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152 lines
3.5 KiB
ArmAsm
152 lines
3.5 KiB
ArmAsm
/* Copyright (C) 2001-2023 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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#include <features.h>
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#include "ucontext_i.h"
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/* __setcontext (const ucontext_t *ucp)
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Restores the machine context in UCP and thereby resumes execution
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in that context.
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This implementation in intended to be used for *synchronous* context
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switches only. Therefore, it does not have to restore anything
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other than the PRESERVED state. */
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ENTRY(__setcontext)
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.prologue
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.body
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alloc r11 = ar.pfs, 1, 0, 4, 0
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// sigprocmask (SIG_SETMASK, &sc->sc_mask, NULL):
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mov r3 = SC_MASK
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mov out0 = SIG_SETMASK
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;;
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add out1 = r3, in0
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mov out2 = 0
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mov out3 = 8 // sizeof kernel sigset_t
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invala
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DO_CALL(__NR_rt_sigprocmask)
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add r2 = SC_NAT, r32
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add r3 = SC_RNAT, r32 // r3 <- &sc_ar_rnat
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add rPOS = SC_GR, r32 // rPOS <- &sc_gr[0]
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;;
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ld8 rNAT = [r2], (SC_BSP-SC_NAT)
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extr.u rPOS = rPOS, 3, 6 // get NaT bit number for r0
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;;
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ld8 rBSP = [r2], (SC_UNAT-SC_BSP)
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ld8 rRNAT = [r3], (SC_FPSR-SC_RNAT)
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/*
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* Rotate NaT bits by rPOS positions to the left:
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*/
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sub rCPOS = 64, rPOS
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;;
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ld8 rUNAT = [r2], (SC_PFS-SC_UNAT)
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ld8 rFPSR = [r3], (SC_LC-SC_FPSR)
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shl rTMP = rNAT, rPOS
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;;
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ld8 rPFS = [r2], (SC_PR-SC_PFS)
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ld8 rLC = [r3], (SC_BR+0*8-SC_LC)
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shr.u rNAT = rNAT, rCPOS
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;;
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ld8 rPR = [r2], (SC_BR+1*8-SC_PR)
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ld8 rB0 = [r3], 16
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or rNAT = rNAT, rTMP
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;;
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ld8 rB1 = [r2], 16
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ld8 rB2 = [r3], 16
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;;
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mov.m ar.unat = rNAT
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mov.m rRSC = ar.rsc
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;;
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ld8 rB3 = [r2], 16
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ld8 rB4 = [r3], (SC_GR+1*8-(SC_BR+4*8))
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;;
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ld8 rB5 = [r2], (SC_GR+4*8-(SC_BR+5*8))
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ld8.fill r1 = [r3], (5*8 - 1*8)
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;;
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ld8.fill r4 = [r2], 16
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ld8.fill r5 = [r3], 16
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mov b0 = rB0
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;;
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ld8.fill r6 = [r2], 48
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ld8.fill r7 = [r3], (SC_FR+2*16-(SC_GR+7*8))
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;;
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ld8.fill sp = [r2], (SC_FR+3*16-(SC_GR+12*8))
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mov.m ar.fpsr = rFPSR
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mov.i ar.pfs = rPFS
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;;
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ldf.fill f3 = [r2], 16
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ldf.fill f2 = [r3], 48
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mov b1 = rB1
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;;
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ldf.fill f4 = [r2], (16*16-4*16)
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ldf.fill f5 = [r3], (17*16-5*16)
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mov b2 = rB2
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;;
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ldf.fill f16 = [r2], 32
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ldf.fill f17 = [r3], 32
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mov b3 = rB3
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;;
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ldf.fill f18 = [r2], 32
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ldf.fill f19 = [r3], 32
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mov b4 = rB4
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;;
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ldf.fill f20 = [r2], 32
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ldf.fill f21 = [r3], 32
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mov b5 = rB5
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;;
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ldf.fill f22 = [r2], 32
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ldf.fill f23 = [r3], 32
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mov r8 = 0
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;;
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ldf.fill f24 = [r2], 32
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ldf.fill f25 = [r3], 32
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mov r9 = 0
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;;
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ldf.fill f26 = [r2], 32
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ldf.fill f27 = [r3], 32
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dep rTMP = 0, rRSC, 16, 14 // clear ar.rsc.loadrs
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;;
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ldf.fill f28 = [r2], 32
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ldf.fill f29 = [r3], 32
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and rTMP = ~0x3, rTMP // clear ar.rsc.mode
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;;
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ldf.fill f30 = [r2], 32
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ldf.fill f31 = [r3], 32
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mov pr = rPR, -1
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;;
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mov.m ar.rsc = rTMP // put RSE into enforced lazy mode
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;;
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loadrs // drop dirty partition
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;;
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mov.m ar.bspstore = rBSP
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mov.m ar.unat = rUNAT
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mov.i ar.lc = rLC
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;;
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mov.m ar.rnat = rRNAT
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mov.m ar.rsc = rRSC
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ret
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END(__setcontext)
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weak_alias (__setcontext, setcontext)
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