|
dey
|
| 950 |
|
|
dey
|
| 951 |
|
|
irq_trap ;BRK & IRQ test
|
| 952 |
|
|
php ;either SP or Y count will fail, if we do not hit
|
| 953 |
|
|
dey
|
| 954 |
|
|
dey
|
| 955 |
|
|
dey
|
| 956 |
|
|
sta irq_a ;save registers during IRQ/BRK
|
| 957 |
|
|
stx irq_x
|
| 958 |
|
|
pla
|
| 959 |
|
|
pha
|
| 960 |
|
|
sta irq_f
|
| 961 |
|
|
lda I_src ;IRQ expected?
|
| 962 |
|
|
and #3
|
| 963 |
|
|
trap_eq ;unexpexted IRQ/BRK - check stack for conditions
|
| 964 |
|
|
pla ;test I-flag was set
|
| 965 |
|
|
pha
|
| 966 |
|
|
and #intdis
|
| 967 |
|
|
trap_eq ;I-flag not set
|
| 968 |
|
|
pla ;return with other flags reversed
|
| 969 |
|
|
eor #m8-fai-decmode
|
| 970 |
|
|
pha
|
| 971 |
|
|
tsx
|
| 972 |
|
|
lda $102,x ;test break on stack
|
| 973 |
|
|
and #break
|
| 974 |
|
|
bne brk_trap
|
| 975 |
|
|
|
| 976 |
|
|
lda I_src ;IRQ expected?
|
| 977 |
|
|
and #2
|
| 978 |
|
|
trap_eq ;unexpexted IRQ - check stack for conditions
|
| 979 |
|
|
lda I_src ;mark expected IRQ has occured
|
| 980 |
|
|
and #$ff-2
|
| 981 |
|
|
sta I_src
|
| 982 |
|
|
I_clr IRQ_bit
|
| 983 |
|
|
ldx irq_x
|
| 984 |
|
|
inx
|
| 985 |
|
|
stx irq_count
|
| 986 |
|
|
lda #'Q' ;mark (IR)Q
|
| 987 |
|
|
plp ;should be reversed by rti
|
| 988 |
|
|
rti
|
| 989 |
|
|
|
| 990 |
|
|
brk_trap
|
| 991 |
|
|
lda I_src ;break expected?
|
| 992 |
|
|
and #1
|
| 993 |
|
|
trap_eq ;unexpected BRK - check stack for conditions
|
| 994 |
|
|
lda I_src ;mark expected BRK has occured
|
| 995 |
|
|
and #$ff-1
|
| 996 |
|
|
sta I_src
|
| 997 |
|
|
ldx irq_x
|
| 998 |
|
|
inx
|
| 999 |
|
|
stx brk_count
|
| 1000 |
|
|
lda irq_a
|
| 1001 |
|
|
lda #'K' ;mark (BR)K
|
| 1002 |
|
|
plp ;should be reversed by rti
|
| 1003 |
|
|
rti
|
| 1004 |
|
|
|
| 1005 |
|
|
if report = 1
|
| 1006 |
|
|
rep_int = 1
|
| 1007 |
|
|
include "report.i65"
|
| 1008 |
|
|
endif
|
| 1009 |
|
|
|
| 1010 |
|
|
|
| 1011 |
|
|
;system vectors
|
| 1012 |
|
|
if (load_data_direct = 1)
|
| 1013 |
|
|
org $fffa
|
| 1014 |
|
|
dw nmi_trap
|
| 1015 |
|
|
; dw res_trap
|
| 1016 |
|
|
dw start
|
| 1017 |
|
|
dw irq_trap
|
| 1018 |
|
|
else
|
| 1019 |
|
|
vec_init
|
| 1020 |
|
|
vec_bss equ $fffa
|
| 1021 |
|
|
dw nmi_trap
|
| 1022 |
|
|
; dw res_trap
|
| 1023 |
|
|
dw start
|
| 1024 |
|
|
dw irq_trap
|
| 1025 |
|
|
endif
|
| 1026 |
|
|
|
| 1027 |
|
|
end start
|
| 1028 |
|
|
|
| 1029 |
|
|
|
