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(Logical change 1.186)
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mostang.com!davidm
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/* libunwind - a platform-independent unwind library
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Copyright (C) 2004 Hewlett-Packard Co
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Contributed by David Mosberger-Tang <davidm@hpl.hp.com>
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This file is part of libunwind.
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Permission is hereby granted, free of charge, to any person obtaining
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a copy of this software and associated documentation files (the
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"Software"), to deal in the Software without restriction, including
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without limitation the rights to use, copy, modify, merge, publish,
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distribute, sublicense, and/or sell copies of the Software, and to
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permit persons to whom the Software is furnished to do so, subject to
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the following conditions:
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The above copyright notice and this permission notice shall be
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included in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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#include "ucontext_i.h"
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/* This should be compatible to the libc's getcontext(), except that
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the sc->sc_mask field is always cleared and that the name is
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prefixed with _Uia64_ so we don't step on the application's
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name-space. */
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.align 32
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.protected _Uia64_getcontext
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.global _Uia64_getcontext
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.proc _Uia64_getcontext
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_Uia64_getcontext:
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.prologue
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.body
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alloc r11 = ar.pfs, 1, 0, 0, 0
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flushrs // save dirty partition on rbs
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add r3 = SC_MASK, r32
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;;
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st8 [r3] = r0 // clear sc->sc_mask
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mov.m rFPSR = ar.fpsr
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mov.m rRSC = ar.rsc
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add r2 = SC_GR+1*8, r32
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;;
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mov.m rBSP = ar.bsp
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.prologue
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.save ar.unat, rUNAT
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mov.m rUNAT = ar.unat
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.body
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add r3 = SC_GR+4*8, r32
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;;
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.mem.offset 0,0; st8.spill [r2] = r1, (5*8 - 1*8)
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.mem.offset 8,0; st8.spill [r3] = r4, 16
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mov rPFS = r11
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;;
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.mem.offset 0,0; st8.spill [r2] = r5, 16
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.mem.offset 8,0; st8.spill [r3] = r6, 48
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and rTMP = ~0x3, rRSC
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;;
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.mem.offset 0,0; st8.spill [r2] = r7, (SC_FR+2*16-(SC_GR+7*8))
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.mem.offset 8,0; st8.spill [r3] = sp, (SC_FR+3*16-(SC_GR+12*8))
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;;
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mov.m ar.rsc = rTMP // put RSE into enforced lazy mode
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mov.m rNAT = ar.unat
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mov.i rLC = ar.lc
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;;
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mov.m rRNAT = ar.rnat
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mov.m ar.rsc = rRSC // restore RSE mode
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mov rPR = pr
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/*
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* Rotate NaT bits by rPOS positions to the right:
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*/
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stf.spill [r2] = f2, 32
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stf.spill [r3] = f3, 32
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add rPOS = SC_GR, r32 // rPOS <- &sc_gr[0]
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;;
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stf.spill [r2] = f4, (16*16-4*16)
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stf.spill [r3] = f5, (17*16-5*16)
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extr.u rPOS = rPOS, 3, 6 // get NaT bit number for r0
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;;
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stf.spill [r2] = f16, 32
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stf.spill [r3] = f17, 32
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sub rCPOS = 64, rPOS
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;;
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stf.spill [r2] = f18, 32
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stf.spill [r3] = f19, 32
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shr.u rTMP = rNAT, rPOS
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;;
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stf.spill [r2] = f20, 32
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stf.spill [r3] = f21, 32
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shl rNAT = rNAT, rCPOS
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;;
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stf.spill [r2] = f22, 32
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stf.spill [r3] = f23, 32
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or rNAT = rNAT, rTMP
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;;
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stf.spill [r2] = f24, 32
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stf.spill [r3] = f25, 32
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mov r8 = 0
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;;
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stf.spill [r2] = f26, 32
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stf.spill [r3] = f27, 32
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mov r9 = 1
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;;
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stf.spill [r2] = f28, 32
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stf.spill [r3] = f29, 32
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mov rB0 = b0
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;;
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stf.spill [r2] = f30, 32
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stf.spill [r3] = f31, 32
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mov rB1 = b1
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;;
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mov ar.unat = rUNAT // done with integer regs; restore caller's UNaT
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add r2 = SC_NAT, r32
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add r3 = SC_BSP, r32
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;;
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st8 [r2] = rNAT, (SC_RNAT-SC_NAT)
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st8 [r3] = rBSP, (SC_UNAT-SC_BSP)
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mov rB2 = b2
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;;
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st8 [r2] = rRNAT, (SC_FPSR-SC_RNAT)
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st8 [r3] = rUNAT, (SC_PFS-SC_UNAT)
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mov rB3 = b3
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;;
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st8 [r2] = rFPSR, (SC_LC-SC_FPSR)
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st8 [r3] = rPFS, (SC_PR-SC_PFS)
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mov rB4 = b4
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;;
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st8 [r2] = rLC, (SC_BR+0*8-SC_LC)
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st8 [r3] = rPR, (SC_BR+1*8-SC_PR)
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mov rB5 = b5
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;;
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st8 [r2] = rB0, 16
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st8 [r3] = rB1, 16
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;;
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st8 [r2] = rB2, 16
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st8 [r3] = rB3, 16
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;;
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st8 [r2] = rB4
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st8 [r3] = rB5
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br.ret.sptk.many rp
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.endp _Uia64_getcontext
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