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/* Install given context.
Copyright (C) 2008-2020 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Helge Deller <deller@gmx.de>, 2008.
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 <libc-symbols.h>
#include "ucontext_i.h"
ENTRY(__setcontext)
/* Prologue */
stw %r2, -20(%sp)
.cfi_offset 2, -20
stwm %r3, 64(%sp)
.cfi_def_cfa_offset -64
.cfi_offset 3, 0
#ifdef PIC
stw %r19, -32(%sp)
.cfi_offset 19, 32
#endif
/* Save ucp. */
copy %r26, %r3
.Lagain:
/* Set the current signal mask. */
/* sigprocmask(SIG_BLOCK, &ucp->uc_sigmask, NULL); */
copy %r0, %r24
ldo oSIGMASK(%r3), %r25
bl __sigprocmask, %r2
ldi SIG_SETMASK, %r26
comib,<>,n 0,%ret0,.Lerror
/* Save %sp, %dp. */
copy %sp, %r4
copy %dp, %r5
copy %r19, %r6
/* Get the registers. */
ldw oR1(%r3), %r1
ldw oR2(%r3), %r2
/* ldw oR3(%r3), %r3 - used for ucp pointer. */
/* ldw oR4(%r3), %r4 - used for original %sp. */
/* ldw oR5(%r3), %r5 - used for %dp / %r27. */
/* ldw oR6(%r3), %r6 - used for %r19. */
ldw oR7(%r3), %r7
ldw oR8(%r3), %r8
ldw oR9(%r3), %r9
ldw oR10(%r3), %r10
ldw oR11(%r3), %r11
ldw oR12(%r3), %r12
ldw oR13(%r3), %r13
ldw oR14(%r3), %r14
ldw oR15(%r3), %r15
ldw oR16(%r3), %r16
ldw oR17(%r3), %r17
ldw oR18(%r3), %r18
ldw oR19(%r3), %r19
ldw oR20(%r3), %r20
ldw oR21(%r3), %r21
/* ldw oR22(%r3), %r22 - dyncall arg. */
ldw oR23(%r3), %r23
ldw oR24(%r3), %r24
ldw oR25(%r3), %r25
ldw oR26(%r3), %r26
ldw oR27(%r3), %r27
ldw oR28(%r3), %r28
ldw oR29(%r3), %r29
ldw oR30(%r3), %sp
/* ldw oR31(%r3), %r31 - dyncall scratch register */
/* Restore floating-point registers. */
ldo oFPREGS31(%r3), %r22
fldds 0(%r22), %fr31
fldds,mb -8(%r22), %fr30
fldds,mb -8(%r22), %fr29
fldds,mb -8(%r22), %fr28
fldds,mb -8(%r22), %fr27
fldds,mb -8(%r22), %fr26
fldds,mb -8(%r22), %fr25
fldds,mb -8(%r22), %fr24
fldds,mb -8(%r22), %fr23
fldds,mb -8(%r22), %fr22
fldds,mb -8(%r22), %fr21
fldds,mb -8(%r22), %fr20
fldds,mb -8(%r22), %fr19
fldds,mb -8(%r22), %fr18
fldds,mb -8(%r22), %fr17
fldds,mb -8(%r22), %fr16
fldds,mb -8(%r22), %fr15
fldds,mb -8(%r22), %fr14
fldds,mb -8(%r22), %fr13
fldds,mb -8(%r22), %fr12
fldds,mb -8(%r22), %fr11
fldds,mb -8(%r22), %fr10
fldds,mb -8(%r22), %fr9
fldds,mb -8(%r22), %fr8
fldds,mb -8(%r22), %fr7
fldds,mb -8(%r22), %fr6
fldds,mb -8(%r22), %fr5
fldds,mb -8(%r22), %fr4
fldds,mb -8(%r22), %fr3
fldds,mb -8(%r22), %fr2
fldds,mb -8(%r22), %fr1
fldds,mb -8(%r22), %fr0
/* Do not load oSS_SP into %sp. The value of oSS_SP indicates
the start of the user allocated stack, but not the sp that
should be used by the new context. In fact makecontext
will create a frame, and adjust sp as required. We do not
support calling getcontext and modifying ss_sp without
a call to makecontext to synchronize ss_sp into the machine
context. */
/* Call external function. */
copy %r2, %r22
bl $$dyncall, %r31
copy %r31, %r2
/* We return here. Get new ucp in %r3, reload %sp. */
ldw oUC_LINK(%r3), %r3
copy %r4, %sp
copy %r5, %dp
copy %r6, %r19
/* Continue until ucp == NULL. */
comib,<> 0,%r3,.Lagain
nop
/* No further context available. Exit now. */
bl HIDDEN_JUMPTARGET(exit), %r2
ldi 0, %r26
.Lerror:
/* Epilogue */
ldw -84(%r30), %r2
#ifdef PIC
ldw -32(%r30), %r19
#endif
bv %r0(%r2)
ldwm -64(%r30), %r3
L(pseudo_end):
PSEUDO_END(__setcontext)
weak_alias(__setcontext, setcontext)
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