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