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stm8_asm.asm
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stm8_asm.asm
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;;
; Copyright Jacques Deschênes 2023,24
; This file is part of pomme-1
;
; pomme-1 is free software: you can redistribute it and/or modify
; it under the terms of the GNU General Public License as published by
; the Free Software Foundation, either version 3 of the License, or
; (at your option) any later version.
;
; pomme-1 is distributed in the hope that it will be useful,
; but WITHOUT ANY WARRANTY; without even the implied warranty of
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
; GNU General Public License for more details.
;
; You should have received a copy of the GNU General Public License
; along with pomme-1. If not, see <http://www.gnu.org/licenses/>.
;;
;------------------------------
; variables used by assembler
;------------------------------
TOKEN= dasm_flags+1 ; *token
TOK_LEN=TOKEN+2 ; lenght of token
;--------------------------------
; simple embeded assembler
; for STM8 core
; tokens separated by SPACE and ,
;--------------------------------
ASM_ADR=1
TOK_ADR=ASM_ADR+2
TOK_LEN=TOK_ADR+2
TOK_LINK=TOK_LEN+1
VSIZE=TOK_LINK+2
stm8asm:
_vars VSIZE
1$:
clr a
call readln
call mnemonic
tnz a
jreq 1$
call search_mnemonic
tnz a
jreq 8$
call (y) ; coder function
8$: ; not a valid token
ldw x,#BAD_TOKEN
call puts
9$:
_drop VSIZE
ret
BAD_TOKEN: .asciz "Unkown token, exiting\n"
;----------------------------------
; skip character
; input:
; A character to skip
; X text buffer
; output:
; X update after last char
;--------------------------------
skip:
cp a,(x)
jrne 9$
incw x
jra skip
9$:
_strxz TOKEN
ret
skip_space:
ld a,#SPACE
jra skip
;------------------------------
; scan up to this character
; input:
; A character
; X text buffer
; output:
; A count
; X *first token char
;-------------------------------
scan:
pushw x
push #0
1$:
cp a,(x)
jreq 9$
incw x
inc (1,sp)
jra 1$
9$: pop a
_straz TOK_LEN
popw x
ret
;----------------------------
; extract mnemonic
; input:
; X *input_line
; output:
; A token length
; X *token
;----------------------------
mnemonic:
call skip_space
call scan
ret
;------------------------
; search mnemonic in
; scanning mnemo_index
; array and comparing string
; input:
; A token length
; X *token
; output:
;
;-----------------------------
PTOK=1
PIDX=PTOK+2
CNTR=PIDX+1
TLEN=CNTR+1
VSIZE=TLEN
search_mnemonic:
_vars VSIZE
ldw (PTOK,SP),x
ld (TLEN,SP),A
ld a,#1
ld (CNTR,SP),a
ldw x,#mnemo_index+2
ldw (PIDX,SP),X
1$: ld a,(TLEN,SP)
ldw x,(PTOK,SP)
ldw y,(PIDX,sp)
ldw y,(y)
jreq 7$
call cstrcp
jreq 8$
inc (CNTR,sp)
ldw x,(PIDX,SP)
addw x,#2
ldw (PIDX,sp),x
jra 1$
7$: clr a
jra 9$
8$: ; found
ld a,(CNTR,SP)
9$:
_drop VSIZE
ret
syn_error: .asciz " syntax error\n"
syntax_error:
ldw x,#syn_error
call puts
ldw x,#RAM_SIZE-1
ldw sp,x
jp GETLINE
;-----------------------
; next token must be a
; followed by ','
;-----------------------
expect_A:
call skip_space
_strxz TOKEN
ld a,(X)
and a,#0xDF
cp a,#'A
jreq 9$
jra syntax_error
9$: incw x
_strxz TOKEN
ret
;-----------------------
; next token must be
; ','
;------------------------
expect_comma:
call skip_space
ld a,(x)
cp a,#',
jrne syntax_error
incw x
_strxz TOKEN
ret
;---------------------
; skip over last token
; output:
; X *tib[n]
;----------------------
skip_over:
_ldxz TOKEN
push TOK_LEN
push #0
addw x,(1,sp)
_strxz TOKEN
_clrz TOK_LEN
_drop 2
ret
;---------------------
; parse hexadecimal
; number
; output:
; X value
;---------------------
HDIGIT=1
VSIZE=2
parse_number:
_vars VSIZE
call skip_space
ld a,(x)
cp a,#'$
jrne syntax_error
incw x
clrw y
1$: ld a,(X)
cp a,#'a
jrmi 2$
cp a,#'z+1
jrpl 2$
and a,#0XDF
2$:
cp a,#'A
jrmi 3$
sub a,#7
3$:
cp a,#'0
jrmi 9$
sub a,#'0
cp a,#16
jrpl 9$
sllw y
sllw y
sllw y
sllw y
push a
push #0
addw y,(1,sp)
9$: _strxz TOKEN
ldw x,y
_drop VSIZE
ret
;---------------------
; code arithmetic
; and logic operation
; on A
; OP A,....
;---------------------
IDX_OP=1 ; operation index
PRE=IDX_OP+1 ; precode
CODE=PRE+1 ; machine code
ADR=CODE+1 ; address
VSIZE=ADR+1
alu8_func:
_vars VSIZE
ld (IDX_OP,SP),a
clr (PRE,sp)
call skip_over ; last token
call expect_A
call expect_comma
call skip_space
ld a,(x)
incw x
_strxz TOKEN
cp a,#'# ; immediate
jreq 2$
cp a,#'$ ; direct
jreq 4$
cp a,#'( ; indexed
jreq 6$
cp a,#'[ ; pointer
jreq 8$
2$: immediate value
call parse_number
_drop VSIZE
ret
;--------------------------
; compare counted strings
; input:
; A length
; X str1
; Y str2
; output:
; Z 1 == | 0 !=
; A not changed
; X not changed
; Y not changed
;--------------------------
cstrcp:
pushw y
pushw x
push a
push a
1$: ld a,(x)
cp a,(y)
jrne 9$
dec (1,sp)
jrne 1$
9$: _drop 1
pop a
popw x
popw y
ret
;----------------------------
; coder functions
; table
;----------------------------
coder_funcs:
.word 0 ;
.word alu8_func ; ADC
.word alu8_func ; ADD
.word alu16_func ; ADDW
.word alu8_func ; AND
.word bccm_func ; BCCM
.word alu8_func ; BCP
.word bit_func ; BCPL
.word break_func ; BREAK
.word bit_func ; BRES
.word bit_func ; BSET
.word bit_func ; BTJF
.word bit_func ; BTJT
.word call_func ; CALL
.word callf_func ; CALLF
.word callr_func ; CALLR
.word flags_func ; CCF
.word al8am_func ; CLR
.word clrw_func ; CLRW
.word al8am_func ; CP
.word alu16_func ; CPW
.word alu8_func ; CPL
.word alu16_func ; CPLW
.word al8am_func ; DEC
.word alu16_func ; DECW
.word div_func ; DIV
.word divw_func ; DIVW
.word reg8_func ; EXG
.word reg16_func ; EXGW
.word halt_func ; HALT
.word al8am_func ; INC
.word alu16_func ; INCW
.word int_func ; INT
.word iret_func ; IRET
.word jp_func ; JP
.word jpf_func ; JPF
.word jr_func ; JRA
.word jr_func ; JRC
.word jr_func ; JREQ
.word jr_func ; JRF
.word jr_func ; JRH
.word jr_func ; JRIH
.word jr_func ; JRIL
.word jr_func ; JRM
.word jr_func ; JRMI
.word jr_func ; JRNC
.word jr_func ; JRNE
.word jr_func ; JRNH
.word jr_func ; JRNM
.word jr_func ; JRNV
.word jr_func ; JRPL
.word jr_func ; JRSGE
.word jr_func ; JRSGT
.word jr_func ; JRSLE
.word jr_func ; JRSLT
.word jr_func ; JRT
.word jr_func ; JRUGE
.word jr_func ; JRUGT
.word jr_func ; JRULE
.word jr_func ; JRULT
.word jr_func ; JRV
.word ld_func ; LD
.word ldf_func ; LDF
.word ldw_func ; LDW
.word mov_func ; MOV
.word mul_func ; MUL
.word al8am_func ; NEG
.word alu16_func ; NEGW
.word nop_func ; NOP
.word alu8_func ; OR
.word stack_func ; POP
.word stack_func ; POPW
.word stack_func ; PUSH
.word stack_func ; PUSHW
.word flags_func ; RCF
.word ret_func ; RET
.word retf_func ; RETF
.word flags_func ; RIM
.word al8am_func ; RLC
.word alu16_func ; RLCW
.word alu16_func ; RLWA
.word al8am_func ; RRC
.word alu16_func ; RRCW
.word alu16_func ; RRWA
.word flags_func ; RVF
.word alu8_func ; SBC
.word flags_func ; SCF
.word flags_func ; SIM
.word al8am_func ; SLA
.word al8am_func ; SLL
.word alu16_func ; SLAW
.word alu16_func ; SLLW
.word al8am_func ; SRA
.word alu16_func ; SRAW
.word al8am_func ; SRL
.word alu16_func ; SRLW
.word alu8_func ; SUB
.word alu16_func ; SUBW
.word al8am_func ; SWAP
.word alu16_func ; SWAPW
.word al8am_func ; TNZ
.word alu16_func ; TNZW
.word trap_func ; TRAP
.word wfe_func ; WFE
.word wfi_func ; WFI
.word alu8_func ; XOR
.word 0