update

codeCore/src/prog8/code/target/neo6502/Neo6502MachineDefinition.kt

@@ -12,6 +12,7 @@ class Neo6502MachineDefinition: IMachineDefinition {
     override val FLOAT_MAX_NEGATIVE = -9.999999999e97
     override val FLOAT_MEM_SIZE = 6
     override val PROGRAM_LOAD_ADDRESS = 0x0800u
+    override val PROGRAM_TOP_ADDRESS = 0xfbffu
 
     override val BSSHIGHRAM_START = 0u    // TODO
     override val BSSHIGHRAM_END = 0u      // TODO
@@ -25,10 +26,6 @@ class Neo6502MachineDefinition: IMachineDefinition {
     override fun convertFloatToBytes(num: Double): List<UByte> = TODO("atari float to bytes")
     override fun convertBytesToFloat(bytes: List<UByte>): Double = TODO("atari bytes to float")
 
-    override fun importLibs(compilerOptions: CompilationOptions, compilationTargetName: String): List<String> {
-        return listOf("syslib")
-    }
-
     override fun launchEmulator(selectedEmulator: Int, programNameWithPath: Path) {
         if(selectedEmulator!=1) {
             System.err.println("The neo target only supports the main emulator (neo).")

compiler/res/prog8lib/neo/syslib.p8

@@ -15,25 +15,13 @@ sys {
 
     const ubyte target = 7         ;  compilation target specifier.  255=virtual, 128=C128, 64=C64, 32=PET, 16=CommanderX16, 8=atari800XL, 7=Neo6502
 
-    asmsub  init_system()  {
-        ; Initializes the machine to a sane starting state.
-        ; Called automatically by the loader program logic.
-        %asm {{
-            sei
-            cld
-            clc
-            ; TODO reset screen mode etc etc?
-            clv
-            ; TODO what about IRQ handler?  cli
-            rts
-        }}
-    }
+    const ubyte sizeof_bool = 1
+    const ubyte sizeof_byte = 1
+    const ubyte sizeof_ubyte = 1
+    const ubyte sizeof_word = 2
+    const ubyte sizeof_uword = 2
+    const ubyte sizeof_float = 0    ; undefined, no floats supported
 
-    asmsub  init_system_phase2()  {
-        %asm {{
-            rts     ; no phase 2 steps on the Neo6502
-        }}
-    }
 
     asmsub  reset_system()  {
         ; Soft-reset the system back to initial power-on status
@@ -216,6 +204,7 @@ save_SCRATCH_ZPB1	.byte  0
 save_SCRATCH_ZPREG	.byte  0
 save_SCRATCH_ZPWORD1	.word  0
 save_SCRATCH_ZPWORD2	.word  0
+            ; !notreached!
         }}
     }
 
@@ -239,27 +228,38 @@ save_SCRATCH_ZPWORD2	.word  0
 
     asmsub exit(ubyte returnvalue @A) {
         ; -- immediately exit the program with a return code in the A register
-        ;    TODO where to store A as exit code?
         %asm {{
+            sta  cleanup_at_exit._exitcode
             ldx  prog8_lib.orig_stackpointer
             txs
-            rts		; return to original caller
+            jmp  cleanup_at_exit
         }}
     }
 
     asmsub exit2(ubyte resulta @A, ubyte resultx @X, ubyte resulty @Y) {
         ; -- immediately exit the program with result values in the A, X and Y registers.
-        ;    TODO where to store A,X,Y as exit code?
         %asm {{
-            jmp  exit
+            sta  cleanup_at_exit._exitcode
+            stx  cleanup_at_exit._exitcodeX
+            sty  cleanup_at_exit._exitcodeY
+            ldx  prog8_lib.orig_stackpointer
+            txs
+            jmp  cleanup_at_exit
         }}
     }
 
     asmsub exit3(ubyte resulta @A, ubyte resultx @X, ubyte resulty @Y, bool carry @Pc) {
         ; -- immediately exit the program with result values in the A, X and Y registers, and the Carry flag in the status register.
-        ;    TODO where to store A,X,Y,Carry as exit code?
         %asm {{
-            jmp  exit
+            sta  cleanup_at_exit._exitcode
+            lda  #0
+            rol  a
+            sta  cleanup_at_exit._exitcodeCarry
+            stx  cleanup_at_exit._exitcodeX
+            sty  cleanup_at_exit._exitcodeY
+            ldx  prog8_lib.orig_stackpointer
+            txs
+            jmp  cleanup_at_exit
         }}
     }
 
@@ -417,6 +417,7 @@ cx16 {
     _cx16_vreg_storage
             .word 0,0,0,0,0,0,0,0
             .word 0,0,0,0,0,0,0,0
+            ; !notreached!
         }}
     }
 
@@ -437,3 +438,44 @@ cx16 {
     }
 
 }
+
+p8_sys_startup {
+    ; program startup and shutdown machinery. Needs to reside in normal system ram.
+
+    asmsub  init_system()  {
+        ; Initializes the machine to a sane starting state.
+        ; Called automatically by the loader program logic.
+        %asm {{
+            sei
+            cld
+            clc
+            ; TODO reset screen mode etc etc?
+            clv
+            ; TODO what about IRQ handler?  cli
+            rts
+        }}
+    }
+
+    asmsub  init_system_phase2()  {
+        %asm {{
+            rts     ; no phase 2 steps on the Neo6502
+        }}
+    }
+
+    asmsub  cleanup_at_exit() {
+        ; executed when the main subroutine does rts
+        %asm {{
+_exitcodeCarry = *+1
+            lda  #0
+            lsr  a
+_exitcode = *+1
+            lda  #0        ; exit code possibly modified in exit()
+_exitcodeX = *+1
+            ldx  #0
+_exitcodeY = *+1
+            ldy  #0
+            rts
+        }}
+    }
+
+}