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z80assembler.asm
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z80assembler.asm
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z80_assemble PROTO :DWORD
z80_getobjectlength PROTO
z80_storeasmbytes PROTO :DWORD,:DWORD
z80_storeasmbyte PROTO :BYTE
z80_storeasmwords PROTO :DWORD,:DWORD
z80_storeasmword PROTO :WORD
z80_fillasmbytes PROTO :DWORD,:BYTE
include z80opcodes.asm
include z80cbopcodes.asm
include z80edopcodes.asm
include z80assembler.inc
.data?
z80_lpDest DWORD ?
z80_lpOriginalDest DWORD ?
.data
.code
; decode arg types
RESETENUM
ENUM z80type_unknown
ENUM z80type_8bitregister, z80type_16bitregister
ENUM z80type_immediate, z80type_bracketimmediate
ENUM z80type_bcdehl_mem, z80type_index_mem, z80type_IR
ENUM z80type_quoted
z80m_decodearg macro arg:req
argtype = z80type_unknown
argstr textequ <>
argitem = 0
argval = 0
argixiy = 0
argconstreg textequ <>
if @ITEMINLIST (arg, <ax,bx,cx,dx,si,di>) ne 0
argtype = z80type_immediate
argstr textequ <arg>
argconstreg textequ <arg>
exitm
endif
if @ITEMINLIST (arg, <al,bl,cl,dl,ah,bh,ch,dh>) ne 0
argtype = z80type_immediate
argstr textequ <arg>
argconstreg textequ <arg>
exitm
endif
if @ITEMINLIST (arg, <b,c,d,e,h,l,a,ixl,ixh,iyl,iyh>) ne 0
; simple 8 bit register
argtype = z80type_8bitregister
argstr textequ <arg>
exitm
endif
if @ITEMINLIST (arg, <bc,de,hl,af,ix,iy,sp>) ne 0
; simple 16 bit register
argtype = z80type_16bitregister
argstr textequ <arg>
exitm
endif
; test for 8 bit load/store to 16 bit register address
argitem = @ITEMINLIST (arg, <(bc),(de),(hl)>)
if argitem ne 0
argtype = z80type_bcdehl_mem
argstr textequ <arg>
argitem = argitem - 1 ; argitem = 0 for (bc), 1 for (de), 2 for (hl)
exitm
endif
; test for "(ix" or "(iy" indexing
if @SizeStr (arg) ge 6 ; (ix+n)
tmparg substr <arg>, 1, 3
tmparg catstr tmparg, <)>
indxmem = @ITEMINLIST (tmparg, <(ix),(iy>))
if indxmem ne 0
if indxmem eq 1
argixiy = 0ddh
else
argixiy = 0fdh
endif
tmpchr substr <arg>, 4, 1 ; = "+" or "-"
tsize sizestr <arg>
tmparg substr <arg>, 5, tsize -5 ; remainder of string from pos 5, beyond "(ix+"
argtype = z80type_index_mem
argval = z80m_get8bit(%tmparg)
ifidn tmpchr, <->
argval = -argval
endif
exitm
endif
endif
; test for I, R argument
argitem = @ITEMINLIST (arg, <I,R>)
if argitem ne 0
argtype = z80type_IR
argstr textequ <arg>
argitem = argitem - 1 ; argitem = 0 for I, 1 for R
exitm
endif
; test for "(immediate)" as in 16 bit register load/store from memory
tsize sizestr <arg>
tmpchr substr <arg>, 1, 1
ifidn tmpchr, <(>
tmpchr substr <arg>, tsize, 1
ifidn tmpchr, <)>
argtype = z80type_bracketimmediate
argstr substr <arg>, 2, tsize-2 ; unbracket immediate value
; test to see if immediate value is an x86 reg const
if @ITEMINLIST (argstr, <ax,bx,cx,dx,si,di,al,bl,cl,dl,ah,bh,ch,dh>) ne 0
argconstreg textequ <argstr>
else
argval = z80m_get16bit(%argstr)
endif
exitm
endif
endif
; test for quoted string
tsize sizestr <arg>
tmpchr substr <arg>, 1, 1
ifidn tmpchr, <">
tmpchr substr <arg>, tsize, 1
ifidn tmpchr, <">
argtype = z80type_quoted
argstr textequ <arg> ; we don't strip quotes from quoted text
exitm
endif
endif
; fall back to immediate argument
argtype = z80type_immediate
argstr textequ <arg>
argval = z80m_get16bit(arg)
endm
z80m_decode_dest_src macro arg1:req, arg2:req
z80m_decodearg arg1
arg1type = argtype
arg1str textequ <argstr>
arg1item = argitem
arg1val = argval
arg1ixiy = argixiy
arg1constreg textequ <argconstreg>
z80m_decodearg arg2
arg2type = argtype
arg2str textequ <argstr>
arg2item = argitem
arg2val = argval
arg2ixiy = argixiy
arg2constreg textequ <argconstreg>
endm
; ********************* support macros *********************
z80_ds macro count:req, val:=<0>
local cnt, cnttxt
cnt = z80m_get16bit (count)
; cnttxt textequ %cnt
; if emitz80
; %echo DS Count: cnttxt
; endif
if cnt lt 0
.err <*** DS Count < 0 ***>
exitm
endif
if cnt gt 0
z80_PC = z80_PC + cnt
if emitz80
invoke z80_fillasmbytes, cnt, val
endif
endif
endm
z80_db macro arg8:VARARG
local @db8
.data
@db8 db arg8
.code
t_tmp = sizeof @db8
if t_tmp gt 0
if emitz80
invoke z80_storeasmbytes, addr @db8, t_tmp
endif
z80_PC = z80_PC + t_tmp
endif
endm
z80_dw macro arg16:VARARG
local @db16
.data
@db16 dw arg16
.code
t_tmp = sizeof @db16/2
if t_tmp gt 0
if emitz80
invoke z80_storeasmwords, addr @db16, t_tmp
endif
z80_PC = z80_PC + (t_tmp * 2)
endif
endm
z80_defb macro args:vararg
for @param, <args>
z80_label @param
z80m_storebyte 0
z80_PC = z80_PC + 1
endm
endm
z80_defw macro args:vararg
for @param, <args>
z80_label @param
z80m_storeword 0
z80_PC = z80_PC + 2
endm
endm
z80_setloop macro loopreps:REQ
z80HighLoopLab textequ %(z80HighLoopLab + 1)
z80LoopLab textequ <z80HighLoopLab>
z80 push hl
z80 ld hl,loopreps
%z80 z80loop&z80LoopLab&:
z80 ex (sp),hl
endm
z80_endloop macro
z80 ex (sp),hl
z80 dec l
z80 jp nz,z80loop&z80LoopLab&
z80 dec h
z80 jp p,z80loop&z80LoopLab&
%z80 z80extloop&z80LoopLab&:
z80 inc sp
z80 inc sp
z80LoopLab textequ %(z80LoopLab - 1)
endm
z80_breakloop macro
z80 jp z80extloop&z80LoopLab&
endm
z80_label macro newlab:req
local intname, labaddr, labelname
intname textequ <newlab>
%ifidn <intname>, <@@>
ifndef localsym_curr
localsym_curr = 0
endif
localsym_curr = localsym_curr + 1
intname textequ %localsym_curr
intname catstr <localsym>, %intname
endif
%labelname catstr <z80lab_>, <intname>
%labelname = z80_PC
labaddr textequ %z80_PC
; list label names on final pass
if emitz80
; %echo Label: labelname labaddr
endif
endm
z80m_get16bit macro z80arg16:req
local locallab, temp
if pass ge 2
ifidni <z80arg16>, <@F>
temp textequ %(localsym_curr + 1)
%locallab catstr <z80lab_>, <localsym>, <temp>
exitm %locallab
elseifidni <z80arg16>, <@B>
temp textequ %localsym_curr
%locallab catstr <z80lab_>, <localsym>, <temp>
exitm %locallab
endif
ifdef z80lab_&z80arg16&
exitm %z80lab_&z80arg16&
else
temp catstr <0+>, <z80arg16>
exitm %temp and 65535
endif
else
exitm %0
endif
endm
z80m_get8bit macro z80arg8:req
local temp
temp = z80m_get16bit (z80arg8)
exitm %temp and 255
endm
z80m_getrelativedisp macro z80arg8:req
local target, disp, txt1, txt2
if emitz80
target = z80m_get16bit (z80arg8)
if target lt z80_PC
disp = (target - z80_PC) and 255
if disp lt 80h
.err <*** Backwards relative displacement out of range ***>
exitm %0
endif
else
disp = target - z80_PC
if disp gt 7Fh
.err <*** Forwards relative displacement out of range ***>
exitm %0
endif
endif
exitm %disp
else
exitm %0
endif
endm
z80_org macro z80org:req
z80_PC = z80org
endm
z80_crt macro z80crt:VARARG
local string
t_count = argcount (z80crt)
if t_count eq 0
exitm
endif
for @param, <z80crt>
%z80m_decodearg @param
if argtype eq z80type_immediate
z80 ld a,%argval
z80 rst 16
elseif argtype eq z80type_8bitregister
z80_crt8 %argstr
elseif argtype eq z80type_16bitregister
z80_crt16 %argstr
elseif argtype eq z80type_quoted
string textequ <argstr>
string substr string, 2, tsize-2 ; unquote the quoted string
%tsize sizestr <string>
if tsize le 4
%forc $char, <string>
if emitz80
mov al,"&$char&"
endif
z80 ld a,al
z80 rst 16
endm
else
z80_crtquoted %argstr
endif
endif
endm
endm
z80_crtquoted macro z80quoted:req
if _z80includecrt_ eq 0
_z80includecrt_ = 1
z80 jr _z80crtskip_
z80 _z80crtprt_: ld a,(de)
z80 cp 255
z80 ret z
z80 rst 16
z80 inc de
z80 jr _z80crtprt_
z80 _z80crtskip_:
endif
_z80crtptrcount_ = _z80crtptrcount_ + 1
_localcrt1_ catstr <_z80crtlabel_>, %_z80crtptrcount_
_localcrt2_ catstr <_z80crtexit_>, %_z80crtptrcount_
z80 jp _localcrt2_
z80 _localcrt1_: db z80quoted ;z80crt
z80 db 255
z80 _localcrt2_:
z80 push de
z80 ld de,_localcrt1_
z80 call _z80crtprt_
z80 pop de
endm
z80_crtnum macro
if _z80includecrtnum_ eq 0
_z80includecrtnum_ = 1
z80 jr _z80crtnumskip_
z80 _z80crtnumdigit_: ld a,"0"-1
z80 _z80crtnumdig_loop_: inc a
z80 add hl,bc
z80 jr c,_z80crtnumdig_loop_
z80 sbc hl,bc
z80 cp d ;"0"?
z80 jr nz,_z80crtnumnonzero_
z80 bit 0,e
z80 ret z
z80 _z80crtnumnonzero_: rst 16
z80 set 0,e
z80 ret
z80 _z80crtnum16_: push af
z80 push bc
z80 push de
z80 ld de,("0" shl 8) or 0
z80 ld bc,65536-10000
z80 call _z80crtnumdigit_
z80 ld bc,65536-1000
z80 call _z80crtnumdigit_
z80 jr _z80crtnum8_1_
z80 _z80crtnum8_: push af
z80 push bc
z80 push de
z80 ld de,("0" shl 8) or 0
z80 _z80crtnum8_1_: ld bc,65536-100
z80 call _z80crtnumdigit_
z80 ld bc,65536-10
z80 call _z80crtnumdigit_
z80 ld a,d ;"0"
z80 add a,l
z80 rst 16
z80 pop de
z80 pop bc
z80 pop af
z80 ret
z80 _z80crtnumskip_:
endif
endm
z80_crthex macro
if _z80includecrthex_ eq 0
_z80includecrthex_ = 1
z80 jr _z80crthexskip_
z80 _z80crthex16_: ld a,h
z80 call _z80crthex8_1
z80 _z80crthex8_: ld a,l
z80 _z80crthex8_1: push af
z80 rra
z80 rra
z80 rra
z80 rra
z80 call _z80crthexdigit_
z80 pop af
z80 _z80crthexdigit_: and 15
z80 cp 10
z80 sbc a,69h
z80 daa
z80 rst 16
z80 ret
z80 _z80crthexskip_:
endif
endm
z80_crt16 macro arg16:req, ashex:=<0>
z80_crtnum
z80 push hl
if @ITEMINLIST (arg16, <af,bc,de,ix,iy>) ne 0
z80 push arg16
z80 pop hl
elseifidni <arg16>, <sp>
z80 ld hl,2 ; +2 to account for the PUSH HL
z80 add hl,sp
elseifidni <arg16>, <hl>
; do nothing for hl arg
else
z80 ld hl,arg16
endif
if ashex eq 1
z80 call _z80crthex16_
else
z80 call _z80crtnum16_
endif
z80 pop hl
endm
z80_crt8 macro arg8:req, ashex:=<0>
z80_crtnum
z80 push hl
t_tmp = @ITEMINLIST (arg8, <a,b,c,d,e,h,l,ixl,ixh,iyl,iyh>)
if t_tmp ne 0
t_tmp = t_tmp - 1
if t_tmp le 6
; a - l
; we only move 'arg8' to L if it isn't L, cos LD L,L would be dumb
ifdifi <arg8>, <l>
z80 ld l,arg8
endif
z80 ld h,0
else
; ixl,ixh,iyl,iyh
z80 push af
z80 ld a,arg8
z80 ld l,a
z80 ld h,0
z80 pop af
endif
else
; immediate arg
z80 ld hl,arg8
endif
if ashex eq 1
z80 call _z80crthex8_
else
z80 call _z80crtnum8_
endif
z80 pop hl
endm
z80_crthex8 macro arg8:req
z80_crthex
z80_crt8 arg8, 1
endm
z80_crthex16 macro arg8:req
z80_crthex
z80_crt16 arg8, 1
endm
z80_for macro LCV:req, args:VARARG
t_count = argcount (args)
if t_count lt 2
.err <*** Not enough FOR arguments ***>
exitm
endif
Start textequ <getarg (1, args)>
Stop textequ <getarg (2, args)>
ifndef $$z80For&LCV&
$$z80For&LCV& = 0
else
$$z80For&LCV& = $$z80For&LCV& + 1
endif
ForLoop catstr <_$For&LCV&_>, %$$z80For&LCV&
NextLbl catstr <_$Next&LCV&_>, %$$z80For&LCV&
z80 push hl
z80 ld hl,Start
%z80 &ForLoop&:
z80 ld (LCV),hl
z80 push de
z80 ld de,Stop + 1
z80 or a
z80 sbc hl,de
z80 pop de
z80 pop hl
z80 jp nc,NextLbl
endm
z80_next macro LCV:req
ForLoop catstr <_$For&LCV&_>, %$$z80For&LCV&
NextLbl catstr <_$Next&LCV&_>, %$$z80For&LCV&
z80 push hl
z80 ld hl,(LCV)
z80 inc hl
z80 jp ForLoop
%z80 &NextLbl&:
endm
z80_align macro alignsize:req
$$align = ((z80_PC + (alignsize - 1)) and not (alignsize - 1)) - z80_PC
if $$align gt 0
z80 ds $$align, 0
endif
endm
z80_breakpoint macro
invoke AddBreakpoint, z80_PC
endm
z80_fillmem macro pMem:req, args:vararg
t_count = argcount (args)
if t_count lt 1
.err <*** Not enough MEMFILL arguments ***>
exitm
endif
bcount textequ <getarg (1, args)>
if t_count ge 2
fbyte textequ <getarg (2, args)>
ifdifi <fbyte>, <a>
z80 ld a,fbyte
endif
else
z80 xor a ; if no filler byte specified, use 0 for filler
endif
if bcount eq 0
exitm
endif
if _z80includefillmem_ eq 0
_z80includefillmem_ = 1
z80 jr _z80fillmemskip_
z80 _z80fillmem_: inc b
z80 _z80fillmemloop_: ld (hl),a
z80 inc hl
z80 dec c
z80 jp nz,_z80fillmemloop_
z80 djnz _z80fillmemloop_
z80 ret
z80 _z80fillmemskip_:
endif
z80 push hl
z80 push bc
z80 ld hl,pMem
z80 ld bc,bcount
z80 call _z80fillmem_
z80 pop bc
z80 pop hl
endm
z80 macro mnarg, args:VARARG
oparg textequ <>
arg textequ <>
t_label textequ <>
mnemonic textequ <mnarg>
ifb <mnarg>
exitm
endif
newlab = 0
t_tmp = 1
% forc $char, <mnemonic>
ifidn <$char>, < >
exitm
endif
ifidn <$char>, <:>
z80_label %t_label ; create the new label
newlab = 1
exitm
else
t_label catstr t_label, <$char>
t_tmp = t_tmp + 1
endif
endm
if newlab eq 1
if @SizeStr (%mnemonic) lt (t_tmp+1)
exitm ; nothing after colon, so only a label on this line
endif
mnemonic substr mnemonic, t_tmp+1 ; strip label name from mnemonic argument
endif
t_tmp = 0
t_leadspc = 0
t_quoted = 0
% forc $char, <mnemonic>
t_addchar = 0
ifidn <$char>, <!">
; we add the opening or closing quote, then toggle quoted flag
t_addchar = 1
t_quoted = not t_quoted
endif
ifidn <$char>, < >
if t_leadspc eq 1
t_tmp = 1
endif
else
t_leadspc = 1
t_addchar = 1
endif
if (t_addchar eq 1) or t_quoted
if t_tmp eq 0
oparg catstr oparg, <$char>
else
arg catstr arg, <$char>
endif
endif
endm
ifidni oparg, <ld>
%z80_ld <arg>, <args>
exitm
endif
ifidni oparg, <call>
%z80_call <arg>, <args>
exitm
endif
ifidni oparg, <ret>
%z80_ret <arg>
exitm
endif
ifidni oparg, <djnz>
%z80_djnz <arg>
exitm
endif
ifidni oparg, <jr>
%z80_jr <arg>, <args>
exitm
endif
ifidni oparg, <jp>
%z80_jp <arg>, <args>
exitm
endif
ifidni oparg, <push>
%z80_push <arg>
exitm
endif
ifidni oparg, <pop>
%z80_pop <arg>
exitm
endif
ifidni oparg, <inc>
%z80_inc <arg>
exitm
endif
ifidni oparg, <dec>
%z80_dec <arg>
exitm
endif
ifidni oparg, <add>
%z80_add <arg>, <args>
exitm
endif
ifidni oparg, <adc>
%z80_adc <arg>, <args>
exitm
endif
ifidni oparg, <sub>
%z80_sub <arg>
exitm
endif
ifidni oparg, <sbc>
%z80_sbc <arg>, <args>
exitm
endif
ifidni oparg, <and>
%z80_and <arg>
exitm
endif
ifidni oparg, <xor>
%z80_xor <arg>
exitm
endif
ifidni oparg, <or>
%z80_or <arg>
exitm
endif
ifidni oparg, <cp>
%z80_cp <arg>
exitm
endif
ifidni oparg, <ex>
%z80_ex <arg>, <args>
exitm
endif
ifidni oparg, <rla>
z80_rla
exitm
endif
ifidni oparg, <rra>
z80_rra
exitm
endif
ifidni oparg, <rlca>
z80_rlca
exitm
endif
ifidni oparg, <rrca>
z80_rrca
exitm
endif
ifidni oparg, <daa>
z80_daa
exitm
endif
ifidni oparg, <cpl>
z80_cpl
exitm
endif
ifidni oparg, <scf>
z80_scf
exitm
endif
ifidni oparg, <ccf>
z80_ccf
exitm
endif
ifidni oparg, <rlc>
%z80_rlc <arg>
exitm
endif
ifidni oparg, <rrc>
%z80_rrc <arg>
exitm
endif
ifidni oparg, <rl>
%z80_rl <arg>
exitm
endif
ifidni oparg, <rr>
%z80_rr <arg>
exitm
endif
ifidni oparg, <sla>
%z80_sla <arg>
exitm
endif
ifidni oparg, <sra>
%z80_sra <arg>
exitm
endif
ifidni oparg, <sll>
%z80_sll <arg>
exitm
endif
ifidni oparg, <sls> ; pseudonym for SLL
%z80_sls <arg>
exitm
endif
ifidni oparg, <srl>
%z80_srl <arg>
exitm
endif
ifidni oparg, <bit>
%z80_bit <arg>, <args>
exitm
endif
ifidni oparg, <res>
%z80_res <arg>, <args>
exitm
endif
ifidni oparg, <set>
%z80_set <arg>, <args>
exitm
endif
ifidni oparg, <ldi>
z80_ldi
exitm
endif
ifidni oparg, <cpi>
z80_cpi
exitm
endif
ifidni oparg, <ini>
z80_ini
exitm
endif
ifidni oparg, <outi>
z80_outi
exitm
endif
ifidni oparg, <ldd>
z80_ldd
exitm
endif
ifidni oparg, <cpd>
z80_cpd
exitm
endif
ifidni oparg, <ind>
z80_ind
exitm
endif
ifidni oparg, <outd>
z80_outd
exitm
endif
ifidni oparg, <ldir>
z80_ldir
exitm
endif
ifidni oparg, <cpir>
z80_cpir