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Use AX paradigm for stack initalization.

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This commit is contained in:
Oliver Schmidt
2016-03-07 01:44:19 +01:00
parent d8c31cf1d3
commit 69fbcb30fd
4 changed files with 14 additions and 15 deletions
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libsrc/pce/crt0.s
+8 -9
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@@ -39,22 +39,21 @@
start:
; setup the CPU and System-IRQ
; Set up the CPU and System-IRQ
; Initialize CPU
sei
nop
csh ; set high speed CPU mode
csh ; Set high speed CPU mode
nop
cld
nop
; Setup stack and memory mapping
; Set up stack and memory mapping
ldx #$FF ; Stack top ($21FF)
txs
; at startup all MPRs are set to 0, so init them
; At startup all MPRs are set to 0, so init them
lda #$ff
tam #%00000001 ; 0000-1FFF = Hardware page
lda #$F8
@@ -98,11 +97,11 @@ start:
; Copy the .data segment to RAM
tii __DATA_LOAD__, __DATA_RUN__, __DATA_SIZE__
; setup the stack
; Set up the stack
lda #<(__RAM_START__+__RAM_SIZE__)
ldx #>(__RAM_START__+__RAM_SIZE__)
sta sp
lda #>(__RAM_START__+__RAM_SIZE__)
sta sp + 1
stx sp + 1
; Call module constructors
jsr initlib
@@ -114,7 +113,7 @@ start:
jsr push0 ; argv
ldy #4 ; Argument size
jsr _main ; call the users code
jsr _main ; Call the users code
; Call module destructors. This is also the _exit entry.
_exit: