1 files changed, 438 insertions, 0 deletions

diff --git a/arch/m32r/kernel/signal.c b/arch/m32r/kernel/signal.c
new file mode 100644
index 000000000000..50311eb07a24
--- /dev/null
+++ b/arch/m32r/kernel/signal.c
@@ -0,0 +1,438 @@
+/*
+ *  linux/arch/m32r/kernel/signal.c
+ *
+ *  Copyright (c) 2003  Hitoshi Yamamoto
+ *
+ *  Taken from i386 version.
+ *  Copyright (C) 1991, 1992  Linus Torvalds
+ *
+ *  1997-11-28  Modified for POSIX.1b signals by Richard Henderson
+ *  2000-06-20  Pentium III FXSR, SSE support by Gareth Hughes
+ */
+
+#include <linux/config.h>
+#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 <asm/cacheflush.h>
+#include <asm/ucontext.h>
+#include <asm/uaccess.h>
+
+#define DEBUG_SIG 0
+
+#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
+
+int do_signal(struct pt_regs *, sigset_t *);
+
+asmlinkage int
+sys_rt_sigsuspend(sigset_t *unewset, size_t sigsetsize,
+                  unsigned long r2, unsigned long r3, unsigned long r4,
+                  unsigned long r5, unsigned long r6, struct pt_regs regs)
+{
+        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.r0 = -EINTR;
+        while (1) {
+                current->state = TASK_INTERRUPTIBLE;
+                schedule();
+                if (do_signal(&regs, &saveset))
+                        return regs.r0;
+        }
+}
+
+asmlinkage int
+sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss,
+                unsigned long r2, unsigned long r3, unsigned long r4,
+                unsigned long r5, unsigned long r6, struct pt_regs regs)
+{
+        return do_sigaltstack(uss, uoss, regs.spu);
+}
+
+
+/*
+ * Do a signal return; undo the signal stack.
+ */
+
+struct rt_sigframe
+{
+        int sig;
+        struct siginfo *pinfo;
+        void *puc;
+        struct siginfo info;
+        struct ucontext uc;
+//      struct _fpstate fpstate;
+};
+
+static int
+restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc,
+                   int *r0_p)
+{
+        unsigned int err = 0;
+
+        /* Always make any pending restarted system calls return -EINTR */
+        current_thread_info()->restart_block.fn = do_no_restart_syscall;
+
+#define COPY(x)         err |= __get_user(regs->x, &sc->sc_##x)
+        COPY(r4);
+        COPY(r5);
+        COPY(r6);
+        COPY(pt_regs);
+        /* COPY(r0); Skip r0 */
+        COPY(r1);
+        COPY(r2);
+        COPY(r3);
+        COPY(r7);
+        COPY(r8);
+        COPY(r9);
+        COPY(r10);
+        COPY(r11);
+        COPY(r12);
+#if defined(CONFIG_ISA_M32R2) && defined(CONFIG_ISA_DSP_LEVEL2)
+        COPY(acc0h);
+        COPY(acc0l);
+        COPY(acc1h);
+        COPY(acc1l);
+#elif defined(CONFIG_ISA_M32R2) || defined(CONFIG_ISA_M32R)
+        COPY(acch);
+        COPY(accl);
+#else
+#error unknown isa configuration
+#endif
+        COPY(psw);
+        COPY(bpc);
+        COPY(bbpsw);
+        COPY(bbpc);
+        COPY(spu);
+        COPY(fp);
+        COPY(lr);
+        COPY(spi);
+#undef COPY
+
+        regs->syscall_nr = -1;  /* disable syscall checks */
+        err |= __get_user(*r0_p, &sc->sc_r0);
+
+        return err;
+}
+
+asmlinkage int
+sys_rt_sigreturn(unsigned long r0, unsigned long r1,
+                 unsigned long r2, unsigned long r3, unsigned long r4,
+                 unsigned long r5, unsigned long r6, struct pt_regs regs)
+{
+        struct rt_sigframe __user *frame = (struct rt_sigframe __user *)regs.spu;
+        sigset_t set;
+        stack_t st;
+        int result;
+
+        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, &result))
+                goto badframe;
+
+        if (__copy_from_user(&st, &frame->uc.uc_stack, sizeof(st)))
+                goto badframe;
+        /* It is more difficult to avoid calling this function than to
+           call it and ignore errors.  */
+        do_sigaltstack(&st, NULL, regs.spu);
+
+        return result;
+
+badframe:
+        force_sig(SIGSEGV, current);
+        return 0;
+}
+
+/*
+ * Set up a signal frame.
+ */
+
+static int
+setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs,
+                 unsigned long mask)
+{
+        int err = 0;
+
+#define COPY(x) err |= __put_user(regs->x, &sc->sc_##x)
+        COPY(r4);
+        COPY(r5);
+        COPY(r6);
+        COPY(pt_regs);
+        COPY(r0);
+        COPY(r1);
+        COPY(r2);
+        COPY(r3);
+        COPY(r7);
+        COPY(r8);
+        COPY(r9);
+        COPY(r10);
+        COPY(r11);
+        COPY(r12);
+#if defined(CONFIG_ISA_M32R2) && defined(CONFIG_ISA_DSP_LEVEL2)
+        COPY(acc0h);
+        COPY(acc0l);
+        COPY(acc1h);
+        COPY(acc1l);
+#elif defined(CONFIG_ISA_M32R2) || defined(CONFIG_ISA_M32R)
+        COPY(acch);
+        COPY(accl);
+#else
+#error unknown isa configuration
+#endif
+        COPY(psw);
+        COPY(bpc);
+        COPY(bbpsw);
+        COPY(bbpc);
+        COPY(spu);
+        COPY(fp);
+        COPY(lr);
+        COPY(spi);
+#undef COPY
+
+        err |= __put_user(mask, &sc->oldmask);
+
+        return err;
+}
+
+/*
+ * Determine which stack to use..
+ */
+static inline void __user *
+get_sigframe(struct k_sigaction *ka, unsigned long sp, size_t frame_size)
+{
+        /* 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;
+        }
+
+        return (void __user *)((sp - frame_size) & -8ul);
+}
+
+static void 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 err = 0;
+        int signal;
+
+        frame = get_sigframe(ka, regs->spu, sizeof(*frame));
+
+        if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
+                goto give_sigsegv;
+
+        signal = 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(signal, &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(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp);
+        err |= __put_user(sas_ss_flags(regs->spu),
+                          &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.  */
+        regs->lr = (unsigned long)ka->sa.sa_restorer;
+
+        /* Set up registers for signal handler */
+        regs->spu = (unsigned long)frame;
+        regs->r0 = signal;      /* Arg for signal handler */
+        regs->r1 = (unsigned long)&frame->info;
+        regs->r2 = (unsigned long)&frame->uc;
+        regs->bpc = (unsigned long)ka->sa.sa_handler;
+
+        set_fs(USER_DS);
+
+#if DEBUG_SIG
+        printk("SIG deliver (%s:%d): sp=%p pc=%p\n",
+                current->comm, current->pid, frame, regs->pc);
+#endif
+
+        return;
+
+give_sigsegv:
+        force_sigsegv(sig, current);
+}
+
+/*
+ * OK, we're invoking a handler
+ */
+
+static void
+handle_signal(unsigned long sig, struct k_sigaction *ka, siginfo_t *info,
+              sigset_t *oldset, struct pt_regs *regs)
+{
+        unsigned short inst;
+
+        /* Are we from a system call? */
+        if (regs->syscall_nr >= 0) {
+                /* If so, check system call restarting.. */
+                switch (regs->r0) {
+                        case -ERESTART_RESTARTBLOCK:
+                        case -ERESTARTNOHAND:
+                                regs->r0 = -EINTR;
+                                break;
+
+                        case -ERESTARTSYS:
+                                if (!(ka->sa.sa_flags & SA_RESTART)) {
+                                        regs->r0 = -EINTR;
+                                        break;
+                                }
+                        /* fallthrough */
+                        case -ERESTARTNOINTR:
+                                regs->r0 = regs->orig_r0;
+                                inst = *(unsigned short *)(regs->bpc - 2);
+                                if ((inst & 0xfff0) == 0x10f0)  /* trap ? */
+                                        regs->bpc -= 2;
+                                else
+                                        regs->bpc -= 4;
+                }
+        }
+
+        /* Set up the stack frame */
+        setup_rt_frame(sig, ka, info, 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.
+ */
+int do_signal(struct pt_regs *regs, sigset_t *oldset)
+{
+        siginfo_t info;
+        int signr;
+        struct k_sigaction ka;
+        unsigned short inst;
+
+        /*
+         * 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 (!user_mode(regs))
+                return 1;
+
+        if (current->flags & PF_FREEZE) {
+                refrigerator(0);
+                goto no_signal;
+        }
+
+        if (!oldset)
+                oldset = &current->blocked;
+
+        signr = get_signal_to_deliver(&info, &ka, regs, NULL);
+        if (signr > 0) {
+                /* Reenable any watchpoints before delivering the
+                 * signal to user space. The processor register will
+                 * have been cleared if the watchpoint triggered
+                 * inside the kernel.
+                 */
+
+                /* Whee!  Actually deliver the signal.  */
+                handle_signal(signr, &ka, &info, oldset, regs);
+                return 1;
+        }
+
+ no_signal:
+        /* Did we come from a system call? */
+        if (regs->syscall_nr >= 0) {
+                /* Restart the system call - no handlers present */
+                if (regs->r0 == -ERESTARTNOHAND ||
+                    regs->r0 == -ERESTARTSYS ||
+                    regs->r0 == -ERESTARTNOINTR) {
+                        regs->r0 = regs->orig_r0;
+                        inst = *(unsigned short *)(regs->bpc - 2);
+                        if ((inst & 0xfff0) == 0x10f0)  /* trap ? */
+                                regs->bpc -= 2;
+                        else
+                                regs->bpc -= 4;
+                }
+                if (regs->r0 == -ERESTART_RESTARTBLOCK){
+                        regs->r0 = regs->orig_r0;
+                        regs->r7 = __NR_restart_syscall;
+                        inst = *(unsigned short *)(regs->bpc - 2);
+                        if ((inst & 0xfff0) == 0x10f0)  /* trap ? */
+                                regs->bpc -= 2;
+                        else
+                                regs->bpc -= 4;
+                }
+        }
+        return 0;
+}
+
+/*
+ * notification of userspace execution resumption
+ * - triggered by current->work.notify_resume
+ */
+void do_notify_resume(struct pt_regs *regs, sigset_t *oldset,
+                      __u32 thread_info_flags)
+{
+        /* Pending single-step? */
+        if (thread_info_flags & _TIF_SINGLESTEP)
+                clear_thread_flag(TIF_SINGLESTEP);
+
+        /* deal with pending signal delivery */
+        if (thread_info_flags & _TIF_SIGPENDING)
+                do_signal(regs,oldset);
+
+        clear_thread_flag(TIF_IRET);
+}