* device/include/pic16/pic18f[24][3456]k20.h,

[fw/sdcc] / device / lib / pic16 / startup / crt0.c

diff --git a/device/lib/pic16/startup/crt0.c b/device/lib/pic16/startup/crt0.c
index a6d134dea9fda04d17af83190586ed936c23e7cb..f3fa397ae6158dfd9bcc40fc2652c8f732b3f5b9 100644 (file)
--- a/device/lib/pic16/startup/crt0.c
+++ b/device/lib/pic16/startup/crt0.c
@@ -1,56 +1,79 @@
 /*
  * crt0.c - SDCC pic16 port runtime start code
  *
+ *
  * Converted for SDCC and pic16 port
  * by Vangelis Rokas (vrokas@otenet.gr)
  *
  * based on Microchip MPLAB-C18 startup files
  *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2, or (at your option) any
+ * later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ * In other words, you are welcome to use, share and improve this program.
+ * You are forbidden to forbid anyone else to use, share and improve
+ * what you give them.   Help stamp out software-hoarding!
+ *
  * $Id$
  */
 
-extern stack;
-
+extern stack_end;
 extern TBLPTRU;
 
 /* external reference to the user's main routine */
 extern void main (void);
 
-/* prototype for the startup function */
-void _entry (void) _naked interrupt 0;
-void _startup (void);
+void _entry (void) __naked __interrupt 0;
+void _startup (void) __naked;
+
+/* Access bank selector. */
+#define a 0
 
 
 /*
  * entry function, placed at interrupt vector 0 (RESET)
  */
-
-void _entry (void) _naked interrupt 0
+void _entry (void) __naked __interrupt 0
 {
-  _asm goto __startup _endasm;
+  __asm
+    goto    __startup
+  __endasm;
 }
 
-
-void _startup (void)
+void _startup (void) __naked
 {
-       _asm
-               // Initialize the stack pointer
-               lfsr 1, _stack
-               lfsr 2, _stack
-               clrf _TBLPTRU, 0        // 1st silicon doesn't do this on POR
-    
-               // initialize the flash memory access configuration. this is harmless
-               // for non-flash devices, so we do it on all parts.
-               bsf 0xa6, 7, 0
-               bcf 0xa6, 6, 0
-
-       _endasm ;
-    
-       /* Call the user's main routine */
-       main ();
-
-loop:
-       /* return from main will lock up */
-       goto loop;
+  __asm
+    ; Initialize the stack pointer
+    lfsr    1, _stack_end
+    lfsr    2, _stack_end
+
+    ; 1st silicon does not do this on POR
+    clrf    _TBLPTRU, a
+
+    ; Initialize the flash memory access configuration.
+    ; This is harmless for non-flash devices, so we do it on all parts.
+    bsf     0xa6, 7, a      ; EECON1.EEPGD = 1, TBLPTR accesses program memory
+    bcf     0xa6, 6, a      ; EECON1.CFGS  = 0, TBLPTR accesses program memory
+  __endasm;
+
+  /* Call the main routine. */
+  main();
+
+  __asm
+lockup:
+    ; Returning from main will lock up.
+    bra     lockup
+  __endasm;
 }