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avra: add RJMP and RCALL instructions

This commit is contained in:
Virgil Dupras 2019-12-14 12:28:27 -05:00
parent 33c480a5dd
commit fa75f30ffb
3 changed files with 45 additions and 5 deletions

View File

@ -59,8 +59,11 @@ instrNames:
.db "BST", 0
.db "SBRC", 0
.db "SBRS", 0
.equ I_RCALL 42
.db "RCALL", 0
.db "RJMP", 0
; no arg (from here, instrUpMasks2)
.equ I_BREAK 42
.equ I_BREAK 44
.db "BREAK", 0
.db "CLC", 0
.db "CLH", 0
@ -88,7 +91,7 @@ instrNames:
.db "SLEEP", 0
.db "WDR", 0
; Rd(5)
.equ I_ASR 68
.equ I_ASR 70
.db "ASR", 0
.db "COM", 0
.db "DEC", 0
@ -137,6 +140,9 @@ instrUpMasks1:
.db 0b11111010 ; BST
.db 0b11111100 ; SBRC
.db 0b11111110 ; SBRS
; k(12): XXXXkkkk kkkkkkkk
.db 0b11010000 ; RCALL
.db 0b11000000 ; RJMP
; 16-bit constant masks associated with each instruction. In the same order as
; in instrNames
@ -231,8 +237,10 @@ parseInstruction:
jr c, .spitRd5Rr5
cp I_BLD
jr c, .spitRdK8
cp I_BREAK
cp I_RCALL
jr c, .spitRdBit
cp I_BREAK
jr c, .spitK12
cp I_ASR
jr c, .spitNoArg
; spitRd5
@ -242,7 +250,7 @@ parseInstruction:
; continue to .spitNoArg
.spitNoArg:
call .getUp2
jr .spit
jp .spit
.spitRd5Rr5:
call .readR5
@ -275,7 +283,6 @@ parseInstruction:
call readWord
call parseExpr
ret nz
ld a, c
ld a, 0xff
call .IX2A
ret nz
@ -306,6 +313,36 @@ parseInstruction:
call .getUp1
jr .spitMSB
.spitK12:
; Let's deal with the upcode constant before we destroy DE below
call .getUp1
ld b, (hl)
call readWord
call parseExpr
ret nz
push ix \ pop hl
; We're doing the same dance as in .BR. See comments there.
ld de, 0xfff
add hl, de
jp c, unsetZ ; Carry? number is way too high.
ex de, hl
call zasmGetPC ; --> HL
inc hl \ inc hl
ex de, hl
sbc hl, de
jp c, unsetZ ; Carry? error
ld de, 0xfff
sbc hl, de
; We're within bounds! Now, divide by 2
ld a, l
rr h \ rra
; LSB in A, spit
call ioPutB
ld a, h
and 0xf
or b
jp ioPutB
.spit:
; LSB is spit *before* MSB
inc hl

View File

@ -9,3 +9,6 @@ bar:
brbs 6, foo
ori r22, 0x34+4
sbrs r1, 3
rjmp foo
rcall baz
baz:

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