* src/SDCCglue.c (emitMaps): allow public sfr variables

[fw/sdcc] / device / lib / mcs51 / crtxclear.asm

diff --git a/device/lib/mcs51/crtxclear.asm b/device/lib/mcs51/crtxclear.asm
new file mode 100644 (file)
index 0000000..819c111
--- /dev/null
+++ b/device/lib/mcs51/crtxclear.asm
@@ -0,0 +1,49 @@
+; /*-------------------------------------------------------------------------
+; 
+;   crtxclear.asm :- C run-time: clear XSEG
+; 
+;    This library is free software; you can redistribute it and/or modify it
+;    under the terms of the GNU Library General Public License as published by the
+;    Free Software Foundation; either version 2, or (at your option) any
+;    later version.
+;    
+;    This library 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 Library General Public License for more details.
+;    
+;    You should have received a copy of the GNU Library 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!  
+; -------------------------------------------------------------------------*/
+
+       .area CSEG    (CODE)
+       .area GSINIT0 (CODE)
+       .area GSINIT1 (CODE)
+       .area GSINIT2 (CODE)
+       .area GSINIT3 (CODE)
+       .area GSINIT4 (CODE)
+       .area GSINIT5 (CODE)
+       .area GSINIT  (CODE)
+       .area GSFINAL (CODE)
+       
+       .area GSINIT4 (CODE)
+
+__mcs51_genXRAMCLEAR::
+       mov     r0,#l_XSEG
+       mov     a,r0
+       orl     a,#(l_XSEG >> 8)
+       jz      00005$
+       mov     r1,#((l_XSEG + 255) >> 8)
+       mov     dptr,#s_XSEG
+       clr     a
+00004$:        movx    @dptr,a
+       inc     dptr
+       djnz    r0,00004$
+       djnz    r1,00004$
+00005$:
+