summaryrefslogtreecommitdiffstats
path: root/arch/tile/kernel/signal.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/tile/kernel/signal.c')
-rw-r--r--arch/tile/kernel/signal.c359
1 files changed, 359 insertions, 0 deletions
diff --git a/arch/tile/kernel/signal.c b/arch/tile/kernel/signal.c
new file mode 100644
index 00000000000..7ea85eb8524
--- /dev/null
+++ b/arch/tile/kernel/signal.c
@@ -0,0 +1,359 @@
+/*
+ * Copyright (C) 1991, 1992 Linus Torvalds
+ * Copyright 2010 Tilera Corporation. All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, version 2.
+ *
+ * This program 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, GOOD TITLE or
+ * NON INFRINGEMENT. See the GNU General Public License for
+ * more details.
+ */
+
+#include <linux/sched.h>
+#include <linux/mm.h>
+#include <linux/smp.h>
+#include <linux/smp_lock.h>
+#include <linux/kernel.h>
+#include <linux/signal.h>
+#include <linux/errno.h>
+#include <linux/wait.h>
+#include <linux/unistd.h>
+#include <linux/stddef.h>
+#include <linux/personality.h>
+#include <linux/suspend.h>
+#include <linux/ptrace.h>
+#include <linux/elf.h>
+#include <linux/compat.h>
+#include <linux/syscalls.h>
+#include <linux/uaccess.h>
+#include <asm/processor.h>
+#include <asm/ucontext.h>
+#include <asm/sigframe.h>
+#include <arch/interrupts.h>
+
+#define DEBUG_SIG 0
+
+#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
+
+
+/* Caller before callee in this file; other callee is in assembler */
+void do_signal(struct pt_regs *regs);
+
+int _sys_sigaltstack(const stack_t __user *uss,
+ stack_t __user *uoss, struct pt_regs *regs)
+{
+ return do_sigaltstack(uss, uoss, regs->sp);
+}
+
+
+/*
+ * Do a signal return; undo the signal stack.
+ */
+
+int restore_sigcontext(struct pt_regs *regs,
+ struct sigcontext __user *sc, long *pr0)
+{
+ int err = 0;
+ int i;
+
+ /* Always make any pending restarted system calls return -EINTR */
+ current_thread_info()->restart_block.fn = do_no_restart_syscall;
+
+ for (i = 0; i < sizeof(struct pt_regs)/sizeof(long); ++i)
+ err |= __get_user(((long *)regs)[i],
+ &((long *)(&sc->regs))[i]);
+
+ regs->faultnum = INT_SWINT_1_SIGRETURN;
+
+ err |= __get_user(*pr0, &sc->regs.regs[0]);
+ return err;
+}
+
+int _sys_rt_sigreturn(struct pt_regs *regs)
+{
+ struct rt_sigframe __user *frame =
+ (struct rt_sigframe __user *)(regs->sp);
+ sigset_t set;
+ long r0;
+
+ if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
+ goto badframe;
+ if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
+ goto badframe;
+
+ sigdelsetmask(&set, ~_BLOCKABLE);
+ spin_lock_irq(&current->sighand->siglock);
+ current->blocked = set;
+ recalc_sigpending();
+ spin_unlock_irq(&current->sighand->siglock);
+
+ if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &r0))
+ goto badframe;
+
+ if (do_sigaltstack(&frame->uc.uc_stack, NULL, regs->sp) == -EFAULT)
+ goto badframe;
+
+ return r0;
+
+badframe:
+ force_sig(SIGSEGV, current);
+ return 0;
+}
+
+/*
+ * Set up a signal frame.
+ */
+
+int setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs)
+{
+ int i, err = 0;
+
+ for (i = 0; i < sizeof(struct pt_regs)/sizeof(long); ++i)
+ err |= __put_user(((long *)regs)[i],
+ &((long *)(&sc->regs))[i]);
+
+ return err;
+}
+
+/*
+ * Determine which stack to use..
+ */
+static inline void __user *get_sigframe(struct k_sigaction *ka,
+ struct pt_regs *regs,
+ size_t frame_size)
+{
+ unsigned long sp;
+
+ /* Default to using normal stack */
+ sp = regs->sp;
+
+ /*
+ * If we are on the alternate signal stack and would overflow
+ * it, don't. Return an always-bogus address instead so we
+ * will die with SIGSEGV.
+ */
+ if (on_sig_stack(sp) && !likely(on_sig_stack(sp - frame_size)))
+ return (void __user *) -1L;
+
+ /* This is the X/Open sanctioned signal stack switching. */
+ if (ka->sa.sa_flags & SA_ONSTACK) {
+ if (sas_ss_flags(sp) == 0)
+ sp = current->sas_ss_sp + current->sas_ss_size;
+ }
+
+ sp -= frame_size;
+ /*
+ * Align the stack pointer according to the TILE ABI,
+ * i.e. so that on function entry (sp & 15) == 0.
+ */
+ sp &= -16UL;
+ return (void __user *) sp;
+}
+
+static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
+ sigset_t *set, struct pt_regs *regs)
+{
+ unsigned long restorer;
+ struct rt_sigframe __user *frame;
+ int err = 0;
+ int usig;
+
+ frame = get_sigframe(ka, regs, sizeof(*frame));
+
+ if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
+ goto give_sigsegv;
+
+ usig = current_thread_info()->exec_domain
+ && current_thread_info()->exec_domain->signal_invmap
+ && sig < 32
+ ? current_thread_info()->exec_domain->signal_invmap[sig]
+ : sig;
+
+ /* Always write at least the signal number for the stack backtracer. */
+ if (ka->sa.sa_flags & SA_SIGINFO) {
+ /* At sigreturn time, restore the callee-save registers too. */
+ err |= copy_siginfo_to_user(&frame->info, info);
+ regs->flags |= PT_FLAGS_RESTORE_REGS;
+ } else {
+ err |= __put_user(info->si_signo, &frame->info.si_signo);
+ }
+
+ /* Create the ucontext. */
+ err |= __clear_user(&frame->save_area, sizeof(frame->save_area));
+ err |= __put_user(0, &frame->uc.uc_flags);
+ err |= __put_user(0, &frame->uc.uc_link);
+ err |= __put_user((void *)(current->sas_ss_sp),
+ &frame->uc.uc_stack.ss_sp);
+ err |= __put_user(sas_ss_flags(regs->sp),
+ &frame->uc.uc_stack.ss_flags);
+ err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
+ err |= setup_sigcontext(&frame->uc.uc_mcontext, regs);
+ err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
+ if (err)
+ goto give_sigsegv;
+
+ restorer = VDSO_BASE;
+ if (ka->sa.sa_flags & SA_RESTORER)
+ restorer = (unsigned long) ka->sa.sa_restorer;
+
+ /*
+ * Set up registers for signal handler.
+ * Registers that we don't modify keep the value they had from
+ * user-space at the time we took the signal.
+ */
+ regs->pc = (unsigned long) ka->sa.sa_handler;
+ regs->ex1 = PL_ICS_EX1(USER_PL, 1); /* set crit sec in handler */
+ regs->sp = (unsigned long) frame;
+ regs->lr = restorer;
+ regs->regs[0] = (unsigned long) usig;
+
+ if (ka->sa.sa_flags & SA_SIGINFO) {
+ /* Need extra arguments, so mark to restore caller-saves. */
+ regs->regs[1] = (unsigned long) &frame->info;
+ regs->regs[2] = (unsigned long) &frame->uc;
+ regs->flags |= PT_FLAGS_CALLER_SAVES;
+ }
+
+ /*
+ * Notify any tracer that was single-stepping it.
+ * The tracer may want to single-step inside the
+ * handler too.
+ */
+ if (test_thread_flag(TIF_SINGLESTEP))
+ ptrace_notify(SIGTRAP);
+
+ return 0;
+
+give_sigsegv:
+ force_sigsegv(sig, current);
+ return -EFAULT;
+}
+
+/*
+ * OK, we're invoking a handler
+ */
+
+static int handle_signal(unsigned long sig, siginfo_t *info,
+ struct k_sigaction *ka, sigset_t *oldset,
+ struct pt_regs *regs)
+{
+ int ret;
+
+
+ /* Are we from a system call? */
+ if (regs->faultnum == INT_SWINT_1) {
+ /* If so, check system call restarting.. */
+ switch (regs->regs[0]) {
+ case -ERESTART_RESTARTBLOCK:
+ case -ERESTARTNOHAND:
+ regs->regs[0] = -EINTR;
+ break;
+
+ case -ERESTARTSYS:
+ if (!(ka->sa.sa_flags & SA_RESTART)) {
+ regs->regs[0] = -EINTR;
+ break;
+ }
+ /* fallthrough */
+ case -ERESTARTNOINTR:
+ /* Reload caller-saves to restore r0..r5 and r10. */
+ regs->flags |= PT_FLAGS_CALLER_SAVES;
+ regs->regs[0] = regs->orig_r0;
+ regs->pc -= 8;
+ }
+ }
+
+ /* Set up the stack frame */
+#ifdef CONFIG_COMPAT
+ if (is_compat_task())
+ ret = compat_setup_rt_frame(sig, ka, info, oldset, regs);
+ else
+#endif
+ ret = setup_rt_frame(sig, ka, info, oldset, regs);
+ if (ret == 0) {
+ /* This code is only called from system calls or from
+ * the work_pending path in the return-to-user code, and
+ * either way we can re-enable interrupts unconditionally.
+ */
+ spin_lock_irq(&current->sighand->siglock);
+ sigorsets(&current->blocked,
+ &current->blocked, &ka->sa.sa_mask);
+ if (!(ka->sa.sa_flags & SA_NODEFER))
+ sigaddset(&current->blocked, sig);
+ recalc_sigpending();
+ spin_unlock_irq(&current->sighand->siglock);
+ }
+
+ return ret;
+}
+
+/*
+ * Note that 'init' is a special process: it doesn't get signals it doesn't
+ * want to handle. Thus you cannot kill init even with a SIGKILL even by
+ * mistake.
+ */
+void do_signal(struct pt_regs *regs)
+{
+ siginfo_t info;
+ int signr;
+ struct k_sigaction ka;
+ sigset_t *oldset;
+
+ /*
+ * i386 will check if we're coming from kernel mode and bail out
+ * here. In my experience this just turns weird crashes into
+ * weird spin-hangs. But if we find a case where this seems
+ * helpful, we can reinstate the check on "!user_mode(regs)".
+ */
+
+ if (current_thread_info()->status & TS_RESTORE_SIGMASK)
+ oldset = &current->saved_sigmask;
+ else
+ oldset = &current->blocked;
+
+ signr = get_signal_to_deliver(&info, &ka, regs, NULL);
+ if (signr > 0) {
+ /* Whee! Actually deliver the signal. */
+ if (handle_signal(signr, &info, &ka, oldset, regs) == 0) {
+ /*
+ * A signal was successfully delivered; the saved
+ * sigmask will have been stored in the signal frame,
+ * and will be restored by sigreturn, so we can simply
+ * clear the TS_RESTORE_SIGMASK flag.
+ */
+ current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
+ }
+
+ return;
+ }
+
+ /* Did we come from a system call? */
+ if (regs->faultnum == INT_SWINT_1) {
+ /* Restart the system call - no handlers present */
+ switch (regs->regs[0]) {
+ case -ERESTARTNOHAND:
+ case -ERESTARTSYS:
+ case -ERESTARTNOINTR:
+ regs->flags |= PT_FLAGS_CALLER_SAVES;
+ regs->regs[0] = regs->orig_r0;
+ regs->pc -= 8;
+ break;
+
+ case -ERESTART_RESTARTBLOCK:
+ regs->flags |= PT_FLAGS_CALLER_SAVES;
+ regs->regs[TREG_SYSCALL_NR] = __NR_restart_syscall;
+ regs->pc -= 8;
+ break;
+ }
+ }
+
+ /* If there's no signal to deliver, just put the saved sigmask back. */
+ if (current_thread_info()->status & TS_RESTORE_SIGMASK) {
+ current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
+ sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);
+ }
+}