223cc6685e
git-svn-id: svn://svn.compuextreme.de/Viitor/V963/Viitor_cc65@5933 504e572c-2e33-0410-9681-be2bf7408885
51 lines
1.7 KiB
HTML
51 lines
1.7 KiB
HTML
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<TITLE>cc65 function reference: Alphabetical function reference: _sys</TITLE>
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<H2><A NAME="_sys"></A> 3.9 <A HREF="funcref.html#toc3.9">_sys</A></H2>
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<P>
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<BLOCKQUOTE>
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<DL>
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<DT><B>Function</B><DD><P>Call a subroutine passing register values.</P>
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<DT><B>Header</B><DD><P><CODE>
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<A HREF="funcref-3.html#6502.h">6502.h</A></CODE></P>
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<DT><B>Declaration</B><DD><P><CODE>void __fastcall__ _sys (struct regs* r);</CODE></P>
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<DT><B>Description</B><DD><P>The function will call the subroutine at the address
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specified in the <CODE>pc</CODE> member of the passed <CODE>regs</CODE> structure. All
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registers and the CPU flags are set to the values given in the <CODE>regs</CODE>
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structure. On return from the subroutine, the new values of the registers and
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flags are stored back overwriting the old values.</P>
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<DT><B>Limits</B><DD><P>
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<UL>
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<LI>Bits 4 and 5 of the flags value in the <CODE>regs</CODE> structure are ignored
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when calling the subroutine (they are unchanged from their current values).</LI>
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<LI>The function is only available as fastcall function, so it may only be
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used in presence of a prototype.</LI>
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</UL>
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</P>
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<DT><B>Availability</B><DD><P>cc65</P>
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<DT><B>Example</B><DD><P>None.</P>
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</DL>
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