mirror of
https://github.com/a2-4am/4cade.git
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323 lines
6.7 KiB
Plaintext
Executable File
323 lines
6.7 KiB
Plaintext
Executable File
;license:MIT
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;(c) 2018-2020 by 4am
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;
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; common assembler macros (6502 compatible)
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;
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; for functions that take parameters on the stack
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; set (PARAM) to point to the parameters and
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; move the stack pointer to the first byte after the parameters
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; clobbers A,X,Y
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!macro PARAMS_ON_STACK .bytes {
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pla
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sta PARAM
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clc
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adc #.bytes
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tay
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pla
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sta PARAM+1
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adc #0
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pha
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tya
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pha
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}
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; for functions that take parameters on the stack
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; load a 16-bit value from the parameters on the stack into A (low) and Y (high)
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; (assumes PARAMS_ON_STACK was used first)
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!macro LDPARAM .offset {
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ldy #.offset
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lda (PARAM),y
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pha
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iny
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lda (PARAM),y
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tay
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pla
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}
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; for functions that take parameters on the stack
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; load a 16-bit value from the parameters on the stack into A (low) and Y (high)
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; then store it as new source
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; (assumes PARAMS_ON_STACK was used first)
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!macro LDPARAMPTR .offset,.dest {
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ldy #.offset
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lda (PARAM),y
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sta .dest
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iny
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lda (PARAM),y
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sta .dest+1
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}
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; load the address of .ptr into A (low) and Y (high)
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!macro LDADDR .ptr {
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lda #<.ptr
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ldy #>.ptr
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}
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; load a 16-bit value into A (low) and Y (high)
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!macro LD16 .ptr {
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lda .ptr
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ldy .ptr+1
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}
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; store a 16-bit value from A (low) and Y (high)
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!macro ST16 .ptr {
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sta .ptr
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sty .ptr+1
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}
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; decrement a 16-bit value in A (low) and Y (high)
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!macro DEC16 {
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sec
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sbc #1
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bcs +
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dey
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+
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}
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; increment a 16-bit value in A (low) and Y (high)
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!macro INC16 {
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clc
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adc #1
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bne +
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iny
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+
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}
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; compare a 16-bit value in A (low) and Y (high) to an absolute address
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!macro CMP16ADDR .addr {
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cmp .addr
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bne +
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cpy .addr+1
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+
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}
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; compare a 16-bit value in A (low) and Y (high) to an immediate value
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!macro CMP16 .val {
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cmp #<.val
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bne +
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cpy #>.val
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+
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}
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!macro LBPL .target {
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bmi +
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jmp .target
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+
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}
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!macro LBNE .target {
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beq +
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jmp .target
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+
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}
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!macro LBCS .target {
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bcc +
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jmp .target
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+
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}
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; use BIT to swallow the following 1-byte opcode
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!macro HIDE_NEXT_BYTE {
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!byte $24
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}
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; use BIT to swallow the following 2-byte opcode
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!macro HIDE_NEXT_2_BYTES {
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!byte $2C
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}
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; debugging
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!macro DEBUGWAIT {
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bit $c010
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- bit $c000
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bpl -
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bit $c010
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}
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; various language card configurations
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!macro READ_RAM1_NO_WRITE {
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bit $C088
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}
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!macro READ_RAM1_WRITE_RAM1 {
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bit $C08B
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bit $C08B
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}
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!macro READ_RAM2_NO_WRITE {
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bit $C080
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}
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!macro READ_RAM2_WRITE_RAM2 {
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bit $C083
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bit $C083
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}
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!macro READ_ROM_WRITE_RAM1 {
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bit $C089
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bit $C089
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}
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!macro READ_ROM_WRITE_RAM2 {
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bit $C081
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bit $C081
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}
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!macro READ_ROM_NO_WRITE {
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bit $C082
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}
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!macro LOW_ASCII_TO_LOWER {
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cmp #$41
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bcc +
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cmp #$5B
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bcs +
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ora #$20
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+
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}
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; requires setting zpCharMask in zero page to #$FF or #$DF before use
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!macro FORCE_UPPERCASE_IF_REQUIRED {
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cmp #$E1
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bcc +
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and zpCharMask
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+
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}
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!macro HGR_BYTE_TO_DHGR_BYTES {
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;1GFEDCBA ->
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;1GGFFEED (main) +
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;1DCCBBAA (aux)
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;
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; in: A = HGR byte
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; out: A = DHGR byte in mainmem
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; X = DHGR byte in auxmem
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; preserves Y
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; clobbers zero page $00,$01,$02
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sty $02
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ldy #$02
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-- stx $01
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ldx #$04
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- ror $00 ; duplicate previous bit
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lsr ; fetch bit
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php
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ror $00 ; insert bit
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plp
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dex
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bne -
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ldx $00
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dey
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bne --
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txa
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sec
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ror $01 ; set bit 7 explicitly on auxmem value
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ldx $01
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ldy $02
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}
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; these are mostly for prelaunchers -- code in the main program should keep track of which bank is active to minimize code size
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!macro ENABLE_ACCEL {
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+READ_RAM2_NO_WRITE
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jsr EnableAccelerator
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+READ_ROM_NO_WRITE
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}
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!macro DISABLE_ACCEL {
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+READ_RAM2_NO_WRITE
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jsr DisableAccelerator
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+READ_ROM_NO_WRITE
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}
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!macro GET_MACHINE_STATUS {
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+READ_RAM2_NO_WRITE
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lda MachineStatus
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+READ_ROM_NO_WRITE
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}
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!macro GET_MOCKINGBOARD_SPEECH { ;carry set if present
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+READ_RAM2_NO_WRITE
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lda MockingboardStuff
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asl
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+READ_ROM_NO_WRITE
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}
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!macro GET_MOCKINGBOARD_SPEECH_AND_MACHINE_STATUS { ;carry set if present
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+READ_RAM2_NO_WRITE
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lda MockingboardStuff
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asl
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lda MachineStatus
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+READ_ROM_NO_WRITE
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}
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!macro GET_MOCKINGBOARD_SLOT { ;carry set if present
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+READ_RAM2_NO_WRITE
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lda MockingboardStuff
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cmp #1
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ora #$C0
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+READ_ROM_NO_WRITE
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}
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!macro GET_MOCKINGBOARD_SLOT_AND_MACHINE_STATUS { ;carry set if present
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+READ_RAM2_NO_WRITE
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lda MockingboardStuff
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cmp #1
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ora #$C0
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tax
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lda MachineStatus
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+READ_ROM_NO_WRITE
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}
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!macro USES_TEXT_PAGE_2 {
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lda ROM_MACHINEID
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cmp #$06
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bne +
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sec
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jsr $FE1F ; check for IIgs
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bcs +
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jsr ROM_TEXT2COPY ; set alternate display mode on IIgs (required for some games)
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cli ; enable VBL interrupts
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+
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}
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!macro RESET_VECTOR .addr {
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lda #<.addr
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sta $3F2
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lda #>.addr
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sta $3F3
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eor #$A5
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sta $3F4
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}
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; for games that clobber $100-$105, the prelaunch code constructs a new reset vector
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; somewhere else and sets its
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!macro NEW_RESET_VECTOR .addr {
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lda #$2C
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sta .addr
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lda #$88
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sta .addr+1
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lda #$C0
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sta .addr+2
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lda #$6C ; JMP ($FFFC) points to 'Reenter'
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sta .addr+3
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lda #$FC
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sta .addr+4
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lda #$FF
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sta .addr+5
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+RESET_VECTOR .addr
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}
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; for 64k games on ][+ which either hang or restart
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; updates reset hook to reboot on ctrl-reset
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!macro LC_REBOOT {
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inc $101 ; (assumes LC is switched in)
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lda #$A6
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sta $104
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lda #$FA
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sta $105 ; update reset hook to reboot
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lda #1
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sta $FFFD
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lsr
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sta $FFFC ; LC reset vector fix
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}
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