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Merge pull request #222 from mrdudz/pcedatacopy

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use tii instead of copy loop to copy data section to ram
This commit is contained in:
Oliver Schmidt
2015-10-22 21:17:50 +02:00
parent a957f80204 8f8f12ceab
commit 2cbc8fbd64
1 changed files with 1 additions and 37 deletions
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38
libsrc/pce/crt0.s
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@@ -96,43 +96,7 @@ start:
jsr zerobss jsr zerobss
; Copy the .data segment to RAM ; Copy the .data segment to RAM
lda #<(__DATA_LOAD__) tii __DATA_LOAD__, __DATA_RUN__, __DATA_SIZE__
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
; copy one page
ldy #0
@l1:
lda (ptr1),y
sta (ptr2),y
iny
bne @l1
inc ptr1+1
inc ptr2+1
dex
bne @l2
; copy remaining bytes
@s1:
; copy one page
ldy #0
@l3:
lda (ptr1),y
sta (ptr2),y
iny
cpy #<(__DATA_SIZE__)
bne @l3
; setup the stack ; setup the stack
lda #<(__RAM_START__+__RAM_SIZE__) lda #<(__RAM_START__+__RAM_SIZE__)