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more adaptations to shadowed ZP

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FeralChild64 authored and FeralChild64 committed 2021-01-26 00:03:07 +01:00
1 parent 54146d3b48
commit d9fdb9f963
2 files changed
+79 -83
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src/aliases/,aliases_ram_lowmem_m65.s
+1 -12
View File
@@ -35,18 +35,7 @@
; $400-$57F - reserved for BASIC
; $400-$54F -- UNUSED -- reserved for BASIC
; $558-$57F - reserved for MONITOR
!addr MON_XVEC = $550 ; $550-$551 monitor exit vector
!addr MON_Ix_Mne = $552 ; index to mnemonics table
!addr MON_Op_Mne = $553 ; 3 bytes for mnemonic
!addr MON_Op_Ix = $554 ; type of constant
!addr MON_Op_Len = $555 ; length of operand
!addr MON_Disk_Track = $556 ; logical track 1 -> 255
!addr MON_Disk_Sector = $557 ; logical sector 0 -> 255
!addr MON_DATA = $558 ; $558-$57F 40 bytes, buffer for hunt and filename
; $400-$57F -- UNUSED -- reserved for BASIC
; $580-$5FF - reserved for KERNAL
src/mon_m65/bsmon.s
+78 -71
View File
@@ -7,14 +7,16 @@
!macro NOP { eom } ; ACME does not allow NOP for MEGA65 CPU
; XXX adapt all the addresses/constants!
; Due to shadowing mechanism, we are free to use zeropage addresses $02-$8F
; for any purpose - they won't conflict with BASIC interpreter varaibles
; ********************
; * Register storage *
; ********************
!addr Bank = 2 ; XXX get rid of it!
!addr Bank = 2 ; $00 = C64 address space, $FF = M65 flat address space XXX adapt the implementation
!addr PCH = 3
!addr PCL = 4
!addr SR = 5
@@ -22,46 +24,51 @@
!addr XR = 7
!addr YR = 8
!addr ZR = 9
; *************************************
; * Used direct (zero) page addresses *
; *************************************
!addr BP = 10
!addr SPH = 11
!addr SPL = 12
; following variables overlap with the BASIC floating point area
; $59 - $5d : temporary floating point accumulator
; $5e - $62 : temporary floating point accumulator
; $63 - $69 : primary floating point accumulator
; $6a - $6f : secondary floating point accumulator
; *******************
; * Other variables *
; *******************
; A set of 32 bit variables also used as 32 bit pointer
!addr Long_AC = $59 ; 32 bit accumulator
!addr Long_CT = $5d ; 32 bit counter
!addr Long_PC = $61 ; 32 bit program counter
!addr Long_DA = $65 ; 32 bit data pointer
!addr Long_AC = $10 ; 32 bit accumulator
!addr Long_CT = $14 ; 32 bit counter
!addr Long_PC = $18 ; 32 bit program counter
!addr Long_DA = $1C ; 32 bit data pointer
; Flags are used in BBR BBS instructions
!addr Adr_Flags = $69
!addr Mode_Flags = $6a
!addr Op_Code = $6b
!addr Op_Flag = $6c ; 7: two operands
!addr Adr_Flags = $20
!addr Mode_Flags = $21
!addr Op_Code = $22
!addr Op_Flag = $23 ; 7: two operands
; 6: long branch
; 5: 32 bit address
; 4: Q register
!addr Op_Size = $6d
!addr Dig_Cnt = $6e
!addr Buf_Index = $6f
!addr Op_Size = $24
!addr Dig_Cnt = $25
!addr Buf_Index = $26
!addr MODE_80 = $d7 ; 80 column / 40 volumn flag ; XXX add routine to detect this
!addr MODE_80 = $27 ; 80 column / 40 volumn flag ; XXX add routine to detect this
!addr Disk_Status = $40A ; BCD value of status
!addr Disk_Msg = $410 ; 40 bytes, disk status as text message ; XXX get rid of this buffer
!addr X_Vector = $28 ; monitor exit vector
!addr Ix_Mne = $29 ; index to mnemonics table
!addr Op_Mne = $2A ; 3 bytes for mnemonic
!addr Op_Ix = $2D ; type of constant
!addr Op_Len = $2E ; length of operand
!addr Disk_Track = $2F ; logical track 1 -> 255
!addr Disk_Sector = $30 ; logical sector 0 -> 255
!addr Disk_Status = $31 ; BCD value of status
; $32-$3F - free space, unused for now
!addr Disk_Msg = $40 ; 40 bytes, disk status as text message
!addr Mon_Data = $68 ; 40 bytes, buffer for hunt and filename
; *******
@@ -112,9 +119,9 @@ Mon_Call
LDA #<m65_shadow_BZP
LDX #>m65_shadow_BZP
STA PCL
STA MON_XVEC
STA X_Vector
STX PCH
STX MON_XVEC+1
STX X_Vector+1
; *******
Mon_Start
@@ -294,7 +301,7 @@ Jump_Table
Mon_Exit
; ******
JMP (MON_XVEC)
JMP (X_Vector)
; *******
LAC_To_PC
@@ -749,7 +756,7 @@ Mon_Hunt
CMP #0
LBEQ Mon_Error ; null string
@lpstr STA MON_DATA,Y
@lpstr STA Mon_Data,Y
INY
JSR Get_Char
BEQ @hunt
@@ -759,7 +766,7 @@ Mon_Hunt
@bin JSR Got_LAC
@lpbin LDA Long_AC
STA MON_DATA,Y
STA Mon_Data,Y
INY
JSR Get_LAC
BCS @hunt
@@ -771,7 +778,7 @@ Mon_Hunt
@lpstart LDY #0
@lpins JSR Fetch
CMP MON_DATA,Y
CMP Mon_Data,Y
BNE @next
INY
CPY Long_DA
@@ -800,9 +807,9 @@ Load_Save
; STY FNLEN
; STY FNBANK
; STY IOSTATUS
; LDA #>MON_DATA
; LDA #>Mon_Data
; STA FNADR+1
; LDA #<MON_DATA
; LDA #<Mon_Data
; STA FNADR
; @skip JSR Get_Char ; skip blanks
; LBEQ Mon_Error
@@ -898,8 +905,8 @@ Mon_Assemble
@start LDX #0 ; mne letter counter
STX Long_DA+1 ; clear encoded MNE
STX Op_Flag ; 6:long branch 5:32 bit
STX MON_Op_Ix ; operand byte index
STX MON_Op_Len ; operand length
STX Op_Ix ; operand byte index
STX Op_Len ; operand length
@getin JSR Get_Char
BNE @laba
CPX #0
@@ -914,20 +921,20 @@ Mon_Assemble
BNE @labb ; -> not 2nd. char
CMP #'B'
BNE @labb ; 2nd. char != 'B'
LDZ MON_Op_Mne
LDZ Op_Mne
CPZ #'L'
BNE @labb ; 1st. Char != 'L'
SMB6 Op_Flag ; flag long branch
DEX ; skip 'L'
@labb STA MON_Op_Mne,X ; next mne character
@labb STA Op_Mne,X ; next mne character
INX
CPX #3
BNE @getin
; encode 3 letter mnemonic
@lpenc LDA MON_Op_Mne-1,X
@lpenc LDA Op_Mne-1,X
SEC
SBC #$3f ; offset
LDY #5 ; 5 bit code
@@ -952,7 +959,7 @@ Mon_Assemble
BPL @lpfind
JMP Mon_Error
@found STX MON_Ix_Mne
@found STX Ix_Mne
; find 1st. opcode for this mnemonic
@@ -1000,10 +1007,10 @@ Mon_Assemble
LDA Long_AC+1
BNE @labf ; high byte not zero
DEY ; Y=1 byte operand
@labf LDX MON_Op_Ix ; X = operand value #
@labf LDX Op_Ix ; X = operand value #
TYA ; A = 1:byte or 2:word
STA MON_Op_Len,X ; store operand length
INC MON_Op_Ix ; ++index to operand value
STA Op_Len,X ; store operand length
INC Op_Ix ; ++index to operand value
TXA ; A = current index
BNE @labg ; -> at 2nd. byte
JSR LAC_To_LCT ; Long_CT = 1st. operand
@@ -1046,7 +1053,7 @@ Mon_Assemble
@comma CMP #','
BNE @stack
LDA MON_Op_Ix ; operand value #
LDA Op_Ix ; operand value #
BEQ @error
LDX #4 ; outside comma
LDA Mode_Flags
@@ -1080,7 +1087,7 @@ Mon_Assemble
@rbra CMP #']'
BNE @right
BBR5 Op_Flag,@error
LDA MON_Op_Ix
LDA Op_Ix
LBEQ Mon_Error ; no value
LDA Mode_Flags
CMP #$40 ; (
@@ -1094,7 +1101,7 @@ Mon_Assemble
@right CMP #')'
BNE @X
LDA MON_Op_Ix
LDA Op_Ix
LBEQ Mon_Error ; no value
LDA Mode_Flags
CMP #$40 ; (
@@ -1108,7 +1115,7 @@ Mon_Assemble
@X CMP #'X'
BNE @Y
LDA MON_Op_Ix
LDA Op_Ix
LBEQ Mon_Error
LDA Mode_Flags
CMP #$60
@@ -1122,7 +1129,7 @@ Mon_Assemble
@Y CMP #'Y'
BNE @Z
LDA MON_Op_Ix
LDA Op_Ix
LBEQ Mon_Error
LDA Mode_Flags
CMP #$4c ; ($nn),
@@ -1138,7 +1145,7 @@ Mon_Assemble
@Z CMP #'Z'
LBNE Mon_Error
LDA MON_Op_Ix
LDA Op_Ix
LBEQ Mon_Error
LDA Mode_Flags
CMP #$4c ; $nn,
@@ -1148,8 +1155,8 @@ Mon_Assemble
; BBR BBS RMB SMB two operands
@adjust LDA MON_Ix_Mne
LDX MON_Op_Ix ; # if values
@adjust LDA Ix_Mne
LDX Op_Ix ; # if values
BEQ @match ; -> no operand
DEX
BEQ @one ; -> one operand
@@ -1202,16 +1209,16 @@ Mon_Assemble
@match JSR Mode_Index
@lpmatch JSR Match_Mode
BEQ @okmat
LDA MON_Op_Len
LDA Op_Len
LBEQ Mon_Error
LDA Mode_Flags
LBMI Mon_Error
AND #%00111111
STA Mode_Flags
INC MON_Op_Len
INC Op_Len
JSR Size_To_Mode
BRA @lpmatch
@okmat LDY MON_Op_Len
@okmat LDY Op_Len
TXA
; store instruction bytes
@@ -1329,7 +1336,7 @@ Match_Mode
@next INX ; next opcode
BEQ @error
LDY MNE_Index,X
CPY MON_Ix_Mne ; same mnemonic ?
CPY Ix_Mne ; same mnemonic ?
BEQ @loop ; -> compare again
BRA @next
@@ -1355,7 +1362,7 @@ Mode_Index
Size_To_Mode
; **********
LDA MON_Op_Len
LDA Op_Len
LSR
ROR
ROR
@@ -2235,7 +2242,7 @@ DOS_U ; XXX connect it somehow to command list
LBCC Mon_Error
CMP #'3' ; U2: write
LBCS Mon_Error
STA MON_DATA+1 ; U type
STA Mon_Data+1 ; U type
INC Buf_Index
JSR Get_LAC
LBCS Mon_Error
@@ -2244,12 +2251,12 @@ DOS_U ; XXX connect it somehow to command list
JSR Get_LAC
LBCS Mon_Error
LDA Long_AC
STA MON_Disk_Track
STA Disk_Track
JSR Get_LAC
LBCS Mon_Error
LDA Long_AC
STA MON_Disk_Sector
STA Disk_Sector
JSR Get_LAC
JSR LAC_To_LCT ; Long_CT = sector count
@@ -2257,7 +2264,7 @@ DOS_U ; XXX connect it somehow to command list
JSR Open_Disk_Buffer
@loop LDA MON_DATA+1
@loop LDA Mon_Data+1
LSR
BEQ @write
JSR Find_next_Sector
@@ -2270,7 +2277,7 @@ DOS_U ; XXX connect it somehow to command list
BNE @error
@next JSR Inc_LPC_Page
INC MON_Disk_Sector
INC Disk_Sector
DEW Long_CT
BPL @loop
@@ -2289,8 +2296,8 @@ Find_next_Sector
CMP #$66 ; illegal track or sector
BNE @error ; error
LDA #0
STA MON_Disk_Sector
INC MON_Disk_Track ; try next track
STA Disk_Sector
INC Disk_Track ; try next track
JSR Build_U_String
JSR Send_Disk_Command
JSR Get_Disk_Status
@@ -2328,7 +2335,7 @@ Send_Disk_Command
; ***************
JSR Open_Command_Channel
@loop LDA MON_DATA,Y
@loop LDA Mon_Data,Y
BEQ @end
JSR CIOUT
INY
@@ -2378,16 +2385,16 @@ Set_TS
@100 CMP #100
BCC @10
INC MON_DATA,X
INC Mon_Data,X
SBC #100
BRA @100
@10 CMP #10
BCC @1
INC MON_DATA+1,X
INC Mon_Data+1,X
SBC #10
BRA @10
@1 ORA #'0'
STA MON_DATA+2,X
STA Mon_Data+2,X
RTS
; @[u],U1 mem track startsec [endsec] : read disk sector(s)
@@ -2400,16 +2407,16 @@ Build_U_String
LDX #14
@loop LDA U1,X
STA MON_DATA,X
STA Mon_Data,X
DEX
CPX #2
BCS @loop
LDA #'U'
STA MON_DATA
LDA MON_Disk_Track
STA Mon_Data
LDA Disk_Track
LDX #7
JSR Set_TS
LDA MON_Disk_Sector
LDA Disk_Sector
LDX #11
JMP Set_TS