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55 jermar 1 
#
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# Copyright (C) 2005 Jakub Jermar
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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#
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# - Redistributions of source code must retain the above copyright
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#   notice, this list of conditions and the following disclaimer.
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# - Redistributions in binary form must reproduce the above copyright
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#   notice, this list of conditions and the following disclaimer in the
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#   documentation and/or other materials provided with the distribution.
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# - The name of the author may not be used to endorse or promote products
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#   derived from this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#
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.text
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.global context_save
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.global context_restore
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context_save:
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	alloc loc0 = ar.pfs, 1, 8, 0, 0
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	mov loc1 = ar.unat	;;
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	/* loc2 */
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	mov loc3 = ar.rsc
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	.auto
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	/*
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	 * Flush dirty registers to backing store.
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	 * After this ar.bsp and ar.bspstore are equal.
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	 */
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	flushrs
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	mov loc4 = ar.bsp
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	/*
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	 * Put RSE to enforced lazy mode.
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	 * So that ar.rnat can be read.
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	 */
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	movl loc5 = ~3
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	and loc5 = loc3, loc5
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	mov ar.rsc = loc5
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	mov loc5 = ar.rnat
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	.explicit
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	mov loc6 = ar.lc
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94 jermar 62 
	/*
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	 * Save application registers
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	 */
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	st8 [in0] = loc0, 8	;;	/* save ar.pfs */
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	st8 [in0] = loc1, 8	;;	/* save ar.unat (caller) */
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	mov loc2 = in0		;;
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	add in0 = 8, in0	;;	/* skip ar.unat (callee) */
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	st8 [in0] = loc3, 8	;;	/* save ar.rsc */
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	st8 [in0] = loc4, 8	;;	/* save ar.bsp */
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	st8 [in0] = loc5, 8	;;	/* save ar.rnat */
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	st8 [in0] = loc6, 8	;;	/* save ar.lc */
83 jermar 73 
 
59 jermar 74 
	/*
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	 * Save general registers including NaT bits
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	 */
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	st8.spill [in0] = r1, 8		;;
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	st8.spill [in0] = r4, 8		;;
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	st8.spill [in0] = r5, 8		;;
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	st8.spill [in0] = r6, 8		;;
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	st8.spill [in0] = r7, 8		;;
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	st8.spill [in0] = r12, 8	;;	/* save sp */
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	st8.spill [in0] = r13, 8	;;
59 jermar 84 
 
83 jermar 85 
	mov loc3 = ar.unat		;;
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	st8 [loc2] = loc3		/* save ar.unat (callee) */
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82 jermar 88 
	/*
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	 * Save branch registers
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	 */
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	mov loc2 = b0		;;
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	st8 [in0] = loc2, 8		/* save pc */
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	mov loc3 = b1		;;
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	st8 [in0] = loc3, 8
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	mov loc4 = b2		;;
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	st8 [in0] = loc4, 8
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	mov loc5 = b3		;;
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	st8 [in0] = loc5, 8
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	mov loc6 = b4		;;
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	st8 [in0] = loc6, 8
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	mov loc7 = b5		;;
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	st8 [in0] = loc7, 8
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	/*
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	 * Save predicate registers
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	 */
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	mov loc2 = pr		;;
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	st8 [in0] = loc2, 8
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	mov ar.unat = loc1
59 jermar 111 
 
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	add r8 = r0, r0, 1 		/* context_save returns 1 */
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	br.ret.sptk.many b0
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context_restore:
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	alloc loc0 = ar.pfs, 1, 8, 0, 0	;;
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	ld8 loc0 = [in0], 8	;;	/* load ar.pfs */
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	ld8 loc1 = [in0], 8	;;	/* load ar.unat (caller) */
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	ld8 loc2 = [in0], 8	;;	/* load ar.unat (callee) */
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	ld8 loc3 = [in0], 8	;;	/* load ar.rsc */
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	ld8 loc4 = [in0], 8	;;	/* load ar.bsp */
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	ld8 loc5 = [in0], 8	;;	/* load ar.rnat */
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	ld8 loc6 = [in0], 8	;;	/* load ar.lc */
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	.auto
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59 jermar 128 
	/*
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	 * Invalidate the ALAT
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	 */
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	invala
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	/*
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	 * Restore application registers
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	 */
100 jermar 136 
 
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	/* TODO: ensure RSE lazy mode */
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	mov ar.bspstore = loc4
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	mov ar.rnat = loc5
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	mov ar.pfs = loc0
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	mov ar.rsc = loc3
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	.explicit
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	mov ar.unat = loc2	;;
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	mov ar.lc = loc6
83 jermar 147 
 
82 jermar 148 
	/*
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	 * Restore general registers including NaT bits
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	 */
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	ld8.fill r1 = [in0], 8	;;
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	ld8.fill r4 = [in0], 8	;;
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	ld8.fill r5 = [in0], 8	;;
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	ld8.fill r6 = [in0], 8	;;
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	ld8.fill r7 = [in0], 8	;;
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	ld8.fill r12 = [in0], 8	;;	/* restore sp */
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	ld8.fill r13 = [in0], 8	;;
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82 jermar 159 
	/*
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	 * Restore branch registers
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	 */
83 jermar 162 
	ld8 loc2 = [in0], 8	;;	/* restore pc */
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	mov b0 = loc2
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	ld8 loc3 = [in0], 8	;;
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	mov b1 = loc3
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	ld8 loc4 = [in0], 8	;;
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	mov b2 = loc4
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	ld8 loc5 = [in0], 8	;;
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	mov b3 = loc5
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	ld8 loc6 = [in0], 8	;;
83 jermar 171 
	mov b4 = loc6
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	ld8 loc7 = [in0], 8	;;
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	mov b5 = loc7
82 jermar 174 
 
83 jermar 175 
	/*
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	 * Restore predicate registers
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	 */
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	ld8 loc2 = [in0], 8	;;
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	mov pr = loc2, ~0
59 jermar 180 
 
83 jermar 181 
	mov ar.unat = loc1
59 jermar 182 
 
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	mov r8 = r0			/* context_restore returns 0 */
60 jermar 184 
	br.ret.sptk.many b0