funcref-49.html

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"><HTML><HEAD> <META NAME="GENERATOR" CONTENT="LinuxDoc-Tools 0.9.20"> <TITLE>cc65 function reference: Alphabetical function reference: _sys</TITLE> <LINK HREF="funcref-50.html" REL=next> <LINK HREF="funcref-48.html" REL=previous> <LINK HREF="funcref.html#toc3" REL=contents></HEAD><BODY><A HREF="funcref-50.html">Next</A><A HREF="funcref-48.html">Previous</A><A HREF="funcref.html#toc3">Contents</A><HR><H2><A NAME="_sys"></A> 3.8 <A HREF="funcref.html#toc3.8">_sys</A></H2><P><BLOCKQUOTE><DL><DT><B>Function</B><DD><P>Call a subroutine passing register values.</P><DT><B>Header</B><DD><P><CODE><A HREF="funcref-3.html#6502.h">6502.h</A></CODE></P><DT><B>Declaration</B><DD><P><CODE>void __fastcall__ _sys (struct regs* r);</CODE></P><DT><B>Description</B><DD><P>The function will call the subroutine at the addressspecified in the <CODE>pc</CODE> member of the passed <CODE>regs</CODE> structure. Allregisters and the CPU flags are set to the values given in the <CODE>regs</CODE>structure. On return from the subroutine, the new values of the registers andflags are stored back overwriting the old values.</P><DT><B>Limits</B><DD><P><UL><LI>Bits 4 and 5 of the flags value in the <CODE>regs</CODE> structure are ignoredwhen calling the subroutine (they are unchanged from their current values).</LI><LI>The function is only available as fastcall function, so it may only beused in presence of a prototype.</LI></UL></P><DT><B>Availability</B><DD><P>cc65</P><DT><B>Example</B><DD><P>None.</P></DL></BLOCKQUOTE></P><HR><A HREF="funcref-50.html">Next</A><A HREF="funcref-48.html">Previous</A><A HREF="funcref.html#toc3">Contents</A></BODY></HTML>

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