Fixed _textcolor definition.

[cc65] / libsrc / atari / crt0.s

diff --git a/libsrc/atari/crt0.s b/libsrc/atari/crt0.s
index 0ea6e390f0f750fbf47032d77fe58aaa55dd1f68..97b7d7e95df3f344e66f5047770ecda27f1a0750 100644 (file)
--- a/libsrc/atari/crt0.s
+++ b/libsrc/atari/crt0.s
@@ -9,12 +9,13 @@
 ;
 
         .export         __STARTUP__ : absolute = 1      ; Mark as startup
-        .export         _exit, start
+        .export         _exit, start, excexit, SP_save
 
         .import         initlib, donelib
         .import         callmain, zerobss
         .import         __RESERVED_MEMORY__
-        .import         __RAM_START__, __RAM_SIZE__
+        .import         __MAIN_START__, __MAIN_SIZE__
+        .import         __LOWCODE_RUN__, __LOWCODE_SIZE__
 .ifdef __ATARIXL__
         .import         __STACKSIZE__
         .import         sram_init
@@ -55,19 +56,19 @@ start:
 
 .ifdef __ATARIXL__
 
-        lda     #<(__RAM_START__ + __RAM_SIZE__ + __STACKSIZE__)
+        lda     #<(__MAIN_START__ + __MAIN_SIZE__ + __STACKSIZE__)
+        ldx     #>(__MAIN_START__ + __MAIN_SIZE__ + __STACKSIZE__)
         sta     sp
-        lda     #>(__RAM_START__ + __RAM_SIZE__ + __STACKSIZE__)
-        sta     sp+1
+        stx     sp+1
 
 .else
 
 ; Report the memory usage.
 
         lda     APPMHI
+        ldx     APPMHI+1
         sta     APPMHI_save             ; remember old APPMHI value
-        lda     APPMHI+1
-        sta     APPMHI_save+1
+        stx     APPMHI_save+1
 
         sec
         lda     MEMTOP
@@ -109,12 +110,12 @@ start:
 
 ; Call the module destructors. This is also the exit() entry.
 
-_exit:  jsr     donelib         ; Run module destructors
+_exit:  ldx     SP_save
+        txs                     ; Restore stack pointer
 
 ; Restore the system stuff.
 
-        ldx     SP_save
-        txs                     ; Restore stack pointer
+excexit:jsr     donelib         ; Run module destructors; 'excexit' is called from the exec routine
 
 ; Restore the left margin.
 
@@ -129,9 +130,9 @@ _exit:  jsr     donelib         ; Run module destructors
 ; Restore APPMHI.
 
         lda     APPMHI_save
+        ldx     APPMHI_save+1
         sta     APPMHI
-        lda     APPMHI_save+1
-        sta     APPMHI+1
+        stx     APPMHI+1
 
 .ifdef __ATARIXL__
 
@@ -142,9 +143,9 @@ _exit:  jsr     donelib         ; Run module destructors
         lda     RAMTOP_save
         sta     RAMTOP
         lda     MEMTOP_save
+        ldx     MEMTOP_save+1
         sta     MEMTOP
-        lda     MEMTOP_save+1
-        sta     MEMTOP+1
+        stx     MEMTOP+1
 
 
 ; Issue a GRAPHICS 0 call (copied'n'pasted from the TGI drivers), in
@@ -199,3 +200,11 @@ LMARGN_save:    .res    1
 .ifndef __ATARIXL__
 APPMHI_save:    .res    2
 .endif
+
+; ------------------------------------------------------------------------
+
+.segment "LOWCODE"       ; have at least one (empty) segment of LOWCODE, so that the next line works even if the program doesn't make use of this segment
+.assert (__LOWCODE_RUN__ + __LOWCODE_SIZE__ <= $4000 || __LOWCODE_RUN__ > $7FFF || __LOWCODE_SIZE__ = 0), warning, "'lowcode area' reaches into $4000..$7FFF bank memory window"
+; check for LOWBSS_SIZE = 0 not needed since the only file which uses LOWBSS (irq.s) also uses LOWCODE
+; check for LOWCODE_RUN > $7FFF is mostly for cartridges, where this segment is loaded high (into cart ROM)
+; there is a small chance that if the user loads the program really high, LOWCODE is above $7FFF, but LOWBSS is below -- no warning emitted in this case