1 files changed, 355 insertions, 0 deletions

diff --git a/arch/score/kernel/signal.c b/arch/score/kernel/signal.c
new file mode 100644
index 00000000000..b4ed1b3f807
--- /dev/null
+++ b/arch/score/kernel/signal.c
@@ -0,0 +1,355 @@
+/*
+ * arch/score/kernel/signal.c
+ *
+ * Score Processor version.
+ *
+ * Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
+ *  Chen Liqin <liqin.chen@sunplusct.com>
+ *  Lennox Wu <lennox.wu@sunplusct.com>
+ *
+ * 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; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see the file COPYING, or write
+ * to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#include <linux/errno.h>
+#include <linux/signal.h>
+#include <linux/unistd.h>
+#include <linux/uaccess.h>
+#include <asm-generic/ucontext.h>
+
+#include <asm/cacheflush.h>
+
+#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
+
+struct rt_sigframe {
+        u32 rs_ass[4];          /* argument save space */
+        u32 rs_code[2];         /* signal trampoline */
+        struct siginfo rs_info;
+        struct ucontext rs_uc;
+};
+
+int setup_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc)
+{
+        int err = 0;
+        unsigned long reg;
+
+        reg = regs->cp0_epc; err |= __put_user(reg, &sc->sc_pc);
+        err |= __put_user(regs->cp0_psr, &sc->sc_psr);
+        err |= __put_user(regs->cp0_condition, &sc->sc_condition);
+
+
+#define save_gp_reg(i) {                                \
+        reg = regs->regs[i];                            \
+        err |= __put_user(reg, &sc->sc_regs[i]);        \
+} while (0)
+        save_gp_reg(0); save_gp_reg(1); save_gp_reg(2);
+        save_gp_reg(3); save_gp_reg(4); save_gp_reg(5);
+        save_gp_reg(6); save_gp_reg(7); save_gp_reg(8);
+        save_gp_reg(9); save_gp_reg(10); save_gp_reg(11);
+        save_gp_reg(12); save_gp_reg(13); save_gp_reg(14);
+        save_gp_reg(15); save_gp_reg(16); save_gp_reg(17);
+        save_gp_reg(18); save_gp_reg(19); save_gp_reg(20);
+        save_gp_reg(21); save_gp_reg(22); save_gp_reg(23);
+        save_gp_reg(24); save_gp_reg(25); save_gp_reg(26);
+        save_gp_reg(27); save_gp_reg(28); save_gp_reg(29);
+#undef save_gp_reg
+
+        reg = regs->ceh; err |= __put_user(reg, &sc->sc_mdceh);
+        reg = regs->cel; err |= __put_user(reg, &sc->sc_mdcel);
+        err |= __put_user(regs->cp0_ecr, &sc->sc_ecr);
+        err |= __put_user(regs->cp0_ema, &sc->sc_ema);
+
+        return err;
+}
+
+int restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc)
+{
+        int err = 0;
+        u32 reg;
+
+        err |= __get_user(regs->cp0_epc, &sc->sc_pc);
+        err |= __get_user(regs->cp0_condition, &sc->sc_condition);
+
+        err |= __get_user(reg, &sc->sc_mdceh);
+        regs->ceh = (int) reg;
+        err |= __get_user(reg, &sc->sc_mdcel);
+        regs->cel = (int) reg;
+
+        err |= __get_user(reg, &sc->sc_psr);
+        regs->cp0_psr = (int) reg;
+        err |= __get_user(reg, &sc->sc_ecr);
+        regs->cp0_ecr = (int) reg;
+        err |= __get_user(reg, &sc->sc_ema);
+        regs->cp0_ema = (int) reg;
+
+#define restore_gp_reg(i) do {                          \
+        err |= __get_user(reg, &sc->sc_regs[i]);        \
+        regs->regs[i] = reg;                            \
+} while (0)
+        restore_gp_reg(0); restore_gp_reg(1); restore_gp_reg(2);
+        restore_gp_reg(3); restore_gp_reg(4); restore_gp_reg(5);
+        restore_gp_reg(6); restore_gp_reg(7); restore_gp_reg(8);
+        restore_gp_reg(9); restore_gp_reg(10); restore_gp_reg(11);
+        restore_gp_reg(12); restore_gp_reg(13); restore_gp_reg(14);
+        restore_gp_reg(15); restore_gp_reg(16); restore_gp_reg(17);
+        restore_gp_reg(18); restore_gp_reg(19); restore_gp_reg(20);
+        restore_gp_reg(21); restore_gp_reg(22); restore_gp_reg(23);
+        restore_gp_reg(24); restore_gp_reg(25); restore_gp_reg(26);
+        restore_gp_reg(27); restore_gp_reg(28); restore_gp_reg(29);
+#undef restore_gp_reg
+
+        return err;
+}
+
+/*
+ * Determine which stack to use..
+ */
+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->regs[0];
+        sp -= 32;
+
+        /* This is the X/Open sanctioned signal stack switching.  */
+        if ((ka->sa.sa_flags & SA_ONSTACK) && (!on_sig_stack(sp)))
+                sp = current->sas_ss_sp + current->sas_ss_size;
+
+        return (void *)((sp - frame_size) & ~7);
+}
+
+asmlinkage int score_sigaltstack(struct pt_regs *regs)
+{
+        const stack_t *uss = (const stack_t *) regs->regs[4];
+        stack_t *uoss = (stack_t *) regs->regs[5];
+        unsigned long usp = regs->regs[0];
+
+        return do_sigaltstack(uss, uoss, usp);
+}
+
+asmlinkage void score_rt_sigreturn(struct pt_regs *regs)
+{
+        struct rt_sigframe __user *frame;
+        sigset_t set;
+        stack_t st;
+        int sig;
+
+        frame = (struct rt_sigframe __user *) regs->regs[0];
+        if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
+                goto badframe;
+        if (__copy_from_user(&set, &frame->rs_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);
+
+        sig = restore_sigcontext(regs, &frame->rs_uc.uc_mcontext);
+        if (sig < 0)
+                goto badframe;
+        else if (sig)
+                force_sig(sig, current);
+
+        if (__copy_from_user(&st, &frame->rs_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((stack_t __user *)&st, NULL, regs->regs[0]);
+
+        __asm__ __volatile__(
+                "mv\tr0, %0\n\t"
+                "la\tr8, syscall_exit\n\t"
+                "br\tr8\n\t"
+                : : "r" (regs) : "r8");
+
+badframe:
+        force_sig(SIGSEGV, current);
+}
+
+int setup_rt_frame(struct k_sigaction *ka, struct pt_regs *regs,
+                int signr, sigset_t *set, siginfo_t *info)
+{
+        struct rt_sigframe *frame;
+        int err = 0;
+
+        frame = get_sigframe(ka, regs, sizeof(*frame));
+        if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
+                goto give_sigsegv;
+
+        /*
+         * Set up the return code ...
+         *
+         *         li      v0, __NR_rt_sigreturn
+         *         syscall
+         */
+        err |= __put_user(0x87788000 + __NR_rt_sigreturn*2,
+                        frame->rs_code + 0);
+        err |= __put_user(0x80008002, frame->rs_code + 1);
+        flush_cache_sigtramp((unsigned long) frame->rs_code);
+
+        err |= copy_siginfo_to_user(&frame->rs_info, info);
+        err |= __put_user(0, &frame->rs_uc.uc_flags);
+        err |= __put_user(0, &frame->rs_uc.uc_link);
+        err |= __put_user((void *)current->sas_ss_sp,
+                                &frame->rs_uc.uc_stack.ss_sp);
+        err |= __put_user(sas_ss_flags(regs->regs[0]),
+                                &frame->rs_uc.uc_stack.ss_flags);
+        err |= __put_user(current->sas_ss_size,
+                                &frame->rs_uc.uc_stack.ss_size);
+        err |= setup_sigcontext(regs, &frame->rs_uc.uc_mcontext);
+        err |= __copy_to_user(&frame->rs_uc.uc_sigmask, set, sizeof(*set));
+
+        if (err)
+                goto give_sigsegv;
+
+        regs->regs[0] = (unsigned long) frame;
+        regs->regs[3] = (unsigned long) frame->rs_code;
+        regs->regs[4] = signr;
+        regs->regs[5] = (unsigned long) &frame->rs_info;
+        regs->regs[6] = (unsigned long) &frame->rs_uc;
+        regs->regs[29] = (unsigned long) ka->sa.sa_handler;
+        regs->cp0_epc = (unsigned long) ka->sa.sa_handler;
+
+        return 0;
+
+give_sigsegv:
+        if (signr == SIGSEGV)
+                ka->sa.sa_handler = SIG_DFL;
+        force_sig(SIGSEGV, current);
+        return -EFAULT;
+}
+
+int handle_signal(unsigned long sig, siginfo_t *info,
+        struct k_sigaction *ka, sigset_t *oldset, struct pt_regs *regs)
+{
+        int ret;
+
+        if (regs->is_syscall) {
+                switch (regs->regs[4]) {
+                case ERESTART_RESTARTBLOCK:
+                case ERESTARTNOHAND:
+                        regs->regs[4] = EINTR;
+                        break;
+                case ERESTARTSYS:
+                        if (!(ka->sa.sa_flags & SA_RESTART)) {
+                                regs->regs[4] = EINTR;
+                                break;
+                        }
+                case ERESTARTNOINTR:
+                        regs->regs[4] = regs->orig_r4;
+                        regs->regs[7] = regs->orig_r7;
+                        regs->cp0_epc -= 8;
+                }
+
+                regs->is_syscall = 0;
+        }
+
+        /*
+         * Set up the stack frame
+         */
+        ret = setup_rt_frame(ka, regs, sig, oldset, info);
+
+        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;
+}
+
+asmlinkage void do_signal(struct pt_regs *regs)
+{
+        struct k_sigaction ka;
+        sigset_t *oldset;
+        siginfo_t info;
+        int signr;
+
+        /*
+         * 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;
+
+        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) {
+                /* 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 TIF_RESTORE_SIGMASK flag.
+                         */
+                        if (test_thread_flag(TIF_RESTORE_SIGMASK))
+                                clear_thread_flag(TIF_RESTORE_SIGMASK);
+                }
+
+                return;
+        }
+
+        if (regs->is_syscall) {
+                if (regs->regs[4] == ERESTARTNOHAND ||
+                    regs->regs[4] == ERESTARTSYS ||
+                    regs->regs[4] == ERESTARTNOINTR) {
+                        regs->regs[4] = regs->orig_r4;
+                        regs->regs[7] = regs->orig_r7;
+                        regs->cp0_epc -= 8;
+                }
+
+                if (regs->regs[4] == ERESTART_RESTARTBLOCK) {
+                        regs->regs[27] = __NR_restart_syscall;
+                        regs->regs[4] = regs->orig_r4;
+                        regs->regs[7] = regs->orig_r7;
+                        regs->cp0_epc -= 8;
+                }
+
+                regs->is_syscall = 0;   /* Don't deal with this again.  */
+        }
+
+        /*
+         * 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 the TIF_WORK_MASK flags
+ */
+asmlinkage void do_notify_resume(struct pt_regs *regs, void *unused,
+                                __u32 thread_info_flags)
+{
+        /* deal with pending signal delivery */
+        if (thread_info_flags & (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK))
+                do_signal(regs);
+}