mirror of
https://github.com/hsoft/collapseos.git
synced 2024-11-10 02:38:05 +11:00
f9ae5ca46b
It always reads in the scratchpad with the same max size. No need for DE-dancing anymore.
80 lines
1.3 KiB
NASM
80 lines
1.3 KiB
NASM
#include "user.inc"
|
|
|
|
; *** Code ***
|
|
.org USER_CODE
|
|
|
|
; Parse asm file in (HL) and outputs its upcodes in (DE). Returns the number
|
|
; of bytes written in C.
|
|
main:
|
|
ld bc, 0 ; C is our written bytes counter
|
|
.loop:
|
|
call parseLine
|
|
jr nz, .stop
|
|
ld a, c
|
|
add a, ixl
|
|
ld c, a
|
|
call gotoNextLine
|
|
jr nz, .stop ; error? stop
|
|
jr .loop
|
|
.stop:
|
|
ret
|
|
|
|
#include "util.asm"
|
|
#include "parse.asm"
|
|
#include "literal.asm"
|
|
#include "instr.asm"
|
|
#include "tok.asm"
|
|
#include "directive.asm"
|
|
|
|
; Parse line in (HL), write the resulting opcode(s) in (DE) and returns the
|
|
; number of written bytes in IXL. Advances HL where tokenization stopped and DE
|
|
; to where we should write the next upcode.
|
|
; Sets Z if parse was successful, unset if there was an error or EOF.
|
|
parseLine:
|
|
push bc
|
|
|
|
call gotoNextNotBlankLine
|
|
jr nz, .error
|
|
call tokenize
|
|
ld a, b ; TOK_*
|
|
cp TOK_INSTR
|
|
jr z, .instr
|
|
cp TOK_DIRECTIVE
|
|
jr z, .direc
|
|
jr .error ; token not supported
|
|
.instr:
|
|
ld a, c ; I_*
|
|
call parseInstruction
|
|
or a ; is zero?
|
|
jr z, .error
|
|
ld b, 0
|
|
ld c, a ; written bytes
|
|
push hl
|
|
ld hl, instrUpcode
|
|
call copy
|
|
pop hl
|
|
call JUMP_ADDDE
|
|
jr .success
|
|
.direc:
|
|
ld a, c ; D_*
|
|
call parseDirective
|
|
ld b, 0
|
|
ld c, a ; written bytes
|
|
push hl
|
|
ld hl, direcData
|
|
call copy
|
|
pop hl
|
|
call JUMP_ADDDE
|
|
jr .success
|
|
.success:
|
|
ld ixl, a
|
|
xor a ; ensure Z
|
|
jr .end
|
|
.error:
|
|
xor ixl
|
|
call JUMP_UNSETZ
|
|
.end:
|
|
pop bc
|
|
ret
|
|
|