1 files changed, 552 insertions, 0 deletions

diff --git a/arch/h8300/kernel/signal.c b/arch/h8300/kernel/signal.c
new file mode 100644
index 000000000000..a4799d633ef4
--- /dev/null
+++ b/arch/h8300/kernel/signal.c
@@ -0,0 +1,552 @@
+/*
+ *  linux/arch/h8300/kernel/signal.c
+ *
+ *  Copyright (C) 1991, 1992  Linus Torvalds
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file COPYING in the main directory of this archive
+ * for more details.
+ */
+
+/*
+ * uClinux H8/300 support by Yoshinori Sato <ysato@users.sourceforge.jp>
+ *                and David McCullough <davidm@snapgear.com>
+ *
+ * Based on
+ * Linux/m68k by Hamish Macdonald
+ */
+
+/*
+ * ++roman (07/09/96): implemented signal stacks (specially for tosemu on
+ * Atari :-) Current limitation: Only one sigstack can be active at one time.
+ * If a second signal with SA_ONSTACK set arrives while working on a sigstack,
+ * SA_ONSTACK is ignored. This behaviour avoids lots of trouble with nested
+ * signal handlers!
+ */
+
+#include <linux/sched.h>
+#include <linux/mm.h>
+#include <linux/kernel.h>
+#include <linux/signal.h>
+#include <linux/syscalls.h>
+#include <linux/errno.h>
+#include <linux/wait.h>
+#include <linux/ptrace.h>
+#include <linux/unistd.h>
+#include <linux/stddef.h>
+#include <linux/highuid.h>
+#include <linux/personality.h>
+#include <linux/tty.h>
+#include <linux/binfmts.h>
+#include <linux/suspend.h>
+
+#include <asm/setup.h>
+#include <asm/uaccess.h>
+#include <asm/pgtable.h>
+#include <asm/traps.h>
+#include <asm/ucontext.h>
+
+#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
+
+asmlinkage int do_signal(struct pt_regs *regs, sigset_t *oldset);
+
+/*
+ * Atomically swap in the new signal mask, and wait for a signal.
+ */
+asmlinkage int do_sigsuspend(struct pt_regs *regs)
+{
+        old_sigset_t mask = regs->er3;
+        sigset_t saveset;
+
+        mask &= _BLOCKABLE;
+        spin_lock_irq(&current->sighand->siglock);
+        saveset = current->blocked;
+        siginitset(&current->blocked, mask);
+        recalc_sigpending();
+        spin_unlock_irq(&current->sighand->siglock);
+
+        regs->er0 = -EINTR;
+        while (1) {
+                current->state = TASK_INTERRUPTIBLE;
+                schedule();
+                if (do_signal(regs, &saveset))
+                        return -EINTR;
+        }
+}
+
+asmlinkage int
+do_rt_sigsuspend(struct pt_regs *regs)
+{
+        sigset_t *unewset = (sigset_t *)regs->er1;
+        size_t sigsetsize = (size_t)regs->er2;
+        sigset_t saveset, newset;
+
+        /* XXX: Don't preclude handling different sized sigset_t's.  */
+        if (sigsetsize != sizeof(sigset_t))
+                return -EINVAL;
+
+        if (copy_from_user(&newset, unewset, sizeof(newset)))
+                return -EFAULT;
+        sigdelsetmask(&newset, ~_BLOCKABLE);
+
+        spin_lock_irq(&current->sighand->siglock);
+        saveset = current->blocked;
+        current->blocked = newset;
+        recalc_sigpending();
+        spin_unlock_irq(&current->sighand->siglock);
+
+        regs->er0 = -EINTR;
+        while (1) {
+                current->state = TASK_INTERRUPTIBLE;
+                schedule();
+                if (do_signal(regs, &saveset))
+                        return -EINTR;
+        }
+}
+
+asmlinkage int 
+sys_sigaction(int sig, const struct old_sigaction *act,
+              struct old_sigaction *oact)
+{
+        struct k_sigaction new_ka, old_ka;
+        int ret;
+
+        if (act) {
+                old_sigset_t mask;
+                if (!access_ok(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 (!access_ok(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;
+}
+
+asmlinkage int
+sys_sigaltstack(const stack_t *uss, stack_t *uoss)
+{
+        return do_sigaltstack(uss, uoss, rdusp());
+}
+
+
+/*
+ * Do a signal return; undo the signal stack.
+ *
+ * Keep the return code on the stack quadword aligned!
+ * That makes the cache flush below easier.
+ */
+
+struct sigframe
+{
+        long dummy_er0;
+        long dummy_vector;
+#if defined(CONFIG_CPU_H8S)
+        short dummy_exr;
+#endif
+        long dummy_pc;
+        char *pretcode;
+        unsigned char retcode[8];
+        unsigned long extramask[_NSIG_WORDS-1];
+        struct sigcontext sc;
+        int sig;
+} __attribute__((aligned(2),packed));
+
+struct rt_sigframe
+{
+        long dummy_er0;
+        long dummy_vector;
+#if defined(CONFIG_CPU_H8S)
+        short dummy_exr;
+#endif
+        long dummy_pc;
+        char *pretcode;
+        struct siginfo *pinfo;
+        void *puc;
+        unsigned char retcode[8];
+        struct siginfo info;
+        struct ucontext uc;
+        int sig;
+} __attribute__((aligned(2),packed));
+
+static inline int
+restore_sigcontext(struct pt_regs *regs, struct sigcontext *usc,
+                   int *pd0)
+{
+        int err = 0;
+        unsigned int ccr;
+        unsigned int usp;
+        unsigned int er0;
+
+        /* Always make any pending restarted system calls return -EINTR */
+        current_thread_info()->restart_block.fn = do_no_restart_syscall;
+
+#define COPY(r) err |= __get_user(regs->r, &usc->sc_##r)    /* restore passed registers */
+        COPY(er1);
+        COPY(er2);
+        COPY(er3);
+        COPY(er5);
+        COPY(pc);
+        ccr = regs->ccr & 0x10;
+        COPY(ccr);
+#undef COPY
+        regs->ccr &= 0xef;
+        regs->ccr |= ccr;
+        regs->orig_er0 = -1;            /* disable syscall checks */
+        err |= __get_user(usp, &usc->sc_usp);
+        wrusp(usp);
+
+        err |= __get_user(er0, &usc->sc_er0);
+        *pd0 = er0;
+        return err;
+}
+
+asmlinkage int do_sigreturn(unsigned long __unused,...)
+{
+        struct pt_regs *regs = (struct pt_regs *) (&__unused - 1);
+        unsigned long usp = rdusp();
+        struct sigframe *frame = (struct sigframe *)(usp - 4);
+        sigset_t set;
+        int er0;
+
+        if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
+                goto badframe;
+        if (__get_user(set.sig[0], &frame->sc.sc_mask) ||
+            (_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(regs, &frame->sc, &er0))
+                goto badframe;
+        return er0;
+
+badframe:
+        force_sig(SIGSEGV, current);
+        return 0;
+}
+
+asmlinkage int do_rt_sigreturn(unsigned long __unused,...)
+{
+        struct pt_regs *regs = (struct pt_regs *) &__unused;
+        unsigned long usp = rdusp();
+        struct rt_sigframe *frame = (struct rt_sigframe *)(usp - 4);
+        sigset_t set;
+        int er0;
+
+        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_unlock_irq(&current->sighand->siglock);
+        current->blocked = set;
+        recalc_sigpending();
+        spin_lock_irq(&current->sighand->siglock);
+        
+        if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &er0))
+                goto badframe;
+
+        if (do_sigaltstack(&frame->uc.uc_stack, NULL, usp) == -EFAULT)
+                goto badframe;
+
+        return er0;
+
+badframe:
+        force_sig(SIGSEGV, current);
+        return 0;
+}
+
+static int setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs,
+                             unsigned long mask)
+{
+        int err = 0;
+
+        err |= __put_user(regs->er0, &sc->sc_er0);
+        err |= __put_user(regs->er1, &sc->sc_er1);
+        err |= __put_user(regs->er2, &sc->sc_er2);
+        err |= __put_user(regs->er3, &sc->sc_er3);
+        err |= __put_user(regs->er4, &sc->sc_er4);
+        err |= __put_user(regs->er5, &sc->sc_er5);
+        err |= __put_user(regs->er6, &sc->sc_er6);
+        err |= __put_user(rdusp(),   &sc->sc_usp);
+        err |= __put_user(regs->pc,  &sc->sc_pc);
+        err |= __put_user(regs->ccr, &sc->sc_ccr);
+        err |= __put_user(mask,      &sc->sc_mask);
+
+        return err;
+}
+
+static inline void *
+get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size)
+{
+        unsigned long usp;
+
+        /* Default to using normal stack.  */
+        usp = rdusp();
+
+        /* This is the X/Open sanctioned signal stack switching.  */
+        if (ka->sa.sa_flags & SA_ONSTACK) {
+                if (!on_sig_stack(usp))
+                        usp = current->sas_ss_sp + current->sas_ss_size;
+        }
+        return (void *)((usp - frame_size) & -8UL);
+}
+
+static void setup_frame (int sig, struct k_sigaction *ka,
+                         sigset_t *set, struct pt_regs *regs)
+{
+        struct sigframe *frame;
+        int err = 0;
+        int usig;
+        unsigned char *ret;
+
+        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;
+
+        err |= __put_user(usig, &frame->sig);
+        if (err)
+                goto give_sigsegv;
+
+        err |= setup_sigcontext(&frame->sc, regs, set->sig[0]);
+        if (err)
+                goto give_sigsegv;
+
+        if (_NSIG_WORDS > 1) {
+                err |= copy_to_user(frame->extramask, &set->sig[1],
+                                    sizeof(frame->extramask));
+                if (err)
+                        goto give_sigsegv;
+        }
+
+        ret = frame->retcode;
+        if (ka->sa.sa_flags & SA_RESTORER)
+                ret = (unsigned char *)(ka->sa.sa_restorer);
+        else {
+                /* sub.l er0,er0; mov.b #__NR_sigreturn,r0l; trapa #0 */
+                err != __put_user(0x1a80f800 + (__NR_sigreturn & 0xff),
+                                  (unsigned long *)(frame->retcode + 0));
+                err |= __put_user(0x5700, (unsigned short *)(frame->retcode + 4));
+        }
+
+        /* Set up to return from userspace.  */
+        err |= __put_user(ret, &frame->pretcode);
+
+        if (err)
+                goto give_sigsegv;
+
+        /* Set up registers for signal handler */
+        wrusp ((unsigned long) frame);
+        regs->pc = (unsigned long) ka->sa.sa_handler;
+        regs->er0 = (current_thread_info()->exec_domain
+                           && current_thread_info()->exec_domain->signal_invmap
+                           && sig < 32
+                           ? current_thread_info()->exec_domain->signal_invmap[sig]
+                          : sig);
+        regs->er1 = (unsigned long)&(frame->sc);
+        regs->er5 = current->mm->start_data;    /* GOT base */
+
+        return;
+
+give_sigsegv:
+        force_sigsegv(sig, current);
+}
+
+static void setup_rt_frame (int sig, struct k_sigaction *ka, siginfo_t *info,
+                            sigset_t *set, struct pt_regs *regs)
+{
+        struct rt_sigframe *frame;
+        int err = 0;
+        int usig;
+        unsigned char *ret;
+
+        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;
+
+        err |= __put_user(usig, &frame->sig);
+        if (err)
+                goto give_sigsegv;
+
+        err |= __put_user(&frame->info, &frame->pinfo);
+        err |= __put_user(&frame->uc, &frame->puc);
+        err |= copy_siginfo_to_user(&frame->info, info);
+        if (err)
+                goto give_sigsegv;
+
+        /* Create the ucontext.  */
+        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(rdusp()),
+                          &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, set->sig[0]);
+        err |= copy_to_user (&frame->uc.uc_sigmask, set, sizeof(*set));
+        if (err)
+                goto give_sigsegv;
+
+        /* Set up to return from userspace.  */
+        ret = frame->retcode;
+        if (ka->sa.sa_flags & SA_RESTORER)
+                ret = (unsigned char *)(ka->sa.sa_restorer);
+        else {
+                /* sub.l er0,er0; mov.b #__NR_sigreturn,r0l; trapa #0 */
+                err != __put_user(0x1a80f800 + (__NR_sigreturn & 0xff),
+                                  (unsigned long *)(frame->retcode + 0));
+                err |= __put_user(0x5700, (unsigned short *)(frame->retcode + 4));
+        }
+        err |= __put_user(ret, &frame->pretcode);
+
+        if (err)
+                goto give_sigsegv;
+
+        /* Set up registers for signal handler */
+        wrusp ((unsigned long) frame);
+        regs->pc  = (unsigned long) ka->sa.sa_handler;
+        regs->er0 = (current_thread_info()->exec_domain
+                     && current_thread_info()->exec_domain->signal_invmap
+                     && sig < 32
+                     ? current_thread_info()->exec_domain->signal_invmap[sig]
+                     : sig);
+        regs->er1 = (unsigned long)&(frame->info);
+        regs->er2 = (unsigned long)&frame->uc;
+        regs->er5 = current->mm->start_data;    /* GOT base */
+
+        return;
+
+give_sigsegv:
+        force_sigsegv(sig, current);
+}
+
+/*
+ * OK, we're invoking a handler
+ */
+static void
+handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka,
+              sigset_t *oldset, struct pt_regs * regs)
+{
+        /* are we from a system call? */
+        if (regs->orig_er0 >= 0) {
+                switch (regs->er0) {
+                        case -ERESTART_RESTARTBLOCK:
+                        case -ERESTARTNOHAND:
+                                regs->er0 = -EINTR;
+                                break;
+
+                        case -ERESTARTSYS:
+                                if (!(ka->sa.sa_flags & SA_RESTART)) {
+                                        regs->er0 = -EINTR;
+                                        break;
+                                }
+                        /* fallthrough */
+                        case -ERESTARTNOINTR:
+                                regs->er0 = regs->orig_er0;
+                                regs->pc -= 2;
+                }
+        }
+
+        /* set up the stack frame */
+        if (ka->sa.sa_flags & SA_SIGINFO)
+                setup_rt_frame(sig, ka, info, oldset, regs);
+        else
+                setup_frame(sig, ka, oldset, regs);
+
+        if (!(ka->sa.sa_flags & SA_NODEFER)) {
+                spin_lock_irq(&current->sighand->siglock);
+                sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
+                sigaddset(&current->blocked,sig);
+                recalc_sigpending();
+                spin_unlock_irq(&current->sighand->siglock);
+        }
+}
+
+/*
+ * 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.
+ */
+asmlinkage int do_signal(struct pt_regs *regs, sigset_t *oldset)
+{
+        siginfo_t info;
+        int signr;
+        struct k_sigaction ka;
+
+        /*
+         * We want the common case to go fast, which
+         * is why we may in certain cases get here from
+         * kernel mode. Just return without doing anything
+         * if so.
+         */
+        if ((regs->ccr & 0x10))
+                return 1;
+
+        if (current->flags & PF_FREEZE) {
+                refrigerator(0);
+                goto no_signal;
+        }
+
+        current->thread.esp0 = (unsigned long) regs;
+
+        if (!oldset)
+                oldset = &current->blocked;
+
+        signr = get_signal_to_deliver(&info, &ka, regs, NULL);
+        if (signr > 0) {
+                /* Whee!  Actually deliver the signal.  */
+                handle_signal(signr, &info, &ka, oldset, regs);
+                return 1;
+        }
+ no_signal:
+        /* Did we come from a system call? */
+        if (regs->orig_er0 >= 0) {
+                /* Restart the system call - no handlers present */
+                if (regs->er0 == -ERESTARTNOHAND ||
+                    regs->er0 == -ERESTARTSYS ||
+                    regs->er0 == -ERESTARTNOINTR) {
+                        regs->er0 = regs->orig_er0;
+                        regs->pc -= 2;
+                }
+                if (regs->er0 == -ERESTART_RESTARTBLOCK){
+                        regs->er0 = __NR_restart_syscall;
+                        regs->pc -= 2;
+                }
+        }
+        return 0;
+}