224 lines
6.6 KiB
C
224 lines
6.6 KiB
C
/* Copyright (C) 1996, 1997, 1998 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 Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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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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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <hurd.h>
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#include <hurd/signal.h>
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#include <hurd/threadvar.h>
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#include <stdlib.h>
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#include <mach/mips/mips_instruction.h>
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int
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__sigreturn (struct sigcontext *scp)
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{
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struct hurd_sigstate *ss;
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struct hurd_userlink *link = (void *) &scp[1];
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mach_port_t *reply_port;
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if (scp == NULL || (scp->sc_mask & _SIG_CANT_MASK))
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{
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errno = EINVAL;
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return -1;
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}
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ss = _hurd_self_sigstate ();
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__spin_lock (&ss->lock);
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/* Remove the link on the `active resources' chain added by
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_hurd_setup_sighandler. Its purpose was to make sure
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that we got called; now we have, it is done. */
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_hurd_userlink_unlink (link);
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/* Restore the set of blocked signals, and the intr_port slot. */
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ss->blocked = scp->sc_mask;
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ss->intr_port = scp->sc_intr_port;
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/* Check for pending signals that were blocked by the old set. */
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if (ss->pending & ~ss->blocked)
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{
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/* There are pending signals that just became unblocked. Wake up the
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signal thread to deliver them. But first, squirrel away SCP where
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the signal thread will notice it if it runs another handler, and
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arrange to have us called over again in the new reality. */
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ss->context = scp;
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__spin_unlock (&ss->lock);
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__msg_sig_post (_hurd_msgport, 0, 0, __mach_task_self ());
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/* If a pending signal was handled, sig_post never returned. */
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__spin_lock (&ss->lock);
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ss->context = NULL;
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}
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if (scp->sc_onstack)
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{
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ss->sigaltstack.ss_flags &= ~SS_ONSTACK; /* XXX threadvars */
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/* XXX cannot unlock until off sigstack */
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abort ();
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}
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else
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__spin_unlock (&ss->lock);
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/* Destroy the MiG reply port used by the signal handler, and restore the
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reply port in use by the thread when interrupted. */
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reply_port =
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(mach_port_t *) __hurd_threadvar_location (_HURD_THREADVAR_MIG_REPLY);
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if (*reply_port)
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{
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mach_port_t port = *reply_port;
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/* Assigning MACH_PORT_DEAD here tells libc's mig_get_reply_port not to
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get another reply port, but avoids mig_dealloc_reply_port trying to
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deallocate it after the receive fails (which it will, because the
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reply port will be bogus, whether we do this or not). */
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*reply_port = MACH_PORT_DEAD;
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__mach_port_destroy (__mach_task_self (), port);
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}
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*reply_port = scp->sc_reply_port;
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if (scp->sc_coproc_used & SC_COPROC_USE_FPU)
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{
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/* Restore FPU state. */
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#define restore_fpr(n) \
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asm volatile ("l.d $f" #n ",%0" : : "m" (scp->sc_fpr[n]))
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/* Restore floating-point registers. */
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#ifdef __mips64
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restore_fpr (0);
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restore_fpr (1);
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restore_fpr (2);
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restore_fpr (3);
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restore_fpr (4);
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restore_fpr (5);
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restore_fpr (6);
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restore_fpr (7);
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restore_fpr (8);
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restore_fpr (9);
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restore_fpr (10);
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restore_fpr (11);
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restore_fpr (12);
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restore_fpr (13);
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restore_fpr (14);
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restore_fpr (15);
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restore_fpr (16);
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restore_fpr (17);
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restore_fpr (18);
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restore_fpr (19);
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restore_fpr (20);
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restore_fpr (21);
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restore_fpr (22);
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restore_fpr (23);
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restore_fpr (24);
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restore_fpr (25);
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restore_fpr (26);
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restore_fpr (27);
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restore_fpr (28);
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restore_fpr (29);
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restore_fpr (30);
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restore_fpr (31);
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#else
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restore_fpr (0);
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restore_fpr (2);
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restore_fpr (4);
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restore_fpr (6);
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restore_fpr (8);
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restore_fpr (10);
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restore_fpr (12);
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restore_fpr (14);
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restore_fpr (16);
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restore_fpr (18);
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restore_fpr (20);
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restore_fpr (22);
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restore_fpr (24);
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restore_fpr (26);
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restore_fpr (28);
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restore_fpr (30);
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#endif
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/* Restore the floating-point control/status register ($f31). */
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asm volatile ("ctc1 %0,$f31" : : "r" (scp->sc_fpcsr));
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}
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/* Load all the registers from the sigcontext. */
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#ifdef __mips64
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#define restore_gpr(n) \
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asm volatile ("ld $" #n ",%0" : : "m" (scpreg->sc_gpr[n - 1]))
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#else
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#define restore_gpr(n) \
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asm volatile ("lw $" #n ",%0" : : "m" (scpreg->sc_gpr[n - 1]))
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#endif
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{
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register const struct sigcontext *const scpreg asm ("$1") = scp;
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register int *at asm ("$1");
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/* First restore the multiplication result registers. The compiler
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will use some temporary registers, so we do this before restoring
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the general registers. */
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asm volatile ("mtlo %0" : : "r" (scpreg->sc_mdlo));
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asm volatile ("mthi %0" : : "r" (scpreg->sc_mdhi));
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/* In the word after the saved PC, store the saved $1 value. */
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(&scpreg->sc_pc)[1] = scpreg->sc_gpr[0];
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asm volatile (".set noreorder; .set noat;");
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/* Restore the normal registers. */
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restore_gpr (2);
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restore_gpr (3);
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restore_gpr (4);
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restore_gpr (5);
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restore_gpr (6);
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restore_gpr (7);
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restore_gpr (8);
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restore_gpr (9);
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restore_gpr (10);
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restore_gpr (11);
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restore_gpr (12);
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restore_gpr (13);
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restore_gpr (14);
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restore_gpr (15);
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restore_gpr (16);
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restore_gpr (17);
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restore_gpr (18);
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restore_gpr (19);
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restore_gpr (20);
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restore_gpr (21);
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restore_gpr (22);
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restore_gpr (23);
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restore_gpr (24);
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restore_gpr (25);
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/* Registers 26-27 are kernel-only. */
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restore_gpr (28);
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restore_gpr (29); /* Stack pointer. */
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restore_gpr (30); /* Frame pointer. */
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restore_gpr (31); /* Return address. */
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at = &scpreg->sc_pc;
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/* This is an emulated instruction that will find at the address in $1
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two words: the PC value to restore, and the $1 value to restore. */
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asm volatile (".word %0" : : "i" (op_sigreturn));
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asm volatile (".set reorder; .set at;");
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/* NOTREACHED */
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return at; /* To prevent optimization. */
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}
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/* NOTREACHED */
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return -1;
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}
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weak_alias (__sigreturn, sigreturn)
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