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# Copyright (c) 2005 Jakub Jermar
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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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# - 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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# 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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.global context_restore
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alloc loc0 = ar.pfs, 1, 8, 0, 0
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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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* Put RSE to enforced lazy mode.
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* So that ar.rnat can be read.
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* Save application registers
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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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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 */
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* Save general registers including NaT bits
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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 ;; /* save tp */
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st8 [loc2] = loc3 /* save ar.unat (callee) */
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* Save branch registers
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st8 [in0] = loc2, 8 /* save pc */
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* Save predicate registers
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st8 [in0] = loc2, 16;; /* Next fpu registers should be spilled to 16B aligned address */
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* Save floating-point registers.
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stf.spill [in0] = f2, 16 ;;
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stf.spill [in0] = f3, 16 ;;
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stf.spill [in0] = f4, 16 ;;
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stf.spill [in0] = f5, 16 ;;
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stf.spill [in0] = f16, 16 ;;
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stf.spill [in0] = f17, 16 ;;
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stf.spill [in0] = f18, 16 ;;
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stf.spill [in0] = f19, 16 ;;
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stf.spill [in0] = f20, 16 ;;
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stf.spill [in0] = f21, 16 ;;
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stf.spill [in0] = f22, 16 ;;
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stf.spill [in0] = f23, 16 ;;
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stf.spill [in0] = f24, 16 ;;
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stf.spill [in0] = f25, 16 ;;
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stf.spill [in0] = f26, 16 ;;
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stf.spill [in0] = f27, 16 ;;
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stf.spill [in0] = f28, 16 ;;
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stf.spill [in0] = f29, 16 ;;
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stf.spill [in0] = f30, 16 ;;
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stf.spill [in0] = f31, 16 ;;
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add r8 = r0, r0, 1 /* context_save returns 1 */
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alloc loc0 = ar.pfs, 1, 9, 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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* Invalidate the ALAT
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* Put RSE to enforced lazy mode.
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* So that ar.bspstore and ar.rnat can be written.
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and loc8 = loc3, loc8
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* Flush dirty registers to backing store.
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* We do this because we want the following move
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* to ar.bspstore to assign the same value to ar.bsp.
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* Restore application registers
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mov ar.bspstore = loc4 /* rse.bspload = ar.bsp = ar.bspstore = loc4 */
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mov ar.unat = loc2 ;;
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* Restore general registers including NaT bits
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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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* Restore branch registers
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ld8 loc2 = [in0], 8 ;; /* restore pc */
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ld8 loc3 = [in0], 8 ;;
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ld8 loc4 = [in0], 8 ;;
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ld8 loc5 = [in0], 8 ;;
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ld8 loc6 = [in0], 8 ;;
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ld8 loc7 = [in0], 8 ;;
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* Restore predicate registers
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ld8 loc2 = [in0], 16 ;;
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* Restore floating-point registers.
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ldf.fill f2 = [in0], 16 ;;
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ldf.fill f3 = [in0], 16 ;;
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ldf.fill f4 = [in0], 16 ;;
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ldf.fill f5 = [in0], 16 ;;
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ldf.fill f16 = [in0], 16 ;;
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ldf.fill f17 = [in0], 16 ;;
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ldf.fill f18 = [in0], 16 ;;
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ldf.fill f19 = [in0], 16 ;;
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ldf.fill f20 = [in0], 16 ;;
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ldf.fill f21 = [in0], 16 ;;
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ldf.fill f22 = [in0], 16 ;;
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ldf.fill f23 = [in0], 16 ;;
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ldf.fill f24 = [in0], 16 ;;
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ldf.fill f25 = [in0], 16 ;;
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ldf.fill f26 = [in0], 16 ;;
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ldf.fill f27 = [in0], 16 ;;
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ldf.fill f28 = [in0], 16 ;;
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ldf.fill f29 = [in0], 16 ;;
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ldf.fill f30 = [in0], 16 ;;
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ldf.fill f31 = [in0], 16 ;;
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mov r8 = r0 /* context_restore returns 0 */