diff options
Diffstat (limited to 'sysdeps/mach/hurd/i386/sigreturn.c')
| -rw-r--r-- | sysdeps/mach/hurd/i386/sigreturn.c | 139 |
1 files changed, 0 insertions, 139 deletions
diff --git a/sysdeps/mach/hurd/i386/sigreturn.c b/sysdeps/mach/hurd/i386/sigreturn.c deleted file mode 100644 index ce0f656ff0..0000000000 --- a/sysdeps/mach/hurd/i386/sigreturn.c +++ /dev/null @@ -1,139 +0,0 @@ -/* Copyright (C) 1991-2017 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 - <http://www.gnu.org/licenses/>. */ - -register int *sp asm ("%esp"); - -#include <hurd.h> -#include <hurd/signal.h> -#include <hurd/threadvar.h> -#include <hurd/msg.h> -#include <stdlib.h> -#include <string.h> - -int -__sigreturn (struct sigcontext *scp) -{ - struct hurd_sigstate *ss; - struct hurd_userlink *link = (void *) &scp[1]; - mach_port_t *reply_port; - - if (scp == NULL || (scp->sc_mask & _SIG_CANT_MASK)) - { - errno = EINVAL; - return -1; - } - - ss = _hurd_self_sigstate (); - __spin_lock (&ss->lock); - - /* Remove the link on the `active resources' chain added by - _hurd_setup_sighandler. Its purpose was to make sure - that we got called; now we have, it is done. */ - _hurd_userlink_unlink (link); - - /* Restore the set of blocked signals, and the intr_port slot. */ - ss->blocked = scp->sc_mask; - ss->intr_port = scp->sc_intr_port; - - /* Check for pending signals that were blocked by the old set. */ - if (ss->pending & ~ss->blocked) - { - /* There are pending signals that just became unblocked. Wake up the - signal thread to deliver them. But first, squirrel away SCP where - the signal thread will notice it if it runs another handler, and - arrange to have us called over again in the new reality. */ - ss->context = scp; - __spin_unlock (&ss->lock); - __msg_sig_post (_hurd_msgport, 0, 0, __mach_task_self ()); - /* If a pending signal was handled, sig_post never returned. - If it did return, the pending signal didn't run a handler; - proceed as usual. */ - __spin_lock (&ss->lock); - ss->context = NULL; - } - - if (scp->sc_onstack) - { - ss->sigaltstack.ss_flags &= ~SS_ONSTACK; /* XXX threadvars */ - /* XXX cannot unlock until off sigstack */ - abort (); - } - else - __spin_unlock (&ss->lock); - - /* Destroy the MiG reply port used by the signal handler, and restore the - reply port in use by the thread when interrupted. */ - reply_port = - (mach_port_t *) __hurd_threadvar_location (_HURD_THREADVAR_MIG_REPLY); - if (*reply_port) - { - mach_port_t port = *reply_port; - - /* Assigning MACH_PORT_DEAD here tells libc's mig_get_reply_port not to - get another reply port, but avoids mig_dealloc_reply_port trying to - deallocate it after the receive fails (which it will, because the - reply port will be bogus, whether we do this or not). */ - *reply_port = MACH_PORT_DEAD; - - __mach_port_destroy (__mach_task_self (), port); - } - *reply_port = scp->sc_reply_port; - - if (scp->sc_fpused) - /* Restore the FPU state. Mach conveniently stores the state - in the format the i387 `frstor' instruction uses to restore it. */ - asm volatile ("frstor %0" : : "m" (scp->sc_fpsave)); - - { - /* There are convenient instructions to pop state off the stack, so we - copy the registers onto the user's stack, switch there, pop and - return. */ - - int *usp = (int *) scp->sc_uesp; - - *--usp = scp->sc_eip; - *--usp = scp->sc_efl; - memcpy (usp -= 12, &scp->sc_i386_thread_state, 12 * sizeof (int)); - - sp = usp; - -#define A(line) asm volatile (#line) - /* The members in the sigcontext are arranged in this order - so we can pop them easily. */ - - /* Pop the segment registers (except %cs and %ss, done last). */ - A (popl %gs); - A (popl %fs); - A (popl %es); - A (popl %ds); - /* Pop the general registers. */ - A (popa); - /* Pop the processor flags. */ - A (popf); - /* Return to the saved PC. */ - A (ret); - - /* Firewall. */ - A (hlt); -#undef A - } - - /* NOTREACHED */ - return -1; -} - -weak_alias (__sigreturn, sigreturn) |