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more cleanup and fixing

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This commit is contained in:
mrdudz
2015-07-12 16:40:52 +02:00
parent 891cb97b2f
commit 9e1d39a409
13 changed files with 159 additions and 268 deletions
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215
libsrc/pce/crt0.s
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@@ -7,37 +7,38 @@
; This must be the *first* file on the linker command line
;
.export _exit
.export __STARTUP__ : absolute = 1 ; Mark as startup
.import initlib, donelib
.import push0, _main, zerobss
.import initheap
.import tmp1,tmp2,tmp3
.export _exit
.export __STARTUP__ : absolute = 1 ; Mark as startup
.import __RAM_START__, __RAM_SIZE__ ; Linker generated
;; .import __SRAM_START__, __SRAM_SIZE__ ; Linker generated
.import __ROM0_START__, __ROM0_SIZE__ ; Linker generated
.import __ROM_START__, __ROM_SIZE__ ; Linker generated
.import __STARTUP_LOAD__,__STARTUP_RUN__, __STARTUP_SIZE__ ; Linker generated
.import __CODE_LOAD__,__CODE_RUN__, __CODE_SIZE__ ; Linker generated
.import __RODATA_LOAD__,__RODATA_RUN__, __RODATA_SIZE__ ; Linker generated
.import __DATA_LOAD__,__DATA_RUN__, __DATA_SIZE__ ; Linker generated
.import __BSS_SIZE__
.import initlib, donelib
.import push0, _main, zerobss
.import initheap
.import tmp1,tmp2,tmp3
.include "pce.inc"
; Linker generated
.import __RAM_START__, __RAM_SIZE__
.import __ROM0_START__, __ROM0_SIZE__
.import __ROM_START__, __ROM_SIZE__
.import __STARTUP_LOAD__,__STARTUP_RUN__, __STARTUP_SIZE__
.import __CODE_LOAD__,__CODE_RUN__, __CODE_SIZE__
.import __RODATA_LOAD__,__RODATA_RUN__, __RODATA_SIZE__
.import __DATA_LOAD__,__DATA_RUN__, __DATA_SIZE__
.import __BSS_SIZE__
.importzp sp
.importzp ptr1,ptr2
.include "pce.inc"
.importzp sp
.importzp ptr1,ptr2
; ------------------------------------------------------------------------
; Create an empty LOWCODE segment to avoid linker warnings
.segment "LOWCODE"
.segment "LOWCODE"
; ------------------------------------------------------------------------
; Place the startup code in a special segment.
.segment "STARTUP"
.segment "STARTUP"
start:
@@ -47,32 +48,32 @@ start:
sei
nop
csh ; set high speed CPU mode
csh ; set high speed CPU mode
nop
cld
nop
; Setup stack and memory mapping
ldx #$FF ; Stack top ($21FF)
ldx #$FF ; Stack top ($21FF)
txs
; at startup all MPRs are set to 0, so init them
lda #$ff
tam #1 ; 0000-1FFF = Hardware page
tam #%00000001 ; 0000-1FFF = Hardware page
lda #$F8
tam #2 ; 2000-3FFF = Work RAM
tam #%00000010 ; 2000-3FFF = Work RAM
;lda #$F7
;tam #2 ; 4000-5FFF = Save RAM
;tam #%00000100 ; 4000-5FFF = Save RAM
;lda #1
;tam #3 ; 6000-7FFF Page 2
;tam #%00001000 ; 6000-7FFF Page 2
;lda #2
;tam #4 ; 8000-9FFF Page 3
;tam #%00010000 ; 8000-9FFF Page 3
;lda #3
;tam #5 ; A000-BFFF Page 4
;tam #%00100000 ; A000-BFFF Page 4
;lda #4
;tam #6 ; C000-DFFF Page 5
;tam #%01000000 ; C000-DFFF Page 5
;lda #0
;tam #7 ; e000-fFFF hucard/syscard bank 0
;tam #%10000000 ; e000-fFFF hucard/syscard bank 0
; Clear work RAM (2000-3FFF)
stz <$00
@@ -88,110 +89,87 @@ start:
.import vdc_init
jsr vdc_init
;; jsr joy_init
; Turn on background and VD interrupt/IRQ1
lda #$05
sta IRQ_MASK ; IRQ1=on
cli
; Clear the BSS data
; Clear the BSS data
jsr zerobss
jsr zerobss
; Copy the .data segment to RAM
lda #<(__DATA_LOAD__)
;;lda #<(__ROM0_START__ + __STARTUP_SIZE__+ __CODE_SIZE__+ __RODATA_SIZE__)
;;lda #<(__ROM_START__ + __CODE_SIZE__+ __RODATA_SIZE__)
sta ptr1
lda #>(__DATA_LOAD__)
;;lda #>(__ROM_START__ + __CODE_SIZE__+ __RODATA_SIZE__)
sta ptr1+1
lda #<(__DATA_RUN__)
;;lda #<(__SRAM_START__)
sta ptr2
lda #>(__DATA_RUN__)
;;lda #>(__SRAM_START__)
sta ptr2+1
ldx #>(__DATA_SIZE__)
; Copy the .data segment to RAM
lda #<(__DATA_LOAD__)
sta ptr1
lda #>(__DATA_LOAD__)
sta ptr1+1
lda #<(__DATA_RUN__)
sta ptr2
lda #>(__DATA_RUN__)
sta ptr2+1
ldx #>(__DATA_SIZE__)
@l2:
beq @s1 ; no more full pages
beq @s1 ; no more full pages
; copy one page
ldy #0
; copy one page
ldy #0
@l1:
lda (ptr1),y
sta (ptr2),y
iny
bne @l1
lda (ptr1),y
sta (ptr2),y
iny
bne @l1
inc ptr1+1
inc ptr2+1
inc ptr1+1
inc ptr2+1
dex
bne @l2
dex
bne @l2
; copy remaining bytes
; copy remaining bytes
@s1:
; copy one page
ldy #0
; copy one page
ldy #0
@l3:
lda (ptr1),y
sta (ptr2),y
iny
cpy #<(__DATA_SIZE__)
bne @l3
lda (ptr1),y
sta (ptr2),y
iny
cpy #<(__DATA_SIZE__)
bne @l3
; setup the stack
; setup the stack
lda #<(__RAM_START__+__RAM_SIZE__)
sta sp
lda #>(__RAM_START__+__RAM_SIZE__)
sta sp+1
; lda #<(__RAM_START__ + __DATA_SIZE__ + __BSS_SIZE__)
lda #<(__RAM_START__+__RAM_SIZE__)
sta sp
; lda #>(__RAM_START__ + __DATA_SIZE__ + __BSS_SIZE__)
lda #>(__RAM_START__+__RAM_SIZE__)
sta sp+1 ; Set argument stack ptr
; Init the Heap
jsr initheap
; Init the Heap
jsr initheap
; Call module constructors
jsr initlib
;jmp *
;; FIXME: this should be called from a constructor instead
.import initconio
jsr initconio
; Call module constructors
; Pass an empty command line
jsr push0 ; argc
jsr push0 ; argv
jsr initlib
;; FIXME: this should be called from a constructor instead
.import initconio
jsr initconio
; Pass an empty command line
;jmp *
jsr push0 ; argc
jsr push0 ; argv
go:
ldy #4 ; Argument size
jsr _main ; call the users code
; Call module destructors. This is also the _exit entry.
ldy #4 ; Argument size
jsr _main ; call the users code
; Call module destructors. This is also the _exit entry.
_exit:
jsr donelib ; Run module destructors
jsr donelib ; Run module destructors
; reset the PCEngine
jmp start
; reset the PCEngine (start over)
jmp start
; ------------------------------------------------------------------------
; System V-Blank Interupt
; FIXME: hooks should be provided so the user can abuse the IRQ
; ------------------------------------------------------------------------
_irq1:
@@ -201,10 +179,13 @@ _irq1:
inc _tickcount
bne @s
bne @s1
inc _tickcount+1
@s:
bne @s1
inc _tickcount+2
bne @s1
inc _tickcount+3
@s1:
; Acknowlege interrupt
ldaio VDC_CTRL
@@ -227,14 +208,10 @@ initmainargs:
; ------------------------------------------------------------------------
; hardware vectors
; ------------------------------------------------------------------------
.segment "VECTORS"
;;.org $fff6
.word _irq2 ; $fff6 IRQ2 (External IRQ, BRK)
.word _irq1 ; $fff8 IRQ1 (VDC)
.word _timer ; $fffa Timer
.word _nmi ; $fffc NMI
.word start ; $fffe reset
.segment "VECTORS"
.word _irq2 ; $fff6 IRQ2 (External IRQ, BRK)
.word _irq1 ; $fff8 IRQ1 (VDC)
.word _timer ; $fffa Timer
.word _nmi ; $fffc NMI
.word start ; $fffe reset