Use AX paradigm for stack initalization.

[cc65] / libsrc / pce / crt0.s

diff --git a/libsrc/pce/crt0.s b/libsrc/pce/crt0.s
index e92e9eca336f057d3fe198f06bb0788a9bc2882c..80b32c0892f5e84d1cb38acec8052bba530a5cf5 100644 (file)
--- a/libsrc/pce/crt0.s
+++ b/libsrc/pce/crt0.s
@@ -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: