1 files changed, 564 insertions, 0 deletions

diff --git a/arch/mn10300/kernel/signal.c b/arch/mn10300/kernel/signal.c
new file mode 100644
index 000000000000..841ca9955a18
--- /dev/null
+++ b/arch/mn10300/kernel/signal.c
@@ -0,0 +1,564 @@
+/* MN10300 Signal handling
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public Licence
+ * as published by the Free Software Foundation; either version
+ * 2 of the Licence, or (at your option) any later version.
+ */
+
+#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/ptrace.h>
+#include <linux/unistd.h>
+#include <linux/stddef.h>
+#include <linux/tty.h>
+#include <linux/personality.h>
+#include <linux/suspend.h>
+#include <asm/cacheflush.h>
+#include <asm/ucontext.h>
+#include <asm/uaccess.h>
+#include <asm/fpu.h>
+#include "sigframe.h"
+
+#define DEBUG_SIG 0
+
+#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
+
+/*
+ * atomically swap in the new signal mask, and wait for a signal.
+ */
+asmlinkage long sys_sigsuspend(int history0, int history1, old_sigset_t mask)
+{
+        mask &= _BLOCKABLE;
+        spin_lock_irq(&current->sighand->siglock);
+        current->saved_sigmask = current->blocked;
+        siginitset(&current->blocked, mask);
+        recalc_sigpending();
+        spin_unlock_irq(&current->sighand->siglock);
+
+        current->state = TASK_INTERRUPTIBLE;
+        schedule();
+        set_thread_flag(TIF_RESTORE_SIGMASK);
+        return -ERESTARTNOHAND;
+}
+
+/*
+ * set signal action syscall
+ */
+asmlinkage long sys_sigaction(int sig,
+                              const struct old_sigaction __user *act,
+                              struct old_sigaction __user *oact)
+{
+        struct k_sigaction new_ka, old_ka;
+        int ret;
+
+        if (act) {
+                old_sigset_t mask;
+                if (verify_area(VERIFY_READ, act, sizeof(*act)) ||
+                    __get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
+                    __get_user(new_ka.sa.sa_restorer, &act->sa_restorer))
+                        return -EFAULT;
+                __get_user(new_ka.sa.sa_flags, &act->sa_flags);
+                __get_user(mask, &act->sa_mask);
+                siginitset(&new_ka.sa.sa_mask, mask);
+        }
+
+        ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
+
+        if (!ret && oact) {
+                if (verify_area(VERIFY_WRITE, oact, sizeof(*oact)) ||
+                    __put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
+                    __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer))
+                        return -EFAULT;
+                __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
+                __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
+        }
+
+        return ret;
+}
+
+/*
+ * set alternate signal stack syscall
+ */
+asmlinkage long sys_sigaltstack(const stack_t __user *uss, stack_t *uoss)
+{
+        return do_sigaltstack(uss, uoss, __frame->sp);
+}
+
+/*
+ * do a signal return; undo the signal stack.
+ */
+static int restore_sigcontext(struct pt_regs *regs,
+                              struct sigcontext __user *sc, long *_d0)
+{
+        unsigned int err = 0;
+
+        if (is_using_fpu(current))
+                fpu_kill_state(current);
+
+#define COPY(x) err |= __get_user(regs->x, &sc->x)
+        COPY(d1); COPY(d2); COPY(d3);
+        COPY(a0); COPY(a1); COPY(a2); COPY(a3);
+        COPY(e0); COPY(e1); COPY(e2); COPY(e3);
+        COPY(e4); COPY(e5); COPY(e6); COPY(e7);
+        COPY(lar); COPY(lir);
+        COPY(mdr); COPY(mdrq);
+        COPY(mcvf); COPY(mcrl); COPY(mcrh);
+        COPY(sp); COPY(pc);
+#undef COPY
+
+        {
+                unsigned int tmpflags;
+#ifndef CONFIG_MN10300_USING_JTAG
+#define USER_EPSW (EPSW_FLAG_Z | EPSW_FLAG_N | EPSW_FLAG_C | EPSW_FLAG_V | \
+                   EPSW_T | EPSW_nAR)
+#else
+#define USER_EPSW (EPSW_FLAG_Z | EPSW_FLAG_N | EPSW_FLAG_C | EPSW_FLAG_V | \
+                   EPSW_nAR)
+#endif
+                err |= __get_user(tmpflags, &sc->epsw);
+                regs->epsw = (regs->epsw & ~USER_EPSW) |
+                  (tmpflags & USER_EPSW);
+                regs->orig_d0 = -1;             /* disable syscall checks */
+        }
+
+        {
+                struct fpucontext *buf;
+                err |= __get_user(buf, &sc->fpucontext);
+                if (buf) {
+                        if (verify_area(VERIFY_READ, buf, sizeof(*buf)))
+                                goto badframe;
+                        err |= fpu_restore_sigcontext(buf);
+                }
+        }
+
+        err |= __get_user(*_d0, &sc->d0);
+        return err;
+
+badframe:
+        return 1;
+}
+
+/*
+ * standard signal return syscall
+ */
+asmlinkage long sys_sigreturn(void)
+{
+        struct sigframe __user *frame = (struct sigframe __user *) __frame->sp;
+        sigset_t set;
+        long d0;
+
+        if (verify_area(VERIFY_READ, frame, sizeof(*frame)))
+                goto badframe;
+        if (__get_user(set.sig[0], &frame->sc.oldmask))
+                goto badframe;
+
+        if (_NSIG_WORDS > 1 &&
+            __copy_from_user(&set.sig[1], &frame->extramask,
+                             sizeof(frame->extramask)))
+                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(__frame, &frame->sc, &d0))
+                goto badframe;
+
+        return d0;
+
+badframe:
+        force_sig(SIGSEGV, current);
+        return 0;
+}
+
+/*
+ * realtime signal return syscall
+ */
+asmlinkage long sys_rt_sigreturn(void)
+{
+        struct rt_sigframe __user *frame =
+                (struct rt_sigframe __user *) __frame->sp;
+        sigset_t set;
+        unsigned long d0;
+
+        if (verify_area(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(__frame, &frame->uc.uc_mcontext, &d0))
+                goto badframe;
+
+        if (do_sigaltstack(&frame->uc.uc_stack, NULL, __frame->sp) == -EFAULT)
+                goto badframe;
+
+        return d0;
+
+badframe:
+        force_sig(SIGSEGV, current);
+        return 0;
+}
+
+/*
+ * store the userspace context into a signal frame
+ */
+static int setup_sigcontext(struct sigcontext __user *sc,
+                            struct fpucontext *fpuctx,
+                            struct pt_regs *regs,
+                            unsigned long mask)
+{
+        int tmp, err = 0;
+
+#define COPY(x) err |= __put_user(regs->x, &sc->x)
+        COPY(d0); COPY(d1); COPY(d2); COPY(d3);
+        COPY(a0); COPY(a1); COPY(a2); COPY(a3);
+        COPY(e0); COPY(e1); COPY(e2); COPY(e3);
+        COPY(e4); COPY(e5); COPY(e6); COPY(e7);
+        COPY(lar); COPY(lir);
+        COPY(mdr); COPY(mdrq);
+        COPY(mcvf); COPY(mcrl); COPY(mcrh);
+        COPY(sp); COPY(epsw); COPY(pc);
+#undef COPY
+
+        tmp = fpu_setup_sigcontext(fpuctx);
+        if (tmp < 0)
+                err = 1;
+        else
+                err |= __put_user(tmp ? fpuctx : NULL, &sc->fpucontext);
+
+        /* non-iBCS2 extensions.. */
+        err |= __put_user(mask, &sc->oldmask);
+
+        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;
+
+        /* this is the X/Open sanctioned signal stack switching.  */
+        if (ka->sa.sa_flags & SA_ONSTACK) {
+                if (!on_sig_stack(sp))
+                        sp = current->sas_ss_sp + current->sas_ss_size;
+        }
+
+        return (void __user *) ((sp - frame_size) & ~7UL);
+}
+
+/*
+ * set up a normal signal frame
+ */
+static int setup_frame(int sig, struct k_sigaction *ka, sigset_t *set,
+                       struct pt_regs *regs)
+{
+        struct sigframe __user *frame;
+        int rsig;
+
+        frame = get_sigframe(ka, regs, sizeof(*frame));
+
+        if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
+                goto give_sigsegv;
+
+        rsig = sig;
+        if (sig < 32 &&
+            current_thread_info()->exec_domain &&
+            current_thread_info()->exec_domain->signal_invmap)
+                rsig = current_thread_info()->exec_domain->signal_invmap[sig];
+
+        if (__put_user(rsig, &frame->sig) < 0 ||
+            __put_user(&frame->sc, &frame->psc) < 0)
+                goto give_sigsegv;
+
+        if (setup_sigcontext(&frame->sc, &frame->fpuctx, regs, set->sig[0]))
+                goto give_sigsegv;
+
+        if (_NSIG_WORDS > 1) {
+                if (__copy_to_user(frame->extramask, &set->sig[1],
+                                   sizeof(frame->extramask)))
+                        goto give_sigsegv;
+        }
+
+        /* set up to return from userspace.  If provided, use a stub already in
+         * userspace */
+        if (ka->sa.sa_flags & SA_RESTORER) {
+                if (__put_user(ka->sa.sa_restorer, &frame->pretcode))
+                        goto give_sigsegv;
+        } else {
+                if (__put_user((void (*)(void))frame->retcode,
+                               &frame->pretcode))
+                        goto give_sigsegv;
+                /* this is mov $,d0; syscall 0 */
+                if (__put_user(0x2c, (char *)(frame->retcode + 0)) ||
+                    __put_user(__NR_sigreturn, (char *)(frame->retcode + 1)) ||
+                    __put_user(0x00, (char *)(frame->retcode + 2)) ||
+                    __put_user(0xf0, (char *)(frame->retcode + 3)) ||
+                    __put_user(0xe0, (char *)(frame->retcode + 4)))
+                        goto give_sigsegv;
+                flush_icache_range((unsigned long) frame->retcode,
+                                   (unsigned long) frame->retcode + 5);
+        }
+
+        /* set up registers for signal handler */
+        regs->sp = (unsigned long) frame;
+        regs->pc = (unsigned long) ka->sa.sa_handler;
+        regs->d0 = sig;
+        regs->d1 = (unsigned long) &frame->sc;
+
+        set_fs(USER_DS);
+
+        /* the tracer may want to single-step inside the handler */
+        if (test_thread_flag(TIF_SINGLESTEP))
+                ptrace_notify(SIGTRAP);
+
+#if DEBUG_SIG
+        printk(KERN_DEBUG "SIG deliver %d (%s:%d): sp=%p pc=%lx ra=%p\n",
+               sig, current->comm, current->pid, frame, regs->pc,
+               frame->pretcode);
+#endif
+
+        return 0;
+
+give_sigsegv:
+        force_sig(SIGSEGV, current);
+        return -EFAULT;
+}
+
+/*
+ * set up a realtime signal frame
+ */
+static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
+                          sigset_t *set, struct pt_regs *regs)
+{
+        struct rt_sigframe __user *frame;
+        int rsig;
+
+        frame = get_sigframe(ka, regs, sizeof(*frame));
+
+        if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
+                goto give_sigsegv;
+
+        rsig = sig;
+        if (sig < 32 &&
+            current_thread_info()->exec_domain &&
+            current_thread_info()->exec_domain->signal_invmap)
+                rsig = current_thread_info()->exec_domain->signal_invmap[sig];
+
+        if (__put_user(rsig, &frame->sig) ||
+            __put_user(&frame->info, &frame->pinfo) ||
+            __put_user(&frame->uc, &frame->puc) ||
+            copy_siginfo_to_user(&frame->info, info))
+                goto give_sigsegv;
+
+        /* create the ucontext.  */
+        if (__put_user(0, &frame->uc.uc_flags) ||
+            __put_user(0, &frame->uc.uc_link) ||
+            __put_user((void *)current->sas_ss_sp, &frame->uc.uc_stack.ss_sp) ||
+            __put_user(sas_ss_flags(regs->sp), &frame->uc.uc_stack.ss_flags) ||
+            __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size) ||
+            setup_sigcontext(&frame->uc.uc_mcontext,
+                             &frame->fpuctx, regs, set->sig[0]) ||
+            __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)))
+                goto give_sigsegv;
+
+        /* set up to return from userspace.  If provided, use a stub already in
+         * userspace */
+        if (ka->sa.sa_flags & SA_RESTORER) {
+                if (__put_user(ka->sa.sa_restorer, &frame->pretcode))
+                        goto give_sigsegv;
+        } else {
+                if (__put_user((void(*)(void))frame->retcode,
+                               &frame->pretcode) ||
+                    /* This is mov $,d0; syscall 0 */
+                    __put_user(0x2c, (char *)(frame->retcode + 0)) ||
+                    __put_user(__NR_rt_sigreturn,
+                               (char *)(frame->retcode + 1)) ||
+                    __put_user(0x00, (char *)(frame->retcode + 2)) ||
+                    __put_user(0xf0, (char *)(frame->retcode + 3)) ||
+                    __put_user(0xe0, (char *)(frame->retcode + 4)))
+                        goto give_sigsegv;
+
+                flush_icache_range((u_long) frame->retcode,
+                                   (u_long) frame->retcode + 5);
+        }
+
+        /* Set up registers for signal handler */
+        regs->sp = (unsigned long) frame;
+        regs->pc = (unsigned long) ka->sa.sa_handler;
+        regs->d0 = sig;
+        regs->d1 = (long) &frame->info;
+
+        set_fs(USER_DS);
+
+        /* the tracer may want to single-step inside the handler */
+        if (test_thread_flag(TIF_SINGLESTEP))
+                ptrace_notify(SIGTRAP);
+
+#if DEBUG_SIG
+        printk(KERN_DEBUG "SIG deliver %d (%s:%d): sp=%p pc=%lx ra=%p\n",
+               sig, current->comm, current->pid, frame, regs->pc,
+               frame->pretcode);
+#endif
+
+        return 0;
+
+give_sigsegv:
+        force_sig(SIGSEGV, current);
+        return -EFAULT;
+}
+
+/*
+ * handle the actual delivery of a signal to userspace
+ */
+static int handle_signal(int 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->orig_d0 >= 0) {
+                /* If so, check system call restarting.. */
+                switch (regs->d0) {
+                case -ERESTART_RESTARTBLOCK:
+                case -ERESTARTNOHAND:
+                        regs->d0 = -EINTR;
+                        break;
+
+                case -ERESTARTSYS:
+                        if (!(ka->sa.sa_flags & SA_RESTART)) {
+                                regs->d0 = -EINTR;
+                                break;
+                        }
+
+                        /* fallthrough */
+                case -ERESTARTNOINTR:
+                        regs->d0 = regs->orig_d0;
+                        regs->pc -= 2;
+                }
+        }
+
+        /* Set up the stack frame */
+        if (ka->sa.sa_flags & SA_SIGINFO)
+                ret = setup_rt_frame(sig, ka, info, oldset, regs);
+        else
+                ret = setup_frame(sig, ka, oldset, regs);
+
+        if (ret == 0) {
+                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;
+}
+
+/*
+ * handle a potential signal
+ */
+static void do_signal(struct pt_regs *regs)
+{
+        struct k_sigaction ka;
+        siginfo_t info;
+        sigset_t *oldset;
+        int signr;
+
+        /* we want the common case to go fast, which is why we may in certain
+         * cases get here from kernel mode */
+        if (!user_mode(regs))
+                return;
+
+        if (test_thread_flag(TIF_RESTORE_SIGMASK))
+                oldset = &current->saved_sigmask;
+        else
+                oldset = &current->blocked;
+
+        signr = get_signal_to_deliver(&info, &ka, regs, NULL);
+        if (signr > 0) {
+                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 TIF_RESTORE_SIGMASK flag */
+                        if (test_thread_flag(TIF_RESTORE_SIGMASK))
+                                clear_thread_flag(TIF_RESTORE_SIGMASK);
+                }
+
+                return;
+        }
+
+        /* did we come from a system call? */
+        if (regs->orig_d0 >= 0) {
+                /* restart the system call - no handlers present */
+                switch (regs->d0) {
+                case -ERESTARTNOHAND:
+                case -ERESTARTSYS:
+                case -ERESTARTNOINTR:
+                        regs->d0 = regs->orig_d0;
+                        regs->pc -= 2;
+                        break;
+
+                case -ERESTART_RESTARTBLOCK:
+                        regs->d0 = __NR_restart_syscall;
+                        regs->pc -= 2;
+                        break;
+                }
+        }
+
+        /* if there's no signal to deliver, we just put the saved sigmask
+         * back */
+        if (test_thread_flag(TIF_RESTORE_SIGMASK)) {
+                clear_thread_flag(TIF_RESTORE_SIGMASK);
+                sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);
+        }
+}
+
+/*
+ * notification of userspace execution resumption
+ * - triggered by current->work.notify_resume
+ */
+asmlinkage void do_notify_resume(struct pt_regs *regs, u32 thread_info_flags)
+{
+        /* Pending single-step? */
+        if (thread_info_flags & _TIF_SINGLESTEP) {
+#ifndef CONFIG_MN10300_USING_JTAG
+                regs->epsw |= EPSW_T;
+                clear_thread_flag(TIF_SINGLESTEP);
+#else
+                BUG(); /* no h/w single-step if using JTAG unit */
+#endif
+        }
+
+        /* deal with pending signal delivery */
+        if (thread_info_flags & (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK))
+                do_signal(regs);
+}