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/* rtems.s
*
* This file contains the single entry point code for
* the SPARC port of RTEMS.
*
* COPYRIGHT (c) 1989-1998.
* On-Line Applications Research Corporation (OAR).
* Copyright assigned to U.S. Government, 1994.
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.OARcorp.com/rtems/license.html.
*
* Ported to ERC32 implementation of the SPARC by On-Line Applications
* Research Corporation (OAR) under contract to the European Space
* Agency (ESA).
*
* ERC32 modifications of respective RTEMS file: COPYRIGHT (c) 1995.
* European Space Agency.
*
* $Id$
*/
#include <asm.h>
/*
* RTEMS
*
* This routine jumps to the directive indicated in the
* CPU defined register. This routine is used when RTEMS is
* linked by itself and placed in ROM. This routine is the
* first address in the ROM space for RTEMS. The user "calls"
* this address with the directive arguments in the normal place.
* This routine then jumps indirectly to the correct directive
* preserving the arguments. The directive should not realize
* it has been "wrapped" in this way. The table "_Entry_points"
* is used to look up the directive.
*
* void RTEMS()
*/
.align 4
PUBLIC(RTEMS)
SYM(RTEMS):
/*
* g2 was chosen because gcc uses it as a scratch register in
* similar code scenarios and the other locals, ins, and outs
* are off limits to this routine unless it does a "save" and
* copies its in registers to the outs which only works up until
* 6 parameters. Best to take the simple approach in this case.
*/
sethi SYM(_Entry_points), %g2
or %g2, %lo(SYM(_Entry_points)), %g2
sll %g1, 2, %g1
add %g1, %g2, %g2
jmp %g2
nop
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