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30891f35fa
We stopped adding "Contributed by" or similar lines in sources in 2012 in favour of git logs and keeping the Contributors section of the glibc manual up to date. Removing these lines makes the license header a bit more consistent across files and also removes the possibility of error in attribution when license blocks or files are copied across since the contributed-by lines don't actually reflect reality in those cases. Move all "Contributed by" and similar lines (Written by, Test by, etc.) into a new file CONTRIBUTED-BY to retain record of these contributions. These contributors are also mentioned in manual/contrib.texi, so we just maintain this additional record as a courtesy to the earlier developers. The following scripts were used to filter a list of files to edit in place and to clean up the CONTRIBUTED-BY file respectively. These were not added to the glibc sources because they're not expected to be of any use in future given that this is a one time task: https://gist.github.com/siddhesh/b5ecac94eabfd72ed2916d6d8157e7dc https://gist.github.com/siddhesh/15ea1f5e435ace9774f485030695ee02 Reviewed-by: Carlos O'Donell <carlos@redhat.com>
152 lines
3.5 KiB
ArmAsm
152 lines
3.5 KiB
ArmAsm
/* Copyright (C) 2001-2021 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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