82 lines
1.4 KiB
NASM
82 lines
1.4 KiB
NASM
#include "user.inc"
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; *** Code ***
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.org USER_CODE
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; Parse asm file in (HL) and outputs its upcodes in (DE). Returns the number
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; of bytes written in C.
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main:
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ld bc, 0 ; C is our written bytes counter
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.loop:
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call parseLine
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jr nz, .stop
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ld a, c
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add a, ixl
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ld c, a
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call gotoNextLine
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jr nz, .stop ; error? stop
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jr .loop
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.stop:
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ret
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#include "util.asm"
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#include "literal.asm"
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#include "instr.asm"
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#include "tok.asm"
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#include "directive.asm"
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; Parse line in (HL), write the resulting opcode(s) in (DE) and returns the
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; number of written bytes in IXL. Advances HL where tokenization stopped and DE
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; to where we should write the next upcode.
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; Sets Z if parse was successful, unset if there was an error or EOF.
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parseLine:
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push bc
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call gotoNextNotBlankLine
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jr nz, .error
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call tokenize
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ld a, b ; TOK_*
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cp TOK_INSTR
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jr z, .instr
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cp TOK_DIRECTIVE
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jr z, .direc
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jr .error ; token not supported
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.instr:
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ld a, c ; I_*
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call parseInstruction
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or a ; is zero?
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jr z, .error
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ld b, 0
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ld c, a ; written bytes
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push hl
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ld hl, instrUpcode
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call copy
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pop hl
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call JUMP_ADDDE
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jr .success
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.direc:
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ld a, c ; D_*
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call parseDirective
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ld b, 0
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ld c, a ; written bytes
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push hl
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ld hl, direcData
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call copy
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pop hl
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call JUMP_ADDDE
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jr .success
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.success:
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ld ixl, a
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xor a ; ensure Z
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jr .end
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.error:
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xor ixl
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call JUMP_UNSETZ
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.end:
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pop bc
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ret
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; *** Variables ***
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scratchpad:
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.fill 0x20
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