diff options
Diffstat (limited to 'sysdeps/mach/hurd/alpha/sigreturn.c')
| -rw-r--r-- | sysdeps/mach/hurd/alpha/sigreturn.c | 211 |
1 files changed, 0 insertions, 211 deletions
diff --git a/sysdeps/mach/hurd/alpha/sigreturn.c b/sysdeps/mach/hurd/alpha/sigreturn.c deleted file mode 100644 index 182d4cbd84..0000000000 --- a/sysdeps/mach/hurd/alpha/sigreturn.c +++ /dev/null @@ -1,211 +0,0 @@ -/* Return from signal handler in GNU C library for Hurd. Alpha version. - Copyright (C) 1994,95,97,98,2002 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, write to the Free - Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA - 02111-1307 USA. */ - -#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; - 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); - - /* 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; - /* Clear the intr_port slot, since we are not in fact doing - an interruptible RPC right now. If SS->intr_port is not null, - the SCP context is doing an interruptible RPC, but the signal - thread will examine us while we are blocked in the sig_post RPC. */ - ss->intr_port = MACH_PORT_NULL; - __spin_unlock (&ss->lock); - __msg_sig_post (_hurd_msgport, 0, 0, __mach_task_self ()); - /* If a pending signal was handled, sig_post never returned. */ - __spin_lock (&ss->lock); - } - - 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_destroy (__mach_task_self (), *reply_port); - *reply_port = scp->sc_reply_port; - - if (scp->sc_used_fpa) - { - /* Restore FPU state. */ - - /* Restore the floating-point control/status register. - We must do this first because the compiler will need - a temporary FP register for the load. */ - asm volatile ("mt_fpcr %0" : : "f" (scp->sc_fpcsr)); - - /* Restore floating-point registers. */ -#define restore_fpr(n) \ - asm volatile ("ldt $f" #n ",%0" : : "m" (scp->sc_fpregs[n])) - restore_fpr (0); - restore_fpr (1); - restore_fpr (2); - restore_fpr (3); - restore_fpr (4); - restore_fpr (5); - restore_fpr (6); - restore_fpr (7); - restore_fpr (8); - restore_fpr (9); - restore_fpr (10); - restore_fpr (11); - restore_fpr (12); - restore_fpr (13); - restore_fpr (14); - restore_fpr (15); - restore_fpr (16); - restore_fpr (17); - restore_fpr (18); - restore_fpr (19); - restore_fpr (20); - restore_fpr (21); - restore_fpr (22); - restore_fpr (23); - restore_fpr (24); - restore_fpr (25); - restore_fpr (26); - restore_fpr (27); - restore_fpr (28); - restore_fpr (29); - restore_fpr (30); - } - - /* Load all the registers from the sigcontext. */ -#define restore_gpr(n) \ - asm volatile ("ldq $" #n ",%0" : : "m" (scpreg->sc_regs[n])) - - { - /* The `rei' PAL pseudo-instruction restores registers $2..$7, the PC - and processor status. So we can use these few registers for our - working variables. Unfortunately, it finds its data on the stack - and merely pops the SP ($30) over the words of state restored, - allowing no other option for the new SP value. So we must push the - registers and PSW it will to restore, onto the user's stack and let - it pop them from there. */ - register const struct sigcontext *const scpreg asm ("$2") = scp; - register integer_t *usp asm ("$3") = (integer_t *) scpreg->sc_regs[30]; - register integer_t usp_align asm ("$4"); - - /* Push an 8-word "trap frame" onto the user stack for `rei': - registers $2..$7, the PC, and the PSW. */ - - register struct rei_frame - { - integer_t regs[5], pc, ps; - } *rei_frame asm ("$5"); - - usp -= 8; - /* `rei' demands that the stack be aligned to a 64 byte (8 word) - boundary; bits 61..56 of the PSW are OR'd back into the SP value - after popping the 8-word trap frame, so we store (sp % 64) - there and this restores the original user SP. */ - usp_align = (integer_t) usp & 63L; - rei_frame = (void *) ((integer_t) usp & ~63L); - - /* Copy the registers and PC from the sigcontext. */ - memcpy (rei_frame->regs, &scpreg->sc_regs[2], sizeof rei_frame->regs); - rei_frame->pc = scpreg->sc_pc; - - /* Compute the new PS value to be restored. `rei' adds the value at - bits 61..56 to the SP to compensate for the alignment above that - cleared the low 6 bits; bits 5..3 are the new mode/privilege level - (must be >= current mode; 3 == user mode); bits 2..0 are "software", - unused by the processor or kernel (XXX should trampoline save these? - How?); in user mode, `rei' demands that all other bits be zero. */ - rei_frame->ps = (usp_align << 56) | (3 << 3); /* XXX low 3 bits??? */ - - /* Restore the other general registers: everything except $2..$7, which - are in the `rei' trap frame we set up above, and $30, which is the - SP which is popped by `rei'. */ - restore_gpr (1); - restore_gpr (8); - restore_gpr (9); - restore_gpr (10); - restore_gpr (11); - restore_gpr (12); - restore_gpr (13); - restore_gpr (14); - restore_gpr (15); - restore_gpr (16); - restore_gpr (17); - restore_gpr (18); - restore_gpr (19); - restore_gpr (20); - restore_gpr (21); - restore_gpr (22); - restore_gpr (23); - restore_gpr (24); - restore_gpr (25); - restore_gpr (26); - restore_gpr (27); - restore_gpr (28); - restore_gpr (29); - - /* Switch the stack pointer to the trap frame set up on - the user stack and do the magical `rei' PAL call. */ - asm volatile ("mov %0, $30\n" - "call_pal %1" - : : "r" (rei_frame), "i" (63)); /* PAL_rti */ - /* Firewall. */ - asm volatile ("halt"); - } - - /* NOTREACHED */ - return -1; -} - -weak_alias (__sigreturn, sigreturn) |